Annotation of loncom/lond, revision 1.483

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network
                      3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60      www         4: #
1.483   ! www         5: # $Id: lond,v 1.482 2011/10/24 20:43:51 www Exp $
1.60      www         6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
1.167     foxr       13: # the Free Software Foundation; either version 2 of the License, or 
1.60      www        14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
1.469     foxr       18: 
1.60      www        19: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     20: # GNU General Public License for more details.
                     21: #
                     22: # You should have received a copy of the GNU General Public License
                     23: # along with LON-CAPA; if not, write to the Free Software
1.178     foxr       24: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
1.60      www        25: #
                     26: # /home/httpd/html/adm/gpl.txt
                     27: #
1.161     foxr       28: 
                     29: 
1.60      www        30: # http://www.lon-capa.org/
                     31: #
1.54      harris41   32: 
1.134     albertel   33: use strict;
1.80      harris41   34: use lib '/home/httpd/lib/perl/';
1.325     albertel   35: use LONCAPA;
1.80      harris41   36: use LONCAPA::Configuration;
                     37: 
1.1       albertel   38: use IO::Socket;
                     39: use IO::File;
1.126     albertel   40: #use Apache::File;
1.1       albertel   41: use POSIX;
                     42: use Crypt::IDEA;
                     43: use LWP::UserAgent();
1.347     raeburn    44: use Digest::MD5 qw(md5_hex);
1.3       www        45: use GDBM_File;
1.91      albertel   46: use Authen::Krb5;
1.49      albertel   47: use localauth;
1.193     raeburn    48: use localenroll;
1.265     albertel   49: use localstudentphoto;
1.143     foxr       50: use File::Copy;
1.292     albertel   51: use File::Find;
1.200     matthew    52: use LONCAPA::lonlocal;
                     53: use LONCAPA::lonssl;
1.221     albertel   54: use Fcntl qw(:flock);
1.383     raeburn    55: use Apache::lonnet;
1.472     raeburn    56: use Mail::Send;
1.1       albertel   57: 
1.463     foxr       58: my $DEBUG = 0;		       # Non zero to enable debug log entries.
1.77      foxr       59: 
1.57      www        60: my $status='';
                     61: my $lastlog='';
                     62: 
1.483   ! www        63: my $VERSION='$Revision: 1.482 $'; #' stupid emacs
1.121     albertel   64: my $remoteVERSION;
1.214     foxr       65: my $currenthostid="default";
1.115     albertel   66: my $currentdomainid;
1.134     albertel   67: 
                     68: my $client;
1.200     matthew    69: my $clientip;			# IP address of client.
                     70: my $clientname;			# LonCAPA name of client.
1.448     raeburn    71: my $clientversion;              # LonCAPA version running on client.
                     72: my $clienthomedom;              # LonCAPA domain of homeID for client. 
                     73:                                 # primary library server. 
1.140     foxr       74: 
1.134     albertel   75: my $server;
1.200     matthew    76: 
                     77: my $keymode;
1.198     foxr       78: 
1.207     foxr       79: my $cipher;			# Cipher key negotiated with client
                     80: my $tmpsnum = 0;		# Id of tmpputs.
                     81: 
1.178     foxr       82: # 
                     83: #   Connection type is:
                     84: #      client                   - All client actions are allowed
                     85: #      manager                  - only management functions allowed.
                     86: #      both                     - Both management and client actions are allowed
                     87: #
1.161     foxr       88: 
1.178     foxr       89: my $ConnectionType;
1.161     foxr       90: 
1.178     foxr       91: my %managers;			# Ip -> manager names
1.161     foxr       92: 
1.178     foxr       93: my %perlvar;			# Will have the apache conf defined perl vars.
1.134     albertel   94: 
1.480     raeburn    95: my $dist;
                     96: 
1.178     foxr       97: #
1.207     foxr       98: #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
                     99: #    Each element of the hash contains a reference to an array that contains:
                    100: #          A reference to a sub that executes the request corresponding to the keyword.
                    101: #          A flag that is true if the request must be encoded to be acceptable.
                    102: #          A mask with bits as follows:
                    103: #                      CLIENT_OK    - Set when the function is allowed by ordinary clients
                    104: #                      MANAGER_OK   - Set when the function is allowed to manager clients.
                    105: #
                    106: my $CLIENT_OK  = 1;
                    107: my $MANAGER_OK = 2;
                    108: my %Dispatcher;
                    109: 
                    110: 
                    111: #
1.178     foxr      112: #  The array below are password error strings."
                    113: #
                    114: my $lastpwderror    = 13;		# Largest error number from lcpasswd.
                    115: my @passwderrors = ("ok",
1.287     foxr      116: 		   "pwchange_failure - lcpasswd must be run as user 'www'",
                    117: 		   "pwchange_failure - lcpasswd got incorrect number of arguments",
                    118: 		   "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
                    119: 		   "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
                    120: 		   "pwchange_failure - lcpasswd User does not exist.",
                    121: 		   "pwchange_failure - lcpasswd Incorrect current passwd",
                    122: 		   "pwchange_failure - lcpasswd Unable to su to root.",
                    123: 		   "pwchange_failure - lcpasswd Cannot set new passwd.",
                    124: 		   "pwchange_failure - lcpasswd Username has invalid characters",
                    125: 		   "pwchange_failure - lcpasswd Invalid characters in password",
                    126: 		   "pwchange_failure - lcpasswd User already exists", 
                    127:                    "pwchange_failure - lcpasswd Something went wrong with user addition.",
                    128: 		   "pwchange_failure - lcpasswd Password mismatch",
                    129: 		   "pwchange_failure - lcpasswd Error filename is invalid");
1.97      foxr      130: 
                    131: 
1.178     foxr      132: #  The array below are lcuseradd error strings.:
1.97      foxr      133: 
1.178     foxr      134: my $lastadderror = 13;
                    135: my @adderrors    = ("ok",
                    136: 		    "User ID mismatch, lcuseradd must run as user www",
                    137: 		    "lcuseradd Incorrect number of command line parameters must be 3",
                    138: 		    "lcuseradd Incorrect number of stdinput lines, must be 3",
                    139: 		    "lcuseradd Too many other simultaneous pwd changes in progress",
                    140: 		    "lcuseradd User does not exist",
                    141: 		    "lcuseradd Unable to make www member of users's group",
                    142: 		    "lcuseradd Unable to su to root",
                    143: 		    "lcuseradd Unable to set password",
1.377     albertel  144: 		    "lcuseradd Username has invalid characters",
1.178     foxr      145: 		    "lcuseradd Password has an invalid character",
                    146: 		    "lcuseradd User already exists",
                    147: 		    "lcuseradd Could not add user.",
                    148: 		    "lcuseradd Password mismatch");
1.97      foxr      149: 
1.96      foxr      150: 
1.412     foxr      151: # This array are the errors from lcinstallfile:
                    152: 
                    153: my @installerrors = ("ok",
                    154: 		     "Initial user id of client not that of www",
                    155: 		     "Usage error, not enough command line arguments",
                    156: 		     "Source file name does not exist",
                    157: 		     "Destination file name does not exist",
                    158: 		     "Some file operation failed",
                    159: 		     "Invalid table filename."
                    160: 		     );
1.207     foxr      161: 
                    162: #
                    163: #   Statistics that are maintained and dislayed in the status line.
                    164: #
1.212     foxr      165: my $Transactions = 0;		# Number of attempted transactions.
                    166: my $Failures     = 0;		# Number of transcations failed.
1.207     foxr      167: 
                    168: #   ResetStatistics: 
                    169: #      Resets the statistics counters:
                    170: #
                    171: sub ResetStatistics {
                    172:     $Transactions = 0;
                    173:     $Failures     = 0;
                    174: }
                    175: 
1.200     matthew   176: #------------------------------------------------------------------------
                    177: #
                    178: #   LocalConnection
                    179: #     Completes the formation of a locally authenticated connection.
                    180: #     This function will ensure that the 'remote' client is really the
                    181: #     local host.  If not, the connection is closed, and the function fails.
                    182: #     If so, initcmd is parsed for the name of a file containing the
                    183: #     IDEA session key.  The fie is opened, read, deleted and the session
                    184: #     key returned to the caller.
                    185: #
                    186: # Parameters:
                    187: #   $Socket      - Socket open on client.
                    188: #   $initcmd     - The full text of the init command.
                    189: #
                    190: # Returns:
                    191: #     IDEA session key on success.
                    192: #     undef on failure.
                    193: #
                    194: sub LocalConnection {
                    195:     my ($Socket, $initcmd) = @_;
1.373     albertel  196:     Debug("Attempting local connection: $initcmd client: $clientip");
1.277     albertel  197:     if($clientip ne "127.0.0.1") {
1.200     matthew   198: 	&logthis('<font color="red"> LocalConnection rejecting non local: '
1.373     albertel  199: 		 ."$clientip ne 127.0.0.1 </font>");
1.200     matthew   200: 	close $Socket;
                    201: 	return undef;
1.224     foxr      202:     }  else {
1.200     matthew   203: 	chomp($initcmd);	# Get rid of \n in filename.
                    204: 	my ($init, $type, $name) = split(/:/, $initcmd);
                    205: 	Debug(" Init command: $init $type $name ");
                    206: 
                    207: 	# Require that $init = init, and $type = local:  Otherwise
                    208: 	# the caller is insane:
                    209: 
                    210: 	if(($init ne "init") && ($type ne "local")) {
                    211: 	    &logthis('<font color = "red"> LocalConnection: caller is insane! '
                    212: 		     ."init = $init, and type = $type </font>");
                    213: 	    close($Socket);;
                    214: 	    return undef;
                    215: 		
                    216: 	}
                    217: 	#  Now get the key filename:
                    218: 
                    219: 	my $IDEAKey = lonlocal::ReadKeyFile($name);
                    220: 	return $IDEAKey;
                    221:     }
                    222: }
                    223: #------------------------------------------------------------------------------
                    224: #
                    225: #  SSLConnection
                    226: #   Completes the formation of an ssh authenticated connection. The
                    227: #   socket is promoted to an ssl socket.  If this promotion and the associated
                    228: #   certificate exchange are successful, the IDEA key is generated and sent
                    229: #   to the remote peer via the SSL tunnel. The IDEA key is also returned to
                    230: #   the caller after the SSL tunnel is torn down.
                    231: #
                    232: # Parameters:
                    233: #   Name              Type             Purpose
                    234: #   $Socket          IO::Socket::INET  Plaintext socket.
                    235: #
                    236: # Returns:
                    237: #    IDEA key on success.
                    238: #    undef on failure.
                    239: #
                    240: sub SSLConnection {
                    241:     my $Socket   = shift;
                    242: 
                    243:     Debug("SSLConnection: ");
                    244:     my $KeyFile         = lonssl::KeyFile();
                    245:     if(!$KeyFile) {
                    246: 	my $err = lonssl::LastError();
                    247: 	&logthis("<font color=\"red\"> CRITICAL"
                    248: 		 ."Can't get key file $err </font>");
                    249: 	return undef;
                    250:     }
                    251:     my ($CACertificate,
                    252: 	$Certificate) = lonssl::CertificateFile();
                    253: 
                    254: 
                    255:     # If any of the key, certificate or certificate authority 
                    256:     # certificate filenames are not defined, this can't work.
                    257: 
                    258:     if((!$Certificate) || (!$CACertificate)) {
                    259: 	my $err = lonssl::LastError();
                    260: 	&logthis("<font color=\"red\"> CRITICAL"
                    261: 		 ."Can't get certificates: $err </font>");
                    262: 
                    263: 	return undef;
                    264:     }
                    265:     Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
                    266: 
                    267:     # Indicate to our peer that we can procede with
                    268:     # a transition to ssl authentication:
                    269: 
                    270:     print $Socket "ok:ssl\n";
                    271: 
                    272:     Debug("Approving promotion -> ssl");
                    273:     #  And do so:
                    274: 
                    275:     my $SSLSocket = lonssl::PromoteServerSocket($Socket,
                    276: 						$CACertificate,
                    277: 						$Certificate,
                    278: 						$KeyFile);
                    279:     if(! ($SSLSocket) ) {	# SSL socket promotion failed.
                    280: 	my $err = lonssl::LastError();
                    281: 	&logthis("<font color=\"red\"> CRITICAL "
                    282: 		 ."SSL Socket promotion failed: $err </font>");
                    283: 	return undef;
                    284:     }
                    285:     Debug("SSL Promotion successful");
                    286: 
                    287:     # 
                    288:     #  The only thing we'll use the socket for is to send the IDEA key
                    289:     #  to the peer:
                    290: 
                    291:     my $Key = lonlocal::CreateCipherKey();
                    292:     print $SSLSocket "$Key\n";
                    293: 
                    294:     lonssl::Close($SSLSocket); 
                    295: 
                    296:     Debug("Key exchange complete: $Key");
                    297: 
                    298:     return $Key;
                    299: }
                    300: #
                    301: #     InsecureConnection: 
                    302: #        If insecure connections are allowd,
                    303: #        exchange a challenge with the client to 'validate' the
                    304: #        client (not really, but that's the protocol):
                    305: #        We produce a challenge string that's sent to the client.
                    306: #        The client must then echo the challenge verbatim to us.
                    307: #
                    308: #  Parameter:
                    309: #      Socket      - Socket open on the client.
                    310: #  Returns:
                    311: #      1           - success.
                    312: #      0           - failure (e.g.mismatch or insecure not allowed).
                    313: #
                    314: sub InsecureConnection {
                    315:     my $Socket  =  shift;
                    316: 
                    317:     #   Don't even start if insecure connections are not allowed.
                    318: 
                    319:     if(! $perlvar{londAllowInsecure}) {	# Insecure connections not allowed.
                    320: 	return 0;
                    321:     }
                    322: 
                    323:     #   Fabricate a challenge string and send it..
                    324: 
                    325:     my $challenge = "$$".time;	# pid + time.
                    326:     print $Socket "$challenge\n";
                    327:     &status("Waiting for challenge reply");
                    328: 
                    329:     my $answer = <$Socket>;
                    330:     $answer    =~s/\W//g;
                    331:     if($challenge eq $answer) {
                    332: 	return 1;
1.224     foxr      333:     } else {
1.200     matthew   334: 	logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
                    335: 	&status("No challenge reqply");
                    336: 	return 0;
                    337:     }
                    338:     
                    339: 
                    340: }
1.251     foxr      341: #
                    342: #   Safely execute a command (as long as it's not a shel command and doesn
                    343: #   not require/rely on shell escapes.   The function operates by doing a
                    344: #   a pipe based fork and capturing stdout and stderr  from the pipe.
                    345: #
                    346: # Formal Parameters:
                    347: #     $line                    - A line of text to be executed as a command.
                    348: # Returns:
                    349: #     The output from that command.  If the output is multiline the caller
                    350: #     must know how to split up the output.
                    351: #
                    352: #
                    353: sub execute_command {
                    354:     my ($line)    = @_;
                    355:     my @words     = split(/\s/, $line);	# Bust the command up into words.
                    356:     my $output    = "";
                    357: 
                    358:     my $pid = open(CHILD, "-|");
                    359:     
                    360:     if($pid) {			# Parent process
                    361: 	Debug("In parent process for execute_command");
                    362: 	my @data = <CHILD>;	# Read the child's outupt...
                    363: 	close CHILD;
                    364: 	foreach my $output_line (@data) {
                    365: 	    Debug("Adding $output_line");
                    366: 	    $output .= $output_line; # Presumably has a \n on it.
                    367: 	}
                    368: 
                    369:     } else {			# Child process
                    370: 	close (STDERR);
                    371: 	open  (STDERR, ">&STDOUT");# Combine stderr, and stdout...
                    372: 	exec(@words);		# won't return.
                    373:     }
                    374:     return $output;
                    375: }
                    376: 
1.200     matthew   377: 
1.140     foxr      378: #   GetCertificate: Given a transaction that requires a certificate,
                    379: #   this function will extract the certificate from the transaction
                    380: #   request.  Note that at this point, the only concept of a certificate
                    381: #   is the hostname to which we are connected.
                    382: #
                    383: #   Parameter:
                    384: #      request   - The request sent by our client (this parameterization may
                    385: #                  need to change when we really use a certificate granting
                    386: #                  authority.
                    387: #
                    388: sub GetCertificate {
                    389:     my $request = shift;
                    390: 
                    391:     return $clientip;
                    392: }
1.161     foxr      393: 
1.178     foxr      394: #
                    395: #   Return true if client is a manager.
                    396: #
                    397: sub isManager {
                    398:     return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
                    399: }
                    400: #
                    401: #   Return tru if client can do client functions
                    402: #
                    403: sub isClient {
                    404:     return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
                    405: }
1.161     foxr      406: 
                    407: 
1.156     foxr      408: #
                    409: #   ReadManagerTable: Reads in the current manager table. For now this is
                    410: #                     done on each manager authentication because:
                    411: #                     - These authentications are not frequent
                    412: #                     - This allows dynamic changes to the manager table
                    413: #                       without the need to signal to the lond.
                    414: #
                    415: sub ReadManagerTable {
                    416: 
1.412     foxr      417:     &Debug("Reading manager table");
1.156     foxr      418:     #   Clean out the old table first..
                    419: 
1.166     foxr      420:    foreach my $key (keys %managers) {
                    421:       delete $managers{$key};
                    422:    }
                    423: 
                    424:    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
                    425:    if (!open (MANAGERS, $tablename)) {
1.473     raeburn   426:        my $hostname = &Apache::lonnet::hostname($perlvar{'lonHostID'});
                    427:        if (&Apache::lonnet::is_LC_dns($hostname)) {
1.472     raeburn   428:            &logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
                    429:        }
                    430:        return;
1.166     foxr      431:    }
                    432:    while(my $host = <MANAGERS>) {
                    433:       chomp($host);
                    434:       if ($host =~ "^#") {                  # Comment line.
                    435:          next;
                    436:       }
1.368     albertel  437:       if (!defined &Apache::lonnet::get_host_ip($host)) { # This is a non cluster member
1.161     foxr      438: 	    #  The entry is of the form:
                    439: 	    #    cluname:hostname
                    440: 	    #  cluname - A 'cluster hostname' is needed in order to negotiate
                    441: 	    #            the host key.
                    442: 	    #  hostname- The dns name of the host.
                    443: 	    #
1.166     foxr      444:           my($cluname, $dnsname) = split(/:/, $host);
                    445:           
                    446:           my $ip = gethostbyname($dnsname);
                    447:           if(defined($ip)) {                 # bad names don't deserve entry.
                    448:             my $hostip = inet_ntoa($ip);
                    449:             $managers{$hostip} = $cluname;
                    450:             logthis('<font color="green"> registering manager '.
                    451:                     "$dnsname as $cluname with $hostip </font>\n");
                    452:          }
                    453:       } else {
                    454:          logthis('<font color="green"> existing host'." $host</font>\n");
1.472     raeburn   455:          $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if cluster memeber
1.166     foxr      456:       }
                    457:    }
1.156     foxr      458: }
1.140     foxr      459: 
                    460: #
                    461: #  ValidManager: Determines if a given certificate represents a valid manager.
                    462: #                in this primitive implementation, the 'certificate' is
                    463: #                just the connecting loncapa client name.  This is checked
                    464: #                against a valid client list in the configuration.
                    465: #
                    466: #                  
                    467: sub ValidManager {
                    468:     my $certificate = shift; 
                    469: 
1.163     foxr      470:     return isManager;
1.140     foxr      471: }
                    472: #
1.143     foxr      473: #  CopyFile:  Called as part of the process of installing a 
                    474: #             new configuration file.  This function copies an existing
                    475: #             file to a backup file.
                    476: # Parameters:
                    477: #     oldfile  - Name of the file to backup.
                    478: #     newfile  - Name of the backup file.
                    479: # Return:
                    480: #     0   - Failure (errno has failure reason).
                    481: #     1   - Success.
                    482: #
                    483: sub CopyFile {
1.192     foxr      484: 
                    485:     my ($oldfile, $newfile) = @_;
1.143     foxr      486: 
1.281     matthew   487:     if (! copy($oldfile,$newfile)) {
                    488:         return 0;
1.143     foxr      489:     }
1.281     matthew   490:     chmod(0660, $newfile);
                    491:     return 1;
1.143     foxr      492: }
1.157     foxr      493: #
                    494: #  Host files are passed out with externally visible host IPs.
                    495: #  If, for example, we are behind a fire-wall or NAT host, our 
                    496: #  internally visible IP may be different than the externally
                    497: #  visible IP.  Therefore, we always adjust the contents of the
                    498: #  host file so that the entry for ME is the IP that we believe
                    499: #  we have.  At present, this is defined as the entry that
                    500: #  DNS has for us.  If by some chance we are not able to get a
                    501: #  DNS translation for us, then we assume that the host.tab file
                    502: #  is correct.  
                    503: #    BUGBUGBUG - in the future, we really should see if we can
                    504: #       easily query the interface(s) instead.
                    505: # Parameter(s):
                    506: #     contents    - The contents of the host.tab to check.
                    507: # Returns:
                    508: #     newcontents - The adjusted contents.
                    509: #
                    510: #
                    511: sub AdjustHostContents {
                    512:     my $contents  = shift;
                    513:     my $adjusted;
                    514:     my $me        = $perlvar{'lonHostID'};
                    515: 
1.354     albertel  516:     foreach my $line (split(/\n/,$contents)) {
1.472     raeburn   517: 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/) ||
                    518:              ($line =~ /^\s*\^/))) {
1.157     foxr      519: 	    chomp($line);
                    520: 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
                    521: 	    if ($id eq $me) {
1.354     albertel  522: 		my $ip = gethostbyname($name);
                    523: 		my $ipnew = inet_ntoa($ip);
                    524: 		$ip = $ipnew;
1.157     foxr      525: 		#  Reconstruct the host line and append to adjusted:
                    526: 		
1.354     albertel  527: 		my $newline = "$id:$domain:$role:$name:$ip";
                    528: 		if($maxcon ne "") { # Not all hosts have loncnew tuning params
                    529: 		    $newline .= ":$maxcon:$idleto:$mincon";
                    530: 		}
                    531: 		$adjusted .= $newline."\n";
1.157     foxr      532: 		
1.354     albertel  533: 	    } else {		# Not me, pass unmodified.
                    534: 		$adjusted .= $line."\n";
                    535: 	    }
1.157     foxr      536: 	} else {                  # Blank or comment never re-written.
                    537: 	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
                    538: 	}
1.354     albertel  539:     }
                    540:     return $adjusted;
1.157     foxr      541: }
1.143     foxr      542: #
                    543: #   InstallFile: Called to install an administrative file:
1.412     foxr      544: #       - The file is created int a temp directory called <name>.tmp
                    545: #       - lcinstall file is called to install the file.
                    546: #         since the web app has no direct write access to the table directory
1.143     foxr      547: #
                    548: #  Parameters:
                    549: #       Name of the file
                    550: #       File Contents.
                    551: #  Return:
                    552: #      nonzero - success.
                    553: #      0       - failure and $! has an errno.
1.412     foxr      554: # Assumptions:
                    555: #    File installtion is a relatively infrequent
1.143     foxr      556: #
                    557: sub InstallFile {
1.192     foxr      558: 
                    559:     my ($Filename, $Contents) = @_;
1.412     foxr      560: #     my $TempFile = $Filename.".tmp";
                    561:     my $exedir = $perlvar{'lonDaemons'};
                    562:     my $tmpdir = $exedir.'/tmp/';
                    563:     my $TempFile = $tmpdir."TempTableFile.tmp";
1.143     foxr      564: 
                    565:     #  Open the file for write:
                    566: 
                    567:     my $fh = IO::File->new("> $TempFile"); # Write to temp.
                    568:     if(!(defined $fh)) {
                    569: 	&logthis('<font color="red"> Unable to create '.$TempFile."</font>");
                    570: 	return 0;
                    571:     }
                    572:     #  write the contents of the file:
                    573: 
                    574:     print $fh ($Contents); 
                    575:     $fh->close;			# In case we ever have a filesystem w. locking
                    576: 
1.412     foxr      577:     chmod(0664, $TempFile);	# Everyone can write it.
                    578: 
                    579:     # Use lcinstall file to put the file in the table directory...
                    580: 
                    581:     &Debug("Opening pipe to $exedir/lcinstallfile $TempFile $Filename");
                    582:     my $pf = IO::File->new("| $exedir/lcinstallfile   $TempFile $Filename > $exedir/logs/lcinstallfile.log");
                    583:     close $pf;
                    584:     my $err = $?;
                    585:     &Debug("Status is $err");
                    586:     if ($err != 0) {
                    587: 	my $msg = $err;
                    588: 	if ($err < @installerrors) {
                    589: 	    $msg = $installerrors[$err];
                    590: 	}
                    591: 	&logthis("Install failed for table file $Filename : $msg");
                    592: 	return 0;
                    593:     }
                    594: 
                    595:     # Remove the temp file:
1.143     foxr      596: 
1.412     foxr      597:     unlink($TempFile);
1.143     foxr      598: 
                    599:     return 1;
                    600: }
1.200     matthew   601: 
                    602: 
1.169     foxr      603: #
                    604: #   ConfigFileFromSelector: converts a configuration file selector
1.411     foxr      605: #                 into a configuration file pathname.
1.472     raeburn   606: #                 Supports the following file selectors: 
                    607: #                 hosts, domain, dns_hosts, dns_domain  
1.411     foxr      608: #
1.169     foxr      609: #
                    610: #  Parameters:
                    611: #      selector  - Configuration file selector.
                    612: #  Returns:
                    613: #      Full path to the file or undef if the selector is invalid.
                    614: #
                    615: sub ConfigFileFromSelector {
                    616:     my $selector   = shift;
                    617:     my $tablefile;
                    618: 
                    619:     my $tabledir = $perlvar{'lonTabDir'}.'/';
1.472     raeburn   620:     if (($selector eq "hosts") || ($selector eq "domain") || 
                    621:         ($selector eq "dns_hosts") || ($selector eq "dns_domain")) {
1.411     foxr      622: 	$tablefile =  $tabledir.$selector.'.tab';
1.169     foxr      623:     }
                    624:     return $tablefile;
                    625: }
1.143     foxr      626: #
1.141     foxr      627: #   PushFile:  Called to do an administrative push of a file.
                    628: #              - Ensure the file being pushed is one we support.
                    629: #              - Backup the old file to <filename.saved>
                    630: #              - Separate the contents of the new file out from the
                    631: #                rest of the request.
                    632: #              - Write the new file.
                    633: #  Parameter:
                    634: #     Request - The entire user request.  This consists of a : separated
                    635: #               string pushfile:tablename:contents.
                    636: #     NOTE:  The contents may have :'s in it as well making things a bit
                    637: #            more interesting... but not much.
                    638: #  Returns:
                    639: #     String to send to client ("ok" or "refused" if bad file).
                    640: #
                    641: sub PushFile {
                    642:     my $request = shift;    
                    643:     my ($command, $filename, $contents) = split(":", $request, 3);
1.412     foxr      644:     &Debug("PushFile");
1.141     foxr      645:     
                    646:     #  At this point in time, pushes for only the following tables are
                    647:     #  supported:
                    648:     #   hosts.tab  ($filename eq host).
                    649:     #   domain.tab ($filename eq domain).
1.472     raeburn   650:     #   dns_hosts.tab ($filename eq dns_host).
                    651:     #   dns_domain.tab ($filename eq dns_domain). 
1.141     foxr      652:     # Construct the destination filename or reject the request.
                    653:     #
                    654:     # lonManage is supposed to ensure this, however this session could be
                    655:     # part of some elaborate spoof that managed somehow to authenticate.
                    656:     #
                    657: 
1.169     foxr      658: 
                    659:     my $tablefile = ConfigFileFromSelector($filename);
                    660:     if(! (defined $tablefile)) {
1.141     foxr      661: 	return "refused";
                    662:     }
1.412     foxr      663: 
1.157     foxr      664:     #  If the file being pushed is the host file, we adjust the entry for ourself so that the
                    665:     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
                    666:     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
                    667:     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
                    668:     #  that possibilty.
                    669: 
                    670:     if($filename eq "host") {
                    671: 	$contents = AdjustHostContents($contents);
                    672:     }
                    673: 
1.141     foxr      674:     #  Install the new file:
                    675: 
1.412     foxr      676:     &logthis("Installing new $tablefile contents:\n$contents");
1.143     foxr      677:     if(!InstallFile($tablefile, $contents)) {
                    678: 	&logthis('<font color="red"> Pushfile: unable to install '
1.145     foxr      679: 	 .$tablefile." $! </font>");
1.143     foxr      680: 	return "error:$!";
1.224     foxr      681:     } else {
1.143     foxr      682: 	&logthis('<font color="green"> Installed new '.$tablefile
1.473     raeburn   683: 		 ." - transaction by: $clientname ($clientip)</font>");
1.472     raeburn   684:         my $adminmail = $perlvar{'lonAdmEMail'};
                    685:         my $admindom = &Apache::lonnet::host_domain($perlvar{'lonHostID'});
                    686:         if ($admindom ne '') {
                    687:             my %domconfig =
                    688:                 &Apache::lonnet::get_dom('configuration',['contacts'],$admindom);
                    689:             if (ref($domconfig{'contacts'}) eq 'HASH') {
                    690:                 if ($domconfig{'contacts'}{'adminemail'} ne '') {
                    691:                     $adminmail = $domconfig{'contacts'}{'adminemail'};
                    692:                 }
                    693:             }
                    694:         }
                    695:         if ($adminmail =~ /^[^\@]+\@[^\@]+$/) {
                    696:             my $msg = new Mail::Send;
                    697:             $msg->to($adminmail);
                    698:             $msg->subject('LON-CAPA DNS update on '.$perlvar{'lonHostID'});
                    699:             $msg->add('Content-type','text/plain; charset=UTF-8');
                    700:             if (my $fh = $msg->open()) {
                    701:                 print $fh 'Update to '.$tablefile.' from Cluster Manager '.
1.473     raeburn   702:                           "$clientname ($clientip)\n";
1.472     raeburn   703:                 $fh->close;
                    704:             }
                    705:         }
1.143     foxr      706:     }
                    707: 
1.141     foxr      708:     #  Indicate success:
                    709:  
                    710:     return "ok";
                    711: 
                    712: }
1.145     foxr      713: 
                    714: #
                    715: #  Called to re-init either lonc or lond.
                    716: #
                    717: #  Parameters:
                    718: #    request   - The full request by the client.  This is of the form
                    719: #                reinit:<process>  
                    720: #                where <process> is allowed to be either of 
                    721: #                lonc or lond
                    722: #
                    723: #  Returns:
                    724: #     The string to be sent back to the client either:
                    725: #   ok         - Everything worked just fine.
                    726: #   error:why  - There was a failure and why describes the reason.
                    727: #
                    728: #
                    729: sub ReinitProcess {
                    730:     my $request = shift;
                    731: 
1.146     foxr      732: 
                    733:     # separate the request (reinit) from the process identifier and
                    734:     # validate it producing the name of the .pid file for the process.
                    735:     #
                    736:     #
                    737:     my ($junk, $process) = split(":", $request);
1.147     foxr      738:     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146     foxr      739:     if($process eq 'lonc') {
                    740: 	$processpidfile = $processpidfile."lonc.pid";
1.147     foxr      741: 	if (!open(PIDFILE, "< $processpidfile")) {
                    742: 	    return "error:Open failed for $processpidfile";
                    743: 	}
                    744: 	my $loncpid = <PIDFILE>;
                    745: 	close(PIDFILE);
                    746: 	logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
                    747: 		."</font>");
                    748: 	kill("USR2", $loncpid);
1.146     foxr      749:     } elsif ($process eq 'lond') {
1.147     foxr      750: 	logthis('<font color="red"> Reinitializing self (lond) </font>');
                    751: 	&UpdateHosts;			# Lond is us!!
1.146     foxr      752:     } else {
                    753: 	&logthis('<font color="yellow" Invalid reinit request for '.$process
                    754: 		 ."</font>");
                    755: 	return "error:Invalid process identifier $process";
                    756:     }
1.145     foxr      757:     return 'ok';
                    758: }
1.168     foxr      759: #   Validate a line in a configuration file edit script:
                    760: #   Validation includes:
                    761: #     - Ensuring the command is valid.
                    762: #     - Ensuring the command has sufficient parameters
                    763: #   Parameters:
                    764: #     scriptline - A line to validate (\n has been stripped for what it's worth).
1.167     foxr      765: #
1.168     foxr      766: #   Return:
                    767: #      0     - Invalid scriptline.
                    768: #      1     - Valid scriptline
                    769: #  NOTE:
                    770: #     Only the command syntax is checked, not the executability of the
                    771: #     command.
                    772: #
                    773: sub isValidEditCommand {
                    774:     my $scriptline = shift;
                    775: 
                    776:     #   Line elements are pipe separated:
                    777: 
                    778:     my ($command, $key, $newline)  = split(/\|/, $scriptline);
                    779:     &logthis('<font color="green"> isValideditCommand checking: '.
                    780: 	     "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
                    781:     
                    782:     if ($command eq "delete") {
                    783: 	#
                    784: 	#   key with no newline.
                    785: 	#
                    786: 	if( ($key eq "") || ($newline ne "")) {
                    787: 	    return 0;		# Must have key but no newline.
                    788: 	} else {
                    789: 	    return 1;		# Valid syntax.
                    790: 	}
1.169     foxr      791:     } elsif ($command eq "replace") {
1.168     foxr      792: 	#
                    793: 	#   key and newline:
                    794: 	#
                    795: 	if (($key eq "") || ($newline eq "")) {
                    796: 	    return 0;
                    797: 	} else {
                    798: 	    return 1;
                    799: 	}
1.169     foxr      800:     } elsif ($command eq "append") {
                    801: 	if (($key ne "") && ($newline eq "")) {
                    802: 	    return 1;
                    803: 	} else {
                    804: 	    return 0;
                    805: 	}
1.168     foxr      806:     } else {
                    807: 	return 0;		# Invalid command.
                    808:     }
                    809:     return 0;			# Should not get here!!!
                    810: }
1.169     foxr      811: #
                    812: #   ApplyEdit - Applies an edit command to a line in a configuration 
                    813: #               file.  It is the caller's responsiblity to validate the
                    814: #               edit line.
                    815: #   Parameters:
                    816: #      $directive - A single edit directive to apply.  
                    817: #                   Edit directives are of the form:
                    818: #                  append|newline      - Appends a new line to the file.
                    819: #                  replace|key|newline - Replaces the line with key value 'key'
                    820: #                  delete|key          - Deletes the line with key value 'key'.
                    821: #      $editor   - A config file editor object that contains the
                    822: #                  file being edited.
                    823: #
                    824: sub ApplyEdit {
1.192     foxr      825: 
                    826:     my ($directive, $editor) = @_;
1.169     foxr      827: 
                    828:     # Break the directive down into its command and its parameters
                    829:     # (at most two at this point.  The meaning of the parameters, if in fact
                    830:     #  they exist depends on the command).
                    831: 
                    832:     my ($command, $p1, $p2) = split(/\|/, $directive);
                    833: 
                    834:     if($command eq "append") {
                    835: 	$editor->Append($p1);	          # p1 - key p2 null.
                    836:     } elsif ($command eq "replace") {
                    837: 	$editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.
                    838:     } elsif ($command eq "delete") {
                    839: 	$editor->DeleteLine($p1);         # p1 - key p2 null.
                    840:     } else {			          # Should not get here!!!
                    841: 	die "Invalid command given to ApplyEdit $command"
                    842:     }
                    843: }
                    844: #
                    845: # AdjustOurHost:
                    846: #           Adjusts a host file stored in a configuration file editor object
                    847: #           for the true IP address of this host. This is necessary for hosts
                    848: #           that live behind a firewall.
                    849: #           Those hosts have a publicly distributed IP of the firewall, but
                    850: #           internally must use their actual IP.  We assume that a given
                    851: #           host only has a single IP interface for now.
                    852: # Formal Parameters:
                    853: #     editor   - The configuration file editor to adjust.  This
                    854: #                editor is assumed to contain a hosts.tab file.
                    855: # Strategy:
                    856: #    - Figure out our hostname.
                    857: #    - Lookup the entry for this host.
                    858: #    - Modify the line to contain our IP
                    859: #    - Do a replace for this host.
                    860: sub AdjustOurHost {
                    861:     my $editor        = shift;
                    862: 
                    863:     # figure out who I am.
                    864: 
                    865:     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.
                    866: 
                    867:     #  Get my host file entry.
                    868: 
                    869:     my $ConfigLine    = $editor->Find($myHostName);
                    870:     if(! (defined $ConfigLine)) {
                    871: 	die "AdjustOurHost - no entry for me in hosts file $myHostName";
                    872:     }
                    873:     # figure out my IP:
                    874:     #   Use the config line to get my hostname.
                    875:     #   Use gethostbyname to translate that into an IP address.
                    876:     #
1.338     albertel  877:     my ($id,$domain,$role,$name,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
1.169     foxr      878:     #
                    879:     #  Reassemble the config line from the elements in the list.
                    880:     #  Note that if the loncnew items were not present before, they will
                    881:     #  be now even if they would be empty
                    882:     #
                    883:     my $newConfigLine = $id;
1.338     albertel  884:     foreach my $item ($domain, $role, $name, $maxcon, $idleto, $mincon) {
1.169     foxr      885: 	$newConfigLine .= ":".$item;
                    886:     }
                    887:     #  Replace the line:
                    888: 
                    889:     $editor->ReplaceLine($id, $newConfigLine);
                    890:     
                    891: }
                    892: #
                    893: #   ReplaceConfigFile:
                    894: #              Replaces a configuration file with the contents of a
                    895: #              configuration file editor object.
                    896: #              This is done by:
                    897: #              - Copying the target file to <filename>.old
                    898: #              - Writing the new file to <filename>.tmp
                    899: #              - Moving <filename.tmp>  -> <filename>
                    900: #              This laborious process ensures that the system is never without
                    901: #              a configuration file that's at least valid (even if the contents
                    902: #              may be dated).
                    903: #   Parameters:
                    904: #        filename   - Name of the file to modify... this is a full path.
                    905: #        editor     - Editor containing the file.
                    906: #
                    907: sub ReplaceConfigFile {
1.192     foxr      908:     
                    909:     my ($filename, $editor) = @_;
1.168     foxr      910: 
1.169     foxr      911:     CopyFile ($filename, $filename.".old");
                    912: 
                    913:     my $contents  = $editor->Get(); # Get the contents of the file.
                    914: 
                    915:     InstallFile($filename, $contents);
                    916: }
1.168     foxr      917: #   
                    918: #
                    919: #   Called to edit a configuration table  file
1.167     foxr      920: #   Parameters:
                    921: #      request           - The entire command/request sent by lonc or lonManage
                    922: #   Return:
                    923: #      The reply to send to the client.
1.168     foxr      924: #
1.167     foxr      925: sub EditFile {
                    926:     my $request = shift;
                    927: 
                    928:     #  Split the command into it's pieces:  edit:filetype:script
                    929: 
1.339     albertel  930:     my ($cmd, $filetype, $script) = split(/:/, $request,3);	# : in script
1.167     foxr      931: 
                    932:     #  Check the pre-coditions for success:
                    933: 
1.339     albertel  934:     if($cmd != "edit") {	# Something is amiss afoot alack.
1.167     foxr      935: 	return "error:edit request detected, but request != 'edit'\n";
                    936:     }
                    937:     if( ($filetype ne "hosts")  &&
                    938: 	($filetype ne "domain")) {
                    939: 	return "error:edit requested with invalid file specifier: $filetype \n";
                    940:     }
                    941: 
                    942:     #   Split the edit script and check it's validity.
1.168     foxr      943: 
                    944:     my @scriptlines = split(/\n/, $script);  # one line per element.
                    945:     my $linecount   = scalar(@scriptlines);
                    946:     for(my $i = 0; $i < $linecount; $i++) {
                    947: 	chomp($scriptlines[$i]);
                    948: 	if(!isValidEditCommand($scriptlines[$i])) {
                    949: 	    return "error:edit with bad script line: '$scriptlines[$i]' \n";
                    950: 	}
                    951:     }
1.145     foxr      952: 
1.167     foxr      953:     #   Execute the edit operation.
1.169     foxr      954:     #   - Create a config file editor for the appropriate file and 
                    955:     #   - execute each command in the script:
                    956:     #
                    957:     my $configfile = ConfigFileFromSelector($filetype);
                    958:     if (!(defined $configfile)) {
                    959: 	return "refused\n";
                    960:     }
                    961:     my $editor = ConfigFileEdit->new($configfile);
1.167     foxr      962: 
1.169     foxr      963:     for (my $i = 0; $i < $linecount; $i++) {
                    964: 	ApplyEdit($scriptlines[$i], $editor);
                    965:     }
                    966:     # If the file is the host file, ensure that our host is
                    967:     # adjusted to have our ip:
                    968:     #
                    969:     if($filetype eq "host") {
                    970: 	AdjustOurHost($editor);
                    971:     }
                    972:     #  Finally replace the current file with our file.
                    973:     #
                    974:     ReplaceConfigFile($configfile, $editor);
1.167     foxr      975: 
                    976:     return "ok\n";
                    977: }
1.207     foxr      978: 
1.255     foxr      979: #   read_profile
                    980: #
                    981: #   Returns a set of specific entries from a user's profile file.
                    982: #   this is a utility function that is used by both get_profile_entry and
                    983: #   get_profile_entry_encrypted.
                    984: #
                    985: # Parameters:
                    986: #    udom       - Domain in which the user exists.
                    987: #    uname      - User's account name (loncapa account)
                    988: #    namespace  - The profile namespace to open.
                    989: #    what       - A set of & separated queries.
                    990: # Returns:
                    991: #    If all ok: - The string that needs to be shipped back to the user.
                    992: #    If failure - A string that starts with error: followed by the failure
                    993: #                 reason.. note that this probabyl gets shipped back to the
                    994: #                 user as well.
                    995: #
                    996: sub read_profile {
                    997:     my ($udom, $uname, $namespace, $what) = @_;
                    998:     
                    999:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   1000: 				 &GDBM_READER());
                   1001:     if ($hashref) {
                   1002:         my @queries=split(/\&/,$what);
1.440     raeburn  1003:         if ($namespace eq 'roles') {
                   1004:             @queries = map { &unescape($_); } @queries; 
                   1005:         }
1.255     foxr     1006:         my $qresult='';
                   1007: 	
                   1008: 	for (my $i=0;$i<=$#queries;$i++) {
                   1009: 	    $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
                   1010: 	}
                   1011: 	$qresult=~s/\&$//;              # Remove trailing & from last lookup.
1.311     albertel 1012: 	if (&untie_user_hash($hashref)) {
1.255     foxr     1013: 	    return $qresult;
                   1014: 	} else {
                   1015: 	    return "error: ".($!+0)." untie (GDBM) Failed";
                   1016: 	}
                   1017:     } else {
                   1018: 	if ($!+0 == 2) {
                   1019: 	    return "error:No such file or GDBM reported bad block error";
                   1020: 	} else {
                   1021: 	    return "error: ".($!+0)." tie (GDBM) Failed";
                   1022: 	}
                   1023:     }
                   1024: 
                   1025: }
1.214     foxr     1026: #--------------------- Request Handlers --------------------------------------------
                   1027: #
1.215     foxr     1028: #   By convention each request handler registers itself prior to the sub 
                   1029: #   declaration:
1.214     foxr     1030: #
                   1031: 
1.216     foxr     1032: #++
                   1033: #
1.214     foxr     1034: #  Handles ping requests.
                   1035: #  Parameters:
                   1036: #      $cmd    - the actual keyword that invoked us.
                   1037: #      $tail   - the tail of the request that invoked us.
                   1038: #      $replyfd- File descriptor connected to the client
                   1039: #  Implicit Inputs:
                   1040: #      $currenthostid - Global variable that carries the name of the host we are
                   1041: #                       known as.
                   1042: #  Returns:
                   1043: #      1       - Ok to continue processing.
                   1044: #      0       - Program should exit.
                   1045: #  Side effects:
                   1046: #      Reply information is sent to the client.
                   1047: sub ping_handler {
                   1048:     my ($cmd, $tail, $client) = @_;
                   1049:     Debug("$cmd $tail $client .. $currenthostid:");
                   1050:    
1.387     albertel 1051:     Reply( $client,\$currenthostid,"$cmd:$tail");
1.214     foxr     1052:    
                   1053:     return 1;
                   1054: }
                   1055: &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
                   1056: 
1.216     foxr     1057: #++
1.215     foxr     1058: #
                   1059: # Handles pong requests.  Pong replies with our current host id, and
                   1060: #                         the results of a ping sent to us via our lonc.
                   1061: #
                   1062: # Parameters:
                   1063: #      $cmd    - the actual keyword that invoked us.
                   1064: #      $tail   - the tail of the request that invoked us.
                   1065: #      $replyfd- File descriptor connected to the client
                   1066: #  Implicit Inputs:
                   1067: #      $currenthostid - Global variable that carries the name of the host we are
                   1068: #                       connected to.
                   1069: #  Returns:
                   1070: #      1       - Ok to continue processing.
                   1071: #      0       - Program should exit.
                   1072: #  Side effects:
                   1073: #      Reply information is sent to the client.
                   1074: sub pong_handler {
                   1075:     my ($cmd, $tail, $replyfd) = @_;
                   1076: 
1.365     albertel 1077:     my $reply=&Apache::lonnet::reply("ping",$clientname);
1.215     foxr     1078:     &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
                   1079:     return 1;
                   1080: }
                   1081: &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
                   1082: 
1.216     foxr     1083: #++
                   1084: #      Called to establish an encrypted session key with the remote client.
                   1085: #      Note that with secure lond, in most cases this function is never
                   1086: #      invoked.  Instead, the secure session key is established either
                   1087: #      via a local file that's locked down tight and only lives for a short
                   1088: #      time, or via an ssl tunnel...and is generated from a bunch-o-random
                   1089: #      bits from /dev/urandom, rather than the predictable pattern used by
                   1090: #      by this sub.  This sub is only used in the old-style insecure
                   1091: #      key negotiation.
                   1092: # Parameters:
                   1093: #      $cmd    - the actual keyword that invoked us.
                   1094: #      $tail   - the tail of the request that invoked us.
                   1095: #      $replyfd- File descriptor connected to the client
                   1096: #  Implicit Inputs:
                   1097: #      $currenthostid - Global variable that carries the name of the host
                   1098: #                       known as.
1.448     raeburn  1099: #      $clientname    - Global variable that carries the name of the host we're connected to.
1.216     foxr     1100: #  Returns:
                   1101: #      1       - Ok to continue processing.
                   1102: #      0       - Program should exit.
                   1103: #  Implicit Outputs:
                   1104: #      Reply information is sent to the client.
                   1105: #      $cipher is set with a reference to a new IDEA encryption object.
                   1106: #
                   1107: sub establish_key_handler {
                   1108:     my ($cmd, $tail, $replyfd) = @_;
                   1109: 
                   1110:     my $buildkey=time.$$.int(rand 100000);
                   1111:     $buildkey=~tr/1-6/A-F/;
                   1112:     $buildkey=int(rand 100000).$buildkey.int(rand 100000);
                   1113:     my $key=$currenthostid.$clientname;
                   1114:     $key=~tr/a-z/A-Z/;
                   1115:     $key=~tr/G-P/0-9/;
                   1116:     $key=~tr/Q-Z/0-9/;
                   1117:     $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
                   1118:     $key=substr($key,0,32);
                   1119:     my $cipherkey=pack("H32",$key);
                   1120:     $cipher=new IDEA $cipherkey;
1.387     albertel 1121:     &Reply($replyfd, \$buildkey, "$cmd:$tail"); 
1.216     foxr     1122:    
                   1123:     return 1;
                   1124: 
                   1125: }
                   1126: &register_handler("ekey", \&establish_key_handler, 0, 1,1);
                   1127: 
1.217     foxr     1128: #     Handler for the load command.  Returns the current system load average
                   1129: #     to the requestor.
                   1130: #
                   1131: # Parameters:
                   1132: #      $cmd    - the actual keyword that invoked us.
                   1133: #      $tail   - the tail of the request that invoked us.
                   1134: #      $replyfd- File descriptor connected to the client
                   1135: #  Implicit Inputs:
                   1136: #      $currenthostid - Global variable that carries the name of the host
                   1137: #                       known as.
1.448     raeburn  1138: #      $clientname    - Global variable that carries the name of the host we're connected to.
1.217     foxr     1139: #  Returns:
                   1140: #      1       - Ok to continue processing.
                   1141: #      0       - Program should exit.
                   1142: #  Side effects:
                   1143: #      Reply information is sent to the client.
                   1144: sub load_handler {
                   1145:     my ($cmd, $tail, $replyfd) = @_;
                   1146: 
1.463     foxr     1147: 
                   1148: 
1.217     foxr     1149:    # Get the load average from /proc/loadavg and calculate it as a percentage of
                   1150:    # the allowed load limit as set by the perl global variable lonLoadLim
                   1151: 
                   1152:     my $loadavg;
                   1153:     my $loadfile=IO::File->new('/proc/loadavg');
                   1154:    
                   1155:     $loadavg=<$loadfile>;
                   1156:     $loadavg =~ s/\s.*//g;                      # Extract the first field only.
                   1157:    
                   1158:     my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
                   1159: 
1.387     albertel 1160:     &Reply( $replyfd, \$loadpercent, "$cmd:$tail");
1.217     foxr     1161:    
                   1162:     return 1;
                   1163: }
1.263     albertel 1164: &register_handler("load", \&load_handler, 0, 1, 0);
1.217     foxr     1165: 
                   1166: #
                   1167: #   Process the userload request.  This sub returns to the client the current
                   1168: #  user load average.  It can be invoked either by clients or managers.
                   1169: #
                   1170: # Parameters:
                   1171: #      $cmd    - the actual keyword that invoked us.
                   1172: #      $tail   - the tail of the request that invoked us.
                   1173: #      $replyfd- File descriptor connected to the client
                   1174: #  Implicit Inputs:
                   1175: #      $currenthostid - Global variable that carries the name of the host
                   1176: #                       known as.
1.448     raeburn  1177: #      $clientname    - Global variable that carries the name of the host we're connected to.
1.217     foxr     1178: #  Returns:
                   1179: #      1       - Ok to continue processing.
                   1180: #      0       - Program should exit
                   1181: # Implicit inputs:
                   1182: #     whatever the userload() function requires.
                   1183: #  Implicit outputs:
                   1184: #     the reply is written to the client.
                   1185: #
                   1186: sub user_load_handler {
                   1187:     my ($cmd, $tail, $replyfd) = @_;
                   1188: 
1.365     albertel 1189:     my $userloadpercent=&Apache::lonnet::userload();
1.387     albertel 1190:     &Reply($replyfd, \$userloadpercent, "$cmd:$tail");
1.217     foxr     1191:     
                   1192:     return 1;
                   1193: }
1.263     albertel 1194: &register_handler("userload", \&user_load_handler, 0, 1, 0);
1.217     foxr     1195: 
1.218     foxr     1196: #   Process a request for the authorization type of a user:
                   1197: #   (userauth).
                   1198: #
                   1199: # Parameters:
                   1200: #      $cmd    - the actual keyword that invoked us.
                   1201: #      $tail   - the tail of the request that invoked us.
                   1202: #      $replyfd- File descriptor connected to the client
                   1203: #  Returns:
                   1204: #      1       - Ok to continue processing.
                   1205: #      0       - Program should exit
                   1206: # Implicit outputs:
                   1207: #    The user authorization type is written to the client.
                   1208: #
                   1209: sub user_authorization_type {
                   1210:     my ($cmd, $tail, $replyfd) = @_;
                   1211:    
                   1212:     my $userinput = "$cmd:$tail";
                   1213:    
                   1214:     #  Pull the domain and username out of the command tail.
1.222     foxr     1215:     # and call get_auth_type to determine the authentication type.
1.218     foxr     1216:    
                   1217:     my ($udom,$uname)=split(/:/,$tail);
1.222     foxr     1218:     my $result = &get_auth_type($udom, $uname);
1.218     foxr     1219:     if($result eq "nouser") {
                   1220: 	&Failure( $replyfd, "unknown_user\n", $userinput);
                   1221:     } else {
                   1222: 	#
1.222     foxr     1223: 	# We only want to pass the second field from get_auth_type
1.218     foxr     1224: 	# for ^krb.. otherwise we'll be handing out the encrypted
                   1225: 	# password for internals e.g.
                   1226: 	#
                   1227: 	my ($type,$otherinfo) = split(/:/,$result);
                   1228: 	if($type =~ /^krb/) {
                   1229: 	    $type = $result;
1.269     raeburn  1230: 	} else {
                   1231:             $type .= ':';
                   1232:         }
1.387     albertel 1233: 	&Reply( $replyfd, \$type, $userinput);
1.218     foxr     1234:     }
                   1235:   
                   1236:     return 1;
                   1237: }
                   1238: &register_handler("currentauth", \&user_authorization_type, 1, 1, 0);
                   1239: 
                   1240: #   Process a request by a manager to push a hosts or domain table 
                   1241: #   to us.  We pick apart the command and pass it on to the subs
                   1242: #   that already exist to do this.
                   1243: #
                   1244: # Parameters:
                   1245: #      $cmd    - the actual keyword that invoked us.
                   1246: #      $tail   - the tail of the request that invoked us.
                   1247: #      $client - File descriptor connected to the client
                   1248: #  Returns:
                   1249: #      1       - Ok to continue processing.
                   1250: #      0       - Program should exit
                   1251: # Implicit Output:
                   1252: #    a reply is written to the client.
                   1253: sub push_file_handler {
                   1254:     my ($cmd, $tail, $client) = @_;
1.412     foxr     1255:     &Debug("In push file handler");
1.218     foxr     1256:     my $userinput = "$cmd:$tail";
                   1257: 
                   1258:     # At this time we only know that the IP of our partner is a valid manager
                   1259:     # the code below is a hook to do further authentication (e.g. to resolve
                   1260:     # spoofing).
                   1261: 
                   1262:     my $cert = &GetCertificate($userinput);
1.412     foxr     1263:     if(&ValidManager($cert)) {
                   1264: 	&Debug("Valid manager: $client");
1.218     foxr     1265: 
                   1266: 	# Now presumably we have the bona fides of both the peer host and the
                   1267: 	# process making the request.
                   1268:       
                   1269: 	my $reply = &PushFile($userinput);
1.387     albertel 1270: 	&Reply($client, \$reply, $userinput);
1.218     foxr     1271: 
                   1272:     } else {
1.412     foxr     1273: 	&logthis("push_file_handler $client is not valid");
1.218     foxr     1274: 	&Failure( $client, "refused\n", $userinput);
                   1275:     } 
1.219     foxr     1276:     return 1;
1.218     foxr     1277: }
                   1278: &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
                   1279: 
1.399     raeburn  1280: # The du_handler routine should be considered obsolete and is retained
                   1281: # for communication with legacy servers.  Please see the du2_handler.
1.243     banghart 1282: #
1.399     raeburn  1283: #   du  - list the disk usage of a directory recursively. 
1.243     banghart 1284: #    
                   1285: #   note: stolen code from the ls file handler
                   1286: #   under construction by Rick Banghart 
                   1287: #    .
                   1288: # Parameters:
                   1289: #    $cmd        - The command that dispatched us (du).
                   1290: #    $ududir     - The directory path to list... I'm not sure what this
                   1291: #                  is relative as things like ls:. return e.g.
                   1292: #                  no_such_dir.
                   1293: #    $client     - Socket open on the client.
                   1294: # Returns:
                   1295: #     1 - indicating that the daemon should not disconnect.
                   1296: # Side Effects:
                   1297: #   The reply is written to  $client.
                   1298: #
                   1299: sub du_handler {
                   1300:     my ($cmd, $ududir, $client) = @_;
1.339     albertel 1301:     ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
1.251     foxr     1302:     my $userinput = "$cmd:$ududir";
                   1303: 
1.245     albertel 1304:     if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
                   1305: 	&Failure($client,"refused\n","$cmd:$ududir");
                   1306: 	return 1;
                   1307:     }
1.249     foxr     1308:     #  Since $ududir could have some nasties in it,
                   1309:     #  we will require that ududir is a valid
                   1310:     #  directory.  Just in case someone tries to
                   1311:     #  slip us a  line like .;(cd /home/httpd rm -rf*)
                   1312:     #  etc.
                   1313:     #
                   1314:     if (-d $ududir) {
1.292     albertel 1315: 	my $total_size=0;
                   1316: 	my $code=sub { 
                   1317: 	    if ($_=~/\.\d+\./) { return;} 
                   1318: 	    if ($_=~/\.meta$/) { return;}
1.362     albertel 1319: 	    if (-d $_)         { return;}
1.292     albertel 1320: 	    $total_size+=(stat($_))[7];
                   1321: 	};
1.295     raeburn  1322: 	chdir($ududir);
1.292     albertel 1323: 	find($code,$ududir);
                   1324: 	$total_size=int($total_size/1024);
1.387     albertel 1325: 	&Reply($client,\$total_size,"$cmd:$ududir");
1.249     foxr     1326:     } else {
1.251     foxr     1327: 	&Failure($client, "bad_directory:$ududir\n","$cmd:$ududir"); 
1.249     foxr     1328:     }
1.243     banghart 1329:     return 1;
                   1330: }
                   1331: &register_handler("du", \&du_handler, 0, 1, 0);
1.218     foxr     1332: 
1.399     raeburn  1333: # Please also see the du_handler, which is obsoleted by du2. 
                   1334: # du2_handler differs from du_handler in that required path to directory
                   1335: # provided by &propath() is prepended in the handler instead of on the 
                   1336: # client side.
1.239     foxr     1337: #
1.399     raeburn  1338: #   du2  - list the disk usage of a directory recursively.
                   1339: #
                   1340: # Parameters:
                   1341: #    $cmd        - The command that dispatched us (du).
                   1342: #    $tail       - The tail of the request that invoked us.
                   1343: #                  $tail is a : separated list of the following:
                   1344: #                   - $ududir - directory path to list (before prepending)
                   1345: #                   - $getpropath = 1 if &propath() should prepend
                   1346: #                   - $uname - username to use for &propath or user dir
                   1347: #                   - $udom - domain to use for &propath or user dir
                   1348: #                   All are escaped.
                   1349: #    $client     - Socket open on the client.
                   1350: # Returns:
                   1351: #     1 - indicating that the daemon should not disconnect.
                   1352: # Side Effects:
                   1353: #   The reply is written to $client.
                   1354: #
                   1355: 
                   1356: sub du2_handler {
                   1357:     my ($cmd, $tail, $client) = @_;
                   1358:     my ($ududir,$getpropath,$uname,$udom) = map { &unescape($_) } (split(/:/, $tail));
                   1359:     my $userinput = "$cmd:$tail";
                   1360:     if (($ududir=~/\.\./) || (($ududir!~m|^/home/httpd/|) && (!$getpropath))) {
                   1361:         &Failure($client,"refused\n","$cmd:$tail");
                   1362:         return 1;
                   1363:     }
                   1364:     if ($getpropath) {
                   1365:         if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
                   1366:             $ududir = &propath($udom,$uname).'/'.$ududir;
                   1367:         } else {
                   1368:             &Failure($client,"refused\n","$cmd:$tail");
                   1369:             return 1;
                   1370:         }
                   1371:     }
                   1372:     #  Since $ududir could have some nasties in it,
                   1373:     #  we will require that ududir is a valid
                   1374:     #  directory.  Just in case someone tries to
                   1375:     #  slip us a  line like .;(cd /home/httpd rm -rf*)
                   1376:     #  etc.
                   1377:     #
                   1378:     if (-d $ududir) {
                   1379:         my $total_size=0;
                   1380:         my $code=sub {
                   1381:             if ($_=~/\.\d+\./) { return;}
                   1382:             if ($_=~/\.meta$/) { return;}
                   1383:             if (-d $_)         { return;}
                   1384:             $total_size+=(stat($_))[7];
                   1385:         };
                   1386:         chdir($ududir);
                   1387:         find($code,$ududir);
                   1388:         $total_size=int($total_size/1024);
                   1389:         &Reply($client,\$total_size,"$cmd:$ududir");
                   1390:     } else {
                   1391:         &Failure($client, "bad_directory:$ududir\n","$cmd:$tail");
                   1392:     }
                   1393:     return 1;
                   1394: }
                   1395: &register_handler("du2", \&du2_handler, 0, 1, 0);
                   1396: 
                   1397: #
                   1398: # The ls_handler routine should be considered obsolete and is retained
                   1399: # for communication with legacy servers.  Please see the ls3_handler.
1.280     matthew  1400: #
1.239     foxr     1401: #   ls  - list the contents of a directory.  For each file in the
                   1402: #    selected directory the filename followed by the full output of
                   1403: #    the stat function is returned.  The returned info for each
                   1404: #    file are separated by ':'.  The stat fields are separated by &'s.
                   1405: # Parameters:
                   1406: #    $cmd        - The command that dispatched us (ls).
                   1407: #    $ulsdir     - The directory path to list... I'm not sure what this
                   1408: #                  is relative as things like ls:. return e.g.
                   1409: #                  no_such_dir.
                   1410: #    $client     - Socket open on the client.
                   1411: # Returns:
                   1412: #     1 - indicating that the daemon should not disconnect.
                   1413: # Side Effects:
                   1414: #   The reply is written to  $client.
                   1415: #
                   1416: sub ls_handler {
1.280     matthew  1417:     # obsoleted by ls2_handler
1.239     foxr     1418:     my ($cmd, $ulsdir, $client) = @_;
                   1419: 
                   1420:     my $userinput = "$cmd:$ulsdir";
                   1421: 
                   1422:     my $obs;
                   1423:     my $rights;
                   1424:     my $ulsout='';
                   1425:     my $ulsfn;
                   1426:     if (-e $ulsdir) {
                   1427: 	if(-d $ulsdir) {
                   1428: 	    if (opendir(LSDIR,$ulsdir)) {
                   1429: 		while ($ulsfn=readdir(LSDIR)) {
1.291     albertel 1430: 		    undef($obs);
                   1431: 		    undef($rights); 
1.239     foxr     1432: 		    my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   1433: 		    #We do some obsolete checking here
                   1434: 		    if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                   1435: 			open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                   1436: 			my @obsolete=<FILE>;
                   1437: 			foreach my $obsolete (@obsolete) {
1.301     www      1438: 			    if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
1.239     foxr     1439: 			    if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
                   1440: 			}
                   1441: 		    }
                   1442: 		    $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
                   1443: 		    if($obs eq '1') { $ulsout.="&1"; }
                   1444: 		    else { $ulsout.="&0"; }
                   1445: 		    if($rights eq '1') { $ulsout.="&1:"; }
                   1446: 		    else { $ulsout.="&0:"; }
                   1447: 		}
                   1448: 		closedir(LSDIR);
                   1449: 	    }
                   1450: 	} else {
                   1451: 	    my @ulsstats=stat($ulsdir);
                   1452: 	    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   1453: 	}
                   1454:     } else {
                   1455: 	$ulsout='no_such_dir';
                   1456:     }
                   1457:     if ($ulsout eq '') { $ulsout='empty'; }
1.387     albertel 1458:     &Reply($client, \$ulsout, $userinput); # This supports debug logging.
1.239     foxr     1459:     
                   1460:     return 1;
                   1461: 
                   1462: }
                   1463: &register_handler("ls", \&ls_handler, 0, 1, 0);
                   1464: 
1.399     raeburn  1465: # The ls2_handler routine should be considered obsolete and is retained
                   1466: # for communication with legacy servers.  Please see the ls3_handler.
                   1467: # Please also see the ls_handler, which was itself obsoleted by ls2.
1.280     matthew  1468: # ls2_handler differs from ls_handler in that it escapes its return 
                   1469: # values before concatenating them together with ':'s.
                   1470: #
                   1471: #   ls2  - list the contents of a directory.  For each file in the
                   1472: #    selected directory the filename followed by the full output of
                   1473: #    the stat function is returned.  The returned info for each
                   1474: #    file are separated by ':'.  The stat fields are separated by &'s.
                   1475: # Parameters:
                   1476: #    $cmd        - The command that dispatched us (ls).
                   1477: #    $ulsdir     - The directory path to list... I'm not sure what this
                   1478: #                  is relative as things like ls:. return e.g.
                   1479: #                  no_such_dir.
                   1480: #    $client     - Socket open on the client.
                   1481: # Returns:
                   1482: #     1 - indicating that the daemon should not disconnect.
                   1483: # Side Effects:
                   1484: #   The reply is written to  $client.
                   1485: #
                   1486: sub ls2_handler {
                   1487:     my ($cmd, $ulsdir, $client) = @_;
                   1488: 
                   1489:     my $userinput = "$cmd:$ulsdir";
                   1490: 
                   1491:     my $obs;
                   1492:     my $rights;
                   1493:     my $ulsout='';
                   1494:     my $ulsfn;
                   1495:     if (-e $ulsdir) {
                   1496:         if(-d $ulsdir) {
                   1497:             if (opendir(LSDIR,$ulsdir)) {
                   1498:                 while ($ulsfn=readdir(LSDIR)) {
1.291     albertel 1499:                     undef($obs);
                   1500: 		    undef($rights); 
1.280     matthew  1501:                     my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   1502:                     #We do some obsolete checking here
                   1503:                     if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                   1504:                         open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                   1505:                         my @obsolete=<FILE>;
                   1506:                         foreach my $obsolete (@obsolete) {
1.301     www      1507:                             if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
1.280     matthew  1508:                             if($obsolete =~ m|(<copyright>)(default)|) {
                   1509:                                 $rights = 1;
                   1510:                             }
                   1511:                         }
                   1512:                     }
                   1513:                     my $tmp = $ulsfn.'&'.join('&',@ulsstats);
                   1514:                     if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                   1515:                     if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                   1516:                     $ulsout.= &escape($tmp).':';
                   1517:                 }
                   1518:                 closedir(LSDIR);
                   1519:             }
                   1520:         } else {
                   1521:             my @ulsstats=stat($ulsdir);
                   1522:             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   1523:         }
                   1524:     } else {
                   1525:         $ulsout='no_such_dir';
                   1526:    }
                   1527:    if ($ulsout eq '') { $ulsout='empty'; }
1.387     albertel 1528:    &Reply($client, \$ulsout, $userinput); # This supports debug logging.
1.280     matthew  1529:    return 1;
                   1530: }
                   1531: &register_handler("ls2", \&ls2_handler, 0, 1, 0);
1.399     raeburn  1532: #
                   1533: #   ls3  - list the contents of a directory.  For each file in the
                   1534: #    selected directory the filename followed by the full output of
                   1535: #    the stat function is returned.  The returned info for each
                   1536: #    file are separated by ':'.  The stat fields are separated by &'s.
                   1537: # Parameters:
                   1538: #    $cmd        - The command that dispatched us (ls).
                   1539: #    $tail       - The tail of the request that invoked us.
                   1540: #                  $tail is a : separated list of the following:
                   1541: #                   - $ulsdir - directory path to list (before prepending)
                   1542: #                   - $getpropath = 1 if &propath() should prepend
                   1543: #                   - $getuserdir = 1 if path to user dir in lonUsers should
                   1544: #                                     prepend
                   1545: #                   - $alternate_root - path to prepend
                   1546: #                   - $uname - username to use for &propath or user dir
                   1547: #                   - $udom - domain to use for &propath or user dir
                   1548: #            All of these except $getpropath and &getuserdir are escaped.    
                   1549: #                  no_such_dir.
                   1550: #    $client     - Socket open on the client.
                   1551: # Returns:
                   1552: #     1 - indicating that the daemon should not disconnect.
                   1553: # Side Effects:
                   1554: #   The reply is written to $client.
                   1555: #
                   1556: 
                   1557: sub ls3_handler {
                   1558:     my ($cmd, $tail, $client) = @_;
                   1559:     my $userinput = "$cmd:$tail";
                   1560:     my ($ulsdir,$getpropath,$getuserdir,$alternate_root,$uname,$udom) =
                   1561:         split(/:/,$tail);
                   1562:     if (defined($ulsdir)) {
                   1563:         $ulsdir = &unescape($ulsdir);
                   1564:     }
                   1565:     if (defined($alternate_root)) {
                   1566:         $alternate_root = &unescape($alternate_root);
                   1567:     }
                   1568:     if (defined($uname)) {
                   1569:         $uname = &unescape($uname);
                   1570:     }
                   1571:     if (defined($udom)) {
                   1572:         $udom = &unescape($udom);
                   1573:     }
                   1574: 
                   1575:     my $dir_root = $perlvar{'lonDocRoot'};
                   1576:     if ($getpropath) {
                   1577:         if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
                   1578:             $dir_root = &propath($udom,$uname);
                   1579:             $dir_root =~ s/\/$//;
                   1580:         } else {
                   1581:             &Failure($client,"refused\n","$cmd:$tail");
                   1582:             return 1;
                   1583:         }
                   1584:     } elsif ($getuserdir) {
                   1585:         if (($uname =~ /^$LONCAPA::match_name$/) && ($udom =~ /^$LONCAPA::match_domain$/)) {
                   1586:             my $subdir=$uname.'__';
                   1587:             $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
                   1588:             $dir_root = $Apache::lonnet::perlvar{'lonUsersDir'}
                   1589:                        ."/$udom/$subdir/$uname";
                   1590:         } else {
                   1591:             &Failure($client,"refused\n","$cmd:$tail");
                   1592:             return 1;
                   1593:         }
1.400     raeburn  1594:     } elsif ($alternate_root ne '') {
1.399     raeburn  1595:         $dir_root = $alternate_root;
                   1596:     }
1.408     raeburn  1597:     if (($dir_root ne '') && ($dir_root ne '/')) {
1.400     raeburn  1598:         if ($ulsdir =~ /^\//) {
                   1599:             $ulsdir = $dir_root.$ulsdir;
                   1600:         } else {
                   1601:             $ulsdir = $dir_root.'/'.$ulsdir;
                   1602:         }
1.399     raeburn  1603:     }
                   1604:     my $obs;
                   1605:     my $rights;
                   1606:     my $ulsout='';
                   1607:     my $ulsfn;
                   1608:     if (-e $ulsdir) {
                   1609:         if(-d $ulsdir) {
                   1610:             if (opendir(LSDIR,$ulsdir)) {
                   1611:                 while ($ulsfn=readdir(LSDIR)) {
                   1612:                     undef($obs);
                   1613:                     undef($rights);
                   1614:                     my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   1615:                     #We do some obsolete checking here
                   1616:                     if(-e $ulsdir.'/'.$ulsfn.".meta") {
                   1617:                         open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                   1618:                         my @obsolete=<FILE>;
                   1619:                         foreach my $obsolete (@obsolete) {
                   1620:                             if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
                   1621:                             if($obsolete =~ m|(<copyright>)(default)|) {
                   1622:                                 $rights = 1;
                   1623:                             }
                   1624:                         }
                   1625:                     }
                   1626:                     my $tmp = $ulsfn.'&'.join('&',@ulsstats);
                   1627:                     if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                   1628:                     if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                   1629:                     $ulsout.= &escape($tmp).':';
                   1630:                 }
                   1631:                 closedir(LSDIR);
                   1632:             }
                   1633:         } else {
                   1634:             my @ulsstats=stat($ulsdir);
                   1635:             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   1636:         }
                   1637:     } else {
                   1638:         $ulsout='no_such_dir';
1.400     raeburn  1639:     }
                   1640:     if ($ulsout eq '') { $ulsout='empty'; }
                   1641:     &Reply($client, \$ulsout, $userinput); # This supports debug logging.
                   1642:     return 1;
1.399     raeburn  1643: }
                   1644: &register_handler("ls3", \&ls3_handler, 0, 1, 0);
1.280     matthew  1645: 
1.477     raeburn  1646: sub read_lonnet_global {
                   1647:     my ($cmd,$tail,$client) = @_;
                   1648:     my $userinput = "$cmd:$tail";
                   1649:     my $requested = &Apache::lonnet::thaw_unescape($tail);
                   1650:     my $result;
1.480     raeburn  1651:     my %packagevars = (
                   1652:                         spareid => \%Apache::lonnet::spareid,
                   1653:                         perlvar => \%Apache::lonnet::perlvar,
                   1654:                       );
                   1655:     my %limit_to = (
                   1656:                     perlvar => {
                   1657:                                  lonOtherAuthen => 1,
                   1658:                                  lonBalancer    => 1,
                   1659:                                  lonVersion     => 1,
                   1660:                                  lonSysEMail    => 1,
                   1661:                                  lonHostID      => 1,
                   1662:                                  lonRole        => 1,
                   1663:                                  lonDefDomain   => 1,
                   1664:                                  lonLoadLim     => 1,
                   1665:                                  lonUserLoadLim => 1,
                   1666:                                }
                   1667:                   );
1.477     raeburn  1668:     if (ref($requested) eq 'HASH') {
                   1669:         foreach my $what (keys(%{$requested})) {
                   1670:             my $response;
1.480     raeburn  1671:             my $items = {};
                   1672:             if (exists($packagevars{$what})) {
                   1673:                 if (ref($limit_to{$what}) eq 'HASH') {
                   1674:                     foreach my $varname (keys(%{$packagevars{$what}})) {
                   1675:                         if ($limit_to{$what}{$varname}) {
                   1676:                             $items->{$varname} = $packagevars{$what}{$varname};
                   1677:                         }
                   1678:                     }
                   1679:                 } else {
                   1680:                     $items = $packagevars{$what};
1.477     raeburn  1681:                 }
1.480     raeburn  1682:                 if ($what eq 'perlvar') {
                   1683:                     if (!exists($packagevars{$what}{'lonBalancer'})) {
                   1684:                         if ($dist =~ /^(centos|rhes|fedora|scientific)/) {
                   1685:                             my $othervarref=LONCAPA::Configuration::read_conf('httpd.conf');
                   1686:                             if (ref($othervarref) eq 'HASH') {
                   1687:                                 $items->{'lonBalancer'} = $othervarref->{'lonBalancer'};
                   1688:                             }
                   1689:                         }
                   1690:                     }
1.477     raeburn  1691:                 }
1.480     raeburn  1692:                 $response = &Apache::lonnet::freeze_escape($items);
1.477     raeburn  1693:             }
1.478     raeburn  1694:             $result .= &escape($what).'='.$response.'&';
1.477     raeburn  1695:         }
                   1696:     }
                   1697:     $result =~ s/\&$//;
                   1698:     &Reply($client,\$result,$userinput);
                   1699:     return 1;
                   1700: }
                   1701: &register_handler("readlonnetglobal", \&read_lonnet_global, 0, 1, 0);
                   1702: 
1.479     raeburn  1703: sub server_devalidatecache_handler {
                   1704:     my ($cmd,$tail,$client) = @_;
                   1705:     my $userinput = "$cmd:$tail";
                   1706:     my ($name,$id) = map { &unescape($_); } split(/:/,$tail);
                   1707:     &Apache::lonnet::devalidate_cache_new($name,$id);
                   1708:     my $result = 'ok';
                   1709:     &Reply($client,\$result,$userinput);
                   1710:     return 1;
                   1711: }
1.481     raeburn  1712: &register_handler("devalidatecache", \&server_devalidatecache_handler, 0, 1, 0);
1.479     raeburn  1713: 
1.410     raeburn  1714: sub server_timezone_handler {
                   1715:     my ($cmd,$tail,$client) = @_;
                   1716:     my $userinput = "$cmd:$tail";
                   1717:     my $timezone;
                   1718:     my $clockfile = '/etc/sysconfig/clock'; # Fedora/CentOS/SuSE
                   1719:     my $tzfile = '/etc/timezone'; # Debian/Ubuntu
                   1720:     if (-e $clockfile) {
                   1721:         if (open(my $fh,"<$clockfile")) {
                   1722:             while (<$fh>) {
                   1723:                 next if (/^[\#\s]/);
                   1724:                 if (/^(?:TIME)?ZONE\s*=\s*['"]?\s*([\w\/]+)/) {
                   1725:                     $timezone = $1;
                   1726:                     last;
                   1727:                 }
                   1728:             }
                   1729:             close($fh);
                   1730:         }
                   1731:     } elsif (-e $tzfile) {
                   1732:         if (open(my $fh,"<$tzfile")) {
                   1733:             $timezone = <$fh>;
                   1734:             close($fh);
                   1735:             chomp($timezone);
                   1736:             if ($timezone =~ m{^Etc/(\w+)$}) {
                   1737:                 $timezone = $1;
                   1738:             }
                   1739:         }
                   1740:     }
                   1741:     &Reply($client,\$timezone,$userinput); # This supports debug logging.
                   1742:     return 1;
                   1743: }
                   1744: &register_handler("servertimezone", \&server_timezone_handler, 0, 1, 0);
                   1745: 
1.413     raeburn  1746: sub server_loncaparev_handler {
                   1747:     my ($cmd,$tail,$client) = @_;
                   1748:     my $userinput = "$cmd:$tail";
                   1749:     &Reply($client,\$perlvar{'lonVersion'},$userinput);
                   1750:     return 1;
                   1751: }
                   1752: &register_handler("serverloncaparev", \&server_loncaparev_handler, 0, 1, 0);
                   1753: 
1.448     raeburn  1754: sub server_homeID_handler {
                   1755:     my ($cmd,$tail,$client) = @_;
                   1756:     my $userinput = "$cmd:$tail";
                   1757:     &Reply($client,\$perlvar{'lonHostID'},$userinput);
                   1758:     return 1;
                   1759: }
                   1760: &register_handler("serverhomeID", \&server_homeID_handler, 0, 1, 0);
                   1761: 
1.471     raeburn  1762: sub server_distarch_handler {
                   1763:     my ($cmd,$tail,$client) = @_;
                   1764:     my $userinput = "$cmd:$tail";
                   1765:     my $reply = &distro_and_arch();
                   1766:     &Reply($client,\$reply,$userinput);
                   1767:     return 1;
                   1768: }
                   1769: &register_handler("serverdistarch", \&server_distarch_handler, 0, 1, 0);
                   1770: 
1.218     foxr     1771: #   Process a reinit request.  Reinit requests that either
                   1772: #   lonc or lond be reinitialized so that an updated 
                   1773: #   host.tab or domain.tab can be processed.
                   1774: #
                   1775: # Parameters:
                   1776: #      $cmd    - the actual keyword that invoked us.
                   1777: #      $tail   - the tail of the request that invoked us.
                   1778: #      $client - File descriptor connected to the client
                   1779: #  Returns:
                   1780: #      1       - Ok to continue processing.
                   1781: #      0       - Program should exit
                   1782: #  Implicit output:
                   1783: #     a reply is sent to the client.
                   1784: #
                   1785: sub reinit_process_handler {
                   1786:     my ($cmd, $tail, $client) = @_;
                   1787:    
                   1788:     my $userinput = "$cmd:$tail";
                   1789:    
                   1790:     my $cert = &GetCertificate($userinput);
                   1791:     if(&ValidManager($cert)) {
                   1792: 	chomp($userinput);
                   1793: 	my $reply = &ReinitProcess($userinput);
1.387     albertel 1794: 	&Reply( $client,  \$reply, $userinput);
1.218     foxr     1795:     } else {
                   1796: 	&Failure( $client, "refused\n", $userinput);
                   1797:     }
                   1798:     return 1;
                   1799: }
                   1800: &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
                   1801: 
                   1802: #  Process the editing script for a table edit operation.
                   1803: #  the editing operation must be encrypted and requested by
                   1804: #  a manager host.
                   1805: #
                   1806: # Parameters:
                   1807: #      $cmd    - the actual keyword that invoked us.
                   1808: #      $tail   - the tail of the request that invoked us.
                   1809: #      $client - File descriptor connected to the client
                   1810: #  Returns:
                   1811: #      1       - Ok to continue processing.
                   1812: #      0       - Program should exit
                   1813: #  Implicit output:
                   1814: #     a reply is sent to the client.
                   1815: #
                   1816: sub edit_table_handler {
                   1817:     my ($command, $tail, $client) = @_;
                   1818:    
                   1819:     my $userinput = "$command:$tail";
                   1820: 
                   1821:     my $cert = &GetCertificate($userinput);
                   1822:     if(&ValidManager($cert)) {
                   1823: 	my($filetype, $script) = split(/:/, $tail);
                   1824: 	if (($filetype eq "hosts") || 
                   1825: 	    ($filetype eq "domain")) {
                   1826: 	    if($script ne "") {
                   1827: 		&Reply($client,              # BUGBUG - EditFile
                   1828: 		      &EditFile($userinput), #   could fail.
                   1829: 		      $userinput);
                   1830: 	    } else {
                   1831: 		&Failure($client,"refused\n",$userinput);
                   1832: 	    }
                   1833: 	} else {
                   1834: 	    &Failure($client,"refused\n",$userinput);
                   1835: 	}
                   1836:     } else {
                   1837: 	&Failure($client,"refused\n",$userinput);
                   1838:     }
                   1839:     return 1;
                   1840: }
1.263     albertel 1841: &register_handler("edit", \&edit_table_handler, 1, 0, 1);
1.218     foxr     1842: 
1.220     foxr     1843: #
                   1844: #   Authenticate a user against the LonCAPA authentication
                   1845: #   database.  Note that there are several authentication
                   1846: #   possibilities:
                   1847: #   - unix     - The user can be authenticated against the unix
                   1848: #                password file.
                   1849: #   - internal - The user can be authenticated against a purely 
                   1850: #                internal per user password file.
                   1851: #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
                   1852: #                ticket granting authority.
                   1853: #   - user     - The person tailoring LonCAPA can supply a user authentication
                   1854: #                mechanism that is per system.
                   1855: #
                   1856: # Parameters:
                   1857: #    $cmd      - The command that got us here.
                   1858: #    $tail     - Tail of the command (remaining parameters).
                   1859: #    $client   - File descriptor connected to client.
                   1860: # Returns
                   1861: #     0        - Requested to exit, caller should shut down.
                   1862: #     1        - Continue processing.
                   1863: # Implicit inputs:
                   1864: #    The authentication systems describe above have their own forms of implicit
                   1865: #    input into the authentication process that are described above.
                   1866: #
                   1867: sub authenticate_handler {
                   1868:     my ($cmd, $tail, $client) = @_;
                   1869: 
                   1870:     
                   1871:     #  Regenerate the full input line 
                   1872:     
                   1873:     my $userinput  = $cmd.":".$tail;
                   1874:     
                   1875:     #  udom    - User's domain.
                   1876:     #  uname   - Username.
                   1877:     #  upass   - User's password.
1.396     raeburn  1878:     #  checkdefauth - Pass to validate_user() to try authentication
                   1879:     #                 with default auth type(s) if no user account.
1.447     raeburn  1880:     #  clientcancheckhost - Passed by clients with functionality in lonauth.pm
                   1881:     #                       to check if session can be hosted.
1.220     foxr     1882:     
1.447     raeburn  1883:     my ($udom, $uname, $upass, $checkdefauth, $clientcancheckhost)=split(/:/,$tail);
1.399     raeburn  1884:     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass,  checkdefauth = $checkdefauth");
1.220     foxr     1885:     chomp($upass);
                   1886:     $upass=&unescape($upass);
                   1887: 
1.396     raeburn  1888:     my $pwdcorrect = &validate_user($udom,$uname,$upass,$checkdefauth);
1.220     foxr     1889:     if($pwdcorrect) {
1.447     raeburn  1890:         my $canhost = 1;
                   1891:         unless ($clientcancheckhost) {
1.448     raeburn  1892:             my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
                   1893:             my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
1.452     raeburn  1894:             my @intdoms;
                   1895:             my $internet_names = &Apache::lonnet::get_internet_names($clientname);
                   1896:             if (ref($internet_names) eq 'ARRAY') {
                   1897:                 @intdoms = @{$internet_names};
                   1898:             }
1.448     raeburn  1899:             unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
1.447     raeburn  1900:                 my ($remote,$hosted);
                   1901:                 my $remotesession = &get_usersession_config($udom,'remotesession');
                   1902:                 if (ref($remotesession) eq 'HASH') {
                   1903:                     $remote = $remotesession->{'remote'}
                   1904:                 }
1.448     raeburn  1905:                 my $hostedsession = &get_usersession_config($clienthomedom,'hostedsession');
1.447     raeburn  1906:                 if (ref($hostedsession) eq 'HASH') {
                   1907:                     $hosted = $hostedsession->{'hosted'};
                   1908:                 }
1.449     raeburn  1909:                 my $loncaparev = $clientversion;
                   1910:                 if ($loncaparev eq '') {
                   1911:                     $loncaparev = $Apache::lonnet::loncaparevs{$clientname};
                   1912:                 }
1.448     raeburn  1913:                 $canhost = &Apache::lonnet::can_host_session($udom,$clientname,
1.449     raeburn  1914:                                                              $loncaparev,
1.447     raeburn  1915:                                                              $remote,$hosted);
                   1916:             }
                   1917:         }
                   1918:         if ($canhost) {               
                   1919:             &Reply( $client, "authorized\n", $userinput);
                   1920:         } else {
                   1921:             &Reply( $client, "not_allowed_to_host\n", $userinput);
                   1922:         }
1.220     foxr     1923: 	#
                   1924: 	#  Bad credentials: Failed to authorize
                   1925: 	#
                   1926:     } else {
                   1927: 	&Failure( $client, "non_authorized\n", $userinput);
                   1928:     }
                   1929: 
                   1930:     return 1;
                   1931: }
1.263     albertel 1932: &register_handler("auth", \&authenticate_handler, 1, 1, 0);
1.214     foxr     1933: 
1.222     foxr     1934: #
                   1935: #   Change a user's password.  Note that this function is complicated by
                   1936: #   the fact that a user may be authenticated in more than one way:
                   1937: #   At present, we are not able to change the password for all types of
                   1938: #   authentication methods.  Only for:
                   1939: #      unix    - unix password or shadow passoword style authentication.
                   1940: #      local   - Locally written authentication mechanism.
                   1941: #   For now, kerb4 and kerb5 password changes are not supported and result
                   1942: #   in an error.
                   1943: # FUTURE WORK:
                   1944: #    Support kerberos passwd changes?
                   1945: # Parameters:
                   1946: #    $cmd      - The command that got us here.
                   1947: #    $tail     - Tail of the command (remaining parameters).
                   1948: #    $client   - File descriptor connected to client.
                   1949: # Returns
                   1950: #     0        - Requested to exit, caller should shut down.
                   1951: #     1        - Continue processing.
                   1952: # Implicit inputs:
                   1953: #    The authentication systems describe above have their own forms of implicit
                   1954: #    input into the authentication process that are described above.
                   1955: sub change_password_handler {
                   1956:     my ($cmd, $tail, $client) = @_;
                   1957: 
                   1958:     my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
                   1959: 
                   1960:     #
                   1961:     #  udom  - user's domain.
                   1962:     #  uname - Username.
                   1963:     #  upass - Current password.
                   1964:     #  npass - New password.
1.346     raeburn  1965:     #  context - Context in which this was called 
                   1966:     #            (preferences or reset_by_email).
1.428     raeburn  1967:     #  lonhost - HostID of server where request originated 
1.222     foxr     1968:    
1.428     raeburn  1969:     my ($udom,$uname,$upass,$npass,$context,$lonhost)=split(/:/,$tail);
1.222     foxr     1970: 
                   1971:     $upass=&unescape($upass);
                   1972:     $npass=&unescape($npass);
                   1973:     &Debug("Trying to change password for $uname");
                   1974: 
                   1975:     # First require that the user can be authenticated with their
1.346     raeburn  1976:     # old password unless context was 'reset_by_email':
                   1977:     
1.428     raeburn  1978:     my ($validated,$failure);
1.346     raeburn  1979:     if ($context eq 'reset_by_email') {
1.428     raeburn  1980:         if ($lonhost eq '') {
                   1981:             $failure = 'invalid_client';
                   1982:         } else {
                   1983:             $validated = 1;
                   1984:         }
1.346     raeburn  1985:     } else {
                   1986:         $validated = &validate_user($udom, $uname, $upass);
                   1987:     }
1.222     foxr     1988:     if($validated) {
                   1989: 	my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
                   1990: 	
                   1991: 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   1992: 	if ($howpwd eq 'internal') {
                   1993: 	    &Debug("internal auth");
                   1994: 	    my $salt=time;
                   1995: 	    $salt=substr($salt,6,2);
                   1996: 	    my $ncpass=crypt($npass,$salt);
                   1997: 	    if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
1.428     raeburn  1998: 		my $msg="Result of password change for $uname: pwchange_success";
                   1999:                 if ($lonhost) {
                   2000:                     $msg .= " - request originated from: $lonhost";
                   2001:                 }
                   2002:                 &logthis($msg);
1.222     foxr     2003: 		&Reply($client, "ok\n", $userinput);
                   2004: 	    } else {
                   2005: 		&logthis("Unable to open $uname passwd "               
                   2006: 			 ."to change password");
                   2007: 		&Failure( $client, "non_authorized\n",$userinput);
                   2008: 	    }
1.346     raeburn  2009: 	} elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') {
1.287     foxr     2010: 	    my $result = &change_unix_password($uname, $npass);
1.222     foxr     2011: 	    &logthis("Result of password change for $uname: ".
1.287     foxr     2012: 		     $result);
1.387     albertel 2013: 	    &Reply($client, \$result, $userinput);
1.222     foxr     2014: 	} else {
                   2015: 	    # this just means that the current password mode is not
                   2016: 	    # one we know how to change (e.g the kerberos auth modes or
                   2017: 	    # locally written auth handler).
                   2018: 	    #
                   2019: 	    &Failure( $client, "auth_mode_error\n", $userinput);
                   2020: 	}  
                   2021: 	
1.224     foxr     2022:     } else {
1.428     raeburn  2023: 	if ($failure eq '') {
                   2024: 	    $failure = 'non_authorized';
                   2025: 	}
                   2026: 	&Failure( $client, "$failure\n", $userinput);
1.222     foxr     2027:     }
                   2028: 
                   2029:     return 1;
                   2030: }
1.263     albertel 2031: &register_handler("passwd", \&change_password_handler, 1, 1, 0);
1.222     foxr     2032: 
1.225     foxr     2033: #
                   2034: #   Create a new user.  User in this case means a lon-capa user.
                   2035: #   The user must either already exist in some authentication realm
                   2036: #   like kerberos or the /etc/passwd.  If not, a user completely local to
                   2037: #   this loncapa system is created.
                   2038: #
                   2039: # Parameters:
                   2040: #    $cmd      - The command that got us here.
                   2041: #    $tail     - Tail of the command (remaining parameters).
                   2042: #    $client   - File descriptor connected to client.
                   2043: # Returns
                   2044: #     0        - Requested to exit, caller should shut down.
                   2045: #     1        - Continue processing.
                   2046: # Implicit inputs:
                   2047: #    The authentication systems describe above have their own forms of implicit
                   2048: #    input into the authentication process that are described above.
                   2049: sub add_user_handler {
                   2050: 
                   2051:     my ($cmd, $tail, $client) = @_;
                   2052: 
                   2053: 
                   2054:     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
                   2055:     my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
                   2056: 
                   2057:     &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
                   2058: 
                   2059: 
                   2060:     if($udom eq $currentdomainid) { # Reject new users for other domains...
                   2061: 	
                   2062: 	my $oldumask=umask(0077);
                   2063: 	chomp($npass);
                   2064: 	$npass=&unescape($npass);
                   2065: 	my $passfilename  = &password_path($udom, $uname);
                   2066: 	&Debug("Password file created will be:".$passfilename);
                   2067: 	if (-e $passfilename) {
                   2068: 	    &Failure( $client, "already_exists\n", $userinput);
                   2069: 	} else {
                   2070: 	    my $fperror='';
1.264     albertel 2071: 	    if (!&mkpath($passfilename)) {
                   2072: 		$fperror="error: ".($!+0)." mkdir failed while attempting "
                   2073: 		    ."makeuser";
1.225     foxr     2074: 	    }
                   2075: 	    unless ($fperror) {
1.483   ! www      2076: 		my $result=&make_passwd_file($uname,$udom,$umode,$npass, $passfilename);
1.390     raeburn  2077: 		&Reply($client,\$result, $userinput);     #BUGBUG - could be fail
1.225     foxr     2078: 	    } else {
1.387     albertel 2079: 		&Failure($client, \$fperror, $userinput);
1.225     foxr     2080: 	    }
                   2081: 	}
                   2082: 	umask($oldumask);
                   2083:     }  else {
                   2084: 	&Failure($client, "not_right_domain\n",
                   2085: 		$userinput);	# Even if we are multihomed.
                   2086:     
                   2087:     }
                   2088:     return 1;
                   2089: 
                   2090: }
                   2091: &register_handler("makeuser", \&add_user_handler, 1, 1, 0);
                   2092: 
                   2093: #
                   2094: #   Change the authentication method of a user.  Note that this may
                   2095: #   also implicitly change the user's password if, for example, the user is
                   2096: #   joining an existing authentication realm.  Known authentication realms at
                   2097: #   this time are:
                   2098: #    internal   - Purely internal password file (only loncapa knows this user)
                   2099: #    local      - Institutionally written authentication module.
                   2100: #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
                   2101: #    kerb4      - kerberos version 4
                   2102: #    kerb5      - kerberos version 5
                   2103: #
                   2104: # Parameters:
                   2105: #    $cmd      - The command that got us here.
                   2106: #    $tail     - Tail of the command (remaining parameters).
                   2107: #    $client   - File descriptor connected to client.
                   2108: # Returns
                   2109: #     0        - Requested to exit, caller should shut down.
                   2110: #     1        - Continue processing.
                   2111: # Implicit inputs:
                   2112: #    The authentication systems describe above have their own forms of implicit
                   2113: #    input into the authentication process that are described above.
1.287     foxr     2114: # NOTE:
                   2115: #   This is also used to change the authentication credential values (e.g. passwd).
                   2116: #   
1.225     foxr     2117: #
                   2118: sub change_authentication_handler {
                   2119: 
                   2120:     my ($cmd, $tail, $client) = @_;
                   2121:    
                   2122:     my $userinput  = "$cmd:$tail";              # Reconstruct user input.
                   2123: 
                   2124:     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
                   2125:     &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
                   2126:     if ($udom ne $currentdomainid) {
                   2127: 	&Failure( $client, "not_right_domain\n", $client);
                   2128:     } else {
                   2129: 	
                   2130: 	chomp($npass);
                   2131: 	
                   2132: 	$npass=&unescape($npass);
1.261     foxr     2133: 	my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
1.225     foxr     2134: 	my $passfilename = &password_path($udom, $uname);
                   2135: 	if ($passfilename) {	# Not allowed to create a new user!!
1.287     foxr     2136: 	    # If just changing the unix passwd. need to arrange to run
                   2137: 	    # passwd since otherwise make_passwd_file will run
                   2138: 	    # lcuseradd which fails if an account already exists
                   2139: 	    # (to prevent an unscrupulous LONCAPA admin from stealing
                   2140: 	    # an existing account by overwriting it as a LonCAPA account).
                   2141: 
                   2142: 	    if(($oldauth =~/^unix/) && ($umode eq "unix")) {
                   2143: 		my $result = &change_unix_password($uname, $npass);
                   2144: 		&logthis("Result of password change for $uname: ".$result);
                   2145: 		if ($result eq "ok") {
1.390     raeburn  2146: 		    &Reply($client, \$result);
1.288     albertel 2147: 		} else {
1.387     albertel 2148: 		    &Failure($client, \$result);
1.287     foxr     2149: 		}
1.288     albertel 2150: 	    } else {
1.483   ! www      2151: 		my $result=&make_passwd_file($uname,$udom,$umode,$npass,$passfilename);
1.287     foxr     2152: 		#
                   2153: 		#  If the current auth mode is internal, and the old auth mode was
                   2154: 		#  unix, or krb*,  and the user is an author for this domain,
                   2155: 		#  re-run manage_permissions for that role in order to be able
                   2156: 		#  to take ownership of the construction space back to www:www
                   2157: 		#
                   2158: 		
                   2159: 		
                   2160: 		if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
                   2161: 		    (($oldauth =~ /^internal/) && ($umode eq "unix")) ) { 
                   2162: 		    if(&is_author($udom, $uname)) {
                   2163: 			&Debug(" Need to manage author permissions...");
                   2164: 			&manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
                   2165: 		    }
1.261     foxr     2166: 		}
1.387     albertel 2167: 		&Reply($client, \$result, $userinput);
1.261     foxr     2168: 	    }
                   2169: 	       
                   2170: 
1.225     foxr     2171: 	} else {	       
1.251     foxr     2172: 	    &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
1.225     foxr     2173: 	}
                   2174:     }
                   2175:     return 1;
                   2176: }
                   2177: &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
                   2178: 
                   2179: #
                   2180: #   Determines if this is the home server for a user.  The home server
                   2181: #   for a user will have his/her lon-capa passwd file.  Therefore all we need
                   2182: #   to do is determine if this file exists.
                   2183: #
                   2184: # Parameters:
                   2185: #    $cmd      - The command that got us here.
                   2186: #    $tail     - Tail of the command (remaining parameters).
                   2187: #    $client   - File descriptor connected to client.
                   2188: # Returns
                   2189: #     0        - Requested to exit, caller should shut down.
                   2190: #     1        - Continue processing.
                   2191: # Implicit inputs:
                   2192: #    The authentication systems describe above have their own forms of implicit
                   2193: #    input into the authentication process that are described above.
                   2194: #
                   2195: sub is_home_handler {
                   2196:     my ($cmd, $tail, $client) = @_;
                   2197:    
                   2198:     my $userinput  = "$cmd:$tail";
                   2199:    
                   2200:     my ($udom,$uname)=split(/:/,$tail);
                   2201:     chomp($uname);
                   2202:     my $passfile = &password_filename($udom, $uname);
                   2203:     if($passfile) {
                   2204: 	&Reply( $client, "found\n", $userinput);
                   2205:     } else {
                   2206: 	&Failure($client, "not_found\n", $userinput);
                   2207:     }
                   2208:     return 1;
                   2209: }
                   2210: &register_handler("home", \&is_home_handler, 0,1,0);
                   2211: 
                   2212: #
1.434     www      2213: #   Process an update request for a resource.
                   2214: #   A resource has been modified that we hold a subscription to.
1.225     foxr     2215: #   If the resource is not local, then we must update, or at least invalidate our
                   2216: #   cached copy of the resource. 
                   2217: # Parameters:
                   2218: #    $cmd      - The command that got us here.
                   2219: #    $tail     - Tail of the command (remaining parameters).
                   2220: #    $client   - File descriptor connected to client.
                   2221: # Returns
                   2222: #     0        - Requested to exit, caller should shut down.
                   2223: #     1        - Continue processing.
                   2224: # Implicit inputs:
                   2225: #    The authentication systems describe above have their own forms of implicit
                   2226: #    input into the authentication process that are described above.
                   2227: #
                   2228: sub update_resource_handler {
                   2229: 
                   2230:     my ($cmd, $tail, $client) = @_;
                   2231:    
                   2232:     my $userinput = "$cmd:$tail";
                   2233:    
                   2234:     my $fname= $tail;		# This allows interactive testing
                   2235: 
                   2236: 
                   2237:     my $ownership=ishome($fname);
                   2238:     if ($ownership eq 'not_owner') {
                   2239: 	if (-e $fname) {
1.434     www      2240:             # Delete preview file, if exists
                   2241:             unlink("$fname.tmp");
                   2242:             # Get usage stats
1.225     foxr     2243: 	    my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
                   2244: 		$atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
                   2245: 	    my $now=time;
                   2246: 	    my $since=$now-$atime;
1.434     www      2247:             # If the file has not been used within lonExpire seconds,
                   2248:             # unsubscribe from it and delete local copy
1.225     foxr     2249: 	    if ($since>$perlvar{'lonExpire'}) {
1.365     albertel 2250: 		my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
1.308     albertel 2251: 		&devalidate_meta_cache($fname);
1.225     foxr     2252: 		unlink("$fname");
1.334     albertel 2253: 		unlink("$fname.meta");
1.225     foxr     2254: 	    } else {
1.434     www      2255:             # Yes, this is in active use. Get a fresh copy. Since it might be in
                   2256:             # very active use and huge (like a movie), copy it to "in.transfer" filename first.
1.225     foxr     2257: 		my $transname="$fname.in.transfer";
1.365     albertel 2258: 		my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
1.225     foxr     2259: 		my $response;
1.455     www      2260: # FIXME: cannot replicate files that take more than two minutes to transfer?
                   2261: #		alarm(120);
                   2262: # FIXME: this should use the LWP mechanism, not internal alarms.
                   2263:                 alarm(1200);
1.225     foxr     2264: 		{
                   2265: 		    my $ua=new LWP::UserAgent;
                   2266: 		    my $request=new HTTP::Request('GET',"$remoteurl");
                   2267: 		    $response=$ua->request($request,$transname);
                   2268: 		}
                   2269: 		alarm(0);
                   2270: 		if ($response->is_error()) {
1.455     www      2271: # FIXME: we should probably clean up here instead of just whine
1.225     foxr     2272: 		    unlink($transname);
                   2273: 		    my $message=$response->status_line;
                   2274: 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
                   2275: 		} else {
                   2276: 		    if ($remoteurl!~/\.meta$/) {
1.455     www      2277: # FIXME: isn't there an internal LWP mechanism for this?
1.225     foxr     2278: 			alarm(120);
                   2279: 			{
                   2280: 			    my $ua=new LWP::UserAgent;
                   2281: 			    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
                   2282: 			    my $mresponse=$ua->request($mrequest,$fname.'.meta');
                   2283: 			    if ($mresponse->is_error()) {
                   2284: 				unlink($fname.'.meta');
                   2285: 			    }
                   2286: 			}
                   2287: 			alarm(0);
                   2288: 		    }
1.434     www      2289:                     # we successfully transfered, copy file over to real name
1.225     foxr     2290: 		    rename($transname,$fname);
1.308     albertel 2291: 		    &devalidate_meta_cache($fname);
1.225     foxr     2292: 		}
                   2293: 	    }
                   2294: 	    &Reply( $client, "ok\n", $userinput);
                   2295: 	} else {
                   2296: 	    &Failure($client, "not_found\n", $userinput);
                   2297: 	}
                   2298:     } else {
                   2299: 	&Failure($client, "rejected\n", $userinput);
                   2300:     }
                   2301:     return 1;
                   2302: }
                   2303: &register_handler("update", \&update_resource_handler, 0 ,1, 0);
                   2304: 
1.308     albertel 2305: sub devalidate_meta_cache {
                   2306:     my ($url) = @_;
                   2307:     use Cache::Memcached;
                   2308:     my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
1.365     albertel 2309:     $url = &Apache::lonnet::declutter($url);
1.308     albertel 2310:     $url =~ s-\.meta$--;
                   2311:     my $id = &escape('meta:'.$url);
                   2312:     $memcache->delete($id);
                   2313: }
                   2314: 
1.225     foxr     2315: #
1.226     foxr     2316: #   Fetch a user file from a remote server to the user's home directory
                   2317: #   userfiles subdir.
1.225     foxr     2318: # Parameters:
                   2319: #    $cmd      - The command that got us here.
                   2320: #    $tail     - Tail of the command (remaining parameters).
                   2321: #    $client   - File descriptor connected to client.
                   2322: # Returns
                   2323: #     0        - Requested to exit, caller should shut down.
                   2324: #     1        - Continue processing.
                   2325: #
                   2326: sub fetch_user_file_handler {
                   2327: 
                   2328:     my ($cmd, $tail, $client) = @_;
                   2329: 
                   2330:     my $userinput = "$cmd:$tail";
                   2331:     my $fname           = $tail;
1.232     foxr     2332:     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
1.225     foxr     2333:     my $udir=&propath($udom,$uname).'/userfiles';
                   2334:     unless (-e $udir) {
                   2335: 	mkdir($udir,0770); 
                   2336:     }
1.232     foxr     2337:     Debug("fetch user file for $fname");
1.225     foxr     2338:     if (-e $udir) {
                   2339: 	$ufile=~s/^[\.\~]+//;
1.232     foxr     2340: 
                   2341: 	# IF necessary, create the path right down to the file.
                   2342: 	# Note that any regular files in the way of this path are
                   2343: 	# wiped out to deal with some earlier folly of mine.
                   2344: 
1.267     raeburn  2345: 	if (!&mkpath($udir.'/'.$ufile)) {
1.264     albertel 2346: 	    &Failure($client, "unable_to_create\n", $userinput);	    
1.232     foxr     2347: 	}
                   2348: 
1.225     foxr     2349: 	my $destname=$udir.'/'.$ufile;
                   2350: 	my $transname=$udir.'/'.$ufile.'.in.transit';
1.476     raeburn  2351:         my $clientprotocol=$Apache::lonnet::protocol{$clientname};
                   2352:         $clientprotocol = 'http' if ($clientprotocol ne 'https');
                   2353: 	my $remoteurl=$clientprotocol.'://'.$clientip.'/userfiles/'.$fname;
1.225     foxr     2354: 	my $response;
1.232     foxr     2355: 	Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
1.225     foxr     2356: 	alarm(120);
                   2357: 	{
                   2358: 	    my $ua=new LWP::UserAgent;
                   2359: 	    my $request=new HTTP::Request('GET',"$remoteurl");
                   2360: 	    $response=$ua->request($request,$transname);
                   2361: 	}
                   2362: 	alarm(0);
                   2363: 	if ($response->is_error()) {
                   2364: 	    unlink($transname);
                   2365: 	    my $message=$response->status_line;
                   2366: 	    &logthis("LWP GET: $message for $fname ($remoteurl)");
                   2367: 	    &Failure($client, "failed\n", $userinput);
                   2368: 	} else {
1.232     foxr     2369: 	    Debug("Renaming $transname to $destname");
1.225     foxr     2370: 	    if (!rename($transname,$destname)) {
                   2371: 		&logthis("Unable to move $transname to $destname");
                   2372: 		unlink($transname);
                   2373: 		&Failure($client, "failed\n", $userinput);
                   2374: 	    } else {
                   2375: 		&Reply($client, "ok\n", $userinput);
                   2376: 	    }
                   2377: 	}   
                   2378:     } else {
                   2379: 	&Failure($client, "not_home\n", $userinput);
                   2380:     }
                   2381:     return 1;
                   2382: }
                   2383: &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
                   2384: 
1.226     foxr     2385: #
                   2386: #   Remove a file from a user's home directory userfiles subdirectory.
                   2387: # Parameters:
                   2388: #    cmd   - the Lond request keyword that got us here.
                   2389: #    tail  - the part of the command past the keyword.
                   2390: #    client- File descriptor connected with the client.
                   2391: #
                   2392: # Returns:
                   2393: #    1    - Continue processing.
                   2394: sub remove_user_file_handler {
                   2395:     my ($cmd, $tail, $client) = @_;
                   2396: 
                   2397:     my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
                   2398: 
                   2399:     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
                   2400:     if ($ufile =~m|/\.\./|) {
                   2401: 	# any files paths with /../ in them refuse 
                   2402: 	# to deal with
                   2403: 	&Failure($client, "refused\n", "$cmd:$tail");
                   2404:     } else {
                   2405: 	my $udir = &propath($udom,$uname);
                   2406: 	if (-e $udir) {
                   2407: 	    my $file=$udir.'/userfiles/'.$ufile;
                   2408: 	    if (-e $file) {
1.253     foxr     2409: 		#
                   2410: 		#   If the file is a regular file unlink is fine...
                   2411: 		#   However it's possible the client wants a dir.
                   2412: 		#   removed, in which case rmdir is more approprate:
                   2413: 		#
1.240     banghart 2414: 	        if (-f $file){
1.241     albertel 2415: 		    unlink($file);
                   2416: 		} elsif(-d $file) {
                   2417: 		    rmdir($file);
1.240     banghart 2418: 		}
1.226     foxr     2419: 		if (-e $file) {
1.253     foxr     2420: 		    #  File is still there after we deleted it ?!?
                   2421: 
1.226     foxr     2422: 		    &Failure($client, "failed\n", "$cmd:$tail");
                   2423: 		} else {
                   2424: 		    &Reply($client, "ok\n", "$cmd:$tail");
                   2425: 		}
                   2426: 	    } else {
                   2427: 		&Failure($client, "not_found\n", "$cmd:$tail");
                   2428: 	    }
                   2429: 	} else {
                   2430: 	    &Failure($client, "not_home\n", "$cmd:$tail");
                   2431: 	}
                   2432:     }
                   2433:     return 1;
                   2434: }
                   2435: &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
                   2436: 
1.236     albertel 2437: #
                   2438: #   make a directory in a user's home directory userfiles subdirectory.
                   2439: # Parameters:
                   2440: #    cmd   - the Lond request keyword that got us here.
                   2441: #    tail  - the part of the command past the keyword.
                   2442: #    client- File descriptor connected with the client.
                   2443: #
                   2444: # Returns:
                   2445: #    1    - Continue processing.
                   2446: sub mkdir_user_file_handler {
                   2447:     my ($cmd, $tail, $client) = @_;
                   2448: 
                   2449:     my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
                   2450:     $dir=&unescape($dir);
                   2451:     my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
                   2452:     if ($ufile =~m|/\.\./|) {
                   2453: 	# any files paths with /../ in them refuse 
                   2454: 	# to deal with
                   2455: 	&Failure($client, "refused\n", "$cmd:$tail");
                   2456:     } else {
                   2457: 	my $udir = &propath($udom,$uname);
                   2458: 	if (-e $udir) {
1.264     albertel 2459: 	    my $newdir=$udir.'/userfiles/'.$ufile.'/';
                   2460: 	    if (!&mkpath($newdir)) {
                   2461: 		&Failure($client, "failed\n", "$cmd:$tail");
1.236     albertel 2462: 	    }
1.264     albertel 2463: 	    &Reply($client, "ok\n", "$cmd:$tail");
1.236     albertel 2464: 	} else {
                   2465: 	    &Failure($client, "not_home\n", "$cmd:$tail");
                   2466: 	}
                   2467:     }
                   2468:     return 1;
                   2469: }
                   2470: &register_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
                   2471: 
1.237     albertel 2472: #
                   2473: #   rename a file in a user's home directory userfiles subdirectory.
                   2474: # Parameters:
                   2475: #    cmd   - the Lond request keyword that got us here.
                   2476: #    tail  - the part of the command past the keyword.
                   2477: #    client- File descriptor connected with the client.
                   2478: #
                   2479: # Returns:
                   2480: #    1    - Continue processing.
                   2481: sub rename_user_file_handler {
                   2482:     my ($cmd, $tail, $client) = @_;
                   2483: 
                   2484:     my ($udom,$uname,$old,$new) = split(/:/, $tail);
                   2485:     $old=&unescape($old);
                   2486:     $new=&unescape($new);
                   2487:     if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
                   2488: 	# any files paths with /../ in them refuse to deal with
                   2489: 	&Failure($client, "refused\n", "$cmd:$tail");
                   2490:     } else {
                   2491: 	my $udir = &propath($udom,$uname);
                   2492: 	if (-e $udir) {
                   2493: 	    my $oldfile=$udir.'/userfiles/'.$old;
                   2494: 	    my $newfile=$udir.'/userfiles/'.$new;
                   2495: 	    if (-e $newfile) {
                   2496: 		&Failure($client, "exists\n", "$cmd:$tail");
                   2497: 	    } elsif (! -e $oldfile) {
                   2498: 		&Failure($client, "not_found\n", "$cmd:$tail");
                   2499: 	    } else {
                   2500: 		if (!rename($oldfile,$newfile)) {
                   2501: 		    &Failure($client, "failed\n", "$cmd:$tail");
                   2502: 		} else {
                   2503: 		    &Reply($client, "ok\n", "$cmd:$tail");
                   2504: 		}
                   2505: 	    }
                   2506: 	} else {
                   2507: 	    &Failure($client, "not_home\n", "$cmd:$tail");
                   2508: 	}
                   2509:     }
                   2510:     return 1;
                   2511: }
                   2512: &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
                   2513: 
1.227     foxr     2514: #
1.382     albertel 2515: #  Checks if the specified user has an active session on the server
                   2516: #  return ok if so, not_found if not
                   2517: #
                   2518: # Parameters:
                   2519: #   cmd      - The request keyword that dispatched to tus.
                   2520: #   tail     - The tail of the request (colon separated parameters).
                   2521: #   client   - Filehandle open on the client.
                   2522: # Return:
                   2523: #    1.
                   2524: sub user_has_session_handler {
                   2525:     my ($cmd, $tail, $client) = @_;
                   2526: 
                   2527:     my ($udom, $uname) = map { &unescape($_) } (split(/:/, $tail));
                   2528:     
                   2529:     opendir(DIR,$perlvar{'lonIDsDir'});
                   2530:     my $filename;
                   2531:     while ($filename=readdir(DIR)) {
                   2532: 	last if ($filename=~/^\Q$uname\E_\d+_\Q$udom\E_/);
                   2533:     }
                   2534:     if ($filename) {
                   2535: 	&Reply($client, "ok\n", "$cmd:$tail");
                   2536:     } else {
                   2537: 	&Failure($client, "not_found\n", "$cmd:$tail");
                   2538:     }
                   2539:     return 1;
                   2540: 
                   2541: }
                   2542: &register_handler("userhassession", \&user_has_session_handler, 0,1,0);
                   2543: 
                   2544: #
1.263     albertel 2545: #  Authenticate access to a user file by checking that the token the user's 
                   2546: #  passed also exists in their session file
1.227     foxr     2547: #
                   2548: # Parameters:
                   2549: #   cmd      - The request keyword that dispatched to tus.
                   2550: #   tail     - The tail of the request (colon separated parameters).
                   2551: #   client   - Filehandle open on the client.
                   2552: # Return:
                   2553: #    1.
                   2554: sub token_auth_user_file_handler {
                   2555:     my ($cmd, $tail, $client) = @_;
                   2556: 
                   2557:     my ($fname, $session) = split(/:/, $tail);
                   2558:     
                   2559:     chomp($session);
1.393     raeburn  2560:     my $reply="non_auth";
1.343     albertel 2561:     my $file = $perlvar{'lonIDsDir'}.'/'.$session.'.id';
                   2562:     if (open(ENVIN,"$file")) {
1.332     albertel 2563: 	flock(ENVIN,LOCK_SH);
1.343     albertel 2564: 	tie(my %disk_env,'GDBM_File',"$file",&GDBM_READER(),0640);
                   2565: 	if (exists($disk_env{"userfile.$fname"})) {
1.393     raeburn  2566: 	    $reply="ok";
1.343     albertel 2567: 	} else {
                   2568: 	    foreach my $envname (keys(%disk_env)) {
                   2569: 		if ($envname=~ m|^userfile\.\Q$fname\E|) {
1.393     raeburn  2570: 		    $reply="ok";
1.343     albertel 2571: 		    last;
                   2572: 		}
                   2573: 	    }
1.227     foxr     2574: 	}
1.343     albertel 2575: 	untie(%disk_env);
1.227     foxr     2576: 	close(ENVIN);
1.387     albertel 2577: 	&Reply($client, \$reply, "$cmd:$tail");
1.227     foxr     2578:     } else {
                   2579: 	&Failure($client, "invalid_token\n", "$cmd:$tail");
                   2580:     }
                   2581:     return 1;
                   2582: 
                   2583: }
                   2584: &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
1.229     foxr     2585: 
                   2586: #
                   2587: #   Unsubscribe from a resource.
                   2588: #
                   2589: # Parameters:
                   2590: #    $cmd      - The command that got us here.
                   2591: #    $tail     - Tail of the command (remaining parameters).
                   2592: #    $client   - File descriptor connected to client.
                   2593: # Returns
                   2594: #     0        - Requested to exit, caller should shut down.
                   2595: #     1        - Continue processing.
                   2596: #
                   2597: sub unsubscribe_handler {
                   2598:     my ($cmd, $tail, $client) = @_;
                   2599: 
                   2600:     my $userinput= "$cmd:$tail";
                   2601:     
                   2602:     my ($fname) = split(/:/,$tail); # Split in case there's extrs.
                   2603: 
                   2604:     &Debug("Unsubscribing $fname");
                   2605:     if (-e $fname) {
                   2606: 	&Debug("Exists");
                   2607: 	&Reply($client, &unsub($fname,$clientip), $userinput);
                   2608:     } else {
                   2609: 	&Failure($client, "not_found\n", $userinput);
                   2610:     }
                   2611:     return 1;
                   2612: }
                   2613: &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
1.263     albertel 2614: 
1.230     foxr     2615: #   Subscribe to a resource
                   2616: #
                   2617: # Parameters:
                   2618: #    $cmd      - The command that got us here.
                   2619: #    $tail     - Tail of the command (remaining parameters).
                   2620: #    $client   - File descriptor connected to client.
                   2621: # Returns
                   2622: #     0        - Requested to exit, caller should shut down.
                   2623: #     1        - Continue processing.
                   2624: #
                   2625: sub subscribe_handler {
                   2626:     my ($cmd, $tail, $client)= @_;
                   2627: 
                   2628:     my $userinput  = "$cmd:$tail";
                   2629: 
                   2630:     &Reply( $client, &subscribe($userinput,$clientip), $userinput);
                   2631: 
                   2632:     return 1;
                   2633: }
                   2634: &register_handler("sub", \&subscribe_handler, 0, 1, 0);
                   2635: 
                   2636: #
1.379     albertel 2637: #   Determine the latest version of a resource (it looks for the highest
                   2638: #   past version and then returns that +1)
1.230     foxr     2639: #
                   2640: # Parameters:
                   2641: #    $cmd      - The command that got us here.
                   2642: #    $tail     - Tail of the command (remaining parameters).
1.379     albertel 2643: #                 (Should consist of an absolute path to a file)
1.230     foxr     2644: #    $client   - File descriptor connected to client.
                   2645: # Returns
                   2646: #     0        - Requested to exit, caller should shut down.
                   2647: #     1        - Continue processing.
                   2648: #
                   2649: sub current_version_handler {
                   2650:     my ($cmd, $tail, $client) = @_;
                   2651: 
                   2652:     my $userinput= "$cmd:$tail";
                   2653:    
                   2654:     my $fname   = $tail;
                   2655:     &Reply( $client, &currentversion($fname)."\n", $userinput);
                   2656:     return 1;
                   2657: 
                   2658: }
                   2659: &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
                   2660: 
                   2661: #  Make an entry in a user's activity log.
                   2662: #
                   2663: # Parameters:
                   2664: #    $cmd      - The command that got us here.
                   2665: #    $tail     - Tail of the command (remaining parameters).
                   2666: #    $client   - File descriptor connected to client.
                   2667: # Returns
                   2668: #     0        - Requested to exit, caller should shut down.
                   2669: #     1        - Continue processing.
                   2670: #
                   2671: sub activity_log_handler {
                   2672:     my ($cmd, $tail, $client) = @_;
                   2673: 
                   2674: 
                   2675:     my $userinput= "$cmd:$tail";
                   2676: 
                   2677:     my ($udom,$uname,$what)=split(/:/,$tail);
                   2678:     chomp($what);
                   2679:     my $proname=&propath($udom,$uname);
                   2680:     my $now=time;
                   2681:     my $hfh;
                   2682:     if ($hfh=IO::File->new(">>$proname/activity.log")) { 
                   2683: 	print $hfh "$now:$clientname:$what\n";
                   2684: 	&Reply( $client, "ok\n", $userinput); 
                   2685:     } else {
                   2686: 	&Failure($client, "error: ".($!+0)." IO::File->new Failed "
                   2687: 		 ."while attempting log\n", 
                   2688: 		 $userinput);
                   2689:     }
                   2690: 
                   2691:     return 1;
                   2692: }
1.263     albertel 2693: &register_handler("log", \&activity_log_handler, 0, 1, 0);
1.230     foxr     2694: 
                   2695: #
                   2696: #   Put a namespace entry in a user profile hash.
                   2697: #   My druthers would be for this to be an encrypted interaction too.
                   2698: #   anything that might be an inadvertent covert channel about either
                   2699: #   user authentication or user personal information....
                   2700: #
                   2701: # Parameters:
                   2702: #    $cmd      - The command that got us here.
                   2703: #    $tail     - Tail of the command (remaining parameters).
                   2704: #    $client   - File descriptor connected to client.
                   2705: # Returns
                   2706: #     0        - Requested to exit, caller should shut down.
                   2707: #     1        - Continue processing.
                   2708: #
                   2709: sub put_user_profile_entry {
                   2710:     my ($cmd, $tail, $client)  = @_;
1.229     foxr     2711: 
1.230     foxr     2712:     my $userinput = "$cmd:$tail";
                   2713:     
1.242     raeburn  2714:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
1.230     foxr     2715:     if ($namespace ne 'roles') {
                   2716: 	chomp($what);
                   2717: 	my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2718: 				  &GDBM_WRCREAT(),"P",$what);
                   2719: 	if($hashref) {
                   2720: 	    my @pairs=split(/\&/,$what);
                   2721: 	    foreach my $pair (@pairs) {
                   2722: 		my ($key,$value)=split(/=/,$pair);
                   2723: 		$hashref->{$key}=$value;
                   2724: 	    }
1.311     albertel 2725: 	    if (&untie_user_hash($hashref)) {
1.230     foxr     2726: 		&Reply( $client, "ok\n", $userinput);
                   2727: 	    } else {
                   2728: 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                   2729: 			"while attempting put\n", 
                   2730: 			$userinput);
                   2731: 	    }
                   2732: 	} else {
1.316     albertel 2733: 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1.230     foxr     2734: 		     "while attempting put\n", $userinput);
                   2735: 	}
                   2736:     } else {
                   2737:         &Failure( $client, "refused\n", $userinput);
                   2738:     }
                   2739:     
                   2740:     return 1;
                   2741: }
                   2742: &register_handler("put", \&put_user_profile_entry, 0, 1, 0);
                   2743: 
1.283     albertel 2744: #   Put a piece of new data in hash, returns error if entry already exists
                   2745: # Parameters:
                   2746: #    $cmd      - The command that got us here.
                   2747: #    $tail     - Tail of the command (remaining parameters).
                   2748: #    $client   - File descriptor connected to client.
                   2749: # Returns
                   2750: #     0        - Requested to exit, caller should shut down.
                   2751: #     1        - Continue processing.
                   2752: #
                   2753: sub newput_user_profile_entry {
                   2754:     my ($cmd, $tail, $client)  = @_;
                   2755: 
                   2756:     my $userinput = "$cmd:$tail";
                   2757: 
                   2758:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
                   2759:     if ($namespace eq 'roles') {
                   2760:         &Failure( $client, "refused\n", $userinput);
                   2761: 	return 1;
                   2762:     }
                   2763: 
                   2764:     chomp($what);
                   2765: 
                   2766:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2767: 				 &GDBM_WRCREAT(),"N",$what);
                   2768:     if(!$hashref) {
1.316     albertel 2769: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1.283     albertel 2770: 		  "while attempting put\n", $userinput);
                   2771: 	return 1;
                   2772:     }
                   2773: 
                   2774:     my @pairs=split(/\&/,$what);
                   2775:     foreach my $pair (@pairs) {
                   2776: 	my ($key,$value)=split(/=/,$pair);
                   2777: 	if (exists($hashref->{$key})) {
                   2778: 	    &Failure($client, "key_exists: ".$key."\n",$userinput);
                   2779: 	    return 1;
                   2780: 	}
                   2781:     }
                   2782: 
                   2783:     foreach my $pair (@pairs) {
                   2784: 	my ($key,$value)=split(/=/,$pair);
                   2785: 	$hashref->{$key}=$value;
                   2786:     }
                   2787: 
1.311     albertel 2788:     if (&untie_user_hash($hashref)) {
1.283     albertel 2789: 	&Reply( $client, "ok\n", $userinput);
                   2790:     } else {
                   2791: 	&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                   2792: 		 "while attempting put\n", 
                   2793: 		 $userinput);
                   2794:     }
                   2795:     return 1;
                   2796: }
                   2797: &register_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
                   2798: 
1.230     foxr     2799: # 
                   2800: #   Increment a profile entry in the user history file.
                   2801: #   The history contains keyword value pairs.  In this case,
                   2802: #   The value itself is a pair of numbers.  The first, the current value
                   2803: #   the second an increment that this function applies to the current
                   2804: #   value.
                   2805: #
                   2806: # Parameters:
                   2807: #    $cmd      - The command that got us here.
                   2808: #    $tail     - Tail of the command (remaining parameters).
                   2809: #    $client   - File descriptor connected to client.
                   2810: # Returns
                   2811: #     0        - Requested to exit, caller should shut down.
                   2812: #     1        - Continue processing.
                   2813: #
                   2814: sub increment_user_value_handler {
                   2815:     my ($cmd, $tail, $client) = @_;
                   2816:     
                   2817:     my $userinput   = "$cmd:$tail";
                   2818:     
                   2819:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
                   2820:     if ($namespace ne 'roles') {
                   2821:         chomp($what);
                   2822: 	my $hashref = &tie_user_hash($udom, $uname,
                   2823: 				     $namespace, &GDBM_WRCREAT(),
                   2824: 				     "P",$what);
                   2825: 	if ($hashref) {
                   2826: 	    my @pairs=split(/\&/,$what);
                   2827: 	    foreach my $pair (@pairs) {
                   2828: 		my ($key,$value)=split(/=/,$pair);
1.284     raeburn  2829:                 $value = &unescape($value);
1.230     foxr     2830: 		# We could check that we have a number...
                   2831: 		if (! defined($value) || $value eq '') {
                   2832: 		    $value = 1;
                   2833: 		}
                   2834: 		$hashref->{$key}+=$value;
1.284     raeburn  2835:                 if ($namespace eq 'nohist_resourcetracker') {
                   2836:                     if ($hashref->{$key} < 0) {
                   2837:                         $hashref->{$key} = 0;
                   2838:                     }
                   2839:                 }
1.230     foxr     2840: 	    }
1.311     albertel 2841: 	    if (&untie_user_hash($hashref)) {
1.230     foxr     2842: 		&Reply( $client, "ok\n", $userinput);
                   2843: 	    } else {
                   2844: 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                   2845: 			 "while attempting inc\n", $userinput);
                   2846: 	    }
                   2847: 	} else {
                   2848: 	    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2849: 		     "while attempting inc\n", $userinput);
                   2850: 	}
                   2851:     } else {
                   2852: 	&Failure($client, "refused\n", $userinput);
                   2853:     }
                   2854:     
                   2855:     return 1;
                   2856: }
                   2857: &register_handler("inc", \&increment_user_value_handler, 0, 1, 0);
                   2858: 
                   2859: #
                   2860: #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
                   2861: #   Each 'role' a user has implies a set of permissions.  Adding a new role
                   2862: #   for a person grants the permissions packaged with that role
                   2863: #   to that user when the role is selected.
                   2864: #
                   2865: # Parameters:
                   2866: #    $cmd       - The command string (rolesput).
                   2867: #    $tail      - The remainder of the request line.  For rolesput this
                   2868: #                 consists of a colon separated list that contains:
                   2869: #                 The domain and user that is granting the role (logged).
                   2870: #                 The domain and user that is getting the role.
                   2871: #                 The roles being granted as a set of & separated pairs.
                   2872: #                 each pair a key value pair.
                   2873: #    $client    - File descriptor connected to the client.
                   2874: # Returns:
                   2875: #     0         - If the daemon should exit
                   2876: #     1         - To continue processing.
                   2877: #
                   2878: #
                   2879: sub roles_put_handler {
                   2880:     my ($cmd, $tail, $client) = @_;
                   2881: 
                   2882:     my $userinput  = "$cmd:$tail";
                   2883: 
                   2884:     my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);
                   2885:     
                   2886: 
                   2887:     my $namespace='roles';
                   2888:     chomp($what);
                   2889:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2890: 				 &GDBM_WRCREAT(), "P",
                   2891: 				 "$exedom:$exeuser:$what");
                   2892:     #
                   2893:     #  Log the attempt to set a role.  The {}'s here ensure that the file 
                   2894:     #  handle is open for the minimal amount of time.  Since the flush
                   2895:     #  is done on close this improves the chances the log will be an un-
                   2896:     #  corrupted ordered thing.
                   2897:     if ($hashref) {
1.261     foxr     2898: 	my $pass_entry = &get_auth_type($udom, $uname);
                   2899: 	my ($auth_type,$pwd)  = split(/:/, $pass_entry);
                   2900: 	$auth_type = $auth_type.":";
1.230     foxr     2901: 	my @pairs=split(/\&/,$what);
                   2902: 	foreach my $pair (@pairs) {
                   2903: 	    my ($key,$value)=split(/=/,$pair);
                   2904: 	    &manage_permissions($key, $udom, $uname,
1.260     foxr     2905: 			       $auth_type);
1.230     foxr     2906: 	    $hashref->{$key}=$value;
                   2907: 	}
1.311     albertel 2908: 	if (&untie_user_hash($hashref)) {
1.230     foxr     2909: 	    &Reply($client, "ok\n", $userinput);
                   2910: 	} else {
                   2911: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2912: 		     "while attempting rolesput\n", $userinput);
                   2913: 	}
                   2914:     } else {
                   2915: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2916: 		 "while attempting rolesput\n", $userinput);
                   2917:     }
                   2918:     return 1;
                   2919: }
                   2920: &register_handler("rolesput", \&roles_put_handler, 1,1,0);  # Encoded client only.
                   2921: 
                   2922: #
1.231     foxr     2923: #   Deletes (removes) a role for a user.   This is equivalent to removing
                   2924: #  a permissions package associated with the role from the user's profile.
                   2925: #
                   2926: # Parameters:
                   2927: #     $cmd                 - The command (rolesdel)
                   2928: #     $tail                - The remainder of the request line. This consists
                   2929: #                             of:
                   2930: #                             The domain and user requesting the change (logged)
                   2931: #                             The domain and user being changed.
                   2932: #                             The roles being revoked.  These are shipped to us
                   2933: #                             as a bunch of & separated role name keywords.
                   2934: #     $client              - The file handle open on the client.
                   2935: # Returns:
                   2936: #     1                    - Continue processing
                   2937: #     0                    - Exit.
                   2938: #
                   2939: sub roles_delete_handler {
                   2940:     my ($cmd, $tail, $client)  = @_;
                   2941: 
                   2942:     my $userinput    = "$cmd:$tail";
                   2943:    
                   2944:     my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
                   2945:     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
                   2946: 	   "what = ".$what);
                   2947:     my $namespace='roles';
                   2948:     chomp($what);
                   2949:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2950: 				 &GDBM_WRCREAT(), "D",
                   2951: 				 "$exedom:$exeuser:$what");
                   2952:     
                   2953:     if ($hashref) {
                   2954: 	my @rolekeys=split(/\&/,$what);
                   2955: 	
                   2956: 	foreach my $key (@rolekeys) {
                   2957: 	    delete $hashref->{$key};
                   2958: 	}
1.315     albertel 2959: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2960: 	    &Reply($client, "ok\n", $userinput);
                   2961: 	} else {
                   2962: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2963: 		     "while attempting rolesdel\n", $userinput);
                   2964: 	}
                   2965:     } else {
                   2966:         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2967: 		 "while attempting rolesdel\n", $userinput);
                   2968:     }
                   2969:     
                   2970:     return 1;
                   2971: }
                   2972: &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
                   2973: 
                   2974: # Unencrypted get from a user's profile database.  See 
                   2975: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
                   2976: # This function retrieves a keyed item from a specific named database in the
                   2977: # user's directory.
                   2978: #
                   2979: # Parameters:
                   2980: #   $cmd             - Command request keyword (get).
                   2981: #   $tail            - Tail of the command.  This is a colon separated list
                   2982: #                      consisting of the domain and username that uniquely
                   2983: #                      identifies the profile,
                   2984: #                      The 'namespace' which selects the gdbm file to 
                   2985: #                      do the lookup in, 
                   2986: #                      & separated list of keys to lookup.  Note that
                   2987: #                      the values are returned as an & separated list too.
                   2988: #   $client          - File descriptor open on the client.
                   2989: # Returns:
                   2990: #   1       - Continue processing.
                   2991: #   0       - Exit.
                   2992: #
                   2993: sub get_profile_entry {
                   2994:     my ($cmd, $tail, $client) = @_;
                   2995: 
                   2996:     my $userinput= "$cmd:$tail";
                   2997:    
                   2998:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
                   2999:     chomp($what);
1.255     foxr     3000: 
1.390     raeburn  3001: 
1.255     foxr     3002:     my $replystring = read_profile($udom, $uname, $namespace, $what);
                   3003:     my ($first) = split(/:/,$replystring);
                   3004:     if($first ne "error") {
1.387     albertel 3005: 	&Reply($client, \$replystring, $userinput);
1.231     foxr     3006:     } else {
1.255     foxr     3007: 	&Failure($client, $replystring." while attempting get\n", $userinput);
1.231     foxr     3008:     }
                   3009:     return 1;
1.255     foxr     3010: 
                   3011: 
1.231     foxr     3012: }
                   3013: &register_handler("get", \&get_profile_entry, 0,1,0);
                   3014: 
                   3015: #
                   3016: #  Process the encrypted get request.  Note that the request is sent
                   3017: #  in clear, but the reply is encrypted.  This is a small covert channel:
                   3018: #  information about the sensitive keys is given to the snooper.  Just not
                   3019: #  information about the values of the sensitive key.  Hmm if I wanted to
                   3020: #  know these I'd snoop for the egets. Get the profile item names from them
                   3021: #  and then issue a get for them since there's no enforcement of the
                   3022: #  requirement of an encrypted get for particular profile items.  If I
                   3023: #  were re-doing this, I'd force the request to be encrypted as well as the
                   3024: #  reply.  I'd also just enforce encrypted transactions for all gets since
                   3025: #  that would prevent any covert channel snooping.
                   3026: #
                   3027: #  Parameters:
                   3028: #     $cmd               - Command keyword of request (eget).
                   3029: #     $tail              - Tail of the command.  See GetProfileEntry
#                          for more information about this.
                   3030: #     $client            - File open on the client.
                   3031: #  Returns:
                   3032: #     1      - Continue processing
                   3033: #     0      - server should exit.
                   3034: sub get_profile_entry_encrypted {
                   3035:     my ($cmd, $tail, $client) = @_;
                   3036: 
                   3037:     my $userinput = "$cmd:$tail";
                   3038:    
1.339     albertel 3039:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
1.231     foxr     3040:     chomp($what);
1.255     foxr     3041:     my $qresult = read_profile($udom, $uname, $namespace, $what);
                   3042:     my ($first) = split(/:/, $qresult);
                   3043:     if($first ne "error") {
                   3044: 	
                   3045: 	if ($cipher) {
                   3046: 	    my $cmdlength=length($qresult);
                   3047: 	    $qresult.="         ";
                   3048: 	    my $encqresult='';
                   3049: 	    for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
                   3050: 		$encqresult.= unpack("H16", 
                   3051: 				     $cipher->encrypt(substr($qresult,
                   3052: 							     $encidx,
                   3053: 							     8)));
                   3054: 	    }
                   3055: 	    &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
                   3056: 	} else {
1.231     foxr     3057: 		&Failure( $client, "error:no_key\n", $userinput);
                   3058: 	    }
                   3059:     } else {
1.255     foxr     3060: 	&Failure($client, "$qresult while attempting eget\n", $userinput);
                   3061: 
1.231     foxr     3062:     }
                   3063:     
                   3064:     return 1;
                   3065: }
1.255     foxr     3066: &register_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
1.263     albertel 3067: 
1.231     foxr     3068: #
                   3069: #   Deletes a key in a user profile database.
                   3070: #   
                   3071: #   Parameters:
                   3072: #       $cmd                  - Command keyword (del).
                   3073: #       $tail                 - Command tail.  IN this case a colon
                   3074: #                               separated list containing:
                   3075: #                               The domain and user that identifies uniquely
                   3076: #                               the identity of the user.
                   3077: #                               The profile namespace (name of the profile
                   3078: #                               database file).
                   3079: #                               & separated list of keywords to delete.
                   3080: #       $client              - File open on client socket.
                   3081: # Returns:
                   3082: #     1   - Continue processing
                   3083: #     0   - Exit server.
                   3084: #
                   3085: #
                   3086: sub delete_profile_entry {
                   3087:     my ($cmd, $tail, $client) = @_;
                   3088: 
                   3089:     my $userinput = "cmd:$tail";
                   3090: 
                   3091:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
                   3092:     chomp($what);
                   3093:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   3094: 				 &GDBM_WRCREAT(),
                   3095: 				 "D",$what);
                   3096:     if ($hashref) {
                   3097:         my @keys=split(/\&/,$what);
                   3098: 	foreach my $key (@keys) {
                   3099: 	    delete($hashref->{$key});
                   3100: 	}
1.315     albertel 3101: 	if (&untie_user_hash($hashref)) {
1.231     foxr     3102: 	    &Reply($client, "ok\n", $userinput);
                   3103: 	} else {
                   3104: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3105: 		    "while attempting del\n", $userinput);
                   3106: 	}
                   3107:     } else {
                   3108: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3109: 		 "while attempting del\n", $userinput);
                   3110:     }
                   3111:     return 1;
                   3112: }
                   3113: &register_handler("del", \&delete_profile_entry, 0, 1, 0);
1.263     albertel 3114: 
1.231     foxr     3115: #
                   3116: #  List the set of keys that are defined in a profile database file.
                   3117: #  A successful reply from this will contain an & separated list of
                   3118: #  the keys. 
                   3119: # Parameters:
                   3120: #     $cmd              - Command request (keys).
                   3121: #     $tail             - Remainder of the request, a colon separated
                   3122: #                         list containing domain/user that identifies the
                   3123: #                         user being queried, and the database namespace
                   3124: #                         (database filename essentially).
                   3125: #     $client           - File open on the client.
                   3126: #  Returns:
                   3127: #    1    - Continue processing.
                   3128: #    0    - Exit the server.
                   3129: #
                   3130: sub get_profile_keys {
                   3131:     my ($cmd, $tail, $client) = @_;
                   3132: 
                   3133:     my $userinput = "$cmd:$tail";
                   3134: 
                   3135:     my ($udom,$uname,$namespace)=split(/:/,$tail);
                   3136:     my $qresult='';
                   3137:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   3138: 				  &GDBM_READER());
                   3139:     if ($hashref) {
                   3140: 	foreach my $key (keys %$hashref) {
                   3141: 	    $qresult.="$key&";
                   3142: 	}
1.315     albertel 3143: 	if (&untie_user_hash($hashref)) {
1.231     foxr     3144: 	    $qresult=~s/\&$//;
1.387     albertel 3145: 	    &Reply($client, \$qresult, $userinput);
1.231     foxr     3146: 	} else {
                   3147: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3148: 		    "while attempting keys\n", $userinput);
                   3149: 	}
                   3150:     } else {
                   3151: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3152: 		 "while attempting keys\n", $userinput);
                   3153:     }
                   3154:    
                   3155:     return 1;
                   3156: }
                   3157: &register_handler("keys", \&get_profile_keys, 0, 1, 0);
                   3158: 
                   3159: #
                   3160: #   Dump the contents of a user profile database.
                   3161: #   Note that this constitutes a very large covert channel too since
                   3162: #   the dump will return sensitive information that is not encrypted.
                   3163: #   The naive security assumption is that the session negotiation ensures
                   3164: #   our client is trusted and I don't believe that's assured at present.
                   3165: #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
                   3166: #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
                   3167: # 
                   3168: #  Parameters:
                   3169: #     $cmd           - The command request keyword (currentdump).
                   3170: #     $tail          - Remainder of the request, consisting of a colon
                   3171: #                      separated list that has the domain/username and
                   3172: #                      the namespace to dump (database file).
                   3173: #     $client        - file open on the remote client.
                   3174: # Returns:
                   3175: #     1    - Continue processing.
                   3176: #     0    - Exit the server.
                   3177: #
                   3178: sub dump_profile_database {
                   3179:     my ($cmd, $tail, $client) = @_;
                   3180: 
                   3181:     my $userinput = "$cmd:$tail";
                   3182:    
                   3183:     my ($udom,$uname,$namespace) = split(/:/,$tail);
                   3184:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   3185: 				 &GDBM_READER());
                   3186:     if ($hashref) {
                   3187: 	# Structure of %data:
                   3188: 	# $data{$symb}->{$parameter}=$value;
                   3189: 	# $data{$symb}->{'v.'.$parameter}=$version;
                   3190: 	# since $parameter will be unescaped, we do not
                   3191:  	# have to worry about silly parameter names...
                   3192: 	
                   3193:         my $qresult='';
                   3194: 	my %data = ();                     # A hash of anonymous hashes..
                   3195: 	while (my ($key,$value) = each(%$hashref)) {
                   3196: 	    my ($v,$symb,$param) = split(/:/,$key);
                   3197: 	    next if ($v eq 'version' || $symb eq 'keys');
                   3198: 	    next if (exists($data{$symb}) && 
                   3199: 		     exists($data{$symb}->{$param}) &&
                   3200: 		     $data{$symb}->{'v.'.$param} > $v);
                   3201: 	    $data{$symb}->{$param}=$value;
                   3202: 	    $data{$symb}->{'v.'.$param}=$v;
                   3203: 	}
1.311     albertel 3204: 	if (&untie_user_hash($hashref)) {
1.231     foxr     3205: 	    while (my ($symb,$param_hash) = each(%data)) {
                   3206: 		while(my ($param,$value) = each (%$param_hash)){
                   3207: 		    next if ($param =~ /^v\./);       # Ignore versions...
                   3208: 		    #
                   3209: 		    #   Just dump the symb=value pairs separated by &
                   3210: 		    #
                   3211: 		    $qresult.=$symb.':'.$param.'='.$value.'&';
                   3212: 		}
                   3213: 	    }
                   3214: 	    chop($qresult);
1.387     albertel 3215: 	    &Reply($client , \$qresult, $userinput);
1.231     foxr     3216: 	} else {
                   3217: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3218: 		     "while attempting currentdump\n", $userinput);
                   3219: 	}
                   3220:     } else {
                   3221: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3222: 		"while attempting currentdump\n", $userinput);
                   3223:     }
                   3224: 
                   3225:     return 1;
                   3226: }
                   3227: &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
                   3228: 
                   3229: #
                   3230: #   Dump a profile database with an optional regular expression
                   3231: #   to match against the keys.  In this dump, no effort is made
                   3232: #   to separate symb from version information. Presumably the
                   3233: #   databases that are dumped by this command are of a different
                   3234: #   structure.  Need to look at this and improve the documentation of
                   3235: #   both this and the currentdump handler.
                   3236: # Parameters:
                   3237: #    $cmd                     - The command keyword.
                   3238: #    $tail                    - All of the characters after the $cmd:
                   3239: #                               These are expected to be a colon
                   3240: #                               separated list containing:
                   3241: #                               domain/user - identifying the user.
                   3242: #                               namespace   - identifying the database.
                   3243: #                               regexp      - optional regular expression
                   3244: #                                             that is matched against
                   3245: #                                             database keywords to do
                   3246: #                                             selective dumps.
                   3247: #   $client                   - Channel open on the client.
                   3248: # Returns:
                   3249: #    1    - Continue processing.
                   3250: # Side effects:
                   3251: #    response is written to $client.
                   3252: #
                   3253: sub dump_with_regexp {
                   3254:     my ($cmd, $tail, $client) = @_;
                   3255: 
                   3256: 
                   3257:     my $userinput = "$cmd:$tail";
                   3258: 
1.450     raeburn  3259:     my ($udom,$uname,$namespace,$regexp,$range,$extra)=split(/:/,$tail);
1.231     foxr     3260:     if (defined($regexp)) {
                   3261: 	$regexp=&unescape($regexp);
                   3262:     } else {
                   3263: 	$regexp='.';
                   3264:     }
1.306     albertel 3265:     my ($start,$end);
                   3266:     if (defined($range)) {
                   3267: 	if ($range =~/^(\d+)\-(\d+)$/) {
                   3268: 	    ($start,$end) = ($1,$2);
                   3269: 	} elsif ($range =~/^(\d+)$/) {
                   3270: 	    ($start,$end) = (0,$1);
                   3271: 	} else {
                   3272: 	    undef($range);
                   3273: 	}
                   3274:     }
1.231     foxr     3275:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   3276: 				 &GDBM_READER());
1.456     raeburn  3277:     my $skipcheck;
1.231     foxr     3278:     if ($hashref) {
                   3279:         my $qresult='';
1.306     albertel 3280: 	my $count=0;
1.450     raeburn  3281:         if ($extra ne '') {
                   3282:             $extra = &Apache::lonnet::thaw_unescape($extra);
1.456     raeburn  3283:             $skipcheck = $extra->{'skipcheck'};
1.450     raeburn  3284:         }
                   3285:         my @ids = &Apache::lonnet::current_machine_ids();
1.453     raeburn  3286:         my (%homecourses,$major,$minor,$now);
1.456     raeburn  3287:         if (($namespace eq 'roles') && (!$skipcheck)) {
1.453     raeburn  3288:             my $loncaparev = $clientversion;
                   3289:             if ($loncaparev eq '') {
                   3290:                 $loncaparev = $Apache::lonnet::loncaparevs{$clientname};
                   3291:             }
                   3292:             if ($loncaparev =~ /^\'?(\d+)\.(\d+)\.[\w.\-]+\'?/) {
                   3293:                 $major = $1;
                   3294:                 $minor = $2;
                   3295:             }
                   3296:             $now = time;
                   3297:         }
1.231     foxr     3298: 	while (my ($key,$value) = each(%$hashref)) {
1.432     raeburn  3299:             if ($namespace eq 'roles') {
1.453     raeburn  3300:                 if ($key =~ m{^/($LONCAPA::match_domain)/($LONCAPA::match_courseid)(/?[^_]*)_(cc|co|in|ta|ep|ad|st|cr)$}) {
1.446     raeburn  3301:                     my $cdom = $1;
                   3302:                     my $cnum = $2;
1.456     raeburn  3303:                     unless ($skipcheck) {
1.457     raeburn  3304:                         my ($role,$end,$start) = split(/\_/,$value);
                   3305:                         if (!$end || $end > $now) {
                   3306:                             next unless (&releasereqd_check($cnum,$cdom,$key,$value,$major,
                   3307:                                                             $minor,\%homecourses,\@ids));
1.458     raeburn  3308:                         }
1.432     raeburn  3309:                     }
                   3310:                 }
                   3311:             }
1.231     foxr     3312: 	    if ($regexp eq '.') {
1.306     albertel 3313: 		$count++;
                   3314: 		if (defined($range) && $count >= $end)   { last; }
                   3315: 		if (defined($range) && $count <  $start) { next; }
1.231     foxr     3316: 		$qresult.=$key.'='.$value.'&';
                   3317: 	    } else {
                   3318: 		my $unescapeKey = &unescape($key);
                   3319: 		if (eval('$unescapeKey=~/$regexp/')) {
1.306     albertel 3320: 		    $count++;
                   3321: 		    if (defined($range) && $count >= $end)   { last; }
                   3322: 		    if (defined($range) && $count <  $start) { next; }
1.231     foxr     3323: 		    $qresult.="$key=$value&";
                   3324: 		}
                   3325: 	    }
                   3326: 	}
1.311     albertel 3327: 	if (&untie_user_hash($hashref)) {
1.456     raeburn  3328:             if (($namespace eq 'roles') && (!$skipcheck)) {
1.453     raeburn  3329:                 if (keys(%homecourses) > 0) {
                   3330:                     $qresult .= &check_homecourses(\%homecourses,$udom,$regexp,$count,
                   3331:                                                    $range,$start,$end,$major,$minor);
                   3332:                 }
                   3333:             }
1.231     foxr     3334: 	    chop($qresult);
1.387     albertel 3335: 	    &Reply($client, \$qresult, $userinput);
1.231     foxr     3336: 	} else {
                   3337: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3338: 		     "while attempting dump\n", $userinput);
                   3339: 	}
                   3340:     } else {
                   3341: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3342: 		"while attempting dump\n", $userinput);
                   3343:     }
                   3344: 
                   3345:     return 1;
                   3346: }
                   3347: &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
                   3348: 
                   3349: #  Store a set of key=value pairs associated with a versioned name.
                   3350: #
                   3351: #  Parameters:
                   3352: #    $cmd                - Request command keyword.
                   3353: #    $tail               - Tail of the request.  This is a colon
                   3354: #                          separated list containing:
                   3355: #                          domain/user - User and authentication domain.
                   3356: #                          namespace   - Name of the database being modified
                   3357: #                          rid         - Resource keyword to modify.
                   3358: #                          what        - new value associated with rid.
                   3359: #
                   3360: #    $client             - Socket open on the client.
                   3361: #
                   3362: #
                   3363: #  Returns:
                   3364: #      1 (keep on processing).
                   3365: #  Side-Effects:
                   3366: #    Writes to the client
                   3367: sub store_handler {
                   3368:     my ($cmd, $tail, $client) = @_;
                   3369:  
                   3370:     my $userinput = "$cmd:$tail";
                   3371: 
                   3372:     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
                   3373:     if ($namespace ne 'roles') {
                   3374: 
                   3375: 	chomp($what);
                   3376: 	my @pairs=split(/\&/,$what);
                   3377: 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
1.268     albertel 3378: 				       &GDBM_WRCREAT(), "S",
1.231     foxr     3379: 				       "$rid:$what");
                   3380: 	if ($hashref) {
                   3381: 	    my $now = time;
                   3382: 	    my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
                   3383: 	    my $key;
                   3384: 	    $hashref->{"version:$rid"}++;
                   3385: 	    my $version=$hashref->{"version:$rid"};
                   3386: 	    my $allkeys=''; 
                   3387: 	    foreach my $pair (@pairs) {
                   3388: 		my ($key,$value)=split(/=/,$pair);
                   3389: 		$allkeys.=$key.':';
                   3390: 		$hashref->{"$version:$rid:$key"}=$value;
                   3391: 	    }
                   3392: 	    $hashref->{"$version:$rid:timestamp"}=$now;
                   3393: 	    $allkeys.='timestamp';
                   3394: 	    $hashref->{"$version:keys:$rid"}=$allkeys;
1.311     albertel 3395: 	    if (&untie_user_hash($hashref)) {
1.231     foxr     3396: 		&Reply($client, "ok\n", $userinput);
                   3397: 	    } else {
                   3398: 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3399: 			"while attempting store\n", $userinput);
                   3400: 	    }
                   3401: 	} else {
                   3402: 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3403: 		     "while attempting store\n", $userinput);
                   3404: 	}
                   3405:     } else {
                   3406: 	&Failure($client, "refused\n", $userinput);
                   3407:     }
                   3408: 
                   3409:     return 1;
                   3410: }
                   3411: &register_handler("store", \&store_handler, 0, 1, 0);
1.263     albertel 3412: 
1.323     albertel 3413: #  Modify a set of key=value pairs associated with a versioned name.
                   3414: #
                   3415: #  Parameters:
                   3416: #    $cmd                - Request command keyword.
                   3417: #    $tail               - Tail of the request.  This is a colon
                   3418: #                          separated list containing:
                   3419: #                          domain/user - User and authentication domain.
                   3420: #                          namespace   - Name of the database being modified
                   3421: #                          rid         - Resource keyword to modify.
                   3422: #                          v           - Version item to modify
                   3423: #                          what        - new value associated with rid.
                   3424: #
                   3425: #    $client             - Socket open on the client.
                   3426: #
                   3427: #
                   3428: #  Returns:
                   3429: #      1 (keep on processing).
                   3430: #  Side-Effects:
                   3431: #    Writes to the client
                   3432: sub putstore_handler {
                   3433:     my ($cmd, $tail, $client) = @_;
                   3434:  
                   3435:     my $userinput = "$cmd:$tail";
                   3436: 
                   3437:     my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail);
                   3438:     if ($namespace ne 'roles') {
                   3439: 
                   3440: 	chomp($what);
                   3441: 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
                   3442: 				       &GDBM_WRCREAT(), "M",
                   3443: 				       "$rid:$v:$what");
                   3444: 	if ($hashref) {
                   3445: 	    my $now = time;
                   3446: 	    my %data = &hash_extract($what);
                   3447: 	    my @allkeys;
                   3448: 	    while (my($key,$value) = each(%data)) {
                   3449: 		push(@allkeys,$key);
                   3450: 		$hashref->{"$v:$rid:$key"} = $value;
                   3451: 	    }
                   3452: 	    my $allkeys = join(':',@allkeys);
                   3453: 	    $hashref->{"$v:keys:$rid"}=$allkeys;
                   3454: 
                   3455: 	    if (&untie_user_hash($hashref)) {
                   3456: 		&Reply($client, "ok\n", $userinput);
                   3457: 	    } else {
                   3458: 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3459: 			"while attempting store\n", $userinput);
                   3460: 	    }
                   3461: 	} else {
                   3462: 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3463: 		     "while attempting store\n", $userinput);
                   3464: 	}
                   3465:     } else {
                   3466: 	&Failure($client, "refused\n", $userinput);
                   3467:     }
                   3468: 
                   3469:     return 1;
                   3470: }
                   3471: &register_handler("putstore", \&putstore_handler, 0, 1, 0);
                   3472: 
                   3473: sub hash_extract {
                   3474:     my ($str)=@_;
                   3475:     my %hash;
                   3476:     foreach my $pair (split(/\&/,$str)) {
                   3477: 	my ($key,$value)=split(/=/,$pair);
                   3478: 	$hash{$key}=$value;
                   3479:     }
                   3480:     return (%hash);
                   3481: }
                   3482: sub hash_to_str {
                   3483:     my ($hash_ref)=@_;
                   3484:     my $str;
                   3485:     foreach my $key (keys(%$hash_ref)) {
                   3486: 	$str.=$key.'='.$hash_ref->{$key}.'&';
                   3487:     }
                   3488:     $str=~s/\&$//;
                   3489:     return $str;
                   3490: }
                   3491: 
1.231     foxr     3492: #
                   3493: #  Dump out all versions of a resource that has key=value pairs associated
                   3494: # with it for each version.  These resources are built up via the store
                   3495: # command.
                   3496: #
                   3497: #  Parameters:
                   3498: #     $cmd               - Command keyword.
                   3499: #     $tail              - Remainder of the request which consists of:
                   3500: #                          domain/user   - User and auth. domain.
                   3501: #                          namespace     - name of resource database.
                   3502: #                          rid           - Resource id.
                   3503: #    $client             - socket open on the client.
                   3504: #
                   3505: # Returns:
                   3506: #      1  indicating the caller should not yet exit.
                   3507: # Side-effects:
                   3508: #   Writes a reply to the client.
                   3509: #   The reply is a string of the following shape:
                   3510: #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
                   3511: #    Where the 1 above represents version 1.
                   3512: #    this continues for all pairs of keys in all versions.
                   3513: #
                   3514: #
                   3515: #    
                   3516: #
                   3517: sub restore_handler {
                   3518:     my ($cmd, $tail, $client) = @_;
                   3519: 
                   3520:     my $userinput = "$cmd:$tail";	# Only used for logging purposes.
1.351     banghart 3521:     my ($udom,$uname,$namespace,$rid) = split(/:/,$tail);
1.352     albertel 3522:     $namespace=~s/\//\_/g;
1.350     albertel 3523:     $namespace = &LONCAPA::clean_username($namespace);
1.349     albertel 3524: 
1.231     foxr     3525:     chomp($rid);
                   3526:     my $qresult='';
1.309     albertel 3527:     my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
                   3528:     if ($hashref) {
                   3529: 	my $version=$hashref->{"version:$rid"};
1.231     foxr     3530: 	$qresult.="version=$version&";
                   3531: 	my $scope;
                   3532: 	for ($scope=1;$scope<=$version;$scope++) {
1.309     albertel 3533: 	    my $vkeys=$hashref->{"$scope:keys:$rid"};
1.231     foxr     3534: 	    my @keys=split(/:/,$vkeys);
                   3535: 	    my $key;
                   3536: 	    $qresult.="$scope:keys=$vkeys&";
                   3537: 	    foreach $key (@keys) {
1.309     albertel 3538: 		$qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
1.231     foxr     3539: 	    }                                  
                   3540: 	}
1.311     albertel 3541: 	if (&untie_user_hash($hashref)) {
1.231     foxr     3542: 	    $qresult=~s/\&$//;
1.387     albertel 3543: 	    &Reply( $client, \$qresult, $userinput);
1.231     foxr     3544: 	} else {
                   3545: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3546: 		    "while attempting restore\n", $userinput);
                   3547: 	}
                   3548:     } else {
                   3549: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3550: 		"while attempting restore\n", $userinput);
                   3551:     }
                   3552:   
                   3553:     return 1;
                   3554: 
                   3555: 
                   3556: }
                   3557: &register_handler("restore", \&restore_handler, 0,1,0);
1.234     foxr     3558: 
                   3559: #
1.324     raeburn  3560: #   Add a chat message to a synchronous discussion board.
1.234     foxr     3561: #
                   3562: # Parameters:
                   3563: #    $cmd                - Request keyword.
                   3564: #    $tail               - Tail of the command. A colon separated list
                   3565: #                          containing:
                   3566: #                          cdom    - Domain on which the chat board lives
1.324     raeburn  3567: #                          cnum    - Course containing the chat board.
                   3568: #                          newpost - Body of the posting.
                   3569: #                          group   - Optional group, if chat board is only 
                   3570: #                                    accessible in a group within the course 
1.234     foxr     3571: #   $client              - Socket open on the client.
                   3572: # Returns:
                   3573: #   1    - Indicating caller should keep on processing.
                   3574: #
                   3575: # Side-effects:
                   3576: #   writes a reply to the client.
                   3577: #
                   3578: #
                   3579: sub send_chat_handler {
                   3580:     my ($cmd, $tail, $client) = @_;
                   3581: 
                   3582:     
                   3583:     my $userinput = "$cmd:$tail";
                   3584: 
1.324     raeburn  3585:     my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail);
                   3586:     &chat_add($cdom,$cnum,$newpost,$group);
1.234     foxr     3587:     &Reply($client, "ok\n", $userinput);
                   3588: 
                   3589:     return 1;
                   3590: }
                   3591: &register_handler("chatsend", \&send_chat_handler, 0, 1, 0);
1.263     albertel 3592: 
1.234     foxr     3593: #
1.324     raeburn  3594: #   Retrieve the set of chat messages from a discussion board.
1.234     foxr     3595: #
                   3596: #  Parameters:
                   3597: #    $cmd             - Command keyword that initiated the request.
                   3598: #    $tail            - Remainder of the request after the command
                   3599: #                       keyword.  In this case a colon separated list of
                   3600: #                       chat domain    - Which discussion board.
                   3601: #                       chat id        - Discussion thread(?)
                   3602: #                       domain/user    - Authentication domain and username
                   3603: #                                        of the requesting person.
1.324     raeburn  3604: #                       group          - Optional course group containing
                   3605: #                                        the board.      
1.234     foxr     3606: #   $client           - Socket open on the client program.
                   3607: # Returns:
                   3608: #    1     - continue processing
                   3609: # Side effects:
                   3610: #    Response is written to the client.
                   3611: #
                   3612: sub retrieve_chat_handler {
                   3613:     my ($cmd, $tail, $client) = @_;
                   3614: 
                   3615: 
                   3616:     my $userinput = "$cmd:$tail";
                   3617: 
1.324     raeburn  3618:     my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
1.234     foxr     3619:     my $reply='';
1.324     raeburn  3620:     foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
1.234     foxr     3621: 	$reply.=&escape($_).':';
                   3622:     }
                   3623:     $reply=~s/\:$//;
1.387     albertel 3624:     &Reply($client, \$reply, $userinput);
1.234     foxr     3625: 
                   3626: 
                   3627:     return 1;
                   3628: }
                   3629: &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
                   3630: 
                   3631: #
                   3632: #  Initiate a query of an sql database.  SQL query repsonses get put in
                   3633: #  a file for later retrieval.  This prevents sql query results from
                   3634: #  bottlenecking the system.  Note that with loncnew, perhaps this is
                   3635: #  less of an issue since multiple outstanding requests can be concurrently
                   3636: #  serviced.
                   3637: #
                   3638: #  Parameters:
                   3639: #     $cmd       - COmmand keyword that initiated the request.
                   3640: #     $tail      - Remainder of the command after the keyword.
                   3641: #                  For this function, this consists of a query and
                   3642: #                  3 arguments that are self-documentingly labelled
                   3643: #                  in the original arg1, arg2, arg3.
                   3644: #     $client    - Socket open on the client.
                   3645: # Return:
                   3646: #    1   - Indicating processing should continue.
                   3647: # Side-effects:
                   3648: #    a reply is written to $client.
                   3649: #
                   3650: sub send_query_handler {
                   3651:     my ($cmd, $tail, $client) = @_;
                   3652: 
                   3653: 
                   3654:     my $userinput = "$cmd:$tail";
                   3655: 
                   3656:     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
                   3657:     $query=~s/\n*$//g;
                   3658:     &Reply($client, "". &sql_reply("$clientname\&$query".
                   3659: 				"\&$arg1"."\&$arg2"."\&$arg3")."\n",
                   3660: 	  $userinput);
                   3661:     
                   3662:     return 1;
                   3663: }
                   3664: &register_handler("querysend", \&send_query_handler, 0, 1, 0);
                   3665: 
                   3666: #
                   3667: #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
                   3668: #   The query is submitted via a "querysend" transaction.
                   3669: #   There it is passed on to the lonsql daemon, queued and issued to
                   3670: #   mysql.
                   3671: #     This transaction is invoked when the sql transaction is complete
                   3672: #   it stores the query results in flie and indicates query completion.
                   3673: #   presumably local software then fetches this response... I'm guessing
                   3674: #   the sequence is: lonc does a querysend, we ask lonsql to do it.
                   3675: #   lonsql on completion of the query interacts with the lond of our
                   3676: #   client to do a query reply storing two files:
                   3677: #    - id     - The results of the query.
                   3678: #    - id.end - Indicating the transaction completed. 
                   3679: #    NOTE: id is a unique id assigned to the query and querysend time.
                   3680: # Parameters:
                   3681: #    $cmd        - Command keyword that initiated this request.
                   3682: #    $tail       - Remainder of the tail.  In this case that's a colon
                   3683: #                  separated list containing the query Id and the 
                   3684: #                  results of the query.
                   3685: #    $client     - Socket open on the client.
                   3686: # Return:
                   3687: #    1           - Indicating that we should continue processing.
                   3688: # Side effects:
                   3689: #    ok written to the client.
                   3690: #
                   3691: sub reply_query_handler {
                   3692:     my ($cmd, $tail, $client) = @_;
                   3693: 
                   3694: 
                   3695:     my $userinput = "$cmd:$tail";
                   3696: 
1.339     albertel 3697:     my ($id,$reply)=split(/:/,$tail); 
1.234     foxr     3698:     my $store;
                   3699:     my $execdir=$perlvar{'lonDaemons'};
                   3700:     if ($store=IO::File->new(">$execdir/tmp/$id")) {
                   3701: 	$reply=~s/\&/\n/g;
                   3702: 	print $store $reply;
                   3703: 	close $store;
                   3704: 	my $store2=IO::File->new(">$execdir/tmp/$id.end");
                   3705: 	print $store2 "done\n";
                   3706: 	close $store2;
                   3707: 	&Reply($client, "ok\n", $userinput);
                   3708:     } else {
                   3709: 	&Failure($client, "error: ".($!+0)
                   3710: 		." IO::File->new Failed ".
                   3711: 		"while attempting queryreply\n", $userinput);
                   3712:     }
                   3713:  
                   3714: 
                   3715:     return 1;
                   3716: }
                   3717: &register_handler("queryreply", \&reply_query_handler, 0, 1, 0);
                   3718: 
                   3719: #
                   3720: #  Process the courseidput request.  Not quite sure what this means
                   3721: #  at the system level sense.  It appears a gdbm file in the 
                   3722: #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
                   3723: #  a set of entries made in that database.
                   3724: #
                   3725: # Parameters:
                   3726: #   $cmd      - The command keyword that initiated this request.
                   3727: #   $tail     - Tail of the command.  In this case consists of a colon
                   3728: #               separated list contaning the domain to apply this to and
                   3729: #               an ampersand separated list of keyword=value pairs.
1.272     raeburn  3730: #               Each value is a colon separated list that includes:  
                   3731: #               description, institutional code and course owner.
                   3732: #               For backward compatibility with versions included
                   3733: #               in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
                   3734: #               code and/or course owner are preserved from the existing 
                   3735: #               record when writing a new record in response to 1.1 or 
                   3736: #               1.2 implementations of lonnet::flushcourselogs().   
                   3737: #                      
1.234     foxr     3738: #   $client   - Socket open on the client.
                   3739: # Returns:
                   3740: #   1    - indicating that processing should continue
                   3741: #
                   3742: # Side effects:
                   3743: #   reply is written to the client.
                   3744: #
                   3745: sub put_course_id_handler {
                   3746:     my ($cmd, $tail, $client) = @_;
                   3747: 
                   3748: 
                   3749:     my $userinput = "$cmd:$tail";
                   3750: 
1.266     raeburn  3751:     my ($udom, $what) = split(/:/, $tail,2);
1.234     foxr     3752:     chomp($what);
                   3753:     my $now=time;
                   3754:     my @pairs=split(/\&/,$what);
                   3755: 
                   3756:     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
                   3757:     if ($hashref) {
                   3758: 	foreach my $pair (@pairs) {
1.271     raeburn  3759:             my ($key,$courseinfo) = split(/=/,$pair,2);
                   3760:             $courseinfo =~ s/=/:/g;
1.384     raeburn  3761:             if (defined($hashref->{$key})) {
                   3762:                 my $value = &Apache::lonnet::thaw_unescape($hashref->{$key});
                   3763:                 if (ref($value) eq 'HASH') {
                   3764:                     my @items = ('description','inst_code','owner','type');
                   3765:                     my @new_items = split(/:/,$courseinfo,-1);
                   3766:                     my %storehash; 
                   3767:                     for (my $i=0; $i<@new_items; $i++) {
1.391     raeburn  3768:                         $storehash{$items[$i]} = &unescape($new_items[$i]);
1.384     raeburn  3769:                     }
                   3770:                     $hashref->{$key} = 
                   3771:                         &Apache::lonnet::freeze_escape(\%storehash);
                   3772:                     my $unesc_key = &unescape($key);
                   3773:                     $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
                   3774:                     next;
1.383     raeburn  3775:                 }
1.384     raeburn  3776:             }
                   3777:             my @current_items = split(/:/,$hashref->{$key},-1);
                   3778:             shift(@current_items); # remove description
                   3779:             pop(@current_items);   # remove last access
                   3780:             my $numcurrent = scalar(@current_items);
                   3781:             if ($numcurrent > 3) {
                   3782:                 $numcurrent = 3;
                   3783:             }
                   3784:             my @new_items = split(/:/,$courseinfo,-1);
                   3785:             my $numnew = scalar(@new_items);
                   3786:             if ($numcurrent > 0) {
                   3787:                 if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2 
                   3788:                     for (my $j=$numcurrent-$numnew; $j>=0; $j--) {
                   3789:                         $courseinfo .= ':'.$current_items[$numcurrent-$j-1];
1.333     raeburn  3790:                     }
1.272     raeburn  3791:                 }
                   3792:             }
1.384     raeburn  3793:             $hashref->{$key}=$courseinfo.':'.$now;
1.234     foxr     3794: 	}
1.311     albertel 3795: 	if (&untie_domain_hash($hashref)) {
1.253     foxr     3796: 	    &Reply( $client, "ok\n", $userinput);
1.234     foxr     3797: 	} else {
1.253     foxr     3798: 	    &Failure($client, "error: ".($!+0)
1.234     foxr     3799: 		     ." untie(GDBM) Failed ".
                   3800: 		     "while attempting courseidput\n", $userinput);
                   3801: 	}
                   3802:     } else {
1.253     foxr     3803: 	&Failure($client, "error: ".($!+0)
1.234     foxr     3804: 		 ." tie(GDBM) Failed ".
                   3805: 		 "while attempting courseidput\n", $userinput);
                   3806:     }
                   3807: 
                   3808:     return 1;
                   3809: }
                   3810: &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
                   3811: 
1.383     raeburn  3812: sub put_course_id_hash_handler {
                   3813:     my ($cmd, $tail, $client) = @_;
                   3814:     my $userinput = "$cmd:$tail";
1.384     raeburn  3815:     my ($udom,$mode,$what) = split(/:/, $tail,3);
1.383     raeburn  3816:     chomp($what);
                   3817:     my $now=time;
                   3818:     my @pairs=split(/\&/,$what);
1.384     raeburn  3819:     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
1.383     raeburn  3820:     if ($hashref) {
                   3821:         foreach my $pair (@pairs) {
                   3822:             my ($key,$value)=split(/=/,$pair);
1.384     raeburn  3823:             my $unesc_key = &unescape($key);
                   3824:             if ($mode ne 'timeonly') {
                   3825:                 if (!defined($hashref->{&escape('lasttime:'.$unesc_key)})) {
                   3826:                     my $curritems = &Apache::lonnet::thaw_unescape($key); 
                   3827:                     if (ref($curritems) ne 'HASH') {
                   3828:                         my @current_items = split(/:/,$hashref->{$key},-1);
                   3829:                         my $lasttime = pop(@current_items);
                   3830:                         $hashref->{&escape('lasttime:'.$unesc_key)} = $lasttime;
                   3831:                     } else {
                   3832:                         $hashref->{&escape('lasttime:'.$unesc_key)} = '';
                   3833:                     }
                   3834:                 } 
                   3835:                 $hashref->{$key} = $value;
                   3836:             }
                   3837:             if ($mode ne 'notime') {
                   3838:                 $hashref->{&escape('lasttime:'.$unesc_key)} = $now;
                   3839:             }
1.383     raeburn  3840:         }
                   3841:         if (&untie_domain_hash($hashref)) {
                   3842:             &Reply($client, "ok\n", $userinput);
                   3843:         } else {
                   3844:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3845:                      "while attempting courseidputhash\n", $userinput);
                   3846:         }
                   3847:     } else {
                   3848:         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3849:                   "while attempting courseidputhash\n", $userinput);
                   3850:     }
                   3851:     return 1;
                   3852: }
                   3853: &register_handler("courseidputhash", \&put_course_id_hash_handler, 0, 1, 0);
                   3854: 
1.234     foxr     3855: #  Retrieves the value of a course id resource keyword pattern
                   3856: #  defined since a starting date.  Both the starting date and the
                   3857: #  keyword pattern are optional.  If the starting date is not supplied it
                   3858: #  is treated as the beginning of time.  If the pattern is not found,
                   3859: #  it is treatred as "." matching everything.
                   3860: #
                   3861: #  Parameters:
                   3862: #     $cmd     - Command keyword that resulted in us being dispatched.
                   3863: #     $tail    - The remainder of the command that, in this case, consists
                   3864: #                of a colon separated list of:
                   3865: #                 domain   - The domain in which the course database is 
                   3866: #                            defined.
                   3867: #                 since    - Optional parameter describing the minimum
                   3868: #                            time of definition(?) of the resources that
                   3869: #                            will match the dump.
                   3870: #                 description - regular expression that is used to filter
                   3871: #                            the dump.  Only keywords matching this regexp
                   3872: #                            will be used.
1.272     raeburn  3873: #                 institutional code - optional supplied code to filter 
                   3874: #                            the dump. Only courses with an institutional code 
                   3875: #                            that match the supplied code will be returned.
1.336     raeburn  3876: #                 owner    - optional supplied username and domain of owner to
                   3877: #                            filter the dump.  Only courses for which the course
                   3878: #                            owner matches the supplied username and/or domain
                   3879: #                            will be returned. Pre-2.2.0 legacy entries from 
                   3880: #                            nohist_courseiddump will only contain usernames.
1.384     raeburn  3881: #                 type     - optional parameter for selection 
1.418     raeburn  3882: #                 regexp_ok - if 1 or -1 allow the supplied institutional code
                   3883: #                            filter to behave as a regular expression:
                   3884: #	                      1 will not exclude the course if the instcode matches the RE 
                   3885: #                            -1 will exclude the course if the instcode matches the RE
1.384     raeburn  3886: #                 rtn_as_hash - whether to return the information available for
                   3887: #                            each matched item as a frozen hash of all 
                   3888: #                            key, value pairs in the item's hash, or as a 
                   3889: #                            colon-separated list of (in order) description,
                   3890: #                            institutional code, and course owner.
1.404     raeburn  3891: #                 selfenrollonly - filter by courses allowing self-enrollment  
                   3892: #                                  now or in the future (selfenrollonly = 1).
                   3893: #                 catfilter - filter by course category, assigned to a course 
                   3894: #                             using manually defined categories (i.e., not
1.407     raeburn  3895: #                             self-cataloging based on on institutional code).   
1.404     raeburn  3896: #                 showhidden - include course in results even if course  
1.407     raeburn  3897: #                              was set to be excluded from course catalog (DC only).
1.404     raeburn  3898: #                 caller -  if set to 'coursecatalog', courses set to be hidden
                   3899: #                           from course catalog will be excluded from results (unless
                   3900: #                           overridden by "showhidden".
1.427     raeburn  3901: #                 cloner - escaped username:domain of course cloner (if picking course to
1.419     raeburn  3902: #                          clone).
                   3903: #                 cc_clone_list - escaped comma separated list of courses for which 
                   3904: #                                 course cloner has active CC role (and so can clone
                   3905: #                                 automatically).
1.427     raeburn  3906: #                 cloneonly - filter by courses for which cloner has rights to clone.
                   3907: #                 createdbefore - include courses for which creation date preceeded this date.
                   3908: #                 createdafter - include courses for which creation date followed this date.
                   3909: #                 creationcontext - include courses created in specified context 
1.404     raeburn  3910: #
1.445     raeburn  3911: #                 domcloner - flag to indicate if user can create CCs in course's domain.
                   3912: #                             If so, ability to clone course is automatic. 
                   3913: #
1.234     foxr     3914: #     $client  - The socket open on the client.
                   3915: # Returns:
                   3916: #    1     - Continue processing.
                   3917: # Side Effects:
                   3918: #   a reply is written to $client.
                   3919: sub dump_course_id_handler {
                   3920:     my ($cmd, $tail, $client) = @_;
                   3921:     my $userinput = "$cmd:$tail";
                   3922: 
1.333     raeburn  3923:     my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
1.404     raeburn  3924:         $typefilter,$regexp_ok,$rtn_as_hash,$selfenrollonly,$catfilter,$showhidden,
1.427     raeburn  3925:         $caller,$cloner,$cc_clone_list,$cloneonly,$createdbefore,$createdafter,
1.445     raeburn  3926:         $creationcontext,$domcloner) =split(/:/,$tail);
1.397     raeburn  3927:     my $now = time;
1.419     raeburn  3928:     my ($cloneruname,$clonerudom,%cc_clone);
1.234     foxr     3929:     if (defined($description)) {
                   3930: 	$description=&unescape($description);
                   3931:     } else {
                   3932: 	$description='.';
                   3933:     }
1.266     raeburn  3934:     if (defined($instcodefilter)) {
                   3935:         $instcodefilter=&unescape($instcodefilter);
                   3936:     } else {
                   3937:         $instcodefilter='.';
                   3938:     }
1.336     raeburn  3939:     my ($ownerunamefilter,$ownerdomfilter);
1.266     raeburn  3940:     if (defined($ownerfilter)) {
                   3941:         $ownerfilter=&unescape($ownerfilter);
1.336     raeburn  3942:         if ($ownerfilter ne '.' && defined($ownerfilter)) {
                   3943:             if ($ownerfilter =~ /^([^:]*):([^:]*)$/) {
                   3944:                  $ownerunamefilter = $1;
                   3945:                  $ownerdomfilter = $2;
                   3946:             } else {
                   3947:                 $ownerunamefilter = $ownerfilter;
                   3948:                 $ownerdomfilter = '';
                   3949:             }
                   3950:         }
1.266     raeburn  3951:     } else {
                   3952:         $ownerfilter='.';
                   3953:     }
1.336     raeburn  3954: 
1.282     raeburn  3955:     if (defined($coursefilter)) {
                   3956:         $coursefilter=&unescape($coursefilter);
                   3957:     } else {
                   3958:         $coursefilter='.';
                   3959:     }
1.333     raeburn  3960:     if (defined($typefilter)) {
                   3961:         $typefilter=&unescape($typefilter);
                   3962:     } else {
                   3963:         $typefilter='.';
                   3964:     }
1.344     raeburn  3965:     if (defined($regexp_ok)) {
                   3966:         $regexp_ok=&unescape($regexp_ok);
                   3967:     }
1.401     raeburn  3968:     if (defined($catfilter)) {
                   3969:         $catfilter=&unescape($catfilter);
                   3970:     }
1.419     raeburn  3971:     if (defined($cloner)) {
                   3972:         $cloner = &unescape($cloner);
                   3973:         ($cloneruname,$clonerudom) = ($cloner =~ /^($LONCAPA::match_username):($LONCAPA::match_domain)$/); 
                   3974:     }
                   3975:     if (defined($cc_clone_list)) {
                   3976:         $cc_clone_list = &unescape($cc_clone_list);
                   3977:         my @cc_cloners = split('&',$cc_clone_list);
                   3978:         foreach my $cid (@cc_cloners) {
                   3979:             my ($clonedom,$clonenum) = split(':',$cid);
                   3980:             next if ($clonedom ne $udom); 
                   3981:             $cc_clone{$clonedom.'_'.$clonenum} = 1;
                   3982:         } 
                   3983:     }
1.431     raeburn  3984:     if ($createdbefore ne '') {
1.427     raeburn  3985:         $createdbefore = &unescape($createdbefore);
                   3986:     } else {
                   3987:        $createdbefore = 0;
                   3988:     }
1.431     raeburn  3989:     if ($createdafter ne '') {
1.427     raeburn  3990:         $createdafter = &unescape($createdafter);
                   3991:     } else {
                   3992:         $createdafter = 0;
                   3993:     }
1.431     raeburn  3994:     if ($creationcontext ne '') {
1.427     raeburn  3995:         $creationcontext = &unescape($creationcontext);
                   3996:     } else {
                   3997:         $creationcontext = '.';
                   3998:     }
1.384     raeburn  3999:     my $unpack = 1;
                   4000:     if ($description eq '.' && $instcodefilter eq '.' && $coursefilter eq '.' && 
                   4001:         $typefilter eq '.') {
                   4002:         $unpack = 0;
                   4003:     }
                   4004:     if (!defined($since)) { $since=0; }
1.234     foxr     4005:     my $qresult='';
                   4006:     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
                   4007:     if ($hashref) {
1.384     raeburn  4008: 	while (my ($key,$value) = each(%$hashref)) {
1.397     raeburn  4009:             my ($unesc_key,$lasttime_key,$lasttime,$is_hash,%val,
1.427     raeburn  4010:                 %unesc_val,$selfenroll_end,$selfenroll_types,$created,
                   4011:                 $context);
1.384     raeburn  4012:             $unesc_key = &unescape($key);
                   4013:             if ($unesc_key =~ /^lasttime:/) {
                   4014:                 next;
                   4015:             } else {
                   4016:                 $lasttime_key = &escape('lasttime:'.$unesc_key);
                   4017:             }
                   4018:             if ($hashref->{$lasttime_key} ne '') {
                   4019:                 $lasttime = $hashref->{$lasttime_key};
                   4020:                 next if ($lasttime<$since);
                   4021:             }
1.419     raeburn  4022:             my ($canclone,$valchange);
1.384     raeburn  4023:             my $items = &Apache::lonnet::thaw_unescape($value);
                   4024:             if (ref($items) eq 'HASH') {
1.429     raeburn  4025:                 if ($hashref->{$lasttime_key} eq '') {
1.430     raeburn  4026:                     next if ($since > 1);
1.429     raeburn  4027:                 }
1.384     raeburn  4028:                 $is_hash =  1;
1.445     raeburn  4029:                 if ($domcloner) {
                   4030:                     $canclone = 1;
                   4031:                 } elsif (defined($clonerudom)) {
1.419     raeburn  4032:                     if ($items->{'cloners'}) {
                   4033:                         my @cloneable = split(',',$items->{'cloners'});
                   4034:                         if (@cloneable) {
                   4035:                             if (grep(/^\*$/,@cloneable))  {
                   4036:                                 $canclone = 1;
                   4037:                             } elsif (grep(/^\*:\Q$clonerudom\E$/,@cloneable)) {
                   4038:                                 $canclone = 1;
                   4039:                             } elsif (grep(/^\Q$cloneruname\E:\Q$clonerudom\E$/,@cloneable)) {
                   4040:                                 $canclone = 1;
                   4041:                             }
                   4042:                         }
                   4043:                         unless ($canclone) {
                   4044:                             if ($cloneruname ne '' && $clonerudom ne '') {
                   4045:                                 if ($cc_clone{$unesc_key}) {
                   4046:                                     $canclone = 1;
                   4047:                                     $items->{'cloners'} .= ','.$cloneruname.':'.
                   4048:                                                            $clonerudom;
                   4049:                                     $valchange = 1;
                   4050:                                 }
                   4051:                             }
                   4052:                         }
                   4053:                     } elsif (defined($cloneruname)) {
                   4054:                         if ($cc_clone{$unesc_key}) {
                   4055:                             $canclone = 1;
                   4056:                             $items->{'cloners'} = $cloneruname.':'.$clonerudom;
                   4057:                             $valchange = 1;
                   4058:                         }
1.437     raeburn  4059:                         unless ($canclone) {
                   4060:                             if ($items->{'owner'} =~ /:/) {
                   4061:                                 if ($items->{'owner'} eq $cloner) {
                   4062:                                     $canclone = 1;
                   4063:                                 }
1.444     raeburn  4064:                             } elsif ($cloner eq $items->{'owner'}.':'.$udom) {
1.437     raeburn  4065:                                 $canclone = 1;
                   4066:                             }
                   4067:                             if ($canclone) {
                   4068:                                 $items->{'cloners'} = $cloneruname.':'.$clonerudom;
                   4069:                                 $valchange = 1;
                   4070:                             }
                   4071:                         }
1.419     raeburn  4072:                     }
                   4073:                 }
1.384     raeburn  4074:                 if ($unpack || !$rtn_as_hash) {
                   4075:                     $unesc_val{'descr'} = $items->{'description'};
                   4076:                     $unesc_val{'inst_code'} = $items->{'inst_code'};
                   4077:                     $unesc_val{'owner'} = $items->{'owner'};
                   4078:                     $unesc_val{'type'} = $items->{'type'};
1.419     raeburn  4079:                     $unesc_val{'cloners'} = $items->{'cloners'};
1.427     raeburn  4080:                     $unesc_val{'created'} = $items->{'created'};
                   4081:                     $unesc_val{'context'} = $items->{'context'};
1.404     raeburn  4082:                 }
                   4083:                 $selfenroll_types = $items->{'selfenroll_types'};
                   4084:                 $selfenroll_end = $items->{'selfenroll_end_date'};
1.427     raeburn  4085:                 $created = $items->{'created'};
                   4086:                 $context = $items->{'context'};
1.404     raeburn  4087:                 if ($selfenrollonly) {
                   4088:                     next if (!$selfenroll_types);
                   4089:                     if (($selfenroll_end > 0) && ($selfenroll_end <= $now)) {
                   4090:                         next;
1.397     raeburn  4091:                     }
1.404     raeburn  4092:                 }
1.427     raeburn  4093:                 if ($creationcontext ne '.') {
                   4094:                     next if (($context ne '') && ($context ne $creationcontext));  
                   4095:                 }
                   4096:                 if ($createdbefore > 0) {
                   4097:                     next if (($created eq '') || ($created > $createdbefore));   
                   4098:                 }
                   4099:                 if ($createdafter > 0) {
                   4100:                     next if (($created eq '') || ($created <= $createdafter)); 
                   4101:                 }
1.404     raeburn  4102:                 if ($catfilter ne '') {
1.406     raeburn  4103:                     next if ($items->{'categories'} eq '');
                   4104:                     my @categories = split('&',$items->{'categories'}); 
1.407     raeburn  4105:                     next if (@categories == 0);
                   4106:                     my @subcats = split('&',$catfilter);
                   4107:                     my $matchcat = 0;
                   4108:                     foreach my $cat (@categories) {
                   4109:                         if (grep(/^\Q$cat\E$/,@subcats)) {
                   4110:                             $matchcat = 1;
                   4111:                             last;
                   4112:                         }
                   4113:                     }
                   4114:                     next if (!$matchcat);
1.404     raeburn  4115:                 }
                   4116:                 if ($caller eq 'coursecatalog') {
1.405     raeburn  4117:                     if ($items->{'hidefromcat'} eq 'yes') {
                   4118:                         next if !$showhidden;
1.401     raeburn  4119:                     }
1.384     raeburn  4120:                 }
1.383     raeburn  4121:             } else {
1.401     raeburn  4122:                 next if ($catfilter ne '');
1.419     raeburn  4123:                 next if ($selfenrollonly);
1.427     raeburn  4124:                 next if ($createdbefore || $createdafter);
                   4125:                 next if ($creationcontext ne '.');
1.419     raeburn  4126:                 if ((defined($clonerudom)) && (defined($cloneruname)))  {
                   4127:                     if ($cc_clone{$unesc_key}) {
                   4128:                         $canclone = 1;
                   4129:                         $val{'cloners'} = &escape($cloneruname.':'.$clonerudom);
                   4130:                     }
                   4131:                 }
1.384     raeburn  4132:                 $is_hash =  0;
1.388     raeburn  4133:                 my @courseitems = split(/:/,$value);
1.403     raeburn  4134:                 $lasttime = pop(@courseitems);
1.402     raeburn  4135:                 if ($hashref->{$lasttime_key} eq '') {
                   4136:                     next if ($lasttime<$since);
                   4137:                 }
1.384     raeburn  4138: 	        ($val{'descr'},$val{'inst_code'},$val{'owner'},$val{'type'}) = @courseitems;
1.383     raeburn  4139:             }
1.419     raeburn  4140:             if ($cloneonly) {
                   4141:                next unless ($canclone);
                   4142:             }
1.266     raeburn  4143:             my $match = 1;
1.384     raeburn  4144: 	    if ($description ne '.') {
                   4145:                 if (!$is_hash) {
                   4146:                     $unesc_val{'descr'} = &unescape($val{'descr'});
                   4147:                 }
                   4148:                 if (eval{$unesc_val{'descr'} !~ /\Q$description\E/i}) {
1.266     raeburn  4149:                     $match = 0;
1.384     raeburn  4150:                 }
1.266     raeburn  4151:             }
1.384     raeburn  4152:             if ($instcodefilter ne '.') {
                   4153:                 if (!$is_hash) {
                   4154:                     $unesc_val{'inst_code'} = &unescape($val{'inst_code'});
                   4155:                 }
1.418     raeburn  4156:                 if ($regexp_ok == 1) {
1.384     raeburn  4157:                     if (eval{$unesc_val{'inst_code'} !~ /$instcodefilter/}) {
1.344     raeburn  4158:                         $match = 0;
                   4159:                     }
1.418     raeburn  4160:                 } elsif ($regexp_ok == -1) {
                   4161:                     if (eval{$unesc_val{'inst_code'} =~ /$instcodefilter/}) {
                   4162:                         $match = 0;
                   4163:                     }
1.344     raeburn  4164:                 } else {
1.384     raeburn  4165:                     if (eval{$unesc_val{'inst_code'} !~ /\Q$instcodefilter\E/i}) {
1.344     raeburn  4166:                         $match = 0;
                   4167:                     }
1.266     raeburn  4168:                 }
1.234     foxr     4169: 	    }
1.384     raeburn  4170:             if ($ownerfilter ne '.') {
                   4171:                 if (!$is_hash) {
                   4172:                     $unesc_val{'owner'} = &unescape($val{'owner'});
                   4173:                 }
1.336     raeburn  4174:                 if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) {
1.384     raeburn  4175:                     if ($unesc_val{'owner'} =~ /:/) {
                   4176:                         if (eval{$unesc_val{'owner'} !~ 
                   4177:                              /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i}) {
1.336     raeburn  4178:                             $match = 0;
                   4179:                         } 
                   4180:                     } else {
1.384     raeburn  4181:                         if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
1.336     raeburn  4182:                             $match = 0;
                   4183:                         }
                   4184:                     }
                   4185:                 } elsif ($ownerunamefilter ne '') {
1.384     raeburn  4186:                     if ($unesc_val{'owner'} =~ /:/) {
                   4187:                         if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E:[^:]+$/i}) {
1.336     raeburn  4188:                              $match = 0;
                   4189:                         }
                   4190:                     } else {
1.384     raeburn  4191:                         if (eval{$unesc_val{'owner'} !~ /\Q$ownerunamefilter\E/i}) {
1.336     raeburn  4192:                             $match = 0;
                   4193:                         }
                   4194:                     }
                   4195:                 } elsif ($ownerdomfilter ne '') {
1.384     raeburn  4196:                     if ($unesc_val{'owner'} =~ /:/) {
                   4197:                         if (eval{$unesc_val{'owner'} !~ /^[^:]+:\Q$ownerdomfilter\E/}) {
1.336     raeburn  4198:                              $match = 0;
                   4199:                         }
                   4200:                     } else {
                   4201:                         if ($ownerdomfilter ne $udom) {
                   4202:                             $match = 0;
                   4203:                         }
                   4204:                     }
1.266     raeburn  4205:                 }
                   4206:             }
1.384     raeburn  4207:             if ($coursefilter ne '.') {
                   4208:                 if (eval{$unesc_key !~ /^$udom(_)\Q$coursefilter\E$/}) {
1.282     raeburn  4209:                     $match = 0;
                   4210:                 }
                   4211:             }
1.384     raeburn  4212:             if ($typefilter ne '.') {
                   4213:                 if (!$is_hash) {
                   4214:                     $unesc_val{'type'} = &unescape($val{'type'});
                   4215:                 }
                   4216:                 if ($unesc_val{'type'} eq '') {
1.333     raeburn  4217:                     if ($typefilter ne 'Course') {
                   4218:                         $match = 0;
                   4219:                     }
1.383     raeburn  4220:                 } else {
1.384     raeburn  4221:                     if (eval{$unesc_val{'type'} !~ /^\Q$typefilter\E$/}) {
1.333     raeburn  4222:                         $match = 0;
                   4223:                     }
                   4224:                 }
                   4225:             }
1.266     raeburn  4226:             if ($match == 1) {
1.384     raeburn  4227:                 if ($rtn_as_hash) {
                   4228:                     if ($is_hash) {
1.419     raeburn  4229:                         if ($valchange) {
                   4230:                             my $newvalue = &Apache::lonnet::freeze_escape($items);
                   4231:                             $qresult.=$key.'='.$newvalue.'&';
                   4232:                         } else {
                   4233:                             $qresult.=$key.'='.$value.'&';
                   4234:                         }
1.384     raeburn  4235:                     } else {
1.388     raeburn  4236:                         my %rtnhash = ( 'description' => &unescape($val{'descr'}),
                   4237:                                         'inst_code' => &unescape($val{'inst_code'}),
                   4238:                                         'owner'     => &unescape($val{'owner'}),
                   4239:                                         'type'      => &unescape($val{'type'}),
1.419     raeburn  4240:                                         'cloners'   => &unescape($val{'cloners'}),
1.384     raeburn  4241:                                       );
                   4242:                         my $items = &Apache::lonnet::freeze_escape(\%rtnhash);
                   4243:                         $qresult.=$key.'='.$items.'&';
                   4244:                     }
1.383     raeburn  4245:                 } else {
1.384     raeburn  4246:                     if ($is_hash) {
                   4247:                         $qresult .= $key.'='.&escape($unesc_val{'descr'}).':'.
                   4248:                                     &escape($unesc_val{'inst_code'}).':'.
                   4249:                                     &escape($unesc_val{'owner'}).'&';
                   4250:                     } else {
                   4251:                         $qresult .= $key.'='.$val{'descr'}.':'.$val{'inst_code'}.
                   4252:                                     ':'.$val{'owner'}.'&';
                   4253:                     }
1.383     raeburn  4254:                 }
1.266     raeburn  4255:             }
1.234     foxr     4256: 	}
1.311     albertel 4257: 	if (&untie_domain_hash($hashref)) {
1.234     foxr     4258: 	    chop($qresult);
1.387     albertel 4259: 	    &Reply($client, \$qresult, $userinput);
1.234     foxr     4260: 	} else {
                   4261: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4262: 		    "while attempting courseiddump\n", $userinput);
                   4263: 	}
                   4264:     } else {
                   4265: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   4266: 		"while attempting courseiddump\n", $userinput);
                   4267:     }
                   4268:     return 1;
                   4269: }
                   4270: &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
1.238     foxr     4271: 
1.438     raeburn  4272: sub course_lastaccess_handler {
                   4273:     my ($cmd, $tail, $client) = @_;
                   4274:     my $userinput = "$cmd:$tail";
                   4275:     my ($cdom,$cnum) = split(':',$tail); 
                   4276:     my (%lastaccess,$qresult);
                   4277:     my $hashref = &tie_domain_hash($cdom, "nohist_courseids", &GDBM_WRCREAT());
                   4278:     if ($hashref) {
                   4279:         while (my ($key,$value) = each(%$hashref)) {
                   4280:             my ($unesc_key,$lasttime);
                   4281:             $unesc_key = &unescape($key);
                   4282:             if ($cnum) {
                   4283:                 next unless ($unesc_key =~ /\Q$cdom\E_\Q$cnum\E$/);
                   4284:             }
                   4285:             if ($unesc_key =~ /^lasttime:($LONCAPA::match_domain\_$LONCAPA::match_courseid)/) {
                   4286:                 $lastaccess{$1} = $value;
                   4287:             } else {
                   4288:                 my $items = &Apache::lonnet::thaw_unescape($value);
                   4289:                 if (ref($items) eq 'HASH') {
                   4290:                     unless ($lastaccess{$unesc_key}) {
                   4291:                         $lastaccess{$unesc_key} = '';
                   4292:                     }
                   4293:                 } else {
                   4294:                     my @courseitems = split(':',$value);
                   4295:                     $lastaccess{$unesc_key} = pop(@courseitems);
                   4296:                 }
                   4297:             }
                   4298:         }
                   4299:         foreach my $cid (sort(keys(%lastaccess))) {
                   4300:             $qresult.=&escape($cid).'='.$lastaccess{$cid}.'&'; 
                   4301:         }
                   4302:         if (&untie_domain_hash($hashref)) {
                   4303:             if ($qresult) {
                   4304:                 chop($qresult);
                   4305:             }
                   4306:             &Reply($client, \$qresult, $userinput);
                   4307:         } else {
                   4308:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4309:                     "while attempting lastacourseaccess\n", $userinput);
                   4310:         }
                   4311:     } else {
                   4312:         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   4313:                 "while attempting lastcourseaccess\n", $userinput);
                   4314:     }
                   4315:     return 1;
                   4316: }
                   4317: &register_handler("courselastaccess",\&course_lastaccess_handler, 0, 1, 0);
                   4318: 
1.238     foxr     4319: #
1.348     raeburn  4320: # Puts an unencrypted entry in a namespace db file at the domain level 
                   4321: #
                   4322: # Parameters:
                   4323: #    $cmd      - The command that got us here.
                   4324: #    $tail     - Tail of the command (remaining parameters).
                   4325: #    $client   - File descriptor connected to client.
                   4326: # Returns
                   4327: #     0        - Requested to exit, caller should shut down.
                   4328: #     1        - Continue processing.
                   4329: #  Side effects:
                   4330: #     reply is written to $client.
                   4331: #
                   4332: sub put_domain_handler {
                   4333:     my ($cmd,$tail,$client) = @_;
                   4334: 
                   4335:     my $userinput = "$cmd:$tail";
                   4336: 
                   4337:     my ($udom,$namespace,$what) =split(/:/,$tail,3);
                   4338:     chomp($what);
                   4339:     my @pairs=split(/\&/,$what);
                   4340:     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_WRCREAT(),
                   4341:                                    "P", $what);
                   4342:     if ($hashref) {
                   4343:         foreach my $pair (@pairs) {
                   4344:             my ($key,$value)=split(/=/,$pair);
                   4345:             $hashref->{$key}=$value;
                   4346:         }
                   4347:         if (&untie_domain_hash($hashref)) {
                   4348:             &Reply($client, "ok\n", $userinput);
                   4349:         } else {
                   4350:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4351:                      "while attempting putdom\n", $userinput);
                   4352:         }
                   4353:     } else {
                   4354:         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   4355:                   "while attempting putdom\n", $userinput);
                   4356:     }
                   4357: 
                   4358:     return 1;
                   4359: }
                   4360: &register_handler("putdom", \&put_domain_handler, 0, 1, 0);
                   4361: 
                   4362: # Unencrypted get from the namespace database file at the domain level.
                   4363: # This function retrieves a keyed item from a specific named database in the
                   4364: # domain directory.
                   4365: #
                   4366: # Parameters:
                   4367: #   $cmd             - Command request keyword (get).
                   4368: #   $tail            - Tail of the command.  This is a colon separated list
                   4369: #                      consisting of the domain and the 'namespace' 
                   4370: #                      which selects the gdbm file to do the lookup in,
                   4371: #                      & separated list of keys to lookup.  Note that
                   4372: #                      the values are returned as an & separated list too.
                   4373: #   $client          - File descriptor open on the client.
                   4374: # Returns:
                   4375: #   1       - Continue processing.
                   4376: #   0       - Exit.
                   4377: #  Side effects:
                   4378: #     reply is written to $client.
                   4379: #
                   4380: 
                   4381: sub get_domain_handler {
                   4382:     my ($cmd, $tail, $client) = @_;
                   4383: 
1.461     foxr     4384: 
1.348     raeburn  4385:     my $userinput = "$client:$tail";
                   4386: 
                   4387:     my ($udom,$namespace,$what)=split(/:/,$tail,3);
                   4388:     chomp($what);
                   4389:     my @queries=split(/\&/,$what);
                   4390:     my $qresult='';
                   4391:     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER());
                   4392:     if ($hashref) {
                   4393:         for (my $i=0;$i<=$#queries;$i++) {
                   4394:             $qresult.="$hashref->{$queries[$i]}&";
                   4395:         }
                   4396:         if (&untie_domain_hash($hashref)) {
                   4397:             $qresult=~s/\&$//;
1.387     albertel 4398:             &Reply($client, \$qresult, $userinput);
1.348     raeburn  4399:         } else {
                   4400:             &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4401:                       "while attempting getdom\n",$userinput);
                   4402:         }
                   4403:     } else {
                   4404:         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   4405:                  "while attempting getdom\n",$userinput);
                   4406:     }
                   4407: 
                   4408:     return 1;
                   4409: }
1.360     raeburn  4410: &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
1.348     raeburn  4411: 
1.420     raeburn  4412: #
1.238     foxr     4413: #  Puts an id to a domains id database. 
                   4414: #
                   4415: #  Parameters:
                   4416: #   $cmd     - The command that triggered us.
                   4417: #   $tail    - Remainder of the request other than the command. This is a 
                   4418: #              colon separated list containing:
                   4419: #              $domain  - The domain for which we are writing the id.
                   4420: #              $pairs  - The id info to write... this is and & separated list
                   4421: #                        of keyword=value.
                   4422: #   $client  - Socket open on the client.
                   4423: #  Returns:
                   4424: #    1   - Continue processing.
                   4425: #  Side effects:
                   4426: #     reply is written to $client.
                   4427: #
                   4428: sub put_id_handler {
                   4429:     my ($cmd,$tail,$client) = @_;
                   4430: 
                   4431: 
                   4432:     my $userinput = "$cmd:$tail";
                   4433: 
                   4434:     my ($udom,$what)=split(/:/,$tail);
                   4435:     chomp($what);
                   4436:     my @pairs=split(/\&/,$what);
                   4437:     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
                   4438: 				   "P", $what);
                   4439:     if ($hashref) {
                   4440: 	foreach my $pair (@pairs) {
                   4441: 	    my ($key,$value)=split(/=/,$pair);
                   4442: 	    $hashref->{$key}=$value;
                   4443: 	}
1.311     albertel 4444: 	if (&untie_domain_hash($hashref)) {
1.238     foxr     4445: 	    &Reply($client, "ok\n", $userinput);
                   4446: 	} else {
                   4447: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4448: 		     "while attempting idput\n", $userinput);
                   4449: 	}
                   4450:     } else {
                   4451: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   4452: 		  "while attempting idput\n", $userinput);
                   4453:     }
                   4454: 
                   4455:     return 1;
                   4456: }
1.263     albertel 4457: &register_handler("idput", \&put_id_handler, 0, 1, 0);
1.238     foxr     4458: 
                   4459: #
                   4460: #  Retrieves a set of id values from the id database.
                   4461: #  Returns an & separated list of results, one for each requested id to the
                   4462: #  client.
                   4463: #
                   4464: # Parameters:
                   4465: #   $cmd       - Command keyword that caused us to be dispatched.
                   4466: #   $tail      - Tail of the command.  Consists of a colon separated:
                   4467: #               domain - the domain whose id table we dump
                   4468: #               ids      Consists of an & separated list of
                   4469: #                        id keywords whose values will be fetched.
                   4470: #                        nonexisting keywords will have an empty value.
                   4471: #   $client    - Socket open on the client.
                   4472: #
                   4473: # Returns:
                   4474: #    1 - indicating processing should continue.
                   4475: # Side effects:
                   4476: #   An & separated list of results is written to $client.
                   4477: #
                   4478: sub get_id_handler {
                   4479:     my ($cmd, $tail, $client) = @_;
                   4480: 
                   4481:     
                   4482:     my $userinput = "$client:$tail";
                   4483:     
                   4484:     my ($udom,$what)=split(/:/,$tail);
                   4485:     chomp($what);
                   4486:     my @queries=split(/\&/,$what);
                   4487:     my $qresult='';
                   4488:     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
                   4489:     if ($hashref) {
                   4490: 	for (my $i=0;$i<=$#queries;$i++) {
                   4491: 	    $qresult.="$hashref->{$queries[$i]}&";
                   4492: 	}
1.311     albertel 4493: 	if (&untie_domain_hash($hashref)) {
1.238     foxr     4494: 	    $qresult=~s/\&$//;
1.387     albertel 4495: 	    &Reply($client, \$qresult, $userinput);
1.238     foxr     4496: 	} else {
                   4497: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4498: 		      "while attempting idget\n",$userinput);
                   4499: 	}
                   4500:     } else {
                   4501: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   4502: 		 "while attempting idget\n",$userinput);
                   4503:     }
                   4504:     
                   4505:     return 1;
                   4506: }
1.263     albertel 4507: &register_handler("idget", \&get_id_handler, 0, 1, 0);
1.238     foxr     4508: 
                   4509: #
1.299     raeburn  4510: # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database 
                   4511: #
                   4512: # Parameters
                   4513: #   $cmd       - Command keyword that caused us to be dispatched.
                   4514: #   $tail      - Tail of the command.  Consists of a colon separated:
                   4515: #               domain - the domain whose dcmail we are recording
                   4516: #               email    Consists of key=value pair 
                   4517: #                        where key is unique msgid
                   4518: #                        and value is message (in XML)
                   4519: #   $client    - Socket open on the client.
                   4520: #
                   4521: # Returns:
                   4522: #    1 - indicating processing should continue.
                   4523: # Side effects
                   4524: #     reply is written to $client.
                   4525: #
                   4526: sub put_dcmail_handler {
                   4527:     my ($cmd,$tail,$client) = @_;
                   4528:     my $userinput = "$cmd:$tail";
1.463     foxr     4529: 
                   4530: 
1.299     raeburn  4531:     my ($udom,$what)=split(/:/,$tail);
                   4532:     chomp($what);
                   4533:     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
                   4534:     if ($hashref) {
                   4535:         my ($key,$value)=split(/=/,$what);
                   4536:         $hashref->{$key}=$value;
                   4537:     }
1.311     albertel 4538:     if (&untie_domain_hash($hashref)) {
1.299     raeburn  4539:         &Reply($client, "ok\n", $userinput);
                   4540:     } else {
                   4541:         &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4542:                  "while attempting dcmailput\n", $userinput);
                   4543:     }
                   4544:     return 1;
                   4545: }
                   4546: &register_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
                   4547: 
                   4548: #
                   4549: # Retrieves broadcast e-mail from nohist_dcmail database
                   4550: # Returns to client an & separated list of key=value pairs,
                   4551: # where key is msgid and value is message information.
                   4552: #
                   4553: # Parameters
                   4554: #   $cmd       - Command keyword that caused us to be dispatched.
                   4555: #   $tail      - Tail of the command.  Consists of a colon separated:
                   4556: #               domain - the domain whose dcmail table we dump
                   4557: #               startfilter - beginning of time window 
                   4558: #               endfilter - end of time window
                   4559: #               sendersfilter - & separated list of username:domain 
                   4560: #                 for senders to search for.
                   4561: #   $client    - Socket open on the client.
                   4562: #
                   4563: # Returns:
                   4564: #    1 - indicating processing should continue.
                   4565: # Side effects
                   4566: #     reply (& separated list of msgid=messageinfo pairs) is 
                   4567: #     written to $client.
                   4568: #
                   4569: sub dump_dcmail_handler {
                   4570:     my ($cmd, $tail, $client) = @_;
                   4571:                                                                                 
                   4572:     my $userinput = "$cmd:$tail";
                   4573:     my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
                   4574:     chomp($sendersfilter);
                   4575:     my @senders = ();
                   4576:     if (defined($startfilter)) {
                   4577:         $startfilter=&unescape($startfilter);
                   4578:     } else {
                   4579:         $startfilter='.';
                   4580:     }
                   4581:     if (defined($endfilter)) {
                   4582:         $endfilter=&unescape($endfilter);
                   4583:     } else {
                   4584:         $endfilter='.';
                   4585:     }
                   4586:     if (defined($sendersfilter)) {
                   4587:         $sendersfilter=&unescape($sendersfilter);
1.300     albertel 4588: 	@senders = map { &unescape($_) } split(/\&/,$sendersfilter);
1.299     raeburn  4589:     }
                   4590: 
                   4591:     my $qresult='';
                   4592:     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
                   4593:     if ($hashref) {
                   4594:         while (my ($key,$value) = each(%$hashref)) {
                   4595:             my $match = 1;
1.303     albertel 4596:             my ($timestamp,$subj,$uname,$udom) = 
                   4597: 		split(/:/,&unescape(&unescape($key)),5); # yes, twice really
1.299     raeburn  4598:             $subj = &unescape($subj);
                   4599:             unless ($startfilter eq '.' || !defined($startfilter)) {
                   4600:                 if ($timestamp < $startfilter) {
                   4601:                     $match = 0;
                   4602:                 }
                   4603:             }
                   4604:             unless ($endfilter eq '.' || !defined($endfilter)) {
                   4605:                 if ($timestamp > $endfilter) {
                   4606:                     $match = 0;
                   4607:                 }
                   4608:             }
                   4609:             unless (@senders < 1) {
                   4610:                 unless (grep/^$uname:$udom$/,@senders) {
                   4611:                     $match = 0;
                   4612:                 }
                   4613:             }
                   4614:             if ($match == 1) {
                   4615:                 $qresult.=$key.'='.$value.'&';
                   4616:             }
                   4617:         }
1.311     albertel 4618:         if (&untie_domain_hash($hashref)) {
1.299     raeburn  4619:             chop($qresult);
1.387     albertel 4620:             &Reply($client, \$qresult, $userinput);
1.299     raeburn  4621:         } else {
                   4622:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4623:                     "while attempting dcmaildump\n", $userinput);
                   4624:         }
                   4625:     } else {
                   4626:         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   4627:                 "while attempting dcmaildump\n", $userinput);
                   4628:     }
                   4629:     return 1;
                   4630: }
                   4631: 
                   4632: &register_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
                   4633: 
                   4634: #
                   4635: # Puts domain roles in nohist_domainroles database
                   4636: #
                   4637: # Parameters
                   4638: #   $cmd       - Command keyword that caused us to be dispatched.
                   4639: #   $tail      - Tail of the command.  Consists of a colon separated:
                   4640: #               domain - the domain whose roles we are recording  
                   4641: #               role -   Consists of key=value pair
                   4642: #                        where key is unique role
                   4643: #                        and value is start/end date information
                   4644: #   $client    - Socket open on the client.
                   4645: #
                   4646: # Returns:
                   4647: #    1 - indicating processing should continue.
                   4648: # Side effects
                   4649: #     reply is written to $client.
                   4650: #
                   4651: 
                   4652: sub put_domainroles_handler {
                   4653:     my ($cmd,$tail,$client) = @_;
                   4654: 
                   4655:     my $userinput = "$cmd:$tail";
                   4656:     my ($udom,$what)=split(/:/,$tail);
                   4657:     chomp($what);
                   4658:     my @pairs=split(/\&/,$what);
                   4659:     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
                   4660:     if ($hashref) {
                   4661:         foreach my $pair (@pairs) {
                   4662:             my ($key,$value)=split(/=/,$pair);
                   4663:             $hashref->{$key}=$value;
                   4664:         }
1.311     albertel 4665:         if (&untie_domain_hash($hashref)) {
1.299     raeburn  4666:             &Reply($client, "ok\n", $userinput);
                   4667:         } else {
                   4668:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4669:                      "while attempting domroleput\n", $userinput);
                   4670:         }
                   4671:     } else {
                   4672:         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   4673:                   "while attempting domroleput\n", $userinput);
                   4674:     }
                   4675:                                                                                   
                   4676:     return 1;
                   4677: }
                   4678: 
                   4679: &register_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
                   4680: 
                   4681: #
                   4682: # Retrieves domain roles from nohist_domainroles database
                   4683: # Returns to client an & separated list of key=value pairs,
                   4684: # where key is role and value is start and end date information.
                   4685: #
                   4686: # Parameters
                   4687: #   $cmd       - Command keyword that caused us to be dispatched.
                   4688: #   $tail      - Tail of the command.  Consists of a colon separated:
                   4689: #               domain - the domain whose domain roles table we dump
                   4690: #   $client    - Socket open on the client.
                   4691: #
                   4692: # Returns:
                   4693: #    1 - indicating processing should continue.
                   4694: # Side effects
                   4695: #     reply (& separated list of role=start/end info pairs) is
                   4696: #     written to $client.
                   4697: #
                   4698: sub dump_domainroles_handler {
                   4699:     my ($cmd, $tail, $client) = @_;
                   4700:                                                                                            
                   4701:     my $userinput = "$cmd:$tail";
                   4702:     my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
                   4703:     chomp($rolesfilter);
                   4704:     my @roles = ();
                   4705:     if (defined($startfilter)) {
                   4706:         $startfilter=&unescape($startfilter);
                   4707:     } else {
                   4708:         $startfilter='.';
                   4709:     }
                   4710:     if (defined($endfilter)) {
                   4711:         $endfilter=&unescape($endfilter);
                   4712:     } else {
                   4713:         $endfilter='.';
                   4714:     }
                   4715:     if (defined($rolesfilter)) {
                   4716:         $rolesfilter=&unescape($rolesfilter);
1.300     albertel 4717: 	@roles = split(/\&/,$rolesfilter);
1.299     raeburn  4718:     }
1.421     raeburn  4719: 
1.299     raeburn  4720:     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
                   4721:     if ($hashref) {
                   4722:         my $qresult = '';
                   4723:         while (my ($key,$value) = each(%$hashref)) {
                   4724:             my $match = 1;
1.421     raeburn  4725:             my ($end,$start) = split(/:/,&unescape($value));
1.299     raeburn  4726:             my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
1.421     raeburn  4727:             unless (@roles < 1) {
                   4728:                 unless (grep/^\Q$trole\E$/,@roles) {
                   4729:                     $match = 0;
                   4730:                     next;
                   4731:                 }
                   4732:             }
1.299     raeburn  4733:             unless ($startfilter eq '.' || !defined($startfilter)) {
1.415     raeburn  4734:                 if ((defined($start)) && ($start >= $startfilter)) {
1.299     raeburn  4735:                     $match = 0;
1.421     raeburn  4736:                     next;
1.299     raeburn  4737:                 }
                   4738:             }
                   4739:             unless ($endfilter eq '.' || !defined($endfilter)) {
1.421     raeburn  4740:                 if ((defined($end)) && (($end > 0) && ($end <= $endfilter))) {
1.299     raeburn  4741:                     $match = 0;
1.421     raeburn  4742:                     next;
1.299     raeburn  4743:                 }
                   4744:             }
                   4745:             if ($match == 1) {
                   4746:                 $qresult.=$key.'='.$value.'&';
                   4747:             }
                   4748:         }
1.311     albertel 4749:         if (&untie_domain_hash($hashref)) {
1.299     raeburn  4750:             chop($qresult);
1.387     albertel 4751:             &Reply($client, \$qresult, $userinput);
1.299     raeburn  4752:         } else {
                   4753:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   4754:                     "while attempting domrolesdump\n", $userinput);
                   4755:         }
                   4756:     } else {
                   4757:         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   4758:                 "while attempting domrolesdump\n", $userinput);
                   4759:     }
                   4760:     return 1;
                   4761: }
                   4762: 
                   4763: &register_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
                   4764: 
                   4765: 
1.238     foxr     4766: #  Process the tmpput command I'm not sure what this does.. Seems to
                   4767: #  create a file in the lonDaemons/tmp directory of the form $id.tmp
                   4768: # where Id is the client's ip concatenated with a sequence number.
                   4769: # The file will contain some value that is passed in.  Is this e.g.
                   4770: # a login token?
                   4771: #
                   4772: # Parameters:
                   4773: #    $cmd     - The command that got us dispatched.
                   4774: #    $tail    - The remainder of the request following $cmd:
                   4775: #               In this case this will be the contents of the file.
                   4776: #    $client  - Socket connected to the client.
                   4777: # Returns:
                   4778: #    1 indicating processing can continue.
                   4779: # Side effects:
                   4780: #   A file is created in the local filesystem.
                   4781: #   A reply is sent to the client.
                   4782: sub tmp_put_handler {
                   4783:     my ($cmd, $what, $client) = @_;
                   4784: 
                   4785:     my $userinput = "$cmd:$what";	# Reconstruct for logging.
                   4786: 
1.347     raeburn  4787:     my ($record,$context) = split(/:/,$what);
                   4788:     if ($context ne '') {
                   4789:         chomp($context);
                   4790:         $context = &unescape($context);
                   4791:     }
                   4792:     my ($id,$store);
1.238     foxr     4793:     $tmpsnum++;
1.454     raeburn  4794:     if (($context eq 'resetpw') || ($context eq 'createaccount')) {
1.347     raeburn  4795:         $id = &md5_hex(&md5_hex(time.{}.rand().$$));
                   4796:     } else {
                   4797:         $id = $$.'_'.$clientip.'_'.$tmpsnum;
                   4798:     }
1.238     foxr     4799:     $id=~s/\W/\_/g;
1.347     raeburn  4800:     $record=~s/\n//g;
1.238     foxr     4801:     my $execdir=$perlvar{'lonDaemons'};
                   4802:     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1.347     raeburn  4803: 	print $store $record;
1.238     foxr     4804: 	close $store;
1.387     albertel 4805: 	&Reply($client, \$id, $userinput);
1.238     foxr     4806:     } else {
                   4807: 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                   4808: 		  "while attempting tmpput\n", $userinput);
                   4809:     }
                   4810:     return 1;
                   4811:   
                   4812: }
                   4813: &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
1.263     albertel 4814: 
1.238     foxr     4815: #   Processes the tmpget command.  This command returns the contents
                   4816: #  of a temporary resource file(?) created via tmpput.
                   4817: #
                   4818: # Paramters:
                   4819: #    $cmd      - Command that got us dispatched.
                   4820: #    $id       - Tail of the command, contain the id of the resource
                   4821: #                we want to fetch.
                   4822: #    $client   - socket open on the client.
                   4823: # Return:
                   4824: #    1         - Inidcating processing can continue.
                   4825: # Side effects:
                   4826: #   A reply is sent to the client.
                   4827: #
                   4828: sub tmp_get_handler {
                   4829:     my ($cmd, $id, $client) = @_;
                   4830: 
                   4831:     my $userinput = "$cmd:$id"; 
                   4832:     
                   4833: 
                   4834:     $id=~s/\W/\_/g;
                   4835:     my $store;
                   4836:     my $execdir=$perlvar{'lonDaemons'};
                   4837:     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
                   4838: 	my $reply=<$store>;
1.387     albertel 4839: 	&Reply( $client, \$reply, $userinput);
1.238     foxr     4840: 	close $store;
                   4841:     } else {
                   4842: 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                   4843: 		  "while attempting tmpget\n", $userinput);
                   4844:     }
                   4845: 
                   4846:     return 1;
                   4847: }
                   4848: &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
1.263     albertel 4849: 
1.238     foxr     4850: #
                   4851: #  Process the tmpdel command.  This command deletes a temp resource
                   4852: #  created by the tmpput command.
                   4853: #
                   4854: # Parameters:
                   4855: #   $cmd      - Command that got us here.
                   4856: #   $id       - Id of the temporary resource created.
                   4857: #   $client   - socket open on the client process.
                   4858: #
                   4859: # Returns:
                   4860: #   1     - Indicating processing should continue.
                   4861: # Side Effects:
                   4862: #   A file is deleted
                   4863: #   A reply is sent to the client.
                   4864: sub tmp_del_handler {
                   4865:     my ($cmd, $id, $client) = @_;
                   4866:     
                   4867:     my $userinput= "$cmd:$id";
                   4868:     
                   4869:     chomp($id);
                   4870:     $id=~s/\W/\_/g;
                   4871:     my $execdir=$perlvar{'lonDaemons'};
                   4872:     if (unlink("$execdir/tmp/$id.tmp")) {
                   4873: 	&Reply($client, "ok\n", $userinput);
                   4874:     } else {
                   4875: 	&Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
                   4876: 		  "while attempting tmpdel\n", $userinput);
                   4877:     }
                   4878:     
                   4879:     return 1;
                   4880: 
                   4881: }
                   4882: &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
1.263     albertel 4883: 
1.238     foxr     4884: #
1.246     foxr     4885: #   Processes the setannounce command.  This command
                   4886: #   creates a file named announce.txt in the top directory of
                   4887: #   the documentn root and sets its contents.  The announce.txt file is
                   4888: #   printed in its entirety at the LonCAPA login page.  Note:
                   4889: #   once the announcement.txt fileis created it cannot be deleted.
                   4890: #   However, setting the contents of the file to empty removes the
                   4891: #   announcement from the login page of loncapa so who cares.
                   4892: #
                   4893: # Parameters:
                   4894: #    $cmd          - The command that got us dispatched.
                   4895: #    $announcement - The text of the announcement.
                   4896: #    $client       - Socket open on the client process.
                   4897: # Retunrns:
                   4898: #   1             - Indicating request processing should continue
                   4899: # Side Effects:
                   4900: #   The file {DocRoot}/announcement.txt is created.
                   4901: #   A reply is sent to $client.
                   4902: #
                   4903: sub set_announce_handler {
                   4904:     my ($cmd, $announcement, $client) = @_;
                   4905:   
                   4906:     my $userinput    = "$cmd:$announcement";
                   4907: 
                   4908:     chomp($announcement);
                   4909:     $announcement=&unescape($announcement);
                   4910:     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
                   4911: 				'/announcement.txt')) {
                   4912: 	print $store $announcement;
                   4913: 	close $store;
                   4914: 	&Reply($client, "ok\n", $userinput);
                   4915:     } else {
                   4916: 	&Failure($client, "error: ".($!+0)."\n", $userinput);
                   4917:     }
                   4918: 
                   4919:     return 1;
                   4920: }
                   4921: &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
1.263     albertel 4922: 
1.246     foxr     4923: #
                   4924: #  Return the version of the daemon.  This can be used to determine
                   4925: #  the compatibility of cross version installations or, alternatively to
                   4926: #  simply know who's out of date and who isn't.  Note that the version
                   4927: #  is returned concatenated with the tail.
                   4928: # Parameters:
                   4929: #   $cmd        - the request that dispatched to us.
                   4930: #   $tail       - Tail of the request (client's version?).
                   4931: #   $client     - Socket open on the client.
                   4932: #Returns:
                   4933: #   1 - continue processing requests.
                   4934: # Side Effects:
                   4935: #   Replies with version to $client.
                   4936: sub get_version_handler {
                   4937:     my ($cmd, $tail, $client) = @_;
                   4938: 
                   4939:     my $userinput  = $cmd.$tail;
                   4940:     
                   4941:     &Reply($client, &version($userinput)."\n", $userinput);
                   4942: 
                   4943: 
                   4944:     return 1;
                   4945: }
                   4946: &register_handler("version", \&get_version_handler, 0, 1, 0);
1.263     albertel 4947: 
1.246     foxr     4948: #  Set the current host and domain.  This is used to support
                   4949: #  multihomed systems.  Each IP of the system, or even separate daemons
                   4950: #  on the same IP can be treated as handling a separate lonCAPA virtual
                   4951: #  machine.  This command selects the virtual lonCAPA.  The client always
                   4952: #  knows the right one since it is lonc and it is selecting the domain/system
                   4953: #  from the hosts.tab file.
                   4954: # Parameters:
                   4955: #    $cmd      - Command that dispatched us.
                   4956: #    $tail     - Tail of the command (domain/host requested).
                   4957: #    $socket   - Socket open on the client.
                   4958: #
                   4959: # Returns:
                   4960: #     1   - Indicates the program should continue to process requests.
                   4961: # Side-effects:
                   4962: #     The default domain/system context is modified for this daemon.
                   4963: #     a reply is sent to the client.
                   4964: #
                   4965: sub set_virtual_host_handler {
                   4966:     my ($cmd, $tail, $socket) = @_;
                   4967:   
                   4968:     my $userinput  ="$cmd:$tail";
                   4969: 
                   4970:     &Reply($client, &sethost($userinput)."\n", $userinput);
                   4971: 
                   4972: 
                   4973:     return 1;
                   4974: }
1.247     albertel 4975: &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
1.246     foxr     4976: 
                   4977: #  Process a request to exit:
                   4978: #   - "bye" is sent to the client.
                   4979: #   - The client socket is shutdown and closed.
                   4980: #   - We indicate to the caller that we should exit.
                   4981: # Formal Parameters:
                   4982: #   $cmd                - The command that got us here.
                   4983: #   $tail               - Tail of the command (empty).
                   4984: #   $client             - Socket open on the tail.
                   4985: # Returns:
                   4986: #   0      - Indicating the program should exit!!
                   4987: #
                   4988: sub exit_handler {
                   4989:     my ($cmd, $tail, $client) = @_;
                   4990: 
                   4991:     my $userinput = "$cmd:$tail";
                   4992: 
                   4993:     &logthis("Client $clientip ($clientname) hanging up: $userinput");
                   4994:     &Reply($client, "bye\n", $userinput);
                   4995:     $client->shutdown(2);        # shutdown the socket forcibly.
                   4996:     $client->close();
                   4997: 
                   4998:     return 0;
                   4999: }
1.248     foxr     5000: &register_handler("exit", \&exit_handler, 0,1,1);
                   5001: &register_handler("init", \&exit_handler, 0,1,1);
                   5002: &register_handler("quit", \&exit_handler, 0,1,1);
                   5003: 
                   5004: #  Determine if auto-enrollment is enabled.
                   5005: #  Note that the original had what I believe to be a defect.
                   5006: #  The original returned 0 if the requestor was not a registerd client.
                   5007: #  It should return "refused".
                   5008: # Formal Parameters:
                   5009: #   $cmd       - The command that invoked us.
                   5010: #   $tail      - The tail of the command (Extra command parameters.
                   5011: #   $client    - The socket open on the client that issued the request.
                   5012: # Returns:
                   5013: #    1         - Indicating processing should continue.
                   5014: #
                   5015: sub enrollment_enabled_handler {
                   5016:     my ($cmd, $tail, $client) = @_;
                   5017:     my $userinput = $cmd.":".$tail; # For logging purposes.
                   5018: 
                   5019:     
1.337     albertel 5020:     my ($cdom) = split(/:/, $tail, 2);   # Domain we're asking about.
                   5021: 
1.248     foxr     5022:     my $outcome  = &localenroll::run($cdom);
1.387     albertel 5023:     &Reply($client, \$outcome, $userinput);
1.248     foxr     5024: 
                   5025:     return 1;
                   5026: }
                   5027: &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
                   5028: 
1.417     raeburn  5029: #
1.423     raeburn  5030: #   Validate an institutional code used for a LON-CAPA course.          
1.417     raeburn  5031: #
                   5032: # Formal Parameters:
                   5033: #   $cmd          - The command request that got us dispatched.
                   5034: #   $tail         - The tail of the command.  In this case,
                   5035: #                   this is a colon separated set of words that will be split
                   5036: #                   into:
1.424     raeburn  5037: #                        $dom      - The domain for which the check of 
                   5038: #                                    institutional course code will occur.
                   5039: #
                   5040: #                        $instcode - The institutional code for the course
                   5041: #                                    being requested, or validated for rights
                   5042: #                                    to request.
                   5043: #
                   5044: #                        $owner    - The course requestor (who will be the
                   5045: #                                    course owner, in the form username:domain
                   5046: #
1.417     raeburn  5047: #   $client       - Socket open on the client.
                   5048: # Returns:
                   5049: #    1           - Indicating processing should continue.
                   5050: #
                   5051: sub validate_instcode_handler {
                   5052:     my ($cmd, $tail, $client) = @_;
                   5053:     my $userinput = "$cmd:$tail";
1.423     raeburn  5054:     my ($dom,$instcode,$owner) = split(/:/, $tail);
1.422     raeburn  5055:     $instcode = &unescape($instcode);
                   5056:     $owner = &unescape($owner);
1.426     raeburn  5057:     my ($outcome,$description) = 
                   5058:         &localenroll::validate_instcode($dom,$instcode,$owner);
                   5059:     my $result = &escape($outcome).'&'.&escape($description);
                   5060:     &Reply($client, \$result, $userinput);
1.417     raeburn  5061: 
                   5062:     return 1;
                   5063: }
                   5064: &register_handler("autovalidateinstcode", \&validate_instcode_handler, 0, 1, 0);
                   5065: 
1.248     foxr     5066: #   Get the official sections for which auto-enrollment is possible.
                   5067: #   Since the admin people won't know about 'unofficial sections' 
                   5068: #   we cannot auto-enroll on them.
                   5069: # Formal Parameters:
                   5070: #    $cmd     - The command request that got us dispatched here.
                   5071: #    $tail    - The remainder of the request.  In our case this
                   5072: #               will be split into:
                   5073: #               $coursecode   - The course name from the admin point of view.
                   5074: #               $cdom         - The course's domain(?).
                   5075: #    $client  - Socket open on the client.
                   5076: # Returns:
                   5077: #    1    - Indiciting processing should continue.
                   5078: #
                   5079: sub get_sections_handler {
                   5080:     my ($cmd, $tail, $client) = @_;
                   5081:     my $userinput = "$cmd:$tail";
                   5082: 
                   5083:     my ($coursecode, $cdom) = split(/:/, $tail);
                   5084:     my @secs = &localenroll::get_sections($coursecode,$cdom);
                   5085:     my $seclist = &escape(join(':',@secs));
                   5086: 
1.387     albertel 5087:     &Reply($client, \$seclist, $userinput);
1.248     foxr     5088:     
                   5089: 
                   5090:     return 1;
                   5091: }
                   5092: &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
                   5093: 
                   5094: #   Validate the owner of a new course section.  
                   5095: #
                   5096: # Formal Parameters:
                   5097: #   $cmd      - Command that got us dispatched.
                   5098: #   $tail     - the remainder of the command.  For us this consists of a
                   5099: #               colon separated string containing:
                   5100: #                  $inst    - Course Id from the institutions point of view.
                   5101: #                  $owner   - Proposed owner of the course.
                   5102: #                  $cdom    - Domain of the course (from the institutions
                   5103: #                             point of view?)..
                   5104: #   $client   - Socket open on the client.
                   5105: #
                   5106: # Returns:
                   5107: #   1        - Processing should continue.
                   5108: #
                   5109: sub validate_course_owner_handler {
                   5110:     my ($cmd, $tail, $client)  = @_;
                   5111:     my $userinput = "$cmd:$tail";
1.470     raeburn  5112:     my ($inst_course_id, $owner, $cdom, $coowners) = split(/:/, $tail);
                   5113:     
1.336     raeburn  5114:     $owner = &unescape($owner);
1.470     raeburn  5115:     $coowners = &unescape($coowners);
                   5116:     my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom,$coowners);
1.387     albertel 5117:     &Reply($client, \$outcome, $userinput);
1.248     foxr     5118: 
                   5119: 
                   5120: 
                   5121:     return 1;
                   5122: }
                   5123: &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
1.263     albertel 5124: 
1.248     foxr     5125: #
                   5126: #   Validate a course section in the official schedule of classes
                   5127: #   from the institutions point of view (part of autoenrollment).
                   5128: #
                   5129: # Formal Parameters:
                   5130: #   $cmd          - The command request that got us dispatched.
                   5131: #   $tail         - The tail of the command.  In this case,
                   5132: #                   this is a colon separated set of words that will be split
                   5133: #                   into:
                   5134: #                        $inst_course_id - The course/section id from the
                   5135: #                                          institutions point of view.
                   5136: #                        $cdom           - The domain from the institutions
                   5137: #                                          point of view.
                   5138: #   $client       - Socket open on the client.
                   5139: # Returns:
                   5140: #    1           - Indicating processing should continue.
                   5141: #
                   5142: sub validate_course_section_handler {
                   5143:     my ($cmd, $tail, $client) = @_;
                   5144:     my $userinput = "$cmd:$tail";
                   5145:     my ($inst_course_id, $cdom) = split(/:/, $tail);
                   5146: 
                   5147:     my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
1.387     albertel 5148:     &Reply($client, \$outcome, $userinput);
1.248     foxr     5149: 
                   5150: 
                   5151:     return 1;
                   5152: }
                   5153: &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
                   5154: 
                   5155: #
1.340     raeburn  5156: #   Validate course owner's access to enrollment data for specific class section. 
                   5157: #   
                   5158: #
                   5159: # Formal Parameters:
                   5160: #    $cmd     - The command request that got us dispatched.
                   5161: #    $tail    - The tail of the command.   In this case this is a colon separated
                   5162: #               set of words that will be split into:
                   5163: #               $inst_class  - Institutional code for the specific class section   
                   5164: #               $courseowner - The escaped username:domain of the course owner 
                   5165: #               $cdom        - The domain of the course from the institution's
                   5166: #                              point of view.
                   5167: #    $client  - The socket open on the client.
                   5168: # Returns:
                   5169: #    1 - continue processing.
                   5170: #
                   5171: 
                   5172: sub validate_class_access_handler {
                   5173:     my ($cmd, $tail, $client) = @_;
                   5174:     my $userinput = "$cmd:$tail";
1.383     raeburn  5175:     my ($inst_class,$ownerlist,$cdom) = split(/:/, $tail);
1.392     raeburn  5176:     my $owners = &unescape($ownerlist);
1.341     albertel 5177:     my $outcome;
                   5178:     eval {
                   5179: 	local($SIG{__DIE__})='DEFAULT';
1.392     raeburn  5180: 	$outcome=&localenroll::check_section($inst_class,$owners,$cdom);
1.341     albertel 5181:     };
1.387     albertel 5182:     &Reply($client,\$outcome, $userinput);
1.340     raeburn  5183: 
                   5184:     return 1;
                   5185: }
                   5186: &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
                   5187: 
                   5188: #
                   5189: #   Create a password for a new LON-CAPA user added by auto-enrollment.
                   5190: #   Only used for case where authentication method for new user is localauth
1.248     foxr     5191: #
                   5192: # Formal Parameters:
                   5193: #    $cmd     - The command request that got us dispatched.
                   5194: #    $tail    - The tail of the command.   In this case this is a colon separated
                   5195: #               set of words that will be split into:
1.340     raeburn  5196: #               $authparam - An authentication parameter (localauth parameter).
1.248     foxr     5197: #               $cdom      - The domain of the course from the institution's
                   5198: #                            point of view.
                   5199: #    $client  - The socket open on the client.
                   5200: # Returns:
                   5201: #    1 - continue processing.
                   5202: #
                   5203: sub create_auto_enroll_password_handler {
                   5204:     my ($cmd, $tail, $client) = @_;
                   5205:     my $userinput = "$cmd:$tail";
                   5206: 
                   5207:     my ($authparam, $cdom) = split(/:/, $userinput);
                   5208: 
                   5209:     my ($create_passwd,$authchk);
                   5210:     ($authparam,
                   5211:      $create_passwd,
                   5212:      $authchk) = &localenroll::create_password($authparam,$cdom);
                   5213: 
                   5214:     &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
                   5215: 	   $userinput);
                   5216: 
                   5217: 
                   5218:     return 1;
                   5219: }
                   5220: &register_handler("autocreatepassword", \&create_auto_enroll_password_handler, 
                   5221: 		  0, 1, 0);
                   5222: 
                   5223: #   Retrieve and remove temporary files created by/during autoenrollment.
                   5224: #
                   5225: # Formal Parameters:
                   5226: #    $cmd      - The command that got us dispatched.
                   5227: #    $tail     - The tail of the command.  In our case this is a colon 
                   5228: #                separated list that will be split into:
                   5229: #                $filename - The name of the file to remove.
                   5230: #                            The filename is given as a path relative to
                   5231: #                            the LonCAPA temp file directory.
                   5232: #    $client   - Socket open on the client.
                   5233: #
                   5234: # Returns:
                   5235: #   1     - Continue processing.
                   5236: sub retrieve_auto_file_handler {
                   5237:     my ($cmd, $tail, $client)    = @_;
                   5238:     my $userinput                = "cmd:$tail";
                   5239: 
                   5240:     my ($filename)   = split(/:/, $tail);
                   5241: 
                   5242:     my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
                   5243:     if ( (-e $source) && ($filename ne '') ) {
                   5244: 	my $reply = '';
                   5245: 	if (open(my $fh,$source)) {
                   5246: 	    while (<$fh>) {
                   5247: 		chomp($_);
                   5248: 		$_ =~ s/^\s+//g;
                   5249: 		$_ =~ s/\s+$//g;
                   5250: 		$reply .= $_;
                   5251: 	    }
                   5252: 	    close($fh);
                   5253: 	    &Reply($client, &escape($reply)."\n", $userinput);
                   5254: 
                   5255: #   Does this have to be uncommented??!?  (RF).
                   5256: #
                   5257: #                                unlink($source);
                   5258: 	} else {
                   5259: 	    &Failure($client, "error\n", $userinput);
                   5260: 	}
                   5261:     } else {
                   5262: 	&Failure($client, "error\n", $userinput);
                   5263:     }
                   5264:     
                   5265: 
                   5266:     return 1;
                   5267: }
                   5268: &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
                   5269: 
1.423     raeburn  5270: sub crsreq_checks_handler {
                   5271:     my ($cmd, $tail, $client) = @_;
                   5272:     my $userinput = "$cmd:$tail";
                   5273:     my $dom = $tail;
                   5274:     my $result;
1.424     raeburn  5275:     my @reqtypes = ('official','unofficial','community');
1.423     raeburn  5276:     eval {
                   5277:         local($SIG{__DIE__})='DEFAULT';
                   5278:         my %validations;
1.424     raeburn  5279:         my $response = &localenroll::crsreq_checks($dom,\@reqtypes,
                   5280:                                                    \%validations);
1.423     raeburn  5281:         if ($response eq 'ok') { 
                   5282:             foreach my $key (keys(%validations)) {
                   5283:                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($validations{$key}).'&';
                   5284:             }
                   5285:             $result =~ s/\&$//;
                   5286:         } else {
                   5287:             $result = 'error';
                   5288:         }
                   5289:     };
                   5290:     if (!$@) {
                   5291:         &Reply($client, \$result, $userinput);
                   5292:     } else {
                   5293:         &Failure($client,"unknown_cmd\n",$userinput);
                   5294:     }
                   5295:     return 1;
                   5296: }
                   5297: &register_handler("autocrsreqchecks", \&crsreq_checks_handler, 0, 1, 0);
                   5298: 
                   5299: sub validate_crsreq_handler {
                   5300:     my ($cmd, $tail, $client) = @_;
                   5301:     my $userinput = "$cmd:$tail";
                   5302:     my ($dom,$owner,$crstype,$inststatuslist,$instcode,$instseclist) = split(/:/, $tail);
                   5303:     $instcode = &unescape($instcode);
                   5304:     $owner = &unescape($owner);
                   5305:     $crstype = &unescape($crstype);
                   5306:     $inststatuslist = &unescape($inststatuslist);
                   5307:     $instcode = &unescape($instcode);
                   5308:     $instseclist = &unescape($instseclist);
                   5309:     my $outcome;
                   5310:     eval {
                   5311:         local($SIG{__DIE__})='DEFAULT';
                   5312:         $outcome = &localenroll::validate_crsreq($dom,$owner,$crstype,
                   5313:                                                  $inststatuslist,$instcode,
                   5314:                                                  $instseclist);
                   5315:     };
                   5316:     if (!$@) {
                   5317:         &Reply($client, \$outcome, $userinput);
                   5318:     } else {
                   5319:         &Failure($client,"unknown_cmd\n",$userinput);
                   5320:     }
                   5321:     return 1;
                   5322: }
                   5323: &register_handler("autocrsreqvalidation", \&validate_crsreq_handler, 0, 1, 0);
                   5324: 
1.248     foxr     5325: #
                   5326: #   Read and retrieve institutional code format (for support form).
                   5327: # Formal Parameters:
                   5328: #    $cmd        - Command that dispatched us.
                   5329: #    $tail       - Tail of the command.  In this case it conatins 
                   5330: #                  the course domain and the coursename.
                   5331: #    $client     - Socket open on the client.
                   5332: # Returns:
                   5333: #    1     - Continue processing.
                   5334: #
                   5335: sub get_institutional_code_format_handler {
                   5336:     my ($cmd, $tail, $client)   = @_;
                   5337:     my $userinput               = "$cmd:$tail";
                   5338: 
                   5339:     my $reply;
                   5340:     my($cdom,$course) = split(/:/,$tail);
                   5341:     my @pairs = split/\&/,$course;
                   5342:     my %instcodes = ();
                   5343:     my %codes = ();
                   5344:     my @codetitles = ();
                   5345:     my %cat_titles = ();
                   5346:     my %cat_order = ();
                   5347:     foreach (@pairs) {
                   5348: 	my ($key,$value) = split/=/,$_;
                   5349: 	$instcodes{&unescape($key)} = &unescape($value);
                   5350:     }
                   5351:     my $formatreply = &localenroll::instcode_format($cdom,
                   5352: 						    \%instcodes,
                   5353: 						    \%codes,
                   5354: 						    \@codetitles,
                   5355: 						    \%cat_titles,
                   5356: 						    \%cat_order);
                   5357:     if ($formatreply eq 'ok') {
1.365     albertel 5358: 	my $codes_str = &Apache::lonnet::hash2str(%codes);
                   5359: 	my $codetitles_str = &Apache::lonnet::array2str(@codetitles);
                   5360: 	my $cat_titles_str = &Apache::lonnet::hash2str(%cat_titles);
                   5361: 	my $cat_order_str = &Apache::lonnet::hash2str(%cat_order);
1.248     foxr     5362: 	&Reply($client,
                   5363: 	       $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
                   5364: 	       .$cat_order_str."\n",
                   5365: 	       $userinput);
                   5366:     } else {
                   5367: 	# this else branch added by RF since if not ok, lonc will
                   5368: 	# hang waiting on reply until timeout.
                   5369: 	#
                   5370: 	&Reply($client, "format_error\n", $userinput);
                   5371:     }
                   5372:     
                   5373:     return 1;
                   5374: }
1.265     albertel 5375: &register_handler("autoinstcodeformat",
                   5376: 		  \&get_institutional_code_format_handler,0,1,0);
1.246     foxr     5377: 
1.345     raeburn  5378: sub get_institutional_defaults_handler {
                   5379:     my ($cmd, $tail, $client)   = @_;
                   5380:     my $userinput               = "$cmd:$tail";
                   5381: 
                   5382:     my $dom = $tail;
                   5383:     my %defaults_hash;
                   5384:     my @code_order;
                   5385:     my $outcome;
                   5386:     eval {
                   5387:         local($SIG{__DIE__})='DEFAULT';
                   5388:         $outcome = &localenroll::instcode_defaults($dom,\%defaults_hash,
                   5389:                                                    \@code_order);
                   5390:     };
                   5391:     if (!$@) {
                   5392:         if ($outcome eq 'ok') {
                   5393:             my $result='';
                   5394:             while (my ($key,$value) = each(%defaults_hash)) {
                   5395:                 $result.=&escape($key).'='.&escape($value).'&';
                   5396:             }
                   5397:             $result .= 'code_order='.&escape(join('&',@code_order));
1.387     albertel 5398:             &Reply($client,\$result,$userinput);
1.345     raeburn  5399:         } else {
                   5400:             &Reply($client,"error\n", $userinput);
                   5401:         }
                   5402:     } else {
                   5403:         &Failure($client,"unknown_cmd\n",$userinput);
                   5404:     }
                   5405: }
                   5406: &register_handler("autoinstcodedefaults",
                   5407:                   \&get_institutional_defaults_handler,0,1,0);
                   5408: 
1.416     raeburn  5409: sub get_possible_instcodes_handler {
                   5410:     my ($cmd, $tail, $client)   = @_;
                   5411:     my $userinput               = "$cmd:$tail";
                   5412: 
                   5413:     my $reply;
                   5414:     my $cdom = $tail;
1.417     raeburn  5415:     my (@codetitles,%cat_titles,%cat_order,@code_order);
1.416     raeburn  5416:     my $formatreply = &localenroll::possible_instcodes($cdom,
                   5417:                                                        \@codetitles,
                   5418:                                                        \%cat_titles,
1.417     raeburn  5419:                                                        \%cat_order,
                   5420:                                                        \@code_order);
1.416     raeburn  5421:     if ($formatreply eq 'ok') {
                   5422:         my $result = join('&',map {&escape($_);} (@codetitles)).':';
1.417     raeburn  5423:         $result .= join('&',map {&escape($_);} (@code_order)).':';
1.416     raeburn  5424:         foreach my $key (keys(%cat_titles)) {
                   5425:             $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($cat_titles{$key}).'&';
                   5426:         }
                   5427:         $result =~ s/\&$//;
                   5428:         $result .= ':';
                   5429:         foreach my $key (keys(%cat_order)) {
                   5430:             $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($cat_order{$key}).'&';
                   5431:         }
                   5432:         $result =~ s/\&$//;
                   5433:         &Reply($client,\$result,$userinput);
                   5434:     } else {
                   5435:         &Reply($client, "format_error\n", $userinput);
                   5436:     }
                   5437:     return 1;
                   5438: }
                   5439: &register_handler("autopossibleinstcodes",
                   5440:                   \&get_possible_instcodes_handler,0,1,0);
                   5441: 
1.381     raeburn  5442: sub get_institutional_user_rules {
                   5443:     my ($cmd, $tail, $client)   = @_;
                   5444:     my $userinput               = "$cmd:$tail";
                   5445:     my $dom = &unescape($tail);
                   5446:     my (%rules_hash,@rules_order);
                   5447:     my $outcome;
                   5448:     eval {
                   5449:         local($SIG{__DIE__})='DEFAULT';
                   5450:         $outcome = &localenroll::username_rules($dom,\%rules_hash,\@rules_order);
                   5451:     };
                   5452:     if (!$@) {
                   5453:         if ($outcome eq 'ok') {
                   5454:             my $result;
                   5455:             foreach my $key (keys(%rules_hash)) {
                   5456:                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
                   5457:             }
                   5458:             $result =~ s/\&$//;
                   5459:             $result .= ':';
                   5460:             if (@rules_order > 0) {
                   5461:                 foreach my $item (@rules_order) {
                   5462:                     $result .= &escape($item).'&';
                   5463:                 }
                   5464:             }
                   5465:             $result =~ s/\&$//;
1.387     albertel 5466:             &Reply($client,\$result,$userinput);
1.381     raeburn  5467:         } else {
                   5468:             &Reply($client,"error\n", $userinput);
                   5469:         }
                   5470:     } else {
                   5471:         &Failure($client,"unknown_cmd\n",$userinput);
                   5472:     }
                   5473: }
                   5474: &register_handler("instuserrules",\&get_institutional_user_rules,0,1,0);
                   5475: 
1.389     raeburn  5476: sub get_institutional_id_rules {
                   5477:     my ($cmd, $tail, $client)   = @_;
                   5478:     my $userinput               = "$cmd:$tail";
                   5479:     my $dom = &unescape($tail);
                   5480:     my (%rules_hash,@rules_order);
                   5481:     my $outcome;
                   5482:     eval {
                   5483:         local($SIG{__DIE__})='DEFAULT';
                   5484:         $outcome = &localenroll::id_rules($dom,\%rules_hash,\@rules_order);
                   5485:     };
                   5486:     if (!$@) {
                   5487:         if ($outcome eq 'ok') {
                   5488:             my $result;
                   5489:             foreach my $key (keys(%rules_hash)) {
                   5490:                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
                   5491:             }
                   5492:             $result =~ s/\&$//;
                   5493:             $result .= ':';
                   5494:             if (@rules_order > 0) {
                   5495:                 foreach my $item (@rules_order) {
                   5496:                     $result .= &escape($item).'&';
                   5497:                 }
                   5498:             }
                   5499:             $result =~ s/\&$//;
                   5500:             &Reply($client,\$result,$userinput);
                   5501:         } else {
                   5502:             &Reply($client,"error\n", $userinput);
                   5503:         }
                   5504:     } else {
                   5505:         &Failure($client,"unknown_cmd\n",$userinput);
                   5506:     }
                   5507: }
                   5508: &register_handler("instidrules",\&get_institutional_id_rules,0,1,0);
                   5509: 
1.397     raeburn  5510: sub get_institutional_selfcreate_rules {
1.396     raeburn  5511:     my ($cmd, $tail, $client)   = @_;
                   5512:     my $userinput               = "$cmd:$tail";
                   5513:     my $dom = &unescape($tail);
                   5514:     my (%rules_hash,@rules_order);
                   5515:     my $outcome;
                   5516:     eval {
                   5517:         local($SIG{__DIE__})='DEFAULT';
1.397     raeburn  5518:         $outcome = &localenroll::selfcreate_rules($dom,\%rules_hash,\@rules_order);
1.396     raeburn  5519:     };
                   5520:     if (!$@) {
                   5521:         if ($outcome eq 'ok') {
                   5522:             my $result;
                   5523:             foreach my $key (keys(%rules_hash)) {
                   5524:                 $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rules_hash{$key}).'&';
                   5525:             }
                   5526:             $result =~ s/\&$//;
                   5527:             $result .= ':';
                   5528:             if (@rules_order > 0) {
                   5529:                 foreach my $item (@rules_order) {
                   5530:                     $result .= &escape($item).'&';
                   5531:                 }
                   5532:             }
                   5533:             $result =~ s/\&$//;
                   5534:             &Reply($client,\$result,$userinput);
                   5535:         } else {
                   5536:             &Reply($client,"error\n", $userinput);
                   5537:         }
                   5538:     } else {
                   5539:         &Failure($client,"unknown_cmd\n",$userinput);
                   5540:     }
                   5541: }
1.397     raeburn  5542: &register_handler("instemailrules",\&get_institutional_selfcreate_rules,0,1,0);
1.396     raeburn  5543: 
1.381     raeburn  5544: 
                   5545: sub institutional_username_check {
                   5546:     my ($cmd, $tail, $client)   = @_;
                   5547:     my $userinput               = "$cmd:$tail";
                   5548:     my %rulecheck;
                   5549:     my $outcome;
                   5550:     my ($udom,$uname,@rules) = split(/:/,$tail);
                   5551:     $udom = &unescape($udom);
                   5552:     $uname = &unescape($uname);
                   5553:     @rules = map {&unescape($_);} (@rules);
                   5554:     eval {
                   5555:         local($SIG{__DIE__})='DEFAULT';
                   5556:         $outcome = &localenroll::username_check($udom,$uname,\@rules,\%rulecheck);
                   5557:     };
                   5558:     if (!$@) {
                   5559:         if ($outcome eq 'ok') {
                   5560:             my $result='';
                   5561:             foreach my $key (keys(%rulecheck)) {
                   5562:                 $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
                   5563:             }
1.387     albertel 5564:             &Reply($client,\$result,$userinput);
1.381     raeburn  5565:         } else {
                   5566:             &Reply($client,"error\n", $userinput);
                   5567:         }
                   5568:     } else {
                   5569:         &Failure($client,"unknown_cmd\n",$userinput);
                   5570:     }
                   5571: }
                   5572: &register_handler("instrulecheck",\&institutional_username_check,0,1,0);
                   5573: 
1.389     raeburn  5574: sub institutional_id_check {
                   5575:     my ($cmd, $tail, $client)   = @_;
                   5576:     my $userinput               = "$cmd:$tail";
                   5577:     my %rulecheck;
                   5578:     my $outcome;
                   5579:     my ($udom,$id,@rules) = split(/:/,$tail);
                   5580:     $udom = &unescape($udom);
                   5581:     $id = &unescape($id);
                   5582:     @rules = map {&unescape($_);} (@rules);
                   5583:     eval {
                   5584:         local($SIG{__DIE__})='DEFAULT';
                   5585:         $outcome = &localenroll::id_check($udom,$id,\@rules,\%rulecheck);
                   5586:     };
                   5587:     if (!$@) {
                   5588:         if ($outcome eq 'ok') {
                   5589:             my $result='';
                   5590:             foreach my $key (keys(%rulecheck)) {
                   5591:                 $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
                   5592:             }
                   5593:             &Reply($client,\$result,$userinput);
                   5594:         } else {
                   5595:             &Reply($client,"error\n", $userinput);
                   5596:         }
                   5597:     } else {
                   5598:         &Failure($client,"unknown_cmd\n",$userinput);
                   5599:     }
                   5600: }
                   5601: &register_handler("instidrulecheck",\&institutional_id_check,0,1,0);
1.345     raeburn  5602: 
1.397     raeburn  5603: sub institutional_selfcreate_check {
1.396     raeburn  5604:     my ($cmd, $tail, $client)   = @_;
                   5605:     my $userinput               = "$cmd:$tail";
                   5606:     my %rulecheck;
                   5607:     my $outcome;
                   5608:     my ($udom,$email,@rules) = split(/:/,$tail);
                   5609:     $udom = &unescape($udom);
                   5610:     $email = &unescape($email);
                   5611:     @rules = map {&unescape($_);} (@rules);
                   5612:     eval {
                   5613:         local($SIG{__DIE__})='DEFAULT';
1.397     raeburn  5614:         $outcome = &localenroll::selfcreate_check($udom,$email,\@rules,\%rulecheck);
1.396     raeburn  5615:     };
                   5616:     if (!$@) {
                   5617:         if ($outcome eq 'ok') {
                   5618:             my $result='';
                   5619:             foreach my $key (keys(%rulecheck)) {
                   5620:                 $result.=&escape($key).'='.&Apache::lonnet::freeze_escape($rulecheck{$key}).'&';
                   5621:             }
                   5622:             &Reply($client,\$result,$userinput);
                   5623:         } else {
                   5624:             &Reply($client,"error\n", $userinput);
                   5625:         }
                   5626:     } else {
                   5627:         &Failure($client,"unknown_cmd\n",$userinput);
                   5628:     }
                   5629: }
1.397     raeburn  5630: &register_handler("instselfcreatecheck",\&institutional_selfcreate_check,0,1,0);
1.396     raeburn  5631: 
1.317     raeburn  5632: # Get domain specific conditions for import of student photographs to a course
                   5633: #
                   5634: # Retrieves information from photo_permission subroutine in localenroll.
                   5635: # Returns outcome (ok) if no processing errors, and whether course owner is 
                   5636: # required to accept conditions of use (yes/no).
                   5637: #
                   5638: #    
                   5639: sub photo_permission_handler {
                   5640:     my ($cmd, $tail, $client)   = @_;
                   5641:     my $userinput               = "$cmd:$tail";
                   5642:     my $cdom = $tail;
                   5643:     my ($perm_reqd,$conditions);
1.320     albertel 5644:     my $outcome;
                   5645:     eval {
                   5646: 	local($SIG{__DIE__})='DEFAULT';
                   5647: 	$outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
                   5648: 						  \$conditions);
                   5649:     };
                   5650:     if (!$@) {
                   5651: 	&Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
                   5652: 	       $userinput);
                   5653:     } else {
                   5654: 	&Failure($client,"unknown_cmd\n",$userinput);
                   5655:     }
                   5656:     return 1;
1.317     raeburn  5657: }
                   5658: &register_handler("autophotopermission",\&photo_permission_handler,0,1,0);
                   5659: 
                   5660: #
                   5661: # Checks if student photo is available for a user in the domain, in the user's
                   5662: # directory (in /userfiles/internal/studentphoto.jpg).
                   5663: # Uses localstudentphoto:fetch() to ensure there is an up to date copy of
                   5664: # the student's photo.   
                   5665: 
                   5666: sub photo_check_handler {
                   5667:     my ($cmd, $tail, $client)   = @_;
                   5668:     my $userinput               = "$cmd:$tail";
                   5669:     my ($udom,$uname,$pid) = split(/:/,$tail);
                   5670:     $udom = &unescape($udom);
                   5671:     $uname = &unescape($uname);
                   5672:     $pid = &unescape($pid);
                   5673:     my $path=&propath($udom,$uname).'/userfiles/internal/';
                   5674:     if (!-e $path) {
                   5675:         &mkpath($path);
                   5676:     }
                   5677:     my $response;
                   5678:     my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
                   5679:     $result .= ':'.$response;
                   5680:     &Reply($client, &escape($result)."\n",$userinput);
1.320     albertel 5681:     return 1;
1.317     raeburn  5682: }
                   5683: &register_handler("autophotocheck",\&photo_check_handler,0,1,0);
                   5684: 
                   5685: #
                   5686: # Retrieve information from localenroll about whether to provide a button     
                   5687: # for users who have enbled import of student photos to initiate an 
                   5688: # update of photo files for registered students. Also include 
                   5689: # comment to display alongside button.  
                   5690: 
                   5691: sub photo_choice_handler {
                   5692:     my ($cmd, $tail, $client) = @_;
                   5693:     my $userinput             = "$cmd:$tail";
                   5694:     my $cdom                  = &unescape($tail);
1.320     albertel 5695:     my ($update,$comment);
                   5696:     eval {
                   5697: 	local($SIG{__DIE__})='DEFAULT';
                   5698: 	($update,$comment)    = &localenroll::manager_photo_update($cdom);
                   5699:     };
                   5700:     if (!$@) {
                   5701: 	&Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput);
                   5702:     } else {
                   5703: 	&Failure($client,"unknown_cmd\n",$userinput);
                   5704:     }
                   5705:     return 1;
1.317     raeburn  5706: }
                   5707: &register_handler("autophotochoice",\&photo_choice_handler,0,1,0);
                   5708: 
1.265     albertel 5709: #
                   5710: # Gets a student's photo to exist (in the correct image type) in the user's 
                   5711: # directory.
                   5712: # Formal Parameters:
                   5713: #    $cmd     - The command request that got us dispatched.
                   5714: #    $tail    - A colon separated set of words that will be split into:
                   5715: #               $domain - student's domain
                   5716: #               $uname  - student username
                   5717: #               $type   - image type desired
                   5718: #    $client  - The socket open on the client.
                   5719: # Returns:
                   5720: #    1 - continue processing.
1.317     raeburn  5721: 
1.265     albertel 5722: sub student_photo_handler {
                   5723:     my ($cmd, $tail, $client) = @_;
1.317     raeburn  5724:     my ($domain,$uname,$ext,$type) = split(/:/, $tail);
1.265     albertel 5725: 
1.317     raeburn  5726:     my $path=&propath($domain,$uname). '/userfiles/internal/';
                   5727:     my $filename = 'studentphoto.'.$ext;
                   5728:     if ($type eq 'thumbnail') {
                   5729:         $filename = 'studentphoto_tn.'.$ext;
                   5730:     }
                   5731:     if (-e $path.$filename) {
1.265     albertel 5732: 	&Reply($client,"ok\n","$cmd:$tail");
                   5733: 	return 1;
                   5734:     }
                   5735:     &mkpath($path);
1.317     raeburn  5736:     my $file;
                   5737:     if ($type eq 'thumbnail') {
1.320     albertel 5738: 	eval {
                   5739: 	    local($SIG{__DIE__})='DEFAULT';
                   5740: 	    $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
                   5741: 	};
1.317     raeburn  5742:     } else {
                   5743:         $file=&localstudentphoto::fetch($domain,$uname);
                   5744:     }
1.265     albertel 5745:     if (!$file) {
                   5746: 	&Failure($client,"unavailable\n","$cmd:$tail");
                   5747: 	return 1;
                   5748:     }
1.317     raeburn  5749:     if (!-e $path.$filename) { &convert_photo($file,$path.$filename); }
                   5750:     if (-e $path.$filename) {
1.265     albertel 5751: 	&Reply($client,"ok\n","$cmd:$tail");
                   5752: 	return 1;
                   5753:     }
                   5754:     &Failure($client,"unable_to_convert\n","$cmd:$tail");
                   5755:     return 1;
                   5756: }
                   5757: &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
1.246     foxr     5758: 
1.361     raeburn  5759: sub inst_usertypes_handler {
                   5760:     my ($cmd, $domain, $client) = @_;
                   5761:     my $res;
                   5762:     my $userinput = $cmd.":".$domain; # For logging purposes.
1.370     albertel 5763:     my (%typeshash,@order,$result);
                   5764:     eval {
                   5765: 	local($SIG{__DIE__})='DEFAULT';
                   5766: 	$result=&localenroll::inst_usertypes($domain,\%typeshash,\@order);
                   5767:     };
                   5768:     if ($result eq 'ok') {
1.361     raeburn  5769:         if (keys(%typeshash) > 0) {
                   5770:             foreach my $key (keys(%typeshash)) {
                   5771:                 $res.=&escape($key).'='.&escape($typeshash{$key}).'&';
                   5772:             }
                   5773:         }
                   5774:         $res=~s/\&$//;
                   5775:         $res .= ':';
                   5776:         if (@order > 0) {
                   5777:             foreach my $item (@order) {
                   5778:                 $res .= &escape($item).'&';
                   5779:             }
                   5780:         }
                   5781:         $res=~s/\&$//;
                   5782:     }
1.387     albertel 5783:     &Reply($client, \$res, $userinput);
1.361     raeburn  5784:     return 1;
                   5785: }
                   5786: &register_handler("inst_usertypes", \&inst_usertypes_handler, 0, 1, 0);
                   5787: 
1.264     albertel 5788: # mkpath makes all directories for a file, expects an absolute path with a
                   5789: # file or a trailing / if just a dir is passed
                   5790: # returns 1 on success 0 on failure
                   5791: sub mkpath {
                   5792:     my ($file)=@_;
                   5793:     my @parts=split(/\//,$file,-1);
                   5794:     my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
                   5795:     for (my $i=3;$i<= ($#parts-1);$i++) {
1.265     albertel 5796: 	$now.='/'.$parts[$i]; 
1.264     albertel 5797: 	if (!-e $now) {
                   5798: 	    if  (!mkdir($now,0770)) { return 0; }
                   5799: 	}
                   5800:     }
                   5801:     return 1;
                   5802: }
                   5803: 
1.207     foxr     5804: #---------------------------------------------------------------
                   5805: #
                   5806: #   Getting, decoding and dispatching requests:
                   5807: #
                   5808: #
                   5809: #   Get a Request:
                   5810: #   Gets a Request message from the client.  The transaction
                   5811: #   is defined as a 'line' of text.  We remove the new line
                   5812: #   from the text line.  
1.226     foxr     5813: #
1.211     albertel 5814: sub get_request {
1.207     foxr     5815:     my $input = <$client>;
                   5816:     chomp($input);
1.226     foxr     5817: 
1.234     foxr     5818:     &Debug("get_request: Request = $input\n");
1.207     foxr     5819: 
                   5820:     &status('Processing '.$clientname.':'.$input);
                   5821: 
                   5822:     return $input;
                   5823: }
1.212     foxr     5824: #---------------------------------------------------------------
                   5825: #
                   5826: #  Process a request.  This sub should shrink as each action
                   5827: #  gets farmed out into a separat sub that is registered 
                   5828: #  with the dispatch hash.  
                   5829: #
                   5830: # Parameters:
                   5831: #    user_input   - The request received from the client (lonc).
                   5832: # Returns:
                   5833: #    true to keep processing, false if caller should exit.
                   5834: #
                   5835: sub process_request {
                   5836:     my ($userinput) = @_;      # Easier for now to break style than to
                   5837:                                 # fix all the userinput -> user_input.
                   5838:     my $wasenc    = 0;		# True if request was encrypted.
                   5839: # ------------------------------------------------------------ See if encrypted
1.322     albertel 5840:     # for command
                   5841:     # sethost:<server>
                   5842:     # <command>:<args>
                   5843:     #   we just send it to the processor
                   5844:     # for
                   5845:     # sethost:<server>:<command>:<args>
                   5846:     #  we do the implict set host and then do the command
                   5847:     if ($userinput =~ /^sethost:/) {
                   5848: 	(my $cmd,my $newid,$userinput) = split(':',$userinput,3);
                   5849: 	if (defined($userinput)) {
                   5850: 	    &sethost("$cmd:$newid");
                   5851: 	} else {
                   5852: 	    $userinput = "$cmd:$newid";
                   5853: 	}
                   5854:     }
                   5855: 
1.212     foxr     5856:     if ($userinput =~ /^enc/) {
                   5857: 	$userinput = decipher($userinput);
                   5858: 	$wasenc=1;
                   5859: 	if(!$userinput) {	# Cipher not defined.
1.251     foxr     5860: 	    &Failure($client, "error: Encrypted data without negotated key\n");
1.212     foxr     5861: 	    return 0;
                   5862: 	}
                   5863:     }
                   5864:     Debug("process_request: $userinput\n");
                   5865:     
1.213     foxr     5866:     #  
                   5867:     #   The 'correct way' to add a command to lond is now to
                   5868:     #   write a sub to execute it and Add it to the command dispatch
                   5869:     #   hash via a call to register_handler..  The comments to that
                   5870:     #   sub should give you enough to go on to show how to do this
                   5871:     #   along with the examples that are building up as this code
                   5872:     #   is getting refactored.   Until all branches of the
                   5873:     #   if/elseif monster below have been factored out into
                   5874:     #   separate procesor subs, if the dispatch hash is missing
                   5875:     #   the command keyword, we will fall through to the remainder
                   5876:     #   of the if/else chain below in order to keep this thing in 
                   5877:     #   working order throughout the transmogrification.
                   5878: 
                   5879:     my ($command, $tail) = split(/:/, $userinput, 2);
                   5880:     chomp($command);
                   5881:     chomp($tail);
                   5882:     $tail =~ s/(\r)//;		# This helps people debugging with e.g. telnet.
1.214     foxr     5883:     $command =~ s/(\r)//;	# And this too for parameterless commands.
                   5884:     if(!$tail) {
                   5885: 	$tail ="";		# defined but blank.
                   5886:     }
1.213     foxr     5887: 
                   5888:     &Debug("Command received: $command, encoded = $wasenc");
                   5889: 
                   5890:     if(defined $Dispatcher{$command}) {
                   5891: 
                   5892: 	my $dispatch_info = $Dispatcher{$command};
                   5893: 	my $handler       = $$dispatch_info[0];
                   5894: 	my $need_encode   = $$dispatch_info[1];
                   5895: 	my $client_types  = $$dispatch_info[2];
                   5896: 	Debug("Matched dispatch hash: mustencode: $need_encode "
                   5897: 	      ."ClientType $client_types");
                   5898:       
                   5899: 	#  Validate the request:
                   5900:       
                   5901: 	my $ok = 1;
                   5902: 	my $requesterprivs = 0;
                   5903: 	if(&isClient()) {
                   5904: 	    $requesterprivs |= $CLIENT_OK;
                   5905: 	}
                   5906: 	if(&isManager()) {
                   5907: 	    $requesterprivs |= $MANAGER_OK;
                   5908: 	}
                   5909: 	if($need_encode && (!$wasenc)) {
                   5910: 	    Debug("Must encode but wasn't: $need_encode $wasenc");
                   5911: 	    $ok = 0;
                   5912: 	}
                   5913: 	if(($client_types & $requesterprivs) == 0) {
                   5914: 	    Debug("Client not privileged to do this operation");
                   5915: 	    $ok = 0;
                   5916: 	}
                   5917: 
                   5918: 	if($ok) {
                   5919: 	    Debug("Dispatching to handler $command $tail");
                   5920: 	    my $keep_going = &$handler($command, $tail, $client);
                   5921: 	    return $keep_going;
                   5922: 	} else {
                   5923: 	    Debug("Refusing to dispatch because client did not match requirements");
                   5924: 	    Failure($client, "refused\n", $userinput);
                   5925: 	    return 1;
                   5926: 	}
                   5927: 
                   5928:     }    
                   5929: 
1.262     foxr     5930:     print $client "unknown_cmd\n";
1.212     foxr     5931: # -------------------------------------------------------------------- complete
                   5932:     Debug("process_request - returning 1");
                   5933:     return 1;
                   5934: }
1.207     foxr     5935: #
                   5936: #   Decipher encoded traffic
                   5937: #  Parameters:
                   5938: #     input      - Encoded data.
                   5939: #  Returns:
                   5940: #     Decoded data or undef if encryption key was not yet negotiated.
                   5941: #  Implicit input:
                   5942: #     cipher  - This global holds the negotiated encryption key.
                   5943: #
1.211     albertel 5944: sub decipher {
1.207     foxr     5945:     my ($input)  = @_;
                   5946:     my $output = '';
1.212     foxr     5947:     
                   5948:     
1.207     foxr     5949:     if($cipher) {
                   5950: 	my($enc, $enclength, $encinput) = split(/:/, $input);
                   5951: 	for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
                   5952: 	    $output .= 
                   5953: 		$cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
                   5954: 	}
                   5955: 	return substr($output, 0, $enclength);
                   5956:     } else {
                   5957: 	return undef;
                   5958:     }
                   5959: }
                   5960: 
                   5961: #
                   5962: #   Register a command processor.  This function is invoked to register a sub
                   5963: #   to process a request.  Once registered, the ProcessRequest sub can automatically
                   5964: #   dispatch requests to an appropriate sub, and do the top level validity checking
                   5965: #   as well:
                   5966: #    - Is the keyword recognized.
                   5967: #    - Is the proper client type attempting the request.
                   5968: #    - Is the request encrypted if it has to be.
                   5969: #   Parameters:
                   5970: #    $request_name         - Name of the request being registered.
                   5971: #                           This is the command request that will match
                   5972: #                           against the hash keywords to lookup the information
                   5973: #                           associated with the dispatch information.
                   5974: #    $procedure           - Reference to a sub to call to process the request.
                   5975: #                           All subs get called as follows:
                   5976: #                             Procedure($cmd, $tail, $replyfd, $key)
                   5977: #                             $cmd    - the actual keyword that invoked us.
                   5978: #                             $tail   - the tail of the request that invoked us.
                   5979: #                             $replyfd- File descriptor connected to the client
                   5980: #    $must_encode          - True if the request must be encoded to be good.
                   5981: #    $client_ok            - True if it's ok for a client to request this.
                   5982: #    $manager_ok           - True if it's ok for a manager to request this.
                   5983: # Side effects:
                   5984: #      - On success, the Dispatcher hash has an entry added for the key $RequestName
                   5985: #      - On failure, the program will die as it's a bad internal bug to try to 
                   5986: #        register a duplicate command handler.
                   5987: #
1.211     albertel 5988: sub register_handler {
1.212     foxr     5989:     my ($request_name,$procedure,$must_encode,	$client_ok,$manager_ok)   = @_;
1.207     foxr     5990: 
                   5991:     #  Don't allow duplication#
                   5992:    
                   5993:     if (defined $Dispatcher{$request_name}) {
                   5994: 	die "Attempting to define a duplicate request handler for $request_name\n";
                   5995:     }
                   5996:     #   Build the client type mask:
                   5997:     
                   5998:     my $client_type_mask = 0;
                   5999:     if($client_ok) {
                   6000: 	$client_type_mask  |= $CLIENT_OK;
                   6001:     }
                   6002:     if($manager_ok) {
                   6003: 	$client_type_mask  |= $MANAGER_OK;
                   6004:     }
                   6005:    
                   6006:     #  Enter the hash:
                   6007:       
                   6008:     my @entry = ($procedure, $must_encode, $client_type_mask);
                   6009:    
                   6010:     $Dispatcher{$request_name} = \@entry;
                   6011:    
                   6012: }
                   6013: 
                   6014: 
                   6015: #------------------------------------------------------------------
                   6016: 
                   6017: 
                   6018: 
                   6019: 
1.141     foxr     6020: #
1.96      foxr     6021: #  Convert an error return code from lcpasswd to a string value.
                   6022: #
                   6023: sub lcpasswdstrerror {
                   6024:     my $ErrorCode = shift;
1.97      foxr     6025:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96      foxr     6026: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
                   6027:     } else {
1.98      foxr     6028: 	return $passwderrors[$ErrorCode];
1.96      foxr     6029:     }
                   6030: }
                   6031: 
1.97      foxr     6032: #
                   6033: # Convert an error return code from lcuseradd to a string value:
                   6034: #
                   6035: sub lcuseraddstrerror {
                   6036:     my $ErrorCode = shift;
                   6037:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
                   6038: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
                   6039:     } else {
1.98      foxr     6040: 	return $adderrors[$ErrorCode];
1.97      foxr     6041:     }
                   6042: }
                   6043: 
1.23      harris41 6044: # grabs exception and records it to log before exiting
                   6045: sub catchexception {
1.27      albertel 6046:     my ($error)=@_;
1.25      www      6047:     $SIG{'QUIT'}='DEFAULT';
                   6048:     $SIG{__DIE__}='DEFAULT';
1.165     albertel 6049:     &status("Catching exception");
1.190     albertel 6050:     &logthis("<font color='red'>CRITICAL: "
1.373     albertel 6051:      ."ABNORMAL EXIT. Child $$ for server ".$perlvar{'lonHostID'}." died through "
1.27      albertel 6052:      ."a crash with this error msg->[$error]</font>");
1.57      www      6053:     &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27      albertel 6054:     if ($client) { print $client "error: $error\n"; }
1.59      www      6055:     $server->close();
1.27      albertel 6056:     die($error);
1.23      harris41 6057: }
1.63      www      6058: sub timeout {
1.165     albertel 6059:     &status("Handling Timeout");
1.190     albertel 6060:     &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
1.63      www      6061:     &catchexception('Timeout');
                   6062: }
1.22      harris41 6063: # -------------------------------- Set signal handlers to record abnormal exits
                   6064: 
1.226     foxr     6065: 
1.22      harris41 6066: $SIG{'QUIT'}=\&catchexception;
                   6067: $SIG{__DIE__}=\&catchexception;
                   6068: 
1.81      matthew  6069: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95      harris41 6070: &status("Read loncapa.conf and loncapa_apache.conf");
                   6071: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141     foxr     6072: %perlvar=%{$perlvarref};
1.80      harris41 6073: undef $perlvarref;
1.19      www      6074: 
1.35      harris41 6075: # ----------------------------- Make sure this process is running from user=www
                   6076: my $wwwid=getpwnam('www');
                   6077: if ($wwwid!=$<) {
1.134     albertel 6078:    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   6079:    my $subj="LON: $currenthostid User ID mismatch";
1.37      harris41 6080:    system("echo 'User ID mismatch.  lond must be run as user www.' |\
1.35      harris41 6081:  mailto $emailto -s '$subj' > /dev/null");
                   6082:    exit 1;
                   6083: }
                   6084: 
1.19      www      6085: # --------------------------------------------- Check if other instance running
                   6086: 
                   6087: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
                   6088: 
                   6089: if (-e $pidfile) {
                   6090:    my $lfh=IO::File->new("$pidfile");
                   6091:    my $pide=<$lfh>;
                   6092:    chomp($pide);
1.29      harris41 6093:    if (kill 0 => $pide) { die "already running"; }
1.19      www      6094: }
1.1       albertel 6095: 
                   6096: # ------------------------------------------------------------- Read hosts file
                   6097: 
                   6098: 
                   6099: 
                   6100: # establish SERVER socket, bind and listen.
                   6101: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                   6102:                                 Type      => SOCK_STREAM,
                   6103:                                 Proto     => 'tcp',
1.469     foxr     6104:                                 ReuseAddr     => 1,
1.1       albertel 6105:                                 Listen    => 10 )
1.29      harris41 6106:   or die "making socket: $@\n";
1.1       albertel 6107: 
                   6108: # --------------------------------------------------------- Do global variables
                   6109: 
                   6110: # global variables
                   6111: 
1.134     albertel 6112: my %children               = ();       # keys are current child process IDs
1.1       albertel 6113: 
                   6114: sub REAPER {                        # takes care of dead children
                   6115:     $SIG{CHLD} = \&REAPER;
1.165     albertel 6116:     &status("Handling child death");
1.178     foxr     6117:     my $pid;
                   6118:     do {
                   6119: 	$pid = waitpid(-1,&WNOHANG());
                   6120: 	if (defined($children{$pid})) {
                   6121: 	    &logthis("Child $pid died");
                   6122: 	    delete($children{$pid});
1.183     albertel 6123: 	} elsif ($pid > 0) {
1.178     foxr     6124: 	    &logthis("Unknown Child $pid died");
                   6125: 	}
                   6126:     } while ( $pid > 0 );
                   6127:     foreach my $child (keys(%children)) {
                   6128: 	$pid = waitpid($child,&WNOHANG());
                   6129: 	if ($pid > 0) {
                   6130: 	    &logthis("Child $child - $pid looks like we missed it's death");
                   6131: 	    delete($children{$pid});
                   6132: 	}
1.176     albertel 6133:     }
1.165     albertel 6134:     &status("Finished Handling child death");
1.1       albertel 6135: }
                   6136: 
                   6137: sub HUNTSMAN {                      # signal handler for SIGINT
1.165     albertel 6138:     &status("Killing children (INT)");
1.1       albertel 6139:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                   6140:     kill 'INT' => keys %children;
1.59      www      6141:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1       albertel 6142:     my $execdir=$perlvar{'lonDaemons'};
                   6143:     unlink("$execdir/logs/lond.pid");
1.190     albertel 6144:     &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.165     albertel 6145:     &status("Done killing children");
1.1       albertel 6146:     exit;                           # clean up with dignity
                   6147: }
                   6148: 
                   6149: sub HUPSMAN {                      # signal handler for SIGHUP
                   6150:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
1.165     albertel 6151:     &status("Killing children for restart (HUP)");
1.1       albertel 6152:     kill 'INT' => keys %children;
1.59      www      6153:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.190     albertel 6154:     &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.134     albertel 6155:     my $execdir=$perlvar{'lonDaemons'};
1.30      harris41 6156:     unlink("$execdir/logs/lond.pid");
1.165     albertel 6157:     &status("Restarting self (HUP)");
1.1       albertel 6158:     exec("$execdir/lond");         # here we go again
                   6159: }
                   6160: 
1.144     foxr     6161: #
1.148     foxr     6162: #  Reload the Apache daemon's state.
1.150     foxr     6163: #  This is done by invoking /home/httpd/perl/apachereload
                   6164: #  a setuid perl script that can be root for us to do this job.
1.148     foxr     6165: #
                   6166: sub ReloadApache {
1.473     raeburn  6167: # --------------------------- Handle case of another apachereload process (locking)
1.474     raeburn  6168:     if (&LONCAPA::try_to_lock('/tmp/lock_apachereload')) {
                   6169:         my $execdir = $perlvar{'lonDaemons'};
                   6170:         my $script  = $execdir."/apachereload";
                   6171:         system($script);
                   6172:         unlink('/tmp/lock_apachereload'); #  Remove the lock file.
                   6173:     }
1.148     foxr     6174: }
                   6175: 
                   6176: #
1.144     foxr     6177: #   Called in response to a USR2 signal.
                   6178: #   - Reread hosts.tab
                   6179: #   - All children connected to hosts that were removed from hosts.tab
                   6180: #     are killed via SIGINT
                   6181: #   - All children connected to previously existing hosts are sent SIGUSR1
                   6182: #   - Our internal hosts hash is updated to reflect the new contents of
                   6183: #     hosts.tab causing connections from hosts added to hosts.tab to
                   6184: #     now be honored.
                   6185: #
                   6186: sub UpdateHosts {
1.165     albertel 6187:     &status("Reload hosts.tab");
1.147     foxr     6188:     logthis('<font color="blue"> Updating connections </font>');
1.148     foxr     6189:     #
                   6190:     #  The %children hash has the set of IP's we currently have children
                   6191:     #  on.  These need to be matched against records in the hosts.tab
                   6192:     #  Any ip's no longer in the table get killed off they correspond to
                   6193:     #  either dropped or changed hosts.  Note that the re-read of the table
                   6194:     #  will take care of new and changed hosts as connections come into being.
                   6195: 
1.371     albertel 6196:     &Apache::lonnet::reset_hosts_info();
1.148     foxr     6197: 
1.368     albertel 6198:     foreach my $child (keys(%children)) {
1.148     foxr     6199: 	my $childip = $children{$child};
1.374     albertel 6200: 	if ($childip ne '127.0.0.1'
                   6201: 	    && !defined(&Apache::lonnet::get_hosts_from_ip($childip))) {
1.149     foxr     6202: 	    logthis('<font color="blue"> UpdateHosts killing child '
                   6203: 		    ." $child for ip $childip </font>");
1.148     foxr     6204: 	    kill('INT', $child);
1.149     foxr     6205: 	} else {
                   6206: 	    logthis('<font color="green"> keeping child for ip '
                   6207: 		    ." $childip (pid=$child) </font>");
1.148     foxr     6208: 	}
                   6209:     }
                   6210:     ReloadApache;
1.165     albertel 6211:     &status("Finished reloading hosts.tab");
1.144     foxr     6212: }
                   6213: 
1.148     foxr     6214: 
1.57      www      6215: sub checkchildren {
1.165     albertel 6216:     &status("Checking on the children (sending signals)");
1.57      www      6217:     &initnewstatus();
                   6218:     &logstatus();
                   6219:     &logthis('Going to check on the children');
1.134     albertel 6220:     my $docdir=$perlvar{'lonDocRoot'};
1.61      harris41 6221:     foreach (sort keys %children) {
1.221     albertel 6222: 	#sleep 1;
1.57      www      6223:         unless (kill 'USR1' => $_) {
                   6224: 	    &logthis ('Child '.$_.' is dead');
                   6225:             &logstatus($$.' is dead');
1.221     albertel 6226: 	    delete($children{$_});
1.57      www      6227:         } 
1.61      harris41 6228:     }
1.63      www      6229:     sleep 5;
1.212     foxr     6230:     $SIG{ALRM} = sub { Debug("timeout"); 
                   6231: 		       die "timeout";  };
1.113     albertel 6232:     $SIG{__DIE__} = 'DEFAULT';
1.165     albertel 6233:     &status("Checking on the children (waiting for reports)");
1.63      www      6234:     foreach (sort keys %children) {
                   6235:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.113     albertel 6236:           eval {
                   6237:             alarm(300);
1.63      www      6238: 	    &logthis('Child '.$_.' did not respond');
1.67      albertel 6239: 	    kill 9 => $_;
1.131     albertel 6240: 	    #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   6241: 	    #$subj="LON: $currenthostid killed lond process $_";
                   6242: 	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
                   6243: 	    #$execdir=$perlvar{'lonDaemons'};
                   6244: 	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
1.221     albertel 6245: 	    delete($children{$_});
1.113     albertel 6246: 	    alarm(0);
                   6247: 	  }
1.63      www      6248:         }
                   6249:     }
1.113     albertel 6250:     $SIG{ALRM} = 'DEFAULT';
1.155     albertel 6251:     $SIG{__DIE__} = \&catchexception;
1.165     albertel 6252:     &status("Finished checking children");
1.221     albertel 6253:     &logthis('Finished Checking children');
1.57      www      6254: }
                   6255: 
1.1       albertel 6256: # --------------------------------------------------------------------- Logging
                   6257: 
                   6258: sub logthis {
                   6259:     my $message=shift;
                   6260:     my $execdir=$perlvar{'lonDaemons'};
                   6261:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
                   6262:     my $now=time;
                   6263:     my $local=localtime($now);
1.58      www      6264:     $lastlog=$local.': '.$message;
1.1       albertel 6265:     print $fh "$local ($$): $message\n";
                   6266: }
                   6267: 
1.77      foxr     6268: # ------------------------- Conditional log if $DEBUG true.
                   6269: sub Debug {
                   6270:     my $message = shift;
                   6271:     if($DEBUG) {
                   6272: 	&logthis($message);
                   6273:     }
                   6274: }
1.161     foxr     6275: 
                   6276: #
                   6277: #   Sub to do replies to client.. this gives a hook for some
                   6278: #   debug tracing too:
                   6279: #  Parameters:
                   6280: #     fd      - File open on client.
                   6281: #     reply   - Text to send to client.
                   6282: #     request - Original request from client.
                   6283: #
                   6284: sub Reply {
1.192     foxr     6285:     my ($fd, $reply, $request) = @_;
1.387     albertel 6286:     if (ref($reply)) {
                   6287: 	print $fd $$reply;
                   6288: 	print $fd "\n";
                   6289: 	if ($DEBUG) { Debug("Request was $request  Reply was $$reply"); }
                   6290:     } else {
                   6291: 	print $fd $reply;
                   6292: 	if ($DEBUG) { Debug("Request was $request  Reply was $reply"); }
                   6293:     }
1.212     foxr     6294:     $Transactions++;
                   6295: }
                   6296: 
                   6297: 
                   6298: #
                   6299: #    Sub to report a failure.
                   6300: #    This function:
                   6301: #     -   Increments the failure statistic counters.
                   6302: #     -   Invokes Reply to send the error message to the client.
                   6303: # Parameters:
                   6304: #    fd       - File descriptor open on the client
                   6305: #    reply    - Reply text to emit.
                   6306: #    request  - The original request message (used by Reply
                   6307: #               to debug if that's enabled.
                   6308: # Implicit outputs:
                   6309: #    $Failures- The number of failures is incremented.
                   6310: #    Reply (invoked here) sends a message to the 
                   6311: #    client:
                   6312: #
                   6313: sub Failure {
                   6314:     my $fd      = shift;
                   6315:     my $reply   = shift;
                   6316:     my $request = shift;
                   6317:    
                   6318:     $Failures++;
                   6319:     Reply($fd, $reply, $request);      # That's simple eh?
1.161     foxr     6320: }
1.57      www      6321: # ------------------------------------------------------------------ Log status
                   6322: 
                   6323: sub logstatus {
1.178     foxr     6324:     &status("Doing logging");
                   6325:     my $docdir=$perlvar{'lonDocRoot'};
                   6326:     {
                   6327: 	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
1.200     matthew  6328:         print $fh $status."\n".$lastlog."\n".time."\n$keymode";
1.178     foxr     6329:         $fh->close();
                   6330:     }
1.221     albertel 6331:     &status("Finished $$.txt");
                   6332:     {
                   6333: 	open(LOG,">>$docdir/lon-status/londstatus.txt");
                   6334: 	flock(LOG,LOCK_EX);
                   6335: 	print LOG $$."\t".$clientname."\t".$currenthostid."\t"
                   6336: 	    .$status."\t".$lastlog."\t $keymode\n";
1.275     albertel 6337: 	flock(LOG,LOCK_UN);
1.221     albertel 6338: 	close(LOG);
                   6339:     }
1.178     foxr     6340:     &status("Finished logging");
1.57      www      6341: }
                   6342: 
                   6343: sub initnewstatus {
                   6344:     my $docdir=$perlvar{'lonDocRoot'};
                   6345:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
1.460     foxr     6346:     my $now=time();
1.57      www      6347:     my $local=localtime($now);
                   6348:     print $fh "LOND status $local - parent $$\n\n";
1.64      www      6349:     opendir(DIR,"$docdir/lon-status/londchld");
1.134     albertel 6350:     while (my $filename=readdir(DIR)) {
1.64      www      6351:         unlink("$docdir/lon-status/londchld/$filename");
                   6352:     }
                   6353:     closedir(DIR);
1.57      www      6354: }
                   6355: 
                   6356: # -------------------------------------------------------------- Status setting
                   6357: 
                   6358: sub status {
                   6359:     my $what=shift;
                   6360:     my $now=time;
                   6361:     my $local=localtime($now);
1.178     foxr     6362:     $status=$local.': '.$what;
                   6363:     $0='lond: '.$what.' '.$local;
1.57      www      6364: }
1.11      www      6365: 
1.13      www      6366: # -------------------------------------------------------------- Talk to lonsql
                   6367: 
1.234     foxr     6368: sub sql_reply {
1.12      harris41 6369:     my ($cmd)=@_;
1.234     foxr     6370:     my $answer=&sub_sql_reply($cmd);
                   6371:     if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
1.12      harris41 6372:     return $answer;
                   6373: }
                   6374: 
1.234     foxr     6375: sub sub_sql_reply {
1.12      harris41 6376:     my ($cmd)=@_;
                   6377:     my $unixsock="mysqlsock";
                   6378:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
                   6379:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   6380:                                       Type    => SOCK_STREAM,
                   6381:                                       Timeout => 10)
                   6382:        or return "con_lost";
1.319     www      6383:     print $sclient "$cmd:$currentdomainid\n";
1.12      harris41 6384:     my $answer=<$sclient>;
                   6385:     chomp($answer);
                   6386:     if (!$answer) { $answer="con_lost"; }
                   6387:     return $answer;
                   6388: }
                   6389: 
1.1       albertel 6390: # --------------------------------------- Is this the home server of an author?
1.11      www      6391: 
1.1       albertel 6392: sub ishome {
                   6393:     my $author=shift;
                   6394:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                   6395:     my ($udom,$uname)=split(/\//,$author);
                   6396:     my $proname=propath($udom,$uname);
                   6397:     if (-e $proname) {
                   6398: 	return 'owner';
                   6399:     } else {
                   6400:         return 'not_owner';
                   6401:     }
                   6402: }
                   6403: 
                   6404: # ======================================================= Continue main program
                   6405: # ---------------------------------------------------- Fork once and dissociate
                   6406: 
1.134     albertel 6407: my $fpid=fork;
1.1       albertel 6408: exit if $fpid;
1.29      harris41 6409: die "Couldn't fork: $!" unless defined ($fpid);
1.1       albertel 6410: 
1.29      harris41 6411: POSIX::setsid() or die "Can't start new session: $!";
1.1       albertel 6412: 
                   6413: # ------------------------------------------------------- Write our PID on disk
                   6414: 
1.134     albertel 6415: my $execdir=$perlvar{'lonDaemons'};
1.1       albertel 6416: open (PIDSAVE,">$execdir/logs/lond.pid");
                   6417: print PIDSAVE "$$\n";
                   6418: close(PIDSAVE);
1.190     albertel 6419: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.57      www      6420: &status('Starting');
1.1       albertel 6421: 
1.106     foxr     6422: 
1.1       albertel 6423: 
                   6424: # ----------------------------------------------------- Install signal handlers
                   6425: 
1.57      www      6426: 
1.1       albertel 6427: $SIG{CHLD} = \&REAPER;
                   6428: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   6429: $SIG{HUP}  = \&HUPSMAN;
1.57      www      6430: $SIG{USR1} = \&checkchildren;
1.144     foxr     6431: $SIG{USR2} = \&UpdateHosts;
1.106     foxr     6432: 
1.148     foxr     6433: #  Read the host hashes:
1.368     albertel 6434: &Apache::lonnet::load_hosts_tab();
1.447     raeburn  6435: my %iphost = &Apache::lonnet::get_iphost(1);
1.106     foxr     6436: 
1.480     raeburn  6437: $dist=`$perlvar{'lonDaemons'}/distprobe`;
1.286     albertel 6438: 
1.471     raeburn  6439: my $arch = `uname -i`;
1.475     raeburn  6440: chomp($arch);
1.471     raeburn  6441: if ($arch eq 'unknown') {
                   6442:     $arch = `uname -m`;
1.475     raeburn  6443:     chomp($arch);
1.471     raeburn  6444: }
                   6445: 
1.106     foxr     6446: # --------------------------------------------------------------
                   6447: #   Accept connections.  When a connection comes in, it is validated
                   6448: #   and if good, a child process is created to process transactions
                   6449: #   along the connection.
                   6450: 
1.1       albertel 6451: while (1) {
1.165     albertel 6452:     &status('Starting accept');
1.106     foxr     6453:     $client = $server->accept() or next;
1.165     albertel 6454:     &status('Accepted '.$client.' off to spawn');
1.386     albertel 6455:     make_new_child($client);
1.165     albertel 6456:     &status('Finished spawning');
1.1       albertel 6457: }
                   6458: 
1.212     foxr     6459: sub make_new_child {
                   6460:     my $pid;
                   6461: #    my $cipher;     # Now global
                   6462:     my $sigset;
1.178     foxr     6463: 
1.212     foxr     6464:     $client = shift;
                   6465:     &status('Starting new child '.$client);
                   6466:     &logthis('<font color="green"> Attempting to start child ('.$client.
                   6467: 	     ")</font>");    
                   6468:     # block signal for fork
                   6469:     $sigset = POSIX::SigSet->new(SIGINT);
                   6470:     sigprocmask(SIG_BLOCK, $sigset)
                   6471:         or die "Can't block SIGINT for fork: $!\n";
1.178     foxr     6472: 
1.212     foxr     6473:     die "fork: $!" unless defined ($pid = fork);
1.178     foxr     6474: 
1.212     foxr     6475:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                   6476: 	                               # connection liveness.
1.178     foxr     6477: 
1.212     foxr     6478:     #
                   6479:     #  Figure out who we're talking to so we can record the peer in 
                   6480:     #  the pid hash.
                   6481:     #
                   6482:     my $caller = getpeername($client);
                   6483:     my ($port,$iaddr);
                   6484:     if (defined($caller) && length($caller) > 0) {
                   6485: 	($port,$iaddr)=unpack_sockaddr_in($caller);
                   6486:     } else {
                   6487: 	&logthis("Unable to determine who caller was, getpeername returned nothing");
                   6488:     }
                   6489:     if (defined($iaddr)) {
                   6490: 	$clientip  = inet_ntoa($iaddr);
                   6491: 	Debug("Connected with $clientip");
                   6492:     } else {
                   6493: 	&logthis("Unable to determine clientip");
                   6494: 	$clientip='Unavailable';
                   6495:     }
                   6496:     
                   6497:     if ($pid) {
                   6498:         # Parent records the child's birth and returns.
                   6499:         sigprocmask(SIG_UNBLOCK, $sigset)
                   6500:             or die "Can't unblock SIGINT for fork: $!\n";
                   6501:         $children{$pid} = $clientip;
                   6502:         &status('Started child '.$pid);
1.462     foxr     6503: 	close($client);
1.212     foxr     6504:         return;
                   6505:     } else {
                   6506:         # Child can *not* return from this subroutine.
                   6507:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
                   6508:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
                   6509:                                 #don't get intercepted
                   6510:         $SIG{USR1}= \&logstatus;
                   6511:         $SIG{ALRM}= \&timeout;
1.468     foxr     6512: 	#
                   6513: 	# Block sigpipe as it gets thrownon socket disconnect and we want to 
                   6514: 	# deal with that as a read faiure instead.
                   6515: 	#
                   6516: 	my $blockset = POSIX::SigSet->new(SIGPIPE);
                   6517: 	sigprocmask(SIG_BLOCK, $blockset);
                   6518: 
1.212     foxr     6519:         $lastlog='Forked ';
                   6520:         $status='Forked';
1.178     foxr     6521: 
1.212     foxr     6522:         # unblock signals
                   6523:         sigprocmask(SIG_UNBLOCK, $sigset)
                   6524:             or die "Can't unblock SIGINT for fork: $!\n";
1.178     foxr     6525: 
1.212     foxr     6526: #        my $tmpsnum=0;            # Now global
                   6527: #---------------------------------------------------- kerberos 5 initialization
                   6528:         &Authen::Krb5::init_context();
1.359     raeburn  6529: 	unless (($dist eq 'fedora5') || ($dist eq 'fedora4') ||  
                   6530: 		($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
1.286     albertel 6531: 	    &Authen::Krb5::init_ets();
                   6532: 	}
1.209     albertel 6533: 
1.212     foxr     6534: 	&status('Accepted connection');
                   6535: # =============================================================================
                   6536:             # do something with the connection
                   6537: # -----------------------------------------------------------------------------
                   6538: 	# see if we know client and 'check' for spoof IP by ineffective challenge
1.178     foxr     6539: 
1.278     albertel 6540: 	my $outsideip=$clientip;
                   6541: 	if ($clientip eq '127.0.0.1') {
1.368     albertel 6542: 	    $outsideip=&Apache::lonnet::get_host_ip($perlvar{'lonHostID'});
1.278     albertel 6543: 	}
1.412     foxr     6544: 	&ReadManagerTable();
1.368     albertel 6545: 	my $clientrec=defined(&Apache::lonnet::get_hosts_from_ip($outsideip));
1.278     albertel 6546: 	my $ismanager=($managers{$outsideip}    ne undef);
1.432     raeburn  6547: 	$clientname  = "[unknown]";
1.212     foxr     6548: 	if($clientrec) {	# Establish client type.
                   6549: 	    $ConnectionType = "client";
1.368     albertel 6550: 	    $clientname = (&Apache::lonnet::get_hosts_from_ip($outsideip))[-1];
1.212     foxr     6551: 	    if($ismanager) {
                   6552: 		$ConnectionType = "both";
                   6553: 	    }
                   6554: 	} else {
                   6555: 	    $ConnectionType = "manager";
1.278     albertel 6556: 	    $clientname = $managers{$outsideip};
1.212     foxr     6557: 	}
                   6558: 	my $clientok;
1.178     foxr     6559: 
1.212     foxr     6560: 	if ($clientrec || $ismanager) {
                   6561: 	    &status("Waiting for init from $clientip $clientname");
                   6562: 	    &logthis('<font color="yellow">INFO: Connection, '.
                   6563: 		     $clientip.
                   6564: 		  " ($clientname) connection type = $ConnectionType </font>" );
                   6565: 	    &status("Connecting $clientip  ($clientname))"); 
                   6566: 	    my $remotereq=<$client>;
                   6567: 	    chomp($remotereq);
                   6568: 	    Debug("Got init: $remotereq");
1.337     albertel 6569: 
1.212     foxr     6570: 	    if ($remotereq =~ /^init/) {
                   6571: 		&sethost("sethost:$perlvar{'lonHostID'}");
                   6572: 		#
                   6573: 		#  If the remote is attempting a local init... give that a try:
                   6574: 		#
1.432     raeburn  6575: 		(my $i, my $inittype, $clientversion) = split(/:/, $remotereq);
1.209     albertel 6576: 
1.212     foxr     6577: 		# If the connection type is ssl, but I didn't get my
                   6578: 		# certificate files yet, then I'll drop  back to 
                   6579: 		# insecure (if allowed).
                   6580: 		
                   6581: 		if($inittype eq "ssl") {
                   6582: 		    my ($ca, $cert) = lonssl::CertificateFile;
                   6583: 		    my $kfile       = lonssl::KeyFile;
                   6584: 		    if((!$ca)   || 
                   6585: 		       (!$cert) || 
                   6586: 		       (!$kfile)) {
                   6587: 			$inittype = ""; # This forces insecure attempt.
                   6588: 			&logthis("<font color=\"blue\"> Certificates not "
                   6589: 				 ."installed -- trying insecure auth</font>");
1.224     foxr     6590: 		    } else {	# SSL certificates are in place so
1.212     foxr     6591: 		    }		# Leave the inittype alone.
                   6592: 		}
                   6593: 
                   6594: 		if($inittype eq "local") {
1.432     raeburn  6595:                     $clientversion = $perlvar{'lonVersion'};
1.212     foxr     6596: 		    my $key = LocalConnection($client, $remotereq);
                   6597: 		    if($key) {
                   6598: 			Debug("Got local key $key");
                   6599: 			$clientok     = 1;
                   6600: 			my $cipherkey = pack("H32", $key);
                   6601: 			$cipher       = new IDEA($cipherkey);
                   6602: 			print $client "ok:local\n";
1.442     www      6603: 			&logthis('<font color="green">'
1.212     foxr     6604: 				 . "Successful local authentication </font>");
                   6605: 			$keymode = "local"
1.178     foxr     6606: 		    } else {
1.212     foxr     6607: 			Debug("Failed to get local key");
                   6608: 			$clientok = 0;
                   6609: 			shutdown($client, 3);
                   6610: 			close $client;
1.178     foxr     6611: 		    }
1.212     foxr     6612: 		} elsif ($inittype eq "ssl") {
                   6613: 		    my $key = SSLConnection($client);
                   6614: 		    if ($key) {
                   6615: 			$clientok = 1;
                   6616: 			my $cipherkey = pack("H32", $key);
                   6617: 			$cipher       = new IDEA($cipherkey);
                   6618: 			&logthis('<font color="green">'
                   6619: 				 ."Successfull ssl authentication with $clientname </font>");
                   6620: 			$keymode = "ssl";
                   6621: 	     
1.178     foxr     6622: 		    } else {
1.212     foxr     6623: 			$clientok = 0;
                   6624: 			close $client;
1.178     foxr     6625: 		    }
1.212     foxr     6626: 	   
                   6627: 		} else {
                   6628: 		    my $ok = InsecureConnection($client);
                   6629: 		    if($ok) {
                   6630: 			$clientok = 1;
                   6631: 			&logthis('<font color="green">'
                   6632: 				 ."Successful insecure authentication with $clientname </font>");
                   6633: 			print $client "ok\n";
                   6634: 			$keymode = "insecure";
1.178     foxr     6635: 		    } else {
1.212     foxr     6636: 			&logthis('<font color="yellow">'
                   6637: 				  ."Attempted insecure connection disallowed </font>");
                   6638: 			close $client;
                   6639: 			$clientok = 0;
1.178     foxr     6640: 			
                   6641: 		    }
                   6642: 		}
1.212     foxr     6643: 	    } else {
                   6644: 		&logthis(
                   6645: 			 "<font color='blue'>WARNING: "
                   6646: 			 ."$clientip failed to initialize: >$remotereq< </font>");
                   6647: 		&status('No init '.$clientip);
                   6648: 	    }
                   6649: 	    
                   6650: 	} else {
                   6651: 	    &logthis(
                   6652: 		     "<font color='blue'>WARNING: Unknown client $clientip</font>");
                   6653: 	    &status('Hung up on '.$clientip);
                   6654: 	}
                   6655:  
                   6656: 	if ($clientok) {
                   6657: # ---------------- New known client connecting, could mean machine online again
1.368     albertel 6658: 	    if (&Apache::lonnet::get_host_ip($currenthostid) ne $clientip 
1.367     albertel 6659: 		&& $clientip ne '127.0.0.1') {
1.375     albertel 6660: 		&Apache::lonnet::reconlonc($clientname);
1.212     foxr     6661: 	    }
                   6662: 	    &logthis("<font color='green'>Established connection: $clientname</font>");
                   6663: 	    &status('Will listen to '.$clientname);
                   6664: # ------------------------------------------------------------ Process requests
                   6665: 	    my $keep_going = 1;
                   6666: 	    my $user_input;
1.448     raeburn  6667:             my $clienthost = &Apache::lonnet::hostname($clientname);
                   6668:             my $clientserverhomeID = &Apache::lonnet::get_server_homeID($clienthost);
                   6669:             $clienthomedom = &Apache::lonnet::host_domain($clientserverhomeID);
1.212     foxr     6670: 	    while(($user_input = get_request) && $keep_going) {
                   6671: 		alarm(120);
                   6672: 		Debug("Main: Got $user_input\n");
                   6673: 		$keep_going = &process_request($user_input);
1.178     foxr     6674: 		alarm(0);
1.212     foxr     6675: 		&status('Listening to '.$clientname." ($keymode)");	   
1.161     foxr     6676: 	    }
1.212     foxr     6677: 
1.59      www      6678: # --------------------------------------------- client unknown or fishy, refuse
1.212     foxr     6679: 	}  else {
1.161     foxr     6680: 	    print $client "refused\n";
                   6681: 	    $client->close();
1.190     albertel 6682: 	    &logthis("<font color='blue'>WARNING: "
1.161     foxr     6683: 		     ."Rejected client $clientip, closing connection</font>");
                   6684: 	}
1.212     foxr     6685:     }            
1.161     foxr     6686:     
1.1       albertel 6687: # =============================================================================
1.161     foxr     6688:     
1.190     albertel 6689:     &logthis("<font color='red'>CRITICAL: "
1.161     foxr     6690: 	     ."Disconnect from $clientip ($clientname)</font>");    
                   6691:     
                   6692:     
                   6693:     # this exit is VERY important, otherwise the child will become
                   6694:     # a producer of more and more children, forking yourself into
                   6695:     # process death.
                   6696:     exit;
1.106     foxr     6697:     
1.78      foxr     6698: }
1.261     foxr     6699: #
                   6700: #   Determine if a user is an author for the indicated domain.
                   6701: #
                   6702: # Parameters:
                   6703: #    domain          - domain to check in .
                   6704: #    user            - Name of user to check.
                   6705: #
                   6706: # Return:
                   6707: #     1             - User is an author for domain.
                   6708: #     0             - User is not an author for domain.
                   6709: sub is_author {
                   6710:     my ($domain, $user) = @_;
                   6711: 
                   6712:     &Debug("is_author: $user @ $domain");
                   6713: 
                   6714:     my $hashref = &tie_user_hash($domain, $user, "roles",
                   6715: 				 &GDBM_READER());
                   6716: 
                   6717:     #  Author role should show up as a key /domain/_au
1.78      foxr     6718: 
1.321     albertel 6719:     my $key    = "/$domain/_au";
                   6720:     my $value;
                   6721:     if (defined($hashref)) {
                   6722: 	$value = $hashref->{$key};
                   6723:     }
1.78      foxr     6724: 
1.261     foxr     6725:     if(defined($value)) {
                   6726: 	&Debug("$user @ $domain is an author");
                   6727:     }
                   6728: 
                   6729:     return defined($value);
                   6730: }
1.78      foxr     6731: #
                   6732: #   Checks to see if the input roleput request was to set
1.482     www      6733: # an author role.  If so, creates construction space 
1.78      foxr     6734: # Parameters:
                   6735: #    request   - The request sent to the rolesput subchunk.
                   6736: #                We're looking for  /domain/_au
                   6737: #    domain    - The domain in which the user is having roles doctored.
                   6738: #    user      - Name of the user for which the role is being put.
                   6739: #    authtype  - The authentication type associated with the user.
                   6740: #
1.289     albertel 6741: sub manage_permissions {
1.192     foxr     6742:     my ($request, $domain, $user, $authtype) = @_;
1.78      foxr     6743:     # See if the request is of the form /$domain/_au
1.289     albertel 6744:     if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
1.482     www      6745:         my $path="/home/httpd/html/priv/".$domain;
                   6746:         unless (-e $path) {        
                   6747:            mkdir($path);
                   6748:         }
                   6749:         unless (-e $path.'/'.$user) {
                   6750:            mkdir($path.'/'.$user);
                   6751:         }
1.78      foxr     6752:     }
                   6753: }
1.222     foxr     6754: 
                   6755: 
                   6756: #
                   6757: #  Return the full path of a user password file, whether it exists or not.
                   6758: # Parameters:
                   6759: #   domain     - Domain in which the password file lives.
                   6760: #   user       - name of the user.
                   6761: # Returns:
                   6762: #    Full passwd path:
                   6763: #
                   6764: sub password_path {
                   6765:     my ($domain, $user) = @_;
1.264     albertel 6766:     return &propath($domain, $user).'/passwd';
1.222     foxr     6767: }
                   6768: 
                   6769: #   Password Filename
                   6770: #   Returns the path to a passwd file given domain and user... only if
                   6771: #  it exists.
                   6772: # Parameters:
                   6773: #   domain    - Domain in which to search.
                   6774: #   user      - username.
                   6775: # Returns:
                   6776: #   - If the password file exists returns its path.
                   6777: #   - If the password file does not exist, returns undefined.
                   6778: #
                   6779: sub password_filename {
                   6780:     my ($domain, $user) = @_;
                   6781: 
                   6782:     Debug ("PasswordFilename called: dom = $domain user = $user");
                   6783: 
                   6784:     my $path  = &password_path($domain, $user);
                   6785:     Debug("PasswordFilename got path: $path");
                   6786:     if(-e $path) {
                   6787: 	return $path;
                   6788:     } else {
                   6789: 	return undef;
                   6790:     }
                   6791: }
                   6792: 
                   6793: #
                   6794: #   Rewrite the contents of the user's passwd file.
                   6795: #  Parameters:
                   6796: #    domain    - domain of the user.
                   6797: #    name      - User's name.
                   6798: #    contents  - New contents of the file.
                   6799: # Returns:
                   6800: #   0    - Failed.
                   6801: #   1    - Success.
                   6802: #
                   6803: sub rewrite_password_file {
                   6804:     my ($domain, $user, $contents) = @_;
                   6805: 
                   6806:     my $file = &password_filename($domain, $user);
                   6807:     if (defined $file) {
                   6808: 	my $pf = IO::File->new(">$file");
                   6809: 	if($pf) {
                   6810: 	    print $pf "$contents\n";
                   6811: 	    return 1;
                   6812: 	} else {
                   6813: 	    return 0;
                   6814: 	}
                   6815:     } else {
                   6816: 	return 0;
                   6817:     }
                   6818: 
                   6819: }
                   6820: 
1.78      foxr     6821: #
1.222     foxr     6822: #   get_auth_type - Determines the authorization type of a user in a domain.
1.78      foxr     6823: 
                   6824: #     Returns the authorization type or nouser if there is no such user.
                   6825: #
1.436     raeburn  6826: sub get_auth_type {
1.192     foxr     6827:     my ($domain, $user)  = @_;
1.78      foxr     6828: 
1.222     foxr     6829:     Debug("get_auth_type( $domain, $user ) \n");
1.78      foxr     6830:     my $proname    = &propath($domain, $user); 
                   6831:     my $passwdfile = "$proname/passwd";
                   6832:     if( -e $passwdfile ) {
                   6833: 	my $pf = IO::File->new($passwdfile);
                   6834: 	my $realpassword = <$pf>;
                   6835: 	chomp($realpassword);
1.79      foxr     6836: 	Debug("Password info = $realpassword\n");
1.78      foxr     6837: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79      foxr     6838: 	Debug("Authtype = $authtype, content = $contentpwd\n");
1.259     raeburn  6839: 	return "$authtype:$contentpwd";     
1.224     foxr     6840:     } else {
1.79      foxr     6841: 	Debug("Returning nouser");
1.78      foxr     6842: 	return "nouser";
                   6843:     }
1.1       albertel 6844: }
                   6845: 
1.220     foxr     6846: #
                   6847: #  Validate a user given their domain, name and password.  This utility
                   6848: #  function is used by both  AuthenticateHandler and ChangePasswordHandler
                   6849: #  to validate the login credentials of a user.
                   6850: # Parameters:
                   6851: #    $domain    - The domain being logged into (this is required due to
                   6852: #                 the capability for multihomed systems.
                   6853: #    $user      - The name of the user being validated.
                   6854: #    $password  - The user's propoposed password.
                   6855: #
                   6856: # Returns:
                   6857: #     1        - The domain,user,pasword triplet corresponds to a valid
                   6858: #                user.
                   6859: #     0        - The domain,user,password triplet is not a valid user.
                   6860: #
                   6861: sub validate_user {
1.396     raeburn  6862:     my ($domain, $user, $password, $checkdefauth) = @_;
1.220     foxr     6863: 
                   6864:     # Why negative ~pi you may well ask?  Well this function is about
                   6865:     # authentication, and therefore very important to get right.
                   6866:     # I've initialized the flag that determines whether or not I've 
                   6867:     # validated correctly to a value it's not supposed to get.
                   6868:     # At the end of this function. I'll ensure that it's not still that
                   6869:     # value so we don't just wind up returning some accidental value
                   6870:     # as a result of executing an unforseen code path that
1.249     foxr     6871:     # did not set $validated.  At the end of valid execution paths,
                   6872:     # validated shoule be 1 for success or 0 for failuer.
1.220     foxr     6873: 
                   6874:     my $validated = -3.14159;
                   6875: 
                   6876:     #  How we authenticate is determined by the type of authentication
                   6877:     #  the user has been assigned.  If the authentication type is
                   6878:     #  "nouser", the user does not exist so we will return 0.
                   6879: 
1.222     foxr     6880:     my $contents = &get_auth_type($domain, $user);
1.220     foxr     6881:     my ($howpwd, $contentpwd) = split(/:/, $contents);
                   6882: 
                   6883:     my $null = pack("C",0);	# Used by kerberos auth types.
                   6884: 
1.395     raeburn  6885:     if ($howpwd eq 'nouser') {
1.396     raeburn  6886:         if ($checkdefauth) {
                   6887:             my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
                   6888:             if ($domdefaults{'auth_def'} eq 'localauth') {
                   6889:                 $howpwd = $domdefaults{'auth_def'};
                   6890:                 $contentpwd = $domdefaults{'auth_arg_def'};
                   6891:             } elsif ((($domdefaults{'auth_def'} eq 'krb4') || 
                   6892:                       ($domdefaults{'auth_def'} eq 'krb5')) &&
                   6893:                      ($domdefaults{'auth_arg_def'} ne '')) {
                   6894:                 $howpwd = $domdefaults{'auth_def'};
                   6895:                 $contentpwd = $domdefaults{'auth_arg_def'}; 
                   6896:             }
1.395     raeburn  6897:         }
                   6898:     } 
1.220     foxr     6899:     if ($howpwd ne 'nouser') {
                   6900: 	if($howpwd eq "internal") { # Encrypted is in local password file.
                   6901: 	    $validated = (crypt($password, $contentpwd) eq $contentpwd);
                   6902: 	}
                   6903: 	elsif ($howpwd eq "unix") { # User is a normal unix user.
                   6904: 	    $contentpwd = (getpwnam($user))[1];
                   6905: 	    if($contentpwd) {
                   6906: 		if($contentpwd eq 'x') { # Shadow password file...
                   6907: 		    my $pwauth_path = "/usr/local/sbin/pwauth";
                   6908: 		    open PWAUTH,  "|$pwauth_path" or
                   6909: 			die "Cannot invoke authentication";
                   6910: 		    print PWAUTH "$user\n$password\n";
                   6911: 		    close PWAUTH;
                   6912: 		    $validated = ! $?;
                   6913: 
                   6914: 		} else { 	         # Passwords in /etc/passwd. 
                   6915: 		    $validated = (crypt($password,
                   6916: 					$contentpwd) eq $contentpwd);
                   6917: 		}
                   6918: 	    } else {
                   6919: 		$validated = 0;
                   6920: 	    }
1.439     raeburn  6921: 	} elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
                   6922:             my $checkwithkrb5 = 0;
                   6923:             if ($dist =~/^fedora(\d+)$/) {
                   6924:                 if ($1 > 11) {
                   6925:                     $checkwithkrb5 = 1;
                   6926:                 }
                   6927:             } elsif ($dist =~ /^suse([\d.]+)$/) {
                   6928:                 if ($1 > 11.1) {
                   6929:                     $checkwithkrb5 = 1; 
                   6930:                 }
                   6931:             }
                   6932:             if ($checkwithkrb5) {
                   6933:                 $validated = &krb5_authen($password,$null,$user,$contentpwd);
                   6934:             } else {
                   6935:                 $validated = &krb4_authen($password,$null,$user,$contentpwd);
                   6936:             }
1.224     foxr     6937: 	} elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
1.439     raeburn  6938:             $validated = &krb5_authen($password,$null,$user,$contentpwd);
1.224     foxr     6939: 	} elsif ($howpwd eq "localauth") { 
1.220     foxr     6940: 	    #  Authenticate via installation specific authentcation method:
                   6941: 	    $validated = &localauth::localauth($user, 
                   6942: 					       $password, 
1.353     albertel 6943: 					       $contentpwd,
                   6944: 					       $domain);
1.358     albertel 6945: 	    if ($validated < 0) {
1.357     albertel 6946: 		&logthis("localauth for $contentpwd $user:$domain returned a $validated");
                   6947: 		$validated = 0;
                   6948: 	    }
1.224     foxr     6949: 	} else {			# Unrecognized auth is also bad.
1.220     foxr     6950: 	    $validated = 0;
                   6951: 	}
                   6952:     } else {
                   6953: 	$validated = 0;
                   6954:     }
                   6955:     #
                   6956:     #  $validated has the correct stat of the authentication:
                   6957:     #
                   6958: 
                   6959:     unless ($validated != -3.14159) {
1.249     foxr     6960: 	#  I >really really< want to know if this happens.
                   6961: 	#  since it indicates that user authentication is badly
                   6962: 	#  broken in some code path.
                   6963:         #
                   6964: 	die "ValidateUser - failed to set the value of validated $domain, $user $password";
1.220     foxr     6965:     }
                   6966:     return $validated;
                   6967: }
                   6968: 
1.439     raeburn  6969: sub krb4_authen {
                   6970:     my ($password,$null,$user,$contentpwd) = @_;
                   6971:     my $validated = 0;
                   6972:     if (!($password =~ /$null/) ) {  # Null password not allowed.
                   6973:         eval {
                   6974:             require Authen::Krb4;
                   6975:         };
                   6976:         if (!$@) {
                   6977:             my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
                   6978:                                                        "",
                   6979:                                                        $contentpwd,,
                   6980:                                                        'krbtgt',
                   6981:                                                        $contentpwd,
                   6982:                                                        1,
                   6983:                                                        $password);
                   6984:             if(!$k4error) {
                   6985:                 $validated = 1;
                   6986:             } else {
                   6987:                 $validated = 0;
                   6988:                 &logthis('krb4: '.$user.', '.$contentpwd.', '.
                   6989:                           &Authen::Krb4::get_err_txt($Authen::Krb4::error));
                   6990:             }
                   6991:         } else {
                   6992:             $validated = krb5_authen($password,$null,$user,$contentpwd);
                   6993:         }
                   6994:     }
                   6995:     return $validated;
                   6996: }
                   6997: 
                   6998: sub krb5_authen {
                   6999:     my ($password,$null,$user,$contentpwd) = @_;
                   7000:     my $validated = 0;
                   7001:     if(!($password =~ /$null/)) { # Null password not allowed.
                   7002:         my $krbclient = &Authen::Krb5::parse_name($user.'@'
                   7003:                                                   .$contentpwd);
                   7004:         my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
                   7005:         my $krbserver  = &Authen::Krb5::parse_name($krbservice);
                   7006:         my $credentials= &Authen::Krb5::cc_default();
                   7007:         $credentials->initialize(&Authen::Krb5::parse_name($user.'@'
                   7008:                                                             .$contentpwd));
                   7009:         my $krbreturn;
                   7010:         if (exists(&Authen::Krb5::get_init_creds_password)) {
                   7011:             $krbreturn =
                   7012:                 &Authen::Krb5::get_init_creds_password($krbclient,$password,
                   7013:                                                           $krbservice);
                   7014:             $validated = (ref($krbreturn) eq 'Authen::Krb5::Creds');
                   7015:         } else {
                   7016:             $krbreturn  =
                   7017:                 &Authen::Krb5::get_in_tkt_with_password($krbclient,$krbserver,
                   7018:                                                          $password,$credentials);
                   7019:             $validated = ($krbreturn == 1);
                   7020:         }
                   7021:         if (!$validated) {
                   7022:             &logthis('krb5: '.$user.', '.$contentpwd.', '.
                   7023:                      &Authen::Krb5::error());
                   7024:         }
                   7025:     }
                   7026:     return $validated;
                   7027: }
1.220     foxr     7028: 
1.84      albertel 7029: sub addline {
                   7030:     my ($fname,$hostid,$ip,$newline)=@_;
                   7031:     my $contents;
                   7032:     my $found=0;
1.355     albertel 7033:     my $expr='^'.quotemeta($hostid).':'.quotemeta($ip).':';
1.134     albertel 7034:     my $sh;
1.84      albertel 7035:     if ($sh=IO::File->new("$fname.subscription")) {
                   7036: 	while (my $subline=<$sh>) {
                   7037: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
                   7038: 	}
                   7039: 	$sh->close();
                   7040:     }
                   7041:     $sh=IO::File->new(">$fname.subscription");
                   7042:     if ($contents) { print $sh $contents; }
                   7043:     if ($newline) { print $sh $newline; }
                   7044:     $sh->close();
                   7045:     return $found;
1.86      www      7046: }
                   7047: 
1.234     foxr     7048: sub get_chat {
1.324     raeburn  7049:     my ($cdom,$cname,$udom,$uname,$group)=@_;
1.310     albertel 7050: 
1.87      www      7051:     my @entries=();
1.324     raeburn  7052:     my $namespace = 'nohist_chatroom';
                   7053:     my $namespace_inroom = 'nohist_inchatroom';
1.335     albertel 7054:     if ($group ne '') {
1.324     raeburn  7055:         $namespace .= '_'.$group;
                   7056:         $namespace_inroom .= '_'.$group;
                   7057:     }
                   7058:     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
1.310     albertel 7059: 				 &GDBM_READER());
                   7060:     if ($hashref) {
                   7061: 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
1.311     albertel 7062: 	&untie_user_hash($hashref);
1.123     www      7063:     }
1.124     www      7064:     my @participants=();
1.134     albertel 7065:     my $cutoff=time-60;
1.324     raeburn  7066:     $hashref = &tie_user_hash($cdom, $cname, $namespace_inroom,
1.310     albertel 7067: 			      &GDBM_WRCREAT());
                   7068:     if ($hashref) {
                   7069:         $hashref->{$uname.':'.$udom}=time;
                   7070:         foreach my $user (sort(keys(%$hashref))) {
                   7071: 	    if ($hashref->{$user}>$cutoff) {
                   7072: 		push(@participants, 'active_participant:'.$user);
1.123     www      7073:             }
                   7074:         }
1.311     albertel 7075:         &untie_user_hash($hashref);
1.86      www      7076:     }
1.124     www      7077:     return (@participants,@entries);
1.86      www      7078: }
                   7079: 
1.234     foxr     7080: sub chat_add {
1.324     raeburn  7081:     my ($cdom,$cname,$newchat,$group)=@_;
1.88      albertel 7082:     my @entries=();
1.142     www      7083:     my $time=time;
1.324     raeburn  7084:     my $namespace = 'nohist_chatroom';
                   7085:     my $logfile = 'chatroom.log';
1.335     albertel 7086:     if ($group ne '') {
1.324     raeburn  7087:         $namespace .= '_'.$group;
                   7088:         $logfile = 'chatroom_'.$group.'.log';
                   7089:     }
                   7090:     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
1.310     albertel 7091: 				 &GDBM_WRCREAT());
                   7092:     if ($hashref) {
                   7093: 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
1.88      albertel 7094: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
                   7095: 	my ($thentime,$idnum)=split(/\_/,$lastid);
                   7096: 	my $newid=$time.'_000000';
                   7097: 	if ($thentime==$time) {
                   7098: 	    $idnum=~s/^0+//;
                   7099: 	    $idnum++;
                   7100: 	    $idnum=substr('000000'.$idnum,-6,6);
                   7101: 	    $newid=$time.'_'.$idnum;
                   7102: 	}
1.310     albertel 7103: 	$hashref->{$newid}=$newchat;
1.88      albertel 7104: 	my $expired=$time-3600;
1.310     albertel 7105: 	foreach my $comment (keys(%$hashref)) {
                   7106: 	    my ($thistime) = ($comment=~/(\d+)\_/);
1.88      albertel 7107: 	    if ($thistime<$expired) {
1.310     albertel 7108: 		delete $hashref->{$comment};
1.88      albertel 7109: 	    }
                   7110: 	}
1.310     albertel 7111: 	{
                   7112: 	    my $proname=&propath($cdom,$cname);
1.324     raeburn  7113: 	    if (open(CHATLOG,">>$proname/$logfile")) { 
1.310     albertel 7114: 		print CHATLOG ("$time:".&unescape($newchat)."\n");
                   7115: 	    }
                   7116: 	    close(CHATLOG);
1.142     www      7117: 	}
1.311     albertel 7118: 	&untie_user_hash($hashref);
1.86      www      7119:     }
1.84      albertel 7120: }
                   7121: 
                   7122: sub unsub {
                   7123:     my ($fname,$clientip)=@_;
                   7124:     my $result;
1.188     foxr     7125:     my $unsubs = 0;		# Number of successful unsubscribes:
                   7126: 
                   7127: 
                   7128:     # An old way subscriptions were handled was to have a 
                   7129:     # subscription marker file:
                   7130: 
                   7131:     Debug("Attempting unlink of $fname.$clientname");
1.161     foxr     7132:     if (unlink("$fname.$clientname")) {
1.188     foxr     7133: 	$unsubs++;		# Successful unsub via marker file.
                   7134:     } 
                   7135: 
                   7136:     # The more modern way to do it is to have a subscription list
                   7137:     # file:
                   7138: 
1.84      albertel 7139:     if (-e "$fname.subscription") {
1.161     foxr     7140: 	my $found=&addline($fname,$clientname,$clientip,'');
1.188     foxr     7141: 	if ($found) { 
                   7142: 	    $unsubs++;
                   7143: 	}
                   7144:     } 
                   7145: 
                   7146:     #  If either or both of these mechanisms succeeded in unsubscribing a 
                   7147:     #  resource we can return ok:
                   7148: 
                   7149:     if($unsubs) {
                   7150: 	$result = "ok\n";
1.84      albertel 7151:     } else {
1.188     foxr     7152: 	$result = "not_subscribed\n";
1.84      albertel 7153:     }
1.188     foxr     7154: 
1.84      albertel 7155:     return $result;
                   7156: }
                   7157: 
1.101     www      7158: sub currentversion {
                   7159:     my $fname=shift;
                   7160:     my $version=-1;
                   7161:     my $ulsdir='';
                   7162:     if ($fname=~/^(.+)\/[^\/]+$/) {
                   7163:        $ulsdir=$1;
                   7164:     }
1.114     albertel 7165:     my ($fnamere1,$fnamere2);
                   7166:     # remove version if already specified
1.101     www      7167:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114     albertel 7168:     # get the bits that go before and after the version number
                   7169:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
                   7170: 	$fnamere1=$1;
                   7171: 	$fnamere2='.'.$2;
                   7172:     }
1.101     www      7173:     if (-e $fname) { $version=1; }
                   7174:     if (-e $ulsdir) {
1.134     albertel 7175: 	if(-d $ulsdir) {
                   7176: 	    if (opendir(LSDIR,$ulsdir)) {
                   7177: 		my $ulsfn;
                   7178: 		while ($ulsfn=readdir(LSDIR)) {
1.101     www      7179: # see if this is a regular file (ignore links produced earlier)
1.134     albertel 7180: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
                   7181: 		    unless (-l $thisfile) {
1.160     www      7182: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134     albertel 7183: 			    if ($1>$version) { $version=$1; }
                   7184: 			}
                   7185: 		    }
                   7186: 		}
                   7187: 		closedir(LSDIR);
                   7188: 		$version++;
                   7189: 	    }
                   7190: 	}
                   7191:     }
                   7192:     return $version;
1.101     www      7193: }
                   7194: 
                   7195: sub thisversion {
                   7196:     my $fname=shift;
                   7197:     my $version=-1;
                   7198:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
                   7199: 	$version=$1;
                   7200:     }
                   7201:     return $version;
                   7202: }
                   7203: 
1.84      albertel 7204: sub subscribe {
                   7205:     my ($userinput,$clientip)=@_;
                   7206:     my $result;
1.293     albertel 7207:     my ($cmd,$fname)=split(/:/,$userinput,2);
1.84      albertel 7208:     my $ownership=&ishome($fname);
                   7209:     if ($ownership eq 'owner') {
1.101     www      7210: # explitly asking for the current version?
                   7211:         unless (-e $fname) {
                   7212:             my $currentversion=&currentversion($fname);
                   7213: 	    if (&thisversion($fname)==$currentversion) {
                   7214:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
                   7215: 		    my $root=$1;
                   7216:                     my $extension=$2;
                   7217:                     symlink($root.'.'.$extension,
                   7218:                             $root.'.'.$currentversion.'.'.$extension);
1.102     www      7219:                     unless ($extension=~/\.meta$/) {
                   7220:                        symlink($root.'.'.$extension.'.meta',
                   7221:                             $root.'.'.$currentversion.'.'.$extension.'.meta');
                   7222: 		    }
1.101     www      7223:                 }
                   7224:             }
                   7225:         }
1.84      albertel 7226: 	if (-e $fname) {
                   7227: 	    if (-d $fname) {
                   7228: 		$result="directory\n";
                   7229: 	    } else {
1.161     foxr     7230: 		if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134     albertel 7231: 		my $now=time;
1.161     foxr     7232: 		my $found=&addline($fname,$clientname,$clientip,
                   7233: 				   "$clientname:$clientip:$now\n");
1.84      albertel 7234: 		if ($found) { $result="$fname\n"; }
                   7235: 		# if they were subscribed to only meta data, delete that
                   7236:                 # subscription, when you subscribe to a file you also get
                   7237:                 # the metadata
                   7238: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
                   7239: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
1.476     raeburn  7240:                 my $protocol = $Apache::lonnet::protocol{$perlvar{'lonHostID'}};
                   7241:                 $protocol = 'http' if ($protocol ne 'https');
                   7242: 		$fname=$protocol.'://'.&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
1.84      albertel 7243: 		$result="$fname\n";
                   7244: 	    }
                   7245: 	} else {
                   7246: 	    $result="not_found\n";
                   7247: 	}
                   7248:     } else {
                   7249: 	$result="rejected\n";
                   7250:     }
                   7251:     return $result;
                   7252: }
1.287     foxr     7253: #  Change the passwd of a unix user.  The caller must have
                   7254: #  first verified that the user is a loncapa user.
                   7255: #
                   7256: # Parameters:
                   7257: #    user      - Unix user name to change.
                   7258: #    pass      - New password for the user.
                   7259: # Returns:
                   7260: #    ok    - if success
                   7261: #    other - Some meaningfule error message string.
                   7262: # NOTE:
                   7263: #    invokes a setuid script to change the passwd.
                   7264: sub change_unix_password {
                   7265:     my ($user, $pass) = @_;
                   7266: 
                   7267:     &Debug("change_unix_password");
                   7268:     my $execdir=$perlvar{'lonDaemons'};
                   7269:     &Debug("Opening lcpasswd pipeline");
                   7270:     my $pf = IO::File->new("|$execdir/lcpasswd > "
                   7271: 			   ."$perlvar{'lonDaemons'}"
                   7272: 			   ."/logs/lcpasswd.log");
                   7273:     print $pf "$user\n$pass\n$pass\n";
                   7274:     close $pf;
                   7275:     my $err = $?;
                   7276:     return ($err < @passwderrors) ? $passwderrors[$err] : 
                   7277: 	"pwchange_falure - unknown error";
                   7278: 
                   7279:     
                   7280: }
                   7281: 
1.91      albertel 7282: 
                   7283: sub make_passwd_file {
1.483   ! www      7284:     my ($uname,$udom,$umode,$npass,$passfilename)=@_;
1.390     raeburn  7285:     my $result="ok";
1.91      albertel 7286:     if ($umode eq 'krb4' or $umode eq 'krb5') {
                   7287: 	{
                   7288: 	    my $pf = IO::File->new(">$passfilename");
1.261     foxr     7289: 	    if ($pf) {
                   7290: 		print $pf "$umode:$npass\n";
                   7291: 	    } else {
                   7292: 		$result = "pass_file_failed_error";
                   7293: 	    }
1.91      albertel 7294: 	}
                   7295:     } elsif ($umode eq 'internal') {
                   7296: 	my $salt=time;
                   7297: 	$salt=substr($salt,6,2);
                   7298: 	my $ncpass=crypt($npass,$salt);
                   7299: 	{
                   7300: 	    &Debug("Creating internal auth");
                   7301: 	    my $pf = IO::File->new(">$passfilename");
1.261     foxr     7302: 	    if($pf) {
                   7303: 		print $pf "internal:$ncpass\n"; 
                   7304: 	    } else {
                   7305: 		$result = "pass_file_failed_error";
                   7306: 	    }
1.91      albertel 7307: 	}
                   7308:     } elsif ($umode eq 'localauth') {
                   7309: 	{
                   7310: 	    my $pf = IO::File->new(">$passfilename");
1.261     foxr     7311: 	    if($pf) {
                   7312: 		print $pf "localauth:$npass\n";
                   7313: 	    } else {
                   7314: 		$result = "pass_file_failed_error";
                   7315: 	    }
1.91      albertel 7316: 	}
                   7317:     } elsif ($umode eq 'unix') {
                   7318: 	{
1.186     foxr     7319: 	    #
                   7320: 	    #  Don't allow the creation of privileged accounts!!! that would
                   7321: 	    #  be real bad!!!
                   7322: 	    #
                   7323: 	    my $uid = getpwnam($uname);
                   7324: 	    if((defined $uid) && ($uid == 0)) {
1.483   ! www      7325: 		&logthis(">>>Attempt to create privileged account blocked");
1.186     foxr     7326: 		return "no_priv_account_error\n";
                   7327: 	    }
                   7328: 
1.223     foxr     7329: 	    my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
1.224     foxr     7330: 
                   7331: 	    my $lc_error_file  = $execdir."/tmp/lcuseradd".$$.".status";
1.91      albertel 7332: 	    {
                   7333: 		&Debug("Executing external: ".$execpath);
1.98      foxr     7334: 		&Debug("user  = ".$uname.", Password =". $npass);
1.132     matthew  7335: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91      albertel 7336: 		print $se "$uname\n";
1.483   ! www      7337:                 print $se "$udom\n";
1.91      albertel 7338: 		print $se "$npass\n";
                   7339: 		print $se "$npass\n";
1.223     foxr     7340: 		print $se "$lc_error_file\n"; # Status -> unique file.
1.97      foxr     7341: 	    }
1.285     foxr     7342: 	    if (-r $lc_error_file) {
                   7343: 		&Debug("Opening error file: $lc_error_file");
                   7344: 		my $error = IO::File->new("< $lc_error_file");
                   7345: 		my $useraddok = <$error>;
                   7346: 		$error->close;
                   7347: 		unlink($lc_error_file);
                   7348: 		
                   7349: 		chomp $useraddok;
                   7350: 	
                   7351: 		if($useraddok > 0) {
                   7352: 		    my $error_text = &lcuseraddstrerror($useraddok);
                   7353: 		    &logthis("Failed lcuseradd: $error_text");
1.390     raeburn  7354: 		    $result = "lcuseradd_failed:$error_text";
1.285     foxr     7355: 		}  else {
                   7356: 		    my $pf = IO::File->new(">$passfilename");
                   7357: 		    if($pf) {
                   7358: 			print $pf "unix:\n";
                   7359: 		    } else {
                   7360: 			$result = "pass_file_failed_error";
                   7361: 		    }
                   7362: 		}
1.224     foxr     7363: 	    }  else {
1.285     foxr     7364: 		&Debug("Could not locate lcuseradd error: $lc_error_file");
                   7365: 		$result="bug_lcuseradd_no_output_file";
1.91      albertel 7366: 	    }
                   7367: 	}
                   7368:     } elsif ($umode eq 'none') {
                   7369: 	{
1.223     foxr     7370: 	    my $pf = IO::File->new("> $passfilename");
1.261     foxr     7371: 	    if($pf) {
                   7372: 		print $pf "none:\n";
                   7373: 	    } else {
                   7374: 		$result = "pass_file_failed_error";
                   7375: 	    }
1.91      albertel 7376: 	}
                   7377:     } else {
1.390     raeburn  7378: 	$result="auth_mode_error";
1.91      albertel 7379:     }
                   7380:     return $result;
1.121     albertel 7381: }
                   7382: 
1.265     albertel 7383: sub convert_photo {
                   7384:     my ($start,$dest)=@_;
                   7385:     system("convert $start $dest");
                   7386: }
                   7387: 
1.121     albertel 7388: sub sethost {
                   7389:     my ($remotereq) = @_;
                   7390:     my (undef,$hostid)=split(/:/,$remotereq);
1.322     albertel 7391:     # ignore sethost if we are already correct
                   7392:     if ($hostid eq $currenthostid) {
                   7393: 	return 'ok';
                   7394:     }
                   7395: 
1.121     albertel 7396:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
1.368     albertel 7397:     if (&Apache::lonnet::get_host_ip($perlvar{'lonHostID'}) 
                   7398: 	eq &Apache::lonnet::get_host_ip($hostid)) {
1.200     matthew  7399: 	$currenthostid  =$hostid;
1.369     albertel 7400: 	$currentdomainid=&Apache::lonnet::host_domain($hostid);
1.443     www      7401: #	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
1.121     albertel 7402:     } else {
                   7403: 	&logthis("Requested host id $hostid not an alias of ".
                   7404: 		 $perlvar{'lonHostID'}." refusing connection");
                   7405: 	return 'unable_to_set';
                   7406:     }
                   7407:     return 'ok';
                   7408: }
                   7409: 
                   7410: sub version {
                   7411:     my ($userinput)=@_;
                   7412:     $remoteVERSION=(split(/:/,$userinput))[1];
                   7413:     return "version:$VERSION";
1.127     albertel 7414: }
1.178     foxr     7415: 
1.447     raeburn  7416: sub get_usersession_config {
                   7417:     my ($dom,$name) = @_;
                   7418:     my ($usersessionconf,$cached)=&Apache::lonnet::is_cached_new($name,$dom);
                   7419:     if (defined($cached)) {
                   7420:         return $usersessionconf;
                   7421:     } else {
                   7422:         my %domconfig = &Apache::lonnet::get_dom('configuration',['usersessions'],$dom);
                   7423:         if (ref($domconfig{'usersessions'}) eq 'HASH') {
                   7424:             &Apache::lonnet::do_cache_new($name,$dom,$domconfig{'usersessions'},3600);
                   7425:             return $domconfig{'usersessions'};
                   7426:         }
                   7427:     }
                   7428:     return;
                   7429: }
1.200     matthew  7430: 
1.453     raeburn  7431: sub releasereqd_check {
1.457     raeburn  7432:     my ($cnum,$cdom,$key,$value,$major,$minor,$homecourses,$ids) = @_;
1.453     raeburn  7433:     my $home = &Apache::lonnet::homeserver($cnum,$cdom);
                   7434:     return if ($home eq 'no_host');
                   7435:     my ($reqdmajor,$reqdminor,$displayrole);
                   7436:     if ($cnum =~ /$LONCAPA::match_community/) {
                   7437:         if ($major eq '' && $minor eq '') {
                   7438:             return unless ((ref($ids) eq 'ARRAY') && 
                   7439:                            (grep(/^\Q$home\E$/,@{$ids})));
                   7440:         } else {
                   7441:             $reqdmajor = 2;
                   7442:             $reqdminor = 9;
                   7443:             return unless (&useable_role($reqdmajor,$reqdminor,$major,$minor));
                   7444:         }
                   7445:     }
1.457     raeburn  7446:     my $hashid = $cdom.':'.$cnum;
                   7447:     my ($courseinfo,$cached) =
                   7448:         &Apache::lonnet::is_cached_new('courseinfo',$hashid);
                   7449:     if (defined($cached)) {
                   7450:         if (ref($courseinfo) eq 'HASH') {
                   7451:             if (exists($courseinfo->{'releaserequired'})) {
                   7452:                 my ($reqdmajor,$reqdminor) = split(/\./,$courseinfo->{'releaserequired'});
                   7453:                 return unless (&useable_role($reqdmajor,$reqdminor,$major,$minor));
1.453     raeburn  7454:             }
1.457     raeburn  7455:         }
                   7456:     } else {
                   7457:         if (ref($ids) eq 'ARRAY') {
                   7458:             if (grep(/^\Q$home\E$/,@{$ids})) {
                   7459:                 if (ref($homecourses) eq 'HASH') {
                   7460:                     if (ref($homecourses->{$hashid}) eq 'ARRAY') {
                   7461:                         push(@{$homecourses->{$hashid}},{$key=>$value});
                   7462:                     } else {
                   7463:                         $homecourses->{$hashid} = [{$key=>$value}];
1.453     raeburn  7464:                     }
                   7465:                 }
1.457     raeburn  7466:                 return;
1.453     raeburn  7467:             }
1.457     raeburn  7468:         }
                   7469:         my $courseinfo = &get_courseinfo_hash($cnum,$cdom,$home);
                   7470:         if (ref($courseinfo) eq 'HASH') {
                   7471:             if (exists($courseinfo->{'releaserequired'})) {
                   7472:                 my ($reqdmajor,$reqdminor) = split(/\./,$courseinfo->{'releaserequired'});
                   7473:                 return unless (&useable_role($reqdmajor,$reqdminor,$major,$minor));
1.453     raeburn  7474:             }
1.466     raeburn  7475:         } else {
                   7476:             return;
1.453     raeburn  7477:         }
                   7478:     }
                   7479:     return 1;
                   7480: }
                   7481: 
1.450     raeburn  7482: sub get_courseinfo_hash {
                   7483:     my ($cnum,$cdom,$home) = @_;
1.466     raeburn  7484:     my %info;
                   7485:     eval {
                   7486:         local($SIG{ALRM}) = sub { die "timeout\n"; };
                   7487:         local($SIG{__DIE__})='DEFAULT';
                   7488:         alarm(3);
                   7489:         %info = &Apache::lonnet::courseiddump($cdom,'.',1,'.','.',$cnum,1,[$home],'.');
                   7490:         alarm(0);
                   7491:     };
                   7492:     if ($@) {
                   7493:         if ($@ eq "timeout\n") {
                   7494:             &logthis("<font color='blue'>WARNING courseiddump for $cnum:$cdom from $home timedout</font>");
                   7495:         } else {
                   7496:             &logthis("<font color='yellow'>WARNING unexpected error during eval of call for courseiddump from $home</font>");
                   7497:         }
                   7498:     } else {
                   7499:         if (ref($info{$cdom.'_'.$cnum}) eq 'HASH') {
                   7500:             my $hashid = $cdom.':'.$cnum;
                   7501:             return &Apache::lonnet::do_cache_new('courseinfo',$hashid,$info{$cdom.'_'.$cnum},600);
                   7502:         }
1.453     raeburn  7503:     }
                   7504:     return;
                   7505: }
                   7506: 
                   7507: sub check_homecourses {
                   7508:     my ($homecourses,$udom,$regexp,$count,$range,$start,$end,$major,$minor) = @_;
                   7509:     my ($result,%addtocache);
1.459     raeburn  7510:     my $yesterday = time - 24*3600; 
1.453     raeburn  7511:     if (ref($homecourses) eq 'HASH') {
1.459     raeburn  7512:         my (%okcourses,%courseinfo,%recent);
1.453     raeburn  7513:         my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
                   7514:         if ($hashref) {
                   7515:             while (my ($key,$value) = each(%$hashref)) {
                   7516:                 my $unesc_key = &unescape($key);
1.459     raeburn  7517:                 if ($unesc_key =~ /^lasttime:(\w+)$/) {
                   7518:                     my $cid = $1;
                   7519:                     $cid =~ s/_/:/;
                   7520:                     if ($value > $yesterday ) {
                   7521:                         $recent{$cid} = 1;
                   7522:                     }
                   7523:                     next;
                   7524:                 }
1.453     raeburn  7525:                 my $items = &Apache::lonnet::thaw_unescape($value);
                   7526:                 if (ref($items) eq 'HASH') {
                   7527:                     my $hashid = $unesc_key;
                   7528:                     $hashid =~ s/_/:/;
1.459     raeburn  7529:                     $courseinfo{$hashid} = $items;
1.453     raeburn  7530:                     if (ref($homecourses->{$hashid}) eq 'ARRAY') {
                   7531:                         my ($reqdmajor,$reqdminor) = split(/\./,$items->{'releaserequired'});
                   7532:                         if (&useable_role($reqdmajor,$reqdminor,$major,$minor)) {
                   7533:                             $okcourses{$hashid} = 1;
                   7534:                         }
                   7535:                     }
                   7536:                 }
                   7537:             }
                   7538:             unless (&untie_domain_hash($hashref)) {
                   7539:                 &logthis('Failed to untie tied hash for nohist_courseids.db');
                   7540:             }
                   7541:         } else {
                   7542:             &logthis('Failed to tie hash for nohist_courseids.db');
                   7543:             return;
                   7544:         }
1.459     raeburn  7545:         foreach my $hashid (keys(%recent)) {
1.465     raeburn  7546:             my ($result,$cached)=&Apache::lonnet::is_cached_new('courseinfo',$hashid);
1.464     raeburn  7547:             unless ($cached) {
                   7548:                 &Apache::lonnet::do_cache_new('courseinfo',$hashid,$courseinfo{$hashid},600);
                   7549:             }
1.459     raeburn  7550:         }
                   7551:         foreach my $hashid (keys(%{$homecourses})) {
                   7552:             next if ($recent{$hashid});
                   7553:             &Apache::lonnet::do_cache_new('courseinfo',$hashid,$courseinfo{$hashid},600);
                   7554:         }
1.453     raeburn  7555:         foreach my $hashid (keys(%okcourses)) {
                   7556:             if (ref($homecourses->{$hashid}) eq 'ARRAY') {
                   7557:                 foreach my $role (@{$homecourses->{$hashid}}) {
                   7558:                     if (ref($role) eq 'HASH') {
                   7559:                         while (my ($key,$value) = each(%{$role})) {
                   7560:                             if ($regexp eq '.') {
                   7561:                                 $count++;
                   7562:                                 if (defined($range) && $count >= $end)   { last; }
                   7563:                                 if (defined($range) && $count <  $start) { next; }
                   7564:                                 $result.=$key.'='.$value.'&';
                   7565:                             } else {
                   7566:                                 my $unescapeKey = &unescape($key);
                   7567:                                 if (eval('$unescapeKey=~/$regexp/')) {
                   7568:                                     $count++;
                   7569:                                     if (defined($range) && $count >= $end)   { last; }
                   7570:                                     if (defined($range) && $count <  $start) { next; }
                   7571:                                     $result.="$key=$value&";
                   7572:                                 }
                   7573:                             }
                   7574:                         }
                   7575:                     }
                   7576:                 }
                   7577:             }
1.450     raeburn  7578:         }
                   7579:     }
1.453     raeburn  7580:     return $result;
                   7581: }
                   7582: 
                   7583: sub useable_role {
                   7584:     my ($reqdmajor,$reqdminor,$major,$minor) = @_; 
                   7585:     if ($reqdmajor ne '' && $reqdminor ne '') {
                   7586:         return if (($major eq '' && $minor eq '') ||
                   7587:                    ($major < $reqdmajor) ||
                   7588:                    (($major == $reqdmajor) && ($minor < $reqdminor)));
                   7589:     }
                   7590:     return 1;
1.450     raeburn  7591: }
                   7592: 
1.471     raeburn  7593: sub distro_and_arch {
                   7594:     return $dist.':'.$arch;
                   7595: }
                   7596: 
1.61      harris41 7597: # ----------------------------------- POD (plain old documentation, CPAN style)
                   7598: 
                   7599: =head1 NAME
                   7600: 
                   7601: lond - "LON Daemon" Server (port "LOND" 5663)
                   7602: 
                   7603: =head1 SYNOPSIS
                   7604: 
1.74      harris41 7605: Usage: B<lond>
                   7606: 
                   7607: Should only be run as user=www.  This is a command-line script which
                   7608: is invoked by B<loncron>.  There is no expectation that a typical user
                   7609: will manually start B<lond> from the command-line.  (In other words,
                   7610: DO NOT START B<lond> YOURSELF.)
1.61      harris41 7611: 
                   7612: =head1 DESCRIPTION
                   7613: 
1.74      harris41 7614: There are two characteristics associated with the running of B<lond>,
                   7615: PROCESS MANAGEMENT (starting, stopping, handling child processes)
                   7616: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
                   7617: subscriptions, etc).  These are described in two large
                   7618: sections below.
                   7619: 
                   7620: B<PROCESS MANAGEMENT>
                   7621: 
1.61      harris41 7622: Preforker - server who forks first. Runs as a daemon. HUPs.
                   7623: Uses IDEA encryption
                   7624: 
1.74      harris41 7625: B<lond> forks off children processes that correspond to the other servers
                   7626: in the network.  Management of these processes can be done at the
                   7627: parent process level or the child process level.
                   7628: 
                   7629: B<logs/lond.log> is the location of log messages.
                   7630: 
                   7631: The process management is now explained in terms of linux shell commands,
                   7632: subroutines internal to this code, and signal assignments:
                   7633: 
                   7634: =over 4
                   7635: 
                   7636: =item *
                   7637: 
                   7638: PID is stored in B<logs/lond.pid>
                   7639: 
                   7640: This is the process id number of the parent B<lond> process.
                   7641: 
                   7642: =item *
                   7643: 
                   7644: SIGTERM and SIGINT
                   7645: 
                   7646: Parent signal assignment:
                   7647:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   7648: 
                   7649: Child signal assignment:
                   7650:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
                   7651: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
                   7652:  to restart a new child.)
                   7653: 
                   7654: Command-line invocations:
                   7655:  B<kill> B<-s> SIGTERM I<PID>
                   7656:  B<kill> B<-s> SIGINT I<PID>
                   7657: 
                   7658: Subroutine B<HUNTSMAN>:
                   7659:  This is only invoked for the B<lond> parent I<PID>.
                   7660: This kills all the children, and then the parent.
                   7661: The B<lonc.pid> file is cleared.
                   7662: 
                   7663: =item *
                   7664: 
                   7665: SIGHUP
                   7666: 
                   7667: Current bug:
                   7668:  This signal can only be processed the first time
                   7669: on the parent process.  Subsequent SIGHUP signals
                   7670: have no effect.
                   7671: 
                   7672: Parent signal assignment:
                   7673:  $SIG{HUP}  = \&HUPSMAN;
                   7674: 
                   7675: Child signal assignment:
                   7676:  none (nothing happens)
                   7677: 
                   7678: Command-line invocations:
                   7679:  B<kill> B<-s> SIGHUP I<PID>
                   7680: 
                   7681: Subroutine B<HUPSMAN>:
                   7682:  This is only invoked for the B<lond> parent I<PID>,
                   7683: This kills all the children, and then the parent.
                   7684: The B<lond.pid> file is cleared.
                   7685: 
                   7686: =item *
                   7687: 
                   7688: SIGUSR1
                   7689: 
                   7690: Parent signal assignment:
                   7691:  $SIG{USR1} = \&USRMAN;
                   7692: 
                   7693: Child signal assignment:
                   7694:  $SIG{USR1}= \&logstatus;
                   7695: 
                   7696: Command-line invocations:
                   7697:  B<kill> B<-s> SIGUSR1 I<PID>
                   7698: 
                   7699: Subroutine B<USRMAN>:
                   7700:  When invoked for the B<lond> parent I<PID>,
                   7701: SIGUSR1 is sent to all the children, and the status of
                   7702: each connection is logged.
1.144     foxr     7703: 
                   7704: =item *
                   7705: 
                   7706: SIGUSR2
                   7707: 
                   7708: Parent Signal assignment:
                   7709:     $SIG{USR2} = \&UpdateHosts
                   7710: 
                   7711: Child signal assignment:
                   7712:     NONE
                   7713: 
1.74      harris41 7714: 
                   7715: =item *
                   7716: 
                   7717: SIGCHLD
                   7718: 
                   7719: Parent signal assignment:
                   7720:  $SIG{CHLD} = \&REAPER;
                   7721: 
                   7722: Child signal assignment:
                   7723:  none
                   7724: 
                   7725: Command-line invocations:
                   7726:  B<kill> B<-s> SIGCHLD I<PID>
                   7727: 
                   7728: Subroutine B<REAPER>:
                   7729:  This is only invoked for the B<lond> parent I<PID>.
                   7730: Information pertaining to the child is removed.
                   7731: The socket port is cleaned up.
                   7732: 
                   7733: =back
                   7734: 
                   7735: B<SERVER-SIDE ACTIVITIES>
                   7736: 
                   7737: Server-side information can be accepted in an encrypted or non-encrypted
                   7738: method.
                   7739: 
                   7740: =over 4
                   7741: 
                   7742: =item ping
                   7743: 
                   7744: Query a client in the hosts.tab table; "Are you there?"
                   7745: 
                   7746: =item pong
                   7747: 
                   7748: Respond to a ping query.
                   7749: 
                   7750: =item ekey
                   7751: 
                   7752: Read in encrypted key, make cipher.  Respond with a buildkey.
                   7753: 
                   7754: =item load
                   7755: 
                   7756: Respond with CPU load based on a computation upon /proc/loadavg.
                   7757: 
                   7758: =item currentauth
                   7759: 
                   7760: Reply with current authentication information (only over an
                   7761: encrypted channel).
                   7762: 
                   7763: =item auth
                   7764: 
                   7765: Only over an encrypted channel, reply as to whether a user's
                   7766: authentication information can be validated.
                   7767: 
                   7768: =item passwd
                   7769: 
                   7770: Allow for a password to be set.
                   7771: 
                   7772: =item makeuser
                   7773: 
                   7774: Make a user.
                   7775: 
                   7776: =item passwd
                   7777: 
                   7778: Allow for authentication mechanism and password to be changed.
                   7779: 
                   7780: =item home
1.61      harris41 7781: 
1.74      harris41 7782: Respond to a question "are you the home for a given user?"
                   7783: 
                   7784: =item update
                   7785: 
                   7786: Update contents of a subscribed resource.
                   7787: 
                   7788: =item unsubscribe
                   7789: 
                   7790: The server is unsubscribing from a resource.
                   7791: 
                   7792: =item subscribe
                   7793: 
                   7794: The server is subscribing to a resource.
                   7795: 
                   7796: =item log
                   7797: 
                   7798: Place in B<logs/lond.log>
                   7799: 
                   7800: =item put
                   7801: 
                   7802: stores hash in namespace
                   7803: 
1.230     foxr     7804: =item rolesputy
1.74      harris41 7805: 
                   7806: put a role into a user's environment
                   7807: 
                   7808: =item get
                   7809: 
                   7810: returns hash with keys from array
                   7811: reference filled in from namespace
                   7812: 
                   7813: =item eget
                   7814: 
                   7815: returns hash with keys from array
                   7816: reference filled in from namesp (encrypts the return communication)
                   7817: 
                   7818: =item rolesget
                   7819: 
                   7820: get a role from a user's environment
                   7821: 
                   7822: =item del
                   7823: 
                   7824: deletes keys out of array from namespace
                   7825: 
                   7826: =item keys
                   7827: 
                   7828: returns namespace keys
                   7829: 
                   7830: =item dump
                   7831: 
                   7832: dumps the complete (or key matching regexp) namespace into a hash
                   7833: 
                   7834: =item store
                   7835: 
                   7836: stores hash permanently
                   7837: for this url; hashref needs to be given and should be a \%hashname; the
                   7838: remaining args aren't required and if they aren't passed or are '' they will
                   7839: be derived from the ENV
                   7840: 
                   7841: =item restore
                   7842: 
                   7843: returns a hash for a given url
                   7844: 
                   7845: =item querysend
                   7846: 
                   7847: Tells client about the lonsql process that has been launched in response
                   7848: to a sent query.
                   7849: 
                   7850: =item queryreply
                   7851: 
                   7852: Accept information from lonsql and make appropriate storage in temporary
                   7853: file space.
                   7854: 
                   7855: =item idput
                   7856: 
                   7857: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
                   7858: for each student, defined perhaps by the institutional Registrar.)
                   7859: 
                   7860: =item idget
                   7861: 
                   7862: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
                   7863: for each student, defined perhaps by the institutional Registrar.)
                   7864: 
                   7865: =item tmpput
                   7866: 
                   7867: Accept and store information in temporary space.
                   7868: 
                   7869: =item tmpget
                   7870: 
                   7871: Send along temporarily stored information.
                   7872: 
                   7873: =item ls
                   7874: 
                   7875: List part of a user's directory.
                   7876: 
1.135     foxr     7877: =item pushtable
                   7878: 
                   7879: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
                   7880: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
                   7881: must be restored manually in case of a problem with the new table file.
                   7882: pushtable requires that the request be encrypted and validated via
                   7883: ValidateManager.  The form of the command is:
                   7884: enc:pushtable tablename <tablecontents> \n
                   7885: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
                   7886: cleartext newline.
                   7887: 
1.74      harris41 7888: =item Hanging up (exit or init)
                   7889: 
                   7890: What to do when a client tells the server that they (the client)
                   7891: are leaving the network.
                   7892: 
                   7893: =item unknown command
                   7894: 
                   7895: If B<lond> is sent an unknown command (not in the list above),
                   7896: it replys to the client "unknown_cmd".
1.135     foxr     7897: 
1.74      harris41 7898: 
                   7899: =item UNKNOWN CLIENT
                   7900: 
                   7901: If the anti-spoofing algorithm cannot verify the client,
                   7902: the client is rejected (with a "refused" message sent
                   7903: to the client, and the connection is closed.
                   7904: 
                   7905: =back
1.61      harris41 7906: 
                   7907: =head1 PREREQUISITES
                   7908: 
                   7909: IO::Socket
                   7910: IO::File
                   7911: Apache::File
                   7912: POSIX
                   7913: Crypt::IDEA
                   7914: LWP::UserAgent()
                   7915: GDBM_File
                   7916: Authen::Krb4
1.91      albertel 7917: Authen::Krb5
1.61      harris41 7918: 
                   7919: =head1 COREQUISITES
                   7920: 
                   7921: =head1 OSNAMES
                   7922: 
                   7923: linux
                   7924: 
                   7925: =head1 SCRIPT CATEGORIES
                   7926: 
                   7927: Server/Process
                   7928: 
                   7929: =cut
1.409     foxr     7930: 
                   7931: 
                   7932: =pod
                   7933: 
                   7934: =head1 LOG MESSAGES
                   7935: 
                   7936: The messages below can be emitted in the lond log.  This log is located
                   7937: in ~httpd/perl/logs/lond.log  Many log messages have HTML encapsulation
                   7938: to provide coloring if examined from inside a web page. Some do not.
                   7939: Where color is used, the colors are; Red for sometihhng to get excited
                   7940: about and to follow up on. Yellow for something to keep an eye on to
                   7941: be sure it does not get worse, Green,and Blue for informational items.
                   7942: 
                   7943: In the discussions below, sometimes reference is made to ~httpd
                   7944: when describing file locations.  There isn't really an httpd 
                   7945: user, however there is an httpd directory that gets installed in the
                   7946: place that user home directories go.  On linux, this is usually
                   7947: (always?) /home/httpd.
                   7948: 
                   7949: 
                   7950: Some messages are colorless.  These are usually (not always)
                   7951: Green/Blue color level messages.
                   7952: 
                   7953: =over 2
                   7954: 
                   7955: =item (Red)  LocalConnection rejecting non local: <ip> ne 127.0.0.1
                   7956: 
                   7957: A local connection negotiation was attempted by
                   7958: a host whose IP address was not 127.0.0.1.
                   7959: The socket is closed and the child will exit.
                   7960: lond has three ways to establish an encyrption
                   7961: key with a client:
                   7962: 
                   7963: =over 2
                   7964: 
                   7965: =item local 
                   7966: 
                   7967: The key is written and read from a file.
                   7968: This is only valid for connections from localhost.
                   7969: 
                   7970: =item insecure 
                   7971: 
                   7972: The key is generated by the server and
                   7973: transmitted to the client.
                   7974: 
                   7975: =item  ssl (secure)
                   7976: 
                   7977: An ssl connection is negotiated with the client,
                   7978: the key is generated by the server and sent to the 
                   7979: client across this ssl connection before the
                   7980: ssl connectionis terminated and clear text
                   7981: transmission resumes.
                   7982: 
                   7983: =back
                   7984: 
                   7985: =item (Red) LocalConnection: caller is insane! init = <init> and type = <type>
                   7986: 
                   7987: The client is local but has not sent an initialization
                   7988: string that is the literal "init:local"  The connection
                   7989: is closed and the child exits.
                   7990: 
                   7991: =item Red CRITICAL Can't get key file <error>        
                   7992: 
                   7993: SSL key negotiation is being attempted but the call to
                   7994: lonssl::KeyFile  failed.  This usually means that the
                   7995: configuration file is not correctly defining or protecting
                   7996: the directories/files lonCertificateDirectory or
                   7997: lonnetPrivateKey
                   7998: <error> is a string that describes the reason that
                   7999: the key file could not be located.
                   8000: 
                   8001: =item (Red) CRITICAL  Can't get certificates <error>  
                   8002: 
                   8003: SSL key negotiation failed because we were not able to retrives our certificate
                   8004: or the CA's certificate in the call to lonssl::CertificateFile
                   8005: <error> is the textual reason this failed.  Usual reasons:
                   8006: 
                   8007: =over 2
                   8008:        
                   8009: =item Apache config file for loncapa  incorrect:
                   8010:  
                   8011: one of the variables 
                   8012: lonCertificateDirectory, lonnetCertificateAuthority, or lonnetCertificate
                   8013: undefined or incorrect
                   8014: 
                   8015: =item Permission error:
                   8016: 
                   8017: The directory pointed to by lonCertificateDirectory is not readable by lond
                   8018: 
                   8019: =item Permission error:
                   8020: 
                   8021: Files in the directory pointed to by lonCertificateDirectory are not readable by lond.
                   8022: 
                   8023: =item Installation error:                         
                   8024: 
                   8025: Either the certificate authority file or the certificate have not
                   8026: been installed in lonCertificateDirectory.
                   8027: 
                   8028: =item (Red) CRITICAL SSL Socket promotion failed:  <err> 
                   8029: 
                   8030: The promotion of the connection from plaintext to SSL failed
                   8031: <err> is the reason for the failure.  There are two
                   8032: system calls involved in the promotion (one of which failed), 
                   8033: a dup to produce
                   8034: a second fd on the raw socket over which the encrypted data
                   8035: will flow and IO::SOcket::SSL->new_from_fd which creates
                   8036: the SSL connection on the duped fd.
                   8037: 
                   8038: =item (Blue)   WARNING client did not respond to challenge 
                   8039: 
                   8040: This occurs on an insecure (non SSL) connection negotiation request.
                   8041: lond generates some number from the time, the PID and sends it to
                   8042: the client.  The client must respond by echoing this information back.
                   8043: If the client does not do so, that's a violation of the challenge
                   8044: protocols and the connection will be failed.
                   8045: 
                   8046: =item (Red) No manager table. Nobody can manage!!    
                   8047: 
                   8048: lond has the concept of privileged hosts that
                   8049: can perform remote management function such
                   8050: as update the hosts.tab.   The manager hosts
                   8051: are described in the 
                   8052: ~httpd/lonTabs/managers.tab file.
                   8053: this message is logged if this file is missing.
                   8054: 
                   8055: 
                   8056: =item (Green) Registering manager <dnsname> as <cluster_name> with <ipaddress>
                   8057: 
                   8058: Reports the successful parse and registration
                   8059: of a specific manager. 
                   8060: 
                   8061: =item Green existing host <clustername:dnsname>  
                   8062: 
                   8063: The manager host is already defined in the hosts.tab
                   8064: the information in that table, rather than the info in the
                   8065: manager table will be used to determine the manager's ip.
                   8066: 
                   8067: =item (Red) Unable to craete <filename>                 
                   8068: 
                   8069: lond has been asked to create new versions of an administrative
                   8070: file (by a manager).  When this is done, the new file is created
                   8071: in a temp file and then renamed into place so that there are always
                   8072: usable administrative files, even if the update fails.  This failure
                   8073: message means that the temp file could not be created.
                   8074: The update is abandoned, and the old file is available for use.
                   8075: 
                   8076: =item (Green) CopyFile from <oldname> to <newname> failed
                   8077: 
                   8078: In an update of administrative files, the copy of the existing file to a
                   8079: backup file failed.  The installation of the new file may still succeed,
                   8080: but there will not be a back up file to rever to (this should probably
                   8081: be yellow).
                   8082: 
                   8083: =item (Green) Pushfile: backed up <oldname> to <newname>
                   8084: 
                   8085: See above, the backup of the old administrative file succeeded.
                   8086: 
                   8087: =item (Red)  Pushfile: Unable to install <filename> <reason>
                   8088: 
                   8089: The new administrative file could not be installed.  In this case,
                   8090: the old administrative file is still in use.
                   8091: 
                   8092: =item (Green) Installed new < filename>.                      
                   8093: 
                   8094: The new administrative file was successfullly installed.                                               
                   8095: 
                   8096: =item (Red) Reinitializing lond pid=<pid>                    
                   8097: 
                   8098: The lonc child process <pid> will be sent a USR2 
                   8099: signal.
                   8100: 
                   8101: =item (Red) Reinitializing self                                    
                   8102: 
                   8103: We've been asked to re-read our administrative files,and
                   8104: are doing so.
                   8105: 
                   8106: =item (Yellow) error:Invalid process identifier <ident>  
                   8107: 
                   8108: A reinit command was received, but the target part of the 
                   8109: command was not valid.  It must be either
                   8110: 'lond' or 'lonc' but was <ident>
                   8111: 
                   8112: =item (Green) isValideditCommand checking: Command = <command> Key = <key> newline = <newline>
                   8113: 
                   8114: Checking to see if lond has been handed a valid edit
                   8115: command.  It is possible the edit command is not valid
                   8116: in that case there are no log messages to indicate that.
                   8117: 
                   8118: =item Result of password change for  <username> pwchange_success
                   8119: 
                   8120: The password for <username> was
                   8121: successfully changed.
                   8122: 
                   8123: =item Unable to open <user> passwd to change password
                   8124: 
                   8125: Could not rewrite the 
                   8126: internal password file for a user
                   8127: 
                   8128: =item Result of password change for <user> : <result>
                   8129:                                                                      
                   8130: A unix password change for <user> was attempted 
                   8131: and the pipe returned <result>  
                   8132: 
                   8133: =item LWP GET: <message> for <fname> (<remoteurl>)
                   8134: 
                   8135: The lightweight process fetch for a resource failed
                   8136: with <message> the local filename that should
                   8137: have existed/been created was  <fname> the
                   8138: corresponding URI: <remoteurl>  This is emitted in several
                   8139: places.
                   8140: 
                   8141: =item Unable to move <transname> to <destname>     
                   8142: 
                   8143: From fetch_user_file_handler - the user file was replicated but could not
                   8144: be mv'd to its final location.
                   8145: 
                   8146: =item Looking for <domain> <username>              
                   8147: 
                   8148: From user_has_session_handler - This should be a Debug call instead
                   8149: it indicates lond is about to check whether the specified user has a 
                   8150: session active on the specified domain on the local host.
                   8151: 
                   8152: =item Client <ip> (<name>) hanging up: <input>     
                   8153: 
                   8154: lond has been asked to exit by its client.  The <ip> and <name> identify the
                   8155: client systemand <input> is the full exit command sent to the server.
                   8156: 
                   8157: =item Red CRITICAL: ABNORMAL EXIT. child <pid> for server <hostname> died through a crass with this error->[<message>].
                   8158:                                                  
                   8159: A lond child terminated.  NOte that this termination can also occur when the
                   8160: child receives the QUIT or DIE signals.  <pid> is the process id of the child,
                   8161: <hostname> the host lond is working for, and <message> the reason the child died
                   8162: to the best of our ability to get it (I would guess that any numeric value
                   8163: represents and errno value).  This is immediately followed by
                   8164: 
                   8165: =item  Famous last words: Catching exception - <log> 
                   8166: 
                   8167: Where log is some recent information about the state of the child.
                   8168: 
                   8169: =item Red CRITICAL: TIME OUT <pid>                     
                   8170: 
                   8171: Some timeout occured for server <pid>.  THis is normally a timeout on an LWP
                   8172: doing an HTTP::GET.
                   8173: 
                   8174: =item child <pid> died                              
                   8175: 
                   8176: The reaper caught a SIGCHILD for the lond child process <pid>
                   8177: This should be modified to also display the IP of the dying child
                   8178: $children{$pid}
                   8179: 
                   8180: =item Unknown child 0 died                           
                   8181: A child died but the wait for it returned a pid of zero which really should not
                   8182: ever happen. 
                   8183: 
                   8184: =item Child <which> - <pid> looks like we missed it's death 
                   8185: 
                   8186: When a sigchild is received, the reaper process checks all children to see if they are
                   8187: alive.  If children are dying quite quickly, the lack of signal queuing can mean
                   8188: that a signal hearalds the death of more than one child.  If so this message indicates
                   8189: which other one died. <which> is the ip of a dead child
                   8190: 
                   8191: =item Free socket: <shutdownretval>                
                   8192: 
                   8193: The HUNTSMAN sub was called due to a SIGINT in a child process.  The socket is being shutdown.
                   8194: for whatever reason, <shutdownretval> is printed but in fact shutdown() is not documented
                   8195: to return anything. This is followed by: 
                   8196: 
                   8197: =item Red CRITICAL: Shutting down                       
                   8198: 
                   8199: Just prior to exit.
                   8200: 
                   8201: =item Free socket: <shutdownretval>                 
                   8202: 
                   8203: The HUPSMAN sub was called due to a SIGHUP.  all children get killsed, and lond execs itself.
                   8204: This is followed by:
                   8205: 
                   8206: =item (Red) CRITICAL: Restarting                         
                   8207: 
                   8208: lond is about to exec itself to restart.
                   8209: 
                   8210: =item (Blue) Updating connections                        
                   8211: 
                   8212: (In response to a USR2).  All the children (except the one for localhost)
                   8213: are about to be killed, the hosts tab reread, and Apache reloaded via apachereload.
                   8214: 
                   8215: =item (Blue) UpdateHosts killing child <pid> for ip <ip>   
                   8216: 
                   8217: Due to USR2 as above.
                   8218: 
                   8219: =item (Green) keeping child for ip <ip> (pid = <pid>)    
                   8220: 
                   8221: In response to USR2 as above, the child indicated is not being restarted because
                   8222: it's assumed that we'll always need a child for the localhost.
                   8223: 
                   8224: 
                   8225: =item Going to check on the children                
                   8226: 
                   8227: Parent is about to check on the health of the child processes.
                   8228: Note that this is in response to a USR1 sent to the parent lond.
                   8229: there may be one or more of the next two messages:
                   8230: 
                   8231: =item <pid> is dead                                 
                   8232: 
                   8233: A child that we have in our child hash as alive has evidently died.
                   8234: 
                   8235: =item  Child <pid> did not respond                   
                   8236: 
                   8237: In the health check the child <pid> did not update/produce a pid_.txt
                   8238: file when sent it's USR1 signal.  That process is killed with a 9 signal, as it's
                   8239: assumed to be hung in some un-fixable way.
                   8240: 
                   8241: =item Finished checking children                   
                   8242:  
                   8243: Master processs's USR1 processing is cojmplete.
                   8244: 
                   8245: =item (Red) CRITICAL: ------- Starting ------            
                   8246: 
                   8247: (There are more '-'s on either side).  Lond has forked itself off to 
                   8248: form a new session and is about to start actual initialization.
                   8249: 
                   8250: =item (Green) Attempting to start child (<client>)       
                   8251: 
                   8252: Started a new child process for <client>.  Client is IO::Socket object
                   8253: connected to the child.  This was as a result of a TCP/IP connection from a client.
                   8254: 
                   8255: =item Unable to determine who caller was, getpeername returned nothing
                   8256:                                                   
                   8257: In child process initialization.  either getpeername returned undef or
                   8258: a zero sized object was returned.  Processing continues, but in my opinion,
                   8259: this should be cause for the child to exit.
                   8260: 
                   8261: =item Unable to determine clientip                  
                   8262: 
                   8263: In child process initialization.  The peer address from getpeername was not defined.
                   8264: The client address is stored as "Unavailable" and processing continues.
                   8265: 
                   8266: =item (Yellow) INFO: Connection <ip> <name> connection type = <type>
                   8267:                                                   
                   8268: In child initialization.  A good connectionw as received from <ip>.
                   8269: 
                   8270: =over 2
                   8271: 
                   8272: =item <name> 
                   8273: 
                   8274: is the name of the client from hosts.tab.
                   8275: 
                   8276: =item <type> 
                   8277: 
                   8278: Is the connection type which is either 
                   8279: 
                   8280: =over 2
                   8281: 
                   8282: =item manager 
                   8283: 
                   8284: The connection is from a manager node, not in hosts.tab
                   8285: 
                   8286: =item client  
                   8287: 
                   8288: the connection is from a non-manager in the hosts.tab
                   8289: 
                   8290: =item both
                   8291: 
                   8292: The connection is from a manager in the hosts.tab.
                   8293: 
                   8294: =back
                   8295: 
                   8296: =back
                   8297: 
                   8298: =item (Blue) Certificates not installed -- trying insecure auth
                   8299: 
                   8300: One of the certificate file, key file or
                   8301: certificate authority file could not be found for a client attempting
                   8302: SSL connection intiation.  COnnection will be attemptied in in-secure mode.
                   8303: (this would be a system with an up to date lond that has not gotten a 
                   8304: certificate from us).
                   8305: 
                   8306: =item (Green)  Successful local authentication            
                   8307: 
                   8308: A local connection successfully negotiated the encryption key. 
                   8309: In this case the IDEA key is in a file (that is hopefully well protected).
                   8310: 
                   8311: =item (Green) Successful ssl authentication with <client>  
                   8312: 
                   8313: The client (<client> is the peer's name in hosts.tab), has successfully
                   8314: negotiated an SSL connection with this child process.
                   8315: 
                   8316: =item (Green) Successful insecure authentication with <client>
                   8317:                                                    
                   8318: 
                   8319: The client has successfully negotiated an  insecure connection withthe child process.
                   8320: 
                   8321: =item (Yellow) Attempted insecure connection disallowed    
                   8322: 
                   8323: The client attempted and failed to successfully negotiate a successful insecure
                   8324: connection.  This can happen either because the variable londAllowInsecure is false
                   8325: or undefined, or becuse the child did not successfully echo back the challenge
                   8326: string.
                   8327: 
                   8328: 
                   8329: =back
                   8330: 
1.441     raeburn  8331: =back
                   8332: 
1.409     foxr     8333: 
                   8334: =cut

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