Annotation of loncom/lond, revision 1.360

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network
                      3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60      www         4: #
1.360   ! raeburn     5: # $Id: lond,v 1.359 2007/01/28 18:49:49 raeburn 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
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
1.178     foxr       23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
1.60      www        24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
1.161     foxr       27: 
                     28: 
1.60      www        29: # http://www.lon-capa.org/
                     30: #
1.54      harris41   31: 
1.134     albertel   32: use strict;
1.80      harris41   33: use lib '/home/httpd/lib/perl/';
1.325     albertel   34: use LONCAPA;
1.80      harris41   35: use LONCAPA::Configuration;
                     36: 
1.1       albertel   37: use IO::Socket;
                     38: use IO::File;
1.126     albertel   39: #use Apache::File;
1.1       albertel   40: use POSIX;
                     41: use Crypt::IDEA;
                     42: use LWP::UserAgent();
1.347     raeburn    43: use Digest::MD5 qw(md5_hex);
1.3       www        44: use GDBM_File;
                     45: use Authen::Krb4;
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;
1.169     foxr       52: use LONCAPA::ConfigFileEdit;
1.200     matthew    53: use LONCAPA::lonlocal;
                     54: use LONCAPA::lonssl;
1.221     albertel   55: use Fcntl qw(:flock);
1.1       albertel   56: 
1.239     foxr       57: my $DEBUG = 0;		       # Non zero to enable debug log entries.
1.77      foxr       58: 
1.57      www        59: my $status='';
                     60: my $lastlog='';
                     61: 
1.360   ! raeburn    62: my $VERSION='$Revision: 1.359 $'; #' stupid emacs
1.121     albertel   63: my $remoteVERSION;
1.214     foxr       64: my $currenthostid="default";
1.115     albertel   65: my $currentdomainid;
1.134     albertel   66: 
                     67: my $client;
1.200     matthew    68: my $clientip;			# IP address of client.
                     69: my $clientname;			# LonCAPA name of client.
1.140     foxr       70: 
1.134     albertel   71: my $server;
1.200     matthew    72: my $thisserver;			# DNS of us.
                     73: 
                     74: my $keymode;
1.198     foxr       75: 
1.207     foxr       76: my $cipher;			# Cipher key negotiated with client
                     77: my $tmpsnum = 0;		# Id of tmpputs.
                     78: 
1.178     foxr       79: # 
                     80: #   Connection type is:
                     81: #      client                   - All client actions are allowed
                     82: #      manager                  - only management functions allowed.
                     83: #      both                     - Both management and client actions are allowed
                     84: #
1.161     foxr       85: 
1.178     foxr       86: my $ConnectionType;
1.161     foxr       87: 
1.200     matthew    88: my %hostid;			# ID's for hosts in cluster by ip.
                     89: my %hostdom;			# LonCAPA domain for hosts in cluster.
1.307     albertel   90: my %hostname;			# DNSname -> ID's mapping.
1.200     matthew    91: my %hostip;			# IPs for hosts in cluster.
                     92: my %hostdns;			# ID's of hosts looked up by DNS name.
1.161     foxr       93: 
1.178     foxr       94: my %managers;			# Ip -> manager names
1.161     foxr       95: 
1.178     foxr       96: my %perlvar;			# Will have the apache conf defined perl vars.
1.134     albertel   97: 
1.178     foxr       98: #
1.207     foxr       99: #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
                    100: #    Each element of the hash contains a reference to an array that contains:
                    101: #          A reference to a sub that executes the request corresponding to the keyword.
                    102: #          A flag that is true if the request must be encoded to be acceptable.
                    103: #          A mask with bits as follows:
                    104: #                      CLIENT_OK    - Set when the function is allowed by ordinary clients
                    105: #                      MANAGER_OK   - Set when the function is allowed to manager clients.
                    106: #
                    107: my $CLIENT_OK  = 1;
                    108: my $MANAGER_OK = 2;
                    109: my %Dispatcher;
                    110: 
                    111: 
                    112: #
1.178     foxr      113: #  The array below are password error strings."
                    114: #
                    115: my $lastpwderror    = 13;		# Largest error number from lcpasswd.
                    116: my @passwderrors = ("ok",
1.287     foxr      117: 		   "pwchange_failure - lcpasswd must be run as user 'www'",
                    118: 		   "pwchange_failure - lcpasswd got incorrect number of arguments",
                    119: 		   "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
                    120: 		   "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
                    121: 		   "pwchange_failure - lcpasswd User does not exist.",
                    122: 		   "pwchange_failure - lcpasswd Incorrect current passwd",
                    123: 		   "pwchange_failure - lcpasswd Unable to su to root.",
                    124: 		   "pwchange_failure - lcpasswd Cannot set new passwd.",
                    125: 		   "pwchange_failure - lcpasswd Username has invalid characters",
                    126: 		   "pwchange_failure - lcpasswd Invalid characters in password",
                    127: 		   "pwchange_failure - lcpasswd User already exists", 
                    128:                    "pwchange_failure - lcpasswd Something went wrong with user addition.",
                    129: 		   "pwchange_failure - lcpasswd Password mismatch",
                    130: 		   "pwchange_failure - lcpasswd Error filename is invalid");
1.97      foxr      131: 
                    132: 
1.178     foxr      133: #  The array below are lcuseradd error strings.:
1.97      foxr      134: 
1.178     foxr      135: my $lastadderror = 13;
                    136: my @adderrors    = ("ok",
                    137: 		    "User ID mismatch, lcuseradd must run as user www",
                    138: 		    "lcuseradd Incorrect number of command line parameters must be 3",
                    139: 		    "lcuseradd Incorrect number of stdinput lines, must be 3",
                    140: 		    "lcuseradd Too many other simultaneous pwd changes in progress",
                    141: 		    "lcuseradd User does not exist",
                    142: 		    "lcuseradd Unable to make www member of users's group",
                    143: 		    "lcuseradd Unable to su to root",
                    144: 		    "lcuseradd Unable to set password",
                    145: 		    "lcuseradd Usrname has invalid characters",
                    146: 		    "lcuseradd Password has an invalid character",
                    147: 		    "lcuseradd User already exists",
                    148: 		    "lcuseradd Could not add user.",
                    149: 		    "lcuseradd Password mismatch");
1.97      foxr      150: 
1.96      foxr      151: 
1.207     foxr      152: 
                    153: #
                    154: #   Statistics that are maintained and dislayed in the status line.
                    155: #
1.212     foxr      156: my $Transactions = 0;		# Number of attempted transactions.
                    157: my $Failures     = 0;		# Number of transcations failed.
1.207     foxr      158: 
                    159: #   ResetStatistics: 
                    160: #      Resets the statistics counters:
                    161: #
                    162: sub ResetStatistics {
                    163:     $Transactions = 0;
                    164:     $Failures     = 0;
                    165: }
                    166: 
1.200     matthew   167: #------------------------------------------------------------------------
                    168: #
                    169: #   LocalConnection
                    170: #     Completes the formation of a locally authenticated connection.
                    171: #     This function will ensure that the 'remote' client is really the
                    172: #     local host.  If not, the connection is closed, and the function fails.
                    173: #     If so, initcmd is parsed for the name of a file containing the
                    174: #     IDEA session key.  The fie is opened, read, deleted and the session
                    175: #     key returned to the caller.
                    176: #
                    177: # Parameters:
                    178: #   $Socket      - Socket open on client.
                    179: #   $initcmd     - The full text of the init command.
                    180: #
                    181: # Implicit inputs:
                    182: #    $thisserver - Our DNS name.
                    183: #
                    184: # Returns:
                    185: #     IDEA session key on success.
                    186: #     undef on failure.
                    187: #
                    188: sub LocalConnection {
                    189:     my ($Socket, $initcmd) = @_;
1.277     albertel  190:     Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
                    191:     if($clientip ne "127.0.0.1") {
1.200     matthew   192: 	&logthis('<font color="red"> LocalConnection rejecting non local: '
1.277     albertel  193: 		 ."$clientip ne $thisserver </font>");
1.200     matthew   194: 	close $Socket;
                    195: 	return undef;
1.224     foxr      196:     }  else {
1.200     matthew   197: 	chomp($initcmd);	# Get rid of \n in filename.
                    198: 	my ($init, $type, $name) = split(/:/, $initcmd);
                    199: 	Debug(" Init command: $init $type $name ");
                    200: 
                    201: 	# Require that $init = init, and $type = local:  Otherwise
                    202: 	# the caller is insane:
                    203: 
                    204: 	if(($init ne "init") && ($type ne "local")) {
                    205: 	    &logthis('<font color = "red"> LocalConnection: caller is insane! '
                    206: 		     ."init = $init, and type = $type </font>");
                    207: 	    close($Socket);;
                    208: 	    return undef;
                    209: 		
                    210: 	}
                    211: 	#  Now get the key filename:
                    212: 
                    213: 	my $IDEAKey = lonlocal::ReadKeyFile($name);
                    214: 	return $IDEAKey;
                    215:     }
                    216: }
                    217: #------------------------------------------------------------------------------
                    218: #
                    219: #  SSLConnection
                    220: #   Completes the formation of an ssh authenticated connection. The
                    221: #   socket is promoted to an ssl socket.  If this promotion and the associated
                    222: #   certificate exchange are successful, the IDEA key is generated and sent
                    223: #   to the remote peer via the SSL tunnel. The IDEA key is also returned to
                    224: #   the caller after the SSL tunnel is torn down.
                    225: #
                    226: # Parameters:
                    227: #   Name              Type             Purpose
                    228: #   $Socket          IO::Socket::INET  Plaintext socket.
                    229: #
                    230: # Returns:
                    231: #    IDEA key on success.
                    232: #    undef on failure.
                    233: #
                    234: sub SSLConnection {
                    235:     my $Socket   = shift;
                    236: 
                    237:     Debug("SSLConnection: ");
                    238:     my $KeyFile         = lonssl::KeyFile();
                    239:     if(!$KeyFile) {
                    240: 	my $err = lonssl::LastError();
                    241: 	&logthis("<font color=\"red\"> CRITICAL"
                    242: 		 ."Can't get key file $err </font>");
                    243: 	return undef;
                    244:     }
                    245:     my ($CACertificate,
                    246: 	$Certificate) = lonssl::CertificateFile();
                    247: 
                    248: 
                    249:     # If any of the key, certificate or certificate authority 
                    250:     # certificate filenames are not defined, this can't work.
                    251: 
                    252:     if((!$Certificate) || (!$CACertificate)) {
                    253: 	my $err = lonssl::LastError();
                    254: 	&logthis("<font color=\"red\"> CRITICAL"
                    255: 		 ."Can't get certificates: $err </font>");
                    256: 
                    257: 	return undef;
                    258:     }
                    259:     Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
                    260: 
                    261:     # Indicate to our peer that we can procede with
                    262:     # a transition to ssl authentication:
                    263: 
                    264:     print $Socket "ok:ssl\n";
                    265: 
                    266:     Debug("Approving promotion -> ssl");
                    267:     #  And do so:
                    268: 
                    269:     my $SSLSocket = lonssl::PromoteServerSocket($Socket,
                    270: 						$CACertificate,
                    271: 						$Certificate,
                    272: 						$KeyFile);
                    273:     if(! ($SSLSocket) ) {	# SSL socket promotion failed.
                    274: 	my $err = lonssl::LastError();
                    275: 	&logthis("<font color=\"red\"> CRITICAL "
                    276: 		 ."SSL Socket promotion failed: $err </font>");
                    277: 	return undef;
                    278:     }
                    279:     Debug("SSL Promotion successful");
                    280: 
                    281:     # 
                    282:     #  The only thing we'll use the socket for is to send the IDEA key
                    283:     #  to the peer:
                    284: 
                    285:     my $Key = lonlocal::CreateCipherKey();
                    286:     print $SSLSocket "$Key\n";
                    287: 
                    288:     lonssl::Close($SSLSocket); 
                    289: 
                    290:     Debug("Key exchange complete: $Key");
                    291: 
                    292:     return $Key;
                    293: }
                    294: #
                    295: #     InsecureConnection: 
                    296: #        If insecure connections are allowd,
                    297: #        exchange a challenge with the client to 'validate' the
                    298: #        client (not really, but that's the protocol):
                    299: #        We produce a challenge string that's sent to the client.
                    300: #        The client must then echo the challenge verbatim to us.
                    301: #
                    302: #  Parameter:
                    303: #      Socket      - Socket open on the client.
                    304: #  Returns:
                    305: #      1           - success.
                    306: #      0           - failure (e.g.mismatch or insecure not allowed).
                    307: #
                    308: sub InsecureConnection {
                    309:     my $Socket  =  shift;
                    310: 
                    311:     #   Don't even start if insecure connections are not allowed.
                    312: 
                    313:     if(! $perlvar{londAllowInsecure}) {	# Insecure connections not allowed.
                    314: 	return 0;
                    315:     }
                    316: 
                    317:     #   Fabricate a challenge string and send it..
                    318: 
                    319:     my $challenge = "$$".time;	# pid + time.
                    320:     print $Socket "$challenge\n";
                    321:     &status("Waiting for challenge reply");
                    322: 
                    323:     my $answer = <$Socket>;
                    324:     $answer    =~s/\W//g;
                    325:     if($challenge eq $answer) {
                    326: 	return 1;
1.224     foxr      327:     } else {
1.200     matthew   328: 	logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
                    329: 	&status("No challenge reqply");
                    330: 	return 0;
                    331:     }
                    332:     
                    333: 
                    334: }
1.251     foxr      335: #
                    336: #   Safely execute a command (as long as it's not a shel command and doesn
                    337: #   not require/rely on shell escapes.   The function operates by doing a
                    338: #   a pipe based fork and capturing stdout and stderr  from the pipe.
                    339: #
                    340: # Formal Parameters:
                    341: #     $line                    - A line of text to be executed as a command.
                    342: # Returns:
                    343: #     The output from that command.  If the output is multiline the caller
                    344: #     must know how to split up the output.
                    345: #
                    346: #
                    347: sub execute_command {
                    348:     my ($line)    = @_;
                    349:     my @words     = split(/\s/, $line);	# Bust the command up into words.
                    350:     my $output    = "";
                    351: 
                    352:     my $pid = open(CHILD, "-|");
                    353:     
                    354:     if($pid) {			# Parent process
                    355: 	Debug("In parent process for execute_command");
                    356: 	my @data = <CHILD>;	# Read the child's outupt...
                    357: 	close CHILD;
                    358: 	foreach my $output_line (@data) {
                    359: 	    Debug("Adding $output_line");
                    360: 	    $output .= $output_line; # Presumably has a \n on it.
                    361: 	}
                    362: 
                    363:     } else {			# Child process
                    364: 	close (STDERR);
                    365: 	open  (STDERR, ">&STDOUT");# Combine stderr, and stdout...
                    366: 	exec(@words);		# won't return.
                    367:     }
                    368:     return $output;
                    369: }
                    370: 
1.200     matthew   371: 
1.140     foxr      372: #   GetCertificate: Given a transaction that requires a certificate,
                    373: #   this function will extract the certificate from the transaction
                    374: #   request.  Note that at this point, the only concept of a certificate
                    375: #   is the hostname to which we are connected.
                    376: #
                    377: #   Parameter:
                    378: #      request   - The request sent by our client (this parameterization may
                    379: #                  need to change when we really use a certificate granting
                    380: #                  authority.
                    381: #
                    382: sub GetCertificate {
                    383:     my $request = shift;
                    384: 
                    385:     return $clientip;
                    386: }
1.161     foxr      387: 
1.178     foxr      388: #
                    389: #   Return true if client is a manager.
                    390: #
                    391: sub isManager {
                    392:     return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
                    393: }
                    394: #
                    395: #   Return tru if client can do client functions
                    396: #
                    397: sub isClient {
                    398:     return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
                    399: }
1.161     foxr      400: 
                    401: 
1.156     foxr      402: #
                    403: #   ReadManagerTable: Reads in the current manager table. For now this is
                    404: #                     done on each manager authentication because:
                    405: #                     - These authentications are not frequent
                    406: #                     - This allows dynamic changes to the manager table
                    407: #                       without the need to signal to the lond.
                    408: #
                    409: sub ReadManagerTable {
                    410: 
                    411:     #   Clean out the old table first..
                    412: 
1.166     foxr      413:    foreach my $key (keys %managers) {
                    414:       delete $managers{$key};
                    415:    }
                    416: 
                    417:    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
                    418:    if (!open (MANAGERS, $tablename)) {
                    419:       logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
                    420:       return;
                    421:    }
                    422:    while(my $host = <MANAGERS>) {
                    423:       chomp($host);
                    424:       if ($host =~ "^#") {                  # Comment line.
                    425:          next;
                    426:       }
                    427:       if (!defined $hostip{$host}) { # This is a non cluster member
1.161     foxr      428: 	    #  The entry is of the form:
                    429: 	    #    cluname:hostname
                    430: 	    #  cluname - A 'cluster hostname' is needed in order to negotiate
                    431: 	    #            the host key.
                    432: 	    #  hostname- The dns name of the host.
                    433: 	    #
1.166     foxr      434:           my($cluname, $dnsname) = split(/:/, $host);
                    435:           
                    436:           my $ip = gethostbyname($dnsname);
                    437:           if(defined($ip)) {                 # bad names don't deserve entry.
                    438:             my $hostip = inet_ntoa($ip);
                    439:             $managers{$hostip} = $cluname;
                    440:             logthis('<font color="green"> registering manager '.
                    441:                     "$dnsname as $cluname with $hostip </font>\n");
                    442:          }
                    443:       } else {
                    444:          logthis('<font color="green"> existing host'." $host</font>\n");
                    445:          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
                    446:       }
                    447:    }
1.156     foxr      448: }
1.140     foxr      449: 
                    450: #
                    451: #  ValidManager: Determines if a given certificate represents a valid manager.
                    452: #                in this primitive implementation, the 'certificate' is
                    453: #                just the connecting loncapa client name.  This is checked
                    454: #                against a valid client list in the configuration.
                    455: #
                    456: #                  
                    457: sub ValidManager {
                    458:     my $certificate = shift; 
                    459: 
1.163     foxr      460:     return isManager;
1.140     foxr      461: }
                    462: #
1.143     foxr      463: #  CopyFile:  Called as part of the process of installing a 
                    464: #             new configuration file.  This function copies an existing
                    465: #             file to a backup file.
                    466: # Parameters:
                    467: #     oldfile  - Name of the file to backup.
                    468: #     newfile  - Name of the backup file.
                    469: # Return:
                    470: #     0   - Failure (errno has failure reason).
                    471: #     1   - Success.
                    472: #
                    473: sub CopyFile {
1.192     foxr      474: 
                    475:     my ($oldfile, $newfile) = @_;
1.143     foxr      476: 
1.281     matthew   477:     if (! copy($oldfile,$newfile)) {
                    478:         return 0;
1.143     foxr      479:     }
1.281     matthew   480:     chmod(0660, $newfile);
                    481:     return 1;
1.143     foxr      482: }
1.157     foxr      483: #
                    484: #  Host files are passed out with externally visible host IPs.
                    485: #  If, for example, we are behind a fire-wall or NAT host, our 
                    486: #  internally visible IP may be different than the externally
                    487: #  visible IP.  Therefore, we always adjust the contents of the
                    488: #  host file so that the entry for ME is the IP that we believe
                    489: #  we have.  At present, this is defined as the entry that
                    490: #  DNS has for us.  If by some chance we are not able to get a
                    491: #  DNS translation for us, then we assume that the host.tab file
                    492: #  is correct.  
                    493: #    BUGBUGBUG - in the future, we really should see if we can
                    494: #       easily query the interface(s) instead.
                    495: # Parameter(s):
                    496: #     contents    - The contents of the host.tab to check.
                    497: # Returns:
                    498: #     newcontents - The adjusted contents.
                    499: #
                    500: #
                    501: sub AdjustHostContents {
                    502:     my $contents  = shift;
                    503:     my $adjusted;
                    504:     my $me        = $perlvar{'lonHostID'};
                    505: 
1.354     albertel  506:     foreach my $line (split(/\n/,$contents)) {
1.157     foxr      507: 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
                    508: 	    chomp($line);
                    509: 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
                    510: 	    if ($id eq $me) {
1.354     albertel  511: 		my $ip = gethostbyname($name);
                    512: 		my $ipnew = inet_ntoa($ip);
                    513: 		$ip = $ipnew;
1.157     foxr      514: 		#  Reconstruct the host line and append to adjusted:
                    515: 		
1.354     albertel  516: 		my $newline = "$id:$domain:$role:$name:$ip";
                    517: 		if($maxcon ne "") { # Not all hosts have loncnew tuning params
                    518: 		    $newline .= ":$maxcon:$idleto:$mincon";
                    519: 		}
                    520: 		$adjusted .= $newline."\n";
1.157     foxr      521: 		
1.354     albertel  522: 	    } else {		# Not me, pass unmodified.
                    523: 		$adjusted .= $line."\n";
                    524: 	    }
1.157     foxr      525: 	} else {                  # Blank or comment never re-written.
                    526: 	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
                    527: 	}
1.354     albertel  528:     }
                    529:     return $adjusted;
1.157     foxr      530: }
1.143     foxr      531: #
                    532: #   InstallFile: Called to install an administrative file:
                    533: #       - The file is created with <name>.tmp
                    534: #       - The <name>.tmp file is then mv'd to <name>
                    535: #   This lugubrious procedure is done to ensure that we are never without
                    536: #   a valid, even if dated, version of the file regardless of who crashes
                    537: #   and when the crash occurs.
                    538: #
                    539: #  Parameters:
                    540: #       Name of the file
                    541: #       File Contents.
                    542: #  Return:
                    543: #      nonzero - success.
                    544: #      0       - failure and $! has an errno.
                    545: #
                    546: sub InstallFile {
1.192     foxr      547: 
                    548:     my ($Filename, $Contents) = @_;
1.143     foxr      549:     my $TempFile = $Filename.".tmp";
                    550: 
                    551:     #  Open the file for write:
                    552: 
                    553:     my $fh = IO::File->new("> $TempFile"); # Write to temp.
                    554:     if(!(defined $fh)) {
                    555: 	&logthis('<font color="red"> Unable to create '.$TempFile."</font>");
                    556: 	return 0;
                    557:     }
                    558:     #  write the contents of the file:
                    559: 
                    560:     print $fh ($Contents); 
                    561:     $fh->close;			# In case we ever have a filesystem w. locking
                    562: 
                    563:     chmod(0660, $TempFile);
                    564: 
                    565:     # Now we can move install the file in position.
                    566:     
                    567:     move($TempFile, $Filename);
                    568: 
                    569:     return 1;
                    570: }
1.200     matthew   571: 
                    572: 
1.169     foxr      573: #
                    574: #   ConfigFileFromSelector: converts a configuration file selector
                    575: #                 (one of host or domain at this point) into a 
                    576: #                 configuration file pathname.
                    577: #
                    578: #  Parameters:
                    579: #      selector  - Configuration file selector.
                    580: #  Returns:
                    581: #      Full path to the file or undef if the selector is invalid.
                    582: #
                    583: sub ConfigFileFromSelector {
                    584:     my $selector   = shift;
                    585:     my $tablefile;
                    586: 
                    587:     my $tabledir = $perlvar{'lonTabDir'}.'/';
                    588:     if ($selector eq "hosts") {
                    589: 	$tablefile = $tabledir."hosts.tab";
                    590:     } elsif ($selector eq "domain") {
                    591: 	$tablefile = $tabledir."domain.tab";
                    592:     } else {
                    593: 	return undef;
                    594:     }
                    595:     return $tablefile;
1.143     foxr      596: 
1.169     foxr      597: }
1.143     foxr      598: #
1.141     foxr      599: #   PushFile:  Called to do an administrative push of a file.
                    600: #              - Ensure the file being pushed is one we support.
                    601: #              - Backup the old file to <filename.saved>
                    602: #              - Separate the contents of the new file out from the
                    603: #                rest of the request.
                    604: #              - Write the new file.
                    605: #  Parameter:
                    606: #     Request - The entire user request.  This consists of a : separated
                    607: #               string pushfile:tablename:contents.
                    608: #     NOTE:  The contents may have :'s in it as well making things a bit
                    609: #            more interesting... but not much.
                    610: #  Returns:
                    611: #     String to send to client ("ok" or "refused" if bad file).
                    612: #
                    613: sub PushFile {
                    614:     my $request = shift;    
                    615:     my ($command, $filename, $contents) = split(":", $request, 3);
                    616:     
                    617:     #  At this point in time, pushes for only the following tables are
                    618:     #  supported:
                    619:     #   hosts.tab  ($filename eq host).
                    620:     #   domain.tab ($filename eq domain).
                    621:     # Construct the destination filename or reject the request.
                    622:     #
                    623:     # lonManage is supposed to ensure this, however this session could be
                    624:     # part of some elaborate spoof that managed somehow to authenticate.
                    625:     #
                    626: 
1.169     foxr      627: 
                    628:     my $tablefile = ConfigFileFromSelector($filename);
                    629:     if(! (defined $tablefile)) {
1.141     foxr      630: 	return "refused";
                    631:     }
                    632:     #
                    633:     # >copy< the old table to the backup table
                    634:     #        don't rename in case system crashes/reboots etc. in the time
                    635:     #        window between a rename and write.
                    636:     #
                    637:     my $backupfile = $tablefile;
                    638:     $backupfile    =~ s/\.tab$/.old/;
1.143     foxr      639:     if(!CopyFile($tablefile, $backupfile)) {
                    640: 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
                    641: 	return "error:$!";
                    642:     }
1.141     foxr      643:     &logthis('<font color="green"> Pushfile: backed up '
                    644: 	    .$tablefile." to $backupfile</font>");
                    645:     
1.157     foxr      646:     #  If the file being pushed is the host file, we adjust the entry for ourself so that the
                    647:     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
                    648:     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
                    649:     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
                    650:     #  that possibilty.
                    651: 
                    652:     if($filename eq "host") {
                    653: 	$contents = AdjustHostContents($contents);
                    654:     }
                    655: 
1.141     foxr      656:     #  Install the new file:
                    657: 
1.143     foxr      658:     if(!InstallFile($tablefile, $contents)) {
                    659: 	&logthis('<font color="red"> Pushfile: unable to install '
1.145     foxr      660: 	 .$tablefile." $! </font>");
1.143     foxr      661: 	return "error:$!";
1.224     foxr      662:     } else {
1.143     foxr      663: 	&logthis('<font color="green"> Installed new '.$tablefile
                    664: 		 ."</font>");
                    665: 
                    666:     }
                    667: 
1.141     foxr      668: 
                    669:     #  Indicate success:
                    670:  
                    671:     return "ok";
                    672: 
                    673: }
1.145     foxr      674: 
                    675: #
                    676: #  Called to re-init either lonc or lond.
                    677: #
                    678: #  Parameters:
                    679: #    request   - The full request by the client.  This is of the form
                    680: #                reinit:<process>  
                    681: #                where <process> is allowed to be either of 
                    682: #                lonc or lond
                    683: #
                    684: #  Returns:
                    685: #     The string to be sent back to the client either:
                    686: #   ok         - Everything worked just fine.
                    687: #   error:why  - There was a failure and why describes the reason.
                    688: #
                    689: #
                    690: sub ReinitProcess {
                    691:     my $request = shift;
                    692: 
1.146     foxr      693: 
                    694:     # separate the request (reinit) from the process identifier and
                    695:     # validate it producing the name of the .pid file for the process.
                    696:     #
                    697:     #
                    698:     my ($junk, $process) = split(":", $request);
1.147     foxr      699:     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146     foxr      700:     if($process eq 'lonc') {
                    701: 	$processpidfile = $processpidfile."lonc.pid";
1.147     foxr      702: 	if (!open(PIDFILE, "< $processpidfile")) {
                    703: 	    return "error:Open failed for $processpidfile";
                    704: 	}
                    705: 	my $loncpid = <PIDFILE>;
                    706: 	close(PIDFILE);
                    707: 	logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
                    708: 		."</font>");
                    709: 	kill("USR2", $loncpid);
1.146     foxr      710:     } elsif ($process eq 'lond') {
1.147     foxr      711: 	logthis('<font color="red"> Reinitializing self (lond) </font>');
                    712: 	&UpdateHosts;			# Lond is us!!
1.146     foxr      713:     } else {
                    714: 	&logthis('<font color="yellow" Invalid reinit request for '.$process
                    715: 		 ."</font>");
                    716: 	return "error:Invalid process identifier $process";
                    717:     }
1.145     foxr      718:     return 'ok';
                    719: }
1.168     foxr      720: #   Validate a line in a configuration file edit script:
                    721: #   Validation includes:
                    722: #     - Ensuring the command is valid.
                    723: #     - Ensuring the command has sufficient parameters
                    724: #   Parameters:
                    725: #     scriptline - A line to validate (\n has been stripped for what it's worth).
1.167     foxr      726: #
1.168     foxr      727: #   Return:
                    728: #      0     - Invalid scriptline.
                    729: #      1     - Valid scriptline
                    730: #  NOTE:
                    731: #     Only the command syntax is checked, not the executability of the
                    732: #     command.
                    733: #
                    734: sub isValidEditCommand {
                    735:     my $scriptline = shift;
                    736: 
                    737:     #   Line elements are pipe separated:
                    738: 
                    739:     my ($command, $key, $newline)  = split(/\|/, $scriptline);
                    740:     &logthis('<font color="green"> isValideditCommand checking: '.
                    741: 	     "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
                    742:     
                    743:     if ($command eq "delete") {
                    744: 	#
                    745: 	#   key with no newline.
                    746: 	#
                    747: 	if( ($key eq "") || ($newline ne "")) {
                    748: 	    return 0;		# Must have key but no newline.
                    749: 	} else {
                    750: 	    return 1;		# Valid syntax.
                    751: 	}
1.169     foxr      752:     } elsif ($command eq "replace") {
1.168     foxr      753: 	#
                    754: 	#   key and newline:
                    755: 	#
                    756: 	if (($key eq "") || ($newline eq "")) {
                    757: 	    return 0;
                    758: 	} else {
                    759: 	    return 1;
                    760: 	}
1.169     foxr      761:     } elsif ($command eq "append") {
                    762: 	if (($key ne "") && ($newline eq "")) {
                    763: 	    return 1;
                    764: 	} else {
                    765: 	    return 0;
                    766: 	}
1.168     foxr      767:     } else {
                    768: 	return 0;		# Invalid command.
                    769:     }
                    770:     return 0;			# Should not get here!!!
                    771: }
1.169     foxr      772: #
                    773: #   ApplyEdit - Applies an edit command to a line in a configuration 
                    774: #               file.  It is the caller's responsiblity to validate the
                    775: #               edit line.
                    776: #   Parameters:
                    777: #      $directive - A single edit directive to apply.  
                    778: #                   Edit directives are of the form:
                    779: #                  append|newline      - Appends a new line to the file.
                    780: #                  replace|key|newline - Replaces the line with key value 'key'
                    781: #                  delete|key          - Deletes the line with key value 'key'.
                    782: #      $editor   - A config file editor object that contains the
                    783: #                  file being edited.
                    784: #
                    785: sub ApplyEdit {
1.192     foxr      786: 
                    787:     my ($directive, $editor) = @_;
1.169     foxr      788: 
                    789:     # Break the directive down into its command and its parameters
                    790:     # (at most two at this point.  The meaning of the parameters, if in fact
                    791:     #  they exist depends on the command).
                    792: 
                    793:     my ($command, $p1, $p2) = split(/\|/, $directive);
                    794: 
                    795:     if($command eq "append") {
                    796: 	$editor->Append($p1);	          # p1 - key p2 null.
                    797:     } elsif ($command eq "replace") {
                    798: 	$editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.
                    799:     } elsif ($command eq "delete") {
                    800: 	$editor->DeleteLine($p1);         # p1 - key p2 null.
                    801:     } else {			          # Should not get here!!!
                    802: 	die "Invalid command given to ApplyEdit $command"
                    803:     }
                    804: }
                    805: #
                    806: # AdjustOurHost:
                    807: #           Adjusts a host file stored in a configuration file editor object
                    808: #           for the true IP address of this host. This is necessary for hosts
                    809: #           that live behind a firewall.
                    810: #           Those hosts have a publicly distributed IP of the firewall, but
                    811: #           internally must use their actual IP.  We assume that a given
                    812: #           host only has a single IP interface for now.
                    813: # Formal Parameters:
                    814: #     editor   - The configuration file editor to adjust.  This
                    815: #                editor is assumed to contain a hosts.tab file.
                    816: # Strategy:
                    817: #    - Figure out our hostname.
                    818: #    - Lookup the entry for this host.
                    819: #    - Modify the line to contain our IP
                    820: #    - Do a replace for this host.
                    821: sub AdjustOurHost {
                    822:     my $editor        = shift;
                    823: 
                    824:     # figure out who I am.
                    825: 
                    826:     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.
                    827: 
                    828:     #  Get my host file entry.
                    829: 
                    830:     my $ConfigLine    = $editor->Find($myHostName);
                    831:     if(! (defined $ConfigLine)) {
                    832: 	die "AdjustOurHost - no entry for me in hosts file $myHostName";
                    833:     }
                    834:     # figure out my IP:
                    835:     #   Use the config line to get my hostname.
                    836:     #   Use gethostbyname to translate that into an IP address.
                    837:     #
1.338     albertel  838:     my ($id,$domain,$role,$name,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
1.169     foxr      839:     #
                    840:     #  Reassemble the config line from the elements in the list.
                    841:     #  Note that if the loncnew items were not present before, they will
                    842:     #  be now even if they would be empty
                    843:     #
                    844:     my $newConfigLine = $id;
1.338     albertel  845:     foreach my $item ($domain, $role, $name, $maxcon, $idleto, $mincon) {
1.169     foxr      846: 	$newConfigLine .= ":".$item;
                    847:     }
                    848:     #  Replace the line:
                    849: 
                    850:     $editor->ReplaceLine($id, $newConfigLine);
                    851:     
                    852: }
                    853: #
                    854: #   ReplaceConfigFile:
                    855: #              Replaces a configuration file with the contents of a
                    856: #              configuration file editor object.
                    857: #              This is done by:
                    858: #              - Copying the target file to <filename>.old
                    859: #              - Writing the new file to <filename>.tmp
                    860: #              - Moving <filename.tmp>  -> <filename>
                    861: #              This laborious process ensures that the system is never without
                    862: #              a configuration file that's at least valid (even if the contents
                    863: #              may be dated).
                    864: #   Parameters:
                    865: #        filename   - Name of the file to modify... this is a full path.
                    866: #        editor     - Editor containing the file.
                    867: #
                    868: sub ReplaceConfigFile {
1.192     foxr      869:     
                    870:     my ($filename, $editor) = @_;
1.168     foxr      871: 
1.169     foxr      872:     CopyFile ($filename, $filename.".old");
                    873: 
                    874:     my $contents  = $editor->Get(); # Get the contents of the file.
                    875: 
                    876:     InstallFile($filename, $contents);
                    877: }
1.168     foxr      878: #   
                    879: #
                    880: #   Called to edit a configuration table  file
1.167     foxr      881: #   Parameters:
                    882: #      request           - The entire command/request sent by lonc or lonManage
                    883: #   Return:
                    884: #      The reply to send to the client.
1.168     foxr      885: #
1.167     foxr      886: sub EditFile {
                    887:     my $request = shift;
                    888: 
                    889:     #  Split the command into it's pieces:  edit:filetype:script
                    890: 
1.339     albertel  891:     my ($cmd, $filetype, $script) = split(/:/, $request,3);	# : in script
1.167     foxr      892: 
                    893:     #  Check the pre-coditions for success:
                    894: 
1.339     albertel  895:     if($cmd != "edit") {	# Something is amiss afoot alack.
1.167     foxr      896: 	return "error:edit request detected, but request != 'edit'\n";
                    897:     }
                    898:     if( ($filetype ne "hosts")  &&
                    899: 	($filetype ne "domain")) {
                    900: 	return "error:edit requested with invalid file specifier: $filetype \n";
                    901:     }
                    902: 
                    903:     #   Split the edit script and check it's validity.
1.168     foxr      904: 
                    905:     my @scriptlines = split(/\n/, $script);  # one line per element.
                    906:     my $linecount   = scalar(@scriptlines);
                    907:     for(my $i = 0; $i < $linecount; $i++) {
                    908: 	chomp($scriptlines[$i]);
                    909: 	if(!isValidEditCommand($scriptlines[$i])) {
                    910: 	    return "error:edit with bad script line: '$scriptlines[$i]' \n";
                    911: 	}
                    912:     }
1.145     foxr      913: 
1.167     foxr      914:     #   Execute the edit operation.
1.169     foxr      915:     #   - Create a config file editor for the appropriate file and 
                    916:     #   - execute each command in the script:
                    917:     #
                    918:     my $configfile = ConfigFileFromSelector($filetype);
                    919:     if (!(defined $configfile)) {
                    920: 	return "refused\n";
                    921:     }
                    922:     my $editor = ConfigFileEdit->new($configfile);
1.167     foxr      923: 
1.169     foxr      924:     for (my $i = 0; $i < $linecount; $i++) {
                    925: 	ApplyEdit($scriptlines[$i], $editor);
                    926:     }
                    927:     # If the file is the host file, ensure that our host is
                    928:     # adjusted to have our ip:
                    929:     #
                    930:     if($filetype eq "host") {
                    931: 	AdjustOurHost($editor);
                    932:     }
                    933:     #  Finally replace the current file with our file.
                    934:     #
                    935:     ReplaceConfigFile($configfile, $editor);
1.167     foxr      936: 
                    937:     return "ok\n";
                    938: }
1.207     foxr      939: 
1.255     foxr      940: #   read_profile
                    941: #
                    942: #   Returns a set of specific entries from a user's profile file.
                    943: #   this is a utility function that is used by both get_profile_entry and
                    944: #   get_profile_entry_encrypted.
                    945: #
                    946: # Parameters:
                    947: #    udom       - Domain in which the user exists.
                    948: #    uname      - User's account name (loncapa account)
                    949: #    namespace  - The profile namespace to open.
                    950: #    what       - A set of & separated queries.
                    951: # Returns:
                    952: #    If all ok: - The string that needs to be shipped back to the user.
                    953: #    If failure - A string that starts with error: followed by the failure
                    954: #                 reason.. note that this probabyl gets shipped back to the
                    955: #                 user as well.
                    956: #
                    957: sub read_profile {
                    958:     my ($udom, $uname, $namespace, $what) = @_;
                    959:     
                    960:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                    961: 				 &GDBM_READER());
                    962:     if ($hashref) {
                    963:         my @queries=split(/\&/,$what);
                    964:         my $qresult='';
                    965: 	
                    966: 	for (my $i=0;$i<=$#queries;$i++) {
                    967: 	    $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
                    968: 	}
                    969: 	$qresult=~s/\&$//;              # Remove trailing & from last lookup.
1.311     albertel  970: 	if (&untie_user_hash($hashref)) {
1.255     foxr      971: 	    return $qresult;
                    972: 	} else {
                    973: 	    return "error: ".($!+0)." untie (GDBM) Failed";
                    974: 	}
                    975:     } else {
                    976: 	if ($!+0 == 2) {
                    977: 	    return "error:No such file or GDBM reported bad block error";
                    978: 	} else {
                    979: 	    return "error: ".($!+0)." tie (GDBM) Failed";
                    980: 	}
                    981:     }
                    982: 
                    983: }
1.214     foxr      984: #--------------------- Request Handlers --------------------------------------------
                    985: #
1.215     foxr      986: #   By convention each request handler registers itself prior to the sub 
                    987: #   declaration:
1.214     foxr      988: #
                    989: 
1.216     foxr      990: #++
                    991: #
1.214     foxr      992: #  Handles ping requests.
                    993: #  Parameters:
                    994: #      $cmd    - the actual keyword that invoked us.
                    995: #      $tail   - the tail of the request that invoked us.
                    996: #      $replyfd- File descriptor connected to the client
                    997: #  Implicit Inputs:
                    998: #      $currenthostid - Global variable that carries the name of the host we are
                    999: #                       known as.
                   1000: #  Returns:
                   1001: #      1       - Ok to continue processing.
                   1002: #      0       - Program should exit.
                   1003: #  Side effects:
                   1004: #      Reply information is sent to the client.
                   1005: sub ping_handler {
                   1006:     my ($cmd, $tail, $client) = @_;
                   1007:     Debug("$cmd $tail $client .. $currenthostid:");
                   1008:    
                   1009:     Reply( $client,"$currenthostid\n","$cmd:$tail");
                   1010:    
                   1011:     return 1;
                   1012: }
                   1013: &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
                   1014: 
1.216     foxr     1015: #++
1.215     foxr     1016: #
                   1017: # Handles pong requests.  Pong replies with our current host id, and
                   1018: #                         the results of a ping sent to us via our lonc.
                   1019: #
                   1020: # Parameters:
                   1021: #      $cmd    - the actual keyword that invoked us.
                   1022: #      $tail   - the tail of the request that invoked us.
                   1023: #      $replyfd- File descriptor connected to the client
                   1024: #  Implicit Inputs:
                   1025: #      $currenthostid - Global variable that carries the name of the host we are
                   1026: #                       connected to.
                   1027: #  Returns:
                   1028: #      1       - Ok to continue processing.
                   1029: #      0       - Program should exit.
                   1030: #  Side effects:
                   1031: #      Reply information is sent to the client.
                   1032: sub pong_handler {
                   1033:     my ($cmd, $tail, $replyfd) = @_;
                   1034: 
                   1035:     my $reply=&reply("ping",$clientname);
                   1036:     &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
                   1037:     return 1;
                   1038: }
                   1039: &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
                   1040: 
1.216     foxr     1041: #++
                   1042: #      Called to establish an encrypted session key with the remote client.
                   1043: #      Note that with secure lond, in most cases this function is never
                   1044: #      invoked.  Instead, the secure session key is established either
                   1045: #      via a local file that's locked down tight and only lives for a short
                   1046: #      time, or via an ssl tunnel...and is generated from a bunch-o-random
                   1047: #      bits from /dev/urandom, rather than the predictable pattern used by
                   1048: #      by this sub.  This sub is only used in the old-style insecure
                   1049: #      key negotiation.
                   1050: # Parameters:
                   1051: #      $cmd    - the actual keyword that invoked us.
                   1052: #      $tail   - the tail of the request that invoked us.
                   1053: #      $replyfd- File descriptor connected to the client
                   1054: #  Implicit Inputs:
                   1055: #      $currenthostid - Global variable that carries the name of the host
                   1056: #                       known as.
                   1057: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
                   1058: #  Returns:
                   1059: #      1       - Ok to continue processing.
                   1060: #      0       - Program should exit.
                   1061: #  Implicit Outputs:
                   1062: #      Reply information is sent to the client.
                   1063: #      $cipher is set with a reference to a new IDEA encryption object.
                   1064: #
                   1065: sub establish_key_handler {
                   1066:     my ($cmd, $tail, $replyfd) = @_;
                   1067: 
                   1068:     my $buildkey=time.$$.int(rand 100000);
                   1069:     $buildkey=~tr/1-6/A-F/;
                   1070:     $buildkey=int(rand 100000).$buildkey.int(rand 100000);
                   1071:     my $key=$currenthostid.$clientname;
                   1072:     $key=~tr/a-z/A-Z/;
                   1073:     $key=~tr/G-P/0-9/;
                   1074:     $key=~tr/Q-Z/0-9/;
                   1075:     $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
                   1076:     $key=substr($key,0,32);
                   1077:     my $cipherkey=pack("H32",$key);
                   1078:     $cipher=new IDEA $cipherkey;
                   1079:     &Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 
                   1080:    
                   1081:     return 1;
                   1082: 
                   1083: }
                   1084: &register_handler("ekey", \&establish_key_handler, 0, 1,1);
                   1085: 
1.217     foxr     1086: #     Handler for the load command.  Returns the current system load average
                   1087: #     to the requestor.
                   1088: #
                   1089: # Parameters:
                   1090: #      $cmd    - the actual keyword that invoked us.
                   1091: #      $tail   - the tail of the request that invoked us.
                   1092: #      $replyfd- File descriptor connected to the client
                   1093: #  Implicit Inputs:
                   1094: #      $currenthostid - Global variable that carries the name of the host
                   1095: #                       known as.
                   1096: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
                   1097: #  Returns:
                   1098: #      1       - Ok to continue processing.
                   1099: #      0       - Program should exit.
                   1100: #  Side effects:
                   1101: #      Reply information is sent to the client.
                   1102: sub load_handler {
                   1103:     my ($cmd, $tail, $replyfd) = @_;
                   1104: 
                   1105:    # Get the load average from /proc/loadavg and calculate it as a percentage of
                   1106:    # the allowed load limit as set by the perl global variable lonLoadLim
                   1107: 
                   1108:     my $loadavg;
                   1109:     my $loadfile=IO::File->new('/proc/loadavg');
                   1110:    
                   1111:     $loadavg=<$loadfile>;
                   1112:     $loadavg =~ s/\s.*//g;                      # Extract the first field only.
                   1113:    
                   1114:     my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
                   1115: 
                   1116:     &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
                   1117:    
                   1118:     return 1;
                   1119: }
1.263     albertel 1120: &register_handler("load", \&load_handler, 0, 1, 0);
1.217     foxr     1121: 
                   1122: #
                   1123: #   Process the userload request.  This sub returns to the client the current
                   1124: #  user load average.  It can be invoked either by clients or managers.
                   1125: #
                   1126: # Parameters:
                   1127: #      $cmd    - the actual keyword that invoked us.
                   1128: #      $tail   - the tail of the request that invoked us.
                   1129: #      $replyfd- File descriptor connected to the client
                   1130: #  Implicit Inputs:
                   1131: #      $currenthostid - Global variable that carries the name of the host
                   1132: #                       known as.
                   1133: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
                   1134: #  Returns:
                   1135: #      1       - Ok to continue processing.
                   1136: #      0       - Program should exit
                   1137: # Implicit inputs:
                   1138: #     whatever the userload() function requires.
                   1139: #  Implicit outputs:
                   1140: #     the reply is written to the client.
                   1141: #
                   1142: sub user_load_handler {
                   1143:     my ($cmd, $tail, $replyfd) = @_;
                   1144: 
                   1145:     my $userloadpercent=&userload();
                   1146:     &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
                   1147:     
                   1148:     return 1;
                   1149: }
1.263     albertel 1150: &register_handler("userload", \&user_load_handler, 0, 1, 0);
1.217     foxr     1151: 
1.218     foxr     1152: #   Process a request for the authorization type of a user:
                   1153: #   (userauth).
                   1154: #
                   1155: # Parameters:
                   1156: #      $cmd    - the actual keyword that invoked us.
                   1157: #      $tail   - the tail of the request that invoked us.
                   1158: #      $replyfd- File descriptor connected to the client
                   1159: #  Returns:
                   1160: #      1       - Ok to continue processing.
                   1161: #      0       - Program should exit
                   1162: # Implicit outputs:
                   1163: #    The user authorization type is written to the client.
                   1164: #
                   1165: sub user_authorization_type {
                   1166:     my ($cmd, $tail, $replyfd) = @_;
                   1167:    
                   1168:     my $userinput = "$cmd:$tail";
                   1169:    
                   1170:     #  Pull the domain and username out of the command tail.
1.222     foxr     1171:     # and call get_auth_type to determine the authentication type.
1.218     foxr     1172:    
                   1173:     my ($udom,$uname)=split(/:/,$tail);
1.222     foxr     1174:     my $result = &get_auth_type($udom, $uname);
1.218     foxr     1175:     if($result eq "nouser") {
                   1176: 	&Failure( $replyfd, "unknown_user\n", $userinput);
                   1177:     } else {
                   1178: 	#
1.222     foxr     1179: 	# We only want to pass the second field from get_auth_type
1.218     foxr     1180: 	# for ^krb.. otherwise we'll be handing out the encrypted
                   1181: 	# password for internals e.g.
                   1182: 	#
                   1183: 	my ($type,$otherinfo) = split(/:/,$result);
                   1184: 	if($type =~ /^krb/) {
                   1185: 	    $type = $result;
1.269     raeburn  1186: 	} else {
                   1187:             $type .= ':';
                   1188:         }
                   1189: 	&Reply( $replyfd, "$type\n", $userinput);
1.218     foxr     1190:     }
                   1191:   
                   1192:     return 1;
                   1193: }
                   1194: &register_handler("currentauth", \&user_authorization_type, 1, 1, 0);
                   1195: 
                   1196: #   Process a request by a manager to push a hosts or domain table 
                   1197: #   to us.  We pick apart the command and pass it on to the subs
                   1198: #   that already exist to do this.
                   1199: #
                   1200: # Parameters:
                   1201: #      $cmd    - the actual keyword that invoked us.
                   1202: #      $tail   - the tail of the request that invoked us.
                   1203: #      $client - File descriptor connected to the client
                   1204: #  Returns:
                   1205: #      1       - Ok to continue processing.
                   1206: #      0       - Program should exit
                   1207: # Implicit Output:
                   1208: #    a reply is written to the client.
                   1209: sub push_file_handler {
                   1210:     my ($cmd, $tail, $client) = @_;
                   1211: 
                   1212:     my $userinput = "$cmd:$tail";
                   1213: 
                   1214:     # At this time we only know that the IP of our partner is a valid manager
                   1215:     # the code below is a hook to do further authentication (e.g. to resolve
                   1216:     # spoofing).
                   1217: 
                   1218:     my $cert = &GetCertificate($userinput);
                   1219:     if(&ValidManager($cert)) { 
                   1220: 
                   1221: 	# Now presumably we have the bona fides of both the peer host and the
                   1222: 	# process making the request.
                   1223:       
                   1224: 	my $reply = &PushFile($userinput);
                   1225: 	&Reply($client, "$reply\n", $userinput);
                   1226: 
                   1227:     } else {
                   1228: 	&Failure( $client, "refused\n", $userinput);
                   1229:     } 
1.219     foxr     1230:     return 1;
1.218     foxr     1231: }
                   1232: &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
                   1233: 
1.243     banghart 1234: #
                   1235: #   du  - list the disk usuage of a directory recursively. 
                   1236: #    
                   1237: #   note: stolen code from the ls file handler
                   1238: #   under construction by Rick Banghart 
                   1239: #    .
                   1240: # Parameters:
                   1241: #    $cmd        - The command that dispatched us (du).
                   1242: #    $ududir     - The directory path to list... I'm not sure what this
                   1243: #                  is relative as things like ls:. return e.g.
                   1244: #                  no_such_dir.
                   1245: #    $client     - Socket open on the client.
                   1246: # Returns:
                   1247: #     1 - indicating that the daemon should not disconnect.
                   1248: # Side Effects:
                   1249: #   The reply is written to  $client.
                   1250: #
                   1251: sub du_handler {
                   1252:     my ($cmd, $ududir, $client) = @_;
1.339     albertel 1253:     ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
1.251     foxr     1254:     my $userinput = "$cmd:$ududir";
                   1255: 
1.245     albertel 1256:     if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
                   1257: 	&Failure($client,"refused\n","$cmd:$ududir");
                   1258: 	return 1;
                   1259:     }
1.249     foxr     1260:     #  Since $ududir could have some nasties in it,
                   1261:     #  we will require that ududir is a valid
                   1262:     #  directory.  Just in case someone tries to
                   1263:     #  slip us a  line like .;(cd /home/httpd rm -rf*)
                   1264:     #  etc.
                   1265:     #
                   1266:     if (-d $ududir) {
1.292     albertel 1267: 	my $total_size=0;
                   1268: 	my $code=sub { 
                   1269: 	    if ($_=~/\.\d+\./) { return;} 
                   1270: 	    if ($_=~/\.meta$/) { return;}
                   1271: 	    $total_size+=(stat($_))[7];
                   1272: 	};
1.295     raeburn  1273: 	chdir($ududir);
1.292     albertel 1274: 	find($code,$ududir);
                   1275: 	$total_size=int($total_size/1024);
                   1276: 	&Reply($client,"$total_size\n","$cmd:$ududir");
1.249     foxr     1277:     } else {
1.251     foxr     1278: 	&Failure($client, "bad_directory:$ududir\n","$cmd:$ududir"); 
1.249     foxr     1279:     }
1.243     banghart 1280:     return 1;
                   1281: }
                   1282: &register_handler("du", \&du_handler, 0, 1, 0);
1.218     foxr     1283: 
1.239     foxr     1284: #
1.280     matthew  1285: # The ls_handler routine should be considered obosolete and is retained
                   1286: # for communication with legacy servers.  Please see the ls2_handler.
                   1287: #
1.239     foxr     1288: #   ls  - list the contents of a directory.  For each file in the
                   1289: #    selected directory the filename followed by the full output of
                   1290: #    the stat function is returned.  The returned info for each
                   1291: #    file are separated by ':'.  The stat fields are separated by &'s.
                   1292: # Parameters:
                   1293: #    $cmd        - The command that dispatched us (ls).
                   1294: #    $ulsdir     - The directory path to list... I'm not sure what this
                   1295: #                  is relative as things like ls:. return e.g.
                   1296: #                  no_such_dir.
                   1297: #    $client     - Socket open on the client.
                   1298: # Returns:
                   1299: #     1 - indicating that the daemon should not disconnect.
                   1300: # Side Effects:
                   1301: #   The reply is written to  $client.
                   1302: #
                   1303: sub ls_handler {
1.280     matthew  1304:     # obsoleted by ls2_handler
1.239     foxr     1305:     my ($cmd, $ulsdir, $client) = @_;
                   1306: 
                   1307:     my $userinput = "$cmd:$ulsdir";
                   1308: 
                   1309:     my $obs;
                   1310:     my $rights;
                   1311:     my $ulsout='';
                   1312:     my $ulsfn;
                   1313:     if (-e $ulsdir) {
                   1314: 	if(-d $ulsdir) {
                   1315: 	    if (opendir(LSDIR,$ulsdir)) {
                   1316: 		while ($ulsfn=readdir(LSDIR)) {
1.291     albertel 1317: 		    undef($obs);
                   1318: 		    undef($rights); 
1.239     foxr     1319: 		    my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   1320: 		    #We do some obsolete checking here
                   1321: 		    if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                   1322: 			open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                   1323: 			my @obsolete=<FILE>;
                   1324: 			foreach my $obsolete (@obsolete) {
1.301     www      1325: 			    if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
1.239     foxr     1326: 			    if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
                   1327: 			}
                   1328: 		    }
                   1329: 		    $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
                   1330: 		    if($obs eq '1') { $ulsout.="&1"; }
                   1331: 		    else { $ulsout.="&0"; }
                   1332: 		    if($rights eq '1') { $ulsout.="&1:"; }
                   1333: 		    else { $ulsout.="&0:"; }
                   1334: 		}
                   1335: 		closedir(LSDIR);
                   1336: 	    }
                   1337: 	} else {
                   1338: 	    my @ulsstats=stat($ulsdir);
                   1339: 	    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   1340: 	}
                   1341:     } else {
                   1342: 	$ulsout='no_such_dir';
                   1343:     }
                   1344:     if ($ulsout eq '') { $ulsout='empty'; }
1.249     foxr     1345:     &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1.239     foxr     1346:     
                   1347:     return 1;
                   1348: 
                   1349: }
                   1350: &register_handler("ls", \&ls_handler, 0, 1, 0);
                   1351: 
1.280     matthew  1352: #
                   1353: # Please also see the ls_handler, which this routine obosolets.
                   1354: # ls2_handler differs from ls_handler in that it escapes its return 
                   1355: # values before concatenating them together with ':'s.
                   1356: #
                   1357: #   ls2  - list the contents of a directory.  For each file in the
                   1358: #    selected directory the filename followed by the full output of
                   1359: #    the stat function is returned.  The returned info for each
                   1360: #    file are separated by ':'.  The stat fields are separated by &'s.
                   1361: # Parameters:
                   1362: #    $cmd        - The command that dispatched us (ls).
                   1363: #    $ulsdir     - The directory path to list... I'm not sure what this
                   1364: #                  is relative as things like ls:. return e.g.
                   1365: #                  no_such_dir.
                   1366: #    $client     - Socket open on the client.
                   1367: # Returns:
                   1368: #     1 - indicating that the daemon should not disconnect.
                   1369: # Side Effects:
                   1370: #   The reply is written to  $client.
                   1371: #
                   1372: sub ls2_handler {
                   1373:     my ($cmd, $ulsdir, $client) = @_;
                   1374: 
                   1375:     my $userinput = "$cmd:$ulsdir";
                   1376: 
                   1377:     my $obs;
                   1378:     my $rights;
                   1379:     my $ulsout='';
                   1380:     my $ulsfn;
                   1381:     if (-e $ulsdir) {
                   1382:         if(-d $ulsdir) {
                   1383:             if (opendir(LSDIR,$ulsdir)) {
                   1384:                 while ($ulsfn=readdir(LSDIR)) {
1.291     albertel 1385:                     undef($obs);
                   1386: 		    undef($rights); 
1.280     matthew  1387:                     my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   1388:                     #We do some obsolete checking here
                   1389:                     if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                   1390:                         open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                   1391:                         my @obsolete=<FILE>;
                   1392:                         foreach my $obsolete (@obsolete) {
1.301     www      1393:                             if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
1.280     matthew  1394:                             if($obsolete =~ m|(<copyright>)(default)|) {
                   1395:                                 $rights = 1;
                   1396:                             }
                   1397:                         }
                   1398:                     }
                   1399:                     my $tmp = $ulsfn.'&'.join('&',@ulsstats);
                   1400:                     if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                   1401:                     if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                   1402:                     $ulsout.= &escape($tmp).':';
                   1403:                 }
                   1404:                 closedir(LSDIR);
                   1405:             }
                   1406:         } else {
                   1407:             my @ulsstats=stat($ulsdir);
                   1408:             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   1409:         }
                   1410:     } else {
                   1411:         $ulsout='no_such_dir';
                   1412:    }
                   1413:    if ($ulsout eq '') { $ulsout='empty'; }
                   1414:    &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
                   1415:    return 1;
                   1416: }
                   1417: &register_handler("ls2", \&ls2_handler, 0, 1, 0);
                   1418: 
1.218     foxr     1419: #   Process a reinit request.  Reinit requests that either
                   1420: #   lonc or lond be reinitialized so that an updated 
                   1421: #   host.tab or domain.tab can be processed.
                   1422: #
                   1423: # Parameters:
                   1424: #      $cmd    - the actual keyword that invoked us.
                   1425: #      $tail   - the tail of the request that invoked us.
                   1426: #      $client - File descriptor connected to the client
                   1427: #  Returns:
                   1428: #      1       - Ok to continue processing.
                   1429: #      0       - Program should exit
                   1430: #  Implicit output:
                   1431: #     a reply is sent to the client.
                   1432: #
                   1433: sub reinit_process_handler {
                   1434:     my ($cmd, $tail, $client) = @_;
                   1435:    
                   1436:     my $userinput = "$cmd:$tail";
                   1437:    
                   1438:     my $cert = &GetCertificate($userinput);
                   1439:     if(&ValidManager($cert)) {
                   1440: 	chomp($userinput);
                   1441: 	my $reply = &ReinitProcess($userinput);
                   1442: 	&Reply( $client,  "$reply\n", $userinput);
                   1443:     } else {
                   1444: 	&Failure( $client, "refused\n", $userinput);
                   1445:     }
                   1446:     return 1;
                   1447: }
                   1448: &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
                   1449: 
                   1450: #  Process the editing script for a table edit operation.
                   1451: #  the editing operation must be encrypted and requested by
                   1452: #  a manager host.
                   1453: #
                   1454: # Parameters:
                   1455: #      $cmd    - the actual keyword that invoked us.
                   1456: #      $tail   - the tail of the request that invoked us.
                   1457: #      $client - File descriptor connected to the client
                   1458: #  Returns:
                   1459: #      1       - Ok to continue processing.
                   1460: #      0       - Program should exit
                   1461: #  Implicit output:
                   1462: #     a reply is sent to the client.
                   1463: #
                   1464: sub edit_table_handler {
                   1465:     my ($command, $tail, $client) = @_;
                   1466:    
                   1467:     my $userinput = "$command:$tail";
                   1468: 
                   1469:     my $cert = &GetCertificate($userinput);
                   1470:     if(&ValidManager($cert)) {
                   1471: 	my($filetype, $script) = split(/:/, $tail);
                   1472: 	if (($filetype eq "hosts") || 
                   1473: 	    ($filetype eq "domain")) {
                   1474: 	    if($script ne "") {
                   1475: 		&Reply($client,              # BUGBUG - EditFile
                   1476: 		      &EditFile($userinput), #   could fail.
                   1477: 		      $userinput);
                   1478: 	    } else {
                   1479: 		&Failure($client,"refused\n",$userinput);
                   1480: 	    }
                   1481: 	} else {
                   1482: 	    &Failure($client,"refused\n",$userinput);
                   1483: 	}
                   1484:     } else {
                   1485: 	&Failure($client,"refused\n",$userinput);
                   1486:     }
                   1487:     return 1;
                   1488: }
1.263     albertel 1489: &register_handler("edit", \&edit_table_handler, 1, 0, 1);
1.218     foxr     1490: 
1.220     foxr     1491: #
                   1492: #   Authenticate a user against the LonCAPA authentication
                   1493: #   database.  Note that there are several authentication
                   1494: #   possibilities:
                   1495: #   - unix     - The user can be authenticated against the unix
                   1496: #                password file.
                   1497: #   - internal - The user can be authenticated against a purely 
                   1498: #                internal per user password file.
                   1499: #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
                   1500: #                ticket granting authority.
                   1501: #   - user     - The person tailoring LonCAPA can supply a user authentication
                   1502: #                mechanism that is per system.
                   1503: #
                   1504: # Parameters:
                   1505: #    $cmd      - The command that got us here.
                   1506: #    $tail     - Tail of the command (remaining parameters).
                   1507: #    $client   - File descriptor connected to client.
                   1508: # Returns
                   1509: #     0        - Requested to exit, caller should shut down.
                   1510: #     1        - Continue processing.
                   1511: # Implicit inputs:
                   1512: #    The authentication systems describe above have their own forms of implicit
                   1513: #    input into the authentication process that are described above.
                   1514: #
                   1515: sub authenticate_handler {
                   1516:     my ($cmd, $tail, $client) = @_;
                   1517: 
                   1518:     
                   1519:     #  Regenerate the full input line 
                   1520:     
                   1521:     my $userinput  = $cmd.":".$tail;
                   1522:     
                   1523:     #  udom    - User's domain.
                   1524:     #  uname   - Username.
                   1525:     #  upass   - User's password.
                   1526:     
                   1527:     my ($udom,$uname,$upass)=split(/:/,$tail);
                   1528:     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
                   1529:     chomp($upass);
                   1530:     $upass=&unescape($upass);
                   1531: 
                   1532:     my $pwdcorrect = &validate_user($udom, $uname, $upass);
                   1533:     if($pwdcorrect) {
                   1534: 	&Reply( $client, "authorized\n", $userinput);
                   1535: 	#
                   1536: 	#  Bad credentials: Failed to authorize
                   1537: 	#
                   1538:     } else {
                   1539: 	&Failure( $client, "non_authorized\n", $userinput);
                   1540:     }
                   1541: 
                   1542:     return 1;
                   1543: }
1.263     albertel 1544: &register_handler("auth", \&authenticate_handler, 1, 1, 0);
1.214     foxr     1545: 
1.222     foxr     1546: #
                   1547: #   Change a user's password.  Note that this function is complicated by
                   1548: #   the fact that a user may be authenticated in more than one way:
                   1549: #   At present, we are not able to change the password for all types of
                   1550: #   authentication methods.  Only for:
                   1551: #      unix    - unix password or shadow passoword style authentication.
                   1552: #      local   - Locally written authentication mechanism.
                   1553: #   For now, kerb4 and kerb5 password changes are not supported and result
                   1554: #   in an error.
                   1555: # FUTURE WORK:
                   1556: #    Support kerberos passwd changes?
                   1557: # Parameters:
                   1558: #    $cmd      - The command that got us here.
                   1559: #    $tail     - Tail of the command (remaining parameters).
                   1560: #    $client   - File descriptor connected to client.
                   1561: # Returns
                   1562: #     0        - Requested to exit, caller should shut down.
                   1563: #     1        - Continue processing.
                   1564: # Implicit inputs:
                   1565: #    The authentication systems describe above have their own forms of implicit
                   1566: #    input into the authentication process that are described above.
                   1567: sub change_password_handler {
                   1568:     my ($cmd, $tail, $client) = @_;
                   1569: 
                   1570:     my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
                   1571: 
                   1572:     #
                   1573:     #  udom  - user's domain.
                   1574:     #  uname - Username.
                   1575:     #  upass - Current password.
                   1576:     #  npass - New password.
1.346     raeburn  1577:     #  context - Context in which this was called 
                   1578:     #            (preferences or reset_by_email).
1.222     foxr     1579:    
1.346     raeburn  1580:     my ($udom,$uname,$upass,$npass,$context)=split(/:/,$tail);
1.222     foxr     1581: 
                   1582:     $upass=&unescape($upass);
                   1583:     $npass=&unescape($npass);
                   1584:     &Debug("Trying to change password for $uname");
                   1585: 
                   1586:     # First require that the user can be authenticated with their
1.346     raeburn  1587:     # old password unless context was 'reset_by_email':
                   1588:     
                   1589:     my $validated;
                   1590:     if ($context eq 'reset_by_email') {
                   1591:         $validated = 1;
                   1592:     } else {
                   1593:         $validated = &validate_user($udom, $uname, $upass);
                   1594:     }
1.222     foxr     1595:     if($validated) {
                   1596: 	my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
                   1597: 	
                   1598: 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   1599: 	if ($howpwd eq 'internal') {
                   1600: 	    &Debug("internal auth");
                   1601: 	    my $salt=time;
                   1602: 	    $salt=substr($salt,6,2);
                   1603: 	    my $ncpass=crypt($npass,$salt);
                   1604: 	    if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
                   1605: 		&logthis("Result of password change for "
                   1606: 			 ."$uname: pwchange_success");
                   1607: 		&Reply($client, "ok\n", $userinput);
                   1608: 	    } else {
                   1609: 		&logthis("Unable to open $uname passwd "               
                   1610: 			 ."to change password");
                   1611: 		&Failure( $client, "non_authorized\n",$userinput);
                   1612: 	    }
1.346     raeburn  1613: 	} elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') {
1.287     foxr     1614: 	    my $result = &change_unix_password($uname, $npass);
1.222     foxr     1615: 	    &logthis("Result of password change for $uname: ".
1.287     foxr     1616: 		     $result);
1.222     foxr     1617: 	    &Reply($client, "$result\n", $userinput);
                   1618: 	} else {
                   1619: 	    # this just means that the current password mode is not
                   1620: 	    # one we know how to change (e.g the kerberos auth modes or
                   1621: 	    # locally written auth handler).
                   1622: 	    #
                   1623: 	    &Failure( $client, "auth_mode_error\n", $userinput);
                   1624: 	}  
                   1625: 	
1.224     foxr     1626:     } else {
1.222     foxr     1627: 	&Failure( $client, "non_authorized\n", $userinput);
                   1628:     }
                   1629: 
                   1630:     return 1;
                   1631: }
1.263     albertel 1632: &register_handler("passwd", \&change_password_handler, 1, 1, 0);
1.222     foxr     1633: 
1.225     foxr     1634: #
                   1635: #   Create a new user.  User in this case means a lon-capa user.
                   1636: #   The user must either already exist in some authentication realm
                   1637: #   like kerberos or the /etc/passwd.  If not, a user completely local to
                   1638: #   this loncapa system is created.
                   1639: #
                   1640: # Parameters:
                   1641: #    $cmd      - The command that got us here.
                   1642: #    $tail     - Tail of the command (remaining parameters).
                   1643: #    $client   - File descriptor connected to client.
                   1644: # Returns
                   1645: #     0        - Requested to exit, caller should shut down.
                   1646: #     1        - Continue processing.
                   1647: # Implicit inputs:
                   1648: #    The authentication systems describe above have their own forms of implicit
                   1649: #    input into the authentication process that are described above.
                   1650: sub add_user_handler {
                   1651: 
                   1652:     my ($cmd, $tail, $client) = @_;
                   1653: 
                   1654: 
                   1655:     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
                   1656:     my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
                   1657: 
                   1658:     &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
                   1659: 
                   1660: 
                   1661:     if($udom eq $currentdomainid) { # Reject new users for other domains...
                   1662: 	
                   1663: 	my $oldumask=umask(0077);
                   1664: 	chomp($npass);
                   1665: 	$npass=&unescape($npass);
                   1666: 	my $passfilename  = &password_path($udom, $uname);
                   1667: 	&Debug("Password file created will be:".$passfilename);
                   1668: 	if (-e $passfilename) {
                   1669: 	    &Failure( $client, "already_exists\n", $userinput);
                   1670: 	} else {
                   1671: 	    my $fperror='';
1.264     albertel 1672: 	    if (!&mkpath($passfilename)) {
                   1673: 		$fperror="error: ".($!+0)." mkdir failed while attempting "
                   1674: 		    ."makeuser";
1.225     foxr     1675: 	    }
                   1676: 	    unless ($fperror) {
                   1677: 		my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
                   1678: 		&Reply($client, $result, $userinput);     #BUGBUG - could be fail
                   1679: 	    } else {
                   1680: 		&Failure($client, "$fperror\n", $userinput);
                   1681: 	    }
                   1682: 	}
                   1683: 	umask($oldumask);
                   1684:     }  else {
                   1685: 	&Failure($client, "not_right_domain\n",
                   1686: 		$userinput);	# Even if we are multihomed.
                   1687:     
                   1688:     }
                   1689:     return 1;
                   1690: 
                   1691: }
                   1692: &register_handler("makeuser", \&add_user_handler, 1, 1, 0);
                   1693: 
                   1694: #
                   1695: #   Change the authentication method of a user.  Note that this may
                   1696: #   also implicitly change the user's password if, for example, the user is
                   1697: #   joining an existing authentication realm.  Known authentication realms at
                   1698: #   this time are:
                   1699: #    internal   - Purely internal password file (only loncapa knows this user)
                   1700: #    local      - Institutionally written authentication module.
                   1701: #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
                   1702: #    kerb4      - kerberos version 4
                   1703: #    kerb5      - kerberos version 5
                   1704: #
                   1705: # Parameters:
                   1706: #    $cmd      - The command that got us here.
                   1707: #    $tail     - Tail of the command (remaining parameters).
                   1708: #    $client   - File descriptor connected to client.
                   1709: # Returns
                   1710: #     0        - Requested to exit, caller should shut down.
                   1711: #     1        - Continue processing.
                   1712: # Implicit inputs:
                   1713: #    The authentication systems describe above have their own forms of implicit
                   1714: #    input into the authentication process that are described above.
1.287     foxr     1715: # NOTE:
                   1716: #   This is also used to change the authentication credential values (e.g. passwd).
                   1717: #   
1.225     foxr     1718: #
                   1719: sub change_authentication_handler {
                   1720: 
                   1721:     my ($cmd, $tail, $client) = @_;
                   1722:    
                   1723:     my $userinput  = "$cmd:$tail";              # Reconstruct user input.
                   1724: 
                   1725:     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
                   1726:     &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
                   1727:     if ($udom ne $currentdomainid) {
                   1728: 	&Failure( $client, "not_right_domain\n", $client);
                   1729:     } else {
                   1730: 	
                   1731: 	chomp($npass);
                   1732: 	
                   1733: 	$npass=&unescape($npass);
1.261     foxr     1734: 	my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
1.225     foxr     1735: 	my $passfilename = &password_path($udom, $uname);
                   1736: 	if ($passfilename) {	# Not allowed to create a new user!!
1.287     foxr     1737: 	    # If just changing the unix passwd. need to arrange to run
                   1738: 	    # passwd since otherwise make_passwd_file will run
                   1739: 	    # lcuseradd which fails if an account already exists
                   1740: 	    # (to prevent an unscrupulous LONCAPA admin from stealing
                   1741: 	    # an existing account by overwriting it as a LonCAPA account).
                   1742: 
                   1743: 	    if(($oldauth =~/^unix/) && ($umode eq "unix")) {
                   1744: 		my $result = &change_unix_password($uname, $npass);
                   1745: 		&logthis("Result of password change for $uname: ".$result);
                   1746: 		if ($result eq "ok") {
                   1747: 		    &Reply($client, "$result\n")
1.288     albertel 1748: 		} else {
1.287     foxr     1749: 		    &Failure($client, "$result\n");
                   1750: 		}
1.288     albertel 1751: 	    } else {
1.287     foxr     1752: 		my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
                   1753: 		#
                   1754: 		#  If the current auth mode is internal, and the old auth mode was
                   1755: 		#  unix, or krb*,  and the user is an author for this domain,
                   1756: 		#  re-run manage_permissions for that role in order to be able
                   1757: 		#  to take ownership of the construction space back to www:www
                   1758: 		#
                   1759: 		
                   1760: 		
                   1761: 		if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
                   1762: 		    (($oldauth =~ /^internal/) && ($umode eq "unix")) ) { 
                   1763: 		    if(&is_author($udom, $uname)) {
                   1764: 			&Debug(" Need to manage author permissions...");
                   1765: 			&manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
                   1766: 		    }
1.261     foxr     1767: 		}
1.287     foxr     1768: 		&Reply($client, $result, $userinput);
1.261     foxr     1769: 	    }
                   1770: 	       
                   1771: 
1.225     foxr     1772: 	} else {	       
1.251     foxr     1773: 	    &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
1.225     foxr     1774: 	}
                   1775:     }
                   1776:     return 1;
                   1777: }
                   1778: &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
                   1779: 
                   1780: #
                   1781: #   Determines if this is the home server for a user.  The home server
                   1782: #   for a user will have his/her lon-capa passwd file.  Therefore all we need
                   1783: #   to do is determine if this file exists.
                   1784: #
                   1785: # Parameters:
                   1786: #    $cmd      - The command that got us here.
                   1787: #    $tail     - Tail of the command (remaining parameters).
                   1788: #    $client   - File descriptor connected to client.
                   1789: # Returns
                   1790: #     0        - Requested to exit, caller should shut down.
                   1791: #     1        - Continue processing.
                   1792: # Implicit inputs:
                   1793: #    The authentication systems describe above have their own forms of implicit
                   1794: #    input into the authentication process that are described above.
                   1795: #
                   1796: sub is_home_handler {
                   1797:     my ($cmd, $tail, $client) = @_;
                   1798:    
                   1799:     my $userinput  = "$cmd:$tail";
                   1800:    
                   1801:     my ($udom,$uname)=split(/:/,$tail);
                   1802:     chomp($uname);
                   1803:     my $passfile = &password_filename($udom, $uname);
                   1804:     if($passfile) {
                   1805: 	&Reply( $client, "found\n", $userinput);
                   1806:     } else {
                   1807: 	&Failure($client, "not_found\n", $userinput);
                   1808:     }
                   1809:     return 1;
                   1810: }
                   1811: &register_handler("home", \&is_home_handler, 0,1,0);
                   1812: 
                   1813: #
                   1814: #   Process an update request for a resource?? I think what's going on here is
                   1815: #   that a resource has been modified that we hold a subscription to.
                   1816: #   If the resource is not local, then we must update, or at least invalidate our
                   1817: #   cached copy of the resource. 
                   1818: #   FUTURE WORK:
                   1819: #      I need to look at this logic carefully.  My druthers would be to follow
                   1820: #      typical caching logic, and simple invalidate the cache, drop any subscription
                   1821: #      an let the next fetch start the ball rolling again... however that may
                   1822: #      actually be more difficult than it looks given the complex web of
                   1823: #      proxy servers.
                   1824: # Parameters:
                   1825: #    $cmd      - The command that got us here.
                   1826: #    $tail     - Tail of the command (remaining parameters).
                   1827: #    $client   - File descriptor connected to client.
                   1828: # Returns
                   1829: #     0        - Requested to exit, caller should shut down.
                   1830: #     1        - Continue processing.
                   1831: # Implicit inputs:
                   1832: #    The authentication systems describe above have their own forms of implicit
                   1833: #    input into the authentication process that are described above.
                   1834: #
                   1835: sub update_resource_handler {
                   1836: 
                   1837:     my ($cmd, $tail, $client) = @_;
                   1838:    
                   1839:     my $userinput = "$cmd:$tail";
                   1840:    
                   1841:     my $fname= $tail;		# This allows interactive testing
                   1842: 
                   1843: 
                   1844:     my $ownership=ishome($fname);
                   1845:     if ($ownership eq 'not_owner') {
                   1846: 	if (-e $fname) {
                   1847: 	    my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
                   1848: 		$atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
                   1849: 	    my $now=time;
                   1850: 	    my $since=$now-$atime;
                   1851: 	    if ($since>$perlvar{'lonExpire'}) {
                   1852: 		my $reply=&reply("unsub:$fname","$clientname");
1.308     albertel 1853: 		&devalidate_meta_cache($fname);
1.225     foxr     1854: 		unlink("$fname");
1.334     albertel 1855: 		unlink("$fname.meta");
1.225     foxr     1856: 	    } else {
                   1857: 		my $transname="$fname.in.transfer";
                   1858: 		my $remoteurl=&reply("sub:$fname","$clientname");
                   1859: 		my $response;
                   1860: 		alarm(120);
                   1861: 		{
                   1862: 		    my $ua=new LWP::UserAgent;
                   1863: 		    my $request=new HTTP::Request('GET',"$remoteurl");
                   1864: 		    $response=$ua->request($request,$transname);
                   1865: 		}
                   1866: 		alarm(0);
                   1867: 		if ($response->is_error()) {
                   1868: 		    unlink($transname);
                   1869: 		    my $message=$response->status_line;
                   1870: 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
                   1871: 		} else {
                   1872: 		    if ($remoteurl!~/\.meta$/) {
                   1873: 			alarm(120);
                   1874: 			{
                   1875: 			    my $ua=new LWP::UserAgent;
                   1876: 			    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
                   1877: 			    my $mresponse=$ua->request($mrequest,$fname.'.meta');
                   1878: 			    if ($mresponse->is_error()) {
                   1879: 				unlink($fname.'.meta');
                   1880: 			    }
                   1881: 			}
                   1882: 			alarm(0);
                   1883: 		    }
                   1884: 		    rename($transname,$fname);
1.308     albertel 1885: 		    &devalidate_meta_cache($fname);
1.225     foxr     1886: 		}
                   1887: 	    }
                   1888: 	    &Reply( $client, "ok\n", $userinput);
                   1889: 	} else {
                   1890: 	    &Failure($client, "not_found\n", $userinput);
                   1891: 	}
                   1892:     } else {
                   1893: 	&Failure($client, "rejected\n", $userinput);
                   1894:     }
                   1895:     return 1;
                   1896: }
                   1897: &register_handler("update", \&update_resource_handler, 0 ,1, 0);
                   1898: 
1.308     albertel 1899: sub devalidate_meta_cache {
                   1900:     my ($url) = @_;
                   1901:     use Cache::Memcached;
                   1902:     my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
                   1903:     $url = &declutter($url);
                   1904:     $url =~ s-\.meta$--;
                   1905:     my $id = &escape('meta:'.$url);
                   1906:     $memcache->delete($id);
                   1907: }
                   1908: 
                   1909: sub declutter {
                   1910:     my $thisfn=shift;
                   1911:     $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
                   1912:     $thisfn=~s/^\///;
                   1913:     $thisfn=~s|^adm/wrapper/||;
                   1914:     $thisfn=~s|^adm/coursedocs/showdoc/||;
                   1915:     $thisfn=~s/^res\///;
                   1916:     $thisfn=~s/\?.+$//;
                   1917:     return $thisfn;
                   1918: }
1.225     foxr     1919: #
1.226     foxr     1920: #   Fetch a user file from a remote server to the user's home directory
                   1921: #   userfiles subdir.
1.225     foxr     1922: # Parameters:
                   1923: #    $cmd      - The command that got us here.
                   1924: #    $tail     - Tail of the command (remaining parameters).
                   1925: #    $client   - File descriptor connected to client.
                   1926: # Returns
                   1927: #     0        - Requested to exit, caller should shut down.
                   1928: #     1        - Continue processing.
                   1929: #
                   1930: sub fetch_user_file_handler {
                   1931: 
                   1932:     my ($cmd, $tail, $client) = @_;
                   1933: 
                   1934:     my $userinput = "$cmd:$tail";
                   1935:     my $fname           = $tail;
1.232     foxr     1936:     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
1.225     foxr     1937:     my $udir=&propath($udom,$uname).'/userfiles';
                   1938:     unless (-e $udir) {
                   1939: 	mkdir($udir,0770); 
                   1940:     }
1.232     foxr     1941:     Debug("fetch user file for $fname");
1.225     foxr     1942:     if (-e $udir) {
                   1943: 	$ufile=~s/^[\.\~]+//;
1.232     foxr     1944: 
                   1945: 	# IF necessary, create the path right down to the file.
                   1946: 	# Note that any regular files in the way of this path are
                   1947: 	# wiped out to deal with some earlier folly of mine.
                   1948: 
1.267     raeburn  1949: 	if (!&mkpath($udir.'/'.$ufile)) {
1.264     albertel 1950: 	    &Failure($client, "unable_to_create\n", $userinput);	    
1.232     foxr     1951: 	}
                   1952: 
1.225     foxr     1953: 	my $destname=$udir.'/'.$ufile;
                   1954: 	my $transname=$udir.'/'.$ufile.'.in.transit';
                   1955: 	my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
                   1956: 	my $response;
1.232     foxr     1957: 	Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
1.225     foxr     1958: 	alarm(120);
                   1959: 	{
                   1960: 	    my $ua=new LWP::UserAgent;
                   1961: 	    my $request=new HTTP::Request('GET',"$remoteurl");
                   1962: 	    $response=$ua->request($request,$transname);
                   1963: 	}
                   1964: 	alarm(0);
                   1965: 	if ($response->is_error()) {
                   1966: 	    unlink($transname);
                   1967: 	    my $message=$response->status_line;
                   1968: 	    &logthis("LWP GET: $message for $fname ($remoteurl)");
                   1969: 	    &Failure($client, "failed\n", $userinput);
                   1970: 	} else {
1.232     foxr     1971: 	    Debug("Renaming $transname to $destname");
1.225     foxr     1972: 	    if (!rename($transname,$destname)) {
                   1973: 		&logthis("Unable to move $transname to $destname");
                   1974: 		unlink($transname);
                   1975: 		&Failure($client, "failed\n", $userinput);
                   1976: 	    } else {
                   1977: 		&Reply($client, "ok\n", $userinput);
                   1978: 	    }
                   1979: 	}   
                   1980:     } else {
                   1981: 	&Failure($client, "not_home\n", $userinput);
                   1982:     }
                   1983:     return 1;
                   1984: }
                   1985: &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
                   1986: 
1.226     foxr     1987: #
                   1988: #   Remove a file from a user's home directory userfiles subdirectory.
                   1989: # Parameters:
                   1990: #    cmd   - the Lond request keyword that got us here.
                   1991: #    tail  - the part of the command past the keyword.
                   1992: #    client- File descriptor connected with the client.
                   1993: #
                   1994: # Returns:
                   1995: #    1    - Continue processing.
                   1996: sub remove_user_file_handler {
                   1997:     my ($cmd, $tail, $client) = @_;
                   1998: 
                   1999:     my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
                   2000: 
                   2001:     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
                   2002:     if ($ufile =~m|/\.\./|) {
                   2003: 	# any files paths with /../ in them refuse 
                   2004: 	# to deal with
                   2005: 	&Failure($client, "refused\n", "$cmd:$tail");
                   2006:     } else {
                   2007: 	my $udir = &propath($udom,$uname);
                   2008: 	if (-e $udir) {
                   2009: 	    my $file=$udir.'/userfiles/'.$ufile;
                   2010: 	    if (-e $file) {
1.253     foxr     2011: 		#
                   2012: 		#   If the file is a regular file unlink is fine...
                   2013: 		#   However it's possible the client wants a dir.
                   2014: 		#   removed, in which case rmdir is more approprate:
                   2015: 		#
1.240     banghart 2016: 	        if (-f $file){
1.241     albertel 2017: 		    unlink($file);
                   2018: 		} elsif(-d $file) {
                   2019: 		    rmdir($file);
1.240     banghart 2020: 		}
1.226     foxr     2021: 		if (-e $file) {
1.253     foxr     2022: 		    #  File is still there after we deleted it ?!?
                   2023: 
1.226     foxr     2024: 		    &Failure($client, "failed\n", "$cmd:$tail");
                   2025: 		} else {
                   2026: 		    &Reply($client, "ok\n", "$cmd:$tail");
                   2027: 		}
                   2028: 	    } else {
                   2029: 		&Failure($client, "not_found\n", "$cmd:$tail");
                   2030: 	    }
                   2031: 	} else {
                   2032: 	    &Failure($client, "not_home\n", "$cmd:$tail");
                   2033: 	}
                   2034:     }
                   2035:     return 1;
                   2036: }
                   2037: &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
                   2038: 
1.236     albertel 2039: #
                   2040: #   make a directory in a user's home directory userfiles subdirectory.
                   2041: # Parameters:
                   2042: #    cmd   - the Lond request keyword that got us here.
                   2043: #    tail  - the part of the command past the keyword.
                   2044: #    client- File descriptor connected with the client.
                   2045: #
                   2046: # Returns:
                   2047: #    1    - Continue processing.
                   2048: sub mkdir_user_file_handler {
                   2049:     my ($cmd, $tail, $client) = @_;
                   2050: 
                   2051:     my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
                   2052:     $dir=&unescape($dir);
                   2053:     my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
                   2054:     if ($ufile =~m|/\.\./|) {
                   2055: 	# any files paths with /../ in them refuse 
                   2056: 	# to deal with
                   2057: 	&Failure($client, "refused\n", "$cmd:$tail");
                   2058:     } else {
                   2059: 	my $udir = &propath($udom,$uname);
                   2060: 	if (-e $udir) {
1.264     albertel 2061: 	    my $newdir=$udir.'/userfiles/'.$ufile.'/';
                   2062: 	    if (!&mkpath($newdir)) {
                   2063: 		&Failure($client, "failed\n", "$cmd:$tail");
1.236     albertel 2064: 	    }
1.264     albertel 2065: 	    &Reply($client, "ok\n", "$cmd:$tail");
1.236     albertel 2066: 	} else {
                   2067: 	    &Failure($client, "not_home\n", "$cmd:$tail");
                   2068: 	}
                   2069:     }
                   2070:     return 1;
                   2071: }
                   2072: &register_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
                   2073: 
1.237     albertel 2074: #
                   2075: #   rename a file in a user's home directory userfiles subdirectory.
                   2076: # Parameters:
                   2077: #    cmd   - the Lond request keyword that got us here.
                   2078: #    tail  - the part of the command past the keyword.
                   2079: #    client- File descriptor connected with the client.
                   2080: #
                   2081: # Returns:
                   2082: #    1    - Continue processing.
                   2083: sub rename_user_file_handler {
                   2084:     my ($cmd, $tail, $client) = @_;
                   2085: 
                   2086:     my ($udom,$uname,$old,$new) = split(/:/, $tail);
                   2087:     $old=&unescape($old);
                   2088:     $new=&unescape($new);
                   2089:     if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
                   2090: 	# any files paths with /../ in them refuse to deal with
                   2091: 	&Failure($client, "refused\n", "$cmd:$tail");
                   2092:     } else {
                   2093: 	my $udir = &propath($udom,$uname);
                   2094: 	if (-e $udir) {
                   2095: 	    my $oldfile=$udir.'/userfiles/'.$old;
                   2096: 	    my $newfile=$udir.'/userfiles/'.$new;
                   2097: 	    if (-e $newfile) {
                   2098: 		&Failure($client, "exists\n", "$cmd:$tail");
                   2099: 	    } elsif (! -e $oldfile) {
                   2100: 		&Failure($client, "not_found\n", "$cmd:$tail");
                   2101: 	    } else {
                   2102: 		if (!rename($oldfile,$newfile)) {
                   2103: 		    &Failure($client, "failed\n", "$cmd:$tail");
                   2104: 		} else {
                   2105: 		    &Reply($client, "ok\n", "$cmd:$tail");
                   2106: 		}
                   2107: 	    }
                   2108: 	} else {
                   2109: 	    &Failure($client, "not_home\n", "$cmd:$tail");
                   2110: 	}
                   2111:     }
                   2112:     return 1;
                   2113: }
                   2114: &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
                   2115: 
1.227     foxr     2116: #
1.263     albertel 2117: #  Authenticate access to a user file by checking that the token the user's 
                   2118: #  passed also exists in their session file
1.227     foxr     2119: #
                   2120: # Parameters:
                   2121: #   cmd      - The request keyword that dispatched to tus.
                   2122: #   tail     - The tail of the request (colon separated parameters).
                   2123: #   client   - Filehandle open on the client.
                   2124: # Return:
                   2125: #    1.
                   2126: sub token_auth_user_file_handler {
                   2127:     my ($cmd, $tail, $client) = @_;
                   2128: 
                   2129:     my ($fname, $session) = split(/:/, $tail);
                   2130:     
                   2131:     chomp($session);
1.251     foxr     2132:     my $reply="non_auth\n";
1.343     albertel 2133:     my $file = $perlvar{'lonIDsDir'}.'/'.$session.'.id';
                   2134:     if (open(ENVIN,"$file")) {
1.332     albertel 2135: 	flock(ENVIN,LOCK_SH);
1.343     albertel 2136: 	tie(my %disk_env,'GDBM_File',"$file",&GDBM_READER(),0640);
                   2137: 	if (exists($disk_env{"userfile.$fname"})) {
                   2138: 	    $reply="ok\n";
                   2139: 	} else {
                   2140: 	    foreach my $envname (keys(%disk_env)) {
                   2141: 		if ($envname=~ m|^userfile\.\Q$fname\E|) {
                   2142: 		    $reply="ok\n";
                   2143: 		    last;
                   2144: 		}
                   2145: 	    }
1.227     foxr     2146: 	}
1.343     albertel 2147: 	untie(%disk_env);
1.227     foxr     2148: 	close(ENVIN);
1.251     foxr     2149: 	&Reply($client, $reply, "$cmd:$tail");
1.227     foxr     2150:     } else {
                   2151: 	&Failure($client, "invalid_token\n", "$cmd:$tail");
                   2152:     }
                   2153:     return 1;
                   2154: 
                   2155: }
                   2156: &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
1.229     foxr     2157: 
                   2158: #
                   2159: #   Unsubscribe from a resource.
                   2160: #
                   2161: # Parameters:
                   2162: #    $cmd      - The command that got us here.
                   2163: #    $tail     - Tail of the command (remaining parameters).
                   2164: #    $client   - File descriptor connected to client.
                   2165: # Returns
                   2166: #     0        - Requested to exit, caller should shut down.
                   2167: #     1        - Continue processing.
                   2168: #
                   2169: sub unsubscribe_handler {
                   2170:     my ($cmd, $tail, $client) = @_;
                   2171: 
                   2172:     my $userinput= "$cmd:$tail";
                   2173:     
                   2174:     my ($fname) = split(/:/,$tail); # Split in case there's extrs.
                   2175: 
                   2176:     &Debug("Unsubscribing $fname");
                   2177:     if (-e $fname) {
                   2178: 	&Debug("Exists");
                   2179: 	&Reply($client, &unsub($fname,$clientip), $userinput);
                   2180:     } else {
                   2181: 	&Failure($client, "not_found\n", $userinput);
                   2182:     }
                   2183:     return 1;
                   2184: }
                   2185: &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
1.263     albertel 2186: 
1.230     foxr     2187: #   Subscribe to a resource
                   2188: #
                   2189: # Parameters:
                   2190: #    $cmd      - The command that got us here.
                   2191: #    $tail     - Tail of the command (remaining parameters).
                   2192: #    $client   - File descriptor connected to client.
                   2193: # Returns
                   2194: #     0        - Requested to exit, caller should shut down.
                   2195: #     1        - Continue processing.
                   2196: #
                   2197: sub subscribe_handler {
                   2198:     my ($cmd, $tail, $client)= @_;
                   2199: 
                   2200:     my $userinput  = "$cmd:$tail";
                   2201: 
                   2202:     &Reply( $client, &subscribe($userinput,$clientip), $userinput);
                   2203: 
                   2204:     return 1;
                   2205: }
                   2206: &register_handler("sub", \&subscribe_handler, 0, 1, 0);
                   2207: 
                   2208: #
                   2209: #   Determine the version of a resource (?) Or is it return
                   2210: #   the top version of the resource?  Not yet clear from the
                   2211: #   code in currentversion.
                   2212: #
                   2213: # Parameters:
                   2214: #    $cmd      - The command that got us here.
                   2215: #    $tail     - Tail of the command (remaining parameters).
                   2216: #    $client   - File descriptor connected to client.
                   2217: # Returns
                   2218: #     0        - Requested to exit, caller should shut down.
                   2219: #     1        - Continue processing.
                   2220: #
                   2221: sub current_version_handler {
                   2222:     my ($cmd, $tail, $client) = @_;
                   2223: 
                   2224:     my $userinput= "$cmd:$tail";
                   2225:    
                   2226:     my $fname   = $tail;
                   2227:     &Reply( $client, &currentversion($fname)."\n", $userinput);
                   2228:     return 1;
                   2229: 
                   2230: }
                   2231: &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
                   2232: 
                   2233: #  Make an entry in a user's activity log.
                   2234: #
                   2235: # Parameters:
                   2236: #    $cmd      - The command that got us here.
                   2237: #    $tail     - Tail of the command (remaining parameters).
                   2238: #    $client   - File descriptor connected to client.
                   2239: # Returns
                   2240: #     0        - Requested to exit, caller should shut down.
                   2241: #     1        - Continue processing.
                   2242: #
                   2243: sub activity_log_handler {
                   2244:     my ($cmd, $tail, $client) = @_;
                   2245: 
                   2246: 
                   2247:     my $userinput= "$cmd:$tail";
                   2248: 
                   2249:     my ($udom,$uname,$what)=split(/:/,$tail);
                   2250:     chomp($what);
                   2251:     my $proname=&propath($udom,$uname);
                   2252:     my $now=time;
                   2253:     my $hfh;
                   2254:     if ($hfh=IO::File->new(">>$proname/activity.log")) { 
                   2255: 	print $hfh "$now:$clientname:$what\n";
                   2256: 	&Reply( $client, "ok\n", $userinput); 
                   2257:     } else {
                   2258: 	&Failure($client, "error: ".($!+0)." IO::File->new Failed "
                   2259: 		 ."while attempting log\n", 
                   2260: 		 $userinput);
                   2261:     }
                   2262: 
                   2263:     return 1;
                   2264: }
1.263     albertel 2265: &register_handler("log", \&activity_log_handler, 0, 1, 0);
1.230     foxr     2266: 
                   2267: #
                   2268: #   Put a namespace entry in a user profile hash.
                   2269: #   My druthers would be for this to be an encrypted interaction too.
                   2270: #   anything that might be an inadvertent covert channel about either
                   2271: #   user authentication or user personal information....
                   2272: #
                   2273: # Parameters:
                   2274: #    $cmd      - The command that got us here.
                   2275: #    $tail     - Tail of the command (remaining parameters).
                   2276: #    $client   - File descriptor connected to client.
                   2277: # Returns
                   2278: #     0        - Requested to exit, caller should shut down.
                   2279: #     1        - Continue processing.
                   2280: #
                   2281: sub put_user_profile_entry {
                   2282:     my ($cmd, $tail, $client)  = @_;
1.229     foxr     2283: 
1.230     foxr     2284:     my $userinput = "$cmd:$tail";
                   2285:     
1.242     raeburn  2286:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
1.230     foxr     2287:     if ($namespace ne 'roles') {
                   2288: 	chomp($what);
                   2289: 	my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2290: 				  &GDBM_WRCREAT(),"P",$what);
                   2291: 	if($hashref) {
                   2292: 	    my @pairs=split(/\&/,$what);
                   2293: 	    foreach my $pair (@pairs) {
                   2294: 		my ($key,$value)=split(/=/,$pair);
                   2295: 		$hashref->{$key}=$value;
                   2296: 	    }
1.311     albertel 2297: 	    if (&untie_user_hash($hashref)) {
1.230     foxr     2298: 		&Reply( $client, "ok\n", $userinput);
                   2299: 	    } else {
                   2300: 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                   2301: 			"while attempting put\n", 
                   2302: 			$userinput);
                   2303: 	    }
                   2304: 	} else {
1.316     albertel 2305: 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1.230     foxr     2306: 		     "while attempting put\n", $userinput);
                   2307: 	}
                   2308:     } else {
                   2309:         &Failure( $client, "refused\n", $userinput);
                   2310:     }
                   2311:     
                   2312:     return 1;
                   2313: }
                   2314: &register_handler("put", \&put_user_profile_entry, 0, 1, 0);
                   2315: 
1.283     albertel 2316: #   Put a piece of new data in hash, returns error if entry already exists
                   2317: # Parameters:
                   2318: #    $cmd      - The command that got us here.
                   2319: #    $tail     - Tail of the command (remaining parameters).
                   2320: #    $client   - File descriptor connected to client.
                   2321: # Returns
                   2322: #     0        - Requested to exit, caller should shut down.
                   2323: #     1        - Continue processing.
                   2324: #
                   2325: sub newput_user_profile_entry {
                   2326:     my ($cmd, $tail, $client)  = @_;
                   2327: 
                   2328:     my $userinput = "$cmd:$tail";
                   2329: 
                   2330:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
                   2331:     if ($namespace eq 'roles') {
                   2332:         &Failure( $client, "refused\n", $userinput);
                   2333: 	return 1;
                   2334:     }
                   2335: 
                   2336:     chomp($what);
                   2337: 
                   2338:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2339: 				 &GDBM_WRCREAT(),"N",$what);
                   2340:     if(!$hashref) {
1.316     albertel 2341: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1.283     albertel 2342: 		  "while attempting put\n", $userinput);
                   2343: 	return 1;
                   2344:     }
                   2345: 
                   2346:     my @pairs=split(/\&/,$what);
                   2347:     foreach my $pair (@pairs) {
                   2348: 	my ($key,$value)=split(/=/,$pair);
                   2349: 	if (exists($hashref->{$key})) {
                   2350: 	    &Failure($client, "key_exists: ".$key."\n",$userinput);
                   2351: 	    return 1;
                   2352: 	}
                   2353:     }
                   2354: 
                   2355:     foreach my $pair (@pairs) {
                   2356: 	my ($key,$value)=split(/=/,$pair);
                   2357: 	$hashref->{$key}=$value;
                   2358:     }
                   2359: 
1.311     albertel 2360:     if (&untie_user_hash($hashref)) {
1.283     albertel 2361: 	&Reply( $client, "ok\n", $userinput);
                   2362:     } else {
                   2363: 	&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                   2364: 		 "while attempting put\n", 
                   2365: 		 $userinput);
                   2366:     }
                   2367:     return 1;
                   2368: }
                   2369: &register_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
                   2370: 
1.230     foxr     2371: # 
                   2372: #   Increment a profile entry in the user history file.
                   2373: #   The history contains keyword value pairs.  In this case,
                   2374: #   The value itself is a pair of numbers.  The first, the current value
                   2375: #   the second an increment that this function applies to the current
                   2376: #   value.
                   2377: #
                   2378: # Parameters:
                   2379: #    $cmd      - The command that got us here.
                   2380: #    $tail     - Tail of the command (remaining parameters).
                   2381: #    $client   - File descriptor connected to client.
                   2382: # Returns
                   2383: #     0        - Requested to exit, caller should shut down.
                   2384: #     1        - Continue processing.
                   2385: #
                   2386: sub increment_user_value_handler {
                   2387:     my ($cmd, $tail, $client) = @_;
                   2388:     
                   2389:     my $userinput   = "$cmd:$tail";
                   2390:     
                   2391:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
                   2392:     if ($namespace ne 'roles') {
                   2393:         chomp($what);
                   2394: 	my $hashref = &tie_user_hash($udom, $uname,
                   2395: 				     $namespace, &GDBM_WRCREAT(),
                   2396: 				     "P",$what);
                   2397: 	if ($hashref) {
                   2398: 	    my @pairs=split(/\&/,$what);
                   2399: 	    foreach my $pair (@pairs) {
                   2400: 		my ($key,$value)=split(/=/,$pair);
1.284     raeburn  2401:                 $value = &unescape($value);
1.230     foxr     2402: 		# We could check that we have a number...
                   2403: 		if (! defined($value) || $value eq '') {
                   2404: 		    $value = 1;
                   2405: 		}
                   2406: 		$hashref->{$key}+=$value;
1.284     raeburn  2407:                 if ($namespace eq 'nohist_resourcetracker') {
                   2408:                     if ($hashref->{$key} < 0) {
                   2409:                         $hashref->{$key} = 0;
                   2410:                     }
                   2411:                 }
1.230     foxr     2412: 	    }
1.311     albertel 2413: 	    if (&untie_user_hash($hashref)) {
1.230     foxr     2414: 		&Reply( $client, "ok\n", $userinput);
                   2415: 	    } else {
                   2416: 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                   2417: 			 "while attempting inc\n", $userinput);
                   2418: 	    }
                   2419: 	} else {
                   2420: 	    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2421: 		     "while attempting inc\n", $userinput);
                   2422: 	}
                   2423:     } else {
                   2424: 	&Failure($client, "refused\n", $userinput);
                   2425:     }
                   2426:     
                   2427:     return 1;
                   2428: }
                   2429: &register_handler("inc", \&increment_user_value_handler, 0, 1, 0);
                   2430: 
                   2431: #
                   2432: #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
                   2433: #   Each 'role' a user has implies a set of permissions.  Adding a new role
                   2434: #   for a person grants the permissions packaged with that role
                   2435: #   to that user when the role is selected.
                   2436: #
                   2437: # Parameters:
                   2438: #    $cmd       - The command string (rolesput).
                   2439: #    $tail      - The remainder of the request line.  For rolesput this
                   2440: #                 consists of a colon separated list that contains:
                   2441: #                 The domain and user that is granting the role (logged).
                   2442: #                 The domain and user that is getting the role.
                   2443: #                 The roles being granted as a set of & separated pairs.
                   2444: #                 each pair a key value pair.
                   2445: #    $client    - File descriptor connected to the client.
                   2446: # Returns:
                   2447: #     0         - If the daemon should exit
                   2448: #     1         - To continue processing.
                   2449: #
                   2450: #
                   2451: sub roles_put_handler {
                   2452:     my ($cmd, $tail, $client) = @_;
                   2453: 
                   2454:     my $userinput  = "$cmd:$tail";
                   2455: 
                   2456:     my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);
                   2457:     
                   2458: 
                   2459:     my $namespace='roles';
                   2460:     chomp($what);
                   2461:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2462: 				 &GDBM_WRCREAT(), "P",
                   2463: 				 "$exedom:$exeuser:$what");
                   2464:     #
                   2465:     #  Log the attempt to set a role.  The {}'s here ensure that the file 
                   2466:     #  handle is open for the minimal amount of time.  Since the flush
                   2467:     #  is done on close this improves the chances the log will be an un-
                   2468:     #  corrupted ordered thing.
                   2469:     if ($hashref) {
1.261     foxr     2470: 	my $pass_entry = &get_auth_type($udom, $uname);
                   2471: 	my ($auth_type,$pwd)  = split(/:/, $pass_entry);
                   2472: 	$auth_type = $auth_type.":";
1.230     foxr     2473: 	my @pairs=split(/\&/,$what);
                   2474: 	foreach my $pair (@pairs) {
                   2475: 	    my ($key,$value)=split(/=/,$pair);
                   2476: 	    &manage_permissions($key, $udom, $uname,
1.260     foxr     2477: 			       $auth_type);
1.230     foxr     2478: 	    $hashref->{$key}=$value;
                   2479: 	}
1.311     albertel 2480: 	if (&untie_user_hash($hashref)) {
1.230     foxr     2481: 	    &Reply($client, "ok\n", $userinput);
                   2482: 	} else {
                   2483: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2484: 		     "while attempting rolesput\n", $userinput);
                   2485: 	}
                   2486:     } else {
                   2487: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2488: 		 "while attempting rolesput\n", $userinput);
                   2489:     }
                   2490:     return 1;
                   2491: }
                   2492: &register_handler("rolesput", \&roles_put_handler, 1,1,0);  # Encoded client only.
                   2493: 
                   2494: #
1.231     foxr     2495: #   Deletes (removes) a role for a user.   This is equivalent to removing
                   2496: #  a permissions package associated with the role from the user's profile.
                   2497: #
                   2498: # Parameters:
                   2499: #     $cmd                 - The command (rolesdel)
                   2500: #     $tail                - The remainder of the request line. This consists
                   2501: #                             of:
                   2502: #                             The domain and user requesting the change (logged)
                   2503: #                             The domain and user being changed.
                   2504: #                             The roles being revoked.  These are shipped to us
                   2505: #                             as a bunch of & separated role name keywords.
                   2506: #     $client              - The file handle open on the client.
                   2507: # Returns:
                   2508: #     1                    - Continue processing
                   2509: #     0                    - Exit.
                   2510: #
                   2511: sub roles_delete_handler {
                   2512:     my ($cmd, $tail, $client)  = @_;
                   2513: 
                   2514:     my $userinput    = "$cmd:$tail";
                   2515:    
                   2516:     my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
                   2517:     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
                   2518: 	   "what = ".$what);
                   2519:     my $namespace='roles';
                   2520:     chomp($what);
                   2521:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2522: 				 &GDBM_WRCREAT(), "D",
                   2523: 				 "$exedom:$exeuser:$what");
                   2524:     
                   2525:     if ($hashref) {
                   2526: 	my @rolekeys=split(/\&/,$what);
                   2527: 	
                   2528: 	foreach my $key (@rolekeys) {
                   2529: 	    delete $hashref->{$key};
                   2530: 	}
1.315     albertel 2531: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2532: 	    &Reply($client, "ok\n", $userinput);
                   2533: 	} else {
                   2534: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2535: 		     "while attempting rolesdel\n", $userinput);
                   2536: 	}
                   2537:     } else {
                   2538:         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2539: 		 "while attempting rolesdel\n", $userinput);
                   2540:     }
                   2541:     
                   2542:     return 1;
                   2543: }
                   2544: &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
                   2545: 
                   2546: # Unencrypted get from a user's profile database.  See 
                   2547: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
                   2548: # This function retrieves a keyed item from a specific named database in the
                   2549: # user's directory.
                   2550: #
                   2551: # Parameters:
                   2552: #   $cmd             - Command request keyword (get).
                   2553: #   $tail            - Tail of the command.  This is a colon separated list
                   2554: #                      consisting of the domain and username that uniquely
                   2555: #                      identifies the profile,
                   2556: #                      The 'namespace' which selects the gdbm file to 
                   2557: #                      do the lookup in, 
                   2558: #                      & separated list of keys to lookup.  Note that
                   2559: #                      the values are returned as an & separated list too.
                   2560: #   $client          - File descriptor open on the client.
                   2561: # Returns:
                   2562: #   1       - Continue processing.
                   2563: #   0       - Exit.
                   2564: #
                   2565: sub get_profile_entry {
                   2566:     my ($cmd, $tail, $client) = @_;
                   2567: 
                   2568:     my $userinput= "$cmd:$tail";
                   2569:    
                   2570:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
                   2571:     chomp($what);
1.255     foxr     2572: 
                   2573:     my $replystring = read_profile($udom, $uname, $namespace, $what);
                   2574:     my ($first) = split(/:/,$replystring);
                   2575:     if($first ne "error") {
                   2576: 	&Reply($client, "$replystring\n", $userinput);
1.231     foxr     2577:     } else {
1.255     foxr     2578: 	&Failure($client, $replystring." while attempting get\n", $userinput);
1.231     foxr     2579:     }
                   2580:     return 1;
1.255     foxr     2581: 
                   2582: 
1.231     foxr     2583: }
                   2584: &register_handler("get", \&get_profile_entry, 0,1,0);
                   2585: 
                   2586: #
                   2587: #  Process the encrypted get request.  Note that the request is sent
                   2588: #  in clear, but the reply is encrypted.  This is a small covert channel:
                   2589: #  information about the sensitive keys is given to the snooper.  Just not
                   2590: #  information about the values of the sensitive key.  Hmm if I wanted to
                   2591: #  know these I'd snoop for the egets. Get the profile item names from them
                   2592: #  and then issue a get for them since there's no enforcement of the
                   2593: #  requirement of an encrypted get for particular profile items.  If I
                   2594: #  were re-doing this, I'd force the request to be encrypted as well as the
                   2595: #  reply.  I'd also just enforce encrypted transactions for all gets since
                   2596: #  that would prevent any covert channel snooping.
                   2597: #
                   2598: #  Parameters:
                   2599: #     $cmd               - Command keyword of request (eget).
                   2600: #     $tail              - Tail of the command.  See GetProfileEntry
#                          for more information about this.
                   2601: #     $client            - File open on the client.
                   2602: #  Returns:
                   2603: #     1      - Continue processing
                   2604: #     0      - server should exit.
                   2605: sub get_profile_entry_encrypted {
                   2606:     my ($cmd, $tail, $client) = @_;
                   2607: 
                   2608:     my $userinput = "$cmd:$tail";
                   2609:    
1.339     albertel 2610:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
1.231     foxr     2611:     chomp($what);
1.255     foxr     2612:     my $qresult = read_profile($udom, $uname, $namespace, $what);
                   2613:     my ($first) = split(/:/, $qresult);
                   2614:     if($first ne "error") {
                   2615: 	
                   2616: 	if ($cipher) {
                   2617: 	    my $cmdlength=length($qresult);
                   2618: 	    $qresult.="         ";
                   2619: 	    my $encqresult='';
                   2620: 	    for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
                   2621: 		$encqresult.= unpack("H16", 
                   2622: 				     $cipher->encrypt(substr($qresult,
                   2623: 							     $encidx,
                   2624: 							     8)));
                   2625: 	    }
                   2626: 	    &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
                   2627: 	} else {
1.231     foxr     2628: 		&Failure( $client, "error:no_key\n", $userinput);
                   2629: 	    }
                   2630:     } else {
1.255     foxr     2631: 	&Failure($client, "$qresult while attempting eget\n", $userinput);
                   2632: 
1.231     foxr     2633:     }
                   2634:     
                   2635:     return 1;
                   2636: }
1.255     foxr     2637: &register_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
1.263     albertel 2638: 
1.231     foxr     2639: #
                   2640: #   Deletes a key in a user profile database.
                   2641: #   
                   2642: #   Parameters:
                   2643: #       $cmd                  - Command keyword (del).
                   2644: #       $tail                 - Command tail.  IN this case a colon
                   2645: #                               separated list containing:
                   2646: #                               The domain and user that identifies uniquely
                   2647: #                               the identity of the user.
                   2648: #                               The profile namespace (name of the profile
                   2649: #                               database file).
                   2650: #                               & separated list of keywords to delete.
                   2651: #       $client              - File open on client socket.
                   2652: # Returns:
                   2653: #     1   - Continue processing
                   2654: #     0   - Exit server.
                   2655: #
                   2656: #
                   2657: sub delete_profile_entry {
                   2658:     my ($cmd, $tail, $client) = @_;
                   2659: 
                   2660:     my $userinput = "cmd:$tail";
                   2661: 
                   2662:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
                   2663:     chomp($what);
                   2664:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2665: 				 &GDBM_WRCREAT(),
                   2666: 				 "D",$what);
                   2667:     if ($hashref) {
                   2668:         my @keys=split(/\&/,$what);
                   2669: 	foreach my $key (@keys) {
                   2670: 	    delete($hashref->{$key});
                   2671: 	}
1.315     albertel 2672: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2673: 	    &Reply($client, "ok\n", $userinput);
                   2674: 	} else {
                   2675: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2676: 		    "while attempting del\n", $userinput);
                   2677: 	}
                   2678:     } else {
                   2679: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2680: 		 "while attempting del\n", $userinput);
                   2681:     }
                   2682:     return 1;
                   2683: }
                   2684: &register_handler("del", \&delete_profile_entry, 0, 1, 0);
1.263     albertel 2685: 
1.231     foxr     2686: #
                   2687: #  List the set of keys that are defined in a profile database file.
                   2688: #  A successful reply from this will contain an & separated list of
                   2689: #  the keys. 
                   2690: # Parameters:
                   2691: #     $cmd              - Command request (keys).
                   2692: #     $tail             - Remainder of the request, a colon separated
                   2693: #                         list containing domain/user that identifies the
                   2694: #                         user being queried, and the database namespace
                   2695: #                         (database filename essentially).
                   2696: #     $client           - File open on the client.
                   2697: #  Returns:
                   2698: #    1    - Continue processing.
                   2699: #    0    - Exit the server.
                   2700: #
                   2701: sub get_profile_keys {
                   2702:     my ($cmd, $tail, $client) = @_;
                   2703: 
                   2704:     my $userinput = "$cmd:$tail";
                   2705: 
                   2706:     my ($udom,$uname,$namespace)=split(/:/,$tail);
                   2707:     my $qresult='';
                   2708:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2709: 				  &GDBM_READER());
                   2710:     if ($hashref) {
                   2711: 	foreach my $key (keys %$hashref) {
                   2712: 	    $qresult.="$key&";
                   2713: 	}
1.315     albertel 2714: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2715: 	    $qresult=~s/\&$//;
                   2716: 	    &Reply($client, "$qresult\n", $userinput);
                   2717: 	} else {
                   2718: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2719: 		    "while attempting keys\n", $userinput);
                   2720: 	}
                   2721:     } else {
                   2722: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2723: 		 "while attempting keys\n", $userinput);
                   2724:     }
                   2725:    
                   2726:     return 1;
                   2727: }
                   2728: &register_handler("keys", \&get_profile_keys, 0, 1, 0);
                   2729: 
                   2730: #
                   2731: #   Dump the contents of a user profile database.
                   2732: #   Note that this constitutes a very large covert channel too since
                   2733: #   the dump will return sensitive information that is not encrypted.
                   2734: #   The naive security assumption is that the session negotiation ensures
                   2735: #   our client is trusted and I don't believe that's assured at present.
                   2736: #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
                   2737: #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
                   2738: # 
                   2739: #  Parameters:
                   2740: #     $cmd           - The command request keyword (currentdump).
                   2741: #     $tail          - Remainder of the request, consisting of a colon
                   2742: #                      separated list that has the domain/username and
                   2743: #                      the namespace to dump (database file).
                   2744: #     $client        - file open on the remote client.
                   2745: # Returns:
                   2746: #     1    - Continue processing.
                   2747: #     0    - Exit the server.
                   2748: #
                   2749: sub dump_profile_database {
                   2750:     my ($cmd, $tail, $client) = @_;
                   2751: 
                   2752:     my $userinput = "$cmd:$tail";
                   2753:    
                   2754:     my ($udom,$uname,$namespace) = split(/:/,$tail);
                   2755:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2756: 				 &GDBM_READER());
                   2757:     if ($hashref) {
                   2758: 	# Structure of %data:
                   2759: 	# $data{$symb}->{$parameter}=$value;
                   2760: 	# $data{$symb}->{'v.'.$parameter}=$version;
                   2761: 	# since $parameter will be unescaped, we do not
                   2762:  	# have to worry about silly parameter names...
                   2763: 	
                   2764:         my $qresult='';
                   2765: 	my %data = ();                     # A hash of anonymous hashes..
                   2766: 	while (my ($key,$value) = each(%$hashref)) {
                   2767: 	    my ($v,$symb,$param) = split(/:/,$key);
                   2768: 	    next if ($v eq 'version' || $symb eq 'keys');
                   2769: 	    next if (exists($data{$symb}) && 
                   2770: 		     exists($data{$symb}->{$param}) &&
                   2771: 		     $data{$symb}->{'v.'.$param} > $v);
                   2772: 	    $data{$symb}->{$param}=$value;
                   2773: 	    $data{$symb}->{'v.'.$param}=$v;
                   2774: 	}
1.311     albertel 2775: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2776: 	    while (my ($symb,$param_hash) = each(%data)) {
                   2777: 		while(my ($param,$value) = each (%$param_hash)){
                   2778: 		    next if ($param =~ /^v\./);       # Ignore versions...
                   2779: 		    #
                   2780: 		    #   Just dump the symb=value pairs separated by &
                   2781: 		    #
                   2782: 		    $qresult.=$symb.':'.$param.'='.$value.'&';
                   2783: 		}
                   2784: 	    }
                   2785: 	    chop($qresult);
                   2786: 	    &Reply($client , "$qresult\n", $userinput);
                   2787: 	} else {
                   2788: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2789: 		     "while attempting currentdump\n", $userinput);
                   2790: 	}
                   2791:     } else {
                   2792: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2793: 		"while attempting currentdump\n", $userinput);
                   2794:     }
                   2795: 
                   2796:     return 1;
                   2797: }
                   2798: &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
                   2799: 
                   2800: #
                   2801: #   Dump a profile database with an optional regular expression
                   2802: #   to match against the keys.  In this dump, no effort is made
                   2803: #   to separate symb from version information. Presumably the
                   2804: #   databases that are dumped by this command are of a different
                   2805: #   structure.  Need to look at this and improve the documentation of
                   2806: #   both this and the currentdump handler.
                   2807: # Parameters:
                   2808: #    $cmd                     - The command keyword.
                   2809: #    $tail                    - All of the characters after the $cmd:
                   2810: #                               These are expected to be a colon
                   2811: #                               separated list containing:
                   2812: #                               domain/user - identifying the user.
                   2813: #                               namespace   - identifying the database.
                   2814: #                               regexp      - optional regular expression
                   2815: #                                             that is matched against
                   2816: #                                             database keywords to do
                   2817: #                                             selective dumps.
                   2818: #   $client                   - Channel open on the client.
                   2819: # Returns:
                   2820: #    1    - Continue processing.
                   2821: # Side effects:
                   2822: #    response is written to $client.
                   2823: #
                   2824: sub dump_with_regexp {
                   2825:     my ($cmd, $tail, $client) = @_;
                   2826: 
                   2827: 
                   2828:     my $userinput = "$cmd:$tail";
                   2829: 
1.306     albertel 2830:     my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
1.231     foxr     2831:     if (defined($regexp)) {
                   2832: 	$regexp=&unescape($regexp);
                   2833:     } else {
                   2834: 	$regexp='.';
                   2835:     }
1.306     albertel 2836:     my ($start,$end);
                   2837:     if (defined($range)) {
                   2838: 	if ($range =~/^(\d+)\-(\d+)$/) {
                   2839: 	    ($start,$end) = ($1,$2);
                   2840: 	} elsif ($range =~/^(\d+)$/) {
                   2841: 	    ($start,$end) = (0,$1);
                   2842: 	} else {
                   2843: 	    undef($range);
                   2844: 	}
                   2845:     }
1.231     foxr     2846:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2847: 				 &GDBM_READER());
                   2848:     if ($hashref) {
                   2849:         my $qresult='';
1.306     albertel 2850: 	my $count=0;
1.231     foxr     2851: 	while (my ($key,$value) = each(%$hashref)) {
                   2852: 	    if ($regexp eq '.') {
1.306     albertel 2853: 		$count++;
                   2854: 		if (defined($range) && $count >= $end)   { last; }
                   2855: 		if (defined($range) && $count <  $start) { next; }
1.231     foxr     2856: 		$qresult.=$key.'='.$value.'&';
                   2857: 	    } else {
                   2858: 		my $unescapeKey = &unescape($key);
                   2859: 		if (eval('$unescapeKey=~/$regexp/')) {
1.306     albertel 2860: 		    $count++;
                   2861: 		    if (defined($range) && $count >= $end)   { last; }
                   2862: 		    if (defined($range) && $count <  $start) { next; }
1.231     foxr     2863: 		    $qresult.="$key=$value&";
                   2864: 		}
                   2865: 	    }
                   2866: 	}
1.311     albertel 2867: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2868: 	    chop($qresult);
                   2869: 	    &Reply($client, "$qresult\n", $userinput);
                   2870: 	} else {
                   2871: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2872: 		     "while attempting dump\n", $userinput);
                   2873: 	}
                   2874:     } else {
                   2875: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2876: 		"while attempting dump\n", $userinput);
                   2877:     }
                   2878: 
                   2879:     return 1;
                   2880: }
                   2881: &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
                   2882: 
                   2883: #  Store a set of key=value pairs associated with a versioned name.
                   2884: #
                   2885: #  Parameters:
                   2886: #    $cmd                - Request command keyword.
                   2887: #    $tail               - Tail of the request.  This is a colon
                   2888: #                          separated list containing:
                   2889: #                          domain/user - User and authentication domain.
                   2890: #                          namespace   - Name of the database being modified
                   2891: #                          rid         - Resource keyword to modify.
                   2892: #                          what        - new value associated with rid.
                   2893: #
                   2894: #    $client             - Socket open on the client.
                   2895: #
                   2896: #
                   2897: #  Returns:
                   2898: #      1 (keep on processing).
                   2899: #  Side-Effects:
                   2900: #    Writes to the client
                   2901: sub store_handler {
                   2902:     my ($cmd, $tail, $client) = @_;
                   2903:  
                   2904:     my $userinput = "$cmd:$tail";
                   2905: 
                   2906:     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
                   2907:     if ($namespace ne 'roles') {
                   2908: 
                   2909: 	chomp($what);
                   2910: 	my @pairs=split(/\&/,$what);
                   2911: 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
1.268     albertel 2912: 				       &GDBM_WRCREAT(), "S",
1.231     foxr     2913: 				       "$rid:$what");
                   2914: 	if ($hashref) {
                   2915: 	    my $now = time;
                   2916: 	    my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
                   2917: 	    my $key;
                   2918: 	    $hashref->{"version:$rid"}++;
                   2919: 	    my $version=$hashref->{"version:$rid"};
                   2920: 	    my $allkeys=''; 
                   2921: 	    foreach my $pair (@pairs) {
                   2922: 		my ($key,$value)=split(/=/,$pair);
                   2923: 		$allkeys.=$key.':';
                   2924: 		$hashref->{"$version:$rid:$key"}=$value;
                   2925: 	    }
                   2926: 	    $hashref->{"$version:$rid:timestamp"}=$now;
                   2927: 	    $allkeys.='timestamp';
                   2928: 	    $hashref->{"$version:keys:$rid"}=$allkeys;
1.311     albertel 2929: 	    if (&untie_user_hash($hashref)) {
1.231     foxr     2930: 		&Reply($client, "ok\n", $userinput);
                   2931: 	    } else {
                   2932: 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2933: 			"while attempting store\n", $userinput);
                   2934: 	    }
                   2935: 	} else {
                   2936: 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2937: 		     "while attempting store\n", $userinput);
                   2938: 	}
                   2939:     } else {
                   2940: 	&Failure($client, "refused\n", $userinput);
                   2941:     }
                   2942: 
                   2943:     return 1;
                   2944: }
                   2945: &register_handler("store", \&store_handler, 0, 1, 0);
1.263     albertel 2946: 
1.323     albertel 2947: #  Modify a set of key=value pairs associated with a versioned name.
                   2948: #
                   2949: #  Parameters:
                   2950: #    $cmd                - Request command keyword.
                   2951: #    $tail               - Tail of the request.  This is a colon
                   2952: #                          separated list containing:
                   2953: #                          domain/user - User and authentication domain.
                   2954: #                          namespace   - Name of the database being modified
                   2955: #                          rid         - Resource keyword to modify.
                   2956: #                          v           - Version item to modify
                   2957: #                          what        - new value associated with rid.
                   2958: #
                   2959: #    $client             - Socket open on the client.
                   2960: #
                   2961: #
                   2962: #  Returns:
                   2963: #      1 (keep on processing).
                   2964: #  Side-Effects:
                   2965: #    Writes to the client
                   2966: sub putstore_handler {
                   2967:     my ($cmd, $tail, $client) = @_;
                   2968:  
                   2969:     my $userinput = "$cmd:$tail";
                   2970: 
                   2971:     my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail);
                   2972:     if ($namespace ne 'roles') {
                   2973: 
                   2974: 	chomp($what);
                   2975: 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
                   2976: 				       &GDBM_WRCREAT(), "M",
                   2977: 				       "$rid:$v:$what");
                   2978: 	if ($hashref) {
                   2979: 	    my $now = time;
                   2980: 	    my %data = &hash_extract($what);
                   2981: 	    my @allkeys;
                   2982: 	    while (my($key,$value) = each(%data)) {
                   2983: 		push(@allkeys,$key);
                   2984: 		$hashref->{"$v:$rid:$key"} = $value;
                   2985: 	    }
                   2986: 	    my $allkeys = join(':',@allkeys);
                   2987: 	    $hashref->{"$v:keys:$rid"}=$allkeys;
                   2988: 
                   2989: 	    if (&untie_user_hash($hashref)) {
                   2990: 		&Reply($client, "ok\n", $userinput);
                   2991: 	    } else {
                   2992: 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2993: 			"while attempting store\n", $userinput);
                   2994: 	    }
                   2995: 	} else {
                   2996: 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2997: 		     "while attempting store\n", $userinput);
                   2998: 	}
                   2999:     } else {
                   3000: 	&Failure($client, "refused\n", $userinput);
                   3001:     }
                   3002: 
                   3003:     return 1;
                   3004: }
                   3005: &register_handler("putstore", \&putstore_handler, 0, 1, 0);
                   3006: 
                   3007: sub hash_extract {
                   3008:     my ($str)=@_;
                   3009:     my %hash;
                   3010:     foreach my $pair (split(/\&/,$str)) {
                   3011: 	my ($key,$value)=split(/=/,$pair);
                   3012: 	$hash{$key}=$value;
                   3013:     }
                   3014:     return (%hash);
                   3015: }
                   3016: sub hash_to_str {
                   3017:     my ($hash_ref)=@_;
                   3018:     my $str;
                   3019:     foreach my $key (keys(%$hash_ref)) {
                   3020: 	$str.=$key.'='.$hash_ref->{$key}.'&';
                   3021:     }
                   3022:     $str=~s/\&$//;
                   3023:     return $str;
                   3024: }
                   3025: 
1.231     foxr     3026: #
                   3027: #  Dump out all versions of a resource that has key=value pairs associated
                   3028: # with it for each version.  These resources are built up via the store
                   3029: # command.
                   3030: #
                   3031: #  Parameters:
                   3032: #     $cmd               - Command keyword.
                   3033: #     $tail              - Remainder of the request which consists of:
                   3034: #                          domain/user   - User and auth. domain.
                   3035: #                          namespace     - name of resource database.
                   3036: #                          rid           - Resource id.
                   3037: #    $client             - socket open on the client.
                   3038: #
                   3039: # Returns:
                   3040: #      1  indicating the caller should not yet exit.
                   3041: # Side-effects:
                   3042: #   Writes a reply to the client.
                   3043: #   The reply is a string of the following shape:
                   3044: #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
                   3045: #    Where the 1 above represents version 1.
                   3046: #    this continues for all pairs of keys in all versions.
                   3047: #
                   3048: #
                   3049: #    
                   3050: #
                   3051: sub restore_handler {
                   3052:     my ($cmd, $tail, $client) = @_;
                   3053: 
                   3054:     my $userinput = "$cmd:$tail";	# Only used for logging purposes.
1.351     banghart 3055:     my ($udom,$uname,$namespace,$rid) = split(/:/,$tail);
1.352     albertel 3056:     $namespace=~s/\//\_/g;
1.350     albertel 3057:     $namespace = &LONCAPA::clean_username($namespace);
1.349     albertel 3058: 
1.231     foxr     3059:     chomp($rid);
                   3060:     my $qresult='';
1.309     albertel 3061:     my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
                   3062:     if ($hashref) {
                   3063: 	my $version=$hashref->{"version:$rid"};
1.231     foxr     3064: 	$qresult.="version=$version&";
                   3065: 	my $scope;
                   3066: 	for ($scope=1;$scope<=$version;$scope++) {
1.309     albertel 3067: 	    my $vkeys=$hashref->{"$scope:keys:$rid"};
1.231     foxr     3068: 	    my @keys=split(/:/,$vkeys);
                   3069: 	    my $key;
                   3070: 	    $qresult.="$scope:keys=$vkeys&";
                   3071: 	    foreach $key (@keys) {
1.309     albertel 3072: 		$qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
1.231     foxr     3073: 	    }                                  
                   3074: 	}
1.311     albertel 3075: 	if (&untie_user_hash($hashref)) {
1.231     foxr     3076: 	    $qresult=~s/\&$//;
                   3077: 	    &Reply( $client, "$qresult\n", $userinput);
                   3078: 	} else {
                   3079: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3080: 		    "while attempting restore\n", $userinput);
                   3081: 	}
                   3082:     } else {
                   3083: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3084: 		"while attempting restore\n", $userinput);
                   3085:     }
                   3086:   
                   3087:     return 1;
                   3088: 
                   3089: 
                   3090: }
                   3091: &register_handler("restore", \&restore_handler, 0,1,0);
1.234     foxr     3092: 
                   3093: #
1.324     raeburn  3094: #   Add a chat message to a synchronous discussion board.
1.234     foxr     3095: #
                   3096: # Parameters:
                   3097: #    $cmd                - Request keyword.
                   3098: #    $tail               - Tail of the command. A colon separated list
                   3099: #                          containing:
                   3100: #                          cdom    - Domain on which the chat board lives
1.324     raeburn  3101: #                          cnum    - Course containing the chat board.
                   3102: #                          newpost - Body of the posting.
                   3103: #                          group   - Optional group, if chat board is only 
                   3104: #                                    accessible in a group within the course 
1.234     foxr     3105: #   $client              - Socket open on the client.
                   3106: # Returns:
                   3107: #   1    - Indicating caller should keep on processing.
                   3108: #
                   3109: # Side-effects:
                   3110: #   writes a reply to the client.
                   3111: #
                   3112: #
                   3113: sub send_chat_handler {
                   3114:     my ($cmd, $tail, $client) = @_;
                   3115: 
                   3116:     
                   3117:     my $userinput = "$cmd:$tail";
                   3118: 
1.324     raeburn  3119:     my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail);
                   3120:     &chat_add($cdom,$cnum,$newpost,$group);
1.234     foxr     3121:     &Reply($client, "ok\n", $userinput);
                   3122: 
                   3123:     return 1;
                   3124: }
                   3125: &register_handler("chatsend", \&send_chat_handler, 0, 1, 0);
1.263     albertel 3126: 
1.234     foxr     3127: #
1.324     raeburn  3128: #   Retrieve the set of chat messages from a discussion board.
1.234     foxr     3129: #
                   3130: #  Parameters:
                   3131: #    $cmd             - Command keyword that initiated the request.
                   3132: #    $tail            - Remainder of the request after the command
                   3133: #                       keyword.  In this case a colon separated list of
                   3134: #                       chat domain    - Which discussion board.
                   3135: #                       chat id        - Discussion thread(?)
                   3136: #                       domain/user    - Authentication domain and username
                   3137: #                                        of the requesting person.
1.324     raeburn  3138: #                       group          - Optional course group containing
                   3139: #                                        the board.      
1.234     foxr     3140: #   $client           - Socket open on the client program.
                   3141: # Returns:
                   3142: #    1     - continue processing
                   3143: # Side effects:
                   3144: #    Response is written to the client.
                   3145: #
                   3146: sub retrieve_chat_handler {
                   3147:     my ($cmd, $tail, $client) = @_;
                   3148: 
                   3149: 
                   3150:     my $userinput = "$cmd:$tail";
                   3151: 
1.324     raeburn  3152:     my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
1.234     foxr     3153:     my $reply='';
1.324     raeburn  3154:     foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
1.234     foxr     3155: 	$reply.=&escape($_).':';
                   3156:     }
                   3157:     $reply=~s/\:$//;
                   3158:     &Reply($client, $reply."\n", $userinput);
                   3159: 
                   3160: 
                   3161:     return 1;
                   3162: }
                   3163: &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
                   3164: 
                   3165: #
                   3166: #  Initiate a query of an sql database.  SQL query repsonses get put in
                   3167: #  a file for later retrieval.  This prevents sql query results from
                   3168: #  bottlenecking the system.  Note that with loncnew, perhaps this is
                   3169: #  less of an issue since multiple outstanding requests can be concurrently
                   3170: #  serviced.
                   3171: #
                   3172: #  Parameters:
                   3173: #     $cmd       - COmmand keyword that initiated the request.
                   3174: #     $tail      - Remainder of the command after the keyword.
                   3175: #                  For this function, this consists of a query and
                   3176: #                  3 arguments that are self-documentingly labelled
                   3177: #                  in the original arg1, arg2, arg3.
                   3178: #     $client    - Socket open on the client.
                   3179: # Return:
                   3180: #    1   - Indicating processing should continue.
                   3181: # Side-effects:
                   3182: #    a reply is written to $client.
                   3183: #
                   3184: sub send_query_handler {
                   3185:     my ($cmd, $tail, $client) = @_;
                   3186: 
                   3187: 
                   3188:     my $userinput = "$cmd:$tail";
                   3189: 
                   3190:     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
                   3191:     $query=~s/\n*$//g;
                   3192:     &Reply($client, "". &sql_reply("$clientname\&$query".
                   3193: 				"\&$arg1"."\&$arg2"."\&$arg3")."\n",
                   3194: 	  $userinput);
                   3195:     
                   3196:     return 1;
                   3197: }
                   3198: &register_handler("querysend", \&send_query_handler, 0, 1, 0);
                   3199: 
                   3200: #
                   3201: #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
                   3202: #   The query is submitted via a "querysend" transaction.
                   3203: #   There it is passed on to the lonsql daemon, queued and issued to
                   3204: #   mysql.
                   3205: #     This transaction is invoked when the sql transaction is complete
                   3206: #   it stores the query results in flie and indicates query completion.
                   3207: #   presumably local software then fetches this response... I'm guessing
                   3208: #   the sequence is: lonc does a querysend, we ask lonsql to do it.
                   3209: #   lonsql on completion of the query interacts with the lond of our
                   3210: #   client to do a query reply storing two files:
                   3211: #    - id     - The results of the query.
                   3212: #    - id.end - Indicating the transaction completed. 
                   3213: #    NOTE: id is a unique id assigned to the query and querysend time.
                   3214: # Parameters:
                   3215: #    $cmd        - Command keyword that initiated this request.
                   3216: #    $tail       - Remainder of the tail.  In this case that's a colon
                   3217: #                  separated list containing the query Id and the 
                   3218: #                  results of the query.
                   3219: #    $client     - Socket open on the client.
                   3220: # Return:
                   3221: #    1           - Indicating that we should continue processing.
                   3222: # Side effects:
                   3223: #    ok written to the client.
                   3224: #
                   3225: sub reply_query_handler {
                   3226:     my ($cmd, $tail, $client) = @_;
                   3227: 
                   3228: 
                   3229:     my $userinput = "$cmd:$tail";
                   3230: 
1.339     albertel 3231:     my ($id,$reply)=split(/:/,$tail); 
1.234     foxr     3232:     my $store;
                   3233:     my $execdir=$perlvar{'lonDaemons'};
                   3234:     if ($store=IO::File->new(">$execdir/tmp/$id")) {
                   3235: 	$reply=~s/\&/\n/g;
                   3236: 	print $store $reply;
                   3237: 	close $store;
                   3238: 	my $store2=IO::File->new(">$execdir/tmp/$id.end");
                   3239: 	print $store2 "done\n";
                   3240: 	close $store2;
                   3241: 	&Reply($client, "ok\n", $userinput);
                   3242:     } else {
                   3243: 	&Failure($client, "error: ".($!+0)
                   3244: 		." IO::File->new Failed ".
                   3245: 		"while attempting queryreply\n", $userinput);
                   3246:     }
                   3247:  
                   3248: 
                   3249:     return 1;
                   3250: }
                   3251: &register_handler("queryreply", \&reply_query_handler, 0, 1, 0);
                   3252: 
                   3253: #
                   3254: #  Process the courseidput request.  Not quite sure what this means
                   3255: #  at the system level sense.  It appears a gdbm file in the 
                   3256: #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
                   3257: #  a set of entries made in that database.
                   3258: #
                   3259: # Parameters:
                   3260: #   $cmd      - The command keyword that initiated this request.
                   3261: #   $tail     - Tail of the command.  In this case consists of a colon
                   3262: #               separated list contaning the domain to apply this to and
                   3263: #               an ampersand separated list of keyword=value pairs.
1.272     raeburn  3264: #               Each value is a colon separated list that includes:  
                   3265: #               description, institutional code and course owner.
                   3266: #               For backward compatibility with versions included
                   3267: #               in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
                   3268: #               code and/or course owner are preserved from the existing 
                   3269: #               record when writing a new record in response to 1.1 or 
                   3270: #               1.2 implementations of lonnet::flushcourselogs().   
                   3271: #                      
1.234     foxr     3272: #   $client   - Socket open on the client.
                   3273: # Returns:
                   3274: #   1    - indicating that processing should continue
                   3275: #
                   3276: # Side effects:
                   3277: #   reply is written to the client.
                   3278: #
                   3279: sub put_course_id_handler {
                   3280:     my ($cmd, $tail, $client) = @_;
                   3281: 
                   3282: 
                   3283:     my $userinput = "$cmd:$tail";
                   3284: 
1.266     raeburn  3285:     my ($udom, $what) = split(/:/, $tail,2);
1.234     foxr     3286:     chomp($what);
                   3287:     my $now=time;
                   3288:     my @pairs=split(/\&/,$what);
                   3289: 
                   3290:     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
                   3291:     if ($hashref) {
                   3292: 	foreach my $pair (@pairs) {
1.271     raeburn  3293:             my ($key,$courseinfo) = split(/=/,$pair,2);
                   3294:             $courseinfo =~ s/=/:/g;
1.356     raeburn  3295:             my @current_items = split(/:/,$hashref->{$key},-1);
1.273     albertel 3296:             shift(@current_items); # remove description
                   3297:             pop(@current_items);   # remove last access
1.272     raeburn  3298:             my $numcurrent = scalar(@current_items);
1.356     raeburn  3299:             if ($numcurrent > 3) {
                   3300:                 $numcurrent = 3;
                   3301:             }
                   3302:             my @new_items = split(/:/,$courseinfo,-1);
1.272     raeburn  3303:             my $numnew = scalar(@new_items);
                   3304:             if ($numcurrent > 0) {
1.333     raeburn  3305:                 if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2 
                   3306:                     for (my $j=$numcurrent-$numnew; $j>=0; $j--) {
                   3307:                         $courseinfo .= ':'.$current_items[$numcurrent-$j-1];
                   3308:                     }
1.272     raeburn  3309:                 }
                   3310:             }
1.266     raeburn  3311: 	    $hashref->{$key}=$courseinfo.':'.$now;
1.234     foxr     3312: 	}
1.311     albertel 3313: 	if (&untie_domain_hash($hashref)) {
1.253     foxr     3314: 	    &Reply( $client, "ok\n", $userinput);
1.234     foxr     3315: 	} else {
1.253     foxr     3316: 	    &Failure($client, "error: ".($!+0)
1.234     foxr     3317: 		     ." untie(GDBM) Failed ".
                   3318: 		     "while attempting courseidput\n", $userinput);
                   3319: 	}
                   3320:     } else {
1.253     foxr     3321: 	&Failure($client, "error: ".($!+0)
1.234     foxr     3322: 		 ." tie(GDBM) Failed ".
                   3323: 		 "while attempting courseidput\n", $userinput);
                   3324:     }
1.253     foxr     3325:     
1.234     foxr     3326: 
                   3327:     return 1;
                   3328: }
                   3329: &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
                   3330: 
                   3331: #  Retrieves the value of a course id resource keyword pattern
                   3332: #  defined since a starting date.  Both the starting date and the
                   3333: #  keyword pattern are optional.  If the starting date is not supplied it
                   3334: #  is treated as the beginning of time.  If the pattern is not found,
                   3335: #  it is treatred as "." matching everything.
                   3336: #
                   3337: #  Parameters:
                   3338: #     $cmd     - Command keyword that resulted in us being dispatched.
                   3339: #     $tail    - The remainder of the command that, in this case, consists
                   3340: #                of a colon separated list of:
                   3341: #                 domain   - The domain in which the course database is 
                   3342: #                            defined.
                   3343: #                 since    - Optional parameter describing the minimum
                   3344: #                            time of definition(?) of the resources that
                   3345: #                            will match the dump.
                   3346: #                 description - regular expression that is used to filter
                   3347: #                            the dump.  Only keywords matching this regexp
                   3348: #                            will be used.
1.272     raeburn  3349: #                 institutional code - optional supplied code to filter 
                   3350: #                            the dump. Only courses with an institutional code 
                   3351: #                            that match the supplied code will be returned.
1.336     raeburn  3352: #                 owner    - optional supplied username and domain of owner to
                   3353: #                            filter the dump.  Only courses for which the course
                   3354: #                            owner matches the supplied username and/or domain
                   3355: #                            will be returned. Pre-2.2.0 legacy entries from 
                   3356: #                            nohist_courseiddump will only contain usernames.
1.234     foxr     3357: #     $client  - The socket open on the client.
                   3358: # Returns:
                   3359: #    1     - Continue processing.
                   3360: # Side Effects:
                   3361: #   a reply is written to $client.
                   3362: sub dump_course_id_handler {
                   3363:     my ($cmd, $tail, $client) = @_;
                   3364: 
                   3365:     my $userinput = "$cmd:$tail";
                   3366: 
1.333     raeburn  3367:     my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
1.344     raeburn  3368:         $typefilter,$regexp_ok) =split(/:/,$tail);
1.234     foxr     3369:     if (defined($description)) {
                   3370: 	$description=&unescape($description);
                   3371:     } else {
                   3372: 	$description='.';
                   3373:     }
1.266     raeburn  3374:     if (defined($instcodefilter)) {
                   3375:         $instcodefilter=&unescape($instcodefilter);
                   3376:     } else {
                   3377:         $instcodefilter='.';
                   3378:     }
1.336     raeburn  3379:     my ($ownerunamefilter,$ownerdomfilter);
1.266     raeburn  3380:     if (defined($ownerfilter)) {
                   3381:         $ownerfilter=&unescape($ownerfilter);
1.336     raeburn  3382:         if ($ownerfilter ne '.' && defined($ownerfilter)) {
                   3383:             if ($ownerfilter =~ /^([^:]*):([^:]*)$/) {
                   3384:                  $ownerunamefilter = $1;
                   3385:                  $ownerdomfilter = $2;
                   3386:             } else {
                   3387:                 $ownerunamefilter = $ownerfilter;
                   3388:                 $ownerdomfilter = '';
                   3389:             }
                   3390:         }
1.266     raeburn  3391:     } else {
                   3392:         $ownerfilter='.';
                   3393:     }
1.336     raeburn  3394: 
1.282     raeburn  3395:     if (defined($coursefilter)) {
                   3396:         $coursefilter=&unescape($coursefilter);
                   3397:     } else {
                   3398:         $coursefilter='.';
                   3399:     }
1.333     raeburn  3400:     if (defined($typefilter)) {
                   3401:         $typefilter=&unescape($typefilter);
                   3402:     } else {
                   3403:         $typefilter='.';
                   3404:     }
1.344     raeburn  3405:     if (defined($regexp_ok)) {
                   3406:         $regexp_ok=&unescape($regexp_ok);
                   3407:     }
1.266     raeburn  3408: 
1.234     foxr     3409:     unless (defined($since)) { $since=0; }
                   3410:     my $qresult='';
                   3411:     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
                   3412:     if ($hashref) {
                   3413: 	while (my ($key,$value) = each(%$hashref)) {
1.333     raeburn  3414: 	    my ($descr,$lasttime,$inst_code,$owner,$type);
1.274     albertel 3415:             my @courseitems = split(/:/,$value);
                   3416:             $lasttime = pop(@courseitems);
1.333     raeburn  3417: 	    ($descr,$inst_code,$owner,$type)=@courseitems;
1.234     foxr     3418: 	    if ($lasttime<$since) { next; }
1.266     raeburn  3419:             my $match = 1;
                   3420: 	    unless ($description eq '.') {
                   3421: 		my $unescapeDescr = &unescape($descr);
                   3422: 		unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
                   3423:                     $match = 0;
1.234     foxr     3424: 		}
1.266     raeburn  3425:             }
                   3426:             unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
                   3427:                 my $unescapeInstcode = &unescape($inst_code);
1.344     raeburn  3428:                 if ($regexp_ok) {
                   3429:                     unless (eval('$unescapeInstcode=~/$instcodefilter/')) {
                   3430:                         $match = 0;
                   3431:                     }
                   3432:                 } else {
                   3433:                     unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
                   3434:                         $match = 0;
                   3435:                     }
1.266     raeburn  3436:                 }
1.234     foxr     3437: 	    }
1.266     raeburn  3438:             unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
                   3439:                 my $unescapeOwner = &unescape($owner);
1.336     raeburn  3440:                 if (($ownerunamefilter ne '') && ($ownerdomfilter ne '')) {
                   3441:                     if ($unescapeOwner =~ /:/) {
                   3442:                         if (eval('$unescapeOwner !~ 
                   3443:                              /\Q$ownerunamefilter\E:\Q$ownerdomfilter\E$/i')) {
                   3444:                             $match = 0;
                   3445:                         } 
                   3446:                     } else {
                   3447:                         if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E/i')) {
                   3448:                             $match = 0;
                   3449:                         }
                   3450:                     }
                   3451:                 } elsif ($ownerunamefilter ne '') {
                   3452:                     if ($unescapeOwner =~ /:/) {
                   3453:                         if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E:[^:]+$/i')) {
                   3454:                              $match = 0;
                   3455:                         }
                   3456:                     } else {
                   3457:                         if (eval('$unescapeOwner!~/\Q$ownerunamefilter\E/i')) {
                   3458:                             $match = 0;
                   3459:                         }
                   3460:                     }
                   3461:                 } elsif ($ownerdomfilter ne '') {
                   3462:                     if ($unescapeOwner =~ /:/) {
                   3463:                         if (eval('$unescapeOwner!~/^[^:]+:\Q$ownerdomfilter\E/')) {
                   3464:                              $match = 0;
                   3465:                         }
                   3466:                     } else {
                   3467:                         if ($ownerdomfilter ne $udom) {
                   3468:                             $match = 0;
                   3469:                         }
                   3470:                     }
1.266     raeburn  3471:                 }
                   3472:             }
1.282     raeburn  3473:             unless ($coursefilter eq '.' || !defined($coursefilter)) {
                   3474:                 my $unescapeCourse = &unescape($key);
                   3475:                 unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
                   3476:                     $match = 0;
                   3477:                 }
                   3478:             }
1.333     raeburn  3479:             unless ($typefilter eq '.' || !defined($typefilter)) {
                   3480:                 my $unescapeType = &unescape($type);
1.342     albertel 3481:                 if ($type eq '') {
1.333     raeburn  3482:                     if ($typefilter ne 'Course') {
                   3483:                         $match = 0;
                   3484:                     }
                   3485:                 } else { 
                   3486:                     unless (eval('$unescapeType=~/^\Q$typefilter\E$/')) {
                   3487:                         $match = 0;
                   3488:                     }
                   3489:                 }
                   3490:             }
1.266     raeburn  3491:             if ($match == 1) {
                   3492:                 $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
                   3493:             }
1.234     foxr     3494: 	}
1.311     albertel 3495: 	if (&untie_domain_hash($hashref)) {
1.234     foxr     3496: 	    chop($qresult);
                   3497: 	    &Reply($client, "$qresult\n", $userinput);
                   3498: 	} else {
                   3499: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3500: 		    "while attempting courseiddump\n", $userinput);
                   3501: 	}
                   3502:     } else {
                   3503: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3504: 		"while attempting courseiddump\n", $userinput);
                   3505:     }
                   3506: 
                   3507: 
                   3508:     return 1;
                   3509: }
                   3510: &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
1.238     foxr     3511: 
                   3512: #
1.348     raeburn  3513: # Puts an unencrypted entry in a namespace db file at the domain level 
                   3514: #
                   3515: # Parameters:
                   3516: #    $cmd      - The command that got us here.
                   3517: #    $tail     - Tail of the command (remaining parameters).
                   3518: #    $client   - File descriptor connected to client.
                   3519: # Returns
                   3520: #     0        - Requested to exit, caller should shut down.
                   3521: #     1        - Continue processing.
                   3522: #  Side effects:
                   3523: #     reply is written to $client.
                   3524: #
                   3525: sub put_domain_handler {
                   3526:     my ($cmd,$tail,$client) = @_;
                   3527: 
                   3528:     my $userinput = "$cmd:$tail";
                   3529: 
                   3530:     my ($udom,$namespace,$what) =split(/:/,$tail,3);
                   3531:     chomp($what);
                   3532:     my @pairs=split(/\&/,$what);
                   3533:     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_WRCREAT(),
                   3534:                                    "P", $what);
                   3535:     if ($hashref) {
                   3536:         foreach my $pair (@pairs) {
                   3537:             my ($key,$value)=split(/=/,$pair);
                   3538:             $hashref->{$key}=$value;
                   3539:         }
                   3540:         if (&untie_domain_hash($hashref)) {
                   3541:             &Reply($client, "ok\n", $userinput);
                   3542:         } else {
                   3543:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3544:                      "while attempting putdom\n", $userinput);
                   3545:         }
                   3546:     } else {
                   3547:         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3548:                   "while attempting putdom\n", $userinput);
                   3549:     }
                   3550: 
                   3551:     return 1;
                   3552: }
                   3553: &register_handler("putdom", \&put_domain_handler, 0, 1, 0);
                   3554: 
                   3555: # Unencrypted get from the namespace database file at the domain level.
                   3556: # This function retrieves a keyed item from a specific named database in the
                   3557: # domain directory.
                   3558: #
                   3559: # Parameters:
                   3560: #   $cmd             - Command request keyword (get).
                   3561: #   $tail            - Tail of the command.  This is a colon separated list
                   3562: #                      consisting of the domain and the 'namespace' 
                   3563: #                      which selects the gdbm file to do the lookup in,
                   3564: #                      & separated list of keys to lookup.  Note that
                   3565: #                      the values are returned as an & separated list too.
                   3566: #   $client          - File descriptor open on the client.
                   3567: # Returns:
                   3568: #   1       - Continue processing.
                   3569: #   0       - Exit.
                   3570: #  Side effects:
                   3571: #     reply is written to $client.
                   3572: #
                   3573: 
                   3574: sub get_domain_handler {
                   3575:     my ($cmd, $tail, $client) = @_;
                   3576: 
                   3577:     my $userinput = "$client:$tail";
                   3578: 
                   3579:     my ($udom,$namespace,$what)=split(/:/,$tail,3);
                   3580:     chomp($what);
                   3581:     my @queries=split(/\&/,$what);
                   3582:     my $qresult='';
                   3583:     my $hashref = &tie_domain_hash($udom, "$namespace", &GDBM_READER());
                   3584:     if ($hashref) {
                   3585:         for (my $i=0;$i<=$#queries;$i++) {
                   3586:             $qresult.="$hashref->{$queries[$i]}&";
                   3587:         }
                   3588:         if (&untie_domain_hash($hashref)) {
                   3589:             $qresult=~s/\&$//;
                   3590:             &Reply($client, "$qresult\n", $userinput);
                   3591:         } else {
                   3592:             &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3593:                       "while attempting getdom\n",$userinput);
                   3594:         }
                   3595:     } else {
                   3596:         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3597:                  "while attempting getdom\n",$userinput);
                   3598:     }
                   3599: 
                   3600:     return 1;
                   3601: }
1.360   ! raeburn  3602: &register_handler("getdom", \&get_domain_handler, 0, 1, 0);
1.348     raeburn  3603: 
                   3604: 
                   3605: #
1.238     foxr     3606: #  Puts an id to a domains id database. 
                   3607: #
                   3608: #  Parameters:
                   3609: #   $cmd     - The command that triggered us.
                   3610: #   $tail    - Remainder of the request other than the command. This is a 
                   3611: #              colon separated list containing:
                   3612: #              $domain  - The domain for which we are writing the id.
                   3613: #              $pairs  - The id info to write... this is and & separated list
                   3614: #                        of keyword=value.
                   3615: #   $client  - Socket open on the client.
                   3616: #  Returns:
                   3617: #    1   - Continue processing.
                   3618: #  Side effects:
                   3619: #     reply is written to $client.
                   3620: #
                   3621: sub put_id_handler {
                   3622:     my ($cmd,$tail,$client) = @_;
                   3623: 
                   3624: 
                   3625:     my $userinput = "$cmd:$tail";
                   3626: 
                   3627:     my ($udom,$what)=split(/:/,$tail);
                   3628:     chomp($what);
                   3629:     my @pairs=split(/\&/,$what);
                   3630:     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
                   3631: 				   "P", $what);
                   3632:     if ($hashref) {
                   3633: 	foreach my $pair (@pairs) {
                   3634: 	    my ($key,$value)=split(/=/,$pair);
                   3635: 	    $hashref->{$key}=$value;
                   3636: 	}
1.311     albertel 3637: 	if (&untie_domain_hash($hashref)) {
1.238     foxr     3638: 	    &Reply($client, "ok\n", $userinput);
                   3639: 	} else {
                   3640: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3641: 		     "while attempting idput\n", $userinput);
                   3642: 	}
                   3643:     } else {
                   3644: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3645: 		  "while attempting idput\n", $userinput);
                   3646:     }
                   3647: 
                   3648:     return 1;
                   3649: }
1.263     albertel 3650: &register_handler("idput", \&put_id_handler, 0, 1, 0);
1.238     foxr     3651: 
                   3652: #
                   3653: #  Retrieves a set of id values from the id database.
                   3654: #  Returns an & separated list of results, one for each requested id to the
                   3655: #  client.
                   3656: #
                   3657: # Parameters:
                   3658: #   $cmd       - Command keyword that caused us to be dispatched.
                   3659: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3660: #               domain - the domain whose id table we dump
                   3661: #               ids      Consists of an & separated list of
                   3662: #                        id keywords whose values will be fetched.
                   3663: #                        nonexisting keywords will have an empty value.
                   3664: #   $client    - Socket open on the client.
                   3665: #
                   3666: # Returns:
                   3667: #    1 - indicating processing should continue.
                   3668: # Side effects:
                   3669: #   An & separated list of results is written to $client.
                   3670: #
                   3671: sub get_id_handler {
                   3672:     my ($cmd, $tail, $client) = @_;
                   3673: 
                   3674:     
                   3675:     my $userinput = "$client:$tail";
                   3676:     
                   3677:     my ($udom,$what)=split(/:/,$tail);
                   3678:     chomp($what);
                   3679:     my @queries=split(/\&/,$what);
                   3680:     my $qresult='';
                   3681:     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
                   3682:     if ($hashref) {
                   3683: 	for (my $i=0;$i<=$#queries;$i++) {
                   3684: 	    $qresult.="$hashref->{$queries[$i]}&";
                   3685: 	}
1.311     albertel 3686: 	if (&untie_domain_hash($hashref)) {
1.238     foxr     3687: 	    $qresult=~s/\&$//;
                   3688: 	    &Reply($client, "$qresult\n", $userinput);
                   3689: 	} else {
                   3690: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3691: 		      "while attempting idget\n",$userinput);
                   3692: 	}
                   3693:     } else {
                   3694: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3695: 		 "while attempting idget\n",$userinput);
                   3696:     }
                   3697:     
                   3698:     return 1;
                   3699: }
1.263     albertel 3700: &register_handler("idget", \&get_id_handler, 0, 1, 0);
1.238     foxr     3701: 
                   3702: #
1.299     raeburn  3703: # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database 
                   3704: #
                   3705: # Parameters
                   3706: #   $cmd       - Command keyword that caused us to be dispatched.
                   3707: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3708: #               domain - the domain whose dcmail we are recording
                   3709: #               email    Consists of key=value pair 
                   3710: #                        where key is unique msgid
                   3711: #                        and value is message (in XML)
                   3712: #   $client    - Socket open on the client.
                   3713: #
                   3714: # Returns:
                   3715: #    1 - indicating processing should continue.
                   3716: # Side effects
                   3717: #     reply is written to $client.
                   3718: #
                   3719: sub put_dcmail_handler {
                   3720:     my ($cmd,$tail,$client) = @_;
                   3721:     my $userinput = "$cmd:$tail";
                   3722:                                                                                 
                   3723:     my ($udom,$what)=split(/:/,$tail);
                   3724:     chomp($what);
                   3725:     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
                   3726:     if ($hashref) {
                   3727:         my ($key,$value)=split(/=/,$what);
                   3728:         $hashref->{$key}=$value;
                   3729:     }
1.311     albertel 3730:     if (&untie_domain_hash($hashref)) {
1.299     raeburn  3731:         &Reply($client, "ok\n", $userinput);
                   3732:     } else {
                   3733:         &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3734:                  "while attempting dcmailput\n", $userinput);
                   3735:     }
                   3736:     return 1;
                   3737: }
                   3738: &register_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
                   3739: 
                   3740: #
                   3741: # Retrieves broadcast e-mail from nohist_dcmail database
                   3742: # Returns to client an & separated list of key=value pairs,
                   3743: # where key is msgid and value is message information.
                   3744: #
                   3745: # Parameters
                   3746: #   $cmd       - Command keyword that caused us to be dispatched.
                   3747: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3748: #               domain - the domain whose dcmail table we dump
                   3749: #               startfilter - beginning of time window 
                   3750: #               endfilter - end of time window
                   3751: #               sendersfilter - & separated list of username:domain 
                   3752: #                 for senders to search for.
                   3753: #   $client    - Socket open on the client.
                   3754: #
                   3755: # Returns:
                   3756: #    1 - indicating processing should continue.
                   3757: # Side effects
                   3758: #     reply (& separated list of msgid=messageinfo pairs) is 
                   3759: #     written to $client.
                   3760: #
                   3761: sub dump_dcmail_handler {
                   3762:     my ($cmd, $tail, $client) = @_;
                   3763:                                                                                 
                   3764:     my $userinput = "$cmd:$tail";
                   3765:     my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
                   3766:     chomp($sendersfilter);
                   3767:     my @senders = ();
                   3768:     if (defined($startfilter)) {
                   3769:         $startfilter=&unescape($startfilter);
                   3770:     } else {
                   3771:         $startfilter='.';
                   3772:     }
                   3773:     if (defined($endfilter)) {
                   3774:         $endfilter=&unescape($endfilter);
                   3775:     } else {
                   3776:         $endfilter='.';
                   3777:     }
                   3778:     if (defined($sendersfilter)) {
                   3779:         $sendersfilter=&unescape($sendersfilter);
1.300     albertel 3780: 	@senders = map { &unescape($_) } split(/\&/,$sendersfilter);
1.299     raeburn  3781:     }
                   3782: 
                   3783:     my $qresult='';
                   3784:     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
                   3785:     if ($hashref) {
                   3786:         while (my ($key,$value) = each(%$hashref)) {
                   3787:             my $match = 1;
1.303     albertel 3788:             my ($timestamp,$subj,$uname,$udom) = 
                   3789: 		split(/:/,&unescape(&unescape($key)),5); # yes, twice really
1.299     raeburn  3790:             $subj = &unescape($subj);
                   3791:             unless ($startfilter eq '.' || !defined($startfilter)) {
                   3792:                 if ($timestamp < $startfilter) {
                   3793:                     $match = 0;
                   3794:                 }
                   3795:             }
                   3796:             unless ($endfilter eq '.' || !defined($endfilter)) {
                   3797:                 if ($timestamp > $endfilter) {
                   3798:                     $match = 0;
                   3799:                 }
                   3800:             }
                   3801:             unless (@senders < 1) {
                   3802:                 unless (grep/^$uname:$udom$/,@senders) {
                   3803:                     $match = 0;
                   3804:                 }
                   3805:             }
                   3806:             if ($match == 1) {
                   3807:                 $qresult.=$key.'='.$value.'&';
                   3808:             }
                   3809:         }
1.311     albertel 3810:         if (&untie_domain_hash($hashref)) {
1.299     raeburn  3811:             chop($qresult);
                   3812:             &Reply($client, "$qresult\n", $userinput);
                   3813:         } else {
                   3814:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3815:                     "while attempting dcmaildump\n", $userinput);
                   3816:         }
                   3817:     } else {
                   3818:         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3819:                 "while attempting dcmaildump\n", $userinput);
                   3820:     }
                   3821:     return 1;
                   3822: }
                   3823: 
                   3824: &register_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
                   3825: 
                   3826: #
                   3827: # Puts domain roles in nohist_domainroles database
                   3828: #
                   3829: # Parameters
                   3830: #   $cmd       - Command keyword that caused us to be dispatched.
                   3831: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3832: #               domain - the domain whose roles we are recording  
                   3833: #               role -   Consists of key=value pair
                   3834: #                        where key is unique role
                   3835: #                        and value is start/end date information
                   3836: #   $client    - Socket open on the client.
                   3837: #
                   3838: # Returns:
                   3839: #    1 - indicating processing should continue.
                   3840: # Side effects
                   3841: #     reply is written to $client.
                   3842: #
                   3843: 
                   3844: sub put_domainroles_handler {
                   3845:     my ($cmd,$tail,$client) = @_;
                   3846: 
                   3847:     my $userinput = "$cmd:$tail";
                   3848:     my ($udom,$what)=split(/:/,$tail);
                   3849:     chomp($what);
                   3850:     my @pairs=split(/\&/,$what);
                   3851:     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
                   3852:     if ($hashref) {
                   3853:         foreach my $pair (@pairs) {
                   3854:             my ($key,$value)=split(/=/,$pair);
                   3855:             $hashref->{$key}=$value;
                   3856:         }
1.311     albertel 3857:         if (&untie_domain_hash($hashref)) {
1.299     raeburn  3858:             &Reply($client, "ok\n", $userinput);
                   3859:         } else {
                   3860:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3861:                      "while attempting domroleput\n", $userinput);
                   3862:         }
                   3863:     } else {
                   3864:         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3865:                   "while attempting domroleput\n", $userinput);
                   3866:     }
                   3867:                                                                                   
                   3868:     return 1;
                   3869: }
                   3870: 
                   3871: &register_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
                   3872: 
                   3873: #
                   3874: # Retrieves domain roles from nohist_domainroles database
                   3875: # Returns to client an & separated list of key=value pairs,
                   3876: # where key is role and value is start and end date information.
                   3877: #
                   3878: # Parameters
                   3879: #   $cmd       - Command keyword that caused us to be dispatched.
                   3880: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3881: #               domain - the domain whose domain roles table we dump
                   3882: #   $client    - Socket open on the client.
                   3883: #
                   3884: # Returns:
                   3885: #    1 - indicating processing should continue.
                   3886: # Side effects
                   3887: #     reply (& separated list of role=start/end info pairs) is
                   3888: #     written to $client.
                   3889: #
                   3890: sub dump_domainroles_handler {
                   3891:     my ($cmd, $tail, $client) = @_;
                   3892:                                                                                            
                   3893:     my $userinput = "$cmd:$tail";
                   3894:     my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
                   3895:     chomp($rolesfilter);
                   3896:     my @roles = ();
                   3897:     if (defined($startfilter)) {
                   3898:         $startfilter=&unescape($startfilter);
                   3899:     } else {
                   3900:         $startfilter='.';
                   3901:     }
                   3902:     if (defined($endfilter)) {
                   3903:         $endfilter=&unescape($endfilter);
                   3904:     } else {
                   3905:         $endfilter='.';
                   3906:     }
                   3907:     if (defined($rolesfilter)) {
                   3908:         $rolesfilter=&unescape($rolesfilter);
1.300     albertel 3909: 	@roles = split(/\&/,$rolesfilter);
1.299     raeburn  3910:     }
                   3911:                                                                                            
                   3912:     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
                   3913:     if ($hashref) {
                   3914:         my $qresult = '';
                   3915:         while (my ($key,$value) = each(%$hashref)) {
                   3916:             my $match = 1;
                   3917:             my ($start,$end) = split(/:/,&unescape($value));
                   3918:             my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
                   3919:             unless ($startfilter eq '.' || !defined($startfilter)) {
                   3920:                 if ($start >= $startfilter) {
                   3921:                     $match = 0;
                   3922:                 }
                   3923:             }
                   3924:             unless ($endfilter eq '.' || !defined($endfilter)) {
                   3925:                 if ($end <= $endfilter) {
                   3926:                     $match = 0;
                   3927:                 }
                   3928:             }
                   3929:             unless (@roles < 1) {
                   3930:                 unless (grep/^$trole$/,@roles) {
                   3931:                     $match = 0;
                   3932:                 }
                   3933:             }
                   3934:             if ($match == 1) {
                   3935:                 $qresult.=$key.'='.$value.'&';
                   3936:             }
                   3937:         }
1.311     albertel 3938:         if (&untie_domain_hash($hashref)) {
1.299     raeburn  3939:             chop($qresult);
                   3940:             &Reply($client, "$qresult\n", $userinput);
                   3941:         } else {
                   3942:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3943:                     "while attempting domrolesdump\n", $userinput);
                   3944:         }
                   3945:     } else {
                   3946:         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3947:                 "while attempting domrolesdump\n", $userinput);
                   3948:     }
                   3949:     return 1;
                   3950: }
                   3951: 
                   3952: &register_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
                   3953: 
                   3954: 
1.238     foxr     3955: #  Process the tmpput command I'm not sure what this does.. Seems to
                   3956: #  create a file in the lonDaemons/tmp directory of the form $id.tmp
                   3957: # where Id is the client's ip concatenated with a sequence number.
                   3958: # The file will contain some value that is passed in.  Is this e.g.
                   3959: # a login token?
                   3960: #
                   3961: # Parameters:
                   3962: #    $cmd     - The command that got us dispatched.
                   3963: #    $tail    - The remainder of the request following $cmd:
                   3964: #               In this case this will be the contents of the file.
                   3965: #    $client  - Socket connected to the client.
                   3966: # Returns:
                   3967: #    1 indicating processing can continue.
                   3968: # Side effects:
                   3969: #   A file is created in the local filesystem.
                   3970: #   A reply is sent to the client.
                   3971: sub tmp_put_handler {
                   3972:     my ($cmd, $what, $client) = @_;
                   3973: 
                   3974:     my $userinput = "$cmd:$what";	# Reconstruct for logging.
                   3975: 
1.347     raeburn  3976:     my ($record,$context) = split(/:/,$what);
                   3977:     if ($context ne '') {
                   3978:         chomp($context);
                   3979:         $context = &unescape($context);
                   3980:     }
                   3981:     my ($id,$store);
1.238     foxr     3982:     $tmpsnum++;
1.347     raeburn  3983:     if ($context eq 'resetpw') {
                   3984:         $id = &md5_hex(&md5_hex(time.{}.rand().$$));
                   3985:     } else {
                   3986:         $id = $$.'_'.$clientip.'_'.$tmpsnum;
                   3987:     }
1.238     foxr     3988:     $id=~s/\W/\_/g;
1.347     raeburn  3989:     $record=~s/\n//g;
1.238     foxr     3990:     my $execdir=$perlvar{'lonDaemons'};
                   3991:     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1.347     raeburn  3992: 	print $store $record;
1.238     foxr     3993: 	close $store;
                   3994: 	&Reply($client, "$id\n", $userinput);
                   3995:     } else {
                   3996: 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                   3997: 		  "while attempting tmpput\n", $userinput);
                   3998:     }
                   3999:     return 1;
                   4000:   
                   4001: }
                   4002: &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
1.263     albertel 4003: 
1.238     foxr     4004: #   Processes the tmpget command.  This command returns the contents
                   4005: #  of a temporary resource file(?) created via tmpput.
                   4006: #
                   4007: # Paramters:
                   4008: #    $cmd      - Command that got us dispatched.
                   4009: #    $id       - Tail of the command, contain the id of the resource
                   4010: #                we want to fetch.
                   4011: #    $client   - socket open on the client.
                   4012: # Return:
                   4013: #    1         - Inidcating processing can continue.
                   4014: # Side effects:
                   4015: #   A reply is sent to the client.
                   4016: #
                   4017: sub tmp_get_handler {
                   4018:     my ($cmd, $id, $client) = @_;
                   4019: 
                   4020:     my $userinput = "$cmd:$id"; 
                   4021:     
                   4022: 
                   4023:     $id=~s/\W/\_/g;
                   4024:     my $store;
                   4025:     my $execdir=$perlvar{'lonDaemons'};
                   4026:     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
                   4027: 	my $reply=<$store>;
                   4028: 	&Reply( $client, "$reply\n", $userinput);
                   4029: 	close $store;
                   4030:     } else {
                   4031: 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                   4032: 		  "while attempting tmpget\n", $userinput);
                   4033:     }
                   4034: 
                   4035:     return 1;
                   4036: }
                   4037: &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
1.263     albertel 4038: 
1.238     foxr     4039: #
                   4040: #  Process the tmpdel command.  This command deletes a temp resource
                   4041: #  created by the tmpput command.
                   4042: #
                   4043: # Parameters:
                   4044: #   $cmd      - Command that got us here.
                   4045: #   $id       - Id of the temporary resource created.
                   4046: #   $client   - socket open on the client process.
                   4047: #
                   4048: # Returns:
                   4049: #   1     - Indicating processing should continue.
                   4050: # Side Effects:
                   4051: #   A file is deleted
                   4052: #   A reply is sent to the client.
                   4053: sub tmp_del_handler {
                   4054:     my ($cmd, $id, $client) = @_;
                   4055:     
                   4056:     my $userinput= "$cmd:$id";
                   4057:     
                   4058:     chomp($id);
                   4059:     $id=~s/\W/\_/g;
                   4060:     my $execdir=$perlvar{'lonDaemons'};
                   4061:     if (unlink("$execdir/tmp/$id.tmp")) {
                   4062: 	&Reply($client, "ok\n", $userinput);
                   4063:     } else {
                   4064: 	&Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
                   4065: 		  "while attempting tmpdel\n", $userinput);
                   4066:     }
                   4067:     
                   4068:     return 1;
                   4069: 
                   4070: }
                   4071: &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
1.263     albertel 4072: 
1.238     foxr     4073: #
1.246     foxr     4074: #   Processes the setannounce command.  This command
                   4075: #   creates a file named announce.txt in the top directory of
                   4076: #   the documentn root and sets its contents.  The announce.txt file is
                   4077: #   printed in its entirety at the LonCAPA login page.  Note:
                   4078: #   once the announcement.txt fileis created it cannot be deleted.
                   4079: #   However, setting the contents of the file to empty removes the
                   4080: #   announcement from the login page of loncapa so who cares.
                   4081: #
                   4082: # Parameters:
                   4083: #    $cmd          - The command that got us dispatched.
                   4084: #    $announcement - The text of the announcement.
                   4085: #    $client       - Socket open on the client process.
                   4086: # Retunrns:
                   4087: #   1             - Indicating request processing should continue
                   4088: # Side Effects:
                   4089: #   The file {DocRoot}/announcement.txt is created.
                   4090: #   A reply is sent to $client.
                   4091: #
                   4092: sub set_announce_handler {
                   4093:     my ($cmd, $announcement, $client) = @_;
                   4094:   
                   4095:     my $userinput    = "$cmd:$announcement";
                   4096: 
                   4097:     chomp($announcement);
                   4098:     $announcement=&unescape($announcement);
                   4099:     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
                   4100: 				'/announcement.txt')) {
                   4101: 	print $store $announcement;
                   4102: 	close $store;
                   4103: 	&Reply($client, "ok\n", $userinput);
                   4104:     } else {
                   4105: 	&Failure($client, "error: ".($!+0)."\n", $userinput);
                   4106:     }
                   4107: 
                   4108:     return 1;
                   4109: }
                   4110: &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
1.263     albertel 4111: 
1.246     foxr     4112: #
                   4113: #  Return the version of the daemon.  This can be used to determine
                   4114: #  the compatibility of cross version installations or, alternatively to
                   4115: #  simply know who's out of date and who isn't.  Note that the version
                   4116: #  is returned concatenated with the tail.
                   4117: # Parameters:
                   4118: #   $cmd        - the request that dispatched to us.
                   4119: #   $tail       - Tail of the request (client's version?).
                   4120: #   $client     - Socket open on the client.
                   4121: #Returns:
                   4122: #   1 - continue processing requests.
                   4123: # Side Effects:
                   4124: #   Replies with version to $client.
                   4125: sub get_version_handler {
                   4126:     my ($cmd, $tail, $client) = @_;
                   4127: 
                   4128:     my $userinput  = $cmd.$tail;
                   4129:     
                   4130:     &Reply($client, &version($userinput)."\n", $userinput);
                   4131: 
                   4132: 
                   4133:     return 1;
                   4134: }
                   4135: &register_handler("version", \&get_version_handler, 0, 1, 0);
1.263     albertel 4136: 
1.246     foxr     4137: #  Set the current host and domain.  This is used to support
                   4138: #  multihomed systems.  Each IP of the system, or even separate daemons
                   4139: #  on the same IP can be treated as handling a separate lonCAPA virtual
                   4140: #  machine.  This command selects the virtual lonCAPA.  The client always
                   4141: #  knows the right one since it is lonc and it is selecting the domain/system
                   4142: #  from the hosts.tab file.
                   4143: # Parameters:
                   4144: #    $cmd      - Command that dispatched us.
                   4145: #    $tail     - Tail of the command (domain/host requested).
                   4146: #    $socket   - Socket open on the client.
                   4147: #
                   4148: # Returns:
                   4149: #     1   - Indicates the program should continue to process requests.
                   4150: # Side-effects:
                   4151: #     The default domain/system context is modified for this daemon.
                   4152: #     a reply is sent to the client.
                   4153: #
                   4154: sub set_virtual_host_handler {
                   4155:     my ($cmd, $tail, $socket) = @_;
                   4156:   
                   4157:     my $userinput  ="$cmd:$tail";
                   4158: 
                   4159:     &Reply($client, &sethost($userinput)."\n", $userinput);
                   4160: 
                   4161: 
                   4162:     return 1;
                   4163: }
1.247     albertel 4164: &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
1.246     foxr     4165: 
                   4166: #  Process a request to exit:
                   4167: #   - "bye" is sent to the client.
                   4168: #   - The client socket is shutdown and closed.
                   4169: #   - We indicate to the caller that we should exit.
                   4170: # Formal Parameters:
                   4171: #   $cmd                - The command that got us here.
                   4172: #   $tail               - Tail of the command (empty).
                   4173: #   $client             - Socket open on the tail.
                   4174: # Returns:
                   4175: #   0      - Indicating the program should exit!!
                   4176: #
                   4177: sub exit_handler {
                   4178:     my ($cmd, $tail, $client) = @_;
                   4179: 
                   4180:     my $userinput = "$cmd:$tail";
                   4181: 
                   4182:     &logthis("Client $clientip ($clientname) hanging up: $userinput");
                   4183:     &Reply($client, "bye\n", $userinput);
                   4184:     $client->shutdown(2);        # shutdown the socket forcibly.
                   4185:     $client->close();
                   4186: 
                   4187:     return 0;
                   4188: }
1.248     foxr     4189: &register_handler("exit", \&exit_handler, 0,1,1);
                   4190: &register_handler("init", \&exit_handler, 0,1,1);
                   4191: &register_handler("quit", \&exit_handler, 0,1,1);
                   4192: 
                   4193: #  Determine if auto-enrollment is enabled.
                   4194: #  Note that the original had what I believe to be a defect.
                   4195: #  The original returned 0 if the requestor was not a registerd client.
                   4196: #  It should return "refused".
                   4197: # Formal Parameters:
                   4198: #   $cmd       - The command that invoked us.
                   4199: #   $tail      - The tail of the command (Extra command parameters.
                   4200: #   $client    - The socket open on the client that issued the request.
                   4201: # Returns:
                   4202: #    1         - Indicating processing should continue.
                   4203: #
                   4204: sub enrollment_enabled_handler {
                   4205:     my ($cmd, $tail, $client) = @_;
                   4206:     my $userinput = $cmd.":".$tail; # For logging purposes.
                   4207: 
                   4208:     
1.337     albertel 4209:     my ($cdom) = split(/:/, $tail, 2);   # Domain we're asking about.
                   4210: 
1.248     foxr     4211:     my $outcome  = &localenroll::run($cdom);
                   4212:     &Reply($client, "$outcome\n", $userinput);
                   4213: 
                   4214:     return 1;
                   4215: }
                   4216: &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
                   4217: 
                   4218: #   Get the official sections for which auto-enrollment is possible.
                   4219: #   Since the admin people won't know about 'unofficial sections' 
                   4220: #   we cannot auto-enroll on them.
                   4221: # Formal Parameters:
                   4222: #    $cmd     - The command request that got us dispatched here.
                   4223: #    $tail    - The remainder of the request.  In our case this
                   4224: #               will be split into:
                   4225: #               $coursecode   - The course name from the admin point of view.
                   4226: #               $cdom         - The course's domain(?).
                   4227: #    $client  - Socket open on the client.
                   4228: # Returns:
                   4229: #    1    - Indiciting processing should continue.
                   4230: #
                   4231: sub get_sections_handler {
                   4232:     my ($cmd, $tail, $client) = @_;
                   4233:     my $userinput = "$cmd:$tail";
                   4234: 
                   4235:     my ($coursecode, $cdom) = split(/:/, $tail);
                   4236:     my @secs = &localenroll::get_sections($coursecode,$cdom);
                   4237:     my $seclist = &escape(join(':',@secs));
                   4238: 
                   4239:     &Reply($client, "$seclist\n", $userinput);
                   4240:     
                   4241: 
                   4242:     return 1;
                   4243: }
                   4244: &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
                   4245: 
                   4246: #   Validate the owner of a new course section.  
                   4247: #
                   4248: # Formal Parameters:
                   4249: #   $cmd      - Command that got us dispatched.
                   4250: #   $tail     - the remainder of the command.  For us this consists of a
                   4251: #               colon separated string containing:
                   4252: #                  $inst    - Course Id from the institutions point of view.
                   4253: #                  $owner   - Proposed owner of the course.
                   4254: #                  $cdom    - Domain of the course (from the institutions
                   4255: #                             point of view?)..
                   4256: #   $client   - Socket open on the client.
                   4257: #
                   4258: # Returns:
                   4259: #   1        - Processing should continue.
                   4260: #
                   4261: sub validate_course_owner_handler {
                   4262:     my ($cmd, $tail, $client)  = @_;
                   4263:     my $userinput = "$cmd:$tail";
                   4264:     my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
                   4265: 
1.336     raeburn  4266:     $owner = &unescape($owner);
1.248     foxr     4267:     my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
                   4268:     &Reply($client, "$outcome\n", $userinput);
                   4269: 
                   4270: 
                   4271: 
                   4272:     return 1;
                   4273: }
                   4274: &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
1.263     albertel 4275: 
1.248     foxr     4276: #
                   4277: #   Validate a course section in the official schedule of classes
                   4278: #   from the institutions point of view (part of autoenrollment).
                   4279: #
                   4280: # Formal Parameters:
                   4281: #   $cmd          - The command request that got us dispatched.
                   4282: #   $tail         - The tail of the command.  In this case,
                   4283: #                   this is a colon separated set of words that will be split
                   4284: #                   into:
                   4285: #                        $inst_course_id - The course/section id from the
                   4286: #                                          institutions point of view.
                   4287: #                        $cdom           - The domain from the institutions
                   4288: #                                          point of view.
                   4289: #   $client       - Socket open on the client.
                   4290: # Returns:
                   4291: #    1           - Indicating processing should continue.
                   4292: #
                   4293: sub validate_course_section_handler {
                   4294:     my ($cmd, $tail, $client) = @_;
                   4295:     my $userinput = "$cmd:$tail";
                   4296:     my ($inst_course_id, $cdom) = split(/:/, $tail);
                   4297: 
                   4298:     my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
                   4299:     &Reply($client, "$outcome\n", $userinput);
                   4300: 
                   4301: 
                   4302:     return 1;
                   4303: }
                   4304: &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
                   4305: 
                   4306: #
1.340     raeburn  4307: #   Validate course owner's access to enrollment data for specific class section. 
                   4308: #   
                   4309: #
                   4310: # Formal Parameters:
                   4311: #    $cmd     - The command request that got us dispatched.
                   4312: #    $tail    - The tail of the command.   In this case this is a colon separated
                   4313: #               set of words that will be split into:
                   4314: #               $inst_class  - Institutional code for the specific class section   
                   4315: #               $courseowner - The escaped username:domain of the course owner 
                   4316: #               $cdom        - The domain of the course from the institution's
                   4317: #                              point of view.
                   4318: #    $client  - The socket open on the client.
                   4319: # Returns:
                   4320: #    1 - continue processing.
                   4321: #
                   4322: 
                   4323: sub validate_class_access_handler {
                   4324:     my ($cmd, $tail, $client) = @_;
                   4325:     my $userinput = "$cmd:$tail";
                   4326:     my ($inst_class,$courseowner,$cdom) = split(/:/, $tail);
                   4327:     $courseowner = &unescape($courseowner);
1.341     albertel 4328:     my $outcome;
                   4329:     eval {
                   4330: 	local($SIG{__DIE__})='DEFAULT';
                   4331: 	$outcome=&localenroll::check_section($inst_class,$courseowner,$cdom);
                   4332:     };
1.340     raeburn  4333:     &Reply($client,"$outcome\n", $userinput);
                   4334: 
                   4335:     return 1;
                   4336: }
                   4337: &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
                   4338: 
                   4339: #
                   4340: #   Create a password for a new LON-CAPA user added by auto-enrollment.
                   4341: #   Only used for case where authentication method for new user is localauth
1.248     foxr     4342: #
                   4343: # Formal Parameters:
                   4344: #    $cmd     - The command request that got us dispatched.
                   4345: #    $tail    - The tail of the command.   In this case this is a colon separated
                   4346: #               set of words that will be split into:
1.340     raeburn  4347: #               $authparam - An authentication parameter (localauth parameter).
1.248     foxr     4348: #               $cdom      - The domain of the course from the institution's
                   4349: #                            point of view.
                   4350: #    $client  - The socket open on the client.
                   4351: # Returns:
                   4352: #    1 - continue processing.
                   4353: #
                   4354: sub create_auto_enroll_password_handler {
                   4355:     my ($cmd, $tail, $client) = @_;
                   4356:     my $userinput = "$cmd:$tail";
                   4357: 
                   4358:     my ($authparam, $cdom) = split(/:/, $userinput);
                   4359: 
                   4360:     my ($create_passwd,$authchk);
                   4361:     ($authparam,
                   4362:      $create_passwd,
                   4363:      $authchk) = &localenroll::create_password($authparam,$cdom);
                   4364: 
                   4365:     &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
                   4366: 	   $userinput);
                   4367: 
                   4368: 
                   4369:     return 1;
                   4370: }
                   4371: &register_handler("autocreatepassword", \&create_auto_enroll_password_handler, 
                   4372: 		  0, 1, 0);
                   4373: 
                   4374: #   Retrieve and remove temporary files created by/during autoenrollment.
                   4375: #
                   4376: # Formal Parameters:
                   4377: #    $cmd      - The command that got us dispatched.
                   4378: #    $tail     - The tail of the command.  In our case this is a colon 
                   4379: #                separated list that will be split into:
                   4380: #                $filename - The name of the file to remove.
                   4381: #                            The filename is given as a path relative to
                   4382: #                            the LonCAPA temp file directory.
                   4383: #    $client   - Socket open on the client.
                   4384: #
                   4385: # Returns:
                   4386: #   1     - Continue processing.
                   4387: sub retrieve_auto_file_handler {
                   4388:     my ($cmd, $tail, $client)    = @_;
                   4389:     my $userinput                = "cmd:$tail";
                   4390: 
                   4391:     my ($filename)   = split(/:/, $tail);
                   4392: 
                   4393:     my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
                   4394:     if ( (-e $source) && ($filename ne '') ) {
                   4395: 	my $reply = '';
                   4396: 	if (open(my $fh,$source)) {
                   4397: 	    while (<$fh>) {
                   4398: 		chomp($_);
                   4399: 		$_ =~ s/^\s+//g;
                   4400: 		$_ =~ s/\s+$//g;
                   4401: 		$reply .= $_;
                   4402: 	    }
                   4403: 	    close($fh);
                   4404: 	    &Reply($client, &escape($reply)."\n", $userinput);
                   4405: 
                   4406: #   Does this have to be uncommented??!?  (RF).
                   4407: #
                   4408: #                                unlink($source);
                   4409: 	} else {
                   4410: 	    &Failure($client, "error\n", $userinput);
                   4411: 	}
                   4412:     } else {
                   4413: 	&Failure($client, "error\n", $userinput);
                   4414:     }
                   4415:     
                   4416: 
                   4417:     return 1;
                   4418: }
                   4419: &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
                   4420: 
                   4421: #
                   4422: #   Read and retrieve institutional code format (for support form).
                   4423: # Formal Parameters:
                   4424: #    $cmd        - Command that dispatched us.
                   4425: #    $tail       - Tail of the command.  In this case it conatins 
                   4426: #                  the course domain and the coursename.
                   4427: #    $client     - Socket open on the client.
                   4428: # Returns:
                   4429: #    1     - Continue processing.
                   4430: #
                   4431: sub get_institutional_code_format_handler {
                   4432:     my ($cmd, $tail, $client)   = @_;
                   4433:     my $userinput               = "$cmd:$tail";
                   4434: 
                   4435:     my $reply;
                   4436:     my($cdom,$course) = split(/:/,$tail);
                   4437:     my @pairs = split/\&/,$course;
                   4438:     my %instcodes = ();
                   4439:     my %codes = ();
                   4440:     my @codetitles = ();
                   4441:     my %cat_titles = ();
                   4442:     my %cat_order = ();
                   4443:     foreach (@pairs) {
                   4444: 	my ($key,$value) = split/=/,$_;
                   4445: 	$instcodes{&unescape($key)} = &unescape($value);
                   4446:     }
                   4447:     my $formatreply = &localenroll::instcode_format($cdom,
                   4448: 						    \%instcodes,
                   4449: 						    \%codes,
                   4450: 						    \@codetitles,
                   4451: 						    \%cat_titles,
                   4452: 						    \%cat_order);
                   4453:     if ($formatreply eq 'ok') {
                   4454: 	my $codes_str = &hash2str(%codes);
                   4455: 	my $codetitles_str = &array2str(@codetitles);
                   4456: 	my $cat_titles_str = &hash2str(%cat_titles);
                   4457: 	my $cat_order_str = &hash2str(%cat_order);
                   4458: 	&Reply($client,
                   4459: 	       $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
                   4460: 	       .$cat_order_str."\n",
                   4461: 	       $userinput);
                   4462:     } else {
                   4463: 	# this else branch added by RF since if not ok, lonc will
                   4464: 	# hang waiting on reply until timeout.
                   4465: 	#
                   4466: 	&Reply($client, "format_error\n", $userinput);
                   4467:     }
                   4468:     
                   4469:     return 1;
                   4470: }
1.265     albertel 4471: &register_handler("autoinstcodeformat",
                   4472: 		  \&get_institutional_code_format_handler,0,1,0);
1.246     foxr     4473: 
1.345     raeburn  4474: sub get_institutional_defaults_handler {
                   4475:     my ($cmd, $tail, $client)   = @_;
                   4476:     my $userinput               = "$cmd:$tail";
                   4477: 
                   4478:     my $dom = $tail;
                   4479:     my %defaults_hash;
                   4480:     my @code_order;
                   4481:     my $outcome;
                   4482:     eval {
                   4483:         local($SIG{__DIE__})='DEFAULT';
                   4484:         $outcome = &localenroll::instcode_defaults($dom,\%defaults_hash,
                   4485:                                                    \@code_order);
                   4486:     };
                   4487:     if (!$@) {
                   4488:         if ($outcome eq 'ok') {
                   4489:             my $result='';
                   4490:             while (my ($key,$value) = each(%defaults_hash)) {
                   4491:                 $result.=&escape($key).'='.&escape($value).'&';
                   4492:             }
                   4493:             $result .= 'code_order='.&escape(join('&',@code_order));
                   4494:             &Reply($client,$result."\n",$userinput);
                   4495:         } else {
                   4496:             &Reply($client,"error\n", $userinput);
                   4497:         }
                   4498:     } else {
                   4499:         &Failure($client,"unknown_cmd\n",$userinput);
                   4500:     }
                   4501: }
                   4502: &register_handler("autoinstcodedefaults",
                   4503:                   \&get_institutional_defaults_handler,0,1,0);
                   4504: 
                   4505: 
1.317     raeburn  4506: # Get domain specific conditions for import of student photographs to a course
                   4507: #
                   4508: # Retrieves information from photo_permission subroutine in localenroll.
                   4509: # Returns outcome (ok) if no processing errors, and whether course owner is 
                   4510: # required to accept conditions of use (yes/no).
                   4511: #
                   4512: #    
                   4513: sub photo_permission_handler {
                   4514:     my ($cmd, $tail, $client)   = @_;
                   4515:     my $userinput               = "$cmd:$tail";
                   4516:     my $cdom = $tail;
                   4517:     my ($perm_reqd,$conditions);
1.320     albertel 4518:     my $outcome;
                   4519:     eval {
                   4520: 	local($SIG{__DIE__})='DEFAULT';
                   4521: 	$outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
                   4522: 						  \$conditions);
                   4523:     };
                   4524:     if (!$@) {
                   4525: 	&Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
                   4526: 	       $userinput);
                   4527:     } else {
                   4528: 	&Failure($client,"unknown_cmd\n",$userinput);
                   4529:     }
                   4530:     return 1;
1.317     raeburn  4531: }
                   4532: &register_handler("autophotopermission",\&photo_permission_handler,0,1,0);
                   4533: 
                   4534: #
                   4535: # Checks if student photo is available for a user in the domain, in the user's
                   4536: # directory (in /userfiles/internal/studentphoto.jpg).
                   4537: # Uses localstudentphoto:fetch() to ensure there is an up to date copy of
                   4538: # the student's photo.   
                   4539: 
                   4540: sub photo_check_handler {
                   4541:     my ($cmd, $tail, $client)   = @_;
                   4542:     my $userinput               = "$cmd:$tail";
                   4543:     my ($udom,$uname,$pid) = split(/:/,$tail);
                   4544:     $udom = &unescape($udom);
                   4545:     $uname = &unescape($uname);
                   4546:     $pid = &unescape($pid);
                   4547:     my $path=&propath($udom,$uname).'/userfiles/internal/';
                   4548:     if (!-e $path) {
                   4549:         &mkpath($path);
                   4550:     }
                   4551:     my $response;
                   4552:     my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
                   4553:     $result .= ':'.$response;
                   4554:     &Reply($client, &escape($result)."\n",$userinput);
1.320     albertel 4555:     return 1;
1.317     raeburn  4556: }
                   4557: &register_handler("autophotocheck",\&photo_check_handler,0,1,0);
                   4558: 
                   4559: #
                   4560: # Retrieve information from localenroll about whether to provide a button     
                   4561: # for users who have enbled import of student photos to initiate an 
                   4562: # update of photo files for registered students. Also include 
                   4563: # comment to display alongside button.  
                   4564: 
                   4565: sub photo_choice_handler {
                   4566:     my ($cmd, $tail, $client) = @_;
                   4567:     my $userinput             = "$cmd:$tail";
                   4568:     my $cdom                  = &unescape($tail);
1.320     albertel 4569:     my ($update,$comment);
                   4570:     eval {
                   4571: 	local($SIG{__DIE__})='DEFAULT';
                   4572: 	($update,$comment)    = &localenroll::manager_photo_update($cdom);
                   4573:     };
                   4574:     if (!$@) {
                   4575: 	&Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput);
                   4576:     } else {
                   4577: 	&Failure($client,"unknown_cmd\n",$userinput);
                   4578:     }
                   4579:     return 1;
1.317     raeburn  4580: }
                   4581: &register_handler("autophotochoice",\&photo_choice_handler,0,1,0);
                   4582: 
1.265     albertel 4583: #
                   4584: # Gets a student's photo to exist (in the correct image type) in the user's 
                   4585: # directory.
                   4586: # Formal Parameters:
                   4587: #    $cmd     - The command request that got us dispatched.
                   4588: #    $tail    - A colon separated set of words that will be split into:
                   4589: #               $domain - student's domain
                   4590: #               $uname  - student username
                   4591: #               $type   - image type desired
                   4592: #    $client  - The socket open on the client.
                   4593: # Returns:
                   4594: #    1 - continue processing.
1.317     raeburn  4595: 
1.265     albertel 4596: sub student_photo_handler {
                   4597:     my ($cmd, $tail, $client) = @_;
1.317     raeburn  4598:     my ($domain,$uname,$ext,$type) = split(/:/, $tail);
1.265     albertel 4599: 
1.317     raeburn  4600:     my $path=&propath($domain,$uname). '/userfiles/internal/';
                   4601:     my $filename = 'studentphoto.'.$ext;
                   4602:     if ($type eq 'thumbnail') {
                   4603:         $filename = 'studentphoto_tn.'.$ext;
                   4604:     }
                   4605:     if (-e $path.$filename) {
1.265     albertel 4606: 	&Reply($client,"ok\n","$cmd:$tail");
                   4607: 	return 1;
                   4608:     }
                   4609:     &mkpath($path);
1.317     raeburn  4610:     my $file;
                   4611:     if ($type eq 'thumbnail') {
1.320     albertel 4612: 	eval {
                   4613: 	    local($SIG{__DIE__})='DEFAULT';
                   4614: 	    $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
                   4615: 	};
1.317     raeburn  4616:     } else {
                   4617:         $file=&localstudentphoto::fetch($domain,$uname);
                   4618:     }
1.265     albertel 4619:     if (!$file) {
                   4620: 	&Failure($client,"unavailable\n","$cmd:$tail");
                   4621: 	return 1;
                   4622:     }
1.317     raeburn  4623:     if (!-e $path.$filename) { &convert_photo($file,$path.$filename); }
                   4624:     if (-e $path.$filename) {
1.265     albertel 4625: 	&Reply($client,"ok\n","$cmd:$tail");
                   4626: 	return 1;
                   4627:     }
                   4628:     &Failure($client,"unable_to_convert\n","$cmd:$tail");
                   4629:     return 1;
                   4630: }
                   4631: &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
1.246     foxr     4632: 
1.264     albertel 4633: # mkpath makes all directories for a file, expects an absolute path with a
                   4634: # file or a trailing / if just a dir is passed
                   4635: # returns 1 on success 0 on failure
                   4636: sub mkpath {
                   4637:     my ($file)=@_;
                   4638:     my @parts=split(/\//,$file,-1);
                   4639:     my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
                   4640:     for (my $i=3;$i<= ($#parts-1);$i++) {
1.265     albertel 4641: 	$now.='/'.$parts[$i]; 
1.264     albertel 4642: 	if (!-e $now) {
                   4643: 	    if  (!mkdir($now,0770)) { return 0; }
                   4644: 	}
                   4645:     }
                   4646:     return 1;
                   4647: }
                   4648: 
1.207     foxr     4649: #---------------------------------------------------------------
                   4650: #
                   4651: #   Getting, decoding and dispatching requests:
                   4652: #
                   4653: #
                   4654: #   Get a Request:
                   4655: #   Gets a Request message from the client.  The transaction
                   4656: #   is defined as a 'line' of text.  We remove the new line
                   4657: #   from the text line.  
1.226     foxr     4658: #
1.211     albertel 4659: sub get_request {
1.207     foxr     4660:     my $input = <$client>;
                   4661:     chomp($input);
1.226     foxr     4662: 
1.234     foxr     4663:     &Debug("get_request: Request = $input\n");
1.207     foxr     4664: 
                   4665:     &status('Processing '.$clientname.':'.$input);
                   4666: 
                   4667:     return $input;
                   4668: }
1.212     foxr     4669: #---------------------------------------------------------------
                   4670: #
                   4671: #  Process a request.  This sub should shrink as each action
                   4672: #  gets farmed out into a separat sub that is registered 
                   4673: #  with the dispatch hash.  
                   4674: #
                   4675: # Parameters:
                   4676: #    user_input   - The request received from the client (lonc).
                   4677: # Returns:
                   4678: #    true to keep processing, false if caller should exit.
                   4679: #
                   4680: sub process_request {
                   4681:     my ($userinput) = @_;      # Easier for now to break style than to
                   4682:                                 # fix all the userinput -> user_input.
                   4683:     my $wasenc    = 0;		# True if request was encrypted.
                   4684: # ------------------------------------------------------------ See if encrypted
1.322     albertel 4685:     # for command
                   4686:     # sethost:<server>
                   4687:     # <command>:<args>
                   4688:     #   we just send it to the processor
                   4689:     # for
                   4690:     # sethost:<server>:<command>:<args>
                   4691:     #  we do the implict set host and then do the command
                   4692:     if ($userinput =~ /^sethost:/) {
                   4693: 	(my $cmd,my $newid,$userinput) = split(':',$userinput,3);
                   4694: 	if (defined($userinput)) {
                   4695: 	    &sethost("$cmd:$newid");
                   4696: 	} else {
                   4697: 	    $userinput = "$cmd:$newid";
                   4698: 	}
                   4699:     }
                   4700: 
1.212     foxr     4701:     if ($userinput =~ /^enc/) {
                   4702: 	$userinput = decipher($userinput);
                   4703: 	$wasenc=1;
                   4704: 	if(!$userinput) {	# Cipher not defined.
1.251     foxr     4705: 	    &Failure($client, "error: Encrypted data without negotated key\n");
1.212     foxr     4706: 	    return 0;
                   4707: 	}
                   4708:     }
                   4709:     Debug("process_request: $userinput\n");
                   4710:     
1.213     foxr     4711:     #  
                   4712:     #   The 'correct way' to add a command to lond is now to
                   4713:     #   write a sub to execute it and Add it to the command dispatch
                   4714:     #   hash via a call to register_handler..  The comments to that
                   4715:     #   sub should give you enough to go on to show how to do this
                   4716:     #   along with the examples that are building up as this code
                   4717:     #   is getting refactored.   Until all branches of the
                   4718:     #   if/elseif monster below have been factored out into
                   4719:     #   separate procesor subs, if the dispatch hash is missing
                   4720:     #   the command keyword, we will fall through to the remainder
                   4721:     #   of the if/else chain below in order to keep this thing in 
                   4722:     #   working order throughout the transmogrification.
                   4723: 
                   4724:     my ($command, $tail) = split(/:/, $userinput, 2);
                   4725:     chomp($command);
                   4726:     chomp($tail);
                   4727:     $tail =~ s/(\r)//;		# This helps people debugging with e.g. telnet.
1.214     foxr     4728:     $command =~ s/(\r)//;	# And this too for parameterless commands.
                   4729:     if(!$tail) {
                   4730: 	$tail ="";		# defined but blank.
                   4731:     }
1.213     foxr     4732: 
                   4733:     &Debug("Command received: $command, encoded = $wasenc");
                   4734: 
                   4735:     if(defined $Dispatcher{$command}) {
                   4736: 
                   4737: 	my $dispatch_info = $Dispatcher{$command};
                   4738: 	my $handler       = $$dispatch_info[0];
                   4739: 	my $need_encode   = $$dispatch_info[1];
                   4740: 	my $client_types  = $$dispatch_info[2];
                   4741: 	Debug("Matched dispatch hash: mustencode: $need_encode "
                   4742: 	      ."ClientType $client_types");
                   4743:       
                   4744: 	#  Validate the request:
                   4745:       
                   4746: 	my $ok = 1;
                   4747: 	my $requesterprivs = 0;
                   4748: 	if(&isClient()) {
                   4749: 	    $requesterprivs |= $CLIENT_OK;
                   4750: 	}
                   4751: 	if(&isManager()) {
                   4752: 	    $requesterprivs |= $MANAGER_OK;
                   4753: 	}
                   4754: 	if($need_encode && (!$wasenc)) {
                   4755: 	    Debug("Must encode but wasn't: $need_encode $wasenc");
                   4756: 	    $ok = 0;
                   4757: 	}
                   4758: 	if(($client_types & $requesterprivs) == 0) {
                   4759: 	    Debug("Client not privileged to do this operation");
                   4760: 	    $ok = 0;
                   4761: 	}
                   4762: 
                   4763: 	if($ok) {
                   4764: 	    Debug("Dispatching to handler $command $tail");
                   4765: 	    my $keep_going = &$handler($command, $tail, $client);
                   4766: 	    return $keep_going;
                   4767: 	} else {
                   4768: 	    Debug("Refusing to dispatch because client did not match requirements");
                   4769: 	    Failure($client, "refused\n", $userinput);
                   4770: 	    return 1;
                   4771: 	}
                   4772: 
                   4773:     }    
                   4774: 
1.262     foxr     4775:     print $client "unknown_cmd\n";
1.212     foxr     4776: # -------------------------------------------------------------------- complete
                   4777:     Debug("process_request - returning 1");
                   4778:     return 1;
                   4779: }
1.207     foxr     4780: #
                   4781: #   Decipher encoded traffic
                   4782: #  Parameters:
                   4783: #     input      - Encoded data.
                   4784: #  Returns:
                   4785: #     Decoded data or undef if encryption key was not yet negotiated.
                   4786: #  Implicit input:
                   4787: #     cipher  - This global holds the negotiated encryption key.
                   4788: #
1.211     albertel 4789: sub decipher {
1.207     foxr     4790:     my ($input)  = @_;
                   4791:     my $output = '';
1.212     foxr     4792:     
                   4793:     
1.207     foxr     4794:     if($cipher) {
                   4795: 	my($enc, $enclength, $encinput) = split(/:/, $input);
                   4796: 	for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
                   4797: 	    $output .= 
                   4798: 		$cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
                   4799: 	}
                   4800: 	return substr($output, 0, $enclength);
                   4801:     } else {
                   4802: 	return undef;
                   4803:     }
                   4804: }
                   4805: 
                   4806: #
                   4807: #   Register a command processor.  This function is invoked to register a sub
                   4808: #   to process a request.  Once registered, the ProcessRequest sub can automatically
                   4809: #   dispatch requests to an appropriate sub, and do the top level validity checking
                   4810: #   as well:
                   4811: #    - Is the keyword recognized.
                   4812: #    - Is the proper client type attempting the request.
                   4813: #    - Is the request encrypted if it has to be.
                   4814: #   Parameters:
                   4815: #    $request_name         - Name of the request being registered.
                   4816: #                           This is the command request that will match
                   4817: #                           against the hash keywords to lookup the information
                   4818: #                           associated with the dispatch information.
                   4819: #    $procedure           - Reference to a sub to call to process the request.
                   4820: #                           All subs get called as follows:
                   4821: #                             Procedure($cmd, $tail, $replyfd, $key)
                   4822: #                             $cmd    - the actual keyword that invoked us.
                   4823: #                             $tail   - the tail of the request that invoked us.
                   4824: #                             $replyfd- File descriptor connected to the client
                   4825: #    $must_encode          - True if the request must be encoded to be good.
                   4826: #    $client_ok            - True if it's ok for a client to request this.
                   4827: #    $manager_ok           - True if it's ok for a manager to request this.
                   4828: # Side effects:
                   4829: #      - On success, the Dispatcher hash has an entry added for the key $RequestName
                   4830: #      - On failure, the program will die as it's a bad internal bug to try to 
                   4831: #        register a duplicate command handler.
                   4832: #
1.211     albertel 4833: sub register_handler {
1.212     foxr     4834:     my ($request_name,$procedure,$must_encode,	$client_ok,$manager_ok)   = @_;
1.207     foxr     4835: 
                   4836:     #  Don't allow duplication#
                   4837:    
                   4838:     if (defined $Dispatcher{$request_name}) {
                   4839: 	die "Attempting to define a duplicate request handler for $request_name\n";
                   4840:     }
                   4841:     #   Build the client type mask:
                   4842:     
                   4843:     my $client_type_mask = 0;
                   4844:     if($client_ok) {
                   4845: 	$client_type_mask  |= $CLIENT_OK;
                   4846:     }
                   4847:     if($manager_ok) {
                   4848: 	$client_type_mask  |= $MANAGER_OK;
                   4849:     }
                   4850:    
                   4851:     #  Enter the hash:
                   4852:       
                   4853:     my @entry = ($procedure, $must_encode, $client_type_mask);
                   4854:    
                   4855:     $Dispatcher{$request_name} = \@entry;
                   4856:    
                   4857: }
                   4858: 
                   4859: 
                   4860: #------------------------------------------------------------------
                   4861: 
                   4862: 
                   4863: 
                   4864: 
1.141     foxr     4865: #
1.96      foxr     4866: #  Convert an error return code from lcpasswd to a string value.
                   4867: #
                   4868: sub lcpasswdstrerror {
                   4869:     my $ErrorCode = shift;
1.97      foxr     4870:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96      foxr     4871: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
                   4872:     } else {
1.98      foxr     4873: 	return $passwderrors[$ErrorCode];
1.96      foxr     4874:     }
                   4875: }
                   4876: 
1.97      foxr     4877: #
                   4878: # Convert an error return code from lcuseradd to a string value:
                   4879: #
                   4880: sub lcuseraddstrerror {
                   4881:     my $ErrorCode = shift;
                   4882:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
                   4883: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
                   4884:     } else {
1.98      foxr     4885: 	return $adderrors[$ErrorCode];
1.97      foxr     4886:     }
                   4887: }
                   4888: 
1.23      harris41 4889: # grabs exception and records it to log before exiting
                   4890: sub catchexception {
1.27      albertel 4891:     my ($error)=@_;
1.25      www      4892:     $SIG{'QUIT'}='DEFAULT';
                   4893:     $SIG{__DIE__}='DEFAULT';
1.165     albertel 4894:     &status("Catching exception");
1.190     albertel 4895:     &logthis("<font color='red'>CRITICAL: "
1.134     albertel 4896:      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
1.27      albertel 4897:      ."a crash with this error msg->[$error]</font>");
1.57      www      4898:     &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27      albertel 4899:     if ($client) { print $client "error: $error\n"; }
1.59      www      4900:     $server->close();
1.27      albertel 4901:     die($error);
1.23      harris41 4902: }
1.63      www      4903: sub timeout {
1.165     albertel 4904:     &status("Handling Timeout");
1.190     albertel 4905:     &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
1.63      www      4906:     &catchexception('Timeout');
                   4907: }
1.22      harris41 4908: # -------------------------------- Set signal handlers to record abnormal exits
                   4909: 
1.226     foxr     4910: 
1.22      harris41 4911: $SIG{'QUIT'}=\&catchexception;
                   4912: $SIG{__DIE__}=\&catchexception;
                   4913: 
1.81      matthew  4914: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95      harris41 4915: &status("Read loncapa.conf and loncapa_apache.conf");
                   4916: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141     foxr     4917: %perlvar=%{$perlvarref};
1.80      harris41 4918: undef $perlvarref;
1.19      www      4919: 
1.35      harris41 4920: # ----------------------------- Make sure this process is running from user=www
                   4921: my $wwwid=getpwnam('www');
                   4922: if ($wwwid!=$<) {
1.134     albertel 4923:    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   4924:    my $subj="LON: $currenthostid User ID mismatch";
1.37      harris41 4925:    system("echo 'User ID mismatch.  lond must be run as user www.' |\
1.35      harris41 4926:  mailto $emailto -s '$subj' > /dev/null");
                   4927:    exit 1;
                   4928: }
                   4929: 
1.19      www      4930: # --------------------------------------------- Check if other instance running
                   4931: 
                   4932: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
                   4933: 
                   4934: if (-e $pidfile) {
                   4935:    my $lfh=IO::File->new("$pidfile");
                   4936:    my $pide=<$lfh>;
                   4937:    chomp($pide);
1.29      harris41 4938:    if (kill 0 => $pide) { die "already running"; }
1.19      www      4939: }
1.1       albertel 4940: 
                   4941: # ------------------------------------------------------------- Read hosts file
                   4942: 
                   4943: 
                   4944: 
                   4945: # establish SERVER socket, bind and listen.
                   4946: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                   4947:                                 Type      => SOCK_STREAM,
                   4948:                                 Proto     => 'tcp',
                   4949:                                 Reuse     => 1,
                   4950:                                 Listen    => 10 )
1.29      harris41 4951:   or die "making socket: $@\n";
1.1       albertel 4952: 
                   4953: # --------------------------------------------------------- Do global variables
                   4954: 
                   4955: # global variables
                   4956: 
1.134     albertel 4957: my %children               = ();       # keys are current child process IDs
1.1       albertel 4958: 
                   4959: sub REAPER {                        # takes care of dead children
                   4960:     $SIG{CHLD} = \&REAPER;
1.165     albertel 4961:     &status("Handling child death");
1.178     foxr     4962:     my $pid;
                   4963:     do {
                   4964: 	$pid = waitpid(-1,&WNOHANG());
                   4965: 	if (defined($children{$pid})) {
                   4966: 	    &logthis("Child $pid died");
                   4967: 	    delete($children{$pid});
1.183     albertel 4968: 	} elsif ($pid > 0) {
1.178     foxr     4969: 	    &logthis("Unknown Child $pid died");
                   4970: 	}
                   4971:     } while ( $pid > 0 );
                   4972:     foreach my $child (keys(%children)) {
                   4973: 	$pid = waitpid($child,&WNOHANG());
                   4974: 	if ($pid > 0) {
                   4975: 	    &logthis("Child $child - $pid looks like we missed it's death");
                   4976: 	    delete($children{$pid});
                   4977: 	}
1.176     albertel 4978:     }
1.165     albertel 4979:     &status("Finished Handling child death");
1.1       albertel 4980: }
                   4981: 
                   4982: sub HUNTSMAN {                      # signal handler for SIGINT
1.165     albertel 4983:     &status("Killing children (INT)");
1.1       albertel 4984:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                   4985:     kill 'INT' => keys %children;
1.59      www      4986:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1       albertel 4987:     my $execdir=$perlvar{'lonDaemons'};
                   4988:     unlink("$execdir/logs/lond.pid");
1.190     albertel 4989:     &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.165     albertel 4990:     &status("Done killing children");
1.1       albertel 4991:     exit;                           # clean up with dignity
                   4992: }
                   4993: 
                   4994: sub HUPSMAN {                      # signal handler for SIGHUP
                   4995:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
1.165     albertel 4996:     &status("Killing children for restart (HUP)");
1.1       albertel 4997:     kill 'INT' => keys %children;
1.59      www      4998:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.190     albertel 4999:     &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.134     albertel 5000:     my $execdir=$perlvar{'lonDaemons'};
1.30      harris41 5001:     unlink("$execdir/logs/lond.pid");
1.165     albertel 5002:     &status("Restarting self (HUP)");
1.1       albertel 5003:     exec("$execdir/lond");         # here we go again
                   5004: }
                   5005: 
1.144     foxr     5006: #
1.148     foxr     5007: #    Kill off hashes that describe the host table prior to re-reading it.
                   5008: #    Hashes affected are:
1.200     matthew  5009: #       %hostid, %hostdom %hostip %hostdns.
1.148     foxr     5010: #
                   5011: sub KillHostHashes {
                   5012:     foreach my $key (keys %hostid) {
                   5013: 	delete $hostid{$key};
                   5014:     }
                   5015:     foreach my $key (keys %hostdom) {
                   5016: 	delete $hostdom{$key};
                   5017:     }
                   5018:     foreach my $key (keys %hostip) {
                   5019: 	delete $hostip{$key};
                   5020:     }
1.200     matthew  5021:     foreach my $key (keys %hostdns) {
                   5022: 	delete $hostdns{$key};
                   5023:     }
1.148     foxr     5024: }
                   5025: #
                   5026: #   Read in the host table from file and distribute it into the various hashes:
                   5027: #
                   5028: #    - %hostid  -  Indexed by IP, the loncapa hostname.
                   5029: #    - %hostdom -  Indexed by  loncapa hostname, the domain.
                   5030: #    - %hostip  -  Indexed by hostid, the Ip address of the host.
                   5031: sub ReadHostTable {
                   5032: 
                   5033:     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
1.200     matthew  5034:     my $myloncapaname = $perlvar{'lonHostID'};
                   5035:     Debug("My loncapa name is : $myloncapaname");
1.296     albertel 5036:     my %name_to_ip;
1.148     foxr     5037:     while (my $configline=<CONFIG>) {
1.277     albertel 5038: 	if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
                   5039: 	    my ($id,$domain,$role,$name)=split(/:/,$configline);
                   5040: 	    $name=~s/\s//g;
1.296     albertel 5041: 	    my $ip;
                   5042: 	    if (!exists($name_to_ip{$name})) {
                   5043: 		$ip = gethostbyname($name);
                   5044: 		if (!$ip || length($ip) ne 4) {
                   5045: 		    &logthis("Skipping host $id name $name no IP found\n");
                   5046: 		    next;
                   5047: 		}
                   5048: 		$ip=inet_ntoa($ip);
                   5049: 		$name_to_ip{$name} = $ip;
                   5050: 	    } else {
                   5051: 		$ip = $name_to_ip{$name};
1.277     albertel 5052: 	    }
1.200     matthew  5053: 	    $hostid{$ip}=$id;         # LonCAPA name of host by IP.
                   5054: 	    $hostdom{$id}=$domain;    # LonCAPA domain name of host. 
1.307     albertel 5055: 	    $hostname{$id}=$name;     # LonCAPA name -> DNS name
1.277     albertel 5056: 	    $hostip{$id}=$ip;         # IP address of host.
1.200     matthew  5057: 	    $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
                   5058: 
                   5059: 	    if ($id eq $perlvar{'lonHostID'}) { 
                   5060: 		Debug("Found me in the host table: $name");
                   5061: 		$thisserver=$name; 
                   5062: 	    }
1.178     foxr     5063: 	}
1.148     foxr     5064:     }
                   5065:     close(CONFIG);
                   5066: }
                   5067: #
                   5068: #  Reload the Apache daemon's state.
1.150     foxr     5069: #  This is done by invoking /home/httpd/perl/apachereload
                   5070: #  a setuid perl script that can be root for us to do this job.
1.148     foxr     5071: #
                   5072: sub ReloadApache {
1.150     foxr     5073:     my $execdir = $perlvar{'lonDaemons'};
                   5074:     my $script  = $execdir."/apachereload";
                   5075:     system($script);
1.148     foxr     5076: }
                   5077: 
                   5078: #
1.144     foxr     5079: #   Called in response to a USR2 signal.
                   5080: #   - Reread hosts.tab
                   5081: #   - All children connected to hosts that were removed from hosts.tab
                   5082: #     are killed via SIGINT
                   5083: #   - All children connected to previously existing hosts are sent SIGUSR1
                   5084: #   - Our internal hosts hash is updated to reflect the new contents of
                   5085: #     hosts.tab causing connections from hosts added to hosts.tab to
                   5086: #     now be honored.
                   5087: #
                   5088: sub UpdateHosts {
1.165     albertel 5089:     &status("Reload hosts.tab");
1.147     foxr     5090:     logthis('<font color="blue"> Updating connections </font>');
1.148     foxr     5091:     #
                   5092:     #  The %children hash has the set of IP's we currently have children
                   5093:     #  on.  These need to be matched against records in the hosts.tab
                   5094:     #  Any ip's no longer in the table get killed off they correspond to
                   5095:     #  either dropped or changed hosts.  Note that the re-read of the table
                   5096:     #  will take care of new and changed hosts as connections come into being.
                   5097: 
                   5098: 
                   5099:     KillHostHashes;
                   5100:     ReadHostTable;
                   5101: 
                   5102:     foreach my $child (keys %children) {
                   5103: 	my $childip = $children{$child};
                   5104: 	if(!$hostid{$childip}) {
1.149     foxr     5105: 	    logthis('<font color="blue"> UpdateHosts killing child '
                   5106: 		    ." $child for ip $childip </font>");
1.148     foxr     5107: 	    kill('INT', $child);
1.149     foxr     5108: 	} else {
                   5109: 	    logthis('<font color="green"> keeping child for ip '
                   5110: 		    ." $childip (pid=$child) </font>");
1.148     foxr     5111: 	}
                   5112:     }
                   5113:     ReloadApache;
1.165     albertel 5114:     &status("Finished reloading hosts.tab");
1.144     foxr     5115: }
                   5116: 
1.148     foxr     5117: 
1.57      www      5118: sub checkchildren {
1.165     albertel 5119:     &status("Checking on the children (sending signals)");
1.57      www      5120:     &initnewstatus();
                   5121:     &logstatus();
                   5122:     &logthis('Going to check on the children');
1.134     albertel 5123:     my $docdir=$perlvar{'lonDocRoot'};
1.61      harris41 5124:     foreach (sort keys %children) {
1.221     albertel 5125: 	#sleep 1;
1.57      www      5126:         unless (kill 'USR1' => $_) {
                   5127: 	    &logthis ('Child '.$_.' is dead');
                   5128:             &logstatus($$.' is dead');
1.221     albertel 5129: 	    delete($children{$_});
1.57      www      5130:         } 
1.61      harris41 5131:     }
1.63      www      5132:     sleep 5;
1.212     foxr     5133:     $SIG{ALRM} = sub { Debug("timeout"); 
                   5134: 		       die "timeout";  };
1.113     albertel 5135:     $SIG{__DIE__} = 'DEFAULT';
1.165     albertel 5136:     &status("Checking on the children (waiting for reports)");
1.63      www      5137:     foreach (sort keys %children) {
                   5138:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.113     albertel 5139:           eval {
                   5140:             alarm(300);
1.63      www      5141: 	    &logthis('Child '.$_.' did not respond');
1.67      albertel 5142: 	    kill 9 => $_;
1.131     albertel 5143: 	    #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   5144: 	    #$subj="LON: $currenthostid killed lond process $_";
                   5145: 	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
                   5146: 	    #$execdir=$perlvar{'lonDaemons'};
                   5147: 	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
1.221     albertel 5148: 	    delete($children{$_});
1.113     albertel 5149: 	    alarm(0);
                   5150: 	  }
1.63      www      5151:         }
                   5152:     }
1.113     albertel 5153:     $SIG{ALRM} = 'DEFAULT';
1.155     albertel 5154:     $SIG{__DIE__} = \&catchexception;
1.165     albertel 5155:     &status("Finished checking children");
1.221     albertel 5156:     &logthis('Finished Checking children');
1.57      www      5157: }
                   5158: 
1.1       albertel 5159: # --------------------------------------------------------------------- Logging
                   5160: 
                   5161: sub logthis {
                   5162:     my $message=shift;
                   5163:     my $execdir=$perlvar{'lonDaemons'};
                   5164:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
                   5165:     my $now=time;
                   5166:     my $local=localtime($now);
1.58      www      5167:     $lastlog=$local.': '.$message;
1.1       albertel 5168:     print $fh "$local ($$): $message\n";
                   5169: }
                   5170: 
1.77      foxr     5171: # ------------------------- Conditional log if $DEBUG true.
                   5172: sub Debug {
                   5173:     my $message = shift;
                   5174:     if($DEBUG) {
                   5175: 	&logthis($message);
                   5176:     }
                   5177: }
1.161     foxr     5178: 
                   5179: #
                   5180: #   Sub to do replies to client.. this gives a hook for some
                   5181: #   debug tracing too:
                   5182: #  Parameters:
                   5183: #     fd      - File open on client.
                   5184: #     reply   - Text to send to client.
                   5185: #     request - Original request from client.
                   5186: #
                   5187: sub Reply {
1.192     foxr     5188:     my ($fd, $reply, $request) = @_;
1.161     foxr     5189:     print $fd $reply;
                   5190:     Debug("Request was $request  Reply was $reply");
                   5191: 
1.212     foxr     5192:     $Transactions++;
                   5193: }
                   5194: 
                   5195: 
                   5196: #
                   5197: #    Sub to report a failure.
                   5198: #    This function:
                   5199: #     -   Increments the failure statistic counters.
                   5200: #     -   Invokes Reply to send the error message to the client.
                   5201: # Parameters:
                   5202: #    fd       - File descriptor open on the client
                   5203: #    reply    - Reply text to emit.
                   5204: #    request  - The original request message (used by Reply
                   5205: #               to debug if that's enabled.
                   5206: # Implicit outputs:
                   5207: #    $Failures- The number of failures is incremented.
                   5208: #    Reply (invoked here) sends a message to the 
                   5209: #    client:
                   5210: #
                   5211: sub Failure {
                   5212:     my $fd      = shift;
                   5213:     my $reply   = shift;
                   5214:     my $request = shift;
                   5215:    
                   5216:     $Failures++;
                   5217:     Reply($fd, $reply, $request);      # That's simple eh?
1.161     foxr     5218: }
1.57      www      5219: # ------------------------------------------------------------------ Log status
                   5220: 
                   5221: sub logstatus {
1.178     foxr     5222:     &status("Doing logging");
                   5223:     my $docdir=$perlvar{'lonDocRoot'};
                   5224:     {
                   5225: 	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
1.200     matthew  5226:         print $fh $status."\n".$lastlog."\n".time."\n$keymode";
1.178     foxr     5227:         $fh->close();
                   5228:     }
1.221     albertel 5229:     &status("Finished $$.txt");
                   5230:     {
                   5231: 	open(LOG,">>$docdir/lon-status/londstatus.txt");
                   5232: 	flock(LOG,LOCK_EX);
                   5233: 	print LOG $$."\t".$clientname."\t".$currenthostid."\t"
                   5234: 	    .$status."\t".$lastlog."\t $keymode\n";
1.275     albertel 5235: 	flock(LOG,LOCK_UN);
1.221     albertel 5236: 	close(LOG);
                   5237:     }
1.178     foxr     5238:     &status("Finished logging");
1.57      www      5239: }
                   5240: 
                   5241: sub initnewstatus {
                   5242:     my $docdir=$perlvar{'lonDocRoot'};
                   5243:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
                   5244:     my $now=time;
                   5245:     my $local=localtime($now);
                   5246:     print $fh "LOND status $local - parent $$\n\n";
1.64      www      5247:     opendir(DIR,"$docdir/lon-status/londchld");
1.134     albertel 5248:     while (my $filename=readdir(DIR)) {
1.64      www      5249:         unlink("$docdir/lon-status/londchld/$filename");
                   5250:     }
                   5251:     closedir(DIR);
1.57      www      5252: }
                   5253: 
                   5254: # -------------------------------------------------------------- Status setting
                   5255: 
                   5256: sub status {
                   5257:     my $what=shift;
                   5258:     my $now=time;
                   5259:     my $local=localtime($now);
1.178     foxr     5260:     $status=$local.': '.$what;
                   5261:     $0='lond: '.$what.' '.$local;
1.57      www      5262: }
1.11      www      5263: 
1.1       albertel 5264: # ----------------------------------------------------------- Send USR1 to lonc
                   5265: 
                   5266: sub reconlonc {
                   5267:     my $peerfile=shift;
                   5268:     &logthis("Trying to reconnect for $peerfile");
                   5269:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
                   5270:     if (my $fh=IO::File->new("$loncfile")) {
                   5271: 	my $loncpid=<$fh>;
                   5272:         chomp($loncpid);
                   5273:         if (kill 0 => $loncpid) {
                   5274: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
                   5275:             kill USR1 => $loncpid;
                   5276:         } else {
1.9       www      5277: 	    &logthis(
1.190     albertel 5278:               "<font color='red'>CRITICAL: "
1.9       www      5279:              ."lonc at pid $loncpid not responding, giving up</font>");
1.1       albertel 5280:         }
                   5281:     } else {
1.190     albertel 5282:       &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
1.1       albertel 5283:     }
                   5284: }
                   5285: 
                   5286: # -------------------------------------------------- Non-critical communication
1.11      www      5287: 
1.1       albertel 5288: sub subreply {
                   5289:     my ($cmd,$server)=@_;
1.307     albertel 5290:     my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};
1.1       albertel 5291:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   5292:                                       Type    => SOCK_STREAM,
                   5293:                                       Timeout => 10)
                   5294:        or return "con_lost";
1.307     albertel 5295:     print $sclient "sethost:$server:$cmd\n";
1.1       albertel 5296:     my $answer=<$sclient>;
                   5297:     chomp($answer);
                   5298:     if (!$answer) { $answer="con_lost"; }
                   5299:     return $answer;
                   5300: }
                   5301: 
                   5302: sub reply {
                   5303:   my ($cmd,$server)=@_;
                   5304:   my $answer;
1.115     albertel 5305:   if ($server ne $currenthostid) { 
1.1       albertel 5306:     $answer=subreply($cmd,$server);
                   5307:     if ($answer eq 'con_lost') {
                   5308: 	$answer=subreply("ping",$server);
                   5309:         if ($answer ne $server) {
1.115     albertel 5310: 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
1.307     albertel 5311:            &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$server});
1.1       albertel 5312:         }
                   5313:         $answer=subreply($cmd,$server);
                   5314:     }
                   5315:   } else {
                   5316:     $answer='self_reply';
                   5317:   } 
                   5318:   return $answer;
                   5319: }
                   5320: 
1.13      www      5321: # -------------------------------------------------------------- Talk to lonsql
                   5322: 
1.234     foxr     5323: sub sql_reply {
1.12      harris41 5324:     my ($cmd)=@_;
1.234     foxr     5325:     my $answer=&sub_sql_reply($cmd);
                   5326:     if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
1.12      harris41 5327:     return $answer;
                   5328: }
                   5329: 
1.234     foxr     5330: sub sub_sql_reply {
1.12      harris41 5331:     my ($cmd)=@_;
                   5332:     my $unixsock="mysqlsock";
                   5333:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
                   5334:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   5335:                                       Type    => SOCK_STREAM,
                   5336:                                       Timeout => 10)
                   5337:        or return "con_lost";
1.319     www      5338:     print $sclient "$cmd:$currentdomainid\n";
1.12      harris41 5339:     my $answer=<$sclient>;
                   5340:     chomp($answer);
                   5341:     if (!$answer) { $answer="con_lost"; }
                   5342:     return $answer;
                   5343: }
                   5344: 
1.1       albertel 5345: # --------------------------------------- Is this the home server of an author?
1.11      www      5346: 
1.1       albertel 5347: sub ishome {
                   5348:     my $author=shift;
                   5349:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                   5350:     my ($udom,$uname)=split(/\//,$author);
                   5351:     my $proname=propath($udom,$uname);
                   5352:     if (-e $proname) {
                   5353: 	return 'owner';
                   5354:     } else {
                   5355:         return 'not_owner';
                   5356:     }
                   5357: }
                   5358: 
                   5359: # ======================================================= Continue main program
                   5360: # ---------------------------------------------------- Fork once and dissociate
                   5361: 
1.134     albertel 5362: my $fpid=fork;
1.1       albertel 5363: exit if $fpid;
1.29      harris41 5364: die "Couldn't fork: $!" unless defined ($fpid);
1.1       albertel 5365: 
1.29      harris41 5366: POSIX::setsid() or die "Can't start new session: $!";
1.1       albertel 5367: 
                   5368: # ------------------------------------------------------- Write our PID on disk
                   5369: 
1.134     albertel 5370: my $execdir=$perlvar{'lonDaemons'};
1.1       albertel 5371: open (PIDSAVE,">$execdir/logs/lond.pid");
                   5372: print PIDSAVE "$$\n";
                   5373: close(PIDSAVE);
1.190     albertel 5374: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.57      www      5375: &status('Starting');
1.1       albertel 5376: 
1.106     foxr     5377: 
1.1       albertel 5378: 
                   5379: # ----------------------------------------------------- Install signal handlers
                   5380: 
1.57      www      5381: 
1.1       albertel 5382: $SIG{CHLD} = \&REAPER;
                   5383: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   5384: $SIG{HUP}  = \&HUPSMAN;
1.57      www      5385: $SIG{USR1} = \&checkchildren;
1.144     foxr     5386: $SIG{USR2} = \&UpdateHosts;
1.106     foxr     5387: 
1.148     foxr     5388: #  Read the host hashes:
                   5389: 
                   5390: ReadHostTable;
1.106     foxr     5391: 
1.286     albertel 5392: my $dist=`$perlvar{'lonDaemons'}/distprobe`;
                   5393: 
1.106     foxr     5394: # --------------------------------------------------------------
                   5395: #   Accept connections.  When a connection comes in, it is validated
                   5396: #   and if good, a child process is created to process transactions
                   5397: #   along the connection.
                   5398: 
1.1       albertel 5399: while (1) {
1.165     albertel 5400:     &status('Starting accept');
1.106     foxr     5401:     $client = $server->accept() or next;
1.165     albertel 5402:     &status('Accepted '.$client.' off to spawn');
1.106     foxr     5403:     make_new_child($client);
1.165     albertel 5404:     &status('Finished spawning');
1.1       albertel 5405: }
                   5406: 
1.212     foxr     5407: sub make_new_child {
                   5408:     my $pid;
                   5409: #    my $cipher;     # Now global
                   5410:     my $sigset;
1.178     foxr     5411: 
1.212     foxr     5412:     $client = shift;
                   5413:     &status('Starting new child '.$client);
                   5414:     &logthis('<font color="green"> Attempting to start child ('.$client.
                   5415: 	     ")</font>");    
                   5416:     # block signal for fork
                   5417:     $sigset = POSIX::SigSet->new(SIGINT);
                   5418:     sigprocmask(SIG_BLOCK, $sigset)
                   5419:         or die "Can't block SIGINT for fork: $!\n";
1.178     foxr     5420: 
1.212     foxr     5421:     die "fork: $!" unless defined ($pid = fork);
1.178     foxr     5422: 
1.212     foxr     5423:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                   5424: 	                               # connection liveness.
1.178     foxr     5425: 
1.212     foxr     5426:     #
                   5427:     #  Figure out who we're talking to so we can record the peer in 
                   5428:     #  the pid hash.
                   5429:     #
                   5430:     my $caller = getpeername($client);
                   5431:     my ($port,$iaddr);
                   5432:     if (defined($caller) && length($caller) > 0) {
                   5433: 	($port,$iaddr)=unpack_sockaddr_in($caller);
                   5434:     } else {
                   5435: 	&logthis("Unable to determine who caller was, getpeername returned nothing");
                   5436:     }
                   5437:     if (defined($iaddr)) {
                   5438: 	$clientip  = inet_ntoa($iaddr);
                   5439: 	Debug("Connected with $clientip");
                   5440:     } else {
                   5441: 	&logthis("Unable to determine clientip");
                   5442: 	$clientip='Unavailable';
                   5443:     }
                   5444:     
                   5445:     if ($pid) {
                   5446:         # Parent records the child's birth and returns.
                   5447:         sigprocmask(SIG_UNBLOCK, $sigset)
                   5448:             or die "Can't unblock SIGINT for fork: $!\n";
                   5449:         $children{$pid} = $clientip;
                   5450:         &status('Started child '.$pid);
                   5451:         return;
                   5452:     } else {
                   5453:         # Child can *not* return from this subroutine.
                   5454:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
                   5455:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
                   5456:                                 #don't get intercepted
                   5457:         $SIG{USR1}= \&logstatus;
                   5458:         $SIG{ALRM}= \&timeout;
                   5459:         $lastlog='Forked ';
                   5460:         $status='Forked';
1.178     foxr     5461: 
1.212     foxr     5462:         # unblock signals
                   5463:         sigprocmask(SIG_UNBLOCK, $sigset)
                   5464:             or die "Can't unblock SIGINT for fork: $!\n";
1.178     foxr     5465: 
1.212     foxr     5466: #        my $tmpsnum=0;            # Now global
                   5467: #---------------------------------------------------- kerberos 5 initialization
                   5468:         &Authen::Krb5::init_context();
1.359     raeburn  5469: 	unless (($dist eq 'fedora5') || ($dist eq 'fedora4') ||  
                   5470: 		($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
1.286     albertel 5471: 	    &Authen::Krb5::init_ets();
                   5472: 	}
1.209     albertel 5473: 
1.212     foxr     5474: 	&status('Accepted connection');
                   5475: # =============================================================================
                   5476:             # do something with the connection
                   5477: # -----------------------------------------------------------------------------
                   5478: 	# see if we know client and 'check' for spoof IP by ineffective challenge
1.178     foxr     5479: 
1.212     foxr     5480: 	ReadManagerTable;	# May also be a manager!!
                   5481: 	
1.278     albertel 5482: 	my $outsideip=$clientip;
                   5483: 	if ($clientip eq '127.0.0.1') {
                   5484: 	    $outsideip=$hostip{$perlvar{'lonHostID'}};
                   5485: 	}
                   5486: 
                   5487: 	my $clientrec=($hostid{$outsideip}     ne undef);
                   5488: 	my $ismanager=($managers{$outsideip}    ne undef);
1.212     foxr     5489: 	$clientname  = "[unknonwn]";
                   5490: 	if($clientrec) {	# Establish client type.
                   5491: 	    $ConnectionType = "client";
1.278     albertel 5492: 	    $clientname = $hostid{$outsideip};
1.212     foxr     5493: 	    if($ismanager) {
                   5494: 		$ConnectionType = "both";
                   5495: 	    }
                   5496: 	} else {
                   5497: 	    $ConnectionType = "manager";
1.278     albertel 5498: 	    $clientname = $managers{$outsideip};
1.212     foxr     5499: 	}
                   5500: 	my $clientok;
1.178     foxr     5501: 
1.212     foxr     5502: 	if ($clientrec || $ismanager) {
                   5503: 	    &status("Waiting for init from $clientip $clientname");
                   5504: 	    &logthis('<font color="yellow">INFO: Connection, '.
                   5505: 		     $clientip.
                   5506: 		  " ($clientname) connection type = $ConnectionType </font>" );
                   5507: 	    &status("Connecting $clientip  ($clientname))"); 
                   5508: 	    my $remotereq=<$client>;
                   5509: 	    chomp($remotereq);
                   5510: 	    Debug("Got init: $remotereq");
1.337     albertel 5511: 
1.212     foxr     5512: 	    if ($remotereq =~ /^init/) {
                   5513: 		&sethost("sethost:$perlvar{'lonHostID'}");
                   5514: 		#
                   5515: 		#  If the remote is attempting a local init... give that a try:
                   5516: 		#
                   5517: 		my ($i, $inittype) = split(/:/, $remotereq);
1.209     albertel 5518: 
1.212     foxr     5519: 		# If the connection type is ssl, but I didn't get my
                   5520: 		# certificate files yet, then I'll drop  back to 
                   5521: 		# insecure (if allowed).
                   5522: 		
                   5523: 		if($inittype eq "ssl") {
                   5524: 		    my ($ca, $cert) = lonssl::CertificateFile;
                   5525: 		    my $kfile       = lonssl::KeyFile;
                   5526: 		    if((!$ca)   || 
                   5527: 		       (!$cert) || 
                   5528: 		       (!$kfile)) {
                   5529: 			$inittype = ""; # This forces insecure attempt.
                   5530: 			&logthis("<font color=\"blue\"> Certificates not "
                   5531: 				 ."installed -- trying insecure auth</font>");
1.224     foxr     5532: 		    } else {	# SSL certificates are in place so
1.212     foxr     5533: 		    }		# Leave the inittype alone.
                   5534: 		}
                   5535: 
                   5536: 		if($inittype eq "local") {
                   5537: 		    my $key = LocalConnection($client, $remotereq);
                   5538: 		    if($key) {
                   5539: 			Debug("Got local key $key");
                   5540: 			$clientok     = 1;
                   5541: 			my $cipherkey = pack("H32", $key);
                   5542: 			$cipher       = new IDEA($cipherkey);
                   5543: 			print $client "ok:local\n";
                   5544: 			&logthis('<font color="green"'
                   5545: 				 . "Successful local authentication </font>");
                   5546: 			$keymode = "local"
1.178     foxr     5547: 		    } else {
1.212     foxr     5548: 			Debug("Failed to get local key");
                   5549: 			$clientok = 0;
                   5550: 			shutdown($client, 3);
                   5551: 			close $client;
1.178     foxr     5552: 		    }
1.212     foxr     5553: 		} elsif ($inittype eq "ssl") {
                   5554: 		    my $key = SSLConnection($client);
                   5555: 		    if ($key) {
                   5556: 			$clientok = 1;
                   5557: 			my $cipherkey = pack("H32", $key);
                   5558: 			$cipher       = new IDEA($cipherkey);
                   5559: 			&logthis('<font color="green">'
                   5560: 				 ."Successfull ssl authentication with $clientname </font>");
                   5561: 			$keymode = "ssl";
                   5562: 	     
1.178     foxr     5563: 		    } else {
1.212     foxr     5564: 			$clientok = 0;
                   5565: 			close $client;
1.178     foxr     5566: 		    }
1.212     foxr     5567: 	   
                   5568: 		} else {
                   5569: 		    my $ok = InsecureConnection($client);
                   5570: 		    if($ok) {
                   5571: 			$clientok = 1;
                   5572: 			&logthis('<font color="green">'
                   5573: 				 ."Successful insecure authentication with $clientname </font>");
                   5574: 			print $client "ok\n";
                   5575: 			$keymode = "insecure";
1.178     foxr     5576: 		    } else {
1.212     foxr     5577: 			&logthis('<font color="yellow">'
                   5578: 				  ."Attempted insecure connection disallowed </font>");
                   5579: 			close $client;
                   5580: 			$clientok = 0;
1.178     foxr     5581: 			
                   5582: 		    }
                   5583: 		}
1.212     foxr     5584: 	    } else {
                   5585: 		&logthis(
                   5586: 			 "<font color='blue'>WARNING: "
                   5587: 			 ."$clientip failed to initialize: >$remotereq< </font>");
                   5588: 		&status('No init '.$clientip);
                   5589: 	    }
                   5590: 	    
                   5591: 	} else {
                   5592: 	    &logthis(
                   5593: 		     "<font color='blue'>WARNING: Unknown client $clientip</font>");
                   5594: 	    &status('Hung up on '.$clientip);
                   5595: 	}
                   5596:  
                   5597: 	if ($clientok) {
                   5598: # ---------------- New known client connecting, could mean machine online again
                   5599: 	    
                   5600: 	    foreach my $id (keys(%hostip)) {
                   5601: 		if ($hostip{$id} ne $clientip ||
                   5602: 		    $hostip{$currenthostid} eq $clientip) {
                   5603: 		    # no need to try to do recon's to myself
                   5604: 		    next;
                   5605: 		}
1.307     albertel 5606: 		&reconlonc("$perlvar{'lonSockDir'}/".$hostname{$id});
1.212     foxr     5607: 	    }
                   5608: 	    &logthis("<font color='green'>Established connection: $clientname</font>");
                   5609: 	    &status('Will listen to '.$clientname);
                   5610: # ------------------------------------------------------------ Process requests
                   5611: 	    my $keep_going = 1;
                   5612: 	    my $user_input;
                   5613: 	    while(($user_input = get_request) && $keep_going) {
                   5614: 		alarm(120);
                   5615: 		Debug("Main: Got $user_input\n");
                   5616: 		$keep_going = &process_request($user_input);
1.178     foxr     5617: 		alarm(0);
1.212     foxr     5618: 		&status('Listening to '.$clientname." ($keymode)");	   
1.161     foxr     5619: 	    }
1.212     foxr     5620: 
1.59      www      5621: # --------------------------------------------- client unknown or fishy, refuse
1.212     foxr     5622: 	}  else {
1.161     foxr     5623: 	    print $client "refused\n";
                   5624: 	    $client->close();
1.190     albertel 5625: 	    &logthis("<font color='blue'>WARNING: "
1.161     foxr     5626: 		     ."Rejected client $clientip, closing connection</font>");
                   5627: 	}
1.212     foxr     5628:     }            
1.161     foxr     5629:     
1.1       albertel 5630: # =============================================================================
1.161     foxr     5631:     
1.190     albertel 5632:     &logthis("<font color='red'>CRITICAL: "
1.161     foxr     5633: 	     ."Disconnect from $clientip ($clientname)</font>");    
                   5634:     
                   5635:     
                   5636:     # this exit is VERY important, otherwise the child will become
                   5637:     # a producer of more and more children, forking yourself into
                   5638:     # process death.
                   5639:     exit;
1.106     foxr     5640:     
1.78      foxr     5641: }
1.261     foxr     5642: #
                   5643: #   Determine if a user is an author for the indicated domain.
                   5644: #
                   5645: # Parameters:
                   5646: #    domain          - domain to check in .
                   5647: #    user            - Name of user to check.
                   5648: #
                   5649: # Return:
                   5650: #     1             - User is an author for domain.
                   5651: #     0             - User is not an author for domain.
                   5652: sub is_author {
                   5653:     my ($domain, $user) = @_;
                   5654: 
                   5655:     &Debug("is_author: $user @ $domain");
                   5656: 
                   5657:     my $hashref = &tie_user_hash($domain, $user, "roles",
                   5658: 				 &GDBM_READER());
                   5659: 
                   5660:     #  Author role should show up as a key /domain/_au
1.78      foxr     5661: 
1.321     albertel 5662:     my $key    = "/$domain/_au";
                   5663:     my $value;
                   5664:     if (defined($hashref)) {
                   5665: 	$value = $hashref->{$key};
                   5666:     }
1.78      foxr     5667: 
1.261     foxr     5668:     if(defined($value)) {
                   5669: 	&Debug("$user @ $domain is an author");
                   5670:     }
                   5671: 
                   5672:     return defined($value);
                   5673: }
1.78      foxr     5674: #
                   5675: #   Checks to see if the input roleput request was to set
                   5676: # an author role.  If so, invokes the lchtmldir script to set
                   5677: # up a correct public_html 
                   5678: # Parameters:
                   5679: #    request   - The request sent to the rolesput subchunk.
                   5680: #                We're looking for  /domain/_au
                   5681: #    domain    - The domain in which the user is having roles doctored.
                   5682: #    user      - Name of the user for which the role is being put.
                   5683: #    authtype  - The authentication type associated with the user.
                   5684: #
1.289     albertel 5685: sub manage_permissions {
1.192     foxr     5686:     my ($request, $domain, $user, $authtype) = @_;
1.78      foxr     5687: 
1.261     foxr     5688:     &Debug("manage_permissions: $request $domain $user $authtype");
                   5689: 
1.78      foxr     5690:     # See if the request is of the form /$domain/_au
1.289     albertel 5691:     if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
1.78      foxr     5692: 	my $execdir = $perlvar{'lonDaemons'};
                   5693: 	my $userhome= "/home/$user" ;
1.134     albertel 5694: 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.261     foxr     5695: 	&Debug("Setting homedir permissions for $userhome");
1.78      foxr     5696: 	system("$execdir/lchtmldir $userhome $user $authtype");
                   5697:     }
                   5698: }
1.222     foxr     5699: 
                   5700: 
                   5701: #
                   5702: #  Return the full path of a user password file, whether it exists or not.
                   5703: # Parameters:
                   5704: #   domain     - Domain in which the password file lives.
                   5705: #   user       - name of the user.
                   5706: # Returns:
                   5707: #    Full passwd path:
                   5708: #
                   5709: sub password_path {
                   5710:     my ($domain, $user) = @_;
1.264     albertel 5711:     return &propath($domain, $user).'/passwd';
1.222     foxr     5712: }
                   5713: 
                   5714: #   Password Filename
                   5715: #   Returns the path to a passwd file given domain and user... only if
                   5716: #  it exists.
                   5717: # Parameters:
                   5718: #   domain    - Domain in which to search.
                   5719: #   user      - username.
                   5720: # Returns:
                   5721: #   - If the password file exists returns its path.
                   5722: #   - If the password file does not exist, returns undefined.
                   5723: #
                   5724: sub password_filename {
                   5725:     my ($domain, $user) = @_;
                   5726: 
                   5727:     Debug ("PasswordFilename called: dom = $domain user = $user");
                   5728: 
                   5729:     my $path  = &password_path($domain, $user);
                   5730:     Debug("PasswordFilename got path: $path");
                   5731:     if(-e $path) {
                   5732: 	return $path;
                   5733:     } else {
                   5734: 	return undef;
                   5735:     }
                   5736: }
                   5737: 
                   5738: #
                   5739: #   Rewrite the contents of the user's passwd file.
                   5740: #  Parameters:
                   5741: #    domain    - domain of the user.
                   5742: #    name      - User's name.
                   5743: #    contents  - New contents of the file.
                   5744: # Returns:
                   5745: #   0    - Failed.
                   5746: #   1    - Success.
                   5747: #
                   5748: sub rewrite_password_file {
                   5749:     my ($domain, $user, $contents) = @_;
                   5750: 
                   5751:     my $file = &password_filename($domain, $user);
                   5752:     if (defined $file) {
                   5753: 	my $pf = IO::File->new(">$file");
                   5754: 	if($pf) {
                   5755: 	    print $pf "$contents\n";
                   5756: 	    return 1;
                   5757: 	} else {
                   5758: 	    return 0;
                   5759: 	}
                   5760:     } else {
                   5761: 	return 0;
                   5762:     }
                   5763: 
                   5764: }
                   5765: 
1.78      foxr     5766: #
1.222     foxr     5767: #   get_auth_type - Determines the authorization type of a user in a domain.
1.78      foxr     5768: 
                   5769: #     Returns the authorization type or nouser if there is no such user.
                   5770: #
1.222     foxr     5771: sub get_auth_type 
1.78      foxr     5772: {
1.192     foxr     5773: 
                   5774:     my ($domain, $user)  = @_;
1.78      foxr     5775: 
1.222     foxr     5776:     Debug("get_auth_type( $domain, $user ) \n");
1.78      foxr     5777:     my $proname    = &propath($domain, $user); 
                   5778:     my $passwdfile = "$proname/passwd";
                   5779:     if( -e $passwdfile ) {
                   5780: 	my $pf = IO::File->new($passwdfile);
                   5781: 	my $realpassword = <$pf>;
                   5782: 	chomp($realpassword);
1.79      foxr     5783: 	Debug("Password info = $realpassword\n");
1.78      foxr     5784: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79      foxr     5785: 	Debug("Authtype = $authtype, content = $contentpwd\n");
1.259     raeburn  5786: 	return "$authtype:$contentpwd";     
1.224     foxr     5787:     } else {
1.79      foxr     5788: 	Debug("Returning nouser");
1.78      foxr     5789: 	return "nouser";
                   5790:     }
1.1       albertel 5791: }
                   5792: 
1.220     foxr     5793: #
                   5794: #  Validate a user given their domain, name and password.  This utility
                   5795: #  function is used by both  AuthenticateHandler and ChangePasswordHandler
                   5796: #  to validate the login credentials of a user.
                   5797: # Parameters:
                   5798: #    $domain    - The domain being logged into (this is required due to
                   5799: #                 the capability for multihomed systems.
                   5800: #    $user      - The name of the user being validated.
                   5801: #    $password  - The user's propoposed password.
                   5802: #
                   5803: # Returns:
                   5804: #     1        - The domain,user,pasword triplet corresponds to a valid
                   5805: #                user.
                   5806: #     0        - The domain,user,password triplet is not a valid user.
                   5807: #
                   5808: sub validate_user {
                   5809:     my ($domain, $user, $password) = @_;
                   5810: 
                   5811: 
                   5812:     # Why negative ~pi you may well ask?  Well this function is about
                   5813:     # authentication, and therefore very important to get right.
                   5814:     # I've initialized the flag that determines whether or not I've 
                   5815:     # validated correctly to a value it's not supposed to get.
                   5816:     # At the end of this function. I'll ensure that it's not still that
                   5817:     # value so we don't just wind up returning some accidental value
                   5818:     # as a result of executing an unforseen code path that
1.249     foxr     5819:     # did not set $validated.  At the end of valid execution paths,
                   5820:     # validated shoule be 1 for success or 0 for failuer.
1.220     foxr     5821: 
                   5822:     my $validated = -3.14159;
                   5823: 
                   5824:     #  How we authenticate is determined by the type of authentication
                   5825:     #  the user has been assigned.  If the authentication type is
                   5826:     #  "nouser", the user does not exist so we will return 0.
                   5827: 
1.222     foxr     5828:     my $contents = &get_auth_type($domain, $user);
1.220     foxr     5829:     my ($howpwd, $contentpwd) = split(/:/, $contents);
                   5830: 
                   5831:     my $null = pack("C",0);	# Used by kerberos auth types.
                   5832: 
                   5833:     if ($howpwd ne 'nouser') {
                   5834: 
                   5835: 	if($howpwd eq "internal") { # Encrypted is in local password file.
                   5836: 	    $validated = (crypt($password, $contentpwd) eq $contentpwd);
                   5837: 	}
                   5838: 	elsif ($howpwd eq "unix") { # User is a normal unix user.
                   5839: 	    $contentpwd = (getpwnam($user))[1];
                   5840: 	    if($contentpwd) {
                   5841: 		if($contentpwd eq 'x') { # Shadow password file...
                   5842: 		    my $pwauth_path = "/usr/local/sbin/pwauth";
                   5843: 		    open PWAUTH,  "|$pwauth_path" or
                   5844: 			die "Cannot invoke authentication";
                   5845: 		    print PWAUTH "$user\n$password\n";
                   5846: 		    close PWAUTH;
                   5847: 		    $validated = ! $?;
                   5848: 
                   5849: 		} else { 	         # Passwords in /etc/passwd. 
                   5850: 		    $validated = (crypt($password,
                   5851: 					$contentpwd) eq $contentpwd);
                   5852: 		}
                   5853: 	    } else {
                   5854: 		$validated = 0;
                   5855: 	    }
                   5856: 	}
                   5857: 	elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
                   5858: 	    if(! ($password =~ /$null/) ) {
                   5859: 		my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
                   5860: 							   "",
                   5861: 							   $contentpwd,,
                   5862: 							   'krbtgt',
                   5863: 							   $contentpwd,
                   5864: 							   1,
                   5865: 							   $password);
                   5866: 		if(!$k4error) {
                   5867: 		    $validated = 1;
1.224     foxr     5868: 		} else {
1.220     foxr     5869: 		    $validated = 0;
                   5870: 		    &logthis('krb4: '.$user.', '.$contentpwd.', '.
                   5871: 			     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
                   5872: 		}
1.224     foxr     5873: 	    } else {
1.220     foxr     5874: 		$validated = 0; # Password has a match with null.
                   5875: 	    }
1.224     foxr     5876: 	} elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
1.220     foxr     5877: 	    if(!($password =~ /$null/)) { # Null password not allowed.
                   5878: 		my $krbclient = &Authen::Krb5::parse_name($user.'@'
                   5879: 							  .$contentpwd);
                   5880: 		my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
                   5881: 		my $krbserver  = &Authen::Krb5::parse_name($krbservice);
                   5882: 		my $credentials= &Authen::Krb5::cc_default();
1.359     raeburn  5883: 		$credentials->initialize(&Authen::Krb5::parse_name($user.'@'
                   5884:                                                                  .$contentpwd));
1.270     matthew  5885: 		my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,
1.220     foxr     5886: 									 $krbserver,
                   5887: 									 $password,
                   5888: 									 $credentials);
                   5889: 		$validated = ($krbreturn == 1);
1.224     foxr     5890: 	    } else {
1.220     foxr     5891: 		$validated = 0;
                   5892: 	    }
1.224     foxr     5893: 	} elsif ($howpwd eq "localauth") { 
1.220     foxr     5894: 	    #  Authenticate via installation specific authentcation method:
                   5895: 	    $validated = &localauth::localauth($user, 
                   5896: 					       $password, 
1.353     albertel 5897: 					       $contentpwd,
                   5898: 					       $domain);
1.358     albertel 5899: 	    if ($validated < 0) {
1.357     albertel 5900: 		&logthis("localauth for $contentpwd $user:$domain returned a $validated");
                   5901: 		$validated = 0;
                   5902: 	    }
1.224     foxr     5903: 	} else {			# Unrecognized auth is also bad.
1.220     foxr     5904: 	    $validated = 0;
                   5905: 	}
                   5906:     } else {
                   5907: 	$validated = 0;
                   5908:     }
                   5909:     #
                   5910:     #  $validated has the correct stat of the authentication:
                   5911:     #
                   5912: 
                   5913:     unless ($validated != -3.14159) {
1.249     foxr     5914: 	#  I >really really< want to know if this happens.
                   5915: 	#  since it indicates that user authentication is badly
                   5916: 	#  broken in some code path.
                   5917:         #
                   5918: 	die "ValidateUser - failed to set the value of validated $domain, $user $password";
1.220     foxr     5919:     }
                   5920:     return $validated;
                   5921: }
                   5922: 
                   5923: 
1.84      albertel 5924: sub addline {
                   5925:     my ($fname,$hostid,$ip,$newline)=@_;
                   5926:     my $contents;
                   5927:     my $found=0;
1.355     albertel 5928:     my $expr='^'.quotemeta($hostid).':'.quotemeta($ip).':';
1.134     albertel 5929:     my $sh;
1.84      albertel 5930:     if ($sh=IO::File->new("$fname.subscription")) {
                   5931: 	while (my $subline=<$sh>) {
                   5932: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
                   5933: 	}
                   5934: 	$sh->close();
                   5935:     }
                   5936:     $sh=IO::File->new(">$fname.subscription");
                   5937:     if ($contents) { print $sh $contents; }
                   5938:     if ($newline) { print $sh $newline; }
                   5939:     $sh->close();
                   5940:     return $found;
1.86      www      5941: }
                   5942: 
1.234     foxr     5943: sub get_chat {
1.324     raeburn  5944:     my ($cdom,$cname,$udom,$uname,$group)=@_;
1.310     albertel 5945: 
1.87      www      5946:     my @entries=();
1.324     raeburn  5947:     my $namespace = 'nohist_chatroom';
                   5948:     my $namespace_inroom = 'nohist_inchatroom';
1.335     albertel 5949:     if ($group ne '') {
1.324     raeburn  5950:         $namespace .= '_'.$group;
                   5951:         $namespace_inroom .= '_'.$group;
                   5952:     }
                   5953:     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
1.310     albertel 5954: 				 &GDBM_READER());
                   5955:     if ($hashref) {
                   5956: 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
1.311     albertel 5957: 	&untie_user_hash($hashref);
1.123     www      5958:     }
1.124     www      5959:     my @participants=();
1.134     albertel 5960:     my $cutoff=time-60;
1.324     raeburn  5961:     $hashref = &tie_user_hash($cdom, $cname, $namespace_inroom,
1.310     albertel 5962: 			      &GDBM_WRCREAT());
                   5963:     if ($hashref) {
                   5964:         $hashref->{$uname.':'.$udom}=time;
                   5965:         foreach my $user (sort(keys(%$hashref))) {
                   5966: 	    if ($hashref->{$user}>$cutoff) {
                   5967: 		push(@participants, 'active_participant:'.$user);
1.123     www      5968:             }
                   5969:         }
1.311     albertel 5970:         &untie_user_hash($hashref);
1.86      www      5971:     }
1.124     www      5972:     return (@participants,@entries);
1.86      www      5973: }
                   5974: 
1.234     foxr     5975: sub chat_add {
1.324     raeburn  5976:     my ($cdom,$cname,$newchat,$group)=@_;
1.88      albertel 5977:     my @entries=();
1.142     www      5978:     my $time=time;
1.324     raeburn  5979:     my $namespace = 'nohist_chatroom';
                   5980:     my $logfile = 'chatroom.log';
1.335     albertel 5981:     if ($group ne '') {
1.324     raeburn  5982:         $namespace .= '_'.$group;
                   5983:         $logfile = 'chatroom_'.$group.'.log';
                   5984:     }
                   5985:     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
1.310     albertel 5986: 				 &GDBM_WRCREAT());
                   5987:     if ($hashref) {
                   5988: 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
1.88      albertel 5989: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
                   5990: 	my ($thentime,$idnum)=split(/\_/,$lastid);
                   5991: 	my $newid=$time.'_000000';
                   5992: 	if ($thentime==$time) {
                   5993: 	    $idnum=~s/^0+//;
                   5994: 	    $idnum++;
                   5995: 	    $idnum=substr('000000'.$idnum,-6,6);
                   5996: 	    $newid=$time.'_'.$idnum;
                   5997: 	}
1.310     albertel 5998: 	$hashref->{$newid}=$newchat;
1.88      albertel 5999: 	my $expired=$time-3600;
1.310     albertel 6000: 	foreach my $comment (keys(%$hashref)) {
                   6001: 	    my ($thistime) = ($comment=~/(\d+)\_/);
1.88      albertel 6002: 	    if ($thistime<$expired) {
1.310     albertel 6003: 		delete $hashref->{$comment};
1.88      albertel 6004: 	    }
                   6005: 	}
1.310     albertel 6006: 	{
                   6007: 	    my $proname=&propath($cdom,$cname);
1.324     raeburn  6008: 	    if (open(CHATLOG,">>$proname/$logfile")) { 
1.310     albertel 6009: 		print CHATLOG ("$time:".&unescape($newchat)."\n");
                   6010: 	    }
                   6011: 	    close(CHATLOG);
1.142     www      6012: 	}
1.311     albertel 6013: 	&untie_user_hash($hashref);
1.86      www      6014:     }
1.84      albertel 6015: }
                   6016: 
                   6017: sub unsub {
                   6018:     my ($fname,$clientip)=@_;
                   6019:     my $result;
1.188     foxr     6020:     my $unsubs = 0;		# Number of successful unsubscribes:
                   6021: 
                   6022: 
                   6023:     # An old way subscriptions were handled was to have a 
                   6024:     # subscription marker file:
                   6025: 
                   6026:     Debug("Attempting unlink of $fname.$clientname");
1.161     foxr     6027:     if (unlink("$fname.$clientname")) {
1.188     foxr     6028: 	$unsubs++;		# Successful unsub via marker file.
                   6029:     } 
                   6030: 
                   6031:     # The more modern way to do it is to have a subscription list
                   6032:     # file:
                   6033: 
1.84      albertel 6034:     if (-e "$fname.subscription") {
1.161     foxr     6035: 	my $found=&addline($fname,$clientname,$clientip,'');
1.188     foxr     6036: 	if ($found) { 
                   6037: 	    $unsubs++;
                   6038: 	}
                   6039:     } 
                   6040: 
                   6041:     #  If either or both of these mechanisms succeeded in unsubscribing a 
                   6042:     #  resource we can return ok:
                   6043: 
                   6044:     if($unsubs) {
                   6045: 	$result = "ok\n";
1.84      albertel 6046:     } else {
1.188     foxr     6047: 	$result = "not_subscribed\n";
1.84      albertel 6048:     }
1.188     foxr     6049: 
1.84      albertel 6050:     return $result;
                   6051: }
                   6052: 
1.101     www      6053: sub currentversion {
                   6054:     my $fname=shift;
                   6055:     my $version=-1;
                   6056:     my $ulsdir='';
                   6057:     if ($fname=~/^(.+)\/[^\/]+$/) {
                   6058:        $ulsdir=$1;
                   6059:     }
1.114     albertel 6060:     my ($fnamere1,$fnamere2);
                   6061:     # remove version if already specified
1.101     www      6062:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114     albertel 6063:     # get the bits that go before and after the version number
                   6064:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
                   6065: 	$fnamere1=$1;
                   6066: 	$fnamere2='.'.$2;
                   6067:     }
1.101     www      6068:     if (-e $fname) { $version=1; }
                   6069:     if (-e $ulsdir) {
1.134     albertel 6070: 	if(-d $ulsdir) {
                   6071: 	    if (opendir(LSDIR,$ulsdir)) {
                   6072: 		my $ulsfn;
                   6073: 		while ($ulsfn=readdir(LSDIR)) {
1.101     www      6074: # see if this is a regular file (ignore links produced earlier)
1.134     albertel 6075: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
                   6076: 		    unless (-l $thisfile) {
1.160     www      6077: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134     albertel 6078: 			    if ($1>$version) { $version=$1; }
                   6079: 			}
                   6080: 		    }
                   6081: 		}
                   6082: 		closedir(LSDIR);
                   6083: 		$version++;
                   6084: 	    }
                   6085: 	}
                   6086:     }
                   6087:     return $version;
1.101     www      6088: }
                   6089: 
                   6090: sub thisversion {
                   6091:     my $fname=shift;
                   6092:     my $version=-1;
                   6093:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
                   6094: 	$version=$1;
                   6095:     }
                   6096:     return $version;
                   6097: }
                   6098: 
1.84      albertel 6099: sub subscribe {
                   6100:     my ($userinput,$clientip)=@_;
                   6101:     my $result;
1.293     albertel 6102:     my ($cmd,$fname)=split(/:/,$userinput,2);
1.84      albertel 6103:     my $ownership=&ishome($fname);
                   6104:     if ($ownership eq 'owner') {
1.101     www      6105: # explitly asking for the current version?
                   6106:         unless (-e $fname) {
                   6107:             my $currentversion=&currentversion($fname);
                   6108: 	    if (&thisversion($fname)==$currentversion) {
                   6109:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
                   6110: 		    my $root=$1;
                   6111:                     my $extension=$2;
                   6112:                     symlink($root.'.'.$extension,
                   6113:                             $root.'.'.$currentversion.'.'.$extension);
1.102     www      6114:                     unless ($extension=~/\.meta$/) {
                   6115:                        symlink($root.'.'.$extension.'.meta',
                   6116:                             $root.'.'.$currentversion.'.'.$extension.'.meta');
                   6117: 		    }
1.101     www      6118:                 }
                   6119:             }
                   6120:         }
1.84      albertel 6121: 	if (-e $fname) {
                   6122: 	    if (-d $fname) {
                   6123: 		$result="directory\n";
                   6124: 	    } else {
1.161     foxr     6125: 		if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134     albertel 6126: 		my $now=time;
1.161     foxr     6127: 		my $found=&addline($fname,$clientname,$clientip,
                   6128: 				   "$clientname:$clientip:$now\n");
1.84      albertel 6129: 		if ($found) { $result="$fname\n"; }
                   6130: 		# if they were subscribed to only meta data, delete that
                   6131:                 # subscription, when you subscribe to a file you also get
                   6132:                 # the metadata
                   6133: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
                   6134: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
                   6135: 		$fname="http://$thisserver/".$fname;
                   6136: 		$result="$fname\n";
                   6137: 	    }
                   6138: 	} else {
                   6139: 	    $result="not_found\n";
                   6140: 	}
                   6141:     } else {
                   6142: 	$result="rejected\n";
                   6143:     }
                   6144:     return $result;
                   6145: }
1.287     foxr     6146: #  Change the passwd of a unix user.  The caller must have
                   6147: #  first verified that the user is a loncapa user.
                   6148: #
                   6149: # Parameters:
                   6150: #    user      - Unix user name to change.
                   6151: #    pass      - New password for the user.
                   6152: # Returns:
                   6153: #    ok    - if success
                   6154: #    other - Some meaningfule error message string.
                   6155: # NOTE:
                   6156: #    invokes a setuid script to change the passwd.
                   6157: sub change_unix_password {
                   6158:     my ($user, $pass) = @_;
                   6159: 
                   6160:     &Debug("change_unix_password");
                   6161:     my $execdir=$perlvar{'lonDaemons'};
                   6162:     &Debug("Opening lcpasswd pipeline");
                   6163:     my $pf = IO::File->new("|$execdir/lcpasswd > "
                   6164: 			   ."$perlvar{'lonDaemons'}"
                   6165: 			   ."/logs/lcpasswd.log");
                   6166:     print $pf "$user\n$pass\n$pass\n";
                   6167:     close $pf;
                   6168:     my $err = $?;
                   6169:     return ($err < @passwderrors) ? $passwderrors[$err] : 
                   6170: 	"pwchange_falure - unknown error";
                   6171: 
                   6172:     
                   6173: }
                   6174: 
1.91      albertel 6175: 
                   6176: sub make_passwd_file {
1.98      foxr     6177:     my ($uname, $umode,$npass,$passfilename)=@_;
1.91      albertel 6178:     my $result="ok\n";
                   6179:     if ($umode eq 'krb4' or $umode eq 'krb5') {
                   6180: 	{
                   6181: 	    my $pf = IO::File->new(">$passfilename");
1.261     foxr     6182: 	    if ($pf) {
                   6183: 		print $pf "$umode:$npass\n";
                   6184: 	    } else {
                   6185: 		$result = "pass_file_failed_error";
                   6186: 	    }
1.91      albertel 6187: 	}
                   6188:     } elsif ($umode eq 'internal') {
                   6189: 	my $salt=time;
                   6190: 	$salt=substr($salt,6,2);
                   6191: 	my $ncpass=crypt($npass,$salt);
                   6192: 	{
                   6193: 	    &Debug("Creating internal auth");
                   6194: 	    my $pf = IO::File->new(">$passfilename");
1.261     foxr     6195: 	    if($pf) {
                   6196: 		print $pf "internal:$ncpass\n"; 
                   6197: 	    } else {
                   6198: 		$result = "pass_file_failed_error";
                   6199: 	    }
1.91      albertel 6200: 	}
                   6201:     } elsif ($umode eq 'localauth') {
                   6202: 	{
                   6203: 	    my $pf = IO::File->new(">$passfilename");
1.261     foxr     6204: 	    if($pf) {
                   6205: 		print $pf "localauth:$npass\n";
                   6206: 	    } else {
                   6207: 		$result = "pass_file_failed_error";
                   6208: 	    }
1.91      albertel 6209: 	}
                   6210:     } elsif ($umode eq 'unix') {
                   6211: 	{
1.186     foxr     6212: 	    #
                   6213: 	    #  Don't allow the creation of privileged accounts!!! that would
                   6214: 	    #  be real bad!!!
                   6215: 	    #
                   6216: 	    my $uid = getpwnam($uname);
                   6217: 	    if((defined $uid) && ($uid == 0)) {
                   6218: 		&logthis(">>>Attempted to create privilged account blocked");
                   6219: 		return "no_priv_account_error\n";
                   6220: 	    }
                   6221: 
1.223     foxr     6222: 	    my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
1.224     foxr     6223: 
                   6224: 	    my $lc_error_file  = $execdir."/tmp/lcuseradd".$$.".status";
1.91      albertel 6225: 	    {
                   6226: 		&Debug("Executing external: ".$execpath);
1.98      foxr     6227: 		&Debug("user  = ".$uname.", Password =". $npass);
1.132     matthew  6228: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91      albertel 6229: 		print $se "$uname\n";
                   6230: 		print $se "$npass\n";
                   6231: 		print $se "$npass\n";
1.223     foxr     6232: 		print $se "$lc_error_file\n"; # Status -> unique file.
1.97      foxr     6233: 	    }
1.285     foxr     6234: 	    if (-r $lc_error_file) {
                   6235: 		&Debug("Opening error file: $lc_error_file");
                   6236: 		my $error = IO::File->new("< $lc_error_file");
                   6237: 		my $useraddok = <$error>;
                   6238: 		$error->close;
                   6239: 		unlink($lc_error_file);
                   6240: 		
                   6241: 		chomp $useraddok;
                   6242: 	
                   6243: 		if($useraddok > 0) {
                   6244: 		    my $error_text = &lcuseraddstrerror($useraddok);
                   6245: 		    &logthis("Failed lcuseradd: $error_text");
                   6246: 		    $result = "lcuseradd_failed:$error_text\n";
                   6247: 		}  else {
                   6248: 		    my $pf = IO::File->new(">$passfilename");
                   6249: 		    if($pf) {
                   6250: 			print $pf "unix:\n";
                   6251: 		    } else {
                   6252: 			$result = "pass_file_failed_error";
                   6253: 		    }
                   6254: 		}
1.224     foxr     6255: 	    }  else {
1.285     foxr     6256: 		&Debug("Could not locate lcuseradd error: $lc_error_file");
                   6257: 		$result="bug_lcuseradd_no_output_file";
1.91      albertel 6258: 	    }
                   6259: 	}
                   6260:     } elsif ($umode eq 'none') {
                   6261: 	{
1.223     foxr     6262: 	    my $pf = IO::File->new("> $passfilename");
1.261     foxr     6263: 	    if($pf) {
                   6264: 		print $pf "none:\n";
                   6265: 	    } else {
                   6266: 		$result = "pass_file_failed_error";
                   6267: 	    }
1.91      albertel 6268: 	}
                   6269:     } else {
                   6270: 	$result="auth_mode_error\n";
                   6271:     }
                   6272:     return $result;
1.121     albertel 6273: }
                   6274: 
1.265     albertel 6275: sub convert_photo {
                   6276:     my ($start,$dest)=@_;
                   6277:     system("convert $start $dest");
                   6278: }
                   6279: 
1.121     albertel 6280: sub sethost {
                   6281:     my ($remotereq) = @_;
                   6282:     my (undef,$hostid)=split(/:/,$remotereq);
1.322     albertel 6283:     # ignore sethost if we are already correct
                   6284:     if ($hostid eq $currenthostid) {
                   6285: 	return 'ok';
                   6286:     }
                   6287: 
1.121     albertel 6288:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
                   6289:     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
1.200     matthew  6290: 	$currenthostid  =$hostid;
1.121     albertel 6291: 	$currentdomainid=$hostdom{$hostid};
                   6292: 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
                   6293:     } else {
                   6294: 	&logthis("Requested host id $hostid not an alias of ".
                   6295: 		 $perlvar{'lonHostID'}." refusing connection");
                   6296: 	return 'unable_to_set';
                   6297:     }
                   6298:     return 'ok';
                   6299: }
                   6300: 
                   6301: sub version {
                   6302:     my ($userinput)=@_;
                   6303:     $remoteVERSION=(split(/:/,$userinput))[1];
                   6304:     return "version:$VERSION";
1.127     albertel 6305: }
1.178     foxr     6306: 
1.128     albertel 6307: #There is a copy of this in lonnet.pm
1.127     albertel 6308: sub userload {
                   6309:     my $numusers=0;
                   6310:     {
                   6311: 	opendir(LONIDS,$perlvar{'lonIDsDir'});
                   6312: 	my $filename;
                   6313: 	my $curtime=time;
                   6314: 	while ($filename=readdir(LONIDS)) {
                   6315: 	    if ($filename eq '.' || $filename eq '..') {next;}
1.138     albertel 6316: 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159     albertel 6317: 	    if ($curtime-$mtime < 1800) { $numusers++; }
1.127     albertel 6318: 	}
                   6319: 	closedir(LONIDS);
                   6320:     }
                   6321:     my $userloadpercent=0;
                   6322:     my $maxuserload=$perlvar{'lonUserLoadLim'};
                   6323:     if ($maxuserload) {
1.129     albertel 6324: 	$userloadpercent=100*$numusers/$maxuserload;
1.127     albertel 6325:     }
1.130     albertel 6326:     $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127     albertel 6327:     return $userloadpercent;
1.91      albertel 6328: }
                   6329: 
1.205     raeburn  6330: # Routines for serializing arrays and hashes (copies from lonnet)
                   6331: 
                   6332: sub array2str {
                   6333:   my (@array) = @_;
                   6334:   my $result=&arrayref2str(\@array);
                   6335:   $result=~s/^__ARRAY_REF__//;
                   6336:   $result=~s/__END_ARRAY_REF__$//;
                   6337:   return $result;
                   6338: }
                   6339:                                                                                  
                   6340: sub arrayref2str {
                   6341:   my ($arrayref) = @_;
                   6342:   my $result='__ARRAY_REF__';
                   6343:   foreach my $elem (@$arrayref) {
                   6344:     if(ref($elem) eq 'ARRAY') {
                   6345:       $result.=&arrayref2str($elem).'&';
                   6346:     } elsif(ref($elem) eq 'HASH') {
                   6347:       $result.=&hashref2str($elem).'&';
                   6348:     } elsif(ref($elem)) {
                   6349:       #print("Got a ref of ".(ref($elem))." skipping.");
                   6350:     } else {
                   6351:       $result.=&escape($elem).'&';
                   6352:     }
                   6353:   }
                   6354:   $result=~s/\&$//;
                   6355:   $result .= '__END_ARRAY_REF__';
                   6356:   return $result;
                   6357: }
                   6358:                                                                                  
                   6359: sub hash2str {
                   6360:   my (%hash) = @_;
                   6361:   my $result=&hashref2str(\%hash);
                   6362:   $result=~s/^__HASH_REF__//;
                   6363:   $result=~s/__END_HASH_REF__$//;
                   6364:   return $result;
                   6365: }
                   6366:                                                                                  
                   6367: sub hashref2str {
                   6368:   my ($hashref)=@_;
                   6369:   my $result='__HASH_REF__';
                   6370:   foreach (sort(keys(%$hashref))) {
                   6371:     if (ref($_) eq 'ARRAY') {
                   6372:       $result.=&arrayref2str($_).'=';
                   6373:     } elsif (ref($_) eq 'HASH') {
                   6374:       $result.=&hashref2str($_).'=';
                   6375:     } elsif (ref($_)) {
                   6376:       $result.='=';
                   6377:       #print("Got a ref of ".(ref($_))." skipping.");
                   6378:     } else {
                   6379:         if ($_) {$result.=&escape($_).'=';} else { last; }
                   6380:     }
                   6381: 
                   6382:     if(ref($hashref->{$_}) eq 'ARRAY') {
                   6383:       $result.=&arrayref2str($hashref->{$_}).'&';
                   6384:     } elsif(ref($hashref->{$_}) eq 'HASH') {
                   6385:       $result.=&hashref2str($hashref->{$_}).'&';
                   6386:     } elsif(ref($hashref->{$_})) {
                   6387:        $result.='&';
                   6388:       #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
                   6389:     } else {
                   6390:       $result.=&escape($hashref->{$_}).'&';
                   6391:     }
                   6392:   }
                   6393:   $result=~s/\&$//;
                   6394:   $result .= '__END_HASH_REF__';
                   6395:   return $result;
                   6396: }
1.200     matthew  6397: 
1.61      harris41 6398: # ----------------------------------- POD (plain old documentation, CPAN style)
                   6399: 
                   6400: =head1 NAME
                   6401: 
                   6402: lond - "LON Daemon" Server (port "LOND" 5663)
                   6403: 
                   6404: =head1 SYNOPSIS
                   6405: 
1.74      harris41 6406: Usage: B<lond>
                   6407: 
                   6408: Should only be run as user=www.  This is a command-line script which
                   6409: is invoked by B<loncron>.  There is no expectation that a typical user
                   6410: will manually start B<lond> from the command-line.  (In other words,
                   6411: DO NOT START B<lond> YOURSELF.)
1.61      harris41 6412: 
                   6413: =head1 DESCRIPTION
                   6414: 
1.74      harris41 6415: There are two characteristics associated with the running of B<lond>,
                   6416: PROCESS MANAGEMENT (starting, stopping, handling child processes)
                   6417: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
                   6418: subscriptions, etc).  These are described in two large
                   6419: sections below.
                   6420: 
                   6421: B<PROCESS MANAGEMENT>
                   6422: 
1.61      harris41 6423: Preforker - server who forks first. Runs as a daemon. HUPs.
                   6424: Uses IDEA encryption
                   6425: 
1.74      harris41 6426: B<lond> forks off children processes that correspond to the other servers
                   6427: in the network.  Management of these processes can be done at the
                   6428: parent process level or the child process level.
                   6429: 
                   6430: B<logs/lond.log> is the location of log messages.
                   6431: 
                   6432: The process management is now explained in terms of linux shell commands,
                   6433: subroutines internal to this code, and signal assignments:
                   6434: 
                   6435: =over 4
                   6436: 
                   6437: =item *
                   6438: 
                   6439: PID is stored in B<logs/lond.pid>
                   6440: 
                   6441: This is the process id number of the parent B<lond> process.
                   6442: 
                   6443: =item *
                   6444: 
                   6445: SIGTERM and SIGINT
                   6446: 
                   6447: Parent signal assignment:
                   6448:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   6449: 
                   6450: Child signal assignment:
                   6451:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
                   6452: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
                   6453:  to restart a new child.)
                   6454: 
                   6455: Command-line invocations:
                   6456:  B<kill> B<-s> SIGTERM I<PID>
                   6457:  B<kill> B<-s> SIGINT I<PID>
                   6458: 
                   6459: Subroutine B<HUNTSMAN>:
                   6460:  This is only invoked for the B<lond> parent I<PID>.
                   6461: This kills all the children, and then the parent.
                   6462: The B<lonc.pid> file is cleared.
                   6463: 
                   6464: =item *
                   6465: 
                   6466: SIGHUP
                   6467: 
                   6468: Current bug:
                   6469:  This signal can only be processed the first time
                   6470: on the parent process.  Subsequent SIGHUP signals
                   6471: have no effect.
                   6472: 
                   6473: Parent signal assignment:
                   6474:  $SIG{HUP}  = \&HUPSMAN;
                   6475: 
                   6476: Child signal assignment:
                   6477:  none (nothing happens)
                   6478: 
                   6479: Command-line invocations:
                   6480:  B<kill> B<-s> SIGHUP I<PID>
                   6481: 
                   6482: Subroutine B<HUPSMAN>:
                   6483:  This is only invoked for the B<lond> parent I<PID>,
                   6484: This kills all the children, and then the parent.
                   6485: The B<lond.pid> file is cleared.
                   6486: 
                   6487: =item *
                   6488: 
                   6489: SIGUSR1
                   6490: 
                   6491: Parent signal assignment:
                   6492:  $SIG{USR1} = \&USRMAN;
                   6493: 
                   6494: Child signal assignment:
                   6495:  $SIG{USR1}= \&logstatus;
                   6496: 
                   6497: Command-line invocations:
                   6498:  B<kill> B<-s> SIGUSR1 I<PID>
                   6499: 
                   6500: Subroutine B<USRMAN>:
                   6501:  When invoked for the B<lond> parent I<PID>,
                   6502: SIGUSR1 is sent to all the children, and the status of
                   6503: each connection is logged.
1.144     foxr     6504: 
                   6505: =item *
                   6506: 
                   6507: SIGUSR2
                   6508: 
                   6509: Parent Signal assignment:
                   6510:     $SIG{USR2} = \&UpdateHosts
                   6511: 
                   6512: Child signal assignment:
                   6513:     NONE
                   6514: 
1.74      harris41 6515: 
                   6516: =item *
                   6517: 
                   6518: SIGCHLD
                   6519: 
                   6520: Parent signal assignment:
                   6521:  $SIG{CHLD} = \&REAPER;
                   6522: 
                   6523: Child signal assignment:
                   6524:  none
                   6525: 
                   6526: Command-line invocations:
                   6527:  B<kill> B<-s> SIGCHLD I<PID>
                   6528: 
                   6529: Subroutine B<REAPER>:
                   6530:  This is only invoked for the B<lond> parent I<PID>.
                   6531: Information pertaining to the child is removed.
                   6532: The socket port is cleaned up.
                   6533: 
                   6534: =back
                   6535: 
                   6536: B<SERVER-SIDE ACTIVITIES>
                   6537: 
                   6538: Server-side information can be accepted in an encrypted or non-encrypted
                   6539: method.
                   6540: 
                   6541: =over 4
                   6542: 
                   6543: =item ping
                   6544: 
                   6545: Query a client in the hosts.tab table; "Are you there?"
                   6546: 
                   6547: =item pong
                   6548: 
                   6549: Respond to a ping query.
                   6550: 
                   6551: =item ekey
                   6552: 
                   6553: Read in encrypted key, make cipher.  Respond with a buildkey.
                   6554: 
                   6555: =item load
                   6556: 
                   6557: Respond with CPU load based on a computation upon /proc/loadavg.
                   6558: 
                   6559: =item currentauth
                   6560: 
                   6561: Reply with current authentication information (only over an
                   6562: encrypted channel).
                   6563: 
                   6564: =item auth
                   6565: 
                   6566: Only over an encrypted channel, reply as to whether a user's
                   6567: authentication information can be validated.
                   6568: 
                   6569: =item passwd
                   6570: 
                   6571: Allow for a password to be set.
                   6572: 
                   6573: =item makeuser
                   6574: 
                   6575: Make a user.
                   6576: 
                   6577: =item passwd
                   6578: 
                   6579: Allow for authentication mechanism and password to be changed.
                   6580: 
                   6581: =item home
1.61      harris41 6582: 
1.74      harris41 6583: Respond to a question "are you the home for a given user?"
                   6584: 
                   6585: =item update
                   6586: 
                   6587: Update contents of a subscribed resource.
                   6588: 
                   6589: =item unsubscribe
                   6590: 
                   6591: The server is unsubscribing from a resource.
                   6592: 
                   6593: =item subscribe
                   6594: 
                   6595: The server is subscribing to a resource.
                   6596: 
                   6597: =item log
                   6598: 
                   6599: Place in B<logs/lond.log>
                   6600: 
                   6601: =item put
                   6602: 
                   6603: stores hash in namespace
                   6604: 
1.230     foxr     6605: =item rolesputy
1.74      harris41 6606: 
                   6607: put a role into a user's environment
                   6608: 
                   6609: =item get
                   6610: 
                   6611: returns hash with keys from array
                   6612: reference filled in from namespace
                   6613: 
                   6614: =item eget
                   6615: 
                   6616: returns hash with keys from array
                   6617: reference filled in from namesp (encrypts the return communication)
                   6618: 
                   6619: =item rolesget
                   6620: 
                   6621: get a role from a user's environment
                   6622: 
                   6623: =item del
                   6624: 
                   6625: deletes keys out of array from namespace
                   6626: 
                   6627: =item keys
                   6628: 
                   6629: returns namespace keys
                   6630: 
                   6631: =item dump
                   6632: 
                   6633: dumps the complete (or key matching regexp) namespace into a hash
                   6634: 
                   6635: =item store
                   6636: 
                   6637: stores hash permanently
                   6638: for this url; hashref needs to be given and should be a \%hashname; the
                   6639: remaining args aren't required and if they aren't passed or are '' they will
                   6640: be derived from the ENV
                   6641: 
                   6642: =item restore
                   6643: 
                   6644: returns a hash for a given url
                   6645: 
                   6646: =item querysend
                   6647: 
                   6648: Tells client about the lonsql process that has been launched in response
                   6649: to a sent query.
                   6650: 
                   6651: =item queryreply
                   6652: 
                   6653: Accept information from lonsql and make appropriate storage in temporary
                   6654: file space.
                   6655: 
                   6656: =item idput
                   6657: 
                   6658: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
                   6659: for each student, defined perhaps by the institutional Registrar.)
                   6660: 
                   6661: =item idget
                   6662: 
                   6663: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
                   6664: for each student, defined perhaps by the institutional Registrar.)
                   6665: 
                   6666: =item tmpput
                   6667: 
                   6668: Accept and store information in temporary space.
                   6669: 
                   6670: =item tmpget
                   6671: 
                   6672: Send along temporarily stored information.
                   6673: 
                   6674: =item ls
                   6675: 
                   6676: List part of a user's directory.
                   6677: 
1.135     foxr     6678: =item pushtable
                   6679: 
                   6680: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
                   6681: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
                   6682: must be restored manually in case of a problem with the new table file.
                   6683: pushtable requires that the request be encrypted and validated via
                   6684: ValidateManager.  The form of the command is:
                   6685: enc:pushtable tablename <tablecontents> \n
                   6686: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
                   6687: cleartext newline.
                   6688: 
1.74      harris41 6689: =item Hanging up (exit or init)
                   6690: 
                   6691: What to do when a client tells the server that they (the client)
                   6692: are leaving the network.
                   6693: 
                   6694: =item unknown command
                   6695: 
                   6696: If B<lond> is sent an unknown command (not in the list above),
                   6697: it replys to the client "unknown_cmd".
1.135     foxr     6698: 
1.74      harris41 6699: 
                   6700: =item UNKNOWN CLIENT
                   6701: 
                   6702: If the anti-spoofing algorithm cannot verify the client,
                   6703: the client is rejected (with a "refused" message sent
                   6704: to the client, and the connection is closed.
                   6705: 
                   6706: =back
1.61      harris41 6707: 
                   6708: =head1 PREREQUISITES
                   6709: 
                   6710: IO::Socket
                   6711: IO::File
                   6712: Apache::File
                   6713: POSIX
                   6714: Crypt::IDEA
                   6715: LWP::UserAgent()
                   6716: GDBM_File
                   6717: Authen::Krb4
1.91      albertel 6718: Authen::Krb5
1.61      harris41 6719: 
                   6720: =head1 COREQUISITES
                   6721: 
                   6722: =head1 OSNAMES
                   6723: 
                   6724: linux
                   6725: 
                   6726: =head1 SCRIPT CATEGORIES
                   6727: 
                   6728: Server/Process
                   6729: 
                   6730: =cut

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