Annotation of loncom/lond, revision 1.334

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network
                      3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60      www         4: #
1.334   ! albertel    5: # $Id: lond,v 1.333 2006/06/07 01:49:43 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();
1.3       www        43: use GDBM_File;
                     44: use Authen::Krb4;
1.91      albertel   45: use Authen::Krb5;
1.49      albertel   46: use lib '/home/httpd/lib/perl/';
                     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: 
1.334   ! albertel   62: my $VERSION='$Revision: 1.333 $'; #' 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: 
1.166     foxr      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) {
1.166     foxr      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: 		
1.166     foxr      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: 		
1.166     foxr      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: 	}
1.166     foxr      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:     #
                    838:     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
                    839:     my $BinaryIp = gethostbyname($name);
                    840:     my $ip       = inet_ntoa($ip);
                    841:     #
                    842:     #  Reassemble the config line from the elements in the list.
                    843:     #  Note that if the loncnew items were not present before, they will
                    844:     #  be now even if they would be empty
                    845:     #
                    846:     my $newConfigLine = $id;
                    847:     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
                    848: 	$newConfigLine .= ":".$item;
                    849:     }
                    850:     #  Replace the line:
                    851: 
                    852:     $editor->ReplaceLine($id, $newConfigLine);
                    853:     
                    854: }
                    855: #
                    856: #   ReplaceConfigFile:
                    857: #              Replaces a configuration file with the contents of a
                    858: #              configuration file editor object.
                    859: #              This is done by:
                    860: #              - Copying the target file to <filename>.old
                    861: #              - Writing the new file to <filename>.tmp
                    862: #              - Moving <filename.tmp>  -> <filename>
                    863: #              This laborious process ensures that the system is never without
                    864: #              a configuration file that's at least valid (even if the contents
                    865: #              may be dated).
                    866: #   Parameters:
                    867: #        filename   - Name of the file to modify... this is a full path.
                    868: #        editor     - Editor containing the file.
                    869: #
                    870: sub ReplaceConfigFile {
1.192     foxr      871:     
                    872:     my ($filename, $editor) = @_;
1.168     foxr      873: 
1.169     foxr      874:     CopyFile ($filename, $filename.".old");
                    875: 
                    876:     my $contents  = $editor->Get(); # Get the contents of the file.
                    877: 
                    878:     InstallFile($filename, $contents);
                    879: }
1.168     foxr      880: #   
                    881: #
                    882: #   Called to edit a configuration table  file
1.167     foxr      883: #   Parameters:
                    884: #      request           - The entire command/request sent by lonc or lonManage
                    885: #   Return:
                    886: #      The reply to send to the client.
1.168     foxr      887: #
1.167     foxr      888: sub EditFile {
                    889:     my $request = shift;
                    890: 
                    891:     #  Split the command into it's pieces:  edit:filetype:script
                    892: 
1.168     foxr      893:     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
1.167     foxr      894: 
                    895:     #  Check the pre-coditions for success:
                    896: 
                    897:     if($request != "edit") {	# Something is amiss afoot alack.
                    898: 	return "error:edit request detected, but request != 'edit'\n";
                    899:     }
                    900:     if( ($filetype ne "hosts")  &&
                    901: 	($filetype ne "domain")) {
                    902: 	return "error:edit requested with invalid file specifier: $filetype \n";
                    903:     }
                    904: 
                    905:     #   Split the edit script and check it's validity.
1.168     foxr      906: 
                    907:     my @scriptlines = split(/\n/, $script);  # one line per element.
                    908:     my $linecount   = scalar(@scriptlines);
                    909:     for(my $i = 0; $i < $linecount; $i++) {
                    910: 	chomp($scriptlines[$i]);
                    911: 	if(!isValidEditCommand($scriptlines[$i])) {
                    912: 	    return "error:edit with bad script line: '$scriptlines[$i]' \n";
                    913: 	}
                    914:     }
1.145     foxr      915: 
1.167     foxr      916:     #   Execute the edit operation.
1.169     foxr      917:     #   - Create a config file editor for the appropriate file and 
                    918:     #   - execute each command in the script:
                    919:     #
                    920:     my $configfile = ConfigFileFromSelector($filetype);
                    921:     if (!(defined $configfile)) {
                    922: 	return "refused\n";
                    923:     }
                    924:     my $editor = ConfigFileEdit->new($configfile);
1.167     foxr      925: 
1.169     foxr      926:     for (my $i = 0; $i < $linecount; $i++) {
                    927: 	ApplyEdit($scriptlines[$i], $editor);
                    928:     }
                    929:     # If the file is the host file, ensure that our host is
                    930:     # adjusted to have our ip:
                    931:     #
                    932:     if($filetype eq "host") {
                    933: 	AdjustOurHost($editor);
                    934:     }
                    935:     #  Finally replace the current file with our file.
                    936:     #
                    937:     ReplaceConfigFile($configfile, $editor);
1.167     foxr      938: 
                    939:     return "ok\n";
                    940: }
1.207     foxr      941: 
1.255     foxr      942: #   read_profile
                    943: #
                    944: #   Returns a set of specific entries from a user's profile file.
                    945: #   this is a utility function that is used by both get_profile_entry and
                    946: #   get_profile_entry_encrypted.
                    947: #
                    948: # Parameters:
                    949: #    udom       - Domain in which the user exists.
                    950: #    uname      - User's account name (loncapa account)
                    951: #    namespace  - The profile namespace to open.
                    952: #    what       - A set of & separated queries.
                    953: # Returns:
                    954: #    If all ok: - The string that needs to be shipped back to the user.
                    955: #    If failure - A string that starts with error: followed by the failure
                    956: #                 reason.. note that this probabyl gets shipped back to the
                    957: #                 user as well.
                    958: #
                    959: sub read_profile {
                    960:     my ($udom, $uname, $namespace, $what) = @_;
                    961:     
                    962:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                    963: 				 &GDBM_READER());
                    964:     if ($hashref) {
                    965:         my @queries=split(/\&/,$what);
                    966:         my $qresult='';
                    967: 	
                    968: 	for (my $i=0;$i<=$#queries;$i++) {
                    969: 	    $qresult.="$hashref->{$queries[$i]}&";    # Presumably failure gives empty string.
                    970: 	}
                    971: 	$qresult=~s/\&$//;              # Remove trailing & from last lookup.
1.311     albertel  972: 	if (&untie_user_hash($hashref)) {
1.255     foxr      973: 	    return $qresult;
                    974: 	} else {
                    975: 	    return "error: ".($!+0)." untie (GDBM) Failed";
                    976: 	}
                    977:     } else {
                    978: 	if ($!+0 == 2) {
                    979: 	    return "error:No such file or GDBM reported bad block error";
                    980: 	} else {
                    981: 	    return "error: ".($!+0)." tie (GDBM) Failed";
                    982: 	}
                    983:     }
                    984: 
                    985: }
1.214     foxr      986: #--------------------- Request Handlers --------------------------------------------
                    987: #
1.215     foxr      988: #   By convention each request handler registers itself prior to the sub 
                    989: #   declaration:
1.214     foxr      990: #
                    991: 
1.216     foxr      992: #++
                    993: #
1.214     foxr      994: #  Handles ping requests.
                    995: #  Parameters:
                    996: #      $cmd    - the actual keyword that invoked us.
                    997: #      $tail   - the tail of the request that invoked us.
                    998: #      $replyfd- File descriptor connected to the client
                    999: #  Implicit Inputs:
                   1000: #      $currenthostid - Global variable that carries the name of the host we are
                   1001: #                       known as.
                   1002: #  Returns:
                   1003: #      1       - Ok to continue processing.
                   1004: #      0       - Program should exit.
                   1005: #  Side effects:
                   1006: #      Reply information is sent to the client.
                   1007: sub ping_handler {
                   1008:     my ($cmd, $tail, $client) = @_;
                   1009:     Debug("$cmd $tail $client .. $currenthostid:");
                   1010:    
                   1011:     Reply( $client,"$currenthostid\n","$cmd:$tail");
                   1012:    
                   1013:     return 1;
                   1014: }
                   1015: &register_handler("ping", \&ping_handler, 0, 1, 1);       # Ping unencoded, client or manager.
                   1016: 
1.216     foxr     1017: #++
1.215     foxr     1018: #
                   1019: # Handles pong requests.  Pong replies with our current host id, and
                   1020: #                         the results of a ping sent to us via our lonc.
                   1021: #
                   1022: # Parameters:
                   1023: #      $cmd    - the actual keyword that invoked us.
                   1024: #      $tail   - the tail of the request that invoked us.
                   1025: #      $replyfd- File descriptor connected to the client
                   1026: #  Implicit Inputs:
                   1027: #      $currenthostid - Global variable that carries the name of the host we are
                   1028: #                       connected to.
                   1029: #  Returns:
                   1030: #      1       - Ok to continue processing.
                   1031: #      0       - Program should exit.
                   1032: #  Side effects:
                   1033: #      Reply information is sent to the client.
                   1034: sub pong_handler {
                   1035:     my ($cmd, $tail, $replyfd) = @_;
                   1036: 
                   1037:     my $reply=&reply("ping",$clientname);
                   1038:     &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
                   1039:     return 1;
                   1040: }
                   1041: &register_handler("pong", \&pong_handler, 0, 1, 1);       # Pong unencoded, client or manager
                   1042: 
1.216     foxr     1043: #++
                   1044: #      Called to establish an encrypted session key with the remote client.
                   1045: #      Note that with secure lond, in most cases this function is never
                   1046: #      invoked.  Instead, the secure session key is established either
                   1047: #      via a local file that's locked down tight and only lives for a short
                   1048: #      time, or via an ssl tunnel...and is generated from a bunch-o-random
                   1049: #      bits from /dev/urandom, rather than the predictable pattern used by
                   1050: #      by this sub.  This sub is only used in the old-style insecure
                   1051: #      key negotiation.
                   1052: # Parameters:
                   1053: #      $cmd    - the actual keyword that invoked us.
                   1054: #      $tail   - the tail of the request that invoked us.
                   1055: #      $replyfd- File descriptor connected to the client
                   1056: #  Implicit Inputs:
                   1057: #      $currenthostid - Global variable that carries the name of the host
                   1058: #                       known as.
                   1059: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
                   1060: #  Returns:
                   1061: #      1       - Ok to continue processing.
                   1062: #      0       - Program should exit.
                   1063: #  Implicit Outputs:
                   1064: #      Reply information is sent to the client.
                   1065: #      $cipher is set with a reference to a new IDEA encryption object.
                   1066: #
                   1067: sub establish_key_handler {
                   1068:     my ($cmd, $tail, $replyfd) = @_;
                   1069: 
                   1070:     my $buildkey=time.$$.int(rand 100000);
                   1071:     $buildkey=~tr/1-6/A-F/;
                   1072:     $buildkey=int(rand 100000).$buildkey.int(rand 100000);
                   1073:     my $key=$currenthostid.$clientname;
                   1074:     $key=~tr/a-z/A-Z/;
                   1075:     $key=~tr/G-P/0-9/;
                   1076:     $key=~tr/Q-Z/0-9/;
                   1077:     $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
                   1078:     $key=substr($key,0,32);
                   1079:     my $cipherkey=pack("H32",$key);
                   1080:     $cipher=new IDEA $cipherkey;
                   1081:     &Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 
                   1082:    
                   1083:     return 1;
                   1084: 
                   1085: }
                   1086: &register_handler("ekey", \&establish_key_handler, 0, 1,1);
                   1087: 
1.217     foxr     1088: #     Handler for the load command.  Returns the current system load average
                   1089: #     to the requestor.
                   1090: #
                   1091: # Parameters:
                   1092: #      $cmd    - the actual keyword that invoked us.
                   1093: #      $tail   - the tail of the request that invoked us.
                   1094: #      $replyfd- File descriptor connected to the client
                   1095: #  Implicit Inputs:
                   1096: #      $currenthostid - Global variable that carries the name of the host
                   1097: #                       known as.
                   1098: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
                   1099: #  Returns:
                   1100: #      1       - Ok to continue processing.
                   1101: #      0       - Program should exit.
                   1102: #  Side effects:
                   1103: #      Reply information is sent to the client.
                   1104: sub load_handler {
                   1105:     my ($cmd, $tail, $replyfd) = @_;
                   1106: 
                   1107:    # Get the load average from /proc/loadavg and calculate it as a percentage of
                   1108:    # the allowed load limit as set by the perl global variable lonLoadLim
                   1109: 
                   1110:     my $loadavg;
                   1111:     my $loadfile=IO::File->new('/proc/loadavg');
                   1112:    
                   1113:     $loadavg=<$loadfile>;
                   1114:     $loadavg =~ s/\s.*//g;                      # Extract the first field only.
                   1115:    
                   1116:     my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
                   1117: 
                   1118:     &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
                   1119:    
                   1120:     return 1;
                   1121: }
1.263     albertel 1122: &register_handler("load", \&load_handler, 0, 1, 0);
1.217     foxr     1123: 
                   1124: #
                   1125: #   Process the userload request.  This sub returns to the client the current
                   1126: #  user load average.  It can be invoked either by clients or managers.
                   1127: #
                   1128: # Parameters:
                   1129: #      $cmd    - the actual keyword that invoked us.
                   1130: #      $tail   - the tail of the request that invoked us.
                   1131: #      $replyfd- File descriptor connected to the client
                   1132: #  Implicit Inputs:
                   1133: #      $currenthostid - Global variable that carries the name of the host
                   1134: #                       known as.
                   1135: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
                   1136: #  Returns:
                   1137: #      1       - Ok to continue processing.
                   1138: #      0       - Program should exit
                   1139: # Implicit inputs:
                   1140: #     whatever the userload() function requires.
                   1141: #  Implicit outputs:
                   1142: #     the reply is written to the client.
                   1143: #
                   1144: sub user_load_handler {
                   1145:     my ($cmd, $tail, $replyfd) = @_;
                   1146: 
                   1147:     my $userloadpercent=&userload();
                   1148:     &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
                   1149:     
                   1150:     return 1;
                   1151: }
1.263     albertel 1152: &register_handler("userload", \&user_load_handler, 0, 1, 0);
1.217     foxr     1153: 
1.218     foxr     1154: #   Process a request for the authorization type of a user:
                   1155: #   (userauth).
                   1156: #
                   1157: # Parameters:
                   1158: #      $cmd    - the actual keyword that invoked us.
                   1159: #      $tail   - the tail of the request that invoked us.
                   1160: #      $replyfd- File descriptor connected to the client
                   1161: #  Returns:
                   1162: #      1       - Ok to continue processing.
                   1163: #      0       - Program should exit
                   1164: # Implicit outputs:
                   1165: #    The user authorization type is written to the client.
                   1166: #
                   1167: sub user_authorization_type {
                   1168:     my ($cmd, $tail, $replyfd) = @_;
                   1169:    
                   1170:     my $userinput = "$cmd:$tail";
                   1171:    
                   1172:     #  Pull the domain and username out of the command tail.
1.222     foxr     1173:     # and call get_auth_type to determine the authentication type.
1.218     foxr     1174:    
                   1175:     my ($udom,$uname)=split(/:/,$tail);
1.222     foxr     1176:     my $result = &get_auth_type($udom, $uname);
1.218     foxr     1177:     if($result eq "nouser") {
                   1178: 	&Failure( $replyfd, "unknown_user\n", $userinput);
                   1179:     } else {
                   1180: 	#
1.222     foxr     1181: 	# We only want to pass the second field from get_auth_type
1.218     foxr     1182: 	# for ^krb.. otherwise we'll be handing out the encrypted
                   1183: 	# password for internals e.g.
                   1184: 	#
                   1185: 	my ($type,$otherinfo) = split(/:/,$result);
                   1186: 	if($type =~ /^krb/) {
                   1187: 	    $type = $result;
1.269     raeburn  1188: 	} else {
                   1189:             $type .= ':';
                   1190:         }
                   1191: 	&Reply( $replyfd, "$type\n", $userinput);
1.218     foxr     1192:     }
                   1193:   
                   1194:     return 1;
                   1195: }
                   1196: &register_handler("currentauth", \&user_authorization_type, 1, 1, 0);
                   1197: 
                   1198: #   Process a request by a manager to push a hosts or domain table 
                   1199: #   to us.  We pick apart the command and pass it on to the subs
                   1200: #   that already exist to do this.
                   1201: #
                   1202: # Parameters:
                   1203: #      $cmd    - the actual keyword that invoked us.
                   1204: #      $tail   - the tail of the request that invoked us.
                   1205: #      $client - File descriptor connected to the client
                   1206: #  Returns:
                   1207: #      1       - Ok to continue processing.
                   1208: #      0       - Program should exit
                   1209: # Implicit Output:
                   1210: #    a reply is written to the client.
                   1211: sub push_file_handler {
                   1212:     my ($cmd, $tail, $client) = @_;
                   1213: 
                   1214:     my $userinput = "$cmd:$tail";
                   1215: 
                   1216:     # At this time we only know that the IP of our partner is a valid manager
                   1217:     # the code below is a hook to do further authentication (e.g. to resolve
                   1218:     # spoofing).
                   1219: 
                   1220:     my $cert = &GetCertificate($userinput);
                   1221:     if(&ValidManager($cert)) { 
                   1222: 
                   1223: 	# Now presumably we have the bona fides of both the peer host and the
                   1224: 	# process making the request.
                   1225:       
                   1226: 	my $reply = &PushFile($userinput);
                   1227: 	&Reply($client, "$reply\n", $userinput);
                   1228: 
                   1229:     } else {
                   1230: 	&Failure( $client, "refused\n", $userinput);
                   1231:     } 
1.219     foxr     1232:     return 1;
1.218     foxr     1233: }
                   1234: &register_handler("pushfile", \&push_file_handler, 1, 0, 1);
                   1235: 
1.243     banghart 1236: #
                   1237: #   du  - list the disk usuage of a directory recursively. 
                   1238: #    
                   1239: #   note: stolen code from the ls file handler
                   1240: #   under construction by Rick Banghart 
                   1241: #    .
                   1242: # Parameters:
                   1243: #    $cmd        - The command that dispatched us (du).
                   1244: #    $ududir     - The directory path to list... I'm not sure what this
                   1245: #                  is relative as things like ls:. return e.g.
                   1246: #                  no_such_dir.
                   1247: #    $client     - Socket open on the client.
                   1248: # Returns:
                   1249: #     1 - indicating that the daemon should not disconnect.
                   1250: # Side Effects:
                   1251: #   The reply is written to  $client.
                   1252: #
                   1253: sub du_handler {
                   1254:     my ($cmd, $ududir, $client) = @_;
1.251     foxr     1255:     my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
                   1256:     my $userinput = "$cmd:$ududir";
                   1257: 
1.245     albertel 1258:     if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
                   1259: 	&Failure($client,"refused\n","$cmd:$ududir");
                   1260: 	return 1;
                   1261:     }
1.249     foxr     1262:     #  Since $ududir could have some nasties in it,
                   1263:     #  we will require that ududir is a valid
                   1264:     #  directory.  Just in case someone tries to
                   1265:     #  slip us a  line like .;(cd /home/httpd rm -rf*)
                   1266:     #  etc.
                   1267:     #
                   1268:     if (-d $ududir) {
1.292     albertel 1269: 	my $total_size=0;
                   1270: 	my $code=sub { 
                   1271: 	    if ($_=~/\.\d+\./) { return;} 
                   1272: 	    if ($_=~/\.meta$/) { return;}
                   1273: 	    $total_size+=(stat($_))[7];
                   1274: 	};
1.295     raeburn  1275: 	chdir($ududir);
1.292     albertel 1276: 	find($code,$ududir);
                   1277: 	$total_size=int($total_size/1024);
                   1278: 	&Reply($client,"$total_size\n","$cmd:$ududir");
1.249     foxr     1279:     } else {
1.251     foxr     1280: 	&Failure($client, "bad_directory:$ududir\n","$cmd:$ududir"); 
1.249     foxr     1281:     }
1.243     banghart 1282:     return 1;
                   1283: }
                   1284: &register_handler("du", \&du_handler, 0, 1, 0);
1.218     foxr     1285: 
1.239     foxr     1286: #
1.280     matthew  1287: # The ls_handler routine should be considered obosolete and is retained
                   1288: # for communication with legacy servers.  Please see the ls2_handler.
                   1289: #
1.239     foxr     1290: #   ls  - list the contents of a directory.  For each file in the
                   1291: #    selected directory the filename followed by the full output of
                   1292: #    the stat function is returned.  The returned info for each
                   1293: #    file are separated by ':'.  The stat fields are separated by &'s.
                   1294: # Parameters:
                   1295: #    $cmd        - The command that dispatched us (ls).
                   1296: #    $ulsdir     - The directory path to list... I'm not sure what this
                   1297: #                  is relative as things like ls:. return e.g.
                   1298: #                  no_such_dir.
                   1299: #    $client     - Socket open on the client.
                   1300: # Returns:
                   1301: #     1 - indicating that the daemon should not disconnect.
                   1302: # Side Effects:
                   1303: #   The reply is written to  $client.
                   1304: #
                   1305: sub ls_handler {
1.280     matthew  1306:     # obsoleted by ls2_handler
1.239     foxr     1307:     my ($cmd, $ulsdir, $client) = @_;
                   1308: 
                   1309:     my $userinput = "$cmd:$ulsdir";
                   1310: 
                   1311:     my $obs;
                   1312:     my $rights;
                   1313:     my $ulsout='';
                   1314:     my $ulsfn;
                   1315:     if (-e $ulsdir) {
                   1316: 	if(-d $ulsdir) {
                   1317: 	    if (opendir(LSDIR,$ulsdir)) {
                   1318: 		while ($ulsfn=readdir(LSDIR)) {
1.291     albertel 1319: 		    undef($obs);
                   1320: 		    undef($rights); 
1.239     foxr     1321: 		    my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   1322: 		    #We do some obsolete checking here
                   1323: 		    if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                   1324: 			open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                   1325: 			my @obsolete=<FILE>;
                   1326: 			foreach my $obsolete (@obsolete) {
1.301     www      1327: 			    if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
1.239     foxr     1328: 			    if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
                   1329: 			}
                   1330: 		    }
                   1331: 		    $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
                   1332: 		    if($obs eq '1') { $ulsout.="&1"; }
                   1333: 		    else { $ulsout.="&0"; }
                   1334: 		    if($rights eq '1') { $ulsout.="&1:"; }
                   1335: 		    else { $ulsout.="&0:"; }
                   1336: 		}
                   1337: 		closedir(LSDIR);
                   1338: 	    }
                   1339: 	} else {
                   1340: 	    my @ulsstats=stat($ulsdir);
                   1341: 	    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   1342: 	}
                   1343:     } else {
                   1344: 	$ulsout='no_such_dir';
                   1345:     }
                   1346:     if ($ulsout eq '') { $ulsout='empty'; }
1.249     foxr     1347:     &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1.239     foxr     1348:     
                   1349:     return 1;
                   1350: 
                   1351: }
                   1352: &register_handler("ls", \&ls_handler, 0, 1, 0);
                   1353: 
1.280     matthew  1354: #
                   1355: # Please also see the ls_handler, which this routine obosolets.
                   1356: # ls2_handler differs from ls_handler in that it escapes its return 
                   1357: # values before concatenating them together with ':'s.
                   1358: #
                   1359: #   ls2  - list the contents of a directory.  For each file in the
                   1360: #    selected directory the filename followed by the full output of
                   1361: #    the stat function is returned.  The returned info for each
                   1362: #    file are separated by ':'.  The stat fields are separated by &'s.
                   1363: # Parameters:
                   1364: #    $cmd        - The command that dispatched us (ls).
                   1365: #    $ulsdir     - The directory path to list... I'm not sure what this
                   1366: #                  is relative as things like ls:. return e.g.
                   1367: #                  no_such_dir.
                   1368: #    $client     - Socket open on the client.
                   1369: # Returns:
                   1370: #     1 - indicating that the daemon should not disconnect.
                   1371: # Side Effects:
                   1372: #   The reply is written to  $client.
                   1373: #
                   1374: sub ls2_handler {
                   1375:     my ($cmd, $ulsdir, $client) = @_;
                   1376: 
                   1377:     my $userinput = "$cmd:$ulsdir";
                   1378: 
                   1379:     my $obs;
                   1380:     my $rights;
                   1381:     my $ulsout='';
                   1382:     my $ulsfn;
                   1383:     if (-e $ulsdir) {
                   1384:         if(-d $ulsdir) {
                   1385:             if (opendir(LSDIR,$ulsdir)) {
                   1386:                 while ($ulsfn=readdir(LSDIR)) {
1.291     albertel 1387:                     undef($obs);
                   1388: 		    undef($rights); 
1.280     matthew  1389:                     my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   1390:                     #We do some obsolete checking here
                   1391:                     if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                   1392:                         open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                   1393:                         my @obsolete=<FILE>;
                   1394:                         foreach my $obsolete (@obsolete) {
1.301     www      1395:                             if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; } 
1.280     matthew  1396:                             if($obsolete =~ m|(<copyright>)(default)|) {
                   1397:                                 $rights = 1;
                   1398:                             }
                   1399:                         }
                   1400:                     }
                   1401:                     my $tmp = $ulsfn.'&'.join('&',@ulsstats);
                   1402:                     if ($obs    eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                   1403:                     if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
                   1404:                     $ulsout.= &escape($tmp).':';
                   1405:                 }
                   1406:                 closedir(LSDIR);
                   1407:             }
                   1408:         } else {
                   1409:             my @ulsstats=stat($ulsdir);
                   1410:             $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   1411:         }
                   1412:     } else {
                   1413:         $ulsout='no_such_dir';
                   1414:    }
                   1415:    if ($ulsout eq '') { $ulsout='empty'; }
                   1416:    &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
                   1417:    return 1;
                   1418: }
                   1419: &register_handler("ls2", \&ls2_handler, 0, 1, 0);
                   1420: 
1.218     foxr     1421: #   Process a reinit request.  Reinit requests that either
                   1422: #   lonc or lond be reinitialized so that an updated 
                   1423: #   host.tab or domain.tab can be processed.
                   1424: #
                   1425: # Parameters:
                   1426: #      $cmd    - the actual keyword that invoked us.
                   1427: #      $tail   - the tail of the request that invoked us.
                   1428: #      $client - File descriptor connected to the client
                   1429: #  Returns:
                   1430: #      1       - Ok to continue processing.
                   1431: #      0       - Program should exit
                   1432: #  Implicit output:
                   1433: #     a reply is sent to the client.
                   1434: #
                   1435: sub reinit_process_handler {
                   1436:     my ($cmd, $tail, $client) = @_;
                   1437:    
                   1438:     my $userinput = "$cmd:$tail";
                   1439:    
                   1440:     my $cert = &GetCertificate($userinput);
                   1441:     if(&ValidManager($cert)) {
                   1442: 	chomp($userinput);
                   1443: 	my $reply = &ReinitProcess($userinput);
                   1444: 	&Reply( $client,  "$reply\n", $userinput);
                   1445:     } else {
                   1446: 	&Failure( $client, "refused\n", $userinput);
                   1447:     }
                   1448:     return 1;
                   1449: }
                   1450: &register_handler("reinit", \&reinit_process_handler, 1, 0, 1);
                   1451: 
                   1452: #  Process the editing script for a table edit operation.
                   1453: #  the editing operation must be encrypted and requested by
                   1454: #  a manager host.
                   1455: #
                   1456: # Parameters:
                   1457: #      $cmd    - the actual keyword that invoked us.
                   1458: #      $tail   - the tail of the request that invoked us.
                   1459: #      $client - File descriptor connected to the client
                   1460: #  Returns:
                   1461: #      1       - Ok to continue processing.
                   1462: #      0       - Program should exit
                   1463: #  Implicit output:
                   1464: #     a reply is sent to the client.
                   1465: #
                   1466: sub edit_table_handler {
                   1467:     my ($command, $tail, $client) = @_;
                   1468:    
                   1469:     my $userinput = "$command:$tail";
                   1470: 
                   1471:     my $cert = &GetCertificate($userinput);
                   1472:     if(&ValidManager($cert)) {
                   1473: 	my($filetype, $script) = split(/:/, $tail);
                   1474: 	if (($filetype eq "hosts") || 
                   1475: 	    ($filetype eq "domain")) {
                   1476: 	    if($script ne "") {
                   1477: 		&Reply($client,              # BUGBUG - EditFile
                   1478: 		      &EditFile($userinput), #   could fail.
                   1479: 		      $userinput);
                   1480: 	    } else {
                   1481: 		&Failure($client,"refused\n",$userinput);
                   1482: 	    }
                   1483: 	} else {
                   1484: 	    &Failure($client,"refused\n",$userinput);
                   1485: 	}
                   1486:     } else {
                   1487: 	&Failure($client,"refused\n",$userinput);
                   1488:     }
                   1489:     return 1;
                   1490: }
1.263     albertel 1491: &register_handler("edit", \&edit_table_handler, 1, 0, 1);
1.218     foxr     1492: 
1.220     foxr     1493: #
                   1494: #   Authenticate a user against the LonCAPA authentication
                   1495: #   database.  Note that there are several authentication
                   1496: #   possibilities:
                   1497: #   - unix     - The user can be authenticated against the unix
                   1498: #                password file.
                   1499: #   - internal - The user can be authenticated against a purely 
                   1500: #                internal per user password file.
                   1501: #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
                   1502: #                ticket granting authority.
                   1503: #   - user     - The person tailoring LonCAPA can supply a user authentication
                   1504: #                mechanism that is per system.
                   1505: #
                   1506: # Parameters:
                   1507: #    $cmd      - The command that got us here.
                   1508: #    $tail     - Tail of the command (remaining parameters).
                   1509: #    $client   - File descriptor connected to client.
                   1510: # Returns
                   1511: #     0        - Requested to exit, caller should shut down.
                   1512: #     1        - Continue processing.
                   1513: # Implicit inputs:
                   1514: #    The authentication systems describe above have their own forms of implicit
                   1515: #    input into the authentication process that are described above.
                   1516: #
                   1517: sub authenticate_handler {
                   1518:     my ($cmd, $tail, $client) = @_;
                   1519: 
                   1520:     
                   1521:     #  Regenerate the full input line 
                   1522:     
                   1523:     my $userinput  = $cmd.":".$tail;
                   1524:     
                   1525:     #  udom    - User's domain.
                   1526:     #  uname   - Username.
                   1527:     #  upass   - User's password.
                   1528:     
                   1529:     my ($udom,$uname,$upass)=split(/:/,$tail);
                   1530:     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
                   1531:     chomp($upass);
                   1532:     $upass=&unescape($upass);
                   1533: 
                   1534:     my $pwdcorrect = &validate_user($udom, $uname, $upass);
                   1535:     if($pwdcorrect) {
                   1536: 	&Reply( $client, "authorized\n", $userinput);
                   1537: 	#
                   1538: 	#  Bad credentials: Failed to authorize
                   1539: 	#
                   1540:     } else {
                   1541: 	&Failure( $client, "non_authorized\n", $userinput);
                   1542:     }
                   1543: 
                   1544:     return 1;
                   1545: }
1.263     albertel 1546: &register_handler("auth", \&authenticate_handler, 1, 1, 0);
1.214     foxr     1547: 
1.222     foxr     1548: #
                   1549: #   Change a user's password.  Note that this function is complicated by
                   1550: #   the fact that a user may be authenticated in more than one way:
                   1551: #   At present, we are not able to change the password for all types of
                   1552: #   authentication methods.  Only for:
                   1553: #      unix    - unix password or shadow passoword style authentication.
                   1554: #      local   - Locally written authentication mechanism.
                   1555: #   For now, kerb4 and kerb5 password changes are not supported and result
                   1556: #   in an error.
                   1557: # FUTURE WORK:
                   1558: #    Support kerberos passwd changes?
                   1559: # Parameters:
                   1560: #    $cmd      - The command that got us here.
                   1561: #    $tail     - Tail of the command (remaining parameters).
                   1562: #    $client   - File descriptor connected to client.
                   1563: # Returns
                   1564: #     0        - Requested to exit, caller should shut down.
                   1565: #     1        - Continue processing.
                   1566: # Implicit inputs:
                   1567: #    The authentication systems describe above have their own forms of implicit
                   1568: #    input into the authentication process that are described above.
                   1569: sub change_password_handler {
                   1570:     my ($cmd, $tail, $client) = @_;
                   1571: 
                   1572:     my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
                   1573: 
                   1574:     #
                   1575:     #  udom  - user's domain.
                   1576:     #  uname - Username.
                   1577:     #  upass - Current password.
                   1578:     #  npass - New password.
                   1579:    
                   1580:     my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
                   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
                   1587:     # old password:
                   1588: 
                   1589:     my $validated = &validate_user($udom, $uname, $upass);
                   1590:     if($validated) {
                   1591: 	my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
                   1592: 	
                   1593: 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   1594: 	if ($howpwd eq 'internal') {
                   1595: 	    &Debug("internal auth");
                   1596: 	    my $salt=time;
                   1597: 	    $salt=substr($salt,6,2);
                   1598: 	    my $ncpass=crypt($npass,$salt);
                   1599: 	    if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
                   1600: 		&logthis("Result of password change for "
                   1601: 			 ."$uname: pwchange_success");
                   1602: 		&Reply($client, "ok\n", $userinput);
                   1603: 	    } else {
                   1604: 		&logthis("Unable to open $uname passwd "               
                   1605: 			 ."to change password");
                   1606: 		&Failure( $client, "non_authorized\n",$userinput);
                   1607: 	    }
                   1608: 	} elsif ($howpwd eq 'unix') {
1.287     foxr     1609: 	    my $result = &change_unix_password($uname, $npass);
1.222     foxr     1610: 	    &logthis("Result of password change for $uname: ".
1.287     foxr     1611: 		     $result);
1.222     foxr     1612: 	    &Reply($client, "$result\n", $userinput);
                   1613: 	} else {
                   1614: 	    # this just means that the current password mode is not
                   1615: 	    # one we know how to change (e.g the kerberos auth modes or
                   1616: 	    # locally written auth handler).
                   1617: 	    #
                   1618: 	    &Failure( $client, "auth_mode_error\n", $userinput);
                   1619: 	}  
                   1620: 	
1.224     foxr     1621:     } else {
1.222     foxr     1622: 	&Failure( $client, "non_authorized\n", $userinput);
                   1623:     }
                   1624: 
                   1625:     return 1;
                   1626: }
1.263     albertel 1627: &register_handler("passwd", \&change_password_handler, 1, 1, 0);
1.222     foxr     1628: 
1.225     foxr     1629: #
                   1630: #   Create a new user.  User in this case means a lon-capa user.
                   1631: #   The user must either already exist in some authentication realm
                   1632: #   like kerberos or the /etc/passwd.  If not, a user completely local to
                   1633: #   this loncapa system is created.
                   1634: #
                   1635: # Parameters:
                   1636: #    $cmd      - The command that got us here.
                   1637: #    $tail     - Tail of the command (remaining parameters).
                   1638: #    $client   - File descriptor connected to client.
                   1639: # Returns
                   1640: #     0        - Requested to exit, caller should shut down.
                   1641: #     1        - Continue processing.
                   1642: # Implicit inputs:
                   1643: #    The authentication systems describe above have their own forms of implicit
                   1644: #    input into the authentication process that are described above.
                   1645: sub add_user_handler {
                   1646: 
                   1647:     my ($cmd, $tail, $client) = @_;
                   1648: 
                   1649: 
                   1650:     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
                   1651:     my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
                   1652: 
                   1653:     &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
                   1654: 
                   1655: 
                   1656:     if($udom eq $currentdomainid) { # Reject new users for other domains...
                   1657: 	
                   1658: 	my $oldumask=umask(0077);
                   1659: 	chomp($npass);
                   1660: 	$npass=&unescape($npass);
                   1661: 	my $passfilename  = &password_path($udom, $uname);
                   1662: 	&Debug("Password file created will be:".$passfilename);
                   1663: 	if (-e $passfilename) {
                   1664: 	    &Failure( $client, "already_exists\n", $userinput);
                   1665: 	} else {
                   1666: 	    my $fperror='';
1.264     albertel 1667: 	    if (!&mkpath($passfilename)) {
                   1668: 		$fperror="error: ".($!+0)." mkdir failed while attempting "
                   1669: 		    ."makeuser";
1.225     foxr     1670: 	    }
                   1671: 	    unless ($fperror) {
                   1672: 		my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
                   1673: 		&Reply($client, $result, $userinput);     #BUGBUG - could be fail
                   1674: 	    } else {
                   1675: 		&Failure($client, "$fperror\n", $userinput);
                   1676: 	    }
                   1677: 	}
                   1678: 	umask($oldumask);
                   1679:     }  else {
                   1680: 	&Failure($client, "not_right_domain\n",
                   1681: 		$userinput);	# Even if we are multihomed.
                   1682:     
                   1683:     }
                   1684:     return 1;
                   1685: 
                   1686: }
                   1687: &register_handler("makeuser", \&add_user_handler, 1, 1, 0);
                   1688: 
                   1689: #
                   1690: #   Change the authentication method of a user.  Note that this may
                   1691: #   also implicitly change the user's password if, for example, the user is
                   1692: #   joining an existing authentication realm.  Known authentication realms at
                   1693: #   this time are:
                   1694: #    internal   - Purely internal password file (only loncapa knows this user)
                   1695: #    local      - Institutionally written authentication module.
                   1696: #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
                   1697: #    kerb4      - kerberos version 4
                   1698: #    kerb5      - kerberos version 5
                   1699: #
                   1700: # Parameters:
                   1701: #    $cmd      - The command that got us here.
                   1702: #    $tail     - Tail of the command (remaining parameters).
                   1703: #    $client   - File descriptor connected to client.
                   1704: # Returns
                   1705: #     0        - Requested to exit, caller should shut down.
                   1706: #     1        - Continue processing.
                   1707: # Implicit inputs:
                   1708: #    The authentication systems describe above have their own forms of implicit
                   1709: #    input into the authentication process that are described above.
1.287     foxr     1710: # NOTE:
                   1711: #   This is also used to change the authentication credential values (e.g. passwd).
                   1712: #   
1.225     foxr     1713: #
                   1714: sub change_authentication_handler {
                   1715: 
                   1716:     my ($cmd, $tail, $client) = @_;
                   1717:    
                   1718:     my $userinput  = "$cmd:$tail";              # Reconstruct user input.
                   1719: 
                   1720:     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
                   1721:     &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
                   1722:     if ($udom ne $currentdomainid) {
                   1723: 	&Failure( $client, "not_right_domain\n", $client);
                   1724:     } else {
                   1725: 	
                   1726: 	chomp($npass);
                   1727: 	
                   1728: 	$npass=&unescape($npass);
1.261     foxr     1729: 	my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
1.225     foxr     1730: 	my $passfilename = &password_path($udom, $uname);
                   1731: 	if ($passfilename) {	# Not allowed to create a new user!!
1.287     foxr     1732: 	    # If just changing the unix passwd. need to arrange to run
                   1733: 	    # passwd since otherwise make_passwd_file will run
                   1734: 	    # lcuseradd which fails if an account already exists
                   1735: 	    # (to prevent an unscrupulous LONCAPA admin from stealing
                   1736: 	    # an existing account by overwriting it as a LonCAPA account).
                   1737: 
                   1738: 	    if(($oldauth =~/^unix/) && ($umode eq "unix")) {
                   1739: 		my $result = &change_unix_password($uname, $npass);
                   1740: 		&logthis("Result of password change for $uname: ".$result);
                   1741: 		if ($result eq "ok") {
                   1742: 		    &Reply($client, "$result\n")
1.288     albertel 1743: 		} else {
1.287     foxr     1744: 		    &Failure($client, "$result\n");
                   1745: 		}
1.288     albertel 1746: 	    } else {
1.287     foxr     1747: 		my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
                   1748: 		#
                   1749: 		#  If the current auth mode is internal, and the old auth mode was
                   1750: 		#  unix, or krb*,  and the user is an author for this domain,
                   1751: 		#  re-run manage_permissions for that role in order to be able
                   1752: 		#  to take ownership of the construction space back to www:www
                   1753: 		#
                   1754: 		
                   1755: 		
                   1756: 		if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
                   1757: 		    (($oldauth =~ /^internal/) && ($umode eq "unix")) ) { 
                   1758: 		    if(&is_author($udom, $uname)) {
                   1759: 			&Debug(" Need to manage author permissions...");
                   1760: 			&manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
                   1761: 		    }
1.261     foxr     1762: 		}
1.287     foxr     1763: 		&Reply($client, $result, $userinput);
1.261     foxr     1764: 	    }
                   1765: 	       
                   1766: 
1.225     foxr     1767: 	} else {	       
1.251     foxr     1768: 	    &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
1.225     foxr     1769: 	}
                   1770:     }
                   1771:     return 1;
                   1772: }
                   1773: &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
                   1774: 
                   1775: #
                   1776: #   Determines if this is the home server for a user.  The home server
                   1777: #   for a user will have his/her lon-capa passwd file.  Therefore all we need
                   1778: #   to do is determine if this file exists.
                   1779: #
                   1780: # Parameters:
                   1781: #    $cmd      - The command that got us here.
                   1782: #    $tail     - Tail of the command (remaining parameters).
                   1783: #    $client   - File descriptor connected to client.
                   1784: # Returns
                   1785: #     0        - Requested to exit, caller should shut down.
                   1786: #     1        - Continue processing.
                   1787: # Implicit inputs:
                   1788: #    The authentication systems describe above have their own forms of implicit
                   1789: #    input into the authentication process that are described above.
                   1790: #
                   1791: sub is_home_handler {
                   1792:     my ($cmd, $tail, $client) = @_;
                   1793:    
                   1794:     my $userinput  = "$cmd:$tail";
                   1795:    
                   1796:     my ($udom,$uname)=split(/:/,$tail);
                   1797:     chomp($uname);
                   1798:     my $passfile = &password_filename($udom, $uname);
                   1799:     if($passfile) {
                   1800: 	&Reply( $client, "found\n", $userinput);
                   1801:     } else {
                   1802: 	&Failure($client, "not_found\n", $userinput);
                   1803:     }
                   1804:     return 1;
                   1805: }
                   1806: &register_handler("home", \&is_home_handler, 0,1,0);
                   1807: 
                   1808: #
                   1809: #   Process an update request for a resource?? I think what's going on here is
                   1810: #   that a resource has been modified that we hold a subscription to.
                   1811: #   If the resource is not local, then we must update, or at least invalidate our
                   1812: #   cached copy of the resource. 
                   1813: #   FUTURE WORK:
                   1814: #      I need to look at this logic carefully.  My druthers would be to follow
                   1815: #      typical caching logic, and simple invalidate the cache, drop any subscription
                   1816: #      an let the next fetch start the ball rolling again... however that may
                   1817: #      actually be more difficult than it looks given the complex web of
                   1818: #      proxy servers.
                   1819: # Parameters:
                   1820: #    $cmd      - The command that got us here.
                   1821: #    $tail     - Tail of the command (remaining parameters).
                   1822: #    $client   - File descriptor connected to client.
                   1823: # Returns
                   1824: #     0        - Requested to exit, caller should shut down.
                   1825: #     1        - Continue processing.
                   1826: # Implicit inputs:
                   1827: #    The authentication systems describe above have their own forms of implicit
                   1828: #    input into the authentication process that are described above.
                   1829: #
                   1830: sub update_resource_handler {
                   1831: 
                   1832:     my ($cmd, $tail, $client) = @_;
                   1833:    
                   1834:     my $userinput = "$cmd:$tail";
                   1835:    
                   1836:     my $fname= $tail;		# This allows interactive testing
                   1837: 
                   1838: 
                   1839:     my $ownership=ishome($fname);
                   1840:     if ($ownership eq 'not_owner') {
                   1841: 	if (-e $fname) {
                   1842: 	    my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
                   1843: 		$atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
                   1844: 	    my $now=time;
                   1845: 	    my $since=$now-$atime;
                   1846: 	    if ($since>$perlvar{'lonExpire'}) {
                   1847: 		my $reply=&reply("unsub:$fname","$clientname");
1.308     albertel 1848: 		&devalidate_meta_cache($fname);
1.225     foxr     1849: 		unlink("$fname");
1.334   ! albertel 1850: 		unlink("$fname.meta");
1.225     foxr     1851: 	    } else {
                   1852: 		my $transname="$fname.in.transfer";
                   1853: 		my $remoteurl=&reply("sub:$fname","$clientname");
                   1854: 		my $response;
                   1855: 		alarm(120);
                   1856: 		{
                   1857: 		    my $ua=new LWP::UserAgent;
                   1858: 		    my $request=new HTTP::Request('GET',"$remoteurl");
                   1859: 		    $response=$ua->request($request,$transname);
                   1860: 		}
                   1861: 		alarm(0);
                   1862: 		if ($response->is_error()) {
                   1863: 		    unlink($transname);
                   1864: 		    my $message=$response->status_line;
                   1865: 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
                   1866: 		} else {
                   1867: 		    if ($remoteurl!~/\.meta$/) {
                   1868: 			alarm(120);
                   1869: 			{
                   1870: 			    my $ua=new LWP::UserAgent;
                   1871: 			    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
                   1872: 			    my $mresponse=$ua->request($mrequest,$fname.'.meta');
                   1873: 			    if ($mresponse->is_error()) {
                   1874: 				unlink($fname.'.meta');
                   1875: 			    }
                   1876: 			}
                   1877: 			alarm(0);
                   1878: 		    }
                   1879: 		    rename($transname,$fname);
1.308     albertel 1880: 		    &devalidate_meta_cache($fname);
1.225     foxr     1881: 		}
                   1882: 	    }
                   1883: 	    &Reply( $client, "ok\n", $userinput);
                   1884: 	} else {
                   1885: 	    &Failure($client, "not_found\n", $userinput);
                   1886: 	}
                   1887:     } else {
                   1888: 	&Failure($client, "rejected\n", $userinput);
                   1889:     }
                   1890:     return 1;
                   1891: }
                   1892: &register_handler("update", \&update_resource_handler, 0 ,1, 0);
                   1893: 
1.308     albertel 1894: sub devalidate_meta_cache {
                   1895:     my ($url) = @_;
                   1896:     use Cache::Memcached;
                   1897:     my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
                   1898:     $url = &declutter($url);
                   1899:     $url =~ s-\.meta$--;
                   1900:     my $id = &escape('meta:'.$url);
                   1901:     $memcache->delete($id);
                   1902: }
                   1903: 
                   1904: sub declutter {
                   1905:     my $thisfn=shift;
                   1906:     $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
                   1907:     $thisfn=~s/^\///;
                   1908:     $thisfn=~s|^adm/wrapper/||;
                   1909:     $thisfn=~s|^adm/coursedocs/showdoc/||;
                   1910:     $thisfn=~s/^res\///;
                   1911:     $thisfn=~s/\?.+$//;
                   1912:     return $thisfn;
                   1913: }
1.225     foxr     1914: #
1.226     foxr     1915: #   Fetch a user file from a remote server to the user's home directory
                   1916: #   userfiles subdir.
1.225     foxr     1917: # Parameters:
                   1918: #    $cmd      - The command that got us here.
                   1919: #    $tail     - Tail of the command (remaining parameters).
                   1920: #    $client   - File descriptor connected to client.
                   1921: # Returns
                   1922: #     0        - Requested to exit, caller should shut down.
                   1923: #     1        - Continue processing.
                   1924: #
                   1925: sub fetch_user_file_handler {
                   1926: 
                   1927:     my ($cmd, $tail, $client) = @_;
                   1928: 
                   1929:     my $userinput = "$cmd:$tail";
                   1930:     my $fname           = $tail;
1.232     foxr     1931:     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
1.225     foxr     1932:     my $udir=&propath($udom,$uname).'/userfiles';
                   1933:     unless (-e $udir) {
                   1934: 	mkdir($udir,0770); 
                   1935:     }
1.232     foxr     1936:     Debug("fetch user file for $fname");
1.225     foxr     1937:     if (-e $udir) {
                   1938: 	$ufile=~s/^[\.\~]+//;
1.232     foxr     1939: 
                   1940: 	# IF necessary, create the path right down to the file.
                   1941: 	# Note that any regular files in the way of this path are
                   1942: 	# wiped out to deal with some earlier folly of mine.
                   1943: 
1.267     raeburn  1944: 	if (!&mkpath($udir.'/'.$ufile)) {
1.264     albertel 1945: 	    &Failure($client, "unable_to_create\n", $userinput);	    
1.232     foxr     1946: 	}
                   1947: 
1.225     foxr     1948: 	my $destname=$udir.'/'.$ufile;
                   1949: 	my $transname=$udir.'/'.$ufile.'.in.transit';
                   1950: 	my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
                   1951: 	my $response;
1.232     foxr     1952: 	Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
1.225     foxr     1953: 	alarm(120);
                   1954: 	{
                   1955: 	    my $ua=new LWP::UserAgent;
                   1956: 	    my $request=new HTTP::Request('GET',"$remoteurl");
                   1957: 	    $response=$ua->request($request,$transname);
                   1958: 	}
                   1959: 	alarm(0);
                   1960: 	if ($response->is_error()) {
                   1961: 	    unlink($transname);
                   1962: 	    my $message=$response->status_line;
                   1963: 	    &logthis("LWP GET: $message for $fname ($remoteurl)");
                   1964: 	    &Failure($client, "failed\n", $userinput);
                   1965: 	} else {
1.232     foxr     1966: 	    Debug("Renaming $transname to $destname");
1.225     foxr     1967: 	    if (!rename($transname,$destname)) {
                   1968: 		&logthis("Unable to move $transname to $destname");
                   1969: 		unlink($transname);
                   1970: 		&Failure($client, "failed\n", $userinput);
                   1971: 	    } else {
                   1972: 		&Reply($client, "ok\n", $userinput);
                   1973: 	    }
                   1974: 	}   
                   1975:     } else {
                   1976: 	&Failure($client, "not_home\n", $userinput);
                   1977:     }
                   1978:     return 1;
                   1979: }
                   1980: &register_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
                   1981: 
1.226     foxr     1982: #
                   1983: #   Remove a file from a user's home directory userfiles subdirectory.
                   1984: # Parameters:
                   1985: #    cmd   - the Lond request keyword that got us here.
                   1986: #    tail  - the part of the command past the keyword.
                   1987: #    client- File descriptor connected with the client.
                   1988: #
                   1989: # Returns:
                   1990: #    1    - Continue processing.
                   1991: sub remove_user_file_handler {
                   1992:     my ($cmd, $tail, $client) = @_;
                   1993: 
                   1994:     my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
                   1995: 
                   1996:     my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
                   1997:     if ($ufile =~m|/\.\./|) {
                   1998: 	# any files paths with /../ in them refuse 
                   1999: 	# to deal with
                   2000: 	&Failure($client, "refused\n", "$cmd:$tail");
                   2001:     } else {
                   2002: 	my $udir = &propath($udom,$uname);
                   2003: 	if (-e $udir) {
                   2004: 	    my $file=$udir.'/userfiles/'.$ufile;
                   2005: 	    if (-e $file) {
1.253     foxr     2006: 		#
                   2007: 		#   If the file is a regular file unlink is fine...
                   2008: 		#   However it's possible the client wants a dir.
                   2009: 		#   removed, in which case rmdir is more approprate:
                   2010: 		#
1.240     banghart 2011: 	        if (-f $file){
1.241     albertel 2012: 		    unlink($file);
                   2013: 		} elsif(-d $file) {
                   2014: 		    rmdir($file);
1.240     banghart 2015: 		}
1.226     foxr     2016: 		if (-e $file) {
1.253     foxr     2017: 		    #  File is still there after we deleted it ?!?
                   2018: 
1.226     foxr     2019: 		    &Failure($client, "failed\n", "$cmd:$tail");
                   2020: 		} else {
                   2021: 		    &Reply($client, "ok\n", "$cmd:$tail");
                   2022: 		}
                   2023: 	    } else {
                   2024: 		&Failure($client, "not_found\n", "$cmd:$tail");
                   2025: 	    }
                   2026: 	} else {
                   2027: 	    &Failure($client, "not_home\n", "$cmd:$tail");
                   2028: 	}
                   2029:     }
                   2030:     return 1;
                   2031: }
                   2032: &register_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
                   2033: 
1.236     albertel 2034: #
                   2035: #   make a directory in a user's home directory userfiles subdirectory.
                   2036: # Parameters:
                   2037: #    cmd   - the Lond request keyword that got us here.
                   2038: #    tail  - the part of the command past the keyword.
                   2039: #    client- File descriptor connected with the client.
                   2040: #
                   2041: # Returns:
                   2042: #    1    - Continue processing.
                   2043: sub mkdir_user_file_handler {
                   2044:     my ($cmd, $tail, $client) = @_;
                   2045: 
                   2046:     my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
                   2047:     $dir=&unescape($dir);
                   2048:     my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
                   2049:     if ($ufile =~m|/\.\./|) {
                   2050: 	# any files paths with /../ in them refuse 
                   2051: 	# to deal with
                   2052: 	&Failure($client, "refused\n", "$cmd:$tail");
                   2053:     } else {
                   2054: 	my $udir = &propath($udom,$uname);
                   2055: 	if (-e $udir) {
1.264     albertel 2056: 	    my $newdir=$udir.'/userfiles/'.$ufile.'/';
                   2057: 	    if (!&mkpath($newdir)) {
                   2058: 		&Failure($client, "failed\n", "$cmd:$tail");
1.236     albertel 2059: 	    }
1.264     albertel 2060: 	    &Reply($client, "ok\n", "$cmd:$tail");
1.236     albertel 2061: 	} else {
                   2062: 	    &Failure($client, "not_home\n", "$cmd:$tail");
                   2063: 	}
                   2064:     }
                   2065:     return 1;
                   2066: }
                   2067: &register_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
                   2068: 
1.237     albertel 2069: #
                   2070: #   rename a file in a user's home directory userfiles subdirectory.
                   2071: # Parameters:
                   2072: #    cmd   - the Lond request keyword that got us here.
                   2073: #    tail  - the part of the command past the keyword.
                   2074: #    client- File descriptor connected with the client.
                   2075: #
                   2076: # Returns:
                   2077: #    1    - Continue processing.
                   2078: sub rename_user_file_handler {
                   2079:     my ($cmd, $tail, $client) = @_;
                   2080: 
                   2081:     my ($udom,$uname,$old,$new) = split(/:/, $tail);
                   2082:     $old=&unescape($old);
                   2083:     $new=&unescape($new);
                   2084:     if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
                   2085: 	# any files paths with /../ in them refuse to deal with
                   2086: 	&Failure($client, "refused\n", "$cmd:$tail");
                   2087:     } else {
                   2088: 	my $udir = &propath($udom,$uname);
                   2089: 	if (-e $udir) {
                   2090: 	    my $oldfile=$udir.'/userfiles/'.$old;
                   2091: 	    my $newfile=$udir.'/userfiles/'.$new;
                   2092: 	    if (-e $newfile) {
                   2093: 		&Failure($client, "exists\n", "$cmd:$tail");
                   2094: 	    } elsif (! -e $oldfile) {
                   2095: 		&Failure($client, "not_found\n", "$cmd:$tail");
                   2096: 	    } else {
                   2097: 		if (!rename($oldfile,$newfile)) {
                   2098: 		    &Failure($client, "failed\n", "$cmd:$tail");
                   2099: 		} else {
                   2100: 		    &Reply($client, "ok\n", "$cmd:$tail");
                   2101: 		}
                   2102: 	    }
                   2103: 	} else {
                   2104: 	    &Failure($client, "not_home\n", "$cmd:$tail");
                   2105: 	}
                   2106:     }
                   2107:     return 1;
                   2108: }
                   2109: &register_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
                   2110: 
1.227     foxr     2111: #
1.263     albertel 2112: #  Authenticate access to a user file by checking that the token the user's 
                   2113: #  passed also exists in their session file
1.227     foxr     2114: #
                   2115: # Parameters:
                   2116: #   cmd      - The request keyword that dispatched to tus.
                   2117: #   tail     - The tail of the request (colon separated parameters).
                   2118: #   client   - Filehandle open on the client.
                   2119: # Return:
                   2120: #    1.
                   2121: sub token_auth_user_file_handler {
                   2122:     my ($cmd, $tail, $client) = @_;
                   2123: 
                   2124:     my ($fname, $session) = split(/:/, $tail);
                   2125:     
                   2126:     chomp($session);
1.251     foxr     2127:     my $reply="non_auth\n";
1.227     foxr     2128:     if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
                   2129: 	     $session.'.id')) {
1.332     albertel 2130: 	flock(ENVIN,LOCK_SH);
1.227     foxr     2131: 	while (my $line=<ENVIN>) {
1.330     albertel 2132: 	    my ($envname)=split(/=/,$line,2);
                   2133: 	    $envname=&unescape($envname);
                   2134: 	    if ($envname=~ m|^userfile\.\Q$fname\E|) { $reply="ok\n"; }
1.227     foxr     2135: 	}
                   2136: 	close(ENVIN);
1.251     foxr     2137: 	&Reply($client, $reply, "$cmd:$tail");
1.227     foxr     2138:     } else {
                   2139: 	&Failure($client, "invalid_token\n", "$cmd:$tail");
                   2140:     }
                   2141:     return 1;
                   2142: 
                   2143: }
                   2144: &register_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
1.229     foxr     2145: 
                   2146: #
                   2147: #   Unsubscribe from a resource.
                   2148: #
                   2149: # Parameters:
                   2150: #    $cmd      - The command that got us here.
                   2151: #    $tail     - Tail of the command (remaining parameters).
                   2152: #    $client   - File descriptor connected to client.
                   2153: # Returns
                   2154: #     0        - Requested to exit, caller should shut down.
                   2155: #     1        - Continue processing.
                   2156: #
                   2157: sub unsubscribe_handler {
                   2158:     my ($cmd, $tail, $client) = @_;
                   2159: 
                   2160:     my $userinput= "$cmd:$tail";
                   2161:     
                   2162:     my ($fname) = split(/:/,$tail); # Split in case there's extrs.
                   2163: 
                   2164:     &Debug("Unsubscribing $fname");
                   2165:     if (-e $fname) {
                   2166: 	&Debug("Exists");
                   2167: 	&Reply($client, &unsub($fname,$clientip), $userinput);
                   2168:     } else {
                   2169: 	&Failure($client, "not_found\n", $userinput);
                   2170:     }
                   2171:     return 1;
                   2172: }
                   2173: &register_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
1.263     albertel 2174: 
1.230     foxr     2175: #   Subscribe to a resource
                   2176: #
                   2177: # Parameters:
                   2178: #    $cmd      - The command that got us here.
                   2179: #    $tail     - Tail of the command (remaining parameters).
                   2180: #    $client   - File descriptor connected to client.
                   2181: # Returns
                   2182: #     0        - Requested to exit, caller should shut down.
                   2183: #     1        - Continue processing.
                   2184: #
                   2185: sub subscribe_handler {
                   2186:     my ($cmd, $tail, $client)= @_;
                   2187: 
                   2188:     my $userinput  = "$cmd:$tail";
                   2189: 
                   2190:     &Reply( $client, &subscribe($userinput,$clientip), $userinput);
                   2191: 
                   2192:     return 1;
                   2193: }
                   2194: &register_handler("sub", \&subscribe_handler, 0, 1, 0);
                   2195: 
                   2196: #
                   2197: #   Determine the version of a resource (?) Or is it return
                   2198: #   the top version of the resource?  Not yet clear from the
                   2199: #   code in currentversion.
                   2200: #
                   2201: # Parameters:
                   2202: #    $cmd      - The command that got us here.
                   2203: #    $tail     - Tail of the command (remaining parameters).
                   2204: #    $client   - File descriptor connected to client.
                   2205: # Returns
                   2206: #     0        - Requested to exit, caller should shut down.
                   2207: #     1        - Continue processing.
                   2208: #
                   2209: sub current_version_handler {
                   2210:     my ($cmd, $tail, $client) = @_;
                   2211: 
                   2212:     my $userinput= "$cmd:$tail";
                   2213:    
                   2214:     my $fname   = $tail;
                   2215:     &Reply( $client, &currentversion($fname)."\n", $userinput);
                   2216:     return 1;
                   2217: 
                   2218: }
                   2219: &register_handler("currentversion", \&current_version_handler, 0, 1, 0);
                   2220: 
                   2221: #  Make an entry in a user's activity log.
                   2222: #
                   2223: # Parameters:
                   2224: #    $cmd      - The command that got us here.
                   2225: #    $tail     - Tail of the command (remaining parameters).
                   2226: #    $client   - File descriptor connected to client.
                   2227: # Returns
                   2228: #     0        - Requested to exit, caller should shut down.
                   2229: #     1        - Continue processing.
                   2230: #
                   2231: sub activity_log_handler {
                   2232:     my ($cmd, $tail, $client) = @_;
                   2233: 
                   2234: 
                   2235:     my $userinput= "$cmd:$tail";
                   2236: 
                   2237:     my ($udom,$uname,$what)=split(/:/,$tail);
                   2238:     chomp($what);
                   2239:     my $proname=&propath($udom,$uname);
                   2240:     my $now=time;
                   2241:     my $hfh;
                   2242:     if ($hfh=IO::File->new(">>$proname/activity.log")) { 
                   2243: 	print $hfh "$now:$clientname:$what\n";
                   2244: 	&Reply( $client, "ok\n", $userinput); 
                   2245:     } else {
                   2246: 	&Failure($client, "error: ".($!+0)." IO::File->new Failed "
                   2247: 		 ."while attempting log\n", 
                   2248: 		 $userinput);
                   2249:     }
                   2250: 
                   2251:     return 1;
                   2252: }
1.263     albertel 2253: &register_handler("log", \&activity_log_handler, 0, 1, 0);
1.230     foxr     2254: 
                   2255: #
                   2256: #   Put a namespace entry in a user profile hash.
                   2257: #   My druthers would be for this to be an encrypted interaction too.
                   2258: #   anything that might be an inadvertent covert channel about either
                   2259: #   user authentication or user personal information....
                   2260: #
                   2261: # Parameters:
                   2262: #    $cmd      - The command that got us here.
                   2263: #    $tail     - Tail of the command (remaining parameters).
                   2264: #    $client   - File descriptor connected to client.
                   2265: # Returns
                   2266: #     0        - Requested to exit, caller should shut down.
                   2267: #     1        - Continue processing.
                   2268: #
                   2269: sub put_user_profile_entry {
                   2270:     my ($cmd, $tail, $client)  = @_;
1.229     foxr     2271: 
1.230     foxr     2272:     my $userinput = "$cmd:$tail";
                   2273:     
1.242     raeburn  2274:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
1.230     foxr     2275:     if ($namespace ne 'roles') {
                   2276: 	chomp($what);
                   2277: 	my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2278: 				  &GDBM_WRCREAT(),"P",$what);
                   2279: 	if($hashref) {
                   2280: 	    my @pairs=split(/\&/,$what);
                   2281: 	    foreach my $pair (@pairs) {
                   2282: 		my ($key,$value)=split(/=/,$pair);
                   2283: 		$hashref->{$key}=$value;
                   2284: 	    }
1.311     albertel 2285: 	    if (&untie_user_hash($hashref)) {
1.230     foxr     2286: 		&Reply( $client, "ok\n", $userinput);
                   2287: 	    } else {
                   2288: 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                   2289: 			"while attempting put\n", 
                   2290: 			$userinput);
                   2291: 	    }
                   2292: 	} else {
1.316     albertel 2293: 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1.230     foxr     2294: 		     "while attempting put\n", $userinput);
                   2295: 	}
                   2296:     } else {
                   2297:         &Failure( $client, "refused\n", $userinput);
                   2298:     }
                   2299:     
                   2300:     return 1;
                   2301: }
                   2302: &register_handler("put", \&put_user_profile_entry, 0, 1, 0);
                   2303: 
1.283     albertel 2304: #   Put a piece of new data in hash, returns error if entry already exists
                   2305: # Parameters:
                   2306: #    $cmd      - The command that got us here.
                   2307: #    $tail     - Tail of the command (remaining parameters).
                   2308: #    $client   - File descriptor connected to client.
                   2309: # Returns
                   2310: #     0        - Requested to exit, caller should shut down.
                   2311: #     1        - Continue processing.
                   2312: #
                   2313: sub newput_user_profile_entry {
                   2314:     my ($cmd, $tail, $client)  = @_;
                   2315: 
                   2316:     my $userinput = "$cmd:$tail";
                   2317: 
                   2318:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
                   2319:     if ($namespace eq 'roles') {
                   2320:         &Failure( $client, "refused\n", $userinput);
                   2321: 	return 1;
                   2322:     }
                   2323: 
                   2324:     chomp($what);
                   2325: 
                   2326:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2327: 				 &GDBM_WRCREAT(),"N",$what);
                   2328:     if(!$hashref) {
1.316     albertel 2329: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1.283     albertel 2330: 		  "while attempting put\n", $userinput);
                   2331: 	return 1;
                   2332:     }
                   2333: 
                   2334:     my @pairs=split(/\&/,$what);
                   2335:     foreach my $pair (@pairs) {
                   2336: 	my ($key,$value)=split(/=/,$pair);
                   2337: 	if (exists($hashref->{$key})) {
                   2338: 	    &Failure($client, "key_exists: ".$key."\n",$userinput);
                   2339: 	    return 1;
                   2340: 	}
                   2341:     }
                   2342: 
                   2343:     foreach my $pair (@pairs) {
                   2344: 	my ($key,$value)=split(/=/,$pair);
                   2345: 	$hashref->{$key}=$value;
                   2346:     }
                   2347: 
1.311     albertel 2348:     if (&untie_user_hash($hashref)) {
1.283     albertel 2349: 	&Reply( $client, "ok\n", $userinput);
                   2350:     } else {
                   2351: 	&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                   2352: 		 "while attempting put\n", 
                   2353: 		 $userinput);
                   2354:     }
                   2355:     return 1;
                   2356: }
                   2357: &register_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
                   2358: 
1.230     foxr     2359: # 
                   2360: #   Increment a profile entry in the user history file.
                   2361: #   The history contains keyword value pairs.  In this case,
                   2362: #   The value itself is a pair of numbers.  The first, the current value
                   2363: #   the second an increment that this function applies to the current
                   2364: #   value.
                   2365: #
                   2366: # Parameters:
                   2367: #    $cmd      - The command that got us here.
                   2368: #    $tail     - Tail of the command (remaining parameters).
                   2369: #    $client   - File descriptor connected to client.
                   2370: # Returns
                   2371: #     0        - Requested to exit, caller should shut down.
                   2372: #     1        - Continue processing.
                   2373: #
                   2374: sub increment_user_value_handler {
                   2375:     my ($cmd, $tail, $client) = @_;
                   2376:     
                   2377:     my $userinput   = "$cmd:$tail";
                   2378:     
                   2379:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
                   2380:     if ($namespace ne 'roles') {
                   2381:         chomp($what);
                   2382: 	my $hashref = &tie_user_hash($udom, $uname,
                   2383: 				     $namespace, &GDBM_WRCREAT(),
                   2384: 				     "P",$what);
                   2385: 	if ($hashref) {
                   2386: 	    my @pairs=split(/\&/,$what);
                   2387: 	    foreach my $pair (@pairs) {
                   2388: 		my ($key,$value)=split(/=/,$pair);
1.284     raeburn  2389:                 $value = &unescape($value);
1.230     foxr     2390: 		# We could check that we have a number...
                   2391: 		if (! defined($value) || $value eq '') {
                   2392: 		    $value = 1;
                   2393: 		}
                   2394: 		$hashref->{$key}+=$value;
1.284     raeburn  2395:                 if ($namespace eq 'nohist_resourcetracker') {
                   2396:                     if ($hashref->{$key} < 0) {
                   2397:                         $hashref->{$key} = 0;
                   2398:                     }
                   2399:                 }
1.230     foxr     2400: 	    }
1.311     albertel 2401: 	    if (&untie_user_hash($hashref)) {
1.230     foxr     2402: 		&Reply( $client, "ok\n", $userinput);
                   2403: 	    } else {
                   2404: 		&Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
                   2405: 			 "while attempting inc\n", $userinput);
                   2406: 	    }
                   2407: 	} else {
                   2408: 	    &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2409: 		     "while attempting inc\n", $userinput);
                   2410: 	}
                   2411:     } else {
                   2412: 	&Failure($client, "refused\n", $userinput);
                   2413:     }
                   2414:     
                   2415:     return 1;
                   2416: }
                   2417: &register_handler("inc", \&increment_user_value_handler, 0, 1, 0);
                   2418: 
                   2419: #
                   2420: #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
                   2421: #   Each 'role' a user has implies a set of permissions.  Adding a new role
                   2422: #   for a person grants the permissions packaged with that role
                   2423: #   to that user when the role is selected.
                   2424: #
                   2425: # Parameters:
                   2426: #    $cmd       - The command string (rolesput).
                   2427: #    $tail      - The remainder of the request line.  For rolesput this
                   2428: #                 consists of a colon separated list that contains:
                   2429: #                 The domain and user that is granting the role (logged).
                   2430: #                 The domain and user that is getting the role.
                   2431: #                 The roles being granted as a set of & separated pairs.
                   2432: #                 each pair a key value pair.
                   2433: #    $client    - File descriptor connected to the client.
                   2434: # Returns:
                   2435: #     0         - If the daemon should exit
                   2436: #     1         - To continue processing.
                   2437: #
                   2438: #
                   2439: sub roles_put_handler {
                   2440:     my ($cmd, $tail, $client) = @_;
                   2441: 
                   2442:     my $userinput  = "$cmd:$tail";
                   2443: 
                   2444:     my ( $exedom, $exeuser, $udom, $uname,  $what) = split(/:/,$tail);
                   2445:     
                   2446: 
                   2447:     my $namespace='roles';
                   2448:     chomp($what);
                   2449:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2450: 				 &GDBM_WRCREAT(), "P",
                   2451: 				 "$exedom:$exeuser:$what");
                   2452:     #
                   2453:     #  Log the attempt to set a role.  The {}'s here ensure that the file 
                   2454:     #  handle is open for the minimal amount of time.  Since the flush
                   2455:     #  is done on close this improves the chances the log will be an un-
                   2456:     #  corrupted ordered thing.
                   2457:     if ($hashref) {
1.261     foxr     2458: 	my $pass_entry = &get_auth_type($udom, $uname);
                   2459: 	my ($auth_type,$pwd)  = split(/:/, $pass_entry);
                   2460: 	$auth_type = $auth_type.":";
1.230     foxr     2461: 	my @pairs=split(/\&/,$what);
                   2462: 	foreach my $pair (@pairs) {
                   2463: 	    my ($key,$value)=split(/=/,$pair);
                   2464: 	    &manage_permissions($key, $udom, $uname,
1.260     foxr     2465: 			       $auth_type);
1.230     foxr     2466: 	    $hashref->{$key}=$value;
                   2467: 	}
1.311     albertel 2468: 	if (&untie_user_hash($hashref)) {
1.230     foxr     2469: 	    &Reply($client, "ok\n", $userinput);
                   2470: 	} else {
                   2471: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2472: 		     "while attempting rolesput\n", $userinput);
                   2473: 	}
                   2474:     } else {
                   2475: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2476: 		 "while attempting rolesput\n", $userinput);
                   2477:     }
                   2478:     return 1;
                   2479: }
                   2480: &register_handler("rolesput", \&roles_put_handler, 1,1,0);  # Encoded client only.
                   2481: 
                   2482: #
1.231     foxr     2483: #   Deletes (removes) a role for a user.   This is equivalent to removing
                   2484: #  a permissions package associated with the role from the user's profile.
                   2485: #
                   2486: # Parameters:
                   2487: #     $cmd                 - The command (rolesdel)
                   2488: #     $tail                - The remainder of the request line. This consists
                   2489: #                             of:
                   2490: #                             The domain and user requesting the change (logged)
                   2491: #                             The domain and user being changed.
                   2492: #                             The roles being revoked.  These are shipped to us
                   2493: #                             as a bunch of & separated role name keywords.
                   2494: #     $client              - The file handle open on the client.
                   2495: # Returns:
                   2496: #     1                    - Continue processing
                   2497: #     0                    - Exit.
                   2498: #
                   2499: sub roles_delete_handler {
                   2500:     my ($cmd, $tail, $client)  = @_;
                   2501: 
                   2502:     my $userinput    = "$cmd:$tail";
                   2503:    
                   2504:     my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
                   2505:     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
                   2506: 	   "what = ".$what);
                   2507:     my $namespace='roles';
                   2508:     chomp($what);
                   2509:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2510: 				 &GDBM_WRCREAT(), "D",
                   2511: 				 "$exedom:$exeuser:$what");
                   2512:     
                   2513:     if ($hashref) {
                   2514: 	my @rolekeys=split(/\&/,$what);
                   2515: 	
                   2516: 	foreach my $key (@rolekeys) {
                   2517: 	    delete $hashref->{$key};
                   2518: 	}
1.315     albertel 2519: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2520: 	    &Reply($client, "ok\n", $userinput);
                   2521: 	} else {
                   2522: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2523: 		     "while attempting rolesdel\n", $userinput);
                   2524: 	}
                   2525:     } else {
                   2526:         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2527: 		 "while attempting rolesdel\n", $userinput);
                   2528:     }
                   2529:     
                   2530:     return 1;
                   2531: }
                   2532: &register_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
                   2533: 
                   2534: # Unencrypted get from a user's profile database.  See 
                   2535: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
                   2536: # This function retrieves a keyed item from a specific named database in the
                   2537: # user's directory.
                   2538: #
                   2539: # Parameters:
                   2540: #   $cmd             - Command request keyword (get).
                   2541: #   $tail            - Tail of the command.  This is a colon separated list
                   2542: #                      consisting of the domain and username that uniquely
                   2543: #                      identifies the profile,
                   2544: #                      The 'namespace' which selects the gdbm file to 
                   2545: #                      do the lookup in, 
                   2546: #                      & separated list of keys to lookup.  Note that
                   2547: #                      the values are returned as an & separated list too.
                   2548: #   $client          - File descriptor open on the client.
                   2549: # Returns:
                   2550: #   1       - Continue processing.
                   2551: #   0       - Exit.
                   2552: #
                   2553: sub get_profile_entry {
                   2554:     my ($cmd, $tail, $client) = @_;
                   2555: 
                   2556:     my $userinput= "$cmd:$tail";
                   2557:    
                   2558:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
                   2559:     chomp($what);
1.255     foxr     2560: 
                   2561:     my $replystring = read_profile($udom, $uname, $namespace, $what);
                   2562:     my ($first) = split(/:/,$replystring);
                   2563:     if($first ne "error") {
                   2564: 	&Reply($client, "$replystring\n", $userinput);
1.231     foxr     2565:     } else {
1.255     foxr     2566: 	&Failure($client, $replystring." while attempting get\n", $userinput);
1.231     foxr     2567:     }
                   2568:     return 1;
1.255     foxr     2569: 
                   2570: 
1.231     foxr     2571: }
                   2572: &register_handler("get", \&get_profile_entry, 0,1,0);
                   2573: 
                   2574: #
                   2575: #  Process the encrypted get request.  Note that the request is sent
                   2576: #  in clear, but the reply is encrypted.  This is a small covert channel:
                   2577: #  information about the sensitive keys is given to the snooper.  Just not
                   2578: #  information about the values of the sensitive key.  Hmm if I wanted to
                   2579: #  know these I'd snoop for the egets. Get the profile item names from them
                   2580: #  and then issue a get for them since there's no enforcement of the
                   2581: #  requirement of an encrypted get for particular profile items.  If I
                   2582: #  were re-doing this, I'd force the request to be encrypted as well as the
                   2583: #  reply.  I'd also just enforce encrypted transactions for all gets since
                   2584: #  that would prevent any covert channel snooping.
                   2585: #
                   2586: #  Parameters:
                   2587: #     $cmd               - Command keyword of request (eget).
                   2588: #     $tail              - Tail of the command.  See GetProfileEntry
#                          for more information about this.
                   2589: #     $client            - File open on the client.
                   2590: #  Returns:
                   2591: #     1      - Continue processing
                   2592: #     0      - server should exit.
                   2593: sub get_profile_entry_encrypted {
                   2594:     my ($cmd, $tail, $client) = @_;
                   2595: 
                   2596:     my $userinput = "$cmd:$tail";
                   2597:    
                   2598:     my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
                   2599:     chomp($what);
1.255     foxr     2600:     my $qresult = read_profile($udom, $uname, $namespace, $what);
                   2601:     my ($first) = split(/:/, $qresult);
                   2602:     if($first ne "error") {
                   2603: 	
                   2604: 	if ($cipher) {
                   2605: 	    my $cmdlength=length($qresult);
                   2606: 	    $qresult.="         ";
                   2607: 	    my $encqresult='';
                   2608: 	    for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
                   2609: 		$encqresult.= unpack("H16", 
                   2610: 				     $cipher->encrypt(substr($qresult,
                   2611: 							     $encidx,
                   2612: 							     8)));
                   2613: 	    }
                   2614: 	    &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
                   2615: 	} else {
1.231     foxr     2616: 		&Failure( $client, "error:no_key\n", $userinput);
                   2617: 	    }
                   2618:     } else {
1.255     foxr     2619: 	&Failure($client, "$qresult while attempting eget\n", $userinput);
                   2620: 
1.231     foxr     2621:     }
                   2622:     
                   2623:     return 1;
                   2624: }
1.255     foxr     2625: &register_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
1.263     albertel 2626: 
1.231     foxr     2627: #
                   2628: #   Deletes a key in a user profile database.
                   2629: #   
                   2630: #   Parameters:
                   2631: #       $cmd                  - Command keyword (del).
                   2632: #       $tail                 - Command tail.  IN this case a colon
                   2633: #                               separated list containing:
                   2634: #                               The domain and user that identifies uniquely
                   2635: #                               the identity of the user.
                   2636: #                               The profile namespace (name of the profile
                   2637: #                               database file).
                   2638: #                               & separated list of keywords to delete.
                   2639: #       $client              - File open on client socket.
                   2640: # Returns:
                   2641: #     1   - Continue processing
                   2642: #     0   - Exit server.
                   2643: #
                   2644: #
                   2645: sub delete_profile_entry {
                   2646:     my ($cmd, $tail, $client) = @_;
                   2647: 
                   2648:     my $userinput = "cmd:$tail";
                   2649: 
                   2650:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
                   2651:     chomp($what);
                   2652:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2653: 				 &GDBM_WRCREAT(),
                   2654: 				 "D",$what);
                   2655:     if ($hashref) {
                   2656:         my @keys=split(/\&/,$what);
                   2657: 	foreach my $key (@keys) {
                   2658: 	    delete($hashref->{$key});
                   2659: 	}
1.315     albertel 2660: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2661: 	    &Reply($client, "ok\n", $userinput);
                   2662: 	} else {
                   2663: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2664: 		    "while attempting del\n", $userinput);
                   2665: 	}
                   2666:     } else {
                   2667: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2668: 		 "while attempting del\n", $userinput);
                   2669:     }
                   2670:     return 1;
                   2671: }
                   2672: &register_handler("del", \&delete_profile_entry, 0, 1, 0);
1.263     albertel 2673: 
1.231     foxr     2674: #
                   2675: #  List the set of keys that are defined in a profile database file.
                   2676: #  A successful reply from this will contain an & separated list of
                   2677: #  the keys. 
                   2678: # Parameters:
                   2679: #     $cmd              - Command request (keys).
                   2680: #     $tail             - Remainder of the request, a colon separated
                   2681: #                         list containing domain/user that identifies the
                   2682: #                         user being queried, and the database namespace
                   2683: #                         (database filename essentially).
                   2684: #     $client           - File open on the client.
                   2685: #  Returns:
                   2686: #    1    - Continue processing.
                   2687: #    0    - Exit the server.
                   2688: #
                   2689: sub get_profile_keys {
                   2690:     my ($cmd, $tail, $client) = @_;
                   2691: 
                   2692:     my $userinput = "$cmd:$tail";
                   2693: 
                   2694:     my ($udom,$uname,$namespace)=split(/:/,$tail);
                   2695:     my $qresult='';
                   2696:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2697: 				  &GDBM_READER());
                   2698:     if ($hashref) {
                   2699: 	foreach my $key (keys %$hashref) {
                   2700: 	    $qresult.="$key&";
                   2701: 	}
1.315     albertel 2702: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2703: 	    $qresult=~s/\&$//;
                   2704: 	    &Reply($client, "$qresult\n", $userinput);
                   2705: 	} else {
                   2706: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2707: 		    "while attempting keys\n", $userinput);
                   2708: 	}
                   2709:     } else {
                   2710: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2711: 		 "while attempting keys\n", $userinput);
                   2712:     }
                   2713:    
                   2714:     return 1;
                   2715: }
                   2716: &register_handler("keys", \&get_profile_keys, 0, 1, 0);
                   2717: 
                   2718: #
                   2719: #   Dump the contents of a user profile database.
                   2720: #   Note that this constitutes a very large covert channel too since
                   2721: #   the dump will return sensitive information that is not encrypted.
                   2722: #   The naive security assumption is that the session negotiation ensures
                   2723: #   our client is trusted and I don't believe that's assured at present.
                   2724: #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
                   2725: #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
                   2726: # 
                   2727: #  Parameters:
                   2728: #     $cmd           - The command request keyword (currentdump).
                   2729: #     $tail          - Remainder of the request, consisting of a colon
                   2730: #                      separated list that has the domain/username and
                   2731: #                      the namespace to dump (database file).
                   2732: #     $client        - file open on the remote client.
                   2733: # Returns:
                   2734: #     1    - Continue processing.
                   2735: #     0    - Exit the server.
                   2736: #
                   2737: sub dump_profile_database {
                   2738:     my ($cmd, $tail, $client) = @_;
                   2739: 
                   2740:     my $userinput = "$cmd:$tail";
                   2741:    
                   2742:     my ($udom,$uname,$namespace) = split(/:/,$tail);
                   2743:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2744: 				 &GDBM_READER());
                   2745:     if ($hashref) {
                   2746: 	# Structure of %data:
                   2747: 	# $data{$symb}->{$parameter}=$value;
                   2748: 	# $data{$symb}->{'v.'.$parameter}=$version;
                   2749: 	# since $parameter will be unescaped, we do not
                   2750:  	# have to worry about silly parameter names...
                   2751: 	
                   2752:         my $qresult='';
                   2753: 	my %data = ();                     # A hash of anonymous hashes..
                   2754: 	while (my ($key,$value) = each(%$hashref)) {
                   2755: 	    my ($v,$symb,$param) = split(/:/,$key);
                   2756: 	    next if ($v eq 'version' || $symb eq 'keys');
                   2757: 	    next if (exists($data{$symb}) && 
                   2758: 		     exists($data{$symb}->{$param}) &&
                   2759: 		     $data{$symb}->{'v.'.$param} > $v);
                   2760: 	    $data{$symb}->{$param}=$value;
                   2761: 	    $data{$symb}->{'v.'.$param}=$v;
                   2762: 	}
1.311     albertel 2763: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2764: 	    while (my ($symb,$param_hash) = each(%data)) {
                   2765: 		while(my ($param,$value) = each (%$param_hash)){
                   2766: 		    next if ($param =~ /^v\./);       # Ignore versions...
                   2767: 		    #
                   2768: 		    #   Just dump the symb=value pairs separated by &
                   2769: 		    #
                   2770: 		    $qresult.=$symb.':'.$param.'='.$value.'&';
                   2771: 		}
                   2772: 	    }
                   2773: 	    chop($qresult);
                   2774: 	    &Reply($client , "$qresult\n", $userinput);
                   2775: 	} else {
                   2776: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2777: 		     "while attempting currentdump\n", $userinput);
                   2778: 	}
                   2779:     } else {
                   2780: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2781: 		"while attempting currentdump\n", $userinput);
                   2782:     }
                   2783: 
                   2784:     return 1;
                   2785: }
                   2786: &register_handler("currentdump", \&dump_profile_database, 0, 1, 0);
                   2787: 
                   2788: #
                   2789: #   Dump a profile database with an optional regular expression
                   2790: #   to match against the keys.  In this dump, no effort is made
                   2791: #   to separate symb from version information. Presumably the
                   2792: #   databases that are dumped by this command are of a different
                   2793: #   structure.  Need to look at this and improve the documentation of
                   2794: #   both this and the currentdump handler.
                   2795: # Parameters:
                   2796: #    $cmd                     - The command keyword.
                   2797: #    $tail                    - All of the characters after the $cmd:
                   2798: #                               These are expected to be a colon
                   2799: #                               separated list containing:
                   2800: #                               domain/user - identifying the user.
                   2801: #                               namespace   - identifying the database.
                   2802: #                               regexp      - optional regular expression
                   2803: #                                             that is matched against
                   2804: #                                             database keywords to do
                   2805: #                                             selective dumps.
                   2806: #   $client                   - Channel open on the client.
                   2807: # Returns:
                   2808: #    1    - Continue processing.
                   2809: # Side effects:
                   2810: #    response is written to $client.
                   2811: #
                   2812: sub dump_with_regexp {
                   2813:     my ($cmd, $tail, $client) = @_;
                   2814: 
                   2815: 
                   2816:     my $userinput = "$cmd:$tail";
                   2817: 
1.306     albertel 2818:     my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
1.231     foxr     2819:     if (defined($regexp)) {
                   2820: 	$regexp=&unescape($regexp);
                   2821:     } else {
                   2822: 	$regexp='.';
                   2823:     }
1.306     albertel 2824:     my ($start,$end);
                   2825:     if (defined($range)) {
                   2826: 	if ($range =~/^(\d+)\-(\d+)$/) {
                   2827: 	    ($start,$end) = ($1,$2);
                   2828: 	} elsif ($range =~/^(\d+)$/) {
                   2829: 	    ($start,$end) = (0,$1);
                   2830: 	} else {
                   2831: 	    undef($range);
                   2832: 	}
                   2833:     }
1.231     foxr     2834:     my $hashref = &tie_user_hash($udom, $uname, $namespace,
                   2835: 				 &GDBM_READER());
                   2836:     if ($hashref) {
                   2837:         my $qresult='';
1.306     albertel 2838: 	my $count=0;
1.231     foxr     2839: 	while (my ($key,$value) = each(%$hashref)) {
                   2840: 	    if ($regexp eq '.') {
1.306     albertel 2841: 		$count++;
                   2842: 		if (defined($range) && $count >= $end)   { last; }
                   2843: 		if (defined($range) && $count <  $start) { next; }
1.231     foxr     2844: 		$qresult.=$key.'='.$value.'&';
                   2845: 	    } else {
                   2846: 		my $unescapeKey = &unescape($key);
                   2847: 		if (eval('$unescapeKey=~/$regexp/')) {
1.306     albertel 2848: 		    $count++;
                   2849: 		    if (defined($range) && $count >= $end)   { last; }
                   2850: 		    if (defined($range) && $count <  $start) { next; }
1.231     foxr     2851: 		    $qresult.="$key=$value&";
                   2852: 		}
                   2853: 	    }
                   2854: 	}
1.311     albertel 2855: 	if (&untie_user_hash($hashref)) {
1.231     foxr     2856: 	    chop($qresult);
                   2857: 	    &Reply($client, "$qresult\n", $userinput);
                   2858: 	} else {
                   2859: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2860: 		     "while attempting dump\n", $userinput);
                   2861: 	}
                   2862:     } else {
                   2863: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2864: 		"while attempting dump\n", $userinput);
                   2865:     }
                   2866: 
                   2867:     return 1;
                   2868: }
                   2869: &register_handler("dump", \&dump_with_regexp, 0, 1, 0);
                   2870: 
                   2871: #  Store a set of key=value pairs associated with a versioned name.
                   2872: #
                   2873: #  Parameters:
                   2874: #    $cmd                - Request command keyword.
                   2875: #    $tail               - Tail of the request.  This is a colon
                   2876: #                          separated list containing:
                   2877: #                          domain/user - User and authentication domain.
                   2878: #                          namespace   - Name of the database being modified
                   2879: #                          rid         - Resource keyword to modify.
                   2880: #                          what        - new value associated with rid.
                   2881: #
                   2882: #    $client             - Socket open on the client.
                   2883: #
                   2884: #
                   2885: #  Returns:
                   2886: #      1 (keep on processing).
                   2887: #  Side-Effects:
                   2888: #    Writes to the client
                   2889: sub store_handler {
                   2890:     my ($cmd, $tail, $client) = @_;
                   2891:  
                   2892:     my $userinput = "$cmd:$tail";
                   2893: 
                   2894:     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
                   2895:     if ($namespace ne 'roles') {
                   2896: 
                   2897: 	chomp($what);
                   2898: 	my @pairs=split(/\&/,$what);
                   2899: 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
1.268     albertel 2900: 				       &GDBM_WRCREAT(), "S",
1.231     foxr     2901: 				       "$rid:$what");
                   2902: 	if ($hashref) {
                   2903: 	    my $now = time;
                   2904: 	    my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
                   2905: 	    my $key;
                   2906: 	    $hashref->{"version:$rid"}++;
                   2907: 	    my $version=$hashref->{"version:$rid"};
                   2908: 	    my $allkeys=''; 
                   2909: 	    foreach my $pair (@pairs) {
                   2910: 		my ($key,$value)=split(/=/,$pair);
                   2911: 		$allkeys.=$key.':';
                   2912: 		$hashref->{"$version:$rid:$key"}=$value;
                   2913: 	    }
                   2914: 	    $hashref->{"$version:$rid:timestamp"}=$now;
                   2915: 	    $allkeys.='timestamp';
                   2916: 	    $hashref->{"$version:keys:$rid"}=$allkeys;
1.311     albertel 2917: 	    if (&untie_user_hash($hashref)) {
1.231     foxr     2918: 		&Reply($client, "ok\n", $userinput);
                   2919: 	    } else {
                   2920: 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2921: 			"while attempting store\n", $userinput);
                   2922: 	    }
                   2923: 	} else {
                   2924: 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2925: 		     "while attempting store\n", $userinput);
                   2926: 	}
                   2927:     } else {
                   2928: 	&Failure($client, "refused\n", $userinput);
                   2929:     }
                   2930: 
                   2931:     return 1;
                   2932: }
                   2933: &register_handler("store", \&store_handler, 0, 1, 0);
1.263     albertel 2934: 
1.323     albertel 2935: #  Modify a set of key=value pairs associated with a versioned name.
                   2936: #
                   2937: #  Parameters:
                   2938: #    $cmd                - Request command keyword.
                   2939: #    $tail               - Tail of the request.  This is a colon
                   2940: #                          separated list containing:
                   2941: #                          domain/user - User and authentication domain.
                   2942: #                          namespace   - Name of the database being modified
                   2943: #                          rid         - Resource keyword to modify.
                   2944: #                          v           - Version item to modify
                   2945: #                          what        - new value associated with rid.
                   2946: #
                   2947: #    $client             - Socket open on the client.
                   2948: #
                   2949: #
                   2950: #  Returns:
                   2951: #      1 (keep on processing).
                   2952: #  Side-Effects:
                   2953: #    Writes to the client
                   2954: sub putstore_handler {
                   2955:     my ($cmd, $tail, $client) = @_;
                   2956:  
                   2957:     my $userinput = "$cmd:$tail";
                   2958: 
                   2959:     my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail);
                   2960:     if ($namespace ne 'roles') {
                   2961: 
                   2962: 	chomp($what);
                   2963: 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
                   2964: 				       &GDBM_WRCREAT(), "M",
                   2965: 				       "$rid:$v:$what");
                   2966: 	if ($hashref) {
                   2967: 	    my $now = time;
                   2968: 	    my %data = &hash_extract($what);
                   2969: 	    my @allkeys;
                   2970: 	    while (my($key,$value) = each(%data)) {
                   2971: 		push(@allkeys,$key);
                   2972: 		$hashref->{"$v:$rid:$key"} = $value;
                   2973: 	    }
                   2974: 	    my $allkeys = join(':',@allkeys);
                   2975: 	    $hashref->{"$v:keys:$rid"}=$allkeys;
                   2976: 
                   2977: 	    if (&untie_user_hash($hashref)) {
                   2978: 		&Reply($client, "ok\n", $userinput);
                   2979: 	    } else {
                   2980: 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2981: 			"while attempting store\n", $userinput);
                   2982: 	    }
                   2983: 	} else {
                   2984: 	    &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2985: 		     "while attempting store\n", $userinput);
                   2986: 	}
                   2987:     } else {
                   2988: 	&Failure($client, "refused\n", $userinput);
                   2989:     }
                   2990: 
                   2991:     return 1;
                   2992: }
                   2993: &register_handler("putstore", \&putstore_handler, 0, 1, 0);
                   2994: 
                   2995: sub hash_extract {
                   2996:     my ($str)=@_;
                   2997:     my %hash;
                   2998:     foreach my $pair (split(/\&/,$str)) {
                   2999: 	my ($key,$value)=split(/=/,$pair);
                   3000: 	$hash{$key}=$value;
                   3001:     }
                   3002:     return (%hash);
                   3003: }
                   3004: sub hash_to_str {
                   3005:     my ($hash_ref)=@_;
                   3006:     my $str;
                   3007:     foreach my $key (keys(%$hash_ref)) {
                   3008: 	$str.=$key.'='.$hash_ref->{$key}.'&';
                   3009:     }
                   3010:     $str=~s/\&$//;
                   3011:     return $str;
                   3012: }
                   3013: 
1.231     foxr     3014: #
                   3015: #  Dump out all versions of a resource that has key=value pairs associated
                   3016: # with it for each version.  These resources are built up via the store
                   3017: # command.
                   3018: #
                   3019: #  Parameters:
                   3020: #     $cmd               - Command keyword.
                   3021: #     $tail              - Remainder of the request which consists of:
                   3022: #                          domain/user   - User and auth. domain.
                   3023: #                          namespace     - name of resource database.
                   3024: #                          rid           - Resource id.
                   3025: #    $client             - socket open on the client.
                   3026: #
                   3027: # Returns:
                   3028: #      1  indicating the caller should not yet exit.
                   3029: # Side-effects:
                   3030: #   Writes a reply to the client.
                   3031: #   The reply is a string of the following shape:
                   3032: #   version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
                   3033: #    Where the 1 above represents version 1.
                   3034: #    this continues for all pairs of keys in all versions.
                   3035: #
                   3036: #
                   3037: #    
                   3038: #
                   3039: sub restore_handler {
                   3040:     my ($cmd, $tail, $client) = @_;
                   3041: 
                   3042:     my $userinput = "$cmd:$tail";	# Only used for logging purposes.
                   3043: 
                   3044:     my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
                   3045:     $namespace=~s/\//\_/g;
                   3046:     $namespace=~s/\W//g;
                   3047:     chomp($rid);
                   3048:     my $qresult='';
1.309     albertel 3049:     my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
                   3050:     if ($hashref) {
                   3051: 	my $version=$hashref->{"version:$rid"};
1.231     foxr     3052: 	$qresult.="version=$version&";
                   3053: 	my $scope;
                   3054: 	for ($scope=1;$scope<=$version;$scope++) {
1.309     albertel 3055: 	    my $vkeys=$hashref->{"$scope:keys:$rid"};
1.231     foxr     3056: 	    my @keys=split(/:/,$vkeys);
                   3057: 	    my $key;
                   3058: 	    $qresult.="$scope:keys=$vkeys&";
                   3059: 	    foreach $key (@keys) {
1.309     albertel 3060: 		$qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
1.231     foxr     3061: 	    }                                  
                   3062: 	}
1.311     albertel 3063: 	if (&untie_user_hash($hashref)) {
1.231     foxr     3064: 	    $qresult=~s/\&$//;
                   3065: 	    &Reply( $client, "$qresult\n", $userinput);
                   3066: 	} else {
                   3067: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3068: 		    "while attempting restore\n", $userinput);
                   3069: 	}
                   3070:     } else {
                   3071: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3072: 		"while attempting restore\n", $userinput);
                   3073:     }
                   3074:   
                   3075:     return 1;
                   3076: 
                   3077: 
                   3078: }
                   3079: &register_handler("restore", \&restore_handler, 0,1,0);
1.234     foxr     3080: 
                   3081: #
1.324     raeburn  3082: #   Add a chat message to a synchronous discussion board.
1.234     foxr     3083: #
                   3084: # Parameters:
                   3085: #    $cmd                - Request keyword.
                   3086: #    $tail               - Tail of the command. A colon separated list
                   3087: #                          containing:
                   3088: #                          cdom    - Domain on which the chat board lives
1.324     raeburn  3089: #                          cnum    - Course containing the chat board.
                   3090: #                          newpost - Body of the posting.
                   3091: #                          group   - Optional group, if chat board is only 
                   3092: #                                    accessible in a group within the course 
1.234     foxr     3093: #   $client              - Socket open on the client.
                   3094: # Returns:
                   3095: #   1    - Indicating caller should keep on processing.
                   3096: #
                   3097: # Side-effects:
                   3098: #   writes a reply to the client.
                   3099: #
                   3100: #
                   3101: sub send_chat_handler {
                   3102:     my ($cmd, $tail, $client) = @_;
                   3103: 
                   3104:     
                   3105:     my $userinput = "$cmd:$tail";
                   3106: 
1.324     raeburn  3107:     my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail);
                   3108:     &chat_add($cdom,$cnum,$newpost,$group);
1.234     foxr     3109:     &Reply($client, "ok\n", $userinput);
                   3110: 
                   3111:     return 1;
                   3112: }
                   3113: &register_handler("chatsend", \&send_chat_handler, 0, 1, 0);
1.263     albertel 3114: 
1.234     foxr     3115: #
1.324     raeburn  3116: #   Retrieve the set of chat messages from a discussion board.
1.234     foxr     3117: #
                   3118: #  Parameters:
                   3119: #    $cmd             - Command keyword that initiated the request.
                   3120: #    $tail            - Remainder of the request after the command
                   3121: #                       keyword.  In this case a colon separated list of
                   3122: #                       chat domain    - Which discussion board.
                   3123: #                       chat id        - Discussion thread(?)
                   3124: #                       domain/user    - Authentication domain and username
                   3125: #                                        of the requesting person.
1.324     raeburn  3126: #                       group          - Optional course group containing
                   3127: #                                        the board.      
1.234     foxr     3128: #   $client           - Socket open on the client program.
                   3129: # Returns:
                   3130: #    1     - continue processing
                   3131: # Side effects:
                   3132: #    Response is written to the client.
                   3133: #
                   3134: sub retrieve_chat_handler {
                   3135:     my ($cmd, $tail, $client) = @_;
                   3136: 
                   3137: 
                   3138:     my $userinput = "$cmd:$tail";
                   3139: 
1.324     raeburn  3140:     my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
1.234     foxr     3141:     my $reply='';
1.324     raeburn  3142:     foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
1.234     foxr     3143: 	$reply.=&escape($_).':';
                   3144:     }
                   3145:     $reply=~s/\:$//;
                   3146:     &Reply($client, $reply."\n", $userinput);
                   3147: 
                   3148: 
                   3149:     return 1;
                   3150: }
                   3151: &register_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
                   3152: 
                   3153: #
                   3154: #  Initiate a query of an sql database.  SQL query repsonses get put in
                   3155: #  a file for later retrieval.  This prevents sql query results from
                   3156: #  bottlenecking the system.  Note that with loncnew, perhaps this is
                   3157: #  less of an issue since multiple outstanding requests can be concurrently
                   3158: #  serviced.
                   3159: #
                   3160: #  Parameters:
                   3161: #     $cmd       - COmmand keyword that initiated the request.
                   3162: #     $tail      - Remainder of the command after the keyword.
                   3163: #                  For this function, this consists of a query and
                   3164: #                  3 arguments that are self-documentingly labelled
                   3165: #                  in the original arg1, arg2, arg3.
                   3166: #     $client    - Socket open on the client.
                   3167: # Return:
                   3168: #    1   - Indicating processing should continue.
                   3169: # Side-effects:
                   3170: #    a reply is written to $client.
                   3171: #
                   3172: sub send_query_handler {
                   3173:     my ($cmd, $tail, $client) = @_;
                   3174: 
                   3175: 
                   3176:     my $userinput = "$cmd:$tail";
                   3177: 
                   3178:     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
                   3179:     $query=~s/\n*$//g;
                   3180:     &Reply($client, "". &sql_reply("$clientname\&$query".
                   3181: 				"\&$arg1"."\&$arg2"."\&$arg3")."\n",
                   3182: 	  $userinput);
                   3183:     
                   3184:     return 1;
                   3185: }
                   3186: &register_handler("querysend", \&send_query_handler, 0, 1, 0);
                   3187: 
                   3188: #
                   3189: #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
                   3190: #   The query is submitted via a "querysend" transaction.
                   3191: #   There it is passed on to the lonsql daemon, queued and issued to
                   3192: #   mysql.
                   3193: #     This transaction is invoked when the sql transaction is complete
                   3194: #   it stores the query results in flie and indicates query completion.
                   3195: #   presumably local software then fetches this response... I'm guessing
                   3196: #   the sequence is: lonc does a querysend, we ask lonsql to do it.
                   3197: #   lonsql on completion of the query interacts with the lond of our
                   3198: #   client to do a query reply storing two files:
                   3199: #    - id     - The results of the query.
                   3200: #    - id.end - Indicating the transaction completed. 
                   3201: #    NOTE: id is a unique id assigned to the query and querysend time.
                   3202: # Parameters:
                   3203: #    $cmd        - Command keyword that initiated this request.
                   3204: #    $tail       - Remainder of the tail.  In this case that's a colon
                   3205: #                  separated list containing the query Id and the 
                   3206: #                  results of the query.
                   3207: #    $client     - Socket open on the client.
                   3208: # Return:
                   3209: #    1           - Indicating that we should continue processing.
                   3210: # Side effects:
                   3211: #    ok written to the client.
                   3212: #
                   3213: sub reply_query_handler {
                   3214:     my ($cmd, $tail, $client) = @_;
                   3215: 
                   3216: 
                   3217:     my $userinput = "$cmd:$tail";
                   3218: 
                   3219:     my ($cmd,$id,$reply)=split(/:/,$userinput); 
                   3220:     my $store;
                   3221:     my $execdir=$perlvar{'lonDaemons'};
                   3222:     if ($store=IO::File->new(">$execdir/tmp/$id")) {
                   3223: 	$reply=~s/\&/\n/g;
                   3224: 	print $store $reply;
                   3225: 	close $store;
                   3226: 	my $store2=IO::File->new(">$execdir/tmp/$id.end");
                   3227: 	print $store2 "done\n";
                   3228: 	close $store2;
                   3229: 	&Reply($client, "ok\n", $userinput);
                   3230:     } else {
                   3231: 	&Failure($client, "error: ".($!+0)
                   3232: 		." IO::File->new Failed ".
                   3233: 		"while attempting queryreply\n", $userinput);
                   3234:     }
                   3235:  
                   3236: 
                   3237:     return 1;
                   3238: }
                   3239: &register_handler("queryreply", \&reply_query_handler, 0, 1, 0);
                   3240: 
                   3241: #
                   3242: #  Process the courseidput request.  Not quite sure what this means
                   3243: #  at the system level sense.  It appears a gdbm file in the 
                   3244: #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
                   3245: #  a set of entries made in that database.
                   3246: #
                   3247: # Parameters:
                   3248: #   $cmd      - The command keyword that initiated this request.
                   3249: #   $tail     - Tail of the command.  In this case consists of a colon
                   3250: #               separated list contaning the domain to apply this to and
                   3251: #               an ampersand separated list of keyword=value pairs.
1.272     raeburn  3252: #               Each value is a colon separated list that includes:  
                   3253: #               description, institutional code and course owner.
                   3254: #               For backward compatibility with versions included
                   3255: #               in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
                   3256: #               code and/or course owner are preserved from the existing 
                   3257: #               record when writing a new record in response to 1.1 or 
                   3258: #               1.2 implementations of lonnet::flushcourselogs().   
                   3259: #                      
1.234     foxr     3260: #   $client   - Socket open on the client.
                   3261: # Returns:
                   3262: #   1    - indicating that processing should continue
                   3263: #
                   3264: # Side effects:
                   3265: #   reply is written to the client.
                   3266: #
                   3267: sub put_course_id_handler {
                   3268:     my ($cmd, $tail, $client) = @_;
                   3269: 
                   3270: 
                   3271:     my $userinput = "$cmd:$tail";
                   3272: 
1.266     raeburn  3273:     my ($udom, $what) = split(/:/, $tail,2);
1.234     foxr     3274:     chomp($what);
                   3275:     my $now=time;
                   3276:     my @pairs=split(/\&/,$what);
                   3277: 
                   3278:     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
                   3279:     if ($hashref) {
                   3280: 	foreach my $pair (@pairs) {
1.271     raeburn  3281:             my ($key,$courseinfo) = split(/=/,$pair,2);
                   3282:             $courseinfo =~ s/=/:/g;
1.272     raeburn  3283: 
1.273     albertel 3284:             my @current_items = split(/:/,$hashref->{$key});
                   3285:             shift(@current_items); # remove description
                   3286:             pop(@current_items);   # remove last access
1.272     raeburn  3287:             my $numcurrent = scalar(@current_items);
                   3288: 
1.273     albertel 3289:             my @new_items = split(/:/,$courseinfo);
1.272     raeburn  3290:             my $numnew = scalar(@new_items);
                   3291:             if ($numcurrent > 0) {
1.333     raeburn  3292:                 if ($numnew <= $numcurrent) { # flushcourselogs() from pre 2.2 
                   3293:                     for (my $j=$numcurrent-$numnew; $j>=0; $j--) {
                   3294:                         $courseinfo .= ':'.$current_items[$numcurrent-$j-1];
                   3295:                     }
1.272     raeburn  3296:                 }
                   3297:             }
1.266     raeburn  3298: 	    $hashref->{$key}=$courseinfo.':'.$now;
1.234     foxr     3299: 	}
1.311     albertel 3300: 	if (&untie_domain_hash($hashref)) {
1.253     foxr     3301: 	    &Reply( $client, "ok\n", $userinput);
1.234     foxr     3302: 	} else {
1.253     foxr     3303: 	    &Failure($client, "error: ".($!+0)
1.234     foxr     3304: 		     ." untie(GDBM) Failed ".
                   3305: 		     "while attempting courseidput\n", $userinput);
                   3306: 	}
                   3307:     } else {
1.253     foxr     3308: 	&Failure($client, "error: ".($!+0)
1.234     foxr     3309: 		 ." tie(GDBM) Failed ".
                   3310: 		 "while attempting courseidput\n", $userinput);
                   3311:     }
1.253     foxr     3312:     
1.234     foxr     3313: 
                   3314:     return 1;
                   3315: }
                   3316: &register_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
                   3317: 
                   3318: #  Retrieves the value of a course id resource keyword pattern
                   3319: #  defined since a starting date.  Both the starting date and the
                   3320: #  keyword pattern are optional.  If the starting date is not supplied it
                   3321: #  is treated as the beginning of time.  If the pattern is not found,
                   3322: #  it is treatred as "." matching everything.
                   3323: #
                   3324: #  Parameters:
                   3325: #     $cmd     - Command keyword that resulted in us being dispatched.
                   3326: #     $tail    - The remainder of the command that, in this case, consists
                   3327: #                of a colon separated list of:
                   3328: #                 domain   - The domain in which the course database is 
                   3329: #                            defined.
                   3330: #                 since    - Optional parameter describing the minimum
                   3331: #                            time of definition(?) of the resources that
                   3332: #                            will match the dump.
                   3333: #                 description - regular expression that is used to filter
                   3334: #                            the dump.  Only keywords matching this regexp
                   3335: #                            will be used.
1.272     raeburn  3336: #                 institutional code - optional supplied code to filter 
                   3337: #                            the dump. Only courses with an institutional code 
                   3338: #                            that match the supplied code will be returned.
                   3339: #                 owner    - optional supplied username of owner to filter
                   3340: #                            the dump.  Only courses for which the course 
                   3341: #                            owner matches the supplied username will be
1.274     albertel 3342: #                            returned. Implicit assumption that owner
                   3343: #                            is a user in the domain in which the
                   3344: #                            course database is defined.
1.234     foxr     3345: #     $client  - The socket open on the client.
                   3346: # Returns:
                   3347: #    1     - Continue processing.
                   3348: # Side Effects:
                   3349: #   a reply is written to $client.
                   3350: sub dump_course_id_handler {
                   3351:     my ($cmd, $tail, $client) = @_;
                   3352: 
                   3353:     my $userinput = "$cmd:$tail";
                   3354: 
1.333     raeburn  3355:     my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
                   3356:         $typefilter) =split(/:/,$tail);
1.234     foxr     3357:     if (defined($description)) {
                   3358: 	$description=&unescape($description);
                   3359:     } else {
                   3360: 	$description='.';
                   3361:     }
1.266     raeburn  3362:     if (defined($instcodefilter)) {
                   3363:         $instcodefilter=&unescape($instcodefilter);
                   3364:     } else {
                   3365:         $instcodefilter='.';
                   3366:     }
                   3367:     if (defined($ownerfilter)) {
                   3368:         $ownerfilter=&unescape($ownerfilter);
                   3369:     } else {
                   3370:         $ownerfilter='.';
                   3371:     }
1.282     raeburn  3372:     if (defined($coursefilter)) {
                   3373:         $coursefilter=&unescape($coursefilter);
                   3374:     } else {
                   3375:         $coursefilter='.';
                   3376:     }
1.333     raeburn  3377:     if (defined($typefilter)) {
                   3378:         $typefilter=&unescape($typefilter);
                   3379:     } else {
                   3380:         $typefilter='.';
                   3381:     }
1.266     raeburn  3382: 
1.234     foxr     3383:     unless (defined($since)) { $since=0; }
                   3384:     my $qresult='';
                   3385:     my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
                   3386:     if ($hashref) {
                   3387: 	while (my ($key,$value) = each(%$hashref)) {
1.333     raeburn  3388: 	    my ($descr,$lasttime,$inst_code,$owner,$type);
1.274     albertel 3389:             my @courseitems = split(/:/,$value);
                   3390:             $lasttime = pop(@courseitems);
1.333     raeburn  3391: 	    ($descr,$inst_code,$owner,$type)=@courseitems;
1.234     foxr     3392: 	    if ($lasttime<$since) { next; }
1.266     raeburn  3393:             my $match = 1;
                   3394: 	    unless ($description eq '.') {
                   3395: 		my $unescapeDescr = &unescape($descr);
                   3396: 		unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
                   3397:                     $match = 0;
1.234     foxr     3398: 		}
1.266     raeburn  3399:             }
                   3400:             unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
                   3401:                 my $unescapeInstcode = &unescape($inst_code);
                   3402:                 unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
                   3403:                     $match = 0;
                   3404:                 }
1.234     foxr     3405: 	    }
1.266     raeburn  3406:             unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
                   3407:                 my $unescapeOwner = &unescape($owner);
                   3408:                 unless (eval('$unescapeOwner=~/\Q$ownerfilter\E/i')) {
                   3409:                     $match = 0;
                   3410:                 }
                   3411:             }
1.282     raeburn  3412:             unless ($coursefilter eq '.' || !defined($coursefilter)) {
                   3413:                 my $unescapeCourse = &unescape($key);
                   3414:                 unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
                   3415:                     $match = 0;
                   3416:                 }
                   3417:             }
1.333     raeburn  3418:             unless ($typefilter eq '.' || !defined($typefilter)) {
                   3419:                 my $unescapeType = &unescape($type);
                   3420:                 if (!defined($type)) {
                   3421:                     if ($typefilter ne 'Course') {
                   3422:                         $match = 0;
                   3423:                     }
                   3424:                 } else { 
                   3425:                     unless (eval('$unescapeType=~/^\Q$typefilter\E$/')) {
                   3426:                         $match = 0;
                   3427:                     }
                   3428:                 }
                   3429:             }
1.266     raeburn  3430:             if ($match == 1) {
                   3431:                 $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
                   3432:             }
1.234     foxr     3433: 	}
1.311     albertel 3434: 	if (&untie_domain_hash($hashref)) {
1.234     foxr     3435: 	    chop($qresult);
                   3436: 	    &Reply($client, "$qresult\n", $userinput);
                   3437: 	} else {
                   3438: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3439: 		    "while attempting courseiddump\n", $userinput);
                   3440: 	}
                   3441:     } else {
                   3442: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3443: 		"while attempting courseiddump\n", $userinput);
                   3444:     }
                   3445: 
                   3446: 
                   3447:     return 1;
                   3448: }
                   3449: &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
1.238     foxr     3450: 
                   3451: #
                   3452: #  Puts an id to a domains id database. 
                   3453: #
                   3454: #  Parameters:
                   3455: #   $cmd     - The command that triggered us.
                   3456: #   $tail    - Remainder of the request other than the command. This is a 
                   3457: #              colon separated list containing:
                   3458: #              $domain  - The domain for which we are writing the id.
                   3459: #              $pairs  - The id info to write... this is and & separated list
                   3460: #                        of keyword=value.
                   3461: #   $client  - Socket open on the client.
                   3462: #  Returns:
                   3463: #    1   - Continue processing.
                   3464: #  Side effects:
                   3465: #     reply is written to $client.
                   3466: #
                   3467: sub put_id_handler {
                   3468:     my ($cmd,$tail,$client) = @_;
                   3469: 
                   3470: 
                   3471:     my $userinput = "$cmd:$tail";
                   3472: 
                   3473:     my ($udom,$what)=split(/:/,$tail);
                   3474:     chomp($what);
                   3475:     my @pairs=split(/\&/,$what);
                   3476:     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
                   3477: 				   "P", $what);
                   3478:     if ($hashref) {
                   3479: 	foreach my $pair (@pairs) {
                   3480: 	    my ($key,$value)=split(/=/,$pair);
                   3481: 	    $hashref->{$key}=$value;
                   3482: 	}
1.311     albertel 3483: 	if (&untie_domain_hash($hashref)) {
1.238     foxr     3484: 	    &Reply($client, "ok\n", $userinput);
                   3485: 	} else {
                   3486: 	    &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3487: 		     "while attempting idput\n", $userinput);
                   3488: 	}
                   3489:     } else {
                   3490: 	&Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3491: 		  "while attempting idput\n", $userinput);
                   3492:     }
                   3493: 
                   3494:     return 1;
                   3495: }
1.263     albertel 3496: &register_handler("idput", \&put_id_handler, 0, 1, 0);
1.238     foxr     3497: 
                   3498: #
                   3499: #  Retrieves a set of id values from the id database.
                   3500: #  Returns an & separated list of results, one for each requested id to the
                   3501: #  client.
                   3502: #
                   3503: # Parameters:
                   3504: #   $cmd       - Command keyword that caused us to be dispatched.
                   3505: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3506: #               domain - the domain whose id table we dump
                   3507: #               ids      Consists of an & separated list of
                   3508: #                        id keywords whose values will be fetched.
                   3509: #                        nonexisting keywords will have an empty value.
                   3510: #   $client    - Socket open on the client.
                   3511: #
                   3512: # Returns:
                   3513: #    1 - indicating processing should continue.
                   3514: # Side effects:
                   3515: #   An & separated list of results is written to $client.
                   3516: #
                   3517: sub get_id_handler {
                   3518:     my ($cmd, $tail, $client) = @_;
                   3519: 
                   3520:     
                   3521:     my $userinput = "$client:$tail";
                   3522:     
                   3523:     my ($udom,$what)=split(/:/,$tail);
                   3524:     chomp($what);
                   3525:     my @queries=split(/\&/,$what);
                   3526:     my $qresult='';
                   3527:     my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
                   3528:     if ($hashref) {
                   3529: 	for (my $i=0;$i<=$#queries;$i++) {
                   3530: 	    $qresult.="$hashref->{$queries[$i]}&";
                   3531: 	}
1.311     albertel 3532: 	if (&untie_domain_hash($hashref)) {
1.238     foxr     3533: 	    $qresult=~s/\&$//;
                   3534: 	    &Reply($client, "$qresult\n", $userinput);
                   3535: 	} else {
                   3536: 	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3537: 		      "while attempting idget\n",$userinput);
                   3538: 	}
                   3539:     } else {
                   3540: 	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3541: 		 "while attempting idget\n",$userinput);
                   3542:     }
                   3543:     
                   3544:     return 1;
                   3545: }
1.263     albertel 3546: &register_handler("idget", \&get_id_handler, 0, 1, 0);
1.238     foxr     3547: 
                   3548: #
1.299     raeburn  3549: # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database 
                   3550: #
                   3551: # Parameters
                   3552: #   $cmd       - Command keyword that caused us to be dispatched.
                   3553: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3554: #               domain - the domain whose dcmail we are recording
                   3555: #               email    Consists of key=value pair 
                   3556: #                        where key is unique msgid
                   3557: #                        and value is message (in XML)
                   3558: #   $client    - Socket open on the client.
                   3559: #
                   3560: # Returns:
                   3561: #    1 - indicating processing should continue.
                   3562: # Side effects
                   3563: #     reply is written to $client.
                   3564: #
                   3565: sub put_dcmail_handler {
                   3566:     my ($cmd,$tail,$client) = @_;
                   3567:     my $userinput = "$cmd:$tail";
                   3568:                                                                                 
                   3569:     my ($udom,$what)=split(/:/,$tail);
                   3570:     chomp($what);
                   3571:     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
                   3572:     if ($hashref) {
                   3573:         my ($key,$value)=split(/=/,$what);
                   3574:         $hashref->{$key}=$value;
                   3575:     }
1.311     albertel 3576:     if (&untie_domain_hash($hashref)) {
1.299     raeburn  3577:         &Reply($client, "ok\n", $userinput);
                   3578:     } else {
                   3579:         &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3580:                  "while attempting dcmailput\n", $userinput);
                   3581:     }
                   3582:     return 1;
                   3583: }
                   3584: &register_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
                   3585: 
                   3586: #
                   3587: # Retrieves broadcast e-mail from nohist_dcmail database
                   3588: # Returns to client an & separated list of key=value pairs,
                   3589: # where key is msgid and value is message information.
                   3590: #
                   3591: # Parameters
                   3592: #   $cmd       - Command keyword that caused us to be dispatched.
                   3593: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3594: #               domain - the domain whose dcmail table we dump
                   3595: #               startfilter - beginning of time window 
                   3596: #               endfilter - end of time window
                   3597: #               sendersfilter - & separated list of username:domain 
                   3598: #                 for senders to search for.
                   3599: #   $client    - Socket open on the client.
                   3600: #
                   3601: # Returns:
                   3602: #    1 - indicating processing should continue.
                   3603: # Side effects
                   3604: #     reply (& separated list of msgid=messageinfo pairs) is 
                   3605: #     written to $client.
                   3606: #
                   3607: sub dump_dcmail_handler {
                   3608:     my ($cmd, $tail, $client) = @_;
                   3609:                                                                                 
                   3610:     my $userinput = "$cmd:$tail";
                   3611:     my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
                   3612:     chomp($sendersfilter);
                   3613:     my @senders = ();
                   3614:     if (defined($startfilter)) {
                   3615:         $startfilter=&unescape($startfilter);
                   3616:     } else {
                   3617:         $startfilter='.';
                   3618:     }
                   3619:     if (defined($endfilter)) {
                   3620:         $endfilter=&unescape($endfilter);
                   3621:     } else {
                   3622:         $endfilter='.';
                   3623:     }
                   3624:     if (defined($sendersfilter)) {
                   3625:         $sendersfilter=&unescape($sendersfilter);
1.300     albertel 3626: 	@senders = map { &unescape($_) } split(/\&/,$sendersfilter);
1.299     raeburn  3627:     }
                   3628: 
                   3629:     my $qresult='';
                   3630:     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
                   3631:     if ($hashref) {
                   3632:         while (my ($key,$value) = each(%$hashref)) {
                   3633:             my $match = 1;
1.303     albertel 3634:             my ($timestamp,$subj,$uname,$udom) = 
                   3635: 		split(/:/,&unescape(&unescape($key)),5); # yes, twice really
1.299     raeburn  3636:             $subj = &unescape($subj);
                   3637:             unless ($startfilter eq '.' || !defined($startfilter)) {
                   3638:                 if ($timestamp < $startfilter) {
                   3639:                     $match = 0;
                   3640:                 }
                   3641:             }
                   3642:             unless ($endfilter eq '.' || !defined($endfilter)) {
                   3643:                 if ($timestamp > $endfilter) {
                   3644:                     $match = 0;
                   3645:                 }
                   3646:             }
                   3647:             unless (@senders < 1) {
                   3648:                 unless (grep/^$uname:$udom$/,@senders) {
                   3649:                     $match = 0;
                   3650:                 }
                   3651:             }
                   3652:             if ($match == 1) {
                   3653:                 $qresult.=$key.'='.$value.'&';
                   3654:             }
                   3655:         }
1.311     albertel 3656:         if (&untie_domain_hash($hashref)) {
1.299     raeburn  3657:             chop($qresult);
                   3658:             &Reply($client, "$qresult\n", $userinput);
                   3659:         } else {
                   3660:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3661:                     "while attempting dcmaildump\n", $userinput);
                   3662:         }
                   3663:     } else {
                   3664:         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3665:                 "while attempting dcmaildump\n", $userinput);
                   3666:     }
                   3667:     return 1;
                   3668: }
                   3669: 
                   3670: &register_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
                   3671: 
                   3672: #
                   3673: # Puts domain roles in nohist_domainroles database
                   3674: #
                   3675: # Parameters
                   3676: #   $cmd       - Command keyword that caused us to be dispatched.
                   3677: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3678: #               domain - the domain whose roles we are recording  
                   3679: #               role -   Consists of key=value pair
                   3680: #                        where key is unique role
                   3681: #                        and value is start/end date information
                   3682: #   $client    - Socket open on the client.
                   3683: #
                   3684: # Returns:
                   3685: #    1 - indicating processing should continue.
                   3686: # Side effects
                   3687: #     reply is written to $client.
                   3688: #
                   3689: 
                   3690: sub put_domainroles_handler {
                   3691:     my ($cmd,$tail,$client) = @_;
                   3692: 
                   3693:     my $userinput = "$cmd:$tail";
                   3694:     my ($udom,$what)=split(/:/,$tail);
                   3695:     chomp($what);
                   3696:     my @pairs=split(/\&/,$what);
                   3697:     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
                   3698:     if ($hashref) {
                   3699:         foreach my $pair (@pairs) {
                   3700:             my ($key,$value)=split(/=/,$pair);
                   3701:             $hashref->{$key}=$value;
                   3702:         }
1.311     albertel 3703:         if (&untie_domain_hash($hashref)) {
1.299     raeburn  3704:             &Reply($client, "ok\n", $userinput);
                   3705:         } else {
                   3706:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3707:                      "while attempting domroleput\n", $userinput);
                   3708:         }
                   3709:     } else {
                   3710:         &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3711:                   "while attempting domroleput\n", $userinput);
                   3712:     }
                   3713:                                                                                   
                   3714:     return 1;
                   3715: }
                   3716: 
                   3717: &register_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
                   3718: 
                   3719: #
                   3720: # Retrieves domain roles from nohist_domainroles database
                   3721: # Returns to client an & separated list of key=value pairs,
                   3722: # where key is role and value is start and end date information.
                   3723: #
                   3724: # Parameters
                   3725: #   $cmd       - Command keyword that caused us to be dispatched.
                   3726: #   $tail      - Tail of the command.  Consists of a colon separated:
                   3727: #               domain - the domain whose domain roles table we dump
                   3728: #   $client    - Socket open on the client.
                   3729: #
                   3730: # Returns:
                   3731: #    1 - indicating processing should continue.
                   3732: # Side effects
                   3733: #     reply (& separated list of role=start/end info pairs) is
                   3734: #     written to $client.
                   3735: #
                   3736: sub dump_domainroles_handler {
                   3737:     my ($cmd, $tail, $client) = @_;
                   3738:                                                                                            
                   3739:     my $userinput = "$cmd:$tail";
                   3740:     my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
                   3741:     chomp($rolesfilter);
                   3742:     my @roles = ();
                   3743:     if (defined($startfilter)) {
                   3744:         $startfilter=&unescape($startfilter);
                   3745:     } else {
                   3746:         $startfilter='.';
                   3747:     }
                   3748:     if (defined($endfilter)) {
                   3749:         $endfilter=&unescape($endfilter);
                   3750:     } else {
                   3751:         $endfilter='.';
                   3752:     }
                   3753:     if (defined($rolesfilter)) {
                   3754:         $rolesfilter=&unescape($rolesfilter);
1.300     albertel 3755: 	@roles = split(/\&/,$rolesfilter);
1.299     raeburn  3756:     }
                   3757:                                                                                            
                   3758:     my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
                   3759:     if ($hashref) {
                   3760:         my $qresult = '';
                   3761:         while (my ($key,$value) = each(%$hashref)) {
                   3762:             my $match = 1;
                   3763:             my ($start,$end) = split(/:/,&unescape($value));
                   3764:             my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
                   3765:             unless ($startfilter eq '.' || !defined($startfilter)) {
                   3766:                 if ($start >= $startfilter) {
                   3767:                     $match = 0;
                   3768:                 }
                   3769:             }
                   3770:             unless ($endfilter eq '.' || !defined($endfilter)) {
                   3771:                 if ($end <= $endfilter) {
                   3772:                     $match = 0;
                   3773:                 }
                   3774:             }
                   3775:             unless (@roles < 1) {
                   3776:                 unless (grep/^$trole$/,@roles) {
                   3777:                     $match = 0;
                   3778:                 }
                   3779:             }
                   3780:             if ($match == 1) {
                   3781:                 $qresult.=$key.'='.$value.'&';
                   3782:             }
                   3783:         }
1.311     albertel 3784:         if (&untie_domain_hash($hashref)) {
1.299     raeburn  3785:             chop($qresult);
                   3786:             &Reply($client, "$qresult\n", $userinput);
                   3787:         } else {
                   3788:             &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   3789:                     "while attempting domrolesdump\n", $userinput);
                   3790:         }
                   3791:     } else {
                   3792:         &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   3793:                 "while attempting domrolesdump\n", $userinput);
                   3794:     }
                   3795:     return 1;
                   3796: }
                   3797: 
                   3798: &register_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
                   3799: 
                   3800: 
1.238     foxr     3801: #  Process the tmpput command I'm not sure what this does.. Seems to
                   3802: #  create a file in the lonDaemons/tmp directory of the form $id.tmp
                   3803: # where Id is the client's ip concatenated with a sequence number.
                   3804: # The file will contain some value that is passed in.  Is this e.g.
                   3805: # a login token?
                   3806: #
                   3807: # Parameters:
                   3808: #    $cmd     - The command that got us dispatched.
                   3809: #    $tail    - The remainder of the request following $cmd:
                   3810: #               In this case this will be the contents of the file.
                   3811: #    $client  - Socket connected to the client.
                   3812: # Returns:
                   3813: #    1 indicating processing can continue.
                   3814: # Side effects:
                   3815: #   A file is created in the local filesystem.
                   3816: #   A reply is sent to the client.
                   3817: sub tmp_put_handler {
                   3818:     my ($cmd, $what, $client) = @_;
                   3819: 
                   3820:     my $userinput = "$cmd:$what";	# Reconstruct for logging.
                   3821: 
                   3822: 
                   3823:     my $store;
                   3824:     $tmpsnum++;
                   3825:     my $id=$$.'_'.$clientip.'_'.$tmpsnum;
                   3826:     $id=~s/\W/\_/g;
                   3827:     $what=~s/\n//g;
                   3828:     my $execdir=$perlvar{'lonDaemons'};
                   3829:     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
                   3830: 	print $store $what;
                   3831: 	close $store;
                   3832: 	&Reply($client, "$id\n", $userinput);
                   3833:     } else {
                   3834: 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                   3835: 		  "while attempting tmpput\n", $userinput);
                   3836:     }
                   3837:     return 1;
                   3838:   
                   3839: }
                   3840: &register_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
1.263     albertel 3841: 
1.238     foxr     3842: #   Processes the tmpget command.  This command returns the contents
                   3843: #  of a temporary resource file(?) created via tmpput.
                   3844: #
                   3845: # Paramters:
                   3846: #    $cmd      - Command that got us dispatched.
                   3847: #    $id       - Tail of the command, contain the id of the resource
                   3848: #                we want to fetch.
                   3849: #    $client   - socket open on the client.
                   3850: # Return:
                   3851: #    1         - Inidcating processing can continue.
                   3852: # Side effects:
                   3853: #   A reply is sent to the client.
                   3854: #
                   3855: sub tmp_get_handler {
                   3856:     my ($cmd, $id, $client) = @_;
                   3857: 
                   3858:     my $userinput = "$cmd:$id"; 
                   3859:     
                   3860: 
                   3861:     $id=~s/\W/\_/g;
                   3862:     my $store;
                   3863:     my $execdir=$perlvar{'lonDaemons'};
                   3864:     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
                   3865: 	my $reply=<$store>;
                   3866: 	&Reply( $client, "$reply\n", $userinput);
                   3867: 	close $store;
                   3868:     } else {
                   3869: 	&Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                   3870: 		  "while attempting tmpget\n", $userinput);
                   3871:     }
                   3872: 
                   3873:     return 1;
                   3874: }
                   3875: &register_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
1.263     albertel 3876: 
1.238     foxr     3877: #
                   3878: #  Process the tmpdel command.  This command deletes a temp resource
                   3879: #  created by the tmpput command.
                   3880: #
                   3881: # Parameters:
                   3882: #   $cmd      - Command that got us here.
                   3883: #   $id       - Id of the temporary resource created.
                   3884: #   $client   - socket open on the client process.
                   3885: #
                   3886: # Returns:
                   3887: #   1     - Indicating processing should continue.
                   3888: # Side Effects:
                   3889: #   A file is deleted
                   3890: #   A reply is sent to the client.
                   3891: sub tmp_del_handler {
                   3892:     my ($cmd, $id, $client) = @_;
                   3893:     
                   3894:     my $userinput= "$cmd:$id";
                   3895:     
                   3896:     chomp($id);
                   3897:     $id=~s/\W/\_/g;
                   3898:     my $execdir=$perlvar{'lonDaemons'};
                   3899:     if (unlink("$execdir/tmp/$id.tmp")) {
                   3900: 	&Reply($client, "ok\n", $userinput);
                   3901:     } else {
                   3902: 	&Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
                   3903: 		  "while attempting tmpdel\n", $userinput);
                   3904:     }
                   3905:     
                   3906:     return 1;
                   3907: 
                   3908: }
                   3909: &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
1.263     albertel 3910: 
1.238     foxr     3911: #
1.246     foxr     3912: #   Processes the setannounce command.  This command
                   3913: #   creates a file named announce.txt in the top directory of
                   3914: #   the documentn root and sets its contents.  The announce.txt file is
                   3915: #   printed in its entirety at the LonCAPA login page.  Note:
                   3916: #   once the announcement.txt fileis created it cannot be deleted.
                   3917: #   However, setting the contents of the file to empty removes the
                   3918: #   announcement from the login page of loncapa so who cares.
                   3919: #
                   3920: # Parameters:
                   3921: #    $cmd          - The command that got us dispatched.
                   3922: #    $announcement - The text of the announcement.
                   3923: #    $client       - Socket open on the client process.
                   3924: # Retunrns:
                   3925: #   1             - Indicating request processing should continue
                   3926: # Side Effects:
                   3927: #   The file {DocRoot}/announcement.txt is created.
                   3928: #   A reply is sent to $client.
                   3929: #
                   3930: sub set_announce_handler {
                   3931:     my ($cmd, $announcement, $client) = @_;
                   3932:   
                   3933:     my $userinput    = "$cmd:$announcement";
                   3934: 
                   3935:     chomp($announcement);
                   3936:     $announcement=&unescape($announcement);
                   3937:     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
                   3938: 				'/announcement.txt')) {
                   3939: 	print $store $announcement;
                   3940: 	close $store;
                   3941: 	&Reply($client, "ok\n", $userinput);
                   3942:     } else {
                   3943: 	&Failure($client, "error: ".($!+0)."\n", $userinput);
                   3944:     }
                   3945: 
                   3946:     return 1;
                   3947: }
                   3948: &register_handler("setannounce", \&set_announce_handler, 0, 1, 0);
1.263     albertel 3949: 
1.246     foxr     3950: #
                   3951: #  Return the version of the daemon.  This can be used to determine
                   3952: #  the compatibility of cross version installations or, alternatively to
                   3953: #  simply know who's out of date and who isn't.  Note that the version
                   3954: #  is returned concatenated with the tail.
                   3955: # Parameters:
                   3956: #   $cmd        - the request that dispatched to us.
                   3957: #   $tail       - Tail of the request (client's version?).
                   3958: #   $client     - Socket open on the client.
                   3959: #Returns:
                   3960: #   1 - continue processing requests.
                   3961: # Side Effects:
                   3962: #   Replies with version to $client.
                   3963: sub get_version_handler {
                   3964:     my ($cmd, $tail, $client) = @_;
                   3965: 
                   3966:     my $userinput  = $cmd.$tail;
                   3967:     
                   3968:     &Reply($client, &version($userinput)."\n", $userinput);
                   3969: 
                   3970: 
                   3971:     return 1;
                   3972: }
                   3973: &register_handler("version", \&get_version_handler, 0, 1, 0);
1.263     albertel 3974: 
1.246     foxr     3975: #  Set the current host and domain.  This is used to support
                   3976: #  multihomed systems.  Each IP of the system, or even separate daemons
                   3977: #  on the same IP can be treated as handling a separate lonCAPA virtual
                   3978: #  machine.  This command selects the virtual lonCAPA.  The client always
                   3979: #  knows the right one since it is lonc and it is selecting the domain/system
                   3980: #  from the hosts.tab file.
                   3981: # Parameters:
                   3982: #    $cmd      - Command that dispatched us.
                   3983: #    $tail     - Tail of the command (domain/host requested).
                   3984: #    $socket   - Socket open on the client.
                   3985: #
                   3986: # Returns:
                   3987: #     1   - Indicates the program should continue to process requests.
                   3988: # Side-effects:
                   3989: #     The default domain/system context is modified for this daemon.
                   3990: #     a reply is sent to the client.
                   3991: #
                   3992: sub set_virtual_host_handler {
                   3993:     my ($cmd, $tail, $socket) = @_;
                   3994:   
                   3995:     my $userinput  ="$cmd:$tail";
                   3996: 
                   3997:     &Reply($client, &sethost($userinput)."\n", $userinput);
                   3998: 
                   3999: 
                   4000:     return 1;
                   4001: }
1.247     albertel 4002: &register_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
1.246     foxr     4003: 
                   4004: #  Process a request to exit:
                   4005: #   - "bye" is sent to the client.
                   4006: #   - The client socket is shutdown and closed.
                   4007: #   - We indicate to the caller that we should exit.
                   4008: # Formal Parameters:
                   4009: #   $cmd                - The command that got us here.
                   4010: #   $tail               - Tail of the command (empty).
                   4011: #   $client             - Socket open on the tail.
                   4012: # Returns:
                   4013: #   0      - Indicating the program should exit!!
                   4014: #
                   4015: sub exit_handler {
                   4016:     my ($cmd, $tail, $client) = @_;
                   4017: 
                   4018:     my $userinput = "$cmd:$tail";
                   4019: 
                   4020:     &logthis("Client $clientip ($clientname) hanging up: $userinput");
                   4021:     &Reply($client, "bye\n", $userinput);
                   4022:     $client->shutdown(2);        # shutdown the socket forcibly.
                   4023:     $client->close();
                   4024: 
                   4025:     return 0;
                   4026: }
1.248     foxr     4027: &register_handler("exit", \&exit_handler, 0,1,1);
                   4028: &register_handler("init", \&exit_handler, 0,1,1);
                   4029: &register_handler("quit", \&exit_handler, 0,1,1);
                   4030: 
                   4031: #  Determine if auto-enrollment is enabled.
                   4032: #  Note that the original had what I believe to be a defect.
                   4033: #  The original returned 0 if the requestor was not a registerd client.
                   4034: #  It should return "refused".
                   4035: # Formal Parameters:
                   4036: #   $cmd       - The command that invoked us.
                   4037: #   $tail      - The tail of the command (Extra command parameters.
                   4038: #   $client    - The socket open on the client that issued the request.
                   4039: # Returns:
                   4040: #    1         - Indicating processing should continue.
                   4041: #
                   4042: sub enrollment_enabled_handler {
                   4043:     my ($cmd, $tail, $client) = @_;
                   4044:     my $userinput = $cmd.":".$tail; # For logging purposes.
                   4045: 
                   4046:     
                   4047:     my $cdom = split(/:/, $tail);   # Domain we're asking about.
                   4048:     my $outcome  = &localenroll::run($cdom);
                   4049:     &Reply($client, "$outcome\n", $userinput);
                   4050: 
                   4051:     return 1;
                   4052: }
                   4053: &register_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
                   4054: 
                   4055: #   Get the official sections for which auto-enrollment is possible.
                   4056: #   Since the admin people won't know about 'unofficial sections' 
                   4057: #   we cannot auto-enroll on them.
                   4058: # Formal Parameters:
                   4059: #    $cmd     - The command request that got us dispatched here.
                   4060: #    $tail    - The remainder of the request.  In our case this
                   4061: #               will be split into:
                   4062: #               $coursecode   - The course name from the admin point of view.
                   4063: #               $cdom         - The course's domain(?).
                   4064: #    $client  - Socket open on the client.
                   4065: # Returns:
                   4066: #    1    - Indiciting processing should continue.
                   4067: #
                   4068: sub get_sections_handler {
                   4069:     my ($cmd, $tail, $client) = @_;
                   4070:     my $userinput = "$cmd:$tail";
                   4071: 
                   4072:     my ($coursecode, $cdom) = split(/:/, $tail);
                   4073:     my @secs = &localenroll::get_sections($coursecode,$cdom);
                   4074:     my $seclist = &escape(join(':',@secs));
                   4075: 
                   4076:     &Reply($client, "$seclist\n", $userinput);
                   4077:     
                   4078: 
                   4079:     return 1;
                   4080: }
                   4081: &register_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
                   4082: 
                   4083: #   Validate the owner of a new course section.  
                   4084: #
                   4085: # Formal Parameters:
                   4086: #   $cmd      - Command that got us dispatched.
                   4087: #   $tail     - the remainder of the command.  For us this consists of a
                   4088: #               colon separated string containing:
                   4089: #                  $inst    - Course Id from the institutions point of view.
                   4090: #                  $owner   - Proposed owner of the course.
                   4091: #                  $cdom    - Domain of the course (from the institutions
                   4092: #                             point of view?)..
                   4093: #   $client   - Socket open on the client.
                   4094: #
                   4095: # Returns:
                   4096: #   1        - Processing should continue.
                   4097: #
                   4098: sub validate_course_owner_handler {
                   4099:     my ($cmd, $tail, $client)  = @_;
                   4100:     my $userinput = "$cmd:$tail";
                   4101:     my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
                   4102: 
                   4103:     my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
                   4104:     &Reply($client, "$outcome\n", $userinput);
                   4105: 
                   4106: 
                   4107: 
                   4108:     return 1;
                   4109: }
                   4110: &register_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
1.263     albertel 4111: 
1.248     foxr     4112: #
                   4113: #   Validate a course section in the official schedule of classes
                   4114: #   from the institutions point of view (part of autoenrollment).
                   4115: #
                   4116: # Formal Parameters:
                   4117: #   $cmd          - The command request that got us dispatched.
                   4118: #   $tail         - The tail of the command.  In this case,
                   4119: #                   this is a colon separated set of words that will be split
                   4120: #                   into:
                   4121: #                        $inst_course_id - The course/section id from the
                   4122: #                                          institutions point of view.
                   4123: #                        $cdom           - The domain from the institutions
                   4124: #                                          point of view.
                   4125: #   $client       - Socket open on the client.
                   4126: # Returns:
                   4127: #    1           - Indicating processing should continue.
                   4128: #
                   4129: sub validate_course_section_handler {
                   4130:     my ($cmd, $tail, $client) = @_;
                   4131:     my $userinput = "$cmd:$tail";
                   4132:     my ($inst_course_id, $cdom) = split(/:/, $tail);
                   4133: 
                   4134:     my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
                   4135:     &Reply($client, "$outcome\n", $userinput);
                   4136: 
                   4137: 
                   4138:     return 1;
                   4139: }
                   4140: &register_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
                   4141: 
                   4142: #
                   4143: #   Create a password for a new auto-enrollment user.
                   4144: #   I think/guess, this password allows access to the institutions 
                   4145: #   AIS class list server/services.  Stuart can correct this comment
                   4146: #   when he finds out how wrong I am.
                   4147: #
                   4148: # Formal Parameters:
                   4149: #    $cmd     - The command request that got us dispatched.
                   4150: #    $tail    - The tail of the command.   In this case this is a colon separated
                   4151: #               set of words that will be split into:
                   4152: #               $authparam - An authentication parameter (username??).
                   4153: #               $cdom      - The domain of the course from the institution's
                   4154: #                            point of view.
                   4155: #    $client  - The socket open on the client.
                   4156: # Returns:
                   4157: #    1 - continue processing.
                   4158: #
                   4159: sub create_auto_enroll_password_handler {
                   4160:     my ($cmd, $tail, $client) = @_;
                   4161:     my $userinput = "$cmd:$tail";
                   4162: 
                   4163:     my ($authparam, $cdom) = split(/:/, $userinput);
                   4164: 
                   4165:     my ($create_passwd,$authchk);
                   4166:     ($authparam,
                   4167:      $create_passwd,
                   4168:      $authchk) = &localenroll::create_password($authparam,$cdom);
                   4169: 
                   4170:     &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
                   4171: 	   $userinput);
                   4172: 
                   4173: 
                   4174:     return 1;
                   4175: }
                   4176: &register_handler("autocreatepassword", \&create_auto_enroll_password_handler, 
                   4177: 		  0, 1, 0);
                   4178: 
                   4179: #   Retrieve and remove temporary files created by/during autoenrollment.
                   4180: #
                   4181: # Formal Parameters:
                   4182: #    $cmd      - The command that got us dispatched.
                   4183: #    $tail     - The tail of the command.  In our case this is a colon 
                   4184: #                separated list that will be split into:
                   4185: #                $filename - The name of the file to remove.
                   4186: #                            The filename is given as a path relative to
                   4187: #                            the LonCAPA temp file directory.
                   4188: #    $client   - Socket open on the client.
                   4189: #
                   4190: # Returns:
                   4191: #   1     - Continue processing.
                   4192: sub retrieve_auto_file_handler {
                   4193:     my ($cmd, $tail, $client)    = @_;
                   4194:     my $userinput                = "cmd:$tail";
                   4195: 
                   4196:     my ($filename)   = split(/:/, $tail);
                   4197: 
                   4198:     my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
                   4199:     if ( (-e $source) && ($filename ne '') ) {
                   4200: 	my $reply = '';
                   4201: 	if (open(my $fh,$source)) {
                   4202: 	    while (<$fh>) {
                   4203: 		chomp($_);
                   4204: 		$_ =~ s/^\s+//g;
                   4205: 		$_ =~ s/\s+$//g;
                   4206: 		$reply .= $_;
                   4207: 	    }
                   4208: 	    close($fh);
                   4209: 	    &Reply($client, &escape($reply)."\n", $userinput);
                   4210: 
                   4211: #   Does this have to be uncommented??!?  (RF).
                   4212: #
                   4213: #                                unlink($source);
                   4214: 	} else {
                   4215: 	    &Failure($client, "error\n", $userinput);
                   4216: 	}
                   4217:     } else {
                   4218: 	&Failure($client, "error\n", $userinput);
                   4219:     }
                   4220:     
                   4221: 
                   4222:     return 1;
                   4223: }
                   4224: &register_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
                   4225: 
                   4226: #
                   4227: #   Read and retrieve institutional code format (for support form).
                   4228: # Formal Parameters:
                   4229: #    $cmd        - Command that dispatched us.
                   4230: #    $tail       - Tail of the command.  In this case it conatins 
                   4231: #                  the course domain and the coursename.
                   4232: #    $client     - Socket open on the client.
                   4233: # Returns:
                   4234: #    1     - Continue processing.
                   4235: #
                   4236: sub get_institutional_code_format_handler {
                   4237:     my ($cmd, $tail, $client)   = @_;
                   4238:     my $userinput               = "$cmd:$tail";
                   4239: 
                   4240:     my $reply;
                   4241:     my($cdom,$course) = split(/:/,$tail);
                   4242:     my @pairs = split/\&/,$course;
                   4243:     my %instcodes = ();
                   4244:     my %codes = ();
                   4245:     my @codetitles = ();
                   4246:     my %cat_titles = ();
                   4247:     my %cat_order = ();
                   4248:     foreach (@pairs) {
                   4249: 	my ($key,$value) = split/=/,$_;
                   4250: 	$instcodes{&unescape($key)} = &unescape($value);
                   4251:     }
                   4252:     my $formatreply = &localenroll::instcode_format($cdom,
                   4253: 						    \%instcodes,
                   4254: 						    \%codes,
                   4255: 						    \@codetitles,
                   4256: 						    \%cat_titles,
                   4257: 						    \%cat_order);
                   4258:     if ($formatreply eq 'ok') {
                   4259: 	my $codes_str = &hash2str(%codes);
                   4260: 	my $codetitles_str = &array2str(@codetitles);
                   4261: 	my $cat_titles_str = &hash2str(%cat_titles);
                   4262: 	my $cat_order_str = &hash2str(%cat_order);
                   4263: 	&Reply($client,
                   4264: 	       $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
                   4265: 	       .$cat_order_str."\n",
                   4266: 	       $userinput);
                   4267:     } else {
                   4268: 	# this else branch added by RF since if not ok, lonc will
                   4269: 	# hang waiting on reply until timeout.
                   4270: 	#
                   4271: 	&Reply($client, "format_error\n", $userinput);
                   4272:     }
                   4273:     
                   4274:     return 1;
                   4275: }
1.265     albertel 4276: &register_handler("autoinstcodeformat",
                   4277: 		  \&get_institutional_code_format_handler,0,1,0);
1.246     foxr     4278: 
1.317     raeburn  4279: # Get domain specific conditions for import of student photographs to a course
                   4280: #
                   4281: # Retrieves information from photo_permission subroutine in localenroll.
                   4282: # Returns outcome (ok) if no processing errors, and whether course owner is 
                   4283: # required to accept conditions of use (yes/no).
                   4284: #
                   4285: #    
                   4286: sub photo_permission_handler {
                   4287:     my ($cmd, $tail, $client)   = @_;
                   4288:     my $userinput               = "$cmd:$tail";
                   4289:     my $cdom = $tail;
                   4290:     my ($perm_reqd,$conditions);
1.320     albertel 4291:     my $outcome;
                   4292:     eval {
                   4293: 	local($SIG{__DIE__})='DEFAULT';
                   4294: 	$outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
                   4295: 						  \$conditions);
                   4296:     };
                   4297:     if (!$@) {
                   4298: 	&Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
                   4299: 	       $userinput);
                   4300:     } else {
                   4301: 	&Failure($client,"unknown_cmd\n",$userinput);
                   4302:     }
                   4303:     return 1;
1.317     raeburn  4304: }
                   4305: &register_handler("autophotopermission",\&photo_permission_handler,0,1,0);
                   4306: 
                   4307: #
                   4308: # Checks if student photo is available for a user in the domain, in the user's
                   4309: # directory (in /userfiles/internal/studentphoto.jpg).
                   4310: # Uses localstudentphoto:fetch() to ensure there is an up to date copy of
                   4311: # the student's photo.   
                   4312: 
                   4313: sub photo_check_handler {
                   4314:     my ($cmd, $tail, $client)   = @_;
                   4315:     my $userinput               = "$cmd:$tail";
                   4316:     my ($udom,$uname,$pid) = split(/:/,$tail);
                   4317:     $udom = &unescape($udom);
                   4318:     $uname = &unescape($uname);
                   4319:     $pid = &unescape($pid);
                   4320:     my $path=&propath($udom,$uname).'/userfiles/internal/';
                   4321:     if (!-e $path) {
                   4322:         &mkpath($path);
                   4323:     }
                   4324:     my $response;
                   4325:     my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
                   4326:     $result .= ':'.$response;
                   4327:     &Reply($client, &escape($result)."\n",$userinput);
1.320     albertel 4328:     return 1;
1.317     raeburn  4329: }
                   4330: &register_handler("autophotocheck",\&photo_check_handler,0,1,0);
                   4331: 
                   4332: #
                   4333: # Retrieve information from localenroll about whether to provide a button     
                   4334: # for users who have enbled import of student photos to initiate an 
                   4335: # update of photo files for registered students. Also include 
                   4336: # comment to display alongside button.  
                   4337: 
                   4338: sub photo_choice_handler {
                   4339:     my ($cmd, $tail, $client) = @_;
                   4340:     my $userinput             = "$cmd:$tail";
                   4341:     my $cdom                  = &unescape($tail);
1.320     albertel 4342:     my ($update,$comment);
                   4343:     eval {
                   4344: 	local($SIG{__DIE__})='DEFAULT';
                   4345: 	($update,$comment)    = &localenroll::manager_photo_update($cdom);
                   4346:     };
                   4347:     if (!$@) {
                   4348: 	&Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput);
                   4349:     } else {
                   4350: 	&Failure($client,"unknown_cmd\n",$userinput);
                   4351:     }
                   4352:     return 1;
1.317     raeburn  4353: }
                   4354: &register_handler("autophotochoice",\&photo_choice_handler,0,1,0);
                   4355: 
1.265     albertel 4356: #
                   4357: # Gets a student's photo to exist (in the correct image type) in the user's 
                   4358: # directory.
                   4359: # Formal Parameters:
                   4360: #    $cmd     - The command request that got us dispatched.
                   4361: #    $tail    - A colon separated set of words that will be split into:
                   4362: #               $domain - student's domain
                   4363: #               $uname  - student username
                   4364: #               $type   - image type desired
                   4365: #    $client  - The socket open on the client.
                   4366: # Returns:
                   4367: #    1 - continue processing.
1.317     raeburn  4368: 
1.265     albertel 4369: sub student_photo_handler {
                   4370:     my ($cmd, $tail, $client) = @_;
1.317     raeburn  4371:     my ($domain,$uname,$ext,$type) = split(/:/, $tail);
1.265     albertel 4372: 
1.317     raeburn  4373:     my $path=&propath($domain,$uname). '/userfiles/internal/';
                   4374:     my $filename = 'studentphoto.'.$ext;
                   4375:     if ($type eq 'thumbnail') {
                   4376:         $filename = 'studentphoto_tn.'.$ext;
                   4377:     }
                   4378:     if (-e $path.$filename) {
1.265     albertel 4379: 	&Reply($client,"ok\n","$cmd:$tail");
                   4380: 	return 1;
                   4381:     }
                   4382:     &mkpath($path);
1.317     raeburn  4383:     my $file;
                   4384:     if ($type eq 'thumbnail') {
1.320     albertel 4385: 	eval {
                   4386: 	    local($SIG{__DIE__})='DEFAULT';
                   4387: 	    $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
                   4388: 	};
1.317     raeburn  4389:     } else {
                   4390:         $file=&localstudentphoto::fetch($domain,$uname);
                   4391:     }
1.265     albertel 4392:     if (!$file) {
                   4393: 	&Failure($client,"unavailable\n","$cmd:$tail");
                   4394: 	return 1;
                   4395:     }
1.317     raeburn  4396:     if (!-e $path.$filename) { &convert_photo($file,$path.$filename); }
                   4397:     if (-e $path.$filename) {
1.265     albertel 4398: 	&Reply($client,"ok\n","$cmd:$tail");
                   4399: 	return 1;
                   4400:     }
                   4401:     &Failure($client,"unable_to_convert\n","$cmd:$tail");
                   4402:     return 1;
                   4403: }
                   4404: &register_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
1.246     foxr     4405: 
1.264     albertel 4406: # mkpath makes all directories for a file, expects an absolute path with a
                   4407: # file or a trailing / if just a dir is passed
                   4408: # returns 1 on success 0 on failure
                   4409: sub mkpath {
                   4410:     my ($file)=@_;
                   4411:     my @parts=split(/\//,$file,-1);
                   4412:     my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
                   4413:     for (my $i=3;$i<= ($#parts-1);$i++) {
1.265     albertel 4414: 	$now.='/'.$parts[$i]; 
1.264     albertel 4415: 	if (!-e $now) {
                   4416: 	    if  (!mkdir($now,0770)) { return 0; }
                   4417: 	}
                   4418:     }
                   4419:     return 1;
                   4420: }
                   4421: 
1.207     foxr     4422: #---------------------------------------------------------------
                   4423: #
                   4424: #   Getting, decoding and dispatching requests:
                   4425: #
                   4426: #
                   4427: #   Get a Request:
                   4428: #   Gets a Request message from the client.  The transaction
                   4429: #   is defined as a 'line' of text.  We remove the new line
                   4430: #   from the text line.  
1.226     foxr     4431: #
1.211     albertel 4432: sub get_request {
1.207     foxr     4433:     my $input = <$client>;
                   4434:     chomp($input);
1.226     foxr     4435: 
1.234     foxr     4436:     &Debug("get_request: Request = $input\n");
1.207     foxr     4437: 
                   4438:     &status('Processing '.$clientname.':'.$input);
                   4439: 
                   4440:     return $input;
                   4441: }
1.212     foxr     4442: #---------------------------------------------------------------
                   4443: #
                   4444: #  Process a request.  This sub should shrink as each action
                   4445: #  gets farmed out into a separat sub that is registered 
                   4446: #  with the dispatch hash.  
                   4447: #
                   4448: # Parameters:
                   4449: #    user_input   - The request received from the client (lonc).
                   4450: # Returns:
                   4451: #    true to keep processing, false if caller should exit.
                   4452: #
                   4453: sub process_request {
                   4454:     my ($userinput) = @_;      # Easier for now to break style than to
                   4455:                                 # fix all the userinput -> user_input.
                   4456:     my $wasenc    = 0;		# True if request was encrypted.
                   4457: # ------------------------------------------------------------ See if encrypted
1.322     albertel 4458:     # for command
                   4459:     # sethost:<server>
                   4460:     # <command>:<args>
                   4461:     #   we just send it to the processor
                   4462:     # for
                   4463:     # sethost:<server>:<command>:<args>
                   4464:     #  we do the implict set host and then do the command
                   4465:     if ($userinput =~ /^sethost:/) {
                   4466: 	(my $cmd,my $newid,$userinput) = split(':',$userinput,3);
                   4467: 	if (defined($userinput)) {
                   4468: 	    &sethost("$cmd:$newid");
                   4469: 	} else {
                   4470: 	    $userinput = "$cmd:$newid";
                   4471: 	}
                   4472:     }
                   4473: 
1.212     foxr     4474:     if ($userinput =~ /^enc/) {
                   4475: 	$userinput = decipher($userinput);
                   4476: 	$wasenc=1;
                   4477: 	if(!$userinput) {	# Cipher not defined.
1.251     foxr     4478: 	    &Failure($client, "error: Encrypted data without negotated key\n");
1.212     foxr     4479: 	    return 0;
                   4480: 	}
                   4481:     }
                   4482:     Debug("process_request: $userinput\n");
                   4483:     
1.213     foxr     4484:     #  
                   4485:     #   The 'correct way' to add a command to lond is now to
                   4486:     #   write a sub to execute it and Add it to the command dispatch
                   4487:     #   hash via a call to register_handler..  The comments to that
                   4488:     #   sub should give you enough to go on to show how to do this
                   4489:     #   along with the examples that are building up as this code
                   4490:     #   is getting refactored.   Until all branches of the
                   4491:     #   if/elseif monster below have been factored out into
                   4492:     #   separate procesor subs, if the dispatch hash is missing
                   4493:     #   the command keyword, we will fall through to the remainder
                   4494:     #   of the if/else chain below in order to keep this thing in 
                   4495:     #   working order throughout the transmogrification.
                   4496: 
                   4497:     my ($command, $tail) = split(/:/, $userinput, 2);
                   4498:     chomp($command);
                   4499:     chomp($tail);
                   4500:     $tail =~ s/(\r)//;		# This helps people debugging with e.g. telnet.
1.214     foxr     4501:     $command =~ s/(\r)//;	# And this too for parameterless commands.
                   4502:     if(!$tail) {
                   4503: 	$tail ="";		# defined but blank.
                   4504:     }
1.213     foxr     4505: 
                   4506:     &Debug("Command received: $command, encoded = $wasenc");
                   4507: 
                   4508:     if(defined $Dispatcher{$command}) {
                   4509: 
                   4510: 	my $dispatch_info = $Dispatcher{$command};
                   4511: 	my $handler       = $$dispatch_info[0];
                   4512: 	my $need_encode   = $$dispatch_info[1];
                   4513: 	my $client_types  = $$dispatch_info[2];
                   4514: 	Debug("Matched dispatch hash: mustencode: $need_encode "
                   4515: 	      ."ClientType $client_types");
                   4516:       
                   4517: 	#  Validate the request:
                   4518:       
                   4519: 	my $ok = 1;
                   4520: 	my $requesterprivs = 0;
                   4521: 	if(&isClient()) {
                   4522: 	    $requesterprivs |= $CLIENT_OK;
                   4523: 	}
                   4524: 	if(&isManager()) {
                   4525: 	    $requesterprivs |= $MANAGER_OK;
                   4526: 	}
                   4527: 	if($need_encode && (!$wasenc)) {
                   4528: 	    Debug("Must encode but wasn't: $need_encode $wasenc");
                   4529: 	    $ok = 0;
                   4530: 	}
                   4531: 	if(($client_types & $requesterprivs) == 0) {
                   4532: 	    Debug("Client not privileged to do this operation");
                   4533: 	    $ok = 0;
                   4534: 	}
                   4535: 
                   4536: 	if($ok) {
                   4537: 	    Debug("Dispatching to handler $command $tail");
                   4538: 	    my $keep_going = &$handler($command, $tail, $client);
                   4539: 	    return $keep_going;
                   4540: 	} else {
                   4541: 	    Debug("Refusing to dispatch because client did not match requirements");
                   4542: 	    Failure($client, "refused\n", $userinput);
                   4543: 	    return 1;
                   4544: 	}
                   4545: 
                   4546:     }    
                   4547: 
1.262     foxr     4548:     print $client "unknown_cmd\n";
1.212     foxr     4549: # -------------------------------------------------------------------- complete
                   4550:     Debug("process_request - returning 1");
                   4551:     return 1;
                   4552: }
1.207     foxr     4553: #
                   4554: #   Decipher encoded traffic
                   4555: #  Parameters:
                   4556: #     input      - Encoded data.
                   4557: #  Returns:
                   4558: #     Decoded data or undef if encryption key was not yet negotiated.
                   4559: #  Implicit input:
                   4560: #     cipher  - This global holds the negotiated encryption key.
                   4561: #
1.211     albertel 4562: sub decipher {
1.207     foxr     4563:     my ($input)  = @_;
                   4564:     my $output = '';
1.212     foxr     4565:     
                   4566:     
1.207     foxr     4567:     if($cipher) {
                   4568: 	my($enc, $enclength, $encinput) = split(/:/, $input);
                   4569: 	for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
                   4570: 	    $output .= 
                   4571: 		$cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
                   4572: 	}
                   4573: 	return substr($output, 0, $enclength);
                   4574:     } else {
                   4575: 	return undef;
                   4576:     }
                   4577: }
                   4578: 
                   4579: #
                   4580: #   Register a command processor.  This function is invoked to register a sub
                   4581: #   to process a request.  Once registered, the ProcessRequest sub can automatically
                   4582: #   dispatch requests to an appropriate sub, and do the top level validity checking
                   4583: #   as well:
                   4584: #    - Is the keyword recognized.
                   4585: #    - Is the proper client type attempting the request.
                   4586: #    - Is the request encrypted if it has to be.
                   4587: #   Parameters:
                   4588: #    $request_name         - Name of the request being registered.
                   4589: #                           This is the command request that will match
                   4590: #                           against the hash keywords to lookup the information
                   4591: #                           associated with the dispatch information.
                   4592: #    $procedure           - Reference to a sub to call to process the request.
                   4593: #                           All subs get called as follows:
                   4594: #                             Procedure($cmd, $tail, $replyfd, $key)
                   4595: #                             $cmd    - the actual keyword that invoked us.
                   4596: #                             $tail   - the tail of the request that invoked us.
                   4597: #                             $replyfd- File descriptor connected to the client
                   4598: #    $must_encode          - True if the request must be encoded to be good.
                   4599: #    $client_ok            - True if it's ok for a client to request this.
                   4600: #    $manager_ok           - True if it's ok for a manager to request this.
                   4601: # Side effects:
                   4602: #      - On success, the Dispatcher hash has an entry added for the key $RequestName
                   4603: #      - On failure, the program will die as it's a bad internal bug to try to 
                   4604: #        register a duplicate command handler.
                   4605: #
1.211     albertel 4606: sub register_handler {
1.212     foxr     4607:     my ($request_name,$procedure,$must_encode,	$client_ok,$manager_ok)   = @_;
1.207     foxr     4608: 
                   4609:     #  Don't allow duplication#
                   4610:    
                   4611:     if (defined $Dispatcher{$request_name}) {
                   4612: 	die "Attempting to define a duplicate request handler for $request_name\n";
                   4613:     }
                   4614:     #   Build the client type mask:
                   4615:     
                   4616:     my $client_type_mask = 0;
                   4617:     if($client_ok) {
                   4618: 	$client_type_mask  |= $CLIENT_OK;
                   4619:     }
                   4620:     if($manager_ok) {
                   4621: 	$client_type_mask  |= $MANAGER_OK;
                   4622:     }
                   4623:    
                   4624:     #  Enter the hash:
                   4625:       
                   4626:     my @entry = ($procedure, $must_encode, $client_type_mask);
                   4627:    
                   4628:     $Dispatcher{$request_name} = \@entry;
                   4629:    
                   4630: }
                   4631: 
                   4632: 
                   4633: #------------------------------------------------------------------
                   4634: 
                   4635: 
                   4636: 
                   4637: 
1.141     foxr     4638: #
1.96      foxr     4639: #  Convert an error return code from lcpasswd to a string value.
                   4640: #
                   4641: sub lcpasswdstrerror {
                   4642:     my $ErrorCode = shift;
1.97      foxr     4643:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96      foxr     4644: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
                   4645:     } else {
1.98      foxr     4646: 	return $passwderrors[$ErrorCode];
1.96      foxr     4647:     }
                   4648: }
                   4649: 
1.97      foxr     4650: #
                   4651: # Convert an error return code from lcuseradd to a string value:
                   4652: #
                   4653: sub lcuseraddstrerror {
                   4654:     my $ErrorCode = shift;
                   4655:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
                   4656: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
                   4657:     } else {
1.98      foxr     4658: 	return $adderrors[$ErrorCode];
1.97      foxr     4659:     }
                   4660: }
                   4661: 
1.23      harris41 4662: # grabs exception and records it to log before exiting
                   4663: sub catchexception {
1.27      albertel 4664:     my ($error)=@_;
1.25      www      4665:     $SIG{'QUIT'}='DEFAULT';
                   4666:     $SIG{__DIE__}='DEFAULT';
1.165     albertel 4667:     &status("Catching exception");
1.190     albertel 4668:     &logthis("<font color='red'>CRITICAL: "
1.134     albertel 4669:      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
1.27      albertel 4670:      ."a crash with this error msg->[$error]</font>");
1.57      www      4671:     &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27      albertel 4672:     if ($client) { print $client "error: $error\n"; }
1.59      www      4673:     $server->close();
1.27      albertel 4674:     die($error);
1.23      harris41 4675: }
1.63      www      4676: sub timeout {
1.165     albertel 4677:     &status("Handling Timeout");
1.190     albertel 4678:     &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
1.63      www      4679:     &catchexception('Timeout');
                   4680: }
1.22      harris41 4681: # -------------------------------- Set signal handlers to record abnormal exits
                   4682: 
1.226     foxr     4683: 
1.22      harris41 4684: $SIG{'QUIT'}=\&catchexception;
                   4685: $SIG{__DIE__}=\&catchexception;
                   4686: 
1.81      matthew  4687: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95      harris41 4688: &status("Read loncapa.conf and loncapa_apache.conf");
                   4689: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141     foxr     4690: %perlvar=%{$perlvarref};
1.80      harris41 4691: undef $perlvarref;
1.19      www      4692: 
1.35      harris41 4693: # ----------------------------- Make sure this process is running from user=www
                   4694: my $wwwid=getpwnam('www');
                   4695: if ($wwwid!=$<) {
1.134     albertel 4696:    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   4697:    my $subj="LON: $currenthostid User ID mismatch";
1.37      harris41 4698:    system("echo 'User ID mismatch.  lond must be run as user www.' |\
1.35      harris41 4699:  mailto $emailto -s '$subj' > /dev/null");
                   4700:    exit 1;
                   4701: }
                   4702: 
1.19      www      4703: # --------------------------------------------- Check if other instance running
                   4704: 
                   4705: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
                   4706: 
                   4707: if (-e $pidfile) {
                   4708:    my $lfh=IO::File->new("$pidfile");
                   4709:    my $pide=<$lfh>;
                   4710:    chomp($pide);
1.29      harris41 4711:    if (kill 0 => $pide) { die "already running"; }
1.19      www      4712: }
1.1       albertel 4713: 
                   4714: # ------------------------------------------------------------- Read hosts file
                   4715: 
                   4716: 
                   4717: 
                   4718: # establish SERVER socket, bind and listen.
                   4719: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                   4720:                                 Type      => SOCK_STREAM,
                   4721:                                 Proto     => 'tcp',
                   4722:                                 Reuse     => 1,
                   4723:                                 Listen    => 10 )
1.29      harris41 4724:   or die "making socket: $@\n";
1.1       albertel 4725: 
                   4726: # --------------------------------------------------------- Do global variables
                   4727: 
                   4728: # global variables
                   4729: 
1.134     albertel 4730: my %children               = ();       # keys are current child process IDs
1.1       albertel 4731: 
                   4732: sub REAPER {                        # takes care of dead children
                   4733:     $SIG{CHLD} = \&REAPER;
1.165     albertel 4734:     &status("Handling child death");
1.178     foxr     4735:     my $pid;
                   4736:     do {
                   4737: 	$pid = waitpid(-1,&WNOHANG());
                   4738: 	if (defined($children{$pid})) {
                   4739: 	    &logthis("Child $pid died");
                   4740: 	    delete($children{$pid});
1.183     albertel 4741: 	} elsif ($pid > 0) {
1.178     foxr     4742: 	    &logthis("Unknown Child $pid died");
                   4743: 	}
                   4744:     } while ( $pid > 0 );
                   4745:     foreach my $child (keys(%children)) {
                   4746: 	$pid = waitpid($child,&WNOHANG());
                   4747: 	if ($pid > 0) {
                   4748: 	    &logthis("Child $child - $pid looks like we missed it's death");
                   4749: 	    delete($children{$pid});
                   4750: 	}
1.176     albertel 4751:     }
1.165     albertel 4752:     &status("Finished Handling child death");
1.1       albertel 4753: }
                   4754: 
                   4755: sub HUNTSMAN {                      # signal handler for SIGINT
1.165     albertel 4756:     &status("Killing children (INT)");
1.1       albertel 4757:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                   4758:     kill 'INT' => keys %children;
1.59      www      4759:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1       albertel 4760:     my $execdir=$perlvar{'lonDaemons'};
                   4761:     unlink("$execdir/logs/lond.pid");
1.190     albertel 4762:     &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.165     albertel 4763:     &status("Done killing children");
1.1       albertel 4764:     exit;                           # clean up with dignity
                   4765: }
                   4766: 
                   4767: sub HUPSMAN {                      # signal handler for SIGHUP
                   4768:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
1.165     albertel 4769:     &status("Killing children for restart (HUP)");
1.1       albertel 4770:     kill 'INT' => keys %children;
1.59      www      4771:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.190     albertel 4772:     &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.134     albertel 4773:     my $execdir=$perlvar{'lonDaemons'};
1.30      harris41 4774:     unlink("$execdir/logs/lond.pid");
1.165     albertel 4775:     &status("Restarting self (HUP)");
1.1       albertel 4776:     exec("$execdir/lond");         # here we go again
                   4777: }
                   4778: 
1.144     foxr     4779: #
1.148     foxr     4780: #    Kill off hashes that describe the host table prior to re-reading it.
                   4781: #    Hashes affected are:
1.200     matthew  4782: #       %hostid, %hostdom %hostip %hostdns.
1.148     foxr     4783: #
                   4784: sub KillHostHashes {
                   4785:     foreach my $key (keys %hostid) {
                   4786: 	delete $hostid{$key};
                   4787:     }
                   4788:     foreach my $key (keys %hostdom) {
                   4789: 	delete $hostdom{$key};
                   4790:     }
                   4791:     foreach my $key (keys %hostip) {
                   4792: 	delete $hostip{$key};
                   4793:     }
1.200     matthew  4794:     foreach my $key (keys %hostdns) {
                   4795: 	delete $hostdns{$key};
                   4796:     }
1.148     foxr     4797: }
                   4798: #
                   4799: #   Read in the host table from file and distribute it into the various hashes:
                   4800: #
                   4801: #    - %hostid  -  Indexed by IP, the loncapa hostname.
                   4802: #    - %hostdom -  Indexed by  loncapa hostname, the domain.
                   4803: #    - %hostip  -  Indexed by hostid, the Ip address of the host.
                   4804: sub ReadHostTable {
                   4805: 
                   4806:     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
1.200     matthew  4807:     my $myloncapaname = $perlvar{'lonHostID'};
                   4808:     Debug("My loncapa name is : $myloncapaname");
1.296     albertel 4809:     my %name_to_ip;
1.148     foxr     4810:     while (my $configline=<CONFIG>) {
1.277     albertel 4811: 	if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
                   4812: 	    my ($id,$domain,$role,$name)=split(/:/,$configline);
                   4813: 	    $name=~s/\s//g;
1.296     albertel 4814: 	    my $ip;
                   4815: 	    if (!exists($name_to_ip{$name})) {
                   4816: 		$ip = gethostbyname($name);
                   4817: 		if (!$ip || length($ip) ne 4) {
                   4818: 		    &logthis("Skipping host $id name $name no IP found\n");
                   4819: 		    next;
                   4820: 		}
                   4821: 		$ip=inet_ntoa($ip);
                   4822: 		$name_to_ip{$name} = $ip;
                   4823: 	    } else {
                   4824: 		$ip = $name_to_ip{$name};
1.277     albertel 4825: 	    }
1.200     matthew  4826: 	    $hostid{$ip}=$id;         # LonCAPA name of host by IP.
                   4827: 	    $hostdom{$id}=$domain;    # LonCAPA domain name of host. 
1.307     albertel 4828: 	    $hostname{$id}=$name;     # LonCAPA name -> DNS name
1.277     albertel 4829: 	    $hostip{$id}=$ip;         # IP address of host.
1.200     matthew  4830: 	    $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
                   4831: 
                   4832: 	    if ($id eq $perlvar{'lonHostID'}) { 
                   4833: 		Debug("Found me in the host table: $name");
                   4834: 		$thisserver=$name; 
                   4835: 	    }
1.178     foxr     4836: 	}
1.148     foxr     4837:     }
                   4838:     close(CONFIG);
                   4839: }
                   4840: #
                   4841: #  Reload the Apache daemon's state.
1.150     foxr     4842: #  This is done by invoking /home/httpd/perl/apachereload
                   4843: #  a setuid perl script that can be root for us to do this job.
1.148     foxr     4844: #
                   4845: sub ReloadApache {
1.150     foxr     4846:     my $execdir = $perlvar{'lonDaemons'};
                   4847:     my $script  = $execdir."/apachereload";
                   4848:     system($script);
1.148     foxr     4849: }
                   4850: 
                   4851: #
1.144     foxr     4852: #   Called in response to a USR2 signal.
                   4853: #   - Reread hosts.tab
                   4854: #   - All children connected to hosts that were removed from hosts.tab
                   4855: #     are killed via SIGINT
                   4856: #   - All children connected to previously existing hosts are sent SIGUSR1
                   4857: #   - Our internal hosts hash is updated to reflect the new contents of
                   4858: #     hosts.tab causing connections from hosts added to hosts.tab to
                   4859: #     now be honored.
                   4860: #
                   4861: sub UpdateHosts {
1.165     albertel 4862:     &status("Reload hosts.tab");
1.147     foxr     4863:     logthis('<font color="blue"> Updating connections </font>');
1.148     foxr     4864:     #
                   4865:     #  The %children hash has the set of IP's we currently have children
                   4866:     #  on.  These need to be matched against records in the hosts.tab
                   4867:     #  Any ip's no longer in the table get killed off they correspond to
                   4868:     #  either dropped or changed hosts.  Note that the re-read of the table
                   4869:     #  will take care of new and changed hosts as connections come into being.
                   4870: 
                   4871: 
                   4872:     KillHostHashes;
                   4873:     ReadHostTable;
                   4874: 
                   4875:     foreach my $child (keys %children) {
                   4876: 	my $childip = $children{$child};
                   4877: 	if(!$hostid{$childip}) {
1.149     foxr     4878: 	    logthis('<font color="blue"> UpdateHosts killing child '
                   4879: 		    ." $child for ip $childip </font>");
1.148     foxr     4880: 	    kill('INT', $child);
1.149     foxr     4881: 	} else {
                   4882: 	    logthis('<font color="green"> keeping child for ip '
                   4883: 		    ." $childip (pid=$child) </font>");
1.148     foxr     4884: 	}
                   4885:     }
                   4886:     ReloadApache;
1.165     albertel 4887:     &status("Finished reloading hosts.tab");
1.144     foxr     4888: }
                   4889: 
1.148     foxr     4890: 
1.57      www      4891: sub checkchildren {
1.165     albertel 4892:     &status("Checking on the children (sending signals)");
1.57      www      4893:     &initnewstatus();
                   4894:     &logstatus();
                   4895:     &logthis('Going to check on the children');
1.134     albertel 4896:     my $docdir=$perlvar{'lonDocRoot'};
1.61      harris41 4897:     foreach (sort keys %children) {
1.221     albertel 4898: 	#sleep 1;
1.57      www      4899:         unless (kill 'USR1' => $_) {
                   4900: 	    &logthis ('Child '.$_.' is dead');
                   4901:             &logstatus($$.' is dead');
1.221     albertel 4902: 	    delete($children{$_});
1.57      www      4903:         } 
1.61      harris41 4904:     }
1.63      www      4905:     sleep 5;
1.212     foxr     4906:     $SIG{ALRM} = sub { Debug("timeout"); 
                   4907: 		       die "timeout";  };
1.113     albertel 4908:     $SIG{__DIE__} = 'DEFAULT';
1.165     albertel 4909:     &status("Checking on the children (waiting for reports)");
1.63      www      4910:     foreach (sort keys %children) {
                   4911:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.113     albertel 4912:           eval {
                   4913:             alarm(300);
1.63      www      4914: 	    &logthis('Child '.$_.' did not respond');
1.67      albertel 4915: 	    kill 9 => $_;
1.131     albertel 4916: 	    #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   4917: 	    #$subj="LON: $currenthostid killed lond process $_";
                   4918: 	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
                   4919: 	    #$execdir=$perlvar{'lonDaemons'};
                   4920: 	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
1.221     albertel 4921: 	    delete($children{$_});
1.113     albertel 4922: 	    alarm(0);
                   4923: 	  }
1.63      www      4924:         }
                   4925:     }
1.113     albertel 4926:     $SIG{ALRM} = 'DEFAULT';
1.155     albertel 4927:     $SIG{__DIE__} = \&catchexception;
1.165     albertel 4928:     &status("Finished checking children");
1.221     albertel 4929:     &logthis('Finished Checking children');
1.57      www      4930: }
                   4931: 
1.1       albertel 4932: # --------------------------------------------------------------------- Logging
                   4933: 
                   4934: sub logthis {
                   4935:     my $message=shift;
                   4936:     my $execdir=$perlvar{'lonDaemons'};
                   4937:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
                   4938:     my $now=time;
                   4939:     my $local=localtime($now);
1.58      www      4940:     $lastlog=$local.': '.$message;
1.1       albertel 4941:     print $fh "$local ($$): $message\n";
                   4942: }
                   4943: 
1.77      foxr     4944: # ------------------------- Conditional log if $DEBUG true.
                   4945: sub Debug {
                   4946:     my $message = shift;
                   4947:     if($DEBUG) {
                   4948: 	&logthis($message);
                   4949:     }
                   4950: }
1.161     foxr     4951: 
                   4952: #
                   4953: #   Sub to do replies to client.. this gives a hook for some
                   4954: #   debug tracing too:
                   4955: #  Parameters:
                   4956: #     fd      - File open on client.
                   4957: #     reply   - Text to send to client.
                   4958: #     request - Original request from client.
                   4959: #
                   4960: sub Reply {
1.192     foxr     4961:     my ($fd, $reply, $request) = @_;
1.161     foxr     4962:     print $fd $reply;
                   4963:     Debug("Request was $request  Reply was $reply");
                   4964: 
1.212     foxr     4965:     $Transactions++;
                   4966: }
                   4967: 
                   4968: 
                   4969: #
                   4970: #    Sub to report a failure.
                   4971: #    This function:
                   4972: #     -   Increments the failure statistic counters.
                   4973: #     -   Invokes Reply to send the error message to the client.
                   4974: # Parameters:
                   4975: #    fd       - File descriptor open on the client
                   4976: #    reply    - Reply text to emit.
                   4977: #    request  - The original request message (used by Reply
                   4978: #               to debug if that's enabled.
                   4979: # Implicit outputs:
                   4980: #    $Failures- The number of failures is incremented.
                   4981: #    Reply (invoked here) sends a message to the 
                   4982: #    client:
                   4983: #
                   4984: sub Failure {
                   4985:     my $fd      = shift;
                   4986:     my $reply   = shift;
                   4987:     my $request = shift;
                   4988:    
                   4989:     $Failures++;
                   4990:     Reply($fd, $reply, $request);      # That's simple eh?
1.161     foxr     4991: }
1.57      www      4992: # ------------------------------------------------------------------ Log status
                   4993: 
                   4994: sub logstatus {
1.178     foxr     4995:     &status("Doing logging");
                   4996:     my $docdir=$perlvar{'lonDocRoot'};
                   4997:     {
                   4998: 	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
1.200     matthew  4999:         print $fh $status."\n".$lastlog."\n".time."\n$keymode";
1.178     foxr     5000:         $fh->close();
                   5001:     }
1.221     albertel 5002:     &status("Finished $$.txt");
                   5003:     {
                   5004: 	open(LOG,">>$docdir/lon-status/londstatus.txt");
                   5005: 	flock(LOG,LOCK_EX);
                   5006: 	print LOG $$."\t".$clientname."\t".$currenthostid."\t"
                   5007: 	    .$status."\t".$lastlog."\t $keymode\n";
1.275     albertel 5008: 	flock(LOG,LOCK_UN);
1.221     albertel 5009: 	close(LOG);
                   5010:     }
1.178     foxr     5011:     &status("Finished logging");
1.57      www      5012: }
                   5013: 
                   5014: sub initnewstatus {
                   5015:     my $docdir=$perlvar{'lonDocRoot'};
                   5016:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
                   5017:     my $now=time;
                   5018:     my $local=localtime($now);
                   5019:     print $fh "LOND status $local - parent $$\n\n";
1.64      www      5020:     opendir(DIR,"$docdir/lon-status/londchld");
1.134     albertel 5021:     while (my $filename=readdir(DIR)) {
1.64      www      5022:         unlink("$docdir/lon-status/londchld/$filename");
                   5023:     }
                   5024:     closedir(DIR);
1.57      www      5025: }
                   5026: 
                   5027: # -------------------------------------------------------------- Status setting
                   5028: 
                   5029: sub status {
                   5030:     my $what=shift;
                   5031:     my $now=time;
                   5032:     my $local=localtime($now);
1.178     foxr     5033:     $status=$local.': '.$what;
                   5034:     $0='lond: '.$what.' '.$local;
1.57      www      5035: }
1.11      www      5036: 
1.1       albertel 5037: # ----------------------------------------------------------- Send USR1 to lonc
                   5038: 
                   5039: sub reconlonc {
                   5040:     my $peerfile=shift;
                   5041:     &logthis("Trying to reconnect for $peerfile");
                   5042:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
                   5043:     if (my $fh=IO::File->new("$loncfile")) {
                   5044: 	my $loncpid=<$fh>;
                   5045:         chomp($loncpid);
                   5046:         if (kill 0 => $loncpid) {
                   5047: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
                   5048:             kill USR1 => $loncpid;
                   5049:         } else {
1.9       www      5050: 	    &logthis(
1.190     albertel 5051:               "<font color='red'>CRITICAL: "
1.9       www      5052:              ."lonc at pid $loncpid not responding, giving up</font>");
1.1       albertel 5053:         }
                   5054:     } else {
1.190     albertel 5055:       &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
1.1       albertel 5056:     }
                   5057: }
                   5058: 
                   5059: # -------------------------------------------------- Non-critical communication
1.11      www      5060: 
1.1       albertel 5061: sub subreply {
                   5062:     my ($cmd,$server)=@_;
1.307     albertel 5063:     my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};
1.1       albertel 5064:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   5065:                                       Type    => SOCK_STREAM,
                   5066:                                       Timeout => 10)
                   5067:        or return "con_lost";
1.307     albertel 5068:     print $sclient "sethost:$server:$cmd\n";
1.1       albertel 5069:     my $answer=<$sclient>;
                   5070:     chomp($answer);
                   5071:     if (!$answer) { $answer="con_lost"; }
                   5072:     return $answer;
                   5073: }
                   5074: 
                   5075: sub reply {
                   5076:   my ($cmd,$server)=@_;
                   5077:   my $answer;
1.115     albertel 5078:   if ($server ne $currenthostid) { 
1.1       albertel 5079:     $answer=subreply($cmd,$server);
                   5080:     if ($answer eq 'con_lost') {
                   5081: 	$answer=subreply("ping",$server);
                   5082:         if ($answer ne $server) {
1.115     albertel 5083: 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
1.307     albertel 5084:            &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$server});
1.1       albertel 5085:         }
                   5086:         $answer=subreply($cmd,$server);
                   5087:     }
                   5088:   } else {
                   5089:     $answer='self_reply';
                   5090:   } 
                   5091:   return $answer;
                   5092: }
                   5093: 
1.13      www      5094: # -------------------------------------------------------------- Talk to lonsql
                   5095: 
1.234     foxr     5096: sub sql_reply {
1.12      harris41 5097:     my ($cmd)=@_;
1.234     foxr     5098:     my $answer=&sub_sql_reply($cmd);
                   5099:     if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
1.12      harris41 5100:     return $answer;
                   5101: }
                   5102: 
1.234     foxr     5103: sub sub_sql_reply {
1.12      harris41 5104:     my ($cmd)=@_;
                   5105:     my $unixsock="mysqlsock";
                   5106:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
                   5107:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   5108:                                       Type    => SOCK_STREAM,
                   5109:                                       Timeout => 10)
                   5110:        or return "con_lost";
1.319     www      5111:     print $sclient "$cmd:$currentdomainid\n";
1.12      harris41 5112:     my $answer=<$sclient>;
                   5113:     chomp($answer);
                   5114:     if (!$answer) { $answer="con_lost"; }
                   5115:     return $answer;
                   5116: }
                   5117: 
1.1       albertel 5118: # --------------------------------------- Is this the home server of an author?
1.11      www      5119: 
1.1       albertel 5120: sub ishome {
                   5121:     my $author=shift;
                   5122:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                   5123:     my ($udom,$uname)=split(/\//,$author);
                   5124:     my $proname=propath($udom,$uname);
                   5125:     if (-e $proname) {
                   5126: 	return 'owner';
                   5127:     } else {
                   5128:         return 'not_owner';
                   5129:     }
                   5130: }
                   5131: 
                   5132: # ======================================================= Continue main program
                   5133: # ---------------------------------------------------- Fork once and dissociate
                   5134: 
1.134     albertel 5135: my $fpid=fork;
1.1       albertel 5136: exit if $fpid;
1.29      harris41 5137: die "Couldn't fork: $!" unless defined ($fpid);
1.1       albertel 5138: 
1.29      harris41 5139: POSIX::setsid() or die "Can't start new session: $!";
1.1       albertel 5140: 
                   5141: # ------------------------------------------------------- Write our PID on disk
                   5142: 
1.134     albertel 5143: my $execdir=$perlvar{'lonDaemons'};
1.1       albertel 5144: open (PIDSAVE,">$execdir/logs/lond.pid");
                   5145: print PIDSAVE "$$\n";
                   5146: close(PIDSAVE);
1.190     albertel 5147: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.57      www      5148: &status('Starting');
1.1       albertel 5149: 
1.106     foxr     5150: 
1.1       albertel 5151: 
                   5152: # ----------------------------------------------------- Install signal handlers
                   5153: 
1.57      www      5154: 
1.1       albertel 5155: $SIG{CHLD} = \&REAPER;
                   5156: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   5157: $SIG{HUP}  = \&HUPSMAN;
1.57      www      5158: $SIG{USR1} = \&checkchildren;
1.144     foxr     5159: $SIG{USR2} = \&UpdateHosts;
1.106     foxr     5160: 
1.148     foxr     5161: #  Read the host hashes:
                   5162: 
                   5163: ReadHostTable;
1.106     foxr     5164: 
1.286     albertel 5165: my $dist=`$perlvar{'lonDaemons'}/distprobe`;
                   5166: 
1.106     foxr     5167: # --------------------------------------------------------------
                   5168: #   Accept connections.  When a connection comes in, it is validated
                   5169: #   and if good, a child process is created to process transactions
                   5170: #   along the connection.
                   5171: 
1.1       albertel 5172: while (1) {
1.165     albertel 5173:     &status('Starting accept');
1.106     foxr     5174:     $client = $server->accept() or next;
1.165     albertel 5175:     &status('Accepted '.$client.' off to spawn');
1.106     foxr     5176:     make_new_child($client);
1.165     albertel 5177:     &status('Finished spawning');
1.1       albertel 5178: }
                   5179: 
1.212     foxr     5180: sub make_new_child {
                   5181:     my $pid;
                   5182: #    my $cipher;     # Now global
                   5183:     my $sigset;
1.178     foxr     5184: 
1.212     foxr     5185:     $client = shift;
                   5186:     &status('Starting new child '.$client);
                   5187:     &logthis('<font color="green"> Attempting to start child ('.$client.
                   5188: 	     ")</font>");    
                   5189:     # block signal for fork
                   5190:     $sigset = POSIX::SigSet->new(SIGINT);
                   5191:     sigprocmask(SIG_BLOCK, $sigset)
                   5192:         or die "Can't block SIGINT for fork: $!\n";
1.178     foxr     5193: 
1.212     foxr     5194:     die "fork: $!" unless defined ($pid = fork);
1.178     foxr     5195: 
1.212     foxr     5196:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                   5197: 	                               # connection liveness.
1.178     foxr     5198: 
1.212     foxr     5199:     #
                   5200:     #  Figure out who we're talking to so we can record the peer in 
                   5201:     #  the pid hash.
                   5202:     #
                   5203:     my $caller = getpeername($client);
                   5204:     my ($port,$iaddr);
                   5205:     if (defined($caller) && length($caller) > 0) {
                   5206: 	($port,$iaddr)=unpack_sockaddr_in($caller);
                   5207:     } else {
                   5208: 	&logthis("Unable to determine who caller was, getpeername returned nothing");
                   5209:     }
                   5210:     if (defined($iaddr)) {
                   5211: 	$clientip  = inet_ntoa($iaddr);
                   5212: 	Debug("Connected with $clientip");
                   5213:     } else {
                   5214: 	&logthis("Unable to determine clientip");
                   5215: 	$clientip='Unavailable';
                   5216:     }
                   5217:     
                   5218:     if ($pid) {
                   5219:         # Parent records the child's birth and returns.
                   5220:         sigprocmask(SIG_UNBLOCK, $sigset)
                   5221:             or die "Can't unblock SIGINT for fork: $!\n";
                   5222:         $children{$pid} = $clientip;
                   5223:         &status('Started child '.$pid);
                   5224:         return;
                   5225:     } else {
                   5226:         # Child can *not* return from this subroutine.
                   5227:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
                   5228:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
                   5229:                                 #don't get intercepted
                   5230:         $SIG{USR1}= \&logstatus;
                   5231:         $SIG{ALRM}= \&timeout;
                   5232:         $lastlog='Forked ';
                   5233:         $status='Forked';
1.178     foxr     5234: 
1.212     foxr     5235:         # unblock signals
                   5236:         sigprocmask(SIG_UNBLOCK, $sigset)
                   5237:             or die "Can't unblock SIGINT for fork: $!\n";
1.178     foxr     5238: 
1.212     foxr     5239: #        my $tmpsnum=0;            # Now global
                   5240: #---------------------------------------------------- kerberos 5 initialization
                   5241:         &Authen::Krb5::init_context();
1.297     raeburn  5242: 	unless (($dist eq 'fedora4') || ($dist eq 'suse9.3')) {
1.286     albertel 5243: 	    &Authen::Krb5::init_ets();
                   5244: 	}
1.209     albertel 5245: 
1.212     foxr     5246: 	&status('Accepted connection');
                   5247: # =============================================================================
                   5248:             # do something with the connection
                   5249: # -----------------------------------------------------------------------------
                   5250: 	# see if we know client and 'check' for spoof IP by ineffective challenge
1.178     foxr     5251: 
1.212     foxr     5252: 	ReadManagerTable;	# May also be a manager!!
                   5253: 	
1.278     albertel 5254: 	my $outsideip=$clientip;
                   5255: 	if ($clientip eq '127.0.0.1') {
                   5256: 	    $outsideip=$hostip{$perlvar{'lonHostID'}};
                   5257: 	}
                   5258: 
                   5259: 	my $clientrec=($hostid{$outsideip}     ne undef);
                   5260: 	my $ismanager=($managers{$outsideip}    ne undef);
1.212     foxr     5261: 	$clientname  = "[unknonwn]";
                   5262: 	if($clientrec) {	# Establish client type.
                   5263: 	    $ConnectionType = "client";
1.278     albertel 5264: 	    $clientname = $hostid{$outsideip};
1.212     foxr     5265: 	    if($ismanager) {
                   5266: 		$ConnectionType = "both";
                   5267: 	    }
                   5268: 	} else {
                   5269: 	    $ConnectionType = "manager";
1.278     albertel 5270: 	    $clientname = $managers{$outsideip};
1.212     foxr     5271: 	}
                   5272: 	my $clientok;
1.178     foxr     5273: 
1.212     foxr     5274: 	if ($clientrec || $ismanager) {
                   5275: 	    &status("Waiting for init from $clientip $clientname");
                   5276: 	    &logthis('<font color="yellow">INFO: Connection, '.
                   5277: 		     $clientip.
                   5278: 		  " ($clientname) connection type = $ConnectionType </font>" );
                   5279: 	    &status("Connecting $clientip  ($clientname))"); 
                   5280: 	    my $remotereq=<$client>;
                   5281: 	    chomp($remotereq);
                   5282: 	    Debug("Got init: $remotereq");
                   5283: 	    my $inikeyword = split(/:/, $remotereq);
                   5284: 	    if ($remotereq =~ /^init/) {
                   5285: 		&sethost("sethost:$perlvar{'lonHostID'}");
                   5286: 		#
                   5287: 		#  If the remote is attempting a local init... give that a try:
                   5288: 		#
                   5289: 		my ($i, $inittype) = split(/:/, $remotereq);
1.209     albertel 5290: 
1.212     foxr     5291: 		# If the connection type is ssl, but I didn't get my
                   5292: 		# certificate files yet, then I'll drop  back to 
                   5293: 		# insecure (if allowed).
                   5294: 		
                   5295: 		if($inittype eq "ssl") {
                   5296: 		    my ($ca, $cert) = lonssl::CertificateFile;
                   5297: 		    my $kfile       = lonssl::KeyFile;
                   5298: 		    if((!$ca)   || 
                   5299: 		       (!$cert) || 
                   5300: 		       (!$kfile)) {
                   5301: 			$inittype = ""; # This forces insecure attempt.
                   5302: 			&logthis("<font color=\"blue\"> Certificates not "
                   5303: 				 ."installed -- trying insecure auth</font>");
1.224     foxr     5304: 		    } else {	# SSL certificates are in place so
1.212     foxr     5305: 		    }		# Leave the inittype alone.
                   5306: 		}
                   5307: 
                   5308: 		if($inittype eq "local") {
                   5309: 		    my $key = LocalConnection($client, $remotereq);
                   5310: 		    if($key) {
                   5311: 			Debug("Got local key $key");
                   5312: 			$clientok     = 1;
                   5313: 			my $cipherkey = pack("H32", $key);
                   5314: 			$cipher       = new IDEA($cipherkey);
                   5315: 			print $client "ok:local\n";
                   5316: 			&logthis('<font color="green"'
                   5317: 				 . "Successful local authentication </font>");
                   5318: 			$keymode = "local"
1.178     foxr     5319: 		    } else {
1.212     foxr     5320: 			Debug("Failed to get local key");
                   5321: 			$clientok = 0;
                   5322: 			shutdown($client, 3);
                   5323: 			close $client;
1.178     foxr     5324: 		    }
1.212     foxr     5325: 		} elsif ($inittype eq "ssl") {
                   5326: 		    my $key = SSLConnection($client);
                   5327: 		    if ($key) {
                   5328: 			$clientok = 1;
                   5329: 			my $cipherkey = pack("H32", $key);
                   5330: 			$cipher       = new IDEA($cipherkey);
                   5331: 			&logthis('<font color="green">'
                   5332: 				 ."Successfull ssl authentication with $clientname </font>");
                   5333: 			$keymode = "ssl";
                   5334: 	     
1.178     foxr     5335: 		    } else {
1.212     foxr     5336: 			$clientok = 0;
                   5337: 			close $client;
1.178     foxr     5338: 		    }
1.212     foxr     5339: 	   
                   5340: 		} else {
                   5341: 		    my $ok = InsecureConnection($client);
                   5342: 		    if($ok) {
                   5343: 			$clientok = 1;
                   5344: 			&logthis('<font color="green">'
                   5345: 				 ."Successful insecure authentication with $clientname </font>");
                   5346: 			print $client "ok\n";
                   5347: 			$keymode = "insecure";
1.178     foxr     5348: 		    } else {
1.212     foxr     5349: 			&logthis('<font color="yellow">'
                   5350: 				  ."Attempted insecure connection disallowed </font>");
                   5351: 			close $client;
                   5352: 			$clientok = 0;
1.178     foxr     5353: 			
                   5354: 		    }
                   5355: 		}
1.212     foxr     5356: 	    } else {
                   5357: 		&logthis(
                   5358: 			 "<font color='blue'>WARNING: "
                   5359: 			 ."$clientip failed to initialize: >$remotereq< </font>");
                   5360: 		&status('No init '.$clientip);
                   5361: 	    }
                   5362: 	    
                   5363: 	} else {
                   5364: 	    &logthis(
                   5365: 		     "<font color='blue'>WARNING: Unknown client $clientip</font>");
                   5366: 	    &status('Hung up on '.$clientip);
                   5367: 	}
                   5368:  
                   5369: 	if ($clientok) {
                   5370: # ---------------- New known client connecting, could mean machine online again
                   5371: 	    
                   5372: 	    foreach my $id (keys(%hostip)) {
                   5373: 		if ($hostip{$id} ne $clientip ||
                   5374: 		    $hostip{$currenthostid} eq $clientip) {
                   5375: 		    # no need to try to do recon's to myself
                   5376: 		    next;
                   5377: 		}
1.307     albertel 5378: 		&reconlonc("$perlvar{'lonSockDir'}/".$hostname{$id});
1.212     foxr     5379: 	    }
                   5380: 	    &logthis("<font color='green'>Established connection: $clientname</font>");
                   5381: 	    &status('Will listen to '.$clientname);
                   5382: # ------------------------------------------------------------ Process requests
                   5383: 	    my $keep_going = 1;
                   5384: 	    my $user_input;
                   5385: 	    while(($user_input = get_request) && $keep_going) {
                   5386: 		alarm(120);
                   5387: 		Debug("Main: Got $user_input\n");
                   5388: 		$keep_going = &process_request($user_input);
1.178     foxr     5389: 		alarm(0);
1.212     foxr     5390: 		&status('Listening to '.$clientname." ($keymode)");	   
1.161     foxr     5391: 	    }
1.212     foxr     5392: 
1.59      www      5393: # --------------------------------------------- client unknown or fishy, refuse
1.212     foxr     5394: 	}  else {
1.161     foxr     5395: 	    print $client "refused\n";
                   5396: 	    $client->close();
1.190     albertel 5397: 	    &logthis("<font color='blue'>WARNING: "
1.161     foxr     5398: 		     ."Rejected client $clientip, closing connection</font>");
                   5399: 	}
1.212     foxr     5400:     }            
1.161     foxr     5401:     
1.1       albertel 5402: # =============================================================================
1.161     foxr     5403:     
1.190     albertel 5404:     &logthis("<font color='red'>CRITICAL: "
1.161     foxr     5405: 	     ."Disconnect from $clientip ($clientname)</font>");    
                   5406:     
                   5407:     
                   5408:     # this exit is VERY important, otherwise the child will become
                   5409:     # a producer of more and more children, forking yourself into
                   5410:     # process death.
                   5411:     exit;
1.106     foxr     5412:     
1.78      foxr     5413: }
1.261     foxr     5414: #
                   5415: #   Determine if a user is an author for the indicated domain.
                   5416: #
                   5417: # Parameters:
                   5418: #    domain          - domain to check in .
                   5419: #    user            - Name of user to check.
                   5420: #
                   5421: # Return:
                   5422: #     1             - User is an author for domain.
                   5423: #     0             - User is not an author for domain.
                   5424: sub is_author {
                   5425:     my ($domain, $user) = @_;
                   5426: 
                   5427:     &Debug("is_author: $user @ $domain");
                   5428: 
                   5429:     my $hashref = &tie_user_hash($domain, $user, "roles",
                   5430: 				 &GDBM_READER());
                   5431: 
                   5432:     #  Author role should show up as a key /domain/_au
1.78      foxr     5433: 
1.321     albertel 5434:     my $key    = "/$domain/_au";
                   5435:     my $value;
                   5436:     if (defined($hashref)) {
                   5437: 	$value = $hashref->{$key};
                   5438:     }
1.78      foxr     5439: 
1.261     foxr     5440:     if(defined($value)) {
                   5441: 	&Debug("$user @ $domain is an author");
                   5442:     }
                   5443: 
                   5444:     return defined($value);
                   5445: }
1.78      foxr     5446: #
                   5447: #   Checks to see if the input roleput request was to set
                   5448: # an author role.  If so, invokes the lchtmldir script to set
                   5449: # up a correct public_html 
                   5450: # Parameters:
                   5451: #    request   - The request sent to the rolesput subchunk.
                   5452: #                We're looking for  /domain/_au
                   5453: #    domain    - The domain in which the user is having roles doctored.
                   5454: #    user      - Name of the user for which the role is being put.
                   5455: #    authtype  - The authentication type associated with the user.
                   5456: #
1.289     albertel 5457: sub manage_permissions {
1.192     foxr     5458:     my ($request, $domain, $user, $authtype) = @_;
1.78      foxr     5459: 
1.261     foxr     5460:     &Debug("manage_permissions: $request $domain $user $authtype");
                   5461: 
1.78      foxr     5462:     # See if the request is of the form /$domain/_au
1.289     albertel 5463:     if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
1.78      foxr     5464: 	my $execdir = $perlvar{'lonDaemons'};
                   5465: 	my $userhome= "/home/$user" ;
1.134     albertel 5466: 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.261     foxr     5467: 	&Debug("Setting homedir permissions for $userhome");
1.78      foxr     5468: 	system("$execdir/lchtmldir $userhome $user $authtype");
                   5469:     }
                   5470: }
1.222     foxr     5471: 
                   5472: 
                   5473: #
                   5474: #  Return the full path of a user password file, whether it exists or not.
                   5475: # Parameters:
                   5476: #   domain     - Domain in which the password file lives.
                   5477: #   user       - name of the user.
                   5478: # Returns:
                   5479: #    Full passwd path:
                   5480: #
                   5481: sub password_path {
                   5482:     my ($domain, $user) = @_;
1.264     albertel 5483:     return &propath($domain, $user).'/passwd';
1.222     foxr     5484: }
                   5485: 
                   5486: #   Password Filename
                   5487: #   Returns the path to a passwd file given domain and user... only if
                   5488: #  it exists.
                   5489: # Parameters:
                   5490: #   domain    - Domain in which to search.
                   5491: #   user      - username.
                   5492: # Returns:
                   5493: #   - If the password file exists returns its path.
                   5494: #   - If the password file does not exist, returns undefined.
                   5495: #
                   5496: sub password_filename {
                   5497:     my ($domain, $user) = @_;
                   5498: 
                   5499:     Debug ("PasswordFilename called: dom = $domain user = $user");
                   5500: 
                   5501:     my $path  = &password_path($domain, $user);
                   5502:     Debug("PasswordFilename got path: $path");
                   5503:     if(-e $path) {
                   5504: 	return $path;
                   5505:     } else {
                   5506: 	return undef;
                   5507:     }
                   5508: }
                   5509: 
                   5510: #
                   5511: #   Rewrite the contents of the user's passwd file.
                   5512: #  Parameters:
                   5513: #    domain    - domain of the user.
                   5514: #    name      - User's name.
                   5515: #    contents  - New contents of the file.
                   5516: # Returns:
                   5517: #   0    - Failed.
                   5518: #   1    - Success.
                   5519: #
                   5520: sub rewrite_password_file {
                   5521:     my ($domain, $user, $contents) = @_;
                   5522: 
                   5523:     my $file = &password_filename($domain, $user);
                   5524:     if (defined $file) {
                   5525: 	my $pf = IO::File->new(">$file");
                   5526: 	if($pf) {
                   5527: 	    print $pf "$contents\n";
                   5528: 	    return 1;
                   5529: 	} else {
                   5530: 	    return 0;
                   5531: 	}
                   5532:     } else {
                   5533: 	return 0;
                   5534:     }
                   5535: 
                   5536: }
                   5537: 
1.78      foxr     5538: #
1.222     foxr     5539: #   get_auth_type - Determines the authorization type of a user in a domain.
1.78      foxr     5540: 
                   5541: #     Returns the authorization type or nouser if there is no such user.
                   5542: #
1.222     foxr     5543: sub get_auth_type 
1.78      foxr     5544: {
1.192     foxr     5545: 
                   5546:     my ($domain, $user)  = @_;
1.78      foxr     5547: 
1.222     foxr     5548:     Debug("get_auth_type( $domain, $user ) \n");
1.78      foxr     5549:     my $proname    = &propath($domain, $user); 
                   5550:     my $passwdfile = "$proname/passwd";
                   5551:     if( -e $passwdfile ) {
                   5552: 	my $pf = IO::File->new($passwdfile);
                   5553: 	my $realpassword = <$pf>;
                   5554: 	chomp($realpassword);
1.79      foxr     5555: 	Debug("Password info = $realpassword\n");
1.78      foxr     5556: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79      foxr     5557: 	Debug("Authtype = $authtype, content = $contentpwd\n");
1.259     raeburn  5558: 	return "$authtype:$contentpwd";     
1.224     foxr     5559:     } else {
1.79      foxr     5560: 	Debug("Returning nouser");
1.78      foxr     5561: 	return "nouser";
                   5562:     }
1.1       albertel 5563: }
                   5564: 
1.220     foxr     5565: #
                   5566: #  Validate a user given their domain, name and password.  This utility
                   5567: #  function is used by both  AuthenticateHandler and ChangePasswordHandler
                   5568: #  to validate the login credentials of a user.
                   5569: # Parameters:
                   5570: #    $domain    - The domain being logged into (this is required due to
                   5571: #                 the capability for multihomed systems.
                   5572: #    $user      - The name of the user being validated.
                   5573: #    $password  - The user's propoposed password.
                   5574: #
                   5575: # Returns:
                   5576: #     1        - The domain,user,pasword triplet corresponds to a valid
                   5577: #                user.
                   5578: #     0        - The domain,user,password triplet is not a valid user.
                   5579: #
                   5580: sub validate_user {
                   5581:     my ($domain, $user, $password) = @_;
                   5582: 
                   5583: 
                   5584:     # Why negative ~pi you may well ask?  Well this function is about
                   5585:     # authentication, and therefore very important to get right.
                   5586:     # I've initialized the flag that determines whether or not I've 
                   5587:     # validated correctly to a value it's not supposed to get.
                   5588:     # At the end of this function. I'll ensure that it's not still that
                   5589:     # value so we don't just wind up returning some accidental value
                   5590:     # as a result of executing an unforseen code path that
1.249     foxr     5591:     # did not set $validated.  At the end of valid execution paths,
                   5592:     # validated shoule be 1 for success or 0 for failuer.
1.220     foxr     5593: 
                   5594:     my $validated = -3.14159;
                   5595: 
                   5596:     #  How we authenticate is determined by the type of authentication
                   5597:     #  the user has been assigned.  If the authentication type is
                   5598:     #  "nouser", the user does not exist so we will return 0.
                   5599: 
1.222     foxr     5600:     my $contents = &get_auth_type($domain, $user);
1.220     foxr     5601:     my ($howpwd, $contentpwd) = split(/:/, $contents);
                   5602: 
                   5603:     my $null = pack("C",0);	# Used by kerberos auth types.
                   5604: 
                   5605:     if ($howpwd ne 'nouser') {
                   5606: 
                   5607: 	if($howpwd eq "internal") { # Encrypted is in local password file.
                   5608: 	    $validated = (crypt($password, $contentpwd) eq $contentpwd);
                   5609: 	}
                   5610: 	elsif ($howpwd eq "unix") { # User is a normal unix user.
                   5611: 	    $contentpwd = (getpwnam($user))[1];
                   5612: 	    if($contentpwd) {
                   5613: 		if($contentpwd eq 'x') { # Shadow password file...
                   5614: 		    my $pwauth_path = "/usr/local/sbin/pwauth";
                   5615: 		    open PWAUTH,  "|$pwauth_path" or
                   5616: 			die "Cannot invoke authentication";
                   5617: 		    print PWAUTH "$user\n$password\n";
                   5618: 		    close PWAUTH;
                   5619: 		    $validated = ! $?;
                   5620: 
                   5621: 		} else { 	         # Passwords in /etc/passwd. 
                   5622: 		    $validated = (crypt($password,
                   5623: 					$contentpwd) eq $contentpwd);
                   5624: 		}
                   5625: 	    } else {
                   5626: 		$validated = 0;
                   5627: 	    }
                   5628: 	}
                   5629: 	elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
                   5630: 	    if(! ($password =~ /$null/) ) {
                   5631: 		my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
                   5632: 							   "",
                   5633: 							   $contentpwd,,
                   5634: 							   'krbtgt',
                   5635: 							   $contentpwd,
                   5636: 							   1,
                   5637: 							   $password);
                   5638: 		if(!$k4error) {
                   5639: 		    $validated = 1;
1.224     foxr     5640: 		} else {
1.220     foxr     5641: 		    $validated = 0;
                   5642: 		    &logthis('krb4: '.$user.', '.$contentpwd.', '.
                   5643: 			     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
                   5644: 		}
1.224     foxr     5645: 	    } else {
1.220     foxr     5646: 		$validated = 0; # Password has a match with null.
                   5647: 	    }
1.224     foxr     5648: 	} elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
1.220     foxr     5649: 	    if(!($password =~ /$null/)) { # Null password not allowed.
                   5650: 		my $krbclient = &Authen::Krb5::parse_name($user.'@'
                   5651: 							  .$contentpwd);
                   5652: 		my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
                   5653: 		my $krbserver  = &Authen::Krb5::parse_name($krbservice);
                   5654: 		my $credentials= &Authen::Krb5::cc_default();
                   5655: 		$credentials->initialize($krbclient);
1.270     matthew  5656: 		my $krbreturn  = &Authen::Krb5::get_in_tkt_with_password($krbclient,
1.220     foxr     5657: 									 $krbserver,
                   5658: 									 $password,
                   5659: 									 $credentials);
                   5660: 		$validated = ($krbreturn == 1);
1.224     foxr     5661: 	    } else {
1.220     foxr     5662: 		$validated = 0;
                   5663: 	    }
1.224     foxr     5664: 	} elsif ($howpwd eq "localauth") { 
1.220     foxr     5665: 	    #  Authenticate via installation specific authentcation method:
                   5666: 	    $validated = &localauth::localauth($user, 
                   5667: 					       $password, 
                   5668: 					       $contentpwd);
1.224     foxr     5669: 	} else {			# Unrecognized auth is also bad.
1.220     foxr     5670: 	    $validated = 0;
                   5671: 	}
                   5672:     } else {
                   5673: 	$validated = 0;
                   5674:     }
                   5675:     #
                   5676:     #  $validated has the correct stat of the authentication:
                   5677:     #
                   5678: 
                   5679:     unless ($validated != -3.14159) {
1.249     foxr     5680: 	#  I >really really< want to know if this happens.
                   5681: 	#  since it indicates that user authentication is badly
                   5682: 	#  broken in some code path.
                   5683:         #
                   5684: 	die "ValidateUser - failed to set the value of validated $domain, $user $password";
1.220     foxr     5685:     }
                   5686:     return $validated;
                   5687: }
                   5688: 
                   5689: 
1.84      albertel 5690: sub addline {
                   5691:     my ($fname,$hostid,$ip,$newline)=@_;
                   5692:     my $contents;
                   5693:     my $found=0;
                   5694:     my $expr='^'.$hostid.':'.$ip.':';
                   5695:     $expr =~ s/\./\\\./g;
1.134     albertel 5696:     my $sh;
1.84      albertel 5697:     if ($sh=IO::File->new("$fname.subscription")) {
                   5698: 	while (my $subline=<$sh>) {
                   5699: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
                   5700: 	}
                   5701: 	$sh->close();
                   5702:     }
                   5703:     $sh=IO::File->new(">$fname.subscription");
                   5704:     if ($contents) { print $sh $contents; }
                   5705:     if ($newline) { print $sh $newline; }
                   5706:     $sh->close();
                   5707:     return $found;
1.86      www      5708: }
                   5709: 
1.234     foxr     5710: sub get_chat {
1.324     raeburn  5711:     my ($cdom,$cname,$udom,$uname,$group)=@_;
1.310     albertel 5712: 
1.87      www      5713:     my @entries=();
1.324     raeburn  5714:     my $namespace = 'nohist_chatroom';
                   5715:     my $namespace_inroom = 'nohist_inchatroom';
                   5716:     if (defined($group)) {
                   5717:         $namespace .= '_'.$group;
                   5718:         $namespace_inroom .= '_'.$group;
                   5719:     }
                   5720:     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
1.310     albertel 5721: 				 &GDBM_READER());
                   5722:     if ($hashref) {
                   5723: 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
1.311     albertel 5724: 	&untie_user_hash($hashref);
1.123     www      5725:     }
1.124     www      5726:     my @participants=();
1.134     albertel 5727:     my $cutoff=time-60;
1.324     raeburn  5728:     $hashref = &tie_user_hash($cdom, $cname, $namespace_inroom,
1.310     albertel 5729: 			      &GDBM_WRCREAT());
                   5730:     if ($hashref) {
                   5731:         $hashref->{$uname.':'.$udom}=time;
                   5732:         foreach my $user (sort(keys(%$hashref))) {
                   5733: 	    if ($hashref->{$user}>$cutoff) {
                   5734: 		push(@participants, 'active_participant:'.$user);
1.123     www      5735:             }
                   5736:         }
1.311     albertel 5737:         &untie_user_hash($hashref);
1.86      www      5738:     }
1.124     www      5739:     return (@participants,@entries);
1.86      www      5740: }
                   5741: 
1.234     foxr     5742: sub chat_add {
1.324     raeburn  5743:     my ($cdom,$cname,$newchat,$group)=@_;
1.88      albertel 5744:     my @entries=();
1.142     www      5745:     my $time=time;
1.324     raeburn  5746:     my $namespace = 'nohist_chatroom';
                   5747:     my $logfile = 'chatroom.log';
                   5748:     if (defined($group)) {
                   5749:         $namespace .= '_'.$group;
                   5750:         $logfile = 'chatroom_'.$group.'.log';
                   5751:     }
                   5752:     my $hashref = &tie_user_hash($cdom, $cname, $namespace,
1.310     albertel 5753: 				 &GDBM_WRCREAT());
                   5754:     if ($hashref) {
                   5755: 	@entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
1.88      albertel 5756: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
                   5757: 	my ($thentime,$idnum)=split(/\_/,$lastid);
                   5758: 	my $newid=$time.'_000000';
                   5759: 	if ($thentime==$time) {
                   5760: 	    $idnum=~s/^0+//;
                   5761: 	    $idnum++;
                   5762: 	    $idnum=substr('000000'.$idnum,-6,6);
                   5763: 	    $newid=$time.'_'.$idnum;
                   5764: 	}
1.310     albertel 5765: 	$hashref->{$newid}=$newchat;
1.88      albertel 5766: 	my $expired=$time-3600;
1.310     albertel 5767: 	foreach my $comment (keys(%$hashref)) {
                   5768: 	    my ($thistime) = ($comment=~/(\d+)\_/);
1.88      albertel 5769: 	    if ($thistime<$expired) {
1.310     albertel 5770: 		delete $hashref->{$comment};
1.88      albertel 5771: 	    }
                   5772: 	}
1.310     albertel 5773: 	{
                   5774: 	    my $proname=&propath($cdom,$cname);
1.324     raeburn  5775: 	    if (open(CHATLOG,">>$proname/$logfile")) { 
1.310     albertel 5776: 		print CHATLOG ("$time:".&unescape($newchat)."\n");
                   5777: 	    }
                   5778: 	    close(CHATLOG);
1.142     www      5779: 	}
1.311     albertel 5780: 	&untie_user_hash($hashref);
1.86      www      5781:     }
1.84      albertel 5782: }
                   5783: 
                   5784: sub unsub {
                   5785:     my ($fname,$clientip)=@_;
                   5786:     my $result;
1.188     foxr     5787:     my $unsubs = 0;		# Number of successful unsubscribes:
                   5788: 
                   5789: 
                   5790:     # An old way subscriptions were handled was to have a 
                   5791:     # subscription marker file:
                   5792: 
                   5793:     Debug("Attempting unlink of $fname.$clientname");
1.161     foxr     5794:     if (unlink("$fname.$clientname")) {
1.188     foxr     5795: 	$unsubs++;		# Successful unsub via marker file.
                   5796:     } 
                   5797: 
                   5798:     # The more modern way to do it is to have a subscription list
                   5799:     # file:
                   5800: 
1.84      albertel 5801:     if (-e "$fname.subscription") {
1.161     foxr     5802: 	my $found=&addline($fname,$clientname,$clientip,'');
1.188     foxr     5803: 	if ($found) { 
                   5804: 	    $unsubs++;
                   5805: 	}
                   5806:     } 
                   5807: 
                   5808:     #  If either or both of these mechanisms succeeded in unsubscribing a 
                   5809:     #  resource we can return ok:
                   5810: 
                   5811:     if($unsubs) {
                   5812: 	$result = "ok\n";
1.84      albertel 5813:     } else {
1.188     foxr     5814: 	$result = "not_subscribed\n";
1.84      albertel 5815:     }
1.188     foxr     5816: 
1.84      albertel 5817:     return $result;
                   5818: }
                   5819: 
1.101     www      5820: sub currentversion {
                   5821:     my $fname=shift;
                   5822:     my $version=-1;
                   5823:     my $ulsdir='';
                   5824:     if ($fname=~/^(.+)\/[^\/]+$/) {
                   5825:        $ulsdir=$1;
                   5826:     }
1.114     albertel 5827:     my ($fnamere1,$fnamere2);
                   5828:     # remove version if already specified
1.101     www      5829:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114     albertel 5830:     # get the bits that go before and after the version number
                   5831:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
                   5832: 	$fnamere1=$1;
                   5833: 	$fnamere2='.'.$2;
                   5834:     }
1.101     www      5835:     if (-e $fname) { $version=1; }
                   5836:     if (-e $ulsdir) {
1.134     albertel 5837: 	if(-d $ulsdir) {
                   5838: 	    if (opendir(LSDIR,$ulsdir)) {
                   5839: 		my $ulsfn;
                   5840: 		while ($ulsfn=readdir(LSDIR)) {
1.101     www      5841: # see if this is a regular file (ignore links produced earlier)
1.134     albertel 5842: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
                   5843: 		    unless (-l $thisfile) {
1.160     www      5844: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134     albertel 5845: 			    if ($1>$version) { $version=$1; }
                   5846: 			}
                   5847: 		    }
                   5848: 		}
                   5849: 		closedir(LSDIR);
                   5850: 		$version++;
                   5851: 	    }
                   5852: 	}
                   5853:     }
                   5854:     return $version;
1.101     www      5855: }
                   5856: 
                   5857: sub thisversion {
                   5858:     my $fname=shift;
                   5859:     my $version=-1;
                   5860:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
                   5861: 	$version=$1;
                   5862:     }
                   5863:     return $version;
                   5864: }
                   5865: 
1.84      albertel 5866: sub subscribe {
                   5867:     my ($userinput,$clientip)=@_;
                   5868:     my $result;
1.293     albertel 5869:     my ($cmd,$fname)=split(/:/,$userinput,2);
1.84      albertel 5870:     my $ownership=&ishome($fname);
                   5871:     if ($ownership eq 'owner') {
1.101     www      5872: # explitly asking for the current version?
                   5873:         unless (-e $fname) {
                   5874:             my $currentversion=&currentversion($fname);
                   5875: 	    if (&thisversion($fname)==$currentversion) {
                   5876:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
                   5877: 		    my $root=$1;
                   5878:                     my $extension=$2;
                   5879:                     symlink($root.'.'.$extension,
                   5880:                             $root.'.'.$currentversion.'.'.$extension);
1.102     www      5881:                     unless ($extension=~/\.meta$/) {
                   5882:                        symlink($root.'.'.$extension.'.meta',
                   5883:                             $root.'.'.$currentversion.'.'.$extension.'.meta');
                   5884: 		    }
1.101     www      5885:                 }
                   5886:             }
                   5887:         }
1.84      albertel 5888: 	if (-e $fname) {
                   5889: 	    if (-d $fname) {
                   5890: 		$result="directory\n";
                   5891: 	    } else {
1.161     foxr     5892: 		if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134     albertel 5893: 		my $now=time;
1.161     foxr     5894: 		my $found=&addline($fname,$clientname,$clientip,
                   5895: 				   "$clientname:$clientip:$now\n");
1.84      albertel 5896: 		if ($found) { $result="$fname\n"; }
                   5897: 		# if they were subscribed to only meta data, delete that
                   5898:                 # subscription, when you subscribe to a file you also get
                   5899:                 # the metadata
                   5900: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
                   5901: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
                   5902: 		$fname="http://$thisserver/".$fname;
                   5903: 		$result="$fname\n";
                   5904: 	    }
                   5905: 	} else {
                   5906: 	    $result="not_found\n";
                   5907: 	}
                   5908:     } else {
                   5909: 	$result="rejected\n";
                   5910:     }
                   5911:     return $result;
                   5912: }
1.287     foxr     5913: #  Change the passwd of a unix user.  The caller must have
                   5914: #  first verified that the user is a loncapa user.
                   5915: #
                   5916: # Parameters:
                   5917: #    user      - Unix user name to change.
                   5918: #    pass      - New password for the user.
                   5919: # Returns:
                   5920: #    ok    - if success
                   5921: #    other - Some meaningfule error message string.
                   5922: # NOTE:
                   5923: #    invokes a setuid script to change the passwd.
                   5924: sub change_unix_password {
                   5925:     my ($user, $pass) = @_;
                   5926: 
                   5927:     &Debug("change_unix_password");
                   5928:     my $execdir=$perlvar{'lonDaemons'};
                   5929:     &Debug("Opening lcpasswd pipeline");
                   5930:     my $pf = IO::File->new("|$execdir/lcpasswd > "
                   5931: 			   ."$perlvar{'lonDaemons'}"
                   5932: 			   ."/logs/lcpasswd.log");
                   5933:     print $pf "$user\n$pass\n$pass\n";
                   5934:     close $pf;
                   5935:     my $err = $?;
                   5936:     return ($err < @passwderrors) ? $passwderrors[$err] : 
                   5937: 	"pwchange_falure - unknown error";
                   5938: 
                   5939:     
                   5940: }
                   5941: 
1.91      albertel 5942: 
                   5943: sub make_passwd_file {
1.98      foxr     5944:     my ($uname, $umode,$npass,$passfilename)=@_;
1.91      albertel 5945:     my $result="ok\n";
                   5946:     if ($umode eq 'krb4' or $umode eq 'krb5') {
                   5947: 	{
                   5948: 	    my $pf = IO::File->new(">$passfilename");
1.261     foxr     5949: 	    if ($pf) {
                   5950: 		print $pf "$umode:$npass\n";
                   5951: 	    } else {
                   5952: 		$result = "pass_file_failed_error";
                   5953: 	    }
1.91      albertel 5954: 	}
                   5955:     } elsif ($umode eq 'internal') {
                   5956: 	my $salt=time;
                   5957: 	$salt=substr($salt,6,2);
                   5958: 	my $ncpass=crypt($npass,$salt);
                   5959: 	{
                   5960: 	    &Debug("Creating internal auth");
                   5961: 	    my $pf = IO::File->new(">$passfilename");
1.261     foxr     5962: 	    if($pf) {
                   5963: 		print $pf "internal:$ncpass\n"; 
                   5964: 	    } else {
                   5965: 		$result = "pass_file_failed_error";
                   5966: 	    }
1.91      albertel 5967: 	}
                   5968:     } elsif ($umode eq 'localauth') {
                   5969: 	{
                   5970: 	    my $pf = IO::File->new(">$passfilename");
1.261     foxr     5971: 	    if($pf) {
                   5972: 		print $pf "localauth:$npass\n";
                   5973: 	    } else {
                   5974: 		$result = "pass_file_failed_error";
                   5975: 	    }
1.91      albertel 5976: 	}
                   5977:     } elsif ($umode eq 'unix') {
                   5978: 	{
1.186     foxr     5979: 	    #
                   5980: 	    #  Don't allow the creation of privileged accounts!!! that would
                   5981: 	    #  be real bad!!!
                   5982: 	    #
                   5983: 	    my $uid = getpwnam($uname);
                   5984: 	    if((defined $uid) && ($uid == 0)) {
                   5985: 		&logthis(">>>Attempted to create privilged account blocked");
                   5986: 		return "no_priv_account_error\n";
                   5987: 	    }
                   5988: 
1.223     foxr     5989: 	    my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
1.224     foxr     5990: 
                   5991: 	    my $lc_error_file  = $execdir."/tmp/lcuseradd".$$.".status";
1.91      albertel 5992: 	    {
                   5993: 		&Debug("Executing external: ".$execpath);
1.98      foxr     5994: 		&Debug("user  = ".$uname.", Password =". $npass);
1.132     matthew  5995: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91      albertel 5996: 		print $se "$uname\n";
                   5997: 		print $se "$npass\n";
                   5998: 		print $se "$npass\n";
1.223     foxr     5999: 		print $se "$lc_error_file\n"; # Status -> unique file.
1.97      foxr     6000: 	    }
1.285     foxr     6001: 	    if (-r $lc_error_file) {
                   6002: 		&Debug("Opening error file: $lc_error_file");
                   6003: 		my $error = IO::File->new("< $lc_error_file");
                   6004: 		my $useraddok = <$error>;
                   6005: 		$error->close;
                   6006: 		unlink($lc_error_file);
                   6007: 		
                   6008: 		chomp $useraddok;
                   6009: 	
                   6010: 		if($useraddok > 0) {
                   6011: 		    my $error_text = &lcuseraddstrerror($useraddok);
                   6012: 		    &logthis("Failed lcuseradd: $error_text");
                   6013: 		    $result = "lcuseradd_failed:$error_text\n";
                   6014: 		}  else {
                   6015: 		    my $pf = IO::File->new(">$passfilename");
                   6016: 		    if($pf) {
                   6017: 			print $pf "unix:\n";
                   6018: 		    } else {
                   6019: 			$result = "pass_file_failed_error";
                   6020: 		    }
                   6021: 		}
1.224     foxr     6022: 	    }  else {
1.285     foxr     6023: 		&Debug("Could not locate lcuseradd error: $lc_error_file");
                   6024: 		$result="bug_lcuseradd_no_output_file";
1.91      albertel 6025: 	    }
                   6026: 	}
                   6027:     } elsif ($umode eq 'none') {
                   6028: 	{
1.223     foxr     6029: 	    my $pf = IO::File->new("> $passfilename");
1.261     foxr     6030: 	    if($pf) {
                   6031: 		print $pf "none:\n";
                   6032: 	    } else {
                   6033: 		$result = "pass_file_failed_error";
                   6034: 	    }
1.91      albertel 6035: 	}
                   6036:     } else {
                   6037: 	$result="auth_mode_error\n";
                   6038:     }
                   6039:     return $result;
1.121     albertel 6040: }
                   6041: 
1.265     albertel 6042: sub convert_photo {
                   6043:     my ($start,$dest)=@_;
                   6044:     system("convert $start $dest");
                   6045: }
                   6046: 
1.121     albertel 6047: sub sethost {
                   6048:     my ($remotereq) = @_;
                   6049:     my (undef,$hostid)=split(/:/,$remotereq);
1.322     albertel 6050:     # ignore sethost if we are already correct
                   6051:     if ($hostid eq $currenthostid) {
                   6052: 	return 'ok';
                   6053:     }
                   6054: 
1.121     albertel 6055:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
                   6056:     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
1.200     matthew  6057: 	$currenthostid  =$hostid;
1.121     albertel 6058: 	$currentdomainid=$hostdom{$hostid};
                   6059: 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
                   6060:     } else {
                   6061: 	&logthis("Requested host id $hostid not an alias of ".
                   6062: 		 $perlvar{'lonHostID'}." refusing connection");
                   6063: 	return 'unable_to_set';
                   6064:     }
                   6065:     return 'ok';
                   6066: }
                   6067: 
                   6068: sub version {
                   6069:     my ($userinput)=@_;
                   6070:     $remoteVERSION=(split(/:/,$userinput))[1];
                   6071:     return "version:$VERSION";
1.127     albertel 6072: }
1.178     foxr     6073: 
1.128     albertel 6074: #There is a copy of this in lonnet.pm
1.127     albertel 6075: sub userload {
                   6076:     my $numusers=0;
                   6077:     {
                   6078: 	opendir(LONIDS,$perlvar{'lonIDsDir'});
                   6079: 	my $filename;
                   6080: 	my $curtime=time;
                   6081: 	while ($filename=readdir(LONIDS)) {
                   6082: 	    if ($filename eq '.' || $filename eq '..') {next;}
1.138     albertel 6083: 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159     albertel 6084: 	    if ($curtime-$mtime < 1800) { $numusers++; }
1.127     albertel 6085: 	}
                   6086: 	closedir(LONIDS);
                   6087:     }
                   6088:     my $userloadpercent=0;
                   6089:     my $maxuserload=$perlvar{'lonUserLoadLim'};
                   6090:     if ($maxuserload) {
1.129     albertel 6091: 	$userloadpercent=100*$numusers/$maxuserload;
1.127     albertel 6092:     }
1.130     albertel 6093:     $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127     albertel 6094:     return $userloadpercent;
1.91      albertel 6095: }
                   6096: 
1.205     raeburn  6097: # Routines for serializing arrays and hashes (copies from lonnet)
                   6098: 
                   6099: sub array2str {
                   6100:   my (@array) = @_;
                   6101:   my $result=&arrayref2str(\@array);
                   6102:   $result=~s/^__ARRAY_REF__//;
                   6103:   $result=~s/__END_ARRAY_REF__$//;
                   6104:   return $result;
                   6105: }
                   6106:                                                                                  
                   6107: sub arrayref2str {
                   6108:   my ($arrayref) = @_;
                   6109:   my $result='__ARRAY_REF__';
                   6110:   foreach my $elem (@$arrayref) {
                   6111:     if(ref($elem) eq 'ARRAY') {
                   6112:       $result.=&arrayref2str($elem).'&';
                   6113:     } elsif(ref($elem) eq 'HASH') {
                   6114:       $result.=&hashref2str($elem).'&';
                   6115:     } elsif(ref($elem)) {
                   6116:       #print("Got a ref of ".(ref($elem))." skipping.");
                   6117:     } else {
                   6118:       $result.=&escape($elem).'&';
                   6119:     }
                   6120:   }
                   6121:   $result=~s/\&$//;
                   6122:   $result .= '__END_ARRAY_REF__';
                   6123:   return $result;
                   6124: }
                   6125:                                                                                  
                   6126: sub hash2str {
                   6127:   my (%hash) = @_;
                   6128:   my $result=&hashref2str(\%hash);
                   6129:   $result=~s/^__HASH_REF__//;
                   6130:   $result=~s/__END_HASH_REF__$//;
                   6131:   return $result;
                   6132: }
                   6133:                                                                                  
                   6134: sub hashref2str {
                   6135:   my ($hashref)=@_;
                   6136:   my $result='__HASH_REF__';
                   6137:   foreach (sort(keys(%$hashref))) {
                   6138:     if (ref($_) eq 'ARRAY') {
                   6139:       $result.=&arrayref2str($_).'=';
                   6140:     } elsif (ref($_) eq 'HASH') {
                   6141:       $result.=&hashref2str($_).'=';
                   6142:     } elsif (ref($_)) {
                   6143:       $result.='=';
                   6144:       #print("Got a ref of ".(ref($_))." skipping.");
                   6145:     } else {
                   6146:         if ($_) {$result.=&escape($_).'=';} else { last; }
                   6147:     }
                   6148: 
                   6149:     if(ref($hashref->{$_}) eq 'ARRAY') {
                   6150:       $result.=&arrayref2str($hashref->{$_}).'&';
                   6151:     } elsif(ref($hashref->{$_}) eq 'HASH') {
                   6152:       $result.=&hashref2str($hashref->{$_}).'&';
                   6153:     } elsif(ref($hashref->{$_})) {
                   6154:        $result.='&';
                   6155:       #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
                   6156:     } else {
                   6157:       $result.=&escape($hashref->{$_}).'&';
                   6158:     }
                   6159:   }
                   6160:   $result=~s/\&$//;
                   6161:   $result .= '__END_HASH_REF__';
                   6162:   return $result;
                   6163: }
1.200     matthew  6164: 
1.61      harris41 6165: # ----------------------------------- POD (plain old documentation, CPAN style)
                   6166: 
                   6167: =head1 NAME
                   6168: 
                   6169: lond - "LON Daemon" Server (port "LOND" 5663)
                   6170: 
                   6171: =head1 SYNOPSIS
                   6172: 
1.74      harris41 6173: Usage: B<lond>
                   6174: 
                   6175: Should only be run as user=www.  This is a command-line script which
                   6176: is invoked by B<loncron>.  There is no expectation that a typical user
                   6177: will manually start B<lond> from the command-line.  (In other words,
                   6178: DO NOT START B<lond> YOURSELF.)
1.61      harris41 6179: 
                   6180: =head1 DESCRIPTION
                   6181: 
1.74      harris41 6182: There are two characteristics associated with the running of B<lond>,
                   6183: PROCESS MANAGEMENT (starting, stopping, handling child processes)
                   6184: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
                   6185: subscriptions, etc).  These are described in two large
                   6186: sections below.
                   6187: 
                   6188: B<PROCESS MANAGEMENT>
                   6189: 
1.61      harris41 6190: Preforker - server who forks first. Runs as a daemon. HUPs.
                   6191: Uses IDEA encryption
                   6192: 
1.74      harris41 6193: B<lond> forks off children processes that correspond to the other servers
                   6194: in the network.  Management of these processes can be done at the
                   6195: parent process level or the child process level.
                   6196: 
                   6197: B<logs/lond.log> is the location of log messages.
                   6198: 
                   6199: The process management is now explained in terms of linux shell commands,
                   6200: subroutines internal to this code, and signal assignments:
                   6201: 
                   6202: =over 4
                   6203: 
                   6204: =item *
                   6205: 
                   6206: PID is stored in B<logs/lond.pid>
                   6207: 
                   6208: This is the process id number of the parent B<lond> process.
                   6209: 
                   6210: =item *
                   6211: 
                   6212: SIGTERM and SIGINT
                   6213: 
                   6214: Parent signal assignment:
                   6215:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   6216: 
                   6217: Child signal assignment:
                   6218:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
                   6219: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
                   6220:  to restart a new child.)
                   6221: 
                   6222: Command-line invocations:
                   6223:  B<kill> B<-s> SIGTERM I<PID>
                   6224:  B<kill> B<-s> SIGINT I<PID>
                   6225: 
                   6226: Subroutine B<HUNTSMAN>:
                   6227:  This is only invoked for the B<lond> parent I<PID>.
                   6228: This kills all the children, and then the parent.
                   6229: The B<lonc.pid> file is cleared.
                   6230: 
                   6231: =item *
                   6232: 
                   6233: SIGHUP
                   6234: 
                   6235: Current bug:
                   6236:  This signal can only be processed the first time
                   6237: on the parent process.  Subsequent SIGHUP signals
                   6238: have no effect.
                   6239: 
                   6240: Parent signal assignment:
                   6241:  $SIG{HUP}  = \&HUPSMAN;
                   6242: 
                   6243: Child signal assignment:
                   6244:  none (nothing happens)
                   6245: 
                   6246: Command-line invocations:
                   6247:  B<kill> B<-s> SIGHUP I<PID>
                   6248: 
                   6249: Subroutine B<HUPSMAN>:
                   6250:  This is only invoked for the B<lond> parent I<PID>,
                   6251: This kills all the children, and then the parent.
                   6252: The B<lond.pid> file is cleared.
                   6253: 
                   6254: =item *
                   6255: 
                   6256: SIGUSR1
                   6257: 
                   6258: Parent signal assignment:
                   6259:  $SIG{USR1} = \&USRMAN;
                   6260: 
                   6261: Child signal assignment:
                   6262:  $SIG{USR1}= \&logstatus;
                   6263: 
                   6264: Command-line invocations:
                   6265:  B<kill> B<-s> SIGUSR1 I<PID>
                   6266: 
                   6267: Subroutine B<USRMAN>:
                   6268:  When invoked for the B<lond> parent I<PID>,
                   6269: SIGUSR1 is sent to all the children, and the status of
                   6270: each connection is logged.
1.144     foxr     6271: 
                   6272: =item *
                   6273: 
                   6274: SIGUSR2
                   6275: 
                   6276: Parent Signal assignment:
                   6277:     $SIG{USR2} = \&UpdateHosts
                   6278: 
                   6279: Child signal assignment:
                   6280:     NONE
                   6281: 
1.74      harris41 6282: 
                   6283: =item *
                   6284: 
                   6285: SIGCHLD
                   6286: 
                   6287: Parent signal assignment:
                   6288:  $SIG{CHLD} = \&REAPER;
                   6289: 
                   6290: Child signal assignment:
                   6291:  none
                   6292: 
                   6293: Command-line invocations:
                   6294:  B<kill> B<-s> SIGCHLD I<PID>
                   6295: 
                   6296: Subroutine B<REAPER>:
                   6297:  This is only invoked for the B<lond> parent I<PID>.
                   6298: Information pertaining to the child is removed.
                   6299: The socket port is cleaned up.
                   6300: 
                   6301: =back
                   6302: 
                   6303: B<SERVER-SIDE ACTIVITIES>
                   6304: 
                   6305: Server-side information can be accepted in an encrypted or non-encrypted
                   6306: method.
                   6307: 
                   6308: =over 4
                   6309: 
                   6310: =item ping
                   6311: 
                   6312: Query a client in the hosts.tab table; "Are you there?"
                   6313: 
                   6314: =item pong
                   6315: 
                   6316: Respond to a ping query.
                   6317: 
                   6318: =item ekey
                   6319: 
                   6320: Read in encrypted key, make cipher.  Respond with a buildkey.
                   6321: 
                   6322: =item load
                   6323: 
                   6324: Respond with CPU load based on a computation upon /proc/loadavg.
                   6325: 
                   6326: =item currentauth
                   6327: 
                   6328: Reply with current authentication information (only over an
                   6329: encrypted channel).
                   6330: 
                   6331: =item auth
                   6332: 
                   6333: Only over an encrypted channel, reply as to whether a user's
                   6334: authentication information can be validated.
                   6335: 
                   6336: =item passwd
                   6337: 
                   6338: Allow for a password to be set.
                   6339: 
                   6340: =item makeuser
                   6341: 
                   6342: Make a user.
                   6343: 
                   6344: =item passwd
                   6345: 
                   6346: Allow for authentication mechanism and password to be changed.
                   6347: 
                   6348: =item home
1.61      harris41 6349: 
1.74      harris41 6350: Respond to a question "are you the home for a given user?"
                   6351: 
                   6352: =item update
                   6353: 
                   6354: Update contents of a subscribed resource.
                   6355: 
                   6356: =item unsubscribe
                   6357: 
                   6358: The server is unsubscribing from a resource.
                   6359: 
                   6360: =item subscribe
                   6361: 
                   6362: The server is subscribing to a resource.
                   6363: 
                   6364: =item log
                   6365: 
                   6366: Place in B<logs/lond.log>
                   6367: 
                   6368: =item put
                   6369: 
                   6370: stores hash in namespace
                   6371: 
1.230     foxr     6372: =item rolesputy
1.74      harris41 6373: 
                   6374: put a role into a user's environment
                   6375: 
                   6376: =item get
                   6377: 
                   6378: returns hash with keys from array
                   6379: reference filled in from namespace
                   6380: 
                   6381: =item eget
                   6382: 
                   6383: returns hash with keys from array
                   6384: reference filled in from namesp (encrypts the return communication)
                   6385: 
                   6386: =item rolesget
                   6387: 
                   6388: get a role from a user's environment
                   6389: 
                   6390: =item del
                   6391: 
                   6392: deletes keys out of array from namespace
                   6393: 
                   6394: =item keys
                   6395: 
                   6396: returns namespace keys
                   6397: 
                   6398: =item dump
                   6399: 
                   6400: dumps the complete (or key matching regexp) namespace into a hash
                   6401: 
                   6402: =item store
                   6403: 
                   6404: stores hash permanently
                   6405: for this url; hashref needs to be given and should be a \%hashname; the
                   6406: remaining args aren't required and if they aren't passed or are '' they will
                   6407: be derived from the ENV
                   6408: 
                   6409: =item restore
                   6410: 
                   6411: returns a hash for a given url
                   6412: 
                   6413: =item querysend
                   6414: 
                   6415: Tells client about the lonsql process that has been launched in response
                   6416: to a sent query.
                   6417: 
                   6418: =item queryreply
                   6419: 
                   6420: Accept information from lonsql and make appropriate storage in temporary
                   6421: file space.
                   6422: 
                   6423: =item idput
                   6424: 
                   6425: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
                   6426: for each student, defined perhaps by the institutional Registrar.)
                   6427: 
                   6428: =item idget
                   6429: 
                   6430: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
                   6431: for each student, defined perhaps by the institutional Registrar.)
                   6432: 
                   6433: =item tmpput
                   6434: 
                   6435: Accept and store information in temporary space.
                   6436: 
                   6437: =item tmpget
                   6438: 
                   6439: Send along temporarily stored information.
                   6440: 
                   6441: =item ls
                   6442: 
                   6443: List part of a user's directory.
                   6444: 
1.135     foxr     6445: =item pushtable
                   6446: 
                   6447: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
                   6448: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
                   6449: must be restored manually in case of a problem with the new table file.
                   6450: pushtable requires that the request be encrypted and validated via
                   6451: ValidateManager.  The form of the command is:
                   6452: enc:pushtable tablename <tablecontents> \n
                   6453: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
                   6454: cleartext newline.
                   6455: 
1.74      harris41 6456: =item Hanging up (exit or init)
                   6457: 
                   6458: What to do when a client tells the server that they (the client)
                   6459: are leaving the network.
                   6460: 
                   6461: =item unknown command
                   6462: 
                   6463: If B<lond> is sent an unknown command (not in the list above),
                   6464: it replys to the client "unknown_cmd".
1.135     foxr     6465: 
1.74      harris41 6466: 
                   6467: =item UNKNOWN CLIENT
                   6468: 
                   6469: If the anti-spoofing algorithm cannot verify the client,
                   6470: the client is rejected (with a "refused" message sent
                   6471: to the client, and the connection is closed.
                   6472: 
                   6473: =back
1.61      harris41 6474: 
                   6475: =head1 PREREQUISITES
                   6476: 
                   6477: IO::Socket
                   6478: IO::File
                   6479: Apache::File
                   6480: POSIX
                   6481: Crypt::IDEA
                   6482: LWP::UserAgent()
                   6483: GDBM_File
                   6484: Authen::Krb4
1.91      albertel 6485: Authen::Krb5
1.61      harris41 6486: 
                   6487: =head1 COREQUISITES
                   6488: 
                   6489: =head1 OSNAMES
                   6490: 
                   6491: linux
                   6492: 
                   6493: =head1 SCRIPT CATEGORIES
                   6494: 
                   6495: Server/Process
                   6496: 
                   6497: =cut

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