File:  [LON-CAPA] / loncom / lond
Revision 1.152: download - view: text, annotated - select for diffs
Wed Oct 8 14:18:34 2003 UTC (21 years ago) by www
Branches: MAIN
CVS tags: HEAD
Not good: this should be backported into 1.0.2!

    1: #!/usr/bin/perl
    2: # The LearningOnline Network
    3: # lond "LON Daemon" Server (port "LOND" 5663)
    4: #
    5: # $Id: lond,v 1.152 2003/10/08 14:18:34 www Exp $
    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
   13: # the Free Software Foundation; either version 2 of the License, or
   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
   23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   24: #
   25: # /home/httpd/html/adm/gpl.txt
   26: #
   27: # http://www.lon-capa.org/
   28: #
   29: # 5/26/99,6/4,6/10,6/11,6/14,6/15,6/26,6/28,6/30,
   30: # 7/8,7/9,7/10,7/12,7/17,7/19,9/21,
   31: # 10/7,10/8,10/9,10/11,10/13,10/15,11/4,11/16,
   32: # 12/7,12/15,01/06,01/11,01/12,01/14,2/8,
   33: # 03/07,05/31 Gerd Kortemeyer
   34: # 06/29,06/30,07/14,07/15,07/17,07/20,07/25,09/18 Gerd Kortemeyer
   35: # 12/05,12/13,12/29 Gerd Kortemeyer
   36: # YEAR=2001
   37: # 02/12 Gerd Kortemeyer
   38: # 03/24 Gerd Kortemeyer
   39: # 05/11,05/28,08/30 Gerd Kortemeyer
   40: # 11/26,11/27 Gerd Kortemeyer
   41: # 12/22 Gerd Kortemeyer
   42: # YEAR=2002
   43: # 01/20/02,02/05 Gerd Kortemeyer
   44: # 02/05 Guy Albertelli
   45: # 02/12 Gerd Kortemeyer
   46: # 02/19 Matthew Hall
   47: # 02/25 Gerd Kortemeyer
   48: # 01/xx/2003 Ron Fox.. Remove preforking.  This makes the general daemon
   49: #      logic simpler (and there were problems maintaining the preforked
   50: #      population).  Since the time averaged connection rate is close to zero
   51: #      because lonc's purpose is to maintain near continuous connnections,
   52: #      preforking is not really needed.
   53: # 08/xx/2003 Ron Fox:  Add management requests.  Management requests
   54: #      will be validated via a call to ValidateManager. At present, this
   55: #      is done by simple host verification.  In the future we can modify
   56: #      this function to do a certificate check.
   57: #      Management functions supported include:
   58: #       - pushing /home/httpd/lonTabs/hosts.tab
   59: #       - pushing /home/httpd/lonTabs/domain.tab
   60: # 09/08/2003 Ron Fox:  Told lond to take care of change logging so we
   61: #      don't have to remember it:
   62: # $Log: lond,v $
   63: # Revision 1.152  2003/10/08 14:18:34  www
   64: # Not good: this should be backported into 1.0.2!
   65: #
   66: # Revision 1.151  2003/10/03 15:11:03  albertel
   67: # - if we fail to fetch an update to the file, don't blow away the old one
   68: #   (this was the BUG that blew away that one default.sequence that Matthew
   69: #    ended up restoring from data.)
   70: #
   71: # Revision 1.150  2003/09/30 10:16:06  foxr
   72: # Added invocation of apachereload in ReloadApache sub.
   73: # This completes the addtion of the reinit functionality.
   74: #
   75: # Revision 1.149  2003/09/30 09:44:13  foxr
   76: # Tested UpdateHosts ability to
   77: # - Remove live children for hosts that are no longer in the hosts.tab
   78: # - Remove live children for hosts whose IPs have changed in the hosts.tab
   79: #
   80: # Revision 1.148  2003/09/29 10:09:18  foxr
   81: # Put in logic to reinit lond itself (except for apache reload).  I don't believe
   82: # this logic works correctly yet, however lond still does everything it used to doso I'll do the commit anyway.
   83: #
   84: # Revision 1.147  2003/09/23 11:23:31  foxr
   85: # Comlplete implementation of reinit functionality.  Must still implement
   86: # the actual initialization functionality, but the process can now
   87: # receive the request and either invoke the appropriate internal function or
   88: # signal the correct lonc.
   89: #
   90: # Revision 1.146  2003/09/16 10:28:14  foxr
   91: # ReinitProcess - decode the process selector and produce the associated pid
   92: # filename.  Note: While it is possible to test that valid process selectors are
   93: # handled properly I am not able to test that invalid process selectors produce
   94: # the appropriate error as lonManage also blocks the use of invalid process selectors.
   95: #
   96: # Revision 1.145  2003/09/16 10:13:20  foxr
   97: # Added ReinitProcess function to oversee the parsing and processing of the
   98: # reinit:<process> client request.
   99: #
  100: # Revision 1.144  2003/09/16 09:47:01  foxr
  101: # Added skeletal support for SIGUSR2 (update hosts.tab)
  102: #
  103: # Revision 1.143  2003/09/15 10:03:52  foxr
  104: # Completed and tested code for pushfile.
  105: #
  106: # Revision 1.142  2003/09/09 20:47:46  www
  107: # Permanently store chatroom entries in chatroom.log
  108: #
  109: # Revision 1.141  2003/09/08 10:32:07  foxr
  110: # Added PushFile sub This sub oversees the push of a new configuration table file
  111: # Currently supported files are:
  112: # - hosts.tab   (transaction pushfile:hosts:contents)
  113: # - domain.tab  (transaction pushfile:domain:contents)
  114: #
  115: 
  116: 
  117: use strict;
  118: use lib '/home/httpd/lib/perl/';
  119: use LONCAPA::Configuration;
  120: 
  121: use IO::Socket;
  122: use IO::File;
  123: #use Apache::File;
  124: use Symbol;
  125: use POSIX;
  126: use Crypt::IDEA;
  127: use LWP::UserAgent();
  128: use GDBM_File;
  129: use Authen::Krb4;
  130: use Authen::Krb5;
  131: use lib '/home/httpd/lib/perl/';
  132: use localauth;
  133: use File::Copy;
  134: 
  135: my $DEBUG = 0;		       # Non zero to enable debug log entries.
  136: 
  137: my $status='';
  138: my $lastlog='';
  139: 
  140: my $VERSION='$Revision: 1.152 $'; #' stupid emacs
  141: my $remoteVERSION;
  142: my $currenthostid;
  143: my $currentdomainid;
  144: 
  145: my $client;
  146: my $clientip;
  147: 
  148: my $server;
  149: my $thisserver;
  150: 
  151: my %hostid;
  152: my %hostdom;
  153: my %hostip;
  154: my %perlvar;			# Will have the apache conf defined perl vars.
  155: 
  156: #
  157: #  The array below are password error strings."
  158: #
  159: my $lastpwderror    = 13;		# Largest error number from lcpasswd.
  160: my @passwderrors = ("ok",
  161: 		   "lcpasswd must be run as user 'www'",
  162: 		   "lcpasswd got incorrect number of arguments",
  163: 		   "lcpasswd did not get the right nubmer of input text lines",
  164: 		   "lcpasswd too many simultaneous pwd changes in progress",
  165: 		   "lcpasswd User does not exist.",
  166: 		   "lcpasswd Incorrect current passwd",
  167: 		   "lcpasswd Unable to su to root.",
  168: 		   "lcpasswd Cannot set new passwd.",
  169: 		   "lcpasswd Username has invalid characters",
  170: 		   "lcpasswd Invalid characters in password",
  171: 		    "11", "12",
  172: 		    "lcpasswd Password mismatch");
  173: 
  174: 
  175: #  The array below are lcuseradd error strings.:
  176: 
  177: my $lastadderror = 13;
  178: my @adderrors    = ("ok",
  179: 		    "User ID mismatch, lcuseradd must run as user www",
  180: 		    "lcuseradd Incorrect number of command line parameters must be 3",
  181: 		    "lcuseradd Incorrect number of stdinput lines, must be 3",
  182: 		    "lcuseradd Too many other simultaneous pwd changes in progress",
  183: 		    "lcuseradd User does not exist",
  184: 		    "lcuseradd Unabel to mak ewww member of users's group",
  185: 		    "lcuseradd Unable to su to root",
  186: 		    "lcuseradd Unable to set password",
  187: 		    "lcuseradd Usrname has invbalid charcters",
  188: 		    "lcuseradd Password has an invalid character",
  189: 		    "lcuseradd User already exists",
  190: 		    "lcuseradd Could not add user.",
  191: 		    "lcuseradd Password mismatch");
  192: 
  193: 
  194: #
  195: #   GetCertificate: Given a transaction that requires a certificate,
  196: #   this function will extract the certificate from the transaction
  197: #   request.  Note that at this point, the only concept of a certificate
  198: #   is the hostname to which we are connected.
  199: #
  200: #   Parameter:
  201: #      request   - The request sent by our client (this parameterization may
  202: #                  need to change when we really use a certificate granting
  203: #                  authority.
  204: #
  205: sub GetCertificate {
  206:     my $request = shift;
  207: 
  208:     return $clientip;
  209: }
  210: 
  211: 
  212: #
  213: #  ValidManager: Determines if a given certificate represents a valid manager.
  214: #                in this primitive implementation, the 'certificate' is
  215: #                just the connecting loncapa client name.  This is checked
  216: #                against a valid client list in the configuration.
  217: #
  218: #                  
  219: sub ValidManager {
  220:     my $certificate = shift; 
  221: 
  222:     my $hostentry   = $hostid{$certificate};
  223:     if ($hostentry ne undef) {
  224: 	&logthis('<font color="yellow">Authenticating manager'.
  225: 		 " $hostentry</font>");
  226: 	return 1;
  227:     } else {
  228: 	&logthis('<font color="red"> Failed manager authentication '.
  229: 		 "$certificate </font>");
  230:     }
  231: }
  232: #
  233: #  CopyFile:  Called as part of the process of installing a 
  234: #             new configuration file.  This function copies an existing
  235: #             file to a backup file.
  236: # Parameters:
  237: #     oldfile  - Name of the file to backup.
  238: #     newfile  - Name of the backup file.
  239: # Return:
  240: #     0   - Failure (errno has failure reason).
  241: #     1   - Success.
  242: #
  243: sub CopyFile {
  244:     my $oldfile = shift;
  245:     my $newfile = shift;
  246: 
  247:     #  The file must exist:
  248: 
  249:     if(-e $oldfile) {
  250: 
  251: 	 # Read the old file.
  252: 
  253: 	my $oldfh = IO::File->new("< $oldfile");
  254: 	if(!$oldfh) {
  255: 	    return 0;
  256: 	}
  257: 	my @contents = <$oldfh>;  # Suck in the entire file.
  258: 
  259: 	# write the backup file:
  260: 
  261: 	my $newfh = IO::File->new("> $newfile");
  262: 	if(!(defined $newfh)){
  263: 	    return 0;
  264: 	}
  265: 	my $lines = scalar @contents;
  266: 	for (my $i =0; $i < $lines; $i++) {
  267: 	    print $newfh ($contents[$i]);
  268: 	}
  269: 
  270: 	$oldfh->close;
  271: 	$newfh->close;
  272: 
  273: 	chmod(0660, $newfile);
  274: 
  275: 	return 1;
  276: 	    
  277:     } else {
  278: 	return 0;
  279:     }
  280: }
  281: 
  282: #
  283: #   InstallFile: Called to install an administrative file:
  284: #       - The file is created with <name>.tmp
  285: #       - The <name>.tmp file is then mv'd to <name>
  286: #   This lugubrious procedure is done to ensure that we are never without
  287: #   a valid, even if dated, version of the file regardless of who crashes
  288: #   and when the crash occurs.
  289: #
  290: #  Parameters:
  291: #       Name of the file
  292: #       File Contents.
  293: #  Return:
  294: #      nonzero - success.
  295: #      0       - failure and $! has an errno.
  296: #
  297: sub InstallFile {
  298:     my $Filename = shift;
  299:     my $Contents = shift;
  300:     my $TempFile = $Filename.".tmp";
  301: 
  302:     #  Open the file for write:
  303: 
  304:     my $fh = IO::File->new("> $TempFile"); # Write to temp.
  305:     if(!(defined $fh)) {
  306: 	&logthis('<font color="red"> Unable to create '.$TempFile."</font>");
  307: 	return 0;
  308:     }
  309:     #  write the contents of the file:
  310: 
  311:     print $fh ($Contents); 
  312:     $fh->close;			# In case we ever have a filesystem w. locking
  313: 
  314:     chmod(0660, $TempFile);
  315: 
  316:     # Now we can move install the file in position.
  317:     
  318:     move($TempFile, $Filename);
  319: 
  320:     return 1;
  321: }
  322: 
  323: #
  324: #   PushFile:  Called to do an administrative push of a file.
  325: #              - Ensure the file being pushed is one we support.
  326: #              - Backup the old file to <filename.saved>
  327: #              - Separate the contents of the new file out from the
  328: #                rest of the request.
  329: #              - Write the new file.
  330: #  Parameter:
  331: #     Request - The entire user request.  This consists of a : separated
  332: #               string pushfile:tablename:contents.
  333: #     NOTE:  The contents may have :'s in it as well making things a bit
  334: #            more interesting... but not much.
  335: #  Returns:
  336: #     String to send to client ("ok" or "refused" if bad file).
  337: #
  338: sub PushFile {
  339:     my $request = shift;    
  340:     my ($command, $filename, $contents) = split(":", $request, 3);
  341:     
  342:     #  At this point in time, pushes for only the following tables are
  343:     #  supported:
  344:     #   hosts.tab  ($filename eq host).
  345:     #   domain.tab ($filename eq domain).
  346:     # Construct the destination filename or reject the request.
  347:     #
  348:     # lonManage is supposed to ensure this, however this session could be
  349:     # part of some elaborate spoof that managed somehow to authenticate.
  350:     #
  351: 
  352:     my $tablefile = $perlvar{'lonTabDir'}.'/'; # need to precede with dir.
  353:     if ($filename eq "host") {
  354: 	$tablefile .= "hosts.tab";
  355:     } elsif ($filename eq "domain") {
  356: 	$tablefile .= "domain.tab";
  357:     } else {
  358: 	return "refused";
  359:     }
  360:     #
  361:     # >copy< the old table to the backup table
  362:     #        don't rename in case system crashes/reboots etc. in the time
  363:     #        window between a rename and write.
  364:     #
  365:     my $backupfile = $tablefile;
  366:     $backupfile    =~ s/\.tab$/.old/;
  367:     if(!CopyFile($tablefile, $backupfile)) {
  368: 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
  369: 	return "error:$!";
  370:     }
  371:     &logthis('<font color="green"> Pushfile: backed up '
  372: 	    .$tablefile." to $backupfile</font>");
  373:     
  374:     #  Install the new file:
  375: 
  376:     if(!InstallFile($tablefile, $contents)) {
  377: 	&logthis('<font color="red"> Pushfile: unable to install '
  378: 	 .$tablefile." $! </font>");
  379: 	return "error:$!";
  380:     }
  381:     else {
  382: 	&logthis('<font color="green"> Installed new '.$tablefile
  383: 		 ."</font>");
  384: 
  385:     }
  386: 
  387: 
  388:     #  Indicate success:
  389:  
  390:     return "ok";
  391: 
  392: }
  393: 
  394: #
  395: #  Called to re-init either lonc or lond.
  396: #
  397: #  Parameters:
  398: #    request   - The full request by the client.  This is of the form
  399: #                reinit:<process>  
  400: #                where <process> is allowed to be either of 
  401: #                lonc or lond
  402: #
  403: #  Returns:
  404: #     The string to be sent back to the client either:
  405: #   ok         - Everything worked just fine.
  406: #   error:why  - There was a failure and why describes the reason.
  407: #
  408: #
  409: sub ReinitProcess {
  410:     my $request = shift;
  411: 
  412: 
  413:     # separate the request (reinit) from the process identifier and
  414:     # validate it producing the name of the .pid file for the process.
  415:     #
  416:     #
  417:     my ($junk, $process) = split(":", $request);
  418:     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
  419:     if($process eq 'lonc') {
  420: 	$processpidfile = $processpidfile."lonc.pid";
  421: 	if (!open(PIDFILE, "< $processpidfile")) {
  422: 	    return "error:Open failed for $processpidfile";
  423: 	}
  424: 	my $loncpid = <PIDFILE>;
  425: 	close(PIDFILE);
  426: 	logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
  427: 		."</font>");
  428: 	kill("USR2", $loncpid);
  429:     } elsif ($process eq 'lond') {
  430: 	logthis('<font color="red"> Reinitializing self (lond) </font>');
  431: 	&UpdateHosts;			# Lond is us!!
  432:     } else {
  433: 	&logthis('<font color="yellow" Invalid reinit request for '.$process
  434: 		 ."</font>");
  435: 	return "error:Invalid process identifier $process";
  436:     }
  437:     return 'ok';
  438: }
  439: 
  440: #
  441: #  Convert an error return code from lcpasswd to a string value.
  442: #
  443: sub lcpasswdstrerror {
  444:     my $ErrorCode = shift;
  445:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
  446: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
  447:     } else {
  448: 	return $passwderrors[$ErrorCode];
  449:     }
  450: }
  451: 
  452: #
  453: # Convert an error return code from lcuseradd to a string value:
  454: #
  455: sub lcuseraddstrerror {
  456:     my $ErrorCode = shift;
  457:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
  458: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
  459:     } else {
  460: 	return $adderrors[$ErrorCode];
  461:     }
  462: }
  463: 
  464: # grabs exception and records it to log before exiting
  465: sub catchexception {
  466:     my ($error)=@_;
  467:     $SIG{'QUIT'}='DEFAULT';
  468:     $SIG{__DIE__}='DEFAULT';
  469:     &logthis("<font color=red>CRITICAL: "
  470:      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
  471:      ."a crash with this error msg->[$error]</font>");
  472:     &logthis('Famous last words: '.$status.' - '.$lastlog);
  473:     if ($client) { print $client "error: $error\n"; }
  474:     $server->close();
  475:     die($error);
  476: }
  477: 
  478: sub timeout {
  479:     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
  480:     &catchexception('Timeout');
  481: }
  482: # -------------------------------- Set signal handlers to record abnormal exits
  483: 
  484: $SIG{'QUIT'}=\&catchexception;
  485: $SIG{__DIE__}=\&catchexception;
  486: 
  487: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
  488: &status("Read loncapa.conf and loncapa_apache.conf");
  489: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
  490: %perlvar=%{$perlvarref};
  491: undef $perlvarref;
  492: 
  493: # ----------------------------- Make sure this process is running from user=www
  494: my $wwwid=getpwnam('www');
  495: if ($wwwid!=$<) {
  496:    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
  497:    my $subj="LON: $currenthostid User ID mismatch";
  498:    system("echo 'User ID mismatch.  lond must be run as user www.' |\
  499:  mailto $emailto -s '$subj' > /dev/null");
  500:    exit 1;
  501: }
  502: 
  503: # --------------------------------------------- Check if other instance running
  504: 
  505: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
  506: 
  507: if (-e $pidfile) {
  508:    my $lfh=IO::File->new("$pidfile");
  509:    my $pide=<$lfh>;
  510:    chomp($pide);
  511:    if (kill 0 => $pide) { die "already running"; }
  512: }
  513: 
  514: # ------------------------------------------------------------- Read hosts file
  515: 
  516: 
  517: 
  518: # establish SERVER socket, bind and listen.
  519: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
  520:                                 Type      => SOCK_STREAM,
  521:                                 Proto     => 'tcp',
  522:                                 Reuse     => 1,
  523:                                 Listen    => 10 )
  524:   or die "making socket: $@\n";
  525: 
  526: # --------------------------------------------------------- Do global variables
  527: 
  528: # global variables
  529: 
  530: my %children               = ();       # keys are current child process IDs
  531: my $children               = 0;        # current number of children
  532: 
  533: sub REAPER {                        # takes care of dead children
  534:     $SIG{CHLD} = \&REAPER;
  535:     my $pid = wait;
  536:     if (defined($children{$pid})) {
  537: 	&logthis("Child $pid died");
  538: 	$children --;
  539: 	delete $children{$pid};
  540:     } else {
  541: 	&logthis("Unknown Child $pid died");
  542:     }
  543: }
  544: 
  545: sub HUNTSMAN {                      # signal handler for SIGINT
  546:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
  547:     kill 'INT' => keys %children;
  548:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
  549:     my $execdir=$perlvar{'lonDaemons'};
  550:     unlink("$execdir/logs/lond.pid");
  551:     &logthis("<font color=red>CRITICAL: Shutting down</font>");
  552:     exit;                           # clean up with dignity
  553: }
  554: 
  555: sub HUPSMAN {                      # signal handler for SIGHUP
  556:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
  557:     kill 'INT' => keys %children;
  558:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
  559:     &logthis("<font color=red>CRITICAL: Restarting</font>");
  560:     my $execdir=$perlvar{'lonDaemons'};
  561:     unlink("$execdir/logs/lond.pid");
  562:     exec("$execdir/lond");         # here we go again
  563: }
  564: 
  565: #
  566: #    Kill off hashes that describe the host table prior to re-reading it.
  567: #    Hashes affected are:
  568: #       %hostid, %hostdom %hostip
  569: #
  570: sub KillHostHashes {
  571:     foreach my $key (keys %hostid) {
  572: 	delete $hostid{$key};
  573:     }
  574:     foreach my $key (keys %hostdom) {
  575: 	delete $hostdom{$key};
  576:     }
  577:     foreach my $key (keys %hostip) {
  578: 	delete $hostip{$key};
  579:     }
  580: }
  581: #
  582: #   Read in the host table from file and distribute it into the various hashes:
  583: #
  584: #    - %hostid  -  Indexed by IP, the loncapa hostname.
  585: #    - %hostdom -  Indexed by  loncapa hostname, the domain.
  586: #    - %hostip  -  Indexed by hostid, the Ip address of the host.
  587: sub ReadHostTable {
  588: 
  589:     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
  590:     
  591:     while (my $configline=<CONFIG>) {
  592: 	my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
  593: 	chomp($ip); $ip=~s/\D+$//;
  594: 	$hostid{$ip}=$id;
  595: 	$hostdom{$id}=$domain;
  596: 	$hostip{$id}=$ip;
  597: 	if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
  598:     }
  599:     close(CONFIG);
  600: }
  601: #
  602: #  Reload the Apache daemon's state.
  603: #  This is done by invoking /home/httpd/perl/apachereload
  604: #  a setuid perl script that can be root for us to do this job.
  605: #
  606: sub ReloadApache {
  607:     my $execdir = $perlvar{'lonDaemons'};
  608:     my $script  = $execdir."/apachereload";
  609:     system($script);
  610: }
  611: 
  612: #
  613: #   Called in response to a USR2 signal.
  614: #   - Reread hosts.tab
  615: #   - All children connected to hosts that were removed from hosts.tab
  616: #     are killed via SIGINT
  617: #   - All children connected to previously existing hosts are sent SIGUSR1
  618: #   - Our internal hosts hash is updated to reflect the new contents of
  619: #     hosts.tab causing connections from hosts added to hosts.tab to
  620: #     now be honored.
  621: #
  622: sub UpdateHosts {
  623:     logthis('<font color="blue"> Updating connections </font>');
  624:     #
  625:     #  The %children hash has the set of IP's we currently have children
  626:     #  on.  These need to be matched against records in the hosts.tab
  627:     #  Any ip's no longer in the table get killed off they correspond to
  628:     #  either dropped or changed hosts.  Note that the re-read of the table
  629:     #  will take care of new and changed hosts as connections come into being.
  630: 
  631: 
  632:     KillHostHashes;
  633:     ReadHostTable;
  634: 
  635:     foreach my $child (keys %children) {
  636: 	my $childip = $children{$child};
  637: 	if(!$hostid{$childip}) {
  638: 	    logthis('<font color="blue"> UpdateHosts killing child '
  639: 		    ." $child for ip $childip </font>");
  640: 	    kill('INT', $child);
  641: 	} else {
  642: 	    logthis('<font color="green"> keeping child for ip '
  643: 		    ." $childip (pid=$child) </font>");
  644: 	}
  645:     }
  646:     ReloadApache;
  647: }
  648: 
  649: 
  650: sub checkchildren {
  651:     &initnewstatus();
  652:     &logstatus();
  653:     &logthis('Going to check on the children');
  654:     my $docdir=$perlvar{'lonDocRoot'};
  655:     foreach (sort keys %children) {
  656: 	sleep 1;
  657:         unless (kill 'USR1' => $_) {
  658: 	    &logthis ('Child '.$_.' is dead');
  659:             &logstatus($$.' is dead');
  660:         } 
  661:     }
  662:     sleep 5;
  663:     $SIG{ALRM} = sub { die "timeout" };
  664:     $SIG{__DIE__} = 'DEFAULT';
  665:     foreach (sort keys %children) {
  666:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
  667:           eval {
  668:             alarm(300);
  669: 	    &logthis('Child '.$_.' did not respond');
  670: 	    kill 9 => $_;
  671: 	    #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
  672: 	    #$subj="LON: $currenthostid killed lond process $_";
  673: 	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
  674: 	    #$execdir=$perlvar{'lonDaemons'};
  675: 	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
  676: 	    alarm(0);
  677: 	  }
  678:         }
  679:     }
  680:     $SIG{ALRM} = 'DEFAULT';
  681:     $SIG{__DIE__} = \&catchcexception;
  682: }
  683: 
  684: # --------------------------------------------------------------------- Logging
  685: 
  686: sub logthis {
  687:     my $message=shift;
  688:     my $execdir=$perlvar{'lonDaemons'};
  689:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
  690:     my $now=time;
  691:     my $local=localtime($now);
  692:     $lastlog=$local.': '.$message;
  693:     print $fh "$local ($$): $message\n";
  694: }
  695: 
  696: # ------------------------- Conditional log if $DEBUG true.
  697: sub Debug {
  698:     my $message = shift;
  699:     if($DEBUG) {
  700: 	&logthis($message);
  701:     }
  702: }
  703: # ------------------------------------------------------------------ Log status
  704: 
  705: sub logstatus {
  706:     my $docdir=$perlvar{'lonDocRoot'};
  707:     {
  708:     my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
  709:     print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";
  710:     $fh->close();
  711:     }
  712:     {
  713: 	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
  714:         print $fh $status."\n".$lastlog."\n".time;
  715:         $fh->close();
  716:     }
  717: }
  718: 
  719: sub initnewstatus {
  720:     my $docdir=$perlvar{'lonDocRoot'};
  721:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
  722:     my $now=time;
  723:     my $local=localtime($now);
  724:     print $fh "LOND status $local - parent $$\n\n";
  725:     opendir(DIR,"$docdir/lon-status/londchld");
  726:     while (my $filename=readdir(DIR)) {
  727:         unlink("$docdir/lon-status/londchld/$filename");
  728:     }
  729:     closedir(DIR);
  730: }
  731: 
  732: # -------------------------------------------------------------- Status setting
  733: 
  734: sub status {
  735:     my $what=shift;
  736:     my $now=time;
  737:     my $local=localtime($now);
  738:     $status=$local.': '.$what;
  739:     $0='lond: '.$what.' '.$local;
  740: }
  741: 
  742: # -------------------------------------------------------- Escape Special Chars
  743: 
  744: sub escape {
  745:     my $str=shift;
  746:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
  747:     return $str;
  748: }
  749: 
  750: # ----------------------------------------------------- Un-Escape Special Chars
  751: 
  752: sub unescape {
  753:     my $str=shift;
  754:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
  755:     return $str;
  756: }
  757: 
  758: # ----------------------------------------------------------- Send USR1 to lonc
  759: 
  760: sub reconlonc {
  761:     my $peerfile=shift;
  762:     &logthis("Trying to reconnect for $peerfile");
  763:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
  764:     if (my $fh=IO::File->new("$loncfile")) {
  765: 	my $loncpid=<$fh>;
  766:         chomp($loncpid);
  767:         if (kill 0 => $loncpid) {
  768: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
  769:             kill USR1 => $loncpid;
  770:         } else {
  771: 	    &logthis(
  772:               "<font color=red>CRITICAL: "
  773:              ."lonc at pid $loncpid not responding, giving up</font>");
  774:         }
  775:     } else {
  776:       &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
  777:     }
  778: }
  779: 
  780: # -------------------------------------------------- Non-critical communication
  781: 
  782: sub subreply {
  783:     my ($cmd,$server)=@_;
  784:     my $peerfile="$perlvar{'lonSockDir'}/$server";
  785:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
  786:                                       Type    => SOCK_STREAM,
  787:                                       Timeout => 10)
  788:        or return "con_lost";
  789:     print $sclient "$cmd\n";
  790:     my $answer=<$sclient>;
  791:     chomp($answer);
  792:     if (!$answer) { $answer="con_lost"; }
  793:     return $answer;
  794: }
  795: 
  796: sub reply {
  797:   my ($cmd,$server)=@_;
  798:   my $answer;
  799:   if ($server ne $currenthostid) { 
  800:     $answer=subreply($cmd,$server);
  801:     if ($answer eq 'con_lost') {
  802: 	$answer=subreply("ping",$server);
  803:         if ($answer ne $server) {
  804: 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
  805:            &reconlonc("$perlvar{'lonSockDir'}/$server");
  806:         }
  807:         $answer=subreply($cmd,$server);
  808:     }
  809:   } else {
  810:     $answer='self_reply';
  811:   } 
  812:   return $answer;
  813: }
  814: 
  815: # -------------------------------------------------------------- Talk to lonsql
  816: 
  817: sub sqlreply {
  818:     my ($cmd)=@_;
  819:     my $answer=subsqlreply($cmd);
  820:     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
  821:     return $answer;
  822: }
  823: 
  824: sub subsqlreply {
  825:     my ($cmd)=@_;
  826:     my $unixsock="mysqlsock";
  827:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
  828:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
  829:                                       Type    => SOCK_STREAM,
  830:                                       Timeout => 10)
  831:        or return "con_lost";
  832:     print $sclient "$cmd\n";
  833:     my $answer=<$sclient>;
  834:     chomp($answer);
  835:     if (!$answer) { $answer="con_lost"; }
  836:     return $answer;
  837: }
  838: 
  839: # -------------------------------------------- Return path to profile directory
  840: 
  841: sub propath {
  842:     my ($udom,$uname)=@_;
  843:     $udom=~s/\W//g;
  844:     $uname=~s/\W//g;
  845:     my $subdir=$uname.'__';
  846:     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
  847:     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
  848:     return $proname;
  849: } 
  850: 
  851: # --------------------------------------- Is this the home server of an author?
  852: 
  853: sub ishome {
  854:     my $author=shift;
  855:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
  856:     my ($udom,$uname)=split(/\//,$author);
  857:     my $proname=propath($udom,$uname);
  858:     if (-e $proname) {
  859: 	return 'owner';
  860:     } else {
  861:         return 'not_owner';
  862:     }
  863: }
  864: 
  865: # ======================================================= Continue main program
  866: # ---------------------------------------------------- Fork once and dissociate
  867: 
  868: my $fpid=fork;
  869: exit if $fpid;
  870: die "Couldn't fork: $!" unless defined ($fpid);
  871: 
  872: POSIX::setsid() or die "Can't start new session: $!";
  873: 
  874: # ------------------------------------------------------- Write our PID on disk
  875: 
  876: my $execdir=$perlvar{'lonDaemons'};
  877: open (PIDSAVE,">$execdir/logs/lond.pid");
  878: print PIDSAVE "$$\n";
  879: close(PIDSAVE);
  880: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
  881: &status('Starting');
  882: 
  883: 
  884: 
  885: # ----------------------------------------------------- Install signal handlers
  886: 
  887: 
  888: $SIG{CHLD} = \&REAPER;
  889: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
  890: $SIG{HUP}  = \&HUPSMAN;
  891: $SIG{USR1} = \&checkchildren;
  892: $SIG{USR2} = \&UpdateHosts;
  893: 
  894: #  Read the host hashes:
  895: 
  896: ReadHostTable;
  897: 
  898: # --------------------------------------------------------------
  899: #   Accept connections.  When a connection comes in, it is validated
  900: #   and if good, a child process is created to process transactions
  901: #   along the connection.
  902: 
  903: while (1) {
  904:     $client = $server->accept() or next;
  905:     make_new_child($client);
  906: }
  907: 
  908: sub make_new_child {
  909:     my $pid;
  910:     my $cipher;
  911:     my $sigset;
  912: 
  913:     $client = shift;
  914:     &logthis("Attempting to start child");    
  915:     # block signal for fork
  916:     $sigset = POSIX::SigSet->new(SIGINT);
  917:     sigprocmask(SIG_BLOCK, $sigset)
  918:         or die "Can't block SIGINT for fork: $!\n";
  919: 
  920:     die "fork: $!" unless defined ($pid = fork);
  921: 
  922:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
  923: 	                               # connection liveness.
  924: 
  925:     #
  926:     #  Figure out who we're talking to so we can record the peer in 
  927:     #  the pid hash.
  928:     #
  929:     my $caller = getpeername($client);
  930:     my ($port,$iaddr)=unpack_sockaddr_in($caller);
  931:     $clientip=inet_ntoa($iaddr);
  932:     
  933:     if ($pid) {
  934:         # Parent records the child's birth and returns.
  935:         sigprocmask(SIG_UNBLOCK, $sigset)
  936:             or die "Can't unblock SIGINT for fork: $!\n";
  937:         $children{$pid} = $clientip;
  938:         $children++;
  939:         &status('Started child '.$pid);
  940:         return;
  941:     } else {
  942:         # Child can *not* return from this subroutine.
  943:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
  944:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
  945:                                 #don't get intercepted
  946:         $SIG{USR1}= \&logstatus;
  947:         $SIG{ALRM}= \&timeout;
  948:         $lastlog='Forked ';
  949:         $status='Forked';
  950: 
  951:         # unblock signals
  952:         sigprocmask(SIG_UNBLOCK, $sigset)
  953:             or die "Can't unblock SIGINT for fork: $!\n";
  954: 
  955:         my $tmpsnum=0;
  956: #---------------------------------------------------- kerberos 5 initialization
  957:         &Authen::Krb5::init_context();
  958:         &Authen::Krb5::init_ets();
  959: 
  960:             &status('Accepted connection');
  961: # =============================================================================
  962:             # do something with the connection
  963: # -----------------------------------------------------------------------------
  964: 	# see if we know client and check for spoof IP by challenge
  965: 
  966:             my $clientrec=($hostid{$clientip} ne undef);
  967:             &logthis(
  968: "<font color=yellow>INFO: Connection, $clientip ($hostid{$clientip})</font>"
  969:             );
  970:             &status("Connecting $clientip ($hostid{$clientip})"); 
  971:             my $clientok;
  972:             if ($clientrec) {
  973: 	      &status("Waiting for init from $clientip ($hostid{$clientip})");
  974: 	      my $remotereq=<$client>;
  975:               $remotereq=~s/[^\w:]//g;
  976:               if ($remotereq =~ /^init/) {
  977: 		  &sethost("sethost:$perlvar{'lonHostID'}");
  978: 		  my $challenge="$$".time;
  979:                   print $client "$challenge\n";
  980:                   &status(
  981:            "Waiting for challenge reply from $clientip ($hostid{$clientip})"); 
  982:                   $remotereq=<$client>;
  983:                   $remotereq=~s/\W//g;
  984:                   if ($challenge eq $remotereq) {
  985: 		      $clientok=1;
  986:                       print $client "ok\n";
  987:                   } else {
  988: 		      &logthis(
  989:  "<font color=blue>WARNING: $clientip did not reply challenge</font>");
  990:                       &status('No challenge reply '.$clientip);
  991:                   }
  992:               } else {
  993: 		  &logthis(
  994:                     "<font color=blue>WARNING: "
  995:                    ."$clientip failed to initialize: >$remotereq< </font>");
  996:                   &status('No init '.$clientip);
  997:               }
  998: 	    } else {
  999:               &logthis(
 1000:  "<font color=blue>WARNING: Unknown client $clientip</font>");
 1001:               &status('Hung up on '.$clientip);
 1002:             }
 1003:             if ($clientok) {
 1004: # ---------------- New known client connecting, could mean machine online again
 1005: 
 1006: 		foreach my $id (keys(%hostip)) {
 1007: 		    if ($hostip{$id} ne $clientip ||
 1008: 		       $hostip{$currenthostid} eq $clientip) {
 1009: 			# no need to try to do recon's to myself
 1010: 			next;
 1011: 		    }
 1012: 		    &reconlonc("$perlvar{'lonSockDir'}/$id");
 1013: 		}
 1014: 		&logthis("<font color=green>Established connection: $hostid{$clientip}</font>");
 1015:               &status('Will listen to '.$hostid{$clientip});
 1016: # ------------------------------------------------------------ Process requests
 1017:               while (my $userinput=<$client>) {
 1018:                 chomp($userinput);
 1019: 		Debug("Request = $userinput\n");
 1020:                 &status('Processing '.$hostid{$clientip}.': '.$userinput);
 1021:                 my $wasenc=0;
 1022:                 alarm(120);
 1023: # ------------------------------------------------------------ See if encrypted
 1024: 		if ($userinput =~ /^enc/) {
 1025: 		  if ($cipher) {
 1026:                     my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
 1027: 		    $userinput='';
 1028:                     for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
 1029:                        $userinput.=
 1030: 			   $cipher->decrypt(
 1031:                             pack("H16",substr($encinput,$encidx,16))
 1032:                            );
 1033: 		    }
 1034: 		    $userinput=substr($userinput,0,$cmdlength);
 1035:                     $wasenc=1;
 1036: 		}
 1037: 	      }
 1038: 	  
 1039: # ------------------------------------------------------------- Normal commands
 1040: # ------------------------------------------------------------------------ ping
 1041: 		   if ($userinput =~ /^ping/) {
 1042:                        print $client "$currenthostid\n";
 1043: # ------------------------------------------------------------------------ pong
 1044: 		   }elsif ($userinput =~ /^pong/) {
 1045:                        my $reply=&reply("ping",$hostid{$clientip});
 1046:                        print $client "$currenthostid:$reply\n"; 
 1047: # ------------------------------------------------------------------------ ekey
 1048: 		   } elsif ($userinput =~ /^ekey/) {
 1049:                        my $buildkey=time.$$.int(rand 100000);
 1050:                        $buildkey=~tr/1-6/A-F/;
 1051:                        $buildkey=int(rand 100000).$buildkey.int(rand 100000);
 1052:                        my $key=$currenthostid.$hostid{$clientip};
 1053:                        $key=~tr/a-z/A-Z/;
 1054:                        $key=~tr/G-P/0-9/;
 1055:                        $key=~tr/Q-Z/0-9/;
 1056:                        $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
 1057:                        $key=substr($key,0,32);
 1058:                        my $cipherkey=pack("H32",$key);
 1059:                        $cipher=new IDEA $cipherkey;
 1060:                        print $client "$buildkey\n"; 
 1061: # ------------------------------------------------------------------------ load
 1062: 		   } elsif ($userinput =~ /^load/) {
 1063:                        my $loadavg;
 1064:                        {
 1065:                           my $loadfile=IO::File->new('/proc/loadavg');
 1066:                           $loadavg=<$loadfile>;
 1067:                        }
 1068:                        $loadavg =~ s/\s.*//g;
 1069: 		       my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
 1070: 		       print $client "$loadpercent\n";
 1071: # -------------------------------------------------------------------- userload
 1072: 		   } elsif ($userinput =~ /^userload/) {
 1073: 		       my $userloadpercent=&userload();
 1074: 		       print $client "$userloadpercent\n";
 1075: 
 1076: #
 1077: #        Transactions requiring encryption:
 1078: #
 1079: # ----------------------------------------------------------------- currentauth
 1080: 		   } elsif ($userinput =~ /^currentauth/) {
 1081: 		     if ($wasenc==1) {
 1082:                        my ($cmd,$udom,$uname)=split(/:/,$userinput);
 1083: 		       my $result = GetAuthType($udom, $uname);
 1084: 		       if($result eq "nouser") {
 1085: 			   print $client "unknown_user\n";
 1086: 		       }
 1087: 		       else {
 1088: 			   print $client "$result\n"
 1089: 		       }
 1090: 		     } else {
 1091: 		       print $client "refused\n";
 1092: 		     }
 1093: #--------------------------------------------------------------------- pushfile
 1094: 		   } elsif($userinput =~ /^pushfile/) { 
 1095: 		       if($wasenc == 1) {
 1096: 			   my $cert = GetCertificate($userinput);
 1097: 			   if(ValidManager($cert)) {
 1098: 			       my $reply = PushFile($userinput);
 1099: 			       print $client "$reply\n";
 1100: 			   } else {
 1101: 			       print $client "refused\n";
 1102: 			   } 
 1103: 		       } else {
 1104: 			   print $client "refused\n";
 1105: 		       }
 1106: #--------------------------------------------------------------------- reinit
 1107: 		   } elsif($userinput =~ /^reinit/) {
 1108: 		       if ($wasenc == 1) {
 1109: 			   my $cert = GetCertificate($userinput);
 1110: 			   if(ValidManager($cert)) {
 1111: 			       chomp($userinput);
 1112: 			       my $reply = ReinitProcess($userinput);
 1113: 			       print $client  "$reply\n";
 1114: 			   } else {
 1115: 			       print $client "refused\n";
 1116: 			   }
 1117: 		       } else {
 1118: 			   print $client "refused\n";
 1119: 		       }
 1120: # ------------------------------------------------------------------------ auth
 1121:                    } elsif ($userinput =~ /^auth/) {
 1122: 		     if ($wasenc==1) {
 1123:                        my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
 1124:                        chomp($upass);
 1125:                        $upass=unescape($upass);
 1126:                        my $proname=propath($udom,$uname);
 1127:                        my $passfilename="$proname/passwd";
 1128:                        if (-e $passfilename) {
 1129:                           my $pf = IO::File->new($passfilename);
 1130:                           my $realpasswd=<$pf>;
 1131:                           chomp($realpasswd);
 1132:                           my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
 1133:                           my $pwdcorrect=0;
 1134:                           if ($howpwd eq 'internal') {
 1135: 			      &Debug("Internal auth");
 1136: 			      $pwdcorrect=
 1137: 				  (crypt($upass,$contentpwd) eq $contentpwd);
 1138:                           } elsif ($howpwd eq 'unix') {
 1139: 			      &Debug("Unix auth");
 1140:                               if((getpwnam($uname))[1] eq "") { #no such user!
 1141: 				  $pwdcorrect = 0;
 1142: 			      } else {
 1143: 				  $contentpwd=(getpwnam($uname))[1];
 1144: 				  my $pwauth_path="/usr/local/sbin/pwauth";
 1145: 				  unless ($contentpwd eq 'x') {
 1146: 				      $pwdcorrect=
 1147: 					  (crypt($upass,$contentpwd) eq 
 1148: 					   $contentpwd);
 1149: 				  }
 1150: 		  
 1151: 			      elsif (-e $pwauth_path) {
 1152: 				  open PWAUTH, "|$pwauth_path" or
 1153: 				      die "Cannot invoke authentication";
 1154: 				  print PWAUTH "$uname\n$upass\n";
 1155: 				  close PWAUTH;
 1156: 				  $pwdcorrect=!$?;
 1157: 			      }
 1158: 			      }
 1159:                           } elsif ($howpwd eq 'krb4') {
 1160:                               my $null=pack("C",0);
 1161:                               unless ($upass=~/$null/) {
 1162:                                   my $krb4_error = &Authen::Krb4::get_pw_in_tkt
 1163:                                       ($uname,"",$contentpwd,'krbtgt',
 1164:                                        $contentpwd,1,$upass);
 1165:                                   if (!$krb4_error) {
 1166:                                       $pwdcorrect = 1;
 1167:                                   } else { 
 1168:                                       $pwdcorrect=0; 
 1169:                                       # log error if it is not a bad password
 1170:                                       if ($krb4_error != 62) {
 1171:        &logthis('krb4:'.$uname.','.$contentpwd.','.
 1172:                 &Authen::Krb4::get_err_txt($Authen::Krb4::error));
 1173:                                       }
 1174:                                   }
 1175:                               }
 1176:                           } elsif ($howpwd eq 'krb5') {
 1177: 			      my $null=pack("C",0);
 1178: 			      unless ($upass=~/$null/) {
 1179: 				  my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
 1180: 				  my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
 1181: 				  my $krbserver=&Authen::Krb5::parse_name($krbservice);
 1182: 				  my $credentials=&Authen::Krb5::cc_default();
 1183: 				  $credentials->initialize($krbclient);
 1184: 				  my $krbreturn = 
 1185: 				    &Authen::Krb5::get_in_tkt_with_password(
 1186: 				     $krbclient,$krbserver,$upass,$credentials);
 1187: #				  unless ($krbreturn) {
 1188: #				      &logthis("Krb5 Error: ".
 1189: #					       &Authen::Krb5::error());
 1190: #				  }
 1191: 				  $pwdcorrect = ($krbreturn == 1);
 1192: 			   } else { $pwdcorrect=0; }
 1193:                           } elsif ($howpwd eq 'localauth') {
 1194: 			    $pwdcorrect=&localauth::localauth($uname,$upass,
 1195: 							      $contentpwd);
 1196: 			  }
 1197:                           if ($pwdcorrect) {
 1198:                              print $client "authorized\n";
 1199:                           } else {
 1200:                              print $client "non_authorized\n";
 1201:                           }  
 1202: 		       } else {
 1203:                           print $client "unknown_user\n";
 1204:                        }
 1205: 		     } else {
 1206: 		       print $client "refused\n";
 1207: 		     }
 1208: # ---------------------------------------------------------------------- passwd
 1209:                    } elsif ($userinput =~ /^passwd/) {
 1210: 		     if ($wasenc==1) {
 1211:                        my 
 1212:                        ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
 1213:                        chomp($npass);
 1214:                        $upass=&unescape($upass);
 1215:                        $npass=&unescape($npass);
 1216: 		       &Debug("Trying to change password for $uname");
 1217: 		       my $proname=propath($udom,$uname);
 1218:                        my $passfilename="$proname/passwd";
 1219:                        if (-e $passfilename) {
 1220: 			   my $realpasswd;
 1221:                           { my $pf = IO::File->new($passfilename);
 1222: 			    $realpasswd=<$pf>; }
 1223:                           chomp($realpasswd);
 1224:                           my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
 1225:                           if ($howpwd eq 'internal') {
 1226: 			   &Debug("internal auth");
 1227: 			   if (crypt($upass,$contentpwd) eq $contentpwd) {
 1228: 			     my $salt=time;
 1229:                              $salt=substr($salt,6,2);
 1230: 			     my $ncpass=crypt($npass,$salt);
 1231:                              {
 1232: 				 my $pf;
 1233: 				 if ($pf = IO::File->new(">$passfilename")) {
 1234: 				     print $pf "internal:$ncpass\n";
 1235: 				     &logthis("Result of password change for $uname: pwchange_success");
 1236: 				     print $client "ok\n";
 1237: 				 } else {
 1238: 				     &logthis("Unable to open $uname passwd to change password");
 1239: 				     print $client "non_authorized\n";
 1240: 				 }
 1241: 			     }             
 1242: 			     
 1243:                            } else {
 1244:                              print $client "non_authorized\n";
 1245:                            }
 1246:                           } elsif ($howpwd eq 'unix') {
 1247: 			      # Unix means we have to access /etc/password
 1248: 			      # one way or another.
 1249: 			      # First: Make sure the current password is
 1250: 			      #        correct
 1251: 			      &Debug("auth is unix");
 1252: 			      $contentpwd=(getpwnam($uname))[1];
 1253: 			      my $pwdcorrect = "0";
 1254: 			      my $pwauth_path="/usr/local/sbin/pwauth";
 1255: 			      unless ($contentpwd eq 'x') {
 1256: 				  $pwdcorrect=
 1257:                                     (crypt($upass,$contentpwd) eq $contentpwd);
 1258: 			      } elsif (-e $pwauth_path) {
 1259: 				  open PWAUTH, "|$pwauth_path" or
 1260: 				      die "Cannot invoke authentication";
 1261: 				  print PWAUTH "$uname\n$upass\n";
 1262: 				  close PWAUTH;
 1263: 				  &Debug("exited pwauth with $? ($uname,$upass) ");
 1264: 				  $pwdcorrect=($? == 0);
 1265: 			      }
 1266: 			     if ($pwdcorrect) {
 1267: 				 my $execdir=$perlvar{'lonDaemons'};
 1268: 				 &Debug("Opening lcpasswd pipeline");
 1269: 				 my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
 1270: 				 print $pf "$uname\n$npass\n$npass\n";
 1271: 				 close $pf;
 1272: 				 my $err = $?;
 1273: 				 my $result = ($err>0 ? 'pwchange_failure' 
 1274: 					       : 'ok');
 1275: 				 &logthis("Result of password change for $uname: ".
 1276: 					  &lcpasswdstrerror($?));
 1277: 				 print $client "$result\n";
 1278: 			     } else {
 1279: 				 print $client "non_authorized\n";
 1280: 			     }
 1281: 			  } else {
 1282:                             print $client "auth_mode_error\n";
 1283:                           }  
 1284: 		       } else {
 1285:                           print $client "unknown_user\n";
 1286:                        }
 1287: 		     } else {
 1288: 		       print $client "refused\n";
 1289: 		     }
 1290: # -------------------------------------------------------------------- makeuser
 1291:                    } elsif ($userinput =~ /^makeuser/) {
 1292: 		     &Debug("Make user received");
 1293:     	             my $oldumask=umask(0077);
 1294: 		     if ($wasenc==1) {
 1295:                        my 
 1296:                        ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
 1297: 		       &Debug("cmd =".$cmd." $udom =".$udom.
 1298: 				    " uname=".$uname);
 1299:                        chomp($npass);
 1300:                        $npass=&unescape($npass);
 1301:                        my $proname=propath($udom,$uname);
 1302:                        my $passfilename="$proname/passwd";
 1303: 		       &Debug("Password file created will be:".
 1304: 				    $passfilename);
 1305:                        if (-e $passfilename) {
 1306: 			   print $client "already_exists\n";
 1307:                        } elsif ($udom ne $currentdomainid) {
 1308:                            print $client "not_right_domain\n";
 1309:                        } else {
 1310:                            my @fpparts=split(/\//,$proname);
 1311:                            my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
 1312:                            my $fperror='';
 1313:                            for (my $i=3;$i<=$#fpparts;$i++) {
 1314:                                $fpnow.='/'.$fpparts[$i]; 
 1315:                                unless (-e $fpnow) {
 1316: 				   unless (mkdir($fpnow,0777)) {
 1317:                                       $fperror="error: ".($!+0)
 1318: 					  ." mkdir failed while attempting "
 1319:                                               ."makeuser\n";
 1320:                                    }
 1321:                                }
 1322:                            }
 1323:                            unless ($fperror) {
 1324: 			       my $result=&make_passwd_file($uname, $umode,$npass,
 1325: 							    $passfilename);
 1326: 			       print $client $result;
 1327:                            } else {
 1328:                                print $client "$fperror\n";
 1329:                            }
 1330:                        }
 1331: 		     } else {
 1332: 		       print $client "refused\n";
 1333: 		     }
 1334: 		     umask($oldumask);
 1335: # -------------------------------------------------------------- changeuserauth
 1336:                    } elsif ($userinput =~ /^changeuserauth/) {
 1337: 		       &Debug("Changing authorization");
 1338: 		      if ($wasenc==1) {
 1339:                        my 
 1340: 		       ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
 1341:                        chomp($npass);
 1342: 		       &Debug("cmd = ".$cmd." domain= ".$udom.
 1343: 			      "uname =".$uname." umode= ".$umode);
 1344:                        $npass=&unescape($npass);
 1345:                        my $proname=&propath($udom,$uname);
 1346:                        my $passfilename="$proname/passwd";
 1347: 		       if ($udom ne $currentdomainid) {
 1348:                            print $client "not_right_domain\n";
 1349:                        } else {
 1350: 			   my $result=&make_passwd_file($uname, $umode,$npass,
 1351: 							$passfilename);
 1352: 			   print $client $result;
 1353:                        }
 1354: 		     } else {
 1355: 		       print $client "refused\n";
 1356: 		     }
 1357: # ------------------------------------------------------------------------ home
 1358:                    } elsif ($userinput =~ /^home/) {
 1359:                        my ($cmd,$udom,$uname)=split(/:/,$userinput);
 1360:                        chomp($uname);
 1361:                        my $proname=propath($udom,$uname);
 1362:                        if (-e $proname) {
 1363:                           print $client "found\n";
 1364:                        } else {
 1365: 			  print $client "not_found\n";
 1366:                        }
 1367: # ---------------------------------------------------------------------- update
 1368:                    } elsif ($userinput =~ /^update/) {
 1369:                        my ($cmd,$fname)=split(/:/,$userinput);
 1370:                        my $ownership=ishome($fname);
 1371:                        if ($ownership eq 'not_owner') {
 1372:                         if (-e $fname) {
 1373:                           my ($dev,$ino,$mode,$nlink,
 1374:                               $uid,$gid,$rdev,$size,
 1375:                               $atime,$mtime,$ctime,
 1376:                               $blksize,$blocks)=stat($fname);
 1377:                           my $now=time;
 1378:                           my $since=$now-$atime;
 1379:                           if ($since>$perlvar{'lonExpire'}) {
 1380:                               my $reply=
 1381:                                     &reply("unsub:$fname","$hostid{$clientip}");
 1382:                               unlink("$fname");
 1383:                           } else {
 1384: 			     my $transname="$fname.in.transfer";
 1385:                              my $remoteurl=
 1386:                                     reply("sub:$fname","$hostid{$clientip}");
 1387:                              my $response;
 1388:                               {
 1389:                              my $ua=new LWP::UserAgent;
 1390:                              my $request=new HTTP::Request('GET',"$remoteurl");
 1391:                              $response=$ua->request($request,$transname);
 1392: 			      }
 1393:                              if ($response->is_error()) {
 1394: 				 unlink($transname);
 1395:                                  my $message=$response->status_line;
 1396:                                  &logthis(
 1397:                                   "LWP GET: $message for $fname ($remoteurl)");
 1398:                              } else {
 1399: 	                         if ($remoteurl!~/\.meta$/) {
 1400:                                   my $ua=new LWP::UserAgent;
 1401:                                   my $mrequest=
 1402:                                    new HTTP::Request('GET',$remoteurl.'.meta');
 1403:                                   my $mresponse=
 1404:                                    $ua->request($mrequest,$fname.'.meta');
 1405:                                   if ($mresponse->is_error()) {
 1406: 		                    unlink($fname.'.meta');
 1407:                                   }
 1408: 	                         }
 1409:                                  rename($transname,$fname);
 1410: 			     }
 1411:                           }
 1412:                           print $client "ok\n";
 1413:                         } else {
 1414:                           print $client "not_found\n";
 1415:                         }
 1416: 		       } else {
 1417: 			print $client "rejected\n";
 1418:                        }
 1419: # -------------------------------------- fetch a user file from a remote server
 1420:                    } elsif ($userinput =~ /^fetchuserfile/) {
 1421: 		       my ($cmd,$fname)=split(/:/,$userinput);
 1422: 		       my ($udom,$uname,$ufile)=split(/\//,$fname);
 1423: 		       my $udir=propath($udom,$uname).'/userfiles';
 1424: 		       unless (-e $udir) { mkdir($udir,0770); }
 1425:                        if (-e $udir) {
 1426: 			   $ufile=~s/^[\.\~]+//;
 1427: 			   $ufile=~s/\///g;
 1428: 			   my $destname=$udir.'/'.$ufile;
 1429: 			   my $transname=$udir.'/'.$ufile.'.in.transit';
 1430: 			   my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
 1431: 			   my $response;
 1432: 			   {
 1433: 			       my $ua=new LWP::UserAgent;
 1434: 			       my $request=new HTTP::Request('GET',"$remoteurl");
 1435: 			       $response=$ua->request($request,$transname);
 1436: 			   }
 1437: 			   if ($response->is_error()) {
 1438: 			       unlink($transname);
 1439: 			       my $message=$response->status_line;
 1440: 			       &logthis("LWP GET: $message for $fname ($remoteurl)");
 1441: 			       print $client "failed\n";
 1442: 			   } else {
 1443: 			       if (!rename($transname,$destname)) {
 1444: 				   &logthis("Unable to move $transname to $destname");
 1445: 				   unlink($transname);
 1446: 				   print $client "failed\n";
 1447: 			       } else {
 1448: 				   print $client "ok\n";
 1449: 			       }
 1450: 			   }
 1451: 		       } else {
 1452: 			   print $client "not_home\n";
 1453: 		       }
 1454: # ------------------------------------------ authenticate access to a user file
 1455:                    } elsif ($userinput =~ /^tokenauthuserfile/) {
 1456:                        my ($cmd,$fname,$session)=split(/:/,$userinput);
 1457:                        chomp($session);
 1458:                        my $reply='non_auth';
 1459:                        if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
 1460: 				$session.'.id')) {
 1461: 			   while (my $line=<ENVIN>) {
 1462: 			       if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
 1463: 			   }
 1464: 			   close(ENVIN);
 1465: 			   print $client $reply."\n";
 1466: 		       } else {
 1467: 			   print $client "invalid_token\n";
 1468:                        }
 1469: # ----------------------------------------------------------------- unsubscribe
 1470:                    } elsif ($userinput =~ /^unsub/) {
 1471:                        my ($cmd,$fname)=split(/:/,$userinput);
 1472:                        if (-e $fname) {
 1473: 			   print $client &unsub($client,$fname,$clientip);
 1474:                        } else {
 1475: 			   print $client "not_found\n";
 1476:                        }
 1477: # ------------------------------------------------------------------- subscribe
 1478:                    } elsif ($userinput =~ /^sub/) {
 1479: 		       print $client &subscribe($userinput,$clientip);
 1480: # ------------------------------------------------------------- current version
 1481:                    } elsif ($userinput =~ /^currentversion/) {
 1482:                        my ($cmd,$fname)=split(/:/,$userinput);
 1483: 		       print $client &currentversion($fname)."\n";
 1484: # ------------------------------------------------------------------------- log
 1485:                    } elsif ($userinput =~ /^log/) {
 1486:                        my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
 1487:                        chomp($what);
 1488:                        my $proname=propath($udom,$uname);
 1489:                        my $now=time;
 1490:                        {
 1491: 			 my $hfh;
 1492: 			 if ($hfh=IO::File->new(">>$proname/activity.log")) { 
 1493:                             print $hfh "$now:$hostid{$clientip}:$what\n";
 1494:                             print $client "ok\n"; 
 1495: 			} else {
 1496:                             print $client "error: ".($!+0)
 1497: 				." IO::File->new Failed "
 1498:                                     ."while attempting log\n";
 1499: 		        }
 1500: 		       }
 1501: # ------------------------------------------------------------------------- put
 1502:                    } elsif ($userinput =~ /^put/) {
 1503:                       my ($cmd,$udom,$uname,$namespace,$what)
 1504:                           =split(/:/,$userinput);
 1505:                       $namespace=~s/\//\_/g;
 1506:                       $namespace=~s/\W//g;
 1507:                       if ($namespace ne 'roles') {
 1508:                        chomp($what);
 1509:                        my $proname=propath($udom,$uname);
 1510:                        my $now=time;
 1511:                        unless ($namespace=~/^nohist\_/) {
 1512: 			   my $hfh;
 1513: 			   if (
 1514:                              $hfh=IO::File->new(">>$proname/$namespace.hist")
 1515: 			       ) { print $hfh "P:$now:$what\n"; }
 1516: 		       }
 1517:                        my @pairs=split(/\&/,$what);
 1518: 		       my %hash;
 1519: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
 1520:                            foreach my $pair (@pairs) {
 1521: 			       my ($key,$value)=split(/=/,$pair);
 1522:                                $hash{$key}=$value;
 1523:                            }
 1524: 			   if (untie(%hash)) {
 1525:                               print $client "ok\n";
 1526:                            } else {
 1527:                               print $client "error: ".($!+0)
 1528: 				  ." untie(GDBM) failed ".
 1529:                                       "while attempting put\n";
 1530:                            }
 1531:                        } else {
 1532:                            print $client "error: ".($!)
 1533: 			       ." tie(GDBM) Failed ".
 1534:                                    "while attempting put\n";
 1535:                        }
 1536: 		      } else {
 1537:                           print $client "refused\n";
 1538:                       }
 1539: # -------------------------------------------------------------------- rolesput
 1540:                    } elsif ($userinput =~ /^rolesput/) {
 1541: 		       &Debug("rolesput");
 1542: 		    if ($wasenc==1) {
 1543:                        my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
 1544:                           =split(/:/,$userinput);
 1545: 		       &Debug("cmd = ".$cmd." exedom= ".$exedom.
 1546: 				    "user = ".$exeuser." udom=".$udom.
 1547: 				    "what = ".$what);
 1548:                        my $namespace='roles';
 1549:                        chomp($what);
 1550:                        my $proname=propath($udom,$uname);
 1551:                        my $now=time;
 1552:                        {
 1553: 			   my $hfh;
 1554: 			   if (
 1555:                              $hfh=IO::File->new(">>$proname/$namespace.hist")
 1556: 			       ) { 
 1557:                                   print $hfh "P:$now:$exedom:$exeuser:$what\n";
 1558:                                  }
 1559: 		       }
 1560:                        my @pairs=split(/\&/,$what);
 1561: 		       my %hash;
 1562: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
 1563:                            foreach my $pair (@pairs) {
 1564: 			       my ($key,$value)=split(/=/,$pair);
 1565: 			       &ManagePermissions($key, $udom, $uname,
 1566: 						  &GetAuthType( $udom, 
 1567: 								$uname));
 1568:                                $hash{$key}=$value;
 1569:                            }
 1570: 			   if (untie(%hash)) {
 1571:                               print $client "ok\n";
 1572:                            } else {
 1573:                               print $client "error: ".($!+0)
 1574: 				  ." untie(GDBM) Failed ".
 1575:                                       "while attempting rolesput\n";
 1576:                            }
 1577:                        } else {
 1578:                            print $client "error: ".($!+0)
 1579: 			       ." tie(GDBM) Failed ".
 1580:                                    "while attempting rolesput\n";
 1581:                        }
 1582: 		      } else {
 1583:                           print $client "refused\n";
 1584:                       }
 1585: # -------------------------------------------------------------------- rolesdel
 1586:                    } elsif ($userinput =~ /^rolesdel/) {
 1587: 		       &Debug("rolesdel");
 1588: 		    if ($wasenc==1) {
 1589:                        my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
 1590:                           =split(/:/,$userinput);
 1591: 		       &Debug("cmd = ".$cmd." exedom= ".$exedom.
 1592: 				    "user = ".$exeuser." udom=".$udom.
 1593: 				    "what = ".$what);
 1594:                        my $namespace='roles';
 1595:                        chomp($what);
 1596:                        my $proname=propath($udom,$uname);
 1597:                        my $now=time;
 1598:                        {
 1599: 			   my $hfh;
 1600: 			   if (
 1601:                              $hfh=IO::File->new(">>$proname/$namespace.hist")
 1602: 			       ) { 
 1603:                                   print $hfh "D:$now:$exedom:$exeuser:$what\n";
 1604:                                  }
 1605: 		       }
 1606:                        my @rolekeys=split(/\&/,$what);
 1607: 		       my %hash;
 1608: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
 1609:                            foreach my $key (@rolekeys) {
 1610:                                delete $hash{$key};
 1611:                            }
 1612: 			   if (untie(%hash)) {
 1613:                               print $client "ok\n";
 1614:                            } else {
 1615:                               print $client "error: ".($!+0)
 1616: 				  ." untie(GDBM) Failed ".
 1617:                                       "while attempting rolesdel\n";
 1618:                            }
 1619:                        } else {
 1620:                            print $client "error: ".($!+0)
 1621: 			       ." tie(GDBM) Failed ".
 1622:                                    "while attempting rolesdel\n";
 1623:                        }
 1624: 		      } else {
 1625:                           print $client "refused\n";
 1626:                       }
 1627: # ------------------------------------------------------------------------- get
 1628:                    } elsif ($userinput =~ /^get/) {
 1629:                        my ($cmd,$udom,$uname,$namespace,$what)
 1630:                           =split(/:/,$userinput);
 1631:                        $namespace=~s/\//\_/g;
 1632:                        $namespace=~s/\W//g;
 1633:                        chomp($what);
 1634:                        my @queries=split(/\&/,$what);
 1635:                        my $proname=propath($udom,$uname);
 1636:                        my $qresult='';
 1637: 		       my %hash;
 1638: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
 1639:                            for (my $i=0;$i<=$#queries;$i++) {
 1640:                                $qresult.="$hash{$queries[$i]}&";
 1641:                            }
 1642: 			   if (untie(%hash)) {
 1643: 		              $qresult=~s/\&$//;
 1644:                               print $client "$qresult\n";
 1645:                            } else {
 1646:                               print $client "error: ".($!+0)
 1647: 				  ." untie(GDBM) Failed ".
 1648:                                       "while attempting get\n";
 1649:                            }
 1650:                        } else {
 1651:                            if ($!+0 == 2) {
 1652:                                print $client "error:No such file or ".
 1653:                                    "GDBM reported bad block error\n";
 1654:                            } else {
 1655:                                print $client "error: ".($!+0)
 1656:                                    ." tie(GDBM) Failed ".
 1657:                                        "while attempting get\n";
 1658:                            }
 1659:                        }
 1660: # ------------------------------------------------------------------------ eget
 1661:                    } elsif ($userinput =~ /^eget/) {
 1662:                        my ($cmd,$udom,$uname,$namespace,$what)
 1663:                           =split(/:/,$userinput);
 1664:                        $namespace=~s/\//\_/g;
 1665:                        $namespace=~s/\W//g;
 1666:                        chomp($what);
 1667:                        my @queries=split(/\&/,$what);
 1668:                        my $proname=propath($udom,$uname);
 1669:                        my $qresult='';
 1670: 		       my %hash;
 1671: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
 1672:                            for (my $i=0;$i<=$#queries;$i++) {
 1673:                                $qresult.="$hash{$queries[$i]}&";
 1674:                            }
 1675: 			   if (untie(%hash)) {
 1676: 		              $qresult=~s/\&$//;
 1677:                               if ($cipher) {
 1678:                                 my $cmdlength=length($qresult);
 1679:                                 $qresult.="         ";
 1680:                                 my $encqresult='';
 1681:                                 for 
 1682: 				(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
 1683:                                  $encqresult.=
 1684:                                  unpack("H16",
 1685:                                  $cipher->encrypt(substr($qresult,$encidx,8)));
 1686:                                 }
 1687:                                 print $client "enc:$cmdlength:$encqresult\n";
 1688: 			      } else {
 1689: 			        print $client "error:no_key\n";
 1690:                               }
 1691:                            } else {
 1692:                               print $client "error: ".($!+0)
 1693: 				  ." untie(GDBM) Failed ".
 1694:                                       "while attempting eget\n";
 1695:                            }
 1696:                        } else {
 1697:                            print $client "error: ".($!+0)
 1698: 			       ." tie(GDBM) Failed ".
 1699:                                    "while attempting eget\n";
 1700:                        }
 1701: # ------------------------------------------------------------------------- del
 1702:                    } elsif ($userinput =~ /^del/) {
 1703:                        my ($cmd,$udom,$uname,$namespace,$what)
 1704:                           =split(/:/,$userinput);
 1705:                        $namespace=~s/\//\_/g;
 1706:                        $namespace=~s/\W//g;
 1707:                        chomp($what);
 1708:                        my $proname=propath($udom,$uname);
 1709:                        my $now=time;
 1710:                        unless ($namespace=~/^nohist\_/) {
 1711: 			   my $hfh;
 1712: 			   if (
 1713:                              $hfh=IO::File->new(">>$proname/$namespace.hist")
 1714: 			       ) { print $hfh "D:$now:$what\n"; }
 1715: 		       }
 1716:                        my @keys=split(/\&/,$what);
 1717: 		       my %hash;
 1718: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
 1719:                            foreach my $key (@keys) {
 1720:                                delete($hash{$key});
 1721:                            }
 1722: 			   if (untie(%hash)) {
 1723:                               print $client "ok\n";
 1724:                            } else {
 1725:                               print $client "error: ".($!+0)
 1726: 				  ." untie(GDBM) Failed ".
 1727:                                       "while attempting del\n";
 1728:                            }
 1729:                        } else {
 1730:                            print $client "error: ".($!+0)
 1731: 			       ." tie(GDBM) Failed ".
 1732:                                    "while attempting del\n";
 1733:                        }
 1734: # ------------------------------------------------------------------------ keys
 1735:                    } elsif ($userinput =~ /^keys/) {
 1736:                        my ($cmd,$udom,$uname,$namespace)
 1737:                           =split(/:/,$userinput);
 1738:                        $namespace=~s/\//\_/g;
 1739:                        $namespace=~s/\W//g;
 1740:                        my $proname=propath($udom,$uname);
 1741:                        my $qresult='';
 1742: 		       my %hash;
 1743: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
 1744:                            foreach my $key (keys %hash) {
 1745:                                $qresult.="$key&";
 1746:                            }
 1747: 			   if (untie(%hash)) {
 1748: 		              $qresult=~s/\&$//;
 1749:                               print $client "$qresult\n";
 1750:                            } else {
 1751:                               print $client "error: ".($!+0)
 1752: 				  ." untie(GDBM) Failed ".
 1753:                                       "while attempting keys\n";
 1754:                            }
 1755:                        } else {
 1756:                            print $client "error: ".($!+0)
 1757: 			       ." tie(GDBM) Failed ".
 1758:                                    "while attempting keys\n";
 1759:                        }
 1760: # ----------------------------------------------------------------- dumpcurrent
 1761:                    } elsif ($userinput =~ /^currentdump/) {
 1762:                        my ($cmd,$udom,$uname,$namespace)
 1763:                           =split(/:/,$userinput);
 1764:                        $namespace=~s/\//\_/g;
 1765:                        $namespace=~s/\W//g;
 1766:                        my $qresult='';
 1767:                        my $proname=propath($udom,$uname);
 1768: 		       my %hash;
 1769:                        if (tie(%hash,'GDBM_File',
 1770:                                "$proname/$namespace.db",
 1771:                                &GDBM_READER(),0640)) {
 1772:                            # Structure of %data:
 1773:                            # $data{$symb}->{$parameter}=$value;
 1774:                            # $data{$symb}->{'v.'.$parameter}=$version;
 1775:                            # since $parameter will be unescaped, we do not
 1776:                            # have to worry about silly parameter names...
 1777:                            my %data = ();
 1778:                            while (my ($key,$value) = each(%hash)) {
 1779:                               my ($v,$symb,$param) = split(/:/,$key);
 1780:                               next if ($v eq 'version' || $symb eq 'keys');
 1781:                               next if (exists($data{$symb}) && 
 1782:                                        exists($data{$symb}->{$param}) &&
 1783:                                        $data{$symb}->{'v.'.$param} > $v);
 1784:                               $data{$symb}->{$param}=$value;
 1785:                               $data{$symb}->{'v.'.$param}=$v;
 1786:                            }
 1787:                            if (untie(%hash)) {
 1788:                              while (my ($symb,$param_hash) = each(%data)) {
 1789:                                while(my ($param,$value) = each (%$param_hash)){
 1790:                                  next if ($param =~ /^v\./);
 1791:                                  $qresult.=$symb.':'.$param.'='.$value.'&';
 1792:                                }
 1793:                              }
 1794:                              chop($qresult);
 1795:                              print $client "$qresult\n";
 1796:                            } else {
 1797:                              print $client "error: ".($!+0)
 1798: 				 ." untie(GDBM) Failed ".
 1799:                                      "while attempting currentdump\n";
 1800:                            }
 1801:                        } else {
 1802:                            print $client "error: ".($!+0)
 1803: 			       ." tie(GDBM) Failed ".
 1804:                                       "while attempting currentdump\n";
 1805:                        }
 1806: # ------------------------------------------------------------------------ dump
 1807:                    } elsif ($userinput =~ /^dump/) {
 1808:                        my ($cmd,$udom,$uname,$namespace,$regexp)
 1809:                           =split(/:/,$userinput);
 1810:                        $namespace=~s/\//\_/g;
 1811:                        $namespace=~s/\W//g;
 1812:                        if (defined($regexp)) {
 1813:                           $regexp=&unescape($regexp);
 1814: 		       } else {
 1815:                           $regexp='.';
 1816: 		       }
 1817:                        my $qresult='';
 1818:                        my $proname=propath($udom,$uname);
 1819: 		       my %hash;
 1820: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
 1821:                            study($regexp);
 1822:                            while (my ($key,$value) = each(%hash)) {
 1823:                                if ($regexp eq '.') {
 1824:                                    $qresult.=$key.'='.$value.'&';
 1825:                                } else {
 1826:                                    my $unescapeKey = &unescape($key);
 1827:                                    if (eval('$unescapeKey=~/$regexp/')) {
 1828:                                        $qresult.="$key=$value&";
 1829:                                    }
 1830:                                }
 1831:                            }
 1832:                            if (untie(%hash)) {
 1833:                                chop($qresult);
 1834:                                print $client "$qresult\n";
 1835:                            } else {
 1836:                                print $client "error: ".($!+0)
 1837: 				   ." untie(GDBM) Failed ".
 1838:                                        "while attempting dump\n";
 1839:                            }
 1840:                        } else {
 1841:                            print $client "error: ".($!+0)
 1842: 			       ." tie(GDBM) Failed ".
 1843:                                       "while attempting dump\n";
 1844:                        }
 1845: # ----------------------------------------------------------------------- store
 1846:                    } elsif ($userinput =~ /^store/) {
 1847:                       my ($cmd,$udom,$uname,$namespace,$rid,$what)
 1848:                           =split(/:/,$userinput);
 1849:                       $namespace=~s/\//\_/g;
 1850:                       $namespace=~s/\W//g;
 1851:                       if ($namespace ne 'roles') {
 1852:                        chomp($what);
 1853:                        my $proname=propath($udom,$uname);
 1854:                        my $now=time;
 1855:                        unless ($namespace=~/^nohist\_/) {
 1856: 			   my $hfh;
 1857: 			   if (
 1858:                              $hfh=IO::File->new(">>$proname/$namespace.hist")
 1859: 			       ) { print $hfh "P:$now:$rid:$what\n"; }
 1860: 		       }
 1861:                        my @pairs=split(/\&/,$what);
 1862: 		       my %hash;
 1863: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
 1864:                            my @previouskeys=split(/&/,$hash{"keys:$rid"});
 1865:                            my $key;
 1866:                            $hash{"version:$rid"}++;
 1867:                            my $version=$hash{"version:$rid"};
 1868:                            my $allkeys=''; 
 1869:                            foreach my $pair (@pairs) {
 1870: 			       my ($key,$value)=split(/=/,$pair);
 1871:                                $allkeys.=$key.':';
 1872:                                $hash{"$version:$rid:$key"}=$value;
 1873:                            }
 1874:                            $hash{"$version:$rid:timestamp"}=$now;
 1875:                            $allkeys.='timestamp';
 1876:                            $hash{"$version:keys:$rid"}=$allkeys;
 1877: 			   if (untie(%hash)) {
 1878:                               print $client "ok\n";
 1879:                            } else {
 1880:                               print $client "error: ".($!+0)
 1881: 				  ." untie(GDBM) Failed ".
 1882:                                       "while attempting store\n";
 1883:                            }
 1884:                        } else {
 1885:                            print $client "error: ".($!+0)
 1886: 			       ." tie(GDBM) Failed ".
 1887:                                    "while attempting store\n";
 1888:                        }
 1889: 		      } else {
 1890:                           print $client "refused\n";
 1891:                       }
 1892: # --------------------------------------------------------------------- restore
 1893:                    } elsif ($userinput =~ /^restore/) {
 1894:                        my ($cmd,$udom,$uname,$namespace,$rid)
 1895:                           =split(/:/,$userinput);
 1896:                        $namespace=~s/\//\_/g;
 1897:                        $namespace=~s/\W//g;
 1898:                        chomp($rid);
 1899:                        my $proname=propath($udom,$uname);
 1900:                        my $qresult='';
 1901: 		       my %hash;
 1902: 		       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
 1903:                 	   my $version=$hash{"version:$rid"};
 1904:                            $qresult.="version=$version&";
 1905:                            my $scope;
 1906:                            for ($scope=1;$scope<=$version;$scope++) {
 1907: 			      my $vkeys=$hash{"$scope:keys:$rid"};
 1908:                               my @keys=split(/:/,$vkeys);
 1909:                               my $key;
 1910:                               $qresult.="$scope:keys=$vkeys&";
 1911:                               foreach $key (@keys) {
 1912: 	     $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
 1913:                               }                                  
 1914:                            }
 1915: 			   if (untie(%hash)) {
 1916: 		              $qresult=~s/\&$//;
 1917:                               print $client "$qresult\n";
 1918:                            } else {
 1919:                               print $client "error: ".($!+0)
 1920: 				  ." untie(GDBM) Failed ".
 1921:                                       "while attempting restore\n";
 1922:                            }
 1923:                        } else {
 1924:                            print $client "error: ".($!+0)
 1925: 			       ." tie(GDBM) Failed ".
 1926:                                    "while attempting restore\n";
 1927:                        }
 1928: # -------------------------------------------------------------------- chatsend
 1929:                    } elsif ($userinput =~ /^chatsend/) {
 1930:                        my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
 1931:                        &chatadd($cdom,$cnum,$newpost);
 1932:                        print $client "ok\n";
 1933: # -------------------------------------------------------------------- chatretr
 1934:                    } elsif ($userinput =~ /^chatretr/) {
 1935:                        my 
 1936:                         ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
 1937:                        my $reply='';
 1938:                        foreach (&getchat($cdom,$cnum,$udom,$uname)) {
 1939: 			   $reply.=&escape($_).':';
 1940:                        }
 1941:                        $reply=~s/\:$//;
 1942:                        print $client $reply."\n";
 1943: # ------------------------------------------------------------------- querysend
 1944:                    } elsif ($userinput =~ /^querysend/) {
 1945:                        my ($cmd,$query,
 1946: 			   $arg1,$arg2,$arg3)=split(/\:/,$userinput);
 1947: 		       $query=~s/\n*$//g;
 1948: 		       print $client "".
 1949: 			       sqlreply("$hostid{$clientip}\&$query".
 1950: 					"\&$arg1"."\&$arg2"."\&$arg3")."\n";
 1951: # ------------------------------------------------------------------ queryreply
 1952:                    } elsif ($userinput =~ /^queryreply/) {
 1953:                        my ($cmd,$id,$reply)=split(/:/,$userinput); 
 1954: 		       my $store;
 1955:                        my $execdir=$perlvar{'lonDaemons'};
 1956:                        if ($store=IO::File->new(">$execdir/tmp/$id")) {
 1957: 			   $reply=~s/\&/\n/g;
 1958: 			   print $store $reply;
 1959: 			   close $store;
 1960: 			   my $store2=IO::File->new(">$execdir/tmp/$id.end");
 1961: 			   print $store2 "done\n";
 1962: 			   close $store2;
 1963: 			   print $client "ok\n";
 1964: 		       }
 1965: 		       else {
 1966: 			   print $client "error: ".($!+0)
 1967: 			       ." IO::File->new Failed ".
 1968:                                    "while attempting queryreply\n";
 1969: 		       }
 1970: # ----------------------------------------------------------------- courseidput
 1971:                    } elsif ($userinput =~ /^courseidput/) {
 1972:                        my ($cmd,$udom,$what)=split(/:/,$userinput);
 1973:                        chomp($what);
 1974:                        $udom=~s/\W//g;
 1975:                        my $proname=
 1976:                               "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
 1977:                        my $now=time;
 1978:                        my @pairs=split(/\&/,$what);
 1979: 		       my %hash;
 1980: 		       if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
 1981:                            foreach my $pair (@pairs) {
 1982: 			       my ($key,$value)=split(/=/,$pair);
 1983:                                $hash{$key}=$value.':'.$now;
 1984:                            }
 1985: 			   if (untie(%hash)) {
 1986:                               print $client "ok\n";
 1987:                            } else {
 1988:                               print $client "error: ".($!+0)
 1989: 				  ." untie(GDBM) Failed ".
 1990:                                       "while attempting courseidput\n";
 1991:                            }
 1992:                        } else {
 1993:                            print $client "error: ".($!+0)
 1994: 			       ." tie(GDBM) Failed ".
 1995:                                       "while attempting courseidput\n";
 1996:                        }
 1997: # ---------------------------------------------------------------- courseiddump
 1998:                    } elsif ($userinput =~ /^courseiddump/) {
 1999:                        my ($cmd,$udom,$since,$description)
 2000:                           =split(/:/,$userinput);
 2001:                        if (defined($description)) {
 2002:                           $description=&unescape($description);
 2003: 		       } else {
 2004:                           $description='.';
 2005: 		       }
 2006:                        unless (defined($since)) { $since=0; }
 2007:                        my $qresult='';
 2008:                        my $proname=
 2009:                               "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
 2010: 		       my %hash;
 2011: 		       if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
 2012:                            while (my ($key,$value) = each(%hash)) {
 2013:                                my ($descr,$lasttime)=split(/\:/,$value);
 2014:                                if ($lasttime<$since) { next; }
 2015:                                if ($description eq '.') {
 2016:                                    $qresult.=$key.'='.$descr.'&';
 2017:                                } else {
 2018:                                    my $unescapeVal = &unescape($descr);
 2019:                                    if (eval('$unescapeVal=~/$description/i')) {
 2020:                                        $qresult.="$key=$descr&";
 2021:                                    }
 2022:                                }
 2023:                            }
 2024:                            if (untie(%hash)) {
 2025:                                chop($qresult);
 2026:                                print $client "$qresult\n";
 2027:                            } else {
 2028:                                print $client "error: ".($!+0)
 2029: 				   ." untie(GDBM) Failed ".
 2030:                                        "while attempting courseiddump\n";
 2031:                            }
 2032:                        } else {
 2033:                            print $client "error: ".($!+0)
 2034: 			       ." tie(GDBM) Failed ".
 2035:                                       "while attempting courseiddump\n";
 2036:                        }
 2037: # ----------------------------------------------------------------------- idput
 2038:                    } elsif ($userinput =~ /^idput/) {
 2039:                        my ($cmd,$udom,$what)=split(/:/,$userinput);
 2040:                        chomp($what);
 2041:                        $udom=~s/\W//g;
 2042:                        my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
 2043:                        my $now=time;
 2044:                        {
 2045: 			   my $hfh;
 2046: 			   if (
 2047:                              $hfh=IO::File->new(">>$proname.hist")
 2048: 			       ) { print $hfh "P:$now:$what\n"; }
 2049: 		       }
 2050:                        my @pairs=split(/\&/,$what);
 2051: 		       my %hash;
 2052: 		       if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
 2053:                            foreach my $pair (@pairs) {
 2054: 			       my ($key,$value)=split(/=/,$pair);
 2055:                                $hash{$key}=$value;
 2056:                            }
 2057: 			   if (untie(%hash)) {
 2058:                               print $client "ok\n";
 2059:                            } else {
 2060:                               print $client "error: ".($!+0)
 2061: 				  ." untie(GDBM) Failed ".
 2062:                                       "while attempting idput\n";
 2063:                            }
 2064:                        } else {
 2065:                            print $client "error: ".($!+0)
 2066: 			       ." tie(GDBM) Failed ".
 2067:                                       "while attempting idput\n";
 2068:                        }
 2069: # ----------------------------------------------------------------------- idget
 2070:                    } elsif ($userinput =~ /^idget/) {
 2071:                        my ($cmd,$udom,$what)=split(/:/,$userinput);
 2072:                        chomp($what);
 2073:                        $udom=~s/\W//g;
 2074:                        my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
 2075:                        my @queries=split(/\&/,$what);
 2076:                        my $qresult='';
 2077: 		       my %hash;
 2078: 		       if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
 2079:                            for (my $i=0;$i<=$#queries;$i++) {
 2080:                                $qresult.="$hash{$queries[$i]}&";
 2081:                            }
 2082: 			   if (untie(%hash)) {
 2083: 			       $qresult=~s/\&$//;
 2084: 			       print $client "$qresult\n";
 2085:                            } else {
 2086: 			       print $client "error: ".($!+0)
 2087: 				   ." untie(GDBM) Failed ".
 2088: 				       "while attempting idget\n";
 2089:                            }
 2090:                        } else {
 2091:                            print $client "error: ".($!+0)
 2092: 			       ." tie(GDBM) Failed ".
 2093:                                    "while attempting idget\n";
 2094:                        }
 2095: # ---------------------------------------------------------------------- tmpput
 2096:                    } elsif ($userinput =~ /^tmpput/) {
 2097:                        my ($cmd,$what)=split(/:/,$userinput);
 2098: 		       my $store;
 2099:                        $tmpsnum++;
 2100:                        my $id=$$.'_'.$clientip.'_'.$tmpsnum;
 2101:                        $id=~s/\W/\_/g;
 2102:                        $what=~s/\n//g;
 2103:                        my $execdir=$perlvar{'lonDaemons'};
 2104:                        if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
 2105: 			   print $store $what;
 2106: 			   close $store;
 2107: 			   print $client "$id\n";
 2108: 		       }
 2109: 		       else {
 2110: 			   print $client "error: ".($!+0)
 2111: 			       ."IO::File->new Failed ".
 2112:                                    "while attempting tmpput\n";
 2113: 		       }
 2114: 
 2115: # ---------------------------------------------------------------------- tmpget
 2116:                    } elsif ($userinput =~ /^tmpget/) {
 2117:                        my ($cmd,$id)=split(/:/,$userinput);
 2118:                        chomp($id);
 2119:                        $id=~s/\W/\_/g;
 2120:                        my $store;
 2121:                        my $execdir=$perlvar{'lonDaemons'};
 2122:                        if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
 2123:                            my $reply=<$store>;
 2124: 			   print $client "$reply\n";
 2125:                            close $store;
 2126: 		       }
 2127: 		       else {
 2128: 			   print $client "error: ".($!+0)
 2129: 			       ."IO::File->new Failed ".
 2130:                                    "while attempting tmpget\n";
 2131: 		       }
 2132: 
 2133: # ---------------------------------------------------------------------- tmpdel
 2134:                    } elsif ($userinput =~ /^tmpdel/) {
 2135:                        my ($cmd,$id)=split(/:/,$userinput);
 2136:                        chomp($id);
 2137:                        $id=~s/\W/\_/g;
 2138:                        my $execdir=$perlvar{'lonDaemons'};
 2139:                        if (unlink("$execdir/tmp/$id.tmp")) {
 2140: 			   print $client "ok\n";
 2141: 		       } else {
 2142: 			   print $client "error: ".($!+0)
 2143: 			       ."Unlink tmp Failed ".
 2144:                                    "while attempting tmpdel\n";
 2145: 		       }
 2146: # -------------------------------------------------------------------------- ls
 2147:                    } elsif ($userinput =~ /^ls/) {
 2148:                        my ($cmd,$ulsdir)=split(/:/,$userinput);
 2149:                        my $ulsout='';
 2150:                        my $ulsfn;
 2151:                        if (-e $ulsdir) {
 2152:                            if(-d $ulsdir) {
 2153:                                if (opendir(LSDIR,$ulsdir)) {
 2154:                                    while ($ulsfn=readdir(LSDIR)) {
 2155:                                        my @ulsstats=stat($ulsdir.'/'.$ulsfn);
 2156:                                        $ulsout.=$ulsfn.'&'.
 2157:                                                 join('&',@ulsstats).':';
 2158:                                    }
 2159:                                    closedir(LSDIR);
 2160:                                }
 2161:                            } else {
 2162:                                my @ulsstats=stat($ulsdir);
 2163:                                $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
 2164:                            }
 2165:                        } else {
 2166:                           $ulsout='no_such_dir';
 2167:                        }
 2168:                        if ($ulsout eq '') { $ulsout='empty'; }
 2169:                        print $client "$ulsout\n";
 2170: # ----------------------------------------------------------------- setannounce
 2171:                    } elsif ($userinput =~ /^setannounce/) {
 2172: 		       my ($cmd,$announcement)=split(/:/,$userinput);
 2173: 		       chomp($announcement);
 2174: 		       $announcement=&unescape($announcement);
 2175:                        if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
 2176: 						'/announcement.txt')) {
 2177: 			   print $store $announcement;
 2178:                            close $store;
 2179: 			   print $client "ok\n";
 2180: 		       } else {
 2181: 			   print $client "error: ".($!+0)."\n";
 2182: 		       }
 2183: # ------------------------------------------------------------------ Hanging up
 2184:                    } elsif (($userinput =~ /^exit/) ||
 2185:                             ($userinput =~ /^init/)) {
 2186:                        &logthis(
 2187:       "Client $clientip ($hostid{$clientip}) hanging up: $userinput");
 2188:                        print $client "bye\n";
 2189:                        $client->close();
 2190: 		       last;
 2191: # ------------------------------------------------------------- unknown command
 2192: 		   } elsif ($userinput =~ /^sethost:/) {
 2193: 		       print $client &sethost($userinput)."\n";
 2194: 		   } elsif ($userinput =~/^version:/) {
 2195: 		       print $client &version($userinput)."\n";
 2196:                    } else {
 2197:                        # unknown command
 2198:                        print $client "unknown_cmd\n";
 2199:                    }
 2200: # -------------------------------------------------------------------- complete
 2201: 		   alarm(0);
 2202:                    &status('Listening to '.$hostid{$clientip});
 2203: 	       }
 2204: # --------------------------------------------- client unknown or fishy, refuse
 2205:             } else {
 2206: 	        print $client "refused\n";
 2207:                 $client->close();
 2208:                 &logthis("<font color=blue>WARNING: "
 2209:                 ."Rejected client $clientip, closing connection</font>");
 2210:             }
 2211: 	}             
 2212: 
 2213: # =============================================================================
 2214:        
 2215: 	&logthis("<font color=red>CRITICAL: "
 2216: 		 ."Disconnect from $clientip ($hostid{$clientip})</font>");    
 2217: 
 2218: 
 2219:         # this exit is VERY important, otherwise the child will become
 2220:         # a producer of more and more children, forking yourself into
 2221:         # process death.
 2222:         exit;
 2223:     
 2224: }
 2225: 
 2226: 
 2227: #
 2228: #   Checks to see if the input roleput request was to set
 2229: # an author role.  If so, invokes the lchtmldir script to set
 2230: # up a correct public_html 
 2231: # Parameters:
 2232: #    request   - The request sent to the rolesput subchunk.
 2233: #                We're looking for  /domain/_au
 2234: #    domain    - The domain in which the user is having roles doctored.
 2235: #    user      - Name of the user for which the role is being put.
 2236: #    authtype  - The authentication type associated with the user.
 2237: #
 2238: sub ManagePermissions
 2239: {
 2240:     my $request = shift;
 2241:     my $domain  = shift;
 2242:     my $user    = shift;
 2243:     my $authtype= shift;
 2244: 
 2245:     # See if the request is of the form /$domain/_au
 2246:     &logthis("ruequest is $request");
 2247:     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
 2248: 	my $execdir = $perlvar{'lonDaemons'};
 2249: 	my $userhome= "/home/$user" ;
 2250: 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
 2251: 	system("$execdir/lchtmldir $userhome $user $authtype");
 2252:     }
 2253: }
 2254: #
 2255: #   GetAuthType - Determines the authorization type of a user in a domain.
 2256: 
 2257: #     Returns the authorization type or nouser if there is no such user.
 2258: #
 2259: sub GetAuthType 
 2260: {
 2261:     my $domain = shift;
 2262:     my $user   = shift;
 2263: 
 2264:     Debug("GetAuthType( $domain, $user ) \n");
 2265:     my $proname    = &propath($domain, $user); 
 2266:     my $passwdfile = "$proname/passwd";
 2267:     if( -e $passwdfile ) {
 2268: 	my $pf = IO::File->new($passwdfile);
 2269: 	my $realpassword = <$pf>;
 2270: 	chomp($realpassword);
 2271: 	Debug("Password info = $realpassword\n");
 2272: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
 2273: 	Debug("Authtype = $authtype, content = $contentpwd\n");
 2274: 	my $availinfo = '';
 2275: 	if($authtype eq 'krb4' or $authtype eq 'krb5') {
 2276: 	    $availinfo = $contentpwd;
 2277: 	}
 2278: 
 2279: 	return "$authtype:$availinfo";
 2280:     }
 2281:     else {
 2282: 	Debug("Returning nouser");
 2283: 	return "nouser";
 2284:     }
 2285: }
 2286: 
 2287: sub addline {
 2288:     my ($fname,$hostid,$ip,$newline)=@_;
 2289:     my $contents;
 2290:     my $found=0;
 2291:     my $expr='^'.$hostid.':'.$ip.':';
 2292:     $expr =~ s/\./\\\./g;
 2293:     my $sh;
 2294:     if ($sh=IO::File->new("$fname.subscription")) {
 2295: 	while (my $subline=<$sh>) {
 2296: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
 2297: 	}
 2298: 	$sh->close();
 2299:     }
 2300:     $sh=IO::File->new(">$fname.subscription");
 2301:     if ($contents) { print $sh $contents; }
 2302:     if ($newline) { print $sh $newline; }
 2303:     $sh->close();
 2304:     return $found;
 2305: }
 2306: 
 2307: sub getchat {
 2308:     my ($cdom,$cname,$udom,$uname)=@_;
 2309:     my %hash;
 2310:     my $proname=&propath($cdom,$cname);
 2311:     my @entries=();
 2312:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
 2313: 	    &GDBM_READER(),0640)) {
 2314: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
 2315: 	untie %hash;
 2316:     }
 2317:     my @participants=();
 2318:     my $cutoff=time-60;
 2319:     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
 2320: 	    &GDBM_WRCREAT(),0640)) {
 2321:         $hash{$uname.':'.$udom}=time;
 2322:         foreach (sort keys %hash) {
 2323: 	    if ($hash{$_}>$cutoff) {
 2324: 		$participants[$#participants+1]='active_participant:'.$_;
 2325:             }
 2326:         }
 2327:         untie %hash;
 2328:     }
 2329:     return (@participants,@entries);
 2330: }
 2331: 
 2332: sub chatadd {
 2333:     my ($cdom,$cname,$newchat)=@_;
 2334:     my %hash;
 2335:     my $proname=&propath($cdom,$cname);
 2336:     my @entries=();
 2337:     my $time=time;
 2338:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
 2339: 	    &GDBM_WRCREAT(),0640)) {
 2340: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
 2341: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
 2342: 	my ($thentime,$idnum)=split(/\_/,$lastid);
 2343: 	my $newid=$time.'_000000';
 2344: 	if ($thentime==$time) {
 2345: 	    $idnum=~s/^0+//;
 2346: 	    $idnum++;
 2347: 	    $idnum=substr('000000'.$idnum,-6,6);
 2348: 	    $newid=$time.'_'.$idnum;
 2349: 	}
 2350: 	$hash{$newid}=$newchat;
 2351: 	my $expired=$time-3600;
 2352: 	foreach (keys %hash) {
 2353: 	    my ($thistime)=($_=~/(\d+)\_/);
 2354: 	    if ($thistime<$expired) {
 2355: 		delete $hash{$_};
 2356: 	    }
 2357: 	}
 2358: 	untie %hash;
 2359:     }
 2360:     {
 2361: 	my $hfh;
 2362: 	if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 
 2363: 	    print $hfh "$time:".&unescape($newchat)."\n";
 2364: 	}
 2365:     }
 2366: }
 2367: 
 2368: sub unsub {
 2369:     my ($fname,$clientip)=@_;
 2370:     my $result;
 2371:     if (unlink("$fname.$hostid{$clientip}")) {
 2372: 	$result="ok\n";
 2373:     } else {
 2374: 	$result="not_subscribed\n";
 2375:     }
 2376:     if (-e "$fname.subscription") {
 2377: 	my $found=&addline($fname,$hostid{$clientip},$clientip,'');
 2378: 	if ($found) { $result="ok\n"; }
 2379:     } else {
 2380: 	if ($result != "ok\n") { $result="not_subscribed\n"; }
 2381:     }
 2382:     return $result;
 2383: }
 2384: 
 2385: sub currentversion {
 2386:     my $fname=shift;
 2387:     my $version=-1;
 2388:     my $ulsdir='';
 2389:     if ($fname=~/^(.+)\/[^\/]+$/) {
 2390:        $ulsdir=$1;
 2391:     }
 2392:     my ($fnamere1,$fnamere2);
 2393:     # remove version if already specified
 2394:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
 2395:     # get the bits that go before and after the version number
 2396:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
 2397: 	$fnamere1=$1;
 2398: 	$fnamere2='.'.$2;
 2399:     }
 2400:     if (-e $fname) { $version=1; }
 2401:     if (-e $ulsdir) {
 2402: 	if(-d $ulsdir) {
 2403: 	    if (opendir(LSDIR,$ulsdir)) {
 2404: 		my $ulsfn;
 2405: 		while ($ulsfn=readdir(LSDIR)) {
 2406: # see if this is a regular file (ignore links produced earlier)
 2407: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
 2408: 		    unless (-l $thisfile) {
 2409: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E/) {
 2410: 			    if ($1>$version) { $version=$1; }
 2411: 			}
 2412: 		    }
 2413: 		}
 2414: 		closedir(LSDIR);
 2415: 		$version++;
 2416: 	    }
 2417: 	}
 2418:     }
 2419:     return $version;
 2420: }
 2421: 
 2422: sub thisversion {
 2423:     my $fname=shift;
 2424:     my $version=-1;
 2425:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
 2426: 	$version=$1;
 2427:     }
 2428:     return $version;
 2429: }
 2430: 
 2431: sub subscribe {
 2432:     my ($userinput,$clientip)=@_;
 2433:     my $result;
 2434:     my ($cmd,$fname)=split(/:/,$userinput);
 2435:     my $ownership=&ishome($fname);
 2436:     if ($ownership eq 'owner') {
 2437: # explitly asking for the current version?
 2438:         unless (-e $fname) {
 2439:             my $currentversion=&currentversion($fname);
 2440: 	    if (&thisversion($fname)==$currentversion) {
 2441:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
 2442: 		    my $root=$1;
 2443:                     my $extension=$2;
 2444:                     symlink($root.'.'.$extension,
 2445:                             $root.'.'.$currentversion.'.'.$extension);
 2446:                     unless ($extension=~/\.meta$/) {
 2447:                        symlink($root.'.'.$extension.'.meta',
 2448:                             $root.'.'.$currentversion.'.'.$extension.'.meta');
 2449: 		    }
 2450:                 }
 2451:             }
 2452:         }
 2453: 	if (-e $fname) {
 2454: 	    if (-d $fname) {
 2455: 		$result="directory\n";
 2456: 	    } else {
 2457: 		if (-e "$fname.$hostid{$clientip}") {&unsub($fname,$clientip);}
 2458: 		my $now=time;
 2459: 		my $found=&addline($fname,$hostid{$clientip},$clientip,
 2460: 				   "$hostid{$clientip}:$clientip:$now\n");
 2461: 		if ($found) { $result="$fname\n"; }
 2462: 		# if they were subscribed to only meta data, delete that
 2463:                 # subscription, when you subscribe to a file you also get
 2464:                 # the metadata
 2465: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
 2466: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
 2467: 		$fname="http://$thisserver/".$fname;
 2468: 		$result="$fname\n";
 2469: 	    }
 2470: 	} else {
 2471: 	    $result="not_found\n";
 2472: 	}
 2473:     } else {
 2474: 	$result="rejected\n";
 2475:     }
 2476:     return $result;
 2477: }
 2478: 
 2479: sub make_passwd_file {
 2480:     my ($uname, $umode,$npass,$passfilename)=@_;
 2481:     my $result="ok\n";
 2482:     if ($umode eq 'krb4' or $umode eq 'krb5') {
 2483: 	{
 2484: 	    my $pf = IO::File->new(">$passfilename");
 2485: 	    print $pf "$umode:$npass\n";
 2486: 	}
 2487:     } elsif ($umode eq 'internal') {
 2488: 	my $salt=time;
 2489: 	$salt=substr($salt,6,2);
 2490: 	my $ncpass=crypt($npass,$salt);
 2491: 	{
 2492: 	    &Debug("Creating internal auth");
 2493: 	    my $pf = IO::File->new(">$passfilename");
 2494: 	    print $pf "internal:$ncpass\n"; 
 2495: 	}
 2496:     } elsif ($umode eq 'localauth') {
 2497: 	{
 2498: 	    my $pf = IO::File->new(">$passfilename");
 2499: 	    print $pf "localauth:$npass\n";
 2500: 	}
 2501:     } elsif ($umode eq 'unix') {
 2502: 	{
 2503: 	    my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
 2504: 	    {
 2505: 		&Debug("Executing external: ".$execpath);
 2506: 		&Debug("user  = ".$uname.", Password =". $npass);
 2507: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
 2508: 		print $se "$uname\n";
 2509: 		print $se "$npass\n";
 2510: 		print $se "$npass\n";
 2511: 	    }
 2512: 	    my $useraddok = $?;
 2513: 	    if($useraddok > 0) {
 2514: 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
 2515: 	    }
 2516: 	    my $pf = IO::File->new(">$passfilename");
 2517: 	    print $pf "unix:\n";
 2518: 	}
 2519:     } elsif ($umode eq 'none') {
 2520: 	{
 2521: 	    my $pf = IO::File->new(">$passfilename");
 2522: 	    print $pf "none:\n";
 2523: 	}
 2524:     } else {
 2525: 	$result="auth_mode_error\n";
 2526:     }
 2527:     return $result;
 2528: }
 2529: 
 2530: sub sethost {
 2531:     my ($remotereq) = @_;
 2532:     my (undef,$hostid)=split(/:/,$remotereq);
 2533:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
 2534:     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
 2535: 	$currenthostid=$hostid;
 2536: 	$currentdomainid=$hostdom{$hostid};
 2537: 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
 2538:     } else {
 2539: 	&logthis("Requested host id $hostid not an alias of ".
 2540: 		 $perlvar{'lonHostID'}." refusing connection");
 2541: 	return 'unable_to_set';
 2542:     }
 2543:     return 'ok';
 2544: }
 2545: 
 2546: sub version {
 2547:     my ($userinput)=@_;
 2548:     $remoteVERSION=(split(/:/,$userinput))[1];
 2549:     return "version:$VERSION";
 2550: }
 2551: 
 2552: #There is a copy of this in lonnet.pm
 2553: sub userload {
 2554:     my $numusers=0;
 2555:     {
 2556: 	opendir(LONIDS,$perlvar{'lonIDsDir'});
 2557: 	my $filename;
 2558: 	my $curtime=time;
 2559: 	while ($filename=readdir(LONIDS)) {
 2560: 	    if ($filename eq '.' || $filename eq '..') {next;}
 2561: 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
 2562: 	    if ($curtime-$mtime < 3600) { $numusers++; }
 2563: 	}
 2564: 	closedir(LONIDS);
 2565:     }
 2566:     my $userloadpercent=0;
 2567:     my $maxuserload=$perlvar{'lonUserLoadLim'};
 2568:     if ($maxuserload) {
 2569: 	$userloadpercent=100*$numusers/$maxuserload;
 2570:     }
 2571:     $userloadpercent=sprintf("%.2f",$userloadpercent);
 2572:     return $userloadpercent;
 2573: }
 2574: 
 2575: # ----------------------------------- POD (plain old documentation, CPAN style)
 2576: 
 2577: =head1 NAME
 2578: 
 2579: lond - "LON Daemon" Server (port "LOND" 5663)
 2580: 
 2581: =head1 SYNOPSIS
 2582: 
 2583: Usage: B<lond>
 2584: 
 2585: Should only be run as user=www.  This is a command-line script which
 2586: is invoked by B<loncron>.  There is no expectation that a typical user
 2587: will manually start B<lond> from the command-line.  (In other words,
 2588: DO NOT START B<lond> YOURSELF.)
 2589: 
 2590: =head1 DESCRIPTION
 2591: 
 2592: There are two characteristics associated with the running of B<lond>,
 2593: PROCESS MANAGEMENT (starting, stopping, handling child processes)
 2594: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
 2595: subscriptions, etc).  These are described in two large
 2596: sections below.
 2597: 
 2598: B<PROCESS MANAGEMENT>
 2599: 
 2600: Preforker - server who forks first. Runs as a daemon. HUPs.
 2601: Uses IDEA encryption
 2602: 
 2603: B<lond> forks off children processes that correspond to the other servers
 2604: in the network.  Management of these processes can be done at the
 2605: parent process level or the child process level.
 2606: 
 2607: B<logs/lond.log> is the location of log messages.
 2608: 
 2609: The process management is now explained in terms of linux shell commands,
 2610: subroutines internal to this code, and signal assignments:
 2611: 
 2612: =over 4
 2613: 
 2614: =item *
 2615: 
 2616: PID is stored in B<logs/lond.pid>
 2617: 
 2618: This is the process id number of the parent B<lond> process.
 2619: 
 2620: =item *
 2621: 
 2622: SIGTERM and SIGINT
 2623: 
 2624: Parent signal assignment:
 2625:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
 2626: 
 2627: Child signal assignment:
 2628:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
 2629: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
 2630:  to restart a new child.)
 2631: 
 2632: Command-line invocations:
 2633:  B<kill> B<-s> SIGTERM I<PID>
 2634:  B<kill> B<-s> SIGINT I<PID>
 2635: 
 2636: Subroutine B<HUNTSMAN>:
 2637:  This is only invoked for the B<lond> parent I<PID>.
 2638: This kills all the children, and then the parent.
 2639: The B<lonc.pid> file is cleared.
 2640: 
 2641: =item *
 2642: 
 2643: SIGHUP
 2644: 
 2645: Current bug:
 2646:  This signal can only be processed the first time
 2647: on the parent process.  Subsequent SIGHUP signals
 2648: have no effect.
 2649: 
 2650: Parent signal assignment:
 2651:  $SIG{HUP}  = \&HUPSMAN;
 2652: 
 2653: Child signal assignment:
 2654:  none (nothing happens)
 2655: 
 2656: Command-line invocations:
 2657:  B<kill> B<-s> SIGHUP I<PID>
 2658: 
 2659: Subroutine B<HUPSMAN>:
 2660:  This is only invoked for the B<lond> parent I<PID>,
 2661: This kills all the children, and then the parent.
 2662: The B<lond.pid> file is cleared.
 2663: 
 2664: =item *
 2665: 
 2666: SIGUSR1
 2667: 
 2668: Parent signal assignment:
 2669:  $SIG{USR1} = \&USRMAN;
 2670: 
 2671: Child signal assignment:
 2672:  $SIG{USR1}= \&logstatus;
 2673: 
 2674: Command-line invocations:
 2675:  B<kill> B<-s> SIGUSR1 I<PID>
 2676: 
 2677: Subroutine B<USRMAN>:
 2678:  When invoked for the B<lond> parent I<PID>,
 2679: SIGUSR1 is sent to all the children, and the status of
 2680: each connection is logged.
 2681: 
 2682: =item *
 2683: 
 2684: SIGUSR2
 2685: 
 2686: Parent Signal assignment:
 2687:     $SIG{USR2} = \&UpdateHosts
 2688: 
 2689: Child signal assignment:
 2690:     NONE
 2691: 
 2692: 
 2693: =item *
 2694: 
 2695: SIGCHLD
 2696: 
 2697: Parent signal assignment:
 2698:  $SIG{CHLD} = \&REAPER;
 2699: 
 2700: Child signal assignment:
 2701:  none
 2702: 
 2703: Command-line invocations:
 2704:  B<kill> B<-s> SIGCHLD I<PID>
 2705: 
 2706: Subroutine B<REAPER>:
 2707:  This is only invoked for the B<lond> parent I<PID>.
 2708: Information pertaining to the child is removed.
 2709: The socket port is cleaned up.
 2710: 
 2711: =back
 2712: 
 2713: B<SERVER-SIDE ACTIVITIES>
 2714: 
 2715: Server-side information can be accepted in an encrypted or non-encrypted
 2716: method.
 2717: 
 2718: =over 4
 2719: 
 2720: =item ping
 2721: 
 2722: Query a client in the hosts.tab table; "Are you there?"
 2723: 
 2724: =item pong
 2725: 
 2726: Respond to a ping query.
 2727: 
 2728: =item ekey
 2729: 
 2730: Read in encrypted key, make cipher.  Respond with a buildkey.
 2731: 
 2732: =item load
 2733: 
 2734: Respond with CPU load based on a computation upon /proc/loadavg.
 2735: 
 2736: =item currentauth
 2737: 
 2738: Reply with current authentication information (only over an
 2739: encrypted channel).
 2740: 
 2741: =item auth
 2742: 
 2743: Only over an encrypted channel, reply as to whether a user's
 2744: authentication information can be validated.
 2745: 
 2746: =item passwd
 2747: 
 2748: Allow for a password to be set.
 2749: 
 2750: =item makeuser
 2751: 
 2752: Make a user.
 2753: 
 2754: =item passwd
 2755: 
 2756: Allow for authentication mechanism and password to be changed.
 2757: 
 2758: =item home
 2759: 
 2760: Respond to a question "are you the home for a given user?"
 2761: 
 2762: =item update
 2763: 
 2764: Update contents of a subscribed resource.
 2765: 
 2766: =item unsubscribe
 2767: 
 2768: The server is unsubscribing from a resource.
 2769: 
 2770: =item subscribe
 2771: 
 2772: The server is subscribing to a resource.
 2773: 
 2774: =item log
 2775: 
 2776: Place in B<logs/lond.log>
 2777: 
 2778: =item put
 2779: 
 2780: stores hash in namespace
 2781: 
 2782: =item rolesput
 2783: 
 2784: put a role into a user's environment
 2785: 
 2786: =item get
 2787: 
 2788: returns hash with keys from array
 2789: reference filled in from namespace
 2790: 
 2791: =item eget
 2792: 
 2793: returns hash with keys from array
 2794: reference filled in from namesp (encrypts the return communication)
 2795: 
 2796: =item rolesget
 2797: 
 2798: get a role from a user's environment
 2799: 
 2800: =item del
 2801: 
 2802: deletes keys out of array from namespace
 2803: 
 2804: =item keys
 2805: 
 2806: returns namespace keys
 2807: 
 2808: =item dump
 2809: 
 2810: dumps the complete (or key matching regexp) namespace into a hash
 2811: 
 2812: =item store
 2813: 
 2814: stores hash permanently
 2815: for this url; hashref needs to be given and should be a \%hashname; the
 2816: remaining args aren't required and if they aren't passed or are '' they will
 2817: be derived from the ENV
 2818: 
 2819: =item restore
 2820: 
 2821: returns a hash for a given url
 2822: 
 2823: =item querysend
 2824: 
 2825: Tells client about the lonsql process that has been launched in response
 2826: to a sent query.
 2827: 
 2828: =item queryreply
 2829: 
 2830: Accept information from lonsql and make appropriate storage in temporary
 2831: file space.
 2832: 
 2833: =item idput
 2834: 
 2835: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
 2836: for each student, defined perhaps by the institutional Registrar.)
 2837: 
 2838: =item idget
 2839: 
 2840: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
 2841: for each student, defined perhaps by the institutional Registrar.)
 2842: 
 2843: =item tmpput
 2844: 
 2845: Accept and store information in temporary space.
 2846: 
 2847: =item tmpget
 2848: 
 2849: Send along temporarily stored information.
 2850: 
 2851: =item ls
 2852: 
 2853: List part of a user's directory.
 2854: 
 2855: =item pushtable
 2856: 
 2857: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
 2858: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
 2859: must be restored manually in case of a problem with the new table file.
 2860: pushtable requires that the request be encrypted and validated via
 2861: ValidateManager.  The form of the command is:
 2862: enc:pushtable tablename <tablecontents> \n
 2863: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
 2864: cleartext newline.
 2865: 
 2866: =item Hanging up (exit or init)
 2867: 
 2868: What to do when a client tells the server that they (the client)
 2869: are leaving the network.
 2870: 
 2871: =item unknown command
 2872: 
 2873: If B<lond> is sent an unknown command (not in the list above),
 2874: it replys to the client "unknown_cmd".
 2875: 
 2876: 
 2877: =item UNKNOWN CLIENT
 2878: 
 2879: If the anti-spoofing algorithm cannot verify the client,
 2880: the client is rejected (with a "refused" message sent
 2881: to the client, and the connection is closed.
 2882: 
 2883: =back
 2884: 
 2885: =head1 PREREQUISITES
 2886: 
 2887: IO::Socket
 2888: IO::File
 2889: Apache::File
 2890: Symbol
 2891: POSIX
 2892: Crypt::IDEA
 2893: LWP::UserAgent()
 2894: GDBM_File
 2895: Authen::Krb4
 2896: Authen::Krb5
 2897: 
 2898: =head1 COREQUISITES
 2899: 
 2900: =head1 OSNAMES
 2901: 
 2902: linux
 2903: 
 2904: =head1 SCRIPT CATEGORIES
 2905: 
 2906: Server/Process
 2907: 
 2908: =cut

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