Annotation of loncom/lond, revision 1.168

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network
                      3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60      www         4: #
1.168   ! foxr        5: # $Id: lond,v 1.167 2003/12/22 11:29:58 foxr Exp $
1.60      www         6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
1.167     foxr       13: # the Free Software Foundation; either version 2 of the License, or 
1.60      www        14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
                     23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
1.161     foxr       27: 
                     28: 
1.60      www        29: # http://www.lon-capa.org/
                     30: #
1.54      harris41   31: 
1.134     albertel   32: use strict;
1.80      harris41   33: use lib '/home/httpd/lib/perl/';
                     34: use LONCAPA::Configuration;
                     35: 
1.1       albertel   36: use IO::Socket;
                     37: use IO::File;
1.126     albertel   38: #use Apache::File;
1.1       albertel   39: use Symbol;
                     40: use POSIX;
                     41: use Crypt::IDEA;
                     42: use LWP::UserAgent();
1.3       www        43: use GDBM_File;
                     44: use Authen::Krb4;
1.91      albertel   45: use Authen::Krb5;
1.49      albertel   46: use lib '/home/httpd/lib/perl/';
                     47: use localauth;
1.143     foxr       48: use File::Copy;
1.1       albertel   49: 
1.77      foxr       50: my $DEBUG = 0;		       # Non zero to enable debug log entries.
                     51: 
1.57      www        52: my $status='';
                     53: my $lastlog='';
                     54: 
1.168   ! foxr       55: my $VERSION='$Revision: 1.167 $'; #' stupid emacs
1.121     albertel   56: my $remoteVERSION;
1.115     albertel   57: my $currenthostid;
                     58: my $currentdomainid;
1.134     albertel   59: 
                     60: my $client;
1.140     foxr       61: my $clientip;
1.161     foxr       62: my $clientname;
1.140     foxr       63: 
1.134     albertel   64: my $server;
                     65: my $thisserver;
                     66: 
1.161     foxr       67: # 
                     68: #   Connection type is:
                     69: #      client                   - All client actions are allowed
                     70: #      manager                  - only management functions allowed.
                     71: #      both                     - Both management and client actions are allowed
                     72: #
                     73: 
                     74: my $ConnectionType;
                     75: 
1.134     albertel   76: my %hostid;
                     77: my %hostdom;
                     78: my %hostip;
1.161     foxr       79: 
                     80: my %managers;			# Ip -> manager names
                     81: 
1.141     foxr       82: my %perlvar;			# Will have the apache conf defined perl vars.
1.134     albertel   83: 
1.96      foxr       84: #
                     85: #  The array below are password error strings."
                     86: #
1.97      foxr       87: my $lastpwderror    = 13;		# Largest error number from lcpasswd.
1.96      foxr       88: my @passwderrors = ("ok",
                     89: 		   "lcpasswd must be run as user 'www'",
                     90: 		   "lcpasswd got incorrect number of arguments",
                     91: 		   "lcpasswd did not get the right nubmer of input text lines",
                     92: 		   "lcpasswd too many simultaneous pwd changes in progress",
                     93: 		   "lcpasswd User does not exist.",
                     94: 		   "lcpasswd Incorrect current passwd",
                     95: 		   "lcpasswd Unable to su to root.",
                     96: 		   "lcpasswd Cannot set new passwd.",
                     97: 		   "lcpasswd Username has invalid characters",
1.97      foxr       98: 		   "lcpasswd Invalid characters in password",
                     99: 		    "11", "12",
                    100: 		    "lcpasswd Password mismatch");
                    101: 
                    102: 
                    103: #  The array below are lcuseradd error strings.:
                    104: 
                    105: my $lastadderror = 13;
                    106: my @adderrors    = ("ok",
                    107: 		    "User ID mismatch, lcuseradd must run as user www",
                    108: 		    "lcuseradd Incorrect number of command line parameters must be 3",
                    109: 		    "lcuseradd Incorrect number of stdinput lines, must be 3",
                    110: 		    "lcuseradd Too many other simultaneous pwd changes in progress",
                    111: 		    "lcuseradd User does not exist",
1.153     www       112: 		    "lcuseradd Unable to make www member of users's group",
1.97      foxr      113: 		    "lcuseradd Unable to su to root",
                    114: 		    "lcuseradd Unable to set password",
1.153     www       115: 		    "lcuseradd Usrname has invalid characters",
1.97      foxr      116: 		    "lcuseradd Password has an invalid character",
                    117: 		    "lcuseradd User already exists",
                    118: 		    "lcuseradd Could not add user.",
                    119: 		    "lcuseradd Password mismatch");
                    120: 
1.96      foxr      121: 
                    122: #
1.140     foxr      123: #   GetCertificate: Given a transaction that requires a certificate,
                    124: #   this function will extract the certificate from the transaction
                    125: #   request.  Note that at this point, the only concept of a certificate
                    126: #   is the hostname to which we are connected.
                    127: #
                    128: #   Parameter:
                    129: #      request   - The request sent by our client (this parameterization may
                    130: #                  need to change when we really use a certificate granting
                    131: #                  authority.
                    132: #
                    133: sub GetCertificate {
                    134:     my $request = shift;
                    135: 
                    136:     return $clientip;
                    137: }
1.161     foxr      138: 
                    139: #
                    140: #   Return true if client is a manager.
                    141: #
                    142: sub isManager {
                    143:     return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
                    144: }
                    145: #
                    146: #   Return tru if client can do client functions
                    147: #
                    148: sub isClient {
                    149:     return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
                    150: }
                    151: 
                    152: 
1.156     foxr      153: #
                    154: #   ReadManagerTable: Reads in the current manager table. For now this is
                    155: #                     done on each manager authentication because:
                    156: #                     - These authentications are not frequent
                    157: #                     - This allows dynamic changes to the manager table
                    158: #                       without the need to signal to the lond.
                    159: #
                    160: 
                    161: sub ReadManagerTable {
                    162: 
                    163:     #   Clean out the old table first..
                    164: 
1.166     foxr      165:    foreach my $key (keys %managers) {
                    166:       delete $managers{$key};
                    167:    }
                    168: 
                    169:    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
                    170:    if (!open (MANAGERS, $tablename)) {
                    171:       logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
                    172:       return;
                    173:    }
                    174:    while(my $host = <MANAGERS>) {
                    175:       chomp($host);
                    176:       if ($host =~ "^#") {                  # Comment line.
                    177:          logthis('<font color="green"> Skipping line: '. "$host</font>\n");
                    178:          next;
                    179:       }
                    180:       if (!defined $hostip{$host}) { # This is a non cluster member
1.161     foxr      181: 	    #  The entry is of the form:
                    182: 	    #    cluname:hostname
                    183: 	    #  cluname - A 'cluster hostname' is needed in order to negotiate
                    184: 	    #            the host key.
                    185: 	    #  hostname- The dns name of the host.
                    186: 	    #
1.166     foxr      187:           my($cluname, $dnsname) = split(/:/, $host);
                    188:           
                    189:           my $ip = gethostbyname($dnsname);
                    190:           if(defined($ip)) {                 # bad names don't deserve entry.
                    191:             my $hostip = inet_ntoa($ip);
                    192:             $managers{$hostip} = $cluname;
                    193:             logthis('<font color="green"> registering manager '.
                    194:                     "$dnsname as $cluname with $hostip </font>\n");
                    195:          }
                    196:       } else {
                    197:          logthis('<font color="green"> existing host'." $host</font>\n");
                    198:          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
                    199:       }
                    200:    }
1.156     foxr      201: }
1.140     foxr      202: 
                    203: #
                    204: #  ValidManager: Determines if a given certificate represents a valid manager.
                    205: #                in this primitive implementation, the 'certificate' is
                    206: #                just the connecting loncapa client name.  This is checked
                    207: #                against a valid client list in the configuration.
                    208: #
                    209: #                  
                    210: sub ValidManager {
                    211:     my $certificate = shift; 
                    212: 
1.163     foxr      213:     return isManager;
1.140     foxr      214: }
                    215: #
1.143     foxr      216: #  CopyFile:  Called as part of the process of installing a 
                    217: #             new configuration file.  This function copies an existing
                    218: #             file to a backup file.
                    219: # Parameters:
                    220: #     oldfile  - Name of the file to backup.
                    221: #     newfile  - Name of the backup file.
                    222: # Return:
                    223: #     0   - Failure (errno has failure reason).
                    224: #     1   - Success.
                    225: #
                    226: sub CopyFile {
                    227:     my $oldfile = shift;
                    228:     my $newfile = shift;
                    229: 
                    230:     #  The file must exist:
                    231: 
                    232:     if(-e $oldfile) {
                    233: 
                    234: 	 # Read the old file.
                    235: 
                    236: 	my $oldfh = IO::File->new("< $oldfile");
                    237: 	if(!$oldfh) {
                    238: 	    return 0;
                    239: 	}
                    240: 	my @contents = <$oldfh>;  # Suck in the entire file.
                    241: 
                    242: 	# write the backup file:
                    243: 
                    244: 	my $newfh = IO::File->new("> $newfile");
                    245: 	if(!(defined $newfh)){
                    246: 	    return 0;
                    247: 	}
                    248: 	my $lines = scalar @contents;
                    249: 	for (my $i =0; $i < $lines; $i++) {
                    250: 	    print $newfh ($contents[$i]);
                    251: 	}
                    252: 
                    253: 	$oldfh->close;
                    254: 	$newfh->close;
                    255: 
                    256: 	chmod(0660, $newfile);
                    257: 
                    258: 	return 1;
                    259: 	    
                    260:     } else {
                    261: 	return 0;
                    262:     }
                    263: }
1.157     foxr      264: #
                    265: #  Host files are passed out with externally visible host IPs.
                    266: #  If, for example, we are behind a fire-wall or NAT host, our 
                    267: #  internally visible IP may be different than the externally
                    268: #  visible IP.  Therefore, we always adjust the contents of the
                    269: #  host file so that the entry for ME is the IP that we believe
                    270: #  we have.  At present, this is defined as the entry that
                    271: #  DNS has for us.  If by some chance we are not able to get a
                    272: #  DNS translation for us, then we assume that the host.tab file
                    273: #  is correct.  
                    274: #    BUGBUGBUG - in the future, we really should see if we can
                    275: #       easily query the interface(s) instead.
                    276: # Parameter(s):
                    277: #     contents    - The contents of the host.tab to check.
                    278: # Returns:
                    279: #     newcontents - The adjusted contents.
                    280: #
                    281: #
                    282: sub AdjustHostContents {
                    283:     my $contents  = shift;
                    284:     my $adjusted;
                    285:     my $me        = $perlvar{'lonHostID'};
                    286: 
1.166     foxr      287:  foreach my $line (split(/\n/,$contents)) {
1.157     foxr      288: 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
                    289: 	    chomp($line);
                    290: 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
                    291: 	    if ($id eq $me) {
1.166     foxr      292:           my $ip = gethostbyname($name);
                    293:           my $ipnew = inet_ntoa($ip);
                    294:          $ip = $ipnew;
1.157     foxr      295: 		#  Reconstruct the host line and append to adjusted:
                    296: 		
1.166     foxr      297: 		   my $newline = "$id:$domain:$role:$name:$ip";
                    298: 		   if($maxcon ne "") { # Not all hosts have loncnew tuning params
                    299: 		     $newline .= ":$maxcon:$idleto:$mincon";
                    300: 		   }
                    301: 		   $adjusted .= $newline."\n";
1.157     foxr      302: 		
1.166     foxr      303:       } else {		# Not me, pass unmodified.
                    304: 		   $adjusted .= $line."\n";
                    305:       }
1.157     foxr      306: 	} else {                  # Blank or comment never re-written.
                    307: 	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
                    308: 	}
1.166     foxr      309:  }
                    310:  return $adjusted;
1.157     foxr      311: }
1.143     foxr      312: #
                    313: #   InstallFile: Called to install an administrative file:
                    314: #       - The file is created with <name>.tmp
                    315: #       - The <name>.tmp file is then mv'd to <name>
                    316: #   This lugubrious procedure is done to ensure that we are never without
                    317: #   a valid, even if dated, version of the file regardless of who crashes
                    318: #   and when the crash occurs.
                    319: #
                    320: #  Parameters:
                    321: #       Name of the file
                    322: #       File Contents.
                    323: #  Return:
                    324: #      nonzero - success.
                    325: #      0       - failure and $! has an errno.
                    326: #
                    327: sub InstallFile {
                    328:     my $Filename = shift;
                    329:     my $Contents = shift;
                    330:     my $TempFile = $Filename.".tmp";
                    331: 
                    332:     #  Open the file for write:
                    333: 
                    334:     my $fh = IO::File->new("> $TempFile"); # Write to temp.
                    335:     if(!(defined $fh)) {
                    336: 	&logthis('<font color="red"> Unable to create '.$TempFile."</font>");
                    337: 	return 0;
                    338:     }
                    339:     #  write the contents of the file:
                    340: 
                    341:     print $fh ($Contents); 
                    342:     $fh->close;			# In case we ever have a filesystem w. locking
                    343: 
                    344:     chmod(0660, $TempFile);
                    345: 
                    346:     # Now we can move install the file in position.
                    347:     
                    348:     move($TempFile, $Filename);
                    349: 
                    350:     return 1;
                    351: }
                    352: 
                    353: #
1.141     foxr      354: #   PushFile:  Called to do an administrative push of a file.
                    355: #              - Ensure the file being pushed is one we support.
                    356: #              - Backup the old file to <filename.saved>
                    357: #              - Separate the contents of the new file out from the
                    358: #                rest of the request.
                    359: #              - Write the new file.
                    360: #  Parameter:
                    361: #     Request - The entire user request.  This consists of a : separated
                    362: #               string pushfile:tablename:contents.
                    363: #     NOTE:  The contents may have :'s in it as well making things a bit
                    364: #            more interesting... but not much.
                    365: #  Returns:
                    366: #     String to send to client ("ok" or "refused" if bad file).
                    367: #
                    368: sub PushFile {
                    369:     my $request = shift;    
                    370:     my ($command, $filename, $contents) = split(":", $request, 3);
                    371:     
                    372:     #  At this point in time, pushes for only the following tables are
                    373:     #  supported:
                    374:     #   hosts.tab  ($filename eq host).
                    375:     #   domain.tab ($filename eq domain).
                    376:     # Construct the destination filename or reject the request.
                    377:     #
                    378:     # lonManage is supposed to ensure this, however this session could be
                    379:     # part of some elaborate spoof that managed somehow to authenticate.
                    380:     #
                    381: 
                    382:     my $tablefile = $perlvar{'lonTabDir'}.'/'; # need to precede with dir.
                    383:     if ($filename eq "host") {
                    384: 	$tablefile .= "hosts.tab";
                    385:     } elsif ($filename eq "domain") {
                    386: 	$tablefile .= "domain.tab";
                    387:     } else {
                    388: 	return "refused";
                    389:     }
                    390:     #
                    391:     # >copy< the old table to the backup table
                    392:     #        don't rename in case system crashes/reboots etc. in the time
                    393:     #        window between a rename and write.
                    394:     #
                    395:     my $backupfile = $tablefile;
                    396:     $backupfile    =~ s/\.tab$/.old/;
1.143     foxr      397:     if(!CopyFile($tablefile, $backupfile)) {
                    398: 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
                    399: 	return "error:$!";
                    400:     }
1.141     foxr      401:     &logthis('<font color="green"> Pushfile: backed up '
                    402: 	    .$tablefile." to $backupfile</font>");
                    403:     
1.157     foxr      404:     #  If the file being pushed is the host file, we adjust the entry for ourself so that the
                    405:     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
                    406:     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
                    407:     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
                    408:     #  that possibilty.
                    409: 
                    410:     if($filename eq "host") {
                    411: 	$contents = AdjustHostContents($contents);
                    412:     }
                    413: 
1.141     foxr      414:     #  Install the new file:
                    415: 
1.143     foxr      416:     if(!InstallFile($tablefile, $contents)) {
                    417: 	&logthis('<font color="red"> Pushfile: unable to install '
1.145     foxr      418: 	 .$tablefile." $! </font>");
1.143     foxr      419: 	return "error:$!";
                    420:     }
                    421:     else {
                    422: 	&logthis('<font color="green"> Installed new '.$tablefile
                    423: 		 ."</font>");
                    424: 
                    425:     }
                    426: 
1.141     foxr      427: 
                    428:     #  Indicate success:
                    429:  
                    430:     return "ok";
                    431: 
                    432: }
1.145     foxr      433: 
                    434: #
                    435: #  Called to re-init either lonc or lond.
                    436: #
                    437: #  Parameters:
                    438: #    request   - The full request by the client.  This is of the form
                    439: #                reinit:<process>  
                    440: #                where <process> is allowed to be either of 
                    441: #                lonc or lond
                    442: #
                    443: #  Returns:
                    444: #     The string to be sent back to the client either:
                    445: #   ok         - Everything worked just fine.
                    446: #   error:why  - There was a failure and why describes the reason.
                    447: #
                    448: #
                    449: sub ReinitProcess {
                    450:     my $request = shift;
                    451: 
1.146     foxr      452: 
                    453:     # separate the request (reinit) from the process identifier and
                    454:     # validate it producing the name of the .pid file for the process.
                    455:     #
                    456:     #
                    457:     my ($junk, $process) = split(":", $request);
1.147     foxr      458:     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146     foxr      459:     if($process eq 'lonc') {
                    460: 	$processpidfile = $processpidfile."lonc.pid";
1.147     foxr      461: 	if (!open(PIDFILE, "< $processpidfile")) {
                    462: 	    return "error:Open failed for $processpidfile";
                    463: 	}
                    464: 	my $loncpid = <PIDFILE>;
                    465: 	close(PIDFILE);
                    466: 	logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
                    467: 		."</font>");
                    468: 	kill("USR2", $loncpid);
1.146     foxr      469:     } elsif ($process eq 'lond') {
1.147     foxr      470: 	logthis('<font color="red"> Reinitializing self (lond) </font>');
                    471: 	&UpdateHosts;			# Lond is us!!
1.146     foxr      472:     } else {
                    473: 	&logthis('<font color="yellow" Invalid reinit request for '.$process
                    474: 		 ."</font>");
                    475: 	return "error:Invalid process identifier $process";
                    476:     }
1.145     foxr      477:     return 'ok';
                    478: }
1.168   ! foxr      479: #   Validate a line in a configuration file edit script:
        !           480: #   Validation includes:
        !           481: #     - Ensuring the command is valid.
        !           482: #     - Ensuring the command has sufficient parameters
        !           483: #   Parameters:
        !           484: #     scriptline - A line to validate (\n has been stripped for what it's worth).
1.167     foxr      485: #
1.168   ! foxr      486: #   Return:
        !           487: #      0     - Invalid scriptline.
        !           488: #      1     - Valid scriptline
        !           489: #  NOTE:
        !           490: #     Only the command syntax is checked, not the executability of the
        !           491: #     command.
        !           492: #
        !           493: sub isValidEditCommand {
        !           494:     my $scriptline = shift;
        !           495: 
        !           496:     #   Line elements are pipe separated:
        !           497: 
        !           498:     my ($command, $key, $newline)  = split(/\|/, $scriptline);
        !           499:     &logthis('<font color="green"> isValideditCommand checking: '.
        !           500: 	     "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
        !           501:     
        !           502:     if ($command eq "delete") {
        !           503: 	#
        !           504: 	#   key with no newline.
        !           505: 	#
        !           506: 	if( ($key eq "") || ($newline ne "")) {
        !           507: 	    return 0;		# Must have key but no newline.
        !           508: 	} else {
        !           509: 	    return 1;		# Valid syntax.
        !           510: 	}
        !           511:     } elsif (($command eq "append") || ($command eq "replace")) {
        !           512: 	#
        !           513: 	#   key and newline:
        !           514: 	#
        !           515: 	if (($key eq "") || ($newline eq "")) {
        !           516: 	    return 0;
        !           517: 	} else {
        !           518: 	    return 1;
        !           519: 	}
        !           520:     } else {
        !           521: 	return 0;		# Invalid command.
        !           522:     }
        !           523:     return 0;			# Should not get here!!!
        !           524: }
        !           525: 
        !           526: #   
        !           527: #
        !           528: #   Called to edit a configuration table  file
1.167     foxr      529: #   Parameters:
                    530: #      request           - The entire command/request sent by lonc or lonManage
                    531: #   Return:
                    532: #      The reply to send to the client.
1.168   ! foxr      533: #
1.167     foxr      534: sub EditFile {
                    535:     my $request = shift;
                    536: 
                    537:     #  Split the command into it's pieces:  edit:filetype:script
                    538: 
1.168   ! foxr      539:     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
1.167     foxr      540: 
                    541:     #  Check the pre-coditions for success:
                    542: 
                    543:     if($request != "edit") {	# Something is amiss afoot alack.
                    544: 	return "error:edit request detected, but request != 'edit'\n";
                    545:     }
                    546:     if( ($filetype ne "hosts")  &&
                    547: 	($filetype ne "domain")) {
                    548: 	return "error:edit requested with invalid file specifier: $filetype \n";
                    549:     }
                    550: 
                    551:     #   Split the edit script and check it's validity.
1.168   ! foxr      552: 
        !           553:     my @scriptlines = split(/\n/, $script);  # one line per element.
        !           554:     my $linecount   = scalar(@scriptlines);
        !           555:     for(my $i = 0; $i < $linecount; $i++) {
        !           556: 	chomp($scriptlines[$i]);
        !           557: 	if(!isValidEditCommand($scriptlines[$i])) {
        !           558: 	    return "error:edit with bad script line: '$scriptlines[$i]' \n";
        !           559: 	}
        !           560:     }
1.145     foxr      561: 
1.167     foxr      562:     #   Execute the edit operation.
                    563: 
                    564: 
                    565:     return "ok\n";
                    566: }
1.141     foxr      567: #
1.96      foxr      568: #  Convert an error return code from lcpasswd to a string value.
                    569: #
                    570: sub lcpasswdstrerror {
                    571:     my $ErrorCode = shift;
1.97      foxr      572:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96      foxr      573: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
                    574:     } else {
1.98      foxr      575: 	return $passwderrors[$ErrorCode];
1.96      foxr      576:     }
                    577: }
                    578: 
1.97      foxr      579: #
                    580: # Convert an error return code from lcuseradd to a string value:
                    581: #
                    582: sub lcuseraddstrerror {
                    583:     my $ErrorCode = shift;
                    584:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
                    585: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
                    586:     } else {
1.98      foxr      587: 	return $adderrors[$ErrorCode];
1.97      foxr      588:     }
                    589: }
                    590: 
1.23      harris41  591: # grabs exception and records it to log before exiting
                    592: sub catchexception {
1.27      albertel  593:     my ($error)=@_;
1.25      www       594:     $SIG{'QUIT'}='DEFAULT';
                    595:     $SIG{__DIE__}='DEFAULT';
1.165     albertel  596:     &status("Catching exception");
1.23      harris41  597:     &logthis("<font color=red>CRITICAL: "
1.134     albertel  598:      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
1.27      albertel  599:      ."a crash with this error msg->[$error]</font>");
1.57      www       600:     &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27      albertel  601:     if ($client) { print $client "error: $error\n"; }
1.59      www       602:     $server->close();
1.27      albertel  603:     die($error);
1.23      harris41  604: }
                    605: 
1.63      www       606: sub timeout {
1.165     albertel  607:     &status("Handling Timeout");
1.63      www       608:     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
                    609:     &catchexception('Timeout');
                    610: }
1.22      harris41  611: # -------------------------------- Set signal handlers to record abnormal exits
                    612: 
                    613: $SIG{'QUIT'}=\&catchexception;
                    614: $SIG{__DIE__}=\&catchexception;
                    615: 
1.81      matthew   616: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95      harris41  617: &status("Read loncapa.conf and loncapa_apache.conf");
                    618: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141     foxr      619: %perlvar=%{$perlvarref};
1.80      harris41  620: undef $perlvarref;
1.19      www       621: 
1.35      harris41  622: # ----------------------------- Make sure this process is running from user=www
                    623: my $wwwid=getpwnam('www');
                    624: if ($wwwid!=$<) {
1.134     albertel  625:    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                    626:    my $subj="LON: $currenthostid User ID mismatch";
1.37      harris41  627:    system("echo 'User ID mismatch.  lond must be run as user www.' |\
1.35      harris41  628:  mailto $emailto -s '$subj' > /dev/null");
                    629:    exit 1;
                    630: }
                    631: 
1.19      www       632: # --------------------------------------------- Check if other instance running
                    633: 
                    634: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
                    635: 
                    636: if (-e $pidfile) {
                    637:    my $lfh=IO::File->new("$pidfile");
                    638:    my $pide=<$lfh>;
                    639:    chomp($pide);
1.29      harris41  640:    if (kill 0 => $pide) { die "already running"; }
1.19      www       641: }
1.1       albertel  642: 
                    643: # ------------------------------------------------------------- Read hosts file
                    644: 
                    645: 
                    646: 
                    647: # establish SERVER socket, bind and listen.
                    648: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                    649:                                 Type      => SOCK_STREAM,
                    650:                                 Proto     => 'tcp',
                    651:                                 Reuse     => 1,
                    652:                                 Listen    => 10 )
1.29      harris41  653:   or die "making socket: $@\n";
1.1       albertel  654: 
                    655: # --------------------------------------------------------- Do global variables
                    656: 
                    657: # global variables
                    658: 
1.134     albertel  659: my %children               = ();       # keys are current child process IDs
                    660: my $children               = 0;        # current number of children
1.1       albertel  661: 
                    662: sub REAPER {                        # takes care of dead children
                    663:     $SIG{CHLD} = \&REAPER;
1.165     albertel  664:     &status("Handling child death");
1.1       albertel  665:     my $pid = wait;
1.67      albertel  666:     if (defined($children{$pid})) {
                    667: 	&logthis("Child $pid died");
                    668: 	$children --;
                    669: 	delete $children{$pid};
                    670:     } else {
                    671: 	&logthis("Unknown Child $pid died");
                    672:     }
1.165     albertel  673:     &status("Finished Handling child death");
1.1       albertel  674: }
                    675: 
                    676: sub HUNTSMAN {                      # signal handler for SIGINT
1.165     albertel  677:     &status("Killing children (INT)");
1.1       albertel  678:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                    679:     kill 'INT' => keys %children;
1.59      www       680:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1       albertel  681:     my $execdir=$perlvar{'lonDaemons'};
                    682:     unlink("$execdir/logs/lond.pid");
1.9       www       683:     &logthis("<font color=red>CRITICAL: Shutting down</font>");
1.165     albertel  684:     &status("Done killing children");
1.1       albertel  685:     exit;                           # clean up with dignity
                    686: }
                    687: 
                    688: sub HUPSMAN {                      # signal handler for SIGHUP
                    689:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
1.165     albertel  690:     &status("Killing children for restart (HUP)");
1.1       albertel  691:     kill 'INT' => keys %children;
1.59      www       692:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.9       www       693:     &logthis("<font color=red>CRITICAL: Restarting</font>");
1.134     albertel  694:     my $execdir=$perlvar{'lonDaemons'};
1.30      harris41  695:     unlink("$execdir/logs/lond.pid");
1.165     albertel  696:     &status("Restarting self (HUP)");
1.1       albertel  697:     exec("$execdir/lond");         # here we go again
                    698: }
                    699: 
1.144     foxr      700: #
1.148     foxr      701: #    Kill off hashes that describe the host table prior to re-reading it.
                    702: #    Hashes affected are:
                    703: #       %hostid, %hostdom %hostip
                    704: #
                    705: sub KillHostHashes {
                    706:     foreach my $key (keys %hostid) {
                    707: 	delete $hostid{$key};
                    708:     }
                    709:     foreach my $key (keys %hostdom) {
                    710: 	delete $hostdom{$key};
                    711:     }
                    712:     foreach my $key (keys %hostip) {
                    713: 	delete $hostip{$key};
                    714:     }
                    715: }
                    716: #
                    717: #   Read in the host table from file and distribute it into the various hashes:
                    718: #
                    719: #    - %hostid  -  Indexed by IP, the loncapa hostname.
                    720: #    - %hostdom -  Indexed by  loncapa hostname, the domain.
                    721: #    - %hostip  -  Indexed by hostid, the Ip address of the host.
                    722: sub ReadHostTable {
                    723: 
                    724:     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
                    725:     
                    726:     while (my $configline=<CONFIG>) {
                    727: 	my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
                    728: 	chomp($ip); $ip=~s/\D+$//;
                    729: 	$hostid{$ip}=$id;
                    730: 	$hostdom{$id}=$domain;
                    731: 	$hostip{$id}=$ip;
                    732: 	if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
                    733:     }
                    734:     close(CONFIG);
                    735: }
                    736: #
                    737: #  Reload the Apache daemon's state.
1.150     foxr      738: #  This is done by invoking /home/httpd/perl/apachereload
                    739: #  a setuid perl script that can be root for us to do this job.
1.148     foxr      740: #
                    741: sub ReloadApache {
1.150     foxr      742:     my $execdir = $perlvar{'lonDaemons'};
                    743:     my $script  = $execdir."/apachereload";
                    744:     system($script);
1.148     foxr      745: }
                    746: 
                    747: #
1.144     foxr      748: #   Called in response to a USR2 signal.
                    749: #   - Reread hosts.tab
                    750: #   - All children connected to hosts that were removed from hosts.tab
                    751: #     are killed via SIGINT
                    752: #   - All children connected to previously existing hosts are sent SIGUSR1
                    753: #   - Our internal hosts hash is updated to reflect the new contents of
                    754: #     hosts.tab causing connections from hosts added to hosts.tab to
                    755: #     now be honored.
                    756: #
                    757: sub UpdateHosts {
1.165     albertel  758:     &status("Reload hosts.tab");
1.147     foxr      759:     logthis('<font color="blue"> Updating connections </font>');
1.148     foxr      760:     #
                    761:     #  The %children hash has the set of IP's we currently have children
                    762:     #  on.  These need to be matched against records in the hosts.tab
                    763:     #  Any ip's no longer in the table get killed off they correspond to
                    764:     #  either dropped or changed hosts.  Note that the re-read of the table
                    765:     #  will take care of new and changed hosts as connections come into being.
                    766: 
                    767: 
                    768:     KillHostHashes;
                    769:     ReadHostTable;
                    770: 
                    771:     foreach my $child (keys %children) {
                    772: 	my $childip = $children{$child};
                    773: 	if(!$hostid{$childip}) {
1.149     foxr      774: 	    logthis('<font color="blue"> UpdateHosts killing child '
                    775: 		    ." $child for ip $childip </font>");
1.148     foxr      776: 	    kill('INT', $child);
1.149     foxr      777: 	} else {
                    778: 	    logthis('<font color="green"> keeping child for ip '
                    779: 		    ." $childip (pid=$child) </font>");
1.148     foxr      780: 	}
                    781:     }
                    782:     ReloadApache;
1.165     albertel  783:     &status("Finished reloading hosts.tab");
1.144     foxr      784: }
                    785: 
1.148     foxr      786: 
1.57      www       787: sub checkchildren {
1.165     albertel  788:     &status("Checking on the children (sending signals)");
1.57      www       789:     &initnewstatus();
                    790:     &logstatus();
                    791:     &logthis('Going to check on the children');
1.134     albertel  792:     my $docdir=$perlvar{'lonDocRoot'};
1.61      harris41  793:     foreach (sort keys %children) {
1.57      www       794: 	sleep 1;
                    795:         unless (kill 'USR1' => $_) {
                    796: 	    &logthis ('Child '.$_.' is dead');
                    797:             &logstatus($$.' is dead');
                    798:         } 
1.61      harris41  799:     }
1.63      www       800:     sleep 5;
1.113     albertel  801:     $SIG{ALRM} = sub { die "timeout" };
                    802:     $SIG{__DIE__} = 'DEFAULT';
1.165     albertel  803:     &status("Checking on the children (waiting for reports)");
1.63      www       804:     foreach (sort keys %children) {
                    805:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.113     albertel  806:           eval {
                    807:             alarm(300);
1.63      www       808: 	    &logthis('Child '.$_.' did not respond');
1.67      albertel  809: 	    kill 9 => $_;
1.131     albertel  810: 	    #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                    811: 	    #$subj="LON: $currenthostid killed lond process $_";
                    812: 	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
                    813: 	    #$execdir=$perlvar{'lonDaemons'};
                    814: 	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
1.113     albertel  815: 	    alarm(0);
                    816: 	  }
1.63      www       817:         }
                    818:     }
1.113     albertel  819:     $SIG{ALRM} = 'DEFAULT';
1.155     albertel  820:     $SIG{__DIE__} = \&catchexception;
1.165     albertel  821:     &status("Finished checking children");
1.57      www       822: }
                    823: 
1.1       albertel  824: # --------------------------------------------------------------------- Logging
                    825: 
                    826: sub logthis {
                    827:     my $message=shift;
                    828:     my $execdir=$perlvar{'lonDaemons'};
                    829:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
                    830:     my $now=time;
                    831:     my $local=localtime($now);
1.58      www       832:     $lastlog=$local.': '.$message;
1.1       albertel  833:     print $fh "$local ($$): $message\n";
                    834: }
                    835: 
1.77      foxr      836: # ------------------------- Conditional log if $DEBUG true.
                    837: sub Debug {
                    838:     my $message = shift;
                    839:     if($DEBUG) {
                    840: 	&logthis($message);
                    841:     }
                    842: }
1.161     foxr      843: 
                    844: #
                    845: #   Sub to do replies to client.. this gives a hook for some
                    846: #   debug tracing too:
                    847: #  Parameters:
                    848: #     fd      - File open on client.
                    849: #     reply   - Text to send to client.
                    850: #     request - Original request from client.
                    851: #
                    852: sub Reply {
                    853:     my $fd      = shift;
                    854:     my $reply   = shift;
                    855:     my $request = shift;
                    856: 
                    857:     print $fd $reply;
                    858:     Debug("Request was $request  Reply was $reply");
                    859: 
                    860: }
1.57      www       861: # ------------------------------------------------------------------ Log status
                    862: 
                    863: sub logstatus {
1.165     albertel  864:     &status("Doing logging");
1.57      www       865:     my $docdir=$perlvar{'lonDocRoot'};
1.63      www       866:     {
1.57      www       867:     my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
1.115     albertel  868:     print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";
1.63      www       869:     $fh->close();
                    870:     }
1.165     albertel  871:     &status("Finished londstatus.txt");
1.63      www       872:     {
                    873: 	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
                    874:         print $fh $status."\n".$lastlog."\n".time;
                    875:         $fh->close();
                    876:     }
1.165     albertel  877:     &status("Finished logging");
1.57      www       878: }
                    879: 
                    880: sub initnewstatus {
                    881:     my $docdir=$perlvar{'lonDocRoot'};
                    882:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
                    883:     my $now=time;
                    884:     my $local=localtime($now);
                    885:     print $fh "LOND status $local - parent $$\n\n";
1.64      www       886:     opendir(DIR,"$docdir/lon-status/londchld");
1.134     albertel  887:     while (my $filename=readdir(DIR)) {
1.64      www       888:         unlink("$docdir/lon-status/londchld/$filename");
                    889:     }
                    890:     closedir(DIR);
1.57      www       891: }
                    892: 
                    893: # -------------------------------------------------------------- Status setting
                    894: 
                    895: sub status {
                    896:     my $what=shift;
                    897:     my $now=time;
                    898:     my $local=localtime($now);
                    899:     $status=$local.': '.$what;
1.103     www       900:     $0='lond: '.$what.' '.$local;
1.57      www       901: }
1.11      www       902: 
                    903: # -------------------------------------------------------- Escape Special Chars
                    904: 
                    905: sub escape {
                    906:     my $str=shift;
                    907:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
                    908:     return $str;
                    909: }
                    910: 
                    911: # ----------------------------------------------------- Un-Escape Special Chars
                    912: 
                    913: sub unescape {
                    914:     my $str=shift;
                    915:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                    916:     return $str;
                    917: }
                    918: 
1.1       albertel  919: # ----------------------------------------------------------- Send USR1 to lonc
                    920: 
                    921: sub reconlonc {
                    922:     my $peerfile=shift;
                    923:     &logthis("Trying to reconnect for $peerfile");
                    924:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
                    925:     if (my $fh=IO::File->new("$loncfile")) {
                    926: 	my $loncpid=<$fh>;
                    927:         chomp($loncpid);
                    928:         if (kill 0 => $loncpid) {
                    929: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
                    930:             kill USR1 => $loncpid;
                    931:         } else {
1.9       www       932: 	    &logthis(
                    933:               "<font color=red>CRITICAL: "
                    934:              ."lonc at pid $loncpid not responding, giving up</font>");
1.1       albertel  935:         }
                    936:     } else {
1.9       www       937:       &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
1.1       albertel  938:     }
                    939: }
                    940: 
                    941: # -------------------------------------------------- Non-critical communication
1.11      www       942: 
1.1       albertel  943: sub subreply {
                    944:     my ($cmd,$server)=@_;
                    945:     my $peerfile="$perlvar{'lonSockDir'}/$server";
                    946:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                    947:                                       Type    => SOCK_STREAM,
                    948:                                       Timeout => 10)
                    949:        or return "con_lost";
                    950:     print $sclient "$cmd\n";
                    951:     my $answer=<$sclient>;
                    952:     chomp($answer);
                    953:     if (!$answer) { $answer="con_lost"; }
                    954:     return $answer;
                    955: }
                    956: 
                    957: sub reply {
                    958:   my ($cmd,$server)=@_;
                    959:   my $answer;
1.115     albertel  960:   if ($server ne $currenthostid) { 
1.1       albertel  961:     $answer=subreply($cmd,$server);
                    962:     if ($answer eq 'con_lost') {
                    963: 	$answer=subreply("ping",$server);
                    964:         if ($answer ne $server) {
1.115     albertel  965: 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
1.1       albertel  966:            &reconlonc("$perlvar{'lonSockDir'}/$server");
                    967:         }
                    968:         $answer=subreply($cmd,$server);
                    969:     }
                    970:   } else {
                    971:     $answer='self_reply';
                    972:   } 
                    973:   return $answer;
                    974: }
                    975: 
1.13      www       976: # -------------------------------------------------------------- Talk to lonsql
                    977: 
1.12      harris41  978: sub sqlreply {
                    979:     my ($cmd)=@_;
                    980:     my $answer=subsqlreply($cmd);
                    981:     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
                    982:     return $answer;
                    983: }
                    984: 
                    985: sub subsqlreply {
                    986:     my ($cmd)=@_;
                    987:     my $unixsock="mysqlsock";
                    988:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
                    989:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                    990:                                       Type    => SOCK_STREAM,
                    991:                                       Timeout => 10)
                    992:        or return "con_lost";
                    993:     print $sclient "$cmd\n";
                    994:     my $answer=<$sclient>;
                    995:     chomp($answer);
                    996:     if (!$answer) { $answer="con_lost"; }
                    997:     return $answer;
                    998: }
                    999: 
1.1       albertel 1000: # -------------------------------------------- Return path to profile directory
1.11      www      1001: 
1.1       albertel 1002: sub propath {
                   1003:     my ($udom,$uname)=@_;
                   1004:     $udom=~s/\W//g;
                   1005:     $uname=~s/\W//g;
1.16      www      1006:     my $subdir=$uname.'__';
1.1       albertel 1007:     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
                   1008:     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
                   1009:     return $proname;
                   1010: } 
                   1011: 
                   1012: # --------------------------------------- Is this the home server of an author?
1.11      www      1013: 
1.1       albertel 1014: sub ishome {
                   1015:     my $author=shift;
                   1016:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                   1017:     my ($udom,$uname)=split(/\//,$author);
                   1018:     my $proname=propath($udom,$uname);
                   1019:     if (-e $proname) {
                   1020: 	return 'owner';
                   1021:     } else {
                   1022:         return 'not_owner';
                   1023:     }
                   1024: }
                   1025: 
                   1026: # ======================================================= Continue main program
                   1027: # ---------------------------------------------------- Fork once and dissociate
                   1028: 
1.134     albertel 1029: my $fpid=fork;
1.1       albertel 1030: exit if $fpid;
1.29      harris41 1031: die "Couldn't fork: $!" unless defined ($fpid);
1.1       albertel 1032: 
1.29      harris41 1033: POSIX::setsid() or die "Can't start new session: $!";
1.1       albertel 1034: 
                   1035: # ------------------------------------------------------- Write our PID on disk
                   1036: 
1.134     albertel 1037: my $execdir=$perlvar{'lonDaemons'};
1.1       albertel 1038: open (PIDSAVE,">$execdir/logs/lond.pid");
                   1039: print PIDSAVE "$$\n";
                   1040: close(PIDSAVE);
1.9       www      1041: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
1.57      www      1042: &status('Starting');
1.1       albertel 1043: 
1.106     foxr     1044: 
1.1       albertel 1045: 
                   1046: # ----------------------------------------------------- Install signal handlers
                   1047: 
1.57      www      1048: 
1.1       albertel 1049: $SIG{CHLD} = \&REAPER;
                   1050: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   1051: $SIG{HUP}  = \&HUPSMAN;
1.57      www      1052: $SIG{USR1} = \&checkchildren;
1.144     foxr     1053: $SIG{USR2} = \&UpdateHosts;
1.106     foxr     1054: 
1.148     foxr     1055: #  Read the host hashes:
                   1056: 
                   1057: ReadHostTable;
1.106     foxr     1058: 
                   1059: # --------------------------------------------------------------
                   1060: #   Accept connections.  When a connection comes in, it is validated
                   1061: #   and if good, a child process is created to process transactions
                   1062: #   along the connection.
                   1063: 
1.1       albertel 1064: while (1) {
1.165     albertel 1065:     &status('Starting accept');
1.106     foxr     1066:     $client = $server->accept() or next;
1.165     albertel 1067:     &status('Accepted '.$client.' off to spawn');
1.106     foxr     1068:     make_new_child($client);
1.165     albertel 1069:     &status('Finished spawning');
1.1       albertel 1070: }
                   1071: 
                   1072: sub make_new_child {
                   1073:     my $pid;
                   1074:     my $cipher;
                   1075:     my $sigset;
1.106     foxr     1076: 
                   1077:     $client = shift;
1.165     albertel 1078:     &status('Starting new child '.$client);
1.161     foxr     1079:     &logthis('<font color="green"> Attempting to start child ('.$client.
                   1080: 	     ")</font>");    
1.1       albertel 1081:     # block signal for fork
                   1082:     $sigset = POSIX::SigSet->new(SIGINT);
                   1083:     sigprocmask(SIG_BLOCK, $sigset)
1.29      harris41 1084:         or die "Can't block SIGINT for fork: $!\n";
1.134     albertel 1085: 
1.29      harris41 1086:     die "fork: $!" unless defined ($pid = fork);
1.148     foxr     1087: 
                   1088:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                   1089: 	                               # connection liveness.
                   1090: 
                   1091:     #
                   1092:     #  Figure out who we're talking to so we can record the peer in 
                   1093:     #  the pid hash.
                   1094:     #
                   1095:     my $caller = getpeername($client);
                   1096:     my ($port,$iaddr)=unpack_sockaddr_in($caller);
                   1097:     $clientip=inet_ntoa($iaddr);
1.1       albertel 1098:     
                   1099:     if ($pid) {
                   1100:         # Parent records the child's birth and returns.
                   1101:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 1102:             or die "Can't unblock SIGINT for fork: $!\n";
1.148     foxr     1103:         $children{$pid} = $clientip;
1.1       albertel 1104:         $children++;
1.57      www      1105:         &status('Started child '.$pid);
1.1       albertel 1106:         return;
                   1107:     } else {
                   1108:         # Child can *not* return from this subroutine.
                   1109:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
1.126     albertel 1110:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
                   1111:                                 #don't get intercepted
1.57      www      1112:         $SIG{USR1}= \&logstatus;
1.63      www      1113:         $SIG{ALRM}= \&timeout;
1.57      www      1114:         $lastlog='Forked ';
                   1115:         $status='Forked';
                   1116: 
1.1       albertel 1117:         # unblock signals
                   1118:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 1119:             or die "Can't unblock SIGINT for fork: $!\n";
1.13      www      1120: 
1.134     albertel 1121:         my $tmpsnum=0;
1.91      albertel 1122: #---------------------------------------------------- kerberos 5 initialization
                   1123:         &Authen::Krb5::init_context();
                   1124:         &Authen::Krb5::init_ets();
                   1125: 
1.161     foxr     1126: 	&status('Accepted connection');
1.1       albertel 1127: # =============================================================================
                   1128:             # do something with the connection
                   1129: # -----------------------------------------------------------------------------
1.148     foxr     1130: 	# see if we know client and check for spoof IP by challenge
                   1131: 
1.161     foxr     1132: 	ReadManagerTable;	# May also be a manager!!
                   1133: 	
                   1134: 	my $clientrec=($hostid{$clientip}     ne undef);
                   1135: 	my $ismanager=($managers{$clientip}    ne undef);
                   1136: 	$clientname  = "[unknonwn]";
                   1137: 	if($clientrec) {	# Establish client type.
                   1138: 	    $ConnectionType = "client";
                   1139: 	    $clientname = $hostid{$clientip};
                   1140: 	    if($ismanager) {
                   1141: 		$ConnectionType = "both";
                   1142: 	    }
                   1143: 	} else {
                   1144: 	    $ConnectionType = "manager";
                   1145: 	    $clientname = $managers{$clientip};
                   1146: 	}
                   1147: 	my $clientok;
                   1148: 	if ($clientrec || $ismanager) {
                   1149: 	    &status("Waiting for init from $clientip $clientname");
                   1150: 	    &logthis('<font color="yellow">INFO: Connection, '.
                   1151: 		     $clientip.
                   1152: 		  " ($clientname) connection type = $ConnectionType </font>" );
                   1153: 	    &status("Connecting $clientip  ($clientname))"); 
                   1154: 	    my $remotereq=<$client>;
                   1155: 	    $remotereq=~s/[^\w:]//g;
                   1156: 	    if ($remotereq =~ /^init/) {
                   1157: 		&sethost("sethost:$perlvar{'lonHostID'}");
                   1158: 		my $challenge="$$".time;
                   1159: 		print $client "$challenge\n";
                   1160: 		&status(
                   1161: 			"Waiting for challenge reply from $clientip ($clientname)"); 
                   1162: 		$remotereq=<$client>;
                   1163: 		$remotereq=~s/\W//g;
                   1164: 		if ($challenge eq $remotereq) {
                   1165: 		    $clientok=1;
                   1166: 		    print $client "ok\n";
                   1167: 		} else {
                   1168: 		    &logthis(
                   1169: 			     "<font color=blue>WARNING: $clientip did not reply challenge</font>");
                   1170: 		    &status('No challenge reply '.$clientip);
                   1171: 		}
1.2       www      1172: 	    } else {
1.161     foxr     1173: 		&logthis(
                   1174: 			 "<font color=blue>WARNING: "
                   1175: 			 ."$clientip failed to initialize: >$remotereq< </font>");
                   1176: 		&status('No init '.$clientip);
                   1177: 	    }
                   1178: 	} else {
                   1179: 	    &logthis(
                   1180: 		     "<font color=blue>WARNING: Unknown client $clientip</font>");
                   1181: 	    &status('Hung up on '.$clientip);
                   1182: 	}
                   1183: 	if ($clientok) {
1.1       albertel 1184: # ---------------- New known client connecting, could mean machine online again
1.161     foxr     1185: 	    
                   1186: 	    foreach my $id (keys(%hostip)) {
                   1187: 		if ($hostip{$id} ne $clientip ||
                   1188: 		    $hostip{$currenthostid} eq $clientip) {
                   1189: 		    # no need to try to do recon's to myself
                   1190: 		    next;
1.115     albertel 1191: 		}
1.161     foxr     1192: 		&reconlonc("$perlvar{'lonSockDir'}/$id");
                   1193: 	    }
                   1194: 	    &logthis("<font color=green>Established connection: $clientname</font>");
                   1195: 	    &status('Will listen to '.$clientname);
1.1       albertel 1196: # ------------------------------------------------------------ Process requests
1.161     foxr     1197: 	    while (my $userinput=<$client>) {
1.1       albertel 1198:                 chomp($userinput);
1.79      foxr     1199: 		Debug("Request = $userinput\n");
1.161     foxr     1200:                 &status('Processing '.$clientname.': '.$userinput);
1.1       albertel 1201:                 my $wasenc=0;
1.63      www      1202:                 alarm(120);
1.1       albertel 1203: # ------------------------------------------------------------ See if encrypted
                   1204: 		if ($userinput =~ /^enc/) {
1.161     foxr     1205: 		    if ($cipher) {
                   1206: 			my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
                   1207: 			$userinput='';
                   1208: 			for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
                   1209: 			    $userinput.=
                   1210: 				$cipher->decrypt(
                   1211: 						 pack("H16",substr($encinput,$encidx,16))
                   1212: 						 );
                   1213: 			}
                   1214: 			$userinput=substr($userinput,0,$cmdlength);
                   1215: 			$wasenc=1;
1.1       albertel 1216: 		    }
                   1217: 		}
1.161     foxr     1218: 		
1.1       albertel 1219: # ------------------------------------------------------------- Normal commands
                   1220: # ------------------------------------------------------------------------ ping
1.161     foxr     1221: 		if ($userinput =~ /^ping/) {	# client only
                   1222: 		    if(isClient) {
                   1223: 			print $client "$currenthostid\n";
                   1224: 		    } else {
                   1225: 			Reply($client, "refused\n", $userinput);
                   1226: 		    }
1.1       albertel 1227: # ------------------------------------------------------------------------ pong
1.161     foxr     1228: 		}elsif ($userinput =~ /^pong/) { # client only
                   1229: 		    if(isClient) {
                   1230: 			my $reply=&reply("ping",$clientname);
                   1231: 			print $client "$currenthostid:$reply\n"; 
                   1232: 		    } else {
                   1233: 			Reply($client, "refused\n", $userinput);
                   1234: 		    }
1.1       albertel 1235: # ------------------------------------------------------------------------ ekey
1.161     foxr     1236: 		} elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs
                   1237: 		    my $buildkey=time.$$.int(rand 100000);
                   1238: 		    $buildkey=~tr/1-6/A-F/;
                   1239: 		    $buildkey=int(rand 100000).$buildkey.int(rand 100000);
                   1240: 		    my $key=$currenthostid.$clientname;
                   1241: 		    $key=~tr/a-z/A-Z/;
                   1242: 		    $key=~tr/G-P/0-9/;
                   1243: 		    $key=~tr/Q-Z/0-9/;
                   1244: 		    $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
                   1245: 		    $key=substr($key,0,32);
                   1246: 		    my $cipherkey=pack("H32",$key);
                   1247: 		    $cipher=new IDEA $cipherkey;
                   1248: 		    print $client "$buildkey\n"; 
1.1       albertel 1249: # ------------------------------------------------------------------------ load
1.161     foxr     1250: 		} elsif ($userinput =~ /^load/) { # client only
                   1251: 		    if (isClient) {
                   1252: 			my $loadavg;
                   1253: 			{
                   1254: 			    my $loadfile=IO::File->new('/proc/loadavg');
                   1255: 			    $loadavg=<$loadfile>;
                   1256: 			}
                   1257: 			$loadavg =~ s/\s.*//g;
                   1258: 			my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
                   1259: 			print $client "$loadpercent\n";
                   1260: 		    } else {
                   1261: 			Reply($client, "refused\n", $userinput);
                   1262: 	       
                   1263: 		    }
1.127     albertel 1264: # -------------------------------------------------------------------- userload
1.161     foxr     1265: 		} elsif ($userinput =~ /^userload/) { # client only
                   1266: 		    if(isClient) {
                   1267: 			my $userloadpercent=&userload();
                   1268: 			print $client "$userloadpercent\n";
                   1269: 		    } else {
                   1270: 			Reply($client, "refused\n", $userinput);
                   1271: 		     
                   1272: 		    }
1.137     foxr     1273: #
                   1274: #        Transactions requiring encryption:
                   1275: #
1.54      harris41 1276: # ----------------------------------------------------------------- currentauth
1.161     foxr     1277: 		} elsif ($userinput =~ /^currentauth/) {
                   1278: 		    if (($wasenc==1)  && isClient) { # Encoded & client only.
                   1279: 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
                   1280: 			my $result = GetAuthType($udom, $uname);
                   1281: 			if($result eq "nouser") {
                   1282: 			    print $client "unknown_user\n";
                   1283: 			}
                   1284: 			else {
                   1285: 			    print $client "$result\n"
                   1286: 			    }
                   1287: 		    } else {
                   1288: 			Reply($client, "refused\n", $userinput);
                   1289: 			
                   1290: 		    }
1.137     foxr     1291: #--------------------------------------------------------------------- pushfile
1.161     foxr     1292: 		} elsif($userinput =~ /^pushfile/) {	# encoded & manager.
                   1293: 		    if(($wasenc == 1) && isManager) {
                   1294: 			my $cert = GetCertificate($userinput);
                   1295: 			if(ValidManager($cert)) {
                   1296: 			    my $reply = PushFile($userinput);
                   1297: 			    print $client "$reply\n";
                   1298: 			} else {
                   1299: 			    print $client "refused\n";
                   1300: 			} 
                   1301: 		    } else {
                   1302: 			Reply($client, "refused\n", $userinput);
                   1303: 			
                   1304: 		    }
1.137     foxr     1305: #--------------------------------------------------------------------- reinit
1.161     foxr     1306: 		} elsif($userinput =~ /^reinit/) { # Encoded and manager
1.166     foxr     1307: 			if (($wasenc == 1) && isManager) {
                   1308: 				my $cert = GetCertificate($userinput);
                   1309: 				if(ValidManager($cert)) {
                   1310: 					chomp($userinput);
                   1311: 					my $reply = ReinitProcess($userinput);
                   1312: 					print $client  "$reply\n";
                   1313: 				} else {
                   1314: 					 print $client "refused\n";
                   1315: 				}
1.161     foxr     1316: 			} else {
1.166     foxr     1317: 				Reply($client, "refused\n", $userinput);
1.161     foxr     1318: 			}
1.166     foxr     1319: #------------------------------------------------------------------------- edit
                   1320: 		    } elsif ($userinput =~ /^edit/) {    # encoded and manager:
                   1321: 			if(($wasenc ==1) && (isManager)) {
                   1322: 			    my $cert = GetCertificate($userinput);
                   1323: 			    if(ValidManager($cert)) {
                   1324:                my($command, $filetype, $script) = split(/:/, $userinput);
                   1325:                if (($filetype eq "hosts") || ($filetype eq "domain")) {
                   1326:                   if($script ne "") {
1.167     foxr     1327: 		      Reply($client, EditFile($userinput));
1.166     foxr     1328:                   } else {
                   1329:                      Reply($client,"refused\n",$userinput);
                   1330:                   }
                   1331:                } else {
                   1332:                   Reply($client,"refused\n",$userinput);
                   1333:                }
                   1334:             } else {
                   1335:                Reply($client,"refused\n",$userinput);
                   1336:             }
                   1337:          } else {
                   1338: 	     Reply($client,"refused\n",$userinput);
                   1339: 	 }
1.1       albertel 1340: # ------------------------------------------------------------------------ auth
1.166     foxr     1341: 		    } elsif ($userinput =~ /^auth/) { # Encoded and client only.
1.161     foxr     1342: 		    if (($wasenc==1) && isClient) {
                   1343: 			my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
                   1344: 			chomp($upass);
                   1345: 			$upass=unescape($upass);
                   1346: 			my $proname=propath($udom,$uname);
                   1347: 			my $passfilename="$proname/passwd";
                   1348: 			if (-e $passfilename) {
                   1349: 			    my $pf = IO::File->new($passfilename);
                   1350: 			    my $realpasswd=<$pf>;
                   1351: 			    chomp($realpasswd);
                   1352: 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   1353: 			    my $pwdcorrect=0;
                   1354: 			    if ($howpwd eq 'internal') {
                   1355: 				&Debug("Internal auth");
                   1356: 				$pwdcorrect=
                   1357: 				    (crypt($upass,$contentpwd) eq $contentpwd);
                   1358: 			    } elsif ($howpwd eq 'unix') {
                   1359: 				&Debug("Unix auth");
                   1360: 				if((getpwnam($uname))[1] eq "") { #no such user!
                   1361: 				    $pwdcorrect = 0;
                   1362: 				} else {
                   1363: 				    $contentpwd=(getpwnam($uname))[1];
                   1364: 				    my $pwauth_path="/usr/local/sbin/pwauth";
                   1365: 				    unless ($contentpwd eq 'x') {
                   1366: 					$pwdcorrect=
                   1367: 					    (crypt($upass,$contentpwd) eq 
                   1368: 					     $contentpwd);
                   1369: 				    }
                   1370: 				    
                   1371: 				    elsif (-e $pwauth_path) {
                   1372: 					open PWAUTH, "|$pwauth_path" or
                   1373: 					    die "Cannot invoke authentication";
                   1374: 					print PWAUTH "$uname\n$upass\n";
                   1375: 					close PWAUTH;
                   1376: 					$pwdcorrect=!$?;
                   1377: 				    }
                   1378: 				}
                   1379: 			    } elsif ($howpwd eq 'krb4') {
                   1380: 				my $null=pack("C",0);
                   1381: 				unless ($upass=~/$null/) {
                   1382: 				    my $krb4_error = &Authen::Krb4::get_pw_in_tkt
                   1383: 					($uname,"",$contentpwd,'krbtgt',
                   1384: 					 $contentpwd,1,$upass);
                   1385: 				    if (!$krb4_error) {
                   1386: 					$pwdcorrect = 1;
                   1387: 				    } else { 
                   1388: 					$pwdcorrect=0; 
                   1389: 					# log error if it is not a bad password
                   1390: 					if ($krb4_error != 62) {
                   1391: 					    &logthis('krb4:'.$uname.','.$contentpwd.','.
                   1392: 						     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
                   1393: 					}
                   1394: 				    }
                   1395: 				}
                   1396: 			    } elsif ($howpwd eq 'krb5') {
                   1397: 				my $null=pack("C",0);
                   1398: 				unless ($upass=~/$null/) {
                   1399: 				    my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
                   1400: 				    my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
                   1401: 				    my $krbserver=&Authen::Krb5::parse_name($krbservice);
                   1402: 				    my $credentials=&Authen::Krb5::cc_default();
                   1403: 				    $credentials->initialize($krbclient);
                   1404: 				    my $krbreturn = 
                   1405: 					&Authen::Krb5::get_in_tkt_with_password(
                   1406: 										$krbclient,$krbserver,$upass,$credentials);
1.92      albertel 1407: #				  unless ($krbreturn) {
                   1408: #				      &logthis("Krb5 Error: ".
                   1409: #					       &Authen::Krb5::error());
                   1410: #				  }
1.161     foxr     1411: 				    $pwdcorrect = ($krbreturn == 1);
                   1412: 				} else { $pwdcorrect=0; }
                   1413: 			    } elsif ($howpwd eq 'localauth') {
                   1414: 				$pwdcorrect=&localauth::localauth($uname,$upass,
                   1415: 								  $contentpwd);
                   1416: 			    }
                   1417: 			    if ($pwdcorrect) {
                   1418: 				print $client "authorized\n";
                   1419: 			    } else {
                   1420: 				print $client "non_authorized\n";
                   1421: 			    }  
                   1422: 			} else {
                   1423: 			    print $client "unknown_user\n";
                   1424: 			}
                   1425: 		    } else {
                   1426: 			Reply($client, "refused\n", $userinput);
                   1427: 		       
                   1428: 		    }
1.1       albertel 1429: # ---------------------------------------------------------------------- passwd
1.161     foxr     1430: 		} elsif ($userinput =~ /^passwd/) { # encoded and client
                   1431: 		    if (($wasenc==1) && isClient) {
                   1432: 			my 
                   1433: 			    ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
                   1434: 			chomp($npass);
                   1435: 			$upass=&unescape($upass);
                   1436: 			$npass=&unescape($npass);
                   1437: 			&Debug("Trying to change password for $uname");
                   1438: 			my $proname=propath($udom,$uname);
                   1439: 			my $passfilename="$proname/passwd";
                   1440: 			if (-e $passfilename) {
                   1441: 			    my $realpasswd;
                   1442: 			    { my $pf = IO::File->new($passfilename);
                   1443: 			      $realpasswd=<$pf>; }
                   1444: 			    chomp($realpasswd);
                   1445: 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   1446: 			    if ($howpwd eq 'internal') {
                   1447: 				&Debug("internal auth");
                   1448: 				if (crypt($upass,$contentpwd) eq $contentpwd) {
                   1449: 				    my $salt=time;
                   1450: 				    $salt=substr($salt,6,2);
                   1451: 				    my $ncpass=crypt($npass,$salt);
                   1452: 				    {
                   1453: 					my $pf;
                   1454: 					if ($pf = IO::File->new(">$passfilename")) {
                   1455: 					    print $pf "internal:$ncpass\n";
                   1456: 					    &logthis("Result of password change for $uname: pwchange_success");
                   1457: 					    print $client "ok\n";
                   1458: 					} else {
                   1459: 					    &logthis("Unable to open $uname passwd to change password");
                   1460: 					    print $client "non_authorized\n";
                   1461: 					}
                   1462: 				    }             
                   1463: 				    
                   1464: 				} else {
                   1465: 				    print $client "non_authorized\n";
                   1466: 				}
                   1467: 			    } elsif ($howpwd eq 'unix') {
                   1468: 				# Unix means we have to access /etc/password
                   1469: 				# one way or another.
                   1470: 				# First: Make sure the current password is
                   1471: 				#        correct
                   1472: 				&Debug("auth is unix");
                   1473: 				$contentpwd=(getpwnam($uname))[1];
                   1474: 				my $pwdcorrect = "0";
                   1475: 				my $pwauth_path="/usr/local/sbin/pwauth";
                   1476: 				unless ($contentpwd eq 'x') {
                   1477: 				    $pwdcorrect=
                   1478: 					(crypt($upass,$contentpwd) eq $contentpwd);
                   1479: 				} elsif (-e $pwauth_path) {
                   1480: 				    open PWAUTH, "|$pwauth_path" or
                   1481: 					die "Cannot invoke authentication";
                   1482: 				    print PWAUTH "$uname\n$upass\n";
                   1483: 				    close PWAUTH;
                   1484: 				    &Debug("exited pwauth with $? ($uname,$upass) ");
                   1485: 				    $pwdcorrect=($? == 0);
                   1486: 				}
                   1487: 				if ($pwdcorrect) {
                   1488: 				    my $execdir=$perlvar{'lonDaemons'};
                   1489: 				    &Debug("Opening lcpasswd pipeline");
                   1490: 				    my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
                   1491: 				    print $pf "$uname\n$npass\n$npass\n";
                   1492: 				    close $pf;
                   1493: 				    my $err = $?;
                   1494: 				    my $result = ($err>0 ? 'pwchange_failure' 
                   1495: 						  : 'ok');
                   1496: 				    &logthis("Result of password change for $uname: ".
                   1497: 					     &lcpasswdstrerror($?));
                   1498: 				    print $client "$result\n";
                   1499: 				} else {
                   1500: 				    print $client "non_authorized\n";
                   1501: 				}
                   1502: 			    } else {
                   1503: 				print $client "auth_mode_error\n";
                   1504: 			    }  
                   1505: 			} else {
                   1506: 			    print $client "unknown_user\n";
                   1507: 			}
                   1508: 		    } else {
                   1509: 			Reply($client, "refused\n", $userinput);
                   1510: 		       
                   1511: 		    }
1.31      www      1512: # -------------------------------------------------------------------- makeuser
1.161     foxr     1513: 		} elsif ($userinput =~ /^makeuser/) { # encoded and client.
                   1514: 		    &Debug("Make user received");
                   1515: 		    my $oldumask=umask(0077);
                   1516: 		    if (($wasenc==1) && isClient) {
                   1517: 			my 
                   1518: 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
                   1519: 			&Debug("cmd =".$cmd." $udom =".$udom.
                   1520: 			       " uname=".$uname);
                   1521: 			chomp($npass);
                   1522: 			$npass=&unescape($npass);
                   1523: 			my $proname=propath($udom,$uname);
                   1524: 			my $passfilename="$proname/passwd";
                   1525: 			&Debug("Password file created will be:".
                   1526: 			       $passfilename);
                   1527: 			if (-e $passfilename) {
                   1528: 			    print $client "already_exists\n";
                   1529: 			} elsif ($udom ne $currentdomainid) {
                   1530: 			    print $client "not_right_domain\n";
                   1531: 			} else {
                   1532: 			    my @fpparts=split(/\//,$proname);
                   1533: 			    my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
                   1534: 			    my $fperror='';
                   1535: 			    for (my $i=3;$i<=$#fpparts;$i++) {
                   1536: 				$fpnow.='/'.$fpparts[$i]; 
                   1537: 				unless (-e $fpnow) {
                   1538: 				    unless (mkdir($fpnow,0777)) {
                   1539: 					$fperror="error: ".($!+0)
                   1540: 					    ." mkdir failed while attempting "
                   1541: 					    ."makeuser\n";
                   1542: 				    }
                   1543: 				}
                   1544: 			    }
                   1545: 			    unless ($fperror) {
                   1546: 				my $result=&make_passwd_file($uname, $umode,$npass,
                   1547: 							     $passfilename);
                   1548: 				print $client $result;
                   1549: 			    } else {
                   1550: 				print $client "$fperror\n";
                   1551: 			    }
                   1552: 			}
                   1553: 		    } else {
                   1554: 			Reply($client, "refused\n", $userinput);
                   1555: 	      
                   1556: 		    }
                   1557: 		    umask($oldumask);
1.55      harris41 1558: # -------------------------------------------------------------- changeuserauth
1.161     foxr     1559: 		} elsif ($userinput =~ /^changeuserauth/) { # encoded & client
                   1560: 		    &Debug("Changing authorization");
                   1561: 		    if (($wasenc==1) && isClient) {
                   1562: 			my 
                   1563: 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
                   1564: 			chomp($npass);
                   1565: 			&Debug("cmd = ".$cmd." domain= ".$udom.
                   1566: 			       "uname =".$uname." umode= ".$umode);
                   1567: 			$npass=&unescape($npass);
                   1568: 			my $proname=&propath($udom,$uname);
                   1569: 			my $passfilename="$proname/passwd";
                   1570: 			if ($udom ne $currentdomainid) {
                   1571: 			    print $client "not_right_domain\n";
                   1572: 			} else {
                   1573: 			    my $result=&make_passwd_file($uname, $umode,$npass,
                   1574: 							 $passfilename);
                   1575: 			    print $client $result;
                   1576: 			}
                   1577: 		    } else {
                   1578: 			Reply($client, "refused\n", $userinput);
                   1579: 		   
                   1580: 		    }
1.1       albertel 1581: # ------------------------------------------------------------------------ home
1.161     foxr     1582: 		} elsif ($userinput =~ /^home/) { # client clear or encoded
                   1583: 		    if(isClient) {
                   1584: 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
                   1585: 			chomp($uname);
                   1586: 			my $proname=propath($udom,$uname);
                   1587: 			if (-e $proname) {
                   1588: 			    print $client "found\n";
                   1589: 			} else {
                   1590: 			    print $client "not_found\n";
                   1591: 			}
                   1592: 		    } else {
                   1593: 			Reply($client, "refused\n", $userinput);
                   1594: 
                   1595: 		    }
1.1       albertel 1596: # ---------------------------------------------------------------------- update
1.161     foxr     1597: 		} elsif ($userinput =~ /^update/) { # client clear or encoded.
                   1598: 		    if(isClient) {
                   1599: 			my ($cmd,$fname)=split(/:/,$userinput);
                   1600: 			my $ownership=ishome($fname);
                   1601: 			if ($ownership eq 'not_owner') {
                   1602: 			    if (-e $fname) {
                   1603: 				my ($dev,$ino,$mode,$nlink,
                   1604: 				    $uid,$gid,$rdev,$size,
                   1605: 				    $atime,$mtime,$ctime,
                   1606: 				    $blksize,$blocks)=stat($fname);
                   1607: 				my $now=time;
                   1608: 				my $since=$now-$atime;
                   1609: 				if ($since>$perlvar{'lonExpire'}) {
                   1610: 				    my $reply=
                   1611: 					&reply("unsub:$fname","$clientname");
                   1612: 				    unlink("$fname");
                   1613: 				} else {
                   1614: 				    my $transname="$fname.in.transfer";
                   1615: 				    my $remoteurl=
                   1616: 					&reply("sub:$fname","$clientname");
                   1617: 				    my $response;
                   1618: 				    {
                   1619: 					my $ua=new LWP::UserAgent;
                   1620: 					my $request=new HTTP::Request('GET',"$remoteurl");
                   1621: 					$response=$ua->request($request,$transname);
                   1622: 				    }
                   1623: 				    if ($response->is_error()) {
                   1624: 					unlink($transname);
                   1625: 					my $message=$response->status_line;
                   1626: 					&logthis(
                   1627: 						 "LWP GET: $message for $fname ($remoteurl)");
                   1628: 				    } else {
                   1629: 					if ($remoteurl!~/\.meta$/) {
                   1630: 					    my $ua=new LWP::UserAgent;
                   1631: 					    my $mrequest=
                   1632: 						new HTTP::Request('GET',$remoteurl.'.meta');
                   1633: 					    my $mresponse=
                   1634: 						$ua->request($mrequest,$fname.'.meta');
                   1635: 					    if ($mresponse->is_error()) {
                   1636: 						unlink($fname.'.meta');
                   1637: 					    }
                   1638: 					}
                   1639: 					rename($transname,$fname);
                   1640: 				    }
                   1641: 				}
                   1642: 				print $client "ok\n";
                   1643: 			    } else {
                   1644: 				print $client "not_found\n";
                   1645: 			    }
                   1646: 			} else {
                   1647: 			    print $client "rejected\n";
                   1648: 			}
                   1649: 		    } else {
                   1650: 			Reply($client, "refused\n", $userinput);
                   1651: 
                   1652: 		    }
1.85      www      1653: # -------------------------------------- fetch a user file from a remote server
1.161     foxr     1654: 		} elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
                   1655: 		    if(isClient) {
                   1656: 			my ($cmd,$fname)=split(/:/,$userinput);
                   1657: 			my ($udom,$uname,$ufile)=split(/\//,$fname);
                   1658: 			my $udir=propath($udom,$uname).'/userfiles';
                   1659: 			unless (-e $udir) { mkdir($udir,0770); }
                   1660: 			if (-e $udir) {
                   1661: 			    $ufile=~s/^[\.\~]+//;
                   1662: 			    $ufile=~s/\///g;
                   1663: 			    my $destname=$udir.'/'.$ufile;
                   1664: 			    my $transname=$udir.'/'.$ufile.'.in.transit';
                   1665: 			    my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
                   1666: 			    my $response;
                   1667: 			    {
                   1668: 				my $ua=new LWP::UserAgent;
                   1669: 				my $request=new HTTP::Request('GET',"$remoteurl");
                   1670: 				$response=$ua->request($request,$transname);
                   1671: 			    }
                   1672: 			    if ($response->is_error()) {
                   1673: 				unlink($transname);
                   1674: 				my $message=$response->status_line;
                   1675: 				&logthis("LWP GET: $message for $fname ($remoteurl)");
                   1676: 				print $client "failed\n";
                   1677: 			    } else {
                   1678: 				if (!rename($transname,$destname)) {
                   1679: 				    &logthis("Unable to move $transname to $destname");
                   1680: 				    unlink($transname);
                   1681: 				    print $client "failed\n";
                   1682: 				} else {
                   1683: 				    print $client "ok\n";
                   1684: 				}
                   1685: 			    }
                   1686: 			} else {
                   1687: 			    print $client "not_home\n";
                   1688: 			}
                   1689: 		    } else {
                   1690: 			Reply($client, "refused\n", $userinput);
                   1691: 
                   1692: 		    }
1.85      www      1693: # ------------------------------------------ authenticate access to a user file
1.161     foxr     1694: 		} elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
                   1695: 		    if(isClient) {
                   1696: 			my ($cmd,$fname,$session)=split(/:/,$userinput);
                   1697: 			chomp($session);
                   1698: 			my $reply='non_auth';
                   1699: 			if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
                   1700: 				 $session.'.id')) {
                   1701: 			    while (my $line=<ENVIN>) {
                   1702: 				if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
                   1703: 			    }
                   1704: 			    close(ENVIN);
                   1705: 			    print $client $reply."\n";
                   1706: 			} else {
                   1707: 			    print $client "invalid_token\n";
                   1708: 			}
                   1709: 		    } else {
                   1710: 			Reply($client, "refused\n", $userinput);
                   1711: 
                   1712: 		    }
1.1       albertel 1713: # ----------------------------------------------------------------- unsubscribe
1.161     foxr     1714: 		} elsif ($userinput =~ /^unsub/) {
                   1715: 		    if(isClient) {
                   1716: 			my ($cmd,$fname)=split(/:/,$userinput);
                   1717: 			if (-e $fname) {
                   1718: 			    print $client &unsub($client,$fname,$clientip);
                   1719: 			} else {
                   1720: 			    print $client "not_found\n";
                   1721: 			}
                   1722: 		    } else {
                   1723: 			Reply($client, "refused\n", $userinput);
                   1724: 
                   1725: 		    }
1.1       albertel 1726: # ------------------------------------------------------------------- subscribe
1.161     foxr     1727: 		} elsif ($userinput =~ /^sub/) {
                   1728: 		    if(isClient) {
                   1729: 			print $client &subscribe($userinput,$clientip);
                   1730: 		    } else {
                   1731: 			Reply($client, "refused\n", $userinput);
                   1732: 
                   1733: 		    }
1.102     www      1734: # ------------------------------------------------------------- current version
1.161     foxr     1735: 		} elsif ($userinput =~ /^currentversion/) {
                   1736: 		    if(isClient) {
                   1737: 			my ($cmd,$fname)=split(/:/,$userinput);
                   1738: 			print $client &currentversion($fname)."\n";
                   1739: 		    } else {
                   1740: 			Reply($client, "refused\n", $userinput);
                   1741: 
                   1742: 		    }
1.12      harris41 1743: # ------------------------------------------------------------------------- log
1.161     foxr     1744: 		} elsif ($userinput =~ /^log/) {
                   1745: 		    if(isClient) {
                   1746: 			my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
                   1747: 			chomp($what);
                   1748: 			my $proname=propath($udom,$uname);
                   1749: 			my $now=time;
                   1750: 			{
                   1751: 			    my $hfh;
                   1752: 			    if ($hfh=IO::File->new(">>$proname/activity.log")) { 
                   1753: 				print $hfh "$now:$clientname:$what\n";
                   1754: 				print $client "ok\n"; 
                   1755: 			    } else {
                   1756: 				print $client "error: ".($!+0)
                   1757: 				    ." IO::File->new Failed "
                   1758: 				    ."while attempting log\n";
                   1759: 			    }
                   1760: 			}
                   1761: 		    } else {
                   1762: 			Reply($client, "refused\n", $userinput);
                   1763: 
                   1764: 		    }
1.1       albertel 1765: # ------------------------------------------------------------------------- put
1.161     foxr     1766: 		} elsif ($userinput =~ /^put/) {
                   1767: 		    if(isClient) {
                   1768: 			my ($cmd,$udom,$uname,$namespace,$what)
                   1769: 			    =split(/:/,$userinput);
                   1770: 			$namespace=~s/\//\_/g;
                   1771: 			$namespace=~s/\W//g;
                   1772: 			if ($namespace ne 'roles') {
                   1773: 			    chomp($what);
                   1774: 			    my $proname=propath($udom,$uname);
                   1775: 			    my $now=time;
                   1776: 			    unless ($namespace=~/^nohist\_/) {
                   1777: 				my $hfh;
                   1778: 				if (
                   1779: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   1780: 				    ) { print $hfh "P:$now:$what\n"; }
                   1781: 			    }
                   1782: 			    my @pairs=split(/\&/,$what);
                   1783: 			    my %hash;
                   1784: 			    if (tie(%hash,'GDBM_File',
                   1785: 				    "$proname/$namespace.db",
                   1786: 				    &GDBM_WRCREAT(),0640)) {
                   1787: 				foreach my $pair (@pairs) {
                   1788: 				    my ($key,$value)=split(/=/,$pair);
                   1789: 				    $hash{$key}=$value;
1.162     matthew  1790: 				}
                   1791: 				if (untie(%hash)) {
                   1792: 				    print $client "ok\n";
                   1793: 				} else {
                   1794: 				    print $client "error: ".($!+0)
                   1795: 					." untie(GDBM) failed ".
                   1796: 					"while attempting put\n";
                   1797: 				}
                   1798: 			    } else {
                   1799: 				print $client "error: ".($!)
                   1800: 				    ." tie(GDBM) Failed ".
                   1801: 				    "while attempting put\n";
                   1802: 			    }
                   1803: 			} else {
                   1804: 			    print $client "refused\n";
                   1805: 			}
                   1806: 		    } else {
                   1807: 			Reply($client, "refused\n", $userinput);
                   1808: 
                   1809: 		    }
                   1810: # ------------------------------------------------------------------- inc
                   1811: 		} elsif ($userinput =~ /^inc:/) {
                   1812: 		    if(isClient) {
                   1813: 			my ($cmd,$udom,$uname,$namespace,$what)
                   1814: 			    =split(/:/,$userinput);
                   1815: 			$namespace=~s/\//\_/g;
                   1816: 			$namespace=~s/\W//g;
                   1817: 			if ($namespace ne 'roles') {
                   1818: 			    chomp($what);
                   1819: 			    my $proname=propath($udom,$uname);
                   1820: 			    my $now=time;
                   1821: 			    unless ($namespace=~/^nohist\_/) {
                   1822: 				my $hfh;
                   1823: 				if (
                   1824: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   1825: 				    ) { print $hfh "P:$now:$what\n"; }
                   1826: 			    }
                   1827: 			    my @pairs=split(/\&/,$what);
                   1828: 			    my %hash;
                   1829: 			    if (tie(%hash,'GDBM_File',
                   1830: 				    "$proname/$namespace.db",
                   1831: 				    &GDBM_WRCREAT(),0640)) {
                   1832: 				foreach my $pair (@pairs) {
                   1833: 				    my ($key,$value)=split(/=/,$pair);
                   1834:                                     # We could check that we have a number...
                   1835:                                     if (! defined($value) || $value eq '') {
                   1836:                                         $value = 1;
                   1837:                                     }
                   1838: 				    $hash{$key}+=$value;
1.161     foxr     1839: 				}
                   1840: 				if (untie(%hash)) {
                   1841: 				    print $client "ok\n";
                   1842: 				} else {
                   1843: 				    print $client "error: ".($!+0)
                   1844: 					." untie(GDBM) failed ".
                   1845: 					"while attempting put\n";
                   1846: 				}
                   1847: 			    } else {
                   1848: 				print $client "error: ".($!)
                   1849: 				    ." tie(GDBM) Failed ".
                   1850: 				    "while attempting put\n";
                   1851: 			    }
                   1852: 			} else {
                   1853: 			    print $client "refused\n";
                   1854: 			}
                   1855: 		    } else {
                   1856: 			Reply($client, "refused\n", $userinput);
                   1857: 
                   1858: 		    }
1.6       www      1859: # -------------------------------------------------------------------- rolesput
1.161     foxr     1860: 		} elsif ($userinput =~ /^rolesput/) {
                   1861: 		    if(isClient) {
                   1862: 			&Debug("rolesput");
                   1863: 			if ($wasenc==1) {
                   1864: 			    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
                   1865: 				=split(/:/,$userinput);
                   1866: 			    &Debug("cmd = ".$cmd." exedom= ".$exedom.
                   1867: 				   "user = ".$exeuser." udom=".$udom.
                   1868: 				   "what = ".$what);
                   1869: 			    my $namespace='roles';
                   1870: 			    chomp($what);
                   1871: 			    my $proname=propath($udom,$uname);
                   1872: 			    my $now=time;
                   1873: 			    {
                   1874: 				my $hfh;
                   1875: 				if (
                   1876: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   1877: 				    ) { 
                   1878: 				    print $hfh "P:$now:$exedom:$exeuser:$what\n";
                   1879: 				}
                   1880: 			    }
                   1881: 			    my @pairs=split(/\&/,$what);
                   1882: 			    my %hash;
                   1883: 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   1884: 				foreach my $pair (@pairs) {
                   1885: 				    my ($key,$value)=split(/=/,$pair);
                   1886: 				    &ManagePermissions($key, $udom, $uname,
                   1887: 						       &GetAuthType( $udom, 
                   1888: 								     $uname));
                   1889: 				    $hash{$key}=$value;
                   1890: 				}
                   1891: 				if (untie(%hash)) {
                   1892: 				    print $client "ok\n";
                   1893: 				} else {
                   1894: 				    print $client "error: ".($!+0)
                   1895: 					." untie(GDBM) Failed ".
                   1896: 					"while attempting rolesput\n";
                   1897: 				}
                   1898: 			    } else {
                   1899: 				print $client "error: ".($!+0)
                   1900: 				    ." tie(GDBM) Failed ".
                   1901: 				    "while attempting rolesput\n";
                   1902: 			    }
                   1903: 			} else {
                   1904: 			    print $client "refused\n";
                   1905: 			}
                   1906: 		    } else {
                   1907: 			Reply($client, "refused\n", $userinput);
                   1908: 		  
                   1909: 		    }
1.117     www      1910: # -------------------------------------------------------------------- rolesdel
1.161     foxr     1911: 		} elsif ($userinput =~ /^rolesdel/) {
                   1912: 		    if(isClient) {
                   1913: 			&Debug("rolesdel");
                   1914: 			if ($wasenc==1) {
                   1915: 			    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
                   1916: 				=split(/:/,$userinput);
                   1917: 			    &Debug("cmd = ".$cmd." exedom= ".$exedom.
                   1918: 				   "user = ".$exeuser." udom=".$udom.
                   1919: 				   "what = ".$what);
                   1920: 			    my $namespace='roles';
                   1921: 			    chomp($what);
                   1922: 			    my $proname=propath($udom,$uname);
                   1923: 			    my $now=time;
                   1924: 			    {
                   1925: 				my $hfh;
                   1926: 				if (
                   1927: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   1928: 				    ) { 
                   1929: 				    print $hfh "D:$now:$exedom:$exeuser:$what\n";
                   1930: 				}
                   1931: 			    }
                   1932: 			    my @rolekeys=split(/\&/,$what);
                   1933: 			    my %hash;
                   1934: 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   1935: 				foreach my $key (@rolekeys) {
                   1936: 				    delete $hash{$key};
                   1937: 				}
                   1938: 				if (untie(%hash)) {
                   1939: 				    print $client "ok\n";
                   1940: 				} else {
                   1941: 				    print $client "error: ".($!+0)
                   1942: 					." untie(GDBM) Failed ".
                   1943: 					"while attempting rolesdel\n";
                   1944: 				}
                   1945: 			    } else {
                   1946: 				print $client "error: ".($!+0)
                   1947: 				    ." tie(GDBM) Failed ".
                   1948: 				    "while attempting rolesdel\n";
                   1949: 			    }
                   1950: 			} else {
                   1951: 			    print $client "refused\n";
                   1952: 			}
                   1953: 		    } else {
                   1954: 			Reply($client, "refused\n", $userinput);
                   1955: 		      
                   1956: 		    }
1.1       albertel 1957: # ------------------------------------------------------------------------- get
1.161     foxr     1958: 		} elsif ($userinput =~ /^get/) {
                   1959: 		    if(isClient) {
                   1960: 			my ($cmd,$udom,$uname,$namespace,$what)
                   1961: 			    =split(/:/,$userinput);
                   1962: 			$namespace=~s/\//\_/g;
                   1963: 			$namespace=~s/\W//g;
                   1964: 			chomp($what);
                   1965: 			my @queries=split(/\&/,$what);
                   1966: 			my $proname=propath($udom,$uname);
                   1967: 			my $qresult='';
                   1968: 			my %hash;
                   1969: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   1970: 			    for (my $i=0;$i<=$#queries;$i++) {
                   1971: 				$qresult.="$hash{$queries[$i]}&";
                   1972: 			    }
                   1973: 			    if (untie(%hash)) {
                   1974: 				$qresult=~s/\&$//;
                   1975: 				print $client "$qresult\n";
                   1976: 			    } else {
                   1977: 				print $client "error: ".($!+0)
                   1978: 				    ." untie(GDBM) Failed ".
                   1979: 				    "while attempting get\n";
                   1980: 			    }
                   1981: 			} else {
                   1982: 			    if ($!+0 == 2) {
                   1983: 				print $client "error:No such file or ".
                   1984: 				    "GDBM reported bad block error\n";
                   1985: 			    } else {
                   1986: 				print $client "error: ".($!+0)
                   1987: 				    ." tie(GDBM) Failed ".
                   1988: 				    "while attempting get\n";
                   1989: 			    }
                   1990: 			}
                   1991: 		    } else {
                   1992: 			Reply($client, "refused\n", $userinput);
                   1993: 		       
                   1994: 		    }
1.1       albertel 1995: # ------------------------------------------------------------------------ eget
1.161     foxr     1996: 		} elsif ($userinput =~ /^eget/) {
                   1997: 		    if (isClient) {
                   1998: 			my ($cmd,$udom,$uname,$namespace,$what)
                   1999: 			    =split(/:/,$userinput);
                   2000: 			$namespace=~s/\//\_/g;
                   2001: 			$namespace=~s/\W//g;
                   2002: 			chomp($what);
                   2003: 			my @queries=split(/\&/,$what);
                   2004: 			my $proname=propath($udom,$uname);
                   2005: 			my $qresult='';
                   2006: 			my %hash;
                   2007: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2008: 			    for (my $i=0;$i<=$#queries;$i++) {
                   2009: 				$qresult.="$hash{$queries[$i]}&";
                   2010: 			    }
                   2011: 			    if (untie(%hash)) {
                   2012: 				$qresult=~s/\&$//;
                   2013: 				if ($cipher) {
                   2014: 				    my $cmdlength=length($qresult);
                   2015: 				    $qresult.="         ";
                   2016: 				    my $encqresult='';
                   2017: 				    for 
                   2018: 					(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
                   2019: 					    $encqresult.=
                   2020: 						unpack("H16",
                   2021: 						       $cipher->encrypt(substr($qresult,$encidx,8)));
                   2022: 					}
                   2023: 				    print $client "enc:$cmdlength:$encqresult\n";
                   2024: 				} else {
                   2025: 				    print $client "error:no_key\n";
                   2026: 				}
                   2027: 			    } else {
                   2028: 				print $client "error: ".($!+0)
                   2029: 				    ." untie(GDBM) Failed ".
                   2030: 				    "while attempting eget\n";
                   2031: 			    }
                   2032: 			} else {
                   2033: 			    print $client "error: ".($!+0)
                   2034: 				." tie(GDBM) Failed ".
                   2035: 				"while attempting eget\n";
                   2036: 			}
                   2037: 		    } else {
                   2038: 			Reply($client, "refused\n", $userinput);
                   2039: 		    
                   2040: 		    }
1.1       albertel 2041: # ------------------------------------------------------------------------- del
1.161     foxr     2042: 		} elsif ($userinput =~ /^del/) {
                   2043: 		    if(isClient) {
                   2044: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2045: 			    =split(/:/,$userinput);
                   2046: 			$namespace=~s/\//\_/g;
                   2047: 			$namespace=~s/\W//g;
                   2048: 			chomp($what);
                   2049: 			my $proname=propath($udom,$uname);
                   2050: 			my $now=time;
                   2051: 			unless ($namespace=~/^nohist\_/) {
                   2052: 			    my $hfh;
                   2053: 			    if (
                   2054: 				$hfh=IO::File->new(">>$proname/$namespace.hist")
                   2055: 				) { print $hfh "D:$now:$what\n"; }
                   2056: 			}
                   2057: 			my @keys=split(/\&/,$what);
                   2058: 			my %hash;
                   2059: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2060: 			    foreach my $key (@keys) {
                   2061: 				delete($hash{$key});
                   2062: 			    }
                   2063: 			    if (untie(%hash)) {
                   2064: 				print $client "ok\n";
                   2065: 			    } else {
                   2066: 				print $client "error: ".($!+0)
                   2067: 				    ." untie(GDBM) Failed ".
                   2068: 				    "while attempting del\n";
                   2069: 			    }
                   2070: 			} else {
                   2071: 			    print $client "error: ".($!+0)
                   2072: 				." tie(GDBM) Failed ".
                   2073: 				"while attempting del\n";
                   2074: 			}
                   2075: 		    } else {
                   2076: 			Reply($client, "refused\n", $userinput);
                   2077: 			
                   2078: 		    }
1.1       albertel 2079: # ------------------------------------------------------------------------ keys
1.161     foxr     2080: 		} elsif ($userinput =~ /^keys/) {
                   2081: 		    if(isClient) {
                   2082: 			my ($cmd,$udom,$uname,$namespace)
                   2083: 			    =split(/:/,$userinput);
                   2084: 			$namespace=~s/\//\_/g;
                   2085: 			$namespace=~s/\W//g;
                   2086: 			my $proname=propath($udom,$uname);
                   2087: 			my $qresult='';
                   2088: 			my %hash;
                   2089: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2090: 			    foreach my $key (keys %hash) {
                   2091: 				$qresult.="$key&";
                   2092: 			    }
                   2093: 			    if (untie(%hash)) {
                   2094: 				$qresult=~s/\&$//;
                   2095: 				print $client "$qresult\n";
                   2096: 			    } else {
                   2097: 				print $client "error: ".($!+0)
                   2098: 				    ." untie(GDBM) Failed ".
                   2099: 				    "while attempting keys\n";
                   2100: 			    }
                   2101: 			} else {
                   2102: 			    print $client "error: ".($!+0)
                   2103: 				." tie(GDBM) Failed ".
                   2104: 				"while attempting keys\n";
                   2105: 			}
                   2106: 		    } else {
                   2107: 			Reply($client, "refused\n", $userinput);
                   2108: 		   
                   2109: 		    }
1.105     matthew  2110: # ----------------------------------------------------------------- dumpcurrent
1.161     foxr     2111: 		} elsif ($userinput =~ /^currentdump/) {
                   2112: 		    if (isClient) {
                   2113: 			my ($cmd,$udom,$uname,$namespace)
                   2114: 			    =split(/:/,$userinput);
                   2115: 			$namespace=~s/\//\_/g;
                   2116: 			$namespace=~s/\W//g;
                   2117: 			my $qresult='';
                   2118: 			my $proname=propath($udom,$uname);
                   2119: 			my %hash;
                   2120: 			if (tie(%hash,'GDBM_File',
                   2121: 				"$proname/$namespace.db",
                   2122: 				&GDBM_READER(),0640)) {
                   2123: 			    # Structure of %data:
                   2124: 			    # $data{$symb}->{$parameter}=$value;
                   2125: 			    # $data{$symb}->{'v.'.$parameter}=$version;
                   2126: 			    # since $parameter will be unescaped, we do not
                   2127: 			    # have to worry about silly parameter names...
                   2128: 			    my %data = ();
                   2129: 			    while (my ($key,$value) = each(%hash)) {
                   2130: 				my ($v,$symb,$param) = split(/:/,$key);
                   2131: 				next if ($v eq 'version' || $symb eq 'keys');
                   2132: 				next if (exists($data{$symb}) && 
                   2133: 					 exists($data{$symb}->{$param}) &&
                   2134: 					 $data{$symb}->{'v.'.$param} > $v);
                   2135: 				$data{$symb}->{$param}=$value;
                   2136: 				$data{$symb}->{'v.'.$param}=$v;
                   2137: 			    }
                   2138: 			    if (untie(%hash)) {
                   2139: 				while (my ($symb,$param_hash) = each(%data)) {
                   2140: 				    while(my ($param,$value) = each (%$param_hash)){
                   2141: 					next if ($param =~ /^v\./);
                   2142: 					$qresult.=$symb.':'.$param.'='.$value.'&';
                   2143: 				    }
                   2144: 				}
                   2145: 				chop($qresult);
                   2146: 				print $client "$qresult\n";
                   2147: 			    } else {
                   2148: 				print $client "error: ".($!+0)
                   2149: 				    ." untie(GDBM) Failed ".
                   2150: 				    "while attempting currentdump\n";
                   2151: 			    }
                   2152: 			} else {
                   2153: 			    print $client "error: ".($!+0)
                   2154: 				." tie(GDBM) Failed ".
                   2155: 				"while attempting currentdump\n";
                   2156: 			}
                   2157: 		    } else {
                   2158: 			Reply($client, "refused\n", $userinput);
                   2159: 		    }
1.1       albertel 2160: # ------------------------------------------------------------------------ dump
1.161     foxr     2161: 		} elsif ($userinput =~ /^dump/) {
                   2162: 		    if(isClient) {
                   2163: 			my ($cmd,$udom,$uname,$namespace,$regexp)
                   2164: 			    =split(/:/,$userinput);
                   2165: 			$namespace=~s/\//\_/g;
                   2166: 			$namespace=~s/\W//g;
                   2167: 			if (defined($regexp)) {
                   2168: 			    $regexp=&unescape($regexp);
                   2169: 			} else {
                   2170: 			    $regexp='.';
                   2171: 			}
                   2172: 			my $qresult='';
                   2173: 			my $proname=propath($udom,$uname);
                   2174: 			my %hash;
                   2175: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2176: 			       study($regexp);
                   2177: 			       while (my ($key,$value) = each(%hash)) {
                   2178: 				   if ($regexp eq '.') {
                   2179: 				       $qresult.=$key.'='.$value.'&';
                   2180: 				   } else {
                   2181: 				       my $unescapeKey = &unescape($key);
                   2182: 				       if (eval('$unescapeKey=~/$regexp/')) {
                   2183: 					   $qresult.="$key=$value&";
                   2184: 				       }
                   2185: 				   }
                   2186: 			       }
                   2187: 			       if (untie(%hash)) {
                   2188: 				   chop($qresult);
                   2189: 				   print $client "$qresult\n";
                   2190: 			       } else {
                   2191: 				   print $client "error: ".($!+0)
                   2192: 				       ." untie(GDBM) Failed ".
1.111     matthew  2193:                                        "while attempting dump\n";
1.161     foxr     2194: 			       }
                   2195: 			   } else {
                   2196: 			       print $client "error: ".($!+0)
                   2197: 				   ." tie(GDBM) Failed ".
                   2198: 				   "while attempting dump\n";
                   2199: 			   }
                   2200: 		    } else {
                   2201: 			Reply($client, "refused\n", $userinput);
                   2202: 		 
                   2203: 		    }
1.7       www      2204: # ----------------------------------------------------------------------- store
1.161     foxr     2205: 		} elsif ($userinput =~ /^store/) {
                   2206: 		    if(isClient) {
                   2207: 			my ($cmd,$udom,$uname,$namespace,$rid,$what)
                   2208: 			    =split(/:/,$userinput);
                   2209: 			$namespace=~s/\//\_/g;
                   2210: 			$namespace=~s/\W//g;
                   2211: 			if ($namespace ne 'roles') {
                   2212: 			    chomp($what);
                   2213: 			    my $proname=propath($udom,$uname);
                   2214: 			    my $now=time;
                   2215: 			    unless ($namespace=~/^nohist\_/) {
                   2216: 				my $hfh;
                   2217: 				if (
                   2218: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2219: 				    ) { print $hfh "P:$now:$rid:$what\n"; }
                   2220: 			    }
                   2221: 			    my @pairs=split(/\&/,$what);
                   2222: 			    my %hash;
                   2223: 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2224: 				my @previouskeys=split(/&/,$hash{"keys:$rid"});
                   2225: 				my $key;
                   2226: 				$hash{"version:$rid"}++;
                   2227: 				my $version=$hash{"version:$rid"};
                   2228: 				my $allkeys=''; 
                   2229: 				foreach my $pair (@pairs) {
                   2230: 				    my ($key,$value)=split(/=/,$pair);
                   2231: 				    $allkeys.=$key.':';
                   2232: 				    $hash{"$version:$rid:$key"}=$value;
                   2233: 				}
                   2234: 				$hash{"$version:$rid:timestamp"}=$now;
                   2235: 				$allkeys.='timestamp';
                   2236: 				$hash{"$version:keys:$rid"}=$allkeys;
                   2237: 				if (untie(%hash)) {
                   2238: 				    print $client "ok\n";
                   2239: 				} else {
                   2240: 				    print $client "error: ".($!+0)
                   2241: 					." untie(GDBM) Failed ".
                   2242: 					"while attempting store\n";
                   2243: 				}
                   2244: 			    } else {
                   2245: 				print $client "error: ".($!+0)
                   2246: 				    ." tie(GDBM) Failed ".
                   2247: 				    "while attempting store\n";
                   2248: 			    }
                   2249: 			} else {
                   2250: 			    print $client "refused\n";
                   2251: 			}
                   2252: 		    } else {
                   2253: 			Reply($client, "refused\n", $userinput);
                   2254: 		     
                   2255: 		    }
1.7       www      2256: # --------------------------------------------------------------------- restore
1.161     foxr     2257: 		} elsif ($userinput =~ /^restore/) {
                   2258: 		    if(isClient) {
                   2259: 			my ($cmd,$udom,$uname,$namespace,$rid)
                   2260: 			    =split(/:/,$userinput);
                   2261: 			$namespace=~s/\//\_/g;
                   2262: 			$namespace=~s/\W//g;
                   2263: 			chomp($rid);
                   2264: 			my $proname=propath($udom,$uname);
                   2265: 			my $qresult='';
                   2266: 			my %hash;
                   2267: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2268: 			    my $version=$hash{"version:$rid"};
                   2269: 			    $qresult.="version=$version&";
                   2270: 			    my $scope;
                   2271: 			    for ($scope=1;$scope<=$version;$scope++) {
                   2272: 				my $vkeys=$hash{"$scope:keys:$rid"};
                   2273: 				my @keys=split(/:/,$vkeys);
                   2274: 				my $key;
                   2275: 				$qresult.="$scope:keys=$vkeys&";
                   2276: 				foreach $key (@keys) {
                   2277: 				    $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
                   2278: 				}                                  
                   2279: 			    }
                   2280: 			    if (untie(%hash)) {
                   2281: 				$qresult=~s/\&$//;
                   2282: 				print $client "$qresult\n";
                   2283: 			    } else {
                   2284: 				print $client "error: ".($!+0)
                   2285: 				    ." untie(GDBM) Failed ".
                   2286: 				    "while attempting restore\n";
                   2287: 			    }
                   2288: 			} else {
                   2289: 			    print $client "error: ".($!+0)
                   2290: 				." tie(GDBM) Failed ".
                   2291: 				"while attempting restore\n";
                   2292: 			}
                   2293: 		    } else  {
                   2294: 			Reply($client, "refused\n", $userinput);
                   2295: 		       
                   2296: 		    }
1.86      www      2297: # -------------------------------------------------------------------- chatsend
1.161     foxr     2298: 		} elsif ($userinput =~ /^chatsend/) {
                   2299: 		    if(isClient) {
                   2300: 			my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
                   2301: 			&chatadd($cdom,$cnum,$newpost);
                   2302: 			print $client "ok\n";
                   2303: 		    } else {
                   2304: 			Reply($client, "refused\n", $userinput);
                   2305: 		      
                   2306: 		    }
1.86      www      2307: # -------------------------------------------------------------------- chatretr
1.161     foxr     2308: 		} elsif ($userinput =~ /^chatretr/) {
                   2309: 		    if(isClient) {
                   2310: 			my 
                   2311: 			    ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
                   2312: 			my $reply='';
                   2313: 			foreach (&getchat($cdom,$cnum,$udom,$uname)) {
                   2314: 			    $reply.=&escape($_).':';
                   2315: 			}
                   2316: 			$reply=~s/\:$//;
                   2317: 			print $client $reply."\n";
                   2318: 		    } else {
                   2319: 			Reply($client, "refused\n", $userinput);
                   2320: 		       
                   2321: 		    }
1.12      harris41 2322: # ------------------------------------------------------------------- querysend
1.161     foxr     2323: 		} elsif ($userinput =~ /^querysend/) {
                   2324: 		    if(isClient) {
                   2325: 			my ($cmd,$query,
                   2326: 			    $arg1,$arg2,$arg3)=split(/\:/,$userinput);
                   2327: 			$query=~s/\n*$//g;
                   2328: 			print $client "".
                   2329: 			    sqlreply("$clientname\&$query".
                   2330: 				     "\&$arg1"."\&$arg2"."\&$arg3")."\n";
                   2331: 		    } else {
                   2332: 			Reply($client, "refused\n", $userinput);
                   2333: 		      
                   2334: 		    }
1.12      harris41 2335: # ------------------------------------------------------------------ queryreply
1.161     foxr     2336: 		} elsif ($userinput =~ /^queryreply/) {
                   2337: 		    if(isClient) {
                   2338: 			my ($cmd,$id,$reply)=split(/:/,$userinput); 
                   2339: 			my $store;
                   2340: 			my $execdir=$perlvar{'lonDaemons'};
                   2341: 			if ($store=IO::File->new(">$execdir/tmp/$id")) {
                   2342: 			    $reply=~s/\&/\n/g;
                   2343: 			    print $store $reply;
                   2344: 			    close $store;
                   2345: 			    my $store2=IO::File->new(">$execdir/tmp/$id.end");
                   2346: 			    print $store2 "done\n";
                   2347: 			    close $store2;
                   2348: 			    print $client "ok\n";
                   2349: 			}
                   2350: 			else {
                   2351: 			    print $client "error: ".($!+0)
                   2352: 				." IO::File->new Failed ".
                   2353: 				"while attempting queryreply\n";
                   2354: 			}
                   2355: 		    } else {
                   2356: 			Reply($client, "refused\n", $userinput);
                   2357: 		     
                   2358: 		    }
1.118     www      2359: # ----------------------------------------------------------------- courseidput
1.161     foxr     2360: 		} elsif ($userinput =~ /^courseidput/) {
                   2361: 		    if(isClient) {
                   2362: 			my ($cmd,$udom,$what)=split(/:/,$userinput);
                   2363: 			chomp($what);
                   2364: 			$udom=~s/\W//g;
                   2365: 			my $proname=
                   2366: 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
                   2367: 			my $now=time;
                   2368: 			my @pairs=split(/\&/,$what);
                   2369: 			my %hash;
                   2370: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
                   2371: 			    foreach my $pair (@pairs) {
                   2372: 				my ($key,$value)=split(/=/,$pair);
                   2373: 				$hash{$key}=$value.':'.$now;
                   2374: 			    }
                   2375: 			    if (untie(%hash)) {
                   2376: 				print $client "ok\n";
                   2377: 			    } else {
                   2378: 				print $client "error: ".($!+0)
                   2379: 				    ." untie(GDBM) Failed ".
                   2380: 				    "while attempting courseidput\n";
                   2381: 			    }
                   2382: 			} else {
                   2383: 			    print $client "error: ".($!+0)
                   2384: 				." tie(GDBM) Failed ".
                   2385: 				"while attempting courseidput\n";
                   2386: 			}
                   2387: 		    } else {
                   2388: 			Reply($client, "refused\n", $userinput);
                   2389: 		       
                   2390: 		    }
1.118     www      2391: # ---------------------------------------------------------------- courseiddump
1.161     foxr     2392: 		} elsif ($userinput =~ /^courseiddump/) {
                   2393: 		    if(isClient) {
                   2394: 			my ($cmd,$udom,$since,$description)
                   2395: 			    =split(/:/,$userinput);
                   2396: 			if (defined($description)) {
                   2397: 			    $description=&unescape($description);
                   2398: 			} else {
                   2399: 			    $description='.';
                   2400: 			}
                   2401: 			unless (defined($since)) { $since=0; }
                   2402: 			my $qresult='';
                   2403: 			my $proname=
                   2404: 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
                   2405: 			my %hash;
                   2406: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
                   2407: 			    while (my ($key,$value) = each(%hash)) {
                   2408: 				my ($descr,$lasttime)=split(/\:/,$value);
                   2409: 				if ($lasttime<$since) { next; }
                   2410: 				if ($description eq '.') {
                   2411: 				    $qresult.=$key.'='.$descr.'&';
                   2412: 				} else {
                   2413: 				    my $unescapeVal = &unescape($descr);
                   2414: 				    if (eval('$unescapeVal=~/$description/i')) {
                   2415: 					$qresult.="$key=$descr&";
                   2416: 				    }
                   2417: 				}
                   2418: 			    }
                   2419: 			    if (untie(%hash)) {
                   2420: 				chop($qresult);
                   2421: 				print $client "$qresult\n";
                   2422: 			    } else {
                   2423: 				print $client "error: ".($!+0)
                   2424: 				    ." untie(GDBM) Failed ".
                   2425: 				    "while attempting courseiddump\n";
                   2426: 			    }
                   2427: 			} else {
                   2428: 			    print $client "error: ".($!+0)
                   2429: 				." tie(GDBM) Failed ".
                   2430: 				"while attempting courseiddump\n";
                   2431: 			}
                   2432: 		    } else {
                   2433: 			Reply($client, "refused\n", $userinput);
                   2434: 		       
                   2435: 		    }
1.1       albertel 2436: # ----------------------------------------------------------------------- idput
1.161     foxr     2437: 		} elsif ($userinput =~ /^idput/) {
                   2438: 		    if(isClient) {
                   2439: 			my ($cmd,$udom,$what)=split(/:/,$userinput);
                   2440: 			chomp($what);
                   2441: 			$udom=~s/\W//g;
                   2442: 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
                   2443: 			my $now=time;
                   2444: 			{
                   2445: 			    my $hfh;
                   2446: 			    if (
                   2447: 				$hfh=IO::File->new(">>$proname.hist")
                   2448: 				) { print $hfh "P:$now:$what\n"; }
                   2449: 			}
                   2450: 			my @pairs=split(/\&/,$what);
                   2451: 			my %hash;
                   2452: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
                   2453: 			    foreach my $pair (@pairs) {
                   2454: 				my ($key,$value)=split(/=/,$pair);
                   2455: 				$hash{$key}=$value;
                   2456: 			    }
                   2457: 			    if (untie(%hash)) {
                   2458: 				print $client "ok\n";
                   2459: 			    } else {
                   2460: 				print $client "error: ".($!+0)
                   2461: 				    ." untie(GDBM) Failed ".
                   2462: 				    "while attempting idput\n";
                   2463: 			    }
                   2464: 			} else {
                   2465: 			    print $client "error: ".($!+0)
                   2466: 				." tie(GDBM) Failed ".
                   2467: 				"while attempting idput\n";
                   2468: 			}
                   2469: 		    } else {
                   2470: 			Reply($client, "refused\n", $userinput);
                   2471: 		       
                   2472: 		    }
1.1       albertel 2473: # ----------------------------------------------------------------------- idget
1.161     foxr     2474: 		} elsif ($userinput =~ /^idget/) {
                   2475: 		    if(isClient) {
                   2476: 			my ($cmd,$udom,$what)=split(/:/,$userinput);
                   2477: 			chomp($what);
                   2478: 			$udom=~s/\W//g;
                   2479: 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
                   2480: 			my @queries=split(/\&/,$what);
                   2481: 			my $qresult='';
                   2482: 			my %hash;
                   2483: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
                   2484: 			    for (my $i=0;$i<=$#queries;$i++) {
                   2485: 				$qresult.="$hash{$queries[$i]}&";
                   2486: 			    }
                   2487: 			    if (untie(%hash)) {
                   2488: 				$qresult=~s/\&$//;
                   2489: 				print $client "$qresult\n";
                   2490: 			    } else {
                   2491: 				print $client "error: ".($!+0)
                   2492: 				    ." untie(GDBM) Failed ".
                   2493: 				    "while attempting idget\n";
                   2494: 			    }
                   2495: 			} else {
                   2496: 			    print $client "error: ".($!+0)
                   2497: 				." tie(GDBM) Failed ".
                   2498: 				"while attempting idget\n";
                   2499: 			}
                   2500: 		    } else {
                   2501: 			Reply($client, "refused\n", $userinput);
                   2502: 		       
                   2503: 		    }
1.13      www      2504: # ---------------------------------------------------------------------- tmpput
1.161     foxr     2505: 		} elsif ($userinput =~ /^tmpput/) {
                   2506: 		    if(isClient) {
                   2507: 			my ($cmd,$what)=split(/:/,$userinput);
                   2508: 			my $store;
                   2509: 			$tmpsnum++;
                   2510: 			my $id=$$.'_'.$clientip.'_'.$tmpsnum;
                   2511: 			$id=~s/\W/\_/g;
                   2512: 			$what=~s/\n//g;
                   2513: 			my $execdir=$perlvar{'lonDaemons'};
                   2514: 			if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
                   2515: 			    print $store $what;
                   2516: 			    close $store;
                   2517: 			    print $client "$id\n";
                   2518: 			}
                   2519: 			else {
                   2520: 			    print $client "error: ".($!+0)
                   2521: 				."IO::File->new Failed ".
                   2522: 				"while attempting tmpput\n";
                   2523: 			}
                   2524: 		    } else {
                   2525: 			Reply($client, "refused\n", $userinput);
                   2526: 		    
                   2527: 		    }
                   2528: 		    
1.13      www      2529: # ---------------------------------------------------------------------- tmpget
1.161     foxr     2530: 		} elsif ($userinput =~ /^tmpget/) {
                   2531: 		    if(isClient) {
                   2532: 			my ($cmd,$id)=split(/:/,$userinput);
                   2533: 			chomp($id);
                   2534: 			$id=~s/\W/\_/g;
                   2535: 			my $store;
                   2536: 			my $execdir=$perlvar{'lonDaemons'};
                   2537: 			if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
                   2538: 			    my $reply=<$store>;
                   2539: 			    print $client "$reply\n";
                   2540: 			    close $store;
                   2541: 			}
                   2542: 			else {
                   2543: 			    print $client "error: ".($!+0)
                   2544: 				."IO::File->new Failed ".
                   2545: 				"while attempting tmpget\n";
                   2546: 			}
                   2547: 		    } else {
                   2548: 			Reply($client, "refused\n", $userinput);
                   2549: 		      
                   2550: 		    }
1.110     www      2551: # ---------------------------------------------------------------------- tmpdel
1.161     foxr     2552: 		} elsif ($userinput =~ /^tmpdel/) {
                   2553: 		    if(isClient) {
                   2554: 			my ($cmd,$id)=split(/:/,$userinput);
                   2555: 			chomp($id);
                   2556: 			$id=~s/\W/\_/g;
                   2557: 			my $execdir=$perlvar{'lonDaemons'};
                   2558: 			if (unlink("$execdir/tmp/$id.tmp")) {
                   2559: 			    print $client "ok\n";
                   2560: 			} else {
                   2561: 			    print $client "error: ".($!+0)
                   2562: 				."Unlink tmp Failed ".
                   2563: 				"while attempting tmpdel\n";
                   2564: 			}
                   2565: 		    } else {
                   2566: 			Reply($client, "refused\n", $userinput);
                   2567: 		     
                   2568: 		    }
1.5       www      2569: # -------------------------------------------------------------------------- ls
1.161     foxr     2570: 		} elsif ($userinput =~ /^ls/) {
                   2571: 		    if(isClient) {
                   2572: 			my ($cmd,$ulsdir)=split(/:/,$userinput);
                   2573: 			my $ulsout='';
                   2574: 			my $ulsfn;
                   2575: 			if (-e $ulsdir) {
                   2576: 			    if(-d $ulsdir) {
                   2577: 				if (opendir(LSDIR,$ulsdir)) {
                   2578: 				    while ($ulsfn=readdir(LSDIR)) {
                   2579: 					my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   2580: 					$ulsout.=$ulsfn.'&'.
                   2581: 					    join('&',@ulsstats).':';
                   2582: 				    }
                   2583: 				    closedir(LSDIR);
                   2584: 				}
                   2585: 			    } else {
                   2586: 				my @ulsstats=stat($ulsdir);
                   2587: 				$ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   2588: 			    }
                   2589: 			} else {
                   2590: 			    $ulsout='no_such_dir';
                   2591: 			}
                   2592: 			if ($ulsout eq '') { $ulsout='empty'; }
                   2593: 			print $client "$ulsout\n";
                   2594: 		    } else {
                   2595: 			Reply($client, "refused\n", $userinput);
                   2596: 		     
                   2597: 		    }
1.136     www      2598: # ----------------------------------------------------------------- setannounce
1.161     foxr     2599: 		} elsif ($userinput =~ /^setannounce/) {
                   2600: 		    if (isClient) {
                   2601: 			my ($cmd,$announcement)=split(/:/,$userinput);
                   2602: 			chomp($announcement);
                   2603: 			$announcement=&unescape($announcement);
                   2604: 			if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
                   2605: 						    '/announcement.txt')) {
                   2606: 			    print $store $announcement;
                   2607: 			    close $store;
                   2608: 			    print $client "ok\n";
                   2609: 			} else {
                   2610: 			    print $client "error: ".($!+0)."\n";
                   2611: 			}
                   2612: 		    } else {
                   2613: 			Reply($client, "refused\n", $userinput);
                   2614: 		       
                   2615: 		    }
1.51      www      2616: # ------------------------------------------------------------------ Hanging up
1.161     foxr     2617: 		} elsif (($userinput =~ /^exit/) ||
                   2618: 			 ($userinput =~ /^init/)) { # no restrictions.
                   2619: 		    &logthis(
                   2620: 			     "Client $clientip ($clientname) hanging up: $userinput");
                   2621: 		    print $client "bye\n";
1.164     foxr     2622: 		    $client->shutdown(2);        # shutdown the socket forcibly.
1.161     foxr     2623: 		    $client->close();
                   2624: 		    last;
                   2625: 
                   2626: # ---------------------------------- set current host/domain
                   2627: 		} elsif ($userinput =~ /^sethost:/) {
                   2628: 		    if (isClient) {
                   2629: 			print $client &sethost($userinput)."\n";
                   2630: 		    } else {
                   2631: 			print $client "refused\n";
                   2632: 		    }
                   2633: #---------------------------------- request file (?) version.
                   2634: 		} elsif ($userinput =~/^version:/) {
                   2635: 		    if (isClient) {
                   2636: 			print $client &version($userinput)."\n";
                   2637: 		    } else {
                   2638: 			print $client "refused\n";
                   2639: 		    }
1.1       albertel 2640: # ------------------------------------------------------------- unknown command
1.161     foxr     2641: 
                   2642: 		} else {
                   2643: 		    # unknown command
                   2644: 		    print $client "unknown_cmd\n";
                   2645: 		}
1.58      www      2646: # -------------------------------------------------------------------- complete
1.161     foxr     2647: 		alarm(0);
                   2648: 		&status('Listening to '.$clientname);
                   2649: 	    }
1.59      www      2650: # --------------------------------------------- client unknown or fishy, refuse
1.161     foxr     2651: 	} else {
                   2652: 	    print $client "refused\n";
                   2653: 	    $client->close();
                   2654: 	    &logthis("<font color=blue>WARNING: "
                   2655: 		     ."Rejected client $clientip, closing connection</font>");
                   2656: 	}
                   2657:     }             
                   2658:     
1.1       albertel 2659: # =============================================================================
1.161     foxr     2660:     
                   2661:     &logthis("<font color=red>CRITICAL: "
                   2662: 	     ."Disconnect from $clientip ($clientname)</font>");    
                   2663:     
                   2664:     
                   2665:     # this exit is VERY important, otherwise the child will become
                   2666:     # a producer of more and more children, forking yourself into
                   2667:     # process death.
                   2668:     exit;
1.106     foxr     2669:     
1.78      foxr     2670: }
                   2671: 
                   2672: 
                   2673: #
                   2674: #   Checks to see if the input roleput request was to set
                   2675: # an author role.  If so, invokes the lchtmldir script to set
                   2676: # up a correct public_html 
                   2677: # Parameters:
                   2678: #    request   - The request sent to the rolesput subchunk.
                   2679: #                We're looking for  /domain/_au
                   2680: #    domain    - The domain in which the user is having roles doctored.
                   2681: #    user      - Name of the user for which the role is being put.
                   2682: #    authtype  - The authentication type associated with the user.
                   2683: #
                   2684: sub ManagePermissions
                   2685: {
                   2686:     my $request = shift;
                   2687:     my $domain  = shift;
                   2688:     my $user    = shift;
                   2689:     my $authtype= shift;
                   2690: 
                   2691:     # See if the request is of the form /$domain/_au
1.134     albertel 2692:     &logthis("ruequest is $request");
1.78      foxr     2693:     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
                   2694: 	my $execdir = $perlvar{'lonDaemons'};
                   2695: 	my $userhome= "/home/$user" ;
1.134     albertel 2696: 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.78      foxr     2697: 	system("$execdir/lchtmldir $userhome $user $authtype");
                   2698:     }
                   2699: }
                   2700: #
                   2701: #   GetAuthType - Determines the authorization type of a user in a domain.
                   2702: 
                   2703: #     Returns the authorization type or nouser if there is no such user.
                   2704: #
                   2705: sub GetAuthType 
                   2706: {
                   2707:     my $domain = shift;
                   2708:     my $user   = shift;
                   2709: 
1.79      foxr     2710:     Debug("GetAuthType( $domain, $user ) \n");
1.78      foxr     2711:     my $proname    = &propath($domain, $user); 
                   2712:     my $passwdfile = "$proname/passwd";
                   2713:     if( -e $passwdfile ) {
                   2714: 	my $pf = IO::File->new($passwdfile);
                   2715: 	my $realpassword = <$pf>;
                   2716: 	chomp($realpassword);
1.79      foxr     2717: 	Debug("Password info = $realpassword\n");
1.78      foxr     2718: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79      foxr     2719: 	Debug("Authtype = $authtype, content = $contentpwd\n");
1.78      foxr     2720: 	my $availinfo = '';
1.91      albertel 2721: 	if($authtype eq 'krb4' or $authtype eq 'krb5') {
1.78      foxr     2722: 	    $availinfo = $contentpwd;
                   2723: 	}
1.79      foxr     2724: 
1.78      foxr     2725: 	return "$authtype:$availinfo";
                   2726:     }
                   2727:     else {
1.79      foxr     2728: 	Debug("Returning nouser");
1.78      foxr     2729: 	return "nouser";
                   2730:     }
1.1       albertel 2731: }
                   2732: 
1.84      albertel 2733: sub addline {
                   2734:     my ($fname,$hostid,$ip,$newline)=@_;
                   2735:     my $contents;
                   2736:     my $found=0;
                   2737:     my $expr='^'.$hostid.':'.$ip.':';
                   2738:     $expr =~ s/\./\\\./g;
1.134     albertel 2739:     my $sh;
1.84      albertel 2740:     if ($sh=IO::File->new("$fname.subscription")) {
                   2741: 	while (my $subline=<$sh>) {
                   2742: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
                   2743: 	}
                   2744: 	$sh->close();
                   2745:     }
                   2746:     $sh=IO::File->new(">$fname.subscription");
                   2747:     if ($contents) { print $sh $contents; }
                   2748:     if ($newline) { print $sh $newline; }
                   2749:     $sh->close();
                   2750:     return $found;
1.86      www      2751: }
                   2752: 
                   2753: sub getchat {
1.122     www      2754:     my ($cdom,$cname,$udom,$uname)=@_;
1.87      www      2755:     my %hash;
                   2756:     my $proname=&propath($cdom,$cname);
                   2757:     my @entries=();
1.88      albertel 2758:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   2759: 	    &GDBM_READER(),0640)) {
                   2760: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   2761: 	untie %hash;
1.123     www      2762:     }
1.124     www      2763:     my @participants=();
1.134     albertel 2764:     my $cutoff=time-60;
1.123     www      2765:     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
1.124     www      2766: 	    &GDBM_WRCREAT(),0640)) {
                   2767:         $hash{$uname.':'.$udom}=time;
1.123     www      2768:         foreach (sort keys %hash) {
                   2769: 	    if ($hash{$_}>$cutoff) {
1.124     www      2770: 		$participants[$#participants+1]='active_participant:'.$_;
1.123     www      2771:             }
                   2772:         }
                   2773:         untie %hash;
1.86      www      2774:     }
1.124     www      2775:     return (@participants,@entries);
1.86      www      2776: }
                   2777: 
                   2778: sub chatadd {
1.88      albertel 2779:     my ($cdom,$cname,$newchat)=@_;
                   2780:     my %hash;
                   2781:     my $proname=&propath($cdom,$cname);
                   2782:     my @entries=();
1.142     www      2783:     my $time=time;
1.88      albertel 2784:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   2785: 	    &GDBM_WRCREAT(),0640)) {
                   2786: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   2787: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
                   2788: 	my ($thentime,$idnum)=split(/\_/,$lastid);
                   2789: 	my $newid=$time.'_000000';
                   2790: 	if ($thentime==$time) {
                   2791: 	    $idnum=~s/^0+//;
                   2792: 	    $idnum++;
                   2793: 	    $idnum=substr('000000'.$idnum,-6,6);
                   2794: 	    $newid=$time.'_'.$idnum;
                   2795: 	}
                   2796: 	$hash{$newid}=$newchat;
                   2797: 	my $expired=$time-3600;
                   2798: 	foreach (keys %hash) {
                   2799: 	    my ($thistime)=($_=~/(\d+)\_/);
                   2800: 	    if ($thistime<$expired) {
1.89      www      2801: 		delete $hash{$_};
1.88      albertel 2802: 	    }
                   2803: 	}
                   2804: 	untie %hash;
1.142     www      2805:     }
                   2806:     {
                   2807: 	my $hfh;
                   2808: 	if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 
                   2809: 	    print $hfh "$time:".&unescape($newchat)."\n";
                   2810: 	}
1.86      www      2811:     }
1.84      albertel 2812: }
                   2813: 
                   2814: sub unsub {
                   2815:     my ($fname,$clientip)=@_;
                   2816:     my $result;
1.161     foxr     2817:     if (unlink("$fname.$clientname")) {
1.84      albertel 2818: 	$result="ok\n";
                   2819:     } else {
                   2820: 	$result="not_subscribed\n";
                   2821:     }
                   2822:     if (-e "$fname.subscription") {
1.161     foxr     2823: 	my $found=&addline($fname,$clientname,$clientip,'');
1.84      albertel 2824: 	if ($found) { $result="ok\n"; }
                   2825:     } else {
                   2826: 	if ($result != "ok\n") { $result="not_subscribed\n"; }
                   2827:     }
                   2828:     return $result;
                   2829: }
                   2830: 
1.101     www      2831: sub currentversion {
                   2832:     my $fname=shift;
                   2833:     my $version=-1;
                   2834:     my $ulsdir='';
                   2835:     if ($fname=~/^(.+)\/[^\/]+$/) {
                   2836:        $ulsdir=$1;
                   2837:     }
1.114     albertel 2838:     my ($fnamere1,$fnamere2);
                   2839:     # remove version if already specified
1.101     www      2840:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114     albertel 2841:     # get the bits that go before and after the version number
                   2842:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
                   2843: 	$fnamere1=$1;
                   2844: 	$fnamere2='.'.$2;
                   2845:     }
1.101     www      2846:     if (-e $fname) { $version=1; }
                   2847:     if (-e $ulsdir) {
1.134     albertel 2848: 	if(-d $ulsdir) {
                   2849: 	    if (opendir(LSDIR,$ulsdir)) {
                   2850: 		my $ulsfn;
                   2851: 		while ($ulsfn=readdir(LSDIR)) {
1.101     www      2852: # see if this is a regular file (ignore links produced earlier)
1.134     albertel 2853: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
                   2854: 		    unless (-l $thisfile) {
1.160     www      2855: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134     albertel 2856: 			    if ($1>$version) { $version=$1; }
                   2857: 			}
                   2858: 		    }
                   2859: 		}
                   2860: 		closedir(LSDIR);
                   2861: 		$version++;
                   2862: 	    }
                   2863: 	}
                   2864:     }
                   2865:     return $version;
1.101     www      2866: }
                   2867: 
                   2868: sub thisversion {
                   2869:     my $fname=shift;
                   2870:     my $version=-1;
                   2871:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
                   2872: 	$version=$1;
                   2873:     }
                   2874:     return $version;
                   2875: }
                   2876: 
1.84      albertel 2877: sub subscribe {
                   2878:     my ($userinput,$clientip)=@_;
                   2879:     my $result;
                   2880:     my ($cmd,$fname)=split(/:/,$userinput);
                   2881:     my $ownership=&ishome($fname);
                   2882:     if ($ownership eq 'owner') {
1.101     www      2883: # explitly asking for the current version?
                   2884:         unless (-e $fname) {
                   2885:             my $currentversion=&currentversion($fname);
                   2886: 	    if (&thisversion($fname)==$currentversion) {
                   2887:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
                   2888: 		    my $root=$1;
                   2889:                     my $extension=$2;
                   2890:                     symlink($root.'.'.$extension,
                   2891:                             $root.'.'.$currentversion.'.'.$extension);
1.102     www      2892:                     unless ($extension=~/\.meta$/) {
                   2893:                        symlink($root.'.'.$extension.'.meta',
                   2894:                             $root.'.'.$currentversion.'.'.$extension.'.meta');
                   2895: 		    }
1.101     www      2896:                 }
                   2897:             }
                   2898:         }
1.84      albertel 2899: 	if (-e $fname) {
                   2900: 	    if (-d $fname) {
                   2901: 		$result="directory\n";
                   2902: 	    } else {
1.161     foxr     2903: 		if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134     albertel 2904: 		my $now=time;
1.161     foxr     2905: 		my $found=&addline($fname,$clientname,$clientip,
                   2906: 				   "$clientname:$clientip:$now\n");
1.84      albertel 2907: 		if ($found) { $result="$fname\n"; }
                   2908: 		# if they were subscribed to only meta data, delete that
                   2909:                 # subscription, when you subscribe to a file you also get
                   2910:                 # the metadata
                   2911: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
                   2912: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
                   2913: 		$fname="http://$thisserver/".$fname;
                   2914: 		$result="$fname\n";
                   2915: 	    }
                   2916: 	} else {
                   2917: 	    $result="not_found\n";
                   2918: 	}
                   2919:     } else {
                   2920: 	$result="rejected\n";
                   2921:     }
                   2922:     return $result;
                   2923: }
1.91      albertel 2924: 
                   2925: sub make_passwd_file {
1.98      foxr     2926:     my ($uname, $umode,$npass,$passfilename)=@_;
1.91      albertel 2927:     my $result="ok\n";
                   2928:     if ($umode eq 'krb4' or $umode eq 'krb5') {
                   2929: 	{
                   2930: 	    my $pf = IO::File->new(">$passfilename");
                   2931: 	    print $pf "$umode:$npass\n";
                   2932: 	}
                   2933:     } elsif ($umode eq 'internal') {
                   2934: 	my $salt=time;
                   2935: 	$salt=substr($salt,6,2);
                   2936: 	my $ncpass=crypt($npass,$salt);
                   2937: 	{
                   2938: 	    &Debug("Creating internal auth");
                   2939: 	    my $pf = IO::File->new(">$passfilename");
                   2940: 	    print $pf "internal:$ncpass\n"; 
                   2941: 	}
                   2942:     } elsif ($umode eq 'localauth') {
                   2943: 	{
                   2944: 	    my $pf = IO::File->new(">$passfilename");
                   2945: 	    print $pf "localauth:$npass\n";
                   2946: 	}
                   2947:     } elsif ($umode eq 'unix') {
                   2948: 	{
                   2949: 	    my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
                   2950: 	    {
                   2951: 		&Debug("Executing external: ".$execpath);
1.98      foxr     2952: 		&Debug("user  = ".$uname.", Password =". $npass);
1.132     matthew  2953: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91      albertel 2954: 		print $se "$uname\n";
                   2955: 		print $se "$npass\n";
                   2956: 		print $se "$npass\n";
1.97      foxr     2957: 	    }
                   2958: 	    my $useraddok = $?;
                   2959: 	    if($useraddok > 0) {
                   2960: 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
1.91      albertel 2961: 	    }
                   2962: 	    my $pf = IO::File->new(">$passfilename");
                   2963: 	    print $pf "unix:\n";
                   2964: 	}
                   2965:     } elsif ($umode eq 'none') {
                   2966: 	{
                   2967: 	    my $pf = IO::File->new(">$passfilename");
                   2968: 	    print $pf "none:\n";
                   2969: 	}
                   2970:     } else {
                   2971: 	$result="auth_mode_error\n";
                   2972:     }
                   2973:     return $result;
1.121     albertel 2974: }
                   2975: 
                   2976: sub sethost {
                   2977:     my ($remotereq) = @_;
                   2978:     my (undef,$hostid)=split(/:/,$remotereq);
                   2979:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
                   2980:     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
                   2981: 	$currenthostid=$hostid;
                   2982: 	$currentdomainid=$hostdom{$hostid};
                   2983: 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
                   2984:     } else {
                   2985: 	&logthis("Requested host id $hostid not an alias of ".
                   2986: 		 $perlvar{'lonHostID'}." refusing connection");
                   2987: 	return 'unable_to_set';
                   2988:     }
                   2989:     return 'ok';
                   2990: }
                   2991: 
                   2992: sub version {
                   2993:     my ($userinput)=@_;
                   2994:     $remoteVERSION=(split(/:/,$userinput))[1];
                   2995:     return "version:$VERSION";
1.127     albertel 2996: }
                   2997: 
1.128     albertel 2998: #There is a copy of this in lonnet.pm
1.127     albertel 2999: sub userload {
                   3000:     my $numusers=0;
                   3001:     {
                   3002: 	opendir(LONIDS,$perlvar{'lonIDsDir'});
                   3003: 	my $filename;
                   3004: 	my $curtime=time;
                   3005: 	while ($filename=readdir(LONIDS)) {
                   3006: 	    if ($filename eq '.' || $filename eq '..') {next;}
1.138     albertel 3007: 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159     albertel 3008: 	    if ($curtime-$mtime < 1800) { $numusers++; }
1.127     albertel 3009: 	}
                   3010: 	closedir(LONIDS);
                   3011:     }
                   3012:     my $userloadpercent=0;
                   3013:     my $maxuserload=$perlvar{'lonUserLoadLim'};
                   3014:     if ($maxuserload) {
1.129     albertel 3015: 	$userloadpercent=100*$numusers/$maxuserload;
1.127     albertel 3016:     }
1.130     albertel 3017:     $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127     albertel 3018:     return $userloadpercent;
1.91      albertel 3019: }
                   3020: 
1.61      harris41 3021: # ----------------------------------- POD (plain old documentation, CPAN style)
                   3022: 
                   3023: =head1 NAME
                   3024: 
                   3025: lond - "LON Daemon" Server (port "LOND" 5663)
                   3026: 
                   3027: =head1 SYNOPSIS
                   3028: 
1.74      harris41 3029: Usage: B<lond>
                   3030: 
                   3031: Should only be run as user=www.  This is a command-line script which
                   3032: is invoked by B<loncron>.  There is no expectation that a typical user
                   3033: will manually start B<lond> from the command-line.  (In other words,
                   3034: DO NOT START B<lond> YOURSELF.)
1.61      harris41 3035: 
                   3036: =head1 DESCRIPTION
                   3037: 
1.74      harris41 3038: There are two characteristics associated with the running of B<lond>,
                   3039: PROCESS MANAGEMENT (starting, stopping, handling child processes)
                   3040: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
                   3041: subscriptions, etc).  These are described in two large
                   3042: sections below.
                   3043: 
                   3044: B<PROCESS MANAGEMENT>
                   3045: 
1.61      harris41 3046: Preforker - server who forks first. Runs as a daemon. HUPs.
                   3047: Uses IDEA encryption
                   3048: 
1.74      harris41 3049: B<lond> forks off children processes that correspond to the other servers
                   3050: in the network.  Management of these processes can be done at the
                   3051: parent process level or the child process level.
                   3052: 
                   3053: B<logs/lond.log> is the location of log messages.
                   3054: 
                   3055: The process management is now explained in terms of linux shell commands,
                   3056: subroutines internal to this code, and signal assignments:
                   3057: 
                   3058: =over 4
                   3059: 
                   3060: =item *
                   3061: 
                   3062: PID is stored in B<logs/lond.pid>
                   3063: 
                   3064: This is the process id number of the parent B<lond> process.
                   3065: 
                   3066: =item *
                   3067: 
                   3068: SIGTERM and SIGINT
                   3069: 
                   3070: Parent signal assignment:
                   3071:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   3072: 
                   3073: Child signal assignment:
                   3074:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
                   3075: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
                   3076:  to restart a new child.)
                   3077: 
                   3078: Command-line invocations:
                   3079:  B<kill> B<-s> SIGTERM I<PID>
                   3080:  B<kill> B<-s> SIGINT I<PID>
                   3081: 
                   3082: Subroutine B<HUNTSMAN>:
                   3083:  This is only invoked for the B<lond> parent I<PID>.
                   3084: This kills all the children, and then the parent.
                   3085: The B<lonc.pid> file is cleared.
                   3086: 
                   3087: =item *
                   3088: 
                   3089: SIGHUP
                   3090: 
                   3091: Current bug:
                   3092:  This signal can only be processed the first time
                   3093: on the parent process.  Subsequent SIGHUP signals
                   3094: have no effect.
                   3095: 
                   3096: Parent signal assignment:
                   3097:  $SIG{HUP}  = \&HUPSMAN;
                   3098: 
                   3099: Child signal assignment:
                   3100:  none (nothing happens)
                   3101: 
                   3102: Command-line invocations:
                   3103:  B<kill> B<-s> SIGHUP I<PID>
                   3104: 
                   3105: Subroutine B<HUPSMAN>:
                   3106:  This is only invoked for the B<lond> parent I<PID>,
                   3107: This kills all the children, and then the parent.
                   3108: The B<lond.pid> file is cleared.
                   3109: 
                   3110: =item *
                   3111: 
                   3112: SIGUSR1
                   3113: 
                   3114: Parent signal assignment:
                   3115:  $SIG{USR1} = \&USRMAN;
                   3116: 
                   3117: Child signal assignment:
                   3118:  $SIG{USR1}= \&logstatus;
                   3119: 
                   3120: Command-line invocations:
                   3121:  B<kill> B<-s> SIGUSR1 I<PID>
                   3122: 
                   3123: Subroutine B<USRMAN>:
                   3124:  When invoked for the B<lond> parent I<PID>,
                   3125: SIGUSR1 is sent to all the children, and the status of
                   3126: each connection is logged.
1.144     foxr     3127: 
                   3128: =item *
                   3129: 
                   3130: SIGUSR2
                   3131: 
                   3132: Parent Signal assignment:
                   3133:     $SIG{USR2} = \&UpdateHosts
                   3134: 
                   3135: Child signal assignment:
                   3136:     NONE
                   3137: 
1.74      harris41 3138: 
                   3139: =item *
                   3140: 
                   3141: SIGCHLD
                   3142: 
                   3143: Parent signal assignment:
                   3144:  $SIG{CHLD} = \&REAPER;
                   3145: 
                   3146: Child signal assignment:
                   3147:  none
                   3148: 
                   3149: Command-line invocations:
                   3150:  B<kill> B<-s> SIGCHLD I<PID>
                   3151: 
                   3152: Subroutine B<REAPER>:
                   3153:  This is only invoked for the B<lond> parent I<PID>.
                   3154: Information pertaining to the child is removed.
                   3155: The socket port is cleaned up.
                   3156: 
                   3157: =back
                   3158: 
                   3159: B<SERVER-SIDE ACTIVITIES>
                   3160: 
                   3161: Server-side information can be accepted in an encrypted or non-encrypted
                   3162: method.
                   3163: 
                   3164: =over 4
                   3165: 
                   3166: =item ping
                   3167: 
                   3168: Query a client in the hosts.tab table; "Are you there?"
                   3169: 
                   3170: =item pong
                   3171: 
                   3172: Respond to a ping query.
                   3173: 
                   3174: =item ekey
                   3175: 
                   3176: Read in encrypted key, make cipher.  Respond with a buildkey.
                   3177: 
                   3178: =item load
                   3179: 
                   3180: Respond with CPU load based on a computation upon /proc/loadavg.
                   3181: 
                   3182: =item currentauth
                   3183: 
                   3184: Reply with current authentication information (only over an
                   3185: encrypted channel).
                   3186: 
                   3187: =item auth
                   3188: 
                   3189: Only over an encrypted channel, reply as to whether a user's
                   3190: authentication information can be validated.
                   3191: 
                   3192: =item passwd
                   3193: 
                   3194: Allow for a password to be set.
                   3195: 
                   3196: =item makeuser
                   3197: 
                   3198: Make a user.
                   3199: 
                   3200: =item passwd
                   3201: 
                   3202: Allow for authentication mechanism and password to be changed.
                   3203: 
                   3204: =item home
1.61      harris41 3205: 
1.74      harris41 3206: Respond to a question "are you the home for a given user?"
                   3207: 
                   3208: =item update
                   3209: 
                   3210: Update contents of a subscribed resource.
                   3211: 
                   3212: =item unsubscribe
                   3213: 
                   3214: The server is unsubscribing from a resource.
                   3215: 
                   3216: =item subscribe
                   3217: 
                   3218: The server is subscribing to a resource.
                   3219: 
                   3220: =item log
                   3221: 
                   3222: Place in B<logs/lond.log>
                   3223: 
                   3224: =item put
                   3225: 
                   3226: stores hash in namespace
                   3227: 
                   3228: =item rolesput
                   3229: 
                   3230: put a role into a user's environment
                   3231: 
                   3232: =item get
                   3233: 
                   3234: returns hash with keys from array
                   3235: reference filled in from namespace
                   3236: 
                   3237: =item eget
                   3238: 
                   3239: returns hash with keys from array
                   3240: reference filled in from namesp (encrypts the return communication)
                   3241: 
                   3242: =item rolesget
                   3243: 
                   3244: get a role from a user's environment
                   3245: 
                   3246: =item del
                   3247: 
                   3248: deletes keys out of array from namespace
                   3249: 
                   3250: =item keys
                   3251: 
                   3252: returns namespace keys
                   3253: 
                   3254: =item dump
                   3255: 
                   3256: dumps the complete (or key matching regexp) namespace into a hash
                   3257: 
                   3258: =item store
                   3259: 
                   3260: stores hash permanently
                   3261: for this url; hashref needs to be given and should be a \%hashname; the
                   3262: remaining args aren't required and if they aren't passed or are '' they will
                   3263: be derived from the ENV
                   3264: 
                   3265: =item restore
                   3266: 
                   3267: returns a hash for a given url
                   3268: 
                   3269: =item querysend
                   3270: 
                   3271: Tells client about the lonsql process that has been launched in response
                   3272: to a sent query.
                   3273: 
                   3274: =item queryreply
                   3275: 
                   3276: Accept information from lonsql and make appropriate storage in temporary
                   3277: file space.
                   3278: 
                   3279: =item idput
                   3280: 
                   3281: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
                   3282: for each student, defined perhaps by the institutional Registrar.)
                   3283: 
                   3284: =item idget
                   3285: 
                   3286: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
                   3287: for each student, defined perhaps by the institutional Registrar.)
                   3288: 
                   3289: =item tmpput
                   3290: 
                   3291: Accept and store information in temporary space.
                   3292: 
                   3293: =item tmpget
                   3294: 
                   3295: Send along temporarily stored information.
                   3296: 
                   3297: =item ls
                   3298: 
                   3299: List part of a user's directory.
                   3300: 
1.135     foxr     3301: =item pushtable
                   3302: 
                   3303: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
                   3304: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
                   3305: must be restored manually in case of a problem with the new table file.
                   3306: pushtable requires that the request be encrypted and validated via
                   3307: ValidateManager.  The form of the command is:
                   3308: enc:pushtable tablename <tablecontents> \n
                   3309: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
                   3310: cleartext newline.
                   3311: 
1.74      harris41 3312: =item Hanging up (exit or init)
                   3313: 
                   3314: What to do when a client tells the server that they (the client)
                   3315: are leaving the network.
                   3316: 
                   3317: =item unknown command
                   3318: 
                   3319: If B<lond> is sent an unknown command (not in the list above),
                   3320: it replys to the client "unknown_cmd".
1.135     foxr     3321: 
1.74      harris41 3322: 
                   3323: =item UNKNOWN CLIENT
                   3324: 
                   3325: If the anti-spoofing algorithm cannot verify the client,
                   3326: the client is rejected (with a "refused" message sent
                   3327: to the client, and the connection is closed.
                   3328: 
                   3329: =back
1.61      harris41 3330: 
                   3331: =head1 PREREQUISITES
                   3332: 
                   3333: IO::Socket
                   3334: IO::File
                   3335: Apache::File
                   3336: Symbol
                   3337: POSIX
                   3338: Crypt::IDEA
                   3339: LWP::UserAgent()
                   3340: GDBM_File
                   3341: Authen::Krb4
1.91      albertel 3342: Authen::Krb5
1.61      harris41 3343: 
                   3344: =head1 COREQUISITES
                   3345: 
                   3346: =head1 OSNAMES
                   3347: 
                   3348: linux
                   3349: 
                   3350: =head1 SCRIPT CATEGORIES
                   3351: 
                   3352: Server/Process
                   3353: 
                   3354: =cut

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