Annotation of loncom/lond, revision 1.207

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network
                      3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60      www         4: #
1.207   ! foxr        5: # $Id: lond,v 1.206 2004/07/22 23:08:43 raeburn Exp $
1.60      www         6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
1.167     foxr       13: # the Free Software Foundation; either version 2 of the License, or 
1.60      www        14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
1.178     foxr       23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
1.60      www        24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
1.161     foxr       27: 
                     28: 
1.60      www        29: # http://www.lon-capa.org/
                     30: #
1.54      harris41   31: 
1.134     albertel   32: use strict;
1.80      harris41   33: use lib '/home/httpd/lib/perl/';
                     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;
1.193     raeburn    48: use localenroll;
1.143     foxr       49: use File::Copy;
1.169     foxr       50: use LONCAPA::ConfigFileEdit;
1.200     matthew    51: use LONCAPA::lonlocal;
                     52: use LONCAPA::lonssl;
1.1       albertel   53: 
1.204     albertel   54: my $DEBUG = 0;		       # Non zero to enable debug log entries.
1.77      foxr       55: 
1.57      www        56: my $status='';
                     57: my $lastlog='';
                     58: 
1.207   ! foxr       59: my $VERSION='$Revision: 1.206 $'; #' stupid emacs
1.121     albertel   60: my $remoteVERSION;
1.115     albertel   61: my $currenthostid;
                     62: my $currentdomainid;
1.134     albertel   63: 
                     64: my $client;
1.200     matthew    65: my $clientip;			# IP address of client.
                     66: my $clientdns;			# DNS name of client.
                     67: my $clientname;			# LonCAPA name of client.
1.140     foxr       68: 
1.134     albertel   69: my $server;
1.200     matthew    70: my $thisserver;			# DNS of us.
                     71: 
                     72: my $keymode;
1.198     foxr       73: 
1.207   ! foxr       74: my $cipher;			# Cipher key negotiated with client
        !            75: my $tmpsnum = 0;		# Id of tmpputs.
        !            76: 
1.178     foxr       77: # 
                     78: #   Connection type is:
                     79: #      client                   - All client actions are allowed
                     80: #      manager                  - only management functions allowed.
                     81: #      both                     - Both management and client actions are allowed
                     82: #
1.161     foxr       83: 
1.178     foxr       84: my $ConnectionType;
1.161     foxr       85: 
1.200     matthew    86: my %hostid;			# ID's for hosts in cluster by ip.
                     87: my %hostdom;			# LonCAPA domain for hosts in cluster.
                     88: my %hostip;			# IPs for hosts in cluster.
                     89: my %hostdns;			# ID's of hosts looked up by DNS name.
1.161     foxr       90: 
1.178     foxr       91: my %managers;			# Ip -> manager names
1.161     foxr       92: 
1.178     foxr       93: my %perlvar;			# Will have the apache conf defined perl vars.
1.134     albertel   94: 
1.178     foxr       95: #
1.207   ! foxr       96: #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
        !            97: #    Each element of the hash contains a reference to an array that contains:
        !            98: #          A reference to a sub that executes the request corresponding to the keyword.
        !            99: #          A flag that is true if the request must be encoded to be acceptable.
        !           100: #          A mask with bits as follows:
        !           101: #                      CLIENT_OK    - Set when the function is allowed by ordinary clients
        !           102: #                      MANAGER_OK   - Set when the function is allowed to manager clients.
        !           103: #
        !           104: my $CLIENT_OK  = 1;
        !           105: my $MANAGER_OK = 2;
        !           106: my %Dispatcher;
        !           107: 
        !           108: 
        !           109: #
1.178     foxr      110: #  The array below are password error strings."
                    111: #
                    112: my $lastpwderror    = 13;		# Largest error number from lcpasswd.
                    113: my @passwderrors = ("ok",
                    114: 		   "lcpasswd must be run as user 'www'",
                    115: 		   "lcpasswd got incorrect number of arguments",
                    116: 		   "lcpasswd did not get the right nubmer of input text lines",
                    117: 		   "lcpasswd too many simultaneous pwd changes in progress",
                    118: 		   "lcpasswd User does not exist.",
                    119: 		   "lcpasswd Incorrect current passwd",
                    120: 		   "lcpasswd Unable to su to root.",
                    121: 		   "lcpasswd Cannot set new passwd.",
                    122: 		   "lcpasswd Username has invalid characters",
                    123: 		   "lcpasswd Invalid characters in password",
                    124: 		    "11", "12",
                    125: 		    "lcpasswd Password mismatch");
1.97      foxr      126: 
                    127: 
1.178     foxr      128: #  The array below are lcuseradd error strings.:
1.97      foxr      129: 
1.178     foxr      130: my $lastadderror = 13;
                    131: my @adderrors    = ("ok",
                    132: 		    "User ID mismatch, lcuseradd must run as user www",
                    133: 		    "lcuseradd Incorrect number of command line parameters must be 3",
                    134: 		    "lcuseradd Incorrect number of stdinput lines, must be 3",
                    135: 		    "lcuseradd Too many other simultaneous pwd changes in progress",
                    136: 		    "lcuseradd User does not exist",
                    137: 		    "lcuseradd Unable to make www member of users's group",
                    138: 		    "lcuseradd Unable to su to root",
                    139: 		    "lcuseradd Unable to set password",
                    140: 		    "lcuseradd Usrname has invalid characters",
                    141: 		    "lcuseradd Password has an invalid character",
                    142: 		    "lcuseradd User already exists",
                    143: 		    "lcuseradd Could not add user.",
                    144: 		    "lcuseradd Password mismatch");
1.97      foxr      145: 
1.96      foxr      146: 
1.207   ! foxr      147: 
        !           148: #
        !           149: #   Statistics that are maintained and dislayed in the status line.
        !           150: #
        !           151: my $Transactions;		# Number of attempted transactions.
        !           152: my $Failures;			# Number of transcations failed.
        !           153: 
        !           154: #   ResetStatistics: 
        !           155: #      Resets the statistics counters:
        !           156: #
        !           157: sub ResetStatistics {
        !           158:     $Transactions = 0;
        !           159:     $Failures     = 0;
        !           160: }
        !           161: 
        !           162: 
        !           163: 
1.200     matthew   164: #------------------------------------------------------------------------
                    165: #
                    166: #   LocalConnection
                    167: #     Completes the formation of a locally authenticated connection.
                    168: #     This function will ensure that the 'remote' client is really the
                    169: #     local host.  If not, the connection is closed, and the function fails.
                    170: #     If so, initcmd is parsed for the name of a file containing the
                    171: #     IDEA session key.  The fie is opened, read, deleted and the session
                    172: #     key returned to the caller.
                    173: #
                    174: # Parameters:
                    175: #   $Socket      - Socket open on client.
                    176: #   $initcmd     - The full text of the init command.
                    177: #
                    178: # Implicit inputs:
                    179: #    $clientdns  - The DNS name of the remote client.
                    180: #    $thisserver - Our DNS name.
                    181: #
                    182: # Returns:
                    183: #     IDEA session key on success.
                    184: #     undef on failure.
                    185: #
                    186: sub LocalConnection {
                    187:     my ($Socket, $initcmd) = @_;
                    188:     Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver");
                    189:     if($clientdns ne $thisserver) {
                    190: 	&logthis('<font color="red"> LocalConnection rejecting non local: '
                    191: 		 ."$clientdns ne $thisserver </font>");
                    192: 	close $Socket;
                    193: 	return undef;
                    194:     } 
                    195:     else {
                    196: 	chomp($initcmd);	# Get rid of \n in filename.
                    197: 	my ($init, $type, $name) = split(/:/, $initcmd);
                    198: 	Debug(" Init command: $init $type $name ");
                    199: 
                    200: 	# Require that $init = init, and $type = local:  Otherwise
                    201: 	# the caller is insane:
                    202: 
                    203: 	if(($init ne "init") && ($type ne "local")) {
                    204: 	    &logthis('<font color = "red"> LocalConnection: caller is insane! '
                    205: 		     ."init = $init, and type = $type </font>");
                    206: 	    close($Socket);;
                    207: 	    return undef;
                    208: 		
                    209: 	}
                    210: 	#  Now get the key filename:
                    211: 
                    212: 	my $IDEAKey = lonlocal::ReadKeyFile($name);
                    213: 	return $IDEAKey;
                    214:     }
                    215: }
                    216: #------------------------------------------------------------------------------
                    217: #
                    218: #  SSLConnection
                    219: #   Completes the formation of an ssh authenticated connection. The
                    220: #   socket is promoted to an ssl socket.  If this promotion and the associated
                    221: #   certificate exchange are successful, the IDEA key is generated and sent
                    222: #   to the remote peer via the SSL tunnel. The IDEA key is also returned to
                    223: #   the caller after the SSL tunnel is torn down.
                    224: #
                    225: # Parameters:
                    226: #   Name              Type             Purpose
                    227: #   $Socket          IO::Socket::INET  Plaintext socket.
                    228: #
                    229: # Returns:
                    230: #    IDEA key on success.
                    231: #    undef on failure.
                    232: #
                    233: sub SSLConnection {
                    234:     my $Socket   = shift;
                    235: 
                    236:     Debug("SSLConnection: ");
                    237:     my $KeyFile         = lonssl::KeyFile();
                    238:     if(!$KeyFile) {
                    239: 	my $err = lonssl::LastError();
                    240: 	&logthis("<font color=\"red\"> CRITICAL"
                    241: 		 ."Can't get key file $err </font>");
                    242: 	return undef;
                    243:     }
                    244:     my ($CACertificate,
                    245: 	$Certificate) = lonssl::CertificateFile();
                    246: 
                    247: 
                    248:     # If any of the key, certificate or certificate authority 
                    249:     # certificate filenames are not defined, this can't work.
                    250: 
                    251:     if((!$Certificate) || (!$CACertificate)) {
                    252: 	my $err = lonssl::LastError();
                    253: 	&logthis("<font color=\"red\"> CRITICAL"
                    254: 		 ."Can't get certificates: $err </font>");
                    255: 
                    256: 	return undef;
                    257:     }
                    258:     Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
                    259: 
                    260:     # Indicate to our peer that we can procede with
                    261:     # a transition to ssl authentication:
                    262: 
                    263:     print $Socket "ok:ssl\n";
                    264: 
                    265:     Debug("Approving promotion -> ssl");
                    266:     #  And do so:
                    267: 
                    268:     my $SSLSocket = lonssl::PromoteServerSocket($Socket,
                    269: 						$CACertificate,
                    270: 						$Certificate,
                    271: 						$KeyFile);
                    272:     if(! ($SSLSocket) ) {	# SSL socket promotion failed.
                    273: 	my $err = lonssl::LastError();
                    274: 	&logthis("<font color=\"red\"> CRITICAL "
                    275: 		 ."SSL Socket promotion failed: $err </font>");
                    276: 	return undef;
                    277:     }
                    278:     Debug("SSL Promotion successful");
                    279: 
                    280:     # 
                    281:     #  The only thing we'll use the socket for is to send the IDEA key
                    282:     #  to the peer:
                    283: 
                    284:     my $Key = lonlocal::CreateCipherKey();
                    285:     print $SSLSocket "$Key\n";
                    286: 
                    287:     lonssl::Close($SSLSocket); 
                    288: 
                    289:     Debug("Key exchange complete: $Key");
                    290: 
                    291:     return $Key;
                    292: }
                    293: #
                    294: #     InsecureConnection: 
                    295: #        If insecure connections are allowd,
                    296: #        exchange a challenge with the client to 'validate' the
                    297: #        client (not really, but that's the protocol):
                    298: #        We produce a challenge string that's sent to the client.
                    299: #        The client must then echo the challenge verbatim to us.
                    300: #
                    301: #  Parameter:
                    302: #      Socket      - Socket open on the client.
                    303: #  Returns:
                    304: #      1           - success.
                    305: #      0           - failure (e.g.mismatch or insecure not allowed).
                    306: #
                    307: sub InsecureConnection {
                    308:     my $Socket  =  shift;
                    309: 
                    310:     #   Don't even start if insecure connections are not allowed.
                    311: 
                    312:     if(! $perlvar{londAllowInsecure}) {	# Insecure connections not allowed.
                    313: 	return 0;
                    314:     }
                    315: 
                    316:     #   Fabricate a challenge string and send it..
                    317: 
                    318:     my $challenge = "$$".time;	# pid + time.
                    319:     print $Socket "$challenge\n";
                    320:     &status("Waiting for challenge reply");
                    321: 
                    322:     my $answer = <$Socket>;
                    323:     $answer    =~s/\W//g;
                    324:     if($challenge eq $answer) {
                    325: 	return 1;
                    326:     } 
                    327:     else {
                    328: 	logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
                    329: 	&status("No challenge reqply");
                    330: 	return 0;
                    331:     }
                    332:     
                    333: 
                    334: }
                    335: 
1.96      foxr      336: #
1.140     foxr      337: #   GetCertificate: Given a transaction that requires a certificate,
                    338: #   this function will extract the certificate from the transaction
                    339: #   request.  Note that at this point, the only concept of a certificate
                    340: #   is the hostname to which we are connected.
                    341: #
                    342: #   Parameter:
                    343: #      request   - The request sent by our client (this parameterization may
                    344: #                  need to change when we really use a certificate granting
                    345: #                  authority.
                    346: #
                    347: sub GetCertificate {
                    348:     my $request = shift;
                    349: 
                    350:     return $clientip;
                    351: }
1.161     foxr      352: 
1.178     foxr      353: #
                    354: #   Return true if client is a manager.
                    355: #
                    356: sub isManager {
                    357:     return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
                    358: }
                    359: #
                    360: #   Return tru if client can do client functions
                    361: #
                    362: sub isClient {
                    363:     return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
                    364: }
1.161     foxr      365: 
                    366: 
1.156     foxr      367: #
                    368: #   ReadManagerTable: Reads in the current manager table. For now this is
                    369: #                     done on each manager authentication because:
                    370: #                     - These authentications are not frequent
                    371: #                     - This allows dynamic changes to the manager table
                    372: #                       without the need to signal to the lond.
                    373: #
                    374: 
                    375: sub ReadManagerTable {
                    376: 
                    377:     #   Clean out the old table first..
                    378: 
1.166     foxr      379:    foreach my $key (keys %managers) {
                    380:       delete $managers{$key};
                    381:    }
                    382: 
                    383:    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
                    384:    if (!open (MANAGERS, $tablename)) {
                    385:       logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
                    386:       return;
                    387:    }
                    388:    while(my $host = <MANAGERS>) {
                    389:       chomp($host);
                    390:       if ($host =~ "^#") {                  # Comment line.
                    391:          next;
                    392:       }
                    393:       if (!defined $hostip{$host}) { # This is a non cluster member
1.161     foxr      394: 	    #  The entry is of the form:
                    395: 	    #    cluname:hostname
                    396: 	    #  cluname - A 'cluster hostname' is needed in order to negotiate
                    397: 	    #            the host key.
                    398: 	    #  hostname- The dns name of the host.
                    399: 	    #
1.166     foxr      400:           my($cluname, $dnsname) = split(/:/, $host);
                    401:           
                    402:           my $ip = gethostbyname($dnsname);
                    403:           if(defined($ip)) {                 # bad names don't deserve entry.
                    404:             my $hostip = inet_ntoa($ip);
                    405:             $managers{$hostip} = $cluname;
                    406:             logthis('<font color="green"> registering manager '.
                    407:                     "$dnsname as $cluname with $hostip </font>\n");
                    408:          }
                    409:       } else {
                    410:          logthis('<font color="green"> existing host'." $host</font>\n");
                    411:          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
                    412:       }
                    413:    }
1.156     foxr      414: }
1.140     foxr      415: 
                    416: #
                    417: #  ValidManager: Determines if a given certificate represents a valid manager.
                    418: #                in this primitive implementation, the 'certificate' is
                    419: #                just the connecting loncapa client name.  This is checked
                    420: #                against a valid client list in the configuration.
                    421: #
                    422: #                  
                    423: sub ValidManager {
                    424:     my $certificate = shift; 
                    425: 
1.163     foxr      426:     return isManager;
1.140     foxr      427: }
                    428: #
1.143     foxr      429: #  CopyFile:  Called as part of the process of installing a 
                    430: #             new configuration file.  This function copies an existing
                    431: #             file to a backup file.
                    432: # Parameters:
                    433: #     oldfile  - Name of the file to backup.
                    434: #     newfile  - Name of the backup file.
                    435: # Return:
                    436: #     0   - Failure (errno has failure reason).
                    437: #     1   - Success.
                    438: #
                    439: sub CopyFile {
1.192     foxr      440: 
                    441:     my ($oldfile, $newfile) = @_;
1.143     foxr      442: 
                    443:     #  The file must exist:
                    444: 
                    445:     if(-e $oldfile) {
                    446: 
                    447: 	 # Read the old file.
                    448: 
                    449: 	my $oldfh = IO::File->new("< $oldfile");
                    450: 	if(!$oldfh) {
                    451: 	    return 0;
                    452: 	}
                    453: 	my @contents = <$oldfh>;  # Suck in the entire file.
                    454: 
                    455: 	# write the backup file:
                    456: 
                    457: 	my $newfh = IO::File->new("> $newfile");
                    458: 	if(!(defined $newfh)){
                    459: 	    return 0;
                    460: 	}
                    461: 	my $lines = scalar @contents;
                    462: 	for (my $i =0; $i < $lines; $i++) {
                    463: 	    print $newfh ($contents[$i]);
                    464: 	}
                    465: 
                    466: 	$oldfh->close;
                    467: 	$newfh->close;
                    468: 
                    469: 	chmod(0660, $newfile);
                    470: 
                    471: 	return 1;
                    472: 	    
                    473:     } else {
                    474: 	return 0;
                    475:     }
                    476: }
1.157     foxr      477: #
                    478: #  Host files are passed out with externally visible host IPs.
                    479: #  If, for example, we are behind a fire-wall or NAT host, our 
                    480: #  internally visible IP may be different than the externally
                    481: #  visible IP.  Therefore, we always adjust the contents of the
                    482: #  host file so that the entry for ME is the IP that we believe
                    483: #  we have.  At present, this is defined as the entry that
                    484: #  DNS has for us.  If by some chance we are not able to get a
                    485: #  DNS translation for us, then we assume that the host.tab file
                    486: #  is correct.  
                    487: #    BUGBUGBUG - in the future, we really should see if we can
                    488: #       easily query the interface(s) instead.
                    489: # Parameter(s):
                    490: #     contents    - The contents of the host.tab to check.
                    491: # Returns:
                    492: #     newcontents - The adjusted contents.
                    493: #
                    494: #
                    495: sub AdjustHostContents {
                    496:     my $contents  = shift;
                    497:     my $adjusted;
                    498:     my $me        = $perlvar{'lonHostID'};
                    499: 
1.166     foxr      500:  foreach my $line (split(/\n/,$contents)) {
1.157     foxr      501: 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
                    502: 	    chomp($line);
                    503: 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
                    504: 	    if ($id eq $me) {
1.166     foxr      505:           my $ip = gethostbyname($name);
                    506:           my $ipnew = inet_ntoa($ip);
                    507:          $ip = $ipnew;
1.157     foxr      508: 		#  Reconstruct the host line and append to adjusted:
                    509: 		
1.166     foxr      510: 		   my $newline = "$id:$domain:$role:$name:$ip";
                    511: 		   if($maxcon ne "") { # Not all hosts have loncnew tuning params
                    512: 		     $newline .= ":$maxcon:$idleto:$mincon";
                    513: 		   }
                    514: 		   $adjusted .= $newline."\n";
1.157     foxr      515: 		
1.166     foxr      516:       } else {		# Not me, pass unmodified.
                    517: 		   $adjusted .= $line."\n";
                    518:       }
1.157     foxr      519: 	} else {                  # Blank or comment never re-written.
                    520: 	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
                    521: 	}
1.166     foxr      522:  }
                    523:  return $adjusted;
1.157     foxr      524: }
1.143     foxr      525: #
                    526: #   InstallFile: Called to install an administrative file:
                    527: #       - The file is created with <name>.tmp
                    528: #       - The <name>.tmp file is then mv'd to <name>
                    529: #   This lugubrious procedure is done to ensure that we are never without
                    530: #   a valid, even if dated, version of the file regardless of who crashes
                    531: #   and when the crash occurs.
                    532: #
                    533: #  Parameters:
                    534: #       Name of the file
                    535: #       File Contents.
                    536: #  Return:
                    537: #      nonzero - success.
                    538: #      0       - failure and $! has an errno.
                    539: #
                    540: sub InstallFile {
1.192     foxr      541: 
                    542:     my ($Filename, $Contents) = @_;
1.143     foxr      543:     my $TempFile = $Filename.".tmp";
                    544: 
                    545:     #  Open the file for write:
                    546: 
                    547:     my $fh = IO::File->new("> $TempFile"); # Write to temp.
                    548:     if(!(defined $fh)) {
                    549: 	&logthis('<font color="red"> Unable to create '.$TempFile."</font>");
                    550: 	return 0;
                    551:     }
                    552:     #  write the contents of the file:
                    553: 
                    554:     print $fh ($Contents); 
                    555:     $fh->close;			# In case we ever have a filesystem w. locking
                    556: 
                    557:     chmod(0660, $TempFile);
                    558: 
                    559:     # Now we can move install the file in position.
                    560:     
                    561:     move($TempFile, $Filename);
                    562: 
                    563:     return 1;
                    564: }
1.200     matthew   565: 
                    566: 
1.169     foxr      567: #
                    568: #   ConfigFileFromSelector: converts a configuration file selector
                    569: #                 (one of host or domain at this point) into a 
                    570: #                 configuration file pathname.
                    571: #
                    572: #  Parameters:
                    573: #      selector  - Configuration file selector.
                    574: #  Returns:
                    575: #      Full path to the file or undef if the selector is invalid.
                    576: #
                    577: sub ConfigFileFromSelector {
                    578:     my $selector   = shift;
                    579:     my $tablefile;
                    580: 
                    581:     my $tabledir = $perlvar{'lonTabDir'}.'/';
                    582:     if ($selector eq "hosts") {
                    583: 	$tablefile = $tabledir."hosts.tab";
                    584:     } elsif ($selector eq "domain") {
                    585: 	$tablefile = $tabledir."domain.tab";
                    586:     } else {
                    587: 	return undef;
                    588:     }
                    589:     return $tablefile;
1.143     foxr      590: 
1.169     foxr      591: }
1.143     foxr      592: #
1.141     foxr      593: #   PushFile:  Called to do an administrative push of a file.
                    594: #              - Ensure the file being pushed is one we support.
                    595: #              - Backup the old file to <filename.saved>
                    596: #              - Separate the contents of the new file out from the
                    597: #                rest of the request.
                    598: #              - Write the new file.
                    599: #  Parameter:
                    600: #     Request - The entire user request.  This consists of a : separated
                    601: #               string pushfile:tablename:contents.
                    602: #     NOTE:  The contents may have :'s in it as well making things a bit
                    603: #            more interesting... but not much.
                    604: #  Returns:
                    605: #     String to send to client ("ok" or "refused" if bad file).
                    606: #
                    607: sub PushFile {
                    608:     my $request = shift;    
                    609:     my ($command, $filename, $contents) = split(":", $request, 3);
                    610:     
                    611:     #  At this point in time, pushes for only the following tables are
                    612:     #  supported:
                    613:     #   hosts.tab  ($filename eq host).
                    614:     #   domain.tab ($filename eq domain).
                    615:     # Construct the destination filename or reject the request.
                    616:     #
                    617:     # lonManage is supposed to ensure this, however this session could be
                    618:     # part of some elaborate spoof that managed somehow to authenticate.
                    619:     #
                    620: 
1.169     foxr      621: 
                    622:     my $tablefile = ConfigFileFromSelector($filename);
                    623:     if(! (defined $tablefile)) {
1.141     foxr      624: 	return "refused";
                    625:     }
                    626:     #
                    627:     # >copy< the old table to the backup table
                    628:     #        don't rename in case system crashes/reboots etc. in the time
                    629:     #        window between a rename and write.
                    630:     #
                    631:     my $backupfile = $tablefile;
                    632:     $backupfile    =~ s/\.tab$/.old/;
1.143     foxr      633:     if(!CopyFile($tablefile, $backupfile)) {
                    634: 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
                    635: 	return "error:$!";
                    636:     }
1.141     foxr      637:     &logthis('<font color="green"> Pushfile: backed up '
                    638: 	    .$tablefile." to $backupfile</font>");
                    639:     
1.157     foxr      640:     #  If the file being pushed is the host file, we adjust the entry for ourself so that the
                    641:     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
                    642:     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
                    643:     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
                    644:     #  that possibilty.
                    645: 
                    646:     if($filename eq "host") {
                    647: 	$contents = AdjustHostContents($contents);
                    648:     }
                    649: 
1.141     foxr      650:     #  Install the new file:
                    651: 
1.143     foxr      652:     if(!InstallFile($tablefile, $contents)) {
                    653: 	&logthis('<font color="red"> Pushfile: unable to install '
1.145     foxr      654: 	 .$tablefile." $! </font>");
1.143     foxr      655: 	return "error:$!";
                    656:     }
                    657:     else {
                    658: 	&logthis('<font color="green"> Installed new '.$tablefile
                    659: 		 ."</font>");
                    660: 
                    661:     }
                    662: 
1.141     foxr      663: 
                    664:     #  Indicate success:
                    665:  
                    666:     return "ok";
                    667: 
                    668: }
1.145     foxr      669: 
                    670: #
                    671: #  Called to re-init either lonc or lond.
                    672: #
                    673: #  Parameters:
                    674: #    request   - The full request by the client.  This is of the form
                    675: #                reinit:<process>  
                    676: #                where <process> is allowed to be either of 
                    677: #                lonc or lond
                    678: #
                    679: #  Returns:
                    680: #     The string to be sent back to the client either:
                    681: #   ok         - Everything worked just fine.
                    682: #   error:why  - There was a failure and why describes the reason.
                    683: #
                    684: #
                    685: sub ReinitProcess {
                    686:     my $request = shift;
                    687: 
1.146     foxr      688: 
                    689:     # separate the request (reinit) from the process identifier and
                    690:     # validate it producing the name of the .pid file for the process.
                    691:     #
                    692:     #
                    693:     my ($junk, $process) = split(":", $request);
1.147     foxr      694:     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146     foxr      695:     if($process eq 'lonc') {
                    696: 	$processpidfile = $processpidfile."lonc.pid";
1.147     foxr      697: 	if (!open(PIDFILE, "< $processpidfile")) {
                    698: 	    return "error:Open failed for $processpidfile";
                    699: 	}
                    700: 	my $loncpid = <PIDFILE>;
                    701: 	close(PIDFILE);
                    702: 	logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
                    703: 		."</font>");
                    704: 	kill("USR2", $loncpid);
1.146     foxr      705:     } elsif ($process eq 'lond') {
1.147     foxr      706: 	logthis('<font color="red"> Reinitializing self (lond) </font>');
                    707: 	&UpdateHosts;			# Lond is us!!
1.146     foxr      708:     } else {
                    709: 	&logthis('<font color="yellow" Invalid reinit request for '.$process
                    710: 		 ."</font>");
                    711: 	return "error:Invalid process identifier $process";
                    712:     }
1.145     foxr      713:     return 'ok';
                    714: }
1.168     foxr      715: #   Validate a line in a configuration file edit script:
                    716: #   Validation includes:
                    717: #     - Ensuring the command is valid.
                    718: #     - Ensuring the command has sufficient parameters
                    719: #   Parameters:
                    720: #     scriptline - A line to validate (\n has been stripped for what it's worth).
1.167     foxr      721: #
1.168     foxr      722: #   Return:
                    723: #      0     - Invalid scriptline.
                    724: #      1     - Valid scriptline
                    725: #  NOTE:
                    726: #     Only the command syntax is checked, not the executability of the
                    727: #     command.
                    728: #
                    729: sub isValidEditCommand {
                    730:     my $scriptline = shift;
                    731: 
                    732:     #   Line elements are pipe separated:
                    733: 
                    734:     my ($command, $key, $newline)  = split(/\|/, $scriptline);
                    735:     &logthis('<font color="green"> isValideditCommand checking: '.
                    736: 	     "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
                    737:     
                    738:     if ($command eq "delete") {
                    739: 	#
                    740: 	#   key with no newline.
                    741: 	#
                    742: 	if( ($key eq "") || ($newline ne "")) {
                    743: 	    return 0;		# Must have key but no newline.
                    744: 	} else {
                    745: 	    return 1;		# Valid syntax.
                    746: 	}
1.169     foxr      747:     } elsif ($command eq "replace") {
1.168     foxr      748: 	#
                    749: 	#   key and newline:
                    750: 	#
                    751: 	if (($key eq "") || ($newline eq "")) {
                    752: 	    return 0;
                    753: 	} else {
                    754: 	    return 1;
                    755: 	}
1.169     foxr      756:     } elsif ($command eq "append") {
                    757: 	if (($key ne "") && ($newline eq "")) {
                    758: 	    return 1;
                    759: 	} else {
                    760: 	    return 0;
                    761: 	}
1.168     foxr      762:     } else {
                    763: 	return 0;		# Invalid command.
                    764:     }
                    765:     return 0;			# Should not get here!!!
                    766: }
1.169     foxr      767: #
                    768: #   ApplyEdit - Applies an edit command to a line in a configuration 
                    769: #               file.  It is the caller's responsiblity to validate the
                    770: #               edit line.
                    771: #   Parameters:
                    772: #      $directive - A single edit directive to apply.  
                    773: #                   Edit directives are of the form:
                    774: #                  append|newline      - Appends a new line to the file.
                    775: #                  replace|key|newline - Replaces the line with key value 'key'
                    776: #                  delete|key          - Deletes the line with key value 'key'.
                    777: #      $editor   - A config file editor object that contains the
                    778: #                  file being edited.
                    779: #
                    780: sub ApplyEdit {
1.192     foxr      781: 
                    782:     my ($directive, $editor) = @_;
1.169     foxr      783: 
                    784:     # Break the directive down into its command and its parameters
                    785:     # (at most two at this point.  The meaning of the parameters, if in fact
                    786:     #  they exist depends on the command).
                    787: 
                    788:     my ($command, $p1, $p2) = split(/\|/, $directive);
                    789: 
                    790:     if($command eq "append") {
                    791: 	$editor->Append($p1);	          # p1 - key p2 null.
                    792:     } elsif ($command eq "replace") {
                    793: 	$editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.
                    794:     } elsif ($command eq "delete") {
                    795: 	$editor->DeleteLine($p1);         # p1 - key p2 null.
                    796:     } else {			          # Should not get here!!!
                    797: 	die "Invalid command given to ApplyEdit $command"
                    798:     }
                    799: }
                    800: #
                    801: # AdjustOurHost:
                    802: #           Adjusts a host file stored in a configuration file editor object
                    803: #           for the true IP address of this host. This is necessary for hosts
                    804: #           that live behind a firewall.
                    805: #           Those hosts have a publicly distributed IP of the firewall, but
                    806: #           internally must use their actual IP.  We assume that a given
                    807: #           host only has a single IP interface for now.
                    808: # Formal Parameters:
                    809: #     editor   - The configuration file editor to adjust.  This
                    810: #                editor is assumed to contain a hosts.tab file.
                    811: # Strategy:
                    812: #    - Figure out our hostname.
                    813: #    - Lookup the entry for this host.
                    814: #    - Modify the line to contain our IP
                    815: #    - Do a replace for this host.
                    816: sub AdjustOurHost {
                    817:     my $editor        = shift;
                    818: 
                    819:     # figure out who I am.
                    820: 
                    821:     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.
                    822: 
                    823:     #  Get my host file entry.
                    824: 
                    825:     my $ConfigLine    = $editor->Find($myHostName);
                    826:     if(! (defined $ConfigLine)) {
                    827: 	die "AdjustOurHost - no entry for me in hosts file $myHostName";
                    828:     }
                    829:     # figure out my IP:
                    830:     #   Use the config line to get my hostname.
                    831:     #   Use gethostbyname to translate that into an IP address.
                    832:     #
                    833:     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
                    834:     my $BinaryIp = gethostbyname($name);
                    835:     my $ip       = inet_ntoa($ip);
                    836:     #
                    837:     #  Reassemble the config line from the elements in the list.
                    838:     #  Note that if the loncnew items were not present before, they will
                    839:     #  be now even if they would be empty
                    840:     #
                    841:     my $newConfigLine = $id;
                    842:     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
                    843: 	$newConfigLine .= ":".$item;
                    844:     }
                    845:     #  Replace the line:
                    846: 
                    847:     $editor->ReplaceLine($id, $newConfigLine);
                    848:     
                    849: }
                    850: #
                    851: #   ReplaceConfigFile:
                    852: #              Replaces a configuration file with the contents of a
                    853: #              configuration file editor object.
                    854: #              This is done by:
                    855: #              - Copying the target file to <filename>.old
                    856: #              - Writing the new file to <filename>.tmp
                    857: #              - Moving <filename.tmp>  -> <filename>
                    858: #              This laborious process ensures that the system is never without
                    859: #              a configuration file that's at least valid (even if the contents
                    860: #              may be dated).
                    861: #   Parameters:
                    862: #        filename   - Name of the file to modify... this is a full path.
                    863: #        editor     - Editor containing the file.
                    864: #
                    865: sub ReplaceConfigFile {
1.192     foxr      866:     
                    867:     my ($filename, $editor) = @_;
1.168     foxr      868: 
1.169     foxr      869:     CopyFile ($filename, $filename.".old");
                    870: 
                    871:     my $contents  = $editor->Get(); # Get the contents of the file.
                    872: 
                    873:     InstallFile($filename, $contents);
                    874: }
1.168     foxr      875: #   
                    876: #
                    877: #   Called to edit a configuration table  file
1.167     foxr      878: #   Parameters:
                    879: #      request           - The entire command/request sent by lonc or lonManage
                    880: #   Return:
                    881: #      The reply to send to the client.
1.168     foxr      882: #
1.167     foxr      883: sub EditFile {
                    884:     my $request = shift;
                    885: 
                    886:     #  Split the command into it's pieces:  edit:filetype:script
                    887: 
1.168     foxr      888:     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
1.167     foxr      889: 
                    890:     #  Check the pre-coditions for success:
                    891: 
                    892:     if($request != "edit") {	# Something is amiss afoot alack.
                    893: 	return "error:edit request detected, but request != 'edit'\n";
                    894:     }
                    895:     if( ($filetype ne "hosts")  &&
                    896: 	($filetype ne "domain")) {
                    897: 	return "error:edit requested with invalid file specifier: $filetype \n";
                    898:     }
                    899: 
                    900:     #   Split the edit script and check it's validity.
1.168     foxr      901: 
                    902:     my @scriptlines = split(/\n/, $script);  # one line per element.
                    903:     my $linecount   = scalar(@scriptlines);
                    904:     for(my $i = 0; $i < $linecount; $i++) {
                    905: 	chomp($scriptlines[$i]);
                    906: 	if(!isValidEditCommand($scriptlines[$i])) {
                    907: 	    return "error:edit with bad script line: '$scriptlines[$i]' \n";
                    908: 	}
                    909:     }
1.145     foxr      910: 
1.167     foxr      911:     #   Execute the edit operation.
1.169     foxr      912:     #   - Create a config file editor for the appropriate file and 
                    913:     #   - execute each command in the script:
                    914:     #
                    915:     my $configfile = ConfigFileFromSelector($filetype);
                    916:     if (!(defined $configfile)) {
                    917: 	return "refused\n";
                    918:     }
                    919:     my $editor = ConfigFileEdit->new($configfile);
1.167     foxr      920: 
1.169     foxr      921:     for (my $i = 0; $i < $linecount; $i++) {
                    922: 	ApplyEdit($scriptlines[$i], $editor);
                    923:     }
                    924:     # If the file is the host file, ensure that our host is
                    925:     # adjusted to have our ip:
                    926:     #
                    927:     if($filetype eq "host") {
                    928: 	AdjustOurHost($editor);
                    929:     }
                    930:     #  Finally replace the current file with our file.
                    931:     #
                    932:     ReplaceConfigFile($configfile, $editor);
1.167     foxr      933: 
                    934:     return "ok\n";
                    935: }
1.207   ! foxr      936: 
        !           937: #---------------------------------------------------------------
        !           938: #
        !           939: # Manipulation of hash based databases (factoring out common code
        !           940: # for later use as we refactor.
        !           941: #
        !           942: #  Ties a domain level resource file to a hash.
        !           943: #  If requested a history entry is created in the associated hist file.
        !           944: #
        !           945: #  Parameters:
        !           946: #     domain    - Name of the domain in which the resource file lives.
        !           947: #     namespace - Name of the hash within that domain.
        !           948: #     how       - How to tie the hash (e.g. GDBM_WRCREAT()).
        !           949: #     loghead   - Optional parameter, if present a log entry is created
        !           950: #                 in the associated history file and this is the first part
        !           951: #                  of that entry.
        !           952: #     logtail   - Goes along with loghead,  The actual logentry is of the
        !           953: #                 form $loghead:<timestamp>:logtail.
        !           954: # Returns:
        !           955: #    Reference to a hash bound to the db file or alternatively undef
        !           956: #    if the tie failed.
        !           957: #
        !           958: sub TieDomainHash {
        !           959:     my ($domain, 
        !           960: 	$namespace,
        !           961: 	$how)     = @_;
        !           962:     
        !           963:     # Filter out any whitespace in the domain name:
        !           964:     
        !           965:     $domain =~ s/\W//g;
        !           966:     
        !           967:     # We have enough to go on to tie the hash:
        !           968:     
        !           969:     my $user_top_dir   = $perlvar{'lonUsersDir'};
        !           970:     my $domain_dir     = $user_top_dir."/$domain";
        !           971:     my $resource_file  = $domain_dir."/$namespace.db";
        !           972:     my %hash;
        !           973:     if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
        !           974: 	if (scalar @_) {	# Need to log the operation.
        !           975: 	    my $logFh = IO::File->new(">>domain_dir/$namespace.hist");
        !           976: 	    if($logFh) {
        !           977: 		my $timestamp = time;
        !           978: 		my ($loghead, $logtail) = @_;
        !           979: 		print $logFh "$loghead:$timestamp:$logtail\n";
        !           980: 	    }
        !           981: 	}
        !           982: 	return \%hash;		# Return the tied hash.
        !           983:     }
        !           984:     else {
        !           985: 	return undef;		# Tie failed.
        !           986:     }
        !           987: }
        !           988: 
        !           989: #
        !           990: #   Ties a user's resource file to a hash.  
        !           991: #   If necessary, an appropriate history
        !           992: #   log file entry is made as well.
        !           993: #   This sub factors out common code from the subs that manipulate
        !           994: #   the various gdbm files that keep keyword value pairs.
        !           995: # Parameters:
        !           996: #   domain       - Name of the domain the user is in.
        !           997: #   user         - Name of the 'current user'.
        !           998: #   namespace    - Namespace representing the file to tie.
        !           999: #   how          - What the tie is done to (e.g. GDBM_WRCREAT().
        !          1000: #   loghead      - Optional first part of log entry if there may be a
        !          1001: #                  history file.
        !          1002: #   what         - Optional tail of log entry if there may be a history
        !          1003: #                  file.
        !          1004: # Returns:
        !          1005: #   hash to which the database is tied.  It's up to the caller to untie.
        !          1006: #   undef if the has could not be tied.
        !          1007: #
        !          1008: sub TieUserHash {
        !          1009:     my ($domain,
        !          1010: 	$user,
        !          1011: 	$namespace,
        !          1012: 	$how)       = @_;
        !          1013: 
        !          1014:     
        !          1015:     $namespace=~s/\//\_/g;	# / -> _
        !          1016:     $namespace=~s/\W//g;		# whitespace eliminated.
        !          1017:     my $proname     = propath($domain, $user);
        !          1018:    
        !          1019:     # If this is a namespace for which a history is kept,
        !          1020:     # make the history log entry:
        !          1021:     
        !          1022:     
        !          1023:     if (($namespace =~/^nohist\_/) && (scalar @_ > 0)) {
        !          1024: 	my $args = scalar @_;
        !          1025: 	Debug(" Opening history: $namespace $args");
        !          1026: 	my $hfh = IO::File->new(">>$proname/$namespace.hist"); 
        !          1027: 	if($hfh) {
        !          1028: 	    my $now = time;
        !          1029: 	    my $loghead  = shift;
        !          1030: 	    my $what    = shift;
        !          1031: 	    print $hfh "$loghead:$now:$what\n";
        !          1032: 	}
        !          1033:     }
        !          1034:     #  Tie the database.
        !          1035:     
        !          1036:     my %hash;
        !          1037:     if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
        !          1038: 	   $how, 0640)) {
        !          1039: 	return \%hash;
        !          1040:     }
        !          1041:     else {
        !          1042: 	return undef;
        !          1043:     }
        !          1044:     
        !          1045: }
        !          1046: #---------------------------------------------------------------
        !          1047: #
        !          1048: #   Getting, decoding and dispatching requests:
        !          1049: #
        !          1050: 
        !          1051: #
        !          1052: #   Get a Request:
        !          1053: #   Gets a Request message from the client.  The transaction
        !          1054: #   is defined as a 'line' of text.  We remove the new line
        !          1055: #   from the text line.  
        !          1056: #   
        !          1057: sub GetRequest {
        !          1058:     my $input = <$client>;
        !          1059:     chomp($input);
        !          1060: 
        !          1061:     Debug("Request = $input\n");
        !          1062: 
        !          1063:     &status('Processing '.$clientname.':'.$input);
        !          1064: 
        !          1065:     return $input;
        !          1066: }
        !          1067: #
        !          1068: #   Decipher encoded traffic
        !          1069: #  Parameters:
        !          1070: #     input      - Encoded data.
        !          1071: #  Returns:
        !          1072: #     Decoded data or undef if encryption key was not yet negotiated.
        !          1073: #  Implicit input:
        !          1074: #     cipher  - This global holds the negotiated encryption key.
        !          1075: #
        !          1076: sub Decipher {
        !          1077:     my ($input)  = @_;
        !          1078:     my $output = '';
        !          1079:    
        !          1080:    
        !          1081:     if($cipher) {
        !          1082: 	my($enc, $enclength, $encinput) = split(/:/, $input);
        !          1083: 	for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
        !          1084: 	    $output .= 
        !          1085: 		$cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
        !          1086: 	}
        !          1087: 	return substr($output, 0, $enclength);
        !          1088:     } else {
        !          1089: 	return undef;
        !          1090:     }
        !          1091: }
        !          1092: 
        !          1093: #
        !          1094: #   Register a command processor.  This function is invoked to register a sub
        !          1095: #   to process a request.  Once registered, the ProcessRequest sub can automatically
        !          1096: #   dispatch requests to an appropriate sub, and do the top level validity checking
        !          1097: #   as well:
        !          1098: #    - Is the keyword recognized.
        !          1099: #    - Is the proper client type attempting the request.
        !          1100: #    - Is the request encrypted if it has to be.
        !          1101: #   Parameters:
        !          1102: #    $request_name         - Name of the request being registered.
        !          1103: #                           This is the command request that will match
        !          1104: #                           against the hash keywords to lookup the information
        !          1105: #                           associated with the dispatch information.
        !          1106: #    $procedure           - Reference to a sub to call to process the request.
        !          1107: #                           All subs get called as follows:
        !          1108: #                             Procedure($cmd, $tail, $replyfd, $key)
        !          1109: #                             $cmd    - the actual keyword that invoked us.
        !          1110: #                             $tail   - the tail of the request that invoked us.
        !          1111: #                             $replyfd- File descriptor connected to the client
        !          1112: #    $must_encode          - True if the request must be encoded to be good.
        !          1113: #    $client_ok            - True if it's ok for a client to request this.
        !          1114: #    $manager_ok           - True if it's ok for a manager to request this.
        !          1115: # Side effects:
        !          1116: #      - On success, the Dispatcher hash has an entry added for the key $RequestName
        !          1117: #      - On failure, the program will die as it's a bad internal bug to try to 
        !          1118: #        register a duplicate command handler.
        !          1119: #
        !          1120: sub RegisterHandler {
        !          1121:     my ($request_name,
        !          1122: 	$procedure,
        !          1123: 	$must_encode,
        !          1124: 	$client_ok,
        !          1125: 	$manager_ok)   = @_;
        !          1126: 
        !          1127:     #  Don't allow duplication#
        !          1128:    
        !          1129:     if (defined $Dispatcher{$request_name}) {
        !          1130: 	die "Attempting to define a duplicate request handler for $request_name\n";
        !          1131:     }
        !          1132:     #   Build the client type mask:
        !          1133:     
        !          1134:     my $client_type_mask = 0;
        !          1135:     if($client_ok) {
        !          1136: 	$client_type_mask  |= $CLIENT_OK;
        !          1137:     }
        !          1138:     if($manager_ok) {
        !          1139: 	$client_type_mask  |= $MANAGER_OK;
        !          1140:     }
        !          1141:    
        !          1142:     #  Enter the hash:
        !          1143:       
        !          1144:     my @entry = ($procedure, $must_encode, $client_type_mask);
        !          1145:    
        !          1146:     $Dispatcher{$request_name} = \@entry;
        !          1147:    
        !          1148:    
        !          1149: }
        !          1150: 
        !          1151: 
        !          1152: #------------------------------------------------------------------
        !          1153: 
        !          1154: 
        !          1155: 
        !          1156: 
1.141     foxr     1157: #
1.96      foxr     1158: #  Convert an error return code from lcpasswd to a string value.
                   1159: #
                   1160: sub lcpasswdstrerror {
                   1161:     my $ErrorCode = shift;
1.97      foxr     1162:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96      foxr     1163: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
                   1164:     } else {
1.98      foxr     1165: 	return $passwderrors[$ErrorCode];
1.96      foxr     1166:     }
                   1167: }
                   1168: 
1.97      foxr     1169: #
                   1170: # Convert an error return code from lcuseradd to a string value:
                   1171: #
                   1172: sub lcuseraddstrerror {
                   1173:     my $ErrorCode = shift;
                   1174:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
                   1175: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
                   1176:     } else {
1.98      foxr     1177: 	return $adderrors[$ErrorCode];
1.97      foxr     1178:     }
                   1179: }
                   1180: 
1.23      harris41 1181: # grabs exception and records it to log before exiting
                   1182: sub catchexception {
1.27      albertel 1183:     my ($error)=@_;
1.25      www      1184:     $SIG{'QUIT'}='DEFAULT';
                   1185:     $SIG{__DIE__}='DEFAULT';
1.165     albertel 1186:     &status("Catching exception");
1.190     albertel 1187:     &logthis("<font color='red'>CRITICAL: "
1.134     albertel 1188:      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
1.27      albertel 1189:      ."a crash with this error msg->[$error]</font>");
1.57      www      1190:     &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27      albertel 1191:     if ($client) { print $client "error: $error\n"; }
1.59      www      1192:     $server->close();
1.27      albertel 1193:     die($error);
1.23      harris41 1194: }
                   1195: 
1.63      www      1196: sub timeout {
1.165     albertel 1197:     &status("Handling Timeout");
1.190     albertel 1198:     &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
1.63      www      1199:     &catchexception('Timeout');
                   1200: }
1.22      harris41 1201: # -------------------------------- Set signal handlers to record abnormal exits
                   1202: 
                   1203: $SIG{'QUIT'}=\&catchexception;
                   1204: $SIG{__DIE__}=\&catchexception;
                   1205: 
1.81      matthew  1206: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95      harris41 1207: &status("Read loncapa.conf and loncapa_apache.conf");
                   1208: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141     foxr     1209: %perlvar=%{$perlvarref};
1.80      harris41 1210: undef $perlvarref;
1.19      www      1211: 
1.35      harris41 1212: # ----------------------------- Make sure this process is running from user=www
                   1213: my $wwwid=getpwnam('www');
                   1214: if ($wwwid!=$<) {
1.134     albertel 1215:    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   1216:    my $subj="LON: $currenthostid User ID mismatch";
1.37      harris41 1217:    system("echo 'User ID mismatch.  lond must be run as user www.' |\
1.35      harris41 1218:  mailto $emailto -s '$subj' > /dev/null");
                   1219:    exit 1;
                   1220: }
                   1221: 
1.19      www      1222: # --------------------------------------------- Check if other instance running
                   1223: 
                   1224: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
                   1225: 
                   1226: if (-e $pidfile) {
                   1227:    my $lfh=IO::File->new("$pidfile");
                   1228:    my $pide=<$lfh>;
                   1229:    chomp($pide);
1.29      harris41 1230:    if (kill 0 => $pide) { die "already running"; }
1.19      www      1231: }
1.1       albertel 1232: 
                   1233: # ------------------------------------------------------------- Read hosts file
                   1234: 
                   1235: 
                   1236: 
                   1237: # establish SERVER socket, bind and listen.
                   1238: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                   1239:                                 Type      => SOCK_STREAM,
                   1240:                                 Proto     => 'tcp',
                   1241:                                 Reuse     => 1,
                   1242:                                 Listen    => 10 )
1.29      harris41 1243:   or die "making socket: $@\n";
1.1       albertel 1244: 
                   1245: # --------------------------------------------------------- Do global variables
                   1246: 
                   1247: # global variables
                   1248: 
1.134     albertel 1249: my %children               = ();       # keys are current child process IDs
1.1       albertel 1250: 
                   1251: sub REAPER {                        # takes care of dead children
                   1252:     $SIG{CHLD} = \&REAPER;
1.165     albertel 1253:     &status("Handling child death");
1.178     foxr     1254:     my $pid;
                   1255:     do {
                   1256: 	$pid = waitpid(-1,&WNOHANG());
                   1257: 	if (defined($children{$pid})) {
                   1258: 	    &logthis("Child $pid died");
                   1259: 	    delete($children{$pid});
1.183     albertel 1260: 	} elsif ($pid > 0) {
1.178     foxr     1261: 	    &logthis("Unknown Child $pid died");
                   1262: 	}
                   1263:     } while ( $pid > 0 );
                   1264:     foreach my $child (keys(%children)) {
                   1265: 	$pid = waitpid($child,&WNOHANG());
                   1266: 	if ($pid > 0) {
                   1267: 	    &logthis("Child $child - $pid looks like we missed it's death");
                   1268: 	    delete($children{$pid});
                   1269: 	}
1.176     albertel 1270:     }
1.165     albertel 1271:     &status("Finished Handling child death");
1.1       albertel 1272: }
                   1273: 
                   1274: sub HUNTSMAN {                      # signal handler for SIGINT
1.165     albertel 1275:     &status("Killing children (INT)");
1.1       albertel 1276:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                   1277:     kill 'INT' => keys %children;
1.59      www      1278:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1       albertel 1279:     my $execdir=$perlvar{'lonDaemons'};
                   1280:     unlink("$execdir/logs/lond.pid");
1.190     albertel 1281:     &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.165     albertel 1282:     &status("Done killing children");
1.1       albertel 1283:     exit;                           # clean up with dignity
                   1284: }
                   1285: 
                   1286: sub HUPSMAN {                      # signal handler for SIGHUP
                   1287:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
1.165     albertel 1288:     &status("Killing children for restart (HUP)");
1.1       albertel 1289:     kill 'INT' => keys %children;
1.59      www      1290:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.190     albertel 1291:     &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.134     albertel 1292:     my $execdir=$perlvar{'lonDaemons'};
1.30      harris41 1293:     unlink("$execdir/logs/lond.pid");
1.165     albertel 1294:     &status("Restarting self (HUP)");
1.1       albertel 1295:     exec("$execdir/lond");         # here we go again
                   1296: }
                   1297: 
1.144     foxr     1298: #
1.148     foxr     1299: #    Kill off hashes that describe the host table prior to re-reading it.
                   1300: #    Hashes affected are:
1.200     matthew  1301: #       %hostid, %hostdom %hostip %hostdns.
1.148     foxr     1302: #
                   1303: sub KillHostHashes {
                   1304:     foreach my $key (keys %hostid) {
                   1305: 	delete $hostid{$key};
                   1306:     }
                   1307:     foreach my $key (keys %hostdom) {
                   1308: 	delete $hostdom{$key};
                   1309:     }
                   1310:     foreach my $key (keys %hostip) {
                   1311: 	delete $hostip{$key};
                   1312:     }
1.200     matthew  1313:     foreach my $key (keys %hostdns) {
                   1314: 	delete $hostdns{$key};
                   1315:     }
1.148     foxr     1316: }
                   1317: #
                   1318: #   Read in the host table from file and distribute it into the various hashes:
                   1319: #
                   1320: #    - %hostid  -  Indexed by IP, the loncapa hostname.
                   1321: #    - %hostdom -  Indexed by  loncapa hostname, the domain.
                   1322: #    - %hostip  -  Indexed by hostid, the Ip address of the host.
                   1323: sub ReadHostTable {
                   1324: 
                   1325:     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
1.200     matthew  1326:     my $myloncapaname = $perlvar{'lonHostID'};
                   1327:     Debug("My loncapa name is : $myloncapaname");
1.148     foxr     1328:     while (my $configline=<CONFIG>) {
1.178     foxr     1329: 	if (!($configline =~ /^\s*\#/)) {
                   1330: 	    my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
                   1331: 	    chomp($ip); $ip=~s/\D+$//;
1.200     matthew  1332: 	    $hostid{$ip}=$id;         # LonCAPA name of host by IP.
                   1333: 	    $hostdom{$id}=$domain;    # LonCAPA domain name of host. 
                   1334: 	    $hostip{$id}=$ip;	      # IP address of host.
                   1335: 	    $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
                   1336: 
                   1337: 	    if ($id eq $perlvar{'lonHostID'}) { 
                   1338: 		Debug("Found me in the host table: $name");
                   1339: 		$thisserver=$name; 
                   1340: 	    }
1.178     foxr     1341: 	}
1.148     foxr     1342:     }
                   1343:     close(CONFIG);
                   1344: }
                   1345: #
                   1346: #  Reload the Apache daemon's state.
1.150     foxr     1347: #  This is done by invoking /home/httpd/perl/apachereload
                   1348: #  a setuid perl script that can be root for us to do this job.
1.148     foxr     1349: #
                   1350: sub ReloadApache {
1.150     foxr     1351:     my $execdir = $perlvar{'lonDaemons'};
                   1352:     my $script  = $execdir."/apachereload";
                   1353:     system($script);
1.148     foxr     1354: }
                   1355: 
                   1356: #
1.144     foxr     1357: #   Called in response to a USR2 signal.
                   1358: #   - Reread hosts.tab
                   1359: #   - All children connected to hosts that were removed from hosts.tab
                   1360: #     are killed via SIGINT
                   1361: #   - All children connected to previously existing hosts are sent SIGUSR1
                   1362: #   - Our internal hosts hash is updated to reflect the new contents of
                   1363: #     hosts.tab causing connections from hosts added to hosts.tab to
                   1364: #     now be honored.
                   1365: #
                   1366: sub UpdateHosts {
1.165     albertel 1367:     &status("Reload hosts.tab");
1.147     foxr     1368:     logthis('<font color="blue"> Updating connections </font>');
1.148     foxr     1369:     #
                   1370:     #  The %children hash has the set of IP's we currently have children
                   1371:     #  on.  These need to be matched against records in the hosts.tab
                   1372:     #  Any ip's no longer in the table get killed off they correspond to
                   1373:     #  either dropped or changed hosts.  Note that the re-read of the table
                   1374:     #  will take care of new and changed hosts as connections come into being.
                   1375: 
                   1376: 
                   1377:     KillHostHashes;
                   1378:     ReadHostTable;
                   1379: 
                   1380:     foreach my $child (keys %children) {
                   1381: 	my $childip = $children{$child};
                   1382: 	if(!$hostid{$childip}) {
1.149     foxr     1383: 	    logthis('<font color="blue"> UpdateHosts killing child '
                   1384: 		    ." $child for ip $childip </font>");
1.148     foxr     1385: 	    kill('INT', $child);
1.149     foxr     1386: 	} else {
                   1387: 	    logthis('<font color="green"> keeping child for ip '
                   1388: 		    ." $childip (pid=$child) </font>");
1.148     foxr     1389: 	}
                   1390:     }
                   1391:     ReloadApache;
1.165     albertel 1392:     &status("Finished reloading hosts.tab");
1.144     foxr     1393: }
                   1394: 
1.148     foxr     1395: 
1.57      www      1396: sub checkchildren {
1.165     albertel 1397:     &status("Checking on the children (sending signals)");
1.57      www      1398:     &initnewstatus();
                   1399:     &logstatus();
                   1400:     &logthis('Going to check on the children');
1.134     albertel 1401:     my $docdir=$perlvar{'lonDocRoot'};
1.61      harris41 1402:     foreach (sort keys %children) {
1.57      www      1403: 	sleep 1;
                   1404:         unless (kill 'USR1' => $_) {
                   1405: 	    &logthis ('Child '.$_.' is dead');
                   1406:             &logstatus($$.' is dead');
                   1407:         } 
1.61      harris41 1408:     }
1.63      www      1409:     sleep 5;
1.113     albertel 1410:     $SIG{ALRM} = sub { die "timeout" };
                   1411:     $SIG{__DIE__} = 'DEFAULT';
1.165     albertel 1412:     &status("Checking on the children (waiting for reports)");
1.63      www      1413:     foreach (sort keys %children) {
                   1414:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.113     albertel 1415:           eval {
                   1416:             alarm(300);
1.63      www      1417: 	    &logthis('Child '.$_.' did not respond');
1.67      albertel 1418: 	    kill 9 => $_;
1.131     albertel 1419: 	    #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   1420: 	    #$subj="LON: $currenthostid killed lond process $_";
                   1421: 	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
                   1422: 	    #$execdir=$perlvar{'lonDaemons'};
                   1423: 	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
1.113     albertel 1424: 	    alarm(0);
                   1425: 	  }
1.63      www      1426:         }
                   1427:     }
1.113     albertel 1428:     $SIG{ALRM} = 'DEFAULT';
1.155     albertel 1429:     $SIG{__DIE__} = \&catchexception;
1.165     albertel 1430:     &status("Finished checking children");
1.57      www      1431: }
                   1432: 
1.1       albertel 1433: # --------------------------------------------------------------------- Logging
                   1434: 
                   1435: sub logthis {
                   1436:     my $message=shift;
                   1437:     my $execdir=$perlvar{'lonDaemons'};
                   1438:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
                   1439:     my $now=time;
                   1440:     my $local=localtime($now);
1.58      www      1441:     $lastlog=$local.': '.$message;
1.1       albertel 1442:     print $fh "$local ($$): $message\n";
                   1443: }
                   1444: 
1.77      foxr     1445: # ------------------------- Conditional log if $DEBUG true.
                   1446: sub Debug {
                   1447:     my $message = shift;
                   1448:     if($DEBUG) {
                   1449: 	&logthis($message);
                   1450:     }
                   1451: }
1.161     foxr     1452: 
                   1453: #
                   1454: #   Sub to do replies to client.. this gives a hook for some
                   1455: #   debug tracing too:
                   1456: #  Parameters:
                   1457: #     fd      - File open on client.
                   1458: #     reply   - Text to send to client.
                   1459: #     request - Original request from client.
                   1460: #
                   1461: sub Reply {
1.192     foxr     1462: 
                   1463:     my ($fd, $reply, $request) = @_;
1.161     foxr     1464: 
                   1465:     print $fd $reply;
                   1466:     Debug("Request was $request  Reply was $reply");
                   1467: 
                   1468: }
1.57      www      1469: # ------------------------------------------------------------------ Log status
                   1470: 
                   1471: sub logstatus {
1.178     foxr     1472:     &status("Doing logging");
                   1473:     my $docdir=$perlvar{'lonDocRoot'};
                   1474:     {
                   1475:     my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
1.200     matthew  1476:     print $fh $$."\t".$clientname."\t".$currenthostid."\t"
                   1477: 	.$status."\t".$lastlog."\t $keymode\n";
1.178     foxr     1478:     $fh->close();
                   1479:     }
                   1480:     &status("Finished londstatus.txt");
                   1481:     {
                   1482: 	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
1.200     matthew  1483:         print $fh $status."\n".$lastlog."\n".time."\n$keymode";
1.178     foxr     1484:         $fh->close();
                   1485:     }
                   1486:     &status("Finished logging");
1.57      www      1487: }
                   1488: 
                   1489: sub initnewstatus {
                   1490:     my $docdir=$perlvar{'lonDocRoot'};
                   1491:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
                   1492:     my $now=time;
                   1493:     my $local=localtime($now);
                   1494:     print $fh "LOND status $local - parent $$\n\n";
1.64      www      1495:     opendir(DIR,"$docdir/lon-status/londchld");
1.134     albertel 1496:     while (my $filename=readdir(DIR)) {
1.64      www      1497:         unlink("$docdir/lon-status/londchld/$filename");
                   1498:     }
                   1499:     closedir(DIR);
1.57      www      1500: }
                   1501: 
                   1502: # -------------------------------------------------------------- Status setting
                   1503: 
                   1504: sub status {
                   1505:     my $what=shift;
                   1506:     my $now=time;
                   1507:     my $local=localtime($now);
1.178     foxr     1508:     $status=$local.': '.$what;
                   1509:     $0='lond: '.$what.' '.$local;
1.57      www      1510: }
1.11      www      1511: 
                   1512: # -------------------------------------------------------- Escape Special Chars
                   1513: 
                   1514: sub escape {
                   1515:     my $str=shift;
                   1516:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
                   1517:     return $str;
                   1518: }
                   1519: 
                   1520: # ----------------------------------------------------- Un-Escape Special Chars
                   1521: 
                   1522: sub unescape {
                   1523:     my $str=shift;
                   1524:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                   1525:     return $str;
                   1526: }
                   1527: 
1.1       albertel 1528: # ----------------------------------------------------------- Send USR1 to lonc
                   1529: 
                   1530: sub reconlonc {
                   1531:     my $peerfile=shift;
                   1532:     &logthis("Trying to reconnect for $peerfile");
                   1533:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
                   1534:     if (my $fh=IO::File->new("$loncfile")) {
                   1535: 	my $loncpid=<$fh>;
                   1536:         chomp($loncpid);
                   1537:         if (kill 0 => $loncpid) {
                   1538: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
                   1539:             kill USR1 => $loncpid;
                   1540:         } else {
1.9       www      1541: 	    &logthis(
1.190     albertel 1542:               "<font color='red'>CRITICAL: "
1.9       www      1543:              ."lonc at pid $loncpid not responding, giving up</font>");
1.1       albertel 1544:         }
                   1545:     } else {
1.190     albertel 1546:       &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
1.1       albertel 1547:     }
                   1548: }
                   1549: 
                   1550: # -------------------------------------------------- Non-critical communication
1.11      www      1551: 
1.1       albertel 1552: sub subreply {
                   1553:     my ($cmd,$server)=@_;
                   1554:     my $peerfile="$perlvar{'lonSockDir'}/$server";
                   1555:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   1556:                                       Type    => SOCK_STREAM,
                   1557:                                       Timeout => 10)
                   1558:        or return "con_lost";
                   1559:     print $sclient "$cmd\n";
                   1560:     my $answer=<$sclient>;
                   1561:     chomp($answer);
                   1562:     if (!$answer) { $answer="con_lost"; }
                   1563:     return $answer;
                   1564: }
                   1565: 
                   1566: sub reply {
                   1567:   my ($cmd,$server)=@_;
                   1568:   my $answer;
1.115     albertel 1569:   if ($server ne $currenthostid) { 
1.1       albertel 1570:     $answer=subreply($cmd,$server);
                   1571:     if ($answer eq 'con_lost') {
                   1572: 	$answer=subreply("ping",$server);
                   1573:         if ($answer ne $server) {
1.115     albertel 1574: 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
1.1       albertel 1575:            &reconlonc("$perlvar{'lonSockDir'}/$server");
                   1576:         }
                   1577:         $answer=subreply($cmd,$server);
                   1578:     }
                   1579:   } else {
                   1580:     $answer='self_reply';
                   1581:   } 
                   1582:   return $answer;
                   1583: }
                   1584: 
1.13      www      1585: # -------------------------------------------------------------- Talk to lonsql
                   1586: 
1.12      harris41 1587: sub sqlreply {
                   1588:     my ($cmd)=@_;
                   1589:     my $answer=subsqlreply($cmd);
                   1590:     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
                   1591:     return $answer;
                   1592: }
                   1593: 
                   1594: sub subsqlreply {
                   1595:     my ($cmd)=@_;
                   1596:     my $unixsock="mysqlsock";
                   1597:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
                   1598:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   1599:                                       Type    => SOCK_STREAM,
                   1600:                                       Timeout => 10)
                   1601:        or return "con_lost";
                   1602:     print $sclient "$cmd\n";
                   1603:     my $answer=<$sclient>;
                   1604:     chomp($answer);
                   1605:     if (!$answer) { $answer="con_lost"; }
                   1606:     return $answer;
                   1607: }
                   1608: 
1.1       albertel 1609: # -------------------------------------------- Return path to profile directory
1.11      www      1610: 
1.1       albertel 1611: sub propath {
                   1612:     my ($udom,$uname)=@_;
                   1613:     $udom=~s/\W//g;
                   1614:     $uname=~s/\W//g;
1.16      www      1615:     my $subdir=$uname.'__';
1.1       albertel 1616:     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
                   1617:     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
                   1618:     return $proname;
                   1619: } 
                   1620: 
                   1621: # --------------------------------------- Is this the home server of an author?
1.11      www      1622: 
1.1       albertel 1623: sub ishome {
                   1624:     my $author=shift;
                   1625:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                   1626:     my ($udom,$uname)=split(/\//,$author);
                   1627:     my $proname=propath($udom,$uname);
                   1628:     if (-e $proname) {
                   1629: 	return 'owner';
                   1630:     } else {
                   1631:         return 'not_owner';
                   1632:     }
                   1633: }
                   1634: 
                   1635: # ======================================================= Continue main program
                   1636: # ---------------------------------------------------- Fork once and dissociate
                   1637: 
1.134     albertel 1638: my $fpid=fork;
1.1       albertel 1639: exit if $fpid;
1.29      harris41 1640: die "Couldn't fork: $!" unless defined ($fpid);
1.1       albertel 1641: 
1.29      harris41 1642: POSIX::setsid() or die "Can't start new session: $!";
1.1       albertel 1643: 
                   1644: # ------------------------------------------------------- Write our PID on disk
                   1645: 
1.134     albertel 1646: my $execdir=$perlvar{'lonDaemons'};
1.1       albertel 1647: open (PIDSAVE,">$execdir/logs/lond.pid");
                   1648: print PIDSAVE "$$\n";
                   1649: close(PIDSAVE);
1.190     albertel 1650: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.57      www      1651: &status('Starting');
1.1       albertel 1652: 
1.106     foxr     1653: 
1.1       albertel 1654: 
                   1655: # ----------------------------------------------------- Install signal handlers
                   1656: 
1.57      www      1657: 
1.1       albertel 1658: $SIG{CHLD} = \&REAPER;
                   1659: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   1660: $SIG{HUP}  = \&HUPSMAN;
1.57      www      1661: $SIG{USR1} = \&checkchildren;
1.144     foxr     1662: $SIG{USR2} = \&UpdateHosts;
1.106     foxr     1663: 
1.148     foxr     1664: #  Read the host hashes:
                   1665: 
                   1666: ReadHostTable;
1.106     foxr     1667: 
                   1668: # --------------------------------------------------------------
                   1669: #   Accept connections.  When a connection comes in, it is validated
                   1670: #   and if good, a child process is created to process transactions
                   1671: #   along the connection.
                   1672: 
1.1       albertel 1673: while (1) {
1.165     albertel 1674:     &status('Starting accept');
1.106     foxr     1675:     $client = $server->accept() or next;
1.165     albertel 1676:     &status('Accepted '.$client.' off to spawn');
1.106     foxr     1677:     make_new_child($client);
1.165     albertel 1678:     &status('Finished spawning');
1.1       albertel 1679: }
                   1680: 
                   1681: sub make_new_child {
                   1682:     my $pid;
1.207   ! foxr     1683: #    my $cipher;     # Now global
1.1       albertel 1684:     my $sigset;
1.106     foxr     1685: 
                   1686:     $client = shift;
1.165     albertel 1687:     &status('Starting new child '.$client);
1.161     foxr     1688:     &logthis('<font color="green"> Attempting to start child ('.$client.
                   1689: 	     ")</font>");    
1.1       albertel 1690:     # block signal for fork
                   1691:     $sigset = POSIX::SigSet->new(SIGINT);
                   1692:     sigprocmask(SIG_BLOCK, $sigset)
1.29      harris41 1693:         or die "Can't block SIGINT for fork: $!\n";
1.134     albertel 1694: 
1.29      harris41 1695:     die "fork: $!" unless defined ($pid = fork);
1.148     foxr     1696: 
                   1697:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                   1698: 	                               # connection liveness.
                   1699: 
                   1700:     #
                   1701:     #  Figure out who we're talking to so we can record the peer in 
                   1702:     #  the pid hash.
                   1703:     #
                   1704:     my $caller = getpeername($client);
1.180     albertel 1705:     my ($port,$iaddr);
                   1706:     if (defined($caller) && length($caller) > 0) {
                   1707: 	($port,$iaddr)=unpack_sockaddr_in($caller);
                   1708:     } else {
                   1709: 	&logthis("Unable to determine who caller was, getpeername returned nothing");
                   1710:     }
                   1711:     if (defined($iaddr)) {
1.200     matthew  1712: 	$clientip  = inet_ntoa($iaddr);
                   1713: 	Debug("Connected with $clientip");
                   1714: 	$clientdns = gethostbyaddr($iaddr, AF_INET);
                   1715: 	Debug("Connected with $clientdns by name");
1.180     albertel 1716:     } else {
1.200     matthew  1717: 	&logthis("Unable to determine clientip");
1.180     albertel 1718: 	$clientip='Unavailable';
                   1719:     }
1.1       albertel 1720:     
                   1721:     if ($pid) {
                   1722:         # Parent records the child's birth and returns.
                   1723:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 1724:             or die "Can't unblock SIGINT for fork: $!\n";
1.148     foxr     1725:         $children{$pid} = $clientip;
1.57      www      1726:         &status('Started child '.$pid);
1.1       albertel 1727:         return;
                   1728:     } else {
                   1729:         # Child can *not* return from this subroutine.
                   1730:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
1.126     albertel 1731:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
                   1732:                                 #don't get intercepted
1.57      www      1733:         $SIG{USR1}= \&logstatus;
1.63      www      1734:         $SIG{ALRM}= \&timeout;
1.57      www      1735:         $lastlog='Forked ';
                   1736:         $status='Forked';
                   1737: 
1.1       albertel 1738:         # unblock signals
                   1739:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 1740:             or die "Can't unblock SIGINT for fork: $!\n";
1.13      www      1741: 
1.207   ! foxr     1742: #        my $tmpsnum=0;            # Now global
1.178     foxr     1743: #---------------------------------------------------- kerberos 5 initialization
1.91      albertel 1744:         &Authen::Krb5::init_context();
                   1745:         &Authen::Krb5::init_ets();
                   1746: 
1.161     foxr     1747: 	&status('Accepted connection');
1.1       albertel 1748: # =============================================================================
                   1749:             # do something with the connection
                   1750: # -----------------------------------------------------------------------------
1.200     matthew  1751: 	# see if we know client and 'check' for spoof IP by ineffective challenge
1.148     foxr     1752: 
1.161     foxr     1753: 	ReadManagerTable;	# May also be a manager!!
                   1754: 	
                   1755: 	my $clientrec=($hostid{$clientip}     ne undef);
                   1756: 	my $ismanager=($managers{$clientip}    ne undef);
                   1757: 	$clientname  = "[unknonwn]";
                   1758: 	if($clientrec) {	# Establish client type.
                   1759: 	    $ConnectionType = "client";
                   1760: 	    $clientname = $hostid{$clientip};
                   1761: 	    if($ismanager) {
                   1762: 		$ConnectionType = "both";
                   1763: 	    }
                   1764: 	} else {
                   1765: 	    $ConnectionType = "manager";
                   1766: 	    $clientname = $managers{$clientip};
                   1767: 	}
                   1768: 	my $clientok;
1.200     matthew  1769: 
1.161     foxr     1770: 	if ($clientrec || $ismanager) {
                   1771: 	    &status("Waiting for init from $clientip $clientname");
                   1772: 	    &logthis('<font color="yellow">INFO: Connection, '.
                   1773: 		     $clientip.
                   1774: 		  " ($clientname) connection type = $ConnectionType </font>" );
                   1775: 	    &status("Connecting $clientip  ($clientname))"); 
                   1776: 	    my $remotereq=<$client>;
1.200     matthew  1777: 	    chomp($remotereq);
                   1778: 	    Debug("Got init: $remotereq");
                   1779: 	    my $inikeyword = split(/:/, $remotereq);
1.161     foxr     1780: 	    if ($remotereq =~ /^init/) {
                   1781: 		&sethost("sethost:$perlvar{'lonHostID'}");
1.200     matthew  1782: 		#
                   1783: 		#  If the remote is attempting a local init... give that a try:
                   1784: 		#
                   1785: 		my ($i, $inittype) = split(/:/, $remotereq);
                   1786: 
                   1787: 		# If the connection type is ssl, but I didn't get my
                   1788: 		# certificate files yet, then I'll drop  back to 
                   1789: 		# insecure (if allowed).
                   1790: 		
                   1791: 		if($inittype eq "ssl") {
                   1792: 		    my ($ca, $cert) = lonssl::CertificateFile;
                   1793: 		    my $kfile       = lonssl::KeyFile;
                   1794: 		    if((!$ca)   || 
                   1795: 		       (!$cert) || 
                   1796: 		       (!$kfile)) {
                   1797: 			$inittype = ""; # This forces insecure attempt.
                   1798: 			&logthis("<font color=\"blue\"> Certificates not "
                   1799: 				 ."installed -- trying insecure auth</font>");
                   1800: 		    }
                   1801: 		    else {	# SSL certificates are in place so
                   1802: 		    }		# Leave the inittype alone.
                   1803: 		}
                   1804: 
                   1805: 		if($inittype eq "local") {
                   1806: 		    my $key = LocalConnection($client, $remotereq);
                   1807: 		    if($key) {
                   1808: 			Debug("Got local key $key");
                   1809: 			$clientok     = 1;
                   1810: 			my $cipherkey = pack("H32", $key);
                   1811: 			$cipher       = new IDEA($cipherkey);
                   1812: 			print $client "ok:local\n";
                   1813: 			&logthis('<font color="green"'
                   1814: 				 . "Successful local authentication </font>");
                   1815: 			$keymode = "local"
                   1816: 		    } else {
                   1817: 			Debug("Failed to get local key");
                   1818: 			$clientok = 0;
                   1819: 			shutdown($client, 3);
                   1820: 			close $client;
                   1821: 		    }
                   1822: 		} elsif ($inittype eq "ssl") {
                   1823: 		    my $key = SSLConnection($client);
                   1824: 		    if ($key) {
                   1825: 			$clientok = 1;
                   1826: 			my $cipherkey = pack("H32", $key);
                   1827: 			$cipher       = new IDEA($cipherkey);
                   1828: 			&logthis('<font color="green">'
                   1829: 				 ."Successfull ssl authentication with $clientname </font>");
                   1830: 			$keymode = "ssl";
                   1831: 	     
                   1832: 		    } else {
                   1833: 			$clientok = 0;
                   1834: 			close $client;
                   1835: 		    }
                   1836: 	   
1.161     foxr     1837: 		} else {
1.200     matthew  1838: 		    my $ok = InsecureConnection($client);
                   1839: 		    if($ok) {
                   1840: 			$clientok = 1;
                   1841: 			&logthis('<font color="green">'
                   1842: 				 ."Successful insecure authentication with $clientname </font>");
                   1843: 			print $client "ok\n";
                   1844: 			$keymode = "insecure";
                   1845: 		    } else {
                   1846: 			&logthis('<font color="yellow">'
                   1847: 				  ."Attempted insecure connection disallowed </font>");
                   1848: 			close $client;
                   1849: 			$clientok = 0;
                   1850: 			
                   1851: 		    }
1.161     foxr     1852: 		}
1.2       www      1853: 	    } else {
1.161     foxr     1854: 		&logthis(
1.190     albertel 1855: 			 "<font color='blue'>WARNING: "
1.161     foxr     1856: 			 ."$clientip failed to initialize: >$remotereq< </font>");
                   1857: 		&status('No init '.$clientip);
                   1858: 	    }
1.200     matthew  1859: 	    
1.161     foxr     1860: 	} else {
                   1861: 	    &logthis(
1.190     albertel 1862: 		     "<font color='blue'>WARNING: Unknown client $clientip</font>");
1.161     foxr     1863: 	    &status('Hung up on '.$clientip);
                   1864: 	}
1.200     matthew  1865:  
1.161     foxr     1866: 	if ($clientok) {
1.1       albertel 1867: # ---------------- New known client connecting, could mean machine online again
1.161     foxr     1868: 	    
                   1869: 	    foreach my $id (keys(%hostip)) {
                   1870: 		if ($hostip{$id} ne $clientip ||
                   1871: 		    $hostip{$currenthostid} eq $clientip) {
                   1872: 		    # no need to try to do recon's to myself
                   1873: 		    next;
1.115     albertel 1874: 		}
1.161     foxr     1875: 		&reconlonc("$perlvar{'lonSockDir'}/$id");
                   1876: 	    }
1.190     albertel 1877: 	    &logthis("<font color='green'>Established connection: $clientname</font>");
1.161     foxr     1878: 	    &status('Will listen to '.$clientname);
1.178     foxr     1879: # ------------------------------------------------------------ Process requests
                   1880: 	    while (my $userinput=<$client>) {
                   1881:                 chomp($userinput);
                   1882: 		Debug("Request = $userinput\n");
                   1883:                 &status('Processing '.$clientname.': '.$userinput);
                   1884:                 my $wasenc=0;
                   1885:                 alarm(120);
                   1886: # ------------------------------------------------------------ See if encrypted
                   1887: 		if ($userinput =~ /^enc/) {
                   1888: 		    if ($cipher) {
                   1889: 			my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
                   1890: 			$userinput='';
                   1891: 			for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
                   1892: 			    $userinput.=
                   1893: 				$cipher->decrypt(
                   1894: 						 pack("H16",substr($encinput,$encidx,16))
                   1895: 						 );
                   1896: 			}
                   1897: 			$userinput=substr($userinput,0,$cmdlength);
                   1898: 			$wasenc=1;
                   1899: 		    }
                   1900: 		}
                   1901: 		
                   1902: # ------------------------------------------------------------- Normal commands
                   1903: # ------------------------------------------------------------------------ ping
                   1904: 		if ($userinput =~ /^ping/) {	# client only
                   1905: 		    if(isClient) {
                   1906: 			print $client "$currenthostid\n";
                   1907: 		    } else {
                   1908: 			Reply($client, "refused\n", $userinput);
                   1909: 		    }
                   1910: # ------------------------------------------------------------------------ pong
                   1911: 		}elsif ($userinput =~ /^pong/) { # client only
                   1912: 		    if(isClient) {
                   1913: 			my $reply=&reply("ping",$clientname);
                   1914: 			print $client "$currenthostid:$reply\n"; 
                   1915: 		    } else {
                   1916: 			Reply($client, "refused\n", $userinput);
                   1917: 		    }
                   1918: # ------------------------------------------------------------------------ ekey
                   1919: 		} elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs
                   1920: 		    my $buildkey=time.$$.int(rand 100000);
                   1921: 		    $buildkey=~tr/1-6/A-F/;
                   1922: 		    $buildkey=int(rand 100000).$buildkey.int(rand 100000);
                   1923: 		    my $key=$currenthostid.$clientname;
                   1924: 		    $key=~tr/a-z/A-Z/;
                   1925: 		    $key=~tr/G-P/0-9/;
                   1926: 		    $key=~tr/Q-Z/0-9/;
                   1927: 		    $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
                   1928: 		    $key=substr($key,0,32);
                   1929: 		    my $cipherkey=pack("H32",$key);
                   1930: 		    $cipher=new IDEA $cipherkey;
                   1931: 		    print $client "$buildkey\n"; 
                   1932: # ------------------------------------------------------------------------ load
                   1933: 		} elsif ($userinput =~ /^load/) { # client only
                   1934: 		    if (isClient) {
                   1935: 			my $loadavg;
                   1936: 			{
                   1937: 			    my $loadfile=IO::File->new('/proc/loadavg');
                   1938: 			    $loadavg=<$loadfile>;
                   1939: 			}
                   1940: 			$loadavg =~ s/\s.*//g;
                   1941: 			my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
                   1942: 			print $client "$loadpercent\n";
                   1943: 		    } else {
                   1944: 			Reply($client, "refused\n", $userinput);
                   1945: 	       
                   1946: 		    }
                   1947: # -------------------------------------------------------------------- userload
                   1948: 		} elsif ($userinput =~ /^userload/) { # client only
                   1949: 		    if(isClient) {
                   1950: 			my $userloadpercent=&userload();
                   1951: 			print $client "$userloadpercent\n";
                   1952: 		    } else {
                   1953: 			Reply($client, "refused\n", $userinput);
                   1954: 		     
                   1955: 		    }
                   1956: #
                   1957: #        Transactions requiring encryption:
                   1958: #
                   1959: # ----------------------------------------------------------------- currentauth
                   1960: 		} elsif ($userinput =~ /^currentauth/) {
                   1961: 		    if (($wasenc==1)  && isClient) { # Encoded & client only.
                   1962: 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
                   1963: 			my $result = GetAuthType($udom, $uname);
                   1964: 			if($result eq "nouser") {
                   1965: 			    print $client "unknown_user\n";
                   1966: 			}
                   1967: 			else {
                   1968: 			    print $client "$result\n"
                   1969: 			    }
                   1970: 		    } else {
                   1971: 			Reply($client, "refused\n", $userinput);
                   1972: 			
                   1973: 		    }
                   1974: #--------------------------------------------------------------------- pushfile
                   1975: 		} elsif($userinput =~ /^pushfile/) {	# encoded & manager.
                   1976: 		    if(($wasenc == 1) && isManager) {
                   1977: 			my $cert = GetCertificate($userinput);
                   1978: 			if(ValidManager($cert)) {
                   1979: 			    my $reply = PushFile($userinput);
                   1980: 			    print $client "$reply\n";
                   1981: 			} else {
                   1982: 			    print $client "refused\n";
                   1983: 			} 
                   1984: 		    } else {
                   1985: 			Reply($client, "refused\n", $userinput);
                   1986: 			
                   1987: 		    }
                   1988: #--------------------------------------------------------------------- reinit
                   1989: 		} elsif($userinput =~ /^reinit/) { # Encoded and manager
                   1990: 			if (($wasenc == 1) && isManager) {
                   1991: 				my $cert = GetCertificate($userinput);
                   1992: 				if(ValidManager($cert)) {
                   1993: 					chomp($userinput);
                   1994: 					my $reply = ReinitProcess($userinput);
                   1995: 					print $client  "$reply\n";
                   1996: 				} else {
                   1997: 					 print $client "refused\n";
                   1998: 				}
                   1999: 			} else {
                   2000: 				Reply($client, "refused\n", $userinput);
                   2001: 			}
                   2002: #------------------------------------------------------------------------- edit
                   2003: 		    } elsif ($userinput =~ /^edit/) {    # encoded and manager:
                   2004: 			if(($wasenc ==1) && (isManager)) {
                   2005: 			    my $cert = GetCertificate($userinput);
                   2006: 			    if(ValidManager($cert)) {
                   2007:                my($command, $filetype, $script) = split(/:/, $userinput);
                   2008:                if (($filetype eq "hosts") || ($filetype eq "domain")) {
                   2009:                   if($script ne "") {
                   2010: 		      Reply($client, EditFile($userinput));
                   2011:                   } else {
                   2012:                      Reply($client,"refused\n",$userinput);
                   2013:                   }
                   2014:                } else {
                   2015:                   Reply($client,"refused\n",$userinput);
                   2016:                }
                   2017:             } else {
                   2018:                Reply($client,"refused\n",$userinput);
                   2019:             }
                   2020:          } else {
                   2021: 	     Reply($client,"refused\n",$userinput);
                   2022: 	 }
                   2023: # ------------------------------------------------------------------------ auth
                   2024: 		    } elsif ($userinput =~ /^auth/) { # Encoded and client only.
                   2025: 		    if (($wasenc==1) && isClient) {
                   2026: 			my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
                   2027: 			chomp($upass);
                   2028: 			$upass=unescape($upass);
                   2029: 			my $proname=propath($udom,$uname);
                   2030: 			my $passfilename="$proname/passwd";
                   2031: 			if (-e $passfilename) {
                   2032: 			    my $pf = IO::File->new($passfilename);
                   2033: 			    my $realpasswd=<$pf>;
                   2034: 			    chomp($realpasswd);
                   2035: 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   2036: 			    my $pwdcorrect=0;
                   2037: 			    if ($howpwd eq 'internal') {
                   2038: 				&Debug("Internal auth");
                   2039: 				$pwdcorrect=
                   2040: 				    (crypt($upass,$contentpwd) eq $contentpwd);
                   2041: 			    } elsif ($howpwd eq 'unix') {
                   2042: 				&Debug("Unix auth");
                   2043: 				if((getpwnam($uname))[1] eq "") { #no such user!
                   2044: 				    $pwdcorrect = 0;
                   2045: 				} else {
                   2046: 				    $contentpwd=(getpwnam($uname))[1];
                   2047: 				    my $pwauth_path="/usr/local/sbin/pwauth";
                   2048: 				    unless ($contentpwd eq 'x') {
                   2049: 					$pwdcorrect=
                   2050: 					    (crypt($upass,$contentpwd) eq 
                   2051: 					     $contentpwd);
                   2052: 				    }
                   2053: 				    
                   2054: 				    elsif (-e $pwauth_path) {
                   2055: 					open PWAUTH, "|$pwauth_path" or
                   2056: 					    die "Cannot invoke authentication";
                   2057: 					print PWAUTH "$uname\n$upass\n";
                   2058: 					close PWAUTH;
                   2059: 					$pwdcorrect=!$?;
                   2060: 				    }
                   2061: 				}
                   2062: 			    } elsif ($howpwd eq 'krb4') {
                   2063: 				my $null=pack("C",0);
                   2064: 				unless ($upass=~/$null/) {
                   2065: 				    my $krb4_error = &Authen::Krb4::get_pw_in_tkt
                   2066: 					($uname,"",$contentpwd,'krbtgt',
                   2067: 					 $contentpwd,1,$upass);
                   2068: 				    if (!$krb4_error) {
                   2069: 					$pwdcorrect = 1;
                   2070: 				    } else { 
                   2071: 					$pwdcorrect=0; 
                   2072: 					# log error if it is not a bad password
                   2073: 					if ($krb4_error != 62) {
1.191     albertel 2074: 					    &logthis('krb4:'.$uname.','.
1.178     foxr     2075: 						     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
                   2076: 					}
                   2077: 				    }
                   2078: 				}
                   2079: 			    } elsif ($howpwd eq 'krb5') {
                   2080: 				my $null=pack("C",0);
                   2081: 				unless ($upass=~/$null/) {
                   2082: 				    my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
                   2083: 				    my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
                   2084: 				    my $krbserver=&Authen::Krb5::parse_name($krbservice);
                   2085: 				    my $credentials=&Authen::Krb5::cc_default();
                   2086: 				    $credentials->initialize($krbclient);
                   2087: 				    my $krbreturn = 
                   2088: 					&Authen::Krb5::get_in_tkt_with_password(
                   2089: 										$krbclient,$krbserver,$upass,$credentials);
                   2090: #				  unless ($krbreturn) {
                   2091: #				      &logthis("Krb5 Error: ".
                   2092: #					       &Authen::Krb5::error());
                   2093: #				  }
                   2094: 				    $pwdcorrect = ($krbreturn == 1);
                   2095: 				} else { $pwdcorrect=0; }
                   2096: 			    } elsif ($howpwd eq 'localauth') {
                   2097: 				$pwdcorrect=&localauth::localauth($uname,$upass,
                   2098: 								  $contentpwd);
                   2099: 			    }
                   2100: 			    if ($pwdcorrect) {
                   2101: 				print $client "authorized\n";
                   2102: 			    } else {
                   2103: 				print $client "non_authorized\n";
                   2104: 			    }  
                   2105: 			} else {
                   2106: 			    print $client "unknown_user\n";
                   2107: 			}
                   2108: 		    } else {
                   2109: 			Reply($client, "refused\n", $userinput);
                   2110: 		       
                   2111: 		    }
                   2112: # ---------------------------------------------------------------------- passwd
                   2113: 		} elsif ($userinput =~ /^passwd/) { # encoded and client
                   2114: 		    if (($wasenc==1) && isClient) {
                   2115: 			my 
                   2116: 			    ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
                   2117: 			chomp($npass);
                   2118: 			$upass=&unescape($upass);
                   2119: 			$npass=&unescape($npass);
                   2120: 			&Debug("Trying to change password for $uname");
                   2121: 			my $proname=propath($udom,$uname);
                   2122: 			my $passfilename="$proname/passwd";
                   2123: 			if (-e $passfilename) {
                   2124: 			    my $realpasswd;
                   2125: 			    { my $pf = IO::File->new($passfilename);
                   2126: 			      $realpasswd=<$pf>; }
                   2127: 			    chomp($realpasswd);
                   2128: 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   2129: 			    if ($howpwd eq 'internal') {
                   2130: 				&Debug("internal auth");
                   2131: 				if (crypt($upass,$contentpwd) eq $contentpwd) {
                   2132: 				    my $salt=time;
                   2133: 				    $salt=substr($salt,6,2);
                   2134: 				    my $ncpass=crypt($npass,$salt);
                   2135: 				    {
                   2136: 					my $pf;
                   2137: 					if ($pf = IO::File->new(">$passfilename")) {
                   2138: 					    print $pf "internal:$ncpass\n";
                   2139: 					    &logthis("Result of password change for $uname: pwchange_success");
                   2140: 					    print $client "ok\n";
                   2141: 					} else {
                   2142: 					    &logthis("Unable to open $uname passwd to change password");
                   2143: 					    print $client "non_authorized\n";
                   2144: 					}
                   2145: 				    }             
                   2146: 				    
                   2147: 				} else {
                   2148: 				    print $client "non_authorized\n";
                   2149: 				}
                   2150: 			    } elsif ($howpwd eq 'unix') {
                   2151: 				# Unix means we have to access /etc/password
                   2152: 				# one way or another.
                   2153: 				# First: Make sure the current password is
                   2154: 				#        correct
                   2155: 				&Debug("auth is unix");
                   2156: 				$contentpwd=(getpwnam($uname))[1];
                   2157: 				my $pwdcorrect = "0";
                   2158: 				my $pwauth_path="/usr/local/sbin/pwauth";
                   2159: 				unless ($contentpwd eq 'x') {
                   2160: 				    $pwdcorrect=
                   2161: 					(crypt($upass,$contentpwd) eq $contentpwd);
                   2162: 				} elsif (-e $pwauth_path) {
                   2163: 				    open PWAUTH, "|$pwauth_path" or
                   2164: 					die "Cannot invoke authentication";
                   2165: 				    print PWAUTH "$uname\n$upass\n";
                   2166: 				    close PWAUTH;
                   2167: 				    &Debug("exited pwauth with $? ($uname,$upass) ");
                   2168: 				    $pwdcorrect=($? == 0);
                   2169: 				}
                   2170: 				if ($pwdcorrect) {
                   2171: 				    my $execdir=$perlvar{'lonDaemons'};
                   2172: 				    &Debug("Opening lcpasswd pipeline");
                   2173: 				    my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
                   2174: 				    print $pf "$uname\n$npass\n$npass\n";
                   2175: 				    close $pf;
                   2176: 				    my $err = $?;
                   2177: 				    my $result = ($err>0 ? 'pwchange_failure' 
                   2178: 						  : 'ok');
                   2179: 				    &logthis("Result of password change for $uname: ".
                   2180: 					     &lcpasswdstrerror($?));
                   2181: 				    print $client "$result\n";
                   2182: 				} else {
                   2183: 				    print $client "non_authorized\n";
                   2184: 				}
                   2185: 			    } else {
                   2186: 				print $client "auth_mode_error\n";
                   2187: 			    }  
                   2188: 			} else {
                   2189: 			    print $client "unknown_user\n";
                   2190: 			}
                   2191: 		    } else {
                   2192: 			Reply($client, "refused\n", $userinput);
                   2193: 		       
                   2194: 		    }
                   2195: # -------------------------------------------------------------------- makeuser
                   2196: 		} elsif ($userinput =~ /^makeuser/) { # encoded and client.
                   2197: 		    &Debug("Make user received");
                   2198: 		    my $oldumask=umask(0077);
                   2199: 		    if (($wasenc==1) && isClient) {
                   2200: 			my 
                   2201: 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
                   2202: 			&Debug("cmd =".$cmd." $udom =".$udom.
                   2203: 			       " uname=".$uname);
                   2204: 			chomp($npass);
                   2205: 			$npass=&unescape($npass);
                   2206: 			my $proname=propath($udom,$uname);
                   2207: 			my $passfilename="$proname/passwd";
                   2208: 			&Debug("Password file created will be:".
                   2209: 			       $passfilename);
                   2210: 			if (-e $passfilename) {
                   2211: 			    print $client "already_exists\n";
                   2212: 			} elsif ($udom ne $currentdomainid) {
                   2213: 			    print $client "not_right_domain\n";
                   2214: 			} else {
                   2215: 			    my @fpparts=split(/\//,$proname);
                   2216: 			    my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
                   2217: 			    my $fperror='';
                   2218: 			    for (my $i=3;$i<=$#fpparts;$i++) {
                   2219: 				$fpnow.='/'.$fpparts[$i]; 
                   2220: 				unless (-e $fpnow) {
                   2221: 				    unless (mkdir($fpnow,0777)) {
                   2222: 					$fperror="error: ".($!+0)
                   2223: 					    ." mkdir failed while attempting "
                   2224: 					    ."makeuser";
                   2225: 				    }
                   2226: 				}
                   2227: 			    }
                   2228: 			    unless ($fperror) {
                   2229: 				my $result=&make_passwd_file($uname, $umode,$npass,
                   2230: 							     $passfilename);
                   2231: 				print $client $result;
                   2232: 			    } else {
                   2233: 				print $client "$fperror\n";
                   2234: 			    }
                   2235: 			}
                   2236: 		    } else {
                   2237: 			Reply($client, "refused\n", $userinput);
                   2238: 	      
                   2239: 		    }
                   2240: 		    umask($oldumask);
                   2241: # -------------------------------------------------------------- changeuserauth
                   2242: 		} elsif ($userinput =~ /^changeuserauth/) { # encoded & client
                   2243: 		    &Debug("Changing authorization");
                   2244: 		    if (($wasenc==1) && isClient) {
                   2245: 			my 
                   2246: 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
                   2247: 			chomp($npass);
                   2248: 			&Debug("cmd = ".$cmd." domain= ".$udom.
                   2249: 			       "uname =".$uname." umode= ".$umode);
                   2250: 			$npass=&unescape($npass);
                   2251: 			my $proname=&propath($udom,$uname);
                   2252: 			my $passfilename="$proname/passwd";
                   2253: 			if ($udom ne $currentdomainid) {
                   2254: 			    print $client "not_right_domain\n";
                   2255: 			} else {
                   2256: 			    my $result=&make_passwd_file($uname, $umode,$npass,
                   2257: 							 $passfilename);
                   2258: 			    print $client $result;
                   2259: 			}
                   2260: 		    } else {
                   2261: 			Reply($client, "refused\n", $userinput);
                   2262: 		   
                   2263: 		    }
                   2264: # ------------------------------------------------------------------------ home
                   2265: 		} elsif ($userinput =~ /^home/) { # client clear or encoded
                   2266: 		    if(isClient) {
                   2267: 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
                   2268: 			chomp($uname);
                   2269: 			my $proname=propath($udom,$uname);
                   2270: 			if (-e $proname) {
                   2271: 			    print $client "found\n";
                   2272: 			} else {
                   2273: 			    print $client "not_found\n";
                   2274: 			}
                   2275: 		    } else {
                   2276: 			Reply($client, "refused\n", $userinput);
                   2277: 
                   2278: 		    }
                   2279: # ---------------------------------------------------------------------- update
                   2280: 		} elsif ($userinput =~ /^update/) { # client clear or encoded.
                   2281: 		    if(isClient) {
                   2282: 			my ($cmd,$fname)=split(/:/,$userinput);
                   2283: 			my $ownership=ishome($fname);
                   2284: 			if ($ownership eq 'not_owner') {
                   2285: 			    if (-e $fname) {
                   2286: 				my ($dev,$ino,$mode,$nlink,
                   2287: 				    $uid,$gid,$rdev,$size,
                   2288: 				    $atime,$mtime,$ctime,
                   2289: 				    $blksize,$blocks)=stat($fname);
                   2290: 				my $now=time;
                   2291: 				my $since=$now-$atime;
                   2292: 				if ($since>$perlvar{'lonExpire'}) {
                   2293: 				    my $reply=
                   2294: 					&reply("unsub:$fname","$clientname");
                   2295: 				    unlink("$fname");
                   2296: 				} else {
                   2297: 				    my $transname="$fname.in.transfer";
                   2298: 				    my $remoteurl=
                   2299: 					&reply("sub:$fname","$clientname");
                   2300: 				    my $response;
                   2301: 				    {
                   2302: 					my $ua=new LWP::UserAgent;
                   2303: 					my $request=new HTTP::Request('GET',"$remoteurl");
                   2304: 					$response=$ua->request($request,$transname);
                   2305: 				    }
                   2306: 				    if ($response->is_error()) {
                   2307: 					unlink($transname);
                   2308: 					my $message=$response->status_line;
                   2309: 					&logthis(
                   2310: 						 "LWP GET: $message for $fname ($remoteurl)");
                   2311: 				    } else {
                   2312: 					if ($remoteurl!~/\.meta$/) {
                   2313: 					    my $ua=new LWP::UserAgent;
                   2314: 					    my $mrequest=
                   2315: 						new HTTP::Request('GET',$remoteurl.'.meta');
                   2316: 					    my $mresponse=
                   2317: 						$ua->request($mrequest,$fname.'.meta');
                   2318: 					    if ($mresponse->is_error()) {
                   2319: 						unlink($fname.'.meta');
                   2320: 					    }
                   2321: 					}
                   2322: 					rename($transname,$fname);
                   2323: 				    }
                   2324: 				}
                   2325: 				print $client "ok\n";
                   2326: 			    } else {
                   2327: 				print $client "not_found\n";
                   2328: 			    }
                   2329: 			} else {
                   2330: 			    print $client "rejected\n";
                   2331: 			}
                   2332: 		    } else {
                   2333: 			Reply($client, "refused\n", $userinput);
                   2334: 
                   2335: 		    }
                   2336: # -------------------------------------- fetch a user file from a remote server
                   2337: 		} elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
                   2338: 		    if(isClient) {
1.184     raeburn  2339: 			my ($cmd,$fname)=split(/:/,$userinput);
1.185     albertel 2340: 			my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
1.178     foxr     2341: 			my $udir=propath($udom,$uname).'/userfiles';
                   2342: 			unless (-e $udir) { mkdir($udir,0770); }
                   2343: 			if (-e $udir) {
1.184     raeburn  2344:                             $ufile=~s/^[\.\~]+//;
                   2345:                             my $path = $udir;
1.185     albertel 2346:                             if ($ufile =~m|(.+)/([^/]+)$|) {
                   2347:                                 my @parts=split('/',$1);
1.184     raeburn  2348:                                 foreach my $part (@parts) {
                   2349:                                     $path .= '/'.$part;
                   2350:                                     if ((-e $path)!=1) {
                   2351:                                         mkdir($path,0770);
1.182     raeburn  2352:                                     }
                   2353:                                 }
                   2354:                             }
1.184     raeburn  2355: 			    my $destname=$udir.'/'.$ufile;
                   2356: 			    my $transname=$udir.'/'.$ufile.'.in.transit';
                   2357: 			    my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
1.178     foxr     2358: 			    my $response;
                   2359: 			    {
                   2360: 				my $ua=new LWP::UserAgent;
                   2361: 				my $request=new HTTP::Request('GET',"$remoteurl");
                   2362: 				$response=$ua->request($request,$transname);
                   2363: 			    }
                   2364: 			    if ($response->is_error()) {
                   2365: 				unlink($transname);
                   2366: 				my $message=$response->status_line;
1.184     raeburn  2367: 				&logthis("LWP GET: $message for $fname ($remoteurl)");
1.178     foxr     2368: 				print $client "failed\n";
                   2369: 			    } else {
                   2370: 				if (!rename($transname,$destname)) {
                   2371: 				    &logthis("Unable to move $transname to $destname");
                   2372: 				    unlink($transname);
                   2373: 				    print $client "failed\n";
                   2374: 				} else {
                   2375: 				    print $client "ok\n";
                   2376: 				}
                   2377: 			    }
                   2378: 			} else {
                   2379: 			    print $client "not_home\n";
1.187     albertel 2380: 			}
                   2381: 		    } else {
                   2382: 			Reply($client, "refused\n", $userinput);
                   2383: 		    }
                   2384: # --------------------------------------------------------- remove a user file 
                   2385: 		} elsif ($userinput =~ /^removeuserfile/) { # Client clear or enc.
                   2386: 		    if(isClient) {
                   2387: 			my ($cmd,$fname)=split(/:/,$userinput);
                   2388: 			my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
                   2389: 			&logthis("$udom - $uname - $ufile");
                   2390: 			if ($ufile =~m|/\.\./|) {
                   2391: 			    # any files paths with /../ in them refuse 
                   2392:                             # to deal with
                   2393: 			    print $client "refused\n";
                   2394: 			} else {
                   2395: 			    my $udir=propath($udom,$uname);
                   2396: 			    if (-e $udir) {
                   2397: 				my $file=$udir.'/userfiles/'.$ufile;
                   2398: 				if (-e $file) {
                   2399: 				    unlink($file);
                   2400: 				    if (-e $file) {
                   2401: 					print $client "failed\n";
                   2402: 				    } else {
                   2403: 					print $client "ok\n";
                   2404: 				    }
                   2405: 				} else {
                   2406: 				    print $client "not_found\n";
                   2407: 				}
                   2408: 			    } else {
                   2409: 				print $client "not_home\n";
                   2410: 			    }
1.178     foxr     2411: 			}
                   2412: 		    } else {
                   2413: 			Reply($client, "refused\n", $userinput);
                   2414: 		    }
                   2415: # ------------------------------------------ authenticate access to a user file
                   2416: 		} elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
                   2417: 		    if(isClient) {
                   2418: 			my ($cmd,$fname,$session)=split(/:/,$userinput);
                   2419: 			chomp($session);
                   2420: 			my $reply='non_auth';
                   2421: 			if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
                   2422: 				 $session.'.id')) {
                   2423: 			    while (my $line=<ENVIN>) {
1.185     albertel 2424: 				if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
1.178     foxr     2425: 			    }
                   2426: 			    close(ENVIN);
                   2427: 			    print $client $reply."\n";
                   2428: 			} else {
                   2429: 			    print $client "invalid_token\n";
                   2430: 			}
                   2431: 		    } else {
                   2432: 			Reply($client, "refused\n", $userinput);
                   2433: 
                   2434: 		    }
                   2435: # ----------------------------------------------------------------- unsubscribe
                   2436: 		} elsif ($userinput =~ /^unsub/) {
                   2437: 		    if(isClient) {
                   2438: 			my ($cmd,$fname)=split(/:/,$userinput);
                   2439: 			if (-e $fname) {
1.188     foxr     2440: 			    print $client &unsub($fname,$clientip);
1.178     foxr     2441: 			} else {
                   2442: 			    print $client "not_found\n";
                   2443: 			}
                   2444: 		    } else {
                   2445: 			Reply($client, "refused\n", $userinput);
                   2446: 
                   2447: 		    }
                   2448: # ------------------------------------------------------------------- subscribe
                   2449: 		} elsif ($userinput =~ /^sub/) {
                   2450: 		    if(isClient) {
                   2451: 			print $client &subscribe($userinput,$clientip);
                   2452: 		    } else {
                   2453: 			Reply($client, "refused\n", $userinput);
                   2454: 
                   2455: 		    }
                   2456: # ------------------------------------------------------------- current version
                   2457: 		} elsif ($userinput =~ /^currentversion/) {
                   2458: 		    if(isClient) {
                   2459: 			my ($cmd,$fname)=split(/:/,$userinput);
                   2460: 			print $client &currentversion($fname)."\n";
                   2461: 		    } else {
                   2462: 			Reply($client, "refused\n", $userinput);
                   2463: 
                   2464: 		    }
                   2465: # ------------------------------------------------------------------------- log
                   2466: 		} elsif ($userinput =~ /^log/) {
                   2467: 		    if(isClient) {
                   2468: 			my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
                   2469: 			chomp($what);
                   2470: 			my $proname=propath($udom,$uname);
                   2471: 			my $now=time;
                   2472: 			{
                   2473: 			    my $hfh;
                   2474: 			    if ($hfh=IO::File->new(">>$proname/activity.log")) { 
                   2475: 				print $hfh "$now:$clientname:$what\n";
                   2476: 				print $client "ok\n"; 
                   2477: 			    } else {
                   2478: 				print $client "error: ".($!+0)
                   2479: 				    ." IO::File->new Failed "
                   2480: 				    ."while attempting log\n";
                   2481: 			    }
                   2482: 			}
                   2483: 		    } else {
                   2484: 			Reply($client, "refused\n", $userinput);
                   2485: 
                   2486: 		    }
                   2487: # ------------------------------------------------------------------------- put
                   2488: 		} elsif ($userinput =~ /^put/) {
                   2489: 		    if(isClient) {
1.206     raeburn  2490: 			my ($cmd,$udom,$uname,$namespace,$what,@extras)
1.178     foxr     2491: 			    =split(/:/,$userinput);
                   2492: 			$namespace=~s/\//\_/g;
                   2493: 			$namespace=~s/\W//g;
                   2494: 			if ($namespace ne 'roles') {
1.206     raeburn  2495:                             if (@extras) {
                   2496:                                 $what .= ':'.join(':',@extras);
                   2497:                             }
1.178     foxr     2498: 			    chomp($what);
                   2499: 			    my $proname=propath($udom,$uname);
                   2500: 			    my $now=time;
                   2501: 			    unless ($namespace=~/^nohist\_/) {
                   2502: 				my $hfh;
                   2503: 				if (
                   2504: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2505: 				    ) { print $hfh "P:$now:$what\n"; }
                   2506: 			    }
                   2507: 			    my @pairs=split(/\&/,$what);
                   2508: 			    my %hash;
                   2509: 			    if (tie(%hash,'GDBM_File',
                   2510: 				    "$proname/$namespace.db",
                   2511: 				    &GDBM_WRCREAT(),0640)) {
                   2512: 				foreach my $pair (@pairs) {
                   2513: 				    my ($key,$value)=split(/=/,$pair);
                   2514: 				    $hash{$key}=$value;
                   2515: 				}
                   2516: 				if (untie(%hash)) {
                   2517: 				    print $client "ok\n";
                   2518: 				} else {
                   2519: 				    print $client "error: ".($!+0)
                   2520: 					." untie(GDBM) failed ".
                   2521: 					"while attempting put\n";
                   2522: 				}
                   2523: 			    } else {
                   2524: 				print $client "error: ".($!)
                   2525: 				    ." tie(GDBM) Failed ".
                   2526: 				    "while attempting put\n";
                   2527: 			    }
                   2528: 			} else {
                   2529: 			    print $client "refused\n";
                   2530: 			}
                   2531: 		    } else {
                   2532: 			Reply($client, "refused\n", $userinput);
                   2533: 
                   2534: 		    }
                   2535: # ------------------------------------------------------------------- inc
                   2536: 		} elsif ($userinput =~ /^inc:/) {
                   2537: 		    if(isClient) {
                   2538: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2539: 			    =split(/:/,$userinput);
                   2540: 			$namespace=~s/\//\_/g;
                   2541: 			$namespace=~s/\W//g;
                   2542: 			if ($namespace ne 'roles') {
                   2543: 			    chomp($what);
                   2544: 			    my $proname=propath($udom,$uname);
                   2545: 			    my $now=time;
                   2546: 			    unless ($namespace=~/^nohist\_/) {
                   2547: 				my $hfh;
                   2548: 				if (
                   2549: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2550: 				    ) { print $hfh "P:$now:$what\n"; }
                   2551: 			    }
                   2552: 			    my @pairs=split(/\&/,$what);
                   2553: 			    my %hash;
                   2554: 			    if (tie(%hash,'GDBM_File',
                   2555: 				    "$proname/$namespace.db",
                   2556: 				    &GDBM_WRCREAT(),0640)) {
                   2557: 				foreach my $pair (@pairs) {
                   2558: 				    my ($key,$value)=split(/=/,$pair);
                   2559:                                     # We could check that we have a number...
                   2560:                                     if (! defined($value) || $value eq '') {
                   2561:                                         $value = 1;
                   2562:                                     }
                   2563: 				    $hash{$key}+=$value;
                   2564: 				}
                   2565: 				if (untie(%hash)) {
                   2566: 				    print $client "ok\n";
                   2567: 				} else {
                   2568: 				    print $client "error: ".($!+0)
                   2569: 					." untie(GDBM) failed ".
1.181     albertel 2570: 					"while attempting inc\n";
1.178     foxr     2571: 				}
                   2572: 			    } else {
                   2573: 				print $client "error: ".($!)
                   2574: 				    ." tie(GDBM) Failed ".
1.181     albertel 2575: 				    "while attempting inc\n";
1.178     foxr     2576: 			    }
                   2577: 			} else {
                   2578: 			    print $client "refused\n";
                   2579: 			}
                   2580: 		    } else {
                   2581: 			Reply($client, "refused\n", $userinput);
                   2582: 
                   2583: 		    }
                   2584: # -------------------------------------------------------------------- rolesput
                   2585: 		} elsif ($userinput =~ /^rolesput/) {
                   2586: 		    if(isClient) {
                   2587: 			&Debug("rolesput");
                   2588: 			if ($wasenc==1) {
                   2589: 			    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
                   2590: 				=split(/:/,$userinput);
                   2591: 			    &Debug("cmd = ".$cmd." exedom= ".$exedom.
                   2592: 				   "user = ".$exeuser." udom=".$udom.
                   2593: 				   "what = ".$what);
                   2594: 			    my $namespace='roles';
                   2595: 			    chomp($what);
                   2596: 			    my $proname=propath($udom,$uname);
                   2597: 			    my $now=time;
                   2598: 			    {
                   2599: 				my $hfh;
                   2600: 				if (
                   2601: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2602: 				    ) { 
                   2603: 				    print $hfh "P:$now:$exedom:$exeuser:$what\n";
                   2604: 				}
                   2605: 			    }
                   2606: 			    my @pairs=split(/\&/,$what);
                   2607: 			    my %hash;
                   2608: 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2609: 				foreach my $pair (@pairs) {
                   2610: 				    my ($key,$value)=split(/=/,$pair);
                   2611: 				    &ManagePermissions($key, $udom, $uname,
                   2612: 						       &GetAuthType( $udom, 
                   2613: 								     $uname));
                   2614: 				    $hash{$key}=$value;
                   2615: 				}
                   2616: 				if (untie(%hash)) {
                   2617: 				    print $client "ok\n";
                   2618: 				} else {
                   2619: 				    print $client "error: ".($!+0)
                   2620: 					." untie(GDBM) Failed ".
                   2621: 					"while attempting rolesput\n";
                   2622: 				}
                   2623: 			    } else {
                   2624: 				print $client "error: ".($!+0)
                   2625: 				    ." tie(GDBM) Failed ".
                   2626: 				    "while attempting rolesput\n";
                   2627: 			    }
                   2628: 			} else {
                   2629: 			    print $client "refused\n";
                   2630: 			}
                   2631: 		    } else {
                   2632: 			Reply($client, "refused\n", $userinput);
                   2633: 		  
                   2634: 		    }
                   2635: # -------------------------------------------------------------------- rolesdel
                   2636: 		} elsif ($userinput =~ /^rolesdel/) {
                   2637: 		    if(isClient) {
                   2638: 			&Debug("rolesdel");
                   2639: 			if ($wasenc==1) {
                   2640: 			    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
                   2641: 				=split(/:/,$userinput);
                   2642: 			    &Debug("cmd = ".$cmd." exedom= ".$exedom.
                   2643: 				   "user = ".$exeuser." udom=".$udom.
                   2644: 				   "what = ".$what);
                   2645: 			    my $namespace='roles';
                   2646: 			    chomp($what);
                   2647: 			    my $proname=propath($udom,$uname);
                   2648: 			    my $now=time;
                   2649: 			    {
                   2650: 				my $hfh;
                   2651: 				if (
                   2652: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2653: 				    ) { 
                   2654: 				    print $hfh "D:$now:$exedom:$exeuser:$what\n";
                   2655: 				}
                   2656: 			    }
                   2657: 			    my @rolekeys=split(/\&/,$what);
                   2658: 			    my %hash;
                   2659: 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2660: 				foreach my $key (@rolekeys) {
                   2661: 				    delete $hash{$key};
                   2662: 				}
                   2663: 				if (untie(%hash)) {
                   2664: 				    print $client "ok\n";
                   2665: 				} else {
                   2666: 				    print $client "error: ".($!+0)
                   2667: 					." untie(GDBM) Failed ".
                   2668: 					"while attempting rolesdel\n";
                   2669: 				}
                   2670: 			    } else {
                   2671: 				print $client "error: ".($!+0)
                   2672: 				    ." tie(GDBM) Failed ".
                   2673: 				    "while attempting rolesdel\n";
                   2674: 			    }
                   2675: 			} else {
                   2676: 			    print $client "refused\n";
                   2677: 			}
                   2678: 		    } else {
                   2679: 			Reply($client, "refused\n", $userinput);
                   2680: 		      
                   2681: 		    }
                   2682: # ------------------------------------------------------------------------- get
                   2683: 		} elsif ($userinput =~ /^get/) {
                   2684: 		    if(isClient) {
                   2685: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2686: 			    =split(/:/,$userinput);
                   2687: 			$namespace=~s/\//\_/g;
                   2688: 			$namespace=~s/\W//g;
                   2689: 			chomp($what);
                   2690: 			my @queries=split(/\&/,$what);
                   2691: 			my $proname=propath($udom,$uname);
                   2692: 			my $qresult='';
                   2693: 			my %hash;
                   2694: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2695: 			    for (my $i=0;$i<=$#queries;$i++) {
                   2696: 				$qresult.="$hash{$queries[$i]}&";
                   2697: 			    }
                   2698: 			    if (untie(%hash)) {
                   2699: 				$qresult=~s/\&$//;
                   2700: 				print $client "$qresult\n";
                   2701: 			    } else {
                   2702: 				print $client "error: ".($!+0)
                   2703: 				    ." untie(GDBM) Failed ".
                   2704: 				    "while attempting get\n";
                   2705: 			    }
                   2706: 			} else {
                   2707: 			    if ($!+0 == 2) {
                   2708: 				print $client "error:No such file or ".
                   2709: 				    "GDBM reported bad block error\n";
                   2710: 			    } else {
                   2711: 				print $client "error: ".($!+0)
                   2712: 				    ." tie(GDBM) Failed ".
                   2713: 				    "while attempting get\n";
                   2714: 			    }
                   2715: 			}
                   2716: 		    } else {
                   2717: 			Reply($client, "refused\n", $userinput);
                   2718: 		       
                   2719: 		    }
                   2720: # ------------------------------------------------------------------------ eget
                   2721: 		} elsif ($userinput =~ /^eget/) {
                   2722: 		    if (isClient) {
                   2723: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2724: 			    =split(/:/,$userinput);
                   2725: 			$namespace=~s/\//\_/g;
                   2726: 			$namespace=~s/\W//g;
                   2727: 			chomp($what);
                   2728: 			my @queries=split(/\&/,$what);
                   2729: 			my $proname=propath($udom,$uname);
                   2730: 			my $qresult='';
                   2731: 			my %hash;
                   2732: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2733: 			    for (my $i=0;$i<=$#queries;$i++) {
                   2734: 				$qresult.="$hash{$queries[$i]}&";
                   2735: 			    }
                   2736: 			    if (untie(%hash)) {
                   2737: 				$qresult=~s/\&$//;
                   2738: 				if ($cipher) {
                   2739: 				    my $cmdlength=length($qresult);
                   2740: 				    $qresult.="         ";
                   2741: 				    my $encqresult='';
                   2742: 				    for 
                   2743: 					(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
                   2744: 					    $encqresult.=
                   2745: 						unpack("H16",
                   2746: 						       $cipher->encrypt(substr($qresult,$encidx,8)));
                   2747: 					}
                   2748: 				    print $client "enc:$cmdlength:$encqresult\n";
                   2749: 				} else {
                   2750: 				    print $client "error:no_key\n";
                   2751: 				}
                   2752: 			    } else {
                   2753: 				print $client "error: ".($!+0)
                   2754: 				    ." untie(GDBM) Failed ".
                   2755: 				    "while attempting eget\n";
                   2756: 			    }
                   2757: 			} else {
                   2758: 			    print $client "error: ".($!+0)
                   2759: 				." tie(GDBM) Failed ".
                   2760: 				"while attempting eget\n";
                   2761: 			}
                   2762: 		    } else {
                   2763: 			Reply($client, "refused\n", $userinput);
                   2764: 		    
                   2765: 		    }
                   2766: # ------------------------------------------------------------------------- del
                   2767: 		} elsif ($userinput =~ /^del/) {
                   2768: 		    if(isClient) {
                   2769: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2770: 			    =split(/:/,$userinput);
                   2771: 			$namespace=~s/\//\_/g;
                   2772: 			$namespace=~s/\W//g;
                   2773: 			chomp($what);
                   2774: 			my $proname=propath($udom,$uname);
                   2775: 			my $now=time;
                   2776: 			unless ($namespace=~/^nohist\_/) {
                   2777: 			    my $hfh;
                   2778: 			    if (
                   2779: 				$hfh=IO::File->new(">>$proname/$namespace.hist")
                   2780: 				) { print $hfh "D:$now:$what\n"; }
                   2781: 			}
                   2782: 			my @keys=split(/\&/,$what);
                   2783: 			my %hash;
                   2784: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2785: 			    foreach my $key (@keys) {
                   2786: 				delete($hash{$key});
                   2787: 			    }
                   2788: 			    if (untie(%hash)) {
                   2789: 				print $client "ok\n";
                   2790: 			    } else {
                   2791: 				print $client "error: ".($!+0)
                   2792: 				    ." untie(GDBM) Failed ".
                   2793: 				    "while attempting del\n";
                   2794: 			    }
                   2795: 			} else {
                   2796: 			    print $client "error: ".($!+0)
                   2797: 				." tie(GDBM) Failed ".
                   2798: 				"while attempting del\n";
                   2799: 			}
                   2800: 		    } else {
                   2801: 			Reply($client, "refused\n", $userinput);
                   2802: 			
                   2803: 		    }
                   2804: # ------------------------------------------------------------------------ keys
                   2805: 		} elsif ($userinput =~ /^keys/) {
                   2806: 		    if(isClient) {
                   2807: 			my ($cmd,$udom,$uname,$namespace)
                   2808: 			    =split(/:/,$userinput);
                   2809: 			$namespace=~s/\//\_/g;
                   2810: 			$namespace=~s/\W//g;
                   2811: 			my $proname=propath($udom,$uname);
                   2812: 			my $qresult='';
                   2813: 			my %hash;
                   2814: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2815: 			    foreach my $key (keys %hash) {
                   2816: 				$qresult.="$key&";
                   2817: 			    }
                   2818: 			    if (untie(%hash)) {
                   2819: 				$qresult=~s/\&$//;
                   2820: 				print $client "$qresult\n";
                   2821: 			    } else {
                   2822: 				print $client "error: ".($!+0)
                   2823: 				    ." untie(GDBM) Failed ".
                   2824: 				    "while attempting keys\n";
                   2825: 			    }
                   2826: 			} else {
                   2827: 			    print $client "error: ".($!+0)
                   2828: 				." tie(GDBM) Failed ".
                   2829: 				"while attempting keys\n";
                   2830: 			}
                   2831: 		    } else {
                   2832: 			Reply($client, "refused\n", $userinput);
                   2833: 		   
                   2834: 		    }
                   2835: # ----------------------------------------------------------------- dumpcurrent
                   2836: 		} elsif ($userinput =~ /^currentdump/) {
                   2837: 		    if (isClient) {
                   2838: 			my ($cmd,$udom,$uname,$namespace)
                   2839: 			    =split(/:/,$userinput);
                   2840: 			$namespace=~s/\//\_/g;
                   2841: 			$namespace=~s/\W//g;
                   2842: 			my $qresult='';
                   2843: 			my $proname=propath($udom,$uname);
                   2844: 			my %hash;
                   2845: 			if (tie(%hash,'GDBM_File',
                   2846: 				"$proname/$namespace.db",
                   2847: 				&GDBM_READER(),0640)) {
                   2848: 			    # Structure of %data:
                   2849: 			    # $data{$symb}->{$parameter}=$value;
                   2850: 			    # $data{$symb}->{'v.'.$parameter}=$version;
                   2851: 			    # since $parameter will be unescaped, we do not
                   2852: 			    # have to worry about silly parameter names...
                   2853: 			    my %data = ();
                   2854: 			    while (my ($key,$value) = each(%hash)) {
                   2855: 				my ($v,$symb,$param) = split(/:/,$key);
                   2856: 				next if ($v eq 'version' || $symb eq 'keys');
                   2857: 				next if (exists($data{$symb}) && 
                   2858: 					 exists($data{$symb}->{$param}) &&
                   2859: 					 $data{$symb}->{'v.'.$param} > $v);
                   2860: 				$data{$symb}->{$param}=$value;
                   2861: 				$data{$symb}->{'v.'.$param}=$v;
                   2862: 			    }
                   2863: 			    if (untie(%hash)) {
                   2864: 				while (my ($symb,$param_hash) = each(%data)) {
                   2865: 				    while(my ($param,$value) = each (%$param_hash)){
                   2866: 					next if ($param =~ /^v\./);
                   2867: 					$qresult.=$symb.':'.$param.'='.$value.'&';
                   2868: 				    }
                   2869: 				}
                   2870: 				chop($qresult);
                   2871: 				print $client "$qresult\n";
                   2872: 			    } else {
                   2873: 				print $client "error: ".($!+0)
                   2874: 				    ." untie(GDBM) Failed ".
                   2875: 				    "while attempting currentdump\n";
                   2876: 			    }
                   2877: 			} else {
                   2878: 			    print $client "error: ".($!+0)
                   2879: 				." tie(GDBM) Failed ".
                   2880: 				"while attempting currentdump\n";
                   2881: 			}
                   2882: 		    } else {
                   2883: 			Reply($client, "refused\n", $userinput);
                   2884: 		    }
                   2885: # ------------------------------------------------------------------------ dump
                   2886: 		} elsif ($userinput =~ /^dump/) {
                   2887: 		    if(isClient) {
                   2888: 			my ($cmd,$udom,$uname,$namespace,$regexp)
                   2889: 			    =split(/:/,$userinput);
                   2890: 			$namespace=~s/\//\_/g;
                   2891: 			$namespace=~s/\W//g;
                   2892: 			if (defined($regexp)) {
                   2893: 			    $regexp=&unescape($regexp);
                   2894: 			} else {
                   2895: 			    $regexp='.';
                   2896: 			}
                   2897: 			my $qresult='';
                   2898: 			my $proname=propath($udom,$uname);
                   2899: 			my %hash;
                   2900: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2901: 			       while (my ($key,$value) = each(%hash)) {
                   2902: 				   if ($regexp eq '.') {
                   2903: 				       $qresult.=$key.'='.$value.'&';
                   2904: 				   } else {
                   2905: 				       my $unescapeKey = &unescape($key);
                   2906: 				       if (eval('$unescapeKey=~/$regexp/')) {
                   2907: 					   $qresult.="$key=$value&";
                   2908: 				       }
                   2909: 				   }
                   2910: 			       }
                   2911: 			       if (untie(%hash)) {
                   2912: 				   chop($qresult);
                   2913: 				   print $client "$qresult\n";
                   2914: 			       } else {
                   2915: 				   print $client "error: ".($!+0)
                   2916: 				       ." untie(GDBM) Failed ".
                   2917:                                        "while attempting dump\n";
                   2918: 			       }
                   2919: 			   } else {
                   2920: 			       print $client "error: ".($!+0)
                   2921: 				   ." tie(GDBM) Failed ".
                   2922: 				   "while attempting dump\n";
                   2923: 			   }
                   2924: 		    } else {
                   2925: 			Reply($client, "refused\n", $userinput);
                   2926: 		 
                   2927: 		    }
                   2928: # ----------------------------------------------------------------------- store
                   2929: 		} elsif ($userinput =~ /^store/) {
                   2930: 		    if(isClient) {
                   2931: 			my ($cmd,$udom,$uname,$namespace,$rid,$what)
                   2932: 			    =split(/:/,$userinput);
                   2933: 			$namespace=~s/\//\_/g;
                   2934: 			$namespace=~s/\W//g;
                   2935: 			if ($namespace ne 'roles') {
                   2936: 			    chomp($what);
                   2937: 			    my $proname=propath($udom,$uname);
                   2938: 			    my $now=time;
                   2939: 			    unless ($namespace=~/^nohist\_/) {
                   2940: 				my $hfh;
                   2941: 				if (
                   2942: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2943: 				    ) { print $hfh "P:$now:$rid:$what\n"; }
                   2944: 			    }
                   2945: 			    my @pairs=split(/\&/,$what);
                   2946: 			    my %hash;
                   2947: 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2948: 				my @previouskeys=split(/&/,$hash{"keys:$rid"});
                   2949: 				my $key;
                   2950: 				$hash{"version:$rid"}++;
                   2951: 				my $version=$hash{"version:$rid"};
                   2952: 				my $allkeys=''; 
                   2953: 				foreach my $pair (@pairs) {
                   2954: 				    my ($key,$value)=split(/=/,$pair);
                   2955: 				    $allkeys.=$key.':';
                   2956: 				    $hash{"$version:$rid:$key"}=$value;
                   2957: 				}
                   2958: 				$hash{"$version:$rid:timestamp"}=$now;
                   2959: 				$allkeys.='timestamp';
                   2960: 				$hash{"$version:keys:$rid"}=$allkeys;
                   2961: 				if (untie(%hash)) {
                   2962: 				    print $client "ok\n";
                   2963: 				} else {
                   2964: 				    print $client "error: ".($!+0)
                   2965: 					." untie(GDBM) Failed ".
                   2966: 					"while attempting store\n";
                   2967: 				}
                   2968: 			    } else {
                   2969: 				print $client "error: ".($!+0)
                   2970: 				    ." tie(GDBM) Failed ".
                   2971: 				    "while attempting store\n";
                   2972: 			    }
                   2973: 			} else {
                   2974: 			    print $client "refused\n";
                   2975: 			}
                   2976: 		    } else {
                   2977: 			Reply($client, "refused\n", $userinput);
                   2978: 		     
                   2979: 		    }
                   2980: # --------------------------------------------------------------------- restore
                   2981: 		} elsif ($userinput =~ /^restore/) {
                   2982: 		    if(isClient) {
                   2983: 			my ($cmd,$udom,$uname,$namespace,$rid)
                   2984: 			    =split(/:/,$userinput);
                   2985: 			$namespace=~s/\//\_/g;
                   2986: 			$namespace=~s/\W//g;
                   2987: 			chomp($rid);
                   2988: 			my $proname=propath($udom,$uname);
                   2989: 			my $qresult='';
                   2990: 			my %hash;
                   2991: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2992: 			    my $version=$hash{"version:$rid"};
                   2993: 			    $qresult.="version=$version&";
                   2994: 			    my $scope;
                   2995: 			    for ($scope=1;$scope<=$version;$scope++) {
                   2996: 				my $vkeys=$hash{"$scope:keys:$rid"};
                   2997: 				my @keys=split(/:/,$vkeys);
                   2998: 				my $key;
                   2999: 				$qresult.="$scope:keys=$vkeys&";
                   3000: 				foreach $key (@keys) {
                   3001: 				    $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
                   3002: 				}                                  
                   3003: 			    }
                   3004: 			    if (untie(%hash)) {
                   3005: 				$qresult=~s/\&$//;
                   3006: 				print $client "$qresult\n";
                   3007: 			    } else {
                   3008: 				print $client "error: ".($!+0)
                   3009: 				    ." untie(GDBM) Failed ".
                   3010: 				    "while attempting restore\n";
                   3011: 			    }
                   3012: 			} else {
                   3013: 			    print $client "error: ".($!+0)
                   3014: 				." tie(GDBM) Failed ".
                   3015: 				"while attempting restore\n";
                   3016: 			}
                   3017: 		    } else  {
                   3018: 			Reply($client, "refused\n", $userinput);
                   3019: 		       
                   3020: 		    }
                   3021: # -------------------------------------------------------------------- chatsend
                   3022: 		} elsif ($userinput =~ /^chatsend/) {
                   3023: 		    if(isClient) {
                   3024: 			my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
                   3025: 			&chatadd($cdom,$cnum,$newpost);
                   3026: 			print $client "ok\n";
                   3027: 		    } else {
                   3028: 			Reply($client, "refused\n", $userinput);
                   3029: 		      
                   3030: 		    }
                   3031: # -------------------------------------------------------------------- chatretr
                   3032: 		} elsif ($userinput =~ /^chatretr/) {
                   3033: 		    if(isClient) {
                   3034: 			my 
                   3035: 			    ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
                   3036: 			my $reply='';
                   3037: 			foreach (&getchat($cdom,$cnum,$udom,$uname)) {
                   3038: 			    $reply.=&escape($_).':';
                   3039: 			}
                   3040: 			$reply=~s/\:$//;
                   3041: 			print $client $reply."\n";
                   3042: 		    } else {
                   3043: 			Reply($client, "refused\n", $userinput);
                   3044: 		       
                   3045: 		    }
                   3046: # ------------------------------------------------------------------- querysend
                   3047: 		} elsif ($userinput =~ /^querysend/) {
1.193     raeburn  3048: 		    if (isClient) {
1.178     foxr     3049: 			my ($cmd,$query,
                   3050: 			    $arg1,$arg2,$arg3)=split(/\:/,$userinput);
                   3051: 			$query=~s/\n*$//g;
                   3052: 			print $client "".
                   3053: 			    sqlreply("$clientname\&$query".
                   3054: 				     "\&$arg1"."\&$arg2"."\&$arg3")."\n";
                   3055: 		    } else {
                   3056: 			Reply($client, "refused\n", $userinput);
                   3057: 		      
                   3058: 		    }
                   3059: # ------------------------------------------------------------------ queryreply
                   3060: 		} elsif ($userinput =~ /^queryreply/) {
                   3061: 		    if(isClient) {
                   3062: 			my ($cmd,$id,$reply)=split(/:/,$userinput); 
                   3063: 			my $store;
                   3064: 			my $execdir=$perlvar{'lonDaemons'};
                   3065: 			if ($store=IO::File->new(">$execdir/tmp/$id")) {
                   3066: 			    $reply=~s/\&/\n/g;
                   3067: 			    print $store $reply;
                   3068: 			    close $store;
                   3069: 			    my $store2=IO::File->new(">$execdir/tmp/$id.end");
                   3070: 			    print $store2 "done\n";
                   3071: 			    close $store2;
                   3072: 			    print $client "ok\n";
                   3073: 			}
                   3074: 			else {
                   3075: 			    print $client "error: ".($!+0)
                   3076: 				." IO::File->new Failed ".
                   3077: 				"while attempting queryreply\n";
                   3078: 			}
                   3079: 		    } else {
                   3080: 			Reply($client, "refused\n", $userinput);
                   3081: 		     
                   3082: 		    }
                   3083: # ----------------------------------------------------------------- courseidput
                   3084: 		} elsif ($userinput =~ /^courseidput/) {
                   3085: 		    if(isClient) {
                   3086: 			my ($cmd,$udom,$what)=split(/:/,$userinput);
                   3087: 			chomp($what);
                   3088: 			$udom=~s/\W//g;
                   3089: 			my $proname=
                   3090: 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
                   3091: 			my $now=time;
                   3092: 			my @pairs=split(/\&/,$what);
                   3093: 			my %hash;
                   3094: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
                   3095: 			    foreach my $pair (@pairs) {
1.202     raeburn  3096: 				my ($key,$descr,$inst_code)=split(/=/,$pair);
                   3097: 				$hash{$key}=$descr.':'.$inst_code.':'.$now;
1.178     foxr     3098: 			    }
                   3099: 			    if (untie(%hash)) {
                   3100: 				print $client "ok\n";
                   3101: 			    } else {
                   3102: 				print $client "error: ".($!+0)
                   3103: 				    ." untie(GDBM) Failed ".
                   3104: 				    "while attempting courseidput\n";
                   3105: 			    }
                   3106: 			} else {
                   3107: 			    print $client "error: ".($!+0)
                   3108: 				." tie(GDBM) Failed ".
                   3109: 				"while attempting courseidput\n";
                   3110: 			}
                   3111: 		    } else {
                   3112: 			Reply($client, "refused\n", $userinput);
                   3113: 		       
                   3114: 		    }
                   3115: # ---------------------------------------------------------------- courseiddump
                   3116: 		} elsif ($userinput =~ /^courseiddump/) {
                   3117: 		    if(isClient) {
                   3118: 			my ($cmd,$udom,$since,$description)
                   3119: 			    =split(/:/,$userinput);
                   3120: 			if (defined($description)) {
                   3121: 			    $description=&unescape($description);
                   3122: 			} else {
                   3123: 			    $description='.';
                   3124: 			}
                   3125: 			unless (defined($since)) { $since=0; }
                   3126: 			my $qresult='';
                   3127: 			my $proname=
                   3128: 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
                   3129: 			my %hash;
                   3130: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
                   3131: 			    while (my ($key,$value) = each(%hash)) {
1.202     raeburn  3132:                                 my ($descr,$lasttime,$inst_code);
                   3133:                                 if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
                   3134: 				    ($descr,$inst_code,$lasttime)=($1,$2,$3);
                   3135:                                 } else {
                   3136:                                     ($descr,$lasttime) = split(/\:/,$value);
                   3137:                                 }
1.178     foxr     3138: 				if ($lasttime<$since) { next; }
                   3139: 				if ($description eq '.') {
1.202     raeburn  3140: 				    $qresult.=$key.'='.$descr.':'.$inst_code.'&';
1.178     foxr     3141: 				} else {
                   3142: 				    my $unescapeVal = &unescape($descr);
1.189     www      3143: 				    if (eval('$unescapeVal=~/\Q$description\E/i')) {
1.202     raeburn  3144: 					$qresult.=$key.'='.$descr.':'.$inst_code.'&';
1.178     foxr     3145: 				    }
                   3146: 				}
                   3147: 			    }
                   3148: 			    if (untie(%hash)) {
                   3149: 				chop($qresult);
                   3150: 				print $client "$qresult\n";
                   3151: 			    } else {
                   3152: 				print $client "error: ".($!+0)
                   3153: 				    ." untie(GDBM) Failed ".
                   3154: 				    "while attempting courseiddump\n";
                   3155: 			    }
                   3156: 			} else {
                   3157: 			    print $client "error: ".($!+0)
                   3158: 				." tie(GDBM) Failed ".
                   3159: 				"while attempting courseiddump\n";
                   3160: 			}
                   3161: 		    } else {
                   3162: 			Reply($client, "refused\n", $userinput);
                   3163: 		       
                   3164: 		    }
                   3165: # ----------------------------------------------------------------------- idput
                   3166: 		} elsif ($userinput =~ /^idput/) {
                   3167: 		    if(isClient) {
                   3168: 			my ($cmd,$udom,$what)=split(/:/,$userinput);
                   3169: 			chomp($what);
                   3170: 			$udom=~s/\W//g;
                   3171: 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
                   3172: 			my $now=time;
                   3173: 			{
                   3174: 			    my $hfh;
                   3175: 			    if (
                   3176: 				$hfh=IO::File->new(">>$proname.hist")
                   3177: 				) { print $hfh "P:$now:$what\n"; }
                   3178: 			}
                   3179: 			my @pairs=split(/\&/,$what);
                   3180: 			my %hash;
                   3181: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
                   3182: 			    foreach my $pair (@pairs) {
                   3183: 				my ($key,$value)=split(/=/,$pair);
                   3184: 				$hash{$key}=$value;
                   3185: 			    }
                   3186: 			    if (untie(%hash)) {
                   3187: 				print $client "ok\n";
                   3188: 			    } else {
                   3189: 				print $client "error: ".($!+0)
                   3190: 				    ." untie(GDBM) Failed ".
                   3191: 				    "while attempting idput\n";
                   3192: 			    }
                   3193: 			} else {
                   3194: 			    print $client "error: ".($!+0)
                   3195: 				." tie(GDBM) Failed ".
                   3196: 				"while attempting idput\n";
                   3197: 			}
                   3198: 		    } else {
                   3199: 			Reply($client, "refused\n", $userinput);
                   3200: 		       
                   3201: 		    }
                   3202: # ----------------------------------------------------------------------- idget
                   3203: 		} elsif ($userinput =~ /^idget/) {
                   3204: 		    if(isClient) {
                   3205: 			my ($cmd,$udom,$what)=split(/:/,$userinput);
                   3206: 			chomp($what);
                   3207: 			$udom=~s/\W//g;
                   3208: 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
                   3209: 			my @queries=split(/\&/,$what);
                   3210: 			my $qresult='';
                   3211: 			my %hash;
                   3212: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
                   3213: 			    for (my $i=0;$i<=$#queries;$i++) {
                   3214: 				$qresult.="$hash{$queries[$i]}&";
                   3215: 			    }
                   3216: 			    if (untie(%hash)) {
                   3217: 				$qresult=~s/\&$//;
                   3218: 				print $client "$qresult\n";
                   3219: 			    } else {
                   3220: 				print $client "error: ".($!+0)
                   3221: 				    ." untie(GDBM) Failed ".
                   3222: 				    "while attempting idget\n";
                   3223: 			    }
                   3224: 			} else {
                   3225: 			    print $client "error: ".($!+0)
                   3226: 				." tie(GDBM) Failed ".
                   3227: 				"while attempting idget\n";
                   3228: 			}
                   3229: 		    } else {
                   3230: 			Reply($client, "refused\n", $userinput);
                   3231: 		       
                   3232: 		    }
                   3233: # ---------------------------------------------------------------------- tmpput
                   3234: 		} elsif ($userinput =~ /^tmpput/) {
                   3235: 		    if(isClient) {
                   3236: 			my ($cmd,$what)=split(/:/,$userinput);
                   3237: 			my $store;
                   3238: 			$tmpsnum++;
                   3239: 			my $id=$$.'_'.$clientip.'_'.$tmpsnum;
                   3240: 			$id=~s/\W/\_/g;
                   3241: 			$what=~s/\n//g;
                   3242: 			my $execdir=$perlvar{'lonDaemons'};
                   3243: 			if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
                   3244: 			    print $store $what;
                   3245: 			    close $store;
                   3246: 			    print $client "$id\n";
                   3247: 			}
                   3248: 			else {
                   3249: 			    print $client "error: ".($!+0)
                   3250: 				."IO::File->new Failed ".
                   3251: 				"while attempting tmpput\n";
                   3252: 			}
                   3253: 		    } else {
                   3254: 			Reply($client, "refused\n", $userinput);
                   3255: 		    
                   3256: 		    }
                   3257: 		    
                   3258: # ---------------------------------------------------------------------- tmpget
                   3259: 		} elsif ($userinput =~ /^tmpget/) {
                   3260: 		    if(isClient) {
                   3261: 			my ($cmd,$id)=split(/:/,$userinput);
                   3262: 			chomp($id);
                   3263: 			$id=~s/\W/\_/g;
                   3264: 			my $store;
                   3265: 			my $execdir=$perlvar{'lonDaemons'};
                   3266: 			if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
                   3267: 			    my $reply=<$store>;
                   3268: 			    print $client "$reply\n";
                   3269: 			    close $store;
                   3270: 			}
                   3271: 			else {
                   3272: 			    print $client "error: ".($!+0)
                   3273: 				."IO::File->new Failed ".
                   3274: 				"while attempting tmpget\n";
                   3275: 			}
                   3276: 		    } else {
                   3277: 			Reply($client, "refused\n", $userinput);
                   3278: 		      
                   3279: 		    }
                   3280: # ---------------------------------------------------------------------- tmpdel
                   3281: 		} elsif ($userinput =~ /^tmpdel/) {
                   3282: 		    if(isClient) {
                   3283: 			my ($cmd,$id)=split(/:/,$userinput);
                   3284: 			chomp($id);
                   3285: 			$id=~s/\W/\_/g;
                   3286: 			my $execdir=$perlvar{'lonDaemons'};
                   3287: 			if (unlink("$execdir/tmp/$id.tmp")) {
                   3288: 			    print $client "ok\n";
                   3289: 			} else {
                   3290: 			    print $client "error: ".($!+0)
                   3291: 				."Unlink tmp Failed ".
                   3292: 				"while attempting tmpdel\n";
                   3293: 			}
                   3294: 		    } else {
                   3295: 			Reply($client, "refused\n", $userinput);
                   3296: 		     
                   3297: 		    }
1.201     matthew  3298: # ----------------------------------------- portfolio directory list (portls)
                   3299:                 } elsif ($userinput =~ /^portls/) {
                   3300:                     if(isClient) {
                   3301:                         my ($cmd,$uname,$udom)=split(/:/,$userinput);
                   3302:                         my $udir=propath($udom,$uname).'/userfiles/portfolio';
                   3303:                         my $dirLine='';
                   3304:                         my $dirContents='';
                   3305:                         if (opendir(LSDIR,$udir.'/')){
                   3306:                             while ($dirLine = readdir(LSDIR)){
                   3307:                                 $dirContents = $dirContents.$dirLine.'<br />';
                   3308:                             }
                   3309:                         } else {
                   3310:                             $dirContents = "No directory found\n";
                   3311:                         }
                   3312:                         print $client $dirContents."\n";
                   3313:                     } else {
                   3314:                         Reply($client, "refused\n", $userinput);
                   3315:                     }
1.178     foxr     3316: # -------------------------------------------------------------------------- ls
                   3317: 		} elsif ($userinput =~ /^ls/) {
                   3318: 		    if(isClient) {
                   3319: 			my $obs;
                   3320: 			my $rights;
                   3321: 			my ($cmd,$ulsdir)=split(/:/,$userinput);
                   3322: 			my $ulsout='';
                   3323: 			my $ulsfn;
                   3324: 			if (-e $ulsdir) {
                   3325: 			    if(-d $ulsdir) {
                   3326: 				if (opendir(LSDIR,$ulsdir)) {
                   3327: 				    while ($ulsfn=readdir(LSDIR)) {
                   3328: 					undef $obs, $rights; 
                   3329: 					my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   3330: 					#We do some obsolete checking here
                   3331: 					if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                   3332: 					    open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                   3333: 					    my @obsolete=<FILE>;
                   3334: 					    foreach my $obsolete (@obsolete) {
                   3335: 					        if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; } 
                   3336: 						if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
                   3337: 					    }
                   3338: 					}
                   3339: 					$ulsout.=$ulsfn.'&'.join('&',@ulsstats);
                   3340: 					if($obs eq '1') { $ulsout.="&1"; }
                   3341: 					else { $ulsout.="&0"; }
                   3342: 					if($rights eq '1') { $ulsout.="&1:"; }
                   3343: 					else { $ulsout.="&0:"; }
                   3344: 				    }
                   3345: 				    closedir(LSDIR);
                   3346: 				}
                   3347: 			    } else {
                   3348: 				my @ulsstats=stat($ulsdir);
                   3349: 				$ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   3350: 			    }
                   3351: 			} else {
                   3352: 			    $ulsout='no_such_dir';
                   3353: 			}
                   3354: 			if ($ulsout eq '') { $ulsout='empty'; }
                   3355: 			print $client "$ulsout\n";
                   3356: 		    } else {
                   3357: 			Reply($client, "refused\n", $userinput);
                   3358: 		     
                   3359: 		    }
                   3360: # ----------------------------------------------------------------- setannounce
                   3361: 		} elsif ($userinput =~ /^setannounce/) {
                   3362: 		    if (isClient) {
                   3363: 			my ($cmd,$announcement)=split(/:/,$userinput);
                   3364: 			chomp($announcement);
                   3365: 			$announcement=&unescape($announcement);
                   3366: 			if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
                   3367: 						    '/announcement.txt')) {
                   3368: 			    print $store $announcement;
                   3369: 			    close $store;
                   3370: 			    print $client "ok\n";
                   3371: 			} else {
                   3372: 			    print $client "error: ".($!+0)."\n";
                   3373: 			}
                   3374: 		    } else {
                   3375: 			Reply($client, "refused\n", $userinput);
                   3376: 		       
                   3377: 		    }
                   3378: # ------------------------------------------------------------------ Hanging up
                   3379: 		} elsif (($userinput =~ /^exit/) ||
                   3380: 			 ($userinput =~ /^init/)) { # no restrictions.
                   3381: 		    &logthis(
                   3382: 			     "Client $clientip ($clientname) hanging up: $userinput");
                   3383: 		    print $client "bye\n";
                   3384: 		    $client->shutdown(2);        # shutdown the socket forcibly.
                   3385: 		    $client->close();
                   3386: 		    last;
1.161     foxr     3387: 
1.178     foxr     3388: # ---------------------------------- set current host/domain
                   3389: 		} elsif ($userinput =~ /^sethost:/) {
                   3390: 		    if (isClient) {
                   3391: 			print $client &sethost($userinput)."\n";
                   3392: 		    } else {
                   3393: 			print $client "refused\n";
                   3394: 		    }
                   3395: #---------------------------------- request file (?) version.
                   3396: 		} elsif ($userinput =~/^version:/) {
                   3397: 		    if (isClient) {
                   3398: 			print $client &version($userinput)."\n";
                   3399: 		    } else {
                   3400: 			print $client "refused\n";
                   3401: 		    }
1.193     raeburn  3402: #------------------------------- is auto-enrollment enabled?
1.200     matthew  3403:                 } elsif ($userinput =~/^autorun:/) {
1.193     raeburn  3404:                     if (isClient) {
1.200     matthew  3405:                         my ($cmd,$cdom) = split(/:/,$userinput);
                   3406:                         my $outcome = &localenroll::run($cdom);
1.193     raeburn  3407:                         print $client "$outcome\n";
                   3408:                     } else {
                   3409:                         print $client "0\n";
                   3410:                     }
                   3411: #------------------------------- get official sections (for auto-enrollment).
1.200     matthew  3412:                 } elsif ($userinput =~/^autogetsections:/) {
1.193     raeburn  3413:                     if (isClient) {
1.200     matthew  3414:                         my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
                   3415:                         my @secs = &localenroll::get_sections($coursecode,$cdom);
1.193     raeburn  3416:                         my $seclist = &escape(join(':',@secs));
                   3417:                         print $client "$seclist\n";
                   3418:                     } else {
                   3419:                         print $client "refused\n";
                   3420:                     }
                   3421: #----------------------- validate owner of new course section (for auto-enrollment).
1.200     matthew  3422:                 } elsif ($userinput =~/^autonewcourse:/) {
1.193     raeburn  3423:                     if (isClient) {
1.200     matthew  3424:                         my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
                   3425:                         my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
1.193     raeburn  3426:                         print $client "$outcome\n";
                   3427:                     } else {
                   3428:                         print $client "refused\n";
                   3429:                     }
                   3430: #-------------- validate course section in schedule of classes (for auto-enrollment).
1.200     matthew  3431:                 } elsif ($userinput =~/^autovalidatecourse:/) {
1.193     raeburn  3432:                     if (isClient) {
1.200     matthew  3433:                         my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
                   3434:                         my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
1.193     raeburn  3435:                         print $client "$outcome\n";
                   3436:                     } else {
                   3437:                         print $client "refused\n";
                   3438:                     }
                   3439: #--------------------------- create password for new user (for auto-enrollment).
1.200     matthew  3440:                 } elsif ($userinput =~/^autocreatepassword:/) {
1.193     raeburn  3441:                     if (isClient) {
1.200     matthew  3442:                         my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
                   3443:                         my ($create_passwd,$authchk);
                   3444:                         ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
1.193     raeburn  3445:                         print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
                   3446:                     } else {
                   3447:                         print $client "refused\n";
                   3448:                     }
                   3449: #---------------------------  read and remove temporary files (for auto-enrollment).
1.200     matthew  3450:                 } elsif ($userinput =~/^autoretrieve:/) {
1.193     raeburn  3451:                     if (isClient) {
                   3452:                         my ($cmd,$filename) = split(/:/,$userinput);
                   3453:                         my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
                   3454:                         if ( (-e $source) && ($filename ne '') ) {
                   3455:                             my $reply = '';
                   3456:                             if (open(my $fh,$source)) {
                   3457:                                 while (<$fh>) {
                   3458:                                     chomp($_);
                   3459:                                     $_ =~ s/^\s+//g;
                   3460:                                     $_ =~ s/\s+$//g;
                   3461:                                     $reply .= $_;
                   3462:                                 }
                   3463:                                 close($fh);
                   3464:                                 print $client &escape($reply)."\n";
                   3465: #                                unlink($source);
                   3466:                             } else {
                   3467:                                 print $client "error\n";
                   3468:                             }
                   3469:                         } else {
                   3470:                             print $client "error\n";
                   3471:                         }
                   3472:                     } else {
                   3473:                         print $client "refused\n";
                   3474:                     }
1.205     raeburn  3475: #---------------------  read and retrieve institutional code format (for support form).
                   3476:                 } elsif ($userinput =~/^autoinstcodeformat:/) {
                   3477:                     if (isClient) {
                   3478:                         my $reply;
                   3479:                         my($cmd,$cdom,$course) = split(/:/,$userinput);
                   3480:                         my @pairs = split/\&/,$course;
                   3481:                         my %instcodes = ();
                   3482:                         my %codes = ();
                   3483:                         my @codetitles = ();
                   3484:                         my %cat_titles = ();
                   3485:                         my %cat_order = ();
                   3486:                         foreach (@pairs) {
                   3487:                             my ($key,$value) = split/=/,$_;
                   3488:                             $instcodes{&unescape($key)} = &unescape($value);
                   3489:                         }
                   3490:                         my $formatreply = &localenroll::instcode_format($cdom,\%instcodes,\%codes,\@codetitles,\%cat_titles,\%cat_order);
                   3491:                         if ($formatreply eq 'ok') {
                   3492:                             my $codes_str = &hash2str(%codes);
                   3493:                             my $codetitles_str = &array2str(@codetitles);
                   3494:                             my $cat_titles_str = &hash2str(%cat_titles);
                   3495:                             my $cat_order_str = &hash2str(%cat_order);
                   3496:                             print $client $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'.$cat_order_str."\n";
                   3497:                         }
                   3498:                     } else {
                   3499:                         print $client "refused\n";
                   3500:                     }
1.178     foxr     3501: # ------------------------------------------------------------- unknown command
1.161     foxr     3502: 
1.178     foxr     3503: 		} else {
                   3504: 		    # unknown command
                   3505: 		    print $client "unknown_cmd\n";
                   3506: 		}
1.177     foxr     3507: # -------------------------------------------------------------------- complete
1.178     foxr     3508: 		alarm(0);
1.200     matthew  3509: 		&status('Listening to '.$clientname." ($keymode)");
1.161     foxr     3510: 	    }
1.59      www      3511: # --------------------------------------------- client unknown or fishy, refuse
1.161     foxr     3512: 	} else {
                   3513: 	    print $client "refused\n";
                   3514: 	    $client->close();
1.190     albertel 3515: 	    &logthis("<font color='blue'>WARNING: "
1.161     foxr     3516: 		     ."Rejected client $clientip, closing connection</font>");
                   3517: 	}
                   3518:     }             
                   3519:     
1.1       albertel 3520: # =============================================================================
1.161     foxr     3521:     
1.190     albertel 3522:     &logthis("<font color='red'>CRITICAL: "
1.161     foxr     3523: 	     ."Disconnect from $clientip ($clientname)</font>");    
                   3524:     
                   3525:     
                   3526:     # this exit is VERY important, otherwise the child will become
                   3527:     # a producer of more and more children, forking yourself into
                   3528:     # process death.
                   3529:     exit;
1.106     foxr     3530:     
1.78      foxr     3531: }
                   3532: 
                   3533: 
                   3534: #
                   3535: #   Checks to see if the input roleput request was to set
                   3536: # an author role.  If so, invokes the lchtmldir script to set
                   3537: # up a correct public_html 
                   3538: # Parameters:
                   3539: #    request   - The request sent to the rolesput subchunk.
                   3540: #                We're looking for  /domain/_au
                   3541: #    domain    - The domain in which the user is having roles doctored.
                   3542: #    user      - Name of the user for which the role is being put.
                   3543: #    authtype  - The authentication type associated with the user.
                   3544: #
                   3545: sub ManagePermissions
                   3546: {
1.192     foxr     3547: 
                   3548:     my ($request, $domain, $user, $authtype) = @_;
1.78      foxr     3549: 
                   3550:     # See if the request is of the form /$domain/_au
                   3551:     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
                   3552: 	my $execdir = $perlvar{'lonDaemons'};
                   3553: 	my $userhome= "/home/$user" ;
1.134     albertel 3554: 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.78      foxr     3555: 	system("$execdir/lchtmldir $userhome $user $authtype");
                   3556:     }
                   3557: }
                   3558: #
                   3559: #   GetAuthType - Determines the authorization type of a user in a domain.
                   3560: 
                   3561: #     Returns the authorization type or nouser if there is no such user.
                   3562: #
                   3563: sub GetAuthType 
                   3564: {
1.192     foxr     3565: 
                   3566:     my ($domain, $user)  = @_;
1.78      foxr     3567: 
1.79      foxr     3568:     Debug("GetAuthType( $domain, $user ) \n");
1.78      foxr     3569:     my $proname    = &propath($domain, $user); 
                   3570:     my $passwdfile = "$proname/passwd";
                   3571:     if( -e $passwdfile ) {
                   3572: 	my $pf = IO::File->new($passwdfile);
                   3573: 	my $realpassword = <$pf>;
                   3574: 	chomp($realpassword);
1.79      foxr     3575: 	Debug("Password info = $realpassword\n");
1.78      foxr     3576: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79      foxr     3577: 	Debug("Authtype = $authtype, content = $contentpwd\n");
1.78      foxr     3578: 	my $availinfo = '';
1.91      albertel 3579: 	if($authtype eq 'krb4' or $authtype eq 'krb5') {
1.78      foxr     3580: 	    $availinfo = $contentpwd;
                   3581: 	}
1.79      foxr     3582: 
1.78      foxr     3583: 	return "$authtype:$availinfo";
                   3584:     }
                   3585:     else {
1.79      foxr     3586: 	Debug("Returning nouser");
1.78      foxr     3587: 	return "nouser";
                   3588:     }
1.1       albertel 3589: }
                   3590: 
1.84      albertel 3591: sub addline {
                   3592:     my ($fname,$hostid,$ip,$newline)=@_;
                   3593:     my $contents;
                   3594:     my $found=0;
                   3595:     my $expr='^'.$hostid.':'.$ip.':';
                   3596:     $expr =~ s/\./\\\./g;
1.134     albertel 3597:     my $sh;
1.84      albertel 3598:     if ($sh=IO::File->new("$fname.subscription")) {
                   3599: 	while (my $subline=<$sh>) {
                   3600: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
                   3601: 	}
                   3602: 	$sh->close();
                   3603:     }
                   3604:     $sh=IO::File->new(">$fname.subscription");
                   3605:     if ($contents) { print $sh $contents; }
                   3606:     if ($newline) { print $sh $newline; }
                   3607:     $sh->close();
                   3608:     return $found;
1.86      www      3609: }
                   3610: 
                   3611: sub getchat {
1.122     www      3612:     my ($cdom,$cname,$udom,$uname)=@_;
1.87      www      3613:     my %hash;
                   3614:     my $proname=&propath($cdom,$cname);
                   3615:     my @entries=();
1.88      albertel 3616:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   3617: 	    &GDBM_READER(),0640)) {
                   3618: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   3619: 	untie %hash;
1.123     www      3620:     }
1.124     www      3621:     my @participants=();
1.134     albertel 3622:     my $cutoff=time-60;
1.123     www      3623:     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
1.124     www      3624: 	    &GDBM_WRCREAT(),0640)) {
                   3625:         $hash{$uname.':'.$udom}=time;
1.123     www      3626:         foreach (sort keys %hash) {
                   3627: 	    if ($hash{$_}>$cutoff) {
1.124     www      3628: 		$participants[$#participants+1]='active_participant:'.$_;
1.123     www      3629:             }
                   3630:         }
                   3631:         untie %hash;
1.86      www      3632:     }
1.124     www      3633:     return (@participants,@entries);
1.86      www      3634: }
                   3635: 
                   3636: sub chatadd {
1.88      albertel 3637:     my ($cdom,$cname,$newchat)=@_;
                   3638:     my %hash;
                   3639:     my $proname=&propath($cdom,$cname);
                   3640:     my @entries=();
1.142     www      3641:     my $time=time;
1.88      albertel 3642:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   3643: 	    &GDBM_WRCREAT(),0640)) {
                   3644: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   3645: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
                   3646: 	my ($thentime,$idnum)=split(/\_/,$lastid);
                   3647: 	my $newid=$time.'_000000';
                   3648: 	if ($thentime==$time) {
                   3649: 	    $idnum=~s/^0+//;
                   3650: 	    $idnum++;
                   3651: 	    $idnum=substr('000000'.$idnum,-6,6);
                   3652: 	    $newid=$time.'_'.$idnum;
                   3653: 	}
                   3654: 	$hash{$newid}=$newchat;
                   3655: 	my $expired=$time-3600;
                   3656: 	foreach (keys %hash) {
                   3657: 	    my ($thistime)=($_=~/(\d+)\_/);
                   3658: 	    if ($thistime<$expired) {
1.89      www      3659: 		delete $hash{$_};
1.88      albertel 3660: 	    }
                   3661: 	}
                   3662: 	untie %hash;
1.142     www      3663:     }
                   3664:     {
                   3665: 	my $hfh;
                   3666: 	if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 
                   3667: 	    print $hfh "$time:".&unescape($newchat)."\n";
                   3668: 	}
1.86      www      3669:     }
1.84      albertel 3670: }
                   3671: 
                   3672: sub unsub {
                   3673:     my ($fname,$clientip)=@_;
                   3674:     my $result;
1.188     foxr     3675:     my $unsubs = 0;		# Number of successful unsubscribes:
                   3676: 
                   3677: 
                   3678:     # An old way subscriptions were handled was to have a 
                   3679:     # subscription marker file:
                   3680: 
                   3681:     Debug("Attempting unlink of $fname.$clientname");
1.161     foxr     3682:     if (unlink("$fname.$clientname")) {
1.188     foxr     3683: 	$unsubs++;		# Successful unsub via marker file.
                   3684:     } 
                   3685: 
                   3686:     # The more modern way to do it is to have a subscription list
                   3687:     # file:
                   3688: 
1.84      albertel 3689:     if (-e "$fname.subscription") {
1.161     foxr     3690: 	my $found=&addline($fname,$clientname,$clientip,'');
1.188     foxr     3691: 	if ($found) { 
                   3692: 	    $unsubs++;
                   3693: 	}
                   3694:     } 
                   3695: 
                   3696:     #  If either or both of these mechanisms succeeded in unsubscribing a 
                   3697:     #  resource we can return ok:
                   3698: 
                   3699:     if($unsubs) {
                   3700: 	$result = "ok\n";
1.84      albertel 3701:     } else {
1.188     foxr     3702: 	$result = "not_subscribed\n";
1.84      albertel 3703:     }
1.188     foxr     3704: 
1.84      albertel 3705:     return $result;
                   3706: }
                   3707: 
1.101     www      3708: sub currentversion {
                   3709:     my $fname=shift;
                   3710:     my $version=-1;
                   3711:     my $ulsdir='';
                   3712:     if ($fname=~/^(.+)\/[^\/]+$/) {
                   3713:        $ulsdir=$1;
                   3714:     }
1.114     albertel 3715:     my ($fnamere1,$fnamere2);
                   3716:     # remove version if already specified
1.101     www      3717:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114     albertel 3718:     # get the bits that go before and after the version number
                   3719:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
                   3720: 	$fnamere1=$1;
                   3721: 	$fnamere2='.'.$2;
                   3722:     }
1.101     www      3723:     if (-e $fname) { $version=1; }
                   3724:     if (-e $ulsdir) {
1.134     albertel 3725: 	if(-d $ulsdir) {
                   3726: 	    if (opendir(LSDIR,$ulsdir)) {
                   3727: 		my $ulsfn;
                   3728: 		while ($ulsfn=readdir(LSDIR)) {
1.101     www      3729: # see if this is a regular file (ignore links produced earlier)
1.134     albertel 3730: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
                   3731: 		    unless (-l $thisfile) {
1.160     www      3732: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134     albertel 3733: 			    if ($1>$version) { $version=$1; }
                   3734: 			}
                   3735: 		    }
                   3736: 		}
                   3737: 		closedir(LSDIR);
                   3738: 		$version++;
                   3739: 	    }
                   3740: 	}
                   3741:     }
                   3742:     return $version;
1.101     www      3743: }
                   3744: 
                   3745: sub thisversion {
                   3746:     my $fname=shift;
                   3747:     my $version=-1;
                   3748:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
                   3749: 	$version=$1;
                   3750:     }
                   3751:     return $version;
                   3752: }
                   3753: 
1.84      albertel 3754: sub subscribe {
                   3755:     my ($userinput,$clientip)=@_;
                   3756:     my $result;
                   3757:     my ($cmd,$fname)=split(/:/,$userinput);
                   3758:     my $ownership=&ishome($fname);
                   3759:     if ($ownership eq 'owner') {
1.101     www      3760: # explitly asking for the current version?
                   3761:         unless (-e $fname) {
                   3762:             my $currentversion=&currentversion($fname);
                   3763: 	    if (&thisversion($fname)==$currentversion) {
                   3764:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
                   3765: 		    my $root=$1;
                   3766:                     my $extension=$2;
                   3767:                     symlink($root.'.'.$extension,
                   3768:                             $root.'.'.$currentversion.'.'.$extension);
1.102     www      3769:                     unless ($extension=~/\.meta$/) {
                   3770:                        symlink($root.'.'.$extension.'.meta',
                   3771:                             $root.'.'.$currentversion.'.'.$extension.'.meta');
                   3772: 		    }
1.101     www      3773:                 }
                   3774:             }
                   3775:         }
1.84      albertel 3776: 	if (-e $fname) {
                   3777: 	    if (-d $fname) {
                   3778: 		$result="directory\n";
                   3779: 	    } else {
1.161     foxr     3780: 		if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134     albertel 3781: 		my $now=time;
1.161     foxr     3782: 		my $found=&addline($fname,$clientname,$clientip,
                   3783: 				   "$clientname:$clientip:$now\n");
1.84      albertel 3784: 		if ($found) { $result="$fname\n"; }
                   3785: 		# if they were subscribed to only meta data, delete that
                   3786:                 # subscription, when you subscribe to a file you also get
                   3787:                 # the metadata
                   3788: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
                   3789: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
                   3790: 		$fname="http://$thisserver/".$fname;
                   3791: 		$result="$fname\n";
                   3792: 	    }
                   3793: 	} else {
                   3794: 	    $result="not_found\n";
                   3795: 	}
                   3796:     } else {
                   3797: 	$result="rejected\n";
                   3798:     }
                   3799:     return $result;
                   3800: }
1.91      albertel 3801: 
                   3802: sub make_passwd_file {
1.98      foxr     3803:     my ($uname, $umode,$npass,$passfilename)=@_;
1.91      albertel 3804:     my $result="ok\n";
                   3805:     if ($umode eq 'krb4' or $umode eq 'krb5') {
                   3806: 	{
                   3807: 	    my $pf = IO::File->new(">$passfilename");
                   3808: 	    print $pf "$umode:$npass\n";
                   3809: 	}
                   3810:     } elsif ($umode eq 'internal') {
                   3811: 	my $salt=time;
                   3812: 	$salt=substr($salt,6,2);
                   3813: 	my $ncpass=crypt($npass,$salt);
                   3814: 	{
                   3815: 	    &Debug("Creating internal auth");
                   3816: 	    my $pf = IO::File->new(">$passfilename");
                   3817: 	    print $pf "internal:$ncpass\n"; 
                   3818: 	}
                   3819:     } elsif ($umode eq 'localauth') {
                   3820: 	{
                   3821: 	    my $pf = IO::File->new(">$passfilename");
                   3822: 	    print $pf "localauth:$npass\n";
                   3823: 	}
                   3824:     } elsif ($umode eq 'unix') {
                   3825: 	{
1.186     foxr     3826: 	    #
                   3827: 	    #  Don't allow the creation of privileged accounts!!! that would
                   3828: 	    #  be real bad!!!
                   3829: 	    #
                   3830: 	    my $uid = getpwnam($uname);
                   3831: 	    if((defined $uid) && ($uid == 0)) {
                   3832: 		&logthis(">>>Attempted to create privilged account blocked");
                   3833: 		return "no_priv_account_error\n";
                   3834: 	    }
                   3835: 
1.91      albertel 3836: 	    my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
                   3837: 	    {
                   3838: 		&Debug("Executing external: ".$execpath);
1.98      foxr     3839: 		&Debug("user  = ".$uname.", Password =". $npass);
1.132     matthew  3840: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91      albertel 3841: 		print $se "$uname\n";
                   3842: 		print $se "$npass\n";
                   3843: 		print $se "$npass\n";
1.97      foxr     3844: 	    }
                   3845: 	    my $useraddok = $?;
                   3846: 	    if($useraddok > 0) {
                   3847: 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
1.91      albertel 3848: 	    }
                   3849: 	    my $pf = IO::File->new(">$passfilename");
                   3850: 	    print $pf "unix:\n";
                   3851: 	}
                   3852:     } elsif ($umode eq 'none') {
                   3853: 	{
                   3854: 	    my $pf = IO::File->new(">$passfilename");
                   3855: 	    print $pf "none:\n";
                   3856: 	}
                   3857:     } else {
                   3858: 	$result="auth_mode_error\n";
                   3859:     }
                   3860:     return $result;
1.121     albertel 3861: }
                   3862: 
                   3863: sub sethost {
                   3864:     my ($remotereq) = @_;
                   3865:     my (undef,$hostid)=split(/:/,$remotereq);
                   3866:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
                   3867:     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
1.200     matthew  3868: 	$currenthostid  =$hostid;
1.121     albertel 3869: 	$currentdomainid=$hostdom{$hostid};
                   3870: 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
                   3871:     } else {
                   3872: 	&logthis("Requested host id $hostid not an alias of ".
                   3873: 		 $perlvar{'lonHostID'}." refusing connection");
                   3874: 	return 'unable_to_set';
                   3875:     }
                   3876:     return 'ok';
                   3877: }
                   3878: 
                   3879: sub version {
                   3880:     my ($userinput)=@_;
                   3881:     $remoteVERSION=(split(/:/,$userinput))[1];
                   3882:     return "version:$VERSION";
1.127     albertel 3883: }
1.178     foxr     3884: 
1.128     albertel 3885: #There is a copy of this in lonnet.pm
1.127     albertel 3886: sub userload {
                   3887:     my $numusers=0;
                   3888:     {
                   3889: 	opendir(LONIDS,$perlvar{'lonIDsDir'});
                   3890: 	my $filename;
                   3891: 	my $curtime=time;
                   3892: 	while ($filename=readdir(LONIDS)) {
                   3893: 	    if ($filename eq '.' || $filename eq '..') {next;}
1.138     albertel 3894: 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159     albertel 3895: 	    if ($curtime-$mtime < 1800) { $numusers++; }
1.127     albertel 3896: 	}
                   3897: 	closedir(LONIDS);
                   3898:     }
                   3899:     my $userloadpercent=0;
                   3900:     my $maxuserload=$perlvar{'lonUserLoadLim'};
                   3901:     if ($maxuserload) {
1.129     albertel 3902: 	$userloadpercent=100*$numusers/$maxuserload;
1.127     albertel 3903:     }
1.130     albertel 3904:     $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127     albertel 3905:     return $userloadpercent;
1.91      albertel 3906: }
                   3907: 
1.205     raeburn  3908: # Routines for serializing arrays and hashes (copies from lonnet)
                   3909: 
                   3910: sub array2str {
                   3911:   my (@array) = @_;
                   3912:   my $result=&arrayref2str(\@array);
                   3913:   $result=~s/^__ARRAY_REF__//;
                   3914:   $result=~s/__END_ARRAY_REF__$//;
                   3915:   return $result;
                   3916: }
                   3917:                                                                                  
                   3918: sub arrayref2str {
                   3919:   my ($arrayref) = @_;
                   3920:   my $result='__ARRAY_REF__';
                   3921:   foreach my $elem (@$arrayref) {
                   3922:     if(ref($elem) eq 'ARRAY') {
                   3923:       $result.=&arrayref2str($elem).'&';
                   3924:     } elsif(ref($elem) eq 'HASH') {
                   3925:       $result.=&hashref2str($elem).'&';
                   3926:     } elsif(ref($elem)) {
                   3927:       #print("Got a ref of ".(ref($elem))." skipping.");
                   3928:     } else {
                   3929:       $result.=&escape($elem).'&';
                   3930:     }
                   3931:   }
                   3932:   $result=~s/\&$//;
                   3933:   $result .= '__END_ARRAY_REF__';
                   3934:   return $result;
                   3935: }
                   3936:                                                                                  
                   3937: sub hash2str {
                   3938:   my (%hash) = @_;
                   3939:   my $result=&hashref2str(\%hash);
                   3940:   $result=~s/^__HASH_REF__//;
                   3941:   $result=~s/__END_HASH_REF__$//;
                   3942:   return $result;
                   3943: }
                   3944:                                                                                  
                   3945: sub hashref2str {
                   3946:   my ($hashref)=@_;
                   3947:   my $result='__HASH_REF__';
                   3948:   foreach (sort(keys(%$hashref))) {
                   3949:     if (ref($_) eq 'ARRAY') {
                   3950:       $result.=&arrayref2str($_).'=';
                   3951:     } elsif (ref($_) eq 'HASH') {
                   3952:       $result.=&hashref2str($_).'=';
                   3953:     } elsif (ref($_)) {
                   3954:       $result.='=';
                   3955:       #print("Got a ref of ".(ref($_))." skipping.");
                   3956:     } else {
                   3957:         if ($_) {$result.=&escape($_).'=';} else { last; }
                   3958:     }
                   3959: 
                   3960:     if(ref($hashref->{$_}) eq 'ARRAY') {
                   3961:       $result.=&arrayref2str($hashref->{$_}).'&';
                   3962:     } elsif(ref($hashref->{$_}) eq 'HASH') {
                   3963:       $result.=&hashref2str($hashref->{$_}).'&';
                   3964:     } elsif(ref($hashref->{$_})) {
                   3965:        $result.='&';
                   3966:       #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
                   3967:     } else {
                   3968:       $result.=&escape($hashref->{$_}).'&';
                   3969:     }
                   3970:   }
                   3971:   $result=~s/\&$//;
                   3972:   $result .= '__END_HASH_REF__';
                   3973:   return $result;
                   3974: }
1.200     matthew  3975: 
1.61      harris41 3976: # ----------------------------------- POD (plain old documentation, CPAN style)
                   3977: 
                   3978: =head1 NAME
                   3979: 
                   3980: lond - "LON Daemon" Server (port "LOND" 5663)
                   3981: 
                   3982: =head1 SYNOPSIS
                   3983: 
1.74      harris41 3984: Usage: B<lond>
                   3985: 
                   3986: Should only be run as user=www.  This is a command-line script which
                   3987: is invoked by B<loncron>.  There is no expectation that a typical user
                   3988: will manually start B<lond> from the command-line.  (In other words,
                   3989: DO NOT START B<lond> YOURSELF.)
1.61      harris41 3990: 
                   3991: =head1 DESCRIPTION
                   3992: 
1.74      harris41 3993: There are two characteristics associated with the running of B<lond>,
                   3994: PROCESS MANAGEMENT (starting, stopping, handling child processes)
                   3995: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
                   3996: subscriptions, etc).  These are described in two large
                   3997: sections below.
                   3998: 
                   3999: B<PROCESS MANAGEMENT>
                   4000: 
1.61      harris41 4001: Preforker - server who forks first. Runs as a daemon. HUPs.
                   4002: Uses IDEA encryption
                   4003: 
1.74      harris41 4004: B<lond> forks off children processes that correspond to the other servers
                   4005: in the network.  Management of these processes can be done at the
                   4006: parent process level or the child process level.
                   4007: 
                   4008: B<logs/lond.log> is the location of log messages.
                   4009: 
                   4010: The process management is now explained in terms of linux shell commands,
                   4011: subroutines internal to this code, and signal assignments:
                   4012: 
                   4013: =over 4
                   4014: 
                   4015: =item *
                   4016: 
                   4017: PID is stored in B<logs/lond.pid>
                   4018: 
                   4019: This is the process id number of the parent B<lond> process.
                   4020: 
                   4021: =item *
                   4022: 
                   4023: SIGTERM and SIGINT
                   4024: 
                   4025: Parent signal assignment:
                   4026:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   4027: 
                   4028: Child signal assignment:
                   4029:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
                   4030: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
                   4031:  to restart a new child.)
                   4032: 
                   4033: Command-line invocations:
                   4034:  B<kill> B<-s> SIGTERM I<PID>
                   4035:  B<kill> B<-s> SIGINT I<PID>
                   4036: 
                   4037: Subroutine B<HUNTSMAN>:
                   4038:  This is only invoked for the B<lond> parent I<PID>.
                   4039: This kills all the children, and then the parent.
                   4040: The B<lonc.pid> file is cleared.
                   4041: 
                   4042: =item *
                   4043: 
                   4044: SIGHUP
                   4045: 
                   4046: Current bug:
                   4047:  This signal can only be processed the first time
                   4048: on the parent process.  Subsequent SIGHUP signals
                   4049: have no effect.
                   4050: 
                   4051: Parent signal assignment:
                   4052:  $SIG{HUP}  = \&HUPSMAN;
                   4053: 
                   4054: Child signal assignment:
                   4055:  none (nothing happens)
                   4056: 
                   4057: Command-line invocations:
                   4058:  B<kill> B<-s> SIGHUP I<PID>
                   4059: 
                   4060: Subroutine B<HUPSMAN>:
                   4061:  This is only invoked for the B<lond> parent I<PID>,
                   4062: This kills all the children, and then the parent.
                   4063: The B<lond.pid> file is cleared.
                   4064: 
                   4065: =item *
                   4066: 
                   4067: SIGUSR1
                   4068: 
                   4069: Parent signal assignment:
                   4070:  $SIG{USR1} = \&USRMAN;
                   4071: 
                   4072: Child signal assignment:
                   4073:  $SIG{USR1}= \&logstatus;
                   4074: 
                   4075: Command-line invocations:
                   4076:  B<kill> B<-s> SIGUSR1 I<PID>
                   4077: 
                   4078: Subroutine B<USRMAN>:
                   4079:  When invoked for the B<lond> parent I<PID>,
                   4080: SIGUSR1 is sent to all the children, and the status of
                   4081: each connection is logged.
1.144     foxr     4082: 
                   4083: =item *
                   4084: 
                   4085: SIGUSR2
                   4086: 
                   4087: Parent Signal assignment:
                   4088:     $SIG{USR2} = \&UpdateHosts
                   4089: 
                   4090: Child signal assignment:
                   4091:     NONE
                   4092: 
1.74      harris41 4093: 
                   4094: =item *
                   4095: 
                   4096: SIGCHLD
                   4097: 
                   4098: Parent signal assignment:
                   4099:  $SIG{CHLD} = \&REAPER;
                   4100: 
                   4101: Child signal assignment:
                   4102:  none
                   4103: 
                   4104: Command-line invocations:
                   4105:  B<kill> B<-s> SIGCHLD I<PID>
                   4106: 
                   4107: Subroutine B<REAPER>:
                   4108:  This is only invoked for the B<lond> parent I<PID>.
                   4109: Information pertaining to the child is removed.
                   4110: The socket port is cleaned up.
                   4111: 
                   4112: =back
                   4113: 
                   4114: B<SERVER-SIDE ACTIVITIES>
                   4115: 
                   4116: Server-side information can be accepted in an encrypted or non-encrypted
                   4117: method.
                   4118: 
                   4119: =over 4
                   4120: 
                   4121: =item ping
                   4122: 
                   4123: Query a client in the hosts.tab table; "Are you there?"
                   4124: 
                   4125: =item pong
                   4126: 
                   4127: Respond to a ping query.
                   4128: 
                   4129: =item ekey
                   4130: 
                   4131: Read in encrypted key, make cipher.  Respond with a buildkey.
                   4132: 
                   4133: =item load
                   4134: 
                   4135: Respond with CPU load based on a computation upon /proc/loadavg.
                   4136: 
                   4137: =item currentauth
                   4138: 
                   4139: Reply with current authentication information (only over an
                   4140: encrypted channel).
                   4141: 
                   4142: =item auth
                   4143: 
                   4144: Only over an encrypted channel, reply as to whether a user's
                   4145: authentication information can be validated.
                   4146: 
                   4147: =item passwd
                   4148: 
                   4149: Allow for a password to be set.
                   4150: 
                   4151: =item makeuser
                   4152: 
                   4153: Make a user.
                   4154: 
                   4155: =item passwd
                   4156: 
                   4157: Allow for authentication mechanism and password to be changed.
                   4158: 
                   4159: =item home
1.61      harris41 4160: 
1.74      harris41 4161: Respond to a question "are you the home for a given user?"
                   4162: 
                   4163: =item update
                   4164: 
                   4165: Update contents of a subscribed resource.
                   4166: 
                   4167: =item unsubscribe
                   4168: 
                   4169: The server is unsubscribing from a resource.
                   4170: 
                   4171: =item subscribe
                   4172: 
                   4173: The server is subscribing to a resource.
                   4174: 
                   4175: =item log
                   4176: 
                   4177: Place in B<logs/lond.log>
                   4178: 
                   4179: =item put
                   4180: 
                   4181: stores hash in namespace
                   4182: 
                   4183: =item rolesput
                   4184: 
                   4185: put a role into a user's environment
                   4186: 
                   4187: =item get
                   4188: 
                   4189: returns hash with keys from array
                   4190: reference filled in from namespace
                   4191: 
                   4192: =item eget
                   4193: 
                   4194: returns hash with keys from array
                   4195: reference filled in from namesp (encrypts the return communication)
                   4196: 
                   4197: =item rolesget
                   4198: 
                   4199: get a role from a user's environment
                   4200: 
                   4201: =item del
                   4202: 
                   4203: deletes keys out of array from namespace
                   4204: 
                   4205: =item keys
                   4206: 
                   4207: returns namespace keys
                   4208: 
                   4209: =item dump
                   4210: 
                   4211: dumps the complete (or key matching regexp) namespace into a hash
                   4212: 
                   4213: =item store
                   4214: 
                   4215: stores hash permanently
                   4216: for this url; hashref needs to be given and should be a \%hashname; the
                   4217: remaining args aren't required and if they aren't passed or are '' they will
                   4218: be derived from the ENV
                   4219: 
                   4220: =item restore
                   4221: 
                   4222: returns a hash for a given url
                   4223: 
                   4224: =item querysend
                   4225: 
                   4226: Tells client about the lonsql process that has been launched in response
                   4227: to a sent query.
                   4228: 
                   4229: =item queryreply
                   4230: 
                   4231: Accept information from lonsql and make appropriate storage in temporary
                   4232: file space.
                   4233: 
                   4234: =item idput
                   4235: 
                   4236: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
                   4237: for each student, defined perhaps by the institutional Registrar.)
                   4238: 
                   4239: =item idget
                   4240: 
                   4241: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
                   4242: for each student, defined perhaps by the institutional Registrar.)
                   4243: 
                   4244: =item tmpput
                   4245: 
                   4246: Accept and store information in temporary space.
                   4247: 
                   4248: =item tmpget
                   4249: 
                   4250: Send along temporarily stored information.
                   4251: 
                   4252: =item ls
                   4253: 
                   4254: List part of a user's directory.
                   4255: 
1.135     foxr     4256: =item pushtable
                   4257: 
                   4258: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
                   4259: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
                   4260: must be restored manually in case of a problem with the new table file.
                   4261: pushtable requires that the request be encrypted and validated via
                   4262: ValidateManager.  The form of the command is:
                   4263: enc:pushtable tablename <tablecontents> \n
                   4264: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
                   4265: cleartext newline.
                   4266: 
1.74      harris41 4267: =item Hanging up (exit or init)
                   4268: 
                   4269: What to do when a client tells the server that they (the client)
                   4270: are leaving the network.
                   4271: 
                   4272: =item unknown command
                   4273: 
                   4274: If B<lond> is sent an unknown command (not in the list above),
                   4275: it replys to the client "unknown_cmd".
1.135     foxr     4276: 
1.74      harris41 4277: 
                   4278: =item UNKNOWN CLIENT
                   4279: 
                   4280: If the anti-spoofing algorithm cannot verify the client,
                   4281: the client is rejected (with a "refused" message sent
                   4282: to the client, and the connection is closed.
                   4283: 
                   4284: =back
1.61      harris41 4285: 
                   4286: =head1 PREREQUISITES
                   4287: 
                   4288: IO::Socket
                   4289: IO::File
                   4290: Apache::File
                   4291: Symbol
                   4292: POSIX
                   4293: Crypt::IDEA
                   4294: LWP::UserAgent()
                   4295: GDBM_File
                   4296: Authen::Krb4
1.91      albertel 4297: Authen::Krb5
1.61      harris41 4298: 
                   4299: =head1 COREQUISITES
                   4300: 
                   4301: =head1 OSNAMES
                   4302: 
                   4303: linux
                   4304: 
                   4305: =head1 SCRIPT CATEGORIES
                   4306: 
                   4307: Server/Process
                   4308: 
                   4309: =cut

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