Annotation of loncom/lond, revision 1.178.2.4

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network
                      3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60      www         4: #
1.178.2.4! albertel    5: # $Id: lond,v 1.178.2.3 2004/02/24 11:22:41 foxr Exp $
1.60      www         6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
1.167     foxr       13: # the Free Software Foundation; either version 2 of the License, or 
1.60      www        14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
1.178.2.1  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;
1.143     foxr       48: use File::Copy;
1.169     foxr       49: use LONCAPA::ConfigFileEdit;
1.1       albertel   50: 
1.178.2.2  foxr       51: my $DEBUG = 1;		       # Non zero to enable debug log entries.
1.77      foxr       52: 
1.57      www        53: my $status='';
                     54: my $lastlog='';
                     55: 
1.178.2.4! albertel   56: my $VERSION='$Revision: 1.178.2.3 $'; #' stupid emacs
1.121     albertel   57: my $remoteVERSION;
1.115     albertel   58: my $currenthostid;
                     59: my $currentdomainid;
1.134     albertel   60: 
                     61: my $client;
1.140     foxr       62: my $clientip;
1.161     foxr       63: my $clientname;
1.140     foxr       64: 
1.178.2.1  foxr       65: my $cipher;			# Cipher key negotiated with client.
                     66: my $tmpsnum = 0;;		# Id of tmpputs.
                     67: 
1.134     albertel   68: my $server;
                     69: my $thisserver;
                     70: 
1.178.2.1  foxr       71: # 
                     72: #   Connection type is:
                     73: #      client                   - All client actions are allowed
                     74: #      manager                  - only management functions allowed.
                     75: #      both                     - Both management and client actions are allowed
                     76: #
                     77: 
                     78: my $ConnectionType;
                     79: 
                     80: my %hostid;
                     81: my %hostdom;
                     82: my %hostip;
                     83: 
                     84: my %managers;			# Ip -> manager names
                     85: 
                     86: my %perlvar;			# Will have the apache conf defined perl vars.
                     87: 
                     88: #
                     89: #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
                     90: #    Each element of the hash contains a reference to an array that contains:
                     91: #          A reference to a sub that executes the request corresponding to the keyword.
                     92: #          A flag that is true if the request must be encoded to be acceptable.
                     93: #          A mask with bits as follows:
                     94: #                      CLIENT_OK    - Set when the function is allowed by ordinary clients
                     95: #                      MANAGER_OK   - Set when the function is allowed to manager clients.
                     96: #
                     97: my $CLIENT_OK  = 1;
                     98: my $MANAGER_OK = 2;
                     99: my %Dispatcher;
                    100: 
                    101: #
                    102: #  The array below are password error strings."
                    103: #
                    104: my $lastpwderror    = 13;		# Largest error number from lcpasswd.
                    105: my @passwderrors = ("ok",
                    106: 		   "lcpasswd must be run as user 'www'",
                    107: 		   "lcpasswd got incorrect number of arguments",
                    108: 		   "lcpasswd did not get the right nubmer of input text lines",
                    109: 		   "lcpasswd too many simultaneous pwd changes in progress",
                    110: 		   "lcpasswd User does not exist.",
                    111: 		   "lcpasswd Incorrect current passwd",
                    112: 		   "lcpasswd Unable to su to root.",
                    113: 		   "lcpasswd Cannot set new passwd.",
                    114: 		   "lcpasswd Username has invalid characters",
                    115: 		   "lcpasswd Invalid characters in password",
                    116: 		    "11", "12",
                    117: 		    "lcpasswd Password mismatch");
                    118: 
                    119: 
                    120: #  The array below are lcuseradd error strings.:
                    121: 
                    122: my $lastadderror = 13;
                    123: my @adderrors    = ("ok",
                    124: 		    "User ID mismatch, lcuseradd must run as user www",
                    125: 		    "lcuseradd Incorrect number of command line parameters must be 3",
                    126: 		    "lcuseradd Incorrect number of stdinput lines, must be 3",
                    127: 		    "lcuseradd Too many other simultaneous pwd changes in progress",
                    128: 		    "lcuseradd User does not exist",
                    129: 		    "lcuseradd Unable to make www member of users's group",
                    130: 		    "lcuseradd Unable to su to root",
                    131: 		    "lcuseradd Unable to set password",
                    132: 		    "lcuseradd Usrname has invalid characters",
                    133: 		    "lcuseradd Password has an invalid character",
                    134: 		    "lcuseradd User already exists",
                    135: 		    "lcuseradd Could not add user.",
                    136: 		    "lcuseradd Password mismatch");
                    137: 
                    138: #
                    139: #   Statistics that are maintained and dislayed in the status line.
                    140: #
                    141: my $Transactions;		# Number of attempted transactions.
                    142: my $Failures;			# Number of transcations failed.
                    143: 
                    144: #   ResetStatistics: 
                    145: #      Resets the statistics counters:
                    146: #
                    147: sub ResetStatistics {
                    148:     $Transactions = 0;
                    149:     $Failures     = 0;
                    150: }
                    151: 
                    152: #
                    153: #   Return true if client is a manager.
                    154: #
                    155: sub isManager {
                    156:     return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
                    157: }
                    158: #
                    159: #   Return tru if client can do client functions
                    160: #
                    161: sub isClient {
                    162:     return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
                    163: }
                    164: 
                    165: 
                    166: #
                    167: #   Get a Request:
                    168: #   Gets a Request message from the client.  The transaction
                    169: #   is defined as a 'line' of text.  We remove the new line
                    170: #   from the text line.  
                    171: #   
                    172: sub GetRequest {
                    173:     my $input = <$client>;
                    174:     chomp($input);
                    175: 
                    176:     Debug("Request = $input\n");
                    177: 
                    178:     &status('Processing '.$clientname.':'.$input);
                    179: 
                    180:     return $input;
                    181: }
                    182: #
                    183: #   Decipher encoded traffic
                    184: #  Parameters:
                    185: #     input      - Encoded data.
                    186: #  Returns:
                    187: #     Decoded data or undef if encryption key was not yet negotiated.
                    188: #  Implicit input:
                    189: #     cipher  - This global holds the negotiated encryption key.
                    190: #
                    191: sub Decipher {
1.178.2.4! albertel  192:     my $input  = shift;
        !           193:     my $output = '';
1.178.2.1  foxr      194:    
                    195:    
1.178.2.4! albertel  196:     if($cipher) {
        !           197: 	my($enc, $enclength, $encinput) = split(/:/, $input);
        !           198: 	for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
        !           199: 	    $output .= 
        !           200: 		$cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
        !           201: 	}
        !           202: 	return substr($output, 0, $enclength);
        !           203:     } else {
        !           204: 	return undef;
        !           205:     }
1.178.2.1  foxr      206: }
                    207: 
                    208: #
                    209: #   Register a command processor.  This function is invoked to register a sub
                    210: #   to process a request.  Once registered, the ProcessRequest sub can automatically
                    211: #   dispatch requests to an appropriate sub, and do the top level validity checking
                    212: #   as well:
                    213: #    - Is the keyword recognized.
                    214: #    - Is the proper client type attempting the request.
                    215: #    - Is the request encrypted if it has to be.
                    216: #   Parameters:
                    217: #    $RequestName         - Name of the request being registered.
                    218: #                           This is the command request that will match
                    219: #                           against the hash keywords to lookup the information
                    220: #                           associated with the dispatch information.
                    221: #    $Procedure           - Reference to a sub to call to process the request.
                    222: #                           All subs get called as follows:
                    223: #                             Procedure($cmd, $tail, $replyfd, $key)
                    224: #                             $cmd    - the actual keyword that invoked us.
                    225: #                             $tail   - the tail of the request that invoked us.
                    226: #                             $replyfd- File descriptor connected to the client
                    227: #    $MustEncode          - True if the request must be encoded to be good.
                    228: #    $ClientOk            - True if it's ok for a client to request this.
                    229: #    $ManagerOk           - True if it's ok for a manager to request this.
                    230: # Side effects:
                    231: #      - On success, the Dispatcher hash has an entry added for the key $RequestName
                    232: #      - On failure, the program will die as it's a bad internal bug to try to 
                    233: #        register a duplicate command handler.
                    234: #
                    235: sub RegisterHandler {
1.178.2.4! albertel  236:     my $RequestName    = shift;
        !           237:     my $Procedure      = shift;
        !           238:     my $MustEncode     = shift;
        !           239:     my $ClientOk       = shift;
        !           240:     my $ManagerOk      = shift;
        !           241:    
        !           242:     #  Don't allow duplication#
1.178.2.1  foxr      243:    
1.178.2.4! albertel  244:     if (defined $Dispatcher{$RequestName}) {
        !           245: 	die "Attempting to define a duplicate request handler for $RequestName\n";
        !           246:     }
        !           247:     #   Build the client type mask:
        !           248:     
        !           249:     my $ClientTypeMask = 0;
        !           250:     if($ClientOk) {
        !           251: 	$ClientTypeMask  |= $CLIENT_OK;
        !           252:     }
        !           253:     if($ManagerOk) {
        !           254: 	$ClientTypeMask  |= $MANAGER_OK;
        !           255:     }
        !           256:    
        !           257:     #  Enter the hash:
1.178.2.1  foxr      258:       
1.178.2.4! albertel  259:     my @entry = ($Procedure, $MustEncode, $ClientTypeMask);
1.178.2.1  foxr      260:    
1.178.2.4! albertel  261:     $Dispatcher{$RequestName} = \@entry;
1.178.2.1  foxr      262:    
                    263:    
                    264: }
                    265: 
                    266: #--------------------- Request Handlers --------------------------------------------
                    267: #
                    268: #   By convention each request handler registers itself prior to the sub declaration:
                    269: #
                    270: 
                    271: #  Handles ping requests.
                    272: #  Parameters:
                    273: #      $cmd    - the actual keyword that invoked us.
                    274: #      $tail   - the tail of the request that invoked us.
                    275: #      $replyfd- File descriptor connected to the client
                    276: #  Implicit Inputs:
                    277: #      $currenthostid - Global variable that carries the name of the host we are
                    278: #                       known as.
                    279: #  Returns:
                    280: #      1       - Ok to continue processing.
                    281: #      0       - Program should exit.
                    282: #  Side effects:
                    283: #      Reply information is sent to the client.
                    284: 
                    285: sub PingHandler {
1.178.2.4! albertel  286:     my $cmd    = shift;
        !           287:     my $tail   = shift;
        !           288:     my $client = shift;
1.178.2.1  foxr      289:    
1.178.2.4! albertel  290:     Reply( $client,"$currenthostid\n","$cmd:$tail");
1.178.2.1  foxr      291:    
1.178.2.4! albertel  292:     return 1;
1.178.2.1  foxr      293: }
                    294: RegisterHandler("ping", \&PingHandler, 0, 1, 1);       # Ping unencoded, client or manager.
                    295: #
                    296: # Handles pong reequests:
                    297: # Parameters:
                    298: #      $cmd    - the actual keyword that invoked us.
                    299: #      $tail   - the tail of the request that invoked us.
                    300: #      $replyfd- File descriptor connected to the client
                    301: #  Implicit Inputs:
                    302: #      $currenthostid - Global variable that carries the name of the host we are
                    303: #                       connected to.
                    304: #  Returns:
                    305: #      1       - Ok to continue processing.
                    306: #      0       - Program should exit.
                    307: #  Side effects:
                    308: #      Reply information is sent to the client.
                    309: 
                    310: sub PongHandler {
1.178.2.4! albertel  311:     my $cmd     = shift;
        !           312:     my $tail    = shift;
        !           313:     my $replyfd = shift;
        !           314: 
        !           315:     my $reply=&reply("ping",$clientname);
        !           316:     Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
        !           317:     return 1;
1.178.2.1  foxr      318: }
                    319: RegisterHandler("pong", \&PongHandler, 0, 1, 1);       # Pong unencoded, client or manager
                    320: 
                    321: #
                    322: #   EstablishKeyHandler:
                    323: #      Called to establish an encrypted session key with the remote client.
                    324: #
                    325: # Parameters:
                    326: #      $cmd    - the actual keyword that invoked us.
                    327: #      $tail   - the tail of the request that invoked us.
                    328: #      $replyfd- File descriptor connected to the client
                    329: #  Implicit Inputs:
                    330: #      $currenthostid - Global variable that carries the name of the host
                    331: #                       known as.
                    332: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
                    333: #  Returns:
                    334: #      1       - Ok to continue processing.
                    335: #      0       - Program should exit.
                    336: #  Implicit Outputs:
                    337: #      Reply information is sent to the client.
                    338: #      $cipher is set with a reference to a new IDEA encryption object.
                    339: #
                    340: sub EstablishKeyHandler {
1.178.2.4! albertel  341:     my $cmd      = shift;
        !           342:     my $tail     = shift;
        !           343:     my $replyfd  = shift;
        !           344: 
        !           345:     my $buildkey=time.$$.int(rand 100000);
        !           346:     $buildkey=~tr/1-6/A-F/;
        !           347:     $buildkey=int(rand 100000).$buildkey.int(rand 100000);
        !           348:     my $key=$currenthostid.$clientname;
        !           349:     $key=~tr/a-z/A-Z/;
        !           350:     $key=~tr/G-P/0-9/;
        !           351:     $key=~tr/Q-Z/0-9/;
        !           352:     $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
        !           353:     $key=substr($key,0,32);
        !           354:     my $cipherkey=pack("H32",$key);
        !           355:     $cipher=new IDEA $cipherkey;
        !           356:     Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 
1.178.2.1  foxr      357:    
1.178.2.4! albertel  358:     return 1;
1.178.2.1  foxr      359: 
                    360: }
                    361: RegisterHandler("ekey", \&EstablishKeyHandler, 0, 1,1);
                    362: 
                    363: #  LoadHandler:
                    364: #     Handler for the load command.  Returns the current system load average
                    365: #     to the requestor.
                    366: #
                    367: # Parameters:
                    368: #      $cmd    - the actual keyword that invoked us.
                    369: #      $tail   - the tail of the request that invoked us.
                    370: #      $replyfd- File descriptor connected to the client
                    371: #  Implicit Inputs:
                    372: #      $currenthostid - Global variable that carries the name of the host
                    373: #                       known as.
                    374: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
                    375: #  Returns:
                    376: #      1       - Ok to continue processing.
                    377: #      0       - Program should exit.
                    378: #  Side effects:
                    379: #      Reply information is sent to the client.
                    380: sub LoadHandler {
1.178.2.4! albertel  381:     my $cmd     = shift;
        !           382:     my $tail    = shift;
        !           383:     my $replyfd = shift;
1.178.2.1  foxr      384: 
                    385:    # Get the load average from /proc/loadavg and calculate it as a percentage of
                    386:    # the allowed load limit as set by the perl global variable lonLoadLim
                    387: 
1.178.2.4! albertel  388:     my $loadavg;
        !           389:     my $loadfile=IO::File->new('/proc/loadavg');
1.178.2.1  foxr      390:    
1.178.2.4! albertel  391:     $loadavg=<$loadfile>;
        !           392:     $loadavg =~ s/\s.*//g;                      # Extract the first field only.
1.178.2.1  foxr      393:    
1.178.2.4! albertel  394:     my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1.178.2.1  foxr      395: 
1.178.2.4! albertel  396:     Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
1.178.2.1  foxr      397:    
1.178.2.4! albertel  398:     return 1;
1.178.2.1  foxr      399: }
                    400: RegisterHandler("load", \&LoadHandler, 0, 1, 0);
                    401: 
                    402: 
                    403: #
                    404: #   Process the userload request.  This sub returns to the client the current
                    405: #  user load average.  It can be invoked either by clients or managers.
                    406: #
                    407: # Parameters:
                    408: #      $cmd    - the actual keyword that invoked us.
                    409: #      $tail   - the tail of the request that invoked us.
                    410: #      $replyfd- File descriptor connected to the client
                    411: #  Implicit Inputs:
                    412: #      $currenthostid - Global variable that carries the name of the host
                    413: #                       known as.
                    414: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
                    415: #  Returns:
                    416: #      1       - Ok to continue processing.
                    417: #      0       - Program should exit
                    418: # Implicit inputs:
                    419: #     whatever the userload() function requires.
                    420: #  Implicit outputs:
                    421: #     the reply is written to the client.
                    422: #
                    423: sub UserLoadHandler {
1.178.2.4! albertel  424:     my $cmd     = shift;
        !           425:     my $tail    = shift;
        !           426:     my $replyfd = shift;
1.178.2.1  foxr      427: 
1.178.2.4! albertel  428:     my $userloadpercent=&userload();
        !           429:     Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
        !           430:     
        !           431:     return 1;
1.178.2.1  foxr      432: }
                    433: RegisterHandler("userload", \&UserLoadHandler, 0, 1, 0);
                    434: 
                    435: #   Process a request for the authorization type of a user:
                    436: #   (userauth).
                    437: #
                    438: # Parameters:
                    439: #      $cmd    - the actual keyword that invoked us.
                    440: #      $tail   - the tail of the request that invoked us.
                    441: #      $replyfd- File descriptor connected to the client
                    442: #  Returns:
                    443: #      1       - Ok to continue processing.
                    444: #      0       - Program should exit
                    445: # Implicit outputs:
                    446: #    The user authorization type is written to the client.
                    447: #
                    448: sub UserAuthorizationType {
1.178.2.4! albertel  449:     my $cmd     = shift;
        !           450:     my $tail    = shift;
        !           451:     my $replyfd = shift;
        !           452:    
        !           453:     my $userinput = "$cmd:$tail";
        !           454:    
        !           455:     #  Pull the domain and username out of the command tail.
        !           456:     # and call GetAuthType to determine the authentication type.
        !           457:    
        !           458:     my ($udom,$uname)=split(/:/,$tail);
        !           459:     my $result = GetAuthType($udom, $uname);
        !           460:     if($result eq "nouser") {
        !           461: 	Failure( $replyfd, "unknown_user\n", $userinput);
        !           462:     } else {
        !           463: 	Reply( $replyfd, "$result\n", $userinput);
        !           464:     }
1.178.2.1  foxr      465:   
1.178.2.4! albertel  466:     return 1;
1.178.2.1  foxr      467: }
                    468: RegisterHandler("currentauth", \&UserAuthorizationType, 1, 1, 0);
                    469: #
                    470: #   Process a request by a manager to push a hosts or domain table 
                    471: #   to us.  We pick apart the command and pass it on to the subs
                    472: #   that already exist to do this.
                    473: #
                    474: # Parameters:
                    475: #      $cmd    - the actual keyword that invoked us.
                    476: #      $tail   - the tail of the request that invoked us.
                    477: #      $client - File descriptor connected to the client
                    478: #  Returns:
                    479: #      1       - Ok to continue processing.
                    480: #      0       - Program should exit
                    481: # Implicit Output:
                    482: #    a reply is written to the client.
                    483: 
                    484: sub PushFileHandler {
1.178.2.4! albertel  485:     my $cmd    = shift;
        !           486:     my $tail   = shift;
        !           487:     my $client = shift;
1.178.2.1  foxr      488: 
1.178.2.4! albertel  489:     my $userinput = "$cmd:$tail";
1.178.2.1  foxr      490: 
1.178.2.4! albertel  491:     # At this time we only know that the IP of our partner is a valid manager
        !           492:     # the code below is a hook to do further authentication (e.g. to resolve
        !           493:     # spoofing).
1.178.2.1  foxr      494: 
1.178.2.4! albertel  495:     my $cert = GetCertificate($userinput);
        !           496:     if(ValidManager($cert)) { 
1.178.2.1  foxr      497: 
1.178.2.4! albertel  498: 	# Now presumably we have the bona fides of both the peer host and the
        !           499: 	# process making the request.
1.178.2.1  foxr      500:       
1.178.2.4! albertel  501: 	my $reply = PushFile($userinput);
        !           502: 	Reply($client, "$reply\n", $userinput);
1.178.2.1  foxr      503: 
1.178.2.4! albertel  504:     } else {
        !           505: 	Failure( $client, "refused\n", $userinput);
        !           506:     } 
1.178.2.1  foxr      507: }
                    508: RegisterHandler("pushfile", \&PushFileHandler, 1, 0, 1);
                    509: 
                    510: 
                    511: 
                    512: #   Process a reinit request.  Reinit requests that either
                    513: #   lonc or lond be reinitialized so that an updated 
                    514: #   host.tab or domain.tab can be processed.
                    515: #
                    516: # Parameters:
                    517: #      $cmd    - the actual keyword that invoked us.
                    518: #      $tail   - the tail of the request that invoked us.
                    519: #      $client - File descriptor connected to the client
                    520: #  Returns:
                    521: #      1       - Ok to continue processing.
                    522: #      0       - Program should exit
                    523: #  Implicit output:
                    524: #     a reply is sent to the client.
                    525: #
                    526: sub ReinitProcessHandler {
1.178.2.4! albertel  527:     my $cmd    = shift;
        !           528:     my $tail   = shift;
        !           529:     my $client = shift;
        !           530:    
        !           531:     my $userinput = "$cmd:$tail";
        !           532:    
        !           533:     my $cert = GetCertificate($userinput);
        !           534:     if(ValidManager($cert)) {
        !           535: 	chomp($userinput);
        !           536: 	my $reply = ReinitProcess($userinput);
        !           537: 	Reply( $client,  "$reply\n", $userinput);
        !           538:     } else {
        !           539: 	Failure( $client, "refused\n", $userinput);
        !           540:     }
        !           541:     return 1;
1.178.2.1  foxr      542: }
                    543: 
                    544: RegisterHandler("reinit", \&ReinitProcessHandler, 1, 0, 1);
                    545: 
                    546: #  Process the editing script for a table edit operation.
                    547: #  the editing operation must be encrypted and requested by
                    548: #  a manager host.
                    549: #
                    550: # Parameters:
                    551: #      $cmd    - the actual keyword that invoked us.
                    552: #      $tail   - the tail of the request that invoked us.
                    553: #      $client - File descriptor connected to the client
                    554: #  Returns:
                    555: #      1       - Ok to continue processing.
                    556: #      0       - Program should exit
                    557: #  Implicit output:
                    558: #     a reply is sent to the client.
                    559: #
                    560: sub EditTableHandler {
1.178.2.4! albertel  561:     my $command    = shift;
        !           562:     my $tail       = shift;
        !           563:     my $client     = shift;
        !           564:    
        !           565:     my $userinput = "$command:$tail";
        !           566: 
        !           567:     my $cert = GetCertificate($userinput);
        !           568:     if(ValidManager($cert)) {
        !           569: 	my($filetype, $script) = split(/:/, $tail);
        !           570: 	if (($filetype eq "hosts") || 
        !           571: 	    ($filetype eq "domain")) {
        !           572: 	    if($script ne "") {
        !           573: 		Reply($client,              # BUGBUG - EditFile
        !           574: 		      EditFile($userinput), #   could fail.
        !           575: 		      $userinput);
        !           576: 	    } else {
        !           577: 		Failure($client,"refused\n",$userinput);
        !           578: 	    }
        !           579: 	} else {
        !           580: 	    Failure($client,"refused\n",$userinput);
        !           581: 	}
        !           582:     } else {
        !           583: 	Failure($client,"refused\n",$userinput);
        !           584:     }
        !           585:     return 1;
1.178.2.1  foxr      586: }
                    587: RegisterHandler("edit", \&EditTableHandler, 1, 0, 1);
                    588: 
                    589: 
                    590: #
                    591: #   Authenticate a user against the LonCAPA authentication
                    592: #   database.  Note that there are several authentication
                    593: #   possibilities:
                    594: #   - unix     - The user can be authenticated against the unix
                    595: #                password file.
                    596: #   - internal - The user can be authenticated against a purely 
                    597: #                internal per user password file.
                    598: #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
                    599: #                ticket granting authority.
1.178.2.4! albertel  600: #   - user     - The person tailoring LonCAPA can supply a user authentication
        !           601: #                mechanism that is per system.
1.178.2.1  foxr      602: #
                    603: # Parameters:
                    604: #    $cmd      - The command that got us here.
                    605: #    $tail     - Tail of the command (remaining parameters).
                    606: #    $client   - File descriptor connected to client.
                    607: # Returns
                    608: #     0        - Requested to exit, caller should shut down.
                    609: #     1        - Continue processing.
                    610: # Implicit inputs:
                    611: #    The authentication systems describe above have their own forms of implicit
                    612: #    input into the authentication process that are described above.
                    613: #
                    614: sub AuthenticateHandler {
1.178.2.4! albertel  615:     my $cmd        = shift;
        !           616:     my $tail       = shift;
        !           617:     my $client     = shift;
        !           618:    
        !           619:     #  Regenerate the full input line 
        !           620:    
        !           621:     my $userinput  = $cmd.":".$tail;
        !           622: 
        !           623:     #  udom    - User's domain.
        !           624:     #  uname   - Username.
        !           625:     #  upass   - User's password.
        !           626:    
        !           627:     my ($udom,$uname,$upass)=split(/:/,$tail);
        !           628:     Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
        !           629:     chomp($upass);
        !           630:     $upass=unescape($upass);
        !           631:     my $proname=propath($udom,$uname);
        !           632:     my $passfilename="$proname/passwd";
        !           633:    
        !           634:     #   The user's 'personal' loncapa passworrd file describes how to authenticate:
        !           635:    
        !           636:     if (-e $passfilename) {
        !           637: 	Debug("Located password file: $passfilename");
        !           638: 
        !           639: 	my $pf = IO::File->new($passfilename);
        !           640: 	my $realpasswd=<$pf>;
        !           641: 	chomp($realpasswd);
        !           642: 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
        !           643: 	my $pwdcorrect=0;
        !           644: 	#
        !           645: 	#   Authenticate against password stored in the internal file.
        !           646: 	#
        !           647: 	Debug("Authenticating via $howpwd");
        !           648: 	if ($howpwd eq 'internal') {
        !           649: 	    &Debug("Internal auth");
        !           650: 	    $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);
        !           651: 	    #
        !           652: 	    #   Authenticate against the unix password file.
        !           653: 	    #
        !           654: 	} elsif ($howpwd eq 'unix') {
        !           655: 	    &Debug("Unix auth");
        !           656: 	    if((getpwnam($uname))[1] eq "") { #no such user!
        !           657: 		$pwdcorrect = 0;
        !           658: 	    } else {
        !           659: 		$contentpwd=(getpwnam($uname))[1];
        !           660: 		my $pwauth_path="/usr/local/sbin/pwauth";
        !           661: 		unless ($contentpwd eq 'x') {
        !           662: 		    $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);
        !           663: 		} elsif (-e $pwauth_path) {
        !           664: 		    open PWAUTH, "|$pwauth_path" or
        !           665: 			die "Cannot invoke authentication";
        !           666: 		    print PWAUTH "$uname\n$upass\n";
        !           667: 		    close PWAUTH;
        !           668: 		    $pwdcorrect=!$?;
        !           669: 		}
        !           670: 	    }
        !           671: 	    #
        !           672: 	    #   Authenticate against a Kerberos 4 server:
        !           673: 	    #
        !           674: 	} elsif ($howpwd eq 'krb4') {
        !           675: 	    my $null=pack("C",0);
        !           676: 	    unless ($upass=~/$null/) {
        !           677: 		my $krb4_error = &Authen::Krb4::get_pw_in_tkt($uname,
        !           678: 							      "",
        !           679: 							      $contentpwd,
        !           680: 							      'krbtgt',
        !           681: 							      $contentpwd,
        !           682: 							      1,
        !           683: 							      $upass);
        !           684: 		if (!$krb4_error) {
        !           685: 		    $pwdcorrect = 1;
        !           686: 		} else { 
        !           687: 		    $pwdcorrect=0; 
        !           688: 		    # log error if it is not a bad password
        !           689: 		    if ($krb4_error != 62) {
        !           690: 			&logthis('krb4:'.$uname.','.$contentpwd.','.
        !           691: 				 &Authen::Krb4::get_err_txt($Authen::Krb4::error));
        !           692: 		    }
        !           693: 		}
        !           694: 	    }
        !           695: 	    #
        !           696: 	    #   Authenticate against a Kerberos 5 server:
        !           697: 	    #
        !           698: 	} elsif ($howpwd eq 'krb5') {
        !           699: 	    my $null=pack("C",0);
        !           700: 	    unless ($upass=~/$null/) {
        !           701: 		my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
        !           702: 		my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
        !           703: 		my $krbserver=&Authen::Krb5::parse_name($krbservice);
        !           704: 		my $credentials=&Authen::Krb5::cc_default();
        !           705: 		$credentials->initialize($krbclient);
        !           706: 		my $krbreturn = &Authen::Krb5::get_in_tkt_with_password($krbclient,
        !           707: 									$krbserver,
        !           708: 									$upass,
        !           709: 									$credentials);
        !           710: 		$pwdcorrect = ($krbreturn == 1);
        !           711: 	    } else { 
        !           712: 		$pwdcorrect=0; 
        !           713: 	    }
        !           714: 	    #
        !           715: 	    #  Finally, the user may have written in an authentication module.
        !           716: 	    #  in that case, if requested, authenticate against it.
        !           717: 	    #
        !           718: 	} elsif ($howpwd eq 'localauth') {
        !           719: 	    $pwdcorrect=&localauth::localauth($uname,$upass,$contentpwd);
        !           720: 	}
        !           721: 	#
        !           722: 	#   Successfully authorized.
        !           723: 	#
        !           724: 	if ($pwdcorrect) {
        !           725: 	    Reply( $client, "authorized\n", $userinput);
        !           726: 	    #
        !           727: 	    #  Bad credentials: Failed to authorize
        !           728: 	    #
        !           729: 	} else {
        !           730: 	    Failure( $client, "non_authorized\n", $userinput);
        !           731: 	}
        !           732: 	#
        !           733: 	#  User bad... note it may be bad security practice to
        !           734: 	#  differntiate to the caller a bad user from a bad
        !           735: 	#  passwd... since that supplies covert channel information
        !           736: 	#  (you have a good user but bad password e.g.) to guessers.
        !           737: 	#
        !           738:     } else {
        !           739: 	Failure( $client, "unknown_user\n", $userinput);
        !           740:     }
        !           741:     return 1;
1.178.2.1  foxr      742: }
                    743: RegisterHandler("auth", \&AuthenticateHandler, 1, 1, 0);
                    744: 
                    745: #
                    746: #   Change a user's password.  Note that this function is complicated by
                    747: #   the fact that a user may be authenticated in more than one way:
                    748: #   At present, we are not able to change the password for all types of
                    749: #   authentication methods.  Only for:
                    750: #      unix    - unix password or shadow passoword style authentication.
                    751: #      local   - Locally written authentication mechanism.
                    752: #   For now, kerb4 and kerb5 password changes are not supported and result
                    753: #   in an error.
                    754: # FUTURE WORK:
                    755: #    Support kerberos passwd changes?
                    756: # Parameters:
                    757: #    $cmd      - The command that got us here.
                    758: #    $tail     - Tail of the command (remaining parameters).
                    759: #    $client   - File descriptor connected to client.
                    760: # Returns
                    761: #     0        - Requested to exit, caller should shut down.
                    762: #     1        - Continue processing.
                    763: # Implicit inputs:
                    764: #    The authentication systems describe above have their own forms of implicit
                    765: #    input into the authentication process that are described above.
                    766: sub ChangePasswordHandler {
1.178.2.4! albertel  767:     my $cmd     = shift;
        !           768:     my $tail    = shift;
        !           769:     my $client  = shift;
        !           770:    
        !           771:     my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
        !           772: 
        !           773:     #
        !           774:     #  udom  - user's domain.
        !           775:     #  uname - Username.
        !           776:     #  upass - Current password.
        !           777:     #  npass - New password.
        !           778:    
        !           779:     my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
        !           780:     chomp($npass);
        !           781:     $upass=&unescape($upass);
        !           782:     $npass=&unescape($npass);
        !           783:     &Debug("Trying to change password for $uname");
        !           784:     my $proname=propath($udom,$uname);
        !           785:     my $passfilename="$proname/passwd";
        !           786:     if (-e $passfilename) {
        !           787: 	my $realpasswd;
        !           788: 	{ 
        !           789: 	    my $pf = IO::File->new($passfilename);
        !           790: 	    $realpasswd=<$pf>; 
        !           791: 	}
        !           792: 	chomp($realpasswd);
        !           793: 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
        !           794: 	if ($howpwd eq 'internal') {
        !           795: 	    &Debug("internal auth");
        !           796: 	    if (crypt($upass,$contentpwd) eq $contentpwd) {
        !           797: 		my $salt=time;
        !           798: 		$salt=substr($salt,6,2);
        !           799: 		my $ncpass=crypt($npass,$salt);
        !           800: 		{
        !           801: 		    my $pf = IO::File->new(">$passfilename");
        !           802: 		    if ($pf) {
        !           803: 			print $pf "internal:$ncpass\n";
        !           804: 			&logthis("Result of password change for "
        !           805: 				 ."$uname: pwchange_success");
        !           806: 			Reply($client, "ok\n", $userinput);
        !           807: 		    } else {
        !           808: 			&logthis("Unable to open $uname passwd "               
        !           809: 				 ."to change password");
        !           810: 			Failure( $client, "non_authorized\n",$userinput);
        !           811: 		    }
        !           812: 		}             
        !           813: 	    } else {
        !           814: 		Failure($client, "non_authorized\n", $userinput);
        !           815: 	    }
        !           816: 	} elsif ($howpwd eq 'unix') {
        !           817: 	    # Unix means we have to access /etc/password
        !           818: 	    # one way or another.
        !           819: 	    # First: Make sure the current password is
        !           820: 	    #        correct
        !           821: 	    &Debug("auth is unix");
        !           822: 	    $contentpwd=(getpwnam($uname))[1];
        !           823: 	    my $pwdcorrect = "0";
        !           824: 	    my $pwauth_path="/usr/local/sbin/pwauth";
        !           825: 	    unless ($contentpwd eq 'x') {
        !           826: 		$pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);
        !           827: 	    } elsif (-e $pwauth_path) {
        !           828: 		open PWAUTH, "|$pwauth_path" or
        !           829: 		    die "Cannot invoke authentication";
        !           830: 		print PWAUTH "$uname\n$upass\n";
        !           831: 		close PWAUTH;
        !           832: 		&Debug("exited pwauth with $? ($uname,$upass) ");
        !           833: 		$pwdcorrect=($? == 0);
        !           834: 	    }
        !           835: 	    if ($pwdcorrect) {
        !           836: 		my $execdir=$perlvar{'lonDaemons'};
        !           837: 		&Debug("Opening lcpasswd pipeline");
        !           838: 		my $pf = IO::File->new("|$execdir/lcpasswd > "
        !           839: 				       ."$perlvar{'lonDaemons'}"
        !           840: 				       ."/logs/lcpasswd.log");
        !           841: 		print $pf "$uname\n$npass\n$npass\n";
        !           842: 		close $pf;
        !           843: 		my $err = $?;
        !           844: 		my $result = ($err>0 ? 'pwchange_failure' : 'ok');
        !           845: 		&logthis("Result of password change for $uname: ".
        !           846: 			 &lcpasswdstrerror($?));
        !           847: 		Reply($client, "$result\n", $userinput);
        !           848: 	    } else {
        !           849: 		Reply($client, "non_authorized\n", $userinput);
        !           850: 	    }
        !           851: 	} else {
        !           852: 	    Reply( $client, "auth_mode_error\n", $userinput);
        !           853: 	}  
        !           854:     } else {
        !           855: 	Reply( $client, "unknown_user\n", $userinput);
        !           856:     }
        !           857:     return 1;
1.178.2.1  foxr      858: }
                    859: RegisterHandler("passwd", \&ChangePasswordHandler, 1, 1, 0);
                    860: 
                    861: #
                    862: #   Create a new user.  User in this case means a lon-capa user.
                    863: #   The user must either already exist in some authentication realm
                    864: #   like kerberos or the /etc/passwd.  If not, a user completely local to
                    865: #   this loncapa system is created.
                    866: #
                    867: # Parameters:
                    868: #    $cmd      - The command that got us here.
                    869: #    $tail     - Tail of the command (remaining parameters).
                    870: #    $client   - File descriptor connected to client.
                    871: # Returns
                    872: #     0        - Requested to exit, caller should shut down.
                    873: #     1        - Continue processing.
                    874: # Implicit inputs:
                    875: #    The authentication systems describe above have their own forms of implicit
                    876: #    input into the authentication process that are described above.
                    877: sub AddUserHandler {
1.178.2.4! albertel  878:     my $cmd     = shift;
        !           879:     my $tail    = shift;
        !           880:     my $client  = shift;
        !           881:     
        !           882:     my $userinput = $cmd.":".$tail;   
        !           883: 
        !           884:     my $oldumask=umask(0077);
        !           885:     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
        !           886:     &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
        !           887:     chomp($npass);
        !           888:     $npass=&unescape($npass);
        !           889:     my $proname=propath($udom,$uname);
        !           890:     my $passfilename="$proname/passwd";
        !           891:     &Debug("Password file created will be:".$passfilename);
        !           892:     if (-e $passfilename) {
        !           893: 	Failure( $client, "already_exists\n", $userinput);
        !           894:     } elsif ($udom ne $currentdomainid) {
        !           895: 	Failure($client, "not_right_domain\n", $userinput);
        !           896:     } else {
        !           897: 	my @fpparts=split(/\//,$proname);
        !           898: 	my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
        !           899: 	my $fperror='';
        !           900: 	for (my $i=3;$i<=$#fpparts;$i++) {
        !           901: 	    $fpnow.='/'.$fpparts[$i]; 
        !           902: 	    unless (-e $fpnow) {
        !           903: 		unless (mkdir($fpnow,0777)) {
        !           904: 		    $fperror="error: ".($!+0)." mkdir failed while attempting "
        !           905: 			."makeuser";
        !           906: 		}
        !           907: 	    }
        !           908: 	}
        !           909: 	unless ($fperror) {
        !           910: 	    my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
        !           911: 	    Reply($client, $result, $userinput);     #BUGBUG - could be fail
        !           912: 	} else {
        !           913: 	    Failure($client, "$fperror\n", $userinput);
        !           914: 	}
        !           915:     }
        !           916:     umask($oldumask);
        !           917:     return 1;
1.178.2.1  foxr      918: 
                    919: }
                    920: RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0);
                    921: 
                    922: #
                    923: #   Change the authentication method of a user.  Note that this may
                    924: #   also implicitly change the user's password if, for example, the user is
                    925: #   joining an existing authentication realm.  Known authentication realms at
                    926: #   this time are:
                    927: #    internal   - Purely internal password file (only loncapa knows this user)
                    928: #    local      - Institutionally written authentication module.
                    929: #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
                    930: #    kerb4      - kerberos version 4
                    931: #    kerb5      - kerberos version 5
                    932: #
                    933: # Parameters:
                    934: #    $cmd      - The command that got us here.
                    935: #    $tail     - Tail of the command (remaining parameters).
                    936: #    $client   - File descriptor connected to client.
                    937: # Returns
                    938: #     0        - Requested to exit, caller should shut down.
                    939: #     1        - Continue processing.
                    940: # Implicit inputs:
                    941: #    The authentication systems describe above have their own forms of implicit
                    942: #    input into the authentication process that are described above.
                    943: #
                    944: sub ChangeAuthenticationHandler {
1.178.2.4! albertel  945:     my $cmd     = shift;
        !           946:     my $tail    = shift;
        !           947:     my $client  = shift;
        !           948:    
        !           949:     my $userinput  = "$cmd:$tail";              # Reconstruct user input.
        !           950: 
        !           951:     my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
        !           952:     chomp($npass);
        !           953:     &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
        !           954:     $npass=&unescape($npass);
        !           955:     my $proname=&propath($udom,$uname);
        !           956:     my $passfilename="$proname/passwd";
        !           957:     if ($udom ne $currentdomainid) {
        !           958: 	Failure( $client, "not_right_domain\n", $client);
        !           959:     } else {
        !           960: 	my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
        !           961: 	Reply($client, $result, $userinput);
        !           962:     }
        !           963:     return 1;
1.178.2.1  foxr      964: }
                    965: RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0);
                    966: 
                    967: #
                    968: #   Determines if this is the home server for a user.  The home server
                    969: #   for a user will have his/her lon-capa passwd file.  Therefore all we need
                    970: #   to do is determine if this file exists.
                    971: #
                    972: # Parameters:
                    973: #    $cmd      - The command that got us here.
                    974: #    $tail     - Tail of the command (remaining parameters).
                    975: #    $client   - File descriptor connected to client.
                    976: # Returns
                    977: #     0        - Requested to exit, caller should shut down.
                    978: #     1        - Continue processing.
                    979: # Implicit inputs:
                    980: #    The authentication systems describe above have their own forms of implicit
                    981: #    input into the authentication process that are described above.
                    982: #
                    983: sub IsHomeHandler {
1.178.2.4! albertel  984:     my $cmd     = shift;
        !           985:     my $tail    = shift;
        !           986:     my $client  = shift;
        !           987:    
        !           988:     my $userinput  = "$cmd:$tail";
        !           989:    
        !           990:     my ($udom,$uname)=split(/:/,$tail);
        !           991:     chomp($uname);
        !           992:     my $proname=propath($udom,$uname);
        !           993:     if (-e $proname) {
        !           994: 	Reply( $client, "found\n", $userinput);
        !           995:     } else {
        !           996: 	Failure($client, "not_found\n", $userinput);
        !           997:     }
        !           998:     return 1;
1.178.2.1  foxr      999: }
                   1000: RegisterHandler("home", \&IsHomeHandler, 0,1,0);
                   1001: #
                   1002: #   Process an update request for a resource?? I think what's going on here is
                   1003: #   that a resource has been modified that we hold a subscription to.
                   1004: #   If the resource is not local, then we must update, or at least invalidate our
                   1005: #   cached copy of the resource. 
                   1006: #   FUTURE WORK:
                   1007: #      I need to look at this logic carefully.  My druthers would be to follow
                   1008: #      typical caching logic, and simple invalidate the cache, drop any subscription
                   1009: #      an let the next fetch start the ball rolling again... however that may
                   1010: #      actually be more difficult than it looks given the complex web of
                   1011: #      proxy servers.
                   1012: # Parameters:
                   1013: #    $cmd      - The command that got us here.
                   1014: #    $tail     - Tail of the command (remaining parameters).
                   1015: #    $client   - File descriptor connected to client.
                   1016: # Returns
                   1017: #     0        - Requested to exit, caller should shut down.
                   1018: #     1        - Continue processing.
                   1019: # Implicit inputs:
                   1020: #    The authentication systems describe above have their own forms of implicit
                   1021: #    input into the authentication process that are described above.
                   1022: #
                   1023: sub UpdateResourceHandler {
1.178.2.4! albertel 1024:     my $cmd    = shift;
        !          1025:     my $tail   = shift;
        !          1026:     my $client = shift;
        !          1027:    
        !          1028:     my $userinput = "$cmd:$tail";
        !          1029:    
        !          1030:     my $fname=$tail;
        !          1031:     my $ownership=ishome($fname);
        !          1032:     if ($ownership eq 'not_owner') {
        !          1033: 	if (-e $fname) {
        !          1034: 	    my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
        !          1035: 		$atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
        !          1036: 	    my $now=time;
        !          1037: 	    my $since=$now-$atime;
        !          1038: 	    if ($since>$perlvar{'lonExpire'}) {
        !          1039: 		my $reply=&reply("unsub:$fname","$clientname");
        !          1040: 		unlink("$fname");
        !          1041: 	    } else {
        !          1042: 		my $transname="$fname.in.transfer";
        !          1043: 		my $remoteurl=&reply("sub:$fname","$clientname");
        !          1044: 		my $response;
        !          1045: 		alarm(120);
        !          1046: 		{
        !          1047: 		    my $ua=new LWP::UserAgent;
        !          1048: 		    my $request=new HTTP::Request('GET',"$remoteurl");
        !          1049: 		    $response=$ua->request($request,$transname);
        !          1050: 		}
        !          1051: 		alarm(0);
        !          1052: 		if ($response->is_error()) {
        !          1053: 		    unlink($transname);
        !          1054: 		    my $message=$response->status_line;
        !          1055: 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
        !          1056: 		} else {
        !          1057: 		    if ($remoteurl!~/\.meta$/) {
        !          1058: 			alarm(120);
        !          1059: 			{
        !          1060: 			    my $ua=new LWP::UserAgent;
        !          1061: 			    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
        !          1062: 			    my $mresponse=$ua->request($mrequest,$fname.'.meta');
        !          1063: 			    if ($mresponse->is_error()) {
        !          1064: 				unlink($fname.'.meta');
        !          1065: 			    }
        !          1066: 			}
        !          1067: 			alarm(0);
        !          1068: 		    }
        !          1069: 		    rename($transname,$fname);
        !          1070: 		}
        !          1071: 	    }
        !          1072: 	    Reply( $client, "ok\n", $userinput);
        !          1073: 	} else {
        !          1074: 	    Failure($client, "not_found\n", $userinput);
        !          1075: 	}
        !          1076:     } else {
        !          1077: 	Failure($client, "rejected\n", $userinput);
        !          1078:     }
        !          1079:     return 1;
1.178.2.1  foxr     1080: }
                   1081: RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0);
                   1082: 
                   1083: #
                   1084: #   Fetch a user file from a remote server:
                   1085: # Parameters:
                   1086: #    $cmd      - The command that got us here.
                   1087: #    $tail     - Tail of the command (remaining parameters).
                   1088: #    $client   - File descriptor connected to client.
                   1089: # Returns
                   1090: #     0        - Requested to exit, caller should shut down.
                   1091: #     1        - Continue processing.
                   1092: #
                   1093: sub FetchUserFileHandler {
1.178.2.4! albertel 1094:     my $cmd     = shift;
        !          1095:     my $tail    = shift;
        !          1096:     my $client  = shift;
        !          1097:    
        !          1098:     my $userinput = "$cmd:$tail";
        !          1099:     my $fname           = $tail;
        !          1100:     my ($udom,$uname,$ufile)=split(/\//,$fname);
        !          1101:     my $udir=propath($udom,$uname).'/userfiles';
        !          1102:     unless (-e $udir) {
        !          1103: 	mkdir($udir,0770); 
        !          1104:     }
        !          1105:     if (-e $udir) {
        !          1106: 	$ufile=~s/^[\.\~]+//;
        !          1107: 	$ufile=~s/\///g;
        !          1108: 	my $destname=$udir.'/'.$ufile;
        !          1109: 	my $transname=$udir.'/'.$ufile.'.in.transit';
        !          1110: 	my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
        !          1111: 	my $response;
        !          1112: 	alarm(120);
        !          1113: 	{
        !          1114: 	    my $ua=new LWP::UserAgent;
        !          1115: 	    my $request=new HTTP::Request('GET',"$remoteurl");
        !          1116: 	    $response=$ua->request($request,$transname);
        !          1117: 	}
        !          1118: 	alarm(0);
        !          1119: 	if ($response->is_error()) {
        !          1120: 	    unlink($transname);
        !          1121: 	    my $message=$response->status_line;
        !          1122: 	    &logthis("LWP GET: $message for $fname ($remoteurl)");
        !          1123: 	    Failure($client, "failed\n", $userinput);
        !          1124: 	} else {
        !          1125: 	    if (!rename($transname,$destname)) {
        !          1126: 		&logthis("Unable to move $transname to $destname");
        !          1127: 		unlink($transname);
        !          1128: 		Failure($client, "failed\n", $userinput);
        !          1129: 	    } else {
        !          1130: 		Reply($client, "ok\n", $userinput);
        !          1131: 	    }
        !          1132: 	}   
        !          1133:     } else {
        !          1134: 	Failure($client, "not_home\n", $userinput);
        !          1135:     }
        !          1136:     return 1;
1.178.2.1  foxr     1137: }
                   1138: RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0);
                   1139: #
                   1140: #   Authenticate access to a user file.  Question?   The token for athentication
                   1141: #   is allowed to be sent as cleartext is this really what we want?  This token
                   1142: #   represents the user's session id.  Once it is forged does this allow too much access??
                   1143: #
                   1144: # Parameters:
                   1145: #    $cmd      - The command that got us here.
                   1146: #    $tail     - Tail of the command (remaining parameters).
                   1147: #    $client   - File descriptor connected to client.
                   1148: # Returns
                   1149: #     0        - Requested to exit, caller should shut down.
                   1150: #     1        - Continue processing.
                   1151: sub AuthenticateUserFileAccess {
1.178.2.4! albertel 1152:     my $cmd   = shift;
        !          1153:     my $tail    = shift;
        !          1154:     my $client = shift;
        !          1155:     my $userinput = "$cmd:$tail";
        !          1156: 
        !          1157:     my ($fname,$session)=split(/:/,$tail);
        !          1158:     chomp($session);
        !          1159:     my $reply='non_auth';
        !          1160:     if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) {
        !          1161: 	while (my $line=<ENVIN>) {
        !          1162: 	    if ($line=~/userfile\.$fname\=/) { 
        !          1163: 		$reply='ok'; 
        !          1164: 	    }
        !          1165: 	}
        !          1166: 	close(ENVIN);
        !          1167: 	Reply($client, $reply."\n", $userinput);
        !          1168:     } else {
        !          1169: 	Failure($client, "invalid_token\n", $userinput);
        !          1170:     }
        !          1171:     return 1;
1.178.2.1  foxr     1172:    
                   1173: }
                   1174: RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);
                   1175: #
                   1176: #   Unsubscribe from a resource.
                   1177: #
                   1178: # Parameters:
                   1179: #    $cmd      - The command that got us here.
                   1180: #    $tail     - Tail of the command (remaining parameters).
                   1181: #    $client   - File descriptor connected to client.
                   1182: # Returns
                   1183: #     0        - Requested to exit, caller should shut down.
                   1184: #     1        - Continue processing.
                   1185: #
                   1186: sub UnsubscribeHandler {
1.178.2.4! albertel 1187:     my $cmd      = shift;
        !          1188:     my $tail     = shift;
        !          1189:     my $client   = shift;
        !          1190:     my $userinput= "$cmd:$tail";
        !          1191:     
        !          1192:     my $fname = $tail;
        !          1193:     if (-e $fname) {
        !          1194: 	Reply($client, &unsub($client,$fname,$clientip), $userinput);
        !          1195:     } else {
        !          1196: 	Failure($client, "not_found\n", $userinput);
        !          1197:     }
        !          1198:     return 1;
1.178.2.1  foxr     1199: }
                   1200: RegisterHandler("unusb", \&UnsubscribeHandler, 0, 1, 0);
                   1201: 
                   1202: #   Subscribe to a resource.
                   1203: #
                   1204: # Parameters:
                   1205: #    $cmd      - The command that got us here.
                   1206: #    $tail     - Tail of the command (remaining parameters).
                   1207: #    $client   - File descriptor connected to client.
                   1208: # Returns
                   1209: #     0        - Requested to exit, caller should shut down.
                   1210: #     1        - Continue processing.
                   1211: #
                   1212: sub SubscribeHandler {
1.178.2.4! albertel 1213:     my $cmd        = shift;
        !          1214:     my $tail       = shift;
        !          1215:     my $client     = shift;
        !          1216:     my $userinput  = "$cmd:$tail";
1.178.2.1  foxr     1217: 
1.178.2.4! albertel 1218:     Reply( $client, &subscribe($userinput,$clientip), $userinput);
        !          1219: 
        !          1220:     return 1;
1.178.2.1  foxr     1221: }
                   1222: RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0);
                   1223: 
                   1224: #
                   1225: #   Determine the version of a resource (?) Or is it return
                   1226: #   the top version of the resource?  Not yet clear from the
                   1227: #   code in currentversion.
                   1228: #
                   1229: # Parameters:
                   1230: #    $cmd      - The command that got us here.
                   1231: #    $tail     - Tail of the command (remaining parameters).
                   1232: #    $client   - File descriptor connected to client.
                   1233: # Returns
                   1234: #     0        - Requested to exit, caller should shut down.
                   1235: #     1        - Continue processing.
                   1236: #
                   1237: sub CurrentVersionHandler {
1.178.2.4! albertel 1238:     my $cmd      = shift;
        !          1239:     my $tail     = shift;
        !          1240:     my $client   = shift;
        !          1241:     my $userinput= "$cmd:$tail";
        !          1242:    
        !          1243:     my $fname   = $tail;
        !          1244:     Reply( $client, &currentversion($fname)."\n", $userinput);
        !          1245:     return 1;
1.178.2.1  foxr     1246: 
                   1247: }
                   1248: RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0);
                   1249: 
                   1250: 
                   1251: #  Make an entry in a user's activity log.
                   1252: #
                   1253: # Parameters:
                   1254: #    $cmd      - The command that got us here.
                   1255: #    $tail     - Tail of the command (remaining parameters).
                   1256: #    $client   - File descriptor connected to client.
                   1257: # Returns
                   1258: #     0        - Requested to exit, caller should shut down.
                   1259: #     1        - Continue processing.
                   1260: #
                   1261: sub ActivityLogEntryHandler {
1.178.2.4! albertel 1262:     my $cmd      = shift;
        !          1263:     my $tail     = shift;
        !          1264:     my $client   = shift;
        !          1265:     my $userinput= "$cmd:$tail";
        !          1266: 
        !          1267:     my ($udom,$uname,$what)=split(/:/,$tail);
        !          1268:     chomp($what);
        !          1269:     my $proname=propath($udom,$uname);
        !          1270:     my $now=time;
        !          1271:     my $hfh;
        !          1272:     if ($hfh=IO::File->new(">>$proname/activity.log")) { 
        !          1273: 	print $hfh "$now:$clientname:$what\n";
        !          1274: 	Reply( $client, "ok\n", $userinput); 
        !          1275:     } else {
        !          1276: 	Reply($client, "error: ".($!+0)." IO::File->new Failed "
        !          1277: 	      ."while attempting log\n", 
        !          1278: 	      $userinput);
        !          1279:     }
1.178.2.1  foxr     1280: 
1.178.2.4! albertel 1281:     return 1;
1.178.2.1  foxr     1282: }
                   1283: RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0);
                   1284: #
                   1285: #   Put a namespace entry in a user profile hash.
                   1286: #   My druthers would be for this to be an encrypted interaction too.
                   1287: #   anything that might be an inadvertent covert channel about either
                   1288: #   user authentication or user personal information....
                   1289: #
                   1290: # Parameters:
                   1291: #    $cmd      - The command that got us here.
                   1292: #    $tail     - Tail of the command (remaining parameters).
                   1293: #    $client   - File descriptor connected to client.
                   1294: # Returns
                   1295: #     0        - Requested to exit, caller should shut down.
                   1296: #     1        - Continue processing.
                   1297: #
                   1298: sub PutUserProfileEntry {
1.178.2.4! albertel 1299:     my $cmd       = shift;
        !          1300:     my $tail      = shift;
        !          1301:     my $client    = shift;
        !          1302:     my $userinput = "$cmd:$tail";
        !          1303: 
        !          1304:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
        !          1305:     $namespace=~s/\//\_/g;
        !          1306:     $namespace=~s/\W//g;
        !          1307:     if ($namespace ne 'roles') {
        !          1308: 	chomp($what);
        !          1309: 	my $proname=propath($udom,$uname);
        !          1310: 	my $now=time;
        !          1311: 	unless ($namespace=~/^nohist\_/) {
        !          1312: 	    my $hfh;
        !          1313: 	    if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1314: 		print $hfh "P:$now:$what\n"; 
        !          1315: 	    }
        !          1316: 	}
        !          1317: 	my @pairs=split(/\&/,$what);
        !          1318: 	my %hash;
        !          1319: 	if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
        !          1320: 		&GDBM_WRCREAT(),0640)) {
        !          1321: 	    foreach my $pair (@pairs) {
        !          1322: 		my ($key,$value)=split(/=/,$pair);
        !          1323: 		$hash{$key}=$value;
        !          1324: 	    }
        !          1325: 	    if (untie(%hash)) {
        !          1326: 		Reply( $client, "ok\n", $userinput);
        !          1327: 	    } else {
        !          1328: 		Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
        !          1329: 			"while attempting put\n", 
        !          1330: 			$userinput);
        !          1331: 	    }
        !          1332: 	} else {
        !          1333: 	    Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
        !          1334: 		     "while attempting put\n", $userinput);
        !          1335: 	}
        !          1336:     } else {
        !          1337: 	Failure( $client, "refused\n", $userinput);
        !          1338:     }
1.178.2.1  foxr     1339:    
1.178.2.4! albertel 1340:     return 1;
1.178.2.1  foxr     1341: }
                   1342: RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0);
                   1343: 
                   1344: # 
                   1345: #   Increment a profile entry in the user history file.
                   1346: #   The history contains keyword value pairs.  In this case,
                   1347: #   The value itself is a pair of numbers.  The first, the current value
                   1348: #   the second an increment that this function applies to the current
                   1349: #   value.
                   1350: #
                   1351: # Parameters:
                   1352: #    $cmd      - The command that got us here.
                   1353: #    $tail     - Tail of the command (remaining parameters).
                   1354: #    $client   - File descriptor connected to client.
                   1355: # Returns
                   1356: #     0        - Requested to exit, caller should shut down.
                   1357: #     1        - Continue processing.
                   1358: #
                   1359: sub IncrementUserValueHandler {
1.178.2.4! albertel 1360:     my $cmd         = shift;
        !          1361:     my $tail        = shift;
        !          1362:     my $client      = shift;
        !          1363:     my $userinput   = shift;
        !          1364: 
        !          1365:     my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
        !          1366:     $namespace=~s/\//\_/g;
        !          1367:     $namespace=~s/\W//g;
        !          1368:     if ($namespace ne 'roles') {
        !          1369: 	chomp($what);
        !          1370: 	my $proname=propath($udom,$uname);
        !          1371: 	my $now=time;
        !          1372: 	unless ($namespace=~/^nohist\_/) {
        !          1373: 	    my $hfh;
        !          1374: 	    if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1375: 		print $hfh "P:$now:$what\n";
        !          1376: 	    }
        !          1377: 	}
        !          1378: 	my @pairs=split(/\&/,$what);
        !          1379: 	my %hash;
        !          1380: 	if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),
        !          1381: 		0640)) {
        !          1382: 	    foreach my $pair (@pairs) {
        !          1383: 		my ($key,$value)=split(/=/,$pair);
        !          1384: 		# We could check that we have a number...
        !          1385: 		if (! defined($value) || $value eq '') {
        !          1386: 		    $value = 1;
        !          1387: 		}
        !          1388: 		$hash{$key}+=$value;
        !          1389: 	    }
        !          1390: 	    if (untie(%hash)) {
        !          1391: 		Reply( $client, "ok\n", $userinput);
        !          1392: 	    } else {
        !          1393: 		Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
        !          1394: 			"while attempting put\n", $userinput);
        !          1395: 	    }
        !          1396: 	} else {
        !          1397: 	    Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1398: 		    "while attempting put\n", $userinput);
        !          1399: 	}
        !          1400:     } else {
        !          1401: 	Failure($client, "refused\n", $userinput);
        !          1402:     }
1.178.2.1  foxr     1403: 
1.178.2.4! albertel 1404:     return 1;
1.178.2.1  foxr     1405: }
                   1406: RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0);
                   1407: #
                   1408: #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
                   1409: #   Each 'role' a user has implies a set of permissions.  Adding a new role
                   1410: #   for a person grants the permissions packaged with that role
                   1411: #   to that user when the role is selected.
                   1412: #
                   1413: # Parameters:
                   1414: #    $cmd       - The command string (rolesput).
                   1415: #    $tail      - The remainder of the request line.  For rolesput this
                   1416: #                 consists of a colon separated list that contains:
                   1417: #                 The domain and user that is granting the role (logged).
                   1418: #                 The domain and user that is getting the role.
                   1419: #                 The roles being granted as a set of & separated pairs.
                   1420: #                 each pair a key value pair.
                   1421: #    $client    - File descriptor connected to the client.
                   1422: # Returns:
                   1423: #     0         - If the daemon should exit
                   1424: #     1         - To continue processing.
                   1425: #
                   1426: #
                   1427: sub RolesPutHandler {
1.178.2.4! albertel 1428:     my $cmd        = shift;
        !          1429:     my $tail       = shift;
        !          1430:     my $client     = shift;
        !          1431:     my $userinput  = "$cmd:$tail";
        !          1432: 
        !          1433:     my ($exedom,$exeuser,$udom,$uname,$what)   =split(/:/,$tail);
        !          1434:     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
        !          1435: 	   "what = ".$what);
        !          1436:     my $namespace='roles';
        !          1437:     chomp($what);
        !          1438:     my $proname=propath($udom,$uname);
        !          1439:     my $now=time;
        !          1440:     #
        !          1441:     #  Log the attempt to set a role.  The {}'s here ensure that the file 
        !          1442:     #  handle is open for the minimal amount of time.  Since the flush
        !          1443:     #  is done on close this improves the chances the log will be an un-
        !          1444:     #  corrupted ordered thing.
        !          1445:     {
        !          1446: 	my $hfh;
        !          1447: 	if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1448: 	    print $hfh "P:$now:$exedom:$exeuser:$what\n";
        !          1449: 	}
        !          1450:     }
        !          1451:     my @pairs=split(/\&/,$what);
        !          1452:     my %hash;
        !          1453:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_WRCREAT(),0640)) {
        !          1454: 	foreach my $pair (@pairs) {
        !          1455: 	    my ($key,$value)=split(/=/,$pair);
1.178.2.1  foxr     1456:             &ManagePermissions($key, $udom, $uname,
                   1457:                                &GetAuthType( $udom, $uname));
                   1458:             $hash{$key}=$value;
1.178.2.4! albertel 1459: 	}
        !          1460: 	if (untie(%hash)) {
        !          1461: 	    Reply($client, "ok\n", $userinput);
        !          1462: 	} else {
        !          1463: 	    Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1464: 		     "while attempting rolesput\n", $userinput);
        !          1465: 	}
        !          1466:     } else {
        !          1467: 	Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1468: 		 "while attempting rolesput\n", $userinput);
        !          1469:     }
        !          1470:     return 1;
1.178.2.1  foxr     1471: }
                   1472: RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0);  # Encoded client only.
                   1473: #
                   1474: #   Deletes (removes) a role for a user.   This is equivalent to removing
                   1475: #  a permissions package associated with the role from the user's profile.
                   1476: #
                   1477: # Parameters:
                   1478: #     $cmd                 - The command (rolesdel)
                   1479: #     $tail                - The remainder of the request line. This consists
                   1480: #                             of:
                   1481: #                             The domain and user requesting the change (logged)
                   1482: #                             The domain and user being changed.
                   1483: #                             The roles being revoked.  These are shipped to us
                   1484: #                             as a bunch of & separated role name keywords.
                   1485: #     $client              - The file handle open on the client.
                   1486: # Returns:
                   1487: #     1                    - Continue processing
                   1488: #     0                    - Exit.
                   1489: #
                   1490: sub RolesDeleteHandler {
1.178.2.4! albertel 1491:     my $cmd          = shift;
        !          1492:     my $tail         = shift;
        !          1493:     my $client       = shift;
        !          1494:     my $userinput    = "$cmd:$tail";
        !          1495:    
        !          1496:     my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
        !          1497:     &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
        !          1498: 	   "what = ".$what);
        !          1499:     my $namespace='roles';
        !          1500:     chomp($what);
        !          1501:     my $proname=propath($udom,$uname);
        !          1502:     my $now=time;
        !          1503:     #
        !          1504:     #   Log the attempt. This {}'ing is done to ensure that the
        !          1505:     #   logfile is flushed and closed as quickly as possible.  Hopefully
        !          1506:     #   this preserves both time ordering and reduces the probability that
        !          1507:     #   messages will be interleaved.
        !          1508:     #
        !          1509:     {
        !          1510: 	my $hfh;
        !          1511: 	if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1512: 	    print $hfh "D:$now:$exedom:$exeuser:$what\n";
        !          1513: 	}
        !          1514:     }
        !          1515:     my @rolekeys=split(/\&/,$what);
        !          1516:     my %hash;
        !          1517:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_WRCREAT(),0640)) {
        !          1518: 	foreach my $key (@rolekeys) {
        !          1519: 	    delete $hash{$key};
        !          1520: 	}
        !          1521: 	if (untie(%hash)) {
        !          1522: 	    Reply($client, "ok\n", $userinput);
        !          1523: 	} else {
        !          1524: 	    Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1525: 		     "while attempting rolesdel\n", $userinput);
        !          1526: 	}
        !          1527:     } else {
        !          1528: 	Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1529: 		 "while attempting rolesdel\n", $userinput);
        !          1530:     }
        !          1531:     
        !          1532:     return 1;
1.178.2.1  foxr     1533: }
                   1534: RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only
                   1535: 
                   1536: # Unencrypted get from a user's profile database.  See 
                   1537: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
                   1538: # This function retrieves a keyed item from a specific named database in the
                   1539: # user's directory.
                   1540: #
                   1541: # Parameters:
                   1542: #   $cmd             - Command request keyword (get).
                   1543: #   $tail            - Tail of the command.  This is a colon separated list
                   1544: #                      consisting of the domain and username that uniquely
                   1545: #                      identifies the profile,
                   1546: #                      The 'namespace' which selects the gdbm file to 
                   1547: #                      do the lookup in, 
                   1548: #                      & separated list of keys to lookup.  Note that
                   1549: #                      the values are returned as an & separated list too.
                   1550: #   $client          - File descriptor open on the client.
                   1551: # Returns:
                   1552: #   1       - Continue processing.
                   1553: #   0       - Exit.
                   1554: #
                   1555: sub GetProfileEntry {
1.178.2.4! albertel 1556:     my $cmd      = shift;
        !          1557:     my $tail     = shift;
        !          1558:     my $client   = shift;
        !          1559:     my $userinput= "$cmd:$tail";
        !          1560:    
        !          1561:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
        !          1562:     $namespace=~s/\//\_/g;
        !          1563:     $namespace=~s/\W//g;
        !          1564:     chomp($what);
        !          1565:     my @queries=split(/\&/,$what);
        !          1566:     my $proname=propath($udom,$uname);
        !          1567:     my $qresult='';
        !          1568:     my %hash;
        !          1569:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {
        !          1570: 	for (my $i=0;$i<=$#queries;$i++) {
        !          1571: 	    $qresult.="$hash{$queries[$i]}&";    # Presumably failure gives empty string.
        !          1572: 	}
        !          1573: 	if (untie(%hash)) {
        !          1574: 	    $qresult=~s/\&$//;              # Remove trailing & from last lookup.
        !          1575: 	    Reply($client, "$qresult\n", $userinput);
        !          1576: 	} else {
        !          1577: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1578: 		    "while attempting get\n", $userinput);
        !          1579: 	}
        !          1580:     } else {
        !          1581: 	if ($!+0 == 2) {               # +0 coerces errno -> number 2 is ENOENT
        !          1582: 	    Failure($client, "error:No such file or ".
        !          1583: 		    "GDBM reported bad block error\n", $userinput);
        !          1584: 	} else {                        # Some other undifferentiated err.
        !          1585: 	    Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1586: 		    "while attempting get\n", $userinput);
        !          1587: 	}
        !          1588:     }
        !          1589:     return 1;
1.178.2.1  foxr     1590: }
                   1591: RegisterHandler("get", \&GetProfileEntry, 0,1,0);
                   1592: #
                   1593: #  Process the encrypted get request.  Note that the request is sent
                   1594: #  in clear, but the reply is encrypted.  This is a small covert channel:
                   1595: #  information about the sensitive keys is given to the snooper.  Just not
                   1596: #  information about the values of the sensitive key.  Hmm if I wanted to
                   1597: #  know these I'd snoop for the egets. Get the profile item names from them
                   1598: #  and then issue a get for them since there's no enforcement of the
                   1599: #  requirement of an encrypted get for particular profile items.  If I
                   1600: #  were re-doing this, I'd force the request to be encrypted as well as the
                   1601: #  reply.  I'd also just enforce encrypted transactions for all gets since
                   1602: #  that would prevent any covert channel snooping.
                   1603: #
                   1604: #  Parameters:
                   1605: #     $cmd               - Command keyword of request (eget).
                   1606: #     $tail              - Tail of the command.  See GetProfileEntry
#                          for more information about this.
                   1607: #     $client            - File open on the client.
                   1608: #  Returns:
                   1609: #     1      - Continue processing
                   1610: #     0      - server should exit.
                   1611: sub GetProfileEntryEncrypted {
1.178.2.4! albertel 1612:     my $cmd       = shift;
        !          1613:     my $tail      = shift;
        !          1614:     my $client    = shift;
        !          1615:     my $userinput = "$cmd:$tail";
        !          1616:    
        !          1617:     my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
        !          1618:     $namespace=~s/\//\_/g;
        !          1619:     $namespace=~s/\W//g;
        !          1620:     chomp($what);
        !          1621:     my @queries=split(/\&/,$what);
        !          1622:     my $proname=propath($udom,$uname);
        !          1623:     my $qresult='';
        !          1624:     my %hash;
        !          1625:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
        !          1626: 	for (my $i=0;$i<=$#queries;$i++) {
        !          1627: 	    $qresult.="$hash{$queries[$i]}&";
        !          1628: 	}
        !          1629: 	if (untie(%hash)) {
        !          1630: 	    $qresult=~s/\&$//;
        !          1631: 	    if ($cipher) {
        !          1632: 		my $cmdlength=length($qresult);
        !          1633: 		$qresult.="         ";
        !          1634: 		my $encqresult='';
        !          1635: 		for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
        !          1636: 		    $encqresult.= unpack("H16", $cipher->encrypt(substr($qresult,
        !          1637: 									$encidx,
        !          1638: 									8)));
        !          1639: 		}
        !          1640: 		Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
        !          1641: 	    } else {
        !          1642: 		Failure( $client, "error:no_key\n", $userinput);
        !          1643: 	    }
        !          1644: 	} else {
        !          1645: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1646: 		    "while attempting eget\n", $userinput);
        !          1647: 	}
        !          1648:     } else {
        !          1649: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1650: 		"while attempting eget\n", $userinput);
        !          1651:     }
        !          1652:     
        !          1653:     return 1;
1.178.2.1  foxr     1654: }
                   1655: RegisterHandler("eget", \&GetProfileEncrypted, 0, 1, 0);
                   1656: 
                   1657: #
                   1658: #   Deletes a key in a user profile database.
                   1659: #   
                   1660: #   Parameters:
                   1661: #       $cmd                  - Command keyword (del).
                   1662: #       $tail                 - Command tail.  IN this case a colon
                   1663: #                               separated list containing:
                   1664: #                               The domain and user that identifies uniquely
                   1665: #                               the identity of the user.
                   1666: #                               The profile namespace (name of the profile
                   1667: #                               database file).
                   1668: #                               & separated list of keywords to delete.
                   1669: #       $client              - File open on client socket.
                   1670: # Returns:
                   1671: #     1   - Continue processing
                   1672: #     0   - Exit server.
                   1673: #
                   1674: #
                   1675: sub DeletProfileEntry {
1.178.2.4! albertel 1676:     my $cmd      = shift;
        !          1677:     my $tail     = shift;
        !          1678:     my $client   = shift;
        !          1679:     my $userinput = "cmd:$tail";
        !          1680: 
        !          1681:     my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
        !          1682:     $namespace=~s/\//\_/g;
        !          1683:     $namespace=~s/\W//g;
        !          1684:     chomp($what);
        !          1685:     my $proname=propath($udom,$uname);
        !          1686:     my $now=time;
        !          1687:     unless ($namespace=~/^nohist\_/) {
        !          1688: 	my $hfh;
        !          1689: 	if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1690: 	    print $hfh "D:$now:$what\n"; 
        !          1691: 	}
        !          1692:     }
        !          1693:     my @keys=split(/\&/,$what);
        !          1694:     my %hash;
        !          1695:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
        !          1696: 	foreach my $key (@keys) {
        !          1697: 	    delete($hash{$key});
        !          1698: 	}
        !          1699: 	if (untie(%hash)) {
        !          1700: 	    Reply($client, "ok\n", $userinput);
        !          1701: 	} else {
        !          1702: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1703: 		    "while attempting del\n", $userinput);
        !          1704: 	}
        !          1705:     } else {
        !          1706: 	Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1707: 		 "while attempting del\n", $userinput);
        !          1708:     }
        !          1709:     return 1;
1.178.2.1  foxr     1710: }
                   1711: RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0);
                   1712: #
                   1713: #  List the set of keys that are defined in a profile database file.
                   1714: #  A successful reply from this will contain an & separated list of
                   1715: #  the keys. 
                   1716: # Parameters:
                   1717: #     $cmd              - Command request (keys).
                   1718: #     $tail             - Remainder of the request, a colon separated
                   1719: #                         list containing domain/user that identifies the
                   1720: #                         user being queried, and the database namespace
                   1721: #                         (database filename essentially).
                   1722: #     $client           - File open on the client.
                   1723: #  Returns:
                   1724: #    1    - Continue processing.
                   1725: #    0    - Exit the server.
                   1726: #
                   1727: sub GetProfileKeys {
1.178.2.4! albertel 1728:     my $cmd       = shift;
        !          1729:     my $tail      = shift;
        !          1730:     my $client    = shift;
        !          1731:     my $userinput = "$cmd:$tail";
        !          1732: 
        !          1733:     my ($udom,$uname,$namespace)=split(/:/,$tail);
        !          1734:     $namespace=~s/\//\_/g;
        !          1735:     $namespace=~s/\W//g;
        !          1736:     my $proname=propath($udom,$uname);
        !          1737:     my $qresult='';
        !          1738:     my %hash;
        !          1739:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
        !          1740: 	foreach my $key (keys %hash) {
        !          1741: 	    $qresult.="$key&";
        !          1742: 	}
        !          1743: 	if (untie(%hash)) {
        !          1744: 	    $qresult=~s/\&$//;
        !          1745: 	    Reply($client, "$qresult\n", $userinput);
        !          1746: 	} else {
        !          1747: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1748: 		    "while attempting keys\n", $userinput);
        !          1749: 	}
        !          1750:     } else {
        !          1751: 	Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1752: 		 "while attempting keys\n", $userinput);
        !          1753:     }
1.178.2.1  foxr     1754:    
1.178.2.4! albertel 1755:     return 1;
1.178.2.1  foxr     1756: }
                   1757: RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0);
                   1758: #
                   1759: #   Dump the contents of a user profile database.
                   1760: #   Note that this constitutes a very large covert channel too since
                   1761: #   the dump will return sensitive information that is not encrypted.
                   1762: #   The naive security assumption is that the session negotiation ensures
                   1763: #   our client is trusted and I don't believe that's assured at present.
                   1764: #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
                   1765: #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
                   1766: # 
                   1767: #  Parameters:
                   1768: #     $cmd           - The command request keyword (currentdump).
                   1769: #     $tail          - Remainder of the request, consisting of a colon
                   1770: #                      separated list that has the domain/username and
                   1771: #                      the namespace to dump (database file).
                   1772: #     $client        - file open on the remote client.
                   1773: # Returns:
                   1774: #     1    - Continue processing.
                   1775: #     0    - Exit the server.
                   1776: #
                   1777: sub DumpProfileDatabase {
1.178.2.4! albertel 1778:     my $cmd       = shift;
        !          1779:     my $tail      = shift;
        !          1780:     my $client    = shift;
        !          1781:     my $userinput = "$cmd:$tail";
        !          1782:    
        !          1783:     my ($udom,$uname,$namespace) = split(/:/,$tail);
        !          1784:     $namespace=~s/\//\_/g;
        !          1785:     $namespace=~s/\W//g;
        !          1786:     my $qresult='';
        !          1787:     my $proname=propath($udom,$uname);
        !          1788:     my %hash;
        !          1789:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {
        !          1790: 	# Structure of %data:
        !          1791: 	# $data{$symb}->{$parameter}=$value;
        !          1792: 	# $data{$symb}->{'v.'.$parameter}=$version;
        !          1793: 	# since $parameter will be unescaped, we do not
        !          1794: 	# have to worry about silly parameter names...
        !          1795: 	my %data = ();                     # A hash of anonymous hashes..
        !          1796: 	while (my ($key,$value) = each(%hash)) {
        !          1797: 	    my ($v,$symb,$param) = split(/:/,$key);
        !          1798: 	    next if ($v eq 'version' || $symb eq 'keys');
        !          1799: 	    next if (exists($data{$symb}) && 
        !          1800: 		     exists($data{$symb}->{$param}) &&
        !          1801: 		     $data{$symb}->{'v.'.$param} > $v);
        !          1802: 	    $data{$symb}->{$param}=$value;
        !          1803: 	    $data{$symb}->{'v.'.$param}=$v;
        !          1804: 	}
        !          1805: 	if (untie(%hash)) {
        !          1806: 	    while (my ($symb,$param_hash) = each(%data)) {
        !          1807: 		while(my ($param,$value) = each (%$param_hash)){
        !          1808: 		    next if ($param =~ /^v\./);       # Ignore versions...
        !          1809: 		    #
        !          1810: 		    #   Just dump the symb=value pairs separated by &
        !          1811: 		    #
        !          1812: 		    $qresult.=$symb.':'.$param.'='.$value.'&';
        !          1813: 		}
        !          1814: 	    }
        !          1815: 	    chop($qresult);
        !          1816: 	    Reply($client , "$qresult\n", $userinput);
        !          1817: 	} else {
        !          1818: 	    Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1819: 		     "while attempting currentdump\n", $userinput);
        !          1820: 	}
        !          1821:     } else {
        !          1822: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1823: 		"while attempting currentdump\n", $userinput);
        !          1824:     }
1.178.2.1  foxr     1825: 
1.178.2.4! albertel 1826:     return 1;
1.178.2.1  foxr     1827: }
                   1828: RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0);
                   1829: #
                   1830: #   Dump a profile database with an optional regular expression
                   1831: #   to match against the keys.  In this dump, no effort is made
                   1832: #   to separate symb from version information. Presumably the
                   1833: #   databases that are dumped by this command are of a different
                   1834: #   structure.  Need to look at this and improve the documentation of
                   1835: #   both this and the currentdump handler.
                   1836: # Parameters:
                   1837: #    $cmd                     - The command keyword.
                   1838: #    $tail                    - All of the characters after the $cmd:
                   1839: #                               These are expected to be a colon
                   1840: #                               separated list containing:
                   1841: #                               domain/user - identifying the user.
                   1842: #                               namespace   - identifying the database.
                   1843: #                               regexp      - optional regular expression
                   1844: #                                             that is matched against
                   1845: #                                             database keywords to do
                   1846: #                                             selective dumps.
                   1847: #   $client                   - Channel open on the client.
                   1848: # Returns:
                   1849: #    1    - Continue processing.
                   1850: # Side effects:
                   1851: #    response is written to $client.
                   1852: #
                   1853: sub DumpWithRegexp {
1.178.2.4! albertel 1854:     my $cmd    = shift;
        !          1855:     my $tail   = shift;
        !          1856:     my $client = shift;
        !          1857: 
        !          1858:     my $userinput = "$cmd:$tail";
        !          1859: 
        !          1860:     my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
        !          1861:     $namespace=~s/\//\_/g;
        !          1862:     $namespace=~s/\W//g;
        !          1863:     if (defined($regexp)) {
        !          1864: 	$regexp=&unescape($regexp);
        !          1865:     } else {
        !          1866: 	$regexp='.';
        !          1867:     }
        !          1868:     my $qresult='';
        !          1869:     my $proname=propath($udom,$uname);
        !          1870:     my %hash;
        !          1871:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
        !          1872: 	    &GDBM_READER(),0640)) {
        !          1873: 	study($regexp);
        !          1874: 	while (my ($key,$value) = each(%hash)) {
        !          1875: 	    if ($regexp eq '.') {
        !          1876: 		$qresult.=$key.'='.$value.'&';
        !          1877: 	    } else {
        !          1878: 		my $unescapeKey = &unescape($key);
        !          1879: 		if (eval('$unescapeKey=~/$regexp/')) {
        !          1880: 		    $qresult.="$key=$value&";
        !          1881: 		}
        !          1882: 	    }
        !          1883: 	}
        !          1884: 	if (untie(%hash)) {
        !          1885: 	    chop($qresult);
        !          1886: 	    Reply($client, "$qresult\n", $userinput);
        !          1887: 	} else {
        !          1888: 	    Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1889: 		     "while attempting dump\n", $userinput);
        !          1890: 	}
        !          1891:     } else {
        !          1892: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1893: 		"while attempting dump\n", $userinput);
        !          1894:     }
1.178.2.1  foxr     1895: 
                   1896:     return 1;
                   1897: }
                   1898: RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0);
                   1899: 
                   1900: #  Store an aitem in any database but the roles database.
                   1901: #
                   1902: #  Parameters:
                   1903: #    $cmd                - Request command keyword.
                   1904: #    $tail               - Tail of the request.  This is a colon
                   1905: #                          separated list containing:
                   1906: #                          domain/user - User and authentication domain.
                   1907: #                          namespace   - Name of the database being modified
                   1908: #                          rid         - Resource keyword to modify.
                   1909: #                          what        - new value associated with rid.
                   1910: #
                   1911: #    $client             - Socket open on the client.
                   1912: #
                   1913: #
                   1914: #  Returns:
                   1915: #      1 (keep on processing).
                   1916: #  Side-Effects:
                   1917: #    Writes to the client
                   1918: sub StoreHandler {
1.178.2.4! albertel 1919:     my $cmd    = shift;
        !          1920:     my $tail   = shift;
        !          1921:     my $client = shift;
1.178.2.1  foxr     1922:  
1.178.2.4! albertel 1923:     my $userinput = "$cmd:$tail";
1.178.2.1  foxr     1924: 
1.178.2.4! albertel 1925:     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
        !          1926:     $namespace=~s/\//\_/g;
        !          1927:     $namespace=~s/\W//g;
        !          1928:     if ($namespace ne 'roles') {
        !          1929: 	chomp($what);
        !          1930: 	my $proname=propath($udom,$uname);
        !          1931: 	my $now=time;
        !          1932: 	unless ($namespace=~/^nohist\_/) {
        !          1933: 	    my $hfh;
        !          1934: 	    if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
        !          1935: 		print $hfh "P:$now:$rid:$what\n"; 
        !          1936: 	    }
        !          1937: 	}
        !          1938: 	my @pairs=split(/\&/,$what);
        !          1939: 	my %hash;
        !          1940: 	if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
        !          1941: 		&GDBM_WRCREAT(),0640)) {
        !          1942: 	    my @previouskeys=split(/&/,$hash{"keys:$rid"});
        !          1943: 	    my $key;
        !          1944: 	    $hash{"version:$rid"}++;
        !          1945: 	    my $version=$hash{"version:$rid"};
        !          1946: 	    my $allkeys=''; 
        !          1947: 	    foreach my $pair (@pairs) {
        !          1948: 		my ($key,$value)=split(/=/,$pair);
        !          1949: 		$allkeys.=$key.':';
        !          1950: 		$hash{"$version:$rid:$key"}=$value;
        !          1951: 	    }
        !          1952: 	    $hash{"$version:$rid:timestamp"}=$now;
        !          1953: 	    $allkeys.='timestamp';
        !          1954: 	    $hash{"$version:keys:$rid"}=$allkeys;
        !          1955: 	    if (untie(%hash)) {
        !          1956: 		Reply($client, "ok\n", $userinput);
        !          1957: 	    } else {
        !          1958: 		Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1959: 			"while attempting store\n", $userinput);
        !          1960: 	    }
        !          1961: 	} else {
        !          1962: 	    Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1963: 		     "while attempting store\n", $userinput);
        !          1964: 	}
        !          1965:     } else {
        !          1966: 	Failure($client, "refused\n", $userinput);
1.178.2.1  foxr     1967:     }
                   1968: 
1.178.2.4! albertel 1969:     return 1;
1.178.2.1  foxr     1970: }
                   1971: RegisterHandler("store", \&StoreHandler, 0, 1, 0);
                   1972: #
                   1973: #   Restore a prior version of a resource.
                   1974: #
                   1975: #  Parameters:
                   1976: #     $cmd               - Command keyword.
                   1977: #     $tail              - Remainder of the request which consists of:
                   1978: #                          domain/user   - User and auth. domain.
                   1979: #                          namespace     - name of resource database.
                   1980: #                          rid           - Resource id.
                   1981: #    $client             - socket open on the client.
                   1982: #
                   1983: # Returns:
                   1984: #      1  indicating the caller should not yet exit.
                   1985: # Side-effects:
                   1986: #   Writes a reply to the client.
                   1987: #
                   1988: sub RestoreHandler {
1.178.2.4! albertel 1989:     my $cmd     = shift;
        !          1990:     my $tail    = shift;
        !          1991:     my $client  = shift;
        !          1992: 
        !          1993:     my $userinput = "$cmd:$tail";	# Only used for logging purposes.
        !          1994: 
        !          1995:     my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
        !          1996:     $namespace=~s/\//\_/g;
        !          1997:     $namespace=~s/\W//g;
        !          1998:     chomp($rid);
        !          1999:     my $proname=propath($udom,$uname);
        !          2000:     my $qresult='';
        !          2001:     my %hash;
        !          2002:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
        !          2003: 	    &GDBM_READER(),0640)) {
        !          2004: 	my $version=$hash{"version:$rid"};
        !          2005: 	$qresult.="version=$version&";
        !          2006: 	my $scope;
        !          2007: 	for ($scope=1;$scope<=$version;$scope++) {
        !          2008: 	    my $vkeys=$hash{"$scope:keys:$rid"};
        !          2009: 	    my @keys=split(/:/,$vkeys);
        !          2010: 	    my $key;
        !          2011: 	    $qresult.="$scope:keys=$vkeys&";
        !          2012: 	    foreach $key (@keys) {
        !          2013: 		$qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
        !          2014: 	    }                                  
        !          2015: 	}
        !          2016: 	if (untie(%hash)) {
        !          2017: 	    $qresult=~s/\&$//;
        !          2018: 	    Reply( $client, "$qresult\n", $userinput);
        !          2019: 	} else {
        !          2020: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          2021: 		    "while attempting restore\n", $userinput);
        !          2022: 	}
        !          2023:     } else {
        !          2024: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          2025: 		"while attempting restore\n", $userinput);
        !          2026:     }
1.178.2.1  foxr     2027:   
1.178.2.4! albertel 2028:     return 1;
1.178.2.1  foxr     2029: 
                   2030: 
                   2031: }
                   2032: RegisterHandler("restor", \&RestoreHandler, 0,1,0);
                   2033: 
                   2034: #
                   2035: #   Add a chat message to to a discussion board.
                   2036: #
                   2037: # Parameters:
                   2038: #    $cmd                - Request keyword.
                   2039: #    $tail               - Tail of the command. A colon separated list
                   2040: #                          containing:
                   2041: #                          cdom    - Domain on which the chat board lives
                   2042: #                          cnum    - Identifier of the discussion group.
                   2043: #                          post    - Body of the posting.
                   2044: #   $client              - Socket open on the client.
                   2045: # Returns:
                   2046: #   1    - Indicating caller should keep on processing.
                   2047: #
                   2048: # Side-effects:
                   2049: #   writes a reply to the client.
                   2050: #
                   2051: #
                   2052: sub SendChatHandler {
1.178.2.4! albertel 2053:     my $cmd     = shift;
        !          2054:     my $tail    = shift;
        !          2055:     my $client  = shift;
        !          2056:     
        !          2057:     my $userinput = "$cmd:$tail";
1.178.2.1  foxr     2058: 
1.178.2.4! albertel 2059:     my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
        !          2060:     &chatadd($cdom,$cnum,$newpost);
        !          2061:     Reply($client, "ok\n", $userinput);
1.178.2.1  foxr     2062: 
1.178.2.4! albertel 2063:     return 1;
1.178.2.1  foxr     2064: }
                   2065: RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0);
                   2066: #
                   2067: #   Retrieve the set of chat messagss from a discussion board.
                   2068: #
                   2069: #  Parameters:
                   2070: #    $cmd             - Command keyword that initiated the request.
                   2071: #    $tail            - Remainder of the request after the command
                   2072: #                       keyword.  In this case a colon separated list of
                   2073: #                       chat domain    - Which discussion board.
                   2074: #                       chat id        - Discussion thread(?)
                   2075: #                       domain/user    - Authentication domain and username
                   2076: #                                        of the requesting person.
                   2077: #   $client           - Socket open on the client program.
                   2078: # Returns:
                   2079: #    1     - continue processing
                   2080: # Side effects:
                   2081: #    Response is written to the client.
                   2082: #
                   2083: sub RetrieveChatHandler {
1.178.2.4! albertel 2084:     my $cmd      = shift;
        !          2085:     my $tail     = shift;
        !          2086:     my $client   = shift;
        !          2087: 
        !          2088:     my $userinput = "$cmd:$tail";
        !          2089: 
        !          2090:     my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
        !          2091:     my $reply='';
        !          2092:     foreach (&getchat($cdom,$cnum,$udom,$uname)) {
        !          2093: 	$reply.=&escape($_).':';
        !          2094:     }
        !          2095:     $reply=~s/\:$//;
        !          2096:     Reply($client, $reply."\n", $userinput);
1.178.2.1  foxr     2097: 
                   2098: 
1.178.2.4! albertel 2099:     return 1;
1.178.2.1  foxr     2100: }
                   2101: RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0);
                   2102: #
                   2103: #  Initiate a query of an sql database.  SQL query repsonses get put in
                   2104: #  a file for later retrieval.  This prevents sql query results from
                   2105: #  bottlenecking the system.  Note that with loncnew, perhaps this is
                   2106: #  less of an issue since multiple outstanding requests can be concurrently
                   2107: #  serviced.
                   2108: #
                   2109: #  Parameters:
                   2110: #     $cmd       - COmmand keyword that initiated the request.
                   2111: #     $tail      - Remainder of the command after the keyword.
                   2112: #                  For this function, this consists of a query and
                   2113: #                  3 arguments that are self-documentingly labelled
                   2114: #                  in the original arg1, arg2, arg3.
                   2115: #     $client    - Socket open on the client.
                   2116: # Return:
                   2117: #    1   - Indicating processing should continue.
                   2118: # Side-effects:
                   2119: #    a reply is written to $client.
                   2120: #
                   2121: sub SendQueryHandler {
1.178.2.4! albertel 2122:     my $cmd     = shift;
        !          2123:     my $tail    = shift;
        !          2124:     my $client  = shift;
        !          2125: 
        !          2126:     my $userinput = "$cmd:$tail";
        !          2127: 
        !          2128:     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
        !          2129:     $query=~s/\n*$//g;
        !          2130:     Reply($client, "". sqlreply("$clientname\&$query".
        !          2131: 				"\&$arg1"."\&$arg2"."\&$arg3")."\n",
        !          2132: 	  $userinput);
        !          2133:     
        !          2134:     return 1;
1.178.2.1  foxr     2135: }
                   2136: RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0);
                   2137: 
                   2138: #
                   2139: #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
                   2140: #   The query is submitted via a "querysend" transaction.
                   2141: #   There it is passed on to the lonsql daemon, queued and issued to
                   2142: #   mysql.
                   2143: #     This transaction is invoked when the sql transaction is complete
                   2144: #   it stores the query results in flie and indicates query completion.
                   2145: #   presumably local software then fetches this response... I'm guessing
                   2146: #   the sequence is: lonc does a querysend, we ask lonsql to do it.
                   2147: #   lonsql on completion of the query interacts with the lond of our
                   2148: #   client to do a query reply storing two files:
                   2149: #    - id     - The results of the query.
                   2150: #    - id.end - Indicating the transaction completed. 
                   2151: #    NOTE: id is a unique id assigned to the query and querysend time.
                   2152: # Parameters:
                   2153: #    $cmd        - Command keyword that initiated this request.
                   2154: #    $tail       - Remainder of the tail.  In this case that's a colon
                   2155: #                  separated list containing the query Id and the 
                   2156: #                  results of the query.
                   2157: #    $client     - Socket open on the client.
                   2158: # Return:
                   2159: #    1           - Indicating that we should continue processing.
                   2160: # Side effects:
                   2161: #    ok written to the client.
                   2162: #
                   2163: sub ReplyQueryHandler {
1.178.2.4! albertel 2164:     my $cmd    = shift;
        !          2165:     my $tail   = shift;
        !          2166:     my $client = shift;
        !          2167: 
        !          2168:     my $userinput = "$cmd:$tail";
        !          2169: 
        !          2170:     my ($cmd,$id,$reply)=split(/:/,$userinput); 
        !          2171:     my $store;
        !          2172:     my $execdir=$perlvar{'lonDaemons'};
        !          2173:     if ($store=IO::File->new(">$execdir/tmp/$id")) {
        !          2174: 	$reply=~s/\&/\n/g;
        !          2175: 	print $store $reply;
        !          2176: 	close $store;
        !          2177: 	my $store2=IO::File->new(">$execdir/tmp/$id.end");
        !          2178: 	print $store2 "done\n";
        !          2179: 	close $store2;
        !          2180: 	Reply($client, "ok\n", $userinput);
        !          2181:     } else {
        !          2182: 	Failure($client, "error: ".($!+0)
        !          2183: 		." IO::File->new Failed ".
        !          2184: 		"while attempting queryreply\n", $userinput);
        !          2185:     }
1.178.2.1  foxr     2186:  
                   2187: 
1.178.2.4! albertel 2188:     return 1;
1.178.2.1  foxr     2189: }
                   2190: RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0);
                   2191: #
                   2192: #  Process the courseidput query.  Not quite sure what this means
                   2193: #  at the system level sense.  It appears a gdbm file in the 
                   2194: #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
                   2195: #  a set of entries made in that database.
                   2196: #
                   2197: # Parameters:
                   2198: #   $cmd      - The command keyword that initiated this request.
                   2199: #   $tail     - Tail of the command.  In this case consists of a colon
                   2200: #               separated list contaning the domain to apply this to and
                   2201: #               an ampersand separated list of keyword=value pairs.
                   2202: #   $client   - Socket open on the client.
                   2203: # Returns:
                   2204: #   1    - indicating that processing should continue
                   2205: #
                   2206: # Side effects:
                   2207: #   reply is written to the client.
                   2208: #
                   2209: sub PutCourseIdHandler {
1.178.2.4! albertel 2210:     my $cmd    = shift;
        !          2211:     my $tail   = shift;
        !          2212:     my $client = shift;
1.178.2.1  foxr     2213: 
1.178.2.4! albertel 2214:     my $userinput = "$cmd:$tail";
        !          2215: 
        !          2216:     my ($udom,$what)=split(/:/,$tail);
        !          2217:     chomp($what);
        !          2218:     $udom=~s/\W//g;
        !          2219:     my $proname=
        !          2220: 	"$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
        !          2221:     my $now=time;
        !          2222:     my @pairs=split(/\&/,$what);
        !          2223:     my %hash;
        !          2224:     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
        !          2225: 	foreach my $pair (@pairs) {
        !          2226: 	    my ($key,$value)=split(/=/,$pair);
        !          2227: 	    $hash{$key}=$value.':'.$now;
        !          2228: 	}
        !          2229: 	if (untie(%hash)) {
        !          2230: 	    Reply($client, "ok\n", $userinput);
        !          2231: 	} else {
        !          2232: 	    Failure( $client, "error: ".($!+0)
        !          2233: 		     ." untie(GDBM) Failed ".
        !          2234: 		     "while attempting courseidput\n", $userinput);
        !          2235: 	}
        !          2236:     } else {
        !          2237: 	Failure( $client, "error: ".($!+0)
        !          2238: 		 ." tie(GDBM) Failed ".
        !          2239: 		 "while attempting courseidput\n", $userinput);
        !          2240:     }
        !          2241: 
        !          2242:     return 1;
1.178.2.1  foxr     2243: }
                   2244: RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0);
                   2245: 
                   2246: #  Retrieves the value of a course id resource keyword pattern
                   2247: #  defined since a starting date.  Both the starting date and the
                   2248: #  keyword pattern are optional.  If the starting date is not supplied it
                   2249: #  is treated as the beginning of time.  If the pattern is not found,
                   2250: #  it is treatred as "." matching everything.
                   2251: #
                   2252: #  Parameters:
                   2253: #     $cmd     - Command keyword that resulted in us being dispatched.
                   2254: #     $tail    - The remainder of the command that, in this case, consists
                   2255: #                of a colon separated list of:
                   2256: #                 domain   - The domain in which the course database is 
                   2257: #                            defined.
                   2258: #                 since    - Optional parameter describing the minimum
                   2259: #                            time of definition(?) of the resources that
                   2260: #                            will match the dump.
                   2261: #                 description - regular expression that is used to filter
                   2262: #                            the dump.  Only keywords matching this regexp
                   2263: #                            will be used.
                   2264: #     $client  - The socket open on the client.
                   2265: # Returns:
                   2266: #    1     - Continue processing.
                   2267: # Side Effects:
                   2268: #   a reply is written to $client.
                   2269: sub DumpCourseIdHandler {
1.178.2.4! albertel 2270:     my $cmd    = shift;
        !          2271:     my $tail   = shift;
        !          2272:     my $client = shift;
        !          2273: 
        !          2274:     my $userinput = "$cmd:$tail";
        !          2275: 
        !          2276:     my ($udom,$since,$description) =split(/:/,$tail);
        !          2277:     if (defined($description)) {
        !          2278: 	$description=&unescape($description);
        !          2279:     } else {
        !          2280: 	$description='.';
        !          2281:     }
        !          2282:     unless (defined($since)) { $since=0; }
        !          2283:     my $qresult='';
        !          2284:     my $proname = "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
        !          2285:     my %hash;
        !          2286:     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
        !          2287: 	while (my ($key,$value) = each(%hash)) {
        !          2288: 	    my ($descr,$lasttime)=split(/\:/,$value);
        !          2289: 	    if ($lasttime<$since) { 
        !          2290: 		next; 
        !          2291: 	    }
        !          2292: 	    if ($description eq '.') {
        !          2293: 		$qresult.=$key.'='.$descr.'&';
        !          2294: 	    } else {
        !          2295: 		my $unescapeVal = &unescape($descr);
        !          2296: 		if (eval('$unescapeVal=~/$description/i')) {
        !          2297: 		    $qresult.="$key=$descr&";
        !          2298: 		}
        !          2299: 	    }
        !          2300: 	}
        !          2301: 	if (untie(%hash)) {
        !          2302: 	    chop($qresult);
        !          2303: 	    Reply($client, "$qresult\n", $userinput);
        !          2304: 	} else {
        !          2305: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          2306: 		    "while attempting courseiddump\n", $userinput);
        !          2307: 	}
        !          2308:     } else {
        !          2309: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          2310: 		"while attempting courseiddump\n", $userinput);
        !          2311:     }
1.178.2.1  foxr     2312: 
                   2313: 
1.178.2.4! albertel 2314:     return 1;
1.178.2.1  foxr     2315: }
                   2316: RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);
                   2317: #
                   2318: #  Puts an id to a domains id database. 
                   2319: #
                   2320: #  Parameters:
                   2321: #   $cmd     - The command that triggered us.
                   2322: #   $tail    - Remainder of the request other than the command. This is a 
                   2323: #              colon separated list containing:
                   2324: #              $domain  - The domain for which we are writing the id.
                   2325: #              $pairs  - The id info to write... this is and & separated list
                   2326: #                        of keyword=value.
                   2327: #   $client  - Socket open on the client.
                   2328: #  Returns:
                   2329: #    1   - Continue processing.
                   2330: #  Side effects:
                   2331: #     reply is written to $client.
                   2332: #
                   2333: sub PutIdHandler {
1.178.2.4! albertel 2334:     my $cmd    = shift;
        !          2335:     my $tail   = shift;
        !          2336:     my $client = shift;
        !          2337: 
        !          2338:     my $userinput = "$cmd:$tail";
        !          2339: 
        !          2340:     my ($udom,$what)=split(/:/,$tail);
        !          2341:     chomp($what);
        !          2342:     $udom=~s/\W//g;
        !          2343:     my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
        !          2344:     my $now=time;
        !          2345:     {
        !          2346: 	my $hfh;
        !          2347: 	if ($hfh=IO::File->new(">>$proname.hist")) { 
        !          2348: 	    print $hfh "P:$now:$what\n"; 
        !          2349: 	}
        !          2350:     }
        !          2351:     my @pairs=split(/\&/,$what);
        !          2352:     my %hash;
        !          2353:     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
        !          2354: 	foreach my $pair (@pairs) {
        !          2355: 	    my ($key,$value)=split(/=/,$pair);
        !          2356: 	    $hash{$key}=$value;
        !          2357: 	}
        !          2358: 	if (untie(%hash)) {
        !          2359: 	    Reply($client, "ok\n", $userinput);
        !          2360: 	} else {
        !          2361: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          2362: 		    "while attempting idput\n", $userinput);
        !          2363: 	}
        !          2364:     } else {
        !          2365: 	Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          2366: 		 "while attempting idput\n", $userinput);
1.178.2.1  foxr     2367:     }
                   2368: 
1.178.2.4! albertel 2369:     return 1;
1.178.2.1  foxr     2370: }
                   2371: 
                   2372: RegisterHandler("idput", \&PutIdHandler, 0, 1, 0);
                   2373: #
                   2374: #  Retrieves a set of id values from the id database.
                   2375: #  Returns an & separated list of results, one for each requested id to the
                   2376: #  client.
                   2377: #
                   2378: # Parameters:
                   2379: #   $cmd       - Command keyword that caused us to be dispatched.
                   2380: #   $tail      - Tail of the command.  Consists of a colon separated:
                   2381: #               domain - the domain whose id table we dump
                   2382: #               ids      Consists of an & separated list of
                   2383: #                        id keywords whose values will be fetched.
                   2384: #                        nonexisting keywords will have an empty value.
                   2385: #   $client    - Socket open on the client.
                   2386: #
                   2387: # Returns:
                   2388: #    1 - indicating processing should continue.
                   2389: # Side effects:
                   2390: #   An & separated list of results is written to $client.
                   2391: #
                   2392: sub GetIdHandler {
1.178.2.4! albertel 2393:     my $cmd    = shift;
        !          2394:     my $tail   = shift;
        !          2395:     my $client = shift;
        !          2396: 
        !          2397:     my $userinput = "$client:$tail";
        !          2398: 
        !          2399:     my ($udom,$what)=split(/:/,$tail);
        !          2400:     chomp($what);
        !          2401:     $udom=~s/\W//g;
        !          2402:     my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
        !          2403:     my @queries=split(/\&/,$what);
        !          2404:     my $qresult='';
        !          2405:     my %hash;
        !          2406:     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
        !          2407: 	for (my $i=0;$i<=$#queries;$i++) {
        !          2408: 	    $qresult.="$hash{$queries[$i]}&";
        !          2409: 	}
        !          2410: 	if (untie(%hash)) {
        !          2411: 	    $qresult=~s/\&$//;
        !          2412: 	    Reply($client, "$qresult\n", $userinput);
        !          2413: 	} else {
        !          2414: 	    Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          2415: 		     "while attempting idget\n",$userinput);
        !          2416: 	}
        !          2417:     } else {
        !          2418: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          2419: 		"while attempting idget\n",$userinput);
        !          2420:     }
1.178.2.1  foxr     2421: 
1.178.2.4! albertel 2422:     return 1;
1.178.2.1  foxr     2423: }
1.178.2.3  foxr     2424: 
1.178.2.1  foxr     2425: RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);
1.178.2.3  foxr     2426: #
                   2427: #  Process the tmpput command I'm not sure what this does.. Seems to
                   2428: #  create a file in the lonDaemons/tmp directory of the form $id.tmp
                   2429: # where Id is the client's ip concatenated with a sequence number.
                   2430: # The file will contain some value that is passed in.  Is this e.g.
                   2431: # a login token?
                   2432: #
                   2433: # Parameters:
                   2434: #    $cmd     - The command that got us dispatched.
                   2435: #    $tail    - The remainder of the request following $cmd:
                   2436: #               In this case this will be the contents of the file.
                   2437: #    $client  - Socket connected to the client.
                   2438: # Returns:
                   2439: #    1 indicating processing can continue.
                   2440: # Side effects:
                   2441: #   A file is created in the local filesystem.
                   2442: #   A reply is sent to the client.
                   2443: sub TmpPutHandler {
1.178.2.4! albertel 2444:     my $cmd       = shift;
        !          2445:     my $what      = shift;
        !          2446:     my $client    = shift;
        !          2447: 
        !          2448:     my $userinput = "$cmd:$what";	# Reconstruct for logging.
        !          2449: 
        !          2450: 
        !          2451:     my $store;
        !          2452:     $tmpsnum++;
        !          2453:     my $id=$$.'_'.$clientip.'_'.$tmpsnum;
        !          2454:     $id=~s/\W/\_/g;
        !          2455:     $what=~s/\n//g;
        !          2456:     my $execdir=$perlvar{'lonDaemons'};
        !          2457:     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
        !          2458: 	print $store $what;
        !          2459: 	close $store;
        !          2460: 	Reply($client, "$id\n", $userinput);
        !          2461:     } else {
        !          2462: 	Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
        !          2463: 		 "while attempting tmpput\n", $userinput);
        !          2464:     }
        !          2465:     return 1;
1.178.2.3  foxr     2466:   
                   2467: }
                   2468: RegisterHandler("tmpput", \&TmpPutHandler, 0, 1, 0);
                   2469: 
                   2470: #   Processes the tmpget command.  This command returns the contents
                   2471: #  of a temporary resource file(?) created via tmpput.
                   2472: #
                   2473: # Paramters:
                   2474: #    $cmd      - Command that got us dispatched.
                   2475: #    $id       - Tail of the command, contain the id of the resource
                   2476: #                we want to fetch.
                   2477: #    $client   - socket open on the client.
                   2478: # Return:
                   2479: #    1         - Inidcating processing can continue.
                   2480: # Side effects:
                   2481: #   A reply is sent to the client.
                   2482: 
                   2483: #
                   2484: sub TmpGetHandler {
1.178.2.4! albertel 2485:     my $cmd       = shift;
        !          2486:     my $id        = shift;
        !          2487:     my $client    = shift;
        !          2488:     my $userinput = "$cmd:$id"; 
        !          2489: 
        !          2490:     chomp($id);
        !          2491:     $id=~s/\W/\_/g;
        !          2492:     my $store;
        !          2493:     my $execdir=$perlvar{'lonDaemons'};
        !          2494:     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
        !          2495: 	my $reply=<$store>;
        !          2496: 	Reply( $client, "$reply\n", $userinput);
        !          2497: 	close $store;
        !          2498:     } else {
        !          2499: 	Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
        !          2500: 		 "while attempting tmpget\n", $userinput);
        !          2501:     }
1.178.2.3  foxr     2502: 
1.178.2.4! albertel 2503:     return 1;
1.178.2.3  foxr     2504: }
                   2505: RegisterHandler("tmpget", \&TmpGetHandler, 0, 1, 0);
                   2506: #
                   2507: #  Process the tmpdel command.  This command deletes a temp resource
                   2508: #  created by the tmpput command.
                   2509: #
                   2510: # Parameters:
                   2511: #   $cmd      - Command that got us here.
                   2512: #   $id       - Id of the temporary resource created.
                   2513: #   $client   - socket open on the client process.
                   2514: #
                   2515: # Returns:
                   2516: #   1     - Indicating processing should continue.
                   2517: # Side Effects:
                   2518: #   A file is deleted
                   2519: #   A reply is sent to the client.
                   2520: sub TmpDelHandler {
1.178.2.4! albertel 2521:     my $cmd      = shift;
        !          2522:     my $id       = shift;
        !          2523:     my $client   = shift;
        !          2524: 
        !          2525:     my $userinput= "$cmd:$id";
1.178.2.3  foxr     2526: 
1.178.2.4! albertel 2527:     chomp($id);
        !          2528:     $id=~s/\W/\_/g;
        !          2529:     my $execdir=$perlvar{'lonDaemons'};
        !          2530:     if (unlink("$execdir/tmp/$id.tmp")) {
        !          2531: 	Reply($client, "ok\n", $userinput);
        !          2532:     } else {
        !          2533: 	Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
        !          2534: 		 "while attempting tmpdel\n", $userinput);
        !          2535:     }
        !          2536: 
        !          2537:     return 1;
1.178.2.3  foxr     2538: 
                   2539: }
                   2540: RegisterHandler("tmpdel", \&TmpDelHandler, 0, 1, 0);
                   2541: #
                   2542: #   ls  - list the contents of a directory.  For each file in the
                   2543: #    selected directory the filename followed by the full output of
                   2544: #    the stat function is returned.  The returned info for each
                   2545: #    file are separated by ':'.  The stat fields are separated by &'s.
                   2546: # Parameters:
                   2547: #    $cmd        - The command that dispatched us (ls).
                   2548: #    $ulsdir     - The directory path to list... I'm not sure what this
                   2549: #                  is relative as things like ls:. return e.g.
                   2550: #                  no_such_dir.
                   2551: #    $client     - Socket open on the client.
                   2552: # Returns:
                   2553: #     1 - indicating that the daemon should not disconnect.
                   2554: # Side Effects:
                   2555: #   The reply is written to  $client.
                   2556: #
                   2557: sub LsHandler {
1.178.2.4! albertel 2558:     my $cmd     = shift;
        !          2559:     my $ulsdir  = shift;
        !          2560:     my $client  = shift;
1.178.2.3  foxr     2561: 
1.178.2.4! albertel 2562:     my $userinput = "$cmd:$ulsdir";
1.178.2.3  foxr     2563: 
1.178.2.4! albertel 2564:     my $ulsout='';
        !          2565:     my $ulsfn;
        !          2566:     if (-e $ulsdir) {
        !          2567: 	if(-d $ulsdir) {
        !          2568: 	    if (opendir(LSDIR,$ulsdir)) {
        !          2569: 		while ($ulsfn=readdir(LSDIR)) {
        !          2570: 		    my @ulsstats=stat($ulsdir.'/'.$ulsfn);
        !          2571: 		    $ulsout.=$ulsfn.'&'.
        !          2572: 			join('&',@ulsstats).':';
        !          2573: 		}
        !          2574: 		closedir(LSDIR);
        !          2575: 	    }
        !          2576: 	} else {
        !          2577: 	    my @ulsstats=stat($ulsdir);
        !          2578: 	    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
        !          2579: 	}
        !          2580:     } else {
        !          2581: 	$ulsout='no_such_dir';
        !          2582:     }
        !          2583:     if ($ulsout eq '') { $ulsout='empty'; }
        !          2584:     Reply($client, "$ulsout\n", $userinput);
        !          2585: 
        !          2586: 
        !          2587:     return 1;
1.178.2.3  foxr     2588: }
                   2589: RegisterHandler("ls", \&LsHandler, 0, 1, 0);
                   2590: 
                   2591: 
                   2592: #
                   2593: #   Processes the setannounce command.  This command
                   2594: #   creates a file named announce.txt in the top directory of
                   2595: #   the documentn root and sets its contents.  The announce.txt file is
                   2596: #   printed in its entirety at the LonCAPA login page.  Note:
                   2597: #   once the announcement.txt fileis created it cannot be deleted.
                   2598: #   However, setting the contents of the file to empty removes the
                   2599: #   announcement from the login page of loncapa so who cares.
                   2600: #
                   2601: # Parameters:
                   2602: #    $cmd          - The command that got us dispatched.
                   2603: #    $announcement - The text of the announcement.
                   2604: #    $client       - Socket open on the client process.
                   2605: # Retunrns:
                   2606: #   1             - Indicating request processing should continue
                   2607: # Side Effects:
                   2608: #   The file {DocRoot}/announcement.txt is created.
                   2609: #   A reply is sent to $client.
                   2610: #
                   2611: sub SetAnnounceHandler {
1.178.2.4! albertel 2612:     my $cmd          = shift;
        !          2613:     my $announcement = shift;
        !          2614:     my $client       = shift;
1.178.2.3  foxr     2615:   
1.178.2.4! albertel 2616:     my $userinput    = "$cmd:$announcement";
1.178.2.3  foxr     2617: 
1.178.2.4! albertel 2618:     chomp($announcement);
        !          2619:     $announcement=&unescape($announcement);
        !          2620:     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
        !          2621: 				'/announcement.txt')) {
        !          2622: 	print $store $announcement;
        !          2623: 	close $store;
        !          2624: 	Reply($client, "ok\n", $userinput);
        !          2625:     } else {
        !          2626: 	Failure($client, "error: ".($!+0)."\n", $userinput);
        !          2627:     }
1.178.2.3  foxr     2628: 
1.178.2.4! albertel 2629:     return 1;
1.178.2.3  foxr     2630: }
                   2631: RegisterHandler("setannounce", \&SetAnnounceHandler, 0, 1, 0);
                   2632: 
                   2633: #
                   2634: #  Return the version of the daemon.  This can be used to determine
                   2635: #  the compatibility of cross version installations or, alternatively to
                   2636: #  simply know who's out of date and who isn't.  Note that the version
                   2637: #  is returned concatenated with the tail.
                   2638: # Parameters:
                   2639: #   $cmd        - the request that dispatched to us.
                   2640: #   $tail       - Tail of the request (client's version?).
                   2641: #   $client     - Socket open on the client.
                   2642: #Returns:
                   2643: #   1 - continue processing requests.
                   2644: # Side Effects:
                   2645: #   Replies with version to $client.
                   2646: sub GetVersionHandler {
1.178.2.4! albertel 2647:     my $client     = shift;
        !          2648:     my $tail       = shift;
        !          2649:     my $client     = shift;
        !          2650:     my $userinput  = $client;
        !          2651:     
        !          2652:     Reply($client, &version($userinput)."\n", $userinput);
1.178.2.3  foxr     2653: 
                   2654: 
1.178.2.4! albertel 2655:     return 1;
1.178.2.3  foxr     2656: }
                   2657: RegisterHandler("version", \&GetVersionHandler, 0, 1, 0);
                   2658: 
                   2659: #  Set the current host and domain.  This is used to support
                   2660: #  multihomed systems.  Each IP of the system, or even separate daemons
                   2661: #  on the same IP can be treated as handling a separate lonCAPA virtual
                   2662: #  machine.  This command selects the virtual lonCAPA.  The client always
                   2663: #  knows the right one since it is lonc and it is selecting the domain/system
                   2664: #  from the hosts.tab file.
                   2665: # Parameters:
                   2666: #    $cmd      - Command that dispatched us.
                   2667: #    $tail     - Tail of the command (domain/host requested).
                   2668: #    $socket   - Socket open on the client.
                   2669: #
                   2670: # Returns:
                   2671: #     1   - Indicates the program should continue to process requests.
                   2672: # Side-effects:
                   2673: #     The default domain/system context is modified for this daemon.
                   2674: #     a reply is sent to the client.
                   2675: #
                   2676: sub SelectHostHandler {
1.178.2.4! albertel 2677:     my $cmd        = shift;
        !          2678:     my $tail       = shift;
        !          2679:     my $socket     = shift;
1.178.2.3  foxr     2680:   
1.178.2.4! albertel 2681:     my $userinput  ="$cmd:$tail";
1.178.2.3  foxr     2682: 
1.178.2.4! albertel 2683:     Reply($client, &sethost($userinput)."\n", $userinput);
1.178.2.3  foxr     2684: 
                   2685: 
1.178.2.4! albertel 2686:     return 1;
1.178.2.3  foxr     2687: }
                   2688: RegisterHandler("sethost", \&SelectHostHandler, 0, 1, 0);
                   2689: 
                   2690: #  Process a request to exit:
                   2691: #   - "bye" is sent to the client.
                   2692: #   - The client socket is shutdown and closed.
                   2693: #   - We indicate to the caller that we should exit.
                   2694: # Formal Parameters:
                   2695: #   $cmd                - The command that got us here.
                   2696: #   $tail               - Tail of the command (empty).
                   2697: #   $client             - Socket open on the tail.
                   2698: # Returns:
                   2699: #   0      - Indicating the program should exit!!
                   2700: #
                   2701: sub ExitHandler {
1.178.2.4! albertel 2702:     my $cmd     = shift;
        !          2703:     my $tail    = shift;
        !          2704:     my $client  = shift;
        !          2705: 
        !          2706:     my $userinput = "$cmd:$tail";
        !          2707: 
        !          2708:     &logthis("Client $clientip ($clientname) hanging up: $userinput");
        !          2709:     Reply($client, "bye\n", $userinput);
        !          2710:     $client->shutdown(2);        # shutdown the socket forcibly.
        !          2711:     $client->close();
1.178.2.3  foxr     2712: 
1.178.2.4! albertel 2713:     return 0;
1.178.2.3  foxr     2714: }
                   2715: RegisterHandler("exit", \&ExitHandler, 0, 1,1);
                   2716: RegisterHandler("init", \&ExitHandler, 0, 1,1);	# RE-init is like exit.
                   2717: RegisterHandler("quit", \&ExitHandler, 0, 1,1); # I like this too!
1.178.2.1  foxr     2718: #------------------------------------------------------------------------------------
                   2719: #
                   2720: #   Process a Request.  Takes a request from the client validates
                   2721: #   it and performs the operation requested by it.  Returns
                   2722: #   a response to the client.
                   2723: #
                   2724: #  Parameters:
                   2725: #      request      - A string containing the user's request.
                   2726: #  Returns:
                   2727: #      0            - Requested to exit, caller should shut down.
                   2728: #      1            - Accept additional requests from the client.
                   2729: #
                   2730: sub ProcessRequest {
1.178.2.4! albertel 2731:     my $Request      = shift;
        !          2732:     my $KeepGoing    = 1;	# Assume we're not asked to stop.
1.178.2.1  foxr     2733:     
1.178.2.4! albertel 2734:     my $wasenc=0;
        !          2735:     my $userinput = $Request;   # for compatibility with oldcode <yeach>
1.178.2.1  foxr     2736: 
                   2737: 
                   2738: # ------------------------------------------------------------ See if encrypted
                   2739:    
1.178.2.4! albertel 2740:     if($userinput =~ /^enc/) {
        !          2741: 	$wasenc = 1;
        !          2742: 	$userinput = Decipher($userinput);
        !          2743: 	if(! $userinput) {
        !          2744: 	    Failure($client,"error:Encrypted data without negotiating key");
        !          2745: 	    return 0;                      # Break off with this imposter.
        !          2746: 	}
        !          2747:     }
        !          2748:     # Split off the request keyword from the rest of the stuff.
1.178.2.1  foxr     2749:    
1.178.2.4! albertel 2750:     my ($command, $tail) = split(/:/, $userinput, 2);
1.178.2.2  foxr     2751: 
1.178.2.4! albertel 2752:     Debug("Command received: $command, encoded = $wasenc");
1.178.2.2  foxr     2753: 
1.178.2.1  foxr     2754:    
                   2755: # ------------------------------------------------------------- Normal commands
                   2756: 
1.178.2.4! albertel 2757:     # 
        !          2758:     #   If the command is in the hash, then execute it via the hash dispatch:
        !          2759:     #
        !          2760:     if(defined $Dispatcher{$command}) {
        !          2761: 
        !          2762: 	my $DispatchInfo = $Dispatcher{$command};
        !          2763: 	my $Handler      = $$DispatchInfo[0];
        !          2764: 	my $NeedEncode   = $$DispatchInfo[1];
        !          2765: 	my $ClientTypes  = $$DispatchInfo[2];
        !          2766: 	Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes");
1.178.2.1  foxr     2767:       
1.178.2.4! albertel 2768: 	#  Validate the request:
1.178.2.1  foxr     2769:       
1.178.2.4! albertel 2770: 	my $ok = 1;
        !          2771: 	my $requesterprivs = 0;
        !          2772: 	if(isClient()) {
        !          2773: 	    $requesterprivs |= $CLIENT_OK;
        !          2774: 	}
        !          2775: 	if(isManager()) {
        !          2776: 	    $requesterprivs |= $MANAGER_OK;
        !          2777: 	}
        !          2778: 	if($NeedEncode && (!$wasenc)) {
        !          2779: 	    Debug("Must encode but wasn't: $NeedEncode $wasenc");
        !          2780: 	    $ok = 0;
        !          2781: 	}
        !          2782: 	if(($ClientTypes & $requesterprivs) == 0) {
        !          2783: 	    Debug("Client not privileged to do this operation");
        !          2784: 	    $ok = 0;
        !          2785: 	}
        !          2786: 
        !          2787: 	if($ok) {
        !          2788: 	    Debug("Dispatching to handler $command $tail");
        !          2789: 	    $KeepGoing = &$Handler($command, $tail, $client);
        !          2790: 	} else {
        !          2791: 	    Debug("Refusing to dispatch because ok is false");
        !          2792: 	    Failure($client, "refused", $userinput);
        !          2793: 	}
1.161     foxr     2794: 
                   2795: 
1.178.2.1  foxr     2796: # ------------------------------------------------------------- unknown command
1.97      foxr     2797: 
1.178.2.4! albertel 2798:     } else {
1.178.2.1  foxr     2799: 	# unknown command
1.178.2.4! albertel 2800: 	Failure($client, "unknown_cmd\n", $userinput);
        !          2801:     }
1.97      foxr     2802: 
1.178.2.1  foxr     2803:     return $KeepGoing;
                   2804: }
1.97      foxr     2805: 
1.96      foxr     2806: 
                   2807: #
1.140     foxr     2808: #   GetCertificate: Given a transaction that requires a certificate,
                   2809: #   this function will extract the certificate from the transaction
                   2810: #   request.  Note that at this point, the only concept of a certificate
                   2811: #   is the hostname to which we are connected.
                   2812: #
                   2813: #   Parameter:
                   2814: #      request   - The request sent by our client (this parameterization may
                   2815: #                  need to change when we really use a certificate granting
                   2816: #                  authority.
                   2817: #
                   2818: sub GetCertificate {
                   2819:     my $request = shift;
                   2820: 
                   2821:     return $clientip;
                   2822: }
1.161     foxr     2823: 
                   2824: 
                   2825: 
1.156     foxr     2826: #
                   2827: #   ReadManagerTable: Reads in the current manager table. For now this is
                   2828: #                     done on each manager authentication because:
                   2829: #                     - These authentications are not frequent
                   2830: #                     - This allows dynamic changes to the manager table
                   2831: #                       without the need to signal to the lond.
                   2832: #
                   2833: 
                   2834: sub ReadManagerTable {
                   2835: 
                   2836:     #   Clean out the old table first..
                   2837: 
1.178.2.4! albertel 2838:     foreach my $key (keys %managers) {
        !          2839: 	delete $managers{$key};
        !          2840:     }
        !          2841: 
        !          2842:     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
        !          2843:     if (!open (MANAGERS, $tablename)) {
        !          2844: 	logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
        !          2845: 	return;
        !          2846:     }
        !          2847:     while(my $host = <MANAGERS>) {
        !          2848: 	chomp($host);
        !          2849: 	if ($host =~ "^#") {                  # Comment line.
        !          2850: 	    logthis('<font color="green"> Skipping line: '. "$host</font>\n");
        !          2851: 	    next;
        !          2852: 	}
        !          2853: 	if (!defined $hostip{$host}) { # This is a non cluster member
1.161     foxr     2854: 	    #  The entry is of the form:
                   2855: 	    #    cluname:hostname
                   2856: 	    #  cluname - A 'cluster hostname' is needed in order to negotiate
                   2857: 	    #            the host key.
                   2858: 	    #  hostname- The dns name of the host.
                   2859: 	    #
1.178.2.4! albertel 2860: 	    my($cluname, $dnsname) = split(/:/, $host);
        !          2861: 	    
        !          2862: 	    my $ip = gethostbyname($dnsname);
        !          2863: 	    if(defined($ip)) {                 # bad names don't deserve entry.
        !          2864: 		my $hostip = inet_ntoa($ip);
        !          2865: 		$managers{$hostip} = $cluname;
        !          2866: 		logthis('<font color="green"> registering manager '.
        !          2867: 			"$dnsname as $cluname with $hostip </font>\n");
        !          2868: 	    }
        !          2869: 	} else {
        !          2870: 	    logthis('<font color="green"> existing host'." $host</font>\n");
        !          2871: 	    $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
        !          2872: 	}
        !          2873:     }
1.156     foxr     2874: }
1.140     foxr     2875: 
                   2876: #
                   2877: #  ValidManager: Determines if a given certificate represents a valid manager.
                   2878: #                in this primitive implementation, the 'certificate' is
                   2879: #                just the connecting loncapa client name.  This is checked
                   2880: #                against a valid client list in the configuration.
                   2881: #
                   2882: #                  
                   2883: sub ValidManager {
                   2884:     my $certificate = shift; 
                   2885: 
1.163     foxr     2886:     return isManager;
1.140     foxr     2887: }
                   2888: #
1.143     foxr     2889: #  CopyFile:  Called as part of the process of installing a 
                   2890: #             new configuration file.  This function copies an existing
                   2891: #             file to a backup file.
                   2892: # Parameters:
                   2893: #     oldfile  - Name of the file to backup.
                   2894: #     newfile  - Name of the backup file.
                   2895: # Return:
                   2896: #     0   - Failure (errno has failure reason).
                   2897: #     1   - Success.
                   2898: #
                   2899: sub CopyFile {
                   2900:     my $oldfile = shift;
                   2901:     my $newfile = shift;
                   2902: 
                   2903:     #  The file must exist:
                   2904: 
                   2905:     if(-e $oldfile) {
                   2906: 
1.178.2.4! albertel 2907: 	# Read the old file.
1.143     foxr     2908: 
                   2909: 	my $oldfh = IO::File->new("< $oldfile");
                   2910: 	if(!$oldfh) {
                   2911: 	    return 0;
                   2912: 	}
                   2913: 	my @contents = <$oldfh>;  # Suck in the entire file.
                   2914: 
                   2915: 	# write the backup file:
                   2916: 
                   2917: 	my $newfh = IO::File->new("> $newfile");
                   2918: 	if(!(defined $newfh)){
                   2919: 	    return 0;
                   2920: 	}
                   2921: 	my $lines = scalar @contents;
                   2922: 	for (my $i =0; $i < $lines; $i++) {
                   2923: 	    print $newfh ($contents[$i]);
                   2924: 	}
                   2925: 
                   2926: 	$oldfh->close;
                   2927: 	$newfh->close;
                   2928: 
                   2929: 	chmod(0660, $newfile);
                   2930: 
                   2931: 	return 1;
                   2932: 	    
                   2933:     } else {
                   2934: 	return 0;
                   2935:     }
                   2936: }
1.157     foxr     2937: #
                   2938: #  Host files are passed out with externally visible host IPs.
                   2939: #  If, for example, we are behind a fire-wall or NAT host, our 
                   2940: #  internally visible IP may be different than the externally
                   2941: #  visible IP.  Therefore, we always adjust the contents of the
                   2942: #  host file so that the entry for ME is the IP that we believe
                   2943: #  we have.  At present, this is defined as the entry that
                   2944: #  DNS has for us.  If by some chance we are not able to get a
                   2945: #  DNS translation for us, then we assume that the host.tab file
                   2946: #  is correct.  
                   2947: #    BUGBUGBUG - in the future, we really should see if we can
                   2948: #       easily query the interface(s) instead.
                   2949: # Parameter(s):
                   2950: #     contents    - The contents of the host.tab to check.
                   2951: # Returns:
                   2952: #     newcontents - The adjusted contents.
                   2953: #
                   2954: #
                   2955: sub AdjustHostContents {
                   2956:     my $contents  = shift;
                   2957:     my $adjusted;
                   2958:     my $me        = $perlvar{'lonHostID'};
                   2959: 
1.178.2.4! albertel 2960:     foreach my $line (split(/\n/,$contents)) {
1.157     foxr     2961: 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
                   2962: 	    chomp($line);
                   2963: 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
                   2964: 	    if ($id eq $me) {
1.178.2.4! albertel 2965: 		my $ip = gethostbyname($name);
        !          2966: 		my $ipnew = inet_ntoa($ip);
        !          2967: 		$ip = $ipnew;
1.157     foxr     2968: 		#  Reconstruct the host line and append to adjusted:
                   2969: 		
1.178.2.4! albertel 2970: 		my $newline = "$id:$domain:$role:$name:$ip";
        !          2971: 		if($maxcon ne "") { # Not all hosts have loncnew tuning params
        !          2972: 		    $newline .= ":$maxcon:$idleto:$mincon";
        !          2973: 		}
        !          2974: 		$adjusted .= $newline."\n";
1.157     foxr     2975: 		
1.178.2.4! albertel 2976: 	    } else {		# Not me, pass unmodified.
        !          2977: 		$adjusted .= $line."\n";
        !          2978: 	    }
1.157     foxr     2979: 	} else {                  # Blank or comment never re-written.
                   2980: 	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
                   2981: 	}
1.178.2.4! albertel 2982:     }
        !          2983:     return $adjusted;
1.157     foxr     2984: }
1.143     foxr     2985: #
                   2986: #   InstallFile: Called to install an administrative file:
                   2987: #       - The file is created with <name>.tmp
                   2988: #       - The <name>.tmp file is then mv'd to <name>
                   2989: #   This lugubrious procedure is done to ensure that we are never without
                   2990: #   a valid, even if dated, version of the file regardless of who crashes
                   2991: #   and when the crash occurs.
                   2992: #
                   2993: #  Parameters:
                   2994: #       Name of the file
                   2995: #       File Contents.
                   2996: #  Return:
                   2997: #      nonzero - success.
                   2998: #      0       - failure and $! has an errno.
                   2999: #
                   3000: sub InstallFile {
                   3001:     my $Filename = shift;
                   3002:     my $Contents = shift;
                   3003:     my $TempFile = $Filename.".tmp";
                   3004: 
                   3005:     #  Open the file for write:
1.178.2.4! albertel 3006:     
1.143     foxr     3007:     my $fh = IO::File->new("> $TempFile"); # Write to temp.
                   3008:     if(!(defined $fh)) {
                   3009: 	&logthis('<font color="red"> Unable to create '.$TempFile."</font>");
                   3010: 	return 0;
                   3011:     }
                   3012:     #  write the contents of the file:
1.178.2.4! albertel 3013:     
1.143     foxr     3014:     print $fh ($Contents); 
                   3015:     $fh->close;			# In case we ever have a filesystem w. locking
                   3016: 
                   3017:     chmod(0660, $TempFile);
                   3018: 
                   3019:     # Now we can move install the file in position.
                   3020:     
                   3021:     move($TempFile, $Filename);
                   3022: 
                   3023:     return 1;
                   3024: }
1.169     foxr     3025: #
                   3026: #   ConfigFileFromSelector: converts a configuration file selector
                   3027: #                 (one of host or domain at this point) into a 
                   3028: #                 configuration file pathname.
                   3029: #
                   3030: #  Parameters:
                   3031: #      selector  - Configuration file selector.
                   3032: #  Returns:
                   3033: #      Full path to the file or undef if the selector is invalid.
                   3034: #
                   3035: sub ConfigFileFromSelector {
                   3036:     my $selector   = shift;
                   3037:     my $tablefile;
                   3038: 
                   3039:     my $tabledir = $perlvar{'lonTabDir'}.'/';
                   3040:     if ($selector eq "hosts") {
                   3041: 	$tablefile = $tabledir."hosts.tab";
                   3042:     } elsif ($selector eq "domain") {
                   3043: 	$tablefile = $tabledir."domain.tab";
                   3044:     } else {
                   3045: 	return undef;
                   3046:     }
                   3047:     return $tablefile;
1.143     foxr     3048: 
1.169     foxr     3049: }
1.143     foxr     3050: #
1.141     foxr     3051: #   PushFile:  Called to do an administrative push of a file.
                   3052: #              - Ensure the file being pushed is one we support.
                   3053: #              - Backup the old file to <filename.saved>
                   3054: #              - Separate the contents of the new file out from the
                   3055: #                rest of the request.
                   3056: #              - Write the new file.
                   3057: #  Parameter:
                   3058: #     Request - The entire user request.  This consists of a : separated
                   3059: #               string pushfile:tablename:contents.
                   3060: #     NOTE:  The contents may have :'s in it as well making things a bit
                   3061: #            more interesting... but not much.
                   3062: #  Returns:
                   3063: #     String to send to client ("ok" or "refused" if bad file).
                   3064: #
                   3065: sub PushFile {
                   3066:     my $request = shift;    
                   3067:     my ($command, $filename, $contents) = split(":", $request, 3);
                   3068:     
                   3069:     #  At this point in time, pushes for only the following tables are
                   3070:     #  supported:
                   3071:     #   hosts.tab  ($filename eq host).
                   3072:     #   domain.tab ($filename eq domain).
                   3073:     # Construct the destination filename or reject the request.
                   3074:     #
                   3075:     # lonManage is supposed to ensure this, however this session could be
                   3076:     # part of some elaborate spoof that managed somehow to authenticate.
                   3077:     #
                   3078: 
1.169     foxr     3079: 
                   3080:     my $tablefile = ConfigFileFromSelector($filename);
                   3081:     if(! (defined $tablefile)) {
1.141     foxr     3082: 	return "refused";
                   3083:     }
                   3084:     #
                   3085:     # >copy< the old table to the backup table
                   3086:     #        don't rename in case system crashes/reboots etc. in the time
                   3087:     #        window between a rename and write.
                   3088:     #
                   3089:     my $backupfile = $tablefile;
                   3090:     $backupfile    =~ s/\.tab$/.old/;
1.143     foxr     3091:     if(!CopyFile($tablefile, $backupfile)) {
                   3092: 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
                   3093: 	return "error:$!";
                   3094:     }
1.141     foxr     3095:     &logthis('<font color="green"> Pushfile: backed up '
1.178.2.4! albertel 3096: 	     .$tablefile." to $backupfile</font>");
1.141     foxr     3097:     
1.157     foxr     3098:     #  If the file being pushed is the host file, we adjust the entry for ourself so that the
                   3099:     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
                   3100:     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
                   3101:     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
                   3102:     #  that possibilty.
                   3103: 
                   3104:     if($filename eq "host") {
                   3105: 	$contents = AdjustHostContents($contents);
                   3106:     }
                   3107: 
1.141     foxr     3108:     #  Install the new file:
                   3109: 
1.143     foxr     3110:     if(!InstallFile($tablefile, $contents)) {
                   3111: 	&logthis('<font color="red"> Pushfile: unable to install '
1.178.2.4! albertel 3112: 		 .$tablefile." $! </font>");
1.143     foxr     3113: 	return "error:$!";
1.178.2.4! albertel 3114:     } else {
1.143     foxr     3115: 	&logthis('<font color="green"> Installed new '.$tablefile
                   3116: 		 ."</font>");
1.178.2.4! albertel 3117: 	
1.143     foxr     3118:     }
                   3119: 
1.141     foxr     3120: 
                   3121:     #  Indicate success:
                   3122:  
                   3123:     return "ok";
                   3124: 
                   3125: }
1.145     foxr     3126: 
                   3127: #
                   3128: #  Called to re-init either lonc or lond.
                   3129: #
                   3130: #  Parameters:
                   3131: #    request   - The full request by the client.  This is of the form
                   3132: #                reinit:<process>  
                   3133: #                where <process> is allowed to be either of 
                   3134: #                lonc or lond
                   3135: #
                   3136: #  Returns:
                   3137: #     The string to be sent back to the client either:
                   3138: #   ok         - Everything worked just fine.
                   3139: #   error:why  - There was a failure and why describes the reason.
                   3140: #
                   3141: #
                   3142: sub ReinitProcess {
                   3143:     my $request = shift;
                   3144: 
1.146     foxr     3145: 
                   3146:     # separate the request (reinit) from the process identifier and
                   3147:     # validate it producing the name of the .pid file for the process.
                   3148:     #
                   3149:     #
                   3150:     my ($junk, $process) = split(":", $request);
1.147     foxr     3151:     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146     foxr     3152:     if($process eq 'lonc') {
                   3153: 	$processpidfile = $processpidfile."lonc.pid";
1.147     foxr     3154: 	if (!open(PIDFILE, "< $processpidfile")) {
                   3155: 	    return "error:Open failed for $processpidfile";
                   3156: 	}
                   3157: 	my $loncpid = <PIDFILE>;
                   3158: 	close(PIDFILE);
                   3159: 	logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
                   3160: 		."</font>");
                   3161: 	kill("USR2", $loncpid);
1.146     foxr     3162:     } elsif ($process eq 'lond') {
1.147     foxr     3163: 	logthis('<font color="red"> Reinitializing self (lond) </font>');
                   3164: 	&UpdateHosts;			# Lond is us!!
1.146     foxr     3165:     } else {
                   3166: 	&logthis('<font color="yellow" Invalid reinit request for '.$process
                   3167: 		 ."</font>");
                   3168: 	return "error:Invalid process identifier $process";
                   3169:     }
1.145     foxr     3170:     return 'ok';
                   3171: }
1.168     foxr     3172: #   Validate a line in a configuration file edit script:
                   3173: #   Validation includes:
                   3174: #     - Ensuring the command is valid.
                   3175: #     - Ensuring the command has sufficient parameters
                   3176: #   Parameters:
                   3177: #     scriptline - A line to validate (\n has been stripped for what it's worth).
1.167     foxr     3178: #
1.168     foxr     3179: #   Return:
                   3180: #      0     - Invalid scriptline.
                   3181: #      1     - Valid scriptline
                   3182: #  NOTE:
                   3183: #     Only the command syntax is checked, not the executability of the
                   3184: #     command.
                   3185: #
                   3186: sub isValidEditCommand {
                   3187:     my $scriptline = shift;
                   3188: 
                   3189:     #   Line elements are pipe separated:
                   3190: 
                   3191:     my ($command, $key, $newline)  = split(/\|/, $scriptline);
                   3192:     &logthis('<font color="green"> isValideditCommand checking: '.
                   3193: 	     "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
                   3194:     
                   3195:     if ($command eq "delete") {
                   3196: 	#
                   3197: 	#   key with no newline.
                   3198: 	#
                   3199: 	if( ($key eq "") || ($newline ne "")) {
                   3200: 	    return 0;		# Must have key but no newline.
                   3201: 	} else {
                   3202: 	    return 1;		# Valid syntax.
                   3203: 	}
1.169     foxr     3204:     } elsif ($command eq "replace") {
1.168     foxr     3205: 	#
                   3206: 	#   key and newline:
                   3207: 	#
                   3208: 	if (($key eq "") || ($newline eq "")) {
                   3209: 	    return 0;
                   3210: 	} else {
                   3211: 	    return 1;
                   3212: 	}
1.169     foxr     3213:     } elsif ($command eq "append") {
                   3214: 	if (($key ne "") && ($newline eq "")) {
                   3215: 	    return 1;
                   3216: 	} else {
                   3217: 	    return 0;
                   3218: 	}
1.168     foxr     3219:     } else {
                   3220: 	return 0;		# Invalid command.
                   3221:     }
                   3222:     return 0;			# Should not get here!!!
                   3223: }
1.169     foxr     3224: #
                   3225: #   ApplyEdit - Applies an edit command to a line in a configuration 
                   3226: #               file.  It is the caller's responsiblity to validate the
                   3227: #               edit line.
                   3228: #   Parameters:
                   3229: #      $directive - A single edit directive to apply.  
                   3230: #                   Edit directives are of the form:
                   3231: #                  append|newline      - Appends a new line to the file.
                   3232: #                  replace|key|newline - Replaces the line with key value 'key'
                   3233: #                  delete|key          - Deletes the line with key value 'key'.
                   3234: #      $editor   - A config file editor object that contains the
                   3235: #                  file being edited.
                   3236: #
                   3237: sub ApplyEdit {
                   3238:     my $directive   = shift;
                   3239:     my $editor      = shift;
                   3240: 
                   3241:     # Break the directive down into its command and its parameters
                   3242:     # (at most two at this point.  The meaning of the parameters, if in fact
                   3243:     #  they exist depends on the command).
                   3244: 
                   3245:     my ($command, $p1, $p2) = split(/\|/, $directive);
                   3246: 
                   3247:     if($command eq "append") {
                   3248: 	$editor->Append($p1);	          # p1 - key p2 null.
                   3249:     } elsif ($command eq "replace") {
                   3250: 	$editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.
                   3251:     } elsif ($command eq "delete") {
                   3252: 	$editor->DeleteLine($p1);         # p1 - key p2 null.
                   3253:     } else {			          # Should not get here!!!
1.178.2.4! albertel 3254: 	die "Invalid command given to ApplyEdit $command";
1.169     foxr     3255:     }
                   3256: }
                   3257: #
                   3258: # AdjustOurHost:
                   3259: #           Adjusts a host file stored in a configuration file editor object
                   3260: #           for the true IP address of this host. This is necessary for hosts
                   3261: #           that live behind a firewall.
                   3262: #           Those hosts have a publicly distributed IP of the firewall, but
                   3263: #           internally must use their actual IP.  We assume that a given
                   3264: #           host only has a single IP interface for now.
                   3265: # Formal Parameters:
                   3266: #     editor   - The configuration file editor to adjust.  This
                   3267: #                editor is assumed to contain a hosts.tab file.
                   3268: # Strategy:
                   3269: #    - Figure out our hostname.
                   3270: #    - Lookup the entry for this host.
                   3271: #    - Modify the line to contain our IP
                   3272: #    - Do a replace for this host.
                   3273: sub AdjustOurHost {
                   3274:     my $editor        = shift;
                   3275: 
                   3276:     # figure out who I am.
                   3277: 
                   3278:     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.
                   3279: 
                   3280:     #  Get my host file entry.
                   3281: 
                   3282:     my $ConfigLine    = $editor->Find($myHostName);
                   3283:     if(! (defined $ConfigLine)) {
                   3284: 	die "AdjustOurHost - no entry for me in hosts file $myHostName";
                   3285:     }
                   3286:     # figure out my IP:
                   3287:     #   Use the config line to get my hostname.
                   3288:     #   Use gethostbyname to translate that into an IP address.
                   3289:     #
                   3290:     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
                   3291:     my $BinaryIp = gethostbyname($name);
                   3292:     my $ip       = inet_ntoa($ip);
                   3293:     #
                   3294:     #  Reassemble the config line from the elements in the list.
                   3295:     #  Note that if the loncnew items were not present before, they will
                   3296:     #  be now even if they would be empty
                   3297:     #
                   3298:     my $newConfigLine = $id;
                   3299:     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
                   3300: 	$newConfigLine .= ":".$item;
                   3301:     }
                   3302:     #  Replace the line:
                   3303: 
                   3304:     $editor->ReplaceLine($id, $newConfigLine);
                   3305:     
                   3306: }
                   3307: #
                   3308: #   ReplaceConfigFile:
                   3309: #              Replaces a configuration file with the contents of a
                   3310: #              configuration file editor object.
                   3311: #              This is done by:
                   3312: #              - Copying the target file to <filename>.old
                   3313: #              - Writing the new file to <filename>.tmp
                   3314: #              - Moving <filename.tmp>  -> <filename>
                   3315: #              This laborious process ensures that the system is never without
                   3316: #              a configuration file that's at least valid (even if the contents
                   3317: #              may be dated).
                   3318: #   Parameters:
                   3319: #        filename   - Name of the file to modify... this is a full path.
                   3320: #        editor     - Editor containing the file.
                   3321: #
                   3322: sub ReplaceConfigFile {
                   3323:     my $filename  = shift;
                   3324:     my $editor    = shift;
1.168     foxr     3325: 
1.169     foxr     3326:     CopyFile ($filename, $filename.".old");
                   3327: 
                   3328:     my $contents  = $editor->Get(); # Get the contents of the file.
                   3329: 
                   3330:     InstallFile($filename, $contents);
                   3331: }
1.168     foxr     3332: #   
                   3333: #
                   3334: #   Called to edit a configuration table  file
1.167     foxr     3335: #   Parameters:
                   3336: #      request           - The entire command/request sent by lonc or lonManage
                   3337: #   Return:
                   3338: #      The reply to send to the client.
1.168     foxr     3339: #
1.167     foxr     3340: sub EditFile {
                   3341:     my $request = shift;
                   3342: 
                   3343:     #  Split the command into it's pieces:  edit:filetype:script
                   3344: 
1.168     foxr     3345:     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
1.167     foxr     3346: 
                   3347:     #  Check the pre-coditions for success:
                   3348: 
                   3349:     if($request != "edit") {	# Something is amiss afoot alack.
                   3350: 	return "error:edit request detected, but request != 'edit'\n";
                   3351:     }
                   3352:     if( ($filetype ne "hosts")  &&
                   3353: 	($filetype ne "domain")) {
                   3354: 	return "error:edit requested with invalid file specifier: $filetype \n";
                   3355:     }
                   3356: 
                   3357:     #   Split the edit script and check it's validity.
1.168     foxr     3358: 
                   3359:     my @scriptlines = split(/\n/, $script);  # one line per element.
                   3360:     my $linecount   = scalar(@scriptlines);
                   3361:     for(my $i = 0; $i < $linecount; $i++) {
                   3362: 	chomp($scriptlines[$i]);
                   3363: 	if(!isValidEditCommand($scriptlines[$i])) {
                   3364: 	    return "error:edit with bad script line: '$scriptlines[$i]' \n";
                   3365: 	}
                   3366:     }
1.145     foxr     3367: 
1.167     foxr     3368:     #   Execute the edit operation.
1.169     foxr     3369:     #   - Create a config file editor for the appropriate file and 
                   3370:     #   - execute each command in the script:
                   3371:     #
                   3372:     my $configfile = ConfigFileFromSelector($filetype);
                   3373:     if (!(defined $configfile)) {
                   3374: 	return "refused\n";
                   3375:     }
                   3376:     my $editor = ConfigFileEdit->new($configfile);
1.167     foxr     3377: 
1.169     foxr     3378:     for (my $i = 0; $i < $linecount; $i++) {
                   3379: 	ApplyEdit($scriptlines[$i], $editor);
                   3380:     }
                   3381:     # If the file is the host file, ensure that our host is
                   3382:     # adjusted to have our ip:
                   3383:     #
                   3384:     if($filetype eq "host") {
                   3385: 	AdjustOurHost($editor);
                   3386:     }
                   3387:     #  Finally replace the current file with our file.
                   3388:     #
                   3389:     ReplaceConfigFile($configfile, $editor);
1.167     foxr     3390: 
                   3391:     return "ok\n";
                   3392: }
1.141     foxr     3393: #
1.96      foxr     3394: #  Convert an error return code from lcpasswd to a string value.
                   3395: #
                   3396: sub lcpasswdstrerror {
                   3397:     my $ErrorCode = shift;
1.97      foxr     3398:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96      foxr     3399: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
                   3400:     } else {
1.98      foxr     3401: 	return $passwderrors[$ErrorCode];
1.96      foxr     3402:     }
                   3403: }
                   3404: 
1.97      foxr     3405: #
                   3406: # Convert an error return code from lcuseradd to a string value:
                   3407: #
                   3408: sub lcuseraddstrerror {
                   3409:     my $ErrorCode = shift;
                   3410:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
                   3411: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
                   3412:     } else {
1.98      foxr     3413: 	return $adderrors[$ErrorCode];
1.97      foxr     3414:     }
                   3415: }
                   3416: 
1.23      harris41 3417: # grabs exception and records it to log before exiting
                   3418: sub catchexception {
1.27      albertel 3419:     my ($error)=@_;
1.25      www      3420:     $SIG{'QUIT'}='DEFAULT';
                   3421:     $SIG{__DIE__}='DEFAULT';
1.165     albertel 3422:     &status("Catching exception");
1.23      harris41 3423:     &logthis("<font color=red>CRITICAL: "
1.178.2.4! albertel 3424: 	     ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
        !          3425: 	     ."a crash with this error msg->[$error]</font>");
1.57      www      3426:     &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27      albertel 3427:     if ($client) { print $client "error: $error\n"; }
1.59      www      3428:     $server->close();
1.27      albertel 3429:     die($error);
1.23      harris41 3430: }
                   3431: 
1.63      www      3432: sub timeout {
1.165     albertel 3433:     &status("Handling Timeout");
1.63      www      3434:     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
                   3435:     &catchexception('Timeout');
                   3436: }
1.22      harris41 3437: # -------------------------------- Set signal handlers to record abnormal exits
                   3438: 
                   3439: $SIG{'QUIT'}=\&catchexception;
                   3440: $SIG{__DIE__}=\&catchexception;
                   3441: 
1.81      matthew  3442: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95      harris41 3443: &status("Read loncapa.conf and loncapa_apache.conf");
                   3444: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141     foxr     3445: %perlvar=%{$perlvarref};
1.80      harris41 3446: undef $perlvarref;
1.19      www      3447: 
1.35      harris41 3448: # ----------------------------- Make sure this process is running from user=www
                   3449: my $wwwid=getpwnam('www');
                   3450: if ($wwwid!=$<) {
1.178.2.4! albertel 3451:     my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
        !          3452:     my $subj="LON: $currenthostid User ID mismatch";
        !          3453:     system("echo 'User ID mismatch.  lond must be run as user www.' |\
1.35      harris41 3454:  mailto $emailto -s '$subj' > /dev/null");
1.178.2.4! albertel 3455:     exit 1;
1.35      harris41 3456: }
                   3457: 
1.19      www      3458: # --------------------------------------------- Check if other instance running
                   3459: 
                   3460: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
                   3461: 
                   3462: if (-e $pidfile) {
1.178.2.4! albertel 3463:     my $lfh=IO::File->new("$pidfile");
        !          3464:     my $pide=<$lfh>;
        !          3465:     chomp($pide);
        !          3466:     if (kill 0 => $pide) { die "already running"; }
1.19      www      3467: }
1.1       albertel 3468: 
                   3469: # ------------------------------------------------------------- Read hosts file
                   3470: 
                   3471: 
                   3472: 
                   3473: # establish SERVER socket, bind and listen.
                   3474: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                   3475:                                 Type      => SOCK_STREAM,
                   3476:                                 Proto     => 'tcp',
                   3477:                                 Reuse     => 1,
                   3478:                                 Listen    => 10 )
1.178.2.4! albertel 3479:     or die "making socket: $@\n";
1.1       albertel 3480: 
                   3481: # --------------------------------------------------------- Do global variables
                   3482: 
                   3483: # global variables
                   3484: 
1.134     albertel 3485: my %children               = ();       # keys are current child process IDs
1.178.2.1  foxr     3486: my $children               = 0;        # current number of children
1.1       albertel 3487: 
                   3488: sub REAPER {                        # takes care of dead children
                   3489:     $SIG{CHLD} = \&REAPER;
1.165     albertel 3490:     &status("Handling child death");
1.178.2.1  foxr     3491:     my $pid = wait;
                   3492:     if (defined($children{$pid})) {
                   3493: 	&logthis("Child $pid died");
                   3494: 	$children --;
                   3495: 	delete $children{$pid};
                   3496:     } else {
                   3497: 	&logthis("Unknown Child $pid died");
1.176     albertel 3498:     }
1.165     albertel 3499:     &status("Finished Handling child death");
1.1       albertel 3500: }
                   3501: 
                   3502: sub HUNTSMAN {                      # signal handler for SIGINT
1.165     albertel 3503:     &status("Killing children (INT)");
1.1       albertel 3504:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                   3505:     kill 'INT' => keys %children;
1.59      www      3506:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1       albertel 3507:     my $execdir=$perlvar{'lonDaemons'};
                   3508:     unlink("$execdir/logs/lond.pid");
1.9       www      3509:     &logthis("<font color=red>CRITICAL: Shutting down</font>");
1.165     albertel 3510:     &status("Done killing children");
1.1       albertel 3511:     exit;                           # clean up with dignity
                   3512: }
                   3513: 
                   3514: sub HUPSMAN {                      # signal handler for SIGHUP
                   3515:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
1.165     albertel 3516:     &status("Killing children for restart (HUP)");
1.1       albertel 3517:     kill 'INT' => keys %children;
1.59      www      3518:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.9       www      3519:     &logthis("<font color=red>CRITICAL: Restarting</font>");
1.134     albertel 3520:     my $execdir=$perlvar{'lonDaemons'};
1.30      harris41 3521:     unlink("$execdir/logs/lond.pid");
1.165     albertel 3522:     &status("Restarting self (HUP)");
1.1       albertel 3523:     exec("$execdir/lond");         # here we go again
                   3524: }
                   3525: 
1.144     foxr     3526: #
1.148     foxr     3527: #    Kill off hashes that describe the host table prior to re-reading it.
                   3528: #    Hashes affected are:
                   3529: #       %hostid, %hostdom %hostip
                   3530: #
                   3531: sub KillHostHashes {
                   3532:     foreach my $key (keys %hostid) {
                   3533: 	delete $hostid{$key};
                   3534:     }
                   3535:     foreach my $key (keys %hostdom) {
                   3536: 	delete $hostdom{$key};
                   3537:     }
                   3538:     foreach my $key (keys %hostip) {
                   3539: 	delete $hostip{$key};
                   3540:     }
                   3541: }
                   3542: #
                   3543: #   Read in the host table from file and distribute it into the various hashes:
                   3544: #
                   3545: #    - %hostid  -  Indexed by IP, the loncapa hostname.
                   3546: #    - %hostdom -  Indexed by  loncapa hostname, the domain.
                   3547: #    - %hostip  -  Indexed by hostid, the Ip address of the host.
                   3548: sub ReadHostTable {
                   3549: 
                   3550:     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
                   3551:     
                   3552:     while (my $configline=<CONFIG>) {
1.178.2.1  foxr     3553: 	my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
                   3554: 	chomp($ip); $ip=~s/\D+$//;
                   3555: 	$hostid{$ip}=$id;
                   3556: 	$hostdom{$id}=$domain;
                   3557: 	$hostip{$id}=$ip;
                   3558: 	if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
1.148     foxr     3559:     }
                   3560:     close(CONFIG);
                   3561: }
                   3562: #
                   3563: #  Reload the Apache daemon's state.
1.150     foxr     3564: #  This is done by invoking /home/httpd/perl/apachereload
                   3565: #  a setuid perl script that can be root for us to do this job.
1.148     foxr     3566: #
                   3567: sub ReloadApache {
1.150     foxr     3568:     my $execdir = $perlvar{'lonDaemons'};
                   3569:     my $script  = $execdir."/apachereload";
                   3570:     system($script);
1.148     foxr     3571: }
                   3572: 
                   3573: #
1.144     foxr     3574: #   Called in response to a USR2 signal.
                   3575: #   - Reread hosts.tab
                   3576: #   - All children connected to hosts that were removed from hosts.tab
                   3577: #     are killed via SIGINT
                   3578: #   - All children connected to previously existing hosts are sent SIGUSR1
                   3579: #   - Our internal hosts hash is updated to reflect the new contents of
                   3580: #     hosts.tab causing connections from hosts added to hosts.tab to
                   3581: #     now be honored.
                   3582: #
                   3583: sub UpdateHosts {
1.165     albertel 3584:     &status("Reload hosts.tab");
1.147     foxr     3585:     logthis('<font color="blue"> Updating connections </font>');
1.148     foxr     3586:     #
                   3587:     #  The %children hash has the set of IP's we currently have children
                   3588:     #  on.  These need to be matched against records in the hosts.tab
                   3589:     #  Any ip's no longer in the table get killed off they correspond to
                   3590:     #  either dropped or changed hosts.  Note that the re-read of the table
                   3591:     #  will take care of new and changed hosts as connections come into being.
                   3592: 
                   3593: 
                   3594:     KillHostHashes;
                   3595:     ReadHostTable;
                   3596: 
                   3597:     foreach my $child (keys %children) {
                   3598: 	my $childip = $children{$child};
                   3599: 	if(!$hostid{$childip}) {
1.149     foxr     3600: 	    logthis('<font color="blue"> UpdateHosts killing child '
                   3601: 		    ." $child for ip $childip </font>");
1.148     foxr     3602: 	    kill('INT', $child);
1.149     foxr     3603: 	} else {
                   3604: 	    logthis('<font color="green"> keeping child for ip '
                   3605: 		    ." $childip (pid=$child) </font>");
1.148     foxr     3606: 	}
                   3607:     }
                   3608:     ReloadApache;
1.165     albertel 3609:     &status("Finished reloading hosts.tab");
1.144     foxr     3610: }
                   3611: 
1.148     foxr     3612: 
1.57      www      3613: sub checkchildren {
1.165     albertel 3614:     &status("Checking on the children (sending signals)");
1.57      www      3615:     &initnewstatus();
                   3616:     &logstatus();
                   3617:     &logthis('Going to check on the children');
1.134     albertel 3618:     my $docdir=$perlvar{'lonDocRoot'};
1.61      harris41 3619:     foreach (sort keys %children) {
1.57      www      3620: 	sleep 1;
                   3621:         unless (kill 'USR1' => $_) {
                   3622: 	    &logthis ('Child '.$_.' is dead');
                   3623:             &logstatus($$.' is dead');
                   3624:         } 
1.61      harris41 3625:     }
1.63      www      3626:     sleep 5;
1.113     albertel 3627:     $SIG{ALRM} = sub { die "timeout" };
                   3628:     $SIG{__DIE__} = 'DEFAULT';
1.165     albertel 3629:     &status("Checking on the children (waiting for reports)");
1.63      www      3630:     foreach (sort keys %children) {
                   3631:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.178.2.4! albertel 3632: 	    eval {
        !          3633: 		alarm(300);
        !          3634: 		&logthis('Child '.$_.' did not respond');
        !          3635: 		kill 9 => $_;
        !          3636: 		#$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
        !          3637: 		#$subj="LON: $currenthostid killed lond process $_";
        !          3638: 		#my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
        !          3639: 		#$execdir=$perlvar{'lonDaemons'};
        !          3640: 		#$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
        !          3641: 		alarm(0);
        !          3642: 	    }
1.63      www      3643:         }
                   3644:     }
1.113     albertel 3645:     $SIG{ALRM} = 'DEFAULT';
1.155     albertel 3646:     $SIG{__DIE__} = \&catchexception;
1.165     albertel 3647:     &status("Finished checking children");
1.57      www      3648: }
                   3649: 
1.1       albertel 3650: # --------------------------------------------------------------------- Logging
                   3651: 
                   3652: sub logthis {
                   3653:     my $message=shift;
                   3654:     my $execdir=$perlvar{'lonDaemons'};
                   3655:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
                   3656:     my $now=time;
                   3657:     my $local=localtime($now);
1.58      www      3658:     $lastlog=$local.': '.$message;
1.1       albertel 3659:     print $fh "$local ($$): $message\n";
                   3660: }
                   3661: 
1.77      foxr     3662: # ------------------------- Conditional log if $DEBUG true.
                   3663: sub Debug {
                   3664:     my $message = shift;
                   3665:     if($DEBUG) {
                   3666: 	&logthis($message);
                   3667:     }
                   3668: }
1.161     foxr     3669: 
                   3670: #
                   3671: #   Sub to do replies to client.. this gives a hook for some
                   3672: #   debug tracing too:
                   3673: #  Parameters:
                   3674: #     fd      - File open on client.
                   3675: #     reply   - Text to send to client.
                   3676: #     request - Original request from client.
                   3677: #
1.178.2.1  foxr     3678: #  Note: This increments Transactions
                   3679: #
1.161     foxr     3680: sub Reply {
1.178.2.1  foxr     3681:     alarm(120);
1.161     foxr     3682:     my $fd      = shift;
                   3683:     my $reply   = shift;
                   3684:     my $request = shift;
                   3685: 
                   3686:     print $fd $reply;
                   3687:     Debug("Request was $request  Reply was $reply");
                   3688: 
1.178.2.1  foxr     3689:     $Transactions++;
                   3690:     alarm(0);
                   3691: 
                   3692: 
                   3693: }
                   3694: #
                   3695: #    Sub to report a failure.
                   3696: #    This function:
                   3697: #     -   Increments the failure statistic counters.
                   3698: #     -   Invokes Reply to send the error message to the client.
                   3699: # Parameters:
                   3700: #    fd       - File descriptor open on the client
                   3701: #    reply    - Reply text to emit.
                   3702: #    request  - The original request message (used by Reply
                   3703: #               to debug if that's enabled.
                   3704: # Implicit outputs:
                   3705: #    $Failures- The number of failures is incremented.
                   3706: #    Reply (invoked here) sends a message to the 
                   3707: #    client:
                   3708: #
                   3709: sub Failure {
1.178.2.4! albertel 3710:     my $fd      = shift;
        !          3711:     my $reply   = shift;
        !          3712:     my $request = shift;
1.178.2.1  foxr     3713:    
1.178.2.4! albertel 3714:     $Failures++;
        !          3715:     Reply($fd, $reply, $request);      # That's simple eh?
1.161     foxr     3716: }
1.57      www      3717: # ------------------------------------------------------------------ Log status
                   3718: 
                   3719: sub logstatus {
1.178.2.4! albertel 3720:     &status("Doing logging");
        !          3721:     my $docdir=$perlvar{'lonDocRoot'};
        !          3722:     {
        !          3723: 	my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
        !          3724: 	print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";
        !          3725: 	$fh->close();
        !          3726:     }
        !          3727:     &status("Finished londstatus.txt");
        !          3728:     {
        !          3729: 	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
        !          3730: 	print $fh $status."\n".$lastlog."\n".time;
        !          3731: 	$fh->close();
        !          3732:     }
        !          3733:     ResetStatistics;
        !          3734:     &status("Finished logging");
1.178.2.1  foxr     3735:    
1.57      www      3736: }
                   3737: 
                   3738: sub initnewstatus {
                   3739:     my $docdir=$perlvar{'lonDocRoot'};
                   3740:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
                   3741:     my $now=time;
                   3742:     my $local=localtime($now);
                   3743:     print $fh "LOND status $local - parent $$\n\n";
1.64      www      3744:     opendir(DIR,"$docdir/lon-status/londchld");
1.134     albertel 3745:     while (my $filename=readdir(DIR)) {
1.64      www      3746:         unlink("$docdir/lon-status/londchld/$filename");
                   3747:     }
                   3748:     closedir(DIR);
1.57      www      3749: }
                   3750: 
                   3751: # -------------------------------------------------------------- Status setting
                   3752: 
                   3753: sub status {
                   3754:     my $what=shift;
                   3755:     my $now=time;
                   3756:     my $local=localtime($now);
1.178.2.1  foxr     3757:     my $status = "lond: $what $local ";
                   3758:     if($Transactions) {
1.178.2.4! albertel 3759: 	$status .= " Transactions: $Transactions Failed; $Failures";
1.178.2.1  foxr     3760:     }
                   3761:     $0=$status;
1.57      www      3762: }
1.11      www      3763: 
                   3764: # -------------------------------------------------------- Escape Special Chars
                   3765: 
                   3766: sub escape {
                   3767:     my $str=shift;
                   3768:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
                   3769:     return $str;
                   3770: }
                   3771: 
                   3772: # ----------------------------------------------------- Un-Escape Special Chars
                   3773: 
                   3774: sub unescape {
                   3775:     my $str=shift;
                   3776:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                   3777:     return $str;
                   3778: }
                   3779: 
1.1       albertel 3780: # ----------------------------------------------------------- Send USR1 to lonc
                   3781: 
                   3782: sub reconlonc {
                   3783:     my $peerfile=shift;
                   3784:     &logthis("Trying to reconnect for $peerfile");
                   3785:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
                   3786:     if (my $fh=IO::File->new("$loncfile")) {
                   3787: 	my $loncpid=<$fh>;
                   3788:         chomp($loncpid);
                   3789:         if (kill 0 => $loncpid) {
                   3790: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
                   3791:             kill USR1 => $loncpid;
                   3792:         } else {
1.178.2.4! albertel 3793: 	    &logthis("<font color=red>CRITICAL: "
        !          3794: 		     ."lonc at pid $loncpid not responding, giving up</font>");
1.1       albertel 3795:         }
                   3796:     } else {
1.178.2.4! albertel 3797: 	&logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
1.1       albertel 3798:     }
                   3799: }
                   3800: 
                   3801: # -------------------------------------------------- Non-critical communication
1.11      www      3802: 
1.1       albertel 3803: sub subreply {
                   3804:     my ($cmd,$server)=@_;
                   3805:     my $peerfile="$perlvar{'lonSockDir'}/$server";
                   3806:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   3807:                                       Type    => SOCK_STREAM,
                   3808:                                       Timeout => 10)
1.178.2.4! albertel 3809: 	or return "con_lost";
1.1       albertel 3810:     print $sclient "$cmd\n";
                   3811:     my $answer=<$sclient>;
                   3812:     chomp($answer);
                   3813:     if (!$answer) { $answer="con_lost"; }
                   3814:     return $answer;
                   3815: }
                   3816: 
                   3817: sub reply {
1.178.2.4! albertel 3818:     my ($cmd,$server)=@_;
        !          3819:     my $answer;
        !          3820:     if ($server ne $currenthostid) { 
        !          3821: 	$answer=subreply($cmd,$server);
        !          3822: 	if ($answer eq 'con_lost') {
        !          3823: 	    $answer=subreply("ping",$server);
        !          3824: 	    if ($answer ne $server) {
        !          3825: 		&logthis("sub reply: answer != server answer is $answer, server is $server");
        !          3826: 		&reconlonc("$perlvar{'lonSockDir'}/$server");
        !          3827: 	    }
        !          3828: 	    $answer=subreply($cmd,$server);
        !          3829: 	}
        !          3830:     } else {
        !          3831: 	$answer='self_reply';
        !          3832:     } 
        !          3833:     return $answer;
1.1       albertel 3834: }
                   3835: 
1.13      www      3836: # -------------------------------------------------------------- Talk to lonsql
                   3837: 
1.12      harris41 3838: sub sqlreply {
                   3839:     my ($cmd)=@_;
                   3840:     my $answer=subsqlreply($cmd);
                   3841:     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
                   3842:     return $answer;
                   3843: }
                   3844: 
                   3845: sub subsqlreply {
                   3846:     my ($cmd)=@_;
                   3847:     my $unixsock="mysqlsock";
                   3848:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
                   3849:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   3850:                                       Type    => SOCK_STREAM,
                   3851:                                       Timeout => 10)
1.178.2.4! albertel 3852: 	or return "con_lost";
1.12      harris41 3853:     print $sclient "$cmd\n";
                   3854:     my $answer=<$sclient>;
                   3855:     chomp($answer);
                   3856:     if (!$answer) { $answer="con_lost"; }
                   3857:     return $answer;
                   3858: }
                   3859: 
1.1       albertel 3860: # -------------------------------------------- Return path to profile directory
1.11      www      3861: 
1.1       albertel 3862: sub propath {
                   3863:     my ($udom,$uname)=@_;
                   3864:     $udom=~s/\W//g;
                   3865:     $uname=~s/\W//g;
1.16      www      3866:     my $subdir=$uname.'__';
1.1       albertel 3867:     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
                   3868:     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
                   3869:     return $proname;
                   3870: } 
                   3871: 
                   3872: # --------------------------------------- Is this the home server of an author?
1.11      www      3873: 
1.1       albertel 3874: sub ishome {
                   3875:     my $author=shift;
                   3876:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                   3877:     my ($udom,$uname)=split(/\//,$author);
                   3878:     my $proname=propath($udom,$uname);
                   3879:     if (-e $proname) {
                   3880: 	return 'owner';
                   3881:     } else {
                   3882:         return 'not_owner';
                   3883:     }
                   3884: }
                   3885: 
                   3886: # ======================================================= Continue main program
                   3887: # ---------------------------------------------------- Fork once and dissociate
                   3888: 
1.134     albertel 3889: my $fpid=fork;
1.1       albertel 3890: exit if $fpid;
1.29      harris41 3891: die "Couldn't fork: $!" unless defined ($fpid);
1.1       albertel 3892: 
1.29      harris41 3893: POSIX::setsid() or die "Can't start new session: $!";
1.1       albertel 3894: 
                   3895: # ------------------------------------------------------- Write our PID on disk
                   3896: 
1.134     albertel 3897: my $execdir=$perlvar{'lonDaemons'};
1.1       albertel 3898: open (PIDSAVE,">$execdir/logs/lond.pid");
                   3899: print PIDSAVE "$$\n";
                   3900: close(PIDSAVE);
1.9       www      3901: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
1.57      www      3902: &status('Starting');
1.1       albertel 3903: 
1.106     foxr     3904: 
1.1       albertel 3905: 
                   3906: # ----------------------------------------------------- Install signal handlers
                   3907: 
1.57      www      3908: 
1.1       albertel 3909: $SIG{CHLD} = \&REAPER;
                   3910: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   3911: $SIG{HUP}  = \&HUPSMAN;
1.57      www      3912: $SIG{USR1} = \&checkchildren;
1.144     foxr     3913: $SIG{USR2} = \&UpdateHosts;
1.106     foxr     3914: 
1.148     foxr     3915: #  Read the host hashes:
                   3916: 
                   3917: ReadHostTable;
1.106     foxr     3918: 
1.178.2.1  foxr     3919: 
1.106     foxr     3920: # --------------------------------------------------------------
                   3921: #   Accept connections.  When a connection comes in, it is validated
                   3922: #   and if good, a child process is created to process transactions
                   3923: #   along the connection.
                   3924: 
1.1       albertel 3925: while (1) {
1.165     albertel 3926:     &status('Starting accept');
1.106     foxr     3927:     $client = $server->accept() or next;
1.165     albertel 3928:     &status('Accepted '.$client.' off to spawn');
1.106     foxr     3929:     make_new_child($client);
1.165     albertel 3930:     &status('Finished spawning');
1.1       albertel 3931: }
                   3932: 
                   3933: sub make_new_child {
                   3934:     my $pid;
                   3935:     my $sigset;
1.106     foxr     3936: 
                   3937:     $client = shift;
1.165     albertel 3938:     &status('Starting new child '.$client);
1.161     foxr     3939:     &logthis('<font color="green"> Attempting to start child ('.$client.
                   3940: 	     ")</font>");    
1.1       albertel 3941:     # block signal for fork
                   3942:     $sigset = POSIX::SigSet->new(SIGINT);
                   3943:     sigprocmask(SIG_BLOCK, $sigset)
1.29      harris41 3944:         or die "Can't block SIGINT for fork: $!\n";
1.178.2.4! albertel 3945:     
1.29      harris41 3946:     die "fork: $!" unless defined ($pid = fork);
1.148     foxr     3947: 
                   3948:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                   3949: 	                               # connection liveness.
                   3950: 
                   3951:     #
                   3952:     #  Figure out who we're talking to so we can record the peer in 
                   3953:     #  the pid hash.
                   3954:     #
                   3955:     my $caller = getpeername($client);
                   3956:     my ($port,$iaddr)=unpack_sockaddr_in($caller);
                   3957:     $clientip=inet_ntoa($iaddr);
1.1       albertel 3958:     
                   3959:     if ($pid) {
                   3960:         # Parent records the child's birth and returns.
                   3961:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 3962:             or die "Can't unblock SIGINT for fork: $!\n";
1.148     foxr     3963:         $children{$pid} = $clientip;
1.178.2.1  foxr     3964:         $children++;
1.57      www      3965:         &status('Started child '.$pid);
1.1       albertel 3966:         return;
                   3967:     } else {
                   3968:         # Child can *not* return from this subroutine.
                   3969:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
1.126     albertel 3970:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
                   3971:                                 #don't get intercepted
1.57      www      3972:         $SIG{USR1}= \&logstatus;
1.63      www      3973:         $SIG{ALRM}= \&timeout;
1.57      www      3974:         $lastlog='Forked ';
                   3975:         $status='Forked';
                   3976: 
1.1       albertel 3977:         # unblock signals
                   3978:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 3979:             or die "Can't unblock SIGINT for fork: $!\n";
1.13      www      3980: 
1.178.2.1  foxr     3981: 
                   3982: 	
1.91      albertel 3983:         &Authen::Krb5::init_context();
                   3984:         &Authen::Krb5::init_ets();
1.178.2.4! albertel 3985: 	
1.161     foxr     3986: 	&status('Accepted connection');
1.1       albertel 3987: # =============================================================================
                   3988:             # do something with the connection
                   3989: # -----------------------------------------------------------------------------
1.148     foxr     3990: 	# see if we know client and check for spoof IP by challenge
                   3991: 
1.161     foxr     3992: 	ReadManagerTable;	# May also be a manager!!
                   3993: 	
                   3994: 	my $clientrec=($hostid{$clientip}     ne undef);
                   3995: 	my $ismanager=($managers{$clientip}    ne undef);
                   3996: 	$clientname  = "[unknonwn]";
                   3997: 	if($clientrec) {	# Establish client type.
                   3998: 	    $ConnectionType = "client";
                   3999: 	    $clientname = $hostid{$clientip};
                   4000: 	    if($ismanager) {
                   4001: 		$ConnectionType = "both";
                   4002: 	    }
                   4003: 	} else {
                   4004: 	    $ConnectionType = "manager";
                   4005: 	    $clientname = $managers{$clientip};
                   4006: 	}
                   4007: 	my $clientok;
                   4008: 	if ($clientrec || $ismanager) {
                   4009: 	    &status("Waiting for init from $clientip $clientname");
                   4010: 	    &logthis('<font color="yellow">INFO: Connection, '.
                   4011: 		     $clientip.
1.178.2.4! albertel 4012: 		     " ($clientname) connection type = $ConnectionType </font>" );
1.161     foxr     4013: 	    &status("Connecting $clientip  ($clientname))"); 
                   4014: 	    my $remotereq=<$client>;
                   4015: 	    $remotereq=~s/[^\w:]//g;
                   4016: 	    if ($remotereq =~ /^init/) {
                   4017: 		&sethost("sethost:$perlvar{'lonHostID'}");
                   4018: 		my $challenge="$$".time;
                   4019: 		print $client "$challenge\n";
1.178.2.4! albertel 4020: 		&status("Waiting for challenge reply from $clientip ($clientname)"); 
1.161     foxr     4021: 		$remotereq=<$client>;
                   4022: 		$remotereq=~s/\W//g;
                   4023: 		if ($challenge eq $remotereq) {
                   4024: 		    $clientok=1;
                   4025: 		    print $client "ok\n";
                   4026: 		} else {
1.178.2.4! albertel 4027: 		    &logthis("<font color=blue>WARNING: $clientip did not reply challenge</font>");
1.161     foxr     4028: 		    &status('No challenge reply '.$clientip);
                   4029: 		}
1.2       www      4030: 	    } else {
1.178.2.4! albertel 4031: 		&logthis("<font color=blue>WARNING: "
1.161     foxr     4032: 			 ."$clientip failed to initialize: >$remotereq< </font>");
                   4033: 		&status('No init '.$clientip);
                   4034: 	    }
                   4035: 	} else {
1.178.2.4! albertel 4036: 	    &logthis("<font color=blue>WARNING: Unknown client $clientip</font>");
1.161     foxr     4037: 	    &status('Hung up on '.$clientip);
                   4038: 	}
                   4039: 	if ($clientok) {
1.1       albertel 4040: # ---------------- New known client connecting, could mean machine online again
1.161     foxr     4041: 	    
                   4042: 	    foreach my $id (keys(%hostip)) {
                   4043: 		if ($hostip{$id} ne $clientip ||
                   4044: 		    $hostip{$currenthostid} eq $clientip) {
                   4045: 		    # no need to try to do recon's to myself
                   4046: 		    next;
1.115     albertel 4047: 		}
1.161     foxr     4048: 		&reconlonc("$perlvar{'lonSockDir'}/$id");
                   4049: 	    }
                   4050: 	    &logthis("<font color=green>Established connection: $clientname</font>");
                   4051: 	    &status('Will listen to '.$clientname);
                   4052: 
1.178.2.1  foxr     4053: 	    ResetStatistics();
1.161     foxr     4054: 
1.178.2.1  foxr     4055: # ------------------------------------------------------------ Process requests
                   4056: 	    my $KeepGoing = 1;
                   4057: 	    while ((my $userinput=GetRequest) && $KeepGoing) {
                   4058: 		$KeepGoing = ProcessRequest($userinput);
1.177     foxr     4059: # -------------------------------------------------------------------- complete
1.178.2.1  foxr     4060: 
1.161     foxr     4061: 		&status('Listening to '.$clientname);
                   4062: 	    }
1.59      www      4063: # --------------------------------------------- client unknown or fishy, refuse
1.161     foxr     4064: 	} else {
                   4065: 	    print $client "refused\n";
                   4066: 	    $client->close();
                   4067: 	    &logthis("<font color=blue>WARNING: "
                   4068: 		     ."Rejected client $clientip, closing connection</font>");
                   4069: 	}
                   4070:     }             
                   4071:     
1.1       albertel 4072: # =============================================================================
1.161     foxr     4073:     
                   4074:     &logthis("<font color=red>CRITICAL: "
                   4075: 	     ."Disconnect from $clientip ($clientname)</font>");    
                   4076:     
                   4077:     
                   4078:     # this exit is VERY important, otherwise the child will become
                   4079:     # a producer of more and more children, forking yourself into
                   4080:     # process death.
                   4081:     exit;
1.106     foxr     4082:     
1.78      foxr     4083: }
                   4084: 
                   4085: 
                   4086: #
                   4087: #   Checks to see if the input roleput request was to set
                   4088: # an author role.  If so, invokes the lchtmldir script to set
                   4089: # up a correct public_html 
                   4090: # Parameters:
                   4091: #    request   - The request sent to the rolesput subchunk.
                   4092: #                We're looking for  /domain/_au
                   4093: #    domain    - The domain in which the user is having roles doctored.
                   4094: #    user      - Name of the user for which the role is being put.
                   4095: #    authtype  - The authentication type associated with the user.
                   4096: #
1.178.2.4! albertel 4097: sub ManagePermissions {
1.78      foxr     4098:     my $request = shift;
                   4099:     my $domain  = shift;
                   4100:     my $user    = shift;
                   4101:     my $authtype= shift;
                   4102: 
                   4103:     # See if the request is of the form /$domain/_au
1.178.2.1  foxr     4104:     &logthis("ruequest is $request");
1.78      foxr     4105:     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
                   4106: 	my $execdir = $perlvar{'lonDaemons'};
                   4107: 	my $userhome= "/home/$user" ;
1.134     albertel 4108: 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.78      foxr     4109: 	system("$execdir/lchtmldir $userhome $user $authtype");
                   4110:     }
                   4111: }
                   4112: #
                   4113: #   GetAuthType - Determines the authorization type of a user in a domain.
                   4114: 
                   4115: #     Returns the authorization type or nouser if there is no such user.
                   4116: #
1.178.2.4! albertel 4117: sub GetAuthType {
1.78      foxr     4118:     my $domain = shift;
                   4119:     my $user   = shift;
                   4120: 
1.79      foxr     4121:     Debug("GetAuthType( $domain, $user ) \n");
1.78      foxr     4122:     my $proname    = &propath($domain, $user); 
                   4123:     my $passwdfile = "$proname/passwd";
                   4124:     if( -e $passwdfile ) {
                   4125: 	my $pf = IO::File->new($passwdfile);
                   4126: 	my $realpassword = <$pf>;
                   4127: 	chomp($realpassword);
1.79      foxr     4128: 	Debug("Password info = $realpassword\n");
1.78      foxr     4129: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79      foxr     4130: 	Debug("Authtype = $authtype, content = $contentpwd\n");
1.78      foxr     4131: 	my $availinfo = '';
1.91      albertel 4132: 	if($authtype eq 'krb4' or $authtype eq 'krb5') {
1.78      foxr     4133: 	    $availinfo = $contentpwd;
                   4134: 	}
1.79      foxr     4135: 
1.78      foxr     4136: 	return "$authtype:$availinfo";
1.178.2.4! albertel 4137:     } else {
1.79      foxr     4138: 	Debug("Returning nouser");
1.78      foxr     4139: 	return "nouser";
                   4140:     }
1.1       albertel 4141: }
                   4142: 
1.84      albertel 4143: sub addline {
                   4144:     my ($fname,$hostid,$ip,$newline)=@_;
                   4145:     my $contents;
                   4146:     my $found=0;
                   4147:     my $expr='^'.$hostid.':'.$ip.':';
                   4148:     $expr =~ s/\./\\\./g;
1.134     albertel 4149:     my $sh;
1.84      albertel 4150:     if ($sh=IO::File->new("$fname.subscription")) {
                   4151: 	while (my $subline=<$sh>) {
                   4152: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
                   4153: 	}
                   4154: 	$sh->close();
                   4155:     }
                   4156:     $sh=IO::File->new(">$fname.subscription");
                   4157:     if ($contents) { print $sh $contents; }
                   4158:     if ($newline) { print $sh $newline; }
                   4159:     $sh->close();
                   4160:     return $found;
1.86      www      4161: }
                   4162: 
                   4163: sub getchat {
1.122     www      4164:     my ($cdom,$cname,$udom,$uname)=@_;
1.87      www      4165:     my %hash;
                   4166:     my $proname=&propath($cdom,$cname);
                   4167:     my @entries=();
1.88      albertel 4168:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   4169: 	    &GDBM_READER(),0640)) {
                   4170: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   4171: 	untie %hash;
1.123     www      4172:     }
1.124     www      4173:     my @participants=();
1.134     albertel 4174:     my $cutoff=time-60;
1.123     www      4175:     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
1.124     www      4176: 	    &GDBM_WRCREAT(),0640)) {
                   4177:         $hash{$uname.':'.$udom}=time;
1.123     www      4178:         foreach (sort keys %hash) {
                   4179: 	    if ($hash{$_}>$cutoff) {
1.124     www      4180: 		$participants[$#participants+1]='active_participant:'.$_;
1.123     www      4181:             }
                   4182:         }
                   4183:         untie %hash;
1.86      www      4184:     }
1.124     www      4185:     return (@participants,@entries);
1.86      www      4186: }
                   4187: 
                   4188: sub chatadd {
1.88      albertel 4189:     my ($cdom,$cname,$newchat)=@_;
                   4190:     my %hash;
                   4191:     my $proname=&propath($cdom,$cname);
                   4192:     my @entries=();
1.142     www      4193:     my $time=time;
1.88      albertel 4194:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   4195: 	    &GDBM_WRCREAT(),0640)) {
                   4196: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   4197: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
                   4198: 	my ($thentime,$idnum)=split(/\_/,$lastid);
                   4199: 	my $newid=$time.'_000000';
                   4200: 	if ($thentime==$time) {
                   4201: 	    $idnum=~s/^0+//;
                   4202: 	    $idnum++;
                   4203: 	    $idnum=substr('000000'.$idnum,-6,6);
                   4204: 	    $newid=$time.'_'.$idnum;
                   4205: 	}
                   4206: 	$hash{$newid}=$newchat;
                   4207: 	my $expired=$time-3600;
                   4208: 	foreach (keys %hash) {
                   4209: 	    my ($thistime)=($_=~/(\d+)\_/);
                   4210: 	    if ($thistime<$expired) {
1.89      www      4211: 		delete $hash{$_};
1.88      albertel 4212: 	    }
                   4213: 	}
                   4214: 	untie %hash;
1.142     www      4215:     }
                   4216:     {
                   4217: 	my $hfh;
                   4218: 	if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 
                   4219: 	    print $hfh "$time:".&unescape($newchat)."\n";
                   4220: 	}
1.86      www      4221:     }
1.84      albertel 4222: }
                   4223: 
                   4224: sub unsub {
                   4225:     my ($fname,$clientip)=@_;
                   4226:     my $result;
1.161     foxr     4227:     if (unlink("$fname.$clientname")) {
1.84      albertel 4228: 	$result="ok\n";
                   4229:     } else {
                   4230: 	$result="not_subscribed\n";
                   4231:     }
                   4232:     if (-e "$fname.subscription") {
1.161     foxr     4233: 	my $found=&addline($fname,$clientname,$clientip,'');
1.84      albertel 4234: 	if ($found) { $result="ok\n"; }
                   4235:     } else {
                   4236: 	if ($result != "ok\n") { $result="not_subscribed\n"; }
                   4237:     }
                   4238:     return $result;
                   4239: }
                   4240: 
1.101     www      4241: sub currentversion {
                   4242:     my $fname=shift;
                   4243:     my $version=-1;
                   4244:     my $ulsdir='';
                   4245:     if ($fname=~/^(.+)\/[^\/]+$/) {
1.178.2.4! albertel 4246: 	$ulsdir=$1;
1.101     www      4247:     }
1.114     albertel 4248:     my ($fnamere1,$fnamere2);
                   4249:     # remove version if already specified
1.101     www      4250:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114     albertel 4251:     # get the bits that go before and after the version number
                   4252:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
                   4253: 	$fnamere1=$1;
                   4254: 	$fnamere2='.'.$2;
                   4255:     }
1.101     www      4256:     if (-e $fname) { $version=1; }
                   4257:     if (-e $ulsdir) {
1.134     albertel 4258: 	if(-d $ulsdir) {
                   4259: 	    if (opendir(LSDIR,$ulsdir)) {
                   4260: 		my $ulsfn;
                   4261: 		while ($ulsfn=readdir(LSDIR)) {
1.101     www      4262: # see if this is a regular file (ignore links produced earlier)
1.134     albertel 4263: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
                   4264: 		    unless (-l $thisfile) {
1.160     www      4265: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134     albertel 4266: 			    if ($1>$version) { $version=$1; }
                   4267: 			}
                   4268: 		    }
                   4269: 		}
                   4270: 		closedir(LSDIR);
                   4271: 		$version++;
                   4272: 	    }
                   4273: 	}
                   4274:     }
                   4275:     return $version;
1.101     www      4276: }
                   4277: 
                   4278: sub thisversion {
                   4279:     my $fname=shift;
                   4280:     my $version=-1;
                   4281:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
                   4282: 	$version=$1;
                   4283:     }
                   4284:     return $version;
                   4285: }
                   4286: 
1.84      albertel 4287: sub subscribe {
                   4288:     my ($userinput,$clientip)=@_;
                   4289:     my $result;
                   4290:     my ($cmd,$fname)=split(/:/,$userinput);
                   4291:     my $ownership=&ishome($fname);
                   4292:     if ($ownership eq 'owner') {
1.101     www      4293: # explitly asking for the current version?
                   4294:         unless (-e $fname) {
                   4295:             my $currentversion=&currentversion($fname);
                   4296: 	    if (&thisversion($fname)==$currentversion) {
                   4297:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
                   4298: 		    my $root=$1;
                   4299:                     my $extension=$2;
                   4300:                     symlink($root.'.'.$extension,
                   4301:                             $root.'.'.$currentversion.'.'.$extension);
1.102     www      4302:                     unless ($extension=~/\.meta$/) {
1.178.2.4! albertel 4303: 			symlink($root.'.'.$extension.'.meta',
        !          4304: 				$root.'.'.$currentversion.'.'.$extension.'.meta');
1.102     www      4305: 		    }
1.101     www      4306:                 }
                   4307:             }
                   4308:         }
1.84      albertel 4309: 	if (-e $fname) {
                   4310: 	    if (-d $fname) {
                   4311: 		$result="directory\n";
                   4312: 	    } else {
1.161     foxr     4313: 		if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134     albertel 4314: 		my $now=time;
1.161     foxr     4315: 		my $found=&addline($fname,$clientname,$clientip,
                   4316: 				   "$clientname:$clientip:$now\n");
1.84      albertel 4317: 		if ($found) { $result="$fname\n"; }
                   4318: 		# if they were subscribed to only meta data, delete that
                   4319:                 # subscription, when you subscribe to a file you also get
                   4320:                 # the metadata
                   4321: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
                   4322: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
                   4323: 		$fname="http://$thisserver/".$fname;
                   4324: 		$result="$fname\n";
                   4325: 	    }
                   4326: 	} else {
                   4327: 	    $result="not_found\n";
                   4328: 	}
                   4329:     } else {
                   4330: 	$result="rejected\n";
                   4331:     }
                   4332:     return $result;
                   4333: }
1.91      albertel 4334: 
                   4335: sub make_passwd_file {
1.98      foxr     4336:     my ($uname, $umode,$npass,$passfilename)=@_;
1.91      albertel 4337:     my $result="ok\n";
                   4338:     if ($umode eq 'krb4' or $umode eq 'krb5') {
                   4339: 	{
                   4340: 	    my $pf = IO::File->new(">$passfilename");
                   4341: 	    print $pf "$umode:$npass\n";
                   4342: 	}
                   4343:     } elsif ($umode eq 'internal') {
                   4344: 	my $salt=time;
                   4345: 	$salt=substr($salt,6,2);
                   4346: 	my $ncpass=crypt($npass,$salt);
                   4347: 	{
                   4348: 	    &Debug("Creating internal auth");
                   4349: 	    my $pf = IO::File->new(">$passfilename");
                   4350: 	    print $pf "internal:$ncpass\n"; 
                   4351: 	}
                   4352:     } elsif ($umode eq 'localauth') {
                   4353: 	{
                   4354: 	    my $pf = IO::File->new(">$passfilename");
                   4355: 	    print $pf "localauth:$npass\n";
                   4356: 	}
                   4357:     } elsif ($umode eq 'unix') {
                   4358: 	{
                   4359: 	    my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
                   4360: 	    {
                   4361: 		&Debug("Executing external: ".$execpath);
1.98      foxr     4362: 		&Debug("user  = ".$uname.", Password =". $npass);
1.132     matthew  4363: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91      albertel 4364: 		print $se "$uname\n";
                   4365: 		print $se "$npass\n";
                   4366: 		print $se "$npass\n";
1.97      foxr     4367: 	    }
                   4368: 	    my $useraddok = $?;
                   4369: 	    if($useraddok > 0) {
                   4370: 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
1.91      albertel 4371: 	    }
                   4372: 	    my $pf = IO::File->new(">$passfilename");
                   4373: 	    print $pf "unix:\n";
                   4374: 	}
                   4375:     } elsif ($umode eq 'none') {
                   4376: 	{
                   4377: 	    my $pf = IO::File->new(">$passfilename");
                   4378: 	    print $pf "none:\n";
                   4379: 	}
                   4380:     } else {
                   4381: 	$result="auth_mode_error\n";
                   4382:     }
                   4383:     return $result;
1.121     albertel 4384: }
                   4385: 
                   4386: sub sethost {
                   4387:     my ($remotereq) = @_;
                   4388:     my (undef,$hostid)=split(/:/,$remotereq);
                   4389:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
                   4390:     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
                   4391: 	$currenthostid=$hostid;
                   4392: 	$currentdomainid=$hostdom{$hostid};
                   4393: 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
                   4394:     } else {
                   4395: 	&logthis("Requested host id $hostid not an alias of ".
                   4396: 		 $perlvar{'lonHostID'}." refusing connection");
                   4397: 	return 'unable_to_set';
                   4398:     }
                   4399:     return 'ok';
                   4400: }
                   4401: 
                   4402: sub version {
                   4403:     my ($userinput)=@_;
                   4404:     $remoteVERSION=(split(/:/,$userinput))[1];
                   4405:     return "version:$VERSION";
1.127     albertel 4406: }
1.178.2.1  foxr     4407: ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<<
1.128     albertel 4408: #There is a copy of this in lonnet.pm
1.178.2.1  foxr     4409: #   Can we hoist these lil' things out into common places?
                   4410: #
1.127     albertel 4411: sub userload {
                   4412:     my $numusers=0;
                   4413:     {
                   4414: 	opendir(LONIDS,$perlvar{'lonIDsDir'});
                   4415: 	my $filename;
                   4416: 	my $curtime=time;
                   4417: 	while ($filename=readdir(LONIDS)) {
                   4418: 	    if ($filename eq '.' || $filename eq '..') {next;}
1.138     albertel 4419: 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159     albertel 4420: 	    if ($curtime-$mtime < 1800) { $numusers++; }
1.127     albertel 4421: 	}
                   4422: 	closedir(LONIDS);
                   4423:     }
                   4424:     my $userloadpercent=0;
                   4425:     my $maxuserload=$perlvar{'lonUserLoadLim'};
                   4426:     if ($maxuserload) {
1.129     albertel 4427: 	$userloadpercent=100*$numusers/$maxuserload;
1.127     albertel 4428:     }
1.130     albertel 4429:     $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127     albertel 4430:     return $userloadpercent;
1.91      albertel 4431: }
                   4432: 
1.61      harris41 4433: # ----------------------------------- POD (plain old documentation, CPAN style)
                   4434: 
                   4435: =head1 NAME
                   4436: 
                   4437: lond - "LON Daemon" Server (port "LOND" 5663)
                   4438: 
                   4439: =head1 SYNOPSIS
                   4440: 
1.74      harris41 4441: Usage: B<lond>
                   4442: 
                   4443: Should only be run as user=www.  This is a command-line script which
                   4444: is invoked by B<loncron>.  There is no expectation that a typical user
                   4445: will manually start B<lond> from the command-line.  (In other words,
                   4446: DO NOT START B<lond> YOURSELF.)
1.61      harris41 4447: 
                   4448: =head1 DESCRIPTION
                   4449: 
1.74      harris41 4450: There are two characteristics associated with the running of B<lond>,
                   4451: PROCESS MANAGEMENT (starting, stopping, handling child processes)
                   4452: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
                   4453: subscriptions, etc).  These are described in two large
                   4454: sections below.
                   4455: 
                   4456: B<PROCESS MANAGEMENT>
                   4457: 
1.61      harris41 4458: Preforker - server who forks first. Runs as a daemon. HUPs.
                   4459: Uses IDEA encryption
                   4460: 
1.74      harris41 4461: B<lond> forks off children processes that correspond to the other servers
                   4462: in the network.  Management of these processes can be done at the
                   4463: parent process level or the child process level.
                   4464: 
                   4465: B<logs/lond.log> is the location of log messages.
                   4466: 
                   4467: The process management is now explained in terms of linux shell commands,
                   4468: subroutines internal to this code, and signal assignments:
                   4469: 
                   4470: =over 4
                   4471: 
                   4472: =item *
                   4473: 
                   4474: PID is stored in B<logs/lond.pid>
                   4475: 
                   4476: This is the process id number of the parent B<lond> process.
                   4477: 
                   4478: =item *
                   4479: 
                   4480: SIGTERM and SIGINT
                   4481: 
                   4482: Parent signal assignment:
                   4483:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   4484: 
                   4485: Child signal assignment:
                   4486:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
                   4487: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
                   4488:  to restart a new child.)
                   4489: 
                   4490: Command-line invocations:
                   4491:  B<kill> B<-s> SIGTERM I<PID>
                   4492:  B<kill> B<-s> SIGINT I<PID>
                   4493: 
                   4494: Subroutine B<HUNTSMAN>:
                   4495:  This is only invoked for the B<lond> parent I<PID>.
                   4496: This kills all the children, and then the parent.
                   4497: The B<lonc.pid> file is cleared.
                   4498: 
                   4499: =item *
                   4500: 
                   4501: SIGHUP
                   4502: 
                   4503: Current bug:
                   4504:  This signal can only be processed the first time
                   4505: on the parent process.  Subsequent SIGHUP signals
                   4506: have no effect.
                   4507: 
                   4508: Parent signal assignment:
                   4509:  $SIG{HUP}  = \&HUPSMAN;
                   4510: 
                   4511: Child signal assignment:
                   4512:  none (nothing happens)
                   4513: 
                   4514: Command-line invocations:
                   4515:  B<kill> B<-s> SIGHUP I<PID>
                   4516: 
                   4517: Subroutine B<HUPSMAN>:
                   4518:  This is only invoked for the B<lond> parent I<PID>,
                   4519: This kills all the children, and then the parent.
                   4520: The B<lond.pid> file is cleared.
                   4521: 
                   4522: =item *
                   4523: 
                   4524: SIGUSR1
                   4525: 
                   4526: Parent signal assignment:
                   4527:  $SIG{USR1} = \&USRMAN;
                   4528: 
                   4529: Child signal assignment:
                   4530:  $SIG{USR1}= \&logstatus;
                   4531: 
                   4532: Command-line invocations:
                   4533:  B<kill> B<-s> SIGUSR1 I<PID>
                   4534: 
                   4535: Subroutine B<USRMAN>:
                   4536:  When invoked for the B<lond> parent I<PID>,
                   4537: SIGUSR1 is sent to all the children, and the status of
                   4538: each connection is logged.
1.144     foxr     4539: 
                   4540: =item *
                   4541: 
                   4542: SIGUSR2
                   4543: 
                   4544: Parent Signal assignment:
                   4545:     $SIG{USR2} = \&UpdateHosts
                   4546: 
                   4547: Child signal assignment:
                   4548:     NONE
                   4549: 
1.74      harris41 4550: 
                   4551: =item *
                   4552: 
                   4553: SIGCHLD
                   4554: 
                   4555: Parent signal assignment:
                   4556:  $SIG{CHLD} = \&REAPER;
                   4557: 
                   4558: Child signal assignment:
                   4559:  none
                   4560: 
                   4561: Command-line invocations:
                   4562:  B<kill> B<-s> SIGCHLD I<PID>
                   4563: 
                   4564: Subroutine B<REAPER>:
                   4565:  This is only invoked for the B<lond> parent I<PID>.
                   4566: Information pertaining to the child is removed.
                   4567: The socket port is cleaned up.
                   4568: 
                   4569: =back
                   4570: 
                   4571: B<SERVER-SIDE ACTIVITIES>
                   4572: 
                   4573: Server-side information can be accepted in an encrypted or non-encrypted
                   4574: method.
                   4575: 
                   4576: =over 4
                   4577: 
                   4578: =item ping
                   4579: 
                   4580: Query a client in the hosts.tab table; "Are you there?"
                   4581: 
                   4582: =item pong
                   4583: 
                   4584: Respond to a ping query.
                   4585: 
                   4586: =item ekey
                   4587: 
                   4588: Read in encrypted key, make cipher.  Respond with a buildkey.
                   4589: 
                   4590: =item load
                   4591: 
                   4592: Respond with CPU load based on a computation upon /proc/loadavg.
                   4593: 
                   4594: =item currentauth
                   4595: 
                   4596: Reply with current authentication information (only over an
                   4597: encrypted channel).
                   4598: 
                   4599: =item auth
                   4600: 
                   4601: Only over an encrypted channel, reply as to whether a user's
                   4602: authentication information can be validated.
                   4603: 
                   4604: =item passwd
                   4605: 
                   4606: Allow for a password to be set.
                   4607: 
                   4608: =item makeuser
                   4609: 
                   4610: Make a user.
                   4611: 
                   4612: =item passwd
                   4613: 
                   4614: Allow for authentication mechanism and password to be changed.
                   4615: 
                   4616: =item home
1.61      harris41 4617: 
1.74      harris41 4618: Respond to a question "are you the home for a given user?"
                   4619: 
                   4620: =item update
                   4621: 
                   4622: Update contents of a subscribed resource.
                   4623: 
                   4624: =item unsubscribe
                   4625: 
                   4626: The server is unsubscribing from a resource.
                   4627: 
                   4628: =item subscribe
                   4629: 
                   4630: The server is subscribing to a resource.
                   4631: 
                   4632: =item log
                   4633: 
                   4634: Place in B<logs/lond.log>
                   4635: 
                   4636: =item put
                   4637: 
                   4638: stores hash in namespace
                   4639: 
                   4640: =item rolesput
                   4641: 
                   4642: put a role into a user's environment
                   4643: 
                   4644: =item get
                   4645: 
                   4646: returns hash with keys from array
                   4647: reference filled in from namespace
                   4648: 
                   4649: =item eget
                   4650: 
                   4651: returns hash with keys from array
                   4652: reference filled in from namesp (encrypts the return communication)
                   4653: 
                   4654: =item rolesget
                   4655: 
                   4656: get a role from a user's environment
                   4657: 
                   4658: =item del
                   4659: 
                   4660: deletes keys out of array from namespace
                   4661: 
                   4662: =item keys
                   4663: 
                   4664: returns namespace keys
                   4665: 
                   4666: =item dump
                   4667: 
                   4668: dumps the complete (or key matching regexp) namespace into a hash
                   4669: 
                   4670: =item store
                   4671: 
                   4672: stores hash permanently
                   4673: for this url; hashref needs to be given and should be a \%hashname; the
                   4674: remaining args aren't required and if they aren't passed or are '' they will
                   4675: be derived from the ENV
                   4676: 
                   4677: =item restore
                   4678: 
                   4679: returns a hash for a given url
                   4680: 
                   4681: =item querysend
                   4682: 
                   4683: Tells client about the lonsql process that has been launched in response
                   4684: to a sent query.
                   4685: 
                   4686: =item queryreply
                   4687: 
                   4688: Accept information from lonsql and make appropriate storage in temporary
                   4689: file space.
                   4690: 
                   4691: =item idput
                   4692: 
                   4693: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
                   4694: for each student, defined perhaps by the institutional Registrar.)
                   4695: 
                   4696: =item idget
                   4697: 
                   4698: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
                   4699: for each student, defined perhaps by the institutional Registrar.)
                   4700: 
                   4701: =item tmpput
                   4702: 
                   4703: Accept and store information in temporary space.
                   4704: 
                   4705: =item tmpget
                   4706: 
                   4707: Send along temporarily stored information.
                   4708: 
                   4709: =item ls
                   4710: 
                   4711: List part of a user's directory.
                   4712: 
1.135     foxr     4713: =item pushtable
                   4714: 
                   4715: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
                   4716: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
                   4717: must be restored manually in case of a problem with the new table file.
                   4718: pushtable requires that the request be encrypted and validated via
                   4719: ValidateManager.  The form of the command is:
                   4720: enc:pushtable tablename <tablecontents> \n
                   4721: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
                   4722: cleartext newline.
                   4723: 
1.74      harris41 4724: =item Hanging up (exit or init)
                   4725: 
                   4726: What to do when a client tells the server that they (the client)
                   4727: are leaving the network.
                   4728: 
                   4729: =item unknown command
                   4730: 
                   4731: If B<lond> is sent an unknown command (not in the list above),
                   4732: it replys to the client "unknown_cmd".
1.135     foxr     4733: 
1.74      harris41 4734: 
                   4735: =item UNKNOWN CLIENT
                   4736: 
                   4737: If the anti-spoofing algorithm cannot verify the client,
                   4738: the client is rejected (with a "refused" message sent
                   4739: to the client, and the connection is closed.
                   4740: 
                   4741: =back
1.61      harris41 4742: 
                   4743: =head1 PREREQUISITES
                   4744: 
                   4745: IO::Socket
                   4746: IO::File
                   4747: Apache::File
                   4748: Symbol
                   4749: POSIX
                   4750: Crypt::IDEA
                   4751: LWP::UserAgent()
                   4752: GDBM_File
                   4753: Authen::Krb4
1.91      albertel 4754: Authen::Krb5
1.61      harris41 4755: 
                   4756: =head1 COREQUISITES
                   4757: 
                   4758: =head1 OSNAMES
                   4759: 
                   4760: linux
                   4761: 
                   4762: =head1 SCRIPT CATEGORIES
                   4763: 
                   4764: Server/Process
                   4765: 
                   4766: =cut

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