Annotation of loncom/lond, revision 1.178.2.5

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network
                      3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60      www         4: #
1.178.2.5! albertel    5: # $Id: lond,v 1.178.2.4 2004/02/24 16:51:40 albertel 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: 
1.178.2.5! albertel   56: my $VERSION='$Revision: 1.178.2.4 $'; #' 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: 	while (my ($key,$value) = each(%hash)) {
                   1874: 	    if ($regexp eq '.') {
                   1875: 		$qresult.=$key.'='.$value.'&';
                   1876: 	    } else {
                   1877: 		my $unescapeKey = &unescape($key);
                   1878: 		if (eval('$unescapeKey=~/$regexp/')) {
                   1879: 		    $qresult.="$key=$value&";
                   1880: 		}
                   1881: 	    }
                   1882: 	}
                   1883: 	if (untie(%hash)) {
                   1884: 	    chop($qresult);
                   1885: 	    Reply($client, "$qresult\n", $userinput);
                   1886: 	} else {
                   1887: 	    Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   1888: 		     "while attempting dump\n", $userinput);
                   1889: 	}
                   1890:     } else {
                   1891: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   1892: 		"while attempting dump\n", $userinput);
                   1893:     }
1.178.2.1  foxr     1894: 
                   1895:     return 1;
                   1896: }
                   1897: RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0);
                   1898: 
                   1899: #  Store an aitem in any database but the roles database.
                   1900: #
                   1901: #  Parameters:
                   1902: #    $cmd                - Request command keyword.
                   1903: #    $tail               - Tail of the request.  This is a colon
                   1904: #                          separated list containing:
                   1905: #                          domain/user - User and authentication domain.
                   1906: #                          namespace   - Name of the database being modified
                   1907: #                          rid         - Resource keyword to modify.
                   1908: #                          what        - new value associated with rid.
                   1909: #
                   1910: #    $client             - Socket open on the client.
                   1911: #
                   1912: #
                   1913: #  Returns:
                   1914: #      1 (keep on processing).
                   1915: #  Side-Effects:
                   1916: #    Writes to the client
                   1917: sub StoreHandler {
1.178.2.4  albertel 1918:     my $cmd    = shift;
                   1919:     my $tail   = shift;
                   1920:     my $client = shift;
1.178.2.1  foxr     1921:  
1.178.2.4  albertel 1922:     my $userinput = "$cmd:$tail";
1.178.2.1  foxr     1923: 
1.178.2.4  albertel 1924:     my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
                   1925:     $namespace=~s/\//\_/g;
                   1926:     $namespace=~s/\W//g;
                   1927:     if ($namespace ne 'roles') {
                   1928: 	chomp($what);
                   1929: 	my $proname=propath($udom,$uname);
                   1930: 	my $now=time;
                   1931: 	unless ($namespace=~/^nohist\_/) {
                   1932: 	    my $hfh;
                   1933: 	    if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
                   1934: 		print $hfh "P:$now:$rid:$what\n"; 
                   1935: 	    }
                   1936: 	}
                   1937: 	my @pairs=split(/\&/,$what);
                   1938: 	my %hash;
                   1939: 	if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
                   1940: 		&GDBM_WRCREAT(),0640)) {
                   1941: 	    my @previouskeys=split(/&/,$hash{"keys:$rid"});
                   1942: 	    my $key;
                   1943: 	    $hash{"version:$rid"}++;
                   1944: 	    my $version=$hash{"version:$rid"};
                   1945: 	    my $allkeys=''; 
                   1946: 	    foreach my $pair (@pairs) {
                   1947: 		my ($key,$value)=split(/=/,$pair);
                   1948: 		$allkeys.=$key.':';
                   1949: 		$hash{"$version:$rid:$key"}=$value;
                   1950: 	    }
                   1951: 	    $hash{"$version:$rid:timestamp"}=$now;
                   1952: 	    $allkeys.='timestamp';
                   1953: 	    $hash{"$version:keys:$rid"}=$allkeys;
                   1954: 	    if (untie(%hash)) {
                   1955: 		Reply($client, "ok\n", $userinput);
                   1956: 	    } else {
                   1957: 		Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   1958: 			"while attempting store\n", $userinput);
                   1959: 	    }
                   1960: 	} else {
                   1961: 	    Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   1962: 		     "while attempting store\n", $userinput);
                   1963: 	}
                   1964:     } else {
                   1965: 	Failure($client, "refused\n", $userinput);
1.178.2.1  foxr     1966:     }
                   1967: 
1.178.2.4  albertel 1968:     return 1;
1.178.2.1  foxr     1969: }
                   1970: RegisterHandler("store", \&StoreHandler, 0, 1, 0);
                   1971: #
                   1972: #   Restore a prior version of a resource.
                   1973: #
                   1974: #  Parameters:
                   1975: #     $cmd               - Command keyword.
                   1976: #     $tail              - Remainder of the request which consists of:
                   1977: #                          domain/user   - User and auth. domain.
                   1978: #                          namespace     - name of resource database.
                   1979: #                          rid           - Resource id.
                   1980: #    $client             - socket open on the client.
                   1981: #
                   1982: # Returns:
                   1983: #      1  indicating the caller should not yet exit.
                   1984: # Side-effects:
                   1985: #   Writes a reply to the client.
                   1986: #
                   1987: sub RestoreHandler {
1.178.2.4  albertel 1988:     my $cmd     = shift;
                   1989:     my $tail    = shift;
                   1990:     my $client  = shift;
                   1991: 
                   1992:     my $userinput = "$cmd:$tail";	# Only used for logging purposes.
                   1993: 
                   1994:     my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
                   1995:     $namespace=~s/\//\_/g;
                   1996:     $namespace=~s/\W//g;
                   1997:     chomp($rid);
                   1998:     my $proname=propath($udom,$uname);
                   1999:     my $qresult='';
                   2000:     my %hash;
                   2001:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
                   2002: 	    &GDBM_READER(),0640)) {
                   2003: 	my $version=$hash{"version:$rid"};
                   2004: 	$qresult.="version=$version&";
                   2005: 	my $scope;
                   2006: 	for ($scope=1;$scope<=$version;$scope++) {
                   2007: 	    my $vkeys=$hash{"$scope:keys:$rid"};
                   2008: 	    my @keys=split(/:/,$vkeys);
                   2009: 	    my $key;
                   2010: 	    $qresult.="$scope:keys=$vkeys&";
                   2011: 	    foreach $key (@keys) {
                   2012: 		$qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
                   2013: 	    }                                  
                   2014: 	}
                   2015: 	if (untie(%hash)) {
                   2016: 	    $qresult=~s/\&$//;
                   2017: 	    Reply( $client, "$qresult\n", $userinput);
                   2018: 	} else {
                   2019: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2020: 		    "while attempting restore\n", $userinput);
                   2021: 	}
                   2022:     } else {
                   2023: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2024: 		"while attempting restore\n", $userinput);
                   2025:     }
1.178.2.1  foxr     2026:   
1.178.2.4  albertel 2027:     return 1;
1.178.2.1  foxr     2028: 
                   2029: 
                   2030: }
                   2031: RegisterHandler("restor", \&RestoreHandler, 0,1,0);
                   2032: 
                   2033: #
                   2034: #   Add a chat message to to a discussion board.
                   2035: #
                   2036: # Parameters:
                   2037: #    $cmd                - Request keyword.
                   2038: #    $tail               - Tail of the command. A colon separated list
                   2039: #                          containing:
                   2040: #                          cdom    - Domain on which the chat board lives
                   2041: #                          cnum    - Identifier of the discussion group.
                   2042: #                          post    - Body of the posting.
                   2043: #   $client              - Socket open on the client.
                   2044: # Returns:
                   2045: #   1    - Indicating caller should keep on processing.
                   2046: #
                   2047: # Side-effects:
                   2048: #   writes a reply to the client.
                   2049: #
                   2050: #
                   2051: sub SendChatHandler {
1.178.2.4  albertel 2052:     my $cmd     = shift;
                   2053:     my $tail    = shift;
                   2054:     my $client  = shift;
                   2055:     
                   2056:     my $userinput = "$cmd:$tail";
1.178.2.1  foxr     2057: 
1.178.2.4  albertel 2058:     my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
                   2059:     &chatadd($cdom,$cnum,$newpost);
                   2060:     Reply($client, "ok\n", $userinput);
1.178.2.1  foxr     2061: 
1.178.2.4  albertel 2062:     return 1;
1.178.2.1  foxr     2063: }
                   2064: RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0);
                   2065: #
                   2066: #   Retrieve the set of chat messagss from a discussion board.
                   2067: #
                   2068: #  Parameters:
                   2069: #    $cmd             - Command keyword that initiated the request.
                   2070: #    $tail            - Remainder of the request after the command
                   2071: #                       keyword.  In this case a colon separated list of
                   2072: #                       chat domain    - Which discussion board.
                   2073: #                       chat id        - Discussion thread(?)
                   2074: #                       domain/user    - Authentication domain and username
                   2075: #                                        of the requesting person.
                   2076: #   $client           - Socket open on the client program.
                   2077: # Returns:
                   2078: #    1     - continue processing
                   2079: # Side effects:
                   2080: #    Response is written to the client.
                   2081: #
                   2082: sub RetrieveChatHandler {
1.178.2.4  albertel 2083:     my $cmd      = shift;
                   2084:     my $tail     = shift;
                   2085:     my $client   = shift;
                   2086: 
                   2087:     my $userinput = "$cmd:$tail";
                   2088: 
                   2089:     my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
                   2090:     my $reply='';
                   2091:     foreach (&getchat($cdom,$cnum,$udom,$uname)) {
                   2092: 	$reply.=&escape($_).':';
                   2093:     }
                   2094:     $reply=~s/\:$//;
                   2095:     Reply($client, $reply."\n", $userinput);
1.178.2.1  foxr     2096: 
                   2097: 
1.178.2.4  albertel 2098:     return 1;
1.178.2.1  foxr     2099: }
                   2100: RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0);
                   2101: #
                   2102: #  Initiate a query of an sql database.  SQL query repsonses get put in
                   2103: #  a file for later retrieval.  This prevents sql query results from
                   2104: #  bottlenecking the system.  Note that with loncnew, perhaps this is
                   2105: #  less of an issue since multiple outstanding requests can be concurrently
                   2106: #  serviced.
                   2107: #
                   2108: #  Parameters:
                   2109: #     $cmd       - COmmand keyword that initiated the request.
                   2110: #     $tail      - Remainder of the command after the keyword.
                   2111: #                  For this function, this consists of a query and
                   2112: #                  3 arguments that are self-documentingly labelled
                   2113: #                  in the original arg1, arg2, arg3.
                   2114: #     $client    - Socket open on the client.
                   2115: # Return:
                   2116: #    1   - Indicating processing should continue.
                   2117: # Side-effects:
                   2118: #    a reply is written to $client.
                   2119: #
                   2120: sub SendQueryHandler {
1.178.2.4  albertel 2121:     my $cmd     = shift;
                   2122:     my $tail    = shift;
                   2123:     my $client  = shift;
                   2124: 
                   2125:     my $userinput = "$cmd:$tail";
                   2126: 
                   2127:     my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
                   2128:     $query=~s/\n*$//g;
                   2129:     Reply($client, "". sqlreply("$clientname\&$query".
                   2130: 				"\&$arg1"."\&$arg2"."\&$arg3")."\n",
                   2131: 	  $userinput);
                   2132:     
                   2133:     return 1;
1.178.2.1  foxr     2134: }
                   2135: RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0);
                   2136: 
                   2137: #
                   2138: #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
                   2139: #   The query is submitted via a "querysend" transaction.
                   2140: #   There it is passed on to the lonsql daemon, queued and issued to
                   2141: #   mysql.
                   2142: #     This transaction is invoked when the sql transaction is complete
                   2143: #   it stores the query results in flie and indicates query completion.
                   2144: #   presumably local software then fetches this response... I'm guessing
                   2145: #   the sequence is: lonc does a querysend, we ask lonsql to do it.
                   2146: #   lonsql on completion of the query interacts with the lond of our
                   2147: #   client to do a query reply storing two files:
                   2148: #    - id     - The results of the query.
                   2149: #    - id.end - Indicating the transaction completed. 
                   2150: #    NOTE: id is a unique id assigned to the query and querysend time.
                   2151: # Parameters:
                   2152: #    $cmd        - Command keyword that initiated this request.
                   2153: #    $tail       - Remainder of the tail.  In this case that's a colon
                   2154: #                  separated list containing the query Id and the 
                   2155: #                  results of the query.
                   2156: #    $client     - Socket open on the client.
                   2157: # Return:
                   2158: #    1           - Indicating that we should continue processing.
                   2159: # Side effects:
                   2160: #    ok written to the client.
                   2161: #
                   2162: sub ReplyQueryHandler {
1.178.2.4  albertel 2163:     my $cmd    = shift;
                   2164:     my $tail   = shift;
                   2165:     my $client = shift;
                   2166: 
                   2167:     my $userinput = "$cmd:$tail";
                   2168: 
                   2169:     my ($cmd,$id,$reply)=split(/:/,$userinput); 
                   2170:     my $store;
                   2171:     my $execdir=$perlvar{'lonDaemons'};
                   2172:     if ($store=IO::File->new(">$execdir/tmp/$id")) {
                   2173: 	$reply=~s/\&/\n/g;
                   2174: 	print $store $reply;
                   2175: 	close $store;
                   2176: 	my $store2=IO::File->new(">$execdir/tmp/$id.end");
                   2177: 	print $store2 "done\n";
                   2178: 	close $store2;
                   2179: 	Reply($client, "ok\n", $userinput);
                   2180:     } else {
                   2181: 	Failure($client, "error: ".($!+0)
                   2182: 		." IO::File->new Failed ".
                   2183: 		"while attempting queryreply\n", $userinput);
                   2184:     }
1.178.2.1  foxr     2185:  
                   2186: 
1.178.2.4  albertel 2187:     return 1;
1.178.2.1  foxr     2188: }
                   2189: RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0);
                   2190: #
                   2191: #  Process the courseidput query.  Not quite sure what this means
                   2192: #  at the system level sense.  It appears a gdbm file in the 
                   2193: #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
                   2194: #  a set of entries made in that database.
                   2195: #
                   2196: # Parameters:
                   2197: #   $cmd      - The command keyword that initiated this request.
                   2198: #   $tail     - Tail of the command.  In this case consists of a colon
                   2199: #               separated list contaning the domain to apply this to and
                   2200: #               an ampersand separated list of keyword=value pairs.
                   2201: #   $client   - Socket open on the client.
                   2202: # Returns:
                   2203: #   1    - indicating that processing should continue
                   2204: #
                   2205: # Side effects:
                   2206: #   reply is written to the client.
                   2207: #
                   2208: sub PutCourseIdHandler {
1.178.2.4  albertel 2209:     my $cmd    = shift;
                   2210:     my $tail   = shift;
                   2211:     my $client = shift;
1.178.2.1  foxr     2212: 
1.178.2.4  albertel 2213:     my $userinput = "$cmd:$tail";
                   2214: 
                   2215:     my ($udom,$what)=split(/:/,$tail);
                   2216:     chomp($what);
                   2217:     $udom=~s/\W//g;
                   2218:     my $proname=
                   2219: 	"$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
                   2220:     my $now=time;
                   2221:     my @pairs=split(/\&/,$what);
                   2222:     my %hash;
                   2223:     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
                   2224: 	foreach my $pair (@pairs) {
                   2225: 	    my ($key,$value)=split(/=/,$pair);
                   2226: 	    $hash{$key}=$value.':'.$now;
                   2227: 	}
                   2228: 	if (untie(%hash)) {
                   2229: 	    Reply($client, "ok\n", $userinput);
                   2230: 	} else {
                   2231: 	    Failure( $client, "error: ".($!+0)
                   2232: 		     ." untie(GDBM) Failed ".
                   2233: 		     "while attempting courseidput\n", $userinput);
                   2234: 	}
                   2235:     } else {
                   2236: 	Failure( $client, "error: ".($!+0)
                   2237: 		 ." tie(GDBM) Failed ".
                   2238: 		 "while attempting courseidput\n", $userinput);
                   2239:     }
                   2240: 
                   2241:     return 1;
1.178.2.1  foxr     2242: }
                   2243: RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0);
                   2244: 
                   2245: #  Retrieves the value of a course id resource keyword pattern
                   2246: #  defined since a starting date.  Both the starting date and the
                   2247: #  keyword pattern are optional.  If the starting date is not supplied it
                   2248: #  is treated as the beginning of time.  If the pattern is not found,
                   2249: #  it is treatred as "." matching everything.
                   2250: #
                   2251: #  Parameters:
                   2252: #     $cmd     - Command keyword that resulted in us being dispatched.
                   2253: #     $tail    - The remainder of the command that, in this case, consists
                   2254: #                of a colon separated list of:
                   2255: #                 domain   - The domain in which the course database is 
                   2256: #                            defined.
                   2257: #                 since    - Optional parameter describing the minimum
                   2258: #                            time of definition(?) of the resources that
                   2259: #                            will match the dump.
                   2260: #                 description - regular expression that is used to filter
                   2261: #                            the dump.  Only keywords matching this regexp
                   2262: #                            will be used.
                   2263: #     $client  - The socket open on the client.
                   2264: # Returns:
                   2265: #    1     - Continue processing.
                   2266: # Side Effects:
                   2267: #   a reply is written to $client.
                   2268: sub DumpCourseIdHandler {
1.178.2.4  albertel 2269:     my $cmd    = shift;
                   2270:     my $tail   = shift;
                   2271:     my $client = shift;
                   2272: 
                   2273:     my $userinput = "$cmd:$tail";
                   2274: 
                   2275:     my ($udom,$since,$description) =split(/:/,$tail);
                   2276:     if (defined($description)) {
                   2277: 	$description=&unescape($description);
                   2278:     } else {
                   2279: 	$description='.';
                   2280:     }
                   2281:     unless (defined($since)) { $since=0; }
                   2282:     my $qresult='';
                   2283:     my $proname = "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
                   2284:     my %hash;
                   2285:     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
                   2286: 	while (my ($key,$value) = each(%hash)) {
                   2287: 	    my ($descr,$lasttime)=split(/\:/,$value);
                   2288: 	    if ($lasttime<$since) { 
                   2289: 		next; 
                   2290: 	    }
                   2291: 	    if ($description eq '.') {
                   2292: 		$qresult.=$key.'='.$descr.'&';
                   2293: 	    } else {
                   2294: 		my $unescapeVal = &unescape($descr);
                   2295: 		if (eval('$unescapeVal=~/$description/i')) {
                   2296: 		    $qresult.="$key=$descr&";
                   2297: 		}
                   2298: 	    }
                   2299: 	}
                   2300: 	if (untie(%hash)) {
                   2301: 	    chop($qresult);
                   2302: 	    Reply($client, "$qresult\n", $userinput);
                   2303: 	} else {
                   2304: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2305: 		    "while attempting courseiddump\n", $userinput);
                   2306: 	}
                   2307:     } else {
                   2308: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2309: 		"while attempting courseiddump\n", $userinput);
                   2310:     }
1.178.2.1  foxr     2311: 
                   2312: 
1.178.2.4  albertel 2313:     return 1;
1.178.2.1  foxr     2314: }
                   2315: RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);
                   2316: #
                   2317: #  Puts an id to a domains id database. 
                   2318: #
                   2319: #  Parameters:
                   2320: #   $cmd     - The command that triggered us.
                   2321: #   $tail    - Remainder of the request other than the command. This is a 
                   2322: #              colon separated list containing:
                   2323: #              $domain  - The domain for which we are writing the id.
                   2324: #              $pairs  - The id info to write... this is and & separated list
                   2325: #                        of keyword=value.
                   2326: #   $client  - Socket open on the client.
                   2327: #  Returns:
                   2328: #    1   - Continue processing.
                   2329: #  Side effects:
                   2330: #     reply is written to $client.
                   2331: #
                   2332: sub PutIdHandler {
1.178.2.4  albertel 2333:     my $cmd    = shift;
                   2334:     my $tail   = shift;
                   2335:     my $client = shift;
                   2336: 
                   2337:     my $userinput = "$cmd:$tail";
                   2338: 
                   2339:     my ($udom,$what)=split(/:/,$tail);
                   2340:     chomp($what);
                   2341:     $udom=~s/\W//g;
                   2342:     my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
                   2343:     my $now=time;
                   2344:     {
                   2345: 	my $hfh;
                   2346: 	if ($hfh=IO::File->new(">>$proname.hist")) { 
                   2347: 	    print $hfh "P:$now:$what\n"; 
                   2348: 	}
                   2349:     }
                   2350:     my @pairs=split(/\&/,$what);
                   2351:     my %hash;
                   2352:     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
                   2353: 	foreach my $pair (@pairs) {
                   2354: 	    my ($key,$value)=split(/=/,$pair);
                   2355: 	    $hash{$key}=$value;
                   2356: 	}
                   2357: 	if (untie(%hash)) {
                   2358: 	    Reply($client, "ok\n", $userinput);
                   2359: 	} else {
                   2360: 	    Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2361: 		    "while attempting idput\n", $userinput);
                   2362: 	}
                   2363:     } else {
                   2364: 	Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2365: 		 "while attempting idput\n", $userinput);
1.178.2.1  foxr     2366:     }
                   2367: 
1.178.2.4  albertel 2368:     return 1;
1.178.2.1  foxr     2369: }
                   2370: 
                   2371: RegisterHandler("idput", \&PutIdHandler, 0, 1, 0);
                   2372: #
                   2373: #  Retrieves a set of id values from the id database.
                   2374: #  Returns an & separated list of results, one for each requested id to the
                   2375: #  client.
                   2376: #
                   2377: # Parameters:
                   2378: #   $cmd       - Command keyword that caused us to be dispatched.
                   2379: #   $tail      - Tail of the command.  Consists of a colon separated:
                   2380: #               domain - the domain whose id table we dump
                   2381: #               ids      Consists of an & separated list of
                   2382: #                        id keywords whose values will be fetched.
                   2383: #                        nonexisting keywords will have an empty value.
                   2384: #   $client    - Socket open on the client.
                   2385: #
                   2386: # Returns:
                   2387: #    1 - indicating processing should continue.
                   2388: # Side effects:
                   2389: #   An & separated list of results is written to $client.
                   2390: #
                   2391: sub GetIdHandler {
1.178.2.4  albertel 2392:     my $cmd    = shift;
                   2393:     my $tail   = shift;
                   2394:     my $client = shift;
                   2395: 
                   2396:     my $userinput = "$client:$tail";
                   2397: 
                   2398:     my ($udom,$what)=split(/:/,$tail);
                   2399:     chomp($what);
                   2400:     $udom=~s/\W//g;
                   2401:     my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
                   2402:     my @queries=split(/\&/,$what);
                   2403:     my $qresult='';
                   2404:     my %hash;
                   2405:     if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
                   2406: 	for (my $i=0;$i<=$#queries;$i++) {
                   2407: 	    $qresult.="$hash{$queries[$i]}&";
                   2408: 	}
                   2409: 	if (untie(%hash)) {
                   2410: 	    $qresult=~s/\&$//;
                   2411: 	    Reply($client, "$qresult\n", $userinput);
                   2412: 	} else {
                   2413: 	    Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
                   2414: 		     "while attempting idget\n",$userinput);
                   2415: 	}
                   2416:     } else {
                   2417: 	Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
                   2418: 		"while attempting idget\n",$userinput);
                   2419:     }
1.178.2.1  foxr     2420: 
1.178.2.4  albertel 2421:     return 1;
1.178.2.1  foxr     2422: }
1.178.2.3  foxr     2423: 
1.178.2.1  foxr     2424: RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);
1.178.2.3  foxr     2425: #
                   2426: #  Process the tmpput command I'm not sure what this does.. Seems to
                   2427: #  create a file in the lonDaemons/tmp directory of the form $id.tmp
                   2428: # where Id is the client's ip concatenated with a sequence number.
                   2429: # The file will contain some value that is passed in.  Is this e.g.
                   2430: # a login token?
                   2431: #
                   2432: # Parameters:
                   2433: #    $cmd     - The command that got us dispatched.
                   2434: #    $tail    - The remainder of the request following $cmd:
                   2435: #               In this case this will be the contents of the file.
                   2436: #    $client  - Socket connected to the client.
                   2437: # Returns:
                   2438: #    1 indicating processing can continue.
                   2439: # Side effects:
                   2440: #   A file is created in the local filesystem.
                   2441: #   A reply is sent to the client.
                   2442: sub TmpPutHandler {
1.178.2.4  albertel 2443:     my $cmd       = shift;
                   2444:     my $what      = shift;
                   2445:     my $client    = shift;
                   2446: 
                   2447:     my $userinput = "$cmd:$what";	# Reconstruct for logging.
                   2448: 
                   2449: 
                   2450:     my $store;
                   2451:     $tmpsnum++;
                   2452:     my $id=$$.'_'.$clientip.'_'.$tmpsnum;
                   2453:     $id=~s/\W/\_/g;
                   2454:     $what=~s/\n//g;
                   2455:     my $execdir=$perlvar{'lonDaemons'};
                   2456:     if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
                   2457: 	print $store $what;
                   2458: 	close $store;
                   2459: 	Reply($client, "$id\n", $userinput);
                   2460:     } else {
                   2461: 	Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                   2462: 		 "while attempting tmpput\n", $userinput);
                   2463:     }
                   2464:     return 1;
1.178.2.3  foxr     2465:   
                   2466: }
                   2467: RegisterHandler("tmpput", \&TmpPutHandler, 0, 1, 0);
                   2468: 
                   2469: #   Processes the tmpget command.  This command returns the contents
                   2470: #  of a temporary resource file(?) created via tmpput.
                   2471: #
                   2472: # Paramters:
                   2473: #    $cmd      - Command that got us dispatched.
                   2474: #    $id       - Tail of the command, contain the id of the resource
                   2475: #                we want to fetch.
                   2476: #    $client   - socket open on the client.
                   2477: # Return:
                   2478: #    1         - Inidcating processing can continue.
                   2479: # Side effects:
                   2480: #   A reply is sent to the client.
                   2481: 
                   2482: #
                   2483: sub TmpGetHandler {
1.178.2.4  albertel 2484:     my $cmd       = shift;
                   2485:     my $id        = shift;
                   2486:     my $client    = shift;
                   2487:     my $userinput = "$cmd:$id"; 
                   2488: 
                   2489:     chomp($id);
                   2490:     $id=~s/\W/\_/g;
                   2491:     my $store;
                   2492:     my $execdir=$perlvar{'lonDaemons'};
                   2493:     if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
                   2494: 	my $reply=<$store>;
                   2495: 	Reply( $client, "$reply\n", $userinput);
                   2496: 	close $store;
                   2497:     } else {
                   2498: 	Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
                   2499: 		 "while attempting tmpget\n", $userinput);
                   2500:     }
1.178.2.3  foxr     2501: 
1.178.2.4  albertel 2502:     return 1;
1.178.2.3  foxr     2503: }
                   2504: RegisterHandler("tmpget", \&TmpGetHandler, 0, 1, 0);
                   2505: #
                   2506: #  Process the tmpdel command.  This command deletes a temp resource
                   2507: #  created by the tmpput command.
                   2508: #
                   2509: # Parameters:
                   2510: #   $cmd      - Command that got us here.
                   2511: #   $id       - Id of the temporary resource created.
                   2512: #   $client   - socket open on the client process.
                   2513: #
                   2514: # Returns:
                   2515: #   1     - Indicating processing should continue.
                   2516: # Side Effects:
                   2517: #   A file is deleted
                   2518: #   A reply is sent to the client.
                   2519: sub TmpDelHandler {
1.178.2.4  albertel 2520:     my $cmd      = shift;
                   2521:     my $id       = shift;
                   2522:     my $client   = shift;
                   2523: 
                   2524:     my $userinput= "$cmd:$id";
1.178.2.3  foxr     2525: 
1.178.2.4  albertel 2526:     chomp($id);
                   2527:     $id=~s/\W/\_/g;
                   2528:     my $execdir=$perlvar{'lonDaemons'};
                   2529:     if (unlink("$execdir/tmp/$id.tmp")) {
                   2530: 	Reply($client, "ok\n", $userinput);
                   2531:     } else {
                   2532: 	Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
                   2533: 		 "while attempting tmpdel\n", $userinput);
                   2534:     }
                   2535: 
                   2536:     return 1;
1.178.2.3  foxr     2537: 
                   2538: }
                   2539: RegisterHandler("tmpdel", \&TmpDelHandler, 0, 1, 0);
                   2540: #
                   2541: #   ls  - list the contents of a directory.  For each file in the
                   2542: #    selected directory the filename followed by the full output of
                   2543: #    the stat function is returned.  The returned info for each
                   2544: #    file are separated by ':'.  The stat fields are separated by &'s.
                   2545: # Parameters:
                   2546: #    $cmd        - The command that dispatched us (ls).
                   2547: #    $ulsdir     - The directory path to list... I'm not sure what this
                   2548: #                  is relative as things like ls:. return e.g.
                   2549: #                  no_such_dir.
                   2550: #    $client     - Socket open on the client.
                   2551: # Returns:
                   2552: #     1 - indicating that the daemon should not disconnect.
                   2553: # Side Effects:
                   2554: #   The reply is written to  $client.
                   2555: #
                   2556: sub LsHandler {
1.178.2.4  albertel 2557:     my $cmd     = shift;
                   2558:     my $ulsdir  = shift;
                   2559:     my $client  = shift;
1.178.2.3  foxr     2560: 
1.178.2.4  albertel 2561:     my $userinput = "$cmd:$ulsdir";
1.178.2.3  foxr     2562: 
1.178.2.4  albertel 2563:     my $ulsout='';
                   2564:     my $ulsfn;
                   2565:     if (-e $ulsdir) {
                   2566: 	if(-d $ulsdir) {
                   2567: 	    if (opendir(LSDIR,$ulsdir)) {
                   2568: 		while ($ulsfn=readdir(LSDIR)) {
                   2569: 		    my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   2570: 		    $ulsout.=$ulsfn.'&'.
                   2571: 			join('&',@ulsstats).':';
                   2572: 		}
                   2573: 		closedir(LSDIR);
                   2574: 	    }
                   2575: 	} else {
                   2576: 	    my @ulsstats=stat($ulsdir);
                   2577: 	    $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   2578: 	}
                   2579:     } else {
                   2580: 	$ulsout='no_such_dir';
                   2581:     }
                   2582:     if ($ulsout eq '') { $ulsout='empty'; }
                   2583:     Reply($client, "$ulsout\n", $userinput);
                   2584: 
                   2585: 
                   2586:     return 1;
1.178.2.3  foxr     2587: }
                   2588: RegisterHandler("ls", \&LsHandler, 0, 1, 0);
                   2589: 
                   2590: 
                   2591: #
                   2592: #   Processes the setannounce command.  This command
                   2593: #   creates a file named announce.txt in the top directory of
                   2594: #   the documentn root and sets its contents.  The announce.txt file is
                   2595: #   printed in its entirety at the LonCAPA login page.  Note:
                   2596: #   once the announcement.txt fileis created it cannot be deleted.
                   2597: #   However, setting the contents of the file to empty removes the
                   2598: #   announcement from the login page of loncapa so who cares.
                   2599: #
                   2600: # Parameters:
                   2601: #    $cmd          - The command that got us dispatched.
                   2602: #    $announcement - The text of the announcement.
                   2603: #    $client       - Socket open on the client process.
                   2604: # Retunrns:
                   2605: #   1             - Indicating request processing should continue
                   2606: # Side Effects:
                   2607: #   The file {DocRoot}/announcement.txt is created.
                   2608: #   A reply is sent to $client.
                   2609: #
                   2610: sub SetAnnounceHandler {
1.178.2.4  albertel 2611:     my $cmd          = shift;
                   2612:     my $announcement = shift;
                   2613:     my $client       = shift;
1.178.2.3  foxr     2614:   
1.178.2.4  albertel 2615:     my $userinput    = "$cmd:$announcement";
1.178.2.3  foxr     2616: 
1.178.2.4  albertel 2617:     chomp($announcement);
                   2618:     $announcement=&unescape($announcement);
                   2619:     if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
                   2620: 				'/announcement.txt')) {
                   2621: 	print $store $announcement;
                   2622: 	close $store;
                   2623: 	Reply($client, "ok\n", $userinput);
                   2624:     } else {
                   2625: 	Failure($client, "error: ".($!+0)."\n", $userinput);
                   2626:     }
1.178.2.3  foxr     2627: 
1.178.2.4  albertel 2628:     return 1;
1.178.2.3  foxr     2629: }
                   2630: RegisterHandler("setannounce", \&SetAnnounceHandler, 0, 1, 0);
                   2631: 
                   2632: #
                   2633: #  Return the version of the daemon.  This can be used to determine
                   2634: #  the compatibility of cross version installations or, alternatively to
                   2635: #  simply know who's out of date and who isn't.  Note that the version
                   2636: #  is returned concatenated with the tail.
                   2637: # Parameters:
                   2638: #   $cmd        - the request that dispatched to us.
                   2639: #   $tail       - Tail of the request (client's version?).
                   2640: #   $client     - Socket open on the client.
                   2641: #Returns:
                   2642: #   1 - continue processing requests.
                   2643: # Side Effects:
                   2644: #   Replies with version to $client.
                   2645: sub GetVersionHandler {
1.178.2.4  albertel 2646:     my $client     = shift;
                   2647:     my $tail       = shift;
                   2648:     my $client     = shift;
                   2649:     my $userinput  = $client;
                   2650:     
                   2651:     Reply($client, &version($userinput)."\n", $userinput);
1.178.2.3  foxr     2652: 
                   2653: 
1.178.2.4  albertel 2654:     return 1;
1.178.2.3  foxr     2655: }
                   2656: RegisterHandler("version", \&GetVersionHandler, 0, 1, 0);
                   2657: 
                   2658: #  Set the current host and domain.  This is used to support
                   2659: #  multihomed systems.  Each IP of the system, or even separate daemons
                   2660: #  on the same IP can be treated as handling a separate lonCAPA virtual
                   2661: #  machine.  This command selects the virtual lonCAPA.  The client always
                   2662: #  knows the right one since it is lonc and it is selecting the domain/system
                   2663: #  from the hosts.tab file.
                   2664: # Parameters:
                   2665: #    $cmd      - Command that dispatched us.
                   2666: #    $tail     - Tail of the command (domain/host requested).
                   2667: #    $socket   - Socket open on the client.
                   2668: #
                   2669: # Returns:
                   2670: #     1   - Indicates the program should continue to process requests.
                   2671: # Side-effects:
                   2672: #     The default domain/system context is modified for this daemon.
                   2673: #     a reply is sent to the client.
                   2674: #
                   2675: sub SelectHostHandler {
1.178.2.4  albertel 2676:     my $cmd        = shift;
                   2677:     my $tail       = shift;
                   2678:     my $socket     = shift;
1.178.2.3  foxr     2679:   
1.178.2.4  albertel 2680:     my $userinput  ="$cmd:$tail";
1.178.2.3  foxr     2681: 
1.178.2.4  albertel 2682:     Reply($client, &sethost($userinput)."\n", $userinput);
1.178.2.3  foxr     2683: 
                   2684: 
1.178.2.4  albertel 2685:     return 1;
1.178.2.3  foxr     2686: }
                   2687: RegisterHandler("sethost", \&SelectHostHandler, 0, 1, 0);
                   2688: 
                   2689: #  Process a request to exit:
                   2690: #   - "bye" is sent to the client.
                   2691: #   - The client socket is shutdown and closed.
                   2692: #   - We indicate to the caller that we should exit.
                   2693: # Formal Parameters:
                   2694: #   $cmd                - The command that got us here.
                   2695: #   $tail               - Tail of the command (empty).
                   2696: #   $client             - Socket open on the tail.
                   2697: # Returns:
                   2698: #   0      - Indicating the program should exit!!
                   2699: #
                   2700: sub ExitHandler {
1.178.2.4  albertel 2701:     my $cmd     = shift;
                   2702:     my $tail    = shift;
                   2703:     my $client  = shift;
                   2704: 
                   2705:     my $userinput = "$cmd:$tail";
                   2706: 
                   2707:     &logthis("Client $clientip ($clientname) hanging up: $userinput");
                   2708:     Reply($client, "bye\n", $userinput);
                   2709:     $client->shutdown(2);        # shutdown the socket forcibly.
                   2710:     $client->close();
1.178.2.3  foxr     2711: 
1.178.2.4  albertel 2712:     return 0;
1.178.2.3  foxr     2713: }
                   2714: RegisterHandler("exit", \&ExitHandler, 0, 1,1);
                   2715: RegisterHandler("init", \&ExitHandler, 0, 1,1);	# RE-init is like exit.
                   2716: RegisterHandler("quit", \&ExitHandler, 0, 1,1); # I like this too!
1.178.2.1  foxr     2717: #------------------------------------------------------------------------------------
                   2718: #
                   2719: #   Process a Request.  Takes a request from the client validates
                   2720: #   it and performs the operation requested by it.  Returns
                   2721: #   a response to the client.
                   2722: #
                   2723: #  Parameters:
                   2724: #      request      - A string containing the user's request.
                   2725: #  Returns:
                   2726: #      0            - Requested to exit, caller should shut down.
                   2727: #      1            - Accept additional requests from the client.
                   2728: #
                   2729: sub ProcessRequest {
1.178.2.4  albertel 2730:     my $Request      = shift;
                   2731:     my $KeepGoing    = 1;	# Assume we're not asked to stop.
1.178.2.1  foxr     2732:     
1.178.2.4  albertel 2733:     my $wasenc=0;
                   2734:     my $userinput = $Request;   # for compatibility with oldcode <yeach>
1.178.2.1  foxr     2735: 
                   2736: 
                   2737: # ------------------------------------------------------------ See if encrypted
                   2738:    
1.178.2.4  albertel 2739:     if($userinput =~ /^enc/) {
                   2740: 	$wasenc = 1;
                   2741: 	$userinput = Decipher($userinput);
                   2742: 	if(! $userinput) {
                   2743: 	    Failure($client,"error:Encrypted data without negotiating key");
                   2744: 	    return 0;                      # Break off with this imposter.
                   2745: 	}
                   2746:     }
                   2747:     # Split off the request keyword from the rest of the stuff.
1.178.2.1  foxr     2748:    
1.178.2.4  albertel 2749:     my ($command, $tail) = split(/:/, $userinput, 2);
1.178.2.2  foxr     2750: 
1.178.2.4  albertel 2751:     Debug("Command received: $command, encoded = $wasenc");
1.178.2.2  foxr     2752: 
1.178.2.1  foxr     2753:    
                   2754: # ------------------------------------------------------------- Normal commands
                   2755: 
1.178.2.4  albertel 2756:     # 
                   2757:     #   If the command is in the hash, then execute it via the hash dispatch:
                   2758:     #
                   2759:     if(defined $Dispatcher{$command}) {
                   2760: 
                   2761: 	my $DispatchInfo = $Dispatcher{$command};
                   2762: 	my $Handler      = $$DispatchInfo[0];
                   2763: 	my $NeedEncode   = $$DispatchInfo[1];
                   2764: 	my $ClientTypes  = $$DispatchInfo[2];
                   2765: 	Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes");
1.178.2.1  foxr     2766:       
1.178.2.4  albertel 2767: 	#  Validate the request:
1.178.2.1  foxr     2768:       
1.178.2.4  albertel 2769: 	my $ok = 1;
                   2770: 	my $requesterprivs = 0;
                   2771: 	if(isClient()) {
                   2772: 	    $requesterprivs |= $CLIENT_OK;
                   2773: 	}
                   2774: 	if(isManager()) {
                   2775: 	    $requesterprivs |= $MANAGER_OK;
                   2776: 	}
                   2777: 	if($NeedEncode && (!$wasenc)) {
                   2778: 	    Debug("Must encode but wasn't: $NeedEncode $wasenc");
                   2779: 	    $ok = 0;
                   2780: 	}
                   2781: 	if(($ClientTypes & $requesterprivs) == 0) {
                   2782: 	    Debug("Client not privileged to do this operation");
                   2783: 	    $ok = 0;
                   2784: 	}
                   2785: 
                   2786: 	if($ok) {
                   2787: 	    Debug("Dispatching to handler $command $tail");
                   2788: 	    $KeepGoing = &$Handler($command, $tail, $client);
                   2789: 	} else {
                   2790: 	    Debug("Refusing to dispatch because ok is false");
                   2791: 	    Failure($client, "refused", $userinput);
                   2792: 	}
1.161     foxr     2793: 
                   2794: 
1.178.2.1  foxr     2795: # ------------------------------------------------------------- unknown command
1.97      foxr     2796: 
1.178.2.4  albertel 2797:     } else {
1.178.2.1  foxr     2798: 	# unknown command
1.178.2.4  albertel 2799: 	Failure($client, "unknown_cmd\n", $userinput);
                   2800:     }
1.97      foxr     2801: 
1.178.2.1  foxr     2802:     return $KeepGoing;
                   2803: }
1.97      foxr     2804: 
1.96      foxr     2805: 
                   2806: #
1.140     foxr     2807: #   GetCertificate: Given a transaction that requires a certificate,
                   2808: #   this function will extract the certificate from the transaction
                   2809: #   request.  Note that at this point, the only concept of a certificate
                   2810: #   is the hostname to which we are connected.
                   2811: #
                   2812: #   Parameter:
                   2813: #      request   - The request sent by our client (this parameterization may
                   2814: #                  need to change when we really use a certificate granting
                   2815: #                  authority.
                   2816: #
                   2817: sub GetCertificate {
                   2818:     my $request = shift;
                   2819: 
                   2820:     return $clientip;
                   2821: }
1.161     foxr     2822: 
                   2823: 
                   2824: 
1.156     foxr     2825: #
                   2826: #   ReadManagerTable: Reads in the current manager table. For now this is
                   2827: #                     done on each manager authentication because:
                   2828: #                     - These authentications are not frequent
                   2829: #                     - This allows dynamic changes to the manager table
                   2830: #                       without the need to signal to the lond.
                   2831: #
                   2832: 
                   2833: sub ReadManagerTable {
                   2834: 
                   2835:     #   Clean out the old table first..
                   2836: 
1.178.2.4  albertel 2837:     foreach my $key (keys %managers) {
                   2838: 	delete $managers{$key};
                   2839:     }
                   2840: 
                   2841:     my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
                   2842:     if (!open (MANAGERS, $tablename)) {
                   2843: 	logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
                   2844: 	return;
                   2845:     }
                   2846:     while(my $host = <MANAGERS>) {
                   2847: 	chomp($host);
                   2848: 	if ($host =~ "^#") {                  # Comment line.
                   2849: 	    logthis('<font color="green"> Skipping line: '. "$host</font>\n");
                   2850: 	    next;
                   2851: 	}
                   2852: 	if (!defined $hostip{$host}) { # This is a non cluster member
1.161     foxr     2853: 	    #  The entry is of the form:
                   2854: 	    #    cluname:hostname
                   2855: 	    #  cluname - A 'cluster hostname' is needed in order to negotiate
                   2856: 	    #            the host key.
                   2857: 	    #  hostname- The dns name of the host.
                   2858: 	    #
1.178.2.4  albertel 2859: 	    my($cluname, $dnsname) = split(/:/, $host);
                   2860: 	    
                   2861: 	    my $ip = gethostbyname($dnsname);
                   2862: 	    if(defined($ip)) {                 # bad names don't deserve entry.
                   2863: 		my $hostip = inet_ntoa($ip);
                   2864: 		$managers{$hostip} = $cluname;
                   2865: 		logthis('<font color="green"> registering manager '.
                   2866: 			"$dnsname as $cluname with $hostip </font>\n");
                   2867: 	    }
                   2868: 	} else {
                   2869: 	    logthis('<font color="green"> existing host'." $host</font>\n");
                   2870: 	    $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
                   2871: 	}
                   2872:     }
1.156     foxr     2873: }
1.140     foxr     2874: 
                   2875: #
                   2876: #  ValidManager: Determines if a given certificate represents a valid manager.
                   2877: #                in this primitive implementation, the 'certificate' is
                   2878: #                just the connecting loncapa client name.  This is checked
                   2879: #                against a valid client list in the configuration.
                   2880: #
                   2881: #                  
                   2882: sub ValidManager {
                   2883:     my $certificate = shift; 
                   2884: 
1.163     foxr     2885:     return isManager;
1.140     foxr     2886: }
                   2887: #
1.143     foxr     2888: #  CopyFile:  Called as part of the process of installing a 
                   2889: #             new configuration file.  This function copies an existing
                   2890: #             file to a backup file.
                   2891: # Parameters:
                   2892: #     oldfile  - Name of the file to backup.
                   2893: #     newfile  - Name of the backup file.
                   2894: # Return:
                   2895: #     0   - Failure (errno has failure reason).
                   2896: #     1   - Success.
                   2897: #
                   2898: sub CopyFile {
                   2899:     my $oldfile = shift;
                   2900:     my $newfile = shift;
                   2901: 
                   2902:     #  The file must exist:
                   2903: 
                   2904:     if(-e $oldfile) {
                   2905: 
1.178.2.4  albertel 2906: 	# Read the old file.
1.143     foxr     2907: 
                   2908: 	my $oldfh = IO::File->new("< $oldfile");
                   2909: 	if(!$oldfh) {
                   2910: 	    return 0;
                   2911: 	}
                   2912: 	my @contents = <$oldfh>;  # Suck in the entire file.
                   2913: 
                   2914: 	# write the backup file:
                   2915: 
                   2916: 	my $newfh = IO::File->new("> $newfile");
                   2917: 	if(!(defined $newfh)){
                   2918: 	    return 0;
                   2919: 	}
                   2920: 	my $lines = scalar @contents;
                   2921: 	for (my $i =0; $i < $lines; $i++) {
                   2922: 	    print $newfh ($contents[$i]);
                   2923: 	}
                   2924: 
                   2925: 	$oldfh->close;
                   2926: 	$newfh->close;
                   2927: 
                   2928: 	chmod(0660, $newfile);
                   2929: 
                   2930: 	return 1;
                   2931: 	    
                   2932:     } else {
                   2933: 	return 0;
                   2934:     }
                   2935: }
1.157     foxr     2936: #
                   2937: #  Host files are passed out with externally visible host IPs.
                   2938: #  If, for example, we are behind a fire-wall or NAT host, our 
                   2939: #  internally visible IP may be different than the externally
                   2940: #  visible IP.  Therefore, we always adjust the contents of the
                   2941: #  host file so that the entry for ME is the IP that we believe
                   2942: #  we have.  At present, this is defined as the entry that
                   2943: #  DNS has for us.  If by some chance we are not able to get a
                   2944: #  DNS translation for us, then we assume that the host.tab file
                   2945: #  is correct.  
                   2946: #    BUGBUGBUG - in the future, we really should see if we can
                   2947: #       easily query the interface(s) instead.
                   2948: # Parameter(s):
                   2949: #     contents    - The contents of the host.tab to check.
                   2950: # Returns:
                   2951: #     newcontents - The adjusted contents.
                   2952: #
                   2953: #
                   2954: sub AdjustHostContents {
                   2955:     my $contents  = shift;
                   2956:     my $adjusted;
                   2957:     my $me        = $perlvar{'lonHostID'};
                   2958: 
1.178.2.4  albertel 2959:     foreach my $line (split(/\n/,$contents)) {
1.157     foxr     2960: 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
                   2961: 	    chomp($line);
                   2962: 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
                   2963: 	    if ($id eq $me) {
1.178.2.4  albertel 2964: 		my $ip = gethostbyname($name);
                   2965: 		my $ipnew = inet_ntoa($ip);
                   2966: 		$ip = $ipnew;
1.157     foxr     2967: 		#  Reconstruct the host line and append to adjusted:
                   2968: 		
1.178.2.4  albertel 2969: 		my $newline = "$id:$domain:$role:$name:$ip";
                   2970: 		if($maxcon ne "") { # Not all hosts have loncnew tuning params
                   2971: 		    $newline .= ":$maxcon:$idleto:$mincon";
                   2972: 		}
                   2973: 		$adjusted .= $newline."\n";
1.157     foxr     2974: 		
1.178.2.4  albertel 2975: 	    } else {		# Not me, pass unmodified.
                   2976: 		$adjusted .= $line."\n";
                   2977: 	    }
1.157     foxr     2978: 	} else {                  # Blank or comment never re-written.
                   2979: 	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
                   2980: 	}
1.178.2.4  albertel 2981:     }
                   2982:     return $adjusted;
1.157     foxr     2983: }
1.143     foxr     2984: #
                   2985: #   InstallFile: Called to install an administrative file:
                   2986: #       - The file is created with <name>.tmp
                   2987: #       - The <name>.tmp file is then mv'd to <name>
                   2988: #   This lugubrious procedure is done to ensure that we are never without
                   2989: #   a valid, even if dated, version of the file regardless of who crashes
                   2990: #   and when the crash occurs.
                   2991: #
                   2992: #  Parameters:
                   2993: #       Name of the file
                   2994: #       File Contents.
                   2995: #  Return:
                   2996: #      nonzero - success.
                   2997: #      0       - failure and $! has an errno.
                   2998: #
                   2999: sub InstallFile {
                   3000:     my $Filename = shift;
                   3001:     my $Contents = shift;
                   3002:     my $TempFile = $Filename.".tmp";
                   3003: 
                   3004:     #  Open the file for write:
1.178.2.4  albertel 3005:     
1.143     foxr     3006:     my $fh = IO::File->new("> $TempFile"); # Write to temp.
                   3007:     if(!(defined $fh)) {
                   3008: 	&logthis('<font color="red"> Unable to create '.$TempFile."</font>");
                   3009: 	return 0;
                   3010:     }
                   3011:     #  write the contents of the file:
1.178.2.4  albertel 3012:     
1.143     foxr     3013:     print $fh ($Contents); 
                   3014:     $fh->close;			# In case we ever have a filesystem w. locking
                   3015: 
                   3016:     chmod(0660, $TempFile);
                   3017: 
                   3018:     # Now we can move install the file in position.
                   3019:     
                   3020:     move($TempFile, $Filename);
                   3021: 
                   3022:     return 1;
                   3023: }
1.169     foxr     3024: #
                   3025: #   ConfigFileFromSelector: converts a configuration file selector
                   3026: #                 (one of host or domain at this point) into a 
                   3027: #                 configuration file pathname.
                   3028: #
                   3029: #  Parameters:
                   3030: #      selector  - Configuration file selector.
                   3031: #  Returns:
                   3032: #      Full path to the file or undef if the selector is invalid.
                   3033: #
                   3034: sub ConfigFileFromSelector {
                   3035:     my $selector   = shift;
                   3036:     my $tablefile;
                   3037: 
                   3038:     my $tabledir = $perlvar{'lonTabDir'}.'/';
                   3039:     if ($selector eq "hosts") {
                   3040: 	$tablefile = $tabledir."hosts.tab";
                   3041:     } elsif ($selector eq "domain") {
                   3042: 	$tablefile = $tabledir."domain.tab";
                   3043:     } else {
                   3044: 	return undef;
                   3045:     }
                   3046:     return $tablefile;
1.143     foxr     3047: 
1.169     foxr     3048: }
1.143     foxr     3049: #
1.141     foxr     3050: #   PushFile:  Called to do an administrative push of a file.
                   3051: #              - Ensure the file being pushed is one we support.
                   3052: #              - Backup the old file to <filename.saved>
                   3053: #              - Separate the contents of the new file out from the
                   3054: #                rest of the request.
                   3055: #              - Write the new file.
                   3056: #  Parameter:
                   3057: #     Request - The entire user request.  This consists of a : separated
                   3058: #               string pushfile:tablename:contents.
                   3059: #     NOTE:  The contents may have :'s in it as well making things a bit
                   3060: #            more interesting... but not much.
                   3061: #  Returns:
                   3062: #     String to send to client ("ok" or "refused" if bad file).
                   3063: #
                   3064: sub PushFile {
                   3065:     my $request = shift;    
                   3066:     my ($command, $filename, $contents) = split(":", $request, 3);
                   3067:     
                   3068:     #  At this point in time, pushes for only the following tables are
                   3069:     #  supported:
                   3070:     #   hosts.tab  ($filename eq host).
                   3071:     #   domain.tab ($filename eq domain).
                   3072:     # Construct the destination filename or reject the request.
                   3073:     #
                   3074:     # lonManage is supposed to ensure this, however this session could be
                   3075:     # part of some elaborate spoof that managed somehow to authenticate.
                   3076:     #
                   3077: 
1.169     foxr     3078: 
                   3079:     my $tablefile = ConfigFileFromSelector($filename);
                   3080:     if(! (defined $tablefile)) {
1.141     foxr     3081: 	return "refused";
                   3082:     }
                   3083:     #
                   3084:     # >copy< the old table to the backup table
                   3085:     #        don't rename in case system crashes/reboots etc. in the time
                   3086:     #        window between a rename and write.
                   3087:     #
                   3088:     my $backupfile = $tablefile;
                   3089:     $backupfile    =~ s/\.tab$/.old/;
1.143     foxr     3090:     if(!CopyFile($tablefile, $backupfile)) {
                   3091: 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
                   3092: 	return "error:$!";
                   3093:     }
1.141     foxr     3094:     &logthis('<font color="green"> Pushfile: backed up '
1.178.2.4  albertel 3095: 	     .$tablefile." to $backupfile</font>");
1.141     foxr     3096:     
1.157     foxr     3097:     #  If the file being pushed is the host file, we adjust the entry for ourself so that the
                   3098:     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
                   3099:     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
                   3100:     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
                   3101:     #  that possibilty.
                   3102: 
                   3103:     if($filename eq "host") {
                   3104: 	$contents = AdjustHostContents($contents);
                   3105:     }
                   3106: 
1.141     foxr     3107:     #  Install the new file:
                   3108: 
1.143     foxr     3109:     if(!InstallFile($tablefile, $contents)) {
                   3110: 	&logthis('<font color="red"> Pushfile: unable to install '
1.178.2.4  albertel 3111: 		 .$tablefile." $! </font>");
1.143     foxr     3112: 	return "error:$!";
1.178.2.4  albertel 3113:     } else {
1.143     foxr     3114: 	&logthis('<font color="green"> Installed new '.$tablefile
                   3115: 		 ."</font>");
1.178.2.4  albertel 3116: 	
1.143     foxr     3117:     }
                   3118: 
1.141     foxr     3119: 
                   3120:     #  Indicate success:
                   3121:  
                   3122:     return "ok";
                   3123: 
                   3124: }
1.145     foxr     3125: 
                   3126: #
                   3127: #  Called to re-init either lonc or lond.
                   3128: #
                   3129: #  Parameters:
                   3130: #    request   - The full request by the client.  This is of the form
                   3131: #                reinit:<process>  
                   3132: #                where <process> is allowed to be either of 
                   3133: #                lonc or lond
                   3134: #
                   3135: #  Returns:
                   3136: #     The string to be sent back to the client either:
                   3137: #   ok         - Everything worked just fine.
                   3138: #   error:why  - There was a failure and why describes the reason.
                   3139: #
                   3140: #
                   3141: sub ReinitProcess {
                   3142:     my $request = shift;
                   3143: 
1.146     foxr     3144: 
                   3145:     # separate the request (reinit) from the process identifier and
                   3146:     # validate it producing the name of the .pid file for the process.
                   3147:     #
                   3148:     #
                   3149:     my ($junk, $process) = split(":", $request);
1.147     foxr     3150:     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146     foxr     3151:     if($process eq 'lonc') {
                   3152: 	$processpidfile = $processpidfile."lonc.pid";
1.147     foxr     3153: 	if (!open(PIDFILE, "< $processpidfile")) {
                   3154: 	    return "error:Open failed for $processpidfile";
                   3155: 	}
                   3156: 	my $loncpid = <PIDFILE>;
                   3157: 	close(PIDFILE);
                   3158: 	logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
                   3159: 		."</font>");
                   3160: 	kill("USR2", $loncpid);
1.146     foxr     3161:     } elsif ($process eq 'lond') {
1.147     foxr     3162: 	logthis('<font color="red"> Reinitializing self (lond) </font>');
                   3163: 	&UpdateHosts;			# Lond is us!!
1.146     foxr     3164:     } else {
                   3165: 	&logthis('<font color="yellow" Invalid reinit request for '.$process
                   3166: 		 ."</font>");
                   3167: 	return "error:Invalid process identifier $process";
                   3168:     }
1.145     foxr     3169:     return 'ok';
                   3170: }
1.168     foxr     3171: #   Validate a line in a configuration file edit script:
                   3172: #   Validation includes:
                   3173: #     - Ensuring the command is valid.
                   3174: #     - Ensuring the command has sufficient parameters
                   3175: #   Parameters:
                   3176: #     scriptline - A line to validate (\n has been stripped for what it's worth).
1.167     foxr     3177: #
1.168     foxr     3178: #   Return:
                   3179: #      0     - Invalid scriptline.
                   3180: #      1     - Valid scriptline
                   3181: #  NOTE:
                   3182: #     Only the command syntax is checked, not the executability of the
                   3183: #     command.
                   3184: #
                   3185: sub isValidEditCommand {
                   3186:     my $scriptline = shift;
                   3187: 
                   3188:     #   Line elements are pipe separated:
                   3189: 
                   3190:     my ($command, $key, $newline)  = split(/\|/, $scriptline);
                   3191:     &logthis('<font color="green"> isValideditCommand checking: '.
                   3192: 	     "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
                   3193:     
                   3194:     if ($command eq "delete") {
                   3195: 	#
                   3196: 	#   key with no newline.
                   3197: 	#
                   3198: 	if( ($key eq "") || ($newline ne "")) {
                   3199: 	    return 0;		# Must have key but no newline.
                   3200: 	} else {
                   3201: 	    return 1;		# Valid syntax.
                   3202: 	}
1.169     foxr     3203:     } elsif ($command eq "replace") {
1.168     foxr     3204: 	#
                   3205: 	#   key and newline:
                   3206: 	#
                   3207: 	if (($key eq "") || ($newline eq "")) {
                   3208: 	    return 0;
                   3209: 	} else {
                   3210: 	    return 1;
                   3211: 	}
1.169     foxr     3212:     } elsif ($command eq "append") {
                   3213: 	if (($key ne "") && ($newline eq "")) {
                   3214: 	    return 1;
                   3215: 	} else {
                   3216: 	    return 0;
                   3217: 	}
1.168     foxr     3218:     } else {
                   3219: 	return 0;		# Invalid command.
                   3220:     }
                   3221:     return 0;			# Should not get here!!!
                   3222: }
1.169     foxr     3223: #
                   3224: #   ApplyEdit - Applies an edit command to a line in a configuration 
                   3225: #               file.  It is the caller's responsiblity to validate the
                   3226: #               edit line.
                   3227: #   Parameters:
                   3228: #      $directive - A single edit directive to apply.  
                   3229: #                   Edit directives are of the form:
                   3230: #                  append|newline      - Appends a new line to the file.
                   3231: #                  replace|key|newline - Replaces the line with key value 'key'
                   3232: #                  delete|key          - Deletes the line with key value 'key'.
                   3233: #      $editor   - A config file editor object that contains the
                   3234: #                  file being edited.
                   3235: #
                   3236: sub ApplyEdit {
                   3237:     my $directive   = shift;
                   3238:     my $editor      = shift;
                   3239: 
                   3240:     # Break the directive down into its command and its parameters
                   3241:     # (at most two at this point.  The meaning of the parameters, if in fact
                   3242:     #  they exist depends on the command).
                   3243: 
                   3244:     my ($command, $p1, $p2) = split(/\|/, $directive);
                   3245: 
                   3246:     if($command eq "append") {
                   3247: 	$editor->Append($p1);	          # p1 - key p2 null.
                   3248:     } elsif ($command eq "replace") {
                   3249: 	$editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.
                   3250:     } elsif ($command eq "delete") {
                   3251: 	$editor->DeleteLine($p1);         # p1 - key p2 null.
                   3252:     } else {			          # Should not get here!!!
1.178.2.4  albertel 3253: 	die "Invalid command given to ApplyEdit $command";
1.169     foxr     3254:     }
                   3255: }
                   3256: #
                   3257: # AdjustOurHost:
                   3258: #           Adjusts a host file stored in a configuration file editor object
                   3259: #           for the true IP address of this host. This is necessary for hosts
                   3260: #           that live behind a firewall.
                   3261: #           Those hosts have a publicly distributed IP of the firewall, but
                   3262: #           internally must use their actual IP.  We assume that a given
                   3263: #           host only has a single IP interface for now.
                   3264: # Formal Parameters:
                   3265: #     editor   - The configuration file editor to adjust.  This
                   3266: #                editor is assumed to contain a hosts.tab file.
                   3267: # Strategy:
                   3268: #    - Figure out our hostname.
                   3269: #    - Lookup the entry for this host.
                   3270: #    - Modify the line to contain our IP
                   3271: #    - Do a replace for this host.
                   3272: sub AdjustOurHost {
                   3273:     my $editor        = shift;
                   3274: 
                   3275:     # figure out who I am.
                   3276: 
                   3277:     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.
                   3278: 
                   3279:     #  Get my host file entry.
                   3280: 
                   3281:     my $ConfigLine    = $editor->Find($myHostName);
                   3282:     if(! (defined $ConfigLine)) {
                   3283: 	die "AdjustOurHost - no entry for me in hosts file $myHostName";
                   3284:     }
                   3285:     # figure out my IP:
                   3286:     #   Use the config line to get my hostname.
                   3287:     #   Use gethostbyname to translate that into an IP address.
                   3288:     #
                   3289:     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
                   3290:     my $BinaryIp = gethostbyname($name);
                   3291:     my $ip       = inet_ntoa($ip);
                   3292:     #
                   3293:     #  Reassemble the config line from the elements in the list.
                   3294:     #  Note that if the loncnew items were not present before, they will
                   3295:     #  be now even if they would be empty
                   3296:     #
                   3297:     my $newConfigLine = $id;
                   3298:     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
                   3299: 	$newConfigLine .= ":".$item;
                   3300:     }
                   3301:     #  Replace the line:
                   3302: 
                   3303:     $editor->ReplaceLine($id, $newConfigLine);
                   3304:     
                   3305: }
                   3306: #
                   3307: #   ReplaceConfigFile:
                   3308: #              Replaces a configuration file with the contents of a
                   3309: #              configuration file editor object.
                   3310: #              This is done by:
                   3311: #              - Copying the target file to <filename>.old
                   3312: #              - Writing the new file to <filename>.tmp
                   3313: #              - Moving <filename.tmp>  -> <filename>
                   3314: #              This laborious process ensures that the system is never without
                   3315: #              a configuration file that's at least valid (even if the contents
                   3316: #              may be dated).
                   3317: #   Parameters:
                   3318: #        filename   - Name of the file to modify... this is a full path.
                   3319: #        editor     - Editor containing the file.
                   3320: #
                   3321: sub ReplaceConfigFile {
                   3322:     my $filename  = shift;
                   3323:     my $editor    = shift;
1.168     foxr     3324: 
1.169     foxr     3325:     CopyFile ($filename, $filename.".old");
                   3326: 
                   3327:     my $contents  = $editor->Get(); # Get the contents of the file.
                   3328: 
                   3329:     InstallFile($filename, $contents);
                   3330: }
1.168     foxr     3331: #   
                   3332: #
                   3333: #   Called to edit a configuration table  file
1.167     foxr     3334: #   Parameters:
                   3335: #      request           - The entire command/request sent by lonc or lonManage
                   3336: #   Return:
                   3337: #      The reply to send to the client.
1.168     foxr     3338: #
1.167     foxr     3339: sub EditFile {
                   3340:     my $request = shift;
                   3341: 
                   3342:     #  Split the command into it's pieces:  edit:filetype:script
                   3343: 
1.168     foxr     3344:     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
1.167     foxr     3345: 
                   3346:     #  Check the pre-coditions for success:
                   3347: 
                   3348:     if($request != "edit") {	# Something is amiss afoot alack.
                   3349: 	return "error:edit request detected, but request != 'edit'\n";
                   3350:     }
                   3351:     if( ($filetype ne "hosts")  &&
                   3352: 	($filetype ne "domain")) {
                   3353: 	return "error:edit requested with invalid file specifier: $filetype \n";
                   3354:     }
                   3355: 
                   3356:     #   Split the edit script and check it's validity.
1.168     foxr     3357: 
                   3358:     my @scriptlines = split(/\n/, $script);  # one line per element.
                   3359:     my $linecount   = scalar(@scriptlines);
                   3360:     for(my $i = 0; $i < $linecount; $i++) {
                   3361: 	chomp($scriptlines[$i]);
                   3362: 	if(!isValidEditCommand($scriptlines[$i])) {
                   3363: 	    return "error:edit with bad script line: '$scriptlines[$i]' \n";
                   3364: 	}
                   3365:     }
1.145     foxr     3366: 
1.167     foxr     3367:     #   Execute the edit operation.
1.169     foxr     3368:     #   - Create a config file editor for the appropriate file and 
                   3369:     #   - execute each command in the script:
                   3370:     #
                   3371:     my $configfile = ConfigFileFromSelector($filetype);
                   3372:     if (!(defined $configfile)) {
                   3373: 	return "refused\n";
                   3374:     }
                   3375:     my $editor = ConfigFileEdit->new($configfile);
1.167     foxr     3376: 
1.169     foxr     3377:     for (my $i = 0; $i < $linecount; $i++) {
                   3378: 	ApplyEdit($scriptlines[$i], $editor);
                   3379:     }
                   3380:     # If the file is the host file, ensure that our host is
                   3381:     # adjusted to have our ip:
                   3382:     #
                   3383:     if($filetype eq "host") {
                   3384: 	AdjustOurHost($editor);
                   3385:     }
                   3386:     #  Finally replace the current file with our file.
                   3387:     #
                   3388:     ReplaceConfigFile($configfile, $editor);
1.167     foxr     3389: 
                   3390:     return "ok\n";
                   3391: }
1.141     foxr     3392: #
1.96      foxr     3393: #  Convert an error return code from lcpasswd to a string value.
                   3394: #
                   3395: sub lcpasswdstrerror {
                   3396:     my $ErrorCode = shift;
1.97      foxr     3397:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96      foxr     3398: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
                   3399:     } else {
1.98      foxr     3400: 	return $passwderrors[$ErrorCode];
1.96      foxr     3401:     }
                   3402: }
                   3403: 
1.97      foxr     3404: #
                   3405: # Convert an error return code from lcuseradd to a string value:
                   3406: #
                   3407: sub lcuseraddstrerror {
                   3408:     my $ErrorCode = shift;
                   3409:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
                   3410: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
                   3411:     } else {
1.98      foxr     3412: 	return $adderrors[$ErrorCode];
1.97      foxr     3413:     }
                   3414: }
                   3415: 
1.23      harris41 3416: # grabs exception and records it to log before exiting
                   3417: sub catchexception {
1.27      albertel 3418:     my ($error)=@_;
1.25      www      3419:     $SIG{'QUIT'}='DEFAULT';
                   3420:     $SIG{__DIE__}='DEFAULT';
1.165     albertel 3421:     &status("Catching exception");
1.23      harris41 3422:     &logthis("<font color=red>CRITICAL: "
1.178.2.4  albertel 3423: 	     ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
                   3424: 	     ."a crash with this error msg->[$error]</font>");
1.57      www      3425:     &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27      albertel 3426:     if ($client) { print $client "error: $error\n"; }
1.59      www      3427:     $server->close();
1.27      albertel 3428:     die($error);
1.23      harris41 3429: }
                   3430: 
1.63      www      3431: sub timeout {
1.165     albertel 3432:     &status("Handling Timeout");
1.63      www      3433:     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
                   3434:     &catchexception('Timeout');
                   3435: }
1.22      harris41 3436: # -------------------------------- Set signal handlers to record abnormal exits
                   3437: 
                   3438: $SIG{'QUIT'}=\&catchexception;
                   3439: $SIG{__DIE__}=\&catchexception;
                   3440: 
1.81      matthew  3441: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95      harris41 3442: &status("Read loncapa.conf and loncapa_apache.conf");
                   3443: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141     foxr     3444: %perlvar=%{$perlvarref};
1.80      harris41 3445: undef $perlvarref;
1.19      www      3446: 
1.35      harris41 3447: # ----------------------------- Make sure this process is running from user=www
                   3448: my $wwwid=getpwnam('www');
                   3449: if ($wwwid!=$<) {
1.178.2.4  albertel 3450:     my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   3451:     my $subj="LON: $currenthostid User ID mismatch";
                   3452:     system("echo 'User ID mismatch.  lond must be run as user www.' |\
1.35      harris41 3453:  mailto $emailto -s '$subj' > /dev/null");
1.178.2.4  albertel 3454:     exit 1;
1.35      harris41 3455: }
                   3456: 
1.19      www      3457: # --------------------------------------------- Check if other instance running
                   3458: 
                   3459: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
                   3460: 
                   3461: if (-e $pidfile) {
1.178.2.4  albertel 3462:     my $lfh=IO::File->new("$pidfile");
                   3463:     my $pide=<$lfh>;
                   3464:     chomp($pide);
                   3465:     if (kill 0 => $pide) { die "already running"; }
1.19      www      3466: }
1.1       albertel 3467: 
                   3468: # ------------------------------------------------------------- Read hosts file
                   3469: 
                   3470: 
                   3471: 
                   3472: # establish SERVER socket, bind and listen.
                   3473: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                   3474:                                 Type      => SOCK_STREAM,
                   3475:                                 Proto     => 'tcp',
                   3476:                                 Reuse     => 1,
                   3477:                                 Listen    => 10 )
1.178.2.4  albertel 3478:     or die "making socket: $@\n";
1.1       albertel 3479: 
                   3480: # --------------------------------------------------------- Do global variables
                   3481: 
                   3482: # global variables
                   3483: 
1.134     albertel 3484: my %children               = ();       # keys are current child process IDs
1.178.2.1  foxr     3485: my $children               = 0;        # current number of children
1.1       albertel 3486: 
                   3487: sub REAPER {                        # takes care of dead children
                   3488:     $SIG{CHLD} = \&REAPER;
1.165     albertel 3489:     &status("Handling child death");
1.178.2.1  foxr     3490:     my $pid = wait;
                   3491:     if (defined($children{$pid})) {
                   3492: 	&logthis("Child $pid died");
                   3493: 	$children --;
                   3494: 	delete $children{$pid};
                   3495:     } else {
                   3496: 	&logthis("Unknown Child $pid died");
1.176     albertel 3497:     }
1.165     albertel 3498:     &status("Finished Handling child death");
1.1       albertel 3499: }
                   3500: 
                   3501: sub HUNTSMAN {                      # signal handler for SIGINT
1.165     albertel 3502:     &status("Killing children (INT)");
1.1       albertel 3503:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                   3504:     kill 'INT' => keys %children;
1.59      www      3505:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1       albertel 3506:     my $execdir=$perlvar{'lonDaemons'};
                   3507:     unlink("$execdir/logs/lond.pid");
1.9       www      3508:     &logthis("<font color=red>CRITICAL: Shutting down</font>");
1.165     albertel 3509:     &status("Done killing children");
1.1       albertel 3510:     exit;                           # clean up with dignity
                   3511: }
                   3512: 
                   3513: sub HUPSMAN {                      # signal handler for SIGHUP
                   3514:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
1.165     albertel 3515:     &status("Killing children for restart (HUP)");
1.1       albertel 3516:     kill 'INT' => keys %children;
1.59      www      3517:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.9       www      3518:     &logthis("<font color=red>CRITICAL: Restarting</font>");
1.134     albertel 3519:     my $execdir=$perlvar{'lonDaemons'};
1.30      harris41 3520:     unlink("$execdir/logs/lond.pid");
1.165     albertel 3521:     &status("Restarting self (HUP)");
1.1       albertel 3522:     exec("$execdir/lond");         # here we go again
                   3523: }
                   3524: 
1.144     foxr     3525: #
1.148     foxr     3526: #    Kill off hashes that describe the host table prior to re-reading it.
                   3527: #    Hashes affected are:
                   3528: #       %hostid, %hostdom %hostip
                   3529: #
                   3530: sub KillHostHashes {
                   3531:     foreach my $key (keys %hostid) {
                   3532: 	delete $hostid{$key};
                   3533:     }
                   3534:     foreach my $key (keys %hostdom) {
                   3535: 	delete $hostdom{$key};
                   3536:     }
                   3537:     foreach my $key (keys %hostip) {
                   3538: 	delete $hostip{$key};
                   3539:     }
                   3540: }
                   3541: #
                   3542: #   Read in the host table from file and distribute it into the various hashes:
                   3543: #
                   3544: #    - %hostid  -  Indexed by IP, the loncapa hostname.
                   3545: #    - %hostdom -  Indexed by  loncapa hostname, the domain.
                   3546: #    - %hostip  -  Indexed by hostid, the Ip address of the host.
                   3547: sub ReadHostTable {
                   3548: 
                   3549:     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
                   3550:     
                   3551:     while (my $configline=<CONFIG>) {
1.178.2.1  foxr     3552: 	my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
                   3553: 	chomp($ip); $ip=~s/\D+$//;
                   3554: 	$hostid{$ip}=$id;
                   3555: 	$hostdom{$id}=$domain;
                   3556: 	$hostip{$id}=$ip;
                   3557: 	if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
1.148     foxr     3558:     }
                   3559:     close(CONFIG);
                   3560: }
                   3561: #
                   3562: #  Reload the Apache daemon's state.
1.150     foxr     3563: #  This is done by invoking /home/httpd/perl/apachereload
                   3564: #  a setuid perl script that can be root for us to do this job.
1.148     foxr     3565: #
                   3566: sub ReloadApache {
1.150     foxr     3567:     my $execdir = $perlvar{'lonDaemons'};
                   3568:     my $script  = $execdir."/apachereload";
                   3569:     system($script);
1.148     foxr     3570: }
                   3571: 
                   3572: #
1.144     foxr     3573: #   Called in response to a USR2 signal.
                   3574: #   - Reread hosts.tab
                   3575: #   - All children connected to hosts that were removed from hosts.tab
                   3576: #     are killed via SIGINT
                   3577: #   - All children connected to previously existing hosts are sent SIGUSR1
                   3578: #   - Our internal hosts hash is updated to reflect the new contents of
                   3579: #     hosts.tab causing connections from hosts added to hosts.tab to
                   3580: #     now be honored.
                   3581: #
                   3582: sub UpdateHosts {
1.165     albertel 3583:     &status("Reload hosts.tab");
1.147     foxr     3584:     logthis('<font color="blue"> Updating connections </font>');
1.148     foxr     3585:     #
                   3586:     #  The %children hash has the set of IP's we currently have children
                   3587:     #  on.  These need to be matched against records in the hosts.tab
                   3588:     #  Any ip's no longer in the table get killed off they correspond to
                   3589:     #  either dropped or changed hosts.  Note that the re-read of the table
                   3590:     #  will take care of new and changed hosts as connections come into being.
                   3591: 
                   3592: 
                   3593:     KillHostHashes;
                   3594:     ReadHostTable;
                   3595: 
                   3596:     foreach my $child (keys %children) {
                   3597: 	my $childip = $children{$child};
                   3598: 	if(!$hostid{$childip}) {
1.149     foxr     3599: 	    logthis('<font color="blue"> UpdateHosts killing child '
                   3600: 		    ." $child for ip $childip </font>");
1.148     foxr     3601: 	    kill('INT', $child);
1.149     foxr     3602: 	} else {
                   3603: 	    logthis('<font color="green"> keeping child for ip '
                   3604: 		    ." $childip (pid=$child) </font>");
1.148     foxr     3605: 	}
                   3606:     }
                   3607:     ReloadApache;
1.165     albertel 3608:     &status("Finished reloading hosts.tab");
1.144     foxr     3609: }
                   3610: 
1.148     foxr     3611: 
1.57      www      3612: sub checkchildren {
1.165     albertel 3613:     &status("Checking on the children (sending signals)");
1.57      www      3614:     &initnewstatus();
                   3615:     &logstatus();
                   3616:     &logthis('Going to check on the children');
1.134     albertel 3617:     my $docdir=$perlvar{'lonDocRoot'};
1.61      harris41 3618:     foreach (sort keys %children) {
1.57      www      3619: 	sleep 1;
                   3620:         unless (kill 'USR1' => $_) {
                   3621: 	    &logthis ('Child '.$_.' is dead');
                   3622:             &logstatus($$.' is dead');
                   3623:         } 
1.61      harris41 3624:     }
1.63      www      3625:     sleep 5;
1.113     albertel 3626:     $SIG{ALRM} = sub { die "timeout" };
                   3627:     $SIG{__DIE__} = 'DEFAULT';
1.165     albertel 3628:     &status("Checking on the children (waiting for reports)");
1.63      www      3629:     foreach (sort keys %children) {
                   3630:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.178.2.4  albertel 3631: 	    eval {
                   3632: 		alarm(300);
                   3633: 		&logthis('Child '.$_.' did not respond');
                   3634: 		kill 9 => $_;
                   3635: 		#$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   3636: 		#$subj="LON: $currenthostid killed lond process $_";
                   3637: 		#my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
                   3638: 		#$execdir=$perlvar{'lonDaemons'};
                   3639: 		#$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
                   3640: 		alarm(0);
                   3641: 	    }
1.63      www      3642:         }
                   3643:     }
1.113     albertel 3644:     $SIG{ALRM} = 'DEFAULT';
1.155     albertel 3645:     $SIG{__DIE__} = \&catchexception;
1.165     albertel 3646:     &status("Finished checking children");
1.57      www      3647: }
                   3648: 
1.1       albertel 3649: # --------------------------------------------------------------------- Logging
                   3650: 
                   3651: sub logthis {
                   3652:     my $message=shift;
                   3653:     my $execdir=$perlvar{'lonDaemons'};
                   3654:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
                   3655:     my $now=time;
                   3656:     my $local=localtime($now);
1.58      www      3657:     $lastlog=$local.': '.$message;
1.1       albertel 3658:     print $fh "$local ($$): $message\n";
                   3659: }
                   3660: 
1.77      foxr     3661: # ------------------------- Conditional log if $DEBUG true.
                   3662: sub Debug {
                   3663:     my $message = shift;
                   3664:     if($DEBUG) {
                   3665: 	&logthis($message);
                   3666:     }
                   3667: }
1.161     foxr     3668: 
                   3669: #
                   3670: #   Sub to do replies to client.. this gives a hook for some
                   3671: #   debug tracing too:
                   3672: #  Parameters:
                   3673: #     fd      - File open on client.
                   3674: #     reply   - Text to send to client.
                   3675: #     request - Original request from client.
                   3676: #
1.178.2.1  foxr     3677: #  Note: This increments Transactions
                   3678: #
1.161     foxr     3679: sub Reply {
1.178.2.1  foxr     3680:     alarm(120);
1.161     foxr     3681:     my $fd      = shift;
                   3682:     my $reply   = shift;
                   3683:     my $request = shift;
                   3684: 
                   3685:     print $fd $reply;
                   3686:     Debug("Request was $request  Reply was $reply");
                   3687: 
1.178.2.1  foxr     3688:     $Transactions++;
                   3689:     alarm(0);
                   3690: 
                   3691: 
                   3692: }
                   3693: #
                   3694: #    Sub to report a failure.
                   3695: #    This function:
                   3696: #     -   Increments the failure statistic counters.
                   3697: #     -   Invokes Reply to send the error message to the client.
                   3698: # Parameters:
                   3699: #    fd       - File descriptor open on the client
                   3700: #    reply    - Reply text to emit.
                   3701: #    request  - The original request message (used by Reply
                   3702: #               to debug if that's enabled.
                   3703: # Implicit outputs:
                   3704: #    $Failures- The number of failures is incremented.
                   3705: #    Reply (invoked here) sends a message to the 
                   3706: #    client:
                   3707: #
                   3708: sub Failure {
1.178.2.4  albertel 3709:     my $fd      = shift;
                   3710:     my $reply   = shift;
                   3711:     my $request = shift;
1.178.2.1  foxr     3712:    
1.178.2.4  albertel 3713:     $Failures++;
                   3714:     Reply($fd, $reply, $request);      # That's simple eh?
1.161     foxr     3715: }
1.57      www      3716: # ------------------------------------------------------------------ Log status
                   3717: 
                   3718: sub logstatus {
1.178.2.4  albertel 3719:     &status("Doing logging");
                   3720:     my $docdir=$perlvar{'lonDocRoot'};
                   3721:     {
                   3722: 	my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
                   3723: 	print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";
                   3724: 	$fh->close();
                   3725:     }
                   3726:     &status("Finished londstatus.txt");
                   3727:     {
                   3728: 	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
                   3729: 	print $fh $status."\n".$lastlog."\n".time;
                   3730: 	$fh->close();
                   3731:     }
                   3732:     ResetStatistics;
                   3733:     &status("Finished logging");
1.178.2.1  foxr     3734:    
1.57      www      3735: }
                   3736: 
                   3737: sub initnewstatus {
                   3738:     my $docdir=$perlvar{'lonDocRoot'};
                   3739:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
                   3740:     my $now=time;
                   3741:     my $local=localtime($now);
                   3742:     print $fh "LOND status $local - parent $$\n\n";
1.64      www      3743:     opendir(DIR,"$docdir/lon-status/londchld");
1.134     albertel 3744:     while (my $filename=readdir(DIR)) {
1.64      www      3745:         unlink("$docdir/lon-status/londchld/$filename");
                   3746:     }
                   3747:     closedir(DIR);
1.57      www      3748: }
                   3749: 
                   3750: # -------------------------------------------------------------- Status setting
                   3751: 
                   3752: sub status {
                   3753:     my $what=shift;
                   3754:     my $now=time;
                   3755:     my $local=localtime($now);
1.178.2.1  foxr     3756:     my $status = "lond: $what $local ";
                   3757:     if($Transactions) {
1.178.2.4  albertel 3758: 	$status .= " Transactions: $Transactions Failed; $Failures";
1.178.2.1  foxr     3759:     }
                   3760:     $0=$status;
1.57      www      3761: }
1.11      www      3762: 
                   3763: # -------------------------------------------------------- Escape Special Chars
                   3764: 
                   3765: sub escape {
                   3766:     my $str=shift;
                   3767:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
                   3768:     return $str;
                   3769: }
                   3770: 
                   3771: # ----------------------------------------------------- Un-Escape Special Chars
                   3772: 
                   3773: sub unescape {
                   3774:     my $str=shift;
                   3775:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                   3776:     return $str;
                   3777: }
                   3778: 
1.1       albertel 3779: # ----------------------------------------------------------- Send USR1 to lonc
                   3780: 
                   3781: sub reconlonc {
                   3782:     my $peerfile=shift;
                   3783:     &logthis("Trying to reconnect for $peerfile");
                   3784:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
                   3785:     if (my $fh=IO::File->new("$loncfile")) {
                   3786: 	my $loncpid=<$fh>;
                   3787:         chomp($loncpid);
                   3788:         if (kill 0 => $loncpid) {
                   3789: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
                   3790:             kill USR1 => $loncpid;
                   3791:         } else {
1.178.2.4  albertel 3792: 	    &logthis("<font color=red>CRITICAL: "
                   3793: 		     ."lonc at pid $loncpid not responding, giving up</font>");
1.1       albertel 3794:         }
                   3795:     } else {
1.178.2.4  albertel 3796: 	&logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
1.1       albertel 3797:     }
                   3798: }
                   3799: 
                   3800: # -------------------------------------------------- Non-critical communication
1.11      www      3801: 
1.1       albertel 3802: sub subreply {
                   3803:     my ($cmd,$server)=@_;
                   3804:     my $peerfile="$perlvar{'lonSockDir'}/$server";
                   3805:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   3806:                                       Type    => SOCK_STREAM,
                   3807:                                       Timeout => 10)
1.178.2.4  albertel 3808: 	or return "con_lost";
1.1       albertel 3809:     print $sclient "$cmd\n";
                   3810:     my $answer=<$sclient>;
                   3811:     chomp($answer);
                   3812:     if (!$answer) { $answer="con_lost"; }
                   3813:     return $answer;
                   3814: }
                   3815: 
                   3816: sub reply {
1.178.2.4  albertel 3817:     my ($cmd,$server)=@_;
                   3818:     my $answer;
                   3819:     if ($server ne $currenthostid) { 
                   3820: 	$answer=subreply($cmd,$server);
                   3821: 	if ($answer eq 'con_lost') {
                   3822: 	    $answer=subreply("ping",$server);
                   3823: 	    if ($answer ne $server) {
                   3824: 		&logthis("sub reply: answer != server answer is $answer, server is $server");
                   3825: 		&reconlonc("$perlvar{'lonSockDir'}/$server");
                   3826: 	    }
                   3827: 	    $answer=subreply($cmd,$server);
                   3828: 	}
                   3829:     } else {
                   3830: 	$answer='self_reply';
                   3831:     } 
                   3832:     return $answer;
1.1       albertel 3833: }
                   3834: 
1.13      www      3835: # -------------------------------------------------------------- Talk to lonsql
                   3836: 
1.12      harris41 3837: sub sqlreply {
                   3838:     my ($cmd)=@_;
                   3839:     my $answer=subsqlreply($cmd);
                   3840:     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
                   3841:     return $answer;
                   3842: }
                   3843: 
                   3844: sub subsqlreply {
                   3845:     my ($cmd)=@_;
                   3846:     my $unixsock="mysqlsock";
                   3847:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
                   3848:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   3849:                                       Type    => SOCK_STREAM,
                   3850:                                       Timeout => 10)
1.178.2.4  albertel 3851: 	or return "con_lost";
1.12      harris41 3852:     print $sclient "$cmd\n";
                   3853:     my $answer=<$sclient>;
                   3854:     chomp($answer);
                   3855:     if (!$answer) { $answer="con_lost"; }
                   3856:     return $answer;
                   3857: }
                   3858: 
1.1       albertel 3859: # -------------------------------------------- Return path to profile directory
1.11      www      3860: 
1.1       albertel 3861: sub propath {
                   3862:     my ($udom,$uname)=@_;
                   3863:     $udom=~s/\W//g;
                   3864:     $uname=~s/\W//g;
1.16      www      3865:     my $subdir=$uname.'__';
1.1       albertel 3866:     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
                   3867:     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
                   3868:     return $proname;
                   3869: } 
                   3870: 
                   3871: # --------------------------------------- Is this the home server of an author?
1.11      www      3872: 
1.1       albertel 3873: sub ishome {
                   3874:     my $author=shift;
                   3875:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                   3876:     my ($udom,$uname)=split(/\//,$author);
                   3877:     my $proname=propath($udom,$uname);
                   3878:     if (-e $proname) {
                   3879: 	return 'owner';
                   3880:     } else {
                   3881:         return 'not_owner';
                   3882:     }
                   3883: }
                   3884: 
                   3885: # ======================================================= Continue main program
                   3886: # ---------------------------------------------------- Fork once and dissociate
                   3887: 
1.134     albertel 3888: my $fpid=fork;
1.1       albertel 3889: exit if $fpid;
1.29      harris41 3890: die "Couldn't fork: $!" unless defined ($fpid);
1.1       albertel 3891: 
1.29      harris41 3892: POSIX::setsid() or die "Can't start new session: $!";
1.1       albertel 3893: 
                   3894: # ------------------------------------------------------- Write our PID on disk
                   3895: 
1.134     albertel 3896: my $execdir=$perlvar{'lonDaemons'};
1.1       albertel 3897: open (PIDSAVE,">$execdir/logs/lond.pid");
                   3898: print PIDSAVE "$$\n";
                   3899: close(PIDSAVE);
1.9       www      3900: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
1.57      www      3901: &status('Starting');
1.1       albertel 3902: 
1.106     foxr     3903: 
1.1       albertel 3904: 
                   3905: # ----------------------------------------------------- Install signal handlers
                   3906: 
1.57      www      3907: 
1.1       albertel 3908: $SIG{CHLD} = \&REAPER;
                   3909: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   3910: $SIG{HUP}  = \&HUPSMAN;
1.57      www      3911: $SIG{USR1} = \&checkchildren;
1.144     foxr     3912: $SIG{USR2} = \&UpdateHosts;
1.106     foxr     3913: 
1.148     foxr     3914: #  Read the host hashes:
                   3915: 
                   3916: ReadHostTable;
1.106     foxr     3917: 
1.178.2.1  foxr     3918: 
1.106     foxr     3919: # --------------------------------------------------------------
                   3920: #   Accept connections.  When a connection comes in, it is validated
                   3921: #   and if good, a child process is created to process transactions
                   3922: #   along the connection.
                   3923: 
1.1       albertel 3924: while (1) {
1.165     albertel 3925:     &status('Starting accept');
1.106     foxr     3926:     $client = $server->accept() or next;
1.165     albertel 3927:     &status('Accepted '.$client.' off to spawn');
1.106     foxr     3928:     make_new_child($client);
1.165     albertel 3929:     &status('Finished spawning');
1.1       albertel 3930: }
                   3931: 
                   3932: sub make_new_child {
                   3933:     my $pid;
                   3934:     my $sigset;
1.106     foxr     3935: 
                   3936:     $client = shift;
1.165     albertel 3937:     &status('Starting new child '.$client);
1.161     foxr     3938:     &logthis('<font color="green"> Attempting to start child ('.$client.
                   3939: 	     ")</font>");    
1.1       albertel 3940:     # block signal for fork
                   3941:     $sigset = POSIX::SigSet->new(SIGINT);
                   3942:     sigprocmask(SIG_BLOCK, $sigset)
1.29      harris41 3943:         or die "Can't block SIGINT for fork: $!\n";
1.178.2.4  albertel 3944:     
1.29      harris41 3945:     die "fork: $!" unless defined ($pid = fork);
1.148     foxr     3946: 
                   3947:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                   3948: 	                               # connection liveness.
                   3949: 
                   3950:     #
                   3951:     #  Figure out who we're talking to so we can record the peer in 
                   3952:     #  the pid hash.
                   3953:     #
                   3954:     my $caller = getpeername($client);
                   3955:     my ($port,$iaddr)=unpack_sockaddr_in($caller);
                   3956:     $clientip=inet_ntoa($iaddr);
1.1       albertel 3957:     
                   3958:     if ($pid) {
                   3959:         # Parent records the child's birth and returns.
                   3960:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 3961:             or die "Can't unblock SIGINT for fork: $!\n";
1.148     foxr     3962:         $children{$pid} = $clientip;
1.178.2.1  foxr     3963:         $children++;
1.57      www      3964:         &status('Started child '.$pid);
1.1       albertel 3965:         return;
                   3966:     } else {
                   3967:         # Child can *not* return from this subroutine.
                   3968:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
1.126     albertel 3969:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
                   3970:                                 #don't get intercepted
1.57      www      3971:         $SIG{USR1}= \&logstatus;
1.63      www      3972:         $SIG{ALRM}= \&timeout;
1.57      www      3973:         $lastlog='Forked ';
                   3974:         $status='Forked';
                   3975: 
1.1       albertel 3976:         # unblock signals
                   3977:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 3978:             or die "Can't unblock SIGINT for fork: $!\n";
1.13      www      3979: 
1.178.2.1  foxr     3980: 
                   3981: 	
1.91      albertel 3982:         &Authen::Krb5::init_context();
                   3983:         &Authen::Krb5::init_ets();
1.178.2.4  albertel 3984: 	
1.161     foxr     3985: 	&status('Accepted connection');
1.1       albertel 3986: # =============================================================================
                   3987:             # do something with the connection
                   3988: # -----------------------------------------------------------------------------
1.148     foxr     3989: 	# see if we know client and check for spoof IP by challenge
                   3990: 
1.161     foxr     3991: 	ReadManagerTable;	# May also be a manager!!
                   3992: 	
                   3993: 	my $clientrec=($hostid{$clientip}     ne undef);
                   3994: 	my $ismanager=($managers{$clientip}    ne undef);
                   3995: 	$clientname  = "[unknonwn]";
                   3996: 	if($clientrec) {	# Establish client type.
                   3997: 	    $ConnectionType = "client";
                   3998: 	    $clientname = $hostid{$clientip};
                   3999: 	    if($ismanager) {
                   4000: 		$ConnectionType = "both";
                   4001: 	    }
                   4002: 	} else {
                   4003: 	    $ConnectionType = "manager";
                   4004: 	    $clientname = $managers{$clientip};
                   4005: 	}
                   4006: 	my $clientok;
                   4007: 	if ($clientrec || $ismanager) {
                   4008: 	    &status("Waiting for init from $clientip $clientname");
                   4009: 	    &logthis('<font color="yellow">INFO: Connection, '.
                   4010: 		     $clientip.
1.178.2.4  albertel 4011: 		     " ($clientname) connection type = $ConnectionType </font>" );
1.161     foxr     4012: 	    &status("Connecting $clientip  ($clientname))"); 
                   4013: 	    my $remotereq=<$client>;
                   4014: 	    $remotereq=~s/[^\w:]//g;
                   4015: 	    if ($remotereq =~ /^init/) {
                   4016: 		&sethost("sethost:$perlvar{'lonHostID'}");
                   4017: 		my $challenge="$$".time;
                   4018: 		print $client "$challenge\n";
1.178.2.4  albertel 4019: 		&status("Waiting for challenge reply from $clientip ($clientname)"); 
1.161     foxr     4020: 		$remotereq=<$client>;
                   4021: 		$remotereq=~s/\W//g;
                   4022: 		if ($challenge eq $remotereq) {
                   4023: 		    $clientok=1;
                   4024: 		    print $client "ok\n";
                   4025: 		} else {
1.178.2.4  albertel 4026: 		    &logthis("<font color=blue>WARNING: $clientip did not reply challenge</font>");
1.161     foxr     4027: 		    &status('No challenge reply '.$clientip);
                   4028: 		}
1.2       www      4029: 	    } else {
1.178.2.4  albertel 4030: 		&logthis("<font color=blue>WARNING: "
1.161     foxr     4031: 			 ."$clientip failed to initialize: >$remotereq< </font>");
                   4032: 		&status('No init '.$clientip);
                   4033: 	    }
                   4034: 	} else {
1.178.2.4  albertel 4035: 	    &logthis("<font color=blue>WARNING: Unknown client $clientip</font>");
1.161     foxr     4036: 	    &status('Hung up on '.$clientip);
                   4037: 	}
                   4038: 	if ($clientok) {
1.1       albertel 4039: # ---------------- New known client connecting, could mean machine online again
1.161     foxr     4040: 	    
                   4041: 	    foreach my $id (keys(%hostip)) {
                   4042: 		if ($hostip{$id} ne $clientip ||
                   4043: 		    $hostip{$currenthostid} eq $clientip) {
                   4044: 		    # no need to try to do recon's to myself
                   4045: 		    next;
1.115     albertel 4046: 		}
1.161     foxr     4047: 		&reconlonc("$perlvar{'lonSockDir'}/$id");
                   4048: 	    }
                   4049: 	    &logthis("<font color=green>Established connection: $clientname</font>");
                   4050: 	    &status('Will listen to '.$clientname);
                   4051: 
1.178.2.1  foxr     4052: 	    ResetStatistics();
1.161     foxr     4053: 
1.178.2.1  foxr     4054: # ------------------------------------------------------------ Process requests
                   4055: 	    my $KeepGoing = 1;
                   4056: 	    while ((my $userinput=GetRequest) && $KeepGoing) {
                   4057: 		$KeepGoing = ProcessRequest($userinput);
1.177     foxr     4058: # -------------------------------------------------------------------- complete
1.178.2.1  foxr     4059: 
1.161     foxr     4060: 		&status('Listening to '.$clientname);
                   4061: 	    }
1.59      www      4062: # --------------------------------------------- client unknown or fishy, refuse
1.161     foxr     4063: 	} else {
                   4064: 	    print $client "refused\n";
                   4065: 	    $client->close();
                   4066: 	    &logthis("<font color=blue>WARNING: "
                   4067: 		     ."Rejected client $clientip, closing connection</font>");
                   4068: 	}
                   4069:     }             
                   4070:     
1.1       albertel 4071: # =============================================================================
1.161     foxr     4072:     
                   4073:     &logthis("<font color=red>CRITICAL: "
                   4074: 	     ."Disconnect from $clientip ($clientname)</font>");    
                   4075:     
                   4076:     
                   4077:     # this exit is VERY important, otherwise the child will become
                   4078:     # a producer of more and more children, forking yourself into
                   4079:     # process death.
                   4080:     exit;
1.106     foxr     4081:     
1.78      foxr     4082: }
                   4083: 
                   4084: 
                   4085: #
                   4086: #   Checks to see if the input roleput request was to set
                   4087: # an author role.  If so, invokes the lchtmldir script to set
                   4088: # up a correct public_html 
                   4089: # Parameters:
                   4090: #    request   - The request sent to the rolesput subchunk.
                   4091: #                We're looking for  /domain/_au
                   4092: #    domain    - The domain in which the user is having roles doctored.
                   4093: #    user      - Name of the user for which the role is being put.
                   4094: #    authtype  - The authentication type associated with the user.
                   4095: #
1.178.2.4  albertel 4096: sub ManagePermissions {
1.78      foxr     4097:     my $request = shift;
                   4098:     my $domain  = shift;
                   4099:     my $user    = shift;
                   4100:     my $authtype= shift;
                   4101: 
                   4102:     # See if the request is of the form /$domain/_au
1.178.2.1  foxr     4103:     &logthis("ruequest is $request");
1.78      foxr     4104:     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
                   4105: 	my $execdir = $perlvar{'lonDaemons'};
                   4106: 	my $userhome= "/home/$user" ;
1.134     albertel 4107: 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.78      foxr     4108: 	system("$execdir/lchtmldir $userhome $user $authtype");
                   4109:     }
                   4110: }
                   4111: #
                   4112: #   GetAuthType - Determines the authorization type of a user in a domain.
                   4113: 
                   4114: #     Returns the authorization type or nouser if there is no such user.
                   4115: #
1.178.2.4  albertel 4116: sub GetAuthType {
1.78      foxr     4117:     my $domain = shift;
                   4118:     my $user   = shift;
                   4119: 
1.79      foxr     4120:     Debug("GetAuthType( $domain, $user ) \n");
1.78      foxr     4121:     my $proname    = &propath($domain, $user); 
                   4122:     my $passwdfile = "$proname/passwd";
                   4123:     if( -e $passwdfile ) {
                   4124: 	my $pf = IO::File->new($passwdfile);
                   4125: 	my $realpassword = <$pf>;
                   4126: 	chomp($realpassword);
1.79      foxr     4127: 	Debug("Password info = $realpassword\n");
1.78      foxr     4128: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79      foxr     4129: 	Debug("Authtype = $authtype, content = $contentpwd\n");
1.78      foxr     4130: 	my $availinfo = '';
1.91      albertel 4131: 	if($authtype eq 'krb4' or $authtype eq 'krb5') {
1.78      foxr     4132: 	    $availinfo = $contentpwd;
                   4133: 	}
1.79      foxr     4134: 
1.78      foxr     4135: 	return "$authtype:$availinfo";
1.178.2.4  albertel 4136:     } else {
1.79      foxr     4137: 	Debug("Returning nouser");
1.78      foxr     4138: 	return "nouser";
                   4139:     }
1.1       albertel 4140: }
                   4141: 
1.84      albertel 4142: sub addline {
                   4143:     my ($fname,$hostid,$ip,$newline)=@_;
                   4144:     my $contents;
                   4145:     my $found=0;
                   4146:     my $expr='^'.$hostid.':'.$ip.':';
                   4147:     $expr =~ s/\./\\\./g;
1.134     albertel 4148:     my $sh;
1.84      albertel 4149:     if ($sh=IO::File->new("$fname.subscription")) {
                   4150: 	while (my $subline=<$sh>) {
                   4151: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
                   4152: 	}
                   4153: 	$sh->close();
                   4154:     }
                   4155:     $sh=IO::File->new(">$fname.subscription");
                   4156:     if ($contents) { print $sh $contents; }
                   4157:     if ($newline) { print $sh $newline; }
                   4158:     $sh->close();
                   4159:     return $found;
1.86      www      4160: }
                   4161: 
                   4162: sub getchat {
1.122     www      4163:     my ($cdom,$cname,$udom,$uname)=@_;
1.87      www      4164:     my %hash;
                   4165:     my $proname=&propath($cdom,$cname);
                   4166:     my @entries=();
1.88      albertel 4167:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   4168: 	    &GDBM_READER(),0640)) {
                   4169: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   4170: 	untie %hash;
1.123     www      4171:     }
1.124     www      4172:     my @participants=();
1.134     albertel 4173:     my $cutoff=time-60;
1.123     www      4174:     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
1.124     www      4175: 	    &GDBM_WRCREAT(),0640)) {
                   4176:         $hash{$uname.':'.$udom}=time;
1.123     www      4177:         foreach (sort keys %hash) {
                   4178: 	    if ($hash{$_}>$cutoff) {
1.124     www      4179: 		$participants[$#participants+1]='active_participant:'.$_;
1.123     www      4180:             }
                   4181:         }
                   4182:         untie %hash;
1.86      www      4183:     }
1.124     www      4184:     return (@participants,@entries);
1.86      www      4185: }
                   4186: 
                   4187: sub chatadd {
1.88      albertel 4188:     my ($cdom,$cname,$newchat)=@_;
                   4189:     my %hash;
                   4190:     my $proname=&propath($cdom,$cname);
                   4191:     my @entries=();
1.142     www      4192:     my $time=time;
1.88      albertel 4193:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   4194: 	    &GDBM_WRCREAT(),0640)) {
                   4195: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   4196: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
                   4197: 	my ($thentime,$idnum)=split(/\_/,$lastid);
                   4198: 	my $newid=$time.'_000000';
                   4199: 	if ($thentime==$time) {
                   4200: 	    $idnum=~s/^0+//;
                   4201: 	    $idnum++;
                   4202: 	    $idnum=substr('000000'.$idnum,-6,6);
                   4203: 	    $newid=$time.'_'.$idnum;
                   4204: 	}
                   4205: 	$hash{$newid}=$newchat;
                   4206: 	my $expired=$time-3600;
                   4207: 	foreach (keys %hash) {
                   4208: 	    my ($thistime)=($_=~/(\d+)\_/);
                   4209: 	    if ($thistime<$expired) {
1.89      www      4210: 		delete $hash{$_};
1.88      albertel 4211: 	    }
                   4212: 	}
                   4213: 	untie %hash;
1.142     www      4214:     }
                   4215:     {
                   4216: 	my $hfh;
                   4217: 	if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 
                   4218: 	    print $hfh "$time:".&unescape($newchat)."\n";
                   4219: 	}
1.86      www      4220:     }
1.84      albertel 4221: }
                   4222: 
                   4223: sub unsub {
                   4224:     my ($fname,$clientip)=@_;
                   4225:     my $result;
1.161     foxr     4226:     if (unlink("$fname.$clientname")) {
1.84      albertel 4227: 	$result="ok\n";
                   4228:     } else {
                   4229: 	$result="not_subscribed\n";
                   4230:     }
                   4231:     if (-e "$fname.subscription") {
1.161     foxr     4232: 	my $found=&addline($fname,$clientname,$clientip,'');
1.84      albertel 4233: 	if ($found) { $result="ok\n"; }
                   4234:     } else {
                   4235: 	if ($result != "ok\n") { $result="not_subscribed\n"; }
                   4236:     }
                   4237:     return $result;
                   4238: }
                   4239: 
1.101     www      4240: sub currentversion {
                   4241:     my $fname=shift;
                   4242:     my $version=-1;
                   4243:     my $ulsdir='';
                   4244:     if ($fname=~/^(.+)\/[^\/]+$/) {
1.178.2.4  albertel 4245: 	$ulsdir=$1;
1.101     www      4246:     }
1.114     albertel 4247:     my ($fnamere1,$fnamere2);
                   4248:     # remove version if already specified
1.101     www      4249:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114     albertel 4250:     # get the bits that go before and after the version number
                   4251:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
                   4252: 	$fnamere1=$1;
                   4253: 	$fnamere2='.'.$2;
                   4254:     }
1.101     www      4255:     if (-e $fname) { $version=1; }
                   4256:     if (-e $ulsdir) {
1.134     albertel 4257: 	if(-d $ulsdir) {
                   4258: 	    if (opendir(LSDIR,$ulsdir)) {
                   4259: 		my $ulsfn;
                   4260: 		while ($ulsfn=readdir(LSDIR)) {
1.101     www      4261: # see if this is a regular file (ignore links produced earlier)
1.134     albertel 4262: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
                   4263: 		    unless (-l $thisfile) {
1.160     www      4264: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134     albertel 4265: 			    if ($1>$version) { $version=$1; }
                   4266: 			}
                   4267: 		    }
                   4268: 		}
                   4269: 		closedir(LSDIR);
                   4270: 		$version++;
                   4271: 	    }
                   4272: 	}
                   4273:     }
                   4274:     return $version;
1.101     www      4275: }
                   4276: 
                   4277: sub thisversion {
                   4278:     my $fname=shift;
                   4279:     my $version=-1;
                   4280:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
                   4281: 	$version=$1;
                   4282:     }
                   4283:     return $version;
                   4284: }
                   4285: 
1.84      albertel 4286: sub subscribe {
                   4287:     my ($userinput,$clientip)=@_;
                   4288:     my $result;
                   4289:     my ($cmd,$fname)=split(/:/,$userinput);
                   4290:     my $ownership=&ishome($fname);
                   4291:     if ($ownership eq 'owner') {
1.101     www      4292: # explitly asking for the current version?
                   4293:         unless (-e $fname) {
                   4294:             my $currentversion=&currentversion($fname);
                   4295: 	    if (&thisversion($fname)==$currentversion) {
                   4296:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
                   4297: 		    my $root=$1;
                   4298:                     my $extension=$2;
                   4299:                     symlink($root.'.'.$extension,
                   4300:                             $root.'.'.$currentversion.'.'.$extension);
1.102     www      4301:                     unless ($extension=~/\.meta$/) {
1.178.2.4  albertel 4302: 			symlink($root.'.'.$extension.'.meta',
                   4303: 				$root.'.'.$currentversion.'.'.$extension.'.meta');
1.102     www      4304: 		    }
1.101     www      4305:                 }
                   4306:             }
                   4307:         }
1.84      albertel 4308: 	if (-e $fname) {
                   4309: 	    if (-d $fname) {
                   4310: 		$result="directory\n";
                   4311: 	    } else {
1.161     foxr     4312: 		if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134     albertel 4313: 		my $now=time;
1.161     foxr     4314: 		my $found=&addline($fname,$clientname,$clientip,
                   4315: 				   "$clientname:$clientip:$now\n");
1.84      albertel 4316: 		if ($found) { $result="$fname\n"; }
                   4317: 		# if they were subscribed to only meta data, delete that
                   4318:                 # subscription, when you subscribe to a file you also get
                   4319:                 # the metadata
                   4320: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
                   4321: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
                   4322: 		$fname="http://$thisserver/".$fname;
                   4323: 		$result="$fname\n";
                   4324: 	    }
                   4325: 	} else {
                   4326: 	    $result="not_found\n";
                   4327: 	}
                   4328:     } else {
                   4329: 	$result="rejected\n";
                   4330:     }
                   4331:     return $result;
                   4332: }
1.91      albertel 4333: 
                   4334: sub make_passwd_file {
1.98      foxr     4335:     my ($uname, $umode,$npass,$passfilename)=@_;
1.91      albertel 4336:     my $result="ok\n";
                   4337:     if ($umode eq 'krb4' or $umode eq 'krb5') {
                   4338: 	{
                   4339: 	    my $pf = IO::File->new(">$passfilename");
                   4340: 	    print $pf "$umode:$npass\n";
                   4341: 	}
                   4342:     } elsif ($umode eq 'internal') {
                   4343: 	my $salt=time;
                   4344: 	$salt=substr($salt,6,2);
                   4345: 	my $ncpass=crypt($npass,$salt);
                   4346: 	{
                   4347: 	    &Debug("Creating internal auth");
                   4348: 	    my $pf = IO::File->new(">$passfilename");
                   4349: 	    print $pf "internal:$ncpass\n"; 
                   4350: 	}
                   4351:     } elsif ($umode eq 'localauth') {
                   4352: 	{
                   4353: 	    my $pf = IO::File->new(">$passfilename");
                   4354: 	    print $pf "localauth:$npass\n";
                   4355: 	}
                   4356:     } elsif ($umode eq 'unix') {
                   4357: 	{
                   4358: 	    my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
                   4359: 	    {
                   4360: 		&Debug("Executing external: ".$execpath);
1.98      foxr     4361: 		&Debug("user  = ".$uname.", Password =". $npass);
1.132     matthew  4362: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91      albertel 4363: 		print $se "$uname\n";
                   4364: 		print $se "$npass\n";
                   4365: 		print $se "$npass\n";
1.97      foxr     4366: 	    }
                   4367: 	    my $useraddok = $?;
                   4368: 	    if($useraddok > 0) {
                   4369: 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
1.91      albertel 4370: 	    }
                   4371: 	    my $pf = IO::File->new(">$passfilename");
                   4372: 	    print $pf "unix:\n";
                   4373: 	}
                   4374:     } elsif ($umode eq 'none') {
                   4375: 	{
                   4376: 	    my $pf = IO::File->new(">$passfilename");
                   4377: 	    print $pf "none:\n";
                   4378: 	}
                   4379:     } else {
                   4380: 	$result="auth_mode_error\n";
                   4381:     }
                   4382:     return $result;
1.121     albertel 4383: }
                   4384: 
                   4385: sub sethost {
                   4386:     my ($remotereq) = @_;
                   4387:     my (undef,$hostid)=split(/:/,$remotereq);
                   4388:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
                   4389:     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
                   4390: 	$currenthostid=$hostid;
                   4391: 	$currentdomainid=$hostdom{$hostid};
                   4392: 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
                   4393:     } else {
                   4394: 	&logthis("Requested host id $hostid not an alias of ".
                   4395: 		 $perlvar{'lonHostID'}." refusing connection");
                   4396: 	return 'unable_to_set';
                   4397:     }
                   4398:     return 'ok';
                   4399: }
                   4400: 
                   4401: sub version {
                   4402:     my ($userinput)=@_;
                   4403:     $remoteVERSION=(split(/:/,$userinput))[1];
                   4404:     return "version:$VERSION";
1.127     albertel 4405: }
1.178.2.1  foxr     4406: ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<<
1.128     albertel 4407: #There is a copy of this in lonnet.pm
1.178.2.1  foxr     4408: #   Can we hoist these lil' things out into common places?
                   4409: #
1.127     albertel 4410: sub userload {
                   4411:     my $numusers=0;
                   4412:     {
                   4413: 	opendir(LONIDS,$perlvar{'lonIDsDir'});
                   4414: 	my $filename;
                   4415: 	my $curtime=time;
                   4416: 	while ($filename=readdir(LONIDS)) {
                   4417: 	    if ($filename eq '.' || $filename eq '..') {next;}
1.138     albertel 4418: 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159     albertel 4419: 	    if ($curtime-$mtime < 1800) { $numusers++; }
1.127     albertel 4420: 	}
                   4421: 	closedir(LONIDS);
                   4422:     }
                   4423:     my $userloadpercent=0;
                   4424:     my $maxuserload=$perlvar{'lonUserLoadLim'};
                   4425:     if ($maxuserload) {
1.129     albertel 4426: 	$userloadpercent=100*$numusers/$maxuserload;
1.127     albertel 4427:     }
1.130     albertel 4428:     $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127     albertel 4429:     return $userloadpercent;
1.91      albertel 4430: }
                   4431: 
1.61      harris41 4432: # ----------------------------------- POD (plain old documentation, CPAN style)
                   4433: 
                   4434: =head1 NAME
                   4435: 
                   4436: lond - "LON Daemon" Server (port "LOND" 5663)
                   4437: 
                   4438: =head1 SYNOPSIS
                   4439: 
1.74      harris41 4440: Usage: B<lond>
                   4441: 
                   4442: Should only be run as user=www.  This is a command-line script which
                   4443: is invoked by B<loncron>.  There is no expectation that a typical user
                   4444: will manually start B<lond> from the command-line.  (In other words,
                   4445: DO NOT START B<lond> YOURSELF.)
1.61      harris41 4446: 
                   4447: =head1 DESCRIPTION
                   4448: 
1.74      harris41 4449: There are two characteristics associated with the running of B<lond>,
                   4450: PROCESS MANAGEMENT (starting, stopping, handling child processes)
                   4451: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
                   4452: subscriptions, etc).  These are described in two large
                   4453: sections below.
                   4454: 
                   4455: B<PROCESS MANAGEMENT>
                   4456: 
1.61      harris41 4457: Preforker - server who forks first. Runs as a daemon. HUPs.
                   4458: Uses IDEA encryption
                   4459: 
1.74      harris41 4460: B<lond> forks off children processes that correspond to the other servers
                   4461: in the network.  Management of these processes can be done at the
                   4462: parent process level or the child process level.
                   4463: 
                   4464: B<logs/lond.log> is the location of log messages.
                   4465: 
                   4466: The process management is now explained in terms of linux shell commands,
                   4467: subroutines internal to this code, and signal assignments:
                   4468: 
                   4469: =over 4
                   4470: 
                   4471: =item *
                   4472: 
                   4473: PID is stored in B<logs/lond.pid>
                   4474: 
                   4475: This is the process id number of the parent B<lond> process.
                   4476: 
                   4477: =item *
                   4478: 
                   4479: SIGTERM and SIGINT
                   4480: 
                   4481: Parent signal assignment:
                   4482:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   4483: 
                   4484: Child signal assignment:
                   4485:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
                   4486: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
                   4487:  to restart a new child.)
                   4488: 
                   4489: Command-line invocations:
                   4490:  B<kill> B<-s> SIGTERM I<PID>
                   4491:  B<kill> B<-s> SIGINT I<PID>
                   4492: 
                   4493: Subroutine B<HUNTSMAN>:
                   4494:  This is only invoked for the B<lond> parent I<PID>.
                   4495: This kills all the children, and then the parent.
                   4496: The B<lonc.pid> file is cleared.
                   4497: 
                   4498: =item *
                   4499: 
                   4500: SIGHUP
                   4501: 
                   4502: Current bug:
                   4503:  This signal can only be processed the first time
                   4504: on the parent process.  Subsequent SIGHUP signals
                   4505: have no effect.
                   4506: 
                   4507: Parent signal assignment:
                   4508:  $SIG{HUP}  = \&HUPSMAN;
                   4509: 
                   4510: Child signal assignment:
                   4511:  none (nothing happens)
                   4512: 
                   4513: Command-line invocations:
                   4514:  B<kill> B<-s> SIGHUP I<PID>
                   4515: 
                   4516: Subroutine B<HUPSMAN>:
                   4517:  This is only invoked for the B<lond> parent I<PID>,
                   4518: This kills all the children, and then the parent.
                   4519: The B<lond.pid> file is cleared.
                   4520: 
                   4521: =item *
                   4522: 
                   4523: SIGUSR1
                   4524: 
                   4525: Parent signal assignment:
                   4526:  $SIG{USR1} = \&USRMAN;
                   4527: 
                   4528: Child signal assignment:
                   4529:  $SIG{USR1}= \&logstatus;
                   4530: 
                   4531: Command-line invocations:
                   4532:  B<kill> B<-s> SIGUSR1 I<PID>
                   4533: 
                   4534: Subroutine B<USRMAN>:
                   4535:  When invoked for the B<lond> parent I<PID>,
                   4536: SIGUSR1 is sent to all the children, and the status of
                   4537: each connection is logged.
1.144     foxr     4538: 
                   4539: =item *
                   4540: 
                   4541: SIGUSR2
                   4542: 
                   4543: Parent Signal assignment:
                   4544:     $SIG{USR2} = \&UpdateHosts
                   4545: 
                   4546: Child signal assignment:
                   4547:     NONE
                   4548: 
1.74      harris41 4549: 
                   4550: =item *
                   4551: 
                   4552: SIGCHLD
                   4553: 
                   4554: Parent signal assignment:
                   4555:  $SIG{CHLD} = \&REAPER;
                   4556: 
                   4557: Child signal assignment:
                   4558:  none
                   4559: 
                   4560: Command-line invocations:
                   4561:  B<kill> B<-s> SIGCHLD I<PID>
                   4562: 
                   4563: Subroutine B<REAPER>:
                   4564:  This is only invoked for the B<lond> parent I<PID>.
                   4565: Information pertaining to the child is removed.
                   4566: The socket port is cleaned up.
                   4567: 
                   4568: =back
                   4569: 
                   4570: B<SERVER-SIDE ACTIVITIES>
                   4571: 
                   4572: Server-side information can be accepted in an encrypted or non-encrypted
                   4573: method.
                   4574: 
                   4575: =over 4
                   4576: 
                   4577: =item ping
                   4578: 
                   4579: Query a client in the hosts.tab table; "Are you there?"
                   4580: 
                   4581: =item pong
                   4582: 
                   4583: Respond to a ping query.
                   4584: 
                   4585: =item ekey
                   4586: 
                   4587: Read in encrypted key, make cipher.  Respond with a buildkey.
                   4588: 
                   4589: =item load
                   4590: 
                   4591: Respond with CPU load based on a computation upon /proc/loadavg.
                   4592: 
                   4593: =item currentauth
                   4594: 
                   4595: Reply with current authentication information (only over an
                   4596: encrypted channel).
                   4597: 
                   4598: =item auth
                   4599: 
                   4600: Only over an encrypted channel, reply as to whether a user's
                   4601: authentication information can be validated.
                   4602: 
                   4603: =item passwd
                   4604: 
                   4605: Allow for a password to be set.
                   4606: 
                   4607: =item makeuser
                   4608: 
                   4609: Make a user.
                   4610: 
                   4611: =item passwd
                   4612: 
                   4613: Allow for authentication mechanism and password to be changed.
                   4614: 
                   4615: =item home
1.61      harris41 4616: 
1.74      harris41 4617: Respond to a question "are you the home for a given user?"
                   4618: 
                   4619: =item update
                   4620: 
                   4621: Update contents of a subscribed resource.
                   4622: 
                   4623: =item unsubscribe
                   4624: 
                   4625: The server is unsubscribing from a resource.
                   4626: 
                   4627: =item subscribe
                   4628: 
                   4629: The server is subscribing to a resource.
                   4630: 
                   4631: =item log
                   4632: 
                   4633: Place in B<logs/lond.log>
                   4634: 
                   4635: =item put
                   4636: 
                   4637: stores hash in namespace
                   4638: 
                   4639: =item rolesput
                   4640: 
                   4641: put a role into a user's environment
                   4642: 
                   4643: =item get
                   4644: 
                   4645: returns hash with keys from array
                   4646: reference filled in from namespace
                   4647: 
                   4648: =item eget
                   4649: 
                   4650: returns hash with keys from array
                   4651: reference filled in from namesp (encrypts the return communication)
                   4652: 
                   4653: =item rolesget
                   4654: 
                   4655: get a role from a user's environment
                   4656: 
                   4657: =item del
                   4658: 
                   4659: deletes keys out of array from namespace
                   4660: 
                   4661: =item keys
                   4662: 
                   4663: returns namespace keys
                   4664: 
                   4665: =item dump
                   4666: 
                   4667: dumps the complete (or key matching regexp) namespace into a hash
                   4668: 
                   4669: =item store
                   4670: 
                   4671: stores hash permanently
                   4672: for this url; hashref needs to be given and should be a \%hashname; the
                   4673: remaining args aren't required and if they aren't passed or are '' they will
                   4674: be derived from the ENV
                   4675: 
                   4676: =item restore
                   4677: 
                   4678: returns a hash for a given url
                   4679: 
                   4680: =item querysend
                   4681: 
                   4682: Tells client about the lonsql process that has been launched in response
                   4683: to a sent query.
                   4684: 
                   4685: =item queryreply
                   4686: 
                   4687: Accept information from lonsql and make appropriate storage in temporary
                   4688: file space.
                   4689: 
                   4690: =item idput
                   4691: 
                   4692: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
                   4693: for each student, defined perhaps by the institutional Registrar.)
                   4694: 
                   4695: =item idget
                   4696: 
                   4697: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
                   4698: for each student, defined perhaps by the institutional Registrar.)
                   4699: 
                   4700: =item tmpput
                   4701: 
                   4702: Accept and store information in temporary space.
                   4703: 
                   4704: =item tmpget
                   4705: 
                   4706: Send along temporarily stored information.
                   4707: 
                   4708: =item ls
                   4709: 
                   4710: List part of a user's directory.
                   4711: 
1.135     foxr     4712: =item pushtable
                   4713: 
                   4714: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
                   4715: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
                   4716: must be restored manually in case of a problem with the new table file.
                   4717: pushtable requires that the request be encrypted and validated via
                   4718: ValidateManager.  The form of the command is:
                   4719: enc:pushtable tablename <tablecontents> \n
                   4720: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
                   4721: cleartext newline.
                   4722: 
1.74      harris41 4723: =item Hanging up (exit or init)
                   4724: 
                   4725: What to do when a client tells the server that they (the client)
                   4726: are leaving the network.
                   4727: 
                   4728: =item unknown command
                   4729: 
                   4730: If B<lond> is sent an unknown command (not in the list above),
                   4731: it replys to the client "unknown_cmd".
1.135     foxr     4732: 
1.74      harris41 4733: 
                   4734: =item UNKNOWN CLIENT
                   4735: 
                   4736: If the anti-spoofing algorithm cannot verify the client,
                   4737: the client is rejected (with a "refused" message sent
                   4738: to the client, and the connection is closed.
                   4739: 
                   4740: =back
1.61      harris41 4741: 
                   4742: =head1 PREREQUISITES
                   4743: 
                   4744: IO::Socket
                   4745: IO::File
                   4746: Apache::File
                   4747: Symbol
                   4748: POSIX
                   4749: Crypt::IDEA
                   4750: LWP::UserAgent()
                   4751: GDBM_File
                   4752: Authen::Krb4
1.91      albertel 4753: Authen::Krb5
1.61      harris41 4754: 
                   4755: =head1 COREQUISITES
                   4756: 
                   4757: =head1 OSNAMES
                   4758: 
                   4759: linux
                   4760: 
                   4761: =head1 SCRIPT CATEGORIES
                   4762: 
                   4763: Server/Process
                   4764: 
                   4765: =cut

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