Annotation of loncom/lond, revision 1.178.2.1

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network
                      3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60      www         4: #
1.178.2.1! foxr        5: # $Id: lond,v 1.169 2003/12/30 11:28:16 foxr Exp $
1.60      www         6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
1.167     foxr       13: # the Free Software Foundation; either version 2 of the License, or 
1.60      www        14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
1.178.2.1! foxr       23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA    
1.60      www        24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
1.161     foxr       27: 
                     28: 
1.60      www        29: # http://www.lon-capa.org/
                     30: #
1.54      harris41   31: 
1.134     albertel   32: use strict;
1.80      harris41   33: use lib '/home/httpd/lib/perl/';
                     34: use LONCAPA::Configuration;
                     35: 
1.1       albertel   36: use IO::Socket;
                     37: use IO::File;
1.126     albertel   38: #use Apache::File;
1.1       albertel   39: use Symbol;
                     40: use POSIX;
                     41: use Crypt::IDEA;
                     42: use LWP::UserAgent();
1.3       www        43: use GDBM_File;
                     44: use Authen::Krb4;
1.91      albertel   45: use Authen::Krb5;
1.49      albertel   46: use lib '/home/httpd/lib/perl/';
                     47: use localauth;
1.143     foxr       48: use File::Copy;
1.169     foxr       49: use LONCAPA::ConfigFileEdit;
1.1       albertel   50: 
1.77      foxr       51: my $DEBUG = 0;		       # Non zero to enable debug log entries.
                     52: 
1.57      www        53: my $status='';
                     54: my $lastlog='';
                     55: 
1.178.2.1! foxr       56: my $VERSION='$Revision: 1.169 $'; #' 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 {
        !           192:    my $input  = shift;
        !           193:    my $output = '';
        !           194:    
        !           195:    
        !           196:    if($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:    }
        !           206:    
        !           207: }
        !           208: 
        !           209: #
        !           210: #   Register a command processor.  This function is invoked to register a sub
        !           211: #   to process a request.  Once registered, the ProcessRequest sub can automatically
        !           212: #   dispatch requests to an appropriate sub, and do the top level validity checking
        !           213: #   as well:
        !           214: #    - Is the keyword recognized.
        !           215: #    - Is the proper client type attempting the request.
        !           216: #    - Is the request encrypted if it has to be.
        !           217: #   Parameters:
        !           218: #    $RequestName         - Name of the request being registered.
        !           219: #                           This is the command request that will match
        !           220: #                           against the hash keywords to lookup the information
        !           221: #                           associated with the dispatch information.
        !           222: #    $Procedure           - Reference to a sub to call to process the request.
        !           223: #                           All subs get called as follows:
        !           224: #                             Procedure($cmd, $tail, $replyfd, $key)
        !           225: #                             $cmd    - the actual keyword that invoked us.
        !           226: #                             $tail   - the tail of the request that invoked us.
        !           227: #                             $replyfd- File descriptor connected to the client
        !           228: #    $MustEncode          - True if the request must be encoded to be good.
        !           229: #    $ClientOk            - True if it's ok for a client to request this.
        !           230: #    $ManagerOk           - True if it's ok for a manager to request this.
        !           231: # Side effects:
        !           232: #      - On success, the Dispatcher hash has an entry added for the key $RequestName
        !           233: #      - On failure, the program will die as it's a bad internal bug to try to 
        !           234: #        register a duplicate command handler.
        !           235: #
        !           236: sub RegisterHandler {
        !           237:    my $RequestName    = shift;
        !           238:    my $Procedure      = shift;
        !           239:    my $MustEncode     = shift;
        !           240:    my $ClientOk       = shift;
        !           241:    my $ManagerOk      = shift;
        !           242:    
        !           243:    #  Don't allow duplication#
        !           244:    
        !           245:    if (defined $Dispatcher{$RequestName}) {
        !           246:       die "Attempting to define a duplicate request handler for $RequestName\n";
        !           247:    }
        !           248:    #   Build the client type mask:
        !           249:    
        !           250:    my $ClientTypeMask = 0;
        !           251:    if($ClientOk) {
        !           252:       $ClientTypeMask  |= $CLIENT_OK;
        !           253:    }
        !           254:    if($ManagerOk) {
        !           255:       $ClientTypeMask  |= $MANAGER_OK;
        !           256:    }
        !           257:    
        !           258:    #  Enter the hash:
        !           259:       
        !           260:    my @entry = ($Procedure, $MustEncode, $ClientTypeMask);
        !           261:    
        !           262:    $Dispatcher{$RequestName} = \@entry;
        !           263:    
        !           264:    
        !           265: }
        !           266: 
        !           267: #--------------------- Request Handlers --------------------------------------------
        !           268: #
        !           269: #   By convention each request handler registers itself prior to the sub declaration:
        !           270: #
        !           271: 
        !           272: #  Handles ping requests.
        !           273: #  Parameters:
        !           274: #      $cmd    - the actual keyword that invoked us.
        !           275: #      $tail   - the tail of the request that invoked us.
        !           276: #      $replyfd- File descriptor connected to the client
        !           277: #  Implicit Inputs:
        !           278: #      $currenthostid - Global variable that carries the name of the host we are
        !           279: #                       known as.
        !           280: #  Returns:
        !           281: #      1       - Ok to continue processing.
        !           282: #      0       - Program should exit.
        !           283: #  Side effects:
        !           284: #      Reply information is sent to the client.
        !           285: 
        !           286: sub PingHandler {
        !           287:    my $cmd    = shift;
        !           288:    my $tail   = shift;
        !           289:    my $client = shift;
        !           290:    
        !           291:    Reply( $client,"$currenthostid\n","$cmd:$tail");
        !           292:    
        !           293:    return 1;
        !           294: }
        !           295: RegisterHandler("ping", \&PingHandler, 0, 1, 1);       # Ping unencoded, client or manager.
        !           296: #
        !           297: # Handles pong reequests:
        !           298: # Parameters:
        !           299: #      $cmd    - the actual keyword that invoked us.
        !           300: #      $tail   - the tail of the request that invoked us.
        !           301: #      $replyfd- File descriptor connected to the client
        !           302: #  Implicit Inputs:
        !           303: #      $currenthostid - Global variable that carries the name of the host we are
        !           304: #                       connected to.
        !           305: #  Returns:
        !           306: #      1       - Ok to continue processing.
        !           307: #      0       - Program should exit.
        !           308: #  Side effects:
        !           309: #      Reply information is sent to the client.
        !           310: 
        !           311: sub PongHandler {
        !           312:    my $cmd     = shift;
        !           313:    my $tail    = shift;
        !           314:    my $replyfd = shift;
        !           315: 
        !           316:    my $reply=&reply("ping",$clientname);
        !           317:    Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail"); 
        !           318:    return 1;
        !           319: }
        !           320: RegisterHandler("pong", \&PongHandler, 0, 1, 1);       # Pong unencoded, client or manager
        !           321: 
        !           322: #
        !           323: #   EstablishKeyHandler:
        !           324: #      Called to establish an encrypted session key with the remote client.
        !           325: #
        !           326: # Parameters:
        !           327: #      $cmd    - the actual keyword that invoked us.
        !           328: #      $tail   - the tail of the request that invoked us.
        !           329: #      $replyfd- File descriptor connected to the client
        !           330: #  Implicit Inputs:
        !           331: #      $currenthostid - Global variable that carries the name of the host
        !           332: #                       known as.
        !           333: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
        !           334: #  Returns:
        !           335: #      1       - Ok to continue processing.
        !           336: #      0       - Program should exit.
        !           337: #  Implicit Outputs:
        !           338: #      Reply information is sent to the client.
        !           339: #      $cipher is set with a reference to a new IDEA encryption object.
        !           340: #
        !           341: sub EstablishKeyHandler {
        !           342:    my $cmd      = shift;
        !           343:    my $tail     = shift;
        !           344:    my $replyfd  = shift;
        !           345: 
        !           346:    my $buildkey=time.$$.int(rand 100000);
        !           347:    $buildkey=~tr/1-6/A-F/;
        !           348:    $buildkey=int(rand 100000).$buildkey.int(rand 100000);
        !           349:    my $key=$currenthostid.$clientname;
        !           350:    $key=~tr/a-z/A-Z/;
        !           351:    $key=~tr/G-P/0-9/;
        !           352:    $key=~tr/Q-Z/0-9/;
        !           353:    $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
        !           354:    $key=substr($key,0,32);
        !           355:    my $cipherkey=pack("H32",$key);
        !           356:    $cipher=new IDEA $cipherkey;
        !           357:    Reply($replyfd, "$buildkey\n", "$cmd:$tail"); 
        !           358:    
        !           359:    return 1;
        !           360: 
        !           361: }
        !           362: RegisterHandler("ekey", \&EstablishKeyHandler, 0, 1,1);
        !           363: 
        !           364: #  LoadHandler:
        !           365: #     Handler for the load command.  Returns the current system load average
        !           366: #     to the requestor.
        !           367: #
        !           368: # Parameters:
        !           369: #      $cmd    - the actual keyword that invoked us.
        !           370: #      $tail   - the tail of the request that invoked us.
        !           371: #      $replyfd- File descriptor connected to the client
        !           372: #  Implicit Inputs:
        !           373: #      $currenthostid - Global variable that carries the name of the host
        !           374: #                       known as.
        !           375: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
        !           376: #  Returns:
        !           377: #      1       - Ok to continue processing.
        !           378: #      0       - Program should exit.
        !           379: #  Side effects:
        !           380: #      Reply information is sent to the client.
        !           381: sub LoadHandler {
        !           382:    my $cmd     = shift;
        !           383:    my $tail    = shift;
        !           384:    my $replyfd = shift;
        !           385: 
        !           386:    # Get the load average from /proc/loadavg and calculate it as a percentage of
        !           387:    # the allowed load limit as set by the perl global variable lonLoadLim
        !           388: 
        !           389:    my $loadavg;
        !           390:    my $loadfile=IO::File->new('/proc/loadavg');
        !           391:    
        !           392:    $loadavg=<$loadfile>;
        !           393:    $loadavg =~ s/\s.*//g;                       # Extract the first field only.
        !           394:    
        !           395:    my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
        !           396: 
        !           397:    Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
        !           398:    
        !           399:    return 1;
        !           400: }
        !           401: RegisterHandler("load", \&LoadHandler, 0, 1, 0);
        !           402: 
        !           403: 
        !           404: #
        !           405: #   Process the userload request.  This sub returns to the client the current
        !           406: #  user load average.  It can be invoked either by clients or managers.
        !           407: #
        !           408: # Parameters:
        !           409: #      $cmd    - the actual keyword that invoked us.
        !           410: #      $tail   - the tail of the request that invoked us.
        !           411: #      $replyfd- File descriptor connected to the client
        !           412: #  Implicit Inputs:
        !           413: #      $currenthostid - Global variable that carries the name of the host
        !           414: #                       known as.
        !           415: #      $clientname    - Global variable that carries the name of the hsot we're connected to.
        !           416: #  Returns:
        !           417: #      1       - Ok to continue processing.
        !           418: #      0       - Program should exit
        !           419: # Implicit inputs:
        !           420: #     whatever the userload() function requires.
        !           421: #  Implicit outputs:
        !           422: #     the reply is written to the client.
        !           423: #
        !           424: sub UserLoadHandler {
        !           425:    my $cmd     = shift;
        !           426:    my $tail    = shift;
        !           427:    my $replyfd = shift;
        !           428: 
        !           429:    my $userloadpercent=&userload();
        !           430:    Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
        !           431: 
        !           432:    return 1;
        !           433: }
        !           434: RegisterHandler("userload", \&UserLoadHandler, 0, 1, 0);
        !           435: 
        !           436: #   Process a request for the authorization type of a user:
        !           437: #   (userauth).
        !           438: #
        !           439: # Parameters:
        !           440: #      $cmd    - the actual keyword that invoked us.
        !           441: #      $tail   - the tail of the request that invoked us.
        !           442: #      $replyfd- File descriptor connected to the client
        !           443: #  Returns:
        !           444: #      1       - Ok to continue processing.
        !           445: #      0       - Program should exit
        !           446: # Implicit outputs:
        !           447: #    The user authorization type is written to the client.
        !           448: #
        !           449: sub UserAuthorizationType {
        !           450:    my $cmd     = shift;
        !           451:    my $tail    = shift;
        !           452:    my $replyfd = shift;
        !           453:    
        !           454:    my $userinput = "$cmd:$tail";
        !           455:    
        !           456:    #  Pull the domain and username out of the command tail.
        !           457:    # and call GetAuthType to determine the authentication type.
        !           458:    
        !           459:    my ($udom,$uname)=split(/:/,$tail);
        !           460:    my $result = GetAuthType($udom, $uname);
        !           461:    if($result eq "nouser") {
        !           462:       Failure( $replyfd, "unknown_user\n", $userinput);
        !           463:    } else {
        !           464:       Reply( $replyfd, "$result\n", $userinput);
        !           465:    }
        !           466:   
        !           467:    return 1;
        !           468: }
        !           469: RegisterHandler("currentauth", \&UserAuthorizationType, 1, 1, 0);
        !           470: #
        !           471: #   Process a request by a manager to push a hosts or domain table 
        !           472: #   to us.  We pick apart the command and pass it on to the subs
        !           473: #   that already exist to do this.
        !           474: #
        !           475: # Parameters:
        !           476: #      $cmd    - the actual keyword that invoked us.
        !           477: #      $tail   - the tail of the request that invoked us.
        !           478: #      $client - File descriptor connected to the client
        !           479: #  Returns:
        !           480: #      1       - Ok to continue processing.
        !           481: #      0       - Program should exit
        !           482: # Implicit Output:
        !           483: #    a reply is written to the client.
        !           484: 
        !           485: sub PushFileHandler {
        !           486:    my $cmd    = shift;
        !           487:    my $tail   = shift;
        !           488:    my $client = shift;
        !           489: 
        !           490:    my $userinput = "$cmd:$tail";
        !           491: 
        !           492:    # At this time we only know that the IP of our partner is a valid manager
        !           493:    # the code below is a hook to do further authentication (e.g. to resolve
        !           494:    # spoofing).
        !           495: 
        !           496:    my $cert = GetCertificate($userinput);
        !           497:    if(ValidManager($cert)) { 
        !           498: 
        !           499:       # Now presumably we have the bona fides of both the peer host and the
        !           500:       # process making the request.
        !           501:       
        !           502:       my $reply = PushFile($userinput);
        !           503:       Reply($client, "$reply\n", $userinput);
        !           504: 
        !           505:    } else {
        !           506:       Failure( $client, "refused\n", $userinput);
        !           507:    } 
        !           508: }
        !           509: RegisterHandler("pushfile", \&PushFileHandler, 1, 0, 1);
        !           510: 
        !           511: 
        !           512: 
        !           513: #   Process a reinit request.  Reinit requests that either
        !           514: #   lonc or lond be reinitialized so that an updated 
        !           515: #   host.tab or domain.tab can be processed.
        !           516: #
        !           517: # Parameters:
        !           518: #      $cmd    - the actual keyword that invoked us.
        !           519: #      $tail   - the tail of the request that invoked us.
        !           520: #      $client - File descriptor connected to the client
        !           521: #  Returns:
        !           522: #      1       - Ok to continue processing.
        !           523: #      0       - Program should exit
        !           524: #  Implicit output:
        !           525: #     a reply is sent to the client.
        !           526: #
        !           527: sub ReinitProcessHandler {
        !           528:    my $cmd    = shift;
        !           529:    my $tail   = shift;
        !           530:    my $client = shift;
        !           531:    
        !           532:    my $userinput = "$cmd:$tail";
        !           533:    
        !           534:    my $cert = GetCertificate($userinput);
        !           535:    if(ValidManager($cert)) {
        !           536:       chomp($userinput);
        !           537:       my $reply = ReinitProcess($userinput);
        !           538:       Reply( $client,  "$reply\n", $userinput);
        !           539:    } else {
        !           540:       Failure( $client, "refused\n", $userinput);
        !           541: 	}
        !           542:    return 1;
        !           543: }
        !           544: 
        !           545: RegisterHandler("reinit", \&ReinitProcessHandler, 1, 0, 1);
        !           546: 
        !           547: #  Process the editing script for a table edit operation.
        !           548: #  the editing operation must be encrypted and requested by
        !           549: #  a manager host.
        !           550: #
        !           551: # Parameters:
        !           552: #      $cmd    - the actual keyword that invoked us.
        !           553: #      $tail   - the tail of the request that invoked us.
        !           554: #      $client - File descriptor connected to the client
        !           555: #  Returns:
        !           556: #      1       - Ok to continue processing.
        !           557: #      0       - Program should exit
        !           558: #  Implicit output:
        !           559: #     a reply is sent to the client.
        !           560: #
        !           561: sub EditTableHandler {
        !           562:    my $command    = shift;
        !           563:    my $tail       = shift;
        !           564:    my $client     = shift;
        !           565:    
        !           566:    my $userinput = "$command:$tail";
        !           567: 
        !           568:    my $cert = GetCertificate($userinput);
        !           569:    if(ValidManager($cert)) {
        !           570:       my($filetype, $script) = split(/:/, $tail);
        !           571:       if (($filetype eq "hosts") || 
        !           572:           ($filetype eq "domain")) {
        !           573:          if($script ne "") {
        !           574:             Reply($client,            # BUGBUG - EditFile
        !           575:                   EditFile($userinput), #   could fail.
        !           576:                   $userinput);
        !           577:          } else {
        !           578:             Failure($client,"refused\n",$userinput);
        !           579:          }
        !           580:       } else {
        !           581:          Failure($client,"refused\n",$userinput);
        !           582:       }
        !           583:    } else {
        !           584:       Failure($client,"refused\n",$userinput);
        !           585:    }
        !           586:    return 1;
        !           587: }
        !           588: RegisterHandler("edit", \&EditTableHandler, 1, 0, 1);
        !           589: 
        !           590: 
        !           591: #
        !           592: #   Authenticate a user against the LonCAPA authentication
        !           593: #   database.  Note that there are several authentication
        !           594: #   possibilities:
        !           595: #   - unix     - The user can be authenticated against the unix
        !           596: #                password file.
        !           597: #   - internal - The user can be authenticated against a purely 
        !           598: #                internal per user password file.
        !           599: #   - kerberos - The user can be authenticated against either a kerb4 or kerb5
        !           600: #                ticket granting authority.
        !           601: #   - user     - The person tailoring LonCAPA can supply a user authentication mechanism
        !           602: #                that is per system.
        !           603: #
        !           604: # Parameters:
        !           605: #    $cmd      - The command that got us here.
        !           606: #    $tail     - Tail of the command (remaining parameters).
        !           607: #    $client   - File descriptor connected to client.
        !           608: # Returns
        !           609: #     0        - Requested to exit, caller should shut down.
        !           610: #     1        - Continue processing.
        !           611: # Implicit inputs:
        !           612: #    The authentication systems describe above have their own forms of implicit
        !           613: #    input into the authentication process that are described above.
        !           614: #
        !           615: sub AuthenticateHandler {
        !           616:    my $cmd        = shift;
        !           617:    my $tail       = shift;
        !           618:    my $client     = shift;
        !           619:    
        !           620:    #  Regenerate the full input line 
        !           621:    
        !           622:    my $userinput  = $cmd.":".$tail;
        !           623: 
        !           624:    #  udom    - User's domain.
        !           625:    #  uname   - Username.
        !           626:    #  upass   - User's password.
        !           627:    
        !           628:    my ($udom,$uname,$upass)=split(/:/,$tail);
        !           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:       my $pf = IO::File->new($passfilename);
        !           638:       my $realpasswd=<$pf>;
        !           639:       chomp($realpasswd);
        !           640:       my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
        !           641:       my $pwdcorrect=0;
        !           642:       #
        !           643:       #   Authenticate against password stored in the internal file.
        !           644:       #
        !           645:       if ($howpwd eq 'internal') {
        !           646:          &Debug("Internal auth");
        !           647:          $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);
        !           648:       #
        !           649:       #   Authenticate against the unix password file.
        !           650:       #
        !           651:       } elsif ($howpwd eq 'unix') {
        !           652:          &Debug("Unix auth");
        !           653:          if((getpwnam($uname))[1] eq "") { #no such user!
        !           654:             $pwdcorrect = 0;
        !           655:          } else {
        !           656:             $contentpwd=(getpwnam($uname))[1];
        !           657:             my $pwauth_path="/usr/local/sbin/pwauth";
        !           658:             unless ($contentpwd eq 'x') {
        !           659:                $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);
        !           660:             } elsif (-e $pwauth_path) {
        !           661:                open PWAUTH, "|$pwauth_path" or
        !           662:                   die "Cannot invoke authentication";
        !           663:                print PWAUTH "$uname\n$upass\n";
        !           664:                close PWAUTH;
        !           665:                $pwdcorrect=!$?;
        !           666:             }
        !           667:          }
        !           668:       #
        !           669:       #   Authenticate against a Kerberos 4 server:
        !           670:       #
        !           671:       } elsif ($howpwd eq 'krb4') {
        !           672:          my $null=pack("C",0);
        !           673:          unless ($upass=~/$null/) {
        !           674:             my $krb4_error = &Authen::Krb4::get_pw_in_tkt($uname,
        !           675:                                                           "",
        !           676:                                                           $contentpwd,
        !           677:                                                           'krbtgt',
        !           678:                                                          $contentpwd,
        !           679:                                                          1,
        !           680:                                                          $upass);
        !           681:             if (!$krb4_error) {
        !           682:                $pwdcorrect = 1;
        !           683:             } else { 
        !           684:                $pwdcorrect=0; 
        !           685:                # log error if it is not a bad password
        !           686:                if ($krb4_error != 62) {
        !           687:                   &logthis('krb4:'.$uname.','.$contentpwd.','.
        !           688:                            &Authen::Krb4::get_err_txt($Authen::Krb4::error));
        !           689:                }
        !           690:             }
        !           691:          }
        !           692:       #
        !           693:       #   Authenticate against a Kerberos 5 server:
        !           694:       #
        !           695:       } elsif ($howpwd eq 'krb5') {
        !           696:          my $null=pack("C",0);
        !           697:          unless ($upass=~/$null/) {
        !           698:             my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
        !           699:             my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
        !           700:             my $krbserver=&Authen::Krb5::parse_name($krbservice);
        !           701:             my $credentials=&Authen::Krb5::cc_default();
        !           702:             $credentials->initialize($krbclient);
        !           703:             my $krbreturn = &Authen::Krb5::get_in_tkt_with_password(
        !           704:                                                                     $krbclient,
        !           705:                                                                     $krbserver,
        !           706:                                                                     $upass,
        !           707:                                                                     $credentials);
        !           708:             $pwdcorrect = ($krbreturn == 1);
        !           709:          } else { 
        !           710:             $pwdcorrect=0; 
        !           711:          }
        !           712:       #
        !           713:       #  Finally, the user may have written in an authentication module.
        !           714:       #  in that case, if requested, authenticate against it.
        !           715:       #
        !           716:       } elsif ($howpwd eq 'localauth') {
        !           717:          $pwdcorrect=&localauth::localauth($uname,$upass,$contentpwd);
        !           718:       }
        !           719:       #
        !           720:       #   Successfully authorized.
        !           721:       #
        !           722:       if ($pwdcorrect) {
        !           723:          Reply( $client, "authorized\n", $userinput);
        !           724:       #
        !           725:       #  Bad credentials: Failed to authorize
        !           726:       #
        !           727:       } else {
        !           728:          Failure( $client, "non_authorized\n", $userinput);
        !           729:       }
        !           730:    #
        !           731:    #  User bad... note it may be bad security practice to differntiate to the
        !           732:    #  caller a bad user from a  bad passwd... since that supplies covert channel
        !           733:    #  information (you have a good user but bad password e.g.) to guessers.
        !           734:    #
        !           735:    } else {
        !           736:       Failure( $client, "unknown_user\n", $userinput);
        !           737:    }
        !           738:    return 1;
        !           739: }
        !           740: RegisterHandler("auth", \&AuthenticateHandler, 1, 1, 0);
        !           741: 
        !           742: #
        !           743: #   Change a user's password.  Note that this function is complicated by
        !           744: #   the fact that a user may be authenticated in more than one way:
        !           745: #   At present, we are not able to change the password for all types of
        !           746: #   authentication methods.  Only for:
        !           747: #      unix    - unix password or shadow passoword style authentication.
        !           748: #      local   - Locally written authentication mechanism.
        !           749: #   For now, kerb4 and kerb5 password changes are not supported and result
        !           750: #   in an error.
        !           751: # FUTURE WORK:
        !           752: #    Support kerberos passwd changes?
        !           753: # Parameters:
        !           754: #    $cmd      - The command that got us here.
        !           755: #    $tail     - Tail of the command (remaining parameters).
        !           756: #    $client   - File descriptor connected to client.
        !           757: # Returns
        !           758: #     0        - Requested to exit, caller should shut down.
        !           759: #     1        - Continue processing.
        !           760: # Implicit inputs:
        !           761: #    The authentication systems describe above have their own forms of implicit
        !           762: #    input into the authentication process that are described above.
        !           763: sub ChangePasswordHandler {
        !           764:    my $cmd     = shift;
        !           765:    my $tail    = shift;
        !           766:    my $client  = shift;
        !           767:    
        !           768:    my $userinput = $cmd.":".$tail;           # Reconstruct client's string.
        !           769: 
        !           770:    #
        !           771:    #  udom  - user's domain.
        !           772:    #  uname - Username.
        !           773:    #  upass - Current password.
        !           774:    #  npass - New password.
        !           775:    
        !           776:    my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
        !           777:    chomp($npass);
        !           778:    $upass=&unescape($upass);
        !           779:    $npass=&unescape($npass);
        !           780:    &Debug("Trying to change password for $uname");
        !           781:    my $proname=propath($udom,$uname);
        !           782:    my $passfilename="$proname/passwd";
        !           783:    if (-e $passfilename) {
        !           784:       my $realpasswd;
        !           785:       { 
        !           786:          my $pf = IO::File->new($passfilename);
        !           787:          $realpasswd=<$pf>; 
        !           788:       }
        !           789:       chomp($realpasswd);
        !           790:       my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
        !           791:       if ($howpwd eq 'internal') {
        !           792:          &Debug("internal auth");
        !           793:          if (crypt($upass,$contentpwd) eq $contentpwd) {
        !           794:             my $salt=time;
        !           795:             $salt=substr($salt,6,2);
        !           796:             my $ncpass=crypt($npass,$salt);
        !           797:                {
        !           798:                   my $pf = IO::File->new(">$passfilename");
        !           799:                   if ($pf) {
        !           800:                      print $pf "internal:$ncpass\n";
        !           801:                      &logthis("Result of password change for "
        !           802:                               ."$uname: pwchange_success");
        !           803:                      Reply($client, "ok\n", $userinput);
        !           804:                   } else {
        !           805:                      &logthis("Unable to open $uname passwd "               
        !           806:                               ."to change password");
        !           807:                      Failure( $client, "non_authorized\n",$userinput);
        !           808:                   }
        !           809:                }             
        !           810:          } else {
        !           811:             Failure($client, "non_authorized\n", $userinput);
        !           812:          }
        !           813:       } elsif ($howpwd eq 'unix') {
        !           814:          # Unix means we have to access /etc/password
        !           815:          # one way or another.
        !           816:          # First: Make sure the current password is
        !           817:          #        correct
        !           818:          &Debug("auth is unix");
        !           819:          $contentpwd=(getpwnam($uname))[1];
        !           820:          my $pwdcorrect = "0";
        !           821:          my $pwauth_path="/usr/local/sbin/pwauth";
        !           822:          unless ($contentpwd eq 'x') {
        !           823:             $pwdcorrect= (crypt($upass,$contentpwd) eq $contentpwd);
        !           824:          } elsif (-e $pwauth_path) {
        !           825:             open PWAUTH, "|$pwauth_path" or
        !           826:                die "Cannot invoke authentication";
        !           827:             print PWAUTH "$uname\n$upass\n";
        !           828:             close PWAUTH;
        !           829:             &Debug("exited pwauth with $? ($uname,$upass) ");
        !           830:             $pwdcorrect=($? == 0);
        !           831:          }
        !           832:          if ($pwdcorrect) {
        !           833:             my $execdir=$perlvar{'lonDaemons'};
        !           834:             &Debug("Opening lcpasswd pipeline");
        !           835:             my $pf = IO::File->new("|$execdir/lcpasswd > "
        !           836:                                     ."$perlvar{'lonDaemons'}"
        !           837:                                     ."/logs/lcpasswd.log");
        !           838:             print $pf "$uname\n$npass\n$npass\n";
        !           839:             close $pf;
        !           840:             my $err = $?;
        !           841:             my $result = ($err>0 ? 'pwchange_failure' : 'ok');
        !           842:             &logthis("Result of password change for $uname: ".
        !           843:             &lcpasswdstrerror($?));
        !           844:             Reply($client, "$result\n", $userinput);
        !           845:          } else {
        !           846:             Reply($client, "non_authorized\n", $userinput);
        !           847:          }
        !           848:       } else {
        !           849:          Reply( $client, "auth_mode_error\n", $userinput);
        !           850:       }  
        !           851:    } else {
        !           852:             Reply( $client, "unknown_user\n", $userinput);
        !           853:    }
        !           854:    return 1;
        !           855: }
        !           856: RegisterHandler("passwd", \&ChangePasswordHandler, 1, 1, 0);
        !           857: 
        !           858: #
        !           859: #   Create a new user.  User in this case means a lon-capa user.
        !           860: #   The user must either already exist in some authentication realm
        !           861: #   like kerberos or the /etc/passwd.  If not, a user completely local to
        !           862: #   this loncapa system is created.
        !           863: #
        !           864: # Parameters:
        !           865: #    $cmd      - The command that got us here.
        !           866: #    $tail     - Tail of the command (remaining parameters).
        !           867: #    $client   - File descriptor connected to client.
        !           868: # Returns
        !           869: #     0        - Requested to exit, caller should shut down.
        !           870: #     1        - Continue processing.
        !           871: # Implicit inputs:
        !           872: #    The authentication systems describe above have their own forms of implicit
        !           873: #    input into the authentication process that are described above.
        !           874: sub AddUserHandler {
        !           875:    my $cmd     = shift;
        !           876:    my $tail    = shift;
        !           877:    my $client  = shift;
        !           878:    
        !           879:    my $userinput = $cmd.":".$tail;   
        !           880: 
        !           881:    my $oldumask=umask(0077);
        !           882:    my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
        !           883:    &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
        !           884:    chomp($npass);
        !           885:    $npass=&unescape($npass);
        !           886:    my $proname=propath($udom,$uname);
        !           887:    my $passfilename="$proname/passwd";
        !           888:    &Debug("Password file created will be:".$passfilename);
        !           889:    if (-e $passfilename) {
        !           890:       Failure( $client, "already_exists\n", $userinput);
        !           891:    } elsif ($udom ne $currentdomainid) {
        !           892:       Failure($client, "not_right_domain\n", $userinput);
        !           893:    } else {
        !           894:       my @fpparts=split(/\//,$proname);
        !           895:       my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
        !           896:       my $fperror='';
        !           897:       for (my $i=3;$i<=$#fpparts;$i++) {
        !           898:          $fpnow.='/'.$fpparts[$i]; 
        !           899:          unless (-e $fpnow) {
        !           900:             unless (mkdir($fpnow,0777)) {
        !           901:                $fperror="error: ".($!+0)." mkdir failed while attempting "
        !           902:                        ."makeuser";
        !           903:             }
        !           904:          }
        !           905:       }
        !           906:       unless ($fperror) {
        !           907:          my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
        !           908:          Reply($client, $result, $userinput);     #BUGBUG - could be fail
        !           909:       } else {
        !           910:          Failure($client, "$fperror\n", $userinput);
        !           911:       }
        !           912:    }
        !           913:    umask($oldumask);
        !           914:    return 1;
        !           915: 
        !           916: }
        !           917: RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0);
        !           918: 
        !           919: #
        !           920: #   Change the authentication method of a user.  Note that this may
        !           921: #   also implicitly change the user's password if, for example, the user is
        !           922: #   joining an existing authentication realm.  Known authentication realms at
        !           923: #   this time are:
        !           924: #    internal   - Purely internal password file (only loncapa knows this user)
        !           925: #    local      - Institutionally written authentication module.
        !           926: #    unix       - Unix user (/etc/passwd with or without /etc/shadow).
        !           927: #    kerb4      - kerberos version 4
        !           928: #    kerb5      - kerberos version 5
        !           929: #
        !           930: # Parameters:
        !           931: #    $cmd      - The command that got us here.
        !           932: #    $tail     - Tail of the command (remaining parameters).
        !           933: #    $client   - File descriptor connected to client.
        !           934: # Returns
        !           935: #     0        - Requested to exit, caller should shut down.
        !           936: #     1        - Continue processing.
        !           937: # Implicit inputs:
        !           938: #    The authentication systems describe above have their own forms of implicit
        !           939: #    input into the authentication process that are described above.
        !           940: #
        !           941: sub ChangeAuthenticationHandler {
        !           942:    my $cmd     = shift;
        !           943:    my $tail    = shift;
        !           944:    my $client  = shift;
        !           945:    
        !           946:    my $userinput  = "$cmd:$tail";              # Reconstruct user input.
        !           947: 
        !           948:    my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
        !           949:    chomp($npass);
        !           950:    &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
        !           951:    $npass=&unescape($npass);
        !           952:    my $proname=&propath($udom,$uname);
        !           953:    my $passfilename="$proname/passwd";
        !           954:    if ($udom ne $currentdomainid) {
        !           955:       Failure( $client, "not_right_domain\n", $client);
        !           956:    } else {
        !           957:       my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
        !           958:       Reply($client, $result, $userinput);
        !           959:    }
        !           960:    return 1;
        !           961: }
        !           962: RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0);
        !           963: 
        !           964: #
        !           965: #   Determines if this is the home server for a user.  The home server
        !           966: #   for a user will have his/her lon-capa passwd file.  Therefore all we need
        !           967: #   to do is determine if this file exists.
        !           968: #
        !           969: # Parameters:
        !           970: #    $cmd      - The command that got us here.
        !           971: #    $tail     - Tail of the command (remaining parameters).
        !           972: #    $client   - File descriptor connected to client.
        !           973: # Returns
        !           974: #     0        - Requested to exit, caller should shut down.
        !           975: #     1        - Continue processing.
        !           976: # Implicit inputs:
        !           977: #    The authentication systems describe above have their own forms of implicit
        !           978: #    input into the authentication process that are described above.
        !           979: #
        !           980: sub IsHomeHandler {
        !           981:    my $cmd     = shift;
        !           982:    my $tail    = shift;
        !           983:    my $client  = shift;
        !           984:    
        !           985:    my $userinput  = "$cmd:$tail";
        !           986:    
        !           987:    my ($udom,$uname)=split(/:/,$tail);
        !           988:    chomp($uname);
        !           989:    my $proname=propath($udom,$uname);
        !           990:    if (-e $proname) {
        !           991:       Reply( $client, "found\n", $userinput);
        !           992:    } else {
        !           993:       Failure($client, "not_found\n", $userinput);
        !           994:    }
        !           995:    return 1;
        !           996: }
        !           997: RegisterHandler("home", \&IsHomeHandler, 0,1,0);
        !           998: #
        !           999: #   Process an update request for a resource?? I think what's going on here is
        !          1000: #   that a resource has been modified that we hold a subscription to.
        !          1001: #   If the resource is not local, then we must update, or at least invalidate our
        !          1002: #   cached copy of the resource. 
        !          1003: #   FUTURE WORK:
        !          1004: #      I need to look at this logic carefully.  My druthers would be to follow
        !          1005: #      typical caching logic, and simple invalidate the cache, drop any subscription
        !          1006: #      an let the next fetch start the ball rolling again... however that may
        !          1007: #      actually be more difficult than it looks given the complex web of
        !          1008: #      proxy servers.
        !          1009: # Parameters:
        !          1010: #    $cmd      - The command that got us here.
        !          1011: #    $tail     - Tail of the command (remaining parameters).
        !          1012: #    $client   - File descriptor connected to client.
        !          1013: # Returns
        !          1014: #     0        - Requested to exit, caller should shut down.
        !          1015: #     1        - Continue processing.
        !          1016: # Implicit inputs:
        !          1017: #    The authentication systems describe above have their own forms of implicit
        !          1018: #    input into the authentication process that are described above.
        !          1019: #
        !          1020: sub UpdateResourceHandler {
        !          1021:    my $cmd    = shift;
        !          1022:    my $tail   = shift;
        !          1023:    my $client = shift;
        !          1024:    
        !          1025:    my $userinput = "$cmd:$tail";
        !          1026:    
        !          1027:    my $fname=$tail;
        !          1028:    my $ownership=ishome($fname);
        !          1029:    if ($ownership eq 'not_owner') {
        !          1030:       if (-e $fname) {
        !          1031:          my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
        !          1032:              $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
        !          1033:          my $now=time;
        !          1034:          my $since=$now-$atime;
        !          1035:          if ($since>$perlvar{'lonExpire'}) {
        !          1036:             my $reply=&reply("unsub:$fname","$clientname");
        !          1037:             unlink("$fname");
        !          1038:          } else {
        !          1039:             my $transname="$fname.in.transfer";
        !          1040:             my $remoteurl=&reply("sub:$fname","$clientname");
        !          1041:             my $response;
        !          1042:             alarm(120);
        !          1043:             {
        !          1044:                my $ua=new LWP::UserAgent;
        !          1045:                my $request=new HTTP::Request('GET',"$remoteurl");
        !          1046:                $response=$ua->request($request,$transname);
        !          1047:             }
        !          1048:             alarm(0);
        !          1049:             if ($response->is_error()) {
        !          1050:                unlink($transname);
        !          1051:                my $message=$response->status_line;
        !          1052:                &logthis("LWP GET: $message for $fname ($remoteurl)");
        !          1053:             } else {
        !          1054:                if ($remoteurl!~/\.meta$/) {
        !          1055:                   alarm(120);
        !          1056:                   {
        !          1057:                      my $ua=new LWP::UserAgent;
        !          1058:                      my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
        !          1059:                      my $mresponse=$ua->request($mrequest,$fname.'.meta');
        !          1060:                      if ($mresponse->is_error()) {
        !          1061:                         unlink($fname.'.meta');
        !          1062:                      }
        !          1063:                   }
        !          1064:                   alarm(0);
        !          1065:                }
        !          1066:                rename($transname,$fname);
        !          1067:             }
        !          1068:          }
        !          1069:                Reply( $client, "ok\n", $userinput);
        !          1070:       } else {
        !          1071:          Failure($client, "not_found\n", $userinput);
        !          1072:       }
        !          1073:    } else {
        !          1074:       Failure($client, "rejected\n", $userinput);
        !          1075:    }
        !          1076:    return 1;
        !          1077: }
        !          1078: RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0);
        !          1079: 
        !          1080: #
        !          1081: #   Fetch a user file from a remote server:
        !          1082: # Parameters:
        !          1083: #    $cmd      - The command that got us here.
        !          1084: #    $tail     - Tail of the command (remaining parameters).
        !          1085: #    $client   - File descriptor connected to client.
        !          1086: # Returns
        !          1087: #     0        - Requested to exit, caller should shut down.
        !          1088: #     1        - Continue processing.
        !          1089: #
        !          1090: sub FetchUserFileHandler {
        !          1091:    my $cmd     = shift;
        !          1092:    my $tail    = shift;
        !          1093:    my $client  = shift;
        !          1094:    
        !          1095:    my $userinput = "$cmd:$tail";
        !          1096:    my $fname           = $tail;
        !          1097:    my ($udom,$uname,$ufile)=split(/\//,$fname);
        !          1098:    my $udir=propath($udom,$uname).'/userfiles';
        !          1099:    unless (-e $udir) {
        !          1100:       mkdir($udir,0770); 
        !          1101:    }
        !          1102:    if (-e $udir) {
        !          1103:       $ufile=~s/^[\.\~]+//;
        !          1104:       $ufile=~s/\///g;
        !          1105:       my $destname=$udir.'/'.$ufile;
        !          1106:       my $transname=$udir.'/'.$ufile.'.in.transit';
        !          1107:       my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
        !          1108:       my $response;
        !          1109:       alarm(120);
        !          1110:       {
        !          1111:          my $ua=new LWP::UserAgent;
        !          1112:          my $request=new HTTP::Request('GET',"$remoteurl");
        !          1113:          $response=$ua->request($request,$transname);
        !          1114:       }
        !          1115:       alarm(0);
        !          1116:       if ($response->is_error()) {
        !          1117:          unlink($transname);
        !          1118:          my $message=$response->status_line;
        !          1119:          &logthis("LWP GET: $message for $fname ($remoteurl)");
        !          1120:          Failure($client, "failed\n", $userinput);
        !          1121:       } else {
        !          1122:          if (!rename($transname,$destname)) {
        !          1123:             &logthis("Unable to move $transname to $destname");
        !          1124:             unlink($transname);
        !          1125:             Failure($client, "failed\n", $userinput);
        !          1126:          } else {
        !          1127:             Reply($client, "ok\n", $userinput);
        !          1128:          }
        !          1129:       }   
        !          1130:    } else {
        !          1131:       Failure($client, "not_home\n", $userinput);
        !          1132:    }
        !          1133:    return 1;
        !          1134: }
        !          1135: RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0);
        !          1136: #
        !          1137: #   Authenticate access to a user file.  Question?   The token for athentication
        !          1138: #   is allowed to be sent as cleartext is this really what we want?  This token
        !          1139: #   represents the user's session id.  Once it is forged does this allow too much access??
        !          1140: #
        !          1141: # Parameters:
        !          1142: #    $cmd      - The command that got us here.
        !          1143: #    $tail     - Tail of the command (remaining parameters).
        !          1144: #    $client   - File descriptor connected to client.
        !          1145: # Returns
        !          1146: #     0        - Requested to exit, caller should shut down.
        !          1147: #     1        - Continue processing.
        !          1148: sub AuthenticateUserFileAccess {
        !          1149:    my $cmd   = shift;
        !          1150:    my $tail    = shift;
        !          1151:    my $client = shift;
        !          1152:    my $userinput = "$cmd:$tail";
        !          1153: 
        !          1154:    my ($fname,$session)=split(/:/,$tail);
        !          1155:    chomp($session);
        !          1156:    my $reply='non_auth';
        !          1157:    if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) {
        !          1158:       while (my $line=<ENVIN>) {
        !          1159:          if ($line=~/userfile\.$fname\=/) { 
        !          1160:             $reply='ok'; 
        !          1161:          }
        !          1162:       }
        !          1163:       close(ENVIN);
        !          1164:       Reply($client, $reply."\n", $userinput);
        !          1165:    } else {
        !          1166:       Failure($client, "invalid_token\n", $userinput);
        !          1167:    }
        !          1168:    return 1;
        !          1169:    
        !          1170: }
        !          1171: RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);
        !          1172: #
        !          1173: #   Unsubscribe from a resource.
        !          1174: #
        !          1175: # Parameters:
        !          1176: #    $cmd      - The command that got us here.
        !          1177: #    $tail     - Tail of the command (remaining parameters).
        !          1178: #    $client   - File descriptor connected to client.
        !          1179: # Returns
        !          1180: #     0        - Requested to exit, caller should shut down.
        !          1181: #     1        - Continue processing.
        !          1182: #
        !          1183: sub UnsubscribeHandler {
        !          1184:    my $cmd      = shift;
        !          1185:    my $tail     = shift;
        !          1186:    my $client   = shift;
        !          1187:    my $userinput= "$cmd:$tail";
        !          1188: 
        !          1189:    my $fname = $tail;
        !          1190:    if (-e $fname) {
        !          1191:       Reply($client, &unsub($client,$fname,$clientip), $userinput);
        !          1192:    } else {
        !          1193:       Failure($client, "not_found\n", $userinput);
        !          1194:    }
        !          1195:    return 1;
        !          1196: }
        !          1197: RegisterHandler("unusb", \&UnsubscribeHandler, 0, 1, 0);
        !          1198: 
        !          1199: #   Subscribe to a resource.
        !          1200: #
        !          1201: # Parameters:
        !          1202: #    $cmd      - The command that got us here.
        !          1203: #    $tail     - Tail of the command (remaining parameters).
        !          1204: #    $client   - File descriptor connected to client.
        !          1205: # Returns
        !          1206: #     0        - Requested to exit, caller should shut down.
        !          1207: #     1        - Continue processing.
        !          1208: #
        !          1209: sub SubscribeHandler {
        !          1210:    my $cmd        = shift;
        !          1211:    my $tail       = shift;
        !          1212:    my $client     = shift;
        !          1213:    my $userinput  = "$cmd:$tail";
        !          1214: 
        !          1215:    Reply( $client, &subscribe($userinput,$clientip), $userinput);
        !          1216:  
        !          1217:    return 1;
        !          1218: }
        !          1219: RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0);
        !          1220: 
        !          1221: #
        !          1222: #   Determine the version of a resource (?) Or is it return
        !          1223: #   the top version of the resource?  Not yet clear from the
        !          1224: #   code in currentversion.
        !          1225: #
        !          1226: # Parameters:
        !          1227: #    $cmd      - The command that got us here.
        !          1228: #    $tail     - Tail of the command (remaining parameters).
        !          1229: #    $client   - File descriptor connected to client.
        !          1230: # Returns
        !          1231: #     0        - Requested to exit, caller should shut down.
        !          1232: #     1        - Continue processing.
        !          1233: #
        !          1234: sub CurrentVersionHandler {
        !          1235:    my $cmd      = shift;
        !          1236:    my $tail     = shift;
        !          1237:    my $client   = shift;
        !          1238:    my $userinput= "$cmd:$tail";
        !          1239:    
        !          1240:    my $fname   = $tail;
        !          1241:    Reply( $client, &currentversion($fname)."\n", $userinput);
        !          1242:    return 1;
        !          1243: 
        !          1244: }
        !          1245: RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0);
        !          1246: 
        !          1247: 
        !          1248: #  Make an entry in a user's activity log.
        !          1249: #
        !          1250: # Parameters:
        !          1251: #    $cmd      - The command that got us here.
        !          1252: #    $tail     - Tail of the command (remaining parameters).
        !          1253: #    $client   - File descriptor connected to client.
        !          1254: # Returns
        !          1255: #     0        - Requested to exit, caller should shut down.
        !          1256: #     1        - Continue processing.
        !          1257: #
        !          1258: sub ActivityLogEntryHandler {
        !          1259:    my $cmd      = shift;
        !          1260:    my $tail     = shift;
        !          1261:    my $client   = shift;
        !          1262:    my $userinput= "$cmd:$tail";
        !          1263: 
        !          1264:    my ($udom,$uname,$what)=split(/:/,$tail);
        !          1265:    chomp($what);
        !          1266:    my $proname=propath($udom,$uname);
        !          1267:    my $now=time;
        !          1268:    my $hfh;
        !          1269:    if ($hfh=IO::File->new(">>$proname/activity.log")) { 
        !          1270:       print $hfh "$now:$clientname:$what\n";
        !          1271:       Reply( $client, "ok\n", $userinput); 
        !          1272:    } else {
        !          1273:       Reply($client, "error: ".($!+0)." IO::File->new Failed "
        !          1274:             ."while attempting log\n", 
        !          1275:             $userinput);
        !          1276:    }
        !          1277: 
        !          1278:    return 1;
        !          1279: }
        !          1280: RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0);
        !          1281: #
        !          1282: #   Put a namespace entry in a user profile hash.
        !          1283: #   My druthers would be for this to be an encrypted interaction too.
        !          1284: #   anything that might be an inadvertent covert channel about either
        !          1285: #   user authentication or user personal information....
        !          1286: #
        !          1287: # Parameters:
        !          1288: #    $cmd      - The command that got us here.
        !          1289: #    $tail     - Tail of the command (remaining parameters).
        !          1290: #    $client   - File descriptor connected to client.
        !          1291: # Returns
        !          1292: #     0        - Requested to exit, caller should shut down.
        !          1293: #     1        - Continue processing.
        !          1294: #
        !          1295: sub PutUserProfileEntry {
        !          1296:    my $cmd       = shift;
        !          1297:    my $tail      = shift;
        !          1298:    my $client    = shift;
        !          1299:    my $userinput = "$cmd:$tail";
        !          1300: 
        !          1301:    my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
        !          1302:    $namespace=~s/\//\_/g;
        !          1303:    $namespace=~s/\W//g;
        !          1304:    if ($namespace ne 'roles') {
        !          1305:       chomp($what);
        !          1306:       my $proname=propath($udom,$uname);
        !          1307:       my $now=time;
        !          1308:       unless ($namespace=~/^nohist\_/) {
        !          1309:          my $hfh;
        !          1310:          if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1311:             print $hfh "P:$now:$what\n"; 
        !          1312:          }
        !          1313:       }
        !          1314:       my @pairs=split(/\&/,$what);
        !          1315:       my %hash;
        !          1316:       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
        !          1317:                   &GDBM_WRCREAT(),0640)) {
        !          1318:          foreach my $pair (@pairs) {
        !          1319:             my ($key,$value)=split(/=/,$pair);
        !          1320:             $hash{$key}=$value;
        !          1321:          }
        !          1322:          if (untie(%hash)) {
        !          1323:             Reply( $client, "ok\n", $userinput);
        !          1324:          } else {
        !          1325:             Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
        !          1326:                   "while attempting put\n", 
        !          1327:                   $userinput);
        !          1328:          }
        !          1329:       } else {
        !          1330:          Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
        !          1331: 			         "while attempting put\n", $userinput);
        !          1332:       }
        !          1333:    } else {
        !          1334:       Failure( $client, "refused\n", $userinput);
        !          1335:    }
        !          1336:    
        !          1337:    return 1;
        !          1338: }
        !          1339: RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0);
        !          1340: 
        !          1341: # 
        !          1342: #   Increment a profile entry in the user history file.
        !          1343: #   The history contains keyword value pairs.  In this case,
        !          1344: #   The value itself is a pair of numbers.  The first, the current value
        !          1345: #   the second an increment that this function applies to the current
        !          1346: #   value.
        !          1347: #
        !          1348: # Parameters:
        !          1349: #    $cmd      - The command that got us here.
        !          1350: #    $tail     - Tail of the command (remaining parameters).
        !          1351: #    $client   - File descriptor connected to client.
        !          1352: # Returns
        !          1353: #     0        - Requested to exit, caller should shut down.
        !          1354: #     1        - Continue processing.
        !          1355: #
        !          1356: sub IncrementUserValueHandler {
        !          1357:    my $cmd         = shift;
        !          1358:    my $tail        = shift;
        !          1359:    my $client      = shift;
        !          1360:    my $userinput   = shift;
        !          1361: 
        !          1362:    my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
        !          1363:    $namespace=~s/\//\_/g;
        !          1364:    $namespace=~s/\W//g;
        !          1365:    if ($namespace ne 'roles') {
        !          1366:       chomp($what);
        !          1367:       my $proname=propath($udom,$uname);
        !          1368:       my $now=time;
        !          1369:       unless ($namespace=~/^nohist\_/) {
        !          1370:          my $hfh;
        !          1371:          if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1372:             print $hfh "P:$now:$what\n";
        !          1373:          }
        !          1374:       }
        !          1375:       my @pairs=split(/\&/,$what);
        !          1376:       my %hash;
        !          1377:       if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),
        !          1378:                0640)) {
        !          1379:          foreach my $pair (@pairs) {
        !          1380:             my ($key,$value)=split(/=/,$pair);
        !          1381:             # We could check that we have a number...
        !          1382:             if (! defined($value) || $value eq '') {
        !          1383:                $value = 1;
        !          1384:             }
        !          1385:             $hash{$key}+=$value;
        !          1386:          }
        !          1387:          if (untie(%hash)) {
        !          1388:             Reply( $client, "ok\n", $userinput);
        !          1389:          } else {
        !          1390:             Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
        !          1391:                      "while attempting put\n", $userinput);
        !          1392:          }
        !          1393:       } else {
        !          1394:          Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1395:                   "while attempting put\n", $userinput);
        !          1396:       }
        !          1397:    } else {
        !          1398:       Failure($client, "refused\n", $userinput);
        !          1399:    }
        !          1400: 
        !          1401:    return 1;
        !          1402: }
        !          1403: RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0);
        !          1404: #
        !          1405: #   Put a new role for a user.  Roles are LonCAPA's packaging of permissions.
        !          1406: #   Each 'role' a user has implies a set of permissions.  Adding a new role
        !          1407: #   for a person grants the permissions packaged with that role
        !          1408: #   to that user when the role is selected.
        !          1409: #
        !          1410: # Parameters:
        !          1411: #    $cmd       - The command string (rolesput).
        !          1412: #    $tail      - The remainder of the request line.  For rolesput this
        !          1413: #                 consists of a colon separated list that contains:
        !          1414: #                 The domain and user that is granting the role (logged).
        !          1415: #                 The domain and user that is getting the role.
        !          1416: #                 The roles being granted as a set of & separated pairs.
        !          1417: #                 each pair a key value pair.
        !          1418: #    $client    - File descriptor connected to the client.
        !          1419: # Returns:
        !          1420: #     0         - If the daemon should exit
        !          1421: #     1         - To continue processing.
        !          1422: #
        !          1423: #
        !          1424: sub RolesPutHandler {
        !          1425:    my $cmd        = shift;
        !          1426:    my $tail       = shift;
        !          1427:    my $client     = shift;
        !          1428:    my $userinput  = "$cmd:$tail";
        !          1429:    
        !          1430:    my ($exedom,$exeuser,$udom,$uname,$what)   =split(/:/,$tail);
        !          1431:    &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
        !          1432:           "what = ".$what);
        !          1433:    my $namespace='roles';
        !          1434:    chomp($what);
        !          1435:    my $proname=propath($udom,$uname);
        !          1436:    my $now=time;
        !          1437:    #
        !          1438:    #  Log the attempt to set a role.  The {}'s here ensure that the file 
        !          1439:    #  handle is open for the minimal amount of time.  Since the flush
        !          1440:    #  is done on close this improves the chances the log will be an un-
        !          1441:    #  corrupted ordered thing.
        !          1442:    {
        !          1443:       my $hfh;
        !          1444:       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1445:          print $hfh "P:$now:$exedom:$exeuser:$what\n";
        !          1446:       }
        !          1447:    }
        !          1448:    my @pairs=split(/\&/,$what);
        !          1449:    my %hash;
        !          1450:    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_WRCREAT(),0640)) {
        !          1451:       foreach my $pair (@pairs) {
        !          1452:          my ($key,$value)=split(/=/,$pair);
        !          1453:             &ManagePermissions($key, $udom, $uname,
        !          1454:                                &GetAuthType( $udom, $uname));
        !          1455:             $hash{$key}=$value;
        !          1456:       }
        !          1457:       if (untie(%hash)) {
        !          1458:          Reply($client, "ok\n", $userinput);
        !          1459:       } else {
        !          1460:          Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1461: 			                         "while attempting rolesput\n", $userinput);
        !          1462:       }
        !          1463:    } else {
        !          1464:       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1465:                         "while attempting rolesput\n", $userinput);
        !          1466:    }
        !          1467:    return 1;
        !          1468: }
        !          1469: RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0);  # Encoded client only.
        !          1470: #
        !          1471: #   Deletes (removes) a role for a user.   This is equivalent to removing
        !          1472: #  a permissions package associated with the role from the user's profile.
        !          1473: #
        !          1474: # Parameters:
        !          1475: #     $cmd                 - The command (rolesdel)
        !          1476: #     $tail                - The remainder of the request line. This consists
        !          1477: #                             of:
        !          1478: #                             The domain and user requesting the change (logged)
        !          1479: #                             The domain and user being changed.
        !          1480: #                             The roles being revoked.  These are shipped to us
        !          1481: #                             as a bunch of & separated role name keywords.
        !          1482: #     $client              - The file handle open on the client.
        !          1483: # Returns:
        !          1484: #     1                    - Continue processing
        !          1485: #     0                    - Exit.
        !          1486: #
        !          1487: sub RolesDeleteHandler {
        !          1488:    my $cmd          = shift;
        !          1489:    my $tail         = shift;
        !          1490:    my $client       = shift;
        !          1491:    my $userinput    = "$cmd:$tail";
        !          1492:    
        !          1493:    my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
        !          1494:    &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
        !          1495:           "what = ".$what);
        !          1496:    my $namespace='roles';
        !          1497:    chomp($what);
        !          1498:    my $proname=propath($udom,$uname);
        !          1499:    my $now=time;
        !          1500:    #
        !          1501:    #   Log the attempt. This {}'ing is done to ensure that the
        !          1502:    #   logfile is flushed and closed as quickly as possible.  Hopefully
        !          1503:    #   this preserves both time ordering and reduces the probability that
        !          1504:    #   messages will be interleaved.
        !          1505:    #
        !          1506:    {
        !          1507:       my $hfh;
        !          1508:       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1509:          print $hfh "D:$now:$exedom:$exeuser:$what\n";
        !          1510:       }
        !          1511:    }
        !          1512:    my @rolekeys=split(/\&/,$what);
        !          1513:    my %hash;
        !          1514:    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_WRCREAT(),0640)) {
        !          1515:       foreach my $key (@rolekeys) {
        !          1516:          delete $hash{$key};
        !          1517:       }
        !          1518:       if (untie(%hash)) {
        !          1519:          Reply($client, "ok\n", $userinput);
        !          1520:       } else {
        !          1521:          Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1522:                            "while attempting rolesdel\n", $userinput);
        !          1523:       }
        !          1524:    } else {
        !          1525:       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1526:                         "while attempting rolesdel\n", $userinput);
        !          1527:    }
        !          1528: 
        !          1529:    return 1;
        !          1530: }
        !          1531: RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only
        !          1532: 
        !          1533: # Unencrypted get from a user's profile database.  See 
        !          1534: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
        !          1535: # This function retrieves a keyed item from a specific named database in the
        !          1536: # user's directory.
        !          1537: #
        !          1538: # Parameters:
        !          1539: #   $cmd             - Command request keyword (get).
        !          1540: #   $tail            - Tail of the command.  This is a colon separated list
        !          1541: #                      consisting of the domain and username that uniquely
        !          1542: #                      identifies the profile,
        !          1543: #                      The 'namespace' which selects the gdbm file to 
        !          1544: #                      do the lookup in, 
        !          1545: #                      & separated list of keys to lookup.  Note that
        !          1546: #                      the values are returned as an & separated list too.
        !          1547: #   $client          - File descriptor open on the client.
        !          1548: # Returns:
        !          1549: #   1       - Continue processing.
        !          1550: #   0       - Exit.
        !          1551: #
        !          1552: sub GetProfileEntry {
        !          1553:    my $cmd      = shift;
        !          1554:    my $tail     = shift;
        !          1555:    my $client   = shift;
        !          1556:    my $userinput= "$cmd:$tail";
        !          1557:    
        !          1558:    my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
        !          1559:    $namespace=~s/\//\_/g;
        !          1560:    $namespace=~s/\W//g;
        !          1561:    chomp($what);
        !          1562:    my @queries=split(/\&/,$what);
        !          1563:    my $proname=propath($udom,$uname);
        !          1564:    my $qresult='';
        !          1565:    my %hash;
        !          1566:    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {
        !          1567:       for (my $i=0;$i<=$#queries;$i++) {
        !          1568:          $qresult.="$hash{$queries[$i]}&";    # Presumably failure gives empty string.
        !          1569:       }
        !          1570:       if (untie(%hash)) {
        !          1571:          $qresult=~s/\&$//;              # Remove trailing & from last lookup.
        !          1572:          Reply($client, "$qresult\n", $userinput);
        !          1573:       } else {
        !          1574:          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1575:                           "while attempting get\n", $userinput);
        !          1576:       }
        !          1577:    } else {
        !          1578:       if ($!+0 == 2) {                # +0 coerces errno -> number 2 is ENOENT
        !          1579:          Failure($client, "error:No such file or ".
        !          1580:                           "GDBM reported bad block error\n", $userinput);
        !          1581:       } else {                        # Some other undifferentiated err.
        !          1582:          Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1583:                            "while attempting get\n", $userinput);
        !          1584:       }
        !          1585:    }
        !          1586:    return 1;
        !          1587: }
        !          1588: RegisterHandler("get", \&GetProfileEntry, 0,1,0);
        !          1589: #
        !          1590: #  Process the encrypted get request.  Note that the request is sent
        !          1591: #  in clear, but the reply is encrypted.  This is a small covert channel:
        !          1592: #  information about the sensitive keys is given to the snooper.  Just not
        !          1593: #  information about the values of the sensitive key.  Hmm if I wanted to
        !          1594: #  know these I'd snoop for the egets. Get the profile item names from them
        !          1595: #  and then issue a get for them since there's no enforcement of the
        !          1596: #  requirement of an encrypted get for particular profile items.  If I
        !          1597: #  were re-doing this, I'd force the request to be encrypted as well as the
        !          1598: #  reply.  I'd also just enforce encrypted transactions for all gets since
        !          1599: #  that would prevent any covert channel snooping.
        !          1600: #
        !          1601: #  Parameters:
        !          1602: #     $cmd               - Command keyword of request (eget).
        !          1603: #     $tail              - Tail of the command.  See GetProfileEntry
#                          for more information about this.
        !          1604: #     $client            - File open on the client.
        !          1605: #  Returns:
        !          1606: #     1      - Continue processing
        !          1607: #     0      - server should exit.
        !          1608: sub GetProfileEntryEncrypted {
        !          1609:    my $cmd       = shift;
        !          1610:    my $tail      = shift;
        !          1611:    my $client    = shift;
        !          1612:    my $userinput = "$cmd:$tail";
        !          1613:    
        !          1614:    my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
        !          1615:    $namespace=~s/\//\_/g;
        !          1616:    $namespace=~s/\W//g;
        !          1617:    chomp($what);
        !          1618:    my @queries=split(/\&/,$what);
        !          1619:    my $proname=propath($udom,$uname);
        !          1620:    my $qresult='';
        !          1621:    my %hash;
        !          1622:    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
        !          1623:       for (my $i=0;$i<=$#queries;$i++) {
        !          1624:          $qresult.="$hash{$queries[$i]}&";
        !          1625:       }
        !          1626:       if (untie(%hash)) {
        !          1627:          $qresult=~s/\&$//;
        !          1628:          if ($cipher) {
        !          1629:             my $cmdlength=length($qresult);
        !          1630:             $qresult.="         ";
        !          1631:             my $encqresult='';
        !          1632:             for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
        !          1633:                $encqresult.= unpack("H16", $cipher->encrypt(substr($qresult,
        !          1634:                                                                    $encidx,
        !          1635:                                                                    8)));
        !          1636:             }
        !          1637:             Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
        !          1638:          } else {
        !          1639:             Failure( $client, "error:no_key\n", $userinput);
        !          1640:          }
        !          1641:       } else {
        !          1642:          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1643:                               "while attempting eget\n", $userinput);
        !          1644:       }
        !          1645:    } else {
        !          1646:       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1647:                        "while attempting eget\n", $userinput);
        !          1648:    }
        !          1649:          
        !          1650:    return 1;
        !          1651: }
        !          1652: RegisterHandler("eget", \&GetProfileEncrypted, 0, 1, 0);
        !          1653: 
        !          1654: #
        !          1655: #   Deletes a key in a user profile database.
        !          1656: #   
        !          1657: #   Parameters:
        !          1658: #       $cmd                  - Command keyword (del).
        !          1659: #       $tail                 - Command tail.  IN this case a colon
        !          1660: #                               separated list containing:
        !          1661: #                               The domain and user that identifies uniquely
        !          1662: #                               the identity of the user.
        !          1663: #                               The profile namespace (name of the profile
        !          1664: #                               database file).
        !          1665: #                               & separated list of keywords to delete.
        !          1666: #       $client              - File open on client socket.
        !          1667: # Returns:
        !          1668: #     1   - Continue processing
        !          1669: #     0   - Exit server.
        !          1670: #
        !          1671: #
        !          1672: sub DeletProfileEntry {
        !          1673:    my $cmd      = shift;
        !          1674:    my $tail     = shift;
        !          1675:    my $client   = shift;
        !          1676:    my $userinput = "cmd:$tail";
        !          1677: 
        !          1678:    my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
        !          1679:    $namespace=~s/\//\_/g;
        !          1680:    $namespace=~s/\W//g;
        !          1681:    chomp($what);
        !          1682:    my $proname=propath($udom,$uname);
        !          1683:    my $now=time;
        !          1684:    unless ($namespace=~/^nohist\_/) {
        !          1685:       my $hfh;
        !          1686:       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) { 
        !          1687:          print $hfh "D:$now:$what\n"; 
        !          1688:       }
        !          1689:    }
        !          1690:    my @keys=split(/\&/,$what);
        !          1691:    my %hash;
        !          1692:    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
        !          1693:       foreach my $key (@keys) {
        !          1694:          delete($hash{$key});
        !          1695:       }
        !          1696:       if (untie(%hash)) {
        !          1697:          Reply($client, "ok\n", $userinput);
        !          1698:       } else {
        !          1699:          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1700:                            "while attempting del\n", $userinput);
        !          1701:       }
        !          1702:    } else {
        !          1703:       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1704:                         "while attempting del\n", $userinput);
        !          1705:    }
        !          1706:    return 1;
        !          1707: }
        !          1708: RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0);
        !          1709: #
        !          1710: #  List the set of keys that are defined in a profile database file.
        !          1711: #  A successful reply from this will contain an & separated list of
        !          1712: #  the keys. 
        !          1713: # Parameters:
        !          1714: #     $cmd              - Command request (keys).
        !          1715: #     $tail             - Remainder of the request, a colon separated
        !          1716: #                         list containing domain/user that identifies the
        !          1717: #                         user being queried, and the database namespace
        !          1718: #                         (database filename essentially).
        !          1719: #     $client           - File open on the client.
        !          1720: #  Returns:
        !          1721: #    1    - Continue processing.
        !          1722: #    0    - Exit the server.
        !          1723: #
        !          1724: sub GetProfileKeys {
        !          1725:    my $cmd       = shift;
        !          1726:    my $tail      = shift;
        !          1727:    my $client    = shift;
        !          1728:    my $userinput = "$cmd:$tail";
        !          1729: 
        !          1730:    my ($udom,$uname,$namespace)=split(/:/,$tail);
        !          1731:    $namespace=~s/\//\_/g;
        !          1732:    $namespace=~s/\W//g;
        !          1733:    my $proname=propath($udom,$uname);
        !          1734:    my $qresult='';
        !          1735:    my %hash;
        !          1736:    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
        !          1737:       foreach my $key (keys %hash) {
        !          1738:           $qresult.="$key&";
        !          1739:       }
        !          1740:       if (untie(%hash)) {
        !          1741:          $qresult=~s/\&$//;
        !          1742:          Reply($client, "$qresult\n", $userinput);
        !          1743:       } else {
        !          1744:          Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1745:                           "while attempting keys\n", $userinput);
        !          1746:       }
        !          1747:    } else {
        !          1748:       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1749:                         "while attempting keys\n", $userinput);
        !          1750:    }
        !          1751:    
        !          1752:    return 1;
        !          1753: }
        !          1754: RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0);
        !          1755: #
        !          1756: #   Dump the contents of a user profile database.
        !          1757: #   Note that this constitutes a very large covert channel too since
        !          1758: #   the dump will return sensitive information that is not encrypted.
        !          1759: #   The naive security assumption is that the session negotiation ensures
        !          1760: #   our client is trusted and I don't believe that's assured at present.
        !          1761: #   Sure want badly to go to ssl or tls.  Of course if my peer isn't really
        !          1762: #   a LonCAPA node they could have negotiated an encryption key too so >sigh<.
        !          1763: # 
        !          1764: #  Parameters:
        !          1765: #     $cmd           - The command request keyword (currentdump).
        !          1766: #     $tail          - Remainder of the request, consisting of a colon
        !          1767: #                      separated list that has the domain/username and
        !          1768: #                      the namespace to dump (database file).
        !          1769: #     $client        - file open on the remote client.
        !          1770: # Returns:
        !          1771: #     1    - Continue processing.
        !          1772: #     0    - Exit the server.
        !          1773: #
        !          1774: sub DumpProfileDatabase {
        !          1775:    my $cmd       = shift;
        !          1776:    my $tail      = shift;
        !          1777:    my $client    = shift;
        !          1778:    my $userinput = "$cmd:$tail";
        !          1779:    
        !          1780:    my ($udom,$uname,$namespace) = split(/:/,$tail);
        !          1781:    $namespace=~s/\//\_/g;
        !          1782:    $namespace=~s/\W//g;
        !          1783:    my $qresult='';
        !          1784:    my $proname=propath($udom,$uname);
        !          1785:    my %hash;
        !          1786:    if (tie(%hash,'GDBM_File',"$proname/$namespace.db", &GDBM_READER(),0640)) {
        !          1787:       # Structure of %data:
        !          1788:       # $data{$symb}->{$parameter}=$value;
        !          1789:       # $data{$symb}->{'v.'.$parameter}=$version;
        !          1790:       # since $parameter will be unescaped, we do not
        !          1791:       # have to worry about silly parameter names...
        !          1792:       my %data = ();                     # A hash of anonymous hashes..
        !          1793:       while (my ($key,$value) = each(%hash)) {
        !          1794:          my ($v,$symb,$param) = split(/:/,$key);
        !          1795:          next if ($v eq 'version' || $symb eq 'keys');
        !          1796:          next if (exists($data{$symb}) && 
        !          1797:                   exists($data{$symb}->{$param}) &&
        !          1798:                   $data{$symb}->{'v.'.$param} > $v);
        !          1799:          $data{$symb}->{$param}=$value;
        !          1800:          $data{$symb}->{'v.'.$param}=$v;
        !          1801:       }
        !          1802:       if (untie(%hash)) {
        !          1803:          while (my ($symb,$param_hash) = each(%data)) {
        !          1804:             while(my ($param,$value) = each (%$param_hash)){
        !          1805:                next if ($param =~ /^v\./);       # Ignore versions...
        !          1806:                #
        !          1807:                #   Just dump the symb=value pairs separated by &
        !          1808:                #
        !          1809:                $qresult.=$symb.':'.$param.'='.$value.'&';
        !          1810:             }
        !          1811:          }
        !          1812:          chop($qresult);
        !          1813:          Reply($client , "$qresult\n", $userinput);
        !          1814:       } else {
        !          1815:          Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1816:                            "while attempting currentdump\n", $userinput);
        !          1817:       }
        !          1818:    } else {
        !          1819:       Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1820:                         "while attempting currentdump\n", $userinput);
        !          1821:    }
        !          1822: 
        !          1823:    return 1;
        !          1824: }
        !          1825: RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0);
        !          1826: #
        !          1827: #   Dump a profile database with an optional regular expression
        !          1828: #   to match against the keys.  In this dump, no effort is made
        !          1829: #   to separate symb from version information. Presumably the
        !          1830: #   databases that are dumped by this command are of a different
        !          1831: #   structure.  Need to look at this and improve the documentation of
        !          1832: #   both this and the currentdump handler.
        !          1833: # Parameters:
        !          1834: #    $cmd                     - The command keyword.
        !          1835: #    $tail                    - All of the characters after the $cmd:
        !          1836: #                               These are expected to be a colon
        !          1837: #                               separated list containing:
        !          1838: #                               domain/user - identifying the user.
        !          1839: #                               namespace   - identifying the database.
        !          1840: #                               regexp      - optional regular expression
        !          1841: #                                             that is matched against
        !          1842: #                                             database keywords to do
        !          1843: #                                             selective dumps.
        !          1844: #   $client                   - Channel open on the client.
        !          1845: # Returns:
        !          1846: #    1    - Continue processing.
        !          1847: # Side effects:
        !          1848: #    response is written to $client.
        !          1849: #
        !          1850: sub DumpWithRegexp {
        !          1851:   my $cmd    = shift;
        !          1852:   my $tail   = shift;
        !          1853:   my $client = shift;
        !          1854: 
        !          1855:   my $userinput = "$cmd:$tail";
        !          1856: 
        !          1857:   my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
        !          1858:   $namespace=~s/\//\_/g;
        !          1859:   $namespace=~s/\W//g;
        !          1860:   if (defined($regexp)) {
        !          1861:     $regexp=&unescape($regexp);
        !          1862:   } else {
        !          1863:     $regexp='.';
        !          1864:   }
        !          1865:   my $qresult='';
        !          1866:   my $proname=propath($udom,$uname);
        !          1867:   my %hash;
        !          1868:   if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
        !          1869: 	  &GDBM_READER(),0640)) {
        !          1870:     study($regexp);
        !          1871:     while (my ($key,$value) = each(%hash)) {
        !          1872:       if ($regexp eq '.') {
        !          1873: 	$qresult.=$key.'='.$value.'&';
        !          1874:       } else {
        !          1875: 	my $unescapeKey = &unescape($key);
        !          1876: 	if (eval('$unescapeKey=~/$regexp/')) {
        !          1877: 	  $qresult.="$key=$value&";
        !          1878: 	}
        !          1879:       }
        !          1880:     }
        !          1881:     if (untie(%hash)) {
        !          1882:       chop($qresult);
        !          1883:       Reply($client, "$qresult\n", $userinput);
        !          1884:     } else {
        !          1885:       Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1886: 	       "while attempting dump\n", $userinput);
        !          1887:     }
        !          1888:   } else {
        !          1889:     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1890: 	    "while attempting dump\n", $userinput);
        !          1891:   }
        !          1892: 
        !          1893:     return 1;
        !          1894: }
        !          1895: RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0);
        !          1896: 
        !          1897: #  Store an aitem in any database but the roles database.
        !          1898: #
        !          1899: #  Parameters:
        !          1900: #    $cmd                - Request command keyword.
        !          1901: #    $tail               - Tail of the request.  This is a colon
        !          1902: #                          separated list containing:
        !          1903: #                          domain/user - User and authentication domain.
        !          1904: #                          namespace   - Name of the database being modified
        !          1905: #                          rid         - Resource keyword to modify.
        !          1906: #                          what        - new value associated with rid.
        !          1907: #
        !          1908: #    $client             - Socket open on the client.
        !          1909: #
        !          1910: #
        !          1911: #  Returns:
        !          1912: #      1 (keep on processing).
        !          1913: #  Side-Effects:
        !          1914: #    Writes to the client
        !          1915: sub StoreHandler {
        !          1916:   my $cmd    = shift;
        !          1917:   my $tail   = shift;
        !          1918:   my $client = shift;
        !          1919:  
        !          1920:   my $userinput = "$cmd:$tail";
        !          1921: 
        !          1922:   my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
        !          1923:   $namespace=~s/\//\_/g;
        !          1924:   $namespace=~s/\W//g;
        !          1925:   if ($namespace ne 'roles') {
        !          1926:     chomp($what);
        !          1927:     my $proname=propath($udom,$uname);
        !          1928:     my $now=time;
        !          1929:     unless ($namespace=~/^nohist\_/) {
        !          1930:       my $hfh;
        !          1931:       if ($hfh=IO::File->new(">>$proname/$namespace.hist")) {
        !          1932: 	print $hfh "P:$now:$rid:$what\n"; 
        !          1933:       }
        !          1934:     }
        !          1935:     my @pairs=split(/\&/,$what);
        !          1936:     my %hash;
        !          1937:     if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
        !          1938: 	    &GDBM_WRCREAT(),0640)) {
        !          1939:       my @previouskeys=split(/&/,$hash{"keys:$rid"});
        !          1940:       my $key;
        !          1941:       $hash{"version:$rid"}++;
        !          1942:       my $version=$hash{"version:$rid"};
        !          1943:       my $allkeys=''; 
        !          1944:       foreach my $pair (@pairs) {
        !          1945: 	my ($key,$value)=split(/=/,$pair);
        !          1946: 	$allkeys.=$key.':';
        !          1947: 	$hash{"$version:$rid:$key"}=$value;
        !          1948:       }
        !          1949:       $hash{"$version:$rid:timestamp"}=$now;
        !          1950:       $allkeys.='timestamp';
        !          1951:       $hash{"$version:keys:$rid"}=$allkeys;
        !          1952:       if (untie(%hash)) {
        !          1953: 	Reply($client, "ok\n", $userinput);
        !          1954:       } else {
        !          1955: 	Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          1956: 		"while attempting store\n", $userinput);
        !          1957:       }
        !          1958:     } else {
        !          1959:       Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          1960: 	       "while attempting store\n", $userinput);
        !          1961:     }
        !          1962:   } else {
        !          1963:     Failure($client, "refused\n", $userinput);
        !          1964:   }
        !          1965: 
        !          1966:   return 1;
        !          1967: }
        !          1968: RegisterHandler("store", \&StoreHandler, 0, 1, 0);
        !          1969: #
        !          1970: #   Restore a prior version of a resource.
        !          1971: #
        !          1972: #  Parameters:
        !          1973: #     $cmd               - Command keyword.
        !          1974: #     $tail              - Remainder of the request which consists of:
        !          1975: #                          domain/user   - User and auth. domain.
        !          1976: #                          namespace     - name of resource database.
        !          1977: #                          rid           - Resource id.
        !          1978: #    $client             - socket open on the client.
        !          1979: #
        !          1980: # Returns:
        !          1981: #      1  indicating the caller should not yet exit.
        !          1982: # Side-effects:
        !          1983: #   Writes a reply to the client.
        !          1984: #
        !          1985: sub RestoreHandler {
        !          1986:   my $cmd     = shift;
        !          1987:   my $tail    = shift;
        !          1988:   my $client  = shift;
        !          1989: 
        !          1990:   my $userinput = "$cmd:$tail";	# Only used for logging purposes.
        !          1991: 
        !          1992:   my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
        !          1993:   $namespace=~s/\//\_/g;
        !          1994:   $namespace=~s/\W//g;
        !          1995:   chomp($rid);
        !          1996:   my $proname=propath($udom,$uname);
        !          1997: 	  my $qresult='';
        !          1998:   my %hash;
        !          1999:   if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
        !          2000: 	  &GDBM_READER(),0640)) {
        !          2001:     my $version=$hash{"version:$rid"};
        !          2002:     $qresult.="version=$version&";
        !          2003:     my $scope;
        !          2004:     for ($scope=1;$scope<=$version;$scope++) {
        !          2005:       my $vkeys=$hash{"$scope:keys:$rid"};
        !          2006: 		my @keys=split(/:/,$vkeys);
        !          2007:       my $key;
        !          2008:       $qresult.="$scope:keys=$vkeys&";
        !          2009:       foreach $key (@keys) {
        !          2010: 	$qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
        !          2011:       }                                  
        !          2012:     }
        !          2013: 	     if (untie(%hash)) {
        !          2014: 	       $qresult=~s/\&$//;
        !          2015: 	       Reply( $client, "$qresult\n", $userinput);
        !          2016: 	     } else {
        !          2017: 	       Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          2018: 		       "while attempting restore\n", $userinput);
        !          2019: 	     }
        !          2020:   } else {
        !          2021:     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          2022: 	    "while attempting restore\n", $userinput);
        !          2023:   }
        !          2024:   
        !          2025:   return 1;
        !          2026: 
        !          2027: 
        !          2028: }
        !          2029: RegisterHandler("restor", \&RestoreHandler, 0,1,0);
        !          2030: 
        !          2031: #
        !          2032: #   Add a chat message to to a discussion board.
        !          2033: #
        !          2034: # Parameters:
        !          2035: #    $cmd                - Request keyword.
        !          2036: #    $tail               - Tail of the command. A colon separated list
        !          2037: #                          containing:
        !          2038: #                          cdom    - Domain on which the chat board lives
        !          2039: #                          cnum    - Identifier of the discussion group.
        !          2040: #                          post    - Body of the posting.
        !          2041: #   $client              - Socket open on the client.
        !          2042: # Returns:
        !          2043: #   1    - Indicating caller should keep on processing.
        !          2044: #
        !          2045: # Side-effects:
        !          2046: #   writes a reply to the client.
        !          2047: #
        !          2048: #
        !          2049: sub SendChatHandler {
        !          2050:   my $cmd     = shift;
        !          2051:   my $tail    = shift;
        !          2052:   my $client  = shift;
        !          2053: 
        !          2054:   my $userinput = "$cmd:$tail";
        !          2055: 
        !          2056:   my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
        !          2057:   &chatadd($cdom,$cnum,$newpost);
        !          2058:   Reply($client, "ok\n", $userinput);
        !          2059: 
        !          2060:   return 1;
        !          2061: }
        !          2062: RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0);
        !          2063: #
        !          2064: #   Retrieve the set of chat messagss from a discussion board.
        !          2065: #
        !          2066: #  Parameters:
        !          2067: #    $cmd             - Command keyword that initiated the request.
        !          2068: #    $tail            - Remainder of the request after the command
        !          2069: #                       keyword.  In this case a colon separated list of
        !          2070: #                       chat domain    - Which discussion board.
        !          2071: #                       chat id        - Discussion thread(?)
        !          2072: #                       domain/user    - Authentication domain and username
        !          2073: #                                        of the requesting person.
        !          2074: #   $client           - Socket open on the client program.
        !          2075: # Returns:
        !          2076: #    1     - continue processing
        !          2077: # Side effects:
        !          2078: #    Response is written to the client.
        !          2079: #
        !          2080: sub RetrieveChatHandler {
        !          2081:   my $cmd      = shift;
        !          2082:   my $tail     = shift;
        !          2083:   my $client   = shift;
        !          2084: 
        !          2085:   my $userinput = "$cmd:$tail";
        !          2086: 
        !          2087:   my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
        !          2088:   my $reply='';
        !          2089:   foreach (&getchat($cdom,$cnum,$udom,$uname)) {
        !          2090:     $reply.=&escape($_).':';
        !          2091:   }
        !          2092:   $reply=~s/\:$//;
        !          2093:   Reply($client, $reply."\n", $userinput);
        !          2094: 
        !          2095: 
        !          2096:   return 1;
        !          2097: }
        !          2098: RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0);
        !          2099: #
        !          2100: #  Initiate a query of an sql database.  SQL query repsonses get put in
        !          2101: #  a file for later retrieval.  This prevents sql query results from
        !          2102: #  bottlenecking the system.  Note that with loncnew, perhaps this is
        !          2103: #  less of an issue since multiple outstanding requests can be concurrently
        !          2104: #  serviced.
        !          2105: #
        !          2106: #  Parameters:
        !          2107: #     $cmd       - COmmand keyword that initiated the request.
        !          2108: #     $tail      - Remainder of the command after the keyword.
        !          2109: #                  For this function, this consists of a query and
        !          2110: #                  3 arguments that are self-documentingly labelled
        !          2111: #                  in the original arg1, arg2, arg3.
        !          2112: #     $client    - Socket open on the client.
        !          2113: # Return:
        !          2114: #    1   - Indicating processing should continue.
        !          2115: # Side-effects:
        !          2116: #    a reply is written to $client.
        !          2117: #
        !          2118: sub SendQueryHandler {
        !          2119:   my $cmd     = shift;
        !          2120:   my $tail    = shift;
        !          2121:   my $client  = shift;
        !          2122: 
        !          2123:   my $userinput = "$cmd:$tail";
        !          2124: 
        !          2125:   my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
        !          2126:   $query=~s/\n*$//g;
        !          2127:   Reply($client, "". sqlreply("$clientname\&$query".
        !          2128: 			      "\&$arg1"."\&$arg2"."\&$arg3")."\n",
        !          2129: 	$userinput);
        !          2130: 
        !          2131:   return 1;
        !          2132: }
        !          2133: RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0);
        !          2134: 
        !          2135: #
        !          2136: #   Add a reply to an sql query.  SQL queries are done asyncrhonously.
        !          2137: #   The query is submitted via a "querysend" transaction.
        !          2138: #   There it is passed on to the lonsql daemon, queued and issued to
        !          2139: #   mysql.
        !          2140: #     This transaction is invoked when the sql transaction is complete
        !          2141: #   it stores the query results in flie and indicates query completion.
        !          2142: #   presumably local software then fetches this response... I'm guessing
        !          2143: #   the sequence is: lonc does a querysend, we ask lonsql to do it.
        !          2144: #   lonsql on completion of the query interacts with the lond of our
        !          2145: #   client to do a query reply storing two files:
        !          2146: #    - id     - The results of the query.
        !          2147: #    - id.end - Indicating the transaction completed. 
        !          2148: #    NOTE: id is a unique id assigned to the query and querysend time.
        !          2149: # Parameters:
        !          2150: #    $cmd        - Command keyword that initiated this request.
        !          2151: #    $tail       - Remainder of the tail.  In this case that's a colon
        !          2152: #                  separated list containing the query Id and the 
        !          2153: #                  results of the query.
        !          2154: #    $client     - Socket open on the client.
        !          2155: # Return:
        !          2156: #    1           - Indicating that we should continue processing.
        !          2157: # Side effects:
        !          2158: #    ok written to the client.
        !          2159: #
        !          2160: sub ReplyQueryHandler {
        !          2161:   my $cmd    = shift;
        !          2162:   my $tail   = shift;
        !          2163:   my $client = shift;
        !          2164: 
        !          2165:   my $userinput = "$cmd:$tail";
        !          2166: 
        !          2167:   my ($cmd,$id,$reply)=split(/:/,$userinput); 
        !          2168:   my $store;
        !          2169:   my $execdir=$perlvar{'lonDaemons'};
        !          2170:   if ($store=IO::File->new(">$execdir/tmp/$id")) {
        !          2171:     $reply=~s/\&/\n/g;
        !          2172:          print $store $reply;
        !          2173:     close $store;
        !          2174:     my $store2=IO::File->new(">$execdir/tmp/$id.end");
        !          2175:     print $store2 "done\n";
        !          2176:     close $store2;
        !          2177:     Reply($client, "ok\n", $userinput);
        !          2178:   }
        !          2179:   else {
        !          2180:     Failure($client, "error: ".($!+0)
        !          2181: 	    ." IO::File->new Failed ".
        !          2182: 	    "while attempting queryreply\n", $userinput);
        !          2183:   }
        !          2184:  
        !          2185: 
        !          2186:   return 1;
        !          2187: }
        !          2188: RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0);
        !          2189: #
        !          2190: #  Process the courseidput query.  Not quite sure what this means
        !          2191: #  at the system level sense.  It appears a gdbm file in the 
        !          2192: #  /home/httpd/lonUsers/$domain/nohist_courseids is tied and
        !          2193: #  a set of entries made in that database.
        !          2194: #
        !          2195: # Parameters:
        !          2196: #   $cmd      - The command keyword that initiated this request.
        !          2197: #   $tail     - Tail of the command.  In this case consists of a colon
        !          2198: #               separated list contaning the domain to apply this to and
        !          2199: #               an ampersand separated list of keyword=value pairs.
        !          2200: #   $client   - Socket open on the client.
        !          2201: # Returns:
        !          2202: #   1    - indicating that processing should continue
        !          2203: #
        !          2204: # Side effects:
        !          2205: #   reply is written to the client.
        !          2206: #
        !          2207: sub PutCourseIdHandler {
        !          2208:   my $cmd    = shift;
        !          2209:   my $tail   = shift;
        !          2210:   my $client = shift;
        !          2211: 
        !          2212:   my $userinput = "$cmd:$tail";
        !          2213: 
        !          2214:   my ($udom,$what)=split(/:/,$tail);
        !          2215:   chomp($what);
        !          2216:   $udom=~s/\W//g;
        !          2217:   my $proname=
        !          2218:     "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
        !          2219:   my $now=time;
        !          2220:   my @pairs=split(/\&/,$what);
        !          2221:   my %hash;
        !          2222:   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
        !          2223:     foreach my $pair (@pairs) {
        !          2224:       my ($key,$value)=split(/=/,$pair);
        !          2225:       $hash{$key}=$value.':'.$now;
        !          2226:     }
        !          2227:     if (untie(%hash)) {
        !          2228:       Reply($client, "ok\n", $userinput);
        !          2229:     } else {
        !          2230:       Failure( $client, "error: ".($!+0)
        !          2231: 	       ." untie(GDBM) Failed ".
        !          2232: 	       "while attempting courseidput\n", $userinput);
        !          2233:     }
        !          2234:   } else {
        !          2235:     Failure( $client, "error: ".($!+0)
        !          2236: 	     ." tie(GDBM) Failed ".
        !          2237: 	     "while attempting courseidput\n", $userinput);
        !          2238:   }
        !          2239: 
        !          2240:   return 1;
        !          2241: }
        !          2242: RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0);
        !          2243: 
        !          2244: #  Retrieves the value of a course id resource keyword pattern
        !          2245: #  defined since a starting date.  Both the starting date and the
        !          2246: #  keyword pattern are optional.  If the starting date is not supplied it
        !          2247: #  is treated as the beginning of time.  If the pattern is not found,
        !          2248: #  it is treatred as "." matching everything.
        !          2249: #
        !          2250: #  Parameters:
        !          2251: #     $cmd     - Command keyword that resulted in us being dispatched.
        !          2252: #     $tail    - The remainder of the command that, in this case, consists
        !          2253: #                of a colon separated list of:
        !          2254: #                 domain   - The domain in which the course database is 
        !          2255: #                            defined.
        !          2256: #                 since    - Optional parameter describing the minimum
        !          2257: #                            time of definition(?) of the resources that
        !          2258: #                            will match the dump.
        !          2259: #                 description - regular expression that is used to filter
        !          2260: #                            the dump.  Only keywords matching this regexp
        !          2261: #                            will be used.
        !          2262: #     $client  - The socket open on the client.
        !          2263: # Returns:
        !          2264: #    1     - Continue processing.
        !          2265: # Side Effects:
        !          2266: #   a reply is written to $client.
        !          2267: sub DumpCourseIdHandler {
        !          2268:   my $cmd    = shift;
        !          2269:   my $tail   = shift;
        !          2270:   my $client = shift;
        !          2271: 
        !          2272:   my $userinput = "$cmd:$tail";
        !          2273: 
        !          2274:   my ($udom,$since,$description) =split(/:/,$tail);
        !          2275:   if (defined($description)) {
        !          2276:     $description=&unescape($description);
        !          2277:   } else {
        !          2278:     $description='.';
        !          2279:   }
        !          2280:   unless (defined($since)) { $since=0; }
        !          2281:   my $qresult='';
        !          2282:   my $proname = "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
        !          2283:   my %hash;
        !          2284:   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
        !          2285:     while (my ($key,$value) = each(%hash)) {
        !          2286:       my ($descr,$lasttime)=split(/\:/,$value);
        !          2287:       if ($lasttime<$since) { 
        !          2288: 	next; 
        !          2289:       }
        !          2290:       if ($description eq '.') {
        !          2291: 	$qresult.=$key.'='.$descr.'&';
        !          2292:       } else {
        !          2293: 	my $unescapeVal = &unescape($descr);
        !          2294: 	if (eval('$unescapeVal=~/$description/i')) {
        !          2295: 	  $qresult.="$key=$descr&";
        !          2296: 	}
        !          2297:       }
        !          2298:     }
        !          2299:     if (untie(%hash)) {
        !          2300:       chop($qresult);
        !          2301:       Reply($client, "$qresult\n", $userinput);
        !          2302:     } else {
        !          2303:       Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          2304: 	      "while attempting courseiddump\n", $userinput);
        !          2305:     }
        !          2306:   } else {
        !          2307:     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          2308: 	    "while attempting courseiddump\n", $userinput);
        !          2309:   }
        !          2310: 
        !          2311: 
        !          2312:   return 1;
        !          2313: }
        !          2314: RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);
        !          2315: #
        !          2316: #  Puts an id to a domains id database. 
        !          2317: #
        !          2318: #  Parameters:
        !          2319: #   $cmd     - The command that triggered us.
        !          2320: #   $tail    - Remainder of the request other than the command. This is a 
        !          2321: #              colon separated list containing:
        !          2322: #              $domain  - The domain for which we are writing the id.
        !          2323: #              $pairs  - The id info to write... this is and & separated list
        !          2324: #                        of keyword=value.
        !          2325: #   $client  - Socket open on the client.
        !          2326: #  Returns:
        !          2327: #    1   - Continue processing.
        !          2328: #  Side effects:
        !          2329: #     reply is written to $client.
        !          2330: #
        !          2331: sub PutIdHandler {
        !          2332:   my $cmd    = shift;
        !          2333:   my $tail   = shift;
        !          2334:   my $client = shift;
        !          2335: 
        !          2336:   my $userinput = "$cmd:$tail";
        !          2337: 
        !          2338:   my ($udom,$what)=split(/:/,$tail);
        !          2339:   chomp($what);
        !          2340:   $udom=~s/\W//g;
        !          2341:   my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
        !          2342:   my $now=time;
        !          2343:   {
        !          2344:     my $hfh;
        !          2345:     if ($hfh=IO::File->new(">>$proname.hist")) { 
        !          2346:       print $hfh "P:$now:$what\n"; 
        !          2347:     }
        !          2348:   }
        !          2349:   my @pairs=split(/\&/,$what);
        !          2350:   my %hash;
        !          2351:   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
        !          2352:     foreach my $pair (@pairs) {
        !          2353:       my ($key,$value)=split(/=/,$pair);
        !          2354:       $hash{$key}=$value;
        !          2355:     }
        !          2356:     if (untie(%hash)) {
        !          2357:       Reply($client, "ok\n", $userinput);
        !          2358:     } else {
        !          2359:       Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          2360: 	      "while attempting idput\n", $userinput);
        !          2361:     }
        !          2362:   } else {
        !          2363:     Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          2364: 	     "while attempting idput\n", $userinput);
        !          2365:   }
        !          2366: 
        !          2367:   return 1;
        !          2368: }
        !          2369: 
        !          2370: RegisterHandler("idput", \&PutIdHandler, 0, 1, 0);
        !          2371: #
        !          2372: #  Retrieves a set of id values from the id database.
        !          2373: #  Returns an & separated list of results, one for each requested id to the
        !          2374: #  client.
        !          2375: #
        !          2376: # Parameters:
        !          2377: #   $cmd       - Command keyword that caused us to be dispatched.
        !          2378: #   $tail      - Tail of the command.  Consists of a colon separated:
        !          2379: #               domain - the domain whose id table we dump
        !          2380: #               ids      Consists of an & separated list of
        !          2381: #                        id keywords whose values will be fetched.
        !          2382: #                        nonexisting keywords will have an empty value.
        !          2383: #   $client    - Socket open on the client.
        !          2384: #
        !          2385: # Returns:
        !          2386: #    1 - indicating processing should continue.
        !          2387: # Side effects:
        !          2388: #   An & separated list of results is written to $client.
        !          2389: #
        !          2390: sub GetIdHandler {
        !          2391:   my $cmd    = shift;
        !          2392:   my $tail   = shift;
        !          2393:   my $client = shift;
        !          2394: 
        !          2395:   my $userinput = "$client:$tail";
        !          2396: 
        !          2397:   my ($udom,$what)=split(/:/,$tail);
        !          2398:   chomp($what);
        !          2399:   $udom=~s/\W//g;
        !          2400:   my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
        !          2401:   my @queries=split(/\&/,$what);
        !          2402:   my $qresult='';
        !          2403:   my %hash;
        !          2404:   if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
        !          2405:     for (my $i=0;$i<=$#queries;$i++) {
        !          2406:       $qresult.="$hash{$queries[$i]}&";
        !          2407:     }
        !          2408:     if (untie(%hash)) {
        !          2409:       $qresult=~s/\&$//;
        !          2410:       Reply($client, "$qresult\n", $userinput);
        !          2411:     } else {
        !          2412:       Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
        !          2413: 	       "while attempting idget\n",$userinput);
        !          2414:     }
        !          2415:   } else {
        !          2416:     Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
        !          2417:                         "while attempting idget\n",$userinput);
        !          2418:   }
        !          2419: 
        !          2420:   return 1;
        !          2421: }
        !          2422: RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);
        !          2423: #------------------------------------------------------------------------------------
        !          2424: #
        !          2425: #   Process a Request.  Takes a request from the client validates
        !          2426: #   it and performs the operation requested by it.  Returns
        !          2427: #   a response to the client.
        !          2428: #
        !          2429: #  Parameters:
        !          2430: #      request      - A string containing the user's request.
        !          2431: #  Returns:
        !          2432: #      0            - Requested to exit, caller should shut down.
        !          2433: #      1            - Accept additional requests from the client.
        !          2434: #
        !          2435: sub ProcessRequest {
        !          2436:    my $Request      = shift;
        !          2437:    my $KeepGoing    = 1;	# Assume we're not asked to stop.
        !          2438:     
        !          2439:    my $wasenc=0;
        !          2440:    my $userinput = $Request;   # for compatibility with oldcode <yeach>
        !          2441: 
        !          2442: 
        !          2443: # ------------------------------------------------------------ See if encrypted
        !          2444:    
        !          2445:    if($userinput =~ /^enc/) {
        !          2446:       $wasenc = 1;
        !          2447:       $userinput = Decipher($userinput);
        !          2448:       if(! $userinput) {
        !          2449:          Failure($client,"error:Encrypted data without negotiating key");
        !          2450:          return 0;                      # Break off with this imposter.
        !          2451:       }
        !          2452:    }
        !          2453:    # Split off the request keyword from the rest of the stuff.
        !          2454:    
        !          2455:    my ($command, $tail) = split(/:/, $userinput, 2);
        !          2456:    
        !          2457:    
        !          2458: # ------------------------------------------------------------- Normal commands
        !          2459: 
        !          2460:    # 
        !          2461:    #   If the command is in the hash, then execute it via the hash dispatch:
        !          2462:    #
        !          2463:    if(defined $Dispatcher{$command}) {
        !          2464: 
        !          2465:       my $DispatchInfo = $Dispatcher{$command};
        !          2466:       my $Handler      = $$DispatchInfo[0];
        !          2467:       my $NeedEncode   = $$DispatchInfo[1];
        !          2468:       my $ClientTypes  = $$DispatchInfo[2];
        !          2469:       
        !          2470:       #  Validate the request:
        !          2471:       
        !          2472:       my $ok = 1;
        !          2473:       if($NeedEncode && (!$wasenc)) {
        !          2474:          Reply($client, "refused\n", $userinput);
        !          2475:          $ok = 0;
        !          2476:       }
        !          2477:       if(isClient && (($ClientTypes & $CLIENT_OK) == 0)) {
        !          2478:          Reply($client, "refused\n", $userinput);
        !          2479:          $ok = 0;
        !          2480:       }
        !          2481:       if(isManager && (($ClientTypes & $MANAGER_OK) == 0)) {
        !          2482:          Reply($client, "refused\n", $userinput);
        !          2483:          $ok = 0;
        !          2484:       }
        !          2485:       if($ok) {
        !          2486:          $KeepGoing = &$Handler($command, $tail, $client);
        !          2487:       }
1.161     foxr     2488: 
                   2489: 
                   2490: 
                   2491: 
1.134     albertel 2492: 
1.178.2.1! foxr     2493: # ---------------------------------------------------------------------- tmpput
        !          2494:    } elsif ($userinput =~ /^tmpput/) {
        !          2495:       if(isClient) {
        !          2496:          my ($cmd,$what)=split(/:/,$userinput);
        !          2497:          my $store;
        !          2498:          $tmpsnum++;
        !          2499:          my $id=$$.'_'.$clientip.'_'.$tmpsnum;
        !          2500:          $id=~s/\W/\_/g;
        !          2501:          $what=~s/\n//g;
        !          2502:          my $execdir=$perlvar{'lonDaemons'};
        !          2503:          if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
        !          2504:             print $store $what;
        !          2505:             close $store;
        !          2506:             Reply($client, "$id\n", $userinput);
        !          2507:          }
        !          2508:          else {
        !          2509:             Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
        !          2510:                            "while attempting tmpput\n", $userinput);
        !          2511:          }
        !          2512:       } else {
        !          2513:          Failure($client, "refused\n", $userinput);
        !          2514: 	    
        !          2515:       }
        !          2516: 	
        !          2517: # ---------------------------------------------------------------------- tmpget
        !          2518:    } elsif ($userinput =~ /^tmpget/) {
        !          2519:       if(isClient) {
        !          2520:          my ($cmd,$id)=split(/:/,$userinput);
        !          2521:          chomp($id);
        !          2522:          $id=~s/\W/\_/g;
        !          2523:          my $store;
        !          2524:          my $execdir=$perlvar{'lonDaemons'};
        !          2525:          if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
        !          2526:             my $reply=<$store>;
        !          2527:             Reply( $client, "$reply\n", $userinput);
        !          2528:             close $store;
        !          2529:          }
        !          2530:          else {
        !          2531:             Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
        !          2532:                                "while attempting tmpget\n", $userinput);
        !          2533:          }
        !          2534:       } else {
        !          2535:          Failure($client, "refused\n", $userinput);
        !          2536: 	    
        !          2537:       }
        !          2538: # ---------------------------------------------------------------------- tmpdel
        !          2539:    } elsif ($userinput =~ /^tmpdel/) {
        !          2540:       if(isClient) {
        !          2541:          my ($cmd,$id)=split(/:/,$userinput);
        !          2542:          chomp($id);
        !          2543:          $id=~s/\W/\_/g;
        !          2544:          my $execdir=$perlvar{'lonDaemons'};
        !          2545:          if (unlink("$execdir/tmp/$id.tmp")) {
        !          2546:             Reply($client, "ok\n", $userinput);
        !          2547:          } else {
        !          2548:             Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
        !          2549:                                  "while attempting tmpdel\n", $userinput);
        !          2550:          }
        !          2551:       } else {
        !          2552:          Failure($client, "refused\n", $userinput);
        !          2553:       }
        !          2554: # -------------------------------------------------------------------------- ls
        !          2555:    } elsif ($userinput =~ /^ls/) {
        !          2556:       if(isClient) {
        !          2557:          my ($cmd,$ulsdir)=split(/:/,$userinput);
        !          2558:          my $ulsout='';
        !          2559:          my $ulsfn;
        !          2560:          if (-e $ulsdir) {
        !          2561:             if(-d $ulsdir) {
        !          2562:                if (opendir(LSDIR,$ulsdir)) {
        !          2563:                   while ($ulsfn=readdir(LSDIR)) {
        !          2564:                      my @ulsstats=stat($ulsdir.'/'.$ulsfn);
        !          2565:                      $ulsout.=$ulsfn.'&'.
        !          2566:                      join('&',@ulsstats).':';
        !          2567:                   }
        !          2568:                   closedir(LSDIR);
        !          2569:                }
        !          2570:             } else {
        !          2571:                my @ulsstats=stat($ulsdir);
        !          2572:                $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
        !          2573:             }
        !          2574:          } else {
        !          2575:             $ulsout='no_such_dir';
        !          2576:          }
        !          2577:          if ($ulsout eq '') { $ulsout='empty'; }
        !          2578:          Reply($client, "$ulsout\n", $userinput);
        !          2579:       } else {
        !          2580:          Failure($client, "refused\n", $userinput);
        !          2581: 	    
        !          2582:       }
        !          2583: # ----------------------------------------------------------------- setannounce
        !          2584:    } elsif ($userinput =~ /^setannounce/) {
        !          2585:       if (isClient) {
        !          2586:          my ($cmd,$announcement)=split(/:/,$userinput);
        !          2587:          chomp($announcement);
        !          2588:          $announcement=&unescape($announcement);
        !          2589:          if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
        !          2590:                                              '/announcement.txt')) {
        !          2591:             print $store $announcement;
        !          2592:             close $store;
        !          2593:             Reply($client, "ok\n", $userinput);
        !          2594:          } else {
        !          2595:             Failure($client, "error: ".($!+0)."\n", $userinput);
        !          2596:          }
        !          2597:       } else {
        !          2598:          Failure($client, "refused\n", $userinput);
        !          2599: 	    
        !          2600:       }
        !          2601: # ------------------------------------------------------------------ Hanging up
        !          2602:    } elsif (($userinput =~ /^exit/) ||
        !          2603: 	         ($userinput =~ /^init/)) { # no restrictions.
        !          2604:       &logthis("Client $clientip ($clientname) hanging up: $userinput");
        !          2605:       Reply($client, "bye\n", $userinput);
        !          2606:       $client->shutdown(2);        # shutdown the socket forcibly.
        !          2607:       $client->close();
        !          2608:       $KeepGoing = 0;		# Flag to exit the program.
1.97      foxr     2609: 
1.178.2.1! foxr     2610: # ---------------------------------- set current host/domain
        !          2611:    } elsif ($userinput =~ /^sethost:/) {
        !          2612:       if (isClient) {
        !          2613:          Reply($client, &sethost($userinput)."\n", $userinput);
        !          2614:       } else {
        !          2615:          Failure($client, "refused\n", $userinput);
        !          2616:       }
        !          2617: #---------------------------------- request file (?) version.
        !          2618:     } elsif ($userinput =~/^version:/) {
        !          2619: 	if (isClient) {
        !          2620: 	    Reply($client, &version($userinput)."\n", $userinput);
        !          2621: 	} else {
        !          2622: 	    Reply( $client, "refused\n", $userinput);
        !          2623: 	}
        !          2624: # ------------------------------------------------------------- unknown command
1.97      foxr     2625: 
1.178.2.1! foxr     2626:    } else {
        !          2627: 	# unknown command
        !          2628:       Failure($client, "unknown_cmd\n", $userinput);
        !          2629:    }
1.97      foxr     2630: 
1.178.2.1! foxr     2631:     return $KeepGoing;
        !          2632: }
1.97      foxr     2633: 
1.96      foxr     2634: 
                   2635: #
1.140     foxr     2636: #   GetCertificate: Given a transaction that requires a certificate,
                   2637: #   this function will extract the certificate from the transaction
                   2638: #   request.  Note that at this point, the only concept of a certificate
                   2639: #   is the hostname to which we are connected.
                   2640: #
                   2641: #   Parameter:
                   2642: #      request   - The request sent by our client (this parameterization may
                   2643: #                  need to change when we really use a certificate granting
                   2644: #                  authority.
                   2645: #
                   2646: sub GetCertificate {
                   2647:     my $request = shift;
                   2648: 
                   2649:     return $clientip;
                   2650: }
1.161     foxr     2651: 
                   2652: 
                   2653: 
1.156     foxr     2654: #
                   2655: #   ReadManagerTable: Reads in the current manager table. For now this is
                   2656: #                     done on each manager authentication because:
                   2657: #                     - These authentications are not frequent
                   2658: #                     - This allows dynamic changes to the manager table
                   2659: #                       without the need to signal to the lond.
                   2660: #
                   2661: 
                   2662: sub ReadManagerTable {
                   2663: 
                   2664:     #   Clean out the old table first..
                   2665: 
1.166     foxr     2666:    foreach my $key (keys %managers) {
                   2667:       delete $managers{$key};
                   2668:    }
                   2669: 
                   2670:    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
                   2671:    if (!open (MANAGERS, $tablename)) {
                   2672:       logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
                   2673:       return;
                   2674:    }
                   2675:    while(my $host = <MANAGERS>) {
                   2676:       chomp($host);
                   2677:       if ($host =~ "^#") {                  # Comment line.
                   2678:          logthis('<font color="green"> Skipping line: '. "$host</font>\n");
                   2679:          next;
                   2680:       }
                   2681:       if (!defined $hostip{$host}) { # This is a non cluster member
1.161     foxr     2682: 	    #  The entry is of the form:
                   2683: 	    #    cluname:hostname
                   2684: 	    #  cluname - A 'cluster hostname' is needed in order to negotiate
                   2685: 	    #            the host key.
                   2686: 	    #  hostname- The dns name of the host.
                   2687: 	    #
1.166     foxr     2688:           my($cluname, $dnsname) = split(/:/, $host);
                   2689:           
                   2690:           my $ip = gethostbyname($dnsname);
                   2691:           if(defined($ip)) {                 # bad names don't deserve entry.
                   2692:             my $hostip = inet_ntoa($ip);
                   2693:             $managers{$hostip} = $cluname;
                   2694:             logthis('<font color="green"> registering manager '.
                   2695:                     "$dnsname as $cluname with $hostip </font>\n");
                   2696:          }
                   2697:       } else {
                   2698:          logthis('<font color="green"> existing host'." $host</font>\n");
                   2699:          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
                   2700:       }
                   2701:    }
1.156     foxr     2702: }
1.140     foxr     2703: 
                   2704: #
                   2705: #  ValidManager: Determines if a given certificate represents a valid manager.
                   2706: #                in this primitive implementation, the 'certificate' is
                   2707: #                just the connecting loncapa client name.  This is checked
                   2708: #                against a valid client list in the configuration.
                   2709: #
                   2710: #                  
                   2711: sub ValidManager {
                   2712:     my $certificate = shift; 
                   2713: 
1.163     foxr     2714:     return isManager;
1.140     foxr     2715: }
                   2716: #
1.143     foxr     2717: #  CopyFile:  Called as part of the process of installing a 
                   2718: #             new configuration file.  This function copies an existing
                   2719: #             file to a backup file.
                   2720: # Parameters:
                   2721: #     oldfile  - Name of the file to backup.
                   2722: #     newfile  - Name of the backup file.
                   2723: # Return:
                   2724: #     0   - Failure (errno has failure reason).
                   2725: #     1   - Success.
                   2726: #
                   2727: sub CopyFile {
                   2728:     my $oldfile = shift;
                   2729:     my $newfile = shift;
                   2730: 
                   2731:     #  The file must exist:
                   2732: 
                   2733:     if(-e $oldfile) {
                   2734: 
                   2735: 	 # Read the old file.
                   2736: 
                   2737: 	my $oldfh = IO::File->new("< $oldfile");
                   2738: 	if(!$oldfh) {
                   2739: 	    return 0;
                   2740: 	}
                   2741: 	my @contents = <$oldfh>;  # Suck in the entire file.
                   2742: 
                   2743: 	# write the backup file:
                   2744: 
                   2745: 	my $newfh = IO::File->new("> $newfile");
                   2746: 	if(!(defined $newfh)){
                   2747: 	    return 0;
                   2748: 	}
                   2749: 	my $lines = scalar @contents;
                   2750: 	for (my $i =0; $i < $lines; $i++) {
                   2751: 	    print $newfh ($contents[$i]);
                   2752: 	}
                   2753: 
                   2754: 	$oldfh->close;
                   2755: 	$newfh->close;
                   2756: 
                   2757: 	chmod(0660, $newfile);
                   2758: 
                   2759: 	return 1;
                   2760: 	    
                   2761:     } else {
                   2762: 	return 0;
                   2763:     }
                   2764: }
1.157     foxr     2765: #
                   2766: #  Host files are passed out with externally visible host IPs.
                   2767: #  If, for example, we are behind a fire-wall or NAT host, our 
                   2768: #  internally visible IP may be different than the externally
                   2769: #  visible IP.  Therefore, we always adjust the contents of the
                   2770: #  host file so that the entry for ME is the IP that we believe
                   2771: #  we have.  At present, this is defined as the entry that
                   2772: #  DNS has for us.  If by some chance we are not able to get a
                   2773: #  DNS translation for us, then we assume that the host.tab file
                   2774: #  is correct.  
                   2775: #    BUGBUGBUG - in the future, we really should see if we can
                   2776: #       easily query the interface(s) instead.
                   2777: # Parameter(s):
                   2778: #     contents    - The contents of the host.tab to check.
                   2779: # Returns:
                   2780: #     newcontents - The adjusted contents.
                   2781: #
                   2782: #
                   2783: sub AdjustHostContents {
                   2784:     my $contents  = shift;
                   2785:     my $adjusted;
                   2786:     my $me        = $perlvar{'lonHostID'};
                   2787: 
1.166     foxr     2788:  foreach my $line (split(/\n/,$contents)) {
1.157     foxr     2789: 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
                   2790: 	    chomp($line);
                   2791: 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
                   2792: 	    if ($id eq $me) {
1.166     foxr     2793:           my $ip = gethostbyname($name);
                   2794:           my $ipnew = inet_ntoa($ip);
                   2795:          $ip = $ipnew;
1.157     foxr     2796: 		#  Reconstruct the host line and append to adjusted:
                   2797: 		
1.166     foxr     2798: 		   my $newline = "$id:$domain:$role:$name:$ip";
                   2799: 		   if($maxcon ne "") { # Not all hosts have loncnew tuning params
                   2800: 		     $newline .= ":$maxcon:$idleto:$mincon";
                   2801: 		   }
                   2802: 		   $adjusted .= $newline."\n";
1.157     foxr     2803: 		
1.166     foxr     2804:       } else {		# Not me, pass unmodified.
                   2805: 		   $adjusted .= $line."\n";
                   2806:       }
1.157     foxr     2807: 	} else {                  # Blank or comment never re-written.
                   2808: 	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
                   2809: 	}
1.166     foxr     2810:  }
                   2811:  return $adjusted;
1.157     foxr     2812: }
1.143     foxr     2813: #
                   2814: #   InstallFile: Called to install an administrative file:
                   2815: #       - The file is created with <name>.tmp
                   2816: #       - The <name>.tmp file is then mv'd to <name>
                   2817: #   This lugubrious procedure is done to ensure that we are never without
                   2818: #   a valid, even if dated, version of the file regardless of who crashes
                   2819: #   and when the crash occurs.
                   2820: #
                   2821: #  Parameters:
                   2822: #       Name of the file
                   2823: #       File Contents.
                   2824: #  Return:
                   2825: #      nonzero - success.
                   2826: #      0       - failure and $! has an errno.
                   2827: #
                   2828: sub InstallFile {
                   2829:     my $Filename = shift;
                   2830:     my $Contents = shift;
                   2831:     my $TempFile = $Filename.".tmp";
                   2832: 
                   2833:     #  Open the file for write:
                   2834: 
                   2835:     my $fh = IO::File->new("> $TempFile"); # Write to temp.
                   2836:     if(!(defined $fh)) {
                   2837: 	&logthis('<font color="red"> Unable to create '.$TempFile."</font>");
                   2838: 	return 0;
                   2839:     }
                   2840:     #  write the contents of the file:
                   2841: 
                   2842:     print $fh ($Contents); 
                   2843:     $fh->close;			# In case we ever have a filesystem w. locking
                   2844: 
                   2845:     chmod(0660, $TempFile);
                   2846: 
                   2847:     # Now we can move install the file in position.
                   2848:     
                   2849:     move($TempFile, $Filename);
                   2850: 
                   2851:     return 1;
                   2852: }
1.169     foxr     2853: #
                   2854: #   ConfigFileFromSelector: converts a configuration file selector
                   2855: #                 (one of host or domain at this point) into a 
                   2856: #                 configuration file pathname.
                   2857: #
                   2858: #  Parameters:
                   2859: #      selector  - Configuration file selector.
                   2860: #  Returns:
                   2861: #      Full path to the file or undef if the selector is invalid.
                   2862: #
                   2863: sub ConfigFileFromSelector {
                   2864:     my $selector   = shift;
                   2865:     my $tablefile;
                   2866: 
                   2867:     my $tabledir = $perlvar{'lonTabDir'}.'/';
                   2868:     if ($selector eq "hosts") {
                   2869: 	$tablefile = $tabledir."hosts.tab";
                   2870:     } elsif ($selector eq "domain") {
                   2871: 	$tablefile = $tabledir."domain.tab";
                   2872:     } else {
                   2873: 	return undef;
                   2874:     }
                   2875:     return $tablefile;
1.143     foxr     2876: 
1.169     foxr     2877: }
1.143     foxr     2878: #
1.141     foxr     2879: #   PushFile:  Called to do an administrative push of a file.
                   2880: #              - Ensure the file being pushed is one we support.
                   2881: #              - Backup the old file to <filename.saved>
                   2882: #              - Separate the contents of the new file out from the
                   2883: #                rest of the request.
                   2884: #              - Write the new file.
                   2885: #  Parameter:
                   2886: #     Request - The entire user request.  This consists of a : separated
                   2887: #               string pushfile:tablename:contents.
                   2888: #     NOTE:  The contents may have :'s in it as well making things a bit
                   2889: #            more interesting... but not much.
                   2890: #  Returns:
                   2891: #     String to send to client ("ok" or "refused" if bad file).
                   2892: #
                   2893: sub PushFile {
                   2894:     my $request = shift;    
                   2895:     my ($command, $filename, $contents) = split(":", $request, 3);
                   2896:     
                   2897:     #  At this point in time, pushes for only the following tables are
                   2898:     #  supported:
                   2899:     #   hosts.tab  ($filename eq host).
                   2900:     #   domain.tab ($filename eq domain).
                   2901:     # Construct the destination filename or reject the request.
                   2902:     #
                   2903:     # lonManage is supposed to ensure this, however this session could be
                   2904:     # part of some elaborate spoof that managed somehow to authenticate.
                   2905:     #
                   2906: 
1.169     foxr     2907: 
                   2908:     my $tablefile = ConfigFileFromSelector($filename);
                   2909:     if(! (defined $tablefile)) {
1.141     foxr     2910: 	return "refused";
                   2911:     }
                   2912:     #
                   2913:     # >copy< the old table to the backup table
                   2914:     #        don't rename in case system crashes/reboots etc. in the time
                   2915:     #        window between a rename and write.
                   2916:     #
                   2917:     my $backupfile = $tablefile;
                   2918:     $backupfile    =~ s/\.tab$/.old/;
1.143     foxr     2919:     if(!CopyFile($tablefile, $backupfile)) {
                   2920: 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
                   2921: 	return "error:$!";
                   2922:     }
1.141     foxr     2923:     &logthis('<font color="green"> Pushfile: backed up '
                   2924: 	    .$tablefile." to $backupfile</font>");
                   2925:     
1.157     foxr     2926:     #  If the file being pushed is the host file, we adjust the entry for ourself so that the
                   2927:     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
                   2928:     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
                   2929:     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
                   2930:     #  that possibilty.
                   2931: 
                   2932:     if($filename eq "host") {
                   2933: 	$contents = AdjustHostContents($contents);
                   2934:     }
                   2935: 
1.141     foxr     2936:     #  Install the new file:
                   2937: 
1.143     foxr     2938:     if(!InstallFile($tablefile, $contents)) {
                   2939: 	&logthis('<font color="red"> Pushfile: unable to install '
1.145     foxr     2940: 	 .$tablefile." $! </font>");
1.143     foxr     2941: 	return "error:$!";
                   2942:     }
                   2943:     else {
                   2944: 	&logthis('<font color="green"> Installed new '.$tablefile
                   2945: 		 ."</font>");
                   2946: 
                   2947:     }
                   2948: 
1.141     foxr     2949: 
                   2950:     #  Indicate success:
                   2951:  
                   2952:     return "ok";
                   2953: 
                   2954: }
1.145     foxr     2955: 
                   2956: #
                   2957: #  Called to re-init either lonc or lond.
                   2958: #
                   2959: #  Parameters:
                   2960: #    request   - The full request by the client.  This is of the form
                   2961: #                reinit:<process>  
                   2962: #                where <process> is allowed to be either of 
                   2963: #                lonc or lond
                   2964: #
                   2965: #  Returns:
                   2966: #     The string to be sent back to the client either:
                   2967: #   ok         - Everything worked just fine.
                   2968: #   error:why  - There was a failure and why describes the reason.
                   2969: #
                   2970: #
                   2971: sub ReinitProcess {
                   2972:     my $request = shift;
                   2973: 
1.146     foxr     2974: 
                   2975:     # separate the request (reinit) from the process identifier and
                   2976:     # validate it producing the name of the .pid file for the process.
                   2977:     #
                   2978:     #
                   2979:     my ($junk, $process) = split(":", $request);
1.147     foxr     2980:     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146     foxr     2981:     if($process eq 'lonc') {
                   2982: 	$processpidfile = $processpidfile."lonc.pid";
1.147     foxr     2983: 	if (!open(PIDFILE, "< $processpidfile")) {
                   2984: 	    return "error:Open failed for $processpidfile";
                   2985: 	}
                   2986: 	my $loncpid = <PIDFILE>;
                   2987: 	close(PIDFILE);
                   2988: 	logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
                   2989: 		."</font>");
                   2990: 	kill("USR2", $loncpid);
1.146     foxr     2991:     } elsif ($process eq 'lond') {
1.147     foxr     2992: 	logthis('<font color="red"> Reinitializing self (lond) </font>');
                   2993: 	&UpdateHosts;			# Lond is us!!
1.146     foxr     2994:     } else {
                   2995: 	&logthis('<font color="yellow" Invalid reinit request for '.$process
                   2996: 		 ."</font>");
                   2997: 	return "error:Invalid process identifier $process";
                   2998:     }
1.145     foxr     2999:     return 'ok';
                   3000: }
1.168     foxr     3001: #   Validate a line in a configuration file edit script:
                   3002: #   Validation includes:
                   3003: #     - Ensuring the command is valid.
                   3004: #     - Ensuring the command has sufficient parameters
                   3005: #   Parameters:
                   3006: #     scriptline - A line to validate (\n has been stripped for what it's worth).
1.167     foxr     3007: #
1.168     foxr     3008: #   Return:
                   3009: #      0     - Invalid scriptline.
                   3010: #      1     - Valid scriptline
                   3011: #  NOTE:
                   3012: #     Only the command syntax is checked, not the executability of the
                   3013: #     command.
                   3014: #
                   3015: sub isValidEditCommand {
                   3016:     my $scriptline = shift;
                   3017: 
                   3018:     #   Line elements are pipe separated:
                   3019: 
                   3020:     my ($command, $key, $newline)  = split(/\|/, $scriptline);
                   3021:     &logthis('<font color="green"> isValideditCommand checking: '.
                   3022: 	     "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
                   3023:     
                   3024:     if ($command eq "delete") {
                   3025: 	#
                   3026: 	#   key with no newline.
                   3027: 	#
                   3028: 	if( ($key eq "") || ($newline ne "")) {
                   3029: 	    return 0;		# Must have key but no newline.
                   3030: 	} else {
                   3031: 	    return 1;		# Valid syntax.
                   3032: 	}
1.169     foxr     3033:     } elsif ($command eq "replace") {
1.168     foxr     3034: 	#
                   3035: 	#   key and newline:
                   3036: 	#
                   3037: 	if (($key eq "") || ($newline eq "")) {
                   3038: 	    return 0;
                   3039: 	} else {
                   3040: 	    return 1;
                   3041: 	}
1.169     foxr     3042:     } elsif ($command eq "append") {
                   3043: 	if (($key ne "") && ($newline eq "")) {
                   3044: 	    return 1;
                   3045: 	} else {
                   3046: 	    return 0;
                   3047: 	}
1.168     foxr     3048:     } else {
                   3049: 	return 0;		# Invalid command.
                   3050:     }
                   3051:     return 0;			# Should not get here!!!
                   3052: }
1.169     foxr     3053: #
                   3054: #   ApplyEdit - Applies an edit command to a line in a configuration 
                   3055: #               file.  It is the caller's responsiblity to validate the
                   3056: #               edit line.
                   3057: #   Parameters:
                   3058: #      $directive - A single edit directive to apply.  
                   3059: #                   Edit directives are of the form:
                   3060: #                  append|newline      - Appends a new line to the file.
                   3061: #                  replace|key|newline - Replaces the line with key value 'key'
                   3062: #                  delete|key          - Deletes the line with key value 'key'.
                   3063: #      $editor   - A config file editor object that contains the
                   3064: #                  file being edited.
                   3065: #
                   3066: sub ApplyEdit {
                   3067:     my $directive   = shift;
                   3068:     my $editor      = shift;
                   3069: 
                   3070:     # Break the directive down into its command and its parameters
                   3071:     # (at most two at this point.  The meaning of the parameters, if in fact
                   3072:     #  they exist depends on the command).
                   3073: 
                   3074:     my ($command, $p1, $p2) = split(/\|/, $directive);
                   3075: 
                   3076:     if($command eq "append") {
                   3077: 	$editor->Append($p1);	          # p1 - key p2 null.
                   3078:     } elsif ($command eq "replace") {
                   3079: 	$editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.
                   3080:     } elsif ($command eq "delete") {
                   3081: 	$editor->DeleteLine($p1);         # p1 - key p2 null.
                   3082:     } else {			          # Should not get here!!!
                   3083: 	die "Invalid command given to ApplyEdit $command"
                   3084:     }
                   3085: }
                   3086: #
                   3087: # AdjustOurHost:
                   3088: #           Adjusts a host file stored in a configuration file editor object
                   3089: #           for the true IP address of this host. This is necessary for hosts
                   3090: #           that live behind a firewall.
                   3091: #           Those hosts have a publicly distributed IP of the firewall, but
                   3092: #           internally must use their actual IP.  We assume that a given
                   3093: #           host only has a single IP interface for now.
                   3094: # Formal Parameters:
                   3095: #     editor   - The configuration file editor to adjust.  This
                   3096: #                editor is assumed to contain a hosts.tab file.
                   3097: # Strategy:
                   3098: #    - Figure out our hostname.
                   3099: #    - Lookup the entry for this host.
                   3100: #    - Modify the line to contain our IP
                   3101: #    - Do a replace for this host.
                   3102: sub AdjustOurHost {
                   3103:     my $editor        = shift;
                   3104: 
                   3105:     # figure out who I am.
                   3106: 
                   3107:     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.
                   3108: 
                   3109:     #  Get my host file entry.
                   3110: 
                   3111:     my $ConfigLine    = $editor->Find($myHostName);
                   3112:     if(! (defined $ConfigLine)) {
                   3113: 	die "AdjustOurHost - no entry for me in hosts file $myHostName";
                   3114:     }
                   3115:     # figure out my IP:
                   3116:     #   Use the config line to get my hostname.
                   3117:     #   Use gethostbyname to translate that into an IP address.
                   3118:     #
                   3119:     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
                   3120:     my $BinaryIp = gethostbyname($name);
                   3121:     my $ip       = inet_ntoa($ip);
                   3122:     #
                   3123:     #  Reassemble the config line from the elements in the list.
                   3124:     #  Note that if the loncnew items were not present before, they will
                   3125:     #  be now even if they would be empty
                   3126:     #
                   3127:     my $newConfigLine = $id;
                   3128:     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
                   3129: 	$newConfigLine .= ":".$item;
                   3130:     }
                   3131:     #  Replace the line:
                   3132: 
                   3133:     $editor->ReplaceLine($id, $newConfigLine);
                   3134:     
                   3135: }
                   3136: #
                   3137: #   ReplaceConfigFile:
                   3138: #              Replaces a configuration file with the contents of a
                   3139: #              configuration file editor object.
                   3140: #              This is done by:
                   3141: #              - Copying the target file to <filename>.old
                   3142: #              - Writing the new file to <filename>.tmp
                   3143: #              - Moving <filename.tmp>  -> <filename>
                   3144: #              This laborious process ensures that the system is never without
                   3145: #              a configuration file that's at least valid (even if the contents
                   3146: #              may be dated).
                   3147: #   Parameters:
                   3148: #        filename   - Name of the file to modify... this is a full path.
                   3149: #        editor     - Editor containing the file.
                   3150: #
                   3151: sub ReplaceConfigFile {
                   3152:     my $filename  = shift;
                   3153:     my $editor    = shift;
1.168     foxr     3154: 
1.169     foxr     3155:     CopyFile ($filename, $filename.".old");
                   3156: 
                   3157:     my $contents  = $editor->Get(); # Get the contents of the file.
                   3158: 
                   3159:     InstallFile($filename, $contents);
                   3160: }
1.168     foxr     3161: #   
                   3162: #
                   3163: #   Called to edit a configuration table  file
1.167     foxr     3164: #   Parameters:
                   3165: #      request           - The entire command/request sent by lonc or lonManage
                   3166: #   Return:
                   3167: #      The reply to send to the client.
1.168     foxr     3168: #
1.167     foxr     3169: sub EditFile {
                   3170:     my $request = shift;
                   3171: 
                   3172:     #  Split the command into it's pieces:  edit:filetype:script
                   3173: 
1.168     foxr     3174:     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
1.167     foxr     3175: 
                   3176:     #  Check the pre-coditions for success:
                   3177: 
                   3178:     if($request != "edit") {	# Something is amiss afoot alack.
                   3179: 	return "error:edit request detected, but request != 'edit'\n";
                   3180:     }
                   3181:     if( ($filetype ne "hosts")  &&
                   3182: 	($filetype ne "domain")) {
                   3183: 	return "error:edit requested with invalid file specifier: $filetype \n";
                   3184:     }
                   3185: 
                   3186:     #   Split the edit script and check it's validity.
1.168     foxr     3187: 
                   3188:     my @scriptlines = split(/\n/, $script);  # one line per element.
                   3189:     my $linecount   = scalar(@scriptlines);
                   3190:     for(my $i = 0; $i < $linecount; $i++) {
                   3191: 	chomp($scriptlines[$i]);
                   3192: 	if(!isValidEditCommand($scriptlines[$i])) {
                   3193: 	    return "error:edit with bad script line: '$scriptlines[$i]' \n";
                   3194: 	}
                   3195:     }
1.145     foxr     3196: 
1.167     foxr     3197:     #   Execute the edit operation.
1.169     foxr     3198:     #   - Create a config file editor for the appropriate file and 
                   3199:     #   - execute each command in the script:
                   3200:     #
                   3201:     my $configfile = ConfigFileFromSelector($filetype);
                   3202:     if (!(defined $configfile)) {
                   3203: 	return "refused\n";
                   3204:     }
                   3205:     my $editor = ConfigFileEdit->new($configfile);
1.167     foxr     3206: 
1.169     foxr     3207:     for (my $i = 0; $i < $linecount; $i++) {
                   3208: 	ApplyEdit($scriptlines[$i], $editor);
                   3209:     }
                   3210:     # If the file is the host file, ensure that our host is
                   3211:     # adjusted to have our ip:
                   3212:     #
                   3213:     if($filetype eq "host") {
                   3214: 	AdjustOurHost($editor);
                   3215:     }
                   3216:     #  Finally replace the current file with our file.
                   3217:     #
                   3218:     ReplaceConfigFile($configfile, $editor);
1.167     foxr     3219: 
                   3220:     return "ok\n";
                   3221: }
1.141     foxr     3222: #
1.96      foxr     3223: #  Convert an error return code from lcpasswd to a string value.
                   3224: #
                   3225: sub lcpasswdstrerror {
                   3226:     my $ErrorCode = shift;
1.97      foxr     3227:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96      foxr     3228: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
                   3229:     } else {
1.98      foxr     3230: 	return $passwderrors[$ErrorCode];
1.96      foxr     3231:     }
                   3232: }
                   3233: 
1.97      foxr     3234: #
                   3235: # Convert an error return code from lcuseradd to a string value:
                   3236: #
                   3237: sub lcuseraddstrerror {
                   3238:     my $ErrorCode = shift;
                   3239:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
                   3240: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
                   3241:     } else {
1.98      foxr     3242: 	return $adderrors[$ErrorCode];
1.97      foxr     3243:     }
                   3244: }
                   3245: 
1.23      harris41 3246: # grabs exception and records it to log before exiting
                   3247: sub catchexception {
1.27      albertel 3248:     my ($error)=@_;
1.25      www      3249:     $SIG{'QUIT'}='DEFAULT';
                   3250:     $SIG{__DIE__}='DEFAULT';
1.165     albertel 3251:     &status("Catching exception");
1.23      harris41 3252:     &logthis("<font color=red>CRITICAL: "
1.134     albertel 3253:      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
1.27      albertel 3254:      ."a crash with this error msg->[$error]</font>");
1.57      www      3255:     &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27      albertel 3256:     if ($client) { print $client "error: $error\n"; }
1.59      www      3257:     $server->close();
1.27      albertel 3258:     die($error);
1.23      harris41 3259: }
                   3260: 
1.63      www      3261: sub timeout {
1.165     albertel 3262:     &status("Handling Timeout");
1.63      www      3263:     &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
                   3264:     &catchexception('Timeout');
                   3265: }
1.22      harris41 3266: # -------------------------------- Set signal handlers to record abnormal exits
                   3267: 
                   3268: $SIG{'QUIT'}=\&catchexception;
                   3269: $SIG{__DIE__}=\&catchexception;
                   3270: 
1.81      matthew  3271: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95      harris41 3272: &status("Read loncapa.conf and loncapa_apache.conf");
                   3273: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141     foxr     3274: %perlvar=%{$perlvarref};
1.80      harris41 3275: undef $perlvarref;
1.19      www      3276: 
1.35      harris41 3277: # ----------------------------- Make sure this process is running from user=www
                   3278: my $wwwid=getpwnam('www');
                   3279: if ($wwwid!=$<) {
1.134     albertel 3280:    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   3281:    my $subj="LON: $currenthostid User ID mismatch";
1.37      harris41 3282:    system("echo 'User ID mismatch.  lond must be run as user www.' |\
1.35      harris41 3283:  mailto $emailto -s '$subj' > /dev/null");
                   3284:    exit 1;
                   3285: }
                   3286: 
1.19      www      3287: # --------------------------------------------- Check if other instance running
                   3288: 
                   3289: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
                   3290: 
                   3291: if (-e $pidfile) {
                   3292:    my $lfh=IO::File->new("$pidfile");
                   3293:    my $pide=<$lfh>;
                   3294:    chomp($pide);
1.29      harris41 3295:    if (kill 0 => $pide) { die "already running"; }
1.19      www      3296: }
1.1       albertel 3297: 
                   3298: # ------------------------------------------------------------- Read hosts file
                   3299: 
                   3300: 
                   3301: 
                   3302: # establish SERVER socket, bind and listen.
                   3303: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                   3304:                                 Type      => SOCK_STREAM,
                   3305:                                 Proto     => 'tcp',
                   3306:                                 Reuse     => 1,
                   3307:                                 Listen    => 10 )
1.29      harris41 3308:   or die "making socket: $@\n";
1.1       albertel 3309: 
                   3310: # --------------------------------------------------------- Do global variables
                   3311: 
                   3312: # global variables
                   3313: 
1.134     albertel 3314: my %children               = ();       # keys are current child process IDs
1.178.2.1! foxr     3315: my $children               = 0;        # current number of children
1.1       albertel 3316: 
                   3317: sub REAPER {                        # takes care of dead children
                   3318:     $SIG{CHLD} = \&REAPER;
1.165     albertel 3319:     &status("Handling child death");
1.178.2.1! foxr     3320:     my $pid = wait;
        !          3321:     if (defined($children{$pid})) {
        !          3322: 	&logthis("Child $pid died");
        !          3323: 	$children --;
        !          3324: 	delete $children{$pid};
        !          3325:     } else {
        !          3326: 	&logthis("Unknown Child $pid died");
1.176     albertel 3327:     }
1.165     albertel 3328:     &status("Finished Handling child death");
1.1       albertel 3329: }
                   3330: 
                   3331: sub HUNTSMAN {                      # signal handler for SIGINT
1.165     albertel 3332:     &status("Killing children (INT)");
1.1       albertel 3333:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                   3334:     kill 'INT' => keys %children;
1.59      www      3335:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1       albertel 3336:     my $execdir=$perlvar{'lonDaemons'};
                   3337:     unlink("$execdir/logs/lond.pid");
1.9       www      3338:     &logthis("<font color=red>CRITICAL: Shutting down</font>");
1.165     albertel 3339:     &status("Done killing children");
1.1       albertel 3340:     exit;                           # clean up with dignity
                   3341: }
                   3342: 
                   3343: sub HUPSMAN {                      # signal handler for SIGHUP
                   3344:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
1.165     albertel 3345:     &status("Killing children for restart (HUP)");
1.1       albertel 3346:     kill 'INT' => keys %children;
1.59      www      3347:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.9       www      3348:     &logthis("<font color=red>CRITICAL: Restarting</font>");
1.134     albertel 3349:     my $execdir=$perlvar{'lonDaemons'};
1.30      harris41 3350:     unlink("$execdir/logs/lond.pid");
1.165     albertel 3351:     &status("Restarting self (HUP)");
1.1       albertel 3352:     exec("$execdir/lond");         # here we go again
                   3353: }
                   3354: 
1.144     foxr     3355: #
1.148     foxr     3356: #    Kill off hashes that describe the host table prior to re-reading it.
                   3357: #    Hashes affected are:
                   3358: #       %hostid, %hostdom %hostip
                   3359: #
                   3360: sub KillHostHashes {
                   3361:     foreach my $key (keys %hostid) {
                   3362: 	delete $hostid{$key};
                   3363:     }
                   3364:     foreach my $key (keys %hostdom) {
                   3365: 	delete $hostdom{$key};
                   3366:     }
                   3367:     foreach my $key (keys %hostip) {
                   3368: 	delete $hostip{$key};
                   3369:     }
                   3370: }
                   3371: #
                   3372: #   Read in the host table from file and distribute it into the various hashes:
                   3373: #
                   3374: #    - %hostid  -  Indexed by IP, the loncapa hostname.
                   3375: #    - %hostdom -  Indexed by  loncapa hostname, the domain.
                   3376: #    - %hostip  -  Indexed by hostid, the Ip address of the host.
                   3377: sub ReadHostTable {
                   3378: 
                   3379:     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
                   3380:     
                   3381:     while (my $configline=<CONFIG>) {
1.178.2.1! foxr     3382: 	my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
        !          3383: 	chomp($ip); $ip=~s/\D+$//;
        !          3384: 	$hostid{$ip}=$id;
        !          3385: 	$hostdom{$id}=$domain;
        !          3386: 	$hostip{$id}=$ip;
        !          3387: 	if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
1.148     foxr     3388:     }
                   3389:     close(CONFIG);
                   3390: }
                   3391: #
                   3392: #  Reload the Apache daemon's state.
1.150     foxr     3393: #  This is done by invoking /home/httpd/perl/apachereload
                   3394: #  a setuid perl script that can be root for us to do this job.
1.148     foxr     3395: #
                   3396: sub ReloadApache {
1.150     foxr     3397:     my $execdir = $perlvar{'lonDaemons'};
                   3398:     my $script  = $execdir."/apachereload";
                   3399:     system($script);
1.148     foxr     3400: }
                   3401: 
                   3402: #
1.144     foxr     3403: #   Called in response to a USR2 signal.
                   3404: #   - Reread hosts.tab
                   3405: #   - All children connected to hosts that were removed from hosts.tab
                   3406: #     are killed via SIGINT
                   3407: #   - All children connected to previously existing hosts are sent SIGUSR1
                   3408: #   - Our internal hosts hash is updated to reflect the new contents of
                   3409: #     hosts.tab causing connections from hosts added to hosts.tab to
                   3410: #     now be honored.
                   3411: #
                   3412: sub UpdateHosts {
1.165     albertel 3413:     &status("Reload hosts.tab");
1.147     foxr     3414:     logthis('<font color="blue"> Updating connections </font>');
1.148     foxr     3415:     #
                   3416:     #  The %children hash has the set of IP's we currently have children
                   3417:     #  on.  These need to be matched against records in the hosts.tab
                   3418:     #  Any ip's no longer in the table get killed off they correspond to
                   3419:     #  either dropped or changed hosts.  Note that the re-read of the table
                   3420:     #  will take care of new and changed hosts as connections come into being.
                   3421: 
                   3422: 
                   3423:     KillHostHashes;
                   3424:     ReadHostTable;
                   3425: 
                   3426:     foreach my $child (keys %children) {
                   3427: 	my $childip = $children{$child};
                   3428: 	if(!$hostid{$childip}) {
1.149     foxr     3429: 	    logthis('<font color="blue"> UpdateHosts killing child '
                   3430: 		    ." $child for ip $childip </font>");
1.148     foxr     3431: 	    kill('INT', $child);
1.149     foxr     3432: 	} else {
                   3433: 	    logthis('<font color="green"> keeping child for ip '
                   3434: 		    ." $childip (pid=$child) </font>");
1.148     foxr     3435: 	}
                   3436:     }
                   3437:     ReloadApache;
1.165     albertel 3438:     &status("Finished reloading hosts.tab");
1.144     foxr     3439: }
                   3440: 
1.148     foxr     3441: 
1.57      www      3442: sub checkchildren {
1.165     albertel 3443:     &status("Checking on the children (sending signals)");
1.57      www      3444:     &initnewstatus();
                   3445:     &logstatus();
                   3446:     &logthis('Going to check on the children');
1.134     albertel 3447:     my $docdir=$perlvar{'lonDocRoot'};
1.61      harris41 3448:     foreach (sort keys %children) {
1.57      www      3449: 	sleep 1;
                   3450:         unless (kill 'USR1' => $_) {
                   3451: 	    &logthis ('Child '.$_.' is dead');
                   3452:             &logstatus($$.' is dead');
                   3453:         } 
1.61      harris41 3454:     }
1.63      www      3455:     sleep 5;
1.113     albertel 3456:     $SIG{ALRM} = sub { die "timeout" };
                   3457:     $SIG{__DIE__} = 'DEFAULT';
1.165     albertel 3458:     &status("Checking on the children (waiting for reports)");
1.63      www      3459:     foreach (sort keys %children) {
                   3460:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.113     albertel 3461:           eval {
                   3462:             alarm(300);
1.63      www      3463: 	    &logthis('Child '.$_.' did not respond');
1.67      albertel 3464: 	    kill 9 => $_;
1.131     albertel 3465: 	    #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   3466: 	    #$subj="LON: $currenthostid killed lond process $_";
                   3467: 	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
                   3468: 	    #$execdir=$perlvar{'lonDaemons'};
                   3469: 	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
1.113     albertel 3470: 	    alarm(0);
                   3471: 	  }
1.63      www      3472:         }
                   3473:     }
1.113     albertel 3474:     $SIG{ALRM} = 'DEFAULT';
1.155     albertel 3475:     $SIG{__DIE__} = \&catchexception;
1.165     albertel 3476:     &status("Finished checking children");
1.57      www      3477: }
                   3478: 
1.1       albertel 3479: # --------------------------------------------------------------------- Logging
                   3480: 
                   3481: sub logthis {
                   3482:     my $message=shift;
                   3483:     my $execdir=$perlvar{'lonDaemons'};
                   3484:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
                   3485:     my $now=time;
                   3486:     my $local=localtime($now);
1.58      www      3487:     $lastlog=$local.': '.$message;
1.1       albertel 3488:     print $fh "$local ($$): $message\n";
                   3489: }
                   3490: 
1.77      foxr     3491: # ------------------------- Conditional log if $DEBUG true.
                   3492: sub Debug {
                   3493:     my $message = shift;
                   3494:     if($DEBUG) {
                   3495: 	&logthis($message);
                   3496:     }
                   3497: }
1.161     foxr     3498: 
                   3499: #
                   3500: #   Sub to do replies to client.. this gives a hook for some
                   3501: #   debug tracing too:
                   3502: #  Parameters:
                   3503: #     fd      - File open on client.
                   3504: #     reply   - Text to send to client.
                   3505: #     request - Original request from client.
                   3506: #
1.178.2.1! foxr     3507: #  Note: This increments Transactions
        !          3508: #
1.161     foxr     3509: sub Reply {
1.178.2.1! foxr     3510:     alarm(120);
1.161     foxr     3511:     my $fd      = shift;
                   3512:     my $reply   = shift;
                   3513:     my $request = shift;
                   3514: 
                   3515:     print $fd $reply;
                   3516:     Debug("Request was $request  Reply was $reply");
                   3517: 
1.178.2.1! foxr     3518:     $Transactions++;
        !          3519:     alarm(0);
        !          3520: 
        !          3521: 
        !          3522: }
        !          3523: #
        !          3524: #    Sub to report a failure.
        !          3525: #    This function:
        !          3526: #     -   Increments the failure statistic counters.
        !          3527: #     -   Invokes Reply to send the error message to the client.
        !          3528: # Parameters:
        !          3529: #    fd       - File descriptor open on the client
        !          3530: #    reply    - Reply text to emit.
        !          3531: #    request  - The original request message (used by Reply
        !          3532: #               to debug if that's enabled.
        !          3533: # Implicit outputs:
        !          3534: #    $Failures- The number of failures is incremented.
        !          3535: #    Reply (invoked here) sends a message to the 
        !          3536: #    client:
        !          3537: #
        !          3538: sub Failure {
        !          3539:    my $fd      = shift;
        !          3540:    my $reply   = shift;
        !          3541:    my $request = shift;
        !          3542:    
        !          3543:    $Failures++;
        !          3544:    Reply($fd, $reply, $request);      # That's simple eh?
1.161     foxr     3545: }
1.57      www      3546: # ------------------------------------------------------------------ Log status
                   3547: 
                   3548: sub logstatus {
1.178.2.1! foxr     3549:    &status("Doing logging");
        !          3550:    my $docdir=$perlvar{'lonDocRoot'};
        !          3551:    {
        !          3552:       my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
        !          3553:       print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";
        !          3554:       $fh->close();
        !          3555:    }
        !          3556:    &status("Finished londstatus.txt");
        !          3557:    {
        !          3558:       my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
        !          3559:       print $fh $status."\n".$lastlog."\n".time;
        !          3560:       $fh->close();
        !          3561:    }
        !          3562:    ResetStatistics;
        !          3563:    &status("Finished logging");
        !          3564:    
1.57      www      3565: }
                   3566: 
                   3567: sub initnewstatus {
                   3568:     my $docdir=$perlvar{'lonDocRoot'};
                   3569:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
                   3570:     my $now=time;
                   3571:     my $local=localtime($now);
                   3572:     print $fh "LOND status $local - parent $$\n\n";
1.64      www      3573:     opendir(DIR,"$docdir/lon-status/londchld");
1.134     albertel 3574:     while (my $filename=readdir(DIR)) {
1.64      www      3575:         unlink("$docdir/lon-status/londchld/$filename");
                   3576:     }
                   3577:     closedir(DIR);
1.57      www      3578: }
                   3579: 
                   3580: # -------------------------------------------------------------- Status setting
                   3581: 
                   3582: sub status {
                   3583:     my $what=shift;
                   3584:     my $now=time;
                   3585:     my $local=localtime($now);
1.178.2.1! foxr     3586:     my $status = "lond: $what $local ";
        !          3587:     if($Transactions) {
        !          3588:        $status .= " Transactions: $Transactions Failed; $Failures";
        !          3589:     }
        !          3590:     $0=$status;
1.57      www      3591: }
1.11      www      3592: 
                   3593: # -------------------------------------------------------- Escape Special Chars
                   3594: 
                   3595: sub escape {
                   3596:     my $str=shift;
                   3597:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
                   3598:     return $str;
                   3599: }
                   3600: 
                   3601: # ----------------------------------------------------- Un-Escape Special Chars
                   3602: 
                   3603: sub unescape {
                   3604:     my $str=shift;
                   3605:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                   3606:     return $str;
                   3607: }
                   3608: 
1.1       albertel 3609: # ----------------------------------------------------------- Send USR1 to lonc
                   3610: 
                   3611: sub reconlonc {
                   3612:     my $peerfile=shift;
                   3613:     &logthis("Trying to reconnect for $peerfile");
                   3614:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
                   3615:     if (my $fh=IO::File->new("$loncfile")) {
                   3616: 	my $loncpid=<$fh>;
                   3617:         chomp($loncpid);
                   3618:         if (kill 0 => $loncpid) {
                   3619: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
                   3620:             kill USR1 => $loncpid;
                   3621:         } else {
1.9       www      3622: 	    &logthis(
                   3623:               "<font color=red>CRITICAL: "
                   3624:              ."lonc at pid $loncpid not responding, giving up</font>");
1.1       albertel 3625:         }
                   3626:     } else {
1.9       www      3627:       &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
1.1       albertel 3628:     }
                   3629: }
                   3630: 
                   3631: # -------------------------------------------------- Non-critical communication
1.11      www      3632: 
1.1       albertel 3633: sub subreply {
                   3634:     my ($cmd,$server)=@_;
                   3635:     my $peerfile="$perlvar{'lonSockDir'}/$server";
                   3636:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   3637:                                       Type    => SOCK_STREAM,
                   3638:                                       Timeout => 10)
                   3639:        or return "con_lost";
                   3640:     print $sclient "$cmd\n";
                   3641:     my $answer=<$sclient>;
                   3642:     chomp($answer);
                   3643:     if (!$answer) { $answer="con_lost"; }
                   3644:     return $answer;
                   3645: }
                   3646: 
                   3647: sub reply {
                   3648:   my ($cmd,$server)=@_;
                   3649:   my $answer;
1.115     albertel 3650:   if ($server ne $currenthostid) { 
1.1       albertel 3651:     $answer=subreply($cmd,$server);
                   3652:     if ($answer eq 'con_lost') {
                   3653: 	$answer=subreply("ping",$server);
                   3654:         if ($answer ne $server) {
1.115     albertel 3655: 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
1.1       albertel 3656:            &reconlonc("$perlvar{'lonSockDir'}/$server");
                   3657:         }
                   3658:         $answer=subreply($cmd,$server);
                   3659:     }
                   3660:   } else {
                   3661:     $answer='self_reply';
                   3662:   } 
                   3663:   return $answer;
                   3664: }
                   3665: 
1.13      www      3666: # -------------------------------------------------------------- Talk to lonsql
                   3667: 
1.12      harris41 3668: sub sqlreply {
                   3669:     my ($cmd)=@_;
                   3670:     my $answer=subsqlreply($cmd);
                   3671:     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
                   3672:     return $answer;
                   3673: }
                   3674: 
                   3675: sub subsqlreply {
                   3676:     my ($cmd)=@_;
                   3677:     my $unixsock="mysqlsock";
                   3678:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
                   3679:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   3680:                                       Type    => SOCK_STREAM,
                   3681:                                       Timeout => 10)
                   3682:        or return "con_lost";
                   3683:     print $sclient "$cmd\n";
                   3684:     my $answer=<$sclient>;
                   3685:     chomp($answer);
                   3686:     if (!$answer) { $answer="con_lost"; }
                   3687:     return $answer;
                   3688: }
                   3689: 
1.1       albertel 3690: # -------------------------------------------- Return path to profile directory
1.11      www      3691: 
1.1       albertel 3692: sub propath {
                   3693:     my ($udom,$uname)=@_;
                   3694:     $udom=~s/\W//g;
                   3695:     $uname=~s/\W//g;
1.16      www      3696:     my $subdir=$uname.'__';
1.1       albertel 3697:     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
                   3698:     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
                   3699:     return $proname;
                   3700: } 
                   3701: 
                   3702: # --------------------------------------- Is this the home server of an author?
1.11      www      3703: 
1.1       albertel 3704: sub ishome {
                   3705:     my $author=shift;
                   3706:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                   3707:     my ($udom,$uname)=split(/\//,$author);
                   3708:     my $proname=propath($udom,$uname);
                   3709:     if (-e $proname) {
                   3710: 	return 'owner';
                   3711:     } else {
                   3712:         return 'not_owner';
                   3713:     }
                   3714: }
                   3715: 
                   3716: # ======================================================= Continue main program
                   3717: # ---------------------------------------------------- Fork once and dissociate
                   3718: 
1.134     albertel 3719: my $fpid=fork;
1.1       albertel 3720: exit if $fpid;
1.29      harris41 3721: die "Couldn't fork: $!" unless defined ($fpid);
1.1       albertel 3722: 
1.29      harris41 3723: POSIX::setsid() or die "Can't start new session: $!";
1.1       albertel 3724: 
                   3725: # ------------------------------------------------------- Write our PID on disk
                   3726: 
1.134     albertel 3727: my $execdir=$perlvar{'lonDaemons'};
1.1       albertel 3728: open (PIDSAVE,">$execdir/logs/lond.pid");
                   3729: print PIDSAVE "$$\n";
                   3730: close(PIDSAVE);
1.9       www      3731: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
1.57      www      3732: &status('Starting');
1.1       albertel 3733: 
1.106     foxr     3734: 
1.1       albertel 3735: 
                   3736: # ----------------------------------------------------- Install signal handlers
                   3737: 
1.57      www      3738: 
1.1       albertel 3739: $SIG{CHLD} = \&REAPER;
                   3740: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   3741: $SIG{HUP}  = \&HUPSMAN;
1.57      www      3742: $SIG{USR1} = \&checkchildren;
1.144     foxr     3743: $SIG{USR2} = \&UpdateHosts;
1.106     foxr     3744: 
1.148     foxr     3745: #  Read the host hashes:
                   3746: 
                   3747: ReadHostTable;
1.106     foxr     3748: 
1.178.2.1! foxr     3749: 
1.106     foxr     3750: # --------------------------------------------------------------
                   3751: #   Accept connections.  When a connection comes in, it is validated
                   3752: #   and if good, a child process is created to process transactions
                   3753: #   along the connection.
                   3754: 
1.1       albertel 3755: while (1) {
1.165     albertel 3756:     &status('Starting accept');
1.106     foxr     3757:     $client = $server->accept() or next;
1.165     albertel 3758:     &status('Accepted '.$client.' off to spawn');
1.106     foxr     3759:     make_new_child($client);
1.165     albertel 3760:     &status('Finished spawning');
1.1       albertel 3761: }
                   3762: 
                   3763: sub make_new_child {
                   3764:     my $pid;
                   3765:     my $sigset;
1.106     foxr     3766: 
                   3767:     $client = shift;
1.165     albertel 3768:     &status('Starting new child '.$client);
1.161     foxr     3769:     &logthis('<font color="green"> Attempting to start child ('.$client.
                   3770: 	     ")</font>");    
1.1       albertel 3771:     # block signal for fork
                   3772:     $sigset = POSIX::SigSet->new(SIGINT);
                   3773:     sigprocmask(SIG_BLOCK, $sigset)
1.29      harris41 3774:         or die "Can't block SIGINT for fork: $!\n";
1.134     albertel 3775: 
1.29      harris41 3776:     die "fork: $!" unless defined ($pid = fork);
1.148     foxr     3777: 
                   3778:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                   3779: 	                               # connection liveness.
                   3780: 
                   3781:     #
                   3782:     #  Figure out who we're talking to so we can record the peer in 
                   3783:     #  the pid hash.
                   3784:     #
                   3785:     my $caller = getpeername($client);
                   3786:     my ($port,$iaddr)=unpack_sockaddr_in($caller);
                   3787:     $clientip=inet_ntoa($iaddr);
1.1       albertel 3788:     
                   3789:     if ($pid) {
                   3790:         # Parent records the child's birth and returns.
                   3791:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 3792:             or die "Can't unblock SIGINT for fork: $!\n";
1.148     foxr     3793:         $children{$pid} = $clientip;
1.178.2.1! foxr     3794:         $children++;
1.57      www      3795:         &status('Started child '.$pid);
1.1       albertel 3796:         return;
                   3797:     } else {
                   3798:         # Child can *not* return from this subroutine.
                   3799:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
1.126     albertel 3800:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
                   3801:                                 #don't get intercepted
1.57      www      3802:         $SIG{USR1}= \&logstatus;
1.63      www      3803:         $SIG{ALRM}= \&timeout;
1.57      www      3804:         $lastlog='Forked ';
                   3805:         $status='Forked';
                   3806: 
1.1       albertel 3807:         # unblock signals
                   3808:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 3809:             or die "Can't unblock SIGINT for fork: $!\n";
1.13      www      3810: 
1.178.2.1! foxr     3811: 
        !          3812: 	
1.91      albertel 3813:         &Authen::Krb5::init_context();
                   3814:         &Authen::Krb5::init_ets();
                   3815: 
1.161     foxr     3816: 	&status('Accepted connection');
1.1       albertel 3817: # =============================================================================
                   3818:             # do something with the connection
                   3819: # -----------------------------------------------------------------------------
1.148     foxr     3820: 	# see if we know client and check for spoof IP by challenge
                   3821: 
1.161     foxr     3822: 	ReadManagerTable;	# May also be a manager!!
                   3823: 	
                   3824: 	my $clientrec=($hostid{$clientip}     ne undef);
                   3825: 	my $ismanager=($managers{$clientip}    ne undef);
                   3826: 	$clientname  = "[unknonwn]";
                   3827: 	if($clientrec) {	# Establish client type.
                   3828: 	    $ConnectionType = "client";
                   3829: 	    $clientname = $hostid{$clientip};
                   3830: 	    if($ismanager) {
                   3831: 		$ConnectionType = "both";
                   3832: 	    }
                   3833: 	} else {
                   3834: 	    $ConnectionType = "manager";
                   3835: 	    $clientname = $managers{$clientip};
                   3836: 	}
                   3837: 	my $clientok;
                   3838: 	if ($clientrec || $ismanager) {
                   3839: 	    &status("Waiting for init from $clientip $clientname");
                   3840: 	    &logthis('<font color="yellow">INFO: Connection, '.
                   3841: 		     $clientip.
                   3842: 		  " ($clientname) connection type = $ConnectionType </font>" );
                   3843: 	    &status("Connecting $clientip  ($clientname))"); 
                   3844: 	    my $remotereq=<$client>;
                   3845: 	    $remotereq=~s/[^\w:]//g;
                   3846: 	    if ($remotereq =~ /^init/) {
                   3847: 		&sethost("sethost:$perlvar{'lonHostID'}");
                   3848: 		my $challenge="$$".time;
                   3849: 		print $client "$challenge\n";
                   3850: 		&status(
                   3851: 			"Waiting for challenge reply from $clientip ($clientname)"); 
                   3852: 		$remotereq=<$client>;
                   3853: 		$remotereq=~s/\W//g;
                   3854: 		if ($challenge eq $remotereq) {
                   3855: 		    $clientok=1;
                   3856: 		    print $client "ok\n";
                   3857: 		} else {
                   3858: 		    &logthis(
                   3859: 			     "<font color=blue>WARNING: $clientip did not reply challenge</font>");
                   3860: 		    &status('No challenge reply '.$clientip);
                   3861: 		}
1.2       www      3862: 	    } else {
1.161     foxr     3863: 		&logthis(
                   3864: 			 "<font color=blue>WARNING: "
                   3865: 			 ."$clientip failed to initialize: >$remotereq< </font>");
                   3866: 		&status('No init '.$clientip);
                   3867: 	    }
                   3868: 	} else {
                   3869: 	    &logthis(
                   3870: 		     "<font color=blue>WARNING: Unknown client $clientip</font>");
                   3871: 	    &status('Hung up on '.$clientip);
                   3872: 	}
                   3873: 	if ($clientok) {
1.1       albertel 3874: # ---------------- New known client connecting, could mean machine online again
1.161     foxr     3875: 	    
                   3876: 	    foreach my $id (keys(%hostip)) {
                   3877: 		if ($hostip{$id} ne $clientip ||
                   3878: 		    $hostip{$currenthostid} eq $clientip) {
                   3879: 		    # no need to try to do recon's to myself
                   3880: 		    next;
1.115     albertel 3881: 		}
1.161     foxr     3882: 		&reconlonc("$perlvar{'lonSockDir'}/$id");
                   3883: 	    }
                   3884: 	    &logthis("<font color=green>Established connection: $clientname</font>");
                   3885: 	    &status('Will listen to '.$clientname);
                   3886: 
1.178.2.1! foxr     3887: 	    ResetStatistics();
1.161     foxr     3888: 
1.178.2.1! foxr     3889: # ------------------------------------------------------------ Process requests
        !          3890: 	    my $KeepGoing = 1;
        !          3891: 	    while ((my $userinput=GetRequest) && $KeepGoing) {
        !          3892: 		$KeepGoing = ProcessRequest($userinput);
1.177     foxr     3893: # -------------------------------------------------------------------- complete
1.178.2.1! foxr     3894: 
1.161     foxr     3895: 		&status('Listening to '.$clientname);
                   3896: 	    }
1.59      www      3897: # --------------------------------------------- client unknown or fishy, refuse
1.161     foxr     3898: 	} else {
                   3899: 	    print $client "refused\n";
                   3900: 	    $client->close();
                   3901: 	    &logthis("<font color=blue>WARNING: "
                   3902: 		     ."Rejected client $clientip, closing connection</font>");
                   3903: 	}
                   3904:     }             
                   3905:     
1.1       albertel 3906: # =============================================================================
1.161     foxr     3907:     
                   3908:     &logthis("<font color=red>CRITICAL: "
                   3909: 	     ."Disconnect from $clientip ($clientname)</font>");    
                   3910:     
                   3911:     
                   3912:     # this exit is VERY important, otherwise the child will become
                   3913:     # a producer of more and more children, forking yourself into
                   3914:     # process death.
                   3915:     exit;
1.106     foxr     3916:     
1.78      foxr     3917: }
                   3918: 
                   3919: 
                   3920: #
                   3921: #   Checks to see if the input roleput request was to set
                   3922: # an author role.  If so, invokes the lchtmldir script to set
                   3923: # up a correct public_html 
                   3924: # Parameters:
                   3925: #    request   - The request sent to the rolesput subchunk.
                   3926: #                We're looking for  /domain/_au
                   3927: #    domain    - The domain in which the user is having roles doctored.
                   3928: #    user      - Name of the user for which the role is being put.
                   3929: #    authtype  - The authentication type associated with the user.
                   3930: #
                   3931: sub ManagePermissions
                   3932: {
                   3933:     my $request = shift;
                   3934:     my $domain  = shift;
                   3935:     my $user    = shift;
                   3936:     my $authtype= shift;
                   3937: 
                   3938:     # See if the request is of the form /$domain/_au
1.178.2.1! foxr     3939:     &logthis("ruequest is $request");
1.78      foxr     3940:     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
                   3941: 	my $execdir = $perlvar{'lonDaemons'};
                   3942: 	my $userhome= "/home/$user" ;
1.134     albertel 3943: 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.78      foxr     3944: 	system("$execdir/lchtmldir $userhome $user $authtype");
                   3945:     }
                   3946: }
                   3947: #
                   3948: #   GetAuthType - Determines the authorization type of a user in a domain.
                   3949: 
                   3950: #     Returns the authorization type or nouser if there is no such user.
                   3951: #
                   3952: sub GetAuthType 
                   3953: {
                   3954:     my $domain = shift;
                   3955:     my $user   = shift;
                   3956: 
1.79      foxr     3957:     Debug("GetAuthType( $domain, $user ) \n");
1.78      foxr     3958:     my $proname    = &propath($domain, $user); 
                   3959:     my $passwdfile = "$proname/passwd";
                   3960:     if( -e $passwdfile ) {
                   3961: 	my $pf = IO::File->new($passwdfile);
                   3962: 	my $realpassword = <$pf>;
                   3963: 	chomp($realpassword);
1.79      foxr     3964: 	Debug("Password info = $realpassword\n");
1.78      foxr     3965: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79      foxr     3966: 	Debug("Authtype = $authtype, content = $contentpwd\n");
1.78      foxr     3967: 	my $availinfo = '';
1.91      albertel 3968: 	if($authtype eq 'krb4' or $authtype eq 'krb5') {
1.78      foxr     3969: 	    $availinfo = $contentpwd;
                   3970: 	}
1.79      foxr     3971: 
1.78      foxr     3972: 	return "$authtype:$availinfo";
                   3973:     }
                   3974:     else {
1.79      foxr     3975: 	Debug("Returning nouser");
1.78      foxr     3976: 	return "nouser";
                   3977:     }
1.1       albertel 3978: }
                   3979: 
1.84      albertel 3980: sub addline {
                   3981:     my ($fname,$hostid,$ip,$newline)=@_;
                   3982:     my $contents;
                   3983:     my $found=0;
                   3984:     my $expr='^'.$hostid.':'.$ip.':';
                   3985:     $expr =~ s/\./\\\./g;
1.134     albertel 3986:     my $sh;
1.84      albertel 3987:     if ($sh=IO::File->new("$fname.subscription")) {
                   3988: 	while (my $subline=<$sh>) {
                   3989: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
                   3990: 	}
                   3991: 	$sh->close();
                   3992:     }
                   3993:     $sh=IO::File->new(">$fname.subscription");
                   3994:     if ($contents) { print $sh $contents; }
                   3995:     if ($newline) { print $sh $newline; }
                   3996:     $sh->close();
                   3997:     return $found;
1.86      www      3998: }
                   3999: 
                   4000: sub getchat {
1.122     www      4001:     my ($cdom,$cname,$udom,$uname)=@_;
1.87      www      4002:     my %hash;
                   4003:     my $proname=&propath($cdom,$cname);
                   4004:     my @entries=();
1.88      albertel 4005:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   4006: 	    &GDBM_READER(),0640)) {
                   4007: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   4008: 	untie %hash;
1.123     www      4009:     }
1.124     www      4010:     my @participants=();
1.134     albertel 4011:     my $cutoff=time-60;
1.123     www      4012:     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
1.124     www      4013: 	    &GDBM_WRCREAT(),0640)) {
                   4014:         $hash{$uname.':'.$udom}=time;
1.123     www      4015:         foreach (sort keys %hash) {
                   4016: 	    if ($hash{$_}>$cutoff) {
1.124     www      4017: 		$participants[$#participants+1]='active_participant:'.$_;
1.123     www      4018:             }
                   4019:         }
                   4020:         untie %hash;
1.86      www      4021:     }
1.124     www      4022:     return (@participants,@entries);
1.86      www      4023: }
                   4024: 
                   4025: sub chatadd {
1.88      albertel 4026:     my ($cdom,$cname,$newchat)=@_;
                   4027:     my %hash;
                   4028:     my $proname=&propath($cdom,$cname);
                   4029:     my @entries=();
1.142     www      4030:     my $time=time;
1.88      albertel 4031:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   4032: 	    &GDBM_WRCREAT(),0640)) {
                   4033: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   4034: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
                   4035: 	my ($thentime,$idnum)=split(/\_/,$lastid);
                   4036: 	my $newid=$time.'_000000';
                   4037: 	if ($thentime==$time) {
                   4038: 	    $idnum=~s/^0+//;
                   4039: 	    $idnum++;
                   4040: 	    $idnum=substr('000000'.$idnum,-6,6);
                   4041: 	    $newid=$time.'_'.$idnum;
                   4042: 	}
                   4043: 	$hash{$newid}=$newchat;
                   4044: 	my $expired=$time-3600;
                   4045: 	foreach (keys %hash) {
                   4046: 	    my ($thistime)=($_=~/(\d+)\_/);
                   4047: 	    if ($thistime<$expired) {
1.89      www      4048: 		delete $hash{$_};
1.88      albertel 4049: 	    }
                   4050: 	}
                   4051: 	untie %hash;
1.142     www      4052:     }
                   4053:     {
                   4054: 	my $hfh;
                   4055: 	if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 
                   4056: 	    print $hfh "$time:".&unescape($newchat)."\n";
                   4057: 	}
1.86      www      4058:     }
1.84      albertel 4059: }
                   4060: 
                   4061: sub unsub {
                   4062:     my ($fname,$clientip)=@_;
                   4063:     my $result;
1.161     foxr     4064:     if (unlink("$fname.$clientname")) {
1.84      albertel 4065: 	$result="ok\n";
                   4066:     } else {
                   4067: 	$result="not_subscribed\n";
                   4068:     }
                   4069:     if (-e "$fname.subscription") {
1.161     foxr     4070: 	my $found=&addline($fname,$clientname,$clientip,'');
1.84      albertel 4071: 	if ($found) { $result="ok\n"; }
                   4072:     } else {
                   4073: 	if ($result != "ok\n") { $result="not_subscribed\n"; }
                   4074:     }
                   4075:     return $result;
                   4076: }
                   4077: 
1.101     www      4078: sub currentversion {
                   4079:     my $fname=shift;
                   4080:     my $version=-1;
                   4081:     my $ulsdir='';
                   4082:     if ($fname=~/^(.+)\/[^\/]+$/) {
                   4083:        $ulsdir=$1;
                   4084:     }
1.114     albertel 4085:     my ($fnamere1,$fnamere2);
                   4086:     # remove version if already specified
1.101     www      4087:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114     albertel 4088:     # get the bits that go before and after the version number
                   4089:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
                   4090: 	$fnamere1=$1;
                   4091: 	$fnamere2='.'.$2;
                   4092:     }
1.101     www      4093:     if (-e $fname) { $version=1; }
                   4094:     if (-e $ulsdir) {
1.134     albertel 4095: 	if(-d $ulsdir) {
                   4096: 	    if (opendir(LSDIR,$ulsdir)) {
                   4097: 		my $ulsfn;
                   4098: 		while ($ulsfn=readdir(LSDIR)) {
1.101     www      4099: # see if this is a regular file (ignore links produced earlier)
1.134     albertel 4100: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
                   4101: 		    unless (-l $thisfile) {
1.160     www      4102: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134     albertel 4103: 			    if ($1>$version) { $version=$1; }
                   4104: 			}
                   4105: 		    }
                   4106: 		}
                   4107: 		closedir(LSDIR);
                   4108: 		$version++;
                   4109: 	    }
                   4110: 	}
                   4111:     }
                   4112:     return $version;
1.101     www      4113: }
                   4114: 
                   4115: sub thisversion {
                   4116:     my $fname=shift;
                   4117:     my $version=-1;
                   4118:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
                   4119: 	$version=$1;
                   4120:     }
                   4121:     return $version;
                   4122: }
                   4123: 
1.84      albertel 4124: sub subscribe {
                   4125:     my ($userinput,$clientip)=@_;
                   4126:     my $result;
                   4127:     my ($cmd,$fname)=split(/:/,$userinput);
                   4128:     my $ownership=&ishome($fname);
                   4129:     if ($ownership eq 'owner') {
1.101     www      4130: # explitly asking for the current version?
                   4131:         unless (-e $fname) {
                   4132:             my $currentversion=&currentversion($fname);
                   4133: 	    if (&thisversion($fname)==$currentversion) {
                   4134:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
                   4135: 		    my $root=$1;
                   4136:                     my $extension=$2;
                   4137:                     symlink($root.'.'.$extension,
                   4138:                             $root.'.'.$currentversion.'.'.$extension);
1.102     www      4139:                     unless ($extension=~/\.meta$/) {
                   4140:                        symlink($root.'.'.$extension.'.meta',
                   4141:                             $root.'.'.$currentversion.'.'.$extension.'.meta');
                   4142: 		    }
1.101     www      4143:                 }
                   4144:             }
                   4145:         }
1.84      albertel 4146: 	if (-e $fname) {
                   4147: 	    if (-d $fname) {
                   4148: 		$result="directory\n";
                   4149: 	    } else {
1.161     foxr     4150: 		if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134     albertel 4151: 		my $now=time;
1.161     foxr     4152: 		my $found=&addline($fname,$clientname,$clientip,
                   4153: 				   "$clientname:$clientip:$now\n");
1.84      albertel 4154: 		if ($found) { $result="$fname\n"; }
                   4155: 		# if they were subscribed to only meta data, delete that
                   4156:                 # subscription, when you subscribe to a file you also get
                   4157:                 # the metadata
                   4158: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
                   4159: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
                   4160: 		$fname="http://$thisserver/".$fname;
                   4161: 		$result="$fname\n";
                   4162: 	    }
                   4163: 	} else {
                   4164: 	    $result="not_found\n";
                   4165: 	}
                   4166:     } else {
                   4167: 	$result="rejected\n";
                   4168:     }
                   4169:     return $result;
                   4170: }
1.91      albertel 4171: 
                   4172: sub make_passwd_file {
1.98      foxr     4173:     my ($uname, $umode,$npass,$passfilename)=@_;
1.91      albertel 4174:     my $result="ok\n";
                   4175:     if ($umode eq 'krb4' or $umode eq 'krb5') {
                   4176: 	{
                   4177: 	    my $pf = IO::File->new(">$passfilename");
                   4178: 	    print $pf "$umode:$npass\n";
                   4179: 	}
                   4180:     } elsif ($umode eq 'internal') {
                   4181: 	my $salt=time;
                   4182: 	$salt=substr($salt,6,2);
                   4183: 	my $ncpass=crypt($npass,$salt);
                   4184: 	{
                   4185: 	    &Debug("Creating internal auth");
                   4186: 	    my $pf = IO::File->new(">$passfilename");
                   4187: 	    print $pf "internal:$ncpass\n"; 
                   4188: 	}
                   4189:     } elsif ($umode eq 'localauth') {
                   4190: 	{
                   4191: 	    my $pf = IO::File->new(">$passfilename");
                   4192: 	    print $pf "localauth:$npass\n";
                   4193: 	}
                   4194:     } elsif ($umode eq 'unix') {
                   4195: 	{
                   4196: 	    my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
                   4197: 	    {
                   4198: 		&Debug("Executing external: ".$execpath);
1.98      foxr     4199: 		&Debug("user  = ".$uname.", Password =". $npass);
1.132     matthew  4200: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91      albertel 4201: 		print $se "$uname\n";
                   4202: 		print $se "$npass\n";
                   4203: 		print $se "$npass\n";
1.97      foxr     4204: 	    }
                   4205: 	    my $useraddok = $?;
                   4206: 	    if($useraddok > 0) {
                   4207: 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
1.91      albertel 4208: 	    }
                   4209: 	    my $pf = IO::File->new(">$passfilename");
                   4210: 	    print $pf "unix:\n";
                   4211: 	}
                   4212:     } elsif ($umode eq 'none') {
                   4213: 	{
                   4214: 	    my $pf = IO::File->new(">$passfilename");
                   4215: 	    print $pf "none:\n";
                   4216: 	}
                   4217:     } else {
                   4218: 	$result="auth_mode_error\n";
                   4219:     }
                   4220:     return $result;
1.121     albertel 4221: }
                   4222: 
                   4223: sub sethost {
                   4224:     my ($remotereq) = @_;
                   4225:     my (undef,$hostid)=split(/:/,$remotereq);
                   4226:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
                   4227:     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
                   4228: 	$currenthostid=$hostid;
                   4229: 	$currentdomainid=$hostdom{$hostid};
                   4230: 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
                   4231:     } else {
                   4232: 	&logthis("Requested host id $hostid not an alias of ".
                   4233: 		 $perlvar{'lonHostID'}." refusing connection");
                   4234: 	return 'unable_to_set';
                   4235:     }
                   4236:     return 'ok';
                   4237: }
                   4238: 
                   4239: sub version {
                   4240:     my ($userinput)=@_;
                   4241:     $remoteVERSION=(split(/:/,$userinput))[1];
                   4242:     return "version:$VERSION";
1.127     albertel 4243: }
1.178.2.1! foxr     4244: ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<<
1.128     albertel 4245: #There is a copy of this in lonnet.pm
1.178.2.1! foxr     4246: #   Can we hoist these lil' things out into common places?
        !          4247: #
1.127     albertel 4248: sub userload {
                   4249:     my $numusers=0;
                   4250:     {
                   4251: 	opendir(LONIDS,$perlvar{'lonIDsDir'});
                   4252: 	my $filename;
                   4253: 	my $curtime=time;
                   4254: 	while ($filename=readdir(LONIDS)) {
                   4255: 	    if ($filename eq '.' || $filename eq '..') {next;}
1.138     albertel 4256: 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159     albertel 4257: 	    if ($curtime-$mtime < 1800) { $numusers++; }
1.127     albertel 4258: 	}
                   4259: 	closedir(LONIDS);
                   4260:     }
                   4261:     my $userloadpercent=0;
                   4262:     my $maxuserload=$perlvar{'lonUserLoadLim'};
                   4263:     if ($maxuserload) {
1.129     albertel 4264: 	$userloadpercent=100*$numusers/$maxuserload;
1.127     albertel 4265:     }
1.130     albertel 4266:     $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127     albertel 4267:     return $userloadpercent;
1.91      albertel 4268: }
                   4269: 
1.61      harris41 4270: # ----------------------------------- POD (plain old documentation, CPAN style)
                   4271: 
                   4272: =head1 NAME
                   4273: 
                   4274: lond - "LON Daemon" Server (port "LOND" 5663)
                   4275: 
                   4276: =head1 SYNOPSIS
                   4277: 
1.74      harris41 4278: Usage: B<lond>
                   4279: 
                   4280: Should only be run as user=www.  This is a command-line script which
                   4281: is invoked by B<loncron>.  There is no expectation that a typical user
                   4282: will manually start B<lond> from the command-line.  (In other words,
                   4283: DO NOT START B<lond> YOURSELF.)
1.61      harris41 4284: 
                   4285: =head1 DESCRIPTION
                   4286: 
1.74      harris41 4287: There are two characteristics associated with the running of B<lond>,
                   4288: PROCESS MANAGEMENT (starting, stopping, handling child processes)
                   4289: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
                   4290: subscriptions, etc).  These are described in two large
                   4291: sections below.
                   4292: 
                   4293: B<PROCESS MANAGEMENT>
                   4294: 
1.61      harris41 4295: Preforker - server who forks first. Runs as a daemon. HUPs.
                   4296: Uses IDEA encryption
                   4297: 
1.74      harris41 4298: B<lond> forks off children processes that correspond to the other servers
                   4299: in the network.  Management of these processes can be done at the
                   4300: parent process level or the child process level.
                   4301: 
                   4302: B<logs/lond.log> is the location of log messages.
                   4303: 
                   4304: The process management is now explained in terms of linux shell commands,
                   4305: subroutines internal to this code, and signal assignments:
                   4306: 
                   4307: =over 4
                   4308: 
                   4309: =item *
                   4310: 
                   4311: PID is stored in B<logs/lond.pid>
                   4312: 
                   4313: This is the process id number of the parent B<lond> process.
                   4314: 
                   4315: =item *
                   4316: 
                   4317: SIGTERM and SIGINT
                   4318: 
                   4319: Parent signal assignment:
                   4320:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   4321: 
                   4322: Child signal assignment:
                   4323:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
                   4324: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
                   4325:  to restart a new child.)
                   4326: 
                   4327: Command-line invocations:
                   4328:  B<kill> B<-s> SIGTERM I<PID>
                   4329:  B<kill> B<-s> SIGINT I<PID>
                   4330: 
                   4331: Subroutine B<HUNTSMAN>:
                   4332:  This is only invoked for the B<lond> parent I<PID>.
                   4333: This kills all the children, and then the parent.
                   4334: The B<lonc.pid> file is cleared.
                   4335: 
                   4336: =item *
                   4337: 
                   4338: SIGHUP
                   4339: 
                   4340: Current bug:
                   4341:  This signal can only be processed the first time
                   4342: on the parent process.  Subsequent SIGHUP signals
                   4343: have no effect.
                   4344: 
                   4345: Parent signal assignment:
                   4346:  $SIG{HUP}  = \&HUPSMAN;
                   4347: 
                   4348: Child signal assignment:
                   4349:  none (nothing happens)
                   4350: 
                   4351: Command-line invocations:
                   4352:  B<kill> B<-s> SIGHUP I<PID>
                   4353: 
                   4354: Subroutine B<HUPSMAN>:
                   4355:  This is only invoked for the B<lond> parent I<PID>,
                   4356: This kills all the children, and then the parent.
                   4357: The B<lond.pid> file is cleared.
                   4358: 
                   4359: =item *
                   4360: 
                   4361: SIGUSR1
                   4362: 
                   4363: Parent signal assignment:
                   4364:  $SIG{USR1} = \&USRMAN;
                   4365: 
                   4366: Child signal assignment:
                   4367:  $SIG{USR1}= \&logstatus;
                   4368: 
                   4369: Command-line invocations:
                   4370:  B<kill> B<-s> SIGUSR1 I<PID>
                   4371: 
                   4372: Subroutine B<USRMAN>:
                   4373:  When invoked for the B<lond> parent I<PID>,
                   4374: SIGUSR1 is sent to all the children, and the status of
                   4375: each connection is logged.
1.144     foxr     4376: 
                   4377: =item *
                   4378: 
                   4379: SIGUSR2
                   4380: 
                   4381: Parent Signal assignment:
                   4382:     $SIG{USR2} = \&UpdateHosts
                   4383: 
                   4384: Child signal assignment:
                   4385:     NONE
                   4386: 
1.74      harris41 4387: 
                   4388: =item *
                   4389: 
                   4390: SIGCHLD
                   4391: 
                   4392: Parent signal assignment:
                   4393:  $SIG{CHLD} = \&REAPER;
                   4394: 
                   4395: Child signal assignment:
                   4396:  none
                   4397: 
                   4398: Command-line invocations:
                   4399:  B<kill> B<-s> SIGCHLD I<PID>
                   4400: 
                   4401: Subroutine B<REAPER>:
                   4402:  This is only invoked for the B<lond> parent I<PID>.
                   4403: Information pertaining to the child is removed.
                   4404: The socket port is cleaned up.
                   4405: 
                   4406: =back
                   4407: 
                   4408: B<SERVER-SIDE ACTIVITIES>
                   4409: 
                   4410: Server-side information can be accepted in an encrypted or non-encrypted
                   4411: method.
                   4412: 
                   4413: =over 4
                   4414: 
                   4415: =item ping
                   4416: 
                   4417: Query a client in the hosts.tab table; "Are you there?"
                   4418: 
                   4419: =item pong
                   4420: 
                   4421: Respond to a ping query.
                   4422: 
                   4423: =item ekey
                   4424: 
                   4425: Read in encrypted key, make cipher.  Respond with a buildkey.
                   4426: 
                   4427: =item load
                   4428: 
                   4429: Respond with CPU load based on a computation upon /proc/loadavg.
                   4430: 
                   4431: =item currentauth
                   4432: 
                   4433: Reply with current authentication information (only over an
                   4434: encrypted channel).
                   4435: 
                   4436: =item auth
                   4437: 
                   4438: Only over an encrypted channel, reply as to whether a user's
                   4439: authentication information can be validated.
                   4440: 
                   4441: =item passwd
                   4442: 
                   4443: Allow for a password to be set.
                   4444: 
                   4445: =item makeuser
                   4446: 
                   4447: Make a user.
                   4448: 
                   4449: =item passwd
                   4450: 
                   4451: Allow for authentication mechanism and password to be changed.
                   4452: 
                   4453: =item home
1.61      harris41 4454: 
1.74      harris41 4455: Respond to a question "are you the home for a given user?"
                   4456: 
                   4457: =item update
                   4458: 
                   4459: Update contents of a subscribed resource.
                   4460: 
                   4461: =item unsubscribe
                   4462: 
                   4463: The server is unsubscribing from a resource.
                   4464: 
                   4465: =item subscribe
                   4466: 
                   4467: The server is subscribing to a resource.
                   4468: 
                   4469: =item log
                   4470: 
                   4471: Place in B<logs/lond.log>
                   4472: 
                   4473: =item put
                   4474: 
                   4475: stores hash in namespace
                   4476: 
                   4477: =item rolesput
                   4478: 
                   4479: put a role into a user's environment
                   4480: 
                   4481: =item get
                   4482: 
                   4483: returns hash with keys from array
                   4484: reference filled in from namespace
                   4485: 
                   4486: =item eget
                   4487: 
                   4488: returns hash with keys from array
                   4489: reference filled in from namesp (encrypts the return communication)
                   4490: 
                   4491: =item rolesget
                   4492: 
                   4493: get a role from a user's environment
                   4494: 
                   4495: =item del
                   4496: 
                   4497: deletes keys out of array from namespace
                   4498: 
                   4499: =item keys
                   4500: 
                   4501: returns namespace keys
                   4502: 
                   4503: =item dump
                   4504: 
                   4505: dumps the complete (or key matching regexp) namespace into a hash
                   4506: 
                   4507: =item store
                   4508: 
                   4509: stores hash permanently
                   4510: for this url; hashref needs to be given and should be a \%hashname; the
                   4511: remaining args aren't required and if they aren't passed or are '' they will
                   4512: be derived from the ENV
                   4513: 
                   4514: =item restore
                   4515: 
                   4516: returns a hash for a given url
                   4517: 
                   4518: =item querysend
                   4519: 
                   4520: Tells client about the lonsql process that has been launched in response
                   4521: to a sent query.
                   4522: 
                   4523: =item queryreply
                   4524: 
                   4525: Accept information from lonsql and make appropriate storage in temporary
                   4526: file space.
                   4527: 
                   4528: =item idput
                   4529: 
                   4530: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
                   4531: for each student, defined perhaps by the institutional Registrar.)
                   4532: 
                   4533: =item idget
                   4534: 
                   4535: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
                   4536: for each student, defined perhaps by the institutional Registrar.)
                   4537: 
                   4538: =item tmpput
                   4539: 
                   4540: Accept and store information in temporary space.
                   4541: 
                   4542: =item tmpget
                   4543: 
                   4544: Send along temporarily stored information.
                   4545: 
                   4546: =item ls
                   4547: 
                   4548: List part of a user's directory.
                   4549: 
1.135     foxr     4550: =item pushtable
                   4551: 
                   4552: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
                   4553: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
                   4554: must be restored manually in case of a problem with the new table file.
                   4555: pushtable requires that the request be encrypted and validated via
                   4556: ValidateManager.  The form of the command is:
                   4557: enc:pushtable tablename <tablecontents> \n
                   4558: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
                   4559: cleartext newline.
                   4560: 
1.74      harris41 4561: =item Hanging up (exit or init)
                   4562: 
                   4563: What to do when a client tells the server that they (the client)
                   4564: are leaving the network.
                   4565: 
                   4566: =item unknown command
                   4567: 
                   4568: If B<lond> is sent an unknown command (not in the list above),
                   4569: it replys to the client "unknown_cmd".
1.135     foxr     4570: 
1.74      harris41 4571: 
                   4572: =item UNKNOWN CLIENT
                   4573: 
                   4574: If the anti-spoofing algorithm cannot verify the client,
                   4575: the client is rejected (with a "refused" message sent
                   4576: to the client, and the connection is closed.
                   4577: 
                   4578: =back
1.61      harris41 4579: 
                   4580: =head1 PREREQUISITES
                   4581: 
                   4582: IO::Socket
                   4583: IO::File
                   4584: Apache::File
                   4585: Symbol
                   4586: POSIX
                   4587: Crypt::IDEA
                   4588: LWP::UserAgent()
                   4589: GDBM_File
                   4590: Authen::Krb4
1.91      albertel 4591: Authen::Krb5
1.61      harris41 4592: 
                   4593: =head1 COREQUISITES
                   4594: 
                   4595: =head1 OSNAMES
                   4596: 
                   4597: linux
                   4598: 
                   4599: =head1 SCRIPT CATEGORIES
                   4600: 
                   4601: Server/Process
                   4602: 
                   4603: =cut

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