Annotation of loncom/lond, revision 1.202

1.1       albertel    1: #!/usr/bin/perl
                      2: # The LearningOnline Network
                      3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60      www         4: #
1.202   ! raeburn     5: # $Id: lond,v 1.201 2004/06/21 14:08:20 matthew Exp $
1.60      www         6: #
                      7: # Copyright Michigan State University Board of Trustees
                      8: #
                      9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     10: #
                     11: # LON-CAPA is free software; you can redistribute it and/or modify
                     12: # it under the terms of the GNU General Public License as published by
1.167     foxr       13: # the Free Software Foundation; either version 2 of the License, or 
1.60      www        14: # (at your option) any later version.
                     15: #
                     16: # LON-CAPA is distributed in the hope that it will be useful,
                     17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     19: # GNU General Public License for more details.
                     20: #
                     21: # You should have received a copy of the GNU General Public License
                     22: # along with LON-CAPA; if not, write to the Free Software
1.178     foxr       23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
1.60      www        24: #
                     25: # /home/httpd/html/adm/gpl.txt
                     26: #
1.161     foxr       27: 
                     28: 
1.60      www        29: # http://www.lon-capa.org/
                     30: #
1.54      harris41   31: 
1.134     albertel   32: use strict;
1.80      harris41   33: use lib '/home/httpd/lib/perl/';
                     34: use LONCAPA::Configuration;
                     35: 
1.1       albertel   36: use IO::Socket;
                     37: use IO::File;
1.126     albertel   38: #use Apache::File;
1.1       albertel   39: use Symbol;
                     40: use POSIX;
                     41: use Crypt::IDEA;
                     42: use LWP::UserAgent();
1.3       www        43: use GDBM_File;
                     44: use Authen::Krb4;
1.91      albertel   45: use Authen::Krb5;
1.49      albertel   46: use lib '/home/httpd/lib/perl/';
                     47: use localauth;
1.193     raeburn    48: use localenroll;
1.143     foxr       49: use File::Copy;
1.169     foxr       50: use LONCAPA::ConfigFileEdit;
1.200     matthew    51: use LONCAPA::lonlocal;
                     52: use LONCAPA::lonssl;
1.1       albertel   53: 
1.200     matthew    54: my $DEBUG = 11;		       # Non zero to enable debug log entries.
1.77      foxr       55: 
1.57      www        56: my $status='';
                     57: my $lastlog='';
                     58: 
1.202   ! raeburn    59: my $VERSION='$Revision: 1.201 $'; #' stupid emacs
1.121     albertel   60: my $remoteVERSION;
1.115     albertel   61: my $currenthostid;
                     62: my $currentdomainid;
1.134     albertel   63: 
                     64: my $client;
1.200     matthew    65: my $clientip;			# IP address of client.
                     66: my $clientdns;			# DNS name of client.
                     67: my $clientname;			# LonCAPA name of client.
1.140     foxr       68: 
1.134     albertel   69: my $server;
1.200     matthew    70: my $thisserver;			# DNS of us.
                     71: 
                     72: my $keymode;
1.198     foxr       73: 
1.178     foxr       74: # 
                     75: #   Connection type is:
                     76: #      client                   - All client actions are allowed
                     77: #      manager                  - only management functions allowed.
                     78: #      both                     - Both management and client actions are allowed
                     79: #
1.161     foxr       80: 
1.178     foxr       81: my $ConnectionType;
1.161     foxr       82: 
1.200     matthew    83: my %hostid;			# ID's for hosts in cluster by ip.
                     84: my %hostdom;			# LonCAPA domain for hosts in cluster.
                     85: my %hostip;			# IPs for hosts in cluster.
                     86: my %hostdns;			# ID's of hosts looked up by DNS name.
1.161     foxr       87: 
1.178     foxr       88: my %managers;			# Ip -> manager names
1.161     foxr       89: 
1.178     foxr       90: my %perlvar;			# Will have the apache conf defined perl vars.
1.134     albertel   91: 
1.178     foxr       92: #
                     93: #  The array below are password error strings."
                     94: #
                     95: my $lastpwderror    = 13;		# Largest error number from lcpasswd.
                     96: my @passwderrors = ("ok",
                     97: 		   "lcpasswd must be run as user 'www'",
                     98: 		   "lcpasswd got incorrect number of arguments",
                     99: 		   "lcpasswd did not get the right nubmer of input text lines",
                    100: 		   "lcpasswd too many simultaneous pwd changes in progress",
                    101: 		   "lcpasswd User does not exist.",
                    102: 		   "lcpasswd Incorrect current passwd",
                    103: 		   "lcpasswd Unable to su to root.",
                    104: 		   "lcpasswd Cannot set new passwd.",
                    105: 		   "lcpasswd Username has invalid characters",
                    106: 		   "lcpasswd Invalid characters in password",
                    107: 		    "11", "12",
                    108: 		    "lcpasswd Password mismatch");
1.97      foxr      109: 
                    110: 
1.178     foxr      111: #  The array below are lcuseradd error strings.:
1.97      foxr      112: 
1.178     foxr      113: my $lastadderror = 13;
                    114: my @adderrors    = ("ok",
                    115: 		    "User ID mismatch, lcuseradd must run as user www",
                    116: 		    "lcuseradd Incorrect number of command line parameters must be 3",
                    117: 		    "lcuseradd Incorrect number of stdinput lines, must be 3",
                    118: 		    "lcuseradd Too many other simultaneous pwd changes in progress",
                    119: 		    "lcuseradd User does not exist",
                    120: 		    "lcuseradd Unable to make www member of users's group",
                    121: 		    "lcuseradd Unable to su to root",
                    122: 		    "lcuseradd Unable to set password",
                    123: 		    "lcuseradd Usrname has invalid characters",
                    124: 		    "lcuseradd Password has an invalid character",
                    125: 		    "lcuseradd User already exists",
                    126: 		    "lcuseradd Could not add user.",
                    127: 		    "lcuseradd Password mismatch");
1.97      foxr      128: 
1.96      foxr      129: 
1.200     matthew   130: #------------------------------------------------------------------------
                    131: #
                    132: #   LocalConnection
                    133: #     Completes the formation of a locally authenticated connection.
                    134: #     This function will ensure that the 'remote' client is really the
                    135: #     local host.  If not, the connection is closed, and the function fails.
                    136: #     If so, initcmd is parsed for the name of a file containing the
                    137: #     IDEA session key.  The fie is opened, read, deleted and the session
                    138: #     key returned to the caller.
                    139: #
                    140: # Parameters:
                    141: #   $Socket      - Socket open on client.
                    142: #   $initcmd     - The full text of the init command.
                    143: #
                    144: # Implicit inputs:
                    145: #    $clientdns  - The DNS name of the remote client.
                    146: #    $thisserver - Our DNS name.
                    147: #
                    148: # Returns:
                    149: #     IDEA session key on success.
                    150: #     undef on failure.
                    151: #
                    152: sub LocalConnection {
                    153:     my ($Socket, $initcmd) = @_;
                    154:     Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver");
                    155:     if($clientdns ne $thisserver) {
                    156: 	&logthis('<font color="red"> LocalConnection rejecting non local: '
                    157: 		 ."$clientdns ne $thisserver </font>");
                    158: 	close $Socket;
                    159: 	return undef;
                    160:     } 
                    161:     else {
                    162: 	chomp($initcmd);	# Get rid of \n in filename.
                    163: 	my ($init, $type, $name) = split(/:/, $initcmd);
                    164: 	Debug(" Init command: $init $type $name ");
                    165: 
                    166: 	# Require that $init = init, and $type = local:  Otherwise
                    167: 	# the caller is insane:
                    168: 
                    169: 	if(($init ne "init") && ($type ne "local")) {
                    170: 	    &logthis('<font color = "red"> LocalConnection: caller is insane! '
                    171: 		     ."init = $init, and type = $type </font>");
                    172: 	    close($Socket);;
                    173: 	    return undef;
                    174: 		
                    175: 	}
                    176: 	#  Now get the key filename:
                    177: 
                    178: 	my $IDEAKey = lonlocal::ReadKeyFile($name);
                    179: 	return $IDEAKey;
                    180:     }
                    181: }
                    182: #------------------------------------------------------------------------------
                    183: #
                    184: #  SSLConnection
                    185: #   Completes the formation of an ssh authenticated connection. The
                    186: #   socket is promoted to an ssl socket.  If this promotion and the associated
                    187: #   certificate exchange are successful, the IDEA key is generated and sent
                    188: #   to the remote peer via the SSL tunnel. The IDEA key is also returned to
                    189: #   the caller after the SSL tunnel is torn down.
                    190: #
                    191: # Parameters:
                    192: #   Name              Type             Purpose
                    193: #   $Socket          IO::Socket::INET  Plaintext socket.
                    194: #
                    195: # Returns:
                    196: #    IDEA key on success.
                    197: #    undef on failure.
                    198: #
                    199: sub SSLConnection {
                    200:     my $Socket   = shift;
                    201: 
                    202:     Debug("SSLConnection: ");
                    203:     my $KeyFile         = lonssl::KeyFile();
                    204:     if(!$KeyFile) {
                    205: 	my $err = lonssl::LastError();
                    206: 	&logthis("<font color=\"red\"> CRITICAL"
                    207: 		 ."Can't get key file $err </font>");
                    208: 	return undef;
                    209:     }
                    210:     my ($CACertificate,
                    211: 	$Certificate) = lonssl::CertificateFile();
                    212: 
                    213: 
                    214:     # If any of the key, certificate or certificate authority 
                    215:     # certificate filenames are not defined, this can't work.
                    216: 
                    217:     if((!$Certificate) || (!$CACertificate)) {
                    218: 	my $err = lonssl::LastError();
                    219: 	&logthis("<font color=\"red\"> CRITICAL"
                    220: 		 ."Can't get certificates: $err </font>");
                    221: 
                    222: 	return undef;
                    223:     }
                    224:     Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
                    225: 
                    226:     # Indicate to our peer that we can procede with
                    227:     # a transition to ssl authentication:
                    228: 
                    229:     print $Socket "ok:ssl\n";
                    230: 
                    231:     Debug("Approving promotion -> ssl");
                    232:     #  And do so:
                    233: 
                    234:     my $SSLSocket = lonssl::PromoteServerSocket($Socket,
                    235: 						$CACertificate,
                    236: 						$Certificate,
                    237: 						$KeyFile);
                    238:     if(! ($SSLSocket) ) {	# SSL socket promotion failed.
                    239: 	my $err = lonssl::LastError();
                    240: 	&logthis("<font color=\"red\"> CRITICAL "
                    241: 		 ."SSL Socket promotion failed: $err </font>");
                    242: 	return undef;
                    243:     }
                    244:     Debug("SSL Promotion successful");
                    245: 
                    246:     # 
                    247:     #  The only thing we'll use the socket for is to send the IDEA key
                    248:     #  to the peer:
                    249: 
                    250:     my $Key = lonlocal::CreateCipherKey();
                    251:     print $SSLSocket "$Key\n";
                    252: 
                    253:     lonssl::Close($SSLSocket); 
                    254: 
                    255:     Debug("Key exchange complete: $Key");
                    256: 
                    257:     return $Key;
                    258: }
                    259: #
                    260: #     InsecureConnection: 
                    261: #        If insecure connections are allowd,
                    262: #        exchange a challenge with the client to 'validate' the
                    263: #        client (not really, but that's the protocol):
                    264: #        We produce a challenge string that's sent to the client.
                    265: #        The client must then echo the challenge verbatim to us.
                    266: #
                    267: #  Parameter:
                    268: #      Socket      - Socket open on the client.
                    269: #  Returns:
                    270: #      1           - success.
                    271: #      0           - failure (e.g.mismatch or insecure not allowed).
                    272: #
                    273: sub InsecureConnection {
                    274:     my $Socket  =  shift;
                    275: 
                    276:     #   Don't even start if insecure connections are not allowed.
                    277: 
                    278:     if(! $perlvar{londAllowInsecure}) {	# Insecure connections not allowed.
                    279: 	return 0;
                    280:     }
                    281: 
                    282:     #   Fabricate a challenge string and send it..
                    283: 
                    284:     my $challenge = "$$".time;	# pid + time.
                    285:     print $Socket "$challenge\n";
                    286:     &status("Waiting for challenge reply");
                    287: 
                    288:     my $answer = <$Socket>;
                    289:     $answer    =~s/\W//g;
                    290:     if($challenge eq $answer) {
                    291: 	return 1;
                    292:     } 
                    293:     else {
                    294: 	logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
                    295: 	&status("No challenge reqply");
                    296: 	return 0;
                    297:     }
                    298:     
                    299: 
                    300: }
                    301: 
1.96      foxr      302: #
1.140     foxr      303: #   GetCertificate: Given a transaction that requires a certificate,
                    304: #   this function will extract the certificate from the transaction
                    305: #   request.  Note that at this point, the only concept of a certificate
                    306: #   is the hostname to which we are connected.
                    307: #
                    308: #   Parameter:
                    309: #      request   - The request sent by our client (this parameterization may
                    310: #                  need to change when we really use a certificate granting
                    311: #                  authority.
                    312: #
                    313: sub GetCertificate {
                    314:     my $request = shift;
                    315: 
                    316:     return $clientip;
                    317: }
1.161     foxr      318: 
1.178     foxr      319: #
                    320: #   Return true if client is a manager.
                    321: #
                    322: sub isManager {
                    323:     return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
                    324: }
                    325: #
                    326: #   Return tru if client can do client functions
                    327: #
                    328: sub isClient {
                    329:     return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
                    330: }
1.161     foxr      331: 
                    332: 
1.156     foxr      333: #
                    334: #   ReadManagerTable: Reads in the current manager table. For now this is
                    335: #                     done on each manager authentication because:
                    336: #                     - These authentications are not frequent
                    337: #                     - This allows dynamic changes to the manager table
                    338: #                       without the need to signal to the lond.
                    339: #
                    340: 
                    341: sub ReadManagerTable {
                    342: 
                    343:     #   Clean out the old table first..
                    344: 
1.166     foxr      345:    foreach my $key (keys %managers) {
                    346:       delete $managers{$key};
                    347:    }
                    348: 
                    349:    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
                    350:    if (!open (MANAGERS, $tablename)) {
                    351:       logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
                    352:       return;
                    353:    }
                    354:    while(my $host = <MANAGERS>) {
                    355:       chomp($host);
                    356:       if ($host =~ "^#") {                  # Comment line.
                    357:          logthis('<font color="green"> Skipping line: '. "$host</font>\n");
                    358:          next;
                    359:       }
                    360:       if (!defined $hostip{$host}) { # This is a non cluster member
1.161     foxr      361: 	    #  The entry is of the form:
                    362: 	    #    cluname:hostname
                    363: 	    #  cluname - A 'cluster hostname' is needed in order to negotiate
                    364: 	    #            the host key.
                    365: 	    #  hostname- The dns name of the host.
                    366: 	    #
1.166     foxr      367:           my($cluname, $dnsname) = split(/:/, $host);
                    368:           
                    369:           my $ip = gethostbyname($dnsname);
                    370:           if(defined($ip)) {                 # bad names don't deserve entry.
                    371:             my $hostip = inet_ntoa($ip);
                    372:             $managers{$hostip} = $cluname;
                    373:             logthis('<font color="green"> registering manager '.
                    374:                     "$dnsname as $cluname with $hostip </font>\n");
                    375:          }
                    376:       } else {
                    377:          logthis('<font color="green"> existing host'." $host</font>\n");
                    378:          $managers{$hostip{$host}} = $host;  # Use info from cluster tab if clumemeber
                    379:       }
                    380:    }
1.156     foxr      381: }
1.140     foxr      382: 
                    383: #
                    384: #  ValidManager: Determines if a given certificate represents a valid manager.
                    385: #                in this primitive implementation, the 'certificate' is
                    386: #                just the connecting loncapa client name.  This is checked
                    387: #                against a valid client list in the configuration.
                    388: #
                    389: #                  
                    390: sub ValidManager {
                    391:     my $certificate = shift; 
                    392: 
1.163     foxr      393:     return isManager;
1.140     foxr      394: }
                    395: #
1.143     foxr      396: #  CopyFile:  Called as part of the process of installing a 
                    397: #             new configuration file.  This function copies an existing
                    398: #             file to a backup file.
                    399: # Parameters:
                    400: #     oldfile  - Name of the file to backup.
                    401: #     newfile  - Name of the backup file.
                    402: # Return:
                    403: #     0   - Failure (errno has failure reason).
                    404: #     1   - Success.
                    405: #
                    406: sub CopyFile {
1.192     foxr      407: 
                    408:     my ($oldfile, $newfile) = @_;
1.143     foxr      409: 
                    410:     #  The file must exist:
                    411: 
                    412:     if(-e $oldfile) {
                    413: 
                    414: 	 # Read the old file.
                    415: 
                    416: 	my $oldfh = IO::File->new("< $oldfile");
                    417: 	if(!$oldfh) {
                    418: 	    return 0;
                    419: 	}
                    420: 	my @contents = <$oldfh>;  # Suck in the entire file.
                    421: 
                    422: 	# write the backup file:
                    423: 
                    424: 	my $newfh = IO::File->new("> $newfile");
                    425: 	if(!(defined $newfh)){
                    426: 	    return 0;
                    427: 	}
                    428: 	my $lines = scalar @contents;
                    429: 	for (my $i =0; $i < $lines; $i++) {
                    430: 	    print $newfh ($contents[$i]);
                    431: 	}
                    432: 
                    433: 	$oldfh->close;
                    434: 	$newfh->close;
                    435: 
                    436: 	chmod(0660, $newfile);
                    437: 
                    438: 	return 1;
                    439: 	    
                    440:     } else {
                    441: 	return 0;
                    442:     }
                    443: }
1.157     foxr      444: #
                    445: #  Host files are passed out with externally visible host IPs.
                    446: #  If, for example, we are behind a fire-wall or NAT host, our 
                    447: #  internally visible IP may be different than the externally
                    448: #  visible IP.  Therefore, we always adjust the contents of the
                    449: #  host file so that the entry for ME is the IP that we believe
                    450: #  we have.  At present, this is defined as the entry that
                    451: #  DNS has for us.  If by some chance we are not able to get a
                    452: #  DNS translation for us, then we assume that the host.tab file
                    453: #  is correct.  
                    454: #    BUGBUGBUG - in the future, we really should see if we can
                    455: #       easily query the interface(s) instead.
                    456: # Parameter(s):
                    457: #     contents    - The contents of the host.tab to check.
                    458: # Returns:
                    459: #     newcontents - The adjusted contents.
                    460: #
                    461: #
                    462: sub AdjustHostContents {
                    463:     my $contents  = shift;
                    464:     my $adjusted;
                    465:     my $me        = $perlvar{'lonHostID'};
                    466: 
1.166     foxr      467:  foreach my $line (split(/\n/,$contents)) {
1.157     foxr      468: 	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
                    469: 	    chomp($line);
                    470: 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
                    471: 	    if ($id eq $me) {
1.166     foxr      472:           my $ip = gethostbyname($name);
                    473:           my $ipnew = inet_ntoa($ip);
                    474:          $ip = $ipnew;
1.157     foxr      475: 		#  Reconstruct the host line and append to adjusted:
                    476: 		
1.166     foxr      477: 		   my $newline = "$id:$domain:$role:$name:$ip";
                    478: 		   if($maxcon ne "") { # Not all hosts have loncnew tuning params
                    479: 		     $newline .= ":$maxcon:$idleto:$mincon";
                    480: 		   }
                    481: 		   $adjusted .= $newline."\n";
1.157     foxr      482: 		
1.166     foxr      483:       } else {		# Not me, pass unmodified.
                    484: 		   $adjusted .= $line."\n";
                    485:       }
1.157     foxr      486: 	} else {                  # Blank or comment never re-written.
                    487: 	    $adjusted .= $line."\n";	# Pass blanks and comments as is.
                    488: 	}
1.166     foxr      489:  }
                    490:  return $adjusted;
1.157     foxr      491: }
1.143     foxr      492: #
                    493: #   InstallFile: Called to install an administrative file:
                    494: #       - The file is created with <name>.tmp
                    495: #       - The <name>.tmp file is then mv'd to <name>
                    496: #   This lugubrious procedure is done to ensure that we are never without
                    497: #   a valid, even if dated, version of the file regardless of who crashes
                    498: #   and when the crash occurs.
                    499: #
                    500: #  Parameters:
                    501: #       Name of the file
                    502: #       File Contents.
                    503: #  Return:
                    504: #      nonzero - success.
                    505: #      0       - failure and $! has an errno.
                    506: #
                    507: sub InstallFile {
1.192     foxr      508: 
                    509:     my ($Filename, $Contents) = @_;
1.143     foxr      510:     my $TempFile = $Filename.".tmp";
                    511: 
                    512:     #  Open the file for write:
                    513: 
                    514:     my $fh = IO::File->new("> $TempFile"); # Write to temp.
                    515:     if(!(defined $fh)) {
                    516: 	&logthis('<font color="red"> Unable to create '.$TempFile."</font>");
                    517: 	return 0;
                    518:     }
                    519:     #  write the contents of the file:
                    520: 
                    521:     print $fh ($Contents); 
                    522:     $fh->close;			# In case we ever have a filesystem w. locking
                    523: 
                    524:     chmod(0660, $TempFile);
                    525: 
                    526:     # Now we can move install the file in position.
                    527:     
                    528:     move($TempFile, $Filename);
                    529: 
                    530:     return 1;
                    531: }
1.200     matthew   532: 
                    533: 
1.169     foxr      534: #
                    535: #   ConfigFileFromSelector: converts a configuration file selector
                    536: #                 (one of host or domain at this point) into a 
                    537: #                 configuration file pathname.
                    538: #
                    539: #  Parameters:
                    540: #      selector  - Configuration file selector.
                    541: #  Returns:
                    542: #      Full path to the file or undef if the selector is invalid.
                    543: #
                    544: sub ConfigFileFromSelector {
                    545:     my $selector   = shift;
                    546:     my $tablefile;
                    547: 
                    548:     my $tabledir = $perlvar{'lonTabDir'}.'/';
                    549:     if ($selector eq "hosts") {
                    550: 	$tablefile = $tabledir."hosts.tab";
                    551:     } elsif ($selector eq "domain") {
                    552: 	$tablefile = $tabledir."domain.tab";
                    553:     } else {
                    554: 	return undef;
                    555:     }
                    556:     return $tablefile;
1.143     foxr      557: 
1.169     foxr      558: }
1.143     foxr      559: #
1.141     foxr      560: #   PushFile:  Called to do an administrative push of a file.
                    561: #              - Ensure the file being pushed is one we support.
                    562: #              - Backup the old file to <filename.saved>
                    563: #              - Separate the contents of the new file out from the
                    564: #                rest of the request.
                    565: #              - Write the new file.
                    566: #  Parameter:
                    567: #     Request - The entire user request.  This consists of a : separated
                    568: #               string pushfile:tablename:contents.
                    569: #     NOTE:  The contents may have :'s in it as well making things a bit
                    570: #            more interesting... but not much.
                    571: #  Returns:
                    572: #     String to send to client ("ok" or "refused" if bad file).
                    573: #
                    574: sub PushFile {
                    575:     my $request = shift;    
                    576:     my ($command, $filename, $contents) = split(":", $request, 3);
                    577:     
                    578:     #  At this point in time, pushes for only the following tables are
                    579:     #  supported:
                    580:     #   hosts.tab  ($filename eq host).
                    581:     #   domain.tab ($filename eq domain).
                    582:     # Construct the destination filename or reject the request.
                    583:     #
                    584:     # lonManage is supposed to ensure this, however this session could be
                    585:     # part of some elaborate spoof that managed somehow to authenticate.
                    586:     #
                    587: 
1.169     foxr      588: 
                    589:     my $tablefile = ConfigFileFromSelector($filename);
                    590:     if(! (defined $tablefile)) {
1.141     foxr      591: 	return "refused";
                    592:     }
                    593:     #
                    594:     # >copy< the old table to the backup table
                    595:     #        don't rename in case system crashes/reboots etc. in the time
                    596:     #        window between a rename and write.
                    597:     #
                    598:     my $backupfile = $tablefile;
                    599:     $backupfile    =~ s/\.tab$/.old/;
1.143     foxr      600:     if(!CopyFile($tablefile, $backupfile)) {
                    601: 	&logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
                    602: 	return "error:$!";
                    603:     }
1.141     foxr      604:     &logthis('<font color="green"> Pushfile: backed up '
                    605: 	    .$tablefile." to $backupfile</font>");
                    606:     
1.157     foxr      607:     #  If the file being pushed is the host file, we adjust the entry for ourself so that the
                    608:     #  IP will be our current IP as looked up in dns.  Note this is only 99% good as it's possible
                    609:     #  to conceive of conditions where we don't have a DNS entry locally.  This is possible in a 
                    610:     #  network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
                    611:     #  that possibilty.
                    612: 
                    613:     if($filename eq "host") {
                    614: 	$contents = AdjustHostContents($contents);
                    615:     }
                    616: 
1.141     foxr      617:     #  Install the new file:
                    618: 
1.143     foxr      619:     if(!InstallFile($tablefile, $contents)) {
                    620: 	&logthis('<font color="red"> Pushfile: unable to install '
1.145     foxr      621: 	 .$tablefile." $! </font>");
1.143     foxr      622: 	return "error:$!";
                    623:     }
                    624:     else {
                    625: 	&logthis('<font color="green"> Installed new '.$tablefile
                    626: 		 ."</font>");
                    627: 
                    628:     }
                    629: 
1.141     foxr      630: 
                    631:     #  Indicate success:
                    632:  
                    633:     return "ok";
                    634: 
                    635: }
1.145     foxr      636: 
                    637: #
                    638: #  Called to re-init either lonc or lond.
                    639: #
                    640: #  Parameters:
                    641: #    request   - The full request by the client.  This is of the form
                    642: #                reinit:<process>  
                    643: #                where <process> is allowed to be either of 
                    644: #                lonc or lond
                    645: #
                    646: #  Returns:
                    647: #     The string to be sent back to the client either:
                    648: #   ok         - Everything worked just fine.
                    649: #   error:why  - There was a failure and why describes the reason.
                    650: #
                    651: #
                    652: sub ReinitProcess {
                    653:     my $request = shift;
                    654: 
1.146     foxr      655: 
                    656:     # separate the request (reinit) from the process identifier and
                    657:     # validate it producing the name of the .pid file for the process.
                    658:     #
                    659:     #
                    660:     my ($junk, $process) = split(":", $request);
1.147     foxr      661:     my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146     foxr      662:     if($process eq 'lonc') {
                    663: 	$processpidfile = $processpidfile."lonc.pid";
1.147     foxr      664: 	if (!open(PIDFILE, "< $processpidfile")) {
                    665: 	    return "error:Open failed for $processpidfile";
                    666: 	}
                    667: 	my $loncpid = <PIDFILE>;
                    668: 	close(PIDFILE);
                    669: 	logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
                    670: 		."</font>");
                    671: 	kill("USR2", $loncpid);
1.146     foxr      672:     } elsif ($process eq 'lond') {
1.147     foxr      673: 	logthis('<font color="red"> Reinitializing self (lond) </font>');
                    674: 	&UpdateHosts;			# Lond is us!!
1.146     foxr      675:     } else {
                    676: 	&logthis('<font color="yellow" Invalid reinit request for '.$process
                    677: 		 ."</font>");
                    678: 	return "error:Invalid process identifier $process";
                    679:     }
1.145     foxr      680:     return 'ok';
                    681: }
1.168     foxr      682: #   Validate a line in a configuration file edit script:
                    683: #   Validation includes:
                    684: #     - Ensuring the command is valid.
                    685: #     - Ensuring the command has sufficient parameters
                    686: #   Parameters:
                    687: #     scriptline - A line to validate (\n has been stripped for what it's worth).
1.167     foxr      688: #
1.168     foxr      689: #   Return:
                    690: #      0     - Invalid scriptline.
                    691: #      1     - Valid scriptline
                    692: #  NOTE:
                    693: #     Only the command syntax is checked, not the executability of the
                    694: #     command.
                    695: #
                    696: sub isValidEditCommand {
                    697:     my $scriptline = shift;
                    698: 
                    699:     #   Line elements are pipe separated:
                    700: 
                    701:     my ($command, $key, $newline)  = split(/\|/, $scriptline);
                    702:     &logthis('<font color="green"> isValideditCommand checking: '.
                    703: 	     "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
                    704:     
                    705:     if ($command eq "delete") {
                    706: 	#
                    707: 	#   key with no newline.
                    708: 	#
                    709: 	if( ($key eq "") || ($newline ne "")) {
                    710: 	    return 0;		# Must have key but no newline.
                    711: 	} else {
                    712: 	    return 1;		# Valid syntax.
                    713: 	}
1.169     foxr      714:     } elsif ($command eq "replace") {
1.168     foxr      715: 	#
                    716: 	#   key and newline:
                    717: 	#
                    718: 	if (($key eq "") || ($newline eq "")) {
                    719: 	    return 0;
                    720: 	} else {
                    721: 	    return 1;
                    722: 	}
1.169     foxr      723:     } elsif ($command eq "append") {
                    724: 	if (($key ne "") && ($newline eq "")) {
                    725: 	    return 1;
                    726: 	} else {
                    727: 	    return 0;
                    728: 	}
1.168     foxr      729:     } else {
                    730: 	return 0;		# Invalid command.
                    731:     }
                    732:     return 0;			# Should not get here!!!
                    733: }
1.169     foxr      734: #
                    735: #   ApplyEdit - Applies an edit command to a line in a configuration 
                    736: #               file.  It is the caller's responsiblity to validate the
                    737: #               edit line.
                    738: #   Parameters:
                    739: #      $directive - A single edit directive to apply.  
                    740: #                   Edit directives are of the form:
                    741: #                  append|newline      - Appends a new line to the file.
                    742: #                  replace|key|newline - Replaces the line with key value 'key'
                    743: #                  delete|key          - Deletes the line with key value 'key'.
                    744: #      $editor   - A config file editor object that contains the
                    745: #                  file being edited.
                    746: #
                    747: sub ApplyEdit {
1.192     foxr      748: 
                    749:     my ($directive, $editor) = @_;
1.169     foxr      750: 
                    751:     # Break the directive down into its command and its parameters
                    752:     # (at most two at this point.  The meaning of the parameters, if in fact
                    753:     #  they exist depends on the command).
                    754: 
                    755:     my ($command, $p1, $p2) = split(/\|/, $directive);
                    756: 
                    757:     if($command eq "append") {
                    758: 	$editor->Append($p1);	          # p1 - key p2 null.
                    759:     } elsif ($command eq "replace") {
                    760: 	$editor->ReplaceLine($p1, $p2);   # p1 - key p2 = newline.
                    761:     } elsif ($command eq "delete") {
                    762: 	$editor->DeleteLine($p1);         # p1 - key p2 null.
                    763:     } else {			          # Should not get here!!!
                    764: 	die "Invalid command given to ApplyEdit $command"
                    765:     }
                    766: }
                    767: #
                    768: # AdjustOurHost:
                    769: #           Adjusts a host file stored in a configuration file editor object
                    770: #           for the true IP address of this host. This is necessary for hosts
                    771: #           that live behind a firewall.
                    772: #           Those hosts have a publicly distributed IP of the firewall, but
                    773: #           internally must use their actual IP.  We assume that a given
                    774: #           host only has a single IP interface for now.
                    775: # Formal Parameters:
                    776: #     editor   - The configuration file editor to adjust.  This
                    777: #                editor is assumed to contain a hosts.tab file.
                    778: # Strategy:
                    779: #    - Figure out our hostname.
                    780: #    - Lookup the entry for this host.
                    781: #    - Modify the line to contain our IP
                    782: #    - Do a replace for this host.
                    783: sub AdjustOurHost {
                    784:     my $editor        = shift;
                    785: 
                    786:     # figure out who I am.
                    787: 
                    788:     my $myHostName    = $perlvar{'lonHostID'}; # LonCAPA hostname.
                    789: 
                    790:     #  Get my host file entry.
                    791: 
                    792:     my $ConfigLine    = $editor->Find($myHostName);
                    793:     if(! (defined $ConfigLine)) {
                    794: 	die "AdjustOurHost - no entry for me in hosts file $myHostName";
                    795:     }
                    796:     # figure out my IP:
                    797:     #   Use the config line to get my hostname.
                    798:     #   Use gethostbyname to translate that into an IP address.
                    799:     #
                    800:     my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
                    801:     my $BinaryIp = gethostbyname($name);
                    802:     my $ip       = inet_ntoa($ip);
                    803:     #
                    804:     #  Reassemble the config line from the elements in the list.
                    805:     #  Note that if the loncnew items were not present before, they will
                    806:     #  be now even if they would be empty
                    807:     #
                    808:     my $newConfigLine = $id;
                    809:     foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
                    810: 	$newConfigLine .= ":".$item;
                    811:     }
                    812:     #  Replace the line:
                    813: 
                    814:     $editor->ReplaceLine($id, $newConfigLine);
                    815:     
                    816: }
                    817: #
                    818: #   ReplaceConfigFile:
                    819: #              Replaces a configuration file with the contents of a
                    820: #              configuration file editor object.
                    821: #              This is done by:
                    822: #              - Copying the target file to <filename>.old
                    823: #              - Writing the new file to <filename>.tmp
                    824: #              - Moving <filename.tmp>  -> <filename>
                    825: #              This laborious process ensures that the system is never without
                    826: #              a configuration file that's at least valid (even if the contents
                    827: #              may be dated).
                    828: #   Parameters:
                    829: #        filename   - Name of the file to modify... this is a full path.
                    830: #        editor     - Editor containing the file.
                    831: #
                    832: sub ReplaceConfigFile {
1.192     foxr      833:     
                    834:     my ($filename, $editor) = @_;
1.168     foxr      835: 
1.169     foxr      836:     CopyFile ($filename, $filename.".old");
                    837: 
                    838:     my $contents  = $editor->Get(); # Get the contents of the file.
                    839: 
                    840:     InstallFile($filename, $contents);
                    841: }
1.168     foxr      842: #   
                    843: #
                    844: #   Called to edit a configuration table  file
1.167     foxr      845: #   Parameters:
                    846: #      request           - The entire command/request sent by lonc or lonManage
                    847: #   Return:
                    848: #      The reply to send to the client.
1.168     foxr      849: #
1.167     foxr      850: sub EditFile {
                    851:     my $request = shift;
                    852: 
                    853:     #  Split the command into it's pieces:  edit:filetype:script
                    854: 
1.168     foxr      855:     my ($request, $filetype, $script) = split(/:/, $request,3);	# : in script
1.167     foxr      856: 
                    857:     #  Check the pre-coditions for success:
                    858: 
                    859:     if($request != "edit") {	# Something is amiss afoot alack.
                    860: 	return "error:edit request detected, but request != 'edit'\n";
                    861:     }
                    862:     if( ($filetype ne "hosts")  &&
                    863: 	($filetype ne "domain")) {
                    864: 	return "error:edit requested with invalid file specifier: $filetype \n";
                    865:     }
                    866: 
                    867:     #   Split the edit script and check it's validity.
1.168     foxr      868: 
                    869:     my @scriptlines = split(/\n/, $script);  # one line per element.
                    870:     my $linecount   = scalar(@scriptlines);
                    871:     for(my $i = 0; $i < $linecount; $i++) {
                    872: 	chomp($scriptlines[$i]);
                    873: 	if(!isValidEditCommand($scriptlines[$i])) {
                    874: 	    return "error:edit with bad script line: '$scriptlines[$i]' \n";
                    875: 	}
                    876:     }
1.145     foxr      877: 
1.167     foxr      878:     #   Execute the edit operation.
1.169     foxr      879:     #   - Create a config file editor for the appropriate file and 
                    880:     #   - execute each command in the script:
                    881:     #
                    882:     my $configfile = ConfigFileFromSelector($filetype);
                    883:     if (!(defined $configfile)) {
                    884: 	return "refused\n";
                    885:     }
                    886:     my $editor = ConfigFileEdit->new($configfile);
1.167     foxr      887: 
1.169     foxr      888:     for (my $i = 0; $i < $linecount; $i++) {
                    889: 	ApplyEdit($scriptlines[$i], $editor);
                    890:     }
                    891:     # If the file is the host file, ensure that our host is
                    892:     # adjusted to have our ip:
                    893:     #
                    894:     if($filetype eq "host") {
                    895: 	AdjustOurHost($editor);
                    896:     }
                    897:     #  Finally replace the current file with our file.
                    898:     #
                    899:     ReplaceConfigFile($configfile, $editor);
1.167     foxr      900: 
                    901:     return "ok\n";
                    902: }
1.141     foxr      903: #
1.96      foxr      904: #  Convert an error return code from lcpasswd to a string value.
                    905: #
                    906: sub lcpasswdstrerror {
                    907:     my $ErrorCode = shift;
1.97      foxr      908:     if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96      foxr      909: 	return "lcpasswd Unrecognized error return value ".$ErrorCode;
                    910:     } else {
1.98      foxr      911: 	return $passwderrors[$ErrorCode];
1.96      foxr      912:     }
                    913: }
                    914: 
1.97      foxr      915: #
                    916: # Convert an error return code from lcuseradd to a string value:
                    917: #
                    918: sub lcuseraddstrerror {
                    919:     my $ErrorCode = shift;
                    920:     if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
                    921: 	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
                    922:     } else {
1.98      foxr      923: 	return $adderrors[$ErrorCode];
1.97      foxr      924:     }
                    925: }
                    926: 
1.23      harris41  927: # grabs exception and records it to log before exiting
                    928: sub catchexception {
1.27      albertel  929:     my ($error)=@_;
1.25      www       930:     $SIG{'QUIT'}='DEFAULT';
                    931:     $SIG{__DIE__}='DEFAULT';
1.165     albertel  932:     &status("Catching exception");
1.190     albertel  933:     &logthis("<font color='red'>CRITICAL: "
1.134     albertel  934:      ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
1.27      albertel  935:      ."a crash with this error msg->[$error]</font>");
1.57      www       936:     &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27      albertel  937:     if ($client) { print $client "error: $error\n"; }
1.59      www       938:     $server->close();
1.27      albertel  939:     die($error);
1.23      harris41  940: }
                    941: 
1.63      www       942: sub timeout {
1.165     albertel  943:     &status("Handling Timeout");
1.190     albertel  944:     &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
1.63      www       945:     &catchexception('Timeout');
                    946: }
1.22      harris41  947: # -------------------------------- Set signal handlers to record abnormal exits
                    948: 
                    949: $SIG{'QUIT'}=\&catchexception;
                    950: $SIG{__DIE__}=\&catchexception;
                    951: 
1.81      matthew   952: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95      harris41  953: &status("Read loncapa.conf and loncapa_apache.conf");
                    954: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141     foxr      955: %perlvar=%{$perlvarref};
1.80      harris41  956: undef $perlvarref;
1.19      www       957: 
1.35      harris41  958: # ----------------------------- Make sure this process is running from user=www
                    959: my $wwwid=getpwnam('www');
                    960: if ($wwwid!=$<) {
1.134     albertel  961:    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                    962:    my $subj="LON: $currenthostid User ID mismatch";
1.37      harris41  963:    system("echo 'User ID mismatch.  lond must be run as user www.' |\
1.35      harris41  964:  mailto $emailto -s '$subj' > /dev/null");
                    965:    exit 1;
                    966: }
                    967: 
1.19      www       968: # --------------------------------------------- Check if other instance running
                    969: 
                    970: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
                    971: 
                    972: if (-e $pidfile) {
                    973:    my $lfh=IO::File->new("$pidfile");
                    974:    my $pide=<$lfh>;
                    975:    chomp($pide);
1.29      harris41  976:    if (kill 0 => $pide) { die "already running"; }
1.19      www       977: }
1.1       albertel  978: 
                    979: # ------------------------------------------------------------- Read hosts file
                    980: 
                    981: 
                    982: 
                    983: # establish SERVER socket, bind and listen.
                    984: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                    985:                                 Type      => SOCK_STREAM,
                    986:                                 Proto     => 'tcp',
                    987:                                 Reuse     => 1,
                    988:                                 Listen    => 10 )
1.29      harris41  989:   or die "making socket: $@\n";
1.1       albertel  990: 
                    991: # --------------------------------------------------------- Do global variables
                    992: 
                    993: # global variables
                    994: 
1.134     albertel  995: my %children               = ();       # keys are current child process IDs
1.1       albertel  996: 
                    997: sub REAPER {                        # takes care of dead children
                    998:     $SIG{CHLD} = \&REAPER;
1.165     albertel  999:     &status("Handling child death");
1.178     foxr     1000:     my $pid;
                   1001:     do {
                   1002: 	$pid = waitpid(-1,&WNOHANG());
                   1003: 	if (defined($children{$pid})) {
                   1004: 	    &logthis("Child $pid died");
                   1005: 	    delete($children{$pid});
1.183     albertel 1006: 	} elsif ($pid > 0) {
1.178     foxr     1007: 	    &logthis("Unknown Child $pid died");
                   1008: 	}
                   1009:     } while ( $pid > 0 );
                   1010:     foreach my $child (keys(%children)) {
                   1011: 	$pid = waitpid($child,&WNOHANG());
                   1012: 	if ($pid > 0) {
                   1013: 	    &logthis("Child $child - $pid looks like we missed it's death");
                   1014: 	    delete($children{$pid});
                   1015: 	}
1.176     albertel 1016:     }
1.165     albertel 1017:     &status("Finished Handling child death");
1.1       albertel 1018: }
                   1019: 
                   1020: sub HUNTSMAN {                      # signal handler for SIGINT
1.165     albertel 1021:     &status("Killing children (INT)");
1.1       albertel 1022:     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
                   1023:     kill 'INT' => keys %children;
1.59      www      1024:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1       albertel 1025:     my $execdir=$perlvar{'lonDaemons'};
                   1026:     unlink("$execdir/logs/lond.pid");
1.190     albertel 1027:     &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.165     albertel 1028:     &status("Done killing children");
1.1       albertel 1029:     exit;                           # clean up with dignity
                   1030: }
                   1031: 
                   1032: sub HUPSMAN {                      # signal handler for SIGHUP
                   1033:     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
1.165     albertel 1034:     &status("Killing children for restart (HUP)");
1.1       albertel 1035:     kill 'INT' => keys %children;
1.59      www      1036:     &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.190     albertel 1037:     &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.134     albertel 1038:     my $execdir=$perlvar{'lonDaemons'};
1.30      harris41 1039:     unlink("$execdir/logs/lond.pid");
1.165     albertel 1040:     &status("Restarting self (HUP)");
1.1       albertel 1041:     exec("$execdir/lond");         # here we go again
                   1042: }
                   1043: 
1.144     foxr     1044: #
1.148     foxr     1045: #    Kill off hashes that describe the host table prior to re-reading it.
                   1046: #    Hashes affected are:
1.200     matthew  1047: #       %hostid, %hostdom %hostip %hostdns.
1.148     foxr     1048: #
                   1049: sub KillHostHashes {
                   1050:     foreach my $key (keys %hostid) {
                   1051: 	delete $hostid{$key};
                   1052:     }
                   1053:     foreach my $key (keys %hostdom) {
                   1054: 	delete $hostdom{$key};
                   1055:     }
                   1056:     foreach my $key (keys %hostip) {
                   1057: 	delete $hostip{$key};
                   1058:     }
1.200     matthew  1059:     foreach my $key (keys %hostdns) {
                   1060: 	delete $hostdns{$key};
                   1061:     }
1.148     foxr     1062: }
                   1063: #
                   1064: #   Read in the host table from file and distribute it into the various hashes:
                   1065: #
                   1066: #    - %hostid  -  Indexed by IP, the loncapa hostname.
                   1067: #    - %hostdom -  Indexed by  loncapa hostname, the domain.
                   1068: #    - %hostip  -  Indexed by hostid, the Ip address of the host.
                   1069: sub ReadHostTable {
                   1070: 
                   1071:     open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
1.200     matthew  1072:     my $myloncapaname = $perlvar{'lonHostID'};
                   1073:     Debug("My loncapa name is : $myloncapaname");
1.148     foxr     1074:     while (my $configline=<CONFIG>) {
1.178     foxr     1075: 	if (!($configline =~ /^\s*\#/)) {
                   1076: 	    my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
                   1077: 	    chomp($ip); $ip=~s/\D+$//;
1.200     matthew  1078: 	    $hostid{$ip}=$id;         # LonCAPA name of host by IP.
                   1079: 	    $hostdom{$id}=$domain;    # LonCAPA domain name of host. 
                   1080: 	    $hostip{$id}=$ip;	      # IP address of host.
                   1081: 	    $hostdns{$name} = $id;    # LonCAPA name of host by DNS.
                   1082: 
                   1083: 	    if ($id eq $perlvar{'lonHostID'}) { 
                   1084: 		Debug("Found me in the host table: $name");
                   1085: 		$thisserver=$name; 
                   1086: 	    }
1.178     foxr     1087: 	}
1.148     foxr     1088:     }
                   1089:     close(CONFIG);
                   1090: }
                   1091: #
                   1092: #  Reload the Apache daemon's state.
1.150     foxr     1093: #  This is done by invoking /home/httpd/perl/apachereload
                   1094: #  a setuid perl script that can be root for us to do this job.
1.148     foxr     1095: #
                   1096: sub ReloadApache {
1.150     foxr     1097:     my $execdir = $perlvar{'lonDaemons'};
                   1098:     my $script  = $execdir."/apachereload";
                   1099:     system($script);
1.148     foxr     1100: }
                   1101: 
                   1102: #
1.144     foxr     1103: #   Called in response to a USR2 signal.
                   1104: #   - Reread hosts.tab
                   1105: #   - All children connected to hosts that were removed from hosts.tab
                   1106: #     are killed via SIGINT
                   1107: #   - All children connected to previously existing hosts are sent SIGUSR1
                   1108: #   - Our internal hosts hash is updated to reflect the new contents of
                   1109: #     hosts.tab causing connections from hosts added to hosts.tab to
                   1110: #     now be honored.
                   1111: #
                   1112: sub UpdateHosts {
1.165     albertel 1113:     &status("Reload hosts.tab");
1.147     foxr     1114:     logthis('<font color="blue"> Updating connections </font>');
1.148     foxr     1115:     #
                   1116:     #  The %children hash has the set of IP's we currently have children
                   1117:     #  on.  These need to be matched against records in the hosts.tab
                   1118:     #  Any ip's no longer in the table get killed off they correspond to
                   1119:     #  either dropped or changed hosts.  Note that the re-read of the table
                   1120:     #  will take care of new and changed hosts as connections come into being.
                   1121: 
                   1122: 
                   1123:     KillHostHashes;
                   1124:     ReadHostTable;
                   1125: 
                   1126:     foreach my $child (keys %children) {
                   1127: 	my $childip = $children{$child};
                   1128: 	if(!$hostid{$childip}) {
1.149     foxr     1129: 	    logthis('<font color="blue"> UpdateHosts killing child '
                   1130: 		    ." $child for ip $childip </font>");
1.148     foxr     1131: 	    kill('INT', $child);
1.149     foxr     1132: 	} else {
                   1133: 	    logthis('<font color="green"> keeping child for ip '
                   1134: 		    ." $childip (pid=$child) </font>");
1.148     foxr     1135: 	}
                   1136:     }
                   1137:     ReloadApache;
1.165     albertel 1138:     &status("Finished reloading hosts.tab");
1.144     foxr     1139: }
                   1140: 
1.148     foxr     1141: 
1.57      www      1142: sub checkchildren {
1.165     albertel 1143:     &status("Checking on the children (sending signals)");
1.57      www      1144:     &initnewstatus();
                   1145:     &logstatus();
                   1146:     &logthis('Going to check on the children');
1.134     albertel 1147:     my $docdir=$perlvar{'lonDocRoot'};
1.61      harris41 1148:     foreach (sort keys %children) {
1.57      www      1149: 	sleep 1;
                   1150:         unless (kill 'USR1' => $_) {
                   1151: 	    &logthis ('Child '.$_.' is dead');
                   1152:             &logstatus($$.' is dead');
                   1153:         } 
1.61      harris41 1154:     }
1.63      www      1155:     sleep 5;
1.113     albertel 1156:     $SIG{ALRM} = sub { die "timeout" };
                   1157:     $SIG{__DIE__} = 'DEFAULT';
1.165     albertel 1158:     &status("Checking on the children (waiting for reports)");
1.63      www      1159:     foreach (sort keys %children) {
                   1160:         unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.113     albertel 1161:           eval {
                   1162:             alarm(300);
1.63      www      1163: 	    &logthis('Child '.$_.' did not respond');
1.67      albertel 1164: 	    kill 9 => $_;
1.131     albertel 1165: 	    #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
                   1166: 	    #$subj="LON: $currenthostid killed lond process $_";
                   1167: 	    #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
                   1168: 	    #$execdir=$perlvar{'lonDaemons'};
                   1169: 	    #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
1.113     albertel 1170: 	    alarm(0);
                   1171: 	  }
1.63      www      1172:         }
                   1173:     }
1.113     albertel 1174:     $SIG{ALRM} = 'DEFAULT';
1.155     albertel 1175:     $SIG{__DIE__} = \&catchexception;
1.165     albertel 1176:     &status("Finished checking children");
1.57      www      1177: }
                   1178: 
1.1       albertel 1179: # --------------------------------------------------------------------- Logging
                   1180: 
                   1181: sub logthis {
                   1182:     my $message=shift;
                   1183:     my $execdir=$perlvar{'lonDaemons'};
                   1184:     my $fh=IO::File->new(">>$execdir/logs/lond.log");
                   1185:     my $now=time;
                   1186:     my $local=localtime($now);
1.58      www      1187:     $lastlog=$local.': '.$message;
1.1       albertel 1188:     print $fh "$local ($$): $message\n";
                   1189: }
                   1190: 
1.77      foxr     1191: # ------------------------- Conditional log if $DEBUG true.
                   1192: sub Debug {
                   1193:     my $message = shift;
                   1194:     if($DEBUG) {
                   1195: 	&logthis($message);
                   1196:     }
                   1197: }
1.161     foxr     1198: 
                   1199: #
                   1200: #   Sub to do replies to client.. this gives a hook for some
                   1201: #   debug tracing too:
                   1202: #  Parameters:
                   1203: #     fd      - File open on client.
                   1204: #     reply   - Text to send to client.
                   1205: #     request - Original request from client.
                   1206: #
                   1207: sub Reply {
1.192     foxr     1208: 
                   1209:     my ($fd, $reply, $request) = @_;
1.161     foxr     1210: 
                   1211:     print $fd $reply;
                   1212:     Debug("Request was $request  Reply was $reply");
                   1213: 
                   1214: }
1.57      www      1215: # ------------------------------------------------------------------ Log status
                   1216: 
                   1217: sub logstatus {
1.178     foxr     1218:     &status("Doing logging");
                   1219:     my $docdir=$perlvar{'lonDocRoot'};
                   1220:     {
                   1221:     my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
1.200     matthew  1222:     print $fh $$."\t".$clientname."\t".$currenthostid."\t"
                   1223: 	.$status."\t".$lastlog."\t $keymode\n";
1.178     foxr     1224:     $fh->close();
                   1225:     }
                   1226:     &status("Finished londstatus.txt");
                   1227:     {
                   1228: 	my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
1.200     matthew  1229:         print $fh $status."\n".$lastlog."\n".time."\n$keymode";
1.178     foxr     1230:         $fh->close();
                   1231:     }
                   1232:     &status("Finished logging");
1.57      www      1233: }
                   1234: 
                   1235: sub initnewstatus {
                   1236:     my $docdir=$perlvar{'lonDocRoot'};
                   1237:     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
                   1238:     my $now=time;
                   1239:     my $local=localtime($now);
                   1240:     print $fh "LOND status $local - parent $$\n\n";
1.64      www      1241:     opendir(DIR,"$docdir/lon-status/londchld");
1.134     albertel 1242:     while (my $filename=readdir(DIR)) {
1.64      www      1243:         unlink("$docdir/lon-status/londchld/$filename");
                   1244:     }
                   1245:     closedir(DIR);
1.57      www      1246: }
                   1247: 
                   1248: # -------------------------------------------------------------- Status setting
                   1249: 
                   1250: sub status {
                   1251:     my $what=shift;
                   1252:     my $now=time;
                   1253:     my $local=localtime($now);
1.178     foxr     1254:     $status=$local.': '.$what;
                   1255:     $0='lond: '.$what.' '.$local;
1.57      www      1256: }
1.11      www      1257: 
                   1258: # -------------------------------------------------------- Escape Special Chars
                   1259: 
                   1260: sub escape {
                   1261:     my $str=shift;
                   1262:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
                   1263:     return $str;
                   1264: }
                   1265: 
                   1266: # ----------------------------------------------------- Un-Escape Special Chars
                   1267: 
                   1268: sub unescape {
                   1269:     my $str=shift;
                   1270:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                   1271:     return $str;
                   1272: }
                   1273: 
1.1       albertel 1274: # ----------------------------------------------------------- Send USR1 to lonc
                   1275: 
                   1276: sub reconlonc {
                   1277:     my $peerfile=shift;
                   1278:     &logthis("Trying to reconnect for $peerfile");
                   1279:     my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
                   1280:     if (my $fh=IO::File->new("$loncfile")) {
                   1281: 	my $loncpid=<$fh>;
                   1282:         chomp($loncpid);
                   1283:         if (kill 0 => $loncpid) {
                   1284: 	    &logthis("lonc at pid $loncpid responding, sending USR1");
                   1285:             kill USR1 => $loncpid;
                   1286:         } else {
1.9       www      1287: 	    &logthis(
1.190     albertel 1288:               "<font color='red'>CRITICAL: "
1.9       www      1289:              ."lonc at pid $loncpid not responding, giving up</font>");
1.1       albertel 1290:         }
                   1291:     } else {
1.190     albertel 1292:       &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
1.1       albertel 1293:     }
                   1294: }
                   1295: 
                   1296: # -------------------------------------------------- Non-critical communication
1.11      www      1297: 
1.1       albertel 1298: sub subreply {
                   1299:     my ($cmd,$server)=@_;
                   1300:     my $peerfile="$perlvar{'lonSockDir'}/$server";
                   1301:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   1302:                                       Type    => SOCK_STREAM,
                   1303:                                       Timeout => 10)
                   1304:        or return "con_lost";
                   1305:     print $sclient "$cmd\n";
                   1306:     my $answer=<$sclient>;
                   1307:     chomp($answer);
                   1308:     if (!$answer) { $answer="con_lost"; }
                   1309:     return $answer;
                   1310: }
                   1311: 
                   1312: sub reply {
                   1313:   my ($cmd,$server)=@_;
                   1314:   my $answer;
1.115     albertel 1315:   if ($server ne $currenthostid) { 
1.1       albertel 1316:     $answer=subreply($cmd,$server);
                   1317:     if ($answer eq 'con_lost') {
                   1318: 	$answer=subreply("ping",$server);
                   1319:         if ($answer ne $server) {
1.115     albertel 1320: 	    &logthis("sub reply: answer != server answer is $answer, server is $server");
1.1       albertel 1321:            &reconlonc("$perlvar{'lonSockDir'}/$server");
                   1322:         }
                   1323:         $answer=subreply($cmd,$server);
                   1324:     }
                   1325:   } else {
                   1326:     $answer='self_reply';
                   1327:   } 
                   1328:   return $answer;
                   1329: }
                   1330: 
1.13      www      1331: # -------------------------------------------------------------- Talk to lonsql
                   1332: 
1.12      harris41 1333: sub sqlreply {
                   1334:     my ($cmd)=@_;
                   1335:     my $answer=subsqlreply($cmd);
                   1336:     if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
                   1337:     return $answer;
                   1338: }
                   1339: 
                   1340: sub subsqlreply {
                   1341:     my ($cmd)=@_;
                   1342:     my $unixsock="mysqlsock";
                   1343:     my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
                   1344:     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
                   1345:                                       Type    => SOCK_STREAM,
                   1346:                                       Timeout => 10)
                   1347:        or return "con_lost";
                   1348:     print $sclient "$cmd\n";
                   1349:     my $answer=<$sclient>;
                   1350:     chomp($answer);
                   1351:     if (!$answer) { $answer="con_lost"; }
                   1352:     return $answer;
                   1353: }
                   1354: 
1.1       albertel 1355: # -------------------------------------------- Return path to profile directory
1.11      www      1356: 
1.1       albertel 1357: sub propath {
                   1358:     my ($udom,$uname)=@_;
                   1359:     $udom=~s/\W//g;
                   1360:     $uname=~s/\W//g;
1.16      www      1361:     my $subdir=$uname.'__';
1.1       albertel 1362:     $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
                   1363:     my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
                   1364:     return $proname;
                   1365: } 
                   1366: 
                   1367: # --------------------------------------- Is this the home server of an author?
1.11      www      1368: 
1.1       albertel 1369: sub ishome {
                   1370:     my $author=shift;
                   1371:     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
                   1372:     my ($udom,$uname)=split(/\//,$author);
                   1373:     my $proname=propath($udom,$uname);
                   1374:     if (-e $proname) {
                   1375: 	return 'owner';
                   1376:     } else {
                   1377:         return 'not_owner';
                   1378:     }
                   1379: }
                   1380: 
                   1381: # ======================================================= Continue main program
                   1382: # ---------------------------------------------------- Fork once and dissociate
                   1383: 
1.134     albertel 1384: my $fpid=fork;
1.1       albertel 1385: exit if $fpid;
1.29      harris41 1386: die "Couldn't fork: $!" unless defined ($fpid);
1.1       albertel 1387: 
1.29      harris41 1388: POSIX::setsid() or die "Can't start new session: $!";
1.1       albertel 1389: 
                   1390: # ------------------------------------------------------- Write our PID on disk
                   1391: 
1.134     albertel 1392: my $execdir=$perlvar{'lonDaemons'};
1.1       albertel 1393: open (PIDSAVE,">$execdir/logs/lond.pid");
                   1394: print PIDSAVE "$$\n";
                   1395: close(PIDSAVE);
1.190     albertel 1396: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.57      www      1397: &status('Starting');
1.1       albertel 1398: 
1.106     foxr     1399: 
1.1       albertel 1400: 
                   1401: # ----------------------------------------------------- Install signal handlers
                   1402: 
1.57      www      1403: 
1.1       albertel 1404: $SIG{CHLD} = \&REAPER;
                   1405: $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   1406: $SIG{HUP}  = \&HUPSMAN;
1.57      www      1407: $SIG{USR1} = \&checkchildren;
1.144     foxr     1408: $SIG{USR2} = \&UpdateHosts;
1.106     foxr     1409: 
1.148     foxr     1410: #  Read the host hashes:
                   1411: 
                   1412: ReadHostTable;
1.106     foxr     1413: 
                   1414: # --------------------------------------------------------------
                   1415: #   Accept connections.  When a connection comes in, it is validated
                   1416: #   and if good, a child process is created to process transactions
                   1417: #   along the connection.
                   1418: 
1.1       albertel 1419: while (1) {
1.165     albertel 1420:     &status('Starting accept');
1.106     foxr     1421:     $client = $server->accept() or next;
1.165     albertel 1422:     &status('Accepted '.$client.' off to spawn');
1.106     foxr     1423:     make_new_child($client);
1.165     albertel 1424:     &status('Finished spawning');
1.1       albertel 1425: }
                   1426: 
                   1427: sub make_new_child {
                   1428:     my $pid;
1.178     foxr     1429:     my $cipher;
1.1       albertel 1430:     my $sigset;
1.106     foxr     1431: 
                   1432:     $client = shift;
1.165     albertel 1433:     &status('Starting new child '.$client);
1.161     foxr     1434:     &logthis('<font color="green"> Attempting to start child ('.$client.
                   1435: 	     ")</font>");    
1.1       albertel 1436:     # block signal for fork
                   1437:     $sigset = POSIX::SigSet->new(SIGINT);
                   1438:     sigprocmask(SIG_BLOCK, $sigset)
1.29      harris41 1439:         or die "Can't block SIGINT for fork: $!\n";
1.134     albertel 1440: 
1.29      harris41 1441:     die "fork: $!" unless defined ($pid = fork);
1.148     foxr     1442: 
                   1443:     $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
                   1444: 	                               # connection liveness.
                   1445: 
                   1446:     #
                   1447:     #  Figure out who we're talking to so we can record the peer in 
                   1448:     #  the pid hash.
                   1449:     #
                   1450:     my $caller = getpeername($client);
1.180     albertel 1451:     my ($port,$iaddr);
                   1452:     if (defined($caller) && length($caller) > 0) {
                   1453: 	($port,$iaddr)=unpack_sockaddr_in($caller);
                   1454:     } else {
                   1455: 	&logthis("Unable to determine who caller was, getpeername returned nothing");
                   1456:     }
                   1457:     if (defined($iaddr)) {
1.200     matthew  1458: 	$clientip  = inet_ntoa($iaddr);
                   1459: 	Debug("Connected with $clientip");
                   1460: 	$clientdns = gethostbyaddr($iaddr, AF_INET);
                   1461: 	Debug("Connected with $clientdns by name");
1.180     albertel 1462:     } else {
1.200     matthew  1463: 	&logthis("Unable to determine clientip");
1.180     albertel 1464: 	$clientip='Unavailable';
                   1465:     }
1.1       albertel 1466:     
                   1467:     if ($pid) {
                   1468:         # Parent records the child's birth and returns.
                   1469:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 1470:             or die "Can't unblock SIGINT for fork: $!\n";
1.148     foxr     1471:         $children{$pid} = $clientip;
1.57      www      1472:         &status('Started child '.$pid);
1.1       albertel 1473:         return;
                   1474:     } else {
                   1475:         # Child can *not* return from this subroutine.
                   1476:         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
1.126     albertel 1477:         $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns 
                   1478:                                 #don't get intercepted
1.57      www      1479:         $SIG{USR1}= \&logstatus;
1.63      www      1480:         $SIG{ALRM}= \&timeout;
1.57      www      1481:         $lastlog='Forked ';
                   1482:         $status='Forked';
                   1483: 
1.1       albertel 1484:         # unblock signals
                   1485:         sigprocmask(SIG_UNBLOCK, $sigset)
1.29      harris41 1486:             or die "Can't unblock SIGINT for fork: $!\n";
1.13      www      1487: 
1.178     foxr     1488:         my $tmpsnum=0;
                   1489: #---------------------------------------------------- kerberos 5 initialization
1.91      albertel 1490:         &Authen::Krb5::init_context();
                   1491:         &Authen::Krb5::init_ets();
                   1492: 
1.161     foxr     1493: 	&status('Accepted connection');
1.1       albertel 1494: # =============================================================================
                   1495:             # do something with the connection
                   1496: # -----------------------------------------------------------------------------
1.200     matthew  1497: 	# see if we know client and 'check' for spoof IP by ineffective challenge
1.148     foxr     1498: 
1.161     foxr     1499: 	ReadManagerTable;	# May also be a manager!!
                   1500: 	
                   1501: 	my $clientrec=($hostid{$clientip}     ne undef);
                   1502: 	my $ismanager=($managers{$clientip}    ne undef);
                   1503: 	$clientname  = "[unknonwn]";
                   1504: 	if($clientrec) {	# Establish client type.
                   1505: 	    $ConnectionType = "client";
                   1506: 	    $clientname = $hostid{$clientip};
                   1507: 	    if($ismanager) {
                   1508: 		$ConnectionType = "both";
                   1509: 	    }
                   1510: 	} else {
                   1511: 	    $ConnectionType = "manager";
                   1512: 	    $clientname = $managers{$clientip};
                   1513: 	}
                   1514: 	my $clientok;
1.200     matthew  1515: 
1.161     foxr     1516: 	if ($clientrec || $ismanager) {
                   1517: 	    &status("Waiting for init from $clientip $clientname");
                   1518: 	    &logthis('<font color="yellow">INFO: Connection, '.
                   1519: 		     $clientip.
                   1520: 		  " ($clientname) connection type = $ConnectionType </font>" );
                   1521: 	    &status("Connecting $clientip  ($clientname))"); 
                   1522: 	    my $remotereq=<$client>;
1.200     matthew  1523: 	    chomp($remotereq);
                   1524: 	    Debug("Got init: $remotereq");
                   1525: 	    my $inikeyword = split(/:/, $remotereq);
1.161     foxr     1526: 	    if ($remotereq =~ /^init/) {
                   1527: 		&sethost("sethost:$perlvar{'lonHostID'}");
1.200     matthew  1528: 		#
                   1529: 		#  If the remote is attempting a local init... give that a try:
                   1530: 		#
                   1531: 		my ($i, $inittype) = split(/:/, $remotereq);
                   1532: 
                   1533: 		# If the connection type is ssl, but I didn't get my
                   1534: 		# certificate files yet, then I'll drop  back to 
                   1535: 		# insecure (if allowed).
                   1536: 		
                   1537: 		if($inittype eq "ssl") {
                   1538: 		    my ($ca, $cert) = lonssl::CertificateFile;
                   1539: 		    my $kfile       = lonssl::KeyFile;
                   1540: 		    if((!$ca)   || 
                   1541: 		       (!$cert) || 
                   1542: 		       (!$kfile)) {
                   1543: 			$inittype = ""; # This forces insecure attempt.
                   1544: 			&logthis("<font color=\"blue\"> Certificates not "
                   1545: 				 ."installed -- trying insecure auth</font>");
                   1546: 		    }
                   1547: 		    else {	# SSL certificates are in place so
                   1548: 		    }		# Leave the inittype alone.
                   1549: 		}
                   1550: 
                   1551: 		if($inittype eq "local") {
                   1552: 		    my $key = LocalConnection($client, $remotereq);
                   1553: 		    if($key) {
                   1554: 			Debug("Got local key $key");
                   1555: 			$clientok     = 1;
                   1556: 			my $cipherkey = pack("H32", $key);
                   1557: 			$cipher       = new IDEA($cipherkey);
                   1558: 			print $client "ok:local\n";
                   1559: 			&logthis('<font color="green"'
                   1560: 				 . "Successful local authentication </font>");
                   1561: 			$keymode = "local"
                   1562: 		    } else {
                   1563: 			Debug("Failed to get local key");
                   1564: 			$clientok = 0;
                   1565: 			shutdown($client, 3);
                   1566: 			close $client;
                   1567: 		    }
                   1568: 		} elsif ($inittype eq "ssl") {
                   1569: 		    my $key = SSLConnection($client);
                   1570: 		    if ($key) {
                   1571: 			$clientok = 1;
                   1572: 			my $cipherkey = pack("H32", $key);
                   1573: 			$cipher       = new IDEA($cipherkey);
                   1574: 			&logthis('<font color="green">'
                   1575: 				 ."Successfull ssl authentication with $clientname </font>");
                   1576: 			$keymode = "ssl";
                   1577: 	     
                   1578: 		    } else {
                   1579: 			$clientok = 0;
                   1580: 			close $client;
                   1581: 		    }
                   1582: 	   
1.161     foxr     1583: 		} else {
1.200     matthew  1584: 		    my $ok = InsecureConnection($client);
                   1585: 		    if($ok) {
                   1586: 			$clientok = 1;
                   1587: 			&logthis('<font color="green">'
                   1588: 				 ."Successful insecure authentication with $clientname </font>");
                   1589: 			print $client "ok\n";
                   1590: 			$keymode = "insecure";
                   1591: 		    } else {
                   1592: 			&logthis('<font color="yellow">'
                   1593: 				  ."Attempted insecure connection disallowed </font>");
                   1594: 			close $client;
                   1595: 			$clientok = 0;
                   1596: 			
                   1597: 		    }
1.161     foxr     1598: 		}
1.2       www      1599: 	    } else {
1.161     foxr     1600: 		&logthis(
1.190     albertel 1601: 			 "<font color='blue'>WARNING: "
1.161     foxr     1602: 			 ."$clientip failed to initialize: >$remotereq< </font>");
                   1603: 		&status('No init '.$clientip);
                   1604: 	    }
1.200     matthew  1605: 	    
1.161     foxr     1606: 	} else {
                   1607: 	    &logthis(
1.190     albertel 1608: 		     "<font color='blue'>WARNING: Unknown client $clientip</font>");
1.161     foxr     1609: 	    &status('Hung up on '.$clientip);
                   1610: 	}
1.200     matthew  1611:  
1.161     foxr     1612: 	if ($clientok) {
1.1       albertel 1613: # ---------------- New known client connecting, could mean machine online again
1.161     foxr     1614: 	    
                   1615: 	    foreach my $id (keys(%hostip)) {
                   1616: 		if ($hostip{$id} ne $clientip ||
                   1617: 		    $hostip{$currenthostid} eq $clientip) {
                   1618: 		    # no need to try to do recon's to myself
                   1619: 		    next;
1.115     albertel 1620: 		}
1.161     foxr     1621: 		&reconlonc("$perlvar{'lonSockDir'}/$id");
                   1622: 	    }
1.190     albertel 1623: 	    &logthis("<font color='green'>Established connection: $clientname</font>");
1.161     foxr     1624: 	    &status('Will listen to '.$clientname);
1.178     foxr     1625: # ------------------------------------------------------------ Process requests
                   1626: 	    while (my $userinput=<$client>) {
                   1627:                 chomp($userinput);
                   1628: 		Debug("Request = $userinput\n");
                   1629:                 &status('Processing '.$clientname.': '.$userinput);
                   1630:                 my $wasenc=0;
                   1631:                 alarm(120);
                   1632: # ------------------------------------------------------------ See if encrypted
                   1633: 		if ($userinput =~ /^enc/) {
                   1634: 		    if ($cipher) {
                   1635: 			my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
                   1636: 			$userinput='';
                   1637: 			for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
                   1638: 			    $userinput.=
                   1639: 				$cipher->decrypt(
                   1640: 						 pack("H16",substr($encinput,$encidx,16))
                   1641: 						 );
                   1642: 			}
                   1643: 			$userinput=substr($userinput,0,$cmdlength);
                   1644: 			$wasenc=1;
                   1645: 		    }
                   1646: 		}
                   1647: 		
                   1648: # ------------------------------------------------------------- Normal commands
                   1649: # ------------------------------------------------------------------------ ping
                   1650: 		if ($userinput =~ /^ping/) {	# client only
                   1651: 		    if(isClient) {
                   1652: 			print $client "$currenthostid\n";
                   1653: 		    } else {
                   1654: 			Reply($client, "refused\n", $userinput);
                   1655: 		    }
                   1656: # ------------------------------------------------------------------------ pong
                   1657: 		}elsif ($userinput =~ /^pong/) { # client only
                   1658: 		    if(isClient) {
                   1659: 			my $reply=&reply("ping",$clientname);
                   1660: 			print $client "$currenthostid:$reply\n"; 
                   1661: 		    } else {
                   1662: 			Reply($client, "refused\n", $userinput);
                   1663: 		    }
                   1664: # ------------------------------------------------------------------------ ekey
                   1665: 		} elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs
                   1666: 		    my $buildkey=time.$$.int(rand 100000);
                   1667: 		    $buildkey=~tr/1-6/A-F/;
                   1668: 		    $buildkey=int(rand 100000).$buildkey.int(rand 100000);
                   1669: 		    my $key=$currenthostid.$clientname;
                   1670: 		    $key=~tr/a-z/A-Z/;
                   1671: 		    $key=~tr/G-P/0-9/;
                   1672: 		    $key=~tr/Q-Z/0-9/;
                   1673: 		    $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
                   1674: 		    $key=substr($key,0,32);
                   1675: 		    my $cipherkey=pack("H32",$key);
                   1676: 		    $cipher=new IDEA $cipherkey;
                   1677: 		    print $client "$buildkey\n"; 
                   1678: # ------------------------------------------------------------------------ load
                   1679: 		} elsif ($userinput =~ /^load/) { # client only
                   1680: 		    if (isClient) {
                   1681: 			my $loadavg;
                   1682: 			{
                   1683: 			    my $loadfile=IO::File->new('/proc/loadavg');
                   1684: 			    $loadavg=<$loadfile>;
                   1685: 			}
                   1686: 			$loadavg =~ s/\s.*//g;
                   1687: 			my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
                   1688: 			print $client "$loadpercent\n";
                   1689: 		    } else {
                   1690: 			Reply($client, "refused\n", $userinput);
                   1691: 	       
                   1692: 		    }
                   1693: # -------------------------------------------------------------------- userload
                   1694: 		} elsif ($userinput =~ /^userload/) { # client only
                   1695: 		    if(isClient) {
                   1696: 			my $userloadpercent=&userload();
                   1697: 			print $client "$userloadpercent\n";
                   1698: 		    } else {
                   1699: 			Reply($client, "refused\n", $userinput);
                   1700: 		     
                   1701: 		    }
                   1702: #
                   1703: #        Transactions requiring encryption:
                   1704: #
                   1705: # ----------------------------------------------------------------- currentauth
                   1706: 		} elsif ($userinput =~ /^currentauth/) {
                   1707: 		    if (($wasenc==1)  && isClient) { # Encoded & client only.
                   1708: 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
                   1709: 			my $result = GetAuthType($udom, $uname);
                   1710: 			if($result eq "nouser") {
                   1711: 			    print $client "unknown_user\n";
                   1712: 			}
                   1713: 			else {
                   1714: 			    print $client "$result\n"
                   1715: 			    }
                   1716: 		    } else {
                   1717: 			Reply($client, "refused\n", $userinput);
                   1718: 			
                   1719: 		    }
                   1720: #--------------------------------------------------------------------- pushfile
                   1721: 		} elsif($userinput =~ /^pushfile/) {	# encoded & manager.
                   1722: 		    if(($wasenc == 1) && isManager) {
                   1723: 			my $cert = GetCertificate($userinput);
                   1724: 			if(ValidManager($cert)) {
                   1725: 			    my $reply = PushFile($userinput);
                   1726: 			    print $client "$reply\n";
                   1727: 			} else {
                   1728: 			    print $client "refused\n";
                   1729: 			} 
                   1730: 		    } else {
                   1731: 			Reply($client, "refused\n", $userinput);
                   1732: 			
                   1733: 		    }
                   1734: #--------------------------------------------------------------------- reinit
                   1735: 		} elsif($userinput =~ /^reinit/) { # Encoded and manager
                   1736: 			if (($wasenc == 1) && isManager) {
                   1737: 				my $cert = GetCertificate($userinput);
                   1738: 				if(ValidManager($cert)) {
                   1739: 					chomp($userinput);
                   1740: 					my $reply = ReinitProcess($userinput);
                   1741: 					print $client  "$reply\n";
                   1742: 				} else {
                   1743: 					 print $client "refused\n";
                   1744: 				}
                   1745: 			} else {
                   1746: 				Reply($client, "refused\n", $userinput);
                   1747: 			}
                   1748: #------------------------------------------------------------------------- edit
                   1749: 		    } elsif ($userinput =~ /^edit/) {    # encoded and manager:
                   1750: 			if(($wasenc ==1) && (isManager)) {
                   1751: 			    my $cert = GetCertificate($userinput);
                   1752: 			    if(ValidManager($cert)) {
                   1753:                my($command, $filetype, $script) = split(/:/, $userinput);
                   1754:                if (($filetype eq "hosts") || ($filetype eq "domain")) {
                   1755:                   if($script ne "") {
                   1756: 		      Reply($client, EditFile($userinput));
                   1757:                   } else {
                   1758:                      Reply($client,"refused\n",$userinput);
                   1759:                   }
                   1760:                } else {
                   1761:                   Reply($client,"refused\n",$userinput);
                   1762:                }
                   1763:             } else {
                   1764:                Reply($client,"refused\n",$userinput);
                   1765:             }
                   1766:          } else {
                   1767: 	     Reply($client,"refused\n",$userinput);
                   1768: 	 }
                   1769: # ------------------------------------------------------------------------ auth
                   1770: 		    } elsif ($userinput =~ /^auth/) { # Encoded and client only.
                   1771: 		    if (($wasenc==1) && isClient) {
                   1772: 			my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
                   1773: 			chomp($upass);
                   1774: 			$upass=unescape($upass);
                   1775: 			my $proname=propath($udom,$uname);
                   1776: 			my $passfilename="$proname/passwd";
                   1777: 			if (-e $passfilename) {
                   1778: 			    my $pf = IO::File->new($passfilename);
                   1779: 			    my $realpasswd=<$pf>;
                   1780: 			    chomp($realpasswd);
                   1781: 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   1782: 			    my $pwdcorrect=0;
                   1783: 			    if ($howpwd eq 'internal') {
                   1784: 				&Debug("Internal auth");
                   1785: 				$pwdcorrect=
                   1786: 				    (crypt($upass,$contentpwd) eq $contentpwd);
                   1787: 			    } elsif ($howpwd eq 'unix') {
                   1788: 				&Debug("Unix auth");
                   1789: 				if((getpwnam($uname))[1] eq "") { #no such user!
                   1790: 				    $pwdcorrect = 0;
                   1791: 				} else {
                   1792: 				    $contentpwd=(getpwnam($uname))[1];
                   1793: 				    my $pwauth_path="/usr/local/sbin/pwauth";
                   1794: 				    unless ($contentpwd eq 'x') {
                   1795: 					$pwdcorrect=
                   1796: 					    (crypt($upass,$contentpwd) eq 
                   1797: 					     $contentpwd);
                   1798: 				    }
                   1799: 				    
                   1800: 				    elsif (-e $pwauth_path) {
                   1801: 					open PWAUTH, "|$pwauth_path" or
                   1802: 					    die "Cannot invoke authentication";
                   1803: 					print PWAUTH "$uname\n$upass\n";
                   1804: 					close PWAUTH;
                   1805: 					$pwdcorrect=!$?;
                   1806: 				    }
                   1807: 				}
                   1808: 			    } elsif ($howpwd eq 'krb4') {
                   1809: 				my $null=pack("C",0);
                   1810: 				unless ($upass=~/$null/) {
                   1811: 				    my $krb4_error = &Authen::Krb4::get_pw_in_tkt
                   1812: 					($uname,"",$contentpwd,'krbtgt',
                   1813: 					 $contentpwd,1,$upass);
                   1814: 				    if (!$krb4_error) {
                   1815: 					$pwdcorrect = 1;
                   1816: 				    } else { 
                   1817: 					$pwdcorrect=0; 
                   1818: 					# log error if it is not a bad password
                   1819: 					if ($krb4_error != 62) {
1.191     albertel 1820: 					    &logthis('krb4:'.$uname.','.
1.178     foxr     1821: 						     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
                   1822: 					}
                   1823: 				    }
                   1824: 				}
                   1825: 			    } elsif ($howpwd eq 'krb5') {
                   1826: 				my $null=pack("C",0);
                   1827: 				unless ($upass=~/$null/) {
                   1828: 				    my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
                   1829: 				    my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
                   1830: 				    my $krbserver=&Authen::Krb5::parse_name($krbservice);
                   1831: 				    my $credentials=&Authen::Krb5::cc_default();
                   1832: 				    $credentials->initialize($krbclient);
                   1833: 				    my $krbreturn = 
                   1834: 					&Authen::Krb5::get_in_tkt_with_password(
                   1835: 										$krbclient,$krbserver,$upass,$credentials);
                   1836: #				  unless ($krbreturn) {
                   1837: #				      &logthis("Krb5 Error: ".
                   1838: #					       &Authen::Krb5::error());
                   1839: #				  }
                   1840: 				    $pwdcorrect = ($krbreturn == 1);
                   1841: 				} else { $pwdcorrect=0; }
                   1842: 			    } elsif ($howpwd eq 'localauth') {
                   1843: 				$pwdcorrect=&localauth::localauth($uname,$upass,
                   1844: 								  $contentpwd);
                   1845: 			    }
                   1846: 			    if ($pwdcorrect) {
                   1847: 				print $client "authorized\n";
                   1848: 			    } else {
                   1849: 				print $client "non_authorized\n";
                   1850: 			    }  
                   1851: 			} else {
                   1852: 			    print $client "unknown_user\n";
                   1853: 			}
                   1854: 		    } else {
                   1855: 			Reply($client, "refused\n", $userinput);
                   1856: 		       
                   1857: 		    }
                   1858: # ---------------------------------------------------------------------- passwd
                   1859: 		} elsif ($userinput =~ /^passwd/) { # encoded and client
                   1860: 		    if (($wasenc==1) && isClient) {
                   1861: 			my 
                   1862: 			    ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
                   1863: 			chomp($npass);
                   1864: 			$upass=&unescape($upass);
                   1865: 			$npass=&unescape($npass);
                   1866: 			&Debug("Trying to change password for $uname");
                   1867: 			my $proname=propath($udom,$uname);
                   1868: 			my $passfilename="$proname/passwd";
                   1869: 			if (-e $passfilename) {
                   1870: 			    my $realpasswd;
                   1871: 			    { my $pf = IO::File->new($passfilename);
                   1872: 			      $realpasswd=<$pf>; }
                   1873: 			    chomp($realpasswd);
                   1874: 			    my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
                   1875: 			    if ($howpwd eq 'internal') {
                   1876: 				&Debug("internal auth");
                   1877: 				if (crypt($upass,$contentpwd) eq $contentpwd) {
                   1878: 				    my $salt=time;
                   1879: 				    $salt=substr($salt,6,2);
                   1880: 				    my $ncpass=crypt($npass,$salt);
                   1881: 				    {
                   1882: 					my $pf;
                   1883: 					if ($pf = IO::File->new(">$passfilename")) {
                   1884: 					    print $pf "internal:$ncpass\n";
                   1885: 					    &logthis("Result of password change for $uname: pwchange_success");
                   1886: 					    print $client "ok\n";
                   1887: 					} else {
                   1888: 					    &logthis("Unable to open $uname passwd to change password");
                   1889: 					    print $client "non_authorized\n";
                   1890: 					}
                   1891: 				    }             
                   1892: 				    
                   1893: 				} else {
                   1894: 				    print $client "non_authorized\n";
                   1895: 				}
                   1896: 			    } elsif ($howpwd eq 'unix') {
                   1897: 				# Unix means we have to access /etc/password
                   1898: 				# one way or another.
                   1899: 				# First: Make sure the current password is
                   1900: 				#        correct
                   1901: 				&Debug("auth is unix");
                   1902: 				$contentpwd=(getpwnam($uname))[1];
                   1903: 				my $pwdcorrect = "0";
                   1904: 				my $pwauth_path="/usr/local/sbin/pwauth";
                   1905: 				unless ($contentpwd eq 'x') {
                   1906: 				    $pwdcorrect=
                   1907: 					(crypt($upass,$contentpwd) eq $contentpwd);
                   1908: 				} elsif (-e $pwauth_path) {
                   1909: 				    open PWAUTH, "|$pwauth_path" or
                   1910: 					die "Cannot invoke authentication";
                   1911: 				    print PWAUTH "$uname\n$upass\n";
                   1912: 				    close PWAUTH;
                   1913: 				    &Debug("exited pwauth with $? ($uname,$upass) ");
                   1914: 				    $pwdcorrect=($? == 0);
                   1915: 				}
                   1916: 				if ($pwdcorrect) {
                   1917: 				    my $execdir=$perlvar{'lonDaemons'};
                   1918: 				    &Debug("Opening lcpasswd pipeline");
                   1919: 				    my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
                   1920: 				    print $pf "$uname\n$npass\n$npass\n";
                   1921: 				    close $pf;
                   1922: 				    my $err = $?;
                   1923: 				    my $result = ($err>0 ? 'pwchange_failure' 
                   1924: 						  : 'ok');
                   1925: 				    &logthis("Result of password change for $uname: ".
                   1926: 					     &lcpasswdstrerror($?));
                   1927: 				    print $client "$result\n";
                   1928: 				} else {
                   1929: 				    print $client "non_authorized\n";
                   1930: 				}
                   1931: 			    } else {
                   1932: 				print $client "auth_mode_error\n";
                   1933: 			    }  
                   1934: 			} else {
                   1935: 			    print $client "unknown_user\n";
                   1936: 			}
                   1937: 		    } else {
                   1938: 			Reply($client, "refused\n", $userinput);
                   1939: 		       
                   1940: 		    }
                   1941: # -------------------------------------------------------------------- makeuser
                   1942: 		} elsif ($userinput =~ /^makeuser/) { # encoded and client.
                   1943: 		    &Debug("Make user received");
                   1944: 		    my $oldumask=umask(0077);
                   1945: 		    if (($wasenc==1) && isClient) {
                   1946: 			my 
                   1947: 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
                   1948: 			&Debug("cmd =".$cmd." $udom =".$udom.
                   1949: 			       " uname=".$uname);
                   1950: 			chomp($npass);
                   1951: 			$npass=&unescape($npass);
                   1952: 			my $proname=propath($udom,$uname);
                   1953: 			my $passfilename="$proname/passwd";
                   1954: 			&Debug("Password file created will be:".
                   1955: 			       $passfilename);
                   1956: 			if (-e $passfilename) {
                   1957: 			    print $client "already_exists\n";
                   1958: 			} elsif ($udom ne $currentdomainid) {
                   1959: 			    print $client "not_right_domain\n";
                   1960: 			} else {
                   1961: 			    my @fpparts=split(/\//,$proname);
                   1962: 			    my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
                   1963: 			    my $fperror='';
                   1964: 			    for (my $i=3;$i<=$#fpparts;$i++) {
                   1965: 				$fpnow.='/'.$fpparts[$i]; 
                   1966: 				unless (-e $fpnow) {
                   1967: 				    unless (mkdir($fpnow,0777)) {
                   1968: 					$fperror="error: ".($!+0)
                   1969: 					    ." mkdir failed while attempting "
                   1970: 					    ."makeuser";
                   1971: 				    }
                   1972: 				}
                   1973: 			    }
                   1974: 			    unless ($fperror) {
                   1975: 				my $result=&make_passwd_file($uname, $umode,$npass,
                   1976: 							     $passfilename);
                   1977: 				print $client $result;
                   1978: 			    } else {
                   1979: 				print $client "$fperror\n";
                   1980: 			    }
                   1981: 			}
                   1982: 		    } else {
                   1983: 			Reply($client, "refused\n", $userinput);
                   1984: 	      
                   1985: 		    }
                   1986: 		    umask($oldumask);
                   1987: # -------------------------------------------------------------- changeuserauth
                   1988: 		} elsif ($userinput =~ /^changeuserauth/) { # encoded & client
                   1989: 		    &Debug("Changing authorization");
                   1990: 		    if (($wasenc==1) && isClient) {
                   1991: 			my 
                   1992: 			    ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
                   1993: 			chomp($npass);
                   1994: 			&Debug("cmd = ".$cmd." domain= ".$udom.
                   1995: 			       "uname =".$uname." umode= ".$umode);
                   1996: 			$npass=&unescape($npass);
                   1997: 			my $proname=&propath($udom,$uname);
                   1998: 			my $passfilename="$proname/passwd";
                   1999: 			if ($udom ne $currentdomainid) {
                   2000: 			    print $client "not_right_domain\n";
                   2001: 			} else {
                   2002: 			    my $result=&make_passwd_file($uname, $umode,$npass,
                   2003: 							 $passfilename);
                   2004: 			    print $client $result;
                   2005: 			}
                   2006: 		    } else {
                   2007: 			Reply($client, "refused\n", $userinput);
                   2008: 		   
                   2009: 		    }
                   2010: # ------------------------------------------------------------------------ home
                   2011: 		} elsif ($userinput =~ /^home/) { # client clear or encoded
                   2012: 		    if(isClient) {
                   2013: 			my ($cmd,$udom,$uname)=split(/:/,$userinput);
                   2014: 			chomp($uname);
                   2015: 			my $proname=propath($udom,$uname);
                   2016: 			if (-e $proname) {
                   2017: 			    print $client "found\n";
                   2018: 			} else {
                   2019: 			    print $client "not_found\n";
                   2020: 			}
                   2021: 		    } else {
                   2022: 			Reply($client, "refused\n", $userinput);
                   2023: 
                   2024: 		    }
                   2025: # ---------------------------------------------------------------------- update
                   2026: 		} elsif ($userinput =~ /^update/) { # client clear or encoded.
                   2027: 		    if(isClient) {
                   2028: 			my ($cmd,$fname)=split(/:/,$userinput);
                   2029: 			my $ownership=ishome($fname);
                   2030: 			if ($ownership eq 'not_owner') {
                   2031: 			    if (-e $fname) {
                   2032: 				my ($dev,$ino,$mode,$nlink,
                   2033: 				    $uid,$gid,$rdev,$size,
                   2034: 				    $atime,$mtime,$ctime,
                   2035: 				    $blksize,$blocks)=stat($fname);
                   2036: 				my $now=time;
                   2037: 				my $since=$now-$atime;
                   2038: 				if ($since>$perlvar{'lonExpire'}) {
                   2039: 				    my $reply=
                   2040: 					&reply("unsub:$fname","$clientname");
                   2041: 				    unlink("$fname");
                   2042: 				} else {
                   2043: 				    my $transname="$fname.in.transfer";
                   2044: 				    my $remoteurl=
                   2045: 					&reply("sub:$fname","$clientname");
                   2046: 				    my $response;
                   2047: 				    {
                   2048: 					my $ua=new LWP::UserAgent;
                   2049: 					my $request=new HTTP::Request('GET',"$remoteurl");
                   2050: 					$response=$ua->request($request,$transname);
                   2051: 				    }
                   2052: 				    if ($response->is_error()) {
                   2053: 					unlink($transname);
                   2054: 					my $message=$response->status_line;
                   2055: 					&logthis(
                   2056: 						 "LWP GET: $message for $fname ($remoteurl)");
                   2057: 				    } else {
                   2058: 					if ($remoteurl!~/\.meta$/) {
                   2059: 					    my $ua=new LWP::UserAgent;
                   2060: 					    my $mrequest=
                   2061: 						new HTTP::Request('GET',$remoteurl.'.meta');
                   2062: 					    my $mresponse=
                   2063: 						$ua->request($mrequest,$fname.'.meta');
                   2064: 					    if ($mresponse->is_error()) {
                   2065: 						unlink($fname.'.meta');
                   2066: 					    }
                   2067: 					}
                   2068: 					rename($transname,$fname);
                   2069: 				    }
                   2070: 				}
                   2071: 				print $client "ok\n";
                   2072: 			    } else {
                   2073: 				print $client "not_found\n";
                   2074: 			    }
                   2075: 			} else {
                   2076: 			    print $client "rejected\n";
                   2077: 			}
                   2078: 		    } else {
                   2079: 			Reply($client, "refused\n", $userinput);
                   2080: 
                   2081: 		    }
                   2082: # -------------------------------------- fetch a user file from a remote server
                   2083: 		} elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
                   2084: 		    if(isClient) {
1.184     raeburn  2085: 			my ($cmd,$fname)=split(/:/,$userinput);
1.185     albertel 2086: 			my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
1.178     foxr     2087: 			my $udir=propath($udom,$uname).'/userfiles';
                   2088: 			unless (-e $udir) { mkdir($udir,0770); }
                   2089: 			if (-e $udir) {
1.184     raeburn  2090:                             $ufile=~s/^[\.\~]+//;
                   2091:                             my $path = $udir;
1.185     albertel 2092:                             if ($ufile =~m|(.+)/([^/]+)$|) {
                   2093:                                 my @parts=split('/',$1);
1.184     raeburn  2094:                                 foreach my $part (@parts) {
                   2095:                                     $path .= '/'.$part;
                   2096:                                     if ((-e $path)!=1) {
                   2097:                                         mkdir($path,0770);
1.182     raeburn  2098:                                     }
                   2099:                                 }
                   2100:                             }
1.184     raeburn  2101: 			    my $destname=$udir.'/'.$ufile;
                   2102: 			    my $transname=$udir.'/'.$ufile.'.in.transit';
                   2103: 			    my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
1.178     foxr     2104: 			    my $response;
                   2105: 			    {
                   2106: 				my $ua=new LWP::UserAgent;
                   2107: 				my $request=new HTTP::Request('GET',"$remoteurl");
                   2108: 				$response=$ua->request($request,$transname);
                   2109: 			    }
                   2110: 			    if ($response->is_error()) {
                   2111: 				unlink($transname);
                   2112: 				my $message=$response->status_line;
1.184     raeburn  2113: 				&logthis("LWP GET: $message for $fname ($remoteurl)");
1.178     foxr     2114: 				print $client "failed\n";
                   2115: 			    } else {
                   2116: 				if (!rename($transname,$destname)) {
                   2117: 				    &logthis("Unable to move $transname to $destname");
                   2118: 				    unlink($transname);
                   2119: 				    print $client "failed\n";
                   2120: 				} else {
                   2121: 				    print $client "ok\n";
                   2122: 				}
                   2123: 			    }
                   2124: 			} else {
                   2125: 			    print $client "not_home\n";
1.187     albertel 2126: 			}
                   2127: 		    } else {
                   2128: 			Reply($client, "refused\n", $userinput);
                   2129: 		    }
                   2130: # --------------------------------------------------------- remove a user file 
                   2131: 		} elsif ($userinput =~ /^removeuserfile/) { # Client clear or enc.
                   2132: 		    if(isClient) {
                   2133: 			my ($cmd,$fname)=split(/:/,$userinput);
                   2134: 			my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
                   2135: 			&logthis("$udom - $uname - $ufile");
                   2136: 			if ($ufile =~m|/\.\./|) {
                   2137: 			    # any files paths with /../ in them refuse 
                   2138:                             # to deal with
                   2139: 			    print $client "refused\n";
                   2140: 			} else {
                   2141: 			    my $udir=propath($udom,$uname);
                   2142: 			    if (-e $udir) {
                   2143: 				my $file=$udir.'/userfiles/'.$ufile;
                   2144: 				if (-e $file) {
                   2145: 				    unlink($file);
                   2146: 				    if (-e $file) {
                   2147: 					print $client "failed\n";
                   2148: 				    } else {
                   2149: 					print $client "ok\n";
                   2150: 				    }
                   2151: 				} else {
                   2152: 				    print $client "not_found\n";
                   2153: 				}
                   2154: 			    } else {
                   2155: 				print $client "not_home\n";
                   2156: 			    }
1.178     foxr     2157: 			}
                   2158: 		    } else {
                   2159: 			Reply($client, "refused\n", $userinput);
                   2160: 		    }
                   2161: # ------------------------------------------ authenticate access to a user file
                   2162: 		} elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
                   2163: 		    if(isClient) {
                   2164: 			my ($cmd,$fname,$session)=split(/:/,$userinput);
                   2165: 			chomp($session);
                   2166: 			my $reply='non_auth';
                   2167: 			if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
                   2168: 				 $session.'.id')) {
                   2169: 			    while (my $line=<ENVIN>) {
1.185     albertel 2170: 				if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply='ok'; }
1.178     foxr     2171: 			    }
                   2172: 			    close(ENVIN);
                   2173: 			    print $client $reply."\n";
                   2174: 			} else {
                   2175: 			    print $client "invalid_token\n";
                   2176: 			}
                   2177: 		    } else {
                   2178: 			Reply($client, "refused\n", $userinput);
                   2179: 
                   2180: 		    }
                   2181: # ----------------------------------------------------------------- unsubscribe
                   2182: 		} elsif ($userinput =~ /^unsub/) {
                   2183: 		    if(isClient) {
                   2184: 			my ($cmd,$fname)=split(/:/,$userinput);
                   2185: 			if (-e $fname) {
1.188     foxr     2186: 			    print $client &unsub($fname,$clientip);
1.178     foxr     2187: 			} else {
                   2188: 			    print $client "not_found\n";
                   2189: 			}
                   2190: 		    } else {
                   2191: 			Reply($client, "refused\n", $userinput);
                   2192: 
                   2193: 		    }
                   2194: # ------------------------------------------------------------------- subscribe
                   2195: 		} elsif ($userinput =~ /^sub/) {
                   2196: 		    if(isClient) {
                   2197: 			print $client &subscribe($userinput,$clientip);
                   2198: 		    } else {
                   2199: 			Reply($client, "refused\n", $userinput);
                   2200: 
                   2201: 		    }
                   2202: # ------------------------------------------------------------- current version
                   2203: 		} elsif ($userinput =~ /^currentversion/) {
                   2204: 		    if(isClient) {
                   2205: 			my ($cmd,$fname)=split(/:/,$userinput);
                   2206: 			print $client &currentversion($fname)."\n";
                   2207: 		    } else {
                   2208: 			Reply($client, "refused\n", $userinput);
                   2209: 
                   2210: 		    }
                   2211: # ------------------------------------------------------------------------- log
                   2212: 		} elsif ($userinput =~ /^log/) {
                   2213: 		    if(isClient) {
                   2214: 			my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
                   2215: 			chomp($what);
                   2216: 			my $proname=propath($udom,$uname);
                   2217: 			my $now=time;
                   2218: 			{
                   2219: 			    my $hfh;
                   2220: 			    if ($hfh=IO::File->new(">>$proname/activity.log")) { 
                   2221: 				print $hfh "$now:$clientname:$what\n";
                   2222: 				print $client "ok\n"; 
                   2223: 			    } else {
                   2224: 				print $client "error: ".($!+0)
                   2225: 				    ." IO::File->new Failed "
                   2226: 				    ."while attempting log\n";
                   2227: 			    }
                   2228: 			}
                   2229: 		    } else {
                   2230: 			Reply($client, "refused\n", $userinput);
                   2231: 
                   2232: 		    }
                   2233: # ------------------------------------------------------------------------- put
                   2234: 		} elsif ($userinput =~ /^put/) {
                   2235: 		    if(isClient) {
                   2236: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2237: 			    =split(/:/,$userinput);
                   2238: 			$namespace=~s/\//\_/g;
                   2239: 			$namespace=~s/\W//g;
                   2240: 			if ($namespace ne 'roles') {
                   2241: 			    chomp($what);
                   2242: 			    my $proname=propath($udom,$uname);
                   2243: 			    my $now=time;
                   2244: 			    unless ($namespace=~/^nohist\_/) {
                   2245: 				my $hfh;
                   2246: 				if (
                   2247: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2248: 				    ) { print $hfh "P:$now:$what\n"; }
                   2249: 			    }
                   2250: 			    my @pairs=split(/\&/,$what);
                   2251: 			    my %hash;
                   2252: 			    if (tie(%hash,'GDBM_File',
                   2253: 				    "$proname/$namespace.db",
                   2254: 				    &GDBM_WRCREAT(),0640)) {
                   2255: 				foreach my $pair (@pairs) {
                   2256: 				    my ($key,$value)=split(/=/,$pair);
                   2257: 				    $hash{$key}=$value;
                   2258: 				}
                   2259: 				if (untie(%hash)) {
                   2260: 				    print $client "ok\n";
                   2261: 				} else {
                   2262: 				    print $client "error: ".($!+0)
                   2263: 					." untie(GDBM) failed ".
                   2264: 					"while attempting put\n";
                   2265: 				}
                   2266: 			    } else {
                   2267: 				print $client "error: ".($!)
                   2268: 				    ." tie(GDBM) Failed ".
                   2269: 				    "while attempting put\n";
                   2270: 			    }
                   2271: 			} else {
                   2272: 			    print $client "refused\n";
                   2273: 			}
                   2274: 		    } else {
                   2275: 			Reply($client, "refused\n", $userinput);
                   2276: 
                   2277: 		    }
                   2278: # ------------------------------------------------------------------- inc
                   2279: 		} elsif ($userinput =~ /^inc:/) {
                   2280: 		    if(isClient) {
                   2281: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2282: 			    =split(/:/,$userinput);
                   2283: 			$namespace=~s/\//\_/g;
                   2284: 			$namespace=~s/\W//g;
                   2285: 			if ($namespace ne 'roles') {
                   2286: 			    chomp($what);
                   2287: 			    my $proname=propath($udom,$uname);
                   2288: 			    my $now=time;
                   2289: 			    unless ($namespace=~/^nohist\_/) {
                   2290: 				my $hfh;
                   2291: 				if (
                   2292: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2293: 				    ) { print $hfh "P:$now:$what\n"; }
                   2294: 			    }
                   2295: 			    my @pairs=split(/\&/,$what);
                   2296: 			    my %hash;
                   2297: 			    if (tie(%hash,'GDBM_File',
                   2298: 				    "$proname/$namespace.db",
                   2299: 				    &GDBM_WRCREAT(),0640)) {
                   2300: 				foreach my $pair (@pairs) {
                   2301: 				    my ($key,$value)=split(/=/,$pair);
                   2302:                                     # We could check that we have a number...
                   2303:                                     if (! defined($value) || $value eq '') {
                   2304:                                         $value = 1;
                   2305:                                     }
                   2306: 				    $hash{$key}+=$value;
                   2307: 				}
                   2308: 				if (untie(%hash)) {
                   2309: 				    print $client "ok\n";
                   2310: 				} else {
                   2311: 				    print $client "error: ".($!+0)
                   2312: 					." untie(GDBM) failed ".
1.181     albertel 2313: 					"while attempting inc\n";
1.178     foxr     2314: 				}
                   2315: 			    } else {
                   2316: 				print $client "error: ".($!)
                   2317: 				    ." tie(GDBM) Failed ".
1.181     albertel 2318: 				    "while attempting inc\n";
1.178     foxr     2319: 			    }
                   2320: 			} else {
                   2321: 			    print $client "refused\n";
                   2322: 			}
                   2323: 		    } else {
                   2324: 			Reply($client, "refused\n", $userinput);
                   2325: 
                   2326: 		    }
                   2327: # -------------------------------------------------------------------- rolesput
                   2328: 		} elsif ($userinput =~ /^rolesput/) {
                   2329: 		    if(isClient) {
                   2330: 			&Debug("rolesput");
                   2331: 			if ($wasenc==1) {
                   2332: 			    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
                   2333: 				=split(/:/,$userinput);
                   2334: 			    &Debug("cmd = ".$cmd." exedom= ".$exedom.
                   2335: 				   "user = ".$exeuser." udom=".$udom.
                   2336: 				   "what = ".$what);
                   2337: 			    my $namespace='roles';
                   2338: 			    chomp($what);
                   2339: 			    my $proname=propath($udom,$uname);
                   2340: 			    my $now=time;
                   2341: 			    {
                   2342: 				my $hfh;
                   2343: 				if (
                   2344: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2345: 				    ) { 
                   2346: 				    print $hfh "P:$now:$exedom:$exeuser:$what\n";
                   2347: 				}
                   2348: 			    }
                   2349: 			    my @pairs=split(/\&/,$what);
                   2350: 			    my %hash;
                   2351: 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2352: 				foreach my $pair (@pairs) {
                   2353: 				    my ($key,$value)=split(/=/,$pair);
                   2354: 				    &ManagePermissions($key, $udom, $uname,
                   2355: 						       &GetAuthType( $udom, 
                   2356: 								     $uname));
                   2357: 				    $hash{$key}=$value;
                   2358: 				}
                   2359: 				if (untie(%hash)) {
                   2360: 				    print $client "ok\n";
                   2361: 				} else {
                   2362: 				    print $client "error: ".($!+0)
                   2363: 					." untie(GDBM) Failed ".
                   2364: 					"while attempting rolesput\n";
                   2365: 				}
                   2366: 			    } else {
                   2367: 				print $client "error: ".($!+0)
                   2368: 				    ." tie(GDBM) Failed ".
                   2369: 				    "while attempting rolesput\n";
                   2370: 			    }
                   2371: 			} else {
                   2372: 			    print $client "refused\n";
                   2373: 			}
                   2374: 		    } else {
                   2375: 			Reply($client, "refused\n", $userinput);
                   2376: 		  
                   2377: 		    }
                   2378: # -------------------------------------------------------------------- rolesdel
                   2379: 		} elsif ($userinput =~ /^rolesdel/) {
                   2380: 		    if(isClient) {
                   2381: 			&Debug("rolesdel");
                   2382: 			if ($wasenc==1) {
                   2383: 			    my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
                   2384: 				=split(/:/,$userinput);
                   2385: 			    &Debug("cmd = ".$cmd." exedom= ".$exedom.
                   2386: 				   "user = ".$exeuser." udom=".$udom.
                   2387: 				   "what = ".$what);
                   2388: 			    my $namespace='roles';
                   2389: 			    chomp($what);
                   2390: 			    my $proname=propath($udom,$uname);
                   2391: 			    my $now=time;
                   2392: 			    {
                   2393: 				my $hfh;
                   2394: 				if (
                   2395: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2396: 				    ) { 
                   2397: 				    print $hfh "D:$now:$exedom:$exeuser:$what\n";
                   2398: 				}
                   2399: 			    }
                   2400: 			    my @rolekeys=split(/\&/,$what);
                   2401: 			    my %hash;
                   2402: 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2403: 				foreach my $key (@rolekeys) {
                   2404: 				    delete $hash{$key};
                   2405: 				}
                   2406: 				if (untie(%hash)) {
                   2407: 				    print $client "ok\n";
                   2408: 				} else {
                   2409: 				    print $client "error: ".($!+0)
                   2410: 					." untie(GDBM) Failed ".
                   2411: 					"while attempting rolesdel\n";
                   2412: 				}
                   2413: 			    } else {
                   2414: 				print $client "error: ".($!+0)
                   2415: 				    ." tie(GDBM) Failed ".
                   2416: 				    "while attempting rolesdel\n";
                   2417: 			    }
                   2418: 			} else {
                   2419: 			    print $client "refused\n";
                   2420: 			}
                   2421: 		    } else {
                   2422: 			Reply($client, "refused\n", $userinput);
                   2423: 		      
                   2424: 		    }
                   2425: # ------------------------------------------------------------------------- get
                   2426: 		} elsif ($userinput =~ /^get/) {
                   2427: 		    if(isClient) {
                   2428: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2429: 			    =split(/:/,$userinput);
                   2430: 			$namespace=~s/\//\_/g;
                   2431: 			$namespace=~s/\W//g;
                   2432: 			chomp($what);
                   2433: 			my @queries=split(/\&/,$what);
                   2434: 			my $proname=propath($udom,$uname);
                   2435: 			my $qresult='';
                   2436: 			my %hash;
                   2437: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2438: 			    for (my $i=0;$i<=$#queries;$i++) {
                   2439: 				$qresult.="$hash{$queries[$i]}&";
                   2440: 			    }
                   2441: 			    if (untie(%hash)) {
                   2442: 				$qresult=~s/\&$//;
                   2443: 				print $client "$qresult\n";
                   2444: 			    } else {
                   2445: 				print $client "error: ".($!+0)
                   2446: 				    ." untie(GDBM) Failed ".
                   2447: 				    "while attempting get\n";
                   2448: 			    }
                   2449: 			} else {
                   2450: 			    if ($!+0 == 2) {
                   2451: 				print $client "error:No such file or ".
                   2452: 				    "GDBM reported bad block error\n";
                   2453: 			    } else {
                   2454: 				print $client "error: ".($!+0)
                   2455: 				    ." tie(GDBM) Failed ".
                   2456: 				    "while attempting get\n";
                   2457: 			    }
                   2458: 			}
                   2459: 		    } else {
                   2460: 			Reply($client, "refused\n", $userinput);
                   2461: 		       
                   2462: 		    }
                   2463: # ------------------------------------------------------------------------ eget
                   2464: 		} elsif ($userinput =~ /^eget/) {
                   2465: 		    if (isClient) {
                   2466: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2467: 			    =split(/:/,$userinput);
                   2468: 			$namespace=~s/\//\_/g;
                   2469: 			$namespace=~s/\W//g;
                   2470: 			chomp($what);
                   2471: 			my @queries=split(/\&/,$what);
                   2472: 			my $proname=propath($udom,$uname);
                   2473: 			my $qresult='';
                   2474: 			my %hash;
                   2475: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2476: 			    for (my $i=0;$i<=$#queries;$i++) {
                   2477: 				$qresult.="$hash{$queries[$i]}&";
                   2478: 			    }
                   2479: 			    if (untie(%hash)) {
                   2480: 				$qresult=~s/\&$//;
                   2481: 				if ($cipher) {
                   2482: 				    my $cmdlength=length($qresult);
                   2483: 				    $qresult.="         ";
                   2484: 				    my $encqresult='';
                   2485: 				    for 
                   2486: 					(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
                   2487: 					    $encqresult.=
                   2488: 						unpack("H16",
                   2489: 						       $cipher->encrypt(substr($qresult,$encidx,8)));
                   2490: 					}
                   2491: 				    print $client "enc:$cmdlength:$encqresult\n";
                   2492: 				} else {
                   2493: 				    print $client "error:no_key\n";
                   2494: 				}
                   2495: 			    } else {
                   2496: 				print $client "error: ".($!+0)
                   2497: 				    ." untie(GDBM) Failed ".
                   2498: 				    "while attempting eget\n";
                   2499: 			    }
                   2500: 			} else {
                   2501: 			    print $client "error: ".($!+0)
                   2502: 				." tie(GDBM) Failed ".
                   2503: 				"while attempting eget\n";
                   2504: 			}
                   2505: 		    } else {
                   2506: 			Reply($client, "refused\n", $userinput);
                   2507: 		    
                   2508: 		    }
                   2509: # ------------------------------------------------------------------------- del
                   2510: 		} elsif ($userinput =~ /^del/) {
                   2511: 		    if(isClient) {
                   2512: 			my ($cmd,$udom,$uname,$namespace,$what)
                   2513: 			    =split(/:/,$userinput);
                   2514: 			$namespace=~s/\//\_/g;
                   2515: 			$namespace=~s/\W//g;
                   2516: 			chomp($what);
                   2517: 			my $proname=propath($udom,$uname);
                   2518: 			my $now=time;
                   2519: 			unless ($namespace=~/^nohist\_/) {
                   2520: 			    my $hfh;
                   2521: 			    if (
                   2522: 				$hfh=IO::File->new(">>$proname/$namespace.hist")
                   2523: 				) { print $hfh "D:$now:$what\n"; }
                   2524: 			}
                   2525: 			my @keys=split(/\&/,$what);
                   2526: 			my %hash;
                   2527: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2528: 			    foreach my $key (@keys) {
                   2529: 				delete($hash{$key});
                   2530: 			    }
                   2531: 			    if (untie(%hash)) {
                   2532: 				print $client "ok\n";
                   2533: 			    } else {
                   2534: 				print $client "error: ".($!+0)
                   2535: 				    ." untie(GDBM) Failed ".
                   2536: 				    "while attempting del\n";
                   2537: 			    }
                   2538: 			} else {
                   2539: 			    print $client "error: ".($!+0)
                   2540: 				." tie(GDBM) Failed ".
                   2541: 				"while attempting del\n";
                   2542: 			}
                   2543: 		    } else {
                   2544: 			Reply($client, "refused\n", $userinput);
                   2545: 			
                   2546: 		    }
                   2547: # ------------------------------------------------------------------------ keys
                   2548: 		} elsif ($userinput =~ /^keys/) {
                   2549: 		    if(isClient) {
                   2550: 			my ($cmd,$udom,$uname,$namespace)
                   2551: 			    =split(/:/,$userinput);
                   2552: 			$namespace=~s/\//\_/g;
                   2553: 			$namespace=~s/\W//g;
                   2554: 			my $proname=propath($udom,$uname);
                   2555: 			my $qresult='';
                   2556: 			my %hash;
                   2557: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2558: 			    foreach my $key (keys %hash) {
                   2559: 				$qresult.="$key&";
                   2560: 			    }
                   2561: 			    if (untie(%hash)) {
                   2562: 				$qresult=~s/\&$//;
                   2563: 				print $client "$qresult\n";
                   2564: 			    } else {
                   2565: 				print $client "error: ".($!+0)
                   2566: 				    ." untie(GDBM) Failed ".
                   2567: 				    "while attempting keys\n";
                   2568: 			    }
                   2569: 			} else {
                   2570: 			    print $client "error: ".($!+0)
                   2571: 				." tie(GDBM) Failed ".
                   2572: 				"while attempting keys\n";
                   2573: 			}
                   2574: 		    } else {
                   2575: 			Reply($client, "refused\n", $userinput);
                   2576: 		   
                   2577: 		    }
                   2578: # ----------------------------------------------------------------- dumpcurrent
                   2579: 		} elsif ($userinput =~ /^currentdump/) {
                   2580: 		    if (isClient) {
                   2581: 			my ($cmd,$udom,$uname,$namespace)
                   2582: 			    =split(/:/,$userinput);
                   2583: 			$namespace=~s/\//\_/g;
                   2584: 			$namespace=~s/\W//g;
                   2585: 			my $qresult='';
                   2586: 			my $proname=propath($udom,$uname);
                   2587: 			my %hash;
                   2588: 			if (tie(%hash,'GDBM_File',
                   2589: 				"$proname/$namespace.db",
                   2590: 				&GDBM_READER(),0640)) {
                   2591: 			    # Structure of %data:
                   2592: 			    # $data{$symb}->{$parameter}=$value;
                   2593: 			    # $data{$symb}->{'v.'.$parameter}=$version;
                   2594: 			    # since $parameter will be unescaped, we do not
                   2595: 			    # have to worry about silly parameter names...
                   2596: 			    my %data = ();
                   2597: 			    while (my ($key,$value) = each(%hash)) {
                   2598: 				my ($v,$symb,$param) = split(/:/,$key);
                   2599: 				next if ($v eq 'version' || $symb eq 'keys');
                   2600: 				next if (exists($data{$symb}) && 
                   2601: 					 exists($data{$symb}->{$param}) &&
                   2602: 					 $data{$symb}->{'v.'.$param} > $v);
                   2603: 				$data{$symb}->{$param}=$value;
                   2604: 				$data{$symb}->{'v.'.$param}=$v;
                   2605: 			    }
                   2606: 			    if (untie(%hash)) {
                   2607: 				while (my ($symb,$param_hash) = each(%data)) {
                   2608: 				    while(my ($param,$value) = each (%$param_hash)){
                   2609: 					next if ($param =~ /^v\./);
                   2610: 					$qresult.=$symb.':'.$param.'='.$value.'&';
                   2611: 				    }
                   2612: 				}
                   2613: 				chop($qresult);
                   2614: 				print $client "$qresult\n";
                   2615: 			    } else {
                   2616: 				print $client "error: ".($!+0)
                   2617: 				    ." untie(GDBM) Failed ".
                   2618: 				    "while attempting currentdump\n";
                   2619: 			    }
                   2620: 			} else {
                   2621: 			    print $client "error: ".($!+0)
                   2622: 				." tie(GDBM) Failed ".
                   2623: 				"while attempting currentdump\n";
                   2624: 			}
                   2625: 		    } else {
                   2626: 			Reply($client, "refused\n", $userinput);
                   2627: 		    }
                   2628: # ------------------------------------------------------------------------ dump
                   2629: 		} elsif ($userinput =~ /^dump/) {
                   2630: 		    if(isClient) {
                   2631: 			my ($cmd,$udom,$uname,$namespace,$regexp)
                   2632: 			    =split(/:/,$userinput);
                   2633: 			$namespace=~s/\//\_/g;
                   2634: 			$namespace=~s/\W//g;
                   2635: 			if (defined($regexp)) {
                   2636: 			    $regexp=&unescape($regexp);
                   2637: 			} else {
                   2638: 			    $regexp='.';
                   2639: 			}
                   2640: 			my $qresult='';
                   2641: 			my $proname=propath($udom,$uname);
                   2642: 			my %hash;
                   2643: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2644: 			       while (my ($key,$value) = each(%hash)) {
                   2645: 				   if ($regexp eq '.') {
                   2646: 				       $qresult.=$key.'='.$value.'&';
                   2647: 				   } else {
                   2648: 				       my $unescapeKey = &unescape($key);
                   2649: 				       if (eval('$unescapeKey=~/$regexp/')) {
                   2650: 					   $qresult.="$key=$value&";
                   2651: 				       }
                   2652: 				   }
                   2653: 			       }
                   2654: 			       if (untie(%hash)) {
                   2655: 				   chop($qresult);
                   2656: 				   print $client "$qresult\n";
                   2657: 			       } else {
                   2658: 				   print $client "error: ".($!+0)
                   2659: 				       ." untie(GDBM) Failed ".
                   2660:                                        "while attempting dump\n";
                   2661: 			       }
                   2662: 			   } else {
                   2663: 			       print $client "error: ".($!+0)
                   2664: 				   ." tie(GDBM) Failed ".
                   2665: 				   "while attempting dump\n";
                   2666: 			   }
                   2667: 		    } else {
                   2668: 			Reply($client, "refused\n", $userinput);
                   2669: 		 
                   2670: 		    }
                   2671: # ----------------------------------------------------------------------- store
                   2672: 		} elsif ($userinput =~ /^store/) {
                   2673: 		    if(isClient) {
                   2674: 			my ($cmd,$udom,$uname,$namespace,$rid,$what)
                   2675: 			    =split(/:/,$userinput);
                   2676: 			$namespace=~s/\//\_/g;
                   2677: 			$namespace=~s/\W//g;
                   2678: 			if ($namespace ne 'roles') {
                   2679: 			    chomp($what);
                   2680: 			    my $proname=propath($udom,$uname);
                   2681: 			    my $now=time;
                   2682: 			    unless ($namespace=~/^nohist\_/) {
                   2683: 				my $hfh;
                   2684: 				if (
                   2685: 				    $hfh=IO::File->new(">>$proname/$namespace.hist")
                   2686: 				    ) { print $hfh "P:$now:$rid:$what\n"; }
                   2687: 			    }
                   2688: 			    my @pairs=split(/\&/,$what);
                   2689: 			    my %hash;
                   2690: 			    if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
                   2691: 				my @previouskeys=split(/&/,$hash{"keys:$rid"});
                   2692: 				my $key;
                   2693: 				$hash{"version:$rid"}++;
                   2694: 				my $version=$hash{"version:$rid"};
                   2695: 				my $allkeys=''; 
                   2696: 				foreach my $pair (@pairs) {
                   2697: 				    my ($key,$value)=split(/=/,$pair);
                   2698: 				    $allkeys.=$key.':';
                   2699: 				    $hash{"$version:$rid:$key"}=$value;
                   2700: 				}
                   2701: 				$hash{"$version:$rid:timestamp"}=$now;
                   2702: 				$allkeys.='timestamp';
                   2703: 				$hash{"$version:keys:$rid"}=$allkeys;
                   2704: 				if (untie(%hash)) {
                   2705: 				    print $client "ok\n";
                   2706: 				} else {
                   2707: 				    print $client "error: ".($!+0)
                   2708: 					." untie(GDBM) Failed ".
                   2709: 					"while attempting store\n";
                   2710: 				}
                   2711: 			    } else {
                   2712: 				print $client "error: ".($!+0)
                   2713: 				    ." tie(GDBM) Failed ".
                   2714: 				    "while attempting store\n";
                   2715: 			    }
                   2716: 			} else {
                   2717: 			    print $client "refused\n";
                   2718: 			}
                   2719: 		    } else {
                   2720: 			Reply($client, "refused\n", $userinput);
                   2721: 		     
                   2722: 		    }
                   2723: # --------------------------------------------------------------------- restore
                   2724: 		} elsif ($userinput =~ /^restore/) {
                   2725: 		    if(isClient) {
                   2726: 			my ($cmd,$udom,$uname,$namespace,$rid)
                   2727: 			    =split(/:/,$userinput);
                   2728: 			$namespace=~s/\//\_/g;
                   2729: 			$namespace=~s/\W//g;
                   2730: 			chomp($rid);
                   2731: 			my $proname=propath($udom,$uname);
                   2732: 			my $qresult='';
                   2733: 			my %hash;
                   2734: 			if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
                   2735: 			    my $version=$hash{"version:$rid"};
                   2736: 			    $qresult.="version=$version&";
                   2737: 			    my $scope;
                   2738: 			    for ($scope=1;$scope<=$version;$scope++) {
                   2739: 				my $vkeys=$hash{"$scope:keys:$rid"};
                   2740: 				my @keys=split(/:/,$vkeys);
                   2741: 				my $key;
                   2742: 				$qresult.="$scope:keys=$vkeys&";
                   2743: 				foreach $key (@keys) {
                   2744: 				    $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
                   2745: 				}                                  
                   2746: 			    }
                   2747: 			    if (untie(%hash)) {
                   2748: 				$qresult=~s/\&$//;
                   2749: 				print $client "$qresult\n";
                   2750: 			    } else {
                   2751: 				print $client "error: ".($!+0)
                   2752: 				    ." untie(GDBM) Failed ".
                   2753: 				    "while attempting restore\n";
                   2754: 			    }
                   2755: 			} else {
                   2756: 			    print $client "error: ".($!+0)
                   2757: 				." tie(GDBM) Failed ".
                   2758: 				"while attempting restore\n";
                   2759: 			}
                   2760: 		    } else  {
                   2761: 			Reply($client, "refused\n", $userinput);
                   2762: 		       
                   2763: 		    }
                   2764: # -------------------------------------------------------------------- chatsend
                   2765: 		} elsif ($userinput =~ /^chatsend/) {
                   2766: 		    if(isClient) {
                   2767: 			my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
                   2768: 			&chatadd($cdom,$cnum,$newpost);
                   2769: 			print $client "ok\n";
                   2770: 		    } else {
                   2771: 			Reply($client, "refused\n", $userinput);
                   2772: 		      
                   2773: 		    }
                   2774: # -------------------------------------------------------------------- chatretr
                   2775: 		} elsif ($userinput =~ /^chatretr/) {
                   2776: 		    if(isClient) {
                   2777: 			my 
                   2778: 			    ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
                   2779: 			my $reply='';
                   2780: 			foreach (&getchat($cdom,$cnum,$udom,$uname)) {
                   2781: 			    $reply.=&escape($_).':';
                   2782: 			}
                   2783: 			$reply=~s/\:$//;
                   2784: 			print $client $reply."\n";
                   2785: 		    } else {
                   2786: 			Reply($client, "refused\n", $userinput);
                   2787: 		       
                   2788: 		    }
                   2789: # ------------------------------------------------------------------- querysend
                   2790: 		} elsif ($userinput =~ /^querysend/) {
1.193     raeburn  2791: 		    if (isClient) {
1.178     foxr     2792: 			my ($cmd,$query,
                   2793: 			    $arg1,$arg2,$arg3)=split(/\:/,$userinput);
                   2794: 			$query=~s/\n*$//g;
                   2795: 			print $client "".
                   2796: 			    sqlreply("$clientname\&$query".
                   2797: 				     "\&$arg1"."\&$arg2"."\&$arg3")."\n";
                   2798: 		    } else {
                   2799: 			Reply($client, "refused\n", $userinput);
                   2800: 		      
                   2801: 		    }
                   2802: # ------------------------------------------------------------------ queryreply
                   2803: 		} elsif ($userinput =~ /^queryreply/) {
                   2804: 		    if(isClient) {
                   2805: 			my ($cmd,$id,$reply)=split(/:/,$userinput); 
                   2806: 			my $store;
                   2807: 			my $execdir=$perlvar{'lonDaemons'};
                   2808: 			if ($store=IO::File->new(">$execdir/tmp/$id")) {
                   2809: 			    $reply=~s/\&/\n/g;
                   2810: 			    print $store $reply;
                   2811: 			    close $store;
                   2812: 			    my $store2=IO::File->new(">$execdir/tmp/$id.end");
                   2813: 			    print $store2 "done\n";
                   2814: 			    close $store2;
                   2815: 			    print $client "ok\n";
                   2816: 			}
                   2817: 			else {
                   2818: 			    print $client "error: ".($!+0)
                   2819: 				." IO::File->new Failed ".
                   2820: 				"while attempting queryreply\n";
                   2821: 			}
                   2822: 		    } else {
                   2823: 			Reply($client, "refused\n", $userinput);
                   2824: 		     
                   2825: 		    }
                   2826: # ----------------------------------------------------------------- courseidput
                   2827: 		} elsif ($userinput =~ /^courseidput/) {
                   2828: 		    if(isClient) {
                   2829: 			my ($cmd,$udom,$what)=split(/:/,$userinput);
                   2830: 			chomp($what);
                   2831: 			$udom=~s/\W//g;
                   2832: 			my $proname=
                   2833: 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
                   2834: 			my $now=time;
                   2835: 			my @pairs=split(/\&/,$what);
                   2836: 			my %hash;
                   2837: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
                   2838: 			    foreach my $pair (@pairs) {
1.202   ! raeburn  2839: 				my ($key,$descr,$inst_code)=split(/=/,$pair);
        !          2840: 				$hash{$key}=$descr.':'.$inst_code.':'.$now;
1.178     foxr     2841: 			    }
                   2842: 			    if (untie(%hash)) {
                   2843: 				print $client "ok\n";
                   2844: 			    } else {
                   2845: 				print $client "error: ".($!+0)
                   2846: 				    ." untie(GDBM) Failed ".
                   2847: 				    "while attempting courseidput\n";
                   2848: 			    }
                   2849: 			} else {
                   2850: 			    print $client "error: ".($!+0)
                   2851: 				." tie(GDBM) Failed ".
                   2852: 				"while attempting courseidput\n";
                   2853: 			}
                   2854: 		    } else {
                   2855: 			Reply($client, "refused\n", $userinput);
                   2856: 		       
                   2857: 		    }
                   2858: # ---------------------------------------------------------------- courseiddump
                   2859: 		} elsif ($userinput =~ /^courseiddump/) {
                   2860: 		    if(isClient) {
                   2861: 			my ($cmd,$udom,$since,$description)
                   2862: 			    =split(/:/,$userinput);
                   2863: 			if (defined($description)) {
                   2864: 			    $description=&unescape($description);
                   2865: 			} else {
                   2866: 			    $description='.';
                   2867: 			}
                   2868: 			unless (defined($since)) { $since=0; }
                   2869: 			my $qresult='';
                   2870: 			my $proname=
                   2871: 			    "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
                   2872: 			my %hash;
                   2873: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
                   2874: 			    while (my ($key,$value) = each(%hash)) {
1.202   ! raeburn  2875:                                 my ($descr,$lasttime,$inst_code);
        !          2876:                                 if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
        !          2877: 				    ($descr,$inst_code,$lasttime)=($1,$2,$3);
        !          2878:                                 } else {
        !          2879:                                     ($descr,$lasttime) = split(/\:/,$value);
        !          2880:                                 }
1.178     foxr     2881: 				if ($lasttime<$since) { next; }
                   2882: 				if ($description eq '.') {
1.202   ! raeburn  2883: 				    $qresult.=$key.'='.$descr.':'.$inst_code.'&';
1.178     foxr     2884: 				} else {
                   2885: 				    my $unescapeVal = &unescape($descr);
1.189     www      2886: 				    if (eval('$unescapeVal=~/\Q$description\E/i')) {
1.202   ! raeburn  2887: 					$qresult.=$key.'='.$descr.':'.$inst_code.'&';
1.178     foxr     2888: 				    }
                   2889: 				}
                   2890: 			    }
                   2891: 			    if (untie(%hash)) {
                   2892: 				chop($qresult);
                   2893: 				print $client "$qresult\n";
                   2894: 			    } else {
                   2895: 				print $client "error: ".($!+0)
                   2896: 				    ." untie(GDBM) Failed ".
                   2897: 				    "while attempting courseiddump\n";
                   2898: 			    }
                   2899: 			} else {
                   2900: 			    print $client "error: ".($!+0)
                   2901: 				." tie(GDBM) Failed ".
                   2902: 				"while attempting courseiddump\n";
                   2903: 			}
                   2904: 		    } else {
                   2905: 			Reply($client, "refused\n", $userinput);
                   2906: 		       
                   2907: 		    }
                   2908: # ----------------------------------------------------------------------- idput
                   2909: 		} elsif ($userinput =~ /^idput/) {
                   2910: 		    if(isClient) {
                   2911: 			my ($cmd,$udom,$what)=split(/:/,$userinput);
                   2912: 			chomp($what);
                   2913: 			$udom=~s/\W//g;
                   2914: 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
                   2915: 			my $now=time;
                   2916: 			{
                   2917: 			    my $hfh;
                   2918: 			    if (
                   2919: 				$hfh=IO::File->new(">>$proname.hist")
                   2920: 				) { print $hfh "P:$now:$what\n"; }
                   2921: 			}
                   2922: 			my @pairs=split(/\&/,$what);
                   2923: 			my %hash;
                   2924: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
                   2925: 			    foreach my $pair (@pairs) {
                   2926: 				my ($key,$value)=split(/=/,$pair);
                   2927: 				$hash{$key}=$value;
                   2928: 			    }
                   2929: 			    if (untie(%hash)) {
                   2930: 				print $client "ok\n";
                   2931: 			    } else {
                   2932: 				print $client "error: ".($!+0)
                   2933: 				    ." untie(GDBM) Failed ".
                   2934: 				    "while attempting idput\n";
                   2935: 			    }
                   2936: 			} else {
                   2937: 			    print $client "error: ".($!+0)
                   2938: 				." tie(GDBM) Failed ".
                   2939: 				"while attempting idput\n";
                   2940: 			}
                   2941: 		    } else {
                   2942: 			Reply($client, "refused\n", $userinput);
                   2943: 		       
                   2944: 		    }
                   2945: # ----------------------------------------------------------------------- idget
                   2946: 		} elsif ($userinput =~ /^idget/) {
                   2947: 		    if(isClient) {
                   2948: 			my ($cmd,$udom,$what)=split(/:/,$userinput);
                   2949: 			chomp($what);
                   2950: 			$udom=~s/\W//g;
                   2951: 			my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
                   2952: 			my @queries=split(/\&/,$what);
                   2953: 			my $qresult='';
                   2954: 			my %hash;
                   2955: 			if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
                   2956: 			    for (my $i=0;$i<=$#queries;$i++) {
                   2957: 				$qresult.="$hash{$queries[$i]}&";
                   2958: 			    }
                   2959: 			    if (untie(%hash)) {
                   2960: 				$qresult=~s/\&$//;
                   2961: 				print $client "$qresult\n";
                   2962: 			    } else {
                   2963: 				print $client "error: ".($!+0)
                   2964: 				    ." untie(GDBM) Failed ".
                   2965: 				    "while attempting idget\n";
                   2966: 			    }
                   2967: 			} else {
                   2968: 			    print $client "error: ".($!+0)
                   2969: 				." tie(GDBM) Failed ".
                   2970: 				"while attempting idget\n";
                   2971: 			}
                   2972: 		    } else {
                   2973: 			Reply($client, "refused\n", $userinput);
                   2974: 		       
                   2975: 		    }
                   2976: # ---------------------------------------------------------------------- tmpput
                   2977: 		} elsif ($userinput =~ /^tmpput/) {
                   2978: 		    if(isClient) {
                   2979: 			my ($cmd,$what)=split(/:/,$userinput);
                   2980: 			my $store;
                   2981: 			$tmpsnum++;
                   2982: 			my $id=$$.'_'.$clientip.'_'.$tmpsnum;
                   2983: 			$id=~s/\W/\_/g;
                   2984: 			$what=~s/\n//g;
                   2985: 			my $execdir=$perlvar{'lonDaemons'};
                   2986: 			if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
                   2987: 			    print $store $what;
                   2988: 			    close $store;
                   2989: 			    print $client "$id\n";
                   2990: 			}
                   2991: 			else {
                   2992: 			    print $client "error: ".($!+0)
                   2993: 				."IO::File->new Failed ".
                   2994: 				"while attempting tmpput\n";
                   2995: 			}
                   2996: 		    } else {
                   2997: 			Reply($client, "refused\n", $userinput);
                   2998: 		    
                   2999: 		    }
                   3000: 		    
                   3001: # ---------------------------------------------------------------------- tmpget
                   3002: 		} elsif ($userinput =~ /^tmpget/) {
                   3003: 		    if(isClient) {
                   3004: 			my ($cmd,$id)=split(/:/,$userinput);
                   3005: 			chomp($id);
                   3006: 			$id=~s/\W/\_/g;
                   3007: 			my $store;
                   3008: 			my $execdir=$perlvar{'lonDaemons'};
                   3009: 			if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
                   3010: 			    my $reply=<$store>;
                   3011: 			    print $client "$reply\n";
                   3012: 			    close $store;
                   3013: 			}
                   3014: 			else {
                   3015: 			    print $client "error: ".($!+0)
                   3016: 				."IO::File->new Failed ".
                   3017: 				"while attempting tmpget\n";
                   3018: 			}
                   3019: 		    } else {
                   3020: 			Reply($client, "refused\n", $userinput);
                   3021: 		      
                   3022: 		    }
                   3023: # ---------------------------------------------------------------------- tmpdel
                   3024: 		} elsif ($userinput =~ /^tmpdel/) {
                   3025: 		    if(isClient) {
                   3026: 			my ($cmd,$id)=split(/:/,$userinput);
                   3027: 			chomp($id);
                   3028: 			$id=~s/\W/\_/g;
                   3029: 			my $execdir=$perlvar{'lonDaemons'};
                   3030: 			if (unlink("$execdir/tmp/$id.tmp")) {
                   3031: 			    print $client "ok\n";
                   3032: 			} else {
                   3033: 			    print $client "error: ".($!+0)
                   3034: 				."Unlink tmp Failed ".
                   3035: 				"while attempting tmpdel\n";
                   3036: 			}
                   3037: 		    } else {
                   3038: 			Reply($client, "refused\n", $userinput);
                   3039: 		     
                   3040: 		    }
1.201     matthew  3041: # ----------------------------------------- portfolio directory list (portls)
                   3042:                 } elsif ($userinput =~ /^portls/) {
                   3043:                     if(isClient) {
                   3044:                         my ($cmd,$uname,$udom)=split(/:/,$userinput);
                   3045:                         my $udir=propath($udom,$uname).'/userfiles/portfolio';
                   3046:                         my $dirLine='';
                   3047:                         my $dirContents='';
                   3048:                         if (opendir(LSDIR,$udir.'/')){
                   3049:                             while ($dirLine = readdir(LSDIR)){
                   3050:                                 $dirContents = $dirContents.$dirLine.'<br />';
                   3051:                             }
                   3052:                         } else {
                   3053:                             $dirContents = "No directory found\n";
                   3054:                         }
                   3055:                         print $client $dirContents."\n";
                   3056:                     } else {
                   3057:                         Reply($client, "refused\n", $userinput);
                   3058:                     }
1.178     foxr     3059: # -------------------------------------------------------------------------- ls
                   3060: 		} elsif ($userinput =~ /^ls/) {
                   3061: 		    if(isClient) {
                   3062: 			my $obs;
                   3063: 			my $rights;
                   3064: 			my ($cmd,$ulsdir)=split(/:/,$userinput);
                   3065: 			my $ulsout='';
                   3066: 			my $ulsfn;
                   3067: 			if (-e $ulsdir) {
                   3068: 			    if(-d $ulsdir) {
                   3069: 				if (opendir(LSDIR,$ulsdir)) {
                   3070: 				    while ($ulsfn=readdir(LSDIR)) {
                   3071: 					undef $obs, $rights; 
                   3072: 					my @ulsstats=stat($ulsdir.'/'.$ulsfn);
                   3073: 					#We do some obsolete checking here
                   3074: 					if(-e $ulsdir.'/'.$ulsfn.".meta") { 
                   3075: 					    open(FILE, $ulsdir.'/'.$ulsfn.".meta");
                   3076: 					    my @obsolete=<FILE>;
                   3077: 					    foreach my $obsolete (@obsolete) {
                   3078: 					        if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; } 
                   3079: 						if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
                   3080: 					    }
                   3081: 					}
                   3082: 					$ulsout.=$ulsfn.'&'.join('&',@ulsstats);
                   3083: 					if($obs eq '1') { $ulsout.="&1"; }
                   3084: 					else { $ulsout.="&0"; }
                   3085: 					if($rights eq '1') { $ulsout.="&1:"; }
                   3086: 					else { $ulsout.="&0:"; }
                   3087: 				    }
                   3088: 				    closedir(LSDIR);
                   3089: 				}
                   3090: 			    } else {
                   3091: 				my @ulsstats=stat($ulsdir);
                   3092: 				$ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
                   3093: 			    }
                   3094: 			} else {
                   3095: 			    $ulsout='no_such_dir';
                   3096: 			}
                   3097: 			if ($ulsout eq '') { $ulsout='empty'; }
                   3098: 			print $client "$ulsout\n";
                   3099: 		    } else {
                   3100: 			Reply($client, "refused\n", $userinput);
                   3101: 		     
                   3102: 		    }
                   3103: # ----------------------------------------------------------------- setannounce
                   3104: 		} elsif ($userinput =~ /^setannounce/) {
                   3105: 		    if (isClient) {
                   3106: 			my ($cmd,$announcement)=split(/:/,$userinput);
                   3107: 			chomp($announcement);
                   3108: 			$announcement=&unescape($announcement);
                   3109: 			if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
                   3110: 						    '/announcement.txt')) {
                   3111: 			    print $store $announcement;
                   3112: 			    close $store;
                   3113: 			    print $client "ok\n";
                   3114: 			} else {
                   3115: 			    print $client "error: ".($!+0)."\n";
                   3116: 			}
                   3117: 		    } else {
                   3118: 			Reply($client, "refused\n", $userinput);
                   3119: 		       
                   3120: 		    }
                   3121: # ------------------------------------------------------------------ Hanging up
                   3122: 		} elsif (($userinput =~ /^exit/) ||
                   3123: 			 ($userinput =~ /^init/)) { # no restrictions.
                   3124: 		    &logthis(
                   3125: 			     "Client $clientip ($clientname) hanging up: $userinput");
                   3126: 		    print $client "bye\n";
                   3127: 		    $client->shutdown(2);        # shutdown the socket forcibly.
                   3128: 		    $client->close();
                   3129: 		    last;
1.161     foxr     3130: 
1.178     foxr     3131: # ---------------------------------- set current host/domain
                   3132: 		} elsif ($userinput =~ /^sethost:/) {
                   3133: 		    if (isClient) {
                   3134: 			print $client &sethost($userinput)."\n";
                   3135: 		    } else {
                   3136: 			print $client "refused\n";
                   3137: 		    }
                   3138: #---------------------------------- request file (?) version.
                   3139: 		} elsif ($userinput =~/^version:/) {
                   3140: 		    if (isClient) {
                   3141: 			print $client &version($userinput)."\n";
                   3142: 		    } else {
                   3143: 			print $client "refused\n";
                   3144: 		    }
1.193     raeburn  3145: #------------------------------- is auto-enrollment enabled?
1.200     matthew  3146:                 } elsif ($userinput =~/^autorun:/) {
1.193     raeburn  3147:                     if (isClient) {
1.200     matthew  3148:                         my ($cmd,$cdom) = split(/:/,$userinput);
                   3149:                         my $outcome = &localenroll::run($cdom);
1.193     raeburn  3150:                         print $client "$outcome\n";
                   3151:                     } else {
                   3152:                         print $client "0\n";
                   3153:                     }
                   3154: #------------------------------- get official sections (for auto-enrollment).
1.200     matthew  3155:                 } elsif ($userinput =~/^autogetsections:/) {
1.193     raeburn  3156:                     if (isClient) {
1.200     matthew  3157:                         my ($cmd,$coursecode,$cdom)=split(/:/,$userinput);
                   3158:                         my @secs = &localenroll::get_sections($coursecode,$cdom);
1.193     raeburn  3159:                         my $seclist = &escape(join(':',@secs));
                   3160:                         print $client "$seclist\n";
                   3161:                     } else {
                   3162:                         print $client "refused\n";
                   3163:                     }
                   3164: #----------------------- validate owner of new course section (for auto-enrollment).
1.200     matthew  3165:                 } elsif ($userinput =~/^autonewcourse:/) {
1.193     raeburn  3166:                     if (isClient) {
1.200     matthew  3167:                         my ($cmd,$inst_course_id,$owner,$cdom)=split(/:/,$userinput);
                   3168:                         my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
1.193     raeburn  3169:                         print $client "$outcome\n";
                   3170:                     } else {
                   3171:                         print $client "refused\n";
                   3172:                     }
                   3173: #-------------- validate course section in schedule of classes (for auto-enrollment).
1.200     matthew  3174:                 } elsif ($userinput =~/^autovalidatecourse:/) {
1.193     raeburn  3175:                     if (isClient) {
1.200     matthew  3176:                         my ($cmd,$inst_course_id,$cdom)=split(/:/,$userinput);
                   3177:                         my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
1.193     raeburn  3178:                         print $client "$outcome\n";
                   3179:                     } else {
                   3180:                         print $client "refused\n";
                   3181:                     }
                   3182: #--------------------------- create password for new user (for auto-enrollment).
1.200     matthew  3183:                 } elsif ($userinput =~/^autocreatepassword:/) {
1.193     raeburn  3184:                     if (isClient) {
1.200     matthew  3185:                         my ($cmd,$authparam,$cdom)=split(/:/,$userinput);
                   3186:                         my ($create_passwd,$authchk);
                   3187:                         ($authparam,$create_passwd,$authchk) = &localenroll::create_password($authparam,$cdom);
1.193     raeburn  3188:                         print $client &escape($authparam.':'.$create_passwd.':'.$authchk)."\n";
                   3189:                     } else {
                   3190:                         print $client "refused\n";
                   3191:                     }
                   3192: #---------------------------  read and remove temporary files (for auto-enrollment).
1.200     matthew  3193:                 } elsif ($userinput =~/^autoretrieve:/) {
1.193     raeburn  3194:                     if (isClient) {
                   3195:                         my ($cmd,$filename) = split(/:/,$userinput);
                   3196:                         my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
                   3197:                         if ( (-e $source) && ($filename ne '') ) {
                   3198:                             my $reply = '';
                   3199:                             if (open(my $fh,$source)) {
                   3200:                                 while (<$fh>) {
                   3201:                                     chomp($_);
                   3202:                                     $_ =~ s/^\s+//g;
                   3203:                                     $_ =~ s/\s+$//g;
                   3204:                                     $reply .= $_;
                   3205:                                 }
                   3206:                                 close($fh);
                   3207:                                 print $client &escape($reply)."\n";
                   3208: #                                unlink($source);
                   3209:                             } else {
                   3210:                                 print $client "error\n";
                   3211:                             }
                   3212:                         } else {
                   3213:                             print $client "error\n";
                   3214:                         }
                   3215:                     } else {
                   3216:                         print $client "refused\n";
                   3217:                     }
1.178     foxr     3218: # ------------------------------------------------------------- unknown command
1.161     foxr     3219: 
1.178     foxr     3220: 		} else {
                   3221: 		    # unknown command
                   3222: 		    print $client "unknown_cmd\n";
                   3223: 		}
1.177     foxr     3224: # -------------------------------------------------------------------- complete
1.178     foxr     3225: 		alarm(0);
1.200     matthew  3226: 		&status('Listening to '.$clientname." ($keymode)");
1.161     foxr     3227: 	    }
1.59      www      3228: # --------------------------------------------- client unknown or fishy, refuse
1.161     foxr     3229: 	} else {
                   3230: 	    print $client "refused\n";
                   3231: 	    $client->close();
1.190     albertel 3232: 	    &logthis("<font color='blue'>WARNING: "
1.161     foxr     3233: 		     ."Rejected client $clientip, closing connection</font>");
                   3234: 	}
                   3235:     }             
                   3236:     
1.1       albertel 3237: # =============================================================================
1.161     foxr     3238:     
1.190     albertel 3239:     &logthis("<font color='red'>CRITICAL: "
1.161     foxr     3240: 	     ."Disconnect from $clientip ($clientname)</font>");    
                   3241:     
                   3242:     
                   3243:     # this exit is VERY important, otherwise the child will become
                   3244:     # a producer of more and more children, forking yourself into
                   3245:     # process death.
                   3246:     exit;
1.106     foxr     3247:     
1.78      foxr     3248: }
                   3249: 
                   3250: 
                   3251: #
                   3252: #   Checks to see if the input roleput request was to set
                   3253: # an author role.  If so, invokes the lchtmldir script to set
                   3254: # up a correct public_html 
                   3255: # Parameters:
                   3256: #    request   - The request sent to the rolesput subchunk.
                   3257: #                We're looking for  /domain/_au
                   3258: #    domain    - The domain in which the user is having roles doctored.
                   3259: #    user      - Name of the user for which the role is being put.
                   3260: #    authtype  - The authentication type associated with the user.
                   3261: #
                   3262: sub ManagePermissions
                   3263: {
1.192     foxr     3264: 
                   3265:     my ($request, $domain, $user, $authtype) = @_;
1.78      foxr     3266: 
                   3267:     # See if the request is of the form /$domain/_au
                   3268:     if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
                   3269: 	my $execdir = $perlvar{'lonDaemons'};
                   3270: 	my $userhome= "/home/$user" ;
1.134     albertel 3271: 	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.78      foxr     3272: 	system("$execdir/lchtmldir $userhome $user $authtype");
                   3273:     }
                   3274: }
                   3275: #
                   3276: #   GetAuthType - Determines the authorization type of a user in a domain.
                   3277: 
                   3278: #     Returns the authorization type or nouser if there is no such user.
                   3279: #
                   3280: sub GetAuthType 
                   3281: {
1.192     foxr     3282: 
                   3283:     my ($domain, $user)  = @_;
1.78      foxr     3284: 
1.79      foxr     3285:     Debug("GetAuthType( $domain, $user ) \n");
1.78      foxr     3286:     my $proname    = &propath($domain, $user); 
                   3287:     my $passwdfile = "$proname/passwd";
                   3288:     if( -e $passwdfile ) {
                   3289: 	my $pf = IO::File->new($passwdfile);
                   3290: 	my $realpassword = <$pf>;
                   3291: 	chomp($realpassword);
1.79      foxr     3292: 	Debug("Password info = $realpassword\n");
1.78      foxr     3293: 	my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79      foxr     3294: 	Debug("Authtype = $authtype, content = $contentpwd\n");
1.78      foxr     3295: 	my $availinfo = '';
1.91      albertel 3296: 	if($authtype eq 'krb4' or $authtype eq 'krb5') {
1.78      foxr     3297: 	    $availinfo = $contentpwd;
                   3298: 	}
1.79      foxr     3299: 
1.78      foxr     3300: 	return "$authtype:$availinfo";
                   3301:     }
                   3302:     else {
1.79      foxr     3303: 	Debug("Returning nouser");
1.78      foxr     3304: 	return "nouser";
                   3305:     }
1.1       albertel 3306: }
                   3307: 
1.84      albertel 3308: sub addline {
                   3309:     my ($fname,$hostid,$ip,$newline)=@_;
                   3310:     my $contents;
                   3311:     my $found=0;
                   3312:     my $expr='^'.$hostid.':'.$ip.':';
                   3313:     $expr =~ s/\./\\\./g;
1.134     albertel 3314:     my $sh;
1.84      albertel 3315:     if ($sh=IO::File->new("$fname.subscription")) {
                   3316: 	while (my $subline=<$sh>) {
                   3317: 	    if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
                   3318: 	}
                   3319: 	$sh->close();
                   3320:     }
                   3321:     $sh=IO::File->new(">$fname.subscription");
                   3322:     if ($contents) { print $sh $contents; }
                   3323:     if ($newline) { print $sh $newline; }
                   3324:     $sh->close();
                   3325:     return $found;
1.86      www      3326: }
                   3327: 
                   3328: sub getchat {
1.122     www      3329:     my ($cdom,$cname,$udom,$uname)=@_;
1.87      www      3330:     my %hash;
                   3331:     my $proname=&propath($cdom,$cname);
                   3332:     my @entries=();
1.88      albertel 3333:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   3334: 	    &GDBM_READER(),0640)) {
                   3335: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   3336: 	untie %hash;
1.123     www      3337:     }
1.124     www      3338:     my @participants=();
1.134     albertel 3339:     my $cutoff=time-60;
1.123     www      3340:     if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
1.124     www      3341: 	    &GDBM_WRCREAT(),0640)) {
                   3342:         $hash{$uname.':'.$udom}=time;
1.123     www      3343:         foreach (sort keys %hash) {
                   3344: 	    if ($hash{$_}>$cutoff) {
1.124     www      3345: 		$participants[$#participants+1]='active_participant:'.$_;
1.123     www      3346:             }
                   3347:         }
                   3348:         untie %hash;
1.86      www      3349:     }
1.124     www      3350:     return (@participants,@entries);
1.86      www      3351: }
                   3352: 
                   3353: sub chatadd {
1.88      albertel 3354:     my ($cdom,$cname,$newchat)=@_;
                   3355:     my %hash;
                   3356:     my $proname=&propath($cdom,$cname);
                   3357:     my @entries=();
1.142     www      3358:     my $time=time;
1.88      albertel 3359:     if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
                   3360: 	    &GDBM_WRCREAT(),0640)) {
                   3361: 	@entries=map { $_.':'.$hash{$_} } sort keys %hash;
                   3362: 	my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
                   3363: 	my ($thentime,$idnum)=split(/\_/,$lastid);
                   3364: 	my $newid=$time.'_000000';
                   3365: 	if ($thentime==$time) {
                   3366: 	    $idnum=~s/^0+//;
                   3367: 	    $idnum++;
                   3368: 	    $idnum=substr('000000'.$idnum,-6,6);
                   3369: 	    $newid=$time.'_'.$idnum;
                   3370: 	}
                   3371: 	$hash{$newid}=$newchat;
                   3372: 	my $expired=$time-3600;
                   3373: 	foreach (keys %hash) {
                   3374: 	    my ($thistime)=($_=~/(\d+)\_/);
                   3375: 	    if ($thistime<$expired) {
1.89      www      3376: 		delete $hash{$_};
1.88      albertel 3377: 	    }
                   3378: 	}
                   3379: 	untie %hash;
1.142     www      3380:     }
                   3381:     {
                   3382: 	my $hfh;
                   3383: 	if ($hfh=IO::File->new(">>$proname/chatroom.log")) { 
                   3384: 	    print $hfh "$time:".&unescape($newchat)."\n";
                   3385: 	}
1.86      www      3386:     }
1.84      albertel 3387: }
                   3388: 
                   3389: sub unsub {
                   3390:     my ($fname,$clientip)=@_;
                   3391:     my $result;
1.188     foxr     3392:     my $unsubs = 0;		# Number of successful unsubscribes:
                   3393: 
                   3394: 
                   3395:     # An old way subscriptions were handled was to have a 
                   3396:     # subscription marker file:
                   3397: 
                   3398:     Debug("Attempting unlink of $fname.$clientname");
1.161     foxr     3399:     if (unlink("$fname.$clientname")) {
1.188     foxr     3400: 	$unsubs++;		# Successful unsub via marker file.
                   3401:     } 
                   3402: 
                   3403:     # The more modern way to do it is to have a subscription list
                   3404:     # file:
                   3405: 
1.84      albertel 3406:     if (-e "$fname.subscription") {
1.161     foxr     3407: 	my $found=&addline($fname,$clientname,$clientip,'');
1.188     foxr     3408: 	if ($found) { 
                   3409: 	    $unsubs++;
                   3410: 	}
                   3411:     } 
                   3412: 
                   3413:     #  If either or both of these mechanisms succeeded in unsubscribing a 
                   3414:     #  resource we can return ok:
                   3415: 
                   3416:     if($unsubs) {
                   3417: 	$result = "ok\n";
1.84      albertel 3418:     } else {
1.188     foxr     3419: 	$result = "not_subscribed\n";
1.84      albertel 3420:     }
1.188     foxr     3421: 
1.84      albertel 3422:     return $result;
                   3423: }
                   3424: 
1.101     www      3425: sub currentversion {
                   3426:     my $fname=shift;
                   3427:     my $version=-1;
                   3428:     my $ulsdir='';
                   3429:     if ($fname=~/^(.+)\/[^\/]+$/) {
                   3430:        $ulsdir=$1;
                   3431:     }
1.114     albertel 3432:     my ($fnamere1,$fnamere2);
                   3433:     # remove version if already specified
1.101     www      3434:     $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114     albertel 3435:     # get the bits that go before and after the version number
                   3436:     if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
                   3437: 	$fnamere1=$1;
                   3438: 	$fnamere2='.'.$2;
                   3439:     }
1.101     www      3440:     if (-e $fname) { $version=1; }
                   3441:     if (-e $ulsdir) {
1.134     albertel 3442: 	if(-d $ulsdir) {
                   3443: 	    if (opendir(LSDIR,$ulsdir)) {
                   3444: 		my $ulsfn;
                   3445: 		while ($ulsfn=readdir(LSDIR)) {
1.101     www      3446: # see if this is a regular file (ignore links produced earlier)
1.134     albertel 3447: 		    my $thisfile=$ulsdir.'/'.$ulsfn;
                   3448: 		    unless (-l $thisfile) {
1.160     www      3449: 			if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134     albertel 3450: 			    if ($1>$version) { $version=$1; }
                   3451: 			}
                   3452: 		    }
                   3453: 		}
                   3454: 		closedir(LSDIR);
                   3455: 		$version++;
                   3456: 	    }
                   3457: 	}
                   3458:     }
                   3459:     return $version;
1.101     www      3460: }
                   3461: 
                   3462: sub thisversion {
                   3463:     my $fname=shift;
                   3464:     my $version=-1;
                   3465:     if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
                   3466: 	$version=$1;
                   3467:     }
                   3468:     return $version;
                   3469: }
                   3470: 
1.84      albertel 3471: sub subscribe {
                   3472:     my ($userinput,$clientip)=@_;
                   3473:     my $result;
                   3474:     my ($cmd,$fname)=split(/:/,$userinput);
                   3475:     my $ownership=&ishome($fname);
                   3476:     if ($ownership eq 'owner') {
1.101     www      3477: # explitly asking for the current version?
                   3478:         unless (-e $fname) {
                   3479:             my $currentversion=&currentversion($fname);
                   3480: 	    if (&thisversion($fname)==$currentversion) {
                   3481:                 if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
                   3482: 		    my $root=$1;
                   3483:                     my $extension=$2;
                   3484:                     symlink($root.'.'.$extension,
                   3485:                             $root.'.'.$currentversion.'.'.$extension);
1.102     www      3486:                     unless ($extension=~/\.meta$/) {
                   3487:                        symlink($root.'.'.$extension.'.meta',
                   3488:                             $root.'.'.$currentversion.'.'.$extension.'.meta');
                   3489: 		    }
1.101     www      3490:                 }
                   3491:             }
                   3492:         }
1.84      albertel 3493: 	if (-e $fname) {
                   3494: 	    if (-d $fname) {
                   3495: 		$result="directory\n";
                   3496: 	    } else {
1.161     foxr     3497: 		if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134     albertel 3498: 		my $now=time;
1.161     foxr     3499: 		my $found=&addline($fname,$clientname,$clientip,
                   3500: 				   "$clientname:$clientip:$now\n");
1.84      albertel 3501: 		if ($found) { $result="$fname\n"; }
                   3502: 		# if they were subscribed to only meta data, delete that
                   3503:                 # subscription, when you subscribe to a file you also get
                   3504:                 # the metadata
                   3505: 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
                   3506: 		$fname=~s/\/home\/httpd\/html\/res/raw/;
                   3507: 		$fname="http://$thisserver/".$fname;
                   3508: 		$result="$fname\n";
                   3509: 	    }
                   3510: 	} else {
                   3511: 	    $result="not_found\n";
                   3512: 	}
                   3513:     } else {
                   3514: 	$result="rejected\n";
                   3515:     }
                   3516:     return $result;
                   3517: }
1.91      albertel 3518: 
                   3519: sub make_passwd_file {
1.98      foxr     3520:     my ($uname, $umode,$npass,$passfilename)=@_;
1.91      albertel 3521:     my $result="ok\n";
                   3522:     if ($umode eq 'krb4' or $umode eq 'krb5') {
                   3523: 	{
                   3524: 	    my $pf = IO::File->new(">$passfilename");
                   3525: 	    print $pf "$umode:$npass\n";
                   3526: 	}
                   3527:     } elsif ($umode eq 'internal') {
                   3528: 	my $salt=time;
                   3529: 	$salt=substr($salt,6,2);
                   3530: 	my $ncpass=crypt($npass,$salt);
                   3531: 	{
                   3532: 	    &Debug("Creating internal auth");
                   3533: 	    my $pf = IO::File->new(">$passfilename");
                   3534: 	    print $pf "internal:$ncpass\n"; 
                   3535: 	}
                   3536:     } elsif ($umode eq 'localauth') {
                   3537: 	{
                   3538: 	    my $pf = IO::File->new(">$passfilename");
                   3539: 	    print $pf "localauth:$npass\n";
                   3540: 	}
                   3541:     } elsif ($umode eq 'unix') {
                   3542: 	{
1.186     foxr     3543: 	    #
                   3544: 	    #  Don't allow the creation of privileged accounts!!! that would
                   3545: 	    #  be real bad!!!
                   3546: 	    #
                   3547: 	    my $uid = getpwnam($uname);
                   3548: 	    if((defined $uid) && ($uid == 0)) {
                   3549: 		&logthis(">>>Attempted to create privilged account blocked");
                   3550: 		return "no_priv_account_error\n";
                   3551: 	    }
                   3552: 
1.91      albertel 3553: 	    my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
                   3554: 	    {
                   3555: 		&Debug("Executing external: ".$execpath);
1.98      foxr     3556: 		&Debug("user  = ".$uname.", Password =". $npass);
1.132     matthew  3557: 		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91      albertel 3558: 		print $se "$uname\n";
                   3559: 		print $se "$npass\n";
                   3560: 		print $se "$npass\n";
1.97      foxr     3561: 	    }
                   3562: 	    my $useraddok = $?;
                   3563: 	    if($useraddok > 0) {
                   3564: 		&logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
1.91      albertel 3565: 	    }
                   3566: 	    my $pf = IO::File->new(">$passfilename");
                   3567: 	    print $pf "unix:\n";
                   3568: 	}
                   3569:     } elsif ($umode eq 'none') {
                   3570: 	{
                   3571: 	    my $pf = IO::File->new(">$passfilename");
                   3572: 	    print $pf "none:\n";
                   3573: 	}
                   3574:     } else {
                   3575: 	$result="auth_mode_error\n";
                   3576:     }
                   3577:     return $result;
1.121     albertel 3578: }
                   3579: 
                   3580: sub sethost {
                   3581:     my ($remotereq) = @_;
                   3582:     my (undef,$hostid)=split(/:/,$remotereq);
                   3583:     if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
                   3584:     if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
1.200     matthew  3585: 	$currenthostid  =$hostid;
1.121     albertel 3586: 	$currentdomainid=$hostdom{$hostid};
                   3587: 	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
                   3588:     } else {
                   3589: 	&logthis("Requested host id $hostid not an alias of ".
                   3590: 		 $perlvar{'lonHostID'}." refusing connection");
                   3591: 	return 'unable_to_set';
                   3592:     }
                   3593:     return 'ok';
                   3594: }
                   3595: 
                   3596: sub version {
                   3597:     my ($userinput)=@_;
                   3598:     $remoteVERSION=(split(/:/,$userinput))[1];
                   3599:     return "version:$VERSION";
1.127     albertel 3600: }
1.178     foxr     3601: 
1.128     albertel 3602: #There is a copy of this in lonnet.pm
1.127     albertel 3603: sub userload {
                   3604:     my $numusers=0;
                   3605:     {
                   3606: 	opendir(LONIDS,$perlvar{'lonIDsDir'});
                   3607: 	my $filename;
                   3608: 	my $curtime=time;
                   3609: 	while ($filename=readdir(LONIDS)) {
                   3610: 	    if ($filename eq '.' || $filename eq '..') {next;}
1.138     albertel 3611: 	    my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159     albertel 3612: 	    if ($curtime-$mtime < 1800) { $numusers++; }
1.127     albertel 3613: 	}
                   3614: 	closedir(LONIDS);
                   3615:     }
                   3616:     my $userloadpercent=0;
                   3617:     my $maxuserload=$perlvar{'lonUserLoadLim'};
                   3618:     if ($maxuserload) {
1.129     albertel 3619: 	$userloadpercent=100*$numusers/$maxuserload;
1.127     albertel 3620:     }
1.130     albertel 3621:     $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127     albertel 3622:     return $userloadpercent;
1.91      albertel 3623: }
                   3624: 
1.200     matthew  3625: 
1.61      harris41 3626: # ----------------------------------- POD (plain old documentation, CPAN style)
                   3627: 
                   3628: =head1 NAME
                   3629: 
                   3630: lond - "LON Daemon" Server (port "LOND" 5663)
                   3631: 
                   3632: =head1 SYNOPSIS
                   3633: 
1.74      harris41 3634: Usage: B<lond>
                   3635: 
                   3636: Should only be run as user=www.  This is a command-line script which
                   3637: is invoked by B<loncron>.  There is no expectation that a typical user
                   3638: will manually start B<lond> from the command-line.  (In other words,
                   3639: DO NOT START B<lond> YOURSELF.)
1.61      harris41 3640: 
                   3641: =head1 DESCRIPTION
                   3642: 
1.74      harris41 3643: There are two characteristics associated with the running of B<lond>,
                   3644: PROCESS MANAGEMENT (starting, stopping, handling child processes)
                   3645: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
                   3646: subscriptions, etc).  These are described in two large
                   3647: sections below.
                   3648: 
                   3649: B<PROCESS MANAGEMENT>
                   3650: 
1.61      harris41 3651: Preforker - server who forks first. Runs as a daemon. HUPs.
                   3652: Uses IDEA encryption
                   3653: 
1.74      harris41 3654: B<lond> forks off children processes that correspond to the other servers
                   3655: in the network.  Management of these processes can be done at the
                   3656: parent process level or the child process level.
                   3657: 
                   3658: B<logs/lond.log> is the location of log messages.
                   3659: 
                   3660: The process management is now explained in terms of linux shell commands,
                   3661: subroutines internal to this code, and signal assignments:
                   3662: 
                   3663: =over 4
                   3664: 
                   3665: =item *
                   3666: 
                   3667: PID is stored in B<logs/lond.pid>
                   3668: 
                   3669: This is the process id number of the parent B<lond> process.
                   3670: 
                   3671: =item *
                   3672: 
                   3673: SIGTERM and SIGINT
                   3674: 
                   3675: Parent signal assignment:
                   3676:  $SIG{INT}  = $SIG{TERM} = \&HUNTSMAN;
                   3677: 
                   3678: Child signal assignment:
                   3679:  $SIG{INT}  = 'DEFAULT'; (and SIGTERM is DEFAULT also)
                   3680: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
                   3681:  to restart a new child.)
                   3682: 
                   3683: Command-line invocations:
                   3684:  B<kill> B<-s> SIGTERM I<PID>
                   3685:  B<kill> B<-s> SIGINT I<PID>
                   3686: 
                   3687: Subroutine B<HUNTSMAN>:
                   3688:  This is only invoked for the B<lond> parent I<PID>.
                   3689: This kills all the children, and then the parent.
                   3690: The B<lonc.pid> file is cleared.
                   3691: 
                   3692: =item *
                   3693: 
                   3694: SIGHUP
                   3695: 
                   3696: Current bug:
                   3697:  This signal can only be processed the first time
                   3698: on the parent process.  Subsequent SIGHUP signals
                   3699: have no effect.
                   3700: 
                   3701: Parent signal assignment:
                   3702:  $SIG{HUP}  = \&HUPSMAN;
                   3703: 
                   3704: Child signal assignment:
                   3705:  none (nothing happens)
                   3706: 
                   3707: Command-line invocations:
                   3708:  B<kill> B<-s> SIGHUP I<PID>
                   3709: 
                   3710: Subroutine B<HUPSMAN>:
                   3711:  This is only invoked for the B<lond> parent I<PID>,
                   3712: This kills all the children, and then the parent.
                   3713: The B<lond.pid> file is cleared.
                   3714: 
                   3715: =item *
                   3716: 
                   3717: SIGUSR1
                   3718: 
                   3719: Parent signal assignment:
                   3720:  $SIG{USR1} = \&USRMAN;
                   3721: 
                   3722: Child signal assignment:
                   3723:  $SIG{USR1}= \&logstatus;
                   3724: 
                   3725: Command-line invocations:
                   3726:  B<kill> B<-s> SIGUSR1 I<PID>
                   3727: 
                   3728: Subroutine B<USRMAN>:
                   3729:  When invoked for the B<lond> parent I<PID>,
                   3730: SIGUSR1 is sent to all the children, and the status of
                   3731: each connection is logged.
1.144     foxr     3732: 
                   3733: =item *
                   3734: 
                   3735: SIGUSR2
                   3736: 
                   3737: Parent Signal assignment:
                   3738:     $SIG{USR2} = \&UpdateHosts
                   3739: 
                   3740: Child signal assignment:
                   3741:     NONE
                   3742: 
1.74      harris41 3743: 
                   3744: =item *
                   3745: 
                   3746: SIGCHLD
                   3747: 
                   3748: Parent signal assignment:
                   3749:  $SIG{CHLD} = \&REAPER;
                   3750: 
                   3751: Child signal assignment:
                   3752:  none
                   3753: 
                   3754: Command-line invocations:
                   3755:  B<kill> B<-s> SIGCHLD I<PID>
                   3756: 
                   3757: Subroutine B<REAPER>:
                   3758:  This is only invoked for the B<lond> parent I<PID>.
                   3759: Information pertaining to the child is removed.
                   3760: The socket port is cleaned up.
                   3761: 
                   3762: =back
                   3763: 
                   3764: B<SERVER-SIDE ACTIVITIES>
                   3765: 
                   3766: Server-side information can be accepted in an encrypted or non-encrypted
                   3767: method.
                   3768: 
                   3769: =over 4
                   3770: 
                   3771: =item ping
                   3772: 
                   3773: Query a client in the hosts.tab table; "Are you there?"
                   3774: 
                   3775: =item pong
                   3776: 
                   3777: Respond to a ping query.
                   3778: 
                   3779: =item ekey
                   3780: 
                   3781: Read in encrypted key, make cipher.  Respond with a buildkey.
                   3782: 
                   3783: =item load
                   3784: 
                   3785: Respond with CPU load based on a computation upon /proc/loadavg.
                   3786: 
                   3787: =item currentauth
                   3788: 
                   3789: Reply with current authentication information (only over an
                   3790: encrypted channel).
                   3791: 
                   3792: =item auth
                   3793: 
                   3794: Only over an encrypted channel, reply as to whether a user's
                   3795: authentication information can be validated.
                   3796: 
                   3797: =item passwd
                   3798: 
                   3799: Allow for a password to be set.
                   3800: 
                   3801: =item makeuser
                   3802: 
                   3803: Make a user.
                   3804: 
                   3805: =item passwd
                   3806: 
                   3807: Allow for authentication mechanism and password to be changed.
                   3808: 
                   3809: =item home
1.61      harris41 3810: 
1.74      harris41 3811: Respond to a question "are you the home for a given user?"
                   3812: 
                   3813: =item update
                   3814: 
                   3815: Update contents of a subscribed resource.
                   3816: 
                   3817: =item unsubscribe
                   3818: 
                   3819: The server is unsubscribing from a resource.
                   3820: 
                   3821: =item subscribe
                   3822: 
                   3823: The server is subscribing to a resource.
                   3824: 
                   3825: =item log
                   3826: 
                   3827: Place in B<logs/lond.log>
                   3828: 
                   3829: =item put
                   3830: 
                   3831: stores hash in namespace
                   3832: 
                   3833: =item rolesput
                   3834: 
                   3835: put a role into a user's environment
                   3836: 
                   3837: =item get
                   3838: 
                   3839: returns hash with keys from array
                   3840: reference filled in from namespace
                   3841: 
                   3842: =item eget
                   3843: 
                   3844: returns hash with keys from array
                   3845: reference filled in from namesp (encrypts the return communication)
                   3846: 
                   3847: =item rolesget
                   3848: 
                   3849: get a role from a user's environment
                   3850: 
                   3851: =item del
                   3852: 
                   3853: deletes keys out of array from namespace
                   3854: 
                   3855: =item keys
                   3856: 
                   3857: returns namespace keys
                   3858: 
                   3859: =item dump
                   3860: 
                   3861: dumps the complete (or key matching regexp) namespace into a hash
                   3862: 
                   3863: =item store
                   3864: 
                   3865: stores hash permanently
                   3866: for this url; hashref needs to be given and should be a \%hashname; the
                   3867: remaining args aren't required and if they aren't passed or are '' they will
                   3868: be derived from the ENV
                   3869: 
                   3870: =item restore
                   3871: 
                   3872: returns a hash for a given url
                   3873: 
                   3874: =item querysend
                   3875: 
                   3876: Tells client about the lonsql process that has been launched in response
                   3877: to a sent query.
                   3878: 
                   3879: =item queryreply
                   3880: 
                   3881: Accept information from lonsql and make appropriate storage in temporary
                   3882: file space.
                   3883: 
                   3884: =item idput
                   3885: 
                   3886: Defines usernames as corresponding to IDs.  (These "IDs" are unique identifiers
                   3887: for each student, defined perhaps by the institutional Registrar.)
                   3888: 
                   3889: =item idget
                   3890: 
                   3891: Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
                   3892: for each student, defined perhaps by the institutional Registrar.)
                   3893: 
                   3894: =item tmpput
                   3895: 
                   3896: Accept and store information in temporary space.
                   3897: 
                   3898: =item tmpget
                   3899: 
                   3900: Send along temporarily stored information.
                   3901: 
                   3902: =item ls
                   3903: 
                   3904: List part of a user's directory.
                   3905: 
1.135     foxr     3906: =item pushtable
                   3907: 
                   3908: Pushes a file in /home/httpd/lonTab directory.  Currently limited to:
                   3909: hosts.tab and domain.tab. The old file is copied to  *.tab.backup but
                   3910: must be restored manually in case of a problem with the new table file.
                   3911: pushtable requires that the request be encrypted and validated via
                   3912: ValidateManager.  The form of the command is:
                   3913: enc:pushtable tablename <tablecontents> \n
                   3914: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a 
                   3915: cleartext newline.
                   3916: 
1.74      harris41 3917: =item Hanging up (exit or init)
                   3918: 
                   3919: What to do when a client tells the server that they (the client)
                   3920: are leaving the network.
                   3921: 
                   3922: =item unknown command
                   3923: 
                   3924: If B<lond> is sent an unknown command (not in the list above),
                   3925: it replys to the client "unknown_cmd".
1.135     foxr     3926: 
1.74      harris41 3927: 
                   3928: =item UNKNOWN CLIENT
                   3929: 
                   3930: If the anti-spoofing algorithm cannot verify the client,
                   3931: the client is rejected (with a "refused" message sent
                   3932: to the client, and the connection is closed.
                   3933: 
                   3934: =back
1.61      harris41 3935: 
                   3936: =head1 PREREQUISITES
                   3937: 
                   3938: IO::Socket
                   3939: IO::File
                   3940: Apache::File
                   3941: Symbol
                   3942: POSIX
                   3943: Crypt::IDEA
                   3944: LWP::UserAgent()
                   3945: GDBM_File
                   3946: Authen::Krb4
1.91      albertel 3947: Authen::Krb5
1.61      harris41 3948: 
                   3949: =head1 COREQUISITES
                   3950: 
                   3951: =head1 OSNAMES
                   3952: 
                   3953: linux
                   3954: 
                   3955: =head1 SCRIPT CATEGORIES
                   3956: 
                   3957: Server/Process
                   3958: 
                   3959: =cut

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