Annotation of loncom/lond, revision 1.178.2.23
1.1 albertel 1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60 www 4: #
1.178.2.23! www 5: # $Id: lond,v 1.178.2.22 2004/05/04 10:09:38 foxr Exp $
1.60 www 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
1.167 foxr 13: # the Free Software Foundation; either version 2 of the License, or
1.60 www 14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
1.178.2.1 foxr 23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1.60 www 24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
1.161 foxr 27:
28:
1.60 www 29: # http://www.lon-capa.org/
30: #
1.54 harris41 31:
1.134 albertel 32: use strict;
1.80 harris41 33: use lib '/home/httpd/lib/perl/';
34: use LONCAPA::Configuration;
35:
1.1 albertel 36: use IO::Socket;
37: use IO::File;
1.126 albertel 38: #use Apache::File;
1.1 albertel 39: use Symbol;
40: use POSIX;
41: use Crypt::IDEA;
42: use LWP::UserAgent();
1.3 www 43: use GDBM_File;
44: use Authen::Krb4;
1.91 albertel 45: use Authen::Krb5;
1.49 albertel 46: use lib '/home/httpd/lib/perl/';
47: use localauth;
1.143 foxr 48: use File::Copy;
1.169 foxr 49: use LONCAPA::ConfigFileEdit;
1.1 albertel 50:
1.178.2.2 foxr 51: my $DEBUG = 1; # Non zero to enable debug log entries.
1.77 foxr 52:
1.57 www 53: my $status='';
54: my $lastlog='';
55:
1.178.2.23! www 56: my $VERSION='$Revision: 1.178.2.22 $'; #' stupid emacs
1.121 albertel 57: my $remoteVERSION;
1.115 albertel 58: my $currenthostid;
59: my $currentdomainid;
1.134 albertel 60:
61: my $client;
1.140 foxr 62: my $clientip;
1.161 foxr 63: my $clientname;
1.140 foxr 64:
1.178.2.1 foxr 65: my $cipher; # Cipher key negotiated with client.
66: my $tmpsnum = 0;; # Id of tmpputs.
67:
1.134 albertel 68: my $server;
69: my $thisserver;
70:
1.178.2.1 foxr 71: #
72: # Connection type is:
73: # client - All client actions are allowed
74: # manager - only management functions allowed.
75: # both - Both management and client actions are allowed
76: #
77:
78: my $ConnectionType;
79:
80: my %hostid;
81: my %hostdom;
82: my %hostip;
83:
84: my %managers; # Ip -> manager names
85:
86: my %perlvar; # Will have the apache conf defined perl vars.
87:
88: #
89: # The hash below is used for command dispatching, and is therefore keyed on the request keyword.
90: # Each element of the hash contains a reference to an array that contains:
91: # A reference to a sub that executes the request corresponding to the keyword.
92: # A flag that is true if the request must be encoded to be acceptable.
93: # A mask with bits as follows:
94: # CLIENT_OK - Set when the function is allowed by ordinary clients
95: # MANAGER_OK - Set when the function is allowed to manager clients.
96: #
97: my $CLIENT_OK = 1;
98: my $MANAGER_OK = 2;
99: my %Dispatcher;
100:
101: #
102: # The array below are password error strings."
103: #
104: my $lastpwderror = 13; # Largest error number from lcpasswd.
105: my @passwderrors = ("ok",
106: "lcpasswd must be run as user 'www'",
107: "lcpasswd got incorrect number of arguments",
108: "lcpasswd did not get the right nubmer of input text lines",
109: "lcpasswd too many simultaneous pwd changes in progress",
110: "lcpasswd User does not exist.",
111: "lcpasswd Incorrect current passwd",
112: "lcpasswd Unable to su to root.",
113: "lcpasswd Cannot set new passwd.",
114: "lcpasswd Username has invalid characters",
115: "lcpasswd Invalid characters in password",
116: "11", "12",
117: "lcpasswd Password mismatch");
118:
119:
120: # The array below are lcuseradd error strings.:
121:
122: my $lastadderror = 13;
123: my @adderrors = ("ok",
124: "User ID mismatch, lcuseradd must run as user www",
125: "lcuseradd Incorrect number of command line parameters must be 3",
126: "lcuseradd Incorrect number of stdinput lines, must be 3",
127: "lcuseradd Too many other simultaneous pwd changes in progress",
128: "lcuseradd User does not exist",
129: "lcuseradd Unable to make www member of users's group",
130: "lcuseradd Unable to su to root",
131: "lcuseradd Unable to set password",
132: "lcuseradd Usrname has invalid characters",
133: "lcuseradd Password has an invalid character",
134: "lcuseradd User already exists",
135: "lcuseradd Could not add user.",
136: "lcuseradd Password mismatch");
137:
138: #
139: # Statistics that are maintained and dislayed in the status line.
140: #
141: my $Transactions; # Number of attempted transactions.
142: my $Failures; # Number of transcations failed.
143:
144: # ResetStatistics:
145: # Resets the statistics counters:
146: #
147: sub ResetStatistics {
148: $Transactions = 0;
149: $Failures = 0;
150: }
151:
152: #
153: # Return true if client is a manager.
154: #
155: sub isManager {
156: return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
157: }
158: #
159: # Return tru if client can do client functions
160: #
161: sub isClient {
162: return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
163: }
1.178.2.8 foxr 164: #
1.178.2.9 foxr 165: # Ties a domain level resource file to a hash.
166: # If requested a history entry is created in the associated hist file.
167: #
168: # Parameters:
169: # domain - Name of the domain in which the resource file lives.
170: # namespace - Name of the hash within that domain.
171: # how - How to tie the hash (e.g. GDBM_WRCREAT()).
172: # loghead - Optional parameter, if present a log entry is created
173: # in the associated history file and this is the first part
174: # of that entry.
175: # logtail - Goes along with loghead, The actual logentry is of the
176: # form $loghead:<timestamp>:logtail.
177: # Returns:
178: # Reference to a hash bound to the db file or alternatively undef
179: # if the tie failed.
180: #
181: sub TieDomainHash {
182: my $domain = shift;
183: my $namespace = shift;
184: my $how = shift;
1.178.2.10 foxr 185:
1.178.2.9 foxr 186: # Filter out any whitespace in the domain name:
1.178.2.10 foxr 187:
1.178.2.9 foxr 188: $domain =~ s/\W//g;
1.178.2.10 foxr 189:
1.178.2.9 foxr 190: # We have enough to go on to tie the hash:
1.178.2.10 foxr 191:
192: my $UserTopDir = $perlvar{'lonUsersDir'};
1.178.2.9 foxr 193: my $DomainDir = $UserTopDir."/$domain";
194: my $ResourceFile = $DomainDir."/$namespace.db";
195: my %hash;
196: if(tie(%hash, 'GDBM_File', $ResourceFile, $how, 0640)) {
197: if (scalar @_) { # Need to log the operation.
198: my $logFh = IO::File->new(">>$DomainDir/$namespace.hist");
1.178.2.10 foxr 199: if($logFh) {
1.178.2.9 foxr 200: my $TimeStamp = time;
201: my ($loghead, $logtail) = @_;
1.178.2.10 foxr 202: print $logFh "$loghead:$TimeStamp:$logtail\n";
1.178.2.9 foxr 203: }
204: }
205: return \%hash; # Return the tied hash.
206: }
207: else {
208: return undef; # Tie failed.
209: }
210: }
211:
212: #
213: # Ties a user's resource file to a hash.
214: # If necessary, an appropriate history
1.178.2.8 foxr 215: # log file entry is made as well.
216: # This sub factors out common code from the subs that manipulate
217: # the various gdbm files that keep keyword value pairs.
218: # Parameters:
219: # domain - Name of the domain the user is in.
220: # user - Name of the 'current user'.
221: # namespace - Namespace representing the file to tie.
222: # how - What the tie is done to (e.g. GDBM_WRCREAT().
223: # loghead - Optional first part of log entry if there may be a
224: # history file.
225: # what - Optional tail of log entry if there may be a history
226: # file.
227: # Returns:
228: # hash to which the database is tied. It's up to the caller to untie.
229: # undef if the has could not be tied.
230: #
1.178.2.9 foxr 231: sub TieUserHash {
1.178.2.10 foxr 232: my $domain = shift;
233: my $user = shift;
234: my $namespace = shift;
235: my $how = shift;
236:
237: $namespace=~s/\//\_/g; # / -> _
238: $namespace=~s/\W//g; # whitespace eliminated.
239: my $proname = propath($domain, $user);
1.178.2.13 foxr 240:
1.178.2.10 foxr 241: # If this is a namespace for which a history is kept,
242: # make the history log entry:
243:
244:
1.178.2.22 foxr 245: if (($namespace =~/^nohist\_/) && (scalar @_ > 0)) {
246: my $args = scalar @_;
247: Debug(" Opening history: $namespace $args");
1.178.2.10 foxr 248: my $hfh = IO::File->new(">>$proname/$namespace.hist");
249: if($hfh) {
250: my $now = time;
251: my $loghead = shift;
252: my $what = shift;
253: print $hfh "$loghead:$now:$what\n";
254: }
255: }
256: # Tie the database.
257:
258: my %hash;
1.178.2.12 foxr 259: if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
1.178.2.10 foxr 260: $how, 0640)) {
261: return \%hash;
262: }
263: else {
264: return undef;
265: }
266:
1.178.2.8 foxr 267: }
1.178.2.1 foxr 268:
269: #
270: # Get a Request:
271: # Gets a Request message from the client. The transaction
272: # is defined as a 'line' of text. We remove the new line
273: # from the text line.
274: #
275: sub GetRequest {
276: my $input = <$client>;
277: chomp($input);
278:
279: Debug("Request = $input\n");
280:
281: &status('Processing '.$clientname.':'.$input);
282:
283: return $input;
284: }
285: #
286: # Decipher encoded traffic
287: # Parameters:
288: # input - Encoded data.
289: # Returns:
290: # Decoded data or undef if encryption key was not yet negotiated.
291: # Implicit input:
292: # cipher - This global holds the negotiated encryption key.
293: #
294: sub Decipher {
1.178.2.4 albertel 295: my $input = shift;
296: my $output = '';
1.178.2.1 foxr 297:
298:
1.178.2.4 albertel 299: if($cipher) {
300: my($enc, $enclength, $encinput) = split(/:/, $input);
301: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
302: $output .=
303: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
304: }
305: return substr($output, 0, $enclength);
306: } else {
307: return undef;
308: }
1.178.2.1 foxr 309: }
310:
311: #
312: # Register a command processor. This function is invoked to register a sub
313: # to process a request. Once registered, the ProcessRequest sub can automatically
314: # dispatch requests to an appropriate sub, and do the top level validity checking
315: # as well:
316: # - Is the keyword recognized.
317: # - Is the proper client type attempting the request.
318: # - Is the request encrypted if it has to be.
319: # Parameters:
320: # $RequestName - Name of the request being registered.
321: # This is the command request that will match
322: # against the hash keywords to lookup the information
323: # associated with the dispatch information.
324: # $Procedure - Reference to a sub to call to process the request.
325: # All subs get called as follows:
326: # Procedure($cmd, $tail, $replyfd, $key)
327: # $cmd - the actual keyword that invoked us.
328: # $tail - the tail of the request that invoked us.
329: # $replyfd- File descriptor connected to the client
330: # $MustEncode - True if the request must be encoded to be good.
331: # $ClientOk - True if it's ok for a client to request this.
332: # $ManagerOk - True if it's ok for a manager to request this.
333: # Side effects:
334: # - On success, the Dispatcher hash has an entry added for the key $RequestName
335: # - On failure, the program will die as it's a bad internal bug to try to
336: # register a duplicate command handler.
337: #
338: sub RegisterHandler {
1.178.2.4 albertel 339: my $RequestName = shift;
340: my $Procedure = shift;
341: my $MustEncode = shift;
342: my $ClientOk = shift;
343: my $ManagerOk = shift;
344:
345: # Don't allow duplication#
1.178.2.1 foxr 346:
1.178.2.4 albertel 347: if (defined $Dispatcher{$RequestName}) {
348: die "Attempting to define a duplicate request handler for $RequestName\n";
349: }
350: # Build the client type mask:
351:
352: my $ClientTypeMask = 0;
353: if($ClientOk) {
354: $ClientTypeMask |= $CLIENT_OK;
355: }
356: if($ManagerOk) {
357: $ClientTypeMask |= $MANAGER_OK;
358: }
359:
360: # Enter the hash:
1.178.2.1 foxr 361:
1.178.2.4 albertel 362: my @entry = ($Procedure, $MustEncode, $ClientTypeMask);
1.178.2.1 foxr 363:
1.178.2.4 albertel 364: $Dispatcher{$RequestName} = \@entry;
1.178.2.1 foxr 365:
366:
367: }
368:
369: #--------------------- Request Handlers --------------------------------------------
370: #
371: # By convention each request handler registers itself prior to the sub declaration:
372: #
373:
374: # Handles ping requests.
375: # Parameters:
376: # $cmd - the actual keyword that invoked us.
377: # $tail - the tail of the request that invoked us.
378: # $replyfd- File descriptor connected to the client
379: # Implicit Inputs:
380: # $currenthostid - Global variable that carries the name of the host we are
381: # known as.
382: # Returns:
383: # 1 - Ok to continue processing.
384: # 0 - Program should exit.
385: # Side effects:
386: # Reply information is sent to the client.
387:
388: sub PingHandler {
1.178.2.4 albertel 389: my $cmd = shift;
390: my $tail = shift;
391: my $client = shift;
1.178.2.1 foxr 392:
1.178.2.4 albertel 393: Reply( $client,"$currenthostid\n","$cmd:$tail");
1.178.2.1 foxr 394:
1.178.2.4 albertel 395: return 1;
1.178.2.1 foxr 396: }
397: RegisterHandler("ping", \&PingHandler, 0, 1, 1); # Ping unencoded, client or manager.
398: #
399: # Handles pong reequests:
400: # Parameters:
401: # $cmd - the actual keyword that invoked us.
402: # $tail - the tail of the request that invoked us.
403: # $replyfd- File descriptor connected to the client
404: # Implicit Inputs:
405: # $currenthostid - Global variable that carries the name of the host we are
406: # connected to.
407: # Returns:
408: # 1 - Ok to continue processing.
409: # 0 - Program should exit.
410: # Side effects:
411: # Reply information is sent to the client.
412:
413: sub PongHandler {
1.178.2.4 albertel 414: my $cmd = shift;
415: my $tail = shift;
416: my $replyfd = shift;
417:
418: my $reply=&reply("ping",$clientname);
419: Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
420: return 1;
1.178.2.1 foxr 421: }
422: RegisterHandler("pong", \&PongHandler, 0, 1, 1); # Pong unencoded, client or manager
423:
424: #
425: # EstablishKeyHandler:
426: # Called to establish an encrypted session key with the remote client.
427: #
428: # Parameters:
429: # $cmd - the actual keyword that invoked us.
430: # $tail - the tail of the request that invoked us.
431: # $replyfd- File descriptor connected to the client
432: # Implicit Inputs:
433: # $currenthostid - Global variable that carries the name of the host
434: # known as.
435: # $clientname - Global variable that carries the name of the hsot we're connected to.
436: # Returns:
437: # 1 - Ok to continue processing.
438: # 0 - Program should exit.
439: # Implicit Outputs:
440: # Reply information is sent to the client.
441: # $cipher is set with a reference to a new IDEA encryption object.
442: #
443: sub EstablishKeyHandler {
1.178.2.4 albertel 444: my $cmd = shift;
445: my $tail = shift;
446: my $replyfd = shift;
447:
448: my $buildkey=time.$$.int(rand 100000);
449: $buildkey=~tr/1-6/A-F/;
450: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
451: my $key=$currenthostid.$clientname;
452: $key=~tr/a-z/A-Z/;
453: $key=~tr/G-P/0-9/;
454: $key=~tr/Q-Z/0-9/;
455: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
456: $key=substr($key,0,32);
457: my $cipherkey=pack("H32",$key);
458: $cipher=new IDEA $cipherkey;
459: Reply($replyfd, "$buildkey\n", "$cmd:$tail");
1.178.2.1 foxr 460:
1.178.2.4 albertel 461: return 1;
1.178.2.1 foxr 462:
463: }
464: RegisterHandler("ekey", \&EstablishKeyHandler, 0, 1,1);
465:
466: # LoadHandler:
467: # Handler for the load command. Returns the current system load average
468: # to the requestor.
469: #
470: # Parameters:
471: # $cmd - the actual keyword that invoked us.
472: # $tail - the tail of the request that invoked us.
473: # $replyfd- File descriptor connected to the client
474: # Implicit Inputs:
475: # $currenthostid - Global variable that carries the name of the host
476: # known as.
477: # $clientname - Global variable that carries the name of the hsot we're connected to.
478: # Returns:
479: # 1 - Ok to continue processing.
480: # 0 - Program should exit.
481: # Side effects:
482: # Reply information is sent to the client.
483: sub LoadHandler {
1.178.2.4 albertel 484: my $cmd = shift;
485: my $tail = shift;
486: my $replyfd = shift;
1.178.2.1 foxr 487:
488: # Get the load average from /proc/loadavg and calculate it as a percentage of
489: # the allowed load limit as set by the perl global variable lonLoadLim
490:
1.178.2.4 albertel 491: my $loadavg;
492: my $loadfile=IO::File->new('/proc/loadavg');
1.178.2.1 foxr 493:
1.178.2.4 albertel 494: $loadavg=<$loadfile>;
495: $loadavg =~ s/\s.*//g; # Extract the first field only.
1.178.2.1 foxr 496:
1.178.2.4 albertel 497: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1.178.2.1 foxr 498:
1.178.2.4 albertel 499: Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
1.178.2.1 foxr 500:
1.178.2.4 albertel 501: return 1;
1.178.2.1 foxr 502: }
503: RegisterHandler("load", \&LoadHandler, 0, 1, 0);
504:
505:
506: #
507: # Process the userload request. This sub returns to the client the current
508: # user load average. It can be invoked either by clients or managers.
509: #
510: # Parameters:
511: # $cmd - the actual keyword that invoked us.
512: # $tail - the tail of the request that invoked us.
513: # $replyfd- File descriptor connected to the client
514: # Implicit Inputs:
515: # $currenthostid - Global variable that carries the name of the host
516: # known as.
517: # $clientname - Global variable that carries the name of the hsot we're connected to.
518: # Returns:
519: # 1 - Ok to continue processing.
520: # 0 - Program should exit
521: # Implicit inputs:
522: # whatever the userload() function requires.
523: # Implicit outputs:
524: # the reply is written to the client.
525: #
526: sub UserLoadHandler {
1.178.2.4 albertel 527: my $cmd = shift;
528: my $tail = shift;
529: my $replyfd = shift;
1.178.2.1 foxr 530:
1.178.2.4 albertel 531: my $userloadpercent=&userload();
532: Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
533:
534: return 1;
1.178.2.1 foxr 535: }
536: RegisterHandler("userload", \&UserLoadHandler, 0, 1, 0);
537:
538: # Process a request for the authorization type of a user:
539: # (userauth).
540: #
541: # Parameters:
542: # $cmd - the actual keyword that invoked us.
543: # $tail - the tail of the request that invoked us.
544: # $replyfd- File descriptor connected to the client
545: # Returns:
546: # 1 - Ok to continue processing.
547: # 0 - Program should exit
548: # Implicit outputs:
549: # The user authorization type is written to the client.
550: #
551: sub UserAuthorizationType {
1.178.2.4 albertel 552: my $cmd = shift;
553: my $tail = shift;
554: my $replyfd = shift;
555:
556: my $userinput = "$cmd:$tail";
557:
558: # Pull the domain and username out of the command tail.
559: # and call GetAuthType to determine the authentication type.
560:
561: my ($udom,$uname)=split(/:/,$tail);
562: my $result = GetAuthType($udom, $uname);
563: if($result eq "nouser") {
564: Failure( $replyfd, "unknown_user\n", $userinput);
565: } else {
1.178.2.8 foxr 566: #
567: # We only want to pass the second field from GetAuthType
568: # for ^krb.. otherwise we'll be handing out the encrypted
569: # password for internals e.g.
570: #
571: my ($type,$otherinfo) = split(/:/,$result);
572: if($type =~ /^krb/) {
573: $type = $result;
574: }
575: Reply( $replyfd, "$type\n", $userinput);
1.178.2.4 albertel 576: }
1.178.2.1 foxr 577:
1.178.2.4 albertel 578: return 1;
1.178.2.1 foxr 579: }
580: RegisterHandler("currentauth", \&UserAuthorizationType, 1, 1, 0);
581: #
582: # Process a request by a manager to push a hosts or domain table
583: # to us. We pick apart the command and pass it on to the subs
584: # that already exist to do this.
585: #
586: # Parameters:
587: # $cmd - the actual keyword that invoked us.
588: # $tail - the tail of the request that invoked us.
589: # $client - File descriptor connected to the client
590: # Returns:
591: # 1 - Ok to continue processing.
592: # 0 - Program should exit
593: # Implicit Output:
594: # a reply is written to the client.
595:
596: sub PushFileHandler {
1.178.2.4 albertel 597: my $cmd = shift;
598: my $tail = shift;
599: my $client = shift;
1.178.2.1 foxr 600:
1.178.2.4 albertel 601: my $userinput = "$cmd:$tail";
1.178.2.1 foxr 602:
1.178.2.4 albertel 603: # At this time we only know that the IP of our partner is a valid manager
604: # the code below is a hook to do further authentication (e.g. to resolve
605: # spoofing).
1.178.2.1 foxr 606:
1.178.2.4 albertel 607: my $cert = GetCertificate($userinput);
608: if(ValidManager($cert)) {
1.178.2.1 foxr 609:
1.178.2.4 albertel 610: # Now presumably we have the bona fides of both the peer host and the
611: # process making the request.
1.178.2.1 foxr 612:
1.178.2.4 albertel 613: my $reply = PushFile($userinput);
614: Reply($client, "$reply\n", $userinput);
1.178.2.1 foxr 615:
1.178.2.4 albertel 616: } else {
617: Failure( $client, "refused\n", $userinput);
618: }
1.178.2.1 foxr 619: }
620: RegisterHandler("pushfile", \&PushFileHandler, 1, 0, 1);
621:
622:
623:
624: # Process a reinit request. Reinit requests that either
625: # lonc or lond be reinitialized so that an updated
626: # host.tab or domain.tab can be processed.
627: #
628: # Parameters:
629: # $cmd - the actual keyword that invoked us.
630: # $tail - the tail of the request that invoked us.
631: # $client - File descriptor connected to the client
632: # Returns:
633: # 1 - Ok to continue processing.
634: # 0 - Program should exit
635: # Implicit output:
636: # a reply is sent to the client.
637: #
638: sub ReinitProcessHandler {
1.178.2.4 albertel 639: my $cmd = shift;
640: my $tail = shift;
641: my $client = shift;
642:
643: my $userinput = "$cmd:$tail";
644:
645: my $cert = GetCertificate($userinput);
646: if(ValidManager($cert)) {
647: chomp($userinput);
648: my $reply = ReinitProcess($userinput);
649: Reply( $client, "$reply\n", $userinput);
650: } else {
651: Failure( $client, "refused\n", $userinput);
652: }
653: return 1;
1.178.2.1 foxr 654: }
655:
656: RegisterHandler("reinit", \&ReinitProcessHandler, 1, 0, 1);
657:
658: # Process the editing script for a table edit operation.
659: # the editing operation must be encrypted and requested by
660: # a manager host.
661: #
662: # Parameters:
663: # $cmd - the actual keyword that invoked us.
664: # $tail - the tail of the request that invoked us.
665: # $client - File descriptor connected to the client
666: # Returns:
667: # 1 - Ok to continue processing.
668: # 0 - Program should exit
669: # Implicit output:
670: # a reply is sent to the client.
671: #
672: sub EditTableHandler {
1.178.2.4 albertel 673: my $command = shift;
674: my $tail = shift;
675: my $client = shift;
676:
677: my $userinput = "$command:$tail";
678:
679: my $cert = GetCertificate($userinput);
680: if(ValidManager($cert)) {
681: my($filetype, $script) = split(/:/, $tail);
682: if (($filetype eq "hosts") ||
683: ($filetype eq "domain")) {
684: if($script ne "") {
685: Reply($client, # BUGBUG - EditFile
686: EditFile($userinput), # could fail.
687: $userinput);
688: } else {
689: Failure($client,"refused\n",$userinput);
690: }
691: } else {
692: Failure($client,"refused\n",$userinput);
693: }
694: } else {
695: Failure($client,"refused\n",$userinput);
696: }
697: return 1;
1.178.2.1 foxr 698: }
699: RegisterHandler("edit", \&EditTableHandler, 1, 0, 1);
700:
701:
702: #
703: # Authenticate a user against the LonCAPA authentication
704: # database. Note that there are several authentication
705: # possibilities:
706: # - unix - The user can be authenticated against the unix
707: # password file.
708: # - internal - The user can be authenticated against a purely
709: # internal per user password file.
710: # - kerberos - The user can be authenticated against either a kerb4 or kerb5
711: # ticket granting authority.
1.178.2.4 albertel 712: # - user - The person tailoring LonCAPA can supply a user authentication
713: # mechanism that is per system.
1.178.2.1 foxr 714: #
715: # Parameters:
716: # $cmd - The command that got us here.
717: # $tail - Tail of the command (remaining parameters).
718: # $client - File descriptor connected to client.
719: # Returns
720: # 0 - Requested to exit, caller should shut down.
721: # 1 - Continue processing.
722: # Implicit inputs:
723: # The authentication systems describe above have their own forms of implicit
724: # input into the authentication process that are described above.
725: #
726: sub AuthenticateHandler {
1.178.2.4 albertel 727: my $cmd = shift;
728: my $tail = shift;
729: my $client = shift;
1.178.2.10 foxr 730:
1.178.2.4 albertel 731: # Regenerate the full input line
1.178.2.10 foxr 732:
1.178.2.4 albertel 733: my $userinput = $cmd.":".$tail;
1.178.2.10 foxr 734:
1.178.2.4 albertel 735: # udom - User's domain.
736: # uname - Username.
737: # upass - User's password.
1.178.2.10 foxr 738:
1.178.2.4 albertel 739: my ($udom,$uname,$upass)=split(/:/,$tail);
740: Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
741: chomp($upass);
742: $upass=unescape($upass);
743:
1.178.2.13 foxr 744: my $pwdcorrect = ValidateUser($udom, $uname, $upass);
745: if($pwdcorrect) {
746: Reply( $client, "authorized\n", $userinput);
1.178.2.4 albertel 747: #
1.178.2.13 foxr 748: # Bad credentials: Failed to authorize
1.178.2.4 albertel 749: #
750: } else {
1.178.2.8 foxr 751: Failure( $client, "non_authorized\n", $userinput);
1.178.2.4 albertel 752: }
1.178.2.13 foxr 753:
1.178.2.4 albertel 754: return 1;
1.178.2.1 foxr 755: }
756: RegisterHandler("auth", \&AuthenticateHandler, 1, 1, 0);
757:
758: #
759: # Change a user's password. Note that this function is complicated by
760: # the fact that a user may be authenticated in more than one way:
761: # At present, we are not able to change the password for all types of
762: # authentication methods. Only for:
763: # unix - unix password or shadow passoword style authentication.
764: # local - Locally written authentication mechanism.
765: # For now, kerb4 and kerb5 password changes are not supported and result
766: # in an error.
767: # FUTURE WORK:
768: # Support kerberos passwd changes?
769: # Parameters:
770: # $cmd - The command that got us here.
771: # $tail - Tail of the command (remaining parameters).
772: # $client - File descriptor connected to client.
773: # Returns
774: # 0 - Requested to exit, caller should shut down.
775: # 1 - Continue processing.
776: # Implicit inputs:
777: # The authentication systems describe above have their own forms of implicit
778: # input into the authentication process that are described above.
779: sub ChangePasswordHandler {
1.178.2.4 albertel 780: my $cmd = shift;
781: my $tail = shift;
782: my $client = shift;
783:
784: my $userinput = $cmd.":".$tail; # Reconstruct client's string.
785:
786: #
787: # udom - user's domain.
788: # uname - Username.
789: # upass - Current password.
790: # npass - New password.
791:
792: my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
1.178.2.22 foxr 793:
1.178.2.4 albertel 794: $upass=&unescape($upass);
795: $npass=&unescape($npass);
796: &Debug("Trying to change password for $uname");
1.178.2.13 foxr 797:
798: # First require that the user can be authenticated with their
799: # old password:
800:
1.178.2.15 foxr 801: my $validated = ValidateUser($udom, $uname, $upass);
1.178.2.13 foxr 802: if($validated) {
803: my $realpasswd = GetAuthType($udom, $uname); # Defined since authd.
804:
1.178.2.4 albertel 805: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
806: if ($howpwd eq 'internal') {
807: &Debug("internal auth");
1.178.2.13 foxr 808: my $salt=time;
809: $salt=substr($salt,6,2);
810: my $ncpass=crypt($npass,$salt);
811: if(RewritePwFile($udom, $uname, "internal:$ncpass")) {
812: &logthis("Result of password change for "
813: ."$uname: pwchange_success");
814: Reply($client, "ok\n", $userinput);
1.178.2.4 albertel 815: } else {
1.178.2.13 foxr 816: &logthis("Unable to open $uname passwd "
817: ."to change password");
818: Failure( $client, "non_authorized\n",$userinput);
1.178.2.4 albertel 819: }
820: } elsif ($howpwd eq 'unix') {
821: # Unix means we have to access /etc/password
822: &Debug("auth is unix");
1.178.2.13 foxr 823: my $execdir=$perlvar{'lonDaemons'};
824: &Debug("Opening lcpasswd pipeline");
825: my $pf = IO::File->new("|$execdir/lcpasswd > "
826: ."$perlvar{'lonDaemons'}"
827: ."/logs/lcpasswd.log");
828: print $pf "$uname\n$npass\n$npass\n";
829: close $pf;
830: my $err = $?;
831: my $result = ($err>0 ? 'pwchange_failure' : 'ok');
832: &logthis("Result of password change for $uname: ".
833: &lcpasswdstrerror($?));
834: Reply($client, "$result\n", $userinput);
1.178.2.4 albertel 835: } else {
1.178.2.8 foxr 836: # this just means that the current password mode is not
837: # one we know how to change (e.g the kerberos auth modes or
838: # locally written auth handler).
839: #
1.178.2.4 albertel 840: Reply( $client, "auth_mode_error\n", $userinput);
841: }
1.178.2.13 foxr 842:
843: }
844: else {
1.178.2.8 foxr 845: Reply( $client, "non_authorized\n", $userinput);
1.178.2.4 albertel 846: }
1.178.2.13 foxr 847:
1.178.2.4 albertel 848: return 1;
1.178.2.1 foxr 849: }
850: RegisterHandler("passwd", \&ChangePasswordHandler, 1, 1, 0);
851:
852: #
853: # Create a new user. User in this case means a lon-capa user.
854: # The user must either already exist in some authentication realm
855: # like kerberos or the /etc/passwd. If not, a user completely local to
856: # this loncapa system is created.
857: #
858: # Parameters:
859: # $cmd - The command that got us here.
860: # $tail - Tail of the command (remaining parameters).
861: # $client - File descriptor connected to client.
862: # Returns
863: # 0 - Requested to exit, caller should shut down.
864: # 1 - Continue processing.
865: # Implicit inputs:
866: # The authentication systems describe above have their own forms of implicit
867: # input into the authentication process that are described above.
868: sub AddUserHandler {
1.178.2.4 albertel 869: my $cmd = shift;
870: my $tail = shift;
871: my $client = shift;
872:
873: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1.178.2.8 foxr 874: my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
875:
1.178.2.4 albertel 876: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
1.178.2.8 foxr 877:
878:
879: if($udom eq $currentdomainid) { # Reject new users for other domains...
880:
881: my $oldumask=umask(0077);
882: chomp($npass);
883: $npass=&unescape($npass);
884: my $passfilename = PasswordPath($udom, $uname);
885: &Debug("Password file created will be:".$passfilename);
886: if (-e $passfilename) {
887: Failure( $client, "already_exists\n", $userinput);
888: } else {
889: my @fpparts=split(/\//,$passfilename);
890: my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
891: my $fperror='';
892: for (my $i=3;$i<= ($#fpparts-1);$i++) {
893: $fpnow.='/'.$fpparts[$i];
894: unless (-e $fpnow) {
1.178.2.14 foxr 895: &logthis("mkdir $fpnow");
1.178.2.8 foxr 896: unless (mkdir($fpnow,0777)) {
897: $fperror="error: ".($!+0)." mkdir failed while attempting "
898: ."makeuser";
899: }
1.178.2.4 albertel 900: }
901: }
1.178.2.8 foxr 902: unless ($fperror) {
903: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
904: Reply($client, $result, $userinput); #BUGBUG - could be fail
905: } else {
906: Failure($client, "$fperror\n", $userinput);
907: }
1.178.2.4 albertel 908: }
1.178.2.8 foxr 909: umask($oldumask);
910: } else {
911: Failure($client, "not_right_domain\n",
912: $userinput); # Even if we are multihomed.
913:
1.178.2.4 albertel 914: }
915: return 1;
1.178.2.1 foxr 916:
917: }
918: RegisterHandler("makeuser", \&AddUserHandler, 1, 1, 0);
919:
920: #
921: # Change the authentication method of a user. Note that this may
922: # also implicitly change the user's password if, for example, the user is
923: # joining an existing authentication realm. Known authentication realms at
924: # this time are:
925: # internal - Purely internal password file (only loncapa knows this user)
926: # local - Institutionally written authentication module.
927: # unix - Unix user (/etc/passwd with or without /etc/shadow).
928: # kerb4 - kerberos version 4
929: # kerb5 - kerberos version 5
930: #
931: # Parameters:
932: # $cmd - The command that got us here.
933: # $tail - Tail of the command (remaining parameters).
934: # $client - File descriptor connected to client.
935: # Returns
936: # 0 - Requested to exit, caller should shut down.
937: # 1 - Continue processing.
938: # Implicit inputs:
939: # The authentication systems describe above have their own forms of implicit
940: # input into the authentication process that are described above.
941: #
942: sub ChangeAuthenticationHandler {
1.178.2.4 albertel 943: my $cmd = shift;
944: my $tail = shift;
945: my $client = shift;
946:
947: my $userinput = "$cmd:$tail"; # Reconstruct user input.
948:
949: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
950: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
951: if ($udom ne $currentdomainid) {
952: Failure( $client, "not_right_domain\n", $client);
953: } else {
1.178.2.8 foxr 954:
955: chomp($npass);
956:
957: $npass=&unescape($npass);
958: my $passfilename = PasswordPath($udom, $uname);
959: if ($passfilename) { # Not allowed to create a new user!!
960: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
961: Reply($client, $result, $userinput);
962: } else {
963: Failure($client, "non_authorized", $userinput); # Fail the user now.
964: }
1.178.2.4 albertel 965: }
966: return 1;
1.178.2.1 foxr 967: }
968: RegisterHandler("changeuserauth", \&ChangeAuthenticationHandler, 1,1, 0);
969:
970: #
971: # Determines if this is the home server for a user. The home server
972: # for a user will have his/her lon-capa passwd file. Therefore all we need
973: # to do is determine if this file exists.
974: #
975: # Parameters:
976: # $cmd - The command that got us here.
977: # $tail - Tail of the command (remaining parameters).
978: # $client - File descriptor connected to client.
979: # Returns
980: # 0 - Requested to exit, caller should shut down.
981: # 1 - Continue processing.
982: # Implicit inputs:
983: # The authentication systems describe above have their own forms of implicit
984: # input into the authentication process that are described above.
985: #
986: sub IsHomeHandler {
1.178.2.4 albertel 987: my $cmd = shift;
988: my $tail = shift;
989: my $client = shift;
990:
991: my $userinput = "$cmd:$tail";
992:
993: my ($udom,$uname)=split(/:/,$tail);
994: chomp($uname);
1.178.2.14 foxr 995: my $passfile = PasswordFilename($udom, $uname);
1.178.2.8 foxr 996: if($passfile) {
1.178.2.4 albertel 997: Reply( $client, "found\n", $userinput);
998: } else {
999: Failure($client, "not_found\n", $userinput);
1000: }
1001: return 1;
1.178.2.1 foxr 1002: }
1003: RegisterHandler("home", \&IsHomeHandler, 0,1,0);
1004: #
1005: # Process an update request for a resource?? I think what's going on here is
1006: # that a resource has been modified that we hold a subscription to.
1007: # If the resource is not local, then we must update, or at least invalidate our
1008: # cached copy of the resource.
1009: # FUTURE WORK:
1010: # I need to look at this logic carefully. My druthers would be to follow
1011: # typical caching logic, and simple invalidate the cache, drop any subscription
1012: # an let the next fetch start the ball rolling again... however that may
1013: # actually be more difficult than it looks given the complex web of
1014: # proxy servers.
1015: # Parameters:
1016: # $cmd - The command that got us here.
1017: # $tail - Tail of the command (remaining parameters).
1018: # $client - File descriptor connected to client.
1019: # Returns
1020: # 0 - Requested to exit, caller should shut down.
1021: # 1 - Continue processing.
1022: # Implicit inputs:
1023: # The authentication systems describe above have their own forms of implicit
1024: # input into the authentication process that are described above.
1025: #
1026: sub UpdateResourceHandler {
1.178.2.4 albertel 1027: my $cmd = shift;
1028: my $tail = shift;
1029: my $client = shift;
1030:
1031: my $userinput = "$cmd:$tail";
1032:
1.178.2.22 foxr 1033: my $fname= $tail; # This allows interactive testing
1034:
1.178.2.20 foxr 1035:
1.178.2.4 albertel 1036: my $ownership=ishome($fname);
1037: if ($ownership eq 'not_owner') {
1038: if (-e $fname) {
1039: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
1040: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
1041: my $now=time;
1042: my $since=$now-$atime;
1043: if ($since>$perlvar{'lonExpire'}) {
1044: my $reply=&reply("unsub:$fname","$clientname");
1045: unlink("$fname");
1046: } else {
1047: my $transname="$fname.in.transfer";
1048: my $remoteurl=&reply("sub:$fname","$clientname");
1049: my $response;
1050: alarm(120);
1051: {
1052: my $ua=new LWP::UserAgent;
1053: my $request=new HTTP::Request('GET',"$remoteurl");
1054: $response=$ua->request($request,$transname);
1055: }
1056: alarm(0);
1057: if ($response->is_error()) {
1058: unlink($transname);
1059: my $message=$response->status_line;
1060: &logthis("LWP GET: $message for $fname ($remoteurl)");
1061: } else {
1062: if ($remoteurl!~/\.meta$/) {
1063: alarm(120);
1064: {
1065: my $ua=new LWP::UserAgent;
1066: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
1067: my $mresponse=$ua->request($mrequest,$fname.'.meta');
1068: if ($mresponse->is_error()) {
1069: unlink($fname.'.meta');
1070: }
1071: }
1072: alarm(0);
1073: }
1074: rename($transname,$fname);
1075: }
1076: }
1077: Reply( $client, "ok\n", $userinput);
1078: } else {
1079: Failure($client, "not_found\n", $userinput);
1080: }
1081: } else {
1082: Failure($client, "rejected\n", $userinput);
1083: }
1084: return 1;
1.178.2.1 foxr 1085: }
1086: RegisterHandler("update", \&UpdateResourceHandler, 0 ,1, 0);
1087:
1088: #
1089: # Fetch a user file from a remote server:
1090: # Parameters:
1091: # $cmd - The command that got us here.
1092: # $tail - Tail of the command (remaining parameters).
1093: # $client - File descriptor connected to client.
1094: # Returns
1095: # 0 - Requested to exit, caller should shut down.
1096: # 1 - Continue processing.
1097: #
1098: sub FetchUserFileHandler {
1.178.2.4 albertel 1099: my $cmd = shift;
1100: my $tail = shift;
1101: my $client = shift;
1102:
1103: my $userinput = "$cmd:$tail";
1104: my $fname = $tail;
1105: my ($udom,$uname,$ufile)=split(/\//,$fname);
1106: my $udir=propath($udom,$uname).'/userfiles';
1107: unless (-e $udir) {
1108: mkdir($udir,0770);
1109: }
1110: if (-e $udir) {
1111: $ufile=~s/^[\.\~]+//;
1112: $ufile=~s/\///g;
1113: my $destname=$udir.'/'.$ufile;
1114: my $transname=$udir.'/'.$ufile.'.in.transit';
1115: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
1116: my $response;
1117: alarm(120);
1118: {
1119: my $ua=new LWP::UserAgent;
1120: my $request=new HTTP::Request('GET',"$remoteurl");
1121: $response=$ua->request($request,$transname);
1122: }
1123: alarm(0);
1124: if ($response->is_error()) {
1125: unlink($transname);
1126: my $message=$response->status_line;
1127: &logthis("LWP GET: $message for $fname ($remoteurl)");
1128: Failure($client, "failed\n", $userinput);
1129: } else {
1130: if (!rename($transname,$destname)) {
1131: &logthis("Unable to move $transname to $destname");
1132: unlink($transname);
1133: Failure($client, "failed\n", $userinput);
1134: } else {
1135: Reply($client, "ok\n", $userinput);
1136: }
1137: }
1138: } else {
1139: Failure($client, "not_home\n", $userinput);
1140: }
1141: return 1;
1.178.2.1 foxr 1142: }
1143: RegisterHandler("fetchuserfile", \&FetchUserFileHandler, 0, 1, 0);
1144: #
1.178.2.16 foxr 1145: # Authenticate access to a user file.
1.178.2.1 foxr 1146: #
1147: # Parameters:
1148: # $cmd - The command that got us here.
1149: # $tail - Tail of the command (remaining parameters).
1150: # $client - File descriptor connected to client.
1151: # Returns
1152: # 0 - Requested to exit, caller should shut down.
1153: # 1 - Continue processing.
1154: sub AuthenticateUserFileAccess {
1.178.2.8 foxr 1155: my $cmd = shift;
1156: my $tail = shift;
1157: my $client = shift;
1.178.2.4 albertel 1158: my $userinput = "$cmd:$tail";
1159:
1160: my ($fname,$session)=split(/:/,$tail);
1161: chomp($session);
1162: my $reply='non_auth';
1163: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.$session.'.id')) {
1164: while (my $line=<ENVIN>) {
1165: if ($line=~/userfile\.$fname\=/) {
1166: $reply='ok';
1167: }
1168: }
1169: close(ENVIN);
1170: Reply($client, $reply."\n", $userinput);
1171: } else {
1172: Failure($client, "invalid_token\n", $userinput);
1173: }
1174: return 1;
1.178.2.1 foxr 1175:
1176: }
1177: RegisterHandler("tokenauthuserfile", \&AuthenticateUserFileAccess, 0, 1, 0);
1178: #
1179: # Unsubscribe from a resource.
1180: #
1181: # Parameters:
1182: # $cmd - The command that got us here.
1183: # $tail - Tail of the command (remaining parameters).
1184: # $client - File descriptor connected to client.
1185: # Returns
1186: # 0 - Requested to exit, caller should shut down.
1187: # 1 - Continue processing.
1188: #
1189: sub UnsubscribeHandler {
1.178.2.4 albertel 1190: my $cmd = shift;
1191: my $tail = shift;
1192: my $client = shift;
1193: my $userinput= "$cmd:$tail";
1194:
1.178.2.22 foxr 1195: my ($fname) = $tail;
1196:
1.178.2.20 foxr 1197: Debug("Unsubscribing $fname");
1.178.2.4 albertel 1198: if (-e $fname) {
1.178.2.20 foxr 1199: Debug("Exists");
1200: Reply($client, &unsub($fname,$clientip), $userinput);
1.178.2.4 albertel 1201: } else {
1202: Failure($client, "not_found\n", $userinput);
1203: }
1204: return 1;
1.178.2.1 foxr 1205: }
1.178.2.20 foxr 1206: RegisterHandler("unsub", \&UnsubscribeHandler, 0, 1, 0);
1.178.2.1 foxr 1207:
1.178.2.13 foxr 1208: # Subscribe to a resource
1.178.2.1 foxr 1209: #
1210: # Parameters:
1211: # $cmd - The command that got us here.
1212: # $tail - Tail of the command (remaining parameters).
1213: # $client - File descriptor connected to client.
1214: # Returns
1215: # 0 - Requested to exit, caller should shut down.
1216: # 1 - Continue processing.
1217: #
1218: sub SubscribeHandler {
1.178.2.4 albertel 1219: my $cmd = shift;
1220: my $tail = shift;
1221: my $client = shift;
1222: my $userinput = "$cmd:$tail";
1.178.2.1 foxr 1223:
1.178.2.4 albertel 1224: Reply( $client, &subscribe($userinput,$clientip), $userinput);
1225:
1226: return 1;
1.178.2.1 foxr 1227: }
1228: RegisterHandler("sub", \&SubscribeHandler, 0, 1, 0);
1229:
1230: #
1231: # Determine the version of a resource (?) Or is it return
1232: # the top version of the resource? Not yet clear from the
1233: # code in currentversion.
1234: #
1235: # Parameters:
1236: # $cmd - The command that got us here.
1237: # $tail - Tail of the command (remaining parameters).
1238: # $client - File descriptor connected to client.
1239: # Returns
1240: # 0 - Requested to exit, caller should shut down.
1241: # 1 - Continue processing.
1242: #
1243: sub CurrentVersionHandler {
1.178.2.4 albertel 1244: my $cmd = shift;
1245: my $tail = shift;
1246: my $client = shift;
1247: my $userinput= "$cmd:$tail";
1248:
1249: my $fname = $tail;
1250: Reply( $client, ¤tversion($fname)."\n", $userinput);
1251: return 1;
1.178.2.1 foxr 1252:
1253: }
1254: RegisterHandler("currentversion", \&CurrentVersionHandler, 0, 1, 0);
1255:
1256:
1257: # Make an entry in a user's activity log.
1258: #
1259: # Parameters:
1260: # $cmd - The command that got us here.
1261: # $tail - Tail of the command (remaining parameters).
1262: # $client - File descriptor connected to client.
1263: # Returns
1264: # 0 - Requested to exit, caller should shut down.
1265: # 1 - Continue processing.
1266: #
1267: sub ActivityLogEntryHandler {
1.178.2.4 albertel 1268: my $cmd = shift;
1269: my $tail = shift;
1270: my $client = shift;
1271: my $userinput= "$cmd:$tail";
1272:
1273: my ($udom,$uname,$what)=split(/:/,$tail);
1274: chomp($what);
1275: my $proname=propath($udom,$uname);
1276: my $now=time;
1277: my $hfh;
1278: if ($hfh=IO::File->new(">>$proname/activity.log")) {
1279: print $hfh "$now:$clientname:$what\n";
1280: Reply( $client, "ok\n", $userinput);
1281: } else {
1.178.2.8 foxr 1282: Failure($client, "error: ".($!+0)." IO::File->new Failed "
1.178.2.4 albertel 1283: ."while attempting log\n",
1284: $userinput);
1285: }
1.178.2.1 foxr 1286:
1.178.2.4 albertel 1287: return 1;
1.178.2.1 foxr 1288: }
1289: RegisterHandler("log", \&ActivityLogEntryHandler, 0, 1, 0);
1290: #
1291: # Put a namespace entry in a user profile hash.
1292: # My druthers would be for this to be an encrypted interaction too.
1293: # anything that might be an inadvertent covert channel about either
1294: # user authentication or user personal information....
1295: #
1296: # Parameters:
1297: # $cmd - The command that got us here.
1298: # $tail - Tail of the command (remaining parameters).
1299: # $client - File descriptor connected to client.
1300: # Returns
1301: # 0 - Requested to exit, caller should shut down.
1302: # 1 - Continue processing.
1303: #
1304: sub PutUserProfileEntry {
1.178.2.4 albertel 1305: my $cmd = shift;
1306: my $tail = shift;
1307: my $client = shift;
1308: my $userinput = "$cmd:$tail";
1.178.2.10 foxr 1309:
1.178.2.4 albertel 1310: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
1311: if ($namespace ne 'roles') {
1.178.2.10 foxr 1312: chomp($what);
1313: my $hashref = TieUserHash($udom, $uname, $namespace,
1314: &GDBM_WRCREAT(),"P",$what);
1315: if($hashref) {
1316: my @pairs=split(/\&/,$what);
1317: foreach my $pair (@pairs) {
1318: my ($key,$value)=split(/=/,$pair);
1319: $hashref->{$key}=$value;
1320: }
1321: if (untie(%$hashref)) {
1322: Reply( $client, "ok\n", $userinput);
1323: } else {
1324: Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
1325: "while attempting put\n",
1326: $userinput);
1327: }
1328: } else {
1329: Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
1330: "while attempting put\n", $userinput);
1331: }
1332: } else {
1.178.2.8 foxr 1333: Failure( $client, "refused\n", $userinput);
1.178.2.10 foxr 1334: }
1.178.2.8 foxr 1335:
1.178.2.10 foxr 1336: return 1;
1.178.2.1 foxr 1337: }
1338: RegisterHandler("put", \&PutUserProfileEntry, 0, 1, 0);
1339:
1340: #
1341: # Increment a profile entry in the user history file.
1342: # The history contains keyword value pairs. In this case,
1343: # The value itself is a pair of numbers. The first, the current value
1344: # the second an increment that this function applies to the current
1345: # value.
1346: #
1347: # Parameters:
1348: # $cmd - The command that got us here.
1349: # $tail - Tail of the command (remaining parameters).
1350: # $client - File descriptor connected to client.
1351: # Returns
1352: # 0 - Requested to exit, caller should shut down.
1353: # 1 - Continue processing.
1354: #
1355: sub IncrementUserValueHandler {
1.178.2.4 albertel 1356: my $cmd = shift;
1357: my $tail = shift;
1358: my $client = shift;
1.178.2.7 foxr 1359: my $userinput = "$cmd:$tail";
1.178.2.4 albertel 1360:
1361: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
1362: if ($namespace ne 'roles') {
1.178.2.8 foxr 1363: chomp($what);
1.178.2.9 foxr 1364: my $hashref = TieUserHash($udom, $uname,
1.178.2.10 foxr 1365: $namespace, &GDBM_WRCREAT(),
1366: "P",$what);
1.178.2.8 foxr 1367: if ($hashref) {
1.178.2.10 foxr 1368: my @pairs=split(/\&/,$what);
1369: foreach my $pair (@pairs) {
1370: my ($key,$value)=split(/=/,$pair);
1371: # We could check that we have a number...
1372: if (! defined($value) || $value eq '') {
1373: $value = 1;
1374: }
1375: $hashref->{$key}+=$value;
1376: }
1377: if (untie(%$hashref)) {
1378: Reply( $client, "ok\n", $userinput);
1379: } else {
1380: Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
1381: "while attempting inc\n", $userinput);
1382: }
1383: } else {
1384: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
1385: "while attempting inc\n", $userinput);
1386: }
1387: } else {
1388: Failure($client, "refused\n", $userinput);
1389: }
1.178.2.8 foxr 1390:
1.178.2.4 albertel 1391: return 1;
1.178.2.1 foxr 1392: }
1393: RegisterHandler("inc", \&IncrementUserValueHandler, 0, 1, 0);
1394: #
1395: # Put a new role for a user. Roles are LonCAPA's packaging of permissions.
1396: # Each 'role' a user has implies a set of permissions. Adding a new role
1397: # for a person grants the permissions packaged with that role
1398: # to that user when the role is selected.
1399: #
1400: # Parameters:
1401: # $cmd - The command string (rolesput).
1402: # $tail - The remainder of the request line. For rolesput this
1403: # consists of a colon separated list that contains:
1404: # The domain and user that is granting the role (logged).
1405: # The domain and user that is getting the role.
1406: # The roles being granted as a set of & separated pairs.
1407: # each pair a key value pair.
1408: # $client - File descriptor connected to the client.
1409: # Returns:
1410: # 0 - If the daemon should exit
1411: # 1 - To continue processing.
1412: #
1413: #
1414: sub RolesPutHandler {
1.178.2.4 albertel 1415: my $cmd = shift;
1416: my $tail = shift;
1417: my $client = shift;
1418: my $userinput = "$cmd:$tail";
1419:
1.178.2.19 foxr 1420: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail);
1421:
1422:
1.178.2.4 albertel 1423: my $namespace='roles';
1424: chomp($what);
1.178.2.9 foxr 1425: my $hashref = TieUserHash($udom, $uname, $namespace,
1.178.2.10 foxr 1426: &GDBM_WRCREAT(), "P",
1427: "$exedom:$exeuser:$what");
1.178.2.4 albertel 1428: #
1429: # Log the attempt to set a role. The {}'s here ensure that the file
1430: # handle is open for the minimal amount of time. Since the flush
1431: # is done on close this improves the chances the log will be an un-
1432: # corrupted ordered thing.
1.178.2.8 foxr 1433: if ($hashref) {
1434: my @pairs=split(/\&/,$what);
1.178.2.4 albertel 1435: foreach my $pair (@pairs) {
1436: my ($key,$value)=split(/=/,$pair);
1.178.2.8 foxr 1437: &ManagePermissions($key, $udom, $uname,
1438: &GetAuthType( $udom, $uname));
1439: $hashref->{$key}=$value;
1.178.2.4 albertel 1440: }
1.178.2.8 foxr 1441: if (untie($hashref)) {
1.178.2.4 albertel 1442: Reply($client, "ok\n", $userinput);
1443: } else {
1444: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
1445: "while attempting rolesput\n", $userinput);
1446: }
1447: } else {
1448: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1449: "while attempting rolesput\n", $userinput);
1450: }
1451: return 1;
1.178.2.1 foxr 1452: }
1453: RegisterHandler("rolesput", \&RolesPutHandler, 1,1,0); # Encoded client only.
1454: #
1455: # Deletes (removes) a role for a user. This is equivalent to removing
1456: # a permissions package associated with the role from the user's profile.
1457: #
1458: # Parameters:
1459: # $cmd - The command (rolesdel)
1460: # $tail - The remainder of the request line. This consists
1461: # of:
1462: # The domain and user requesting the change (logged)
1463: # The domain and user being changed.
1464: # The roles being revoked. These are shipped to us
1465: # as a bunch of & separated role name keywords.
1466: # $client - The file handle open on the client.
1467: # Returns:
1468: # 1 - Continue processing
1469: # 0 - Exit.
1470: #
1471: sub RolesDeleteHandler {
1.178.2.4 albertel 1472: my $cmd = shift;
1473: my $tail = shift;
1474: my $client = shift;
1475: my $userinput = "$cmd:$tail";
1476:
1477: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
1478: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
1479: "what = ".$what);
1480: my $namespace='roles';
1481: chomp($what);
1.178.2.9 foxr 1482: my $hashref = TieUserHash($udom, $uname, $namespace,
1.178.2.10 foxr 1483: &GDBM_WRCREAT(), "D",
1484: "$exedom:$exeuser:$what");
1485:
1.178.2.8 foxr 1486: if ($hashref) {
1.178.2.10 foxr 1487: my @rolekeys=split(/\&/,$what);
1488:
1489: foreach my $key (@rolekeys) {
1490: delete $hashref->{$key};
1491: }
1492: if (untie(%$hashref)) {
1493: Reply($client, "ok\n", $userinput);
1.178.2.4 albertel 1494: } else {
1.178.2.10 foxr 1495: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
1496: "while attempting rolesdel\n", $userinput);
1.178.2.4 albertel 1497: }
1.178.2.10 foxr 1498: } else {
1.178.2.8 foxr 1499: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1.178.2.4 albertel 1500: "while attempting rolesdel\n", $userinput);
1.178.2.10 foxr 1501: }
1.178.2.4 albertel 1502:
1503: return 1;
1.178.2.1 foxr 1504: }
1505: RegisterHandler("rolesdel", \&RolesDeleteHandler, 1,1, 0); # Encoded client only
1506:
1507: # Unencrypted get from a user's profile database. See
1508: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
1509: # This function retrieves a keyed item from a specific named database in the
1510: # user's directory.
1511: #
1512: # Parameters:
1513: # $cmd - Command request keyword (get).
1514: # $tail - Tail of the command. This is a colon separated list
1515: # consisting of the domain and username that uniquely
1516: # identifies the profile,
1517: # The 'namespace' which selects the gdbm file to
1518: # do the lookup in,
1519: # & separated list of keys to lookup. Note that
1520: # the values are returned as an & separated list too.
1521: # $client - File descriptor open on the client.
1522: # Returns:
1523: # 1 - Continue processing.
1524: # 0 - Exit.
1525: #
1526: sub GetProfileEntry {
1.178.2.4 albertel 1527: my $cmd = shift;
1528: my $tail = shift;
1529: my $client = shift;
1530: my $userinput= "$cmd:$tail";
1531:
1532: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
1533: chomp($what);
1.178.2.9 foxr 1534: my $hashref = TieUserHash($udom, $uname, $namespace,
1.178.2.10 foxr 1535: &GDBM_READER());
1.178.2.8 foxr 1536: if ($hashref) {
1537: my @queries=split(/\&/,$what);
1538: my $qresult='';
1.178.2.10 foxr 1539:
1.178.2.4 albertel 1540: for (my $i=0;$i<=$#queries;$i++) {
1.178.2.8 foxr 1541: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string.
1.178.2.4 albertel 1542: }
1.178.2.8 foxr 1543: $qresult=~s/\&$//; # Remove trailing & from last lookup.
1544: if (untie(%$hashref)) {
1.178.2.4 albertel 1545: Reply($client, "$qresult\n", $userinput);
1546: } else {
1547: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
1548: "while attempting get\n", $userinput);
1549: }
1550: } else {
1551: if ($!+0 == 2) { # +0 coerces errno -> number 2 is ENOENT
1552: Failure($client, "error:No such file or ".
1553: "GDBM reported bad block error\n", $userinput);
1554: } else { # Some other undifferentiated err.
1555: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
1556: "while attempting get\n", $userinput);
1557: }
1558: }
1559: return 1;
1.178.2.1 foxr 1560: }
1561: RegisterHandler("get", \&GetProfileEntry, 0,1,0);
1562: #
1563: # Process the encrypted get request. Note that the request is sent
1564: # in clear, but the reply is encrypted. This is a small covert channel:
1565: # information about the sensitive keys is given to the snooper. Just not
1566: # information about the values of the sensitive key. Hmm if I wanted to
1567: # know these I'd snoop for the egets. Get the profile item names from them
1568: # and then issue a get for them since there's no enforcement of the
1569: # requirement of an encrypted get for particular profile items. If I
1570: # were re-doing this, I'd force the request to be encrypted as well as the
1571: # reply. I'd also just enforce encrypted transactions for all gets since
1572: # that would prevent any covert channel snooping.
1573: #
1574: # Parameters:
1575: # $cmd - Command keyword of request (eget).
1576: # $tail - Tail of the command. See GetProfileEntry
# for more information about this.
1577: # $client - File open on the client.
1578: # Returns:
1579: # 1 - Continue processing
1580: # 0 - server should exit.
1581: sub GetProfileEntryEncrypted {
1.178.2.4 albertel 1582: my $cmd = shift;
1583: my $tail = shift;
1584: my $client = shift;
1585: my $userinput = "$cmd:$tail";
1586:
1587: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
1588: chomp($what);
1.178.2.9 foxr 1589: my $hashref = TieUserHash($udom, $uname, $namespace,
1.178.2.8 foxr 1590: &GDBM_READER());
1591: if ($hashref) {
1592: my @queries=split(/\&/,$what);
1593: my $qresult='';
1.178.2.4 albertel 1594: for (my $i=0;$i<=$#queries;$i++) {
1.178.2.8 foxr 1595: $qresult.="$hashref->{$queries[$i]}&";
1.178.2.4 albertel 1596: }
1.178.2.8 foxr 1597: if (untie(%$hashref)) {
1.178.2.4 albertel 1598: $qresult=~s/\&$//;
1599: if ($cipher) {
1600: my $cmdlength=length($qresult);
1601: $qresult.=" ";
1602: my $encqresult='';
1603: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
1.178.2.10 foxr 1604: $encqresult.= unpack("H16",
1605: $cipher->encrypt(substr($qresult,
1606: $encidx,
1607: 8)));
1.178.2.4 albertel 1608: }
1609: Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
1610: } else {
1611: Failure( $client, "error:no_key\n", $userinput);
1612: }
1613: } else {
1614: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
1615: "while attempting eget\n", $userinput);
1616: }
1617: } else {
1618: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
1619: "while attempting eget\n", $userinput);
1620: }
1621:
1622: return 1;
1.178.2.1 foxr 1623: }
1.178.2.16 foxr 1624: RegisterHandler("eget", \&GetProfileEntryEncrypted, 0, 1, 0);
1.178.2.1 foxr 1625:
1626: #
1627: # Deletes a key in a user profile database.
1628: #
1629: # Parameters:
1630: # $cmd - Command keyword (del).
1631: # $tail - Command tail. IN this case a colon
1632: # separated list containing:
1633: # The domain and user that identifies uniquely
1634: # the identity of the user.
1635: # The profile namespace (name of the profile
1636: # database file).
1637: # & separated list of keywords to delete.
1638: # $client - File open on client socket.
1639: # Returns:
1640: # 1 - Continue processing
1641: # 0 - Exit server.
1642: #
1643: #
1.178.2.6 foxr 1644:
1645: sub DeleteProfileEntry {
1.178.2.4 albertel 1646: my $cmd = shift;
1647: my $tail = shift;
1648: my $client = shift;
1649: my $userinput = "cmd:$tail";
1650:
1651: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
1652: chomp($what);
1.178.2.9 foxr 1653: my $hashref = TieUserHash($udom, $uname, $namespace,
1.178.2.8 foxr 1654: &GDBM_WRCREAT(),
1655: "D",$what);
1656: if ($hashref) {
1657: my @keys=split(/\&/,$what);
1.178.2.4 albertel 1658: foreach my $key (@keys) {
1.178.2.8 foxr 1659: delete($hashref->{$key});
1.178.2.4 albertel 1660: }
1.178.2.8 foxr 1661: if (untie(%$hashref)) {
1.178.2.4 albertel 1662: Reply($client, "ok\n", $userinput);
1663: } else {
1664: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
1665: "while attempting del\n", $userinput);
1666: }
1667: } else {
1668: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1669: "while attempting del\n", $userinput);
1670: }
1671: return 1;
1.178.2.1 foxr 1672: }
1673: RegisterHandler("del", \&DeleteProfileEntry, 0, 1, 0);
1674: #
1675: # List the set of keys that are defined in a profile database file.
1676: # A successful reply from this will contain an & separated list of
1677: # the keys.
1678: # Parameters:
1679: # $cmd - Command request (keys).
1680: # $tail - Remainder of the request, a colon separated
1681: # list containing domain/user that identifies the
1682: # user being queried, and the database namespace
1683: # (database filename essentially).
1684: # $client - File open on the client.
1685: # Returns:
1686: # 1 - Continue processing.
1687: # 0 - Exit the server.
1688: #
1689: sub GetProfileKeys {
1.178.2.4 albertel 1690: my $cmd = shift;
1691: my $tail = shift;
1692: my $client = shift;
1693: my $userinput = "$cmd:$tail";
1694:
1695: my ($udom,$uname,$namespace)=split(/:/,$tail);
1696: my $qresult='';
1.178.2.9 foxr 1697: my $hashref = TieUserHash($udom, $uname, $namespace,
1.178.2.8 foxr 1698: &GDBM_READER());
1699: if ($hashref) {
1700: foreach my $key (keys %$hashref) {
1.178.2.4 albertel 1701: $qresult.="$key&";
1702: }
1.178.2.8 foxr 1703: if (untie(%$hashref)) {
1.178.2.4 albertel 1704: $qresult=~s/\&$//;
1705: Reply($client, "$qresult\n", $userinput);
1706: } else {
1707: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
1708: "while attempting keys\n", $userinput);
1709: }
1710: } else {
1711: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1712: "while attempting keys\n", $userinput);
1713: }
1.178.2.1 foxr 1714:
1.178.2.4 albertel 1715: return 1;
1.178.2.1 foxr 1716: }
1717: RegisterHandler("keys", \&GetProfileKeys, 0, 1, 0);
1718: #
1719: # Dump the contents of a user profile database.
1720: # Note that this constitutes a very large covert channel too since
1721: # the dump will return sensitive information that is not encrypted.
1722: # The naive security assumption is that the session negotiation ensures
1723: # our client is trusted and I don't believe that's assured at present.
1724: # Sure want badly to go to ssl or tls. Of course if my peer isn't really
1725: # a LonCAPA node they could have negotiated an encryption key too so >sigh<.
1726: #
1727: # Parameters:
1728: # $cmd - The command request keyword (currentdump).
1729: # $tail - Remainder of the request, consisting of a colon
1730: # separated list that has the domain/username and
1731: # the namespace to dump (database file).
1732: # $client - file open on the remote client.
1733: # Returns:
1734: # 1 - Continue processing.
1735: # 0 - Exit the server.
1736: #
1737: sub DumpProfileDatabase {
1.178.2.4 albertel 1738: my $cmd = shift;
1739: my $tail = shift;
1740: my $client = shift;
1741: my $userinput = "$cmd:$tail";
1742:
1743: my ($udom,$uname,$namespace) = split(/:/,$tail);
1.178.2.9 foxr 1744: my $hashref = TieUserHash($udom, $uname, $namespace,
1.178.2.8 foxr 1745: &GDBM_READER());
1746: if ($hashref) {
1.178.2.4 albertel 1747: # Structure of %data:
1748: # $data{$symb}->{$parameter}=$value;
1749: # $data{$symb}->{'v.'.$parameter}=$version;
1750: # since $parameter will be unescaped, we do not
1.178.2.8 foxr 1751: # have to worry about silly parameter names...
1.178.2.10 foxr 1752:
1.178.2.8 foxr 1753: my $qresult='';
1.178.2.4 albertel 1754: my %data = (); # A hash of anonymous hashes..
1.178.2.8 foxr 1755: while (my ($key,$value) = each(%$hashref)) {
1.178.2.4 albertel 1756: my ($v,$symb,$param) = split(/:/,$key);
1757: next if ($v eq 'version' || $symb eq 'keys');
1758: next if (exists($data{$symb}) &&
1759: exists($data{$symb}->{$param}) &&
1760: $data{$symb}->{'v.'.$param} > $v);
1761: $data{$symb}->{$param}=$value;
1762: $data{$symb}->{'v.'.$param}=$v;
1763: }
1.178.2.8 foxr 1764: if (untie(%$hashref)) {
1.178.2.4 albertel 1765: while (my ($symb,$param_hash) = each(%data)) {
1766: while(my ($param,$value) = each (%$param_hash)){
1767: next if ($param =~ /^v\./); # Ignore versions...
1768: #
1769: # Just dump the symb=value pairs separated by &
1770: #
1771: $qresult.=$symb.':'.$param.'='.$value.'&';
1772: }
1773: }
1774: chop($qresult);
1775: Reply($client , "$qresult\n", $userinput);
1776: } else {
1777: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
1778: "while attempting currentdump\n", $userinput);
1779: }
1780: } else {
1781: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
1782: "while attempting currentdump\n", $userinput);
1783: }
1.178.2.1 foxr 1784:
1.178.2.4 albertel 1785: return 1;
1.178.2.1 foxr 1786: }
1787: RegisterHandler("currentdump", \&DumpProfileDatabase, 0, 1, 0);
1788: #
1789: # Dump a profile database with an optional regular expression
1790: # to match against the keys. In this dump, no effort is made
1791: # to separate symb from version information. Presumably the
1792: # databases that are dumped by this command are of a different
1793: # structure. Need to look at this and improve the documentation of
1794: # both this and the currentdump handler.
1795: # Parameters:
1796: # $cmd - The command keyword.
1797: # $tail - All of the characters after the $cmd:
1798: # These are expected to be a colon
1799: # separated list containing:
1800: # domain/user - identifying the user.
1801: # namespace - identifying the database.
1802: # regexp - optional regular expression
1803: # that is matched against
1804: # database keywords to do
1805: # selective dumps.
1806: # $client - Channel open on the client.
1807: # Returns:
1808: # 1 - Continue processing.
1809: # Side effects:
1810: # response is written to $client.
1811: #
1812: sub DumpWithRegexp {
1.178.2.4 albertel 1813: my $cmd = shift;
1814: my $tail = shift;
1815: my $client = shift;
1816:
1817: my $userinput = "$cmd:$tail";
1818:
1819: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
1820: if (defined($regexp)) {
1821: $regexp=&unescape($regexp);
1822: } else {
1823: $regexp='.';
1824: }
1.178.2.9 foxr 1825: my $hashref =TieUserHash($udom, $uname, $namespace,
1.178.2.8 foxr 1826: &GDBM_READER());
1827: if ($hashref) {
1828: my $qresult='';
1829: while (my ($key,$value) = each(%$hashref)) {
1.178.2.4 albertel 1830: if ($regexp eq '.') {
1831: $qresult.=$key.'='.$value.'&';
1832: } else {
1833: my $unescapeKey = &unescape($key);
1834: if (eval('$unescapeKey=~/$regexp/')) {
1835: $qresult.="$key=$value&";
1836: }
1837: }
1838: }
1.178.2.8 foxr 1839: if (untie(%$hashref)) {
1.178.2.4 albertel 1840: chop($qresult);
1841: Reply($client, "$qresult\n", $userinput);
1842: } else {
1843: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
1844: "while attempting dump\n", $userinput);
1845: }
1846: } else {
1847: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
1848: "while attempting dump\n", $userinput);
1849: }
1.178.2.1 foxr 1850:
1851: return 1;
1852: }
1853: RegisterHandler("dump", \&DumpWithRegexp, 0, 1, 0);
1854:
1.178.2.22 foxr 1855: # Store a set of key=value pairs associated with a versioned name.
1.178.2.1 foxr 1856: #
1857: # Parameters:
1858: # $cmd - Request command keyword.
1859: # $tail - Tail of the request. This is a colon
1860: # separated list containing:
1861: # domain/user - User and authentication domain.
1862: # namespace - Name of the database being modified
1863: # rid - Resource keyword to modify.
1864: # what - new value associated with rid.
1865: #
1866: # $client - Socket open on the client.
1867: #
1868: #
1869: # Returns:
1870: # 1 (keep on processing).
1871: # Side-Effects:
1872: # Writes to the client
1873: sub StoreHandler {
1.178.2.4 albertel 1874: my $cmd = shift;
1875: my $tail = shift;
1876: my $client = shift;
1.178.2.1 foxr 1877:
1.178.2.4 albertel 1878: my $userinput = "$cmd:$tail";
1.178.2.1 foxr 1879:
1.178.2.4 albertel 1880: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
1881: if ($namespace ne 'roles') {
1.178.2.8 foxr 1882:
1.178.2.4 albertel 1883: chomp($what);
1884: my @pairs=split(/\&/,$what);
1.178.2.9 foxr 1885: my $hashref = TieUserHash($udom, $uname, $namespace,
1.178.2.8 foxr 1886: &GDBM_WRCREAT(), "P",
1887: "$rid:$what");
1888: if ($hashref) {
1889: my $now = time;
1890: my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
1.178.2.4 albertel 1891: my $key;
1.178.2.8 foxr 1892: $hashref->{"version:$rid"}++;
1893: my $version=$hashref->{"version:$rid"};
1.178.2.4 albertel 1894: my $allkeys='';
1895: foreach my $pair (@pairs) {
1896: my ($key,$value)=split(/=/,$pair);
1897: $allkeys.=$key.':';
1.178.2.8 foxr 1898: $hashref->{"$version:$rid:$key"}=$value;
1.178.2.4 albertel 1899: }
1.178.2.8 foxr 1900: $hashref->{"$version:$rid:timestamp"}=$now;
1.178.2.4 albertel 1901: $allkeys.='timestamp';
1.178.2.8 foxr 1902: $hashref->{"$version:keys:$rid"}=$allkeys;
1903: if (untie($hashref)) {
1.178.2.4 albertel 1904: Reply($client, "ok\n", $userinput);
1905: } else {
1906: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
1907: "while attempting store\n", $userinput);
1908: }
1909: } else {
1910: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
1911: "while attempting store\n", $userinput);
1912: }
1913: } else {
1914: Failure($client, "refused\n", $userinput);
1.178.2.1 foxr 1915: }
1916:
1.178.2.4 albertel 1917: return 1;
1.178.2.1 foxr 1918: }
1919: RegisterHandler("store", \&StoreHandler, 0, 1, 0);
1920: #
1.178.2.22 foxr 1921: # Dump out all versions of a resource that has key=value pairs associated
1922: # with it for each version. These resources are built up via the store
1923: # command.
1.178.2.1 foxr 1924: #
1925: # Parameters:
1926: # $cmd - Command keyword.
1927: # $tail - Remainder of the request which consists of:
1928: # domain/user - User and auth. domain.
1929: # namespace - name of resource database.
1930: # rid - Resource id.
1931: # $client - socket open on the client.
1932: #
1933: # Returns:
1934: # 1 indicating the caller should not yet exit.
1935: # Side-effects:
1936: # Writes a reply to the client.
1.178.2.22 foxr 1937: # The reply is a string of the following shape:
1938: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
1939: # Where the 1 above represents version 1.
1940: # this continues for all pairs of keys in all versions.
1941: #
1942: #
1943: #
1.178.2.1 foxr 1944: #
1945: sub RestoreHandler {
1.178.2.4 albertel 1946: my $cmd = shift;
1947: my $tail = shift;
1948: my $client = shift;
1949:
1950: my $userinput = "$cmd:$tail"; # Only used for logging purposes.
1951:
1952: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
1953: $namespace=~s/\//\_/g;
1954: $namespace=~s/\W//g;
1955: chomp($rid);
1956: my $proname=propath($udom,$uname);
1957: my $qresult='';
1958: my %hash;
1959: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
1960: &GDBM_READER(),0640)) {
1961: my $version=$hash{"version:$rid"};
1962: $qresult.="version=$version&";
1963: my $scope;
1964: for ($scope=1;$scope<=$version;$scope++) {
1965: my $vkeys=$hash{"$scope:keys:$rid"};
1966: my @keys=split(/:/,$vkeys);
1967: my $key;
1968: $qresult.="$scope:keys=$vkeys&";
1969: foreach $key (@keys) {
1970: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
1971: }
1972: }
1973: if (untie(%hash)) {
1974: $qresult=~s/\&$//;
1975: Reply( $client, "$qresult\n", $userinput);
1976: } else {
1977: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
1978: "while attempting restore\n", $userinput);
1979: }
1980: } else {
1981: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
1982: "while attempting restore\n", $userinput);
1983: }
1.178.2.1 foxr 1984:
1.178.2.4 albertel 1985: return 1;
1.178.2.1 foxr 1986:
1987:
1988: }
1.178.2.6 foxr 1989: RegisterHandler("restore", \&RestoreHandler, 0,1,0);
1.178.2.1 foxr 1990:
1991: #
1992: # Add a chat message to to a discussion board.
1993: #
1994: # Parameters:
1995: # $cmd - Request keyword.
1996: # $tail - Tail of the command. A colon separated list
1997: # containing:
1998: # cdom - Domain on which the chat board lives
1999: # cnum - Identifier of the discussion group.
2000: # post - Body of the posting.
2001: # $client - Socket open on the client.
2002: # Returns:
2003: # 1 - Indicating caller should keep on processing.
2004: #
2005: # Side-effects:
2006: # writes a reply to the client.
2007: #
2008: #
2009: sub SendChatHandler {
1.178.2.4 albertel 2010: my $cmd = shift;
2011: my $tail = shift;
2012: my $client = shift;
2013:
2014: my $userinput = "$cmd:$tail";
1.178.2.1 foxr 2015:
1.178.2.4 albertel 2016: my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
2017: &chatadd($cdom,$cnum,$newpost);
2018: Reply($client, "ok\n", $userinput);
1.178.2.1 foxr 2019:
1.178.2.4 albertel 2020: return 1;
1.178.2.1 foxr 2021: }
2022: RegisterHandler("chatsend", \&SendChatHandler, 0, 1, 0);
2023: #
2024: # Retrieve the set of chat messagss from a discussion board.
2025: #
2026: # Parameters:
2027: # $cmd - Command keyword that initiated the request.
2028: # $tail - Remainder of the request after the command
2029: # keyword. In this case a colon separated list of
2030: # chat domain - Which discussion board.
2031: # chat id - Discussion thread(?)
2032: # domain/user - Authentication domain and username
2033: # of the requesting person.
2034: # $client - Socket open on the client program.
2035: # Returns:
2036: # 1 - continue processing
2037: # Side effects:
2038: # Response is written to the client.
2039: #
2040: sub RetrieveChatHandler {
1.178.2.4 albertel 2041: my $cmd = shift;
2042: my $tail = shift;
2043: my $client = shift;
2044:
2045: my $userinput = "$cmd:$tail";
2046:
2047: my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
2048: my $reply='';
2049: foreach (&getchat($cdom,$cnum,$udom,$uname)) {
2050: $reply.=&escape($_).':';
2051: }
2052: $reply=~s/\:$//;
2053: Reply($client, $reply."\n", $userinput);
1.178.2.1 foxr 2054:
2055:
1.178.2.4 albertel 2056: return 1;
1.178.2.1 foxr 2057: }
2058: RegisterHandler("chatretr", \&RetrieveChatHandler, 0, 1, 0);
2059: #
2060: # Initiate a query of an sql database. SQL query repsonses get put in
2061: # a file for later retrieval. This prevents sql query results from
2062: # bottlenecking the system. Note that with loncnew, perhaps this is
2063: # less of an issue since multiple outstanding requests can be concurrently
2064: # serviced.
2065: #
2066: # Parameters:
2067: # $cmd - COmmand keyword that initiated the request.
2068: # $tail - Remainder of the command after the keyword.
2069: # For this function, this consists of a query and
2070: # 3 arguments that are self-documentingly labelled
2071: # in the original arg1, arg2, arg3.
2072: # $client - Socket open on the client.
2073: # Return:
2074: # 1 - Indicating processing should continue.
2075: # Side-effects:
2076: # a reply is written to $client.
2077: #
2078: sub SendQueryHandler {
1.178.2.4 albertel 2079: my $cmd = shift;
2080: my $tail = shift;
2081: my $client = shift;
2082:
2083: my $userinput = "$cmd:$tail";
2084:
2085: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
2086: $query=~s/\n*$//g;
2087: Reply($client, "". sqlreply("$clientname\&$query".
2088: "\&$arg1"."\&$arg2"."\&$arg3")."\n",
2089: $userinput);
2090:
2091: return 1;
1.178.2.1 foxr 2092: }
2093: RegisterHandler("querysend", \&SendQueryHandler, 0, 1, 0);
2094:
2095: #
2096: # Add a reply to an sql query. SQL queries are done asyncrhonously.
2097: # The query is submitted via a "querysend" transaction.
2098: # There it is passed on to the lonsql daemon, queued and issued to
2099: # mysql.
2100: # This transaction is invoked when the sql transaction is complete
2101: # it stores the query results in flie and indicates query completion.
2102: # presumably local software then fetches this response... I'm guessing
2103: # the sequence is: lonc does a querysend, we ask lonsql to do it.
2104: # lonsql on completion of the query interacts with the lond of our
2105: # client to do a query reply storing two files:
2106: # - id - The results of the query.
2107: # - id.end - Indicating the transaction completed.
2108: # NOTE: id is a unique id assigned to the query and querysend time.
2109: # Parameters:
2110: # $cmd - Command keyword that initiated this request.
2111: # $tail - Remainder of the tail. In this case that's a colon
2112: # separated list containing the query Id and the
2113: # results of the query.
2114: # $client - Socket open on the client.
2115: # Return:
2116: # 1 - Indicating that we should continue processing.
2117: # Side effects:
2118: # ok written to the client.
2119: #
2120: sub ReplyQueryHandler {
1.178.2.4 albertel 2121: my $cmd = shift;
2122: my $tail = shift;
2123: my $client = shift;
2124:
2125: my $userinput = "$cmd:$tail";
2126:
2127: my ($cmd,$id,$reply)=split(/:/,$userinput);
2128: my $store;
2129: my $execdir=$perlvar{'lonDaemons'};
2130: if ($store=IO::File->new(">$execdir/tmp/$id")) {
2131: $reply=~s/\&/\n/g;
2132: print $store $reply;
2133: close $store;
2134: my $store2=IO::File->new(">$execdir/tmp/$id.end");
2135: print $store2 "done\n";
2136: close $store2;
2137: Reply($client, "ok\n", $userinput);
2138: } else {
2139: Failure($client, "error: ".($!+0)
2140: ." IO::File->new Failed ".
2141: "while attempting queryreply\n", $userinput);
2142: }
1.178.2.1 foxr 2143:
2144:
1.178.2.4 albertel 2145: return 1;
1.178.2.1 foxr 2146: }
2147: RegisterHandler("queryreply", \&ReplyQueryHandler, 0, 1, 0);
2148: #
2149: # Process the courseidput query. Not quite sure what this means
2150: # at the system level sense. It appears a gdbm file in the
2151: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and
2152: # a set of entries made in that database.
2153: #
2154: # Parameters:
2155: # $cmd - The command keyword that initiated this request.
2156: # $tail - Tail of the command. In this case consists of a colon
2157: # separated list contaning the domain to apply this to and
2158: # an ampersand separated list of keyword=value pairs.
2159: # $client - Socket open on the client.
2160: # Returns:
2161: # 1 - indicating that processing should continue
2162: #
2163: # Side effects:
2164: # reply is written to the client.
2165: #
2166: sub PutCourseIdHandler {
1.178.2.4 albertel 2167: my $cmd = shift;
2168: my $tail = shift;
2169: my $client = shift;
1.178.2.1 foxr 2170:
1.178.2.4 albertel 2171: my $userinput = "$cmd:$tail";
2172:
1.178.2.10 foxr 2173: my ($udom, $what) = split(/:/, $tail);
1.178.2.4 albertel 2174: chomp($what);
2175: my $now=time;
2176: my @pairs=split(/\&/,$what);
1.178.2.9 foxr 2177:
2178: my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT());
2179: if ($hashref) {
1.178.2.4 albertel 2180: foreach my $pair (@pairs) {
2181: my ($key,$value)=split(/=/,$pair);
1.178.2.9 foxr 2182: $hashref->{$key}=$value.':'.$now;
1.178.2.4 albertel 2183: }
1.178.2.9 foxr 2184: if (untie(%$hashref)) {
1.178.2.4 albertel 2185: Reply($client, "ok\n", $userinput);
2186: } else {
2187: Failure( $client, "error: ".($!+0)
2188: ." untie(GDBM) Failed ".
2189: "while attempting courseidput\n", $userinput);
2190: }
2191: } else {
2192: Failure( $client, "error: ".($!+0)
2193: ." tie(GDBM) Failed ".
2194: "while attempting courseidput\n", $userinput);
2195: }
2196:
2197: return 1;
1.178.2.1 foxr 2198: }
2199: RegisterHandler("courseidput", \&PutCourseIdHandler, 0, 1, 0);
2200:
2201: # Retrieves the value of a course id resource keyword pattern
2202: # defined since a starting date. Both the starting date and the
2203: # keyword pattern are optional. If the starting date is not supplied it
2204: # is treated as the beginning of time. If the pattern is not found,
2205: # it is treatred as "." matching everything.
2206: #
2207: # Parameters:
2208: # $cmd - Command keyword that resulted in us being dispatched.
2209: # $tail - The remainder of the command that, in this case, consists
2210: # of a colon separated list of:
2211: # domain - The domain in which the course database is
2212: # defined.
2213: # since - Optional parameter describing the minimum
2214: # time of definition(?) of the resources that
2215: # will match the dump.
2216: # description - regular expression that is used to filter
2217: # the dump. Only keywords matching this regexp
2218: # will be used.
2219: # $client - The socket open on the client.
2220: # Returns:
2221: # 1 - Continue processing.
2222: # Side Effects:
2223: # a reply is written to $client.
2224: sub DumpCourseIdHandler {
1.178.2.4 albertel 2225: my $cmd = shift;
2226: my $tail = shift;
2227: my $client = shift;
2228:
2229: my $userinput = "$cmd:$tail";
2230:
2231: my ($udom,$since,$description) =split(/:/,$tail);
2232: if (defined($description)) {
2233: $description=&unescape($description);
2234: } else {
2235: $description='.';
2236: }
2237: unless (defined($since)) { $since=0; }
2238: my $qresult='';
1.178.2.17 foxr 2239: logthis(" Looking for $description since $since");
1.178.2.9 foxr 2240: my $hashref = TieDomainHash($udom, "nohist_courseids", &GDBM_WRCREAT());
2241: if ($hashref) {
2242: while (my ($key,$value) = each(%$hashref)) {
1.178.2.4 albertel 2243: my ($descr,$lasttime)=split(/\:/,$value);
1.178.2.17 foxr 2244: logthis("Got: key = $key descr = $descr time: $lasttime");
1.178.2.4 albertel 2245: if ($lasttime<$since) {
1.178.2.17 foxr 2246: logthis("Skipping .. too early");
1.178.2.4 albertel 2247: next;
2248: }
2249: if ($description eq '.') {
1.178.2.17 foxr 2250: logthis("Adding wildcard match");
1.178.2.4 albertel 2251: $qresult.=$key.'='.$descr.'&';
2252: } else {
2253: my $unescapeVal = &unescape($descr);
1.178.2.17 foxr 2254: logthis("Matching with $unescapeVal");
1.178.2.23! www 2255: if (eval('$unescapeVal=~/\Q$description\E/i')) {
1.178.2.17 foxr 2256: logthis("Adding on match");
1.178.2.4 albertel 2257: $qresult.="$key=$descr&";
2258: }
2259: }
2260: }
1.178.2.9 foxr 2261: if (untie(%$hashref)) {
1.178.2.4 albertel 2262: chop($qresult);
2263: Reply($client, "$qresult\n", $userinput);
2264: } else {
2265: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2266: "while attempting courseiddump\n", $userinput);
2267: }
2268: } else {
2269: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2270: "while attempting courseiddump\n", $userinput);
2271: }
1.178.2.1 foxr 2272:
2273:
1.178.2.4 albertel 2274: return 1;
1.178.2.1 foxr 2275: }
2276: RegisterHandler("courseiddump", \&DumpCourseIdHandler, 0, 1, 0);
2277: #
2278: # Puts an id to a domains id database.
2279: #
2280: # Parameters:
2281: # $cmd - The command that triggered us.
2282: # $tail - Remainder of the request other than the command. This is a
2283: # colon separated list containing:
2284: # $domain - The domain for which we are writing the id.
2285: # $pairs - The id info to write... this is and & separated list
2286: # of keyword=value.
2287: # $client - Socket open on the client.
2288: # Returns:
2289: # 1 - Continue processing.
2290: # Side effects:
2291: # reply is written to $client.
2292: #
2293: sub PutIdHandler {
1.178.2.4 albertel 2294: my $cmd = shift;
2295: my $tail = shift;
2296: my $client = shift;
2297:
2298: my $userinput = "$cmd:$tail";
2299:
2300: my ($udom,$what)=split(/:/,$tail);
2301: chomp($what);
2302: my @pairs=split(/\&/,$what);
1.178.2.9 foxr 2303: my $hashref = TieDomainHash($udom, "ids", &GDBM_WRCREAT(),
2304: "P", $what);
2305: if ($hashref) {
1.178.2.4 albertel 2306: foreach my $pair (@pairs) {
2307: my ($key,$value)=split(/=/,$pair);
1.178.2.9 foxr 2308: $hashref->{$key}=$value;
1.178.2.4 albertel 2309: }
1.178.2.9 foxr 2310: if (untie(%$hashref)) {
1.178.2.4 albertel 2311: Reply($client, "ok\n", $userinput);
2312: } else {
2313: Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2314: "while attempting idput\n", $userinput);
2315: }
2316: } else {
2317: Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2318: "while attempting idput\n", $userinput);
1.178.2.1 foxr 2319: }
2320:
1.178.2.4 albertel 2321: return 1;
1.178.2.1 foxr 2322: }
2323:
2324: RegisterHandler("idput", \&PutIdHandler, 0, 1, 0);
2325: #
2326: # Retrieves a set of id values from the id database.
2327: # Returns an & separated list of results, one for each requested id to the
2328: # client.
2329: #
2330: # Parameters:
2331: # $cmd - Command keyword that caused us to be dispatched.
2332: # $tail - Tail of the command. Consists of a colon separated:
2333: # domain - the domain whose id table we dump
2334: # ids Consists of an & separated list of
2335: # id keywords whose values will be fetched.
2336: # nonexisting keywords will have an empty value.
2337: # $client - Socket open on the client.
2338: #
2339: # Returns:
2340: # 1 - indicating processing should continue.
2341: # Side effects:
2342: # An & separated list of results is written to $client.
2343: #
2344: sub GetIdHandler {
1.178.2.4 albertel 2345: my $cmd = shift;
2346: my $tail = shift;
2347: my $client = shift;
1.178.2.10 foxr 2348:
1.178.2.4 albertel 2349: my $userinput = "$client:$tail";
1.178.2.10 foxr 2350:
1.178.2.4 albertel 2351: my ($udom,$what)=split(/:/,$tail);
2352: chomp($what);
2353: my @queries=split(/\&/,$what);
2354: my $qresult='';
1.178.2.9 foxr 2355: my $hashref = TieDomainHash($udom, "ids", &GDBM_READER());
2356: if ($hashref) {
1.178.2.4 albertel 2357: for (my $i=0;$i<=$#queries;$i++) {
1.178.2.9 foxr 2358: $qresult.="$hashref->{$queries[$i]}&";
1.178.2.4 albertel 2359: }
1.178.2.9 foxr 2360: if (untie(%$hashref)) {
1.178.2.4 albertel 2361: $qresult=~s/\&$//;
2362: Reply($client, "$qresult\n", $userinput);
2363: } else {
2364: Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2365: "while attempting idget\n",$userinput);
2366: }
2367: } else {
2368: Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2369: "while attempting idget\n",$userinput);
2370: }
1.178.2.10 foxr 2371:
1.178.2.4 albertel 2372: return 1;
1.178.2.1 foxr 2373: }
1.178.2.3 foxr 2374:
1.178.2.1 foxr 2375: RegisterHandler("idget", \&GetIdHandler, 0, 1, 0);
1.178.2.3 foxr 2376: #
2377: # Process the tmpput command I'm not sure what this does.. Seems to
2378: # create a file in the lonDaemons/tmp directory of the form $id.tmp
2379: # where Id is the client's ip concatenated with a sequence number.
2380: # The file will contain some value that is passed in. Is this e.g.
2381: # a login token?
2382: #
2383: # Parameters:
2384: # $cmd - The command that got us dispatched.
2385: # $tail - The remainder of the request following $cmd:
2386: # In this case this will be the contents of the file.
2387: # $client - Socket connected to the client.
2388: # Returns:
2389: # 1 indicating processing can continue.
2390: # Side effects:
2391: # A file is created in the local filesystem.
2392: # A reply is sent to the client.
2393: sub TmpPutHandler {
1.178.2.4 albertel 2394: my $cmd = shift;
2395: my $what = shift;
2396: my $client = shift;
2397:
2398: my $userinput = "$cmd:$what"; # Reconstruct for logging.
2399:
2400:
2401: my $store;
2402: $tmpsnum++;
1.178.2.18 foxr 2403: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
1.178.2.4 albertel 2404: $id=~s/\W/\_/g;
2405: $what=~s/\n//g;
2406: my $execdir=$perlvar{'lonDaemons'};
2407: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
2408: print $store $what;
2409: close $store;
2410: Reply($client, "$id\n", $userinput);
2411: } else {
2412: Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
2413: "while attempting tmpput\n", $userinput);
2414: }
2415: return 1;
1.178.2.3 foxr 2416:
2417: }
2418: RegisterHandler("tmpput", \&TmpPutHandler, 0, 1, 0);
2419:
2420: # Processes the tmpget command. This command returns the contents
2421: # of a temporary resource file(?) created via tmpput.
2422: #
2423: # Paramters:
2424: # $cmd - Command that got us dispatched.
2425: # $id - Tail of the command, contain the id of the resource
2426: # we want to fetch.
2427: # $client - socket open on the client.
2428: # Return:
2429: # 1 - Inidcating processing can continue.
2430: # Side effects:
2431: # A reply is sent to the client.
2432:
2433: #
2434: sub TmpGetHandler {
1.178.2.4 albertel 2435: my $cmd = shift;
2436: my $id = shift;
2437: my $client = shift;
2438: my $userinput = "$cmd:$id";
1.178.2.10 foxr 2439:
1.178.2.22 foxr 2440:
1.178.2.4 albertel 2441: $id=~s/\W/\_/g;
2442: my $store;
2443: my $execdir=$perlvar{'lonDaemons'};
2444: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
2445: my $reply=<$store>;
2446: Reply( $client, "$reply\n", $userinput);
2447: close $store;
2448: } else {
2449: Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
2450: "while attempting tmpget\n", $userinput);
2451: }
1.178.2.3 foxr 2452:
1.178.2.4 albertel 2453: return 1;
1.178.2.3 foxr 2454: }
2455: RegisterHandler("tmpget", \&TmpGetHandler, 0, 1, 0);
2456: #
2457: # Process the tmpdel command. This command deletes a temp resource
2458: # created by the tmpput command.
2459: #
2460: # Parameters:
2461: # $cmd - Command that got us here.
2462: # $id - Id of the temporary resource created.
2463: # $client - socket open on the client process.
2464: #
2465: # Returns:
2466: # 1 - Indicating processing should continue.
2467: # Side Effects:
2468: # A file is deleted
2469: # A reply is sent to the client.
2470: sub TmpDelHandler {
1.178.2.4 albertel 2471: my $cmd = shift;
2472: my $id = shift;
2473: my $client = shift;
1.178.2.10 foxr 2474:
1.178.2.4 albertel 2475: my $userinput= "$cmd:$id";
1.178.2.10 foxr 2476:
1.178.2.4 albertel 2477: chomp($id);
2478: $id=~s/\W/\_/g;
2479: my $execdir=$perlvar{'lonDaemons'};
2480: if (unlink("$execdir/tmp/$id.tmp")) {
2481: Reply($client, "ok\n", $userinput);
2482: } else {
2483: Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
2484: "while attempting tmpdel\n", $userinput);
2485: }
1.178.2.10 foxr 2486:
1.178.2.4 albertel 2487: return 1;
1.178.2.3 foxr 2488:
2489: }
2490: RegisterHandler("tmpdel", \&TmpDelHandler, 0, 1, 0);
2491: #
2492: # ls - list the contents of a directory. For each file in the
2493: # selected directory the filename followed by the full output of
2494: # the stat function is returned. The returned info for each
2495: # file are separated by ':'. The stat fields are separated by &'s.
2496: # Parameters:
2497: # $cmd - The command that dispatched us (ls).
2498: # $ulsdir - The directory path to list... I'm not sure what this
2499: # is relative as things like ls:. return e.g.
2500: # no_such_dir.
2501: # $client - Socket open on the client.
2502: # Returns:
2503: # 1 - indicating that the daemon should not disconnect.
2504: # Side Effects:
2505: # The reply is written to $client.
2506: #
2507: sub LsHandler {
1.178.2.4 albertel 2508: my $cmd = shift;
2509: my $ulsdir = shift;
2510: my $client = shift;
1.178.2.3 foxr 2511:
1.178.2.4 albertel 2512: my $userinput = "$cmd:$ulsdir";
1.178.2.3 foxr 2513:
1.178.2.19 foxr 2514: chomp($ulsdir);
2515:
1.178.2.4 albertel 2516: my $ulsout='';
2517: my $ulsfn;
1.178.2.19 foxr 2518: logthis("ls for '$ulsdir'");
1.178.2.4 albertel 2519: if (-e $ulsdir) {
1.178.2.19 foxr 2520: logthis("ls - directory exists");
1.178.2.4 albertel 2521: if(-d $ulsdir) {
1.178.2.19 foxr 2522: logthis("ls $ulsdir is a file");
1.178.2.4 albertel 2523: if (opendir(LSDIR,$ulsdir)) {
2524: while ($ulsfn=readdir(LSDIR)) {
2525: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
2526: $ulsout.=$ulsfn.'&'.
2527: join('&',@ulsstats).':';
2528: }
2529: closedir(LSDIR);
2530: }
2531: } else {
2532: my @ulsstats=stat($ulsdir);
2533: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
2534: }
2535: } else {
2536: $ulsout='no_such_dir';
2537: }
2538: if ($ulsout eq '') { $ulsout='empty'; }
2539: Reply($client, "$ulsout\n", $userinput);
2540:
2541:
2542: return 1;
1.178.2.3 foxr 2543: }
2544: RegisterHandler("ls", \&LsHandler, 0, 1, 0);
2545:
2546:
2547: #
2548: # Processes the setannounce command. This command
2549: # creates a file named announce.txt in the top directory of
2550: # the documentn root and sets its contents. The announce.txt file is
2551: # printed in its entirety at the LonCAPA login page. Note:
2552: # once the announcement.txt fileis created it cannot be deleted.
2553: # However, setting the contents of the file to empty removes the
2554: # announcement from the login page of loncapa so who cares.
2555: #
2556: # Parameters:
2557: # $cmd - The command that got us dispatched.
2558: # $announcement - The text of the announcement.
2559: # $client - Socket open on the client process.
2560: # Retunrns:
2561: # 1 - Indicating request processing should continue
2562: # Side Effects:
2563: # The file {DocRoot}/announcement.txt is created.
2564: # A reply is sent to $client.
2565: #
2566: sub SetAnnounceHandler {
1.178.2.4 albertel 2567: my $cmd = shift;
2568: my $announcement = shift;
2569: my $client = shift;
1.178.2.3 foxr 2570:
1.178.2.4 albertel 2571: my $userinput = "$cmd:$announcement";
1.178.2.3 foxr 2572:
1.178.2.4 albertel 2573: chomp($announcement);
2574: $announcement=&unescape($announcement);
2575: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
2576: '/announcement.txt')) {
2577: print $store $announcement;
2578: close $store;
2579: Reply($client, "ok\n", $userinput);
2580: } else {
2581: Failure($client, "error: ".($!+0)."\n", $userinput);
2582: }
1.178.2.3 foxr 2583:
1.178.2.4 albertel 2584: return 1;
1.178.2.3 foxr 2585: }
2586: RegisterHandler("setannounce", \&SetAnnounceHandler, 0, 1, 0);
2587:
2588: #
2589: # Return the version of the daemon. This can be used to determine
2590: # the compatibility of cross version installations or, alternatively to
2591: # simply know who's out of date and who isn't. Note that the version
2592: # is returned concatenated with the tail.
2593: # Parameters:
2594: # $cmd - the request that dispatched to us.
2595: # $tail - Tail of the request (client's version?).
2596: # $client - Socket open on the client.
2597: #Returns:
2598: # 1 - continue processing requests.
2599: # Side Effects:
2600: # Replies with version to $client.
2601: sub GetVersionHandler {
1.178.2.4 albertel 2602: my $client = shift;
2603: my $tail = shift;
2604: my $client = shift;
2605: my $userinput = $client;
2606:
2607: Reply($client, &version($userinput)."\n", $userinput);
1.178.2.3 foxr 2608:
2609:
1.178.2.4 albertel 2610: return 1;
1.178.2.3 foxr 2611: }
2612: RegisterHandler("version", \&GetVersionHandler, 0, 1, 0);
2613:
2614: # Set the current host and domain. This is used to support
2615: # multihomed systems. Each IP of the system, or even separate daemons
2616: # on the same IP can be treated as handling a separate lonCAPA virtual
2617: # machine. This command selects the virtual lonCAPA. The client always
2618: # knows the right one since it is lonc and it is selecting the domain/system
2619: # from the hosts.tab file.
2620: # Parameters:
2621: # $cmd - Command that dispatched us.
2622: # $tail - Tail of the command (domain/host requested).
2623: # $socket - Socket open on the client.
2624: #
2625: # Returns:
2626: # 1 - Indicates the program should continue to process requests.
2627: # Side-effects:
2628: # The default domain/system context is modified for this daemon.
2629: # a reply is sent to the client.
2630: #
2631: sub SelectHostHandler {
1.178.2.4 albertel 2632: my $cmd = shift;
2633: my $tail = shift;
2634: my $socket = shift;
1.178.2.3 foxr 2635:
1.178.2.4 albertel 2636: my $userinput ="$cmd:$tail";
1.178.2.3 foxr 2637:
1.178.2.4 albertel 2638: Reply($client, &sethost($userinput)."\n", $userinput);
1.178.2.3 foxr 2639:
2640:
1.178.2.4 albertel 2641: return 1;
1.178.2.3 foxr 2642: }
2643: RegisterHandler("sethost", \&SelectHostHandler, 0, 1, 0);
2644:
2645: # Process a request to exit:
2646: # - "bye" is sent to the client.
2647: # - The client socket is shutdown and closed.
2648: # - We indicate to the caller that we should exit.
2649: # Formal Parameters:
2650: # $cmd - The command that got us here.
2651: # $tail - Tail of the command (empty).
2652: # $client - Socket open on the tail.
2653: # Returns:
2654: # 0 - Indicating the program should exit!!
2655: #
2656: sub ExitHandler {
1.178.2.4 albertel 2657: my $cmd = shift;
2658: my $tail = shift;
2659: my $client = shift;
2660:
2661: my $userinput = "$cmd:$tail";
2662:
2663: &logthis("Client $clientip ($clientname) hanging up: $userinput");
2664: Reply($client, "bye\n", $userinput);
2665: $client->shutdown(2); # shutdown the socket forcibly.
2666: $client->close();
1.178.2.3 foxr 2667:
1.178.2.4 albertel 2668: return 0;
1.178.2.3 foxr 2669: }
2670: RegisterHandler("exit", \&ExitHandler, 0, 1,1);
2671: RegisterHandler("init", \&ExitHandler, 0, 1,1); # RE-init is like exit.
2672: RegisterHandler("quit", \&ExitHandler, 0, 1,1); # I like this too!
1.178.2.1 foxr 2673: #------------------------------------------------------------------------------------
2674: #
2675: # Process a Request. Takes a request from the client validates
2676: # it and performs the operation requested by it. Returns
2677: # a response to the client.
2678: #
2679: # Parameters:
2680: # request - A string containing the user's request.
2681: # Returns:
2682: # 0 - Requested to exit, caller should shut down.
2683: # 1 - Accept additional requests from the client.
2684: #
2685: sub ProcessRequest {
1.178.2.4 albertel 2686: my $Request = shift;
2687: my $KeepGoing = 1; # Assume we're not asked to stop.
1.178.2.1 foxr 2688:
1.178.2.4 albertel 2689: my $wasenc=0;
2690: my $userinput = $Request; # for compatibility with oldcode <yeach>
1.178.2.1 foxr 2691:
2692:
2693: # ------------------------------------------------------------ See if encrypted
2694:
1.178.2.4 albertel 2695: if($userinput =~ /^enc/) {
2696: $wasenc = 1;
2697: $userinput = Decipher($userinput);
2698: if(! $userinput) {
2699: Failure($client,"error:Encrypted data without negotiating key");
2700: return 0; # Break off with this imposter.
2701: }
2702: }
2703: # Split off the request keyword from the rest of the stuff.
1.178.2.1 foxr 2704:
1.178.2.4 albertel 2705: my ($command, $tail) = split(/:/, $userinput, 2);
1.178.2.19 foxr 2706: chomp($command);
2707: chomp($tail);
1.178.2.22 foxr 2708: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
1.178.2.2 foxr 2709:
1.178.2.4 albertel 2710: Debug("Command received: $command, encoded = $wasenc");
1.178.2.2 foxr 2711:
1.178.2.1 foxr 2712:
2713: # ------------------------------------------------------------- Normal commands
2714:
1.178.2.4 albertel 2715: #
2716: # If the command is in the hash, then execute it via the hash dispatch:
2717: #
2718: if(defined $Dispatcher{$command}) {
2719:
2720: my $DispatchInfo = $Dispatcher{$command};
2721: my $Handler = $$DispatchInfo[0];
2722: my $NeedEncode = $$DispatchInfo[1];
2723: my $ClientTypes = $$DispatchInfo[2];
2724: Debug("Matched dispatch hash: mustencode: $NeedEncode ClientType $ClientTypes");
1.178.2.1 foxr 2725:
1.178.2.4 albertel 2726: # Validate the request:
1.178.2.1 foxr 2727:
1.178.2.4 albertel 2728: my $ok = 1;
2729: my $requesterprivs = 0;
2730: if(isClient()) {
2731: $requesterprivs |= $CLIENT_OK;
2732: }
2733: if(isManager()) {
2734: $requesterprivs |= $MANAGER_OK;
2735: }
2736: if($NeedEncode && (!$wasenc)) {
2737: Debug("Must encode but wasn't: $NeedEncode $wasenc");
2738: $ok = 0;
2739: }
2740: if(($ClientTypes & $requesterprivs) == 0) {
2741: Debug("Client not privileged to do this operation");
2742: $ok = 0;
2743: }
2744:
2745: if($ok) {
2746: Debug("Dispatching to handler $command $tail");
2747: $KeepGoing = &$Handler($command, $tail, $client);
2748: } else {
2749: Debug("Refusing to dispatch because ok is false");
1.178.2.19 foxr 2750: Failure($client, "refused\n", $userinput);
1.178.2.4 albertel 2751: }
1.161 foxr 2752:
2753:
1.178.2.1 foxr 2754: # ------------------------------------------------------------- unknown command
1.97 foxr 2755:
1.178.2.4 albertel 2756: } else {
1.178.2.1 foxr 2757: # unknown command
1.178.2.4 albertel 2758: Failure($client, "unknown_cmd\n", $userinput);
2759: }
1.97 foxr 2760:
1.178.2.1 foxr 2761: return $KeepGoing;
2762: }
1.97 foxr 2763:
1.96 foxr 2764:
2765: #
1.140 foxr 2766: # GetCertificate: Given a transaction that requires a certificate,
2767: # this function will extract the certificate from the transaction
2768: # request. Note that at this point, the only concept of a certificate
2769: # is the hostname to which we are connected.
2770: #
2771: # Parameter:
2772: # request - The request sent by our client (this parameterization may
2773: # need to change when we really use a certificate granting
2774: # authority.
2775: #
2776: sub GetCertificate {
2777: my $request = shift;
2778:
2779: return $clientip;
2780: }
1.161 foxr 2781:
2782:
2783:
1.156 foxr 2784: #
2785: # ReadManagerTable: Reads in the current manager table. For now this is
2786: # done on each manager authentication because:
2787: # - These authentications are not frequent
2788: # - This allows dynamic changes to the manager table
2789: # without the need to signal to the lond.
2790: #
2791:
2792: sub ReadManagerTable {
2793:
2794: # Clean out the old table first..
2795:
1.178.2.4 albertel 2796: foreach my $key (keys %managers) {
2797: delete $managers{$key};
2798: }
2799:
2800: my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
2801: if (!open (MANAGERS, $tablename)) {
2802: logthis('<font color="red">No manager table. Nobody can manage!!</font>');
2803: return;
2804: }
2805: while(my $host = <MANAGERS>) {
2806: chomp($host);
2807: if ($host =~ "^#") { # Comment line.
2808: logthis('<font color="green"> Skipping line: '. "$host</font>\n");
2809: next;
2810: }
2811: if (!defined $hostip{$host}) { # This is a non cluster member
1.161 foxr 2812: # The entry is of the form:
2813: # cluname:hostname
2814: # cluname - A 'cluster hostname' is needed in order to negotiate
2815: # the host key.
2816: # hostname- The dns name of the host.
2817: #
1.178.2.4 albertel 2818: my($cluname, $dnsname) = split(/:/, $host);
2819:
2820: my $ip = gethostbyname($dnsname);
2821: if(defined($ip)) { # bad names don't deserve entry.
2822: my $hostip = inet_ntoa($ip);
2823: $managers{$hostip} = $cluname;
2824: logthis('<font color="green"> registering manager '.
2825: "$dnsname as $cluname with $hostip </font>\n");
2826: }
2827: } else {
2828: logthis('<font color="green"> existing host'." $host</font>\n");
2829: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber
2830: }
2831: }
1.156 foxr 2832: }
1.140 foxr 2833:
2834: #
2835: # ValidManager: Determines if a given certificate represents a valid manager.
2836: # in this primitive implementation, the 'certificate' is
2837: # just the connecting loncapa client name. This is checked
2838: # against a valid client list in the configuration.
2839: #
2840: #
2841: sub ValidManager {
2842: my $certificate = shift;
2843:
1.163 foxr 2844: return isManager;
1.140 foxr 2845: }
2846: #
1.143 foxr 2847: # CopyFile: Called as part of the process of installing a
2848: # new configuration file. This function copies an existing
2849: # file to a backup file.
2850: # Parameters:
2851: # oldfile - Name of the file to backup.
2852: # newfile - Name of the backup file.
2853: # Return:
2854: # 0 - Failure (errno has failure reason).
2855: # 1 - Success.
2856: #
2857: sub CopyFile {
2858: my $oldfile = shift;
2859: my $newfile = shift;
2860:
2861: # The file must exist:
2862:
2863: if(-e $oldfile) {
2864:
1.178.2.4 albertel 2865: # Read the old file.
1.143 foxr 2866:
2867: my $oldfh = IO::File->new("< $oldfile");
2868: if(!$oldfh) {
2869: return 0;
2870: }
2871: my @contents = <$oldfh>; # Suck in the entire file.
2872:
2873: # write the backup file:
2874:
2875: my $newfh = IO::File->new("> $newfile");
2876: if(!(defined $newfh)){
2877: return 0;
2878: }
2879: my $lines = scalar @contents;
2880: for (my $i =0; $i < $lines; $i++) {
2881: print $newfh ($contents[$i]);
2882: }
2883:
2884: $oldfh->close;
2885: $newfh->close;
2886:
2887: chmod(0660, $newfile);
2888:
2889: return 1;
2890:
2891: } else {
2892: return 0;
2893: }
2894: }
1.157 foxr 2895: #
2896: # Host files are passed out with externally visible host IPs.
2897: # If, for example, we are behind a fire-wall or NAT host, our
2898: # internally visible IP may be different than the externally
2899: # visible IP. Therefore, we always adjust the contents of the
2900: # host file so that the entry for ME is the IP that we believe
2901: # we have. At present, this is defined as the entry that
2902: # DNS has for us. If by some chance we are not able to get a
2903: # DNS translation for us, then we assume that the host.tab file
2904: # is correct.
2905: # BUGBUGBUG - in the future, we really should see if we can
2906: # easily query the interface(s) instead.
2907: # Parameter(s):
2908: # contents - The contents of the host.tab to check.
2909: # Returns:
2910: # newcontents - The adjusted contents.
2911: #
2912: #
2913: sub AdjustHostContents {
2914: my $contents = shift;
2915: my $adjusted;
2916: my $me = $perlvar{'lonHostID'};
2917:
1.178.2.4 albertel 2918: foreach my $line (split(/\n/,$contents)) {
1.157 foxr 2919: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
2920: chomp($line);
2921: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
2922: if ($id eq $me) {
1.178.2.4 albertel 2923: my $ip = gethostbyname($name);
2924: my $ipnew = inet_ntoa($ip);
2925: $ip = $ipnew;
1.157 foxr 2926: # Reconstruct the host line and append to adjusted:
2927:
1.178.2.4 albertel 2928: my $newline = "$id:$domain:$role:$name:$ip";
2929: if($maxcon ne "") { # Not all hosts have loncnew tuning params
2930: $newline .= ":$maxcon:$idleto:$mincon";
2931: }
2932: $adjusted .= $newline."\n";
1.157 foxr 2933:
1.178.2.4 albertel 2934: } else { # Not me, pass unmodified.
2935: $adjusted .= $line."\n";
2936: }
1.157 foxr 2937: } else { # Blank or comment never re-written.
2938: $adjusted .= $line."\n"; # Pass blanks and comments as is.
2939: }
1.178.2.4 albertel 2940: }
2941: return $adjusted;
1.157 foxr 2942: }
1.143 foxr 2943: #
2944: # InstallFile: Called to install an administrative file:
2945: # - The file is created with <name>.tmp
2946: # - The <name>.tmp file is then mv'd to <name>
2947: # This lugubrious procedure is done to ensure that we are never without
2948: # a valid, even if dated, version of the file regardless of who crashes
2949: # and when the crash occurs.
2950: #
2951: # Parameters:
2952: # Name of the file
2953: # File Contents.
2954: # Return:
2955: # nonzero - success.
2956: # 0 - failure and $! has an errno.
2957: #
2958: sub InstallFile {
2959: my $Filename = shift;
2960: my $Contents = shift;
2961: my $TempFile = $Filename.".tmp";
2962:
2963: # Open the file for write:
1.178.2.4 albertel 2964:
1.143 foxr 2965: my $fh = IO::File->new("> $TempFile"); # Write to temp.
2966: if(!(defined $fh)) {
2967: &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
2968: return 0;
2969: }
2970: # write the contents of the file:
1.178.2.4 albertel 2971:
1.143 foxr 2972: print $fh ($Contents);
2973: $fh->close; # In case we ever have a filesystem w. locking
2974:
2975: chmod(0660, $TempFile);
2976:
2977: # Now we can move install the file in position.
2978:
2979: move($TempFile, $Filename);
2980:
2981: return 1;
2982: }
1.169 foxr 2983: #
2984: # ConfigFileFromSelector: converts a configuration file selector
2985: # (one of host or domain at this point) into a
2986: # configuration file pathname.
2987: #
2988: # Parameters:
2989: # selector - Configuration file selector.
2990: # Returns:
2991: # Full path to the file or undef if the selector is invalid.
2992: #
2993: sub ConfigFileFromSelector {
2994: my $selector = shift;
2995: my $tablefile;
2996:
2997: my $tabledir = $perlvar{'lonTabDir'}.'/';
2998: if ($selector eq "hosts") {
2999: $tablefile = $tabledir."hosts.tab";
3000: } elsif ($selector eq "domain") {
3001: $tablefile = $tabledir."domain.tab";
3002: } else {
3003: return undef;
3004: }
3005: return $tablefile;
1.143 foxr 3006:
1.169 foxr 3007: }
1.143 foxr 3008: #
1.141 foxr 3009: # PushFile: Called to do an administrative push of a file.
3010: # - Ensure the file being pushed is one we support.
3011: # - Backup the old file to <filename.saved>
3012: # - Separate the contents of the new file out from the
3013: # rest of the request.
3014: # - Write the new file.
3015: # Parameter:
3016: # Request - The entire user request. This consists of a : separated
3017: # string pushfile:tablename:contents.
3018: # NOTE: The contents may have :'s in it as well making things a bit
3019: # more interesting... but not much.
3020: # Returns:
3021: # String to send to client ("ok" or "refused" if bad file).
3022: #
3023: sub PushFile {
3024: my $request = shift;
3025: my ($command, $filename, $contents) = split(":", $request, 3);
3026:
3027: # At this point in time, pushes for only the following tables are
3028: # supported:
3029: # hosts.tab ($filename eq host).
3030: # domain.tab ($filename eq domain).
3031: # Construct the destination filename or reject the request.
3032: #
3033: # lonManage is supposed to ensure this, however this session could be
3034: # part of some elaborate spoof that managed somehow to authenticate.
3035: #
3036:
1.169 foxr 3037:
3038: my $tablefile = ConfigFileFromSelector($filename);
3039: if(! (defined $tablefile)) {
1.141 foxr 3040: return "refused";
3041: }
3042: #
3043: # >copy< the old table to the backup table
3044: # don't rename in case system crashes/reboots etc. in the time
3045: # window between a rename and write.
3046: #
3047: my $backupfile = $tablefile;
3048: $backupfile =~ s/\.tab$/.old/;
1.143 foxr 3049: if(!CopyFile($tablefile, $backupfile)) {
3050: &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
3051: return "error:$!";
3052: }
1.141 foxr 3053: &logthis('<font color="green"> Pushfile: backed up '
1.178.2.4 albertel 3054: .$tablefile." to $backupfile</font>");
1.141 foxr 3055:
1.157 foxr 3056: # If the file being pushed is the host file, we adjust the entry for ourself so that the
3057: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible
3058: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a
3059: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
3060: # that possibilty.
3061:
3062: if($filename eq "host") {
3063: $contents = AdjustHostContents($contents);
3064: }
3065:
1.141 foxr 3066: # Install the new file:
3067:
1.143 foxr 3068: if(!InstallFile($tablefile, $contents)) {
3069: &logthis('<font color="red"> Pushfile: unable to install '
1.178.2.4 albertel 3070: .$tablefile." $! </font>");
1.143 foxr 3071: return "error:$!";
1.178.2.4 albertel 3072: } else {
1.143 foxr 3073: &logthis('<font color="green"> Installed new '.$tablefile
3074: ."</font>");
1.178.2.4 albertel 3075:
1.143 foxr 3076: }
3077:
1.141 foxr 3078:
3079: # Indicate success:
3080:
3081: return "ok";
3082:
3083: }
1.145 foxr 3084:
3085: #
3086: # Called to re-init either lonc or lond.
3087: #
3088: # Parameters:
3089: # request - The full request by the client. This is of the form
3090: # reinit:<process>
3091: # where <process> is allowed to be either of
3092: # lonc or lond
3093: #
3094: # Returns:
3095: # The string to be sent back to the client either:
3096: # ok - Everything worked just fine.
3097: # error:why - There was a failure and why describes the reason.
3098: #
3099: #
3100: sub ReinitProcess {
3101: my $request = shift;
3102:
1.146 foxr 3103:
3104: # separate the request (reinit) from the process identifier and
3105: # validate it producing the name of the .pid file for the process.
3106: #
3107: #
3108: my ($junk, $process) = split(":", $request);
1.147 foxr 3109: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146 foxr 3110: if($process eq 'lonc') {
3111: $processpidfile = $processpidfile."lonc.pid";
1.147 foxr 3112: if (!open(PIDFILE, "< $processpidfile")) {
3113: return "error:Open failed for $processpidfile";
3114: }
3115: my $loncpid = <PIDFILE>;
3116: close(PIDFILE);
3117: logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
3118: ."</font>");
3119: kill("USR2", $loncpid);
1.146 foxr 3120: } elsif ($process eq 'lond') {
1.147 foxr 3121: logthis('<font color="red"> Reinitializing self (lond) </font>');
3122: &UpdateHosts; # Lond is us!!
1.146 foxr 3123: } else {
3124: &logthis('<font color="yellow" Invalid reinit request for '.$process
3125: ."</font>");
3126: return "error:Invalid process identifier $process";
3127: }
1.145 foxr 3128: return 'ok';
3129: }
1.168 foxr 3130: # Validate a line in a configuration file edit script:
3131: # Validation includes:
3132: # - Ensuring the command is valid.
3133: # - Ensuring the command has sufficient parameters
3134: # Parameters:
3135: # scriptline - A line to validate (\n has been stripped for what it's worth).
1.167 foxr 3136: #
1.168 foxr 3137: # Return:
3138: # 0 - Invalid scriptline.
3139: # 1 - Valid scriptline
3140: # NOTE:
3141: # Only the command syntax is checked, not the executability of the
3142: # command.
3143: #
3144: sub isValidEditCommand {
3145: my $scriptline = shift;
3146:
3147: # Line elements are pipe separated:
3148:
3149: my ($command, $key, $newline) = split(/\|/, $scriptline);
3150: &logthis('<font color="green"> isValideditCommand checking: '.
3151: "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
3152:
3153: if ($command eq "delete") {
3154: #
3155: # key with no newline.
3156: #
3157: if( ($key eq "") || ($newline ne "")) {
3158: return 0; # Must have key but no newline.
3159: } else {
3160: return 1; # Valid syntax.
3161: }
1.169 foxr 3162: } elsif ($command eq "replace") {
1.168 foxr 3163: #
3164: # key and newline:
3165: #
3166: if (($key eq "") || ($newline eq "")) {
3167: return 0;
3168: } else {
3169: return 1;
3170: }
1.169 foxr 3171: } elsif ($command eq "append") {
3172: if (($key ne "") && ($newline eq "")) {
3173: return 1;
3174: } else {
3175: return 0;
3176: }
1.168 foxr 3177: } else {
3178: return 0; # Invalid command.
3179: }
3180: return 0; # Should not get here!!!
3181: }
1.169 foxr 3182: #
3183: # ApplyEdit - Applies an edit command to a line in a configuration
3184: # file. It is the caller's responsiblity to validate the
3185: # edit line.
3186: # Parameters:
3187: # $directive - A single edit directive to apply.
3188: # Edit directives are of the form:
3189: # append|newline - Appends a new line to the file.
3190: # replace|key|newline - Replaces the line with key value 'key'
3191: # delete|key - Deletes the line with key value 'key'.
3192: # $editor - A config file editor object that contains the
3193: # file being edited.
3194: #
3195: sub ApplyEdit {
3196: my $directive = shift;
3197: my $editor = shift;
3198:
3199: # Break the directive down into its command and its parameters
3200: # (at most two at this point. The meaning of the parameters, if in fact
3201: # they exist depends on the command).
3202:
3203: my ($command, $p1, $p2) = split(/\|/, $directive);
3204:
3205: if($command eq "append") {
3206: $editor->Append($p1); # p1 - key p2 null.
3207: } elsif ($command eq "replace") {
3208: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline.
3209: } elsif ($command eq "delete") {
3210: $editor->DeleteLine($p1); # p1 - key p2 null.
3211: } else { # Should not get here!!!
1.178.2.4 albertel 3212: die "Invalid command given to ApplyEdit $command";
1.169 foxr 3213: }
3214: }
3215: #
3216: # AdjustOurHost:
3217: # Adjusts a host file stored in a configuration file editor object
3218: # for the true IP address of this host. This is necessary for hosts
3219: # that live behind a firewall.
3220: # Those hosts have a publicly distributed IP of the firewall, but
3221: # internally must use their actual IP. We assume that a given
3222: # host only has a single IP interface for now.
3223: # Formal Parameters:
3224: # editor - The configuration file editor to adjust. This
3225: # editor is assumed to contain a hosts.tab file.
3226: # Strategy:
3227: # - Figure out our hostname.
3228: # - Lookup the entry for this host.
3229: # - Modify the line to contain our IP
3230: # - Do a replace for this host.
3231: sub AdjustOurHost {
3232: my $editor = shift;
3233:
3234: # figure out who I am.
3235:
3236: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname.
3237:
3238: # Get my host file entry.
3239:
3240: my $ConfigLine = $editor->Find($myHostName);
3241: if(! (defined $ConfigLine)) {
3242: die "AdjustOurHost - no entry for me in hosts file $myHostName";
3243: }
3244: # figure out my IP:
3245: # Use the config line to get my hostname.
3246: # Use gethostbyname to translate that into an IP address.
3247: #
3248: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
3249: my $BinaryIp = gethostbyname($name);
3250: my $ip = inet_ntoa($ip);
3251: #
3252: # Reassemble the config line from the elements in the list.
3253: # Note that if the loncnew items were not present before, they will
3254: # be now even if they would be empty
3255: #
3256: my $newConfigLine = $id;
3257: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
3258: $newConfigLine .= ":".$item;
3259: }
3260: # Replace the line:
3261:
3262: $editor->ReplaceLine($id, $newConfigLine);
3263:
3264: }
3265: #
3266: # ReplaceConfigFile:
3267: # Replaces a configuration file with the contents of a
3268: # configuration file editor object.
3269: # This is done by:
3270: # - Copying the target file to <filename>.old
3271: # - Writing the new file to <filename>.tmp
3272: # - Moving <filename.tmp> -> <filename>
3273: # This laborious process ensures that the system is never without
3274: # a configuration file that's at least valid (even if the contents
3275: # may be dated).
3276: # Parameters:
3277: # filename - Name of the file to modify... this is a full path.
3278: # editor - Editor containing the file.
3279: #
3280: sub ReplaceConfigFile {
3281: my $filename = shift;
3282: my $editor = shift;
1.168 foxr 3283:
1.169 foxr 3284: CopyFile ($filename, $filename.".old");
3285:
3286: my $contents = $editor->Get(); # Get the contents of the file.
3287:
3288: InstallFile($filename, $contents);
3289: }
1.168 foxr 3290: #
3291: #
3292: # Called to edit a configuration table file
1.167 foxr 3293: # Parameters:
3294: # request - The entire command/request sent by lonc or lonManage
3295: # Return:
3296: # The reply to send to the client.
1.168 foxr 3297: #
1.167 foxr 3298: sub EditFile {
3299: my $request = shift;
3300:
3301: # Split the command into it's pieces: edit:filetype:script
3302:
1.168 foxr 3303: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script
1.167 foxr 3304:
3305: # Check the pre-coditions for success:
3306:
3307: if($request != "edit") { # Something is amiss afoot alack.
3308: return "error:edit request detected, but request != 'edit'\n";
3309: }
3310: if( ($filetype ne "hosts") &&
3311: ($filetype ne "domain")) {
3312: return "error:edit requested with invalid file specifier: $filetype \n";
3313: }
3314:
3315: # Split the edit script and check it's validity.
1.168 foxr 3316:
3317: my @scriptlines = split(/\n/, $script); # one line per element.
3318: my $linecount = scalar(@scriptlines);
3319: for(my $i = 0; $i < $linecount; $i++) {
3320: chomp($scriptlines[$i]);
3321: if(!isValidEditCommand($scriptlines[$i])) {
3322: return "error:edit with bad script line: '$scriptlines[$i]' \n";
3323: }
3324: }
1.145 foxr 3325:
1.167 foxr 3326: # Execute the edit operation.
1.169 foxr 3327: # - Create a config file editor for the appropriate file and
3328: # - execute each command in the script:
3329: #
3330: my $configfile = ConfigFileFromSelector($filetype);
3331: if (!(defined $configfile)) {
3332: return "refused\n";
3333: }
3334: my $editor = ConfigFileEdit->new($configfile);
1.167 foxr 3335:
1.169 foxr 3336: for (my $i = 0; $i < $linecount; $i++) {
3337: ApplyEdit($scriptlines[$i], $editor);
3338: }
3339: # If the file is the host file, ensure that our host is
3340: # adjusted to have our ip:
3341: #
3342: if($filetype eq "host") {
3343: AdjustOurHost($editor);
3344: }
3345: # Finally replace the current file with our file.
3346: #
3347: ReplaceConfigFile($configfile, $editor);
1.167 foxr 3348:
3349: return "ok\n";
3350: }
1.141 foxr 3351: #
1.96 foxr 3352: # Convert an error return code from lcpasswd to a string value.
3353: #
3354: sub lcpasswdstrerror {
3355: my $ErrorCode = shift;
1.97 foxr 3356: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96 foxr 3357: return "lcpasswd Unrecognized error return value ".$ErrorCode;
3358: } else {
1.98 foxr 3359: return $passwderrors[$ErrorCode];
1.96 foxr 3360: }
3361: }
3362:
1.97 foxr 3363: #
3364: # Convert an error return code from lcuseradd to a string value:
3365: #
3366: sub lcuseraddstrerror {
3367: my $ErrorCode = shift;
3368: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
3369: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
3370: } else {
1.98 foxr 3371: return $adderrors[$ErrorCode];
1.97 foxr 3372: }
3373: }
3374:
1.23 harris41 3375: # grabs exception and records it to log before exiting
3376: sub catchexception {
1.27 albertel 3377: my ($error)=@_;
1.25 www 3378: $SIG{'QUIT'}='DEFAULT';
3379: $SIG{__DIE__}='DEFAULT';
1.165 albertel 3380: &status("Catching exception");
1.23 harris41 3381: &logthis("<font color=red>CRITICAL: "
1.178.2.4 albertel 3382: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
3383: ."a crash with this error msg->[$error]</font>");
1.57 www 3384: &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27 albertel 3385: if ($client) { print $client "error: $error\n"; }
1.59 www 3386: $server->close();
1.27 albertel 3387: die($error);
1.23 harris41 3388: }
3389:
1.63 www 3390: sub timeout {
1.165 albertel 3391: &status("Handling Timeout");
1.63 www 3392: &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
3393: &catchexception('Timeout');
3394: }
1.22 harris41 3395: # -------------------------------- Set signal handlers to record abnormal exits
3396:
3397: $SIG{'QUIT'}=\&catchexception;
3398: $SIG{__DIE__}=\&catchexception;
3399:
1.81 matthew 3400: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95 harris41 3401: &status("Read loncapa.conf and loncapa_apache.conf");
3402: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141 foxr 3403: %perlvar=%{$perlvarref};
1.80 harris41 3404: undef $perlvarref;
1.19 www 3405:
1.35 harris41 3406: # ----------------------------- Make sure this process is running from user=www
3407: my $wwwid=getpwnam('www');
3408: if ($wwwid!=$<) {
1.178.2.4 albertel 3409: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
3410: my $subj="LON: $currenthostid User ID mismatch";
3411: system("echo 'User ID mismatch. lond must be run as user www.' |\
1.35 harris41 3412: mailto $emailto -s '$subj' > /dev/null");
1.178.2.4 albertel 3413: exit 1;
1.35 harris41 3414: }
3415:
1.19 www 3416: # --------------------------------------------- Check if other instance running
3417:
3418: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
3419:
3420: if (-e $pidfile) {
1.178.2.4 albertel 3421: my $lfh=IO::File->new("$pidfile");
3422: my $pide=<$lfh>;
3423: chomp($pide);
3424: if (kill 0 => $pide) { die "already running"; }
1.19 www 3425: }
1.1 albertel 3426:
3427: # ------------------------------------------------------------- Read hosts file
3428:
3429:
3430:
3431: # establish SERVER socket, bind and listen.
3432: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
3433: Type => SOCK_STREAM,
3434: Proto => 'tcp',
3435: Reuse => 1,
3436: Listen => 10 )
1.178.2.4 albertel 3437: or die "making socket: $@\n";
1.1 albertel 3438:
3439: # --------------------------------------------------------- Do global variables
3440:
3441: # global variables
3442:
1.134 albertel 3443: my %children = (); # keys are current child process IDs
1.178.2.1 foxr 3444: my $children = 0; # current number of children
1.1 albertel 3445:
3446: sub REAPER { # takes care of dead children
3447: $SIG{CHLD} = \&REAPER;
1.165 albertel 3448: &status("Handling child death");
1.178.2.1 foxr 3449: my $pid = wait;
3450: if (defined($children{$pid})) {
3451: &logthis("Child $pid died");
3452: $children --;
3453: delete $children{$pid};
3454: } else {
3455: &logthis("Unknown Child $pid died");
1.176 albertel 3456: }
1.165 albertel 3457: &status("Finished Handling child death");
1.1 albertel 3458: }
3459:
3460: sub HUNTSMAN { # signal handler for SIGINT
1.165 albertel 3461: &status("Killing children (INT)");
1.1 albertel 3462: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
3463: kill 'INT' => keys %children;
1.59 www 3464: &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1 albertel 3465: my $execdir=$perlvar{'lonDaemons'};
3466: unlink("$execdir/logs/lond.pid");
1.9 www 3467: &logthis("<font color=red>CRITICAL: Shutting down</font>");
1.165 albertel 3468: &status("Done killing children");
1.1 albertel 3469: exit; # clean up with dignity
3470: }
3471:
3472: sub HUPSMAN { # signal handler for SIGHUP
3473: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
1.165 albertel 3474: &status("Killing children for restart (HUP)");
1.1 albertel 3475: kill 'INT' => keys %children;
1.59 www 3476: &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.9 www 3477: &logthis("<font color=red>CRITICAL: Restarting</font>");
1.134 albertel 3478: my $execdir=$perlvar{'lonDaemons'};
1.30 harris41 3479: unlink("$execdir/logs/lond.pid");
1.165 albertel 3480: &status("Restarting self (HUP)");
1.1 albertel 3481: exec("$execdir/lond"); # here we go again
3482: }
3483:
1.144 foxr 3484: #
1.148 foxr 3485: # Kill off hashes that describe the host table prior to re-reading it.
3486: # Hashes affected are:
3487: # %hostid, %hostdom %hostip
3488: #
3489: sub KillHostHashes {
3490: foreach my $key (keys %hostid) {
3491: delete $hostid{$key};
3492: }
3493: foreach my $key (keys %hostdom) {
3494: delete $hostdom{$key};
3495: }
3496: foreach my $key (keys %hostip) {
3497: delete $hostip{$key};
3498: }
3499: }
3500: #
3501: # Read in the host table from file and distribute it into the various hashes:
3502: #
3503: # - %hostid - Indexed by IP, the loncapa hostname.
3504: # - %hostdom - Indexed by loncapa hostname, the domain.
3505: # - %hostip - Indexed by hostid, the Ip address of the host.
3506: sub ReadHostTable {
3507:
3508: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
3509:
3510: while (my $configline=<CONFIG>) {
1.178.2.1 foxr 3511: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
3512: chomp($ip); $ip=~s/\D+$//;
3513: $hostid{$ip}=$id;
3514: $hostdom{$id}=$domain;
3515: $hostip{$id}=$ip;
3516: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
1.148 foxr 3517: }
3518: close(CONFIG);
3519: }
3520: #
3521: # Reload the Apache daemon's state.
1.150 foxr 3522: # This is done by invoking /home/httpd/perl/apachereload
3523: # a setuid perl script that can be root for us to do this job.
1.148 foxr 3524: #
3525: sub ReloadApache {
1.150 foxr 3526: my $execdir = $perlvar{'lonDaemons'};
3527: my $script = $execdir."/apachereload";
3528: system($script);
1.148 foxr 3529: }
3530:
3531: #
1.144 foxr 3532: # Called in response to a USR2 signal.
3533: # - Reread hosts.tab
3534: # - All children connected to hosts that were removed from hosts.tab
3535: # are killed via SIGINT
3536: # - All children connected to previously existing hosts are sent SIGUSR1
3537: # - Our internal hosts hash is updated to reflect the new contents of
3538: # hosts.tab causing connections from hosts added to hosts.tab to
3539: # now be honored.
3540: #
3541: sub UpdateHosts {
1.165 albertel 3542: &status("Reload hosts.tab");
1.147 foxr 3543: logthis('<font color="blue"> Updating connections </font>');
1.148 foxr 3544: #
3545: # The %children hash has the set of IP's we currently have children
3546: # on. These need to be matched against records in the hosts.tab
3547: # Any ip's no longer in the table get killed off they correspond to
3548: # either dropped or changed hosts. Note that the re-read of the table
3549: # will take care of new and changed hosts as connections come into being.
3550:
3551:
3552: KillHostHashes;
3553: ReadHostTable;
3554:
3555: foreach my $child (keys %children) {
3556: my $childip = $children{$child};
3557: if(!$hostid{$childip}) {
1.149 foxr 3558: logthis('<font color="blue"> UpdateHosts killing child '
3559: ." $child for ip $childip </font>");
1.148 foxr 3560: kill('INT', $child);
1.149 foxr 3561: } else {
3562: logthis('<font color="green"> keeping child for ip '
3563: ." $childip (pid=$child) </font>");
1.148 foxr 3564: }
3565: }
3566: ReloadApache;
1.165 albertel 3567: &status("Finished reloading hosts.tab");
1.144 foxr 3568: }
3569:
1.148 foxr 3570:
1.57 www 3571: sub checkchildren {
1.165 albertel 3572: &status("Checking on the children (sending signals)");
1.57 www 3573: &initnewstatus();
3574: &logstatus();
3575: &logthis('Going to check on the children');
1.134 albertel 3576: my $docdir=$perlvar{'lonDocRoot'};
1.61 harris41 3577: foreach (sort keys %children) {
1.57 www 3578: sleep 1;
3579: unless (kill 'USR1' => $_) {
3580: &logthis ('Child '.$_.' is dead');
3581: &logstatus($$.' is dead');
3582: }
1.61 harris41 3583: }
1.63 www 3584: sleep 5;
1.113 albertel 3585: $SIG{ALRM} = sub { die "timeout" };
3586: $SIG{__DIE__} = 'DEFAULT';
1.165 albertel 3587: &status("Checking on the children (waiting for reports)");
1.63 www 3588: foreach (sort keys %children) {
3589: unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.178.2.4 albertel 3590: eval {
3591: alarm(300);
3592: &logthis('Child '.$_.' did not respond');
3593: kill 9 => $_;
3594: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
3595: #$subj="LON: $currenthostid killed lond process $_";
3596: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
3597: #$execdir=$perlvar{'lonDaemons'};
3598: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
3599: alarm(0);
3600: }
1.63 www 3601: }
3602: }
1.113 albertel 3603: $SIG{ALRM} = 'DEFAULT';
1.155 albertel 3604: $SIG{__DIE__} = \&catchexception;
1.165 albertel 3605: &status("Finished checking children");
1.57 www 3606: }
3607:
1.1 albertel 3608: # --------------------------------------------------------------------- Logging
3609:
3610: sub logthis {
3611: my $message=shift;
3612: my $execdir=$perlvar{'lonDaemons'};
3613: my $fh=IO::File->new(">>$execdir/logs/lond.log");
3614: my $now=time;
3615: my $local=localtime($now);
1.58 www 3616: $lastlog=$local.': '.$message;
1.1 albertel 3617: print $fh "$local ($$): $message\n";
3618: }
3619:
1.77 foxr 3620: # ------------------------- Conditional log if $DEBUG true.
3621: sub Debug {
3622: my $message = shift;
3623: if($DEBUG) {
3624: &logthis($message);
3625: }
3626: }
1.161 foxr 3627:
3628: #
3629: # Sub to do replies to client.. this gives a hook for some
3630: # debug tracing too:
3631: # Parameters:
3632: # fd - File open on client.
3633: # reply - Text to send to client.
3634: # request - Original request from client.
3635: #
1.178.2.1 foxr 3636: # Note: This increments Transactions
3637: #
1.161 foxr 3638: sub Reply {
1.178.2.1 foxr 3639: alarm(120);
1.161 foxr 3640: my $fd = shift;
3641: my $reply = shift;
3642: my $request = shift;
3643:
3644: print $fd $reply;
3645: Debug("Request was $request Reply was $reply");
3646:
1.178.2.1 foxr 3647: $Transactions++;
3648: alarm(0);
3649:
3650:
3651: }
3652: #
3653: # Sub to report a failure.
3654: # This function:
3655: # - Increments the failure statistic counters.
3656: # - Invokes Reply to send the error message to the client.
3657: # Parameters:
3658: # fd - File descriptor open on the client
3659: # reply - Reply text to emit.
3660: # request - The original request message (used by Reply
3661: # to debug if that's enabled.
3662: # Implicit outputs:
3663: # $Failures- The number of failures is incremented.
3664: # Reply (invoked here) sends a message to the
3665: # client:
3666: #
3667: sub Failure {
1.178.2.4 albertel 3668: my $fd = shift;
3669: my $reply = shift;
3670: my $request = shift;
1.178.2.1 foxr 3671:
1.178.2.4 albertel 3672: $Failures++;
3673: Reply($fd, $reply, $request); # That's simple eh?
1.161 foxr 3674: }
1.57 www 3675: # ------------------------------------------------------------------ Log status
3676:
3677: sub logstatus {
1.178.2.4 albertel 3678: &status("Doing logging");
3679: my $docdir=$perlvar{'lonDocRoot'};
3680: {
3681: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
3682: print $fh $$."\t".$currenthostid."\t".$status."\t".$lastlog."\n";
3683: $fh->close();
3684: }
3685: &status("Finished londstatus.txt");
3686: {
3687: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
3688: print $fh $status."\n".$lastlog."\n".time;
3689: $fh->close();
3690: }
3691: ResetStatistics;
3692: &status("Finished logging");
1.178.2.1 foxr 3693:
1.57 www 3694: }
3695:
3696: sub initnewstatus {
3697: my $docdir=$perlvar{'lonDocRoot'};
3698: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
3699: my $now=time;
3700: my $local=localtime($now);
3701: print $fh "LOND status $local - parent $$\n\n";
1.64 www 3702: opendir(DIR,"$docdir/lon-status/londchld");
1.134 albertel 3703: while (my $filename=readdir(DIR)) {
1.64 www 3704: unlink("$docdir/lon-status/londchld/$filename");
3705: }
3706: closedir(DIR);
1.57 www 3707: }
3708:
3709: # -------------------------------------------------------------- Status setting
3710:
3711: sub status {
3712: my $what=shift;
3713: my $now=time;
3714: my $local=localtime($now);
1.178.2.1 foxr 3715: my $status = "lond: $what $local ";
3716: if($Transactions) {
1.178.2.4 albertel 3717: $status .= " Transactions: $Transactions Failed; $Failures";
1.178.2.1 foxr 3718: }
3719: $0=$status;
1.57 www 3720: }
1.11 www 3721:
3722: # -------------------------------------------------------- Escape Special Chars
3723:
3724: sub escape {
3725: my $str=shift;
3726: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
3727: return $str;
3728: }
3729:
3730: # ----------------------------------------------------- Un-Escape Special Chars
3731:
3732: sub unescape {
3733: my $str=shift;
3734: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
3735: return $str;
3736: }
3737:
1.1 albertel 3738: # ----------------------------------------------------------- Send USR1 to lonc
3739:
3740: sub reconlonc {
3741: my $peerfile=shift;
3742: &logthis("Trying to reconnect for $peerfile");
3743: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
3744: if (my $fh=IO::File->new("$loncfile")) {
3745: my $loncpid=<$fh>;
3746: chomp($loncpid);
3747: if (kill 0 => $loncpid) {
3748: &logthis("lonc at pid $loncpid responding, sending USR1");
3749: kill USR1 => $loncpid;
3750: } else {
1.178.2.4 albertel 3751: &logthis("<font color=red>CRITICAL: "
3752: ."lonc at pid $loncpid not responding, giving up</font>");
1.1 albertel 3753: }
3754: } else {
1.178.2.4 albertel 3755: &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
1.1 albertel 3756: }
3757: }
3758:
3759: # -------------------------------------------------- Non-critical communication
1.11 www 3760:
1.1 albertel 3761: sub subreply {
3762: my ($cmd,$server)=@_;
3763: my $peerfile="$perlvar{'lonSockDir'}/$server";
3764: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
3765: Type => SOCK_STREAM,
3766: Timeout => 10)
1.178.2.4 albertel 3767: or return "con_lost";
1.1 albertel 3768: print $sclient "$cmd\n";
3769: my $answer=<$sclient>;
3770: chomp($answer);
3771: if (!$answer) { $answer="con_lost"; }
3772: return $answer;
3773: }
3774:
3775: sub reply {
1.178.2.4 albertel 3776: my ($cmd,$server)=@_;
3777: my $answer;
3778: if ($server ne $currenthostid) {
3779: $answer=subreply($cmd,$server);
3780: if ($answer eq 'con_lost') {
3781: $answer=subreply("ping",$server);
3782: if ($answer ne $server) {
3783: &logthis("sub reply: answer != server answer is $answer, server is $server");
3784: &reconlonc("$perlvar{'lonSockDir'}/$server");
3785: }
3786: $answer=subreply($cmd,$server);
3787: }
3788: } else {
3789: $answer='self_reply';
3790: }
3791: return $answer;
1.1 albertel 3792: }
3793:
1.13 www 3794: # -------------------------------------------------------------- Talk to lonsql
3795:
1.12 harris41 3796: sub sqlreply {
3797: my ($cmd)=@_;
3798: my $answer=subsqlreply($cmd);
3799: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
3800: return $answer;
3801: }
3802:
3803: sub subsqlreply {
3804: my ($cmd)=@_;
3805: my $unixsock="mysqlsock";
3806: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
3807: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
3808: Type => SOCK_STREAM,
3809: Timeout => 10)
1.178.2.4 albertel 3810: or return "con_lost";
1.12 harris41 3811: print $sclient "$cmd\n";
3812: my $answer=<$sclient>;
3813: chomp($answer);
3814: if (!$answer) { $answer="con_lost"; }
3815: return $answer;
3816: }
3817:
1.1 albertel 3818: # -------------------------------------------- Return path to profile directory
1.11 www 3819:
1.1 albertel 3820: sub propath {
3821: my ($udom,$uname)=@_;
1.178.2.11 foxr 3822: Debug("Propath:$udom:$uname");
1.1 albertel 3823: $udom=~s/\W//g;
3824: $uname=~s/\W//g;
1.178.2.11 foxr 3825: Debug("Propath2:$udom:$uname");
1.16 www 3826: my $subdir=$uname.'__';
1.1 albertel 3827: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
3828: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
1.178.2.11 foxr 3829: Debug("Propath returning $proname");
1.1 albertel 3830: return $proname;
3831: }
3832:
3833: # --------------------------------------- Is this the home server of an author?
1.11 www 3834:
1.1 albertel 3835: sub ishome {
3836: my $author=shift;
1.178.2.20 foxr 3837: Debug("ishome: $author");
1.1 albertel 3838: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
1.178.2.20 foxr 3839: Debug(" after big regsub: $author");
1.1 albertel 3840: my ($udom,$uname)=split(/\//,$author);
1.178.2.20 foxr 3841: Debug(" domain: $udom user: $uname");
1.1 albertel 3842: my $proname=propath($udom,$uname);
1.178.2.20 foxr 3843: Debug(" path = $proname");
1.1 albertel 3844: if (-e $proname) {
3845: return 'owner';
3846: } else {
3847: return 'not_owner';
3848: }
3849: }
3850:
3851: # ======================================================= Continue main program
3852: # ---------------------------------------------------- Fork once and dissociate
3853:
1.134 albertel 3854: my $fpid=fork;
1.1 albertel 3855: exit if $fpid;
1.29 harris41 3856: die "Couldn't fork: $!" unless defined ($fpid);
1.1 albertel 3857:
1.29 harris41 3858: POSIX::setsid() or die "Can't start new session: $!";
1.1 albertel 3859:
3860: # ------------------------------------------------------- Write our PID on disk
3861:
1.134 albertel 3862: my $execdir=$perlvar{'lonDaemons'};
1.1 albertel 3863: open (PIDSAVE,">$execdir/logs/lond.pid");
3864: print PIDSAVE "$$\n";
3865: close(PIDSAVE);
1.9 www 3866: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
1.57 www 3867: &status('Starting');
1.1 albertel 3868:
1.106 foxr 3869:
1.1 albertel 3870:
3871: # ----------------------------------------------------- Install signal handlers
3872:
1.57 www 3873:
1.1 albertel 3874: $SIG{CHLD} = \&REAPER;
3875: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
3876: $SIG{HUP} = \&HUPSMAN;
1.57 www 3877: $SIG{USR1} = \&checkchildren;
1.144 foxr 3878: $SIG{USR2} = \&UpdateHosts;
1.106 foxr 3879:
1.148 foxr 3880: # Read the host hashes:
3881:
3882: ReadHostTable;
1.106 foxr 3883:
1.178.2.1 foxr 3884:
1.106 foxr 3885: # --------------------------------------------------------------
3886: # Accept connections. When a connection comes in, it is validated
3887: # and if good, a child process is created to process transactions
3888: # along the connection.
3889:
1.1 albertel 3890: while (1) {
1.165 albertel 3891: &status('Starting accept');
1.106 foxr 3892: $client = $server->accept() or next;
1.165 albertel 3893: &status('Accepted '.$client.' off to spawn');
1.106 foxr 3894: make_new_child($client);
1.165 albertel 3895: &status('Finished spawning');
1.1 albertel 3896: }
3897:
3898: sub make_new_child {
3899: my $pid;
3900: my $sigset;
1.106 foxr 3901:
3902: $client = shift;
1.165 albertel 3903: &status('Starting new child '.$client);
1.161 foxr 3904: &logthis('<font color="green"> Attempting to start child ('.$client.
3905: ")</font>");
1.1 albertel 3906: # block signal for fork
3907: $sigset = POSIX::SigSet->new(SIGINT);
3908: sigprocmask(SIG_BLOCK, $sigset)
1.29 harris41 3909: or die "Can't block SIGINT for fork: $!\n";
1.178.2.4 albertel 3910:
1.29 harris41 3911: die "fork: $!" unless defined ($pid = fork);
1.148 foxr 3912:
3913: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
3914: # connection liveness.
3915:
3916: #
3917: # Figure out who we're talking to so we can record the peer in
3918: # the pid hash.
3919: #
3920: my $caller = getpeername($client);
3921: my ($port,$iaddr)=unpack_sockaddr_in($caller);
3922: $clientip=inet_ntoa($iaddr);
1.1 albertel 3923:
3924: if ($pid) {
3925: # Parent records the child's birth and returns.
3926: sigprocmask(SIG_UNBLOCK, $sigset)
1.29 harris41 3927: or die "Can't unblock SIGINT for fork: $!\n";
1.148 foxr 3928: $children{$pid} = $clientip;
1.178.2.1 foxr 3929: $children++;
1.57 www 3930: &status('Started child '.$pid);
1.1 albertel 3931: return;
3932: } else {
3933: # Child can *not* return from this subroutine.
3934: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
1.126 albertel 3935: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
3936: #don't get intercepted
1.57 www 3937: $SIG{USR1}= \&logstatus;
1.63 www 3938: $SIG{ALRM}= \&timeout;
1.57 www 3939: $lastlog='Forked ';
3940: $status='Forked';
3941:
1.1 albertel 3942: # unblock signals
3943: sigprocmask(SIG_UNBLOCK, $sigset)
1.29 harris41 3944: or die "Can't unblock SIGINT for fork: $!\n";
1.13 www 3945:
1.178.2.1 foxr 3946:
3947:
1.91 albertel 3948: &Authen::Krb5::init_context();
3949: &Authen::Krb5::init_ets();
1.178.2.4 albertel 3950:
1.161 foxr 3951: &status('Accepted connection');
1.1 albertel 3952: # =============================================================================
3953: # do something with the connection
3954: # -----------------------------------------------------------------------------
1.148 foxr 3955: # see if we know client and check for spoof IP by challenge
3956:
1.161 foxr 3957: ReadManagerTable; # May also be a manager!!
3958:
3959: my $clientrec=($hostid{$clientip} ne undef);
3960: my $ismanager=($managers{$clientip} ne undef);
3961: $clientname = "[unknonwn]";
3962: if($clientrec) { # Establish client type.
3963: $ConnectionType = "client";
3964: $clientname = $hostid{$clientip};
3965: if($ismanager) {
3966: $ConnectionType = "both";
3967: }
3968: } else {
3969: $ConnectionType = "manager";
3970: $clientname = $managers{$clientip};
3971: }
3972: my $clientok;
3973: if ($clientrec || $ismanager) {
3974: &status("Waiting for init from $clientip $clientname");
3975: &logthis('<font color="yellow">INFO: Connection, '.
3976: $clientip.
1.178.2.4 albertel 3977: " ($clientname) connection type = $ConnectionType </font>" );
1.161 foxr 3978: &status("Connecting $clientip ($clientname))");
3979: my $remotereq=<$client>;
3980: $remotereq=~s/[^\w:]//g;
3981: if ($remotereq =~ /^init/) {
3982: &sethost("sethost:$perlvar{'lonHostID'}");
3983: my $challenge="$$".time;
3984: print $client "$challenge\n";
1.178.2.4 albertel 3985: &status("Waiting for challenge reply from $clientip ($clientname)");
1.161 foxr 3986: $remotereq=<$client>;
3987: $remotereq=~s/\W//g;
3988: if ($challenge eq $remotereq) {
3989: $clientok=1;
3990: print $client "ok\n";
3991: } else {
1.178.2.4 albertel 3992: &logthis("<font color=blue>WARNING: $clientip did not reply challenge</font>");
1.161 foxr 3993: &status('No challenge reply '.$clientip);
3994: }
1.2 www 3995: } else {
1.178.2.4 albertel 3996: &logthis("<font color=blue>WARNING: "
1.161 foxr 3997: ."$clientip failed to initialize: >$remotereq< </font>");
3998: &status('No init '.$clientip);
3999: }
4000: } else {
1.178.2.4 albertel 4001: &logthis("<font color=blue>WARNING: Unknown client $clientip</font>");
1.161 foxr 4002: &status('Hung up on '.$clientip);
4003: }
4004: if ($clientok) {
1.1 albertel 4005: # ---------------- New known client connecting, could mean machine online again
1.161 foxr 4006:
4007: foreach my $id (keys(%hostip)) {
4008: if ($hostip{$id} ne $clientip ||
4009: $hostip{$currenthostid} eq $clientip) {
4010: # no need to try to do recon's to myself
4011: next;
1.115 albertel 4012: }
1.161 foxr 4013: &reconlonc("$perlvar{'lonSockDir'}/$id");
4014: }
4015: &logthis("<font color=green>Established connection: $clientname</font>");
4016: &status('Will listen to '.$clientname);
4017:
1.178.2.1 foxr 4018: ResetStatistics();
1.161 foxr 4019:
1.178.2.1 foxr 4020: # ------------------------------------------------------------ Process requests
4021: my $KeepGoing = 1;
4022: while ((my $userinput=GetRequest) && $KeepGoing) {
4023: $KeepGoing = ProcessRequest($userinput);
1.177 foxr 4024: # -------------------------------------------------------------------- complete
1.178.2.1 foxr 4025:
1.161 foxr 4026: &status('Listening to '.$clientname);
4027: }
1.59 www 4028: # --------------------------------------------- client unknown or fishy, refuse
1.161 foxr 4029: } else {
4030: print $client "refused\n";
4031: $client->close();
4032: &logthis("<font color=blue>WARNING: "
4033: ."Rejected client $clientip, closing connection</font>");
4034: }
4035: }
4036:
1.1 albertel 4037: # =============================================================================
1.161 foxr 4038:
4039: &logthis("<font color=red>CRITICAL: "
4040: ."Disconnect from $clientip ($clientname)</font>");
4041:
4042:
4043: # this exit is VERY important, otherwise the child will become
4044: # a producer of more and more children, forking yourself into
4045: # process death.
4046: exit;
1.106 foxr 4047:
1.78 foxr 4048: }
4049:
4050:
4051: #
4052: # Checks to see if the input roleput request was to set
4053: # an author role. If so, invokes the lchtmldir script to set
4054: # up a correct public_html
4055: # Parameters:
4056: # request - The request sent to the rolesput subchunk.
4057: # We're looking for /domain/_au
4058: # domain - The domain in which the user is having roles doctored.
4059: # user - Name of the user for which the role is being put.
4060: # authtype - The authentication type associated with the user.
4061: #
1.178.2.4 albertel 4062: sub ManagePermissions {
1.78 foxr 4063: my $request = shift;
4064: my $domain = shift;
4065: my $user = shift;
4066: my $authtype= shift;
4067:
4068: # See if the request is of the form /$domain/_au
1.178.2.19 foxr 4069: &logthis("request is $request");
1.78 foxr 4070: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
4071: my $execdir = $perlvar{'lonDaemons'};
4072: my $userhome= "/home/$user" ;
1.134 albertel 4073: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.78 foxr 4074: system("$execdir/lchtmldir $userhome $user $authtype");
4075: }
4076: }
1.178.2.8 foxr 4077:
4078: #
4079: # Return the full path of a user password file, whether it exists or not.
4080: # Parameters:
4081: # domain - Domain in which the password file lives.
4082: # user - name of the user.
4083: # Returns:
4084: # Full passwd path:
4085: #
4086: sub PasswordPath {
4087: my $domain = shift;
4088: my $user = shift;
4089:
4090: my $path = &propath($domain, $user);
1.178.2.11 foxr 4091: $path .= "/passwd";
1.178.2.8 foxr 4092:
4093: return $path;
4094: }
4095:
4096: # Password Filename
4097: # Returns the path to a passwd file given domain and user... only if
4098: # it exists.
4099: # Parameters:
4100: # domain - Domain in which to search.
4101: # user - username.
4102: # Returns:
4103: # - If the password file exists returns its path.
4104: # - If the password file does not exist, returns undefined.
4105: #
4106: sub PasswordFilename {
4107: my $domain = shift;
4108: my $user = shift;
4109:
1.178.2.11 foxr 4110: Debug ("PasswordFilename called: dom = $domain user = $user");
1.178.2.8 foxr 4111:
1.178.2.11 foxr 4112: my $path = PasswordPath($domain, $user);
4113: Debug("PasswordFilename got path: $path");
1.178.2.8 foxr 4114: if(-e $path) {
4115: return $path;
4116: } else {
4117: return undef;
4118: }
4119: }
4120:
4121: #
4122: # Rewrite the contents of the user's passwd file.
4123: # Parameters:
4124: # domain - domain of the user.
4125: # name - User's name.
4126: # contents - New contents of the file.
4127: # Returns:
4128: # 0 - Failed.
4129: # 1 - Success.
4130: #
4131: sub RewritePwFile {
4132: my $domain = shift;
4133: my $user = shift;
4134: my $contents = shift;
4135:
4136: my $file = PasswordFilename($domain, $user);
4137: if (defined $file) {
4138: my $pf = IO::File->new(">$file");
4139: if($pf) {
4140: print $pf "$contents\n";
4141: return 1;
4142: } else {
4143: return 0;
4144: }
4145: } else {
4146: return 0;
4147: }
4148:
4149: }
1.78 foxr 4150: #
4151: # GetAuthType - Determines the authorization type of a user in a domain.
4152:
4153: # Returns the authorization type or nouser if there is no such user.
4154: #
1.178.2.4 albertel 4155: sub GetAuthType {
1.78 foxr 4156: my $domain = shift;
4157: my $user = shift;
4158:
1.79 foxr 4159: Debug("GetAuthType( $domain, $user ) \n");
1.178.2.8 foxr 4160: my $passwdfile = PasswordFilename($domain, $user);
4161: if( defined $passwdfile ) {
1.78 foxr 4162: my $pf = IO::File->new($passwdfile);
4163: my $realpassword = <$pf>;
4164: chomp($realpassword);
1.79 foxr 4165: Debug("Password info = $realpassword\n");
1.178.2.8 foxr 4166: return $realpassword;
1.178.2.4 albertel 4167: } else {
1.79 foxr 4168: Debug("Returning nouser");
1.78 foxr 4169: return "nouser";
4170: }
1.1 albertel 4171: }
4172:
1.178.2.13 foxr 4173: #
4174: # Validate a user given their domain, name and password. This utility
4175: # function is used by both AuthenticateHandler and ChangePasswordHandler
4176: # to validate the login credentials of a user.
4177: # Parameters:
4178: # $domain - The domain being logged into (this is required due to
4179: # the capability for multihomed systems.
4180: # $user - The name of the user being validated.
4181: # $password - The user's propoposed password.
4182: #
4183: # Returns:
4184: # 1 - The domain,user,pasword triplet corresponds to a valid
4185: # user.
4186: # 0 - The domain,user,password triplet is not a valid user.
4187: #
4188: sub ValidateUser {
4189: my $domain = shift;
4190: my $user = shift;
4191: my $password= shift;
4192:
4193: # Why negative ~pi you may well ask? Well this function is about
4194: # authentication, and therefore very important to get right.
4195: # I've initialized the flag that determines whether or not I've
4196: # validated correctly to a value it's not supposed to get.
4197: # At the end of this function. I'll ensure that it's not still that
4198: # value so we don't just wind up returning some accidental value
4199: # as a result of executing an unforseen code path that
4200: # did not set $validated.
4201:
4202: my $validated = -3.14159;
4203:
4204: # How we authenticate is determined by the type of authentication
4205: # the user has been assigned. If the authentication type is
4206: # "nouser", the user does not exist so we will return 0.
4207:
4208: my $contents = GetAuthType($domain, $user);
4209: my ($howpwd, $contentpwd) = split(/:/, $contents);
4210:
4211: my $null = pack("C",0); # Used by kerberos auth types.
4212:
4213: if ($howpwd ne 'nouser') {
4214:
4215: if($howpwd eq "internal") { # Encrypted is in local password file.
4216: $validated = (crypt($password, $contentpwd) eq $contentpwd);
4217: }
4218: elsif ($howpwd eq "unix") { # User is a normal unix user.
1.178.2.14 foxr 4219: $contentpwd = (getpwnam($user))[1];
1.178.2.13 foxr 4220: if($contentpwd) {
4221: if($contentpwd eq 'x') { # Shadow password file...
4222: my $pwauth_path = "/usr/local/sbin/pwauth";
4223: open PWAUTH, "|$pwauth_path" or
4224: die "Cannot invoke authentication";
4225: print PWAUTH "$user\n$password\n";
4226: close PWAUTH;
4227: $validated = ! $?;
4228:
4229: } else { # Passwords in /etc/passwd.
4230: $validated = (crypt($password,
4231: $contentpwd) eq $contentpwd);
4232: }
4233: } else {
4234: $validated = 0;
4235: }
4236: }
4237: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
4238: if(! ($password =~ /$null/) ) {
4239: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
4240: "",
4241: $contentpwd,,
4242: 'krbtgt',
4243: $contentpwd,
4244: 1,
4245: $password);
4246: if(!$k4error) {
4247: $validated = 1;
4248: }
4249: else {
4250: $validated = 0;
4251: &logthis('krb4: '.$user.', '.$contentpwd.', '.
4252: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
4253: }
4254: }
4255: else {
4256: $validated = 0; # Password has a match with null.
4257: }
4258: }
4259: elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
4260: if(!($password =~ /$null/)) { # Null password not allowed.
4261: my $krbclient = &Authen::Krb5::parse_name($user.'@'
4262: .$contentpwd);
4263: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
4264: my $krbserver = &Authen::Krb5::parse_name($krbservice);
4265: my $credentials= &Authen::Krb5::cc_default();
4266: $credentials->initialize($krbclient);
4267: my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient,
4268: $krbserver,
4269: $password,
4270: $credentials);
4271: $validated = ($krbreturn == 1);
4272: }
4273: else {
4274: $validated = 0;
4275: }
4276: }
4277: elsif ($howpwd eq "localauth") {
4278: # Authenticate via installation specific authentcation method:
4279: $validated = &localauth::localauth($user,
4280: $password,
4281: $contentpwd);
4282: }
4283: else { # Unrecognized auth is also bad.
4284: $validated = 0;
4285: }
4286: } else {
4287: $validated = 0;
4288: }
4289: #
4290: # $validated has the correct stat of the authentication:
4291: #
4292:
4293: unless ($validated != -3.14159) {
4294: die "ValidateUser - failed to set the value of validated";
4295: }
4296: return $validated;
4297: }
4298:
4299: #
4300: # Add a line to the subscription list?
4301: #
1.84 albertel 4302: sub addline {
4303: my ($fname,$hostid,$ip,$newline)=@_;
4304: my $contents;
4305: my $found=0;
4306: my $expr='^'.$hostid.':'.$ip.':';
4307: $expr =~ s/\./\\\./g;
1.134 albertel 4308: my $sh;
1.178.2.20 foxr 4309: Debug("Looking for $expr");
1.84 albertel 4310: if ($sh=IO::File->new("$fname.subscription")) {
4311: while (my $subline=<$sh>) {
1.178.2.20 foxr 4312: Debug("addline: line: $subline");
4313: if ($subline !~ /$expr/) {
4314: $contents.= $subline;
4315: } else {
4316: Debug("Found $subline");
4317: $found=1;
4318: }
1.84 albertel 4319: }
4320: $sh->close();
4321: }
4322: $sh=IO::File->new(">$fname.subscription");
4323: if ($contents) { print $sh $contents; }
1.178.2.20 foxr 4324: if ($newline) {
4325: Debug("Appending $newline");
4326: print $sh $newline;
4327: }
1.84 albertel 4328: $sh->close();
4329: return $found;
1.86 www 4330: }
1.178.2.13 foxr 4331: #
4332: # Get chat messages.
4333: #
1.86 www 4334: sub getchat {
1.122 www 4335: my ($cdom,$cname,$udom,$uname)=@_;
1.87 www 4336: my %hash;
4337: my $proname=&propath($cdom,$cname);
4338: my @entries=();
1.88 albertel 4339: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
4340: &GDBM_READER(),0640)) {
4341: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
4342: untie %hash;
1.123 www 4343: }
1.124 www 4344: my @participants=();
1.134 albertel 4345: my $cutoff=time-60;
1.123 www 4346: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
1.124 www 4347: &GDBM_WRCREAT(),0640)) {
4348: $hash{$uname.':'.$udom}=time;
1.123 www 4349: foreach (sort keys %hash) {
4350: if ($hash{$_}>$cutoff) {
1.124 www 4351: $participants[$#participants+1]='active_participant:'.$_;
1.123 www 4352: }
4353: }
4354: untie %hash;
1.86 www 4355: }
1.124 www 4356: return (@participants,@entries);
1.86 www 4357: }
1.178.2.13 foxr 4358: #
4359: # Add a chat message
4360: #
1.86 www 4361: sub chatadd {
1.88 albertel 4362: my ($cdom,$cname,$newchat)=@_;
4363: my %hash;
4364: my $proname=&propath($cdom,$cname);
4365: my @entries=();
1.142 www 4366: my $time=time;
1.88 albertel 4367: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
4368: &GDBM_WRCREAT(),0640)) {
4369: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
4370: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
4371: my ($thentime,$idnum)=split(/\_/,$lastid);
4372: my $newid=$time.'_000000';
4373: if ($thentime==$time) {
4374: $idnum=~s/^0+//;
4375: $idnum++;
4376: $idnum=substr('000000'.$idnum,-6,6);
4377: $newid=$time.'_'.$idnum;
4378: }
4379: $hash{$newid}=$newchat;
4380: my $expired=$time-3600;
4381: foreach (keys %hash) {
4382: my ($thistime)=($_=~/(\d+)\_/);
4383: if ($thistime<$expired) {
1.89 www 4384: delete $hash{$_};
1.88 albertel 4385: }
4386: }
4387: untie %hash;
1.142 www 4388: }
4389: {
4390: my $hfh;
4391: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
4392: print $hfh "$time:".&unescape($newchat)."\n";
4393: }
1.86 www 4394: }
1.84 albertel 4395: }
4396:
4397: sub unsub {
4398: my ($fname,$clientip)=@_;
4399: my $result;
1.178.2.21 foxr 4400: my $unsubs = 0; # Number of successful unsubscribes:
4401:
4402:
4403: # An old way subscriptions were handled was to have a
4404: # subscription marker file:
4405:
4406: Debug("Attempting unlink of $fname.$clientname");
4407: if (unlink("$fname.$clientname")) {
4408: $unsubs++; # Successful unsub via marker file.
4409: }
4410:
4411: # The more modern way to do it is to have a subscription list
4412: # file:
4413:
1.84 albertel 4414: if (-e "$fname.subscription") {
1.161 foxr 4415: my $found=&addline($fname,$clientname,$clientip,'');
1.178.2.20 foxr 4416: if ($found) {
1.178.2.21 foxr 4417: $unsubs++;
1.178.2.20 foxr 4418: }
1.178.2.21 foxr 4419: }
4420:
4421: # If either or both of these mechanisms succeeded in unsubscribing a
4422: # resource we can return ok:
4423:
4424: if($unsubs) {
4425: $result = "ok\n";
1.84 albertel 4426: } else {
1.178.2.21 foxr 4427: $result = "not_subscribed\n";
1.84 albertel 4428: }
1.178.2.21 foxr 4429:
1.84 albertel 4430: return $result;
4431: }
4432:
1.101 www 4433: sub currentversion {
4434: my $fname=shift;
4435: my $version=-1;
4436: my $ulsdir='';
4437: if ($fname=~/^(.+)\/[^\/]+$/) {
1.178.2.4 albertel 4438: $ulsdir=$1;
1.101 www 4439: }
1.114 albertel 4440: my ($fnamere1,$fnamere2);
4441: # remove version if already specified
1.101 www 4442: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114 albertel 4443: # get the bits that go before and after the version number
4444: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
4445: $fnamere1=$1;
4446: $fnamere2='.'.$2;
4447: }
1.101 www 4448: if (-e $fname) { $version=1; }
4449: if (-e $ulsdir) {
1.134 albertel 4450: if(-d $ulsdir) {
4451: if (opendir(LSDIR,$ulsdir)) {
4452: my $ulsfn;
4453: while ($ulsfn=readdir(LSDIR)) {
1.101 www 4454: # see if this is a regular file (ignore links produced earlier)
1.134 albertel 4455: my $thisfile=$ulsdir.'/'.$ulsfn;
4456: unless (-l $thisfile) {
1.160 www 4457: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134 albertel 4458: if ($1>$version) { $version=$1; }
4459: }
4460: }
4461: }
4462: closedir(LSDIR);
4463: $version++;
4464: }
4465: }
4466: }
4467: return $version;
1.101 www 4468: }
4469:
4470: sub thisversion {
4471: my $fname=shift;
4472: my $version=-1;
4473: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
4474: $version=$1;
4475: }
4476: return $version;
4477: }
4478:
1.84 albertel 4479: sub subscribe {
4480: my ($userinput,$clientip)=@_;
1.178.2.20 foxr 4481: chomp($userinput);
1.84 albertel 4482: my $result;
4483: my ($cmd,$fname)=split(/:/,$userinput);
4484: my $ownership=&ishome($fname);
1.178.2.20 foxr 4485: Debug("subscribe: Owner = $ownership file: '$fname'");
1.84 albertel 4486: if ($ownership eq 'owner') {
1.101 www 4487: # explitly asking for the current version?
4488: unless (-e $fname) {
1.178.2.20 foxr 4489: Debug("subscribe - does not exist");
1.101 www 4490: my $currentversion=¤tversion($fname);
4491: if (&thisversion($fname)==$currentversion) {
4492: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
4493: my $root=$1;
4494: my $extension=$2;
4495: symlink($root.'.'.$extension,
4496: $root.'.'.$currentversion.'.'.$extension);
1.102 www 4497: unless ($extension=~/\.meta$/) {
1.178.2.4 albertel 4498: symlink($root.'.'.$extension.'.meta',
4499: $root.'.'.$currentversion.'.'.$extension.'.meta');
1.102 www 4500: }
1.101 www 4501: }
4502: }
4503: }
1.84 albertel 4504: if (-e $fname) {
1.178.2.20 foxr 4505: Debug("subscribe - exists");
1.84 albertel 4506: if (-d $fname) {
4507: $result="directory\n";
4508: } else {
1.161 foxr 4509: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134 albertel 4510: my $now=time;
1.161 foxr 4511: my $found=&addline($fname,$clientname,$clientip,
4512: "$clientname:$clientip:$now\n");
1.84 albertel 4513: if ($found) { $result="$fname\n"; }
4514: # if they were subscribed to only meta data, delete that
4515: # subscription, when you subscribe to a file you also get
4516: # the metadata
4517: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
4518: $fname=~s/\/home\/httpd\/html\/res/raw/;
4519: $fname="http://$thisserver/".$fname;
4520: $result="$fname\n";
4521: }
4522: } else {
4523: $result="not_found\n";
4524: }
4525: } else {
4526: $result="rejected\n";
4527: }
4528: return $result;
4529: }
1.91 albertel 4530:
4531: sub make_passwd_file {
1.98 foxr 4532: my ($uname, $umode,$npass,$passfilename)=@_;
1.91 albertel 4533: my $result="ok\n";
4534: if ($umode eq 'krb4' or $umode eq 'krb5') {
4535: {
4536: my $pf = IO::File->new(">$passfilename");
4537: print $pf "$umode:$npass\n";
4538: }
4539: } elsif ($umode eq 'internal') {
4540: my $salt=time;
4541: $salt=substr($salt,6,2);
4542: my $ncpass=crypt($npass,$salt);
4543: {
4544: &Debug("Creating internal auth");
4545: my $pf = IO::File->new(">$passfilename");
4546: print $pf "internal:$ncpass\n";
4547: }
4548: } elsif ($umode eq 'localauth') {
4549: {
4550: my $pf = IO::File->new(">$passfilename");
4551: print $pf "localauth:$npass\n";
4552: }
4553: } elsif ($umode eq 'unix') {
1.178.2.14 foxr 4554: #
4555: # Don't allow the creation of privileged accounts!!! that would
4556: # be real bad!!!
4557: #
4558: my $uid = getpwnam($uname);
4559: if((defined $uid) && ($uid == 0)) {
1.178.2.15 foxr 4560: &logthis(">>>Attempted add of privileged account blocked<<<");
1.178.2.14 foxr 4561: return "no_priv_account_error\n";
1.91 albertel 4562: }
1.178.2.14 foxr 4563:
4564: #
4565: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
4566:
4567: &Debug("Executing external: ".$execpath);
4568: &Debug("user = ".$uname.", Password =". $npass);
4569: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
4570: print $se "$uname\n";
4571: print $se "$npass\n";
4572: print $se "$npass\n";
4573:
4574: my $useraddok = $?;
4575: if($useraddok > 0) {
1.178.2.16 foxr 4576: my $lcstring = lcuseraddstrerror($useraddok);
4577: &logthis("Failed lcuseradd: $lcstring");
4578: return "error: lcuseradd failed: $lcstring\n";
1.178.2.14 foxr 4579: }
4580: my $pf = IO::File->new(">$passfilename");
4581: print $pf "unix:\n";
4582:
1.91 albertel 4583: } elsif ($umode eq 'none') {
4584: {
4585: my $pf = IO::File->new(">$passfilename");
4586: print $pf "none:\n";
4587: }
4588: } else {
4589: $result="auth_mode_error\n";
4590: }
4591: return $result;
1.121 albertel 4592: }
4593:
4594: sub sethost {
4595: my ($remotereq) = @_;
1.178.2.19 foxr 4596: Debug("sethost got $remotereq");
1.121 albertel 4597: my (undef,$hostid)=split(/:/,$remotereq);
4598: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
1.178.2.19 foxr 4599: Debug("sethost attempting to set host $hostid");
1.121 albertel 4600: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
4601: $currenthostid=$hostid;
4602: $currentdomainid=$hostdom{$hostid};
4603: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
4604: } else {
4605: &logthis("Requested host id $hostid not an alias of ".
4606: $perlvar{'lonHostID'}." refusing connection");
4607: return 'unable_to_set';
4608: }
4609: return 'ok';
4610: }
4611:
4612: sub version {
4613: my ($userinput)=@_;
4614: $remoteVERSION=(split(/:/,$userinput))[1];
4615: return "version:$VERSION";
1.127 albertel 4616: }
1.178.2.1 foxr 4617: ############## >>>>>>>>>>>>>>>>>>>>>>>>>> FUTUREWORK <<<<<<<<<<<<<<<<<<<<<<<<<<<<
1.128 albertel 4618: #There is a copy of this in lonnet.pm
1.178.2.1 foxr 4619: # Can we hoist these lil' things out into common places?
4620: #
1.127 albertel 4621: sub userload {
4622: my $numusers=0;
4623: {
4624: opendir(LONIDS,$perlvar{'lonIDsDir'});
4625: my $filename;
4626: my $curtime=time;
4627: while ($filename=readdir(LONIDS)) {
4628: if ($filename eq '.' || $filename eq '..') {next;}
1.138 albertel 4629: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159 albertel 4630: if ($curtime-$mtime < 1800) { $numusers++; }
1.127 albertel 4631: }
4632: closedir(LONIDS);
4633: }
4634: my $userloadpercent=0;
4635: my $maxuserload=$perlvar{'lonUserLoadLim'};
4636: if ($maxuserload) {
1.129 albertel 4637: $userloadpercent=100*$numusers/$maxuserload;
1.127 albertel 4638: }
1.130 albertel 4639: $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127 albertel 4640: return $userloadpercent;
1.91 albertel 4641: }
4642:
1.61 harris41 4643: # ----------------------------------- POD (plain old documentation, CPAN style)
4644:
4645: =head1 NAME
4646:
4647: lond - "LON Daemon" Server (port "LOND" 5663)
4648:
4649: =head1 SYNOPSIS
4650:
1.74 harris41 4651: Usage: B<lond>
4652:
4653: Should only be run as user=www. This is a command-line script which
4654: is invoked by B<loncron>. There is no expectation that a typical user
4655: will manually start B<lond> from the command-line. (In other words,
4656: DO NOT START B<lond> YOURSELF.)
1.61 harris41 4657:
4658: =head1 DESCRIPTION
4659:
1.74 harris41 4660: There are two characteristics associated with the running of B<lond>,
4661: PROCESS MANAGEMENT (starting, stopping, handling child processes)
4662: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
4663: subscriptions, etc). These are described in two large
4664: sections below.
4665:
4666: B<PROCESS MANAGEMENT>
4667:
1.61 harris41 4668: Preforker - server who forks first. Runs as a daemon. HUPs.
4669: Uses IDEA encryption
4670:
1.74 harris41 4671: B<lond> forks off children processes that correspond to the other servers
4672: in the network. Management of these processes can be done at the
4673: parent process level or the child process level.
4674:
4675: B<logs/lond.log> is the location of log messages.
4676:
4677: The process management is now explained in terms of linux shell commands,
4678: subroutines internal to this code, and signal assignments:
4679:
4680: =over 4
4681:
4682: =item *
4683:
4684: PID is stored in B<logs/lond.pid>
4685:
4686: This is the process id number of the parent B<lond> process.
4687:
4688: =item *
4689:
4690: SIGTERM and SIGINT
4691:
4692: Parent signal assignment:
4693: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
4694:
4695: Child signal assignment:
4696: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
4697: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
4698: to restart a new child.)
4699:
4700: Command-line invocations:
4701: B<kill> B<-s> SIGTERM I<PID>
4702: B<kill> B<-s> SIGINT I<PID>
4703:
4704: Subroutine B<HUNTSMAN>:
4705: This is only invoked for the B<lond> parent I<PID>.
4706: This kills all the children, and then the parent.
4707: The B<lonc.pid> file is cleared.
4708:
4709: =item *
4710:
4711: SIGHUP
4712:
4713: Current bug:
4714: This signal can only be processed the first time
4715: on the parent process. Subsequent SIGHUP signals
4716: have no effect.
4717:
4718: Parent signal assignment:
4719: $SIG{HUP} = \&HUPSMAN;
4720:
4721: Child signal assignment:
4722: none (nothing happens)
4723:
4724: Command-line invocations:
4725: B<kill> B<-s> SIGHUP I<PID>
4726:
4727: Subroutine B<HUPSMAN>:
4728: This is only invoked for the B<lond> parent I<PID>,
4729: This kills all the children, and then the parent.
4730: The B<lond.pid> file is cleared.
4731:
4732: =item *
4733:
4734: SIGUSR1
4735:
4736: Parent signal assignment:
4737: $SIG{USR1} = \&USRMAN;
4738:
4739: Child signal assignment:
4740: $SIG{USR1}= \&logstatus;
4741:
4742: Command-line invocations:
4743: B<kill> B<-s> SIGUSR1 I<PID>
4744:
4745: Subroutine B<USRMAN>:
4746: When invoked for the B<lond> parent I<PID>,
4747: SIGUSR1 is sent to all the children, and the status of
4748: each connection is logged.
1.144 foxr 4749:
4750: =item *
4751:
4752: SIGUSR2
4753:
4754: Parent Signal assignment:
4755: $SIG{USR2} = \&UpdateHosts
4756:
4757: Child signal assignment:
4758: NONE
4759:
1.74 harris41 4760:
4761: =item *
4762:
4763: SIGCHLD
4764:
4765: Parent signal assignment:
4766: $SIG{CHLD} = \&REAPER;
4767:
4768: Child signal assignment:
4769: none
4770:
4771: Command-line invocations:
4772: B<kill> B<-s> SIGCHLD I<PID>
4773:
4774: Subroutine B<REAPER>:
4775: This is only invoked for the B<lond> parent I<PID>.
4776: Information pertaining to the child is removed.
4777: The socket port is cleaned up.
4778:
4779: =back
4780:
4781: B<SERVER-SIDE ACTIVITIES>
4782:
4783: Server-side information can be accepted in an encrypted or non-encrypted
4784: method.
4785:
4786: =over 4
4787:
4788: =item ping
4789:
4790: Query a client in the hosts.tab table; "Are you there?"
4791:
4792: =item pong
4793:
4794: Respond to a ping query.
4795:
4796: =item ekey
4797:
4798: Read in encrypted key, make cipher. Respond with a buildkey.
4799:
4800: =item load
4801:
4802: Respond with CPU load based on a computation upon /proc/loadavg.
4803:
4804: =item currentauth
4805:
4806: Reply with current authentication information (only over an
4807: encrypted channel).
4808:
4809: =item auth
4810:
4811: Only over an encrypted channel, reply as to whether a user's
4812: authentication information can be validated.
4813:
4814: =item passwd
4815:
4816: Allow for a password to be set.
4817:
4818: =item makeuser
4819:
4820: Make a user.
4821:
4822: =item passwd
4823:
4824: Allow for authentication mechanism and password to be changed.
4825:
4826: =item home
1.61 harris41 4827:
1.74 harris41 4828: Respond to a question "are you the home for a given user?"
4829:
4830: =item update
4831:
4832: Update contents of a subscribed resource.
4833:
4834: =item unsubscribe
4835:
4836: The server is unsubscribing from a resource.
4837:
4838: =item subscribe
4839:
4840: The server is subscribing to a resource.
4841:
4842: =item log
4843:
4844: Place in B<logs/lond.log>
4845:
4846: =item put
4847:
4848: stores hash in namespace
4849:
4850: =item rolesput
4851:
4852: put a role into a user's environment
4853:
4854: =item get
4855:
4856: returns hash with keys from array
4857: reference filled in from namespace
4858:
4859: =item eget
4860:
4861: returns hash with keys from array
4862: reference filled in from namesp (encrypts the return communication)
4863:
4864: =item rolesget
4865:
4866: get a role from a user's environment
4867:
4868: =item del
4869:
4870: deletes keys out of array from namespace
4871:
4872: =item keys
4873:
4874: returns namespace keys
4875:
4876: =item dump
4877:
4878: dumps the complete (or key matching regexp) namespace into a hash
4879:
4880: =item store
4881:
4882: stores hash permanently
4883: for this url; hashref needs to be given and should be a \%hashname; the
4884: remaining args aren't required and if they aren't passed or are '' they will
4885: be derived from the ENV
4886:
4887: =item restore
4888:
4889: returns a hash for a given url
4890:
4891: =item querysend
4892:
4893: Tells client about the lonsql process that has been launched in response
4894: to a sent query.
4895:
4896: =item queryreply
4897:
4898: Accept information from lonsql and make appropriate storage in temporary
4899: file space.
4900:
4901: =item idput
4902:
4903: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
4904: for each student, defined perhaps by the institutional Registrar.)
4905:
4906: =item idget
4907:
4908: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
4909: for each student, defined perhaps by the institutional Registrar.)
4910:
4911: =item tmpput
4912:
4913: Accept and store information in temporary space.
4914:
4915: =item tmpget
4916:
4917: Send along temporarily stored information.
4918:
4919: =item ls
4920:
4921: List part of a user's directory.
4922:
1.135 foxr 4923: =item pushtable
4924:
4925: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
4926: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
4927: must be restored manually in case of a problem with the new table file.
4928: pushtable requires that the request be encrypted and validated via
4929: ValidateManager. The form of the command is:
4930: enc:pushtable tablename <tablecontents> \n
4931: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
4932: cleartext newline.
4933:
1.74 harris41 4934: =item Hanging up (exit or init)
4935:
4936: What to do when a client tells the server that they (the client)
4937: are leaving the network.
4938:
4939: =item unknown command
4940:
4941: If B<lond> is sent an unknown command (not in the list above),
4942: it replys to the client "unknown_cmd".
1.135 foxr 4943:
1.74 harris41 4944:
4945: =item UNKNOWN CLIENT
4946:
4947: If the anti-spoofing algorithm cannot verify the client,
4948: the client is rejected (with a "refused" message sent
4949: to the client, and the connection is closed.
4950:
4951: =back
1.61 harris41 4952:
4953: =head1 PREREQUISITES
4954:
4955: IO::Socket
4956: IO::File
4957: Apache::File
4958: Symbol
4959: POSIX
4960: Crypt::IDEA
4961: LWP::UserAgent()
4962: GDBM_File
4963: Authen::Krb4
1.91 albertel 4964: Authen::Krb5
1.61 harris41 4965:
4966: =head1 COREQUISITES
4967:
4968: =head1 OSNAMES
4969:
4970: linux
4971:
4972: =head1 SCRIPT CATEGORIES
4973:
4974: Server/Process
4975:
4976: =cut
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