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