1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.180 2004/03/08 20:59:41 albertel Exp $
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
13: # the Free Software Foundation; either version 2 of the License, or
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
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27:
28:
29: # http://www.lon-capa.org/
30: #
31:
32: use strict;
33: use lib '/home/httpd/lib/perl/';
34: use LONCAPA::Configuration;
35:
36: use IO::Socket;
37: use IO::File;
38: #use Apache::File;
39: use Symbol;
40: use POSIX;
41: use Crypt::IDEA;
42: use LWP::UserAgent();
43: use GDBM_File;
44: use Authen::Krb4;
45: use Authen::Krb5;
46: use lib '/home/httpd/lib/perl/';
47: use localauth;
48: use File::Copy;
49: use LONCAPA::ConfigFileEdit;
50:
51: my $DEBUG = 0; # Non zero to enable debug log entries.
52:
53: my $status='';
54: my $lastlog='';
55:
56: my $VERSION='$Revision: 1.180 $'; #' stupid emacs
57: my $remoteVERSION;
58: my $currenthostid;
59: my $currentdomainid;
60:
61: my $client;
62: my $clientip;
63: my $clientname;
64:
65: my $server;
66: my $thisserver;
67:
68: #
69: # Connection type is:
70: # client - All client actions are allowed
71: # manager - only management functions allowed.
72: # both - Both management and client actions are allowed
73: #
74:
75: my $ConnectionType;
76:
77: my %hostid;
78: my %hostdom;
79: my %hostip;
80:
81: my %managers; # Ip -> manager names
82:
83: my %perlvar; # Will have the apache conf defined perl vars.
84:
85: #
86: # The array below are password error strings."
87: #
88: my $lastpwderror = 13; # Largest error number from lcpasswd.
89: my @passwderrors = ("ok",
90: "lcpasswd must be run as user 'www'",
91: "lcpasswd got incorrect number of arguments",
92: "lcpasswd did not get the right nubmer of input text lines",
93: "lcpasswd too many simultaneous pwd changes in progress",
94: "lcpasswd User does not exist.",
95: "lcpasswd Incorrect current passwd",
96: "lcpasswd Unable to su to root.",
97: "lcpasswd Cannot set new passwd.",
98: "lcpasswd Username has invalid characters",
99: "lcpasswd Invalid characters in password",
100: "11", "12",
101: "lcpasswd Password mismatch");
102:
103:
104: # The array below are lcuseradd error strings.:
105:
106: my $lastadderror = 13;
107: my @adderrors = ("ok",
108: "User ID mismatch, lcuseradd must run as user www",
109: "lcuseradd Incorrect number of command line parameters must be 3",
110: "lcuseradd Incorrect number of stdinput lines, must be 3",
111: "lcuseradd Too many other simultaneous pwd changes in progress",
112: "lcuseradd User does not exist",
113: "lcuseradd Unable to make www member of users's group",
114: "lcuseradd Unable to su to root",
115: "lcuseradd Unable to set password",
116: "lcuseradd Usrname has invalid characters",
117: "lcuseradd Password has an invalid character",
118: "lcuseradd User already exists",
119: "lcuseradd Could not add user.",
120: "lcuseradd Password mismatch");
121:
122:
123: #
124: # GetCertificate: Given a transaction that requires a certificate,
125: # this function will extract the certificate from the transaction
126: # request. Note that at this point, the only concept of a certificate
127: # is the hostname to which we are connected.
128: #
129: # Parameter:
130: # request - The request sent by our client (this parameterization may
131: # need to change when we really use a certificate granting
132: # authority.
133: #
134: sub GetCertificate {
135: my $request = shift;
136:
137: return $clientip;
138: }
139:
140: #
141: # Return true if client is a manager.
142: #
143: sub isManager {
144: return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
145: }
146: #
147: # Return tru if client can do client functions
148: #
149: sub isClient {
150: return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
151: }
152:
153:
154: #
155: # ReadManagerTable: Reads in the current manager table. For now this is
156: # done on each manager authentication because:
157: # - These authentications are not frequent
158: # - This allows dynamic changes to the manager table
159: # without the need to signal to the lond.
160: #
161:
162: sub ReadManagerTable {
163:
164: # Clean out the old table first..
165:
166: foreach my $key (keys %managers) {
167: delete $managers{$key};
168: }
169:
170: my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
171: if (!open (MANAGERS, $tablename)) {
172: logthis('<font color="red">No manager table. Nobody can manage!!</font>');
173: return;
174: }
175: while(my $host = <MANAGERS>) {
176: chomp($host);
177: if ($host =~ "^#") { # Comment line.
178: logthis('<font color="green"> Skipping line: '. "$host</font>\n");
179: next;
180: }
181: if (!defined $hostip{$host}) { # This is a non cluster member
182: # The entry is of the form:
183: # cluname:hostname
184: # cluname - A 'cluster hostname' is needed in order to negotiate
185: # the host key.
186: # hostname- The dns name of the host.
187: #
188: my($cluname, $dnsname) = split(/:/, $host);
189:
190: my $ip = gethostbyname($dnsname);
191: if(defined($ip)) { # bad names don't deserve entry.
192: my $hostip = inet_ntoa($ip);
193: $managers{$hostip} = $cluname;
194: logthis('<font color="green"> registering manager '.
195: "$dnsname as $cluname with $hostip </font>\n");
196: }
197: } else {
198: logthis('<font color="green"> existing host'." $host</font>\n");
199: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber
200: }
201: }
202: }
203:
204: #
205: # ValidManager: Determines if a given certificate represents a valid manager.
206: # in this primitive implementation, the 'certificate' is
207: # just the connecting loncapa client name. This is checked
208: # against a valid client list in the configuration.
209: #
210: #
211: sub ValidManager {
212: my $certificate = shift;
213:
214: return isManager;
215: }
216: #
217: # CopyFile: Called as part of the process of installing a
218: # new configuration file. This function copies an existing
219: # file to a backup file.
220: # Parameters:
221: # oldfile - Name of the file to backup.
222: # newfile - Name of the backup file.
223: # Return:
224: # 0 - Failure (errno has failure reason).
225: # 1 - Success.
226: #
227: sub CopyFile {
228: my $oldfile = shift;
229: my $newfile = shift;
230:
231: # The file must exist:
232:
233: if(-e $oldfile) {
234:
235: # Read the old file.
236:
237: my $oldfh = IO::File->new("< $oldfile");
238: if(!$oldfh) {
239: return 0;
240: }
241: my @contents = <$oldfh>; # Suck in the entire file.
242:
243: # write the backup file:
244:
245: my $newfh = IO::File->new("> $newfile");
246: if(!(defined $newfh)){
247: return 0;
248: }
249: my $lines = scalar @contents;
250: for (my $i =0; $i < $lines; $i++) {
251: print $newfh ($contents[$i]);
252: }
253:
254: $oldfh->close;
255: $newfh->close;
256:
257: chmod(0660, $newfile);
258:
259: return 1;
260:
261: } else {
262: return 0;
263: }
264: }
265: #
266: # Host files are passed out with externally visible host IPs.
267: # If, for example, we are behind a fire-wall or NAT host, our
268: # internally visible IP may be different than the externally
269: # visible IP. Therefore, we always adjust the contents of the
270: # host file so that the entry for ME is the IP that we believe
271: # we have. At present, this is defined as the entry that
272: # DNS has for us. If by some chance we are not able to get a
273: # DNS translation for us, then we assume that the host.tab file
274: # is correct.
275: # BUGBUGBUG - in the future, we really should see if we can
276: # easily query the interface(s) instead.
277: # Parameter(s):
278: # contents - The contents of the host.tab to check.
279: # Returns:
280: # newcontents - The adjusted contents.
281: #
282: #
283: sub AdjustHostContents {
284: my $contents = shift;
285: my $adjusted;
286: my $me = $perlvar{'lonHostID'};
287:
288: foreach my $line (split(/\n/,$contents)) {
289: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
290: chomp($line);
291: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
292: if ($id eq $me) {
293: my $ip = gethostbyname($name);
294: my $ipnew = inet_ntoa($ip);
295: $ip = $ipnew;
296: # Reconstruct the host line and append to adjusted:
297:
298: my $newline = "$id:$domain:$role:$name:$ip";
299: if($maxcon ne "") { # Not all hosts have loncnew tuning params
300: $newline .= ":$maxcon:$idleto:$mincon";
301: }
302: $adjusted .= $newline."\n";
303:
304: } else { # Not me, pass unmodified.
305: $adjusted .= $line."\n";
306: }
307: } else { # Blank or comment never re-written.
308: $adjusted .= $line."\n"; # Pass blanks and comments as is.
309: }
310: }
311: return $adjusted;
312: }
313: #
314: # InstallFile: Called to install an administrative file:
315: # - The file is created with <name>.tmp
316: # - The <name>.tmp file is then mv'd to <name>
317: # This lugubrious procedure is done to ensure that we are never without
318: # a valid, even if dated, version of the file regardless of who crashes
319: # and when the crash occurs.
320: #
321: # Parameters:
322: # Name of the file
323: # File Contents.
324: # Return:
325: # nonzero - success.
326: # 0 - failure and $! has an errno.
327: #
328: sub InstallFile {
329: my $Filename = shift;
330: my $Contents = shift;
331: my $TempFile = $Filename.".tmp";
332:
333: # Open the file for write:
334:
335: my $fh = IO::File->new("> $TempFile"); # Write to temp.
336: if(!(defined $fh)) {
337: &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
338: return 0;
339: }
340: # write the contents of the file:
341:
342: print $fh ($Contents);
343: $fh->close; # In case we ever have a filesystem w. locking
344:
345: chmod(0660, $TempFile);
346:
347: # Now we can move install the file in position.
348:
349: move($TempFile, $Filename);
350:
351: return 1;
352: }
353: #
354: # ConfigFileFromSelector: converts a configuration file selector
355: # (one of host or domain at this point) into a
356: # configuration file pathname.
357: #
358: # Parameters:
359: # selector - Configuration file selector.
360: # Returns:
361: # Full path to the file or undef if the selector is invalid.
362: #
363: sub ConfigFileFromSelector {
364: my $selector = shift;
365: my $tablefile;
366:
367: my $tabledir = $perlvar{'lonTabDir'}.'/';
368: if ($selector eq "hosts") {
369: $tablefile = $tabledir."hosts.tab";
370: } elsif ($selector eq "domain") {
371: $tablefile = $tabledir."domain.tab";
372: } else {
373: return undef;
374: }
375: return $tablefile;
376:
377: }
378: #
379: # PushFile: Called to do an administrative push of a file.
380: # - Ensure the file being pushed is one we support.
381: # - Backup the old file to <filename.saved>
382: # - Separate the contents of the new file out from the
383: # rest of the request.
384: # - Write the new file.
385: # Parameter:
386: # Request - The entire user request. This consists of a : separated
387: # string pushfile:tablename:contents.
388: # NOTE: The contents may have :'s in it as well making things a bit
389: # more interesting... but not much.
390: # Returns:
391: # String to send to client ("ok" or "refused" if bad file).
392: #
393: sub PushFile {
394: my $request = shift;
395: my ($command, $filename, $contents) = split(":", $request, 3);
396:
397: # At this point in time, pushes for only the following tables are
398: # supported:
399: # hosts.tab ($filename eq host).
400: # domain.tab ($filename eq domain).
401: # Construct the destination filename or reject the request.
402: #
403: # lonManage is supposed to ensure this, however this session could be
404: # part of some elaborate spoof that managed somehow to authenticate.
405: #
406:
407:
408: my $tablefile = ConfigFileFromSelector($filename);
409: if(! (defined $tablefile)) {
410: return "refused";
411: }
412: #
413: # >copy< the old table to the backup table
414: # don't rename in case system crashes/reboots etc. in the time
415: # window between a rename and write.
416: #
417: my $backupfile = $tablefile;
418: $backupfile =~ s/\.tab$/.old/;
419: if(!CopyFile($tablefile, $backupfile)) {
420: &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
421: return "error:$!";
422: }
423: &logthis('<font color="green"> Pushfile: backed up '
424: .$tablefile." to $backupfile</font>");
425:
426: # If the file being pushed is the host file, we adjust the entry for ourself so that the
427: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible
428: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a
429: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
430: # that possibilty.
431:
432: if($filename eq "host") {
433: $contents = AdjustHostContents($contents);
434: }
435:
436: # Install the new file:
437:
438: if(!InstallFile($tablefile, $contents)) {
439: &logthis('<font color="red"> Pushfile: unable to install '
440: .$tablefile." $! </font>");
441: return "error:$!";
442: }
443: else {
444: &logthis('<font color="green"> Installed new '.$tablefile
445: ."</font>");
446:
447: }
448:
449:
450: # Indicate success:
451:
452: return "ok";
453:
454: }
455:
456: #
457: # Called to re-init either lonc or lond.
458: #
459: # Parameters:
460: # request - The full request by the client. This is of the form
461: # reinit:<process>
462: # where <process> is allowed to be either of
463: # lonc or lond
464: #
465: # Returns:
466: # The string to be sent back to the client either:
467: # ok - Everything worked just fine.
468: # error:why - There was a failure and why describes the reason.
469: #
470: #
471: sub ReinitProcess {
472: my $request = shift;
473:
474:
475: # separate the request (reinit) from the process identifier and
476: # validate it producing the name of the .pid file for the process.
477: #
478: #
479: my ($junk, $process) = split(":", $request);
480: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
481: if($process eq 'lonc') {
482: $processpidfile = $processpidfile."lonc.pid";
483: if (!open(PIDFILE, "< $processpidfile")) {
484: return "error:Open failed for $processpidfile";
485: }
486: my $loncpid = <PIDFILE>;
487: close(PIDFILE);
488: logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
489: ."</font>");
490: kill("USR2", $loncpid);
491: } elsif ($process eq 'lond') {
492: logthis('<font color="red"> Reinitializing self (lond) </font>');
493: &UpdateHosts; # Lond is us!!
494: } else {
495: &logthis('<font color="yellow" Invalid reinit request for '.$process
496: ."</font>");
497: return "error:Invalid process identifier $process";
498: }
499: return 'ok';
500: }
501: # Validate a line in a configuration file edit script:
502: # Validation includes:
503: # - Ensuring the command is valid.
504: # - Ensuring the command has sufficient parameters
505: # Parameters:
506: # scriptline - A line to validate (\n has been stripped for what it's worth).
507: #
508: # Return:
509: # 0 - Invalid scriptline.
510: # 1 - Valid scriptline
511: # NOTE:
512: # Only the command syntax is checked, not the executability of the
513: # command.
514: #
515: sub isValidEditCommand {
516: my $scriptline = shift;
517:
518: # Line elements are pipe separated:
519:
520: my ($command, $key, $newline) = split(/\|/, $scriptline);
521: &logthis('<font color="green"> isValideditCommand checking: '.
522: "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
523:
524: if ($command eq "delete") {
525: #
526: # key with no newline.
527: #
528: if( ($key eq "") || ($newline ne "")) {
529: return 0; # Must have key but no newline.
530: } else {
531: return 1; # Valid syntax.
532: }
533: } elsif ($command eq "replace") {
534: #
535: # key and newline:
536: #
537: if (($key eq "") || ($newline eq "")) {
538: return 0;
539: } else {
540: return 1;
541: }
542: } elsif ($command eq "append") {
543: if (($key ne "") && ($newline eq "")) {
544: return 1;
545: } else {
546: return 0;
547: }
548: } else {
549: return 0; # Invalid command.
550: }
551: return 0; # Should not get here!!!
552: }
553: #
554: # ApplyEdit - Applies an edit command to a line in a configuration
555: # file. It is the caller's responsiblity to validate the
556: # edit line.
557: # Parameters:
558: # $directive - A single edit directive to apply.
559: # Edit directives are of the form:
560: # append|newline - Appends a new line to the file.
561: # replace|key|newline - Replaces the line with key value 'key'
562: # delete|key - Deletes the line with key value 'key'.
563: # $editor - A config file editor object that contains the
564: # file being edited.
565: #
566: sub ApplyEdit {
567: my $directive = shift;
568: my $editor = shift;
569:
570: # Break the directive down into its command and its parameters
571: # (at most two at this point. The meaning of the parameters, if in fact
572: # they exist depends on the command).
573:
574: my ($command, $p1, $p2) = split(/\|/, $directive);
575:
576: if($command eq "append") {
577: $editor->Append($p1); # p1 - key p2 null.
578: } elsif ($command eq "replace") {
579: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline.
580: } elsif ($command eq "delete") {
581: $editor->DeleteLine($p1); # p1 - key p2 null.
582: } else { # Should not get here!!!
583: die "Invalid command given to ApplyEdit $command"
584: }
585: }
586: #
587: # AdjustOurHost:
588: # Adjusts a host file stored in a configuration file editor object
589: # for the true IP address of this host. This is necessary for hosts
590: # that live behind a firewall.
591: # Those hosts have a publicly distributed IP of the firewall, but
592: # internally must use their actual IP. We assume that a given
593: # host only has a single IP interface for now.
594: # Formal Parameters:
595: # editor - The configuration file editor to adjust. This
596: # editor is assumed to contain a hosts.tab file.
597: # Strategy:
598: # - Figure out our hostname.
599: # - Lookup the entry for this host.
600: # - Modify the line to contain our IP
601: # - Do a replace for this host.
602: sub AdjustOurHost {
603: my $editor = shift;
604:
605: # figure out who I am.
606:
607: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname.
608:
609: # Get my host file entry.
610:
611: my $ConfigLine = $editor->Find($myHostName);
612: if(! (defined $ConfigLine)) {
613: die "AdjustOurHost - no entry for me in hosts file $myHostName";
614: }
615: # figure out my IP:
616: # Use the config line to get my hostname.
617: # Use gethostbyname to translate that into an IP address.
618: #
619: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
620: my $BinaryIp = gethostbyname($name);
621: my $ip = inet_ntoa($ip);
622: #
623: # Reassemble the config line from the elements in the list.
624: # Note that if the loncnew items were not present before, they will
625: # be now even if they would be empty
626: #
627: my $newConfigLine = $id;
628: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
629: $newConfigLine .= ":".$item;
630: }
631: # Replace the line:
632:
633: $editor->ReplaceLine($id, $newConfigLine);
634:
635: }
636: #
637: # ReplaceConfigFile:
638: # Replaces a configuration file with the contents of a
639: # configuration file editor object.
640: # This is done by:
641: # - Copying the target file to <filename>.old
642: # - Writing the new file to <filename>.tmp
643: # - Moving <filename.tmp> -> <filename>
644: # This laborious process ensures that the system is never without
645: # a configuration file that's at least valid (even if the contents
646: # may be dated).
647: # Parameters:
648: # filename - Name of the file to modify... this is a full path.
649: # editor - Editor containing the file.
650: #
651: sub ReplaceConfigFile {
652: my $filename = shift;
653: my $editor = shift;
654:
655: CopyFile ($filename, $filename.".old");
656:
657: my $contents = $editor->Get(); # Get the contents of the file.
658:
659: InstallFile($filename, $contents);
660: }
661: #
662: #
663: # Called to edit a configuration table file
664: # Parameters:
665: # request - The entire command/request sent by lonc or lonManage
666: # Return:
667: # The reply to send to the client.
668: #
669: sub EditFile {
670: my $request = shift;
671:
672: # Split the command into it's pieces: edit:filetype:script
673:
674: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script
675:
676: # Check the pre-coditions for success:
677:
678: if($request != "edit") { # Something is amiss afoot alack.
679: return "error:edit request detected, but request != 'edit'\n";
680: }
681: if( ($filetype ne "hosts") &&
682: ($filetype ne "domain")) {
683: return "error:edit requested with invalid file specifier: $filetype \n";
684: }
685:
686: # Split the edit script and check it's validity.
687:
688: my @scriptlines = split(/\n/, $script); # one line per element.
689: my $linecount = scalar(@scriptlines);
690: for(my $i = 0; $i < $linecount; $i++) {
691: chomp($scriptlines[$i]);
692: if(!isValidEditCommand($scriptlines[$i])) {
693: return "error:edit with bad script line: '$scriptlines[$i]' \n";
694: }
695: }
696:
697: # Execute the edit operation.
698: # - Create a config file editor for the appropriate file and
699: # - execute each command in the script:
700: #
701: my $configfile = ConfigFileFromSelector($filetype);
702: if (!(defined $configfile)) {
703: return "refused\n";
704: }
705: my $editor = ConfigFileEdit->new($configfile);
706:
707: for (my $i = 0; $i < $linecount; $i++) {
708: ApplyEdit($scriptlines[$i], $editor);
709: }
710: # If the file is the host file, ensure that our host is
711: # adjusted to have our ip:
712: #
713: if($filetype eq "host") {
714: AdjustOurHost($editor);
715: }
716: # Finally replace the current file with our file.
717: #
718: ReplaceConfigFile($configfile, $editor);
719:
720: return "ok\n";
721: }
722: #
723: # Convert an error return code from lcpasswd to a string value.
724: #
725: sub lcpasswdstrerror {
726: my $ErrorCode = shift;
727: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
728: return "lcpasswd Unrecognized error return value ".$ErrorCode;
729: } else {
730: return $passwderrors[$ErrorCode];
731: }
732: }
733:
734: #
735: # Convert an error return code from lcuseradd to a string value:
736: #
737: sub lcuseraddstrerror {
738: my $ErrorCode = shift;
739: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
740: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
741: } else {
742: return $adderrors[$ErrorCode];
743: }
744: }
745:
746: # grabs exception and records it to log before exiting
747: sub catchexception {
748: my ($error)=@_;
749: $SIG{'QUIT'}='DEFAULT';
750: $SIG{__DIE__}='DEFAULT';
751: &status("Catching exception");
752: &logthis("<font color=red>CRITICAL: "
753: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
754: ."a crash with this error msg->[$error]</font>");
755: &logthis('Famous last words: '.$status.' - '.$lastlog);
756: if ($client) { print $client "error: $error\n"; }
757: $server->close();
758: die($error);
759: }
760:
761: sub timeout {
762: &status("Handling Timeout");
763: &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
764: &catchexception('Timeout');
765: }
766: # -------------------------------- Set signal handlers to record abnormal exits
767:
768: $SIG{'QUIT'}=\&catchexception;
769: $SIG{__DIE__}=\&catchexception;
770:
771: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
772: &status("Read loncapa.conf and loncapa_apache.conf");
773: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
774: %perlvar=%{$perlvarref};
775: undef $perlvarref;
776:
777: # ----------------------------- Make sure this process is running from user=www
778: my $wwwid=getpwnam('www');
779: if ($wwwid!=$<) {
780: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
781: my $subj="LON: $currenthostid User ID mismatch";
782: system("echo 'User ID mismatch. lond must be run as user www.' |\
783: mailto $emailto -s '$subj' > /dev/null");
784: exit 1;
785: }
786:
787: # --------------------------------------------- Check if other instance running
788:
789: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
790:
791: if (-e $pidfile) {
792: my $lfh=IO::File->new("$pidfile");
793: my $pide=<$lfh>;
794: chomp($pide);
795: if (kill 0 => $pide) { die "already running"; }
796: }
797:
798: # ------------------------------------------------------------- Read hosts file
799:
800:
801:
802: # establish SERVER socket, bind and listen.
803: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
804: Type => SOCK_STREAM,
805: Proto => 'tcp',
806: Reuse => 1,
807: Listen => 10 )
808: or die "making socket: $@\n";
809:
810: # --------------------------------------------------------- Do global variables
811:
812: # global variables
813:
814: my %children = (); # keys are current child process IDs
815:
816: sub REAPER { # takes care of dead children
817: $SIG{CHLD} = \&REAPER;
818: &status("Handling child death");
819: my $pid;
820: do {
821: $pid = waitpid(-1,&WNOHANG());
822: if (defined($children{$pid})) {
823: &logthis("Child $pid died");
824: delete($children{$pid});
825: } else {
826: &logthis("Unknown Child $pid died");
827: }
828: } while ( $pid > 0 );
829: foreach my $child (keys(%children)) {
830: $pid = waitpid($child,&WNOHANG());
831: if ($pid > 0) {
832: &logthis("Child $child - $pid looks like we missed it's death");
833: delete($children{$pid});
834: }
835: }
836: &status("Finished Handling child death");
837: }
838:
839: sub HUNTSMAN { # signal handler for SIGINT
840: &status("Killing children (INT)");
841: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
842: kill 'INT' => keys %children;
843: &logthis("Free socket: ".shutdown($server,2)); # free up socket
844: my $execdir=$perlvar{'lonDaemons'};
845: unlink("$execdir/logs/lond.pid");
846: &logthis("<font color=red>CRITICAL: Shutting down</font>");
847: &status("Done killing children");
848: exit; # clean up with dignity
849: }
850:
851: sub HUPSMAN { # signal handler for SIGHUP
852: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
853: &status("Killing children for restart (HUP)");
854: kill 'INT' => keys %children;
855: &logthis("Free socket: ".shutdown($server,2)); # free up socket
856: &logthis("<font color=red>CRITICAL: Restarting</font>");
857: my $execdir=$perlvar{'lonDaemons'};
858: unlink("$execdir/logs/lond.pid");
859: &status("Restarting self (HUP)");
860: exec("$execdir/lond"); # here we go again
861: }
862:
863: #
864: # Kill off hashes that describe the host table prior to re-reading it.
865: # Hashes affected are:
866: # %hostid, %hostdom %hostip
867: #
868: sub KillHostHashes {
869: foreach my $key (keys %hostid) {
870: delete $hostid{$key};
871: }
872: foreach my $key (keys %hostdom) {
873: delete $hostdom{$key};
874: }
875: foreach my $key (keys %hostip) {
876: delete $hostip{$key};
877: }
878: }
879: #
880: # Read in the host table from file and distribute it into the various hashes:
881: #
882: # - %hostid - Indexed by IP, the loncapa hostname.
883: # - %hostdom - Indexed by loncapa hostname, the domain.
884: # - %hostip - Indexed by hostid, the Ip address of the host.
885: sub ReadHostTable {
886:
887: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
888:
889: while (my $configline=<CONFIG>) {
890: if (!($configline =~ /^\s*\#/)) {
891: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
892: chomp($ip); $ip=~s/\D+$//;
893: $hostid{$ip}=$id;
894: $hostdom{$id}=$domain;
895: $hostip{$id}=$ip;
896: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
897: }
898: }
899: close(CONFIG);
900: }
901: #
902: # Reload the Apache daemon's state.
903: # This is done by invoking /home/httpd/perl/apachereload
904: # a setuid perl script that can be root for us to do this job.
905: #
906: sub ReloadApache {
907: my $execdir = $perlvar{'lonDaemons'};
908: my $script = $execdir."/apachereload";
909: system($script);
910: }
911:
912: #
913: # Called in response to a USR2 signal.
914: # - Reread hosts.tab
915: # - All children connected to hosts that were removed from hosts.tab
916: # are killed via SIGINT
917: # - All children connected to previously existing hosts are sent SIGUSR1
918: # - Our internal hosts hash is updated to reflect the new contents of
919: # hosts.tab causing connections from hosts added to hosts.tab to
920: # now be honored.
921: #
922: sub UpdateHosts {
923: &status("Reload hosts.tab");
924: logthis('<font color="blue"> Updating connections </font>');
925: #
926: # The %children hash has the set of IP's we currently have children
927: # on. These need to be matched against records in the hosts.tab
928: # Any ip's no longer in the table get killed off they correspond to
929: # either dropped or changed hosts. Note that the re-read of the table
930: # will take care of new and changed hosts as connections come into being.
931:
932:
933: KillHostHashes;
934: ReadHostTable;
935:
936: foreach my $child (keys %children) {
937: my $childip = $children{$child};
938: if(!$hostid{$childip}) {
939: logthis('<font color="blue"> UpdateHosts killing child '
940: ." $child for ip $childip </font>");
941: kill('INT', $child);
942: } else {
943: logthis('<font color="green"> keeping child for ip '
944: ." $childip (pid=$child) </font>");
945: }
946: }
947: ReloadApache;
948: &status("Finished reloading hosts.tab");
949: }
950:
951:
952: sub checkchildren {
953: &status("Checking on the children (sending signals)");
954: &initnewstatus();
955: &logstatus();
956: &logthis('Going to check on the children');
957: my $docdir=$perlvar{'lonDocRoot'};
958: foreach (sort keys %children) {
959: sleep 1;
960: unless (kill 'USR1' => $_) {
961: &logthis ('Child '.$_.' is dead');
962: &logstatus($$.' is dead');
963: }
964: }
965: sleep 5;
966: $SIG{ALRM} = sub { die "timeout" };
967: $SIG{__DIE__} = 'DEFAULT';
968: &status("Checking on the children (waiting for reports)");
969: foreach (sort keys %children) {
970: unless (-e "$docdir/lon-status/londchld/$_.txt") {
971: eval {
972: alarm(300);
973: &logthis('Child '.$_.' did not respond');
974: kill 9 => $_;
975: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
976: #$subj="LON: $currenthostid killed lond process $_";
977: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
978: #$execdir=$perlvar{'lonDaemons'};
979: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
980: alarm(0);
981: }
982: }
983: }
984: $SIG{ALRM} = 'DEFAULT';
985: $SIG{__DIE__} = \&catchexception;
986: &status("Finished checking children");
987: }
988:
989: # --------------------------------------------------------------------- Logging
990:
991: sub logthis {
992: my $message=shift;
993: my $execdir=$perlvar{'lonDaemons'};
994: my $fh=IO::File->new(">>$execdir/logs/lond.log");
995: my $now=time;
996: my $local=localtime($now);
997: $lastlog=$local.': '.$message;
998: print $fh "$local ($$): $message\n";
999: }
1000:
1001: # ------------------------- Conditional log if $DEBUG true.
1002: sub Debug {
1003: my $message = shift;
1004: if($DEBUG) {
1005: &logthis($message);
1006: }
1007: }
1008:
1009: #
1010: # Sub to do replies to client.. this gives a hook for some
1011: # debug tracing too:
1012: # Parameters:
1013: # fd - File open on client.
1014: # reply - Text to send to client.
1015: # request - Original request from client.
1016: #
1017: sub Reply {
1018: my $fd = shift;
1019: my $reply = shift;
1020: my $request = shift;
1021:
1022: print $fd $reply;
1023: Debug("Request was $request Reply was $reply");
1024:
1025: }
1026: # ------------------------------------------------------------------ Log status
1027:
1028: sub logstatus {
1029: &status("Doing logging");
1030: my $docdir=$perlvar{'lonDocRoot'};
1031: {
1032: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
1033: print $fh $$."\t".$clientname."\t".$currenthostid."\t".$status."\t".$lastlog."\n";
1034: $fh->close();
1035: }
1036: &status("Finished londstatus.txt");
1037: {
1038: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
1039: print $fh $status."\n".$lastlog."\n".time;
1040: $fh->close();
1041: }
1042: &status("Finished logging");
1043: }
1044:
1045: sub initnewstatus {
1046: my $docdir=$perlvar{'lonDocRoot'};
1047: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
1048: my $now=time;
1049: my $local=localtime($now);
1050: print $fh "LOND status $local - parent $$\n\n";
1051: opendir(DIR,"$docdir/lon-status/londchld");
1052: while (my $filename=readdir(DIR)) {
1053: unlink("$docdir/lon-status/londchld/$filename");
1054: }
1055: closedir(DIR);
1056: }
1057:
1058: # -------------------------------------------------------------- Status setting
1059:
1060: sub status {
1061: my $what=shift;
1062: my $now=time;
1063: my $local=localtime($now);
1064: $status=$local.': '.$what;
1065: $0='lond: '.$what.' '.$local;
1066: }
1067:
1068: # -------------------------------------------------------- Escape Special Chars
1069:
1070: sub escape {
1071: my $str=shift;
1072: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
1073: return $str;
1074: }
1075:
1076: # ----------------------------------------------------- Un-Escape Special Chars
1077:
1078: sub unescape {
1079: my $str=shift;
1080: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
1081: return $str;
1082: }
1083:
1084: # ----------------------------------------------------------- Send USR1 to lonc
1085:
1086: sub reconlonc {
1087: my $peerfile=shift;
1088: &logthis("Trying to reconnect for $peerfile");
1089: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
1090: if (my $fh=IO::File->new("$loncfile")) {
1091: my $loncpid=<$fh>;
1092: chomp($loncpid);
1093: if (kill 0 => $loncpid) {
1094: &logthis("lonc at pid $loncpid responding, sending USR1");
1095: kill USR1 => $loncpid;
1096: } else {
1097: &logthis(
1098: "<font color=red>CRITICAL: "
1099: ."lonc at pid $loncpid not responding, giving up</font>");
1100: }
1101: } else {
1102: &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
1103: }
1104: }
1105:
1106: # -------------------------------------------------- Non-critical communication
1107:
1108: sub subreply {
1109: my ($cmd,$server)=@_;
1110: my $peerfile="$perlvar{'lonSockDir'}/$server";
1111: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
1112: Type => SOCK_STREAM,
1113: Timeout => 10)
1114: or return "con_lost";
1115: print $sclient "$cmd\n";
1116: my $answer=<$sclient>;
1117: chomp($answer);
1118: if (!$answer) { $answer="con_lost"; }
1119: return $answer;
1120: }
1121:
1122: sub reply {
1123: my ($cmd,$server)=@_;
1124: my $answer;
1125: if ($server ne $currenthostid) {
1126: $answer=subreply($cmd,$server);
1127: if ($answer eq 'con_lost') {
1128: $answer=subreply("ping",$server);
1129: if ($answer ne $server) {
1130: &logthis("sub reply: answer != server answer is $answer, server is $server");
1131: &reconlonc("$perlvar{'lonSockDir'}/$server");
1132: }
1133: $answer=subreply($cmd,$server);
1134: }
1135: } else {
1136: $answer='self_reply';
1137: }
1138: return $answer;
1139: }
1140:
1141: # -------------------------------------------------------------- Talk to lonsql
1142:
1143: sub sqlreply {
1144: my ($cmd)=@_;
1145: my $answer=subsqlreply($cmd);
1146: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
1147: return $answer;
1148: }
1149:
1150: sub subsqlreply {
1151: my ($cmd)=@_;
1152: my $unixsock="mysqlsock";
1153: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
1154: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
1155: Type => SOCK_STREAM,
1156: Timeout => 10)
1157: or return "con_lost";
1158: print $sclient "$cmd\n";
1159: my $answer=<$sclient>;
1160: chomp($answer);
1161: if (!$answer) { $answer="con_lost"; }
1162: return $answer;
1163: }
1164:
1165: # -------------------------------------------- Return path to profile directory
1166:
1167: sub propath {
1168: my ($udom,$uname)=@_;
1169: $udom=~s/\W//g;
1170: $uname=~s/\W//g;
1171: my $subdir=$uname.'__';
1172: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
1173: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
1174: return $proname;
1175: }
1176:
1177: # --------------------------------------- Is this the home server of an author?
1178:
1179: sub ishome {
1180: my $author=shift;
1181: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
1182: my ($udom,$uname)=split(/\//,$author);
1183: my $proname=propath($udom,$uname);
1184: if (-e $proname) {
1185: return 'owner';
1186: } else {
1187: return 'not_owner';
1188: }
1189: }
1190:
1191: # ======================================================= Continue main program
1192: # ---------------------------------------------------- Fork once and dissociate
1193:
1194: my $fpid=fork;
1195: exit if $fpid;
1196: die "Couldn't fork: $!" unless defined ($fpid);
1197:
1198: POSIX::setsid() or die "Can't start new session: $!";
1199:
1200: # ------------------------------------------------------- Write our PID on disk
1201:
1202: my $execdir=$perlvar{'lonDaemons'};
1203: open (PIDSAVE,">$execdir/logs/lond.pid");
1204: print PIDSAVE "$$\n";
1205: close(PIDSAVE);
1206: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
1207: &status('Starting');
1208:
1209:
1210:
1211: # ----------------------------------------------------- Install signal handlers
1212:
1213:
1214: $SIG{CHLD} = \&REAPER;
1215: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
1216: $SIG{HUP} = \&HUPSMAN;
1217: $SIG{USR1} = \&checkchildren;
1218: $SIG{USR2} = \&UpdateHosts;
1219:
1220: # Read the host hashes:
1221:
1222: ReadHostTable;
1223:
1224: # --------------------------------------------------------------
1225: # Accept connections. When a connection comes in, it is validated
1226: # and if good, a child process is created to process transactions
1227: # along the connection.
1228:
1229: while (1) {
1230: &status('Starting accept');
1231: $client = $server->accept() or next;
1232: &status('Accepted '.$client.' off to spawn');
1233: make_new_child($client);
1234: &status('Finished spawning');
1235: }
1236:
1237: sub make_new_child {
1238: my $pid;
1239: my $cipher;
1240: my $sigset;
1241:
1242: $client = shift;
1243: &status('Starting new child '.$client);
1244: &logthis('<font color="green"> Attempting to start child ('.$client.
1245: ")</font>");
1246: # block signal for fork
1247: $sigset = POSIX::SigSet->new(SIGINT);
1248: sigprocmask(SIG_BLOCK, $sigset)
1249: or die "Can't block SIGINT for fork: $!\n";
1250:
1251: die "fork: $!" unless defined ($pid = fork);
1252:
1253: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
1254: # connection liveness.
1255:
1256: #
1257: # Figure out who we're talking to so we can record the peer in
1258: # the pid hash.
1259: #
1260: my $caller = getpeername($client);
1261: my ($port,$iaddr);
1262: if (defined($caller) && length($caller) > 0) {
1263: ($port,$iaddr)=unpack_sockaddr_in($caller);
1264: } else {
1265: &logthis("Unable to determine who caller was, getpeername returned nothing");
1266: }
1267: if (defined($iaddr)) {
1268: $clientip=inet_ntoa($iaddr);
1269: } else {
1270: &logthis("Unable to determine clinetip");
1271: $clientip='Unavailable';
1272: }
1273:
1274: if ($pid) {
1275: # Parent records the child's birth and returns.
1276: sigprocmask(SIG_UNBLOCK, $sigset)
1277: or die "Can't unblock SIGINT for fork: $!\n";
1278: $children{$pid} = $clientip;
1279: &status('Started child '.$pid);
1280: return;
1281: } else {
1282: # Child can *not* return from this subroutine.
1283: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
1284: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
1285: #don't get intercepted
1286: $SIG{USR1}= \&logstatus;
1287: $SIG{ALRM}= \&timeout;
1288: $lastlog='Forked ';
1289: $status='Forked';
1290:
1291: # unblock signals
1292: sigprocmask(SIG_UNBLOCK, $sigset)
1293: or die "Can't unblock SIGINT for fork: $!\n";
1294:
1295: my $tmpsnum=0;
1296: #---------------------------------------------------- kerberos 5 initialization
1297: &Authen::Krb5::init_context();
1298: &Authen::Krb5::init_ets();
1299:
1300: &status('Accepted connection');
1301: # =============================================================================
1302: # do something with the connection
1303: # -----------------------------------------------------------------------------
1304: # see if we know client and check for spoof IP by challenge
1305:
1306: ReadManagerTable; # May also be a manager!!
1307:
1308: my $clientrec=($hostid{$clientip} ne undef);
1309: my $ismanager=($managers{$clientip} ne undef);
1310: $clientname = "[unknonwn]";
1311: if($clientrec) { # Establish client type.
1312: $ConnectionType = "client";
1313: $clientname = $hostid{$clientip};
1314: if($ismanager) {
1315: $ConnectionType = "both";
1316: }
1317: } else {
1318: $ConnectionType = "manager";
1319: $clientname = $managers{$clientip};
1320: }
1321: my $clientok;
1322: if ($clientrec || $ismanager) {
1323: &status("Waiting for init from $clientip $clientname");
1324: &logthis('<font color="yellow">INFO: Connection, '.
1325: $clientip.
1326: " ($clientname) connection type = $ConnectionType </font>" );
1327: &status("Connecting $clientip ($clientname))");
1328: my $remotereq=<$client>;
1329: $remotereq=~s/[^\w:]//g;
1330: if ($remotereq =~ /^init/) {
1331: &sethost("sethost:$perlvar{'lonHostID'}");
1332: my $challenge="$$".time;
1333: print $client "$challenge\n";
1334: &status(
1335: "Waiting for challenge reply from $clientip ($clientname)");
1336: $remotereq=<$client>;
1337: $remotereq=~s/\W//g;
1338: if ($challenge eq $remotereq) {
1339: $clientok=1;
1340: print $client "ok\n";
1341: } else {
1342: &logthis(
1343: "<font color=blue>WARNING: $clientip did not reply challenge</font>");
1344: &status('No challenge reply '.$clientip);
1345: }
1346: } else {
1347: &logthis(
1348: "<font color=blue>WARNING: "
1349: ."$clientip failed to initialize: >$remotereq< </font>");
1350: &status('No init '.$clientip);
1351: }
1352: } else {
1353: &logthis(
1354: "<font color=blue>WARNING: Unknown client $clientip</font>");
1355: &status('Hung up on '.$clientip);
1356: }
1357: if ($clientok) {
1358: # ---------------- New known client connecting, could mean machine online again
1359:
1360: foreach my $id (keys(%hostip)) {
1361: if ($hostip{$id} ne $clientip ||
1362: $hostip{$currenthostid} eq $clientip) {
1363: # no need to try to do recon's to myself
1364: next;
1365: }
1366: &reconlonc("$perlvar{'lonSockDir'}/$id");
1367: }
1368: &logthis("<font color=green>Established connection: $clientname</font>");
1369: &status('Will listen to '.$clientname);
1370: # ------------------------------------------------------------ Process requests
1371: while (my $userinput=<$client>) {
1372: chomp($userinput);
1373: Debug("Request = $userinput\n");
1374: &status('Processing '.$clientname.': '.$userinput);
1375: my $wasenc=0;
1376: alarm(120);
1377: # ------------------------------------------------------------ See if encrypted
1378: if ($userinput =~ /^enc/) {
1379: if ($cipher) {
1380: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
1381: $userinput='';
1382: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
1383: $userinput.=
1384: $cipher->decrypt(
1385: pack("H16",substr($encinput,$encidx,16))
1386: );
1387: }
1388: $userinput=substr($userinput,0,$cmdlength);
1389: $wasenc=1;
1390: }
1391: }
1392:
1393: # ------------------------------------------------------------- Normal commands
1394: # ------------------------------------------------------------------------ ping
1395: if ($userinput =~ /^ping/) { # client only
1396: if(isClient) {
1397: print $client "$currenthostid\n";
1398: } else {
1399: Reply($client, "refused\n", $userinput);
1400: }
1401: # ------------------------------------------------------------------------ pong
1402: }elsif ($userinput =~ /^pong/) { # client only
1403: if(isClient) {
1404: my $reply=&reply("ping",$clientname);
1405: print $client "$currenthostid:$reply\n";
1406: } else {
1407: Reply($client, "refused\n", $userinput);
1408: }
1409: # ------------------------------------------------------------------------ ekey
1410: } elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs
1411: my $buildkey=time.$$.int(rand 100000);
1412: $buildkey=~tr/1-6/A-F/;
1413: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
1414: my $key=$currenthostid.$clientname;
1415: $key=~tr/a-z/A-Z/;
1416: $key=~tr/G-P/0-9/;
1417: $key=~tr/Q-Z/0-9/;
1418: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
1419: $key=substr($key,0,32);
1420: my $cipherkey=pack("H32",$key);
1421: $cipher=new IDEA $cipherkey;
1422: print $client "$buildkey\n";
1423: # ------------------------------------------------------------------------ load
1424: } elsif ($userinput =~ /^load/) { # client only
1425: if (isClient) {
1426: my $loadavg;
1427: {
1428: my $loadfile=IO::File->new('/proc/loadavg');
1429: $loadavg=<$loadfile>;
1430: }
1431: $loadavg =~ s/\s.*//g;
1432: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1433: print $client "$loadpercent\n";
1434: } else {
1435: Reply($client, "refused\n", $userinput);
1436:
1437: }
1438: # -------------------------------------------------------------------- userload
1439: } elsif ($userinput =~ /^userload/) { # client only
1440: if(isClient) {
1441: my $userloadpercent=&userload();
1442: print $client "$userloadpercent\n";
1443: } else {
1444: Reply($client, "refused\n", $userinput);
1445:
1446: }
1447: #
1448: # Transactions requiring encryption:
1449: #
1450: # ----------------------------------------------------------------- currentauth
1451: } elsif ($userinput =~ /^currentauth/) {
1452: if (($wasenc==1) && isClient) { # Encoded & client only.
1453: my ($cmd,$udom,$uname)=split(/:/,$userinput);
1454: my $result = GetAuthType($udom, $uname);
1455: if($result eq "nouser") {
1456: print $client "unknown_user\n";
1457: }
1458: else {
1459: print $client "$result\n"
1460: }
1461: } else {
1462: Reply($client, "refused\n", $userinput);
1463:
1464: }
1465: #--------------------------------------------------------------------- pushfile
1466: } elsif($userinput =~ /^pushfile/) { # encoded & manager.
1467: if(($wasenc == 1) && isManager) {
1468: my $cert = GetCertificate($userinput);
1469: if(ValidManager($cert)) {
1470: my $reply = PushFile($userinput);
1471: print $client "$reply\n";
1472: } else {
1473: print $client "refused\n";
1474: }
1475: } else {
1476: Reply($client, "refused\n", $userinput);
1477:
1478: }
1479: #--------------------------------------------------------------------- reinit
1480: } elsif($userinput =~ /^reinit/) { # Encoded and manager
1481: if (($wasenc == 1) && isManager) {
1482: my $cert = GetCertificate($userinput);
1483: if(ValidManager($cert)) {
1484: chomp($userinput);
1485: my $reply = ReinitProcess($userinput);
1486: print $client "$reply\n";
1487: } else {
1488: print $client "refused\n";
1489: }
1490: } else {
1491: Reply($client, "refused\n", $userinput);
1492: }
1493: #------------------------------------------------------------------------- edit
1494: } elsif ($userinput =~ /^edit/) { # encoded and manager:
1495: if(($wasenc ==1) && (isManager)) {
1496: my $cert = GetCertificate($userinput);
1497: if(ValidManager($cert)) {
1498: my($command, $filetype, $script) = split(/:/, $userinput);
1499: if (($filetype eq "hosts") || ($filetype eq "domain")) {
1500: if($script ne "") {
1501: Reply($client, EditFile($userinput));
1502: } else {
1503: Reply($client,"refused\n",$userinput);
1504: }
1505: } else {
1506: Reply($client,"refused\n",$userinput);
1507: }
1508: } else {
1509: Reply($client,"refused\n",$userinput);
1510: }
1511: } else {
1512: Reply($client,"refused\n",$userinput);
1513: }
1514: # ------------------------------------------------------------------------ auth
1515: } elsif ($userinput =~ /^auth/) { # Encoded and client only.
1516: if (($wasenc==1) && isClient) {
1517: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
1518: chomp($upass);
1519: $upass=unescape($upass);
1520: my $proname=propath($udom,$uname);
1521: my $passfilename="$proname/passwd";
1522: if (-e $passfilename) {
1523: my $pf = IO::File->new($passfilename);
1524: my $realpasswd=<$pf>;
1525: chomp($realpasswd);
1526: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1527: my $pwdcorrect=0;
1528: if ($howpwd eq 'internal') {
1529: &Debug("Internal auth");
1530: $pwdcorrect=
1531: (crypt($upass,$contentpwd) eq $contentpwd);
1532: } elsif ($howpwd eq 'unix') {
1533: &Debug("Unix auth");
1534: if((getpwnam($uname))[1] eq "") { #no such user!
1535: $pwdcorrect = 0;
1536: } else {
1537: $contentpwd=(getpwnam($uname))[1];
1538: my $pwauth_path="/usr/local/sbin/pwauth";
1539: unless ($contentpwd eq 'x') {
1540: $pwdcorrect=
1541: (crypt($upass,$contentpwd) eq
1542: $contentpwd);
1543: }
1544:
1545: elsif (-e $pwauth_path) {
1546: open PWAUTH, "|$pwauth_path" or
1547: die "Cannot invoke authentication";
1548: print PWAUTH "$uname\n$upass\n";
1549: close PWAUTH;
1550: $pwdcorrect=!$?;
1551: }
1552: }
1553: } elsif ($howpwd eq 'krb4') {
1554: my $null=pack("C",0);
1555: unless ($upass=~/$null/) {
1556: my $krb4_error = &Authen::Krb4::get_pw_in_tkt
1557: ($uname,"",$contentpwd,'krbtgt',
1558: $contentpwd,1,$upass);
1559: if (!$krb4_error) {
1560: $pwdcorrect = 1;
1561: } else {
1562: $pwdcorrect=0;
1563: # log error if it is not a bad password
1564: if ($krb4_error != 62) {
1565: &logthis('krb4:'.$uname.','.$contentpwd.','.
1566: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
1567: }
1568: }
1569: }
1570: } elsif ($howpwd eq 'krb5') {
1571: my $null=pack("C",0);
1572: unless ($upass=~/$null/) {
1573: my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
1574: my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
1575: my $krbserver=&Authen::Krb5::parse_name($krbservice);
1576: my $credentials=&Authen::Krb5::cc_default();
1577: $credentials->initialize($krbclient);
1578: my $krbreturn =
1579: &Authen::Krb5::get_in_tkt_with_password(
1580: $krbclient,$krbserver,$upass,$credentials);
1581: # unless ($krbreturn) {
1582: # &logthis("Krb5 Error: ".
1583: # &Authen::Krb5::error());
1584: # }
1585: $pwdcorrect = ($krbreturn == 1);
1586: } else { $pwdcorrect=0; }
1587: } elsif ($howpwd eq 'localauth') {
1588: $pwdcorrect=&localauth::localauth($uname,$upass,
1589: $contentpwd);
1590: }
1591: if ($pwdcorrect) {
1592: print $client "authorized\n";
1593: } else {
1594: print $client "non_authorized\n";
1595: }
1596: } else {
1597: print $client "unknown_user\n";
1598: }
1599: } else {
1600: Reply($client, "refused\n", $userinput);
1601:
1602: }
1603: # ---------------------------------------------------------------------- passwd
1604: } elsif ($userinput =~ /^passwd/) { # encoded and client
1605: if (($wasenc==1) && isClient) {
1606: my
1607: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
1608: chomp($npass);
1609: $upass=&unescape($upass);
1610: $npass=&unescape($npass);
1611: &Debug("Trying to change password for $uname");
1612: my $proname=propath($udom,$uname);
1613: my $passfilename="$proname/passwd";
1614: if (-e $passfilename) {
1615: my $realpasswd;
1616: { my $pf = IO::File->new($passfilename);
1617: $realpasswd=<$pf>; }
1618: chomp($realpasswd);
1619: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1620: if ($howpwd eq 'internal') {
1621: &Debug("internal auth");
1622: if (crypt($upass,$contentpwd) eq $contentpwd) {
1623: my $salt=time;
1624: $salt=substr($salt,6,2);
1625: my $ncpass=crypt($npass,$salt);
1626: {
1627: my $pf;
1628: if ($pf = IO::File->new(">$passfilename")) {
1629: print $pf "internal:$ncpass\n";
1630: &logthis("Result of password change for $uname: pwchange_success");
1631: print $client "ok\n";
1632: } else {
1633: &logthis("Unable to open $uname passwd to change password");
1634: print $client "non_authorized\n";
1635: }
1636: }
1637:
1638: } else {
1639: print $client "non_authorized\n";
1640: }
1641: } elsif ($howpwd eq 'unix') {
1642: # Unix means we have to access /etc/password
1643: # one way or another.
1644: # First: Make sure the current password is
1645: # correct
1646: &Debug("auth is unix");
1647: $contentpwd=(getpwnam($uname))[1];
1648: my $pwdcorrect = "0";
1649: my $pwauth_path="/usr/local/sbin/pwauth";
1650: unless ($contentpwd eq 'x') {
1651: $pwdcorrect=
1652: (crypt($upass,$contentpwd) eq $contentpwd);
1653: } elsif (-e $pwauth_path) {
1654: open PWAUTH, "|$pwauth_path" or
1655: die "Cannot invoke authentication";
1656: print PWAUTH "$uname\n$upass\n";
1657: close PWAUTH;
1658: &Debug("exited pwauth with $? ($uname,$upass) ");
1659: $pwdcorrect=($? == 0);
1660: }
1661: if ($pwdcorrect) {
1662: my $execdir=$perlvar{'lonDaemons'};
1663: &Debug("Opening lcpasswd pipeline");
1664: my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
1665: print $pf "$uname\n$npass\n$npass\n";
1666: close $pf;
1667: my $err = $?;
1668: my $result = ($err>0 ? 'pwchange_failure'
1669: : 'ok');
1670: &logthis("Result of password change for $uname: ".
1671: &lcpasswdstrerror($?));
1672: print $client "$result\n";
1673: } else {
1674: print $client "non_authorized\n";
1675: }
1676: } else {
1677: print $client "auth_mode_error\n";
1678: }
1679: } else {
1680: print $client "unknown_user\n";
1681: }
1682: } else {
1683: Reply($client, "refused\n", $userinput);
1684:
1685: }
1686: # -------------------------------------------------------------------- makeuser
1687: } elsif ($userinput =~ /^makeuser/) { # encoded and client.
1688: &Debug("Make user received");
1689: my $oldumask=umask(0077);
1690: if (($wasenc==1) && isClient) {
1691: my
1692: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
1693: &Debug("cmd =".$cmd." $udom =".$udom.
1694: " uname=".$uname);
1695: chomp($npass);
1696: $npass=&unescape($npass);
1697: my $proname=propath($udom,$uname);
1698: my $passfilename="$proname/passwd";
1699: &Debug("Password file created will be:".
1700: $passfilename);
1701: if (-e $passfilename) {
1702: print $client "already_exists\n";
1703: } elsif ($udom ne $currentdomainid) {
1704: print $client "not_right_domain\n";
1705: } else {
1706: my @fpparts=split(/\//,$proname);
1707: my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
1708: my $fperror='';
1709: for (my $i=3;$i<=$#fpparts;$i++) {
1710: $fpnow.='/'.$fpparts[$i];
1711: unless (-e $fpnow) {
1712: unless (mkdir($fpnow,0777)) {
1713: $fperror="error: ".($!+0)
1714: ." mkdir failed while attempting "
1715: ."makeuser";
1716: }
1717: }
1718: }
1719: unless ($fperror) {
1720: my $result=&make_passwd_file($uname, $umode,$npass,
1721: $passfilename);
1722: print $client $result;
1723: } else {
1724: print $client "$fperror\n";
1725: }
1726: }
1727: } else {
1728: Reply($client, "refused\n", $userinput);
1729:
1730: }
1731: umask($oldumask);
1732: # -------------------------------------------------------------- changeuserauth
1733: } elsif ($userinput =~ /^changeuserauth/) { # encoded & client
1734: &Debug("Changing authorization");
1735: if (($wasenc==1) && isClient) {
1736: my
1737: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
1738: chomp($npass);
1739: &Debug("cmd = ".$cmd." domain= ".$udom.
1740: "uname =".$uname." umode= ".$umode);
1741: $npass=&unescape($npass);
1742: my $proname=&propath($udom,$uname);
1743: my $passfilename="$proname/passwd";
1744: if ($udom ne $currentdomainid) {
1745: print $client "not_right_domain\n";
1746: } else {
1747: my $result=&make_passwd_file($uname, $umode,$npass,
1748: $passfilename);
1749: print $client $result;
1750: }
1751: } else {
1752: Reply($client, "refused\n", $userinput);
1753:
1754: }
1755: # ------------------------------------------------------------------------ home
1756: } elsif ($userinput =~ /^home/) { # client clear or encoded
1757: if(isClient) {
1758: my ($cmd,$udom,$uname)=split(/:/,$userinput);
1759: chomp($uname);
1760: my $proname=propath($udom,$uname);
1761: if (-e $proname) {
1762: print $client "found\n";
1763: } else {
1764: print $client "not_found\n";
1765: }
1766: } else {
1767: Reply($client, "refused\n", $userinput);
1768:
1769: }
1770: # ---------------------------------------------------------------------- update
1771: } elsif ($userinput =~ /^update/) { # client clear or encoded.
1772: if(isClient) {
1773: my ($cmd,$fname)=split(/:/,$userinput);
1774: my $ownership=ishome($fname);
1775: if ($ownership eq 'not_owner') {
1776: if (-e $fname) {
1777: my ($dev,$ino,$mode,$nlink,
1778: $uid,$gid,$rdev,$size,
1779: $atime,$mtime,$ctime,
1780: $blksize,$blocks)=stat($fname);
1781: my $now=time;
1782: my $since=$now-$atime;
1783: if ($since>$perlvar{'lonExpire'}) {
1784: my $reply=
1785: &reply("unsub:$fname","$clientname");
1786: unlink("$fname");
1787: } else {
1788: my $transname="$fname.in.transfer";
1789: my $remoteurl=
1790: &reply("sub:$fname","$clientname");
1791: my $response;
1792: {
1793: my $ua=new LWP::UserAgent;
1794: my $request=new HTTP::Request('GET',"$remoteurl");
1795: $response=$ua->request($request,$transname);
1796: }
1797: if ($response->is_error()) {
1798: unlink($transname);
1799: my $message=$response->status_line;
1800: &logthis(
1801: "LWP GET: $message for $fname ($remoteurl)");
1802: } else {
1803: if ($remoteurl!~/\.meta$/) {
1804: my $ua=new LWP::UserAgent;
1805: my $mrequest=
1806: new HTTP::Request('GET',$remoteurl.'.meta');
1807: my $mresponse=
1808: $ua->request($mrequest,$fname.'.meta');
1809: if ($mresponse->is_error()) {
1810: unlink($fname.'.meta');
1811: }
1812: }
1813: rename($transname,$fname);
1814: }
1815: }
1816: print $client "ok\n";
1817: } else {
1818: print $client "not_found\n";
1819: }
1820: } else {
1821: print $client "rejected\n";
1822: }
1823: } else {
1824: Reply($client, "refused\n", $userinput);
1825:
1826: }
1827: # -------------------------------------- fetch a user file from a remote server
1828: } elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
1829: if(isClient) {
1830: my ($cmd,$fname)=split(/:/,$userinput);
1831: my ($udom,$uname,$ufile)=split(/\//,$fname);
1832: my $udir=propath($udom,$uname).'/userfiles';
1833: unless (-e $udir) { mkdir($udir,0770); }
1834: if (-e $udir) {
1835: $ufile=~s/^[\.\~]+//;
1836: $ufile=~s/\///g;
1837: my $destname=$udir.'/'.$ufile;
1838: my $transname=$udir.'/'.$ufile.'.in.transit';
1839: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
1840: my $response;
1841: {
1842: my $ua=new LWP::UserAgent;
1843: my $request=new HTTP::Request('GET',"$remoteurl");
1844: $response=$ua->request($request,$transname);
1845: }
1846: if ($response->is_error()) {
1847: unlink($transname);
1848: my $message=$response->status_line;
1849: &logthis("LWP GET: $message for $fname ($remoteurl)");
1850: print $client "failed\n";
1851: } else {
1852: if (!rename($transname,$destname)) {
1853: &logthis("Unable to move $transname to $destname");
1854: unlink($transname);
1855: print $client "failed\n";
1856: } else {
1857: print $client "ok\n";
1858: }
1859: }
1860: } else {
1861: print $client "not_home\n";
1862: }
1863: } else {
1864: Reply($client, "refused\n", $userinput);
1865:
1866: }
1867: # ------------------------------------------ authenticate access to a user file
1868: } elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
1869: if(isClient) {
1870: my ($cmd,$fname,$session)=split(/:/,$userinput);
1871: chomp($session);
1872: my $reply='non_auth';
1873: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
1874: $session.'.id')) {
1875: while (my $line=<ENVIN>) {
1876: if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
1877: }
1878: close(ENVIN);
1879: print $client $reply."\n";
1880: } else {
1881: print $client "invalid_token\n";
1882: }
1883: } else {
1884: Reply($client, "refused\n", $userinput);
1885:
1886: }
1887: # ----------------------------------------------------------------- unsubscribe
1888: } elsif ($userinput =~ /^unsub/) {
1889: if(isClient) {
1890: my ($cmd,$fname)=split(/:/,$userinput);
1891: if (-e $fname) {
1892: print $client &unsub($client,$fname,$clientip);
1893: } else {
1894: print $client "not_found\n";
1895: }
1896: } else {
1897: Reply($client, "refused\n", $userinput);
1898:
1899: }
1900: # ------------------------------------------------------------------- subscribe
1901: } elsif ($userinput =~ /^sub/) {
1902: if(isClient) {
1903: print $client &subscribe($userinput,$clientip);
1904: } else {
1905: Reply($client, "refused\n", $userinput);
1906:
1907: }
1908: # ------------------------------------------------------------- current version
1909: } elsif ($userinput =~ /^currentversion/) {
1910: if(isClient) {
1911: my ($cmd,$fname)=split(/:/,$userinput);
1912: print $client ¤tversion($fname)."\n";
1913: } else {
1914: Reply($client, "refused\n", $userinput);
1915:
1916: }
1917: # ------------------------------------------------------------------------- log
1918: } elsif ($userinput =~ /^log/) {
1919: if(isClient) {
1920: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
1921: chomp($what);
1922: my $proname=propath($udom,$uname);
1923: my $now=time;
1924: {
1925: my $hfh;
1926: if ($hfh=IO::File->new(">>$proname/activity.log")) {
1927: print $hfh "$now:$clientname:$what\n";
1928: print $client "ok\n";
1929: } else {
1930: print $client "error: ".($!+0)
1931: ." IO::File->new Failed "
1932: ."while attempting log\n";
1933: }
1934: }
1935: } else {
1936: Reply($client, "refused\n", $userinput);
1937:
1938: }
1939: # ------------------------------------------------------------------------- put
1940: } elsif ($userinput =~ /^put/) {
1941: if(isClient) {
1942: my ($cmd,$udom,$uname,$namespace,$what)
1943: =split(/:/,$userinput);
1944: $namespace=~s/\//\_/g;
1945: $namespace=~s/\W//g;
1946: if ($namespace ne 'roles') {
1947: chomp($what);
1948: my $proname=propath($udom,$uname);
1949: my $now=time;
1950: unless ($namespace=~/^nohist\_/) {
1951: my $hfh;
1952: if (
1953: $hfh=IO::File->new(">>$proname/$namespace.hist")
1954: ) { print $hfh "P:$now:$what\n"; }
1955: }
1956: my @pairs=split(/\&/,$what);
1957: my %hash;
1958: if (tie(%hash,'GDBM_File',
1959: "$proname/$namespace.db",
1960: &GDBM_WRCREAT(),0640)) {
1961: foreach my $pair (@pairs) {
1962: my ($key,$value)=split(/=/,$pair);
1963: $hash{$key}=$value;
1964: }
1965: if (untie(%hash)) {
1966: print $client "ok\n";
1967: } else {
1968: print $client "error: ".($!+0)
1969: ." untie(GDBM) failed ".
1970: "while attempting put\n";
1971: }
1972: } else {
1973: print $client "error: ".($!)
1974: ." tie(GDBM) Failed ".
1975: "while attempting put\n";
1976: }
1977: } else {
1978: print $client "refused\n";
1979: }
1980: } else {
1981: Reply($client, "refused\n", $userinput);
1982:
1983: }
1984: # ------------------------------------------------------------------- inc
1985: } elsif ($userinput =~ /^inc:/) {
1986: if(isClient) {
1987: my ($cmd,$udom,$uname,$namespace,$what)
1988: =split(/:/,$userinput);
1989: $namespace=~s/\//\_/g;
1990: $namespace=~s/\W//g;
1991: if ($namespace ne 'roles') {
1992: chomp($what);
1993: my $proname=propath($udom,$uname);
1994: my $now=time;
1995: unless ($namespace=~/^nohist\_/) {
1996: my $hfh;
1997: if (
1998: $hfh=IO::File->new(">>$proname/$namespace.hist")
1999: ) { print $hfh "P:$now:$what\n"; }
2000: }
2001: my @pairs=split(/\&/,$what);
2002: my %hash;
2003: if (tie(%hash,'GDBM_File',
2004: "$proname/$namespace.db",
2005: &GDBM_WRCREAT(),0640)) {
2006: foreach my $pair (@pairs) {
2007: my ($key,$value)=split(/=/,$pair);
2008: # We could check that we have a number...
2009: if (! defined($value) || $value eq '') {
2010: $value = 1;
2011: }
2012: $hash{$key}+=$value;
2013: }
2014: if (untie(%hash)) {
2015: print $client "ok\n";
2016: } else {
2017: print $client "error: ".($!+0)
2018: ." untie(GDBM) failed ".
2019: "while attempting put\n";
2020: }
2021: } else {
2022: print $client "error: ".($!)
2023: ." tie(GDBM) Failed ".
2024: "while attempting put\n";
2025: }
2026: } else {
2027: print $client "refused\n";
2028: }
2029: } else {
2030: Reply($client, "refused\n", $userinput);
2031:
2032: }
2033: # -------------------------------------------------------------------- rolesput
2034: } elsif ($userinput =~ /^rolesput/) {
2035: if(isClient) {
2036: &Debug("rolesput");
2037: if ($wasenc==1) {
2038: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
2039: =split(/:/,$userinput);
2040: &Debug("cmd = ".$cmd." exedom= ".$exedom.
2041: "user = ".$exeuser." udom=".$udom.
2042: "what = ".$what);
2043: my $namespace='roles';
2044: chomp($what);
2045: my $proname=propath($udom,$uname);
2046: my $now=time;
2047: {
2048: my $hfh;
2049: if (
2050: $hfh=IO::File->new(">>$proname/$namespace.hist")
2051: ) {
2052: print $hfh "P:$now:$exedom:$exeuser:$what\n";
2053: }
2054: }
2055: my @pairs=split(/\&/,$what);
2056: my %hash;
2057: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2058: foreach my $pair (@pairs) {
2059: my ($key,$value)=split(/=/,$pair);
2060: &ManagePermissions($key, $udom, $uname,
2061: &GetAuthType( $udom,
2062: $uname));
2063: $hash{$key}=$value;
2064: }
2065: if (untie(%hash)) {
2066: print $client "ok\n";
2067: } else {
2068: print $client "error: ".($!+0)
2069: ." untie(GDBM) Failed ".
2070: "while attempting rolesput\n";
2071: }
2072: } else {
2073: print $client "error: ".($!+0)
2074: ." tie(GDBM) Failed ".
2075: "while attempting rolesput\n";
2076: }
2077: } else {
2078: print $client "refused\n";
2079: }
2080: } else {
2081: Reply($client, "refused\n", $userinput);
2082:
2083: }
2084: # -------------------------------------------------------------------- rolesdel
2085: } elsif ($userinput =~ /^rolesdel/) {
2086: if(isClient) {
2087: &Debug("rolesdel");
2088: if ($wasenc==1) {
2089: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
2090: =split(/:/,$userinput);
2091: &Debug("cmd = ".$cmd." exedom= ".$exedom.
2092: "user = ".$exeuser." udom=".$udom.
2093: "what = ".$what);
2094: my $namespace='roles';
2095: chomp($what);
2096: my $proname=propath($udom,$uname);
2097: my $now=time;
2098: {
2099: my $hfh;
2100: if (
2101: $hfh=IO::File->new(">>$proname/$namespace.hist")
2102: ) {
2103: print $hfh "D:$now:$exedom:$exeuser:$what\n";
2104: }
2105: }
2106: my @rolekeys=split(/\&/,$what);
2107: my %hash;
2108: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2109: foreach my $key (@rolekeys) {
2110: delete $hash{$key};
2111: }
2112: if (untie(%hash)) {
2113: print $client "ok\n";
2114: } else {
2115: print $client "error: ".($!+0)
2116: ." untie(GDBM) Failed ".
2117: "while attempting rolesdel\n";
2118: }
2119: } else {
2120: print $client "error: ".($!+0)
2121: ." tie(GDBM) Failed ".
2122: "while attempting rolesdel\n";
2123: }
2124: } else {
2125: print $client "refused\n";
2126: }
2127: } else {
2128: Reply($client, "refused\n", $userinput);
2129:
2130: }
2131: # ------------------------------------------------------------------------- get
2132: } elsif ($userinput =~ /^get/) {
2133: if(isClient) {
2134: my ($cmd,$udom,$uname,$namespace,$what)
2135: =split(/:/,$userinput);
2136: $namespace=~s/\//\_/g;
2137: $namespace=~s/\W//g;
2138: chomp($what);
2139: my @queries=split(/\&/,$what);
2140: my $proname=propath($udom,$uname);
2141: my $qresult='';
2142: my %hash;
2143: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2144: for (my $i=0;$i<=$#queries;$i++) {
2145: $qresult.="$hash{$queries[$i]}&";
2146: }
2147: if (untie(%hash)) {
2148: $qresult=~s/\&$//;
2149: print $client "$qresult\n";
2150: } else {
2151: print $client "error: ".($!+0)
2152: ." untie(GDBM) Failed ".
2153: "while attempting get\n";
2154: }
2155: } else {
2156: if ($!+0 == 2) {
2157: print $client "error:No such file or ".
2158: "GDBM reported bad block error\n";
2159: } else {
2160: print $client "error: ".($!+0)
2161: ." tie(GDBM) Failed ".
2162: "while attempting get\n";
2163: }
2164: }
2165: } else {
2166: Reply($client, "refused\n", $userinput);
2167:
2168: }
2169: # ------------------------------------------------------------------------ eget
2170: } elsif ($userinput =~ /^eget/) {
2171: if (isClient) {
2172: my ($cmd,$udom,$uname,$namespace,$what)
2173: =split(/:/,$userinput);
2174: $namespace=~s/\//\_/g;
2175: $namespace=~s/\W//g;
2176: chomp($what);
2177: my @queries=split(/\&/,$what);
2178: my $proname=propath($udom,$uname);
2179: my $qresult='';
2180: my %hash;
2181: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2182: for (my $i=0;$i<=$#queries;$i++) {
2183: $qresult.="$hash{$queries[$i]}&";
2184: }
2185: if (untie(%hash)) {
2186: $qresult=~s/\&$//;
2187: if ($cipher) {
2188: my $cmdlength=length($qresult);
2189: $qresult.=" ";
2190: my $encqresult='';
2191: for
2192: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2193: $encqresult.=
2194: unpack("H16",
2195: $cipher->encrypt(substr($qresult,$encidx,8)));
2196: }
2197: print $client "enc:$cmdlength:$encqresult\n";
2198: } else {
2199: print $client "error:no_key\n";
2200: }
2201: } else {
2202: print $client "error: ".($!+0)
2203: ." untie(GDBM) Failed ".
2204: "while attempting eget\n";
2205: }
2206: } else {
2207: print $client "error: ".($!+0)
2208: ." tie(GDBM) Failed ".
2209: "while attempting eget\n";
2210: }
2211: } else {
2212: Reply($client, "refused\n", $userinput);
2213:
2214: }
2215: # ------------------------------------------------------------------------- del
2216: } elsif ($userinput =~ /^del/) {
2217: if(isClient) {
2218: my ($cmd,$udom,$uname,$namespace,$what)
2219: =split(/:/,$userinput);
2220: $namespace=~s/\//\_/g;
2221: $namespace=~s/\W//g;
2222: chomp($what);
2223: my $proname=propath($udom,$uname);
2224: my $now=time;
2225: unless ($namespace=~/^nohist\_/) {
2226: my $hfh;
2227: if (
2228: $hfh=IO::File->new(">>$proname/$namespace.hist")
2229: ) { print $hfh "D:$now:$what\n"; }
2230: }
2231: my @keys=split(/\&/,$what);
2232: my %hash;
2233: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2234: foreach my $key (@keys) {
2235: delete($hash{$key});
2236: }
2237: if (untie(%hash)) {
2238: print $client "ok\n";
2239: } else {
2240: print $client "error: ".($!+0)
2241: ." untie(GDBM) Failed ".
2242: "while attempting del\n";
2243: }
2244: } else {
2245: print $client "error: ".($!+0)
2246: ." tie(GDBM) Failed ".
2247: "while attempting del\n";
2248: }
2249: } else {
2250: Reply($client, "refused\n", $userinput);
2251:
2252: }
2253: # ------------------------------------------------------------------------ keys
2254: } elsif ($userinput =~ /^keys/) {
2255: if(isClient) {
2256: my ($cmd,$udom,$uname,$namespace)
2257: =split(/:/,$userinput);
2258: $namespace=~s/\//\_/g;
2259: $namespace=~s/\W//g;
2260: my $proname=propath($udom,$uname);
2261: my $qresult='';
2262: my %hash;
2263: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2264: foreach my $key (keys %hash) {
2265: $qresult.="$key&";
2266: }
2267: if (untie(%hash)) {
2268: $qresult=~s/\&$//;
2269: print $client "$qresult\n";
2270: } else {
2271: print $client "error: ".($!+0)
2272: ." untie(GDBM) Failed ".
2273: "while attempting keys\n";
2274: }
2275: } else {
2276: print $client "error: ".($!+0)
2277: ." tie(GDBM) Failed ".
2278: "while attempting keys\n";
2279: }
2280: } else {
2281: Reply($client, "refused\n", $userinput);
2282:
2283: }
2284: # ----------------------------------------------------------------- dumpcurrent
2285: } elsif ($userinput =~ /^currentdump/) {
2286: if (isClient) {
2287: my ($cmd,$udom,$uname,$namespace)
2288: =split(/:/,$userinput);
2289: $namespace=~s/\//\_/g;
2290: $namespace=~s/\W//g;
2291: my $qresult='';
2292: my $proname=propath($udom,$uname);
2293: my %hash;
2294: if (tie(%hash,'GDBM_File',
2295: "$proname/$namespace.db",
2296: &GDBM_READER(),0640)) {
2297: # Structure of %data:
2298: # $data{$symb}->{$parameter}=$value;
2299: # $data{$symb}->{'v.'.$parameter}=$version;
2300: # since $parameter will be unescaped, we do not
2301: # have to worry about silly parameter names...
2302: my %data = ();
2303: while (my ($key,$value) = each(%hash)) {
2304: my ($v,$symb,$param) = split(/:/,$key);
2305: next if ($v eq 'version' || $symb eq 'keys');
2306: next if (exists($data{$symb}) &&
2307: exists($data{$symb}->{$param}) &&
2308: $data{$symb}->{'v.'.$param} > $v);
2309: $data{$symb}->{$param}=$value;
2310: $data{$symb}->{'v.'.$param}=$v;
2311: }
2312: if (untie(%hash)) {
2313: while (my ($symb,$param_hash) = each(%data)) {
2314: while(my ($param,$value) = each (%$param_hash)){
2315: next if ($param =~ /^v\./);
2316: $qresult.=$symb.':'.$param.'='.$value.'&';
2317: }
2318: }
2319: chop($qresult);
2320: print $client "$qresult\n";
2321: } else {
2322: print $client "error: ".($!+0)
2323: ." untie(GDBM) Failed ".
2324: "while attempting currentdump\n";
2325: }
2326: } else {
2327: print $client "error: ".($!+0)
2328: ." tie(GDBM) Failed ".
2329: "while attempting currentdump\n";
2330: }
2331: } else {
2332: Reply($client, "refused\n", $userinput);
2333: }
2334: # ------------------------------------------------------------------------ dump
2335: } elsif ($userinput =~ /^dump/) {
2336: if(isClient) {
2337: my ($cmd,$udom,$uname,$namespace,$regexp)
2338: =split(/:/,$userinput);
2339: $namespace=~s/\//\_/g;
2340: $namespace=~s/\W//g;
2341: if (defined($regexp)) {
2342: $regexp=&unescape($regexp);
2343: } else {
2344: $regexp='.';
2345: }
2346: my $qresult='';
2347: my $proname=propath($udom,$uname);
2348: my %hash;
2349: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2350: while (my ($key,$value) = each(%hash)) {
2351: if ($regexp eq '.') {
2352: $qresult.=$key.'='.$value.'&';
2353: } else {
2354: my $unescapeKey = &unescape($key);
2355: if (eval('$unescapeKey=~/$regexp/')) {
2356: $qresult.="$key=$value&";
2357: }
2358: }
2359: }
2360: if (untie(%hash)) {
2361: chop($qresult);
2362: print $client "$qresult\n";
2363: } else {
2364: print $client "error: ".($!+0)
2365: ." untie(GDBM) Failed ".
2366: "while attempting dump\n";
2367: }
2368: } else {
2369: print $client "error: ".($!+0)
2370: ." tie(GDBM) Failed ".
2371: "while attempting dump\n";
2372: }
2373: } else {
2374: Reply($client, "refused\n", $userinput);
2375:
2376: }
2377: # ----------------------------------------------------------------------- store
2378: } elsif ($userinput =~ /^store/) {
2379: if(isClient) {
2380: my ($cmd,$udom,$uname,$namespace,$rid,$what)
2381: =split(/:/,$userinput);
2382: $namespace=~s/\//\_/g;
2383: $namespace=~s/\W//g;
2384: if ($namespace ne 'roles') {
2385: chomp($what);
2386: my $proname=propath($udom,$uname);
2387: my $now=time;
2388: unless ($namespace=~/^nohist\_/) {
2389: my $hfh;
2390: if (
2391: $hfh=IO::File->new(">>$proname/$namespace.hist")
2392: ) { print $hfh "P:$now:$rid:$what\n"; }
2393: }
2394: my @pairs=split(/\&/,$what);
2395: my %hash;
2396: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2397: my @previouskeys=split(/&/,$hash{"keys:$rid"});
2398: my $key;
2399: $hash{"version:$rid"}++;
2400: my $version=$hash{"version:$rid"};
2401: my $allkeys='';
2402: foreach my $pair (@pairs) {
2403: my ($key,$value)=split(/=/,$pair);
2404: $allkeys.=$key.':';
2405: $hash{"$version:$rid:$key"}=$value;
2406: }
2407: $hash{"$version:$rid:timestamp"}=$now;
2408: $allkeys.='timestamp';
2409: $hash{"$version:keys:$rid"}=$allkeys;
2410: if (untie(%hash)) {
2411: print $client "ok\n";
2412: } else {
2413: print $client "error: ".($!+0)
2414: ." untie(GDBM) Failed ".
2415: "while attempting store\n";
2416: }
2417: } else {
2418: print $client "error: ".($!+0)
2419: ." tie(GDBM) Failed ".
2420: "while attempting store\n";
2421: }
2422: } else {
2423: print $client "refused\n";
2424: }
2425: } else {
2426: Reply($client, "refused\n", $userinput);
2427:
2428: }
2429: # --------------------------------------------------------------------- restore
2430: } elsif ($userinput =~ /^restore/) {
2431: if(isClient) {
2432: my ($cmd,$udom,$uname,$namespace,$rid)
2433: =split(/:/,$userinput);
2434: $namespace=~s/\//\_/g;
2435: $namespace=~s/\W//g;
2436: chomp($rid);
2437: my $proname=propath($udom,$uname);
2438: my $qresult='';
2439: my %hash;
2440: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2441: my $version=$hash{"version:$rid"};
2442: $qresult.="version=$version&";
2443: my $scope;
2444: for ($scope=1;$scope<=$version;$scope++) {
2445: my $vkeys=$hash{"$scope:keys:$rid"};
2446: my @keys=split(/:/,$vkeys);
2447: my $key;
2448: $qresult.="$scope:keys=$vkeys&";
2449: foreach $key (@keys) {
2450: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
2451: }
2452: }
2453: if (untie(%hash)) {
2454: $qresult=~s/\&$//;
2455: print $client "$qresult\n";
2456: } else {
2457: print $client "error: ".($!+0)
2458: ." untie(GDBM) Failed ".
2459: "while attempting restore\n";
2460: }
2461: } else {
2462: print $client "error: ".($!+0)
2463: ." tie(GDBM) Failed ".
2464: "while attempting restore\n";
2465: }
2466: } else {
2467: Reply($client, "refused\n", $userinput);
2468:
2469: }
2470: # -------------------------------------------------------------------- chatsend
2471: } elsif ($userinput =~ /^chatsend/) {
2472: if(isClient) {
2473: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
2474: &chatadd($cdom,$cnum,$newpost);
2475: print $client "ok\n";
2476: } else {
2477: Reply($client, "refused\n", $userinput);
2478:
2479: }
2480: # -------------------------------------------------------------------- chatretr
2481: } elsif ($userinput =~ /^chatretr/) {
2482: if(isClient) {
2483: my
2484: ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
2485: my $reply='';
2486: foreach (&getchat($cdom,$cnum,$udom,$uname)) {
2487: $reply.=&escape($_).':';
2488: }
2489: $reply=~s/\:$//;
2490: print $client $reply."\n";
2491: } else {
2492: Reply($client, "refused\n", $userinput);
2493:
2494: }
2495: # ------------------------------------------------------------------- querysend
2496: } elsif ($userinput =~ /^querysend/) {
2497: if(isClient) {
2498: my ($cmd,$query,
2499: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
2500: $query=~s/\n*$//g;
2501: print $client "".
2502: sqlreply("$clientname\&$query".
2503: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
2504: } else {
2505: Reply($client, "refused\n", $userinput);
2506:
2507: }
2508: # ------------------------------------------------------------------ queryreply
2509: } elsif ($userinput =~ /^queryreply/) {
2510: if(isClient) {
2511: my ($cmd,$id,$reply)=split(/:/,$userinput);
2512: my $store;
2513: my $execdir=$perlvar{'lonDaemons'};
2514: if ($store=IO::File->new(">$execdir/tmp/$id")) {
2515: $reply=~s/\&/\n/g;
2516: print $store $reply;
2517: close $store;
2518: my $store2=IO::File->new(">$execdir/tmp/$id.end");
2519: print $store2 "done\n";
2520: close $store2;
2521: print $client "ok\n";
2522: }
2523: else {
2524: print $client "error: ".($!+0)
2525: ." IO::File->new Failed ".
2526: "while attempting queryreply\n";
2527: }
2528: } else {
2529: Reply($client, "refused\n", $userinput);
2530:
2531: }
2532: # ----------------------------------------------------------------- courseidput
2533: } elsif ($userinput =~ /^courseidput/) {
2534: if(isClient) {
2535: my ($cmd,$udom,$what)=split(/:/,$userinput);
2536: chomp($what);
2537: $udom=~s/\W//g;
2538: my $proname=
2539: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2540: my $now=time;
2541: my @pairs=split(/\&/,$what);
2542: my %hash;
2543: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2544: foreach my $pair (@pairs) {
2545: my ($key,$value)=split(/=/,$pair);
2546: $hash{$key}=$value.':'.$now;
2547: }
2548: if (untie(%hash)) {
2549: print $client "ok\n";
2550: } else {
2551: print $client "error: ".($!+0)
2552: ." untie(GDBM) Failed ".
2553: "while attempting courseidput\n";
2554: }
2555: } else {
2556: print $client "error: ".($!+0)
2557: ." tie(GDBM) Failed ".
2558: "while attempting courseidput\n";
2559: }
2560: } else {
2561: Reply($client, "refused\n", $userinput);
2562:
2563: }
2564: # ---------------------------------------------------------------- courseiddump
2565: } elsif ($userinput =~ /^courseiddump/) {
2566: if(isClient) {
2567: my ($cmd,$udom,$since,$description)
2568: =split(/:/,$userinput);
2569: if (defined($description)) {
2570: $description=&unescape($description);
2571: } else {
2572: $description='.';
2573: }
2574: unless (defined($since)) { $since=0; }
2575: my $qresult='';
2576: my $proname=
2577: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2578: my %hash;
2579: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2580: while (my ($key,$value) = each(%hash)) {
2581: my ($descr,$lasttime)=split(/\:/,$value);
2582: if ($lasttime<$since) { next; }
2583: if ($description eq '.') {
2584: $qresult.=$key.'='.$descr.'&';
2585: } else {
2586: my $unescapeVal = &unescape($descr);
2587: if (eval('$unescapeVal=~/$description/i')) {
2588: $qresult.="$key=$descr&";
2589: }
2590: }
2591: }
2592: if (untie(%hash)) {
2593: chop($qresult);
2594: print $client "$qresult\n";
2595: } else {
2596: print $client "error: ".($!+0)
2597: ." untie(GDBM) Failed ".
2598: "while attempting courseiddump\n";
2599: }
2600: } else {
2601: print $client "error: ".($!+0)
2602: ." tie(GDBM) Failed ".
2603: "while attempting courseiddump\n";
2604: }
2605: } else {
2606: Reply($client, "refused\n", $userinput);
2607:
2608: }
2609: # ----------------------------------------------------------------------- idput
2610: } elsif ($userinput =~ /^idput/) {
2611: if(isClient) {
2612: my ($cmd,$udom,$what)=split(/:/,$userinput);
2613: chomp($what);
2614: $udom=~s/\W//g;
2615: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2616: my $now=time;
2617: {
2618: my $hfh;
2619: if (
2620: $hfh=IO::File->new(">>$proname.hist")
2621: ) { print $hfh "P:$now:$what\n"; }
2622: }
2623: my @pairs=split(/\&/,$what);
2624: my %hash;
2625: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2626: foreach my $pair (@pairs) {
2627: my ($key,$value)=split(/=/,$pair);
2628: $hash{$key}=$value;
2629: }
2630: if (untie(%hash)) {
2631: print $client "ok\n";
2632: } else {
2633: print $client "error: ".($!+0)
2634: ." untie(GDBM) Failed ".
2635: "while attempting idput\n";
2636: }
2637: } else {
2638: print $client "error: ".($!+0)
2639: ." tie(GDBM) Failed ".
2640: "while attempting idput\n";
2641: }
2642: } else {
2643: Reply($client, "refused\n", $userinput);
2644:
2645: }
2646: # ----------------------------------------------------------------------- idget
2647: } elsif ($userinput =~ /^idget/) {
2648: if(isClient) {
2649: my ($cmd,$udom,$what)=split(/:/,$userinput);
2650: chomp($what);
2651: $udom=~s/\W//g;
2652: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2653: my @queries=split(/\&/,$what);
2654: my $qresult='';
2655: my %hash;
2656: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2657: for (my $i=0;$i<=$#queries;$i++) {
2658: $qresult.="$hash{$queries[$i]}&";
2659: }
2660: if (untie(%hash)) {
2661: $qresult=~s/\&$//;
2662: print $client "$qresult\n";
2663: } else {
2664: print $client "error: ".($!+0)
2665: ." untie(GDBM) Failed ".
2666: "while attempting idget\n";
2667: }
2668: } else {
2669: print $client "error: ".($!+0)
2670: ." tie(GDBM) Failed ".
2671: "while attempting idget\n";
2672: }
2673: } else {
2674: Reply($client, "refused\n", $userinput);
2675:
2676: }
2677: # ---------------------------------------------------------------------- tmpput
2678: } elsif ($userinput =~ /^tmpput/) {
2679: if(isClient) {
2680: my ($cmd,$what)=split(/:/,$userinput);
2681: my $store;
2682: $tmpsnum++;
2683: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
2684: $id=~s/\W/\_/g;
2685: $what=~s/\n//g;
2686: my $execdir=$perlvar{'lonDaemons'};
2687: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
2688: print $store $what;
2689: close $store;
2690: print $client "$id\n";
2691: }
2692: else {
2693: print $client "error: ".($!+0)
2694: ."IO::File->new Failed ".
2695: "while attempting tmpput\n";
2696: }
2697: } else {
2698: Reply($client, "refused\n", $userinput);
2699:
2700: }
2701:
2702: # ---------------------------------------------------------------------- tmpget
2703: } elsif ($userinput =~ /^tmpget/) {
2704: if(isClient) {
2705: my ($cmd,$id)=split(/:/,$userinput);
2706: chomp($id);
2707: $id=~s/\W/\_/g;
2708: my $store;
2709: my $execdir=$perlvar{'lonDaemons'};
2710: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
2711: my $reply=<$store>;
2712: print $client "$reply\n";
2713: close $store;
2714: }
2715: else {
2716: print $client "error: ".($!+0)
2717: ."IO::File->new Failed ".
2718: "while attempting tmpget\n";
2719: }
2720: } else {
2721: Reply($client, "refused\n", $userinput);
2722:
2723: }
2724: # ---------------------------------------------------------------------- tmpdel
2725: } elsif ($userinput =~ /^tmpdel/) {
2726: if(isClient) {
2727: my ($cmd,$id)=split(/:/,$userinput);
2728: chomp($id);
2729: $id=~s/\W/\_/g;
2730: my $execdir=$perlvar{'lonDaemons'};
2731: if (unlink("$execdir/tmp/$id.tmp")) {
2732: print $client "ok\n";
2733: } else {
2734: print $client "error: ".($!+0)
2735: ."Unlink tmp Failed ".
2736: "while attempting tmpdel\n";
2737: }
2738: } else {
2739: Reply($client, "refused\n", $userinput);
2740:
2741: }
2742: # -------------------------------------------------------------------------- ls
2743: } elsif ($userinput =~ /^ls/) {
2744: if(isClient) {
2745: my $obs;
2746: my $rights;
2747: my ($cmd,$ulsdir)=split(/:/,$userinput);
2748: my $ulsout='';
2749: my $ulsfn;
2750: if (-e $ulsdir) {
2751: if(-d $ulsdir) {
2752: if (opendir(LSDIR,$ulsdir)) {
2753: while ($ulsfn=readdir(LSDIR)) {
2754: undef $obs, $rights;
2755: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
2756: #We do some obsolete checking here
2757: if(-e $ulsdir.'/'.$ulsfn.".meta") {
2758: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
2759: my @obsolete=<FILE>;
2760: foreach my $obsolete (@obsolete) {
2761: if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
2762: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
2763: }
2764: }
2765: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
2766: if($obs eq '1') { $ulsout.="&1"; }
2767: else { $ulsout.="&0"; }
2768: if($rights eq '1') { $ulsout.="&1:"; }
2769: else { $ulsout.="&0:"; }
2770: }
2771: closedir(LSDIR);
2772: }
2773: } else {
2774: my @ulsstats=stat($ulsdir);
2775: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
2776: }
2777: } else {
2778: $ulsout='no_such_dir';
2779: }
2780: if ($ulsout eq '') { $ulsout='empty'; }
2781: print $client "$ulsout\n";
2782: } else {
2783: Reply($client, "refused\n", $userinput);
2784:
2785: }
2786: # ----------------------------------------------------------------- setannounce
2787: } elsif ($userinput =~ /^setannounce/) {
2788: if (isClient) {
2789: my ($cmd,$announcement)=split(/:/,$userinput);
2790: chomp($announcement);
2791: $announcement=&unescape($announcement);
2792: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
2793: '/announcement.txt')) {
2794: print $store $announcement;
2795: close $store;
2796: print $client "ok\n";
2797: } else {
2798: print $client "error: ".($!+0)."\n";
2799: }
2800: } else {
2801: Reply($client, "refused\n", $userinput);
2802:
2803: }
2804: # ------------------------------------------------------------------ Hanging up
2805: } elsif (($userinput =~ /^exit/) ||
2806: ($userinput =~ /^init/)) { # no restrictions.
2807: &logthis(
2808: "Client $clientip ($clientname) hanging up: $userinput");
2809: print $client "bye\n";
2810: $client->shutdown(2); # shutdown the socket forcibly.
2811: $client->close();
2812: last;
2813:
2814: # ---------------------------------- set current host/domain
2815: } elsif ($userinput =~ /^sethost:/) {
2816: if (isClient) {
2817: print $client &sethost($userinput)."\n";
2818: } else {
2819: print $client "refused\n";
2820: }
2821: #---------------------------------- request file (?) version.
2822: } elsif ($userinput =~/^version:/) {
2823: if (isClient) {
2824: print $client &version($userinput)."\n";
2825: } else {
2826: print $client "refused\n";
2827: }
2828: # ------------------------------------------------------------- unknown command
2829:
2830: } else {
2831: # unknown command
2832: print $client "unknown_cmd\n";
2833: }
2834: # -------------------------------------------------------------------- complete
2835: alarm(0);
2836: &status('Listening to '.$clientname);
2837: }
2838: # --------------------------------------------- client unknown or fishy, refuse
2839: } else {
2840: print $client "refused\n";
2841: $client->close();
2842: &logthis("<font color=blue>WARNING: "
2843: ."Rejected client $clientip, closing connection</font>");
2844: }
2845: }
2846:
2847: # =============================================================================
2848:
2849: &logthis("<font color=red>CRITICAL: "
2850: ."Disconnect from $clientip ($clientname)</font>");
2851:
2852:
2853: # this exit is VERY important, otherwise the child will become
2854: # a producer of more and more children, forking yourself into
2855: # process death.
2856: exit;
2857:
2858: }
2859:
2860:
2861: #
2862: # Checks to see if the input roleput request was to set
2863: # an author role. If so, invokes the lchtmldir script to set
2864: # up a correct public_html
2865: # Parameters:
2866: # request - The request sent to the rolesput subchunk.
2867: # We're looking for /domain/_au
2868: # domain - The domain in which the user is having roles doctored.
2869: # user - Name of the user for which the role is being put.
2870: # authtype - The authentication type associated with the user.
2871: #
2872: sub ManagePermissions
2873: {
2874: my $request = shift;
2875: my $domain = shift;
2876: my $user = shift;
2877: my $authtype= shift;
2878:
2879: # See if the request is of the form /$domain/_au
2880: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
2881: my $execdir = $perlvar{'lonDaemons'};
2882: my $userhome= "/home/$user" ;
2883: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
2884: system("$execdir/lchtmldir $userhome $user $authtype");
2885: }
2886: }
2887: #
2888: # GetAuthType - Determines the authorization type of a user in a domain.
2889:
2890: # Returns the authorization type or nouser if there is no such user.
2891: #
2892: sub GetAuthType
2893: {
2894: my $domain = shift;
2895: my $user = shift;
2896:
2897: Debug("GetAuthType( $domain, $user ) \n");
2898: my $proname = &propath($domain, $user);
2899: my $passwdfile = "$proname/passwd";
2900: if( -e $passwdfile ) {
2901: my $pf = IO::File->new($passwdfile);
2902: my $realpassword = <$pf>;
2903: chomp($realpassword);
2904: Debug("Password info = $realpassword\n");
2905: my ($authtype, $contentpwd) = split(/:/, $realpassword);
2906: Debug("Authtype = $authtype, content = $contentpwd\n");
2907: my $availinfo = '';
2908: if($authtype eq 'krb4' or $authtype eq 'krb5') {
2909: $availinfo = $contentpwd;
2910: }
2911:
2912: return "$authtype:$availinfo";
2913: }
2914: else {
2915: Debug("Returning nouser");
2916: return "nouser";
2917: }
2918: }
2919:
2920: sub addline {
2921: my ($fname,$hostid,$ip,$newline)=@_;
2922: my $contents;
2923: my $found=0;
2924: my $expr='^'.$hostid.':'.$ip.':';
2925: $expr =~ s/\./\\\./g;
2926: my $sh;
2927: if ($sh=IO::File->new("$fname.subscription")) {
2928: while (my $subline=<$sh>) {
2929: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
2930: }
2931: $sh->close();
2932: }
2933: $sh=IO::File->new(">$fname.subscription");
2934: if ($contents) { print $sh $contents; }
2935: if ($newline) { print $sh $newline; }
2936: $sh->close();
2937: return $found;
2938: }
2939:
2940: sub getchat {
2941: my ($cdom,$cname,$udom,$uname)=@_;
2942: my %hash;
2943: my $proname=&propath($cdom,$cname);
2944: my @entries=();
2945: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
2946: &GDBM_READER(),0640)) {
2947: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
2948: untie %hash;
2949: }
2950: my @participants=();
2951: my $cutoff=time-60;
2952: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
2953: &GDBM_WRCREAT(),0640)) {
2954: $hash{$uname.':'.$udom}=time;
2955: foreach (sort keys %hash) {
2956: if ($hash{$_}>$cutoff) {
2957: $participants[$#participants+1]='active_participant:'.$_;
2958: }
2959: }
2960: untie %hash;
2961: }
2962: return (@participants,@entries);
2963: }
2964:
2965: sub chatadd {
2966: my ($cdom,$cname,$newchat)=@_;
2967: my %hash;
2968: my $proname=&propath($cdom,$cname);
2969: my @entries=();
2970: my $time=time;
2971: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
2972: &GDBM_WRCREAT(),0640)) {
2973: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
2974: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
2975: my ($thentime,$idnum)=split(/\_/,$lastid);
2976: my $newid=$time.'_000000';
2977: if ($thentime==$time) {
2978: $idnum=~s/^0+//;
2979: $idnum++;
2980: $idnum=substr('000000'.$idnum,-6,6);
2981: $newid=$time.'_'.$idnum;
2982: }
2983: $hash{$newid}=$newchat;
2984: my $expired=$time-3600;
2985: foreach (keys %hash) {
2986: my ($thistime)=($_=~/(\d+)\_/);
2987: if ($thistime<$expired) {
2988: delete $hash{$_};
2989: }
2990: }
2991: untie %hash;
2992: }
2993: {
2994: my $hfh;
2995: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
2996: print $hfh "$time:".&unescape($newchat)."\n";
2997: }
2998: }
2999: }
3000:
3001: sub unsub {
3002: my ($fname,$clientip)=@_;
3003: my $result;
3004: if (unlink("$fname.$clientname")) {
3005: $result="ok\n";
3006: } else {
3007: $result="not_subscribed\n";
3008: }
3009: if (-e "$fname.subscription") {
3010: my $found=&addline($fname,$clientname,$clientip,'');
3011: if ($found) { $result="ok\n"; }
3012: } else {
3013: if ($result != "ok\n") { $result="not_subscribed\n"; }
3014: }
3015: return $result;
3016: }
3017:
3018: sub currentversion {
3019: my $fname=shift;
3020: my $version=-1;
3021: my $ulsdir='';
3022: if ($fname=~/^(.+)\/[^\/]+$/) {
3023: $ulsdir=$1;
3024: }
3025: my ($fnamere1,$fnamere2);
3026: # remove version if already specified
3027: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
3028: # get the bits that go before and after the version number
3029: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
3030: $fnamere1=$1;
3031: $fnamere2='.'.$2;
3032: }
3033: if (-e $fname) { $version=1; }
3034: if (-e $ulsdir) {
3035: if(-d $ulsdir) {
3036: if (opendir(LSDIR,$ulsdir)) {
3037: my $ulsfn;
3038: while ($ulsfn=readdir(LSDIR)) {
3039: # see if this is a regular file (ignore links produced earlier)
3040: my $thisfile=$ulsdir.'/'.$ulsfn;
3041: unless (-l $thisfile) {
3042: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
3043: if ($1>$version) { $version=$1; }
3044: }
3045: }
3046: }
3047: closedir(LSDIR);
3048: $version++;
3049: }
3050: }
3051: }
3052: return $version;
3053: }
3054:
3055: sub thisversion {
3056: my $fname=shift;
3057: my $version=-1;
3058: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
3059: $version=$1;
3060: }
3061: return $version;
3062: }
3063:
3064: sub subscribe {
3065: my ($userinput,$clientip)=@_;
3066: my $result;
3067: my ($cmd,$fname)=split(/:/,$userinput);
3068: my $ownership=&ishome($fname);
3069: if ($ownership eq 'owner') {
3070: # explitly asking for the current version?
3071: unless (-e $fname) {
3072: my $currentversion=¤tversion($fname);
3073: if (&thisversion($fname)==$currentversion) {
3074: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
3075: my $root=$1;
3076: my $extension=$2;
3077: symlink($root.'.'.$extension,
3078: $root.'.'.$currentversion.'.'.$extension);
3079: unless ($extension=~/\.meta$/) {
3080: symlink($root.'.'.$extension.'.meta',
3081: $root.'.'.$currentversion.'.'.$extension.'.meta');
3082: }
3083: }
3084: }
3085: }
3086: if (-e $fname) {
3087: if (-d $fname) {
3088: $result="directory\n";
3089: } else {
3090: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
3091: my $now=time;
3092: my $found=&addline($fname,$clientname,$clientip,
3093: "$clientname:$clientip:$now\n");
3094: if ($found) { $result="$fname\n"; }
3095: # if they were subscribed to only meta data, delete that
3096: # subscription, when you subscribe to a file you also get
3097: # the metadata
3098: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
3099: $fname=~s/\/home\/httpd\/html\/res/raw/;
3100: $fname="http://$thisserver/".$fname;
3101: $result="$fname\n";
3102: }
3103: } else {
3104: $result="not_found\n";
3105: }
3106: } else {
3107: $result="rejected\n";
3108: }
3109: return $result;
3110: }
3111:
3112: sub make_passwd_file {
3113: my ($uname, $umode,$npass,$passfilename)=@_;
3114: my $result="ok\n";
3115: if ($umode eq 'krb4' or $umode eq 'krb5') {
3116: {
3117: my $pf = IO::File->new(">$passfilename");
3118: print $pf "$umode:$npass\n";
3119: }
3120: } elsif ($umode eq 'internal') {
3121: my $salt=time;
3122: $salt=substr($salt,6,2);
3123: my $ncpass=crypt($npass,$salt);
3124: {
3125: &Debug("Creating internal auth");
3126: my $pf = IO::File->new(">$passfilename");
3127: print $pf "internal:$ncpass\n";
3128: }
3129: } elsif ($umode eq 'localauth') {
3130: {
3131: my $pf = IO::File->new(">$passfilename");
3132: print $pf "localauth:$npass\n";
3133: }
3134: } elsif ($umode eq 'unix') {
3135: {
3136: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
3137: {
3138: &Debug("Executing external: ".$execpath);
3139: &Debug("user = ".$uname.", Password =". $npass);
3140: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
3141: print $se "$uname\n";
3142: print $se "$npass\n";
3143: print $se "$npass\n";
3144: }
3145: my $useraddok = $?;
3146: if($useraddok > 0) {
3147: &logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
3148: }
3149: my $pf = IO::File->new(">$passfilename");
3150: print $pf "unix:\n";
3151: }
3152: } elsif ($umode eq 'none') {
3153: {
3154: my $pf = IO::File->new(">$passfilename");
3155: print $pf "none:\n";
3156: }
3157: } else {
3158: $result="auth_mode_error\n";
3159: }
3160: return $result;
3161: }
3162:
3163: sub sethost {
3164: my ($remotereq) = @_;
3165: my (undef,$hostid)=split(/:/,$remotereq);
3166: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
3167: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
3168: $currenthostid=$hostid;
3169: $currentdomainid=$hostdom{$hostid};
3170: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
3171: } else {
3172: &logthis("Requested host id $hostid not an alias of ".
3173: $perlvar{'lonHostID'}." refusing connection");
3174: return 'unable_to_set';
3175: }
3176: return 'ok';
3177: }
3178:
3179: sub version {
3180: my ($userinput)=@_;
3181: $remoteVERSION=(split(/:/,$userinput))[1];
3182: return "version:$VERSION";
3183: }
3184:
3185: #There is a copy of this in lonnet.pm
3186: sub userload {
3187: my $numusers=0;
3188: {
3189: opendir(LONIDS,$perlvar{'lonIDsDir'});
3190: my $filename;
3191: my $curtime=time;
3192: while ($filename=readdir(LONIDS)) {
3193: if ($filename eq '.' || $filename eq '..') {next;}
3194: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
3195: if ($curtime-$mtime < 1800) { $numusers++; }
3196: }
3197: closedir(LONIDS);
3198: }
3199: my $userloadpercent=0;
3200: my $maxuserload=$perlvar{'lonUserLoadLim'};
3201: if ($maxuserload) {
3202: $userloadpercent=100*$numusers/$maxuserload;
3203: }
3204: $userloadpercent=sprintf("%.2f",$userloadpercent);
3205: return $userloadpercent;
3206: }
3207:
3208: # ----------------------------------- POD (plain old documentation, CPAN style)
3209:
3210: =head1 NAME
3211:
3212: lond - "LON Daemon" Server (port "LOND" 5663)
3213:
3214: =head1 SYNOPSIS
3215:
3216: Usage: B<lond>
3217:
3218: Should only be run as user=www. This is a command-line script which
3219: is invoked by B<loncron>. There is no expectation that a typical user
3220: will manually start B<lond> from the command-line. (In other words,
3221: DO NOT START B<lond> YOURSELF.)
3222:
3223: =head1 DESCRIPTION
3224:
3225: There are two characteristics associated with the running of B<lond>,
3226: PROCESS MANAGEMENT (starting, stopping, handling child processes)
3227: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
3228: subscriptions, etc). These are described in two large
3229: sections below.
3230:
3231: B<PROCESS MANAGEMENT>
3232:
3233: Preforker - server who forks first. Runs as a daemon. HUPs.
3234: Uses IDEA encryption
3235:
3236: B<lond> forks off children processes that correspond to the other servers
3237: in the network. Management of these processes can be done at the
3238: parent process level or the child process level.
3239:
3240: B<logs/lond.log> is the location of log messages.
3241:
3242: The process management is now explained in terms of linux shell commands,
3243: subroutines internal to this code, and signal assignments:
3244:
3245: =over 4
3246:
3247: =item *
3248:
3249: PID is stored in B<logs/lond.pid>
3250:
3251: This is the process id number of the parent B<lond> process.
3252:
3253: =item *
3254:
3255: SIGTERM and SIGINT
3256:
3257: Parent signal assignment:
3258: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
3259:
3260: Child signal assignment:
3261: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
3262: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
3263: to restart a new child.)
3264:
3265: Command-line invocations:
3266: B<kill> B<-s> SIGTERM I<PID>
3267: B<kill> B<-s> SIGINT I<PID>
3268:
3269: Subroutine B<HUNTSMAN>:
3270: This is only invoked for the B<lond> parent I<PID>.
3271: This kills all the children, and then the parent.
3272: The B<lonc.pid> file is cleared.
3273:
3274: =item *
3275:
3276: SIGHUP
3277:
3278: Current bug:
3279: This signal can only be processed the first time
3280: on the parent process. Subsequent SIGHUP signals
3281: have no effect.
3282:
3283: Parent signal assignment:
3284: $SIG{HUP} = \&HUPSMAN;
3285:
3286: Child signal assignment:
3287: none (nothing happens)
3288:
3289: Command-line invocations:
3290: B<kill> B<-s> SIGHUP I<PID>
3291:
3292: Subroutine B<HUPSMAN>:
3293: This is only invoked for the B<lond> parent I<PID>,
3294: This kills all the children, and then the parent.
3295: The B<lond.pid> file is cleared.
3296:
3297: =item *
3298:
3299: SIGUSR1
3300:
3301: Parent signal assignment:
3302: $SIG{USR1} = \&USRMAN;
3303:
3304: Child signal assignment:
3305: $SIG{USR1}= \&logstatus;
3306:
3307: Command-line invocations:
3308: B<kill> B<-s> SIGUSR1 I<PID>
3309:
3310: Subroutine B<USRMAN>:
3311: When invoked for the B<lond> parent I<PID>,
3312: SIGUSR1 is sent to all the children, and the status of
3313: each connection is logged.
3314:
3315: =item *
3316:
3317: SIGUSR2
3318:
3319: Parent Signal assignment:
3320: $SIG{USR2} = \&UpdateHosts
3321:
3322: Child signal assignment:
3323: NONE
3324:
3325:
3326: =item *
3327:
3328: SIGCHLD
3329:
3330: Parent signal assignment:
3331: $SIG{CHLD} = \&REAPER;
3332:
3333: Child signal assignment:
3334: none
3335:
3336: Command-line invocations:
3337: B<kill> B<-s> SIGCHLD I<PID>
3338:
3339: Subroutine B<REAPER>:
3340: This is only invoked for the B<lond> parent I<PID>.
3341: Information pertaining to the child is removed.
3342: The socket port is cleaned up.
3343:
3344: =back
3345:
3346: B<SERVER-SIDE ACTIVITIES>
3347:
3348: Server-side information can be accepted in an encrypted or non-encrypted
3349: method.
3350:
3351: =over 4
3352:
3353: =item ping
3354:
3355: Query a client in the hosts.tab table; "Are you there?"
3356:
3357: =item pong
3358:
3359: Respond to a ping query.
3360:
3361: =item ekey
3362:
3363: Read in encrypted key, make cipher. Respond with a buildkey.
3364:
3365: =item load
3366:
3367: Respond with CPU load based on a computation upon /proc/loadavg.
3368:
3369: =item currentauth
3370:
3371: Reply with current authentication information (only over an
3372: encrypted channel).
3373:
3374: =item auth
3375:
3376: Only over an encrypted channel, reply as to whether a user's
3377: authentication information can be validated.
3378:
3379: =item passwd
3380:
3381: Allow for a password to be set.
3382:
3383: =item makeuser
3384:
3385: Make a user.
3386:
3387: =item passwd
3388:
3389: Allow for authentication mechanism and password to be changed.
3390:
3391: =item home
3392:
3393: Respond to a question "are you the home for a given user?"
3394:
3395: =item update
3396:
3397: Update contents of a subscribed resource.
3398:
3399: =item unsubscribe
3400:
3401: The server is unsubscribing from a resource.
3402:
3403: =item subscribe
3404:
3405: The server is subscribing to a resource.
3406:
3407: =item log
3408:
3409: Place in B<logs/lond.log>
3410:
3411: =item put
3412:
3413: stores hash in namespace
3414:
3415: =item rolesput
3416:
3417: put a role into a user's environment
3418:
3419: =item get
3420:
3421: returns hash with keys from array
3422: reference filled in from namespace
3423:
3424: =item eget
3425:
3426: returns hash with keys from array
3427: reference filled in from namesp (encrypts the return communication)
3428:
3429: =item rolesget
3430:
3431: get a role from a user's environment
3432:
3433: =item del
3434:
3435: deletes keys out of array from namespace
3436:
3437: =item keys
3438:
3439: returns namespace keys
3440:
3441: =item dump
3442:
3443: dumps the complete (or key matching regexp) namespace into a hash
3444:
3445: =item store
3446:
3447: stores hash permanently
3448: for this url; hashref needs to be given and should be a \%hashname; the
3449: remaining args aren't required and if they aren't passed or are '' they will
3450: be derived from the ENV
3451:
3452: =item restore
3453:
3454: returns a hash for a given url
3455:
3456: =item querysend
3457:
3458: Tells client about the lonsql process that has been launched in response
3459: to a sent query.
3460:
3461: =item queryreply
3462:
3463: Accept information from lonsql and make appropriate storage in temporary
3464: file space.
3465:
3466: =item idput
3467:
3468: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
3469: for each student, defined perhaps by the institutional Registrar.)
3470:
3471: =item idget
3472:
3473: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
3474: for each student, defined perhaps by the institutional Registrar.)
3475:
3476: =item tmpput
3477:
3478: Accept and store information in temporary space.
3479:
3480: =item tmpget
3481:
3482: Send along temporarily stored information.
3483:
3484: =item ls
3485:
3486: List part of a user's directory.
3487:
3488: =item pushtable
3489:
3490: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
3491: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
3492: must be restored manually in case of a problem with the new table file.
3493: pushtable requires that the request be encrypted and validated via
3494: ValidateManager. The form of the command is:
3495: enc:pushtable tablename <tablecontents> \n
3496: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
3497: cleartext newline.
3498:
3499: =item Hanging up (exit or init)
3500:
3501: What to do when a client tells the server that they (the client)
3502: are leaving the network.
3503:
3504: =item unknown command
3505:
3506: If B<lond> is sent an unknown command (not in the list above),
3507: it replys to the client "unknown_cmd".
3508:
3509:
3510: =item UNKNOWN CLIENT
3511:
3512: If the anti-spoofing algorithm cannot verify the client,
3513: the client is rejected (with a "refused" message sent
3514: to the client, and the connection is closed.
3515:
3516: =back
3517:
3518: =head1 PREREQUISITES
3519:
3520: IO::Socket
3521: IO::File
3522: Apache::File
3523: Symbol
3524: POSIX
3525: Crypt::IDEA
3526: LWP::UserAgent()
3527: GDBM_File
3528: Authen::Krb4
3529: Authen::Krb5
3530:
3531: =head1 COREQUISITES
3532:
3533: =head1 OSNAMES
3534:
3535: linux
3536:
3537: =head1 SCRIPT CATEGORIES
3538:
3539: Server/Process
3540:
3541: =cut
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