1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.179 2004/02/24 16:53:16 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: 1.179 $'; #' 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)=unpack_sockaddr_in($caller);
1262: $clientip=inet_ntoa($iaddr);
1263:
1264: if ($pid) {
1265: # Parent records the child's birth and returns.
1266: sigprocmask(SIG_UNBLOCK, $sigset)
1267: or die "Can't unblock SIGINT for fork: $!\n";
1268: $children{$pid} = $clientip;
1269: &status('Started child '.$pid);
1270: return;
1271: } else {
1272: # Child can *not* return from this subroutine.
1273: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
1274: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
1275: #don't get intercepted
1276: $SIG{USR1}= \&logstatus;
1277: $SIG{ALRM}= \&timeout;
1278: $lastlog='Forked ';
1279: $status='Forked';
1280:
1281: # unblock signals
1282: sigprocmask(SIG_UNBLOCK, $sigset)
1283: or die "Can't unblock SIGINT for fork: $!\n";
1284:
1285: my $tmpsnum=0;
1286: #---------------------------------------------------- kerberos 5 initialization
1287: &Authen::Krb5::init_context();
1288: &Authen::Krb5::init_ets();
1289:
1290: &status('Accepted connection');
1291: # =============================================================================
1292: # do something with the connection
1293: # -----------------------------------------------------------------------------
1294: # see if we know client and check for spoof IP by challenge
1295:
1296: ReadManagerTable; # May also be a manager!!
1297:
1298: my $clientrec=($hostid{$clientip} ne undef);
1299: my $ismanager=($managers{$clientip} ne undef);
1300: $clientname = "[unknonwn]";
1301: if($clientrec) { # Establish client type.
1302: $ConnectionType = "client";
1303: $clientname = $hostid{$clientip};
1304: if($ismanager) {
1305: $ConnectionType = "both";
1306: }
1307: } else {
1308: $ConnectionType = "manager";
1309: $clientname = $managers{$clientip};
1310: }
1311: my $clientok;
1312: if ($clientrec || $ismanager) {
1313: &status("Waiting for init from $clientip $clientname");
1314: &logthis('<font color="yellow">INFO: Connection, '.
1315: $clientip.
1316: " ($clientname) connection type = $ConnectionType </font>" );
1317: &status("Connecting $clientip ($clientname))");
1318: my $remotereq=<$client>;
1319: $remotereq=~s/[^\w:]//g;
1320: if ($remotereq =~ /^init/) {
1321: &sethost("sethost:$perlvar{'lonHostID'}");
1322: my $challenge="$$".time;
1323: print $client "$challenge\n";
1324: &status(
1325: "Waiting for challenge reply from $clientip ($clientname)");
1326: $remotereq=<$client>;
1327: $remotereq=~s/\W//g;
1328: if ($challenge eq $remotereq) {
1329: $clientok=1;
1330: print $client "ok\n";
1331: } else {
1332: &logthis(
1333: "<font color=blue>WARNING: $clientip did not reply challenge</font>");
1334: &status('No challenge reply '.$clientip);
1335: }
1336: } else {
1337: &logthis(
1338: "<font color=blue>WARNING: "
1339: ."$clientip failed to initialize: >$remotereq< </font>");
1340: &status('No init '.$clientip);
1341: }
1342: } else {
1343: &logthis(
1344: "<font color=blue>WARNING: Unknown client $clientip</font>");
1345: &status('Hung up on '.$clientip);
1346: }
1347: if ($clientok) {
1348: # ---------------- New known client connecting, could mean machine online again
1349:
1350: foreach my $id (keys(%hostip)) {
1351: if ($hostip{$id} ne $clientip ||
1352: $hostip{$currenthostid} eq $clientip) {
1353: # no need to try to do recon's to myself
1354: next;
1355: }
1356: &reconlonc("$perlvar{'lonSockDir'}/$id");
1357: }
1358: &logthis("<font color=green>Established connection: $clientname</font>");
1359: &status('Will listen to '.$clientname);
1360: # ------------------------------------------------------------ Process requests
1361: while (my $userinput=<$client>) {
1362: chomp($userinput);
1363: Debug("Request = $userinput\n");
1364: &status('Processing '.$clientname.': '.$userinput);
1365: my $wasenc=0;
1366: alarm(120);
1367: # ------------------------------------------------------------ See if encrypted
1368: if ($userinput =~ /^enc/) {
1369: if ($cipher) {
1370: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
1371: $userinput='';
1372: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
1373: $userinput.=
1374: $cipher->decrypt(
1375: pack("H16",substr($encinput,$encidx,16))
1376: );
1377: }
1378: $userinput=substr($userinput,0,$cmdlength);
1379: $wasenc=1;
1380: }
1381: }
1382:
1383: # ------------------------------------------------------------- Normal commands
1384: # ------------------------------------------------------------------------ ping
1385: if ($userinput =~ /^ping/) { # client only
1386: if(isClient) {
1387: print $client "$currenthostid\n";
1388: } else {
1389: Reply($client, "refused\n", $userinput);
1390: }
1391: # ------------------------------------------------------------------------ pong
1392: }elsif ($userinput =~ /^pong/) { # client only
1393: if(isClient) {
1394: my $reply=&reply("ping",$clientname);
1395: print $client "$currenthostid:$reply\n";
1396: } else {
1397: Reply($client, "refused\n", $userinput);
1398: }
1399: # ------------------------------------------------------------------------ ekey
1400: } elsif ($userinput =~ /^ekey/) { # ok for both clients & mgrs
1401: my $buildkey=time.$$.int(rand 100000);
1402: $buildkey=~tr/1-6/A-F/;
1403: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
1404: my $key=$currenthostid.$clientname;
1405: $key=~tr/a-z/A-Z/;
1406: $key=~tr/G-P/0-9/;
1407: $key=~tr/Q-Z/0-9/;
1408: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
1409: $key=substr($key,0,32);
1410: my $cipherkey=pack("H32",$key);
1411: $cipher=new IDEA $cipherkey;
1412: print $client "$buildkey\n";
1413: # ------------------------------------------------------------------------ load
1414: } elsif ($userinput =~ /^load/) { # client only
1415: if (isClient) {
1416: my $loadavg;
1417: {
1418: my $loadfile=IO::File->new('/proc/loadavg');
1419: $loadavg=<$loadfile>;
1420: }
1421: $loadavg =~ s/\s.*//g;
1422: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1423: print $client "$loadpercent\n";
1424: } else {
1425: Reply($client, "refused\n", $userinput);
1426:
1427: }
1428: # -------------------------------------------------------------------- userload
1429: } elsif ($userinput =~ /^userload/) { # client only
1430: if(isClient) {
1431: my $userloadpercent=&userload();
1432: print $client "$userloadpercent\n";
1433: } else {
1434: Reply($client, "refused\n", $userinput);
1435:
1436: }
1437: #
1438: # Transactions requiring encryption:
1439: #
1440: # ----------------------------------------------------------------- currentauth
1441: } elsif ($userinput =~ /^currentauth/) {
1442: if (($wasenc==1) && isClient) { # Encoded & client only.
1443: my ($cmd,$udom,$uname)=split(/:/,$userinput);
1444: my $result = GetAuthType($udom, $uname);
1445: if($result eq "nouser") {
1446: print $client "unknown_user\n";
1447: }
1448: else {
1449: print $client "$result\n"
1450: }
1451: } else {
1452: Reply($client, "refused\n", $userinput);
1453:
1454: }
1455: #--------------------------------------------------------------------- pushfile
1456: } elsif($userinput =~ /^pushfile/) { # encoded & manager.
1457: if(($wasenc == 1) && isManager) {
1458: my $cert = GetCertificate($userinput);
1459: if(ValidManager($cert)) {
1460: my $reply = PushFile($userinput);
1461: print $client "$reply\n";
1462: } else {
1463: print $client "refused\n";
1464: }
1465: } else {
1466: Reply($client, "refused\n", $userinput);
1467:
1468: }
1469: #--------------------------------------------------------------------- reinit
1470: } elsif($userinput =~ /^reinit/) { # Encoded and manager
1471: if (($wasenc == 1) && isManager) {
1472: my $cert = GetCertificate($userinput);
1473: if(ValidManager($cert)) {
1474: chomp($userinput);
1475: my $reply = ReinitProcess($userinput);
1476: print $client "$reply\n";
1477: } else {
1478: print $client "refused\n";
1479: }
1480: } else {
1481: Reply($client, "refused\n", $userinput);
1482: }
1483: #------------------------------------------------------------------------- edit
1484: } elsif ($userinput =~ /^edit/) { # encoded and manager:
1485: if(($wasenc ==1) && (isManager)) {
1486: my $cert = GetCertificate($userinput);
1487: if(ValidManager($cert)) {
1488: my($command, $filetype, $script) = split(/:/, $userinput);
1489: if (($filetype eq "hosts") || ($filetype eq "domain")) {
1490: if($script ne "") {
1491: Reply($client, EditFile($userinput));
1492: } else {
1493: Reply($client,"refused\n",$userinput);
1494: }
1495: } else {
1496: Reply($client,"refused\n",$userinput);
1497: }
1498: } else {
1499: Reply($client,"refused\n",$userinput);
1500: }
1501: } else {
1502: Reply($client,"refused\n",$userinput);
1503: }
1504: # ------------------------------------------------------------------------ auth
1505: } elsif ($userinput =~ /^auth/) { # Encoded and client only.
1506: if (($wasenc==1) && isClient) {
1507: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
1508: chomp($upass);
1509: $upass=unescape($upass);
1510: my $proname=propath($udom,$uname);
1511: my $passfilename="$proname/passwd";
1512: if (-e $passfilename) {
1513: my $pf = IO::File->new($passfilename);
1514: my $realpasswd=<$pf>;
1515: chomp($realpasswd);
1516: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1517: my $pwdcorrect=0;
1518: if ($howpwd eq 'internal') {
1519: &Debug("Internal auth");
1520: $pwdcorrect=
1521: (crypt($upass,$contentpwd) eq $contentpwd);
1522: } elsif ($howpwd eq 'unix') {
1523: &Debug("Unix auth");
1524: if((getpwnam($uname))[1] eq "") { #no such user!
1525: $pwdcorrect = 0;
1526: } else {
1527: $contentpwd=(getpwnam($uname))[1];
1528: my $pwauth_path="/usr/local/sbin/pwauth";
1529: unless ($contentpwd eq 'x') {
1530: $pwdcorrect=
1531: (crypt($upass,$contentpwd) eq
1532: $contentpwd);
1533: }
1534:
1535: elsif (-e $pwauth_path) {
1536: open PWAUTH, "|$pwauth_path" or
1537: die "Cannot invoke authentication";
1538: print PWAUTH "$uname\n$upass\n";
1539: close PWAUTH;
1540: $pwdcorrect=!$?;
1541: }
1542: }
1543: } elsif ($howpwd eq 'krb4') {
1544: my $null=pack("C",0);
1545: unless ($upass=~/$null/) {
1546: my $krb4_error = &Authen::Krb4::get_pw_in_tkt
1547: ($uname,"",$contentpwd,'krbtgt',
1548: $contentpwd,1,$upass);
1549: if (!$krb4_error) {
1550: $pwdcorrect = 1;
1551: } else {
1552: $pwdcorrect=0;
1553: # log error if it is not a bad password
1554: if ($krb4_error != 62) {
1555: &logthis('krb4:'.$uname.','.$contentpwd.','.
1556: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
1557: }
1558: }
1559: }
1560: } elsif ($howpwd eq 'krb5') {
1561: my $null=pack("C",0);
1562: unless ($upass=~/$null/) {
1563: my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
1564: my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
1565: my $krbserver=&Authen::Krb5::parse_name($krbservice);
1566: my $credentials=&Authen::Krb5::cc_default();
1567: $credentials->initialize($krbclient);
1568: my $krbreturn =
1569: &Authen::Krb5::get_in_tkt_with_password(
1570: $krbclient,$krbserver,$upass,$credentials);
1571: # unless ($krbreturn) {
1572: # &logthis("Krb5 Error: ".
1573: # &Authen::Krb5::error());
1574: # }
1575: $pwdcorrect = ($krbreturn == 1);
1576: } else { $pwdcorrect=0; }
1577: } elsif ($howpwd eq 'localauth') {
1578: $pwdcorrect=&localauth::localauth($uname,$upass,
1579: $contentpwd);
1580: }
1581: if ($pwdcorrect) {
1582: print $client "authorized\n";
1583: } else {
1584: print $client "non_authorized\n";
1585: }
1586: } else {
1587: print $client "unknown_user\n";
1588: }
1589: } else {
1590: Reply($client, "refused\n", $userinput);
1591:
1592: }
1593: # ---------------------------------------------------------------------- passwd
1594: } elsif ($userinput =~ /^passwd/) { # encoded and client
1595: if (($wasenc==1) && isClient) {
1596: my
1597: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
1598: chomp($npass);
1599: $upass=&unescape($upass);
1600: $npass=&unescape($npass);
1601: &Debug("Trying to change password for $uname");
1602: my $proname=propath($udom,$uname);
1603: my $passfilename="$proname/passwd";
1604: if (-e $passfilename) {
1605: my $realpasswd;
1606: { my $pf = IO::File->new($passfilename);
1607: $realpasswd=<$pf>; }
1608: chomp($realpasswd);
1609: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1610: if ($howpwd eq 'internal') {
1611: &Debug("internal auth");
1612: if (crypt($upass,$contentpwd) eq $contentpwd) {
1613: my $salt=time;
1614: $salt=substr($salt,6,2);
1615: my $ncpass=crypt($npass,$salt);
1616: {
1617: my $pf;
1618: if ($pf = IO::File->new(">$passfilename")) {
1619: print $pf "internal:$ncpass\n";
1620: &logthis("Result of password change for $uname: pwchange_success");
1621: print $client "ok\n";
1622: } else {
1623: &logthis("Unable to open $uname passwd to change password");
1624: print $client "non_authorized\n";
1625: }
1626: }
1627:
1628: } else {
1629: print $client "non_authorized\n";
1630: }
1631: } elsif ($howpwd eq 'unix') {
1632: # Unix means we have to access /etc/password
1633: # one way or another.
1634: # First: Make sure the current password is
1635: # correct
1636: &Debug("auth is unix");
1637: $contentpwd=(getpwnam($uname))[1];
1638: my $pwdcorrect = "0";
1639: my $pwauth_path="/usr/local/sbin/pwauth";
1640: unless ($contentpwd eq 'x') {
1641: $pwdcorrect=
1642: (crypt($upass,$contentpwd) eq $contentpwd);
1643: } elsif (-e $pwauth_path) {
1644: open PWAUTH, "|$pwauth_path" or
1645: die "Cannot invoke authentication";
1646: print PWAUTH "$uname\n$upass\n";
1647: close PWAUTH;
1648: &Debug("exited pwauth with $? ($uname,$upass) ");
1649: $pwdcorrect=($? == 0);
1650: }
1651: if ($pwdcorrect) {
1652: my $execdir=$perlvar{'lonDaemons'};
1653: &Debug("Opening lcpasswd pipeline");
1654: my $pf = IO::File->new("|$execdir/lcpasswd > $perlvar{'lonDaemons'}/logs/lcpasswd.log");
1655: print $pf "$uname\n$npass\n$npass\n";
1656: close $pf;
1657: my $err = $?;
1658: my $result = ($err>0 ? 'pwchange_failure'
1659: : 'ok');
1660: &logthis("Result of password change for $uname: ".
1661: &lcpasswdstrerror($?));
1662: print $client "$result\n";
1663: } else {
1664: print $client "non_authorized\n";
1665: }
1666: } else {
1667: print $client "auth_mode_error\n";
1668: }
1669: } else {
1670: print $client "unknown_user\n";
1671: }
1672: } else {
1673: Reply($client, "refused\n", $userinput);
1674:
1675: }
1676: # -------------------------------------------------------------------- makeuser
1677: } elsif ($userinput =~ /^makeuser/) { # encoded and client.
1678: &Debug("Make user received");
1679: my $oldumask=umask(0077);
1680: if (($wasenc==1) && isClient) {
1681: my
1682: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
1683: &Debug("cmd =".$cmd." $udom =".$udom.
1684: " uname=".$uname);
1685: chomp($npass);
1686: $npass=&unescape($npass);
1687: my $proname=propath($udom,$uname);
1688: my $passfilename="$proname/passwd";
1689: &Debug("Password file created will be:".
1690: $passfilename);
1691: if (-e $passfilename) {
1692: print $client "already_exists\n";
1693: } elsif ($udom ne $currentdomainid) {
1694: print $client "not_right_domain\n";
1695: } else {
1696: my @fpparts=split(/\//,$proname);
1697: my $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
1698: my $fperror='';
1699: for (my $i=3;$i<=$#fpparts;$i++) {
1700: $fpnow.='/'.$fpparts[$i];
1701: unless (-e $fpnow) {
1702: unless (mkdir($fpnow,0777)) {
1703: $fperror="error: ".($!+0)
1704: ." mkdir failed while attempting "
1705: ."makeuser";
1706: }
1707: }
1708: }
1709: unless ($fperror) {
1710: my $result=&make_passwd_file($uname, $umode,$npass,
1711: $passfilename);
1712: print $client $result;
1713: } else {
1714: print $client "$fperror\n";
1715: }
1716: }
1717: } else {
1718: Reply($client, "refused\n", $userinput);
1719:
1720: }
1721: umask($oldumask);
1722: # -------------------------------------------------------------- changeuserauth
1723: } elsif ($userinput =~ /^changeuserauth/) { # encoded & client
1724: &Debug("Changing authorization");
1725: if (($wasenc==1) && isClient) {
1726: my
1727: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
1728: chomp($npass);
1729: &Debug("cmd = ".$cmd." domain= ".$udom.
1730: "uname =".$uname." umode= ".$umode);
1731: $npass=&unescape($npass);
1732: my $proname=&propath($udom,$uname);
1733: my $passfilename="$proname/passwd";
1734: if ($udom ne $currentdomainid) {
1735: print $client "not_right_domain\n";
1736: } else {
1737: my $result=&make_passwd_file($uname, $umode,$npass,
1738: $passfilename);
1739: print $client $result;
1740: }
1741: } else {
1742: Reply($client, "refused\n", $userinput);
1743:
1744: }
1745: # ------------------------------------------------------------------------ home
1746: } elsif ($userinput =~ /^home/) { # client clear or encoded
1747: if(isClient) {
1748: my ($cmd,$udom,$uname)=split(/:/,$userinput);
1749: chomp($uname);
1750: my $proname=propath($udom,$uname);
1751: if (-e $proname) {
1752: print $client "found\n";
1753: } else {
1754: print $client "not_found\n";
1755: }
1756: } else {
1757: Reply($client, "refused\n", $userinput);
1758:
1759: }
1760: # ---------------------------------------------------------------------- update
1761: } elsif ($userinput =~ /^update/) { # client clear or encoded.
1762: if(isClient) {
1763: my ($cmd,$fname)=split(/:/,$userinput);
1764: my $ownership=ishome($fname);
1765: if ($ownership eq 'not_owner') {
1766: if (-e $fname) {
1767: my ($dev,$ino,$mode,$nlink,
1768: $uid,$gid,$rdev,$size,
1769: $atime,$mtime,$ctime,
1770: $blksize,$blocks)=stat($fname);
1771: my $now=time;
1772: my $since=$now-$atime;
1773: if ($since>$perlvar{'lonExpire'}) {
1774: my $reply=
1775: &reply("unsub:$fname","$clientname");
1776: unlink("$fname");
1777: } else {
1778: my $transname="$fname.in.transfer";
1779: my $remoteurl=
1780: &reply("sub:$fname","$clientname");
1781: my $response;
1782: {
1783: my $ua=new LWP::UserAgent;
1784: my $request=new HTTP::Request('GET',"$remoteurl");
1785: $response=$ua->request($request,$transname);
1786: }
1787: if ($response->is_error()) {
1788: unlink($transname);
1789: my $message=$response->status_line;
1790: &logthis(
1791: "LWP GET: $message for $fname ($remoteurl)");
1792: } else {
1793: if ($remoteurl!~/\.meta$/) {
1794: my $ua=new LWP::UserAgent;
1795: my $mrequest=
1796: new HTTP::Request('GET',$remoteurl.'.meta');
1797: my $mresponse=
1798: $ua->request($mrequest,$fname.'.meta');
1799: if ($mresponse->is_error()) {
1800: unlink($fname.'.meta');
1801: }
1802: }
1803: rename($transname,$fname);
1804: }
1805: }
1806: print $client "ok\n";
1807: } else {
1808: print $client "not_found\n";
1809: }
1810: } else {
1811: print $client "rejected\n";
1812: }
1813: } else {
1814: Reply($client, "refused\n", $userinput);
1815:
1816: }
1817: # -------------------------------------- fetch a user file from a remote server
1818: } elsif ($userinput =~ /^fetchuserfile/) { # Client clear or enc.
1819: if(isClient) {
1820: my ($cmd,$fname)=split(/:/,$userinput);
1821: my ($udom,$uname,$ufile)=split(/\//,$fname);
1822: my $udir=propath($udom,$uname).'/userfiles';
1823: unless (-e $udir) { mkdir($udir,0770); }
1824: if (-e $udir) {
1825: $ufile=~s/^[\.\~]+//;
1826: $ufile=~s/\///g;
1827: my $destname=$udir.'/'.$ufile;
1828: my $transname=$udir.'/'.$ufile.'.in.transit';
1829: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
1830: my $response;
1831: {
1832: my $ua=new LWP::UserAgent;
1833: my $request=new HTTP::Request('GET',"$remoteurl");
1834: $response=$ua->request($request,$transname);
1835: }
1836: if ($response->is_error()) {
1837: unlink($transname);
1838: my $message=$response->status_line;
1839: &logthis("LWP GET: $message for $fname ($remoteurl)");
1840: print $client "failed\n";
1841: } else {
1842: if (!rename($transname,$destname)) {
1843: &logthis("Unable to move $transname to $destname");
1844: unlink($transname);
1845: print $client "failed\n";
1846: } else {
1847: print $client "ok\n";
1848: }
1849: }
1850: } else {
1851: print $client "not_home\n";
1852: }
1853: } else {
1854: Reply($client, "refused\n", $userinput);
1855:
1856: }
1857: # ------------------------------------------ authenticate access to a user file
1858: } elsif ($userinput =~ /^tokenauthuserfile/) { # Client only
1859: if(isClient) {
1860: my ($cmd,$fname,$session)=split(/:/,$userinput);
1861: chomp($session);
1862: my $reply='non_auth';
1863: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
1864: $session.'.id')) {
1865: while (my $line=<ENVIN>) {
1866: if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
1867: }
1868: close(ENVIN);
1869: print $client $reply."\n";
1870: } else {
1871: print $client "invalid_token\n";
1872: }
1873: } else {
1874: Reply($client, "refused\n", $userinput);
1875:
1876: }
1877: # ----------------------------------------------------------------- unsubscribe
1878: } elsif ($userinput =~ /^unsub/) {
1879: if(isClient) {
1880: my ($cmd,$fname)=split(/:/,$userinput);
1881: if (-e $fname) {
1882: print $client &unsub($client,$fname,$clientip);
1883: } else {
1884: print $client "not_found\n";
1885: }
1886: } else {
1887: Reply($client, "refused\n", $userinput);
1888:
1889: }
1890: # ------------------------------------------------------------------- subscribe
1891: } elsif ($userinput =~ /^sub/) {
1892: if(isClient) {
1893: print $client &subscribe($userinput,$clientip);
1894: } else {
1895: Reply($client, "refused\n", $userinput);
1896:
1897: }
1898: # ------------------------------------------------------------- current version
1899: } elsif ($userinput =~ /^currentversion/) {
1900: if(isClient) {
1901: my ($cmd,$fname)=split(/:/,$userinput);
1902: print $client ¤tversion($fname)."\n";
1903: } else {
1904: Reply($client, "refused\n", $userinput);
1905:
1906: }
1907: # ------------------------------------------------------------------------- log
1908: } elsif ($userinput =~ /^log/) {
1909: if(isClient) {
1910: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
1911: chomp($what);
1912: my $proname=propath($udom,$uname);
1913: my $now=time;
1914: {
1915: my $hfh;
1916: if ($hfh=IO::File->new(">>$proname/activity.log")) {
1917: print $hfh "$now:$clientname:$what\n";
1918: print $client "ok\n";
1919: } else {
1920: print $client "error: ".($!+0)
1921: ." IO::File->new Failed "
1922: ."while attempting log\n";
1923: }
1924: }
1925: } else {
1926: Reply($client, "refused\n", $userinput);
1927:
1928: }
1929: # ------------------------------------------------------------------------- put
1930: } elsif ($userinput =~ /^put/) {
1931: if(isClient) {
1932: my ($cmd,$udom,$uname,$namespace,$what)
1933: =split(/:/,$userinput);
1934: $namespace=~s/\//\_/g;
1935: $namespace=~s/\W//g;
1936: if ($namespace ne 'roles') {
1937: chomp($what);
1938: my $proname=propath($udom,$uname);
1939: my $now=time;
1940: unless ($namespace=~/^nohist\_/) {
1941: my $hfh;
1942: if (
1943: $hfh=IO::File->new(">>$proname/$namespace.hist")
1944: ) { print $hfh "P:$now:$what\n"; }
1945: }
1946: my @pairs=split(/\&/,$what);
1947: my %hash;
1948: if (tie(%hash,'GDBM_File',
1949: "$proname/$namespace.db",
1950: &GDBM_WRCREAT(),0640)) {
1951: foreach my $pair (@pairs) {
1952: my ($key,$value)=split(/=/,$pair);
1953: $hash{$key}=$value;
1954: }
1955: if (untie(%hash)) {
1956: print $client "ok\n";
1957: } else {
1958: print $client "error: ".($!+0)
1959: ." untie(GDBM) failed ".
1960: "while attempting put\n";
1961: }
1962: } else {
1963: print $client "error: ".($!)
1964: ." tie(GDBM) Failed ".
1965: "while attempting put\n";
1966: }
1967: } else {
1968: print $client "refused\n";
1969: }
1970: } else {
1971: Reply($client, "refused\n", $userinput);
1972:
1973: }
1974: # ------------------------------------------------------------------- inc
1975: } elsif ($userinput =~ /^inc:/) {
1976: if(isClient) {
1977: my ($cmd,$udom,$uname,$namespace,$what)
1978: =split(/:/,$userinput);
1979: $namespace=~s/\//\_/g;
1980: $namespace=~s/\W//g;
1981: if ($namespace ne 'roles') {
1982: chomp($what);
1983: my $proname=propath($udom,$uname);
1984: my $now=time;
1985: unless ($namespace=~/^nohist\_/) {
1986: my $hfh;
1987: if (
1988: $hfh=IO::File->new(">>$proname/$namespace.hist")
1989: ) { print $hfh "P:$now:$what\n"; }
1990: }
1991: my @pairs=split(/\&/,$what);
1992: my %hash;
1993: if (tie(%hash,'GDBM_File',
1994: "$proname/$namespace.db",
1995: &GDBM_WRCREAT(),0640)) {
1996: foreach my $pair (@pairs) {
1997: my ($key,$value)=split(/=/,$pair);
1998: # We could check that we have a number...
1999: if (! defined($value) || $value eq '') {
2000: $value = 1;
2001: }
2002: $hash{$key}+=$value;
2003: }
2004: if (untie(%hash)) {
2005: print $client "ok\n";
2006: } else {
2007: print $client "error: ".($!+0)
2008: ." untie(GDBM) failed ".
2009: "while attempting put\n";
2010: }
2011: } else {
2012: print $client "error: ".($!)
2013: ." tie(GDBM) Failed ".
2014: "while attempting put\n";
2015: }
2016: } else {
2017: print $client "refused\n";
2018: }
2019: } else {
2020: Reply($client, "refused\n", $userinput);
2021:
2022: }
2023: # -------------------------------------------------------------------- rolesput
2024: } elsif ($userinput =~ /^rolesput/) {
2025: if(isClient) {
2026: &Debug("rolesput");
2027: if ($wasenc==1) {
2028: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
2029: =split(/:/,$userinput);
2030: &Debug("cmd = ".$cmd." exedom= ".$exedom.
2031: "user = ".$exeuser." udom=".$udom.
2032: "what = ".$what);
2033: my $namespace='roles';
2034: chomp($what);
2035: my $proname=propath($udom,$uname);
2036: my $now=time;
2037: {
2038: my $hfh;
2039: if (
2040: $hfh=IO::File->new(">>$proname/$namespace.hist")
2041: ) {
2042: print $hfh "P:$now:$exedom:$exeuser:$what\n";
2043: }
2044: }
2045: my @pairs=split(/\&/,$what);
2046: my %hash;
2047: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2048: foreach my $pair (@pairs) {
2049: my ($key,$value)=split(/=/,$pair);
2050: &ManagePermissions($key, $udom, $uname,
2051: &GetAuthType( $udom,
2052: $uname));
2053: $hash{$key}=$value;
2054: }
2055: if (untie(%hash)) {
2056: print $client "ok\n";
2057: } else {
2058: print $client "error: ".($!+0)
2059: ." untie(GDBM) Failed ".
2060: "while attempting rolesput\n";
2061: }
2062: } else {
2063: print $client "error: ".($!+0)
2064: ." tie(GDBM) Failed ".
2065: "while attempting rolesput\n";
2066: }
2067: } else {
2068: print $client "refused\n";
2069: }
2070: } else {
2071: Reply($client, "refused\n", $userinput);
2072:
2073: }
2074: # -------------------------------------------------------------------- rolesdel
2075: } elsif ($userinput =~ /^rolesdel/) {
2076: if(isClient) {
2077: &Debug("rolesdel");
2078: if ($wasenc==1) {
2079: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
2080: =split(/:/,$userinput);
2081: &Debug("cmd = ".$cmd." exedom= ".$exedom.
2082: "user = ".$exeuser." udom=".$udom.
2083: "what = ".$what);
2084: my $namespace='roles';
2085: chomp($what);
2086: my $proname=propath($udom,$uname);
2087: my $now=time;
2088: {
2089: my $hfh;
2090: if (
2091: $hfh=IO::File->new(">>$proname/$namespace.hist")
2092: ) {
2093: print $hfh "D:$now:$exedom:$exeuser:$what\n";
2094: }
2095: }
2096: my @rolekeys=split(/\&/,$what);
2097: my %hash;
2098: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2099: foreach my $key (@rolekeys) {
2100: delete $hash{$key};
2101: }
2102: if (untie(%hash)) {
2103: print $client "ok\n";
2104: } else {
2105: print $client "error: ".($!+0)
2106: ." untie(GDBM) Failed ".
2107: "while attempting rolesdel\n";
2108: }
2109: } else {
2110: print $client "error: ".($!+0)
2111: ." tie(GDBM) Failed ".
2112: "while attempting rolesdel\n";
2113: }
2114: } else {
2115: print $client "refused\n";
2116: }
2117: } else {
2118: Reply($client, "refused\n", $userinput);
2119:
2120: }
2121: # ------------------------------------------------------------------------- get
2122: } elsif ($userinput =~ /^get/) {
2123: if(isClient) {
2124: my ($cmd,$udom,$uname,$namespace,$what)
2125: =split(/:/,$userinput);
2126: $namespace=~s/\//\_/g;
2127: $namespace=~s/\W//g;
2128: chomp($what);
2129: my @queries=split(/\&/,$what);
2130: my $proname=propath($udom,$uname);
2131: my $qresult='';
2132: my %hash;
2133: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2134: for (my $i=0;$i<=$#queries;$i++) {
2135: $qresult.="$hash{$queries[$i]}&";
2136: }
2137: if (untie(%hash)) {
2138: $qresult=~s/\&$//;
2139: print $client "$qresult\n";
2140: } else {
2141: print $client "error: ".($!+0)
2142: ." untie(GDBM) Failed ".
2143: "while attempting get\n";
2144: }
2145: } else {
2146: if ($!+0 == 2) {
2147: print $client "error:No such file or ".
2148: "GDBM reported bad block error\n";
2149: } else {
2150: print $client "error: ".($!+0)
2151: ." tie(GDBM) Failed ".
2152: "while attempting get\n";
2153: }
2154: }
2155: } else {
2156: Reply($client, "refused\n", $userinput);
2157:
2158: }
2159: # ------------------------------------------------------------------------ eget
2160: } elsif ($userinput =~ /^eget/) {
2161: if (isClient) {
2162: my ($cmd,$udom,$uname,$namespace,$what)
2163: =split(/:/,$userinput);
2164: $namespace=~s/\//\_/g;
2165: $namespace=~s/\W//g;
2166: chomp($what);
2167: my @queries=split(/\&/,$what);
2168: my $proname=propath($udom,$uname);
2169: my $qresult='';
2170: my %hash;
2171: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2172: for (my $i=0;$i<=$#queries;$i++) {
2173: $qresult.="$hash{$queries[$i]}&";
2174: }
2175: if (untie(%hash)) {
2176: $qresult=~s/\&$//;
2177: if ($cipher) {
2178: my $cmdlength=length($qresult);
2179: $qresult.=" ";
2180: my $encqresult='';
2181: for
2182: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2183: $encqresult.=
2184: unpack("H16",
2185: $cipher->encrypt(substr($qresult,$encidx,8)));
2186: }
2187: print $client "enc:$cmdlength:$encqresult\n";
2188: } else {
2189: print $client "error:no_key\n";
2190: }
2191: } else {
2192: print $client "error: ".($!+0)
2193: ." untie(GDBM) Failed ".
2194: "while attempting eget\n";
2195: }
2196: } else {
2197: print $client "error: ".($!+0)
2198: ." tie(GDBM) Failed ".
2199: "while attempting eget\n";
2200: }
2201: } else {
2202: Reply($client, "refused\n", $userinput);
2203:
2204: }
2205: # ------------------------------------------------------------------------- del
2206: } elsif ($userinput =~ /^del/) {
2207: if(isClient) {
2208: my ($cmd,$udom,$uname,$namespace,$what)
2209: =split(/:/,$userinput);
2210: $namespace=~s/\//\_/g;
2211: $namespace=~s/\W//g;
2212: chomp($what);
2213: my $proname=propath($udom,$uname);
2214: my $now=time;
2215: unless ($namespace=~/^nohist\_/) {
2216: my $hfh;
2217: if (
2218: $hfh=IO::File->new(">>$proname/$namespace.hist")
2219: ) { print $hfh "D:$now:$what\n"; }
2220: }
2221: my @keys=split(/\&/,$what);
2222: my %hash;
2223: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2224: foreach my $key (@keys) {
2225: delete($hash{$key});
2226: }
2227: if (untie(%hash)) {
2228: print $client "ok\n";
2229: } else {
2230: print $client "error: ".($!+0)
2231: ." untie(GDBM) Failed ".
2232: "while attempting del\n";
2233: }
2234: } else {
2235: print $client "error: ".($!+0)
2236: ." tie(GDBM) Failed ".
2237: "while attempting del\n";
2238: }
2239: } else {
2240: Reply($client, "refused\n", $userinput);
2241:
2242: }
2243: # ------------------------------------------------------------------------ keys
2244: } elsif ($userinput =~ /^keys/) {
2245: if(isClient) {
2246: my ($cmd,$udom,$uname,$namespace)
2247: =split(/:/,$userinput);
2248: $namespace=~s/\//\_/g;
2249: $namespace=~s/\W//g;
2250: my $proname=propath($udom,$uname);
2251: my $qresult='';
2252: my %hash;
2253: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2254: foreach my $key (keys %hash) {
2255: $qresult.="$key&";
2256: }
2257: if (untie(%hash)) {
2258: $qresult=~s/\&$//;
2259: print $client "$qresult\n";
2260: } else {
2261: print $client "error: ".($!+0)
2262: ." untie(GDBM) Failed ".
2263: "while attempting keys\n";
2264: }
2265: } else {
2266: print $client "error: ".($!+0)
2267: ." tie(GDBM) Failed ".
2268: "while attempting keys\n";
2269: }
2270: } else {
2271: Reply($client, "refused\n", $userinput);
2272:
2273: }
2274: # ----------------------------------------------------------------- dumpcurrent
2275: } elsif ($userinput =~ /^currentdump/) {
2276: if (isClient) {
2277: my ($cmd,$udom,$uname,$namespace)
2278: =split(/:/,$userinput);
2279: $namespace=~s/\//\_/g;
2280: $namespace=~s/\W//g;
2281: my $qresult='';
2282: my $proname=propath($udom,$uname);
2283: my %hash;
2284: if (tie(%hash,'GDBM_File',
2285: "$proname/$namespace.db",
2286: &GDBM_READER(),0640)) {
2287: # Structure of %data:
2288: # $data{$symb}->{$parameter}=$value;
2289: # $data{$symb}->{'v.'.$parameter}=$version;
2290: # since $parameter will be unescaped, we do not
2291: # have to worry about silly parameter names...
2292: my %data = ();
2293: while (my ($key,$value) = each(%hash)) {
2294: my ($v,$symb,$param) = split(/:/,$key);
2295: next if ($v eq 'version' || $symb eq 'keys');
2296: next if (exists($data{$symb}) &&
2297: exists($data{$symb}->{$param}) &&
2298: $data{$symb}->{'v.'.$param} > $v);
2299: $data{$symb}->{$param}=$value;
2300: $data{$symb}->{'v.'.$param}=$v;
2301: }
2302: if (untie(%hash)) {
2303: while (my ($symb,$param_hash) = each(%data)) {
2304: while(my ($param,$value) = each (%$param_hash)){
2305: next if ($param =~ /^v\./);
2306: $qresult.=$symb.':'.$param.'='.$value.'&';
2307: }
2308: }
2309: chop($qresult);
2310: print $client "$qresult\n";
2311: } else {
2312: print $client "error: ".($!+0)
2313: ." untie(GDBM) Failed ".
2314: "while attempting currentdump\n";
2315: }
2316: } else {
2317: print $client "error: ".($!+0)
2318: ." tie(GDBM) Failed ".
2319: "while attempting currentdump\n";
2320: }
2321: } else {
2322: Reply($client, "refused\n", $userinput);
2323: }
2324: # ------------------------------------------------------------------------ dump
2325: } elsif ($userinput =~ /^dump/) {
2326: if(isClient) {
2327: my ($cmd,$udom,$uname,$namespace,$regexp)
2328: =split(/:/,$userinput);
2329: $namespace=~s/\//\_/g;
2330: $namespace=~s/\W//g;
2331: if (defined($regexp)) {
2332: $regexp=&unescape($regexp);
2333: } else {
2334: $regexp='.';
2335: }
2336: my $qresult='';
2337: my $proname=propath($udom,$uname);
2338: my %hash;
2339: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2340: while (my ($key,$value) = each(%hash)) {
2341: if ($regexp eq '.') {
2342: $qresult.=$key.'='.$value.'&';
2343: } else {
2344: my $unescapeKey = &unescape($key);
2345: if (eval('$unescapeKey=~/$regexp/')) {
2346: $qresult.="$key=$value&";
2347: }
2348: }
2349: }
2350: if (untie(%hash)) {
2351: chop($qresult);
2352: print $client "$qresult\n";
2353: } else {
2354: print $client "error: ".($!+0)
2355: ." untie(GDBM) Failed ".
2356: "while attempting dump\n";
2357: }
2358: } else {
2359: print $client "error: ".($!+0)
2360: ." tie(GDBM) Failed ".
2361: "while attempting dump\n";
2362: }
2363: } else {
2364: Reply($client, "refused\n", $userinput);
2365:
2366: }
2367: # ----------------------------------------------------------------------- store
2368: } elsif ($userinput =~ /^store/) {
2369: if(isClient) {
2370: my ($cmd,$udom,$uname,$namespace,$rid,$what)
2371: =split(/:/,$userinput);
2372: $namespace=~s/\//\_/g;
2373: $namespace=~s/\W//g;
2374: if ($namespace ne 'roles') {
2375: chomp($what);
2376: my $proname=propath($udom,$uname);
2377: my $now=time;
2378: unless ($namespace=~/^nohist\_/) {
2379: my $hfh;
2380: if (
2381: $hfh=IO::File->new(">>$proname/$namespace.hist")
2382: ) { print $hfh "P:$now:$rid:$what\n"; }
2383: }
2384: my @pairs=split(/\&/,$what);
2385: my %hash;
2386: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT(),0640)) {
2387: my @previouskeys=split(/&/,$hash{"keys:$rid"});
2388: my $key;
2389: $hash{"version:$rid"}++;
2390: my $version=$hash{"version:$rid"};
2391: my $allkeys='';
2392: foreach my $pair (@pairs) {
2393: my ($key,$value)=split(/=/,$pair);
2394: $allkeys.=$key.':';
2395: $hash{"$version:$rid:$key"}=$value;
2396: }
2397: $hash{"$version:$rid:timestamp"}=$now;
2398: $allkeys.='timestamp';
2399: $hash{"$version:keys:$rid"}=$allkeys;
2400: if (untie(%hash)) {
2401: print $client "ok\n";
2402: } else {
2403: print $client "error: ".($!+0)
2404: ." untie(GDBM) Failed ".
2405: "while attempting store\n";
2406: }
2407: } else {
2408: print $client "error: ".($!+0)
2409: ." tie(GDBM) Failed ".
2410: "while attempting store\n";
2411: }
2412: } else {
2413: print $client "refused\n";
2414: }
2415: } else {
2416: Reply($client, "refused\n", $userinput);
2417:
2418: }
2419: # --------------------------------------------------------------------- restore
2420: } elsif ($userinput =~ /^restore/) {
2421: if(isClient) {
2422: my ($cmd,$udom,$uname,$namespace,$rid)
2423: =split(/:/,$userinput);
2424: $namespace=~s/\//\_/g;
2425: $namespace=~s/\W//g;
2426: chomp($rid);
2427: my $proname=propath($udom,$uname);
2428: my $qresult='';
2429: my %hash;
2430: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
2431: my $version=$hash{"version:$rid"};
2432: $qresult.="version=$version&";
2433: my $scope;
2434: for ($scope=1;$scope<=$version;$scope++) {
2435: my $vkeys=$hash{"$scope:keys:$rid"};
2436: my @keys=split(/:/,$vkeys);
2437: my $key;
2438: $qresult.="$scope:keys=$vkeys&";
2439: foreach $key (@keys) {
2440: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
2441: }
2442: }
2443: if (untie(%hash)) {
2444: $qresult=~s/\&$//;
2445: print $client "$qresult\n";
2446: } else {
2447: print $client "error: ".($!+0)
2448: ." untie(GDBM) Failed ".
2449: "while attempting restore\n";
2450: }
2451: } else {
2452: print $client "error: ".($!+0)
2453: ." tie(GDBM) Failed ".
2454: "while attempting restore\n";
2455: }
2456: } else {
2457: Reply($client, "refused\n", $userinput);
2458:
2459: }
2460: # -------------------------------------------------------------------- chatsend
2461: } elsif ($userinput =~ /^chatsend/) {
2462: if(isClient) {
2463: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
2464: &chatadd($cdom,$cnum,$newpost);
2465: print $client "ok\n";
2466: } else {
2467: Reply($client, "refused\n", $userinput);
2468:
2469: }
2470: # -------------------------------------------------------------------- chatretr
2471: } elsif ($userinput =~ /^chatretr/) {
2472: if(isClient) {
2473: my
2474: ($cmd,$cdom,$cnum,$udom,$uname)=split(/\:/,$userinput);
2475: my $reply='';
2476: foreach (&getchat($cdom,$cnum,$udom,$uname)) {
2477: $reply.=&escape($_).':';
2478: }
2479: $reply=~s/\:$//;
2480: print $client $reply."\n";
2481: } else {
2482: Reply($client, "refused\n", $userinput);
2483:
2484: }
2485: # ------------------------------------------------------------------- querysend
2486: } elsif ($userinput =~ /^querysend/) {
2487: if(isClient) {
2488: my ($cmd,$query,
2489: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
2490: $query=~s/\n*$//g;
2491: print $client "".
2492: sqlreply("$clientname\&$query".
2493: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
2494: } else {
2495: Reply($client, "refused\n", $userinput);
2496:
2497: }
2498: # ------------------------------------------------------------------ queryreply
2499: } elsif ($userinput =~ /^queryreply/) {
2500: if(isClient) {
2501: my ($cmd,$id,$reply)=split(/:/,$userinput);
2502: my $store;
2503: my $execdir=$perlvar{'lonDaemons'};
2504: if ($store=IO::File->new(">$execdir/tmp/$id")) {
2505: $reply=~s/\&/\n/g;
2506: print $store $reply;
2507: close $store;
2508: my $store2=IO::File->new(">$execdir/tmp/$id.end");
2509: print $store2 "done\n";
2510: close $store2;
2511: print $client "ok\n";
2512: }
2513: else {
2514: print $client "error: ".($!+0)
2515: ." IO::File->new Failed ".
2516: "while attempting queryreply\n";
2517: }
2518: } else {
2519: Reply($client, "refused\n", $userinput);
2520:
2521: }
2522: # ----------------------------------------------------------------- courseidput
2523: } elsif ($userinput =~ /^courseidput/) {
2524: if(isClient) {
2525: my ($cmd,$udom,$what)=split(/:/,$userinput);
2526: chomp($what);
2527: $udom=~s/\W//g;
2528: my $proname=
2529: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2530: my $now=time;
2531: my @pairs=split(/\&/,$what);
2532: my %hash;
2533: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2534: foreach my $pair (@pairs) {
2535: my ($key,$value)=split(/=/,$pair);
2536: $hash{$key}=$value.':'.$now;
2537: }
2538: if (untie(%hash)) {
2539: print $client "ok\n";
2540: } else {
2541: print $client "error: ".($!+0)
2542: ." untie(GDBM) Failed ".
2543: "while attempting courseidput\n";
2544: }
2545: } else {
2546: print $client "error: ".($!+0)
2547: ." tie(GDBM) Failed ".
2548: "while attempting courseidput\n";
2549: }
2550: } else {
2551: Reply($client, "refused\n", $userinput);
2552:
2553: }
2554: # ---------------------------------------------------------------- courseiddump
2555: } elsif ($userinput =~ /^courseiddump/) {
2556: if(isClient) {
2557: my ($cmd,$udom,$since,$description)
2558: =split(/:/,$userinput);
2559: if (defined($description)) {
2560: $description=&unescape($description);
2561: } else {
2562: $description='.';
2563: }
2564: unless (defined($since)) { $since=0; }
2565: my $qresult='';
2566: my $proname=
2567: "$perlvar{'lonUsersDir'}/$udom/nohist_courseids";
2568: my %hash;
2569: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2570: while (my ($key,$value) = each(%hash)) {
2571: my ($descr,$lasttime)=split(/\:/,$value);
2572: if ($lasttime<$since) { next; }
2573: if ($description eq '.') {
2574: $qresult.=$key.'='.$descr.'&';
2575: } else {
2576: my $unescapeVal = &unescape($descr);
2577: if (eval('$unescapeVal=~/$description/i')) {
2578: $qresult.="$key=$descr&";
2579: }
2580: }
2581: }
2582: if (untie(%hash)) {
2583: chop($qresult);
2584: print $client "$qresult\n";
2585: } else {
2586: print $client "error: ".($!+0)
2587: ." untie(GDBM) Failed ".
2588: "while attempting courseiddump\n";
2589: }
2590: } else {
2591: print $client "error: ".($!+0)
2592: ." tie(GDBM) Failed ".
2593: "while attempting courseiddump\n";
2594: }
2595: } else {
2596: Reply($client, "refused\n", $userinput);
2597:
2598: }
2599: # ----------------------------------------------------------------------- idput
2600: } elsif ($userinput =~ /^idput/) {
2601: if(isClient) {
2602: my ($cmd,$udom,$what)=split(/:/,$userinput);
2603: chomp($what);
2604: $udom=~s/\W//g;
2605: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2606: my $now=time;
2607: {
2608: my $hfh;
2609: if (
2610: $hfh=IO::File->new(">>$proname.hist")
2611: ) { print $hfh "P:$now:$what\n"; }
2612: }
2613: my @pairs=split(/\&/,$what);
2614: my %hash;
2615: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT(),0640)) {
2616: foreach my $pair (@pairs) {
2617: my ($key,$value)=split(/=/,$pair);
2618: $hash{$key}=$value;
2619: }
2620: if (untie(%hash)) {
2621: print $client "ok\n";
2622: } else {
2623: print $client "error: ".($!+0)
2624: ." untie(GDBM) Failed ".
2625: "while attempting idput\n";
2626: }
2627: } else {
2628: print $client "error: ".($!+0)
2629: ." tie(GDBM) Failed ".
2630: "while attempting idput\n";
2631: }
2632: } else {
2633: Reply($client, "refused\n", $userinput);
2634:
2635: }
2636: # ----------------------------------------------------------------------- idget
2637: } elsif ($userinput =~ /^idget/) {
2638: if(isClient) {
2639: my ($cmd,$udom,$what)=split(/:/,$userinput);
2640: chomp($what);
2641: $udom=~s/\W//g;
2642: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
2643: my @queries=split(/\&/,$what);
2644: my $qresult='';
2645: my %hash;
2646: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER(),0640)) {
2647: for (my $i=0;$i<=$#queries;$i++) {
2648: $qresult.="$hash{$queries[$i]}&";
2649: }
2650: if (untie(%hash)) {
2651: $qresult=~s/\&$//;
2652: print $client "$qresult\n";
2653: } else {
2654: print $client "error: ".($!+0)
2655: ." untie(GDBM) Failed ".
2656: "while attempting idget\n";
2657: }
2658: } else {
2659: print $client "error: ".($!+0)
2660: ." tie(GDBM) Failed ".
2661: "while attempting idget\n";
2662: }
2663: } else {
2664: Reply($client, "refused\n", $userinput);
2665:
2666: }
2667: # ---------------------------------------------------------------------- tmpput
2668: } elsif ($userinput =~ /^tmpput/) {
2669: if(isClient) {
2670: my ($cmd,$what)=split(/:/,$userinput);
2671: my $store;
2672: $tmpsnum++;
2673: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
2674: $id=~s/\W/\_/g;
2675: $what=~s/\n//g;
2676: my $execdir=$perlvar{'lonDaemons'};
2677: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
2678: print $store $what;
2679: close $store;
2680: print $client "$id\n";
2681: }
2682: else {
2683: print $client "error: ".($!+0)
2684: ."IO::File->new Failed ".
2685: "while attempting tmpput\n";
2686: }
2687: } else {
2688: Reply($client, "refused\n", $userinput);
2689:
2690: }
2691:
2692: # ---------------------------------------------------------------------- tmpget
2693: } elsif ($userinput =~ /^tmpget/) {
2694: if(isClient) {
2695: my ($cmd,$id)=split(/:/,$userinput);
2696: chomp($id);
2697: $id=~s/\W/\_/g;
2698: my $store;
2699: my $execdir=$perlvar{'lonDaemons'};
2700: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
2701: my $reply=<$store>;
2702: print $client "$reply\n";
2703: close $store;
2704: }
2705: else {
2706: print $client "error: ".($!+0)
2707: ."IO::File->new Failed ".
2708: "while attempting tmpget\n";
2709: }
2710: } else {
2711: Reply($client, "refused\n", $userinput);
2712:
2713: }
2714: # ---------------------------------------------------------------------- tmpdel
2715: } elsif ($userinput =~ /^tmpdel/) {
2716: if(isClient) {
2717: my ($cmd,$id)=split(/:/,$userinput);
2718: chomp($id);
2719: $id=~s/\W/\_/g;
2720: my $execdir=$perlvar{'lonDaemons'};
2721: if (unlink("$execdir/tmp/$id.tmp")) {
2722: print $client "ok\n";
2723: } else {
2724: print $client "error: ".($!+0)
2725: ."Unlink tmp Failed ".
2726: "while attempting tmpdel\n";
2727: }
2728: } else {
2729: Reply($client, "refused\n", $userinput);
2730:
2731: }
2732: # -------------------------------------------------------------------------- ls
2733: } elsif ($userinput =~ /^ls/) {
2734: if(isClient) {
2735: my $obs;
2736: my $rights;
2737: my ($cmd,$ulsdir)=split(/:/,$userinput);
2738: my $ulsout='';
2739: my $ulsfn;
2740: if (-e $ulsdir) {
2741: if(-d $ulsdir) {
2742: if (opendir(LSDIR,$ulsdir)) {
2743: while ($ulsfn=readdir(LSDIR)) {
2744: undef $obs, $rights;
2745: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
2746: #We do some obsolete checking here
2747: if(-e $ulsdir.'/'.$ulsfn.".meta") {
2748: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
2749: my @obsolete=<FILE>;
2750: foreach my $obsolete (@obsolete) {
2751: if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
2752: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
2753: }
2754: }
2755: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
2756: if($obs eq '1') { $ulsout.="&1"; }
2757: else { $ulsout.="&0"; }
2758: if($rights eq '1') { $ulsout.="&1:"; }
2759: else { $ulsout.="&0:"; }
2760: }
2761: closedir(LSDIR);
2762: }
2763: } else {
2764: my @ulsstats=stat($ulsdir);
2765: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
2766: }
2767: } else {
2768: $ulsout='no_such_dir';
2769: }
2770: if ($ulsout eq '') { $ulsout='empty'; }
2771: print $client "$ulsout\n";
2772: } else {
2773: Reply($client, "refused\n", $userinput);
2774:
2775: }
2776: # ----------------------------------------------------------------- setannounce
2777: } elsif ($userinput =~ /^setannounce/) {
2778: if (isClient) {
2779: my ($cmd,$announcement)=split(/:/,$userinput);
2780: chomp($announcement);
2781: $announcement=&unescape($announcement);
2782: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
2783: '/announcement.txt')) {
2784: print $store $announcement;
2785: close $store;
2786: print $client "ok\n";
2787: } else {
2788: print $client "error: ".($!+0)."\n";
2789: }
2790: } else {
2791: Reply($client, "refused\n", $userinput);
2792:
2793: }
2794: # ------------------------------------------------------------------ Hanging up
2795: } elsif (($userinput =~ /^exit/) ||
2796: ($userinput =~ /^init/)) { # no restrictions.
2797: &logthis(
2798: "Client $clientip ($clientname) hanging up: $userinput");
2799: print $client "bye\n";
2800: $client->shutdown(2); # shutdown the socket forcibly.
2801: $client->close();
2802: last;
2803:
2804: # ---------------------------------- set current host/domain
2805: } elsif ($userinput =~ /^sethost:/) {
2806: if (isClient) {
2807: print $client &sethost($userinput)."\n";
2808: } else {
2809: print $client "refused\n";
2810: }
2811: #---------------------------------- request file (?) version.
2812: } elsif ($userinput =~/^version:/) {
2813: if (isClient) {
2814: print $client &version($userinput)."\n";
2815: } else {
2816: print $client "refused\n";
2817: }
2818: # ------------------------------------------------------------- unknown command
2819:
2820: } else {
2821: # unknown command
2822: print $client "unknown_cmd\n";
2823: }
2824: # -------------------------------------------------------------------- complete
2825: alarm(0);
2826: &status('Listening to '.$clientname);
2827: }
2828: # --------------------------------------------- client unknown or fishy, refuse
2829: } else {
2830: print $client "refused\n";
2831: $client->close();
2832: &logthis("<font color=blue>WARNING: "
2833: ."Rejected client $clientip, closing connection</font>");
2834: }
2835: }
2836:
2837: # =============================================================================
2838:
2839: &logthis("<font color=red>CRITICAL: "
2840: ."Disconnect from $clientip ($clientname)</font>");
2841:
2842:
2843: # this exit is VERY important, otherwise the child will become
2844: # a producer of more and more children, forking yourself into
2845: # process death.
2846: exit;
2847:
2848: }
2849:
2850:
2851: #
2852: # Checks to see if the input roleput request was to set
2853: # an author role. If so, invokes the lchtmldir script to set
2854: # up a correct public_html
2855: # Parameters:
2856: # request - The request sent to the rolesput subchunk.
2857: # We're looking for /domain/_au
2858: # domain - The domain in which the user is having roles doctored.
2859: # user - Name of the user for which the role is being put.
2860: # authtype - The authentication type associated with the user.
2861: #
2862: sub ManagePermissions
2863: {
2864: my $request = shift;
2865: my $domain = shift;
2866: my $user = shift;
2867: my $authtype= shift;
2868:
2869: # See if the request is of the form /$domain/_au
2870: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
2871: my $execdir = $perlvar{'lonDaemons'};
2872: my $userhome= "/home/$user" ;
2873: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
2874: system("$execdir/lchtmldir $userhome $user $authtype");
2875: }
2876: }
2877: #
2878: # GetAuthType - Determines the authorization type of a user in a domain.
2879:
2880: # Returns the authorization type or nouser if there is no such user.
2881: #
2882: sub GetAuthType
2883: {
2884: my $domain = shift;
2885: my $user = shift;
2886:
2887: Debug("GetAuthType( $domain, $user ) \n");
2888: my $proname = &propath($domain, $user);
2889: my $passwdfile = "$proname/passwd";
2890: if( -e $passwdfile ) {
2891: my $pf = IO::File->new($passwdfile);
2892: my $realpassword = <$pf>;
2893: chomp($realpassword);
2894: Debug("Password info = $realpassword\n");
2895: my ($authtype, $contentpwd) = split(/:/, $realpassword);
2896: Debug("Authtype = $authtype, content = $contentpwd\n");
2897: my $availinfo = '';
2898: if($authtype eq 'krb4' or $authtype eq 'krb5') {
2899: $availinfo = $contentpwd;
2900: }
2901:
2902: return "$authtype:$availinfo";
2903: }
2904: else {
2905: Debug("Returning nouser");
2906: return "nouser";
2907: }
2908: }
2909:
2910: sub addline {
2911: my ($fname,$hostid,$ip,$newline)=@_;
2912: my $contents;
2913: my $found=0;
2914: my $expr='^'.$hostid.':'.$ip.':';
2915: $expr =~ s/\./\\\./g;
2916: my $sh;
2917: if ($sh=IO::File->new("$fname.subscription")) {
2918: while (my $subline=<$sh>) {
2919: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
2920: }
2921: $sh->close();
2922: }
2923: $sh=IO::File->new(">$fname.subscription");
2924: if ($contents) { print $sh $contents; }
2925: if ($newline) { print $sh $newline; }
2926: $sh->close();
2927: return $found;
2928: }
2929:
2930: sub getchat {
2931: my ($cdom,$cname,$udom,$uname)=@_;
2932: my %hash;
2933: my $proname=&propath($cdom,$cname);
2934: my @entries=();
2935: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
2936: &GDBM_READER(),0640)) {
2937: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
2938: untie %hash;
2939: }
2940: my @participants=();
2941: my $cutoff=time-60;
2942: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
2943: &GDBM_WRCREAT(),0640)) {
2944: $hash{$uname.':'.$udom}=time;
2945: foreach (sort keys %hash) {
2946: if ($hash{$_}>$cutoff) {
2947: $participants[$#participants+1]='active_participant:'.$_;
2948: }
2949: }
2950: untie %hash;
2951: }
2952: return (@participants,@entries);
2953: }
2954:
2955: sub chatadd {
2956: my ($cdom,$cname,$newchat)=@_;
2957: my %hash;
2958: my $proname=&propath($cdom,$cname);
2959: my @entries=();
2960: my $time=time;
2961: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
2962: &GDBM_WRCREAT(),0640)) {
2963: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
2964: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
2965: my ($thentime,$idnum)=split(/\_/,$lastid);
2966: my $newid=$time.'_000000';
2967: if ($thentime==$time) {
2968: $idnum=~s/^0+//;
2969: $idnum++;
2970: $idnum=substr('000000'.$idnum,-6,6);
2971: $newid=$time.'_'.$idnum;
2972: }
2973: $hash{$newid}=$newchat;
2974: my $expired=$time-3600;
2975: foreach (keys %hash) {
2976: my ($thistime)=($_=~/(\d+)\_/);
2977: if ($thistime<$expired) {
2978: delete $hash{$_};
2979: }
2980: }
2981: untie %hash;
2982: }
2983: {
2984: my $hfh;
2985: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
2986: print $hfh "$time:".&unescape($newchat)."\n";
2987: }
2988: }
2989: }
2990:
2991: sub unsub {
2992: my ($fname,$clientip)=@_;
2993: my $result;
2994: if (unlink("$fname.$clientname")) {
2995: $result="ok\n";
2996: } else {
2997: $result="not_subscribed\n";
2998: }
2999: if (-e "$fname.subscription") {
3000: my $found=&addline($fname,$clientname,$clientip,'');
3001: if ($found) { $result="ok\n"; }
3002: } else {
3003: if ($result != "ok\n") { $result="not_subscribed\n"; }
3004: }
3005: return $result;
3006: }
3007:
3008: sub currentversion {
3009: my $fname=shift;
3010: my $version=-1;
3011: my $ulsdir='';
3012: if ($fname=~/^(.+)\/[^\/]+$/) {
3013: $ulsdir=$1;
3014: }
3015: my ($fnamere1,$fnamere2);
3016: # remove version if already specified
3017: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
3018: # get the bits that go before and after the version number
3019: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
3020: $fnamere1=$1;
3021: $fnamere2='.'.$2;
3022: }
3023: if (-e $fname) { $version=1; }
3024: if (-e $ulsdir) {
3025: if(-d $ulsdir) {
3026: if (opendir(LSDIR,$ulsdir)) {
3027: my $ulsfn;
3028: while ($ulsfn=readdir(LSDIR)) {
3029: # see if this is a regular file (ignore links produced earlier)
3030: my $thisfile=$ulsdir.'/'.$ulsfn;
3031: unless (-l $thisfile) {
3032: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
3033: if ($1>$version) { $version=$1; }
3034: }
3035: }
3036: }
3037: closedir(LSDIR);
3038: $version++;
3039: }
3040: }
3041: }
3042: return $version;
3043: }
3044:
3045: sub thisversion {
3046: my $fname=shift;
3047: my $version=-1;
3048: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
3049: $version=$1;
3050: }
3051: return $version;
3052: }
3053:
3054: sub subscribe {
3055: my ($userinput,$clientip)=@_;
3056: my $result;
3057: my ($cmd,$fname)=split(/:/,$userinput);
3058: my $ownership=&ishome($fname);
3059: if ($ownership eq 'owner') {
3060: # explitly asking for the current version?
3061: unless (-e $fname) {
3062: my $currentversion=¤tversion($fname);
3063: if (&thisversion($fname)==$currentversion) {
3064: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
3065: my $root=$1;
3066: my $extension=$2;
3067: symlink($root.'.'.$extension,
3068: $root.'.'.$currentversion.'.'.$extension);
3069: unless ($extension=~/\.meta$/) {
3070: symlink($root.'.'.$extension.'.meta',
3071: $root.'.'.$currentversion.'.'.$extension.'.meta');
3072: }
3073: }
3074: }
3075: }
3076: if (-e $fname) {
3077: if (-d $fname) {
3078: $result="directory\n";
3079: } else {
3080: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
3081: my $now=time;
3082: my $found=&addline($fname,$clientname,$clientip,
3083: "$clientname:$clientip:$now\n");
3084: if ($found) { $result="$fname\n"; }
3085: # if they were subscribed to only meta data, delete that
3086: # subscription, when you subscribe to a file you also get
3087: # the metadata
3088: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
3089: $fname=~s/\/home\/httpd\/html\/res/raw/;
3090: $fname="http://$thisserver/".$fname;
3091: $result="$fname\n";
3092: }
3093: } else {
3094: $result="not_found\n";
3095: }
3096: } else {
3097: $result="rejected\n";
3098: }
3099: return $result;
3100: }
3101:
3102: sub make_passwd_file {
3103: my ($uname, $umode,$npass,$passfilename)=@_;
3104: my $result="ok\n";
3105: if ($umode eq 'krb4' or $umode eq 'krb5') {
3106: {
3107: my $pf = IO::File->new(">$passfilename");
3108: print $pf "$umode:$npass\n";
3109: }
3110: } elsif ($umode eq 'internal') {
3111: my $salt=time;
3112: $salt=substr($salt,6,2);
3113: my $ncpass=crypt($npass,$salt);
3114: {
3115: &Debug("Creating internal auth");
3116: my $pf = IO::File->new(">$passfilename");
3117: print $pf "internal:$ncpass\n";
3118: }
3119: } elsif ($umode eq 'localauth') {
3120: {
3121: my $pf = IO::File->new(">$passfilename");
3122: print $pf "localauth:$npass\n";
3123: }
3124: } elsif ($umode eq 'unix') {
3125: {
3126: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
3127: {
3128: &Debug("Executing external: ".$execpath);
3129: &Debug("user = ".$uname.", Password =". $npass);
3130: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
3131: print $se "$uname\n";
3132: print $se "$npass\n";
3133: print $se "$npass\n";
3134: }
3135: my $useraddok = $?;
3136: if($useraddok > 0) {
3137: &logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
3138: }
3139: my $pf = IO::File->new(">$passfilename");
3140: print $pf "unix:\n";
3141: }
3142: } elsif ($umode eq 'none') {
3143: {
3144: my $pf = IO::File->new(">$passfilename");
3145: print $pf "none:\n";
3146: }
3147: } else {
3148: $result="auth_mode_error\n";
3149: }
3150: return $result;
3151: }
3152:
3153: sub sethost {
3154: my ($remotereq) = @_;
3155: my (undef,$hostid)=split(/:/,$remotereq);
3156: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
3157: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
3158: $currenthostid=$hostid;
3159: $currentdomainid=$hostdom{$hostid};
3160: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
3161: } else {
3162: &logthis("Requested host id $hostid not an alias of ".
3163: $perlvar{'lonHostID'}." refusing connection");
3164: return 'unable_to_set';
3165: }
3166: return 'ok';
3167: }
3168:
3169: sub version {
3170: my ($userinput)=@_;
3171: $remoteVERSION=(split(/:/,$userinput))[1];
3172: return "version:$VERSION";
3173: }
3174:
3175: #There is a copy of this in lonnet.pm
3176: sub userload {
3177: my $numusers=0;
3178: {
3179: opendir(LONIDS,$perlvar{'lonIDsDir'});
3180: my $filename;
3181: my $curtime=time;
3182: while ($filename=readdir(LONIDS)) {
3183: if ($filename eq '.' || $filename eq '..') {next;}
3184: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
3185: if ($curtime-$mtime < 1800) { $numusers++; }
3186: }
3187: closedir(LONIDS);
3188: }
3189: my $userloadpercent=0;
3190: my $maxuserload=$perlvar{'lonUserLoadLim'};
3191: if ($maxuserload) {
3192: $userloadpercent=100*$numusers/$maxuserload;
3193: }
3194: $userloadpercent=sprintf("%.2f",$userloadpercent);
3195: return $userloadpercent;
3196: }
3197:
3198: # ----------------------------------- POD (plain old documentation, CPAN style)
3199:
3200: =head1 NAME
3201:
3202: lond - "LON Daemon" Server (port "LOND" 5663)
3203:
3204: =head1 SYNOPSIS
3205:
3206: Usage: B<lond>
3207:
3208: Should only be run as user=www. This is a command-line script which
3209: is invoked by B<loncron>. There is no expectation that a typical user
3210: will manually start B<lond> from the command-line. (In other words,
3211: DO NOT START B<lond> YOURSELF.)
3212:
3213: =head1 DESCRIPTION
3214:
3215: There are two characteristics associated with the running of B<lond>,
3216: PROCESS MANAGEMENT (starting, stopping, handling child processes)
3217: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
3218: subscriptions, etc). These are described in two large
3219: sections below.
3220:
3221: B<PROCESS MANAGEMENT>
3222:
3223: Preforker - server who forks first. Runs as a daemon. HUPs.
3224: Uses IDEA encryption
3225:
3226: B<lond> forks off children processes that correspond to the other servers
3227: in the network. Management of these processes can be done at the
3228: parent process level or the child process level.
3229:
3230: B<logs/lond.log> is the location of log messages.
3231:
3232: The process management is now explained in terms of linux shell commands,
3233: subroutines internal to this code, and signal assignments:
3234:
3235: =over 4
3236:
3237: =item *
3238:
3239: PID is stored in B<logs/lond.pid>
3240:
3241: This is the process id number of the parent B<lond> process.
3242:
3243: =item *
3244:
3245: SIGTERM and SIGINT
3246:
3247: Parent signal assignment:
3248: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
3249:
3250: Child signal assignment:
3251: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
3252: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
3253: to restart a new child.)
3254:
3255: Command-line invocations:
3256: B<kill> B<-s> SIGTERM I<PID>
3257: B<kill> B<-s> SIGINT I<PID>
3258:
3259: Subroutine B<HUNTSMAN>:
3260: This is only invoked for the B<lond> parent I<PID>.
3261: This kills all the children, and then the parent.
3262: The B<lonc.pid> file is cleared.
3263:
3264: =item *
3265:
3266: SIGHUP
3267:
3268: Current bug:
3269: This signal can only be processed the first time
3270: on the parent process. Subsequent SIGHUP signals
3271: have no effect.
3272:
3273: Parent signal assignment:
3274: $SIG{HUP} = \&HUPSMAN;
3275:
3276: Child signal assignment:
3277: none (nothing happens)
3278:
3279: Command-line invocations:
3280: B<kill> B<-s> SIGHUP I<PID>
3281:
3282: Subroutine B<HUPSMAN>:
3283: This is only invoked for the B<lond> parent I<PID>,
3284: This kills all the children, and then the parent.
3285: The B<lond.pid> file is cleared.
3286:
3287: =item *
3288:
3289: SIGUSR1
3290:
3291: Parent signal assignment:
3292: $SIG{USR1} = \&USRMAN;
3293:
3294: Child signal assignment:
3295: $SIG{USR1}= \&logstatus;
3296:
3297: Command-line invocations:
3298: B<kill> B<-s> SIGUSR1 I<PID>
3299:
3300: Subroutine B<USRMAN>:
3301: When invoked for the B<lond> parent I<PID>,
3302: SIGUSR1 is sent to all the children, and the status of
3303: each connection is logged.
3304:
3305: =item *
3306:
3307: SIGUSR2
3308:
3309: Parent Signal assignment:
3310: $SIG{USR2} = \&UpdateHosts
3311:
3312: Child signal assignment:
3313: NONE
3314:
3315:
3316: =item *
3317:
3318: SIGCHLD
3319:
3320: Parent signal assignment:
3321: $SIG{CHLD} = \&REAPER;
3322:
3323: Child signal assignment:
3324: none
3325:
3326: Command-line invocations:
3327: B<kill> B<-s> SIGCHLD I<PID>
3328:
3329: Subroutine B<REAPER>:
3330: This is only invoked for the B<lond> parent I<PID>.
3331: Information pertaining to the child is removed.
3332: The socket port is cleaned up.
3333:
3334: =back
3335:
3336: B<SERVER-SIDE ACTIVITIES>
3337:
3338: Server-side information can be accepted in an encrypted or non-encrypted
3339: method.
3340:
3341: =over 4
3342:
3343: =item ping
3344:
3345: Query a client in the hosts.tab table; "Are you there?"
3346:
3347: =item pong
3348:
3349: Respond to a ping query.
3350:
3351: =item ekey
3352:
3353: Read in encrypted key, make cipher. Respond with a buildkey.
3354:
3355: =item load
3356:
3357: Respond with CPU load based on a computation upon /proc/loadavg.
3358:
3359: =item currentauth
3360:
3361: Reply with current authentication information (only over an
3362: encrypted channel).
3363:
3364: =item auth
3365:
3366: Only over an encrypted channel, reply as to whether a user's
3367: authentication information can be validated.
3368:
3369: =item passwd
3370:
3371: Allow for a password to be set.
3372:
3373: =item makeuser
3374:
3375: Make a user.
3376:
3377: =item passwd
3378:
3379: Allow for authentication mechanism and password to be changed.
3380:
3381: =item home
3382:
3383: Respond to a question "are you the home for a given user?"
3384:
3385: =item update
3386:
3387: Update contents of a subscribed resource.
3388:
3389: =item unsubscribe
3390:
3391: The server is unsubscribing from a resource.
3392:
3393: =item subscribe
3394:
3395: The server is subscribing to a resource.
3396:
3397: =item log
3398:
3399: Place in B<logs/lond.log>
3400:
3401: =item put
3402:
3403: stores hash in namespace
3404:
3405: =item rolesput
3406:
3407: put a role into a user's environment
3408:
3409: =item get
3410:
3411: returns hash with keys from array
3412: reference filled in from namespace
3413:
3414: =item eget
3415:
3416: returns hash with keys from array
3417: reference filled in from namesp (encrypts the return communication)
3418:
3419: =item rolesget
3420:
3421: get a role from a user's environment
3422:
3423: =item del
3424:
3425: deletes keys out of array from namespace
3426:
3427: =item keys
3428:
3429: returns namespace keys
3430:
3431: =item dump
3432:
3433: dumps the complete (or key matching regexp) namespace into a hash
3434:
3435: =item store
3436:
3437: stores hash permanently
3438: for this url; hashref needs to be given and should be a \%hashname; the
3439: remaining args aren't required and if they aren't passed or are '' they will
3440: be derived from the ENV
3441:
3442: =item restore
3443:
3444: returns a hash for a given url
3445:
3446: =item querysend
3447:
3448: Tells client about the lonsql process that has been launched in response
3449: to a sent query.
3450:
3451: =item queryreply
3452:
3453: Accept information from lonsql and make appropriate storage in temporary
3454: file space.
3455:
3456: =item idput
3457:
3458: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
3459: for each student, defined perhaps by the institutional Registrar.)
3460:
3461: =item idget
3462:
3463: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
3464: for each student, defined perhaps by the institutional Registrar.)
3465:
3466: =item tmpput
3467:
3468: Accept and store information in temporary space.
3469:
3470: =item tmpget
3471:
3472: Send along temporarily stored information.
3473:
3474: =item ls
3475:
3476: List part of a user's directory.
3477:
3478: =item pushtable
3479:
3480: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
3481: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
3482: must be restored manually in case of a problem with the new table file.
3483: pushtable requires that the request be encrypted and validated via
3484: ValidateManager. The form of the command is:
3485: enc:pushtable tablename <tablecontents> \n
3486: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
3487: cleartext newline.
3488:
3489: =item Hanging up (exit or init)
3490:
3491: What to do when a client tells the server that they (the client)
3492: are leaving the network.
3493:
3494: =item unknown command
3495:
3496: If B<lond> is sent an unknown command (not in the list above),
3497: it replys to the client "unknown_cmd".
3498:
3499:
3500: =item UNKNOWN CLIENT
3501:
3502: If the anti-spoofing algorithm cannot verify the client,
3503: the client is rejected (with a "refused" message sent
3504: to the client, and the connection is closed.
3505:
3506: =back
3507:
3508: =head1 PREREQUISITES
3509:
3510: IO::Socket
3511: IO::File
3512: Apache::File
3513: Symbol
3514: POSIX
3515: Crypt::IDEA
3516: LWP::UserAgent()
3517: GDBM_File
3518: Authen::Krb4
3519: Authen::Krb5
3520:
3521: =head1 COREQUISITES
3522:
3523: =head1 OSNAMES
3524:
3525: linux
3526:
3527: =head1 SCRIPT CATEGORIES
3528:
3529: Server/Process
3530:
3531: =cut
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