1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.305.2.1 2006/01/27 23:05:30 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 localenroll;
49: use localstudentphoto;
50: use File::Copy;
51: use File::Find;
52: use LONCAPA::ConfigFileEdit;
53: use LONCAPA::lonlocal;
54: use LONCAPA::lonssl;
55: use Fcntl qw(:flock);
56:
57: my $DEBUG = 0; # Non zero to enable debug log entries.
58:
59: my $status='';
60: my $lastlog='';
61:
62: my $VERSION='$Revision: 1.305.2.1 $'; #' stupid emacs
63: my $remoteVERSION;
64: my $currenthostid="default";
65: my $currentdomainid;
66:
67: my $client;
68: my $clientip; # IP address of client.
69: my $clientname; # LonCAPA name of client.
70:
71: my $server;
72: my $thisserver; # DNS of us.
73:
74: my $keymode;
75:
76: my $cipher; # Cipher key negotiated with client
77: my $tmpsnum = 0; # Id of tmpputs.
78:
79: #
80: # Connection type is:
81: # client - All client actions are allowed
82: # manager - only management functions allowed.
83: # both - Both management and client actions are allowed
84: #
85:
86: my $ConnectionType;
87:
88: my %hostid; # ID's for hosts in cluster by ip.
89: my %hostdom; # LonCAPA domain for hosts in cluster.
90: my %hostip; # IPs for hosts in cluster.
91: my %hostdns; # ID's of hosts looked up by DNS name.
92:
93: my %managers; # Ip -> manager names
94:
95: my %perlvar; # Will have the apache conf defined perl vars.
96:
97: #
98: # The hash below is used for command dispatching, and is therefore keyed on the request keyword.
99: # Each element of the hash contains a reference to an array that contains:
100: # A reference to a sub that executes the request corresponding to the keyword.
101: # A flag that is true if the request must be encoded to be acceptable.
102: # A mask with bits as follows:
103: # CLIENT_OK - Set when the function is allowed by ordinary clients
104: # MANAGER_OK - Set when the function is allowed to manager clients.
105: #
106: my $CLIENT_OK = 1;
107: my $MANAGER_OK = 2;
108: my %Dispatcher;
109:
110:
111: #
112: # The array below are password error strings."
113: #
114: my $lastpwderror = 13; # Largest error number from lcpasswd.
115: my @passwderrors = ("ok",
116: "pwchange_failure - lcpasswd must be run as user 'www'",
117: "pwchange_failure - lcpasswd got incorrect number of arguments",
118: "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
119: "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
120: "pwchange_failure - lcpasswd User does not exist.",
121: "pwchange_failure - lcpasswd Incorrect current passwd",
122: "pwchange_failure - lcpasswd Unable to su to root.",
123: "pwchange_failure - lcpasswd Cannot set new passwd.",
124: "pwchange_failure - lcpasswd Username has invalid characters",
125: "pwchange_failure - lcpasswd Invalid characters in password",
126: "pwchange_failure - lcpasswd User already exists",
127: "pwchange_failure - lcpasswd Something went wrong with user addition.",
128: "pwchange_failure - lcpasswd Password mismatch",
129: "pwchange_failure - lcpasswd Error filename is invalid");
130:
131:
132: # The array below are lcuseradd error strings.:
133:
134: my $lastadderror = 13;
135: my @adderrors = ("ok",
136: "User ID mismatch, lcuseradd must run as user www",
137: "lcuseradd Incorrect number of command line parameters must be 3",
138: "lcuseradd Incorrect number of stdinput lines, must be 3",
139: "lcuseradd Too many other simultaneous pwd changes in progress",
140: "lcuseradd User does not exist",
141: "lcuseradd Unable to make www member of users's group",
142: "lcuseradd Unable to su to root",
143: "lcuseradd Unable to set password",
144: "lcuseradd Usrname has invalid characters",
145: "lcuseradd Password has an invalid character",
146: "lcuseradd User already exists",
147: "lcuseradd Could not add user.",
148: "lcuseradd Password mismatch");
149:
150:
151:
152: #
153: # Statistics that are maintained and dislayed in the status line.
154: #
155: my $Transactions = 0; # Number of attempted transactions.
156: my $Failures = 0; # Number of transcations failed.
157:
158: # ResetStatistics:
159: # Resets the statistics counters:
160: #
161: sub ResetStatistics {
162: $Transactions = 0;
163: $Failures = 0;
164: }
165:
166: #------------------------------------------------------------------------
167: #
168: # LocalConnection
169: # Completes the formation of a locally authenticated connection.
170: # This function will ensure that the 'remote' client is really the
171: # local host. If not, the connection is closed, and the function fails.
172: # If so, initcmd is parsed for the name of a file containing the
173: # IDEA session key. The fie is opened, read, deleted and the session
174: # key returned to the caller.
175: #
176: # Parameters:
177: # $Socket - Socket open on client.
178: # $initcmd - The full text of the init command.
179: #
180: # Implicit inputs:
181: # $thisserver - Our DNS name.
182: #
183: # Returns:
184: # IDEA session key on success.
185: # undef on failure.
186: #
187: sub LocalConnection {
188: my ($Socket, $initcmd) = @_;
189: Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
190: if($clientip ne "127.0.0.1") {
191: &logthis('<font color="red"> LocalConnection rejecting non local: '
192: ."$clientip ne $thisserver </font>");
193: close $Socket;
194: return undef;
195: } else {
196: chomp($initcmd); # Get rid of \n in filename.
197: my ($init, $type, $name) = split(/:/, $initcmd);
198: Debug(" Init command: $init $type $name ");
199:
200: # Require that $init = init, and $type = local: Otherwise
201: # the caller is insane:
202:
203: if(($init ne "init") && ($type ne "local")) {
204: &logthis('<font color = "red"> LocalConnection: caller is insane! '
205: ."init = $init, and type = $type </font>");
206: close($Socket);;
207: return undef;
208:
209: }
210: # Now get the key filename:
211:
212: my $IDEAKey = lonlocal::ReadKeyFile($name);
213: return $IDEAKey;
214: }
215: }
216: #------------------------------------------------------------------------------
217: #
218: # SSLConnection
219: # Completes the formation of an ssh authenticated connection. The
220: # socket is promoted to an ssl socket. If this promotion and the associated
221: # certificate exchange are successful, the IDEA key is generated and sent
222: # to the remote peer via the SSL tunnel. The IDEA key is also returned to
223: # the caller after the SSL tunnel is torn down.
224: #
225: # Parameters:
226: # Name Type Purpose
227: # $Socket IO::Socket::INET Plaintext socket.
228: #
229: # Returns:
230: # IDEA key on success.
231: # undef on failure.
232: #
233: sub SSLConnection {
234: my $Socket = shift;
235:
236: Debug("SSLConnection: ");
237: my $KeyFile = lonssl::KeyFile();
238: if(!$KeyFile) {
239: my $err = lonssl::LastError();
240: &logthis("<font color=\"red\"> CRITICAL"
241: ."Can't get key file $err </font>");
242: return undef;
243: }
244: my ($CACertificate,
245: $Certificate) = lonssl::CertificateFile();
246:
247:
248: # If any of the key, certificate or certificate authority
249: # certificate filenames are not defined, this can't work.
250:
251: if((!$Certificate) || (!$CACertificate)) {
252: my $err = lonssl::LastError();
253: &logthis("<font color=\"red\"> CRITICAL"
254: ."Can't get certificates: $err </font>");
255:
256: return undef;
257: }
258: Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
259:
260: # Indicate to our peer that we can procede with
261: # a transition to ssl authentication:
262:
263: print $Socket "ok:ssl\n";
264:
265: Debug("Approving promotion -> ssl");
266: # And do so:
267:
268: my $SSLSocket = lonssl::PromoteServerSocket($Socket,
269: $CACertificate,
270: $Certificate,
271: $KeyFile);
272: if(! ($SSLSocket) ) { # SSL socket promotion failed.
273: my $err = lonssl::LastError();
274: &logthis("<font color=\"red\"> CRITICAL "
275: ."SSL Socket promotion failed: $err </font>");
276: return undef;
277: }
278: Debug("SSL Promotion successful");
279:
280: #
281: # The only thing we'll use the socket for is to send the IDEA key
282: # to the peer:
283:
284: my $Key = lonlocal::CreateCipherKey();
285: print $SSLSocket "$Key\n";
286:
287: lonssl::Close($SSLSocket);
288:
289: Debug("Key exchange complete: $Key");
290:
291: return $Key;
292: }
293: #
294: # InsecureConnection:
295: # If insecure connections are allowd,
296: # exchange a challenge with the client to 'validate' the
297: # client (not really, but that's the protocol):
298: # We produce a challenge string that's sent to the client.
299: # The client must then echo the challenge verbatim to us.
300: #
301: # Parameter:
302: # Socket - Socket open on the client.
303: # Returns:
304: # 1 - success.
305: # 0 - failure (e.g.mismatch or insecure not allowed).
306: #
307: sub InsecureConnection {
308: my $Socket = shift;
309:
310: # Don't even start if insecure connections are not allowed.
311:
312: if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
313: return 0;
314: }
315:
316: # Fabricate a challenge string and send it..
317:
318: my $challenge = "$$".time; # pid + time.
319: print $Socket "$challenge\n";
320: &status("Waiting for challenge reply");
321:
322: my $answer = <$Socket>;
323: $answer =~s/\W//g;
324: if($challenge eq $answer) {
325: return 1;
326: } else {
327: logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
328: &status("No challenge reqply");
329: return 0;
330: }
331:
332:
333: }
334: #
335: # Safely execute a command (as long as it's not a shel command and doesn
336: # not require/rely on shell escapes. The function operates by doing a
337: # a pipe based fork and capturing stdout and stderr from the pipe.
338: #
339: # Formal Parameters:
340: # $line - A line of text to be executed as a command.
341: # Returns:
342: # The output from that command. If the output is multiline the caller
343: # must know how to split up the output.
344: #
345: #
346: sub execute_command {
347: my ($line) = @_;
348: my @words = split(/\s/, $line); # Bust the command up into words.
349: my $output = "";
350:
351: my $pid = open(CHILD, "-|");
352:
353: if($pid) { # Parent process
354: Debug("In parent process for execute_command");
355: my @data = <CHILD>; # Read the child's outupt...
356: close CHILD;
357: foreach my $output_line (@data) {
358: Debug("Adding $output_line");
359: $output .= $output_line; # Presumably has a \n on it.
360: }
361:
362: } else { # Child process
363: close (STDERR);
364: open (STDERR, ">&STDOUT");# Combine stderr, and stdout...
365: exec(@words); # won't return.
366: }
367: return $output;
368: }
369:
370:
371: # GetCertificate: Given a transaction that requires a certificate,
372: # this function will extract the certificate from the transaction
373: # request. Note that at this point, the only concept of a certificate
374: # is the hostname to which we are connected.
375: #
376: # Parameter:
377: # request - The request sent by our client (this parameterization may
378: # need to change when we really use a certificate granting
379: # authority.
380: #
381: sub GetCertificate {
382: my $request = shift;
383:
384: return $clientip;
385: }
386:
387: #
388: # Return true if client is a manager.
389: #
390: sub isManager {
391: return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
392: }
393: #
394: # Return tru if client can do client functions
395: #
396: sub isClient {
397: return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
398: }
399:
400:
401: #
402: # ReadManagerTable: Reads in the current manager table. For now this is
403: # done on each manager authentication because:
404: # - These authentications are not frequent
405: # - This allows dynamic changes to the manager table
406: # without the need to signal to the lond.
407: #
408: sub ReadManagerTable {
409:
410: # Clean out the old table first..
411:
412: foreach my $key (keys %managers) {
413: delete $managers{$key};
414: }
415:
416: my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
417: if (!open (MANAGERS, $tablename)) {
418: logthis('<font color="red">No manager table. Nobody can manage!!</font>');
419: return;
420: }
421: while(my $host = <MANAGERS>) {
422: chomp($host);
423: if ($host =~ "^#") { # Comment line.
424: next;
425: }
426: if (!defined $hostip{$host}) { # This is a non cluster member
427: # The entry is of the form:
428: # cluname:hostname
429: # cluname - A 'cluster hostname' is needed in order to negotiate
430: # the host key.
431: # hostname- The dns name of the host.
432: #
433: my($cluname, $dnsname) = split(/:/, $host);
434:
435: my $ip = gethostbyname($dnsname);
436: if(defined($ip)) { # bad names don't deserve entry.
437: my $hostip = inet_ntoa($ip);
438: $managers{$hostip} = $cluname;
439: logthis('<font color="green"> registering manager '.
440: "$dnsname as $cluname with $hostip </font>\n");
441: }
442: } else {
443: logthis('<font color="green"> existing host'." $host</font>\n");
444: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber
445: }
446: }
447: }
448:
449: #
450: # ValidManager: Determines if a given certificate represents a valid manager.
451: # in this primitive implementation, the 'certificate' is
452: # just the connecting loncapa client name. This is checked
453: # against a valid client list in the configuration.
454: #
455: #
456: sub ValidManager {
457: my $certificate = shift;
458:
459: return isManager;
460: }
461: #
462: # CopyFile: Called as part of the process of installing a
463: # new configuration file. This function copies an existing
464: # file to a backup file.
465: # Parameters:
466: # oldfile - Name of the file to backup.
467: # newfile - Name of the backup file.
468: # Return:
469: # 0 - Failure (errno has failure reason).
470: # 1 - Success.
471: #
472: sub CopyFile {
473:
474: my ($oldfile, $newfile) = @_;
475:
476: if (! copy($oldfile,$newfile)) {
477: return 0;
478: }
479: chmod(0660, $newfile);
480: return 1;
481: }
482: #
483: # Host files are passed out with externally visible host IPs.
484: # If, for example, we are behind a fire-wall or NAT host, our
485: # internally visible IP may be different than the externally
486: # visible IP. Therefore, we always adjust the contents of the
487: # host file so that the entry for ME is the IP that we believe
488: # we have. At present, this is defined as the entry that
489: # DNS has for us. If by some chance we are not able to get a
490: # DNS translation for us, then we assume that the host.tab file
491: # is correct.
492: # BUGBUGBUG - in the future, we really should see if we can
493: # easily query the interface(s) instead.
494: # Parameter(s):
495: # contents - The contents of the host.tab to check.
496: # Returns:
497: # newcontents - The adjusted contents.
498: #
499: #
500: sub AdjustHostContents {
501: my $contents = shift;
502: my $adjusted;
503: my $me = $perlvar{'lonHostID'};
504:
505: foreach my $line (split(/\n/,$contents)) {
506: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
507: chomp($line);
508: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
509: if ($id eq $me) {
510: my $ip = gethostbyname($name);
511: my $ipnew = inet_ntoa($ip);
512: $ip = $ipnew;
513: # Reconstruct the host line and append to adjusted:
514:
515: my $newline = "$id:$domain:$role:$name:$ip";
516: if($maxcon ne "") { # Not all hosts have loncnew tuning params
517: $newline .= ":$maxcon:$idleto:$mincon";
518: }
519: $adjusted .= $newline."\n";
520:
521: } else { # Not me, pass unmodified.
522: $adjusted .= $line."\n";
523: }
524: } else { # Blank or comment never re-written.
525: $adjusted .= $line."\n"; # Pass blanks and comments as is.
526: }
527: }
528: return $adjusted;
529: }
530: #
531: # InstallFile: Called to install an administrative file:
532: # - The file is created with <name>.tmp
533: # - The <name>.tmp file is then mv'd to <name>
534: # This lugubrious procedure is done to ensure that we are never without
535: # a valid, even if dated, version of the file regardless of who crashes
536: # and when the crash occurs.
537: #
538: # Parameters:
539: # Name of the file
540: # File Contents.
541: # Return:
542: # nonzero - success.
543: # 0 - failure and $! has an errno.
544: #
545: sub InstallFile {
546:
547: my ($Filename, $Contents) = @_;
548: my $TempFile = $Filename.".tmp";
549:
550: # Open the file for write:
551:
552: my $fh = IO::File->new("> $TempFile"); # Write to temp.
553: if(!(defined $fh)) {
554: &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
555: return 0;
556: }
557: # write the contents of the file:
558:
559: print $fh ($Contents);
560: $fh->close; # In case we ever have a filesystem w. locking
561:
562: chmod(0660, $TempFile);
563:
564: # Now we can move install the file in position.
565:
566: move($TempFile, $Filename);
567:
568: return 1;
569: }
570:
571:
572: #
573: # ConfigFileFromSelector: converts a configuration file selector
574: # (one of host or domain at this point) into a
575: # configuration file pathname.
576: #
577: # Parameters:
578: # selector - Configuration file selector.
579: # Returns:
580: # Full path to the file or undef if the selector is invalid.
581: #
582: sub ConfigFileFromSelector {
583: my $selector = shift;
584: my $tablefile;
585:
586: my $tabledir = $perlvar{'lonTabDir'}.'/';
587: if ($selector eq "hosts") {
588: $tablefile = $tabledir."hosts.tab";
589: } elsif ($selector eq "domain") {
590: $tablefile = $tabledir."domain.tab";
591: } else {
592: return undef;
593: }
594: return $tablefile;
595:
596: }
597: #
598: # PushFile: Called to do an administrative push of a file.
599: # - Ensure the file being pushed is one we support.
600: # - Backup the old file to <filename.saved>
601: # - Separate the contents of the new file out from the
602: # rest of the request.
603: # - Write the new file.
604: # Parameter:
605: # Request - The entire user request. This consists of a : separated
606: # string pushfile:tablename:contents.
607: # NOTE: The contents may have :'s in it as well making things a bit
608: # more interesting... but not much.
609: # Returns:
610: # String to send to client ("ok" or "refused" if bad file).
611: #
612: sub PushFile {
613: my $request = shift;
614: my ($command, $filename, $contents) = split(":", $request, 3);
615:
616: # At this point in time, pushes for only the following tables are
617: # supported:
618: # hosts.tab ($filename eq host).
619: # domain.tab ($filename eq domain).
620: # Construct the destination filename or reject the request.
621: #
622: # lonManage is supposed to ensure this, however this session could be
623: # part of some elaborate spoof that managed somehow to authenticate.
624: #
625:
626:
627: my $tablefile = ConfigFileFromSelector($filename);
628: if(! (defined $tablefile)) {
629: return "refused";
630: }
631: #
632: # >copy< the old table to the backup table
633: # don't rename in case system crashes/reboots etc. in the time
634: # window between a rename and write.
635: #
636: my $backupfile = $tablefile;
637: $backupfile =~ s/\.tab$/.old/;
638: if(!CopyFile($tablefile, $backupfile)) {
639: &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
640: return "error:$!";
641: }
642: &logthis('<font color="green"> Pushfile: backed up '
643: .$tablefile." to $backupfile</font>");
644:
645: # If the file being pushed is the host file, we adjust the entry for ourself so that the
646: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible
647: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a
648: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
649: # that possibilty.
650:
651: if($filename eq "host") {
652: $contents = AdjustHostContents($contents);
653: }
654:
655: # Install the new file:
656:
657: if(!InstallFile($tablefile, $contents)) {
658: &logthis('<font color="red"> Pushfile: unable to install '
659: .$tablefile." $! </font>");
660: return "error:$!";
661: } else {
662: &logthis('<font color="green"> Installed new '.$tablefile
663: ."</font>");
664:
665: }
666:
667:
668: # Indicate success:
669:
670: return "ok";
671:
672: }
673:
674: #
675: # Called to re-init either lonc or lond.
676: #
677: # Parameters:
678: # request - The full request by the client. This is of the form
679: # reinit:<process>
680: # where <process> is allowed to be either of
681: # lonc or lond
682: #
683: # Returns:
684: # The string to be sent back to the client either:
685: # ok - Everything worked just fine.
686: # error:why - There was a failure and why describes the reason.
687: #
688: #
689: sub ReinitProcess {
690: my $request = shift;
691:
692:
693: # separate the request (reinit) from the process identifier and
694: # validate it producing the name of the .pid file for the process.
695: #
696: #
697: my ($junk, $process) = split(":", $request);
698: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
699: if($process eq 'lonc') {
700: $processpidfile = $processpidfile."lonc.pid";
701: if (!open(PIDFILE, "< $processpidfile")) {
702: return "error:Open failed for $processpidfile";
703: }
704: my $loncpid = <PIDFILE>;
705: close(PIDFILE);
706: logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
707: ."</font>");
708: kill("USR2", $loncpid);
709: } elsif ($process eq 'lond') {
710: logthis('<font color="red"> Reinitializing self (lond) </font>');
711: &UpdateHosts; # Lond is us!!
712: } else {
713: &logthis('<font color="yellow" Invalid reinit request for '.$process
714: ."</font>");
715: return "error:Invalid process identifier $process";
716: }
717: return 'ok';
718: }
719: # Validate a line in a configuration file edit script:
720: # Validation includes:
721: # - Ensuring the command is valid.
722: # - Ensuring the command has sufficient parameters
723: # Parameters:
724: # scriptline - A line to validate (\n has been stripped for what it's worth).
725: #
726: # Return:
727: # 0 - Invalid scriptline.
728: # 1 - Valid scriptline
729: # NOTE:
730: # Only the command syntax is checked, not the executability of the
731: # command.
732: #
733: sub isValidEditCommand {
734: my $scriptline = shift;
735:
736: # Line elements are pipe separated:
737:
738: my ($command, $key, $newline) = split(/\|/, $scriptline);
739: &logthis('<font color="green"> isValideditCommand checking: '.
740: "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
741:
742: if ($command eq "delete") {
743: #
744: # key with no newline.
745: #
746: if( ($key eq "") || ($newline ne "")) {
747: return 0; # Must have key but no newline.
748: } else {
749: return 1; # Valid syntax.
750: }
751: } elsif ($command eq "replace") {
752: #
753: # key and newline:
754: #
755: if (($key eq "") || ($newline eq "")) {
756: return 0;
757: } else {
758: return 1;
759: }
760: } elsif ($command eq "append") {
761: if (($key ne "") && ($newline eq "")) {
762: return 1;
763: } else {
764: return 0;
765: }
766: } else {
767: return 0; # Invalid command.
768: }
769: return 0; # Should not get here!!!
770: }
771: #
772: # ApplyEdit - Applies an edit command to a line in a configuration
773: # file. It is the caller's responsiblity to validate the
774: # edit line.
775: # Parameters:
776: # $directive - A single edit directive to apply.
777: # Edit directives are of the form:
778: # append|newline - Appends a new line to the file.
779: # replace|key|newline - Replaces the line with key value 'key'
780: # delete|key - Deletes the line with key value 'key'.
781: # $editor - A config file editor object that contains the
782: # file being edited.
783: #
784: sub ApplyEdit {
785:
786: my ($directive, $editor) = @_;
787:
788: # Break the directive down into its command and its parameters
789: # (at most two at this point. The meaning of the parameters, if in fact
790: # they exist depends on the command).
791:
792: my ($command, $p1, $p2) = split(/\|/, $directive);
793:
794: if($command eq "append") {
795: $editor->Append($p1); # p1 - key p2 null.
796: } elsif ($command eq "replace") {
797: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline.
798: } elsif ($command eq "delete") {
799: $editor->DeleteLine($p1); # p1 - key p2 null.
800: } else { # Should not get here!!!
801: die "Invalid command given to ApplyEdit $command"
802: }
803: }
804: #
805: # AdjustOurHost:
806: # Adjusts a host file stored in a configuration file editor object
807: # for the true IP address of this host. This is necessary for hosts
808: # that live behind a firewall.
809: # Those hosts have a publicly distributed IP of the firewall, but
810: # internally must use their actual IP. We assume that a given
811: # host only has a single IP interface for now.
812: # Formal Parameters:
813: # editor - The configuration file editor to adjust. This
814: # editor is assumed to contain a hosts.tab file.
815: # Strategy:
816: # - Figure out our hostname.
817: # - Lookup the entry for this host.
818: # - Modify the line to contain our IP
819: # - Do a replace for this host.
820: sub AdjustOurHost {
821: my $editor = shift;
822:
823: # figure out who I am.
824:
825: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname.
826:
827: # Get my host file entry.
828:
829: my $ConfigLine = $editor->Find($myHostName);
830: if(! (defined $ConfigLine)) {
831: die "AdjustOurHost - no entry for me in hosts file $myHostName";
832: }
833: # figure out my IP:
834: # Use the config line to get my hostname.
835: # Use gethostbyname to translate that into an IP address.
836: #
837: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
838: my $BinaryIp = gethostbyname($name);
839: my $ip = inet_ntoa($ip);
840: #
841: # Reassemble the config line from the elements in the list.
842: # Note that if the loncnew items were not present before, they will
843: # be now even if they would be empty
844: #
845: my $newConfigLine = $id;
846: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
847: $newConfigLine .= ":".$item;
848: }
849: # Replace the line:
850:
851: $editor->ReplaceLine($id, $newConfigLine);
852:
853: }
854: #
855: # ReplaceConfigFile:
856: # Replaces a configuration file with the contents of a
857: # configuration file editor object.
858: # This is done by:
859: # - Copying the target file to <filename>.old
860: # - Writing the new file to <filename>.tmp
861: # - Moving <filename.tmp> -> <filename>
862: # This laborious process ensures that the system is never without
863: # a configuration file that's at least valid (even if the contents
864: # may be dated).
865: # Parameters:
866: # filename - Name of the file to modify... this is a full path.
867: # editor - Editor containing the file.
868: #
869: sub ReplaceConfigFile {
870:
871: my ($filename, $editor) = @_;
872:
873: CopyFile ($filename, $filename.".old");
874:
875: my $contents = $editor->Get(); # Get the contents of the file.
876:
877: InstallFile($filename, $contents);
878: }
879: #
880: #
881: # Called to edit a configuration table file
882: # Parameters:
883: # request - The entire command/request sent by lonc or lonManage
884: # Return:
885: # The reply to send to the client.
886: #
887: sub EditFile {
888: my $request = shift;
889:
890: # Split the command into it's pieces: edit:filetype:script
891:
892: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script
893:
894: # Check the pre-coditions for success:
895:
896: if($request != "edit") { # Something is amiss afoot alack.
897: return "error:edit request detected, but request != 'edit'\n";
898: }
899: if( ($filetype ne "hosts") &&
900: ($filetype ne "domain")) {
901: return "error:edit requested with invalid file specifier: $filetype \n";
902: }
903:
904: # Split the edit script and check it's validity.
905:
906: my @scriptlines = split(/\n/, $script); # one line per element.
907: my $linecount = scalar(@scriptlines);
908: for(my $i = 0; $i < $linecount; $i++) {
909: chomp($scriptlines[$i]);
910: if(!isValidEditCommand($scriptlines[$i])) {
911: return "error:edit with bad script line: '$scriptlines[$i]' \n";
912: }
913: }
914:
915: # Execute the edit operation.
916: # - Create a config file editor for the appropriate file and
917: # - execute each command in the script:
918: #
919: my $configfile = ConfigFileFromSelector($filetype);
920: if (!(defined $configfile)) {
921: return "refused\n";
922: }
923: my $editor = ConfigFileEdit->new($configfile);
924:
925: for (my $i = 0; $i < $linecount; $i++) {
926: ApplyEdit($scriptlines[$i], $editor);
927: }
928: # If the file is the host file, ensure that our host is
929: # adjusted to have our ip:
930: #
931: if($filetype eq "host") {
932: AdjustOurHost($editor);
933: }
934: # Finally replace the current file with our file.
935: #
936: ReplaceConfigFile($configfile, $editor);
937:
938: return "ok\n";
939: }
940:
941: #---------------------------------------------------------------
942: #
943: # Manipulation of hash based databases (factoring out common code
944: # for later use as we refactor.
945: #
946: # Ties a domain level resource file to a hash.
947: # If requested a history entry is created in the associated hist file.
948: #
949: # Parameters:
950: # domain - Name of the domain in which the resource file lives.
951: # namespace - Name of the hash within that domain.
952: # how - How to tie the hash (e.g. GDBM_WRCREAT()).
953: # loghead - Optional parameter, if present a log entry is created
954: # in the associated history file and this is the first part
955: # of that entry.
956: # logtail - Goes along with loghead, The actual logentry is of the
957: # form $loghead:<timestamp>:logtail.
958: # Returns:
959: # Reference to a hash bound to the db file or alternatively undef
960: # if the tie failed.
961: #
962: sub tie_domain_hash {
963: my ($domain,$namespace,$how,$loghead,$logtail) = @_;
964:
965: # Filter out any whitespace in the domain name:
966:
967: $domain =~ s/\W//g;
968:
969: # We have enough to go on to tie the hash:
970:
971: my $user_top_dir = $perlvar{'lonUsersDir'};
972: my $domain_dir = $user_top_dir."/$domain";
973: my $resource_file = $domain_dir."/$namespace.db";
974: my %hash;
975: if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
976: if (defined($loghead)) { # Need to log the operation.
977: my $logFh = IO::File->new(">>$domain_dir/$namespace.hist");
978: if($logFh) {
979: my $timestamp = time;
980: print $logFh "$loghead:$timestamp:$logtail\n";
981: }
982: $logFh->close;
983: }
984: return \%hash; # Return the tied hash.
985: } else {
986: return undef; # Tie failed.
987: }
988: }
989:
990: #
991: # Ties a user's resource file to a hash.
992: # If necessary, an appropriate history
993: # log file entry is made as well.
994: # This sub factors out common code from the subs that manipulate
995: # the various gdbm files that keep keyword value pairs.
996: # Parameters:
997: # domain - Name of the domain the user is in.
998: # user - Name of the 'current user'.
999: # namespace - Namespace representing the file to tie.
1000: # how - What the tie is done to (e.g. GDBM_WRCREAT().
1001: # loghead - Optional first part of log entry if there may be a
1002: # history file.
1003: # what - Optional tail of log entry if there may be a history
1004: # file.
1005: # Returns:
1006: # hash to which the database is tied. It's up to the caller to untie.
1007: # undef if the has could not be tied.
1008: #
1009: sub tie_user_hash {
1010: my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
1011:
1012: $namespace=~s/\//\_/g; # / -> _
1013: $namespace=~s/\W//g; # whitespace eliminated.
1014: my $proname = propath($domain, $user);
1015:
1016: # Tie the database.
1017:
1018: my %hash;
1019: if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
1020: $how, 0640)) {
1021: # If this is a namespace for which a history is kept,
1022: # make the history log entry:
1023: if (($namespace !~/^nohist\_/) && (defined($loghead))) {
1024: my $args = scalar @_;
1025: Debug(" Opening history: $namespace $args");
1026: my $hfh = IO::File->new(">>$proname/$namespace.hist");
1027: if($hfh) {
1028: my $now = time;
1029: print $hfh "$loghead:$now:$what\n";
1030: }
1031: $hfh->close;
1032: }
1033: return \%hash;
1034: } else {
1035: return undef;
1036: }
1037:
1038: }
1039:
1040: # read_profile
1041: #
1042: # Returns a set of specific entries from a user's profile file.
1043: # this is a utility function that is used by both get_profile_entry and
1044: # get_profile_entry_encrypted.
1045: #
1046: # Parameters:
1047: # udom - Domain in which the user exists.
1048: # uname - User's account name (loncapa account)
1049: # namespace - The profile namespace to open.
1050: # what - A set of & separated queries.
1051: # Returns:
1052: # If all ok: - The string that needs to be shipped back to the user.
1053: # If failure - A string that starts with error: followed by the failure
1054: # reason.. note that this probabyl gets shipped back to the
1055: # user as well.
1056: #
1057: sub read_profile {
1058: my ($udom, $uname, $namespace, $what) = @_;
1059:
1060: my $hashref = &tie_user_hash($udom, $uname, $namespace,
1061: &GDBM_READER());
1062: if ($hashref) {
1063: my @queries=split(/\&/,$what);
1064: my $qresult='';
1065:
1066: for (my $i=0;$i<=$#queries;$i++) {
1067: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string.
1068: }
1069: $qresult=~s/\&$//; # Remove trailing & from last lookup.
1070: if (untie %$hashref) {
1071: return $qresult;
1072: } else {
1073: return "error: ".($!+0)." untie (GDBM) Failed";
1074: }
1075: } else {
1076: if ($!+0 == 2) {
1077: return "error:No such file or GDBM reported bad block error";
1078: } else {
1079: return "error: ".($!+0)." tie (GDBM) Failed";
1080: }
1081: }
1082:
1083: }
1084: #--------------------- Request Handlers --------------------------------------------
1085: #
1086: # By convention each request handler registers itself prior to the sub
1087: # declaration:
1088: #
1089:
1090: #++
1091: #
1092: # Handles ping requests.
1093: # Parameters:
1094: # $cmd - the actual keyword that invoked us.
1095: # $tail - the tail of the request that invoked us.
1096: # $replyfd- File descriptor connected to the client
1097: # Implicit Inputs:
1098: # $currenthostid - Global variable that carries the name of the host we are
1099: # known as.
1100: # Returns:
1101: # 1 - Ok to continue processing.
1102: # 0 - Program should exit.
1103: # Side effects:
1104: # Reply information is sent to the client.
1105: sub ping_handler {
1106: my ($cmd, $tail, $client) = @_;
1107: Debug("$cmd $tail $client .. $currenthostid:");
1108:
1109: Reply( $client,"$currenthostid\n","$cmd:$tail");
1110:
1111: return 1;
1112: }
1113: ®ister_handler("ping", \&ping_handler, 0, 1, 1); # Ping unencoded, client or manager.
1114:
1115: #++
1116: #
1117: # Handles pong requests. Pong replies with our current host id, and
1118: # the results of a ping sent to us via our lonc.
1119: #
1120: # Parameters:
1121: # $cmd - the actual keyword that invoked us.
1122: # $tail - the tail of the request that invoked us.
1123: # $replyfd- File descriptor connected to the client
1124: # Implicit Inputs:
1125: # $currenthostid - Global variable that carries the name of the host we are
1126: # connected to.
1127: # Returns:
1128: # 1 - Ok to continue processing.
1129: # 0 - Program should exit.
1130: # Side effects:
1131: # Reply information is sent to the client.
1132: sub pong_handler {
1133: my ($cmd, $tail, $replyfd) = @_;
1134:
1135: my $reply=&reply("ping",$clientname);
1136: &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
1137: return 1;
1138: }
1139: ®ister_handler("pong", \&pong_handler, 0, 1, 1); # Pong unencoded, client or manager
1140:
1141: #++
1142: # Called to establish an encrypted session key with the remote client.
1143: # Note that with secure lond, in most cases this function is never
1144: # invoked. Instead, the secure session key is established either
1145: # via a local file that's locked down tight and only lives for a short
1146: # time, or via an ssl tunnel...and is generated from a bunch-o-random
1147: # bits from /dev/urandom, rather than the predictable pattern used by
1148: # by this sub. This sub is only used in the old-style insecure
1149: # key negotiation.
1150: # Parameters:
1151: # $cmd - the actual keyword that invoked us.
1152: # $tail - the tail of the request that invoked us.
1153: # $replyfd- File descriptor connected to the client
1154: # Implicit Inputs:
1155: # $currenthostid - Global variable that carries the name of the host
1156: # known as.
1157: # $clientname - Global variable that carries the name of the hsot we're connected to.
1158: # Returns:
1159: # 1 - Ok to continue processing.
1160: # 0 - Program should exit.
1161: # Implicit Outputs:
1162: # Reply information is sent to the client.
1163: # $cipher is set with a reference to a new IDEA encryption object.
1164: #
1165: sub establish_key_handler {
1166: my ($cmd, $tail, $replyfd) = @_;
1167:
1168: my $buildkey=time.$$.int(rand 100000);
1169: $buildkey=~tr/1-6/A-F/;
1170: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
1171: my $key=$currenthostid.$clientname;
1172: $key=~tr/a-z/A-Z/;
1173: $key=~tr/G-P/0-9/;
1174: $key=~tr/Q-Z/0-9/;
1175: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
1176: $key=substr($key,0,32);
1177: my $cipherkey=pack("H32",$key);
1178: $cipher=new IDEA $cipherkey;
1179: &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
1180:
1181: return 1;
1182:
1183: }
1184: ®ister_handler("ekey", \&establish_key_handler, 0, 1,1);
1185:
1186: # Handler for the load command. Returns the current system load average
1187: # to the requestor.
1188: #
1189: # Parameters:
1190: # $cmd - the actual keyword that invoked us.
1191: # $tail - the tail of the request that invoked us.
1192: # $replyfd- File descriptor connected to the client
1193: # Implicit Inputs:
1194: # $currenthostid - Global variable that carries the name of the host
1195: # known as.
1196: # $clientname - Global variable that carries the name of the hsot we're connected to.
1197: # Returns:
1198: # 1 - Ok to continue processing.
1199: # 0 - Program should exit.
1200: # Side effects:
1201: # Reply information is sent to the client.
1202: sub load_handler {
1203: my ($cmd, $tail, $replyfd) = @_;
1204:
1205: # Get the load average from /proc/loadavg and calculate it as a percentage of
1206: # the allowed load limit as set by the perl global variable lonLoadLim
1207:
1208: my $loadavg;
1209: my $loadfile=IO::File->new('/proc/loadavg');
1210:
1211: $loadavg=<$loadfile>;
1212: $loadavg =~ s/\s.*//g; # Extract the first field only.
1213:
1214: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1215:
1216: &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
1217:
1218: return 1;
1219: }
1220: ®ister_handler("load", \&load_handler, 0, 1, 0);
1221:
1222: #
1223: # Process the userload request. This sub returns to the client the current
1224: # user load average. It can be invoked either by clients or managers.
1225: #
1226: # Parameters:
1227: # $cmd - the actual keyword that invoked us.
1228: # $tail - the tail of the request that invoked us.
1229: # $replyfd- File descriptor connected to the client
1230: # Implicit Inputs:
1231: # $currenthostid - Global variable that carries the name of the host
1232: # known as.
1233: # $clientname - Global variable that carries the name of the hsot we're connected to.
1234: # Returns:
1235: # 1 - Ok to continue processing.
1236: # 0 - Program should exit
1237: # Implicit inputs:
1238: # whatever the userload() function requires.
1239: # Implicit outputs:
1240: # the reply is written to the client.
1241: #
1242: sub user_load_handler {
1243: my ($cmd, $tail, $replyfd) = @_;
1244:
1245: my $userloadpercent=&userload();
1246: &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
1247:
1248: return 1;
1249: }
1250: ®ister_handler("userload", \&user_load_handler, 0, 1, 0);
1251:
1252: # Process a request for the authorization type of a user:
1253: # (userauth).
1254: #
1255: # Parameters:
1256: # $cmd - the actual keyword that invoked us.
1257: # $tail - the tail of the request that invoked us.
1258: # $replyfd- File descriptor connected to the client
1259: # Returns:
1260: # 1 - Ok to continue processing.
1261: # 0 - Program should exit
1262: # Implicit outputs:
1263: # The user authorization type is written to the client.
1264: #
1265: sub user_authorization_type {
1266: my ($cmd, $tail, $replyfd) = @_;
1267:
1268: my $userinput = "$cmd:$tail";
1269:
1270: # Pull the domain and username out of the command tail.
1271: # and call get_auth_type to determine the authentication type.
1272:
1273: my ($udom,$uname)=split(/:/,$tail);
1274: my $result = &get_auth_type($udom, $uname);
1275: if($result eq "nouser") {
1276: &Failure( $replyfd, "unknown_user\n", $userinput);
1277: } else {
1278: #
1279: # We only want to pass the second field from get_auth_type
1280: # for ^krb.. otherwise we'll be handing out the encrypted
1281: # password for internals e.g.
1282: #
1283: my ($type,$otherinfo) = split(/:/,$result);
1284: if($type =~ /^krb/) {
1285: $type = $result;
1286: } else {
1287: $type .= ':';
1288: }
1289: &Reply( $replyfd, "$type\n", $userinput);
1290: }
1291:
1292: return 1;
1293: }
1294: ®ister_handler("currentauth", \&user_authorization_type, 1, 1, 0);
1295:
1296: # Process a request by a manager to push a hosts or domain table
1297: # to us. We pick apart the command and pass it on to the subs
1298: # that already exist to do this.
1299: #
1300: # Parameters:
1301: # $cmd - the actual keyword that invoked us.
1302: # $tail - the tail of the request that invoked us.
1303: # $client - File descriptor connected to the client
1304: # Returns:
1305: # 1 - Ok to continue processing.
1306: # 0 - Program should exit
1307: # Implicit Output:
1308: # a reply is written to the client.
1309: sub push_file_handler {
1310: my ($cmd, $tail, $client) = @_;
1311:
1312: my $userinput = "$cmd:$tail";
1313:
1314: # At this time we only know that the IP of our partner is a valid manager
1315: # the code below is a hook to do further authentication (e.g. to resolve
1316: # spoofing).
1317:
1318: my $cert = &GetCertificate($userinput);
1319: if(&ValidManager($cert)) {
1320:
1321: # Now presumably we have the bona fides of both the peer host and the
1322: # process making the request.
1323:
1324: my $reply = &PushFile($userinput);
1325: &Reply($client, "$reply\n", $userinput);
1326:
1327: } else {
1328: &Failure( $client, "refused\n", $userinput);
1329: }
1330: return 1;
1331: }
1332: ®ister_handler("pushfile", \&push_file_handler, 1, 0, 1);
1333:
1334: #
1335: # du - list the disk usuage of a directory recursively.
1336: #
1337: # note: stolen code from the ls file handler
1338: # under construction by Rick Banghart
1339: # .
1340: # Parameters:
1341: # $cmd - The command that dispatched us (du).
1342: # $ududir - The directory path to list... I'm not sure what this
1343: # is relative as things like ls:. return e.g.
1344: # no_such_dir.
1345: # $client - Socket open on the client.
1346: # Returns:
1347: # 1 - indicating that the daemon should not disconnect.
1348: # Side Effects:
1349: # The reply is written to $client.
1350: #
1351: sub du_handler {
1352: my ($cmd, $ududir, $client) = @_;
1353: my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
1354: my $userinput = "$cmd:$ududir";
1355:
1356: if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
1357: &Failure($client,"refused\n","$cmd:$ududir");
1358: return 1;
1359: }
1360: # Since $ududir could have some nasties in it,
1361: # we will require that ududir is a valid
1362: # directory. Just in case someone tries to
1363: # slip us a line like .;(cd /home/httpd rm -rf*)
1364: # etc.
1365: #
1366: if (-d $ududir) {
1367: my $total_size=0;
1368: my $code=sub {
1369: if ($_=~/\.\d+\./) { return;}
1370: if ($_=~/\.meta$/) { return;}
1371: $total_size+=(stat($_))[7];
1372: };
1373: chdir($ududir);
1374: find($code,$ududir);
1375: $total_size=int($total_size/1024);
1376: &Reply($client,"$total_size\n","$cmd:$ududir");
1377: } else {
1378: &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
1379: }
1380: return 1;
1381: }
1382: ®ister_handler("du", \&du_handler, 0, 1, 0);
1383:
1384: #
1385: # The ls_handler routine should be considered obosolete and is retained
1386: # for communication with legacy servers. Please see the ls2_handler.
1387: #
1388: # ls - list the contents of a directory. For each file in the
1389: # selected directory the filename followed by the full output of
1390: # the stat function is returned. The returned info for each
1391: # file are separated by ':'. The stat fields are separated by &'s.
1392: # Parameters:
1393: # $cmd - The command that dispatched us (ls).
1394: # $ulsdir - The directory path to list... I'm not sure what this
1395: # is relative as things like ls:. return e.g.
1396: # no_such_dir.
1397: # $client - Socket open on the client.
1398: # Returns:
1399: # 1 - indicating that the daemon should not disconnect.
1400: # Side Effects:
1401: # The reply is written to $client.
1402: #
1403: sub ls_handler {
1404: # obsoleted by ls2_handler
1405: my ($cmd, $ulsdir, $client) = @_;
1406:
1407: my $userinput = "$cmd:$ulsdir";
1408:
1409: my $obs;
1410: my $rights;
1411: my $ulsout='';
1412: my $ulsfn;
1413: if (-e $ulsdir) {
1414: if(-d $ulsdir) {
1415: if (opendir(LSDIR,$ulsdir)) {
1416: while ($ulsfn=readdir(LSDIR)) {
1417: undef($obs);
1418: undef($rights);
1419: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1420: #We do some obsolete checking here
1421: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1422: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1423: my @obsolete=<FILE>;
1424: foreach my $obsolete (@obsolete) {
1425: if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
1426: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
1427: }
1428: }
1429: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
1430: if($obs eq '1') { $ulsout.="&1"; }
1431: else { $ulsout.="&0"; }
1432: if($rights eq '1') { $ulsout.="&1:"; }
1433: else { $ulsout.="&0:"; }
1434: }
1435: closedir(LSDIR);
1436: }
1437: } else {
1438: my @ulsstats=stat($ulsdir);
1439: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1440: }
1441: } else {
1442: $ulsout='no_such_dir';
1443: }
1444: if ($ulsout eq '') { $ulsout='empty'; }
1445: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1446:
1447: return 1;
1448:
1449: }
1450: ®ister_handler("ls", \&ls_handler, 0, 1, 0);
1451:
1452: #
1453: # Please also see the ls_handler, which this routine obosolets.
1454: # ls2_handler differs from ls_handler in that it escapes its return
1455: # values before concatenating them together with ':'s.
1456: #
1457: # ls2 - list the contents of a directory. For each file in the
1458: # selected directory the filename followed by the full output of
1459: # the stat function is returned. The returned info for each
1460: # file are separated by ':'. The stat fields are separated by &'s.
1461: # Parameters:
1462: # $cmd - The command that dispatched us (ls).
1463: # $ulsdir - The directory path to list... I'm not sure what this
1464: # is relative as things like ls:. return e.g.
1465: # no_such_dir.
1466: # $client - Socket open on the client.
1467: # Returns:
1468: # 1 - indicating that the daemon should not disconnect.
1469: # Side Effects:
1470: # The reply is written to $client.
1471: #
1472: sub ls2_handler {
1473: my ($cmd, $ulsdir, $client) = @_;
1474:
1475: my $userinput = "$cmd:$ulsdir";
1476:
1477: my $obs;
1478: my $rights;
1479: my $ulsout='';
1480: my $ulsfn;
1481: if (-e $ulsdir) {
1482: if(-d $ulsdir) {
1483: if (opendir(LSDIR,$ulsdir)) {
1484: while ($ulsfn=readdir(LSDIR)) {
1485: undef($obs);
1486: undef($rights);
1487: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1488: #We do some obsolete checking here
1489: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1490: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1491: my @obsolete=<FILE>;
1492: foreach my $obsolete (@obsolete) {
1493: if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
1494: if($obsolete =~ m|(<copyright>)(default)|) {
1495: $rights = 1;
1496: }
1497: }
1498: }
1499: my $tmp = $ulsfn.'&'.join('&',@ulsstats);
1500: if ($obs eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1501: if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1502: $ulsout.= &escape($tmp).':';
1503: }
1504: closedir(LSDIR);
1505: }
1506: } else {
1507: my @ulsstats=stat($ulsdir);
1508: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1509: }
1510: } else {
1511: $ulsout='no_such_dir';
1512: }
1513: if ($ulsout eq '') { $ulsout='empty'; }
1514: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1515: return 1;
1516: }
1517: ®ister_handler("ls2", \&ls2_handler, 0, 1, 0);
1518:
1519: # Process a reinit request. Reinit requests that either
1520: # lonc or lond be reinitialized so that an updated
1521: # host.tab or domain.tab can be processed.
1522: #
1523: # Parameters:
1524: # $cmd - the actual keyword that invoked us.
1525: # $tail - the tail of the request that invoked us.
1526: # $client - File descriptor connected to the client
1527: # Returns:
1528: # 1 - Ok to continue processing.
1529: # 0 - Program should exit
1530: # Implicit output:
1531: # a reply is sent to the client.
1532: #
1533: sub reinit_process_handler {
1534: my ($cmd, $tail, $client) = @_;
1535:
1536: my $userinput = "$cmd:$tail";
1537:
1538: my $cert = &GetCertificate($userinput);
1539: if(&ValidManager($cert)) {
1540: chomp($userinput);
1541: my $reply = &ReinitProcess($userinput);
1542: &Reply( $client, "$reply\n", $userinput);
1543: } else {
1544: &Failure( $client, "refused\n", $userinput);
1545: }
1546: return 1;
1547: }
1548: ®ister_handler("reinit", \&reinit_process_handler, 1, 0, 1);
1549:
1550: # Process the editing script for a table edit operation.
1551: # the editing operation must be encrypted and requested by
1552: # a manager host.
1553: #
1554: # Parameters:
1555: # $cmd - the actual keyword that invoked us.
1556: # $tail - the tail of the request that invoked us.
1557: # $client - File descriptor connected to the client
1558: # Returns:
1559: # 1 - Ok to continue processing.
1560: # 0 - Program should exit
1561: # Implicit output:
1562: # a reply is sent to the client.
1563: #
1564: sub edit_table_handler {
1565: my ($command, $tail, $client) = @_;
1566:
1567: my $userinput = "$command:$tail";
1568:
1569: my $cert = &GetCertificate($userinput);
1570: if(&ValidManager($cert)) {
1571: my($filetype, $script) = split(/:/, $tail);
1572: if (($filetype eq "hosts") ||
1573: ($filetype eq "domain")) {
1574: if($script ne "") {
1575: &Reply($client, # BUGBUG - EditFile
1576: &EditFile($userinput), # could fail.
1577: $userinput);
1578: } else {
1579: &Failure($client,"refused\n",$userinput);
1580: }
1581: } else {
1582: &Failure($client,"refused\n",$userinput);
1583: }
1584: } else {
1585: &Failure($client,"refused\n",$userinput);
1586: }
1587: return 1;
1588: }
1589: ®ister_handler("edit", \&edit_table_handler, 1, 0, 1);
1590:
1591: #
1592: # Authenticate a user against the LonCAPA authentication
1593: # database. Note that there are several authentication
1594: # possibilities:
1595: # - unix - The user can be authenticated against the unix
1596: # password file.
1597: # - internal - The user can be authenticated against a purely
1598: # internal per user password file.
1599: # - kerberos - The user can be authenticated against either a kerb4 or kerb5
1600: # ticket granting authority.
1601: # - user - The person tailoring LonCAPA can supply a user authentication
1602: # mechanism that is per system.
1603: #
1604: # Parameters:
1605: # $cmd - The command that got us here.
1606: # $tail - Tail of the command (remaining parameters).
1607: # $client - File descriptor connected to client.
1608: # Returns
1609: # 0 - Requested to exit, caller should shut down.
1610: # 1 - Continue processing.
1611: # Implicit inputs:
1612: # The authentication systems describe above have their own forms of implicit
1613: # input into the authentication process that are described above.
1614: #
1615: sub authenticate_handler {
1616: my ($cmd, $tail, $client) = @_;
1617:
1618:
1619: # Regenerate the full input line
1620:
1621: my $userinput = $cmd.":".$tail;
1622:
1623: # udom - User's domain.
1624: # uname - Username.
1625: # upass - User's password.
1626:
1627: my ($udom,$uname,$upass)=split(/:/,$tail);
1628: &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
1629: chomp($upass);
1630: $upass=&unescape($upass);
1631:
1632: my $pwdcorrect = &validate_user($udom, $uname, $upass);
1633: if($pwdcorrect) {
1634: &Reply( $client, "authorized\n", $userinput);
1635: #
1636: # Bad credentials: Failed to authorize
1637: #
1638: } else {
1639: &Failure( $client, "non_authorized\n", $userinput);
1640: }
1641:
1642: return 1;
1643: }
1644: ®ister_handler("auth", \&authenticate_handler, 1, 1, 0);
1645:
1646: #
1647: # Change a user's password. Note that this function is complicated by
1648: # the fact that a user may be authenticated in more than one way:
1649: # At present, we are not able to change the password for all types of
1650: # authentication methods. Only for:
1651: # unix - unix password or shadow passoword style authentication.
1652: # local - Locally written authentication mechanism.
1653: # For now, kerb4 and kerb5 password changes are not supported and result
1654: # in an error.
1655: # FUTURE WORK:
1656: # Support kerberos passwd changes?
1657: # Parameters:
1658: # $cmd - The command that got us here.
1659: # $tail - Tail of the command (remaining parameters).
1660: # $client - File descriptor connected to client.
1661: # Returns
1662: # 0 - Requested to exit, caller should shut down.
1663: # 1 - Continue processing.
1664: # Implicit inputs:
1665: # The authentication systems describe above have their own forms of implicit
1666: # input into the authentication process that are described above.
1667: sub change_password_handler {
1668: my ($cmd, $tail, $client) = @_;
1669:
1670: my $userinput = $cmd.":".$tail; # Reconstruct client's string.
1671:
1672: #
1673: # udom - user's domain.
1674: # uname - Username.
1675: # upass - Current password.
1676: # npass - New password.
1677:
1678: my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
1679:
1680: $upass=&unescape($upass);
1681: $npass=&unescape($npass);
1682: &Debug("Trying to change password for $uname");
1683:
1684: # First require that the user can be authenticated with their
1685: # old password:
1686:
1687: my $validated = &validate_user($udom, $uname, $upass);
1688: if($validated) {
1689: my $realpasswd = &get_auth_type($udom, $uname); # Defined since authd.
1690:
1691: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1692: if ($howpwd eq 'internal') {
1693: &Debug("internal auth");
1694: my $salt=time;
1695: $salt=substr($salt,6,2);
1696: my $ncpass=crypt($npass,$salt);
1697: if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
1698: &logthis("Result of password change for "
1699: ."$uname: pwchange_success");
1700: &Reply($client, "ok\n", $userinput);
1701: } else {
1702: &logthis("Unable to open $uname passwd "
1703: ."to change password");
1704: &Failure( $client, "non_authorized\n",$userinput);
1705: }
1706: } elsif ($howpwd eq 'unix') {
1707: my $result = &change_unix_password($uname, $npass);
1708: &logthis("Result of password change for $uname: ".
1709: $result);
1710: &Reply($client, "$result\n", $userinput);
1711: } else {
1712: # this just means that the current password mode is not
1713: # one we know how to change (e.g the kerberos auth modes or
1714: # locally written auth handler).
1715: #
1716: &Failure( $client, "auth_mode_error\n", $userinput);
1717: }
1718:
1719: } else {
1720: &Failure( $client, "non_authorized\n", $userinput);
1721: }
1722:
1723: return 1;
1724: }
1725: ®ister_handler("passwd", \&change_password_handler, 1, 1, 0);
1726:
1727: #
1728: # Create a new user. User in this case means a lon-capa user.
1729: # The user must either already exist in some authentication realm
1730: # like kerberos or the /etc/passwd. If not, a user completely local to
1731: # this loncapa system is created.
1732: #
1733: # Parameters:
1734: # $cmd - The command that got us here.
1735: # $tail - Tail of the command (remaining parameters).
1736: # $client - File descriptor connected to client.
1737: # Returns
1738: # 0 - Requested to exit, caller should shut down.
1739: # 1 - Continue processing.
1740: # Implicit inputs:
1741: # The authentication systems describe above have their own forms of implicit
1742: # input into the authentication process that are described above.
1743: sub add_user_handler {
1744:
1745: my ($cmd, $tail, $client) = @_;
1746:
1747:
1748: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1749: my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
1750:
1751: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
1752:
1753:
1754: if($udom eq $currentdomainid) { # Reject new users for other domains...
1755:
1756: my $oldumask=umask(0077);
1757: chomp($npass);
1758: $npass=&unescape($npass);
1759: my $passfilename = &password_path($udom, $uname);
1760: &Debug("Password file created will be:".$passfilename);
1761: if (-e $passfilename) {
1762: &Failure( $client, "already_exists\n", $userinput);
1763: } else {
1764: my $fperror='';
1765: if (!&mkpath($passfilename)) {
1766: $fperror="error: ".($!+0)." mkdir failed while attempting "
1767: ."makeuser";
1768: }
1769: unless ($fperror) {
1770: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
1771: &Reply($client, $result, $userinput); #BUGBUG - could be fail
1772: } else {
1773: &Failure($client, "$fperror\n", $userinput);
1774: }
1775: }
1776: umask($oldumask);
1777: } else {
1778: &Failure($client, "not_right_domain\n",
1779: $userinput); # Even if we are multihomed.
1780:
1781: }
1782: return 1;
1783:
1784: }
1785: ®ister_handler("makeuser", \&add_user_handler, 1, 1, 0);
1786:
1787: #
1788: # Change the authentication method of a user. Note that this may
1789: # also implicitly change the user's password if, for example, the user is
1790: # joining an existing authentication realm. Known authentication realms at
1791: # this time are:
1792: # internal - Purely internal password file (only loncapa knows this user)
1793: # local - Institutionally written authentication module.
1794: # unix - Unix user (/etc/passwd with or without /etc/shadow).
1795: # kerb4 - kerberos version 4
1796: # kerb5 - kerberos version 5
1797: #
1798: # Parameters:
1799: # $cmd - The command that got us here.
1800: # $tail - Tail of the command (remaining parameters).
1801: # $client - File descriptor connected to client.
1802: # Returns
1803: # 0 - Requested to exit, caller should shut down.
1804: # 1 - Continue processing.
1805: # Implicit inputs:
1806: # The authentication systems describe above have their own forms of implicit
1807: # input into the authentication process that are described above.
1808: # NOTE:
1809: # This is also used to change the authentication credential values (e.g. passwd).
1810: #
1811: #
1812: sub change_authentication_handler {
1813:
1814: my ($cmd, $tail, $client) = @_;
1815:
1816: my $userinput = "$cmd:$tail"; # Reconstruct user input.
1817:
1818: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1819: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
1820: if ($udom ne $currentdomainid) {
1821: &Failure( $client, "not_right_domain\n", $client);
1822: } else {
1823:
1824: chomp($npass);
1825:
1826: $npass=&unescape($npass);
1827: my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
1828: my $passfilename = &password_path($udom, $uname);
1829: if ($passfilename) { # Not allowed to create a new user!!
1830: # If just changing the unix passwd. need to arrange to run
1831: # passwd since otherwise make_passwd_file will run
1832: # lcuseradd which fails if an account already exists
1833: # (to prevent an unscrupulous LONCAPA admin from stealing
1834: # an existing account by overwriting it as a LonCAPA account).
1835:
1836: if(($oldauth =~/^unix/) && ($umode eq "unix")) {
1837: my $result = &change_unix_password($uname, $npass);
1838: &logthis("Result of password change for $uname: ".$result);
1839: if ($result eq "ok") {
1840: &Reply($client, "$result\n")
1841: } else {
1842: &Failure($client, "$result\n");
1843: }
1844: } else {
1845: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
1846: #
1847: # If the current auth mode is internal, and the old auth mode was
1848: # unix, or krb*, and the user is an author for this domain,
1849: # re-run manage_permissions for that role in order to be able
1850: # to take ownership of the construction space back to www:www
1851: #
1852:
1853:
1854: if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
1855: (($oldauth =~ /^internal/) && ($umode eq "unix")) ) {
1856: if(&is_author($udom, $uname)) {
1857: &Debug(" Need to manage author permissions...");
1858: &manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
1859: }
1860: }
1861: &Reply($client, $result, $userinput);
1862: }
1863:
1864:
1865: } else {
1866: &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
1867: }
1868: }
1869: return 1;
1870: }
1871: ®ister_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
1872:
1873: #
1874: # Determines if this is the home server for a user. The home server
1875: # for a user will have his/her lon-capa passwd file. Therefore all we need
1876: # to do is determine if this file exists.
1877: #
1878: # Parameters:
1879: # $cmd - The command that got us here.
1880: # $tail - Tail of the command (remaining parameters).
1881: # $client - File descriptor connected to client.
1882: # Returns
1883: # 0 - Requested to exit, caller should shut down.
1884: # 1 - Continue processing.
1885: # Implicit inputs:
1886: # The authentication systems describe above have their own forms of implicit
1887: # input into the authentication process that are described above.
1888: #
1889: sub is_home_handler {
1890: my ($cmd, $tail, $client) = @_;
1891:
1892: my $userinput = "$cmd:$tail";
1893:
1894: my ($udom,$uname)=split(/:/,$tail);
1895: chomp($uname);
1896: my $passfile = &password_filename($udom, $uname);
1897: if($passfile) {
1898: &Reply( $client, "found\n", $userinput);
1899: } else {
1900: &Failure($client, "not_found\n", $userinput);
1901: }
1902: return 1;
1903: }
1904: ®ister_handler("home", \&is_home_handler, 0,1,0);
1905:
1906: #
1907: # Process an update request for a resource?? I think what's going on here is
1908: # that a resource has been modified that we hold a subscription to.
1909: # If the resource is not local, then we must update, or at least invalidate our
1910: # cached copy of the resource.
1911: # FUTURE WORK:
1912: # I need to look at this logic carefully. My druthers would be to follow
1913: # typical caching logic, and simple invalidate the cache, drop any subscription
1914: # an let the next fetch start the ball rolling again... however that may
1915: # actually be more difficult than it looks given the complex web of
1916: # proxy servers.
1917: # Parameters:
1918: # $cmd - The command that got us here.
1919: # $tail - Tail of the command (remaining parameters).
1920: # $client - File descriptor connected to client.
1921: # Returns
1922: # 0 - Requested to exit, caller should shut down.
1923: # 1 - Continue processing.
1924: # Implicit inputs:
1925: # The authentication systems describe above have their own forms of implicit
1926: # input into the authentication process that are described above.
1927: #
1928: sub update_resource_handler {
1929:
1930: my ($cmd, $tail, $client) = @_;
1931:
1932: my $userinput = "$cmd:$tail";
1933:
1934: my $fname= $tail; # This allows interactive testing
1935:
1936:
1937: my $ownership=ishome($fname);
1938: if ($ownership eq 'not_owner') {
1939: if (-e $fname) {
1940: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
1941: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
1942: my $now=time;
1943: my $since=$now-$atime;
1944: if ($since>$perlvar{'lonExpire'}) {
1945: my $reply=&reply("unsub:$fname","$clientname");
1946: &devalidate_meta_cache($fname);
1947: unlink("$fname");
1948: } else {
1949: my $transname="$fname.in.transfer";
1950: my $remoteurl=&reply("sub:$fname","$clientname");
1951: my $response;
1952: alarm(120);
1953: {
1954: my $ua=new LWP::UserAgent;
1955: my $request=new HTTP::Request('GET',"$remoteurl");
1956: $response=$ua->request($request,$transname);
1957: }
1958: alarm(0);
1959: if ($response->is_error()) {
1960: unlink($transname);
1961: my $message=$response->status_line;
1962: &logthis("LWP GET: $message for $fname ($remoteurl)");
1963: } else {
1964: if ($remoteurl!~/\.meta$/) {
1965: alarm(120);
1966: {
1967: my $ua=new LWP::UserAgent;
1968: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
1969: my $mresponse=$ua->request($mrequest,$fname.'.meta');
1970: if ($mresponse->is_error()) {
1971: unlink($fname.'.meta');
1972: }
1973: }
1974: alarm(0);
1975: }
1976: rename($transname,$fname);
1977: &devalidate_meta_cache($fname);
1978: }
1979: }
1980: &Reply( $client, "ok\n", $userinput);
1981: } else {
1982: &Failure($client, "not_found\n", $userinput);
1983: }
1984: } else {
1985: &Failure($client, "rejected\n", $userinput);
1986: }
1987: return 1;
1988: }
1989: ®ister_handler("update", \&update_resource_handler, 0 ,1, 0);
1990:
1991: sub devalidate_meta_cache {
1992: my ($url) = @_;
1993: use Cache::Memcached;
1994: my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
1995: $url = &declutter($url);
1996: $url =~ s-\.meta$--;
1997: my $id = &escape('meta:'.$url);
1998: $memcache->delete($id);
1999: }
2000:
2001: sub declutter {
2002: my $thisfn=shift;
2003: $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
2004: $thisfn=~s/^\///;
2005: $thisfn=~s|^adm/wrapper/||;
2006: $thisfn=~s|^adm/coursedocs/showdoc/||;
2007: $thisfn=~s/^res\///;
2008: $thisfn=~s/\?.+$//;
2009: return $thisfn;
2010: }
2011: #
2012: # Fetch a user file from a remote server to the user's home directory
2013: # userfiles subdir.
2014: # Parameters:
2015: # $cmd - The command that got us here.
2016: # $tail - Tail of the command (remaining parameters).
2017: # $client - File descriptor connected to client.
2018: # Returns
2019: # 0 - Requested to exit, caller should shut down.
2020: # 1 - Continue processing.
2021: #
2022: sub fetch_user_file_handler {
2023:
2024: my ($cmd, $tail, $client) = @_;
2025:
2026: my $userinput = "$cmd:$tail";
2027: my $fname = $tail;
2028: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2029: my $udir=&propath($udom,$uname).'/userfiles';
2030: unless (-e $udir) {
2031: mkdir($udir,0770);
2032: }
2033: Debug("fetch user file for $fname");
2034: if (-e $udir) {
2035: $ufile=~s/^[\.\~]+//;
2036:
2037: # IF necessary, create the path right down to the file.
2038: # Note that any regular files in the way of this path are
2039: # wiped out to deal with some earlier folly of mine.
2040:
2041: if (!&mkpath($udir.'/'.$ufile)) {
2042: &Failure($client, "unable_to_create\n", $userinput);
2043: }
2044:
2045: my $destname=$udir.'/'.$ufile;
2046: my $transname=$udir.'/'.$ufile.'.in.transit';
2047: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
2048: my $response;
2049: Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
2050: alarm(120);
2051: {
2052: my $ua=new LWP::UserAgent;
2053: my $request=new HTTP::Request('GET',"$remoteurl");
2054: $response=$ua->request($request,$transname);
2055: }
2056: alarm(0);
2057: if ($response->is_error()) {
2058: unlink($transname);
2059: my $message=$response->status_line;
2060: &logthis("LWP GET: $message for $fname ($remoteurl)");
2061: &Failure($client, "failed\n", $userinput);
2062: } else {
2063: Debug("Renaming $transname to $destname");
2064: if (!rename($transname,$destname)) {
2065: &logthis("Unable to move $transname to $destname");
2066: unlink($transname);
2067: &Failure($client, "failed\n", $userinput);
2068: } else {
2069: &Reply($client, "ok\n", $userinput);
2070: }
2071: }
2072: } else {
2073: &Failure($client, "not_home\n", $userinput);
2074: }
2075: return 1;
2076: }
2077: ®ister_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
2078:
2079: #
2080: # Remove a file from a user's home directory userfiles subdirectory.
2081: # Parameters:
2082: # cmd - the Lond request keyword that got us here.
2083: # tail - the part of the command past the keyword.
2084: # client- File descriptor connected with the client.
2085: #
2086: # Returns:
2087: # 1 - Continue processing.
2088: sub remove_user_file_handler {
2089: my ($cmd, $tail, $client) = @_;
2090:
2091: my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2092:
2093: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2094: if ($ufile =~m|/\.\./|) {
2095: # any files paths with /../ in them refuse
2096: # to deal with
2097: &Failure($client, "refused\n", "$cmd:$tail");
2098: } else {
2099: my $udir = &propath($udom,$uname);
2100: if (-e $udir) {
2101: my $file=$udir.'/userfiles/'.$ufile;
2102: if (-e $file) {
2103: #
2104: # If the file is a regular file unlink is fine...
2105: # However it's possible the client wants a dir.
2106: # removed, in which case rmdir is more approprate:
2107: #
2108: if (-f $file){
2109: unlink($file);
2110: } elsif(-d $file) {
2111: rmdir($file);
2112: }
2113: if (-e $file) {
2114: # File is still there after we deleted it ?!?
2115:
2116: &Failure($client, "failed\n", "$cmd:$tail");
2117: } else {
2118: &Reply($client, "ok\n", "$cmd:$tail");
2119: }
2120: } else {
2121: &Failure($client, "not_found\n", "$cmd:$tail");
2122: }
2123: } else {
2124: &Failure($client, "not_home\n", "$cmd:$tail");
2125: }
2126: }
2127: return 1;
2128: }
2129: ®ister_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
2130:
2131: #
2132: # make a directory in a user's home directory userfiles subdirectory.
2133: # Parameters:
2134: # cmd - the Lond request keyword that got us here.
2135: # tail - the part of the command past the keyword.
2136: # client- File descriptor connected with the client.
2137: #
2138: # Returns:
2139: # 1 - Continue processing.
2140: sub mkdir_user_file_handler {
2141: my ($cmd, $tail, $client) = @_;
2142:
2143: my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2144: $dir=&unescape($dir);
2145: my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
2146: if ($ufile =~m|/\.\./|) {
2147: # any files paths with /../ in them refuse
2148: # to deal with
2149: &Failure($client, "refused\n", "$cmd:$tail");
2150: } else {
2151: my $udir = &propath($udom,$uname);
2152: if (-e $udir) {
2153: my $newdir=$udir.'/userfiles/'.$ufile.'/';
2154: if (!&mkpath($newdir)) {
2155: &Failure($client, "failed\n", "$cmd:$tail");
2156: }
2157: &Reply($client, "ok\n", "$cmd:$tail");
2158: } else {
2159: &Failure($client, "not_home\n", "$cmd:$tail");
2160: }
2161: }
2162: return 1;
2163: }
2164: ®ister_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
2165:
2166: #
2167: # rename a file in a user's home directory userfiles subdirectory.
2168: # Parameters:
2169: # cmd - the Lond request keyword that got us here.
2170: # tail - the part of the command past the keyword.
2171: # client- File descriptor connected with the client.
2172: #
2173: # Returns:
2174: # 1 - Continue processing.
2175: sub rename_user_file_handler {
2176: my ($cmd, $tail, $client) = @_;
2177:
2178: my ($udom,$uname,$old,$new) = split(/:/, $tail);
2179: $old=&unescape($old);
2180: $new=&unescape($new);
2181: if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
2182: # any files paths with /../ in them refuse to deal with
2183: &Failure($client, "refused\n", "$cmd:$tail");
2184: } else {
2185: my $udir = &propath($udom,$uname);
2186: if (-e $udir) {
2187: my $oldfile=$udir.'/userfiles/'.$old;
2188: my $newfile=$udir.'/userfiles/'.$new;
2189: if (-e $newfile) {
2190: &Failure($client, "exists\n", "$cmd:$tail");
2191: } elsif (! -e $oldfile) {
2192: &Failure($client, "not_found\n", "$cmd:$tail");
2193: } else {
2194: if (!rename($oldfile,$newfile)) {
2195: &Failure($client, "failed\n", "$cmd:$tail");
2196: } else {
2197: &Reply($client, "ok\n", "$cmd:$tail");
2198: }
2199: }
2200: } else {
2201: &Failure($client, "not_home\n", "$cmd:$tail");
2202: }
2203: }
2204: return 1;
2205: }
2206: ®ister_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
2207:
2208: #
2209: # Authenticate access to a user file by checking that the token the user's
2210: # passed also exists in their session file
2211: #
2212: # Parameters:
2213: # cmd - The request keyword that dispatched to tus.
2214: # tail - The tail of the request (colon separated parameters).
2215: # client - Filehandle open on the client.
2216: # Return:
2217: # 1.
2218: sub token_auth_user_file_handler {
2219: my ($cmd, $tail, $client) = @_;
2220:
2221: my ($fname, $session) = split(/:/, $tail);
2222:
2223: chomp($session);
2224: my $reply="non_auth\n";
2225: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
2226: $session.'.id')) {
2227: while (my $line=<ENVIN>) {
2228: if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply="ok\n"; }
2229: }
2230: close(ENVIN);
2231: &Reply($client, $reply, "$cmd:$tail");
2232: } else {
2233: &Failure($client, "invalid_token\n", "$cmd:$tail");
2234: }
2235: return 1;
2236:
2237: }
2238: ®ister_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
2239:
2240: #
2241: # Unsubscribe from a resource.
2242: #
2243: # Parameters:
2244: # $cmd - The command that got us here.
2245: # $tail - Tail of the command (remaining parameters).
2246: # $client - File descriptor connected to client.
2247: # Returns
2248: # 0 - Requested to exit, caller should shut down.
2249: # 1 - Continue processing.
2250: #
2251: sub unsubscribe_handler {
2252: my ($cmd, $tail, $client) = @_;
2253:
2254: my $userinput= "$cmd:$tail";
2255:
2256: my ($fname) = split(/:/,$tail); # Split in case there's extrs.
2257:
2258: &Debug("Unsubscribing $fname");
2259: if (-e $fname) {
2260: &Debug("Exists");
2261: &Reply($client, &unsub($fname,$clientip), $userinput);
2262: } else {
2263: &Failure($client, "not_found\n", $userinput);
2264: }
2265: return 1;
2266: }
2267: ®ister_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
2268:
2269: # Subscribe to a resource
2270: #
2271: # Parameters:
2272: # $cmd - The command that got us here.
2273: # $tail - Tail of the command (remaining parameters).
2274: # $client - File descriptor connected to client.
2275: # Returns
2276: # 0 - Requested to exit, caller should shut down.
2277: # 1 - Continue processing.
2278: #
2279: sub subscribe_handler {
2280: my ($cmd, $tail, $client)= @_;
2281:
2282: my $userinput = "$cmd:$tail";
2283:
2284: &Reply( $client, &subscribe($userinput,$clientip), $userinput);
2285:
2286: return 1;
2287: }
2288: ®ister_handler("sub", \&subscribe_handler, 0, 1, 0);
2289:
2290: #
2291: # Determine the version of a resource (?) Or is it return
2292: # the top version of the resource? Not yet clear from the
2293: # code in currentversion.
2294: #
2295: # Parameters:
2296: # $cmd - The command that got us here.
2297: # $tail - Tail of the command (remaining parameters).
2298: # $client - File descriptor connected to client.
2299: # Returns
2300: # 0 - Requested to exit, caller should shut down.
2301: # 1 - Continue processing.
2302: #
2303: sub current_version_handler {
2304: my ($cmd, $tail, $client) = @_;
2305:
2306: my $userinput= "$cmd:$tail";
2307:
2308: my $fname = $tail;
2309: &Reply( $client, ¤tversion($fname)."\n", $userinput);
2310: return 1;
2311:
2312: }
2313: ®ister_handler("currentversion", \¤t_version_handler, 0, 1, 0);
2314:
2315: # Make an entry in a user's activity log.
2316: #
2317: # Parameters:
2318: # $cmd - The command that got us here.
2319: # $tail - Tail of the command (remaining parameters).
2320: # $client - File descriptor connected to client.
2321: # Returns
2322: # 0 - Requested to exit, caller should shut down.
2323: # 1 - Continue processing.
2324: #
2325: sub activity_log_handler {
2326: my ($cmd, $tail, $client) = @_;
2327:
2328:
2329: my $userinput= "$cmd:$tail";
2330:
2331: my ($udom,$uname,$what)=split(/:/,$tail);
2332: chomp($what);
2333: my $proname=&propath($udom,$uname);
2334: my $now=time;
2335: my $hfh;
2336: if ($hfh=IO::File->new(">>$proname/activity.log")) {
2337: print $hfh "$now:$clientname:$what\n";
2338: &Reply( $client, "ok\n", $userinput);
2339: } else {
2340: &Failure($client, "error: ".($!+0)." IO::File->new Failed "
2341: ."while attempting log\n",
2342: $userinput);
2343: }
2344:
2345: return 1;
2346: }
2347: ®ister_handler("log", \&activity_log_handler, 0, 1, 0);
2348:
2349: #
2350: # Put a namespace entry in a user profile hash.
2351: # My druthers would be for this to be an encrypted interaction too.
2352: # anything that might be an inadvertent covert channel about either
2353: # user authentication or user personal information....
2354: #
2355: # Parameters:
2356: # $cmd - The command that got us here.
2357: # $tail - Tail of the command (remaining parameters).
2358: # $client - File descriptor connected to client.
2359: # Returns
2360: # 0 - Requested to exit, caller should shut down.
2361: # 1 - Continue processing.
2362: #
2363: sub put_user_profile_entry {
2364: my ($cmd, $tail, $client) = @_;
2365:
2366: my $userinput = "$cmd:$tail";
2367:
2368: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2369: if ($namespace ne 'roles') {
2370: chomp($what);
2371: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2372: &GDBM_WRCREAT(),"P",$what);
2373: if($hashref) {
2374: my @pairs=split(/\&/,$what);
2375: foreach my $pair (@pairs) {
2376: my ($key,$value)=split(/=/,$pair);
2377: $hashref->{$key}=$value;
2378: }
2379: if (untie(%$hashref)) {
2380: &Reply( $client, "ok\n", $userinput);
2381: } else {
2382: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2383: "while attempting put\n",
2384: $userinput);
2385: }
2386: } else {
2387: &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
2388: "while attempting put\n", $userinput);
2389: }
2390: } else {
2391: &Failure( $client, "refused\n", $userinput);
2392: }
2393:
2394: return 1;
2395: }
2396: ®ister_handler("put", \&put_user_profile_entry, 0, 1, 0);
2397:
2398: # Put a piece of new data in hash, returns error if entry already exists
2399: # Parameters:
2400: # $cmd - The command that got us here.
2401: # $tail - Tail of the command (remaining parameters).
2402: # $client - File descriptor connected to client.
2403: # Returns
2404: # 0 - Requested to exit, caller should shut down.
2405: # 1 - Continue processing.
2406: #
2407: sub newput_user_profile_entry {
2408: my ($cmd, $tail, $client) = @_;
2409:
2410: my $userinput = "$cmd:$tail";
2411:
2412: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2413: if ($namespace eq 'roles') {
2414: &Failure( $client, "refused\n", $userinput);
2415: return 1;
2416: }
2417:
2418: chomp($what);
2419:
2420: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2421: &GDBM_WRCREAT(),"N",$what);
2422: if(!$hashref) {
2423: &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
2424: "while attempting put\n", $userinput);
2425: return 1;
2426: }
2427:
2428: my @pairs=split(/\&/,$what);
2429: foreach my $pair (@pairs) {
2430: my ($key,$value)=split(/=/,$pair);
2431: if (exists($hashref->{$key})) {
2432: &Failure($client, "key_exists: ".$key."\n",$userinput);
2433: return 1;
2434: }
2435: }
2436:
2437: foreach my $pair (@pairs) {
2438: my ($key,$value)=split(/=/,$pair);
2439: $hashref->{$key}=$value;
2440: }
2441:
2442: if (untie(%$hashref)) {
2443: &Reply( $client, "ok\n", $userinput);
2444: } else {
2445: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2446: "while attempting put\n",
2447: $userinput);
2448: }
2449: return 1;
2450: }
2451: ®ister_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
2452:
2453: #
2454: # Increment a profile entry in the user history file.
2455: # The history contains keyword value pairs. In this case,
2456: # The value itself is a pair of numbers. The first, the current value
2457: # the second an increment that this function applies to the current
2458: # value.
2459: #
2460: # Parameters:
2461: # $cmd - The command that got us here.
2462: # $tail - Tail of the command (remaining parameters).
2463: # $client - File descriptor connected to client.
2464: # Returns
2465: # 0 - Requested to exit, caller should shut down.
2466: # 1 - Continue processing.
2467: #
2468: sub increment_user_value_handler {
2469: my ($cmd, $tail, $client) = @_;
2470:
2471: my $userinput = "$cmd:$tail";
2472:
2473: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
2474: if ($namespace ne 'roles') {
2475: chomp($what);
2476: my $hashref = &tie_user_hash($udom, $uname,
2477: $namespace, &GDBM_WRCREAT(),
2478: "P",$what);
2479: if ($hashref) {
2480: my @pairs=split(/\&/,$what);
2481: foreach my $pair (@pairs) {
2482: my ($key,$value)=split(/=/,$pair);
2483: $value = &unescape($value);
2484: # We could check that we have a number...
2485: if (! defined($value) || $value eq '') {
2486: $value = 1;
2487: }
2488: $hashref->{$key}+=$value;
2489: if ($namespace eq 'nohist_resourcetracker') {
2490: if ($hashref->{$key} < 0) {
2491: $hashref->{$key} = 0;
2492: }
2493: }
2494: }
2495: if (untie(%$hashref)) {
2496: &Reply( $client, "ok\n", $userinput);
2497: } else {
2498: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2499: "while attempting inc\n", $userinput);
2500: }
2501: } else {
2502: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2503: "while attempting inc\n", $userinput);
2504: }
2505: } else {
2506: &Failure($client, "refused\n", $userinput);
2507: }
2508:
2509: return 1;
2510: }
2511: ®ister_handler("inc", \&increment_user_value_handler, 0, 1, 0);
2512:
2513: #
2514: # Put a new role for a user. Roles are LonCAPA's packaging of permissions.
2515: # Each 'role' a user has implies a set of permissions. Adding a new role
2516: # for a person grants the permissions packaged with that role
2517: # to that user when the role is selected.
2518: #
2519: # Parameters:
2520: # $cmd - The command string (rolesput).
2521: # $tail - The remainder of the request line. For rolesput this
2522: # consists of a colon separated list that contains:
2523: # The domain and user that is granting the role (logged).
2524: # The domain and user that is getting the role.
2525: # The roles being granted as a set of & separated pairs.
2526: # each pair a key value pair.
2527: # $client - File descriptor connected to the client.
2528: # Returns:
2529: # 0 - If the daemon should exit
2530: # 1 - To continue processing.
2531: #
2532: #
2533: sub roles_put_handler {
2534: my ($cmd, $tail, $client) = @_;
2535:
2536: my $userinput = "$cmd:$tail";
2537:
2538: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail);
2539:
2540:
2541: my $namespace='roles';
2542: chomp($what);
2543: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2544: &GDBM_WRCREAT(), "P",
2545: "$exedom:$exeuser:$what");
2546: #
2547: # Log the attempt to set a role. The {}'s here ensure that the file
2548: # handle is open for the minimal amount of time. Since the flush
2549: # is done on close this improves the chances the log will be an un-
2550: # corrupted ordered thing.
2551: if ($hashref) {
2552: my $pass_entry = &get_auth_type($udom, $uname);
2553: my ($auth_type,$pwd) = split(/:/, $pass_entry);
2554: $auth_type = $auth_type.":";
2555: my @pairs=split(/\&/,$what);
2556: foreach my $pair (@pairs) {
2557: my ($key,$value)=split(/=/,$pair);
2558: &manage_permissions($key, $udom, $uname,
2559: $auth_type);
2560: $hashref->{$key}=$value;
2561: }
2562: if (untie($hashref)) {
2563: &Reply($client, "ok\n", $userinput);
2564: } else {
2565: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2566: "while attempting rolesput\n", $userinput);
2567: }
2568: } else {
2569: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2570: "while attempting rolesput\n", $userinput);
2571: }
2572: return 1;
2573: }
2574: ®ister_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only.
2575:
2576: #
2577: # Deletes (removes) a role for a user. This is equivalent to removing
2578: # a permissions package associated with the role from the user's profile.
2579: #
2580: # Parameters:
2581: # $cmd - The command (rolesdel)
2582: # $tail - The remainder of the request line. This consists
2583: # of:
2584: # The domain and user requesting the change (logged)
2585: # The domain and user being changed.
2586: # The roles being revoked. These are shipped to us
2587: # as a bunch of & separated role name keywords.
2588: # $client - The file handle open on the client.
2589: # Returns:
2590: # 1 - Continue processing
2591: # 0 - Exit.
2592: #
2593: sub roles_delete_handler {
2594: my ($cmd, $tail, $client) = @_;
2595:
2596: my $userinput = "$cmd:$tail";
2597:
2598: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
2599: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
2600: "what = ".$what);
2601: my $namespace='roles';
2602: chomp($what);
2603: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2604: &GDBM_WRCREAT(), "D",
2605: "$exedom:$exeuser:$what");
2606:
2607: if ($hashref) {
2608: my @rolekeys=split(/\&/,$what);
2609:
2610: foreach my $key (@rolekeys) {
2611: delete $hashref->{$key};
2612: }
2613: if (untie(%$hashref)) {
2614: &Reply($client, "ok\n", $userinput);
2615: } else {
2616: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2617: "while attempting rolesdel\n", $userinput);
2618: }
2619: } else {
2620: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2621: "while attempting rolesdel\n", $userinput);
2622: }
2623:
2624: return 1;
2625: }
2626: ®ister_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
2627:
2628: # Unencrypted get from a user's profile database. See
2629: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
2630: # This function retrieves a keyed item from a specific named database in the
2631: # user's directory.
2632: #
2633: # Parameters:
2634: # $cmd - Command request keyword (get).
2635: # $tail - Tail of the command. This is a colon separated list
2636: # consisting of the domain and username that uniquely
2637: # identifies the profile,
2638: # The 'namespace' which selects the gdbm file to
2639: # do the lookup in,
2640: # & separated list of keys to lookup. Note that
2641: # the values are returned as an & separated list too.
2642: # $client - File descriptor open on the client.
2643: # Returns:
2644: # 1 - Continue processing.
2645: # 0 - Exit.
2646: #
2647: sub get_profile_entry {
2648: my ($cmd, $tail, $client) = @_;
2649:
2650: my $userinput= "$cmd:$tail";
2651:
2652: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2653: chomp($what);
2654:
2655: my $replystring = read_profile($udom, $uname, $namespace, $what);
2656: my ($first) = split(/:/,$replystring);
2657: if($first ne "error") {
2658: &Reply($client, "$replystring\n", $userinput);
2659: } else {
2660: &Failure($client, $replystring." while attempting get\n", $userinput);
2661: }
2662: return 1;
2663:
2664:
2665: }
2666: ®ister_handler("get", \&get_profile_entry, 0,1,0);
2667:
2668: #
2669: # Process the encrypted get request. Note that the request is sent
2670: # in clear, but the reply is encrypted. This is a small covert channel:
2671: # information about the sensitive keys is given to the snooper. Just not
2672: # information about the values of the sensitive key. Hmm if I wanted to
2673: # know these I'd snoop for the egets. Get the profile item names from them
2674: # and then issue a get for them since there's no enforcement of the
2675: # requirement of an encrypted get for particular profile items. If I
2676: # were re-doing this, I'd force the request to be encrypted as well as the
2677: # reply. I'd also just enforce encrypted transactions for all gets since
2678: # that would prevent any covert channel snooping.
2679: #
2680: # Parameters:
2681: # $cmd - Command keyword of request (eget).
2682: # $tail - Tail of the command. See GetProfileEntry
# for more information about this.
2683: # $client - File open on the client.
2684: # Returns:
2685: # 1 - Continue processing
2686: # 0 - server should exit.
2687: sub get_profile_entry_encrypted {
2688: my ($cmd, $tail, $client) = @_;
2689:
2690: my $userinput = "$cmd:$tail";
2691:
2692: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
2693: chomp($what);
2694: my $qresult = read_profile($udom, $uname, $namespace, $what);
2695: my ($first) = split(/:/, $qresult);
2696: if($first ne "error") {
2697:
2698: if ($cipher) {
2699: my $cmdlength=length($qresult);
2700: $qresult.=" ";
2701: my $encqresult='';
2702: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2703: $encqresult.= unpack("H16",
2704: $cipher->encrypt(substr($qresult,
2705: $encidx,
2706: 8)));
2707: }
2708: &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
2709: } else {
2710: &Failure( $client, "error:no_key\n", $userinput);
2711: }
2712: } else {
2713: &Failure($client, "$qresult while attempting eget\n", $userinput);
2714:
2715: }
2716:
2717: return 1;
2718: }
2719: ®ister_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
2720:
2721: #
2722: # Deletes a key in a user profile database.
2723: #
2724: # Parameters:
2725: # $cmd - Command keyword (del).
2726: # $tail - Command tail. IN this case a colon
2727: # separated list containing:
2728: # The domain and user that identifies uniquely
2729: # the identity of the user.
2730: # The profile namespace (name of the profile
2731: # database file).
2732: # & separated list of keywords to delete.
2733: # $client - File open on client socket.
2734: # Returns:
2735: # 1 - Continue processing
2736: # 0 - Exit server.
2737: #
2738: #
2739: sub delete_profile_entry {
2740: my ($cmd, $tail, $client) = @_;
2741:
2742: my $userinput = "cmd:$tail";
2743:
2744: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2745: chomp($what);
2746: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2747: &GDBM_WRCREAT(),
2748: "D",$what);
2749: if ($hashref) {
2750: my @keys=split(/\&/,$what);
2751: foreach my $key (@keys) {
2752: delete($hashref->{$key});
2753: }
2754: if (untie(%$hashref)) {
2755: &Reply($client, "ok\n", $userinput);
2756: } else {
2757: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2758: "while attempting del\n", $userinput);
2759: }
2760: } else {
2761: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2762: "while attempting del\n", $userinput);
2763: }
2764: return 1;
2765: }
2766: ®ister_handler("del", \&delete_profile_entry, 0, 1, 0);
2767:
2768: #
2769: # List the set of keys that are defined in a profile database file.
2770: # A successful reply from this will contain an & separated list of
2771: # the keys.
2772: # Parameters:
2773: # $cmd - Command request (keys).
2774: # $tail - Remainder of the request, a colon separated
2775: # list containing domain/user that identifies the
2776: # user being queried, and the database namespace
2777: # (database filename essentially).
2778: # $client - File open on the client.
2779: # Returns:
2780: # 1 - Continue processing.
2781: # 0 - Exit the server.
2782: #
2783: sub get_profile_keys {
2784: my ($cmd, $tail, $client) = @_;
2785:
2786: my $userinput = "$cmd:$tail";
2787:
2788: my ($udom,$uname,$namespace)=split(/:/,$tail);
2789: my $qresult='';
2790: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2791: &GDBM_READER());
2792: if ($hashref) {
2793: foreach my $key (keys %$hashref) {
2794: $qresult.="$key&";
2795: }
2796: if (untie(%$hashref)) {
2797: $qresult=~s/\&$//;
2798: &Reply($client, "$qresult\n", $userinput);
2799: } else {
2800: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2801: "while attempting keys\n", $userinput);
2802: }
2803: } else {
2804: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2805: "while attempting keys\n", $userinput);
2806: }
2807:
2808: return 1;
2809: }
2810: ®ister_handler("keys", \&get_profile_keys, 0, 1, 0);
2811:
2812: #
2813: # Dump the contents of a user profile database.
2814: # Note that this constitutes a very large covert channel too since
2815: # the dump will return sensitive information that is not encrypted.
2816: # The naive security assumption is that the session negotiation ensures
2817: # our client is trusted and I don't believe that's assured at present.
2818: # Sure want badly to go to ssl or tls. Of course if my peer isn't really
2819: # a LonCAPA node they could have negotiated an encryption key too so >sigh<.
2820: #
2821: # Parameters:
2822: # $cmd - The command request keyword (currentdump).
2823: # $tail - Remainder of the request, consisting of a colon
2824: # separated list that has the domain/username and
2825: # the namespace to dump (database file).
2826: # $client - file open on the remote client.
2827: # Returns:
2828: # 1 - Continue processing.
2829: # 0 - Exit the server.
2830: #
2831: sub dump_profile_database {
2832: my ($cmd, $tail, $client) = @_;
2833:
2834: my $userinput = "$cmd:$tail";
2835:
2836: my ($udom,$uname,$namespace) = split(/:/,$tail);
2837: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2838: &GDBM_READER());
2839: if ($hashref) {
2840: # Structure of %data:
2841: # $data{$symb}->{$parameter}=$value;
2842: # $data{$symb}->{'v.'.$parameter}=$version;
2843: # since $parameter will be unescaped, we do not
2844: # have to worry about silly parameter names...
2845:
2846: my $qresult='';
2847: my %data = (); # A hash of anonymous hashes..
2848: while (my ($key,$value) = each(%$hashref)) {
2849: my ($v,$symb,$param) = split(/:/,$key);
2850: next if ($v eq 'version' || $symb eq 'keys');
2851: next if (exists($data{$symb}) &&
2852: exists($data{$symb}->{$param}) &&
2853: $data{$symb}->{'v.'.$param} > $v);
2854: $data{$symb}->{$param}=$value;
2855: $data{$symb}->{'v.'.$param}=$v;
2856: }
2857: if (untie(%$hashref)) {
2858: while (my ($symb,$param_hash) = each(%data)) {
2859: while(my ($param,$value) = each (%$param_hash)){
2860: next if ($param =~ /^v\./); # Ignore versions...
2861: #
2862: # Just dump the symb=value pairs separated by &
2863: #
2864: $qresult.=$symb.':'.$param.'='.$value.'&';
2865: }
2866: }
2867: chop($qresult);
2868: &Reply($client , "$qresult\n", $userinput);
2869: } else {
2870: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2871: "while attempting currentdump\n", $userinput);
2872: }
2873: } else {
2874: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2875: "while attempting currentdump\n", $userinput);
2876: }
2877:
2878: return 1;
2879: }
2880: ®ister_handler("currentdump", \&dump_profile_database, 0, 1, 0);
2881:
2882: #
2883: # Dump a profile database with an optional regular expression
2884: # to match against the keys. In this dump, no effort is made
2885: # to separate symb from version information. Presumably the
2886: # databases that are dumped by this command are of a different
2887: # structure. Need to look at this and improve the documentation of
2888: # both this and the currentdump handler.
2889: # Parameters:
2890: # $cmd - The command keyword.
2891: # $tail - All of the characters after the $cmd:
2892: # These are expected to be a colon
2893: # separated list containing:
2894: # domain/user - identifying the user.
2895: # namespace - identifying the database.
2896: # regexp - optional regular expression
2897: # that is matched against
2898: # database keywords to do
2899: # selective dumps.
2900: # $client - Channel open on the client.
2901: # Returns:
2902: # 1 - Continue processing.
2903: # Side effects:
2904: # response is written to $client.
2905: #
2906: sub dump_with_regexp {
2907: my ($cmd, $tail, $client) = @_;
2908:
2909:
2910: my $userinput = "$cmd:$tail";
2911:
2912: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
2913: if (defined($regexp)) {
2914: $regexp=&unescape($regexp);
2915: } else {
2916: $regexp='.';
2917: }
2918: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2919: &GDBM_READER());
2920: if ($hashref) {
2921: my $qresult='';
2922: while (my ($key,$value) = each(%$hashref)) {
2923: if ($regexp eq '.') {
2924: $qresult.=$key.'='.$value.'&';
2925: } else {
2926: my $unescapeKey = &unescape($key);
2927: if (eval('$unescapeKey=~/$regexp/')) {
2928: $qresult.="$key=$value&";
2929: }
2930: }
2931: }
2932: if (untie(%$hashref)) {
2933: chop($qresult);
2934: &Reply($client, "$qresult\n", $userinput);
2935: } else {
2936: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2937: "while attempting dump\n", $userinput);
2938: }
2939: } else {
2940: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2941: "while attempting dump\n", $userinput);
2942: }
2943:
2944: return 1;
2945: }
2946: ®ister_handler("dump", \&dump_with_regexp, 0, 1, 0);
2947:
2948: # Store a set of key=value pairs associated with a versioned name.
2949: #
2950: # Parameters:
2951: # $cmd - Request command keyword.
2952: # $tail - Tail of the request. This is a colon
2953: # separated list containing:
2954: # domain/user - User and authentication domain.
2955: # namespace - Name of the database being modified
2956: # rid - Resource keyword to modify.
2957: # what - new value associated with rid.
2958: #
2959: # $client - Socket open on the client.
2960: #
2961: #
2962: # Returns:
2963: # 1 (keep on processing).
2964: # Side-Effects:
2965: # Writes to the client
2966: sub store_handler {
2967: my ($cmd, $tail, $client) = @_;
2968:
2969: my $userinput = "$cmd:$tail";
2970:
2971: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
2972: if ($namespace ne 'roles') {
2973:
2974: chomp($what);
2975: my @pairs=split(/\&/,$what);
2976: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2977: &GDBM_WRCREAT(), "S",
2978: "$rid:$what");
2979: if ($hashref) {
2980: my $now = time;
2981: my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
2982: my $key;
2983: $hashref->{"version:$rid"}++;
2984: my $version=$hashref->{"version:$rid"};
2985: my $allkeys='';
2986: foreach my $pair (@pairs) {
2987: my ($key,$value)=split(/=/,$pair);
2988: $allkeys.=$key.':';
2989: $hashref->{"$version:$rid:$key"}=$value;
2990: }
2991: $hashref->{"$version:$rid:timestamp"}=$now;
2992: $allkeys.='timestamp';
2993: $hashref->{"$version:keys:$rid"}=$allkeys;
2994: if (untie($hashref)) {
2995: &Reply($client, "ok\n", $userinput);
2996: } else {
2997: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2998: "while attempting store\n", $userinput);
2999: }
3000: } else {
3001: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3002: "while attempting store\n", $userinput);
3003: }
3004: } else {
3005: &Failure($client, "refused\n", $userinput);
3006: }
3007:
3008: return 1;
3009: }
3010: ®ister_handler("store", \&store_handler, 0, 1, 0);
3011:
3012: #
3013: # Dump out all versions of a resource that has key=value pairs associated
3014: # with it for each version. These resources are built up via the store
3015: # command.
3016: #
3017: # Parameters:
3018: # $cmd - Command keyword.
3019: # $tail - Remainder of the request which consists of:
3020: # domain/user - User and auth. domain.
3021: # namespace - name of resource database.
3022: # rid - Resource id.
3023: # $client - socket open on the client.
3024: #
3025: # Returns:
3026: # 1 indicating the caller should not yet exit.
3027: # Side-effects:
3028: # Writes a reply to the client.
3029: # The reply is a string of the following shape:
3030: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
3031: # Where the 1 above represents version 1.
3032: # this continues for all pairs of keys in all versions.
3033: #
3034: #
3035: #
3036: #
3037: sub restore_handler {
3038: my ($cmd, $tail, $client) = @_;
3039:
3040: my $userinput = "$cmd:$tail"; # Only used for logging purposes.
3041:
3042: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
3043: $namespace=~s/\//\_/g;
3044: $namespace=~s/\W//g;
3045: chomp($rid);
3046: my $proname=&propath($udom,$uname);
3047: my $qresult='';
3048: my %hash;
3049: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
3050: &GDBM_READER(),0640)) {
3051: my $version=$hash{"version:$rid"};
3052: $qresult.="version=$version&";
3053: my $scope;
3054: for ($scope=1;$scope<=$version;$scope++) {
3055: my $vkeys=$hash{"$scope:keys:$rid"};
3056: my @keys=split(/:/,$vkeys);
3057: my $key;
3058: $qresult.="$scope:keys=$vkeys&";
3059: foreach $key (@keys) {
3060: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
3061: }
3062: }
3063: if (untie(%hash)) {
3064: $qresult=~s/\&$//;
3065: &Reply( $client, "$qresult\n", $userinput);
3066: } else {
3067: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3068: "while attempting restore\n", $userinput);
3069: }
3070: } else {
3071: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3072: "while attempting restore\n", $userinput);
3073: }
3074:
3075: return 1;
3076:
3077:
3078: }
3079: ®ister_handler("restore", \&restore_handler, 0,1,0);
3080:
3081: #
3082: # Add a chat message to to a discussion board.
3083: #
3084: # Parameters:
3085: # $cmd - Request keyword.
3086: # $tail - Tail of the command. A colon separated list
3087: # containing:
3088: # cdom - Domain on which the chat board lives
3089: # cnum - Identifier of the discussion group.
3090: # post - Body of the posting.
3091: # $client - Socket open on the client.
3092: # Returns:
3093: # 1 - Indicating caller should keep on processing.
3094: #
3095: # Side-effects:
3096: # writes a reply to the client.
3097: #
3098: #
3099: sub send_chat_handler {
3100: my ($cmd, $tail, $client) = @_;
3101:
3102:
3103: my $userinput = "$cmd:$tail";
3104:
3105: my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
3106: &chat_add($cdom,$cnum,$newpost);
3107: &Reply($client, "ok\n", $userinput);
3108:
3109: return 1;
3110: }
3111: ®ister_handler("chatsend", \&send_chat_handler, 0, 1, 0);
3112:
3113: #
3114: # Retrieve the set of chat messagss from a discussion board.
3115: #
3116: # Parameters:
3117: # $cmd - Command keyword that initiated the request.
3118: # $tail - Remainder of the request after the command
3119: # keyword. In this case a colon separated list of
3120: # chat domain - Which discussion board.
3121: # chat id - Discussion thread(?)
3122: # domain/user - Authentication domain and username
3123: # of the requesting person.
3124: # $client - Socket open on the client program.
3125: # Returns:
3126: # 1 - continue processing
3127: # Side effects:
3128: # Response is written to the client.
3129: #
3130: sub retrieve_chat_handler {
3131: my ($cmd, $tail, $client) = @_;
3132:
3133:
3134: my $userinput = "$cmd:$tail";
3135:
3136: my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
3137: my $reply='';
3138: foreach (&get_chat($cdom,$cnum,$udom,$uname)) {
3139: $reply.=&escape($_).':';
3140: }
3141: $reply=~s/\:$//;
3142: &Reply($client, $reply."\n", $userinput);
3143:
3144:
3145: return 1;
3146: }
3147: ®ister_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
3148:
3149: #
3150: # Initiate a query of an sql database. SQL query repsonses get put in
3151: # a file for later retrieval. This prevents sql query results from
3152: # bottlenecking the system. Note that with loncnew, perhaps this is
3153: # less of an issue since multiple outstanding requests can be concurrently
3154: # serviced.
3155: #
3156: # Parameters:
3157: # $cmd - COmmand keyword that initiated the request.
3158: # $tail - Remainder of the command after the keyword.
3159: # For this function, this consists of a query and
3160: # 3 arguments that are self-documentingly labelled
3161: # in the original arg1, arg2, arg3.
3162: # $client - Socket open on the client.
3163: # Return:
3164: # 1 - Indicating processing should continue.
3165: # Side-effects:
3166: # a reply is written to $client.
3167: #
3168: sub send_query_handler {
3169: my ($cmd, $tail, $client) = @_;
3170:
3171:
3172: my $userinput = "$cmd:$tail";
3173:
3174: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
3175: $query=~s/\n*$//g;
3176: &Reply($client, "". &sql_reply("$clientname\&$query".
3177: "\&$arg1"."\&$arg2"."\&$arg3")."\n",
3178: $userinput);
3179:
3180: return 1;
3181: }
3182: ®ister_handler("querysend", \&send_query_handler, 0, 1, 0);
3183:
3184: #
3185: # Add a reply to an sql query. SQL queries are done asyncrhonously.
3186: # The query is submitted via a "querysend" transaction.
3187: # There it is passed on to the lonsql daemon, queued and issued to
3188: # mysql.
3189: # This transaction is invoked when the sql transaction is complete
3190: # it stores the query results in flie and indicates query completion.
3191: # presumably local software then fetches this response... I'm guessing
3192: # the sequence is: lonc does a querysend, we ask lonsql to do it.
3193: # lonsql on completion of the query interacts with the lond of our
3194: # client to do a query reply storing two files:
3195: # - id - The results of the query.
3196: # - id.end - Indicating the transaction completed.
3197: # NOTE: id is a unique id assigned to the query and querysend time.
3198: # Parameters:
3199: # $cmd - Command keyword that initiated this request.
3200: # $tail - Remainder of the tail. In this case that's a colon
3201: # separated list containing the query Id and the
3202: # results of the query.
3203: # $client - Socket open on the client.
3204: # Return:
3205: # 1 - Indicating that we should continue processing.
3206: # Side effects:
3207: # ok written to the client.
3208: #
3209: sub reply_query_handler {
3210: my ($cmd, $tail, $client) = @_;
3211:
3212:
3213: my $userinput = "$cmd:$tail";
3214:
3215: my ($cmd,$id,$reply)=split(/:/,$userinput);
3216: my $store;
3217: my $execdir=$perlvar{'lonDaemons'};
3218: if ($store=IO::File->new(">$execdir/tmp/$id")) {
3219: $reply=~s/\&/\n/g;
3220: print $store $reply;
3221: close $store;
3222: my $store2=IO::File->new(">$execdir/tmp/$id.end");
3223: print $store2 "done\n";
3224: close $store2;
3225: &Reply($client, "ok\n", $userinput);
3226: } else {
3227: &Failure($client, "error: ".($!+0)
3228: ." IO::File->new Failed ".
3229: "while attempting queryreply\n", $userinput);
3230: }
3231:
3232:
3233: return 1;
3234: }
3235: ®ister_handler("queryreply", \&reply_query_handler, 0, 1, 0);
3236:
3237: #
3238: # Process the courseidput request. Not quite sure what this means
3239: # at the system level sense. It appears a gdbm file in the
3240: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and
3241: # a set of entries made in that database.
3242: #
3243: # Parameters:
3244: # $cmd - The command keyword that initiated this request.
3245: # $tail - Tail of the command. In this case consists of a colon
3246: # separated list contaning the domain to apply this to and
3247: # an ampersand separated list of keyword=value pairs.
3248: # Each value is a colon separated list that includes:
3249: # description, institutional code and course owner.
3250: # For backward compatibility with versions included
3251: # in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
3252: # code and/or course owner are preserved from the existing
3253: # record when writing a new record in response to 1.1 or
3254: # 1.2 implementations of lonnet::flushcourselogs().
3255: #
3256: # $client - Socket open on the client.
3257: # Returns:
3258: # 1 - indicating that processing should continue
3259: #
3260: # Side effects:
3261: # reply is written to the client.
3262: #
3263: sub put_course_id_handler {
3264: my ($cmd, $tail, $client) = @_;
3265:
3266:
3267: my $userinput = "$cmd:$tail";
3268:
3269: my ($udom, $what) = split(/:/, $tail,2);
3270: chomp($what);
3271: my $now=time;
3272: my @pairs=split(/\&/,$what);
3273:
3274: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3275: if ($hashref) {
3276: foreach my $pair (@pairs) {
3277: my ($key,$courseinfo) = split(/=/,$pair,2);
3278: $courseinfo =~ s/=/:/g;
3279:
3280: my @current_items = split(/:/,$hashref->{$key});
3281: shift(@current_items); # remove description
3282: pop(@current_items); # remove last access
3283: my $numcurrent = scalar(@current_items);
3284:
3285: my @new_items = split(/:/,$courseinfo);
3286: my $numnew = scalar(@new_items);
3287: if ($numcurrent > 0) {
3288: if ($numnew == 1) { # flushcourselogs() from 1.1 or earlier
3289: $courseinfo .= ':'.join(':',@current_items);
3290: } elsif ($numnew == 2) { # flushcourselogs() from 1.2.X
3291: $courseinfo .= ':'.$current_items[$numcurrent-1];
3292: }
3293: }
3294: $hashref->{$key}=$courseinfo.':'.$now;
3295: }
3296: if (untie(%$hashref)) {
3297: &Reply( $client, "ok\n", $userinput);
3298: } else {
3299: &Failure($client, "error: ".($!+0)
3300: ." untie(GDBM) Failed ".
3301: "while attempting courseidput\n", $userinput);
3302: }
3303: } else {
3304: &Failure($client, "error: ".($!+0)
3305: ." tie(GDBM) Failed ".
3306: "while attempting courseidput\n", $userinput);
3307: }
3308:
3309:
3310: return 1;
3311: }
3312: ®ister_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
3313:
3314: # Retrieves the value of a course id resource keyword pattern
3315: # defined since a starting date. Both the starting date and the
3316: # keyword pattern are optional. If the starting date is not supplied it
3317: # is treated as the beginning of time. If the pattern is not found,
3318: # it is treatred as "." matching everything.
3319: #
3320: # Parameters:
3321: # $cmd - Command keyword that resulted in us being dispatched.
3322: # $tail - The remainder of the command that, in this case, consists
3323: # of a colon separated list of:
3324: # domain - The domain in which the course database is
3325: # defined.
3326: # since - Optional parameter describing the minimum
3327: # time of definition(?) of the resources that
3328: # will match the dump.
3329: # description - regular expression that is used to filter
3330: # the dump. Only keywords matching this regexp
3331: # will be used.
3332: # institutional code - optional supplied code to filter
3333: # the dump. Only courses with an institutional code
3334: # that match the supplied code will be returned.
3335: # owner - optional supplied username of owner to filter
3336: # the dump. Only courses for which the course
3337: # owner matches the supplied username will be
3338: # returned. Implicit assumption that owner
3339: # is a user in the domain in which the
3340: # course database is defined.
3341: # $client - The socket open on the client.
3342: # Returns:
3343: # 1 - Continue processing.
3344: # Side Effects:
3345: # a reply is written to $client.
3346: sub dump_course_id_handler {
3347: my ($cmd, $tail, $client) = @_;
3348:
3349: my $userinput = "$cmd:$tail";
3350:
3351: my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter) =split(/:/,$tail);
3352: if (defined($description)) {
3353: $description=&unescape($description);
3354: } else {
3355: $description='.';
3356: }
3357: if (defined($instcodefilter)) {
3358: $instcodefilter=&unescape($instcodefilter);
3359: } else {
3360: $instcodefilter='.';
3361: }
3362: if (defined($ownerfilter)) {
3363: $ownerfilter=&unescape($ownerfilter);
3364: } else {
3365: $ownerfilter='.';
3366: }
3367: if (defined($coursefilter)) {
3368: $coursefilter=&unescape($coursefilter);
3369: } else {
3370: $coursefilter='.';
3371: }
3372:
3373: unless (defined($since)) { $since=0; }
3374: my $qresult='';
3375: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3376: if ($hashref) {
3377: while (my ($key,$value) = each(%$hashref)) {
3378: my ($descr,$lasttime,$inst_code,$owner);
3379: my @courseitems = split(/:/,$value);
3380: $lasttime = pop(@courseitems);
3381: ($descr,$inst_code,$owner)=@courseitems;
3382: if ($lasttime<$since) { next; }
3383: my $match = 1;
3384: unless ($description eq '.') {
3385: my $unescapeDescr = &unescape($descr);
3386: unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
3387: $match = 0;
3388: }
3389: }
3390: unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
3391: my $unescapeInstcode = &unescape($inst_code);
3392: unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
3393: $match = 0;
3394: }
3395: }
3396: unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
3397: my $unescapeOwner = &unescape($owner);
3398: unless (eval('$unescapeOwner=~/\Q$ownerfilter\E/i')) {
3399: $match = 0;
3400: }
3401: }
3402: unless ($coursefilter eq '.' || !defined($coursefilter)) {
3403: my $unescapeCourse = &unescape($key);
3404: unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
3405: $match = 0;
3406: }
3407: }
3408: if ($match == 1) {
3409: $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
3410: }
3411: }
3412: if (untie(%$hashref)) {
3413: chop($qresult);
3414: &Reply($client, "$qresult\n", $userinput);
3415: } else {
3416: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3417: "while attempting courseiddump\n", $userinput);
3418: }
3419: } else {
3420: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3421: "while attempting courseiddump\n", $userinput);
3422: }
3423:
3424:
3425: return 1;
3426: }
3427: ®ister_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
3428:
3429: #
3430: # Puts an id to a domains id database.
3431: #
3432: # Parameters:
3433: # $cmd - The command that triggered us.
3434: # $tail - Remainder of the request other than the command. This is a
3435: # colon separated list containing:
3436: # $domain - The domain for which we are writing the id.
3437: # $pairs - The id info to write... this is and & separated list
3438: # of keyword=value.
3439: # $client - Socket open on the client.
3440: # Returns:
3441: # 1 - Continue processing.
3442: # Side effects:
3443: # reply is written to $client.
3444: #
3445: sub put_id_handler {
3446: my ($cmd,$tail,$client) = @_;
3447:
3448:
3449: my $userinput = "$cmd:$tail";
3450:
3451: my ($udom,$what)=split(/:/,$tail);
3452: chomp($what);
3453: my @pairs=split(/\&/,$what);
3454: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
3455: "P", $what);
3456: if ($hashref) {
3457: foreach my $pair (@pairs) {
3458: my ($key,$value)=split(/=/,$pair);
3459: $hashref->{$key}=$value;
3460: }
3461: if (untie(%$hashref)) {
3462: &Reply($client, "ok\n", $userinput);
3463: } else {
3464: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3465: "while attempting idput\n", $userinput);
3466: }
3467: } else {
3468: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3469: "while attempting idput\n", $userinput);
3470: }
3471:
3472: return 1;
3473: }
3474: ®ister_handler("idput", \&put_id_handler, 0, 1, 0);
3475:
3476: #
3477: # Retrieves a set of id values from the id database.
3478: # Returns an & separated list of results, one for each requested id to the
3479: # client.
3480: #
3481: # Parameters:
3482: # $cmd - Command keyword that caused us to be dispatched.
3483: # $tail - Tail of the command. Consists of a colon separated:
3484: # domain - the domain whose id table we dump
3485: # ids Consists of an & separated list of
3486: # id keywords whose values will be fetched.
3487: # nonexisting keywords will have an empty value.
3488: # $client - Socket open on the client.
3489: #
3490: # Returns:
3491: # 1 - indicating processing should continue.
3492: # Side effects:
3493: # An & separated list of results is written to $client.
3494: #
3495: sub get_id_handler {
3496: my ($cmd, $tail, $client) = @_;
3497:
3498:
3499: my $userinput = "$client:$tail";
3500:
3501: my ($udom,$what)=split(/:/,$tail);
3502: chomp($what);
3503: my @queries=split(/\&/,$what);
3504: my $qresult='';
3505: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
3506: if ($hashref) {
3507: for (my $i=0;$i<=$#queries;$i++) {
3508: $qresult.="$hashref->{$queries[$i]}&";
3509: }
3510: if (untie(%$hashref)) {
3511: $qresult=~s/\&$//;
3512: &Reply($client, "$qresult\n", $userinput);
3513: } else {
3514: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
3515: "while attempting idget\n",$userinput);
3516: }
3517: } else {
3518: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3519: "while attempting idget\n",$userinput);
3520: }
3521:
3522: return 1;
3523: }
3524: ®ister_handler("idget", \&get_id_handler, 0, 1, 0);
3525:
3526: #
3527: # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database
3528: #
3529: # Parameters
3530: # $cmd - Command keyword that caused us to be dispatched.
3531: # $tail - Tail of the command. Consists of a colon separated:
3532: # domain - the domain whose dcmail we are recording
3533: # email Consists of key=value pair
3534: # where key is unique msgid
3535: # and value is message (in XML)
3536: # $client - Socket open on the client.
3537: #
3538: # Returns:
3539: # 1 - indicating processing should continue.
3540: # Side effects
3541: # reply is written to $client.
3542: #
3543: sub put_dcmail_handler {
3544: my ($cmd,$tail,$client) = @_;
3545: my $userinput = "$cmd:$tail";
3546:
3547: my ($udom,$what)=split(/:/,$tail);
3548: chomp($what);
3549: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
3550: if ($hashref) {
3551: my ($key,$value)=split(/=/,$what);
3552: $hashref->{$key}=$value;
3553: }
3554: if (untie(%$hashref)) {
3555: &Reply($client, "ok\n", $userinput);
3556: } else {
3557: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3558: "while attempting dcmailput\n", $userinput);
3559: }
3560: return 1;
3561: }
3562: ®ister_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
3563:
3564: #
3565: # Retrieves broadcast e-mail from nohist_dcmail database
3566: # Returns to client an & separated list of key=value pairs,
3567: # where key is msgid and value is message information.
3568: #
3569: # Parameters
3570: # $cmd - Command keyword that caused us to be dispatched.
3571: # $tail - Tail of the command. Consists of a colon separated:
3572: # domain - the domain whose dcmail table we dump
3573: # startfilter - beginning of time window
3574: # endfilter - end of time window
3575: # sendersfilter - & separated list of username:domain
3576: # for senders to search for.
3577: # $client - Socket open on the client.
3578: #
3579: # Returns:
3580: # 1 - indicating processing should continue.
3581: # Side effects
3582: # reply (& separated list of msgid=messageinfo pairs) is
3583: # written to $client.
3584: #
3585: sub dump_dcmail_handler {
3586: my ($cmd, $tail, $client) = @_;
3587:
3588: my $userinput = "$cmd:$tail";
3589: my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
3590: chomp($sendersfilter);
3591: my @senders = ();
3592: if (defined($startfilter)) {
3593: $startfilter=&unescape($startfilter);
3594: } else {
3595: $startfilter='.';
3596: }
3597: if (defined($endfilter)) {
3598: $endfilter=&unescape($endfilter);
3599: } else {
3600: $endfilter='.';
3601: }
3602: if (defined($sendersfilter)) {
3603: $sendersfilter=&unescape($sendersfilter);
3604: @senders = map { &unescape($_) } split(/\&/,$sendersfilter);
3605: }
3606:
3607: my $qresult='';
3608: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
3609: if ($hashref) {
3610: while (my ($key,$value) = each(%$hashref)) {
3611: my $match = 1;
3612: my ($timestamp,$subj,$uname,$udom) =
3613: split(/:/,&unescape(&unescape($key)),5); # yes, twice really
3614: $subj = &unescape($subj);
3615: unless ($startfilter eq '.' || !defined($startfilter)) {
3616: if ($timestamp < $startfilter) {
3617: $match = 0;
3618: }
3619: }
3620: unless ($endfilter eq '.' || !defined($endfilter)) {
3621: if ($timestamp > $endfilter) {
3622: $match = 0;
3623: }
3624: }
3625: unless (@senders < 1) {
3626: unless (grep/^$uname:$udom$/,@senders) {
3627: $match = 0;
3628: }
3629: }
3630: if ($match == 1) {
3631: $qresult.=$key.'='.$value.'&';
3632: }
3633: }
3634: if (untie(%$hashref)) {
3635: chop($qresult);
3636: &Reply($client, "$qresult\n", $userinput);
3637: } else {
3638: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3639: "while attempting dcmaildump\n", $userinput);
3640: }
3641: } else {
3642: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3643: "while attempting dcmaildump\n", $userinput);
3644: }
3645: return 1;
3646: }
3647:
3648: ®ister_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
3649:
3650: #
3651: # Puts domain roles in nohist_domainroles database
3652: #
3653: # Parameters
3654: # $cmd - Command keyword that caused us to be dispatched.
3655: # $tail - Tail of the command. Consists of a colon separated:
3656: # domain - the domain whose roles we are recording
3657: # role - Consists of key=value pair
3658: # where key is unique role
3659: # and value is start/end date information
3660: # $client - Socket open on the client.
3661: #
3662: # Returns:
3663: # 1 - indicating processing should continue.
3664: # Side effects
3665: # reply is written to $client.
3666: #
3667:
3668: sub put_domainroles_handler {
3669: my ($cmd,$tail,$client) = @_;
3670:
3671: my $userinput = "$cmd:$tail";
3672: my ($udom,$what)=split(/:/,$tail);
3673: chomp($what);
3674: my @pairs=split(/\&/,$what);
3675: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
3676: if ($hashref) {
3677: foreach my $pair (@pairs) {
3678: my ($key,$value)=split(/=/,$pair);
3679: $hashref->{$key}=$value;
3680: }
3681: if (untie(%$hashref)) {
3682: &Reply($client, "ok\n", $userinput);
3683: } else {
3684: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3685: "while attempting domroleput\n", $userinput);
3686: }
3687: } else {
3688: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3689: "while attempting domroleput\n", $userinput);
3690: }
3691:
3692: return 1;
3693: }
3694:
3695: ®ister_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
3696:
3697: #
3698: # Retrieves domain roles from nohist_domainroles database
3699: # Returns to client an & separated list of key=value pairs,
3700: # where key is role and value is start and end date information.
3701: #
3702: # Parameters
3703: # $cmd - Command keyword that caused us to be dispatched.
3704: # $tail - Tail of the command. Consists of a colon separated:
3705: # domain - the domain whose domain roles table we dump
3706: # $client - Socket open on the client.
3707: #
3708: # Returns:
3709: # 1 - indicating processing should continue.
3710: # Side effects
3711: # reply (& separated list of role=start/end info pairs) is
3712: # written to $client.
3713: #
3714: sub dump_domainroles_handler {
3715: my ($cmd, $tail, $client) = @_;
3716:
3717: my $userinput = "$cmd:$tail";
3718: my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
3719: chomp($rolesfilter);
3720: my @roles = ();
3721: if (defined($startfilter)) {
3722: $startfilter=&unescape($startfilter);
3723: } else {
3724: $startfilter='.';
3725: }
3726: if (defined($endfilter)) {
3727: $endfilter=&unescape($endfilter);
3728: } else {
3729: $endfilter='.';
3730: }
3731: if (defined($rolesfilter)) {
3732: $rolesfilter=&unescape($rolesfilter);
3733: @roles = split(/\&/,$rolesfilter);
3734: }
3735:
3736: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
3737: if ($hashref) {
3738: my $qresult = '';
3739: while (my ($key,$value) = each(%$hashref)) {
3740: my $match = 1;
3741: my ($start,$end) = split(/:/,&unescape($value));
3742: my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
3743: unless ($startfilter eq '.' || !defined($startfilter)) {
3744: if ($start >= $startfilter) {
3745: $match = 0;
3746: }
3747: }
3748: unless ($endfilter eq '.' || !defined($endfilter)) {
3749: if ($end <= $endfilter) {
3750: $match = 0;
3751: }
3752: }
3753: unless (@roles < 1) {
3754: unless (grep/^$trole$/,@roles) {
3755: $match = 0;
3756: }
3757: }
3758: if ($match == 1) {
3759: $qresult.=$key.'='.$value.'&';
3760: }
3761: }
3762: if (untie(%$hashref)) {
3763: chop($qresult);
3764: &Reply($client, "$qresult\n", $userinput);
3765: } else {
3766: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3767: "while attempting domrolesdump\n", $userinput);
3768: }
3769: } else {
3770: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3771: "while attempting domrolesdump\n", $userinput);
3772: }
3773: return 1;
3774: }
3775:
3776: ®ister_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
3777:
3778:
3779: # Process the tmpput command I'm not sure what this does.. Seems to
3780: # create a file in the lonDaemons/tmp directory of the form $id.tmp
3781: # where Id is the client's ip concatenated with a sequence number.
3782: # The file will contain some value that is passed in. Is this e.g.
3783: # a login token?
3784: #
3785: # Parameters:
3786: # $cmd - The command that got us dispatched.
3787: # $tail - The remainder of the request following $cmd:
3788: # In this case this will be the contents of the file.
3789: # $client - Socket connected to the client.
3790: # Returns:
3791: # 1 indicating processing can continue.
3792: # Side effects:
3793: # A file is created in the local filesystem.
3794: # A reply is sent to the client.
3795: sub tmp_put_handler {
3796: my ($cmd, $what, $client) = @_;
3797:
3798: my $userinput = "$cmd:$what"; # Reconstruct for logging.
3799:
3800:
3801: my $store;
3802: $tmpsnum++;
3803: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
3804: $id=~s/\W/\_/g;
3805: $what=~s/\n//g;
3806: my $execdir=$perlvar{'lonDaemons'};
3807: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
3808: print $store $what;
3809: close $store;
3810: &Reply($client, "$id\n", $userinput);
3811: } else {
3812: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3813: "while attempting tmpput\n", $userinput);
3814: }
3815: return 1;
3816:
3817: }
3818: ®ister_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
3819:
3820: # Processes the tmpget command. This command returns the contents
3821: # of a temporary resource file(?) created via tmpput.
3822: #
3823: # Paramters:
3824: # $cmd - Command that got us dispatched.
3825: # $id - Tail of the command, contain the id of the resource
3826: # we want to fetch.
3827: # $client - socket open on the client.
3828: # Return:
3829: # 1 - Inidcating processing can continue.
3830: # Side effects:
3831: # A reply is sent to the client.
3832: #
3833: sub tmp_get_handler {
3834: my ($cmd, $id, $client) = @_;
3835:
3836: my $userinput = "$cmd:$id";
3837:
3838:
3839: $id=~s/\W/\_/g;
3840: my $store;
3841: my $execdir=$perlvar{'lonDaemons'};
3842: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
3843: my $reply=<$store>;
3844: &Reply( $client, "$reply\n", $userinput);
3845: close $store;
3846: } else {
3847: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3848: "while attempting tmpget\n", $userinput);
3849: }
3850:
3851: return 1;
3852: }
3853: ®ister_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
3854:
3855: #
3856: # Process the tmpdel command. This command deletes a temp resource
3857: # created by the tmpput command.
3858: #
3859: # Parameters:
3860: # $cmd - Command that got us here.
3861: # $id - Id of the temporary resource created.
3862: # $client - socket open on the client process.
3863: #
3864: # Returns:
3865: # 1 - Indicating processing should continue.
3866: # Side Effects:
3867: # A file is deleted
3868: # A reply is sent to the client.
3869: sub tmp_del_handler {
3870: my ($cmd, $id, $client) = @_;
3871:
3872: my $userinput= "$cmd:$id";
3873:
3874: chomp($id);
3875: $id=~s/\W/\_/g;
3876: my $execdir=$perlvar{'lonDaemons'};
3877: if (unlink("$execdir/tmp/$id.tmp")) {
3878: &Reply($client, "ok\n", $userinput);
3879: } else {
3880: &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
3881: "while attempting tmpdel\n", $userinput);
3882: }
3883:
3884: return 1;
3885:
3886: }
3887: ®ister_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
3888:
3889: #
3890: # Processes the setannounce command. This command
3891: # creates a file named announce.txt in the top directory of
3892: # the documentn root and sets its contents. The announce.txt file is
3893: # printed in its entirety at the LonCAPA login page. Note:
3894: # once the announcement.txt fileis created it cannot be deleted.
3895: # However, setting the contents of the file to empty removes the
3896: # announcement from the login page of loncapa so who cares.
3897: #
3898: # Parameters:
3899: # $cmd - The command that got us dispatched.
3900: # $announcement - The text of the announcement.
3901: # $client - Socket open on the client process.
3902: # Retunrns:
3903: # 1 - Indicating request processing should continue
3904: # Side Effects:
3905: # The file {DocRoot}/announcement.txt is created.
3906: # A reply is sent to $client.
3907: #
3908: sub set_announce_handler {
3909: my ($cmd, $announcement, $client) = @_;
3910:
3911: my $userinput = "$cmd:$announcement";
3912:
3913: chomp($announcement);
3914: $announcement=&unescape($announcement);
3915: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
3916: '/announcement.txt')) {
3917: print $store $announcement;
3918: close $store;
3919: &Reply($client, "ok\n", $userinput);
3920: } else {
3921: &Failure($client, "error: ".($!+0)."\n", $userinput);
3922: }
3923:
3924: return 1;
3925: }
3926: ®ister_handler("setannounce", \&set_announce_handler, 0, 1, 0);
3927:
3928: #
3929: # Return the version of the daemon. This can be used to determine
3930: # the compatibility of cross version installations or, alternatively to
3931: # simply know who's out of date and who isn't. Note that the version
3932: # is returned concatenated with the tail.
3933: # Parameters:
3934: # $cmd - the request that dispatched to us.
3935: # $tail - Tail of the request (client's version?).
3936: # $client - Socket open on the client.
3937: #Returns:
3938: # 1 - continue processing requests.
3939: # Side Effects:
3940: # Replies with version to $client.
3941: sub get_version_handler {
3942: my ($cmd, $tail, $client) = @_;
3943:
3944: my $userinput = $cmd.$tail;
3945:
3946: &Reply($client, &version($userinput)."\n", $userinput);
3947:
3948:
3949: return 1;
3950: }
3951: ®ister_handler("version", \&get_version_handler, 0, 1, 0);
3952:
3953: # Set the current host and domain. This is used to support
3954: # multihomed systems. Each IP of the system, or even separate daemons
3955: # on the same IP can be treated as handling a separate lonCAPA virtual
3956: # machine. This command selects the virtual lonCAPA. The client always
3957: # knows the right one since it is lonc and it is selecting the domain/system
3958: # from the hosts.tab file.
3959: # Parameters:
3960: # $cmd - Command that dispatched us.
3961: # $tail - Tail of the command (domain/host requested).
3962: # $socket - Socket open on the client.
3963: #
3964: # Returns:
3965: # 1 - Indicates the program should continue to process requests.
3966: # Side-effects:
3967: # The default domain/system context is modified for this daemon.
3968: # a reply is sent to the client.
3969: #
3970: sub set_virtual_host_handler {
3971: my ($cmd, $tail, $socket) = @_;
3972:
3973: my $userinput ="$cmd:$tail";
3974:
3975: &Reply($client, &sethost($userinput)."\n", $userinput);
3976:
3977:
3978: return 1;
3979: }
3980: ®ister_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
3981:
3982: # Process a request to exit:
3983: # - "bye" is sent to the client.
3984: # - The client socket is shutdown and closed.
3985: # - We indicate to the caller that we should exit.
3986: # Formal Parameters:
3987: # $cmd - The command that got us here.
3988: # $tail - Tail of the command (empty).
3989: # $client - Socket open on the tail.
3990: # Returns:
3991: # 0 - Indicating the program should exit!!
3992: #
3993: sub exit_handler {
3994: my ($cmd, $tail, $client) = @_;
3995:
3996: my $userinput = "$cmd:$tail";
3997:
3998: &logthis("Client $clientip ($clientname) hanging up: $userinput");
3999: &Reply($client, "bye\n", $userinput);
4000: $client->shutdown(2); # shutdown the socket forcibly.
4001: $client->close();
4002:
4003: return 0;
4004: }
4005: ®ister_handler("exit", \&exit_handler, 0,1,1);
4006: ®ister_handler("init", \&exit_handler, 0,1,1);
4007: ®ister_handler("quit", \&exit_handler, 0,1,1);
4008:
4009: # Determine if auto-enrollment is enabled.
4010: # Note that the original had what I believe to be a defect.
4011: # The original returned 0 if the requestor was not a registerd client.
4012: # It should return "refused".
4013: # Formal Parameters:
4014: # $cmd - The command that invoked us.
4015: # $tail - The tail of the command (Extra command parameters.
4016: # $client - The socket open on the client that issued the request.
4017: # Returns:
4018: # 1 - Indicating processing should continue.
4019: #
4020: sub enrollment_enabled_handler {
4021: my ($cmd, $tail, $client) = @_;
4022: my $userinput = $cmd.":".$tail; # For logging purposes.
4023:
4024:
4025: my $cdom = split(/:/, $tail); # Domain we're asking about.
4026: my $outcome = &localenroll::run($cdom);
4027: &Reply($client, "$outcome\n", $userinput);
4028:
4029: return 1;
4030: }
4031: ®ister_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
4032:
4033: # Get the official sections for which auto-enrollment is possible.
4034: # Since the admin people won't know about 'unofficial sections'
4035: # we cannot auto-enroll on them.
4036: # Formal Parameters:
4037: # $cmd - The command request that got us dispatched here.
4038: # $tail - The remainder of the request. In our case this
4039: # will be split into:
4040: # $coursecode - The course name from the admin point of view.
4041: # $cdom - The course's domain(?).
4042: # $client - Socket open on the client.
4043: # Returns:
4044: # 1 - Indiciting processing should continue.
4045: #
4046: sub get_sections_handler {
4047: my ($cmd, $tail, $client) = @_;
4048: my $userinput = "$cmd:$tail";
4049:
4050: my ($coursecode, $cdom) = split(/:/, $tail);
4051: my @secs = &localenroll::get_sections($coursecode,$cdom);
4052: my $seclist = &escape(join(':',@secs));
4053:
4054: &Reply($client, "$seclist\n", $userinput);
4055:
4056:
4057: return 1;
4058: }
4059: ®ister_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
4060:
4061: # Validate the owner of a new course section.
4062: #
4063: # Formal Parameters:
4064: # $cmd - Command that got us dispatched.
4065: # $tail - the remainder of the command. For us this consists of a
4066: # colon separated string containing:
4067: # $inst - Course Id from the institutions point of view.
4068: # $owner - Proposed owner of the course.
4069: # $cdom - Domain of the course (from the institutions
4070: # point of view?)..
4071: # $client - Socket open on the client.
4072: #
4073: # Returns:
4074: # 1 - Processing should continue.
4075: #
4076: sub validate_course_owner_handler {
4077: my ($cmd, $tail, $client) = @_;
4078: my $userinput = "$cmd:$tail";
4079: my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
4080:
4081: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
4082: &Reply($client, "$outcome\n", $userinput);
4083:
4084:
4085:
4086: return 1;
4087: }
4088: ®ister_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
4089:
4090: #
4091: # Validate a course section in the official schedule of classes
4092: # from the institutions point of view (part of autoenrollment).
4093: #
4094: # Formal Parameters:
4095: # $cmd - The command request that got us dispatched.
4096: # $tail - The tail of the command. In this case,
4097: # this is a colon separated set of words that will be split
4098: # into:
4099: # $inst_course_id - The course/section id from the
4100: # institutions point of view.
4101: # $cdom - The domain from the institutions
4102: # point of view.
4103: # $client - Socket open on the client.
4104: # Returns:
4105: # 1 - Indicating processing should continue.
4106: #
4107: sub validate_course_section_handler {
4108: my ($cmd, $tail, $client) = @_;
4109: my $userinput = "$cmd:$tail";
4110: my ($inst_course_id, $cdom) = split(/:/, $tail);
4111:
4112: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
4113: &Reply($client, "$outcome\n", $userinput);
4114:
4115:
4116: return 1;
4117: }
4118: ®ister_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
4119:
4120: #
4121: # Create a password for a new auto-enrollment user.
4122: # I think/guess, this password allows access to the institutions
4123: # AIS class list server/services. Stuart can correct this comment
4124: # when he finds out how wrong I am.
4125: #
4126: # Formal Parameters:
4127: # $cmd - The command request that got us dispatched.
4128: # $tail - The tail of the command. In this case this is a colon separated
4129: # set of words that will be split into:
4130: # $authparam - An authentication parameter (username??).
4131: # $cdom - The domain of the course from the institution's
4132: # point of view.
4133: # $client - The socket open on the client.
4134: # Returns:
4135: # 1 - continue processing.
4136: #
4137: sub create_auto_enroll_password_handler {
4138: my ($cmd, $tail, $client) = @_;
4139: my $userinput = "$cmd:$tail";
4140:
4141: my ($authparam, $cdom) = split(/:/, $userinput);
4142:
4143: my ($create_passwd,$authchk);
4144: ($authparam,
4145: $create_passwd,
4146: $authchk) = &localenroll::create_password($authparam,$cdom);
4147:
4148: &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
4149: $userinput);
4150:
4151:
4152: return 1;
4153: }
4154: ®ister_handler("autocreatepassword", \&create_auto_enroll_password_handler,
4155: 0, 1, 0);
4156:
4157: # Retrieve and remove temporary files created by/during autoenrollment.
4158: #
4159: # Formal Parameters:
4160: # $cmd - The command that got us dispatched.
4161: # $tail - The tail of the command. In our case this is a colon
4162: # separated list that will be split into:
4163: # $filename - The name of the file to remove.
4164: # The filename is given as a path relative to
4165: # the LonCAPA temp file directory.
4166: # $client - Socket open on the client.
4167: #
4168: # Returns:
4169: # 1 - Continue processing.
4170: sub retrieve_auto_file_handler {
4171: my ($cmd, $tail, $client) = @_;
4172: my $userinput = "cmd:$tail";
4173:
4174: my ($filename) = split(/:/, $tail);
4175:
4176: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
4177: if ( (-e $source) && ($filename ne '') ) {
4178: my $reply = '';
4179: if (open(my $fh,$source)) {
4180: while (<$fh>) {
4181: chomp($_);
4182: $_ =~ s/^\s+//g;
4183: $_ =~ s/\s+$//g;
4184: $reply .= $_;
4185: }
4186: close($fh);
4187: &Reply($client, &escape($reply)."\n", $userinput);
4188:
4189: # Does this have to be uncommented??!? (RF).
4190: #
4191: # unlink($source);
4192: } else {
4193: &Failure($client, "error\n", $userinput);
4194: }
4195: } else {
4196: &Failure($client, "error\n", $userinput);
4197: }
4198:
4199:
4200: return 1;
4201: }
4202: ®ister_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
4203:
4204: #
4205: # Read and retrieve institutional code format (for support form).
4206: # Formal Parameters:
4207: # $cmd - Command that dispatched us.
4208: # $tail - Tail of the command. In this case it conatins
4209: # the course domain and the coursename.
4210: # $client - Socket open on the client.
4211: # Returns:
4212: # 1 - Continue processing.
4213: #
4214: sub get_institutional_code_format_handler {
4215: my ($cmd, $tail, $client) = @_;
4216: my $userinput = "$cmd:$tail";
4217:
4218: my $reply;
4219: my($cdom,$course) = split(/:/,$tail);
4220: my @pairs = split/\&/,$course;
4221: my %instcodes = ();
4222: my %codes = ();
4223: my @codetitles = ();
4224: my %cat_titles = ();
4225: my %cat_order = ();
4226: foreach (@pairs) {
4227: my ($key,$value) = split/=/,$_;
4228: $instcodes{&unescape($key)} = &unescape($value);
4229: }
4230: my $formatreply = &localenroll::instcode_format($cdom,
4231: \%instcodes,
4232: \%codes,
4233: \@codetitles,
4234: \%cat_titles,
4235: \%cat_order);
4236: if ($formatreply eq 'ok') {
4237: my $codes_str = &hash2str(%codes);
4238: my $codetitles_str = &array2str(@codetitles);
4239: my $cat_titles_str = &hash2str(%cat_titles);
4240: my $cat_order_str = &hash2str(%cat_order);
4241: &Reply($client,
4242: $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
4243: .$cat_order_str."\n",
4244: $userinput);
4245: } else {
4246: # this else branch added by RF since if not ok, lonc will
4247: # hang waiting on reply until timeout.
4248: #
4249: &Reply($client, "format_error\n", $userinput);
4250: }
4251:
4252: return 1;
4253: }
4254: ®ister_handler("autoinstcodeformat",
4255: \&get_institutional_code_format_handler,0,1,0);
4256:
4257: #
4258: # Gets a student's photo to exist (in the correct image type) in the user's
4259: # directory.
4260: # Formal Parameters:
4261: # $cmd - The command request that got us dispatched.
4262: # $tail - A colon separated set of words that will be split into:
4263: # $domain - student's domain
4264: # $uname - student username
4265: # $type - image type desired
4266: # $client - The socket open on the client.
4267: # Returns:
4268: # 1 - continue processing.
4269: sub student_photo_handler {
4270: my ($cmd, $tail, $client) = @_;
4271: my ($domain,$uname,$type) = split(/:/, $tail);
4272:
4273: my $path=&propath($domain,$uname).
4274: '/userfiles/internal/studentphoto.'.$type;
4275: if (-e $path) {
4276: &Reply($client,"ok\n","$cmd:$tail");
4277: return 1;
4278: }
4279: &mkpath($path);
4280: my $file=&localstudentphoto::fetch($domain,$uname);
4281: if (!$file) {
4282: &Failure($client,"unavailable\n","$cmd:$tail");
4283: return 1;
4284: }
4285: if (!-e $path) { &convert_photo($file,$path); }
4286: if (-e $path) {
4287: &Reply($client,"ok\n","$cmd:$tail");
4288: return 1;
4289: }
4290: &Failure($client,"unable_to_convert\n","$cmd:$tail");
4291: return 1;
4292: }
4293: ®ister_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
4294:
4295: # mkpath makes all directories for a file, expects an absolute path with a
4296: # file or a trailing / if just a dir is passed
4297: # returns 1 on success 0 on failure
4298: sub mkpath {
4299: my ($file)=@_;
4300: my @parts=split(/\//,$file,-1);
4301: my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
4302: for (my $i=3;$i<= ($#parts-1);$i++) {
4303: $now.='/'.$parts[$i];
4304: if (!-e $now) {
4305: if (!mkdir($now,0770)) { return 0; }
4306: }
4307: }
4308: return 1;
4309: }
4310:
4311: #---------------------------------------------------------------
4312: #
4313: # Getting, decoding and dispatching requests:
4314: #
4315: #
4316: # Get a Request:
4317: # Gets a Request message from the client. The transaction
4318: # is defined as a 'line' of text. We remove the new line
4319: # from the text line.
4320: #
4321: sub get_request {
4322: my $input = <$client>;
4323: chomp($input);
4324:
4325: &Debug("get_request: Request = $input\n");
4326:
4327: &status('Processing '.$clientname.':'.$input);
4328:
4329: return $input;
4330: }
4331: #---------------------------------------------------------------
4332: #
4333: # Process a request. This sub should shrink as each action
4334: # gets farmed out into a separat sub that is registered
4335: # with the dispatch hash.
4336: #
4337: # Parameters:
4338: # user_input - The request received from the client (lonc).
4339: # Returns:
4340: # true to keep processing, false if caller should exit.
4341: #
4342: sub process_request {
4343: my ($userinput) = @_; # Easier for now to break style than to
4344: # fix all the userinput -> user_input.
4345: my $wasenc = 0; # True if request was encrypted.
4346: # ------------------------------------------------------------ See if encrypted
4347: if ($userinput =~ /^enc/) {
4348: $userinput = decipher($userinput);
4349: $wasenc=1;
4350: if(!$userinput) { # Cipher not defined.
4351: &Failure($client, "error: Encrypted data without negotated key\n");
4352: return 0;
4353: }
4354: }
4355: Debug("process_request: $userinput\n");
4356:
4357: #
4358: # The 'correct way' to add a command to lond is now to
4359: # write a sub to execute it and Add it to the command dispatch
4360: # hash via a call to register_handler.. The comments to that
4361: # sub should give you enough to go on to show how to do this
4362: # along with the examples that are building up as this code
4363: # is getting refactored. Until all branches of the
4364: # if/elseif monster below have been factored out into
4365: # separate procesor subs, if the dispatch hash is missing
4366: # the command keyword, we will fall through to the remainder
4367: # of the if/else chain below in order to keep this thing in
4368: # working order throughout the transmogrification.
4369:
4370: my ($command, $tail) = split(/:/, $userinput, 2);
4371: chomp($command);
4372: chomp($tail);
4373: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
4374: $command =~ s/(\r)//; # And this too for parameterless commands.
4375: if(!$tail) {
4376: $tail =""; # defined but blank.
4377: }
4378:
4379: &Debug("Command received: $command, encoded = $wasenc");
4380:
4381: if(defined $Dispatcher{$command}) {
4382:
4383: my $dispatch_info = $Dispatcher{$command};
4384: my $handler = $$dispatch_info[0];
4385: my $need_encode = $$dispatch_info[1];
4386: my $client_types = $$dispatch_info[2];
4387: Debug("Matched dispatch hash: mustencode: $need_encode "
4388: ."ClientType $client_types");
4389:
4390: # Validate the request:
4391:
4392: my $ok = 1;
4393: my $requesterprivs = 0;
4394: if(&isClient()) {
4395: $requesterprivs |= $CLIENT_OK;
4396: }
4397: if(&isManager()) {
4398: $requesterprivs |= $MANAGER_OK;
4399: }
4400: if($need_encode && (!$wasenc)) {
4401: Debug("Must encode but wasn't: $need_encode $wasenc");
4402: $ok = 0;
4403: }
4404: if(($client_types & $requesterprivs) == 0) {
4405: Debug("Client not privileged to do this operation");
4406: $ok = 0;
4407: }
4408:
4409: if($ok) {
4410: Debug("Dispatching to handler $command $tail");
4411: my $keep_going = &$handler($command, $tail, $client);
4412: return $keep_going;
4413: } else {
4414: Debug("Refusing to dispatch because client did not match requirements");
4415: Failure($client, "refused\n", $userinput);
4416: return 1;
4417: }
4418:
4419: }
4420:
4421: print $client "unknown_cmd\n";
4422: # -------------------------------------------------------------------- complete
4423: Debug("process_request - returning 1");
4424: return 1;
4425: }
4426: #
4427: # Decipher encoded traffic
4428: # Parameters:
4429: # input - Encoded data.
4430: # Returns:
4431: # Decoded data or undef if encryption key was not yet negotiated.
4432: # Implicit input:
4433: # cipher - This global holds the negotiated encryption key.
4434: #
4435: sub decipher {
4436: my ($input) = @_;
4437: my $output = '';
4438:
4439:
4440: if($cipher) {
4441: my($enc, $enclength, $encinput) = split(/:/, $input);
4442: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
4443: $output .=
4444: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
4445: }
4446: return substr($output, 0, $enclength);
4447: } else {
4448: return undef;
4449: }
4450: }
4451:
4452: #
4453: # Register a command processor. This function is invoked to register a sub
4454: # to process a request. Once registered, the ProcessRequest sub can automatically
4455: # dispatch requests to an appropriate sub, and do the top level validity checking
4456: # as well:
4457: # - Is the keyword recognized.
4458: # - Is the proper client type attempting the request.
4459: # - Is the request encrypted if it has to be.
4460: # Parameters:
4461: # $request_name - Name of the request being registered.
4462: # This is the command request that will match
4463: # against the hash keywords to lookup the information
4464: # associated with the dispatch information.
4465: # $procedure - Reference to a sub to call to process the request.
4466: # All subs get called as follows:
4467: # Procedure($cmd, $tail, $replyfd, $key)
4468: # $cmd - the actual keyword that invoked us.
4469: # $tail - the tail of the request that invoked us.
4470: # $replyfd- File descriptor connected to the client
4471: # $must_encode - True if the request must be encoded to be good.
4472: # $client_ok - True if it's ok for a client to request this.
4473: # $manager_ok - True if it's ok for a manager to request this.
4474: # Side effects:
4475: # - On success, the Dispatcher hash has an entry added for the key $RequestName
4476: # - On failure, the program will die as it's a bad internal bug to try to
4477: # register a duplicate command handler.
4478: #
4479: sub register_handler {
4480: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
4481:
4482: # Don't allow duplication#
4483:
4484: if (defined $Dispatcher{$request_name}) {
4485: die "Attempting to define a duplicate request handler for $request_name\n";
4486: }
4487: # Build the client type mask:
4488:
4489: my $client_type_mask = 0;
4490: if($client_ok) {
4491: $client_type_mask |= $CLIENT_OK;
4492: }
4493: if($manager_ok) {
4494: $client_type_mask |= $MANAGER_OK;
4495: }
4496:
4497: # Enter the hash:
4498:
4499: my @entry = ($procedure, $must_encode, $client_type_mask);
4500:
4501: $Dispatcher{$request_name} = \@entry;
4502:
4503: }
4504:
4505:
4506: #------------------------------------------------------------------
4507:
4508:
4509:
4510:
4511: #
4512: # Convert an error return code from lcpasswd to a string value.
4513: #
4514: sub lcpasswdstrerror {
4515: my $ErrorCode = shift;
4516: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
4517: return "lcpasswd Unrecognized error return value ".$ErrorCode;
4518: } else {
4519: return $passwderrors[$ErrorCode];
4520: }
4521: }
4522:
4523: #
4524: # Convert an error return code from lcuseradd to a string value:
4525: #
4526: sub lcuseraddstrerror {
4527: my $ErrorCode = shift;
4528: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
4529: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
4530: } else {
4531: return $adderrors[$ErrorCode];
4532: }
4533: }
4534:
4535: # grabs exception and records it to log before exiting
4536: sub catchexception {
4537: my ($error)=@_;
4538: $SIG{'QUIT'}='DEFAULT';
4539: $SIG{__DIE__}='DEFAULT';
4540: &status("Catching exception");
4541: &logthis("<font color='red'>CRITICAL: "
4542: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
4543: ."a crash with this error msg->[$error]</font>");
4544: &logthis('Famous last words: '.$status.' - '.$lastlog);
4545: if ($client) { print $client "error: $error\n"; }
4546: $server->close();
4547: die($error);
4548: }
4549: sub timeout {
4550: &status("Handling Timeout");
4551: &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
4552: &catchexception('Timeout');
4553: }
4554: # -------------------------------- Set signal handlers to record abnormal exits
4555:
4556:
4557: $SIG{'QUIT'}=\&catchexception;
4558: $SIG{__DIE__}=\&catchexception;
4559:
4560: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
4561: &status("Read loncapa.conf and loncapa_apache.conf");
4562: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
4563: %perlvar=%{$perlvarref};
4564: undef $perlvarref;
4565:
4566: # ----------------------------- Make sure this process is running from user=www
4567: my $wwwid=getpwnam('www');
4568: if ($wwwid!=$<) {
4569: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4570: my $subj="LON: $currenthostid User ID mismatch";
4571: system("echo 'User ID mismatch. lond must be run as user www.' |\
4572: mailto $emailto -s '$subj' > /dev/null");
4573: exit 1;
4574: }
4575:
4576: # --------------------------------------------- Check if other instance running
4577:
4578: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
4579:
4580: if (-e $pidfile) {
4581: my $lfh=IO::File->new("$pidfile");
4582: my $pide=<$lfh>;
4583: chomp($pide);
4584: if (kill 0 => $pide) { die "already running"; }
4585: }
4586:
4587: # ------------------------------------------------------------- Read hosts file
4588:
4589:
4590:
4591: # establish SERVER socket, bind and listen.
4592: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
4593: Type => SOCK_STREAM,
4594: Proto => 'tcp',
4595: Reuse => 1,
4596: Listen => 10 )
4597: or die "making socket: $@\n";
4598:
4599: # --------------------------------------------------------- Do global variables
4600:
4601: # global variables
4602:
4603: my %children = (); # keys are current child process IDs
4604:
4605: sub REAPER { # takes care of dead children
4606: $SIG{CHLD} = \&REAPER;
4607: &status("Handling child death");
4608: my $pid;
4609: do {
4610: $pid = waitpid(-1,&WNOHANG());
4611: if (defined($children{$pid})) {
4612: &logthis("Child $pid died");
4613: delete($children{$pid});
4614: } elsif ($pid > 0) {
4615: &logthis("Unknown Child $pid died");
4616: }
4617: } while ( $pid > 0 );
4618: foreach my $child (keys(%children)) {
4619: $pid = waitpid($child,&WNOHANG());
4620: if ($pid > 0) {
4621: &logthis("Child $child - $pid looks like we missed it's death");
4622: delete($children{$pid});
4623: }
4624: }
4625: &status("Finished Handling child death");
4626: }
4627:
4628: sub HUNTSMAN { # signal handler for SIGINT
4629: &status("Killing children (INT)");
4630: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4631: kill 'INT' => keys %children;
4632: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4633: my $execdir=$perlvar{'lonDaemons'};
4634: unlink("$execdir/logs/lond.pid");
4635: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
4636: &status("Done killing children");
4637: exit; # clean up with dignity
4638: }
4639:
4640: sub HUPSMAN { # signal handler for SIGHUP
4641: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4642: &status("Killing children for restart (HUP)");
4643: kill 'INT' => keys %children;
4644: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4645: &logthis("<font color='red'>CRITICAL: Restarting</font>");
4646: my $execdir=$perlvar{'lonDaemons'};
4647: unlink("$execdir/logs/lond.pid");
4648: &status("Restarting self (HUP)");
4649: exec("$execdir/lond"); # here we go again
4650: }
4651:
4652: #
4653: # Kill off hashes that describe the host table prior to re-reading it.
4654: # Hashes affected are:
4655: # %hostid, %hostdom %hostip %hostdns.
4656: #
4657: sub KillHostHashes {
4658: foreach my $key (keys %hostid) {
4659: delete $hostid{$key};
4660: }
4661: foreach my $key (keys %hostdom) {
4662: delete $hostdom{$key};
4663: }
4664: foreach my $key (keys %hostip) {
4665: delete $hostip{$key};
4666: }
4667: foreach my $key (keys %hostdns) {
4668: delete $hostdns{$key};
4669: }
4670: }
4671: #
4672: # Read in the host table from file and distribute it into the various hashes:
4673: #
4674: # - %hostid - Indexed by IP, the loncapa hostname.
4675: # - %hostdom - Indexed by loncapa hostname, the domain.
4676: # - %hostip - Indexed by hostid, the Ip address of the host.
4677: sub ReadHostTable {
4678:
4679: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
4680: my $myloncapaname = $perlvar{'lonHostID'};
4681: Debug("My loncapa name is : $myloncapaname");
4682: my %name_to_ip;
4683: while (my $configline=<CONFIG>) {
4684: if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
4685: my ($id,$domain,$role,$name)=split(/:/,$configline);
4686: $name=~s/\s//g;
4687: my $ip;
4688: if (!exists($name_to_ip{$name})) {
4689: $ip = gethostbyname($name);
4690: if (!$ip || length($ip) ne 4) {
4691: &logthis("Skipping host $id name $name no IP found\n");
4692: next;
4693: }
4694: $ip=inet_ntoa($ip);
4695: $name_to_ip{$name} = $ip;
4696: } else {
4697: $ip = $name_to_ip{$name};
4698: }
4699: $hostid{$ip}=$id; # LonCAPA name of host by IP.
4700: $hostdom{$id}=$domain; # LonCAPA domain name of host.
4701: $hostip{$id}=$ip; # IP address of host.
4702: $hostdns{$name} = $id; # LonCAPA name of host by DNS.
4703:
4704: if ($id eq $perlvar{'lonHostID'}) {
4705: Debug("Found me in the host table: $name");
4706: $thisserver=$name;
4707: }
4708: }
4709: }
4710: close(CONFIG);
4711: }
4712: #
4713: # Reload the Apache daemon's state.
4714: # This is done by invoking /home/httpd/perl/apachereload
4715: # a setuid perl script that can be root for us to do this job.
4716: #
4717: sub ReloadApache {
4718: my $execdir = $perlvar{'lonDaemons'};
4719: my $script = $execdir."/apachereload";
4720: system($script);
4721: }
4722:
4723: #
4724: # Called in response to a USR2 signal.
4725: # - Reread hosts.tab
4726: # - All children connected to hosts that were removed from hosts.tab
4727: # are killed via SIGINT
4728: # - All children connected to previously existing hosts are sent SIGUSR1
4729: # - Our internal hosts hash is updated to reflect the new contents of
4730: # hosts.tab causing connections from hosts added to hosts.tab to
4731: # now be honored.
4732: #
4733: sub UpdateHosts {
4734: &status("Reload hosts.tab");
4735: logthis('<font color="blue"> Updating connections </font>');
4736: #
4737: # The %children hash has the set of IP's we currently have children
4738: # on. These need to be matched against records in the hosts.tab
4739: # Any ip's no longer in the table get killed off they correspond to
4740: # either dropped or changed hosts. Note that the re-read of the table
4741: # will take care of new and changed hosts as connections come into being.
4742:
4743:
4744: KillHostHashes;
4745: ReadHostTable;
4746:
4747: foreach my $child (keys %children) {
4748: my $childip = $children{$child};
4749: if(!$hostid{$childip}) {
4750: logthis('<font color="blue"> UpdateHosts killing child '
4751: ." $child for ip $childip </font>");
4752: kill('INT', $child);
4753: } else {
4754: logthis('<font color="green"> keeping child for ip '
4755: ." $childip (pid=$child) </font>");
4756: }
4757: }
4758: ReloadApache;
4759: &status("Finished reloading hosts.tab");
4760: }
4761:
4762:
4763: sub checkchildren {
4764: &status("Checking on the children (sending signals)");
4765: &initnewstatus();
4766: &logstatus();
4767: &logthis('Going to check on the children');
4768: my $docdir=$perlvar{'lonDocRoot'};
4769: foreach (sort keys %children) {
4770: #sleep 1;
4771: unless (kill 'USR1' => $_) {
4772: &logthis ('Child '.$_.' is dead');
4773: &logstatus($$.' is dead');
4774: delete($children{$_});
4775: }
4776: }
4777: sleep 5;
4778: $SIG{ALRM} = sub { Debug("timeout");
4779: die "timeout"; };
4780: $SIG{__DIE__} = 'DEFAULT';
4781: &status("Checking on the children (waiting for reports)");
4782: foreach (sort keys %children) {
4783: unless (-e "$docdir/lon-status/londchld/$_.txt") {
4784: eval {
4785: alarm(300);
4786: &logthis('Child '.$_.' did not respond');
4787: kill 9 => $_;
4788: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4789: #$subj="LON: $currenthostid killed lond process $_";
4790: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
4791: #$execdir=$perlvar{'lonDaemons'};
4792: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
4793: delete($children{$_});
4794: alarm(0);
4795: }
4796: }
4797: }
4798: $SIG{ALRM} = 'DEFAULT';
4799: $SIG{__DIE__} = \&catchexception;
4800: &status("Finished checking children");
4801: &logthis('Finished Checking children');
4802: }
4803:
4804: # --------------------------------------------------------------------- Logging
4805:
4806: sub logthis {
4807: my $message=shift;
4808: my $execdir=$perlvar{'lonDaemons'};
4809: my $fh=IO::File->new(">>$execdir/logs/lond.log");
4810: my $now=time;
4811: my $local=localtime($now);
4812: $lastlog=$local.': '.$message;
4813: print $fh "$local ($$): $message\n";
4814: }
4815:
4816: # ------------------------- Conditional log if $DEBUG true.
4817: sub Debug {
4818: my $message = shift;
4819: if($DEBUG) {
4820: &logthis($message);
4821: }
4822: }
4823:
4824: #
4825: # Sub to do replies to client.. this gives a hook for some
4826: # debug tracing too:
4827: # Parameters:
4828: # fd - File open on client.
4829: # reply - Text to send to client.
4830: # request - Original request from client.
4831: #
4832: sub Reply {
4833: my ($fd, $reply, $request) = @_;
4834: print $fd $reply;
4835: Debug("Request was $request Reply was $reply");
4836:
4837: $Transactions++;
4838: }
4839:
4840:
4841: #
4842: # Sub to report a failure.
4843: # This function:
4844: # - Increments the failure statistic counters.
4845: # - Invokes Reply to send the error message to the client.
4846: # Parameters:
4847: # fd - File descriptor open on the client
4848: # reply - Reply text to emit.
4849: # request - The original request message (used by Reply
4850: # to debug if that's enabled.
4851: # Implicit outputs:
4852: # $Failures- The number of failures is incremented.
4853: # Reply (invoked here) sends a message to the
4854: # client:
4855: #
4856: sub Failure {
4857: my $fd = shift;
4858: my $reply = shift;
4859: my $request = shift;
4860:
4861: $Failures++;
4862: Reply($fd, $reply, $request); # That's simple eh?
4863: }
4864: # ------------------------------------------------------------------ Log status
4865:
4866: sub logstatus {
4867: &status("Doing logging");
4868: my $docdir=$perlvar{'lonDocRoot'};
4869: {
4870: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
4871: print $fh $status."\n".$lastlog."\n".time."\n$keymode";
4872: $fh->close();
4873: }
4874: &status("Finished $$.txt");
4875: {
4876: open(LOG,">>$docdir/lon-status/londstatus.txt");
4877: flock(LOG,LOCK_EX);
4878: print LOG $$."\t".$clientname."\t".$currenthostid."\t"
4879: .$status."\t".$lastlog."\t $keymode\n";
4880: flock(LOG,LOCK_UN);
4881: close(LOG);
4882: }
4883: &status("Finished logging");
4884: }
4885:
4886: sub initnewstatus {
4887: my $docdir=$perlvar{'lonDocRoot'};
4888: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
4889: my $now=time;
4890: my $local=localtime($now);
4891: print $fh "LOND status $local - parent $$\n\n";
4892: opendir(DIR,"$docdir/lon-status/londchld");
4893: while (my $filename=readdir(DIR)) {
4894: unlink("$docdir/lon-status/londchld/$filename");
4895: }
4896: closedir(DIR);
4897: }
4898:
4899: # -------------------------------------------------------------- Status setting
4900:
4901: sub status {
4902: my $what=shift;
4903: my $now=time;
4904: my $local=localtime($now);
4905: $status=$local.': '.$what;
4906: $0='lond: '.$what.' '.$local;
4907: }
4908:
4909: # -------------------------------------------------------- Escape Special Chars
4910:
4911: sub escape {
4912: my $str=shift;
4913: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
4914: return $str;
4915: }
4916:
4917: # ----------------------------------------------------- Un-Escape Special Chars
4918:
4919: sub unescape {
4920: my $str=shift;
4921: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
4922: return $str;
4923: }
4924:
4925: # ----------------------------------------------------------- Send USR1 to lonc
4926:
4927: sub reconlonc {
4928: my $peerfile=shift;
4929: &logthis("Trying to reconnect for $peerfile");
4930: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
4931: if (my $fh=IO::File->new("$loncfile")) {
4932: my $loncpid=<$fh>;
4933: chomp($loncpid);
4934: if (kill 0 => $loncpid) {
4935: &logthis("lonc at pid $loncpid responding, sending USR1");
4936: kill USR1 => $loncpid;
4937: } else {
4938: &logthis(
4939: "<font color='red'>CRITICAL: "
4940: ."lonc at pid $loncpid not responding, giving up</font>");
4941: }
4942: } else {
4943: &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
4944: }
4945: }
4946:
4947: # -------------------------------------------------- Non-critical communication
4948:
4949: sub subreply {
4950: my ($cmd,$server)=@_;
4951: my $peerfile="$perlvar{'lonSockDir'}/$server";
4952: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
4953: Type => SOCK_STREAM,
4954: Timeout => 10)
4955: or return "con_lost";
4956: print $sclient "$cmd\n";
4957: my $answer=<$sclient>;
4958: chomp($answer);
4959: if (!$answer) { $answer="con_lost"; }
4960: return $answer;
4961: }
4962:
4963: sub reply {
4964: my ($cmd,$server)=@_;
4965: my $answer;
4966: if ($server ne $currenthostid) {
4967: $answer=subreply($cmd,$server);
4968: if ($answer eq 'con_lost') {
4969: $answer=subreply("ping",$server);
4970: if ($answer ne $server) {
4971: &logthis("sub reply: answer != server answer is $answer, server is $server");
4972: &reconlonc("$perlvar{'lonSockDir'}/$server");
4973: }
4974: $answer=subreply($cmd,$server);
4975: }
4976: } else {
4977: $answer='self_reply';
4978: }
4979: return $answer;
4980: }
4981:
4982: # -------------------------------------------------------------- Talk to lonsql
4983:
4984: sub sql_reply {
4985: my ($cmd)=@_;
4986: my $answer=&sub_sql_reply($cmd);
4987: if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
4988: return $answer;
4989: }
4990:
4991: sub sub_sql_reply {
4992: my ($cmd)=@_;
4993: my $unixsock="mysqlsock";
4994: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
4995: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
4996: Type => SOCK_STREAM,
4997: Timeout => 10)
4998: or return "con_lost";
4999: print $sclient "$cmd\n";
5000: my $answer=<$sclient>;
5001: chomp($answer);
5002: if (!$answer) { $answer="con_lost"; }
5003: return $answer;
5004: }
5005:
5006: # -------------------------------------------- Return path to profile directory
5007:
5008: sub propath {
5009: my ($udom,$uname)=@_;
5010: $udom=~s/\W//g;
5011: $uname=~s/\W//g;
5012: my $subdir=$uname.'__';
5013: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
5014: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
5015: return $proname;
5016: }
5017:
5018: # --------------------------------------- Is this the home server of an author?
5019:
5020: sub ishome {
5021: my $author=shift;
5022: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
5023: my ($udom,$uname)=split(/\//,$author);
5024: my $proname=propath($udom,$uname);
5025: if (-e $proname) {
5026: return 'owner';
5027: } else {
5028: return 'not_owner';
5029: }
5030: }
5031:
5032: # ======================================================= Continue main program
5033: # ---------------------------------------------------- Fork once and dissociate
5034:
5035: my $fpid=fork;
5036: exit if $fpid;
5037: die "Couldn't fork: $!" unless defined ($fpid);
5038:
5039: POSIX::setsid() or die "Can't start new session: $!";
5040:
5041: # ------------------------------------------------------- Write our PID on disk
5042:
5043: my $execdir=$perlvar{'lonDaemons'};
5044: open (PIDSAVE,">$execdir/logs/lond.pid");
5045: print PIDSAVE "$$\n";
5046: close(PIDSAVE);
5047: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
5048: &status('Starting');
5049:
5050:
5051:
5052: # ----------------------------------------------------- Install signal handlers
5053:
5054:
5055: $SIG{CHLD} = \&REAPER;
5056: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
5057: $SIG{HUP} = \&HUPSMAN;
5058: $SIG{USR1} = \&checkchildren;
5059: $SIG{USR2} = \&UpdateHosts;
5060:
5061: # Read the host hashes:
5062:
5063: ReadHostTable;
5064:
5065: my $dist=`$perlvar{'lonDaemons'}/distprobe`;
5066:
5067: # --------------------------------------------------------------
5068: # Accept connections. When a connection comes in, it is validated
5069: # and if good, a child process is created to process transactions
5070: # along the connection.
5071:
5072: while (1) {
5073: &status('Starting accept');
5074: $client = $server->accept() or next;
5075: &status('Accepted '.$client.' off to spawn');
5076: make_new_child($client);
5077: &status('Finished spawning');
5078: }
5079:
5080: sub make_new_child {
5081: my $pid;
5082: # my $cipher; # Now global
5083: my $sigset;
5084:
5085: $client = shift;
5086: &status('Starting new child '.$client);
5087: &logthis('<font color="green"> Attempting to start child ('.$client.
5088: ")</font>");
5089: # block signal for fork
5090: $sigset = POSIX::SigSet->new(SIGINT);
5091: sigprocmask(SIG_BLOCK, $sigset)
5092: or die "Can't block SIGINT for fork: $!\n";
5093:
5094: die "fork: $!" unless defined ($pid = fork);
5095:
5096: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
5097: # connection liveness.
5098:
5099: #
5100: # Figure out who we're talking to so we can record the peer in
5101: # the pid hash.
5102: #
5103: my $caller = getpeername($client);
5104: my ($port,$iaddr);
5105: if (defined($caller) && length($caller) > 0) {
5106: ($port,$iaddr)=unpack_sockaddr_in($caller);
5107: } else {
5108: &logthis("Unable to determine who caller was, getpeername returned nothing");
5109: }
5110: if (defined($iaddr)) {
5111: $clientip = inet_ntoa($iaddr);
5112: Debug("Connected with $clientip");
5113: } else {
5114: &logthis("Unable to determine clientip");
5115: $clientip='Unavailable';
5116: }
5117:
5118: if ($pid) {
5119: # Parent records the child's birth and returns.
5120: sigprocmask(SIG_UNBLOCK, $sigset)
5121: or die "Can't unblock SIGINT for fork: $!\n";
5122: $children{$pid} = $clientip;
5123: &status('Started child '.$pid);
5124: return;
5125: } else {
5126: # Child can *not* return from this subroutine.
5127: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
5128: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
5129: #don't get intercepted
5130: $SIG{USR1}= \&logstatus;
5131: $SIG{ALRM}= \&timeout;
5132: $lastlog='Forked ';
5133: $status='Forked';
5134:
5135: # unblock signals
5136: sigprocmask(SIG_UNBLOCK, $sigset)
5137: or die "Can't unblock SIGINT for fork: $!\n";
5138:
5139: # my $tmpsnum=0; # Now global
5140: #---------------------------------------------------- kerberos 5 initialization
5141: &Authen::Krb5::init_context();
5142: unless (($dist eq 'fedora4') || ($dist eq 'suse9.3')) {
5143: &Authen::Krb5::init_ets();
5144: }
5145:
5146: &status('Accepted connection');
5147: # =============================================================================
5148: # do something with the connection
5149: # -----------------------------------------------------------------------------
5150: # see if we know client and 'check' for spoof IP by ineffective challenge
5151:
5152: ReadManagerTable; # May also be a manager!!
5153:
5154: my $outsideip=$clientip;
5155: if ($clientip eq '127.0.0.1') {
5156: $outsideip=$hostip{$perlvar{'lonHostID'}};
5157: }
5158:
5159: my $clientrec=($hostid{$outsideip} ne undef);
5160: my $ismanager=($managers{$outsideip} ne undef);
5161: $clientname = "[unknonwn]";
5162: if($clientrec) { # Establish client type.
5163: $ConnectionType = "client";
5164: $clientname = $hostid{$outsideip};
5165: if($ismanager) {
5166: $ConnectionType = "both";
5167: }
5168: } else {
5169: $ConnectionType = "manager";
5170: $clientname = $managers{$outsideip};
5171: }
5172: my $clientok;
5173:
5174: if ($clientrec || $ismanager) {
5175: &status("Waiting for init from $clientip $clientname");
5176: &logthis('<font color="yellow">INFO: Connection, '.
5177: $clientip.
5178: " ($clientname) connection type = $ConnectionType </font>" );
5179: &status("Connecting $clientip ($clientname))");
5180: my $remotereq=<$client>;
5181: chomp($remotereq);
5182: Debug("Got init: $remotereq");
5183: my $inikeyword = split(/:/, $remotereq);
5184: if ($remotereq =~ /^init/) {
5185: &sethost("sethost:$perlvar{'lonHostID'}");
5186: #
5187: # If the remote is attempting a local init... give that a try:
5188: #
5189: my ($i, $inittype) = split(/:/, $remotereq);
5190:
5191: # If the connection type is ssl, but I didn't get my
5192: # certificate files yet, then I'll drop back to
5193: # insecure (if allowed).
5194:
5195: if($inittype eq "ssl") {
5196: my ($ca, $cert) = lonssl::CertificateFile;
5197: my $kfile = lonssl::KeyFile;
5198: if((!$ca) ||
5199: (!$cert) ||
5200: (!$kfile)) {
5201: $inittype = ""; # This forces insecure attempt.
5202: &logthis("<font color=\"blue\"> Certificates not "
5203: ."installed -- trying insecure auth</font>");
5204: } else { # SSL certificates are in place so
5205: } # Leave the inittype alone.
5206: }
5207:
5208: if($inittype eq "local") {
5209: my $key = LocalConnection($client, $remotereq);
5210: if($key) {
5211: Debug("Got local key $key");
5212: $clientok = 1;
5213: my $cipherkey = pack("H32", $key);
5214: $cipher = new IDEA($cipherkey);
5215: print $client "ok:local\n";
5216: &logthis('<font color="green"'
5217: . "Successful local authentication </font>");
5218: $keymode = "local"
5219: } else {
5220: Debug("Failed to get local key");
5221: $clientok = 0;
5222: shutdown($client, 3);
5223: close $client;
5224: }
5225: } elsif ($inittype eq "ssl") {
5226: my $key = SSLConnection($client);
5227: if ($key) {
5228: $clientok = 1;
5229: my $cipherkey = pack("H32", $key);
5230: $cipher = new IDEA($cipherkey);
5231: &logthis('<font color="green">'
5232: ."Successfull ssl authentication with $clientname </font>");
5233: $keymode = "ssl";
5234:
5235: } else {
5236: $clientok = 0;
5237: close $client;
5238: }
5239:
5240: } else {
5241: my $ok = InsecureConnection($client);
5242: if($ok) {
5243: $clientok = 1;
5244: &logthis('<font color="green">'
5245: ."Successful insecure authentication with $clientname </font>");
5246: print $client "ok\n";
5247: $keymode = "insecure";
5248: } else {
5249: &logthis('<font color="yellow">'
5250: ."Attempted insecure connection disallowed </font>");
5251: close $client;
5252: $clientok = 0;
5253:
5254: }
5255: }
5256: } else {
5257: &logthis(
5258: "<font color='blue'>WARNING: "
5259: ."$clientip failed to initialize: >$remotereq< </font>");
5260: &status('No init '.$clientip);
5261: }
5262:
5263: } else {
5264: &logthis(
5265: "<font color='blue'>WARNING: Unknown client $clientip</font>");
5266: &status('Hung up on '.$clientip);
5267: }
5268:
5269: if ($clientok) {
5270: # ---------------- New known client connecting, could mean machine online again
5271:
5272: foreach my $id (keys(%hostip)) {
5273: if ($hostip{$id} ne $clientip ||
5274: $hostip{$currenthostid} eq $clientip) {
5275: # no need to try to do recon's to myself
5276: next;
5277: }
5278: &reconlonc("$perlvar{'lonSockDir'}/$id");
5279: }
5280: &logthis("<font color='green'>Established connection: $clientname</font>");
5281: &status('Will listen to '.$clientname);
5282: # ------------------------------------------------------------ Process requests
5283: my $keep_going = 1;
5284: my $user_input;
5285: while(($user_input = get_request) && $keep_going) {
5286: alarm(120);
5287: Debug("Main: Got $user_input\n");
5288: $keep_going = &process_request($user_input);
5289: alarm(0);
5290: &status('Listening to '.$clientname." ($keymode)");
5291: }
5292:
5293: # --------------------------------------------- client unknown or fishy, refuse
5294: } else {
5295: print $client "refused\n";
5296: $client->close();
5297: &logthis("<font color='blue'>WARNING: "
5298: ."Rejected client $clientip, closing connection</font>");
5299: }
5300: }
5301:
5302: # =============================================================================
5303:
5304: &logthis("<font color='red'>CRITICAL: "
5305: ."Disconnect from $clientip ($clientname)</font>");
5306:
5307:
5308: # this exit is VERY important, otherwise the child will become
5309: # a producer of more and more children, forking yourself into
5310: # process death.
5311: exit;
5312:
5313: }
5314: #
5315: # Determine if a user is an author for the indicated domain.
5316: #
5317: # Parameters:
5318: # domain - domain to check in .
5319: # user - Name of user to check.
5320: #
5321: # Return:
5322: # 1 - User is an author for domain.
5323: # 0 - User is not an author for domain.
5324: sub is_author {
5325: my ($domain, $user) = @_;
5326:
5327: &Debug("is_author: $user @ $domain");
5328:
5329: my $hashref = &tie_user_hash($domain, $user, "roles",
5330: &GDBM_READER());
5331:
5332: # Author role should show up as a key /domain/_au
5333:
5334: my $key = "/$domain/_au";
5335: my $value = $hashref->{$key};
5336:
5337: if(defined($value)) {
5338: &Debug("$user @ $domain is an author");
5339: }
5340:
5341: return defined($value);
5342: }
5343: #
5344: # Checks to see if the input roleput request was to set
5345: # an author role. If so, invokes the lchtmldir script to set
5346: # up a correct public_html
5347: # Parameters:
5348: # request - The request sent to the rolesput subchunk.
5349: # We're looking for /domain/_au
5350: # domain - The domain in which the user is having roles doctored.
5351: # user - Name of the user for which the role is being put.
5352: # authtype - The authentication type associated with the user.
5353: #
5354: sub manage_permissions {
5355: my ($request, $domain, $user, $authtype) = @_;
5356:
5357: &Debug("manage_permissions: $request $domain $user $authtype");
5358:
5359: # See if the request is of the form /$domain/_au
5360: if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
5361: my $execdir = $perlvar{'lonDaemons'};
5362: my $userhome= "/home/$user" ;
5363: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
5364: &Debug("Setting homedir permissions for $userhome");
5365: system("$execdir/lchtmldir $userhome $user $authtype");
5366: }
5367: }
5368:
5369:
5370: #
5371: # Return the full path of a user password file, whether it exists or not.
5372: # Parameters:
5373: # domain - Domain in which the password file lives.
5374: # user - name of the user.
5375: # Returns:
5376: # Full passwd path:
5377: #
5378: sub password_path {
5379: my ($domain, $user) = @_;
5380: return &propath($domain, $user).'/passwd';
5381: }
5382:
5383: # Password Filename
5384: # Returns the path to a passwd file given domain and user... only if
5385: # it exists.
5386: # Parameters:
5387: # domain - Domain in which to search.
5388: # user - username.
5389: # Returns:
5390: # - If the password file exists returns its path.
5391: # - If the password file does not exist, returns undefined.
5392: #
5393: sub password_filename {
5394: my ($domain, $user) = @_;
5395:
5396: Debug ("PasswordFilename called: dom = $domain user = $user");
5397:
5398: my $path = &password_path($domain, $user);
5399: Debug("PasswordFilename got path: $path");
5400: if(-e $path) {
5401: return $path;
5402: } else {
5403: return undef;
5404: }
5405: }
5406:
5407: #
5408: # Rewrite the contents of the user's passwd file.
5409: # Parameters:
5410: # domain - domain of the user.
5411: # name - User's name.
5412: # contents - New contents of the file.
5413: # Returns:
5414: # 0 - Failed.
5415: # 1 - Success.
5416: #
5417: sub rewrite_password_file {
5418: my ($domain, $user, $contents) = @_;
5419:
5420: my $file = &password_filename($domain, $user);
5421: if (defined $file) {
5422: my $pf = IO::File->new(">$file");
5423: if($pf) {
5424: print $pf "$contents\n";
5425: return 1;
5426: } else {
5427: return 0;
5428: }
5429: } else {
5430: return 0;
5431: }
5432:
5433: }
5434:
5435: #
5436: # get_auth_type - Determines the authorization type of a user in a domain.
5437:
5438: # Returns the authorization type or nouser if there is no such user.
5439: #
5440: sub get_auth_type
5441: {
5442:
5443: my ($domain, $user) = @_;
5444:
5445: Debug("get_auth_type( $domain, $user ) \n");
5446: my $proname = &propath($domain, $user);
5447: my $passwdfile = "$proname/passwd";
5448: if( -e $passwdfile ) {
5449: my $pf = IO::File->new($passwdfile);
5450: my $realpassword = <$pf>;
5451: chomp($realpassword);
5452: Debug("Password info = $realpassword\n");
5453: my ($authtype, $contentpwd) = split(/:/, $realpassword);
5454: Debug("Authtype = $authtype, content = $contentpwd\n");
5455: return "$authtype:$contentpwd";
5456: } else {
5457: Debug("Returning nouser");
5458: return "nouser";
5459: }
5460: }
5461:
5462: #
5463: # Validate a user given their domain, name and password. This utility
5464: # function is used by both AuthenticateHandler and ChangePasswordHandler
5465: # to validate the login credentials of a user.
5466: # Parameters:
5467: # $domain - The domain being logged into (this is required due to
5468: # the capability for multihomed systems.
5469: # $user - The name of the user being validated.
5470: # $password - The user's propoposed password.
5471: #
5472: # Returns:
5473: # 1 - The domain,user,pasword triplet corresponds to a valid
5474: # user.
5475: # 0 - The domain,user,password triplet is not a valid user.
5476: #
5477: sub validate_user {
5478: my ($domain, $user, $password) = @_;
5479:
5480:
5481: # Why negative ~pi you may well ask? Well this function is about
5482: # authentication, and therefore very important to get right.
5483: # I've initialized the flag that determines whether or not I've
5484: # validated correctly to a value it's not supposed to get.
5485: # At the end of this function. I'll ensure that it's not still that
5486: # value so we don't just wind up returning some accidental value
5487: # as a result of executing an unforseen code path that
5488: # did not set $validated. At the end of valid execution paths,
5489: # validated shoule be 1 for success or 0 for failuer.
5490:
5491: my $validated = -3.14159;
5492:
5493: # How we authenticate is determined by the type of authentication
5494: # the user has been assigned. If the authentication type is
5495: # "nouser", the user does not exist so we will return 0.
5496:
5497: my $contents = &get_auth_type($domain, $user);
5498: my ($howpwd, $contentpwd) = split(/:/, $contents);
5499:
5500: my $null = pack("C",0); # Used by kerberos auth types.
5501:
5502: if ($howpwd ne 'nouser') {
5503:
5504: if($howpwd eq "internal") { # Encrypted is in local password file.
5505: $validated = (crypt($password, $contentpwd) eq $contentpwd);
5506: }
5507: elsif ($howpwd eq "unix") { # User is a normal unix user.
5508: $contentpwd = (getpwnam($user))[1];
5509: if($contentpwd) {
5510: if($contentpwd eq 'x') { # Shadow password file...
5511: my $pwauth_path = "/usr/local/sbin/pwauth";
5512: open PWAUTH, "|$pwauth_path" or
5513: die "Cannot invoke authentication";
5514: print PWAUTH "$user\n$password\n";
5515: close PWAUTH;
5516: $validated = ! $?;
5517:
5518: } else { # Passwords in /etc/passwd.
5519: $validated = (crypt($password,
5520: $contentpwd) eq $contentpwd);
5521: }
5522: } else {
5523: $validated = 0;
5524: }
5525: }
5526: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
5527: if(! ($password =~ /$null/) ) {
5528: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
5529: "",
5530: $contentpwd,,
5531: 'krbtgt',
5532: $contentpwd,
5533: 1,
5534: $password);
5535: if(!$k4error) {
5536: $validated = 1;
5537: } else {
5538: $validated = 0;
5539: &logthis('krb4: '.$user.', '.$contentpwd.', '.
5540: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
5541: }
5542: } else {
5543: $validated = 0; # Password has a match with null.
5544: }
5545: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
5546: if(!($password =~ /$null/)) { # Null password not allowed.
5547: my $krbclient = &Authen::Krb5::parse_name($user.'@'
5548: .$contentpwd);
5549: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
5550: my $krbserver = &Authen::Krb5::parse_name($krbservice);
5551: my $credentials= &Authen::Krb5::cc_default();
5552: $credentials->initialize($krbclient);
5553: my $krbreturn = &Authen::Krb5::get_in_tkt_with_password($krbclient,
5554: $krbserver,
5555: $password,
5556: $credentials);
5557: $validated = ($krbreturn == 1);
5558: } else {
5559: $validated = 0;
5560: }
5561: } elsif ($howpwd eq "localauth") {
5562: # Authenticate via installation specific authentcation method:
5563: $validated = &localauth::localauth($user,
5564: $password,
5565: $contentpwd);
5566: } else { # Unrecognized auth is also bad.
5567: $validated = 0;
5568: }
5569: } else {
5570: $validated = 0;
5571: }
5572: #
5573: # $validated has the correct stat of the authentication:
5574: #
5575:
5576: unless ($validated != -3.14159) {
5577: # I >really really< want to know if this happens.
5578: # since it indicates that user authentication is badly
5579: # broken in some code path.
5580: #
5581: die "ValidateUser - failed to set the value of validated $domain, $user $password";
5582: }
5583: return $validated;
5584: }
5585:
5586:
5587: sub addline {
5588: my ($fname,$hostid,$ip,$newline)=@_;
5589: my $contents;
5590: my $found=0;
5591: my $expr='^'.$hostid.':'.$ip.':';
5592: $expr =~ s/\./\\\./g;
5593: my $sh;
5594: if ($sh=IO::File->new("$fname.subscription")) {
5595: while (my $subline=<$sh>) {
5596: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
5597: }
5598: $sh->close();
5599: }
5600: $sh=IO::File->new(">$fname.subscription");
5601: if ($contents) { print $sh $contents; }
5602: if ($newline) { print $sh $newline; }
5603: $sh->close();
5604: return $found;
5605: }
5606:
5607: sub get_chat {
5608: my ($cdom,$cname,$udom,$uname)=@_;
5609: my %hash;
5610: my $proname=&propath($cdom,$cname);
5611: my @entries=();
5612: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
5613: &GDBM_READER(),0640)) {
5614: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
5615: untie %hash;
5616: }
5617: my @participants=();
5618: my $cutoff=time-60;
5619: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
5620: &GDBM_WRCREAT(),0640)) {
5621: $hash{$uname.':'.$udom}=time;
5622: foreach (sort keys %hash) {
5623: if ($hash{$_}>$cutoff) {
5624: $participants[$#participants+1]='active_participant:'.$_;
5625: }
5626: }
5627: untie %hash;
5628: }
5629: return (@participants,@entries);
5630: }
5631:
5632: sub chat_add {
5633: my ($cdom,$cname,$newchat)=@_;
5634: my %hash;
5635: my $proname=&propath($cdom,$cname);
5636: my @entries=();
5637: my $time=time;
5638: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
5639: &GDBM_WRCREAT(),0640)) {
5640: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
5641: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
5642: my ($thentime,$idnum)=split(/\_/,$lastid);
5643: my $newid=$time.'_000000';
5644: if ($thentime==$time) {
5645: $idnum=~s/^0+//;
5646: $idnum++;
5647: $idnum=substr('000000'.$idnum,-6,6);
5648: $newid=$time.'_'.$idnum;
5649: }
5650: $hash{$newid}=$newchat;
5651: my $expired=$time-3600;
5652: foreach (keys %hash) {
5653: my ($thistime)=($_=~/(\d+)\_/);
5654: if ($thistime<$expired) {
5655: delete $hash{$_};
5656: }
5657: }
5658: untie %hash;
5659: }
5660: {
5661: my $hfh;
5662: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
5663: print $hfh "$time:".&unescape($newchat)."\n";
5664: }
5665: }
5666: }
5667:
5668: sub unsub {
5669: my ($fname,$clientip)=@_;
5670: my $result;
5671: my $unsubs = 0; # Number of successful unsubscribes:
5672:
5673:
5674: # An old way subscriptions were handled was to have a
5675: # subscription marker file:
5676:
5677: Debug("Attempting unlink of $fname.$clientname");
5678: if (unlink("$fname.$clientname")) {
5679: $unsubs++; # Successful unsub via marker file.
5680: }
5681:
5682: # The more modern way to do it is to have a subscription list
5683: # file:
5684:
5685: if (-e "$fname.subscription") {
5686: my $found=&addline($fname,$clientname,$clientip,'');
5687: if ($found) {
5688: $unsubs++;
5689: }
5690: }
5691:
5692: # If either or both of these mechanisms succeeded in unsubscribing a
5693: # resource we can return ok:
5694:
5695: if($unsubs) {
5696: $result = "ok\n";
5697: } else {
5698: $result = "not_subscribed\n";
5699: }
5700:
5701: return $result;
5702: }
5703:
5704: sub currentversion {
5705: my $fname=shift;
5706: my $version=-1;
5707: my $ulsdir='';
5708: if ($fname=~/^(.+)\/[^\/]+$/) {
5709: $ulsdir=$1;
5710: }
5711: my ($fnamere1,$fnamere2);
5712: # remove version if already specified
5713: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
5714: # get the bits that go before and after the version number
5715: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
5716: $fnamere1=$1;
5717: $fnamere2='.'.$2;
5718: }
5719: if (-e $fname) { $version=1; }
5720: if (-e $ulsdir) {
5721: if(-d $ulsdir) {
5722: if (opendir(LSDIR,$ulsdir)) {
5723: my $ulsfn;
5724: while ($ulsfn=readdir(LSDIR)) {
5725: # see if this is a regular file (ignore links produced earlier)
5726: my $thisfile=$ulsdir.'/'.$ulsfn;
5727: unless (-l $thisfile) {
5728: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
5729: if ($1>$version) { $version=$1; }
5730: }
5731: }
5732: }
5733: closedir(LSDIR);
5734: $version++;
5735: }
5736: }
5737: }
5738: return $version;
5739: }
5740:
5741: sub thisversion {
5742: my $fname=shift;
5743: my $version=-1;
5744: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
5745: $version=$1;
5746: }
5747: return $version;
5748: }
5749:
5750: sub subscribe {
5751: my ($userinput,$clientip)=@_;
5752: my $result;
5753: my ($cmd,$fname)=split(/:/,$userinput,2);
5754: my $ownership=&ishome($fname);
5755: if ($ownership eq 'owner') {
5756: # explitly asking for the current version?
5757: unless (-e $fname) {
5758: my $currentversion=¤tversion($fname);
5759: if (&thisversion($fname)==$currentversion) {
5760: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
5761: my $root=$1;
5762: my $extension=$2;
5763: symlink($root.'.'.$extension,
5764: $root.'.'.$currentversion.'.'.$extension);
5765: unless ($extension=~/\.meta$/) {
5766: symlink($root.'.'.$extension.'.meta',
5767: $root.'.'.$currentversion.'.'.$extension.'.meta');
5768: }
5769: }
5770: }
5771: }
5772: if (-e $fname) {
5773: if (-d $fname) {
5774: $result="directory\n";
5775: } else {
5776: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
5777: my $now=time;
5778: my $found=&addline($fname,$clientname,$clientip,
5779: "$clientname:$clientip:$now\n");
5780: if ($found) { $result="$fname\n"; }
5781: # if they were subscribed to only meta data, delete that
5782: # subscription, when you subscribe to a file you also get
5783: # the metadata
5784: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
5785: $fname=~s/\/home\/httpd\/html\/res/raw/;
5786: $fname="http://$thisserver/".$fname;
5787: $result="$fname\n";
5788: }
5789: } else {
5790: $result="not_found\n";
5791: }
5792: } else {
5793: $result="rejected\n";
5794: }
5795: return $result;
5796: }
5797: # Change the passwd of a unix user. The caller must have
5798: # first verified that the user is a loncapa user.
5799: #
5800: # Parameters:
5801: # user - Unix user name to change.
5802: # pass - New password for the user.
5803: # Returns:
5804: # ok - if success
5805: # other - Some meaningfule error message string.
5806: # NOTE:
5807: # invokes a setuid script to change the passwd.
5808: sub change_unix_password {
5809: my ($user, $pass) = @_;
5810:
5811: &Debug("change_unix_password");
5812: my $execdir=$perlvar{'lonDaemons'};
5813: &Debug("Opening lcpasswd pipeline");
5814: my $pf = IO::File->new("|$execdir/lcpasswd > "
5815: ."$perlvar{'lonDaemons'}"
5816: ."/logs/lcpasswd.log");
5817: print $pf "$user\n$pass\n$pass\n";
5818: close $pf;
5819: my $err = $?;
5820: return ($err < @passwderrors) ? $passwderrors[$err] :
5821: "pwchange_falure - unknown error";
5822:
5823:
5824: }
5825:
5826:
5827: sub make_passwd_file {
5828: my ($uname, $umode,$npass,$passfilename)=@_;
5829: my $result="ok\n";
5830: if ($umode eq 'krb4' or $umode eq 'krb5') {
5831: {
5832: my $pf = IO::File->new(">$passfilename");
5833: if ($pf) {
5834: print $pf "$umode:$npass\n";
5835: } else {
5836: $result = "pass_file_failed_error";
5837: }
5838: }
5839: } elsif ($umode eq 'internal') {
5840: my $salt=time;
5841: $salt=substr($salt,6,2);
5842: my $ncpass=crypt($npass,$salt);
5843: {
5844: &Debug("Creating internal auth");
5845: my $pf = IO::File->new(">$passfilename");
5846: if($pf) {
5847: print $pf "internal:$ncpass\n";
5848: } else {
5849: $result = "pass_file_failed_error";
5850: }
5851: }
5852: } elsif ($umode eq 'localauth') {
5853: {
5854: my $pf = IO::File->new(">$passfilename");
5855: if($pf) {
5856: print $pf "localauth:$npass\n";
5857: } else {
5858: $result = "pass_file_failed_error";
5859: }
5860: }
5861: } elsif ($umode eq 'unix') {
5862: {
5863: #
5864: # Don't allow the creation of privileged accounts!!! that would
5865: # be real bad!!!
5866: #
5867: my $uid = getpwnam($uname);
5868: if((defined $uid) && ($uid == 0)) {
5869: &logthis(">>>Attempted to create privilged account blocked");
5870: return "no_priv_account_error\n";
5871: }
5872:
5873: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
5874:
5875: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
5876: {
5877: &Debug("Executing external: ".$execpath);
5878: &Debug("user = ".$uname.", Password =". $npass);
5879: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
5880: print $se "$uname\n";
5881: print $se "$npass\n";
5882: print $se "$npass\n";
5883: print $se "$lc_error_file\n"; # Status -> unique file.
5884: }
5885: if (-r $lc_error_file) {
5886: &Debug("Opening error file: $lc_error_file");
5887: my $error = IO::File->new("< $lc_error_file");
5888: my $useraddok = <$error>;
5889: $error->close;
5890: unlink($lc_error_file);
5891:
5892: chomp $useraddok;
5893:
5894: if($useraddok > 0) {
5895: my $error_text = &lcuseraddstrerror($useraddok);
5896: &logthis("Failed lcuseradd: $error_text");
5897: $result = "lcuseradd_failed:$error_text\n";
5898: } else {
5899: my $pf = IO::File->new(">$passfilename");
5900: if($pf) {
5901: print $pf "unix:\n";
5902: } else {
5903: $result = "pass_file_failed_error";
5904: }
5905: }
5906: } else {
5907: &Debug("Could not locate lcuseradd error: $lc_error_file");
5908: $result="bug_lcuseradd_no_output_file";
5909: }
5910: }
5911: } elsif ($umode eq 'none') {
5912: {
5913: my $pf = IO::File->new("> $passfilename");
5914: if($pf) {
5915: print $pf "none:\n";
5916: } else {
5917: $result = "pass_file_failed_error";
5918: }
5919: }
5920: } else {
5921: $result="auth_mode_error\n";
5922: }
5923: return $result;
5924: }
5925:
5926: sub convert_photo {
5927: my ($start,$dest)=@_;
5928: system("convert $start $dest");
5929: }
5930:
5931: sub sethost {
5932: my ($remotereq) = @_;
5933: my (undef,$hostid)=split(/:/,$remotereq);
5934: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
5935: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
5936: $currenthostid =$hostid;
5937: $currentdomainid=$hostdom{$hostid};
5938: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
5939: } else {
5940: &logthis("Requested host id $hostid not an alias of ".
5941: $perlvar{'lonHostID'}." refusing connection");
5942: return 'unable_to_set';
5943: }
5944: return 'ok';
5945: }
5946:
5947: sub version {
5948: my ($userinput)=@_;
5949: $remoteVERSION=(split(/:/,$userinput))[1];
5950: return "version:$VERSION";
5951: }
5952:
5953: #There is a copy of this in lonnet.pm
5954: sub userload {
5955: my $numusers=0;
5956: {
5957: opendir(LONIDS,$perlvar{'lonIDsDir'});
5958: my $filename;
5959: my $curtime=time;
5960: while ($filename=readdir(LONIDS)) {
5961: if ($filename eq '.' || $filename eq '..') {next;}
5962: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
5963: if ($curtime-$mtime < 1800) { $numusers++; }
5964: }
5965: closedir(LONIDS);
5966: }
5967: my $userloadpercent=0;
5968: my $maxuserload=$perlvar{'lonUserLoadLim'};
5969: if ($maxuserload) {
5970: $userloadpercent=100*$numusers/$maxuserload;
5971: }
5972: $userloadpercent=sprintf("%.2f",$userloadpercent);
5973: return $userloadpercent;
5974: }
5975:
5976: # Routines for serializing arrays and hashes (copies from lonnet)
5977:
5978: sub array2str {
5979: my (@array) = @_;
5980: my $result=&arrayref2str(\@array);
5981: $result=~s/^__ARRAY_REF__//;
5982: $result=~s/__END_ARRAY_REF__$//;
5983: return $result;
5984: }
5985:
5986: sub arrayref2str {
5987: my ($arrayref) = @_;
5988: my $result='__ARRAY_REF__';
5989: foreach my $elem (@$arrayref) {
5990: if(ref($elem) eq 'ARRAY') {
5991: $result.=&arrayref2str($elem).'&';
5992: } elsif(ref($elem) eq 'HASH') {
5993: $result.=&hashref2str($elem).'&';
5994: } elsif(ref($elem)) {
5995: #print("Got a ref of ".(ref($elem))." skipping.");
5996: } else {
5997: $result.=&escape($elem).'&';
5998: }
5999: }
6000: $result=~s/\&$//;
6001: $result .= '__END_ARRAY_REF__';
6002: return $result;
6003: }
6004:
6005: sub hash2str {
6006: my (%hash) = @_;
6007: my $result=&hashref2str(\%hash);
6008: $result=~s/^__HASH_REF__//;
6009: $result=~s/__END_HASH_REF__$//;
6010: return $result;
6011: }
6012:
6013: sub hashref2str {
6014: my ($hashref)=@_;
6015: my $result='__HASH_REF__';
6016: foreach (sort(keys(%$hashref))) {
6017: if (ref($_) eq 'ARRAY') {
6018: $result.=&arrayref2str($_).'=';
6019: } elsif (ref($_) eq 'HASH') {
6020: $result.=&hashref2str($_).'=';
6021: } elsif (ref($_)) {
6022: $result.='=';
6023: #print("Got a ref of ".(ref($_))." skipping.");
6024: } else {
6025: if ($_) {$result.=&escape($_).'=';} else { last; }
6026: }
6027:
6028: if(ref($hashref->{$_}) eq 'ARRAY') {
6029: $result.=&arrayref2str($hashref->{$_}).'&';
6030: } elsif(ref($hashref->{$_}) eq 'HASH') {
6031: $result.=&hashref2str($hashref->{$_}).'&';
6032: } elsif(ref($hashref->{$_})) {
6033: $result.='&';
6034: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
6035: } else {
6036: $result.=&escape($hashref->{$_}).'&';
6037: }
6038: }
6039: $result=~s/\&$//;
6040: $result .= '__END_HASH_REF__';
6041: return $result;
6042: }
6043:
6044: # ----------------------------------- POD (plain old documentation, CPAN style)
6045:
6046: =head1 NAME
6047:
6048: lond - "LON Daemon" Server (port "LOND" 5663)
6049:
6050: =head1 SYNOPSIS
6051:
6052: Usage: B<lond>
6053:
6054: Should only be run as user=www. This is a command-line script which
6055: is invoked by B<loncron>. There is no expectation that a typical user
6056: will manually start B<lond> from the command-line. (In other words,
6057: DO NOT START B<lond> YOURSELF.)
6058:
6059: =head1 DESCRIPTION
6060:
6061: There are two characteristics associated with the running of B<lond>,
6062: PROCESS MANAGEMENT (starting, stopping, handling child processes)
6063: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
6064: subscriptions, etc). These are described in two large
6065: sections below.
6066:
6067: B<PROCESS MANAGEMENT>
6068:
6069: Preforker - server who forks first. Runs as a daemon. HUPs.
6070: Uses IDEA encryption
6071:
6072: B<lond> forks off children processes that correspond to the other servers
6073: in the network. Management of these processes can be done at the
6074: parent process level or the child process level.
6075:
6076: B<logs/lond.log> is the location of log messages.
6077:
6078: The process management is now explained in terms of linux shell commands,
6079: subroutines internal to this code, and signal assignments:
6080:
6081: =over 4
6082:
6083: =item *
6084:
6085: PID is stored in B<logs/lond.pid>
6086:
6087: This is the process id number of the parent B<lond> process.
6088:
6089: =item *
6090:
6091: SIGTERM and SIGINT
6092:
6093: Parent signal assignment:
6094: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
6095:
6096: Child signal assignment:
6097: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
6098: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
6099: to restart a new child.)
6100:
6101: Command-line invocations:
6102: B<kill> B<-s> SIGTERM I<PID>
6103: B<kill> B<-s> SIGINT I<PID>
6104:
6105: Subroutine B<HUNTSMAN>:
6106: This is only invoked for the B<lond> parent I<PID>.
6107: This kills all the children, and then the parent.
6108: The B<lonc.pid> file is cleared.
6109:
6110: =item *
6111:
6112: SIGHUP
6113:
6114: Current bug:
6115: This signal can only be processed the first time
6116: on the parent process. Subsequent SIGHUP signals
6117: have no effect.
6118:
6119: Parent signal assignment:
6120: $SIG{HUP} = \&HUPSMAN;
6121:
6122: Child signal assignment:
6123: none (nothing happens)
6124:
6125: Command-line invocations:
6126: B<kill> B<-s> SIGHUP I<PID>
6127:
6128: Subroutine B<HUPSMAN>:
6129: This is only invoked for the B<lond> parent I<PID>,
6130: This kills all the children, and then the parent.
6131: The B<lond.pid> file is cleared.
6132:
6133: =item *
6134:
6135: SIGUSR1
6136:
6137: Parent signal assignment:
6138: $SIG{USR1} = \&USRMAN;
6139:
6140: Child signal assignment:
6141: $SIG{USR1}= \&logstatus;
6142:
6143: Command-line invocations:
6144: B<kill> B<-s> SIGUSR1 I<PID>
6145:
6146: Subroutine B<USRMAN>:
6147: When invoked for the B<lond> parent I<PID>,
6148: SIGUSR1 is sent to all the children, and the status of
6149: each connection is logged.
6150:
6151: =item *
6152:
6153: SIGUSR2
6154:
6155: Parent Signal assignment:
6156: $SIG{USR2} = \&UpdateHosts
6157:
6158: Child signal assignment:
6159: NONE
6160:
6161:
6162: =item *
6163:
6164: SIGCHLD
6165:
6166: Parent signal assignment:
6167: $SIG{CHLD} = \&REAPER;
6168:
6169: Child signal assignment:
6170: none
6171:
6172: Command-line invocations:
6173: B<kill> B<-s> SIGCHLD I<PID>
6174:
6175: Subroutine B<REAPER>:
6176: This is only invoked for the B<lond> parent I<PID>.
6177: Information pertaining to the child is removed.
6178: The socket port is cleaned up.
6179:
6180: =back
6181:
6182: B<SERVER-SIDE ACTIVITIES>
6183:
6184: Server-side information can be accepted in an encrypted or non-encrypted
6185: method.
6186:
6187: =over 4
6188:
6189: =item ping
6190:
6191: Query a client in the hosts.tab table; "Are you there?"
6192:
6193: =item pong
6194:
6195: Respond to a ping query.
6196:
6197: =item ekey
6198:
6199: Read in encrypted key, make cipher. Respond with a buildkey.
6200:
6201: =item load
6202:
6203: Respond with CPU load based on a computation upon /proc/loadavg.
6204:
6205: =item currentauth
6206:
6207: Reply with current authentication information (only over an
6208: encrypted channel).
6209:
6210: =item auth
6211:
6212: Only over an encrypted channel, reply as to whether a user's
6213: authentication information can be validated.
6214:
6215: =item passwd
6216:
6217: Allow for a password to be set.
6218:
6219: =item makeuser
6220:
6221: Make a user.
6222:
6223: =item passwd
6224:
6225: Allow for authentication mechanism and password to be changed.
6226:
6227: =item home
6228:
6229: Respond to a question "are you the home for a given user?"
6230:
6231: =item update
6232:
6233: Update contents of a subscribed resource.
6234:
6235: =item unsubscribe
6236:
6237: The server is unsubscribing from a resource.
6238:
6239: =item subscribe
6240:
6241: The server is subscribing to a resource.
6242:
6243: =item log
6244:
6245: Place in B<logs/lond.log>
6246:
6247: =item put
6248:
6249: stores hash in namespace
6250:
6251: =item rolesputy
6252:
6253: put a role into a user's environment
6254:
6255: =item get
6256:
6257: returns hash with keys from array
6258: reference filled in from namespace
6259:
6260: =item eget
6261:
6262: returns hash with keys from array
6263: reference filled in from namesp (encrypts the return communication)
6264:
6265: =item rolesget
6266:
6267: get a role from a user's environment
6268:
6269: =item del
6270:
6271: deletes keys out of array from namespace
6272:
6273: =item keys
6274:
6275: returns namespace keys
6276:
6277: =item dump
6278:
6279: dumps the complete (or key matching regexp) namespace into a hash
6280:
6281: =item store
6282:
6283: stores hash permanently
6284: for this url; hashref needs to be given and should be a \%hashname; the
6285: remaining args aren't required and if they aren't passed or are '' they will
6286: be derived from the ENV
6287:
6288: =item restore
6289:
6290: returns a hash for a given url
6291:
6292: =item querysend
6293:
6294: Tells client about the lonsql process that has been launched in response
6295: to a sent query.
6296:
6297: =item queryreply
6298:
6299: Accept information from lonsql and make appropriate storage in temporary
6300: file space.
6301:
6302: =item idput
6303:
6304: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
6305: for each student, defined perhaps by the institutional Registrar.)
6306:
6307: =item idget
6308:
6309: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
6310: for each student, defined perhaps by the institutional Registrar.)
6311:
6312: =item tmpput
6313:
6314: Accept and store information in temporary space.
6315:
6316: =item tmpget
6317:
6318: Send along temporarily stored information.
6319:
6320: =item ls
6321:
6322: List part of a user's directory.
6323:
6324: =item pushtable
6325:
6326: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
6327: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
6328: must be restored manually in case of a problem with the new table file.
6329: pushtable requires that the request be encrypted and validated via
6330: ValidateManager. The form of the command is:
6331: enc:pushtable tablename <tablecontents> \n
6332: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
6333: cleartext newline.
6334:
6335: =item Hanging up (exit or init)
6336:
6337: What to do when a client tells the server that they (the client)
6338: are leaving the network.
6339:
6340: =item unknown command
6341:
6342: If B<lond> is sent an unknown command (not in the list above),
6343: it replys to the client "unknown_cmd".
6344:
6345:
6346: =item UNKNOWN CLIENT
6347:
6348: If the anti-spoofing algorithm cannot verify the client,
6349: the client is rejected (with a "refused" message sent
6350: to the client, and the connection is closed.
6351:
6352: =back
6353:
6354: =head1 PREREQUISITES
6355:
6356: IO::Socket
6357: IO::File
6358: Apache::File
6359: Symbol
6360: POSIX
6361: Crypt::IDEA
6362: LWP::UserAgent()
6363: GDBM_File
6364: Authen::Krb4
6365: Authen::Krb5
6366:
6367: =head1 COREQUISITES
6368:
6369: =head1 OSNAMES
6370:
6371: linux
6372:
6373: =head1 SCRIPT CATEGORIES
6374:
6375: Server/Process
6376:
6377: =cut
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