1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.325 2006/05/11 17:53:22 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;
35: use LONCAPA::Configuration;
36:
37: use IO::Socket;
38: use IO::File;
39: #use Apache::File;
40: use Symbol;
41: use POSIX;
42: use Crypt::IDEA;
43: use LWP::UserAgent();
44: use GDBM_File;
45: use Authen::Krb4;
46: use Authen::Krb5;
47: use lib '/home/httpd/lib/perl/';
48: use localauth;
49: use localenroll;
50: use localstudentphoto;
51: use File::Copy;
52: use File::Find;
53: use LONCAPA::ConfigFileEdit;
54: use LONCAPA::lonlocal;
55: use LONCAPA::lonssl;
56: use Fcntl qw(:flock);
57: use Symbol;
58:
59: my $DEBUG = 0; # Non zero to enable debug log entries.
60:
61: my $status='';
62: my $lastlog='';
63: my $lond_max_wait_time = 13;
64:
65: my $VERSION='$Revision: 1.325 $'; #' stupid emacs
66: my $remoteVERSION;
67: my $currenthostid="default";
68: my $currentdomainid;
69:
70: my $client;
71: my $clientip; # IP address of client.
72: my $clientname; # LonCAPA name of client.
73:
74: my $server;
75: my $thisserver; # DNS of us.
76:
77: my $keymode;
78:
79: my $cipher; # Cipher key negotiated with client
80: my $tmpsnum = 0; # Id of tmpputs.
81:
82: #
83: # Connection type is:
84: # client - All client actions are allowed
85: # manager - only management functions allowed.
86: # both - Both management and client actions are allowed
87: #
88:
89: my $ConnectionType;
90:
91: my %hostid; # ID's for hosts in cluster by ip.
92: my %hostdom; # LonCAPA domain for hosts in cluster.
93: my %hostname; # DNSname -> ID's mapping.
94: my %hostip; # IPs for hosts in cluster.
95: my %hostdns; # ID's of hosts looked up by DNS name.
96:
97: my %managers; # Ip -> manager names
98:
99: my %perlvar; # Will have the apache conf defined perl vars.
100:
101: #
102: # The hash below is used for command dispatching, and is therefore keyed on the request keyword.
103: # Each element of the hash contains a reference to an array that contains:
104: # A reference to a sub that executes the request corresponding to the keyword.
105: # A flag that is true if the request must be encoded to be acceptable.
106: # A mask with bits as follows:
107: # CLIENT_OK - Set when the function is allowed by ordinary clients
108: # MANAGER_OK - Set when the function is allowed to manager clients.
109: #
110: my $CLIENT_OK = 1;
111: my $MANAGER_OK = 2;
112: my %Dispatcher;
113:
114:
115: #
116: # The array below are password error strings."
117: #
118: my $lastpwderror = 13; # Largest error number from lcpasswd.
119: my @passwderrors = ("ok",
120: "pwchange_failure - lcpasswd must be run as user 'www'",
121: "pwchange_failure - lcpasswd got incorrect number of arguments",
122: "pwchange_failure - lcpasswd did not get the right nubmer of input text lines",
123: "pwchange_failure - lcpasswd too many simultaneous pwd changes in progress",
124: "pwchange_failure - lcpasswd User does not exist.",
125: "pwchange_failure - lcpasswd Incorrect current passwd",
126: "pwchange_failure - lcpasswd Unable to su to root.",
127: "pwchange_failure - lcpasswd Cannot set new passwd.",
128: "pwchange_failure - lcpasswd Username has invalid characters",
129: "pwchange_failure - lcpasswd Invalid characters in password",
130: "pwchange_failure - lcpasswd User already exists",
131: "pwchange_failure - lcpasswd Something went wrong with user addition.",
132: "pwchange_failure - lcpasswd Password mismatch",
133: "pwchange_failure - lcpasswd Error filename is invalid");
134:
135:
136: # The array below are lcuseradd error strings.:
137:
138: my $lastadderror = 13;
139: my @adderrors = ("ok",
140: "User ID mismatch, lcuseradd must run as user www",
141: "lcuseradd Incorrect number of command line parameters must be 3",
142: "lcuseradd Incorrect number of stdinput lines, must be 3",
143: "lcuseradd Too many other simultaneous pwd changes in progress",
144: "lcuseradd User does not exist",
145: "lcuseradd Unable to make www member of users's group",
146: "lcuseradd Unable to su to root",
147: "lcuseradd Unable to set password",
148: "lcuseradd Usrname has invalid characters",
149: "lcuseradd Password has an invalid character",
150: "lcuseradd User already exists",
151: "lcuseradd Could not add user.",
152: "lcuseradd Password mismatch");
153:
154:
155:
156: #
157: # Statistics that are maintained and dislayed in the status line.
158: #
159: my $Transactions = 0; # Number of attempted transactions.
160: my $Failures = 0; # Number of transcations failed.
161:
162: # ResetStatistics:
163: # Resets the statistics counters:
164: #
165: sub ResetStatistics {
166: $Transactions = 0;
167: $Failures = 0;
168: }
169:
170: #------------------------------------------------------------------------
171: #
172: # LocalConnection
173: # Completes the formation of a locally authenticated connection.
174: # This function will ensure that the 'remote' client is really the
175: # local host. If not, the connection is closed, and the function fails.
176: # If so, initcmd is parsed for the name of a file containing the
177: # IDEA session key. The fie is opened, read, deleted and the session
178: # key returned to the caller.
179: #
180: # Parameters:
181: # $Socket - Socket open on client.
182: # $initcmd - The full text of the init command.
183: #
184: # Implicit inputs:
185: # $thisserver - Our DNS name.
186: #
187: # Returns:
188: # IDEA session key on success.
189: # undef on failure.
190: #
191: sub LocalConnection {
192: my ($Socket, $initcmd) = @_;
193: Debug("Attempting local connection: $initcmd client: $clientip me: $thisserver");
194: if($clientip ne "127.0.0.1") {
195: &logthis('<font color="red"> LocalConnection rejecting non local: '
196: ."$clientip ne $thisserver </font>");
197: close $Socket;
198: return undef;
199: } else {
200: chomp($initcmd); # Get rid of \n in filename.
201: my ($init, $type, $name) = split(/:/, $initcmd);
202: Debug(" Init command: $init $type $name ");
203:
204: # Require that $init = init, and $type = local: Otherwise
205: # the caller is insane:
206:
207: if(($init ne "init") && ($type ne "local")) {
208: &logthis('<font color = "red"> LocalConnection: caller is insane! '
209: ."init = $init, and type = $type </font>");
210: close($Socket);;
211: return undef;
212:
213: }
214: # Now get the key filename:
215:
216: my $IDEAKey = lonlocal::ReadKeyFile($name);
217: return $IDEAKey;
218: }
219: }
220: #------------------------------------------------------------------------------
221: #
222: # SSLConnection
223: # Completes the formation of an ssh authenticated connection. The
224: # socket is promoted to an ssl socket. If this promotion and the associated
225: # certificate exchange are successful, the IDEA key is generated and sent
226: # to the remote peer via the SSL tunnel. The IDEA key is also returned to
227: # the caller after the SSL tunnel is torn down.
228: #
229: # Parameters:
230: # Name Type Purpose
231: # $Socket IO::Socket::INET Plaintext socket.
232: #
233: # Returns:
234: # IDEA key on success.
235: # undef on failure.
236: #
237: sub SSLConnection {
238: my $Socket = shift;
239:
240: Debug("SSLConnection: ");
241: my $KeyFile = lonssl::KeyFile();
242: if(!$KeyFile) {
243: my $err = lonssl::LastError();
244: &logthis("<font color=\"red\"> CRITICAL"
245: ."Can't get key file $err </font>");
246: return undef;
247: }
248: my ($CACertificate,
249: $Certificate) = lonssl::CertificateFile();
250:
251:
252: # If any of the key, certificate or certificate authority
253: # certificate filenames are not defined, this can't work.
254:
255: if((!$Certificate) || (!$CACertificate)) {
256: my $err = lonssl::LastError();
257: &logthis("<font color=\"red\"> CRITICAL"
258: ."Can't get certificates: $err </font>");
259:
260: return undef;
261: }
262: Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
263:
264: # Indicate to our peer that we can procede with
265: # a transition to ssl authentication:
266:
267: print $Socket "ok:ssl\n";
268:
269: Debug("Approving promotion -> ssl");
270: # And do so:
271:
272: my $SSLSocket = lonssl::PromoteServerSocket($Socket,
273: $CACertificate,
274: $Certificate,
275: $KeyFile);
276: if(! ($SSLSocket) ) { # SSL socket promotion failed.
277: my $err = lonssl::LastError();
278: &logthis("<font color=\"red\"> CRITICAL "
279: ."SSL Socket promotion failed: $err </font>");
280: return undef;
281: }
282: Debug("SSL Promotion successful");
283:
284: #
285: # The only thing we'll use the socket for is to send the IDEA key
286: # to the peer:
287:
288: my $Key = lonlocal::CreateCipherKey();
289: print $SSLSocket "$Key\n";
290:
291: lonssl::Close($SSLSocket);
292:
293: Debug("Key exchange complete: $Key");
294:
295: return $Key;
296: }
297: #
298: # InsecureConnection:
299: # If insecure connections are allowd,
300: # exchange a challenge with the client to 'validate' the
301: # client (not really, but that's the protocol):
302: # We produce a challenge string that's sent to the client.
303: # The client must then echo the challenge verbatim to us.
304: #
305: # Parameter:
306: # Socket - Socket open on the client.
307: # Returns:
308: # 1 - success.
309: # 0 - failure (e.g.mismatch or insecure not allowed).
310: #
311: sub InsecureConnection {
312: my $Socket = shift;
313:
314: # Don't even start if insecure connections are not allowed.
315:
316: if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
317: return 0;
318: }
319:
320: # Fabricate a challenge string and send it..
321:
322: my $challenge = "$$".time; # pid + time.
323: print $Socket "$challenge\n";
324: &status("Waiting for challenge reply");
325:
326: my $answer = <$Socket>;
327: $answer =~s/\W//g;
328: if($challenge eq $answer) {
329: return 1;
330: } else {
331: logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
332: &status("No challenge reqply");
333: return 0;
334: }
335:
336:
337: }
338: #
339: # Safely execute a command (as long as it's not a shel command and doesn
340: # not require/rely on shell escapes. The function operates by doing a
341: # a pipe based fork and capturing stdout and stderr from the pipe.
342: #
343: # Formal Parameters:
344: # $line - A line of text to be executed as a command.
345: # Returns:
346: # The output from that command. If the output is multiline the caller
347: # must know how to split up the output.
348: #
349: #
350: sub execute_command {
351: my ($line) = @_;
352: my @words = split(/\s/, $line); # Bust the command up into words.
353: my $output = "";
354:
355: my $pid = open(CHILD, "-|");
356:
357: if($pid) { # Parent process
358: Debug("In parent process for execute_command");
359: my @data = <CHILD>; # Read the child's outupt...
360: close CHILD;
361: foreach my $output_line (@data) {
362: Debug("Adding $output_line");
363: $output .= $output_line; # Presumably has a \n on it.
364: }
365:
366: } else { # Child process
367: close (STDERR);
368: open (STDERR, ">&STDOUT");# Combine stderr, and stdout...
369: exec(@words); # won't return.
370: }
371: return $output;
372: }
373:
374:
375: # GetCertificate: Given a transaction that requires a certificate,
376: # this function will extract the certificate from the transaction
377: # request. Note that at this point, the only concept of a certificate
378: # is the hostname to which we are connected.
379: #
380: # Parameter:
381: # request - The request sent by our client (this parameterization may
382: # need to change when we really use a certificate granting
383: # authority.
384: #
385: sub GetCertificate {
386: my $request = shift;
387:
388: return $clientip;
389: }
390:
391: #
392: # Return true if client is a manager.
393: #
394: sub isManager {
395: return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
396: }
397: #
398: # Return tru if client can do client functions
399: #
400: sub isClient {
401: return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
402: }
403:
404:
405: #
406: # ReadManagerTable: Reads in the current manager table. For now this is
407: # done on each manager authentication because:
408: # - These authentications are not frequent
409: # - This allows dynamic changes to the manager table
410: # without the need to signal to the lond.
411: #
412: sub ReadManagerTable {
413:
414: # Clean out the old table first..
415:
416: foreach my $key (keys %managers) {
417: delete $managers{$key};
418: }
419:
420: my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
421: if (!open (MANAGERS, $tablename)) {
422: logthis('<font color="red">No manager table. Nobody can manage!!</font>');
423: return;
424: }
425: while(my $host = <MANAGERS>) {
426: chomp($host);
427: if ($host =~ "^#") { # Comment line.
428: next;
429: }
430: if (!defined $hostip{$host}) { # This is a non cluster member
431: # The entry is of the form:
432: # cluname:hostname
433: # cluname - A 'cluster hostname' is needed in order to negotiate
434: # the host key.
435: # hostname- The dns name of the host.
436: #
437: my($cluname, $dnsname) = split(/:/, $host);
438:
439: my $ip = gethostbyname($dnsname);
440: if(defined($ip)) { # bad names don't deserve entry.
441: my $hostip = inet_ntoa($ip);
442: $managers{$hostip} = $cluname;
443: logthis('<font color="green"> registering manager '.
444: "$dnsname as $cluname with $hostip </font>\n");
445: }
446: } else {
447: logthis('<font color="green"> existing host'." $host</font>\n");
448: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber
449: }
450: }
451: }
452:
453: #
454: # ValidManager: Determines if a given certificate represents a valid manager.
455: # in this primitive implementation, the 'certificate' is
456: # just the connecting loncapa client name. This is checked
457: # against a valid client list in the configuration.
458: #
459: #
460: sub ValidManager {
461: my $certificate = shift;
462:
463: return isManager;
464: }
465: #
466: # CopyFile: Called as part of the process of installing a
467: # new configuration file. This function copies an existing
468: # file to a backup file.
469: # Parameters:
470: # oldfile - Name of the file to backup.
471: # newfile - Name of the backup file.
472: # Return:
473: # 0 - Failure (errno has failure reason).
474: # 1 - Success.
475: #
476: sub CopyFile {
477:
478: my ($oldfile, $newfile) = @_;
479:
480: if (! copy($oldfile,$newfile)) {
481: return 0;
482: }
483: chmod(0660, $newfile);
484: return 1;
485: }
486: #
487: # Host files are passed out with externally visible host IPs.
488: # If, for example, we are behind a fire-wall or NAT host, our
489: # internally visible IP may be different than the externally
490: # visible IP. Therefore, we always adjust the contents of the
491: # host file so that the entry for ME is the IP that we believe
492: # we have. At present, this is defined as the entry that
493: # DNS has for us. If by some chance we are not able to get a
494: # DNS translation for us, then we assume that the host.tab file
495: # is correct.
496: # BUGBUGBUG - in the future, we really should see if we can
497: # easily query the interface(s) instead.
498: # Parameter(s):
499: # contents - The contents of the host.tab to check.
500: # Returns:
501: # newcontents - The adjusted contents.
502: #
503: #
504: sub AdjustHostContents {
505: my $contents = shift;
506: my $adjusted;
507: my $me = $perlvar{'lonHostID'};
508:
509: foreach my $line (split(/\n/,$contents)) {
510: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
511: chomp($line);
512: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
513: if ($id eq $me) {
514: my $ip = gethostbyname($name);
515: my $ipnew = inet_ntoa($ip);
516: $ip = $ipnew;
517: # Reconstruct the host line and append to adjusted:
518:
519: my $newline = "$id:$domain:$role:$name:$ip";
520: if($maxcon ne "") { # Not all hosts have loncnew tuning params
521: $newline .= ":$maxcon:$idleto:$mincon";
522: }
523: $adjusted .= $newline."\n";
524:
525: } else { # Not me, pass unmodified.
526: $adjusted .= $line."\n";
527: }
528: } else { # Blank or comment never re-written.
529: $adjusted .= $line."\n"; # Pass blanks and comments as is.
530: }
531: }
532: return $adjusted;
533: }
534: #
535: # InstallFile: Called to install an administrative file:
536: # - The file is created with <name>.tmp
537: # - The <name>.tmp file is then mv'd to <name>
538: # This lugubrious procedure is done to ensure that we are never without
539: # a valid, even if dated, version of the file regardless of who crashes
540: # and when the crash occurs.
541: #
542: # Parameters:
543: # Name of the file
544: # File Contents.
545: # Return:
546: # nonzero - success.
547: # 0 - failure and $! has an errno.
548: #
549: sub InstallFile {
550:
551: my ($Filename, $Contents) = @_;
552: my $TempFile = $Filename.".tmp";
553:
554: # Open the file for write:
555:
556: my $fh = IO::File->new("> $TempFile"); # Write to temp.
557: if(!(defined $fh)) {
558: &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
559: return 0;
560: }
561: # write the contents of the file:
562:
563: print $fh ($Contents);
564: $fh->close; # In case we ever have a filesystem w. locking
565:
566: chmod(0660, $TempFile);
567:
568: # Now we can move install the file in position.
569:
570: move($TempFile, $Filename);
571:
572: return 1;
573: }
574:
575:
576: #
577: # ConfigFileFromSelector: converts a configuration file selector
578: # (one of host or domain at this point) into a
579: # configuration file pathname.
580: #
581: # Parameters:
582: # selector - Configuration file selector.
583: # Returns:
584: # Full path to the file or undef if the selector is invalid.
585: #
586: sub ConfigFileFromSelector {
587: my $selector = shift;
588: my $tablefile;
589:
590: my $tabledir = $perlvar{'lonTabDir'}.'/';
591: if ($selector eq "hosts") {
592: $tablefile = $tabledir."hosts.tab";
593: } elsif ($selector eq "domain") {
594: $tablefile = $tabledir."domain.tab";
595: } else {
596: return undef;
597: }
598: return $tablefile;
599:
600: }
601: #
602: # PushFile: Called to do an administrative push of a file.
603: # - Ensure the file being pushed is one we support.
604: # - Backup the old file to <filename.saved>
605: # - Separate the contents of the new file out from the
606: # rest of the request.
607: # - Write the new file.
608: # Parameter:
609: # Request - The entire user request. This consists of a : separated
610: # string pushfile:tablename:contents.
611: # NOTE: The contents may have :'s in it as well making things a bit
612: # more interesting... but not much.
613: # Returns:
614: # String to send to client ("ok" or "refused" if bad file).
615: #
616: sub PushFile {
617: my $request = shift;
618: my ($command, $filename, $contents) = split(":", $request, 3);
619:
620: # At this point in time, pushes for only the following tables are
621: # supported:
622: # hosts.tab ($filename eq host).
623: # domain.tab ($filename eq domain).
624: # Construct the destination filename or reject the request.
625: #
626: # lonManage is supposed to ensure this, however this session could be
627: # part of some elaborate spoof that managed somehow to authenticate.
628: #
629:
630:
631: my $tablefile = ConfigFileFromSelector($filename);
632: if(! (defined $tablefile)) {
633: return "refused";
634: }
635: #
636: # >copy< the old table to the backup table
637: # don't rename in case system crashes/reboots etc. in the time
638: # window between a rename and write.
639: #
640: my $backupfile = $tablefile;
641: $backupfile =~ s/\.tab$/.old/;
642: if(!CopyFile($tablefile, $backupfile)) {
643: &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
644: return "error:$!";
645: }
646: &logthis('<font color="green"> Pushfile: backed up '
647: .$tablefile." to $backupfile</font>");
648:
649: # If the file being pushed is the host file, we adjust the entry for ourself so that the
650: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible
651: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a
652: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
653: # that possibilty.
654:
655: if($filename eq "host") {
656: $contents = AdjustHostContents($contents);
657: }
658:
659: # Install the new file:
660:
661: if(!InstallFile($tablefile, $contents)) {
662: &logthis('<font color="red"> Pushfile: unable to install '
663: .$tablefile." $! </font>");
664: return "error:$!";
665: } else {
666: &logthis('<font color="green"> Installed new '.$tablefile
667: ."</font>");
668:
669: }
670:
671:
672: # Indicate success:
673:
674: return "ok";
675:
676: }
677:
678: #
679: # Called to re-init either lonc or lond.
680: #
681: # Parameters:
682: # request - The full request by the client. This is of the form
683: # reinit:<process>
684: # where <process> is allowed to be either of
685: # lonc or lond
686: #
687: # Returns:
688: # The string to be sent back to the client either:
689: # ok - Everything worked just fine.
690: # error:why - There was a failure and why describes the reason.
691: #
692: #
693: sub ReinitProcess {
694: my $request = shift;
695:
696:
697: # separate the request (reinit) from the process identifier and
698: # validate it producing the name of the .pid file for the process.
699: #
700: #
701: my ($junk, $process) = split(":", $request);
702: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
703: if($process eq 'lonc') {
704: $processpidfile = $processpidfile."lonc.pid";
705: if (!open(PIDFILE, "< $processpidfile")) {
706: return "error:Open failed for $processpidfile";
707: }
708: my $loncpid = <PIDFILE>;
709: close(PIDFILE);
710: logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
711: ."</font>");
712: kill("USR2", $loncpid);
713: } elsif ($process eq 'lond') {
714: logthis('<font color="red"> Reinitializing self (lond) </font>');
715: &UpdateHosts; # Lond is us!!
716: } else {
717: &logthis('<font color="yellow" Invalid reinit request for '.$process
718: ."</font>");
719: return "error:Invalid process identifier $process";
720: }
721: return 'ok';
722: }
723: # Validate a line in a configuration file edit script:
724: # Validation includes:
725: # - Ensuring the command is valid.
726: # - Ensuring the command has sufficient parameters
727: # Parameters:
728: # scriptline - A line to validate (\n has been stripped for what it's worth).
729: #
730: # Return:
731: # 0 - Invalid scriptline.
732: # 1 - Valid scriptline
733: # NOTE:
734: # Only the command syntax is checked, not the executability of the
735: # command.
736: #
737: sub isValidEditCommand {
738: my $scriptline = shift;
739:
740: # Line elements are pipe separated:
741:
742: my ($command, $key, $newline) = split(/\|/, $scriptline);
743: &logthis('<font color="green"> isValideditCommand checking: '.
744: "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
745:
746: if ($command eq "delete") {
747: #
748: # key with no newline.
749: #
750: if( ($key eq "") || ($newline ne "")) {
751: return 0; # Must have key but no newline.
752: } else {
753: return 1; # Valid syntax.
754: }
755: } elsif ($command eq "replace") {
756: #
757: # key and newline:
758: #
759: if (($key eq "") || ($newline eq "")) {
760: return 0;
761: } else {
762: return 1;
763: }
764: } elsif ($command eq "append") {
765: if (($key ne "") && ($newline eq "")) {
766: return 1;
767: } else {
768: return 0;
769: }
770: } else {
771: return 0; # Invalid command.
772: }
773: return 0; # Should not get here!!!
774: }
775: #
776: # ApplyEdit - Applies an edit command to a line in a configuration
777: # file. It is the caller's responsiblity to validate the
778: # edit line.
779: # Parameters:
780: # $directive - A single edit directive to apply.
781: # Edit directives are of the form:
782: # append|newline - Appends a new line to the file.
783: # replace|key|newline - Replaces the line with key value 'key'
784: # delete|key - Deletes the line with key value 'key'.
785: # $editor - A config file editor object that contains the
786: # file being edited.
787: #
788: sub ApplyEdit {
789:
790: my ($directive, $editor) = @_;
791:
792: # Break the directive down into its command and its parameters
793: # (at most two at this point. The meaning of the parameters, if in fact
794: # they exist depends on the command).
795:
796: my ($command, $p1, $p2) = split(/\|/, $directive);
797:
798: if($command eq "append") {
799: $editor->Append($p1); # p1 - key p2 null.
800: } elsif ($command eq "replace") {
801: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline.
802: } elsif ($command eq "delete") {
803: $editor->DeleteLine($p1); # p1 - key p2 null.
804: } else { # Should not get here!!!
805: die "Invalid command given to ApplyEdit $command"
806: }
807: }
808: #
809: # AdjustOurHost:
810: # Adjusts a host file stored in a configuration file editor object
811: # for the true IP address of this host. This is necessary for hosts
812: # that live behind a firewall.
813: # Those hosts have a publicly distributed IP of the firewall, but
814: # internally must use their actual IP. We assume that a given
815: # host only has a single IP interface for now.
816: # Formal Parameters:
817: # editor - The configuration file editor to adjust. This
818: # editor is assumed to contain a hosts.tab file.
819: # Strategy:
820: # - Figure out our hostname.
821: # - Lookup the entry for this host.
822: # - Modify the line to contain our IP
823: # - Do a replace for this host.
824: sub AdjustOurHost {
825: my $editor = shift;
826:
827: # figure out who I am.
828:
829: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname.
830:
831: # Get my host file entry.
832:
833: my $ConfigLine = $editor->Find($myHostName);
834: if(! (defined $ConfigLine)) {
835: die "AdjustOurHost - no entry for me in hosts file $myHostName";
836: }
837: # figure out my IP:
838: # Use the config line to get my hostname.
839: # Use gethostbyname to translate that into an IP address.
840: #
841: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
842: my $BinaryIp = gethostbyname($name);
843: my $ip = inet_ntoa($ip);
844: #
845: # Reassemble the config line from the elements in the list.
846: # Note that if the loncnew items were not present before, they will
847: # be now even if they would be empty
848: #
849: my $newConfigLine = $id;
850: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
851: $newConfigLine .= ":".$item;
852: }
853: # Replace the line:
854:
855: $editor->ReplaceLine($id, $newConfigLine);
856:
857: }
858: #
859: # ReplaceConfigFile:
860: # Replaces a configuration file with the contents of a
861: # configuration file editor object.
862: # This is done by:
863: # - Copying the target file to <filename>.old
864: # - Writing the new file to <filename>.tmp
865: # - Moving <filename.tmp> -> <filename>
866: # This laborious process ensures that the system is never without
867: # a configuration file that's at least valid (even if the contents
868: # may be dated).
869: # Parameters:
870: # filename - Name of the file to modify... this is a full path.
871: # editor - Editor containing the file.
872: #
873: sub ReplaceConfigFile {
874:
875: my ($filename, $editor) = @_;
876:
877: CopyFile ($filename, $filename.".old");
878:
879: my $contents = $editor->Get(); # Get the contents of the file.
880:
881: InstallFile($filename, $contents);
882: }
883: #
884: #
885: # Called to edit a configuration table file
886: # Parameters:
887: # request - The entire command/request sent by lonc or lonManage
888: # Return:
889: # The reply to send to the client.
890: #
891: sub EditFile {
892: my $request = shift;
893:
894: # Split the command into it's pieces: edit:filetype:script
895:
896: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script
897:
898: # Check the pre-coditions for success:
899:
900: if($request != "edit") { # Something is amiss afoot alack.
901: return "error:edit request detected, but request != 'edit'\n";
902: }
903: if( ($filetype ne "hosts") &&
904: ($filetype ne "domain")) {
905: return "error:edit requested with invalid file specifier: $filetype \n";
906: }
907:
908: # Split the edit script and check it's validity.
909:
910: my @scriptlines = split(/\n/, $script); # one line per element.
911: my $linecount = scalar(@scriptlines);
912: for(my $i = 0; $i < $linecount; $i++) {
913: chomp($scriptlines[$i]);
914: if(!isValidEditCommand($scriptlines[$i])) {
915: return "error:edit with bad script line: '$scriptlines[$i]' \n";
916: }
917: }
918:
919: # Execute the edit operation.
920: # - Create a config file editor for the appropriate file and
921: # - execute each command in the script:
922: #
923: my $configfile = ConfigFileFromSelector($filetype);
924: if (!(defined $configfile)) {
925: return "refused\n";
926: }
927: my $editor = ConfigFileEdit->new($configfile);
928:
929: for (my $i = 0; $i < $linecount; $i++) {
930: ApplyEdit($scriptlines[$i], $editor);
931: }
932: # If the file is the host file, ensure that our host is
933: # adjusted to have our ip:
934: #
935: if($filetype eq "host") {
936: AdjustOurHost($editor);
937: }
938: # Finally replace the current file with our file.
939: #
940: ReplaceConfigFile($configfile, $editor);
941:
942: return "ok\n";
943: }
944:
945: #---------------------------------------------------------------
946: #
947: # Manipulation of hash based databases (factoring out common code
948: # for later use as we refactor.
949: #
950: # Ties a domain level resource file to a hash.
951: # If requested a history entry is created in the associated hist file.
952: #
953: # Parameters:
954: # domain - Name of the domain in which the resource file lives.
955: # namespace - Name of the hash within that domain.
956: # how - How to tie the hash (e.g. GDBM_WRCREAT()).
957: # loghead - Optional parameter, if present a log entry is created
958: # in the associated history file and this is the first part
959: # of that entry.
960: # logtail - Goes along with loghead, The actual logentry is of the
961: # form $loghead:<timestamp>:logtail.
962: # Returns:
963: # Reference to a hash bound to the db file or alternatively undef
964: # if the tie failed.
965: #
966: sub tie_domain_hash {
967: my ($domain,$namespace,$how,$loghead,$logtail) = @_;
968:
969: # Filter out any whitespace in the domain name:
970:
971: $domain =~ s/\W//g;
972:
973: # We have enough to go on to tie the hash:
974:
975: my $user_top_dir = $perlvar{'lonUsersDir'};
976: my $domain_dir = $user_top_dir."/$domain";
977: my $resource_file = $domain_dir."/$namespace";
978: return &_locking_hash_tie($resource_file,$namespace,$how,$loghead,$logtail);
979: }
980:
981: sub untie_domain_hash {
982: return &_locking_hash_untie(@_);
983: }
984: #
985: # Ties a user's resource file to a hash.
986: # If necessary, an appropriate history
987: # log file entry is made as well.
988: # This sub factors out common code from the subs that manipulate
989: # the various gdbm files that keep keyword value pairs.
990: # Parameters:
991: # domain - Name of the domain the user is in.
992: # user - Name of the 'current user'.
993: # namespace - Namespace representing the file to tie.
994: # how - What the tie is done to (e.g. GDBM_WRCREAT().
995: # loghead - Optional first part of log entry if there may be a
996: # history file.
997: # what - Optional tail of log entry if there may be a history
998: # file.
999: # Returns:
1000: # hash to which the database is tied. It's up to the caller to untie.
1001: # undef if the has could not be tied.
1002: #
1003: sub tie_user_hash {
1004: my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
1005:
1006: $namespace=~s/\//\_/g; # / -> _
1007: $namespace=~s/\W//g; # whitespace eliminated.
1008: my $proname = propath($domain, $user);
1009:
1010: my $file_prefix="$proname/$namespace";
1011: return &_locking_hash_tie($file_prefix,$namespace,$how,$loghead,$what);
1012: }
1013:
1014: sub untie_user_hash {
1015: return &_locking_hash_untie(@_);
1016: }
1017:
1018: # internal routines that handle the actual tieing and untieing process
1019:
1020: sub _do_hash_tie {
1021: my ($file_prefix,$namespace,$how,$loghead,$what) = @_;
1022: my %hash;
1023: if(tie(%hash, 'GDBM_File', "$file_prefix.db", $how, 0640)) {
1024: # If this is a namespace for which a history is kept,
1025: # make the history log entry:
1026: if (($namespace !~/^nohist\_/) && (defined($loghead))) {
1027: my $args = scalar @_;
1028: Debug(" Opening history: $file_prefix $args");
1029: my $hfh = IO::File->new(">>$file_prefix.hist");
1030: if($hfh) {
1031: my $now = time;
1032: print $hfh "$loghead:$now:$what\n";
1033: }
1034: $hfh->close;
1035: }
1036: return \%hash;
1037: } else {
1038: return undef;
1039: }
1040: }
1041:
1042: sub _do_hash_untie {
1043: my ($hashref) = @_;
1044: my $result = untie(%$hashref);
1045: return $result;
1046: }
1047:
1048: {
1049: my $sym;
1050:
1051: sub _locking_hash_tie {
1052: my ($file_prefix,$namespace,$how,$loghead,$what) = @_;
1053:
1054: my ($lock);
1055:
1056: if ($how eq &GDBM_READER()) {
1057: $lock=LOCK_SH;
1058: $how=$how|&GDBM_NOLOCK();
1059: #if the db doesn't exist we can't read from it
1060: if (! -e "$file_prefix.db") {
1061: $! = 2;
1062: return undef;
1063: }
1064: } elsif ($how eq &GDBM_WRCREAT()) {
1065: $lock=LOCK_EX;
1066: $how=$how|&GDBM_NOLOCK();
1067: if (! -e "$file_prefix.db") {
1068: # doesn't exist but we need it to in order to successfully
1069: # lock it so bring it into existance
1070: open(TOUCH,">>$file_prefix.db");
1071: close(TOUCH);
1072: }
1073: } else {
1074: &logthis("Unknown method $how for $file_prefix");
1075: die();
1076: }
1077:
1078: $sym=&Symbol::gensym();
1079: open($sym,"$file_prefix.db");
1080: my $failed=0;
1081: eval {
1082: local $SIG{__DIE__}='DEFAULT';
1083: local $SIG{ALRM}=sub {
1084: $failed=1;
1085: die("failed lock");
1086: };
1087: alarm($lond_max_wait_time);
1088: flock($sym,$lock);
1089: alarm(0);
1090: };
1091: if ($failed) {
1092: $! = 100; # throwing error # 100
1093: return undef;
1094: }
1095: return &_do_hash_tie($file_prefix,$namespace,$how,$loghead,$what);
1096: }
1097:
1098: sub _locking_hash_untie {
1099: my ($hashref) = @_;
1100: my $result = untie(%$hashref);
1101: flock($sym,LOCK_UN);
1102: close($sym);
1103: undef($sym);
1104: return $result;
1105: }
1106: }
1107:
1108: # read_profile
1109: #
1110: # Returns a set of specific entries from a user's profile file.
1111: # this is a utility function that is used by both get_profile_entry and
1112: # get_profile_entry_encrypted.
1113: #
1114: # Parameters:
1115: # udom - Domain in which the user exists.
1116: # uname - User's account name (loncapa account)
1117: # namespace - The profile namespace to open.
1118: # what - A set of & separated queries.
1119: # Returns:
1120: # If all ok: - The string that needs to be shipped back to the user.
1121: # If failure - A string that starts with error: followed by the failure
1122: # reason.. note that this probabyl gets shipped back to the
1123: # user as well.
1124: #
1125: sub read_profile {
1126: my ($udom, $uname, $namespace, $what) = @_;
1127:
1128: my $hashref = &tie_user_hash($udom, $uname, $namespace,
1129: &GDBM_READER());
1130: if ($hashref) {
1131: my @queries=split(/\&/,$what);
1132: my $qresult='';
1133:
1134: for (my $i=0;$i<=$#queries;$i++) {
1135: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string.
1136: }
1137: $qresult=~s/\&$//; # Remove trailing & from last lookup.
1138: if (&untie_user_hash($hashref)) {
1139: return $qresult;
1140: } else {
1141: return "error: ".($!+0)." untie (GDBM) Failed";
1142: }
1143: } else {
1144: if ($!+0 == 2) {
1145: return "error:No such file or GDBM reported bad block error";
1146: } else {
1147: return "error: ".($!+0)." tie (GDBM) Failed";
1148: }
1149: }
1150:
1151: }
1152: #--------------------- Request Handlers --------------------------------------------
1153: #
1154: # By convention each request handler registers itself prior to the sub
1155: # declaration:
1156: #
1157:
1158: #++
1159: #
1160: # Handles ping requests.
1161: # Parameters:
1162: # $cmd - the actual keyword that invoked us.
1163: # $tail - the tail of the request that invoked us.
1164: # $replyfd- File descriptor connected to the client
1165: # Implicit Inputs:
1166: # $currenthostid - Global variable that carries the name of the host we are
1167: # known as.
1168: # Returns:
1169: # 1 - Ok to continue processing.
1170: # 0 - Program should exit.
1171: # Side effects:
1172: # Reply information is sent to the client.
1173: sub ping_handler {
1174: my ($cmd, $tail, $client) = @_;
1175: Debug("$cmd $tail $client .. $currenthostid:");
1176:
1177: Reply( $client,"$currenthostid\n","$cmd:$tail");
1178:
1179: return 1;
1180: }
1181: ®ister_handler("ping", \&ping_handler, 0, 1, 1); # Ping unencoded, client or manager.
1182:
1183: #++
1184: #
1185: # Handles pong requests. Pong replies with our current host id, and
1186: # the results of a ping sent to us via our lonc.
1187: #
1188: # Parameters:
1189: # $cmd - the actual keyword that invoked us.
1190: # $tail - the tail of the request that invoked us.
1191: # $replyfd- File descriptor connected to the client
1192: # Implicit Inputs:
1193: # $currenthostid - Global variable that carries the name of the host we are
1194: # connected to.
1195: # Returns:
1196: # 1 - Ok to continue processing.
1197: # 0 - Program should exit.
1198: # Side effects:
1199: # Reply information is sent to the client.
1200: sub pong_handler {
1201: my ($cmd, $tail, $replyfd) = @_;
1202:
1203: my $reply=&reply("ping",$clientname);
1204: &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
1205: return 1;
1206: }
1207: ®ister_handler("pong", \&pong_handler, 0, 1, 1); # Pong unencoded, client or manager
1208:
1209: #++
1210: # Called to establish an encrypted session key with the remote client.
1211: # Note that with secure lond, in most cases this function is never
1212: # invoked. Instead, the secure session key is established either
1213: # via a local file that's locked down tight and only lives for a short
1214: # time, or via an ssl tunnel...and is generated from a bunch-o-random
1215: # bits from /dev/urandom, rather than the predictable pattern used by
1216: # by this sub. This sub is only used in the old-style insecure
1217: # key negotiation.
1218: # Parameters:
1219: # $cmd - the actual keyword that invoked us.
1220: # $tail - the tail of the request that invoked us.
1221: # $replyfd- File descriptor connected to the client
1222: # Implicit Inputs:
1223: # $currenthostid - Global variable that carries the name of the host
1224: # known as.
1225: # $clientname - Global variable that carries the name of the hsot we're connected to.
1226: # Returns:
1227: # 1 - Ok to continue processing.
1228: # 0 - Program should exit.
1229: # Implicit Outputs:
1230: # Reply information is sent to the client.
1231: # $cipher is set with a reference to a new IDEA encryption object.
1232: #
1233: sub establish_key_handler {
1234: my ($cmd, $tail, $replyfd) = @_;
1235:
1236: my $buildkey=time.$$.int(rand 100000);
1237: $buildkey=~tr/1-6/A-F/;
1238: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
1239: my $key=$currenthostid.$clientname;
1240: $key=~tr/a-z/A-Z/;
1241: $key=~tr/G-P/0-9/;
1242: $key=~tr/Q-Z/0-9/;
1243: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
1244: $key=substr($key,0,32);
1245: my $cipherkey=pack("H32",$key);
1246: $cipher=new IDEA $cipherkey;
1247: &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
1248:
1249: return 1;
1250:
1251: }
1252: ®ister_handler("ekey", \&establish_key_handler, 0, 1,1);
1253:
1254: # Handler for the load command. Returns the current system load average
1255: # to the requestor.
1256: #
1257: # Parameters:
1258: # $cmd - the actual keyword that invoked us.
1259: # $tail - the tail of the request that invoked us.
1260: # $replyfd- File descriptor connected to the client
1261: # Implicit Inputs:
1262: # $currenthostid - Global variable that carries the name of the host
1263: # known as.
1264: # $clientname - Global variable that carries the name of the hsot we're connected to.
1265: # Returns:
1266: # 1 - Ok to continue processing.
1267: # 0 - Program should exit.
1268: # Side effects:
1269: # Reply information is sent to the client.
1270: sub load_handler {
1271: my ($cmd, $tail, $replyfd) = @_;
1272:
1273: # Get the load average from /proc/loadavg and calculate it as a percentage of
1274: # the allowed load limit as set by the perl global variable lonLoadLim
1275:
1276: my $loadavg;
1277: my $loadfile=IO::File->new('/proc/loadavg');
1278:
1279: $loadavg=<$loadfile>;
1280: $loadavg =~ s/\s.*//g; # Extract the first field only.
1281:
1282: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1283:
1284: &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
1285:
1286: return 1;
1287: }
1288: ®ister_handler("load", \&load_handler, 0, 1, 0);
1289:
1290: #
1291: # Process the userload request. This sub returns to the client the current
1292: # user load average. It can be invoked either by clients or managers.
1293: #
1294: # Parameters:
1295: # $cmd - the actual keyword that invoked us.
1296: # $tail - the tail of the request that invoked us.
1297: # $replyfd- File descriptor connected to the client
1298: # Implicit Inputs:
1299: # $currenthostid - Global variable that carries the name of the host
1300: # known as.
1301: # $clientname - Global variable that carries the name of the hsot we're connected to.
1302: # Returns:
1303: # 1 - Ok to continue processing.
1304: # 0 - Program should exit
1305: # Implicit inputs:
1306: # whatever the userload() function requires.
1307: # Implicit outputs:
1308: # the reply is written to the client.
1309: #
1310: sub user_load_handler {
1311: my ($cmd, $tail, $replyfd) = @_;
1312:
1313: my $userloadpercent=&userload();
1314: &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
1315:
1316: return 1;
1317: }
1318: ®ister_handler("userload", \&user_load_handler, 0, 1, 0);
1319:
1320: # Process a request for the authorization type of a user:
1321: # (userauth).
1322: #
1323: # Parameters:
1324: # $cmd - the actual keyword that invoked us.
1325: # $tail - the tail of the request that invoked us.
1326: # $replyfd- File descriptor connected to the client
1327: # Returns:
1328: # 1 - Ok to continue processing.
1329: # 0 - Program should exit
1330: # Implicit outputs:
1331: # The user authorization type is written to the client.
1332: #
1333: sub user_authorization_type {
1334: my ($cmd, $tail, $replyfd) = @_;
1335:
1336: my $userinput = "$cmd:$tail";
1337:
1338: # Pull the domain and username out of the command tail.
1339: # and call get_auth_type to determine the authentication type.
1340:
1341: my ($udom,$uname)=split(/:/,$tail);
1342: my $result = &get_auth_type($udom, $uname);
1343: if($result eq "nouser") {
1344: &Failure( $replyfd, "unknown_user\n", $userinput);
1345: } else {
1346: #
1347: # We only want to pass the second field from get_auth_type
1348: # for ^krb.. otherwise we'll be handing out the encrypted
1349: # password for internals e.g.
1350: #
1351: my ($type,$otherinfo) = split(/:/,$result);
1352: if($type =~ /^krb/) {
1353: $type = $result;
1354: } else {
1355: $type .= ':';
1356: }
1357: &Reply( $replyfd, "$type\n", $userinput);
1358: }
1359:
1360: return 1;
1361: }
1362: ®ister_handler("currentauth", \&user_authorization_type, 1, 1, 0);
1363:
1364: # Process a request by a manager to push a hosts or domain table
1365: # to us. We pick apart the command and pass it on to the subs
1366: # that already exist to do this.
1367: #
1368: # Parameters:
1369: # $cmd - the actual keyword that invoked us.
1370: # $tail - the tail of the request that invoked us.
1371: # $client - File descriptor connected to the client
1372: # Returns:
1373: # 1 - Ok to continue processing.
1374: # 0 - Program should exit
1375: # Implicit Output:
1376: # a reply is written to the client.
1377: sub push_file_handler {
1378: my ($cmd, $tail, $client) = @_;
1379:
1380: my $userinput = "$cmd:$tail";
1381:
1382: # At this time we only know that the IP of our partner is a valid manager
1383: # the code below is a hook to do further authentication (e.g. to resolve
1384: # spoofing).
1385:
1386: my $cert = &GetCertificate($userinput);
1387: if(&ValidManager($cert)) {
1388:
1389: # Now presumably we have the bona fides of both the peer host and the
1390: # process making the request.
1391:
1392: my $reply = &PushFile($userinput);
1393: &Reply($client, "$reply\n", $userinput);
1394:
1395: } else {
1396: &Failure( $client, "refused\n", $userinput);
1397: }
1398: return 1;
1399: }
1400: ®ister_handler("pushfile", \&push_file_handler, 1, 0, 1);
1401:
1402: #
1403: # du - list the disk usuage of a directory recursively.
1404: #
1405: # note: stolen code from the ls file handler
1406: # under construction by Rick Banghart
1407: # .
1408: # Parameters:
1409: # $cmd - The command that dispatched us (du).
1410: # $ududir - The directory path to list... I'm not sure what this
1411: # is relative as things like ls:. return e.g.
1412: # no_such_dir.
1413: # $client - Socket open on the client.
1414: # Returns:
1415: # 1 - indicating that the daemon should not disconnect.
1416: # Side Effects:
1417: # The reply is written to $client.
1418: #
1419: sub du_handler {
1420: my ($cmd, $ududir, $client) = @_;
1421: my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
1422: my $userinput = "$cmd:$ududir";
1423:
1424: if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
1425: &Failure($client,"refused\n","$cmd:$ududir");
1426: return 1;
1427: }
1428: # Since $ududir could have some nasties in it,
1429: # we will require that ududir is a valid
1430: # directory. Just in case someone tries to
1431: # slip us a line like .;(cd /home/httpd rm -rf*)
1432: # etc.
1433: #
1434: if (-d $ududir) {
1435: my $total_size=0;
1436: my $code=sub {
1437: if ($_=~/\.\d+\./) { return;}
1438: if ($_=~/\.meta$/) { return;}
1439: $total_size+=(stat($_))[7];
1440: };
1441: chdir($ududir);
1442: find($code,$ududir);
1443: $total_size=int($total_size/1024);
1444: &Reply($client,"$total_size\n","$cmd:$ududir");
1445: } else {
1446: &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
1447: }
1448: return 1;
1449: }
1450: ®ister_handler("du", \&du_handler, 0, 1, 0);
1451:
1452: #
1453: # The ls_handler routine should be considered obosolete and is retained
1454: # for communication with legacy servers. Please see the ls2_handler.
1455: #
1456: # ls - list the contents of a directory. For each file in the
1457: # selected directory the filename followed by the full output of
1458: # the stat function is returned. The returned info for each
1459: # file are separated by ':'. The stat fields are separated by &'s.
1460: # Parameters:
1461: # $cmd - The command that dispatched us (ls).
1462: # $ulsdir - The directory path to list... I'm not sure what this
1463: # is relative as things like ls:. return e.g.
1464: # no_such_dir.
1465: # $client - Socket open on the client.
1466: # Returns:
1467: # 1 - indicating that the daemon should not disconnect.
1468: # Side Effects:
1469: # The reply is written to $client.
1470: #
1471: sub ls_handler {
1472: # obsoleted by ls2_handler
1473: my ($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)|) { $rights = 1; }
1495: }
1496: }
1497: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
1498: if($obs eq '1') { $ulsout.="&1"; }
1499: else { $ulsout.="&0"; }
1500: if($rights eq '1') { $ulsout.="&1:"; }
1501: else { $ulsout.="&0:"; }
1502: }
1503: closedir(LSDIR);
1504: }
1505: } else {
1506: my @ulsstats=stat($ulsdir);
1507: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1508: }
1509: } else {
1510: $ulsout='no_such_dir';
1511: }
1512: if ($ulsout eq '') { $ulsout='empty'; }
1513: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1514:
1515: return 1;
1516:
1517: }
1518: ®ister_handler("ls", \&ls_handler, 0, 1, 0);
1519:
1520: #
1521: # Please also see the ls_handler, which this routine obosolets.
1522: # ls2_handler differs from ls_handler in that it escapes its return
1523: # values before concatenating them together with ':'s.
1524: #
1525: # ls2 - list the contents of a directory. For each file in the
1526: # selected directory the filename followed by the full output of
1527: # the stat function is returned. The returned info for each
1528: # file are separated by ':'. The stat fields are separated by &'s.
1529: # Parameters:
1530: # $cmd - The command that dispatched us (ls).
1531: # $ulsdir - The directory path to list... I'm not sure what this
1532: # is relative as things like ls:. return e.g.
1533: # no_such_dir.
1534: # $client - Socket open on the client.
1535: # Returns:
1536: # 1 - indicating that the daemon should not disconnect.
1537: # Side Effects:
1538: # The reply is written to $client.
1539: #
1540: sub ls2_handler {
1541: my ($cmd, $ulsdir, $client) = @_;
1542:
1543: my $userinput = "$cmd:$ulsdir";
1544:
1545: my $obs;
1546: my $rights;
1547: my $ulsout='';
1548: my $ulsfn;
1549: if (-e $ulsdir) {
1550: if(-d $ulsdir) {
1551: if (opendir(LSDIR,$ulsdir)) {
1552: while ($ulsfn=readdir(LSDIR)) {
1553: undef($obs);
1554: undef($rights);
1555: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1556: #We do some obsolete checking here
1557: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1558: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1559: my @obsolete=<FILE>;
1560: foreach my $obsolete (@obsolete) {
1561: if($obsolete =~ m/(<obsolete>)(on|1)/) { $obs = 1; }
1562: if($obsolete =~ m|(<copyright>)(default)|) {
1563: $rights = 1;
1564: }
1565: }
1566: }
1567: my $tmp = $ulsfn.'&'.join('&',@ulsstats);
1568: if ($obs eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1569: if ($rights eq '1') { $tmp.="&1"; } else { $tmp.="&0"; }
1570: $ulsout.= &escape($tmp).':';
1571: }
1572: closedir(LSDIR);
1573: }
1574: } else {
1575: my @ulsstats=stat($ulsdir);
1576: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1577: }
1578: } else {
1579: $ulsout='no_such_dir';
1580: }
1581: if ($ulsout eq '') { $ulsout='empty'; }
1582: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1583: return 1;
1584: }
1585: ®ister_handler("ls2", \&ls2_handler, 0, 1, 0);
1586:
1587: # Process a reinit request. Reinit requests that either
1588: # lonc or lond be reinitialized so that an updated
1589: # host.tab or domain.tab can be processed.
1590: #
1591: # Parameters:
1592: # $cmd - the actual keyword that invoked us.
1593: # $tail - the tail of the request that invoked us.
1594: # $client - File descriptor connected to the client
1595: # Returns:
1596: # 1 - Ok to continue processing.
1597: # 0 - Program should exit
1598: # Implicit output:
1599: # a reply is sent to the client.
1600: #
1601: sub reinit_process_handler {
1602: my ($cmd, $tail, $client) = @_;
1603:
1604: my $userinput = "$cmd:$tail";
1605:
1606: my $cert = &GetCertificate($userinput);
1607: if(&ValidManager($cert)) {
1608: chomp($userinput);
1609: my $reply = &ReinitProcess($userinput);
1610: &Reply( $client, "$reply\n", $userinput);
1611: } else {
1612: &Failure( $client, "refused\n", $userinput);
1613: }
1614: return 1;
1615: }
1616: ®ister_handler("reinit", \&reinit_process_handler, 1, 0, 1);
1617:
1618: # Process the editing script for a table edit operation.
1619: # the editing operation must be encrypted and requested by
1620: # a manager host.
1621: #
1622: # Parameters:
1623: # $cmd - the actual keyword that invoked us.
1624: # $tail - the tail of the request that invoked us.
1625: # $client - File descriptor connected to the client
1626: # Returns:
1627: # 1 - Ok to continue processing.
1628: # 0 - Program should exit
1629: # Implicit output:
1630: # a reply is sent to the client.
1631: #
1632: sub edit_table_handler {
1633: my ($command, $tail, $client) = @_;
1634:
1635: my $userinput = "$command:$tail";
1636:
1637: my $cert = &GetCertificate($userinput);
1638: if(&ValidManager($cert)) {
1639: my($filetype, $script) = split(/:/, $tail);
1640: if (($filetype eq "hosts") ||
1641: ($filetype eq "domain")) {
1642: if($script ne "") {
1643: &Reply($client, # BUGBUG - EditFile
1644: &EditFile($userinput), # could fail.
1645: $userinput);
1646: } else {
1647: &Failure($client,"refused\n",$userinput);
1648: }
1649: } else {
1650: &Failure($client,"refused\n",$userinput);
1651: }
1652: } else {
1653: &Failure($client,"refused\n",$userinput);
1654: }
1655: return 1;
1656: }
1657: ®ister_handler("edit", \&edit_table_handler, 1, 0, 1);
1658:
1659: #
1660: # Authenticate a user against the LonCAPA authentication
1661: # database. Note that there are several authentication
1662: # possibilities:
1663: # - unix - The user can be authenticated against the unix
1664: # password file.
1665: # - internal - The user can be authenticated against a purely
1666: # internal per user password file.
1667: # - kerberos - The user can be authenticated against either a kerb4 or kerb5
1668: # ticket granting authority.
1669: # - user - The person tailoring LonCAPA can supply a user authentication
1670: # mechanism that is per system.
1671: #
1672: # Parameters:
1673: # $cmd - The command that got us here.
1674: # $tail - Tail of the command (remaining parameters).
1675: # $client - File descriptor connected to client.
1676: # Returns
1677: # 0 - Requested to exit, caller should shut down.
1678: # 1 - Continue processing.
1679: # Implicit inputs:
1680: # The authentication systems describe above have their own forms of implicit
1681: # input into the authentication process that are described above.
1682: #
1683: sub authenticate_handler {
1684: my ($cmd, $tail, $client) = @_;
1685:
1686:
1687: # Regenerate the full input line
1688:
1689: my $userinput = $cmd.":".$tail;
1690:
1691: # udom - User's domain.
1692: # uname - Username.
1693: # upass - User's password.
1694:
1695: my ($udom,$uname,$upass)=split(/:/,$tail);
1696: &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
1697: chomp($upass);
1698: $upass=&unescape($upass);
1699:
1700: my $pwdcorrect = &validate_user($udom, $uname, $upass);
1701: if($pwdcorrect) {
1702: &Reply( $client, "authorized\n", $userinput);
1703: #
1704: # Bad credentials: Failed to authorize
1705: #
1706: } else {
1707: &Failure( $client, "non_authorized\n", $userinput);
1708: }
1709:
1710: return 1;
1711: }
1712: ®ister_handler("auth", \&authenticate_handler, 1, 1, 0);
1713:
1714: #
1715: # Change a user's password. Note that this function is complicated by
1716: # the fact that a user may be authenticated in more than one way:
1717: # At present, we are not able to change the password for all types of
1718: # authentication methods. Only for:
1719: # unix - unix password or shadow passoword style authentication.
1720: # local - Locally written authentication mechanism.
1721: # For now, kerb4 and kerb5 password changes are not supported and result
1722: # in an error.
1723: # FUTURE WORK:
1724: # Support kerberos passwd changes?
1725: # Parameters:
1726: # $cmd - The command that got us here.
1727: # $tail - Tail of the command (remaining parameters).
1728: # $client - File descriptor connected to client.
1729: # Returns
1730: # 0 - Requested to exit, caller should shut down.
1731: # 1 - Continue processing.
1732: # Implicit inputs:
1733: # The authentication systems describe above have their own forms of implicit
1734: # input into the authentication process that are described above.
1735: sub change_password_handler {
1736: my ($cmd, $tail, $client) = @_;
1737:
1738: my $userinput = $cmd.":".$tail; # Reconstruct client's string.
1739:
1740: #
1741: # udom - user's domain.
1742: # uname - Username.
1743: # upass - Current password.
1744: # npass - New password.
1745:
1746: my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
1747:
1748: $upass=&unescape($upass);
1749: $npass=&unescape($npass);
1750: &Debug("Trying to change password for $uname");
1751:
1752: # First require that the user can be authenticated with their
1753: # old password:
1754:
1755: my $validated = &validate_user($udom, $uname, $upass);
1756: if($validated) {
1757: my $realpasswd = &get_auth_type($udom, $uname); # Defined since authd.
1758:
1759: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1760: if ($howpwd eq 'internal') {
1761: &Debug("internal auth");
1762: my $salt=time;
1763: $salt=substr($salt,6,2);
1764: my $ncpass=crypt($npass,$salt);
1765: if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
1766: &logthis("Result of password change for "
1767: ."$uname: pwchange_success");
1768: &Reply($client, "ok\n", $userinput);
1769: } else {
1770: &logthis("Unable to open $uname passwd "
1771: ."to change password");
1772: &Failure( $client, "non_authorized\n",$userinput);
1773: }
1774: } elsif ($howpwd eq 'unix') {
1775: my $result = &change_unix_password($uname, $npass);
1776: &logthis("Result of password change for $uname: ".
1777: $result);
1778: &Reply($client, "$result\n", $userinput);
1779: } else {
1780: # this just means that the current password mode is not
1781: # one we know how to change (e.g the kerberos auth modes or
1782: # locally written auth handler).
1783: #
1784: &Failure( $client, "auth_mode_error\n", $userinput);
1785: }
1786:
1787: } else {
1788: &Failure( $client, "non_authorized\n", $userinput);
1789: }
1790:
1791: return 1;
1792: }
1793: ®ister_handler("passwd", \&change_password_handler, 1, 1, 0);
1794:
1795: #
1796: # Create a new user. User in this case means a lon-capa user.
1797: # The user must either already exist in some authentication realm
1798: # like kerberos or the /etc/passwd. If not, a user completely local to
1799: # this loncapa system is created.
1800: #
1801: # Parameters:
1802: # $cmd - The command that got us here.
1803: # $tail - Tail of the command (remaining parameters).
1804: # $client - File descriptor connected to client.
1805: # Returns
1806: # 0 - Requested to exit, caller should shut down.
1807: # 1 - Continue processing.
1808: # Implicit inputs:
1809: # The authentication systems describe above have their own forms of implicit
1810: # input into the authentication process that are described above.
1811: sub add_user_handler {
1812:
1813: my ($cmd, $tail, $client) = @_;
1814:
1815:
1816: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1817: my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
1818:
1819: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
1820:
1821:
1822: if($udom eq $currentdomainid) { # Reject new users for other domains...
1823:
1824: my $oldumask=umask(0077);
1825: chomp($npass);
1826: $npass=&unescape($npass);
1827: my $passfilename = &password_path($udom, $uname);
1828: &Debug("Password file created will be:".$passfilename);
1829: if (-e $passfilename) {
1830: &Failure( $client, "already_exists\n", $userinput);
1831: } else {
1832: my $fperror='';
1833: if (!&mkpath($passfilename)) {
1834: $fperror="error: ".($!+0)." mkdir failed while attempting "
1835: ."makeuser";
1836: }
1837: unless ($fperror) {
1838: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
1839: &Reply($client, $result, $userinput); #BUGBUG - could be fail
1840: } else {
1841: &Failure($client, "$fperror\n", $userinput);
1842: }
1843: }
1844: umask($oldumask);
1845: } else {
1846: &Failure($client, "not_right_domain\n",
1847: $userinput); # Even if we are multihomed.
1848:
1849: }
1850: return 1;
1851:
1852: }
1853: ®ister_handler("makeuser", \&add_user_handler, 1, 1, 0);
1854:
1855: #
1856: # Change the authentication method of a user. Note that this may
1857: # also implicitly change the user's password if, for example, the user is
1858: # joining an existing authentication realm. Known authentication realms at
1859: # this time are:
1860: # internal - Purely internal password file (only loncapa knows this user)
1861: # local - Institutionally written authentication module.
1862: # unix - Unix user (/etc/passwd with or without /etc/shadow).
1863: # kerb4 - kerberos version 4
1864: # kerb5 - kerberos version 5
1865: #
1866: # Parameters:
1867: # $cmd - The command that got us here.
1868: # $tail - Tail of the command (remaining parameters).
1869: # $client - File descriptor connected to client.
1870: # Returns
1871: # 0 - Requested to exit, caller should shut down.
1872: # 1 - Continue processing.
1873: # Implicit inputs:
1874: # The authentication systems describe above have their own forms of implicit
1875: # input into the authentication process that are described above.
1876: # NOTE:
1877: # This is also used to change the authentication credential values (e.g. passwd).
1878: #
1879: #
1880: sub change_authentication_handler {
1881:
1882: my ($cmd, $tail, $client) = @_;
1883:
1884: my $userinput = "$cmd:$tail"; # Reconstruct user input.
1885:
1886: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1887: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
1888: if ($udom ne $currentdomainid) {
1889: &Failure( $client, "not_right_domain\n", $client);
1890: } else {
1891:
1892: chomp($npass);
1893:
1894: $npass=&unescape($npass);
1895: my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
1896: my $passfilename = &password_path($udom, $uname);
1897: if ($passfilename) { # Not allowed to create a new user!!
1898: # If just changing the unix passwd. need to arrange to run
1899: # passwd since otherwise make_passwd_file will run
1900: # lcuseradd which fails if an account already exists
1901: # (to prevent an unscrupulous LONCAPA admin from stealing
1902: # an existing account by overwriting it as a LonCAPA account).
1903:
1904: if(($oldauth =~/^unix/) && ($umode eq "unix")) {
1905: my $result = &change_unix_password($uname, $npass);
1906: &logthis("Result of password change for $uname: ".$result);
1907: if ($result eq "ok") {
1908: &Reply($client, "$result\n")
1909: } else {
1910: &Failure($client, "$result\n");
1911: }
1912: } else {
1913: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
1914: #
1915: # If the current auth mode is internal, and the old auth mode was
1916: # unix, or krb*, and the user is an author for this domain,
1917: # re-run manage_permissions for that role in order to be able
1918: # to take ownership of the construction space back to www:www
1919: #
1920:
1921:
1922: if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
1923: (($oldauth =~ /^internal/) && ($umode eq "unix")) ) {
1924: if(&is_author($udom, $uname)) {
1925: &Debug(" Need to manage author permissions...");
1926: &manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
1927: }
1928: }
1929: &Reply($client, $result, $userinput);
1930: }
1931:
1932:
1933: } else {
1934: &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
1935: }
1936: }
1937: return 1;
1938: }
1939: ®ister_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
1940:
1941: #
1942: # Determines if this is the home server for a user. The home server
1943: # for a user will have his/her lon-capa passwd file. Therefore all we need
1944: # to do is determine if this file exists.
1945: #
1946: # Parameters:
1947: # $cmd - The command that got us here.
1948: # $tail - Tail of the command (remaining parameters).
1949: # $client - File descriptor connected to client.
1950: # Returns
1951: # 0 - Requested to exit, caller should shut down.
1952: # 1 - Continue processing.
1953: # Implicit inputs:
1954: # The authentication systems describe above have their own forms of implicit
1955: # input into the authentication process that are described above.
1956: #
1957: sub is_home_handler {
1958: my ($cmd, $tail, $client) = @_;
1959:
1960: my $userinput = "$cmd:$tail";
1961:
1962: my ($udom,$uname)=split(/:/,$tail);
1963: chomp($uname);
1964: my $passfile = &password_filename($udom, $uname);
1965: if($passfile) {
1966: &Reply( $client, "found\n", $userinput);
1967: } else {
1968: &Failure($client, "not_found\n", $userinput);
1969: }
1970: return 1;
1971: }
1972: ®ister_handler("home", \&is_home_handler, 0,1,0);
1973:
1974: #
1975: # Process an update request for a resource?? I think what's going on here is
1976: # that a resource has been modified that we hold a subscription to.
1977: # If the resource is not local, then we must update, or at least invalidate our
1978: # cached copy of the resource.
1979: # FUTURE WORK:
1980: # I need to look at this logic carefully. My druthers would be to follow
1981: # typical caching logic, and simple invalidate the cache, drop any subscription
1982: # an let the next fetch start the ball rolling again... however that may
1983: # actually be more difficult than it looks given the complex web of
1984: # proxy servers.
1985: # Parameters:
1986: # $cmd - The command that got us here.
1987: # $tail - Tail of the command (remaining parameters).
1988: # $client - File descriptor connected to client.
1989: # Returns
1990: # 0 - Requested to exit, caller should shut down.
1991: # 1 - Continue processing.
1992: # Implicit inputs:
1993: # The authentication systems describe above have their own forms of implicit
1994: # input into the authentication process that are described above.
1995: #
1996: sub update_resource_handler {
1997:
1998: my ($cmd, $tail, $client) = @_;
1999:
2000: my $userinput = "$cmd:$tail";
2001:
2002: my $fname= $tail; # This allows interactive testing
2003:
2004:
2005: my $ownership=ishome($fname);
2006: if ($ownership eq 'not_owner') {
2007: if (-e $fname) {
2008: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
2009: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
2010: my $now=time;
2011: my $since=$now-$atime;
2012: if ($since>$perlvar{'lonExpire'}) {
2013: my $reply=&reply("unsub:$fname","$clientname");
2014: &devalidate_meta_cache($fname);
2015: unlink("$fname");
2016: } else {
2017: my $transname="$fname.in.transfer";
2018: my $remoteurl=&reply("sub:$fname","$clientname");
2019: my $response;
2020: alarm(120);
2021: {
2022: my $ua=new LWP::UserAgent;
2023: my $request=new HTTP::Request('GET',"$remoteurl");
2024: $response=$ua->request($request,$transname);
2025: }
2026: alarm(0);
2027: if ($response->is_error()) {
2028: unlink($transname);
2029: my $message=$response->status_line;
2030: &logthis("LWP GET: $message for $fname ($remoteurl)");
2031: } else {
2032: if ($remoteurl!~/\.meta$/) {
2033: alarm(120);
2034: {
2035: my $ua=new LWP::UserAgent;
2036: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
2037: my $mresponse=$ua->request($mrequest,$fname.'.meta');
2038: if ($mresponse->is_error()) {
2039: unlink($fname.'.meta');
2040: }
2041: }
2042: alarm(0);
2043: }
2044: rename($transname,$fname);
2045: &devalidate_meta_cache($fname);
2046: }
2047: }
2048: &Reply( $client, "ok\n", $userinput);
2049: } else {
2050: &Failure($client, "not_found\n", $userinput);
2051: }
2052: } else {
2053: &Failure($client, "rejected\n", $userinput);
2054: }
2055: return 1;
2056: }
2057: ®ister_handler("update", \&update_resource_handler, 0 ,1, 0);
2058:
2059: sub devalidate_meta_cache {
2060: my ($url) = @_;
2061: use Cache::Memcached;
2062: my $memcache = new Cache::Memcached({'servers'=>['127.0.0.1:11211']});
2063: $url = &declutter($url);
2064: $url =~ s-\.meta$--;
2065: my $id = &escape('meta:'.$url);
2066: $memcache->delete($id);
2067: }
2068:
2069: sub declutter {
2070: my $thisfn=shift;
2071: $thisfn=~s/^\Q$perlvar{'lonDocRoot'}\E//;
2072: $thisfn=~s/^\///;
2073: $thisfn=~s|^adm/wrapper/||;
2074: $thisfn=~s|^adm/coursedocs/showdoc/||;
2075: $thisfn=~s/^res\///;
2076: $thisfn=~s/\?.+$//;
2077: return $thisfn;
2078: }
2079: #
2080: # Fetch a user file from a remote server to the user's home directory
2081: # userfiles subdir.
2082: # Parameters:
2083: # $cmd - The command that got us here.
2084: # $tail - Tail of the command (remaining parameters).
2085: # $client - File descriptor connected to client.
2086: # Returns
2087: # 0 - Requested to exit, caller should shut down.
2088: # 1 - Continue processing.
2089: #
2090: sub fetch_user_file_handler {
2091:
2092: my ($cmd, $tail, $client) = @_;
2093:
2094: my $userinput = "$cmd:$tail";
2095: my $fname = $tail;
2096: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2097: my $udir=&propath($udom,$uname).'/userfiles';
2098: unless (-e $udir) {
2099: mkdir($udir,0770);
2100: }
2101: Debug("fetch user file for $fname");
2102: if (-e $udir) {
2103: $ufile=~s/^[\.\~]+//;
2104:
2105: # IF necessary, create the path right down to the file.
2106: # Note that any regular files in the way of this path are
2107: # wiped out to deal with some earlier folly of mine.
2108:
2109: if (!&mkpath($udir.'/'.$ufile)) {
2110: &Failure($client, "unable_to_create\n", $userinput);
2111: }
2112:
2113: my $destname=$udir.'/'.$ufile;
2114: my $transname=$udir.'/'.$ufile.'.in.transit';
2115: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
2116: my $response;
2117: Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
2118: alarm(120);
2119: {
2120: my $ua=new LWP::UserAgent;
2121: my $request=new HTTP::Request('GET',"$remoteurl");
2122: $response=$ua->request($request,$transname);
2123: }
2124: alarm(0);
2125: if ($response->is_error()) {
2126: unlink($transname);
2127: my $message=$response->status_line;
2128: &logthis("LWP GET: $message for $fname ($remoteurl)");
2129: &Failure($client, "failed\n", $userinput);
2130: } else {
2131: Debug("Renaming $transname to $destname");
2132: if (!rename($transname,$destname)) {
2133: &logthis("Unable to move $transname to $destname");
2134: unlink($transname);
2135: &Failure($client, "failed\n", $userinput);
2136: } else {
2137: &Reply($client, "ok\n", $userinput);
2138: }
2139: }
2140: } else {
2141: &Failure($client, "not_home\n", $userinput);
2142: }
2143: return 1;
2144: }
2145: ®ister_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
2146:
2147: #
2148: # Remove a file from a user's home directory userfiles subdirectory.
2149: # Parameters:
2150: # cmd - the Lond request keyword that got us here.
2151: # tail - the part of the command past the keyword.
2152: # client- File descriptor connected with the client.
2153: #
2154: # Returns:
2155: # 1 - Continue processing.
2156: sub remove_user_file_handler {
2157: my ($cmd, $tail, $client) = @_;
2158:
2159: my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2160:
2161: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2162: if ($ufile =~m|/\.\./|) {
2163: # any files paths with /../ in them refuse
2164: # to deal with
2165: &Failure($client, "refused\n", "$cmd:$tail");
2166: } else {
2167: my $udir = &propath($udom,$uname);
2168: if (-e $udir) {
2169: my $file=$udir.'/userfiles/'.$ufile;
2170: if (-e $file) {
2171: #
2172: # If the file is a regular file unlink is fine...
2173: # However it's possible the client wants a dir.
2174: # removed, in which case rmdir is more approprate:
2175: #
2176: if (-f $file){
2177: unlink($file);
2178: } elsif(-d $file) {
2179: rmdir($file);
2180: }
2181: if (-e $file) {
2182: # File is still there after we deleted it ?!?
2183:
2184: &Failure($client, "failed\n", "$cmd:$tail");
2185: } else {
2186: &Reply($client, "ok\n", "$cmd:$tail");
2187: }
2188: } else {
2189: &Failure($client, "not_found\n", "$cmd:$tail");
2190: }
2191: } else {
2192: &Failure($client, "not_home\n", "$cmd:$tail");
2193: }
2194: }
2195: return 1;
2196: }
2197: ®ister_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
2198:
2199: #
2200: # make a directory in a user's home directory userfiles subdirectory.
2201: # Parameters:
2202: # cmd - the Lond request keyword that got us here.
2203: # tail - the part of the command past the keyword.
2204: # client- File descriptor connected with the client.
2205: #
2206: # Returns:
2207: # 1 - Continue processing.
2208: sub mkdir_user_file_handler {
2209: my ($cmd, $tail, $client) = @_;
2210:
2211: my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2212: $dir=&unescape($dir);
2213: my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
2214: if ($ufile =~m|/\.\./|) {
2215: # any files paths with /../ in them refuse
2216: # to deal with
2217: &Failure($client, "refused\n", "$cmd:$tail");
2218: } else {
2219: my $udir = &propath($udom,$uname);
2220: if (-e $udir) {
2221: my $newdir=$udir.'/userfiles/'.$ufile.'/';
2222: if (!&mkpath($newdir)) {
2223: &Failure($client, "failed\n", "$cmd:$tail");
2224: }
2225: &Reply($client, "ok\n", "$cmd:$tail");
2226: } else {
2227: &Failure($client, "not_home\n", "$cmd:$tail");
2228: }
2229: }
2230: return 1;
2231: }
2232: ®ister_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
2233:
2234: #
2235: # rename a file in a user's home directory userfiles subdirectory.
2236: # Parameters:
2237: # cmd - the Lond request keyword that got us here.
2238: # tail - the part of the command past the keyword.
2239: # client- File descriptor connected with the client.
2240: #
2241: # Returns:
2242: # 1 - Continue processing.
2243: sub rename_user_file_handler {
2244: my ($cmd, $tail, $client) = @_;
2245:
2246: my ($udom,$uname,$old,$new) = split(/:/, $tail);
2247: $old=&unescape($old);
2248: $new=&unescape($new);
2249: if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
2250: # any files paths with /../ in them refuse to deal with
2251: &Failure($client, "refused\n", "$cmd:$tail");
2252: } else {
2253: my $udir = &propath($udom,$uname);
2254: if (-e $udir) {
2255: my $oldfile=$udir.'/userfiles/'.$old;
2256: my $newfile=$udir.'/userfiles/'.$new;
2257: if (-e $newfile) {
2258: &Failure($client, "exists\n", "$cmd:$tail");
2259: } elsif (! -e $oldfile) {
2260: &Failure($client, "not_found\n", "$cmd:$tail");
2261: } else {
2262: if (!rename($oldfile,$newfile)) {
2263: &Failure($client, "failed\n", "$cmd:$tail");
2264: } else {
2265: &Reply($client, "ok\n", "$cmd:$tail");
2266: }
2267: }
2268: } else {
2269: &Failure($client, "not_home\n", "$cmd:$tail");
2270: }
2271: }
2272: return 1;
2273: }
2274: ®ister_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
2275:
2276: #
2277: # Authenticate access to a user file by checking that the token the user's
2278: # passed also exists in their session file
2279: #
2280: # Parameters:
2281: # cmd - The request keyword that dispatched to tus.
2282: # tail - The tail of the request (colon separated parameters).
2283: # client - Filehandle open on the client.
2284: # Return:
2285: # 1.
2286: sub token_auth_user_file_handler {
2287: my ($cmd, $tail, $client) = @_;
2288:
2289: my ($fname, $session) = split(/:/, $tail);
2290:
2291: chomp($session);
2292: my $reply="non_auth\n";
2293: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
2294: $session.'.id')) {
2295: while (my $line=<ENVIN>) {
2296: if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply="ok\n"; }
2297: }
2298: close(ENVIN);
2299: &Reply($client, $reply, "$cmd:$tail");
2300: } else {
2301: &Failure($client, "invalid_token\n", "$cmd:$tail");
2302: }
2303: return 1;
2304:
2305: }
2306: ®ister_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
2307:
2308: #
2309: # Unsubscribe from a resource.
2310: #
2311: # Parameters:
2312: # $cmd - The command that got us here.
2313: # $tail - Tail of the command (remaining parameters).
2314: # $client - File descriptor connected to client.
2315: # Returns
2316: # 0 - Requested to exit, caller should shut down.
2317: # 1 - Continue processing.
2318: #
2319: sub unsubscribe_handler {
2320: my ($cmd, $tail, $client) = @_;
2321:
2322: my $userinput= "$cmd:$tail";
2323:
2324: my ($fname) = split(/:/,$tail); # Split in case there's extrs.
2325:
2326: &Debug("Unsubscribing $fname");
2327: if (-e $fname) {
2328: &Debug("Exists");
2329: &Reply($client, &unsub($fname,$clientip), $userinput);
2330: } else {
2331: &Failure($client, "not_found\n", $userinput);
2332: }
2333: return 1;
2334: }
2335: ®ister_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
2336:
2337: # Subscribe to a resource
2338: #
2339: # Parameters:
2340: # $cmd - The command that got us here.
2341: # $tail - Tail of the command (remaining parameters).
2342: # $client - File descriptor connected to client.
2343: # Returns
2344: # 0 - Requested to exit, caller should shut down.
2345: # 1 - Continue processing.
2346: #
2347: sub subscribe_handler {
2348: my ($cmd, $tail, $client)= @_;
2349:
2350: my $userinput = "$cmd:$tail";
2351:
2352: &Reply( $client, &subscribe($userinput,$clientip), $userinput);
2353:
2354: return 1;
2355: }
2356: ®ister_handler("sub", \&subscribe_handler, 0, 1, 0);
2357:
2358: #
2359: # Determine the version of a resource (?) Or is it return
2360: # the top version of the resource? Not yet clear from the
2361: # code in currentversion.
2362: #
2363: # Parameters:
2364: # $cmd - The command that got us here.
2365: # $tail - Tail of the command (remaining parameters).
2366: # $client - File descriptor connected to client.
2367: # Returns
2368: # 0 - Requested to exit, caller should shut down.
2369: # 1 - Continue processing.
2370: #
2371: sub current_version_handler {
2372: my ($cmd, $tail, $client) = @_;
2373:
2374: my $userinput= "$cmd:$tail";
2375:
2376: my $fname = $tail;
2377: &Reply( $client, ¤tversion($fname)."\n", $userinput);
2378: return 1;
2379:
2380: }
2381: ®ister_handler("currentversion", \¤t_version_handler, 0, 1, 0);
2382:
2383: # Make an entry in a user's activity log.
2384: #
2385: # Parameters:
2386: # $cmd - The command that got us here.
2387: # $tail - Tail of the command (remaining parameters).
2388: # $client - File descriptor connected to client.
2389: # Returns
2390: # 0 - Requested to exit, caller should shut down.
2391: # 1 - Continue processing.
2392: #
2393: sub activity_log_handler {
2394: my ($cmd, $tail, $client) = @_;
2395:
2396:
2397: my $userinput= "$cmd:$tail";
2398:
2399: my ($udom,$uname,$what)=split(/:/,$tail);
2400: chomp($what);
2401: my $proname=&propath($udom,$uname);
2402: my $now=time;
2403: my $hfh;
2404: if ($hfh=IO::File->new(">>$proname/activity.log")) {
2405: print $hfh "$now:$clientname:$what\n";
2406: &Reply( $client, "ok\n", $userinput);
2407: } else {
2408: &Failure($client, "error: ".($!+0)." IO::File->new Failed "
2409: ."while attempting log\n",
2410: $userinput);
2411: }
2412:
2413: return 1;
2414: }
2415: ®ister_handler("log", \&activity_log_handler, 0, 1, 0);
2416:
2417: #
2418: # Put a namespace entry in a user profile hash.
2419: # My druthers would be for this to be an encrypted interaction too.
2420: # anything that might be an inadvertent covert channel about either
2421: # user authentication or user personal information....
2422: #
2423: # Parameters:
2424: # $cmd - The command that got us here.
2425: # $tail - Tail of the command (remaining parameters).
2426: # $client - File descriptor connected to client.
2427: # Returns
2428: # 0 - Requested to exit, caller should shut down.
2429: # 1 - Continue processing.
2430: #
2431: sub put_user_profile_entry {
2432: my ($cmd, $tail, $client) = @_;
2433:
2434: my $userinput = "$cmd:$tail";
2435:
2436: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2437: if ($namespace ne 'roles') {
2438: chomp($what);
2439: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2440: &GDBM_WRCREAT(),"P",$what);
2441: if($hashref) {
2442: my @pairs=split(/\&/,$what);
2443: foreach my $pair (@pairs) {
2444: my ($key,$value)=split(/=/,$pair);
2445: $hashref->{$key}=$value;
2446: }
2447: if (&untie_user_hash($hashref)) {
2448: &Reply( $client, "ok\n", $userinput);
2449: } else {
2450: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2451: "while attempting put\n",
2452: $userinput);
2453: }
2454: } else {
2455: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2456: "while attempting put\n", $userinput);
2457: }
2458: } else {
2459: &Failure( $client, "refused\n", $userinput);
2460: }
2461:
2462: return 1;
2463: }
2464: ®ister_handler("put", \&put_user_profile_entry, 0, 1, 0);
2465:
2466: # Put a piece of new data in hash, returns error if entry already exists
2467: # Parameters:
2468: # $cmd - The command that got us here.
2469: # $tail - Tail of the command (remaining parameters).
2470: # $client - File descriptor connected to client.
2471: # Returns
2472: # 0 - Requested to exit, caller should shut down.
2473: # 1 - Continue processing.
2474: #
2475: sub newput_user_profile_entry {
2476: my ($cmd, $tail, $client) = @_;
2477:
2478: my $userinput = "$cmd:$tail";
2479:
2480: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
2481: if ($namespace eq 'roles') {
2482: &Failure( $client, "refused\n", $userinput);
2483: return 1;
2484: }
2485:
2486: chomp($what);
2487:
2488: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2489: &GDBM_WRCREAT(),"N",$what);
2490: if(!$hashref) {
2491: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2492: "while attempting put\n", $userinput);
2493: return 1;
2494: }
2495:
2496: my @pairs=split(/\&/,$what);
2497: foreach my $pair (@pairs) {
2498: my ($key,$value)=split(/=/,$pair);
2499: if (exists($hashref->{$key})) {
2500: &Failure($client, "key_exists: ".$key."\n",$userinput);
2501: return 1;
2502: }
2503: }
2504:
2505: foreach my $pair (@pairs) {
2506: my ($key,$value)=split(/=/,$pair);
2507: $hashref->{$key}=$value;
2508: }
2509:
2510: if (&untie_user_hash($hashref)) {
2511: &Reply( $client, "ok\n", $userinput);
2512: } else {
2513: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2514: "while attempting put\n",
2515: $userinput);
2516: }
2517: return 1;
2518: }
2519: ®ister_handler("newput", \&newput_user_profile_entry, 0, 1, 0);
2520:
2521: #
2522: # Increment a profile entry in the user history file.
2523: # The history contains keyword value pairs. In this case,
2524: # The value itself is a pair of numbers. The first, the current value
2525: # the second an increment that this function applies to the current
2526: # value.
2527: #
2528: # Parameters:
2529: # $cmd - The command that got us here.
2530: # $tail - Tail of the command (remaining parameters).
2531: # $client - File descriptor connected to client.
2532: # Returns
2533: # 0 - Requested to exit, caller should shut down.
2534: # 1 - Continue processing.
2535: #
2536: sub increment_user_value_handler {
2537: my ($cmd, $tail, $client) = @_;
2538:
2539: my $userinput = "$cmd:$tail";
2540:
2541: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
2542: if ($namespace ne 'roles') {
2543: chomp($what);
2544: my $hashref = &tie_user_hash($udom, $uname,
2545: $namespace, &GDBM_WRCREAT(),
2546: "P",$what);
2547: if ($hashref) {
2548: my @pairs=split(/\&/,$what);
2549: foreach my $pair (@pairs) {
2550: my ($key,$value)=split(/=/,$pair);
2551: $value = &unescape($value);
2552: # We could check that we have a number...
2553: if (! defined($value) || $value eq '') {
2554: $value = 1;
2555: }
2556: $hashref->{$key}+=$value;
2557: if ($namespace eq 'nohist_resourcetracker') {
2558: if ($hashref->{$key} < 0) {
2559: $hashref->{$key} = 0;
2560: }
2561: }
2562: }
2563: if (&untie_user_hash($hashref)) {
2564: &Reply( $client, "ok\n", $userinput);
2565: } else {
2566: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2567: "while attempting inc\n", $userinput);
2568: }
2569: } else {
2570: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2571: "while attempting inc\n", $userinput);
2572: }
2573: } else {
2574: &Failure($client, "refused\n", $userinput);
2575: }
2576:
2577: return 1;
2578: }
2579: ®ister_handler("inc", \&increment_user_value_handler, 0, 1, 0);
2580:
2581: #
2582: # Put a new role for a user. Roles are LonCAPA's packaging of permissions.
2583: # Each 'role' a user has implies a set of permissions. Adding a new role
2584: # for a person grants the permissions packaged with that role
2585: # to that user when the role is selected.
2586: #
2587: # Parameters:
2588: # $cmd - The command string (rolesput).
2589: # $tail - The remainder of the request line. For rolesput this
2590: # consists of a colon separated list that contains:
2591: # The domain and user that is granting the role (logged).
2592: # The domain and user that is getting the role.
2593: # The roles being granted as a set of & separated pairs.
2594: # each pair a key value pair.
2595: # $client - File descriptor connected to the client.
2596: # Returns:
2597: # 0 - If the daemon should exit
2598: # 1 - To continue processing.
2599: #
2600: #
2601: sub roles_put_handler {
2602: my ($cmd, $tail, $client) = @_;
2603:
2604: my $userinput = "$cmd:$tail";
2605:
2606: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail);
2607:
2608:
2609: my $namespace='roles';
2610: chomp($what);
2611: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2612: &GDBM_WRCREAT(), "P",
2613: "$exedom:$exeuser:$what");
2614: #
2615: # Log the attempt to set a role. The {}'s here ensure that the file
2616: # handle is open for the minimal amount of time. Since the flush
2617: # is done on close this improves the chances the log will be an un-
2618: # corrupted ordered thing.
2619: if ($hashref) {
2620: my $pass_entry = &get_auth_type($udom, $uname);
2621: my ($auth_type,$pwd) = split(/:/, $pass_entry);
2622: $auth_type = $auth_type.":";
2623: my @pairs=split(/\&/,$what);
2624: foreach my $pair (@pairs) {
2625: my ($key,$value)=split(/=/,$pair);
2626: &manage_permissions($key, $udom, $uname,
2627: $auth_type);
2628: $hashref->{$key}=$value;
2629: }
2630: if (&untie_user_hash($hashref)) {
2631: &Reply($client, "ok\n", $userinput);
2632: } else {
2633: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2634: "while attempting rolesput\n", $userinput);
2635: }
2636: } else {
2637: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2638: "while attempting rolesput\n", $userinput);
2639: }
2640: return 1;
2641: }
2642: ®ister_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only.
2643:
2644: #
2645: # Deletes (removes) a role for a user. This is equivalent to removing
2646: # a permissions package associated with the role from the user's profile.
2647: #
2648: # Parameters:
2649: # $cmd - The command (rolesdel)
2650: # $tail - The remainder of the request line. This consists
2651: # of:
2652: # The domain and user requesting the change (logged)
2653: # The domain and user being changed.
2654: # The roles being revoked. These are shipped to us
2655: # as a bunch of & separated role name keywords.
2656: # $client - The file handle open on the client.
2657: # Returns:
2658: # 1 - Continue processing
2659: # 0 - Exit.
2660: #
2661: sub roles_delete_handler {
2662: my ($cmd, $tail, $client) = @_;
2663:
2664: my $userinput = "$cmd:$tail";
2665:
2666: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
2667: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
2668: "what = ".$what);
2669: my $namespace='roles';
2670: chomp($what);
2671: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2672: &GDBM_WRCREAT(), "D",
2673: "$exedom:$exeuser:$what");
2674:
2675: if ($hashref) {
2676: my @rolekeys=split(/\&/,$what);
2677:
2678: foreach my $key (@rolekeys) {
2679: delete $hashref->{$key};
2680: }
2681: if (&untie_user_hash($hashref)) {
2682: &Reply($client, "ok\n", $userinput);
2683: } else {
2684: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2685: "while attempting rolesdel\n", $userinput);
2686: }
2687: } else {
2688: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2689: "while attempting rolesdel\n", $userinput);
2690: }
2691:
2692: return 1;
2693: }
2694: ®ister_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
2695:
2696: # Unencrypted get from a user's profile database. See
2697: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
2698: # This function retrieves a keyed item from a specific named database in the
2699: # user's directory.
2700: #
2701: # Parameters:
2702: # $cmd - Command request keyword (get).
2703: # $tail - Tail of the command. This is a colon separated list
2704: # consisting of the domain and username that uniquely
2705: # identifies the profile,
2706: # The 'namespace' which selects the gdbm file to
2707: # do the lookup in,
2708: # & separated list of keys to lookup. Note that
2709: # the values are returned as an & separated list too.
2710: # $client - File descriptor open on the client.
2711: # Returns:
2712: # 1 - Continue processing.
2713: # 0 - Exit.
2714: #
2715: sub get_profile_entry {
2716: my ($cmd, $tail, $client) = @_;
2717:
2718: my $userinput= "$cmd:$tail";
2719:
2720: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2721: chomp($what);
2722:
2723: my $replystring = read_profile($udom, $uname, $namespace, $what);
2724: my ($first) = split(/:/,$replystring);
2725: if($first ne "error") {
2726: &Reply($client, "$replystring\n", $userinput);
2727: } else {
2728: &Failure($client, $replystring." while attempting get\n", $userinput);
2729: }
2730: return 1;
2731:
2732:
2733: }
2734: ®ister_handler("get", \&get_profile_entry, 0,1,0);
2735:
2736: #
2737: # Process the encrypted get request. Note that the request is sent
2738: # in clear, but the reply is encrypted. This is a small covert channel:
2739: # information about the sensitive keys is given to the snooper. Just not
2740: # information about the values of the sensitive key. Hmm if I wanted to
2741: # know these I'd snoop for the egets. Get the profile item names from them
2742: # and then issue a get for them since there's no enforcement of the
2743: # requirement of an encrypted get for particular profile items. If I
2744: # were re-doing this, I'd force the request to be encrypted as well as the
2745: # reply. I'd also just enforce encrypted transactions for all gets since
2746: # that would prevent any covert channel snooping.
2747: #
2748: # Parameters:
2749: # $cmd - Command keyword of request (eget).
2750: # $tail - Tail of the command. See GetProfileEntry
# for more information about this.
2751: # $client - File open on the client.
2752: # Returns:
2753: # 1 - Continue processing
2754: # 0 - server should exit.
2755: sub get_profile_entry_encrypted {
2756: my ($cmd, $tail, $client) = @_;
2757:
2758: my $userinput = "$cmd:$tail";
2759:
2760: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
2761: chomp($what);
2762: my $qresult = read_profile($udom, $uname, $namespace, $what);
2763: my ($first) = split(/:/, $qresult);
2764: if($first ne "error") {
2765:
2766: if ($cipher) {
2767: my $cmdlength=length($qresult);
2768: $qresult.=" ";
2769: my $encqresult='';
2770: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2771: $encqresult.= unpack("H16",
2772: $cipher->encrypt(substr($qresult,
2773: $encidx,
2774: 8)));
2775: }
2776: &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
2777: } else {
2778: &Failure( $client, "error:no_key\n", $userinput);
2779: }
2780: } else {
2781: &Failure($client, "$qresult while attempting eget\n", $userinput);
2782:
2783: }
2784:
2785: return 1;
2786: }
2787: ®ister_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
2788:
2789: #
2790: # Deletes a key in a user profile database.
2791: #
2792: # Parameters:
2793: # $cmd - Command keyword (del).
2794: # $tail - Command tail. IN this case a colon
2795: # separated list containing:
2796: # The domain and user that identifies uniquely
2797: # the identity of the user.
2798: # The profile namespace (name of the profile
2799: # database file).
2800: # & separated list of keywords to delete.
2801: # $client - File open on client socket.
2802: # Returns:
2803: # 1 - Continue processing
2804: # 0 - Exit server.
2805: #
2806: #
2807: sub delete_profile_entry {
2808: my ($cmd, $tail, $client) = @_;
2809:
2810: my $userinput = "cmd:$tail";
2811:
2812: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2813: chomp($what);
2814: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2815: &GDBM_WRCREAT(),
2816: "D",$what);
2817: if ($hashref) {
2818: my @keys=split(/\&/,$what);
2819: foreach my $key (@keys) {
2820: delete($hashref->{$key});
2821: }
2822: if (&untie_user_hash($hashref)) {
2823: &Reply($client, "ok\n", $userinput);
2824: } else {
2825: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2826: "while attempting del\n", $userinput);
2827: }
2828: } else {
2829: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2830: "while attempting del\n", $userinput);
2831: }
2832: return 1;
2833: }
2834: ®ister_handler("del", \&delete_profile_entry, 0, 1, 0);
2835:
2836: #
2837: # List the set of keys that are defined in a profile database file.
2838: # A successful reply from this will contain an & separated list of
2839: # the keys.
2840: # Parameters:
2841: # $cmd - Command request (keys).
2842: # $tail - Remainder of the request, a colon separated
2843: # list containing domain/user that identifies the
2844: # user being queried, and the database namespace
2845: # (database filename essentially).
2846: # $client - File open on the client.
2847: # Returns:
2848: # 1 - Continue processing.
2849: # 0 - Exit the server.
2850: #
2851: sub get_profile_keys {
2852: my ($cmd, $tail, $client) = @_;
2853:
2854: my $userinput = "$cmd:$tail";
2855:
2856: my ($udom,$uname,$namespace)=split(/:/,$tail);
2857: my $qresult='';
2858: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2859: &GDBM_READER());
2860: if ($hashref) {
2861: foreach my $key (keys %$hashref) {
2862: $qresult.="$key&";
2863: }
2864: if (&untie_user_hash($hashref)) {
2865: $qresult=~s/\&$//;
2866: &Reply($client, "$qresult\n", $userinput);
2867: } else {
2868: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2869: "while attempting keys\n", $userinput);
2870: }
2871: } else {
2872: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2873: "while attempting keys\n", $userinput);
2874: }
2875:
2876: return 1;
2877: }
2878: ®ister_handler("keys", \&get_profile_keys, 0, 1, 0);
2879:
2880: #
2881: # Dump the contents of a user profile database.
2882: # Note that this constitutes a very large covert channel too since
2883: # the dump will return sensitive information that is not encrypted.
2884: # The naive security assumption is that the session negotiation ensures
2885: # our client is trusted and I don't believe that's assured at present.
2886: # Sure want badly to go to ssl or tls. Of course if my peer isn't really
2887: # a LonCAPA node they could have negotiated an encryption key too so >sigh<.
2888: #
2889: # Parameters:
2890: # $cmd - The command request keyword (currentdump).
2891: # $tail - Remainder of the request, consisting of a colon
2892: # separated list that has the domain/username and
2893: # the namespace to dump (database file).
2894: # $client - file open on the remote client.
2895: # Returns:
2896: # 1 - Continue processing.
2897: # 0 - Exit the server.
2898: #
2899: sub dump_profile_database {
2900: my ($cmd, $tail, $client) = @_;
2901:
2902: my $userinput = "$cmd:$tail";
2903:
2904: my ($udom,$uname,$namespace) = split(/:/,$tail);
2905: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2906: &GDBM_READER());
2907: if ($hashref) {
2908: # Structure of %data:
2909: # $data{$symb}->{$parameter}=$value;
2910: # $data{$symb}->{'v.'.$parameter}=$version;
2911: # since $parameter will be unescaped, we do not
2912: # have to worry about silly parameter names...
2913:
2914: my $qresult='';
2915: my %data = (); # A hash of anonymous hashes..
2916: while (my ($key,$value) = each(%$hashref)) {
2917: my ($v,$symb,$param) = split(/:/,$key);
2918: next if ($v eq 'version' || $symb eq 'keys');
2919: next if (exists($data{$symb}) &&
2920: exists($data{$symb}->{$param}) &&
2921: $data{$symb}->{'v.'.$param} > $v);
2922: $data{$symb}->{$param}=$value;
2923: $data{$symb}->{'v.'.$param}=$v;
2924: }
2925: if (&untie_user_hash($hashref)) {
2926: while (my ($symb,$param_hash) = each(%data)) {
2927: while(my ($param,$value) = each (%$param_hash)){
2928: next if ($param =~ /^v\./); # Ignore versions...
2929: #
2930: # Just dump the symb=value pairs separated by &
2931: #
2932: $qresult.=$symb.':'.$param.'='.$value.'&';
2933: }
2934: }
2935: chop($qresult);
2936: &Reply($client , "$qresult\n", $userinput);
2937: } else {
2938: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2939: "while attempting currentdump\n", $userinput);
2940: }
2941: } else {
2942: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2943: "while attempting currentdump\n", $userinput);
2944: }
2945:
2946: return 1;
2947: }
2948: ®ister_handler("currentdump", \&dump_profile_database, 0, 1, 0);
2949:
2950: #
2951: # Dump a profile database with an optional regular expression
2952: # to match against the keys. In this dump, no effort is made
2953: # to separate symb from version information. Presumably the
2954: # databases that are dumped by this command are of a different
2955: # structure. Need to look at this and improve the documentation of
2956: # both this and the currentdump handler.
2957: # Parameters:
2958: # $cmd - The command keyword.
2959: # $tail - All of the characters after the $cmd:
2960: # These are expected to be a colon
2961: # separated list containing:
2962: # domain/user - identifying the user.
2963: # namespace - identifying the database.
2964: # regexp - optional regular expression
2965: # that is matched against
2966: # database keywords to do
2967: # selective dumps.
2968: # $client - Channel open on the client.
2969: # Returns:
2970: # 1 - Continue processing.
2971: # Side effects:
2972: # response is written to $client.
2973: #
2974: sub dump_with_regexp {
2975: my ($cmd, $tail, $client) = @_;
2976:
2977:
2978: my $userinput = "$cmd:$tail";
2979:
2980: my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
2981: if (defined($regexp)) {
2982: $regexp=&unescape($regexp);
2983: } else {
2984: $regexp='.';
2985: }
2986: my ($start,$end);
2987: if (defined($range)) {
2988: if ($range =~/^(\d+)\-(\d+)$/) {
2989: ($start,$end) = ($1,$2);
2990: } elsif ($range =~/^(\d+)$/) {
2991: ($start,$end) = (0,$1);
2992: } else {
2993: undef($range);
2994: }
2995: }
2996: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2997: &GDBM_READER());
2998: if ($hashref) {
2999: my $qresult='';
3000: my $count=0;
3001: while (my ($key,$value) = each(%$hashref)) {
3002: if ($regexp eq '.') {
3003: $count++;
3004: if (defined($range) && $count >= $end) { last; }
3005: if (defined($range) && $count < $start) { next; }
3006: $qresult.=$key.'='.$value.'&';
3007: } else {
3008: my $unescapeKey = &unescape($key);
3009: if (eval('$unescapeKey=~/$regexp/')) {
3010: $count++;
3011: if (defined($range) && $count >= $end) { last; }
3012: if (defined($range) && $count < $start) { next; }
3013: $qresult.="$key=$value&";
3014: }
3015: }
3016: }
3017: if (&untie_user_hash($hashref)) {
3018: chop($qresult);
3019: &Reply($client, "$qresult\n", $userinput);
3020: } else {
3021: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
3022: "while attempting dump\n", $userinput);
3023: }
3024: } else {
3025: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3026: "while attempting dump\n", $userinput);
3027: }
3028:
3029: return 1;
3030: }
3031: ®ister_handler("dump", \&dump_with_regexp, 0, 1, 0);
3032:
3033: # Store a set of key=value pairs associated with a versioned name.
3034: #
3035: # Parameters:
3036: # $cmd - Request command keyword.
3037: # $tail - Tail of the request. This is a colon
3038: # separated list containing:
3039: # domain/user - User and authentication domain.
3040: # namespace - Name of the database being modified
3041: # rid - Resource keyword to modify.
3042: # what - new value associated with rid.
3043: #
3044: # $client - Socket open on the client.
3045: #
3046: #
3047: # Returns:
3048: # 1 (keep on processing).
3049: # Side-Effects:
3050: # Writes to the client
3051: sub store_handler {
3052: my ($cmd, $tail, $client) = @_;
3053:
3054: my $userinput = "$cmd:$tail";
3055:
3056: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
3057: if ($namespace ne 'roles') {
3058:
3059: chomp($what);
3060: my @pairs=split(/\&/,$what);
3061: my $hashref = &tie_user_hash($udom, $uname, $namespace,
3062: &GDBM_WRCREAT(), "S",
3063: "$rid:$what");
3064: if ($hashref) {
3065: my $now = time;
3066: my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
3067: my $key;
3068: $hashref->{"version:$rid"}++;
3069: my $version=$hashref->{"version:$rid"};
3070: my $allkeys='';
3071: foreach my $pair (@pairs) {
3072: my ($key,$value)=split(/=/,$pair);
3073: $allkeys.=$key.':';
3074: $hashref->{"$version:$rid:$key"}=$value;
3075: }
3076: $hashref->{"$version:$rid:timestamp"}=$now;
3077: $allkeys.='timestamp';
3078: $hashref->{"$version:keys:$rid"}=$allkeys;
3079: if (&untie_user_hash($hashref)) {
3080: &Reply($client, "ok\n", $userinput);
3081: } else {
3082: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3083: "while attempting store\n", $userinput);
3084: }
3085: } else {
3086: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3087: "while attempting store\n", $userinput);
3088: }
3089: } else {
3090: &Failure($client, "refused\n", $userinput);
3091: }
3092:
3093: return 1;
3094: }
3095: ®ister_handler("store", \&store_handler, 0, 1, 0);
3096:
3097: # Modify a set of key=value pairs associated with a versioned name.
3098: #
3099: # Parameters:
3100: # $cmd - Request command keyword.
3101: # $tail - Tail of the request. This is a colon
3102: # separated list containing:
3103: # domain/user - User and authentication domain.
3104: # namespace - Name of the database being modified
3105: # rid - Resource keyword to modify.
3106: # v - Version item to modify
3107: # what - new value associated with rid.
3108: #
3109: # $client - Socket open on the client.
3110: #
3111: #
3112: # Returns:
3113: # 1 (keep on processing).
3114: # Side-Effects:
3115: # Writes to the client
3116: sub putstore_handler {
3117: my ($cmd, $tail, $client) = @_;
3118:
3119: my $userinput = "$cmd:$tail";
3120:
3121: my ($udom,$uname,$namespace,$rid,$v,$what) =split(/:/,$tail);
3122: if ($namespace ne 'roles') {
3123:
3124: chomp($what);
3125: my $hashref = &tie_user_hash($udom, $uname, $namespace,
3126: &GDBM_WRCREAT(), "M",
3127: "$rid:$v:$what");
3128: if ($hashref) {
3129: my $now = time;
3130: my %data = &hash_extract($what);
3131: my @allkeys;
3132: while (my($key,$value) = each(%data)) {
3133: push(@allkeys,$key);
3134: $hashref->{"$v:$rid:$key"} = $value;
3135: }
3136: my $allkeys = join(':',@allkeys);
3137: $hashref->{"$v:keys:$rid"}=$allkeys;
3138:
3139: if (&untie_user_hash($hashref)) {
3140: &Reply($client, "ok\n", $userinput);
3141: } else {
3142: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3143: "while attempting store\n", $userinput);
3144: }
3145: } else {
3146: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3147: "while attempting store\n", $userinput);
3148: }
3149: } else {
3150: &Failure($client, "refused\n", $userinput);
3151: }
3152:
3153: return 1;
3154: }
3155: ®ister_handler("putstore", \&putstore_handler, 0, 1, 0);
3156:
3157: sub hash_extract {
3158: my ($str)=@_;
3159: my %hash;
3160: foreach my $pair (split(/\&/,$str)) {
3161: my ($key,$value)=split(/=/,$pair);
3162: $hash{$key}=$value;
3163: }
3164: return (%hash);
3165: }
3166: sub hash_to_str {
3167: my ($hash_ref)=@_;
3168: my $str;
3169: foreach my $key (keys(%$hash_ref)) {
3170: $str.=$key.'='.$hash_ref->{$key}.'&';
3171: }
3172: $str=~s/\&$//;
3173: return $str;
3174: }
3175:
3176: #
3177: # Dump out all versions of a resource that has key=value pairs associated
3178: # with it for each version. These resources are built up via the store
3179: # command.
3180: #
3181: # Parameters:
3182: # $cmd - Command keyword.
3183: # $tail - Remainder of the request which consists of:
3184: # domain/user - User and auth. domain.
3185: # namespace - name of resource database.
3186: # rid - Resource id.
3187: # $client - socket open on the client.
3188: #
3189: # Returns:
3190: # 1 indicating the caller should not yet exit.
3191: # Side-effects:
3192: # Writes a reply to the client.
3193: # The reply is a string of the following shape:
3194: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
3195: # Where the 1 above represents version 1.
3196: # this continues for all pairs of keys in all versions.
3197: #
3198: #
3199: #
3200: #
3201: sub restore_handler {
3202: my ($cmd, $tail, $client) = @_;
3203:
3204: my $userinput = "$cmd:$tail"; # Only used for logging purposes.
3205:
3206: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
3207: $namespace=~s/\//\_/g;
3208: $namespace=~s/\W//g;
3209: chomp($rid);
3210: my $qresult='';
3211: my $hashref = &tie_user_hash($udom, $uname, $namespace, &GDBM_READER());
3212: if ($hashref) {
3213: my $version=$hashref->{"version:$rid"};
3214: $qresult.="version=$version&";
3215: my $scope;
3216: for ($scope=1;$scope<=$version;$scope++) {
3217: my $vkeys=$hashref->{"$scope:keys:$rid"};
3218: my @keys=split(/:/,$vkeys);
3219: my $key;
3220: $qresult.="$scope:keys=$vkeys&";
3221: foreach $key (@keys) {
3222: $qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
3223: }
3224: }
3225: if (&untie_user_hash($hashref)) {
3226: $qresult=~s/\&$//;
3227: &Reply( $client, "$qresult\n", $userinput);
3228: } else {
3229: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3230: "while attempting restore\n", $userinput);
3231: }
3232: } else {
3233: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3234: "while attempting restore\n", $userinput);
3235: }
3236:
3237: return 1;
3238:
3239:
3240: }
3241: ®ister_handler("restore", \&restore_handler, 0,1,0);
3242:
3243: #
3244: # Add a chat message to a synchronous discussion board.
3245: #
3246: # Parameters:
3247: # $cmd - Request keyword.
3248: # $tail - Tail of the command. A colon separated list
3249: # containing:
3250: # cdom - Domain on which the chat board lives
3251: # cnum - Course containing the chat board.
3252: # newpost - Body of the posting.
3253: # group - Optional group, if chat board is only
3254: # accessible in a group within the course
3255: # $client - Socket open on the client.
3256: # Returns:
3257: # 1 - Indicating caller should keep on processing.
3258: #
3259: # Side-effects:
3260: # writes a reply to the client.
3261: #
3262: #
3263: sub send_chat_handler {
3264: my ($cmd, $tail, $client) = @_;
3265:
3266:
3267: my $userinput = "$cmd:$tail";
3268:
3269: my ($cdom,$cnum,$newpost,$group)=split(/\:/,$tail);
3270: &chat_add($cdom,$cnum,$newpost,$group);
3271: &Reply($client, "ok\n", $userinput);
3272:
3273: return 1;
3274: }
3275: ®ister_handler("chatsend", \&send_chat_handler, 0, 1, 0);
3276:
3277: #
3278: # Retrieve the set of chat messages from a discussion board.
3279: #
3280: # Parameters:
3281: # $cmd - Command keyword that initiated the request.
3282: # $tail - Remainder of the request after the command
3283: # keyword. In this case a colon separated list of
3284: # chat domain - Which discussion board.
3285: # chat id - Discussion thread(?)
3286: # domain/user - Authentication domain and username
3287: # of the requesting person.
3288: # group - Optional course group containing
3289: # the board.
3290: # $client - Socket open on the client program.
3291: # Returns:
3292: # 1 - continue processing
3293: # Side effects:
3294: # Response is written to the client.
3295: #
3296: sub retrieve_chat_handler {
3297: my ($cmd, $tail, $client) = @_;
3298:
3299:
3300: my $userinput = "$cmd:$tail";
3301:
3302: my ($cdom,$cnum,$udom,$uname,$group)=split(/\:/,$tail);
3303: my $reply='';
3304: foreach (&get_chat($cdom,$cnum,$udom,$uname,$group)) {
3305: $reply.=&escape($_).':';
3306: }
3307: $reply=~s/\:$//;
3308: &Reply($client, $reply."\n", $userinput);
3309:
3310:
3311: return 1;
3312: }
3313: ®ister_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
3314:
3315: #
3316: # Initiate a query of an sql database. SQL query repsonses get put in
3317: # a file for later retrieval. This prevents sql query results from
3318: # bottlenecking the system. Note that with loncnew, perhaps this is
3319: # less of an issue since multiple outstanding requests can be concurrently
3320: # serviced.
3321: #
3322: # Parameters:
3323: # $cmd - COmmand keyword that initiated the request.
3324: # $tail - Remainder of the command after the keyword.
3325: # For this function, this consists of a query and
3326: # 3 arguments that are self-documentingly labelled
3327: # in the original arg1, arg2, arg3.
3328: # $client - Socket open on the client.
3329: # Return:
3330: # 1 - Indicating processing should continue.
3331: # Side-effects:
3332: # a reply is written to $client.
3333: #
3334: sub send_query_handler {
3335: my ($cmd, $tail, $client) = @_;
3336:
3337:
3338: my $userinput = "$cmd:$tail";
3339:
3340: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
3341: $query=~s/\n*$//g;
3342: &Reply($client, "". &sql_reply("$clientname\&$query".
3343: "\&$arg1"."\&$arg2"."\&$arg3")."\n",
3344: $userinput);
3345:
3346: return 1;
3347: }
3348: ®ister_handler("querysend", \&send_query_handler, 0, 1, 0);
3349:
3350: #
3351: # Add a reply to an sql query. SQL queries are done asyncrhonously.
3352: # The query is submitted via a "querysend" transaction.
3353: # There it is passed on to the lonsql daemon, queued and issued to
3354: # mysql.
3355: # This transaction is invoked when the sql transaction is complete
3356: # it stores the query results in flie and indicates query completion.
3357: # presumably local software then fetches this response... I'm guessing
3358: # the sequence is: lonc does a querysend, we ask lonsql to do it.
3359: # lonsql on completion of the query interacts with the lond of our
3360: # client to do a query reply storing two files:
3361: # - id - The results of the query.
3362: # - id.end - Indicating the transaction completed.
3363: # NOTE: id is a unique id assigned to the query and querysend time.
3364: # Parameters:
3365: # $cmd - Command keyword that initiated this request.
3366: # $tail - Remainder of the tail. In this case that's a colon
3367: # separated list containing the query Id and the
3368: # results of the query.
3369: # $client - Socket open on the client.
3370: # Return:
3371: # 1 - Indicating that we should continue processing.
3372: # Side effects:
3373: # ok written to the client.
3374: #
3375: sub reply_query_handler {
3376: my ($cmd, $tail, $client) = @_;
3377:
3378:
3379: my $userinput = "$cmd:$tail";
3380:
3381: my ($cmd,$id,$reply)=split(/:/,$userinput);
3382: my $store;
3383: my $execdir=$perlvar{'lonDaemons'};
3384: if ($store=IO::File->new(">$execdir/tmp/$id")) {
3385: $reply=~s/\&/\n/g;
3386: print $store $reply;
3387: close $store;
3388: my $store2=IO::File->new(">$execdir/tmp/$id.end");
3389: print $store2 "done\n";
3390: close $store2;
3391: &Reply($client, "ok\n", $userinput);
3392: } else {
3393: &Failure($client, "error: ".($!+0)
3394: ." IO::File->new Failed ".
3395: "while attempting queryreply\n", $userinput);
3396: }
3397:
3398:
3399: return 1;
3400: }
3401: ®ister_handler("queryreply", \&reply_query_handler, 0, 1, 0);
3402:
3403: #
3404: # Process the courseidput request. Not quite sure what this means
3405: # at the system level sense. It appears a gdbm file in the
3406: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and
3407: # a set of entries made in that database.
3408: #
3409: # Parameters:
3410: # $cmd - The command keyword that initiated this request.
3411: # $tail - Tail of the command. In this case consists of a colon
3412: # separated list contaning the domain to apply this to and
3413: # an ampersand separated list of keyword=value pairs.
3414: # Each value is a colon separated list that includes:
3415: # description, institutional code and course owner.
3416: # For backward compatibility with versions included
3417: # in LON-CAPA 1.1.X (and earlier) and 1.2.X, institutional
3418: # code and/or course owner are preserved from the existing
3419: # record when writing a new record in response to 1.1 or
3420: # 1.2 implementations of lonnet::flushcourselogs().
3421: #
3422: # $client - Socket open on the client.
3423: # Returns:
3424: # 1 - indicating that processing should continue
3425: #
3426: # Side effects:
3427: # reply is written to the client.
3428: #
3429: sub put_course_id_handler {
3430: my ($cmd, $tail, $client) = @_;
3431:
3432:
3433: my $userinput = "$cmd:$tail";
3434:
3435: my ($udom, $what) = split(/:/, $tail,2);
3436: chomp($what);
3437: my $now=time;
3438: my @pairs=split(/\&/,$what);
3439:
3440: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3441: if ($hashref) {
3442: foreach my $pair (@pairs) {
3443: my ($key,$courseinfo) = split(/=/,$pair,2);
3444: $courseinfo =~ s/=/:/g;
3445:
3446: my @current_items = split(/:/,$hashref->{$key});
3447: shift(@current_items); # remove description
3448: pop(@current_items); # remove last access
3449: my $numcurrent = scalar(@current_items);
3450:
3451: my @new_items = split(/:/,$courseinfo);
3452: my $numnew = scalar(@new_items);
3453: if ($numcurrent > 0) {
3454: if ($numnew == 1) { # flushcourselogs() from 1.1 or earlier
3455: $courseinfo .= ':'.join(':',@current_items);
3456: } elsif ($numnew == 2) { # flushcourselogs() from 1.2.X
3457: $courseinfo .= ':'.$current_items[$numcurrent-1];
3458: }
3459: }
3460: $hashref->{$key}=$courseinfo.':'.$now;
3461: }
3462: if (&untie_domain_hash($hashref)) {
3463: &Reply( $client, "ok\n", $userinput);
3464: } else {
3465: &Failure($client, "error: ".($!+0)
3466: ." untie(GDBM) Failed ".
3467: "while attempting courseidput\n", $userinput);
3468: }
3469: } else {
3470: &Failure($client, "error: ".($!+0)
3471: ." tie(GDBM) Failed ".
3472: "while attempting courseidput\n", $userinput);
3473: }
3474:
3475:
3476: return 1;
3477: }
3478: ®ister_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
3479:
3480: # Retrieves the value of a course id resource keyword pattern
3481: # defined since a starting date. Both the starting date and the
3482: # keyword pattern are optional. If the starting date is not supplied it
3483: # is treated as the beginning of time. If the pattern is not found,
3484: # it is treatred as "." matching everything.
3485: #
3486: # Parameters:
3487: # $cmd - Command keyword that resulted in us being dispatched.
3488: # $tail - The remainder of the command that, in this case, consists
3489: # of a colon separated list of:
3490: # domain - The domain in which the course database is
3491: # defined.
3492: # since - Optional parameter describing the minimum
3493: # time of definition(?) of the resources that
3494: # will match the dump.
3495: # description - regular expression that is used to filter
3496: # the dump. Only keywords matching this regexp
3497: # will be used.
3498: # institutional code - optional supplied code to filter
3499: # the dump. Only courses with an institutional code
3500: # that match the supplied code will be returned.
3501: # owner - optional supplied username of owner to filter
3502: # the dump. Only courses for which the course
3503: # owner matches the supplied username will be
3504: # returned. Implicit assumption that owner
3505: # is a user in the domain in which the
3506: # course database is defined.
3507: # $client - The socket open on the client.
3508: # Returns:
3509: # 1 - Continue processing.
3510: # Side Effects:
3511: # a reply is written to $client.
3512: sub dump_course_id_handler {
3513: my ($cmd, $tail, $client) = @_;
3514:
3515: my $userinput = "$cmd:$tail";
3516:
3517: my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter) =split(/:/,$tail);
3518: if (defined($description)) {
3519: $description=&unescape($description);
3520: } else {
3521: $description='.';
3522: }
3523: if (defined($instcodefilter)) {
3524: $instcodefilter=&unescape($instcodefilter);
3525: } else {
3526: $instcodefilter='.';
3527: }
3528: if (defined($ownerfilter)) {
3529: $ownerfilter=&unescape($ownerfilter);
3530: } else {
3531: $ownerfilter='.';
3532: }
3533: if (defined($coursefilter)) {
3534: $coursefilter=&unescape($coursefilter);
3535: } else {
3536: $coursefilter='.';
3537: }
3538:
3539: unless (defined($since)) { $since=0; }
3540: my $qresult='';
3541: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3542: if ($hashref) {
3543: while (my ($key,$value) = each(%$hashref)) {
3544: my ($descr,$lasttime,$inst_code,$owner);
3545: my @courseitems = split(/:/,$value);
3546: $lasttime = pop(@courseitems);
3547: ($descr,$inst_code,$owner)=@courseitems;
3548: if ($lasttime<$since) { next; }
3549: my $match = 1;
3550: unless ($description eq '.') {
3551: my $unescapeDescr = &unescape($descr);
3552: unless (eval('$unescapeDescr=~/\Q$description\E/i')) {
3553: $match = 0;
3554: }
3555: }
3556: unless ($instcodefilter eq '.' || !defined($instcodefilter)) {
3557: my $unescapeInstcode = &unescape($inst_code);
3558: unless (eval('$unescapeInstcode=~/\Q$instcodefilter\E/i')) {
3559: $match = 0;
3560: }
3561: }
3562: unless ($ownerfilter eq '.' || !defined($ownerfilter)) {
3563: my $unescapeOwner = &unescape($owner);
3564: unless (eval('$unescapeOwner=~/\Q$ownerfilter\E/i')) {
3565: $match = 0;
3566: }
3567: }
3568: unless ($coursefilter eq '.' || !defined($coursefilter)) {
3569: my $unescapeCourse = &unescape($key);
3570: unless (eval('$unescapeCourse=~/^$udom(_)\Q$coursefilter\E$/')) {
3571: $match = 0;
3572: }
3573: }
3574: if ($match == 1) {
3575: $qresult.=$key.'='.$descr.':'.$inst_code.':'.$owner.'&';
3576: }
3577: }
3578: if (&untie_domain_hash($hashref)) {
3579: chop($qresult);
3580: &Reply($client, "$qresult\n", $userinput);
3581: } else {
3582: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3583: "while attempting courseiddump\n", $userinput);
3584: }
3585: } else {
3586: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3587: "while attempting courseiddump\n", $userinput);
3588: }
3589:
3590:
3591: return 1;
3592: }
3593: ®ister_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
3594:
3595: #
3596: # Puts an id to a domains id database.
3597: #
3598: # Parameters:
3599: # $cmd - The command that triggered us.
3600: # $tail - Remainder of the request other than the command. This is a
3601: # colon separated list containing:
3602: # $domain - The domain for which we are writing the id.
3603: # $pairs - The id info to write... this is and & separated list
3604: # of keyword=value.
3605: # $client - Socket open on the client.
3606: # Returns:
3607: # 1 - Continue processing.
3608: # Side effects:
3609: # reply is written to $client.
3610: #
3611: sub put_id_handler {
3612: my ($cmd,$tail,$client) = @_;
3613:
3614:
3615: my $userinput = "$cmd:$tail";
3616:
3617: my ($udom,$what)=split(/:/,$tail);
3618: chomp($what);
3619: my @pairs=split(/\&/,$what);
3620: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
3621: "P", $what);
3622: if ($hashref) {
3623: foreach my $pair (@pairs) {
3624: my ($key,$value)=split(/=/,$pair);
3625: $hashref->{$key}=$value;
3626: }
3627: if (&untie_domain_hash($hashref)) {
3628: &Reply($client, "ok\n", $userinput);
3629: } else {
3630: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3631: "while attempting idput\n", $userinput);
3632: }
3633: } else {
3634: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3635: "while attempting idput\n", $userinput);
3636: }
3637:
3638: return 1;
3639: }
3640: ®ister_handler("idput", \&put_id_handler, 0, 1, 0);
3641:
3642: #
3643: # Retrieves a set of id values from the id database.
3644: # Returns an & separated list of results, one for each requested id to the
3645: # client.
3646: #
3647: # Parameters:
3648: # $cmd - Command keyword that caused us to be dispatched.
3649: # $tail - Tail of the command. Consists of a colon separated:
3650: # domain - the domain whose id table we dump
3651: # ids Consists of an & separated list of
3652: # id keywords whose values will be fetched.
3653: # nonexisting keywords will have an empty value.
3654: # $client - Socket open on the client.
3655: #
3656: # Returns:
3657: # 1 - indicating processing should continue.
3658: # Side effects:
3659: # An & separated list of results is written to $client.
3660: #
3661: sub get_id_handler {
3662: my ($cmd, $tail, $client) = @_;
3663:
3664:
3665: my $userinput = "$client:$tail";
3666:
3667: my ($udom,$what)=split(/:/,$tail);
3668: chomp($what);
3669: my @queries=split(/\&/,$what);
3670: my $qresult='';
3671: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
3672: if ($hashref) {
3673: for (my $i=0;$i<=$#queries;$i++) {
3674: $qresult.="$hashref->{$queries[$i]}&";
3675: }
3676: if (&untie_domain_hash($hashref)) {
3677: $qresult=~s/\&$//;
3678: &Reply($client, "$qresult\n", $userinput);
3679: } else {
3680: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
3681: "while attempting idget\n",$userinput);
3682: }
3683: } else {
3684: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3685: "while attempting idget\n",$userinput);
3686: }
3687:
3688: return 1;
3689: }
3690: ®ister_handler("idget", \&get_id_handler, 0, 1, 0);
3691:
3692: #
3693: # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database
3694: #
3695: # Parameters
3696: # $cmd - Command keyword that caused us to be dispatched.
3697: # $tail - Tail of the command. Consists of a colon separated:
3698: # domain - the domain whose dcmail we are recording
3699: # email Consists of key=value pair
3700: # where key is unique msgid
3701: # and value is message (in XML)
3702: # $client - Socket open on the client.
3703: #
3704: # Returns:
3705: # 1 - indicating processing should continue.
3706: # Side effects
3707: # reply is written to $client.
3708: #
3709: sub put_dcmail_handler {
3710: my ($cmd,$tail,$client) = @_;
3711: my $userinput = "$cmd:$tail";
3712:
3713: my ($udom,$what)=split(/:/,$tail);
3714: chomp($what);
3715: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
3716: if ($hashref) {
3717: my ($key,$value)=split(/=/,$what);
3718: $hashref->{$key}=$value;
3719: }
3720: if (&untie_domain_hash($hashref)) {
3721: &Reply($client, "ok\n", $userinput);
3722: } else {
3723: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3724: "while attempting dcmailput\n", $userinput);
3725: }
3726: return 1;
3727: }
3728: ®ister_handler("dcmailput", \&put_dcmail_handler, 0, 1, 0);
3729:
3730: #
3731: # Retrieves broadcast e-mail from nohist_dcmail database
3732: # Returns to client an & separated list of key=value pairs,
3733: # where key is msgid and value is message information.
3734: #
3735: # Parameters
3736: # $cmd - Command keyword that caused us to be dispatched.
3737: # $tail - Tail of the command. Consists of a colon separated:
3738: # domain - the domain whose dcmail table we dump
3739: # startfilter - beginning of time window
3740: # endfilter - end of time window
3741: # sendersfilter - & separated list of username:domain
3742: # for senders to search for.
3743: # $client - Socket open on the client.
3744: #
3745: # Returns:
3746: # 1 - indicating processing should continue.
3747: # Side effects
3748: # reply (& separated list of msgid=messageinfo pairs) is
3749: # written to $client.
3750: #
3751: sub dump_dcmail_handler {
3752: my ($cmd, $tail, $client) = @_;
3753:
3754: my $userinput = "$cmd:$tail";
3755: my ($udom,$startfilter,$endfilter,$sendersfilter) = split(/:/,$tail);
3756: chomp($sendersfilter);
3757: my @senders = ();
3758: if (defined($startfilter)) {
3759: $startfilter=&unescape($startfilter);
3760: } else {
3761: $startfilter='.';
3762: }
3763: if (defined($endfilter)) {
3764: $endfilter=&unescape($endfilter);
3765: } else {
3766: $endfilter='.';
3767: }
3768: if (defined($sendersfilter)) {
3769: $sendersfilter=&unescape($sendersfilter);
3770: @senders = map { &unescape($_) } split(/\&/,$sendersfilter);
3771: }
3772:
3773: my $qresult='';
3774: my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
3775: if ($hashref) {
3776: while (my ($key,$value) = each(%$hashref)) {
3777: my $match = 1;
3778: my ($timestamp,$subj,$uname,$udom) =
3779: split(/:/,&unescape(&unescape($key)),5); # yes, twice really
3780: $subj = &unescape($subj);
3781: unless ($startfilter eq '.' || !defined($startfilter)) {
3782: if ($timestamp < $startfilter) {
3783: $match = 0;
3784: }
3785: }
3786: unless ($endfilter eq '.' || !defined($endfilter)) {
3787: if ($timestamp > $endfilter) {
3788: $match = 0;
3789: }
3790: }
3791: unless (@senders < 1) {
3792: unless (grep/^$uname:$udom$/,@senders) {
3793: $match = 0;
3794: }
3795: }
3796: if ($match == 1) {
3797: $qresult.=$key.'='.$value.'&';
3798: }
3799: }
3800: if (&untie_domain_hash($hashref)) {
3801: chop($qresult);
3802: &Reply($client, "$qresult\n", $userinput);
3803: } else {
3804: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3805: "while attempting dcmaildump\n", $userinput);
3806: }
3807: } else {
3808: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3809: "while attempting dcmaildump\n", $userinput);
3810: }
3811: return 1;
3812: }
3813:
3814: ®ister_handler("dcmaildump", \&dump_dcmail_handler, 0, 1, 0);
3815:
3816: #
3817: # Puts domain roles in nohist_domainroles database
3818: #
3819: # Parameters
3820: # $cmd - Command keyword that caused us to be dispatched.
3821: # $tail - Tail of the command. Consists of a colon separated:
3822: # domain - the domain whose roles we are recording
3823: # role - Consists of key=value pair
3824: # where key is unique role
3825: # and value is start/end date information
3826: # $client - Socket open on the client.
3827: #
3828: # Returns:
3829: # 1 - indicating processing should continue.
3830: # Side effects
3831: # reply is written to $client.
3832: #
3833:
3834: sub put_domainroles_handler {
3835: my ($cmd,$tail,$client) = @_;
3836:
3837: my $userinput = "$cmd:$tail";
3838: my ($udom,$what)=split(/:/,$tail);
3839: chomp($what);
3840: my @pairs=split(/\&/,$what);
3841: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
3842: if ($hashref) {
3843: foreach my $pair (@pairs) {
3844: my ($key,$value)=split(/=/,$pair);
3845: $hashref->{$key}=$value;
3846: }
3847: if (&untie_domain_hash($hashref)) {
3848: &Reply($client, "ok\n", $userinput);
3849: } else {
3850: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3851: "while attempting domroleput\n", $userinput);
3852: }
3853: } else {
3854: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3855: "while attempting domroleput\n", $userinput);
3856: }
3857:
3858: return 1;
3859: }
3860:
3861: ®ister_handler("domroleput", \&put_domainroles_handler, 0, 1, 0);
3862:
3863: #
3864: # Retrieves domain roles from nohist_domainroles database
3865: # Returns to client an & separated list of key=value pairs,
3866: # where key is role and value is start and end date information.
3867: #
3868: # Parameters
3869: # $cmd - Command keyword that caused us to be dispatched.
3870: # $tail - Tail of the command. Consists of a colon separated:
3871: # domain - the domain whose domain roles table we dump
3872: # $client - Socket open on the client.
3873: #
3874: # Returns:
3875: # 1 - indicating processing should continue.
3876: # Side effects
3877: # reply (& separated list of role=start/end info pairs) is
3878: # written to $client.
3879: #
3880: sub dump_domainroles_handler {
3881: my ($cmd, $tail, $client) = @_;
3882:
3883: my $userinput = "$cmd:$tail";
3884: my ($udom,$startfilter,$endfilter,$rolesfilter) = split(/:/,$tail);
3885: chomp($rolesfilter);
3886: my @roles = ();
3887: if (defined($startfilter)) {
3888: $startfilter=&unescape($startfilter);
3889: } else {
3890: $startfilter='.';
3891: }
3892: if (defined($endfilter)) {
3893: $endfilter=&unescape($endfilter);
3894: } else {
3895: $endfilter='.';
3896: }
3897: if (defined($rolesfilter)) {
3898: $rolesfilter=&unescape($rolesfilter);
3899: @roles = split(/\&/,$rolesfilter);
3900: }
3901:
3902: my $hashref = &tie_domain_hash($udom, "nohist_domainroles", &GDBM_WRCREAT());
3903: if ($hashref) {
3904: my $qresult = '';
3905: while (my ($key,$value) = each(%$hashref)) {
3906: my $match = 1;
3907: my ($start,$end) = split(/:/,&unescape($value));
3908: my ($trole,$uname,$udom,$runame,$rudom,$rsec) = split(/:/,&unescape($key));
3909: unless ($startfilter eq '.' || !defined($startfilter)) {
3910: if ($start >= $startfilter) {
3911: $match = 0;
3912: }
3913: }
3914: unless ($endfilter eq '.' || !defined($endfilter)) {
3915: if ($end <= $endfilter) {
3916: $match = 0;
3917: }
3918: }
3919: unless (@roles < 1) {
3920: unless (grep/^$trole$/,@roles) {
3921: $match = 0;
3922: }
3923: }
3924: if ($match == 1) {
3925: $qresult.=$key.'='.$value.'&';
3926: }
3927: }
3928: if (&untie_domain_hash($hashref)) {
3929: chop($qresult);
3930: &Reply($client, "$qresult\n", $userinput);
3931: } else {
3932: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3933: "while attempting domrolesdump\n", $userinput);
3934: }
3935: } else {
3936: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3937: "while attempting domrolesdump\n", $userinput);
3938: }
3939: return 1;
3940: }
3941:
3942: ®ister_handler("domrolesdump", \&dump_domainroles_handler, 0, 1, 0);
3943:
3944:
3945: # Process the tmpput command I'm not sure what this does.. Seems to
3946: # create a file in the lonDaemons/tmp directory of the form $id.tmp
3947: # where Id is the client's ip concatenated with a sequence number.
3948: # The file will contain some value that is passed in. Is this e.g.
3949: # a login token?
3950: #
3951: # Parameters:
3952: # $cmd - The command that got us dispatched.
3953: # $tail - The remainder of the request following $cmd:
3954: # In this case this will be the contents of the file.
3955: # $client - Socket connected to the client.
3956: # Returns:
3957: # 1 indicating processing can continue.
3958: # Side effects:
3959: # A file is created in the local filesystem.
3960: # A reply is sent to the client.
3961: sub tmp_put_handler {
3962: my ($cmd, $what, $client) = @_;
3963:
3964: my $userinput = "$cmd:$what"; # Reconstruct for logging.
3965:
3966:
3967: my $store;
3968: $tmpsnum++;
3969: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
3970: $id=~s/\W/\_/g;
3971: $what=~s/\n//g;
3972: my $execdir=$perlvar{'lonDaemons'};
3973: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
3974: print $store $what;
3975: close $store;
3976: &Reply($client, "$id\n", $userinput);
3977: } else {
3978: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3979: "while attempting tmpput\n", $userinput);
3980: }
3981: return 1;
3982:
3983: }
3984: ®ister_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
3985:
3986: # Processes the tmpget command. This command returns the contents
3987: # of a temporary resource file(?) created via tmpput.
3988: #
3989: # Paramters:
3990: # $cmd - Command that got us dispatched.
3991: # $id - Tail of the command, contain the id of the resource
3992: # we want to fetch.
3993: # $client - socket open on the client.
3994: # Return:
3995: # 1 - Inidcating processing can continue.
3996: # Side effects:
3997: # A reply is sent to the client.
3998: #
3999: sub tmp_get_handler {
4000: my ($cmd, $id, $client) = @_;
4001:
4002: my $userinput = "$cmd:$id";
4003:
4004:
4005: $id=~s/\W/\_/g;
4006: my $store;
4007: my $execdir=$perlvar{'lonDaemons'};
4008: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
4009: my $reply=<$store>;
4010: &Reply( $client, "$reply\n", $userinput);
4011: close $store;
4012: } else {
4013: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
4014: "while attempting tmpget\n", $userinput);
4015: }
4016:
4017: return 1;
4018: }
4019: ®ister_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
4020:
4021: #
4022: # Process the tmpdel command. This command deletes a temp resource
4023: # created by the tmpput command.
4024: #
4025: # Parameters:
4026: # $cmd - Command that got us here.
4027: # $id - Id of the temporary resource created.
4028: # $client - socket open on the client process.
4029: #
4030: # Returns:
4031: # 1 - Indicating processing should continue.
4032: # Side Effects:
4033: # A file is deleted
4034: # A reply is sent to the client.
4035: sub tmp_del_handler {
4036: my ($cmd, $id, $client) = @_;
4037:
4038: my $userinput= "$cmd:$id";
4039:
4040: chomp($id);
4041: $id=~s/\W/\_/g;
4042: my $execdir=$perlvar{'lonDaemons'};
4043: if (unlink("$execdir/tmp/$id.tmp")) {
4044: &Reply($client, "ok\n", $userinput);
4045: } else {
4046: &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
4047: "while attempting tmpdel\n", $userinput);
4048: }
4049:
4050: return 1;
4051:
4052: }
4053: ®ister_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
4054:
4055: #
4056: # Processes the setannounce command. This command
4057: # creates a file named announce.txt in the top directory of
4058: # the documentn root and sets its contents. The announce.txt file is
4059: # printed in its entirety at the LonCAPA login page. Note:
4060: # once the announcement.txt fileis created it cannot be deleted.
4061: # However, setting the contents of the file to empty removes the
4062: # announcement from the login page of loncapa so who cares.
4063: #
4064: # Parameters:
4065: # $cmd - The command that got us dispatched.
4066: # $announcement - The text of the announcement.
4067: # $client - Socket open on the client process.
4068: # Retunrns:
4069: # 1 - Indicating request processing should continue
4070: # Side Effects:
4071: # The file {DocRoot}/announcement.txt is created.
4072: # A reply is sent to $client.
4073: #
4074: sub set_announce_handler {
4075: my ($cmd, $announcement, $client) = @_;
4076:
4077: my $userinput = "$cmd:$announcement";
4078:
4079: chomp($announcement);
4080: $announcement=&unescape($announcement);
4081: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
4082: '/announcement.txt')) {
4083: print $store $announcement;
4084: close $store;
4085: &Reply($client, "ok\n", $userinput);
4086: } else {
4087: &Failure($client, "error: ".($!+0)."\n", $userinput);
4088: }
4089:
4090: return 1;
4091: }
4092: ®ister_handler("setannounce", \&set_announce_handler, 0, 1, 0);
4093:
4094: #
4095: # Return the version of the daemon. This can be used to determine
4096: # the compatibility of cross version installations or, alternatively to
4097: # simply know who's out of date and who isn't. Note that the version
4098: # is returned concatenated with the tail.
4099: # Parameters:
4100: # $cmd - the request that dispatched to us.
4101: # $tail - Tail of the request (client's version?).
4102: # $client - Socket open on the client.
4103: #Returns:
4104: # 1 - continue processing requests.
4105: # Side Effects:
4106: # Replies with version to $client.
4107: sub get_version_handler {
4108: my ($cmd, $tail, $client) = @_;
4109:
4110: my $userinput = $cmd.$tail;
4111:
4112: &Reply($client, &version($userinput)."\n", $userinput);
4113:
4114:
4115: return 1;
4116: }
4117: ®ister_handler("version", \&get_version_handler, 0, 1, 0);
4118:
4119: # Set the current host and domain. This is used to support
4120: # multihomed systems. Each IP of the system, or even separate daemons
4121: # on the same IP can be treated as handling a separate lonCAPA virtual
4122: # machine. This command selects the virtual lonCAPA. The client always
4123: # knows the right one since it is lonc and it is selecting the domain/system
4124: # from the hosts.tab file.
4125: # Parameters:
4126: # $cmd - Command that dispatched us.
4127: # $tail - Tail of the command (domain/host requested).
4128: # $socket - Socket open on the client.
4129: #
4130: # Returns:
4131: # 1 - Indicates the program should continue to process requests.
4132: # Side-effects:
4133: # The default domain/system context is modified for this daemon.
4134: # a reply is sent to the client.
4135: #
4136: sub set_virtual_host_handler {
4137: my ($cmd, $tail, $socket) = @_;
4138:
4139: my $userinput ="$cmd:$tail";
4140:
4141: &Reply($client, &sethost($userinput)."\n", $userinput);
4142:
4143:
4144: return 1;
4145: }
4146: ®ister_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
4147:
4148: # Process a request to exit:
4149: # - "bye" is sent to the client.
4150: # - The client socket is shutdown and closed.
4151: # - We indicate to the caller that we should exit.
4152: # Formal Parameters:
4153: # $cmd - The command that got us here.
4154: # $tail - Tail of the command (empty).
4155: # $client - Socket open on the tail.
4156: # Returns:
4157: # 0 - Indicating the program should exit!!
4158: #
4159: sub exit_handler {
4160: my ($cmd, $tail, $client) = @_;
4161:
4162: my $userinput = "$cmd:$tail";
4163:
4164: &logthis("Client $clientip ($clientname) hanging up: $userinput");
4165: &Reply($client, "bye\n", $userinput);
4166: $client->shutdown(2); # shutdown the socket forcibly.
4167: $client->close();
4168:
4169: return 0;
4170: }
4171: ®ister_handler("exit", \&exit_handler, 0,1,1);
4172: ®ister_handler("init", \&exit_handler, 0,1,1);
4173: ®ister_handler("quit", \&exit_handler, 0,1,1);
4174:
4175: # Determine if auto-enrollment is enabled.
4176: # Note that the original had what I believe to be a defect.
4177: # The original returned 0 if the requestor was not a registerd client.
4178: # It should return "refused".
4179: # Formal Parameters:
4180: # $cmd - The command that invoked us.
4181: # $tail - The tail of the command (Extra command parameters.
4182: # $client - The socket open on the client that issued the request.
4183: # Returns:
4184: # 1 - Indicating processing should continue.
4185: #
4186: sub enrollment_enabled_handler {
4187: my ($cmd, $tail, $client) = @_;
4188: my $userinput = $cmd.":".$tail; # For logging purposes.
4189:
4190:
4191: my $cdom = split(/:/, $tail); # Domain we're asking about.
4192: my $outcome = &localenroll::run($cdom);
4193: &Reply($client, "$outcome\n", $userinput);
4194:
4195: return 1;
4196: }
4197: ®ister_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
4198:
4199: # Get the official sections for which auto-enrollment is possible.
4200: # Since the admin people won't know about 'unofficial sections'
4201: # we cannot auto-enroll on them.
4202: # Formal Parameters:
4203: # $cmd - The command request that got us dispatched here.
4204: # $tail - The remainder of the request. In our case this
4205: # will be split into:
4206: # $coursecode - The course name from the admin point of view.
4207: # $cdom - The course's domain(?).
4208: # $client - Socket open on the client.
4209: # Returns:
4210: # 1 - Indiciting processing should continue.
4211: #
4212: sub get_sections_handler {
4213: my ($cmd, $tail, $client) = @_;
4214: my $userinput = "$cmd:$tail";
4215:
4216: my ($coursecode, $cdom) = split(/:/, $tail);
4217: my @secs = &localenroll::get_sections($coursecode,$cdom);
4218: my $seclist = &escape(join(':',@secs));
4219:
4220: &Reply($client, "$seclist\n", $userinput);
4221:
4222:
4223: return 1;
4224: }
4225: ®ister_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
4226:
4227: # Validate the owner of a new course section.
4228: #
4229: # Formal Parameters:
4230: # $cmd - Command that got us dispatched.
4231: # $tail - the remainder of the command. For us this consists of a
4232: # colon separated string containing:
4233: # $inst - Course Id from the institutions point of view.
4234: # $owner - Proposed owner of the course.
4235: # $cdom - Domain of the course (from the institutions
4236: # point of view?)..
4237: # $client - Socket open on the client.
4238: #
4239: # Returns:
4240: # 1 - Processing should continue.
4241: #
4242: sub validate_course_owner_handler {
4243: my ($cmd, $tail, $client) = @_;
4244: my $userinput = "$cmd:$tail";
4245: my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
4246:
4247: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
4248: &Reply($client, "$outcome\n", $userinput);
4249:
4250:
4251:
4252: return 1;
4253: }
4254: ®ister_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
4255:
4256: #
4257: # Validate a course section in the official schedule of classes
4258: # from the institutions point of view (part of autoenrollment).
4259: #
4260: # Formal Parameters:
4261: # $cmd - The command request that got us dispatched.
4262: # $tail - The tail of the command. In this case,
4263: # this is a colon separated set of words that will be split
4264: # into:
4265: # $inst_course_id - The course/section id from the
4266: # institutions point of view.
4267: # $cdom - The domain from the institutions
4268: # point of view.
4269: # $client - Socket open on the client.
4270: # Returns:
4271: # 1 - Indicating processing should continue.
4272: #
4273: sub validate_course_section_handler {
4274: my ($cmd, $tail, $client) = @_;
4275: my $userinput = "$cmd:$tail";
4276: my ($inst_course_id, $cdom) = split(/:/, $tail);
4277:
4278: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
4279: &Reply($client, "$outcome\n", $userinput);
4280:
4281:
4282: return 1;
4283: }
4284: ®ister_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
4285:
4286: #
4287: # Create a password for a new auto-enrollment user.
4288: # I think/guess, this password allows access to the institutions
4289: # AIS class list server/services. Stuart can correct this comment
4290: # when he finds out how wrong I am.
4291: #
4292: # Formal Parameters:
4293: # $cmd - The command request that got us dispatched.
4294: # $tail - The tail of the command. In this case this is a colon separated
4295: # set of words that will be split into:
4296: # $authparam - An authentication parameter (username??).
4297: # $cdom - The domain of the course from the institution's
4298: # point of view.
4299: # $client - The socket open on the client.
4300: # Returns:
4301: # 1 - continue processing.
4302: #
4303: sub create_auto_enroll_password_handler {
4304: my ($cmd, $tail, $client) = @_;
4305: my $userinput = "$cmd:$tail";
4306:
4307: my ($authparam, $cdom) = split(/:/, $userinput);
4308:
4309: my ($create_passwd,$authchk);
4310: ($authparam,
4311: $create_passwd,
4312: $authchk) = &localenroll::create_password($authparam,$cdom);
4313:
4314: &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
4315: $userinput);
4316:
4317:
4318: return 1;
4319: }
4320: ®ister_handler("autocreatepassword", \&create_auto_enroll_password_handler,
4321: 0, 1, 0);
4322:
4323: # Retrieve and remove temporary files created by/during autoenrollment.
4324: #
4325: # Formal Parameters:
4326: # $cmd - The command that got us dispatched.
4327: # $tail - The tail of the command. In our case this is a colon
4328: # separated list that will be split into:
4329: # $filename - The name of the file to remove.
4330: # The filename is given as a path relative to
4331: # the LonCAPA temp file directory.
4332: # $client - Socket open on the client.
4333: #
4334: # Returns:
4335: # 1 - Continue processing.
4336: sub retrieve_auto_file_handler {
4337: my ($cmd, $tail, $client) = @_;
4338: my $userinput = "cmd:$tail";
4339:
4340: my ($filename) = split(/:/, $tail);
4341:
4342: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
4343: if ( (-e $source) && ($filename ne '') ) {
4344: my $reply = '';
4345: if (open(my $fh,$source)) {
4346: while (<$fh>) {
4347: chomp($_);
4348: $_ =~ s/^\s+//g;
4349: $_ =~ s/\s+$//g;
4350: $reply .= $_;
4351: }
4352: close($fh);
4353: &Reply($client, &escape($reply)."\n", $userinput);
4354:
4355: # Does this have to be uncommented??!? (RF).
4356: #
4357: # unlink($source);
4358: } else {
4359: &Failure($client, "error\n", $userinput);
4360: }
4361: } else {
4362: &Failure($client, "error\n", $userinput);
4363: }
4364:
4365:
4366: return 1;
4367: }
4368: ®ister_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
4369:
4370: #
4371: # Read and retrieve institutional code format (for support form).
4372: # Formal Parameters:
4373: # $cmd - Command that dispatched us.
4374: # $tail - Tail of the command. In this case it conatins
4375: # the course domain and the coursename.
4376: # $client - Socket open on the client.
4377: # Returns:
4378: # 1 - Continue processing.
4379: #
4380: sub get_institutional_code_format_handler {
4381: my ($cmd, $tail, $client) = @_;
4382: my $userinput = "$cmd:$tail";
4383:
4384: my $reply;
4385: my($cdom,$course) = split(/:/,$tail);
4386: my @pairs = split/\&/,$course;
4387: my %instcodes = ();
4388: my %codes = ();
4389: my @codetitles = ();
4390: my %cat_titles = ();
4391: my %cat_order = ();
4392: foreach (@pairs) {
4393: my ($key,$value) = split/=/,$_;
4394: $instcodes{&unescape($key)} = &unescape($value);
4395: }
4396: my $formatreply = &localenroll::instcode_format($cdom,
4397: \%instcodes,
4398: \%codes,
4399: \@codetitles,
4400: \%cat_titles,
4401: \%cat_order);
4402: if ($formatreply eq 'ok') {
4403: my $codes_str = &hash2str(%codes);
4404: my $codetitles_str = &array2str(@codetitles);
4405: my $cat_titles_str = &hash2str(%cat_titles);
4406: my $cat_order_str = &hash2str(%cat_order);
4407: &Reply($client,
4408: $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
4409: .$cat_order_str."\n",
4410: $userinput);
4411: } else {
4412: # this else branch added by RF since if not ok, lonc will
4413: # hang waiting on reply until timeout.
4414: #
4415: &Reply($client, "format_error\n", $userinput);
4416: }
4417:
4418: return 1;
4419: }
4420: ®ister_handler("autoinstcodeformat",
4421: \&get_institutional_code_format_handler,0,1,0);
4422:
4423: # Get domain specific conditions for import of student photographs to a course
4424: #
4425: # Retrieves information from photo_permission subroutine in localenroll.
4426: # Returns outcome (ok) if no processing errors, and whether course owner is
4427: # required to accept conditions of use (yes/no).
4428: #
4429: #
4430: sub photo_permission_handler {
4431: my ($cmd, $tail, $client) = @_;
4432: my $userinput = "$cmd:$tail";
4433: my $cdom = $tail;
4434: my ($perm_reqd,$conditions);
4435: my $outcome;
4436: eval {
4437: local($SIG{__DIE__})='DEFAULT';
4438: $outcome = &localenroll::photo_permission($cdom,\$perm_reqd,
4439: \$conditions);
4440: };
4441: if (!$@) {
4442: &Reply($client, &escape($outcome.':'.$perm_reqd.':'. $conditions)."\n",
4443: $userinput);
4444: } else {
4445: &Failure($client,"unknown_cmd\n",$userinput);
4446: }
4447: return 1;
4448: }
4449: ®ister_handler("autophotopermission",\&photo_permission_handler,0,1,0);
4450:
4451: #
4452: # Checks if student photo is available for a user in the domain, in the user's
4453: # directory (in /userfiles/internal/studentphoto.jpg).
4454: # Uses localstudentphoto:fetch() to ensure there is an up to date copy of
4455: # the student's photo.
4456:
4457: sub photo_check_handler {
4458: my ($cmd, $tail, $client) = @_;
4459: my $userinput = "$cmd:$tail";
4460: my ($udom,$uname,$pid) = split(/:/,$tail);
4461: $udom = &unescape($udom);
4462: $uname = &unescape($uname);
4463: $pid = &unescape($pid);
4464: my $path=&propath($udom,$uname).'/userfiles/internal/';
4465: if (!-e $path) {
4466: &mkpath($path);
4467: }
4468: my $response;
4469: my $result = &localstudentphoto::fetch($udom,$uname,$pid,\$response);
4470: $result .= ':'.$response;
4471: &Reply($client, &escape($result)."\n",$userinput);
4472: return 1;
4473: }
4474: ®ister_handler("autophotocheck",\&photo_check_handler,0,1,0);
4475:
4476: #
4477: # Retrieve information from localenroll about whether to provide a button
4478: # for users who have enbled import of student photos to initiate an
4479: # update of photo files for registered students. Also include
4480: # comment to display alongside button.
4481:
4482: sub photo_choice_handler {
4483: my ($cmd, $tail, $client) = @_;
4484: my $userinput = "$cmd:$tail";
4485: my $cdom = &unescape($tail);
4486: my ($update,$comment);
4487: eval {
4488: local($SIG{__DIE__})='DEFAULT';
4489: ($update,$comment) = &localenroll::manager_photo_update($cdom);
4490: };
4491: if (!$@) {
4492: &Reply($client,&escape($update).':'.&escape($comment)."\n",$userinput);
4493: } else {
4494: &Failure($client,"unknown_cmd\n",$userinput);
4495: }
4496: return 1;
4497: }
4498: ®ister_handler("autophotochoice",\&photo_choice_handler,0,1,0);
4499:
4500: #
4501: # Gets a student's photo to exist (in the correct image type) in the user's
4502: # directory.
4503: # Formal Parameters:
4504: # $cmd - The command request that got us dispatched.
4505: # $tail - A colon separated set of words that will be split into:
4506: # $domain - student's domain
4507: # $uname - student username
4508: # $type - image type desired
4509: # $client - The socket open on the client.
4510: # Returns:
4511: # 1 - continue processing.
4512:
4513: sub student_photo_handler {
4514: my ($cmd, $tail, $client) = @_;
4515: my ($domain,$uname,$ext,$type) = split(/:/, $tail);
4516:
4517: my $path=&propath($domain,$uname). '/userfiles/internal/';
4518: my $filename = 'studentphoto.'.$ext;
4519: if ($type eq 'thumbnail') {
4520: $filename = 'studentphoto_tn.'.$ext;
4521: }
4522: if (-e $path.$filename) {
4523: &Reply($client,"ok\n","$cmd:$tail");
4524: return 1;
4525: }
4526: &mkpath($path);
4527: my $file;
4528: if ($type eq 'thumbnail') {
4529: eval {
4530: local($SIG{__DIE__})='DEFAULT';
4531: $file=&localstudentphoto::fetch_thumbnail($domain,$uname);
4532: };
4533: } else {
4534: $file=&localstudentphoto::fetch($domain,$uname);
4535: }
4536: if (!$file) {
4537: &Failure($client,"unavailable\n","$cmd:$tail");
4538: return 1;
4539: }
4540: if (!-e $path.$filename) { &convert_photo($file,$path.$filename); }
4541: if (-e $path.$filename) {
4542: &Reply($client,"ok\n","$cmd:$tail");
4543: return 1;
4544: }
4545: &Failure($client,"unable_to_convert\n","$cmd:$tail");
4546: return 1;
4547: }
4548: ®ister_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
4549:
4550: # mkpath makes all directories for a file, expects an absolute path with a
4551: # file or a trailing / if just a dir is passed
4552: # returns 1 on success 0 on failure
4553: sub mkpath {
4554: my ($file)=@_;
4555: my @parts=split(/\//,$file,-1);
4556: my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
4557: for (my $i=3;$i<= ($#parts-1);$i++) {
4558: $now.='/'.$parts[$i];
4559: if (!-e $now) {
4560: if (!mkdir($now,0770)) { return 0; }
4561: }
4562: }
4563: return 1;
4564: }
4565:
4566: #---------------------------------------------------------------
4567: #
4568: # Getting, decoding and dispatching requests:
4569: #
4570: #
4571: # Get a Request:
4572: # Gets a Request message from the client. The transaction
4573: # is defined as a 'line' of text. We remove the new line
4574: # from the text line.
4575: #
4576: sub get_request {
4577: my $input = <$client>;
4578: chomp($input);
4579:
4580: &Debug("get_request: Request = $input\n");
4581:
4582: &status('Processing '.$clientname.':'.$input);
4583:
4584: return $input;
4585: }
4586: #---------------------------------------------------------------
4587: #
4588: # Process a request. This sub should shrink as each action
4589: # gets farmed out into a separat sub that is registered
4590: # with the dispatch hash.
4591: #
4592: # Parameters:
4593: # user_input - The request received from the client (lonc).
4594: # Returns:
4595: # true to keep processing, false if caller should exit.
4596: #
4597: sub process_request {
4598: my ($userinput) = @_; # Easier for now to break style than to
4599: # fix all the userinput -> user_input.
4600: my $wasenc = 0; # True if request was encrypted.
4601: # ------------------------------------------------------------ See if encrypted
4602: # for command
4603: # sethost:<server>
4604: # <command>:<args>
4605: # we just send it to the processor
4606: # for
4607: # sethost:<server>:<command>:<args>
4608: # we do the implict set host and then do the command
4609: if ($userinput =~ /^sethost:/) {
4610: (my $cmd,my $newid,$userinput) = split(':',$userinput,3);
4611: if (defined($userinput)) {
4612: &sethost("$cmd:$newid");
4613: } else {
4614: $userinput = "$cmd:$newid";
4615: }
4616: }
4617:
4618: if ($userinput =~ /^enc/) {
4619: $userinput = decipher($userinput);
4620: $wasenc=1;
4621: if(!$userinput) { # Cipher not defined.
4622: &Failure($client, "error: Encrypted data without negotated key\n");
4623: return 0;
4624: }
4625: }
4626: Debug("process_request: $userinput\n");
4627:
4628: #
4629: # The 'correct way' to add a command to lond is now to
4630: # write a sub to execute it and Add it to the command dispatch
4631: # hash via a call to register_handler.. The comments to that
4632: # sub should give you enough to go on to show how to do this
4633: # along with the examples that are building up as this code
4634: # is getting refactored. Until all branches of the
4635: # if/elseif monster below have been factored out into
4636: # separate procesor subs, if the dispatch hash is missing
4637: # the command keyword, we will fall through to the remainder
4638: # of the if/else chain below in order to keep this thing in
4639: # working order throughout the transmogrification.
4640:
4641: my ($command, $tail) = split(/:/, $userinput, 2);
4642: chomp($command);
4643: chomp($tail);
4644: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
4645: $command =~ s/(\r)//; # And this too for parameterless commands.
4646: if(!$tail) {
4647: $tail =""; # defined but blank.
4648: }
4649:
4650: &Debug("Command received: $command, encoded = $wasenc");
4651:
4652: if(defined $Dispatcher{$command}) {
4653:
4654: my $dispatch_info = $Dispatcher{$command};
4655: my $handler = $$dispatch_info[0];
4656: my $need_encode = $$dispatch_info[1];
4657: my $client_types = $$dispatch_info[2];
4658: Debug("Matched dispatch hash: mustencode: $need_encode "
4659: ."ClientType $client_types");
4660:
4661: # Validate the request:
4662:
4663: my $ok = 1;
4664: my $requesterprivs = 0;
4665: if(&isClient()) {
4666: $requesterprivs |= $CLIENT_OK;
4667: }
4668: if(&isManager()) {
4669: $requesterprivs |= $MANAGER_OK;
4670: }
4671: if($need_encode && (!$wasenc)) {
4672: Debug("Must encode but wasn't: $need_encode $wasenc");
4673: $ok = 0;
4674: }
4675: if(($client_types & $requesterprivs) == 0) {
4676: Debug("Client not privileged to do this operation");
4677: $ok = 0;
4678: }
4679:
4680: if($ok) {
4681: Debug("Dispatching to handler $command $tail");
4682: my $keep_going = &$handler($command, $tail, $client);
4683: return $keep_going;
4684: } else {
4685: Debug("Refusing to dispatch because client did not match requirements");
4686: Failure($client, "refused\n", $userinput);
4687: return 1;
4688: }
4689:
4690: }
4691:
4692: print $client "unknown_cmd\n";
4693: # -------------------------------------------------------------------- complete
4694: Debug("process_request - returning 1");
4695: return 1;
4696: }
4697: #
4698: # Decipher encoded traffic
4699: # Parameters:
4700: # input - Encoded data.
4701: # Returns:
4702: # Decoded data or undef if encryption key was not yet negotiated.
4703: # Implicit input:
4704: # cipher - This global holds the negotiated encryption key.
4705: #
4706: sub decipher {
4707: my ($input) = @_;
4708: my $output = '';
4709:
4710:
4711: if($cipher) {
4712: my($enc, $enclength, $encinput) = split(/:/, $input);
4713: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
4714: $output .=
4715: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
4716: }
4717: return substr($output, 0, $enclength);
4718: } else {
4719: return undef;
4720: }
4721: }
4722:
4723: #
4724: # Register a command processor. This function is invoked to register a sub
4725: # to process a request. Once registered, the ProcessRequest sub can automatically
4726: # dispatch requests to an appropriate sub, and do the top level validity checking
4727: # as well:
4728: # - Is the keyword recognized.
4729: # - Is the proper client type attempting the request.
4730: # - Is the request encrypted if it has to be.
4731: # Parameters:
4732: # $request_name - Name of the request being registered.
4733: # This is the command request that will match
4734: # against the hash keywords to lookup the information
4735: # associated with the dispatch information.
4736: # $procedure - Reference to a sub to call to process the request.
4737: # All subs get called as follows:
4738: # Procedure($cmd, $tail, $replyfd, $key)
4739: # $cmd - the actual keyword that invoked us.
4740: # $tail - the tail of the request that invoked us.
4741: # $replyfd- File descriptor connected to the client
4742: # $must_encode - True if the request must be encoded to be good.
4743: # $client_ok - True if it's ok for a client to request this.
4744: # $manager_ok - True if it's ok for a manager to request this.
4745: # Side effects:
4746: # - On success, the Dispatcher hash has an entry added for the key $RequestName
4747: # - On failure, the program will die as it's a bad internal bug to try to
4748: # register a duplicate command handler.
4749: #
4750: sub register_handler {
4751: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
4752:
4753: # Don't allow duplication#
4754:
4755: if (defined $Dispatcher{$request_name}) {
4756: die "Attempting to define a duplicate request handler for $request_name\n";
4757: }
4758: # Build the client type mask:
4759:
4760: my $client_type_mask = 0;
4761: if($client_ok) {
4762: $client_type_mask |= $CLIENT_OK;
4763: }
4764: if($manager_ok) {
4765: $client_type_mask |= $MANAGER_OK;
4766: }
4767:
4768: # Enter the hash:
4769:
4770: my @entry = ($procedure, $must_encode, $client_type_mask);
4771:
4772: $Dispatcher{$request_name} = \@entry;
4773:
4774: }
4775:
4776:
4777: #------------------------------------------------------------------
4778:
4779:
4780:
4781:
4782: #
4783: # Convert an error return code from lcpasswd to a string value.
4784: #
4785: sub lcpasswdstrerror {
4786: my $ErrorCode = shift;
4787: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
4788: return "lcpasswd Unrecognized error return value ".$ErrorCode;
4789: } else {
4790: return $passwderrors[$ErrorCode];
4791: }
4792: }
4793:
4794: #
4795: # Convert an error return code from lcuseradd to a string value:
4796: #
4797: sub lcuseraddstrerror {
4798: my $ErrorCode = shift;
4799: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
4800: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
4801: } else {
4802: return $adderrors[$ErrorCode];
4803: }
4804: }
4805:
4806: # grabs exception and records it to log before exiting
4807: sub catchexception {
4808: my ($error)=@_;
4809: $SIG{'QUIT'}='DEFAULT';
4810: $SIG{__DIE__}='DEFAULT';
4811: &status("Catching exception");
4812: &logthis("<font color='red'>CRITICAL: "
4813: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
4814: ."a crash with this error msg->[$error]</font>");
4815: &logthis('Famous last words: '.$status.' - '.$lastlog);
4816: if ($client) { print $client "error: $error\n"; }
4817: $server->close();
4818: die($error);
4819: }
4820: sub timeout {
4821: &status("Handling Timeout");
4822: &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
4823: &catchexception('Timeout');
4824: }
4825: # -------------------------------- Set signal handlers to record abnormal exits
4826:
4827:
4828: $SIG{'QUIT'}=\&catchexception;
4829: $SIG{__DIE__}=\&catchexception;
4830:
4831: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
4832: &status("Read loncapa.conf and loncapa_apache.conf");
4833: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
4834: %perlvar=%{$perlvarref};
4835: undef $perlvarref;
4836:
4837: # ----------------------------- Make sure this process is running from user=www
4838: my $wwwid=getpwnam('www');
4839: if ($wwwid!=$<) {
4840: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4841: my $subj="LON: $currenthostid User ID mismatch";
4842: system("echo 'User ID mismatch. lond must be run as user www.' |\
4843: mailto $emailto -s '$subj' > /dev/null");
4844: exit 1;
4845: }
4846:
4847: # --------------------------------------------- Check if other instance running
4848:
4849: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
4850:
4851: if (-e $pidfile) {
4852: my $lfh=IO::File->new("$pidfile");
4853: my $pide=<$lfh>;
4854: chomp($pide);
4855: if (kill 0 => $pide) { die "already running"; }
4856: }
4857:
4858: # ------------------------------------------------------------- Read hosts file
4859:
4860:
4861:
4862: # establish SERVER socket, bind and listen.
4863: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
4864: Type => SOCK_STREAM,
4865: Proto => 'tcp',
4866: Reuse => 1,
4867: Listen => 10 )
4868: or die "making socket: $@\n";
4869:
4870: # --------------------------------------------------------- Do global variables
4871:
4872: # global variables
4873:
4874: my %children = (); # keys are current child process IDs
4875:
4876: sub REAPER { # takes care of dead children
4877: $SIG{CHLD} = \&REAPER;
4878: &status("Handling child death");
4879: my $pid;
4880: do {
4881: $pid = waitpid(-1,&WNOHANG());
4882: if (defined($children{$pid})) {
4883: &logthis("Child $pid died");
4884: delete($children{$pid});
4885: } elsif ($pid > 0) {
4886: &logthis("Unknown Child $pid died");
4887: }
4888: } while ( $pid > 0 );
4889: foreach my $child (keys(%children)) {
4890: $pid = waitpid($child,&WNOHANG());
4891: if ($pid > 0) {
4892: &logthis("Child $child - $pid looks like we missed it's death");
4893: delete($children{$pid});
4894: }
4895: }
4896: &status("Finished Handling child death");
4897: }
4898:
4899: sub HUNTSMAN { # signal handler for SIGINT
4900: &status("Killing children (INT)");
4901: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4902: kill 'INT' => keys %children;
4903: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4904: my $execdir=$perlvar{'lonDaemons'};
4905: unlink("$execdir/logs/lond.pid");
4906: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
4907: &status("Done killing children");
4908: exit; # clean up with dignity
4909: }
4910:
4911: sub HUPSMAN { # signal handler for SIGHUP
4912: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4913: &status("Killing children for restart (HUP)");
4914: kill 'INT' => keys %children;
4915: &logthis("Free socket: ".shutdown($server,2)); # free up socket
4916: &logthis("<font color='red'>CRITICAL: Restarting</font>");
4917: my $execdir=$perlvar{'lonDaemons'};
4918: unlink("$execdir/logs/lond.pid");
4919: &status("Restarting self (HUP)");
4920: exec("$execdir/lond"); # here we go again
4921: }
4922:
4923: #
4924: # Kill off hashes that describe the host table prior to re-reading it.
4925: # Hashes affected are:
4926: # %hostid, %hostdom %hostip %hostdns.
4927: #
4928: sub KillHostHashes {
4929: foreach my $key (keys %hostid) {
4930: delete $hostid{$key};
4931: }
4932: foreach my $key (keys %hostdom) {
4933: delete $hostdom{$key};
4934: }
4935: foreach my $key (keys %hostip) {
4936: delete $hostip{$key};
4937: }
4938: foreach my $key (keys %hostdns) {
4939: delete $hostdns{$key};
4940: }
4941: }
4942: #
4943: # Read in the host table from file and distribute it into the various hashes:
4944: #
4945: # - %hostid - Indexed by IP, the loncapa hostname.
4946: # - %hostdom - Indexed by loncapa hostname, the domain.
4947: # - %hostip - Indexed by hostid, the Ip address of the host.
4948: sub ReadHostTable {
4949:
4950: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
4951: my $myloncapaname = $perlvar{'lonHostID'};
4952: Debug("My loncapa name is : $myloncapaname");
4953: my %name_to_ip;
4954: while (my $configline=<CONFIG>) {
4955: if ($configline !~ /^\s*\#/ && $configline !~ /^\s*$/ ) {
4956: my ($id,$domain,$role,$name)=split(/:/,$configline);
4957: $name=~s/\s//g;
4958: my $ip;
4959: if (!exists($name_to_ip{$name})) {
4960: $ip = gethostbyname($name);
4961: if (!$ip || length($ip) ne 4) {
4962: &logthis("Skipping host $id name $name no IP found\n");
4963: next;
4964: }
4965: $ip=inet_ntoa($ip);
4966: $name_to_ip{$name} = $ip;
4967: } else {
4968: $ip = $name_to_ip{$name};
4969: }
4970: $hostid{$ip}=$id; # LonCAPA name of host by IP.
4971: $hostdom{$id}=$domain; # LonCAPA domain name of host.
4972: $hostname{$id}=$name; # LonCAPA name -> DNS name
4973: $hostip{$id}=$ip; # IP address of host.
4974: $hostdns{$name} = $id; # LonCAPA name of host by DNS.
4975:
4976: if ($id eq $perlvar{'lonHostID'}) {
4977: Debug("Found me in the host table: $name");
4978: $thisserver=$name;
4979: }
4980: }
4981: }
4982: close(CONFIG);
4983: }
4984: #
4985: # Reload the Apache daemon's state.
4986: # This is done by invoking /home/httpd/perl/apachereload
4987: # a setuid perl script that can be root for us to do this job.
4988: #
4989: sub ReloadApache {
4990: my $execdir = $perlvar{'lonDaemons'};
4991: my $script = $execdir."/apachereload";
4992: system($script);
4993: }
4994:
4995: #
4996: # Called in response to a USR2 signal.
4997: # - Reread hosts.tab
4998: # - All children connected to hosts that were removed from hosts.tab
4999: # are killed via SIGINT
5000: # - All children connected to previously existing hosts are sent SIGUSR1
5001: # - Our internal hosts hash is updated to reflect the new contents of
5002: # hosts.tab causing connections from hosts added to hosts.tab to
5003: # now be honored.
5004: #
5005: sub UpdateHosts {
5006: &status("Reload hosts.tab");
5007: logthis('<font color="blue"> Updating connections </font>');
5008: #
5009: # The %children hash has the set of IP's we currently have children
5010: # on. These need to be matched against records in the hosts.tab
5011: # Any ip's no longer in the table get killed off they correspond to
5012: # either dropped or changed hosts. Note that the re-read of the table
5013: # will take care of new and changed hosts as connections come into being.
5014:
5015:
5016: KillHostHashes;
5017: ReadHostTable;
5018:
5019: foreach my $child (keys %children) {
5020: my $childip = $children{$child};
5021: if(!$hostid{$childip}) {
5022: logthis('<font color="blue"> UpdateHosts killing child '
5023: ." $child for ip $childip </font>");
5024: kill('INT', $child);
5025: } else {
5026: logthis('<font color="green"> keeping child for ip '
5027: ." $childip (pid=$child) </font>");
5028: }
5029: }
5030: ReloadApache;
5031: &status("Finished reloading hosts.tab");
5032: }
5033:
5034:
5035: sub checkchildren {
5036: &status("Checking on the children (sending signals)");
5037: &initnewstatus();
5038: &logstatus();
5039: &logthis('Going to check on the children');
5040: my $docdir=$perlvar{'lonDocRoot'};
5041: foreach (sort keys %children) {
5042: #sleep 1;
5043: unless (kill 'USR1' => $_) {
5044: &logthis ('Child '.$_.' is dead');
5045: &logstatus($$.' is dead');
5046: delete($children{$_});
5047: }
5048: }
5049: sleep 5;
5050: $SIG{ALRM} = sub { Debug("timeout");
5051: die "timeout"; };
5052: $SIG{__DIE__} = 'DEFAULT';
5053: &status("Checking on the children (waiting for reports)");
5054: foreach (sort keys %children) {
5055: unless (-e "$docdir/lon-status/londchld/$_.txt") {
5056: eval {
5057: alarm(300);
5058: &logthis('Child '.$_.' did not respond');
5059: kill 9 => $_;
5060: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
5061: #$subj="LON: $currenthostid killed lond process $_";
5062: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
5063: #$execdir=$perlvar{'lonDaemons'};
5064: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
5065: delete($children{$_});
5066: alarm(0);
5067: }
5068: }
5069: }
5070: $SIG{ALRM} = 'DEFAULT';
5071: $SIG{__DIE__} = \&catchexception;
5072: &status("Finished checking children");
5073: &logthis('Finished Checking children');
5074: }
5075:
5076: # --------------------------------------------------------------------- Logging
5077:
5078: sub logthis {
5079: my $message=shift;
5080: my $execdir=$perlvar{'lonDaemons'};
5081: my $fh=IO::File->new(">>$execdir/logs/lond.log");
5082: my $now=time;
5083: my $local=localtime($now);
5084: $lastlog=$local.': '.$message;
5085: print $fh "$local ($$): $message\n";
5086: }
5087:
5088: # ------------------------- Conditional log if $DEBUG true.
5089: sub Debug {
5090: my $message = shift;
5091: if($DEBUG) {
5092: &logthis($message);
5093: }
5094: }
5095:
5096: #
5097: # Sub to do replies to client.. this gives a hook for some
5098: # debug tracing too:
5099: # Parameters:
5100: # fd - File open on client.
5101: # reply - Text to send to client.
5102: # request - Original request from client.
5103: #
5104: sub Reply {
5105: my ($fd, $reply, $request) = @_;
5106: print $fd $reply;
5107: Debug("Request was $request Reply was $reply");
5108:
5109: $Transactions++;
5110: }
5111:
5112:
5113: #
5114: # Sub to report a failure.
5115: # This function:
5116: # - Increments the failure statistic counters.
5117: # - Invokes Reply to send the error message to the client.
5118: # Parameters:
5119: # fd - File descriptor open on the client
5120: # reply - Reply text to emit.
5121: # request - The original request message (used by Reply
5122: # to debug if that's enabled.
5123: # Implicit outputs:
5124: # $Failures- The number of failures is incremented.
5125: # Reply (invoked here) sends a message to the
5126: # client:
5127: #
5128: sub Failure {
5129: my $fd = shift;
5130: my $reply = shift;
5131: my $request = shift;
5132:
5133: $Failures++;
5134: Reply($fd, $reply, $request); # That's simple eh?
5135: }
5136: # ------------------------------------------------------------------ Log status
5137:
5138: sub logstatus {
5139: &status("Doing logging");
5140: my $docdir=$perlvar{'lonDocRoot'};
5141: {
5142: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
5143: print $fh $status."\n".$lastlog."\n".time."\n$keymode";
5144: $fh->close();
5145: }
5146: &status("Finished $$.txt");
5147: {
5148: open(LOG,">>$docdir/lon-status/londstatus.txt");
5149: flock(LOG,LOCK_EX);
5150: print LOG $$."\t".$clientname."\t".$currenthostid."\t"
5151: .$status."\t".$lastlog."\t $keymode\n";
5152: flock(LOG,LOCK_UN);
5153: close(LOG);
5154: }
5155: &status("Finished logging");
5156: }
5157:
5158: sub initnewstatus {
5159: my $docdir=$perlvar{'lonDocRoot'};
5160: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
5161: my $now=time;
5162: my $local=localtime($now);
5163: print $fh "LOND status $local - parent $$\n\n";
5164: opendir(DIR,"$docdir/lon-status/londchld");
5165: while (my $filename=readdir(DIR)) {
5166: unlink("$docdir/lon-status/londchld/$filename");
5167: }
5168: closedir(DIR);
5169: }
5170:
5171: # -------------------------------------------------------------- Status setting
5172:
5173: sub status {
5174: my $what=shift;
5175: my $now=time;
5176: my $local=localtime($now);
5177: $status=$local.': '.$what;
5178: $0='lond: '.$what.' '.$local;
5179: }
5180:
5181: # ----------------------------------------------------------- Send USR1 to lonc
5182:
5183: sub reconlonc {
5184: my $peerfile=shift;
5185: &logthis("Trying to reconnect for $peerfile");
5186: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
5187: if (my $fh=IO::File->new("$loncfile")) {
5188: my $loncpid=<$fh>;
5189: chomp($loncpid);
5190: if (kill 0 => $loncpid) {
5191: &logthis("lonc at pid $loncpid responding, sending USR1");
5192: kill USR1 => $loncpid;
5193: } else {
5194: &logthis(
5195: "<font color='red'>CRITICAL: "
5196: ."lonc at pid $loncpid not responding, giving up</font>");
5197: }
5198: } else {
5199: &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
5200: }
5201: }
5202:
5203: # -------------------------------------------------- Non-critical communication
5204:
5205: sub subreply {
5206: my ($cmd,$server)=@_;
5207: my $peerfile="$perlvar{'lonSockDir'}/".$hostname{$server};
5208: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
5209: Type => SOCK_STREAM,
5210: Timeout => 10)
5211: or return "con_lost";
5212: print $sclient "sethost:$server:$cmd\n";
5213: my $answer=<$sclient>;
5214: chomp($answer);
5215: if (!$answer) { $answer="con_lost"; }
5216: return $answer;
5217: }
5218:
5219: sub reply {
5220: my ($cmd,$server)=@_;
5221: my $answer;
5222: if ($server ne $currenthostid) {
5223: $answer=subreply($cmd,$server);
5224: if ($answer eq 'con_lost') {
5225: $answer=subreply("ping",$server);
5226: if ($answer ne $server) {
5227: &logthis("sub reply: answer != server answer is $answer, server is $server");
5228: &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$server});
5229: }
5230: $answer=subreply($cmd,$server);
5231: }
5232: } else {
5233: $answer='self_reply';
5234: }
5235: return $answer;
5236: }
5237:
5238: # -------------------------------------------------------------- Talk to lonsql
5239:
5240: sub sql_reply {
5241: my ($cmd)=@_;
5242: my $answer=&sub_sql_reply($cmd);
5243: if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
5244: return $answer;
5245: }
5246:
5247: sub sub_sql_reply {
5248: my ($cmd)=@_;
5249: my $unixsock="mysqlsock";
5250: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
5251: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
5252: Type => SOCK_STREAM,
5253: Timeout => 10)
5254: or return "con_lost";
5255: print $sclient "$cmd:$currentdomainid\n";
5256: my $answer=<$sclient>;
5257: chomp($answer);
5258: if (!$answer) { $answer="con_lost"; }
5259: return $answer;
5260: }
5261:
5262: # -------------------------------------------- Return path to profile directory
5263:
5264: sub propath {
5265: my ($udom,$uname)=@_;
5266: $udom=~s/\W//g;
5267: $uname=~s/\W//g;
5268: my $subdir=$uname.'__';
5269: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
5270: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
5271: return $proname;
5272: }
5273:
5274: # --------------------------------------- Is this the home server of an author?
5275:
5276: sub ishome {
5277: my $author=shift;
5278: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
5279: my ($udom,$uname)=split(/\//,$author);
5280: my $proname=propath($udom,$uname);
5281: if (-e $proname) {
5282: return 'owner';
5283: } else {
5284: return 'not_owner';
5285: }
5286: }
5287:
5288: # ======================================================= Continue main program
5289: # ---------------------------------------------------- Fork once and dissociate
5290:
5291: my $fpid=fork;
5292: exit if $fpid;
5293: die "Couldn't fork: $!" unless defined ($fpid);
5294:
5295: POSIX::setsid() or die "Can't start new session: $!";
5296:
5297: # ------------------------------------------------------- Write our PID on disk
5298:
5299: my $execdir=$perlvar{'lonDaemons'};
5300: open (PIDSAVE,">$execdir/logs/lond.pid");
5301: print PIDSAVE "$$\n";
5302: close(PIDSAVE);
5303: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
5304: &status('Starting');
5305:
5306:
5307:
5308: # ----------------------------------------------------- Install signal handlers
5309:
5310:
5311: $SIG{CHLD} = \&REAPER;
5312: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
5313: $SIG{HUP} = \&HUPSMAN;
5314: $SIG{USR1} = \&checkchildren;
5315: $SIG{USR2} = \&UpdateHosts;
5316:
5317: # Read the host hashes:
5318:
5319: ReadHostTable;
5320:
5321: my $dist=`$perlvar{'lonDaemons'}/distprobe`;
5322:
5323: # --------------------------------------------------------------
5324: # Accept connections. When a connection comes in, it is validated
5325: # and if good, a child process is created to process transactions
5326: # along the connection.
5327:
5328: while (1) {
5329: &status('Starting accept');
5330: $client = $server->accept() or next;
5331: &status('Accepted '.$client.' off to spawn');
5332: make_new_child($client);
5333: &status('Finished spawning');
5334: }
5335:
5336: sub make_new_child {
5337: my $pid;
5338: # my $cipher; # Now global
5339: my $sigset;
5340:
5341: $client = shift;
5342: &status('Starting new child '.$client);
5343: &logthis('<font color="green"> Attempting to start child ('.$client.
5344: ")</font>");
5345: # block signal for fork
5346: $sigset = POSIX::SigSet->new(SIGINT);
5347: sigprocmask(SIG_BLOCK, $sigset)
5348: or die "Can't block SIGINT for fork: $!\n";
5349:
5350: die "fork: $!" unless defined ($pid = fork);
5351:
5352: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
5353: # connection liveness.
5354:
5355: #
5356: # Figure out who we're talking to so we can record the peer in
5357: # the pid hash.
5358: #
5359: my $caller = getpeername($client);
5360: my ($port,$iaddr);
5361: if (defined($caller) && length($caller) > 0) {
5362: ($port,$iaddr)=unpack_sockaddr_in($caller);
5363: } else {
5364: &logthis("Unable to determine who caller was, getpeername returned nothing");
5365: }
5366: if (defined($iaddr)) {
5367: $clientip = inet_ntoa($iaddr);
5368: Debug("Connected with $clientip");
5369: } else {
5370: &logthis("Unable to determine clientip");
5371: $clientip='Unavailable';
5372: }
5373:
5374: if ($pid) {
5375: # Parent records the child's birth and returns.
5376: sigprocmask(SIG_UNBLOCK, $sigset)
5377: or die "Can't unblock SIGINT for fork: $!\n";
5378: $children{$pid} = $clientip;
5379: &status('Started child '.$pid);
5380: return;
5381: } else {
5382: # Child can *not* return from this subroutine.
5383: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
5384: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
5385: #don't get intercepted
5386: $SIG{USR1}= \&logstatus;
5387: $SIG{ALRM}= \&timeout;
5388: $lastlog='Forked ';
5389: $status='Forked';
5390:
5391: # unblock signals
5392: sigprocmask(SIG_UNBLOCK, $sigset)
5393: or die "Can't unblock SIGINT for fork: $!\n";
5394:
5395: # my $tmpsnum=0; # Now global
5396: #---------------------------------------------------- kerberos 5 initialization
5397: &Authen::Krb5::init_context();
5398: unless (($dist eq 'fedora4') || ($dist eq 'suse9.3')) {
5399: &Authen::Krb5::init_ets();
5400: }
5401:
5402: &status('Accepted connection');
5403: # =============================================================================
5404: # do something with the connection
5405: # -----------------------------------------------------------------------------
5406: # see if we know client and 'check' for spoof IP by ineffective challenge
5407:
5408: ReadManagerTable; # May also be a manager!!
5409:
5410: my $outsideip=$clientip;
5411: if ($clientip eq '127.0.0.1') {
5412: $outsideip=$hostip{$perlvar{'lonHostID'}};
5413: }
5414:
5415: my $clientrec=($hostid{$outsideip} ne undef);
5416: my $ismanager=($managers{$outsideip} ne undef);
5417: $clientname = "[unknonwn]";
5418: if($clientrec) { # Establish client type.
5419: $ConnectionType = "client";
5420: $clientname = $hostid{$outsideip};
5421: if($ismanager) {
5422: $ConnectionType = "both";
5423: }
5424: } else {
5425: $ConnectionType = "manager";
5426: $clientname = $managers{$outsideip};
5427: }
5428: my $clientok;
5429:
5430: if ($clientrec || $ismanager) {
5431: &status("Waiting for init from $clientip $clientname");
5432: &logthis('<font color="yellow">INFO: Connection, '.
5433: $clientip.
5434: " ($clientname) connection type = $ConnectionType </font>" );
5435: &status("Connecting $clientip ($clientname))");
5436: my $remotereq=<$client>;
5437: chomp($remotereq);
5438: Debug("Got init: $remotereq");
5439: my $inikeyword = split(/:/, $remotereq);
5440: if ($remotereq =~ /^init/) {
5441: &sethost("sethost:$perlvar{'lonHostID'}");
5442: #
5443: # If the remote is attempting a local init... give that a try:
5444: #
5445: my ($i, $inittype) = split(/:/, $remotereq);
5446:
5447: # If the connection type is ssl, but I didn't get my
5448: # certificate files yet, then I'll drop back to
5449: # insecure (if allowed).
5450:
5451: if($inittype eq "ssl") {
5452: my ($ca, $cert) = lonssl::CertificateFile;
5453: my $kfile = lonssl::KeyFile;
5454: if((!$ca) ||
5455: (!$cert) ||
5456: (!$kfile)) {
5457: $inittype = ""; # This forces insecure attempt.
5458: &logthis("<font color=\"blue\"> Certificates not "
5459: ."installed -- trying insecure auth</font>");
5460: } else { # SSL certificates are in place so
5461: } # Leave the inittype alone.
5462: }
5463:
5464: if($inittype eq "local") {
5465: my $key = LocalConnection($client, $remotereq);
5466: if($key) {
5467: Debug("Got local key $key");
5468: $clientok = 1;
5469: my $cipherkey = pack("H32", $key);
5470: $cipher = new IDEA($cipherkey);
5471: print $client "ok:local\n";
5472: &logthis('<font color="green"'
5473: . "Successful local authentication </font>");
5474: $keymode = "local"
5475: } else {
5476: Debug("Failed to get local key");
5477: $clientok = 0;
5478: shutdown($client, 3);
5479: close $client;
5480: }
5481: } elsif ($inittype eq "ssl") {
5482: my $key = SSLConnection($client);
5483: if ($key) {
5484: $clientok = 1;
5485: my $cipherkey = pack("H32", $key);
5486: $cipher = new IDEA($cipherkey);
5487: &logthis('<font color="green">'
5488: ."Successfull ssl authentication with $clientname </font>");
5489: $keymode = "ssl";
5490:
5491: } else {
5492: $clientok = 0;
5493: close $client;
5494: }
5495:
5496: } else {
5497: my $ok = InsecureConnection($client);
5498: if($ok) {
5499: $clientok = 1;
5500: &logthis('<font color="green">'
5501: ."Successful insecure authentication with $clientname </font>");
5502: print $client "ok\n";
5503: $keymode = "insecure";
5504: } else {
5505: &logthis('<font color="yellow">'
5506: ."Attempted insecure connection disallowed </font>");
5507: close $client;
5508: $clientok = 0;
5509:
5510: }
5511: }
5512: } else {
5513: &logthis(
5514: "<font color='blue'>WARNING: "
5515: ."$clientip failed to initialize: >$remotereq< </font>");
5516: &status('No init '.$clientip);
5517: }
5518:
5519: } else {
5520: &logthis(
5521: "<font color='blue'>WARNING: Unknown client $clientip</font>");
5522: &status('Hung up on '.$clientip);
5523: }
5524:
5525: if ($clientok) {
5526: # ---------------- New known client connecting, could mean machine online again
5527:
5528: foreach my $id (keys(%hostip)) {
5529: if ($hostip{$id} ne $clientip ||
5530: $hostip{$currenthostid} eq $clientip) {
5531: # no need to try to do recon's to myself
5532: next;
5533: }
5534: &reconlonc("$perlvar{'lonSockDir'}/".$hostname{$id});
5535: }
5536: &logthis("<font color='green'>Established connection: $clientname</font>");
5537: &status('Will listen to '.$clientname);
5538: # ------------------------------------------------------------ Process requests
5539: my $keep_going = 1;
5540: my $user_input;
5541: while(($user_input = get_request) && $keep_going) {
5542: alarm(120);
5543: Debug("Main: Got $user_input\n");
5544: $keep_going = &process_request($user_input);
5545: alarm(0);
5546: &status('Listening to '.$clientname." ($keymode)");
5547: }
5548:
5549: # --------------------------------------------- client unknown or fishy, refuse
5550: } else {
5551: print $client "refused\n";
5552: $client->close();
5553: &logthis("<font color='blue'>WARNING: "
5554: ."Rejected client $clientip, closing connection</font>");
5555: }
5556: }
5557:
5558: # =============================================================================
5559:
5560: &logthis("<font color='red'>CRITICAL: "
5561: ."Disconnect from $clientip ($clientname)</font>");
5562:
5563:
5564: # this exit is VERY important, otherwise the child will become
5565: # a producer of more and more children, forking yourself into
5566: # process death.
5567: exit;
5568:
5569: }
5570: #
5571: # Determine if a user is an author for the indicated domain.
5572: #
5573: # Parameters:
5574: # domain - domain to check in .
5575: # user - Name of user to check.
5576: #
5577: # Return:
5578: # 1 - User is an author for domain.
5579: # 0 - User is not an author for domain.
5580: sub is_author {
5581: my ($domain, $user) = @_;
5582:
5583: &Debug("is_author: $user @ $domain");
5584:
5585: my $hashref = &tie_user_hash($domain, $user, "roles",
5586: &GDBM_READER());
5587:
5588: # Author role should show up as a key /domain/_au
5589:
5590: my $key = "/$domain/_au";
5591: my $value;
5592: if (defined($hashref)) {
5593: $value = $hashref->{$key};
5594: }
5595:
5596: if(defined($value)) {
5597: &Debug("$user @ $domain is an author");
5598: }
5599:
5600: return defined($value);
5601: }
5602: #
5603: # Checks to see if the input roleput request was to set
5604: # an author role. If so, invokes the lchtmldir script to set
5605: # up a correct public_html
5606: # Parameters:
5607: # request - The request sent to the rolesput subchunk.
5608: # We're looking for /domain/_au
5609: # domain - The domain in which the user is having roles doctored.
5610: # user - Name of the user for which the role is being put.
5611: # authtype - The authentication type associated with the user.
5612: #
5613: sub manage_permissions {
5614: my ($request, $domain, $user, $authtype) = @_;
5615:
5616: &Debug("manage_permissions: $request $domain $user $authtype");
5617:
5618: # See if the request is of the form /$domain/_au
5619: if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
5620: my $execdir = $perlvar{'lonDaemons'};
5621: my $userhome= "/home/$user" ;
5622: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
5623: &Debug("Setting homedir permissions for $userhome");
5624: system("$execdir/lchtmldir $userhome $user $authtype");
5625: }
5626: }
5627:
5628:
5629: #
5630: # Return the full path of a user password file, whether it exists or not.
5631: # Parameters:
5632: # domain - Domain in which the password file lives.
5633: # user - name of the user.
5634: # Returns:
5635: # Full passwd path:
5636: #
5637: sub password_path {
5638: my ($domain, $user) = @_;
5639: return &propath($domain, $user).'/passwd';
5640: }
5641:
5642: # Password Filename
5643: # Returns the path to a passwd file given domain and user... only if
5644: # it exists.
5645: # Parameters:
5646: # domain - Domain in which to search.
5647: # user - username.
5648: # Returns:
5649: # - If the password file exists returns its path.
5650: # - If the password file does not exist, returns undefined.
5651: #
5652: sub password_filename {
5653: my ($domain, $user) = @_;
5654:
5655: Debug ("PasswordFilename called: dom = $domain user = $user");
5656:
5657: my $path = &password_path($domain, $user);
5658: Debug("PasswordFilename got path: $path");
5659: if(-e $path) {
5660: return $path;
5661: } else {
5662: return undef;
5663: }
5664: }
5665:
5666: #
5667: # Rewrite the contents of the user's passwd file.
5668: # Parameters:
5669: # domain - domain of the user.
5670: # name - User's name.
5671: # contents - New contents of the file.
5672: # Returns:
5673: # 0 - Failed.
5674: # 1 - Success.
5675: #
5676: sub rewrite_password_file {
5677: my ($domain, $user, $contents) = @_;
5678:
5679: my $file = &password_filename($domain, $user);
5680: if (defined $file) {
5681: my $pf = IO::File->new(">$file");
5682: if($pf) {
5683: print $pf "$contents\n";
5684: return 1;
5685: } else {
5686: return 0;
5687: }
5688: } else {
5689: return 0;
5690: }
5691:
5692: }
5693:
5694: #
5695: # get_auth_type - Determines the authorization type of a user in a domain.
5696:
5697: # Returns the authorization type or nouser if there is no such user.
5698: #
5699: sub get_auth_type
5700: {
5701:
5702: my ($domain, $user) = @_;
5703:
5704: Debug("get_auth_type( $domain, $user ) \n");
5705: my $proname = &propath($domain, $user);
5706: my $passwdfile = "$proname/passwd";
5707: if( -e $passwdfile ) {
5708: my $pf = IO::File->new($passwdfile);
5709: my $realpassword = <$pf>;
5710: chomp($realpassword);
5711: Debug("Password info = $realpassword\n");
5712: my ($authtype, $contentpwd) = split(/:/, $realpassword);
5713: Debug("Authtype = $authtype, content = $contentpwd\n");
5714: return "$authtype:$contentpwd";
5715: } else {
5716: Debug("Returning nouser");
5717: return "nouser";
5718: }
5719: }
5720:
5721: #
5722: # Validate a user given their domain, name and password. This utility
5723: # function is used by both AuthenticateHandler and ChangePasswordHandler
5724: # to validate the login credentials of a user.
5725: # Parameters:
5726: # $domain - The domain being logged into (this is required due to
5727: # the capability for multihomed systems.
5728: # $user - The name of the user being validated.
5729: # $password - The user's propoposed password.
5730: #
5731: # Returns:
5732: # 1 - The domain,user,pasword triplet corresponds to a valid
5733: # user.
5734: # 0 - The domain,user,password triplet is not a valid user.
5735: #
5736: sub validate_user {
5737: my ($domain, $user, $password) = @_;
5738:
5739:
5740: # Why negative ~pi you may well ask? Well this function is about
5741: # authentication, and therefore very important to get right.
5742: # I've initialized the flag that determines whether or not I've
5743: # validated correctly to a value it's not supposed to get.
5744: # At the end of this function. I'll ensure that it's not still that
5745: # value so we don't just wind up returning some accidental value
5746: # as a result of executing an unforseen code path that
5747: # did not set $validated. At the end of valid execution paths,
5748: # validated shoule be 1 for success or 0 for failuer.
5749:
5750: my $validated = -3.14159;
5751:
5752: # How we authenticate is determined by the type of authentication
5753: # the user has been assigned. If the authentication type is
5754: # "nouser", the user does not exist so we will return 0.
5755:
5756: my $contents = &get_auth_type($domain, $user);
5757: my ($howpwd, $contentpwd) = split(/:/, $contents);
5758:
5759: my $null = pack("C",0); # Used by kerberos auth types.
5760:
5761: if ($howpwd ne 'nouser') {
5762:
5763: if($howpwd eq "internal") { # Encrypted is in local password file.
5764: $validated = (crypt($password, $contentpwd) eq $contentpwd);
5765: }
5766: elsif ($howpwd eq "unix") { # User is a normal unix user.
5767: $contentpwd = (getpwnam($user))[1];
5768: if($contentpwd) {
5769: if($contentpwd eq 'x') { # Shadow password file...
5770: my $pwauth_path = "/usr/local/sbin/pwauth";
5771: open PWAUTH, "|$pwauth_path" or
5772: die "Cannot invoke authentication";
5773: print PWAUTH "$user\n$password\n";
5774: close PWAUTH;
5775: $validated = ! $?;
5776:
5777: } else { # Passwords in /etc/passwd.
5778: $validated = (crypt($password,
5779: $contentpwd) eq $contentpwd);
5780: }
5781: } else {
5782: $validated = 0;
5783: }
5784: }
5785: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
5786: if(! ($password =~ /$null/) ) {
5787: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
5788: "",
5789: $contentpwd,,
5790: 'krbtgt',
5791: $contentpwd,
5792: 1,
5793: $password);
5794: if(!$k4error) {
5795: $validated = 1;
5796: } else {
5797: $validated = 0;
5798: &logthis('krb4: '.$user.', '.$contentpwd.', '.
5799: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
5800: }
5801: } else {
5802: $validated = 0; # Password has a match with null.
5803: }
5804: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
5805: if(!($password =~ /$null/)) { # Null password not allowed.
5806: my $krbclient = &Authen::Krb5::parse_name($user.'@'
5807: .$contentpwd);
5808: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
5809: my $krbserver = &Authen::Krb5::parse_name($krbservice);
5810: my $credentials= &Authen::Krb5::cc_default();
5811: $credentials->initialize($krbclient);
5812: my $krbreturn = &Authen::Krb5::get_in_tkt_with_password($krbclient,
5813: $krbserver,
5814: $password,
5815: $credentials);
5816: $validated = ($krbreturn == 1);
5817: } else {
5818: $validated = 0;
5819: }
5820: } elsif ($howpwd eq "localauth") {
5821: # Authenticate via installation specific authentcation method:
5822: $validated = &localauth::localauth($user,
5823: $password,
5824: $contentpwd);
5825: } else { # Unrecognized auth is also bad.
5826: $validated = 0;
5827: }
5828: } else {
5829: $validated = 0;
5830: }
5831: #
5832: # $validated has the correct stat of the authentication:
5833: #
5834:
5835: unless ($validated != -3.14159) {
5836: # I >really really< want to know if this happens.
5837: # since it indicates that user authentication is badly
5838: # broken in some code path.
5839: #
5840: die "ValidateUser - failed to set the value of validated $domain, $user $password";
5841: }
5842: return $validated;
5843: }
5844:
5845:
5846: sub addline {
5847: my ($fname,$hostid,$ip,$newline)=@_;
5848: my $contents;
5849: my $found=0;
5850: my $expr='^'.$hostid.':'.$ip.':';
5851: $expr =~ s/\./\\\./g;
5852: my $sh;
5853: if ($sh=IO::File->new("$fname.subscription")) {
5854: while (my $subline=<$sh>) {
5855: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
5856: }
5857: $sh->close();
5858: }
5859: $sh=IO::File->new(">$fname.subscription");
5860: if ($contents) { print $sh $contents; }
5861: if ($newline) { print $sh $newline; }
5862: $sh->close();
5863: return $found;
5864: }
5865:
5866: sub get_chat {
5867: my ($cdom,$cname,$udom,$uname,$group)=@_;
5868:
5869: my @entries=();
5870: my $namespace = 'nohist_chatroom';
5871: my $namespace_inroom = 'nohist_inchatroom';
5872: if (defined($group)) {
5873: $namespace .= '_'.$group;
5874: $namespace_inroom .= '_'.$group;
5875: }
5876: my $hashref = &tie_user_hash($cdom, $cname, $namespace,
5877: &GDBM_READER());
5878: if ($hashref) {
5879: @entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
5880: &untie_user_hash($hashref);
5881: }
5882: my @participants=();
5883: my $cutoff=time-60;
5884: $hashref = &tie_user_hash($cdom, $cname, $namespace_inroom,
5885: &GDBM_WRCREAT());
5886: if ($hashref) {
5887: $hashref->{$uname.':'.$udom}=time;
5888: foreach my $user (sort(keys(%$hashref))) {
5889: if ($hashref->{$user}>$cutoff) {
5890: push(@participants, 'active_participant:'.$user);
5891: }
5892: }
5893: &untie_user_hash($hashref);
5894: }
5895: return (@participants,@entries);
5896: }
5897:
5898: sub chat_add {
5899: my ($cdom,$cname,$newchat,$group)=@_;
5900: my @entries=();
5901: my $time=time;
5902: my $namespace = 'nohist_chatroom';
5903: my $logfile = 'chatroom.log';
5904: if (defined($group)) {
5905: $namespace .= '_'.$group;
5906: $logfile = 'chatroom_'.$group.'.log';
5907: }
5908: my $hashref = &tie_user_hash($cdom, $cname, $namespace,
5909: &GDBM_WRCREAT());
5910: if ($hashref) {
5911: @entries=map { $_.':'.$hashref->{$_} } sort(keys(%$hashref));
5912: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
5913: my ($thentime,$idnum)=split(/\_/,$lastid);
5914: my $newid=$time.'_000000';
5915: if ($thentime==$time) {
5916: $idnum=~s/^0+//;
5917: $idnum++;
5918: $idnum=substr('000000'.$idnum,-6,6);
5919: $newid=$time.'_'.$idnum;
5920: }
5921: $hashref->{$newid}=$newchat;
5922: my $expired=$time-3600;
5923: foreach my $comment (keys(%$hashref)) {
5924: my ($thistime) = ($comment=~/(\d+)\_/);
5925: if ($thistime<$expired) {
5926: delete $hashref->{$comment};
5927: }
5928: }
5929: {
5930: my $proname=&propath($cdom,$cname);
5931: if (open(CHATLOG,">>$proname/$logfile")) {
5932: print CHATLOG ("$time:".&unescape($newchat)."\n");
5933: }
5934: close(CHATLOG);
5935: }
5936: &untie_user_hash($hashref);
5937: }
5938: }
5939:
5940: sub unsub {
5941: my ($fname,$clientip)=@_;
5942: my $result;
5943: my $unsubs = 0; # Number of successful unsubscribes:
5944:
5945:
5946: # An old way subscriptions were handled was to have a
5947: # subscription marker file:
5948:
5949: Debug("Attempting unlink of $fname.$clientname");
5950: if (unlink("$fname.$clientname")) {
5951: $unsubs++; # Successful unsub via marker file.
5952: }
5953:
5954: # The more modern way to do it is to have a subscription list
5955: # file:
5956:
5957: if (-e "$fname.subscription") {
5958: my $found=&addline($fname,$clientname,$clientip,'');
5959: if ($found) {
5960: $unsubs++;
5961: }
5962: }
5963:
5964: # If either or both of these mechanisms succeeded in unsubscribing a
5965: # resource we can return ok:
5966:
5967: if($unsubs) {
5968: $result = "ok\n";
5969: } else {
5970: $result = "not_subscribed\n";
5971: }
5972:
5973: return $result;
5974: }
5975:
5976: sub currentversion {
5977: my $fname=shift;
5978: my $version=-1;
5979: my $ulsdir='';
5980: if ($fname=~/^(.+)\/[^\/]+$/) {
5981: $ulsdir=$1;
5982: }
5983: my ($fnamere1,$fnamere2);
5984: # remove version if already specified
5985: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
5986: # get the bits that go before and after the version number
5987: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
5988: $fnamere1=$1;
5989: $fnamere2='.'.$2;
5990: }
5991: if (-e $fname) { $version=1; }
5992: if (-e $ulsdir) {
5993: if(-d $ulsdir) {
5994: if (opendir(LSDIR,$ulsdir)) {
5995: my $ulsfn;
5996: while ($ulsfn=readdir(LSDIR)) {
5997: # see if this is a regular file (ignore links produced earlier)
5998: my $thisfile=$ulsdir.'/'.$ulsfn;
5999: unless (-l $thisfile) {
6000: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
6001: if ($1>$version) { $version=$1; }
6002: }
6003: }
6004: }
6005: closedir(LSDIR);
6006: $version++;
6007: }
6008: }
6009: }
6010: return $version;
6011: }
6012:
6013: sub thisversion {
6014: my $fname=shift;
6015: my $version=-1;
6016: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
6017: $version=$1;
6018: }
6019: return $version;
6020: }
6021:
6022: sub subscribe {
6023: my ($userinput,$clientip)=@_;
6024: my $result;
6025: my ($cmd,$fname)=split(/:/,$userinput,2);
6026: my $ownership=&ishome($fname);
6027: if ($ownership eq 'owner') {
6028: # explitly asking for the current version?
6029: unless (-e $fname) {
6030: my $currentversion=¤tversion($fname);
6031: if (&thisversion($fname)==$currentversion) {
6032: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
6033: my $root=$1;
6034: my $extension=$2;
6035: symlink($root.'.'.$extension,
6036: $root.'.'.$currentversion.'.'.$extension);
6037: unless ($extension=~/\.meta$/) {
6038: symlink($root.'.'.$extension.'.meta',
6039: $root.'.'.$currentversion.'.'.$extension.'.meta');
6040: }
6041: }
6042: }
6043: }
6044: if (-e $fname) {
6045: if (-d $fname) {
6046: $result="directory\n";
6047: } else {
6048: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
6049: my $now=time;
6050: my $found=&addline($fname,$clientname,$clientip,
6051: "$clientname:$clientip:$now\n");
6052: if ($found) { $result="$fname\n"; }
6053: # if they were subscribed to only meta data, delete that
6054: # subscription, when you subscribe to a file you also get
6055: # the metadata
6056: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
6057: $fname=~s/\/home\/httpd\/html\/res/raw/;
6058: $fname="http://$thisserver/".$fname;
6059: $result="$fname\n";
6060: }
6061: } else {
6062: $result="not_found\n";
6063: }
6064: } else {
6065: $result="rejected\n";
6066: }
6067: return $result;
6068: }
6069: # Change the passwd of a unix user. The caller must have
6070: # first verified that the user is a loncapa user.
6071: #
6072: # Parameters:
6073: # user - Unix user name to change.
6074: # pass - New password for the user.
6075: # Returns:
6076: # ok - if success
6077: # other - Some meaningfule error message string.
6078: # NOTE:
6079: # invokes a setuid script to change the passwd.
6080: sub change_unix_password {
6081: my ($user, $pass) = @_;
6082:
6083: &Debug("change_unix_password");
6084: my $execdir=$perlvar{'lonDaemons'};
6085: &Debug("Opening lcpasswd pipeline");
6086: my $pf = IO::File->new("|$execdir/lcpasswd > "
6087: ."$perlvar{'lonDaemons'}"
6088: ."/logs/lcpasswd.log");
6089: print $pf "$user\n$pass\n$pass\n";
6090: close $pf;
6091: my $err = $?;
6092: return ($err < @passwderrors) ? $passwderrors[$err] :
6093: "pwchange_falure - unknown error";
6094:
6095:
6096: }
6097:
6098:
6099: sub make_passwd_file {
6100: my ($uname, $umode,$npass,$passfilename)=@_;
6101: my $result="ok\n";
6102: if ($umode eq 'krb4' or $umode eq 'krb5') {
6103: {
6104: my $pf = IO::File->new(">$passfilename");
6105: if ($pf) {
6106: print $pf "$umode:$npass\n";
6107: } else {
6108: $result = "pass_file_failed_error";
6109: }
6110: }
6111: } elsif ($umode eq 'internal') {
6112: my $salt=time;
6113: $salt=substr($salt,6,2);
6114: my $ncpass=crypt($npass,$salt);
6115: {
6116: &Debug("Creating internal auth");
6117: my $pf = IO::File->new(">$passfilename");
6118: if($pf) {
6119: print $pf "internal:$ncpass\n";
6120: } else {
6121: $result = "pass_file_failed_error";
6122: }
6123: }
6124: } elsif ($umode eq 'localauth') {
6125: {
6126: my $pf = IO::File->new(">$passfilename");
6127: if($pf) {
6128: print $pf "localauth:$npass\n";
6129: } else {
6130: $result = "pass_file_failed_error";
6131: }
6132: }
6133: } elsif ($umode eq 'unix') {
6134: {
6135: #
6136: # Don't allow the creation of privileged accounts!!! that would
6137: # be real bad!!!
6138: #
6139: my $uid = getpwnam($uname);
6140: if((defined $uid) && ($uid == 0)) {
6141: &logthis(">>>Attempted to create privilged account blocked");
6142: return "no_priv_account_error\n";
6143: }
6144:
6145: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
6146:
6147: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
6148: {
6149: &Debug("Executing external: ".$execpath);
6150: &Debug("user = ".$uname.", Password =". $npass);
6151: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
6152: print $se "$uname\n";
6153: print $se "$npass\n";
6154: print $se "$npass\n";
6155: print $se "$lc_error_file\n"; # Status -> unique file.
6156: }
6157: if (-r $lc_error_file) {
6158: &Debug("Opening error file: $lc_error_file");
6159: my $error = IO::File->new("< $lc_error_file");
6160: my $useraddok = <$error>;
6161: $error->close;
6162: unlink($lc_error_file);
6163:
6164: chomp $useraddok;
6165:
6166: if($useraddok > 0) {
6167: my $error_text = &lcuseraddstrerror($useraddok);
6168: &logthis("Failed lcuseradd: $error_text");
6169: $result = "lcuseradd_failed:$error_text\n";
6170: } else {
6171: my $pf = IO::File->new(">$passfilename");
6172: if($pf) {
6173: print $pf "unix:\n";
6174: } else {
6175: $result = "pass_file_failed_error";
6176: }
6177: }
6178: } else {
6179: &Debug("Could not locate lcuseradd error: $lc_error_file");
6180: $result="bug_lcuseradd_no_output_file";
6181: }
6182: }
6183: } elsif ($umode eq 'none') {
6184: {
6185: my $pf = IO::File->new("> $passfilename");
6186: if($pf) {
6187: print $pf "none:\n";
6188: } else {
6189: $result = "pass_file_failed_error";
6190: }
6191: }
6192: } else {
6193: $result="auth_mode_error\n";
6194: }
6195: return $result;
6196: }
6197:
6198: sub convert_photo {
6199: my ($start,$dest)=@_;
6200: system("convert $start $dest");
6201: }
6202:
6203: sub sethost {
6204: my ($remotereq) = @_;
6205: my (undef,$hostid)=split(/:/,$remotereq);
6206: # ignore sethost if we are already correct
6207: if ($hostid eq $currenthostid) {
6208: return 'ok';
6209: }
6210:
6211: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
6212: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
6213: $currenthostid =$hostid;
6214: $currentdomainid=$hostdom{$hostid};
6215: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
6216: } else {
6217: &logthis("Requested host id $hostid not an alias of ".
6218: $perlvar{'lonHostID'}." refusing connection");
6219: return 'unable_to_set';
6220: }
6221: return 'ok';
6222: }
6223:
6224: sub version {
6225: my ($userinput)=@_;
6226: $remoteVERSION=(split(/:/,$userinput))[1];
6227: return "version:$VERSION";
6228: }
6229:
6230: #There is a copy of this in lonnet.pm
6231: sub userload {
6232: my $numusers=0;
6233: {
6234: opendir(LONIDS,$perlvar{'lonIDsDir'});
6235: my $filename;
6236: my $curtime=time;
6237: while ($filename=readdir(LONIDS)) {
6238: if ($filename eq '.' || $filename eq '..') {next;}
6239: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
6240: if ($curtime-$mtime < 1800) { $numusers++; }
6241: }
6242: closedir(LONIDS);
6243: }
6244: my $userloadpercent=0;
6245: my $maxuserload=$perlvar{'lonUserLoadLim'};
6246: if ($maxuserload) {
6247: $userloadpercent=100*$numusers/$maxuserload;
6248: }
6249: $userloadpercent=sprintf("%.2f",$userloadpercent);
6250: return $userloadpercent;
6251: }
6252:
6253: # Routines for serializing arrays and hashes (copies from lonnet)
6254:
6255: sub array2str {
6256: my (@array) = @_;
6257: my $result=&arrayref2str(\@array);
6258: $result=~s/^__ARRAY_REF__//;
6259: $result=~s/__END_ARRAY_REF__$//;
6260: return $result;
6261: }
6262:
6263: sub arrayref2str {
6264: my ($arrayref) = @_;
6265: my $result='__ARRAY_REF__';
6266: foreach my $elem (@$arrayref) {
6267: if(ref($elem) eq 'ARRAY') {
6268: $result.=&arrayref2str($elem).'&';
6269: } elsif(ref($elem) eq 'HASH') {
6270: $result.=&hashref2str($elem).'&';
6271: } elsif(ref($elem)) {
6272: #print("Got a ref of ".(ref($elem))." skipping.");
6273: } else {
6274: $result.=&escape($elem).'&';
6275: }
6276: }
6277: $result=~s/\&$//;
6278: $result .= '__END_ARRAY_REF__';
6279: return $result;
6280: }
6281:
6282: sub hash2str {
6283: my (%hash) = @_;
6284: my $result=&hashref2str(\%hash);
6285: $result=~s/^__HASH_REF__//;
6286: $result=~s/__END_HASH_REF__$//;
6287: return $result;
6288: }
6289:
6290: sub hashref2str {
6291: my ($hashref)=@_;
6292: my $result='__HASH_REF__';
6293: foreach (sort(keys(%$hashref))) {
6294: if (ref($_) eq 'ARRAY') {
6295: $result.=&arrayref2str($_).'=';
6296: } elsif (ref($_) eq 'HASH') {
6297: $result.=&hashref2str($_).'=';
6298: } elsif (ref($_)) {
6299: $result.='=';
6300: #print("Got a ref of ".(ref($_))." skipping.");
6301: } else {
6302: if ($_) {$result.=&escape($_).'=';} else { last; }
6303: }
6304:
6305: if(ref($hashref->{$_}) eq 'ARRAY') {
6306: $result.=&arrayref2str($hashref->{$_}).'&';
6307: } elsif(ref($hashref->{$_}) eq 'HASH') {
6308: $result.=&hashref2str($hashref->{$_}).'&';
6309: } elsif(ref($hashref->{$_})) {
6310: $result.='&';
6311: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
6312: } else {
6313: $result.=&escape($hashref->{$_}).'&';
6314: }
6315: }
6316: $result=~s/\&$//;
6317: $result .= '__END_HASH_REF__';
6318: return $result;
6319: }
6320:
6321: # ----------------------------------- POD (plain old documentation, CPAN style)
6322:
6323: =head1 NAME
6324:
6325: lond - "LON Daemon" Server (port "LOND" 5663)
6326:
6327: =head1 SYNOPSIS
6328:
6329: Usage: B<lond>
6330:
6331: Should only be run as user=www. This is a command-line script which
6332: is invoked by B<loncron>. There is no expectation that a typical user
6333: will manually start B<lond> from the command-line. (In other words,
6334: DO NOT START B<lond> YOURSELF.)
6335:
6336: =head1 DESCRIPTION
6337:
6338: There are two characteristics associated with the running of B<lond>,
6339: PROCESS MANAGEMENT (starting, stopping, handling child processes)
6340: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
6341: subscriptions, etc). These are described in two large
6342: sections below.
6343:
6344: B<PROCESS MANAGEMENT>
6345:
6346: Preforker - server who forks first. Runs as a daemon. HUPs.
6347: Uses IDEA encryption
6348:
6349: B<lond> forks off children processes that correspond to the other servers
6350: in the network. Management of these processes can be done at the
6351: parent process level or the child process level.
6352:
6353: B<logs/lond.log> is the location of log messages.
6354:
6355: The process management is now explained in terms of linux shell commands,
6356: subroutines internal to this code, and signal assignments:
6357:
6358: =over 4
6359:
6360: =item *
6361:
6362: PID is stored in B<logs/lond.pid>
6363:
6364: This is the process id number of the parent B<lond> process.
6365:
6366: =item *
6367:
6368: SIGTERM and SIGINT
6369:
6370: Parent signal assignment:
6371: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
6372:
6373: Child signal assignment:
6374: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
6375: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
6376: to restart a new child.)
6377:
6378: Command-line invocations:
6379: B<kill> B<-s> SIGTERM I<PID>
6380: B<kill> B<-s> SIGINT I<PID>
6381:
6382: Subroutine B<HUNTSMAN>:
6383: This is only invoked for the B<lond> parent I<PID>.
6384: This kills all the children, and then the parent.
6385: The B<lonc.pid> file is cleared.
6386:
6387: =item *
6388:
6389: SIGHUP
6390:
6391: Current bug:
6392: This signal can only be processed the first time
6393: on the parent process. Subsequent SIGHUP signals
6394: have no effect.
6395:
6396: Parent signal assignment:
6397: $SIG{HUP} = \&HUPSMAN;
6398:
6399: Child signal assignment:
6400: none (nothing happens)
6401:
6402: Command-line invocations:
6403: B<kill> B<-s> SIGHUP I<PID>
6404:
6405: Subroutine B<HUPSMAN>:
6406: This is only invoked for the B<lond> parent I<PID>,
6407: This kills all the children, and then the parent.
6408: The B<lond.pid> file is cleared.
6409:
6410: =item *
6411:
6412: SIGUSR1
6413:
6414: Parent signal assignment:
6415: $SIG{USR1} = \&USRMAN;
6416:
6417: Child signal assignment:
6418: $SIG{USR1}= \&logstatus;
6419:
6420: Command-line invocations:
6421: B<kill> B<-s> SIGUSR1 I<PID>
6422:
6423: Subroutine B<USRMAN>:
6424: When invoked for the B<lond> parent I<PID>,
6425: SIGUSR1 is sent to all the children, and the status of
6426: each connection is logged.
6427:
6428: =item *
6429:
6430: SIGUSR2
6431:
6432: Parent Signal assignment:
6433: $SIG{USR2} = \&UpdateHosts
6434:
6435: Child signal assignment:
6436: NONE
6437:
6438:
6439: =item *
6440:
6441: SIGCHLD
6442:
6443: Parent signal assignment:
6444: $SIG{CHLD} = \&REAPER;
6445:
6446: Child signal assignment:
6447: none
6448:
6449: Command-line invocations:
6450: B<kill> B<-s> SIGCHLD I<PID>
6451:
6452: Subroutine B<REAPER>:
6453: This is only invoked for the B<lond> parent I<PID>.
6454: Information pertaining to the child is removed.
6455: The socket port is cleaned up.
6456:
6457: =back
6458:
6459: B<SERVER-SIDE ACTIVITIES>
6460:
6461: Server-side information can be accepted in an encrypted or non-encrypted
6462: method.
6463:
6464: =over 4
6465:
6466: =item ping
6467:
6468: Query a client in the hosts.tab table; "Are you there?"
6469:
6470: =item pong
6471:
6472: Respond to a ping query.
6473:
6474: =item ekey
6475:
6476: Read in encrypted key, make cipher. Respond with a buildkey.
6477:
6478: =item load
6479:
6480: Respond with CPU load based on a computation upon /proc/loadavg.
6481:
6482: =item currentauth
6483:
6484: Reply with current authentication information (only over an
6485: encrypted channel).
6486:
6487: =item auth
6488:
6489: Only over an encrypted channel, reply as to whether a user's
6490: authentication information can be validated.
6491:
6492: =item passwd
6493:
6494: Allow for a password to be set.
6495:
6496: =item makeuser
6497:
6498: Make a user.
6499:
6500: =item passwd
6501:
6502: Allow for authentication mechanism and password to be changed.
6503:
6504: =item home
6505:
6506: Respond to a question "are you the home for a given user?"
6507:
6508: =item update
6509:
6510: Update contents of a subscribed resource.
6511:
6512: =item unsubscribe
6513:
6514: The server is unsubscribing from a resource.
6515:
6516: =item subscribe
6517:
6518: The server is subscribing to a resource.
6519:
6520: =item log
6521:
6522: Place in B<logs/lond.log>
6523:
6524: =item put
6525:
6526: stores hash in namespace
6527:
6528: =item rolesputy
6529:
6530: put a role into a user's environment
6531:
6532: =item get
6533:
6534: returns hash with keys from array
6535: reference filled in from namespace
6536:
6537: =item eget
6538:
6539: returns hash with keys from array
6540: reference filled in from namesp (encrypts the return communication)
6541:
6542: =item rolesget
6543:
6544: get a role from a user's environment
6545:
6546: =item del
6547:
6548: deletes keys out of array from namespace
6549:
6550: =item keys
6551:
6552: returns namespace keys
6553:
6554: =item dump
6555:
6556: dumps the complete (or key matching regexp) namespace into a hash
6557:
6558: =item store
6559:
6560: stores hash permanently
6561: for this url; hashref needs to be given and should be a \%hashname; the
6562: remaining args aren't required and if they aren't passed or are '' they will
6563: be derived from the ENV
6564:
6565: =item restore
6566:
6567: returns a hash for a given url
6568:
6569: =item querysend
6570:
6571: Tells client about the lonsql process that has been launched in response
6572: to a sent query.
6573:
6574: =item queryreply
6575:
6576: Accept information from lonsql and make appropriate storage in temporary
6577: file space.
6578:
6579: =item idput
6580:
6581: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
6582: for each student, defined perhaps by the institutional Registrar.)
6583:
6584: =item idget
6585:
6586: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
6587: for each student, defined perhaps by the institutional Registrar.)
6588:
6589: =item tmpput
6590:
6591: Accept and store information in temporary space.
6592:
6593: =item tmpget
6594:
6595: Send along temporarily stored information.
6596:
6597: =item ls
6598:
6599: List part of a user's directory.
6600:
6601: =item pushtable
6602:
6603: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
6604: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
6605: must be restored manually in case of a problem with the new table file.
6606: pushtable requires that the request be encrypted and validated via
6607: ValidateManager. The form of the command is:
6608: enc:pushtable tablename <tablecontents> \n
6609: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
6610: cleartext newline.
6611:
6612: =item Hanging up (exit or init)
6613:
6614: What to do when a client tells the server that they (the client)
6615: are leaving the network.
6616:
6617: =item unknown command
6618:
6619: If B<lond> is sent an unknown command (not in the list above),
6620: it replys to the client "unknown_cmd".
6621:
6622:
6623: =item UNKNOWN CLIENT
6624:
6625: If the anti-spoofing algorithm cannot verify the client,
6626: the client is rejected (with a "refused" message sent
6627: to the client, and the connection is closed.
6628:
6629: =back
6630:
6631: =head1 PREREQUISITES
6632:
6633: IO::Socket
6634: IO::File
6635: Apache::File
6636: Symbol
6637: POSIX
6638: Crypt::IDEA
6639: LWP::UserAgent()
6640: GDBM_File
6641: Authen::Krb4
6642: Authen::Krb5
6643:
6644: =head1 COREQUISITES
6645:
6646: =head1 OSNAMES
6647:
6648: linux
6649:
6650: =head1 SCRIPT CATEGORIES
6651:
6652: Server/Process
6653:
6654: =cut
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