Annotation of loncom/lond, revision 1.265
1.1 albertel 1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
1.60 www 4: #
1.264 albertel 5: # $Id: lond,v 1.263 2004/10/21 16:05:50 albertel Exp $
1.60 www 6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
1.167 foxr 13: # the Free Software Foundation; either version 2 of the License, or
1.60 www 14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
1.178 foxr 23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1.60 www 24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
1.161 foxr 27:
28:
1.60 www 29: # http://www.lon-capa.org/
30: #
1.54 harris41 31:
1.134 albertel 32: use strict;
1.80 harris41 33: use lib '/home/httpd/lib/perl/';
34: use LONCAPA::Configuration;
35:
1.1 albertel 36: use IO::Socket;
37: use IO::File;
1.126 albertel 38: #use Apache::File;
1.1 albertel 39: use Symbol;
40: use POSIX;
41: use Crypt::IDEA;
42: use LWP::UserAgent();
1.3 www 43: use GDBM_File;
44: use Authen::Krb4;
1.91 albertel 45: use Authen::Krb5;
1.49 albertel 46: use lib '/home/httpd/lib/perl/';
47: use localauth;
1.193 raeburn 48: use localenroll;
1.265 ! albertel 49: use localstudentphoto;
1.143 foxr 50: use File::Copy;
1.169 foxr 51: use LONCAPA::ConfigFileEdit;
1.200 matthew 52: use LONCAPA::lonlocal;
53: use LONCAPA::lonssl;
1.221 albertel 54: use Fcntl qw(:flock);
1.1 albertel 55:
1.239 foxr 56: my $DEBUG = 0; # Non zero to enable debug log entries.
1.77 foxr 57:
1.57 www 58: my $status='';
59: my $lastlog='';
60:
1.264 albertel 61: my $VERSION='$Revision: 1.263 $'; #' stupid emacs
1.121 albertel 62: my $remoteVERSION;
1.214 foxr 63: my $currenthostid="default";
1.115 albertel 64: my $currentdomainid;
1.134 albertel 65:
66: my $client;
1.200 matthew 67: my $clientip; # IP address of client.
68: my $clientdns; # DNS name of client.
69: my $clientname; # LonCAPA name of client.
1.140 foxr 70:
1.134 albertel 71: my $server;
1.200 matthew 72: my $thisserver; # DNS of us.
73:
74: my $keymode;
1.198 foxr 75:
1.207 foxr 76: my $cipher; # Cipher key negotiated with client
77: my $tmpsnum = 0; # Id of tmpputs.
78:
1.178 foxr 79: #
80: # Connection type is:
81: # client - All client actions are allowed
82: # manager - only management functions allowed.
83: # both - Both management and client actions are allowed
84: #
1.161 foxr 85:
1.178 foxr 86: my $ConnectionType;
1.161 foxr 87:
1.200 matthew 88: my %hostid; # ID's for hosts in cluster by ip.
89: my %hostdom; # LonCAPA domain for hosts in cluster.
90: my %hostip; # IPs for hosts in cluster.
91: my %hostdns; # ID's of hosts looked up by DNS name.
1.161 foxr 92:
1.178 foxr 93: my %managers; # Ip -> manager names
1.161 foxr 94:
1.178 foxr 95: my %perlvar; # Will have the apache conf defined perl vars.
1.134 albertel 96:
1.178 foxr 97: #
1.207 foxr 98: # The hash below is used for command dispatching, and is therefore keyed on the request keyword.
99: # Each element of the hash contains a reference to an array that contains:
100: # A reference to a sub that executes the request corresponding to the keyword.
101: # A flag that is true if the request must be encoded to be acceptable.
102: # A mask with bits as follows:
103: # CLIENT_OK - Set when the function is allowed by ordinary clients
104: # MANAGER_OK - Set when the function is allowed to manager clients.
105: #
106: my $CLIENT_OK = 1;
107: my $MANAGER_OK = 2;
108: my %Dispatcher;
109:
110:
111: #
1.178 foxr 112: # The array below are password error strings."
113: #
114: my $lastpwderror = 13; # Largest error number from lcpasswd.
115: my @passwderrors = ("ok",
116: "lcpasswd must be run as user 'www'",
117: "lcpasswd got incorrect number of arguments",
118: "lcpasswd did not get the right nubmer of input text lines",
119: "lcpasswd too many simultaneous pwd changes in progress",
120: "lcpasswd User does not exist.",
121: "lcpasswd Incorrect current passwd",
122: "lcpasswd Unable to su to root.",
123: "lcpasswd Cannot set new passwd.",
124: "lcpasswd Username has invalid characters",
125: "lcpasswd Invalid characters in password",
1.223 foxr 126: "lcpasswd User already exists",
127: "lcpasswd Something went wrong with user addition.",
128: "lcpasswd Password mismatch",
129: "lcpasswd Error filename is invalid");
1.97 foxr 130:
131:
1.178 foxr 132: # The array below are lcuseradd error strings.:
1.97 foxr 133:
1.178 foxr 134: my $lastadderror = 13;
135: my @adderrors = ("ok",
136: "User ID mismatch, lcuseradd must run as user www",
137: "lcuseradd Incorrect number of command line parameters must be 3",
138: "lcuseradd Incorrect number of stdinput lines, must be 3",
139: "lcuseradd Too many other simultaneous pwd changes in progress",
140: "lcuseradd User does not exist",
141: "lcuseradd Unable to make www member of users's group",
142: "lcuseradd Unable to su to root",
143: "lcuseradd Unable to set password",
144: "lcuseradd Usrname has invalid characters",
145: "lcuseradd Password has an invalid character",
146: "lcuseradd User already exists",
147: "lcuseradd Could not add user.",
148: "lcuseradd Password mismatch");
1.97 foxr 149:
1.96 foxr 150:
1.207 foxr 151:
152: #
153: # Statistics that are maintained and dislayed in the status line.
154: #
1.212 foxr 155: my $Transactions = 0; # Number of attempted transactions.
156: my $Failures = 0; # Number of transcations failed.
1.207 foxr 157:
158: # ResetStatistics:
159: # Resets the statistics counters:
160: #
161: sub ResetStatistics {
162: $Transactions = 0;
163: $Failures = 0;
164: }
165:
1.200 matthew 166: #------------------------------------------------------------------------
167: #
168: # LocalConnection
169: # Completes the formation of a locally authenticated connection.
170: # This function will ensure that the 'remote' client is really the
171: # local host. If not, the connection is closed, and the function fails.
172: # If so, initcmd is parsed for the name of a file containing the
173: # IDEA session key. The fie is opened, read, deleted and the session
174: # key returned to the caller.
175: #
176: # Parameters:
177: # $Socket - Socket open on client.
178: # $initcmd - The full text of the init command.
179: #
180: # Implicit inputs:
181: # $clientdns - The DNS name of the remote client.
182: # $thisserver - Our DNS name.
183: #
184: # Returns:
185: # IDEA session key on success.
186: # undef on failure.
187: #
188: sub LocalConnection {
189: my ($Socket, $initcmd) = @_;
190: Debug("Attempting local connection: $initcmd client: $clientdns me: $thisserver");
191: if($clientdns ne $thisserver) {
192: &logthis('<font color="red"> LocalConnection rejecting non local: '
193: ."$clientdns ne $thisserver </font>");
194: close $Socket;
195: return undef;
1.224 foxr 196: } else {
1.200 matthew 197: chomp($initcmd); # Get rid of \n in filename.
198: my ($init, $type, $name) = split(/:/, $initcmd);
199: Debug(" Init command: $init $type $name ");
200:
201: # Require that $init = init, and $type = local: Otherwise
202: # the caller is insane:
203:
204: if(($init ne "init") && ($type ne "local")) {
205: &logthis('<font color = "red"> LocalConnection: caller is insane! '
206: ."init = $init, and type = $type </font>");
207: close($Socket);;
208: return undef;
209:
210: }
211: # Now get the key filename:
212:
213: my $IDEAKey = lonlocal::ReadKeyFile($name);
214: return $IDEAKey;
215: }
216: }
217: #------------------------------------------------------------------------------
218: #
219: # SSLConnection
220: # Completes the formation of an ssh authenticated connection. The
221: # socket is promoted to an ssl socket. If this promotion and the associated
222: # certificate exchange are successful, the IDEA key is generated and sent
223: # to the remote peer via the SSL tunnel. The IDEA key is also returned to
224: # the caller after the SSL tunnel is torn down.
225: #
226: # Parameters:
227: # Name Type Purpose
228: # $Socket IO::Socket::INET Plaintext socket.
229: #
230: # Returns:
231: # IDEA key on success.
232: # undef on failure.
233: #
234: sub SSLConnection {
235: my $Socket = shift;
236:
237: Debug("SSLConnection: ");
238: my $KeyFile = lonssl::KeyFile();
239: if(!$KeyFile) {
240: my $err = lonssl::LastError();
241: &logthis("<font color=\"red\"> CRITICAL"
242: ."Can't get key file $err </font>");
243: return undef;
244: }
245: my ($CACertificate,
246: $Certificate) = lonssl::CertificateFile();
247:
248:
249: # If any of the key, certificate or certificate authority
250: # certificate filenames are not defined, this can't work.
251:
252: if((!$Certificate) || (!$CACertificate)) {
253: my $err = lonssl::LastError();
254: &logthis("<font color=\"red\"> CRITICAL"
255: ."Can't get certificates: $err </font>");
256:
257: return undef;
258: }
259: Debug("Key: $KeyFile CA: $CACertificate Cert: $Certificate");
260:
261: # Indicate to our peer that we can procede with
262: # a transition to ssl authentication:
263:
264: print $Socket "ok:ssl\n";
265:
266: Debug("Approving promotion -> ssl");
267: # And do so:
268:
269: my $SSLSocket = lonssl::PromoteServerSocket($Socket,
270: $CACertificate,
271: $Certificate,
272: $KeyFile);
273: if(! ($SSLSocket) ) { # SSL socket promotion failed.
274: my $err = lonssl::LastError();
275: &logthis("<font color=\"red\"> CRITICAL "
276: ."SSL Socket promotion failed: $err </font>");
277: return undef;
278: }
279: Debug("SSL Promotion successful");
280:
281: #
282: # The only thing we'll use the socket for is to send the IDEA key
283: # to the peer:
284:
285: my $Key = lonlocal::CreateCipherKey();
286: print $SSLSocket "$Key\n";
287:
288: lonssl::Close($SSLSocket);
289:
290: Debug("Key exchange complete: $Key");
291:
292: return $Key;
293: }
294: #
295: # InsecureConnection:
296: # If insecure connections are allowd,
297: # exchange a challenge with the client to 'validate' the
298: # client (not really, but that's the protocol):
299: # We produce a challenge string that's sent to the client.
300: # The client must then echo the challenge verbatim to us.
301: #
302: # Parameter:
303: # Socket - Socket open on the client.
304: # Returns:
305: # 1 - success.
306: # 0 - failure (e.g.mismatch or insecure not allowed).
307: #
308: sub InsecureConnection {
309: my $Socket = shift;
310:
311: # Don't even start if insecure connections are not allowed.
312:
313: if(! $perlvar{londAllowInsecure}) { # Insecure connections not allowed.
314: return 0;
315: }
316:
317: # Fabricate a challenge string and send it..
318:
319: my $challenge = "$$".time; # pid + time.
320: print $Socket "$challenge\n";
321: &status("Waiting for challenge reply");
322:
323: my $answer = <$Socket>;
324: $answer =~s/\W//g;
325: if($challenge eq $answer) {
326: return 1;
1.224 foxr 327: } else {
1.200 matthew 328: logthis("<font color='blue'>WARNING client did not respond to challenge</font>");
329: &status("No challenge reqply");
330: return 0;
331: }
332:
333:
334: }
1.251 foxr 335: #
336: # Safely execute a command (as long as it's not a shel command and doesn
337: # not require/rely on shell escapes. The function operates by doing a
338: # a pipe based fork and capturing stdout and stderr from the pipe.
339: #
340: # Formal Parameters:
341: # $line - A line of text to be executed as a command.
342: # Returns:
343: # The output from that command. If the output is multiline the caller
344: # must know how to split up the output.
345: #
346: #
347: sub execute_command {
348: my ($line) = @_;
349: my @words = split(/\s/, $line); # Bust the command up into words.
350: my $output = "";
351:
352: my $pid = open(CHILD, "-|");
353:
354: if($pid) { # Parent process
355: Debug("In parent process for execute_command");
356: my @data = <CHILD>; # Read the child's outupt...
357: close CHILD;
358: foreach my $output_line (@data) {
359: Debug("Adding $output_line");
360: $output .= $output_line; # Presumably has a \n on it.
361: }
362:
363: } else { # Child process
364: close (STDERR);
365: open (STDERR, ">&STDOUT");# Combine stderr, and stdout...
366: exec(@words); # won't return.
367: }
368: return $output;
369: }
370:
1.200 matthew 371:
1.140 foxr 372: # GetCertificate: Given a transaction that requires a certificate,
373: # this function will extract the certificate from the transaction
374: # request. Note that at this point, the only concept of a certificate
375: # is the hostname to which we are connected.
376: #
377: # Parameter:
378: # request - The request sent by our client (this parameterization may
379: # need to change when we really use a certificate granting
380: # authority.
381: #
382: sub GetCertificate {
383: my $request = shift;
384:
385: return $clientip;
386: }
1.161 foxr 387:
1.178 foxr 388: #
389: # Return true if client is a manager.
390: #
391: sub isManager {
392: return (($ConnectionType eq "manager") || ($ConnectionType eq "both"));
393: }
394: #
395: # Return tru if client can do client functions
396: #
397: sub isClient {
398: return (($ConnectionType eq "client") || ($ConnectionType eq "both"));
399: }
1.161 foxr 400:
401:
1.156 foxr 402: #
403: # ReadManagerTable: Reads in the current manager table. For now this is
404: # done on each manager authentication because:
405: # - These authentications are not frequent
406: # - This allows dynamic changes to the manager table
407: # without the need to signal to the lond.
408: #
409: sub ReadManagerTable {
410:
411: # Clean out the old table first..
412:
1.166 foxr 413: foreach my $key (keys %managers) {
414: delete $managers{$key};
415: }
416:
417: my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
418: if (!open (MANAGERS, $tablename)) {
419: logthis('<font color="red">No manager table. Nobody can manage!!</font>');
420: return;
421: }
422: while(my $host = <MANAGERS>) {
423: chomp($host);
424: if ($host =~ "^#") { # Comment line.
425: next;
426: }
427: if (!defined $hostip{$host}) { # This is a non cluster member
1.161 foxr 428: # The entry is of the form:
429: # cluname:hostname
430: # cluname - A 'cluster hostname' is needed in order to negotiate
431: # the host key.
432: # hostname- The dns name of the host.
433: #
1.166 foxr 434: my($cluname, $dnsname) = split(/:/, $host);
435:
436: my $ip = gethostbyname($dnsname);
437: if(defined($ip)) { # bad names don't deserve entry.
438: my $hostip = inet_ntoa($ip);
439: $managers{$hostip} = $cluname;
440: logthis('<font color="green"> registering manager '.
441: "$dnsname as $cluname with $hostip </font>\n");
442: }
443: } else {
444: logthis('<font color="green"> existing host'." $host</font>\n");
445: $managers{$hostip{$host}} = $host; # Use info from cluster tab if clumemeber
446: }
447: }
1.156 foxr 448: }
1.140 foxr 449:
450: #
451: # ValidManager: Determines if a given certificate represents a valid manager.
452: # in this primitive implementation, the 'certificate' is
453: # just the connecting loncapa client name. This is checked
454: # against a valid client list in the configuration.
455: #
456: #
457: sub ValidManager {
458: my $certificate = shift;
459:
1.163 foxr 460: return isManager;
1.140 foxr 461: }
462: #
1.143 foxr 463: # CopyFile: Called as part of the process of installing a
464: # new configuration file. This function copies an existing
465: # file to a backup file.
466: # Parameters:
467: # oldfile - Name of the file to backup.
468: # newfile - Name of the backup file.
469: # Return:
470: # 0 - Failure (errno has failure reason).
471: # 1 - Success.
472: #
473: sub CopyFile {
1.192 foxr 474:
475: my ($oldfile, $newfile) = @_;
1.143 foxr 476:
477: # The file must exist:
478:
479: if(-e $oldfile) {
480:
481: # Read the old file.
482:
483: my $oldfh = IO::File->new("< $oldfile");
484: if(!$oldfh) {
485: return 0;
486: }
487: my @contents = <$oldfh>; # Suck in the entire file.
488:
489: # write the backup file:
490:
491: my $newfh = IO::File->new("> $newfile");
492: if(!(defined $newfh)){
493: return 0;
494: }
495: my $lines = scalar @contents;
496: for (my $i =0; $i < $lines; $i++) {
497: print $newfh ($contents[$i]);
498: }
499:
500: $oldfh->close;
501: $newfh->close;
502:
503: chmod(0660, $newfile);
504:
505: return 1;
506:
507: } else {
508: return 0;
509: }
510: }
1.157 foxr 511: #
512: # Host files are passed out with externally visible host IPs.
513: # If, for example, we are behind a fire-wall or NAT host, our
514: # internally visible IP may be different than the externally
515: # visible IP. Therefore, we always adjust the contents of the
516: # host file so that the entry for ME is the IP that we believe
517: # we have. At present, this is defined as the entry that
518: # DNS has for us. If by some chance we are not able to get a
519: # DNS translation for us, then we assume that the host.tab file
520: # is correct.
521: # BUGBUGBUG - in the future, we really should see if we can
522: # easily query the interface(s) instead.
523: # Parameter(s):
524: # contents - The contents of the host.tab to check.
525: # Returns:
526: # newcontents - The adjusted contents.
527: #
528: #
529: sub AdjustHostContents {
530: my $contents = shift;
531: my $adjusted;
532: my $me = $perlvar{'lonHostID'};
533:
1.166 foxr 534: foreach my $line (split(/\n/,$contents)) {
1.157 foxr 535: if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
536: chomp($line);
537: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
538: if ($id eq $me) {
1.166 foxr 539: my $ip = gethostbyname($name);
540: my $ipnew = inet_ntoa($ip);
541: $ip = $ipnew;
1.157 foxr 542: # Reconstruct the host line and append to adjusted:
543:
1.166 foxr 544: my $newline = "$id:$domain:$role:$name:$ip";
545: if($maxcon ne "") { # Not all hosts have loncnew tuning params
546: $newline .= ":$maxcon:$idleto:$mincon";
547: }
548: $adjusted .= $newline."\n";
1.157 foxr 549:
1.166 foxr 550: } else { # Not me, pass unmodified.
551: $adjusted .= $line."\n";
552: }
1.157 foxr 553: } else { # Blank or comment never re-written.
554: $adjusted .= $line."\n"; # Pass blanks and comments as is.
555: }
1.166 foxr 556: }
557: return $adjusted;
1.157 foxr 558: }
1.143 foxr 559: #
560: # InstallFile: Called to install an administrative file:
561: # - The file is created with <name>.tmp
562: # - The <name>.tmp file is then mv'd to <name>
563: # This lugubrious procedure is done to ensure that we are never without
564: # a valid, even if dated, version of the file regardless of who crashes
565: # and when the crash occurs.
566: #
567: # Parameters:
568: # Name of the file
569: # File Contents.
570: # Return:
571: # nonzero - success.
572: # 0 - failure and $! has an errno.
573: #
574: sub InstallFile {
1.192 foxr 575:
576: my ($Filename, $Contents) = @_;
1.143 foxr 577: my $TempFile = $Filename.".tmp";
578:
579: # Open the file for write:
580:
581: my $fh = IO::File->new("> $TempFile"); # Write to temp.
582: if(!(defined $fh)) {
583: &logthis('<font color="red"> Unable to create '.$TempFile."</font>");
584: return 0;
585: }
586: # write the contents of the file:
587:
588: print $fh ($Contents);
589: $fh->close; # In case we ever have a filesystem w. locking
590:
591: chmod(0660, $TempFile);
592:
593: # Now we can move install the file in position.
594:
595: move($TempFile, $Filename);
596:
597: return 1;
598: }
1.200 matthew 599:
600:
1.169 foxr 601: #
602: # ConfigFileFromSelector: converts a configuration file selector
603: # (one of host or domain at this point) into a
604: # configuration file pathname.
605: #
606: # Parameters:
607: # selector - Configuration file selector.
608: # Returns:
609: # Full path to the file or undef if the selector is invalid.
610: #
611: sub ConfigFileFromSelector {
612: my $selector = shift;
613: my $tablefile;
614:
615: my $tabledir = $perlvar{'lonTabDir'}.'/';
616: if ($selector eq "hosts") {
617: $tablefile = $tabledir."hosts.tab";
618: } elsif ($selector eq "domain") {
619: $tablefile = $tabledir."domain.tab";
620: } else {
621: return undef;
622: }
623: return $tablefile;
1.143 foxr 624:
1.169 foxr 625: }
1.143 foxr 626: #
1.141 foxr 627: # PushFile: Called to do an administrative push of a file.
628: # - Ensure the file being pushed is one we support.
629: # - Backup the old file to <filename.saved>
630: # - Separate the contents of the new file out from the
631: # rest of the request.
632: # - Write the new file.
633: # Parameter:
634: # Request - The entire user request. This consists of a : separated
635: # string pushfile:tablename:contents.
636: # NOTE: The contents may have :'s in it as well making things a bit
637: # more interesting... but not much.
638: # Returns:
639: # String to send to client ("ok" or "refused" if bad file).
640: #
641: sub PushFile {
642: my $request = shift;
643: my ($command, $filename, $contents) = split(":", $request, 3);
644:
645: # At this point in time, pushes for only the following tables are
646: # supported:
647: # hosts.tab ($filename eq host).
648: # domain.tab ($filename eq domain).
649: # Construct the destination filename or reject the request.
650: #
651: # lonManage is supposed to ensure this, however this session could be
652: # part of some elaborate spoof that managed somehow to authenticate.
653: #
654:
1.169 foxr 655:
656: my $tablefile = ConfigFileFromSelector($filename);
657: if(! (defined $tablefile)) {
1.141 foxr 658: return "refused";
659: }
660: #
661: # >copy< the old table to the backup table
662: # don't rename in case system crashes/reboots etc. in the time
663: # window between a rename and write.
664: #
665: my $backupfile = $tablefile;
666: $backupfile =~ s/\.tab$/.old/;
1.143 foxr 667: if(!CopyFile($tablefile, $backupfile)) {
668: &logthis('<font color="green"> CopyFile from '.$tablefile." to ".$backupfile." failed </font>");
669: return "error:$!";
670: }
1.141 foxr 671: &logthis('<font color="green"> Pushfile: backed up '
672: .$tablefile." to $backupfile</font>");
673:
1.157 foxr 674: # If the file being pushed is the host file, we adjust the entry for ourself so that the
675: # IP will be our current IP as looked up in dns. Note this is only 99% good as it's possible
676: # to conceive of conditions where we don't have a DNS entry locally. This is possible in a
677: # network sense but it doesn't make much sense in a LonCAPA sense so we ignore (for now)
678: # that possibilty.
679:
680: if($filename eq "host") {
681: $contents = AdjustHostContents($contents);
682: }
683:
1.141 foxr 684: # Install the new file:
685:
1.143 foxr 686: if(!InstallFile($tablefile, $contents)) {
687: &logthis('<font color="red"> Pushfile: unable to install '
1.145 foxr 688: .$tablefile." $! </font>");
1.143 foxr 689: return "error:$!";
1.224 foxr 690: } else {
1.143 foxr 691: &logthis('<font color="green"> Installed new '.$tablefile
692: ."</font>");
693:
694: }
695:
1.141 foxr 696:
697: # Indicate success:
698:
699: return "ok";
700:
701: }
1.145 foxr 702:
703: #
704: # Called to re-init either lonc or lond.
705: #
706: # Parameters:
707: # request - The full request by the client. This is of the form
708: # reinit:<process>
709: # where <process> is allowed to be either of
710: # lonc or lond
711: #
712: # Returns:
713: # The string to be sent back to the client either:
714: # ok - Everything worked just fine.
715: # error:why - There was a failure and why describes the reason.
716: #
717: #
718: sub ReinitProcess {
719: my $request = shift;
720:
1.146 foxr 721:
722: # separate the request (reinit) from the process identifier and
723: # validate it producing the name of the .pid file for the process.
724: #
725: #
726: my ($junk, $process) = split(":", $request);
1.147 foxr 727: my $processpidfile = $perlvar{'lonDaemons'}.'/logs/';
1.146 foxr 728: if($process eq 'lonc') {
729: $processpidfile = $processpidfile."lonc.pid";
1.147 foxr 730: if (!open(PIDFILE, "< $processpidfile")) {
731: return "error:Open failed for $processpidfile";
732: }
733: my $loncpid = <PIDFILE>;
734: close(PIDFILE);
735: logthis('<font color="red"> Reinitializing lonc pid='.$loncpid
736: ."</font>");
737: kill("USR2", $loncpid);
1.146 foxr 738: } elsif ($process eq 'lond') {
1.147 foxr 739: logthis('<font color="red"> Reinitializing self (lond) </font>');
740: &UpdateHosts; # Lond is us!!
1.146 foxr 741: } else {
742: &logthis('<font color="yellow" Invalid reinit request for '.$process
743: ."</font>");
744: return "error:Invalid process identifier $process";
745: }
1.145 foxr 746: return 'ok';
747: }
1.168 foxr 748: # Validate a line in a configuration file edit script:
749: # Validation includes:
750: # - Ensuring the command is valid.
751: # - Ensuring the command has sufficient parameters
752: # Parameters:
753: # scriptline - A line to validate (\n has been stripped for what it's worth).
1.167 foxr 754: #
1.168 foxr 755: # Return:
756: # 0 - Invalid scriptline.
757: # 1 - Valid scriptline
758: # NOTE:
759: # Only the command syntax is checked, not the executability of the
760: # command.
761: #
762: sub isValidEditCommand {
763: my $scriptline = shift;
764:
765: # Line elements are pipe separated:
766:
767: my ($command, $key, $newline) = split(/\|/, $scriptline);
768: &logthis('<font color="green"> isValideditCommand checking: '.
769: "Command = '$command', Key = '$key', Newline = '$newline' </font>\n");
770:
771: if ($command eq "delete") {
772: #
773: # key with no newline.
774: #
775: if( ($key eq "") || ($newline ne "")) {
776: return 0; # Must have key but no newline.
777: } else {
778: return 1; # Valid syntax.
779: }
1.169 foxr 780: } elsif ($command eq "replace") {
1.168 foxr 781: #
782: # key and newline:
783: #
784: if (($key eq "") || ($newline eq "")) {
785: return 0;
786: } else {
787: return 1;
788: }
1.169 foxr 789: } elsif ($command eq "append") {
790: if (($key ne "") && ($newline eq "")) {
791: return 1;
792: } else {
793: return 0;
794: }
1.168 foxr 795: } else {
796: return 0; # Invalid command.
797: }
798: return 0; # Should not get here!!!
799: }
1.169 foxr 800: #
801: # ApplyEdit - Applies an edit command to a line in a configuration
802: # file. It is the caller's responsiblity to validate the
803: # edit line.
804: # Parameters:
805: # $directive - A single edit directive to apply.
806: # Edit directives are of the form:
807: # append|newline - Appends a new line to the file.
808: # replace|key|newline - Replaces the line with key value 'key'
809: # delete|key - Deletes the line with key value 'key'.
810: # $editor - A config file editor object that contains the
811: # file being edited.
812: #
813: sub ApplyEdit {
1.192 foxr 814:
815: my ($directive, $editor) = @_;
1.169 foxr 816:
817: # Break the directive down into its command and its parameters
818: # (at most two at this point. The meaning of the parameters, if in fact
819: # they exist depends on the command).
820:
821: my ($command, $p1, $p2) = split(/\|/, $directive);
822:
823: if($command eq "append") {
824: $editor->Append($p1); # p1 - key p2 null.
825: } elsif ($command eq "replace") {
826: $editor->ReplaceLine($p1, $p2); # p1 - key p2 = newline.
827: } elsif ($command eq "delete") {
828: $editor->DeleteLine($p1); # p1 - key p2 null.
829: } else { # Should not get here!!!
830: die "Invalid command given to ApplyEdit $command"
831: }
832: }
833: #
834: # AdjustOurHost:
835: # Adjusts a host file stored in a configuration file editor object
836: # for the true IP address of this host. This is necessary for hosts
837: # that live behind a firewall.
838: # Those hosts have a publicly distributed IP of the firewall, but
839: # internally must use their actual IP. We assume that a given
840: # host only has a single IP interface for now.
841: # Formal Parameters:
842: # editor - The configuration file editor to adjust. This
843: # editor is assumed to contain a hosts.tab file.
844: # Strategy:
845: # - Figure out our hostname.
846: # - Lookup the entry for this host.
847: # - Modify the line to contain our IP
848: # - Do a replace for this host.
849: sub AdjustOurHost {
850: my $editor = shift;
851:
852: # figure out who I am.
853:
854: my $myHostName = $perlvar{'lonHostID'}; # LonCAPA hostname.
855:
856: # Get my host file entry.
857:
858: my $ConfigLine = $editor->Find($myHostName);
859: if(! (defined $ConfigLine)) {
860: die "AdjustOurHost - no entry for me in hosts file $myHostName";
861: }
862: # figure out my IP:
863: # Use the config line to get my hostname.
864: # Use gethostbyname to translate that into an IP address.
865: #
866: my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon) = split(/:/,$ConfigLine);
867: my $BinaryIp = gethostbyname($name);
868: my $ip = inet_ntoa($ip);
869: #
870: # Reassemble the config line from the elements in the list.
871: # Note that if the loncnew items were not present before, they will
872: # be now even if they would be empty
873: #
874: my $newConfigLine = $id;
875: foreach my $item ($domain, $role, $name, $ip, $maxcon, $idleto, $mincon) {
876: $newConfigLine .= ":".$item;
877: }
878: # Replace the line:
879:
880: $editor->ReplaceLine($id, $newConfigLine);
881:
882: }
883: #
884: # ReplaceConfigFile:
885: # Replaces a configuration file with the contents of a
886: # configuration file editor object.
887: # This is done by:
888: # - Copying the target file to <filename>.old
889: # - Writing the new file to <filename>.tmp
890: # - Moving <filename.tmp> -> <filename>
891: # This laborious process ensures that the system is never without
892: # a configuration file that's at least valid (even if the contents
893: # may be dated).
894: # Parameters:
895: # filename - Name of the file to modify... this is a full path.
896: # editor - Editor containing the file.
897: #
898: sub ReplaceConfigFile {
1.192 foxr 899:
900: my ($filename, $editor) = @_;
1.168 foxr 901:
1.169 foxr 902: CopyFile ($filename, $filename.".old");
903:
904: my $contents = $editor->Get(); # Get the contents of the file.
905:
906: InstallFile($filename, $contents);
907: }
1.168 foxr 908: #
909: #
910: # Called to edit a configuration table file
1.167 foxr 911: # Parameters:
912: # request - The entire command/request sent by lonc or lonManage
913: # Return:
914: # The reply to send to the client.
1.168 foxr 915: #
1.167 foxr 916: sub EditFile {
917: my $request = shift;
918:
919: # Split the command into it's pieces: edit:filetype:script
920:
1.168 foxr 921: my ($request, $filetype, $script) = split(/:/, $request,3); # : in script
1.167 foxr 922:
923: # Check the pre-coditions for success:
924:
925: if($request != "edit") { # Something is amiss afoot alack.
926: return "error:edit request detected, but request != 'edit'\n";
927: }
928: if( ($filetype ne "hosts") &&
929: ($filetype ne "domain")) {
930: return "error:edit requested with invalid file specifier: $filetype \n";
931: }
932:
933: # Split the edit script and check it's validity.
1.168 foxr 934:
935: my @scriptlines = split(/\n/, $script); # one line per element.
936: my $linecount = scalar(@scriptlines);
937: for(my $i = 0; $i < $linecount; $i++) {
938: chomp($scriptlines[$i]);
939: if(!isValidEditCommand($scriptlines[$i])) {
940: return "error:edit with bad script line: '$scriptlines[$i]' \n";
941: }
942: }
1.145 foxr 943:
1.167 foxr 944: # Execute the edit operation.
1.169 foxr 945: # - Create a config file editor for the appropriate file and
946: # - execute each command in the script:
947: #
948: my $configfile = ConfigFileFromSelector($filetype);
949: if (!(defined $configfile)) {
950: return "refused\n";
951: }
952: my $editor = ConfigFileEdit->new($configfile);
1.167 foxr 953:
1.169 foxr 954: for (my $i = 0; $i < $linecount; $i++) {
955: ApplyEdit($scriptlines[$i], $editor);
956: }
957: # If the file is the host file, ensure that our host is
958: # adjusted to have our ip:
959: #
960: if($filetype eq "host") {
961: AdjustOurHost($editor);
962: }
963: # Finally replace the current file with our file.
964: #
965: ReplaceConfigFile($configfile, $editor);
1.167 foxr 966:
967: return "ok\n";
968: }
1.207 foxr 969:
970: #---------------------------------------------------------------
971: #
972: # Manipulation of hash based databases (factoring out common code
973: # for later use as we refactor.
974: #
975: # Ties a domain level resource file to a hash.
976: # If requested a history entry is created in the associated hist file.
977: #
978: # Parameters:
979: # domain - Name of the domain in which the resource file lives.
980: # namespace - Name of the hash within that domain.
981: # how - How to tie the hash (e.g. GDBM_WRCREAT()).
982: # loghead - Optional parameter, if present a log entry is created
983: # in the associated history file and this is the first part
984: # of that entry.
985: # logtail - Goes along with loghead, The actual logentry is of the
986: # form $loghead:<timestamp>:logtail.
987: # Returns:
988: # Reference to a hash bound to the db file or alternatively undef
989: # if the tie failed.
990: #
1.209 albertel 991: sub tie_domain_hash {
1.210 albertel 992: my ($domain,$namespace,$how,$loghead,$logtail) = @_;
1.207 foxr 993:
994: # Filter out any whitespace in the domain name:
995:
996: $domain =~ s/\W//g;
997:
998: # We have enough to go on to tie the hash:
999:
1000: my $user_top_dir = $perlvar{'lonUsersDir'};
1001: my $domain_dir = $user_top_dir."/$domain";
1002: my $resource_file = $domain_dir."/$namespace.db";
1003: my %hash;
1004: if(tie(%hash, 'GDBM_File', $resource_file, $how, 0640)) {
1.211 albertel 1005: if (defined($loghead)) { # Need to log the operation.
1.210 albertel 1006: my $logFh = IO::File->new(">>$domain_dir/$namespace.hist");
1.207 foxr 1007: if($logFh) {
1008: my $timestamp = time;
1009: print $logFh "$loghead:$timestamp:$logtail\n";
1010: }
1.210 albertel 1011: $logFh->close;
1.207 foxr 1012: }
1013: return \%hash; # Return the tied hash.
1.210 albertel 1014: } else {
1.207 foxr 1015: return undef; # Tie failed.
1016: }
1017: }
1018:
1019: #
1020: # Ties a user's resource file to a hash.
1021: # If necessary, an appropriate history
1022: # log file entry is made as well.
1023: # This sub factors out common code from the subs that manipulate
1024: # the various gdbm files that keep keyword value pairs.
1025: # Parameters:
1026: # domain - Name of the domain the user is in.
1027: # user - Name of the 'current user'.
1028: # namespace - Namespace representing the file to tie.
1029: # how - What the tie is done to (e.g. GDBM_WRCREAT().
1030: # loghead - Optional first part of log entry if there may be a
1031: # history file.
1032: # what - Optional tail of log entry if there may be a history
1033: # file.
1034: # Returns:
1035: # hash to which the database is tied. It's up to the caller to untie.
1036: # undef if the has could not be tied.
1037: #
1.210 albertel 1038: sub tie_user_hash {
1039: my ($domain,$user,$namespace,$how,$loghead,$what) = @_;
1.207 foxr 1040:
1041: $namespace=~s/\//\_/g; # / -> _
1042: $namespace=~s/\W//g; # whitespace eliminated.
1043: my $proname = propath($domain, $user);
1044:
1045: # Tie the database.
1046:
1047: my %hash;
1048: if(tie(%hash, 'GDBM_File', "$proname/$namespace.db",
1049: $how, 0640)) {
1.209 albertel 1050: # If this is a namespace for which a history is kept,
1051: # make the history log entry:
1.252 albertel 1052: if (($namespace !~/^nohist\_/) && (defined($loghead))) {
1.209 albertel 1053: my $args = scalar @_;
1054: Debug(" Opening history: $namespace $args");
1055: my $hfh = IO::File->new(">>$proname/$namespace.hist");
1056: if($hfh) {
1057: my $now = time;
1058: print $hfh "$loghead:$now:$what\n";
1059: }
1.210 albertel 1060: $hfh->close;
1.209 albertel 1061: }
1.207 foxr 1062: return \%hash;
1.209 albertel 1063: } else {
1.207 foxr 1064: return undef;
1065: }
1066:
1067: }
1.214 foxr 1068:
1.255 foxr 1069: # read_profile
1070: #
1071: # Returns a set of specific entries from a user's profile file.
1072: # this is a utility function that is used by both get_profile_entry and
1073: # get_profile_entry_encrypted.
1074: #
1075: # Parameters:
1076: # udom - Domain in which the user exists.
1077: # uname - User's account name (loncapa account)
1078: # namespace - The profile namespace to open.
1079: # what - A set of & separated queries.
1080: # Returns:
1081: # If all ok: - The string that needs to be shipped back to the user.
1082: # If failure - A string that starts with error: followed by the failure
1083: # reason.. note that this probabyl gets shipped back to the
1084: # user as well.
1085: #
1086: sub read_profile {
1087: my ($udom, $uname, $namespace, $what) = @_;
1088:
1089: my $hashref = &tie_user_hash($udom, $uname, $namespace,
1090: &GDBM_READER());
1091: if ($hashref) {
1092: my @queries=split(/\&/,$what);
1093: my $qresult='';
1094:
1095: for (my $i=0;$i<=$#queries;$i++) {
1096: $qresult.="$hashref->{$queries[$i]}&"; # Presumably failure gives empty string.
1097: }
1098: $qresult=~s/\&$//; # Remove trailing & from last lookup.
1099: if (untie %$hashref) {
1100: return $qresult;
1101: } else {
1102: return "error: ".($!+0)." untie (GDBM) Failed";
1103: }
1104: } else {
1105: if ($!+0 == 2) {
1106: return "error:No such file or GDBM reported bad block error";
1107: } else {
1108: return "error: ".($!+0)." tie (GDBM) Failed";
1109: }
1110: }
1111:
1112: }
1.214 foxr 1113: #--------------------- Request Handlers --------------------------------------------
1114: #
1.215 foxr 1115: # By convention each request handler registers itself prior to the sub
1116: # declaration:
1.214 foxr 1117: #
1118:
1.216 foxr 1119: #++
1120: #
1.214 foxr 1121: # Handles ping requests.
1122: # Parameters:
1123: # $cmd - the actual keyword that invoked us.
1124: # $tail - the tail of the request that invoked us.
1125: # $replyfd- File descriptor connected to the client
1126: # Implicit Inputs:
1127: # $currenthostid - Global variable that carries the name of the host we are
1128: # known as.
1129: # Returns:
1130: # 1 - Ok to continue processing.
1131: # 0 - Program should exit.
1132: # Side effects:
1133: # Reply information is sent to the client.
1134: sub ping_handler {
1135: my ($cmd, $tail, $client) = @_;
1136: Debug("$cmd $tail $client .. $currenthostid:");
1137:
1138: Reply( $client,"$currenthostid\n","$cmd:$tail");
1139:
1140: return 1;
1141: }
1142: ®ister_handler("ping", \&ping_handler, 0, 1, 1); # Ping unencoded, client or manager.
1143:
1.216 foxr 1144: #++
1.215 foxr 1145: #
1146: # Handles pong requests. Pong replies with our current host id, and
1147: # the results of a ping sent to us via our lonc.
1148: #
1149: # Parameters:
1150: # $cmd - the actual keyword that invoked us.
1151: # $tail - the tail of the request that invoked us.
1152: # $replyfd- File descriptor connected to the client
1153: # Implicit Inputs:
1154: # $currenthostid - Global variable that carries the name of the host we are
1155: # connected to.
1156: # Returns:
1157: # 1 - Ok to continue processing.
1158: # 0 - Program should exit.
1159: # Side effects:
1160: # Reply information is sent to the client.
1161: sub pong_handler {
1162: my ($cmd, $tail, $replyfd) = @_;
1163:
1164: my $reply=&reply("ping",$clientname);
1165: &Reply( $replyfd, "$currenthostid:$reply\n", "$cmd:$tail");
1166: return 1;
1167: }
1168: ®ister_handler("pong", \&pong_handler, 0, 1, 1); # Pong unencoded, client or manager
1169:
1.216 foxr 1170: #++
1171: # Called to establish an encrypted session key with the remote client.
1172: # Note that with secure lond, in most cases this function is never
1173: # invoked. Instead, the secure session key is established either
1174: # via a local file that's locked down tight and only lives for a short
1175: # time, or via an ssl tunnel...and is generated from a bunch-o-random
1176: # bits from /dev/urandom, rather than the predictable pattern used by
1177: # by this sub. This sub is only used in the old-style insecure
1178: # key negotiation.
1179: # Parameters:
1180: # $cmd - the actual keyword that invoked us.
1181: # $tail - the tail of the request that invoked us.
1182: # $replyfd- File descriptor connected to the client
1183: # Implicit Inputs:
1184: # $currenthostid - Global variable that carries the name of the host
1185: # known as.
1186: # $clientname - Global variable that carries the name of the hsot we're connected to.
1187: # Returns:
1188: # 1 - Ok to continue processing.
1189: # 0 - Program should exit.
1190: # Implicit Outputs:
1191: # Reply information is sent to the client.
1192: # $cipher is set with a reference to a new IDEA encryption object.
1193: #
1194: sub establish_key_handler {
1195: my ($cmd, $tail, $replyfd) = @_;
1196:
1197: my $buildkey=time.$$.int(rand 100000);
1198: $buildkey=~tr/1-6/A-F/;
1199: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
1200: my $key=$currenthostid.$clientname;
1201: $key=~tr/a-z/A-Z/;
1202: $key=~tr/G-P/0-9/;
1203: $key=~tr/Q-Z/0-9/;
1204: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
1205: $key=substr($key,0,32);
1206: my $cipherkey=pack("H32",$key);
1207: $cipher=new IDEA $cipherkey;
1208: &Reply($replyfd, "$buildkey\n", "$cmd:$tail");
1209:
1210: return 1;
1211:
1212: }
1213: ®ister_handler("ekey", \&establish_key_handler, 0, 1,1);
1214:
1.217 foxr 1215: # Handler for the load command. Returns the current system load average
1216: # to the requestor.
1217: #
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: # $clientname - Global variable that carries the name of the hsot we're connected to.
1226: # Returns:
1227: # 1 - Ok to continue processing.
1228: # 0 - Program should exit.
1229: # Side effects:
1230: # Reply information is sent to the client.
1231: sub load_handler {
1232: my ($cmd, $tail, $replyfd) = @_;
1233:
1234: # Get the load average from /proc/loadavg and calculate it as a percentage of
1235: # the allowed load limit as set by the perl global variable lonLoadLim
1236:
1237: my $loadavg;
1238: my $loadfile=IO::File->new('/proc/loadavg');
1239:
1240: $loadavg=<$loadfile>;
1241: $loadavg =~ s/\s.*//g; # Extract the first field only.
1242:
1243: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
1244:
1245: &Reply( $replyfd, "$loadpercent\n", "$cmd:$tail");
1246:
1247: return 1;
1248: }
1.263 albertel 1249: ®ister_handler("load", \&load_handler, 0, 1, 0);
1.217 foxr 1250:
1251: #
1252: # Process the userload request. This sub returns to the client the current
1253: # user load average. It can be invoked either by clients or managers.
1254: #
1255: # Parameters:
1256: # $cmd - the actual keyword that invoked us.
1257: # $tail - the tail of the request that invoked us.
1258: # $replyfd- File descriptor connected to the client
1259: # Implicit Inputs:
1260: # $currenthostid - Global variable that carries the name of the host
1261: # known as.
1262: # $clientname - Global variable that carries the name of the hsot we're connected to.
1263: # Returns:
1264: # 1 - Ok to continue processing.
1265: # 0 - Program should exit
1266: # Implicit inputs:
1267: # whatever the userload() function requires.
1268: # Implicit outputs:
1269: # the reply is written to the client.
1270: #
1271: sub user_load_handler {
1272: my ($cmd, $tail, $replyfd) = @_;
1273:
1274: my $userloadpercent=&userload();
1275: &Reply($replyfd, "$userloadpercent\n", "$cmd:$tail");
1276:
1277: return 1;
1278: }
1.263 albertel 1279: ®ister_handler("userload", \&user_load_handler, 0, 1, 0);
1.217 foxr 1280:
1.218 foxr 1281: # Process a request for the authorization type of a user:
1282: # (userauth).
1283: #
1284: # Parameters:
1285: # $cmd - the actual keyword that invoked us.
1286: # $tail - the tail of the request that invoked us.
1287: # $replyfd- File descriptor connected to the client
1288: # Returns:
1289: # 1 - Ok to continue processing.
1290: # 0 - Program should exit
1291: # Implicit outputs:
1292: # The user authorization type is written to the client.
1293: #
1294: sub user_authorization_type {
1295: my ($cmd, $tail, $replyfd) = @_;
1296:
1297: my $userinput = "$cmd:$tail";
1298:
1299: # Pull the domain and username out of the command tail.
1.222 foxr 1300: # and call get_auth_type to determine the authentication type.
1.218 foxr 1301:
1302: my ($udom,$uname)=split(/:/,$tail);
1.222 foxr 1303: my $result = &get_auth_type($udom, $uname);
1.218 foxr 1304: if($result eq "nouser") {
1305: &Failure( $replyfd, "unknown_user\n", $userinput);
1306: } else {
1307: #
1.222 foxr 1308: # We only want to pass the second field from get_auth_type
1.218 foxr 1309: # for ^krb.. otherwise we'll be handing out the encrypted
1310: # password for internals e.g.
1311: #
1312: my ($type,$otherinfo) = split(/:/,$result);
1313: if($type =~ /^krb/) {
1314: $type = $result;
1315: }
1.222 foxr 1316: &Reply( $replyfd, "$type:\n", $userinput);
1.218 foxr 1317: }
1318:
1319: return 1;
1320: }
1321: ®ister_handler("currentauth", \&user_authorization_type, 1, 1, 0);
1322:
1323: # Process a request by a manager to push a hosts or domain table
1324: # to us. We pick apart the command and pass it on to the subs
1325: # that already exist to do this.
1326: #
1327: # Parameters:
1328: # $cmd - the actual keyword that invoked us.
1329: # $tail - the tail of the request that invoked us.
1330: # $client - File descriptor connected to the client
1331: # Returns:
1332: # 1 - Ok to continue processing.
1333: # 0 - Program should exit
1334: # Implicit Output:
1335: # a reply is written to the client.
1336: sub push_file_handler {
1337: my ($cmd, $tail, $client) = @_;
1338:
1339: my $userinput = "$cmd:$tail";
1340:
1341: # At this time we only know that the IP of our partner is a valid manager
1342: # the code below is a hook to do further authentication (e.g. to resolve
1343: # spoofing).
1344:
1345: my $cert = &GetCertificate($userinput);
1346: if(&ValidManager($cert)) {
1347:
1348: # Now presumably we have the bona fides of both the peer host and the
1349: # process making the request.
1350:
1351: my $reply = &PushFile($userinput);
1352: &Reply($client, "$reply\n", $userinput);
1353:
1354: } else {
1355: &Failure( $client, "refused\n", $userinput);
1356: }
1.219 foxr 1357: return 1;
1.218 foxr 1358: }
1359: ®ister_handler("pushfile", \&push_file_handler, 1, 0, 1);
1360:
1.243 banghart 1361: #
1362: # du - list the disk usuage of a directory recursively.
1363: #
1364: # note: stolen code from the ls file handler
1365: # under construction by Rick Banghart
1366: # .
1367: # Parameters:
1368: # $cmd - The command that dispatched us (du).
1369: # $ududir - The directory path to list... I'm not sure what this
1370: # is relative as things like ls:. return e.g.
1371: # no_such_dir.
1372: # $client - Socket open on the client.
1373: # Returns:
1374: # 1 - indicating that the daemon should not disconnect.
1375: # Side Effects:
1376: # The reply is written to $client.
1377: #
1378: sub du_handler {
1379: my ($cmd, $ududir, $client) = @_;
1.251 foxr 1380: my ($ududir) = split(/:/,$ududir); # Make 'telnet' testing easier.
1381: my $userinput = "$cmd:$ududir";
1382:
1.245 albertel 1383: if ($ududir=~/\.\./ || $ududir!~m|^/home/httpd/|) {
1384: &Failure($client,"refused\n","$cmd:$ududir");
1385: return 1;
1386: }
1.249 foxr 1387: # Since $ududir could have some nasties in it,
1388: # we will require that ududir is a valid
1389: # directory. Just in case someone tries to
1390: # slip us a line like .;(cd /home/httpd rm -rf*)
1391: # etc.
1392: #
1393: if (-d $ududir) {
1394: # And as Shakespeare would say to make
1.251 foxr 1395: # assurance double sure,
1396: # use execute_command to ensure that the command is not executed in
1397: # a shell that can screw us up.
1398:
1399: my $duout = execute_command("du -ks $ududir");
1.249 foxr 1400: $duout=~s/[^\d]//g; #preserve only the numbers
1401: &Reply($client,"$duout\n","$cmd:$ududir");
1402: } else {
1.251 foxr 1403:
1404: &Failure($client, "bad_directory:$ududir\n","$cmd:$ududir");
1405:
1.249 foxr 1406: }
1.243 banghart 1407: return 1;
1408: }
1409: ®ister_handler("du", \&du_handler, 0, 1, 0);
1.218 foxr 1410:
1.239 foxr 1411: #
1412: # ls - list the contents of a directory. For each file in the
1413: # selected directory the filename followed by the full output of
1414: # the stat function is returned. The returned info for each
1415: # file are separated by ':'. The stat fields are separated by &'s.
1416: # Parameters:
1417: # $cmd - The command that dispatched us (ls).
1418: # $ulsdir - The directory path to list... I'm not sure what this
1419: # is relative as things like ls:. return e.g.
1420: # no_such_dir.
1421: # $client - Socket open on the client.
1422: # Returns:
1423: # 1 - indicating that the daemon should not disconnect.
1424: # Side Effects:
1425: # The reply is written to $client.
1426: #
1427: sub ls_handler {
1428: my ($cmd, $ulsdir, $client) = @_;
1429:
1430: my $userinput = "$cmd:$ulsdir";
1431:
1432: my $obs;
1433: my $rights;
1434: my $ulsout='';
1435: my $ulsfn;
1436: if (-e $ulsdir) {
1437: if(-d $ulsdir) {
1438: if (opendir(LSDIR,$ulsdir)) {
1439: while ($ulsfn=readdir(LSDIR)) {
1440: undef $obs, $rights;
1441: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1442: #We do some obsolete checking here
1443: if(-e $ulsdir.'/'.$ulsfn.".meta") {
1444: open(FILE, $ulsdir.'/'.$ulsfn.".meta");
1445: my @obsolete=<FILE>;
1446: foreach my $obsolete (@obsolete) {
1447: if($obsolete =~ m|(<obsolete>)(on)|) { $obs = 1; }
1448: if($obsolete =~ m|(<copyright>)(default)|) { $rights = 1; }
1449: }
1450: }
1451: $ulsout.=$ulsfn.'&'.join('&',@ulsstats);
1452: if($obs eq '1') { $ulsout.="&1"; }
1453: else { $ulsout.="&0"; }
1454: if($rights eq '1') { $ulsout.="&1:"; }
1455: else { $ulsout.="&0:"; }
1456: }
1457: closedir(LSDIR);
1458: }
1459: } else {
1460: my @ulsstats=stat($ulsdir);
1461: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1462: }
1463: } else {
1464: $ulsout='no_such_dir';
1465: }
1466: if ($ulsout eq '') { $ulsout='empty'; }
1.249 foxr 1467: &Reply($client, "$ulsout\n", $userinput); # This supports debug logging.
1.239 foxr 1468:
1469: return 1;
1470:
1471: }
1472: ®ister_handler("ls", \&ls_handler, 0, 1, 0);
1473:
1.218 foxr 1474: # Process a reinit request. Reinit requests that either
1475: # lonc or lond be reinitialized so that an updated
1476: # host.tab or domain.tab can be processed.
1477: #
1478: # Parameters:
1479: # $cmd - the actual keyword that invoked us.
1480: # $tail - the tail of the request that invoked us.
1481: # $client - File descriptor connected to the client
1482: # Returns:
1483: # 1 - Ok to continue processing.
1484: # 0 - Program should exit
1485: # Implicit output:
1486: # a reply is sent to the client.
1487: #
1488: sub reinit_process_handler {
1489: my ($cmd, $tail, $client) = @_;
1490:
1491: my $userinput = "$cmd:$tail";
1492:
1493: my $cert = &GetCertificate($userinput);
1494: if(&ValidManager($cert)) {
1495: chomp($userinput);
1496: my $reply = &ReinitProcess($userinput);
1497: &Reply( $client, "$reply\n", $userinput);
1498: } else {
1499: &Failure( $client, "refused\n", $userinput);
1500: }
1501: return 1;
1502: }
1503: ®ister_handler("reinit", \&reinit_process_handler, 1, 0, 1);
1504:
1505: # Process the editing script for a table edit operation.
1506: # the editing operation must be encrypted and requested by
1507: # a manager host.
1508: #
1509: # Parameters:
1510: # $cmd - the actual keyword that invoked us.
1511: # $tail - the tail of the request that invoked us.
1512: # $client - File descriptor connected to the client
1513: # Returns:
1514: # 1 - Ok to continue processing.
1515: # 0 - Program should exit
1516: # Implicit output:
1517: # a reply is sent to the client.
1518: #
1519: sub edit_table_handler {
1520: my ($command, $tail, $client) = @_;
1521:
1522: my $userinput = "$command:$tail";
1523:
1524: my $cert = &GetCertificate($userinput);
1525: if(&ValidManager($cert)) {
1526: my($filetype, $script) = split(/:/, $tail);
1527: if (($filetype eq "hosts") ||
1528: ($filetype eq "domain")) {
1529: if($script ne "") {
1530: &Reply($client, # BUGBUG - EditFile
1531: &EditFile($userinput), # could fail.
1532: $userinput);
1533: } else {
1534: &Failure($client,"refused\n",$userinput);
1535: }
1536: } else {
1537: &Failure($client,"refused\n",$userinput);
1538: }
1539: } else {
1540: &Failure($client,"refused\n",$userinput);
1541: }
1542: return 1;
1543: }
1.263 albertel 1544: ®ister_handler("edit", \&edit_table_handler, 1, 0, 1);
1.218 foxr 1545:
1.220 foxr 1546: #
1547: # Authenticate a user against the LonCAPA authentication
1548: # database. Note that there are several authentication
1549: # possibilities:
1550: # - unix - The user can be authenticated against the unix
1551: # password file.
1552: # - internal - The user can be authenticated against a purely
1553: # internal per user password file.
1554: # - kerberos - The user can be authenticated against either a kerb4 or kerb5
1555: # ticket granting authority.
1556: # - user - The person tailoring LonCAPA can supply a user authentication
1557: # mechanism that is per system.
1558: #
1559: # Parameters:
1560: # $cmd - The command that got us here.
1561: # $tail - Tail of the command (remaining parameters).
1562: # $client - File descriptor connected to client.
1563: # Returns
1564: # 0 - Requested to exit, caller should shut down.
1565: # 1 - Continue processing.
1566: # Implicit inputs:
1567: # The authentication systems describe above have their own forms of implicit
1568: # input into the authentication process that are described above.
1569: #
1570: sub authenticate_handler {
1571: my ($cmd, $tail, $client) = @_;
1572:
1573:
1574: # Regenerate the full input line
1575:
1576: my $userinput = $cmd.":".$tail;
1577:
1578: # udom - User's domain.
1579: # uname - Username.
1580: # upass - User's password.
1581:
1582: my ($udom,$uname,$upass)=split(/:/,$tail);
1583: &Debug(" Authenticate domain = $udom, user = $uname, password = $upass");
1584: chomp($upass);
1585: $upass=&unescape($upass);
1586:
1587: my $pwdcorrect = &validate_user($udom, $uname, $upass);
1588: if($pwdcorrect) {
1589: &Reply( $client, "authorized\n", $userinput);
1590: #
1591: # Bad credentials: Failed to authorize
1592: #
1593: } else {
1594: &Failure( $client, "non_authorized\n", $userinput);
1595: }
1596:
1597: return 1;
1598: }
1.263 albertel 1599: ®ister_handler("auth", \&authenticate_handler, 1, 1, 0);
1.214 foxr 1600:
1.222 foxr 1601: #
1602: # Change a user's password. Note that this function is complicated by
1603: # the fact that a user may be authenticated in more than one way:
1604: # At present, we are not able to change the password for all types of
1605: # authentication methods. Only for:
1606: # unix - unix password or shadow passoword style authentication.
1607: # local - Locally written authentication mechanism.
1608: # For now, kerb4 and kerb5 password changes are not supported and result
1609: # in an error.
1610: # FUTURE WORK:
1611: # Support kerberos passwd changes?
1612: # Parameters:
1613: # $cmd - The command that got us here.
1614: # $tail - Tail of the command (remaining parameters).
1615: # $client - File descriptor connected to client.
1616: # Returns
1617: # 0 - Requested to exit, caller should shut down.
1618: # 1 - Continue processing.
1619: # Implicit inputs:
1620: # The authentication systems describe above have their own forms of implicit
1621: # input into the authentication process that are described above.
1622: sub change_password_handler {
1623: my ($cmd, $tail, $client) = @_;
1624:
1625: my $userinput = $cmd.":".$tail; # Reconstruct client's string.
1626:
1627: #
1628: # udom - user's domain.
1629: # uname - Username.
1630: # upass - Current password.
1631: # npass - New password.
1632:
1633: my ($udom,$uname,$upass,$npass)=split(/:/,$tail);
1634:
1635: $upass=&unescape($upass);
1636: $npass=&unescape($npass);
1637: &Debug("Trying to change password for $uname");
1638:
1639: # First require that the user can be authenticated with their
1640: # old password:
1641:
1642: my $validated = &validate_user($udom, $uname, $upass);
1643: if($validated) {
1644: my $realpasswd = &get_auth_type($udom, $uname); # Defined since authd.
1645:
1646: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
1647: if ($howpwd eq 'internal') {
1648: &Debug("internal auth");
1649: my $salt=time;
1650: $salt=substr($salt,6,2);
1651: my $ncpass=crypt($npass,$salt);
1652: if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
1653: &logthis("Result of password change for "
1654: ."$uname: pwchange_success");
1655: &Reply($client, "ok\n", $userinput);
1656: } else {
1657: &logthis("Unable to open $uname passwd "
1658: ."to change password");
1659: &Failure( $client, "non_authorized\n",$userinput);
1660: }
1661: } elsif ($howpwd eq 'unix') {
1662: # Unix means we have to access /etc/password
1663: &Debug("auth is unix");
1664: my $execdir=$perlvar{'lonDaemons'};
1665: &Debug("Opening lcpasswd pipeline");
1666: my $pf = IO::File->new("|$execdir/lcpasswd > "
1667: ."$perlvar{'lonDaemons'}"
1668: ."/logs/lcpasswd.log");
1669: print $pf "$uname\n$npass\n$npass\n";
1670: close $pf;
1671: my $err = $?;
1672: my $result = ($err>0 ? 'pwchange_failure' : 'ok');
1673: &logthis("Result of password change for $uname: ".
1674: &lcpasswdstrerror($?));
1675: &Reply($client, "$result\n", $userinput);
1676: } else {
1677: # this just means that the current password mode is not
1678: # one we know how to change (e.g the kerberos auth modes or
1679: # locally written auth handler).
1680: #
1681: &Failure( $client, "auth_mode_error\n", $userinput);
1682: }
1683:
1.224 foxr 1684: } else {
1.222 foxr 1685: &Failure( $client, "non_authorized\n", $userinput);
1686: }
1687:
1688: return 1;
1689: }
1.263 albertel 1690: ®ister_handler("passwd", \&change_password_handler, 1, 1, 0);
1.222 foxr 1691:
1.225 foxr 1692: #
1693: # Create a new user. User in this case means a lon-capa user.
1694: # The user must either already exist in some authentication realm
1695: # like kerberos or the /etc/passwd. If not, a user completely local to
1696: # this loncapa system is created.
1697: #
1698: # Parameters:
1699: # $cmd - The command that got us here.
1700: # $tail - Tail of the command (remaining parameters).
1701: # $client - File descriptor connected to client.
1702: # Returns
1703: # 0 - Requested to exit, caller should shut down.
1704: # 1 - Continue processing.
1705: # Implicit inputs:
1706: # The authentication systems describe above have their own forms of implicit
1707: # input into the authentication process that are described above.
1708: sub add_user_handler {
1709:
1710: my ($cmd, $tail, $client) = @_;
1711:
1712:
1713: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1714: my $userinput = $cmd.":".$tail; # Reconstruct the full request line.
1715:
1716: &Debug("cmd =".$cmd." $udom =".$udom." uname=".$uname);
1717:
1718:
1719: if($udom eq $currentdomainid) { # Reject new users for other domains...
1720:
1721: my $oldumask=umask(0077);
1722: chomp($npass);
1723: $npass=&unescape($npass);
1724: my $passfilename = &password_path($udom, $uname);
1725: &Debug("Password file created will be:".$passfilename);
1726: if (-e $passfilename) {
1727: &Failure( $client, "already_exists\n", $userinput);
1728: } else {
1729: my $fperror='';
1.264 albertel 1730: if (!&mkpath($passfilename)) {
1731: $fperror="error: ".($!+0)." mkdir failed while attempting "
1732: ."makeuser";
1.225 foxr 1733: }
1734: unless ($fperror) {
1735: my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
1736: &Reply($client, $result, $userinput); #BUGBUG - could be fail
1737: } else {
1738: &Failure($client, "$fperror\n", $userinput);
1739: }
1740: }
1741: umask($oldumask);
1742: } else {
1743: &Failure($client, "not_right_domain\n",
1744: $userinput); # Even if we are multihomed.
1745:
1746: }
1747: return 1;
1748:
1749: }
1750: ®ister_handler("makeuser", \&add_user_handler, 1, 1, 0);
1751:
1752: #
1753: # Change the authentication method of a user. Note that this may
1754: # also implicitly change the user's password if, for example, the user is
1755: # joining an existing authentication realm. Known authentication realms at
1756: # this time are:
1757: # internal - Purely internal password file (only loncapa knows this user)
1758: # local - Institutionally written authentication module.
1759: # unix - Unix user (/etc/passwd with or without /etc/shadow).
1760: # kerb4 - kerberos version 4
1761: # kerb5 - kerberos version 5
1762: #
1763: # Parameters:
1764: # $cmd - The command that got us here.
1765: # $tail - Tail of the command (remaining parameters).
1766: # $client - File descriptor connected to client.
1767: # Returns
1768: # 0 - Requested to exit, caller should shut down.
1769: # 1 - Continue processing.
1770: # Implicit inputs:
1771: # The authentication systems describe above have their own forms of implicit
1772: # input into the authentication process that are described above.
1773: #
1774: sub change_authentication_handler {
1775:
1776: my ($cmd, $tail, $client) = @_;
1777:
1778: my $userinput = "$cmd:$tail"; # Reconstruct user input.
1779:
1780: my ($udom,$uname,$umode,$npass)=split(/:/,$tail);
1781: &Debug("cmd = ".$cmd." domain= ".$udom."uname =".$uname." umode= ".$umode);
1782: if ($udom ne $currentdomainid) {
1783: &Failure( $client, "not_right_domain\n", $client);
1784: } else {
1785:
1786: chomp($npass);
1787:
1788: $npass=&unescape($npass);
1.261 foxr 1789: my $oldauth = &get_auth_type($udom, $uname); # Get old auth info.
1.225 foxr 1790: my $passfilename = &password_path($udom, $uname);
1791: if ($passfilename) { # Not allowed to create a new user!!
1792: my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
1.261 foxr 1793: #
1794: # If the current auth mode is internal, and the old auth mode was
1795: # unix, or krb*, and the user is an author for this domain,
1796: # re-run manage_permissions for that role in order to be able
1797: # to take ownership of the construction space back to www:www
1798: #
1799:
1800: if( ($oldauth =~ /^unix/) && ($umode eq "internal")) { # unix -> internal
1801: if(&is_author($udom, $uname)) {
1802: &Debug(" Need to manage author permissions...");
1803: &manage_permissions("/$udom/_au", $udom, $uname, "internal:");
1804: }
1805: }
1806:
1807:
1.225 foxr 1808: &Reply($client, $result, $userinput);
1809: } else {
1.251 foxr 1810: &Failure($client, "non_authorized\n", $userinput); # Fail the user now.
1.225 foxr 1811: }
1812: }
1813: return 1;
1814: }
1815: ®ister_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
1816:
1817: #
1818: # Determines if this is the home server for a user. The home server
1819: # for a user will have his/her lon-capa passwd file. Therefore all we need
1820: # to do is determine if this file exists.
1821: #
1822: # Parameters:
1823: # $cmd - The command that got us here.
1824: # $tail - Tail of the command (remaining parameters).
1825: # $client - File descriptor connected to client.
1826: # Returns
1827: # 0 - Requested to exit, caller should shut down.
1828: # 1 - Continue processing.
1829: # Implicit inputs:
1830: # The authentication systems describe above have their own forms of implicit
1831: # input into the authentication process that are described above.
1832: #
1833: sub is_home_handler {
1834: my ($cmd, $tail, $client) = @_;
1835:
1836: my $userinput = "$cmd:$tail";
1837:
1838: my ($udom,$uname)=split(/:/,$tail);
1839: chomp($uname);
1840: my $passfile = &password_filename($udom, $uname);
1841: if($passfile) {
1842: &Reply( $client, "found\n", $userinput);
1843: } else {
1844: &Failure($client, "not_found\n", $userinput);
1845: }
1846: return 1;
1847: }
1848: ®ister_handler("home", \&is_home_handler, 0,1,0);
1849:
1850: #
1851: # Process an update request for a resource?? I think what's going on here is
1852: # that a resource has been modified that we hold a subscription to.
1853: # If the resource is not local, then we must update, or at least invalidate our
1854: # cached copy of the resource.
1855: # FUTURE WORK:
1856: # I need to look at this logic carefully. My druthers would be to follow
1857: # typical caching logic, and simple invalidate the cache, drop any subscription
1858: # an let the next fetch start the ball rolling again... however that may
1859: # actually be more difficult than it looks given the complex web of
1860: # proxy servers.
1861: # Parameters:
1862: # $cmd - The command that got us here.
1863: # $tail - Tail of the command (remaining parameters).
1864: # $client - File descriptor connected to client.
1865: # Returns
1866: # 0 - Requested to exit, caller should shut down.
1867: # 1 - Continue processing.
1868: # Implicit inputs:
1869: # The authentication systems describe above have their own forms of implicit
1870: # input into the authentication process that are described above.
1871: #
1872: sub update_resource_handler {
1873:
1874: my ($cmd, $tail, $client) = @_;
1875:
1876: my $userinput = "$cmd:$tail";
1877:
1878: my $fname= $tail; # This allows interactive testing
1879:
1880:
1881: my $ownership=ishome($fname);
1882: if ($ownership eq 'not_owner') {
1883: if (-e $fname) {
1884: my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
1885: $atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
1886: my $now=time;
1887: my $since=$now-$atime;
1888: if ($since>$perlvar{'lonExpire'}) {
1889: my $reply=&reply("unsub:$fname","$clientname");
1890: unlink("$fname");
1891: } else {
1892: my $transname="$fname.in.transfer";
1893: my $remoteurl=&reply("sub:$fname","$clientname");
1894: my $response;
1895: alarm(120);
1896: {
1897: my $ua=new LWP::UserAgent;
1898: my $request=new HTTP::Request('GET',"$remoteurl");
1899: $response=$ua->request($request,$transname);
1900: }
1901: alarm(0);
1902: if ($response->is_error()) {
1903: unlink($transname);
1904: my $message=$response->status_line;
1905: &logthis("LWP GET: $message for $fname ($remoteurl)");
1906: } else {
1907: if ($remoteurl!~/\.meta$/) {
1908: alarm(120);
1909: {
1910: my $ua=new LWP::UserAgent;
1911: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
1912: my $mresponse=$ua->request($mrequest,$fname.'.meta');
1913: if ($mresponse->is_error()) {
1914: unlink($fname.'.meta');
1915: }
1916: }
1917: alarm(0);
1918: }
1919: rename($transname,$fname);
1920: }
1921: }
1922: &Reply( $client, "ok\n", $userinput);
1923: } else {
1924: &Failure($client, "not_found\n", $userinput);
1925: }
1926: } else {
1927: &Failure($client, "rejected\n", $userinput);
1928: }
1929: return 1;
1930: }
1931: ®ister_handler("update", \&update_resource_handler, 0 ,1, 0);
1932:
1933: #
1.226 foxr 1934: # Fetch a user file from a remote server to the user's home directory
1935: # userfiles subdir.
1.225 foxr 1936: # Parameters:
1937: # $cmd - The command that got us here.
1938: # $tail - Tail of the command (remaining parameters).
1939: # $client - File descriptor connected to client.
1940: # Returns
1941: # 0 - Requested to exit, caller should shut down.
1942: # 1 - Continue processing.
1943: #
1944: sub fetch_user_file_handler {
1945:
1946: my ($cmd, $tail, $client) = @_;
1947:
1948: my $userinput = "$cmd:$tail";
1949: my $fname = $tail;
1.232 foxr 1950: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
1.225 foxr 1951: my $udir=&propath($udom,$uname).'/userfiles';
1952: unless (-e $udir) {
1953: mkdir($udir,0770);
1954: }
1.232 foxr 1955: Debug("fetch user file for $fname");
1.225 foxr 1956: if (-e $udir) {
1957: $ufile=~s/^[\.\~]+//;
1.232 foxr 1958:
1959: # IF necessary, create the path right down to the file.
1960: # Note that any regular files in the way of this path are
1961: # wiped out to deal with some earlier folly of mine.
1962:
1.264 albertel 1963: if (!&mkpath($udir.'/')) {
1964: &Failure($client, "unable_to_create\n", $userinput);
1.232 foxr 1965: }
1966:
1.225 foxr 1967: my $destname=$udir.'/'.$ufile;
1968: my $transname=$udir.'/'.$ufile.'.in.transit';
1969: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
1970: my $response;
1.232 foxr 1971: Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
1.225 foxr 1972: alarm(120);
1973: {
1974: my $ua=new LWP::UserAgent;
1975: my $request=new HTTP::Request('GET',"$remoteurl");
1976: $response=$ua->request($request,$transname);
1977: }
1978: alarm(0);
1979: if ($response->is_error()) {
1980: unlink($transname);
1981: my $message=$response->status_line;
1982: &logthis("LWP GET: $message for $fname ($remoteurl)");
1983: &Failure($client, "failed\n", $userinput);
1984: } else {
1.232 foxr 1985: Debug("Renaming $transname to $destname");
1.225 foxr 1986: if (!rename($transname,$destname)) {
1987: &logthis("Unable to move $transname to $destname");
1988: unlink($transname);
1989: &Failure($client, "failed\n", $userinput);
1990: } else {
1991: &Reply($client, "ok\n", $userinput);
1992: }
1993: }
1994: } else {
1995: &Failure($client, "not_home\n", $userinput);
1996: }
1997: return 1;
1998: }
1999: ®ister_handler("fetchuserfile", \&fetch_user_file_handler, 0, 1, 0);
2000:
1.226 foxr 2001: #
2002: # Remove a file from a user's home directory userfiles subdirectory.
2003: # Parameters:
2004: # cmd - the Lond request keyword that got us here.
2005: # tail - the part of the command past the keyword.
2006: # client- File descriptor connected with the client.
2007: #
2008: # Returns:
2009: # 1 - Continue processing.
2010: sub remove_user_file_handler {
2011: my ($cmd, $tail, $client) = @_;
2012:
2013: my ($fname) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2014:
2015: my ($udom,$uname,$ufile) = ($fname =~ m|^([^/]+)/([^/]+)/(.+)$|);
2016: if ($ufile =~m|/\.\./|) {
2017: # any files paths with /../ in them refuse
2018: # to deal with
2019: &Failure($client, "refused\n", "$cmd:$tail");
2020: } else {
2021: my $udir = &propath($udom,$uname);
2022: if (-e $udir) {
2023: my $file=$udir.'/userfiles/'.$ufile;
2024: if (-e $file) {
1.253 foxr 2025: #
2026: # If the file is a regular file unlink is fine...
2027: # However it's possible the client wants a dir.
2028: # removed, in which case rmdir is more approprate:
2029: #
1.240 banghart 2030: if (-f $file){
1.241 albertel 2031: unlink($file);
2032: } elsif(-d $file) {
2033: rmdir($file);
1.240 banghart 2034: }
1.226 foxr 2035: if (-e $file) {
1.253 foxr 2036: # File is still there after we deleted it ?!?
2037:
1.226 foxr 2038: &Failure($client, "failed\n", "$cmd:$tail");
2039: } else {
2040: &Reply($client, "ok\n", "$cmd:$tail");
2041: }
2042: } else {
2043: &Failure($client, "not_found\n", "$cmd:$tail");
2044: }
2045: } else {
2046: &Failure($client, "not_home\n", "$cmd:$tail");
2047: }
2048: }
2049: return 1;
2050: }
2051: ®ister_handler("removeuserfile", \&remove_user_file_handler, 0,1,0);
2052:
1.236 albertel 2053: #
2054: # make a directory in a user's home directory userfiles subdirectory.
2055: # Parameters:
2056: # cmd - the Lond request keyword that got us here.
2057: # tail - the part of the command past the keyword.
2058: # client- File descriptor connected with the client.
2059: #
2060: # Returns:
2061: # 1 - Continue processing.
2062: sub mkdir_user_file_handler {
2063: my ($cmd, $tail, $client) = @_;
2064:
2065: my ($dir) = split(/:/, $tail); # Get rid of any tailing :'s lonc may have sent.
2066: $dir=&unescape($dir);
2067: my ($udom,$uname,$ufile) = ($dir =~ m|^([^/]+)/([^/]+)/(.+)$|);
2068: if ($ufile =~m|/\.\./|) {
2069: # any files paths with /../ in them refuse
2070: # to deal with
2071: &Failure($client, "refused\n", "$cmd:$tail");
2072: } else {
2073: my $udir = &propath($udom,$uname);
2074: if (-e $udir) {
1.264 albertel 2075: my $newdir=$udir.'/userfiles/'.$ufile.'/';
2076: if (!&mkpath($newdir)) {
2077: &Failure($client, "failed\n", "$cmd:$tail");
1.236 albertel 2078: }
1.264 albertel 2079: &Reply($client, "ok\n", "$cmd:$tail");
1.236 albertel 2080: } else {
2081: &Failure($client, "not_home\n", "$cmd:$tail");
2082: }
2083: }
2084: return 1;
2085: }
2086: ®ister_handler("mkdiruserfile", \&mkdir_user_file_handler, 0,1,0);
2087:
1.237 albertel 2088: #
2089: # rename a file in a user's home directory userfiles subdirectory.
2090: # Parameters:
2091: # cmd - the Lond request keyword that got us here.
2092: # tail - the part of the command past the keyword.
2093: # client- File descriptor connected with the client.
2094: #
2095: # Returns:
2096: # 1 - Continue processing.
2097: sub rename_user_file_handler {
2098: my ($cmd, $tail, $client) = @_;
2099:
2100: my ($udom,$uname,$old,$new) = split(/:/, $tail);
2101: $old=&unescape($old);
2102: $new=&unescape($new);
2103: if ($new =~m|/\.\./| || $old =~m|/\.\./|) {
2104: # any files paths with /../ in them refuse to deal with
2105: &Failure($client, "refused\n", "$cmd:$tail");
2106: } else {
2107: my $udir = &propath($udom,$uname);
2108: if (-e $udir) {
2109: my $oldfile=$udir.'/userfiles/'.$old;
2110: my $newfile=$udir.'/userfiles/'.$new;
2111: if (-e $newfile) {
2112: &Failure($client, "exists\n", "$cmd:$tail");
2113: } elsif (! -e $oldfile) {
2114: &Failure($client, "not_found\n", "$cmd:$tail");
2115: } else {
2116: if (!rename($oldfile,$newfile)) {
2117: &Failure($client, "failed\n", "$cmd:$tail");
2118: } else {
2119: &Reply($client, "ok\n", "$cmd:$tail");
2120: }
2121: }
2122: } else {
2123: &Failure($client, "not_home\n", "$cmd:$tail");
2124: }
2125: }
2126: return 1;
2127: }
2128: ®ister_handler("renameuserfile", \&rename_user_file_handler, 0,1,0);
2129:
1.227 foxr 2130: #
1.263 albertel 2131: # Authenticate access to a user file by checking that the token the user's
2132: # passed also exists in their session file
1.227 foxr 2133: #
2134: # Parameters:
2135: # cmd - The request keyword that dispatched to tus.
2136: # tail - The tail of the request (colon separated parameters).
2137: # client - Filehandle open on the client.
2138: # Return:
2139: # 1.
2140: sub token_auth_user_file_handler {
2141: my ($cmd, $tail, $client) = @_;
2142:
2143: my ($fname, $session) = split(/:/, $tail);
2144:
2145: chomp($session);
1.251 foxr 2146: my $reply="non_auth\n";
1.227 foxr 2147: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
2148: $session.'.id')) {
2149: while (my $line=<ENVIN>) {
1.251 foxr 2150: if ($line=~ m|userfile\.\Q$fname\E\=|) { $reply="ok\n"; }
1.227 foxr 2151: }
2152: close(ENVIN);
1.251 foxr 2153: &Reply($client, $reply, "$cmd:$tail");
1.227 foxr 2154: } else {
2155: &Failure($client, "invalid_token\n", "$cmd:$tail");
2156: }
2157: return 1;
2158:
2159: }
2160: ®ister_handler("tokenauthuserfile", \&token_auth_user_file_handler, 0,1,0);
1.229 foxr 2161:
2162: #
2163: # Unsubscribe from a resource.
2164: #
2165: # Parameters:
2166: # $cmd - The command that got us here.
2167: # $tail - Tail of the command (remaining parameters).
2168: # $client - File descriptor connected to client.
2169: # Returns
2170: # 0 - Requested to exit, caller should shut down.
2171: # 1 - Continue processing.
2172: #
2173: sub unsubscribe_handler {
2174: my ($cmd, $tail, $client) = @_;
2175:
2176: my $userinput= "$cmd:$tail";
2177:
2178: my ($fname) = split(/:/,$tail); # Split in case there's extrs.
2179:
2180: &Debug("Unsubscribing $fname");
2181: if (-e $fname) {
2182: &Debug("Exists");
2183: &Reply($client, &unsub($fname,$clientip), $userinput);
2184: } else {
2185: &Failure($client, "not_found\n", $userinput);
2186: }
2187: return 1;
2188: }
2189: ®ister_handler("unsub", \&unsubscribe_handler, 0, 1, 0);
1.263 albertel 2190:
1.230 foxr 2191: # Subscribe to a resource
2192: #
2193: # Parameters:
2194: # $cmd - The command that got us here.
2195: # $tail - Tail of the command (remaining parameters).
2196: # $client - File descriptor connected to client.
2197: # Returns
2198: # 0 - Requested to exit, caller should shut down.
2199: # 1 - Continue processing.
2200: #
2201: sub subscribe_handler {
2202: my ($cmd, $tail, $client)= @_;
2203:
2204: my $userinput = "$cmd:$tail";
2205:
2206: &Reply( $client, &subscribe($userinput,$clientip), $userinput);
2207:
2208: return 1;
2209: }
2210: ®ister_handler("sub", \&subscribe_handler, 0, 1, 0);
2211:
2212: #
2213: # Determine the version of a resource (?) Or is it return
2214: # the top version of the resource? Not yet clear from the
2215: # code in currentversion.
2216: #
2217: # Parameters:
2218: # $cmd - The command that got us here.
2219: # $tail - Tail of the command (remaining parameters).
2220: # $client - File descriptor connected to client.
2221: # Returns
2222: # 0 - Requested to exit, caller should shut down.
2223: # 1 - Continue processing.
2224: #
2225: sub current_version_handler {
2226: my ($cmd, $tail, $client) = @_;
2227:
2228: my $userinput= "$cmd:$tail";
2229:
2230: my $fname = $tail;
2231: &Reply( $client, ¤tversion($fname)."\n", $userinput);
2232: return 1;
2233:
2234: }
2235: ®ister_handler("currentversion", \¤t_version_handler, 0, 1, 0);
2236:
2237: # Make an entry in a user's activity log.
2238: #
2239: # Parameters:
2240: # $cmd - The command that got us here.
2241: # $tail - Tail of the command (remaining parameters).
2242: # $client - File descriptor connected to client.
2243: # Returns
2244: # 0 - Requested to exit, caller should shut down.
2245: # 1 - Continue processing.
2246: #
2247: sub activity_log_handler {
2248: my ($cmd, $tail, $client) = @_;
2249:
2250:
2251: my $userinput= "$cmd:$tail";
2252:
2253: my ($udom,$uname,$what)=split(/:/,$tail);
2254: chomp($what);
2255: my $proname=&propath($udom,$uname);
2256: my $now=time;
2257: my $hfh;
2258: if ($hfh=IO::File->new(">>$proname/activity.log")) {
2259: print $hfh "$now:$clientname:$what\n";
2260: &Reply( $client, "ok\n", $userinput);
2261: } else {
2262: &Failure($client, "error: ".($!+0)." IO::File->new Failed "
2263: ."while attempting log\n",
2264: $userinput);
2265: }
2266:
2267: return 1;
2268: }
1.263 albertel 2269: ®ister_handler("log", \&activity_log_handler, 0, 1, 0);
1.230 foxr 2270:
2271: #
2272: # Put a namespace entry in a user profile hash.
2273: # My druthers would be for this to be an encrypted interaction too.
2274: # anything that might be an inadvertent covert channel about either
2275: # user authentication or user personal information....
2276: #
2277: # Parameters:
2278: # $cmd - The command that got us here.
2279: # $tail - Tail of the command (remaining parameters).
2280: # $client - File descriptor connected to client.
2281: # Returns
2282: # 0 - Requested to exit, caller should shut down.
2283: # 1 - Continue processing.
2284: #
2285: sub put_user_profile_entry {
2286: my ($cmd, $tail, $client) = @_;
1.229 foxr 2287:
1.230 foxr 2288: my $userinput = "$cmd:$tail";
2289:
1.242 raeburn 2290: my ($udom,$uname,$namespace,$what) =split(/:/,$tail,4);
1.230 foxr 2291: if ($namespace ne 'roles') {
2292: chomp($what);
2293: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2294: &GDBM_WRCREAT(),"P",$what);
2295: if($hashref) {
2296: my @pairs=split(/\&/,$what);
2297: foreach my $pair (@pairs) {
2298: my ($key,$value)=split(/=/,$pair);
2299: $hashref->{$key}=$value;
2300: }
2301: if (untie(%$hashref)) {
2302: &Reply( $client, "ok\n", $userinput);
2303: } else {
2304: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2305: "while attempting put\n",
2306: $userinput);
2307: }
2308: } else {
2309: &Failure( $client, "error: ".($!)." tie(GDBM) Failed ".
2310: "while attempting put\n", $userinput);
2311: }
2312: } else {
2313: &Failure( $client, "refused\n", $userinput);
2314: }
2315:
2316: return 1;
2317: }
2318: ®ister_handler("put", \&put_user_profile_entry, 0, 1, 0);
2319:
2320: #
2321: # Increment a profile entry in the user history file.
2322: # The history contains keyword value pairs. In this case,
2323: # The value itself is a pair of numbers. The first, the current value
2324: # the second an increment that this function applies to the current
2325: # value.
2326: #
2327: # Parameters:
2328: # $cmd - The command that got us here.
2329: # $tail - Tail of the command (remaining parameters).
2330: # $client - File descriptor connected to client.
2331: # Returns
2332: # 0 - Requested to exit, caller should shut down.
2333: # 1 - Continue processing.
2334: #
2335: sub increment_user_value_handler {
2336: my ($cmd, $tail, $client) = @_;
2337:
2338: my $userinput = "$cmd:$tail";
2339:
2340: my ($udom,$uname,$namespace,$what) =split(/:/,$tail);
2341: if ($namespace ne 'roles') {
2342: chomp($what);
2343: my $hashref = &tie_user_hash($udom, $uname,
2344: $namespace, &GDBM_WRCREAT(),
2345: "P",$what);
2346: if ($hashref) {
2347: my @pairs=split(/\&/,$what);
2348: foreach my $pair (@pairs) {
2349: my ($key,$value)=split(/=/,$pair);
2350: # We could check that we have a number...
2351: if (! defined($value) || $value eq '') {
2352: $value = 1;
2353: }
2354: $hashref->{$key}+=$value;
2355: }
2356: if (untie(%$hashref)) {
2357: &Reply( $client, "ok\n", $userinput);
2358: } else {
2359: &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
2360: "while attempting inc\n", $userinput);
2361: }
2362: } else {
2363: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2364: "while attempting inc\n", $userinput);
2365: }
2366: } else {
2367: &Failure($client, "refused\n", $userinput);
2368: }
2369:
2370: return 1;
2371: }
2372: ®ister_handler("inc", \&increment_user_value_handler, 0, 1, 0);
2373:
2374: #
2375: # Put a new role for a user. Roles are LonCAPA's packaging of permissions.
2376: # Each 'role' a user has implies a set of permissions. Adding a new role
2377: # for a person grants the permissions packaged with that role
2378: # to that user when the role is selected.
2379: #
2380: # Parameters:
2381: # $cmd - The command string (rolesput).
2382: # $tail - The remainder of the request line. For rolesput this
2383: # consists of a colon separated list that contains:
2384: # The domain and user that is granting the role (logged).
2385: # The domain and user that is getting the role.
2386: # The roles being granted as a set of & separated pairs.
2387: # each pair a key value pair.
2388: # $client - File descriptor connected to the client.
2389: # Returns:
2390: # 0 - If the daemon should exit
2391: # 1 - To continue processing.
2392: #
2393: #
2394: sub roles_put_handler {
2395: my ($cmd, $tail, $client) = @_;
2396:
2397: my $userinput = "$cmd:$tail";
2398:
2399: my ( $exedom, $exeuser, $udom, $uname, $what) = split(/:/,$tail);
2400:
2401:
2402: my $namespace='roles';
2403: chomp($what);
2404: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2405: &GDBM_WRCREAT(), "P",
2406: "$exedom:$exeuser:$what");
2407: #
2408: # Log the attempt to set a role. The {}'s here ensure that the file
2409: # handle is open for the minimal amount of time. Since the flush
2410: # is done on close this improves the chances the log will be an un-
2411: # corrupted ordered thing.
2412: if ($hashref) {
1.261 foxr 2413: my $pass_entry = &get_auth_type($udom, $uname);
2414: my ($auth_type,$pwd) = split(/:/, $pass_entry);
2415: $auth_type = $auth_type.":";
1.230 foxr 2416: my @pairs=split(/\&/,$what);
2417: foreach my $pair (@pairs) {
2418: my ($key,$value)=split(/=/,$pair);
2419: &manage_permissions($key, $udom, $uname,
1.260 foxr 2420: $auth_type);
1.230 foxr 2421: $hashref->{$key}=$value;
2422: }
2423: if (untie($hashref)) {
2424: &Reply($client, "ok\n", $userinput);
2425: } else {
2426: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2427: "while attempting rolesput\n", $userinput);
2428: }
2429: } else {
2430: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2431: "while attempting rolesput\n", $userinput);
2432: }
2433: return 1;
2434: }
2435: ®ister_handler("rolesput", \&roles_put_handler, 1,1,0); # Encoded client only.
2436:
2437: #
1.231 foxr 2438: # Deletes (removes) a role for a user. This is equivalent to removing
2439: # a permissions package associated with the role from the user's profile.
2440: #
2441: # Parameters:
2442: # $cmd - The command (rolesdel)
2443: # $tail - The remainder of the request line. This consists
2444: # of:
2445: # The domain and user requesting the change (logged)
2446: # The domain and user being changed.
2447: # The roles being revoked. These are shipped to us
2448: # as a bunch of & separated role name keywords.
2449: # $client - The file handle open on the client.
2450: # Returns:
2451: # 1 - Continue processing
2452: # 0 - Exit.
2453: #
2454: sub roles_delete_handler {
2455: my ($cmd, $tail, $client) = @_;
2456:
2457: my $userinput = "$cmd:$tail";
2458:
2459: my ($exedom,$exeuser,$udom,$uname,$what)=split(/:/,$tail);
2460: &Debug("cmd = ".$cmd." exedom= ".$exedom."user = ".$exeuser." udom=".$udom.
2461: "what = ".$what);
2462: my $namespace='roles';
2463: chomp($what);
2464: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2465: &GDBM_WRCREAT(), "D",
2466: "$exedom:$exeuser:$what");
2467:
2468: if ($hashref) {
2469: my @rolekeys=split(/\&/,$what);
2470:
2471: foreach my $key (@rolekeys) {
2472: delete $hashref->{$key};
2473: }
2474: if (untie(%$hashref)) {
2475: &Reply($client, "ok\n", $userinput);
2476: } else {
2477: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2478: "while attempting rolesdel\n", $userinput);
2479: }
2480: } else {
2481: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2482: "while attempting rolesdel\n", $userinput);
2483: }
2484:
2485: return 1;
2486: }
2487: ®ister_handler("rolesdel", \&roles_delete_handler, 1,1, 0); # Encoded client only
2488:
2489: # Unencrypted get from a user's profile database. See
2490: # GetProfileEntryEncrypted for a version that does end-to-end encryption.
2491: # This function retrieves a keyed item from a specific named database in the
2492: # user's directory.
2493: #
2494: # Parameters:
2495: # $cmd - Command request keyword (get).
2496: # $tail - Tail of the command. This is a colon separated list
2497: # consisting of the domain and username that uniquely
2498: # identifies the profile,
2499: # The 'namespace' which selects the gdbm file to
2500: # do the lookup in,
2501: # & separated list of keys to lookup. Note that
2502: # the values are returned as an & separated list too.
2503: # $client - File descriptor open on the client.
2504: # Returns:
2505: # 1 - Continue processing.
2506: # 0 - Exit.
2507: #
2508: sub get_profile_entry {
2509: my ($cmd, $tail, $client) = @_;
2510:
2511: my $userinput= "$cmd:$tail";
2512:
2513: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2514: chomp($what);
1.255 foxr 2515:
2516: my $replystring = read_profile($udom, $uname, $namespace, $what);
2517: my ($first) = split(/:/,$replystring);
2518: if($first ne "error") {
2519: &Reply($client, "$replystring\n", $userinput);
1.231 foxr 2520: } else {
1.255 foxr 2521: &Failure($client, $replystring." while attempting get\n", $userinput);
1.231 foxr 2522: }
2523: return 1;
1.255 foxr 2524:
2525:
1.231 foxr 2526: }
2527: ®ister_handler("get", \&get_profile_entry, 0,1,0);
2528:
2529: #
2530: # Process the encrypted get request. Note that the request is sent
2531: # in clear, but the reply is encrypted. This is a small covert channel:
2532: # information about the sensitive keys is given to the snooper. Just not
2533: # information about the values of the sensitive key. Hmm if I wanted to
2534: # know these I'd snoop for the egets. Get the profile item names from them
2535: # and then issue a get for them since there's no enforcement of the
2536: # requirement of an encrypted get for particular profile items. If I
2537: # were re-doing this, I'd force the request to be encrypted as well as the
2538: # reply. I'd also just enforce encrypted transactions for all gets since
2539: # that would prevent any covert channel snooping.
2540: #
2541: # Parameters:
2542: # $cmd - Command keyword of request (eget).
2543: # $tail - Tail of the command. See GetProfileEntry
# for more information about this.
2544: # $client - File open on the client.
2545: # Returns:
2546: # 1 - Continue processing
2547: # 0 - server should exit.
2548: sub get_profile_entry_encrypted {
2549: my ($cmd, $tail, $client) = @_;
2550:
2551: my $userinput = "$cmd:$tail";
2552:
2553: my ($cmd,$udom,$uname,$namespace,$what) = split(/:/,$userinput);
2554: chomp($what);
1.255 foxr 2555: my $qresult = read_profile($udom, $uname, $namespace, $what);
2556: my ($first) = split(/:/, $qresult);
2557: if($first ne "error") {
2558:
2559: if ($cipher) {
2560: my $cmdlength=length($qresult);
2561: $qresult.=" ";
2562: my $encqresult='';
2563: for(my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
2564: $encqresult.= unpack("H16",
2565: $cipher->encrypt(substr($qresult,
2566: $encidx,
2567: 8)));
2568: }
2569: &Reply( $client, "enc:$cmdlength:$encqresult\n", $userinput);
2570: } else {
1.231 foxr 2571: &Failure( $client, "error:no_key\n", $userinput);
2572: }
2573: } else {
1.255 foxr 2574: &Failure($client, "$qresult while attempting eget\n", $userinput);
2575:
1.231 foxr 2576: }
2577:
2578: return 1;
2579: }
1.255 foxr 2580: ®ister_handler("eget", \&get_profile_entry_encrypted, 0, 1, 0);
1.263 albertel 2581:
1.231 foxr 2582: #
2583: # Deletes a key in a user profile database.
2584: #
2585: # Parameters:
2586: # $cmd - Command keyword (del).
2587: # $tail - Command tail. IN this case a colon
2588: # separated list containing:
2589: # The domain and user that identifies uniquely
2590: # the identity of the user.
2591: # The profile namespace (name of the profile
2592: # database file).
2593: # & separated list of keywords to delete.
2594: # $client - File open on client socket.
2595: # Returns:
2596: # 1 - Continue processing
2597: # 0 - Exit server.
2598: #
2599: #
2600: sub delete_profile_entry {
2601: my ($cmd, $tail, $client) = @_;
2602:
2603: my $userinput = "cmd:$tail";
2604:
2605: my ($udom,$uname,$namespace,$what) = split(/:/,$tail);
2606: chomp($what);
2607: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2608: &GDBM_WRCREAT(),
2609: "D",$what);
2610: if ($hashref) {
2611: my @keys=split(/\&/,$what);
2612: foreach my $key (@keys) {
2613: delete($hashref->{$key});
2614: }
2615: if (untie(%$hashref)) {
2616: &Reply($client, "ok\n", $userinput);
2617: } else {
2618: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2619: "while attempting del\n", $userinput);
2620: }
2621: } else {
2622: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2623: "while attempting del\n", $userinput);
2624: }
2625: return 1;
2626: }
2627: ®ister_handler("del", \&delete_profile_entry, 0, 1, 0);
1.263 albertel 2628:
1.231 foxr 2629: #
2630: # List the set of keys that are defined in a profile database file.
2631: # A successful reply from this will contain an & separated list of
2632: # the keys.
2633: # Parameters:
2634: # $cmd - Command request (keys).
2635: # $tail - Remainder of the request, a colon separated
2636: # list containing domain/user that identifies the
2637: # user being queried, and the database namespace
2638: # (database filename essentially).
2639: # $client - File open on the client.
2640: # Returns:
2641: # 1 - Continue processing.
2642: # 0 - Exit the server.
2643: #
2644: sub get_profile_keys {
2645: my ($cmd, $tail, $client) = @_;
2646:
2647: my $userinput = "$cmd:$tail";
2648:
2649: my ($udom,$uname,$namespace)=split(/:/,$tail);
2650: my $qresult='';
2651: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2652: &GDBM_READER());
2653: if ($hashref) {
2654: foreach my $key (keys %$hashref) {
2655: $qresult.="$key&";
2656: }
2657: if (untie(%$hashref)) {
2658: $qresult=~s/\&$//;
2659: &Reply($client, "$qresult\n", $userinput);
2660: } else {
2661: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2662: "while attempting keys\n", $userinput);
2663: }
2664: } else {
2665: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2666: "while attempting keys\n", $userinput);
2667: }
2668:
2669: return 1;
2670: }
2671: ®ister_handler("keys", \&get_profile_keys, 0, 1, 0);
2672:
2673: #
2674: # Dump the contents of a user profile database.
2675: # Note that this constitutes a very large covert channel too since
2676: # the dump will return sensitive information that is not encrypted.
2677: # The naive security assumption is that the session negotiation ensures
2678: # our client is trusted and I don't believe that's assured at present.
2679: # Sure want badly to go to ssl or tls. Of course if my peer isn't really
2680: # a LonCAPA node they could have negotiated an encryption key too so >sigh<.
2681: #
2682: # Parameters:
2683: # $cmd - The command request keyword (currentdump).
2684: # $tail - Remainder of the request, consisting of a colon
2685: # separated list that has the domain/username and
2686: # the namespace to dump (database file).
2687: # $client - file open on the remote client.
2688: # Returns:
2689: # 1 - Continue processing.
2690: # 0 - Exit the server.
2691: #
2692: sub dump_profile_database {
2693: my ($cmd, $tail, $client) = @_;
2694:
2695: my $userinput = "$cmd:$tail";
2696:
2697: my ($udom,$uname,$namespace) = split(/:/,$tail);
2698: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2699: &GDBM_READER());
2700: if ($hashref) {
2701: # Structure of %data:
2702: # $data{$symb}->{$parameter}=$value;
2703: # $data{$symb}->{'v.'.$parameter}=$version;
2704: # since $parameter will be unescaped, we do not
2705: # have to worry about silly parameter names...
2706:
2707: my $qresult='';
2708: my %data = (); # A hash of anonymous hashes..
2709: while (my ($key,$value) = each(%$hashref)) {
2710: my ($v,$symb,$param) = split(/:/,$key);
2711: next if ($v eq 'version' || $symb eq 'keys');
2712: next if (exists($data{$symb}) &&
2713: exists($data{$symb}->{$param}) &&
2714: $data{$symb}->{'v.'.$param} > $v);
2715: $data{$symb}->{$param}=$value;
2716: $data{$symb}->{'v.'.$param}=$v;
2717: }
2718: if (untie(%$hashref)) {
2719: while (my ($symb,$param_hash) = each(%data)) {
2720: while(my ($param,$value) = each (%$param_hash)){
2721: next if ($param =~ /^v\./); # Ignore versions...
2722: #
2723: # Just dump the symb=value pairs separated by &
2724: #
2725: $qresult.=$symb.':'.$param.'='.$value.'&';
2726: }
2727: }
2728: chop($qresult);
2729: &Reply($client , "$qresult\n", $userinput);
2730: } else {
2731: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2732: "while attempting currentdump\n", $userinput);
2733: }
2734: } else {
2735: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2736: "while attempting currentdump\n", $userinput);
2737: }
2738:
2739: return 1;
2740: }
2741: ®ister_handler("currentdump", \&dump_profile_database, 0, 1, 0);
2742:
2743: #
2744: # Dump a profile database with an optional regular expression
2745: # to match against the keys. In this dump, no effort is made
2746: # to separate symb from version information. Presumably the
2747: # databases that are dumped by this command are of a different
2748: # structure. Need to look at this and improve the documentation of
2749: # both this and the currentdump handler.
2750: # Parameters:
2751: # $cmd - The command keyword.
2752: # $tail - All of the characters after the $cmd:
2753: # These are expected to be a colon
2754: # separated list containing:
2755: # domain/user - identifying the user.
2756: # namespace - identifying the database.
2757: # regexp - optional regular expression
2758: # that is matched against
2759: # database keywords to do
2760: # selective dumps.
2761: # $client - Channel open on the client.
2762: # Returns:
2763: # 1 - Continue processing.
2764: # Side effects:
2765: # response is written to $client.
2766: #
2767: sub dump_with_regexp {
2768: my ($cmd, $tail, $client) = @_;
2769:
2770:
2771: my $userinput = "$cmd:$tail";
2772:
2773: my ($udom,$uname,$namespace,$regexp)=split(/:/,$tail);
2774: if (defined($regexp)) {
2775: $regexp=&unescape($regexp);
2776: } else {
2777: $regexp='.';
2778: }
2779: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2780: &GDBM_READER());
2781: if ($hashref) {
2782: my $qresult='';
2783: while (my ($key,$value) = each(%$hashref)) {
2784: if ($regexp eq '.') {
2785: $qresult.=$key.'='.$value.'&';
2786: } else {
2787: my $unescapeKey = &unescape($key);
2788: if (eval('$unescapeKey=~/$regexp/')) {
2789: $qresult.="$key=$value&";
2790: }
2791: }
2792: }
2793: if (untie(%$hashref)) {
2794: chop($qresult);
2795: &Reply($client, "$qresult\n", $userinput);
2796: } else {
2797: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
2798: "while attempting dump\n", $userinput);
2799: }
2800: } else {
2801: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2802: "while attempting dump\n", $userinput);
2803: }
2804:
2805: return 1;
2806: }
2807: ®ister_handler("dump", \&dump_with_regexp, 0, 1, 0);
2808:
2809: # Store a set of key=value pairs associated with a versioned name.
2810: #
2811: # Parameters:
2812: # $cmd - Request command keyword.
2813: # $tail - Tail of the request. This is a colon
2814: # separated list containing:
2815: # domain/user - User and authentication domain.
2816: # namespace - Name of the database being modified
2817: # rid - Resource keyword to modify.
2818: # what - new value associated with rid.
2819: #
2820: # $client - Socket open on the client.
2821: #
2822: #
2823: # Returns:
2824: # 1 (keep on processing).
2825: # Side-Effects:
2826: # Writes to the client
2827: sub store_handler {
2828: my ($cmd, $tail, $client) = @_;
2829:
2830: my $userinput = "$cmd:$tail";
2831:
2832: my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
2833: if ($namespace ne 'roles') {
2834:
2835: chomp($what);
2836: my @pairs=split(/\&/,$what);
2837: my $hashref = &tie_user_hash($udom, $uname, $namespace,
2838: &GDBM_WRCREAT(), "P",
2839: "$rid:$what");
2840: if ($hashref) {
2841: my $now = time;
2842: my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
2843: my $key;
2844: $hashref->{"version:$rid"}++;
2845: my $version=$hashref->{"version:$rid"};
2846: my $allkeys='';
2847: foreach my $pair (@pairs) {
2848: my ($key,$value)=split(/=/,$pair);
2849: $allkeys.=$key.':';
2850: $hashref->{"$version:$rid:$key"}=$value;
2851: }
2852: $hashref->{"$version:$rid:timestamp"}=$now;
2853: $allkeys.='timestamp';
2854: $hashref->{"$version:keys:$rid"}=$allkeys;
2855: if (untie($hashref)) {
2856: &Reply($client, "ok\n", $userinput);
2857: } else {
2858: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2859: "while attempting store\n", $userinput);
2860: }
2861: } else {
2862: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
2863: "while attempting store\n", $userinput);
2864: }
2865: } else {
2866: &Failure($client, "refused\n", $userinput);
2867: }
2868:
2869: return 1;
2870: }
2871: ®ister_handler("store", \&store_handler, 0, 1, 0);
1.263 albertel 2872:
1.231 foxr 2873: #
2874: # Dump out all versions of a resource that has key=value pairs associated
2875: # with it for each version. These resources are built up via the store
2876: # command.
2877: #
2878: # Parameters:
2879: # $cmd - Command keyword.
2880: # $tail - Remainder of the request which consists of:
2881: # domain/user - User and auth. domain.
2882: # namespace - name of resource database.
2883: # rid - Resource id.
2884: # $client - socket open on the client.
2885: #
2886: # Returns:
2887: # 1 indicating the caller should not yet exit.
2888: # Side-effects:
2889: # Writes a reply to the client.
2890: # The reply is a string of the following shape:
2891: # version=current&version:keys=k1:k2...&1:k1=v1&1:k2=v2...
2892: # Where the 1 above represents version 1.
2893: # this continues for all pairs of keys in all versions.
2894: #
2895: #
2896: #
2897: #
2898: sub restore_handler {
2899: my ($cmd, $tail, $client) = @_;
2900:
2901: my $userinput = "$cmd:$tail"; # Only used for logging purposes.
2902:
2903: my ($cmd,$udom,$uname,$namespace,$rid) = split(/:/,$userinput);
2904: $namespace=~s/\//\_/g;
2905: $namespace=~s/\W//g;
2906: chomp($rid);
2907: my $proname=&propath($udom,$uname);
2908: my $qresult='';
2909: my %hash;
2910: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",
2911: &GDBM_READER(),0640)) {
2912: my $version=$hash{"version:$rid"};
2913: $qresult.="version=$version&";
2914: my $scope;
2915: for ($scope=1;$scope<=$version;$scope++) {
2916: my $vkeys=$hash{"$scope:keys:$rid"};
2917: my @keys=split(/:/,$vkeys);
2918: my $key;
2919: $qresult.="$scope:keys=$vkeys&";
2920: foreach $key (@keys) {
2921: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
2922: }
2923: }
2924: if (untie(%hash)) {
2925: $qresult=~s/\&$//;
2926: &Reply( $client, "$qresult\n", $userinput);
2927: } else {
2928: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
2929: "while attempting restore\n", $userinput);
2930: }
2931: } else {
2932: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
2933: "while attempting restore\n", $userinput);
2934: }
2935:
2936: return 1;
2937:
2938:
2939: }
2940: ®ister_handler("restore", \&restore_handler, 0,1,0);
1.234 foxr 2941:
2942: #
2943: # Add a chat message to to a discussion board.
2944: #
2945: # Parameters:
2946: # $cmd - Request keyword.
2947: # $tail - Tail of the command. A colon separated list
2948: # containing:
2949: # cdom - Domain on which the chat board lives
2950: # cnum - Identifier of the discussion group.
2951: # post - Body of the posting.
2952: # $client - Socket open on the client.
2953: # Returns:
2954: # 1 - Indicating caller should keep on processing.
2955: #
2956: # Side-effects:
2957: # writes a reply to the client.
2958: #
2959: #
2960: sub send_chat_handler {
2961: my ($cmd, $tail, $client) = @_;
2962:
2963:
2964: my $userinput = "$cmd:$tail";
2965:
2966: my ($cdom,$cnum,$newpost)=split(/\:/,$tail);
2967: &chat_add($cdom,$cnum,$newpost);
2968: &Reply($client, "ok\n", $userinput);
2969:
2970: return 1;
2971: }
2972: ®ister_handler("chatsend", \&send_chat_handler, 0, 1, 0);
1.263 albertel 2973:
1.234 foxr 2974: #
2975: # Retrieve the set of chat messagss from a discussion board.
2976: #
2977: # Parameters:
2978: # $cmd - Command keyword that initiated the request.
2979: # $tail - Remainder of the request after the command
2980: # keyword. In this case a colon separated list of
2981: # chat domain - Which discussion board.
2982: # chat id - Discussion thread(?)
2983: # domain/user - Authentication domain and username
2984: # of the requesting person.
2985: # $client - Socket open on the client program.
2986: # Returns:
2987: # 1 - continue processing
2988: # Side effects:
2989: # Response is written to the client.
2990: #
2991: sub retrieve_chat_handler {
2992: my ($cmd, $tail, $client) = @_;
2993:
2994:
2995: my $userinput = "$cmd:$tail";
2996:
2997: my ($cdom,$cnum,$udom,$uname)=split(/\:/,$tail);
2998: my $reply='';
2999: foreach (&get_chat($cdom,$cnum,$udom,$uname)) {
3000: $reply.=&escape($_).':';
3001: }
3002: $reply=~s/\:$//;
3003: &Reply($client, $reply."\n", $userinput);
3004:
3005:
3006: return 1;
3007: }
3008: ®ister_handler("chatretr", \&retrieve_chat_handler, 0, 1, 0);
3009:
3010: #
3011: # Initiate a query of an sql database. SQL query repsonses get put in
3012: # a file for later retrieval. This prevents sql query results from
3013: # bottlenecking the system. Note that with loncnew, perhaps this is
3014: # less of an issue since multiple outstanding requests can be concurrently
3015: # serviced.
3016: #
3017: # Parameters:
3018: # $cmd - COmmand keyword that initiated the request.
3019: # $tail - Remainder of the command after the keyword.
3020: # For this function, this consists of a query and
3021: # 3 arguments that are self-documentingly labelled
3022: # in the original arg1, arg2, arg3.
3023: # $client - Socket open on the client.
3024: # Return:
3025: # 1 - Indicating processing should continue.
3026: # Side-effects:
3027: # a reply is written to $client.
3028: #
3029: sub send_query_handler {
3030: my ($cmd, $tail, $client) = @_;
3031:
3032:
3033: my $userinput = "$cmd:$tail";
3034:
3035: my ($query,$arg1,$arg2,$arg3)=split(/\:/,$tail);
3036: $query=~s/\n*$//g;
3037: &Reply($client, "". &sql_reply("$clientname\&$query".
3038: "\&$arg1"."\&$arg2"."\&$arg3")."\n",
3039: $userinput);
3040:
3041: return 1;
3042: }
3043: ®ister_handler("querysend", \&send_query_handler, 0, 1, 0);
3044:
3045: #
3046: # Add a reply to an sql query. SQL queries are done asyncrhonously.
3047: # The query is submitted via a "querysend" transaction.
3048: # There it is passed on to the lonsql daemon, queued and issued to
3049: # mysql.
3050: # This transaction is invoked when the sql transaction is complete
3051: # it stores the query results in flie and indicates query completion.
3052: # presumably local software then fetches this response... I'm guessing
3053: # the sequence is: lonc does a querysend, we ask lonsql to do it.
3054: # lonsql on completion of the query interacts with the lond of our
3055: # client to do a query reply storing two files:
3056: # - id - The results of the query.
3057: # - id.end - Indicating the transaction completed.
3058: # NOTE: id is a unique id assigned to the query and querysend time.
3059: # Parameters:
3060: # $cmd - Command keyword that initiated this request.
3061: # $tail - Remainder of the tail. In this case that's a colon
3062: # separated list containing the query Id and the
3063: # results of the query.
3064: # $client - Socket open on the client.
3065: # Return:
3066: # 1 - Indicating that we should continue processing.
3067: # Side effects:
3068: # ok written to the client.
3069: #
3070: sub reply_query_handler {
3071: my ($cmd, $tail, $client) = @_;
3072:
3073:
3074: my $userinput = "$cmd:$tail";
3075:
3076: my ($cmd,$id,$reply)=split(/:/,$userinput);
3077: my $store;
3078: my $execdir=$perlvar{'lonDaemons'};
3079: if ($store=IO::File->new(">$execdir/tmp/$id")) {
3080: $reply=~s/\&/\n/g;
3081: print $store $reply;
3082: close $store;
3083: my $store2=IO::File->new(">$execdir/tmp/$id.end");
3084: print $store2 "done\n";
3085: close $store2;
3086: &Reply($client, "ok\n", $userinput);
3087: } else {
3088: &Failure($client, "error: ".($!+0)
3089: ." IO::File->new Failed ".
3090: "while attempting queryreply\n", $userinput);
3091: }
3092:
3093:
3094: return 1;
3095: }
3096: ®ister_handler("queryreply", \&reply_query_handler, 0, 1, 0);
3097:
3098: #
3099: # Process the courseidput request. Not quite sure what this means
3100: # at the system level sense. It appears a gdbm file in the
3101: # /home/httpd/lonUsers/$domain/nohist_courseids is tied and
3102: # a set of entries made in that database.
3103: #
3104: # Parameters:
3105: # $cmd - The command keyword that initiated this request.
3106: # $tail - Tail of the command. In this case consists of a colon
3107: # separated list contaning the domain to apply this to and
3108: # an ampersand separated list of keyword=value pairs.
3109: # $client - Socket open on the client.
3110: # Returns:
3111: # 1 - indicating that processing should continue
3112: #
3113: # Side effects:
3114: # reply is written to the client.
3115: #
3116: sub put_course_id_handler {
3117: my ($cmd, $tail, $client) = @_;
3118:
3119:
3120: my $userinput = "$cmd:$tail";
3121:
3122: my ($udom, $what) = split(/:/, $tail);
3123: chomp($what);
3124: my $now=time;
3125: my @pairs=split(/\&/,$what);
3126:
3127: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3128: if ($hashref) {
3129: foreach my $pair (@pairs) {
1.253 foxr 3130: my ($key,$descr,$inst_code)=split(/=/,$pair);
3131: $hashref->{$key}=$descr.':'.$inst_code.':'.$now;
1.234 foxr 3132: }
3133: if (untie(%$hashref)) {
1.253 foxr 3134: &Reply( $client, "ok\n", $userinput);
1.234 foxr 3135: } else {
1.253 foxr 3136: &Failure($client, "error: ".($!+0)
1.234 foxr 3137: ." untie(GDBM) Failed ".
3138: "while attempting courseidput\n", $userinput);
3139: }
3140: } else {
1.253 foxr 3141: &Failure($client, "error: ".($!+0)
1.234 foxr 3142: ." tie(GDBM) Failed ".
3143: "while attempting courseidput\n", $userinput);
3144: }
1.253 foxr 3145:
1.234 foxr 3146:
3147: return 1;
3148: }
3149: ®ister_handler("courseidput", \&put_course_id_handler, 0, 1, 0);
3150:
3151: # Retrieves the value of a course id resource keyword pattern
3152: # defined since a starting date. Both the starting date and the
3153: # keyword pattern are optional. If the starting date is not supplied it
3154: # is treated as the beginning of time. If the pattern is not found,
3155: # it is treatred as "." matching everything.
3156: #
3157: # Parameters:
3158: # $cmd - Command keyword that resulted in us being dispatched.
3159: # $tail - The remainder of the command that, in this case, consists
3160: # of a colon separated list of:
3161: # domain - The domain in which the course database is
3162: # defined.
3163: # since - Optional parameter describing the minimum
3164: # time of definition(?) of the resources that
3165: # will match the dump.
3166: # description - regular expression that is used to filter
3167: # the dump. Only keywords matching this regexp
3168: # will be used.
3169: # $client - The socket open on the client.
3170: # Returns:
3171: # 1 - Continue processing.
3172: # Side Effects:
3173: # a reply is written to $client.
3174: sub dump_course_id_handler {
3175: my ($cmd, $tail, $client) = @_;
3176:
3177: my $userinput = "$cmd:$tail";
3178:
3179: my ($udom,$since,$description) =split(/:/,$tail);
3180: if (defined($description)) {
3181: $description=&unescape($description);
3182: } else {
3183: $description='.';
3184: }
3185: unless (defined($since)) { $since=0; }
3186: my $qresult='';
3187: my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
3188: if ($hashref) {
3189: while (my ($key,$value) = each(%$hashref)) {
3190: my ($descr,$lasttime,$inst_code);
3191: if ($value =~ m/^([^\:]*):([^\:]*):(\d+)$/) {
3192: ($descr,$inst_code,$lasttime)=($1,$2,$3);
3193: } else {
3194: ($descr,$lasttime) = split(/\:/,$value);
3195: }
3196: if ($lasttime<$since) { next; }
3197: if ($description eq '.') {
3198: $qresult.=$key.'='.$descr.':'.$inst_code.'&';
3199: } else {
3200: my $unescapeVal = &unescape($descr);
3201: if (eval('$unescapeVal=~/\Q$description\E/i')) {
3202: $qresult.=$key.'='.$descr.':'.$inst_code.'&';
3203: }
3204: }
3205: }
3206: if (untie(%$hashref)) {
3207: chop($qresult);
3208: &Reply($client, "$qresult\n", $userinput);
3209: } else {
3210: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3211: "while attempting courseiddump\n", $userinput);
3212: }
3213: } else {
3214: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3215: "while attempting courseiddump\n", $userinput);
3216: }
3217:
3218:
3219: return 1;
3220: }
3221: ®ister_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
1.238 foxr 3222:
3223: #
3224: # Puts an id to a domains id database.
3225: #
3226: # Parameters:
3227: # $cmd - The command that triggered us.
3228: # $tail - Remainder of the request other than the command. This is a
3229: # colon separated list containing:
3230: # $domain - The domain for which we are writing the id.
3231: # $pairs - The id info to write... this is and & separated list
3232: # of keyword=value.
3233: # $client - Socket open on the client.
3234: # Returns:
3235: # 1 - Continue processing.
3236: # Side effects:
3237: # reply is written to $client.
3238: #
3239: sub put_id_handler {
3240: my ($cmd,$tail,$client) = @_;
3241:
3242:
3243: my $userinput = "$cmd:$tail";
3244:
3245: my ($udom,$what)=split(/:/,$tail);
3246: chomp($what);
3247: my @pairs=split(/\&/,$what);
3248: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
3249: "P", $what);
3250: if ($hashref) {
3251: foreach my $pair (@pairs) {
3252: my ($key,$value)=split(/=/,$pair);
3253: $hashref->{$key}=$value;
3254: }
3255: if (untie(%$hashref)) {
3256: &Reply($client, "ok\n", $userinput);
3257: } else {
3258: &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
3259: "while attempting idput\n", $userinput);
3260: }
3261: } else {
3262: &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
3263: "while attempting idput\n", $userinput);
3264: }
3265:
3266: return 1;
3267: }
1.263 albertel 3268: ®ister_handler("idput", \&put_id_handler, 0, 1, 0);
1.238 foxr 3269:
3270: #
3271: # Retrieves a set of id values from the id database.
3272: # Returns an & separated list of results, one for each requested id to the
3273: # client.
3274: #
3275: # Parameters:
3276: # $cmd - Command keyword that caused us to be dispatched.
3277: # $tail - Tail of the command. Consists of a colon separated:
3278: # domain - the domain whose id table we dump
3279: # ids Consists of an & separated list of
3280: # id keywords whose values will be fetched.
3281: # nonexisting keywords will have an empty value.
3282: # $client - Socket open on the client.
3283: #
3284: # Returns:
3285: # 1 - indicating processing should continue.
3286: # Side effects:
3287: # An & separated list of results is written to $client.
3288: #
3289: sub get_id_handler {
3290: my ($cmd, $tail, $client) = @_;
3291:
3292:
3293: my $userinput = "$client:$tail";
3294:
3295: my ($udom,$what)=split(/:/,$tail);
3296: chomp($what);
3297: my @queries=split(/\&/,$what);
3298: my $qresult='';
3299: my $hashref = &tie_domain_hash($udom, "ids", &GDBM_READER());
3300: if ($hashref) {
3301: for (my $i=0;$i<=$#queries;$i++) {
3302: $qresult.="$hashref->{$queries[$i]}&";
3303: }
3304: if (untie(%$hashref)) {
3305: $qresult=~s/\&$//;
3306: &Reply($client, "$qresult\n", $userinput);
3307: } else {
3308: &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
3309: "while attempting idget\n",$userinput);
3310: }
3311: } else {
3312: &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
3313: "while attempting idget\n",$userinput);
3314: }
3315:
3316: return 1;
3317: }
1.263 albertel 3318: ®ister_handler("idget", \&get_id_handler, 0, 1, 0);
1.238 foxr 3319:
3320: #
3321: # Process the tmpput command I'm not sure what this does.. Seems to
3322: # create a file in the lonDaemons/tmp directory of the form $id.tmp
3323: # where Id is the client's ip concatenated with a sequence number.
3324: # The file will contain some value that is passed in. Is this e.g.
3325: # a login token?
3326: #
3327: # Parameters:
3328: # $cmd - The command that got us dispatched.
3329: # $tail - The remainder of the request following $cmd:
3330: # In this case this will be the contents of the file.
3331: # $client - Socket connected to the client.
3332: # Returns:
3333: # 1 indicating processing can continue.
3334: # Side effects:
3335: # A file is created in the local filesystem.
3336: # A reply is sent to the client.
3337: sub tmp_put_handler {
3338: my ($cmd, $what, $client) = @_;
3339:
3340: my $userinput = "$cmd:$what"; # Reconstruct for logging.
3341:
3342:
3343: my $store;
3344: $tmpsnum++;
3345: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
3346: $id=~s/\W/\_/g;
3347: $what=~s/\n//g;
3348: my $execdir=$perlvar{'lonDaemons'};
3349: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
3350: print $store $what;
3351: close $store;
3352: &Reply($client, "$id\n", $userinput);
3353: } else {
3354: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3355: "while attempting tmpput\n", $userinput);
3356: }
3357: return 1;
3358:
3359: }
3360: ®ister_handler("tmpput", \&tmp_put_handler, 0, 1, 0);
1.263 albertel 3361:
1.238 foxr 3362: # Processes the tmpget command. This command returns the contents
3363: # of a temporary resource file(?) created via tmpput.
3364: #
3365: # Paramters:
3366: # $cmd - Command that got us dispatched.
3367: # $id - Tail of the command, contain the id of the resource
3368: # we want to fetch.
3369: # $client - socket open on the client.
3370: # Return:
3371: # 1 - Inidcating processing can continue.
3372: # Side effects:
3373: # A reply is sent to the client.
3374: #
3375: sub tmp_get_handler {
3376: my ($cmd, $id, $client) = @_;
3377:
3378: my $userinput = "$cmd:$id";
3379:
3380:
3381: $id=~s/\W/\_/g;
3382: my $store;
3383: my $execdir=$perlvar{'lonDaemons'};
3384: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
3385: my $reply=<$store>;
3386: &Reply( $client, "$reply\n", $userinput);
3387: close $store;
3388: } else {
3389: &Failure( $client, "error: ".($!+0)."IO::File->new Failed ".
3390: "while attempting tmpget\n", $userinput);
3391: }
3392:
3393: return 1;
3394: }
3395: ®ister_handler("tmpget", \&tmp_get_handler, 0, 1, 0);
1.263 albertel 3396:
1.238 foxr 3397: #
3398: # Process the tmpdel command. This command deletes a temp resource
3399: # created by the tmpput command.
3400: #
3401: # Parameters:
3402: # $cmd - Command that got us here.
3403: # $id - Id of the temporary resource created.
3404: # $client - socket open on the client process.
3405: #
3406: # Returns:
3407: # 1 - Indicating processing should continue.
3408: # Side Effects:
3409: # A file is deleted
3410: # A reply is sent to the client.
3411: sub tmp_del_handler {
3412: my ($cmd, $id, $client) = @_;
3413:
3414: my $userinput= "$cmd:$id";
3415:
3416: chomp($id);
3417: $id=~s/\W/\_/g;
3418: my $execdir=$perlvar{'lonDaemons'};
3419: if (unlink("$execdir/tmp/$id.tmp")) {
3420: &Reply($client, "ok\n", $userinput);
3421: } else {
3422: &Failure( $client, "error: ".($!+0)."Unlink tmp Failed ".
3423: "while attempting tmpdel\n", $userinput);
3424: }
3425:
3426: return 1;
3427:
3428: }
3429: ®ister_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
1.263 albertel 3430:
1.238 foxr 3431: #
1.246 foxr 3432: # Processes the setannounce command. This command
3433: # creates a file named announce.txt in the top directory of
3434: # the documentn root and sets its contents. The announce.txt file is
3435: # printed in its entirety at the LonCAPA login page. Note:
3436: # once the announcement.txt fileis created it cannot be deleted.
3437: # However, setting the contents of the file to empty removes the
3438: # announcement from the login page of loncapa so who cares.
3439: #
3440: # Parameters:
3441: # $cmd - The command that got us dispatched.
3442: # $announcement - The text of the announcement.
3443: # $client - Socket open on the client process.
3444: # Retunrns:
3445: # 1 - Indicating request processing should continue
3446: # Side Effects:
3447: # The file {DocRoot}/announcement.txt is created.
3448: # A reply is sent to $client.
3449: #
3450: sub set_announce_handler {
3451: my ($cmd, $announcement, $client) = @_;
3452:
3453: my $userinput = "$cmd:$announcement";
3454:
3455: chomp($announcement);
3456: $announcement=&unescape($announcement);
3457: if (my $store=IO::File->new('>'.$perlvar{'lonDocRoot'}.
3458: '/announcement.txt')) {
3459: print $store $announcement;
3460: close $store;
3461: &Reply($client, "ok\n", $userinput);
3462: } else {
3463: &Failure($client, "error: ".($!+0)."\n", $userinput);
3464: }
3465:
3466: return 1;
3467: }
3468: ®ister_handler("setannounce", \&set_announce_handler, 0, 1, 0);
1.263 albertel 3469:
1.246 foxr 3470: #
3471: # Return the version of the daemon. This can be used to determine
3472: # the compatibility of cross version installations or, alternatively to
3473: # simply know who's out of date and who isn't. Note that the version
3474: # is returned concatenated with the tail.
3475: # Parameters:
3476: # $cmd - the request that dispatched to us.
3477: # $tail - Tail of the request (client's version?).
3478: # $client - Socket open on the client.
3479: #Returns:
3480: # 1 - continue processing requests.
3481: # Side Effects:
3482: # Replies with version to $client.
3483: sub get_version_handler {
3484: my ($cmd, $tail, $client) = @_;
3485:
3486: my $userinput = $cmd.$tail;
3487:
3488: &Reply($client, &version($userinput)."\n", $userinput);
3489:
3490:
3491: return 1;
3492: }
3493: ®ister_handler("version", \&get_version_handler, 0, 1, 0);
1.263 albertel 3494:
1.246 foxr 3495: # Set the current host and domain. This is used to support
3496: # multihomed systems. Each IP of the system, or even separate daemons
3497: # on the same IP can be treated as handling a separate lonCAPA virtual
3498: # machine. This command selects the virtual lonCAPA. The client always
3499: # knows the right one since it is lonc and it is selecting the domain/system
3500: # from the hosts.tab file.
3501: # Parameters:
3502: # $cmd - Command that dispatched us.
3503: # $tail - Tail of the command (domain/host requested).
3504: # $socket - Socket open on the client.
3505: #
3506: # Returns:
3507: # 1 - Indicates the program should continue to process requests.
3508: # Side-effects:
3509: # The default domain/system context is modified for this daemon.
3510: # a reply is sent to the client.
3511: #
3512: sub set_virtual_host_handler {
3513: my ($cmd, $tail, $socket) = @_;
3514:
3515: my $userinput ="$cmd:$tail";
3516:
3517: &Reply($client, &sethost($userinput)."\n", $userinput);
3518:
3519:
3520: return 1;
3521: }
1.247 albertel 3522: ®ister_handler("sethost", \&set_virtual_host_handler, 0, 1, 0);
1.246 foxr 3523:
3524: # Process a request to exit:
3525: # - "bye" is sent to the client.
3526: # - The client socket is shutdown and closed.
3527: # - We indicate to the caller that we should exit.
3528: # Formal Parameters:
3529: # $cmd - The command that got us here.
3530: # $tail - Tail of the command (empty).
3531: # $client - Socket open on the tail.
3532: # Returns:
3533: # 0 - Indicating the program should exit!!
3534: #
3535: sub exit_handler {
3536: my ($cmd, $tail, $client) = @_;
3537:
3538: my $userinput = "$cmd:$tail";
3539:
3540: &logthis("Client $clientip ($clientname) hanging up: $userinput");
3541: &Reply($client, "bye\n", $userinput);
3542: $client->shutdown(2); # shutdown the socket forcibly.
3543: $client->close();
3544:
3545: return 0;
3546: }
1.248 foxr 3547: ®ister_handler("exit", \&exit_handler, 0,1,1);
3548: ®ister_handler("init", \&exit_handler, 0,1,1);
3549: ®ister_handler("quit", \&exit_handler, 0,1,1);
3550:
3551: # Determine if auto-enrollment is enabled.
3552: # Note that the original had what I believe to be a defect.
3553: # The original returned 0 if the requestor was not a registerd client.
3554: # It should return "refused".
3555: # Formal Parameters:
3556: # $cmd - The command that invoked us.
3557: # $tail - The tail of the command (Extra command parameters.
3558: # $client - The socket open on the client that issued the request.
3559: # Returns:
3560: # 1 - Indicating processing should continue.
3561: #
3562: sub enrollment_enabled_handler {
3563: my ($cmd, $tail, $client) = @_;
3564: my $userinput = $cmd.":".$tail; # For logging purposes.
3565:
3566:
3567: my $cdom = split(/:/, $tail); # Domain we're asking about.
3568: my $outcome = &localenroll::run($cdom);
3569: &Reply($client, "$outcome\n", $userinput);
3570:
3571: return 1;
3572: }
3573: ®ister_handler("autorun", \&enrollment_enabled_handler, 0, 1, 0);
3574:
3575: # Get the official sections for which auto-enrollment is possible.
3576: # Since the admin people won't know about 'unofficial sections'
3577: # we cannot auto-enroll on them.
3578: # Formal Parameters:
3579: # $cmd - The command request that got us dispatched here.
3580: # $tail - The remainder of the request. In our case this
3581: # will be split into:
3582: # $coursecode - The course name from the admin point of view.
3583: # $cdom - The course's domain(?).
3584: # $client - Socket open on the client.
3585: # Returns:
3586: # 1 - Indiciting processing should continue.
3587: #
3588: sub get_sections_handler {
3589: my ($cmd, $tail, $client) = @_;
3590: my $userinput = "$cmd:$tail";
3591:
3592: my ($coursecode, $cdom) = split(/:/, $tail);
3593: my @secs = &localenroll::get_sections($coursecode,$cdom);
3594: my $seclist = &escape(join(':',@secs));
3595:
3596: &Reply($client, "$seclist\n", $userinput);
3597:
3598:
3599: return 1;
3600: }
3601: ®ister_handler("autogetsections", \&get_sections_handler, 0, 1, 0);
3602:
3603: # Validate the owner of a new course section.
3604: #
3605: # Formal Parameters:
3606: # $cmd - Command that got us dispatched.
3607: # $tail - the remainder of the command. For us this consists of a
3608: # colon separated string containing:
3609: # $inst - Course Id from the institutions point of view.
3610: # $owner - Proposed owner of the course.
3611: # $cdom - Domain of the course (from the institutions
3612: # point of view?)..
3613: # $client - Socket open on the client.
3614: #
3615: # Returns:
3616: # 1 - Processing should continue.
3617: #
3618: sub validate_course_owner_handler {
3619: my ($cmd, $tail, $client) = @_;
3620: my $userinput = "$cmd:$tail";
3621: my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
3622:
3623: my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
3624: &Reply($client, "$outcome\n", $userinput);
3625:
3626:
3627:
3628: return 1;
3629: }
3630: ®ister_handler("autonewcourse", \&validate_course_owner_handler, 0, 1, 0);
1.263 albertel 3631:
1.248 foxr 3632: #
3633: # Validate a course section in the official schedule of classes
3634: # from the institutions point of view (part of autoenrollment).
3635: #
3636: # Formal Parameters:
3637: # $cmd - The command request that got us dispatched.
3638: # $tail - The tail of the command. In this case,
3639: # this is a colon separated set of words that will be split
3640: # into:
3641: # $inst_course_id - The course/section id from the
3642: # institutions point of view.
3643: # $cdom - The domain from the institutions
3644: # point of view.
3645: # $client - Socket open on the client.
3646: # Returns:
3647: # 1 - Indicating processing should continue.
3648: #
3649: sub validate_course_section_handler {
3650: my ($cmd, $tail, $client) = @_;
3651: my $userinput = "$cmd:$tail";
3652: my ($inst_course_id, $cdom) = split(/:/, $tail);
3653:
3654: my $outcome=&localenroll::validate_courseID($inst_course_id,$cdom);
3655: &Reply($client, "$outcome\n", $userinput);
3656:
3657:
3658: return 1;
3659: }
3660: ®ister_handler("autovalidatecourse", \&validate_course_section_handler, 0, 1, 0);
3661:
3662: #
3663: # Create a password for a new auto-enrollment user.
3664: # I think/guess, this password allows access to the institutions
3665: # AIS class list server/services. Stuart can correct this comment
3666: # when he finds out how wrong I am.
3667: #
3668: # Formal Parameters:
3669: # $cmd - The command request that got us dispatched.
3670: # $tail - The tail of the command. In this case this is a colon separated
3671: # set of words that will be split into:
3672: # $authparam - An authentication parameter (username??).
3673: # $cdom - The domain of the course from the institution's
3674: # point of view.
3675: # $client - The socket open on the client.
3676: # Returns:
3677: # 1 - continue processing.
3678: #
3679: sub create_auto_enroll_password_handler {
3680: my ($cmd, $tail, $client) = @_;
3681: my $userinput = "$cmd:$tail";
3682:
3683: my ($authparam, $cdom) = split(/:/, $userinput);
3684:
3685: my ($create_passwd,$authchk);
3686: ($authparam,
3687: $create_passwd,
3688: $authchk) = &localenroll::create_password($authparam,$cdom);
3689:
3690: &Reply($client, &escape($authparam.':'.$create_passwd.':'.$authchk)."\n",
3691: $userinput);
3692:
3693:
3694: return 1;
3695: }
3696: ®ister_handler("autocreatepassword", \&create_auto_enroll_password_handler,
3697: 0, 1, 0);
3698:
3699: # Retrieve and remove temporary files created by/during autoenrollment.
3700: #
3701: # Formal Parameters:
3702: # $cmd - The command that got us dispatched.
3703: # $tail - The tail of the command. In our case this is a colon
3704: # separated list that will be split into:
3705: # $filename - The name of the file to remove.
3706: # The filename is given as a path relative to
3707: # the LonCAPA temp file directory.
3708: # $client - Socket open on the client.
3709: #
3710: # Returns:
3711: # 1 - Continue processing.
3712: sub retrieve_auto_file_handler {
3713: my ($cmd, $tail, $client) = @_;
3714: my $userinput = "cmd:$tail";
3715:
3716: my ($filename) = split(/:/, $tail);
3717:
3718: my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
3719: if ( (-e $source) && ($filename ne '') ) {
3720: my $reply = '';
3721: if (open(my $fh,$source)) {
3722: while (<$fh>) {
3723: chomp($_);
3724: $_ =~ s/^\s+//g;
3725: $_ =~ s/\s+$//g;
3726: $reply .= $_;
3727: }
3728: close($fh);
3729: &Reply($client, &escape($reply)."\n", $userinput);
3730:
3731: # Does this have to be uncommented??!? (RF).
3732: #
3733: # unlink($source);
3734: } else {
3735: &Failure($client, "error\n", $userinput);
3736: }
3737: } else {
3738: &Failure($client, "error\n", $userinput);
3739: }
3740:
3741:
3742: return 1;
3743: }
3744: ®ister_handler("autoretrieve", \&retrieve_auto_file_handler, 0,1,0);
3745:
3746: #
3747: # Read and retrieve institutional code format (for support form).
3748: # Formal Parameters:
3749: # $cmd - Command that dispatched us.
3750: # $tail - Tail of the command. In this case it conatins
3751: # the course domain and the coursename.
3752: # $client - Socket open on the client.
3753: # Returns:
3754: # 1 - Continue processing.
3755: #
3756: sub get_institutional_code_format_handler {
3757: my ($cmd, $tail, $client) = @_;
3758: my $userinput = "$cmd:$tail";
3759:
3760: my $reply;
3761: my($cdom,$course) = split(/:/,$tail);
3762: my @pairs = split/\&/,$course;
3763: my %instcodes = ();
3764: my %codes = ();
3765: my @codetitles = ();
3766: my %cat_titles = ();
3767: my %cat_order = ();
3768: foreach (@pairs) {
3769: my ($key,$value) = split/=/,$_;
3770: $instcodes{&unescape($key)} = &unescape($value);
3771: }
3772: my $formatreply = &localenroll::instcode_format($cdom,
3773: \%instcodes,
3774: \%codes,
3775: \@codetitles,
3776: \%cat_titles,
3777: \%cat_order);
3778: if ($formatreply eq 'ok') {
3779: my $codes_str = &hash2str(%codes);
3780: my $codetitles_str = &array2str(@codetitles);
3781: my $cat_titles_str = &hash2str(%cat_titles);
3782: my $cat_order_str = &hash2str(%cat_order);
3783: &Reply($client,
3784: $codes_str.':'.$codetitles_str.':'.$cat_titles_str.':'
3785: .$cat_order_str."\n",
3786: $userinput);
3787: } else {
3788: # this else branch added by RF since if not ok, lonc will
3789: # hang waiting on reply until timeout.
3790: #
3791: &Reply($client, "format_error\n", $userinput);
3792: }
3793:
3794: return 1;
3795: }
1.265 ! albertel 3796: ®ister_handler("autoinstcodeformat",
! 3797: \&get_institutional_code_format_handler,0,1,0);
1.246 foxr 3798:
1.265 ! albertel 3799: #
! 3800: # Gets a student's photo to exist (in the correct image type) in the user's
! 3801: # directory.
! 3802: # Formal Parameters:
! 3803: # $cmd - The command request that got us dispatched.
! 3804: # $tail - A colon separated set of words that will be split into:
! 3805: # $domain - student's domain
! 3806: # $uname - student username
! 3807: # $type - image type desired
! 3808: # $client - The socket open on the client.
! 3809: # Returns:
! 3810: # 1 - continue processing.
! 3811: sub student_photo_handler {
! 3812: my ($cmd, $tail, $client) = @_;
! 3813: my ($domain,$uname,$type) = split(/:/, $tail);
! 3814:
! 3815: my $path=&propath($domain,$uname).
! 3816: '/userfiles/internal/studentphoto.'.$type;
! 3817: if (-e $path) {
! 3818: &Reply($client,"ok\n","$cmd:$tail");
! 3819: return 1;
! 3820: }
! 3821: &mkpath($path);
! 3822: my $file=&localstudentphoto::fetch($domain,$uname);
! 3823: if (!$file) {
! 3824: &Failure($client,"unavailable\n","$cmd:$tail");
! 3825: return 1;
! 3826: }
! 3827: if (!-e $path) { &convert_photo($file,$path); }
! 3828: if (-e $path) {
! 3829: &Reply($client,"ok\n","$cmd:$tail");
! 3830: return 1;
! 3831: }
! 3832: &Failure($client,"unable_to_convert\n","$cmd:$tail");
! 3833: return 1;
! 3834: }
! 3835: ®ister_handler("studentphoto", \&student_photo_handler, 0, 1, 0);
1.246 foxr 3836:
1.264 albertel 3837: # mkpath makes all directories for a file, expects an absolute path with a
3838: # file or a trailing / if just a dir is passed
3839: # returns 1 on success 0 on failure
3840: sub mkpath {
3841: my ($file)=@_;
3842: my @parts=split(/\//,$file,-1);
3843: my $now=$parts[0].'/'.$parts[1].'/'.$parts[2];
3844: for (my $i=3;$i<= ($#parts-1);$i++) {
1.265 ! albertel 3845: $now.='/'.$parts[$i];
1.264 albertel 3846: if (!-e $now) {
3847: if (!mkdir($now,0770)) { return 0; }
3848: }
3849: }
3850: return 1;
3851: }
3852:
1.207 foxr 3853: #---------------------------------------------------------------
3854: #
3855: # Getting, decoding and dispatching requests:
3856: #
3857: #
3858: # Get a Request:
3859: # Gets a Request message from the client. The transaction
3860: # is defined as a 'line' of text. We remove the new line
3861: # from the text line.
1.226 foxr 3862: #
1.211 albertel 3863: sub get_request {
1.207 foxr 3864: my $input = <$client>;
3865: chomp($input);
1.226 foxr 3866:
1.234 foxr 3867: &Debug("get_request: Request = $input\n");
1.207 foxr 3868:
3869: &status('Processing '.$clientname.':'.$input);
3870:
3871: return $input;
3872: }
1.212 foxr 3873: #---------------------------------------------------------------
3874: #
3875: # Process a request. This sub should shrink as each action
3876: # gets farmed out into a separat sub that is registered
3877: # with the dispatch hash.
3878: #
3879: # Parameters:
3880: # user_input - The request received from the client (lonc).
3881: # Returns:
3882: # true to keep processing, false if caller should exit.
3883: #
3884: sub process_request {
3885: my ($userinput) = @_; # Easier for now to break style than to
3886: # fix all the userinput -> user_input.
3887: my $wasenc = 0; # True if request was encrypted.
3888: # ------------------------------------------------------------ See if encrypted
3889: if ($userinput =~ /^enc/) {
3890: $userinput = decipher($userinput);
3891: $wasenc=1;
3892: if(!$userinput) { # Cipher not defined.
1.251 foxr 3893: &Failure($client, "error: Encrypted data without negotated key\n");
1.212 foxr 3894: return 0;
3895: }
3896: }
3897: Debug("process_request: $userinput\n");
3898:
1.213 foxr 3899: #
3900: # The 'correct way' to add a command to lond is now to
3901: # write a sub to execute it and Add it to the command dispatch
3902: # hash via a call to register_handler.. The comments to that
3903: # sub should give you enough to go on to show how to do this
3904: # along with the examples that are building up as this code
3905: # is getting refactored. Until all branches of the
3906: # if/elseif monster below have been factored out into
3907: # separate procesor subs, if the dispatch hash is missing
3908: # the command keyword, we will fall through to the remainder
3909: # of the if/else chain below in order to keep this thing in
3910: # working order throughout the transmogrification.
3911:
3912: my ($command, $tail) = split(/:/, $userinput, 2);
3913: chomp($command);
3914: chomp($tail);
3915: $tail =~ s/(\r)//; # This helps people debugging with e.g. telnet.
1.214 foxr 3916: $command =~ s/(\r)//; # And this too for parameterless commands.
3917: if(!$tail) {
3918: $tail =""; # defined but blank.
3919: }
1.213 foxr 3920:
3921: &Debug("Command received: $command, encoded = $wasenc");
3922:
3923: if(defined $Dispatcher{$command}) {
3924:
3925: my $dispatch_info = $Dispatcher{$command};
3926: my $handler = $$dispatch_info[0];
3927: my $need_encode = $$dispatch_info[1];
3928: my $client_types = $$dispatch_info[2];
3929: Debug("Matched dispatch hash: mustencode: $need_encode "
3930: ."ClientType $client_types");
3931:
3932: # Validate the request:
3933:
3934: my $ok = 1;
3935: my $requesterprivs = 0;
3936: if(&isClient()) {
3937: $requesterprivs |= $CLIENT_OK;
3938: }
3939: if(&isManager()) {
3940: $requesterprivs |= $MANAGER_OK;
3941: }
3942: if($need_encode && (!$wasenc)) {
3943: Debug("Must encode but wasn't: $need_encode $wasenc");
3944: $ok = 0;
3945: }
3946: if(($client_types & $requesterprivs) == 0) {
3947: Debug("Client not privileged to do this operation");
3948: $ok = 0;
3949: }
3950:
3951: if($ok) {
3952: Debug("Dispatching to handler $command $tail");
3953: my $keep_going = &$handler($command, $tail, $client);
3954: return $keep_going;
3955: } else {
3956: Debug("Refusing to dispatch because client did not match requirements");
3957: Failure($client, "refused\n", $userinput);
3958: return 1;
3959: }
3960:
3961: }
3962:
1.262 foxr 3963: print $client "unknown_cmd\n";
1.212 foxr 3964: # -------------------------------------------------------------------- complete
3965: Debug("process_request - returning 1");
3966: return 1;
3967: }
1.207 foxr 3968: #
3969: # Decipher encoded traffic
3970: # Parameters:
3971: # input - Encoded data.
3972: # Returns:
3973: # Decoded data or undef if encryption key was not yet negotiated.
3974: # Implicit input:
3975: # cipher - This global holds the negotiated encryption key.
3976: #
1.211 albertel 3977: sub decipher {
1.207 foxr 3978: my ($input) = @_;
3979: my $output = '';
1.212 foxr 3980:
3981:
1.207 foxr 3982: if($cipher) {
3983: my($enc, $enclength, $encinput) = split(/:/, $input);
3984: for(my $encidx = 0; $encidx < length($encinput); $encidx += 16) {
3985: $output .=
3986: $cipher->decrypt(pack("H16", substr($encinput, $encidx, 16)));
3987: }
3988: return substr($output, 0, $enclength);
3989: } else {
3990: return undef;
3991: }
3992: }
3993:
3994: #
3995: # Register a command processor. This function is invoked to register a sub
3996: # to process a request. Once registered, the ProcessRequest sub can automatically
3997: # dispatch requests to an appropriate sub, and do the top level validity checking
3998: # as well:
3999: # - Is the keyword recognized.
4000: # - Is the proper client type attempting the request.
4001: # - Is the request encrypted if it has to be.
4002: # Parameters:
4003: # $request_name - Name of the request being registered.
4004: # This is the command request that will match
4005: # against the hash keywords to lookup the information
4006: # associated with the dispatch information.
4007: # $procedure - Reference to a sub to call to process the request.
4008: # All subs get called as follows:
4009: # Procedure($cmd, $tail, $replyfd, $key)
4010: # $cmd - the actual keyword that invoked us.
4011: # $tail - the tail of the request that invoked us.
4012: # $replyfd- File descriptor connected to the client
4013: # $must_encode - True if the request must be encoded to be good.
4014: # $client_ok - True if it's ok for a client to request this.
4015: # $manager_ok - True if it's ok for a manager to request this.
4016: # Side effects:
4017: # - On success, the Dispatcher hash has an entry added for the key $RequestName
4018: # - On failure, the program will die as it's a bad internal bug to try to
4019: # register a duplicate command handler.
4020: #
1.211 albertel 4021: sub register_handler {
1.212 foxr 4022: my ($request_name,$procedure,$must_encode, $client_ok,$manager_ok) = @_;
1.207 foxr 4023:
4024: # Don't allow duplication#
4025:
4026: if (defined $Dispatcher{$request_name}) {
4027: die "Attempting to define a duplicate request handler for $request_name\n";
4028: }
4029: # Build the client type mask:
4030:
4031: my $client_type_mask = 0;
4032: if($client_ok) {
4033: $client_type_mask |= $CLIENT_OK;
4034: }
4035: if($manager_ok) {
4036: $client_type_mask |= $MANAGER_OK;
4037: }
4038:
4039: # Enter the hash:
4040:
4041: my @entry = ($procedure, $must_encode, $client_type_mask);
4042:
4043: $Dispatcher{$request_name} = \@entry;
4044:
4045: }
4046:
4047:
4048: #------------------------------------------------------------------
4049:
4050:
4051:
4052:
1.141 foxr 4053: #
1.96 foxr 4054: # Convert an error return code from lcpasswd to a string value.
4055: #
4056: sub lcpasswdstrerror {
4057: my $ErrorCode = shift;
1.97 foxr 4058: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
1.96 foxr 4059: return "lcpasswd Unrecognized error return value ".$ErrorCode;
4060: } else {
1.98 foxr 4061: return $passwderrors[$ErrorCode];
1.96 foxr 4062: }
4063: }
4064:
1.97 foxr 4065: #
4066: # Convert an error return code from lcuseradd to a string value:
4067: #
4068: sub lcuseraddstrerror {
4069: my $ErrorCode = shift;
4070: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
4071: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
4072: } else {
1.98 foxr 4073: return $adderrors[$ErrorCode];
1.97 foxr 4074: }
4075: }
4076:
1.23 harris41 4077: # grabs exception and records it to log before exiting
4078: sub catchexception {
1.27 albertel 4079: my ($error)=@_;
1.25 www 4080: $SIG{'QUIT'}='DEFAULT';
4081: $SIG{__DIE__}='DEFAULT';
1.165 albertel 4082: &status("Catching exception");
1.190 albertel 4083: &logthis("<font color='red'>CRITICAL: "
1.134 albertel 4084: ."ABNORMAL EXIT. Child $$ for server $thisserver died through "
1.27 albertel 4085: ."a crash with this error msg->[$error]</font>");
1.57 www 4086: &logthis('Famous last words: '.$status.' - '.$lastlog);
1.27 albertel 4087: if ($client) { print $client "error: $error\n"; }
1.59 www 4088: $server->close();
1.27 albertel 4089: die($error);
1.23 harris41 4090: }
1.63 www 4091: sub timeout {
1.165 albertel 4092: &status("Handling Timeout");
1.190 albertel 4093: &logthis("<font color='red'>CRITICAL: TIME OUT ".$$."</font>");
1.63 www 4094: &catchexception('Timeout');
4095: }
1.22 harris41 4096: # -------------------------------- Set signal handlers to record abnormal exits
4097:
1.226 foxr 4098:
1.22 harris41 4099: $SIG{'QUIT'}=\&catchexception;
4100: $SIG{__DIE__}=\&catchexception;
4101:
1.81 matthew 4102: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
1.95 harris41 4103: &status("Read loncapa.conf and loncapa_apache.conf");
4104: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
1.141 foxr 4105: %perlvar=%{$perlvarref};
1.80 harris41 4106: undef $perlvarref;
1.19 www 4107:
1.35 harris41 4108: # ----------------------------- Make sure this process is running from user=www
4109: my $wwwid=getpwnam('www');
4110: if ($wwwid!=$<) {
1.134 albertel 4111: my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4112: my $subj="LON: $currenthostid User ID mismatch";
1.37 harris41 4113: system("echo 'User ID mismatch. lond must be run as user www.' |\
1.35 harris41 4114: mailto $emailto -s '$subj' > /dev/null");
4115: exit 1;
4116: }
4117:
1.19 www 4118: # --------------------------------------------- Check if other instance running
4119:
4120: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
4121:
4122: if (-e $pidfile) {
4123: my $lfh=IO::File->new("$pidfile");
4124: my $pide=<$lfh>;
4125: chomp($pide);
1.29 harris41 4126: if (kill 0 => $pide) { die "already running"; }
1.19 www 4127: }
1.1 albertel 4128:
4129: # ------------------------------------------------------------- Read hosts file
4130:
4131:
4132:
4133: # establish SERVER socket, bind and listen.
4134: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
4135: Type => SOCK_STREAM,
4136: Proto => 'tcp',
4137: Reuse => 1,
4138: Listen => 10 )
1.29 harris41 4139: or die "making socket: $@\n";
1.1 albertel 4140:
4141: # --------------------------------------------------------- Do global variables
4142:
4143: # global variables
4144:
1.134 albertel 4145: my %children = (); # keys are current child process IDs
1.1 albertel 4146:
4147: sub REAPER { # takes care of dead children
4148: $SIG{CHLD} = \&REAPER;
1.165 albertel 4149: &status("Handling child death");
1.178 foxr 4150: my $pid;
4151: do {
4152: $pid = waitpid(-1,&WNOHANG());
4153: if (defined($children{$pid})) {
4154: &logthis("Child $pid died");
4155: delete($children{$pid});
1.183 albertel 4156: } elsif ($pid > 0) {
1.178 foxr 4157: &logthis("Unknown Child $pid died");
4158: }
4159: } while ( $pid > 0 );
4160: foreach my $child (keys(%children)) {
4161: $pid = waitpid($child,&WNOHANG());
4162: if ($pid > 0) {
4163: &logthis("Child $child - $pid looks like we missed it's death");
4164: delete($children{$pid});
4165: }
1.176 albertel 4166: }
1.165 albertel 4167: &status("Finished Handling child death");
1.1 albertel 4168: }
4169:
4170: sub HUNTSMAN { # signal handler for SIGINT
1.165 albertel 4171: &status("Killing children (INT)");
1.1 albertel 4172: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
4173: kill 'INT' => keys %children;
1.59 www 4174: &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.1 albertel 4175: my $execdir=$perlvar{'lonDaemons'};
4176: unlink("$execdir/logs/lond.pid");
1.190 albertel 4177: &logthis("<font color='red'>CRITICAL: Shutting down</font>");
1.165 albertel 4178: &status("Done killing children");
1.1 albertel 4179: exit; # clean up with dignity
4180: }
4181:
4182: sub HUPSMAN { # signal handler for SIGHUP
4183: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
1.165 albertel 4184: &status("Killing children for restart (HUP)");
1.1 albertel 4185: kill 'INT' => keys %children;
1.59 www 4186: &logthis("Free socket: ".shutdown($server,2)); # free up socket
1.190 albertel 4187: &logthis("<font color='red'>CRITICAL: Restarting</font>");
1.134 albertel 4188: my $execdir=$perlvar{'lonDaemons'};
1.30 harris41 4189: unlink("$execdir/logs/lond.pid");
1.165 albertel 4190: &status("Restarting self (HUP)");
1.1 albertel 4191: exec("$execdir/lond"); # here we go again
4192: }
4193:
1.144 foxr 4194: #
1.148 foxr 4195: # Kill off hashes that describe the host table prior to re-reading it.
4196: # Hashes affected are:
1.200 matthew 4197: # %hostid, %hostdom %hostip %hostdns.
1.148 foxr 4198: #
4199: sub KillHostHashes {
4200: foreach my $key (keys %hostid) {
4201: delete $hostid{$key};
4202: }
4203: foreach my $key (keys %hostdom) {
4204: delete $hostdom{$key};
4205: }
4206: foreach my $key (keys %hostip) {
4207: delete $hostip{$key};
4208: }
1.200 matthew 4209: foreach my $key (keys %hostdns) {
4210: delete $hostdns{$key};
4211: }
1.148 foxr 4212: }
4213: #
4214: # Read in the host table from file and distribute it into the various hashes:
4215: #
4216: # - %hostid - Indexed by IP, the loncapa hostname.
4217: # - %hostdom - Indexed by loncapa hostname, the domain.
4218: # - %hostip - Indexed by hostid, the Ip address of the host.
4219: sub ReadHostTable {
4220:
4221: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
1.200 matthew 4222: my $myloncapaname = $perlvar{'lonHostID'};
4223: Debug("My loncapa name is : $myloncapaname");
1.148 foxr 4224: while (my $configline=<CONFIG>) {
1.178 foxr 4225: if (!($configline =~ /^\s*\#/)) {
4226: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
4227: chomp($ip); $ip=~s/\D+$//;
1.200 matthew 4228: $hostid{$ip}=$id; # LonCAPA name of host by IP.
4229: $hostdom{$id}=$domain; # LonCAPA domain name of host.
4230: $hostip{$id}=$ip; # IP address of host.
4231: $hostdns{$name} = $id; # LonCAPA name of host by DNS.
4232:
4233: if ($id eq $perlvar{'lonHostID'}) {
4234: Debug("Found me in the host table: $name");
4235: $thisserver=$name;
4236: }
1.178 foxr 4237: }
1.148 foxr 4238: }
4239: close(CONFIG);
4240: }
4241: #
4242: # Reload the Apache daemon's state.
1.150 foxr 4243: # This is done by invoking /home/httpd/perl/apachereload
4244: # a setuid perl script that can be root for us to do this job.
1.148 foxr 4245: #
4246: sub ReloadApache {
1.150 foxr 4247: my $execdir = $perlvar{'lonDaemons'};
4248: my $script = $execdir."/apachereload";
4249: system($script);
1.148 foxr 4250: }
4251:
4252: #
1.144 foxr 4253: # Called in response to a USR2 signal.
4254: # - Reread hosts.tab
4255: # - All children connected to hosts that were removed from hosts.tab
4256: # are killed via SIGINT
4257: # - All children connected to previously existing hosts are sent SIGUSR1
4258: # - Our internal hosts hash is updated to reflect the new contents of
4259: # hosts.tab causing connections from hosts added to hosts.tab to
4260: # now be honored.
4261: #
4262: sub UpdateHosts {
1.165 albertel 4263: &status("Reload hosts.tab");
1.147 foxr 4264: logthis('<font color="blue"> Updating connections </font>');
1.148 foxr 4265: #
4266: # The %children hash has the set of IP's we currently have children
4267: # on. These need to be matched against records in the hosts.tab
4268: # Any ip's no longer in the table get killed off they correspond to
4269: # either dropped or changed hosts. Note that the re-read of the table
4270: # will take care of new and changed hosts as connections come into being.
4271:
4272:
4273: KillHostHashes;
4274: ReadHostTable;
4275:
4276: foreach my $child (keys %children) {
4277: my $childip = $children{$child};
4278: if(!$hostid{$childip}) {
1.149 foxr 4279: logthis('<font color="blue"> UpdateHosts killing child '
4280: ." $child for ip $childip </font>");
1.148 foxr 4281: kill('INT', $child);
1.149 foxr 4282: } else {
4283: logthis('<font color="green"> keeping child for ip '
4284: ." $childip (pid=$child) </font>");
1.148 foxr 4285: }
4286: }
4287: ReloadApache;
1.165 albertel 4288: &status("Finished reloading hosts.tab");
1.144 foxr 4289: }
4290:
1.148 foxr 4291:
1.57 www 4292: sub checkchildren {
1.165 albertel 4293: &status("Checking on the children (sending signals)");
1.57 www 4294: &initnewstatus();
4295: &logstatus();
4296: &logthis('Going to check on the children');
1.134 albertel 4297: my $docdir=$perlvar{'lonDocRoot'};
1.61 harris41 4298: foreach (sort keys %children) {
1.221 albertel 4299: #sleep 1;
1.57 www 4300: unless (kill 'USR1' => $_) {
4301: &logthis ('Child '.$_.' is dead');
4302: &logstatus($$.' is dead');
1.221 albertel 4303: delete($children{$_});
1.57 www 4304: }
1.61 harris41 4305: }
1.63 www 4306: sleep 5;
1.212 foxr 4307: $SIG{ALRM} = sub { Debug("timeout");
4308: die "timeout"; };
1.113 albertel 4309: $SIG{__DIE__} = 'DEFAULT';
1.165 albertel 4310: &status("Checking on the children (waiting for reports)");
1.63 www 4311: foreach (sort keys %children) {
4312: unless (-e "$docdir/lon-status/londchld/$_.txt") {
1.113 albertel 4313: eval {
4314: alarm(300);
1.63 www 4315: &logthis('Child '.$_.' did not respond');
1.67 albertel 4316: kill 9 => $_;
1.131 albertel 4317: #$emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
4318: #$subj="LON: $currenthostid killed lond process $_";
4319: #my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
4320: #$execdir=$perlvar{'lonDaemons'};
4321: #$result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
1.221 albertel 4322: delete($children{$_});
1.113 albertel 4323: alarm(0);
4324: }
1.63 www 4325: }
4326: }
1.113 albertel 4327: $SIG{ALRM} = 'DEFAULT';
1.155 albertel 4328: $SIG{__DIE__} = \&catchexception;
1.165 albertel 4329: &status("Finished checking children");
1.221 albertel 4330: &logthis('Finished Checking children');
1.57 www 4331: }
4332:
1.1 albertel 4333: # --------------------------------------------------------------------- Logging
4334:
4335: sub logthis {
4336: my $message=shift;
4337: my $execdir=$perlvar{'lonDaemons'};
4338: my $fh=IO::File->new(">>$execdir/logs/lond.log");
4339: my $now=time;
4340: my $local=localtime($now);
1.58 www 4341: $lastlog=$local.': '.$message;
1.1 albertel 4342: print $fh "$local ($$): $message\n";
4343: }
4344:
1.77 foxr 4345: # ------------------------- Conditional log if $DEBUG true.
4346: sub Debug {
4347: my $message = shift;
4348: if($DEBUG) {
4349: &logthis($message);
4350: }
4351: }
1.161 foxr 4352:
4353: #
4354: # Sub to do replies to client.. this gives a hook for some
4355: # debug tracing too:
4356: # Parameters:
4357: # fd - File open on client.
4358: # reply - Text to send to client.
4359: # request - Original request from client.
4360: #
4361: sub Reply {
1.192 foxr 4362: my ($fd, $reply, $request) = @_;
1.161 foxr 4363: print $fd $reply;
4364: Debug("Request was $request Reply was $reply");
4365:
1.212 foxr 4366: $Transactions++;
4367:
4368:
4369: }
4370:
4371:
4372: #
4373: # Sub to report a failure.
4374: # This function:
4375: # - Increments the failure statistic counters.
4376: # - Invokes Reply to send the error message to the client.
4377: # Parameters:
4378: # fd - File descriptor open on the client
4379: # reply - Reply text to emit.
4380: # request - The original request message (used by Reply
4381: # to debug if that's enabled.
4382: # Implicit outputs:
4383: # $Failures- The number of failures is incremented.
4384: # Reply (invoked here) sends a message to the
4385: # client:
4386: #
4387: sub Failure {
4388: my $fd = shift;
4389: my $reply = shift;
4390: my $request = shift;
4391:
4392: $Failures++;
4393: Reply($fd, $reply, $request); # That's simple eh?
1.161 foxr 4394: }
1.57 www 4395: # ------------------------------------------------------------------ Log status
4396:
4397: sub logstatus {
1.178 foxr 4398: &status("Doing logging");
4399: my $docdir=$perlvar{'lonDocRoot'};
4400: {
4401: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
1.200 matthew 4402: print $fh $status."\n".$lastlog."\n".time."\n$keymode";
1.178 foxr 4403: $fh->close();
4404: }
1.221 albertel 4405: &status("Finished $$.txt");
4406: {
4407: open(LOG,">>$docdir/lon-status/londstatus.txt");
4408: flock(LOG,LOCK_EX);
4409: print LOG $$."\t".$clientname."\t".$currenthostid."\t"
4410: .$status."\t".$lastlog."\t $keymode\n";
4411: flock(DB,LOCK_UN);
4412: close(LOG);
4413: }
1.178 foxr 4414: &status("Finished logging");
1.57 www 4415: }
4416:
4417: sub initnewstatus {
4418: my $docdir=$perlvar{'lonDocRoot'};
4419: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
4420: my $now=time;
4421: my $local=localtime($now);
4422: print $fh "LOND status $local - parent $$\n\n";
1.64 www 4423: opendir(DIR,"$docdir/lon-status/londchld");
1.134 albertel 4424: while (my $filename=readdir(DIR)) {
1.64 www 4425: unlink("$docdir/lon-status/londchld/$filename");
4426: }
4427: closedir(DIR);
1.57 www 4428: }
4429:
4430: # -------------------------------------------------------------- Status setting
4431:
4432: sub status {
4433: my $what=shift;
4434: my $now=time;
4435: my $local=localtime($now);
1.178 foxr 4436: $status=$local.': '.$what;
4437: $0='lond: '.$what.' '.$local;
1.57 www 4438: }
1.11 www 4439:
4440: # -------------------------------------------------------- Escape Special Chars
4441:
4442: sub escape {
4443: my $str=shift;
4444: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
4445: return $str;
4446: }
4447:
4448: # ----------------------------------------------------- Un-Escape Special Chars
4449:
4450: sub unescape {
4451: my $str=shift;
4452: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
4453: return $str;
4454: }
4455:
1.1 albertel 4456: # ----------------------------------------------------------- Send USR1 to lonc
4457:
4458: sub reconlonc {
4459: my $peerfile=shift;
4460: &logthis("Trying to reconnect for $peerfile");
4461: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
4462: if (my $fh=IO::File->new("$loncfile")) {
4463: my $loncpid=<$fh>;
4464: chomp($loncpid);
4465: if (kill 0 => $loncpid) {
4466: &logthis("lonc at pid $loncpid responding, sending USR1");
4467: kill USR1 => $loncpid;
4468: } else {
1.9 www 4469: &logthis(
1.190 albertel 4470: "<font color='red'>CRITICAL: "
1.9 www 4471: ."lonc at pid $loncpid not responding, giving up</font>");
1.1 albertel 4472: }
4473: } else {
1.190 albertel 4474: &logthis('<font color="red">CRITICAL: lonc not running, giving up</font>');
1.1 albertel 4475: }
4476: }
4477:
4478: # -------------------------------------------------- Non-critical communication
1.11 www 4479:
1.1 albertel 4480: sub subreply {
4481: my ($cmd,$server)=@_;
4482: my $peerfile="$perlvar{'lonSockDir'}/$server";
4483: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
4484: Type => SOCK_STREAM,
4485: Timeout => 10)
4486: or return "con_lost";
4487: print $sclient "$cmd\n";
4488: my $answer=<$sclient>;
4489: chomp($answer);
4490: if (!$answer) { $answer="con_lost"; }
4491: return $answer;
4492: }
4493:
4494: sub reply {
4495: my ($cmd,$server)=@_;
4496: my $answer;
1.115 albertel 4497: if ($server ne $currenthostid) {
1.1 albertel 4498: $answer=subreply($cmd,$server);
4499: if ($answer eq 'con_lost') {
4500: $answer=subreply("ping",$server);
4501: if ($answer ne $server) {
1.115 albertel 4502: &logthis("sub reply: answer != server answer is $answer, server is $server");
1.1 albertel 4503: &reconlonc("$perlvar{'lonSockDir'}/$server");
4504: }
4505: $answer=subreply($cmd,$server);
4506: }
4507: } else {
4508: $answer='self_reply';
4509: }
4510: return $answer;
4511: }
4512:
1.13 www 4513: # -------------------------------------------------------------- Talk to lonsql
4514:
1.234 foxr 4515: sub sql_reply {
1.12 harris41 4516: my ($cmd)=@_;
1.234 foxr 4517: my $answer=&sub_sql_reply($cmd);
4518: if ($answer eq 'con_lost') { $answer=&sub_sql_reply($cmd); }
1.12 harris41 4519: return $answer;
4520: }
4521:
1.234 foxr 4522: sub sub_sql_reply {
1.12 harris41 4523: my ($cmd)=@_;
4524: my $unixsock="mysqlsock";
4525: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
4526: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
4527: Type => SOCK_STREAM,
4528: Timeout => 10)
4529: or return "con_lost";
4530: print $sclient "$cmd\n";
4531: my $answer=<$sclient>;
4532: chomp($answer);
4533: if (!$answer) { $answer="con_lost"; }
4534: return $answer;
4535: }
4536:
1.1 albertel 4537: # -------------------------------------------- Return path to profile directory
1.11 www 4538:
1.1 albertel 4539: sub propath {
4540: my ($udom,$uname)=@_;
4541: $udom=~s/\W//g;
4542: $uname=~s/\W//g;
1.16 www 4543: my $subdir=$uname.'__';
1.1 albertel 4544: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
4545: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
4546: return $proname;
4547: }
4548:
4549: # --------------------------------------- Is this the home server of an author?
1.11 www 4550:
1.1 albertel 4551: sub ishome {
4552: my $author=shift;
4553: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
4554: my ($udom,$uname)=split(/\//,$author);
4555: my $proname=propath($udom,$uname);
4556: if (-e $proname) {
4557: return 'owner';
4558: } else {
4559: return 'not_owner';
4560: }
4561: }
4562:
4563: # ======================================================= Continue main program
4564: # ---------------------------------------------------- Fork once and dissociate
4565:
1.134 albertel 4566: my $fpid=fork;
1.1 albertel 4567: exit if $fpid;
1.29 harris41 4568: die "Couldn't fork: $!" unless defined ($fpid);
1.1 albertel 4569:
1.29 harris41 4570: POSIX::setsid() or die "Can't start new session: $!";
1.1 albertel 4571:
4572: # ------------------------------------------------------- Write our PID on disk
4573:
1.134 albertel 4574: my $execdir=$perlvar{'lonDaemons'};
1.1 albertel 4575: open (PIDSAVE,">$execdir/logs/lond.pid");
4576: print PIDSAVE "$$\n";
4577: close(PIDSAVE);
1.190 albertel 4578: &logthis("<font color='red'>CRITICAL: ---------- Starting ----------</font>");
1.57 www 4579: &status('Starting');
1.1 albertel 4580:
1.106 foxr 4581:
1.1 albertel 4582:
4583: # ----------------------------------------------------- Install signal handlers
4584:
1.57 www 4585:
1.1 albertel 4586: $SIG{CHLD} = \&REAPER;
4587: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
4588: $SIG{HUP} = \&HUPSMAN;
1.57 www 4589: $SIG{USR1} = \&checkchildren;
1.144 foxr 4590: $SIG{USR2} = \&UpdateHosts;
1.106 foxr 4591:
1.148 foxr 4592: # Read the host hashes:
4593:
4594: ReadHostTable;
1.106 foxr 4595:
4596: # --------------------------------------------------------------
4597: # Accept connections. When a connection comes in, it is validated
4598: # and if good, a child process is created to process transactions
4599: # along the connection.
4600:
1.1 albertel 4601: while (1) {
1.165 albertel 4602: &status('Starting accept');
1.106 foxr 4603: $client = $server->accept() or next;
1.165 albertel 4604: &status('Accepted '.$client.' off to spawn');
1.106 foxr 4605: make_new_child($client);
1.165 albertel 4606: &status('Finished spawning');
1.1 albertel 4607: }
4608:
1.212 foxr 4609: sub make_new_child {
4610: my $pid;
4611: # my $cipher; # Now global
4612: my $sigset;
1.178 foxr 4613:
1.212 foxr 4614: $client = shift;
4615: &status('Starting new child '.$client);
4616: &logthis('<font color="green"> Attempting to start child ('.$client.
4617: ")</font>");
4618: # block signal for fork
4619: $sigset = POSIX::SigSet->new(SIGINT);
4620: sigprocmask(SIG_BLOCK, $sigset)
4621: or die "Can't block SIGINT for fork: $!\n";
1.178 foxr 4622:
1.212 foxr 4623: die "fork: $!" unless defined ($pid = fork);
1.178 foxr 4624:
1.212 foxr 4625: $client->sockopt(SO_KEEPALIVE, 1); # Enable monitoring of
4626: # connection liveness.
1.178 foxr 4627:
1.212 foxr 4628: #
4629: # Figure out who we're talking to so we can record the peer in
4630: # the pid hash.
4631: #
4632: my $caller = getpeername($client);
4633: my ($port,$iaddr);
4634: if (defined($caller) && length($caller) > 0) {
4635: ($port,$iaddr)=unpack_sockaddr_in($caller);
4636: } else {
4637: &logthis("Unable to determine who caller was, getpeername returned nothing");
4638: }
4639: if (defined($iaddr)) {
4640: $clientip = inet_ntoa($iaddr);
4641: Debug("Connected with $clientip");
4642: $clientdns = gethostbyaddr($iaddr, AF_INET);
4643: Debug("Connected with $clientdns by name");
4644: } else {
4645: &logthis("Unable to determine clientip");
4646: $clientip='Unavailable';
4647: }
4648:
4649: if ($pid) {
4650: # Parent records the child's birth and returns.
4651: sigprocmask(SIG_UNBLOCK, $sigset)
4652: or die "Can't unblock SIGINT for fork: $!\n";
4653: $children{$pid} = $clientip;
4654: &status('Started child '.$pid);
4655: return;
4656: } else {
4657: # Child can *not* return from this subroutine.
4658: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
4659: $SIG{CHLD} = 'DEFAULT'; #make this default so that pwauth returns
4660: #don't get intercepted
4661: $SIG{USR1}= \&logstatus;
4662: $SIG{ALRM}= \&timeout;
4663: $lastlog='Forked ';
4664: $status='Forked';
1.178 foxr 4665:
1.212 foxr 4666: # unblock signals
4667: sigprocmask(SIG_UNBLOCK, $sigset)
4668: or die "Can't unblock SIGINT for fork: $!\n";
1.178 foxr 4669:
1.212 foxr 4670: # my $tmpsnum=0; # Now global
4671: #---------------------------------------------------- kerberos 5 initialization
4672: &Authen::Krb5::init_context();
4673: &Authen::Krb5::init_ets();
1.209 albertel 4674:
1.212 foxr 4675: &status('Accepted connection');
4676: # =============================================================================
4677: # do something with the connection
4678: # -----------------------------------------------------------------------------
4679: # see if we know client and 'check' for spoof IP by ineffective challenge
1.178 foxr 4680:
1.212 foxr 4681: ReadManagerTable; # May also be a manager!!
4682:
4683: my $clientrec=($hostid{$clientip} ne undef);
4684: my $ismanager=($managers{$clientip} ne undef);
4685: $clientname = "[unknonwn]";
4686: if($clientrec) { # Establish client type.
4687: $ConnectionType = "client";
4688: $clientname = $hostid{$clientip};
4689: if($ismanager) {
4690: $ConnectionType = "both";
4691: }
4692: } else {
4693: $ConnectionType = "manager";
4694: $clientname = $managers{$clientip};
4695: }
4696: my $clientok;
1.178 foxr 4697:
1.212 foxr 4698: if ($clientrec || $ismanager) {
4699: &status("Waiting for init from $clientip $clientname");
4700: &logthis('<font color="yellow">INFO: Connection, '.
4701: $clientip.
4702: " ($clientname) connection type = $ConnectionType </font>" );
4703: &status("Connecting $clientip ($clientname))");
4704: my $remotereq=<$client>;
4705: chomp($remotereq);
4706: Debug("Got init: $remotereq");
4707: my $inikeyword = split(/:/, $remotereq);
4708: if ($remotereq =~ /^init/) {
4709: &sethost("sethost:$perlvar{'lonHostID'}");
4710: #
4711: # If the remote is attempting a local init... give that a try:
4712: #
4713: my ($i, $inittype) = split(/:/, $remotereq);
1.209 albertel 4714:
1.212 foxr 4715: # If the connection type is ssl, but I didn't get my
4716: # certificate files yet, then I'll drop back to
4717: # insecure (if allowed).
4718:
4719: if($inittype eq "ssl") {
4720: my ($ca, $cert) = lonssl::CertificateFile;
4721: my $kfile = lonssl::KeyFile;
4722: if((!$ca) ||
4723: (!$cert) ||
4724: (!$kfile)) {
4725: $inittype = ""; # This forces insecure attempt.
4726: &logthis("<font color=\"blue\"> Certificates not "
4727: ."installed -- trying insecure auth</font>");
1.224 foxr 4728: } else { # SSL certificates are in place so
1.212 foxr 4729: } # Leave the inittype alone.
4730: }
4731:
4732: if($inittype eq "local") {
4733: my $key = LocalConnection($client, $remotereq);
4734: if($key) {
4735: Debug("Got local key $key");
4736: $clientok = 1;
4737: my $cipherkey = pack("H32", $key);
4738: $cipher = new IDEA($cipherkey);
4739: print $client "ok:local\n";
4740: &logthis('<font color="green"'
4741: . "Successful local authentication </font>");
4742: $keymode = "local"
1.178 foxr 4743: } else {
1.212 foxr 4744: Debug("Failed to get local key");
4745: $clientok = 0;
4746: shutdown($client, 3);
4747: close $client;
1.178 foxr 4748: }
1.212 foxr 4749: } elsif ($inittype eq "ssl") {
4750: my $key = SSLConnection($client);
4751: if ($key) {
4752: $clientok = 1;
4753: my $cipherkey = pack("H32", $key);
4754: $cipher = new IDEA($cipherkey);
4755: &logthis('<font color="green">'
4756: ."Successfull ssl authentication with $clientname </font>");
4757: $keymode = "ssl";
4758:
1.178 foxr 4759: } else {
1.212 foxr 4760: $clientok = 0;
4761: close $client;
1.178 foxr 4762: }
1.212 foxr 4763:
4764: } else {
4765: my $ok = InsecureConnection($client);
4766: if($ok) {
4767: $clientok = 1;
4768: &logthis('<font color="green">'
4769: ."Successful insecure authentication with $clientname </font>");
4770: print $client "ok\n";
4771: $keymode = "insecure";
1.178 foxr 4772: } else {
1.212 foxr 4773: &logthis('<font color="yellow">'
4774: ."Attempted insecure connection disallowed </font>");
4775: close $client;
4776: $clientok = 0;
1.178 foxr 4777:
4778: }
4779: }
1.212 foxr 4780: } else {
4781: &logthis(
4782: "<font color='blue'>WARNING: "
4783: ."$clientip failed to initialize: >$remotereq< </font>");
4784: &status('No init '.$clientip);
4785: }
4786:
4787: } else {
4788: &logthis(
4789: "<font color='blue'>WARNING: Unknown client $clientip</font>");
4790: &status('Hung up on '.$clientip);
4791: }
4792:
4793: if ($clientok) {
4794: # ---------------- New known client connecting, could mean machine online again
4795:
4796: foreach my $id (keys(%hostip)) {
4797: if ($hostip{$id} ne $clientip ||
4798: $hostip{$currenthostid} eq $clientip) {
4799: # no need to try to do recon's to myself
4800: next;
4801: }
4802: &reconlonc("$perlvar{'lonSockDir'}/$id");
4803: }
4804: &logthis("<font color='green'>Established connection: $clientname</font>");
4805: &status('Will listen to '.$clientname);
4806: # ------------------------------------------------------------ Process requests
4807: my $keep_going = 1;
4808: my $user_input;
4809: while(($user_input = get_request) && $keep_going) {
4810: alarm(120);
4811: Debug("Main: Got $user_input\n");
4812: $keep_going = &process_request($user_input);
1.178 foxr 4813: alarm(0);
1.212 foxr 4814: &status('Listening to '.$clientname." ($keymode)");
1.161 foxr 4815: }
1.212 foxr 4816:
1.59 www 4817: # --------------------------------------------- client unknown or fishy, refuse
1.212 foxr 4818: } else {
1.161 foxr 4819: print $client "refused\n";
4820: $client->close();
1.190 albertel 4821: &logthis("<font color='blue'>WARNING: "
1.161 foxr 4822: ."Rejected client $clientip, closing connection</font>");
4823: }
1.212 foxr 4824: }
1.161 foxr 4825:
1.1 albertel 4826: # =============================================================================
1.161 foxr 4827:
1.190 albertel 4828: &logthis("<font color='red'>CRITICAL: "
1.161 foxr 4829: ."Disconnect from $clientip ($clientname)</font>");
4830:
4831:
4832: # this exit is VERY important, otherwise the child will become
4833: # a producer of more and more children, forking yourself into
4834: # process death.
4835: exit;
1.106 foxr 4836:
1.78 foxr 4837: }
1.261 foxr 4838: #
4839: # Determine if a user is an author for the indicated domain.
4840: #
4841: # Parameters:
4842: # domain - domain to check in .
4843: # user - Name of user to check.
4844: #
4845: # Return:
4846: # 1 - User is an author for domain.
4847: # 0 - User is not an author for domain.
4848: sub is_author {
4849: my ($domain, $user) = @_;
4850:
4851: &Debug("is_author: $user @ $domain");
4852:
4853: my $hashref = &tie_user_hash($domain, $user, "roles",
4854: &GDBM_READER());
4855:
4856: # Author role should show up as a key /domain/_au
1.78 foxr 4857:
1.261 foxr 4858: my $key = "/$domain/_au";
4859: my $value = $hashref->{$key};
1.78 foxr 4860:
1.261 foxr 4861: if(defined($value)) {
4862: &Debug("$user @ $domain is an author");
4863: }
4864:
4865: return defined($value);
4866: }
1.78 foxr 4867: #
4868: # Checks to see if the input roleput request was to set
4869: # an author role. If so, invokes the lchtmldir script to set
4870: # up a correct public_html
4871: # Parameters:
4872: # request - The request sent to the rolesput subchunk.
4873: # We're looking for /domain/_au
4874: # domain - The domain in which the user is having roles doctored.
4875: # user - Name of the user for which the role is being put.
4876: # authtype - The authentication type associated with the user.
4877: #
1.230 foxr 4878: sub manage_permissions
1.78 foxr 4879: {
1.192 foxr 4880:
1.261 foxr 4881:
1.192 foxr 4882: my ($request, $domain, $user, $authtype) = @_;
1.78 foxr 4883:
1.261 foxr 4884: &Debug("manage_permissions: $request $domain $user $authtype");
4885:
1.78 foxr 4886: # See if the request is of the form /$domain/_au
4887: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
4888: my $execdir = $perlvar{'lonDaemons'};
4889: my $userhome= "/home/$user" ;
1.134 albertel 4890: &logthis("system $execdir/lchtmldir $userhome $user $authtype");
1.261 foxr 4891: &Debug("Setting homedir permissions for $userhome");
1.78 foxr 4892: system("$execdir/lchtmldir $userhome $user $authtype");
4893: }
4894: }
1.222 foxr 4895:
4896:
4897: #
4898: # Return the full path of a user password file, whether it exists or not.
4899: # Parameters:
4900: # domain - Domain in which the password file lives.
4901: # user - name of the user.
4902: # Returns:
4903: # Full passwd path:
4904: #
4905: sub password_path {
4906: my ($domain, $user) = @_;
1.264 albertel 4907: return &propath($domain, $user).'/passwd';
1.222 foxr 4908: }
4909:
4910: # Password Filename
4911: # Returns the path to a passwd file given domain and user... only if
4912: # it exists.
4913: # Parameters:
4914: # domain - Domain in which to search.
4915: # user - username.
4916: # Returns:
4917: # - If the password file exists returns its path.
4918: # - If the password file does not exist, returns undefined.
4919: #
4920: sub password_filename {
4921: my ($domain, $user) = @_;
4922:
4923: Debug ("PasswordFilename called: dom = $domain user = $user");
4924:
4925: my $path = &password_path($domain, $user);
4926: Debug("PasswordFilename got path: $path");
4927: if(-e $path) {
4928: return $path;
4929: } else {
4930: return undef;
4931: }
4932: }
4933:
4934: #
4935: # Rewrite the contents of the user's passwd file.
4936: # Parameters:
4937: # domain - domain of the user.
4938: # name - User's name.
4939: # contents - New contents of the file.
4940: # Returns:
4941: # 0 - Failed.
4942: # 1 - Success.
4943: #
4944: sub rewrite_password_file {
4945: my ($domain, $user, $contents) = @_;
4946:
4947: my $file = &password_filename($domain, $user);
4948: if (defined $file) {
4949: my $pf = IO::File->new(">$file");
4950: if($pf) {
4951: print $pf "$contents\n";
4952: return 1;
4953: } else {
4954: return 0;
4955: }
4956: } else {
4957: return 0;
4958: }
4959:
4960: }
4961:
1.78 foxr 4962: #
1.222 foxr 4963: # get_auth_type - Determines the authorization type of a user in a domain.
1.78 foxr 4964:
4965: # Returns the authorization type or nouser if there is no such user.
4966: #
1.222 foxr 4967: sub get_auth_type
1.78 foxr 4968: {
1.192 foxr 4969:
4970: my ($domain, $user) = @_;
1.78 foxr 4971:
1.222 foxr 4972: Debug("get_auth_type( $domain, $user ) \n");
1.78 foxr 4973: my $proname = &propath($domain, $user);
4974: my $passwdfile = "$proname/passwd";
4975: if( -e $passwdfile ) {
4976: my $pf = IO::File->new($passwdfile);
4977: my $realpassword = <$pf>;
4978: chomp($realpassword);
1.79 foxr 4979: Debug("Password info = $realpassword\n");
1.78 foxr 4980: my ($authtype, $contentpwd) = split(/:/, $realpassword);
1.79 foxr 4981: Debug("Authtype = $authtype, content = $contentpwd\n");
1.259 raeburn 4982: return "$authtype:$contentpwd";
1.224 foxr 4983: } else {
1.79 foxr 4984: Debug("Returning nouser");
1.78 foxr 4985: return "nouser";
4986: }
1.1 albertel 4987: }
4988:
1.220 foxr 4989: #
4990: # Validate a user given their domain, name and password. This utility
4991: # function is used by both AuthenticateHandler and ChangePasswordHandler
4992: # to validate the login credentials of a user.
4993: # Parameters:
4994: # $domain - The domain being logged into (this is required due to
4995: # the capability for multihomed systems.
4996: # $user - The name of the user being validated.
4997: # $password - The user's propoposed password.
4998: #
4999: # Returns:
5000: # 1 - The domain,user,pasword triplet corresponds to a valid
5001: # user.
5002: # 0 - The domain,user,password triplet is not a valid user.
5003: #
5004: sub validate_user {
5005: my ($domain, $user, $password) = @_;
5006:
5007:
5008: # Why negative ~pi you may well ask? Well this function is about
5009: # authentication, and therefore very important to get right.
5010: # I've initialized the flag that determines whether or not I've
5011: # validated correctly to a value it's not supposed to get.
5012: # At the end of this function. I'll ensure that it's not still that
5013: # value so we don't just wind up returning some accidental value
5014: # as a result of executing an unforseen code path that
1.249 foxr 5015: # did not set $validated. At the end of valid execution paths,
5016: # validated shoule be 1 for success or 0 for failuer.
1.220 foxr 5017:
5018: my $validated = -3.14159;
5019:
5020: # How we authenticate is determined by the type of authentication
5021: # the user has been assigned. If the authentication type is
5022: # "nouser", the user does not exist so we will return 0.
5023:
1.222 foxr 5024: my $contents = &get_auth_type($domain, $user);
1.220 foxr 5025: my ($howpwd, $contentpwd) = split(/:/, $contents);
5026:
5027: my $null = pack("C",0); # Used by kerberos auth types.
5028:
5029: if ($howpwd ne 'nouser') {
5030:
5031: if($howpwd eq "internal") { # Encrypted is in local password file.
5032: $validated = (crypt($password, $contentpwd) eq $contentpwd);
5033: }
5034: elsif ($howpwd eq "unix") { # User is a normal unix user.
5035: $contentpwd = (getpwnam($user))[1];
5036: if($contentpwd) {
5037: if($contentpwd eq 'x') { # Shadow password file...
5038: my $pwauth_path = "/usr/local/sbin/pwauth";
5039: open PWAUTH, "|$pwauth_path" or
5040: die "Cannot invoke authentication";
5041: print PWAUTH "$user\n$password\n";
5042: close PWAUTH;
5043: $validated = ! $?;
5044:
5045: } else { # Passwords in /etc/passwd.
5046: $validated = (crypt($password,
5047: $contentpwd) eq $contentpwd);
5048: }
5049: } else {
5050: $validated = 0;
5051: }
5052: }
5053: elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
5054: if(! ($password =~ /$null/) ) {
5055: my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
5056: "",
5057: $contentpwd,,
5058: 'krbtgt',
5059: $contentpwd,
5060: 1,
5061: $password);
5062: if(!$k4error) {
5063: $validated = 1;
1.224 foxr 5064: } else {
1.220 foxr 5065: $validated = 0;
5066: &logthis('krb4: '.$user.', '.$contentpwd.', '.
5067: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
5068: }
1.224 foxr 5069: } else {
1.220 foxr 5070: $validated = 0; # Password has a match with null.
5071: }
1.224 foxr 5072: } elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
1.220 foxr 5073: if(!($password =~ /$null/)) { # Null password not allowed.
5074: my $krbclient = &Authen::Krb5::parse_name($user.'@'
5075: .$contentpwd);
5076: my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
5077: my $krbserver = &Authen::Krb5::parse_name($krbservice);
5078: my $credentials= &Authen::Krb5::cc_default();
5079: $credentials->initialize($krbclient);
5080: my $krbreturn = &Authen::KRb5::get_in_tkt_with_password($krbclient,
5081: $krbserver,
5082: $password,
5083: $credentials);
5084: $validated = ($krbreturn == 1);
1.224 foxr 5085: } else {
1.220 foxr 5086: $validated = 0;
5087: }
1.224 foxr 5088: } elsif ($howpwd eq "localauth") {
1.220 foxr 5089: # Authenticate via installation specific authentcation method:
5090: $validated = &localauth::localauth($user,
5091: $password,
5092: $contentpwd);
1.224 foxr 5093: } else { # Unrecognized auth is also bad.
1.220 foxr 5094: $validated = 0;
5095: }
5096: } else {
5097: $validated = 0;
5098: }
5099: #
5100: # $validated has the correct stat of the authentication:
5101: #
5102:
5103: unless ($validated != -3.14159) {
1.249 foxr 5104: # I >really really< want to know if this happens.
5105: # since it indicates that user authentication is badly
5106: # broken in some code path.
5107: #
5108: die "ValidateUser - failed to set the value of validated $domain, $user $password";
1.220 foxr 5109: }
5110: return $validated;
5111: }
5112:
5113:
1.84 albertel 5114: sub addline {
5115: my ($fname,$hostid,$ip,$newline)=@_;
5116: my $contents;
5117: my $found=0;
5118: my $expr='^'.$hostid.':'.$ip.':';
5119: $expr =~ s/\./\\\./g;
1.134 albertel 5120: my $sh;
1.84 albertel 5121: if ($sh=IO::File->new("$fname.subscription")) {
5122: while (my $subline=<$sh>) {
5123: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
5124: }
5125: $sh->close();
5126: }
5127: $sh=IO::File->new(">$fname.subscription");
5128: if ($contents) { print $sh $contents; }
5129: if ($newline) { print $sh $newline; }
5130: $sh->close();
5131: return $found;
1.86 www 5132: }
5133:
1.234 foxr 5134: sub get_chat {
1.122 www 5135: my ($cdom,$cname,$udom,$uname)=@_;
1.87 www 5136: my %hash;
5137: my $proname=&propath($cdom,$cname);
5138: my @entries=();
1.88 albertel 5139: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
5140: &GDBM_READER(),0640)) {
5141: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
5142: untie %hash;
1.123 www 5143: }
1.124 www 5144: my @participants=();
1.134 albertel 5145: my $cutoff=time-60;
1.123 www 5146: if (tie(%hash,'GDBM_File',"$proname/nohist_inchatroom.db",
1.124 www 5147: &GDBM_WRCREAT(),0640)) {
5148: $hash{$uname.':'.$udom}=time;
1.123 www 5149: foreach (sort keys %hash) {
5150: if ($hash{$_}>$cutoff) {
1.124 www 5151: $participants[$#participants+1]='active_participant:'.$_;
1.123 www 5152: }
5153: }
5154: untie %hash;
1.86 www 5155: }
1.124 www 5156: return (@participants,@entries);
1.86 www 5157: }
5158:
1.234 foxr 5159: sub chat_add {
1.88 albertel 5160: my ($cdom,$cname,$newchat)=@_;
5161: my %hash;
5162: my $proname=&propath($cdom,$cname);
5163: my @entries=();
1.142 www 5164: my $time=time;
1.88 albertel 5165: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
5166: &GDBM_WRCREAT(),0640)) {
5167: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
5168: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
5169: my ($thentime,$idnum)=split(/\_/,$lastid);
5170: my $newid=$time.'_000000';
5171: if ($thentime==$time) {
5172: $idnum=~s/^0+//;
5173: $idnum++;
5174: $idnum=substr('000000'.$idnum,-6,6);
5175: $newid=$time.'_'.$idnum;
5176: }
5177: $hash{$newid}=$newchat;
5178: my $expired=$time-3600;
5179: foreach (keys %hash) {
5180: my ($thistime)=($_=~/(\d+)\_/);
5181: if ($thistime<$expired) {
1.89 www 5182: delete $hash{$_};
1.88 albertel 5183: }
5184: }
5185: untie %hash;
1.142 www 5186: }
5187: {
5188: my $hfh;
5189: if ($hfh=IO::File->new(">>$proname/chatroom.log")) {
5190: print $hfh "$time:".&unescape($newchat)."\n";
5191: }
1.86 www 5192: }
1.84 albertel 5193: }
5194:
5195: sub unsub {
5196: my ($fname,$clientip)=@_;
5197: my $result;
1.188 foxr 5198: my $unsubs = 0; # Number of successful unsubscribes:
5199:
5200:
5201: # An old way subscriptions were handled was to have a
5202: # subscription marker file:
5203:
5204: Debug("Attempting unlink of $fname.$clientname");
1.161 foxr 5205: if (unlink("$fname.$clientname")) {
1.188 foxr 5206: $unsubs++; # Successful unsub via marker file.
5207: }
5208:
5209: # The more modern way to do it is to have a subscription list
5210: # file:
5211:
1.84 albertel 5212: if (-e "$fname.subscription") {
1.161 foxr 5213: my $found=&addline($fname,$clientname,$clientip,'');
1.188 foxr 5214: if ($found) {
5215: $unsubs++;
5216: }
5217: }
5218:
5219: # If either or both of these mechanisms succeeded in unsubscribing a
5220: # resource we can return ok:
5221:
5222: if($unsubs) {
5223: $result = "ok\n";
1.84 albertel 5224: } else {
1.188 foxr 5225: $result = "not_subscribed\n";
1.84 albertel 5226: }
1.188 foxr 5227:
1.84 albertel 5228: return $result;
5229: }
5230:
1.101 www 5231: sub currentversion {
5232: my $fname=shift;
5233: my $version=-1;
5234: my $ulsdir='';
5235: if ($fname=~/^(.+)\/[^\/]+$/) {
5236: $ulsdir=$1;
5237: }
1.114 albertel 5238: my ($fnamere1,$fnamere2);
5239: # remove version if already specified
1.101 www 5240: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1.114 albertel 5241: # get the bits that go before and after the version number
5242: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
5243: $fnamere1=$1;
5244: $fnamere2='.'.$2;
5245: }
1.101 www 5246: if (-e $fname) { $version=1; }
5247: if (-e $ulsdir) {
1.134 albertel 5248: if(-d $ulsdir) {
5249: if (opendir(LSDIR,$ulsdir)) {
5250: my $ulsfn;
5251: while ($ulsfn=readdir(LSDIR)) {
1.101 www 5252: # see if this is a regular file (ignore links produced earlier)
1.134 albertel 5253: my $thisfile=$ulsdir.'/'.$ulsfn;
5254: unless (-l $thisfile) {
1.160 www 5255: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E$/) {
1.134 albertel 5256: if ($1>$version) { $version=$1; }
5257: }
5258: }
5259: }
5260: closedir(LSDIR);
5261: $version++;
5262: }
5263: }
5264: }
5265: return $version;
1.101 www 5266: }
5267:
5268: sub thisversion {
5269: my $fname=shift;
5270: my $version=-1;
5271: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
5272: $version=$1;
5273: }
5274: return $version;
5275: }
5276:
1.84 albertel 5277: sub subscribe {
5278: my ($userinput,$clientip)=@_;
5279: my $result;
5280: my ($cmd,$fname)=split(/:/,$userinput);
5281: my $ownership=&ishome($fname);
5282: if ($ownership eq 'owner') {
1.101 www 5283: # explitly asking for the current version?
5284: unless (-e $fname) {
5285: my $currentversion=¤tversion($fname);
5286: if (&thisversion($fname)==$currentversion) {
5287: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
5288: my $root=$1;
5289: my $extension=$2;
5290: symlink($root.'.'.$extension,
5291: $root.'.'.$currentversion.'.'.$extension);
1.102 www 5292: unless ($extension=~/\.meta$/) {
5293: symlink($root.'.'.$extension.'.meta',
5294: $root.'.'.$currentversion.'.'.$extension.'.meta');
5295: }
1.101 www 5296: }
5297: }
5298: }
1.84 albertel 5299: if (-e $fname) {
5300: if (-d $fname) {
5301: $result="directory\n";
5302: } else {
1.161 foxr 5303: if (-e "$fname.$clientname") {&unsub($fname,$clientip);}
1.134 albertel 5304: my $now=time;
1.161 foxr 5305: my $found=&addline($fname,$clientname,$clientip,
5306: "$clientname:$clientip:$now\n");
1.84 albertel 5307: if ($found) { $result="$fname\n"; }
5308: # if they were subscribed to only meta data, delete that
5309: # subscription, when you subscribe to a file you also get
5310: # the metadata
5311: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
5312: $fname=~s/\/home\/httpd\/html\/res/raw/;
5313: $fname="http://$thisserver/".$fname;
5314: $result="$fname\n";
5315: }
5316: } else {
5317: $result="not_found\n";
5318: }
5319: } else {
5320: $result="rejected\n";
5321: }
5322: return $result;
5323: }
1.91 albertel 5324:
5325: sub make_passwd_file {
1.98 foxr 5326: my ($uname, $umode,$npass,$passfilename)=@_;
1.91 albertel 5327: my $result="ok\n";
5328: if ($umode eq 'krb4' or $umode eq 'krb5') {
5329: {
5330: my $pf = IO::File->new(">$passfilename");
1.261 foxr 5331: if ($pf) {
5332: print $pf "$umode:$npass\n";
5333: } else {
5334: $result = "pass_file_failed_error";
5335: }
1.91 albertel 5336: }
5337: } elsif ($umode eq 'internal') {
5338: my $salt=time;
5339: $salt=substr($salt,6,2);
5340: my $ncpass=crypt($npass,$salt);
5341: {
5342: &Debug("Creating internal auth");
5343: my $pf = IO::File->new(">$passfilename");
1.261 foxr 5344: if($pf) {
5345: print $pf "internal:$ncpass\n";
5346: } else {
5347: $result = "pass_file_failed_error";
5348: }
1.91 albertel 5349: }
5350: } elsif ($umode eq 'localauth') {
5351: {
5352: my $pf = IO::File->new(">$passfilename");
1.261 foxr 5353: if($pf) {
5354: print $pf "localauth:$npass\n";
5355: } else {
5356: $result = "pass_file_failed_error";
5357: }
1.91 albertel 5358: }
5359: } elsif ($umode eq 'unix') {
5360: {
1.186 foxr 5361: #
5362: # Don't allow the creation of privileged accounts!!! that would
5363: # be real bad!!!
5364: #
5365: my $uid = getpwnam($uname);
5366: if((defined $uid) && ($uid == 0)) {
5367: &logthis(">>>Attempted to create privilged account blocked");
5368: return "no_priv_account_error\n";
5369: }
5370:
1.223 foxr 5371: my $execpath ="$perlvar{'lonDaemons'}/"."lcuseradd";
1.224 foxr 5372:
5373: my $lc_error_file = $execdir."/tmp/lcuseradd".$$.".status";
1.91 albertel 5374: {
5375: &Debug("Executing external: ".$execpath);
1.98 foxr 5376: &Debug("user = ".$uname.", Password =". $npass);
1.132 matthew 5377: my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
1.91 albertel 5378: print $se "$uname\n";
5379: print $se "$npass\n";
5380: print $se "$npass\n";
1.223 foxr 5381: print $se "$lc_error_file\n"; # Status -> unique file.
1.97 foxr 5382: }
1.223 foxr 5383: my $error = IO::File->new("< $lc_error_file");
5384: my $useraddok = <$error>;
5385: $error->close;
5386: unlink($lc_error_file);
5387:
5388: chomp $useraddok;
5389:
1.97 foxr 5390: if($useraddok > 0) {
1.223 foxr 5391: my $error_text = &lcuseraddstrerror($useraddok);
5392: &logthis("Failed lcuseradd: $error_text");
5393: $result = "lcuseradd_failed:$error_text\n";
1.224 foxr 5394: } else {
1.223 foxr 5395: my $pf = IO::File->new(">$passfilename");
1.261 foxr 5396: if($pf) {
5397: print $pf "unix:\n";
5398: } else {
5399: $result = "pass_file_failed_error";
5400: }
1.91 albertel 5401: }
5402: }
5403: } elsif ($umode eq 'none') {
5404: {
1.223 foxr 5405: my $pf = IO::File->new("> $passfilename");
1.261 foxr 5406: if($pf) {
5407: print $pf "none:\n";
5408: } else {
5409: $result = "pass_file_failed_error";
5410: }
1.91 albertel 5411: }
5412: } else {
5413: $result="auth_mode_error\n";
5414: }
5415: return $result;
1.121 albertel 5416: }
5417:
1.265 ! albertel 5418: sub convert_photo {
! 5419: my ($start,$dest)=@_;
! 5420: system("convert $start $dest");
! 5421: }
! 5422:
1.121 albertel 5423: sub sethost {
5424: my ($remotereq) = @_;
5425: my (undef,$hostid)=split(/:/,$remotereq);
5426: if (!defined($hostid)) { $hostid=$perlvar{'lonHostID'}; }
5427: if ($hostip{$perlvar{'lonHostID'}} eq $hostip{$hostid}) {
1.200 matthew 5428: $currenthostid =$hostid;
1.121 albertel 5429: $currentdomainid=$hostdom{$hostid};
5430: &logthis("Setting hostid to $hostid, and domain to $currentdomainid");
5431: } else {
5432: &logthis("Requested host id $hostid not an alias of ".
5433: $perlvar{'lonHostID'}." refusing connection");
5434: return 'unable_to_set';
5435: }
5436: return 'ok';
5437: }
5438:
5439: sub version {
5440: my ($userinput)=@_;
5441: $remoteVERSION=(split(/:/,$userinput))[1];
5442: return "version:$VERSION";
1.127 albertel 5443: }
1.178 foxr 5444:
1.128 albertel 5445: #There is a copy of this in lonnet.pm
1.127 albertel 5446: sub userload {
5447: my $numusers=0;
5448: {
5449: opendir(LONIDS,$perlvar{'lonIDsDir'});
5450: my $filename;
5451: my $curtime=time;
5452: while ($filename=readdir(LONIDS)) {
5453: if ($filename eq '.' || $filename eq '..') {next;}
1.138 albertel 5454: my ($mtime)=(stat($perlvar{'lonIDsDir'}.'/'.$filename))[9];
1.159 albertel 5455: if ($curtime-$mtime < 1800) { $numusers++; }
1.127 albertel 5456: }
5457: closedir(LONIDS);
5458: }
5459: my $userloadpercent=0;
5460: my $maxuserload=$perlvar{'lonUserLoadLim'};
5461: if ($maxuserload) {
1.129 albertel 5462: $userloadpercent=100*$numusers/$maxuserload;
1.127 albertel 5463: }
1.130 albertel 5464: $userloadpercent=sprintf("%.2f",$userloadpercent);
1.127 albertel 5465: return $userloadpercent;
1.91 albertel 5466: }
5467:
1.205 raeburn 5468: # Routines for serializing arrays and hashes (copies from lonnet)
5469:
5470: sub array2str {
5471: my (@array) = @_;
5472: my $result=&arrayref2str(\@array);
5473: $result=~s/^__ARRAY_REF__//;
5474: $result=~s/__END_ARRAY_REF__$//;
5475: return $result;
5476: }
5477:
5478: sub arrayref2str {
5479: my ($arrayref) = @_;
5480: my $result='__ARRAY_REF__';
5481: foreach my $elem (@$arrayref) {
5482: if(ref($elem) eq 'ARRAY') {
5483: $result.=&arrayref2str($elem).'&';
5484: } elsif(ref($elem) eq 'HASH') {
5485: $result.=&hashref2str($elem).'&';
5486: } elsif(ref($elem)) {
5487: #print("Got a ref of ".(ref($elem))." skipping.");
5488: } else {
5489: $result.=&escape($elem).'&';
5490: }
5491: }
5492: $result=~s/\&$//;
5493: $result .= '__END_ARRAY_REF__';
5494: return $result;
5495: }
5496:
5497: sub hash2str {
5498: my (%hash) = @_;
5499: my $result=&hashref2str(\%hash);
5500: $result=~s/^__HASH_REF__//;
5501: $result=~s/__END_HASH_REF__$//;
5502: return $result;
5503: }
5504:
5505: sub hashref2str {
5506: my ($hashref)=@_;
5507: my $result='__HASH_REF__';
5508: foreach (sort(keys(%$hashref))) {
5509: if (ref($_) eq 'ARRAY') {
5510: $result.=&arrayref2str($_).'=';
5511: } elsif (ref($_) eq 'HASH') {
5512: $result.=&hashref2str($_).'=';
5513: } elsif (ref($_)) {
5514: $result.='=';
5515: #print("Got a ref of ".(ref($_))." skipping.");
5516: } else {
5517: if ($_) {$result.=&escape($_).'=';} else { last; }
5518: }
5519:
5520: if(ref($hashref->{$_}) eq 'ARRAY') {
5521: $result.=&arrayref2str($hashref->{$_}).'&';
5522: } elsif(ref($hashref->{$_}) eq 'HASH') {
5523: $result.=&hashref2str($hashref->{$_}).'&';
5524: } elsif(ref($hashref->{$_})) {
5525: $result.='&';
5526: #print("Got a ref of ".(ref($hashref->{$_}))." skipping.");
5527: } else {
5528: $result.=&escape($hashref->{$_}).'&';
5529: }
5530: }
5531: $result=~s/\&$//;
5532: $result .= '__END_HASH_REF__';
5533: return $result;
5534: }
1.200 matthew 5535:
1.61 harris41 5536: # ----------------------------------- POD (plain old documentation, CPAN style)
5537:
5538: =head1 NAME
5539:
5540: lond - "LON Daemon" Server (port "LOND" 5663)
5541:
5542: =head1 SYNOPSIS
5543:
1.74 harris41 5544: Usage: B<lond>
5545:
5546: Should only be run as user=www. This is a command-line script which
5547: is invoked by B<loncron>. There is no expectation that a typical user
5548: will manually start B<lond> from the command-line. (In other words,
5549: DO NOT START B<lond> YOURSELF.)
1.61 harris41 5550:
5551: =head1 DESCRIPTION
5552:
1.74 harris41 5553: There are two characteristics associated with the running of B<lond>,
5554: PROCESS MANAGEMENT (starting, stopping, handling child processes)
5555: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
5556: subscriptions, etc). These are described in two large
5557: sections below.
5558:
5559: B<PROCESS MANAGEMENT>
5560:
1.61 harris41 5561: Preforker - server who forks first. Runs as a daemon. HUPs.
5562: Uses IDEA encryption
5563:
1.74 harris41 5564: B<lond> forks off children processes that correspond to the other servers
5565: in the network. Management of these processes can be done at the
5566: parent process level or the child process level.
5567:
5568: B<logs/lond.log> is the location of log messages.
5569:
5570: The process management is now explained in terms of linux shell commands,
5571: subroutines internal to this code, and signal assignments:
5572:
5573: =over 4
5574:
5575: =item *
5576:
5577: PID is stored in B<logs/lond.pid>
5578:
5579: This is the process id number of the parent B<lond> process.
5580:
5581: =item *
5582:
5583: SIGTERM and SIGINT
5584:
5585: Parent signal assignment:
5586: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
5587:
5588: Child signal assignment:
5589: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
5590: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
5591: to restart a new child.)
5592:
5593: Command-line invocations:
5594: B<kill> B<-s> SIGTERM I<PID>
5595: B<kill> B<-s> SIGINT I<PID>
5596:
5597: Subroutine B<HUNTSMAN>:
5598: This is only invoked for the B<lond> parent I<PID>.
5599: This kills all the children, and then the parent.
5600: The B<lonc.pid> file is cleared.
5601:
5602: =item *
5603:
5604: SIGHUP
5605:
5606: Current bug:
5607: This signal can only be processed the first time
5608: on the parent process. Subsequent SIGHUP signals
5609: have no effect.
5610:
5611: Parent signal assignment:
5612: $SIG{HUP} = \&HUPSMAN;
5613:
5614: Child signal assignment:
5615: none (nothing happens)
5616:
5617: Command-line invocations:
5618: B<kill> B<-s> SIGHUP I<PID>
5619:
5620: Subroutine B<HUPSMAN>:
5621: This is only invoked for the B<lond> parent I<PID>,
5622: This kills all the children, and then the parent.
5623: The B<lond.pid> file is cleared.
5624:
5625: =item *
5626:
5627: SIGUSR1
5628:
5629: Parent signal assignment:
5630: $SIG{USR1} = \&USRMAN;
5631:
5632: Child signal assignment:
5633: $SIG{USR1}= \&logstatus;
5634:
5635: Command-line invocations:
5636: B<kill> B<-s> SIGUSR1 I<PID>
5637:
5638: Subroutine B<USRMAN>:
5639: When invoked for the B<lond> parent I<PID>,
5640: SIGUSR1 is sent to all the children, and the status of
5641: each connection is logged.
1.144 foxr 5642:
5643: =item *
5644:
5645: SIGUSR2
5646:
5647: Parent Signal assignment:
5648: $SIG{USR2} = \&UpdateHosts
5649:
5650: Child signal assignment:
5651: NONE
5652:
1.74 harris41 5653:
5654: =item *
5655:
5656: SIGCHLD
5657:
5658: Parent signal assignment:
5659: $SIG{CHLD} = \&REAPER;
5660:
5661: Child signal assignment:
5662: none
5663:
5664: Command-line invocations:
5665: B<kill> B<-s> SIGCHLD I<PID>
5666:
5667: Subroutine B<REAPER>:
5668: This is only invoked for the B<lond> parent I<PID>.
5669: Information pertaining to the child is removed.
5670: The socket port is cleaned up.
5671:
5672: =back
5673:
5674: B<SERVER-SIDE ACTIVITIES>
5675:
5676: Server-side information can be accepted in an encrypted or non-encrypted
5677: method.
5678:
5679: =over 4
5680:
5681: =item ping
5682:
5683: Query a client in the hosts.tab table; "Are you there?"
5684:
5685: =item pong
5686:
5687: Respond to a ping query.
5688:
5689: =item ekey
5690:
5691: Read in encrypted key, make cipher. Respond with a buildkey.
5692:
5693: =item load
5694:
5695: Respond with CPU load based on a computation upon /proc/loadavg.
5696:
5697: =item currentauth
5698:
5699: Reply with current authentication information (only over an
5700: encrypted channel).
5701:
5702: =item auth
5703:
5704: Only over an encrypted channel, reply as to whether a user's
5705: authentication information can be validated.
5706:
5707: =item passwd
5708:
5709: Allow for a password to be set.
5710:
5711: =item makeuser
5712:
5713: Make a user.
5714:
5715: =item passwd
5716:
5717: Allow for authentication mechanism and password to be changed.
5718:
5719: =item home
1.61 harris41 5720:
1.74 harris41 5721: Respond to a question "are you the home for a given user?"
5722:
5723: =item update
5724:
5725: Update contents of a subscribed resource.
5726:
5727: =item unsubscribe
5728:
5729: The server is unsubscribing from a resource.
5730:
5731: =item subscribe
5732:
5733: The server is subscribing to a resource.
5734:
5735: =item log
5736:
5737: Place in B<logs/lond.log>
5738:
5739: =item put
5740:
5741: stores hash in namespace
5742:
1.230 foxr 5743: =item rolesputy
1.74 harris41 5744:
5745: put a role into a user's environment
5746:
5747: =item get
5748:
5749: returns hash with keys from array
5750: reference filled in from namespace
5751:
5752: =item eget
5753:
5754: returns hash with keys from array
5755: reference filled in from namesp (encrypts the return communication)
5756:
5757: =item rolesget
5758:
5759: get a role from a user's environment
5760:
5761: =item del
5762:
5763: deletes keys out of array from namespace
5764:
5765: =item keys
5766:
5767: returns namespace keys
5768:
5769: =item dump
5770:
5771: dumps the complete (or key matching regexp) namespace into a hash
5772:
5773: =item store
5774:
5775: stores hash permanently
5776: for this url; hashref needs to be given and should be a \%hashname; the
5777: remaining args aren't required and if they aren't passed or are '' they will
5778: be derived from the ENV
5779:
5780: =item restore
5781:
5782: returns a hash for a given url
5783:
5784: =item querysend
5785:
5786: Tells client about the lonsql process that has been launched in response
5787: to a sent query.
5788:
5789: =item queryreply
5790:
5791: Accept information from lonsql and make appropriate storage in temporary
5792: file space.
5793:
5794: =item idput
5795:
5796: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
5797: for each student, defined perhaps by the institutional Registrar.)
5798:
5799: =item idget
5800:
5801: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
5802: for each student, defined perhaps by the institutional Registrar.)
5803:
5804: =item tmpput
5805:
5806: Accept and store information in temporary space.
5807:
5808: =item tmpget
5809:
5810: Send along temporarily stored information.
5811:
5812: =item ls
5813:
5814: List part of a user's directory.
5815:
1.135 foxr 5816: =item pushtable
5817:
5818: Pushes a file in /home/httpd/lonTab directory. Currently limited to:
5819: hosts.tab and domain.tab. The old file is copied to *.tab.backup but
5820: must be restored manually in case of a problem with the new table file.
5821: pushtable requires that the request be encrypted and validated via
5822: ValidateManager. The form of the command is:
5823: enc:pushtable tablename <tablecontents> \n
5824: where pushtable, tablename and <tablecontents> will be encrypted, but \n is a
5825: cleartext newline.
5826:
1.74 harris41 5827: =item Hanging up (exit or init)
5828:
5829: What to do when a client tells the server that they (the client)
5830: are leaving the network.
5831:
5832: =item unknown command
5833:
5834: If B<lond> is sent an unknown command (not in the list above),
5835: it replys to the client "unknown_cmd".
1.135 foxr 5836:
1.74 harris41 5837:
5838: =item UNKNOWN CLIENT
5839:
5840: If the anti-spoofing algorithm cannot verify the client,
5841: the client is rejected (with a "refused" message sent
5842: to the client, and the connection is closed.
5843:
5844: =back
1.61 harris41 5845:
5846: =head1 PREREQUISITES
5847:
5848: IO::Socket
5849: IO::File
5850: Apache::File
5851: Symbol
5852: POSIX
5853: Crypt::IDEA
5854: LWP::UserAgent()
5855: GDBM_File
5856: Authen::Krb4
1.91 albertel 5857: Authen::Krb5
1.61 harris41 5858:
5859: =head1 COREQUISITES
5860:
5861: =head1 OSNAMES
5862:
5863: linux
5864:
5865: =head1 SCRIPT CATEGORIES
5866:
5867: Server/Process
5868:
5869: =cut
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