1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.77 2002/04/27 13:10:47 foxr Exp $
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29: # 5/26/99,6/4,6/10,6/11,6/14,6/15,6/26,6/28,6/30,
30: # 7/8,7/9,7/10,7/12,7/17,7/19,9/21,
31: # 10/7,10/8,10/9,10/11,10/13,10/15,11/4,11/16,
32: # 12/7,12/15,01/06,01/11,01/12,01/14,2/8,
33: # 03/07,05/31 Gerd Kortemeyer
34: # 06/26 Scott Harrison
35: # 06/29,06/30,07/14,07/15,07/17,07/20,07/25,09/18 Gerd Kortemeyer
36: # 12/05 Scott Harrison
37: # 12/05,12/13,12/29 Gerd Kortemeyer
38: # YEAR=2001
39: # Jan 01 Scott Harrison
40: # 02/12 Gerd Kortemeyer
41: # 03/15 Scott Harrison
42: # 03/24 Gerd Kortemeyer
43: # 04/02 Scott Harrison
44: # 05/11,05/28,08/30 Gerd Kortemeyer
45: # 9/30,10/22,11/13,11/15,11/16 Scott Harrison
46: # 11/26,11/27 Gerd Kortemeyer
47: # 12/20 Scott Harrison
48: # 12/22 Gerd Kortemeyer
49: # YEAR=2002
50: # 01/20/02,02/05 Gerd Kortemeyer
51: # 02/05 Guy Albertelli
52: # 02/07 Scott Harrison
53: # 02/12 Gerd Kortemeyer
54: # 02/19 Matthew Hall
55: # 02/25 Gerd Kortemeyer
56: ###
57:
58: # based on "Perl Cookbook" ISBN 1-56592-243-3
59: # preforker - server who forks first
60: # runs as a daemon
61: # HUPs
62: # uses IDEA encryption
63:
64: use IO::Socket;
65: use IO::File;
66: use Apache::File;
67: use Symbol;
68: use POSIX;
69: use Crypt::IDEA;
70: use LWP::UserAgent();
71: use GDBM_File;
72: use Authen::Krb4;
73: use lib '/home/httpd/lib/perl/';
74: use localauth;
75:
76: my $DEBUG = 0; # Non zero to enable debug log entries.
77:
78: my $status='';
79: my $lastlog='';
80:
81: # grabs exception and records it to log before exiting
82: sub catchexception {
83: my ($error)=@_;
84: $SIG{'QUIT'}='DEFAULT';
85: $SIG{__DIE__}='DEFAULT';
86: &logthis("<font color=red>CRITICAL: "
87: ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
88: ."a crash with this error msg->[$error]</font>");
89: &logthis('Famous last words: '.$status.' - '.$lastlog);
90: if ($client) { print $client "error: $error\n"; }
91: $server->close();
92: die($error);
93: }
94:
95: sub timeout {
96: &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
97: &catchexception('Timeout');
98: }
99: # -------------------------------- Set signal handlers to record abnormal exits
100:
101: $SIG{'QUIT'}=\&catchexception;
102: $SIG{__DIE__}=\&catchexception;
103:
104: # ------------------------------------ Read httpd access.conf and get variables
105:
106: open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
107:
108: while ($configline=<CONFIG>) {
109: if ($configline =~ /PerlSetVar/) {
110: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
111: chomp($varvalue);
112: $perlvar{$varname}=$varvalue;
113: }
114: }
115: close(CONFIG);
116:
117: # ----------------------------- Make sure this process is running from user=www
118: my $wwwid=getpwnam('www');
119: if ($wwwid!=$<) {
120: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
121: $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
122: system("echo 'User ID mismatch. lond must be run as user www.' |\
123: mailto $emailto -s '$subj' > /dev/null");
124: exit 1;
125: }
126:
127: # --------------------------------------------- Check if other instance running
128:
129: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
130:
131: if (-e $pidfile) {
132: my $lfh=IO::File->new("$pidfile");
133: my $pide=<$lfh>;
134: chomp($pide);
135: if (kill 0 => $pide) { die "already running"; }
136: }
137:
138: $PREFORK=4; # number of children to maintain, at least four spare
139:
140: # ------------------------------------------------------------- Read hosts file
141:
142: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
143:
144: while ($configline=<CONFIG>) {
145: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
146: chomp($ip); $ip=~s/\D+$//;
147: $hostid{$ip}=$id;
148: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
149: $PREFORK++;
150: }
151: close(CONFIG);
152:
153: # establish SERVER socket, bind and listen.
154: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
155: Type => SOCK_STREAM,
156: Proto => 'tcp',
157: Reuse => 1,
158: Listen => 10 )
159: or die "making socket: $@\n";
160:
161: # --------------------------------------------------------- Do global variables
162:
163: # global variables
164:
165: $MAX_CLIENTS_PER_CHILD = 50; # number of clients each child should
166: # process
167: %children = (); # keys are current child process IDs
168: $children = 0; # current number of children
169:
170: sub REAPER { # takes care of dead children
171: $SIG{CHLD} = \&REAPER;
172: my $pid = wait;
173: if (defined($children{$pid})) {
174: &logthis("Child $pid died");
175: $children --;
176: delete $children{$pid};
177: } else {
178: &logthis("Unknown Child $pid died");
179: }
180: }
181:
182: sub HUNTSMAN { # signal handler for SIGINT
183: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
184: kill 'INT' => keys %children;
185: &logthis("Free socket: ".shutdown($server,2)); # free up socket
186: my $execdir=$perlvar{'lonDaemons'};
187: unlink("$execdir/logs/lond.pid");
188: &logthis("<font color=red>CRITICAL: Shutting down</font>");
189: exit; # clean up with dignity
190: }
191:
192: sub HUPSMAN { # signal handler for SIGHUP
193: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
194: kill 'INT' => keys %children;
195: &logthis("Free socket: ".shutdown($server,2)); # free up socket
196: &logthis("<font color=red>CRITICAL: Restarting</font>");
197: unlink("$execdir/logs/lond.pid");
198: my $execdir=$perlvar{'lonDaemons'};
199: exec("$execdir/lond"); # here we go again
200: }
201:
202: sub checkchildren {
203: &initnewstatus();
204: &logstatus();
205: &logthis('Going to check on the children');
206: $docdir=$perlvar{'lonDocRoot'};
207: foreach (sort keys %children) {
208: sleep 1;
209: unless (kill 'USR1' => $_) {
210: &logthis ('Child '.$_.' is dead');
211: &logstatus($$.' is dead');
212: }
213: }
214: sleep 5;
215: foreach (sort keys %children) {
216: unless (-e "$docdir/lon-status/londchld/$_.txt") {
217: &logthis('Child '.$_.' did not respond');
218: kill 9 => $_;
219: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
220: $subj="LON: $perlvar{'lonHostID'} killed lond process $_";
221: my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
222: $execdir=$perlvar{'lonDaemons'};
223: $result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`
224: }
225: }
226: }
227:
228: # --------------------------------------------------------------------- Logging
229:
230: sub logthis {
231: my $message=shift;
232: my $execdir=$perlvar{'lonDaemons'};
233: my $fh=IO::File->new(">>$execdir/logs/lond.log");
234: my $now=time;
235: my $local=localtime($now);
236: $lastlog=$local.': '.$message;
237: print $fh "$local ($$): $message\n";
238: }
239:
240: # ------------------------- Conditional log if $DEBUG true.
241: sub Debug {
242: my $message = shift;
243: if($DEBUG) {
244: &logthis($message);
245: }
246: }
247: # ------------------------------------------------------------------ Log status
248:
249: sub logstatus {
250: my $docdir=$perlvar{'lonDocRoot'};
251: {
252: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
253: print $fh $$."\t".$status."\t".$lastlog."\n";
254: $fh->close();
255: }
256: {
257: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
258: print $fh $status."\n".$lastlog."\n".time;
259: $fh->close();
260: }
261: }
262:
263: sub initnewstatus {
264: my $docdir=$perlvar{'lonDocRoot'};
265: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
266: my $now=time;
267: my $local=localtime($now);
268: print $fh "LOND status $local - parent $$\n\n";
269: opendir(DIR,"$docdir/lon-status/londchld");
270: while ($filename=readdir(DIR)) {
271: unlink("$docdir/lon-status/londchld/$filename");
272: }
273: closedir(DIR);
274: }
275:
276: # -------------------------------------------------------------- Status setting
277:
278: sub status {
279: my $what=shift;
280: my $now=time;
281: my $local=localtime($now);
282: $status=$local.': '.$what;
283: }
284:
285: # -------------------------------------------------------- Escape Special Chars
286:
287: sub escape {
288: my $str=shift;
289: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
290: return $str;
291: }
292:
293: # ----------------------------------------------------- Un-Escape Special Chars
294:
295: sub unescape {
296: my $str=shift;
297: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
298: return $str;
299: }
300:
301: # ----------------------------------------------------------- Send USR1 to lonc
302:
303: sub reconlonc {
304: my $peerfile=shift;
305: &logthis("Trying to reconnect for $peerfile");
306: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
307: if (my $fh=IO::File->new("$loncfile")) {
308: my $loncpid=<$fh>;
309: chomp($loncpid);
310: if (kill 0 => $loncpid) {
311: &logthis("lonc at pid $loncpid responding, sending USR1");
312: kill USR1 => $loncpid;
313: sleep 5;
314: if (-e "$peerfile") { return; }
315: &logthis("$peerfile still not there, give it another try");
316: sleep 10;
317: if (-e "$peerfile") { return; }
318: &logthis(
319: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
320: } else {
321: &logthis(
322: "<font color=red>CRITICAL: "
323: ."lonc at pid $loncpid not responding, giving up</font>");
324: }
325: } else {
326: &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
327: }
328: }
329:
330: # -------------------------------------------------- Non-critical communication
331:
332: sub subreply {
333: my ($cmd,$server)=@_;
334: my $peerfile="$perlvar{'lonSockDir'}/$server";
335: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
336: Type => SOCK_STREAM,
337: Timeout => 10)
338: or return "con_lost";
339: print $sclient "$cmd\n";
340: my $answer=<$sclient>;
341: chomp($answer);
342: if (!$answer) { $answer="con_lost"; }
343: return $answer;
344: }
345:
346: sub reply {
347: my ($cmd,$server)=@_;
348: my $answer;
349: if ($server ne $perlvar{'lonHostID'}) {
350: $answer=subreply($cmd,$server);
351: if ($answer eq 'con_lost') {
352: $answer=subreply("ping",$server);
353: if ($answer ne $server) {
354: &logthis("sub reply: answer != server");
355: &reconlonc("$perlvar{'lonSockDir'}/$server");
356: }
357: $answer=subreply($cmd,$server);
358: }
359: } else {
360: $answer='self_reply';
361: }
362: return $answer;
363: }
364:
365: # -------------------------------------------------------------- Talk to lonsql
366:
367: sub sqlreply {
368: my ($cmd)=@_;
369: my $answer=subsqlreply($cmd);
370: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
371: return $answer;
372: }
373:
374: sub subsqlreply {
375: my ($cmd)=@_;
376: my $unixsock="mysqlsock";
377: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
378: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
379: Type => SOCK_STREAM,
380: Timeout => 10)
381: or return "con_lost";
382: print $sclient "$cmd\n";
383: my $answer=<$sclient>;
384: chomp($answer);
385: if (!$answer) { $answer="con_lost"; }
386: return $answer;
387: }
388:
389: # -------------------------------------------- Return path to profile directory
390:
391: sub propath {
392: my ($udom,$uname)=@_;
393: $udom=~s/\W//g;
394: $uname=~s/\W//g;
395: my $subdir=$uname.'__';
396: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
397: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
398: return $proname;
399: }
400:
401: # --------------------------------------- Is this the home server of an author?
402:
403: sub ishome {
404: my $author=shift;
405: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
406: my ($udom,$uname)=split(/\//,$author);
407: my $proname=propath($udom,$uname);
408: if (-e $proname) {
409: return 'owner';
410: } else {
411: return 'not_owner';
412: }
413: }
414:
415: # ======================================================= Continue main program
416: # ---------------------------------------------------- Fork once and dissociate
417:
418: $fpid=fork;
419: exit if $fpid;
420: die "Couldn't fork: $!" unless defined ($fpid);
421:
422: POSIX::setsid() or die "Can't start new session: $!";
423:
424: # ------------------------------------------------------- Write our PID on disk
425:
426: $execdir=$perlvar{'lonDaemons'};
427: open (PIDSAVE,">$execdir/logs/lond.pid");
428: print PIDSAVE "$$\n";
429: close(PIDSAVE);
430: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
431: &status('Starting');
432:
433: # ------------------------------------------------------- Now we are on our own
434:
435: # Fork off our children.
436: for (1 .. $PREFORK) {
437: make_new_child();
438: }
439:
440: # ----------------------------------------------------- Install signal handlers
441:
442: &status('Forked children');
443:
444: $SIG{CHLD} = \&REAPER;
445: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
446: $SIG{HUP} = \&HUPSMAN;
447: $SIG{USR1} = \&checkchildren;
448:
449: # And maintain the population.
450: while (1) {
451: &status('Sleeping');
452: sleep; # wait for a signal (i.e., child's death)
453: &logthis('Woke up');
454: &status('Woke up');
455: for ($i = $children; $i < $PREFORK; $i++) {
456: make_new_child(); # top up the child pool
457: }
458: }
459:
460: sub make_new_child {
461: my $pid;
462: my $cipher;
463: my $sigset;
464: &logthis("Attempting to start child");
465: # block signal for fork
466: $sigset = POSIX::SigSet->new(SIGINT);
467: sigprocmask(SIG_BLOCK, $sigset)
468: or die "Can't block SIGINT for fork: $!\n";
469:
470: die "fork: $!" unless defined ($pid = fork);
471:
472: if ($pid) {
473: # Parent records the child's birth and returns.
474: sigprocmask(SIG_UNBLOCK, $sigset)
475: or die "Can't unblock SIGINT for fork: $!\n";
476: $children{$pid} = 1;
477: $children++;
478: &status('Started child '.$pid);
479: return;
480: } else {
481: # Child can *not* return from this subroutine.
482: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
483: $SIG{USR1}= \&logstatus;
484: $SIG{ALRM}= \&timeout;
485: $lastlog='Forked ';
486: $status='Forked';
487:
488: # unblock signals
489: sigprocmask(SIG_UNBLOCK, $sigset)
490: or die "Can't unblock SIGINT for fork: $!\n";
491:
492: $tmpsnum=0;
493:
494: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
495: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
496: &status('Idle, waiting for connection');
497: $client = $server->accept() or last;
498: &status('Accepted connection');
499: # =============================================================================
500: # do something with the connection
501: # -----------------------------------------------------------------------------
502: # see if we know client and check for spoof IP by challenge
503: my $caller=getpeername($client);
504: my ($port,$iaddr)=unpack_sockaddr_in($caller);
505: my $clientip=inet_ntoa($iaddr);
506: my $clientrec=($hostid{$clientip} ne undef);
507: &logthis(
508: "<font color=yellow>INFO: Connection $i, $clientip ($hostid{$clientip})</font>"
509: );
510: &status("Connecting $clientip ($hostid{$clientip})");
511: my $clientok;
512: if ($clientrec) {
513: &status("Waiting for init from $clientip ($hostid{$clientip})");
514: my $remotereq=<$client>;
515: $remotereq=~s/\W//g;
516: if ($remotereq eq 'init') {
517: my $challenge="$$".time;
518: print $client "$challenge\n";
519: &status(
520: "Waiting for challenge reply from $clientip ($hostid{$clientip})");
521: $remotereq=<$client>;
522: $remotereq=~s/\W//g;
523: if ($challenge eq $remotereq) {
524: $clientok=1;
525: print $client "ok\n";
526: } else {
527: &logthis(
528: "<font color=blue>WARNING: $clientip did not reply challenge</font>");
529: &status('No challenge reply '.$clientip);
530: }
531: } else {
532: &logthis(
533: "<font color=blue>WARNING: "
534: ."$clientip failed to initialize: >$remotereq< </font>");
535: &status('No init '.$clientip);
536: }
537: } else {
538: &logthis(
539: "<font color=blue>WARNING: Unknown client $clientip</font>");
540: &status('Hung up on '.$clientip);
541: }
542: if ($clientok) {
543: # ---------------- New known client connecting, could mean machine online again
544:
545: &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
546: &logthis(
547: "<font color=green>Established connection: $hostid{$clientip}</font>");
548: &status('Will listen to '.$hostid{$clientip});
549: # ------------------------------------------------------------ Process requests
550: while (my $userinput=<$client>) {
551: chomp($userinput);
552: &status('Processing '.$hostid{$clientip}.': '.$userinput);
553: my $wasenc=0;
554: alarm(120);
555: # ------------------------------------------------------------ See if encrypted
556: if ($userinput =~ /^enc/) {
557: if ($cipher) {
558: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
559: $userinput='';
560: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
561: $userinput.=
562: $cipher->decrypt(
563: pack("H16",substr($encinput,$encidx,16))
564: );
565: }
566: $userinput=substr($userinput,0,$cmdlength);
567: $wasenc=1;
568: }
569: }
570:
571: # ------------------------------------------------------------- Normal commands
572: # ------------------------------------------------------------------------ ping
573: if ($userinput =~ /^ping/) {
574: print $client "$perlvar{'lonHostID'}\n";
575: # ------------------------------------------------------------------------ pong
576: } elsif ($userinput =~ /^pong/) {
577: $reply=reply("ping",$hostid{$clientip});
578: print $client "$perlvar{'lonHostID'}:$reply\n";
579: # ------------------------------------------------------------------------ ekey
580: } elsif ($userinput =~ /^ekey/) {
581: my $buildkey=time.$$.int(rand 100000);
582: $buildkey=~tr/1-6/A-F/;
583: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
584: my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
585: $key=~tr/a-z/A-Z/;
586: $key=~tr/G-P/0-9/;
587: $key=~tr/Q-Z/0-9/;
588: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
589: $key=substr($key,0,32);
590: my $cipherkey=pack("H32",$key);
591: $cipher=new IDEA $cipherkey;
592: print $client "$buildkey\n";
593: # ------------------------------------------------------------------------ load
594: } elsif ($userinput =~ /^load/) {
595: my $loadavg;
596: {
597: my $loadfile=IO::File->new('/proc/loadavg');
598: $loadavg=<$loadfile>;
599: }
600: $loadavg =~ s/\s.*//g;
601: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
602: print $client "$loadpercent\n";
603: # ----------------------------------------------------------------- currentauth
604: } elsif ($userinput =~ /^currentauth/) {
605: if ($wasenc==1) {
606: my ($cmd,$udom,$uname)=split(/:/,$userinput);
607: my $proname=propath($udom,$uname);
608: my $passfilename="$proname/passwd";
609: if (-e $passfilename) {
610: my $pf = IO::File->new($passfilename);
611: my $realpasswd=<$pf>;
612: chomp($realpasswd);
613: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
614: my $availablecontent='';
615: if ($howpwd eq 'krb4') {
616: $availablecontent=$contentpwd;
617: }
618: print $client "$howpwd:$availablecontent\n";
619: } else {
620: print $client "unknown_user\n";
621: }
622: } else {
623: print $client "refused\n";
624: }
625: # ------------------------------------------------------------------------ auth
626: } elsif ($userinput =~ /^auth/) {
627: if ($wasenc==1) {
628: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
629: chomp($upass);
630: $upass=unescape($upass);
631: my $proname=propath($udom,$uname);
632: my $passfilename="$proname/passwd";
633: if (-e $passfilename) {
634: my $pf = IO::File->new($passfilename);
635: my $realpasswd=<$pf>;
636: chomp($realpasswd);
637: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
638: my $pwdcorrect=0;
639: if ($howpwd eq 'internal') {
640: $pwdcorrect=
641: (crypt($upass,$contentpwd) eq $contentpwd);
642: } elsif ($howpwd eq 'unix') {
643: $contentpwd=(getpwnam($uname))[1];
644: my $pwauth_path="/usr/local/sbin/pwauth";
645: unless ($contentpwd eq 'x') {
646: $pwdcorrect=
647: (crypt($upass,$contentpwd) eq $contentpwd);
648: }
649: elsif (-e $pwauth_path) {
650: open PWAUTH, "|$pwauth_path" or
651: die "Cannot invoke authentication";
652: print PWAUTH "$uname\n$upass\n";
653: close PWAUTH;
654: $pwdcorrect=!$?;
655: }
656: } elsif ($howpwd eq 'krb4') {
657: $null=pack("C",0);
658: unless ($upass=~/$null/) {
659: $pwdcorrect=(
660: Authen::Krb4::get_pw_in_tkt($uname,"",
661: $contentpwd,'krbtgt',$contentpwd,1,
662: $upass) == 0);
663: } else { $pwdcorrect=0; }
664: } elsif ($howpwd eq 'localauth') {
665: $pwdcorrect=&localauth::localauth($uname,$upass,
666: $contentpwd);
667: }
668: if ($pwdcorrect) {
669: print $client "authorized\n";
670: } else {
671: print $client "non_authorized\n";
672: }
673: } else {
674: print $client "unknown_user\n";
675: }
676: } else {
677: print $client "refused\n";
678: }
679: # ---------------------------------------------------------------------- passwd
680: } elsif ($userinput =~ /^passwd/) {
681: if ($wasenc==1) {
682: my
683: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
684: chomp($npass);
685: $upass=&unescape($upass);
686: $npass=&unescape($npass);
687: &logthis("Trying to change password for $uname");
688: my $proname=propath($udom,$uname);
689: my $passfilename="$proname/passwd";
690: if (-e $passfilename) {
691: my $realpasswd;
692: { my $pf = IO::File->new($passfilename);
693: $realpasswd=<$pf>; }
694: chomp($realpasswd);
695: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
696: if ($howpwd eq 'internal') {
697: if (crypt($upass,$contentpwd) eq $contentpwd) {
698: my $salt=time;
699: $salt=substr($salt,6,2);
700: my $ncpass=crypt($npass,$salt);
701: { my $pf = IO::File->new(">$passfilename");
702: print $pf "internal:$ncpass\n"; }
703: &logthis("Result of password change for $uname: pwchange_success");
704: print $client "ok\n";
705: } else {
706: print $client "non_authorized\n";
707: }
708: } elsif ($howpwd eq 'unix') {
709: # Unix means we have to access /etc/password
710: # one way or another.
711: # First: Make sure the current password is
712: # correct
713: $contentpwd=(getpwnam($uname))[1];
714: my $pwdcorrect = "0";
715: my $pwauth_path="/usr/local/sbin/pwauth";
716: unless ($contentpwd eq 'x') {
717: $pwdcorrect=
718: (crypt($upass,$contentpwd) eq $contentpwd);
719: } elsif (-e $pwauth_path) {
720: open PWAUTH, "|$pwauth_path" or
721: die "Cannot invoke authentication";
722: print PWAUTH "$uname\n$upass\n";
723: close PWAUTH;
724: $pwdcorrect=!$?;
725: }
726: if ($pwdcorrect) {
727: my $execdir=$perlvar{'lonDaemons'};
728: my $pf = IO::File->new("|$execdir/lcpasswd");
729: print $pf "$uname\n$npass\n$npass\n";
730: close $pf;
731: my $result = ($?>0 ? 'pwchange_failure'
732: : 'ok');
733: &logthis("Result of password change for $uname: $result");
734: print $client "$result\n";
735: } else {
736: print $client "non_authorized\n";
737: }
738: } else {
739: print $client "auth_mode_error\n";
740: }
741: } else {
742: print $client "unknown_user\n";
743: }
744: } else {
745: print $client "refused\n";
746: }
747: # -------------------------------------------------------------------- makeuser
748: } elsif ($userinput =~ /^makeuser/) {
749: Debug("Make user received");
750: my $oldumask=umask(0077);
751: if ($wasenc==1) {
752: my
753: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
754: &Debug("cmd =".$cmd." $udom =".$udom.
755: " uname=".$uname);
756: chomp($npass);
757: $npass=&unescape($npass);
758: my $proname=propath($udom,$uname);
759: my $passfilename="$proname/passwd";
760: &Debug("Password file created will be:".
761: $passfilename);
762: if (-e $passfilename) {
763: print $client "already_exists\n";
764: } elsif ($udom ne $perlvar{'lonDefDomain'}) {
765: print $client "not_right_domain\n";
766: } else {
767: @fpparts=split(/\//,$proname);
768: $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
769: $fperror='';
770: for ($i=3;$i<=$#fpparts;$i++) {
771: $fpnow.='/'.$fpparts[$i];
772: unless (-e $fpnow) {
773: unless (mkdir($fpnow,0777)) {
774: $fperror="error:$!";
775: }
776: }
777: }
778: unless ($fperror) {
779: if ($umode eq 'krb4') {
780: {
781: my $pf = IO::File->new(">$passfilename");
782: print $pf "krb4:$npass\n";
783: }
784: print $client "ok\n";
785: } elsif ($umode eq 'internal') {
786: my $salt=time;
787: $salt=substr($salt,6,2);
788: my $ncpass=crypt($npass,$salt);
789: {
790: &Debug("Creating internal auth");
791: my $pf = IO::File->new(">$passfilename");
792: print $pf "internal:$ncpass\n";
793: }
794: print $client "ok\n";
795: } elsif ($umode eq 'localauth') {
796: {
797: my $pf = IO::File->new(">$passfilename");
798: print $pf "localauth:$npass\n";
799: }
800: print $client "ok\n";
801: } elsif ($umode eq 'unix') {
802: {
803: my $execpath="$perlvar{'lonDaemons'}/".
804: "lcuseradd";
805: {
806: &Debug("Executing external: ".
807: $execpath);
808: my $se = IO::File->new("|$execpath");
809: print $se "$uname\n";
810: print $se "$npass\n";
811: print $se "$npass\n";
812: }
813: my $pf = IO::File->new(">$passfilename");
814: print $pf "unix:\n";
815: }
816: print $client "ok\n";
817: } elsif ($umode eq 'none') {
818: {
819: my $pf = IO::File->new(">$passfilename");
820: print $pf "none:\n";
821: }
822: print $client "ok\n";
823: } else {
824: print $client "auth_mode_error\n";
825: }
826: } else {
827: print $client "$fperror\n";
828: }
829: }
830: } else {
831: print $client "refused\n";
832: }
833: umask($oldumask);
834: # -------------------------------------------------------------- changeuserauth
835: } elsif ($userinput =~ /^changeuserauth/) {
836: &Debug("Changing authorization");
837: if ($wasenc==1) {
838: my
839: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
840: chomp($npass);
841: &Debug("cmd = ".$cmd." domain= ".$udom.
842: "uname =".$uname." umode= ".$umode);
843: $npass=&unescape($npass);
844: my $proname=propath($udom,$uname);
845: my $passfilename="$proname/passwd";
846: if ($udom ne $perlvar{'lonDefDomain'}) {
847: print $client "not_right_domain\n";
848: } else {
849: if ($umode eq 'krb4') {
850: {
851: my $pf = IO::File->new(">$passfilename");
852: print $pf "krb4:$npass\n";
853: }
854: print $client "ok\n";
855: } elsif ($umode eq 'internal') {
856: my $salt=time;
857: $salt=substr($salt,6,2);
858: my $ncpass=crypt($npass,$salt);
859: {
860: my $pf = IO::File->new(">$passfilename");
861: print $pf "internal:$ncpass\n";
862: }
863: print $client "ok\n";
864: } elsif ($umode eq 'localauth') {
865: {
866: my $pf = IO::File->new(">$passfilename");
867: print $pf "localauth:$npass\n";
868: }
869: print $client "ok\n";
870: } elsif ($umode eq 'unix') {
871: {
872: my $execpath="$perlvar{'lonDaemons'}/".
873: "lcuseradd";
874: {
875: my $se = IO::File->new("|$execpath");
876: print $se "$uname\n";
877: print $se "$npass\n";
878: print $se "$npass\n";
879: }
880: my $pf = IO::File->new(">$passfilename");
881: print $pf "unix:\n";
882: }
883: print $client "ok\n";
884: } elsif ($umode eq 'none') {
885: {
886: my $pf = IO::File->new(">$passfilename");
887: print $pf "none:\n";
888: }
889: print $client "ok\n";
890: } else {
891: print $client "auth_mode_error\n";
892: }
893: }
894: } else {
895: print $client "refused\n";
896: }
897: # ------------------------------------------------------------------------ home
898: } elsif ($userinput =~ /^home/) {
899: my ($cmd,$udom,$uname)=split(/:/,$userinput);
900: chomp($uname);
901: my $proname=propath($udom,$uname);
902: if (-e $proname) {
903: print $client "found\n";
904: } else {
905: print $client "not_found\n";
906: }
907: # ---------------------------------------------------------------------- update
908: } elsif ($userinput =~ /^update/) {
909: my ($cmd,$fname)=split(/:/,$userinput);
910: my $ownership=ishome($fname);
911: if ($ownership eq 'not_owner') {
912: if (-e $fname) {
913: my ($dev,$ino,$mode,$nlink,
914: $uid,$gid,$rdev,$size,
915: $atime,$mtime,$ctime,
916: $blksize,$blocks)=stat($fname);
917: $now=time;
918: $since=$now-$atime;
919: if ($since>$perlvar{'lonExpire'}) {
920: $reply=
921: reply("unsub:$fname","$hostid{$clientip}");
922: unlink("$fname");
923: } else {
924: my $transname="$fname.in.transfer";
925: my $remoteurl=
926: reply("sub:$fname","$hostid{$clientip}");
927: my $response;
928: {
929: my $ua=new LWP::UserAgent;
930: my $request=new HTTP::Request('GET',"$remoteurl");
931: $response=$ua->request($request,$transname);
932: }
933: if ($response->is_error()) {
934: unlink($transname);
935: my $message=$response->status_line;
936: &logthis(
937: "LWP GET: $message for $fname ($remoteurl)");
938: } else {
939: if ($remoteurl!~/\.meta$/) {
940: my $ua=new LWP::UserAgent;
941: my $mrequest=
942: new HTTP::Request('GET',$remoteurl.'.meta');
943: my $mresponse=
944: $ua->request($mrequest,$fname.'.meta');
945: if ($mresponse->is_error()) {
946: unlink($fname.'.meta');
947: }
948: }
949: rename($transname,$fname);
950: }
951: }
952: print $client "ok\n";
953: } else {
954: print $client "not_found\n";
955: }
956: } else {
957: print $client "rejected\n";
958: }
959: # ----------------------------------------------------------------- unsubscribe
960: } elsif ($userinput =~ /^unsub/) {
961: my ($cmd,$fname)=split(/:/,$userinput);
962: if (-e $fname) {
963: if (unlink("$fname.$hostid{$clientip}")) {
964: print $client "ok\n";
965: } else {
966: print $client "not_subscribed\n";
967: }
968: } else {
969: print $client "not_found\n";
970: }
971: # ------------------------------------------------------------------- subscribe
972: } elsif ($userinput =~ /^sub/) {
973: my ($cmd,$fname)=split(/:/,$userinput);
974: my $ownership=ishome($fname);
975: if ($ownership eq 'owner') {
976: if (-e $fname) {
977: if (-d $fname) {
978: print $client "directory\n";
979: } else {
980: $now=time;
981: {
982: my $sh;
983: if ($sh=
984: IO::File->new(">$fname.$hostid{$clientip}")) {
985: print $sh "$clientip:$now\n";
986: }
987: }
988: unless ($fname=~/\.meta$/) {
989: unlink("$fname.meta.$hostid{$clientip}");
990: }
991: $fname=~s/\/home\/httpd\/html\/res/raw/;
992: $fname="http://$thisserver/".$fname;
993: print $client "$fname\n";
994: }
995: } else {
996: print $client "not_found\n";
997: }
998: } else {
999: print $client "rejected\n";
1000: }
1001: # ------------------------------------------------------------------------- log
1002: } elsif ($userinput =~ /^log/) {
1003: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
1004: chomp($what);
1005: my $proname=propath($udom,$uname);
1006: my $now=time;
1007: {
1008: my $hfh;
1009: if ($hfh=IO::File->new(">>$proname/activity.log")) {
1010: print $hfh "$now:$hostid{$clientip}:$what\n";
1011: print $client "ok\n";
1012: } else {
1013: print $client "error:$!\n";
1014: }
1015: }
1016: # ------------------------------------------------------------------------- put
1017: } elsif ($userinput =~ /^put/) {
1018: my ($cmd,$udom,$uname,$namespace,$what)
1019: =split(/:/,$userinput);
1020: $namespace=~s/\//\_/g;
1021: $namespace=~s/\W//g;
1022: if ($namespace ne 'roles') {
1023: chomp($what);
1024: my $proname=propath($udom,$uname);
1025: my $now=time;
1026: unless ($namespace=~/^nohist\_/) {
1027: my $hfh;
1028: if (
1029: $hfh=IO::File->new(">>$proname/$namespace.hist")
1030: ) { print $hfh "P:$now:$what\n"; }
1031: }
1032: my @pairs=split(/\&/,$what);
1033: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1034: foreach $pair (@pairs) {
1035: ($key,$value)=split(/=/,$pair);
1036: $hash{$key}=$value;
1037: }
1038: if (untie(%hash)) {
1039: print $client "ok\n";
1040: } else {
1041: print $client "error:$!\n";
1042: }
1043: } else {
1044: print $client "error:$!\n";
1045: }
1046: } else {
1047: print $client "refused\n";
1048: }
1049: # -------------------------------------------------------------------- rolesput
1050: } elsif ($userinput =~ /^rolesput/) {
1051: &Debug("rolesput");
1052: if ($wasenc==1) {
1053: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
1054: =split(/:/,$userinput);
1055: &Debug("cmd = ".$cmd." exedom= ".$exedom.
1056: "user = ".$exeuser." udom=".$udom.
1057: "what = ".$what);
1058: my $namespace='roles';
1059: chomp($what);
1060: my $proname=propath($udom,$uname);
1061: my $now=time;
1062: {
1063: my $hfh;
1064: if (
1065: $hfh=IO::File->new(">>$proname/$namespace.hist")
1066: ) {
1067: print $hfh "P:$now:$exedom:$exeuser:$what\n";
1068: }
1069: }
1070: my @pairs=split(/\&/,$what);
1071: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1072: foreach $pair (@pairs) {
1073: ($key,$value)=split(/=/,$pair);
1074: $hash{$key}=$value;
1075: }
1076: if (untie(%hash)) {
1077: print $client "ok\n";
1078: } else {
1079: print $client "error:$!\n";
1080: }
1081: } else {
1082: print $client "error:$!\n";
1083: }
1084: } else {
1085: print $client "refused\n";
1086: }
1087: # ------------------------------------------------------------------------- get
1088: } elsif ($userinput =~ /^get/) {
1089: my ($cmd,$udom,$uname,$namespace,$what)
1090: =split(/:/,$userinput);
1091: $namespace=~s/\//\_/g;
1092: $namespace=~s/\W//g;
1093: chomp($what);
1094: my @queries=split(/\&/,$what);
1095: my $proname=propath($udom,$uname);
1096: my $qresult='';
1097: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1098: for ($i=0;$i<=$#queries;$i++) {
1099: $qresult.="$hash{$queries[$i]}&";
1100: }
1101: if (untie(%hash)) {
1102: $qresult=~s/\&$//;
1103: print $client "$qresult\n";
1104: } else {
1105: print $client "error:$!\n";
1106: }
1107: } else {
1108: print $client "error:$!\n";
1109: }
1110: # ------------------------------------------------------------------------ eget
1111: } elsif ($userinput =~ /^eget/) {
1112: my ($cmd,$udom,$uname,$namespace,$what)
1113: =split(/:/,$userinput);
1114: $namespace=~s/\//\_/g;
1115: $namespace=~s/\W//g;
1116: chomp($what);
1117: my @queries=split(/\&/,$what);
1118: my $proname=propath($udom,$uname);
1119: my $qresult='';
1120: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1121: for ($i=0;$i<=$#queries;$i++) {
1122: $qresult.="$hash{$queries[$i]}&";
1123: }
1124: if (untie(%hash)) {
1125: $qresult=~s/\&$//;
1126: if ($cipher) {
1127: my $cmdlength=length($qresult);
1128: $qresult.=" ";
1129: my $encqresult='';
1130: for
1131: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
1132: $encqresult.=
1133: unpack("H16",
1134: $cipher->encrypt(substr($qresult,$encidx,8)));
1135: }
1136: print $client "enc:$cmdlength:$encqresult\n";
1137: } else {
1138: print $client "error:no_key\n";
1139: }
1140: } else {
1141: print $client "error:$!\n";
1142: }
1143: } else {
1144: print $client "error:$!\n";
1145: }
1146: # ------------------------------------------------------------------------- del
1147: } elsif ($userinput =~ /^del/) {
1148: my ($cmd,$udom,$uname,$namespace,$what)
1149: =split(/:/,$userinput);
1150: $namespace=~s/\//\_/g;
1151: $namespace=~s/\W//g;
1152: chomp($what);
1153: my $proname=propath($udom,$uname);
1154: my $now=time;
1155: unless ($namespace=~/^nohist\_/) {
1156: my $hfh;
1157: if (
1158: $hfh=IO::File->new(">>$proname/$namespace.hist")
1159: ) { print $hfh "D:$now:$what\n"; }
1160: }
1161: my @keys=split(/\&/,$what);
1162: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1163: foreach $key (@keys) {
1164: delete($hash{$key});
1165: }
1166: if (untie(%hash)) {
1167: print $client "ok\n";
1168: } else {
1169: print $client "error:$!\n";
1170: }
1171: } else {
1172: print $client "error:$!\n";
1173: }
1174: # ------------------------------------------------------------------------ keys
1175: } elsif ($userinput =~ /^keys/) {
1176: my ($cmd,$udom,$uname,$namespace)
1177: =split(/:/,$userinput);
1178: $namespace=~s/\//\_/g;
1179: $namespace=~s/\W//g;
1180: my $proname=propath($udom,$uname);
1181: my $qresult='';
1182: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1183: foreach $key (keys %hash) {
1184: $qresult.="$key&";
1185: }
1186: if (untie(%hash)) {
1187: $qresult=~s/\&$//;
1188: print $client "$qresult\n";
1189: } else {
1190: print $client "error:$!\n";
1191: }
1192: } else {
1193: print $client "error:$!\n";
1194: }
1195: # ------------------------------------------------------------------------ dump
1196: } elsif ($userinput =~ /^dump/) {
1197: my ($cmd,$udom,$uname,$namespace,$regexp)
1198: =split(/:/,$userinput);
1199: $namespace=~s/\//\_/g;
1200: $namespace=~s/\W//g;
1201: if (defined($regexp)) {
1202: $regexp=&unescape($regexp);
1203: } else {
1204: $regexp='.';
1205: }
1206: my $proname=propath($udom,$uname);
1207: my $qresult='';
1208: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1209: foreach $key (keys %hash) {
1210: if (eval('$key=~/$regexp/')) {
1211: $qresult.="$key=$hash{$key}&";
1212: }
1213: }
1214: if (untie(%hash)) {
1215: $qresult=~s/\&$//;
1216: print $client "$qresult\n";
1217: } else {
1218: print $client "error:$!\n";
1219: }
1220: } else {
1221: print $client "error:$!\n";
1222: }
1223: # ----------------------------------------------------------------------- store
1224: } elsif ($userinput =~ /^store/) {
1225: my ($cmd,$udom,$uname,$namespace,$rid,$what)
1226: =split(/:/,$userinput);
1227: $namespace=~s/\//\_/g;
1228: $namespace=~s/\W//g;
1229: if ($namespace ne 'roles') {
1230: chomp($what);
1231: my $proname=propath($udom,$uname);
1232: my $now=time;
1233: unless ($namespace=~/^nohist\_/) {
1234: my $hfh;
1235: if (
1236: $hfh=IO::File->new(">>$proname/$namespace.hist")
1237: ) { print $hfh "P:$now:$rid:$what\n"; }
1238: }
1239: my @pairs=split(/\&/,$what);
1240:
1241: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1242: my @previouskeys=split(/&/,$hash{"keys:$rid"});
1243: my $key;
1244: $hash{"version:$rid"}++;
1245: my $version=$hash{"version:$rid"};
1246: my $allkeys='';
1247: foreach $pair (@pairs) {
1248: ($key,$value)=split(/=/,$pair);
1249: $allkeys.=$key.':';
1250: $hash{"$version:$rid:$key"}=$value;
1251: }
1252: $hash{"$version:$rid:timestamp"}=$now;
1253: $allkeys.='timestamp';
1254: $hash{"$version:keys:$rid"}=$allkeys;
1255: if (untie(%hash)) {
1256: print $client "ok\n";
1257: } else {
1258: print $client "error:$!\n";
1259: }
1260: } else {
1261: print $client "error:$!\n";
1262: }
1263: } else {
1264: print $client "refused\n";
1265: }
1266: # --------------------------------------------------------------------- restore
1267: } elsif ($userinput =~ /^restore/) {
1268: my ($cmd,$udom,$uname,$namespace,$rid)
1269: =split(/:/,$userinput);
1270: $namespace=~s/\//\_/g;
1271: $namespace=~s/\W//g;
1272: chomp($rid);
1273: my $proname=propath($udom,$uname);
1274: my $qresult='';
1275: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1276: my $version=$hash{"version:$rid"};
1277: $qresult.="version=$version&";
1278: my $scope;
1279: for ($scope=1;$scope<=$version;$scope++) {
1280: my $vkeys=$hash{"$scope:keys:$rid"};
1281: my @keys=split(/:/,$vkeys);
1282: my $key;
1283: $qresult.="$scope:keys=$vkeys&";
1284: foreach $key (@keys) {
1285: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
1286: }
1287: }
1288: if (untie(%hash)) {
1289: $qresult=~s/\&$//;
1290: print $client "$qresult\n";
1291: } else {
1292: print $client "error:$!\n";
1293: }
1294: } else {
1295: print $client "error:$!\n";
1296: }
1297: # ------------------------------------------------------------------- querysend
1298: } elsif ($userinput =~ /^querysend/) {
1299: my ($cmd,$query,
1300: $custom,$customshow)=split(/:/,$userinput);
1301: $query=~s/\n*$//g;
1302: unless ($custom or $customshow) {
1303: print $client "".
1304: sqlreply("$hostid{$clientip}\&$query")."\n";
1305: }
1306: else {
1307: print $client "".
1308: sqlreply("$hostid{$clientip}\&$query".
1309: "\&$custom"."\&$customshow")."\n";
1310: }
1311: # ------------------------------------------------------------------ queryreply
1312: } elsif ($userinput =~ /^queryreply/) {
1313: my ($cmd,$id,$reply)=split(/:/,$userinput);
1314: my $store;
1315: my $execdir=$perlvar{'lonDaemons'};
1316: if ($store=IO::File->new(">$execdir/tmp/$id")) {
1317: $reply=~s/\&/\n/g;
1318: print $store $reply;
1319: close $store;
1320: my $store2=IO::File->new(">$execdir/tmp/$id.end");
1321: print $store2 "done\n";
1322: close $store2;
1323: print $client "ok\n";
1324: }
1325: else {
1326: print $client "error:$!\n";
1327: }
1328: # ----------------------------------------------------------------------- idput
1329: } elsif ($userinput =~ /^idput/) {
1330: my ($cmd,$udom,$what)=split(/:/,$userinput);
1331: chomp($what);
1332: $udom=~s/\W//g;
1333: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1334: my $now=time;
1335: {
1336: my $hfh;
1337: if (
1338: $hfh=IO::File->new(">>$proname.hist")
1339: ) { print $hfh "P:$now:$what\n"; }
1340: }
1341: my @pairs=split(/\&/,$what);
1342: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT,0640)) {
1343: foreach $pair (@pairs) {
1344: ($key,$value)=split(/=/,$pair);
1345: $hash{$key}=$value;
1346: }
1347: if (untie(%hash)) {
1348: print $client "ok\n";
1349: } else {
1350: print $client "error:$!\n";
1351: }
1352: } else {
1353: print $client "error:$!\n";
1354: }
1355: # ----------------------------------------------------------------------- idget
1356: } elsif ($userinput =~ /^idget/) {
1357: my ($cmd,$udom,$what)=split(/:/,$userinput);
1358: chomp($what);
1359: $udom=~s/\W//g;
1360: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1361: my @queries=split(/\&/,$what);
1362: my $qresult='';
1363: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER,0640)) {
1364: for ($i=0;$i<=$#queries;$i++) {
1365: $qresult.="$hash{$queries[$i]}&";
1366: }
1367: if (untie(%hash)) {
1368: $qresult=~s/\&$//;
1369: print $client "$qresult\n";
1370: } else {
1371: print $client "error:$!\n";
1372: }
1373: } else {
1374: print $client "error:$!\n";
1375: }
1376: # ---------------------------------------------------------------------- tmpput
1377: } elsif ($userinput =~ /^tmpput/) {
1378: my ($cmd,$what)=split(/:/,$userinput);
1379: my $store;
1380: $tmpsnum++;
1381: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
1382: $id=~s/\W/\_/g;
1383: $what=~s/\n//g;
1384: my $execdir=$perlvar{'lonDaemons'};
1385: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1386: print $store $what;
1387: close $store;
1388: print $client "$id\n";
1389: }
1390: else {
1391: print $client "error:$!\n";
1392: }
1393:
1394: # ---------------------------------------------------------------------- tmpget
1395: } elsif ($userinput =~ /^tmpget/) {
1396: my ($cmd,$id)=split(/:/,$userinput);
1397: chomp($id);
1398: $id=~s/\W/\_/g;
1399: my $store;
1400: my $execdir=$perlvar{'lonDaemons'};
1401: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
1402: my $reply=<$store>;
1403: print $client "$reply\n";
1404: close $store;
1405: }
1406: else {
1407: print $client "error:$!\n";
1408: }
1409:
1410: # -------------------------------------------------------------------------- ls
1411: } elsif ($userinput =~ /^ls/) {
1412: my ($cmd,$ulsdir)=split(/:/,$userinput);
1413: my $ulsout='';
1414: my $ulsfn;
1415: if (-e $ulsdir) {
1416: if (opendir(LSDIR,$ulsdir)) {
1417: while ($ulsfn=readdir(LSDIR)) {
1418: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1419: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1420: }
1421: closedir(LSDIR);
1422: }
1423: } else {
1424: $ulsout='no_such_dir';
1425: }
1426: if ($ulsout eq '') { $ulsout='empty'; }
1427: print $client "$ulsout\n";
1428: # ------------------------------------------------------------------ Hanging up
1429: } elsif (($userinput =~ /^exit/) ||
1430: ($userinput =~ /^init/)) {
1431: &logthis(
1432: "Client $clientip ($hostid{$clientip}) hanging up: $userinput");
1433: print $client "bye\n";
1434: $client->close();
1435: last;
1436: # ------------------------------------------------------------- unknown command
1437: } else {
1438: # unknown command
1439: print $client "unknown_cmd\n";
1440: }
1441: # -------------------------------------------------------------------- complete
1442: alarm(0);
1443: &status('Listening to '.$hostid{$clientip});
1444: }
1445: # --------------------------------------------- client unknown or fishy, refuse
1446: } else {
1447: print $client "refused\n";
1448: $client->close();
1449: &logthis("<font color=blue>WARNING: "
1450: ."Rejected client $clientip, closing connection</font>");
1451: }
1452: }
1453:
1454: # =============================================================================
1455:
1456: &logthis("<font color=red>CRITICAL: "
1457: ."Disconnect from $clientip ($hostid{$clientip})</font>");
1458: # tidy up gracefully and finish
1459:
1460: $server->close();
1461:
1462: # this exit is VERY important, otherwise the child will become
1463: # a producer of more and more children, forking yourself into
1464: # process death.
1465: exit;
1466: }
1467: }
1468:
1469: # ----------------------------------- POD (plain old documentation, CPAN style)
1470:
1471: =head1 NAME
1472:
1473: lond - "LON Daemon" Server (port "LOND" 5663)
1474:
1475: =head1 SYNOPSIS
1476:
1477: Usage: B<lond>
1478:
1479: Should only be run as user=www. This is a command-line script which
1480: is invoked by B<loncron>. There is no expectation that a typical user
1481: will manually start B<lond> from the command-line. (In other words,
1482: DO NOT START B<lond> YOURSELF.)
1483:
1484: =head1 DESCRIPTION
1485:
1486: There are two characteristics associated with the running of B<lond>,
1487: PROCESS MANAGEMENT (starting, stopping, handling child processes)
1488: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
1489: subscriptions, etc). These are described in two large
1490: sections below.
1491:
1492: B<PROCESS MANAGEMENT>
1493:
1494: Preforker - server who forks first. Runs as a daemon. HUPs.
1495: Uses IDEA encryption
1496:
1497: B<lond> forks off children processes that correspond to the other servers
1498: in the network. Management of these processes can be done at the
1499: parent process level or the child process level.
1500:
1501: B<logs/lond.log> is the location of log messages.
1502:
1503: The process management is now explained in terms of linux shell commands,
1504: subroutines internal to this code, and signal assignments:
1505:
1506: =over 4
1507:
1508: =item *
1509:
1510: PID is stored in B<logs/lond.pid>
1511:
1512: This is the process id number of the parent B<lond> process.
1513:
1514: =item *
1515:
1516: SIGTERM and SIGINT
1517:
1518: Parent signal assignment:
1519: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
1520:
1521: Child signal assignment:
1522: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
1523: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
1524: to restart a new child.)
1525:
1526: Command-line invocations:
1527: B<kill> B<-s> SIGTERM I<PID>
1528: B<kill> B<-s> SIGINT I<PID>
1529:
1530: Subroutine B<HUNTSMAN>:
1531: This is only invoked for the B<lond> parent I<PID>.
1532: This kills all the children, and then the parent.
1533: The B<lonc.pid> file is cleared.
1534:
1535: =item *
1536:
1537: SIGHUP
1538:
1539: Current bug:
1540: This signal can only be processed the first time
1541: on the parent process. Subsequent SIGHUP signals
1542: have no effect.
1543:
1544: Parent signal assignment:
1545: $SIG{HUP} = \&HUPSMAN;
1546:
1547: Child signal assignment:
1548: none (nothing happens)
1549:
1550: Command-line invocations:
1551: B<kill> B<-s> SIGHUP I<PID>
1552:
1553: Subroutine B<HUPSMAN>:
1554: This is only invoked for the B<lond> parent I<PID>,
1555: This kills all the children, and then the parent.
1556: The B<lond.pid> file is cleared.
1557:
1558: =item *
1559:
1560: SIGUSR1
1561:
1562: Parent signal assignment:
1563: $SIG{USR1} = \&USRMAN;
1564:
1565: Child signal assignment:
1566: $SIG{USR1}= \&logstatus;
1567:
1568: Command-line invocations:
1569: B<kill> B<-s> SIGUSR1 I<PID>
1570:
1571: Subroutine B<USRMAN>:
1572: When invoked for the B<lond> parent I<PID>,
1573: SIGUSR1 is sent to all the children, and the status of
1574: each connection is logged.
1575:
1576: =item *
1577:
1578: SIGCHLD
1579:
1580: Parent signal assignment:
1581: $SIG{CHLD} = \&REAPER;
1582:
1583: Child signal assignment:
1584: none
1585:
1586: Command-line invocations:
1587: B<kill> B<-s> SIGCHLD I<PID>
1588:
1589: Subroutine B<REAPER>:
1590: This is only invoked for the B<lond> parent I<PID>.
1591: Information pertaining to the child is removed.
1592: The socket port is cleaned up.
1593:
1594: =back
1595:
1596: B<SERVER-SIDE ACTIVITIES>
1597:
1598: Server-side information can be accepted in an encrypted or non-encrypted
1599: method.
1600:
1601: =over 4
1602:
1603: =item ping
1604:
1605: Query a client in the hosts.tab table; "Are you there?"
1606:
1607: =item pong
1608:
1609: Respond to a ping query.
1610:
1611: =item ekey
1612:
1613: Read in encrypted key, make cipher. Respond with a buildkey.
1614:
1615: =item load
1616:
1617: Respond with CPU load based on a computation upon /proc/loadavg.
1618:
1619: =item currentauth
1620:
1621: Reply with current authentication information (only over an
1622: encrypted channel).
1623:
1624: =item auth
1625:
1626: Only over an encrypted channel, reply as to whether a user's
1627: authentication information can be validated.
1628:
1629: =item passwd
1630:
1631: Allow for a password to be set.
1632:
1633: =item makeuser
1634:
1635: Make a user.
1636:
1637: =item passwd
1638:
1639: Allow for authentication mechanism and password to be changed.
1640:
1641: =item home
1642:
1643: Respond to a question "are you the home for a given user?"
1644:
1645: =item update
1646:
1647: Update contents of a subscribed resource.
1648:
1649: =item unsubscribe
1650:
1651: The server is unsubscribing from a resource.
1652:
1653: =item subscribe
1654:
1655: The server is subscribing to a resource.
1656:
1657: =item log
1658:
1659: Place in B<logs/lond.log>
1660:
1661: =item put
1662:
1663: stores hash in namespace
1664:
1665: =item rolesput
1666:
1667: put a role into a user's environment
1668:
1669: =item get
1670:
1671: returns hash with keys from array
1672: reference filled in from namespace
1673:
1674: =item eget
1675:
1676: returns hash with keys from array
1677: reference filled in from namesp (encrypts the return communication)
1678:
1679: =item rolesget
1680:
1681: get a role from a user's environment
1682:
1683: =item del
1684:
1685: deletes keys out of array from namespace
1686:
1687: =item keys
1688:
1689: returns namespace keys
1690:
1691: =item dump
1692:
1693: dumps the complete (or key matching regexp) namespace into a hash
1694:
1695: =item store
1696:
1697: stores hash permanently
1698: for this url; hashref needs to be given and should be a \%hashname; the
1699: remaining args aren't required and if they aren't passed or are '' they will
1700: be derived from the ENV
1701:
1702: =item restore
1703:
1704: returns a hash for a given url
1705:
1706: =item querysend
1707:
1708: Tells client about the lonsql process that has been launched in response
1709: to a sent query.
1710:
1711: =item queryreply
1712:
1713: Accept information from lonsql and make appropriate storage in temporary
1714: file space.
1715:
1716: =item idput
1717:
1718: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
1719: for each student, defined perhaps by the institutional Registrar.)
1720:
1721: =item idget
1722:
1723: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
1724: for each student, defined perhaps by the institutional Registrar.)
1725:
1726: =item tmpput
1727:
1728: Accept and store information in temporary space.
1729:
1730: =item tmpget
1731:
1732: Send along temporarily stored information.
1733:
1734: =item ls
1735:
1736: List part of a user's directory.
1737:
1738: =item Hanging up (exit or init)
1739:
1740: What to do when a client tells the server that they (the client)
1741: are leaving the network.
1742:
1743: =item unknown command
1744:
1745: If B<lond> is sent an unknown command (not in the list above),
1746: it replys to the client "unknown_cmd".
1747:
1748: =item UNKNOWN CLIENT
1749:
1750: If the anti-spoofing algorithm cannot verify the client,
1751: the client is rejected (with a "refused" message sent
1752: to the client, and the connection is closed.
1753:
1754: =back
1755:
1756: =head1 PREREQUISITES
1757:
1758: IO::Socket
1759: IO::File
1760: Apache::File
1761: Symbol
1762: POSIX
1763: Crypt::IDEA
1764: LWP::UserAgent()
1765: GDBM_File
1766: Authen::Krb4
1767:
1768: =head1 COREQUISITES
1769:
1770: =head1 OSNAMES
1771:
1772: linux
1773:
1774: =head1 SCRIPT CATEGORIES
1775:
1776: Server/Process
1777:
1778: =cut
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