1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.74 2002/03/03 19:49:00 harris41 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 $status='';
77: my $lastlog='';
78:
79: # grabs exception and records it to log before exiting
80: sub catchexception {
81: my ($error)=@_;
82: $SIG{'QUIT'}='DEFAULT';
83: $SIG{__DIE__}='DEFAULT';
84: &logthis("<font color=red>CRITICAL: "
85: ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
86: ."a crash with this error msg->[$error]</font>");
87: &logthis('Famous last words: '.$status.' - '.$lastlog);
88: if ($client) { print $client "error: $error\n"; }
89: $server->close();
90: die($error);
91: }
92:
93: sub timeout {
94: &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
95: &catchexception('Timeout');
96: }
97: # -------------------------------- Set signal handlers to record abnormal exits
98:
99: $SIG{'QUIT'}=\&catchexception;
100: $SIG{__DIE__}=\&catchexception;
101:
102: # ------------------------------------ Read httpd access.conf and get variables
103:
104: open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
105:
106: while ($configline=<CONFIG>) {
107: if ($configline =~ /PerlSetVar/) {
108: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
109: chomp($varvalue);
110: $perlvar{$varname}=$varvalue;
111: }
112: }
113: close(CONFIG);
114:
115: # ----------------------------- Make sure this process is running from user=www
116: my $wwwid=getpwnam('www');
117: if ($wwwid!=$<) {
118: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
119: $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
120: system("echo 'User ID mismatch. lond must be run as user www.' |\
121: mailto $emailto -s '$subj' > /dev/null");
122: exit 1;
123: }
124:
125: # --------------------------------------------- Check if other instance running
126:
127: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
128:
129: if (-e $pidfile) {
130: my $lfh=IO::File->new("$pidfile");
131: my $pide=<$lfh>;
132: chomp($pide);
133: if (kill 0 => $pide) { die "already running"; }
134: }
135:
136: $PREFORK=4; # number of children to maintain, at least four spare
137:
138: # ------------------------------------------------------------- Read hosts file
139:
140: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
141:
142: while ($configline=<CONFIG>) {
143: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
144: chomp($ip); $ip=~s/\D+$//;
145: $hostid{$ip}=$id;
146: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
147: $PREFORK++;
148: }
149: close(CONFIG);
150:
151: # establish SERVER socket, bind and listen.
152: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
153: Type => SOCK_STREAM,
154: Proto => 'tcp',
155: Reuse => 1,
156: Listen => 10 )
157: or die "making socket: $@\n";
158:
159: # --------------------------------------------------------- Do global variables
160:
161: # global variables
162:
163: $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should
164: # process
165: %children = (); # keys are current child process IDs
166: $children = 0; # current number of children
167:
168: sub REAPER { # takes care of dead children
169: $SIG{CHLD} = \&REAPER;
170: my $pid = wait;
171: if (defined($children{$pid})) {
172: &logthis("Child $pid died");
173: $children --;
174: delete $children{$pid};
175: } else {
176: &logthis("Unknown Child $pid died");
177: }
178: }
179:
180: sub HUNTSMAN { # signal handler for SIGINT
181: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
182: kill 'INT' => keys %children;
183: &logthis("Free socket: ".shutdown($server,2)); # free up socket
184: my $execdir=$perlvar{'lonDaemons'};
185: unlink("$execdir/logs/lond.pid");
186: &logthis("<font color=red>CRITICAL: Shutting down</font>");
187: exit; # clean up with dignity
188: }
189:
190: sub HUPSMAN { # signal handler for SIGHUP
191: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
192: kill 'INT' => keys %children;
193: &logthis("Free socket: ".shutdown($server,2)); # free up socket
194: &logthis("<font color=red>CRITICAL: Restarting</font>");
195: unlink("$execdir/logs/lond.pid");
196: my $execdir=$perlvar{'lonDaemons'};
197: exec("$execdir/lond"); # here we go again
198: }
199:
200: sub checkchildren {
201: &initnewstatus();
202: &logstatus();
203: &logthis('Going to check on the children');
204: $docdir=$perlvar{'lonDocRoot'};
205: foreach (sort keys %children) {
206: sleep 1;
207: unless (kill 'USR1' => $_) {
208: &logthis ('Child '.$_.' is dead');
209: &logstatus($$.' is dead');
210: }
211: }
212: sleep 5;
213: foreach (sort keys %children) {
214: unless (-e "$docdir/lon-status/londchld/$_.txt") {
215: &logthis('Child '.$_.' did not respond');
216: kill 9 => $_;
217: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
218: $subj="LON: $perlvar{'lonHostID'} killed lond process $_";
219: my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
220: $execdir=$perlvar{'lonDaemons'};
221: $result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`
222: }
223: }
224: }
225:
226: # --------------------------------------------------------------------- Logging
227:
228: sub logthis {
229: my $message=shift;
230: my $execdir=$perlvar{'lonDaemons'};
231: my $fh=IO::File->new(">>$execdir/logs/lond.log");
232: my $now=time;
233: my $local=localtime($now);
234: $lastlog=$local.': '.$message;
235: print $fh "$local ($$): $message\n";
236: }
237:
238: # ------------------------------------------------------------------ Log status
239:
240: sub logstatus {
241: my $docdir=$perlvar{'lonDocRoot'};
242: {
243: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
244: print $fh $$."\t".$status."\t".$lastlog."\n";
245: $fh->close();
246: }
247: {
248: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
249: print $fh $status."\n".$lastlog."\n".time;
250: $fh->close();
251: }
252: }
253:
254: sub initnewstatus {
255: my $docdir=$perlvar{'lonDocRoot'};
256: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
257: my $now=time;
258: my $local=localtime($now);
259: print $fh "LOND status $local - parent $$\n\n";
260: opendir(DIR,"$docdir/lon-status/londchld");
261: while ($filename=readdir(DIR)) {
262: unlink("$docdir/lon-status/londchld/$filename");
263: }
264: closedir(DIR);
265: }
266:
267: # -------------------------------------------------------------- Status setting
268:
269: sub status {
270: my $what=shift;
271: my $now=time;
272: my $local=localtime($now);
273: $status=$local.': '.$what;
274: }
275:
276: # -------------------------------------------------------- Escape Special Chars
277:
278: sub escape {
279: my $str=shift;
280: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
281: return $str;
282: }
283:
284: # ----------------------------------------------------- Un-Escape Special Chars
285:
286: sub unescape {
287: my $str=shift;
288: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
289: return $str;
290: }
291:
292: # ----------------------------------------------------------- Send USR1 to lonc
293:
294: sub reconlonc {
295: my $peerfile=shift;
296: &logthis("Trying to reconnect for $peerfile");
297: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
298: if (my $fh=IO::File->new("$loncfile")) {
299: my $loncpid=<$fh>;
300: chomp($loncpid);
301: if (kill 0 => $loncpid) {
302: &logthis("lonc at pid $loncpid responding, sending USR1");
303: kill USR1 => $loncpid;
304: sleep 1;
305: if (-e "$peerfile") { return; }
306: &logthis("$peerfile still not there, give it another try");
307: sleep 5;
308: if (-e "$peerfile") { return; }
309: &logthis(
310: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
311: } else {
312: &logthis(
313: "<font color=red>CRITICAL: "
314: ."lonc at pid $loncpid not responding, giving up</font>");
315: }
316: } else {
317: &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
318: }
319: }
320:
321: # -------------------------------------------------- Non-critical communication
322:
323: sub subreply {
324: my ($cmd,$server)=@_;
325: my $peerfile="$perlvar{'lonSockDir'}/$server";
326: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
327: Type => SOCK_STREAM,
328: Timeout => 10)
329: or return "con_lost";
330: print $sclient "$cmd\n";
331: my $answer=<$sclient>;
332: chomp($answer);
333: if (!$answer) { $answer="con_lost"; }
334: return $answer;
335: }
336:
337: sub reply {
338: my ($cmd,$server)=@_;
339: my $answer;
340: if ($server ne $perlvar{'lonHostID'}) {
341: $answer=subreply($cmd,$server);
342: if ($answer eq 'con_lost') {
343: $answer=subreply("ping",$server);
344: if ($answer ne $server) {
345: &reconlonc("$perlvar{'lonSockDir'}/$server");
346: }
347: $answer=subreply($cmd,$server);
348: }
349: } else {
350: $answer='self_reply';
351: }
352: return $answer;
353: }
354:
355: # -------------------------------------------------------------- Talk to lonsql
356:
357: sub sqlreply {
358: my ($cmd)=@_;
359: my $answer=subsqlreply($cmd);
360: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
361: return $answer;
362: }
363:
364: sub subsqlreply {
365: my ($cmd)=@_;
366: my $unixsock="mysqlsock";
367: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
368: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
369: Type => SOCK_STREAM,
370: Timeout => 10)
371: or return "con_lost";
372: print $sclient "$cmd\n";
373: my $answer=<$sclient>;
374: chomp($answer);
375: if (!$answer) { $answer="con_lost"; }
376: return $answer;
377: }
378:
379: # -------------------------------------------- Return path to profile directory
380:
381: sub propath {
382: my ($udom,$uname)=@_;
383: $udom=~s/\W//g;
384: $uname=~s/\W//g;
385: my $subdir=$uname.'__';
386: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
387: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
388: return $proname;
389: }
390:
391: # --------------------------------------- Is this the home server of an author?
392:
393: sub ishome {
394: my $author=shift;
395: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
396: my ($udom,$uname)=split(/\//,$author);
397: my $proname=propath($udom,$uname);
398: if (-e $proname) {
399: return 'owner';
400: } else {
401: return 'not_owner';
402: }
403: }
404:
405: # ======================================================= Continue main program
406: # ---------------------------------------------------- Fork once and dissociate
407:
408: $fpid=fork;
409: exit if $fpid;
410: die "Couldn't fork: $!" unless defined ($fpid);
411:
412: POSIX::setsid() or die "Can't start new session: $!";
413:
414: # ------------------------------------------------------- Write our PID on disk
415:
416: $execdir=$perlvar{'lonDaemons'};
417: open (PIDSAVE,">$execdir/logs/lond.pid");
418: print PIDSAVE "$$\n";
419: close(PIDSAVE);
420: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
421: &status('Starting');
422:
423: # ------------------------------------------------------- Now we are on our own
424:
425: # Fork off our children.
426: for (1 .. $PREFORK) {
427: make_new_child();
428: }
429:
430: # ----------------------------------------------------- Install signal handlers
431:
432: &status('Forked children');
433:
434: $SIG{CHLD} = \&REAPER;
435: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
436: $SIG{HUP} = \&HUPSMAN;
437: $SIG{USR1} = \&checkchildren;
438:
439: # And maintain the population.
440: while (1) {
441: &status('Sleeping');
442: sleep; # wait for a signal (i.e., child's death)
443: &logthis('Woke up');
444: &status('Woke up');
445: for ($i = $children; $i < $PREFORK; $i++) {
446: make_new_child(); # top up the child pool
447: }
448: }
449:
450: sub make_new_child {
451: my $pid;
452: my $cipher;
453: my $sigset;
454: &logthis("Attempting to start child");
455: # block signal for fork
456: $sigset = POSIX::SigSet->new(SIGINT);
457: sigprocmask(SIG_BLOCK, $sigset)
458: or die "Can't block SIGINT for fork: $!\n";
459:
460: die "fork: $!" unless defined ($pid = fork);
461:
462: if ($pid) {
463: # Parent records the child's birth and returns.
464: sigprocmask(SIG_UNBLOCK, $sigset)
465: or die "Can't unblock SIGINT for fork: $!\n";
466: $children{$pid} = 1;
467: $children++;
468: &status('Started child '.$pid);
469: return;
470: } else {
471: # Child can *not* return from this subroutine.
472: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
473: $SIG{USR1}= \&logstatus;
474: $SIG{ALRM}= \&timeout;
475: $lastlog='Forked ';
476: $status='Forked';
477:
478: # unblock signals
479: sigprocmask(SIG_UNBLOCK, $sigset)
480: or die "Can't unblock SIGINT for fork: $!\n";
481:
482: $tmpsnum=0;
483:
484: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
485: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
486: &status('Idle, waiting for connection');
487: $client = $server->accept() or last;
488: &status('Accepted connection');
489: # =============================================================================
490: # do something with the connection
491: # -----------------------------------------------------------------------------
492: # see if we know client and check for spoof IP by challenge
493: my $caller=getpeername($client);
494: my ($port,$iaddr)=unpack_sockaddr_in($caller);
495: my $clientip=inet_ntoa($iaddr);
496: my $clientrec=($hostid{$clientip} ne undef);
497: &logthis(
498: "<font color=yellow>INFO: Connection $i, $clientip ($hostid{$clientip})</font>"
499: );
500: &status("Connecting $clientip ($hostid{$clientip})");
501: my $clientok;
502: if ($clientrec) {
503: &status("Waiting for init from $clientip ($hostid{$clientip})");
504: my $remotereq=<$client>;
505: $remotereq=~s/\W//g;
506: if ($remotereq eq 'init') {
507: my $challenge="$$".time;
508: print $client "$challenge\n";
509: &status(
510: "Waiting for challenge reply from $clientip ($hostid{$clientip})");
511: $remotereq=<$client>;
512: $remotereq=~s/\W//g;
513: if ($challenge eq $remotereq) {
514: $clientok=1;
515: print $client "ok\n";
516: } else {
517: &logthis(
518: "<font color=blue>WARNING: $clientip did not reply challenge</font>");
519: &status('No challenge reply '.$clientip);
520: }
521: } else {
522: &logthis(
523: "<font color=blue>WARNING: "
524: ."$clientip failed to initialize: >$remotereq< </font>");
525: &status('No init '.$clientip);
526: }
527: } else {
528: &logthis(
529: "<font color=blue>WARNING: Unknown client $clientip</font>");
530: &status('Hung up on '.$clientip);
531: }
532: if ($clientok) {
533: # ---------------- New known client connecting, could mean machine online again
534: &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
535: &logthis(
536: "<font color=green>Established connection: $hostid{$clientip}</font>");
537: &status('Will listen to '.$hostid{$clientip});
538: # ------------------------------------------------------------ Process requests
539: while (my $userinput=<$client>) {
540: chomp($userinput);
541: &status('Processing '.$hostid{$clientip}.': '.$userinput);
542: my $wasenc=0;
543: alarm(120);
544: # ------------------------------------------------------------ See if encrypted
545: if ($userinput =~ /^enc/) {
546: if ($cipher) {
547: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
548: $userinput='';
549: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
550: $userinput.=
551: $cipher->decrypt(
552: pack("H16",substr($encinput,$encidx,16))
553: );
554: }
555: $userinput=substr($userinput,0,$cmdlength);
556: $wasenc=1;
557: }
558: }
559: # ------------------------------------------------------------- Normal commands
560: # ------------------------------------------------------------------------ ping
561: if ($userinput =~ /^ping/) {
562: print $client "$perlvar{'lonHostID'}\n";
563: # ------------------------------------------------------------------------ pong
564: } elsif ($userinput =~ /^pong/) {
565: $reply=reply("ping",$hostid{$clientip});
566: print $client "$perlvar{'lonHostID'}:$reply\n";
567: # ------------------------------------------------------------------------ ekey
568: } elsif ($userinput =~ /^ekey/) {
569: my $buildkey=time.$$.int(rand 100000);
570: $buildkey=~tr/1-6/A-F/;
571: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
572: my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
573: $key=~tr/a-z/A-Z/;
574: $key=~tr/G-P/0-9/;
575: $key=~tr/Q-Z/0-9/;
576: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
577: $key=substr($key,0,32);
578: my $cipherkey=pack("H32",$key);
579: $cipher=new IDEA $cipherkey;
580: print $client "$buildkey\n";
581: # ------------------------------------------------------------------------ load
582: } elsif ($userinput =~ /^load/) {
583: my $loadavg;
584: {
585: my $loadfile=IO::File->new('/proc/loadavg');
586: $loadavg=<$loadfile>;
587: }
588: $loadavg =~ s/\s.*//g;
589: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
590: print $client "$loadpercent\n";
591: # ----------------------------------------------------------------- currentauth
592: } elsif ($userinput =~ /^currentauth/) {
593: if ($wasenc==1) {
594: my ($cmd,$udom,$uname)=split(/:/,$userinput);
595: my $proname=propath($udom,$uname);
596: my $passfilename="$proname/passwd";
597: if (-e $passfilename) {
598: my $pf = IO::File->new($passfilename);
599: my $realpasswd=<$pf>;
600: chomp($realpasswd);
601: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
602: my $availablecontent='';
603: if ($howpwd eq 'krb4') {
604: $availablecontent=$contentpwd;
605: }
606: print $client "$howpwd:$availablecontent\n";
607: } else {
608: print $client "unknown_user\n";
609: }
610: } else {
611: print $client "refused\n";
612: }
613: # ------------------------------------------------------------------------ auth
614: } elsif ($userinput =~ /^auth/) {
615: if ($wasenc==1) {
616: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
617: chomp($upass);
618: $upass=unescape($upass);
619: my $proname=propath($udom,$uname);
620: my $passfilename="$proname/passwd";
621: if (-e $passfilename) {
622: my $pf = IO::File->new($passfilename);
623: my $realpasswd=<$pf>;
624: chomp($realpasswd);
625: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
626: my $pwdcorrect=0;
627: if ($howpwd eq 'internal') {
628: $pwdcorrect=
629: (crypt($upass,$contentpwd) eq $contentpwd);
630: } elsif ($howpwd eq 'unix') {
631: $contentpwd=(getpwnam($uname))[1];
632: my $pwauth_path="/usr/local/sbin/pwauth";
633: unless ($contentpwd eq 'x') {
634: $pwdcorrect=
635: (crypt($upass,$contentpwd) eq $contentpwd);
636: }
637: elsif (-e $pwauth_path) {
638: open PWAUTH, "|$pwauth_path" or
639: die "Cannot invoke authentication";
640: print PWAUTH "$uname\n$upass\n";
641: close PWAUTH;
642: $pwdcorrect=!$?;
643: }
644: } elsif ($howpwd eq 'krb4') {
645: $null=pack("C",0);
646: unless ($upass=~/$null/) {
647: $pwdcorrect=(
648: Authen::Krb4::get_pw_in_tkt($uname,"",
649: $contentpwd,'krbtgt',$contentpwd,1,
650: $upass) == 0);
651: } else { $pwdcorrect=0; }
652: } elsif ($howpwd eq 'localauth') {
653: $pwdcorrect=&localauth::localauth($uname,$upass,
654: $contentpwd);
655: }
656: if ($pwdcorrect) {
657: print $client "authorized\n";
658: } else {
659: print $client "non_authorized\n";
660: }
661: } else {
662: print $client "unknown_user\n";
663: }
664: } else {
665: print $client "refused\n";
666: }
667: # ---------------------------------------------------------------------- passwd
668: } elsif ($userinput =~ /^passwd/) {
669: if ($wasenc==1) {
670: my
671: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
672: chomp($npass);
673: $upass=&unescape($upass);
674: $npass=&unescape($npass);
675: &logthis("Trying to change password for $uname");
676: my $proname=propath($udom,$uname);
677: my $passfilename="$proname/passwd";
678: if (-e $passfilename) {
679: my $realpasswd;
680: { my $pf = IO::File->new($passfilename);
681: $realpasswd=<$pf>; }
682: chomp($realpasswd);
683: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
684: if ($howpwd eq 'internal') {
685: if (crypt($upass,$contentpwd) eq $contentpwd) {
686: my $salt=time;
687: $salt=substr($salt,6,2);
688: my $ncpass=crypt($npass,$salt);
689: { my $pf = IO::File->new(">$passfilename");
690: print $pf "internal:$ncpass\n"; }
691: &logthis("Result of password change for $uname: pwchange_success");
692: print $client "ok\n";
693: } else {
694: print $client "non_authorized\n";
695: }
696: } elsif ($howpwd eq 'unix') {
697: # Unix means we have to access /etc/password
698: # one way or another.
699: # First: Make sure the current password is
700: # correct
701: $contentpwd=(getpwnam($uname))[1];
702: my $pwdcorrect = "0";
703: my $pwauth_path="/usr/local/sbin/pwauth";
704: unless ($contentpwd eq 'x') {
705: $pwdcorrect=
706: (crypt($upass,$contentpwd) eq $contentpwd);
707: } elsif (-e $pwauth_path) {
708: open PWAUTH, "|$pwauth_path" or
709: die "Cannot invoke authentication";
710: print PWAUTH "$uname\n$upass\n";
711: close PWAUTH;
712: $pwdcorrect=!$?;
713: }
714: if ($pwdcorrect) {
715: my $execdir=$perlvar{'lonDaemons'};
716: my $pf = IO::File->new("|$execdir/lcpasswd");
717: print $pf "$uname\n$npass\n$npass\n";
718: close $pf;
719: my $result = ($?>0 ? 'pwchange_failure'
720: : 'ok');
721: &logthis("Result of password change for $uname: $result");
722: print $client "$result\n";
723: } else {
724: print $client "non_authorized\n";
725: }
726: } else {
727: print $client "auth_mode_error\n";
728: }
729: } else {
730: print $client "unknown_user\n";
731: }
732: } else {
733: print $client "refused\n";
734: }
735: # -------------------------------------------------------------------- makeuser
736: } elsif ($userinput =~ /^makeuser/) {
737: my $oldumask=umask(0077);
738: if ($wasenc==1) {
739: my
740: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
741: chomp($npass);
742: $npass=&unescape($npass);
743: my $proname=propath($udom,$uname);
744: my $passfilename="$proname/passwd";
745: if (-e $passfilename) {
746: print $client "already_exists\n";
747: } elsif ($udom ne $perlvar{'lonDefDomain'}) {
748: print $client "not_right_domain\n";
749: } else {
750: @fpparts=split(/\//,$proname);
751: $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
752: $fperror='';
753: for ($i=3;$i<=$#fpparts;$i++) {
754: $fpnow.='/'.$fpparts[$i];
755: unless (-e $fpnow) {
756: unless (mkdir($fpnow,0777)) {
757: $fperror="error:$!";
758: }
759: }
760: }
761: unless ($fperror) {
762: if ($umode eq 'krb4') {
763: {
764: my $pf = IO::File->new(">$passfilename");
765: print $pf "krb4:$npass\n";
766: }
767: print $client "ok\n";
768: } elsif ($umode eq 'internal') {
769: my $salt=time;
770: $salt=substr($salt,6,2);
771: my $ncpass=crypt($npass,$salt);
772: {
773: my $pf = IO::File->new(">$passfilename");
774: print $pf "internal:$ncpass\n";
775: }
776: print $client "ok\n";
777: } elsif ($umode eq 'localauth') {
778: {
779: my $pf = IO::File->new(">$passfilename");
780: print $pf "localauth:$npass\n";
781: }
782: print $client "ok\n";
783: } elsif ($umode eq 'unix') {
784: {
785: my $execpath="$perlvar{'lonDaemons'}/".
786: "lcuseradd";
787: {
788: my $se = IO::File->new("|$execpath");
789: print $se "$uname\n";
790: print $se "$npass\n";
791: print $se "$npass\n";
792: }
793: my $pf = IO::File->new(">$passfilename");
794: print $pf "unix:\n";
795: }
796: print $client "ok\n";
797: } elsif ($umode eq 'none') {
798: {
799: my $pf = IO::File->new(">$passfilename");
800: print $pf "none:\n";
801: }
802: print $client "ok\n";
803: } else {
804: print $client "auth_mode_error\n";
805: }
806: } else {
807: print $client "$fperror\n";
808: }
809: }
810: } else {
811: print $client "refused\n";
812: }
813: umask($oldumask);
814: # -------------------------------------------------------------- changeuserauth
815: } elsif ($userinput =~ /^changeuserauth/) {
816: if ($wasenc==1) {
817: my
818: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
819: chomp($npass);
820: $npass=&unescape($npass);
821: my $proname=propath($udom,$uname);
822: my $passfilename="$proname/passwd";
823: if ($udom ne $perlvar{'lonDefDomain'}) {
824: print $client "not_right_domain\n";
825: } else {
826: if ($umode eq 'krb4') {
827: {
828: my $pf = IO::File->new(">$passfilename");
829: print $pf "krb4:$npass\n";
830: }
831: print $client "ok\n";
832: } elsif ($umode eq 'internal') {
833: my $salt=time;
834: $salt=substr($salt,6,2);
835: my $ncpass=crypt($npass,$salt);
836: {
837: my $pf = IO::File->new(">$passfilename");
838: print $pf "internal:$ncpass\n";
839: }
840: print $client "ok\n";
841: } elsif ($umode eq 'localauth') {
842: {
843: my $pf = IO::File->new(">$passfilename");
844: print $pf "localauth:$npass\n";
845: }
846: print $client "ok\n";
847: } elsif ($umode eq 'unix') {
848: {
849: my $execpath="$perlvar{'lonDaemons'}/".
850: "lcuseradd";
851: {
852: my $se = IO::File->new("|$execpath");
853: print $se "$uname\n";
854: print $se "$npass\n";
855: print $se "$npass\n";
856: }
857: my $pf = IO::File->new(">$passfilename");
858: print $pf "unix:\n";
859: }
860: print $client "ok\n";
861: } elsif ($umode eq 'none') {
862: {
863: my $pf = IO::File->new(">$passfilename");
864: print $pf "none:\n";
865: }
866: print $client "ok\n";
867: } else {
868: print $client "auth_mode_error\n";
869: }
870: }
871: } else {
872: print $client "refused\n";
873: }
874: # ------------------------------------------------------------------------ home
875: } elsif ($userinput =~ /^home/) {
876: my ($cmd,$udom,$uname)=split(/:/,$userinput);
877: chomp($uname);
878: my $proname=propath($udom,$uname);
879: if (-e $proname) {
880: print $client "found\n";
881: } else {
882: print $client "not_found\n";
883: }
884: # ---------------------------------------------------------------------- update
885: } elsif ($userinput =~ /^update/) {
886: my ($cmd,$fname)=split(/:/,$userinput);
887: my $ownership=ishome($fname);
888: if ($ownership eq 'not_owner') {
889: if (-e $fname) {
890: my ($dev,$ino,$mode,$nlink,
891: $uid,$gid,$rdev,$size,
892: $atime,$mtime,$ctime,
893: $blksize,$blocks)=stat($fname);
894: $now=time;
895: $since=$now-$atime;
896: if ($since>$perlvar{'lonExpire'}) {
897: $reply=
898: reply("unsub:$fname","$hostid{$clientip}");
899: unlink("$fname");
900: } else {
901: my $transname="$fname.in.transfer";
902: my $remoteurl=
903: reply("sub:$fname","$hostid{$clientip}");
904: my $response;
905: {
906: my $ua=new LWP::UserAgent;
907: my $request=new HTTP::Request('GET',"$remoteurl");
908: $response=$ua->request($request,$transname);
909: }
910: if ($response->is_error()) {
911: unlink($transname);
912: my $message=$response->status_line;
913: &logthis(
914: "LWP GET: $message for $fname ($remoteurl)");
915: } else {
916: if ($remoteurl!~/\.meta$/) {
917: my $ua=new LWP::UserAgent;
918: my $mrequest=
919: new HTTP::Request('GET',$remoteurl.'.meta');
920: my $mresponse=
921: $ua->request($mrequest,$fname.'.meta');
922: if ($mresponse->is_error()) {
923: unlink($fname.'.meta');
924: }
925: }
926: rename($transname,$fname);
927: }
928: }
929: print $client "ok\n";
930: } else {
931: print $client "not_found\n";
932: }
933: } else {
934: print $client "rejected\n";
935: }
936: # ----------------------------------------------------------------- unsubscribe
937: } elsif ($userinput =~ /^unsub/) {
938: my ($cmd,$fname)=split(/:/,$userinput);
939: if (-e $fname) {
940: if (unlink("$fname.$hostid{$clientip}")) {
941: print $client "ok\n";
942: } else {
943: print $client "not_subscribed\n";
944: }
945: } else {
946: print $client "not_found\n";
947: }
948: # ------------------------------------------------------------------- subscribe
949: } elsif ($userinput =~ /^sub/) {
950: my ($cmd,$fname)=split(/:/,$userinput);
951: my $ownership=ishome($fname);
952: if ($ownership eq 'owner') {
953: if (-e $fname) {
954: if (-d $fname) {
955: print $client "directory\n";
956: } else {
957: $now=time;
958: {
959: my $sh;
960: if ($sh=
961: IO::File->new(">$fname.$hostid{$clientip}")) {
962: print $sh "$clientip:$now\n";
963: }
964: }
965: unless ($fname=~/\.meta$/) {
966: unlink("$fname.meta.$hostid{$clientip}");
967: }
968: $fname=~s/\/home\/httpd\/html\/res/raw/;
969: $fname="http://$thisserver/".$fname;
970: print $client "$fname\n";
971: }
972: } else {
973: print $client "not_found\n";
974: }
975: } else {
976: print $client "rejected\n";
977: }
978: # ------------------------------------------------------------------------- log
979: } elsif ($userinput =~ /^log/) {
980: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
981: chomp($what);
982: my $proname=propath($udom,$uname);
983: my $now=time;
984: {
985: my $hfh;
986: if ($hfh=IO::File->new(">>$proname/activity.log")) {
987: print $hfh "$now:$hostid{$clientip}:$what\n";
988: print $client "ok\n";
989: } else {
990: print $client "error:$!\n";
991: }
992: }
993: # ------------------------------------------------------------------------- put
994: } elsif ($userinput =~ /^put/) {
995: my ($cmd,$udom,$uname,$namespace,$what)
996: =split(/:/,$userinput);
997: $namespace=~s/\//\_/g;
998: $namespace=~s/\W//g;
999: if ($namespace ne 'roles') {
1000: chomp($what);
1001: my $proname=propath($udom,$uname);
1002: my $now=time;
1003: unless ($namespace=~/^nohist\_/) {
1004: my $hfh;
1005: if (
1006: $hfh=IO::File->new(">>$proname/$namespace.hist")
1007: ) { print $hfh "P:$now:$what\n"; }
1008: }
1009: my @pairs=split(/\&/,$what);
1010: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1011: foreach $pair (@pairs) {
1012: ($key,$value)=split(/=/,$pair);
1013: $hash{$key}=$value;
1014: }
1015: if (untie(%hash)) {
1016: print $client "ok\n";
1017: } else {
1018: print $client "error:$!\n";
1019: }
1020: } else {
1021: print $client "error:$!\n";
1022: }
1023: } else {
1024: print $client "refused\n";
1025: }
1026: # -------------------------------------------------------------------- rolesput
1027: } elsif ($userinput =~ /^rolesput/) {
1028: if ($wasenc==1) {
1029: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
1030: =split(/:/,$userinput);
1031: my $namespace='roles';
1032: chomp($what);
1033: my $proname=propath($udom,$uname);
1034: my $now=time;
1035: {
1036: my $hfh;
1037: if (
1038: $hfh=IO::File->new(">>$proname/$namespace.hist")
1039: ) {
1040: print $hfh "P:$now:$exedom:$exeuser:$what\n";
1041: }
1042: }
1043: my @pairs=split(/\&/,$what);
1044: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1045: foreach $pair (@pairs) {
1046: ($key,$value)=split(/=/,$pair);
1047: $hash{$key}=$value;
1048: }
1049: if (untie(%hash)) {
1050: print $client "ok\n";
1051: } else {
1052: print $client "error:$!\n";
1053: }
1054: } else {
1055: print $client "error:$!\n";
1056: }
1057: } else {
1058: print $client "refused\n";
1059: }
1060: # ------------------------------------------------------------------------- get
1061: } elsif ($userinput =~ /^get/) {
1062: my ($cmd,$udom,$uname,$namespace,$what)
1063: =split(/:/,$userinput);
1064: $namespace=~s/\//\_/g;
1065: $namespace=~s/\W//g;
1066: chomp($what);
1067: my @queries=split(/\&/,$what);
1068: my $proname=propath($udom,$uname);
1069: my $qresult='';
1070: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1071: for ($i=0;$i<=$#queries;$i++) {
1072: $qresult.="$hash{$queries[$i]}&";
1073: }
1074: if (untie(%hash)) {
1075: $qresult=~s/\&$//;
1076: print $client "$qresult\n";
1077: } else {
1078: print $client "error:$!\n";
1079: }
1080: } else {
1081: print $client "error:$!\n";
1082: }
1083: # ------------------------------------------------------------------------ eget
1084: } elsif ($userinput =~ /^eget/) {
1085: my ($cmd,$udom,$uname,$namespace,$what)
1086: =split(/:/,$userinput);
1087: $namespace=~s/\//\_/g;
1088: $namespace=~s/\W//g;
1089: chomp($what);
1090: my @queries=split(/\&/,$what);
1091: my $proname=propath($udom,$uname);
1092: my $qresult='';
1093: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1094: for ($i=0;$i<=$#queries;$i++) {
1095: $qresult.="$hash{$queries[$i]}&";
1096: }
1097: if (untie(%hash)) {
1098: $qresult=~s/\&$//;
1099: if ($cipher) {
1100: my $cmdlength=length($qresult);
1101: $qresult.=" ";
1102: my $encqresult='';
1103: for
1104: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
1105: $encqresult.=
1106: unpack("H16",
1107: $cipher->encrypt(substr($qresult,$encidx,8)));
1108: }
1109: print $client "enc:$cmdlength:$encqresult\n";
1110: } else {
1111: print $client "error:no_key\n";
1112: }
1113: } else {
1114: print $client "error:$!\n";
1115: }
1116: } else {
1117: print $client "error:$!\n";
1118: }
1119: # ------------------------------------------------------------------------- del
1120: } elsif ($userinput =~ /^del/) {
1121: my ($cmd,$udom,$uname,$namespace,$what)
1122: =split(/:/,$userinput);
1123: $namespace=~s/\//\_/g;
1124: $namespace=~s/\W//g;
1125: chomp($what);
1126: my $proname=propath($udom,$uname);
1127: my $now=time;
1128: unless ($namespace=~/^nohist\_/) {
1129: my $hfh;
1130: if (
1131: $hfh=IO::File->new(">>$proname/$namespace.hist")
1132: ) { print $hfh "D:$now:$what\n"; }
1133: }
1134: my @keys=split(/\&/,$what);
1135: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1136: foreach $key (@keys) {
1137: delete($hash{$key});
1138: }
1139: if (untie(%hash)) {
1140: print $client "ok\n";
1141: } else {
1142: print $client "error:$!\n";
1143: }
1144: } else {
1145: print $client "error:$!\n";
1146: }
1147: # ------------------------------------------------------------------------ keys
1148: } elsif ($userinput =~ /^keys/) {
1149: my ($cmd,$udom,$uname,$namespace)
1150: =split(/:/,$userinput);
1151: $namespace=~s/\//\_/g;
1152: $namespace=~s/\W//g;
1153: my $proname=propath($udom,$uname);
1154: my $qresult='';
1155: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1156: foreach $key (keys %hash) {
1157: $qresult.="$key&";
1158: }
1159: if (untie(%hash)) {
1160: $qresult=~s/\&$//;
1161: print $client "$qresult\n";
1162: } else {
1163: print $client "error:$!\n";
1164: }
1165: } else {
1166: print $client "error:$!\n";
1167: }
1168: # ------------------------------------------------------------------------ dump
1169: } elsif ($userinput =~ /^dump/) {
1170: my ($cmd,$udom,$uname,$namespace,$regexp)
1171: =split(/:/,$userinput);
1172: $namespace=~s/\//\_/g;
1173: $namespace=~s/\W//g;
1174: if (defined($regexp)) {
1175: $regexp=&unescape($regexp);
1176: } else {
1177: $regexp='.';
1178: }
1179: my $proname=propath($udom,$uname);
1180: my $qresult='';
1181: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1182: foreach $key (keys %hash) {
1183: if (eval('$key=~/$regexp/')) {
1184: $qresult.="$key=$hash{$key}&";
1185: }
1186: }
1187: if (untie(%hash)) {
1188: $qresult=~s/\&$//;
1189: print $client "$qresult\n";
1190: } else {
1191: print $client "error:$!\n";
1192: }
1193: } else {
1194: print $client "error:$!\n";
1195: }
1196: # ----------------------------------------------------------------------- store
1197: } elsif ($userinput =~ /^store/) {
1198: my ($cmd,$udom,$uname,$namespace,$rid,$what)
1199: =split(/:/,$userinput);
1200: $namespace=~s/\//\_/g;
1201: $namespace=~s/\W//g;
1202: if ($namespace ne 'roles') {
1203: chomp($what);
1204: my $proname=propath($udom,$uname);
1205: my $now=time;
1206: unless ($namespace=~/^nohist\_/) {
1207: my $hfh;
1208: if (
1209: $hfh=IO::File->new(">>$proname/$namespace.hist")
1210: ) { print $hfh "P:$now:$rid:$what\n"; }
1211: }
1212: my @pairs=split(/\&/,$what);
1213:
1214: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1215: my @previouskeys=split(/&/,$hash{"keys:$rid"});
1216: my $key;
1217: $hash{"version:$rid"}++;
1218: my $version=$hash{"version:$rid"};
1219: my $allkeys='';
1220: foreach $pair (@pairs) {
1221: ($key,$value)=split(/=/,$pair);
1222: $allkeys.=$key.':';
1223: $hash{"$version:$rid:$key"}=$value;
1224: }
1225: $hash{"$version:$rid:timestamp"}=$now;
1226: $allkeys.='timestamp';
1227: $hash{"$version:keys:$rid"}=$allkeys;
1228: if (untie(%hash)) {
1229: print $client "ok\n";
1230: } else {
1231: print $client "error:$!\n";
1232: }
1233: } else {
1234: print $client "error:$!\n";
1235: }
1236: } else {
1237: print $client "refused\n";
1238: }
1239: # --------------------------------------------------------------------- restore
1240: } elsif ($userinput =~ /^restore/) {
1241: my ($cmd,$udom,$uname,$namespace,$rid)
1242: =split(/:/,$userinput);
1243: $namespace=~s/\//\_/g;
1244: $namespace=~s/\W//g;
1245: chomp($rid);
1246: my $proname=propath($udom,$uname);
1247: my $qresult='';
1248: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1249: my $version=$hash{"version:$rid"};
1250: $qresult.="version=$version&";
1251: my $scope;
1252: for ($scope=1;$scope<=$version;$scope++) {
1253: my $vkeys=$hash{"$scope:keys:$rid"};
1254: my @keys=split(/:/,$vkeys);
1255: my $key;
1256: $qresult.="$scope:keys=$vkeys&";
1257: foreach $key (@keys) {
1258: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
1259: }
1260: }
1261: if (untie(%hash)) {
1262: $qresult=~s/\&$//;
1263: print $client "$qresult\n";
1264: } else {
1265: print $client "error:$!\n";
1266: }
1267: } else {
1268: print $client "error:$!\n";
1269: }
1270: # ------------------------------------------------------------------- querysend
1271: } elsif ($userinput =~ /^querysend/) {
1272: my ($cmd,$query,
1273: $custom,$customshow)=split(/:/,$userinput);
1274: $query=~s/\n*$//g;
1275: unless ($custom or $customshow) {
1276: print $client "".
1277: sqlreply("$hostid{$clientip}\&$query")."\n";
1278: }
1279: else {
1280: print $client "".
1281: sqlreply("$hostid{$clientip}\&$query".
1282: "\&$custom"."\&$customshow")."\n";
1283: }
1284: # ------------------------------------------------------------------ queryreply
1285: } elsif ($userinput =~ /^queryreply/) {
1286: my ($cmd,$id,$reply)=split(/:/,$userinput);
1287: my $store;
1288: my $execdir=$perlvar{'lonDaemons'};
1289: if ($store=IO::File->new(">$execdir/tmp/$id")) {
1290: $reply=~s/\&/\n/g;
1291: print $store $reply;
1292: close $store;
1293: my $store2=IO::File->new(">$execdir/tmp/$id.end");
1294: print $store2 "done\n";
1295: close $store2;
1296: print $client "ok\n";
1297: }
1298: else {
1299: print $client "error:$!\n";
1300: }
1301: # ----------------------------------------------------------------------- idput
1302: } elsif ($userinput =~ /^idput/) {
1303: my ($cmd,$udom,$what)=split(/:/,$userinput);
1304: chomp($what);
1305: $udom=~s/\W//g;
1306: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1307: my $now=time;
1308: {
1309: my $hfh;
1310: if (
1311: $hfh=IO::File->new(">>$proname.hist")
1312: ) { print $hfh "P:$now:$what\n"; }
1313: }
1314: my @pairs=split(/\&/,$what);
1315: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT,0640)) {
1316: foreach $pair (@pairs) {
1317: ($key,$value)=split(/=/,$pair);
1318: $hash{$key}=$value;
1319: }
1320: if (untie(%hash)) {
1321: print $client "ok\n";
1322: } else {
1323: print $client "error:$!\n";
1324: }
1325: } else {
1326: print $client "error:$!\n";
1327: }
1328: # ----------------------------------------------------------------------- idget
1329: } elsif ($userinput =~ /^idget/) {
1330: my ($cmd,$udom,$what)=split(/:/,$userinput);
1331: chomp($what);
1332: $udom=~s/\W//g;
1333: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1334: my @queries=split(/\&/,$what);
1335: my $qresult='';
1336: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER,0640)) {
1337: for ($i=0;$i<=$#queries;$i++) {
1338: $qresult.="$hash{$queries[$i]}&";
1339: }
1340: if (untie(%hash)) {
1341: $qresult=~s/\&$//;
1342: print $client "$qresult\n";
1343: } else {
1344: print $client "error:$!\n";
1345: }
1346: } else {
1347: print $client "error:$!\n";
1348: }
1349: # ---------------------------------------------------------------------- tmpput
1350: } elsif ($userinput =~ /^tmpput/) {
1351: my ($cmd,$what)=split(/:/,$userinput);
1352: my $store;
1353: $tmpsnum++;
1354: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
1355: $id=~s/\W/\_/g;
1356: $what=~s/\n//g;
1357: my $execdir=$perlvar{'lonDaemons'};
1358: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1359: print $store $what;
1360: close $store;
1361: print $client "$id\n";
1362: }
1363: else {
1364: print $client "error:$!\n";
1365: }
1366:
1367: # ---------------------------------------------------------------------- tmpget
1368: } elsif ($userinput =~ /^tmpget/) {
1369: my ($cmd,$id)=split(/:/,$userinput);
1370: chomp($id);
1371: $id=~s/\W/\_/g;
1372: my $store;
1373: my $execdir=$perlvar{'lonDaemons'};
1374: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
1375: my $reply=<$store>;
1376: print $client "$reply\n";
1377: close $store;
1378: }
1379: else {
1380: print $client "error:$!\n";
1381: }
1382:
1383: # -------------------------------------------------------------------------- ls
1384: } elsif ($userinput =~ /^ls/) {
1385: my ($cmd,$ulsdir)=split(/:/,$userinput);
1386: my $ulsout='';
1387: my $ulsfn;
1388: if (-e $ulsdir) {
1389: if (opendir(LSDIR,$ulsdir)) {
1390: while ($ulsfn=readdir(LSDIR)) {
1391: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1392: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1393: }
1394: closedir(LSDIR);
1395: }
1396: } else {
1397: $ulsout='no_such_dir';
1398: }
1399: if ($ulsout eq '') { $ulsout='empty'; }
1400: print $client "$ulsout\n";
1401: # ------------------------------------------------------------------ Hanging up
1402: } elsif (($userinput =~ /^exit/) ||
1403: ($userinput =~ /^init/)) {
1404: &logthis(
1405: "Client $clientip ($hostid{$clientip}) hanging up: $userinput");
1406: print $client "bye\n";
1407: $client->close();
1408: last;
1409: # ------------------------------------------------------------- unknown command
1410: } else {
1411: # unknown command
1412: print $client "unknown_cmd\n";
1413: }
1414: # -------------------------------------------------------------------- complete
1415: alarm(0);
1416: &status('Listening to '.$hostid{$clientip});
1417: }
1418: # --------------------------------------------- client unknown or fishy, refuse
1419: } else {
1420: print $client "refused\n";
1421: $client->close();
1422: &logthis("<font color=blue>WARNING: "
1423: ."Rejected client $clientip, closing connection</font>");
1424: }
1425: &logthis("<font color=red>CRITICAL: "
1426: ."Disconnect from $clientip ($hostid{$clientip})</font>");
1427: # =============================================================================
1428: }
1429:
1430: # tidy up gracefully and finish
1431:
1432: $server->close();
1433:
1434: # this exit is VERY important, otherwise the child will become
1435: # a producer of more and more children, forking yourself into
1436: # process death.
1437: exit;
1438: }
1439: }
1440:
1441: # ----------------------------------- POD (plain old documentation, CPAN style)
1442:
1443: =head1 NAME
1444:
1445: lond - "LON Daemon" Server (port "LOND" 5663)
1446:
1447: =head1 SYNOPSIS
1448:
1449: Usage: B<lond>
1450:
1451: Should only be run as user=www. This is a command-line script which
1452: is invoked by B<loncron>. There is no expectation that a typical user
1453: will manually start B<lond> from the command-line. (In other words,
1454: DO NOT START B<lond> YOURSELF.)
1455:
1456: =head1 DESCRIPTION
1457:
1458: There are two characteristics associated with the running of B<lond>,
1459: PROCESS MANAGEMENT (starting, stopping, handling child processes)
1460: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
1461: subscriptions, etc). These are described in two large
1462: sections below.
1463:
1464: B<PROCESS MANAGEMENT>
1465:
1466: Preforker - server who forks first. Runs as a daemon. HUPs.
1467: Uses IDEA encryption
1468:
1469: B<lond> forks off children processes that correspond to the other servers
1470: in the network. Management of these processes can be done at the
1471: parent process level or the child process level.
1472:
1473: B<logs/lond.log> is the location of log messages.
1474:
1475: The process management is now explained in terms of linux shell commands,
1476: subroutines internal to this code, and signal assignments:
1477:
1478: =over 4
1479:
1480: =item *
1481:
1482: PID is stored in B<logs/lond.pid>
1483:
1484: This is the process id number of the parent B<lond> process.
1485:
1486: =item *
1487:
1488: SIGTERM and SIGINT
1489:
1490: Parent signal assignment:
1491: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
1492:
1493: Child signal assignment:
1494: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
1495: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
1496: to restart a new child.)
1497:
1498: Command-line invocations:
1499: B<kill> B<-s> SIGTERM I<PID>
1500: B<kill> B<-s> SIGINT I<PID>
1501:
1502: Subroutine B<HUNTSMAN>:
1503: This is only invoked for the B<lond> parent I<PID>.
1504: This kills all the children, and then the parent.
1505: The B<lonc.pid> file is cleared.
1506:
1507: =item *
1508:
1509: SIGHUP
1510:
1511: Current bug:
1512: This signal can only be processed the first time
1513: on the parent process. Subsequent SIGHUP signals
1514: have no effect.
1515:
1516: Parent signal assignment:
1517: $SIG{HUP} = \&HUPSMAN;
1518:
1519: Child signal assignment:
1520: none (nothing happens)
1521:
1522: Command-line invocations:
1523: B<kill> B<-s> SIGHUP I<PID>
1524:
1525: Subroutine B<HUPSMAN>:
1526: This is only invoked for the B<lond> parent I<PID>,
1527: This kills all the children, and then the parent.
1528: The B<lond.pid> file is cleared.
1529:
1530: =item *
1531:
1532: SIGUSR1
1533:
1534: Parent signal assignment:
1535: $SIG{USR1} = \&USRMAN;
1536:
1537: Child signal assignment:
1538: $SIG{USR1}= \&logstatus;
1539:
1540: Command-line invocations:
1541: B<kill> B<-s> SIGUSR1 I<PID>
1542:
1543: Subroutine B<USRMAN>:
1544: When invoked for the B<lond> parent I<PID>,
1545: SIGUSR1 is sent to all the children, and the status of
1546: each connection is logged.
1547:
1548: =item *
1549:
1550: SIGCHLD
1551:
1552: Parent signal assignment:
1553: $SIG{CHLD} = \&REAPER;
1554:
1555: Child signal assignment:
1556: none
1557:
1558: Command-line invocations:
1559: B<kill> B<-s> SIGCHLD I<PID>
1560:
1561: Subroutine B<REAPER>:
1562: This is only invoked for the B<lond> parent I<PID>.
1563: Information pertaining to the child is removed.
1564: The socket port is cleaned up.
1565:
1566: =back
1567:
1568: B<SERVER-SIDE ACTIVITIES>
1569:
1570: Server-side information can be accepted in an encrypted or non-encrypted
1571: method.
1572:
1573: =over 4
1574:
1575: =item ping
1576:
1577: Query a client in the hosts.tab table; "Are you there?"
1578:
1579: =item pong
1580:
1581: Respond to a ping query.
1582:
1583: =item ekey
1584:
1585: Read in encrypted key, make cipher. Respond with a buildkey.
1586:
1587: =item load
1588:
1589: Respond with CPU load based on a computation upon /proc/loadavg.
1590:
1591: =item currentauth
1592:
1593: Reply with current authentication information (only over an
1594: encrypted channel).
1595:
1596: =item auth
1597:
1598: Only over an encrypted channel, reply as to whether a user's
1599: authentication information can be validated.
1600:
1601: =item passwd
1602:
1603: Allow for a password to be set.
1604:
1605: =item makeuser
1606:
1607: Make a user.
1608:
1609: =item passwd
1610:
1611: Allow for authentication mechanism and password to be changed.
1612:
1613: =item home
1614:
1615: Respond to a question "are you the home for a given user?"
1616:
1617: =item update
1618:
1619: Update contents of a subscribed resource.
1620:
1621: =item unsubscribe
1622:
1623: The server is unsubscribing from a resource.
1624:
1625: =item subscribe
1626:
1627: The server is subscribing to a resource.
1628:
1629: =item log
1630:
1631: Place in B<logs/lond.log>
1632:
1633: =item put
1634:
1635: stores hash in namespace
1636:
1637: =item rolesput
1638:
1639: put a role into a user's environment
1640:
1641: =item get
1642:
1643: returns hash with keys from array
1644: reference filled in from namespace
1645:
1646: =item eget
1647:
1648: returns hash with keys from array
1649: reference filled in from namesp (encrypts the return communication)
1650:
1651: =item rolesget
1652:
1653: get a role from a user's environment
1654:
1655: =item del
1656:
1657: deletes keys out of array from namespace
1658:
1659: =item keys
1660:
1661: returns namespace keys
1662:
1663: =item dump
1664:
1665: dumps the complete (or key matching regexp) namespace into a hash
1666:
1667: =item store
1668:
1669: stores hash permanently
1670: for this url; hashref needs to be given and should be a \%hashname; the
1671: remaining args aren't required and if they aren't passed or are '' they will
1672: be derived from the ENV
1673:
1674: =item restore
1675:
1676: returns a hash for a given url
1677:
1678: =item querysend
1679:
1680: Tells client about the lonsql process that has been launched in response
1681: to a sent query.
1682:
1683: =item queryreply
1684:
1685: Accept information from lonsql and make appropriate storage in temporary
1686: file space.
1687:
1688: =item idput
1689:
1690: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
1691: for each student, defined perhaps by the institutional Registrar.)
1692:
1693: =item idget
1694:
1695: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
1696: for each student, defined perhaps by the institutional Registrar.)
1697:
1698: =item tmpput
1699:
1700: Accept and store information in temporary space.
1701:
1702: =item tmpget
1703:
1704: Send along temporarily stored information.
1705:
1706: =item ls
1707:
1708: List part of a user's directory.
1709:
1710: =item Hanging up (exit or init)
1711:
1712: What to do when a client tells the server that they (the client)
1713: are leaving the network.
1714:
1715: =item unknown command
1716:
1717: If B<lond> is sent an unknown command (not in the list above),
1718: it replys to the client "unknown_cmd".
1719:
1720: =item UNKNOWN CLIENT
1721:
1722: If the anti-spoofing algorithm cannot verify the client,
1723: the client is rejected (with a "refused" message sent
1724: to the client, and the connection is closed.
1725:
1726: =back
1727:
1728: =head1 PREREQUISITES
1729:
1730: IO::Socket
1731: IO::File
1732: Apache::File
1733: Symbol
1734: POSIX
1735: Crypt::IDEA
1736: LWP::UserAgent()
1737: GDBM_File
1738: Authen::Krb4
1739:
1740: =head1 COREQUISITES
1741:
1742: =head1 OSNAMES
1743:
1744: linux
1745:
1746: =head1 SCRIPT CATEGORIES
1747:
1748: Server/Process
1749:
1750: =cut
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