1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.75 2002/03/27 04:07:02 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 $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 = 50; # 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 5;
305: if (-e "$peerfile") { return; }
306: &logthis("$peerfile still not there, give it another try");
307: sleep 10;
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: &logthis("sub reply: answer != server");
346: &reconlonc("$perlvar{'lonSockDir'}/$server");
347: }
348: $answer=subreply($cmd,$server);
349: }
350: } else {
351: $answer='self_reply';
352: }
353: return $answer;
354: }
355:
356: # -------------------------------------------------------------- Talk to lonsql
357:
358: sub sqlreply {
359: my ($cmd)=@_;
360: my $answer=subsqlreply($cmd);
361: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
362: return $answer;
363: }
364:
365: sub subsqlreply {
366: my ($cmd)=@_;
367: my $unixsock="mysqlsock";
368: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
369: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
370: Type => SOCK_STREAM,
371: Timeout => 10)
372: or return "con_lost";
373: print $sclient "$cmd\n";
374: my $answer=<$sclient>;
375: chomp($answer);
376: if (!$answer) { $answer="con_lost"; }
377: return $answer;
378: }
379:
380: # -------------------------------------------- Return path to profile directory
381:
382: sub propath {
383: my ($udom,$uname)=@_;
384: $udom=~s/\W//g;
385: $uname=~s/\W//g;
386: my $subdir=$uname.'__';
387: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
388: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
389: return $proname;
390: }
391:
392: # --------------------------------------- Is this the home server of an author?
393:
394: sub ishome {
395: my $author=shift;
396: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
397: my ($udom,$uname)=split(/\//,$author);
398: my $proname=propath($udom,$uname);
399: if (-e $proname) {
400: return 'owner';
401: } else {
402: return 'not_owner';
403: }
404: }
405:
406: # ======================================================= Continue main program
407: # ---------------------------------------------------- Fork once and dissociate
408:
409: $fpid=fork;
410: exit if $fpid;
411: die "Couldn't fork: $!" unless defined ($fpid);
412:
413: POSIX::setsid() or die "Can't start new session: $!";
414:
415: # ------------------------------------------------------- Write our PID on disk
416:
417: $execdir=$perlvar{'lonDaemons'};
418: open (PIDSAVE,">$execdir/logs/lond.pid");
419: print PIDSAVE "$$\n";
420: close(PIDSAVE);
421: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
422: &status('Starting');
423:
424: # ------------------------------------------------------- Now we are on our own
425:
426: # Fork off our children.
427: for (1 .. $PREFORK) {
428: make_new_child();
429: }
430:
431: # ----------------------------------------------------- Install signal handlers
432:
433: &status('Forked children');
434:
435: $SIG{CHLD} = \&REAPER;
436: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
437: $SIG{HUP} = \&HUPSMAN;
438: $SIG{USR1} = \&checkchildren;
439:
440: # And maintain the population.
441: while (1) {
442: &status('Sleeping');
443: sleep; # wait for a signal (i.e., child's death)
444: &logthis('Woke up');
445: &status('Woke up');
446: for ($i = $children; $i < $PREFORK; $i++) {
447: make_new_child(); # top up the child pool
448: }
449: }
450:
451: sub make_new_child {
452: my $pid;
453: my $cipher;
454: my $sigset;
455: &logthis("Attempting to start child");
456: # block signal for fork
457: $sigset = POSIX::SigSet->new(SIGINT);
458: sigprocmask(SIG_BLOCK, $sigset)
459: or die "Can't block SIGINT for fork: $!\n";
460:
461: die "fork: $!" unless defined ($pid = fork);
462:
463: if ($pid) {
464: # Parent records the child's birth and returns.
465: sigprocmask(SIG_UNBLOCK, $sigset)
466: or die "Can't unblock SIGINT for fork: $!\n";
467: $children{$pid} = 1;
468: $children++;
469: &status('Started child '.$pid);
470: return;
471: } else {
472: # Child can *not* return from this subroutine.
473: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
474: $SIG{USR1}= \&logstatus;
475: $SIG{ALRM}= \&timeout;
476: $lastlog='Forked ';
477: $status='Forked';
478:
479: # unblock signals
480: sigprocmask(SIG_UNBLOCK, $sigset)
481: or die "Can't unblock SIGINT for fork: $!\n";
482:
483: $tmpsnum=0;
484:
485: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
486: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
487: &status('Idle, waiting for connection');
488: $client = $server->accept() or last;
489: &status('Accepted connection');
490: # =============================================================================
491: # do something with the connection
492: # -----------------------------------------------------------------------------
493: # see if we know client and check for spoof IP by challenge
494: my $caller=getpeername($client);
495: my ($port,$iaddr)=unpack_sockaddr_in($caller);
496: my $clientip=inet_ntoa($iaddr);
497: my $clientrec=($hostid{$clientip} ne undef);
498: &logthis(
499: "<font color=yellow>INFO: Connection $i, $clientip ($hostid{$clientip})</font>"
500: );
501: &status("Connecting $clientip ($hostid{$clientip})");
502: my $clientok;
503: if ($clientrec) {
504: &status("Waiting for init from $clientip ($hostid{$clientip})");
505: my $remotereq=<$client>;
506: $remotereq=~s/\W//g;
507: if ($remotereq eq 'init') {
508: my $challenge="$$".time;
509: print $client "$challenge\n";
510: &status(
511: "Waiting for challenge reply from $clientip ($hostid{$clientip})");
512: $remotereq=<$client>;
513: $remotereq=~s/\W//g;
514: if ($challenge eq $remotereq) {
515: $clientok=1;
516: print $client "ok\n";
517: } else {
518: &logthis(
519: "<font color=blue>WARNING: $clientip did not reply challenge</font>");
520: &status('No challenge reply '.$clientip);
521: }
522: } else {
523: &logthis(
524: "<font color=blue>WARNING: "
525: ."$clientip failed to initialize: >$remotereq< </font>");
526: &status('No init '.$clientip);
527: }
528: } else {
529: &logthis(
530: "<font color=blue>WARNING: Unknown client $clientip</font>");
531: &status('Hung up on '.$clientip);
532: }
533: if ($clientok) {
534: # ---------------- New known client connecting, could mean machine online again
535:
536: # &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
537: &logthis(
538: "<font color=green>Established connection: $hostid{$clientip}</font>");
539: &status('Will listen to '.$hostid{$clientip});
540: # ------------------------------------------------------------ Process requests
541: while (my $userinput=<$client>) {
542: chomp($userinput);
543: &status('Processing '.$hostid{$clientip}.': '.$userinput);
544: my $wasenc=0;
545: alarm(120);
546: # ------------------------------------------------------------ See if encrypted
547: if ($userinput =~ /^enc/) {
548: if ($cipher) {
549: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
550: $userinput='';
551: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
552: $userinput.=
553: $cipher->decrypt(
554: pack("H16",substr($encinput,$encidx,16))
555: );
556: }
557: $userinput=substr($userinput,0,$cmdlength);
558: $wasenc=1;
559: }
560: }
561:
562: # ------------------------------------------------------------- Normal commands
563: # ------------------------------------------------------------------------ ping
564: if ($userinput =~ /^ping/) {
565: print $client "$perlvar{'lonHostID'}\n";
566: # ------------------------------------------------------------------------ pong
567: } elsif ($userinput =~ /^pong/) {
568: $reply=reply("ping",$hostid{$clientip});
569: print $client "$perlvar{'lonHostID'}:$reply\n";
570: # ------------------------------------------------------------------------ ekey
571: } elsif ($userinput =~ /^ekey/) {
572: my $buildkey=time.$$.int(rand 100000);
573: $buildkey=~tr/1-6/A-F/;
574: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
575: my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
576: $key=~tr/a-z/A-Z/;
577: $key=~tr/G-P/0-9/;
578: $key=~tr/Q-Z/0-9/;
579: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
580: $key=substr($key,0,32);
581: my $cipherkey=pack("H32",$key);
582: $cipher=new IDEA $cipherkey;
583: print $client "$buildkey\n";
584: # ------------------------------------------------------------------------ load
585: } elsif ($userinput =~ /^load/) {
586: my $loadavg;
587: {
588: my $loadfile=IO::File->new('/proc/loadavg');
589: $loadavg=<$loadfile>;
590: }
591: $loadavg =~ s/\s.*//g;
592: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
593: print $client "$loadpercent\n";
594: # ----------------------------------------------------------------- currentauth
595: } elsif ($userinput =~ /^currentauth/) {
596: if ($wasenc==1) {
597: my ($cmd,$udom,$uname)=split(/:/,$userinput);
598: my $proname=propath($udom,$uname);
599: my $passfilename="$proname/passwd";
600: if (-e $passfilename) {
601: my $pf = IO::File->new($passfilename);
602: my $realpasswd=<$pf>;
603: chomp($realpasswd);
604: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
605: my $availablecontent='';
606: if ($howpwd eq 'krb4') {
607: $availablecontent=$contentpwd;
608: }
609: print $client "$howpwd:$availablecontent\n";
610: } else {
611: print $client "unknown_user\n";
612: }
613: } else {
614: print $client "refused\n";
615: }
616: # ------------------------------------------------------------------------ auth
617: } elsif ($userinput =~ /^auth/) {
618: if ($wasenc==1) {
619: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
620: chomp($upass);
621: $upass=unescape($upass);
622: my $proname=propath($udom,$uname);
623: my $passfilename="$proname/passwd";
624: if (-e $passfilename) {
625: my $pf = IO::File->new($passfilename);
626: my $realpasswd=<$pf>;
627: chomp($realpasswd);
628: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
629: my $pwdcorrect=0;
630: if ($howpwd eq 'internal') {
631: $pwdcorrect=
632: (crypt($upass,$contentpwd) eq $contentpwd);
633: } elsif ($howpwd eq 'unix') {
634: $contentpwd=(getpwnam($uname))[1];
635: my $pwauth_path="/usr/local/sbin/pwauth";
636: unless ($contentpwd eq 'x') {
637: $pwdcorrect=
638: (crypt($upass,$contentpwd) eq $contentpwd);
639: }
640: elsif (-e $pwauth_path) {
641: open PWAUTH, "|$pwauth_path" or
642: die "Cannot invoke authentication";
643: print PWAUTH "$uname\n$upass\n";
644: close PWAUTH;
645: $pwdcorrect=!$?;
646: }
647: } elsif ($howpwd eq 'krb4') {
648: $null=pack("C",0);
649: unless ($upass=~/$null/) {
650: $pwdcorrect=(
651: Authen::Krb4::get_pw_in_tkt($uname,"",
652: $contentpwd,'krbtgt',$contentpwd,1,
653: $upass) == 0);
654: } else { $pwdcorrect=0; }
655: } elsif ($howpwd eq 'localauth') {
656: $pwdcorrect=&localauth::localauth($uname,$upass,
657: $contentpwd);
658: }
659: if ($pwdcorrect) {
660: print $client "authorized\n";
661: } else {
662: print $client "non_authorized\n";
663: }
664: } else {
665: print $client "unknown_user\n";
666: }
667: } else {
668: print $client "refused\n";
669: }
670: # ---------------------------------------------------------------------- passwd
671: } elsif ($userinput =~ /^passwd/) {
672: if ($wasenc==1) {
673: my
674: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
675: chomp($npass);
676: $upass=&unescape($upass);
677: $npass=&unescape($npass);
678: &logthis("Trying to change password for $uname");
679: my $proname=propath($udom,$uname);
680: my $passfilename="$proname/passwd";
681: if (-e $passfilename) {
682: my $realpasswd;
683: { my $pf = IO::File->new($passfilename);
684: $realpasswd=<$pf>; }
685: chomp($realpasswd);
686: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
687: if ($howpwd eq 'internal') {
688: if (crypt($upass,$contentpwd) eq $contentpwd) {
689: my $salt=time;
690: $salt=substr($salt,6,2);
691: my $ncpass=crypt($npass,$salt);
692: { my $pf = IO::File->new(">$passfilename");
693: print $pf "internal:$ncpass\n"; }
694: &logthis("Result of password change for $uname: pwchange_success");
695: print $client "ok\n";
696: } else {
697: print $client "non_authorized\n";
698: }
699: } elsif ($howpwd eq 'unix') {
700: # Unix means we have to access /etc/password
701: # one way or another.
702: # First: Make sure the current password is
703: # correct
704: $contentpwd=(getpwnam($uname))[1];
705: my $pwdcorrect = "0";
706: my $pwauth_path="/usr/local/sbin/pwauth";
707: unless ($contentpwd eq 'x') {
708: $pwdcorrect=
709: (crypt($upass,$contentpwd) eq $contentpwd);
710: } elsif (-e $pwauth_path) {
711: open PWAUTH, "|$pwauth_path" or
712: die "Cannot invoke authentication";
713: print PWAUTH "$uname\n$upass\n";
714: close PWAUTH;
715: $pwdcorrect=!$?;
716: }
717: if ($pwdcorrect) {
718: my $execdir=$perlvar{'lonDaemons'};
719: my $pf = IO::File->new("|$execdir/lcpasswd");
720: print $pf "$uname\n$npass\n$npass\n";
721: close $pf;
722: my $result = ($?>0 ? 'pwchange_failure'
723: : 'ok');
724: &logthis("Result of password change for $uname: $result");
725: print $client "$result\n";
726: } else {
727: print $client "non_authorized\n";
728: }
729: } else {
730: print $client "auth_mode_error\n";
731: }
732: } else {
733: print $client "unknown_user\n";
734: }
735: } else {
736: print $client "refused\n";
737: }
738: # -------------------------------------------------------------------- makeuser
739: } elsif ($userinput =~ /^makeuser/) {
740: my $oldumask=umask(0077);
741: if ($wasenc==1) {
742: my
743: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
744: chomp($npass);
745: $npass=&unescape($npass);
746: my $proname=propath($udom,$uname);
747: my $passfilename="$proname/passwd";
748: if (-e $passfilename) {
749: print $client "already_exists\n";
750: } elsif ($udom ne $perlvar{'lonDefDomain'}) {
751: print $client "not_right_domain\n";
752: } else {
753: @fpparts=split(/\//,$proname);
754: $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
755: $fperror='';
756: for ($i=3;$i<=$#fpparts;$i++) {
757: $fpnow.='/'.$fpparts[$i];
758: unless (-e $fpnow) {
759: unless (mkdir($fpnow,0777)) {
760: $fperror="error:$!";
761: }
762: }
763: }
764: unless ($fperror) {
765: if ($umode eq 'krb4') {
766: {
767: my $pf = IO::File->new(">$passfilename");
768: print $pf "krb4:$npass\n";
769: }
770: print $client "ok\n";
771: } elsif ($umode eq 'internal') {
772: my $salt=time;
773: $salt=substr($salt,6,2);
774: my $ncpass=crypt($npass,$salt);
775: {
776: my $pf = IO::File->new(">$passfilename");
777: print $pf "internal:$ncpass\n";
778: }
779: print $client "ok\n";
780: } elsif ($umode eq 'localauth') {
781: {
782: my $pf = IO::File->new(">$passfilename");
783: print $pf "localauth:$npass\n";
784: }
785: print $client "ok\n";
786: } elsif ($umode eq 'unix') {
787: {
788: my $execpath="$perlvar{'lonDaemons'}/".
789: "lcuseradd";
790: {
791: my $se = IO::File->new("|$execpath");
792: print $se "$uname\n";
793: print $se "$npass\n";
794: print $se "$npass\n";
795: }
796: my $pf = IO::File->new(">$passfilename");
797: print $pf "unix:\n";
798: }
799: print $client "ok\n";
800: } elsif ($umode eq 'none') {
801: {
802: my $pf = IO::File->new(">$passfilename");
803: print $pf "none:\n";
804: }
805: print $client "ok\n";
806: } else {
807: print $client "auth_mode_error\n";
808: }
809: } else {
810: print $client "$fperror\n";
811: }
812: }
813: } else {
814: print $client "refused\n";
815: }
816: umask($oldumask);
817: # -------------------------------------------------------------- changeuserauth
818: } elsif ($userinput =~ /^changeuserauth/) {
819: if ($wasenc==1) {
820: my
821: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
822: chomp($npass);
823: $npass=&unescape($npass);
824: my $proname=propath($udom,$uname);
825: my $passfilename="$proname/passwd";
826: if ($udom ne $perlvar{'lonDefDomain'}) {
827: print $client "not_right_domain\n";
828: } else {
829: if ($umode eq 'krb4') {
830: {
831: my $pf = IO::File->new(">$passfilename");
832: print $pf "krb4:$npass\n";
833: }
834: print $client "ok\n";
835: } elsif ($umode eq 'internal') {
836: my $salt=time;
837: $salt=substr($salt,6,2);
838: my $ncpass=crypt($npass,$salt);
839: {
840: my $pf = IO::File->new(">$passfilename");
841: print $pf "internal:$ncpass\n";
842: }
843: print $client "ok\n";
844: } elsif ($umode eq 'localauth') {
845: {
846: my $pf = IO::File->new(">$passfilename");
847: print $pf "localauth:$npass\n";
848: }
849: print $client "ok\n";
850: } elsif ($umode eq 'unix') {
851: {
852: my $execpath="$perlvar{'lonDaemons'}/".
853: "lcuseradd";
854: {
855: my $se = IO::File->new("|$execpath");
856: print $se "$uname\n";
857: print $se "$npass\n";
858: print $se "$npass\n";
859: }
860: my $pf = IO::File->new(">$passfilename");
861: print $pf "unix:\n";
862: }
863: print $client "ok\n";
864: } elsif ($umode eq 'none') {
865: {
866: my $pf = IO::File->new(">$passfilename");
867: print $pf "none:\n";
868: }
869: print $client "ok\n";
870: } else {
871: print $client "auth_mode_error\n";
872: }
873: }
874: } else {
875: print $client "refused\n";
876: }
877: # ------------------------------------------------------------------------ home
878: } elsif ($userinput =~ /^home/) {
879: my ($cmd,$udom,$uname)=split(/:/,$userinput);
880: chomp($uname);
881: my $proname=propath($udom,$uname);
882: if (-e $proname) {
883: print $client "found\n";
884: } else {
885: print $client "not_found\n";
886: }
887: # ---------------------------------------------------------------------- update
888: } elsif ($userinput =~ /^update/) {
889: my ($cmd,$fname)=split(/:/,$userinput);
890: my $ownership=ishome($fname);
891: if ($ownership eq 'not_owner') {
892: if (-e $fname) {
893: my ($dev,$ino,$mode,$nlink,
894: $uid,$gid,$rdev,$size,
895: $atime,$mtime,$ctime,
896: $blksize,$blocks)=stat($fname);
897: $now=time;
898: $since=$now-$atime;
899: if ($since>$perlvar{'lonExpire'}) {
900: $reply=
901: reply("unsub:$fname","$hostid{$clientip}");
902: unlink("$fname");
903: } else {
904: my $transname="$fname.in.transfer";
905: my $remoteurl=
906: reply("sub:$fname","$hostid{$clientip}");
907: my $response;
908: {
909: my $ua=new LWP::UserAgent;
910: my $request=new HTTP::Request('GET',"$remoteurl");
911: $response=$ua->request($request,$transname);
912: }
913: if ($response->is_error()) {
914: unlink($transname);
915: my $message=$response->status_line;
916: &logthis(
917: "LWP GET: $message for $fname ($remoteurl)");
918: } else {
919: if ($remoteurl!~/\.meta$/) {
920: my $ua=new LWP::UserAgent;
921: my $mrequest=
922: new HTTP::Request('GET',$remoteurl.'.meta');
923: my $mresponse=
924: $ua->request($mrequest,$fname.'.meta');
925: if ($mresponse->is_error()) {
926: unlink($fname.'.meta');
927: }
928: }
929: rename($transname,$fname);
930: }
931: }
932: print $client "ok\n";
933: } else {
934: print $client "not_found\n";
935: }
936: } else {
937: print $client "rejected\n";
938: }
939: # ----------------------------------------------------------------- unsubscribe
940: } elsif ($userinput =~ /^unsub/) {
941: my ($cmd,$fname)=split(/:/,$userinput);
942: if (-e $fname) {
943: if (unlink("$fname.$hostid{$clientip}")) {
944: print $client "ok\n";
945: } else {
946: print $client "not_subscribed\n";
947: }
948: } else {
949: print $client "not_found\n";
950: }
951: # ------------------------------------------------------------------- subscribe
952: } elsif ($userinput =~ /^sub/) {
953: my ($cmd,$fname)=split(/:/,$userinput);
954: my $ownership=ishome($fname);
955: if ($ownership eq 'owner') {
956: if (-e $fname) {
957: if (-d $fname) {
958: print $client "directory\n";
959: } else {
960: $now=time;
961: {
962: my $sh;
963: if ($sh=
964: IO::File->new(">$fname.$hostid{$clientip}")) {
965: print $sh "$clientip:$now\n";
966: }
967: }
968: unless ($fname=~/\.meta$/) {
969: unlink("$fname.meta.$hostid{$clientip}");
970: }
971: $fname=~s/\/home\/httpd\/html\/res/raw/;
972: $fname="http://$thisserver/".$fname;
973: print $client "$fname\n";
974: }
975: } else {
976: print $client "not_found\n";
977: }
978: } else {
979: print $client "rejected\n";
980: }
981: # ------------------------------------------------------------------------- log
982: } elsif ($userinput =~ /^log/) {
983: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
984: chomp($what);
985: my $proname=propath($udom,$uname);
986: my $now=time;
987: {
988: my $hfh;
989: if ($hfh=IO::File->new(">>$proname/activity.log")) {
990: print $hfh "$now:$hostid{$clientip}:$what\n";
991: print $client "ok\n";
992: } else {
993: print $client "error:$!\n";
994: }
995: }
996: # ------------------------------------------------------------------------- put
997: } elsif ($userinput =~ /^put/) {
998: my ($cmd,$udom,$uname,$namespace,$what)
999: =split(/:/,$userinput);
1000: $namespace=~s/\//\_/g;
1001: $namespace=~s/\W//g;
1002: if ($namespace ne 'roles') {
1003: chomp($what);
1004: my $proname=propath($udom,$uname);
1005: my $now=time;
1006: unless ($namespace=~/^nohist\_/) {
1007: my $hfh;
1008: if (
1009: $hfh=IO::File->new(">>$proname/$namespace.hist")
1010: ) { print $hfh "P:$now:$what\n"; }
1011: }
1012: my @pairs=split(/\&/,$what);
1013: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1014: foreach $pair (@pairs) {
1015: ($key,$value)=split(/=/,$pair);
1016: $hash{$key}=$value;
1017: }
1018: if (untie(%hash)) {
1019: print $client "ok\n";
1020: } else {
1021: print $client "error:$!\n";
1022: }
1023: } else {
1024: print $client "error:$!\n";
1025: }
1026: } else {
1027: print $client "refused\n";
1028: }
1029: # -------------------------------------------------------------------- rolesput
1030: } elsif ($userinput =~ /^rolesput/) {
1031: if ($wasenc==1) {
1032: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
1033: =split(/:/,$userinput);
1034: my $namespace='roles';
1035: chomp($what);
1036: my $proname=propath($udom,$uname);
1037: my $now=time;
1038: {
1039: my $hfh;
1040: if (
1041: $hfh=IO::File->new(">>$proname/$namespace.hist")
1042: ) {
1043: print $hfh "P:$now:$exedom:$exeuser:$what\n";
1044: }
1045: }
1046: my @pairs=split(/\&/,$what);
1047: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1048: foreach $pair (@pairs) {
1049: ($key,$value)=split(/=/,$pair);
1050: $hash{$key}=$value;
1051: }
1052: if (untie(%hash)) {
1053: print $client "ok\n";
1054: } else {
1055: print $client "error:$!\n";
1056: }
1057: } else {
1058: print $client "error:$!\n";
1059: }
1060: } else {
1061: print $client "refused\n";
1062: }
1063: # ------------------------------------------------------------------------- get
1064: } elsif ($userinput =~ /^get/) {
1065: my ($cmd,$udom,$uname,$namespace,$what)
1066: =split(/:/,$userinput);
1067: $namespace=~s/\//\_/g;
1068: $namespace=~s/\W//g;
1069: chomp($what);
1070: my @queries=split(/\&/,$what);
1071: my $proname=propath($udom,$uname);
1072: my $qresult='';
1073: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1074: for ($i=0;$i<=$#queries;$i++) {
1075: $qresult.="$hash{$queries[$i]}&";
1076: }
1077: if (untie(%hash)) {
1078: $qresult=~s/\&$//;
1079: print $client "$qresult\n";
1080: } else {
1081: print $client "error:$!\n";
1082: }
1083: } else {
1084: print $client "error:$!\n";
1085: }
1086: # ------------------------------------------------------------------------ eget
1087: } elsif ($userinput =~ /^eget/) {
1088: my ($cmd,$udom,$uname,$namespace,$what)
1089: =split(/:/,$userinput);
1090: $namespace=~s/\//\_/g;
1091: $namespace=~s/\W//g;
1092: chomp($what);
1093: my @queries=split(/\&/,$what);
1094: my $proname=propath($udom,$uname);
1095: my $qresult='';
1096: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1097: for ($i=0;$i<=$#queries;$i++) {
1098: $qresult.="$hash{$queries[$i]}&";
1099: }
1100: if (untie(%hash)) {
1101: $qresult=~s/\&$//;
1102: if ($cipher) {
1103: my $cmdlength=length($qresult);
1104: $qresult.=" ";
1105: my $encqresult='';
1106: for
1107: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
1108: $encqresult.=
1109: unpack("H16",
1110: $cipher->encrypt(substr($qresult,$encidx,8)));
1111: }
1112: print $client "enc:$cmdlength:$encqresult\n";
1113: } else {
1114: print $client "error:no_key\n";
1115: }
1116: } else {
1117: print $client "error:$!\n";
1118: }
1119: } else {
1120: print $client "error:$!\n";
1121: }
1122: # ------------------------------------------------------------------------- del
1123: } elsif ($userinput =~ /^del/) {
1124: my ($cmd,$udom,$uname,$namespace,$what)
1125: =split(/:/,$userinput);
1126: $namespace=~s/\//\_/g;
1127: $namespace=~s/\W//g;
1128: chomp($what);
1129: my $proname=propath($udom,$uname);
1130: my $now=time;
1131: unless ($namespace=~/^nohist\_/) {
1132: my $hfh;
1133: if (
1134: $hfh=IO::File->new(">>$proname/$namespace.hist")
1135: ) { print $hfh "D:$now:$what\n"; }
1136: }
1137: my @keys=split(/\&/,$what);
1138: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1139: foreach $key (@keys) {
1140: delete($hash{$key});
1141: }
1142: if (untie(%hash)) {
1143: print $client "ok\n";
1144: } else {
1145: print $client "error:$!\n";
1146: }
1147: } else {
1148: print $client "error:$!\n";
1149: }
1150: # ------------------------------------------------------------------------ keys
1151: } elsif ($userinput =~ /^keys/) {
1152: my ($cmd,$udom,$uname,$namespace)
1153: =split(/:/,$userinput);
1154: $namespace=~s/\//\_/g;
1155: $namespace=~s/\W//g;
1156: my $proname=propath($udom,$uname);
1157: my $qresult='';
1158: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1159: foreach $key (keys %hash) {
1160: $qresult.="$key&";
1161: }
1162: if (untie(%hash)) {
1163: $qresult=~s/\&$//;
1164: print $client "$qresult\n";
1165: } else {
1166: print $client "error:$!\n";
1167: }
1168: } else {
1169: print $client "error:$!\n";
1170: }
1171: # ------------------------------------------------------------------------ dump
1172: } elsif ($userinput =~ /^dump/) {
1173: my ($cmd,$udom,$uname,$namespace,$regexp)
1174: =split(/:/,$userinput);
1175: $namespace=~s/\//\_/g;
1176: $namespace=~s/\W//g;
1177: if (defined($regexp)) {
1178: $regexp=&unescape($regexp);
1179: } else {
1180: $regexp='.';
1181: }
1182: my $proname=propath($udom,$uname);
1183: my $qresult='';
1184: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1185: foreach $key (keys %hash) {
1186: if (eval('$key=~/$regexp/')) {
1187: $qresult.="$key=$hash{$key}&";
1188: }
1189: }
1190: if (untie(%hash)) {
1191: $qresult=~s/\&$//;
1192: print $client "$qresult\n";
1193: } else {
1194: print $client "error:$!\n";
1195: }
1196: } else {
1197: print $client "error:$!\n";
1198: }
1199: # ----------------------------------------------------------------------- store
1200: } elsif ($userinput =~ /^store/) {
1201: my ($cmd,$udom,$uname,$namespace,$rid,$what)
1202: =split(/:/,$userinput);
1203: $namespace=~s/\//\_/g;
1204: $namespace=~s/\W//g;
1205: if ($namespace ne 'roles') {
1206: chomp($what);
1207: my $proname=propath($udom,$uname);
1208: my $now=time;
1209: unless ($namespace=~/^nohist\_/) {
1210: my $hfh;
1211: if (
1212: $hfh=IO::File->new(">>$proname/$namespace.hist")
1213: ) { print $hfh "P:$now:$rid:$what\n"; }
1214: }
1215: my @pairs=split(/\&/,$what);
1216:
1217: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1218: my @previouskeys=split(/&/,$hash{"keys:$rid"});
1219: my $key;
1220: $hash{"version:$rid"}++;
1221: my $version=$hash{"version:$rid"};
1222: my $allkeys='';
1223: foreach $pair (@pairs) {
1224: ($key,$value)=split(/=/,$pair);
1225: $allkeys.=$key.':';
1226: $hash{"$version:$rid:$key"}=$value;
1227: }
1228: $hash{"$version:$rid:timestamp"}=$now;
1229: $allkeys.='timestamp';
1230: $hash{"$version:keys:$rid"}=$allkeys;
1231: if (untie(%hash)) {
1232: print $client "ok\n";
1233: } else {
1234: print $client "error:$!\n";
1235: }
1236: } else {
1237: print $client "error:$!\n";
1238: }
1239: } else {
1240: print $client "refused\n";
1241: }
1242: # --------------------------------------------------------------------- restore
1243: } elsif ($userinput =~ /^restore/) {
1244: my ($cmd,$udom,$uname,$namespace,$rid)
1245: =split(/:/,$userinput);
1246: $namespace=~s/\//\_/g;
1247: $namespace=~s/\W//g;
1248: chomp($rid);
1249: my $proname=propath($udom,$uname);
1250: my $qresult='';
1251: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1252: my $version=$hash{"version:$rid"};
1253: $qresult.="version=$version&";
1254: my $scope;
1255: for ($scope=1;$scope<=$version;$scope++) {
1256: my $vkeys=$hash{"$scope:keys:$rid"};
1257: my @keys=split(/:/,$vkeys);
1258: my $key;
1259: $qresult.="$scope:keys=$vkeys&";
1260: foreach $key (@keys) {
1261: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
1262: }
1263: }
1264: if (untie(%hash)) {
1265: $qresult=~s/\&$//;
1266: print $client "$qresult\n";
1267: } else {
1268: print $client "error:$!\n";
1269: }
1270: } else {
1271: print $client "error:$!\n";
1272: }
1273: # ------------------------------------------------------------------- querysend
1274: } elsif ($userinput =~ /^querysend/) {
1275: my ($cmd,$query,
1276: $custom,$customshow)=split(/:/,$userinput);
1277: $query=~s/\n*$//g;
1278: unless ($custom or $customshow) {
1279: print $client "".
1280: sqlreply("$hostid{$clientip}\&$query")."\n";
1281: }
1282: else {
1283: print $client "".
1284: sqlreply("$hostid{$clientip}\&$query".
1285: "\&$custom"."\&$customshow")."\n";
1286: }
1287: # ------------------------------------------------------------------ queryreply
1288: } elsif ($userinput =~ /^queryreply/) {
1289: my ($cmd,$id,$reply)=split(/:/,$userinput);
1290: my $store;
1291: my $execdir=$perlvar{'lonDaemons'};
1292: if ($store=IO::File->new(">$execdir/tmp/$id")) {
1293: $reply=~s/\&/\n/g;
1294: print $store $reply;
1295: close $store;
1296: my $store2=IO::File->new(">$execdir/tmp/$id.end");
1297: print $store2 "done\n";
1298: close $store2;
1299: print $client "ok\n";
1300: }
1301: else {
1302: print $client "error:$!\n";
1303: }
1304: # ----------------------------------------------------------------------- idput
1305: } elsif ($userinput =~ /^idput/) {
1306: my ($cmd,$udom,$what)=split(/:/,$userinput);
1307: chomp($what);
1308: $udom=~s/\W//g;
1309: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1310: my $now=time;
1311: {
1312: my $hfh;
1313: if (
1314: $hfh=IO::File->new(">>$proname.hist")
1315: ) { print $hfh "P:$now:$what\n"; }
1316: }
1317: my @pairs=split(/\&/,$what);
1318: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT,0640)) {
1319: foreach $pair (@pairs) {
1320: ($key,$value)=split(/=/,$pair);
1321: $hash{$key}=$value;
1322: }
1323: if (untie(%hash)) {
1324: print $client "ok\n";
1325: } else {
1326: print $client "error:$!\n";
1327: }
1328: } else {
1329: print $client "error:$!\n";
1330: }
1331: # ----------------------------------------------------------------------- idget
1332: } elsif ($userinput =~ /^idget/) {
1333: my ($cmd,$udom,$what)=split(/:/,$userinput);
1334: chomp($what);
1335: $udom=~s/\W//g;
1336: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1337: my @queries=split(/\&/,$what);
1338: my $qresult='';
1339: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER,0640)) {
1340: for ($i=0;$i<=$#queries;$i++) {
1341: $qresult.="$hash{$queries[$i]}&";
1342: }
1343: if (untie(%hash)) {
1344: $qresult=~s/\&$//;
1345: print $client "$qresult\n";
1346: } else {
1347: print $client "error:$!\n";
1348: }
1349: } else {
1350: print $client "error:$!\n";
1351: }
1352: # ---------------------------------------------------------------------- tmpput
1353: } elsif ($userinput =~ /^tmpput/) {
1354: my ($cmd,$what)=split(/:/,$userinput);
1355: my $store;
1356: $tmpsnum++;
1357: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
1358: $id=~s/\W/\_/g;
1359: $what=~s/\n//g;
1360: my $execdir=$perlvar{'lonDaemons'};
1361: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1362: print $store $what;
1363: close $store;
1364: print $client "$id\n";
1365: }
1366: else {
1367: print $client "error:$!\n";
1368: }
1369:
1370: # ---------------------------------------------------------------------- tmpget
1371: } elsif ($userinput =~ /^tmpget/) {
1372: my ($cmd,$id)=split(/:/,$userinput);
1373: chomp($id);
1374: $id=~s/\W/\_/g;
1375: my $store;
1376: my $execdir=$perlvar{'lonDaemons'};
1377: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
1378: my $reply=<$store>;
1379: print $client "$reply\n";
1380: close $store;
1381: }
1382: else {
1383: print $client "error:$!\n";
1384: }
1385:
1386: # -------------------------------------------------------------------------- ls
1387: } elsif ($userinput =~ /^ls/) {
1388: my ($cmd,$ulsdir)=split(/:/,$userinput);
1389: my $ulsout='';
1390: my $ulsfn;
1391: if (-e $ulsdir) {
1392: if (opendir(LSDIR,$ulsdir)) {
1393: while ($ulsfn=readdir(LSDIR)) {
1394: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1395: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1396: }
1397: closedir(LSDIR);
1398: }
1399: } else {
1400: $ulsout='no_such_dir';
1401: }
1402: if ($ulsout eq '') { $ulsout='empty'; }
1403: print $client "$ulsout\n";
1404: # ------------------------------------------------------------------ Hanging up
1405: } elsif (($userinput =~ /^exit/) ||
1406: ($userinput =~ /^init/)) {
1407: &logthis(
1408: "Client $clientip ($hostid{$clientip}) hanging up: $userinput");
1409: print $client "bye\n";
1410: $client->close();
1411: last;
1412: # ------------------------------------------------------------- unknown command
1413: } else {
1414: # unknown command
1415: print $client "unknown_cmd\n";
1416: }
1417: # -------------------------------------------------------------------- complete
1418: alarm(0);
1419: &status('Listening to '.$hostid{$clientip});
1420: }
1421: # --------------------------------------------- client unknown or fishy, refuse
1422: } else {
1423: print $client "refused\n";
1424: $client->close();
1425: &logthis("<font color=blue>WARNING: "
1426: ."Rejected client $clientip, closing connection</font>");
1427: }
1428: }
1429:
1430: # =============================================================================
1431:
1432: &logthis("<font color=red>CRITICAL: "
1433: ."Disconnect from $clientip ($hostid{$clientip})</font>");
1434: # tidy up gracefully and finish
1435:
1436: $server->close();
1437:
1438: # this exit is VERY important, otherwise the child will become
1439: # a producer of more and more children, forking yourself into
1440: # process death.
1441: exit;
1442: }
1443: }
1444:
1445: # ----------------------------------- POD (plain old documentation, CPAN style)
1446:
1447: =head1 NAME
1448:
1449: lond - "LON Daemon" Server (port "LOND" 5663)
1450:
1451: =head1 SYNOPSIS
1452:
1453: Usage: B<lond>
1454:
1455: Should only be run as user=www. This is a command-line script which
1456: is invoked by B<loncron>. There is no expectation that a typical user
1457: will manually start B<lond> from the command-line. (In other words,
1458: DO NOT START B<lond> YOURSELF.)
1459:
1460: =head1 DESCRIPTION
1461:
1462: There are two characteristics associated with the running of B<lond>,
1463: PROCESS MANAGEMENT (starting, stopping, handling child processes)
1464: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
1465: subscriptions, etc). These are described in two large
1466: sections below.
1467:
1468: B<PROCESS MANAGEMENT>
1469:
1470: Preforker - server who forks first. Runs as a daemon. HUPs.
1471: Uses IDEA encryption
1472:
1473: B<lond> forks off children processes that correspond to the other servers
1474: in the network. Management of these processes can be done at the
1475: parent process level or the child process level.
1476:
1477: B<logs/lond.log> is the location of log messages.
1478:
1479: The process management is now explained in terms of linux shell commands,
1480: subroutines internal to this code, and signal assignments:
1481:
1482: =over 4
1483:
1484: =item *
1485:
1486: PID is stored in B<logs/lond.pid>
1487:
1488: This is the process id number of the parent B<lond> process.
1489:
1490: =item *
1491:
1492: SIGTERM and SIGINT
1493:
1494: Parent signal assignment:
1495: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
1496:
1497: Child signal assignment:
1498: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
1499: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
1500: to restart a new child.)
1501:
1502: Command-line invocations:
1503: B<kill> B<-s> SIGTERM I<PID>
1504: B<kill> B<-s> SIGINT I<PID>
1505:
1506: Subroutine B<HUNTSMAN>:
1507: This is only invoked for the B<lond> parent I<PID>.
1508: This kills all the children, and then the parent.
1509: The B<lonc.pid> file is cleared.
1510:
1511: =item *
1512:
1513: SIGHUP
1514:
1515: Current bug:
1516: This signal can only be processed the first time
1517: on the parent process. Subsequent SIGHUP signals
1518: have no effect.
1519:
1520: Parent signal assignment:
1521: $SIG{HUP} = \&HUPSMAN;
1522:
1523: Child signal assignment:
1524: none (nothing happens)
1525:
1526: Command-line invocations:
1527: B<kill> B<-s> SIGHUP I<PID>
1528:
1529: Subroutine B<HUPSMAN>:
1530: This is only invoked for the B<lond> parent I<PID>,
1531: This kills all the children, and then the parent.
1532: The B<lond.pid> file is cleared.
1533:
1534: =item *
1535:
1536: SIGUSR1
1537:
1538: Parent signal assignment:
1539: $SIG{USR1} = \&USRMAN;
1540:
1541: Child signal assignment:
1542: $SIG{USR1}= \&logstatus;
1543:
1544: Command-line invocations:
1545: B<kill> B<-s> SIGUSR1 I<PID>
1546:
1547: Subroutine B<USRMAN>:
1548: When invoked for the B<lond> parent I<PID>,
1549: SIGUSR1 is sent to all the children, and the status of
1550: each connection is logged.
1551:
1552: =item *
1553:
1554: SIGCHLD
1555:
1556: Parent signal assignment:
1557: $SIG{CHLD} = \&REAPER;
1558:
1559: Child signal assignment:
1560: none
1561:
1562: Command-line invocations:
1563: B<kill> B<-s> SIGCHLD I<PID>
1564:
1565: Subroutine B<REAPER>:
1566: This is only invoked for the B<lond> parent I<PID>.
1567: Information pertaining to the child is removed.
1568: The socket port is cleaned up.
1569:
1570: =back
1571:
1572: B<SERVER-SIDE ACTIVITIES>
1573:
1574: Server-side information can be accepted in an encrypted or non-encrypted
1575: method.
1576:
1577: =over 4
1578:
1579: =item ping
1580:
1581: Query a client in the hosts.tab table; "Are you there?"
1582:
1583: =item pong
1584:
1585: Respond to a ping query.
1586:
1587: =item ekey
1588:
1589: Read in encrypted key, make cipher. Respond with a buildkey.
1590:
1591: =item load
1592:
1593: Respond with CPU load based on a computation upon /proc/loadavg.
1594:
1595: =item currentauth
1596:
1597: Reply with current authentication information (only over an
1598: encrypted channel).
1599:
1600: =item auth
1601:
1602: Only over an encrypted channel, reply as to whether a user's
1603: authentication information can be validated.
1604:
1605: =item passwd
1606:
1607: Allow for a password to be set.
1608:
1609: =item makeuser
1610:
1611: Make a user.
1612:
1613: =item passwd
1614:
1615: Allow for authentication mechanism and password to be changed.
1616:
1617: =item home
1618:
1619: Respond to a question "are you the home for a given user?"
1620:
1621: =item update
1622:
1623: Update contents of a subscribed resource.
1624:
1625: =item unsubscribe
1626:
1627: The server is unsubscribing from a resource.
1628:
1629: =item subscribe
1630:
1631: The server is subscribing to a resource.
1632:
1633: =item log
1634:
1635: Place in B<logs/lond.log>
1636:
1637: =item put
1638:
1639: stores hash in namespace
1640:
1641: =item rolesput
1642:
1643: put a role into a user's environment
1644:
1645: =item get
1646:
1647: returns hash with keys from array
1648: reference filled in from namespace
1649:
1650: =item eget
1651:
1652: returns hash with keys from array
1653: reference filled in from namesp (encrypts the return communication)
1654:
1655: =item rolesget
1656:
1657: get a role from a user's environment
1658:
1659: =item del
1660:
1661: deletes keys out of array from namespace
1662:
1663: =item keys
1664:
1665: returns namespace keys
1666:
1667: =item dump
1668:
1669: dumps the complete (or key matching regexp) namespace into a hash
1670:
1671: =item store
1672:
1673: stores hash permanently
1674: for this url; hashref needs to be given and should be a \%hashname; the
1675: remaining args aren't required and if they aren't passed or are '' they will
1676: be derived from the ENV
1677:
1678: =item restore
1679:
1680: returns a hash for a given url
1681:
1682: =item querysend
1683:
1684: Tells client about the lonsql process that has been launched in response
1685: to a sent query.
1686:
1687: =item queryreply
1688:
1689: Accept information from lonsql and make appropriate storage in temporary
1690: file space.
1691:
1692: =item idput
1693:
1694: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
1695: for each student, defined perhaps by the institutional Registrar.)
1696:
1697: =item idget
1698:
1699: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
1700: for each student, defined perhaps by the institutional Registrar.)
1701:
1702: =item tmpput
1703:
1704: Accept and store information in temporary space.
1705:
1706: =item tmpget
1707:
1708: Send along temporarily stored information.
1709:
1710: =item ls
1711:
1712: List part of a user's directory.
1713:
1714: =item Hanging up (exit or init)
1715:
1716: What to do when a client tells the server that they (the client)
1717: are leaving the network.
1718:
1719: =item unknown command
1720:
1721: If B<lond> is sent an unknown command (not in the list above),
1722: it replys to the client "unknown_cmd".
1723:
1724: =item UNKNOWN CLIENT
1725:
1726: If the anti-spoofing algorithm cannot verify the client,
1727: the client is rejected (with a "refused" message sent
1728: to the client, and the connection is closed.
1729:
1730: =back
1731:
1732: =head1 PREREQUISITES
1733:
1734: IO::Socket
1735: IO::File
1736: Apache::File
1737: Symbol
1738: POSIX
1739: Crypt::IDEA
1740: LWP::UserAgent()
1741: GDBM_File
1742: Authen::Krb4
1743:
1744: =head1 COREQUISITES
1745:
1746: =head1 OSNAMES
1747:
1748: linux
1749:
1750: =head1 SCRIPT CATEGORIES
1751:
1752: Server/Process
1753:
1754: =cut
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