Annotation of loncom/lonc, revision 1.29
1.1 albertel 1: #!/usr/bin/perl
2:
3: # The LearningOnline Network
4: # lonc - LON TCP-Client Domain-Socket-Server
5: # provides persistent TCP connections to the other servers in the network
6: # through multiplexed domain sockets
7: #
1.29 ! www 8: # $Id: lonc,v 1.28 2002/02/19 22:51:13 www Exp $
1.22 www 9: #
10: # Copyright Michigan State University Board of Trustees
11: #
12: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
13: #
14: # LON-CAPA is free software; you can redistribute it and/or modify
15: # it under the terms of the GNU General Public License as published by
16: # the Free Software Foundation; either version 2 of the License, or
17: # (at your option) any later version.
18: #
19: # LON-CAPA is distributed in the hope that it will be useful,
20: # but WITHOUT ANY WARRANTY; without even the implied warranty of
21: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22: # GNU General Public License for more details.
23: #
24: # You should have received a copy of the GNU General Public License
25: # along with LON-CAPA; if not, write to the Free Software
26: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27: #
28: # /home/httpd/html/adm/gpl.txt
29: #
30: # http://www.lon-capa.org/
31: #
1.1 albertel 32: # PID in subdir logs/lonc.pid
33: # kill kills
34: # HUP restarts
35: # USR1 tries to open connections again
36:
1.2 www 37: # 6/4/99,6/5,6/7,6/8,6/9,6/10,6/11,6/12,7/14,7/19,
1.5 www 38: # 10/8,10/9,10/15,11/18,12/22,
1.10 www 39: # 2/8,7/25 Gerd Kortemeyer
40: # 12/05 Scott Harrison
41: # 12/05 Gerd Kortemeyer
1.23 harris41 42: # YEAR=2001
1.14 www 43: # 01/10/01 Scott Harrison
1.21 www 44: # 03/14/01,03/15,06/12,11/26,11/27,11/28 Gerd Kortemeyer
1.23 harris41 45: # 12/20 Scott Harrison
1.26 www 46: # YEAR=2002
1.29 ! www 47: # 2/19/02,02/22/02,02/25/02 Gerd Kortemeyer
1.10 www 48: #
1.1 albertel 49: # based on nonforker from Perl Cookbook
50: # - server who multiplexes without forking
51:
52: use POSIX;
53: use IO::Socket;
54: use IO::Select;
55: use IO::File;
56: use Socket;
57: use Fcntl;
58: use Tie::RefHash;
59: use Crypt::IDEA;
1.26 www 60: use Net::Ping;
61: use LWP::UserAgent();
1.1 albertel 62:
1.18 www 63: my $status='';
64: my $lastlog='';
65:
1.9 harris41 66: # grabs exception and records it to log before exiting
67: sub catchexception {
68: my ($signal)=@_;
1.29 ! www 69: $SIG{QUIT}='DEFAULT';
1.10 www 70: $SIG{__DIE__}='DEFAULT';
1.29 ! www 71: chomp($signal);
1.9 harris41 72: &logthis("<font color=red>CRITICAL: "
1.29 ! www 73: ."ABNORMAL EXIT. Child $$ for server [$wasserver] died through "
! 74: ."\"$signal\" with parameter [$@]</font>");
1.9 harris41 75: die($@);
76: }
77:
1.17 www 78: $childmaxattempts=5;
1.5 www 79:
1.26 www 80: # -------------------------------------- Routines to see if other box available
81:
82: sub online {
83: my $host=shift;
1.29 ! www 84: &status("Pinging ".$host);
1.27 www 85: my $p=Net::Ping->new("tcp",20);
1.26 www 86: my $online=$p->ping("$host");
87: $p->close();
88: undef ($p);
89: return $online;
90: }
91:
92: sub connected {
93: my ($local,$remote)=@_;
1.29 ! www 94: &status("Checking connection $local to $remote");
1.26 www 95: $local=~s/\W//g;
96: $remote=~s/\W//g;
97:
98: unless ($hostname{$local}) { return 'local_unknown'; }
99: unless ($hostname{$remote}) { return 'remote_unknown'; }
100:
101: unless (&online($hostname{$local})) { return 'local_offline'; }
102:
103: my $ua=new LWP::UserAgent;
104:
105: my $request=new HTTP::Request('GET',
106: "http://".$hostname{$local}.'/cgi-bin/ping.pl?'.$remote);
107:
108: my $response=$ua->request($request);
109:
110: unless ($response->is_success) { return 'local_error'; }
111:
112: my $reply=$response->content;
113: $reply=(split("\n",$reply))[0];
114: $reply=~s/\W//g;
115: if ($reply ne $remote) { return $reply; }
116: return 'ok';
117: }
118:
119:
1.8 harris41 120: # -------------------------------- Set signal handlers to record abnormal exits
121:
1.29 ! www 122: &status("Init exception handlers");
1.26 www 123: $SIG{QUIT}=\&catchexception;
1.8 harris41 124: $SIG{__DIE__}=\&catchexception;
125:
1.1 albertel 126: # ------------------------------------ Read httpd access.conf and get variables
1.29 ! www 127: &status("Read access.conf");
1.11 harris41 128: open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
1.1 albertel 129:
130: while ($configline=<CONFIG>) {
131: if ($configline =~ /PerlSetVar/) {
132: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
1.4 www 133: chomp($varvalue);
1.1 albertel 134: $perlvar{$varname}=$varvalue;
135: }
136: }
137: close(CONFIG);
1.7 www 138:
1.13 harris41 139: # ----------------------------- Make sure this process is running from user=www
1.29 ! www 140: &status("Check user ID");
1.13 harris41 141: my $wwwid=getpwnam('www');
142: if ($wwwid!=$<) {
143: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
144: $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
1.14 www 145: system("echo 'User ID mismatch. lonc must be run as user www.' |\
1.13 harris41 146: mailto $emailto -s '$subj' > /dev/null");
147: exit 1;
148: }
149:
1.7 www 150: # --------------------------------------------- Check if other instance running
151:
152: my $pidfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
153:
154: if (-e $pidfile) {
155: my $lfh=IO::File->new("$pidfile");
156: my $pide=<$lfh>;
157: chomp($pide);
1.11 harris41 158: if (kill 0 => $pide) { die "already running"; }
1.7 www 159: }
1.1 albertel 160:
161: # ------------------------------------------------------------- Read hosts file
162:
1.11 harris41 163: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
1.1 albertel 164:
165: while ($configline=<CONFIG>) {
166: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
167: chomp($ip);
1.28 www 168: if ($ip) {
169: $hostip{$id}=$ip;
170: $hostname{$id}=$name;
171: }
1.1 albertel 172: }
1.27 www 173:
1.1 albertel 174: close(CONFIG);
175:
176: # -------------------------------------------------------- Routines for forking
177:
178: %children = (); # keys are current child process IDs,
179: # values are hosts
180: %childpid = (); # the other way around
181:
182: %childatt = (); # number of attempts to start server
183: # for ID
184:
185: sub REAPER { # takes care of dead children
186: $SIG{CHLD} = \&REAPER;
187: my $pid = wait;
188: my $wasserver=$children{$pid};
1.6 www 189: &logthis("<font color=red>CRITICAL: "
190: ."Child $pid for server $wasserver died ($childatt{$wasserver})</font>");
1.1 albertel 191: delete $children{$pid};
192: delete $childpid{$wasserver};
193: my $port = "$perlvar{'lonSockDir'}/$wasserver";
194: unlink($port);
195: }
196:
1.27 www 197: sub hangup {
1.23 harris41 198: foreach (keys %children) {
1.17 www 199: $wasserver=$children{$_};
1.18 www 200: &status("Closing $wasserver");
1.17 www 201: &logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
1.18 www 202: &status("Kill PID $_ for $wasserver");
1.17 www 203: kill ('INT',$_);
1.23 harris41 204: }
1.27 www 205: }
206:
207: sub HUNTSMAN { # signal handler for SIGINT
208: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
209: &hangup();
1.1 albertel 210: my $execdir=$perlvar{'lonDaemons'};
211: unlink("$execdir/logs/lonc.pid");
1.5 www 212: &logthis("<font color=red>CRITICAL: Shutting down</font>");
1.1 albertel 213: exit; # clean up with dignity
214: }
215:
216: sub HUPSMAN { # signal handler for SIGHUP
217: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
1.27 www 218: &hangup();
1.5 www 219: &logthis("<font color=red>CRITICAL: Restarting</font>");
1.12 harris41 220: unlink("$execdir/logs/lonc.pid");
1.1 albertel 221: my $execdir=$perlvar{'lonDaemons'};
222: exec("$execdir/lonc"); # here we go again
223: }
224:
1.18 www 225: sub checkchildren {
226: &initnewstatus();
227: &logstatus();
228: &logthis('Going to check on the children');
1.23 harris41 229: foreach (sort keys %children) {
1.18 www 230: sleep 1;
231: unless (kill 'USR1' => $_) {
1.29 ! www 232: &logthis ('<font color=red>CRITICAL: Child '.$_.' is dead</font>');
1.18 www 233: &logstatus($$.' is dead');
234: }
1.23 harris41 235: }
1.18 www 236: }
237:
1.1 albertel 238: sub USRMAN {
239: &logthis("USR1: Trying to establish connections again");
1.6 www 240: %childatt=();
1.18 www 241: &checkchildren();
1.1 albertel 242: }
243:
244: # -------------------------------------------------- Non-critical communication
245: sub subreply {
246: my ($cmd,$server)=@_;
1.5 www 247: my $answer='';
1.1 albertel 248: if ($server ne $perlvar{'lonHostID'}) {
249: my $peerfile="$perlvar{'lonSockDir'}/$server";
250: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
251: Type => SOCK_STREAM,
252: Timeout => 10)
253: or return "con_lost";
1.21 www 254:
255:
1.19 www 256: $SIG{ALRM}=sub { die "timeout" };
257: $SIG{__DIE__}='DEFAULT';
258: eval {
259: alarm(10);
260: print $sclient "$cmd\n";
1.21 www 261: $answer=<$sclient>;
1.19 www 262: chomp($answer);
263: alarm(0);
264: };
265: if ((!$answer) || ($@=~/timeout/)) { $answer="con_lost"; }
266: $SIG{ALRM}='DEFAULT';
267: $SIG{__DIE__}=\&catchexception;
1.1 albertel 268: } else { $answer='self_reply'; }
269: return $answer;
270: }
271:
272: # --------------------------------------------------------------------- Logging
273:
274: sub logthis {
275: my $message=shift;
276: my $execdir=$perlvar{'lonDaemons'};
277: my $fh=IO::File->new(">>$execdir/logs/lonc.log");
278: my $now=time;
279: my $local=localtime($now);
1.18 www 280: $lastlog=$local.': '.$message;
1.29 ! www 281: print $fh "$local ($$) [$status]: $message\n";
1.1 albertel 282: }
283:
1.3 www 284:
285: sub logperm {
286: my $message=shift;
287: my $execdir=$perlvar{'lonDaemons'};
288: my $now=time;
289: my $local=localtime($now);
290: my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");
291: print $fh "$now:$message:$local\n";
292: }
1.18 www 293: # ------------------------------------------------------------------ Log status
294:
295: sub logstatus {
296: my $docdir=$perlvar{'lonDocRoot'};
297: my $fh=IO::File->new(">>$docdir/lon-status/loncstatus.txt");
298: print $fh $$."\t".$status."\t".$lastlog."\n";
299: }
300:
301: sub initnewstatus {
302: my $docdir=$perlvar{'lonDocRoot'};
303: my $fh=IO::File->new(">$docdir/lon-status/loncstatus.txt");
304: my $now=time;
305: my $local=localtime($now);
306: print $fh "LONC status $local - parent $$\n\n";
307: }
308:
309: # -------------------------------------------------------------- Status setting
310:
311: sub status {
312: my $what=shift;
313: my $now=time;
314: my $local=localtime($now);
315: $status=$local.': '.$what;
316: }
317:
1.3 www 318:
1.1 albertel 319: # ---------------------------------------------------- Fork once and dissociate
1.29 ! www 320: &status("Fork and dissociate");
1.1 albertel 321: $fpid=fork;
322: exit if $fpid;
1.11 harris41 323: die "Couldn't fork: $!" unless defined ($fpid);
1.1 albertel 324:
1.11 harris41 325: POSIX::setsid() or die "Can't start new session: $!";
1.1 albertel 326:
327: # ------------------------------------------------------- Write our PID on disk
1.29 ! www 328: &status("Write PID");
1.1 albertel 329: $execdir=$perlvar{'lonDaemons'};
330: open (PIDSAVE,">$execdir/logs/lonc.pid");
331: print PIDSAVE "$$\n";
332: close(PIDSAVE);
1.5 www 333: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
1.1 albertel 334:
335: # ----------------------------- Ignore signals generated during initial startup
336: $SIG{HUP}=$SIG{USR1}='IGNORE';
337: # ------------------------------------------------------- Now we are on our own
338:
339: # Fork off our children, one for every server
340:
1.18 www 341: &status("Forking ...");
342:
1.1 albertel 343: foreach $thisserver (keys %hostip) {
1.26 www 344: if (&online($hostname{$thisserver})) {
345: make_new_child($thisserver);
346: }
1.1 albertel 347: }
348:
349: &logthis("Done starting initial servers");
350: # ----------------------------------------------------- Install signal handlers
351:
352: $SIG{CHLD} = \&REAPER;
353: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
354: $SIG{HUP} = \&HUPSMAN;
355: $SIG{USR1} = \&USRMAN;
356:
357: # And maintain the population.
358: while (1) {
1.18 www 359: &status("Sleeping");
1.1 albertel 360: sleep; # wait for a signal (i.e., child's death)
361: # See who died and start new one
1.18 www 362: &status("Woke up");
1.1 albertel 363: foreach $thisserver (keys %hostip) {
364: if (!$childpid{$thisserver}) {
1.26 www 365: if (($childatt{$thisserver}<$childmaxattempts) &&
366: (&online($hostname{$thisserver}))) {
1.6 www 367: $childatt{$thisserver}++;
1.5 www 368: &logthis(
369: "<font color=yellow>INFO: Trying to reconnect for $thisserver "
1.29 ! www 370: ."(".($childatt{$thisserver}?$childatt{$thisserver}:'none').
! 371: " of $childmaxattempts attempts)</font>");
1.1 albertel 372: make_new_child($thisserver);
1.26 www 373: } else {
374: &logthis(
375: "<font color=yellow>INFO: Skipping $thisserver "
376: ."($childatt{$thisserver} of $childmaxattempts attempts)</font>");
377: }
378:
1.1 albertel 379: }
380: }
381: }
382:
383:
384: sub make_new_child {
385:
386: my $conserver=shift;
387: my $pid;
388: my $sigset;
389: &logthis("Attempting to start child for server $conserver");
390: # block signal for fork
391: $sigset = POSIX::SigSet->new(SIGINT);
392: sigprocmask(SIG_BLOCK, $sigset)
1.11 harris41 393: or die "Can't block SIGINT for fork: $!\n";
1.1 albertel 394:
1.11 harris41 395: die "fork: $!" unless defined ($pid = fork);
1.1 albertel 396:
397: if ($pid) {
398: # Parent records the child's birth and returns.
399: sigprocmask(SIG_UNBLOCK, $sigset)
1.11 harris41 400: or die "Can't unblock SIGINT for fork: $!\n";
1.1 albertel 401: $children{$pid} = $conserver;
402: $childpid{$conserver} = $pid;
403: return;
404: } else {
405: # Child can *not* return from this subroutine.
406: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
1.18 www 407: $SIG{USR1}= \&logstatus;
408:
1.1 albertel 409: # unblock signals
410: sigprocmask(SIG_UNBLOCK, $sigset)
1.11 harris41 411: or die "Can't unblock SIGINT for fork: $!\n";
1.1 albertel 412:
413: # ----------------------------- This is the modified main program of non-forker
414:
415: $port = "$perlvar{'lonSockDir'}/$conserver";
416:
417: unlink($port);
1.18 www 418:
1.29 ! www 419: # -------------------------------------------------------------- Open other end
1.1 albertel 420:
1.29 ! www 421: &openremote($conserver);
1.1 albertel 422:
1.3 www 423: # ----------------------------------------- We're online, send delayed messages
1.18 www 424: &status("Checking for delayed messages");
1.4 www 425: my @allbuffered;
1.3 www 426: my $path="$perlvar{'lonSockDir'}/delayed";
1.4 www 427: opendir(DIRHANDLE,$path);
428: @allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;
429: closedir(DIRHANDLE);
1.3 www 430: my $dfname;
1.23 harris41 431: foreach (@allbuffered) {
1.18 www 432: &status("Sending delayed $conserver $_");
1.4 www 433: $dfname="$path/$_";
1.29 ! www 434: &logthis('Sending '.$dfname);
1.3 www 435: my $wcmd;
436: {
437: my $dfh=IO::File->new($dfname);
1.4 www 438: $cmd=<$dfh>;
1.3 www 439: }
440: chomp($cmd);
441: my $bcmd=$cmd;
442: if ($cmd =~ /^encrypt\:/) {
443: my $rcmd=$cmd;
444: $rcmd =~ s/^encrypt\://;
445: chomp($rcmd);
446: my $cmdlength=length($rcmd);
447: $rcmd.=" ";
448: my $encrequest='';
449: for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
450: $encrequest.=
451: unpack("H16",$cipher->encrypt(substr($rcmd,$encidx,8)));
452: }
453: $cmd="enc:$cmdlength:$encrequest\n";
454: }
1.20 www 455: $SIG{ALRM}=sub { die "timeout" };
456: $SIG{__DIE__}='DEFAULT';
457: eval {
458: alarm(60);
1.3 www 459: print $remotesock "$cmd\n";
460: $answer=<$remotesock>;
461: chomp($answer);
1.20 www 462: alarm(0);
463: };
464: $SIG{ALRM}='DEFAULT';
465: $SIG{__DIE__}=\&catchexception;
466:
467: if (($answer ne '') && ($@!~/timeout/)) {
1.3 www 468: unlink("$dfname");
1.4 www 469: &logthis("Delayed $cmd to $conserver: >$answer<");
1.3 www 470: &logperm("S:$conserver:$bcmd");
471: }
1.23 harris41 472: }
1.1 albertel 473:
474: # ------------------------------------------------------- Listen to UNIX socket
1.18 www 475: &status("Opening socket $conserver");
1.1 albertel 476: unless (
477: $server = IO::Socket::UNIX->new(Local => $port,
478: Type => SOCK_STREAM,
479: Listen => 10 )
1.5 www 480: ) {
481: my $st=120+int(rand(240));
482: &logthis(
483: "<font color=blue>WARNING: ".
484: "Can't make server socket $conserver ($st secs): $@</font>");
485: sleep($st);
1.1 albertel 486: exit;
487: };
488:
489: # -----------------------------------------------------------------------------
490:
1.5 www 491: &logthis("<font color=green>$conserver online</font>");
492:
493: # -----------------------------------------------------------------------------
1.1 albertel 494: # begin with empty buffers
495: %inbuffer = ();
496: %outbuffer = ();
497: %ready = ();
498:
499: tie %ready, 'Tie::RefHash';
500:
501: nonblock($server);
502: $select = IO::Select->new($server);
503:
504: # Main loop: check reads/accepts, check writes, check ready to process
505: while (1) {
506: my $client;
507: my $rv;
508: my $data;
509:
510: # check for new information on the connections we have
511:
512: # anything to read or accept?
1.16 www 513: foreach $client ($select->can_read(0.1)) {
1.1 albertel 514:
515: if ($client == $server) {
516: # accept a new connection
1.18 www 517: &status("Accept new connection: $conserver");
1.1 albertel 518: $client = $server->accept();
519: $select->add($client);
520: nonblock($client);
521: } else {
522: # read data
523: $data = '';
524: $rv = $client->recv($data, POSIX::BUFSIZ, 0);
525:
526: unless (defined($rv) && length $data) {
527: # This would be the end of file, so close the client
528: delete $inbuffer{$client};
529: delete $outbuffer{$client};
530: delete $ready{$client};
531:
1.18 www 532: &status("Idle $conserver");
1.1 albertel 533: $select->remove($client);
534: close $client;
535: next;
536: }
537:
538: $inbuffer{$client} .= $data;
539:
540: # test whether the data in the buffer or the data we
541: # just read means there is a complete request waiting
542: # to be fulfilled. If there is, set $ready{$client}
543: # to the requests waiting to be fulfilled.
544: while ($inbuffer{$client} =~ s/(.*\n)//) {
545: push( @{$ready{$client}}, $1 );
546: }
547: }
548: }
549:
550: # Any complete requests to process?
551: foreach $client (keys %ready) {
1.25 albertel 552: handle($client);
1.1 albertel 553: }
554:
555: # Buffers to flush?
556: foreach $client ($select->can_write(1)) {
557: # Skip this client if we have nothing to say
558: next unless exists $outbuffer{$client};
1.25 albertel 559:
1.1 albertel 560: $rv = $client->send($outbuffer{$client}, 0);
1.29 ! www 561:
! 562: unless ($outbuffer{$client}=~/con_lost\n$/) {
1.1 albertel 563: unless (defined $rv) {
564: # Whine, but move on.
1.15 www 565: &logthis("I was told I could write, but I can't.\n");
1.1 albertel 566: next;
567: }
1.15 www 568: $errno=$!;
1.1 albertel 569: if (($rv == length $outbuffer{$client}) ||
1.15 www 570: ($errno == POSIX::EWOULDBLOCK) || ($errno == 0)) {
1.1 albertel 571: substr($outbuffer{$client}, 0, $rv) = '';
572: delete $outbuffer{$client} unless length $outbuffer{$client};
573: } else {
574: # Couldn't write all the data, and it wasn't because
575: # it would have blocked. Shutdown and move on.
1.15 www 576:
577: &logthis("Dropping data with ".$errno.": ".
578: length($outbuffer{$client}).", $rv");
579:
1.1 albertel 580: delete $inbuffer{$client};
581: delete $outbuffer{$client};
582: delete $ready{$client};
583:
584: $select->remove($client);
585: close($client);
586: next;
587: }
1.29 ! www 588: } else {
! 589: # -------------------------------------------------------- Wow, connection lost
! 590: &logthis(
! 591: "<font color=red>CRITICAL: Closing connection $conserver</font>");
! 592: &status("Connection lost $conserver");
! 593: $remotesock->shutdown(2);
! 594: &logthis("Attempting to open new connection");
! 595: &openremote($conserver);
! 596: }
1.1 albertel 597: }
1.29 ! www 598:
1.1 albertel 599: }
600: }
1.25 albertel 601:
1.1 albertel 602: # ------------------------------------------------------- End of make_new_child
603:
604: # handle($socket) deals with all pending requests for $client
605: sub handle {
606: # requests are in $ready{$client}
607: # send output to $outbuffer{$client}
608: my $client = shift;
609: my $request;
610:
611: foreach $request (@{$ready{$client}}) {
612: # ============================================================= Process request
613: # $request is the text of the request
614: # put text of reply into $outbuffer{$client}
1.29 ! www 615: # ------------------------------------------------------------ Is this the end?
! 616: if ($request eq "close_connection_exit\n") {
! 617: &status("Request close connection: $conserver");
! 618: &logthis(
! 619: "<font color=red>CRITICAL: Request Close Connection $conserver</font>");
! 620: $remotesock->shutdown(2);
! 621: $server->close();
! 622: exit;
! 623: }
1.1 albertel 624: # -----------------------------------------------------------------------------
625: if ($request =~ /^encrypt\:/) {
626: my $cmd=$request;
627: $cmd =~ s/^encrypt\://;
628: chomp($cmd);
629: my $cmdlength=length($cmd);
630: $cmd.=" ";
631: my $encrequest='';
632: for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
633: $encrequest.=
634: unpack("H16",$cipher->encrypt(substr($cmd,$encidx,8)));
635: }
636: $request="enc:$cmdlength:$encrequest\n";
637: }
1.19 www 638: # --------------------------------------------------------------- Main exchange
639: $SIG{ALRM}=sub { die "timeout" };
640: $SIG{__DIE__}='DEFAULT';
641: eval {
642: alarm(300);
1.18 www 643: &status("Sending $conserver: $request");
1.1 albertel 644: print $remotesock "$request";
1.18 www 645: &status("Waiting for reply from $conserver: $request");
1.1 albertel 646: $answer=<$remotesock>;
1.18 www 647: &status("Received reply: $request");
1.19 www 648: alarm(0);
649: };
650: if ($@=~/timeout/) {
651: $answer='';
652: &logthis(
653: "<font color=red>CRITICAL: Timeout $conserver: $request</font>");
654: }
655: $SIG{ALRM}='DEFAULT';
656: $SIG{__DIE__}=\&catchexception;
657:
658:
1.1 albertel 659: if ($answer) {
660: if ($answer =~ /^enc/) {
661: my ($cmd,$cmdlength,$encinput)=split(/:/,$answer);
662: chomp($encinput);
663: $answer='';
664: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
665: $answer.=$cipher->decrypt(
666: pack("H16",substr($encinput,$encidx,16))
667: );
668: }
669: $answer=substr($answer,0,$cmdlength);
670: $answer.="\n";
671: }
672: $outbuffer{$client} .= $answer;
673: } else {
674: $outbuffer{$client} .= "con_lost\n";
675: }
676:
677: # ===================================================== Done processing request
678: }
679: delete $ready{$client};
1.18 www 680: &status("Completed $conserver: $request");
1.1 albertel 681: # -------------------------------------------------------------- End non-forker
682: }
683: # ---------------------------------------------------------- End make_new_child
1.25 albertel 684: }
1.1 albertel 685:
686: # nonblock($socket) puts socket into nonblocking mode
687: sub nonblock {
688: my $socket = shift;
689: my $flags;
690:
691:
692: $flags = fcntl($socket, F_GETFL, 0)
1.11 harris41 693: or die "Can't get flags for socket: $!\n";
1.1 albertel 694: fcntl($socket, F_SETFL, $flags | O_NONBLOCK)
1.11 harris41 695: or die "Can't make socket nonblocking: $!\n";
1.29 ! www 696: }
! 697:
! 698:
! 699: sub openremote {
! 700: # ---------------------------------------------------- Client to network server
! 701:
! 702: my $conserver=shift;
! 703:
! 704: &status("Opening TCP: $conserver");
! 705:
! 706: unless (
! 707: $remotesock = IO::Socket::INET->new(PeerAddr => $hostip{$conserver},
! 708: PeerPort => $perlvar{'londPort'},
! 709: Proto => "tcp",
! 710: Type => SOCK_STREAM)
! 711: ) {
! 712: my $st=120+int(rand(240));
! 713: &logthis(
! 714: "<font color=blue>WARNING: Couldn't connect $conserver ($st secs): $@</font>");
! 715: sleep($st);
! 716: exit;
! 717: };
! 718: # ----------------------------------------------------------------- Init dialog
! 719:
! 720: &status("Init dialogue: $conserver");
! 721:
! 722: $SIG{ALRM}=sub { die "timeout" };
! 723: $SIG{__DIE__}='DEFAULT';
! 724: eval {
! 725: alarm(60);
! 726: print $remotesock "init\n";
! 727: $answer=<$remotesock>;
! 728: print $remotesock "$answer";
! 729: $answer=<$remotesock>;
! 730: chomp($answer);
! 731: alarm(0);
! 732: };
! 733: $SIG{ALRM}='DEFAULT';
! 734: $SIG{__DIE__}=\&catchexception;
! 735:
! 736: if ($@=~/timeout/) {
! 737: &logthis("Timed out during init: $conserver");
! 738: exit;
! 739: }
! 740:
! 741: if ($answer ne 'ok') {
! 742: &logthis("Init reply for $conserver: >$answer<");
! 743: my $st=120+int(rand(240));
! 744: &logthis(
! 745: "<font color=blue>WARNING: Init failed $conserver ($st secs)</font>");
! 746: sleep($st);
! 747: exit;
! 748: }
! 749:
! 750: sleep 5;
! 751: &status("Ponging $conserver");
! 752: print $remotesock "pong\n";
! 753: $answer=<$remotesock>;
! 754: chomp($answer);
! 755: if ($answer!~/^$converver/) {
! 756: &logthis("Pong reply for $conserver: >$answer<");
! 757: }
! 758: # ----------------------------------------------------------- Initialize cipher
! 759:
! 760: &status("Initialize cipher: $conserver");
! 761: print $remotesock "ekey\n";
! 762: my $buildkey=<$remotesock>;
! 763: my $key=$conserver.$perlvar{'lonHostID'};
! 764: $key=~tr/a-z/A-Z/;
! 765: $key=~tr/G-P/0-9/;
! 766: $key=~tr/Q-Z/0-9/;
! 767: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
! 768: $key=substr($key,0,32);
! 769: my $cipherkey=pack("H32",$key);
! 770: if ($cipher=new IDEA $cipherkey) {
! 771: &logthis("Secure connection initialized: $conserver");
! 772: } else {
! 773: my $st=120+int(rand(240));
! 774: &logthis(
! 775: "<font color=blue>WARNING: ".
! 776: "Could not establish secure connection, $conserver ($st secs)!</font>");
! 777: sleep($st);
! 778: exit;
! 779: }
! 780:
1.8 harris41 781: }
1.1 albertel 782:
1.23 harris41 783: # ----------------------------------- POD (plain old documentation, CPAN style)
784:
785: =head1 NAME
786:
787: lonc - LON TCP-MySQL-Server Daemon for handling database requests.
788:
789: =head1 SYNOPSIS
790:
791: Should only be run as user=www. This is a command-line script which
792: is invoked by loncron.
793:
794: =head1 DESCRIPTION
795:
796: Provides persistent TCP connections to the other servers in the network
797: through multiplexed domain sockets
798:
799: PID in subdir logs/lonc.pid
800: kill kills
801: HUP restarts
802: USR1 tries to open connections again
803:
804: =head1 README
805:
806: Not yet written.
807:
808: =head1 PREREQUISITES
809:
810: POSIX
811: IO::Socket
812: IO::Select
813: IO::File
814: Socket
815: Fcntl
816: Tie::RefHash
817: Crypt::IDEA
818:
819: =head1 COREQUISITES
820:
821: =head1 OSNAMES
822:
823: linux
824:
825: =head1 SCRIPT CATEGORIES
826:
827: Server/Process
828:
829: =cut
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