1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: #
5: # $Id: lond,v 1.114 2003/03/14 19:29:36 albertel 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: # 06/29,06/30,07/14,07/15,07/17,07/20,07/25,09/18 Gerd Kortemeyer
35: # 12/05,12/13,12/29 Gerd Kortemeyer
36: # YEAR=2001
37: # 02/12 Gerd Kortemeyer
38: # 03/24 Gerd Kortemeyer
39: # 05/11,05/28,08/30 Gerd Kortemeyer
40: # 11/26,11/27 Gerd Kortemeyer
41: # 12/22 Gerd Kortemeyer
42: # YEAR=2002
43: # 01/20/02,02/05 Gerd Kortemeyer
44: # 02/05 Guy Albertelli
45: # 02/12 Gerd Kortemeyer
46: # 02/19 Matthew Hall
47: # 02/25 Gerd Kortemeyer
48: # 01/xx/2003 Ron Fox.. Remove preforking. This makes the general daemon
49: # logic simpler (and there were problems maintaining the preforked
50: # population). Since the time averaged connection rate is close to zero
51: # because lonc's purpose is to maintain near continuous connnections,
52: # preforking is not really needed.
53: ###
54:
55:
56: use lib '/home/httpd/lib/perl/';
57: use LONCAPA::Configuration;
58:
59: use IO::Socket;
60: use IO::File;
61: use Apache::File;
62: use Symbol;
63: use POSIX;
64: use Crypt::IDEA;
65: use LWP::UserAgent();
66: use GDBM_File;
67: use Authen::Krb4;
68: use Authen::Krb5;
69: use lib '/home/httpd/lib/perl/';
70: use localauth;
71:
72: my $DEBUG = 0; # Non zero to enable debug log entries.
73:
74: my $status='';
75: my $lastlog='';
76:
77: #
78: # The array below are password error strings."
79: #
80: my $lastpwderror = 13; # Largest error number from lcpasswd.
81: my @passwderrors = ("ok",
82: "lcpasswd must be run as user 'www'",
83: "lcpasswd got incorrect number of arguments",
84: "lcpasswd did not get the right nubmer of input text lines",
85: "lcpasswd too many simultaneous pwd changes in progress",
86: "lcpasswd User does not exist.",
87: "lcpasswd Incorrect current passwd",
88: "lcpasswd Unable to su to root.",
89: "lcpasswd Cannot set new passwd.",
90: "lcpasswd Username has invalid characters",
91: "lcpasswd Invalid characters in password",
92: "11", "12",
93: "lcpasswd Password mismatch");
94:
95:
96: # The array below are lcuseradd error strings.:
97:
98: my $lastadderror = 13;
99: my @adderrors = ("ok",
100: "User ID mismatch, lcuseradd must run as user www",
101: "lcuseradd Incorrect number of command line parameters must be 3",
102: "lcuseradd Incorrect number of stdinput lines, must be 3",
103: "lcuseradd Too many other simultaneous pwd changes in progress",
104: "lcuseradd User does not exist",
105: "lcuseradd Unabel to mak ewww member of users's group",
106: "lcuseradd Unable to su to root",
107: "lcuseradd Unable to set password",
108: "lcuseradd Usrname has invbalid charcters",
109: "lcuseradd Password has an invalid character",
110: "lcuseradd User already exists",
111: "lcuseradd Could not add user.",
112: "lcuseradd Password mismatch");
113:
114:
115: #
116: # Convert an error return code from lcpasswd to a string value.
117: #
118: sub lcpasswdstrerror {
119: my $ErrorCode = shift;
120: if(($ErrorCode < 0) || ($ErrorCode > $lastpwderror)) {
121: return "lcpasswd Unrecognized error return value ".$ErrorCode;
122: } else {
123: return $passwderrors[$ErrorCode];
124: }
125: }
126:
127: #
128: # Convert an error return code from lcuseradd to a string value:
129: #
130: sub lcuseraddstrerror {
131: my $ErrorCode = shift;
132: if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
133: return "lcuseradd - Unrecognized error code: ".$ErrorCode;
134: } else {
135: return $adderrors[$ErrorCode];
136: }
137: }
138:
139: # grabs exception and records it to log before exiting
140: sub catchexception {
141: my ($error)=@_;
142: $SIG{'QUIT'}='DEFAULT';
143: $SIG{__DIE__}='DEFAULT';
144: &logthis("<font color=red>CRITICAL: "
145: ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
146: ."a crash with this error msg->[$error]</font>");
147: &logthis('Famous last words: '.$status.' - '.$lastlog);
148: if ($client) { print $client "error: $error\n"; }
149: $server->close();
150: die($error);
151: }
152:
153: sub timeout {
154: &logthis("<font color=ref>CRITICAL: TIME OUT ".$$."</font>");
155: &catchexception('Timeout');
156: }
157: # -------------------------------- Set signal handlers to record abnormal exits
158:
159: $SIG{'QUIT'}=\&catchexception;
160: $SIG{__DIE__}=\&catchexception;
161:
162: # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
163: &status("Read loncapa.conf and loncapa_apache.conf");
164: my $perlvarref=LONCAPA::Configuration::read_conf('loncapa.conf');
165: my %perlvar=%{$perlvarref};
166: undef $perlvarref;
167:
168: # ----------------------------- Make sure this process is running from user=www
169: my $wwwid=getpwnam('www');
170: if ($wwwid!=$<) {
171: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
172: $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
173: system("echo 'User ID mismatch. lond must be run as user www.' |\
174: mailto $emailto -s '$subj' > /dev/null");
175: exit 1;
176: }
177:
178: # --------------------------------------------- Check if other instance running
179:
180: my $pidfile="$perlvar{'lonDaemons'}/logs/lond.pid";
181:
182: if (-e $pidfile) {
183: my $lfh=IO::File->new("$pidfile");
184: my $pide=<$lfh>;
185: chomp($pide);
186: if (kill 0 => $pide) { die "already running"; }
187: }
188:
189: $PREFORK=4; # number of children to maintain, at least four spare
190:
191: # ------------------------------------------------------------- Read hosts file
192:
193: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
194:
195: while ($configline=<CONFIG>) {
196: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
197: chomp($ip); $ip=~s/\D+$//;
198: $hostid{$ip}=$id;
199: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
200: $PREFORK++;
201: }
202: close(CONFIG);
203:
204: # establish SERVER socket, bind and listen.
205: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
206: Type => SOCK_STREAM,
207: Proto => 'tcp',
208: Reuse => 1,
209: Listen => 10 )
210: or die "making socket: $@\n";
211:
212: # --------------------------------------------------------- Do global variables
213:
214: # global variables
215:
216: $MAX_CLIENTS_PER_CHILD = 50; # number of clients each child should
217: # process
218: %children = (); # keys are current child process IDs
219: $children = 0; # current number of children
220:
221: sub REAPER { # takes care of dead children
222: $SIG{CHLD} = \&REAPER;
223: my $pid = wait;
224: if (defined($children{$pid})) {
225: &logthis("Child $pid died");
226: $children --;
227: delete $children{$pid};
228: } else {
229: &logthis("Unknown Child $pid died");
230: }
231: }
232:
233: sub HUNTSMAN { # signal handler for SIGINT
234: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
235: kill 'INT' => keys %children;
236: &logthis("Free socket: ".shutdown($server,2)); # free up socket
237: my $execdir=$perlvar{'lonDaemons'};
238: unlink("$execdir/logs/lond.pid");
239: &logthis("<font color=red>CRITICAL: Shutting down</font>");
240: exit; # clean up with dignity
241: }
242:
243: sub HUPSMAN { # signal handler for SIGHUP
244: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
245: kill 'INT' => keys %children;
246: &logthis("Free socket: ".shutdown($server,2)); # free up socket
247: &logthis("<font color=red>CRITICAL: Restarting</font>");
248: unlink("$execdir/logs/lond.pid");
249: my $execdir=$perlvar{'lonDaemons'};
250: exec("$execdir/lond"); # here we go again
251: }
252:
253: sub checkchildren {
254: &initnewstatus();
255: &logstatus();
256: &logthis('Going to check on the children');
257: $docdir=$perlvar{'lonDocRoot'};
258: foreach (sort keys %children) {
259: sleep 1;
260: unless (kill 'USR1' => $_) {
261: &logthis ('Child '.$_.' is dead');
262: &logstatus($$.' is dead');
263: }
264: }
265: sleep 5;
266: $SIG{ALRM} = sub { die "timeout" };
267: $SIG{__DIE__} = 'DEFAULT';
268: foreach (sort keys %children) {
269: unless (-e "$docdir/lon-status/londchld/$_.txt") {
270: eval {
271: alarm(300);
272: &logthis('Child '.$_.' did not respond');
273: kill 9 => $_;
274: $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
275: $subj="LON: $perlvar{'lonHostID'} killed lond process $_";
276: my $result=`echo 'Killed lond process $_.' | mailto $emailto -s '$subj' > /dev/null`;
277: $execdir=$perlvar{'lonDaemons'};
278: $result=`/bin/cp $execdir/logs/lond.log $execdir/logs/lond.log.$_`;
279: alarm(0);
280: }
281: }
282: }
283: $SIG{ALRM} = 'DEFAULT';
284: $SIG{__DIE__} = \&cathcexception;
285: }
286:
287: # --------------------------------------------------------------------- Logging
288:
289: sub logthis {
290: my $message=shift;
291: my $execdir=$perlvar{'lonDaemons'};
292: my $fh=IO::File->new(">>$execdir/logs/lond.log");
293: my $now=time;
294: my $local=localtime($now);
295: $lastlog=$local.': '.$message;
296: print $fh "$local ($$): $message\n";
297: }
298:
299: # ------------------------- Conditional log if $DEBUG true.
300: sub Debug {
301: my $message = shift;
302: if($DEBUG) {
303: &logthis($message);
304: }
305: }
306: # ------------------------------------------------------------------ Log status
307:
308: sub logstatus {
309: my $docdir=$perlvar{'lonDocRoot'};
310: {
311: my $fh=IO::File->new(">>$docdir/lon-status/londstatus.txt");
312: print $fh $$."\t".$status."\t".$lastlog."\n";
313: $fh->close();
314: }
315: {
316: my $fh=IO::File->new(">$docdir/lon-status/londchld/$$.txt");
317: print $fh $status."\n".$lastlog."\n".time;
318: $fh->close();
319: }
320: }
321:
322: sub initnewstatus {
323: my $docdir=$perlvar{'lonDocRoot'};
324: my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
325: my $now=time;
326: my $local=localtime($now);
327: print $fh "LOND status $local - parent $$\n\n";
328: opendir(DIR,"$docdir/lon-status/londchld");
329: while ($filename=readdir(DIR)) {
330: unlink("$docdir/lon-status/londchld/$filename");
331: }
332: closedir(DIR);
333: }
334:
335: # -------------------------------------------------------------- Status setting
336:
337: sub status {
338: my $what=shift;
339: my $now=time;
340: my $local=localtime($now);
341: $status=$local.': '.$what;
342: $0='lond: '.$what.' '.$local;
343: }
344:
345: # -------------------------------------------------------- Escape Special Chars
346:
347: sub escape {
348: my $str=shift;
349: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
350: return $str;
351: }
352:
353: # ----------------------------------------------------- Un-Escape Special Chars
354:
355: sub unescape {
356: my $str=shift;
357: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
358: return $str;
359: }
360:
361: # ----------------------------------------------------------- Send USR1 to lonc
362:
363: sub reconlonc {
364: my $peerfile=shift;
365: &logthis("Trying to reconnect for $peerfile");
366: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
367: if (my $fh=IO::File->new("$loncfile")) {
368: my $loncpid=<$fh>;
369: chomp($loncpid);
370: if (kill 0 => $loncpid) {
371: &logthis("lonc at pid $loncpid responding, sending USR1");
372: kill USR1 => $loncpid;
373: sleep 5;
374: if (-e "$peerfile") { return; }
375: &logthis("$peerfile still not there, give it another try");
376: sleep 10;
377: if (-e "$peerfile") { return; }
378: &logthis(
379: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
380: } else {
381: &logthis(
382: "<font color=red>CRITICAL: "
383: ."lonc at pid $loncpid not responding, giving up</font>");
384: }
385: } else {
386: &logthis('<font color=red>CRITICAL: lonc not running, giving up</font>');
387: }
388: }
389:
390: # -------------------------------------------------- Non-critical communication
391:
392: sub subreply {
393: my ($cmd,$server)=@_;
394: my $peerfile="$perlvar{'lonSockDir'}/$server";
395: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
396: Type => SOCK_STREAM,
397: Timeout => 10)
398: or return "con_lost";
399: print $sclient "$cmd\n";
400: my $answer=<$sclient>;
401: chomp($answer);
402: if (!$answer) { $answer="con_lost"; }
403: return $answer;
404: }
405:
406: sub reply {
407: my ($cmd,$server)=@_;
408: my $answer;
409: if ($server ne $perlvar{'lonHostID'}) {
410: $answer=subreply($cmd,$server);
411: if ($answer eq 'con_lost') {
412: $answer=subreply("ping",$server);
413: if ($answer ne $server) {
414: &logthis("sub reply: answer != server");
415: &reconlonc("$perlvar{'lonSockDir'}/$server");
416: }
417: $answer=subreply($cmd,$server);
418: }
419: } else {
420: $answer='self_reply';
421: }
422: return $answer;
423: }
424:
425: # -------------------------------------------------------------- Talk to lonsql
426:
427: sub sqlreply {
428: my ($cmd)=@_;
429: my $answer=subsqlreply($cmd);
430: if ($answer eq 'con_lost') { $answer=subsqlreply($cmd); }
431: return $answer;
432: }
433:
434: sub subsqlreply {
435: my ($cmd)=@_;
436: my $unixsock="mysqlsock";
437: my $peerfile="$perlvar{'lonSockDir'}/$unixsock";
438: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
439: Type => SOCK_STREAM,
440: Timeout => 10)
441: or return "con_lost";
442: print $sclient "$cmd\n";
443: my $answer=<$sclient>;
444: chomp($answer);
445: if (!$answer) { $answer="con_lost"; }
446: return $answer;
447: }
448:
449: # -------------------------------------------- Return path to profile directory
450:
451: sub propath {
452: my ($udom,$uname)=@_;
453: $udom=~s/\W//g;
454: $uname=~s/\W//g;
455: my $subdir=$uname.'__';
456: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
457: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
458: return $proname;
459: }
460:
461: # --------------------------------------- Is this the home server of an author?
462:
463: sub ishome {
464: my $author=shift;
465: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
466: my ($udom,$uname)=split(/\//,$author);
467: my $proname=propath($udom,$uname);
468: if (-e $proname) {
469: return 'owner';
470: } else {
471: return 'not_owner';
472: }
473: }
474:
475: # ======================================================= Continue main program
476: # ---------------------------------------------------- Fork once and dissociate
477:
478: $fpid=fork;
479: exit if $fpid;
480: die "Couldn't fork: $!" unless defined ($fpid);
481:
482: POSIX::setsid() or die "Can't start new session: $!";
483:
484: # ------------------------------------------------------- Write our PID on disk
485:
486: $execdir=$perlvar{'lonDaemons'};
487: open (PIDSAVE,">$execdir/logs/lond.pid");
488: print PIDSAVE "$$\n";
489: close(PIDSAVE);
490: &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
491: &status('Starting');
492:
493:
494:
495: # ----------------------------------------------------- Install signal handlers
496:
497:
498: $SIG{CHLD} = \&REAPER;
499: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
500: $SIG{HUP} = \&HUPSMAN;
501: $SIG{USR1} = \&checkchildren;
502:
503:
504:
505: # --------------------------------------------------------------
506: # Accept connections. When a connection comes in, it is validated
507: # and if good, a child process is created to process transactions
508: # along the connection.
509:
510: while (1) {
511: $client = $server->accept() or next;
512: make_new_child($client);
513: }
514:
515: sub make_new_child {
516: my $client;
517: my $pid;
518: my $cipher;
519: my $sigset;
520:
521: $client = shift;
522: &logthis("Attempting to start child");
523: # block signal for fork
524: $sigset = POSIX::SigSet->new(SIGINT);
525: sigprocmask(SIG_BLOCK, $sigset)
526: or die "Can't block SIGINT for fork: $!\n";
527:
528: die "fork: $!" unless defined ($pid = fork);
529:
530: if ($pid) {
531: # Parent records the child's birth and returns.
532: sigprocmask(SIG_UNBLOCK, $sigset)
533: or die "Can't unblock SIGINT for fork: $!\n";
534: $children{$pid} = 1;
535: $children++;
536: &status('Started child '.$pid);
537: return;
538: } else {
539: # Child can *not* return from this subroutine.
540: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
541: $SIG{USR1}= \&logstatus;
542: $SIG{ALRM}= \&timeout;
543: $lastlog='Forked ';
544: $status='Forked';
545:
546: # unblock signals
547: sigprocmask(SIG_UNBLOCK, $sigset)
548: or die "Can't unblock SIGINT for fork: $!\n";
549:
550: $tmpsnum=0;
551: #---------------------------------------------------- kerberos 5 initialization
552: &Authen::Krb5::init_context();
553: &Authen::Krb5::init_ets();
554:
555: &status('Accepted connection');
556: # =============================================================================
557: # do something with the connection
558: # -----------------------------------------------------------------------------
559: $client->sockopt(SO_KEEPALIVE, 1);# Enable monitoring of
560: # connection liveness.
561: # see if we know client and check for spoof IP by challenge
562: my $caller = getpeername($client);
563: my ($port,$iaddr)=unpack_sockaddr_in($caller);
564: my $clientip=inet_ntoa($iaddr);
565: my $clientrec=($hostid{$clientip} ne undef);
566: &logthis(
567: "<font color=yellow>INFO: Connection $i, $clientip ($hostid{$clientip})</font>"
568: );
569: &status("Connecting $clientip ($hostid{$clientip})");
570: my $clientok;
571: if ($clientrec) {
572: &status("Waiting for init from $clientip ($hostid{$clientip})");
573: my $remotereq=<$client>;
574: $remotereq=~s/\W//g;
575: if ($remotereq eq 'init') {
576: my $challenge="$$".time;
577: print $client "$challenge\n";
578: &status(
579: "Waiting for challenge reply from $clientip ($hostid{$clientip})");
580: $remotereq=<$client>;
581: $remotereq=~s/\W//g;
582: if ($challenge eq $remotereq) {
583: $clientok=1;
584: print $client "ok\n";
585: } else {
586: &logthis(
587: "<font color=blue>WARNING: $clientip did not reply challenge</font>");
588: &status('No challenge reply '.$clientip);
589: }
590: } else {
591: &logthis(
592: "<font color=blue>WARNING: "
593: ."$clientip failed to initialize: >$remotereq< </font>");
594: &status('No init '.$clientip);
595: }
596: } else {
597: &logthis(
598: "<font color=blue>WARNING: Unknown client $clientip</font>");
599: &status('Hung up on '.$clientip);
600: }
601: if ($clientok) {
602: # ---------------- New known client connecting, could mean machine online again
603:
604: &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
605: &logthis(
606: "<font color=green>Established connection: $hostid{$clientip}</font>");
607: &status('Will listen to '.$hostid{$clientip});
608: # ------------------------------------------------------------ Process requests
609: while (my $userinput=<$client>) {
610: chomp($userinput);
611: Debug("Request = $userinput\n");
612: &status('Processing '.$hostid{$clientip}.': '.$userinput);
613: my $wasenc=0;
614: alarm(120);
615: # ------------------------------------------------------------ See if encrypted
616: if ($userinput =~ /^enc/) {
617: if ($cipher) {
618: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
619: $userinput='';
620: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
621: $userinput.=
622: $cipher->decrypt(
623: pack("H16",substr($encinput,$encidx,16))
624: );
625: }
626: $userinput=substr($userinput,0,$cmdlength);
627: $wasenc=1;
628: }
629: }
630:
631: # ------------------------------------------------------------- Normal commands
632: # ------------------------------------------------------------------------ ping
633: if ($userinput =~ /^ping/) {
634: print $client "$perlvar{'lonHostID'}\n";
635: # ------------------------------------------------------------------------ pong
636: } elsif ($userinput =~ /^pong/) {
637: $reply=reply("ping",$hostid{$clientip});
638: print $client "$perlvar{'lonHostID'}:$reply\n";
639: # ------------------------------------------------------------------------ ekey
640: } elsif ($userinput =~ /^ekey/) {
641: my $buildkey=time.$$.int(rand 100000);
642: $buildkey=~tr/1-6/A-F/;
643: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
644: my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
645: $key=~tr/a-z/A-Z/;
646: $key=~tr/G-P/0-9/;
647: $key=~tr/Q-Z/0-9/;
648: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
649: $key=substr($key,0,32);
650: my $cipherkey=pack("H32",$key);
651: $cipher=new IDEA $cipherkey;
652: print $client "$buildkey\n";
653: # ------------------------------------------------------------------------ load
654: } elsif ($userinput =~ /^load/) {
655: my $loadavg;
656: {
657: my $loadfile=IO::File->new('/proc/loadavg');
658: $loadavg=<$loadfile>;
659: }
660: $loadavg =~ s/\s.*//g;
661: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
662: print $client "$loadpercent\n";
663: # ----------------------------------------------------------------- currentauth
664: } elsif ($userinput =~ /^currentauth/) {
665: if ($wasenc==1) {
666: my ($cmd,$udom,$uname)=split(/:/,$userinput);
667: my $result = GetAuthType($udom, $uname);
668: if($result eq "nouser") {
669: print $client "unknown_user\n";
670: }
671: else {
672: print $client "$result\n"
673: }
674: } else {
675: print $client "refused\n";
676: }
677: # ------------------------------------------------------------------------ auth
678: } elsif ($userinput =~ /^auth/) {
679: if ($wasenc==1) {
680: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
681: chomp($upass);
682: $upass=unescape($upass);
683: my $proname=propath($udom,$uname);
684: my $passfilename="$proname/passwd";
685: if (-e $passfilename) {
686: my $pf = IO::File->new($passfilename);
687: my $realpasswd=<$pf>;
688: chomp($realpasswd);
689: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
690: my $pwdcorrect=0;
691: if ($howpwd eq 'internal') {
692: &Debug("Internal auth");
693: $pwdcorrect=
694: (crypt($upass,$contentpwd) eq $contentpwd);
695: } elsif ($howpwd eq 'unix') {
696: &Debug("Unix auth");
697: if((getpwnam($uname))[1] eq "") { #no such user!
698: $pwdcorrect = 0;
699: } else {
700: $contentpwd=(getpwnam($uname))[1];
701: my $pwauth_path="/usr/local/sbin/pwauth";
702: unless ($contentpwd eq 'x') {
703: $pwdcorrect=
704: (crypt($upass,$contentpwd) eq
705: $contentpwd);
706: }
707:
708: elsif (-e $pwauth_path) {
709: open PWAUTH, "|$pwauth_path" or
710: die "Cannot invoke authentication";
711: print PWAUTH "$uname\n$upass\n";
712: close PWAUTH;
713: $pwdcorrect=!$?;
714: }
715: }
716: } elsif ($howpwd eq 'krb4') {
717: $null=pack("C",0);
718: unless ($upass=~/$null/) {
719: my $krb4_error = &Authen::Krb4::get_pw_in_tkt
720: ($uname,"",$contentpwd,'krbtgt',
721: $contentpwd,1,$upass);
722: if (!$krb4_error) {
723: $pwdcorrect = 1;
724: } else {
725: $pwdcorrect=0;
726: # log error if it is not a bad password
727: if ($krb4_error != 62) {
728: &logthis('krb4:'.$uname.','.$contentpwd.','.
729: &Authen::Krb4::get_err_txt($Authen::Krb4::error));
730: }
731: }
732: }
733: } elsif ($howpwd eq 'krb5') {
734: $null=pack("C",0);
735: unless ($upass=~/$null/) {
736: my $krbclient=&Authen::Krb5::parse_name($uname.'@'.$contentpwd);
737: my $krbservice="krbtgt/".$contentpwd."\@".$contentpwd;
738: my $krbserver=&Authen::Krb5::parse_name($krbservice);
739: my $credentials=&Authen::Krb5::cc_default();
740: $credentials->initialize($krbclient);
741: my $krbreturn =
742: &Authen::Krb5::get_in_tkt_with_password(
743: $krbclient,$krbserver,$upass,$credentials);
744: # unless ($krbreturn) {
745: # &logthis("Krb5 Error: ".
746: # &Authen::Krb5::error());
747: # }
748: $pwdcorrect = ($krbreturn == 1);
749: } else { $pwdcorrect=0; }
750: } elsif ($howpwd eq 'localauth') {
751: $pwdcorrect=&localauth::localauth($uname,$upass,
752: $contentpwd);
753: }
754: if ($pwdcorrect) {
755: print $client "authorized\n";
756: } else {
757: print $client "non_authorized\n";
758: }
759: } else {
760: print $client "unknown_user\n";
761: }
762: } else {
763: print $client "refused\n";
764: }
765: # ---------------------------------------------------------------------- passwd
766: } elsif ($userinput =~ /^passwd/) {
767: if ($wasenc==1) {
768: my
769: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
770: chomp($npass);
771: $upass=&unescape($upass);
772: $npass=&unescape($npass);
773: &Debug("Trying to change password for $uname");
774: my $proname=propath($udom,$uname);
775: my $passfilename="$proname/passwd";
776: if (-e $passfilename) {
777: my $realpasswd;
778: { my $pf = IO::File->new($passfilename);
779: $realpasswd=<$pf>; }
780: chomp($realpasswd);
781: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
782: if ($howpwd eq 'internal') {
783: &Debug("internal auth");
784: if (crypt($upass,$contentpwd) eq $contentpwd) {
785: my $salt=time;
786: $salt=substr($salt,6,2);
787: my $ncpass=crypt($npass,$salt);
788: { my $pf = IO::File->new(">$passfilename");
789: print $pf "internal:$ncpass\n"; }
790: &logthis("Result of password change for $uname: pwchange_success");
791: print $client "ok\n";
792: } else {
793: print $client "non_authorized\n";
794: }
795: } elsif ($howpwd eq 'unix') {
796: # Unix means we have to access /etc/password
797: # one way or another.
798: # First: Make sure the current password is
799: # correct
800: &Debug("auth is unix");
801: $contentpwd=(getpwnam($uname))[1];
802: my $pwdcorrect = "0";
803: my $pwauth_path="/usr/local/sbin/pwauth";
804: unless ($contentpwd eq 'x') {
805: $pwdcorrect=
806: (crypt($upass,$contentpwd) eq $contentpwd);
807: } elsif (-e $pwauth_path) {
808: open PWAUTH, "|$pwauth_path" or
809: die "Cannot invoke authentication";
810: print PWAUTH "$uname\n$upass\n";
811: close PWAUTH;
812: &Debug("exited pwauth with $? ($uname,$upass) ");
813: $pwdcorrect=($? == 0);
814: }
815: if ($pwdcorrect) {
816: my $execdir=$perlvar{'lonDaemons'};
817: &Debug("Opening lcpasswd pipeline");
818: my $pf = IO::File->new("|$execdir/lcpasswd > /home/www/lcpasswd.log");
819: print $pf "$uname\n$npass\n$npass\n";
820: close $pf;
821: my $err = $?;
822: my $result = ($err>0 ? 'pwchange_failure'
823: : 'ok');
824: &logthis("Result of password change for $uname: ".
825: &lcpasswdstrerror($?));
826: print $client "$result\n";
827: } else {
828: print $client "non_authorized\n";
829: }
830: } else {
831: print $client "auth_mode_error\n";
832: }
833: } else {
834: print $client "unknown_user\n";
835: }
836: } else {
837: print $client "refused\n";
838: }
839: # -------------------------------------------------------------------- makeuser
840: } elsif ($userinput =~ /^makeuser/) {
841: &Debug("Make user received");
842: my $oldumask=umask(0077);
843: if ($wasenc==1) {
844: my
845: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
846: &Debug("cmd =".$cmd." $udom =".$udom.
847: " uname=".$uname);
848: chomp($npass);
849: $npass=&unescape($npass);
850: my $proname=propath($udom,$uname);
851: my $passfilename="$proname/passwd";
852: &Debug("Password file created will be:".
853: $passfilename);
854: if (-e $passfilename) {
855: print $client "already_exists\n";
856: } elsif ($udom ne $perlvar{'lonDefDomain'}) {
857: print $client "not_right_domain\n";
858: } else {
859: @fpparts=split(/\//,$proname);
860: $fpnow=$fpparts[0].'/'.$fpparts[1].'/'.$fpparts[2];
861: $fperror='';
862: for ($i=3;$i<=$#fpparts;$i++) {
863: $fpnow.='/'.$fpparts[$i];
864: unless (-e $fpnow) {
865: unless (mkdir($fpnow,0777)) {
866: $fperror="error: ".($!+0)
867: ." mkdir failed while attempting "
868: ."makeuser\n";
869: }
870: }
871: }
872: unless ($fperror) {
873: my $result=&make_passwd_file($uname, $umode,$npass,
874: $passfilename);
875: print $client $result;
876: } else {
877: print $client "$fperror\n";
878: }
879: }
880: } else {
881: print $client "refused\n";
882: }
883: umask($oldumask);
884: # -------------------------------------------------------------- changeuserauth
885: } elsif ($userinput =~ /^changeuserauth/) {
886: &Debug("Changing authorization");
887: if ($wasenc==1) {
888: my
889: ($cmd,$udom,$uname,$umode,$npass)=split(/:/,$userinput);
890: chomp($npass);
891: &Debug("cmd = ".$cmd." domain= ".$udom.
892: "uname =".$uname." umode= ".$umode);
893: $npass=&unescape($npass);
894: my $proname=&propath($udom,$uname);
895: my $passfilename="$proname/passwd";
896: if ($udom ne $perlvar{'lonDefDomain'}) {
897: print $client "not_right_domain\n";
898: } else {
899: my $result=&make_passwd_file($uname, $umode,$npass,
900: $passfilename);
901: print $client $result;
902: }
903: } else {
904: print $client "refused\n";
905: }
906: # ------------------------------------------------------------------------ home
907: } elsif ($userinput =~ /^home/) {
908: my ($cmd,$udom,$uname)=split(/:/,$userinput);
909: chomp($uname);
910: my $proname=propath($udom,$uname);
911: if (-e $proname) {
912: print $client "found\n";
913: } else {
914: print $client "not_found\n";
915: }
916: # ---------------------------------------------------------------------- update
917: } elsif ($userinput =~ /^update/) {
918: my ($cmd,$fname)=split(/:/,$userinput);
919: my $ownership=ishome($fname);
920: if ($ownership eq 'not_owner') {
921: if (-e $fname) {
922: my ($dev,$ino,$mode,$nlink,
923: $uid,$gid,$rdev,$size,
924: $atime,$mtime,$ctime,
925: $blksize,$blocks)=stat($fname);
926: $now=time;
927: $since=$now-$atime;
928: if ($since>$perlvar{'lonExpire'}) {
929: $reply=
930: reply("unsub:$fname","$hostid{$clientip}");
931: unlink("$fname");
932: } else {
933: my $transname="$fname.in.transfer";
934: my $remoteurl=
935: reply("sub:$fname","$hostid{$clientip}");
936: my $response;
937: {
938: my $ua=new LWP::UserAgent;
939: my $request=new HTTP::Request('GET',"$remoteurl");
940: $response=$ua->request($request,$transname);
941: }
942: if ($response->is_error()) {
943: unlink($transname);
944: my $message=$response->status_line;
945: &logthis(
946: "LWP GET: $message for $fname ($remoteurl)");
947: } else {
948: if ($remoteurl!~/\.meta$/) {
949: my $ua=new LWP::UserAgent;
950: my $mrequest=
951: new HTTP::Request('GET',$remoteurl.'.meta');
952: my $mresponse=
953: $ua->request($mrequest,$fname.'.meta');
954: if ($mresponse->is_error()) {
955: unlink($fname.'.meta');
956: }
957: }
958: rename($transname,$fname);
959: }
960: }
961: print $client "ok\n";
962: } else {
963: print $client "not_found\n";
964: }
965: } else {
966: print $client "rejected\n";
967: }
968: # -------------------------------------- fetch a user file from a remote server
969: } elsif ($userinput =~ /^fetchuserfile/) {
970: my ($cmd,$fname)=split(/:/,$userinput);
971: my ($udom,$uname,$ufile)=split(/\//,$fname);
972: my $udir=propath($udom,$uname).'/userfiles';
973: unless (-e $udir) { mkdir($udir,0770); }
974: if (-e $udir) {
975: $ufile=~s/^[\.\~]+//;
976: $ufile=~s/\///g;
977: my $transname=$udir.'/'.$ufile;
978: my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
979: my $response;
980: {
981: my $ua=new LWP::UserAgent;
982: my $request=new HTTP::Request('GET',"$remoteurl");
983: $response=$ua->request($request,$transname);
984: }
985: if ($response->is_error()) {
986: unlink($transname);
987: my $message=$response->status_line;
988: &logthis(
989: "LWP GET: $message for $fname ($remoteurl)");
990: print $client "failed\n";
991: } else {
992: print $client "ok\n";
993: }
994: } else {
995: print $client "not_home\n";
996: }
997: # ------------------------------------------ authenticate access to a user file
998: } elsif ($userinput =~ /^tokenauthuserfile/) {
999: my ($cmd,$fname,$session)=split(/:/,$userinput);
1000: chomp($session);
1001: $reply='non_auth';
1002: if (open(ENVIN,$perlvar{'lonIDsDir'}.'/'.
1003: $session.'.id')) {
1004: while ($line=<ENVIN>) {
1005: if ($line=~/userfile\.$fname\=/) { $reply='ok'; }
1006: }
1007: close(ENVIN);
1008: print $client $reply."\n";
1009: } else {
1010: print $client "invalid_token\n";
1011: }
1012: # ----------------------------------------------------------------- unsubscribe
1013: } elsif ($userinput =~ /^unsub/) {
1014: my ($cmd,$fname)=split(/:/,$userinput);
1015: if (-e $fname) {
1016: print $client &unsub($client,$fname,$clientip);
1017: } else {
1018: print $client "not_found\n";
1019: }
1020: # ------------------------------------------------------------------- subscribe
1021: } elsif ($userinput =~ /^sub/) {
1022: print $client &subscribe($userinput,$clientip);
1023: # ------------------------------------------------------------- current version
1024: } elsif ($userinput =~ /^currentversion/) {
1025: my ($cmd,$fname)=split(/:/,$userinput);
1026: print $client ¤tversion($fname)."\n";
1027: # ------------------------------------------------------------------------- log
1028: } elsif ($userinput =~ /^log/) {
1029: my ($cmd,$udom,$uname,$what)=split(/:/,$userinput);
1030: chomp($what);
1031: my $proname=propath($udom,$uname);
1032: my $now=time;
1033: {
1034: my $hfh;
1035: if ($hfh=IO::File->new(">>$proname/activity.log")) {
1036: print $hfh "$now:$hostid{$clientip}:$what\n";
1037: print $client "ok\n";
1038: } else {
1039: print $client "error: ".($!+0)
1040: ." IO::File->new Failed "
1041: ."while attempting log\n";
1042: }
1043: }
1044: # ------------------------------------------------------------------------- put
1045: } elsif ($userinput =~ /^put/) {
1046: my ($cmd,$udom,$uname,$namespace,$what)
1047: =split(/:/,$userinput);
1048: $namespace=~s/\//\_/g;
1049: $namespace=~s/\W//g;
1050: if ($namespace ne 'roles') {
1051: chomp($what);
1052: my $proname=propath($udom,$uname);
1053: my $now=time;
1054: unless ($namespace=~/^nohist\_/) {
1055: my $hfh;
1056: if (
1057: $hfh=IO::File->new(">>$proname/$namespace.hist")
1058: ) { print $hfh "P:$now:$what\n"; }
1059: }
1060: my @pairs=split(/\&/,$what);
1061: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1062: foreach $pair (@pairs) {
1063: ($key,$value)=split(/=/,$pair);
1064: $hash{$key}=$value;
1065: }
1066: if (untie(%hash)) {
1067: print $client "ok\n";
1068: } else {
1069: print $client "error: ".($!+0)
1070: ." untie(GDBM) failed ".
1071: "while attempting put\n";
1072: }
1073: } else {
1074: print $client "error: ".($!)
1075: ." tie(GDBM) Failed ".
1076: "while attempting put\n";
1077: }
1078: } else {
1079: print $client "refused\n";
1080: }
1081: # -------------------------------------------------------------------- rolesput
1082: } elsif ($userinput =~ /^rolesput/) {
1083: &Debug("rolesput");
1084: if ($wasenc==1) {
1085: my ($cmd,$exedom,$exeuser,$udom,$uname,$what)
1086: =split(/:/,$userinput);
1087: &Debug("cmd = ".$cmd." exedom= ".$exedom.
1088: "user = ".$exeuser." udom=".$udom.
1089: "what = ".$what);
1090: my $namespace='roles';
1091: chomp($what);
1092: my $proname=propath($udom,$uname);
1093: my $now=time;
1094: {
1095: my $hfh;
1096: if (
1097: $hfh=IO::File->new(">>$proname/$namespace.hist")
1098: ) {
1099: print $hfh "P:$now:$exedom:$exeuser:$what\n";
1100: }
1101: }
1102: my @pairs=split(/\&/,$what);
1103: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1104: foreach $pair (@pairs) {
1105: ($key,$value)=split(/=/,$pair);
1106: &ManagePermissions($key, $udom, $uname,
1107: &GetAuthType( $udom,
1108: $uname));
1109: $hash{$key}=$value;
1110:
1111: }
1112: if (untie(%hash)) {
1113: print $client "ok\n";
1114: } else {
1115: print $client "error: ".($!+0)
1116: ." untie(GDBM) Failed ".
1117: "while attempting rolesput\n";
1118: }
1119: } else {
1120: print $client "error: ".($!+0)
1121: ." tie(GDBM) Failed ".
1122: "while attempting rolesput\n";
1123: }
1124: } else {
1125: print $client "refused\n";
1126: }
1127: # ------------------------------------------------------------------------- get
1128: } elsif ($userinput =~ /^get/) {
1129: my ($cmd,$udom,$uname,$namespace,$what)
1130: =split(/:/,$userinput);
1131: $namespace=~s/\//\_/g;
1132: $namespace=~s/\W//g;
1133: chomp($what);
1134: my @queries=split(/\&/,$what);
1135: my $proname=propath($udom,$uname);
1136: my $qresult='';
1137: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1138: for ($i=0;$i<=$#queries;$i++) {
1139: $qresult.="$hash{$queries[$i]}&";
1140: }
1141: if (untie(%hash)) {
1142: $qresult=~s/\&$//;
1143: print $client "$qresult\n";
1144: } else {
1145: print $client "error: ".($!+0)
1146: ." untie(GDBM) Failed ".
1147: "while attempting get\n";
1148: }
1149: } else {
1150: if ($!+0 == 2) {
1151: print $client "error:No such file or ".
1152: "GDBM reported bad block error\n";
1153: } else {
1154: print $client "error: ".($!+0)
1155: ." tie(GDBM) Failed ".
1156: "while attempting get\n";
1157: }
1158: }
1159: # ------------------------------------------------------------------------ eget
1160: } elsif ($userinput =~ /^eget/) {
1161: my ($cmd,$udom,$uname,$namespace,$what)
1162: =split(/:/,$userinput);
1163: $namespace=~s/\//\_/g;
1164: $namespace=~s/\W//g;
1165: chomp($what);
1166: my @queries=split(/\&/,$what);
1167: my $proname=propath($udom,$uname);
1168: my $qresult='';
1169: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1170: for ($i=0;$i<=$#queries;$i++) {
1171: $qresult.="$hash{$queries[$i]}&";
1172: }
1173: if (untie(%hash)) {
1174: $qresult=~s/\&$//;
1175: if ($cipher) {
1176: my $cmdlength=length($qresult);
1177: $qresult.=" ";
1178: my $encqresult='';
1179: for
1180: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
1181: $encqresult.=
1182: unpack("H16",
1183: $cipher->encrypt(substr($qresult,$encidx,8)));
1184: }
1185: print $client "enc:$cmdlength:$encqresult\n";
1186: } else {
1187: print $client "error:no_key\n";
1188: }
1189: } else {
1190: print $client "error: ".($!+0)
1191: ." untie(GDBM) Failed ".
1192: "while attempting eget\n";
1193: }
1194: } else {
1195: print $client "error: ".($!+0)
1196: ." tie(GDBM) Failed ".
1197: "while attempting eget\n";
1198: }
1199: # ------------------------------------------------------------------------- del
1200: } elsif ($userinput =~ /^del/) {
1201: my ($cmd,$udom,$uname,$namespace,$what)
1202: =split(/:/,$userinput);
1203: $namespace=~s/\//\_/g;
1204: $namespace=~s/\W//g;
1205: chomp($what);
1206: my $proname=propath($udom,$uname);
1207: my $now=time;
1208: unless ($namespace=~/^nohist\_/) {
1209: my $hfh;
1210: if (
1211: $hfh=IO::File->new(">>$proname/$namespace.hist")
1212: ) { print $hfh "D:$now:$what\n"; }
1213: }
1214: my @keys=split(/\&/,$what);
1215: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1216: foreach $key (@keys) {
1217: delete($hash{$key});
1218: }
1219: if (untie(%hash)) {
1220: print $client "ok\n";
1221: } else {
1222: print $client "error: ".($!+0)
1223: ." untie(GDBM) Failed ".
1224: "while attempting del\n";
1225: }
1226: } else {
1227: print $client "error: ".($!+0)
1228: ." tie(GDBM) Failed ".
1229: "while attempting del\n";
1230: }
1231: # ------------------------------------------------------------------------ keys
1232: } elsif ($userinput =~ /^keys/) {
1233: my ($cmd,$udom,$uname,$namespace)
1234: =split(/:/,$userinput);
1235: $namespace=~s/\//\_/g;
1236: $namespace=~s/\W//g;
1237: my $proname=propath($udom,$uname);
1238: my $qresult='';
1239: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1240: foreach $key (keys %hash) {
1241: $qresult.="$key&";
1242: }
1243: if (untie(%hash)) {
1244: $qresult=~s/\&$//;
1245: print $client "$qresult\n";
1246: } else {
1247: print $client "error: ".($!+0)
1248: ." untie(GDBM) Failed ".
1249: "while attempting keys\n";
1250: }
1251: } else {
1252: print $client "error: ".($!+0)
1253: ." tie(GDBM) Failed ".
1254: "while attempting keys\n";
1255: }
1256: # ----------------------------------------------------------------- dumpcurrent
1257: } elsif ($userinput =~ /^currentdump/) {
1258: my ($cmd,$udom,$uname,$namespace)
1259: =split(/:/,$userinput);
1260: $namespace=~s/\//\_/g;
1261: $namespace=~s/\W//g;
1262: my $qresult='';
1263: my $proname=propath($udom,$uname);
1264: if (tie(%hash,'GDBM_File',
1265: "$proname/$namespace.db",
1266: &GDBM_READER(),0640)) {
1267: # Structure of %data:
1268: # $data{$symb}->{$parameter}=$value;
1269: # $data{$symb}->{'v.'.$parameter}=$version;
1270: # since $parameter will be unescaped, we do not
1271: # have to worry about silly parameter names...
1272: my %data = ();
1273: while (my ($key,$value) = each(%hash)) {
1274: my ($v,$symb,$param) = split(/:/,$key);
1275: next if ($v eq 'version' || $symb eq 'keys');
1276: next if (exists($data{$symb}) &&
1277: exists($data{$symb}->{$param}) &&
1278: $data{$symb}->{'v.'.$param} > $v);
1279: $data{$symb}->{$param}=$value;
1280: $data{$symb}->{'v.'.$param}=$v;
1281: }
1282: if (untie(%hash)) {
1283: while (my ($symb,$param_hash) = each(%data)) {
1284: while(my ($param,$value) = each (%$param_hash)){
1285: next if ($param =~ /^v\./);
1286: $qresult.=$symb.':'.$param.'='.$value.'&';
1287: }
1288: }
1289: chop($qresult);
1290: print $client "$qresult\n";
1291: } else {
1292: print $client "error: ".($!+0)
1293: ." untie(GDBM) Failed ".
1294: "while attempting currentdump\n";
1295: }
1296: } else {
1297: print $client "error: ".($!+0)
1298: ." tie(GDBM) Failed ".
1299: "while attempting currentdump\n";
1300: }
1301: # ------------------------------------------------------------------------ dump
1302: } elsif ($userinput =~ /^dump/) {
1303: my ($cmd,$udom,$uname,$namespace,$regexp)
1304: =split(/:/,$userinput);
1305: $namespace=~s/\//\_/g;
1306: $namespace=~s/\W//g;
1307: if (defined($regexp)) {
1308: $regexp=&unescape($regexp);
1309: } else {
1310: $regexp='.';
1311: }
1312: my $qresult='';
1313: my $proname=propath($udom,$uname);
1314: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER(),0640)) {
1315: study($regexp);
1316: while (($key,$value) = each(%hash)) {
1317: if ($regexp eq '.') {
1318: $qresult.=$key.'='.$value.'&';
1319: } else {
1320: my $unescapeKey = &unescape($key);
1321: if (eval('$unescapeKey=~/$regexp/')) {
1322: $qresult.="$key=$value&";
1323: }
1324: }
1325: }
1326: if (untie(%hash)) {
1327: chop($qresult);
1328: print $client "$qresult\n";
1329: } else {
1330: print $client "error: ".($!+0)
1331: ." untie(GDBM) Failed ".
1332: "while attempting dump\n";
1333: }
1334: } else {
1335: print $client "error: ".($!+0)
1336: ." tie(GDBM) Failed ".
1337: "while attempting dump\n";
1338: }
1339: # ----------------------------------------------------------------------- store
1340: } elsif ($userinput =~ /^store/) {
1341: my ($cmd,$udom,$uname,$namespace,$rid,$what)
1342: =split(/:/,$userinput);
1343: $namespace=~s/\//\_/g;
1344: $namespace=~s/\W//g;
1345: if ($namespace ne 'roles') {
1346: chomp($what);
1347: my $proname=propath($udom,$uname);
1348: my $now=time;
1349: unless ($namespace=~/^nohist\_/) {
1350: my $hfh;
1351: if (
1352: $hfh=IO::File->new(">>$proname/$namespace.hist")
1353: ) { print $hfh "P:$now:$rid:$what\n"; }
1354: }
1355: my @pairs=split(/\&/,$what);
1356:
1357: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_WRCREAT,0640)) {
1358: my @previouskeys=split(/&/,$hash{"keys:$rid"});
1359: my $key;
1360: $hash{"version:$rid"}++;
1361: my $version=$hash{"version:$rid"};
1362: my $allkeys='';
1363: foreach $pair (@pairs) {
1364: ($key,$value)=split(/=/,$pair);
1365: $allkeys.=$key.':';
1366: $hash{"$version:$rid:$key"}=$value;
1367: }
1368: $hash{"$version:$rid:timestamp"}=$now;
1369: $allkeys.='timestamp';
1370: $hash{"$version:keys:$rid"}=$allkeys;
1371: if (untie(%hash)) {
1372: print $client "ok\n";
1373: } else {
1374: print $client "error: ".($!+0)
1375: ." untie(GDBM) Failed ".
1376: "while attempting store\n";
1377: }
1378: } else {
1379: print $client "error: ".($!+0)
1380: ." tie(GDBM) Failed ".
1381: "while attempting store\n";
1382: }
1383: } else {
1384: print $client "refused\n";
1385: }
1386: # --------------------------------------------------------------------- restore
1387: } elsif ($userinput =~ /^restore/) {
1388: my ($cmd,$udom,$uname,$namespace,$rid)
1389: =split(/:/,$userinput);
1390: $namespace=~s/\//\_/g;
1391: $namespace=~s/\W//g;
1392: chomp($rid);
1393: my $proname=propath($udom,$uname);
1394: my $qresult='';
1395: if (tie(%hash,'GDBM_File',"$proname/$namespace.db",&GDBM_READER,0640)) {
1396: my $version=$hash{"version:$rid"};
1397: $qresult.="version=$version&";
1398: my $scope;
1399: for ($scope=1;$scope<=$version;$scope++) {
1400: my $vkeys=$hash{"$scope:keys:$rid"};
1401: my @keys=split(/:/,$vkeys);
1402: my $key;
1403: $qresult.="$scope:keys=$vkeys&";
1404: foreach $key (@keys) {
1405: $qresult.="$scope:$key=".$hash{"$scope:$rid:$key"}."&";
1406: }
1407: }
1408: if (untie(%hash)) {
1409: $qresult=~s/\&$//;
1410: print $client "$qresult\n";
1411: } else {
1412: print $client "error: ".($!+0)
1413: ." untie(GDBM) Failed ".
1414: "while attempting restore\n";
1415: }
1416: } else {
1417: print $client "error: ".($!+0)
1418: ." tie(GDBM) Failed ".
1419: "while attempting restore\n";
1420: }
1421: # -------------------------------------------------------------------- chatsend
1422: } elsif ($userinput =~ /^chatsend/) {
1423: my ($cmd,$cdom,$cnum,$newpost)=split(/\:/,$userinput);
1424: &chatadd($cdom,$cnum,$newpost);
1425: print $client "ok\n";
1426: # -------------------------------------------------------------------- chatretr
1427: } elsif ($userinput =~ /^chatretr/) {
1428: my ($cmd,$cdom,$cnum)=split(/\:/,$userinput);
1429: my $reply='';
1430: foreach (&getchat($cdom,$cnum)) {
1431: $reply.=&escape($_).':';
1432: }
1433: $reply=~s/\:$//;
1434: print $client $reply."\n";
1435: # ------------------------------------------------------------------- querysend
1436: } elsif ($userinput =~ /^querysend/) {
1437: my ($cmd,$query,
1438: $arg1,$arg2,$arg3)=split(/\:/,$userinput);
1439: $query=~s/\n*$//g;
1440: print $client "".
1441: sqlreply("$hostid{$clientip}\&$query".
1442: "\&$arg1"."\&$arg2"."\&$arg3")."\n";
1443: # ------------------------------------------------------------------ queryreply
1444: } elsif ($userinput =~ /^queryreply/) {
1445: my ($cmd,$id,$reply)=split(/:/,$userinput);
1446: my $store;
1447: my $execdir=$perlvar{'lonDaemons'};
1448: if ($store=IO::File->new(">$execdir/tmp/$id")) {
1449: $reply=~s/\&/\n/g;
1450: print $store $reply;
1451: close $store;
1452: my $store2=IO::File->new(">$execdir/tmp/$id.end");
1453: print $store2 "done\n";
1454: close $store2;
1455: print $client "ok\n";
1456: }
1457: else {
1458: print $client "error: ".($!+0)
1459: ." IO::File->new Failed ".
1460: "while attempting queryreply\n";
1461: }
1462: # ----------------------------------------------------------------------- idput
1463: } elsif ($userinput =~ /^idput/) {
1464: my ($cmd,$udom,$what)=split(/:/,$userinput);
1465: chomp($what);
1466: $udom=~s/\W//g;
1467: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1468: my $now=time;
1469: {
1470: my $hfh;
1471: if (
1472: $hfh=IO::File->new(">>$proname.hist")
1473: ) { print $hfh "P:$now:$what\n"; }
1474: }
1475: my @pairs=split(/\&/,$what);
1476: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_WRCREAT,0640)) {
1477: foreach $pair (@pairs) {
1478: ($key,$value)=split(/=/,$pair);
1479: $hash{$key}=$value;
1480: }
1481: if (untie(%hash)) {
1482: print $client "ok\n";
1483: } else {
1484: print $client "error: ".($!+0)
1485: ." untie(GDBM) Failed ".
1486: "while attempting idput\n";
1487: }
1488: } else {
1489: print $client "error: ".($!+0)
1490: ." tie(GDBM) Failed ".
1491: "while attempting idput\n";
1492: }
1493: # ----------------------------------------------------------------------- idget
1494: } elsif ($userinput =~ /^idget/) {
1495: my ($cmd,$udom,$what)=split(/:/,$userinput);
1496: chomp($what);
1497: $udom=~s/\W//g;
1498: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
1499: my @queries=split(/\&/,$what);
1500: my $qresult='';
1501: if (tie(%hash,'GDBM_File',"$proname.db",&GDBM_READER,0640)) {
1502: for ($i=0;$i<=$#queries;$i++) {
1503: $qresult.="$hash{$queries[$i]}&";
1504: }
1505: if (untie(%hash)) {
1506: $qresult=~s/\&$//;
1507: print $client "$qresult\n";
1508: } else {
1509: print $client "error: ".($!+0)
1510: ." untie(GDBM) Failed ".
1511: "while attempting idget\n";
1512: }
1513: } else {
1514: print $client "error: ".($!+0)
1515: ." tie(GDBM) Failed ".
1516: "while attempting idget\n";
1517: }
1518: # ---------------------------------------------------------------------- tmpput
1519: } elsif ($userinput =~ /^tmpput/) {
1520: my ($cmd,$what)=split(/:/,$userinput);
1521: my $store;
1522: $tmpsnum++;
1523: my $id=$$.'_'.$clientip.'_'.$tmpsnum;
1524: $id=~s/\W/\_/g;
1525: $what=~s/\n//g;
1526: my $execdir=$perlvar{'lonDaemons'};
1527: if ($store=IO::File->new(">$execdir/tmp/$id.tmp")) {
1528: print $store $what;
1529: close $store;
1530: print $client "$id\n";
1531: }
1532: else {
1533: print $client "error: ".($!+0)
1534: ."IO::File->new Failed ".
1535: "while attempting tmpput\n";
1536: }
1537:
1538: # ---------------------------------------------------------------------- tmpget
1539: } elsif ($userinput =~ /^tmpget/) {
1540: my ($cmd,$id)=split(/:/,$userinput);
1541: chomp($id);
1542: $id=~s/\W/\_/g;
1543: my $store;
1544: my $execdir=$perlvar{'lonDaemons'};
1545: if ($store=IO::File->new("$execdir/tmp/$id.tmp")) {
1546: my $reply=<$store>;
1547: print $client "$reply\n";
1548: close $store;
1549: }
1550: else {
1551: print $client "error: ".($!+0)
1552: ."IO::File->new Failed ".
1553: "while attempting tmpget\n";
1554: }
1555:
1556: # ---------------------------------------------------------------------- tmpdel
1557: } elsif ($userinput =~ /^tmpdel/) {
1558: my ($cmd,$id)=split(/:/,$userinput);
1559: chomp($id);
1560: $id=~s/\W/\_/g;
1561: my $execdir=$perlvar{'lonDaemons'};
1562: if (unlink("$execdir/tmp/$id.tmp")) {
1563: print $client "ok\n";
1564: } else {
1565: print $client "error: ".($!+0)
1566: ."Unlink tmp Failed ".
1567: "while attempting tmpdel\n";
1568: }
1569: # -------------------------------------------------------------------------- ls
1570: } elsif ($userinput =~ /^ls/) {
1571: my ($cmd,$ulsdir)=split(/:/,$userinput);
1572: my $ulsout='';
1573: my $ulsfn;
1574: if (-e $ulsdir) {
1575: if(-d $ulsdir) {
1576: if (opendir(LSDIR,$ulsdir)) {
1577: while ($ulsfn=readdir(LSDIR)) {
1578: my @ulsstats=stat($ulsdir.'/'.$ulsfn);
1579: $ulsout.=$ulsfn.'&'.
1580: join('&',@ulsstats).':';
1581: }
1582: closedir(LSDIR);
1583: }
1584: } else {
1585: my @ulsstats=stat($ulsdir);
1586: $ulsout.=$ulsfn.'&'.join('&',@ulsstats).':';
1587: }
1588: } else {
1589: $ulsout='no_such_dir';
1590: }
1591: if ($ulsout eq '') { $ulsout='empty'; }
1592: print $client "$ulsout\n";
1593: # ------------------------------------------------------------------ Hanging up
1594: } elsif (($userinput =~ /^exit/) ||
1595: ($userinput =~ /^init/)) {
1596: &logthis(
1597: "Client $clientip ($hostid{$clientip}) hanging up: $userinput");
1598: print $client "bye\n";
1599: $client->close();
1600: last;
1601: # ------------------------------------------------------------- unknown command
1602: } else {
1603: # unknown command
1604: print $client "unknown_cmd\n";
1605: }
1606: # -------------------------------------------------------------------- complete
1607: alarm(0);
1608: &status('Listening to '.$hostid{$clientip});
1609: }
1610: # --------------------------------------------- client unknown or fishy, refuse
1611: } else {
1612: print $client "refused\n";
1613: $client->close();
1614: &logthis("<font color=blue>WARNING: "
1615: ."Rejected client $clientip, closing connection</font>");
1616: }
1617: }
1618:
1619: # =============================================================================
1620:
1621: &logthis("<font color=red>CRITICAL: "
1622: ."Disconnect from $clientip ($hostid{$clientip})</font>");
1623:
1624:
1625: # this exit is VERY important, otherwise the child will become
1626: # a producer of more and more children, forking yourself into
1627: # process death.
1628: exit;
1629:
1630: }
1631:
1632:
1633: #
1634: # Checks to see if the input roleput request was to set
1635: # an author role. If so, invokes the lchtmldir script to set
1636: # up a correct public_html
1637: # Parameters:
1638: # request - The request sent to the rolesput subchunk.
1639: # We're looking for /domain/_au
1640: # domain - The domain in which the user is having roles doctored.
1641: # user - Name of the user for which the role is being put.
1642: # authtype - The authentication type associated with the user.
1643: #
1644: sub ManagePermissions
1645: {
1646: my $request = shift;
1647: my $domain = shift;
1648: my $user = shift;
1649: my $authtype= shift;
1650:
1651: # See if the request is of the form /$domain/_au
1652:
1653: if($request =~ /^(\/$domain\/_au)$/) { # It's an author rolesput...
1654: my $execdir = $perlvar{'lonDaemons'};
1655: my $userhome= "/home/$user" ;
1656: Debug("system $execdir/lchtmldir $userhome $system $authtype");
1657: system("$execdir/lchtmldir $userhome $user $authtype");
1658: }
1659: }
1660: #
1661: # GetAuthType - Determines the authorization type of a user in a domain.
1662:
1663: # Returns the authorization type or nouser if there is no such user.
1664: #
1665: sub GetAuthType
1666: {
1667: my $domain = shift;
1668: my $user = shift;
1669:
1670: Debug("GetAuthType( $domain, $user ) \n");
1671: my $proname = &propath($domain, $user);
1672: my $passwdfile = "$proname/passwd";
1673: if( -e $passwdfile ) {
1674: my $pf = IO::File->new($passwdfile);
1675: my $realpassword = <$pf>;
1676: chomp($realpassword);
1677: Debug("Password info = $realpassword\n");
1678: my ($authtype, $contentpwd) = split(/:/, $realpassword);
1679: Debug("Authtype = $authtype, content = $contentpwd\n");
1680: my $availinfo = '';
1681: if($authtype eq 'krb4' or $authtype eq 'krb5') {
1682: $availinfo = $contentpwd;
1683: }
1684:
1685: return "$authtype:$availinfo";
1686: }
1687: else {
1688: Debug("Returning nouser");
1689: return "nouser";
1690: }
1691: }
1692:
1693: sub addline {
1694: my ($fname,$hostid,$ip,$newline)=@_;
1695: my $contents;
1696: my $found=0;
1697: my $expr='^'.$hostid.':'.$ip.':';
1698: $expr =~ s/\./\\\./g;
1699: if ($sh=IO::File->new("$fname.subscription")) {
1700: while (my $subline=<$sh>) {
1701: if ($subline !~ /$expr/) {$contents.= $subline;} else {$found=1;}
1702: }
1703: $sh->close();
1704: }
1705: $sh=IO::File->new(">$fname.subscription");
1706: if ($contents) { print $sh $contents; }
1707: if ($newline) { print $sh $newline; }
1708: $sh->close();
1709: return $found;
1710: }
1711:
1712: sub getchat {
1713: my ($cdom,$cname)=@_;
1714: my %hash;
1715: my $proname=&propath($cdom,$cname);
1716: my @entries=();
1717: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1718: &GDBM_READER(),0640)) {
1719: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1720: untie %hash;
1721: }
1722: return @entries;
1723: }
1724:
1725: sub chatadd {
1726: my ($cdom,$cname,$newchat)=@_;
1727: my %hash;
1728: my $proname=&propath($cdom,$cname);
1729: my @entries=();
1730: if (tie(%hash,'GDBM_File',"$proname/nohist_chatroom.db",
1731: &GDBM_WRCREAT(),0640)) {
1732: @entries=map { $_.':'.$hash{$_} } sort keys %hash;
1733: my $time=time;
1734: my ($lastid)=($entries[$#entries]=~/^(\w+)\:/);
1735: my ($thentime,$idnum)=split(/\_/,$lastid);
1736: my $newid=$time.'_000000';
1737: if ($thentime==$time) {
1738: $idnum=~s/^0+//;
1739: $idnum++;
1740: $idnum=substr('000000'.$idnum,-6,6);
1741: $newid=$time.'_'.$idnum;
1742: }
1743: $hash{$newid}=$newchat;
1744: my $expired=$time-3600;
1745: foreach (keys %hash) {
1746: my ($thistime)=($_=~/(\d+)\_/);
1747: if ($thistime<$expired) {
1748: delete $hash{$_};
1749: }
1750: }
1751: untie %hash;
1752: }
1753: }
1754:
1755: sub unsub {
1756: my ($fname,$clientip)=@_;
1757: my $result;
1758: if (unlink("$fname.$hostid{$clientip}")) {
1759: $result="ok\n";
1760: } else {
1761: $result="not_subscribed\n";
1762: }
1763: if (-e "$fname.subscription") {
1764: my $found=&addline($fname,$hostid{$clientip},$clientip,'');
1765: if ($found) { $result="ok\n"; }
1766: } else {
1767: if ($result != "ok\n") { $result="not_subscribed\n"; }
1768: }
1769: return $result;
1770: }
1771:
1772: sub currentversion {
1773: my $fname=shift;
1774: my $version=-1;
1775: my $ulsdir='';
1776: if ($fname=~/^(.+)\/[^\/]+$/) {
1777: $ulsdir=$1;
1778: }
1779: my ($fnamere1,$fnamere2);
1780: # remove version if already specified
1781: $fname=~s/\.\d+\.(\w+(?:\.meta)*)$/\.$1/;
1782: # get the bits that go before and after the version number
1783: if ( $fname=~/^(.*\.)(\w+(?:\.meta)*)$/ ) {
1784: $fnamere1=$1;
1785: $fnamere2='.'.$2;
1786: }
1787: if (-e $fname) { $version=1; }
1788: if (-e $ulsdir) {
1789: if(-d $ulsdir) {
1790: if (opendir(LSDIR,$ulsdir)) {
1791:
1792: while ($ulsfn=readdir(LSDIR)) {
1793: # see if this is a regular file (ignore links produced earlier)
1794: my $thisfile=$ulsdir.'/'.$ulsfn;
1795: unless (-l $thisfile) {
1796: if ($thisfile=~/\Q$fnamere1\E(\d+)\Q$fnamere2\E/) {
1797: if ($1>$version) { $version=$1; }
1798: }
1799: }
1800: }
1801: closedir(LSDIR);
1802: $version++;
1803: }
1804: }
1805: }
1806: return $version;
1807: }
1808:
1809: sub thisversion {
1810: my $fname=shift;
1811: my $version=-1;
1812: if ($fname=~/\.(\d+)\.\w+(?:\.meta)*$/) {
1813: $version=$1;
1814: }
1815: return $version;
1816: }
1817:
1818: sub subscribe {
1819: my ($userinput,$clientip)=@_;
1820: my $result;
1821: my ($cmd,$fname)=split(/:/,$userinput);
1822: my $ownership=&ishome($fname);
1823: if ($ownership eq 'owner') {
1824: # explitly asking for the current version?
1825: unless (-e $fname) {
1826: my $currentversion=¤tversion($fname);
1827: if (&thisversion($fname)==$currentversion) {
1828: if ($fname=~/^(.+)\.\d+\.(\w+(?:\.meta)*)$/) {
1829: my $root=$1;
1830: my $extension=$2;
1831: symlink($root.'.'.$extension,
1832: $root.'.'.$currentversion.'.'.$extension);
1833: unless ($extension=~/\.meta$/) {
1834: symlink($root.'.'.$extension.'.meta',
1835: $root.'.'.$currentversion.'.'.$extension.'.meta');
1836: }
1837: }
1838: }
1839: }
1840: if (-e $fname) {
1841: if (-d $fname) {
1842: $result="directory\n";
1843: } else {
1844: if (-e "$fname.$hostid{$clientip}") {&unsub($fname,$clientip);}
1845: $now=time;
1846: my $found=&addline($fname,$hostid{$clientip},$clientip,
1847: "$hostid{$clientip}:$clientip:$now\n");
1848: if ($found) { $result="$fname\n"; }
1849: # if they were subscribed to only meta data, delete that
1850: # subscription, when you subscribe to a file you also get
1851: # the metadata
1852: unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
1853: $fname=~s/\/home\/httpd\/html\/res/raw/;
1854: $fname="http://$thisserver/".$fname;
1855: $result="$fname\n";
1856: }
1857: } else {
1858: $result="not_found\n";
1859: }
1860: } else {
1861: $result="rejected\n";
1862: }
1863: return $result;
1864: }
1865:
1866: sub make_passwd_file {
1867: my ($uname, $umode,$npass,$passfilename)=@_;
1868: my $result="ok\n";
1869: if ($umode eq 'krb4' or $umode eq 'krb5') {
1870: {
1871: my $pf = IO::File->new(">$passfilename");
1872: print $pf "$umode:$npass\n";
1873: }
1874: } elsif ($umode eq 'internal') {
1875: my $salt=time;
1876: $salt=substr($salt,6,2);
1877: my $ncpass=crypt($npass,$salt);
1878: {
1879: &Debug("Creating internal auth");
1880: my $pf = IO::File->new(">$passfilename");
1881: print $pf "internal:$ncpass\n";
1882: }
1883: } elsif ($umode eq 'localauth') {
1884: {
1885: my $pf = IO::File->new(">$passfilename");
1886: print $pf "localauth:$npass\n";
1887: }
1888: } elsif ($umode eq 'unix') {
1889: {
1890: my $execpath="$perlvar{'lonDaemons'}/"."lcuseradd";
1891: {
1892: &Debug("Executing external: ".$execpath);
1893: &Debug("user = ".$uname.", Password =". $npass);
1894: my $se = IO::File->new("|$execpath > /home/www/lcuseradd.log");
1895: print $se "$uname\n";
1896: print $se "$npass\n";
1897: print $se "$npass\n";
1898: }
1899: my $useraddok = $?;
1900: if($useraddok > 0) {
1901: &logthis("Failed lcuseradd: ".&lcuseraddstrerror($useraddok));
1902: }
1903: my $pf = IO::File->new(">$passfilename");
1904: print $pf "unix:\n";
1905: }
1906: } elsif ($umode eq 'none') {
1907: {
1908: my $pf = IO::File->new(">$passfilename");
1909: print $pf "none:\n";
1910: }
1911: } else {
1912: $result="auth_mode_error\n";
1913: }
1914: return $result;
1915: }
1916:
1917: # ----------------------------------- POD (plain old documentation, CPAN style)
1918:
1919: =head1 NAME
1920:
1921: lond - "LON Daemon" Server (port "LOND" 5663)
1922:
1923: =head1 SYNOPSIS
1924:
1925: Usage: B<lond>
1926:
1927: Should only be run as user=www. This is a command-line script which
1928: is invoked by B<loncron>. There is no expectation that a typical user
1929: will manually start B<lond> from the command-line. (In other words,
1930: DO NOT START B<lond> YOURSELF.)
1931:
1932: =head1 DESCRIPTION
1933:
1934: There are two characteristics associated with the running of B<lond>,
1935: PROCESS MANAGEMENT (starting, stopping, handling child processes)
1936: and SERVER-SIDE ACTIVITIES (password authentication, user creation,
1937: subscriptions, etc). These are described in two large
1938: sections below.
1939:
1940: B<PROCESS MANAGEMENT>
1941:
1942: Preforker - server who forks first. Runs as a daemon. HUPs.
1943: Uses IDEA encryption
1944:
1945: B<lond> forks off children processes that correspond to the other servers
1946: in the network. Management of these processes can be done at the
1947: parent process level or the child process level.
1948:
1949: B<logs/lond.log> is the location of log messages.
1950:
1951: The process management is now explained in terms of linux shell commands,
1952: subroutines internal to this code, and signal assignments:
1953:
1954: =over 4
1955:
1956: =item *
1957:
1958: PID is stored in B<logs/lond.pid>
1959:
1960: This is the process id number of the parent B<lond> process.
1961:
1962: =item *
1963:
1964: SIGTERM and SIGINT
1965:
1966: Parent signal assignment:
1967: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
1968:
1969: Child signal assignment:
1970: $SIG{INT} = 'DEFAULT'; (and SIGTERM is DEFAULT also)
1971: (The child dies and a SIGALRM is sent to parent, awaking parent from slumber
1972: to restart a new child.)
1973:
1974: Command-line invocations:
1975: B<kill> B<-s> SIGTERM I<PID>
1976: B<kill> B<-s> SIGINT I<PID>
1977:
1978: Subroutine B<HUNTSMAN>:
1979: This is only invoked for the B<lond> parent I<PID>.
1980: This kills all the children, and then the parent.
1981: The B<lonc.pid> file is cleared.
1982:
1983: =item *
1984:
1985: SIGHUP
1986:
1987: Current bug:
1988: This signal can only be processed the first time
1989: on the parent process. Subsequent SIGHUP signals
1990: have no effect.
1991:
1992: Parent signal assignment:
1993: $SIG{HUP} = \&HUPSMAN;
1994:
1995: Child signal assignment:
1996: none (nothing happens)
1997:
1998: Command-line invocations:
1999: B<kill> B<-s> SIGHUP I<PID>
2000:
2001: Subroutine B<HUPSMAN>:
2002: This is only invoked for the B<lond> parent I<PID>,
2003: This kills all the children, and then the parent.
2004: The B<lond.pid> file is cleared.
2005:
2006: =item *
2007:
2008: SIGUSR1
2009:
2010: Parent signal assignment:
2011: $SIG{USR1} = \&USRMAN;
2012:
2013: Child signal assignment:
2014: $SIG{USR1}= \&logstatus;
2015:
2016: Command-line invocations:
2017: B<kill> B<-s> SIGUSR1 I<PID>
2018:
2019: Subroutine B<USRMAN>:
2020: When invoked for the B<lond> parent I<PID>,
2021: SIGUSR1 is sent to all the children, and the status of
2022: each connection is logged.
2023:
2024: =item *
2025:
2026: SIGCHLD
2027:
2028: Parent signal assignment:
2029: $SIG{CHLD} = \&REAPER;
2030:
2031: Child signal assignment:
2032: none
2033:
2034: Command-line invocations:
2035: B<kill> B<-s> SIGCHLD I<PID>
2036:
2037: Subroutine B<REAPER>:
2038: This is only invoked for the B<lond> parent I<PID>.
2039: Information pertaining to the child is removed.
2040: The socket port is cleaned up.
2041:
2042: =back
2043:
2044: B<SERVER-SIDE ACTIVITIES>
2045:
2046: Server-side information can be accepted in an encrypted or non-encrypted
2047: method.
2048:
2049: =over 4
2050:
2051: =item ping
2052:
2053: Query a client in the hosts.tab table; "Are you there?"
2054:
2055: =item pong
2056:
2057: Respond to a ping query.
2058:
2059: =item ekey
2060:
2061: Read in encrypted key, make cipher. Respond with a buildkey.
2062:
2063: =item load
2064:
2065: Respond with CPU load based on a computation upon /proc/loadavg.
2066:
2067: =item currentauth
2068:
2069: Reply with current authentication information (only over an
2070: encrypted channel).
2071:
2072: =item auth
2073:
2074: Only over an encrypted channel, reply as to whether a user's
2075: authentication information can be validated.
2076:
2077: =item passwd
2078:
2079: Allow for a password to be set.
2080:
2081: =item makeuser
2082:
2083: Make a user.
2084:
2085: =item passwd
2086:
2087: Allow for authentication mechanism and password to be changed.
2088:
2089: =item home
2090:
2091: Respond to a question "are you the home for a given user?"
2092:
2093: =item update
2094:
2095: Update contents of a subscribed resource.
2096:
2097: =item unsubscribe
2098:
2099: The server is unsubscribing from a resource.
2100:
2101: =item subscribe
2102:
2103: The server is subscribing to a resource.
2104:
2105: =item log
2106:
2107: Place in B<logs/lond.log>
2108:
2109: =item put
2110:
2111: stores hash in namespace
2112:
2113: =item rolesput
2114:
2115: put a role into a user's environment
2116:
2117: =item get
2118:
2119: returns hash with keys from array
2120: reference filled in from namespace
2121:
2122: =item eget
2123:
2124: returns hash with keys from array
2125: reference filled in from namesp (encrypts the return communication)
2126:
2127: =item rolesget
2128:
2129: get a role from a user's environment
2130:
2131: =item del
2132:
2133: deletes keys out of array from namespace
2134:
2135: =item keys
2136:
2137: returns namespace keys
2138:
2139: =item dump
2140:
2141: dumps the complete (or key matching regexp) namespace into a hash
2142:
2143: =item store
2144:
2145: stores hash permanently
2146: for this url; hashref needs to be given and should be a \%hashname; the
2147: remaining args aren't required and if they aren't passed or are '' they will
2148: be derived from the ENV
2149:
2150: =item restore
2151:
2152: returns a hash for a given url
2153:
2154: =item querysend
2155:
2156: Tells client about the lonsql process that has been launched in response
2157: to a sent query.
2158:
2159: =item queryreply
2160:
2161: Accept information from lonsql and make appropriate storage in temporary
2162: file space.
2163:
2164: =item idput
2165:
2166: Defines usernames as corresponding to IDs. (These "IDs" are unique identifiers
2167: for each student, defined perhaps by the institutional Registrar.)
2168:
2169: =item idget
2170:
2171: Returns usernames corresponding to IDs. (These "IDs" are unique identifiers
2172: for each student, defined perhaps by the institutional Registrar.)
2173:
2174: =item tmpput
2175:
2176: Accept and store information in temporary space.
2177:
2178: =item tmpget
2179:
2180: Send along temporarily stored information.
2181:
2182: =item ls
2183:
2184: List part of a user's directory.
2185:
2186: =item Hanging up (exit or init)
2187:
2188: What to do when a client tells the server that they (the client)
2189: are leaving the network.
2190:
2191: =item unknown command
2192:
2193: If B<lond> is sent an unknown command (not in the list above),
2194: it replys to the client "unknown_cmd".
2195:
2196: =item UNKNOWN CLIENT
2197:
2198: If the anti-spoofing algorithm cannot verify the client,
2199: the client is rejected (with a "refused" message sent
2200: to the client, and the connection is closed.
2201:
2202: =back
2203:
2204: =head1 PREREQUISITES
2205:
2206: IO::Socket
2207: IO::File
2208: Apache::File
2209: Symbol
2210: POSIX
2211: Crypt::IDEA
2212: LWP::UserAgent()
2213: GDBM_File
2214: Authen::Krb4
2215: Authen::Krb5
2216:
2217: =head1 COREQUISITES
2218:
2219: =head1 OSNAMES
2220:
2221: linux
2222:
2223: =head1 SCRIPT CATEGORIES
2224:
2225: Server/Process
2226:
2227: =cut
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