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1.1 albertel 1: #!/usr/bin/perl
2: # The LearningOnline Network
3: # lond "LON Daemon" Server (port "LOND" 5663)
4: # 5/26/99,6/4,6/10,6/11,6/14,6/15,6/26,6/28,6/30,
5: # 7/8,7/9,7/10,7/12,7/17,7/19,9/21,10/7,10/8,10/9,10/11 Gerd Kortemeyer
6: # based on "Perl Cookbook" ISBN 1-56592-243-3
7: # preforker - server who forks first
8: # runs as a daemon
9: # HUPs
10: # uses IDEA encryption
11:
12: use IO::Socket;
13: use IO::File;
14: use Apache::File;
15: use Symbol;
16: use POSIX;
17: use Crypt::IDEA;
18: use LWP::UserAgent();
19:
20: # ------------------------------------ Read httpd access.conf and get variables
21:
22: open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
23:
24: while ($configline=<CONFIG>) {
25: if ($configline =~ /PerlSetVar/) {
26: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
27: $perlvar{$varname}=$varvalue;
28: }
29: }
30: close(CONFIG);
31:
32: $PREFORK=4; # number of children to maintain, at least four spare
33:
34: # ------------------------------------------------------------- Read hosts file
35:
36: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
37:
38: while ($configline=<CONFIG>) {
39: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
40: chomp($ip);
41: $hostid{$ip}=$id;
42: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
43: $PREFORK++;
44: }
45: close(CONFIG);
46:
47: # establish SERVER socket, bind and listen.
48: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
49: Type => SOCK_STREAM,
50: Proto => 'tcp',
51: Reuse => 1,
52: Listen => 10 )
53: or die "making socket: $@\n";
54:
55: # --------------------------------------------------------- Do global variables
56:
57: # global variables
58:
59: $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should
60: # process
61: %children = (); # keys are current child process IDs
62: $children = 0; # current number of children
63:
64: sub REAPER { # takes care of dead children
65: $SIG{CHLD} = \&REAPER;
66: my $pid = wait;
67: $children --;
68: &logthis("Child $pid died");
69: delete $children{$pid};
70: }
71:
72: sub HUNTSMAN { # signal handler for SIGINT
73: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
74: kill 'INT' => keys %children;
75: my $execdir=$perlvar{'lonDaemons'};
76: unlink("$execdir/logs/lond.pid");
77: &logthis("Shutting down");
78: exit; # clean up with dignity
79: }
80:
81: sub HUPSMAN { # signal handler for SIGHUP
82: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
83: kill 'INT' => keys %children;
84: close($server); # free up socket
85: &logthis("Restarting");
86: my $execdir=$perlvar{'lonDaemons'};
87: exec("$execdir/lond"); # here we go again
88: }
89:
90: # --------------------------------------------------------------------- Logging
91:
92: sub logthis {
93: my $message=shift;
94: my $execdir=$perlvar{'lonDaemons'};
95: my $fh=IO::File->new(">>$execdir/logs/lond.log");
96: my $now=time;
97: my $local=localtime($now);
98: print $fh "$local ($$): $message\n";
99: }
100:
101: # ----------------------------------------------------------- Send USR1 to lonc
102:
103: sub reconlonc {
104: my $peerfile=shift;
105: &logthis("Trying to reconnect for $peerfile");
106: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
107: if (my $fh=IO::File->new("$loncfile")) {
108: my $loncpid=<$fh>;
109: chomp($loncpid);
110: if (kill 0 => $loncpid) {
111: &logthis("lonc at pid $loncpid responding, sending USR1");
112: kill USR1 => $loncpid;
113: sleep 1;
114: if (-e "$peerfile") { return; }
115: &logthis("$peerfile still not there, give it another try");
116: sleep 5;
117: if (-e "$peerfile") { return; }
118: &logthis("$peerfile still not there, giving up");
119: } else {
120: &logthis("lonc at pid $loncpid not responding, giving up");
121: }
122: } else {
123: &logthis('lonc not running, giving up');
124: }
125: }
126:
127: # -------------------------------------------------- Non-critical communication
128: sub subreply {
129: my ($cmd,$server)=@_;
130: my $peerfile="$perlvar{'lonSockDir'}/$server";
131: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
132: Type => SOCK_STREAM,
133: Timeout => 10)
134: or return "con_lost";
135: print $sclient "$cmd\n";
136: my $answer=<$sclient>;
137: chomp($answer);
138: if (!$answer) { $answer="con_lost"; }
139: return $answer;
140: }
141:
142: sub reply {
143: my ($cmd,$server)=@_;
144: my $answer;
145: if ($server ne $perlvar{'lonHostID'}) {
146: $answer=subreply($cmd,$server);
147: if ($answer eq 'con_lost') {
148: $answer=subreply("ping",$server);
149: if ($answer ne $server) {
150: &reconlonc("$perlvar{'lonSockDir'}/$server");
151: }
152: $answer=subreply($cmd,$server);
153: }
154: } else {
155: $answer='self_reply';
156: }
157: return $answer;
158: }
159:
160: # -------------------------------------------- Return path to profile directory
161: sub propath {
162: my ($udom,$uname)=@_;
163: $udom=~s/\W//g;
164: $uname=~s/\W//g;
165: my $subdir=$uname;
166: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
167: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
168: return $proname;
169: }
170:
171: # --------------------------------------- Is this the home server of an author?
172: sub ishome {
173: my $author=shift;
174: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
175: my ($udom,$uname)=split(/\//,$author);
176: my $proname=propath($udom,$uname);
177: if (-e $proname) {
178: return 'owner';
179: } else {
180: return 'not_owner';
181: }
182: }
183:
184: # ======================================================= Continue main program
185: # ---------------------------------------------------- Fork once and dissociate
186:
187: $fpid=fork;
188: exit if $fpid;
189: die "Couldn't fork: $!" unless defined ($fpid);
190:
191: POSIX::setsid() or die "Can't start new session: $!";
192:
193: # ------------------------------------------------------- Write our PID on disk
194:
195: $execdir=$perlvar{'lonDaemons'};
196: open (PIDSAVE,">$execdir/logs/lond.pid");
197: print PIDSAVE "$$\n";
198: close(PIDSAVE);
199: &logthis("Starting");
200:
201: # ------------------------------------------------------- Now we are on our own
202:
203: # Fork off our children.
204: for (1 .. $PREFORK) {
205: make_new_child();
206: }
207:
208: # ----------------------------------------------------- Install signal handlers
209:
210: $SIG{CHLD} = \&REAPER;
211: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
212: $SIG{HUP} = \&HUPSMAN;
213:
214: # And maintain the population.
215: while (1) {
216: sleep; # wait for a signal (i.e., child's death)
217: for ($i = $children; $i < $PREFORK; $i++) {
218: make_new_child(); # top up the child pool
219: }
220: }
221:
222: sub make_new_child {
223: my $pid;
224: my $cipher;
225: my $sigset;
226: &logthis("Attempting to start child");
227: # block signal for fork
228: $sigset = POSIX::SigSet->new(SIGINT);
229: sigprocmask(SIG_BLOCK, $sigset)
230: or die "Can't block SIGINT for fork: $!\n";
231:
232: die "fork: $!" unless defined ($pid = fork);
233:
234: if ($pid) {
235: # Parent records the child's birth and returns.
236: sigprocmask(SIG_UNBLOCK, $sigset)
237: or die "Can't unblock SIGINT for fork: $!\n";
238: $children{$pid} = 1;
239: $children++;
240: return;
241: } else {
242: # Child can *not* return from this subroutine.
243: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
244:
245: # unblock signals
246: sigprocmask(SIG_UNBLOCK, $sigset)
247: or die "Can't unblock SIGINT for fork: $!\n";
248:
249: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
250: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
251: $client = $server->accept() or last;
252:
253: # =============================================================================
254: # do something with the connection
255: # -----------------------------------------------------------------------------
256: # see if we know client
257: my $caller=getpeername($client);
258: my ($port,$iaddr)=unpack_sockaddr_in($caller);
259: my $clientip=inet_ntoa($iaddr);
260: my $clientrec=($hostid{$clientip} ne undef);
261: &logthis("Connect from $clientip ($hostid{$clientip})");
262: if ($clientrec) {
263: # ---------------- New known client connecting, could mean machine online again
264: &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
265: # ------------------------------------------------------------ Process requests
266: while (my $userinput=<$client>) {
267: chomp($userinput);
268: my $wasenc=0;
269: # ------------------------------------------------------------ See if encrypted
270: if ($userinput =~ /^enc/) {
271: if ($cipher) {
272: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
273: $userinput='';
274: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
275: $userinput.=
276: $cipher->decrypt(
277: pack("H16",substr($encinput,$encidx,16))
278: );
279: }
280: $userinput=substr($userinput,0,$cmdlength);
281: $wasenc=1;
282: }
283: }
284: # ------------------------------------------------------------- Normal commands
285: # ------------------------------------------------------------------------ ping
286: if ($userinput =~ /^ping/) {
287: print $client "$perlvar{'lonHostID'}\n";
288: # ------------------------------------------------------------------------ pong
289: } elsif ($userinput =~ /^pong/) {
290: $reply=reply("ping",$hostid{$clientip});
291: print $client "$perlvar{'lonHostID'}:$reply\n";
292: # ------------------------------------------------------------------------ ekey
293: } elsif ($userinput =~ /^ekey/) {
294: my $buildkey=time.$$.int(rand 100000);
295: $buildkey=~tr/1-6/A-F/;
296: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
297: my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
298: $key=~tr/a-z/A-Z/;
299: $key=~tr/G-P/0-9/;
300: $key=~tr/Q-Z/0-9/;
301: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
302: $key=substr($key,0,32);
303: my $cipherkey=pack("H32",$key);
304: $cipher=new IDEA $cipherkey;
305: print $client "$buildkey\n";
306: # ------------------------------------------------------------------------ load
307: } elsif ($userinput =~ /^load/) {
308: my $loadavg;
309: {
310: my $loadfile=IO::File->new('/proc/loadavg');
311: $loadavg=<$loadfile>;
312: }
313: $loadavg =~ s/\s.*//g;
314: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
315: print $client "$loadpercent\n";
316: # ------------------------------------------------------------------------ auth
317: } elsif ($userinput =~ /^auth/) {
318: if ($wasenc==1) {
319: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
320: chomp($upass);
321: my $proname=propath($udom,$uname);
322: my $passfilename="$proname/passwd";
323: if (-e $passfilename) {
324: my $pf = IO::File->new($passfilename);
325: my $realpasswd=<$pf>;
326: chomp($realpasswd);
327: if ($realpasswd eq $upass ) {
328: print $client "authorized\n";
329: } else {
330: print $client "non_authorized\n";
331: }
332: } else {
333: print $client "unknown_user\n";
334: }
335: } else {
336: print $client "refused\n";
337: }
338: # ---------------------------------------------------------------------- passwd
339: } elsif ($userinput =~ /^passwd/) {
340: if ($wasenc==1) {
341: my
342: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
343: chomp($npass);
344: my $proname=propath($udom,$uname);
345: my $passfilename="$proname/passwd";
346: if (-e $passfilename) {
347: my $realpasswd;
348: { my $pf = IO::File->new($passfilename);
349: $realpasswd=<$pf>; }
350: chomp($realpasswd);
351: if ($realpasswd eq $upass ) {
352: { my $pf = IO::File->new(">$passfilename");
353: print $pf "$npass\n";; }
354: print $client "ok\n";
355: } else {
356: print $client "non_authorized\n";
357: }
358: } else {
359: print $client "unknown_user\n";
360: }
361: } else {
362: print $client "refused\n";
363: }
364: # ------------------------------------------------------------------------ home
365: } elsif ($userinput =~ /^home/) {
366: my ($cmd,$udom,$uname)=split(/:/,$userinput);
367: chomp($uname);
368: my $proname=propath($udom,$uname);
369: if (-e $proname) {
370: print $client "found\n";
371: } else {
372: print $client "not_found\n";
373: }
374: # ---------------------------------------------------------------------- update
375: } elsif ($userinput =~ /^update/) {
376: my ($cmd,$fname)=split(/:/,$userinput);
377: my $ownership=ishome($fname);
378: if ($ownership eq 'not_owner') {
379: if (-e $fname) {
380: my ($dev,$ino,$mode,$nlink,
381: $uid,$gid,$rdev,$size,
382: $atime,$mtime,$ctime,
383: $blksize,$blocks)=stat($fname);
384: $now=time;
385: $since=$now-$atime;
386: if ($since>$perlvar{'lonExpire'}) {
387: $reply=
388: reply("unsub:$fname","$hostid{$clientip}");
389: unlink("$fname");
390: } else {
391: my $transname="$fname.in.transfer";
392: my $remoteurl=
393: reply("sub:$fname","$hostid{$clientip}");
394: my $response;
395: {
396: my $ua=new LWP::UserAgent;
397: my $request=new HTTP::Request('GET',"$remoteurl");
398: $response=$ua->request($request,$transname);
399: }
400: if ($response->is_error()) {
401: unline($transname);
402: my $message=$response->status_line;
403: &logthis(
404: "LWP GET: $message for $fname ($remoteurl)");
405: } else {
406: rename($transname,$fname);
407: }
408: }
409: print $client "ok\n";
410: } else {
411: print $client "not_found\n";
412: }
413: } else {
414: print $client "rejected\n";
415: }
416: # ----------------------------------------------------------------- unsubscribe
417: } elsif ($userinput =~ /^unsub/) {
418: my ($cmd,$fname)=split(/:/,$userinput);
419: if (-e $fname) {
420: if (unlink("$fname.$hostid{$clientip}")) {
421: print $client "ok\n";
422: } else {
423: print $client "not_subscribed\n";
424: }
425: } else {
426: print $client "not_found\n";
427: }
428: # ------------------------------------------------------------------- subscribe
429: } elsif ($userinput =~ /^sub/) {
430: my ($cmd,$fname)=split(/:/,$userinput);
431: my $ownership=ishome($fname);
432: if ($ownership eq 'owner') {
433: if (-e $fname) {
434: $now=time;
435: {
436: my $sh=IO::File->new(">$fname.$hostid{$clientip}");
437: print $sh "$clientip:$now\n";
438: }
439: $fname=~s/\/home\/httpd\/html\/res/raw/;
440: $fname="http://$thisserver/".$fname;
441: print $client "$fname\n";
442: } else {
443: print $client "not_found\n";
444: }
445: } else {
446: print $client "rejected\n";
447: }
448: # ------------------------------------------------------------------------- put
449: } elsif ($userinput =~ /^put/) {
450: my ($cmd,$udom,$uname,$namespace,$what)
451: =split(/:/,$userinput);
452: $namespace=~s/\W//g;
453: chomp($what);
454: my $proname=propath($udom,$uname);
455: my $now=time;
456: {
457: my $hfh;
458: if (
459: $hfh=IO::File->new(">>$proname/$namespace.hist")
460: ) { print $hfh "P:$now:$what\n"; }
461: }
462: my @pairs=split(/\&/,$what);
463: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
464: foreach $pair (@pairs) {
465: ($key,$value)=split(/=/,$pair);
466: $hash{$key}=$value;
467: }
468: if (dbmclose(%hash)) {
469: print $client "ok\n";
470: } else {
471: print $client "error:$!\n";
472: }
473: } else {
474: print $client "error:$!\n";
475: }
476: # ------------------------------------------------------------------------- get
477: } elsif ($userinput =~ /^get/) {
478: my ($cmd,$udom,$uname,$namespace,$what)
479: =split(/:/,$userinput);
480: $namespace=~s/\W//g;
481: chomp($what);
482: my @queries=split(/\&/,$what);
483: my $proname=propath($udom,$uname);
484: my $qresult='';
485: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
486: for ($i=0;$i<=$#queries;$i++) {
487: $qresult.="$hash{$queries[$i]}&";
488: }
489: if (dbmclose(%hash)) {
490: $qresult=~s/\&$//;
491: print $client "$qresult\n";
492: } else {
493: print $client "error:$!\n";
494: }
495: } else {
496: print $client "error:$!\n";
497: }
498: # ------------------------------------------------------------------------ eget
499: } elsif ($userinput =~ /^eget/) {
500: my ($cmd,$udom,$uname,$namespace,$what)
501: =split(/:/,$userinput);
502: $namespace=~s/\W//g;
503: chomp($what);
504: my @queries=split(/\&/,$what);
505: my $proname=propath($udom,$uname);
506: my $qresult='';
507: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
508: for ($i=0;$i<=$#queries;$i++) {
509: $qresult.="$hash{$queries[$i]}&";
510: }
511: if (dbmclose(%hash)) {
512: $qresult=~s/\&$//;
513: if ($cipher) {
514: my $cmdlength=length($qresult);
515: $qresult.=" ";
516: my $encqresult='';
517: for
518: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
519: $encqresult.=
520: unpack("H16",
521: $cipher->encrypt(substr($qresult,$encidx,8)));
522: }
523: print $client "enc:$cmdlength:$encqresult\n";
524: } else {
525: print $client "error:no_key\n";
526: }
527: } else {
528: print $client "error:$!\n";
529: }
530: } else {
531: print $client "error:$!\n";
532: }
533: # ------------------------------------------------------------------------- del
534: } elsif ($userinput =~ /^del/) {
535: my ($cmd,$udom,$uname,$namespace,$what)
536: =split(/:/,$userinput);
537: $namespace=~s/\W//g;
538: chomp($what);
539: my $proname=propath($udom,$uname);
540: my $now=time;
541: {
542: my $hfh;
543: if (
544: $hfh=IO::File->new(">>$proname/$namespace.hist")
545: ) { print $hfh "D:$now:$what\n"; }
546: }
547: my @keys=split(/\&/,$what);
548: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
549: foreach $key (@keys) {
550: delete($hash{$key});
551: }
552: if (dbmclose(%hash)) {
553: print $client "ok\n";
554: } else {
555: print $client "error:$!\n";
556: }
557: } else {
558: print $client "error:$!\n";
559: }
560: # ------------------------------------------------------------------------ keys
561: } elsif ($userinput =~ /^keys/) {
562: my ($cmd,$udom,$uname,$namespace)
563: =split(/:/,$userinput);
564: $namespace=~s/\W//g;
565: chomp($namespace);
566: my $proname=propath($udom,$uname);
567: my $qresult='';
568: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
569: foreach $key (keys %hash) {
570: $qresult.="$key&";
571: }
572: if (dbmclose(%hash)) {
573: $qresult=~s/\&$//;
574: print $client "$qresult\n";
575: } else {
576: print $client "error:$!\n";
577: }
578: } else {
579: print $client "error:$!\n";
580: }
581: # ------------------------------------------------------------------------ dump
582: } elsif ($userinput =~ /^dump/) {
583: my ($cmd,$udom,$uname,$namespace)
584: =split(/:/,$userinput);
585: $namespace=~s/\W//g;
586: chomp($namespace);
587: my $proname=propath($udom,$uname);
588: my $qresult='';
589: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
590: foreach $key (keys %hash) {
591: $qresult.="$key=$hash{$key}&";
592: }
593: if (dbmclose(%hash)) {
594: $qresult=~s/\&$//;
595: print $client "$qresult\n";
596: } else {
597: print $client "error:$!\n";
598: }
599: } else {
600: print $client "error:$!\n";
601: }
602: # ----------------------------------------------------------------------- idput
603: } elsif ($userinput =~ /^idput/) {
604: my ($cmd,$udom,$what)=split(/:/,$userinput);
605: chomp($what);
606: $udom=~s/\W//g;
607: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
608: my $now=time;
609: {
610: my $hfh;
611: if (
612: $hfh=IO::File->new(">>$proname.hist")
613: ) { print $hfh "P:$now:$what\n"; }
614: }
615: my @pairs=split(/\&/,$what);
616: if (dbmopen(%hash,"$proname.db",0644)) {
617: foreach $pair (@pairs) {
618: ($key,$value)=split(/=/,$pair);
619: $hash{$key}=$value;
620: }
621: if (dbmclose(%hash)) {
622: print $client "ok\n";
623: } else {
624: print $client "error:$!\n";
625: }
626: } else {
627: print $client "error:$!\n";
628: }
629: # ----------------------------------------------------------------------- idget
630: } elsif ($userinput =~ /^idget/) {
631: my ($cmd,$udom,$what)=split(/:/,$userinput);
632: chomp($what);
633: $udom=~s/\W//g;
634: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
635: my @queries=split(/\&/,$what);
636: my $qresult='';
637: if (dbmopen(%hash,"$proname.db",0644)) {
638: for ($i=0;$i<=$#queries;$i++) {
639: $qresult.="$hash{$queries[$i]}&";
640: }
641: if (dbmclose(%hash)) {
642: $qresult=~s/\&$//;
643: print $client "$qresult\n";
644: } else {
645: print $client "error:$!\n";
646: }
647: } else {
648: print $client "error:$!\n";
649: }
650: # ------------------------------------------------------------- unknown command
651: } else {
652: # unknown command
653: print $client "unknown_cmd\n";
654: }
655: # ------------------------------------------------------ client unknown, refuse
656: }
657: } else {
658: print $client "refused\n";
659: &logthis("Unknown client $clientip, closing connection");
660: }
661: &logthis("Disconnect from $clientip ($hostid{$clientip})");
662: # =============================================================================
663: }
664:
665: # tidy up gracefully and finish
666:
667: # this exit is VERY important, otherwise the child will become
668: # a producer of more and more children, forking yourself into
669: # process death.
670: exit;
671: }
672: }
673:
674:
675:
676:
677: