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,
6: # 10/7,10/8,10/9,10/11,10/13,10/15 Gerd Kortemeyer
7: # based on "Perl Cookbook" ISBN 1-56592-243-3
8: # preforker - server who forks first
9: # runs as a daemon
10: # HUPs
11: # uses IDEA encryption
12:
13: use IO::Socket;
14: use IO::File;
15: use Apache::File;
16: use Symbol;
17: use POSIX;
18: use Crypt::IDEA;
19: use LWP::UserAgent();
20:
21: # ------------------------------------ Read httpd access.conf and get variables
22:
23: open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
24:
25: while ($configline=<CONFIG>) {
26: if ($configline =~ /PerlSetVar/) {
27: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
28: $perlvar{$varname}=$varvalue;
29: }
30: }
31: close(CONFIG);
32:
33: $PREFORK=4; # number of children to maintain, at least four spare
34:
35: # ------------------------------------------------------------- Read hosts file
36:
37: open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
38:
39: while ($configline=<CONFIG>) {
40: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
41: chomp($ip);
42: $hostid{$ip}=$id;
43: if ($id eq $perlvar{'lonHostID'}) { $thisserver=$name; }
44: $PREFORK++;
45: }
46: close(CONFIG);
47:
48: # establish SERVER socket, bind and listen.
49: $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
50: Type => SOCK_STREAM,
51: Proto => 'tcp',
52: Reuse => 1,
53: Listen => 10 )
54: or die "making socket: $@\n";
55:
56: # --------------------------------------------------------- Do global variables
57:
58: # global variables
59:
60: $MAX_CLIENTS_PER_CHILD = 5; # number of clients each child should
61: # process
62: %children = (); # keys are current child process IDs
63: $children = 0; # current number of children
64:
65: sub REAPER { # takes care of dead children
66: $SIG{CHLD} = \&REAPER;
67: my $pid = wait;
68: $children --;
69: &logthis("Child $pid died");
70: delete $children{$pid};
71: }
72:
73: sub HUNTSMAN { # signal handler for SIGINT
74: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
75: kill 'INT' => keys %children;
76: my $execdir=$perlvar{'lonDaemons'};
77: unlink("$execdir/logs/lond.pid");
78: &logthis("Shutting down");
79: exit; # clean up with dignity
80: }
81:
82: sub HUPSMAN { # signal handler for SIGHUP
83: local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children
84: kill 'INT' => keys %children;
85: close($server); # free up socket
86: &logthis("Restarting");
87: my $execdir=$perlvar{'lonDaemons'};
88: exec("$execdir/lond"); # here we go again
89: }
90:
91: # --------------------------------------------------------------------- Logging
92:
93: sub logthis {
94: my $message=shift;
95: my $execdir=$perlvar{'lonDaemons'};
96: my $fh=IO::File->new(">>$execdir/logs/lond.log");
97: my $now=time;
98: my $local=localtime($now);
99: print $fh "$local ($$): $message\n";
100: }
101:
102: # ----------------------------------------------------------- Send USR1 to lonc
103:
104: sub reconlonc {
105: my $peerfile=shift;
106: &logthis("Trying to reconnect for $peerfile");
107: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
108: if (my $fh=IO::File->new("$loncfile")) {
109: my $loncpid=<$fh>;
110: chomp($loncpid);
111: if (kill 0 => $loncpid) {
112: &logthis("lonc at pid $loncpid responding, sending USR1");
113: kill USR1 => $loncpid;
114: sleep 1;
115: if (-e "$peerfile") { return; }
116: &logthis("$peerfile still not there, give it another try");
117: sleep 5;
118: if (-e "$peerfile") { return; }
119: &logthis("$peerfile still not there, giving up");
120: } else {
121: &logthis("lonc at pid $loncpid not responding, giving up");
122: }
123: } else {
124: &logthis('lonc not running, giving up');
125: }
126: }
127:
128: # -------------------------------------------------- Non-critical communication
129: sub subreply {
130: my ($cmd,$server)=@_;
131: my $peerfile="$perlvar{'lonSockDir'}/$server";
132: my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile",
133: Type => SOCK_STREAM,
134: Timeout => 10)
135: or return "con_lost";
136: print $sclient "$cmd\n";
137: my $answer=<$sclient>;
138: chomp($answer);
139: if (!$answer) { $answer="con_lost"; }
140: return $answer;
141: }
142:
143: sub reply {
144: my ($cmd,$server)=@_;
145: my $answer;
146: if ($server ne $perlvar{'lonHostID'}) {
147: $answer=subreply($cmd,$server);
148: if ($answer eq 'con_lost') {
149: $answer=subreply("ping",$server);
150: if ($answer ne $server) {
151: &reconlonc("$perlvar{'lonSockDir'}/$server");
152: }
153: $answer=subreply($cmd,$server);
154: }
155: } else {
156: $answer='self_reply';
157: }
158: return $answer;
159: }
160:
161: # -------------------------------------------- Return path to profile directory
162: sub propath {
163: my ($udom,$uname)=@_;
164: $udom=~s/\W//g;
165: $uname=~s/\W//g;
166: my $subdir=$uname;
167: $subdir =~ s/(.)(.)(.).*/$1\/$2\/$3/;
168: my $proname="$perlvar{'lonUsersDir'}/$udom/$subdir/$uname";
169: return $proname;
170: }
171:
172: # --------------------------------------- Is this the home server of an author?
173: sub ishome {
174: my $author=shift;
175: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
176: my ($udom,$uname)=split(/\//,$author);
177: my $proname=propath($udom,$uname);
178: if (-e $proname) {
179: return 'owner';
180: } else {
181: return 'not_owner';
182: }
183: }
184:
185: # ======================================================= Continue main program
186: # ---------------------------------------------------- Fork once and dissociate
187:
188: $fpid=fork;
189: exit if $fpid;
190: die "Couldn't fork: $!" unless defined ($fpid);
191:
192: POSIX::setsid() or die "Can't start new session: $!";
193:
194: # ------------------------------------------------------- Write our PID on disk
195:
196: $execdir=$perlvar{'lonDaemons'};
197: open (PIDSAVE,">$execdir/logs/lond.pid");
198: print PIDSAVE "$$\n";
199: close(PIDSAVE);
200: &logthis("Starting");
201:
202: # ------------------------------------------------------- Now we are on our own
203:
204: # Fork off our children.
205: for (1 .. $PREFORK) {
206: make_new_child();
207: }
208:
209: # ----------------------------------------------------- Install signal handlers
210:
211: $SIG{CHLD} = \&REAPER;
212: $SIG{INT} = $SIG{TERM} = \&HUNTSMAN;
213: $SIG{HUP} = \&HUPSMAN;
214:
215: # And maintain the population.
216: while (1) {
217: sleep; # wait for a signal (i.e., child's death)
218: for ($i = $children; $i < $PREFORK; $i++) {
219: make_new_child(); # top up the child pool
220: }
221: }
222:
223: sub make_new_child {
224: my $pid;
225: my $cipher;
226: my $sigset;
227: &logthis("Attempting to start child");
228: # block signal for fork
229: $sigset = POSIX::SigSet->new(SIGINT);
230: sigprocmask(SIG_BLOCK, $sigset)
231: or die "Can't block SIGINT for fork: $!\n";
232:
233: die "fork: $!" unless defined ($pid = fork);
234:
235: if ($pid) {
236: # Parent records the child's birth and returns.
237: sigprocmask(SIG_UNBLOCK, $sigset)
238: or die "Can't unblock SIGINT for fork: $!\n";
239: $children{$pid} = 1;
240: $children++;
241: return;
242: } else {
243: # Child can *not* return from this subroutine.
244: $SIG{INT} = 'DEFAULT'; # make SIGINT kill us as it did before
245:
246: # unblock signals
247: sigprocmask(SIG_UNBLOCK, $sigset)
248: or die "Can't unblock SIGINT for fork: $!\n";
249:
250: # handle connections until we've reached $MAX_CLIENTS_PER_CHILD
251: for ($i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
252: $client = $server->accept() or last;
253:
254: # =============================================================================
255: # do something with the connection
256: # -----------------------------------------------------------------------------
257: # see if we know client and check for spoof IP by challenge
258: my $caller=getpeername($client);
259: my ($port,$iaddr)=unpack_sockaddr_in($caller);
260: my $clientip=inet_ntoa($iaddr);
261: my $clientrec=($hostid{$clientip} ne undef);
262: &logthis("Connect from $clientip ($hostid{$clientip})");
263: my $clientok;
264: if ($clientrec) {
265: my $remotereq=<$client>;
266: $remotereq=~s/\W//g;
267: if ($remotereq eq 'init') {
268: my $challenge="$$".time;
269: print $client "$challenge\n";
270: $remotereq=<$client>;
271: $remotereq=~s/\W//g;
272: if ($challenge eq $remotereq) {
273: $clientok=1;
274: print $client "ok\n";
275: } else {
276: &logthis("$clientip did not reply challenge");
277: }
278: } else {
279: &logthis("$clientip failed to initialize: >$remotereq<");
280: }
281: } else {
282: &logthis("Unknown client $clientip");
283: }
284: if ($clientok) {
285: # ---------------- New known client connecting, could mean machine online again
286: &reconlonc("$perlvar{'lonSockDir'}/$hostid{$clientip}");
287: # ------------------------------------------------------------ Process requests
288: while (my $userinput=<$client>) {
289: chomp($userinput);
290: my $wasenc=0;
291: # ------------------------------------------------------------ See if encrypted
292: if ($userinput =~ /^enc/) {
293: if ($cipher) {
294: my ($cmd,$cmdlength,$encinput)=split(/:/,$userinput);
295: $userinput='';
296: for (my $encidx=0;$encidx<length($encinput);$encidx+=16) {
297: $userinput.=
298: $cipher->decrypt(
299: pack("H16",substr($encinput,$encidx,16))
300: );
301: }
302: $userinput=substr($userinput,0,$cmdlength);
303: $wasenc=1;
304: }
305: }
306: # ------------------------------------------------------------- Normal commands
307: # ------------------------------------------------------------------------ ping
308: if ($userinput =~ /^ping/) {
309: print $client "$perlvar{'lonHostID'}\n";
310: # ------------------------------------------------------------------------ pong
311: } elsif ($userinput =~ /^pong/) {
312: $reply=reply("ping",$hostid{$clientip});
313: print $client "$perlvar{'lonHostID'}:$reply\n";
314: # ------------------------------------------------------------------------ ekey
315: } elsif ($userinput =~ /^ekey/) {
316: my $buildkey=time.$$.int(rand 100000);
317: $buildkey=~tr/1-6/A-F/;
318: $buildkey=int(rand 100000).$buildkey.int(rand 100000);
319: my $key=$perlvar{'lonHostID'}.$hostid{$clientip};
320: $key=~tr/a-z/A-Z/;
321: $key=~tr/G-P/0-9/;
322: $key=~tr/Q-Z/0-9/;
323: $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
324: $key=substr($key,0,32);
325: my $cipherkey=pack("H32",$key);
326: $cipher=new IDEA $cipherkey;
327: print $client "$buildkey\n";
328: # ------------------------------------------------------------------------ load
329: } elsif ($userinput =~ /^load/) {
330: my $loadavg;
331: {
332: my $loadfile=IO::File->new('/proc/loadavg');
333: $loadavg=<$loadfile>;
334: }
335: $loadavg =~ s/\s.*//g;
336: my $loadpercent=100*$loadavg/$perlvar{'lonLoadLim'};
337: print $client "$loadpercent\n";
338: # ------------------------------------------------------------------------ auth
339: } elsif ($userinput =~ /^auth/) {
340: if ($wasenc==1) {
341: my ($cmd,$udom,$uname,$upass)=split(/:/,$userinput);
342: chomp($upass);
343: my $proname=propath($udom,$uname);
344: my $passfilename="$proname/passwd";
345: if (-e $passfilename) {
346: my $pf = IO::File->new($passfilename);
347: my $realpasswd=<$pf>;
348: chomp($realpasswd);
349: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
350: my $pwdcorrect=0;
351: if ($howpwd eq 'internal') {
352: $pwdcorrect=
353: (crypt($upass,$contentpwd) eq $contentpwd);
354: } elsif ($howpwd eq 'unix') {
355: $contentpwd=(getpwnam($uname))[1];
356: $pwdcorrect=
357: (crypt($upass,$contentpwd) eq $contentpwd);
358: }
359: if ($pwdcorrect) {
360: print $client "authorized\n";
361: } else {
362: print $client "non_authorized\n";
363: }
364: } else {
365: print $client "unknown_user\n";
366: }
367: } else {
368: print $client "refused\n";
369: }
370: # ---------------------------------------------------------------------- passwd
371: } elsif ($userinput =~ /^passwd/) {
372: if ($wasenc==1) {
373: my
374: ($cmd,$udom,$uname,$upass,$npass)=split(/:/,$userinput);
375: chomp($npass);
376: my $proname=propath($udom,$uname);
377: my $passfilename="$proname/passwd";
378: if (-e $passfilename) {
379: my $realpasswd;
380: { my $pf = IO::File->new($passfilename);
381: $realpasswd=<$pf>; }
382: chomp($realpasswd);
383: my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
384: if ($howpwd eq 'internal') {
385: if (crypt($upass,$contentpwd) eq $contentpwd) {
386: my $salt=time;
387: $salt=substr($salt,6,2);
388: my $ncpass=crypt($npass,$salt);
389: { my $pf = IO::File->new(">$passfilename");
390: print $pf "internal:$ncpass\n";; }
391: print $client "ok\n";
392: } else {
393: print $client "non_authorized\n";
394: }
395: } else {
396: print $client "auth_mode_error\n";
397: }
398: } else {
399: print $client "unknown_user\n";
400: }
401: } else {
402: print $client "refused\n";
403: }
404: # ------------------------------------------------------------------------ home
405: } elsif ($userinput =~ /^home/) {
406: my ($cmd,$udom,$uname)=split(/:/,$userinput);
407: chomp($uname);
408: my $proname=propath($udom,$uname);
409: if (-e $proname) {
410: print $client "found\n";
411: } else {
412: print $client "not_found\n";
413: }
414: # ---------------------------------------------------------------------- update
415: } elsif ($userinput =~ /^update/) {
416: my ($cmd,$fname)=split(/:/,$userinput);
417: my $ownership=ishome($fname);
418: if ($ownership eq 'not_owner') {
419: if (-e $fname) {
420: my ($dev,$ino,$mode,$nlink,
421: $uid,$gid,$rdev,$size,
422: $atime,$mtime,$ctime,
423: $blksize,$blocks)=stat($fname);
424: $now=time;
425: $since=$now-$atime;
426: if ($since>$perlvar{'lonExpire'}) {
427: $reply=
428: reply("unsub:$fname","$hostid{$clientip}");
429: unlink("$fname");
430: } else {
431: my $transname="$fname.in.transfer";
432: my $remoteurl=
433: reply("sub:$fname","$hostid{$clientip}");
434: my $response;
435: {
436: my $ua=new LWP::UserAgent;
437: my $request=new HTTP::Request('GET',"$remoteurl");
438: $response=$ua->request($request,$transname);
439: }
440: if ($response->is_error()) {
441: unline($transname);
442: my $message=$response->status_line;
443: &logthis(
444: "LWP GET: $message for $fname ($remoteurl)");
445: } else {
446: rename($transname,$fname);
447: }
448: }
449: print $client "ok\n";
450: } else {
451: print $client "not_found\n";
452: }
453: } else {
454: print $client "rejected\n";
455: }
456: # ----------------------------------------------------------------- unsubscribe
457: } elsif ($userinput =~ /^unsub/) {
458: my ($cmd,$fname)=split(/:/,$userinput);
459: if (-e $fname) {
460: if (unlink("$fname.$hostid{$clientip}")) {
461: print $client "ok\n";
462: } else {
463: print $client "not_subscribed\n";
464: }
465: } else {
466: print $client "not_found\n";
467: }
468: # ------------------------------------------------------------------- subscribe
469: } elsif ($userinput =~ /^sub/) {
470: my ($cmd,$fname)=split(/:/,$userinput);
471: my $ownership=ishome($fname);
472: if ($ownership eq 'owner') {
473: if (-e $fname) {
474: $now=time;
475: {
476: my $sh=IO::File->new(">$fname.$hostid{$clientip}");
477: print $sh "$clientip:$now\n";
478: }
479: $fname=~s/\/home\/httpd\/html\/res/raw/;
480: $fname="http://$thisserver/".$fname;
481: print $client "$fname\n";
482: } else {
483: print $client "not_found\n";
484: }
485: } else {
486: print $client "rejected\n";
487: }
488: # ------------------------------------------------------------------------- put
489: } elsif ($userinput =~ /^put/) {
490: my ($cmd,$udom,$uname,$namespace,$what)
491: =split(/:/,$userinput);
492: $namespace=~s/\W//g;
493: chomp($what);
494: my $proname=propath($udom,$uname);
495: my $now=time;
496: {
497: my $hfh;
498: if (
499: $hfh=IO::File->new(">>$proname/$namespace.hist")
500: ) { print $hfh "P:$now:$what\n"; }
501: }
502: my @pairs=split(/\&/,$what);
503: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
504: foreach $pair (@pairs) {
505: ($key,$value)=split(/=/,$pair);
506: $hash{$key}=$value;
507: }
508: if (dbmclose(%hash)) {
509: print $client "ok\n";
510: } else {
511: print $client "error:$!\n";
512: }
513: } else {
514: print $client "error:$!\n";
515: }
516: # ------------------------------------------------------------------------- get
517: } elsif ($userinput =~ /^get/) {
518: my ($cmd,$udom,$uname,$namespace,$what)
519: =split(/:/,$userinput);
520: $namespace=~s/\W//g;
521: chomp($what);
522: my @queries=split(/\&/,$what);
523: my $proname=propath($udom,$uname);
524: my $qresult='';
525: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
526: for ($i=0;$i<=$#queries;$i++) {
527: $qresult.="$hash{$queries[$i]}&";
528: }
529: if (dbmclose(%hash)) {
530: $qresult=~s/\&$//;
531: print $client "$qresult\n";
532: } else {
533: print $client "error:$!\n";
534: }
535: } else {
536: print $client "error:$!\n";
537: }
538: # ------------------------------------------------------------------------ eget
539: } elsif ($userinput =~ /^eget/) {
540: my ($cmd,$udom,$uname,$namespace,$what)
541: =split(/:/,$userinput);
542: $namespace=~s/\W//g;
543: chomp($what);
544: my @queries=split(/\&/,$what);
545: my $proname=propath($udom,$uname);
546: my $qresult='';
547: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
548: for ($i=0;$i<=$#queries;$i++) {
549: $qresult.="$hash{$queries[$i]}&";
550: }
551: if (dbmclose(%hash)) {
552: $qresult=~s/\&$//;
553: if ($cipher) {
554: my $cmdlength=length($qresult);
555: $qresult.=" ";
556: my $encqresult='';
557: for
558: (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) {
559: $encqresult.=
560: unpack("H16",
561: $cipher->encrypt(substr($qresult,$encidx,8)));
562: }
563: print $client "enc:$cmdlength:$encqresult\n";
564: } else {
565: print $client "error:no_key\n";
566: }
567: } else {
568: print $client "error:$!\n";
569: }
570: } else {
571: print $client "error:$!\n";
572: }
573: # ------------------------------------------------------------------------- del
574: } elsif ($userinput =~ /^del/) {
575: my ($cmd,$udom,$uname,$namespace,$what)
576: =split(/:/,$userinput);
577: $namespace=~s/\W//g;
578: chomp($what);
579: my $proname=propath($udom,$uname);
580: my $now=time;
581: {
582: my $hfh;
583: if (
584: $hfh=IO::File->new(">>$proname/$namespace.hist")
585: ) { print $hfh "D:$now:$what\n"; }
586: }
587: my @keys=split(/\&/,$what);
588: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
589: foreach $key (@keys) {
590: delete($hash{$key});
591: }
592: if (dbmclose(%hash)) {
593: print $client "ok\n";
594: } else {
595: print $client "error:$!\n";
596: }
597: } else {
598: print $client "error:$!\n";
599: }
600: # ------------------------------------------------------------------------ keys
601: } elsif ($userinput =~ /^keys/) {
602: my ($cmd,$udom,$uname,$namespace)
603: =split(/:/,$userinput);
604: $namespace=~s/\W//g;
605: chomp($namespace);
606: my $proname=propath($udom,$uname);
607: my $qresult='';
608: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
609: foreach $key (keys %hash) {
610: $qresult.="$key&";
611: }
612: if (dbmclose(%hash)) {
613: $qresult=~s/\&$//;
614: print $client "$qresult\n";
615: } else {
616: print $client "error:$!\n";
617: }
618: } else {
619: print $client "error:$!\n";
620: }
621: # ------------------------------------------------------------------------ dump
622: } elsif ($userinput =~ /^dump/) {
623: my ($cmd,$udom,$uname,$namespace)
624: =split(/:/,$userinput);
625: $namespace=~s/\W//g;
626: chomp($namespace);
627: my $proname=propath($udom,$uname);
628: my $qresult='';
629: if (dbmopen(%hash,"$proname/$namespace.db",0644)) {
630: foreach $key (keys %hash) {
631: $qresult.="$key=$hash{$key}&";
632: }
633: if (dbmclose(%hash)) {
634: $qresult=~s/\&$//;
635: print $client "$qresult\n";
636: } else {
637: print $client "error:$!\n";
638: }
639: } else {
640: print $client "error:$!\n";
641: }
642: # ----------------------------------------------------------------------- idput
643: } elsif ($userinput =~ /^idput/) {
644: my ($cmd,$udom,$what)=split(/:/,$userinput);
645: chomp($what);
646: $udom=~s/\W//g;
647: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
648: my $now=time;
649: {
650: my $hfh;
651: if (
652: $hfh=IO::File->new(">>$proname.hist")
653: ) { print $hfh "P:$now:$what\n"; }
654: }
655: my @pairs=split(/\&/,$what);
656: if (dbmopen(%hash,"$proname.db",0644)) {
657: foreach $pair (@pairs) {
658: ($key,$value)=split(/=/,$pair);
659: $hash{$key}=$value;
660: }
661: if (dbmclose(%hash)) {
662: print $client "ok\n";
663: } else {
664: print $client "error:$!\n";
665: }
666: } else {
667: print $client "error:$!\n";
668: }
669: # ----------------------------------------------------------------------- idget
670: } elsif ($userinput =~ /^idget/) {
671: my ($cmd,$udom,$what)=split(/:/,$userinput);
672: chomp($what);
673: $udom=~s/\W//g;
674: my $proname="$perlvar{'lonUsersDir'}/$udom/ids";
675: my @queries=split(/\&/,$what);
676: my $qresult='';
677: if (dbmopen(%hash,"$proname.db",0644)) {
678: for ($i=0;$i<=$#queries;$i++) {
679: $qresult.="$hash{$queries[$i]}&";
680: }
681: if (dbmclose(%hash)) {
682: $qresult=~s/\&$//;
683: print $client "$qresult\n";
684: } else {
685: print $client "error:$!\n";
686: }
687: } else {
688: print $client "error:$!\n";
689: }
690: # ------------------------------------------------------------- unknown command
691: } else {
692: # unknown command
693: print $client "unknown_cmd\n";
694: }
695: # ------------------------------------------------------ client unknown, refuse
696: }
697: } else {
698: print $client "refused\n";
699: &logthis("Rejected client $clientip, closing connection");
700: }
701: &logthis("Disconnect from $clientip ($hostid{$clientip})");
702: # =============================================================================
703: }
704:
705: # tidy up gracefully and finish
706:
707: # this exit is VERY important, otherwise the child will become
708: # a producer of more and more children, forking yourself into
709: # process death.
710: exit;
711: }
712: }
713:
714:
715:
716:
717:
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