--- loncom/Attic/lonc 1999/10/13 17:48:51 1.1 +++ loncom/Attic/lonc 2001/03/15 20:25:20 1.15 @@ -10,7 +10,14 @@ # HUP restarts # USR1 tries to open connections again -# 6/4/99,6/5,6/7,6/8,6/9,6/10,6/11,6/12,7/14,7/19,10/8,10/9 Gerd Kortemeyer +# 6/4/99,6/5,6/7,6/8,6/9,6/10,6/11,6/12,7/14,7/19, +# 10/8,10/9,10/15,11/18,12/22, +# 2/8,7/25 Gerd Kortemeyer +# 12/05 Scott Harrison +# 12/05 Gerd Kortemeyer +# 01/10/01 Scott Harrison +# 03/14/01,03/15 Gerd Kortemeyer +# # based on nonforker from Perl Cookbook # - server who multiplexes without forking @@ -23,6 +30,24 @@ use Fcntl; use Tie::RefHash; use Crypt::IDEA; +# grabs exception and records it to log before exiting +sub catchexception { + my ($signal)=@_; + $SIG{'QUIT'}='DEFAULT'; + $SIG{__DIE__}='DEFAULT'; + &logthis("CRITICAL: " + ."ABNORMAL EXIT. Child $$ for server $wasserver died through " + ."\"$signal\" with this parameter->[$@]"); + die($@); +} + +$childmaxattempts=10; + +# -------------------------------- Set signal handlers to record abnormal exits + +$SIG{'QUIT'}=\&catchexception; +$SIG{__DIE__}=\&catchexception; + # ------------------------------------ Read httpd access.conf and get variables open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf"; @@ -30,11 +55,33 @@ open (CONFIG,"/etc/httpd/conf/access.con while ($configline=) { if ($configline =~ /PerlSetVar/) { my ($dummy,$varname,$varvalue)=split(/\s+/,$configline); + chomp($varvalue); $perlvar{$varname}=$varvalue; } } close(CONFIG); +# ----------------------------- Make sure this process is running from user=www +my $wwwid=getpwnam('www'); +if ($wwwid!=$<) { + $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}"; + $subj="LON: $perlvar{'lonHostID'} User ID mismatch"; + system("echo 'User ID mismatch. lonc must be run as user www.' |\ + mailto $emailto -s '$subj' > /dev/null"); + exit 1; +} + +# --------------------------------------------- Check if other instance running + +my $pidfile="$perlvar{'lonDaemons'}/logs/lonc.pid"; + +if (-e $pidfile) { + my $lfh=IO::File->new("$pidfile"); + my $pide=<$lfh>; + chomp($pide); + if (kill 0 => $pide) { die "already running"; } +} + # ------------------------------------------------------------- Read hosts file open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file"; @@ -59,7 +106,8 @@ sub REAPER { # ta $SIG{CHLD} = \&REAPER; my $pid = wait; my $wasserver=$children{$pid}; - &logthis("Child $pid for server $wasserver died"); + &logthis("CRITICAL: " + ."Child $pid for server $wasserver died ($childatt{$wasserver})"); delete $children{$pid}; delete $childpid{$wasserver}; my $port = "$perlvar{'lonSockDir'}/$wasserver"; @@ -71,31 +119,34 @@ sub HUNTSMAN { # si kill 'INT' => keys %children; my $execdir=$perlvar{'lonDaemons'}; unlink("$execdir/logs/lonc.pid"); - &logthis("Shutting down"); + &logthis("CRITICAL: Shutting down"); exit; # clean up with dignity } sub HUPSMAN { # signal handler for SIGHUP local($SIG{CHLD}) = 'IGNORE'; # we're going to kill our children kill 'INT' => keys %children; - &logthis("Restarting"); + &logthis("CRITICAL: Restarting"); + unlink("$execdir/logs/lonc.pid"); my $execdir=$perlvar{'lonDaemons'}; exec("$execdir/lonc"); # here we go again } sub USRMAN { - %childatt=(); &logthis("USR1: Trying to establish connections again"); foreach $thisserver (keys %hostip) { $answer=subreply("ping",$thisserver); - &logthis( - "USR1: Ping $thisserver (pid >$childpid{$thisserver}<): >$answer<"); + &logthis("USR1: Ping $thisserver " + ."(pid >$childpid{$thisserver}<, $childatt{thisserver} attempts): " + ." >$answer<"); } + %childatt=(); } # -------------------------------------------------- Non-critical communication sub subreply { my ($cmd,$server)=@_; + my $answer=''; if ($server ne $perlvar{'lonHostID'}) { my $peerfile="$perlvar{'lonSockDir'}/$server"; my $sclient=IO::Socket::UNIX->new(Peer =>"$peerfile", @@ -121,6 +172,16 @@ sub logthis { print $fh "$local ($$): $message\n"; } + +sub logperm { + my $message=shift; + my $execdir=$perlvar{'lonDaemons'}; + my $now=time; + my $local=localtime($now); + my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log"); + print $fh "$now:$message:$local\n"; +} + # ---------------------------------------------------- Fork once and dissociate $fpid=fork; @@ -135,7 +196,7 @@ $execdir=$perlvar{'lonDaemons'}; open (PIDSAVE,">$execdir/logs/lonc.pid"); print PIDSAVE "$$\n"; close(PIDSAVE); -&logthis("---------- Starting ----------"); +&logthis("CRITICAL: ---------- Starting ----------"); # ----------------------------- Ignore signals generated during initial startup $SIG{HUP}=$SIG{USR1}='IGNORE'; @@ -161,9 +222,12 @@ while (1) { # See who died and start new one foreach $thisserver (keys %hostip) { if (!$childpid{$thisserver}) { - if ($childatt{$thisserver}<5) { + if ($childatt{$thisserver}<=$childmaxattempts) { + $childatt{$thisserver}++; + &logthis( + "INFO: Trying to reconnect for $thisserver " + ."($childatt{$thisserver} of $childmaxattempts attempts)"); make_new_child($thisserver); - $childatt{$thisserver}++; } } } @@ -209,15 +273,20 @@ unless ( PeerPort => $perlvar{'londPort'}, Proto => "tcp", Type => SOCK_STREAM) - ) { &logthis("Couldn't connect $conserver: $@"); - sleep(5); + ) { + my $st=120+int(rand(240)); + &logthis( +"WARNING: Couldn't connect $conserver ($st secs): $@"); + sleep($st); exit; }; # --------------------------------------- Send a ping to make other end do USR1 -print $remotesock "ping\n"; +print $remotesock "init\n"; +$answer=<$remotesock>; +print $remotesock "$answer"; $answer=<$remotesock>; chomp($answer); -&logthis("Ping reply for $conserver: >$answer<"); +&logthis("Init reply for $conserver: >$answer<"); sleep 5; print $remotesock "pong\n"; $answer=<$remotesock>; @@ -235,24 +304,77 @@ $key=$key.$buildkey.$key.$buildkey.$key. $key=substr($key,0,32); my $cipherkey=pack("H32",$key); if ($cipher=new IDEA $cipherkey) { - &logthis("Secure connection inititalized: $conserver"); + &logthis("Secure connection initialized: $conserver"); } else { - &logthis("Error: Could not establish secure connection, $conserver!"); -} + my $st=120+int(rand(240)); + &logthis( + "WARNING: ". + "Could not establish secure connection, $conserver ($st secs)!"); + sleep($st); + exit; +} + +# ----------------------------------------- We're online, send delayed messages + + my @allbuffered; + my $path="$perlvar{'lonSockDir'}/delayed"; + opendir(DIRHANDLE,$path); + @allbuffered=grep /\.$conserver$/, readdir DIRHANDLE; + closedir(DIRHANDLE); + my $dfname; + map { + $dfname="$path/$_"; + &logthis($dfname); + my $wcmd; + { + my $dfh=IO::File->new($dfname); + $cmd=<$dfh>; + } + chomp($cmd); + my $bcmd=$cmd; + if ($cmd =~ /^encrypt\:/) { + my $rcmd=$cmd; + $rcmd =~ s/^encrypt\://; + chomp($rcmd); + my $cmdlength=length($rcmd); + $rcmd.=" "; + my $encrequest=''; + for (my $encidx=0;$encidx<=$cmdlength;$encidx+=8) { + $encrequest.= + unpack("H16",$cipher->encrypt(substr($rcmd,$encidx,8))); + } + $cmd="enc:$cmdlength:$encrequest\n"; + } + print $remotesock "$cmd\n"; + $answer=<$remotesock>; + chomp($answer); + if ($answer ne '') { + unlink("$dfname"); + &logthis("Delayed $cmd to $conserver: >$answer<"); + &logperm("S:$conserver:$bcmd"); + } + } @allbuffered; # ------------------------------------------------------- Listen to UNIX socket unless ( $server = IO::Socket::UNIX->new(Local => $port, Type => SOCK_STREAM, Listen => 10 ) - ) { &logthis("Can't make server socket $conserver: $@"); - sleep(5); + ) { + my $st=120+int(rand(240)); + &logthis( + "WARNING: ". + "Can't make server socket $conserver ($st secs): $@"); + sleep($st); exit; }; # ----------------------------------------------------------------------------- +&logthis("$conserver online"); + +# ----------------------------------------------------------------------------- # begin with empty buffers %inbuffer = (); %outbuffer = (); @@ -321,16 +443,21 @@ while (1) { $rv = $client->send($outbuffer{$client}, 0); unless (defined $rv) { # Whine, but move on. - warn "I was told I could write, but I can't.\n"; + &logthis("I was told I could write, but I can't.\n"); next; } + $errno=$!; if (($rv == length $outbuffer{$client}) || - ($! == POSIX::EWOULDBLOCK)) { + ($errno == POSIX::EWOULDBLOCK) || ($errno == 0)) { substr($outbuffer{$client}, 0, $rv) = ''; delete $outbuffer{$client} unless length $outbuffer{$client}; } else { # Couldn't write all the data, and it wasn't because # it would have blocked. Shutdown and move on. + + &logthis("Dropping data with ".$errno.": ". + length($outbuffer{$client}).", $rv"); + delete $inbuffer{$client}; delete $outbuffer{$client}; delete $ready{$client}; @@ -410,7 +537,3 @@ sub nonblock { or die "Can't make socket nonblocking: $!\n"; } - - - -