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Diff for /loncom/Attic/lonc between versions 1.6 and 1.29

version 1.6, 2000/02/10 23:20:13 version 1.29, 2002/02/25 15:48:11
Line 5 Line 5
 # provides persistent TCP connections to the other servers in the network  # provides persistent TCP connections to the other servers in the network
 # through multiplexed domain sockets  # through multiplexed domain sockets
 #  #
   # $Id$
   #
   # Copyright Michigan State University Board of Trustees
   #
   # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   #
   # LON-CAPA is free software; you can redistribute it and/or modify
   # it under the terms of the GNU General Public License as published by
   # the Free Software Foundation; either version 2 of the License, or
   # (at your option) any later version.
   #
   # LON-CAPA is distributed in the hope that it will be useful,
   # but WITHOUT ANY WARRANTY; without even the implied warranty of
   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   # GNU General Public License for more details.
   #
   # You should have received a copy of the GNU General Public License
   # along with LON-CAPA; if not, write to the Free Software
   # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   #
   # /home/httpd/html/adm/gpl.txt
   #
   # http://www.lon-capa.org/
   #
 # PID in subdir logs/lonc.pid  # PID in subdir logs/lonc.pid
 # kill kills  # kill kills
 # HUP restarts  # HUP restarts
Line 12 Line 36
   
 # 6/4/99,6/5,6/7,6/8,6/9,6/10,6/11,6/12,7/14,7/19,  # 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,  # 10/8,10/9,10/15,11/18,12/22,
 # 2/8 Gerd Kortemeyer   # 2/8,7/25 Gerd Kortemeyer
   # 12/05 Scott Harrison
   # 12/05 Gerd Kortemeyer
   # YEAR=2001
   # 01/10/01 Scott Harrison
   # 03/14/01,03/15,06/12,11/26,11/27,11/28 Gerd Kortemeyer
   # 12/20 Scott Harrison
   # YEAR=2002
   # 2/19/02,02/22/02,02/25/02 Gerd Kortemeyer
   # 
 # based on nonforker from Perl Cookbook  # based on nonforker from Perl Cookbook
 # - server who multiplexes without forking  # - server who multiplexes without forking
   
Line 24  use Socket; Line 57  use Socket;
 use Fcntl;  use Fcntl;
 use Tie::RefHash;  use Tie::RefHash;
 use Crypt::IDEA;  use Crypt::IDEA;
   use Net::Ping;
   use LWP::UserAgent();
   
 $childmaxattempts=10;  my $status='';
   my $lastlog='';
   
 # ------------------------------------ Read httpd access.conf and get variables  # grabs exception and records it to log before exiting
   sub catchexception {
       my ($signal)=@_;
       $SIG{QUIT}='DEFAULT';
       $SIG{__DIE__}='DEFAULT';
       chomp($signal);
       &logthis("<font color=red>CRITICAL: "
        ."ABNORMAL EXIT. Child $$ for server [$wasserver] died through "
        ."\"$signal\" with parameter [$@]</font>");
       die($@);
   }
   
   $childmaxattempts=5;
   
   # -------------------------------------- Routines to see if other box available
   
   sub online {
       my $host=shift;
       &status("Pinging ".$host);
       my $p=Net::Ping->new("tcp",20);
       my $online=$p->ping("$host");
       $p->close();
       undef ($p);
       return $online;
   }
   
   sub connected {
       my ($local,$remote)=@_;
       &status("Checking connection $local to $remote");
       $local=~s/\W//g;
       $remote=~s/\W//g;
   
       unless ($hostname{$local}) { return 'local_unknown'; }
       unless ($hostname{$remote}) { return 'remote_unknown'; }
   
       unless (&online($hostname{$local})) { return 'local_offline'; }
   
       my $ua=new LWP::UserAgent;
       
       my $request=new HTTP::Request('GET',
         "http://".$hostname{$local}.'/cgi-bin/ping.pl?'.$remote);
   
       my $response=$ua->request($request);
   
       unless ($response->is_success) { return 'local_error'; }
   
       my $reply=$response->content;
       $reply=(split("\n",$reply))[0];
       $reply=~s/\W//g;
       if ($reply ne $remote) { return $reply; }
       return 'ok';
   }
   
   
   # -------------------------------- Set signal handlers to record abnormal exits
   
   &status("Init exception handlers");
   $SIG{QUIT}=\&catchexception;
   $SIG{__DIE__}=\&catchexception;
   
   # ------------------------------------ Read httpd access.conf and get variables
   &status("Read access.conf");
 open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";  open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
   
 while ($configline=<CONFIG>) {  while ($configline=<CONFIG>) {
Line 40  while ($configline=<CONFIG>) { Line 136  while ($configline=<CONFIG>) {
 }  }
 close(CONFIG);  close(CONFIG);
   
   # ----------------------------- Make sure this process is running from user=www
   &status("Check user ID");
   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  # ------------------------------------------------------------- Read hosts file
   
 open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";  open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
Line 47  open (CONFIG,"$perlvar{'lonTabDir'}/host Line 165  open (CONFIG,"$perlvar{'lonTabDir'}/host
 while ($configline=<CONFIG>) {  while ($configline=<CONFIG>) {
     my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);      my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
     chomp($ip);      chomp($ip);
     $hostip{$id}=$ip;      if ($ip) {
        $hostip{$id}=$ip;
        $hostname{$id}=$name;
       }
 }  }
   
 close(CONFIG);  close(CONFIG);
   
 # -------------------------------------------------------- Routines for forking  # -------------------------------------------------------- Routines for forking
Line 72  sub REAPER {                        # ta Line 194  sub REAPER {                        # ta
     unlink($port);      unlink($port);
 }  }
   
   sub hangup {
       foreach (keys %children) {
           $wasserver=$children{$_};
           &status("Closing $wasserver");
           &logthis('Closing '.$wasserver.': '.&subreply('exit',$wasserver));
           &status("Kill PID $_ for $wasserver");
    kill ('INT',$_);
       }
   }
   
 sub HUNTSMAN {                      # signal handler for SIGINT  sub HUNTSMAN {                      # signal handler for SIGINT
     local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children      local($SIG{CHLD}) = 'IGNORE';   # we're going to kill our children
     kill 'INT' => keys %children;      &hangup();
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     unlink("$execdir/logs/lonc.pid");      unlink("$execdir/logs/lonc.pid");
     &logthis("<font color=red>CRITICAL: Shutting down</font>");      &logthis("<font color=red>CRITICAL: Shutting down</font>");
Line 83  sub HUNTSMAN {                      # si Line 215  sub HUNTSMAN {                      # si
   
 sub HUPSMAN {                      # signal handler for SIGHUP  sub HUPSMAN {                      # signal handler for SIGHUP
     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children      local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
     kill 'INT' => keys %children;      &hangup();
     &logthis("<font color=red>CRITICAL: Restarting</font>");      &logthis("<font color=red>CRITICAL: Restarting</font>");
       unlink("$execdir/logs/lonc.pid");
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     exec("$execdir/lonc");         # here we go again      exec("$execdir/lonc");         # here we go again
 }  }
   
   sub checkchildren {
       &initnewstatus();
       &logstatus();
       &logthis('Going to check on the children');
       foreach (sort keys %children) {
    sleep 1;
           unless (kill 'USR1' => $_) {
       &logthis ('<font color=red>CRITICAL: Child '.$_.' is dead</font>');
               &logstatus($$.' is dead');
           } 
       }
   }
   
 sub USRMAN {  sub USRMAN {
     &logthis("USR1: Trying to establish connections again");      &logthis("USR1: Trying to establish connections again");
     foreach $thisserver (keys %hostip) {  
  $answer=subreply("ping",$thisserver);  
         &logthis("USR1: Ping $thisserver "  
         ."(pid >$childpid{$thisserver}<, $childatt{thisserver} attempts): "  
         ." >$answer<");  
     }  
     %childatt=();      %childatt=();
       &checkchildren();
 }  }
   
 # -------------------------------------------------- Non-critical communication  # -------------------------------------------------- Non-critical communication
Line 110  sub subreply { Line 251  sub subreply {
                                       Type    => SOCK_STREAM,                                        Type    => SOCK_STREAM,
                                       Timeout => 10)                                        Timeout => 10)
        or return "con_lost";         or return "con_lost";
     print $sclient "$cmd\n";  
     my $answer=<$sclient>;  
     chomp($answer);      $SIG{ALRM}=sub { die "timeout" };
     if (!$answer) { $answer="con_lost"; }      $SIG{__DIE__}='DEFAULT';
       eval {
        alarm(10);
        print $sclient "$cmd\n";
        $answer=<$sclient>;
        chomp($answer);
        alarm(0);
       };
       if ((!$answer) || ($@=~/timeout/)) { $answer="con_lost"; }
       $SIG{ALRM}='DEFAULT';
       $SIG{__DIE__}=\&catchexception;
  } else { $answer='self_reply'; }   } else { $answer='self_reply'; }
  return $answer;   return $answer;
 }  }
Line 126  sub logthis { Line 277  sub logthis {
     my $fh=IO::File->new(">>$execdir/logs/lonc.log");      my $fh=IO::File->new(">>$execdir/logs/lonc.log");
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     print $fh "$local ($$): $message\n";      $lastlog=$local.': '.$message;
       print $fh "$local ($$) [$status]: $message\n";
 }  }
   
   
Line 138  sub logperm { Line 290  sub logperm {
     my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");      my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");
     print $fh "$now:$message:$local\n";      print $fh "$now:$message:$local\n";
 }  }
   # ------------------------------------------------------------------ Log status
   
 # ---------------------------------------------------- Fork once and dissociate  sub logstatus {
       my $docdir=$perlvar{'lonDocRoot'};
       my $fh=IO::File->new(">>$docdir/lon-status/loncstatus.txt");
       print $fh $$."\t".$status."\t".$lastlog."\n";
   }
   
   sub initnewstatus {
       my $docdir=$perlvar{'lonDocRoot'};
       my $fh=IO::File->new(">$docdir/lon-status/loncstatus.txt");
       my $now=time;
       my $local=localtime($now);
       print $fh "LONC status $local - parent $$\n\n";
   }
   
   # -------------------------------------------------------------- Status setting
   
   sub status {
       my $what=shift;
       my $now=time;
       my $local=localtime($now);
       $status=$local.': '.$what;
   }
   
   
   # ---------------------------------------------------- Fork once and dissociate
   &status("Fork and dissociate");
 $fpid=fork;  $fpid=fork;
 exit if $fpid;  exit if $fpid;
 die "Couldn't fork: $!" unless defined ($fpid);  die "Couldn't fork: $!" unless defined ($fpid);
Line 148  die "Couldn't fork: $!" unless defined ( Line 325  die "Couldn't fork: $!" unless defined (
 POSIX::setsid() or die "Can't start new session: $!";  POSIX::setsid() or die "Can't start new session: $!";
   
 # ------------------------------------------------------- Write our PID on disk  # ------------------------------------------------------- Write our PID on disk
   &status("Write PID");
 $execdir=$perlvar{'lonDaemons'};  $execdir=$perlvar{'lonDaemons'};
 open (PIDSAVE,">$execdir/logs/lonc.pid");  open (PIDSAVE,">$execdir/logs/lonc.pid");
 print PIDSAVE "$$\n";  print PIDSAVE "$$\n";
Line 161  $SIG{HUP}=$SIG{USR1}='IGNORE'; Line 338  $SIG{HUP}=$SIG{USR1}='IGNORE';
           
 # Fork off our children, one for every server  # Fork off our children, one for every server
   
   &status("Forking ...");
   
 foreach $thisserver (keys %hostip) {  foreach $thisserver (keys %hostip) {
     make_new_child($thisserver);      if (&online($hostname{$thisserver})) {
          make_new_child($thisserver);
       }
 }  }
   
 &logthis("Done starting initial servers");  &logthis("Done starting initial servers");
Line 175  $SIG{USR1} = \&USRMAN; Line 356  $SIG{USR1} = \&USRMAN;
   
 # And maintain the population.  # And maintain the population.
 while (1) {  while (1) {
       &status("Sleeping");
     sleep;                          # wait for a signal (i.e., child's death)      sleep;                          # wait for a signal (i.e., child's death)
                                     # See who died and start new one                                      # See who died and start new one
       &status("Woke up");
     foreach $thisserver (keys %hostip) {      foreach $thisserver (keys %hostip) {
         if (!$childpid{$thisserver}) {          if (!$childpid{$thisserver}) {
     if ($childatt{$thisserver}<=$childmaxattempts) {      if (($childatt{$thisserver}<$childmaxattempts) &&
                   (&online($hostname{$thisserver}))) {
        $childatt{$thisserver}++;         $childatt{$thisserver}++;
                &logthis(                 &logthis(
    "<font color=yellow>INFO: Trying to reconnect for $thisserver "     "<font color=yellow>INFO: Trying to reconnect for $thisserver "
   ."($childatt{$thisserver} of $childmaxattempts attempts)</font>");     ."(".($childatt{$thisserver}?$childatt{$thisserver}:'none').
      " of $childmaxattempts attempts)</font>"); 
                make_new_child($thisserver);                 make_new_child($thisserver);
     }     } else {
                  &logthis(
      "<font color=yellow>INFO: Skipping $thisserver "
     ."($childatt{$thisserver} of $childmaxattempts attempts)</font>");
              } 
                  
         }                 }       
     }      }
 }  }
Line 214  sub make_new_child { Line 404  sub make_new_child {
     } else {      } else {
         # Child can *not* return from this subroutine.          # Child can *not* return from this subroutine.
         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before          $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before
               $SIG{USR1}= \&logstatus;
      
         # unblock signals          # unblock signals
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or die "Can't unblock SIGINT for fork: $!\n";
Line 224  sub make_new_child { Line 415  sub make_new_child {
 $port = "$perlvar{'lonSockDir'}/$conserver";  $port = "$perlvar{'lonSockDir'}/$conserver";
   
 unlink($port);  unlink($port);
 # ---------------------------------------------------- Client to network server  
 unless (  
   $remotesock = IO::Socket::INET->new(PeerAddr => $hostip{$conserver},  
                                       PeerPort => $perlvar{'londPort'},  
                                       Proto    => "tcp",  
                                       Type     => SOCK_STREAM)  
    ) {   
        my $st=120+int(rand(240));  
        &logthis(  
 "<font color=blue>WARNING: Couldn't connect $conserver ($st secs): $@</font>");  
        sleep($st);  
        exit;   
      };  
 # --------------------------------------- Send a ping to make other end do USR1  
 print $remotesock "init\n";  
 $answer=<$remotesock>;  
 print $remotesock "$answer";  
 $answer=<$remotesock>;  
 chomp($answer);  
 &logthis("Init reply for $conserver: >$answer<");  
 sleep 5;  
 print $remotesock "pong\n";  
 $answer=<$remotesock>;  
 chomp($answer);  
 &logthis("Pong reply for $conserver: >$answer<");  
 # ----------------------------------------------------------- Initialize cipher  
   
 print $remotesock "ekey\n";  # -------------------------------------------------------------- Open other end
 my $buildkey=<$remotesock>;  
 my $key=$conserver.$perlvar{'lonHostID'};  
 $key=~tr/a-z/A-Z/;  
 $key=~tr/G-P/0-9/;  
 $key=~tr/Q-Z/0-9/;  
 $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;  
 $key=substr($key,0,32);  
 my $cipherkey=pack("H32",$key);  
 if ($cipher=new IDEA $cipherkey) {  
    &logthis("Secure connection inititalized: $conserver");  
 } else {  
    my $st=120+int(rand(240));  
    &logthis(  
      "<font color=blue>WARNING: ".  
      "Could not establish secure connection, $conserver ($st secs)!</font>");  
    sleep($st);  
    exit;  
 }  
   
 # ----------------------------------------- We're online, send delayed messages  &openremote($conserver);
   
   # ----------------------------------------- We're online, send delayed messages
       &status("Checking for delayed messages");
     my @allbuffered;      my @allbuffered;
     my $path="$perlvar{'lonSockDir'}/delayed";      my $path="$perlvar{'lonSockDir'}/delayed";
     opendir(DIRHANDLE,$path);      opendir(DIRHANDLE,$path);
     @allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;      @allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;
     closedir(DIRHANDLE);      closedir(DIRHANDLE);
     my $dfname;      my $dfname;
     map {      foreach (@allbuffered) {
           &status("Sending delayed $conserver $_");
         $dfname="$path/$_";          $dfname="$path/$_";
         &logthis($dfname);          &logthis('Sending '.$dfname);
         my $wcmd;          my $wcmd;
         {          {
          my $dfh=IO::File->new($dfname);           my $dfh=IO::File->new($dfname);
Line 302  if ($cipher=new IDEA $cipherkey) { Line 452  if ($cipher=new IDEA $cipherkey) {
             }              }
             $cmd="enc:$cmdlength:$encrequest\n";              $cmd="enc:$cmdlength:$encrequest\n";
         }          }
       $SIG{ALRM}=sub { die "timeout" };
       $SIG{__DIE__}='DEFAULT';
       eval {
           alarm(60);
         print $remotesock "$cmd\n";          print $remotesock "$cmd\n";
         $answer=<$remotesock>;          $answer=<$remotesock>;
  chomp($answer);   chomp($answer);
         if ($answer ne '') {          alarm(0);
       };
       $SIG{ALRM}='DEFAULT';
       $SIG{__DIE__}=\&catchexception;
   
           if (($answer ne '') && ($@!~/timeout/)) {
     unlink("$dfname");      unlink("$dfname");
             &logthis("Delayed $cmd to $conserver: >$answer<");              &logthis("Delayed $cmd to $conserver: >$answer<");
             &logperm("S:$conserver:$bcmd");              &logperm("S:$conserver:$bcmd");
         }                  }        
     } @allbuffered;      }
   
 # ------------------------------------------------------- Listen to UNIX socket  # ------------------------------------------------------- Listen to UNIX socket
   &status("Opening socket $conserver");
 unless (  unless (
   $server = IO::Socket::UNIX->new(Local  => $port,    $server = IO::Socket::UNIX->new(Local  => $port,
                                   Type   => SOCK_STREAM,                                    Type   => SOCK_STREAM,
Line 351  while (1) { Line 510  while (1) {
     # check for new information on the connections we have      # check for new information on the connections we have
   
     # anything to read or accept?      # anything to read or accept?
     foreach $client ($select->can_read(1)) {      foreach $client ($select->can_read(0.1)) {
   
         if ($client == $server) {          if ($client == $server) {
             # accept a new connection              # accept a new connection
               &status("Accept new connection: $conserver");
             $client = $server->accept();              $client = $server->accept();
             $select->add($client);              $select->add($client);
             nonblock($client);              nonblock($client);
Line 370  while (1) { Line 529  while (1) {
                 delete $outbuffer{$client};                  delete $outbuffer{$client};
                 delete $ready{$client};                  delete $ready{$client};
   
                   &status("Idle $conserver");
                 $select->remove($client);                  $select->remove($client);
                 close $client;                  close $client;
                 next;                  next;
Line 398  while (1) { Line 558  while (1) {
         next unless exists $outbuffer{$client};          next unless exists $outbuffer{$client};
   
         $rv = $client->send($outbuffer{$client}, 0);          $rv = $client->send($outbuffer{$client}, 0);
   
         unless ($outbuffer{$client}=~/con_lost\n$/) {
         unless (defined $rv) {          unless (defined $rv) {
             # Whine, but move on.              # 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;              next;
         }          }
           $errno=$!;
         if (($rv == length $outbuffer{$client}) ||          if (($rv == length $outbuffer{$client}) ||
             ($! == POSIX::EWOULDBLOCK)) {              ($errno == POSIX::EWOULDBLOCK) || ($errno == 0)) {
             substr($outbuffer{$client}, 0, $rv) = '';              substr($outbuffer{$client}, 0, $rv) = '';
             delete $outbuffer{$client} unless length $outbuffer{$client};              delete $outbuffer{$client} unless length $outbuffer{$client};
         } else {          } else {
             # Couldn't write all the data, and it wasn't because              # Couldn't write all the data, and it wasn't because
             # it would have blocked.  Shutdown and move on.              # it would have blocked.  Shutdown and move on.
   
       &logthis("Dropping data with ".$errno.": ".
                        length($outbuffer{$client}).", $rv");
   
             delete $inbuffer{$client};              delete $inbuffer{$client};
             delete $outbuffer{$client};              delete $outbuffer{$client};
             delete $ready{$client};              delete $ready{$client};
Line 418  while (1) { Line 585  while (1) {
             close($client);              close($client);
             next;              next;
         }          }
         } else {
   # -------------------------------------------------------- Wow, connection lost
            &logthis(
        "<font color=red>CRITICAL: Closing connection $conserver</font>");
    &status("Connection lost $conserver");
            $remotesock->shutdown(2);
            &logthis("Attempting to open new connection");
            &openremote($conserver);          
         }
     }      }
      
 }  }
 }  }
   
Line 435  sub handle { Line 612  sub handle {
 # ============================================================= Process request  # ============================================================= Process request
         # $request is the text of the request          # $request is the text of the request
         # put text of reply into $outbuffer{$client}          # put text of reply into $outbuffer{$client}
   # ------------------------------------------------------------ Is this the end?
           if ($request eq "close_connection_exit\n") {
       &status("Request close connection: $conserver");
              &logthis(
        "<font color=red>CRITICAL: Request Close Connection $conserver</font>");
              $remotesock->shutdown(2);
              $server->close();
              exit;
           }
 # -----------------------------------------------------------------------------  # -----------------------------------------------------------------------------
         if ($request =~ /^encrypt\:/) {          if ($request =~ /^encrypt\:/) {
     my $cmd=$request;      my $cmd=$request;
Line 449  sub handle { Line 635  sub handle {
             }              }
             $request="enc:$cmdlength:$encrequest\n";              $request="enc:$cmdlength:$encrequest\n";
         }          }
   # --------------------------------------------------------------- Main exchange
       $SIG{ALRM}=sub { die "timeout" };
       $SIG{__DIE__}='DEFAULT';
       eval {
           alarm(300);
           &status("Sending $conserver: $request");
         print $remotesock "$request";          print $remotesock "$request";
           &status("Waiting for reply from $conserver: $request");
         $answer=<$remotesock>;          $answer=<$remotesock>;
           &status("Received reply: $request");
           alarm(0);
       };
       if ($@=~/timeout/) { 
          $answer='';
          &logthis(
           "<font color=red>CRITICAL: Timeout $conserver: $request</font>");
       }  
       $SIG{ALRM}='DEFAULT';
       $SIG{__DIE__}=\&catchexception;
   
   
         if ($answer) {          if ($answer) {
    if ($answer =~ /^enc/) {     if ($answer =~ /^enc/) {
                my ($cmd,$cmdlength,$encinput)=split(/:/,$answer);                 my ($cmd,$cmdlength,$encinput)=split(/:/,$answer);
Line 472  sub handle { Line 677  sub handle {
 # ===================================================== Done processing request  # ===================================================== Done processing request
     }      }
     delete $ready{$client};      delete $ready{$client};
       &status("Completed $conserver: $request");
 # -------------------------------------------------------------- End non-forker  # -------------------------------------------------------------- End non-forker
 }  }
 # ---------------------------------------------------------- End make_new_child  # ---------------------------------------------------------- End make_new_child
Line 490  sub nonblock { Line 696  sub nonblock {
 }  }
   
   
   sub openremote {
   # ---------------------------------------------------- Client to network server
   
       my $conserver=shift;
   
   &status("Opening TCP: $conserver");
   
   unless (
     $remotesock = IO::Socket::INET->new(PeerAddr => $hostip{$conserver},
                                         PeerPort => $perlvar{'londPort'},
                                         Proto    => "tcp",
                                         Type     => SOCK_STREAM)
      ) { 
          my $st=120+int(rand(240));
          &logthis(
   "<font color=blue>WARNING: Couldn't connect $conserver ($st secs): $@</font>");
          sleep($st);
          exit; 
        };
   # ----------------------------------------------------------------- Init dialog
   
   &status("Init dialogue: $conserver");
   
        $SIG{ALRM}=sub { die "timeout" };
        $SIG{__DIE__}='DEFAULT';
        eval {
            alarm(60);
   print $remotesock "init\n";
   $answer=<$remotesock>;
   print $remotesock "$answer";
   $answer=<$remotesock>;
   chomp($answer);
             alarm(0);
        };
        $SIG{ALRM}='DEFAULT';
        $SIG{__DIE__}=\&catchexception;
    
        if ($@=~/timeout/) {
    &logthis("Timed out during init: $conserver");
            exit;
        }
   
   if ($answer ne 'ok') {
          &logthis("Init reply for $conserver: >$answer<");
          my $st=120+int(rand(240));
          &logthis(
   "<font color=blue>WARNING: Init failed $conserver ($st secs)</font>");
          sleep($st);
          exit; 
   }
   
   sleep 5;
   &status("Ponging $conserver");
   print $remotesock "pong\n";
   $answer=<$remotesock>;
   chomp($answer);
   if ($answer!~/^$converver/) {
      &logthis("Pong reply for $conserver: >$answer<");
   }
   # ----------------------------------------------------------- Initialize cipher
   
   &status("Initialize cipher: $conserver");
   print $remotesock "ekey\n";
   my $buildkey=<$remotesock>;
   my $key=$conserver.$perlvar{'lonHostID'};
   $key=~tr/a-z/A-Z/;
   $key=~tr/G-P/0-9/;
   $key=~tr/Q-Z/0-9/;
   $key=$key.$buildkey.$key.$buildkey.$key.$buildkey;
   $key=substr($key,0,32);
   my $cipherkey=pack("H32",$key);
   if ($cipher=new IDEA $cipherkey) {
      &logthis("Secure connection initialized: $conserver");
   } else {
      my $st=120+int(rand(240));
      &logthis(
        "<font color=blue>WARNING: ".
        "Could not establish secure connection, $conserver ($st secs)!</font>");
      sleep($st);
      exit;
   }
   
   }
   
   # ----------------------------------- POD (plain old documentation, CPAN style)
   
   =head1 NAME
   
   lonc - LON TCP-MySQL-Server Daemon for handling database requests.
   
   =head1 SYNOPSIS
   
   Should only be run as user=www.  This is a command-line script which
   is invoked by loncron.
   
   =head1 DESCRIPTION
   
   Provides persistent TCP connections to the other servers in the network
   through multiplexed domain sockets
   
    PID in subdir logs/lonc.pid
    kill kills
    HUP restarts
    USR1 tries to open connections again
   
   =head1 README
   
   Not yet written.
   
   =head1 PREREQUISITES
   
   POSIX
   IO::Socket
   IO::Select
   IO::File
   Socket
   Fcntl
   Tie::RefHash
   Crypt::IDEA
   
   =head1 COREQUISITES
   
   =head1 OSNAMES
   
   linux
   
   =head1 SCRIPT CATEGORIES
   
   Server/Process
   
   =cut
Removed from v.1.6  
changed lines
  Added in v.1.29

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