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Diff for /loncom/Attic/lonc between versions 1.3 and 1.8

version 1.3, 1999/11/18 19:52:46 version 1.8, 2000/12/05 03:23:59
Line 11 Line 11
 # USR1 tries to open connections again  # 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,  # 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 Gerd Kortemeyer   # 10/8,10/9,10/15,11/18,12/22,
   # 2/8,7/25 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 Fcntl; Line 25  use Fcntl;
 use Tie::RefHash;  use Tie::RefHash;
 use Crypt::IDEA;  use Crypt::IDEA;
   
   $childmaxattempts=10;
   
   # -------------------------------- Set signal handlers to record abnormal exits
   
   $SIG{'QUIT'}=\&catchexception;
   $SIG{__DIE__}=\&catchexception;
   
 # ------------------------------------ Read httpd access.conf and get variables  # ------------------------------------ Read httpd access.conf and get variables
   
 open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";  open (CONFIG,"/etc/httpd/conf/access.conf") 
       || catchdie "Can't read access.conf";
   
 while ($configline=<CONFIG>) {  while ($configline=<CONFIG>) {
     if ($configline =~ /PerlSetVar/) {      if ($configline =~ /PerlSetVar/) {
  my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);   my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
           chomp($varvalue);
         $perlvar{$varname}=$varvalue;          $perlvar{$varname}=$varvalue;
     }      }
 }  }
 close(CONFIG);  close(CONFIG);
   
   # --------------------------------------------- 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) { catchdie "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") 
       || catchdie "Can't read host file";
   
 while ($configline=<CONFIG>) {  while ($configline=<CONFIG>) {
     my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);      my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
Line 60  sub REAPER {                        # ta Line 82  sub REAPER {                        # ta
     $SIG{CHLD} = \&REAPER;      $SIG{CHLD} = \&REAPER;
     my $pid = wait;      my $pid = wait;
     my $wasserver=$children{$pid};      my $wasserver=$children{$pid};
     &logthis("Child $pid for server $wasserver died");      &logthis("<font color=red>CRITICAL: "
        ."Child $pid for server $wasserver died ($childatt{$wasserver})</font>");
     delete $children{$pid};      delete $children{$pid};
     delete $childpid{$wasserver};      delete $childpid{$wasserver};
     my $port = "$perlvar{'lonSockDir'}/$wasserver";      my $port = "$perlvar{'lonSockDir'}/$wasserver";
Line 72  sub HUNTSMAN {                      # si Line 95  sub HUNTSMAN {                      # si
     kill 'INT' => keys %children;      kill 'INT' => keys %children;
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     unlink("$execdir/logs/lonc.pid");      unlink("$execdir/logs/lonc.pid");
     &logthis("Shutting down");      &logthis("<font color=red>CRITICAL: Shutting down</font>");
     exit;                           # clean up with dignity      exit;                           # clean up with dignity
 }  }
   
 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;      kill 'INT' => keys %children;
     &logthis("Restarting");      &logthis("<font color=red>CRITICAL: Restarting</font>");
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     exec("$execdir/lonc");         # here we go again      exec("$execdir/lonc");         # here we go again
 }  }
   
 sub USRMAN {  sub USRMAN {
     %childatt=();  
     &logthis("USR1: Trying to establish connections again");      &logthis("USR1: Trying to establish connections again");
     foreach $thisserver (keys %hostip) {      foreach $thisserver (keys %hostip) {
  $answer=subreply("ping",$thisserver);   $answer=subreply("ping",$thisserver);
         &logthis(          &logthis("USR1: Ping $thisserver "
           "USR1: Ping $thisserver (pid >$childpid{$thisserver}<): >$answer<");          ."(pid >$childpid{$thisserver}<, $childatt{thisserver} attempts): "
           ." >$answer<");
     }      }
       %childatt=();
 }  }
   
 # -------------------------------------------------- Non-critical communication  # -------------------------------------------------- Non-critical communication
 sub subreply {   sub subreply { 
  my ($cmd,$server)=@_;   my ($cmd,$server)=@_;
    my $answer='';
  if ($server ne $perlvar{'lonHostID'}) {    if ($server ne $perlvar{'lonHostID'}) { 
     my $peerfile="$perlvar{'lonSockDir'}/$server";      my $peerfile="$perlvar{'lonSockDir'}/$server";
     my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",      my $sclient=IO::Socket::UNIX->new(Peer    =>"$peerfile",
Line 136  sub logperm { Line 161  sub logperm {
   
 $fpid=fork;  $fpid=fork;
 exit if $fpid;  exit if $fpid;
 die "Couldn't fork: $!" unless defined ($fpid);  catchdie "Couldn't fork: $!" unless defined ($fpid);
   
 POSIX::setsid() or die "Can't start new session: $!";  POSIX::setsid() or catchdie "Can't start new session: $!";
   
 # ------------------------------------------------------- Write our PID on disk  # ------------------------------------------------------- Write our PID on disk
   
Line 146  $execdir=$perlvar{'lonDaemons'}; Line 171  $execdir=$perlvar{'lonDaemons'};
 open (PIDSAVE,">$execdir/logs/lonc.pid");  open (PIDSAVE,">$execdir/logs/lonc.pid");
 print PIDSAVE "$$\n";  print PIDSAVE "$$\n";
 close(PIDSAVE);  close(PIDSAVE);
 &logthis("---------- Starting ----------");  &logthis("<font color=red>CRITICAL: ---------- Starting ----------</font>");
   
 # ----------------------------- Ignore signals generated during initial startup  # ----------------------------- Ignore signals generated during initial startup
 $SIG{HUP}=$SIG{USR1}='IGNORE';  $SIG{HUP}=$SIG{USR1}='IGNORE';
Line 172  while (1) { Line 197  while (1) {
                                     # See who died and start new one                                      # See who died and start new one
     foreach $thisserver (keys %hostip) {      foreach $thisserver (keys %hostip) {
         if (!$childpid{$thisserver}) {          if (!$childpid{$thisserver}) {
     if ($childatt{$thisserver}<5) {      if ($childatt{$thisserver}<=$childmaxattempts) {
          $childatt{$thisserver}++;
                  &logthis(
      "<font color=yellow>INFO: Trying to reconnect for $thisserver "
     ."($childatt{$thisserver} of $childmaxattempts attempts)</font>"); 
                make_new_child($thisserver);                 make_new_child($thisserver);
                $childatt{$thisserver}++;  
     }      }
         }                 }       
     }      }
Line 190  sub make_new_child { Line 218  sub make_new_child {
     # block signal for fork      # block signal for fork
     $sigset = POSIX::SigSet->new(SIGINT);      $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset)      sigprocmask(SIG_BLOCK, $sigset)
         or die "Can't block SIGINT for fork: $!\n";          or catchdie "Can't block SIGINT for fork: $!\n";
           
     die "fork: $!" unless defined ($pid = fork);      catchdie "fork: $!" unless defined ($pid = fork);
           
     if ($pid) {      if ($pid) {
         # Parent records the child's birth and returns.          # Parent records the child's birth and returns.
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or catchdie "Can't unblock SIGINT for fork: $!\n";
         $children{$pid} = $conserver;          $children{$pid} = $conserver;
         $childpid{$conserver} = $pid;          $childpid{$conserver} = $pid;
         return;          return;
Line 207  sub make_new_child { Line 235  sub make_new_child {
           
         # unblock signals          # unblock signals
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
             or die "Can't unblock SIGINT for fork: $!\n";              or catchdie "Can't unblock SIGINT for fork: $!\n";
   
 # ----------------------------- This is the modified main program of non-forker  # ----------------------------- This is the modified main program of non-forker
   
Line 220  unless ( Line 248  unless (
                                       PeerPort => $perlvar{'londPort'},                                        PeerPort => $perlvar{'londPort'},
                                       Proto    => "tcp",                                        Proto    => "tcp",
                                       Type     => SOCK_STREAM)                                        Type     => SOCK_STREAM)
    ) { &logthis("Couldn't connect $conserver: $@");     ) { 
        sleep(5);         my $st=120+int(rand(240));
          &logthis(
   "<font color=blue>WARNING: Couldn't connect $conserver ($st secs): $@</font>");
          sleep($st);
        exit;          exit; 
      };       };
 # --------------------------------------- Send a ping to make other end do USR1  # --------------------------------------- Send a ping to make other end do USR1
Line 250  my $cipherkey=pack("H32",$key); Line 281  my $cipherkey=pack("H32",$key);
 if ($cipher=new IDEA $cipherkey) {  if ($cipher=new IDEA $cipherkey) {
    &logthis("Secure connection inititalized: $conserver");     &logthis("Secure connection inititalized: $conserver");
 } else {  } else {
    &logthis("Error: Could not establish secure connection, $conserver!");     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  # ----------------------------------------- We're online, send delayed messages
   
       my @allbuffered;
     my $path="$perlvar{'lonSockDir'}/delayed";      my $path="$perlvar{'lonSockDir'}/delayed";
       opendir(DIRHANDLE,$path);
       @allbuffered=grep /\.$conserver$/, readdir DIRHANDLE;
       closedir(DIRHANDLE);
     my $dfname;      my $dfname;
     while ($dfname=<$path/*.$conserver>) {      map {
           $dfname="$path/$_";
           &logthis($dfname);
         my $wcmd;          my $wcmd;
         {          {
          my $dfh=IO::File->new($dfname);           my $dfh=IO::File->new($dfname);
          $wcmd=<$dfh>;           $cmd=<$dfh>;
         }          }
         my ($server,$cmd)=split(/:/,$wcmd);  
         chomp($cmd);          chomp($cmd);
         my $bcmd=$cmd;          my $bcmd=$cmd;
         if ($cmd =~ /^encrypt\:/) {          if ($cmd =~ /^encrypt\:/) {
Line 285  if ($cipher=new IDEA $cipherkey) { Line 326  if ($cipher=new IDEA $cipherkey) {
  chomp($answer);   chomp($answer);
         if ($answer ne '') {          if ($answer ne '') {
     unlink("$dfname");      unlink("$dfname");
             &logthis("Delayed $cmd to $conserver ($server): >$answer<");              &logthis("Delayed $cmd to $conserver: >$answer<");
             &logperm("S:$conserver:$bcmd");              &logperm("S:$conserver:$bcmd");
         }                  }        
     }      } @allbuffered;
   
 # ------------------------------------------------------- Listen to UNIX socket  # ------------------------------------------------------- Listen to UNIX socket
 unless (  unless (
   $server = IO::Socket::UNIX->new(Local  => $port,    $server = IO::Socket::UNIX->new(Local  => $port,
                                   Type   => SOCK_STREAM,                                    Type   => SOCK_STREAM,
                                   Listen => 10 )                                    Listen => 10 )
    ) { &logthis("Can't make server socket $conserver: $@");     ) { 
        sleep(5);         my $st=120+int(rand(240));
          &logthis(
            "<font color=blue>WARNING: ".
            "Can't make server socket $conserver ($st secs): $@</font>");
          sleep($st);
        exit;          exit; 
      };       };
   
 # -----------------------------------------------------------------------------  # -----------------------------------------------------------------------------
   
   &logthis("<font color=green>$conserver online</font>");
   
   # -----------------------------------------------------------------------------
 # begin with empty buffers  # begin with empty buffers
 %inbuffer  = ();  %inbuffer  = ();
 %outbuffer = ();  %outbuffer = ();
Line 454  sub nonblock { Line 502  sub nonblock {
   
           
     $flags = fcntl($socket, F_GETFL, 0)      $flags = fcntl($socket, F_GETFL, 0)
             or die "Can't get flags for socket: $!\n";              or catchdie "Can't get flags for socket: $!\n";
     fcntl($socket, F_SETFL, $flags | O_NONBLOCK)      fcntl($socket, F_SETFL, $flags | O_NONBLOCK)
             or die "Can't make socket nonblocking: $!\n";              or catchdie "Can't make socket nonblocking: $!\n";
 }  }
   
   # grabs exception and records it to log before exiting
   sub catchexception {
       my ($signal)=@_;
       &logthis("<font color=red>CRITICAL: "
        ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
        ."$signal with this parameter->[$@]</font>");
       die($@);
   }
   
   # grabs exception and records it to log before exiting
   # NOTE: we must NOT use the regular (non-overrided) die function in
   # the code because a handler CANNOT be attached to it
   # (despite what some of the documentation says about SIG{__DIE__}.
   sub catchdie {
       my ($message)=@_;
       &logthis("<font color=red>CRITICAL: "
        ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
        ."\_\_DIE\_\_ with this parameter->[$message]</font>");
       die($message);
   }
   
Removed from v.1.3  
changed lines
  Added in v.1.8

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