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Diff for /loncom/loncnew between versions 1.51 and 1.107

version 1.51, 2004/08/26 12:35:10 version 1.107, 2018/12/10 17:34:22
Line 26 Line 26
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
 #  #
 # new lonc handles n request out bver m connections to londs.  # new lonc handles n request out over m connections to londs.
 # This module is based on the Event class.  # This module is based on the Event class.
 #   Development iterations:  #   Development iterations:
 #    - Setup basic event loop.   (done)  #    - Setup basic event loop.   (done)
Line 60  use LONCAPA::Stack; Line 60  use LONCAPA::Stack;
 use LONCAPA::LondConnection;  use LONCAPA::LondConnection;
 use LONCAPA::LondTransaction;  use LONCAPA::LondTransaction;
 use LONCAPA::Configuration;  use LONCAPA::Configuration;
 use LONCAPA::HashIterator;  use Fcntl qw(:flock);
   
   
 # Read the httpd configuration file to get perl variables  # Read the httpd configuration file to get perl variables
Line 72  my %perlvar    = %{$perlvarref}; Line 72  my %perlvar    = %{$perlvarref};
 #  #
 #  parent and shared variables.  #  parent and shared variables.
   
 my %ChildHash; # by pid -> host.  my %ChildPid; # by pid -> host.
 my %HostToPid; # By host -> pid.  my %ChildHost; # by host.
 my %HostHash; # by loncapaname -> IP.  my %ChildKeyMode;               # by pid -> keymode
   my %listening_to; # Socket->host table for who the parent
                                   # is listening to.
   my %parent_dispatchers;         # host-> listener watcher events. 
   
   my %parent_handlers; # Parent signal handlers...
   
 my $MaxConnectionCount = 10; # Will get from config later.  my $MaxConnectionCount = 10; # Will get from config later.
 my $ClientConnection = 0; # Uniquifier for client events.  my $ClientConnection = 0; # Uniquifier for client events.
   
 my $DebugLevel = 0;  my $DebugLevel = 0;
 my $NextDebugLevel= 2; # So Sigint can toggle this.  my $NextDebugLevel= 2; # So Sigint can toggle this.
 my $IdleTimeout= 600; # Wait 10 minutes before pruning connections.  my $IdleTimeout= 5*60; # Seconds to wait prior to pruning connections.
   
 my $LogTransactions = 0; # When True, all transactions/replies get logged.  my $LogTransactions = 0; # When True, all transactions/replies get logged.
   my $executable      = $0; # Get the full path to me.
   
 #  #
 #  The variables below are only used by the child processes.  #  The variables below are only used by the child processes.
 #  #
 my $RemoteHost; # Name of host child is talking to.  my $RemoteHost; # Hostname of host child is talking to.
   my $RemoteHostId; # lonid of host child is talking to.
   my $RemoteDefHostId; # default lonhostID of host child is talking to.
   my @all_host_ids;
 my $UnixSocketDir= $perlvar{'lonSockDir'};  my $UnixSocketDir= $perlvar{'lonSockDir'};
 my $IdleConnections = Stack->new(); # Set of idle connections  my $IdleConnections = Stack->new(); # Set of idle connections
 my %ActiveConnections; # Connections to the remote lond.  my %ActiveConnections; # Connections to the remote lond.
Line 100  my $ConnectionCount = 0; Line 108  my $ConnectionCount = 0;
 my $IdleSeconds     = 0; # Number of seconds idle.  my $IdleSeconds     = 0; # Number of seconds idle.
 my $Status          = ""; # Current status string.  my $Status          = ""; # Current status string.
 my $RecentLogEntry  = "";  my $RecentLogEntry  = "";
 my $ConnectionRetries=2; # Number of connection retries allowed.  my $ConnectionRetries=5; # Number of connection retries allowed.
 my $ConnectionRetriesLeft=2; # Number of connection retries remaining.  my $ConnectionRetriesLeft=5; # Number of connection retries remaining.
 my $LondVersion     = "unknown"; # Version of lond we talk with.  my $LondVersion     = "unknown"; # Version of lond we talk with.
 my $KeyMode         = "";       # e.g. ssl, local, insecure from last connect.  my $KeyMode         = "";       # e.g. ssl, local, insecure from last connect.
   my $LondConnecting  = 0;       # True when a connection is being built.
   
   
   
   my $I_am_child      = 0; # True if this is the child process.
   
 my $LongTickLength  = 10000000; #Tick Frequency when Idle  
 my $ShortTickLength = 1;        #Tick Frequency when Active (many places in  
                                 # the code assume this is one)  
 my $TickLength      = $ShortTickLength;#number of seconds to wait until ticking  
 #  #
 #   The hash below gives the HTML format for log messages  #   The hash below gives the HTML format for log messages
 #   given a severity.  #   given a severity.
Line 122  $LogFormats{"WARNING"}  = "<font color=' Line 131  $LogFormats{"WARNING"}  = "<font color='
 $LogFormats{"DEFAULT"}  = " %s ";  $LogFormats{"DEFAULT"}  = " %s ";
   
   
   #  UpdateStatus;
   #    Update the idle status display to show how many connections
   #    are left, retries and other stuff.
   #
   sub UpdateStatus {
       if ($ConnectionRetriesLeft > 0) {
    ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount
      ." Retries remaining: ".$ConnectionRetriesLeft
      ." ($KeyMode)");
       } else {
    ShowStatus(GetServerHost()." >> DEAD <<");
       }
   }
   
   
 =pod  =pod
   
Line 130  $LogFormats{"DEFAULT"}  = " %s "; Line 153  $LogFormats{"DEFAULT"}  = " %s ";
 Makes an entry into the permanent log file.  Makes an entry into the permanent log file.
   
 =cut  =cut
   
 sub LogPerm {  sub LogPerm {
     my $message=shift;      my $message=shift;
     my $execdir=$perlvar{'lonDaemons'};      my $execdir=$perlvar{'lonDaemons'};
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");      my $fh=IO::File->new(">>$execdir/logs/lonnet.perm.log");
       chomp($message);
     print $fh "$now:$message:$local\n";      print $fh "$now:$message:$local\n";
 }  }
   
Line 175  sub Log { Line 200  sub Log {
     my $now   = time;      my $now   = time;
     my $local = localtime($now);      my $local = localtime($now);
     my $finalformat = "$local ($$) [$RemoteHost] [$Status] ";      my $finalformat = "$local ($$) [$RemoteHost] [$Status] ";
     my $finalformat = $finalformat.$format."\n";      $finalformat = $finalformat.$format."\n";
   
     # open the file and put the result.      # open the file and put the result.
   
Line 249  sub SocketDump { Line 274  sub SocketDump {
  and as what we return in a SIGUSR1   and as what we return in a SIGUSR1
   
 =cut  =cut
   
 sub ShowStatus {  sub ShowStatus {
     my $state = shift;      my $state = shift;
     my $now = time;      my $now = time;
Line 259  sub ShowStatus { Line 285  sub ShowStatus {
   
 =pod  =pod
   
 =head 2 SocketTimeout  =head2 SocketTimeout
   
     Called when an action on the socket times out.  The socket is       Called when an action on the socket times out.  The socket is 
    destroyed and any active transaction is failed.     destroyed and any active transaction is failed.
   
   
 =cut  =cut
   
 sub SocketTimeout {  sub SocketTimeout {
     my $Socket = shift;      my $Socket = shift;
     Log("WARNING", "A socket timeout was detected");      Log("WARNING", "A socket timeout was detected");
     Debug(0, " SocketTimeout called: ");      Debug(5, " SocketTimeout called: ");
     $Socket->Dump(0);      $Socket->Dump(0);
     if(exists($ActiveTransactions{$Socket})) {      if(exists($ActiveTransactions{$Socket})) {
  FailTransaction($ActiveTransactions{$Socket});   FailTransaction($ActiveTransactions{$Socket});
Line 278  sub SocketTimeout { Line 305  sub SocketTimeout {
                                 # a connection failure:                                  # a connection failure:
     $ConnectionRetriesLeft--;      $ConnectionRetriesLeft--;
     if($ConnectionRetriesLeft <= 0) {      if($ConnectionRetriesLeft <= 0) {
  Log("CRITICAL", "Host marked dead: ".GetServerHost());   Log("CRITICAL", "Host marked DEAD: ".GetServerHost());
    $LondConnecting = 0;
     }      }
   
 }  }
   
   #
   #   This function should be called by the child in all cases where it must
   #   exit.  The child process must create a lock file for the AF_UNIX socket
   #   in order to prevent connection requests from lonnet in the time between
   #   process exit and the parent picking up the listen again.
   #
   # Parameters:
   #     exit_code           - Exit status value, however see the next parameter.
   #     message             - If this optional parameter is supplied, the exit
   #                           is via a die with this message.
   #
   sub child_exit {
       my ($exit_code, $message) = @_;
   
       # Regardless of how we exit, we may need to do the lock thing:
   
       #
       #  Create a lock file since there will be a time window
       #  between our exit and the parent's picking up the listen
       #  during which no listens will be done on the
       #  lonnet client socket.
       #
       my $lock_file = &GetLoncSocketPath().".lock";
       open(LOCK,">$lock_file");
       print LOCK "Contents not important";
       close(LOCK);
       unlink(&GetLoncSocketPath());
   
       if ($message) {
    die($message);
       } else {
    exit($exit_code);
       }
   }
 #----------------------------- Timer management ------------------------  #----------------------------- Timer management ------------------------
   
 =pod  =pod
   
 =head2 Tick  =head2 Tick
   
 Invoked  each timer tick.  Invoked each timer tick.
   
 =cut  =cut
   
   
 sub Tick {  sub Tick {
       my ($Event)       = @_;
       my $clock_watcher = $Event->w;
   
     my $client;      my $client;
     if($ConnectionRetriesLeft > 0) {      UpdateStatus();
  ShowStatus(GetServerHost()." Connection count: ".$ConnectionCount  
    ." Retries remaining: ".$ConnectionRetriesLeft  
    ." ($KeyMode)");  
     } else {  
  ShowStatus(GetServerHost()." >> DEAD <<");  
     }  
     # Is it time to prune connection count:      # Is it time to prune connection count:
   
   
     if($IdleConnections->Count()  &&       if($IdleConnections->Count()  && 
        ($WorkQueue->Count() == 0)) { # Idle connections and nothing to do?         ($WorkQueue->Count() == 0)) { # Idle connections and nothing to do?
  $IdleSeconds+=$TickLength;   $IdleSeconds++;
  if($IdleSeconds > $IdleTimeout) { # Prune a connection...   if($IdleSeconds > $IdleTimeout) { # Prune a connection...
     my $Socket = $IdleConnections->pop();      my $Socket = $IdleConnections->pop();
     KillSocket($Socket);      KillSocket($Socket);
     if ($IdleConnections->Count() == 0) {      $IdleSeconds = 0; # Otherwise all connections get trimmed to fast.
  &SetupTimer($LongTickLength);      UpdateStatus();
       if(($ConnectionCount == 0)) {
    &child_exit(0);
   
     }      }
  }   }
     } else {      } else {
Line 332  sub Tick { Line 396  sub Tick {
     # Do we have work in the queue, but no connections to service them?      # Do we have work in the queue, but no connections to service them?
     # If so, try to make some new connections to get things going again.      # If so, try to make some new connections to get things going again.
     #      #
           #   Note this code is dead now...
       #
     my $Requests = $WorkQueue->Count();      my $Requests = $WorkQueue->Count();
     if (($ConnectionCount == 0)  && ($Requests > 0)) {       if (($ConnectionCount == 0)  && ($Requests > 0) && (!$LondConnecting)) { 
  if ($ConnectionRetriesLeft > 0) {   if ($ConnectionRetriesLeft > 0) {
     my $Connections = ($Requests <= $MaxConnectionCount) ?      Debug(5,"Work but no connections, Make a new one");
  $Requests : $MaxConnectionCount;      my $success;
     Debug(5,"Work but no connections, start ".$Connections." of them");      $success    = &MakeLondConnection;
     my $successCount = 0;      if($success == 0) { # All connections failed:
     for (my $i =0; $i < $Connections; $i++) {  
  $successCount += MakeLondConnection();  
     }  
     if($successCount == 0) { # All connections failed:  
  Debug(5,"Work in queue failed to make any connectiouns\n");   Debug(5,"Work in queue failed to make any connectiouns\n");
  EmptyQueue(); # Fail pending transactions with con_lost.   EmptyQueue(); # Fail pending transactions with con_lost.
  CloseAllLondConnections(); # Should all be closed but....   CloseAllLondConnections(); # Should all be closed but....
     }      }
  } else {   } else {
       $LondConnecting = 0;
     ShowStatus(GetServerHost()." >>> DEAD!!! <<<");      ShowStatus(GetServerHost()." >>> DEAD!!! <<<");
     Debug(5,"Work in queue, but gave up on connections..flushing\n");      Debug(5,"Work in queue, but gave up on connections..flushing\n");
     EmptyQueue(); # Connections can't be established.      EmptyQueue(); # Connections can't be established.
Line 358  sub Tick { Line 420  sub Tick {
     }      }
     if ($ConnectionCount == 0) {      if ($ConnectionCount == 0) {
  $KeyMode = "";    $KeyMode = ""; 
    $clock_watcher->cancel();
     }      }
       &UpdateStatus();
 }  }
   
 =pod  =pod
Line 377  Trigger disconnections of idle sockets. Line 441  Trigger disconnections of idle sockets.
   
 =cut  =cut
   
 my $timer;  
 sub SetupTimer {  sub SetupTimer {
     my ($newLength)=@_;      Debug(6, "SetupTimer");
     Debug(6, "SetupTimer $TickLength->$newLength");      Event->timer(interval => 1, cb => \&Tick,
     $TickLength=$newLength;   hard => 1);
     if ($timer) { $timer->cancel; }  
     $timer=Event->timer(interval => $TickLength, cb => \&Tick );  
 }  }
   
 =pod  =pod
Line 429  sub ServerToIdle { Line 490  sub ServerToIdle {
   
 Event callback for when a client socket is writable.  Event callback for when a client socket is writable.
   
 This callback is established when a transaction reponse is  This callback is established when a transaction response is
 avaiable from lond.  The response is forwarded to the unix socket  available from lond.  The response is forwarded to the unix socket
 as it becomes writable in this sub.  as it becomes writable in this sub.
   
 Parameters:  Parameters:
Line 445  the data and Event->w->fd is the socket Line 506  the data and Event->w->fd is the socket
 sub ClientWritable {  sub ClientWritable {
     my $Event    = shift;      my $Event    = shift;
     my $Watcher  = $Event->w;      my $Watcher  = $Event->w;
       if (!defined($Watcher)) {
    &child_exit(-1,'No watcher for event in ClientWritable');
       }
     my $Data     = $Watcher->data;      my $Data     = $Watcher->data;
     my $Socket   = $Watcher->fd;      my $Socket   = $Watcher->fd;
   
Line 483  sub ClientWritable { Line 547  sub ClientWritable {
     } else { # Partial string sent.      } else { # Partial string sent.
  $Watcher->data(substr($Data, $result));   $Watcher->data(substr($Data, $result));
  if($result == 0) {    # client hung up on us!!   if($result == 0) {    # client hung up on us!!
     Log("INFO", "lonc pipe client hung up on us!");      # Log("INFO", "lonc pipe client hung up on us!");
     $Watcher->cancel;      $Watcher->cancel;
     $Socket->shutdown(2);      $Socket->shutdown(2);
     $Socket->close();      $Socket->close();
Line 497  sub ClientWritable { Line 561  sub ClientWritable {
     if($errno == POSIX::EWOULDBLOCK   ||      if($errno == POSIX::EWOULDBLOCK   ||
        $errno == POSIX::EAGAIN        ||         $errno == POSIX::EAGAIN        ||
        $errno == POSIX::EINTR) {         $errno == POSIX::EINTR) {
  # No action taken?   # No action taken...the socket will be writable firing the event again
    # which will result in a retry of the write.
     } else { # Unanticipated errno.      } else { # Unanticipated errno.
  &Debug(5,"ClientWritable error or peer shutdown".$RemoteHost);   &Debug(5,"ClientWritable error or peer shutdown".$RemoteHost);
  $Watcher->cancel; # Stop the watcher.   $Watcher->cancel; # Stop the watcher.
Line 508  sub ClientWritable { Line 573  sub ClientWritable {
  }   }
     } else {      } else {
  $Watcher->cancel(); # A delayed request...just cancel.   $Watcher->cancel(); # A delayed request...just cancel.
    return;
     }      }
 }  }
   
Line 525  Parameters: Line 591  Parameters:
   
 =item Socket  =item Socket
   
 Socket on which the lond transaction occured.  This is a  Socket on which the lond transaction occurred.  This is a
 LondConnection. The data received is in the TransactionReply member.  LondConnection. The data received are in the TransactionReply member.
   
 =item Transaction  =item Transaction
   
Line 547  sub CompleteTransaction { Line 613  sub CompleteTransaction {
  StartClientReply($Transaction, $data);   StartClientReply($Transaction, $data);
     } else { # Delete deferred transaction file.      } else { # Delete deferred transaction file.
  Log("SUCCESS", "A delayed transaction was completed");   Log("SUCCESS", "A delayed transaction was completed");
  LogPerm("S:$Transaction->getClient() :".$Transaction->getRequest());   LogPerm("S:".$Socket->PeerLoncapaHim().":".$Transaction->getRequest());
  unlink $Transaction->getFile();   unlink($Transaction->getFile());
     }      }
 }  }
   
Line 566  sub CompleteTransaction { Line 632  sub CompleteTransaction {
   
 =item data  =item data
   
     The data to send to apached client.      The data to send to apache client.
   
 =cut  =cut
   
Line 611  Parameters: Line 677  Parameters:
   
 sub FailTransaction {  sub FailTransaction {
     my $transaction = shift;      my $transaction = shift;
     Log("WARNING", "Failing transaction ".$transaction->getRequest());      
     Debug(1, "Failing transaction: ".$transaction->getRequest());      #  If the socket is dead, that's already logged.
   
       if ($ConnectionRetriesLeft > 0) {
    Log("WARNING", "Failing transaction "
       .$transaction->getLoggableRequest());
       }
       Debug(1, "Failing transaction: ".$transaction->getLoggableRequest());
     if (!$transaction->isDeferred()) { # If the transaction is deferred we'll get to it.      if (!$transaction->isDeferred()) { # If the transaction is deferred we'll get to it.
  my $client  = $transaction->getClient();   my $client  = $transaction->getClient();
  Debug(1," Replying con_lost to ".$transaction->getRequest());   Debug(1," Replying con_lost to ".$transaction->getRequest());
Line 622  sub FailTransaction { Line 694  sub FailTransaction {
 }  }
   
 =pod  =pod
   
 =head1  EmptyQueue  =head1  EmptyQueue
   
   Fails all items in the work queue with con_lost.    Fails all items in the work queue with con_lost.
   Note that each item in the work queue is a transaction.    Note that each item in the work queue is a transaction.
   
 =cut  =cut
   
 sub EmptyQueue {  sub EmptyQueue {
     $ConnectionRetriesLeft--; # Counts as connection failure too.      $ConnectionRetriesLeft--; # Counts as connection failure too.
     while($WorkQueue->Count()) {      while($WorkQueue->Count()) {
Line 643  sub EmptyQueue { Line 717  sub EmptyQueue {
 Close all connections open on lond prior to exit e.g.  Close all connections open on lond prior to exit e.g.
   
 =cut  =cut
   
 sub CloseAllLondConnections {  sub CloseAllLondConnections {
     foreach my $Socket (keys %ActiveConnections) {      foreach my $Socket (keys %ActiveConnections) {
       if(exists($ActiveTransactions{$Socket})) {        if(exists($ActiveTransactions{$Socket})) {
Line 651  sub CloseAllLondConnections { Line 726  sub CloseAllLondConnections {
       KillSocket($Socket);        KillSocket($Socket);
     }      }
 }  }
 =cut  
   
 =pod  =pod
   
Line 669  Parameters: Line 743  Parameters:
     
   The socket to kill off.    The socket to kill off.
   
 =item Restart  =item restart
   
 nonzero if we are allowed to create a new connection.  
   
   non-zero if we are allowed to create a new connection.
   
 =cut  =cut
   
 sub KillSocket {  sub KillSocket {
     my $Socket = shift;      my $Socket = shift;
       my $restart = shift;
   
     Log("WARNING", "Shutting down a socket");      Log("WARNING", "Shutting down a socket");
     $Socket->Shutdown();      $Socket->Shutdown();
Line 691  sub KillSocket { Line 766  sub KillSocket {
  delete ($ActiveTransactions{$Socket});   delete ($ActiveTransactions{$Socket});
     }      }
     if(exists($ActiveConnections{$Socket})) {      if(exists($ActiveConnections{$Socket})) {
    $ActiveConnections{$Socket}->cancel;
  delete($ActiveConnections{$Socket});   delete($ActiveConnections{$Socket});
  $ConnectionCount--;          # Decrement ConnectionCount unless we will immediately
           # re-connect (i.e., $restart is true), because this was
           # a connection where the SSL channel for exchange of the
           # shared key failed, and we may use an insecure channel.
           unless ($restart) {
       $ConnectionCount--;
           }
  if ($ConnectionCount < 0) { $ConnectionCount = 0; }   if ($ConnectionCount < 0) { $ConnectionCount = 0; }
     }      }
     #  If the connection count has gone to zero and there is work in the      #  If the connection count has gone to zero and there is work in the
     #  work queue, the work all gets failed with con_lost.      #  work queue, the work all gets failed with con_lost.
     #      #
     
     if($ConnectionCount == 0) {      if($ConnectionCount == 0) {
    $LondConnecting = 0; # No connections so also not connecting.
  EmptyQueue();   EmptyQueue();
  CloseAllLondConnections; # Should all already be closed but...   CloseAllLondConnections(); # Should all already be closed but...
           &clear_childpid($$);
     }      }
       UpdateStatus();
 }  }
   
 =pod  =pod
Line 713  is readable.  The action is state depend Line 799  is readable.  The action is state depend
   
 =head3 State=Initialized  =head3 State=Initialized
   
 We''re waiting for the challenge, this is a no-op until the  We are waiting for the challenge, this is a no-op until the
 state changes.  state changes.
   
 =head3 State=Challenged   =head3 State=Challenged 
Line 723  The connection must echo the challenge b Line 809  The connection must echo the challenge b
   
 =head3 State=ChallengeReplied  =head3 State=ChallengeReplied
   
 The challenge has been replied to.  The we are receiveing the   The challenge has been replied to.  Then we are receiving the 
 'ok' from the partner.  'ok' from the partner.
   
 =head3  State=ReadingVersionString  =head3  State=ReadingVersionString
Line 749  The the key has been requested, now we a Line 835  The the key has been requested, now we a
 =head3 State=Idle   =head3 State=Idle 
   
 The encryption key has been negotiated or we have finished   The encryption key has been negotiated or we have finished 
 reading data from the a transaction.   If the callback data has  reading data from the a transaction.   If the callback data have
 a client as well as the socket iformation, then we are   a client as well as the socket information, then we are 
 doing a transaction and the data received is relayed to the client  doing a transaction and the data received are relayed to the client
 before the socket is put on the idle list.  before the socket is put on the idle list.
   
 =head3 State=SendingRequest  =head3 State=SendingRequest
Line 768  to readable to receive the reply. Line 854  to readable to receive the reply.
 The parameter to this function are:  The parameter to this function are:
   
 The event. Implicit in this is the watcher and its data.  The data   The event. Implicit in this is the watcher and its data.  The data 
 contains at least the lond connection object and, if a   contain at least the lond connection object and, if a 
 transaction is in progress, the socket attached to the local client.  transaction is in progress, the socket attached to the local client.
   
 =cut  =cut
Line 796  sub LondReadable { Line 882  sub LondReadable {
   
  Log("WARNING",   Log("WARNING",
     "Lond connection lost.");      "Lond connection lost.");
           my $state_on_exit = $Socket->GetState();
  if(exists($ActiveTransactions{$Socket})) {   if(exists($ActiveTransactions{$Socket})) {
     FailTransaction($ActiveTransactions{$Socket});      FailTransaction($ActiveTransactions{$Socket});
    } else {
       #  Socket is connecting and failed... need to mark
       #  no longer connecting.
       $LondConnecting = 0;
  }   }
  $Watcher->cancel();   $Watcher->cancel();
  KillSocket($Socket);          if ($state_on_exit eq 'ReInitNoSSL') {
  $ConnectionRetriesLeft--;       # Counts as connection failure              # SSL certificate verification failed, and insecure connection
               # allowed. Send restart arg to KillSocket(), so EmptyQueue() 
               # is not called, as we still hope to process queued request.
   
               KillSocket($Socket,1);
   
               # Re-initiate creation of Lond Connection for use with queued
               # request.
   
               ShowStatus("Connected to ".$RemoteHost);
               Log("WARNING","No SSL channel (verification failed), will try with insecure channel");
               &MakeLondConnection(1);
   
           } else {
       KillSocket($Socket);
       $ConnectionRetriesLeft--;       # Counts as connection failure         
           }
  return;   return;
     }      }
     SocketDump(6,$Socket);      SocketDump(6,$Socket);
Line 812  sub LondReadable { Line 919  sub LondReadable {
     if($State eq "Initialized") {      if($State eq "Initialized") {
   
   
       } elsif ($State eq "ReInitNoSSL") {
   
     } elsif ($State eq "ChallengeReceived") {      } elsif ($State eq "ChallengeReceived") {
  #  The challenge must be echoed back;  The state machine   #  The challenge must be echoed back;  The state machine
  # in the connection takes care of setting that up.  Just   # in the connection takes care of setting that up.  Just
Line 848  sub LondReadable { Line 957  sub LondReadable {
     } elsif ($State eq "ReceivingKey") {      } elsif ($State eq "ReceivingKey") {
   
     } elsif ($State eq "Idle") {      } elsif ($State eq "Idle") {
      
           if ($ConnectionCount == 1) { 
               # Write child Pid file to keep track of ssl and insecure
               # connections
   
               &record_childpid($Socket);
           }
   
  # This is as good a spot as any to get the peer version   # This is as good a spot as any to get the peer version
  # string:   # string:
         
Line 868  sub LondReadable { Line 984  sub LondReadable {
     CompleteTransaction($Socket,       CompleteTransaction($Socket, 
  $ActiveTransactions{$Socket});   $ActiveTransactions{$Socket});
  } else {   } else {
     Log("SUCCESS", "Connection ".$ConnectionCount." to "      my $count = $Socket->GetClientData();
       Log("SUCCESS", "Connection ".$count." to "
  .$RemoteHost." now ready for action");   .$RemoteHost." now ready for action");
  }   }
  ServerToIdle($Socket); # Next work unit or idle.   ServerToIdle($Socket); # Next work unit or idle.
   
    #
    $LondConnecting = 0; # Best spot I can think of for this.
    # 
   
     } elsif ($State eq "SendingRequest") {      } elsif ($State eq "SendingRequest") {
  #  We need to be writable for this and probably don't belong   #  We need to be writable for this and probably don't belong
  #  here inthe first place.   #  here inthe first place.
   
  Deubg(6, "SendingRequest state encountered in readable");   Debug(6, "SendingRequest state encountered in readable");
  $Watcher->poll("w");   $Watcher->poll("w");
  $Watcher->cb(\&LondWritable);   $Watcher->cb(\&LondWritable);
   
Line 901  event.  The action taken is very state d Line 1022  event.  The action taken is very state d
 =head3 State = Connected   =head3 State = Connected 
   
 The connection is in the process of sending the 'init' hailing to the  The connection is in the process of sending the 'init' hailing to the
 lond on the remote end.  The connection object''s Writable member is  lond on the remote end.  The Writable member of the connection object
 called.  On error, ConnectionError is called to destroy the connection  is called.  On error, call ConnectionError to destroy the connection
 and remove it from the ActiveConnections hash  and remove it from the ActiveConnections hash.
   
 =head3 Initialized  =head3 Initialized
   
Line 985  sub LondWritable { Line 1106  sub LondWritable {
     " has been disconnected");      " has been disconnected");
  if(exists($ActiveTransactions{$Socket})) {   if(exists($ActiveTransactions{$Socket})) {
     FailTransaction($ActiveTransactions{$Socket});      FailTransaction($ActiveTransactions{$Socket});
    } else {
       #  In the process of conneting, so need to turn that off.
       
       $LondConnecting = 0;
  }   }
  $Watcher->cancel();   $Watcher->cancel();
  KillSocket($Socket);   KillSocket($Socket);
Line 1004  sub LondWritable { Line 1129  sub LondWritable {
   
  $Watcher->cb(\&LondReadable);   $Watcher->cb(\&LondReadable);
  $Watcher->poll("r");   $Watcher->poll("r");
   
       } elsif ($State eq "ReInitNoSSL") {
   
     } elsif ($State eq "ChallengeReceived") {      } elsif ($State eq "ChallengeReceived") {
  # We received the challenge, now we    # We received the challenge, now we 
  # are echoing it back. This is a no-op,   # are echoing it back. This is a no-op,
Line 1071  sub LondWritable { Line 1198  sub LondWritable {
     }      }
           
 }  }
   
 =pod  =pod
           
 =cut  =cut
   
   
 sub QueueDelayed {  sub QueueDelayed {
     Debug(3,"QueueDelayed called");      Debug(3,"QueueDelayed called");
   
Line 1081  sub QueueDelayed { Line 1211  sub QueueDelayed {
   
     Debug(4, "Delayed path: ".$path);      Debug(4, "Delayed path: ".$path);
     opendir(DIRHANDLE, $path);      opendir(DIRHANDLE, $path);
       
     my @alldelayed = grep /\.$RemoteHost$/, readdir DIRHANDLE;      my $host_id_re = '(?:'.join('|',map {quotemeta($_)} (@all_host_ids)).')';
       my @alldelayed = grep(/\.$host_id_re$/, readdir(DIRHANDLE));
     closedir(DIRHANDLE);      closedir(DIRHANDLE);
     my $dfname;      foreach my $dfname (sort(@alldelayed)) {
     my $reqfile;   my $reqfile = "$path/$dfname";
     foreach $dfname (sort  @alldelayed) {   my ($host_id) = ($dfname =~ /\.([^.]*)$/);
  $reqfile = "$path/$dfname";   Debug(4, "queueing ".$reqfile." for $host_id");
  Debug(4, "queueing ".$reqfile);  
  my $Handle = IO::File->new($reqfile);   my $Handle = IO::File->new($reqfile);
  my $cmd    = <$Handle>;   my $cmd    = <$Handle>;
  chomp $cmd; # There may or may not be a newline...   chomp $cmd; # There may or may not be a newline...
  $cmd = $cmd."\n"; # now for sure there's exactly one newline.   $cmd = $cmd."\n"; # now for sure there's exactly one newline.
  my $Transaction = LondTransaction->new($cmd);   my $Transaction = LondTransaction->new("sethost:$host_id:$cmd");
  $Transaction->SetDeferred($reqfile);   $Transaction->SetDeferred($reqfile);
  QueueTransaction($Transaction);   QueueTransaction($Transaction);
     }      }
Line 1105  sub QueueDelayed { Line 1235  sub QueueDelayed {
 =head2 MakeLondConnection  =head2 MakeLondConnection
   
 Create a new lond connection object, and start it towards its initial  Create a new lond connection object, and start it towards its initial
 idleness.  Once idle, it becomes elligible to receive transactions  idleness.  Once idle, it becomes eligible to receive transactions
 from the work queue.  If the work queue is not empty when the  from the work queue.  If the work queue is not empty when the
 connection is completed and becomes idle, it will dequeue an entry and  connection is completed and becomes idle, it will dequeue an entry and
 start off on it.  start off on it.
   
 =cut  =cut
   
 sub MakeLondConnection {       sub MakeLondConnection {
       my ($restart) = @_;
     Debug(4,"MakeLondConnection to ".GetServerHost()." on port "      Debug(4,"MakeLondConnection to ".GetServerHost()." on port "
   .GetServerPort());    .GetServerPort());
   
     my $Connection = LondConnection->new(&GetServerHost(),      my $Connection = LondConnection->new(&GetServerHost(),
  &GetServerPort());   &GetServerPort(),
    &GetHostId(),
    &GetDefHostId());
   
     if($Connection eq undef) { # Needs to be more robust later.      if($Connection eq undef) {
  Log("CRITICAL","Failed to make a connection with lond.");   Log("CRITICAL","Failed to make a connection with lond.");
  $ConnectionRetriesLeft--;   $ConnectionRetriesLeft--;
  return 0; # Failure.   return 0; # Failure.
     }  else {      }  else {
    $LondConnecting = 1; # Connection in progress.
  # The connection needs to have writability    # The connection needs to have writability 
  # monitored in order to send the init sequence   # monitored in order to send the init sequence
  # that starts the whole authentication/key   # that starts the whole authentication/key
Line 1132  sub MakeLondConnection { Line 1265  sub MakeLondConnection {
  #   #
  my $Socket = $Connection->GetSocket();   my $Socket = $Connection->GetSocket();
  if($Socket eq undef) {   if($Socket eq undef) {
     die "did not get a socket from the connection";      &child_exit(-1, "did not get a socket from the connection");
  } else {   } else {
     &Debug(9,"MakeLondConnection got socket: ".$Socket);      &Debug(9,"MakeLondConnection got socket: ".$Socket);
  }   }
Line 1145  sub MakeLondConnection { Line 1278  sub MakeLondConnection {
    data     => $Connection,     data     => $Connection,
    desc => 'Connection to lond server');     desc => 'Connection to lond server');
  $ActiveConnections{$Connection} = $event;   $ActiveConnections{$Connection} = $event;
    if ($ConnectionCount == 0) {
  $ConnectionCount++;      &SetupTimer; # Need to handle timeouts with connections...
    }
           unless ($restart) {
       $ConnectionCount++;
           }
    $Connection->SetClientData($ConnectionCount);
  Debug(4, "Connection count = ".$ConnectionCount);   Debug(4, "Connection count = ".$ConnectionCount);
  if($ConnectionCount == 1) { # First Connection:   if($ConnectionCount == 1) { # First Connection:
     QueueDelayed;      QueueDelayed;
  }   }
  Log("SUCESS", "Created connection ".$ConnectionCount   Log("SUCCESS", "Created connection ".$ConnectionCount
     ." to host ".GetServerHost());      ." to host ".GetServerHost());
  return 1; # Return success.   return 1; # Return success.
     }      }
Line 1172  reply. Line 1310  reply.
   
 =item $Client  =item $Client
   
 Connection to the client that is making this request We got the  Connection to the client that is making this request. We got the
 request from this socket, and when the request has been relayed to  request from this socket, and when the request has been relayed to
 lond and we get a reply back from lond it will get sent to this  lond and we get a reply back from lond it will get sent to this
 socket.  socket.
Line 1236  sub QueueTransaction { Line 1374  sub QueueTransaction {
     if(!defined $LondSocket) { # Need to queue request.      if(!defined $LondSocket) { # Need to queue request.
  Debug(5,"Must queue...");   Debug(5,"Must queue...");
  $WorkQueue->enqueue($requestData);   $WorkQueue->enqueue($requestData);
  if($ConnectionCount < $MaxConnectionCount) {   Debug(5, "Queue Transaction startnew $ConnectionCount $LondConnecting");
    if(($ConnectionCount < $MaxConnectionCount)   && (! $LondConnecting)) {
   
     if($ConnectionRetriesLeft > 0) {      if($ConnectionRetriesLeft > 0) {
  Debug(5,"Starting additional lond connection");   Debug(5,"Starting additional lond connection");
  if(MakeLondConnection() == 0) {   if(&MakeLondConnection() == 0) {
     EmptyQueue(); # Fail transactions, can't make connection.      EmptyQueue(); # Fail transactions, can't make connection.
     CloseAllLondConnections; # Should all be closed but...      CloseAllLondConnections; # Should all be closed but...
  }   }
  &SetupTimer($ShortTickLength);  
     } else {      } else {
  ShowStatus(GetServerHost()." >>> DEAD !!!! <<<");   ShowStatus(GetServerHost()." >>> DEAD !!!! <<<");
    $LondConnecting = 0;
  EmptyQueue(); # It's worse than that ... he's dead Jim.   EmptyQueue(); # It's worse than that ... he's dead Jim.
  CloseAllLondConnections; # Should all be closed but..   CloseAllLondConnections; # Should all be closed but..
     }      }
Line 1256  sub QueueTransaction { Line 1396  sub QueueTransaction {
     }      }
 }  }
   
 #-------------------------- Lonc UNIX socket handling ---------------------  #-------------------------- Lonc UNIX socket handling -------------------
   
 =pod  =pod
   
 =head2 ClientRequest  =head2 ClientRequest
   
 Callback that is called when data can be read from the UNIX domain  Callback that is called when data can be read from the UNIX domain
 socket connecting us with an apache server process.  socket connecting us with an apache server process.
   
Line 1291  sub ClientRequest { Line 1431  sub ClientRequest {
     $data = $data.$thisread; # Append new data.      $data = $data.$thisread; # Append new data.
     $watcher->data($data);      $watcher->data($data);
     if($data =~ /\n$/) { # Request entirely read.      if($data =~ /\n$/) { # Request entirely read.
  if($data eq "close_connection_exit\n") {   if ($data eq "close_connection_exit\n") {
     Log("CRITICAL",      Log("CRITICAL",
  "Request Close Connection ... exiting");   "Request Close Connection ... exiting");
     CloseAllLondConnections();      CloseAllLondConnections();
     exit;      exit;
    } elsif ($data eq "reset_retries\n") {
       Log("INFO", "Resetting Connection Retries.");
       $ConnectionRetriesLeft = $ConnectionRetries;
       &UpdateStatus();
       my $Transaction = LondTransaction->new($data);
       $Transaction->SetClient($socket);
       StartClientReply($Transaction, "ok\n");
       $watcher->cancel();
       return;
  }   }
  Debug(8, "Complete transaction received: ".$data);   Debug(8, "Complete transaction received: ".$data);
  if($LogTransactions) {   if ($LogTransactions) {
     Log("SUCCESS", "Transaction: '$data'"); # Transaction has \n.      Log("SUCCESS", "Transaction: '$data'"); # Transaction has \n.
  }   }
  my $Transaction = LondTransaction->new($data);   my $Transaction = LondTransaction->new($data);
Line 1309  sub ClientRequest { Line 1458  sub ClientRequest {
   
 }  }
   
   #
   #     Accept a connection request for a client (lonc child) and
   #    start up an event watcher to keep an eye on input from that 
   #    Event.  This can be called both from NewClient and from
   #    ChildProcess.
   # Parameters:
   #    $socket       - The listener socket.
   # Returns:
   #   NONE
   # Side Effects:
   #    An event is made to watch the accepted connection.
   #    Active clients hash is updated to reflect the new connection.
   #    The client connection count is incremented.
   #
   sub accept_client {
       my ($socket) = @_;
   
       Debug(8, "Entering accept for lonc UNIX socket\n");
       my $connection = $socket->accept(); # Accept the client connection.
       Debug(8,"Connection request accepted from "
     .GetPeername($connection, AF_UNIX));
   
   
       my $description = sprintf("Connection to lonc client %d",
         $ClientConnection);
       Debug(9, "Creating event named: ".$description);
       Event->io(cb      => \&ClientRequest,
         poll    => 'r',
         desc    => $description,
         data    => "",
         fd      => $connection);
       $ActiveClients{$connection} = $ClientConnection;
       $ClientConnection++;
   }
   
 =pod  =pod
   
Line 1317  sub ClientRequest { Line 1500  sub ClientRequest {
 Callback that is called when a connection is received on the unix  Callback that is called when a connection is received on the unix
 socket for a new client of lonc.  The callback is parameterized by the  socket for a new client of lonc.  The callback is parameterized by the
 event.. which is a-priori assumed to be an io event, and therefore has  event.. which is a-priori assumed to be an io event, and therefore has
 an fd member that is the Listener socket.  We Accept the connection  an fd member that is the Listener socket.  We accept the connection
 and register a new event on the readability of that socket:  and register a new event on the readability of that socket:
   
 =cut  =cut
Line 1327  sub NewClient { Line 1510  sub NewClient {
     my $event      = shift; # Get the event parameters.      my $event      = shift; # Get the event parameters.
     my $watcher    = $event->w;       my $watcher    = $event->w; 
     my $socket     = $watcher->fd; # Get the event' socket.      my $socket     = $watcher->fd; # Get the event' socket.
     my $connection = $socket->accept(); # Accept the client connection.  
     Debug(8,"Connection request accepted from "  
   .GetPeername($connection, AF_UNIX));  
   
       &accept_client($socket);
     my $description = sprintf("Connection to lonc client %d",  
       $ClientConnection);  
     Debug(9, "Creating event named: ".$description);  
     Event->io(cb      => \&ClientRequest,  
       poll    => 'r',  
       desc    => $description,  
       data    => "",  
       fd      => $connection);  
     $ActiveClients{$connection} = $ClientConnection;  
     $ClientConnection++;  
 }  }
   
 =pod  =pod
Line 1351  sub NewClient { Line 1521  sub NewClient {
 Returns the name of the UNIX socket on which to listen for client  Returns the name of the UNIX socket on which to listen for client
 connections.  connections.
   
   =head2 Parameters:
   
       host (optional)  - Name of the host socket to return.. defaults to
                          the return from GetServerHost().
   
 =cut  =cut
   
 sub GetLoncSocketPath {  sub GetLoncSocketPath {
     return $UnixSocketDir."/".GetServerHost();  
       my $host = GetServerHost(); # Default host.
       if (@_) {
    ($host)  = @_; # Override if supplied.
       }
       return $UnixSocketDir."/".$host;
 }  }
   
 =pod  =pod
Line 1371  sub GetServerHost { Line 1551  sub GetServerHost {
   
 =pod  =pod
   
   =head2 GetHostId
   
   Returns the hostid whose lond we talk with.
   
   =cut
   
   sub GetHostId {
       return $RemoteHostId; # Setup by the fork.
   }
   
   =pod
   
   =head2 GetDefHostId
   
   Returns the default hostid for the node whose lond we talk with.
   
   =cut
   
   sub GetDefHostId {                      # Setup by the fork.
       return $RemoteDefHostId;
   }
   
   =pod
   
 =head2 GetServerPort  =head2 GetServerPort
   
 Returns the lond port number.  Returns the lond port number.
Line 1388  sub GetServerPort { Line 1592  sub GetServerPort {
 Setup a lonc listener event.  The event is called when the socket  Setup a lonc listener event.  The event is called when the socket
 becomes readable.. that corresponds to the receipt of a new  becomes readable.. that corresponds to the receipt of a new
 connection.  The event handler established will accept the connection  connection.  The event handler established will accept the connection
 (creating a communcations channel), that int turn will establish  (creating a communications channel), that in turn will establish
 another event handler to subess requests.  another event handler to subess requests.
   
   =head2  Parameters:
   
      host (optional)   Name of the host to set up a unix socket to.
   
 =cut  =cut
   
 sub SetupLoncListener {  sub SetupLoncListener {
       my ($host,$SocketName) = @_;
       if (!$host) { $host = &GetServerHost(); }
       if (!$SocketName) { $SocketName = &GetLoncSocketPath($host); }
   
   
     my $socket;  
     my $SocketName = GetLoncSocketPath();  
     unlink($SocketName);      unlink($SocketName);
   
       my $socket;
     unless ($socket =IO::Socket::UNIX->new(Local  => $SocketName,      unless ($socket =IO::Socket::UNIX->new(Local  => $SocketName,
     Listen => 10,       Listen => 250, 
     Type   => SOCK_STREAM)) {      Type   => SOCK_STREAM)) {
  die "Failed to create a lonc listner socket";   if($I_am_child) {
       &child_exit(-1, "Failed to create a lonc listener socket");
    } else {
       die "Failed to create a lonc listner socket";
    }
     }      }
     Event->io(cb     => \&NewClient,      return $socket;
       poll   => 'r',  
       desc   => 'Lonc listener Unix Socket',  
       fd     => $socket);  
 }  }
   
 #  #
Line 1436  into the status file. Line 1649  into the status file.
   
 We also use this to reset the retries count in order to allow the  We also use this to reset the retries count in order to allow the
 client to retry connections with a previously dead server.  client to retry connections with a previously dead server.
   
 =cut  =cut
   
 sub ChildStatus {  sub ChildStatus {
Line 1444  sub ChildStatus { Line 1658  sub ChildStatus {
   
     Debug(2, "Reporting child status because : ".$watcher->data);      Debug(2, "Reporting child status because : ".$watcher->data);
     my $docdir = $perlvar{'lonDocRoot'};      my $docdir = $perlvar{'lonDocRoot'};
     my $fh = IO::File->new(">>$docdir/lon-status/loncstatus.txt");      
     print $fh $$."\t".$RemoteHost."\t".$Status."\t".      open(LOG,">>$docdir/lon-status/loncstatus.txt");
       flock(LOG,LOCK_EX);
       print LOG $$."\t".$RemoteHost."\t".$Status."\t".
  $RecentLogEntry."\n";   $RecentLogEntry."\n";
     #      #
     #  Write out information about each of the connections:      #  Write out information about each of the connections:
     #      #
     if ($DebugLevel > 2) {      if ($DebugLevel > 2) {
  print $fh "Active connection statuses: \n";   print LOG "Active connection statuses: \n";
  my $i = 1;   my $i = 1;
  print STDERR  "================================= Socket Status Dump:\n";   print STDERR  "================================= Socket Status Dump:\n";
  foreach my $item (keys %ActiveConnections) {   foreach my $item (keys %ActiveConnections) {
     my $Socket = $ActiveConnections{$item}->data;      my $Socket = $ActiveConnections{$item}->data;
     my $state  = $Socket->GetState();      my $state  = $Socket->GetState();
     print $fh "Connection $i State: $state\n";      print LOG "Connection $i State: $state\n";
     print STDERR "---------------------- Connection $i \n";      print STDERR "---------------------- Connection $i \n";
     $Socket->Dump(-1); # Ensure it gets dumped..      $Socket->Dump(-1); # Ensure it gets dumped..
     $i++;      $i++;
  }   }
     }      }
       flock(LOG,LOCK_UN);
       close(LOG);
     $ConnectionRetriesLeft = $ConnectionRetries;      $ConnectionRetriesLeft = $ConnectionRetries;
       UpdateStatus();
 }  }
   
 =pod  =pod
Line 1484  sub SignalledToDeath { Line 1703  sub SignalledToDeath {
     chomp($signal);      chomp($signal);
     Log("CRITICAL", "Abnormal exit.  Child $$ for $RemoteHost "      Log("CRITICAL", "Abnormal exit.  Child $$ for $RemoteHost "
  ."died through "."\"$signal\"");   ."died through "."\"$signal\"");
     LogPerm("F:lonc: $$ on $RemoteHost signalled to death: "      #LogPerm("F:lonc: $$ on $RemoteHost signalled to death: "
     ."\"$signal\"");  #    ."\"$signal\"");
       &clear_childpid($$);
     exit 0;      exit 0;
   
 }  }
   
   =pod
   
 =head2 ToggleDebug  =head2 ToggleDebug
   
 This sub toggles trace debugging on and off.  This sub toggles trace debugging on and off.
Line 1505  sub ToggleDebug { Line 1727  sub ToggleDebug {
   
 }  }
   
   =pod
   
 =head2 ChildProcess  =head2 ChildProcess
   
 This sub implements a child process for a single lonc daemon.  This sub implements a child process for a single lonc daemon.
   Optional parameter:
      $socket  - if provided, this is a socket already open for listening
                 on the client socket. Otherwise, a new listener is set up.
   
 =cut  =cut
   
 sub ChildProcess {  sub ChildProcess {
       #  We've inherited all the
       #  events of our parent and those have to be cancelled or else
       #  all holy bloody chaos will result.. trust me, I already made
       #  >that< mistake.
   
       my $host = GetServerHost();
       foreach my $listener (keys %parent_dispatchers) {
    my $watcher = $parent_dispatchers{$listener};
    my $s       = $watcher->fd;
    if ($listener ne $host) { # Close everyone but me.
       Debug(5, "Closing listen socket for $listener");
       $s->close();
    }
    Debug(5, "Killing watcher for $listener");
   
    $watcher->cancel();
    delete($parent_dispatchers{$listener});
   
       }
   
       #  kill off the parent's signal handlers too!  
       #
   
       for my $handler (keys %parent_handlers) {
    my $watcher = $parent_handlers{$handler};
    $watcher->cancel();
    delete($parent_handlers{$handler});
       }
   
       $I_am_child    = 1; # Seems like in spite of it all I may still getting
                                   # parent event dispatches.. flag I'm a child.
   
   
     #      #
     #  Signals must be handled by the Event framework...      #  Signals must be handled by the Event framework...
 #      #
   
     Event->signal(signal   => "QUIT",      Event->signal(signal   => "QUIT",
   cb       => \&SignalledToDeath,    cb       => \&SignalledToDeath,
Line 1533  sub ChildProcess { Line 1791  sub ChildProcess {
   cb       => \&ToggleDebug,    cb       => \&ToggleDebug,
   data     => "INT");    data     => "INT");
   
     SetupTimer($LongTickLength);      # Block the pipe signal we'll get when the socket disconnects.  We detect 
           # socket disconnection via send/receive failures. On disconnect, the
     SetupLoncListener();      # socket becomes readable .. which will force the disconnect detection.
   
       my $set = POSIX::SigSet->new(SIGPIPE);
       sigprocmask(SIG_BLOCK, $set);
   
       #  Figure out if we got passed a socket or need to open one to listen for
       #  client requests.
   
       my ($socket) = @_;
       if (!$socket) {
   
    $socket =  SetupLoncListener();
       }
       #  Establish an event to listen for client connection requests.
   
   
       Event->io(cb   => \&NewClient,
         poll => 'r',
         desc => 'Lonc Listener Unix Socket',
         fd   => $socket);
           
     $Event::Debuglevel = $DebugLevel;      $Event::DebugLevel = $DebugLevel;
           
     Debug(9, "Making initial lond connection for ".$RemoteHost);      Debug(9, "Making initial lond connection for ".$RemoteHost);
   
 # Setup the initial server connection:  # Setup the initial server connection:
           
      # &MakeLondConnection(); // let first work requirest do it.       # &MakeLondConnection(); // let first work request do it.
   
       #  need to accept the connection since the event may  not fire.
   
       &accept_client($socket);
   
     Debug(9,"Entering event loop");      Debug(9,"Entering event loop");
     my $ret = Event::loop(); #  Start the main event loop.      my $ret = Event::loop(); #  Start the main event loop.
           
           
     die "Main event loop exited!!!";      &child_exit (-1,"Main event loop exited!!!");
 }  }
   
 #  Create a new child for host passed in:  #  Create a new child for host passed in:
   
 sub CreateChild {  sub CreateChild {
       my ($host, $hostid, $defhostid) = @_;
   
     my $sigset = POSIX::SigSet->new(SIGINT);      my $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset);      sigprocmask(SIG_BLOCK, $sigset);
     my $host = shift;  
     $RemoteHost = $host;      $RemoteHost = $host;
       ShowStatus('Parent keeping the flock'); # Update time in status message.
     Log("CRITICAL", "Forking server for ".$host);      Log("CRITICAL", "Forking server for ".$host);
     my $pid          = fork;      my $pid          = fork;
     if($pid) { # Parent      if($pid) { # Parent
  $RemoteHost = "Parent";   $RemoteHost = "Parent";
  $ChildHash{$pid} = $host;   $ChildPid{$pid} = $host;
  $HostToPid{$host}= $pid;  
  sigprocmask(SIG_UNBLOCK, $sigset);   sigprocmask(SIG_UNBLOCK, $sigset);
    undef(@all_host_ids);
     } else { # child.      } else { # child.
    $RemoteHostId = $hostid;
    $RemoteDefHostId = $defhostid;
  ShowStatus("Connected to ".$RemoteHost);   ShowStatus("Connected to ".$RemoteHost);
  $SIG{INT} = 'DEFAULT';   $SIG{INT} = 'DEFAULT';
  sigprocmask(SIG_UNBLOCK, $sigset);   sigprocmask(SIG_UNBLOCK, $sigset);
  ChildProcess; # Does not return.   &ChildProcess(); # Does not return.
       }
   }
   
   # parent_client_connection:
   #    Event handler that processes client connections for the parent process.
   #    This sub is called when the parent is listening on a socket and
   #    a connection request arrives.  We must:
   #     Start a child process to accept the connection request.
   #     Kill our listen on the socket.
   # Parameter:
   #    event       - The event object that was created to monitor this socket.
   #                  event->w->fd is the socket.
   # Returns:
   #    NONE
   #
   sub parent_client_connection {
       if ($I_am_child) {
    #  Should not get here, but seem to anyway:
    &Debug(5," Child caught parent client connection event!!");
    my ($event) = @_;
    my $watcher = $event->w;
    $watcher->cancel(); # Try to kill it off again!!
       } else {
    &Debug(9, "parent_client_connection");
    my ($event)   = @_;
    my $watcher   = $event->w;
    my $socket    = $watcher->fd;
    my $connection = $socket->accept(); # Accept the client connection.
    Event->io(cb      => \&get_remote_hostname,
     poll    => 'r',
     data    => "",
     fd      => $connection);
       }
   }
   
   sub get_remote_hostname {
       my ($event)   = @_;
       my $watcher   = $event->w;
       my $socket    = $watcher->fd;
   
       my $thisread;
       my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);
       Debug(8, "rcv:  data length = ".length($thisread)." read =".$thisread);
       if (!defined($rv) || length($thisread) == 0) {
    # Likely eof on socket.
    Debug(5,"Client Socket closed on lonc for p_c_c");
    close($socket);
    $watcher->cancel();
    return;
       }
   
       my $data    = $watcher->data().$thisread;
       $watcher->data($data);
       if($data =~ /\n$/) { # Request entirely read.
    chomp($data);
       } else {
    return;
       }
   
       &Debug(5,"Creating child for $data (parent_client_connection)");
       (my $hostname,my $lonid,@all_host_ids) = split(':',$data);
       $ChildHost{$hostname}++;
       if ($ChildHost{$hostname} == 1) {
    &CreateChild($hostname,$lonid,$all_host_ids[-1]);
       } else {
    &Log('WARNING',"Request for a second child on $hostname");
       }
       # Clean up the listen since now the child takes over until it exits.
       $watcher->cancel(); # Nolonger listening to this event
       $socket->send("done\n");
       $socket->close();
   }
   
   # parent_listen:
   #    Opens a socket and starts a listen for the parent process on a client UNIX
   #    domain socket.
   #
   #    This involves:
   #       Creating a socket for listen.
   #       Removing any socket lock file
   #       Adding an event handler for this socket becoming readable
   #         To the parent's event dispatcher.
   # Parameters:
   #    loncapa_host    - LonCAPA cluster name of the host represented by the client
   #                      socket.
   # Returns:
   #    NONE
   #
   sub parent_listen {
       my ($loncapa_host) = @_;
       Debug(5, "parent_listen: $loncapa_host");
   
       my ($socket,$file);
       if (!$loncapa_host) {
    $loncapa_host = 'common_parent';
    $file         = $perlvar{'lonSockCreate'};
       } else {
    $file         = &GetLoncSocketPath($loncapa_host);
       }
       $socket = &SetupLoncListener($loncapa_host,$file);
   
       $listening_to{$socket} = $loncapa_host;
       if (!$socket) {
    die "Unable to create a listen socket for $loncapa_host";
       }
       
       my $lock_file = $file.".lock";
       unlink($lock_file); # No problem if it doesn't exist yet [startup e.g.]
   
       my $watcher = 
    Event->io(cb    => \&parent_client_connection,
     poll  => 'r',
     desc  => "Parent listener unix socket ($loncapa_host)",
     data => "",
     fd    => $socket);
       $parent_dispatchers{$loncapa_host} = $watcher;
   
   }
   
   sub parent_clean_up {
       my ($loncapa_host) = @_;
       Debug(1, "parent_clean_up: $loncapa_host");
   
       my $socket_file = &GetLoncSocketPath($loncapa_host);
       unlink($socket_file); # No problem if it doesn't exist yet [startup e.g.]
       my $lock_file   = $socket_file.".lock";
       unlink($lock_file); # No problem if it doesn't exist yet [startup e.g.]
   }
   
   
   
   #    This sub initiates a listen on the common unix domain lonc client socket.
   #    loncnew starts up with no children, and only spawns off children when a
   #    connection request occurs on the common client unix socket.  The spawned
   #    child continues to run until it has been idle a while at which point it
   #    eventually exits and once more the parent picks up the listen.
   #
   #  Parameters:
   #      NONE
   #  Implicit Inputs:
   #    The configuration file that has been read in by LondConnection.
   #  Returns:
   #     NONE
   #
   sub listen_on_common_socket {
       Debug(5, "listen_on_common_socket");
       &parent_listen();
   }
   
   #   server_died is called whenever a child process exits.
   #   Since this is dispatched via a signal, we must process all
   #   dead children until there are no more left.  The action
   #   is to:
   #      - Remove the child from the bookeeping hashes
   #      - Re-establish a listen on the unix domain socket associated
   #        with that host.
   # Parameters:
   #    The event, but we don't actually care about it.
   sub server_died {
       &Debug(9, "server_died called...");
       
       while(1) { # Loop until waitpid nowait fails.
    my $pid = waitpid(-1, WNOHANG);
    if($pid <= 0) {
       return; # Nothing left to wait for.
    }
    # need the host to restart:
   
    my $host = $ChildPid{$pid};
    if($host) { # It's for real...
       &Debug(9, "Caught sigchild for $host");
               &clear_childpid($pid);
       delete($ChildPid{$pid});
       delete($ChildHost{$host});
       &parent_clean_up($host);
   
    } else {
       &Debug(5, "Caught sigchild for pid not in hosts hash: $pid");
    }
     }      }
   
 }  }
   
 #  #
 #  Parent process logic pass 1:  #  Parent process logic pass 1:
 #   For each entry in the hosts table, we will  #   For each entry in the hosts table, we will
Line 1624  ShowStatus("Forking node servers"); Line 2087  ShowStatus("Forking node servers");
 Log("CRITICAL", "--------------- Starting children ---------------");  Log("CRITICAL", "--------------- Starting children ---------------");
   
 LondConnection::ReadConfig;               # Read standard config files.  LondConnection::ReadConfig;               # Read standard config files.
 my $HostIterator = LondConnection::GetHostIterator;  
 while (! $HostIterator->end()) {  
   
     my $hostentryref = $HostIterator->get();  $RemoteHost = "[parent]";
     CreateChild($hostentryref->[0]);  &listen_on_common_socket();
     $HostHash{$hostentryref->[0]} = $hostentryref->[4];  
     $HostIterator->next();  
 }  
 $RemoteHost = "Parent Server";  $RemoteHost = "Parent Server";
   
 # Maintain the population:  # Maintain the population:
   
 ShowStatus("Parent keeping the flock");  ShowStatus("Parent keeping the flock");
   
 #  
 #   Set up parent signals:  
 #  
   
 $SIG{INT}  = \&Terminate;  
 $SIG{TERM} = \&Terminate;   
 $SIG{HUP}  = \&Restart;  
 $SIG{USR1} = \&CheckKids;   
 $SIG{USR2} = \&UpdateKids; # LonManage update request.  
   
 while(1) {  
     my $deadchild = wait();  
     if(exists $ChildHash{$deadchild}) { # need to restart.  
  my $deadhost = $ChildHash{$deadchild};  
  delete($HostToPid{$deadhost});  
  delete($ChildHash{$deadchild});  
  Log("WARNING","Lost child pid= ".$deadchild.  
       "Connected to host ".$deadhost);  
  Log("INFO", "Restarting child procesing ".$deadhost);  
  CreateChild($deadhost);  
     }  
 }  
   
   # We need to setup a SIGChild event to handle the exit (natural or otherwise)
   # of the children.
   
   Event->signal(cb       => \&server_died,
         desc     => "Child exit handler",
         signal   => "CHLD");
   
   
   # Set up all the other signals we set up.
   
   $parent_handlers{INT} = Event->signal(cb       => \&Terminate,
         desc     => "Parent INT handler",
         signal   => "INT");
   $parent_handlers{TERM} = Event->signal(cb       => \&Terminate,
          desc     => "Parent TERM handler",
          signal   => "TERM");
   $parent_handlers{HUP}  = Event->signal(cb       => \&KillThemAll,
          desc     => "Parent HUP handler.",
          signal   => "HUP");
   $parent_handlers{USR1} = Event->signal(cb       => \&CheckKids,
          desc     => "Parent USR1 handler",
          signal   => "USR1");
   $parent_handlers{USR2} = Event->signal(cb       => \&UpdateKids,
          desc     => "Parent USR2 handler.",
          signal   => "USR2");
   
   #  Start procdesing events.
   
   $Event::DebugLevel = $DebugLevel;
   Debug(9, "Parent entering event loop");
   my $ret = Event::loop();
   die "Main Event loop exited: $ret";
   
 =pod  =pod
   
 =head1 CheckKids  =head1 CheckKids
   
   Since kids do not die as easily in this implementation    Since kids do not die as easily in this implementation
 as the previous one, there  is no need to restart the  as the previous one, there is no need to restart the
 dead ones (all dead kids get restarted when they die!!)  dead ones (all dead kids get restarted when they die!!)
 The only thing this function does is to pass USR1 to the  The only thing this function does is to pass USR1 to the
 kids so that they report their status.  kids so that they report their status.
Line 1682  sub CheckKids { Line 2150  sub CheckKids {
     my $now=time;      my $now=time;
     my $local=localtime($now);      my $local=localtime($now);
     print $fh "LONC status $local - parent $$ \n\n";      print $fh "LONC status $local - parent $$ \n\n";
     foreach my $pid (keys %ChildHash) {      foreach my $host (keys %parent_dispatchers) {
    print $fh "LONC Parent process listening for $host\n";
       }
       foreach my $pid (keys %ChildPid) {
  Debug(2, "Sending USR1 -> $pid");   Debug(2, "Sending USR1 -> $pid");
  kill 'USR1' => $pid; # Tell Child to report status.   kill 'USR1' => $pid; # Tell Child to report status.
  sleep 1; # Wait so file doesn't intermix.  
     }      }
   
 }  }
   
 =pod  =pod
Line 1719  sub UpdateKids { Line 2190  sub UpdateKids {
   
     Log("INFO", "Updating connections via SIGUSR2");      Log("INFO", "Updating connections via SIGUSR2");
   
     #  Just in case we need to kill our own lonc, we wait a few seconds to      #  I'm not sure what I was thinking in the first implementation.
     #  give it a chance to receive and relay lond's response to the       # someone will have to work hard to convince me the effect is any
     #  re-init command.      # different than Restart, especially now that we don't start up 
     #      # per host servers automatically, may as well just restart.
       # The down side is transactions that are in flight will get timed out
     sleep(2); # Wait a couple of seconds.      # (lost unless they are critical).
   
     my %hosts;                   # Indexed by loncapa hostname, value=ip.      &KillThemAll();
           LondConnection->ResetReadConfig();
     # Need to re-read  the host table:      ShowStatus('Parent keeping the flock');
       
       
     LondConnection::ReadConfig();  
     my $I = LondConnection::GetHostIterator;  
     while (! $I->end()) {  
  my $item = $I->get();  
  $hosts{$item->[0]} = $item->[4];  
  $I->next();  
     }  
   
     #  The logic below is written for clarity not for efficiency.  
     #  Since I anticipate that this function is only rarely called, that's  
     #  appropriate.  There are certainly ways to combine the loops below,  
     #  and anyone wishing to obscure the logic is welcome to go for it.  
     #  Note that we don't re-direct sigchild.  Instead we do what's needed  
     #  to the data structures that keep track of children to ensure that  
     #  when sigchild is honored, no new child is born.  
     #  
   
     #  For each existing child; if it's host doesn't exist, kill the child.  
   
     foreach my $child (keys %ChildHash) {  
  my $oldhost = $ChildHash{$child};  
  if (!(exists $hosts{$oldhost})) {  
     Log("CRITICAL", "Killing child for $oldhost  host no longer exists");  
     delete $ChildHash{$child};  
     delete $HostToPid{$oldhost};  
     kill 'QUIT' => $child;  
  }  
     }  
     # For each remaining existing child; if it's host's ip has changed,  
     # Restart the child on the new IP.  
   
     foreach my $child (keys %ChildHash) {  
  my $oldhost = $ChildHash{$child};  
  my $oldip   = $HostHash{$oldhost};  
  if ($hosts{$oldhost} ne $oldip) {  
   
     # kill the old child.  
   
     Log("CRITICAL", "Killing child for $oldhost host ip has changed...");  
     delete $ChildHash{$child};  
     delete $HostToPid{$oldhost};  
     kill 'QUIT' => $child;  
   
     # Do the book-keeping needed to start a new child on the  
     # new ip.  
   
     $HostHash{$oldhost} = $hosts{$oldhost};  
     CreateChild($oldhost);  
  }  
     }  
     # Finally, for each new host, not in the host hash, create a  
     # enter the host and create a new child.  
     # Force a status display of any existing process.  
   
     foreach my $host (keys %hosts) {  
  if(!(exists $HostHash{$host})) {  
     Log("INFO", "New host $host discovered in hosts.tab...");  
     $HostHash{$host} = $hosts{$host};  
     CreateChild($host);  
  } else {  
     kill 'HUP' => $HostToPid{$host};    # status display.  
  }  
     }  
 }  }
   
   
Line 1802  sub UpdateKids { Line 2208  sub UpdateKids {
 =head1 Restart  =head1 Restart
   
 Signal handler for HUP... all children are killed and  Signal handler for HUP... all children are killed and
 we self restart.  This is an el-cheapo way to re read  we self restart.  This is an el-cheapo way to re-read
 the config file.  the config file.
   
 =cut  =cut
   
 sub Restart {  sub Restart {
     &KillThemAll; # First kill all the children.      &KillThemAll; # First kill all the children.
       LondConnection->ResetReadConfig();
     Log("CRITICAL", "Restarting");      Log("CRITICAL", "Restarting");
     my $execdir = $perlvar{'lonDaemons'};      my $execdir = $perlvar{'lonDaemons'};
     unlink("$execdir/logs/lonc.pid");      unlink("$execdir/logs/lonc.pid");
     exec("$execdir/loncnew");      exec("$executable");
 }  }
   
 =pod  =pod
Line 1826  SIGHUP.  Responds to sigint and sigterm. Line 2233  SIGHUP.  Responds to sigint and sigterm.
   
 sub KillThemAll {  sub KillThemAll {
     Debug(2, "Kill them all!!");      Debug(2, "Kill them all!!");
     local($SIG{CHLD}) = 'IGNORE';      # Our children >will< die.      
     foreach my $pid (keys %ChildHash) {      #local($SIG{CHLD}) = 'IGNORE';
  my $serving = $ChildHash{$pid};      # Our children >will< die.
  Debug(2, "Killing lonc for $serving pid = $pid");      # but we need to catch their death and cleanup after them in case this is 
  ShowStatus("Killing lonc for $serving pid = $pid");      # a restart set of kills
  Log("CRITICAL", "Killing lonc for $serving pid = $pid");      my @allpids = keys(%ChildPid);
       foreach my $pid (@allpids) {
    my $serving = $ChildPid{$pid};
    ShowStatus("Nicely Killing lonc for $serving pid = $pid");
    Log("CRITICAL", "Nicely Killing lonc for $serving pid = $pid");
  kill 'QUIT' => $pid;   kill 'QUIT' => $pid;
  delete($ChildHash{$pid});          &clear_childpid($pid);
     }      }
     my $execdir = $perlvar{'lonDaemons'};      ShowStatus("Finished killing child processes off.");
     unlink("$execdir/logs/lonc.pid");  }
   
   
   #
   #  Kill all children via KILL.  Just in case the
   #  first shot didn't get them.
   
   sub really_kill_them_all_dammit
   {
       Debug(2, "Kill them all Dammit");
       local($SIG{CHLD} = 'IGNORE'); # In case some purist reenabled them.
       foreach my $pid (keys %ChildPid) {
    my $serving = $ChildPid{$pid};
    &ShowStatus("Nastily killing lonc for $serving pid = $pid");
    Log("CRITICAL", "Nastily killing lonc for $serving pid = $pid");
    kill 'KILL' => $pid;
    delete($ChildPid{$pid});
           delete($ChildKeyMode{$pid});
    my $execdir = $perlvar{'lonDaemons'};
    unlink("$execdir/logs/lonc.pid");
       }
 }  }
   
 =pod  =pod
Line 1849  Terminate the system. Line 2279  Terminate the system.
 =cut  =cut
   
 sub Terminate {  sub Terminate {
     KillThemAll;      &Log("CRITICAL", "Asked to kill children.. first be nice...");
       &KillThemAll;
       #
       #  By now they really should all be dead.. but just in case 
       #  send them all SIGKILL's after a bit of waiting:
   
       sleep(4);
       &Log("CRITICAL", "Now kill children nasty");
       &really_kill_them_all_dammit;
     Log("CRITICAL","Master process exiting");      Log("CRITICAL","Master process exiting");
     exit 0;      exit 0;
   
 }  }
   
   =pod
   
   =cut
   
   sub my_hostname {
       use Sys::Hostname::FQDN();
       my $name = Sys::Hostname::FQDN::fqdn();
       &Debug(9,"Name is $name");
       return $name;
   }
   
   sub record_childpid {
       my ($Socket) = @_;
       my $docdir = $perlvar{'lonDocRoot'};
       my $authmode = $Socket->GetKeyMode();
       my $peer = $Socket->PeerLoncapaHim();
       if (($authmode eq 'ssl') || ($authmode eq 'insecure')) {
           my $childpid = $$;
           if ($childpid) {
               unless (exists($ChildKeyMode{$childpid})) {
                   $ChildKeyMode{$childpid} = $authmode;
               }
               if (-d "$docdir/lon-status/loncchld") {
                   unless (-e "$docdir/lon-status/loncchld/$childpid") {
                       if (open (my $pidfh,'>',"$docdir/lon-status/loncchld/$childpid")) {
                           print $pidfh "$peer:$authmode\n";
                           close($pidfh);
                       }
                   }
               }
           }
       }
       return;
   }
   
   sub clear_childpid {
       my ($childpid) = @_; 
       my $docdir = $perlvar{'lonDocRoot'};
       if (-d "$docdir/lon-status/loncchld") {
           if ($childpid =~ /^\d+$/) {
               if (($ChildKeyMode{$childpid} eq 'insecure') ||
                   ($ChildKeyMode{$childpid} eq 'ssl')) {
                   if (-e "$docdir/lon-status/loncchld/$childpid") {
                       unlink("$docdir/lon-status/loncchld/$childpid");
                   }
               }
           }
       }
       if (exists($ChildKeyMode{$childpid})) {
           delete($ChildKeyMode{$childpid});
       }
       return;
   }
   
 =pod  =pod
   
 =head1 Theory  =head1 Theory
Line 1895  A hash of lond connections that have no Line 2388  A hash of lond connections that have no
 can be closed if they are idle for a long enough time.  can be closed if they are idle for a long enough time.
   
 =cut  =cut
   
   =pod
   
   =head1 Log messages
   
   The following is a list of log messages that can appear in the 
   lonc.log file.  Each log file has a severity and a message.
   
   =over 2
   
   =item Warning  A socket timeout was detected
   
   If there are pending transactions in the socket's queue,
   they are failed (saved if critical).  If the connection
   retry count gets exceeded by this, the
   remote host is marked as dead.
   Called when timeouts occurred during the connection and
   connection dialog with a remote host.
   
   =item Critical Host makred DEAD <hostname>   
   
   The numer of retry counts for contacting a host was
   exceeded. The host is marked dead an no 
   further attempts will be made by that child.
   
   =item Info lonc pipe client hung up on us     
   
   Write to the client pipe indicated no data transferred
   Socket to remote host is shut down.  Reply to the client 
   is discarded.  Note: This is commented out in &ClientWriteable
   
   =item Success  Reply from lond: <data>   
   
   Can be enabled for debugging by setting LogTransactions to nonzero.
   Indicates a successful transaction with lond, <data> is the data received
   from the remote lond.
   
   =item Success A delayed transaction was completed  
   
   A transaction that must be reliable was executed and completed
   as lonc restarted.  This is followed by a mesage of the form
   
     S: client-name : request
   
   =item WARNING  Failing transaction <cmd>:<subcmd>  
   
   Transaction failed on a socket, but the failure retry count for the remote
   node has not yet been exhausted (the node is not yet marked dead).
   cmd is the command, subcmd is the subcommand.  This results from a con_lost
   when communicating with lond.
   
   =item WARNING Shutting down a socket     
   
   Called when a socket is being closed to lond.  This is emitted both when 
   idle pruning is being done and when the socket has been disconnected by the remote.
   
   =item WARNING Lond connection lost.
   
   Called when a read from lond's socket failed indicating lond has closed the 
   connection or died.  This should be followed by one or more
   
    "WARNING Failing transaction..." msgs for each in-flight or queued transaction.
   
   =item WARNING No SSL channel (verification failed), will try with insecure channel.
   
   Called when promotion of a socket to SSL failed because SSL certificate verification failed.
   Domain configuration must also permit insecure channel use for key exchange. Connection
   negotiation will start again from the beginning, but with Authentication Mode not set to ssl.
   
   =item INFO Connected to lond version:  <version> 
   
   When connection negotiation is complete, the lond version is requested and logged here.
   
   =item SUCCESS Connection n to host now ready for action
   
   Emitted when connection has been completed with lond. n is then number of 
   concurrent connections and host, the host to which the connection has just
   been established.
   
   =item WARNING Connection to host has been disconnected
   
   Write to a lond resulted in failure status.  Connection to lond is dropped.
   
   =item SUCCESS Created connection n to host host 
   
   Initial connection request to host..(before negotiation).
   
   =item CRITICAL Request Close Connection ... exiting
   
   Client has sent "close_connection_exit"   The loncnew server is exiting.
   
   =item INFO Resetting Connection Retries 
   
   Client has sent "reset_retries" The lond connection retries are reset to zero for the
   corresponding lond.
   
   =item SUCCESS Transaction <data>
   
   Only emitted if the global variable $LogTransactions was set to true.
   A client has requested a lond transaction <data> is the contents of the request.
   
   =item SUCCESS Toggled transaction logging <LogTransactions>
                                       
   The state of the $LogTransactions global has been toggled, and its current value
   (after being toggled) is displayed.  When non zero additional logging of transactions
   is enabled for debugging purposes.  Transaction logging is toggled on receipt of a USR2
   signal.
   
   =item CRITICAL Abnormal exit. Child <pid> for <host> died thorugh signal.
   
   QUIT signal received.  lonc child process is exiting.
   
   =item SUCCESS New debugging level for <RemoteHost> now <DebugLevel>
                                       
   Debugging toggled for the host loncnew is talking with.
   Currently debugging is a level based scheme with higher number 
   conveying more information.  The daemon starts out at
   DebugLevel 0 and can toggle back and forth between that and
   DebugLevel 2  These are controlled by
   the global variables $DebugLevel and $NextDebugLevel
   The debug level can go up to 9.
   SIGINT toggles the debug level.  The higher the debug level the 
   more debugging information is spewed.  See the Debug
   sub in loncnew.
   
   =item CRITICAL Forking server for host  
   
   A child is being created to service requests for the specified host.
   
   
   =item WARNING Request for a second child on hostname
                                       
   Somehow loncnew was asked to start a second child on a host that already had a child
   servicing it.  This request is not honored, but themessage is emitted.  This could happen
   due to a race condition.  When a client attempts to contact loncnew for a new host, a child
   is forked off to handle the requests for that server.  The parent then backs off the Unix
   domain socket leaving it for the child to service all requests.  If in the time between
   creating the child, and backing off, a new connection request comes in to the unix domain
   socket, this could trigger (unlikely but remotely possible),.
   
   =item CRITICAL ------ Starting Children ----
   
   This message should probably be changed to "Entering event loop"  as the loncnew only starts
   children as needed.  This message is emitted as new events are established and
   the event processing loop is entered.
   
   =item INFO Updating connections via SIGUSR2
                                       
   SIGUSR2 received. The original code would kill all clients, re-read the host file,
   then restart children for each host.  Now that children are started on demand, this
   just kills all child processes and lets requests start them as needed again.
   
   
   =item CRITICAL Restarting
   
   SigHUP received.  all the children are killed and the script exec's itself to start again.
   
   =item CRITICAL Nicely killing lonc for host pid = <pid>
   
   Attempting to kill the child that is serving the specified host (pid given) cleanly via
   SIGQUIT.  The child should handle that, clean up nicely and exit.
   
   =item CRITICAL Nastily killing lonc for host pid = <pid>
   
   The child specified did not die when requested via SIGQUIT.  Therefore it is killed
   via SIGKILL.
   
   =item CRITICAL Asked to kill children.. first be nice..
   
   In the parent's INT handler.  INT kills the child processes.  This inidicate loncnew
   is about to attempt to kill all known children via SIGQUIT.  This message should be followed 
   by one "Nicely killing" message for each extant child.
   
   =item CRITICAL Now kill children nasty 
   
   In the parent's INT handler. remaining children are about to be killed via
   SIGKILL. Should be followed by a Nastily killing... for each lonc child that 
   refused to die.
   
   =item CRITICAL Master process exiting
   
   In the parent's INT handler. just prior to the exit 0 call.
   
   =back
   
   =cut
Removed from v.1.51  
changed lines
  Added in v.1.107

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