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Diff for /loncom/loncnew between versions 1.78 and 1.107

version 1.78, 2007/03/28 00:05:38	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);	use Fcntl qw(:flock);


Line 73 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	my %listening_to; # Socket->host table for who the parent
# is listening to.	# is listening to.
my %parent_dispatchers; # host-> listener watcher events.	my %parent_dispatchers; # host-> listener watcher events.
Line 87 my $ClientConnection = 0; # Uniquifier f	Line 86 my $ClientConnection = 0; # Uniquifier f

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.	my $executable = $0; # Get the full path to me.
Line 95 my $executable = $0; # Get the full	Line 94 my $executable = $0; # Get the full
#	#
# 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 114 my $LondConnecting = 0; # True wh	Line 116 my $LondConnecting = 0; # True wh



my $DieWhenIdle = 1; # When true children die when trimmed -> 0.
my $hosts_tab = 1; # True if we are using a static hosts.tab
my $I_am_child = 0; # True if this is the child process.	my $I_am_child = 0; # True if this is the child process.

#	#
Line 160 sub LogPerm {	Line 160 sub LogPerm {
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 309 sub SocketTimeout {	Line 310 sub SocketTimeout {
}	}

}	}

#	#
# This function should be called by the child in all cases where it must	# This function should be called by the child in all cases where it must
# exit. If the child process is running with the DieWhenIdle turned on	# exit. The child process must create a lock file for the AF_UNIX socket
# it must create a lock file for the AF_UNIX socket in order to prevent	# in order to prevent connection requests from lonnet in the time between
# connection requests from lonnet in the time between process exit	# process exit and the parent picking up the listen again.
# and the parent picking up the listen again.	#
# Parameters:	# Parameters:
# exit_code - Exit status value, however see the next parameter.	# exit_code - Exit status value, however see the next parameter.
# message - If this optional parameter is supplied, the exit	# message - If this optional parameter is supplied, the exit
Line 325 sub child_exit {	Line 327 sub child_exit {

# Regardless of how we exit, we may need to do the lock thing:	# Regardless of how we exit, we may need to do the lock thing:

if($DieWhenIdle) {	#
#	# Create a lock file since there will be a time window
# Create a lock file since there will be a time window	# between our exit and the parent's picking up the listen
# between our exit and the parent's picking up the listen	# during which no listens will be done on the
# during which no listens will be done on the	# lonnet client socket.
# lonnet client socket.	#
#	my $lock_file = &GetLoncSocketPath().".lock";
my $lock_file = &GetLoncSocketPath().".lock";	open(LOCK,">$lock_file");
open(LOCK,">$lock_file");	print LOCK "Contents not important";
print LOCK "Contents not important";	close(LOCK);
close(LOCK);	unlink(&GetLoncSocketPath());
if ($hosts_tab) {
unlink(&GetLoncSocketPath());
}
exit(0);
}
# Now figure out how we exit:

if($message) {	if ($message) {
die $message;	die($message);
} else {	} else {
exit($exit_code);	exit($exit_code);
}	}
Line 355 sub child_exit {	Line 351 sub child_exit {

=head2 Tick	=head2 Tick

Invoked each timer tick.	Invoked each timer tick.

=cut	=cut

Line 378 sub Tick {	Line 374 sub Tick {
KillSocket($Socket);	KillSocket($Socket);
$IdleSeconds = 0; # Otherwise all connections get trimmed to fast.	$IdleSeconds = 0; # Otherwise all connections get trimmed to fast.
UpdateStatus();	UpdateStatus();
if(($ConnectionCount == 0) && $DieWhenIdle) {	if(($ConnectionCount == 0)) {
&child_exit(0);	&child_exit(0);

}	}
Line 447 Trigger disconnections of idle sockets.	Line 443 Trigger disconnections of idle sockets.

sub SetupTimer {	sub SetupTimer {
Debug(6, "SetupTimer");	Debug(6, "SetupTimer");
Event->timer(interval => 1, cb => \&Tick );	Event->timer(interval => 1, cb => \&Tick,
	hard => 1);
}	}

=pod	=pod
Line 493 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 509 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 561 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 572 sub ClientWritable {	Line 573 sub ClientWritable {
}	}
} else {	} else {
$Watcher->cancel(); # A delayed request...just cancel.	$Watcher->cancel(); # A delayed request...just cancel.
	return;
}	}
}	}

Line 589 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 611 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 630 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 741 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();	$Socket->Shutdown();
Line 763 sub KillSocket {	Line 766 sub KillSocket {
delete ($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 785 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 795 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 821 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 840 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 868 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 {	} else {
# Socket is connecting and failed... need to mark	# Socket is connecting and failed... need to mark
# no longer connecting.	# no longer connecting.

$LondConnecting = 0;	$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,$Socket);
Line 889 sub LondReadable {	Line 919 sub LondReadable {
if($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 925 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 945 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.
Line 982 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 1089 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 1156 sub LondWritable {	Line 1198 sub LondWritable {
}	}

}	}

=pod	=pod

=cut	=cut


sub QueueDelayed {	sub QueueDelayed {
Debug(3,"QueueDelayed called");	Debug(3,"QueueDelayed called");

Line 1168 sub QueueDelayed {	Line 1212 sub QueueDelayed {
Debug(4, "Delayed path: ".$path);	Debug(4, "Delayed path: ".$path);
opendir(DIRHANDLE, $path);	opendir(DIRHANDLE, $path);

my @all_host_ids;	my $host_id_re = '(?:'.join('\|',map {quotemeta($_)} (@all_host_ids)).')';
my $host_iterator = &LondConnection::GetHostIterator();
while (!$host_iterator->end()) {
my ($host_id,$host_name) = @{$host_iterator->get()}[0,3];
if ($host_name eq $RemoteHost) {
push(@all_host_ids, $host_id);
}
$host_iterator->next();
}
my $host_id_re = '(?:'.join('\|',@all_host_ids).')';
my @alldelayed = grep(/\.$host_id_re$/, readdir(DIRHANDLE));	my @alldelayed = grep(/\.$host_id_re$/, readdir(DIRHANDLE));
closedir(DIRHANDLE);	closedir(DIRHANDLE);
foreach my $dfname (sort(@alldelayed)) {	foreach my $dfname (sort(@alldelayed)) {
Line 1200 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 {
	$LondConnecting = 1; # Connection in progress.
# The connection needs to have writability	# The connection needs to have writability
# monitored in order to send the init sequence	# monitored in order to send the init sequence
# that starts the whole authentication/key	# that starts the whole authentication/key
Line 1243 sub MakeLondConnection {	Line 1281 sub MakeLondConnection {
if ($ConnectionCount == 0) {	if ($ConnectionCount == 0) {
&SetupTimer; # Need to handle timeouts with connections...	&SetupTimer; # Need to handle timeouts with connections...
}	}
$ConnectionCount++;	unless ($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());
$LondConnecting = 1; # Connection in progress.
return 1; # Return success.	return 1; # Return success.
}	}

Line 1270 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 1356 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 1391 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 1413 sub ClientRequest {	Line 1462 sub ClientRequest {
# Accept a connection request for a client (lonc child) and	# Accept a connection request for a client (lonc child) and
# start up an event watcher to keep an eye on input from that	# start up an event watcher to keep an eye on input from that
# Event. This can be called both from NewClient and from	# Event. This can be called both from NewClient and from
# ChildProcess if we are started in DieWhenIdle mode.	# ChildProcess.
# Parameters:	# Parameters:
# $socket - The listener socket.	# $socket - The listener socket.
# Returns:	# Returns:
Line 1451 sub accept_client {	Line 1500 sub accept_client {
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 1502 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 1519 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:	=head2 Parameters:
Line 1632 sub SignalledToDeath {	Line 1705 sub SignalledToDeath {
."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;

}	}
Line 1659 sub ToggleDebug {	Line 1733 sub ToggleDebug {

This sub implements a child process for a single lonc daemon.	This sub implements a child process for a single lonc daemon.
Optional parameter:	Optional parameter:
$socket - if provided, this is a socket already open for listen	$socket - if provided, this is a socket already open for listening
on the client socket. Otherwise, a new listen is set up.	on the client socket. Otherwise, a new listener is set up.

=cut	=cut

sub ChildProcess {	sub ChildProcess {
# If we are in DieWhenIdle mode, we've inherited all the	# We've inherited all the
# events of our parent and those have to be cancelled or else	# events of our parent and those have to be cancelled or else
# all holy bloody chaos will result.. trust me, I already made	# all holy bloody chaos will result.. trust me, I already made
# >that< mistake.	# >that< mistake.
Line 1717 sub ChildProcess {	Line 1791 sub ChildProcess {
cb => \&ToggleDebug,	cb => \&ToggleDebug,
data => "INT");	data => "INT");

	# Block the pipe signal we'll get when the socket disconnects. We detect
	# socket disconnection via send/receive failures. On disconnect, the
	# 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	# Figure out if we got passed a socket or need to open one to listen for
# client requests.	# client requests.

Line 1741 sub ChildProcess {	Line 1822 sub ChildProcess {

# &MakeLondConnection(); // let first work request do it.	# &MakeLondConnection(); // let first work request do it.

# If We are in diwhenidle, need to accept the connection since the	# need to accept the connection since the event may not fire.
# event may not fire.

if ($DieWhenIdle) {	&accept_client($socket);
&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.
Line 1758 sub ChildProcess {	Line 1836 sub ChildProcess {
# Create a new child for host passed in:	# Create a new child for host passed in:

sub CreateChild {	sub CreateChild {
my ($host, $socket) = @_;	my ($host, $hostid, $defhostid) = @_;

my $sigset = POSIX::SigSet->new(SIGINT);	my $sigset = POSIX::SigSet->new(SIGINT);
sigprocmask(SIG_BLOCK, $sigset);	sigprocmask(SIG_BLOCK, $sigset);
$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);
if(defined $socket) {	&ChildProcess(); # Does not return.
&ChildProcess($socket);
} else {
ChildProcess; # Does not return.
}
}	}
}	}

Line 1807 sub parent_client_connection {	Line 1883 sub parent_client_connection {
my ($event) = @_;	my ($event) = @_;
my $watcher = $event->w;	my $watcher = $event->w;
my $socket = $watcher->fd;	my $socket = $watcher->fd;
if ($hosts_tab) {	my $connection = $socket->accept(); # Accept the client connection.
	Event->io(cb => \&get_remote_hostname,
# Lookup the host associated with this socket:	poll => 'r',
	data => "",
my $host = $listening_to{$socket};	fd => $connection);

# Start the child:



&Debug(9,"Creating child for $host (parent_client_connection)");
&CreateChild($host, $socket);

# Clean up the listen since now the child takes over until it exits.

$watcher->cancel(); # Nolonger listening to this event
delete($listening_to{$socket});
delete($parent_dispatchers{$host});
$socket->close();

} else {
my $connection = $socket->accept(); # Accept the client connection.
Event->io(cb => \&get_remote_hostname,
poll => 'r',
data => "",
fd => $connection);
}
}	}
}	}

sub get_remote_hostname {	sub get_remote_hostname {
my ($event) = @_;	my ($event) = @_;
my $watcher = $event->w;	my $watcher = $event->w;
my $socket = $watcher->fd;	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;	my $thisread;
$watcher->data($data);	my $rv = $socket->recv($thisread, POSIX::BUFSIZ, 0);
if($data =~ /\n$/) { # Request entirely read.	Debug(8, "rcv: data length = ".length($thisread)." read =".$thisread);
chomp($data);	if (!defined($rv) \|\| length($thisread) == 0) {
} else {	# Likely eof on socket.
return;	Debug(5,"Client Socket closed on lonc for p_c_c");
}	close($socket);
	$watcher->cancel();
&Debug(5,"Creating child for $data (parent_client_connection)");	return;
&CreateChild($data);	}

# Clean up the listen since now the child takes over until it exits.	my $data = $watcher->data().$thisread;
$watcher->cancel(); # Nolonger listening to this event	$watcher->data($data);
$socket->send("done\n");	if($data =~ /\n$/) { # Request entirely read.
$socket->close();	chomp($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:	# parent_listen:
Line 1918 sub parent_listen {	Line 1977 sub parent_listen {

sub parent_clean_up {	sub parent_clean_up {
my ($loncapa_host) = @_;	my ($loncapa_host) = @_;
Debug(5, "parent_clean_up: $loncapa_host");	Debug(1, "parent_clean_up: $loncapa_host");

my $socket_file = &GetLoncSocketPath($loncapa_host);	my $socket_file = &GetLoncSocketPath($loncapa_host);
unlink($socket_file); # No problem if it doesn't exist yet [startup e.g.]	unlink($socket_file); # No problem if it doesn't exist yet [startup e.g.]
Line 1927 sub parent_clean_up {	Line 1986 sub parent_clean_up {
}	}


# listen_on_all_unix_sockets:
# This sub initiates a listen on all unix domain lonc client sockets.	# This sub initiates a listen on the common unix domain lonc client socket.
# This will be called in the case where we are trimming idle processes.	# loncnew starts up with no children, and only spawns off children when a
# When idle processes are trimmed, loncnew starts up with no children,	# connection request occurs on the common client unix socket. The spawned
# and only spawns off children when a connection request occurs on the	# child continues to run until it has been idle a while at which point it
# client unix socket. The spawned child continues to run until it has	# eventually exits and once more the parent picks up the listen.
# been idle a while at which point it eventually exits and once more
# the parent picks up the listen.
#	#
# Parameters:	# Parameters:
# NONE	# NONE
Line 1943 sub parent_clean_up {	Line 2000 sub parent_clean_up {
# Returns:	# Returns:
# NONE	# NONE
#	#
sub listen_on_all_unix_sockets {
Debug(5, "listen_on_all_unix_sockets");
my $host_iterator = &LondConnection::GetHostIterator();
while (!$host_iterator->end()) {
my $host_entry_ref = $host_iterator->get();
my $host_name = $host_entry_ref->[3];
Debug(9, "Listen for $host_name");
&parent_listen($host_name);
$host_iterator->next();
}
}

sub listen_on_common_socket {	sub listen_on_common_socket {
Debug(5, "listen_on_common_socket");	Debug(5, "listen_on_common_socket");
&parent_listen();	&parent_listen();
Line 1979 sub server_died {	Line 2024 sub server_died {
}	}
# need the host to restart:	# need the host to restart:

my $host = $ChildHash{$pid};	my $host = $ChildPid{$pid};
if($host) { # It's for real...	if($host) { # It's for real...
&Debug(9, "Caught sigchild for $host");	&Debug(9, "Caught sigchild for $host");
delete($ChildHash{$pid});	&clear_childpid($pid);
delete($HostToPid{$host});	delete($ChildPid{$pid});
if ($hosts_tab) {	delete($ChildHost{$host});
&parent_listen($host);	&parent_clean_up($host);
} else {
&parent_clean_up($host);
}

} else {	} else {
&Debug(5, "Caught sigchild for pid not in hosts hash: $pid");	&Debug(5, "Caught sigchild for pid not in hosts hash: $pid");
}	}
Line 2045 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;

if ($DieWhenIdle) {	$RemoteHost = "[parent]";
$RemoteHost = "[parent]";	&listen_on_common_socket();
if ($hosts_tab) {
&listen_on_all_unix_sockets();
} else {
&listen_on_common_socket();
}
} else {

while (! $HostIterator->end()) {

my $hostentryref = $HostIterator->get();
CreateChild($hostentryref->[0]);
$HostHash{$hostentryref->[0]} = $hostentryref->[4];
$HostIterator->next();
}
}

$RemoteHost = "Parent Server";	$RemoteHost = "Parent Server";

Line 2072 $RemoteHost = "Parent Server";	Line 2098 $RemoteHost = "Parent Server";
ShowStatus("Parent keeping the flock");	ShowStatus("Parent keeping the flock");


if ($DieWhenIdle) {	# We need to setup a SIGChild event to handle the exit (natural or otherwise)
# We need to setup a SIGChild event to handle the exit (natural or otherwise)	# of the children.
# of the children.

Event->signal(cb => \&server_died,
desc => "Child exit handler",
signal => "CHLD");


# Set up all the other signals we set up. We'll vector them off to the
# same subs as we would for DieWhenIdle false and, if necessary, conditionalize
# the code there.

$parent_handlers{INT} = Event->signal(cb => \&Terminate,
desc => "Parent INT handler",
signal => "INT");
$parent_handlers{TERM} = Event->signal(cb => \&Terminate,
desc => "Parent TERM handler",
signal => "TERM");
if ($hosts_tab) {
$parent_handlers{HUP} = Event->signal(cb => \&Restart,
desc => "Parent HUP handler.",
signal => "HUP");
} else {
$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";


} else {
#
# Set up parent signals:
#

$SIG{INT} = \&Terminate;
$SIG{TERM} = \&Terminate;
if ($hosts_tab) {
$SIG{HUP} = \&Restart;
} else {
$SIG{HUP} = \&KillThemAll;
}
$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);
}
}
}

	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 2167 sub CheckKids {	Line 2153 sub CheckKids {
foreach my $host (keys %parent_dispatchers) {	foreach my $host (keys %parent_dispatchers) {
print $fh "LONC Parent process listening for $host\n";	print $fh "LONC Parent process listening for $host\n";
}	}
foreach my $pid (keys %ChildHash) {	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.
}	}
Line 2211 sub UpdateKids {	Line 2197 sub UpdateKids {
# The down side is transactions that are in flight will get timed out	# The down side is transactions that are in flight will get timed out
# (lost unless they are critical).	# (lost unless they are critical).

if ($hosts_tab) {	&KillThemAll();
&Restart();	LondConnection->ResetReadConfig();
} else {	ShowStatus('Parent keeping the flock');
&KillThemAll();
}
}	}


Line 2224 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");
Line 2248 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.
	# but we need to catch their death and cleanup after them in case this is
	# a restart set of kills
	my @allpids = keys(%ChildPid);
	foreach my $pid (@allpids) {
	my $serving = $ChildPid{$pid};
ShowStatus("Nicely Killing lonc for $serving pid = $pid");	ShowStatus("Nicely Killing lonc for $serving pid = $pid");
Log("CRITICAL", "Nicely Killing lonc for $serving pid = $pid");	Log("CRITICAL", "Nicely Killing lonc for $serving pid = $pid");
kill 'QUIT' => $pid;	kill 'QUIT' => $pid;
	&clear_childpid($pid);
}	}
	ShowStatus("Finished killing child processes off.");
}	}


Line 2266 sub really_kill_them_all_dammit	Line 2258 sub really_kill_them_all_dammit
{	{
Debug(2, "Kill them all Dammit");	Debug(2, "Kill them all Dammit");
local($SIG{CHLD} = 'IGNORE'); # In case some purist reenabled them.	local($SIG{CHLD} = 'IGNORE'); # In case some purist reenabled them.
foreach my $pid (keys %ChildHash) {	foreach my $pid (keys %ChildPid) {
my $serving = $ChildHash{$pid};	my $serving = $ChildPid{$pid};
&ShowStatus("Nastily killing lonc for $serving pid = $pid");	&ShowStatus("Nastily killing lonc for $serving pid = $pid");
Log("CRITICAL", "Nastily killing lonc for $serving pid = $pid");	Log("CRITICAL", "Nastily killing lonc for $serving pid = $pid");
kill 'KILL' => $pid;	kill 'KILL' => $pid;
delete($ChildHash{$pid});	delete($ChildPid{$pid});
	delete($ChildKeyMode{$pid});
my $execdir = $perlvar{'lonDaemons'};	my $execdir = $perlvar{'lonDaemons'};
unlink("$execdir/logs/lonc.pid");	unlink("$execdir/logs/lonc.pid");
}	}
Line 2299 sub Terminate {	Line 2292 sub Terminate {
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 2340 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

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