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lib/Arc/Connection.pm  view on Meta::CPAN

			timeout => undef,  # timeout for all connections (ARCv2 and command) in seconds
			service => undef,  # name of the server (for SASL)
	};
}

sub _Init
{
	my $this = shift;
		 
	return $this->_SetError("Initialization failed.") unless $this->SUPER::_Init(@_);
	
	# timeout
#	unless (defined $this->{timeout}) {
#		$this->Log(LOG_SIDE,"Setting timeout to 30 secs since no time specified.");
#		$this->{timeout} = 30;
#	}		  
	
	return $this->_SetError("No service name for SASL authentication specified.") 
		unless defined $this->{service};
		
	return 1; 
}

## initializes command connection. (protocol)
## Starts listen on the Command socket and sends the B<CMDPASV> command.
##out> true if everything went like expected, otherwise false.
##eg> $this->_CommandConnection();
sub _CommandConnection
{
	my $this = shift;

	my $consock = IO::Socket::INET->new(
				Listen    => 1,
				Proto     => 'tcp',
				LocalAddr => $this->{_connection}->sockhost,
				ReuseAddr => 1,
	) || return $this->_SetError("Socket creation for CommandConnection failed.");

	unless ($this->_SendCommand("CMDPASV",$consock->sockhost.':'.$consock->sockport)) {
		return;
	}

	my $sel = new IO::Select($consock);

	if (my @socks = $sel->can_read(10)) {
		foreach my $sock (@socks) {
			if ($sock == $consock) {
				$this->{_cmdclientsock} = $consock->accept() || last;
				return 1;
			}
		}
	} else {
		return $this->_SetError("No CommandConnection received (Client died?).");
	}	
}

## function for reading and writing on the command connection.
## This function is always used by the C<Arc::Connection::Server> to handle 
## command data. When calling the C<ProcessCommand> from C<Arc::Connection::Client> 
## this function is also used.
## Data is read from the local socket resp. pipe and is written encrypted 
## to the network socket. The other side reads the data from network socket, 
## decrypts it and writes it to its local socket. This function behaves differently on 
## client and server sides, when the local or network socket is closed.
##in> *locfdin, *locfdout
##out> always true
##eg> $this->ReadWriteBinary(*STDIN,*STDOUT);
sub _ReadWriteBinary
{
	my $this = shift;
	my $locin = shift;
	my $locout = shift;
	my $client = ref ($this) eq "Arc::Connection::Client";
	my $netsock = $this->{_cmdclientsock};
	
#	$this->_Debug("ReadWriteBinary (C:",$client,") locin: ",$locin->fileno,", locout:",$locout->fileno,", net: ",$netsock->fileno);
	my $sel = new IO::Select($netsock,$locin);
	my $lwsel = new IO::Select($locout);
	my $nwsel = new IO::Select($netsock);

	my $buf;
	my $stop = 0;
	while (my @rs = $sel->can_read) {
		foreach my $r (@rs) {
			# Something is readable.
			my $ret = $r->sysread($buf,4096);
			# If no data received, this read socket is closed
			# We don't want to listen to it anymore
			unless ($ret) {
				$sel->remove($r);
				# If there is nothing to read anymore
				# we will never write to the other socket again.
				if ($r->fileno == $locin->fileno) {
					$stop = 1 unless $client;
					shutdown($netsock,1); # Close write connection
				} elsif ($r->fileno == $netsock->fileno) {
					# on client-side the netsock is closed only
					# if the command on server side has ended.
					# so game over
					$stop = 1 if $client;
					close($locout) unless $stop; # Local pipe is not needed anymore
				}
				
				last if $stop;
			} else {
				# select the appropriate write-"select"
				my $tsel = $r->fileno == $locin->fileno ? $nwsel : $lwsel;
				# encryption, decode or encode
				$buf = $r->fileno == $locin->fileno ? 
						$this->{_sasl}->encode($buf) : 
						$this->{_sasl}->decode($buf); 

				# sometimes SASL replies NULL if something is missing	
				# this is normal behaviour, the next buf will complete it 
				next unless $buf; 
			
				# if nothing is writeable, gameover
				last unless (my @ws = $tsel->can_write);
				last unless ($ws[0]->syswrite($buf));
			}
		}