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8.4

Proxy script using IO::Async won't loop.

Asked by Wibble_ in Perl Programming Language, CGI Scripting, Web Authoring

Tags: perl, proxy, script, IO::Async

I'm trying to write a proxy script that looks at the incoming traffic, and either identifies it as XMLRPC, or not, and proxies it to either an XMLRPC server or to another server.

The problem I have is that I can't seem to identify the traffic before i have to make the second outgoing connection.

I'm sure that I'm missing something obvious, but i can't find it.

If you take out the if ( defined $connect_host{$p} ) loop it works, but it connects to the outgoing server before identifying the traffic (which is no good, as we need to identify before we connect, as the services operate on different ports.)

I've been trying to get this working for about 12 hours now, and it's driving me around the bend.

Any pointers would be hugely appreciated. :-)

W.

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             #!/usr/bin/perl
use strict;
use warnings;
 
use IO::Async::Loop;
use IO::Async::Stream;
 
our $LOGLEVEL = 4; # 1-Error, 2-Warn, 3-info, 4-debug, 5-silly
 
my $LISTEN_PORT = 3389;
my $CONNECT_HOST = "10.0.0.64"; #- to be replaced
my $CONNECT_PORT = 1080; #- to be replaced 
 
my %stream1 = ();
my %stream2 = ();
my %connect_port = (); 
my %connect_host = ();
 
my $loop = IO::Async::Loop->new;
 
 
$loop->listen
(
	service	=> $LISTEN_PORT,
	socktype => 'stream',
 
	on_accept => sub 
	{
		my ( $socket1 ) = @_;
 
		# $socket is just an IO::Socket reference
		my $p = $socket1->peerhost . ":" . $socket1->peerport;
		
		wlog(3,"New connection from $p");
 
		##############################################
		$stream1{$p} = IO::Async::Stream->new
		(
			handle => $socket1,
 
			on_read => sub 
			{
				my ( $self, $buffref, $closed ) = @_;
				if( $$buffref =~ /RPC2/ ) 
				{
					wlog (3,"XMLRPC detected");
					($connect_host{$p},$connect_port{$p}) = xmlrpc($$buffref);
					wlog(4,"host:" . $connect_host{$p} . " port:" . $connect_port{$p});
				}
				# Just copy all the data
				if (defined $stream2{$p})
				{
					$stream2{$p}->write( $$buffref ); $$buffref = "";
				}
				return 0;
			},
			on_closed => sub 
			{
				$stream2{$p}->close_when_empty;
				delete $stream2{$p};
				wlog(3,"Connection from $p closed");
			},
		);
		$loop->add( $stream1{$p} );
		##############################################
		wlog(4,"MARK: if defined connect_host");
		if ( defined $connect_host{$p} )
		{
			wlog(4,"MARK: Start of loop->connect");
			wlog(4,"connect_host set to". $connect_host{$p}) if defined $connect_host{$p};
			$loop->connect(
				host	=> $CONNECT_HOST, #should be $connect_host{$p}
				service => $CONNECT_PORT, #should be $connect_port{$p}
	
				on_connected => sub 
				{
					my ( $socket2 ) = @_;
	
					$stream2{$p} = IO::Async::Stream->new
					(
						handle => $socket2,
	
						on_read => sub 
						{
							my ( $self, $buffref, $closed ) = @_;
							# Just copy all the data
							$stream1{$p}->write( $$buffref ); $$buffref = "";
							return 0;
						},
						on_closed => sub 
						{
							$stream1{$p}->close_when_empty;
							wlog(3,"Connection to $CONNECT_HOST:$CONNECT_PORT closed");
						},
					);
	
					#$loop->add( $stream1{$p} );
					$loop->add( $stream2{$p} );
				},
	
				on_resolve_error => sub { wlog(1,"Cannot resolve - $_[0]"); },
				on_connect_error => sub { wlog(1,"Cannot connect"); },
			);
		}
		#############################################
	},
 
	on_resolve_error => sub { wlog(1,"Cannot resolve - $_[0]"); die;},
	on_listen_error  => sub { wlog(1,"Cannot listen"); die; },
);
 
$loop->loop_forever;
 
sub wlog
{
	my ($level,$msg) = @_;
	if ($LOGLEVEL >= $level)
	{
		#for now print to sderror.
		print STDERR $msg . "\n";
	}
}
 
sub xmlrpc
{
	my $input = @_;
	#magic goes here
	return ("10.0.0.64", 1080);
}

           
         

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Proxy script using IO::Async won't loop.

Asked by Wibble_ in Perl Programming Language, CGI Scripting, Web Authoring

Tags: perl, proxy, script, IO::Async

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