ipxwrapper/tests/lib/IPXWrapper/Capture/IPXLLC.pm

# IPXWrapper test suite
# Copyright (C) 2017-2023 Daniel Collins <solemnwarning@solemnwarning.net>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 as published by
# the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

use strict;
use warnings;

package IPXWrapper::Capture::IPXLLC;

use Net::Pcap;
use NetPacket::Ethernet;
use NetPacket::IPX;

sub new
{
	my ($class, $dev) = @_;
	
	my $err;
	my $pcap = Net::Pcap::pcap_open_live($dev, 2000, 0, 1, \$err)
		or die("Cannot open device $dev: $err");
	
	Net::Pcap::pcap_setnonblock($pcap, 1, \$err);
	
	return bless(\$pcap, $class);
}

sub read_available
{
	my ($self) = @_;
	
	my @packets = ();
	
	Net::Pcap::pcap_dispatch($$self, -1, sub
	{
		my ($user_data, $header, $packet) = @_;
		
		my $ether = NetPacket::Ethernet->decode($packet);
		
		if($ether->{type} <= 1500 && substr($ether->{data}, 0, 5) eq "\x{E0}\x{E0}\x{03}\x{FF}\x{FF}")
		{
			my $ipx = NetPacket::IPX->decode(substr($ether->{data}, 3));
			
			my %packet = (
				src_mac => $ether->{src_mac},
				dst_mac => $ether->{dest_mac},
				
				tc   => $ipx->{tc},
				type => $ipx->{type},
				
				src_network => $ipx->{src_network},
				src_node    => $ipx->{src_node},
				src_socket  => $ipx->{src_socket},
				
				dst_network => $ipx->{dest_network},
				dst_node    => $ipx->{dest_node},
				dst_socket  => $ipx->{dest_socket},
				
				data => $ipx->{data},
			);
			
			# Skip if the frame length is wrong.
			return if(($ether->{type} - 33) != length($packet{data}));
			
			push(@packets, \%packet);
		}
	}, undef);
	
	return @packets;
}

1;