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#!/usr/bin/perl
#
# $Id: UDPPacket.pm,v 1.4 2001/10/06 22:19:14 levine Exp $
#
# Copyright (C) 2001 James D. Levine (jdl@vinecorp.com)
#
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
#
####################################################################
use NWatch::Packet;
use strict;
####################################################################
#
# udp_packet
#
# Decodes udp fields.
#
####################################################################
package NWatch::udp_packet;
@NWatch::udp_packet::ISA = qw( NWatch::packet );
sub protocol_name { "udp"; }
sub new
{
my( $classtype, $data ) = @_;
# init from base class
my $self = NWatch::packet::new( $classtype, $data );
# unpack fields
my( $source_port, $destination_port, $length, $checksum ) = unpack "nnnn", $data;
# print "udp_packet: entry \n";
$self->set( "source_port", $source_port );
$self->set( "destination_port", $destination_port );
$self->set( "length", $length );
$self->set( "checksum", $checksum );
$self->set( "payload", substr( $data, 9, length( $data ) -9 ) ) if length( $data ) > 8;
# print "udp source $source_port dest $destination_port length $length checksum $checksum \n";
$self;
}
1;
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