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Man Pages


Manual Reference Pages  -  NETPACKET::IP (3)

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NAME

NetPacket::IP - Assemble and disassemble IP (Internet Protocol) packets.

CONTENTS

VERSION

version 1.4.1

SYNOPSIS



  use NetPacket::IP;

  $ip_obj = NetPacket::IP->decode($raw_pkt);
  $ip_pkt = NetPacket::IP->encode($ip_obj);
  $ip_data = NetPacket::IP::strip($raw_pkt);



DESCRIPTION

NetPacket::IP provides a set of routines for assembling and disassembling packets using IP (Internet Protocol).

    Methods

NetPacket::IP->decode([RAW PACKET]) Decode the raw packet data given and return an object containing instance data. This method will quite happily decode garbage input. It is the responsibility of the programmer to ensure valid packet data is passed to this method.
NetPacket::IP->encode() Return an IP packet encoded with the instance data specified. This will infer the total length of the packet automatically from the payload length and also adjust the checksum.

    Functions

NetPacket::IP::strip([RAW PACKET]) Return the encapsulated data (or payload) contained in the IP packet. This data is suitable to be used as input for other NetPacket::* modules.

This function is equivalent to creating an object using the decode() constructor and returning the data field of that object.

    Instance data

The instance data for the NetPacket::IP object consists of the following fields.
ver The IP version number of this packet.
hlen The IP header length of this packet.
flags The IP header flags for this packet.
foffset The IP fragment offset for this packet.
tos The type-of-service for this IP packet.
len The length (including length of header) in bytes for this packet.
id The identification (sequence) number for this IP packet.
ttl The time-to-live value for this packet.
proto The IP protocol number for this packet.
cksum The IP checksum value for this packet.
src_ip The source IP address for this packet in dotted-quad notation.
dest_ip The destination IP address for this packet in dotted-quad notation.
options Any IP options for this packet.
data The encapsulated data (payload) for this IP packet.

    Exports

default none
exportable IP_PROTO_IP IP_PROTO_ICMP IP_PROTO_IGMP IP_PROTO_IPIP IP_PROTO_TCP IP_PROTO_UDP IP_VERSION_IPv4
tags The following tags group together related exportable items.
:protos IP_PROTO_IP IP_PROTO_ICMP IP_PROTO_IGMP IP_PROTO_IPIP IP_PROTO_TCP IP_PROTO_UDP
:versions IP_VERSION_IPv4
:strip Import the strip function ip_strip.
:ALL All the above exportable items.

EXAMPLE

The following script dumps IP frames by IP address and protocol to standard output.



  #!/usr/bin/perl -w

  use strict;
  use Net::PcapUtils;
  use NetPacket::Ethernet qw(:strip);
  use NetPacket::IP;

  sub process_pkt {
      my ($user, $hdr, $pkt) = @_;

      my $ip_obj = NetPacket::IP->decode(eth_strip($pkt));
      print("$ip_obj->{src_ip}:$ip_obj->{dest_ip} $ip_obj->{proto}\n");
  }

  Net::PcapUtils::loop(\&process_pkt, FILTER => ip);



TODO

IP option decoding - currently stored in binary form.
Assembly of received fragments

COPYRIGHT

Copyright (c) 2001 Tim Potter and Stephanie Wehner.

Copyright (c) 1995,1996,1997,1998,1999 ANU and CSIRO on behalf of the participants in the CRC for Advanced Computational Systems (’ACSys’).

This module is free software. You can redistribute it and/or modify it under the terms of the Artistic License 2.0.

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.

AUTHOR

Tim Potter <tpot@samba.org>

Stephanie Wehner <atrak@itsx.com>

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