NetPacket::ICMP(3pm)

Usage

  use NetPacket::ICMP;
  $icmp_obj = NetPacket::ICMP->decode($raw_pkt);
  $icmp_pkt = NetPacket::ICMP->encode();
  $icmp_data = NetPacket::ICMP::strip($raw_pkt);

Version

version 1.7.2

Overview

"NetPacket::ICMP" provides a set of routines for assembling and disassembling packets using ICMP (Internet Control Message Protocol).

Methods

"NetPacket::ICMP->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::ICMP->encode()": Return an ICMP packet encoded with the instance data specified.

Functions

"NetPacket::ICMP::strip([RAW PACKET])": Return the encapsulated data (or payload) contained in the ICMP packet.

Instance data

The instance data for the "NetPacket::ICMP" object consists of the following fields.

`type`	The ICMP message type of this packet.
`code`	The ICMP message code of this packet.
`cksum`	The checksum for this packet.
`data`	The encapsulated data (payload) for this packet.

Exports

default: none

exportable: ICMP message types:
ICMP_ECHOREPLY ICMP_UNREACH ICMP_SOURCEQUENCH
ICMP_REDIRECT ICMP_ECHO ICMP_ROUTERADVERT
ICMP_ROUTERSOLICIT ICMP_TIMXCEED ICMP_PARAMPROB
ICMP_TSTAMP ICMP_TSTAMPREPLY ICMP_IREQ ICMP_IREQREPLY
ICMP_MASKREQ ICMP_MASKREPLY

Examples

The following example prints the ICMP type, code, and checksum fields.

  #!/usr/bin/perl -w
  use strict;
  use Net::PcapUtils;
  use NetPacket::Ethernet qw(:strip);
  use NetPacket::IP qw(:strip);
  use NetPacket::ICMP;
  sub process_pkt {
      my ($user, $hdr, $pkt) = @_;
      my $ip_obj = NetPacket::IP->decode(eth_strip($pkt));
      my $icmp_obj = NetPacket::ICMP->decode(ip_strip($ip_obj));
      print("Type: $icmp_obj->{type}\n");
      print("Code: $icmp_obj->{code}\n");
      print("Checksum: $icmp_obj->{cksum}\n\n");
  }
  Net::PcapUtils::loop(\&process_pkt, FILTER => 'icmp');

Todo

Create constants

Releases

8 releases since Debian 6.0 (Squeeze); the text changed 6 times.

6.0
7
8
9
10
11
12–13