NetPacket::ICMP(3pm) User Contributed Perl Documentation NetPacket::ICMP(3pm)NAMENetPacket::ICMP - Assemble and disassemble ICMP (Internet Control
Message Protocol) packets.
VERSION
version 1.6.0
SYNOPSIS
use NetPacket::ICMP;
$icmp_obj = NetPacket::ICMP->decode($raw_pkt);
$icmp_pkt = NetPacket::ICMP->encode();
$icmp_data = NetPacket::ICMP::strip($raw_pkt);
DESCRIPTION
"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
tags
The following tags group together related exportable items.
":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
":strip"
Import the strip function "icmp_strip".
":ALL"
All the above exportable items.
EXAMPLE
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
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>
perl v5.20.2 2015-03-13 NetPacket::ICMP(3pm)
