NetPacket::IGMP(3pm) User Contributed Perl Documentation NetPacket::IGMP(3pm)NAMENetPacket::IGMP - Assemble and disassemble IGMP (Internet Group
Mangement Protocol) packets.
VERSION
version 1.6.0
SYNOPSIS
use NetPacket::IGMP;
$igmp_obj = NetPacket::IGMP->decode($raw_pkt);
$igmp_pkt = NetPacket::IGMP->encode(params...); # Not implemented
$igmp_data = NetPacket::IGMP::strip($raw_pkt);
DESCRIPTION
"NetPacket::IGMP" provides a set of routines for assembling and
disassembling packets using IGMP (Internet Group Mangement Protocol).
Methods
"NetPacket::IGMP->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::IGMP->encode(param => value)"
Return an IGMP packet encoded with the instance data specified.
Not implemented.
Functions
"NetPacket::IGMP::strip([RAW PACKET])"
Return the encapsulated data (or payload) contained in the IGMP
packet. This function returns undef as there is no encapsulated
data in an IGMP packet.
Instance data
The instance data for the "NetPacket::IGMP" object consists of the
following fields.
version
The IGMP version of this packet.
type
The message type for this packet.
len The length (including length of header) in bytes for this packet.
subtype
The message subtype for this packet.
cksum
The checksum for this packet.
group_addr
The group address specified in this packet.
data
The encapsulated data (payload) for this packet.
Exports
default
none
exportable
IGMP_VERSION_RFC998 IGMP_VERSION_RFC1112 IGMP_HOST_MQUERY
IGMP_HOST_MREPORT IGMP_IP_NO_HOSTS IGMP_IP_ALL_HOSTS
IGMP_IP_ALL_ROUTERS
tags
The following tags group together related exportable items.
":strip"
Import the strip function "igmp_strip".
":versions"
IGMP_VERSION_RFC998 IGMP_VERSION_RFC1112
":msgtypes"
IGMP_HOST_MQUERY IGMP_HOST_MREPORT
":group_addrs"
IGMP_IP_NO_HOSTS IGMP_IP_ALL_HOSTS IGMP_IP_ALL_ROUTERS
":ALL"
All the above exportable items.
EXAMPLE
The following script dumps UDP frames by IP address and UDP port to
standard output.
#!/usr/bin/perl -w
use strict;
use Net::PcapUtils;
use NetPacket::Ethernet qw(:strip);
use NetPacket::IP;
use NetPacket::IGMP;
sub process_pkt {
my($arg, $hdr, $pkt) = @_;
my $ip_obj = NetPacket::IP->decode(eth_strip($pkt));
my $igmp_obj = NetPacket::IGMP->decode($ip_obj->{data});
print("$ip_obj->{src_ip} -> $ip_obj->{dest_ip} ",
"$igmp_obj->{type}/$igmp_obj->{subtype} ",
"$igmp_obj->{group_addr}\n");
}
Net::PcapUtils::loop(\&process_pkt, FILTER => 'igmp');
TODO
Implement encode() function
COPYRIGHT
Copyright (c) 2001 Tim Potter.
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>
perl v5.20.2 2015-03-13 NetPacket::IGMP(3pm)
