NetPacket::IGMP(3pm)

Usage

  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);

Version

version 1.7.2

Overview

"NetPacket::IGMP" provides a set of routines for assembling and disassembling packets using IGMP (Internet Group Management 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

Examples

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

Releases

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

6.0
7
8
9
10
11
12–13