NetPacket::IGMP - Assemble and disassemble IGMP (Internet Group Management Protocol) packets.

       Tim Potter <tpot@samba.org>

perl v5.36.0                                       2022-11-19                               NetPacket::IGMP(3pm)

       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.

       "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.

   Instancedata
       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.

       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');

       NetPacket::IGMP - Assemble and disassemble IGMP (Internet Group Management Protocol) packets.

         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);

       Implement encode() function

       version 1.7.2