NAME

Net::Packet::IGMPv4 - Internet Group Management Protocol v4 layer 4 object

SYNOPSIS

   use Net::Packet::Consts qw(:igmpv4);
   require Net::Packet::IGMPv4;

   # Build a layer
   my $layer = Net::Packet::IGMPv4->new(
      version      => 2,
      type         => NP_IGMPv4_v2_TYPE_QUERY,
      maxRespTime  => 10,
      checksum     => 0,
      groupAddress => NP_IGMPv4_GROUP_ADDRESS_ALL_HOSTS,
   );
   $layer->pack;

   print 'RAW: '.unpack('H*', $layer->raw)."\n";

   # Read a raw layer
   my $layer = Net::Packet::IGMPv4->new(raw => $raw);

   print $layer->print."\n";
   print 'PAYLOAD: '.unpack('H*', $layer->payload)."\n"
      if $layer->payload;

DESCRIPTION

This modules implements the encoding and decoding of the Internet Group Management Protocol v4 (version 1 and 2) layer.

RFC for version 1: ftp://ftp.rfc-editor.org/in-notes/rfc1112.txt

RFC for version 2: ftp://ftp.rfc-editor.org/in-notes/rfc2236.txt

See also Net::Packet::Layer and Net::Packet::Layer4 for other attributes and methods.

ATTRIBUTES

version - 4 bits (or 0 for version 2)
type - 4 bits (or 8 bits for version 2)
unused - 8 bits (or 0 for version 2)
maxRespTime - 8 bits (or 0 for version 1)
checksum - 16 bits
groupAddress - 32 bits: For version 1, you use the following attributes: version, type, unused, checksum, groupAddress.
For version 2, you use the following attributes: type, maxRespTime, checksum, groupAddress.

METHODS

new

Object constructor. You can pass attributes that will overwrite default ones. Default values:

version: 2

type: NP_IGMPv4_v2_TYPE_QUERY

maxRespTime: 10

checksum: 0

groupAddress: NP_IGMPv4_GROUP_ADDRESS_ALL_HOSTS

pack

Packs all attributes into a raw format, in order to inject to network. Returns 1 on success, undef otherwise.

unpack

Unpacks raw data from network and stores attributes into the object. Returns 1 on success, undef otherwise.

CONSTANTS

Load them: use Net::Packet::Consts qw(:igmpv4);

NP_IGMPv4_HDR_LEN: IGMPv4 header length.
NP_IGMPv4_v1_TYPE_QUERY
NP_IGMPv4_v1_TYPE_REPORT: Various types supported by version 1 of the protocol.
NP_IGMPv4_v2_TYPE_QUERY
NP_IGMPv4_v2_TYPE_QUERY_v1
NP_IGMPv4_v2_TYPE_REPORT
NP_IGMPv4_v2_TYPE_LEAVE_GROUP: Various types supported by version 2 of the protocol.
NP_IGMPv4_GROUP_ADDRESS_NO_HOSTS
NP_IGMPv4_GROUP_ADDRESS_ALL_HOSTS
NP_IGMPv4_GROUP_ADDRESS_ALL_ROUTERS: Various group addresses supported by all versions of the protocol.

AUTHOR

Patrice <GomoR> Auffret

COPYRIGHT AND LICENSE

You may distribute this module under the terms of the Artistic license. See LICENSE.Artistic file in the source distribution archive.

RELATED MODULES

NetPacket, Net::RawIP, Net::RawSock