1NetPacket::IGMP(3)    User Contributed Perl Documentation   NetPacket::IGMP(3)
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NAME

6       NetPacket::IGMP - Assemble and disassemble IGMP (Internet Group
7       Mangement Protocol) packets.
8

VERSION

10       version 1.7.1
11

SYNOPSIS

13         use NetPacket::IGMP;
14
15         $igmp_obj = NetPacket::IGMP->decode($raw_pkt);
16         $igmp_pkt = NetPacket::IGMP->encode(params...);   # Not implemented
17         $igmp_data = NetPacket::IGMP::strip($raw_pkt);
18

DESCRIPTION

20       "NetPacket::IGMP" provides a set of routines for assembling and
21       disassembling packets using IGMP (Internet Group Mangement Protocol).
22
23   Methods
24       "NetPacket::IGMP->decode([RAW PACKET])"
25           Decode the raw packet data given and return an object containing
26           instance data.  This method will quite happily decode garbage
27           input.  It is the responsibility of the programmer to ensure valid
28           packet data is passed to this method.
29
30       "NetPacket::IGMP->encode(param => value)"
31           Return an IGMP packet encoded with the instance data specified.
32           Not implemented.
33
34   Functions
35       "NetPacket::IGMP::strip([RAW PACKET])"
36           Return the encapsulated data (or payload) contained in the IGMP
37           packet.  This function returns undef as there is no encapsulated
38           data in an IGMP packet.
39
40   Instance data
41       The instance data for the "NetPacket::IGMP" object consists of the
42       following fields.
43
44       version
45           The IGMP version of this packet.
46
47       type
48           The message type for this packet.
49
50       len The length (including length of header) in bytes for this packet.
51
52       subtype
53           The message subtype for this packet.
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55       cksum
56           The checksum for this packet.
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58       group_addr
59           The group address specified in this packet.
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61       data
62           The encapsulated data (payload) for this packet.
63
64   Exports
65       default
66           none
67
68       exportable
69           IGMP_VERSION_RFC998 IGMP_VERSION_RFC1112 IGMP_HOST_MQUERY
70           IGMP_HOST_MREPORT IGMP_IP_NO_HOSTS IGMP_IP_ALL_HOSTS
71           IGMP_IP_ALL_ROUTERS
72
73       tags
74           The following tags group together related exportable items.
75
76           ":strip"
77               Import the strip function "igmp_strip".
78
79           ":versions"
80               IGMP_VERSION_RFC998 IGMP_VERSION_RFC1112
81
82           ":msgtypes"
83               IGMP_HOST_MQUERY IGMP_HOST_MREPORT
84
85           ":group_addrs"
86               IGMP_IP_NO_HOSTS IGMP_IP_ALL_HOSTS IGMP_IP_ALL_ROUTERS
87
88           ":ALL"
89               All the above exportable items.
90

EXAMPLE

92       The following script dumps UDP frames by IP address and UDP port to
93       standard output.
94
95         #!/usr/bin/perl -w
96
97         use strict;
98         use Net::PcapUtils;
99         use NetPacket::Ethernet qw(:strip);
100         use NetPacket::IP;
101         use NetPacket::IGMP;
102
103         sub process_pkt {
104             my($arg, $hdr, $pkt) = @_;
105
106             my $ip_obj = NetPacket::IP->decode(eth_strip($pkt));
107             my $igmp_obj = NetPacket::IGMP->decode($ip_obj->{data});
108
109             print("$ip_obj->{src_ip} -> $ip_obj->{dest_ip} ",
110                   "$igmp_obj->{type}/$igmp_obj->{subtype} ",
111                   "$igmp_obj->{group_addr}\n");
112         }
113
114         Net::PcapUtils::loop(\&process_pkt, FILTER => 'igmp');
115

TODO

117       Implement encode() function
118

120       Copyright (c) 2001 Tim Potter.
121
122       Copyright (c) 1995,1996,1997,1998,1999 ANU and CSIRO on behalf of the
123       participants in the CRC for Advanced Computational Systems ('ACSys').
124
125       This module is free software.  You can redistribute it and/or modify it
126       under the terms of the Artistic License 2.0.
127
128       This program is distributed in the hope that it will be useful, but
129       without any warranty; without even the implied warranty of
130       merchantability or fitness for a particular purpose.
131

AUTHOR

133       Tim Potter <tpot@samba.org>
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137perl v5.28.2                      2019-06-08                NetPacket::IGMP(3)
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