This file is indexed.

/usr/share/perl5/NetPacket/IGMP.pm is in libnetpacket-perl 1.3.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
#
# NetPacket::IGMP - Decode and encode IGMP (Internet Group Management
# Protocol) packets.

package NetPacket::IGMP;
BEGIN {
  $NetPacket::IGMP::AUTHORITY = 'cpan:YANICK';
}
{
  $NetPacket::IGMP::VERSION = '1.3.0';
}
# ABSTRACT: Assemble and disassemble IGMP (Internet Group Mangement Protocol) packets. 


use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);

BEGIN {
    @ISA = qw(Exporter NetPacket);

# Items to export into callers namespace by default
# (move infrequently used names to @EXPORT_OK below)

    @EXPORT = qw(
    );

# Other items we are prepared to export if requested

    @EXPORT_OK = qw(igmp_strip
		    IGMP_VERSION_RFC998 IGMP_VERSION_RFC1112
		    IGMP_MSG_HOST_MQUERY IGMP_MSG_HOST_MREPORT
		    IGMP_IP_NO_HOSTS IGMP_IP_ALL_HOSTS
		    IGMP_IP_ALL_ROUTERS
    );

# Tags:

    %EXPORT_TAGS = (
    ALL         => [@EXPORT, @EXPORT_OK],
    strip       => [qw(igmp_strip)],
    versions    => [qw(IGMP_VERSION_RFC998 IGMP_VERSION_RFC1112)],
    msgtypes    => [qw(IGMP_HOST_MQUERY IGMP_HOST_MREPORT)],
    group_addrs => [qw(IGMP_IP_NO_HOSTS IGMP_IP_ALL_HOSTS
		      IGMP_IP_ALL_ROUTERS)]  
);

}

#
# Version numbers
#

use constant IGMP_VERSION_RFC998  => 0;      # Version 0 of IGMP (obsolete)
use constant IGMP_VERSION_RFC1112 => 1;      # Version 1 of IGMP

#
# Message types
#

use constant IGMP_MSG_HOST_MQUERY  => 1;      # Host membership query
use constant IGMP_MSG_HOST_MREPORT => 2;      # Host membership report

#
# IGMP IP addresses
#

use constant IGMP_IP_NO_HOSTS    => '224.0.0.0';     # Not assigned to anyone
use constant IGMP_IP_ALL_HOSTS   => '224.0.0.1';     # All hosts on local net
use constant IGMP_IP_ALL_ROUTERS => '224.0.0.2';     # All routers on local net

# Convert 32-bit IP address to "dotted quad" notation

sub to_dotquad {
    my($net) = @_ ;
    my($na, $nb, $nc, $nd);

    $na = $net >> 24 & 255;
    $nb = $net >> 16 & 255;
    $nc = $net >>  8 & 255;
    $nd = $net & 255;

    return ("$na.$nb.$nc.$nd");
}

#
# Decode the packet
#

sub decode {
    my $class = shift;
    my($pkt, $parent, @rest) = @_;
    my $self = {};

    # Class fields

    $self->{_parent} = $parent;
    $self->{_frame} = $pkt;

    # Decode IGMP packet

    if (defined($pkt)) {
	my $tmp;

	($tmp, $self->{subtype}, $self->{cksum}, $self->{group_addr}, 
	 $self->{data}) = unpack('CCnNa*', $pkt);
    
	# Extract bit fields
	
	$self->{version} = ($tmp & 0xf0) >> 4;
	$self->{type} = $tmp & 0x0f;
	
	# Convert to dq notation
	
	$self->{group_addr} = to_dotquad($self->{group_addr});
    }

    # Return a blessed object

    bless($self, $class);
    return $self;
}

#
# Strip header from packet and return the data contained in it.  IGMP 
# packets contain no encapsulated data.
#

undef &igmp_strip;
*igmp_strip = \&strip;

sub strip {
    return undef;
}

#
# Encode a packet
#

sub encode {
    die("Not implemented");
}

# Module return value

1;

# autoloaded methods go after the END token (&& pod) below



=pod

=head1 NAME

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

=head1 VERSION

version 1.3.0

=head1 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);

=head1 DESCRIPTION

C<NetPacket::IGMP> provides a set of routines for assembling and
disassembling packets using IGMP (Internet Group Mangement Protocol). 

=head2 Methods

=over

=item C<NetPacket::IGMP-E<gt>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.

=item C<NetPacket::IGMP-E<gt>encode(param =E<gt> value)>

Return an IGMP packet encoded with the instance data specified.  Not
implemented.

=back

=head2 Functions

=over

=item C<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.

=back

=head2 Instance data

The instance data for the C<NetPacket::IGMP> object consists of
the following fields.

=over

=item version

The IGMP version of this packet.

=item type

The message type for this packet.

=item len

The length (including length of header) in bytes for this packet.

=item subtype

The message subtype for this packet.

=item cksum

The checksum for this packet.

=item group_addr

The group address specified in this packet.

=item data

The encapsulated data (payload) for this packet.

=back

=head2 Exports

=over

=item default

none

=item 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 

=item tags

The following tags group together related exportable items.

=over

=item C<:strip>

Import the strip function C<igmp_strip>.

=item C<:versions>

IGMP_VERSION_RFC998 IGMP_VERSION_RFC1112

=item C<:msgtypes>

IGMP_HOST_MQUERY IGMP_HOST_MREPORT

=item C<:group_addrs>

IGMP_IP_NO_HOSTS IGMP_IP_ALL_HOSTS IGMP_IP_ALL_ROUTERS

=item C<:ALL>

All the above exportable items.

=back

=back

=head1 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');

=head1 TODO

=over

=item Implement encode() function

=back

=head1 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.

=head1 AUTHOR

Tim Potter E<lt>tpot@samba.orgE<gt>

=cut


__END__


# any real autoloaded methods go after this line