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- Committer: Bazaar Package Importer
- Author(s): Benoit Mortier
- Date: 2009-11-21 15:18:28 UTC
- mfrom: (1.1.1 upstream)
- Revision ID: james.westby@ubuntu.com-20091121151828-2jq4kk0shmm0ti3e
Tags: 0.41.1-1
New Upstream Version (Closes: #557161)
added
removed
NetPacket/ICMP.pm
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#
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# NetPacket::ICMP -Decode and encode ICMP (Internet Control Message
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# Protocol) packets.
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#
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# Comments/suggestions to tpot@samba.org
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#
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# Encode and checksum by Stephanie Wehner <atrak@itsx.com>
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#
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# $Id: ICMP.pm,v 1.11 2001/07/29 23:45:00 tpot Exp $
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#
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package NetPacket::ICMP;
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#
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# Copyright (c) 2001 Tim Potter.
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#
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# This package is free software and is provided "as is" without express
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# or implied warranty. It may be used, redistributed and/or modified
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# under the terms of the Perl Artistic License (see
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# http://www.perl.com/perl/misc/Artistic.html)
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#
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# Copyright (c) 1995,1996,1997,1998,1999 ANU and CSIRO on behalf of
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# the participants in the CRC for Advanced Computational Systems
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# ('ACSys').
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#
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# ACSys makes this software and all associated data and documentation
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# ('Software') available free of charge. You may make copies of the
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# Software but you must include all of this notice on any copy.
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#
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# The Software was developed for research purposes and ACSys does not
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# warrant that it is error free or fit for any purpose. ACSys
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# disclaims any liability for all claims, expenses, losses, damages
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# and costs any user may incur as a result of using, copying or
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# modifying the Software.
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#
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# Copyright (c) 2001 Stephanie Wehner
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#
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use strict;
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use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
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my $myclass;
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BEGIN {
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$myclass = __PACKAGE__;
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$VERSION = "0.04";
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}
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sub Version () { "$myclass v$VERSION" }
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BEGIN {
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@ISA = qw(Exporter NetPacket);
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# Items to export into callers namespace by default
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# (move infrequently used names to @EXPORT_OK below)
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@EXPORT = qw(
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);
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# Other items we are prepared to export if requested
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@EXPORT_OK = qw(icmp_strip
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ICMP_ECHOREPLY ICMP_UNREACH ICMP_SOURCEQUENCH
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ICMP_REDIRECT ICMP_ECHO ICMP_ROUTERADVERT
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ICMP_ROUTERSOLICIT ICMP_TIMXCEED ICMP_PARAMPROB
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ICMP_TSTAMP ICMP_TSTAMPREPLY ICMP_IREQ ICMP_IREQREPLY
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ICMP_MASREQ ICMP_MASKREPLY
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);
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# Tags:
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%EXPORT_TAGS = (
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ALL => [@EXPORT, @EXPORT_OK],
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types => [qw(ICMP_ECHOREPLY ICMP_UNREACH ICMP_SOURCEQUENCH
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ICMP_REDIRECT ICMP_ECHO ICMP_ROUTERADVERT
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ICMP_ROUTERSOLICIT ICMP_TIMXCEED ICMP_PARAMPROB
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ICMP_TSTAMP ICMP_TSTAMPREPLY ICMP_IREQ ICMP_IREQREPLY
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ICMP_MASREQ ICMP_MASKREPLY)],
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strip => [qw(icmp_strip)],
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);
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}
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# ICMP Types
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use constant ICMP_ECHOREPLY => 0;
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use constant ICMP_UNREACH => 3;
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use constant ICMP_SOURCEQUENCH => 4;
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use constant ICMP_REDIRECT => 5;
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use constant ICMP_ECHO => 8;
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use constant ICMP_ROUTERADVERT => 9;
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use constant ICMP_ROUTERSOLICIT => 10;
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use constant ICMP_TIMXCEED => 11;
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use constant ICMP_PARAMPROB => 12;
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use constant ICMP_TSTAMP => 13;
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use constant ICMP_TSTAMPREPLY => 14;
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use constant ICMP_IREQ => 15;
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use constant ICMP_IREQREPLY => 16;
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use constant ICMP_MASKREQ => 17;
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use constant ICMP_MASKREPLY => 18;
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#
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# Decode the packet
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#
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sub decode {
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my $class = shift;
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my($pkt, $parent, @rest) = @_;
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my $self = {};
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# Class fields
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$self->{_parent} = $parent;
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$self->{_frame} = $pkt;
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# Decode ICMP packet
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if (defined($pkt)) {
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($self->{type}, $self->{code}, $self->{cksum}, $self->{data}) =
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unpack("CCna*", $pkt);
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}
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# Return a blessed object
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bless($self, $class);
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return $self;
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}
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#
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# Strip a packet of its header and return the data
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#
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undef &icmp_strip;
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*icmpstrip = \&strip;
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sub strip {
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my ($pkt, @rest) = @_;
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my $icmp_obj = decode($pkt);
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return $icmp_obj->data;
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}
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#
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# Encode a packet
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#
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sub encode {
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my $self = shift;
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my ($ip) = @_;
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my ($packet);
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# Checksum the packet
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$self->checksum();
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# Put the packet together
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$packet = pack("CCna*", $self->{type}, $self->{code},
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$self->{cksum}, $self->{data});
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return($packet);
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}
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#
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# Calculate ICMP checksum
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sub checksum {
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my $self = shift;
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my ($ip) = @_;
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my ($packet,$zero);
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# Put the packet together for checksumming
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$zero = 0;
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$packet = pack("CCna*", $self->{type}, $self->{code},
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$zero, $self->{data});
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$self->{cksum} = NetPacket::htons(NetPacket::in_cksum($packet));
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}
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#
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# Module initialisation
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#
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1;
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# autoloaded methods go after the END token (&& pod) below
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__END__
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=head1 NAME
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C<NetPacket::ICMP> - Assemble and disassemble ICMP (Internet Control
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Message Protocol) packets.
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=head1 SYNOPSIS
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use NetPacket::ICMP;
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$icmp_obj = NetPacket::ICMP->decode($raw_pkt);
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$icmp_pkt = NetPacket::ICMP->encode();
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$icmp_data = NetPacket::ICMP::strip($raw_pkt);
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=head1 DESCRIPTION
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C<NetPacket::ICMP> provides a set of routines for assembling and
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disassembling packets using ICMP (Internet Control Message Protocol).
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=head2 Methods
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=over
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=item C<NetPacket::ICMP-E<gt>decode([RAW PACKET])>
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Decode the raw packet data given and return an object containing
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instance data. This method will quite happily decode garbage input.
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It is the responsibility of the programmer to ensure valid packet data
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is passed to this method.
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=item C<NetPacket::ICMP-E<gt>encode()>
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Return an ICMP packet encoded with the instance data specified.
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=back
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=head2 Functions
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=over
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=item C<NetPacket::ICMP::strip([RAW PACKET])>
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Return the encapsulated data (or payload) contained in the ICMP
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packet.
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=back
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=head2 Instance data
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The instance data for the C<NetPacket::ICMP> object consists of
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the following fields.
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=over
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=item type
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The ICMP message type of this packet.
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=item code
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The ICMP message code of this packet.
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=item cksum
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The checksum for this packet.
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=item data
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The encapsulated data (payload) for this packet.
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=back
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=head2 Exports
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=over
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=item default
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none
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=item exportable
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Icmp message types:
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ICMP_ECHOREPLY ICMP_UNREACH ICMP_SOURCEQUENCH
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ICMP_REDIRECT ICMP_ECHO ICMP_ROUTERADVERT
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ICMP_ROUTERSOLICIT ICMP_TIMXCEED ICMP_PARAMPROB
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ICMP_TSTAMP ICMP_TSTAMPREPLY ICMP_IREQ ICMP_IREQREPLY
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ICMP_MASREQ ICMP_MASKREPLY
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=item tags
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The following tags group together related exportable items.
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=over
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=item C<:strip>
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Import the strip function C<icmp_strip>.
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=item C<:ALL>
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All the above exportable items.
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=back
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=back
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=head1 EXAMPLE
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=head1 TODO
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=over
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=item Create constants
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=item Write example
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=back
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=head1 COPYRIGHT
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Copyright (c) 2001 Tim Potter.
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This package is free software and is provided "as is" without express
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or implied warranty. It may be used, redistributed and/or modified
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under the terms of the Perl Artistic License (see
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http://www.perl.com/perl/misc/Artistic.html)
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Copyright (c) 1995,1996,1997,1998,1999 ANU and CSIRO on behalf of
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the participants in the CRC for Advanced Computational Systems
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('ACSys').
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ACSys makes this software and all associated data and documentation
321
('Software') available free of charge. You may make copies of the
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Software but you must include all of this notice on any copy.
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The Software was developed for research purposes and ACSys does not
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warrant that it is error free or fit for any purpose. ACSys
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disclaims any liability for all claims, expenses, losses, damages
327
and costs any user may incur as a result of using, copying or
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modifying the Software.
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=head1 AUTHOR
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Tim Potter E<lt>tpot@samba.orgE<gt>
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Stephanie Wehner E<lt>atrak@itsx.comE<gt>
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=cut
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# any real autoloaded methods go after this line
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