1#!/usr/bin/perl
2#
3# $Id: icmp-redirect.pl 1640 2009-11-09 17:58:27Z gomor $
4#
5use strict;
6use warnings;
7
8use Getopt::Std;
9my %opts;
10getopts('i:d:I:g:v', \%opts);
11
12die "Usage: $0 -i dstIp -g gateway [-d device] [-I srcIp] [-v]\n"
13   unless $opts{i} && $opts{g};
14
15use Net::Packet;
16
17$Env->dev($opts{d}) if $opts{d};
18$Env->ip ($opts{I}) if $opts{I};
19$Env->debug(3)      if $opts{v};
20$Env->noFrameAutoDump(1);
21
22my $ip = Net::Packet::IPv4->new(
23   protocol => NP_IPv4_PROTOCOL_ICMPv4,
24   dst      => $opts{i},
25);
26
27my $iperror = Net::Packet::IPv4->new(dst => "192.168.0.1");
28
29my $tcperror = Net::Packet::TCP->new(dst => 6666);
30
31my $error = Net::Packet::Frame->new(l3 => $iperror, l4 => $tcperror);
32
33my $icmp = Net::Packet::ICMPv4->new(
34   type    => NP_ICMPv4_TYPE_REDIRECT,
35   code    => NP_ICMPv4_CODE_FOR_HOST,
36   gateway => $opts{g},
37   error   => $error,
38);
39
40my $frame = Net::Packet::Frame->new(
41   l3 => $ip,
42   l4 => $icmp,
43);
44
45$frame->send;
46