##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Auxiliary

	include Msf::Exploit::Capture
	include Msf::Auxiliary::Scanner

	def initialize
		super(
			'Name'        => 'Rogue Gateway Detection: Sender',
			'Description' => %q{
				This module send a series of TCP SYN and ICMP ECHO requests
			to each internal target host, spoofing the source address of an external
			system running the rogue_recv module. This allows the system running
			the rogue_recv module to determine what external IP a given internal
			system is using as its default route.
			},
			'Author'      => 'hdm',
			'License'     => MSF_LICENSE,
			'References'  =>
				[
					['URL', 'http://www.metasploit.com/research/projects/rogue_network/'],
				]
		)

		register_options([
			OptAddress.new("EHOST", [true, "The IP address of the machine running rogue_recv"]),
			OptPort.new("RPORT", [true, "The destination port for the TCP SYN packet", 80]),
			OptPort.new("CPORT", [true, "The source port for the TCP SYN packet", 13832]),
			OptInt.new("ECHOID", [true, "The unique ICMP ECHO ID to embed into the packet", 7893]),
		])

		deregister_options('FILTER','PCAPFILE')
	end

	def run_host(ip)
		open_pcap

		pcap = self.capture

		capture_sendto(build_tcp_syn(ip), ip)

		capture_sendto(build_icmp(ip), ip)

		close_pcap
	end

	def build_tcp_syn(dst)
		p = PacketFu::TCPPacket.new
		p.ip_saddr = datastore['EHOST']
		p.ip_daddr = dst
		p.ip_ttl = 255
		p.tcp_sport = datastore['CPORT'].to_i
		p.tcp_dport = datastore['RPORT'].to_i
		p.tcp_flags.syn = 1
		p.tcp_seq = Rex::Socket.addr_atoi(dst)
		p.recalc
		p
	end

	def build_icmp(dst)
		p = PacketFu::ICMPPacket.new
		p.ip_saddr = datastore['EHOST']
		p.ip_daddr = dst
		p.ip_ttl = 255
		p.icmp_type = 8
		payload = Rex::Socket.addr_aton(dst) + [datastore['ECHOID']].pack('n') + Rex::Text.rand_text(26)
		p.payload = capture_icmp_echo_pack(datastore['ECHOID'],1,payload)
		p.recalc
	end
end
