FTP Bounce Port Scanner

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
  
# Order is important here  
include Msf::Auxiliary::Report  
include Msf::Auxiliary::Scanner  
include Msf::Exploit::Remote::Ftp  
  
def initialize  
super(  
'Name' => 'FTP Bounce Port Scanner',  
'Description' => %q{  
Enumerate TCP services via the FTP bounce PORT/LIST  
method.  
},  
'Author' => 'kris katterjohn',  
'License' => MSF_LICENSE  
)  
  
register_options([  
OptString.new('PORTS', [true, "Ports to scan (e.g. 22-25,80,110-900)", "1-10000"]),  
OptAddress.new('BOUNCEHOST', [true, "FTP relay host"]),  
OptPort.new('BOUNCEPORT', [true, "FTP relay port", 21]),  
OptInt.new('DELAY', [true, "The delay between connections, per thread, in milliseconds", 0]),  
OptInt.new('JITTER', [true, "The delay jitter factor (maximum value by which to +/- DELAY) in milliseconds.", 0])  
])  
  
deregister_options('RPORT')  
end  
  
# No IPv6 support yet  
def support_ipv6?  
false  
end  
  
def rhost  
datastore['BOUNCEHOST']  
end  
  
def rport  
datastore['BOUNCEPORT']  
end  
  
def run_host(ip)  
ports = Rex::Socket.portspec_crack(datastore['PORTS'])  
if ports.empty?  
raise Msf::OptionValidateError.new(['PORTS'])  
end  
  
jitter_value = datastore['JITTER'].to_i  
if jitter_value < 0  
raise Msf::OptionValidateError.new(['JITTER'])  
end  
  
delay_value = datastore['DELAY'].to_i  
if delay_value < 0  
raise Msf::OptionValidateError.new(['DELAY'])  
end  
  
return if not connect_login  
  
ports.each do |port|  
# Clear out the receive buffer since we're heavily dependent  
# on the response codes. We need to do this between every  
# port scan attempt unfortunately.  
while true  
r = sock.get_once(-1, 0.25)  
break if not r or r.empty?  
end  
  
begin  
  
# Add the delay based on JITTER and DELAY if needs be  
add_delay_jitter(delay_value,jitter_value)  
  
host = (ip.split('.') + [port / 256, port % 256]).join(',')  
resp = send_cmd(["PORT", host])  
  
if resp =~ /^5/  
#print_error("Got error from PORT to #{ip}:#{port}")  
next  
elsif not resp  
next  
end  
  
resp = send_cmd(["LIST"])  
  
if resp =~ /^[12]/  
print_good(" TCP OPEN #{ip}:#{port}")  
report_service(:host => ip, :port => port)  
end  
rescue ::Exception  
print_error("Unknown error: #{$!}")  
end  
end  
end  
end  
`