Brute force a mac address using Scapy and DHCP to check the response

mac-bruteforce.py

import time
from itertools import product
import sys
from scapy.all import *

prefixes = ['001122','445566']
timeout = 10
breakcounter = 255
iface = 'eth0'

def capture(packet):
	# packet.show()
	print('Allowed: {0} = {1}'.format(str2mac(packet['BOOTP'].chaddr[:6]), packet['BOOTP'].yiaddr))

sniffer = AsyncSniffer(iface=iface, filter='udp dst port 68', prn=capture)
sniffer.start()

reset = breakcounter
try:
	for x in prefixes:
		prefix = ':'.join([x[i:i+2] for i in range(0, len(x), 2)])
		for y in product('0123456789abcdef', repeat=12-len(x)):
			suffix = ':'.join(['{0}{1}'.format(y[i], y[i+1]) for i in range(0, len(y), 2)])
			macaddress = '{0}:{1}'.format(prefix, suffix)			

			p = Ether(src=macaddress, dst="ff:ff:ff:ff:ff:ff")/\
				IP(src="0.0.0.0", dst="255.255.255.255") /\
				UDP(sport=68, dport=67) /\
				BOOTP(chaddr=mac2str(macaddress)) /\
				DHCP(options=[("message-type", "discover"),("hostname", 'scapy'), "end"])

			sys.stdout.write('Sending: {0}\r'.format(macaddress))
			sendp(p, iface=iface, verbose=0)
			if breakcounter:
				breakcounter -= 1
				if breakcounter < 1:
					breakcounter = reset
					break
	print()
	print('Sleeping: {0:d}s'.format(timeout))
	time.sleep(timeout)
	sniffer.stop()

except KeyboardInterrupt:
	sniffer.stop()

print('Shutdown...')