Python Penetration Testing Cookbook

How to do it...

Here are the steps for creating a simple network scanner using the scapy module:

1. Create a file called network-scanner.py and open it in your editor.
2. Import the required modules for the script:

import socket, re 
from scapy.all import * 

3. To get the local IP of the system, we use the getsockname method in the socket module. However, it require a connection. So, we create a UDP socket connection to connect to Google DNS and use this connection to enumerate the local IP:

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 
s.connect(('8.8.8.8', 80)) 
ip = s.getsockname()[0] 

4. Now we extract the local IP and truncate the last IP digits with a regular expression:

end = re.search('^[\d]{1,3}.[\d]{1,3}.[\d]{1,3}.[\d]{1,3}', ip) ...