Python Network Programming

How to do it...

We import dns.name of dnspython to do a simple exercise to find the DNS names from the user inputs of two web URLs, and how these web URLs are related.

Listing 11.1 evaluates the user input of two web URLs for the DNS names as follows:

#!/usr/bin/env python 
# Python Network Programming Cookbook, Second Edition   -- Chapter - 11 
# This program is optimized for Python 2.7.12 and  Python 3.5.2. 
# It may run on any other version with/without  modifications. 
 
 
import argparse 
import dns.name 
 
def main(site1, site2): 
    _site1 = dns.name.from_text(site1) 
    _site2 = dns.name.from_text(site2) 
    print("site1 is subdomain of site2: ",    _site1.is_subdomain(_site2))  
    print("site1 is superdomain of site2: ", _site1.is_superdomain(_site2)) print("site1 ...