Book Image

Python Network Programming

By : Abhishek Ratan, Eric Chou, Pradeeban Kathiravelu, Dr. M. O. Faruque Sarker
Book Image

Python Network Programming

By: Abhishek Ratan, Eric Chou, Pradeeban Kathiravelu, Dr. M. O. Faruque Sarker

Overview of this book

This Learning Path highlights major aspects of Python network programming such as writing simple networking clients, creating and deploying SDN and NFV systems, and extending your network with Mininet. You’ll also learn how to automate legacy and the latest network devices. As you progress through the chapters, you’ll use Python for DevOps and open source tools to test, secure, and analyze your network. Toward the end, you'll develop client-side applications, such as web API clients, email clients, SSH, and FTP, using socket programming. By the end of this Learning Path, you will have learned how to analyze a network's security vulnerabilities using advanced network packet capture and analysis techniques. This Learning Path includes content from the following Packt products: • Practical Network Automation by Abhishek Ratan • Mastering Python Networking by Eric Chou • Python Network Programming Cookbook, Second Edition by Pradeeban Kathiravelu, Dr. M. O. Faruque Sarker
Table of Contents (30 chapters)
Title Page
Copyright
About Packt
Contributors
Preface
Index

Finding DNS host information


It may be useful for us to know the domain name of a given IP address. First given an address, we need to know whether it even resolves to a valid address identifiable in the internet. We may use the dnspython library for these tasks.

Getting ready

First install dnspython (https://github.com/rthalley/dnspython) using the pip:

$ sudo pip install dnspython

How to do it...

We import dns.reversename of dnspython to do a simple exercise of finding the reverse name of an address from the given address. We use dns.resolver to find the address that an IP address resolves to be.

Listing 11.2 gives the domain information for a given IP address 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.reversename 
import dns.resolver 
 
def main(address): 
    n = dns...