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Python Network Programming Cookbook

Python Network Programming Cookbook

By : Pradeeban Kathiravelu, Gary Berger, Dr. M. O. Faruque Sarker
3.5 (4)
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Python Network Programming Cookbook

Python Network Programming Cookbook

3.5 (4)
By: Pradeeban Kathiravelu, Gary Berger, Dr. M. O. Faruque Sarker

Overview of this book

Python Network Programming Cookbook - Second Edition highlights the major aspects of network programming in Python, starting from writing simple networking clients to developing and deploying complex Software-Defined Networking (SDN) and Network Functions Virtualization (NFV) systems. It creates the building blocks for many practical web and networking applications that rely on various networking protocols. It presents the power and beauty of Python to solve numerous real-world tasks in the area of network programming, network and system administration, network monitoring, and web-application development. In this edition, you will also be introduced to network modelling to build your own cloud network. You will learn about the concepts and fundamentals of SDN and then extend your network with Mininet. Next, you’ll find recipes on Authentication, Authorization, and Accounting (AAA) and open and proprietary SDN approaches and frameworks. You will also learn to configure the Linux Foundation networking ecosystem and deploy and automate your networks with Python in the cloud and the Internet scale. By the end of this book, you will be able to analyze your network security vulnerabilities using advanced network packet capture and analysis techniques.
Table of Contents (15 chapters)
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Finding a service name, given the port and protocol

If you would like to discover network services, it may be helpful to determine what network services run on which ports using either the TCP or UDP protocol.

Getting ready

If you know the port number of a network service, you can find the service name using the getservbyport() socket class function from the socket library. You can optionally give the protocol name when calling this function.

How to do it...

Let us define a find_service_name() function, where the getservbyport() socket class function will be called with a few ports, for example, 80, 25. We can use Python's for-in loop construct.

Listing 1.4 shows finding_service_name as follows:

#!/usr/bin/env python 
# Python Network Programming Cookbook, Second Edition -- Chapter - 1 
# 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 socket 
 
def find_service_name(): 
    protocolname = 'tcp' 
    for port in [80, 25]: 
        print ("Port: %s => service name: %s" %(port, socket.getservbyport(port, protocolname))) 
     
    print ("Port: %s => service name: %s" %(53, socket.getservbyport(53, 'udp'))) 
     
if __name__ == '__main__': 
    find_service_name() 
 

If you run this script, you will see the following output:

$ python 1_4_finding_service_name.py 
    
Port: 80 => service name: http
Port: 25 => service name: smtp
Port: 53 => service name: domain
    

This indicates that http, smtp, and domain services are running on the ports 80, 25, and 53 respectively.

How it works...

In this recipe, the for-in statement is used to iterate over a sequence of variables. So for each iteration, we use one IP address to convert them in their packed and unpacked format.

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