Book Image

Mastering Python for Networking and Security - Second Edition

By : José Ortega
Book Image

Mastering Python for Networking and Security - Second Edition

By: José Ortega

Overview of this book

It’s now more apparent than ever that security is a critical aspect of IT infrastructure, and that devastating data breaches can occur from simple network line hacks. As shown in this book, combining the latest version of Python with an increased focus on network security can help you to level up your defenses against cyber attacks and cyber threats. Python is being used for increasingly advanced tasks, with the latest update introducing new libraries and packages featured in the Python 3.7.4 recommended version. Moreover, most scripts are compatible with the latest versions of Python and can also be executed in a virtual environment. This book will guide you through using these updated packages to build a secure network with the help of Python scripting. You’ll cover a range of topics, from building a network to the procedures you need to follow to secure it. Starting by exploring different packages and libraries, you’ll learn about various ways to build a network and connect with the Tor network through Python scripting. You will also learn how to assess a network's vulnerabilities using Python security scripting. Later, you’ll learn how to achieve endpoint protection by leveraging Python packages, along with writing forensic scripts. By the end of this Python book, you’ll be able to use Python to build secure apps using cryptography and steganography techniques.
Table of Contents (22 chapters)
1
Section 1: The Python Environment and System Programming Tools
4
Section 2: Network Scripting and Extracting Information from the Tor Network with Python
8
Section 3: Server Scripting and Port Scanning with Python
12
Section 4: Server Vulnerabilities and Security in Python Modules
16
Section 5: Python Forensics

Implementing a simple UDP client and UDP server

In this section, we will review how you can set up your own UDP client-server application with Python's socket module. The application will be a server that listens for all connections and messages over a specific port and prints out any messages to the console that have been exchanged between the client and server.

UDP is a protocol that is on the same level as TCP, that is, above the IP layer. It offers a service in disconnected mode to the applications that use it. This protocol is suitable for applications that require efficient communication that doesn't have to worry about packet loss. Typical applications of UDP are internet telephony and video streaming.

The header of a UDP frame is composed of four fields:

  • The UDP port of origin.
  • The UDP destination port.
  • The length of the UDP message.
  • checkSum contains information related to the error control field.

The only difference between working...