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Learning Python Networking

By : Dr. M. O. Faruque Sarker, Samuel B Washington, Sam Washington

3.7 (7)

Learning Python Networking

3.7 (7)

By: Dr. M. O. Faruque Sarker, Samuel B Washington, Sam Washington

Overview of this book

If you're a Python developer or a system administrator with Python experience and you're looking to take your first steps in network programming, then this book is for you. Basic knowledge of Python is assumed.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Network Programming and Python

1. Network Programming and Python

An introduction to TCP/IP networks

Network programming with Python

Breaking a few eggs

Summary

2. HTTP and Working with the Web

2. HTTP and Working with the Web

Request and response

Requests with urllib

Response objects

Status codes

Handling problems

HTTP headers

Customizing requests

Content negotiation

User agents

Cookies

Redirects

URLs

HTTP methods

Formal inspection

HTTPS

The Requests library

Summary

3. APIs in Action

3. APIs in Action

Getting started with XML

The Amazon S3 API

JSON

The Twitter API

HTML and screen scraping

With great power...

Summary

4. Engaging with E-mails

4. Engaging with E-mails

E-mail terminologies

Sending e-mails with SMTP

Sending e-mails securely with TLS

Retrieving e-mails by using POP3 with poplib

Retrieving e-mails by using IMAP with imaplib

Sending e-mail attachments

Sending e-mails via the logging module

Summary

5. Interacting with Remote Systems

5. Interacting with Remote Systems

Secure shell – access using Python

Transferring files through SFTP

Transferring files with FTP

Fetching Simple Network Management Protocol data

Reading Light-weight Directory Access Protocol data

Sharing files with SAMBA

Summary

6. IP and DNS

6. IP and DNS

Retrieving the network configuration of a local machine

Manipulating IP addresses

GeoIP look-ups

NTP clients

Summary

7. Programming with Sockets

7. Programming with Sockets

Basics of sockets

Working with TCP sockets

Working with UDP sockets

TCP port forwarding

A non-blocking socket I/O

Securing sockets with TLS/SSL

Creating a custom SSL client/server

Summary

8. Client and Server Applications

8. Client and Server Applications

Client and server

An echo protocol

A simple echo server

A simple echo client

Concurrent I/O

Multithreading and multiprocessing

A multithreaded echo server

Designing a chat server

A chat protocol

Handling data on persistent connections

A multithreaded chat server

A multithreaded chat client

Event-driven servers

A low-level event-driven chat server

Frameworks

An eventlet-based chat server

An asyncio-based chat server

More on frameworks

Taking our servers forward

Summary

9. Applications for the Web

9. Applications for the Web

What's in a web server?

Python and the Web

Flask – a microframework

Hosting Python web applications

Hosting in practice

Summary

A. Working with Wireshark

A. Working with Wireshark

Packet sniffers

Wireshark

Index

Index

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Transferring files through SFTP

SSH can be used effectively for securely transferring files between two computer nodes. The protocol used in this case is the secure file transfer protocol (SFTP). The Python paramiko module will supply the classes required for creating the SFTP session. This session can then perform a regular SSH login.

ssh_transport = paramiko.Transport(hostname, port)
ssh_transport.connect(username='username', password='password')

The SFTP session can be created from the SSH transport. The paramiko's working in the SFTP session will support the normal FTP commands such as get().

 sftp_session = paramiko.SFTPClient.from_transport(ssh_transport)
 sftp_session.get(source_file, target_file)

As you can see, the SFTP get command requires the source file's path and the target file's path. In the following example, the script will download a test.txt file, which is located on the user's home directory, through SFTP:

#!/usr/bin/env python3

import...

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