Book Image

Python Network Programming Cookbook

By : Dr. M. O. Faruque Sarker
Book Image

Python Network Programming Cookbook

By: Dr. M. O. Faruque Sarker

Overview of this book

<p>Python is an excellent language to use to write code and have fun by prototyping applications quickly. The presence of lots of third-party libraries, also known as batteries, makes it even more easier and faster to prototype an application or to implement a new algorithm. If you are interested in creating the building blocks for many practical web and networking applications that rely on networking protocols then this book is a must-have.<br /><br />This book highlights major aspects of network programming in Python starting from writing simple networking clients, to developing complex screen-scraping and network security monitoring scripts. It creates the building blocks for many practical web and networking applications that rely on various networking protocols. This book presents the power and beauty of Python in solving the numerous real-world tasks in the area of network programming, system and network administration, network monitoring, and web-application development. <br /><br />This book develops your ability to solve a wide range of network programming tasks in Python. We will start by exploring the Python standard library functions to create client/server network and manipulate your local networking resources available under both IPv4 and IPv6. The practical focus continues with creating web and email clients, scraping web pages, fetching information from various websites, and searching for information on the Web such as Amazon, Flickr, and other sites. It further develops your skills to analyze your network security vulnerabilities using advanced network packet capture and analysis techniques.</p>

Related Content you might be interested in

Current Title:

Small book image
Python Network Programming Cookbook
Dr. M. O. Faruque Sarker
Mar, 2014 | 234 pages
No titles found
Table of Contents (16 chapters)
Python Network Programming Cookbook
Python Network Programming Cookbook
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Sockets, IPv4, and Simple Client/Server Programming
Sockets, IPv4, and Simple Client/Server Programming
Introduction
Printing your machine's name and IPv4 address
Retrieving a remote machine's IP address
Converting an IPv4 address to different formats
Finding a service name, given the port and protocol
Converting integers to and from host to network byte order
Setting and getting the default socket timeout
Handling socket errors gracefully
Modifying socket's send/receive buffer sizes
Changing a socket to the blocking/non-blocking mode
Reusing socket addresses
Printing the current time from the Internet time server
Writing a SNTP client
Writing a simple echo client/server application
2
Multiplexing Socket I/O for Better Performance
Multiplexing Socket I/O for Better Performance
Introduction
Using ForkingMixIn in your socket server applications
Using ThreadingMixIn in your socket server applications
Writing a chat server using select.select
Multiplexing a web server using select.epoll
Multiplexing an echo server using Diesel concurrent library
3
IPv6, Unix Domain Sockets, and Network Interfaces
IPv6, Unix Domain Sockets, and Network Interfaces
Introduction
Forwarding a local port to a remote host
Pinging hosts on the network with ICMP
Waiting for a remote network service
Enumerating interfaces on your machine
Finding the IP address for a specific interface on your machine
Finding whether an interface is up on your machine
Detecting inactive machines on your network
Performing a basic IPC using connected sockets (socketpair)
Performing IPC using Unix domain sockets
Finding out if your Python supports IPv6 sockets
Extracting an IPv6 prefix from an IPv6 address
Writing an IPv6 echo client/server
4
Programming with HTTP for the Internet
Programming with HTTP for the Internet
Introduction
Downloading data from an HTTP server
Serving HTTP requests from your machine
Extracting cookie information after visiting a website
Submitting web forms
Sending web requests through a proxy server
Checking whether a web page exists with the HEAD request
Spoofing Mozilla Firefox in your client code
Saving bandwidth in web requests with the HTTP compression
Writing an HTTP fail-over client with resume and partial downloading
Writing a simple HTTPS server code with Python and OpenSSL
5
E-mail Protocols, FTP, and CGI Programming
E-mail Protocols, FTP, and CGI Programming
Introduction
Listing the files in a remote FTP server
Uploading a local file to a remote FTP server
E-mailing your current working directory as a compressed ZIP file
Downloading your Google e-mail with POP3
Checking your remote e-mail with IMAP
Sending an e-mail with an attachment via Gmail SMTP server
Writing a guestbook for your (Python-based) web server with CGI
6
Screen-scraping and Other Practical Applications
Screen-scraping and Other Practical Applications
Introduction
Searching for business addresses using the Google Maps API
Searching for geographic coordinates using the Google Maps URL
Searching for an article in Wikipedia
Searching for Google stock quote
Searching for a source code repository at GitHub
Reading news feed from BBC
Crawling links present in a web page
7
Programming Across Machine Boundaries
Programming Across Machine Boundaries
Introduction
Executing a remote shell command using telnet
Copying a file to a remote machine by SFTP
Printing a remote machine's CPU information
Installing a Python package remotely
Running a MySQL command remotely
Transferring files to a remote machine over SSH
Configuring Apache remotely to host a website
8
Working with Web Services – XML-RPC, SOAP, and REST
Working with Web Services – XML-RPC, SOAP, and REST
Introduction
Querying a local XML-RPC server
Writing a multithreaded multicall XML-RPC server
Running an XML-RPC server with a basic HTTP authentication
Collecting some photo information from Flickr using REST
Searching for SOAP methods from an Amazon S3 web service
Searching Google for custom information
Searching Amazon for books through product search API
9
Network Monitoring and Security
Network Monitoring and Security
Introduction
Sniffing packets on your network
Saving packets in the pcap format using the pcap dumper
Adding an extra header in HTTP packets
Scanning the ports of a remote host
Customizing the IP address of a packet
Replaying traffic by reading from a saved pcap file
Scanning the broadcast of packets
Index
Index

Printing a remote machine's CPU information

Sometimes, we need to run a simple command on a remote machine over SSH. For example, we need to query the remote machine's CPU or RAM information. This can be done from a Python script as shown in this recipe.

Getting ready

You need to install the third-party package, Paramiko, as shown in the following command, from the source available from GitHub's repository at https://github.com/paramiko/paramiko:

$ pip install paramiko

How to do it...

We can use the paramiko module to create a remote session to a Unix machine.

Then, from this session, we can read the remote machine's /proc/cpuinfo file to extract the CPU information.

Listing 7.3 gives the code for printing a remote machine's CPU information, as follows:

#!/usr/bin/env python
# Python Network Programming Cookbook -- Chapter - 7
# This program is optimized for Python 2.7.
# It may run on any other version with/without modifications.
 
import argparse
import getpass
import paramiko
 
RECV_BYTES ...
Previous Section
End of Section 5
Next Section