Download Foundations of Python Network Programming: Third Edition by Brandon Rhodes, John Goerzen (auth.) PDF

By Brandon Rhodes, John Goerzen (auth.)

Foundations of Python community Programming, Third Edition, covers all the vintage themes present in the second one version of this ebook, together with community protocols, community information and error, e mail, server structure, and HTTP and net functions, plus updates for Python 3.

Some of the hot issues during this variation include:

• vast insurance of the up to date SSL help in Python 3

• how one can write your individual asynchronous I/O loop.

• an summary of the "asyncio" framework that incorporates Python 3.4.

• How the Flask internet framework connects URLs on your Python code.

• How cross-site scripting and cross-site request forgery can be utilized to assault your website, and the way to guard opposed to them.

• How a full-stack net framework like Django can automate the around journey out of your database to the reveal and back.

If you are a Python programmer who wishes a deep realizing of ways to exploit Python for network-related initiatives and functions, this can be the e-book for you. From internet program builders, to platforms integrators, to process administrators—this booklet has every little thing it's essential to know.

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Additional resources for Foundations of Python Network Programming: Third Edition

Example text

Sometimes we write these deliberately, as when we are doing network monitoring and want to see all of the packets arriving at an interface. In this case, however, promiscuity is a problem. Only good, well-written encryption should really convince your code that it has talked to the right server. Short of that, there are two quick checks you can do. First, design or use protocols that include a unique identifier or request ID in the request that gets repeated in the reply. If the reply contains the ID you are looking for, then—so long as the range of IDs is large enough that someone could not simply be quickly flooding you with thousands or millions of packets containing every possible ID—someone who saw your request must at least have composed it.

This lets a receiver forbid the transmission of additional packets in cases where its input buffer is full, and it would have to discard more data anyway even if it were to arrive. • Finally, if TCP believes that packets are being dropped, it assumes that the network is becoming congested and reduces how much data it sends every second. This can be something of a disaster on wireless networks and other media where packets are lost simply because of noise. It can also ruin connections that are running fine until a router reboots and the endpoints cannot talk for, say, 20 seconds.

Sadly, life is not so simple. It actually depends on your choice of operating system and how it is configured whether inbound packets addressed to one interface are allowed to arrive at another interface. It might be that your system will quite happily accept packets that claim to be from other servers on your network if they appear over your public Internet connection! Check with your operating system documentation, or your system administrator, to find out more about your particular case. Configuring and running a firewall on your box could also provide protection if your operating system does not.

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