Download Foundations of Python Network Programming (3rd Edition) by John Goerzen, Brandon Rhodes PDF

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By John Goerzen, Brandon Rhodes

Foundations of Python community Programming, 3rd variation, covers all the vintage subject matters present in the second one variation of this booklet, together with community protocols, community information and error, electronic mail, server structure, and HTTP and net functions, plus updates for Python 3.

Some of the hot subject matters during this version include:

• broad assurance of the up-to-date SSL help in Python 3
• the best way to write your individual asynchronous I/O loop.
• an summary of the "asyncio" framework that includes Python 3.4.
• How the Flask internet framework connects URLs in your Python code.
• How cross-site scripting and cross-site request forgery can be utilized to assault your site, 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're a Python programmer who wishes a deep knowing of ways to exploit Python for network-related projects and functions, this can be the publication for you. From net program builders, to platforms integrators, to approach administrators—this publication has every little thing that you have to be aware of.

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Extra resources for Foundations of Python Network Programming (3rd Edition)

Example text

28 CHAPTER 2 N UDP First, doing a connect() on a UDP socket does not send any information across the network or do anything to warn the server that packets might be coming. It simply writes the address into the operating system’s memory for use when you later call send() and recv(). Second, please remember that doing a connect()—or even filtering out unwanted packets yourself using the return address—is not a form of security! If there is someone on the network who is really malicious, it is usually easy enough for their computer to forge packets with the server’s return address so that their faked replies will make it past your address filter just fine.

I glanced over the list and made the gamble that you, gentle reader, are not running SAP BusinessObjects Polestar on the laptop or desktop or server where you are running my Python scripts. If you are, then try giving the server a –p option to select a different port number. Note that the Python program can always use a socket’s getsockname() method to retrieve a tuple that contains the current IP address and port to which the socket is bound. Once the socket has been bound successfully, the server is ready to start receiving requests!

This is because of the second, less-obvious effect of using connect() to configure a UDP socket’s preferred destination: once you have run connect(), the operating system will discard any incoming packets to your port whose return address does not match the address to which you have connected. There are, then, two ways to write UDP clients that are careful about the return addresses of the packets arriving back. u You can use sendto() and direct each outgoing packet to a specific destination, then use recvfrom() to receive the replies and carefully check each return address against the list of servers to which you have made outstanding requests.

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