https://implement-dns.wizardzines.com/

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Implement DNS in a weekend

  * Ways to use this guide
  * Part 1: Build a DNS query
  * Part 2: Parse the response
  * Part 3: Implement our resolver
  * Exercises

Implement DNS in a weekendP

Hello! Our goal here is to implement a toy DNS resolver.

What's a DNS resolver? It's a program that knows how to figure out
what the IP address for a domain is. Here's what the command line
interface of the resolver we're going to write looks like:

$ python3 resolve.py example.com
93.184.216.34

The whole thing is about 200 lines of Python, including implementing
all of the binary DNS parsing from scratch.

This project is a fun way to learn:

  * How to parse a binary network protocol like DNS

  * How DNS works under the hood (what's happening behind the scenes
    when you make a DNS query?)

There are also some bonus exercises if you want to implement a few
more of the features a real DNS resolver would have.

Everything is in a Jupyter notebook, which you can download and run.
You can download all the code here:

Download the code
  Ways to use this guide
By Julia Evans. A Wizard Zines project.