A toy DNS resolver
Hello! I wrote a comic last week called “life of a DNS query” that explains how DNS resolvers work. In this post, I want to explain how DNS resolvers work in a different way – with a short Go program that does the same thing described in the comic. The main function (resolve) is actually just 20 lines, including comments. I usually find it easier to understand things work when they come in the for
Why strace doesn't work in Docker
While editing the capabilities page of the how containers work zine, I found myself trying to explain why strace doesn’t work in a Docker container. The problem here is – if I run strace in a Docker container on my laptop, this happens: $ docker run -it ubuntu:18.04 /bin/bash $ # ... install strace ... root@e27f594da870:/# strace ls strace: ptrace(PTRACE_TRACEME, ...): Operation not permitted stra
What happens if you write a TCP stack in Python?
August 12, 2014 During Hacker School, I wanted to understand networking better, and I decided to write a miniature TCP stack as part of that. I was much more comfortable with Python than C and I’d recently discovered the scapy networking library which made sending packets really easy. So I started writing teeceepee! The basic idea was open a raw network socket that lets me send TCP packets send a
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