The tiny-resolver from jvns

tiny-resolver's Introduction

tiny DNS resolver

This is a command line program that makes DNS queries. There's a version in bash and a version in Go.

how to run it

The bash version:

bash resolve.sh example.com.

The go version:

go run resolve.go example.com.

The Python version

pip install dnspython
python3 resolve.py example.com

other versions

blog post

You can read more about how this works in A toy DNS resolver

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tiny-resolver's Issues

Since this is github, no project would be complete without at least one issue filed against it!

go run resolve.go www.shitpile.com
Hilarity ensues.

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x48 pc=0x100fa26e0]

goroutine 1 [running]:
main.getAnswer(0x0)
	/Users/jkh/Src/gocode/tiny-resolver/resolve.go:35 +0x20
main.resolve({0x140001520a8, 0x11})
	/Users/jkh/Src/gocode/tiny-resolver/resolve.go:17 +0x84
main.main()
	/Users/jkh/Src/gocode/tiny-resolver/resolve.go:78 +0xc4
exit status 2

Please do not ask how I happened to think up or choose that test domain name. I do not know, it just came to me at random. Perhaps I was thinking of an old car I used to own. It is nonetheless a unique finding.

A version in Python

Basically the same as your Go version + CNAME support (it addresses #2). https://www.bortzmeyer.org/files/tiny-resolver.py You are welcome to include it in your Github repository / article if you wish.

A version in Rust

https://github.com/kmkaplan/tiny-resolver-rs

A version in Elixir

Basically the same as your Go version. https://www.bortzmeyer.org/files/tiny-resolver.tar . You are welcome to include it in your Github repository / article if you wish.

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