Overview

In both Rust and Go, I built a (mostly) RFC 1035 compliant DNS server, that is cabable of both resolving and forwarding DNS messages.

This was a learning opportunity for me, and should definitely not be used in production.

Usage

For the Go application: make sure you have Go version 1.24 or later installed, and be sure that you have navigated inside the go directory.

For the Rust application: make sure you have Rust version 1.86.0 or later installed, and be sure that you have navigated inside the rust directory.

To run the code, you have two options:

• You can run this as a DNS resolver, which will mean any DNS requests sent to the server will resolve to IP address 192.168.0.6

  • For Go, run go run .
  • For Rust, run cargo run

• You can run this as a DNS forwarder, which means the server will forward DNS requests to a server you specify, and give you the response

  • For Go, run go run . --resolver <DNS SERVER IP>:<DNS SERVER PORT>
  • For Rust, run cargo run -- --resolver <DNS SERVER IP>:<DNS SERVER PORT>

To test that the server is working, we'll use the dig command: dig @127.0.0.1 -p 2053 +noedns google.com

Depending on whether you run the server as a resolver/forwarder, you'll get different IP addresses.