RustDNS: Writing a Recursive DNS Resolver in Rust, Byte by Byte

Описание и применение

RustDNS – минимальный рекурсивный резолвер DNS, написанный на Rust без внешних зависимостей. Он слушает UDP‑порт 2053, последовательно запрашивает корневые, TLD‑ и авторитетные серверы и возвращает ответы клиенту.

Задача

Build a minimal recursive DNS resolver in Rust that can resolve domain names without external dependencies.

Результат

The resolver successfully resolves google.com by querying root, TLD, and authoritative servers, returning multiple A records.

Рабочий процесс

• Clone the repository from GitHub
• Run cargo run --release to start the resolver on 0.0.0.0:2053
• Use dig @127.0.0.1 -p 2053 google.com to query the resolver
• Observe the resolver printing each lookup step and the final answers
• Optionally use the provided 12‑line Python client to send a query

Доказательства

RustDNS is a recursive DNS resolver written in plain Rust with zero dependencies, just std::net::UdpSocket and a 512-byte array.

Источник

Port 2053 instead of 53 is deliberate: ports below 1024 need root on Linux, and this way you don't have to sudo a learning project.

Источник

Received query: DnsQuestion { name: "google.com", qtype: A } attempting lookup of A google.com with ns 198.41.0.4 attempting lookup of A google.com with ns 192.41.162.30 attempting lookup of A google.com with ns 216.239.34.10 Answer: A { domain: "google.com", addr: 142.250.29.100, ttl: 300 }

Источник