DNS Server in Rust (from Scratch)

A lightweight, async DNS server written in Rust, built from scratch using tokio. It parses raw DNS packets manually and supports:

✅ DNS query parsing
✅ UDP socket handling
✅ Hardcoded A record replies
✅ Forwarding to Remote DNS server 8.8.8.8 when record not found
✅ In-memory response caching

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📸 Architecture

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🔁 DNS Flow

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🛠️ Features

• Built with tokio and pure std for learning and performance
• Handles DNS over UDP (port 5354)
• Caches responses using an in-memory RwLock<HashMap<..>>
• Manually parses DNS headers and questions — no magic libraries
• Forwards queries to Google DNS (8.8.8.8) if not in cache

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🚀 Run It

cargo run