DNS Server

A minimalist Authoritative DNS Server implemented in C++ from scratch.

Features

• Authoritative Only: Provides direct answers for configured zones.
• UDP Protocol: Handles DNS queries over UDP (Default port: 5300).
• Binary Parsing: Manual parsing and construction of DNS packets (RFC 1035).
• A Record Support: Specifically handles IPv4 address lookups.
• In-Memory Store: Fast record lookup using a hash-map based zone store.

Technical Highlights

• No external libraries used for DNS protocol handling.
• Manual bit-manipulation for DNS header flags and fields.
• Endianness-aware byte serialization/deserialization.
• Modular architecture: Protocol, Zone, and Utility layers.

Implementation Details

• Language: C++ 20
• Build System: CMake
• Supported Query: Type A (IPv4)
• Response Codes: NOERROR, NXDOMAIN