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Software Craftsmanship - DNS Server

Introduction

Build a DNS server that can resolve domain names to IP addresses, with caching and recursive resolution. This challenge explores network protocols, caching strategies, and domain name system architecture.

Objectives

  • Understand DNS protocol and message formats
  • Implement recursive DNS resolution
  • Add caching for performance optimization
  • Learn about network protocol implementation

Instructions

  1. Environment Setup:

    • Choose your preferred programming language
    • Set up a project structure following common conventions for your chosen language (e.g., src/ for source files, tests/ for test files, include networking libraries)

  2. Implementation Details:

    • Parse DNS query messages and extract domain names
    • Implement recursive resolution by querying root servers
    • Follow DNS hierarchy through TLD and authoritative servers
    • Cache responses to improve performance
    • Handle different record types (A, AAAA, CNAME, etc.)

  3. Testing:

    • Test domain resolution against known DNS servers
    • Verify caching behavior and cache expiration
    • Check handling of different record types
    • Test with various domain names and edge cases

Possible Improvements

  • Add DNSSEC validation support
  • Implement authoritative server functionality
  • Add zone file parsing for local domains
  • Create a DNS proxy with filtering capabilities

Conclusion

By completing this challenge, you will understand how the Domain Name System works and gain experience in implementing network protocols.

Happy coding!