DNS Resolver (RFC 1035)

for more details refer to /notesv0.md and notesv1.md

A fully functional, recursive DNS resolver implemented in Rust from scratch. This project was built to understand the inner workings of the Domain Name System, including packet parsing, pointer compression, and the iterative resolution process.

🚀 Features

• Recursive Resolution: Automatically traverses the DNS hierarchy (Root -> TLD -> Authoritative) to find answers.
• IPv4 & IPv6 Support: Handles both A (IPv4) and AAAA (IPv6) records.
• DNS Caching: Implements a time-to-live (TTL) aware cache with automatic expiration.
• Telemetry & Tracing: Provides a detailed visual trace of every step in the resolution process, including cache hits/misses and nameserver referrals.
• Robust Parsing: Safe handling of malformed packets and protection against malicious pointer loops (infinite recursion).
• Security Simulations: Includes built-in tools to simulate and test Cache Poisoning and Packet Spoofing attacks.

🛠️ Usage

1. Clone and Run:

   git clone https://github.com/akshayrivers/DNS-Resolver.git
   cd DNS-Resolver
   cargo run

2. Commands:

   • resolve <domain> [type] - Resolves a domain (e.g., resolve google.com AAAA).
   • poison <domain> <ip> - Injects a malicious entry into the local cache.
   • spoof <domain> <ip> - Simulates a packet interception attack.
   • help - Shows all available commands.

🛡️ Security Features

The resolver is designed with basic security and robustness in mind:

• Loop Protection: Detects and breaks out of malicious DNS pointer loops.
• Bounds Checking: Rigorous checks during packet parsing to prevent panics on malformed data.
• Attack Testing: Integrated environment for studying DNS vulnerabilities.

📖 Technical Implementation

• No Libraries: Built using only the Rust Standard Library (std).
• Custom Parser: Implements RFC 1035 byte-level parsing for Headers, Questions, and Resource Records.
• UDP Socketry: Manual management of UDP communication with global nameservers.

📝 Author

Vinod Akshat
Note: Gimme a Job 😔