go-i2p Implementation Roadmap - go-i2p/go-i2p

go-i2p Implementation Roadmap

Completed Components ✅

Transport Layer (NTCP2)

  • ✅ Core NTCP2 Implementation: Complete functional NTCP2 transport
    • ✅ Session handshake using noise protocol
    • ✅ Inbound and outbound connection management
    • ✅ I2NP message framing and unframing
    • ✅ Session lifecycle management with proper cleanup
    • ✅ Message queuing with background workers
    • ✅ RouterInfo compatibility checking
    • ✅ Error handling and session recovery

I2NP Message System

  • ✅ Core Message Infrastructure: Complete I2NP message framework
    • ✅ Message parsing and serialization (NTCP format)
    • ✅ Interface-based message system with factory patterns
    • ✅ Data, DeliveryStatus, TunnelData message implementations
    • ✅ Database Store/Lookup message structures
    • ✅ Tunnel Build/Reply message structures
    • ✅ Build Request/Response Record parsing and interfaces

Tunnel Message Processing

  • ✅ Message Structure Handling: Tunnel message framework
    • ✅ Delivery Instructions parsing and validation
    • ✅ Fragment handling and reassembly logic
    • ✅ Tunnel message structure parsing
    • ✅ Build record interface implementations

Common Data Structures

  • ✅ Complete Data Structure Support: All I2P data types implemented
    • ✅ Keys and Certificates, Router Info/Address
    • ✅ Session Keys, Hashes, Signatures
    • ✅ Lease and LeaseSet structures

In Progress Components 🚧

NetDb Implementation

  • Database Store Integration:
    • 📋 Database Store message handling implementation
    • 📋 RouterInfo storage and retrieval
    • 📋 LeaseSet management and storage
    • 📋 Database lookup system
    • 📋 Peer selection logic (basic implementation)

Next Priority Components 🎯

Tunnel Building System

  • Active Tunnel Management:
    • 📋 Tunnel building coordination
    • 📋 Build request/response handling
    • 📋 Gateway and endpoint implementations
    • 📋 Participant tunnel processing

Tunnel Cryptography

  • Security Layer Implementation:
    • 📋 Layered encryption/decryption
    • 📋 Key generation and management
    • 📋 Tunnel message forwarding logic

Future Components 📅

SSU2 Transport (Post-NTCP2)

  • Secondary Transport Protocol:
    • 📋 SSU2 handshake implementation
    • 📋 UDP-based session management
    • 📋 Peer testing mechanisms
    • 📋 Introducer functionality

Advanced NetDb Features

  • Enhanced Database Operations:
    • 📋 Floodfill router functionality
    • 📋 Database exploration and publishing
    • 📋 LS2 and Encrypted LeaseSet support
    • 📋 Advanced peer selection algorithms

Application Layer

  • Client Applications:
    • 📋 I2CP implementation
    • 📋 Streaming library
    • 📋 Datagram support
    • 📋 End-to-end encryption (Garlic routing)

Current Status

Primary Goal: NTCP2 transport is feature-complete and actively sending/receiving I2NP messages. The foundation for tunnel building and NetDb integration is in place. Next major milestone is implementing database operations and tunnel building.

Test Coverage: Core components have basic test coverage including NTCP2 sessions, I2NP message processing, and tunnel message parsing.