sing-box Internals

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sing-box InternalsComplete Technical Analysis

Deep dive into sing-box architecture, protocols, and implementation details for reimplementation

Architecture
Protocols
Implementation Checklist

Context-Based Architecture

Service registry pattern using Go contexts for dependency injection, with 4-phase lifecycle management and extensible adapter interfaces

20+ Proxy Protocols

VLESS, VMess, Trojan, Shadowsocks, ShadowTLS, Hysteria2, TUIC, AnyTLS, WireGuard, NaiveProxy, and more — all through sing-* libraries

Modular Transport

V2Ray-compatible transports (WebSocket, gRPC, HTTP, HTTPUpgrade, QUIC) plus TLS/uTLS/REALITY/kTLS security

Advanced Routing

Action-based rule system with sniff/resolve/route/reject/bypass/hijack-dns actions, rule sets, and process matching

Comprehensive DNS

Multi-transport DNS with rule routing, FakeIP, caching, EDNS0 client subnet, and platform-native resolvers

Cross-Platform

TUN support via sing-tun, mobile platform bindings (libbox), Clash API compatibility, and system proxy integration