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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Build Commands
+
+```bash
+# Build server and client binaries
+go build -o server ./cmd/server
+go build -o client ./cmd/client
+
+# Run server (zero-config, auto-generates token and TLS cert)
+./server
+./server -c server.yaml  # with config file
+
+# Run client
+./client -s <server>:7000 -t <token> -id <client-id>
+./client -s <server>:7000 -t <token> -id <client-id> -no-tls  # disable TLS
+
+# Web UI development (in web/ directory)
+cd web && npm install && npm run dev    # development server
+cd web && npm run build                  # production build (outputs to web/dist/)
+```
+
+## Architecture Overview
+
+GoTunnel is an intranet penetration tool (similar to frp) with **server-centric configuration** - clients require zero configuration and receive mapping rules from the server after authentication.
+
+### Core Design
+
+- **Yamux Multiplexing**: Single TCP connection carries both control (auth, config, heartbeat) and data channels
+- **Binary Protocol**: `[Type(1 byte)][Length(4 bytes)][Payload(JSON)]` - see `pkg/protocol/message.go`
+- **TLS by Default**: Auto-generated self-signed ECDSA P-256 certificates, no manual setup required
+- **Embedded Web UI**: Vue.js SPA embedded in server binary via `//go:embed`
+
+### Package Structure
+
+```
+cmd/server/          # Server entry point
+cmd/client/          # Client entry point
+internal/server/
+  ├── tunnel/        # Core tunnel server, client session management
+  ├── config/        # YAML configuration loading
+  ├── db/            # SQLite storage (ClientStore interface)
+  ├── app/           # Web server, SPA handler
+  └── router/        # REST API endpoints
+internal/client/
+  └── tunnel/        # Client tunnel logic, auto-reconnect
+pkg/
+  ├── protocol/      # Message types and serialization
+  ├── crypto/        # TLS certificate generation
+  ├── proxy/         # SOCKS5 and HTTP proxy implementations
+  ├── relay/         # Bidirectional data relay (32KB buffers)
+  └── utils/         # Port availability checking
+web/                 # Vue 3 + TypeScript frontend (Vite)
+```
+
+### Key Interfaces
+
+- `ClientStore` (internal/server/db/): Database abstraction for client rules storage
+- `ServerInterface` (internal/server/router/): API handler interface
+
+### Proxy Types
+
+1. **TCP** (default): Direct port forwarding (remote_port → local_ip:local_port)
+2. **SOCKS5**: Full SOCKS5 protocol via `TunnelDialer`
+3. **HTTP**: HTTP/HTTPS proxy through client network
+
+### Data Flow
+
+External User → Server Port → Yamux Stream → Client → Local Service
+
+### Configuration
+
+- Server: YAML config + SQLite database for client rules
+- Client: Command-line flags only (server address, token, client ID)
+- Default ports: 7000 (tunnel), 7500 (web console)