Features Implemented

Core Functionality

• HTTP + WebSocket server for real-time bidirectional communication
• Web-based UI accessible at http://localhost:7373/
• Token-based authentication with cryptographically secure tokens (64 hex chars)
• Real-time message synchronization between CLI and browser
• QR code display for easy mobile connection (via qrcode-terminal)

Security Features

• Rate limiting: Max 5 auth attempts per minute per IP
• Connection limits: Max 5 concurrent connections
• Message size validation: Max 1MB per WebSocket message
• Idle timeout: 30-minute session timeout for inactive connections
• HTML sanitization: XSS prevention via explicit character escaping
• Security headers: X-Content-Type-Options, X-Frame-Options, X-XSS-Protection
• Token transmission via WebSocket messages (not URL parameters)
• WSS support option for encrypted connections

User Interface

• Clean, modern web UI with gradient background
• Security warning banner for non-encrypted connections
• Real-time connection status indicator
• Token display with copy-friendly formatting
• WebSocket connection status (Connecting → Connected)
• Message area showing conversation history
• Input field for sending messages to CLI

CLI Integration

• Slash command: /remote-control
• CLI subcommand: qwen remote-control
• Custom options: --port, --host, --name, --stop
• Clear startup messages with connection details
• Graceful shutdown on Ctrl+C

Files Added

• docs/remote-control.md - User documentation
• packages/cli/src/remote-control/types.ts - Protocol type definitions
• packages/cli/src/remote-control/server/RemoteControlServer.ts - Server implementation
• packages/cli/src/remote-control/server/RemoteControlServer.test.ts - Unit tests
• packages/cli/src/remote-control/utils/htmlSanitizer.ts - Security utilities
• packages/cli/src/remote-control/index.ts - Module exports
• packages/cli/src/commands/remote-control/index.ts - CLI subcommand
• packages/cli/src/ui/commands/remoteControlCommand.ts - Slash command

Files Modified

• packages/cli/package.json - Added ws, @types/ws dependencies
• packages/cli/src/config/config.ts - Registered remote-control subcommand
• packages/cli/src/services/BuiltinCommandLoader.ts - Registered slash command

Known Limitations

Current Limitations (Intentional)

1. Local-only by default: Server binds to localhost for security
2. No encryption by default: Uses plain WS, WSS must be explicitly enabled
3. Single session: Only one CLI session can be controlled at a time
4. No file uploads: Cannot upload files through web interface
5. Limited tool execution: Some CLI tools require local terminal access

Future Enhancements (Not Implemented)

1. Mobile app integration: No dedicated mobile app (web UI is responsive)
2. Public relay: No external relay server (like claude.ai/code)
3. Access control lists: No IP whitelisting/blacklisting
4. Session revocation: Cannot kick specific connected clients
5. Audit logging: No security event logging
6. Metrics/monitoring: No Prometheus-style metrics endpoint
7. Token rotation: Tokens don't rotate during session lifetime
8. Multi-factor auth: Single token authentication only

Security Considerations

Production Deployment Requirements

Before deploying to production or internet-facing environments:

• Enable WSS (WebSocket Secure) - set secure: true in config
• Configure firewall rules to restrict access
• Consider implementing IP whitelisting
• Enable audit logging for security events
• Set up monitoring for connection metrics
• Define token rotation policy
• Create incident response plan for compromised tokens

Recommended Use Cases

✅ Safe to use:

• Local development (localhost only)
• Trusted internal networks
• Second screen monitoring
• Screen sharing alternative

⚠️ Use with caution:

• External network access (requires WSS)
• Public internet exposure (requires additional security measures)

❌ Not recommended without additional security:

• Production environments without WSS
• Public networks without firewall rules
• Sensitive/confidential work without encryption

Testing

All tests pass:

# Unit tests
bun test packages/cli/src/remote-control/server/RemoteControlServer.test.ts

# UX flow test
node test-ux-flow.js

# Manual testing
node test-remote-control-launcher.js

Related Issues

Fixes: QwenLM#1946 (Request remote-control Feature)