AGENTS.md

.kilocode/rules-architect/AGENTS.md

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+# Architect Mode Rules for Telemt
+
+## Architecture Overview
+
+```mermaid
+graph TB
+    subgraph Entry
+        Client[Clients] --> Listener[TCP/Unix Listener]
+    end
+    
+    subgraph Proxy Layer
+        Listener --> ClientHandler[ClientHandler]
+        ClientHandler --> Handshake[Handshake Validator]
+        Handshake --> |Valid| Relay[Relay Layer]
+        Handshake --> |Invalid| Masking[Masking/TLS Fronting]
+    end
+    
+    subgraph Transport
+        Relay --> MiddleProxy[Middle-End Proxy Pool]
+        Relay --> DirectRelay[Direct DC Relay]
+        MiddleProxy --> TelegramDC[Telegram DCs]
+        DirectRelay --> TelegramDC
+    end
+```
+
+## Module Dependencies
+- [`src/main.rs`](src/main.rs) - Entry point, spawns all async tasks
+- [`src/config/`](src/config/) - Configuration loading with auto-migration
+- [`src/error.rs`](src/error.rs) - Error types, must be used by all modules
+- [`src/crypto/`](src/crypto/) - AES, SHA, random number generation
+- [`src/protocol/`](src/protocol/) - MTProto constants, frame encoding, obfuscation
+- [`src/stream/`](src/stream/) - Stream wrappers, buffer pool, frame codecs
+- [`src/proxy/`](src/proxy/) - Client handling, handshake, relay logic
+- [`src/transport/`](src/transport/) - Upstream management, middle-proxy, SOCKS support
+- [`src/stats/`](src/stats/) - Statistics and replay protection
+- [`src/ip_tracker.rs`](src/ip_tracker.rs) - Per-user IP tracking
+
+## Key Architectural Constraints
+
+### Middle-End Proxy Mode
+- Requires public IP on interface OR 1:1 NAT with STUN probing
+- Uses separate `proxy-secret` from Telegram (NOT user secrets)
+- Falls back to direct mode automatically on STUN mismatch
+
+### TLS Fronting
+- Invalid handshakes are transparently proxied to `mask_host`
+- This is critical for DPI evasion - do not change this behavior
+- `mask_unix_sock` and `mask_host` are mutually exclusive
+
+### Stream Architecture
+- Buffer pool is shared globally via Arc - prevents allocation storms
+- Frame codecs implement tokio-util Encoder/Decoder traits
+- State machine in [`src/stream/state.rs`](src/stream/state.rs) manages stream transitions
+
+### Configuration Migration
+- [`ProxyConfig::load()`](src/config/mod.rs:641) mutates config in-place
+- New fields must have sensible defaults
+- DC203 override is auto-injected for CDN/media support