Talon
2185d9d15c
The media AEAD nonce is an implicit per-direction monotonic counter; open() reconstructs it from the 14-byte header seq field (the AAD), so the contract is header.seq == the counter seal() used. The SFU relay decrypted inbound frames with the sender key, re-sealed with the recipient send_crypto (its own counter), but forwarded the sender header verbatim -- so seq carried the wrong counter and the recipient rebuilt the wrong nonce, silently dropping every relayed frame. It only worked for a single first-ever sender into a fresh recipient, which is why reverse/3rd-party audio failed. Rewrite the outgoing header seq to the recipient peek_send_counter() before re-sealing so each server->client direction is one contiguous monotonic counter and the nonce always matches. Safe: the jitter buffer orders by timestamp, not seq. No wire-format/proto/ABI change. Adds test_relay_interleaved_reseal regression coverage. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
VoiceCat
Self-hosted, native voice & text chat in the spirit of classic TeamSpeak / Mumble —
channel-based voice, channel + private text, one server you run yourself. Plain TCP
(control) and UDP (media), no WebRTC. Encrypted by default. A shared C++ core
(libvoicecat) drives native clients (Swift on macOS/iOS, C# on Windows) and the server.
Status: pre-implementation. The design is complete in
docs/. The code is an M0 skeleton — it compiles and links, but every subsystem is a stub. SeeAGENTS.mdto start building, anddocs/roadmap.mdfor the milestones.
Read the design first
The docs/ folder is the source of truth. Start at docs/README.md,
then architecture → protocol → voice → security → tech-stack → deployment →
roadmap.
Build the skeleton (no dependencies needed yet)
The M0 skeleton builds with just a C++20 compiler + CMake + Ninja — no vcpkg, no third-party libraries, because every subsystem is currently a stub.
cmake --preset dev
cmake --build --preset dev
ctest --preset dev # runs the smoke test (links the core, calls the C ABI)
Artifacts land in build/dev/bin/ (voicecat-server, vccli).
When you start implementing a subsystem that needs real libraries, build with vcpkg deps:
# one-time: git clone https://github.com/microsoft/vcpkg && ./vcpkg/bootstrap-vcpkg.sh
export VCPKG_ROOT=/path/to/vcpkg # set VCPKG_ROOT (works on Linux/macOS/Windows)
cmake --preset server-release # auto-installs deps from vcpkg.json
cmake --build --preset server-release
Layout
docs/ design spec (read this)
core/ libvoicecat — the shared C++ core
include/ voicecat.h (the C ABI all clients call)
proto/ voicecat.proto (control-plane wire format, source of truth)
src/ net/ crypto/ codec/ protocol/ session/ audio/ (stubs today)
server/ voicecat-server (headless; links the core)
tools/vccli/ headless test client — drives the protocol from M1 on
clients/ apple/ (Swift, M4) windows/ (C#, M4) — placeholders for now
tests/ CTest targets
License
Permissive-only dependencies (no GPL/LGPL) so the project can be redistributed freely,
including closed-source. Project license: TBD (see docs/tech-stack.md §5).