66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
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/*
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* server/media_relay.h — UDP SFU relay for M2 voice.
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*
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* Design: docs/architecture.md §5, docs/voice.md §2.
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* Receives encrypted UDP voice frames from clients, decrypts+authenticates them,
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* re-encrypts for each channel member, and forwards.
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*
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* Flow:
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* 1. Client sends kFrameUdpBinding UDP packet (plaintext) → MediaRelay looks up
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* the 16-byte token in SessionRegistry, associates the sender endpoint with
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* the ConnSession, and calls session->set_udp_endpoint().
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* 2. Client sends kFrameVoice UDP packets → MediaRelay decrypts via recv_crypto(),
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* finds channel members via find_channel_sessions(), re-encrypts via send_crypto(),
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* and sends to each member's UDP endpoint.
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*/
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#ifndef VOICECAT_SERVER_MEDIA_RELAY_H
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#define VOICECAT_SERVER_MEDIA_RELAY_H
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#ifdef VOICECAT_HAS_NET
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#include <memory>
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#define ASIO_STANDALONE 1
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#include <asio.hpp>
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#include "net/transport.h"
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namespace voicecat::server {
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class SessionRegistry;
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class MediaRelay {
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public:
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MediaRelay(asio::io_context& io, std::shared_ptr<SessionRegistry> registry);
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~MediaRelay();
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// Bind the UDP socket. port=0 lets the OS pick. Must be called before start().
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bool bind(uint16_t port = 0);
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// Begin async receive loop. Call once after bind().
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void start();
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// Stop receiving and close the socket.
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void stop();
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// Actual bound port (after bind()).
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uint16_t media_port() const;
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private:
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void on_udp_frame(const uint8_t* data, size_t len, asio::ip::udp::endpoint sender);
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asio::io_context& io_;
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std::shared_ptr<SessionRegistry> registry_;
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voicecat::net::UdpMediaChannel udp_;
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// Scratch buffer for re-encrypted payloads (size = max_frame + 16 MAC)
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static constexpr size_t kMaxPayload = 1500;
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std::vector<uint8_t> seal_buf_ = std::vector<uint8_t>(kMaxPayload + 16, uint8_t{0});
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std::vector<uint8_t> plain_buf_ = std::vector<uint8_t>(kMaxPayload, uint8_t{0});
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};
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} // namespace voicecat::server
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#endif // VOICECAT_HAS_NET
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#endif // VOICECAT_SERVER_MEDIA_RELAY_H
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