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55 lines
2.2 KiB
C++
55 lines
2.2 KiB
C++
#pragma once
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#include "stream.hpp"
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#include "log.hpp"
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#include <charconv>
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#include <cstdint>
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#include <string>
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#include <string_view>
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#include <uvw/tcp.h>
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namespace llarp::quic::tunnel
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{
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// The server sends back a 0x00 to signal that the remote TCP connection was established and that
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// it is now accepting stream data; the client is not allowed to send any other data down the
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// stream until this comes back (any data sent down the stream before then is discarded.)
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inline constexpr std::byte CONNECT_INIT{0x00};
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// QUIC application error codes we sent on failures:
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// Failure to establish an initial connection:
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inline constexpr uint64_t ERROR_CONNECT{0x5471907};
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// Error if we receive something other than CONNECT_INIT as the initial stream data from the
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// server
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inline constexpr uint64_t ERROR_BAD_INIT{0x5471908};
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// Close error code sent if we get an error on the TCP socket (other than an initial connect
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// failure)
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inline constexpr uint64_t ERROR_TCP{0x5471909};
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// We pause reading from the local TCP socket if we have more than this amount of outstanding
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// unacked data in the quic tunnel, then resume once it drops below this.
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inline constexpr size_t PAUSE_SIZE = 64 * 1024;
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// Callbacks for network events. The uvw::TCPHandle client must contain a shared pointer to the
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// associated llarp::quic::Stream in its data, and the llarp::quic::Stream must contain a weak
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// pointer to the uvw::TCPHandle.
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// Callback when we receive data to go out over lokinet, i.e. read from the local TCP socket
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void
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on_outgoing_data(uvw::DataEvent& event, uvw::TCPHandle& client);
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// Callback when we receive data from lokinet to write to the local TCP socket
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void
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on_incoming_data(llarp::quic::Stream& stream, llarp::quic::bstring_view bdata);
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// Callback to handle and discard the first incoming 0x00 byte that initiates the stream
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void
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on_init_incoming_data(llarp::quic::Stream& stream, llarp::quic::bstring_view bdata);
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// Creates a new tcp handle that forwards incoming data/errors/closes into appropriate actions on
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// the given quic stream.
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void
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install_stream_forwarding(uvw::TCPHandle& tcp, llarp::quic::Stream& stream);
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} // namespace llarp::quic::tunnel
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