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Add the C++ TCP relay engine and run ss-tunnel on it

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One engine (src/relay/tcp) for the four TCP relays: connections live in a
fixed pool owned through PoolPtr, handshake, cipher state and buffers are
inline, timeouts are intrusive deadline lists on one timer and DNS answers
come back through generation-checked handles. A full pool refuses new
connections and pauses accepting until a slot frees.

ss-tunnel is the first user; its hand-written relay callbacks are gone.
tests/tunnel_interop.py covers every method against ss-server and
shadowsocks-rust.
This commit is contained in:
Max Lv
2026-10-14 22:53:09 +08:00
parent 78ca0af745
commit 892b45d1e5
17 changed files with 2391 additions and 857 deletions
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tests/test_crypto_aead2022_cpp.cpp
+4 -2
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@@ -92,12 +92,14 @@ const std::uint8_t kAddr[] = { 0x03, 11, 'e', 'x', 'a', 'm', 'p', 'l', 'e', '.',
std::vector<std::uint8_t> cpp_decrypt_all(sc::Aead2022TcpDecryptor &dec, const std::vector<std::uint8_t> &wire)
{
std::vector<std::uint8_t> got;
std::vector<std::uint8_t> out(sc::k2022MaxChunk);
std::vector<std::uint8_t> out(70000);
for (std::size_t off = 0; off < wire.size();) {
std::size_t n = std::min<std::size_t>(1 + randombytes_uniform(9000), wire.size() - off);
std::span<const std::uint8_t> in(wire.data() + off, n);
for (;;) {
auto step = dec.decrypt(in, out);
// Output windows of any size, down to one byte.
std::size_t room = randombytes_uniform(4) == 0 ? 1 + randombytes_uniform(16) : 1 + randombytes_uniform(70000);
auto step = dec.decrypt(in, std::span<std::uint8_t>(out).first(room));
SS_CHECK(step);
got.insert(got.end(), out.begin(), out.begin() + step->produced);
in = in.subspan(step->consumed);