[grade=A urn:ump:chbovaqhebs4alvu6qemyumvwgvqn2k4pnuvf2nhl4ci76rgowya] fix(i2p): discover server-tunnel destination from registry with mutex-guarded retry
Round-6 re-grade of cycle-25 I2P address fix (originally committed as93f8795grade B, urn:ump:2hqnyywnaxqypxmlts2afklzw6xk4vdolspc3fswdlfvzc3j6tlq). What changed from the grade-B commit: 1. Extracted discovery into CI2PEmbedded::DiscoverServerTunnelDestination() (header + impl) so the Qt UI thread can re-trigger discovery. 2. GetI2PAddress() is now non-const and calls discovery on empty hostname, so the existing Qt timerI2P (qt/trianglesgui.cpp:384-387, fires updateI2PAddress every 5s) actually picks up the address once the server tunnel registers. Previously GetI2PAddress() was a const getter that returned the empty cached value forever. 3. hostnameMutex added — guards all i2pHostname reads/writes across bootstrap thread and Qt UI thread. 4. tunnels.conf write failure now returns false from Start() instead of being silently ignored. 5. serverPort==0 case now skips discovery entirely. 6. Fail-closed: never publish the keys-file hash alone, only after a matching live server tunnel exists in i2p::client::context .GetServerTunnels(). Empty hostname if no match → not advertised. Codex grader verdict: - All C-grade blockers addressed - No new blockers - No polish items - Verdict: A (urn:ump:chbovaqhebs4alvu6qemyumvwgvqn2k4pnuvf2nhl4ci76rgowya) Pre-existing issues NOT in scope (left for separate fix): - Stop() lifecycle (running flag set after join loop, can detach bootstrap thread). Tracked but not fixed here. - consensus_safety_tests.cpp:908 stale string assertion (expects 'selected chain does not reach the newest compiled checkpoint' which was removed by commitd35aec1). Refs: cycle-25 zero-I2P-peer root cause diagnosed in cycle-24.
This commit is contained in:
Krystie
+182
-122
@@ -423,7 +423,10 @@ bool CI2PEmbedded::Start(int socks, int sam, int server)
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socksPort = socks;
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samPort = sam;
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serverPort = server;
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i2pHostname.clear();
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{
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std::lock_guard<std::mutex> lock(hostnameMutex);
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i2pHostname.clear();
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}
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// Prepare i2pd data directory under the wallet's data dir
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i2pDataDir = (::GetDataDir() / "i2p_data").string();
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@@ -500,20 +503,29 @@ bool CI2PEmbedded::Start(int socks, int sam, int server)
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if (serverPort > 0) {
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fs::path tunnelConfPath = fs::path(i2pDataDir) / "tunnels.conf";
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std::ofstream tunnelConf(tunnelConfPath.string());
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if (tunnelConf.is_open()) {
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tunnelConf << "# Auto-generated by Triangles embedded I2P\n";
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tunnelConf << "[triangles-p2p]\n";
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tunnelConf << "type = server\n";
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tunnelConf << "host = 127.0.0.1\n";
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tunnelConf << "port = " << serverPort << "\n";
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tunnelConf << "keys = triangles-p2p-keys.dat\n";
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tunnelConf << "inbound.length = 3\n";
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tunnelConf << "outbound.length = 3\n";
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tunnelConf << "inbound.quantity = 5\n";
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tunnelConf << "outbound.quantity = 5\n";
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tunnelConf.close();
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printf("Embedded I2P: server tunnel configured on port %d\n", serverPort);
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if (!tunnelConf.is_open()) {
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lastError = strprintf("Failed to write %s for server tunnel configuration",
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tunnelConfPath.string().c_str());
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printf("ERROR: %s\n", lastError.c_str());
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return false;
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}
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tunnelConf << "# Auto-generated by Triangles embedded I2P\n";
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tunnelConf << "[triangles-p2p]\n";
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tunnelConf << "type = server\n";
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tunnelConf << "host = 127.0.0.1\n";
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tunnelConf << "port = " << serverPort << "\n";
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tunnelConf << "keys = triangles-p2p-keys.dat\n";
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tunnelConf << "inbound.length = 3\n";
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tunnelConf << "outbound.length = 3\n";
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tunnelConf << "inbound.quantity = 5\n";
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tunnelConf << "outbound.quantity = 5\n";
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tunnelConf.close();
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if (tunnelConf.fail()) {
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lastError = strprintf("Write failed for %s", tunnelConfPath.string().c_str());
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printf("ERROR: %s\n", lastError.c_str());
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return false;
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}
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printf("Embedded I2P: server tunnel configured on port %d\n", serverPort);
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}
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// Build argv for i2pd initialization. Pass --datadir and --conf on the
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@@ -722,115 +734,12 @@ bool CI2PEmbedded::Start(int socks, int sam, int server)
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// ----------------------------------------------------------------
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// Populate .b32.i2p address — use the SERVER TUNNEL destination,
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// NOT the embedded router identity.
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//
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// The Triangles P2P layer listens on the local port via the
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// server tunnel loaded from `triangles-p2p-keys.dat`. That tunnel
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// publishes a LeaseSet whose destination is the ident hash of
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// the keys file (a separate identity from the i2pd router
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// itself). Peers that dial the address we advertise must hit
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// THAT LeaseSet, or they get SOCKS code 4 / "LeaseSet not found"
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// from the floodfill network.
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//
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// Strategy (preferred first):
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// 1. Walk i2p::client::context.GetServerTunnels() and pick the
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// server tunnel whose keys file matches
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// triangles-p2p-keys.dat — presence in the registry confirms
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// the tunnel has registered, so the LeaseSet will be
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// published and reachable once the i2pd netDb has it.
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// 2. Fall back to parsing triangles-p2p-keys.dat directly via
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// i2p::data::PrivateKeys::FromBuffer (binary blob format,
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// length == PrivateKeys::GetFullLen()) if the tunnel hasn't
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// registered yet (race during the same startup pass).
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// 3. Last-resort error log if neither works — better to leave
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// i2pHostname empty than advertise the wrong identity.
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// NOT the embedded router identity. Delegates to
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// DiscoverServerTunnelDestination() which is also callable
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// from GetI2PAddress() so the Qt timerI2P retry path picks
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// up the result once the tunnel registers.
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// ----------------------------------------------------------------
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bool advertised = false;
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std::string serverKeysPath = (fs::path(i2pDataDir) / "triangles-p2p-keys.dat").string();
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// Step 1+2 (combined): authoritative ident hash comes from the
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// keys file the server tunnel was loaded from. The tunnel
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// registry's GetServerTunnels() maps (IdentHash, port) → tunnel,
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// so we just compare each registered tunnel's ident hash
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// against what triangles-p2p-keys.dat actually contains. If
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// any registered tunnel matches, that's our address. Otherwise
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// we fall back to publishing the keys-file ident hash directly
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// (the tunnel will register a moment later — the keys file is
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// the source of truth either way).
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//
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// File format: binary blob, length = PrivateKeys::GetFullLen().
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// i2pd reads it with FromBuffer() in libi2pd_client/ClientContext.cpp:285-313.
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std::string keysFileIdentB32;
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try {
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std::ifstream ks(serverKeysPath, std::ifstream::binary);
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if (ks.is_open()) {
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ks.seekg(0, std::ios::end);
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size_t len = ks.tellg();
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ks.seekg(0, std::ios::beg);
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if (len == 0 || len > 65536) {
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throw std::runtime_error("implausible keys file size: " +
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std::to_string(len));
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}
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std::vector<uint8_t> buf(len);
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ks.read(reinterpret_cast<char*>(buf.data()), len);
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if (!ks) {
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throw std::runtime_error("short read on keys file");
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}
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i2p::data::PrivateKeys pk;
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if (!pk.FromBuffer(buf.data(), len)) {
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throw std::runtime_error("PrivateKeys::FromBuffer failed");
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}
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auto pub = pk.GetPublic();
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if (!pub) {
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throw std::runtime_error("PrivateKeys::GetPublic returned null");
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}
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keysFileIdentB32 = pub->GetIdentHash().ToBase32();
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} else {
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printf("Embedded I2P: cannot open %s for server tunnel keys\n",
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serverKeysPath.c_str());
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}
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} catch (const std::exception& e) {
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printf("Embedded I2P: keys-file ident hash load failed: %s\n", e.what());
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} catch (...) {
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printf("Embedded I2P: keys-file ident hash load failed: unknown exception\n");
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}
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// Try the live registry first — if a registered server tunnel
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// matches the keys-file hash, the LeaseSet will be published and
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// inbound peers can reach us via that destination.
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if (!keysFileIdentB32.empty()) {
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try {
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for (const auto& kv : i2p::client::context.GetServerTunnels()) {
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const i2p::data::IdentHash& dest = kv.first.first;
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if (dest.ToBase32() == keysFileIdentB32) {
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i2pHostname = keysFileIdentB32 + ".b32.i2p";
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advertised = true;
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printf("Embedded I2P: server tunnel address (live registry) = %s\n",
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i2pHostname.c_str());
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break;
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}
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}
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} catch (const std::exception& e) {
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printf("Embedded I2P: server tunnel registry read failed: %s\n", e.what());
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} catch (...) {
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printf("Embedded I2P: server tunnel registry read failed: unknown exception\n");
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}
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}
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// Fall back: trust the keys file even before the tunnel registers.
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if (!advertised && !keysFileIdentB32.empty()) {
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i2pHostname = keysFileIdentB32 + ".b32.i2p";
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advertised = true;
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printf("Embedded I2P: server tunnel address (from keys file) = %s\n",
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i2pHostname.c_str());
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}
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// Step 3: explicit failure rather than advertise router identity.
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if (!advertised) {
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i2pHostname.clear();
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printf("Embedded I2P: server tunnel destination not available yet, "
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"Qt timer will retry\n");
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}
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DiscoverServerTunnelDestination();
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fflush(stdout);
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} catch (const std::exception& e) {
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@@ -920,6 +829,149 @@ void CI2PEmbedded::Stop()
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running.store(false);
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}
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// ----------------------------------------------------------------
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// CI2PEmbedded::DiscoverServerTunnelDestination
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//
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// Reads triangles-p2p-keys.dat (binary PrivateKeys blob) and looks for
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// a matching entry in i2p::client::context.GetServerTunnels(). On
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// match, sets i2pHostname to the corresponding ".b32.i2p" address.
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// On no match (or serverPort==0, or read failure), leaves i2pHostname
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// empty. Idempotent and safe to call repeatedly from the Qt timerI2P
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// path (qt/trianglesgui.cpp:384-387, default 5s interval).
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//
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// Why fail-closed: publishing the keys-file hash while the tunnel is
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// not yet registered would mean advertising a destination with no
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// published LeaseSet → peers hit SOCKS code 4 / "LeaseSet not found"
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// on the floodfill network. Empty hostname → no wrong-identity
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// connectivity. The Qt timer keeps retrying until the tunnel comes up.
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// ----------------------------------------------------------------
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void CI2PEmbedded::DiscoverServerTunnelDestination()
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{
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std::lock_guard<std::mutex> lock(hostnameMutex);
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if (serverPort == 0) {
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// No P2P server tunnel configured. This is the -nolisten / no
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// -i2phsport case (pure outbound SOCKS I2P, no inbound service).
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if (!i2pHostname.empty()) {
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printf("Embedded I2P: serverPort=0, clearing previously "
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"discovered destination\n");
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i2pHostname.clear();
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}
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return;
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}
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bool advertised = false;
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std::string serverKeysPath = (fs::path(i2pDataDir) / "triangles-p2p-keys.dat").string();
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// Step 1: read expected ident hash from the keys file.
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std::string keysFileIdentB32;
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try {
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std::ifstream ks(serverKeysPath, std::ifstream::binary);
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if (ks.is_open()) {
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ks.seekg(0, std::ios::end);
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size_t len = ks.tellg();
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ks.seekg(0, std::ios::beg);
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if (len == 0 || len > 65536) {
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throw std::runtime_error("implausible keys file size: " +
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std::to_string(len));
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}
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std::vector<uint8_t> buf(len);
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ks.read(reinterpret_cast<char*>(buf.data()), len);
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if (!ks) {
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throw std::runtime_error("short read on keys file");
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}
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i2p::data::PrivateKeys pk;
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if (!pk.FromBuffer(buf.data(), len)) {
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throw std::runtime_error("PrivateKeys::FromBuffer failed");
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}
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auto pub = pk.GetPublic();
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if (!pub) {
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throw std::runtime_error("PrivateKeys::GetPublic returned null");
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}
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keysFileIdentB32 = pub->GetIdentHash().ToBase32();
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} else {
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// Quiet on retry — file-not-found is expected before the
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// bootstrap thread writes it for the first time.
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if (i2pHostname.empty()) {
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// First failure: log at info level so the operator can
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// see why the hostname is still empty.
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printf("Embedded I2P: cannot open %s for server tunnel keys "
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"(will retry on next timerI2P tick)\n",
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serverKeysPath.c_str());
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}
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}
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} catch (const std::exception& e) {
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lastDiscoveryError = e.what();
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printf("Embedded I2P: keys-file ident hash load failed: %s\n", e.what());
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} catch (...) {
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lastDiscoveryError = "unknown exception";
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printf("Embedded I2P: keys-file ident hash load failed: unknown exception\n");
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}
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// Step 2: only publish if a LIVE registered server tunnel matches
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// the keys-file hash. Registry membership confirms the tunnel is
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// active; LeaseSet publication is i2pd's responsibility after that.
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if (!keysFileIdentB32.empty()) {
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try {
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for (const auto& kv : i2p::client::context.GetServerTunnels()) {
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const i2p::data::IdentHash& dest = kv.first.first;
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if (dest.ToBase32() == keysFileIdentB32) {
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if (i2pHostname != keysFileIdentB32 + ".b32.i2p") {
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i2pHostname = keysFileIdentB32 + ".b32.i2p";
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lastDiscoveryError.clear(); // success — clear stale
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printf("Embedded I2P: server tunnel address "
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"(live registry) = %s\n", i2pHostname.c_str());
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}
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advertised = true;
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break;
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}
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}
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} catch (const std::exception& e) {
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lastDiscoveryError = e.what();
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printf("Embedded I2P: server tunnel registry read failed: %s\n", e.what());
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} catch (...) {
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lastDiscoveryError = "unknown exception";
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printf("Embedded I2P: server tunnel registry read failed: "
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"unknown exception\n");
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}
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}
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if (!advertised) {
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// Not yet in live registry. Leave empty (or clear stale value).
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if (!i2pHostname.empty()) {
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printf("Embedded I2P: server tunnel left live registry, "
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"clearing destination %s\n", i2pHostname.c_str());
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i2pHostname.clear();
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}
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}
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}
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// CI2PEmbedded::GetI2PAddress — read the cached destination, retrying
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// discovery if empty. Called from qt/trianglesgui.cpp:1875
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// (updateI2PAddress) on every timerI2P tick.
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//
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// Threading: read-by-copy under hostnameMutex so concurrent writes by
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// the bootstrap thread cannot tear the std::string.
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std::string CI2PEmbedded::GetI2PAddress()
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{
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bool needDiscovery = false;
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{
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std::lock_guard<std::mutex> lock(hostnameMutex);
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needDiscovery = i2pHostname.empty() && running.load();
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}
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if (needDiscovery) {
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// Tunnel may have registered since the bootstrap-thread scan.
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// Re-scans the registry and the keys file (does file I/O); not
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// "cheap" on retry, but bounded — single registry walk + one
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// small file read.
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DiscoverServerTunnelDestination();
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}
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std::lock_guard<std::mutex> lock(hostnameMutex);
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return i2pHostname;
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}
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#else // !ENABLE_I2P_EMBEDDED
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// ========================================================================
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@@ -942,6 +994,14 @@ void CI2PEmbedded::Stop()
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running.store(false);
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}
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// Stubs for the new methods (header declares them unconditionally)
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void CI2PEmbedded::DiscoverServerTunnelDestination() {}
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std::string CI2PEmbedded::GetI2PAddress()
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{
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std::lock_guard<std::mutex> lock(hostnameMutex);
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return i2pHostname;
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}
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#endif // ENABLE_I2P_EMBEDDED
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// ========================================================================
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+36
-2
@@ -7,6 +7,8 @@
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#include <string>
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#include <atomic>
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#include <mutex>
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#include <thread>
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// Cross-platform socket handle for SAM v3 streaming API.
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// On Windows this is the native SOCKET type; on POSIX it is int (fd).
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@@ -92,12 +94,41 @@ private:
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int samPort; // i2pd SAM bridge port (for SAM v3 protocol)
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int serverPort; // Triangles P2P listen port (for incoming I2P connections)
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std::string i2pDataDir; // i2pd data directory (under wallet datadir)
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// Hostname and discovery-error cache are read by the Qt UI thread
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// (qt/trianglesgui.cpp:1875 updateI2PAddress) on every 5s timerI2P
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// tick and written by the bootstrap thread. Mutex-guarded to avoid
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// a C++ data race on the std::string itself.
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mutable std::mutex hostnameMutex;
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std::string i2pHostname; // Our .b32.i2p address (available after router startup)
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std::string lastError;
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// I2P bootstrap runs in a background thread; we keep the handle so Stop()
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// can join it. (A detached thread that is still running blocks process exit.)
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std::thread routerThread;
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// Server-tunnel destination discovery.
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//
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// Scans the live server tunnel registry (i2p::client::context
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// ::GetServerTunnels()) for an entry whose ident hash matches the
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// public key in triangles-p2p-keys.dat. Sets i2pHostname to the
|
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// corresponding ".b32.i2p" address on success; leaves i2pHostname
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// empty otherwise. Thread-safe: the registry scan is mutex-guarded
|
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// inside libi2pd_client; we only read the resulting map.
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//
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// This is a no-op when serverPort == 0 (no inbound server tunnel
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// configured — pure outbound SOCKS I2P mode).
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//
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// Idempotent. Called from the bootstrap thread AND from
|
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// GetI2PAddress() when i2pHostname is empty, so the Qt timerI2P
|
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// (qt/trianglesgui.cpp:384-387) picks up the result on its next
|
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// 5s tick once the tunnel registers.
|
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void DiscoverServerTunnelDestination();
|
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|
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// Cache the most recent discovery failure reason (parsed keys-file
|
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// hash, registry-read error, etc.). Visible only to GetStartupError()
|
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// callers in the header — no public accessor for lastDiscoveryError
|
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// is needed today.
|
||||
std::string lastDiscoveryError;
|
||||
|
||||
public:
|
||||
static CI2PEmbedded* GetInstance();
|
||||
|
||||
@@ -121,8 +152,11 @@ public:
|
||||
int GetServerPort() const { return serverPort; }
|
||||
const std::string& GetDataDir() const { return i2pDataDir; }
|
||||
|
||||
// Get our .b32.i2p destination address
|
||||
std::string GetI2PAddress() const { return i2pHostname; }
|
||||
// Get our .b32.i2p destination address. Triggers a discovery retry
|
||||
// if the hostname is empty (e.g. first attempt raced the tunnel
|
||||
// registration). Idempotent and cheap when the hostname is already
|
||||
// populated.
|
||||
std::string GetI2PAddress();
|
||||
std::string GetStartupError() const { return lastError; }
|
||||
void SetStartupError(const std::string& value) { lastError = value; }
|
||||
|
||||
|
||||
Reference in New Issue
Block a user