From 5ce650382352c1503f40abf08129ada69402af55 Mon Sep 17 00:00:00 2001
From: bitflash-coin <bookofshamers@outlook.com>
Date: Tue, 4 Aug 2026 06:34:32 -0700
Subject: public commit

---
 src/test_btftunnel.cpp | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/test_btftunnel.cpp

(limited to 'src/test_btftunnel.cpp')

diff --git a/src/test_btftunnel.cpp b/src/test_btftunnel.cpp
new file mode 100644
index 0000000..df01da8
--- /dev/null
+++ b/src/test_btftunnel.cpp
@@ -0,0 +1,97 @@
+// Full-stack loopback test of the anonymous tunnel: relay + service + client in
+// one process on 127.0.0.1 (unit test of the logic, NOT a LAN/network test).
+// The app-facing sockets are plain TCP; the wire between them is echan over the
+// rendezvous relay. Proves CNode can use a .btf peer as an ordinary socket.
+//
+// Build (UCRT64):
+//   g++ -std=gnu++14 test_btftunnel.cpp btftunnel.cpp btfrv.cpp btfchan.cpp -lsodium -lws2_32 -o test_btftunnel.exe
+
+#include "btftunnel.h"
+#include "btfrv.h"
+#include "btfchan.h"
+#include <winsock2.h>
+#include <cstdio>
+#include <cstring>
+#include <string>
+#include <vector>
+#include <thread>
+#include <chrono>
+
+using namespace btf;
+static int g_fail = 0;
+#define CHECK(cond, name) do { \
+    if (cond) { printf("  ok   %s\n", name); } \
+    else      { printf("  FAIL %s\n", name); g_fail++; } } while(0)
+
+static const unsigned short PORT = 18444;
+
+static bool RecvN(btf_socket_t s, void* buf, int n)
+{
+    char* p = (char*)buf; int off = 0;
+    while (off < n) { int r = recv((SOCKET)s, p + off, n - off, 0); if (r <= 0) return false; off += r; }
+    return true;
+}
+static bool SendN(btf_socket_t s, const void* buf, int n)
+{
+    const char* p = (const char*)buf; int off = 0;
+    while (off < n) { int r = send((SOCKET)s, p + off, n - off, 0); if (r <= 0) return false; off += r; }
+    return true;
+}
+
+static bool g_svcOk = false;
+static std::string g_svcGot;
+
+static void ServiceThread(std::vector<unsigned char> pairing_id, std::vector<unsigned char> enc_sk, int msglen)
+{
+    RvSocket rv = RvServiceRegister("127.0.0.1", PORT, pairing_id.data());
+    if (rv == RV_INVALID) return;
+    btf_socket_t app = BtfServiceWrap(rv, enc_sk.data());
+    if (app == INVALID_SOCKET) return;
+    // Read the client's plaintext message and echo it back (as a normal socket).
+    std::vector<char> buf(msglen);
+    if (!RecvN(app, buf.data(), msglen)) { closesocket((SOCKET)app); return; }
+    g_svcGot.assign(buf.data(), msglen);
+    g_svcOk = SendN(app, buf.data(), msglen);
+    closesocket((SOCKET)app);
+}
+
+int main()
+{
+    if (!TunnelInit()) { printf("init failed\n"); return 2; }
+
+    unsigned char svc_enc_pk[32], svc_enc_sk[32];
+    ChanKeypair(svc_enc_pk, svc_enc_sk);
+    std::vector<unsigned char> pairing_id(32);
+    for (int i = 0; i < 32; i++) pairing_id[i] = (unsigned char)(i * 3 + 5);
+
+    std::string msg = "hello one-cpu-one-vote via anonymous .btf tunnel";
+    int msglen = (int)msg.size();
+
+    printf("anonymous_tunnel_full_stack\n");
+
+    std::thread relay([]{ RvRelayRun(PORT); });
+    std::this_thread::sleep_for(std::chrono::milliseconds(300));
+    std::thread svc(ServiceThread, pairing_id,
+                    std::vector<unsigned char>(svc_enc_sk, svc_enc_sk+32), msglen);
+    std::this_thread::sleep_for(std::chrono::milliseconds(300));
+
+    btf_socket_t app = BtfClientTunnel("127.0.0.1", PORT, pairing_id.data(), svc_enc_pk);
+    CHECK(app != INVALID_SOCKET, "client built anonymous tunnel to service");
+    if (app != INVALID_SOCKET)
+    {
+        CHECK(SendN(app, msg.data(), msglen), "app writes plaintext to the tunnel socket");
+        std::vector<char> echo(msglen);
+        CHECK(RecvN(app, echo.data(), msglen), "app reads echo from the tunnel socket");
+        CHECK(std::string(echo.data(), msglen) == msg, "plaintext round-trips end-to-end through the relay");
+        closesocket((SOCKET)app);
+    }
+
+    svc.join();
+    CHECK(g_svcOk && g_svcGot == msg, "service saw the correct decrypted plaintext");
+
+    RvRelayStop();
+    relay.join();
+
+    printf("\n%s (%d failures)\n", g_fail == 0 ? "ALL TESTS PASSED" : "TESTS FAILED", g_fail);
+    return g_fail == 0 ? 0 : 1;
+}
-- 
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