feat!: pre-handshake knock on the agent TCP ports; probes get the agent certificate public key [CI]

backend/tests/MoShiro.Backend.Tests/AgentEndToEndTests.cs

@@ -95,6 +95,19 @@ public sealed class AgentEndToEndTests
         }
     }
 
+    /// <summary>读到 0 字节（对端关闭）或者连接被重置，都算「没收到任何东西」；收到数据返回字节数。</summary>
+    internal static async Task<int> ReadOrResetAsync(Stream stream, byte[] buffer)
+    {
+        try
+        {
+            return await stream.ReadAsync(buffer).AsTask().WaitAsync(TimeSpan.FromSeconds(10));
+        }
+        catch (IOException)
+        {
+            return 0;
+        }
+    }
+
     [Fact]
     public async Task TcpDataPlane_ClosesConnectionsWithoutAValidFirstFrame()
     {
@@ -106,7 +119,7 @@ public sealed class AgentEndToEndTests
             await client.ConnectAsync(System.Net.IPAddress.Loopback, agent.App.TcpPorts[0]);
             await client.GetStream().WriteAsync(new byte[TcpWire.AuthBytes]); // 全零：magic 不对
             byte[] buffer = new byte[16];
-            Assert.Equal(0, await client.GetStream().ReadAsync(buffer).AsTask().WaitAsync(TimeSpan.FromSeconds(10)));
+            Assert.Equal(0, await ReadOrResetAsync(client.GetStream(), buffer)); // 连接被关闭：没有任何字节（Windows 上可能是 RST）
             await BackendFixture.EventuallyAsync(() => Task.FromResult(agent.App.Counters.DroppedInvalid >= 1));
         }
     }
@@ -146,7 +159,7 @@ public sealed class AgentEndToEndTests
 
             // The probe process restarts: a new session with its own streams; sequence numbers start from 0 again
             await using ProbeSimulator second = first.Restarted();
-            await second.ConnectAsync("127.0.0.1", agent.App.ControlPort, agent.TlsSpki, agent.App.UdpPorts[0], agent.NodeId);
+            await second.ConnectAsync("127.0.0.1", agent.App.ControlPort, agent.TlsPublicKey, agent.App.UdpPorts[0], agent.NodeId);
             LineTaskSet set = await second.WaitForTasksAsync(s => s.Tasks.Any(t => t.Kind == "udp_echo" && t.Port == agent.App.UdpPorts[0]));
             LineTask udp2 = set.Tasks.Single(t => t.Kind == "udp_echo");
             Assert.NotEqual(udp.StreamId, udp2.StreamId);
@@ -208,11 +221,11 @@ public sealed class AgentEndToEndTests
         await using AgentHarness agent = await AgentHarness.StartAsync(_backend);
         await agent.CreateProbeAsync();
         await using var stranger = new ProbeSimulator("prb_stranger", Fleet.Identity.NodeIdentity.Generate());
-        await Assert.ThrowsAnyAsync<Exception>(() => stranger.ConnectAsync("127.0.0.1", agent.App.ControlPort, agent.TlsSpki, agent.App.UdpPorts[0], agent.NodeId));
+        await Assert.ThrowsAnyAsync<Exception>(() => stranger.ConnectAsync("127.0.0.1", agent.App.ControlPort, agent.TlsPublicKey, agent.App.UdpPorts[0], agent.NodeId));
 
-        // 证书指纹不对（中间人）也不会连上
+        // 证书公钥不对（中间人）也不会连上
         await using ProbeSimulator probe = await agent.CreateProbeAsync();
-        await Assert.ThrowsAnyAsync<Exception>(() => probe.ConnectAsync("127.0.0.1", agent.App.ControlPort, new byte[32], agent.App.UdpPorts[0], agent.NodeId));
+        await Assert.ThrowsAnyAsync<Exception>(() => probe.ConnectAsync("127.0.0.1", agent.App.ControlPort, Fleet.Identity.NodeIdentity.Generate().PublicKeySpki, agent.App.UdpPorts[0], agent.NodeId));
     }
 
     [Fact]