79 lines
3.2 KiB
C#
79 lines
3.2 KiB
C#
using System.Net;
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using System.Net.Sockets;
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using MoShiro.Measurement;
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using MoShiro.Protocol;
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using MoShiro.TestSupport;
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namespace MoShiro.Backend.Tests;
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/// <summary>数据面协议拒绝错误首帧、伪造包、重放包和垃圾数据。</summary>
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[Trait("Category", "Slow")]
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public sealed class AgentDataPlaneTests : IClassFixture<BackendFixture>
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{
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private readonly BackendFixture _backend;
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public AgentDataPlaneTests(BackendFixture backend)
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{
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_backend = backend;
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}
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private async Task<(AgentHarness Agent, DialerSimulator Dialer, LineTask Udp)> LineAsync()
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{
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AgentHarness agent = await AgentHarness.StartAsync(_backend);
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await agent.OverrideLineTasksAsync(rateHz: 30);
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DialerSimulator dialer = await agent.ConnectDialerAsync();
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LineTaskSet set = await dialer.WaitForTasksAsync(s => s.Tasks.Any(t => t.Kind == "quic_ping" && t.Port == agent.App.QuicPorts[0]));
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return (agent, dialer, set.Tasks.Single(t => t.Kind == "quic_ping"));
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}
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[Fact]
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public async Task TcpDataPlane_ClosesConnectionsWithoutAValidFirstFrame()
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{
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(AgentHarness agent, DialerSimulator dialer, _) = await LineAsync();
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await using (agent)
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await using (dialer)
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{
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using var client = new TcpClient();
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await client.ConnectAsync(IPAddress.Loopback, agent.App.TcpPorts[0]);
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await client.GetStream().WriteAsync(new byte[TcpWire.AuthBytes]); // 全零：magic 不对
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byte[] buffer = new byte[16];
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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）
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await BackendFixture.EventuallyAsync(() => Task.FromResult(agent.App.Counters.DroppedInvalid >= 1));
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}
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}
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[Fact]
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public async Task DataPlane_DropsForgedReplayedAndGarbagePackets_WithoutAnswering()
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{
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(AgentHarness agent, DialerSimulator dialer, LineTask udp) = await LineAsync();
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await using (agent)
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await using (dialer)
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{
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long before = agent.App.Counters.DroppedInvalid;
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await dialer.SendRawUdpAsync([1, 2, 3]);
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await dialer.SendRawUdpAsync(new byte[64]);
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await dialer.SendForgedEchoAsync(udp, 1);
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await BackendFixture.EventuallyAsync(() => Task.FromResult(agent.App.Counters.DroppedInvalid - before >= 3), because: "garbage and forged packets are counted");
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// 重放：同一个序号发两次，只有第一次被接受
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await dialer.SendEchoAsync(udp, 500);
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await BackendFixture.EventuallyAsync(() => Task.FromResult(agent.App.Counters.PacketsOut >= 1));
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long dropped = agent.App.Counters.DroppedInvalid;
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await dialer.SendEchoAsync(udp, 500);
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await BackendFixture.EventuallyAsync(() => Task.FromResult(agent.App.Counters.DroppedInvalid > dropped), because: "a replayed packet is dropped");
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}
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}
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private static async Task<int> ReadOrResetAsync(Stream stream, byte[] buffer)
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{
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try
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{
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return await stream.ReadAsync(buffer).AsTask().WaitAsync(TimeSpan.FromSeconds(10));
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}
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catch (IOException)
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{
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return 0;
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}
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}
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}
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