public async Task ServerShouldCloseTheConnectionIfCorrectPrefaceIsNotReceived()
{
var inPipe = new BufferedPipe(1024);
var outPipe = new BufferedPipe(1024);
var http2Con = BuildConnection(true, inPipe, outPipe);
var b = new byte[ClientPreface.Length];
// Initialize with non-preface data
for (var i = 0; i < b.Length; i++)
{
b[i] = 10;
}
await inPipe.WriteAsync(new ArraySegment <byte>(b));
// Wait for the response - a settings frame is expected first
// But as there's a race condition the connection could be closed
// before or after the settings frame was fully received
try
{
await outPipe.ReadAndDiscardSettings();
var hdrBuf = new byte[FrameHeader.HeaderSize + 50];
var header = await FrameHeader.ReceiveAsync(outPipe, hdrBuf);
Assert.Equal(FrameType.GoAway, header.Type);
}
catch (Exception e)
{
Assert.IsType <System.IO.EndOfStreamException>(e);
}
}
public static async Task <FrameHeader> ReadFrameHeaderWithTimeout(
this IReadableByteStream stream)
{
var headerSpace = new byte[FrameHeader.HeaderSize];
var readTask = FrameHeader.ReceiveAsync(stream, headerSpace).AsTask();
var timeoutTask = Task.Delay(5000);
var combined = Task.WhenAny(new Task[] { readTask, timeoutTask });
var done = await combined;
if (done == readTask)
{
return(readTask.Result);
}
throw new TimeoutException();
}
private async ValueTask <Http2Error?> ReadOneFrame()
{
var fh = await FrameHeader.ReceiveAsync(inputStream, receiveBuffer);
if (!settingsReceived)
{
if (fh.Type != FrameType.Settings || (fh.Flags & (byte)SettingsFrameFlags.Ack) != 0)
{
return(new Http2Error
{
StreamId = 0,
Code = ErrorCode.ProtocolError,
Message = "预期设置帧为第一帧",
});
}
}
switch (fh.Type)
{
case FrameType.Settings:
return(await HandleSettingsFrame(fh));
case FrameType.Priority:
return(await HandlePriorityFrame(fh));
case FrameType.Ping:
return(await HandlePingFrame(fh));
case FrameType.WindowUpdate:
return(await HandleWindowUpdateFrame(fh));
case FrameType.PushPromise:
return(await HandlePushPromiseFrame(fh));
case FrameType.ResetStream:
return(await HandleResetFrame(fh));
case FrameType.GoAway:
return(await HandleGoAwayFrame(fh));
case FrameType.Continuation:
return(new Http2Error
{
StreamId = 0,
Code = ErrorCode.ProtocolError,
Message = "意外的继续帧",
});
case FrameType.Data:
return(await HandleDataFrame(fh));
case FrameType.Headers:
var headerRes = await headerReader.ReadHeaders(fh, GetBuffer);
if (headerRes.Error != null)
{
return(headerRes.Error);
}
return(await HandleHeaders(headerRes.HeaderData));
default:
return(await HandleUnknownFrame(fh));
}
}
/// <summary>
/// 读取和解码包含单个头段帧和0个或多个连续帧的头段块。
/// </summary>
/// <param name="firstHeader"></param>
/// <param name="ensureBuffer"></param>
/// <returns></returns>
public async ValueTask <Result> ReadHeaders(
FrameHeader firstHeader,
Func <int, byte[]> ensureBuffer)
{
if (firstHeader.Length > maxFrameSize)
{
return(new Result
{
Error = new Http2Error
{
StreamId = 0,
Code = ErrorCode.FrameSizeError,
Message = "超过最大帧大小",
},
});
}
PriorityData?prioData = null;
var allowedHeadersSize = maxHeaderFieldsSize;
var headers = new List <HeaderField>();
var initialFlags = firstHeader.Flags;
var f = (HeadersFrameFlags)firstHeader.Flags;
var isEndOfStream = f.HasFlag(HeadersFrameFlags.EndOfStream);
var isEndOfHeaders = f.HasFlag(HeadersFrameFlags.EndOfHeaders);
var isPadded = f.HasFlag(HeadersFrameFlags.Padded);
var hasPriority = f.HasFlag(HeadersFrameFlags.Priority);
var minLength = 0;
if (isPadded)
{
minLength += 1;
}
if (hasPriority)
{
minLength += 5;
}
if (firstHeader.Length < minLength)
{
return(new Result
{
Error = new Http2Error
{
StreamId = 0,
Code = ErrorCode.ProtocolError,
Message = "帧内容大小无效",
},
});
}
byte[] buffer = ensureBuffer(firstHeader.Length);
await reader.ReadAll(new ArraySegment <byte>(buffer, 0, firstHeader.Length));
var offset = 0;
var padLen = 0;
if (isPadded)
{
padLen = buffer[0];
offset++;
}
if (hasPriority)
{
prioData = PriorityData.DecodeFrom(
new ArraySegment <byte>(buffer, offset, 5));
offset += 5;
}
var contentLen = firstHeader.Length - offset - padLen;
if (contentLen < 0)
{
return(new Result
{
Error = new Http2Error
{
StreamId = 0,
Code = ErrorCode.ProtocolError,
Message = "帧内容大小无效",
},
});
}
hpackDecoder.AllowTableSizeUpdates = true;
var decodeResult = hpackDecoder.DecodeHeaderBlockFragment(
new ArraySegment <byte>(buffer, offset, contentLen),
allowedHeadersSize,
headers);
var err = DecodeResultToError(decodeResult);
if (err != null)
{
return(new Result {
Error = err
});
}
allowedHeadersSize -= decodeResult.HeaderFieldsSize;
while (!isEndOfHeaders)
{
var contHeader = await FrameHeader.ReceiveAsync(reader, buffer);
if (contHeader.Type != FrameType.Continuation ||
contHeader.StreamId != firstHeader.StreamId ||
contHeader.Length > maxFrameSize ||
contHeader.Length == 0)
{
return(new Result
{
Error = new Http2Error
{
StreamId = 0,
Code = ErrorCode.ProtocolError,
Message = "延续帧无效",
},
});
}
var contFlags = ((ContinuationFrameFlags)contHeader.Flags);
isEndOfHeaders = contFlags.HasFlag(ContinuationFrameFlags.EndOfHeaders);
buffer = ensureBuffer(contHeader.Length);
await reader.ReadAll(new ArraySegment <byte>(buffer, 0, contHeader.Length));
offset = 0;
contentLen = contHeader.Length;
decodeResult = hpackDecoder.DecodeHeaderBlockFragment(
new ArraySegment <byte>(buffer, offset, contentLen),
allowedHeadersSize,
headers);
var err2 = DecodeResultToError(decodeResult);
if (err2 != null)
{
return(new Result {
Error = err2
});
}
allowedHeadersSize -= decodeResult.HeaderFieldsSize;
}
if (!hpackDecoder.HasInitialState)
{
return(new Result
{
Error = new Http2Error
{
Code = ErrorCode.CompressionError,
StreamId = 0u,
Message = "接收到不完整的头块",
},
});
}
return(new Result
{
Error = null,
HeaderData = new CompleteHeadersFrameData
{
StreamId = firstHeader.StreamId,
Headers = headers,
Priority = prioData,
EndOfStream = isEndOfStream,
},
});
}