private void ParseHeader(Int32 readed)
{
if (!TryReadHeaderUntil(ref readed, 6))
{
Close(WebSocketCloseReasons.ProtocolError);
return;
}
Int32 headerlength = WebSocketFrameHeader.GetHeaderLength(_headerBuffer.Array, _headerBuffer.Offset);
if (!TryReadHeaderUntil(ref readed, headerlength))
{
Close(WebSocketCloseReasons.ProtocolError);
return;
}
WebSocketFrameHeader header;
if (!WebSocketFrameHeader.TryParse(_headerBuffer.Array, _headerBuffer.Offset, headerlength, _keyBuffer, out header))
{
throw new WebSocketException("Cannot understand frame header");
}
CurrentHeader = header;
if (!header.Flags.Option.IsData())
{
ProcessControlFrame(_clientStream);
CurrentHeader = null;
}
else
{
_ongoingMessageAwaiting = 0;
}
}
public ArraySegment <byte> PrepareFrame(ArraySegment <byte> payload, int length, bool isCompleted, bool headerSent, WebSocketMessageType type, WebSocketExtensionFlags extensionFlags)
{
var mask = 0U;
if (this.maskData)
{
mask = unchecked ((uint)ThreadStaticRandom.NextNotZero());
}
var header = WebSocketFrameHeader.Create(length, isCompleted, headerSent, mask, (WebSocketFrameOption)type, extensionFlags);
if (header.WriteTo(payload.Array, payload.Offset - header.HeaderLength) != header.HeaderLength)
{
throw new WebSocketException("Wrong frame header written.");
}
if (this.log.IsDebugEnabled)
{
this.log.Debug($"({this.GetHashCode():X}) [FRAME->] {header}");
}
header.EncodeBytes(payload.Array, payload.Offset, length);
return(new ArraySegment <byte>(payload.Array, payload.Offset - header.HeaderLength, length + header.HeaderLength));
}
internal async Task WriteInternalAsync(ArraySegment <byte> buffer, int count, bool isCompleted, bool headerSent, WebSocketFrameOption option, WebSocketExtensionFlags extensionFlags, CancellationToken cancel)
{
try
{
var header = WebSocketFrameHeader.Create(count, isCompleted, headerSent, option, extensionFlags);
header.ToBytes(buffer.Array, buffer.Offset - header.HeaderLength);
if (!await _writeSemaphore.WaitAsync(_options.WebSocketSendTimeout, cancel).ConfigureAwait(false))
{
throw new WebSocketException("Write timeout");
}
await _clientStream.WriteAsync(buffer.Array, buffer.Offset - header.HeaderLength, count + header.HeaderLength, cancel).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
Close(WebSocketCloseReasons.GoingAway);
}
catch (InvalidOperationException)
{
Close(WebSocketCloseReasons.UnexpectedCondition);
}
catch (IOException)
{
Close(WebSocketCloseReasons.UnexpectedCondition);
}
catch (Exception ex)
{
Close(WebSocketCloseReasons.UnexpectedCondition);
throw new WebSocketException("Cannot write on WebSocket", ex);
}
finally
{
SafeEnd.ReleaseSemaphore(_writeSemaphore);
}
}
private async Task WriteInternalAsync(ArraySegment <Byte> buffer, Int32 count, Boolean isCompleted, Boolean headerSent, WebSocketFrameOption option, WebSocketExtensionFlags extensionFlags, CancellationToken cancellation)
{
CancellationTokenRegistration reg = cancellation.Register(this.Close, false);
try
{
var header = WebSocketFrameHeader.Create(count, isCompleted, headerSent, option, extensionFlags);
header.ToBytes(buffer.Array, buffer.Offset - header.HeaderLength);
if (!_writeSemaphore.Wait(_options.WebSocketSendTimeout))
{
throw new WebSocketException("Write timeout");
}
await _clientStream.WriteAsync(buffer.Array, buffer.Offset - header.HeaderLength, count + header.HeaderLength, cancellation).ConfigureAwait(false);
}
catch (InvalidOperationException)
{
Close(WebSocketCloseReasons.UnexpectedCondition);
}
catch (IOException)
{
Close(WebSocketCloseReasons.UnexpectedCondition);
}
catch (Exception ex)
{
Close(WebSocketCloseReasons.UnexpectedCondition);
throw new WebSocketException("Cannot write on WebSocket", ex);
}
finally
{
reg.Dispose();
_writeSemaphore.Release();
}
}
internal void WriteInternal(ArraySegment <Byte> buffer, Int32 count, Boolean isCompleted, Boolean headerSent, WebSocketFrameOption option, WebSocketExtensionFlags extensionFlags)
{
try
{
var header = WebSocketFrameHeader.Create(count, isCompleted, headerSent, option, extensionFlags);
header.ToBytes(buffer.Array, buffer.Offset - header.HeaderLength);
if (!_writeSemaphore.Wait(_options.WebSocketSendTimeout))
{
throw new WebSocketException("Write timeout");
}
_clientStream.Write(buffer.Array, buffer.Offset - header.HeaderLength, count + header.HeaderLength);
}
catch (InvalidOperationException)
{
Close(WebSocketCloseReasons.UnexpectedCondition);
}
catch (IOException)
{
Close(WebSocketCloseReasons.UnexpectedCondition);
}
catch (Exception ex)
{
Close(WebSocketCloseReasons.UnexpectedCondition);
throw new WebSocketException("Cannot write on WebSocket", ex);
}
finally
{
if (_isClosed == 0)
{
SafeEnd.ReleaseSemaphore(_writeSemaphore);
}
}
}
public void DisposeCurrentHeaderIfFinished()
{
if (this.CurrentHeader != null && this.CurrentHeader.RemainingBytes < 0)
{
throw new InvalidOperationException("Extra bytes are read from transport connection. Report to package developer about it.");
}
if (this.CurrentHeader != null && this.CurrentHeader.RemainingBytes == 0)
{
this.CurrentHeader = null;
}
}
private int GetBytesToRead(WebSocketFrameHeader header, int bufferSize)
{
if (bufferSize <= 0)
{
throw new ArgumentOutOfRangeException(nameof(bufferSize));
}
if (header == null)
{
return(0);
}
return((int)Math.Min(bufferSize, header.RemainingBytes));
}
private void ParseHeader(int readed)
{
if (!TryReadHeaderUntil(ref readed, 6))
{
Close(WebSocketCloseReasons.ProtocolError);
return;
}
var headerlength = WebSocketFrameHeader.GetHeaderLength(_headerBuffer.Array, _headerBuffer.Offset);
if (!TryReadHeaderUntil(ref readed, headerlength))
{
Close(WebSocketCloseReasons.ProtocolError);
return;
}
ProcessHeaderFrame(headerlength);
}
private async Task ParseHeaderAsync(int readed)
{
if (await TryReadHeaderUntilAsync(readed, 6).ConfigureAwait(false) == -1)
{
Close(WebSocketCloseReasons.ProtocolError);
return;
}
var headerlength = WebSocketFrameHeader.GetHeaderLength(_headerBuffer.Array, _headerBuffer.Offset);
if (await TryReadHeaderUntilAsync(readed, headerlength).ConfigureAwait(false) == -1)
{
Close(WebSocketCloseReasons.ProtocolError);
return;
}
await ProcessHeaderFrameAsync(headerlength).ConfigureAwait(false);
}
private async Task ReadHeader(CancellationToken cancellation)
{
Int32 readed = 0;
var success = await TryReadHeaderUntil(readed, 6, cancellation).ConfigureAwait(false);
if (!success)
{
Close(WebSocketCloseReasons.ProtocolError);
return;
}
readed += 6;
Int32 headerlength = WebSocketFrameHeader.GetHeaderLength(_headerBuffer.Array, _headerBuffer.Offset);
success = await TryReadHeaderUntil(readed, headerlength, cancellation).ConfigureAwait(false);
if (!success)
{
Close(WebSocketCloseReasons.ProtocolError);
return;
}
WebSocketFrameHeader header;
if (!WebSocketFrameHeader.TryParse(_headerBuffer.Array, _headerBuffer.Offset, headerlength, _keyBuffer, out header))
{
throw new WebSocketException("Cannot understand frame header");
}
CurrentHeader = header;
if (!header.Flags.Option.IsData())
{
ProcessControlFrame(_clientStream);
CurrentHeader = null;
}
else
{
_ongoingMessageAwaiting = 0;
}
_ping.NotifyActivity();
}
private void ProcessHeaderFrame(int headerlength)
{
if (!WebSocketFrameHeader.TryParse(_headerBuffer.Array, _headerBuffer.Offset, headerlength, _keyBuffer, out WebSocketFrameHeader header))
{
throw new WebSocketException("Cannot understand frame header");
}
CurrentHeader = header;
if (!header.Flags.Option.IsData())
{
ProcessControlFrame();
CurrentHeader = null;
}
else
{
_ongoingMessageAwaiting = 0;
}
_ping.NotifyActivity();
}
private async Task ParseHeaderAsync(int read)
{
if (read < 2)
{
if (this.log.IsWarningEnabled)
{
this.log.Warning($"{nameof(this.ParseHeaderAsync)} is called with only {read} bytes buffer. Minimal is 2 bytes.");
}
await this.CloseAsync(WebSocketCloseReasons.ProtocolError).ConfigureAwait(false);
return;
}
var headerLength = WebSocketFrameHeader.GetHeaderLength(this.headerBuffer.Array, this.headerBuffer.Offset);
if (read != headerLength)
{
if (this.log.IsWarningEnabled)
{
this.log.Warning($"{nameof(this.ParseHeaderAsync)} is called with {read} bytes buffer. While whole header is {headerLength} bytes length.");
}
await this.CloseAsync(WebSocketCloseReasons.ProtocolError).ConfigureAwait(false);
return;
}
WebSocketFrameHeader header;
if (!WebSocketFrameHeader.TryParse(this.headerBuffer.Array, this.headerBuffer.Offset, headerLength, out header))
{
throw new WebSocketException("Frame header is malformed.");
}
if (this.log.IsDebugEnabled)
{
this.log.Debug($"({this.GetHashCode():X}) [FRAME<-] {header}");
}
this.CurrentHeader = header;
if (!header.Flags.Option.IsData())
{
await this.ProcessControlFrameAsync().ConfigureAwait(false);
this.CurrentHeader = null;
}
else
{
this.ongoingMessageAwaiting = 0;
}
try
{
this.pingHandler.NotifyActivity();
}
catch (Exception notifyPingError)
{
if (this.log.IsWarningEnabled)
{
this.log.Warning($"({this.GetHashCode():X}) An error occurred while trying to call {this.pingHandler.GetType().Name}.{nameof(this.pingHandler.NotifyActivity)}() method.", notifyPingError);
}
}
}
public static bool TryParse(byte[] frameStart, int offset, int headerLength, out WebSocketFrameHeader header)
{
if (frameStart == null)
{
throw new ArgumentNullException(nameof(frameStart));
}
header = null;
var availableLength = frameStart.Length - offset;
if (availableLength < 6 || availableLength < headerLength)
{
return(false);
}
var value = frameStart[offset + 1];
var contentLength = (long)(value >= 128 ? value - 128 : value);
if (contentLength <= 125)
{
// small frame
}
else if (contentLength == 126)
{
if (availableLength < headerLength)
{
return(false);
}
contentLength = EndianBitConverter.ToUInt16Be(frameStart, offset + 2);
}
else if (contentLength == 127)
{
if (availableLength < headerLength)
{
return(false);
}
var length = EndianBitConverter.ToUInt64Be(frameStart, offset + 2);
if (length > long.MaxValue)
{
throw new WebSocketException("The maximum supported frame length is 9223372036854775807, current frame is " + length.ToString());
}
contentLength = (long)length;
}
else
{
return(false);
}
WebSocketFrameHeaderFlags flags;
if (!WebSocketFrameHeaderFlags.TryParse(frameStart, offset, out flags))
{
return(false);
}
var maskKey = 0U;
if (flags.MASK)
{
headerLength -= 4;
maskKey = EndianBitConverter.ToUInt32Le(frameStart, offset + headerLength);
}
header = new WebSocketFrameHeader
{
ContentLength = contentLength,
HeaderLength = headerLength,
Flags = flags,
RemainingBytes = contentLength,
MaskKey = maskKey
};
return(true);
}
public static Boolean TryParse(Byte[] frameStart, Int32 offset, Int32 headerLength, ArraySegment<Byte> keySegment, out WebSocketFrameHeader header)
{
header = null;
if (frameStart == null || frameStart.Length < 6 || frameStart.Length < (offset + headerLength))
return false;
Int32 value = frameStart[offset+1];
UInt64 contentLength = (UInt64)(value>=128?value - 128:value);
if (contentLength <= 125)
{
// small frame
}
else if (contentLength == 126)
{
if (frameStart.Length < headerLength)
return false;
if(BitConverter.IsLittleEndian)
frameStart.ReversePortion(offset + 2, 2);
contentLength = BitConverter.ToUInt16(frameStart, 2);
}
else if (contentLength == 127)
{
if (frameStart.Length < headerLength)
return false;
if (BitConverter.IsLittleEndian)
frameStart.ReversePortion(offset + 2, 8);
contentLength = (UInt64)BitConverter.ToUInt64(frameStart, 2);
}
else
return false;
WebSocketFrameHeaderFlags flags;
if (WebSocketFrameHeaderFlags.TryParse(frameStart, offset, out flags))
{
header = new WebSocketFrameHeader(keySegment)
{
ContentLength = contentLength,
HeaderLength = headerLength,
Flags = flags,
RemainingBytes = contentLength
};
if (flags.MASK)
{
headerLength -= 4;
for (int i = 0; i < 4; i++)
header._key.Array[header._key.Offset + i] = frameStart[offset + i + headerLength];
}
return true;
}
return false;
}
public static Boolean TryParse(Byte[] frameStart, Int32 offset, Int32 headerLength, ArraySegment <Byte> keySegment, out WebSocketFrameHeader header)
{
header = null;
if (frameStart == null || frameStart.Length < 6 || frameStart.Length < (offset + headerLength))
{
return(false);
}
Int32 value = frameStart[offset + 1];
UInt64 contentLength = (UInt64)(value >= 128?value - 128:value);
if (contentLength <= 125)
{
// small frame
}
else if (contentLength == 126)
{
if (frameStart.Length < headerLength)
{
return(false);
}
if (BitConverter.IsLittleEndian)
{
frameStart.ReversePortion(offset + 2, 2);
}
contentLength = BitConverter.ToUInt16(frameStart, 2);
}
else if (contentLength == 127)
{
if (frameStart.Length < headerLength)
{
return(false);
}
if (BitConverter.IsLittleEndian)
{
frameStart.ReversePortion(offset + 2, 8);
}
contentLength = (UInt64)BitConverter.ToUInt64(frameStart, 2);
}
else
{
return(false);
}
WebSocketFrameHeaderFlags flags;
if (WebSocketFrameHeaderFlags.TryParse(frameStart, offset, out flags))
{
header = new WebSocketFrameHeader(keySegment)
{
ContentLength = contentLength,
HeaderLength = headerLength,
Flags = flags,
RemainingBytes = contentLength
};
if (flags.MASK)
{
headerLength -= 4;
for (int i = 0; i < 4; i++)
{
header._key.Array[header._key.Offset + i] = frameStart[offset + i + headerLength];
}
}
return(true);
}
return(false);
}
public static Boolean TryParse(Byte[] frameStart, Int32 offset, Int32 headerLength, ArraySegment <Byte> keySegment, out WebSocketFrameHeader header)
{
header = null;
if (frameStart == null || frameStart.Length < 6 || frameStart.Length < (offset + headerLength))
{
return(false);
}
Int32 value = frameStart[offset + 1];
Int64 contentLength = (Int64)(value >= 128?value - 128:value);
if (contentLength <= 125)
{
// small frame
}
else if (contentLength == 126)
{
if (frameStart.Length < headerLength)
{
return(false);
}
if (BitConverter.IsLittleEndian)
{
frameStart.ReversePortion(offset + 2, 2);
}
contentLength = BitConverter.ToUInt16(frameStart, 2);
}
else if (contentLength == 127)
{
if (frameStart.Length < headerLength)
{
return(false);
}
if (BitConverter.IsLittleEndian)
{
frameStart.ReversePortion(offset + 2, 8);
}
UInt64 length = BitConverter.ToUInt64(frameStart, 2);
if (length > Int64.MaxValue)
{
throw new WebSocketException("The maximum supported frame length is 9223372036854775807, current frame is " + length.ToString());
}
contentLength = (Int64)length;
}
else
{
return(false);
}
WebSocketFrameHeaderFlags flags;
if (WebSocketFrameHeaderFlags.TryParse(frameStart, offset, out flags))
{
header = new WebSocketFrameHeader(keySegment)
{
ContentLength = contentLength,
HeaderLength = headerLength,
Flags = flags,
RemainingBytes = contentLength
};
if (flags.MASK)
{
headerLength -= 4;
for (int i = 0; i < 4; i++)
{
header._key.Array[header._key.Offset + i] = frameStart[offset + i + headerLength];
}
}
return(true);
}
return(false);
}
public static Boolean TryParse(Byte[] frameStart, Int32 offset, Int32 headerLength, ArraySegment<Byte> keySegment, out WebSocketFrameHeader header)
{
header = null;
if (frameStart == null || frameStart.Length < 6 || frameStart.Length < (offset + headerLength))
return false;
Int32 value = frameStart[offset+1];
Int64 contentLength = (Int64)(value>=128?value - 128:value);
if (contentLength <= 125)
{
// small frame
}
else if (contentLength == 126)
{
if (frameStart.Length < headerLength)
return false;
if(BitConverter.IsLittleEndian)
frameStart.ReversePortion(offset + 2, 2);
contentLength = BitConverter.ToUInt16(frameStart, 2);
}
else if (contentLength == 127)
{
if (frameStart.Length < headerLength)
return false;
if (BitConverter.IsLittleEndian)
frameStart.ReversePortion(offset + 2, 8);
UInt64 length = BitConverter.ToUInt64(frameStart, 2);
if(length > Int64.MaxValue)
{
throw new WebSocketException("The maximum supported frame length is 9223372036854775807, current frame is " + length.ToString());
}
contentLength = (Int64)length;
}
else
return false;
WebSocketFrameHeaderFlags flags;
if (WebSocketFrameHeaderFlags.TryParse(frameStart, offset, out flags))
{
header = new WebSocketFrameHeader(keySegment)
{
ContentLength = contentLength,
HeaderLength = headerLength,
Flags = flags,
RemainingBytes = contentLength
};
if (flags.MASK)
{
headerLength -= 4;
for (int i = 0; i < 4; i++)
header._key.Array[header._key.Offset + i] = frameStart[offset + i + headerLength];
}
return true;
}
return false;
}
public async Task AwaitHeaderAsync(CancellationToken cancellation)
{
this.CheckForDoubleRead();
try
{
while (this.IsConnected && this.CurrentHeader == null)
{
var buffered = 0;
var estimatedHeaderLength = 2;
// try read minimal frame first
while (buffered < estimatedHeaderLength && !cancellation.IsCancellationRequested)
{
var read = await this.networkConnection.ReadAsync(this.headerBuffer.Array, this.headerBuffer.Offset + buffered, estimatedHeaderLength - buffered, cancellation).ConfigureAwait(false);
if (read == 0)
{
buffered = 0;
break;
}
buffered += read;
if (buffered >= 2)
{
estimatedHeaderLength = WebSocketFrameHeader.GetHeaderLength(this.headerBuffer.Array, this.headerBuffer.Offset);
}
}
if (buffered == 0 || cancellation.IsCancellationRequested)
{
if (buffered == 0)
{
if (this.log.IsDebugEnabled)
{
this.log.Debug($"({this.GetHashCode():X}) Connection has been closed while async awaiting header.");
}
}
await this.CloseAsync(WebSocketCloseReasons.ProtocolError).ConfigureAwait(false);
return;
}
await this.ParseHeaderAsync(buffered).ConfigureAwait(false);
}
}
catch (Exception awaitHeaderError) when(awaitHeaderError.Unwrap() is ThreadAbortException == false)
{
if (!this.IsConnected)
{
return;
}
var awaitHeaderErrorUnwrap = awaitHeaderError.Unwrap();
if (this.log.IsDebugEnabled && awaitHeaderErrorUnwrap is OperationCanceledException == false && this.IsConnected)
{
this.log.Debug($"({this.GetHashCode():X}) An error occurred while async awaiting header.", awaitHeaderErrorUnwrap);
}
if (this.IsConnected)
{
await this.CloseAsync(WebSocketCloseReasons.ProtocolError).ConfigureAwait(false);
}
if (awaitHeaderErrorUnwrap is WebSocketException == false && awaitHeaderErrorUnwrap is OperationCanceledException == false)
{
throw new WebSocketException("Read operation on WebSocket stream is failed. More detailed information in inner exception.", awaitHeaderErrorUnwrap);
}
else
{
throw;
}
}
}
