public Task NewConnectionAsync(ObjectPath device, CloseSafeHandle fileDescriptor, IDictionary <string, object> properties)
{
SocketState = SocketStates.Connected;
_fileDescriptor = fileDescriptor;
Log.Debug("Linux.BluetoothSocket: Connected to profile");
Stream = new UnixStream(fileDescriptor.DangerousGetHandle().ToInt32());
Task.Run(() => NewConnection?.Invoke(device, _fileDescriptor, properties));
return(Task.CompletedTask);
}
public async Task <Message> ReceiveMessageAsync()
{
try
{
int bytesRead = await ReadCountAsync(_headerReadBuffer, 0, 16, _fileDescriptors).ConfigureAwait(false);
if (bytesRead == 0)
{
return(null);
}
if (bytesRead != 16)
{
throw new ProtocolException("Header read length mismatch: " + bytesRead + " of expected " + "16");
}
EndianFlag endianness = (EndianFlag)_headerReadBuffer[0];
MessageReader reader = new MessageReader(endianness, new ArraySegment <byte>(_headerReadBuffer));
//discard endian byte, message type and flags, which we don't care about here
reader.Seek(3);
byte version = reader.ReadByte();
if (version != ProtocolInformation.Version)
{
throw new NotSupportedException("Protocol version '" + version.ToString() + "' is not supported");
}
uint bodyLength = reader.ReadUInt32();
//discard _methodSerial
reader.ReadUInt32();
uint headerLength = reader.ReadUInt32();
int bodyLen = (int)bodyLength;
int toRead = (int)headerLength;
//we fixup to include the padding following the header
toRead = ProtocolInformation.Padded(toRead, 8);
long msgLength = toRead + bodyLen;
if (msgLength > ProtocolInformation.MaxMessageLength)
{
throw new ProtocolException("Message length " + msgLength + " exceeds maximum allowed " + ProtocolInformation.MaxMessageLength + " bytes");
}
byte[] header = new byte[16 + toRead];
Array.Copy(_headerReadBuffer, header, 16);
bytesRead = await ReadCountAsync(header, 16, toRead, _fileDescriptors).ConfigureAwait(false);
if (bytesRead != toRead)
{
throw new ProtocolException("Message header length mismatch: " + bytesRead + " of expected " + toRead);
}
var messageHeader = Header.FromBytes(new ArraySegment <byte>(header));
byte[] body = null;
//read the body
if (bodyLen != 0)
{
body = new byte[bodyLen];
bytesRead = await ReadCountAsync(body, 0, bodyLen, _fileDescriptors).ConfigureAwait(false);
if (bytesRead != bodyLen)
{
throw new ProtocolException("Message body length mismatch: " + bytesRead + " of expected " + bodyLen);
}
}
if (_fileDescriptors.Count < messageHeader.NumberOfFds)
{
throw new ProtocolException("File descriptor length mismatch: " + _fileDescriptors.Count + " of expected " + messageHeader.NumberOfFds);
}
Message msg = new Message(
messageHeader,
body,
messageHeader.NumberOfFds == 0 ? null :
_fileDescriptors.Count == messageHeader.NumberOfFds ? _fileDescriptors.ToArray() :
_fileDescriptors.Take((int)messageHeader.NumberOfFds).ToArray()
);
_fileDescriptors.RemoveRange(0, (int)messageHeader.NumberOfFds);
return(msg);
}
catch
{
foreach (var fd in _fileDescriptors)
{
CloseSafeHandle.close(fd.Handle);
}
throw;
}
}
