public int Read(ref ArraySegment <byte> buffer, ref int offset)
{
if (buffer.Count - offset == 0)
{
return(SocketOperation.None);
}
Debug.Assert(offset == 0);
Debug.Assert(_fd != null);
int packetSize = Math.Min(MaxPacketSize, _rcvSize - UdpOverhead);
Debug.Assert(buffer.Count == 0);
buffer = new byte[packetSize];
int ret;
while (true)
{
try
{
EndPoint?peerAddr = _peerAddr;
if (peerAddr == null)
{
if (_addr.AddressFamily == AddressFamily.InterNetwork)
{
peerAddr = new IPEndPoint(IPAddress.Any, 0);
}
else
{
Debug.Assert(_addr.AddressFamily == AddressFamily.InterNetworkV6);
peerAddr = new IPEndPoint(IPAddress.IPv6Any, 0);
}
}
// TODO: Workaround for https://github.com/dotnet/corefx/issues/31182
if (_state == StateConnected ||
(AssemblyUtil.IsMacOS && _fd.AddressFamily == AddressFamily.InterNetworkV6 && _fd.DualMode))
{
ret = _fd.Receive(buffer.Array, 0, packetSize, SocketFlags.None);
}
else
{
ret = _fd.ReceiveFrom(buffer.Array, 0, packetSize, SocketFlags.None, ref peerAddr);
_peerAddr = (IPEndPoint)peerAddr;
}
break;
}
catch (System.Net.Sockets.SocketException e)
{
if (Network.RecvTruncated(e))
{
// The message was truncated and the whole buffer is filled. We ignore
// this error here, it will be detected at the connection level when
// the Ice message size is checked against the buffer size.
ret = buffer.Count;
break;
}
if (Network.Interrupted(e))
{
continue;
}
if (Network.WouldBlock(e))
{
return(SocketOperation.Read);
}
if (Network.ConnectionLost(e))
{
throw new Ice.ConnectionLostException();
}
else
{
throw new Ice.TransportException(e);
}
}
}
if (ret == 0)
{
throw new ConnectionLostException();
}
if (_state == StateNeedConnect)
{
Debug.Assert(_incoming);
//
// If we must connect, then we connect to the first peer that sends us a packet.
//
Debug.Assert(_peerAddr != null);
bool connected = Network.DoConnect(_fd, _peerAddr, null);
Debug.Assert(connected);
_state = StateConnected; // We're connected now
if (_instance.TraceLevel >= 1)
{
_instance.Logger.Trace(_instance.TraceCategory, $"connected {Transport()} socket\n{this}");
}
}
buffer = buffer.Slice(0, ret);
offset = ret;
return(SocketOperation.None);
}