private async void ProcessUdp(IAsyncResult ar)
{
try
{
if (_socket == null)
{
return;
}
EndPoint endPoint = new IPEndPoint(0, 0);
var bytesTransferred = _socket.EndReceiveFrom(ar, ref endPoint);
var remoteEndPoint = (IPEndPoint)endPoint;
if (bytesTransferred == 0)
{
return;
}
using (var data = new PooledMemoryStream(_pipe.Service.ArrayPool))
{
data.Write(_buffer, 0, bytesTransferred);
data.Position = 0;
ushort flag;
ushort sessionId;
int length;
int id;
int fragId;
using (var r = data.ToBinaryReader(true))
{
flag = r.ReadUInt16();
sessionId = r.ReadUInt16();
length = r.ReadInt32();
id = r.ReadInt32();
fragId = r.ReadInt32();
}
if (flag != 43981)
{
Logger.Warn()
.Message("Received Fragment instead of FullFragment")
.Write();
DoUdpReceive();
return;
}
var message = (CoreMessage)_protocol.Deserialize(null, data);
message.IsUdp = true;
message.RemoteEndPoint = remoteEndPoint;
Logger.Trace()
.Message("Client:{0} Received:{1}", remoteEndPoint.ToString(), message.GetType().Name)
.Write();
var holepunch = message as ServerHolepunchMessage;
if (holepunch != null)
{
var session = (ProudSession)_pipe.Service[holepunch.MagicNumber];
if (session == null)
{
Logger.Warn()
.Message("Client:{0} Invalid MagicNumber", remoteEndPoint.ToString())
.Write();
DoUdpReceive();
return;
}
Logger.Debug()
.Message("Client:{0} Received ServerHolepunch", session.HostId)
.Write();
if (session.UdpEnabled)
{
Logger.Warn()
.Message("Client:{0} UDP relaying is already enabled", session.HostId)
.Write();
DoUdpReceive();
return;
}
session.UdpSessionId = sessionId;
session.UdpEndPoint = remoteEndPoint;
Send(session, new ServerHolepunchAckMessage(holepunch.MagicNumber, remoteEndPoint));
}
else
{
// ToDo Add a lookup for UdpSessionId
var session = _pipe.Service.Sessions.Cast <ProudSession>().FirstOrDefault(s => s.UdpSessionId == sessionId);
if (session == null)
{
Logger.Warn()
.Message("Client:{0} Invalid session id", remoteEndPoint.ToString())
.Write();
}
else
{
try
{
var deferral = new DeferralManager();
_pipe.OnMessageReceived(new MessageReceivedEventArgs(session, message, deferral));
await deferral.WaitAsync().ConfigureAwait(false);
}
catch (Exception ex)
{
_pipe.Service.Pipeline.OnError(new ExceptionEventArgs(session, ex));
session.Dispose();
}
}
}
DoUdpReceive();
}
}
catch (ObjectDisposedException)
{ }
catch (Exception ex)
{
_pipe.Service.Pipeline.OnError(new ExceptionEventArgs(ex));
}
}