private static void SendServerToken(UdpSocket socket)
{
var throwAway = socket.SendAsync(socket.Id.ToArray());
}
private void AcceptConnection(IAsyncResult ar)
{
UdpSocket client = null;
bool succeed = false;
AsyncState asyncState = ar.AsyncState as AsyncState;
bool shoudContinue = asyncState.Socket.IsBound;
if (!shoudContinue || !Listening)
{
return;
}
EndPoint senderIp = new IPEndPoint(IPAddress.Any, 0);
try
{
int?count = asyncState.Socket?.EndReceiveFrom(ar, ref senderIp);
var existing = csockets.Values.FirstOrDefault(p => p.RemoteEndPoint == senderIp);
if (existing == null && count == 1)
{
succeed = CollectSocket(senderIp as IPEndPoint, out client);
}
else
{
Diagnostic.DiagnosticCenter.Instance.Log?.LogException(new ArgumentException(succeed ? "Unable to setup the client connection request." : "UDP Connection request should be one byte long"));
}
}catch (System.Net.Sockets.SocketException ex)
{
/*
* Ignoring 10040, this exception happens often when client and server are on the same machine using the same IP address and port and this loop
* receives data larger than the initial expected connection buffer size.
* Also any incoming UDP package that is larger than the connection expected size will be ignored and discarded.
*/
if (ex.ErrorCode != 10040)
{
Diagnostic.DiagnosticCenter.Instance.Log?.LogException(ex);
}
}
catch (ObjectDisposedException)
{
}
catch (Exception ex)
{
Diagnostic.DiagnosticCenter.Instance.Log?.LogException(ex);
}
finally
{
byte[] dummy = new byte[1];
EndPoint endPoint = new IPEndPoint(_localEndpoint.AddressFamily == AddressFamily.InterNetwork ? IPAddress.Any : IPAddress.IPv6Any, Port);
listener.BeginReceiveFrom(dummy, 0, dummy.Length, 0, ref endPoint, new AsyncCallback(AcceptConnection), new AsyncState()
{
Socket = listener
});
}
if (succeed)
{
OnConnectionRequested?.Invoke(client);
}
else
{
Diagnostic.DiagnosticCenter.Instance.Log?.LogException(new Exception(succeed ? "Unable to setup the client connection request." : "UDP Connection request should be one byte long"));
}
}