public void Sendpacket(UdpPacket packet, UdpSession session)
{
packet.Sequence = ++session.outSequence;
byte[] sendBuffer = packet.ToByteArray(false, Crypter);
System.Diagnostics.Debug.WriteLineIf(Debug, "Udp " + packet.ToString() + " send to " + new IPEndPoint(session.address, session.port).ToString());
serverSocket.SendTo(sendBuffer, new IPEndPoint(session.address, session.port));
}
public bool IsValidUDPSession(UdpSession session)
{
if (session.address.ToString() != ((IPEndPoint)socket.RemoteEndPoint).Address.ToString())
{
return(false);
}
if (session.sessionId != ConnectionId)
{
return(false);
}
if (obj == null)
{
return(false);
}
return(true);
}
public int RegisterSession(string remoteIp, IConnectedObjectUdp obj)
{
UdpSession session = new UdpSession();
session.address = IPAddress.Parse(remoteIp);
session.obj = obj;
obj.UdpSession = session;
lock (sessions)
{
while (true)
{
session.sessionId = StrongRandom.NextInt(int.MinValue, int.MaxValue);
if (!sessions.ContainsKey(session.sessionId))
{
sessions.Add(session.sessionId, session);
break;
}
}
}
return(session.sessionId);
}
void ReceiveFromCallback(IAsyncResult ar)
{
try
{
EndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
int bytesRead = 0;
try
{
bytesRead = serverSocket.EndReceiveFrom(ar, ref remoteEP);
}
catch (ObjectDisposedException)
{
return;
}
catch (SocketException ex)
{
System.Diagnostics.Debug.WriteLineIf(Debug, string.Format("Socket exception at UDPServer.ReceiveFromCallback(" + remoteEP.ToString() + "): " + ex.Message + ". " + ex.StackTrace));
System.Diagnostics.Debug.Assert(false, ex.Message);
StartReceive();
return;
}
IPEndPoint remoteEP_IP = (IPEndPoint)remoteEP;
UdpPacket packet = UdpPacket.Parse(buffer, true, Crypter);
StartReceive();
UdpSession session = null;
lock (sessions)
{
if (!sessions.ContainsKey(packet.UdpSessionId))
{
throw new UdpException(string.Format("Received invalid session {2} from {0}:{1}", remoteEP_IP.Address, remoteEP_IP.Port, packet.UdpSessionId));
}
session = sessions[packet.UdpSessionId];
}
if (session.port > 0 && session.port != remoteEP_IP.Port)
{
throw new UdpException(string.Format("Session {0} suddenly changed the port", packet.UdpSessionId));
}
session.port = remoteEP_IP.Port;
if (packet.Sequence <= session.inSequence) //drop
{
return;
}
session.inSequence = packet.Sequence;
if (session.inSequence >= uint.MaxValue)
{
session.inSequence = 0;
}
if (session.obj == null)
{
throw new UdpException(string.Format("Session {0} object is null", packet.UdpSessionId));
}
session.lastData = DateTime.UtcNow;
session.obj.Dispatch(packet);
System.Diagnostics.Debug.WriteLineIf(Debug, "Udp " + packet.ToString() + " received from " + remoteEP_IP.ToString());
}
catch (UdpException ex)
{
System.Diagnostics.Debug.WriteLineIf(Debug, ex.Message + "\n" + ex.StackTrace);
}
}
