/// <summary>
/// Internal constructor for UDP connections
/// </summary>
/// <param name="connectionInfo"></param>
/// <param name="defaultSendReceiveOptions"></param>
/// <param name="level"></param>
/// <param name="listenForIncomingPackets"></param>
/// <param name="existingConnection"></param>
private UDPConnection(ConnectionInfo connectionInfo, SendReceiveOptions defaultSendReceiveOptions, UDPOptions level, bool listenForIncomingPackets, UDPConnection existingConnection = null)
: base(connectionInfo, defaultSendReceiveOptions)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Trace("Creating new UDPConnection with " + connectionInfo);
}
UDPOptions = level;
if (listenForIncomingPackets && existingConnection != null)
{
throw new Exception("Unable to listen for incoming packets if an existing client has been provided. This is to prevent possible multiple accidently listens on the same client.");
}
if (existingConnection == null)
{
if (connectionInfo.RemoteEndPoint.Address.Equals(IPAddress.Any) || connectionInfo.RemoteEndPoint.Address.Equals(IPAddress.IPv6Any))
{
#if WINDOWS_PHONE
//We are creating an unbound endPoint, this is currently the rogue UDP sender and listeners only
socket = new DatagramSocket();
if (listenForIncomingPackets)
{
socket.MessageReceived += socket_MessageReceived;
}
socket.BindEndpointAsync(new HostName(ConnectionInfo.LocalEndPoint.Address.ToString()), ConnectionInfo.LocalEndPoint.Port.ToString()).AsTask().Wait();
#else
//We are creating an unbound endPoint, this is currently the rogue UDP sender and listeners only
udpClientThreadSafe = new UdpClientThreadSafe(new UdpClient(ConnectionInfo.LocalEndPoint));
#endif
}
else
{
//If this is a specific connection we link to a default end point here
isIsolatedUDPConnection = true;
#if WINDOWS_PHONE
if (ConnectionInfo.LocalEndPoint == null)
{
socket = new DatagramSocket();
if (listenForIncomingPackets)
{
socket.MessageReceived += socket_MessageReceived;
}
socket.ConnectAsync(new HostName(ConnectionInfo.RemoteEndPoint.Address.ToString()), ConnectionInfo.RemoteEndPoint.Port.ToString()).AsTask().Wait();
}
else
{
socket = new DatagramSocket();
if (listenForIncomingPackets)
{
socket.MessageReceived += socket_MessageReceived;
}
EndpointPair pair = new EndpointPair(new HostName(ConnectionInfo.LocalEndPoint.Address.ToString()), ConnectionInfo.LocalEndPoint.Port.ToString(),
new HostName(ConnectionInfo.RemoteEndPoint.Address.ToString()), ConnectionInfo.RemoteEndPoint.Port.ToString());
socket.ConnectAsync(pair).AsTask().Wait();
}
#else
if (ConnectionInfo.LocalEndPoint == null)
{
udpClientThreadSafe = new UdpClientThreadSafe(new UdpClient(ConnectionInfo.RemoteEndPoint.AddressFamily));
}
else
{
udpClientThreadSafe = new UdpClientThreadSafe(new UdpClient(ConnectionInfo.LocalEndPoint));
}
//By calling connect we discard packets from anything other then the provided remoteEndPoint on our localEndPoint
udpClientThreadSafe.Connect(ConnectionInfo.RemoteEndPoint);
#endif
}
#if !WINDOWS_PHONE
//NAT traversal does not work in .net 2.0
//Mono does not seem to have implemented AllowNatTraversal method and attempting the below method call will throw an exception
//if (Type.GetType("Mono.Runtime") == null)
//Allow NAT traversal by default for all udp clients
// udpClientThreadSafe.AllowNatTraversal(true);
if (listenForIncomingPackets)
{
StartIncomingDataListen();
}
#endif
}
else
{
if (!existingConnection.ConnectionInfo.RemoteEndPoint.Address.Equals(IPAddress.Any))
{
throw new Exception("If an existing udpClient is provided it must be unbound to a specific remoteEndPoint");
}
#if WINDOWS_PHONE
//Using an exiting client allows us to send from the same port as for the provided existing connection
this.socket = existingConnection.socket;
#else
//Using an exiting client allows us to send from the same port as for the provided existing connection
this.udpClientThreadSafe = existingConnection.udpClientThreadSafe;
#endif
}
IPEndPoint localEndPoint;
#if WINDOWS_PHONE
localEndPoint = new IPEndPoint(IPAddress.Parse(socket.Information.LocalAddress.DisplayName.ToString()), int.Parse(socket.Information.LocalPort));
#else
localEndPoint = udpClientThreadSafe.LocalEndPoint;
#endif
//We can update the localEndPoint so that it is correct
if (ConnectionInfo.LocalEndPoint == null || ConnectionInfo.LocalEndPoint.Port == 0)
{
ConnectionInfo.UpdateLocalEndPointInfo(localEndPoint);
}
}
/// <summary>
/// Establish the connection
/// </summary>
protected override void EstablishConnectionSpecific()
{
#if WINDOWS_PHONE
if (socket == null)
{
ConnectSocket();
}
//For the local endpoint
var localEndPoint = new IPEndPoint(IPAddress.Parse(socket.Information.LocalAddress.CanonicalName.ToString()), int.Parse(socket.Information.LocalPort));
//We should now be able to set the connectionInfo localEndPoint
ConnectionInfo.UpdateLocalEndPointInfo(localEndPoint);
//Set the outgoing buffer size
socket.Control.OutboundBufferSizeInBytes = (uint)NetworkComms.SendBufferSizeBytes;
#else
if (tcpClient == null)
{
ConnectSocket();
}
//We should now be able to set the connectionInfo localEndPoint
ConnectionInfo.UpdateLocalEndPointInfo((IPEndPoint)tcpClient.Client.LocalEndPoint);
//We are going to be using the networkStream quite a bit so we pull out a reference once here
tcpClientNetworkStream = tcpClient.GetStream();
//When we tell the socket/client to close we want it to do so immediately
//this.tcpClient.LingerState = new LingerOption(false, 0);
//We need to set the keep alive option otherwise the connection will just die at some random time should we not be using it
//NOTE: This did not seem to work reliably so was replaced with the keepAlive packet feature
//this.tcpClient.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
tcpClient.ReceiveBufferSize = NetworkComms.ReceiveBufferSizeBytes;
tcpClient.SendBufferSize = NetworkComms.SendBufferSizeBytes;
//This disables the 'nagle alogrithm'
//http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.nodelay.aspx
//Basically we may want to send lots of small packets (<200 bytes) and sometimes those are time critical (e.g. when establishing a connection)
//If we leave this enabled small packets may never be sent until a suitable send buffer length threshold is passed. i.e. BAD
tcpClient.NoDelay = true;
tcpClient.Client.NoDelay = true;
#endif
//Start listening for incoming data
StartIncomingDataListen();
//Get a list of existing listeners
List <IPEndPoint> existingListeners = TCPConnection.ExistingLocalListenEndPoints(ConnectionInfo.LocalEndPoint.Address);
//Select a listener for this connection
IPEndPoint selectedExistingListener = null;
if (existingListeners.Count > 0)
{
selectedExistingListener = (existingListeners.Contains(ConnectionInfo.LocalEndPoint) ? ConnectionInfo.LocalEndPoint : existingListeners[0]);
}
//If we are server side and we have just received an incoming connection we need to return a conneciton id
//This id will be used in all future connections from this machine
if (ConnectionInfo.ServerSide)
{
if (selectedExistingListener == null)
{
throw new ConnectionSetupException("Detected a server side connection when an existing listener was not present.");
}
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Waiting for client connnectionInfo from " + ConnectionInfo);
}
//Wait for the client to send its identification
if (!connectionSetupWait.WaitOne(NetworkComms.ConnectionEstablishTimeoutMS))
{
throw new ConnectionSetupException("Timeout waiting for client connectionInfo with " + ConnectionInfo + ". Connection created at " + ConnectionInfo.ConnectionCreationTime.ToString("HH:mm:ss.fff") + ", its now " + DateTime.Now.ToString("HH:mm:ss.f"));
}
if (connectionSetupException)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Connection setup exception. ServerSide with " + ConnectionInfo + ", " + connectionSetupExceptionStr);
}
throw new ConnectionSetupException("ServerSide. " + connectionSetupExceptionStr);
}
//Trigger the connection establish delegates before replying to the connection establish
base.EstablishConnectionSpecific();
//Once we have the clients id we send our own
SendObject(Enum.GetName(typeof(ReservedPacketType), ReservedPacketType.ConnectionSetup), new ConnectionInfo(ConnectionType.TCP, NetworkComms.NetworkIdentifier, new IPEndPoint(ConnectionInfo.RemoteEndPoint.Address, selectedExistingListener.Port), true), NetworkComms.InternalFixedSendReceiveOptions);
}
else
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Sending connnectionInfo to " + ConnectionInfo);
}
//As the client we initiated the connection we now forward our local node identifier to the server
//If we are listening we include our local listen port as well
SendObject(Enum.GetName(typeof(ReservedPacketType), ReservedPacketType.ConnectionSetup), new ConnectionInfo(ConnectionType.TCP, NetworkComms.NetworkIdentifier, new IPEndPoint(ConnectionInfo.RemoteEndPoint.Address, (selectedExistingListener != null ? selectedExistingListener.Port : ConnectionInfo.LocalEndPoint.Port)), selectedExistingListener != null), NetworkComms.InternalFixedSendReceiveOptions);
//Wait here for the server end to return its own identifier
if (!connectionSetupWait.WaitOne(NetworkComms.ConnectionEstablishTimeoutMS))
{
throw new ConnectionSetupException("Timeout waiting for server connnectionInfo from " + ConnectionInfo + ". Connection created at " + ConnectionInfo.ConnectionCreationTime.ToString("HH:mm:ss.fff") + ", its now " + DateTime.Now.ToString("HH:mm:ss.f"));
}
//If we are client side we can update the localEndPoint for this connection to reflect what the remote end might see if we are also listening
if (selectedExistingListener != null)
{
ConnectionInfo.UpdateLocalEndPointInfo(selectedExistingListener);
}
if (connectionSetupException)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Connection setup exception. ClientSide with " + ConnectionInfo + ", " + connectionSetupExceptionStr);
}
throw new ConnectionSetupException("ClientSide. " + connectionSetupExceptionStr);
}
//Trigger the connection establish delegates once the server has replied to the connection establish
base.EstablishConnectionSpecific();
}
#if !WINDOWS_PHONE
//Once the connection has been established we may want to re-enable the 'nagle algorithm' used for reducing network congestion (apparently).
//By default we leave the nagle algorithm disabled because we want the quick through put when sending small packets
if (EnableNagleAlgorithmForNewConnections)
{
tcpClient.NoDelay = false;
tcpClient.Client.NoDelay = false;
}
#endif
}
