從UDP連接C＃獲取客戶端IP

Question

我目前有一個服務器應用程序正在偵聽UDP數據包的端口。 當一個發送到服務器時，它會正確接收並處理它。 有什么方法可以獲得數據包來自哪里的IP地址？

這是我創建套接字的方法

this.UDPListener = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, Port);
this.UDPListener.Bind(endPoint);

SocketAsyncEventArgs socketEventArgs = new SocketAsyncEventArgs(); 
socketEventArgs.SetBuffer(this.ReceiveBuffer, 0, this.ReceiveBuffer.Length);
socketEventArgs.Completed += new EventHandler<SocketAsyncEventArgs>(OnReceive);
if (!this.UDPListener.ReceiveAsync(socketEventArgs))
    ThreadPool.QueueUserWorkItem(new WaitCallback((Object o) => this.OnReceive(this, socketEventArgs)));

當調用OnReceive時，沒有任何內容包含消息來自的ip。 我已經查看了SocketAsyncEventArgs，我看到的只是監聽ip。

編輯：

這就是我最終做的事情。

this.UDPListener = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
this.UDPListener.Bind(new IPEndPoint(IPAddress.Any, Port));

EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, 0);
this.UDPListener.BeginReceiveFrom(ReceiveBuffer, 0, ReceiveBuffer.Length, SocketFlags.None, ref remoteEndPoint, OnReceive, this.UDPListener);

然后在OnReceive繼承人如何獲取數據和信息

//Get the received message.
Socket receiveSocket = (Socket)AsyncResult.AsyncState;
EndPoint clientEndPoint = new IPEndPoint(IPAddress.Any, 0);
int udpMessageLength = receiveSocket.EndReceiveFrom(AsyncResult, ref clientEndPoint);
byte[] udpMessage = new byte[udpMessageLength];
Array.Copy(ReceiveBuffer, udpMessage, udpMessageLength);

//Start listening for a new message.
EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, Int32.Parse(((IPEndPoint)receiveSocket.LocalEndPoint).Port.ToString()));
this.UDPListener.BeginReceiveFrom(ReceiveBuffer, 0, ReceiveBuffer.Length, SocketFlags.None, ref remoteEndPoint, OnReceive, this.UDPListener);

//Handle the received message
Debug.WriteLine("Recieved {0} bytes from {1}:{2} to {3}:{4}", udpMessageLength, ((IPEndPoint)clientEndPoint).Address, ((IPEndPoint)clientEndPoint).Port, ((IPEndPoint)receiveSocket.LocalEndPoint).Address, ((IPEndPoint)receiveSocket.LocalEndPoint).Port);

Answer 1

我不知道UdpClient ，但是如果你直接使用Socket類，你可以調用.ReceiveFrom(byte[], ref EndPoint)方法，並通過第二個參數接收遠程地址。

Answer 2

您需要檢查參數中的ReceiveMessageFromPacketInfo字段。

    void OnReceive(object sender, SocketAsyncEventArgs e)
    {
        var info = e.ReceiveMessageFromPacketInfo;
        byte[] address = info.Address.GetAddressBytes();
    }

Answer 3

據http://msdn.microsoft.com/en-us/library/system.net.sockets.socketasynceventargs.remoteendpoint.aspx該SocketAsyncEventArgs包含包含另一端的RemoteEndPoint屬性。 那里有什么嗎？