从UDP连接C＃获取客户端的IP [英] Getting client ip from UDP connection C#

问题描述

我现在有一个UDP包在端口上侦听服务器应用程序。当一个被发送到服务器，它接收它正确并处理它。有什么办法，我可以得到的数据包来自何处的IP地址？

下面是我如何创建套接字

  this.UDPListener =新的Socket（AddressFamily.InterNetwork，SocketType.Dgram，ProtocolType.Udp）; 
 
 IPEndPoint端点=新IPEndPoint（IPAddress.Any，端口）; 
 this.UDPListener.Bind（终点）; 
 
的SocketAsyncEventArgs socketEventArgs =新的SocketAsyncEventArgs（）; 
 socketEventArgs.SetBuffer（this.ReceiveBuffer，0，this.ReceiveBuffer.Length）; 
 socketEventArgs.Completed + =新的EventHandler<&的SocketAsyncEventArgs GT;（的onReceive）; 
如果（this.UDPListener.ReceiveAsync（socketEventArgs）！）
 ThreadPool.QueueUserWorkItem（新WaitCallback（（对象o）=> this.OnReceive（这一点，socketEventArgs）））; 
  

当的onReceive被称为没有什么，其中含有消息来自这个ip。我haved通过的SocketAsyncEventArgs看去，我看到的是监听的IP

编辑：

下面是什么我终于实现了。

  this.UDPListener =新的Socket（AddressFamily.InterNetwork，SocketType.Dgram，ProtocolType.Udp）; 
 this.UDPListener.Bind（新IPEndPoint（IPAddress.Any，端口））; 
 
端点remoteEndPoint =新IPEndPoint（IPAddress.Any，0）; 
 this.UDPListener.BeginReceiveFrom（ReceiveBuffer，0，ReceiveBuffer.Length，SocketFlags.None，裁判remoteEndPoint，的onReceive，this.UDPListener）; 
  

然后在的onReceive继承人如何获得的数据和信息

  //获取收到的消息。 
插槽receiveSocket =（插座）AsyncResult.AsyncState; 
端点clientEndPoint =新IPEndPoint（IPAddress.Any，0）; 
 INT udpMessageLength = receiveSocket.EndReceiveFrom（AsyncResult，楼盘clientEndPoint）; 
字节[] = udpMessage新的字节[udpMessageLength] 
 Array.Copy（ReceiveBuffer，udpMessage，udpMessageLength）; 
 
 //开始监听新的消息。 
端点remoteEndPoint =新IPEndPoint（IPAddress.Any，Int32.Parse（（（IPEndPoint）receiveSocket.LocalEndPoint）.Port.ToString（）））; 
 this.UDPListener.BeginReceiveFrom（ReceiveBuffer，0，ReceiveBuffer.Length，SocketFlags.None，裁判remoteEndPoint，的onReceive，this.UDPListener）; 
 
 //处理接收到的消息
的Debug.WriteLine（收到{0}从字节{1}：{2}到{3} {4}，udpMessageLength，（（ IPEndPoint）clientEndPoint）。地址，（（IPEndPoint）clientEndPoint）.Port，（（IPEndPoint）receiveSocket.LocalEndPoint）。地址，（（IPEndPoint）receiveSocket.LocalEndPoint）.Port）; 
  

解决方案

我不知道 UdpClient ，但如果你直接使用插座类，你可以调用 .ReceiveFrom（字节[]，参考端点）方法，并接收通过第二个参数的远程地址。

I currently have a server application that is listening on a port for UDP packets. When one is sent to the server, it receives it properly and processes it. Is there any way I can get the ip address of where the packet came from?

Here is how I create the socket

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)));

When the OnReceive is called there is nothing that contains the ip where the message came from. I haved looked through the SocketAsyncEventArgs and all I see is the listening ip.

Edit:

Here is what I ended up doing.

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);

Then in the OnReceive heres how to get the data and info

//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);

解决方案

I don't know about UdpClient, but if you use the Socket class directly, you can call the .ReceiveFrom(byte[], ref EndPoint) method, and receive the remote address via the second argument.

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