如何监听任何端口上的广播包？ [英] How to listen for broadcast packets on any port?

问题描述

使用.NET，我怎么能听不绑定到特定端口需要发送到.255任何端口的UDP广播包？

Using .NET, how can I listen to udp broadcast packets sent to .255 on any port without the need of binding to a specific port?

推荐答案

我找到了一种方法自己。这是如何工作的：

I found a way myself. This is how it works:

mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);
mainSocket.Bind(new IPEndPoint(IPAddress.Parse("192.168.0.1"), 0));
mainSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, true);                           

byte[] byTrue = new byte[4] { 1, 0, 0, 0 };
byte[] byOut = new byte[4] { 1, 0, 0, 0 }; 

// Socket.IOControl is analogous to the WSAIoctl method of Winsock 2
mainSocket.IOControl(IOControlCode.ReceiveAll, //Equivalent to SIO_RCVALL constant of Winsock 2
    byTrue,
    byOut);

//Start receiving the packets asynchronously
mainSocket.BeginReceive(byteData,0,byteData.Length,SocketFlags.None,new AsyncCallback(OnReceive),null);

在异步处理程序中，我做了mainSocket.EndReceive（...），分析数据，并开始一个新的BeginReceive如果想（从多线程的接收器外控制）。

In the async handler, I do a mainSocket.EndReceive(...), parse the data and start a new BeginReceive if wanted (controlled from outside the multithreaded receiver).

工程就像一个魅力。积分去亚太区首席技术官Matt夏尔马（<一href="http://www.$c$cproject.com/KB/IP/CSNetworkSniffer.aspx">http://www.$c$cproject.com/KB/IP/CSNetworkSniffer.aspx)

Works like a charm. Credits go to Hitesh Sharma (http://www.codeproject.com/KB/IP/CSNetworkSniffer.aspx)

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