通过C#中的TCPListener获取MAC地址 [英] Get MAC address via TCPListener in C#

问题描述

是否可以通过C#中的TCPListener获取远程客户端的MAC地址?

Is it possible to get MAC Address of remote client via TCPListener in C#?

using System;  
using System.Net;  
using System.Net.Sockets;  
using System.IO;  
using System.Text;  

namespace TCPserver  
{  
    class Program  
    {  
        private const int BUFSIZE = 32;  

        static void Main(string[] args)  
        {  
            if (args.Length > 1) // Test for correct of args  
                throw new ArgumentException("Parameters: [<Port>]");  

            int servPort = (args.Length == 1) ? Int32.Parse(args[0]) : 7;  

            TcpListener listener = null;  

            try  
            {  
                // Create a TCPListener to accept client connections  
                listener = new TcpListener(IPAddress.Any, servPort);  
                listener.Start();  
            }  
            catch (SocketException se)  
            {  
                Console.WriteLine(se.Message);  
                Environment.Exit(se.ErrorCode);  
            }  

            byte[] rcvBuffer = new byte[BUFSIZE]; // Receive buffer  
            int bytesRcvd; // Received byte count  

            for (; ; )  
            { // Run forever, accepting and servicing connections  

                TcpClient client = null;  
                NetworkStream ns = null;  
                try  
                {  
                    client = listener.AcceptTcpClient(); // Get client connection  
                    ns = client.GetStream();  
                    Console.Write("Handling client - ");  

                    // Receive until client closes connection  
                    int totalBytesEchoed = 0;  
                    while ((bytesRcvd = ns.Read(rcvBuffer, 0, rcvBuffer.Length)) > 0)  
                    {  
                        ns.Write(rcvBuffer, 0, bytesRcvd);  
                        totalBytesEchoed += bytesRcvd;  
                    }  
                    Console.WriteLine("echoed {0} bytes.", totalBytesEchoed);  

                    ns.Close();  
                    client.Close();  

                }  
                catch (Exception e)  
                {  
                    Console.WriteLine(e.Message);  
                    ns.Close();  
                }  
            }  
        }  
    }  
}  

推荐答案

否.MAC地址是链接层的一部分，仅用于通信同一主机中的两个主机物理链接.

No. The MAC address is part of the Link layer, only used to communicate two hosts in the same physical link.

过度简化...，假设 a 和 c 是计算机，而 b 是路由器.

Oversimplifying..., imagine that a and c are computers, and b is a router.

a <-> b <-> c

如果 a 要发送数据包到 c ，则必须通过 b .因此， a 发送的数据包的源IP地址为 a ，目标IP地址为 c ，源MAC地址为 a 地址 b ，因为路由器是下一跳.然后，当 b 收到该数据包时，它将使用源IP地址 a ，目标IP地址 c c >，源MAC地址 b 和目标MAC地址 c .

If a wants to send a packet to c, it has to go through b. So a sends packet with source IP address a, target IP address c, source MAC address a and target MAC address b, since the router is the next hop. Then when b gets that packet, it will send it to c using source IP address a, target IP address c, source MAC address b and target MAC address c.

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