Threaded ARP pinging

Question

我正在开发C＃代码，该代码pings pings pings pings pings pings pings pings ping ping（从1-255起）带有ARP请求（有趣的是有多少设备对ARP请求响应，但没有ping）。>

使用ping我可以设置超时并运行异步，并且需要一秒钟才能扫描子网。我不确定如何使用ARP执行此操作，因为我无法设置超时值。我可以在线程中发送请求吗？我在多线程方面几乎没有经验，但是欢迎任何帮助。

[DllImport("iphlpapi.dll", ExactSpelling = true)]
public static extern int SendARP(int DestIP, int SrcIP, byte[] pMacAddr, ref uint, PhyAddrLen);

...

if (SendARP(intAddress, 0, macAddr, ref macAddrLen) == 0)
{
// Host found! Woohoo
}

Answer 1

这应该做到。自然，控制台输出可能不会订购。

class Program
{
    [DllImport("iphlpapi.dll", ExactSpelling = true)]
    public static extern int SendARP(int DestIP, int SrcIP, byte[] pMacAddr, ref uint PhyAddrLen);
    static void Main(string[] args)
    {
        List<IPAddress> ipAddressList = new List<IPAddress>();
        //Generating 192.168.0.1/24 IP Range
        for (int i = 1; i < 255; i++)
        {
            //Obviously you'll want to safely parse user input to catch exceptions.
            ipAddressList.Add(IPAddress.Parse("192.168.0." + i));
        }
        foreach (IPAddress ip in ipAddressList)
        {
            Thread thread = new Thread(() => SendArpRequest(ip));
            thread.Start();
        }
    }
    static void SendArpRequest(IPAddress dst)
    {
        byte[] macAddr = new byte[6];
        uint macAddrLen = (uint)macAddr.Length;
        int uintAddress = BitConverter.ToInt32(dst.GetAddressBytes(), 0);
        if (SendARP(uintAddress, 0, macAddr, ref macAddrLen) == 0)
        {
            Console.WriteLine("{0} responded to ping", dst.ToString());
        }
    }
}