c# - BeginReceiveFrom 不会从/到其他设备捕获包

Question

我正在尝试在 C# 中进行包嗅探器，并且我想自己编写它，仅使用 C# 方法不依赖于其他作者。我正在使用 BeginReceiveFrom 方法，并且只捕获到 LAN (192.168.0.87) 中的设备和两个地址的包：224.0.0.251:5353、255.255.255.255:57621。当然，在局域网的设备上，我打开了网站以确保有包通过网络。我做错了什么？:-) 每一个帮助表示赞赏！

1. 我更改了防火墙规则以不阻止我的应用程序。
2. 我向我的应用授予管理员权限。
3. 我将方法从 BeginRecive 更改为 BeginReciveFrom。

静态无效嗅探（IPAddress ip）{

        Socket sck = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);
        sck.Bind(new IPEndPoint(ip, 0));
        sck.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, true);
        sck.IOControl(IOControlCode.ReceiveAll, new byte[4] { 1, 0, 0, 0 }, null);

        byte[] buffer = new byte[24];

        Action<IAsyncResult> OnReceive = null;
        EndPoint endPoint = new IPEndPoint(IPAddress.Parse("192.168.0.87"), 0);

        OnReceive = (ar) =>
        {
            String sourceIp = SourceIP(buffer);
            String destinationIp = DestinationIp(buffer);

            if (sourceIp != ip.ToString() && destinationIp != ip.ToString())
            {

                Console.WriteLine( 
                    "{0}\t{1}:{2}\t===>\t{3}:{4}"
                    , buffer.Skip(9).First().ToProtocolString()
                    , SourceIP(buffer)
                    , ((ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, 20))).ToString()
                    , DestinationIp(buffer)
                    , ((ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, 22))).ToString());
            }

            buffer = new byte[24]; //clean out our buffer

            //sck.BeginReceive(buffer, 0, 24, SocketFlags.None, new AsyncCallback(OnReceive), null);
            sck.BeginReceiveFrom(buffer, 0, 24, SocketFlags.None, ref endPoint, new AsyncCallback(OnReceive), null); 
        };


        // sck.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, new AsyncCallback(OnReceive), null);
        sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref endPoint, new AsyncCallback(OnReceive), null);
    }

    private static String SourceIP(byte[] buffer)
    {
        return new IPAddress(BitConverter.ToUInt32(buffer, 12)).ToString();
    }

    private static String DestinationIp(byte[] buffer)
    {
        return new IPAddress(BitConverter.ToUInt32(buffer, 16)).ToString();
    }


    public static string ToProtocolString(this byte b)
    {
        switch (b)
        {
            case 1: return "ICMP";
            case 6: return "TCP";
            case 17: return "UDP";
            default: return "#" + b.ToString();
        }
    }

我只看到来自/到地址 224.0.0.251:5353、255.255.255.255:57621 的几个包。我希望看到 LAN 中设备之间的整个通信。

标签： c#socketspacket-sniffers