c# - 如何在 C# 中从 IP 获取机器的 NetBIOS 名称？

Question

给定机器的 IP 地址，我如何在 C# 中以编程方式获取其 NetBIOS 名称？我知道我可以通过“nbtstat -A”从命令行获取它，但我正在寻找更好的解决方案。

Answer 1

选中使用 Socket 类通过 UDP 请求设备的 NetBios 名称 （向下滚动）。

编辑

由于原始页面上的 404，社区已编辑 URL，并将链接更改为从中提取web.archive.org

Answer 2

您可以将 winapi gethostbyaddr与 type 一起使用AF_NETBIOS。

Answer 3

你使用这个代码，它基于我在微软找到的一个例子。当它在端口 137 获得 UDP 请求的结果时，它会从答案中删除名称。它不检查名称是否为有效的 NetBIOS 名称。可以添加它以使其更安全。

public class NetBIOSHelper
{
    /// <summary>
    /// Get the NetBIOS machine name and domain / workgroup name by ip address using UPD datagram at port 137. Based on code I found at microsoft 
    /// </summary>
    /// <returns>True if getting an answer on port 137 with a result</returns>
    public static bool GetRemoteNetBiosName(IPAddress targetAddress, out string nbName, out string nbDomainOrWorkgroupName, int receiveTimeOut = 5000, int retries = 1)
    {
        // The following byte stream contains the necessary message
        // to request a NetBios name from a machine
        byte[] nameRequest = new byte[]{
        0x80, 0x94, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x20, 0x43, 0x4b, 0x41,
        0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
        0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
        0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
        0x41, 0x41, 0x41, 0x41, 0x41, 0x00, 0x00, 0x21,
        0x00, 0x01 };

        do
        {
            byte[] receiveBuffer = new byte[1024];
            Socket requestSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            requestSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, receiveTimeOut);

            nbName = null;
            nbDomainOrWorkgroupName = null;

            EndPoint remoteEndpoint = new IPEndPoint(targetAddress, 137);
            IPEndPoint originEndpoint = new IPEndPoint(IPAddress.Any, 0);
            requestSocket.Bind(originEndpoint);
            requestSocket.SendTo(nameRequest, remoteEndpoint);
            try
            {
                int receivedByteCount = requestSocket.ReceiveFrom(receiveBuffer, ref remoteEndpoint);

                // Is the answer long enough?
                if (receivedByteCount >= 90)
                {
                    Encoding enc = new ASCIIEncoding();
                    nbName = enc.GetString(receiveBuffer, 57, 15).Trim();
                    nbDomainOrWorkgroupName = enc.GetString(receiveBuffer, 75, 15).Trim();

                    // the names may be checked if they are really valid NetBIOS names, but I don't care ....

                    return true;
                    //<----------
                }
            }
            catch (SocketException)
            {
                // We get this Exception when the target is not reachable
            }

            retries--;

        } while (retries >= 0);

        return false;
        //< ----------
    }
}