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我需要通过在服务器本身上运行的程序或最好通过在其中一个 DHCP 客户端上运行的程序来获取 MAC 到存储在 DHCP 服务器上的 IP 的映射。

我了解netsh 实用程序可用于获取转储，但我并没有取得太大的成功。

有任何工作示例或提示吗？

我拥有 DHCP 服务器的管理员权限

编辑

我不想使用 arp 缓存，因为这需要我广播 ping（这在 Windows 上是不允许的）或 ping 子网的所有可能 IP 地址（这需要很多时间）。

我确定 DHCP 服务器存储 MAC 到 IP 的映射，我如何使用该信息将 MAC 映射到 IP 地址？

4

3 回答 3

4

为此，您可以使用Windows 2000 资源工具包中的DHCP 对象组件。尽管该组件很难找到，它是为 Windows 2000 设计的，根据 Microsoft 的说法，它在 2010 年 7 月停止了生命支持，并且文档很少，但它确实可以工作。

  1. 如果您在 Microsoft 中找不到名为DHCP 对象的资源工具包工具，请从此处下载。这将为您提供一个 .exe 文件，该文件将安装 DHCP 对象组件。
  2. 注册该DHCPOBJS.DLL文件regsvr32 或为其创建一个 COM+ 应用程序。哪个适用取决于 COM 组件将如何在您的系统上使用。
  3. 使用类型库导入tlbimp.exe器创建一个托管包装器，DHCPOBJS.DLL因为它已被系统注册。
  4. 在 Visual Studio 中，添加对托管包装器的引用。它的默认生成名称是DhcpObjects.dll.

现在您可以针对组件编写如下代码：

using DhcpObjects;
class Program {
    static void Main(string[] args) {
        var manager = new Manager();
        var server = dhcpmgr.Servers.Connect("1.2.3.4");
        // query server here
    }
}

安装程序还提供了一个 Windows 帮助文件，其中包含有关如何查询和操作 DHCP 服务器的更多文档。“对象模型”部分很有帮助。

于 2010-02-11T08:29:16.283 回答
2 
using System;
using System.Runtime.InteropServices;
using System.Collections;
using System.Net;

namespace dhcp
{
// c# class for processed clients

public class dhcpClient
{
    public string hostname { get; set; }
    public string ip       { get; set; }
    public string mac      { get; set; }
}

// structs for use with call to unmanaged code

[StructLayout(LayoutKind.Sequential)]
public struct DHCP_CLIENT_INFO_ARRAY
{
    public uint NumElements;
    public IntPtr Clients;
}

[StructLayout(LayoutKind.Sequential)]
public struct DHCP_CLIENT_UID
{
    public uint DataLength;
    public IntPtr Data;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct DHCP_CLIENT_INFO
{
    public uint ip;
    public uint subnet;

    public DHCP_CLIENT_UID mac;

    [MarshalAs(UnmanagedType.LPWStr)]
    public string ClientName;

    [MarshalAs(UnmanagedType.LPWStr)]
    public string ClientComment;
}

// main

class Program
{
    static void Main()
    {
        try
        {
            // get settings

            String server, subnet;

            Console.Write("Enter server : ");
            server = Console.ReadLine();
            Console.Write("Enter subnet : ");
            subnet = Console.ReadLine();

            // gather clients

            ArrayList clients = findDhcpClients(server, subnet);

            // output results

            Console.WriteLine();

            foreach (dhcpClient d in clients)
                Console.WriteLine(String.Format("{0,-35} {1,-15} {2,-15}", d.hostname, d.ip, d.mac));

            Console.WriteLine('\n' + clients.Count.ToString() + " lease(s) in total");
        }

        catch (Exception e)
        {
            Console.WriteLine(e.ToString());
        }

        Console.ReadLine();
    }

    static ArrayList findDhcpClients(string server, string subnet)
    {
        // set up container for processed clients

        ArrayList foundClients = new ArrayList();

        // make call to unmanaged code

        uint parsedMask     = StringIPAddressToUInt32(subnet);
        uint resumeHandle   = 0;
        uint numClientsRead = 0;
        uint totalClients   = 0;

        IntPtr info_array_ptr;

        uint response = DhcpEnumSubnetClients(
            server,
            parsedMask,
            ref resumeHandle,
            65536,
            out info_array_ptr,
            ref numClientsRead,
            ref totalClients
            );

        // set up client array casted to a DHCP_CLIENT_INFO_ARRAY
        // using the pointer from the response object above

        DHCP_CLIENT_INFO_ARRAY rawClients =
            (DHCP_CLIENT_INFO_ARRAY)Marshal.PtrToStructure(info_array_ptr, typeof(DHCP_CLIENT_INFO_ARRAY));

        // loop through the clients structure inside rawClients 
        // adding to the dchpClient collection

        IntPtr current = rawClients.Clients;

        for (int i = 0; i < (int)rawClients.NumElements; i++)
        {
            // 1. Create machine object using the struct

            DHCP_CLIENT_INFO rawMachine =
                (DHCP_CLIENT_INFO)Marshal.PtrToStructure(Marshal.ReadIntPtr(current), typeof(DHCP_CLIENT_INFO));

            // 2. create new C# dhcpClient object and add to the 
            // collection (for hassle-free use elsewhere!!)

            dhcpClient thisClient = new dhcpClient();

            thisClient.ip = UInt32IPAddressToString(rawMachine.ip);

            thisClient.hostname = rawMachine.ClientName;

            thisClient.mac = String.Format("{0:x2}{1:x2}.{2:x2}{3:x2}.{4:x2}{5:x2}",
                Marshal.ReadByte(rawMachine.mac.Data),
                Marshal.ReadByte(rawMachine.mac.Data, 1),
                Marshal.ReadByte(rawMachine.mac.Data, 2),
                Marshal.ReadByte(rawMachine.mac.Data, 3),
                Marshal.ReadByte(rawMachine.mac.Data, 4),
                Marshal.ReadByte(rawMachine.mac.Data, 5));

            foundClients.Add(thisClient);

            // 3. move pointer to next machine

            current = (IntPtr)((int)current + (int)Marshal.SizeOf(typeof(IntPtr)));
        }

        return foundClients;
    }

    public static uint StringIPAddressToUInt32(string ip)
    {
        // convert string IP to uint IP e.g. "1.2.3.4" -> 16909060

        IPAddress i = System.Net.IPAddress.Parse(ip);
        byte[] ipByteArray = i.GetAddressBytes();

        uint ipUint = (uint)ipByteArray[0] << 24;
        ipUint += (uint)ipByteArray[1] << 16;
        ipUint += (uint)ipByteArray[2] << 8;
        ipUint += (uint)ipByteArray[3];

        return ipUint;
    }

    public static string UInt32IPAddressToString(uint ip)
    {
        // convert uint IP to string IP e.g. 16909060 -> "1.2.3.4"

        IPAddress i = new IPAddress(ip);
        string[] ipArray = i.ToString().Split('.');

        return ipArray[3] + "." + ipArray[2] + "." + ipArray[1] + "." + ipArray[0];
    }

    [DllImport("dhcpsapi.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern uint DhcpEnumSubnetClients(
            string ServerIpAddress,
            uint SubnetAddress,
        ref uint ResumeHandle,
            uint PreferredMaximum,
        out IntPtr ClientInfo,
        ref uint ElementsRead,
        ref uint ElementsTotal
    );
}
}
于 2010-10-13T10:38:12.010 回答
0

会使用arp -a做伎俩......在我的机器上，我得到的输出是：

我将 mac/ip 地址替换为虚假值以显示结果...

C:\Documents and Settings\Tom>arp -a

接口：10.203.24.196 --- 0xf0007
  互联网地址物理地址类型
  10.203.24.198 02-50-f3-10-14-06 动态

C:\文档和设置\汤姆>

通过使用System.Diagnostics.Process，您可以将输出重定向到输入流并从中读取...

希望这会有所帮助，最好的问候，汤姆。

于 2010-02-08T21:36:39.327 回答