在 C# 中查询 DHCP 服务器
题
我需要通过在服务器本身上运行的程序或者最好通过在其中一个 DHCP 客户端上运行的程序来获取存储在 DHCP 服务器上的 MAC 到 IP 的映射。
我明白 netsh实用程序 可以用来获取转储,但我在这方面还没有取得太大成功。
有什么可行的例子或提示吗?
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(Windows 上不允许)或 ping 子网的所有可能的 ip 地址(这需要大量时间)。
我确信 DHCP 服务器存储了 MAC 到 IP 地址的映射,我如何使用该信息将 MAC 映射到 IP 地址?
没有正确的解决方案
其他提示
您可以使用 DHCP 对象组件 来自 Windows 2000 资源工具包 为了这。尽管该组件很难找到,而且是为 Windows 2000 开发的,据 Microsoft 称已于 2010 年 7 月停止支持,并且文档很少,但它确实可以工作。
- 下载名为的资源工具包工具 DHCP 对象 例如来自 这里 如果你在微软找不到它。这将为您提供一个 .exe 文件,该文件将安装 DHCP 对象组件。
- 注册
DHCPOBJS.DLL
文件与regsvr32
或者 为其创建一个 COM+ 应用程序。哪一种适用取决于 COM 组件将如何在您的系统上使用。 - 使用类型库导入器
tlbimp.exe
创建一个托管包装器DHCPOBJS.DLL
现在它已经被系统注册了。 - 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”部分非常有帮助。
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
);
}
}
请问使用arp -a
做的伎俩......我的机器上输出我得到的是:
我具有由假值替换MAC / IP地址,以显示结果...
C:\Documents and Settings\Tom>arp -a Interface: 10.203.24.196 --- 0xf0007 Internet Address Physical Address Type 10.203.24.198 02-50-f3-10-14-06 dynamic C:\Documents and Settings\Tom>
通过炮击了使用System.Diagnostics.Process
,可以将输出重定向到的输入流,并从它读取...
希望这有助于 最好的祝福, 汤姆。
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