blocks|key|3595983|text|在dhcp服务器上只有本机win32+api。所以你得把它敲一下。这是DHCP服务器管理APIDHCP服务器管理API。在这里你可以找到使用本api部分的示例。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/aa363376(VS.85).aspx)|1|2|http://www.pinvoke.net/default.aspx/dhcpsapi/DhcpEnumSubnetClients.html^0|Z|C|0|1B|C|1|1W|B|2^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]|$A|U|B|V|1|W]]|C|$]]]|D|$E|$5|F|G|H|C|$I|J]]|K|$5|F|G|H|C|$I|J]]|L|$5|F|G|H|C|$I|M]]]]

There is only native win32 api to the dhcp server. So you will have to pinvoke it. Here is the <a href="http://msdn.microsoft.com/en-us/library/aa363376(VS.85).aspx" rel="nofollow noreferrer">DHCP Server Management API</a>. Here you can find <a href="http://www.pinvoke.net/default.aspx/dhcpsapi/DhcpEnumSubnetClients.html" rel="nofollow noreferrer">samples of using part of this api</a>.

blocks|key|5895261|text|使用SSH连接到服务器，并请求并解析/var/lib/dhcpd/dhcpd.leases。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|entityMap|0|LINK|mutability|MUTABLE|url|http://www.routrek.co.jp/en/product/varaterm/granados.html|1|http://linux.die.net/man/5/dhcpd.leases^0|I|R|2|3|0|I|R|1^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@$9|R|A|S|1|T]|$9|U|A|V|1|W]]|E|$]]]|F|$G|$5|H|I|J|E|$K|L]]|M|$5|H|I|J|E|$K|N]]]]

Connect to the server using <a href="http://www.routrek.co.jp/en/product/varaterm/granados.html" rel="nofollow noreferrer">SSH</a> and ask for and parse <a href="http://linux.die.net/man/5/dhcpd.leases" rel="nofollow noreferrer"><code>/var/lib/dhcpd/dhcpd.leases</code></a>.

blocks|key|5895273|text|可以使用SNMP监视Microsoft的DHCP服务器。咨询DHCP，看看它是否包含您所寻求的信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

Microsoft's DHCP servers can be monitored using SNMP. Consult the MS DHCP MIB to see if it includes the information you seek.

blocks|key|3595881|text|你必须能够发出的ARP请求是肯定的。您可以做的是ARP所有的in在您的网络中一个一个，看看谁回答。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

You must be able to send out ARP requests for sure. What you can do is ARP all the IPs in your network one by one and see who answers.

blocks|key|5895472|text|//http://www.apachejava.blogspot.com


using+System;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5895473|using+System.Collections.Generic;+using+System.Text;+using+System.Runtime.InteropServices;+using+System.ComponentModel;+using+System.Xml;+using+System.Net;|unstyled|offset|length|style|CODE|5895474|namespace+DHCPTry+{|5895475|public+struct+CUSTOM_CLIENT_INFO
{
++++public+string+ClientName;
++++public+string+IpAddress;
++++public+string+MacAddress;
}

[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)]
public+struct+DATE_TIME
{
++++public+uint+dwLowDateTime;
++++public+uint+dwHighDateTime;

++++public+DateTime+Convert()
++++{
++++++++if+(dwHighDateTime+==+0+&&+dwLowDateTime+==+0)
++++++++{
++++++++++++return+DateTime.MinValue;
++++++++}
++++++++if+(dwHighDateTime+==+int.MaxValue+&&+dwLowDateTime+==+UInt32.MaxValue)
++++++++{
++++++++++++return+DateTime.MaxValue;
++++++++}
++++++++return+DateTime.FromFileTime((((long)dwHighDateTime)+<<+32)+%7C+(UInt32)dwLowDateTime);
++++}
}

[StructLayout(LayoutKind.Sequential,+CharSet+=+CharSet.Auto)]
public+struct+DHCP_HOST_INFO
{
++++public+uint+IpAddress;
++++public+string+NetBiosName;
++++public+string+HostName;
}

[StructLayout(LayoutKind.Sequential,+CharSet+=+CharSet.Auto)]
public+struct+DHCP_CLIENT_INFO
{
++++public+uint+ClientIpAddress;
++++public+uint+SubnetMask;
++++public+DHCP_CLIENT_UID+ClientHardwareAddress;+//no+pointer+->+structure+!!
++++[MarshalAs(UnmanagedType.LPWStr)]
++++public+string+ClientName;
++++[MarshalAs(UnmanagedType.LPWStr)]
++++public+string+ClientComment;
++++public+DATE_TIME+ClientLeaseExpires;+//no+pointer+->+structure+!!
++++public+DHCP_HOST_INFO+OwnerHost;+//no+pointer+->+structure
}

class+Program
{
++++[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
++++);

++++static+void+Main()
++++{
++++++++try
++++++++{
++++++++++++enum_clients("192.168.3.1",+"192.168.3.0");
++++++++}
++++++++catch+(Exception+ex)
++++++++{
++++++++++++Console.WriteLine(ex.Message);
++++++++}
++++++++Console.ReadLine();
++++}

++++static+void+enum_clients(string+Server,+string+Subnet)
++++{
++++++++string+ServerIpAddress+=+Server;
++++++++uint+Response+=+0;
++++++++uint+SubnetMask+=+StringIPAddressToUInt32(Subnet);
++++++++IntPtr+info_array_ptr;
++++++++uint+ResumeHandle+=+0;
++++++++uint+nr_clients_read+=+0;
++++++++uint+nr_clients_total+=+0;

++++++++Response+=+DhcpEnumSubnetClients(ServerIpAddress,+SubnetMask,+ref+ResumeHandle,
+++++++++++65536,+out+info_array_ptr,+ref+nr_clients_read,+ref+nr_clients_total);
++++++++DHCP_CLIENT_INFO_ARRAY+clients+=+(DHCP_CLIENT_INFO_ARRAY)Marshal.PtrToStructure(info_array_ptr,+typeof(DHCP_CLIENT_INFO_ARRAY));
++++++++Console.WriteLine("NumElements{0}",clients.NumElements.ToString());
++++++++int+size+=+(int)clients.NumElements;
++++++++IntPtr[]+ptr_array+=+new+IntPtr[size];
++++++++IntPtr+current+=+clients.Clients;
++++++++for+(int+i+=+0;+i+<+size;+i%2B%2B)
++++++++{
++++++++++++Console.WriteLine("{0}",+i);
++++++++++++ptr_array[i]+=+Marshal.ReadIntPtr(current);
++++++++++++current+=+(IntPtr)((int)current+%2B+(int)Marshal.SizeOf(typeof(IntPtr)));
++++++++}
++++++++CUSTOM_CLIENT_INFO[]+clients_array+=+new+CUSTOM_CLIENT_INFO[size];

++++++++for+(int+i+=+0;+i+<+size;+i%2B%2B)
++++++++{
++++++++++++DHCP_CLIENT_INFO+curr_element+=+(DHCP_CLIENT_INFO)Marshal.PtrToStructure(ptr_array[i],+typeof(DHCP_CLIENT_INFO));
++++++++++++clients_array[i].IpAddress+=+UInt32IPAddressToString(curr_element.ClientIpAddress);
++++++++++++clients_array[i].ClientName+=+curr_element.ClientName;
++++++++++++Console.WriteLine("Client+name+{0}",+clients_array[i].ClientName);
++++++++++++clients_array[i].MacAddress+=+String.Format("{0:x2}-{1:x2}-{2:x2}-{3:x2}-{4:x2}-{5:x2}",
++++++++++++++++Marshal.ReadByte(curr_element.ClientHardwareAddress.Data),
++++++++++++++++Marshal.ReadByte(curr_element.ClientHardwareAddress.Data,+1),
++++++++++++++++Marshal.ReadByte(curr_element.ClientHardwareAddress.Data,+2),
++++++++++++++++Marshal.ReadByte(curr_element.ClientHardwareAddress.Data,+3),
++++++++++++++++Marshal.ReadByte(curr_element.ClientHardwareAddress.Data,+4),
++++++++++++++++Marshal.ReadByte(curr_element.ClientHardwareAddress.Data,+5));
++++++++++++Console.WriteLine("Client+MAC+{0}",+UInt32IPAddressToString(curr_element.ClientIpAddress));
++++++++++++//This+section+will+throw+an+AccessViolationException
+++++++++++++//Marshal.DestroyStructure(current,+typeof(DHCP_CLIENT_INFO));
++++++++++++//+current+=+(IntPtr)((int)current+%2B+(int)Marshal.SizeOf(curr_element));
++++++++++++//Replace+with:
++++++++++++//Marshal.DestroyStructure(ptr_array[i],+typeof(DHCP_CLIENT_INFO));
++++++++}
++++++}

++++public+static+uint+StringIPAddressToUInt32(string+ip_string)
++++{
++++++++IPAddress+IpA+=+System.Net.IPAddress.Parse(ip_string);
++++++++byte[]+ip_bytes+=+IpA.GetAddressBytes();
++++++++uint+ip_uint+=+(uint)ip_bytes[0]+<<+24;
++++++++ip_uint+%2B=+(uint)ip_bytes[1]+<<+16;
++++++++ip_uint+%2B=+(uint)ip_bytes[2]+<<+8;
++++++++ip_uint+%2B=+(uint)ip_bytes[3];
++++++++return+ip_uint;
++++}

++++public+static+string+UInt32IPAddressToString(uint+ipAddress)
++++{
++++++++IPAddress+ipA+=+new+IPAddress(ipAddress);
++++++++string[]+sIp+=+ipA.ToString().Split('.');

++++++++return+sIp[3]+%2B+"."+%2B+sIp[2]+%2B+"."+%2B+sIp[1]+%2B+"."+%2B+sIp[0];
++++}



}|5895476|}|entityMap^0|0|0|X|Y|I|1H|11|2J|S|3C|H|3U|H|0|0|J|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|S|8|@$G|T|H|U|I|J]|$G|V|H|W|I|J]|$G|X|H|Y|I|J]|$G|Z|H|10|I|J]|$G|11|H|12|I|J]|$G|13|H|14|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|15|8|@$G|16|H|17|I|J]]|9|@]|A|$]]|$1|M|3|N|5|6|7|18|8|@]|9|@]|A|$B|C]]|$1|O|3|P|5|F|7|19|8|@]|9|@]|A|$]]]|Q|$]]

<pre><code>//http://www.apachejava.blogspot.com


using System;
</code></pre>

<code>using System.Collections.Generic;</code>
<code>using System.Text;</code>
<code>using System.Runtime.InteropServices;</code>
<code>using System.ComponentModel;</code>
<code>using System.Xml;</code>
<code>using System.Net;</code>

<code>namespace DHCPTry
{</code>

<pre><code>public struct CUSTOM_CLIENT_INFO
{
 public string ClientName;
 public string IpAddress;
 public string MacAddress;
}

[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)]
public struct DATE_TIME
{
 public uint dwLowDateTime;
 public uint dwHighDateTime;

 public DateTime Convert()
 {
 if (dwHighDateTime == 0 &amp;&amp; dwLowDateTime == 0)
 {
 return DateTime.MinValue;
 }
 if (dwHighDateTime == int.MaxValue &amp;&amp; dwLowDateTime == UInt32.MaxValue)
 {
 return DateTime.MaxValue;
 }
 return DateTime.FromFileTime((((long)dwHighDateTime) &lt;&lt; 32) | (UInt32)dwLowDateTime);
 }
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct DHCP_HOST_INFO
{
 public uint IpAddress;
 public string NetBiosName;
 public string HostName;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct DHCP_CLIENT_INFO
{
 public uint ClientIpAddress;
 public uint SubnetMask;
 public DHCP_CLIENT_UID ClientHardwareAddress; //no pointer -&gt; structure !!
 [MarshalAs(UnmanagedType.LPWStr)]
 public string ClientName;
 [MarshalAs(UnmanagedType.LPWStr)]
 public string ClientComment;
 public DATE_TIME ClientLeaseExpires; //no pointer -&gt; structure !!
 public DHCP_HOST_INFO OwnerHost; //no pointer -&gt; structure
}

class Program
{
 [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
 );

 static void Main()
 {
 try
 {
 enum_clients("192.168.3.1", "192.168.3.0");
 }
 catch (Exception ex)
 {
 Console.WriteLine(ex.Message);
 }
 Console.ReadLine();
 }

 static void enum_clients(string Server, string Subnet)
 {
 string ServerIpAddress = Server;
 uint Response = 0;
 uint SubnetMask = StringIPAddressToUInt32(Subnet);
 IntPtr info_array_ptr;
 uint ResumeHandle = 0;
 uint nr_clients_read = 0;
 uint nr_clients_total = 0;

 Response = DhcpEnumSubnetClients(ServerIpAddress, SubnetMask, ref ResumeHandle,
 65536, out info_array_ptr, ref nr_clients_read, ref nr_clients_total);
 DHCP_CLIENT_INFO_ARRAY clients = (DHCP_CLIENT_INFO_ARRAY)Marshal.PtrToStructure(info_array_ptr, typeof(DHCP_CLIENT_INFO_ARRAY));
 Console.WriteLine("NumElements{0}",clients.NumElements.ToString());
 int size = (int)clients.NumElements;
 IntPtr[] ptr_array = new IntPtr[size];
 IntPtr current = clients.Clients;
 for (int i = 0; i &lt; size; i++)
 {
 Console.WriteLine("{0}", i);
 ptr_array[i] = Marshal.ReadIntPtr(current);
 current = (IntPtr)((int)current + (int)Marshal.SizeOf(typeof(IntPtr)));
 }
 CUSTOM_CLIENT_INFO[] clients_array = new CUSTOM_CLIENT_INFO[size];

 for (int i = 0; i &lt; size; i++)
 {
 DHCP_CLIENT_INFO curr_element = (DHCP_CLIENT_INFO)Marshal.PtrToStructure(ptr_array[i], typeof(DHCP_CLIENT_INFO));
 clients_array[i].IpAddress = UInt32IPAddressToString(curr_element.ClientIpAddress);
 clients_array[i].ClientName = curr_element.ClientName;
 Console.WriteLine("Client name {0}", clients_array[i].ClientName);
 clients_array[i].MacAddress = String.Format("{0:x2}-{1:x2}-{2:x2}-{3:x2}-{4:x2}-{5:x2}",
 Marshal.ReadByte(curr_element.ClientHardwareAddress.Data),
 Marshal.ReadByte(curr_element.ClientHardwareAddress.Data, 1),
 Marshal.ReadByte(curr_element.ClientHardwareAddress.Data, 2),
 Marshal.ReadByte(curr_element.ClientHardwareAddress.Data, 3),
 Marshal.ReadByte(curr_element.ClientHardwareAddress.Data, 4),
 Marshal.ReadByte(curr_element.ClientHardwareAddress.Data, 5));
 Console.WriteLine("Client MAC {0}", UInt32IPAddressToString(curr_element.ClientIpAddress));
 //This section will throw an AccessViolationException
 //Marshal.DestroyStructure(current, typeof(DHCP_CLIENT_INFO));
 // current = (IntPtr)((int)current + (int)Marshal.SizeOf(curr_element));
 //Replace with:
 //Marshal.DestroyStructure(ptr_array[i], typeof(DHCP_CLIENT_INFO));
 }
 }

 public static uint StringIPAddressToUInt32(string ip_string)
 {
 IPAddress IpA = System.Net.IPAddress.Parse(ip_string);
 byte[] ip_bytes = IpA.GetAddressBytes();
 uint ip_uint = (uint)ip_bytes[0] &lt;&lt; 24;
 ip_uint += (uint)ip_bytes[1] &lt;&lt; 16;
 ip_uint += (uint)ip_bytes[2] &lt;&lt; 8;
 ip_uint += (uint)ip_bytes[3];
 return ip_uint;
 }

 public static string UInt32IPAddressToString(uint ipAddress)
 {
 IPAddress ipA = new IPAddress(ipAddress);
 string[] sIp = ipA.ToString().Split('.');

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



}
</code></pre>

}

I have a really large network. Class A network and due to security reasons broadcast and any other PING has been blocked. I want to get all the PC IP that are alive.

Is there any way to query DHCP server using C# to get all leased IP ?

Querying a DHCP server in C#

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个很大的网络。由于安全原因，A类网络广播和任何其他PING已被阻塞。我想要所有活着的个人电脑IP。是否有任何方法可以使用C#查询DHCP服务器以获得所有租用的IP？

问在C#中查询DHCP服务器
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