Any ideas on how to read DHCP information, such as lease start and stop dates for a client where the App is running?

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After spending a day or two wandering around the net and inside the archive at Microsoft, I am starting to think I am looking for the holy grail. I am writing a little application that is basically ipconfig.exe as a windows app. And I have most of it figured out, except for things like the lease info, which I would like to have for completeness if nothing else. The new app is in C#. Any signposts or thoughts would be welcome.

Rand Ruggles
[email removed]

Posted 9-Oct-12 10:49am

Rand Ruggles

Updated 9-Oct-12 10:54am

Zoltán Zörgő

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Zoltán Zörgő 9-Oct-12 16:54pm

Email removed in your interest. Don't expose yourself to spammers!

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**Zoltán Zörgő** · Accepted Answer · 2012-10-09T10:58:00

Solution 1

You can access these data via the Win32_NetworkAdapterConfiguration[^] WMI class.
Here[^] is a short code sample how to access the class properties:

C#

//create a management scope object
ManagementScope scope = new ManagementScope("\\\\.\\ROOT\\cimv2");

//create object query
ObjectQuery query = new ObjectQuery("SELECT * FROM Win32_NetworkAdapterConfiguration");

//create object searcher
ManagementObjectSearcher searcher =
                        new ManagementObjectSearcher(scope, query);

//get collection of WMI objects
ManagementObjectCollection queryCollection = searcher.Get();

//enumerate the collection.
foreach (ManagementObject m in queryCollection) 
{
// access properties of the WMI object
  Console.WriteLine("ArpAlwaysSourceRoute : {0}", m["ArpAlwaysSourceRoute"]);
  
}

Posted 9-Oct-12 10:58am

Zoltán Zörgő

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Rand Ruggles 9-Oct-12 17:42pm

Hello Zoltan, and thank you on two fronts. I just tried the code you submitted, and it was behaving very slugishly, even for COM objects. And when it came back, it was basically reporting nothings as it seemed some of its functionality was timing out when I was walking through the object trees. I have used that code with a different query that worked as far as pulling up info on each of the adapters. Yet leasing info was not in the set for each NIC. Please realize my little app is designed to run on the client, and just interogate client resources if at all possible, not sitting on the server and sorting through everything up there.

Zoltán Zörgő 10-Oct-12 2:28am

I have the tool for you to generate the wmi query code directly in C#, it is called WMIgen: http://www.robvanderwoude.com/wmigen.php
And an other one if you want to see what wmi is reporting: http://www.ks-soft.net/hostmon.eng/wmi/index.htm.
This is what the generator generated with just a click of a button:


// WMI query to list all properties and values of the root\CIMV2:Win32_NetworkAdapterConfiguration class.
// This C# code was generated using the WMI Code Generator, Version 7.03
// http://www.robvanderwoude.com/wmigen.php

using System;
using System.Linq;
using System.Management;

namespace WMIGen
{
	public class Win32_NetworkAdapterConfiguration_Query
	{
		public static int Main(string[] args)
		{
			try
			{
				string computer = string.Empty;
				if (args.Count() == 1)
				{
					computer = @"\\" + args[0] + @"\";
				}

				ManagementObjectSearcher searcher = new ManagementObjectSearcher(computer + @"root\CIMV2", "SELECT * FROM Win32_NetworkAdapterConfiguration");
				ManagementObjectCollection colItems = searcher.Get( );

				Console.WriteLine( "{0} instance{1}", colItems.Count, ( colItems.Count == 1 ? String.Empty : "s" ) );
				Console.WriteLine( );

				foreach ( ManagementObject queryObj in colItems )
				{
					Console.WriteLine("ArpAlwaysSourceRoute         : {0}", queryObj["ArpAlwaysSourceRoute"]);
					Console.WriteLine("ArpUseEtherSNAP              : {0}", queryObj["ArpUseEtherSNAP"]);
					Console.WriteLine("Caption                      : {0}", queryObj["Caption"]);
					Console.WriteLine("DatabasePath                 : {0}", queryObj["DatabasePath"]);
					Console.WriteLine("DeadGWDetectEnabled          : {0}", queryObj["DeadGWDetectEnabled"]);
					if (queryObj["DefaultIPGateway"] == null)
					{
						Console.WriteLine("DefaultIPGateway             : {0}", queryObj["DefaultIPGateway"]);
					}
					else
					{
						string[] arrProperty = (string[])(queryObj["DefaultIPGateway"]);
						Console.Write("DefaultIPGateway             : ");
						Console.WriteLine(string.Join(";", arrProperty.Select(cap => cap.ToString()).ToArray()));
					}
					Console.WriteLine("DefaultTOS                   : {0}", queryObj["DefaultTOS"]);
					Console.WriteLine("DefaultTTL                   : {0}", queryObj["DefaultTTL"]);
					Console.WriteLine("Description                  : {0}", queryObj["Description"]);
					Console.WriteLine("DHCPEnabled                  : {0}", queryObj["DHCPEnabled"]);
					Console.WriteLine("DHCPLeaseExpires             : {0}", queryObj["DHCPLeaseExpires"]);
					Console.WriteLine("DHCPLeaseObtained            : {0}", queryObj["DHCPLeaseObtained"]);
					Console.WriteLine("DHCPServer                   : {0}", queryObj["DHCPServer"]);
					Console.WriteLine("DNSDomain                    : {0}", queryObj["DNSDomain"]);
					if (queryObj["DNSDomainSuffixSearchOrder"] == null)
					{
						Console.WriteLine("DNSDomainSuffixSearchOrder   : {0}", queryObj["DNSDomainSuffixSearchOrder"]);
					}
					else
					{
						string[] arrProperty = (string[])(queryObj["DNSDomainSuffixSearchOrder"]);
						Console.Write("DNSDomainSuffixSearchOrder   : ");
						Console.WriteLine(string.Join(";", arrProperty.Select(cap => cap.ToString()).ToArray()));
					}
					Console.WriteLine("DNSEnabledForWINSResolution  : {0}", queryObj["DNSEnabledForWINSResolution"]);
					Console.WriteLine("DNSHostName                  : {0}", queryObj["DNSHostName"]);
					if (queryObj["DNSServerSearchOrder"] == null)
					{
						Console.WriteLine("DNSServerSearchOrder         : {0}", queryObj["DNSServerSearchOrder"]);
					}
					else
					{
						string[] arrProperty = (string[])(queryObj["DNSServerSearchOrder"]);
						Console.Write("DNSServerSearchOrder         : ");
						Console.WriteLine(string.Join(";", arrProperty.Select(cap => cap.ToString()).ToArray()));
					}
					Console.WriteLine("DomainDNSRegistrationEnabled : {0}", queryObj["DomainDNSRegistrationEnabled"]);
					Console.WriteLine("ForwardBufferMemory          : {0}

Rand Ruggles 10-Oct-12 10:32am

Thank You Zoltan. I did some more digging last night and this morning. I am dev/testing this on my laptop to minimize the port count, and I was making a bad assumption that I would only have to iterate through a query result of about three adapters. The code is actually returning a query result of 23!