In a WMI sensor, how do I store the value returned from a registry key to a field in the CI record?

[HugoFirst]

Context: Discovering a Windows Server using WMI/Powershell.

I need to populate a field named u_patch_host from a value stored in the registry key

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\WUServer

In the WMI Fields related list to the WMI Probe: Windows - OS Information,   I add a field with the WMI patch set to the registry key named above.

The package is set to "Global" and I'm unable to set it to "Core Automation".   Don't know why.

I ran a discovery of a Windows Server and the probe returns a server name as expected.

But I can't access the value in the sensor to save it to the proper field in the current CI record.

Can you give me any advice?   I can't even find an error in the log to debug this.

So I'm open to ideas and advice.

Thanks in advance for your help.

[HugoFirst]

I want to provide some more information in the hope that it triggers some thoughts which may lead to resolution.

Here is an image of the WMI probe "Windows - OS Information" to show the key I'm fetching.   Note that the package is "Global" and not "Core Automation".   I tried to change it, but I can't.

The probe is returning a value ( which is blurred in the image below )

In the sensor I added this line of code to the parseResult function:

current.u_patch_host = result.Registry.HKEY_LOCAL_MACHINE.SOFTWARE.Policies.Microsoft.Windows.WindowsUpdate.WUServer;

This did not work.

I researched other sensors and found code using a utility named g_disco_functions.   I tried the following code too.   but not dice 😞

               var patchServerKey = 'HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate';
               var node = g_disco_functions.findRegistryNode(result.Registry, patchServerKey);
               var patchServer = g_disco_functions.findNodeValueWithAttribute(node, "WUServer");
               current.u_patch_host = patchServer;

Can anyone give me any clues on how to debug a sensor?

[Ryan Zulli]

Hi Steve,

It may help to provide the whole sensor - as another example I got working take a look at this New Discovery sensor not able to read a registry node

Let me know if this helps, if not let me know and we can debug.

Thanks,-Ryan

[HugoFirst]

Hello Ryan,   Thank you for the pointer!   I continue to pursue this with a "trial and error" approach.   You're link gave me an idea and the following code is the sensor script in its entirety.   My part is denoted by some comments.   Again, the name of the sensor is Windows - OS Information, and most of the script is OOB.   Note that the   gs.log comments do appear in the log and that code is running.   The value for patch_cycle, logged in line 36,   is null in the system log though.

new DiscoverySensor({
       process: function(result) {
               this.parseResult(result);
       },


       parseResult: function(result) {
               current.os_version = result.Win32_OperatingSystem.Version;
               current.os_service_pack = result.Win32_OperatingSystem.CSDVersion;


               var man = result.Win32_ComputerSystem.Manufacturer;
               var mod = result.Win32_ComputerSystem.Model;


               var mm = MakeAndModelJS.fromNames(man, mod, "hardware");
               current.manufacturer = mm.getManufacturerSysID();
               current.model_id = mm.getModelNameSysID();
               current.short_description = result.Win32_OperatingSystem.Description;


               // Contrary to what the name implies, this returns *OS* address width, not CPU
               var processors = g_array_util.ensureArray(result.Win32_Processor);
               current.os_address_width = processors[0].AddressWidth;


               this.setAssignedTo(result);
//
// This code is to set the Patch Cycle
// Reference: https://community.servicenow.com/message/787029#787029
gs.log("Windows - OS   Information: Patch Cycle.   Got to 26");
var regKey = "HKEY_LOCAL_MACHINE.SOFTWARE.Policies.Microsoft.Windows.WindowsUpdate"; // try with dots between the levels.
var node = g_disco_functions.findRegistryNode(output.Registry, regKey);
       var patch_cycle = g_disco_functions.findNodeValueWithAttribute(node, "TargetGroup");
current.u_patch_cycle = patch_cycle;
gs.log("Windows - OS   Information: Patch Cycle.   Got to 31, patch_cycle = " + patch_cycle);
// end of code to set the Patch Cycle
       },


       setAssignedTo: function(result) {
               var userName = result.Win32_ComputerSystem.UserName;


               if (!gs.nil(userName)) {
                       var x = userName.indexOf("\\");


                       if (x > -1)
                               userName = userName.substring(x + 1);


                       var nameField = gs.getProperty('glide.discovery.assigned_user_match_field', "user_name");
                       var userID = GlideUser.getSysId(nameField, userName);

                       var atOverwrite = JSUtil.toBoolean(gs.getProperty('glide.wmi.assigned_to_always_overwrite', "true"));
                       if (!atOverwrite)
                               if (this._isAssignedToFilled())
                                       return;

                       current.assigned_to = userID;
               }
       },

       /*
         * Is the assigned_to field already populated? Return true if yes; false if no.
         */
       _isAssignedToFilled: function() {
               var compGr = this.getCmdbRecord();
               if (JSUtil.notNil(compGr.assigned_to + ''))
                       return true;

               return false;
       },


       type: "DiscoverySensor"
});

[Ryan Zulli]

What value(s) should we expect back from the windowsUpdate/TargetGroup registry entry?   I also do not get anything back when testing against my own Windows 2008 Server machine.   I was looking here for reference Configure Automatic Updates using Registry Editor