# Microsoft ActiveDirectory - Domain Controller Services Check 
#
# This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# Revision History:
# 2012-08-23	Bastian W. [Bastian@gmx-ist-cool.de]		1.0 (initial version)
# 2012-09-04	Bastian W. [Bastian@gmx-ist-cool.de]		1.1 code adjusted:
#															* Fixed a problem where some services couldnīt be detected correctly (thanks Steve H.)
# 2016-03-05	Bastian W. [Bastian@gmx-ist-cool.de]		1.2 code adjusted:
#																* updated script for Windows 2012R2 compatibility
#
# Info:
# This powershell plugin for the NSClient++ can be used to monitor the services used by a Microsoft ActiveDirectory Domain Controller based on Windows 2008
#
#
# FAQ:
#	How To solve "cannot be loaded because the execution of scripts is disabled on this system. Please see "get-help about_signing" for more details."
# 	See: http://technet.microsoft.com/en-us/library/ee176949.aspx [a possible solution would be 'Set-ExecutionPolicy RemoteSigned']
#
# Installation:
#
# 1.)
# Create a folder on C:\ called "NagiosMonitoring" if it didnīt exist, and put this script into that folder.
#
# Note: If you use another Foldername, you need to change this script completly!
#
# 2.)
# Now start a Powershell and run the following comands (to test if the script is working for you)
# "C:"
# "cd NagiosMonitoring"
# ".\NagiosMonitoring_AD_DomainControllerServicesCheck.ps1"
#
# 3.)
# Add this script to the NSClient++ configuration (file: NSC.ini)
#
# [External Scripts]
# DomainControllerServicesCheck=cmd /c echo C:\NagiosMonitoring\NagiosMonitoring_AD_DomainControllerServicesCheck.ps1 | PowerShell.exe -Command -
#
# On the check_nrpe command include the -t 30, since it takes some time to load the Exchange cmdlet's.
# 
# 4.)
# uncommend CheckExternalScripts.dll in the NSClient++ configuration (file: NSC.ini)
#
# 5.)
# You need to edit the config below
#
#   Configuration:
#   ====================
#   Create a subset of the previous array for services you want to monitor
#   Syntax: $ServicesToCheckArray=@("Service1","Service2","Service3","Service4","Service5");
	$ServicesToCheckArray=@("kdc","DNS","NTDS","ADWS","Netlogon")
#
# 6.)
# restart the NSClient++ Service


# =========================================================================================================================
#
# ------------- Do not change anything behind that line ! ----------------------------
#

# initialize vars/reset vars to zero
$intNagiosStatus = "0"
$strNagiosDescription = ""
$strServiceNotFound = ""
$bDebug = 0

#Create an array of all services running
$GetService = get-service -ComputerName $env:computername

#Find any iWFM service that is stopped
foreach ($Service in $GetService)
{

	foreach ($strServiceToCheck in $ServicesToCheckArray)
	{
	
		if ($Service.Name -eq $strServiceToCheck)
		{
		
			if ($bDebug -eq 1){ Write-Host " DEBUG: Service:"$Service.Name"eq"$strServiceToCheck" we will check it!" -foregroundcolor yellow}
			
				if ($Service.Status -eq "StopPending")
				{
				#check if a service is hung
			
					#automatically restart the service.
					#$servicePID = (gwmi win32_Service | where { $_.Name -eq $strServiceToCheck}).ProcessID
					#Stop-Process $ServicePID
					#Start-Service -InputObject (get-Service -ComputerName $env:computername -Name $strServiceToCheck)
					
					if ($strNagiosDescription -eq "")
					{
						# $strNagiosDescription = $strServiceToCheck + " (pending)"
						$strNagiosDescription = $Service.DisplayName + " (pending)"
					}
					else
					{
						#$strNagiosDescription = $strNagiosDescription + ", " + $strServiceToCheck + " (pending)"
						$strNagiosDescription = $strNagiosDescription + ", " + $Service.DisplayName + " (pending)"
					}
					
					if ($intNagiosStatus -ne "2")
					{
						# Don't lower the status level if we already have a critical state, otherwiese set it to critical
						$intNagiosStatus = "2"
					}				
				}           
				elseif ($Service.Status -eq "Stopped")
				{
				# check if a service is stopped
			
					#automatically restart the service.
					#Start-Service -InputObject (get-Service -ComputerName $env:computername -Name $strServiceToCheck)
						
					if ($strNagiosDescription -eq "")
					{
						#$strNagiosDescription = $strServiceToCheck + " (stopped)"
						$strNagiosDescription = $Service.DisplayName + " (stopped)"
					}
					else
					{
						#$strNagiosDescription = $strNagiosDescription + ", " + $strServiceToCheck + " (stopped)"
						$strNagiosDescription = $strNagiosDescription + ", " + $Service.DisplayName + " (stopped)"
					}
				
					if ($intNagiosStatus -ne "2")
					{
						# Don't lower the status level if we already have a critical state, otherwiese set it to warning
						$intNagiosStatus = "1"
					}
				}
				
				
				# the service we will check here can be removed from the to be checked array now!
				$ServicesToCheckArray = @($ServicesToCheckArray | Where-Object {$_ -ne $strServiceToCheck})			
				if ($bDebug -eq 1){ Write-Host " DEBUG: New to be checked array:"$ServicesToCheckArray -foregroundcolor yellow}
		}
	
	}
}

foreach ($strServiceNotFound in $ServicesToCheckArray)
{
			# seamed the service we should control here is missing		
		if ($strNagiosDescription -eq "")
		{
			$strNagiosDescription = $strServiceNotFound + " (not found)"
		}
		else
		{
			$strNagiosDescription = $strNagiosDescription + ", " + $strServiceNotFound + " (not found)"
		}
				
		if ($intNagiosStatus -ne "2")
		{
			# Don't lower the status level if we already have a critical state, otherwiese set it to critical
			$intNagiosStatus = "2"
		}
			
}  


# Output, when should we push out a notification to nagios?
if ($intNagiosStatus -eq "2") 
{
	Write-Host "CRITICAL:" $strNagiosDescription
} 
elseif ($intNagiosStatus -eq "1") 
{
	Write-Host "WARNING:" $strNagiosDescription
} 
else 
{
	Write-Host "OK: All services are up and running"
}

exit $intNagiosStatus