# Test DAG Replication Health
# 
# This script will execute the Test-ReplicationHealth command and look for warnings for failed replications inside a Exchange 2010 DAG via powershell and nsclient++ 
# 
# 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
# 2011-01-02	Bastian W. [Bastian@gmx-ist-cool.de]	1.0
# 2011-09-19	Bastian W. [Bastian@gmx-ist-cool.de]	1.1 code adjusted:
#															* checked if PSSnapin is loaded
# 2012-07-03	Bastian W. [Bastian@gmx-ist-cool.de]	1.2 code adjusted:
#															* fixed a small spelling issue
#
# To execute from within NSClient++
#
#[NRPE Handlers]
#check_exchange_dag_replication_health=cmd /c echo C:\Scripts\Nagios\NagiosMonitoring_ExchangeDAGReplicationHealth.ps1 | PowerShell.exe -Command -
#
# On the check_nrpe command include the -t 20, since it takes some time to load the Exchange cmdlet's.

if ( (Get-PSSnapin -Name Microsoft.Exchange.Management.PowerShell.E2010 -ErrorAction:SilentlyContinue) -eq $null)
{
    Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010
}

$NagiosStatus = "0"
$NagiosDescription = ""

ForEach ($Type in Test-ReplicationHealth -Identity $env:computername) 
{

 	
	if ($Type.Result -like "*FAILED*") 
	{
	# Look for failed replications
	
		# Format the output for Nagios
		if ($NagiosDescription -ne "") 
		{
			$NagiosDescription = $NagiosDescription + ", "
		}
		
		#$NagiosDescription = $NagiosDescription + $Type.Check +" "+ $Type.Result +" "+  $Type.Error
		$NagiosDescription = $NagiosDescription + $Type.Check +" "+ $Type.Result
		
		# Set the status to failed
		$NagiosStatus = "2"
	
	} 
	elseif ($Type.Check -like "*Warn*") 
	{
	# Look for warnings in replication
	
		
		if ($NagiosDescription -ne "") 
		{
			# Format the output for Nagios
			$NagiosDescription = $NagiosDescription + ", "
		}
		
		#$NagiosDescription = $NagiosDescription + $Type.Check +" "+ $Type.Result +" "+  $Type.Error
		$NagiosDescription = $NagiosDescription + $Type.Check +" "+ $Type.Result
		
		
		if ($NagiosStatus -ne "2") 
		{
			# Don't lower the status level if we already have a failed attempt
			$NagiosStatus = "1"
		}
	}
}

# Output, when should we push out a notification to nagios?
if ($NagiosStatus -eq "2") 
{
	Write-Host "CRITICAL:" $NagiosDescription
} 
elseif ($NagiosStatus -eq "1") 
{
	Write-Host "WARNING:" $NagiosDescription
} 
else 
{
	Write-Host "OK: All replication tests passed."
}

exit $NagiosStatus