PowerShell - Start-Monitoring

Jon Boyette
Oct 12, 2022
7 min read

This is a great script used to Monitor and Email if a server is up or down, once ran, and smtp and from address is set, then run:

./Start-Monitoring.ps1 -RemoteHost 8.8.8.8 -EmailAddress alertme@gmail.com

.SYNOPSIS

Tests the connection to the supplied host or IP and reports back on changes to its status.

.DESCRIPTION

This script will check the connection to the supplied hostname or IP address every 5 second's to

monitor its status. If the status changes, a message is recorded, the Eventlog is update (optional), and an email is sent

to a supplied email address (optional).

If a TCPPort parameter is suppied the script will attempt to connect to this port. Otherwise a simple ICMP Ping is used.

To end monitoring, press CTRL-C

.PARAMETER RemoteHost

A String specifying host or IP address you'd like to monitor. You can also specify a TCPport here using host:port syntax.

.PARAMETER EmailAddress

A String specifying the email address to notify of status changes. If not supplied, or empty, emails are not sent.

In order to use this, first edit the script to supply a valid SMTP server, port, and from address.

.PARAMETER EventLog

If true, status changes are also recorded in the Windows Application EventLog.

In order to use this, first run this command at an Administrator Powershell Prompt:

> New-EventLog -LogName Application -Source MonitoringConnection

.PARAMETER NoNotify

If true, status changes will not show up as Windows notifications.

.PARAMETER Silent

If true, the script will not create any beeps as the status changes.

.PARAMETER Pause

The number of seconds to wait between tests. Default 5 seconds.

.PARAMETER TCPPort

If supplied, the script will test a connection to the supplied TCP port. If not supplied a ICMP Ping test is used.

.PARAMETER Namespace

If supplied, the script will run a query on this WMI Namespace on the supplied Host

.PARAMETER Class

If supplied, the script will run a query on this WMI Class of the supplied namespace on the supplied Host

.PARAMETER WMIProperty

The WMI Property to monitor. Any changes in value will be reported

.PARAMETER WMIFilter

The Filter used to identify the correct result in the WMI query.

.EXAMPLE

./Start-Monitoring google.com

.EXAMPLE

./Start-Monitoring -RemoteHost 8.8.8.8 -EmailAddress alertme@gmail.com

.EXAMPLE

./Start-Monitoring -RemoteHost 8.8.8.8 -EmailAddress alertme@gmail.com -EventLog $true

.EXAMPLE

./Start-Monitoring -RemoteHost 8.8.8.8 -TCPPort 53

.EXAMPLE

./Start-Monitoring -RemoteHost 8.8.8.8:53

.EXAMPLE

./Start-Monitoring -RemoteHost @("www.google.com:443","8.8.8.8:53")

.EXAMPLE

./Start-Monitoring -RemoteHost WebServer1 -Namespace "root\cimv2" -Class Win32_PerfRawData_APPPOOLCountersProvider_APPPOOLWAS -WMIProperty CurrentApplicationPoolState -WMIFilter "{$_.Name -like 'SLSS'}"

.NOTES

Version: 1.7

Author: Cameron McConnochie

Creation Date: 12 June 2020

Purpose/Change: Added support for host:port format to allow multiple host and port combos to monitor

Version: 1.6

Author: Cameron McConnochie

Creation Date: 16 Sept 2019

Purpose/Change: Added support for an array of hosts to monitor

Version: 1.5

Author: Cameron McConnochie

Creation Date: 17 June 2019

Purpose/Change: Added Core compatibility

Version: 1.4

Author: Cameron McConnochie

Creation Date: 22 March 2019

Purpose/Change: Added WMI monitoring

Version: 1.3

Author: Cameron McConnochie

Creation Date: 26 Feb 2019

Purpose/Change: Added Validation of the supplied hostname/IP

Version: 1.2

Author: Cameron McConnochie

Creation Date: 8 Oct 2018

Purpose/Change: Added Notifications

Version: 1.1

Author: Cameron McConnochie

Creation Date: 10 Aug 2018

Purpose/Change: Added TCP Port monitoring

Version: 1.0

Author: Cameron McConnochie

Creation Date: 26 July 2018

Purpose/Change: Initial script development

[CmdletBinding()]

Param(

[Parameter(Mandatory=$True,Position=1)]

[ValidateScript({

if ($_ -like "*:*") {

if($_.Split(":")[0] -As [IPAddress] -and $_.Split(":")[1] -As [Int]){

$True

}else {

if(([System.Net.Dns]::GetHostEntry($_.Split(":")[0])) -and $_.Split(":")[1] -As [Int]){

$True

}else{

Throw "$($_) is not a valid IP or hostname. Try again."

}

} elseif($_ -As [IPAddress]){

$True

} else {

if([System.Net.Dns]::GetHostEntry($_)){

$True

}else{

Throw "$($_) is not a valid IP or hostname. Try again."

}

})]

[string[]]$RemoteHost,

[Parameter(Mandatory=$False)]

[ValidateScript({

if($_ -Match "\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b" -or $_ -eq $null){

$True

} else {

Throw "$($_) is not a valid email address. Try again, or remove this parameter to skip email alerts."

}

})]

[mailaddress]$EmailAddress = $null,

[Parameter(Mandatory=$False)]

[switch]$EventLog,

[Parameter(Mandatory=$False)]

[switch]$NoNotify,

[Parameter(Mandatory=$False)]

[switch]$Silent,

[Parameter(Mandatory=$False)]

[int32]$Pause = 5,

[Parameter(Mandatory=$False,

ParameterSetName = 'Port')]

[int32]$TCPPort,

[Parameter(Mandatory=$true,

ParameterSetName = 'WMI')]

[string]$Namespace,

[Parameter(Mandatory=$true,

ParameterSetName = 'WMI')]

[string]$Class,

[Parameter(Mandatory=$true,

ParameterSetName = 'WMI')]

[string]$WMIProperty,

[Parameter(Mandatory=$False,

ParameterSetName = 'WMI')]

[scriptblock]$WMIFilter

)

######

# SMTP Mail Server Settings, edit these values in order to use email alerts

######

$SMTPServer = "SMTP Server"

$SMTPPort = 25

$SMTPFromAddress = "From Address"

#Script Starts here...

$RemoteHostStatus = 99 #1 = online, 2 = offline, 3 = undefined

[string]$WMIPrevious = "99" #Used to identify changes

#Error Check

#Confirm EventLog Source is configured if required

if($EventLog){

try{

[System.Diagnostics.EventLog]::SourceExists("MonitoringConnection") | Out-Null

}catch{

throw "In order to record to the EventLog, first run this command at an Administrator Powershell Prompt: `n`

> New-EventLog -LogName Application -Source MonitoringConnection"

}

if($EmailAddress -ne $null){

if(-not ((Test-NetConnection -ComputerName $SMTPServer -Port $SMTPPort).TcpTestSucceeded)){

throw "Unable to connect to the specified SMTP server. Confirm the settings in this script and retry `n`

$($SMTPServer) unreachable on port $($SMTPPort)"

}

#Clear the progress bar

Write-Progress -Activity "Test-NetConnection - $($SMTPServer):$($SMTPPort)" -Completed

}

#Deal with an Array first

If($RemoteHost.Count -gt 1){

Write-Host "Monitoring the connection status of $($RemoteHost)" -ForegroundColor Blue

Write-Host " press CTRL-C to stop" -ForegroundColor Blue

Write-Host ""

Write-Progress -Activity "Monitoring connection status of $($RemoteHost)" -id $PID -Status "..."

# Change the default behavior of CTRL-C so that the script can intercept and use it versus just terminating the script.

[Console]::TreatControlCAsInput = $True

# Sleep for 1 second and then flush the key buffer so any previously pressed keys are discarded and the loop can monitor for the use of

# CTRL-C. The sleep command ensures the buffer flushes correctly.

Start-Sleep -Seconds 1

$Host.UI.RawUI.FlushInputBuffer()

$Jobs = @()

$ScriptPath = $MyInvocation.MyCommand.Definition

#Shared

$ScriptArgs = @{

EventLog = $EventLog

NoNotify = $NoNotify

Silent = $Silent

Pause = $Pause

}

if($EmailAddress){$ScriptArgs.Add("EmailAddress", $EmailAddress)}

#Unique

If($TCPPort){

# Port Query

if($TCPPort){$ScriptArgs.Add("TCPPort", $TCPPort)}

}elseIf($Namespace){

# WMI Query

if($Namespace){$ScriptArgs.Add("Namespace",$Namespace)}

if($Class){$ScriptArgs.Add("Class",$Class)}

if($WMIProperty){$ScriptArgs.Add("WMIProperty",$WMIProperty)}

if($WMIFilter){$ScriptArgs.Add("WMIFilter",$WMIFilter)}

}else{

# Ping Query

}

$RemoteHost | ForEach-Object {

$Jobs += Start-Job -Name "Monitor-$($_)" -ScriptBlock {param($ScriptPath, $RemoteHost, $ScriptArgs)

$ScriptArgs.Add("RemoteHost",$RemoteHost)

&$ScriptPath @ScriptArgs

} -ArgumentList @($ScriptPath, $_, $ScriptArgs)

}

While ((Get-Job | Where-Object {$_.Name -like "Monitor-*"}).Count -gt 0) {

Receive-Job -Job $Jobs

# If a key was pressed during the loop execution, check to see if it was CTRL-C (aka "3"), and if so exit the script after clearing

# out any running jobs and setting CTRL-C back to normal.

If ($Host.UI.RawUI.KeyAvailable -and ($Key = $Host.UI.RawUI.ReadKey("AllowCtrlC,NoEcho,IncludeKeyUp"))) {

If ([Int]$Key.Character -eq 3) {

Write-Host ""

Write-Warning "CTRL-C was used - Shutting down any running jobs before exiting."

Get-Job | Where-Object {$_.Name -like "Monitor-*"} | Remove-Job -Force -Confirm:$False

[Console]::TreatControlCAsInput = $False

Return

}

# Flush the key buffer again for the next loop.

$Host.UI.RawUI.FlushInputBuffer()

}

#Add a small pause to ease CPU load

Start-Sleep -Milliseconds 200

}

#Extract TCP Port if encoded in Host

If ($RemoteHost -like "*:*") {

$TCPPort = [Int32]$RemoteHost.Split(":")[1]

$RemoteHost = $RemoteHost.Split(":")[0]

}

If($Host.Name -ne "ServerRemoteHost"){

Write-Host "Monitoring the connection status of $($RemoteHost)" -ForegroundColor Blue

Write-Host " press CTRL-C to stop" -ForegroundColor Blue

Write-Host ""

}

#Setup Nofitications

If (-not $NoNotify){

$AppId = '{1AC14E77-02E7-4E5D-B744-2EB1AE5198B7}\WindowsPowerShell\v1.0\powershell.exe'

$null = [Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime]

$null = [Windows.Data.Xml.Dom.XmlDocument, Windows.Data.Xml.Dom.XmlDocument, ContentType = WindowsRuntime]

$WarningLogo = "$env:TEMP\ToastWarningLogo.png"

if (-not (Test-Path $WarningLogo)){

$Logo = "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"

[byte[]]$Bytes = [convert]::FromBase64String($Logo)

[System.IO.File]::WriteAllBytes($WarningLogo,$Bytes)

}

$InfoLogo = "$env:TEMP\ToastInfoLogo.png"

if (-not (Test-Path $InfoLogo)){

$Logo = "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"

[byte[]]$Bytes = [convert]::FromBase64String($Logo)

[System.IO.File]::WriteAllBytes($InfoLogo,$Bytes)

}

While ($true){

If ($TCPPort){

#This test is used to reduce the timeout - thanks to Jan Doggen: https://superuser.com/questions/805621/test-network-ports-faster-with-powershell

$tcpclient = new-Object system.Net.Sockets.TcpClient

$iar = $tcpclient.BeginConnect($RemoteHost,$TCPPort,$null,$null)

$wait = $iar.AsyncWaitHandle.WaitOne(2000,$false)

if(!$wait)

{

# Close the connection and report timeout

$tcpclient.Close()

$Result = $null

}

else

{

# Close the connection and report the error if there is one

$error.Clear()

Try{

$tcpclient.EndConnect($iar) | out-Null

}catch{}

if(!$?){

$Result = $null

}else{

$Result = "Success"

}

$tcpclient.Close()

}

$OKStatus = "listening on $($TCPPort)"

$ErStatus = "not listening on $($TCPPort)"

}elseif($WMIProperty){

if($Pause -lt 30){

Write-Host "A pause of only $($Pause) between WMI queries will strain the remote host. Adjusting to 30 seconds."

$Pause = 30

}

$WMIResult = Get-WmiObject -Namespace $Namespace -Class $Class -ComputerName $RemoteHost

if($WMIFilter){

$WMIResult = $WMIResult.Where($WMIFilter)

}

if($WMIResult.Count -gt "1"){

throw "Multiple WMI results found, check you're using a valid filter."

}elseif($WMIResult.Count -eq "0"){

$WMIResult = "NotFound"

}else{

#If a single result found, update the result to its value

$WMIResult = $WMIResult | Select-Object -ExpandProperty $WMIProperty

}

#Always return a Result of 1, just use the RemoteHostStatus variable to mark it as a different/a change.

$Result = 1

if($WMIResult -ne $WMIPrevious){

#No change, Update history value to highlight change

$RemoteHostStatus = 0

}else{

#No change, Update history value to highlight change

$RemoteHostStatus = 1

}

$WMIPrevious = $WMIResult

$ErStatus = $OKStatus = "$($WMIProperty) has status $($WMIResult)"

}else{

$Result = Test-Connection -Count 1 -ComputerName $RemoteHost -Quiet

$OKStatus = "online"

$ErStatus = "offline"

}

If($Result){

#Host is online/good

If($RemoteHostStatus -ne 1){

#New Status

Write-Host " $($RemoteHost) $($OKStatus) at $(Get-Date -Format G)" -ForegroundColor Green

If($Host.Name -ne "ServerRemoteHost"){

#{ $Host.PrivateData = 'DarkCyan' }

Write-Progress -id $PID -Activity " Monitoring connection status of $($RemoteHost)" -Status (Get-Culture).TextInfo.ToTitleCase($OKStatus.ToLower())

}

If(-not $Silent){

[console]::beep(2000,300)

}

If(-not $NoNotify){

Write-Debug "Showing notification"

$XmlString = @("

<text>$($RemoteHost) $($OKStatus)</text>

<text>$($RemoteHost) $($OKStatus) at $(Get-Date -Format G)</text>

</binding>

</visual>

</toast>

$ToastXml = [Windows.Data.Xml.Dom.XmlDocument]::new()

$ToastXml.LoadXml($XmlString)

$Toast = [Windows.UI.Notifications.ToastNotification]::new($ToastXml)

[Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier($AppId).Show($Toast)

}

If($EmailAddress -ne $null){

$Message = "$($RemoteHost) $($OKStatus) at $(Get-Date -Format G)"

Send-MailMessage -To $EmailAddress -Body $Message -BodyAsHtml -From $SMTPFromAddress -SmtpServer $SMTPServer -Port $SMTPPort -Subject "$($RemoteHost) $($OKStatus)"

}

If($EventLog){

Write-EventLog -LogName Application -Source MonitoringConnection -Message "$($RemoteHost) $($OKStatus)" -EventId 8000 -EntryType Information

}

$RemoteHostStatus = 1

}

}else{

#Host is offline/changed

If($RemoteHostStatus -ne 0){

#New Status

Write-Host " $($RemoteHost) $($ErStatus) at $(Get-Date -Format G)" -ForegroundColor Red

If($Host.Name -ne "ServerRemoteHost"){ $Host.PrivateData.ProgressBackgroundColor='Red' }

Write-Progress -id $PID -Activity " Monitoring connection status of $($RemoteHost)" -Status (Get-Culture).TextInfo.ToTitleCase($ErStatus.ToLower())

If(-not $Silent){

[console]::beep(500,300)

}

If($EmailAddress -ne $null){

$Message = "$($RemoteHost) $($ErStatus) at $(Get-Date -Format G)"

Send-MailMessage -To $EmailAddress -Body $Message -BodyAsHtml -From $SMTPFromAddress -SmtpServer $SMTPServer -Port $SMTPPort -Subject "$($RemoteHost) $($ErStatus)"

}

If(-not $NoNotify){

Write-Debug "Showing notification"

$XmlString = @("

<text>$($RemoteHost) $($ErStatus)</text>

<text>$($RemoteHost) $($ErStatus) at $(Get-Date -Format G)</text>

</binding>

</visual>

</toast>

$ToastXml = [Windows.Data.Xml.Dom.XmlDocument]::new()

$ToastXml.LoadXml($XmlString)

$Toast = [Windows.UI.Notifications.ToastNotification]::new($ToastXml)

[Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier($AppId).Show($Toast)

}

If($EventLog){

Write-EventLog -LogName Application -Source MonitoringConnection -Message "$($RemoteHost) $($ErStatus)" -EventId 8001 -EntryType Warning

}

$RemoteHostStatus = 0

}

#Pause before trying again

Start-Sleep -Seconds $Pause

}

PowerShell - Start-Monitoring

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