pingTest.ps1

# @author Petalousa
#
# This file pings google's dns (8.8.8.8) every second to confirm connectivity
# if a ping to google fails, the script will ping the router (192.168.0.1)
#  - if it can connect, the failure to connect to google and successful connection to the router is logged
#  - if it canot connect, the failure to connect to google and the router is logged
# if the script was previously unable to ping google and now is able to ping google, the success will be logged
#


$LogFile = "variableConnectionTest.log"

$ExternalHost = "8.8.8.8"
$LocalHost = "192.168.0.1"

$CurrState = $true
$PrevState = $true

Write-Host "Running pingTest"

while ($true){
	$PingInstance = Get-CIMInstance -ClassName Win32_PingStatus  -Filter "Address='$ExternalHost' AND Timeout=1000";
	$Status = $PingInstance.StatusCode
	
	$LocalPingInstance = $null
	$LocalStatus = $null
	
	
	if ($Status -eq 0){
		# Write-Host "$(Get-Date) pinging $ExternalHost - $($PingInstance.ResponseTime) ms"
		$CurrState = $true
	}else{
		$LocalPingInstance = Get-CIMInstance -ClassName Win32_PingStatus  -Filter "Address='$LocalHost' AND Timeout=50";
		$LocalStatus = $LocalPingInstance.StatusCode
		$CurrState = $false
	}

	
	# if no connection is occuring
	if($CurrState -eq $false){
		if($LocalStatus -eq 0){
			# if the router can be pinged
			$ErrorString = "$(Get-Date) pinging $ExternalHost - failure; pinging $LocalHost - success"
			Write-Host $ErrorString
			Add-Content -Path $LogFile -Value $ErrorString
		}else{
			# if the router cannot be pinged
			$ErrorString = "$(Get-Date) pinging $ExternalHost - failure; pinging $LocalHost - failure"
			Write-Host $ErrorString
			Add-Content -Path $LogFile -Value $ErrorString
		}
	}elseif($PrevState -ne $CurrState){
		# if the script regained connection
		$ErrorString = "$(Get-Date) pinging $ExternalHost - success"
		Write-Host $ErrorString
		Add-Content -Path $LogFile -Value $ErrorString
	}
	
	# update PrevState
	$PrevState = $CurrState
			
	Start-Sleep -s 1
}