test net ports from mr bush

testnetforpuppet.ps1

[CmdletBinding()]
Param (
  [Parameter(Mandatory = $True)]
  [String]
  $target_node,
 
  [Parameter(Mandatory = $True)]
  [Int]
  $target_port
)
 
# Make all errors terminating
$ErrorActionPreference = 'Stop'
 
# If the value for $target_node contains letters, assume it's a hostname and try a DNS lookup before proceeding,
# but don't output the lookup results. If the lookup fails, the script will exit at this point.
if ($target_node -match '[a-zA-Z]') { Resolve-DnsName $target_node > $null }
 
# With an IP or resolvable hostname supplied, run the port test. If no errors are thrown, output a success message.
try {
  (New-Object Net.Sockets.TcpClient).Connect($target_node, $target_port)
  Write-Output "Port $target_port on $target_node is OPEN"
}
 
# If an error is thrown during port test, write a failure message.
catch {
  Write-Error "Port $target_port on $target_node is CLOSED"
}