How to check open ports using powershell? - powershell

Question

I would like to write a script to check radom IP or hostname to see if ports are open. Here is what I have so far. The scripts name is checkports.
foreach ($xhost in $computername){
Write-Host $xhost
foreach ($port in $ports) {
$Socket = New-Object System.Net.Sockets.TCPClient
$Connection = $Socket.BeginConnect($xhost,$port,$null,$null)
$Connection.AsyncWaitHandle.WaitOne(5000,$false) | out-null
if ($Connection -eq $true)
{ write-host = "$xhost port $port is open" }
else
{ write-host = "port $port is closed" }
$Socket.EndConnect($Connection)
$Socket.Close()
}
}
I would like to input values in the following way:
.\checkport '192.186.1.5'
or
'192.168.1.5', '192.168.1.105', 192.168.1.110' | checkport
It doesn't seem to be reading IP address or displaying results.
I was wondering if anyone could point out there could show me what I am doing wrong in with this script?

Answer 1

I've been able to use the 'Test-Port' function from Boe Prox for similar scan/ reporting functions, the code is available on PoshCode:
http://poshcode.org/2514
When I needed to test ports for Directory health, I built a csv with 'port' and 'protocol' columns, then added the port number/ protocol for each port to check. This was used in the following script:
. .\test-port.ps1
$computersToCheck = get-content .\computers.txt
$portList = Import-CSV .\portList.csv
foreach($entry in $portList)
{
$testPortParams = #{
port = $($entry.port)
}
if( $($entry.protocol) -eq "tcp")
{ $testPortParams += #{ TCP = $true } }
else
{ $testPortParams += #{ UDP = $true } }
$outLog = "portTest-$($entry.port)-$($entry.protocol).txt"
$computersToCheck |
Test-Port #testPortParams |
Sort-Object -Property open,name -descending |
format-table -auto -outVariable status
Add-Content -path $outLog -value $status
}
You could certainly build a feeder script to build the range of IP addresses and ports to scan.