44 lines
1.6 KiB
PowerShell
44 lines
1.6 KiB
PowerShell
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function Get-DynamicPortFromHostname {
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<#
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.SYNOPSIS
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Used to convert a hostname to a dynamic port assignment. Mostly used to allow stacking multiple applications on one website hostname without breaking functionality on the same server
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.PARAMETER Hostname
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The hostname to derive a port for.
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.OUTPUTS
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Returns a single int that is between 5000 and 65535 for port assignment.
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#>
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[CmdletBinding()]
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[OutputType([int])]
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param (
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[Parameter(Mandatory = $true)]
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$Hostname
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)
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$logLead = (Get-LogLeadName)
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$output = ""
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$websiteBytes = [System.Text.Encoding]::UTF8.GetBytes($Hostname)
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$hashBytes = [System.Security.Cryptography.MD5]::Create().ComputeHash($websiteBytes)
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for($i = 0; $i -lt $hashBytes.Length; $i++) {
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$output += $hashBytes[$i].ToString("X2")
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}
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# We only want the last 4 digits of the array, that can give us up to 5 digits once converted from Hex
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$output = $output[-4..-1] -join ''
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$outputPort = [System.Convert]::ToInt32($output, 16)
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# Why 65535? Because that's the maximum port number for TCP ports
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# Honestly, if our array was FFFF it should only be 65535 anyways
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# We converted from Hex at 4 chars, so it should be fine here
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# But if something gets modified above, we could end up with bad data
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# Better to be defensive just in case
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if ($outputPort -gt 65535) {
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$outputPort = $outputPort - 65535
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}
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# Why 5000? Because we decided that was a good lower threshold
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if ($outputPort -lt 5000) {
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$outputPort = $outputPort + 5000
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}
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Write-Host "$logLead : Found result port of [$outputPort]"
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return $outputPort
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}
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