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41 lines
1.1 KiB
PowerShell
Executable File
41 lines
1.1 KiB
PowerShell
Executable File
<#
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.SYNOPSIS
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Checks the DNS resolution
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.DESCRIPTION
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This PowerShell script measures the DNS resolution speed by using 200 frequently used domain names.
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.EXAMPLE
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PS> ./check-dns
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.LINK
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https://github.com/fleschutz/PowerShell
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.NOTES
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Author: Markus Fleschutz | License: CC0
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#>
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try {
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"⏳ Step 1/2 - Reading from Data/frequent-domains.csv..."
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$Table = Import-CSV "$PSScriptRoot/../Data/frequent-domains.csv"
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$NumRows = $Table.Length
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"⏳ Step 2/2 - Resolving $NumRows domains..."
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$StopWatch = [system.diagnostics.stopwatch]::startNew()
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if ($IsLinux) {
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foreach($Row in $Table) { $null = dig $Row.Domain +short }
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} else {
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foreach($Row in $Table) { $null = Resolve-DNSName $Row.Domain }
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}
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[float]$Elapsed = $StopWatch.Elapsed.TotalSeconds
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$Average = [math]::round($NumRows / $Elapsed, 1)
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if ($Average -gt 200.0) { $Rating = "excellent" }
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elseif ($Average -gt 100.0) { $Rating = "quite good" }
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elseif ($Average -gt 10.0) { $Rating = "good" }
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else { $Rating = "poor" }
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"✔️ $Average DNS domain lookups per second - $Rating"
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exit 0 # success
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} catch {
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"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
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exit 1
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}
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