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Update list-dns-servers.ps1

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Markus Fleschutz 2024-03-24 18:13:45 +01:00
parent 85b5d2b84f
commit 4de7ec9831
1 changed files with 10 additions and 10 deletions
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scripts/list-dns-servers.ps1
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@ -2,13 +2,13 @@
.SYNOPSIS
Lists DNS servers
.DESCRIPTION
This PowerShell script measures the latency of public and free DNS servers and lists it.
This PowerShell script list public and free DNS servers together with IPv4 addresses and measured latency.
.EXAMPLE
PS> ./list-dns-servers.ps1
Provider IPv4 Latency
-------- ---- -------
AdGuard DNS (Cyprus) 94.140.14.14 / 94.140.15.15 222 / 205 ms
DNS PROVIDER IPv4 ADDRESSES LATENCY
------------ ---- --------- -------
AdGuard DNS (Cyprus) 94.140.14.14 · 94.140.15.15 222 · 205 ms
...
.LINK
https://github.com/fleschutz/PowerShell
@ -16,24 +16,24 @@
Author: Markus Fleschutz | License: CC0
#>
function CheckDNSServer { param($Provider, $IPv4Pri, $IPv4Sec)
$SW=[system.diagnostics.stopwatch]::startNew();$null=(nslookup fleschutz.de $IPv4Pri 2>$null);[int]$Lat1=$SW.Elapsed.TotalMilliseconds
function MeasureDNSServer([string]$provider, [string]$IPv4Pri, [string]$IPv4Sec) {
$time=[system.diagnostics.stopwatch]::startNew();$null=(nslookup fleschutz.de $IPv4Pri 2>$null);[int]$lat1=$time.Elapsed.TotalMilliseconds
$SW=[system.diagnostics.stopwatch]::startNew();$null=(nslookup fleschutz.de $IPv4Sec 2>$null);[int]$Lat2=$SW.Elapsed.TotalMilliseconds
$time=[system.diagnostics.stopwatch]::startNew();$null=(nslookup fleschutz.de $IPv4Sec 2>$null);[int]$lat2=$time.Elapsed.TotalMilliseconds
New-Object PSObject -Property @{ Provider=$Provider; IPv4="$IPv4Pri / $IPv4Sec"; Latency="$Lat1 / $Lat2 ms" }
New-Object PSObject -Property @{ 'DNS PROVIDER'=$provider; 'IPv4 ADDRESSES'="$IPv4Pri · $IPv4Sec"; LATENCY="$lat1 · $lat2 ms" }
}
function List-DNS-Servers {
Write-Progress "Loading data/public-dns-servers.csv..."
$table = Import-CSV "$PSScriptRoot/../data/public-dns-servers.csv"
Write-Progress -completed "Done."
foreach($row in $table) { CheckDNSServer $row.PROVIDER $row.IPv4_PRI $row.IPv4_SEC }
foreach($row in $table) { MeasureDNSServer $row.PROVIDER $row.IPv4_PRI $row.IPv4_SEC }
}
try {
List-DNS-Servers | Format-Table -property @{e='Provider';width=50},@{e='IPv4';width=32},@{e='Latency';width=15}
List-DNS-Servers | Format-Table -property @{e='DNS PROVIDER';width=50},@{e='IPv4 ADDRESSES';width=32},@{e='LATENCY';width=15}
exit 0 # success
} catch {
"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"