Powershell Script to change the DNS directory

DNS Switcher.ps1

#Functions

function CheckAdminRights() {
    # Check if it has admin rights
    If (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(`
                [Security.Principal.WindowsBuiltInRole] "Administrator")) {
        Write-Warning "You do not have Administrator rights to run this script!`nPlease re-run this script as an Administrator!"
        Pause
        Break
    }
}

function Show-Menu() {
    param (
        [string]$Title = 'DNS Switcher'
    )

    Write-Host "================ $Title ================"
    Write-Host "Which DNS provider do you prefer? (default = CloudFare)"
    Write-Host "1: Press '1' for Google Public DNS."
    Write-Host "2: Press '2' for CloudFare"
    Write-Host "3: Press '3' for Cisco OpenDNS"
    Write-Host "Q: Press 'Q' to quit."


    $optionSelected = Read-Host "Select an option:"

    return $optionSelected
}

function GetDnsIP ($optionSelected) {

    $dnsCloudFare = ("1.1.1.1", "1.0.0.1")
    $dnsGoogle = ("8.8.8.8", "8.8.4.4")
    $dnsCisco = ("208.67.222.222", "208.67.220.220")

    switch ($optionSelected) {
        '1' {
            $dns = $dnsGoogle
            Write-Host 'Switching to Google DNS '
        } '2' {
            $dns = $dnsCloudFare
            Write-Host 'Switching to Cloudfare DNS '

        }'3' {
            $dns = $dnsCisco
            Write-Host 'Switching to Cisco OpenDNS '

        } 'q' {
            Write-Host 'Exiting the application'
            return
        }
        default {
            $dns = $dnsCloudFare
            Write-Host 'Switching to Cloudfare DNS '

        }
    }

    return $dns
}


CheckAdminRights

$optionSelected = Show-Menu

$dns = GetDnsIP $optionSelected


$ipConfig = Get-NetIPConfiguration

Write-Host("Switching " + $ipConfig.InterfaceAlias)

Set-DnsClientServerAddress -InterfaceAlias $ipConfig.InterfaceAlias -ServerAddresses $dns

Write-Host "Finished changing the DNS :-) "