httpowershell

0.2.0

Functions/Private/Resolve-GoogleDNS.ps1

function Resolve-GoogleDNS {
    <#
    .SYNOPSIS
    Resolve DNS request from Google's DoH
    .DESCRIPTION
    Make a simple DNS request to Google's DoH server, with optional type
    .NOTES
    Author: S Macleod
    Date: 29/10/25
    .PARAMETER Name
    Hostname to resolve
    .PARAMETER Type
    DNS Type to use
    #>
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory, Position = 0, ValueFromPipeline)]
        [string]
        $Name,

        [Parameter()]
        [string]
        $Type
    )

    Process {
        $Query = "name=$Name"
        if ($Type) {
            $Query += "&type=$Type"
        }
        $RequestParams = @{
            Method = 'GET'
            Uri    = "https://dns.google/resolve?$Query"
        }
        try {
            $Result = Invoke-RestMethod @RequestParams
        }
        catch {
            throw "Resolve-GoogleDNS: DNS lookup failed: $_"
        }

        if ($null -eq $Result.Answer) {
            throw "Resolve-GoogleDNS: Hostname $Hostname does not resolve in DNS."
        }

        return $Result.answer
    }
}