private/core/Test-DomainResolves.ps1
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function Test-DomainResolves { param ( [Parameter(Mandatory)] [string]$Domain, [int]$TimeoutSeconds = 10 ) try { # Create a script block for DNS resolution $resolveScriptBlock = { param($domainToResolve) try { # Try Resolve-DnsName first (available in PowerShell 7+) $null = Resolve-DnsName -Name $domainToResolve -ErrorAction Stop return $true } catch { try { # Fallback to nslookup if Resolve-DnsName isn't available $nslookupResult = nslookup $domainToResolve 2>&1 return ($LASTEXITCODE -eq 0) } catch { # If both methods fail, return false return $false } } } # Run the resolution with a timeout $job = Start-Job -ScriptBlock $resolveScriptBlock -ArgumentList $Domain # Wait for the job to complete or timeout $completed = Wait-Job -Job $job -Timeout $TimeoutSeconds # If the job completed successfully, get the result if ($completed -and $completed.State -eq 'Completed') { $result = Receive-Job -Job $job Remove-Job -Job $job -Force return $result } else { # Job timed out or failed if ($job.State -ne 'Completed') { Stop-Job -Job $job } Remove-Job -Job $job -Force Write-PSFMessage -Level Verbose -Message "DNS resolution for $Domain timed out after $TimeoutSeconds seconds" return $false } } catch { Write-PSFMessage -Level Warning -Message "Error resolving domain $Domain $_" return $false } } |