private/helper/dns/Get-DnsDkimRecord.ps1
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function Get-DnsDkimRecord { <# .SYNOPSIS Get DKIM record for domain. .DESCRIPTION Uses Google API to resolve DNS. Returns selector1 and selector2 if they exists. .PARAMETER Domain Domain to resolve. .EXAMPLE # Get DKIM record for domain. Get-DnsDkimRecord -Domain 'example.com'; #> [cmdletbinding()] param ( # Domain to lookup. [Parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true)] [ValidateNotNullOrEmpty()] [string]$Domain ) BEGIN { # Object array to store SPF records. $dkimRecords = New-Object System.Collections.ArrayList; # Construct selectors. $selector1 = 'selector1._domainkey'; $selector2 = 'selector2._domainkey'; # Construct DKIM record. $dkimRecord1 = ('{0}.{1}' -f $selector1, $Domain); $dkimRecord2 = ('{0}.{1}' -f $selector2, $Domain); } PROCESS { # Try to get DKIM records. try { # Invoke DNS requests. $dkimRecord1Result = Invoke-DnsRequest -Domain $dkimRecord1 -Type 'CNAME' -ErrorAction SilentlyContinue; $dkimRecord2Result = Invoke-DnsRequest -Domain $dkimRecord2 -Type 'CNAME' -ErrorAction SilentlyContinue; # Add DKIM records to array. $dkimRecords += $dkimRecord1Result; $dkimRecords += $dkimRecord2Result; } catch { # Write to log. Write-Log -Category 'DNS' -Subcategory 'DKIM' -Message ("DKIM data for '{0}' is '{1}'" -f $dkimRecord1, $dkimRecord1Result.data) -Level Debug; Write-Log -Category 'DNS' -Subcategory 'DKIM' -Message ("DKIM data for '{0}' is '{1}'" -f $dkimRecord2, $dkimRecord2Result.data) -Level Debug; } } END { # Return SPF records if any. if($null -ne $dkimRecords) { return $dkimRecords; } } } |