Modules/NetworkingDsc.Common/NetworkingDsc.Common.psm1
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# Import the Networking Resource Helper Module Import-Module -Name (Join-Path -Path (Split-Path -Path $PSScriptRoot -Parent) ` -ChildPath (Join-Path -Path 'NetworkingDsc.ResourceHelper' ` -ChildPath 'NetworkingDsc.ResourceHelper.psm1')) # Import Localization Strings $script:localizedData = Get-LocalizedData ` -ResourceName 'NetworkingDsc.Common' ` -ResourcePath $PSScriptRoot <# .SYNOPSIS Converts any IP Addresses containing CIDR notation filters in an array to use Subnet Mask notation. .PARAMETER Address The array of addresses to that need to be converted. #> function Convert-CIDRToSubhetMask { [CmdletBinding()] [OutputType([ Microsoft.Management.Infrastructure.CimInstance])] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [String[]] $Address ) $Results = @() foreach ($Entry in $Address) { if (-not $Entry.Contains(':') -and -not $Entry.Contains('-')) { $EntrySplit = $Entry -split '/' if (-not [String]::IsNullOrEmpty($EntrySplit[1])) { # There was a / so this contains a Subnet Mask or CIDR $Prefix = $EntrySplit[0] $Postfix = $EntrySplit[1] if ($Postfix -match '^[0-9]*$') { # The postfix contains CIDR notation so convert this to Subnet Mask $Cidr = [Int] $Postfix $SubnetMaskInt64 = ([convert]::ToInt64(('1' * $Cidr + '0' * (32 - $Cidr)), 2)) $SubnetMask = @( ([math]::Truncate($SubnetMaskInt64 / 16777216)) ([math]::Truncate(($SubnetMaskInt64 % 16777216) / 65536)) ([math]::Truncate(($SubnetMaskInt64 % 65536)/256)) ([math]::Truncate($SubnetMaskInt64 % 256)) ) } else { $SubnetMask = $Postfix -split '\.' } # Apply the Subnet Mast to the IP Address so that we end up with a correctly # masked IP Address that will match what the Firewall rule returns. $MaskedIp = $Prefix -split '\.' for ([int] $Octet = 0; $Octet -lt 4; $Octet++) { $MaskedIp[$Octet] = $MaskedIp[$Octet] -band $SubnetMask[$Octet] } $Entry = '{0}/{1}' -f ($MaskedIp -join '.'),($SubnetMask -join '.') } } $Results += $Entry } return $Results } Export-ModuleMember -Function ` Convert-CIDRToSubhetMask |