Public/ConvertFrom-InverseAddress.ps1
|
<# .SYNOPSIS Converts an Inverse Address to either an IPv4 Address or Subnet in CIDR address format. .DESCRIPTION Converts an Inverse Address to either an IPv4 Address or Subnet in CIDR address format. .PARAMETER InverseAddress The Inverse Address to convert to IPv4 Address or CIDR format. .EXAMPLE ConvertFrom-InverseAddress -InverseAddress '12.0.12.10.in-addr.arpa' 10.12.0.12 .EXAMPLE ConvertFrom-InverseAddress -InverseAddress '0.12.10.in-addr.arpa' 10.12.0.0/24 .NOTES .LINK http://www.github.com/roberttoups/IPv4Toolbox #> function ConvertFrom-InverseAddress { [CmdletBinding()] param ( # The Inverse Address to convert to IPv4 Address or CIDR format. [Parameter( Position = 0, Mandatory = $true, ValueFromPipeline = $true, HelpMessage = 'The Inverse Address to convert to IPv4 Address or CIDR format.', ParameterSetName = 'InverseAddress' )] [ValidateScript( { if($_ -match '^(.*?)\.(.*?)\.(.*?)\.(.*?)\.in-addr\.arpa') { $true } elseif($_ -match '^(.*?)\.(.*?)\.(.*?)\.in-addr\.arpa') { $true } elseif($_ -match '^(.*?)\.(.*?)\.in-addr\.arpa') { $true } elseif($_ -match '^(.*?)\.in-addr\.arpa') { $true } else { $false } } ) ] [String] $InverseAddress ) begin { } process { Write-Verbose -Message "Converting Inverse Address: $InverseAddress" if($InverseAddress -match '^(.*?)\.(.*?)\.(.*?)\.(.*?)\.in-addr\.arpa') { Write-Verbose -Message "Inverse Address is in IPv4 format" $IPv4Address = $InverseAddress.Replace('.in-addr.arpa', '') [System.Collections.ArrayList]$IPv4ElementList = $IPv4Address.Split('.') $IPv4ElementList.Reverse() | Out-Null $Output = $($IPv4ElementList -join '.') } elseif($InverseAddress -match '^(.*?)\.(.*?)\.(.*?)\.in-addr\.arpa') { Write-Verbose -Message "Inverse Address is a /24 Subnet" $IPv4Address = $InverseAddress.Replace('.in-addr.arpa', '') [System.Collections.ArrayList]$IPv4ElementList = $IPv4Address.Split('.') $IPv4ElementList.Reverse() | Out-Null $Output = "$($IPv4ElementList -join '.').0/24" } elseif($InverseAddress -match '^(.*?)\.(.*?)\.in-addr\.arpa') { Write-Verbose -Message "Inverse Address is a /16 Subnet" $IPv4Address = $InverseAddress.Replace('.in-addr.arpa', '') [System.Collections.ArrayList]$IPv4ElementList = $IPv4Address.Split('.') $IPv4ElementList.Reverse() | Out-Null $Output = "$($IPv4ElementList -join '.').0.0/16" } elseif($InverseAddress -match '^(.*?)\.in-addr\.arpa') { Write-Verbose -Message "Inverse Address is a /8 Subnet" $IPv4Address = $InverseAddress.Replace('.in-addr.arpa', '') [System.Collections.ArrayList]$IPv4ElementList = $IPv4Address.Split('.') $IPv4ElementList.Reverse() | Out-Null $Output = "$($IPv4ElementList -join '.').0.0.0/8" } else { Write-Verbose -Message "Inverse Address is not in proper format. Who did we get here?" $Output = $null } $Output } end { } } |