MiniLab

1.1.0

Private/ConvertSubnetMask.ps1

                                # Credit: https://github.com/BornToBeRoot/PowerShell/blob/master/Module/LazyAdmin/Functions/Network/Convert-Subnetmask.ps1

function ConvertSubnetmask

{

    [CmdLetBinding(DefaultParameterSetName='CIDR')]

    param( 

        [Parameter( 

            ParameterSetName='CIDR',       

            Position=0,

            Mandatory=$true,

            HelpMessage='CIDR like /24 without "/"')]

        [ValidateRange(0,32)]

        [Int32]$CIDR,

        [Parameter(

            ParameterSetName='Mask',

            Position=0,

            Mandatory=$true,

            HelpMessage='Subnetmask like 255.255.255.0')]

        [ValidateScript({

            if($_ -match "^(254|252|248|240|224|192|128).0.0.0$|^255.(254|252|248|240|224|192|128|0).0.0$|^255.255.(254|252|248|240|224|192|128|0).0$|^255.255.255.(255|254|252|248|240|224|192|128|0)$")

            {

                return $true

            }

            else 

            {

                throw "Enter a valid subnetmask (like 255.255.255.0)!"    

            }

        })]

        [String]$Mask

    )

    Begin {

    }

    Process {

        switch($PSCmdlet.ParameterSetName)

        {

            "CIDR" {                          

                # Make a string of bits (24 to 11111111111111111111111100000000)

                $CIDR_Bits = ('1' * $CIDR).PadRight(32, "0")

                # Split into groups of 8 bits, convert to Ints, join up into a string

                $Octets = $CIDR_Bits -split '(.{8})' -ne ''

                $Mask = ($Octets | ForEach-Object -Process {[Convert]::ToInt32($_, 2) }) -join '.'

            }

            "Mask" {

                # Convert the numbers into 8 bit blocks, join them all together, count the 1

                $Octets = $Mask.ToString().Split(".") | ForEach-Object -Process {[Convert]::ToString($_, 2)}

                $CIDR_Bits = ($Octets -join "").TrimEnd("0")

                # Count the "1" (111111111111111111111111 --> /24)                     

                $CIDR = $CIDR_Bits.Length             

            }               

        }

        [pscustomobject] @{

            Mask = $Mask

            CIDR = $CIDR

        }

    }

    End {

    }

}

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