MSIdentityTools

2.0.23

internal/Test-IpAddressInSubnet.ps1

                                <#

.SYNOPSIS

    Determine if an IP address exists in the specified subnet.

.EXAMPLE

    PS C:\>Test-IpAddressInSubnet 192.168.1.10 -Subnet '192.168.1.1/32','192.168.1.0/24'

    Determine if the IPv4 address exists in the specified subnet.

.EXAMPLE

    PS C:\>Test-IpAddressInSubnet 2001:db8:1234::1 -Subnet '2001:db8:a::123/64','2001:db8:1234::/48'

    Determine if the IPv6 address exists in the specified subnet.

.INPUTS

    System.Net.IPAddress

.LINK

    https://github.com/jasoth/Utility.PS

#>

function Test-IpAddressInSubnet {

    [CmdletBinding()]

    [OutputType([bool], [string[]])]

    param (

        # IP Address to test against provided subnets.

        [Parameter(Mandatory = $true, ValueFromPipeline = $true, Position = 1)]

        [ipaddress[]] $IpAddresses,

        # List of subnets in CIDR notation. For example, "192.168.1.0/24" or "2001:db8:1234::/48".

        [Parameter(Mandatory = $true)]

        [string[]] $Subnets,

        # Return list of matching subnets rather than a boolean result.

        [Parameter(Mandatory = $false)]

        [switch] $ReturnMatchingSubnets

    )

    begin {

        function ConvertBitArrayToByteArray([System.Collections.BitArray] $BitArray) {

            [byte[]] $ByteArray = New-Object byte[] ([System.Math]::Ceiling($BitArray.Length / 8))

            $BitArray.CopyTo($ByteArray, 0)

            return $ByteArray

        }

        function ConvertBitArrayToBigInt([System.Collections.BitArray] $BitArray) {

            return [bigint][byte[]](ConvertBitArrayToByteArray $BitArray)

        }

    }

    process {

        foreach ($IpAddress in $IpAddresses) {

            if ($IpAddress.AddressFamily -eq [System.Net.Sockets.AddressFamily]::InterNetwork) {

                [int32] $bitIpAddress = [BitConverter]::ToInt32($IpAddress.GetAddressBytes(), 0)

            }

            else {

                [System.Collections.BitArray] $bitIpAddress = $IpAddress.GetAddressBytes()

            }

            [System.Collections.Generic.List[string]] $listSubnets = New-Object System.Collections.Generic.List[string]

            [bool] $Result = $false

            foreach ($Subnet in $Subnets) {

                [string[]] $SubnetComponents = $Subnet.Split('/')

                [ipaddress] $SubnetAddress = $SubnetComponents[0]

                [int] $SubnetMaskLength = $SubnetComponents[1]

                if ($IpAddress.AddressFamily -eq $SubnetAddress.AddressFamily) {

                    if ($IpAddress.AddressFamily -eq [System.Net.Sockets.AddressFamily]::InterNetwork) {

                        ## Supports IPv4 (32 bit) only but more performant than BitArray?

                        #[int32] $bitIpAddress = [BitConverter]::ToInt32($IpAddress.GetAddressBytes(), 0)

                        [int32] $bitSubnetAddress = [BitConverter]::ToInt32($SubnetAddress.GetAddressBytes(), 0)

                        [int32] $bitSubnetMaskHostOrder = 0

                        if ($SubnetMaskLength -gt 0) {

                            $bitSubnetMaskHostOrder = -1 -shl (32 - $SubnetMaskLength)

                        }

                        [int32] $bitSubnetMask = [ipaddress]::HostToNetworkOrder($bitSubnetMaskHostOrder)

                        ## Check IP

                        if (($bitIpAddress -band $bitSubnetMask) -eq ($bitSubnetAddress -band $bitSubnetMask)) {

                            if ($ReturnMatchingSubnets) {

                                $listSubnets.Add($Subnet)

                            }

                            else {

                                $Result = $true

                                continue

                            }

                        }

                    }

                    else {

                        ## BitArray supports IPv4 (32 bits) and IPv6 (128 bits). Would Int128 type in .NET 7 improve performance?

                        #[System.Collections.BitArray] $bitIpAddress = $IpAddress.GetAddressBytes()

                        [System.Collections.BitArray] $bitSubnetAddress = $SubnetAddress.GetAddressBytes()

                        [System.Collections.BitArray] $bitSubnetMask = New-Object System.Collections.BitArray -ArgumentList ($bitSubnetAddress.Length - $SubnetMaskLength), $true

                        $bitSubnetMask.Length = $bitSubnetAddress.Length

                        [void]$bitSubnetMask.Not()

                        [byte[]] $ByteArray = ConvertBitArrayToByteArray $bitSubnetMask

                        [array]::Reverse($ByteArray)  # Convert to Network byte order

                        [System.Collections.BitArray] $bitSubnetMask = $ByteArray

                        ## Check IP

                        if ((ConvertBitArrayToBigInt $bitIpAddress.And($bitSubnetMask)) -eq (ConvertBitArrayToBigInt $bitSubnetAddress.And($bitSubnetMask))) {

                            if ($ReturnMatchingSubnets) {

                                $listSubnets.Add($Subnet)

                            }

                            else {

                                $Result = $true

                                continue

                            }

                        }

                    }

                }

            }

            ## Return list of matches or boolean result

            if ($ReturnMatchingSubnets) {

                if ($listSubnets.Count -gt 1) { Write-Output $listSubnets.ToArray() -NoEnumerate }

                elseif ($listSubnets.Count -eq 1) { Write-Output $listSubnets.ToArray() }

                else {

                    $Exception = New-Object ArgumentException -ArgumentList ('The IP address {0} does not belong to any of the provided subnets.' -f $IpAddress)

                    Write-Error -Exception $Exception -Category ([System.Management.Automation.ErrorCategory]::ObjectNotFound) -CategoryActivity $MyInvocation.MyCommand -ErrorId 'TestIpAddressInSubnetNoMatch' -TargetObject $IpAddress

                }

            }

            else {

                Write-Output $Result

            }

        }

    }

}

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