Utility.PS

1.0.9

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 IP address exists in the specified subnet.

.INPUTS

    System.Net.IPAddress

#>

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.

        [Parameter(Mandatory = $true)]

        [string[]] $Subnets,

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

        [Parameter(Mandatory = $false)]

        [switch] $ReturnMatchingSubnets

    )

    process {

        foreach ($IpAddress in $IpAddresses) {

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

            [bool] $Result = $false

            foreach ($Subnet in $Subnets) {

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

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

                [int] $bitSubnetAddress = [BitConverter]::ToInt32(([ipaddress]$SubnetComponents[0]).GetAddressBytes(), 0)

                [int] $bitSubnetMaskHostOrder = 0

                if ($SubnetComponents[1] -gt 0) {

                    $bitSubnetMaskHostOrder = -1 -shl (32 - [int]$SubnetComponents[1])

                }

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

                if (($bitIpAddress -band $bitSubnetMask) -eq ($bitSubnetAddress -band $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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# SIG # End signature block