[CmdletBinding()]
Param (
    [Parameter(Mandatory = $False)]
    [string]$InterfaceName,

    [Parameter(Mandatory = $False)]
    [string]$InterfaceIPAddress,

    [Parameter(Mandatory = $False)]
    [switch]$UseBurntToast
)

function Enable-PromiscuousMode {
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory = $True)]
        [string]$InterfaceName,

        [Parameter(Mandatory = $True)]
        [string]$InterfaceIPAddress,

        [Parameter(Mandatory = $False)]
        [switch]$UseBurntToast
    )

    # Validate parameters
    if ($(Get-NetAdapter).Name -notcontains $InterfaceName) {
        Write-Error "'$InterfaceName' is not a valid Network Adapter Interface Name/InterfaceAlias! Halting!"
        $global:FunctionResult = "1"
        return
    }
    if ($(Get-NetIPAddress -InterfaceAlias $InterfaceName -AddressFamily IPv4).IPAddress -notcontains $InterfaceIPAddress) {
        Write-Error "The interface '$Interface' does not have an IP Address of '$InterfaceIPAddress'! Halting!"
        $global:FunctionResult = "1"
        return
    }

    # Make sure Promiscuous Mode isn't already enabled
    if ($(Get-NetAdapter -Name $InterfaceName).PromiscuousMode) {
        Write-Error "Promiscuous Mode is already enabled for the interface '$InterfaceName'! Halting!"
        $global:FunctionResult = "1"
        return
    }

    if ($UseBurntToast -and [Environment]::OSVersion.Version.Major -ge 10) {
        try {
            if (!$(Get-Module -ListAvailable BurntToast)) {Install-Module BurntToast}
            if (!$(Get-Module BurntToast)) {Import-Module BurntToast}
        }
        catch {
            Write-Verbose "Problem with installing the BurntToast Module! Skipping..."
        }
    }

    # Do some funky stuff with byte arrays
    $byteIn = New-Object Byte[] 4
    $byteOut = New-Object Byte[] 4
    $byteData = New-Object Byte[] 4096
    $byteIn[0] = 1
    $byteIn[1-3] = 0
    $byteOut[0-3] = 0

    # Open an IP Socket
    $Socket = New-Object System.Net.Sockets.Socket([Net.Sockets.AddressFamily]::InterNetwork, [Net.Sockets.SocketType]::Raw, [Net.Sockets.ProtocolType]::IP)

    # Include the ip header
    $Socket.SetSocketOption("IP", "HeaderIncluded", $true)

    # Big packet buffer in bytes
    # NOTE: You might need to play with this value if things don't work. Try factors of 1024 (for example, 1024, 8192, 24576, 1024000, etc)
    $Socket.ReceiveBufferSize = 512000

    # Create ip endpoint
    $Endpoint = New-Object System.Net.IPEndpoint([Net.IPAddress]$InterfaceIPAddress, 0)
    $Socket.Bind($Endpoint)

    # Enable promiscuous mode
    [void]$Socket.IOControl([Net.Sockets.IOControlCode]::ReceiveAll, $byteIn, $byteOut)

    # Make sure Promiscuous Mode is on
    if ($(Get-NetAdapter -Name $InterfaceName).PromiscuousMode) {
        if ($UseBurntToast -and [Environment]::OSVersion.Version.Major -ge 10) {
            $NewBTMsgSplatParams = @{
                Text            = @("Promiscuous Mode has been enabled for $InterfaceName $InterfaceIPAddress.","It will remain enabled as long as PowerShell process $PID is running.")
                Button          = New-BTButton -Dismiss
            }
            New-BurntToastNotification @NewBTMsgSplatParams
        }
        $SuccessMsg = "Promiscuous Mode has been enabled for $InterfaceName $InterfaceIPAddress. " +
        "Promiscuous Mode will remain enabled for as long as this PowerShell process (i.e. PID $PID) is running."
        Write-Host $SuccessMsg -ForegroundColor Green
    }
    else {
        Write-Error "Unable to enable Promiscuous Mode for $InterfaceName $InterfaceIPAddress! Halting!"
        $global:FunctionResult = "1"
        return
    }

    $Counter = 0
    while ($True) {
        if ($Counter -eq 0) {
            Write-Host "To turn off Promiscuous Mode for '$InterfaceName', close this PowerShell window, or kill process $PID"
        }
        $Counter++
    }
}


if (!$InterfaceName) {
    $InterfaceName = Read-Host -Prompt "Please enter the name of the Network Interface that you would like to enable Promiscuous Mode for"
}

# Validate parameters
if ($(Get-NetAdapter).Name -notcontains $InterfaceName) {
    Write-Error "'$InterfaceName' is not a valid Network Adapter Interface Name/InterfaceAlias! Halting!"
    $global:FunctionResult = "1"
    return
}

if (!$InterfaceIPAddress) {
    [array]$IPAddressInfo = @($(Get-NetIPAddress -InterfaceAlias $InterfaceName -AddressFamily IPv4).IPAddress)
    if ($IPAddressInfo.Count -gt 1) {
        $InterfaceIPAddress = Read-Host -Prompt "Please enter the IP Address for $InterfaceName that you would like to use. Valid options are $($IPAddressInfo -join ', ')"
    }
    else {
        $InterfaceIPAddress = $IPAddressInfo[0]
    }
}

if ($IPAddressInfo -notcontains $InterfaceIPAddress) {
    Write-Error "The interface '$InterfaceName' does not have an IP Address of '$InterfaceIPAddress'! Halting!"
    $global:FunctionResult = "1"
    return
}

$EnablePromiscuousModeSplatParams = @{
    InterfaceName       = $InterfaceName
    InterfaceIPAddress  = $InterfaceIPAddress
}
if ($UseBurntToast) {
    $EnablePromiscuousModeSplatParams.Add("UseBurntToast",$True)
}
Enable-PromiscuousMode @EnablePromiscuousModeSplatParams
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