<#
--------------
Disable IPV6 
--------------

AUTHOR: Yotam Krief
MODIFIED BY: Bruno Ramos de Matos
--------------

DESCRIPTION:
This script disables IPV6, made for WSUS server as a prerequisite for JetPatch.

NOTES:
 1. Reboot at end of execution is mandantory in order for changes to take effect.
 2. Reboot will be triggered automatically by the script, if all changes are successful.

PREREQUISITE:
- Powershell 4.0
- Run as administrator

#>

# DECLARED FUNCTIONS
function ExitWithCode {
    param (
        $exitcode
    )
    $host.SetShouldExit($exitcode)
}

# SET VARIABLES
$exitCode = 1
$exitcode_task1 = 1
$exitcode_task2 = 1
$ErrorActionPreference = "Inquire"
$successActionCount = 0
$RegistryPath = 'HKLM:\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters'
$Name         = 'DisabledComponents'
$Value        = '255'

# CHECK AND DISABLE IPV6 ON ALL NETWORK ADAPTERS
Get-NetAdapter | ForEach-Object { Disable-NetAdapterBinding -InterfaceAlias $_.Name -ComponentID ms_tcpip6 }
$adaptersCount = 0
Get-NetAdapter | ForEach-Object {
    $ps=Get-NetAdapterBinding -InterfaceAlias $_.Name -ComponentID ms_tcpip6
    Write-Host Name = $ps.Name
    Write-Host DisplayName = $ps.DisplayName
    Write-Host ComponentID = $ps.ComponentID
    Write-Host Enabled = $ps.Enabled
    Write-Host ''
    $adaptersCount++
    if (!$ps.Enabled) {
        $successActionCount++
    }
}
if ($successActionCount -eq $adaptersCount) {
    $exitcode_task1 = 0
}

# CHECK AND DISABLE IPV6 SUPPORT ON SYSTEM VIA REGISTRY
# Create the key if it does not exist
If (-NOT (Test-Path $RegistryPath)) {
  New-Item -Path $RegistryPath -Force | Out-Null
}  
# Now set the value
Set-ItemProperty -Path $RegistryPath -Name $Name -Value $Value -Type DWORD -Force

# Check if set value is correct
$regproperty = Get-ItemProperty -Path $RegistryPath -Name $Name
 if ($regproperty.DisabledComponents -eq $Value ) {
	 Write-Host "System support for IPv6 was disabled successfully!"
	 Write-Host ''
	 $exitcode_task2 = 0
    }

# CHECK IF BOTH TASKS WERE SUCCESSFUL. IF SO, THEN SET EXIT CODE TO 0 AND CALL FOR REBOOT	
if (($exitcode_task1 -eq 0) -And ($exitcode_task2 -eq 0)) {
    $exitcode = 0
	write-Host "This computer is now going to reboot in order for changes to become fully effective..."
	Write-Host ''
	shutdown -r
}

ExitWithCode $exitCode
exit $exitCode