DSCResources/MSFT_xSQLServerNetwork/MSFT_xSQLServerNetwork.psm1

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Import-Module -Name (Join-Path -Path (Split-Path (Split-Path $PSScriptRoot -Parent) -Parent) `
        -ChildPath 'xSQLServerHelper.psm1') -Force
Import-Module -Name (Join-Path -Path (Split-Path -Path $PSScriptRoot -Parent) `
        -ChildPath 'CommonResourceHelper.psm1')

# Load localized string data
$script:localizedData = Get-LocalizedData -ResourceName 'MSFT_xSQLServerNetwork'

<#
    .SYNOPSIS
    Returns the current state of the SQL Server network properties.
 
    .PARAMETER InstanceName
    The name of the SQL instance to be configured.
 
    .PARAMETER ProtocolName
    The name of network protocol to be configured. Only tcp is currently supported.
#>

function Get-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Collections.Hashtable])]
    param
    (
        [Parameter(Mandatory = $true)]
        [System.String]
        $InstanceName,

        # For now there is only support for the tcp protocol.
        [Parameter(Mandatory = $true)]
        [ValidateSet('Tcp')]
        [System.String]
        $ProtocolName
    )

    try
    {
        $applicationDomainObject = Register-SqlWmiManagement -SQLInstanceName $InstanceName

        $managedComputerObject = New-Object -TypeName Microsoft.SqlServer.Management.Smo.Wmi.ManagedComputer

        Write-Verbose -Message ($script:localizedData.GetNetworkProtocol -f $ProtocolName, $InstanceName)
        $tcp = $managedComputerObject.ServerInstances[$InstanceName].ServerProtocols[$ProtocolName]

        Write-Verbose -Message $script:localizedData.ReadingNetworkProperties
        $returnValue = @{
            InstanceName = $InstanceName
            ProtocolName    = $ProtocolName
            IsEnabled       = $tcp.IsEnabled
            TcpDynamicPort  = ($tcp.IPAddresses['IPAll'].IPAddressProperties['TcpDynamicPorts'].Value -ge 0)
            TcpPort         = $tcp.IPAddresses['IPAll'].IPAddressProperties['TcpPort'].Value
        }

        $returnValue.Keys | ForEach-Object {
            Write-Verbose -Message "$_ = $($returnValue[$_])"
        }
    }
    finally
    {
        Unregister-SqlAssemblies -ApplicationDomain $applicationDomainObject
    }

    return $returnValue
}

<#
    .SYNOPSIS
    Sets the SQL Server network properties.
 
    .PARAMETER SQLServer
    The host name of the SQL Server to be configured. Default value is $env:COMPUTERNAME.
 
    .PARAMETER InstanceName
    The name of the SQL instance to be configured.
 
    .PARAMETER ProtocolName
    The name of network protocol to be configured. Only tcp is currently supported.
 
    .PARAMETER IsEnabled
    Enables or disables the network protocol.
 
    .PARAMETER TcpDynamicPort
    Specifies whether the SQL Server instance should use a dynamic port.
    Value cannot be set to $true if TcpPort is set to a non-empty string.
 
    .PARAMETER TcpPort
    The TCP port(s) that SQL Server should be listening on.
    If the IP address should listen on more than one port, list all ports
    separated with a comma ('1433,1500,1501'). To use this parameter set
    TcpDynamicPort to 'False'.
 
    .PARAMETER RestartService
    If set to $true then SQL Server and dependent services will be restarted
    if a change to the configuration is made. The default value is $false.
 
    .PARAMETER RestartTimeout
    Timeout value for restarting the SQL Server services. The default value
    is 120 seconds.
#>

function Set-TargetResource
{
    [CmdletBinding()]
    param
    (
        [Parameter()]
        [ValidateNotNullOrEmpty()]
        [System.String]
        $SQLServer = $env:COMPUTERNAME,

        [Parameter(Mandatory = $true)]
        [System.String]
        $InstanceName,

        [Parameter(Mandatory = $true)]
        [ValidateSet('Tcp')]
        [System.String]
        $ProtocolName,

        [Parameter()]
        [System.Boolean]
        $IsEnabled,

        [Parameter()]
        [System.Boolean]
        $TcpDynamicPort,

        [Parameter()]
        [System.String]
        $TcpPort,

        [Parameter()]
        [System.Boolean]
        $RestartService = $false,

        [Parameter()]
        [System.UInt16]
        $RestartTimeout = 120
    )

    if ($TcpDynamicPort -and $TcpPort)
    {
        $errorMessage = $script:localizedData.ErrorDynamicAndStaticPortSpecified
        New-InvalidOperationException -Message $errorMessage
    }

    $getTargetResourceResult = Get-TargetResource -InstanceName $InstanceName -ProtocolName $ProtocolName

    try
    {
        $applicationDomainObject = Register-SqlWmiManagement -SQLInstanceName $InstanceName

        $desiredState = @{
            InstanceName = $InstanceName
            ProtocolName    = $ProtocolName
            IsEnabled       = $IsEnabled
            TcpDynamicPort  = $TcpDynamicPort
            TcpPort         = $TcpPort
        }

        $isRestartNeeded = $false

        $managedComputerObject = New-Object Microsoft.SqlServer.Management.Smo.Wmi.ManagedComputer

        Write-Verbose -Message ($script:localizedData.GetNetworkProtocol -f $ProtocolName, $InstanceName)
        $tcp = $managedComputerObject.ServerInstances[$InstanceName].ServerProtocols[$ProtocolName]

        Write-Verbose -Message ($script:localizedData.CheckingProperty -f 'IsEnabled')
        if ($desiredState.IsEnabled -ine $getTargetResourceResult.IsEnabled)
        {
            Write-Verbose -Message ($script:localizedData.UpdatingProperty -f 'IsEnabled', $getTargetResourceResult.IsEnabled, $desiredState.IsEnabled)
            $tcp.IsEnabled = $desiredState.IsEnabled
            $tcp.Alter()

            $isRestartNeeded = $true
        }

        Write-Verbose -Message ($script:localizedData.CheckingProperty -f 'TcpDynamicPort')
        if ($desiredState.TcpDynamicPort -ne $getTargetResourceResult.TcpDynamicPort)
        {
            # Translates the current and desired state to a string for display
            $dynamicPortDisplayValueTable = @{
                $true = 'enabled'
                $false = 'disabled'
            }

            # Translates the desired state to a valid value
            $desiredDynamicPortValue = @{
                $true = '0'
                $false = ''
            }

            $fromTcpDynamicPortDisplayValue = $dynamicPortDisplayValueTable[$getTargetResourceResult.TcpDynamicPort]
            $toTcpDynamicPortDisplayValue = $dynamicPortDisplayValueTable[$desiredState.TcpDynamicPort]

            Write-Verbose -Message ($script:localizedData.UpdatingProperty -f 'TcpDynamicPorts', $fromTcpDynamicPortDisplayValue, $toTcpDynamicPortDisplayValue)
            $tcp.IPAddresses['IPAll'].IPAddressProperties['TcpDynamicPorts'].Value = $desiredDynamicPortValue[$desiredState.TcpDynamicPort]
            $tcp.Alter()

            $isRestartNeeded = $true
        }

        Write-Verbose -Message ($script:localizedData.CheckingProperty -f 'TcpPort')
        if ($desiredState.TcpPort -ine $getTargetResourceResult.TcpPort)
        {
            $fromTcpPort = $getTargetResourceResult.TcpPort
            if ($fromTcpPort -eq '')
            {
                $fromTcpPort = 'none'
            }

            $toTcpPort = $desiredState.TcpPort
            if ($toTcpPort -eq '')
            {
                $toTcpPort = 'none'
            }

            Write-Verbose -Message ($script:localizedData.UpdatingProperty -f 'TcpPort', $fromTcpPort, $toTcpPort)
            $tcp.IPAddresses['IPAll'].IPAddressProperties['TcpPort'].Value = $desiredState.TcpPort
            $tcp.Alter()

            $isRestartNeeded = $true
        }

        if ($RestartService -and $isRestartNeeded)
        {
            Restart-SqlService -SQLServer $SQLServer -SQLInstanceName $InstanceName -Timeout $RestartTimeout
        }
    }
    finally
    {
        Unregister-SqlAssemblies -ApplicationDomain $applicationDomainObject
    }
}

<#
    .SYNOPSIS
    Sets the SQL Server network properties.
 
    .PARAMETER SQLServer
    The host name of the SQL Server to be configured. Default value is $env:COMPUTERNAME.
 
    Not used in Test-TargetResource.
 
    .PARAMETER InstanceName
    The name of the SQL instance to be configured.
 
    .PARAMETER ProtocolName
    The name of network protocol to be configured. Only tcp is currently supported.
 
    .PARAMETER IsEnabled
    Enables or disables the network protocol.
 
    .PARAMETER TcpDynamicPort
    Specifies whether the SQL Server instance should use a dynamic port.
    Value cannot be set to $true if TcpPort is set to a non-empty string.
 
    .PARAMETER TcpPort
    The TCP port(s) that SQL Server should be listening on.
    If the IP address should listen on more than one port, list all ports
    separated with a comma ('1433,1500,1501'). To use this parameter set
    TcpDynamicPort to 'False'.
 
    .PARAMETER RestartService
    If set to $true then SQL Server and dependent services will be restarted
    if a change to the configuration is made. The default value is $false.
 
    Not used in Test-TargetResource.
 
    .PARAMETER RestartTimeout
    Timeout value for restarting the SQL Server services. The default value
    is 120 seconds.
 
    Not used in Test-TargetResource.
#>

function Test-TargetResource
{
    [CmdletBinding()]
    [OutputType([System.Boolean])]
    param(
        [Parameter()]
        [ValidateNotNullOrEmpty()]
        [System.String]
        $SQLServer = $env:COMPUTERNAME,

        [Parameter(Mandatory = $true)]
        [System.String]
        $InstanceName,

        [Parameter(Mandatory = $true)]
        [ValidateSet('Tcp')]
        [System.String]
        $ProtocolName,

        [Parameter()]
        [System.Boolean]
        $IsEnabled,

        [Parameter()]
        [System.Boolean]
        $TcpDynamicPort,

        [Parameter()]
        [System.String]
        $TcpPort,

        [Parameter()]
        [System.Boolean]
        $RestartService = $false,

        [Parameter()]
        [System.UInt16]
        $RestartTimeout = 120
    )

    if ($TcpDynamicPort -and $TcpPort)
    {
        $errorMessage = $script:localizedData.ErrorDynamicAndStaticPortSpecified
        New-InvalidOperationException -Message $errorMessage
    }

    $getTargetResourceResult = Get-TargetResource -InstanceName $InstanceName -ProtocolName $ProtocolName

    Write-Verbose -Message $script:localizedData.CompareStates

    $isInDesiredState = $true

    if ($ProtocolName -ne $getTargetResourceResult.ProtocolName)
    {
        Write-Verbose -Message ($script:localizedData.ExpectedPropertyValue -f 'ProtocolName', $ProtocolName, $getTargetResourceResult.ProtocolName)

        $isInDesiredState = $false
    }

    if ($PSBoundParameters.ContainsKey('IsEnabled'))
    {
        if ($IsEnabled -ne $getTargetResourceResult.IsEnabled)
        {
            $evaluateEnableOrDisable = @{
                $true  = 'enabled'
                $false = 'disabled'
            }

            Write-Verbose -Message ($script:localizedData.ExpectedPropertyValue -f 'IsEnabled', $evaluateEnableOrDisable[$IsEnabled], $evaluateEnableOrDisable[$getTargetResourceResult.IsEnabled])

            $isInDesiredState = $false
        }
    }

    if ($PSBoundParameters.ContainsKey('TcpDynamicPort'))
    {
        if ($TcpDynamicPort -and $getTargetResourceResult.TcpDynamicPort -eq $false)
        {
            Write-Verbose -Message ($script:localizedData.ExpectedPropertyValue -f 'TcpDynamicPort', $TcpDynamicPort, $getTargetResourceResult.TcpDynamicPort)

            $isInDesiredState = $false
        }
    }

    if ($PSBoundParameters.ContainsKey('TcpPort'))
    {
        if ($getTargetResourceResult.TcpPort -eq '')
        {
            Write-Verbose -Message ($script:localizedData.ExpectedPropertyValue -f 'TcpPort', $TcpPort, $getTargetResourceResult.TcpPort)

            $isInDesiredState = $false
        }
        elseif ($TcpPort -ne $getTargetResourceResult.TcpPort)
        {
            Write-Verbose -Message ($script:localizedData.ExpectedPropertyValue -f 'TcpPort', $TcpPort, $getTargetResourceResult.TcpPort)

            $isInDesiredState = $false
        }
    }

    if ($isInDesiredState)
    {
        Write-Verbose -Message ($script:localizedData.InDesiredState)
    }

    return $isInDesiredState
}

Export-ModuleMember -Function *-TargetResource