DSCResources/MSFT_xDNSServerAddress/MSFT_xDNSServerAddress.psm1
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# xDNSServerAddress : DSC Resource that will set/test/get the current DNS Server # Address, by accepting values among those given in xDNSServerAddress.schema.mof #######################################################################################> ###################################################################################### # The Get-TargetResource cmdlet. # This function will get the present list of DNS ServerAddress DSC Resource schema variables on the system ###################################################################################### function Get-TargetResource { param ( [Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [String[]]$Address, [Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [String]$InterfaceAlias, [ValidateSet("IPv4", "IPv6")] [String]$AddressFamily = "IPv4" ) $returnValue = @{ Address = (Get-DnsClientServerAddress -InterfaceAlias $InterfaceAlias -AddressFamily $AddressFamily).ServerAddresses AddressFamily = $AddressFamily InterfaceAlias = $InterfaceAlias } $returnValue } ###################################################################################### # The Set-TargetResource cmdlet. # This function will set a new Server Address in the current node ###################################################################################### function Set-TargetResource { param ( #IP Address that has to be set [Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [String[]]$Address, [Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [String]$InterfaceAlias, [ValidateSet("IPv4", "IPv6")] [String]$AddressFamily = "IPv4" ) ValidateProperties @PSBoundParameters -Apply } ###################################################################################### # The Test-TargetResource cmdlet. # This will test if the given Server Address is among the current node's Server Address collection ###################################################################################### function Test-TargetResource { param ( [Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [String[]]$Address, [Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [String]$InterfaceAlias, [ValidateSet("IPv4", "IPv6")] [String]$AddressFamily = "IPv4" ) ValidateProperties @PSBoundParameters } ####################################################################################### # Helper function that validates the Server Address properties. If the switch parameter # "Apply" is set, then it will set the properties after a test ####################################################################################### function ValidateProperties { param ( [Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [String[]]$Address, [Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [String]$InterfaceAlias, [ValidateSet("IPv4", "IPv6")] [String]$AddressFamily, [Switch]$Apply ) $sa =$Address $sa | %{ if(!([System.Net.Ipaddress]::TryParse($_, [ref]0))) { throw "Server Address *$_* is not in the correct format. Please correct the Address in the configuration and try again" } if (([System.Net.IPAddress]$_).AddressFamily.ToString() -eq [System.Net.Sockets.AddressFamily]::InterNetwork.ToString()) { if ($AddressFamily -ne "IPv4") { throw "Server address $Address is in IPv4 format, which does not match server address family $AddressFamily. Please correct either of them in the configuration and try again" } } else { if ($AddressFamily -ne "IPv6") { throw "Server address $Address is in IPv6 format, which does not match server address family $AddressFamily. Please correct either of them in the configuration and try again" } } } try { Write-Verbose -Message "Checking the DNS Server Address ..." #Get the current IP Address based on the parameters given. $currentAddress = (Get-DnsClientServerAddress -InterfaceAlias $InterfaceAlias -AddressFamily $AddressFamily -ErrorAction Stop).ServerAddresses #Check if the Server addresses are the same as the desired addresses. if(@(Compare-Object -ReferenceObject $currentAddress -DifferenceObject $Address -SyncWindow 0).Length -gt 0) { Write-Verbose -Message "DNS Servers are not correct. Expected $Address, actual $currentAddress" if($Apply) { # Set the DNS settings as well Set-DnsClientServerAddress -InterfaceAlias $InterfaceAlias -ServerAddresses $Address Write-Verbose -Message "DNS Servers have been set correctly." } else { return $false } } else { #Test will return true in this case Write-Verbose -Message "DNS Servers are set correctly." return $true } } catch { Write-Verbose -Message $_ throw "Can not set or find valid DNS Server addresses using InterfaceAlias $InterfaceAlias and AddressFamily $AddressFamily" } } # FUNCTIONS TO BE EXPORTED Export-ModuleMember -function Get-TargetResource, Set-TargetResource, Test-TargetResource |