icinga-powershell-plugins

1.6.0

provider/disks/Get-IcingaUNCPathSize.psm1

function Get-IcingaUNCPathSize()
{
    param (
        [string]$Path
    );

    # Lets ensure our path does actually exist
    if ([string]::IsNullOrEmpty($Path) -Or (Test-Path $Path) -eq $FALSE) {
        Exit-IcingaThrowException -ExceptionType 'Configuration' `
            -ExceptionThrown $IcingaExceptions.Configuration.PluginArgumentMissing `
            -CustomMessage 'Plugin argument "-Path" is either empty or does not exist' `
            -Force;
    }

    if ((Test-IcingaAddTypeExist -Type 'IcingaUNCPath') -eq $FALSE) {
        # Register our kernel32.dll Windows API function call
        Add-Type -TypeDefinition @"
            using System;
            using System.Runtime.InteropServices;

            public static class IcingaUNCPath {
                [DllImport("kernel32.dll", PreserveSig = true, CharSet = CharSet.Auto)]

                public static extern int GetDiskFreeSpaceEx(
                    IntPtr lpDirectoryName, // UNC Path for share
                    out long lpFreeBytesAvailable, // Free Bytes available on path
                    out long lpTotalNumberOfBytes, // Bytes available on target disk / path
                    out long lpTotalNumberOfFreeBytes // Total available space on target disk / path
                );
            }
"@
    }

    # Setup variables as object which we can use to reference data into
    $ShareFree = New-Object -TypeName long;
    $ShareSize = New-Object -TypeName long;
    $TotalFree = New-Object -TypeName long;

    # Create a pointer object to our share
    [System.IntPtr]$ptrPath = [System.Runtime.InteropServices.Marshal]::StringToHGlobalAuto($Path);

    # Call our function we registered within the Add-Type definition
    [IcingaUNCPath]::GetDiskFreeSpaceEx($ptrPath, [ref]$ShareFree, [ref]$ShareSize, [ref]$TotalFree) | Out-Null;
    $ShareFreePercent = 0;

    if ($ShareSize -ne 0) {
        $ShareFreePercent = ([math]::round(($ShareFree / $ShareSize * 100), 2));
    }

    return @{
        'ShareFree'        = $ShareFree;
        'ShareSize'        = $ShareSize;
        'ShareFreePercent' = $ShareFreePercent;
        'TotalFree'        = $TotalFree;
    };
}