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@jdhitsolutions
Created May 5, 2017 12:28
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A PowerShell function to enumerate WMI namespaces using the CIM cmdlets
#requires -version 4.0
Function Get-CimNamespace {
[cmdletbinding(DefaultParameterSetName = 'computer')]
Param(
[Parameter(Position=0)]
[ValidateNotNullorEmpty()]
[string]$Namespace = "Root",
[Parameter(ParameterSetName = 'computer')]
[ValidateNotNullorEmpty()]
[string]$Computername = $env:computername,
[Parameter(ParameterSetName = 'computer')]
[PSCredential]$Credential,
[switch]$Recurse,
[Parameter(ParameterSetName = 'session')]
[CimSession]$CimSession
)
Write-Verbose "[$((Get-Date).timeOfDay)] Starting $($myinvocation.MyCommand)"
#private function to do the actual enumeration
Function _EnumNamespace {
[cmdletbinding(DefaultParameterSetName = 'computer')]
Param(
[Parameter(Position=0)]
[ValidateNotNullorEmpty()]
[string]$Namespace = "Root",
[Parameter(ParameterSetName = 'computer')]
[ValidateNotNullorEmpty()]
[string]$Computername = $env:computername,
[Parameter(ParameterSetName = 'computer')]
[PSCredential]$Credential,
[switch]$Recurse,
[Parameter(ParameterSetName = 'session')]
[CimSession]$CimSession
)
Write-Verbose "[$((Get-Date).timeOfDay)] Starting $($myinvocation.MyCommand)"
#define parameter hashtable for Get-CimInstance
$cimInst = @{
Namespace = $Namespace
ClassName = '__Namespace'
}
if ($pscmdlet.ParameterSetName -eq 'computer' -AND $Computername -ne $env:computername) {
Write-Verbose "[$((Get-Date).timeOfDay)] Creating a CIMSession to $Computername"
$cimParams=@{
Erroraction = 'stop'
Computername = $computername
}
if ($Credential) {
Write-Verbose "[$((Get-Date).timeOfDay)] Using alternate credential for $($credential.username)"
$cimParams.Add('Credential',$Credential)
}
#create a CIM Session
Try {
$CimSession = New-CimSession @cimParams
#add to CimInstance hashtable
$cimInst.Add("cimsession",$CimSession)
#save a reference to this session so it can be removed later
$script:cs = $cimSession
}
Catch {
Throw $_
}
}
elseif ($pscmdlet.ParameterSetName -eq 'session') {
Write-Verbose "[$((Get-Date).timeOfDay)] Using CimSession"
$cimInst.Add("cimsession",$CimSession)
#save a reference to this session so it can be removed later
$script:cs = $cimSession
}
Write-Verbose "[$((Get-Date).timeOfDay)] Getting Namespaces"
$nspaces = Get-CimInstance @cimInst
Write-Verbose "[$((Get-Date).timeOfDay)] Found $($nspaces.count) namespaces under $namespace"
if ($nspaces.count -gt 0) {
foreach ($nspace in $nspaces) {
Write-Verbose "[$((Get-Date).timeOfDay)] Processing $($nspace.name)"
$child = Join-Path -Path $Namespace -ChildPath $nspace.Name
[pscustomobject]@{
Computername = $nspace.cimsystemproperties.servername
Namespace = $child
}
if ($recurse -and $CimSession) {
Write-Verbose "[$((Get-Date).timeOfDay)] Recursing and re-using cimsession"
_EnumNamespace -namespace $child -Recurse -CimSession $cimSession
}
elseif ($recurse) {
Write-Verbose "[$((Get-Date).timeOfDay)] Recursing"
_EnumNamespace -namespace $child -Recurse
}
} #foreach
} #if
Write-Verbose "[$((Get-Date).timeOfDay)] Ending $($myinvocation.MyCommand)"
} #close _EnumNamespace function
#initiate the process
_EnumNamespace @PSBoundParameters
#clean-up
if ($script:cs) {
Write-Verbose "[$((Get-Date).timeOfDay)] Removing CIMSession"
$script:cs | Remove-CimSession
}
Write-Verbose "[$((Get-Date).timeOfDay)] Ending $($myinvocation.MyCommand)"
} #close main function
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