PowerShell скрипт Get-UserSession

PowerShell скрипт Get-UserSession

function  {
<#
.SYNOPSIS
Retrieves all user sessions from local or remote computers(s)

.DESCRIPTION
Retrieves all user sessions from local or remote computer(s).

Note:   Requires query.exe in order to run
Note:   This works against Windows Vista and later systems provided the following registry value is in place
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\AllowRemoteRPC = 1
Note:   If query.exe takes longer than 15 seconds to return, an error is thrown and the next computername is processed.  Suppress this with -erroraction silentlycontinue
Note:   If $sessions is empty, we return a warning saying no users.  Suppress this with -warningaction silentlycontinue

.PARAMETER computername
Name of computer(s) to run session query against

.parameter parseIdleTime
Parse idle time into a timespan object

.parameter timeout
Seconds to wait before ending query.exe process.  Helpful in situations where query.exe hangs due to the state of the remote system.

.FUNCTIONALITY
Computers

.EXAMPLE
Get-usersession -computername «server1″

Query all current user sessions on ‘server1’

.EXAMPLE
Get-UserSession -computername $servers -parseIdleTime | ?{$_.idletime -gt [timespan]»1:00»} | ft -AutoSize

Query all servers in the array $servers, parse idle time, check for idle time greater than 1 hour.

.NOTES
Thanks to Boe Prox for the ideas — http://learn-powershell.net/2010/11/01/quick-hit-find-currently-logged-on-users/

.LINK
http://gallery.technet.microsoft.com/Get-UserSessions-Parse-b4c97837

#>
[cmdletbinding()]
Param(
[Parameter(
Position = 0,
ValueFromPipeline = $True)]
[string[]]$ComputerName = «localhost»,

[switch]$ParseIdleTime,

[validaterange(0,120)]
[int]$Timeout = 15
)
Process
{
ForEach($computer in $ComputerName)
{

#start query.exe using .net and cmd /c.  We do this to avoid cases where query.exe hangs

#build temp file to store results.  Loop until we see the file
Try
{
$Started = Get-Date
$tempFile = [System.IO.Path]::GetTempFileName()

Do{
start-sleep -Milliseconds 300

if( ((Get-Date) — $Started).totalseconds -gt 10)
{
Throw «Timed out waiting for temp file ‘$TempFile'»
}
}
Until(Test-Path -Path $tempfile)
}
Catch
{
Write-Error «Error for ‘$Computer’: $_»
Continue
}

#Record date.  Start process to run query in cmd.  I use starttime independently of process starttime due to a few issues we ran into
$Started = Get-Date
$p = Start-Process -FilePath C:\windows\system32\cmd.exe -ArgumentList «/c query user /server:$computer > $tempfile» -WindowStyle hidden -passthru

#we can’t read in info or else it will freeze.  We cant run waitforexit until we read the standard output, or we run into issues…
#handle timeouts on our own by watching hasexited
$stopprocessing = $false
do
{

#check if process has exited
$hasExited = $p.HasExited

#check if there is still a record of the process
Try
{
$proc = Get-Process -id $p.id -ErrorAction stop
}
Catch
{
$proc = $null
}

#sleep a bit
start-sleep -seconds .5

#If we timed out and the process has not exited, kill the process
if( ( (Get-Date) — $Started ).totalseconds -gt $timeout -and -not $hasExited -and $proc)
{
$p.kill()
$stopprocessing = $true
Remove-Item $tempfile -force
Write-Error «$computer`: Query.exe took longer than $timeout seconds to execute»
}
}
until($hasexited -or $stopProcessing -or -not $proc)

if($stopprocessing)
{
Continue
}

#if we are still processing, read the output!
try
{
$sessions = Get-Content $tempfile -ErrorAction stop
Remove-Item $tempfile -force
}
catch
{
Write-Error «Could not process results for ‘$computer’ in ‘$tempfile’: $_»
continue
}

#handle no results
if($sessions){

1..($sessions.count — 1) | Foreach-Object {

#Start to build the custom object
$temp = «» | Select ComputerName, Username, SessionName, Id, State, IdleTime, LogonTime
$temp.ComputerName = $computer

#The output of query.exe is dynamic.
#strings should be 82 chars by default, but could reach higher depending on idle time.
#we use arrays to handle the latter.

if($sessions[$_].length -gt 5){

#if the length is normal, parse substrings
if($sessions[$_].length -le 82){

$temp.Username = $sessions[$_].Substring(1,22).trim()
$temp.SessionName = $sessions[$_].Substring(23,19).trim()
$temp.Id = $sessions[$_].Substring(42,4).trim()
$temp.State = $sessions[$_].Substring(46,8).trim()
$temp.IdleTime = $sessions[$_].Substring(54,11).trim()
$logonTimeLength = $sessions[$_].length — 65
try{
$temp.LogonTime = Get-Date $sessions[$_].Substring(65,$logonTimeLength).trim() -ErrorAction stop
}
catch{
#Cleaning up code, investigate reason behind this.  Long way of saying $null….
$temp.LogonTime = $sessions[$_].Substring(65,$logonTimeLength).trim() | Out-Null
}

}

#Otherwise, create array and parse
else{
$array = $sessions[$_] -replace «\s+», » » -split » »
$temp.Username = $array[1]

#in some cases the array will be missing the session name.  array indices change
if($array.count -lt 9){
$temp.SessionName = «»
$temp.Id = $array[2]
$temp.State = $array[3]
$temp.IdleTime = $array[4]
try
{
$temp.LogonTime = Get-Date $($array[5] + » » + $array[6] + » » + $array[7]) -ErrorAction stop
}
catch
{
$temp.LogonTime = ($array[5] + » » + $array[6] + » » + $array[7]).trim()
}
}
else{
$temp.SessionName = $array[2]
$temp.Id = $array[3]
$temp.State = $array[4]
$temp.IdleTime = $array[5]
try
{
$temp.LogonTime = Get-Date $($array[6] + » » + $array[7] + » » + $array[8]) -ErrorAction stop
}
catch
{
$temp.LogonTime = ($array[6] + » » + $array[7] + » » + $array[8]).trim()
}
}
}

#if specified, parse idle time to timespan
if($parseIdleTime){
$string = $temp.idletime

#quick function to handle minutes or hours:minutes
function Convert-ShortIdle {
param($string)
if($string -match «\:»){
[timespan]$string
}
else{
New-TimeSpan -Minutes $string
}
}

#to the left of + is days
if($string -match «\+»){
$days = New-TimeSpan -days ($string -split «\+»)[0]
$hourMin = Convert-ShortIdle ($string -split «\+»)[1]
$temp.idletime = $days + $hourMin
}
#. means less than a minute
elseif($string -like «.» -or $string -like «none»){
$temp.idletime = [timespan]»0:00″
}
#hours and minutes
else{
$temp.idletime = Convert-ShortIdle $string
}
}

#Output the result
$temp
}
}
}
else
{
Write-Warning «‘$computer’: No sessions found»
}
}
}
}

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