# This Perl code finds the users that have not logged in over a period of time

# ---------------------------------------------------------------
# From the book "Active Directory Cookbook" by Robbie Allen
# ISBN: 0-596-00466-4
# ---------------------------------------------------------------

# ------ SCRIPT CONFIGURATION ------
# Domain and container/OU to check for inactive accounts
my $domain   = '<DomainDNSName>';  # e.g. amer.rallencorp.com
my $cont     = 'cn=Users'; # set to empty string to query entire domain
                           # Or set to a relative path in the domain:
                           #    e.g. cn=Users
# Number of weeks a user needs to be inactive to be returned
my $weeks_ago = <NumWeeks>;  # e.g. 4
# ------ END CONFIGURATION ---------

use strict;
use Win32::OLE;
$Win32::OLE::Warn = 3;
   $Win32::OLE::Warn = 3;
use Math::BigInt;

# Need to convert the number of seconds since $weeks_ago
# to a large integer for comparison against lastLogonTimestamp
my $past_secs = time - 60*60*24*7*$weeks_ago;
my $intObj = Math::BigInt->new($past_secs);
   $intObj = Math::BigInt->new($intObj->bmul('10 000 000'));
my $past_largeint = Math::BigInt->new(
                      $intObj->badd('116 444 736 000 000 000'));
   $past_largeint =~ s/^[+-]//;

# Setup the ADO connections
my $connObj                         = Win32::OLE->new('ADODB.Connection');
$connObj->{Provider}                = "ADsDSOObject";
# Set these next two if you need to authenticate
# $connObj->Properties->{'User ID'}   = '<UserUPNOrDN>'; 
# $connObj->Properties->{'Password'}  = '<Password>';
$connObj->Open;
my $commObj                         = Win32::OLE->new('ADODB.Command');
$commObj->{ActiveConnection}        = $connObj;
$commObj->Properties->{'Page Size'} = 1000;

# Grab the default domain name
my $rootDSE = Win32::OLE->GetObject("LDAP://$domain/RootDSE");
my $rootNC = $rootDSE->Get("defaultNamingContext");

# Run ADO query and print results
$cont .= "," if $cont and not $cont =~ /,$/;
my $query  = "<LDAP://$domain/$cont$rootNC>;";
$query .=  "(&(objectclass=user)";
$query .=    "(objectcategory=Person)";
$query .=    "(!useraccountcontrol:1.2.840.113556.1.4.803:=2)";
$query .=    "(lastlogontimestamp<=$past_largeint));";
$query .=  "cn,distinguishedName;";
$query .= "subtree";
$commObj->{CommandText} = $query;
my $resObj = $commObj->Execute($query);
die "Could not query $domain: ",$Win32::OLE::LastError,"\n" 
   unless ref $resObj;

print "\nUsers that have been inactive for $weeks_ago weeks or more:\n";
my $total = 0;
while (!($resObj->EOF)) {
   my $cn  = $resObj->Fields(0)->value;
   print "\t",$resObj->Fields("distinguishedName")->value,"\n";
   $total++;
   $resObj->MoveNext;
}
print "Total: $total\n";