#!/usr/bin/perl -w
#
# $Id: lanmac.pl,v 1.4 2005/10/23 22:25:20 jmates Exp $
#
# Copyright (c) 2005, Alex Dioso.
# All rights reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
#####################################################################
#
# Get the MAC Address for the first active connection.

use strict;
use Win32::OLE qw( in );

use constant MACHINE => ".";
use constant NAMESPACE => "root/cimv2";
use constant CLASS => "winmgmts://" . MACHINE . "/" . NAMESPACE;

my $WMI = Win32::OLE->GetObject(CLASS) or die "Failed to get WMI\n";
my $lans = $WMI->ExecQuery("select * from Win32_NetworkAdapterConfiguration where IPEnabled=True") or
    die "Failed to get lan connections\n";

my %lans_hash;
for my $lan (in($lans)) {
  $lans_hash{$lan->{Index}} = $lan->{MACAddress};
}

my @lans_array = sort keys %lans_hash;
@lans_array ge 1 or die "No active connections\n";
my $mac = $lans_hash{$lans_array[0]};
$mac =~ s/://g;
print lc $mac;