--- /dev/null
+#!/bin/sh
+###############################################################################
+# #
+# IPFire.org - A linux based firewall #
+# Copyright (C) 2009 Michael Tremer & Christian Schmidt #
+# #
+# This program is free software: you can redistribute it and/or modify #
+# it under the terms of the GNU General Public License as published by #
+# the Free Software Foundation, either version 3 of the License, or #
+# (at your option) any later version. #
+# #
+# This program is distributed in the hope that it will be useful, #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
+# GNU General Public License for more details. #
+# #
+# You should have received a copy of the GNU General Public License #
+# along with this program. If not, see <http://www.gnu.org/licenses/>. #
+# #
+###############################################################################
+
+. /etc/sysconfig/network
+
+function get_device_by_mac() {
+ local mac=$1
+ for i in /sys/class/net/*; do
+ if [ "$(cat $i/address)" = "$mac" ]; then
+ echo $(basename $i)
+ fi
+ done
+}
+
+function get_mac_by_device() {
+ local device=$1
+ if [ -d "/sys/class/net/$device" ]; then
+ cat /sys/class/net/$device/address
+ return 0
+ fi
+ return 1
+}