+#!/bin/bash
+###############################################################################
+# #
+# IPFire.org - A linux based firewall #
+# Copyright (C) 2014 IPFire Team <info@ipfire.org> #
+# #
+# 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/>. #
+# #
+###############################################################################
+
+function list_interfaces() {
+ local interface
+
+ for interface in /sys/class/net/*; do
+ [ -d "${interface}" ] || continue
+
+ interface="$(basename ${interface})"
+ case "${interface}" in
+ eth*)
+ echo "${interface}"
+ ;;
+ esac
+ done
+}
+
+function try_dhcp() {
+ local interface="${1}"
+
+ # Bring up the interface
+ ip link set "${interface}" up
+
+ # Try to make the lights of the adapter light up
+ ethtool -i "${interface}" &>/dev/null
+
+ # Start the DHCP client
+ dhcpcd "${interface}"
+}
+
+function main() {
+ local interface
+ for interface in $(list_interfaces); do
+ if ! try_dhcp "${interface}"; then
+ echo "Could not acquire an IP address on ${interface}"
+ continue
+ fi
+
+ echo "Successfully started on ${interface}"
+ return 0
+ done
+
+ return 1
+}
+
+main