snippets/bash/boot
2012-08-15 13:56:47 +02:00

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#!/bin/bash
##
# Send wake on lan packages to the LAN network
#
# includes MAC lookup via DNS and ARP
#
# @copyright 2012 Steffen Vogel
# @license http://www.gnu.org/licenses/gpl.txt GNU Public License
# @author Steffen Vogel <info@steffenvogel.de>
# @link http://www.steffenvogel.de/
##
##
# This script 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
# any later version.
#
# This script 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 script. If not, see <http://www.gnu.org/licenses/>.
##
IP_REGEX="[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}"
E_BADARGS=65
if [[ ! -n "$1" ]]; then
echo "Usage: $(basename $0) HOST"
exit $E_BADARGS
fi
if [[ $1 =~ ${IP_REGEX} ]]; then
IP=$1
else
IP=$(dig +short $1 | head -n1)
if [[ -z ${IP} ]]; then
echo "failed to lookup ip"
exit 4
else
echo "$1 has ip: ${IP}"
fi
fi
# do a ping to trigger ARP request
ping -c1 -q ${IP} &>/dev/null
if [[ $? -eq 0 ]]; then
echo "host is alive!"
# exit 2
fi
MAC=$(grep "^${IP}\ " /proc/net/arp | awk '{print $4}')
if [[ -z ${MAC} ]]; then
echo "no mac found!"
exit 1
fi
echo "$1 has mac: ${MAC}"
if [[ $(id -un) != "root" ]]; then
echo "$(basename $0) requires root privileges!"
exit 3
fi
etherwake ${MAC}
echo "wol packet has been sent"