#!/bin/sh

###
 #
 # FreeWLAN Addons - http://www.freewlan.info
 #
 # 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 2
 # 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, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 # MA  02110-1301, USA
 #
 # http://www.gnu.org/copyleft/gpl.html
 #
###

. /etc/functions.sh

config_load opendns
config_get enable opendns enable
config_get user opendns user
config_get pass opendns pass
config_get label opendns label

if enabled $enable && [ ! -f /tmp/opendns.lock ]
then
	if [ ! -f /tmp/ip_opendns.cache ]
	then
		echo '0.0.0.0'>/tmp/ip_opendns.cache
	fi
	
	# checking for online connection
	ip_now=`wget -O - http://myip.dnsomatic.com 2> /dev/null`
	if [ "$ip_now" = "" ]
	then
		exit 1
	fi
	
	date=`date +"%s"`
	date_last=`date -r /tmp/ip_opendns.cache +"%s"`
	if [ `expr $date - $date_last` -lt 2505600 ]
	then
		ip_old=$(cat /tmp/ip_opendns.cache)
		if [ "$ip_old" = "$ip_now" ]
		then
			exit 0 # IP not changed and 29 days havn't passed
		fi
	fi
	return="$(wget -q --no-check-certificate -O -  https://$user:$pass@updates.opendns.com/nic/update\?hostname=$label 2>/dev/null | awk '{print $1}')"
	if [ "$return" = "good" ] || [ "$return" = "nochg" ]
	then
		echo "$ip_now">/tmp/ip_opendns.cache
		exit 0
	else
		rm -f /tmp/ip_opendns.cache
		if [ "$return" != "" ]
		then
			touch /tmp/opendns.lock
		fi
		exit 1
	fi
else
	exit 0
fi