#!/bin/sh
#
# Name:         dyndnsup
# Description:  Auto-update dynamic dns service
# Version:      1.0
# Author:       Jose V Beneyto, <joberui@eui.upv.es>
# Depends on:   netcat

# checkdepends: check dependecies
checkdepends() {
        for dep in netcat
        do
                which $dep >& /dev/null
                if [ $? == 1 ]
                then
                        echo "$dep not found, please install it!" >&2
                        exit 1
                fi
        done
}
# readconfig:
readconfig() {
        if [ -f $CONFIG_FILE ]
        then
                . $CONFIG_FILE
                [ "$DYNDNS_SERVER" == "" ] && { echo "DYNDNS_SERVER variable not set!"; exit 1 }
                [ "$DYNDNS_PROTOCOL" == "" ] && { echo "DYNDNS_PROTOCOL variable not set!"; exit 1 }
                [ "$DYNDNS_HOSTNAME" == "" ] && { echo "DYNDNS_HOSTNAME variable not set!"; exit 1 }
                [ "$DYNDNS_IF" == "" ] && { echo "DYNDNS_IF variable not set!"; exit 1 }
        fi
}
# checkip:
checkip() {
        current_ip=`ifconfig $DYNDNS_IF | grep 'inet addr' | awk '{print $2}' | sed -e 's/.*://'`
        last_ip=`cat /var/cache/dyndnsup.cache | grep 'ip' | sed 's/ip=//g'`
        # TODO
        # DYNDNS_IP=
}
# chech time:
checktime(){
        # TODO
        # EXPIRED_TIME=
}
# update:
update() {
        DYNDNS_IP=$1
        echo -ne "GET /nic/update?system=$DYNDNS_PROTOCOL&hostname=$DYNDNS_HOSTNAME&myip=$DYNDNS_IP" | netcat -vv $SERVER_DYNDNS 80
}


# config file
# (you can edit this file to overwrite script variables)
CONFIG_FILE="/etc/dyndnsup.conf"

# edit script variables
# (CONFIG_FILE overwrite them)
DYNDNS_SERVER="members.dyndns.org"
DYNDNS_PROTOCOL="dyndns2"
DYNDNS_HOSTNAME="mikeux.dyndns.org"
DYNDNS_IP=""
DYNDNS_IF="eth0"

checkdepends
readconfig
checkip
checktime
update

exit 0

# End of File