#!/bin/bash

NAME=ipv6daemon
PIDFILE=$NAME.pid
INT_WAN=ppp0
WAN_IP=$(ip addr show $INT_WAN | awk '/inet/ {print $2}')

case "$1" in
    start)
        echo "Starting ipv6update service"

        if [ ! -r "$PIDFILE" ]; then

        exec >/dev/null
        exec 2>/dev/null

        (
                trap "" TERM
        echo ${BASHPID} > "$NAME".pid

                ./ipv6update

                while true
                do
                        IP_ADDR=$(ip addr show $INT_WAN | awk '/inet/ {print $2}')
                        if [ "$IP_ADDR" != "$WAN_IP" ]; then
                        WAN_IP="$IP_ADDR"
                        ./ipv6update
                        fi
                sleep 60
                done
                )&

        fi
        if read pid < "$PIDFILE" && ps -p "$pid" > /dev/null 2>&1; then
            echo "$NAME allready is running $pid"
            exit 0
        else
            echo "$NAME is not running but $PIDFILE exists."
            exit 1
        fi
        ;;
    stop)
        echo "Stopping ipv6update service"
        if [ ! -r "$PIDFILE" ]; then
            echo "$NAME is not running."
            exit 3
        fi
        if read pid < "$PIDFILE" && kill -9 "$pid" > /dev/null 2>&1 && rm "$PIDFILE"; then
            echo "$NAME is stopping."
            exit 0
        else
            echo "$NAME is not running but $PIDFILE exists."
            exit 1
        fi
        ;;
    restart)
            $0 stop
            sleep 2
            $0 start
        ;;
    status)
        echo -n "Status of $NAME: "
        if [ ! -r "$PIDFILE" ]; then
            echo "$NAME is not running."
            exit 3
        fi
        if read pid < "$PIDFILE" && ps -p "$pid" > /dev/null 2>&1; then
            echo "$NAME is running $pid"
            exit 0
        else
            echo "$NAME is not running but $PIDFILE exists."
            exit 1
        fi
        ;;
    *)
        echo "$0 Usage: start|stop|restart|status" >&2
        exit 3
    ;;
esac

exit 0