#!/bin/bash

. $(dirname $0)/functions

option	account		standard_option
option  mode            standard_option pppoe
option  device          standard_option
option	vpi		standard_option
option	vci		standard_option
option	mtu		standard_option	1492
option	mru		standard_option	1492
option	defaultroute	boolean_option	1
option	statefile	standard_option	/var/state/adsl
option	pidfile		reserved_option /var/run/adsl.pid
option	plugindir	standard_option	/usr/lib/pppd/%%PKGVER%%
option	unit		standard_option

function do_status {
   if [ ! -r "$pidfile" ]; then
	echo "adsl status = down (no pid file)"
	exit 1
   fi
   pid=$(<"$pidfile")
   if [ -n "$pid" -a -L /proc/$pid/cwd ]; then
	adsl=disabled ; pppd="not running"
	[ -e "$opt_statefile" ] && adsl=$(<"$opt_statefile")
        [ -n "$(pidof pppd)" ] && pppd="running"
	echo "adsl status = running,$adsl,pppd $pppd"
	return 0
   else
	echo "adsl status = down (no process)"
	exit 1
   fi
}

function do_check {
   do_status "$@"
}

function do_stop {
   echo "disabled" >$opt_statefile
   #pids=$(pidof -o $$ adsl)
   pids=
   [ -e "$pidfile" ] && pids=$(<"$pidfile")
   if [ -n "$pids" ]; then
      kill $pids >/dev/null 2>&1
   fi
   killall pppd >/dev/null 2>&1
   killall -CONT pppd >/dev/null 2>&1
   retry=0
   while [ $retry -lt 3 ] && pidof pppd >/dev/null; do
	usleep $[ 100000 << $retry ]
	retry=$[ $retry + 1 ]
   done
   killall -9 pppd >/dev/null 2>&1
   killall -CONT pppd >/dev/null 2>&1
   rm -f "$pidfile"
   return 0
}

function do_help {
   echo "Usage: ${0##*/} <start|stop|status>"
   return 0
}

function do_start {
    local PPPOAPLG="${opt_plugindir}/pppoatm.so"
    local PPPOEPLG="${opt_plugindir}/pppoe.so"

    if [ "$opt_mode" == "pppoe" ]; then
	if [ ! -x "$PPPOEPLG" ]; then
            echo "FATAL: PPPoE plugin '$PPPOEPLG' missing"
            exit 1
	fi
        if [ -z "$opt_device" ]; then
            echo "FATAL: in PPPoE mode, you need to name the physical device using option 'device'"
            exit 1
        fi
    elif [ "$opt_mode" == "pppoa" ]; then
	if [ ! -x "$PPPOAPLG" ]; then
            echo "FATAL: PPPoA plugin '$PPPOAPLG' missing"
            exit 1
	fi
        if [ -z "$opt_vpi" -o -z "$opt_vci" ]; then
            echo "FATAL: in PPPoA mode, you need to name VPI and VCI using options 'vpi' and 'vci'"
            exit 1
        fi
    else
        echo "FATAL: unknown mode '${opt_mode}'. Please specify either 'pppoa' or 'pppoe' using option 'mode'."
        exit 1
    fi

    if [ -z "$opt_account" ]; then
	echo "FATAL: provider account must be referenced using option 'account'"
	exit 1
    fi

    #pids=$(pidof -o $$ adsl)
    pids=
    [ -e "$pidfile" ] && pids=$(<"$pidfile")
    if [ -n "$pids" ]; then
	echo "ADSL already started (pid $pids)"
	exit 0
    fi

    exec </dev/null 1>&0 2>&0 

    echo "enabled" >$opt_statefile

    (
	while : ; do
	    if [ -e "$opt_statefile" ]; then
		state="$(<"$opt_statefile")"
	    else
		state=""
	    fi
	    if [ $state = "enabled" ]; then
		case $opt_mode in
	        pppoa)
		    /usr/sbin/pppd plugin $PPPOAPLG ${opt_vpi}.${opt_vci} \
			noipdefault noauth default-asyncmap ${opt_defaultroute:+defaultroute} \
			mtu $opt_mtu mru $opt_mru noaccomp noccp nobsdcomp nodeflate nopcomp \
			novj novjccomp user $opt_account lcp-echo-interval 20 lcp-echo-failure 3 \
			persist nodetach holdoff 0 ${opt_unit:+unit $opt_unit} </dev/null >/dev/null 2>&1
		    ;;
		pppoe)
		    /usr/sbin/pppd plugin $PPPOEPLG $opt_device \
			noipdefault noauth default-asyncmap ${opt_defaultroute:+defaultroute} \
			mtu $opt_mtu mru $opt_mru noaccomp noccp nobsdcomp nodeflate nopcomp \
			novj novjccomp user $opt_account lcp-echo-interval 20 lcp-echo-failure 3 \
			persist nodetach holdoff 0 ${opt_unit:+unit $opt_unit} </dev/null >/dev/null 2>&1
		    ;;
		esac
	    elif [ $state = "disabled" ]; then
		killall pppd >/dev/null 2>&1
		killall -CONT pppd >/dev/null 2>&1
		retry=0
		while [ $retry -lt 3 ] && pidof pppd >/dev/null; do
		    usleep $[ 100000 << $retry ]
		    retry=$[ $retry + 1 ]
		done
		killall -9 pppd >/dev/null 2>&1
		killall -CONT pppd >/dev/null 2>&1
	    fi
	    sleep 1
	done
	rm -f "$pidfile"
    ) &
    echo $! >"$pidfile"
    disown
    return 0
}

load_config