#!/usr/bin/sh
#----------------------------------------------------------------------------
# /etc/ppp/ip-down - called whenever a (i)ppp connection has been come down
#
# Creation:     2002-11-24  fm
# Last Update:  $Id$
#
# Copyright (c) 2002-@@YEAR@@ the eisfair team, team(at)eisfair(dot)org
#
# 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.
#----------------------------------------------------------------------------

real_interface=${1}
interface=${1}
tty=${2}
speed=${3}
local=${4}
remote=${5}

rm -f /run/${interface}.ip

# default route existing or last default route interface going down?
if [ -f /etc/default-route-interface ]
then
    default_route_interface=$(/usr/bin/cat /etc/default-route-interface)
elif [ -f /etc/last-default-route-interface ]
then
    default_route_interface=$(/usr/bin/cat /etc/last-default-route-interface)
    rm -f /etc/last-default-route-interface
fi

if [ "${default_route_interface}" = "${interface}" ]
then
    # Call all custom ip-downs
    for j in /etc/ppp/ip-down.*
    do
        if [ -f ${j} ]
        then
            . ${j}
        fi
    done
fi


if [ -f /run/${interface}.route-fix -a -f /run/${interface}.conf ]
then
    # get configuration from file, format:
    # local remote netmask {network real_netmask}*
    conf=$(/usr/bin/cat /run/${interface}.conf)
    set ${conf}

    ip=${1}
    subnet=${3}
    network=$(/usr/bin/netcalc network ${ip}:${subnet})
    netmaskbits="/$(/usr/bin/netcalc netmaskbits ${network}:${subnet})"

    # restore original device configuration
    /usr/sbin/ip link set dev ${interface} down
    /usr/sbin/ip addr add ${ip}/${netmaskbits} peer ${2} dev ${interface}
    /usr/sbin/ip link set dev ${interface} up

    shift 3

    # setup routes again
    while [ -n "${1}" ]
    do
        ip=${1}
        subnet=${2}
        network=$(/usr/bin/netcalc network ${ip}:${subnet})
        netmaskbits="$(/usr/bin/netcalc netmaskbits ${network}:${subnet})"

        /usr/sbin/ip route add ${ip}${netmaskbits} dev ${interface}
       shift 2
    done

    #setup default route if our interface is the default routes interface
    if [ -f /etc/default-route-interface ] # default route existing?
    then
        default_route_interface=$(/usr/bin/cat /etc/default-route-interface)

        if [ "${default_route_interface}" = "${interface}" ]
        then
            /usr/sbin/ip route add default ${interface}
        fi
    fi
fi

exit 0