#!/bin/sh -e

#
# /etc/ppp/ip-up.d/99tunnel v0.03 -- ip-up snippet for tunnels
#     Adjusts default route to use the tunnel when connection comes up.
#     Makes sure tunneled packets use the old default route.
#
#     Copyright (c)2005 by Christoph Sommer
#     <http://www.deltadevelopment.de/users/christoph>
#
#     Feel free to use however you like as long as
#     you leave these comments intact.
#


IPROUTE=/sbin/ip

# skip this script if pppd's ipparam is not set to "tunnel"
if [ ! "$PPP_IPPARAM" = "tunnel" ]; then
        exit 0
fi

# check for "iproute" utilities
if [ ! -x $IPROUTE ]; then
        echo 'This script needs the "iproute" utility suite' >&2
        exit 1
fi

# get old default route
DEFROUTE=$($IPROUTE route show | grep "^default" | cut -c9-)
if [ ! -n "$DEFROUTE" ]; then
        echo 'Could not determine default route' >&2
        exit 1
fi

# set route to tunnel endpoint via old default route
$IPROUTE route replace $PPP_REMOTE $DEFROUTE

# set new default route to go through the tunnel
route add default gw $PPP_LOCAL

# done
exit 0