#!/bin/sh

# adapted from
# https://unix.stackexchange.com/questions/149293/feed-all-traffic-through-openvpn-for-a-specific-network-namespace-only

# vpn_wrapper.sh creates another script of name helper_script<timestamp>.sh,
# which gets called by openvpn process, exports NAMESPACE_NAME and WRAPPER_PID
# variables and then runs this script

case $script_type in
    up)
	        ip netns add $NAMESPACE_NAME
                ip netns exec $NAMESPACE_NAME ip link set dev lo up
                ip link set dev "$1" up netns $NAMESPACE_NAME mtu "$2"
                ip netns exec $NAMESPACE_NAME ip addr add dev "$1" \
                        "$4/${ifconfig_netmask:-30}" \
                        ${ifconfig_broadcast:+broadcast "$ifconfig_broadcast"}
                if [ -n "$ifconfig_ipv6_local" ]; then
                        ip netns exec $NAMESPACE_NAME ip addr add dev "$1" \
                                "$ifconfig_ipv6_local"/112
                fi
                ;;
        route-up)
                ip netns exec $NAMESPACE_NAME ip route add default via "$ifconfig_remote"
		
                if [ -n "$ifconfig_ipv6_remote" ]; then
                        ip netns exec $NAMESPACE_NAME ip route add default via \
                                "$ifconfig_ipv6_remote"
                fi

		# notify our sh process, that openvpn finished initializing
		kill -usr1 $WRAPPER_PID
                ;;
        down)
                ip netns delete $NAMESPACE_NAME
                ;;
esac