#!/bin/sh

set -e

if [ ! -f "$1" ]; then
	echo "usage: $(basename "$0") FILE"
	exit 1
fi

. "$(readlink -f "$1")"

DEV="gt${HOST:+c}-$(basename "$1")"

# Setting BIND is like going to 'expert mode'
# This helper is pretty stupid and still needs some work
if [ -n "$HOST" ]; then
	if [ -z "$PREF" ]; then
		PREF=$(ip rule | awk '/from all lookup main/{print $1; exit}' | tr -d :)
		PREF=$((PREF-1))
	fi
	if [ -z "$BIND" ]; then
		BIND=$(ip route get "$HOST" | awk '/src/{getline;print $0}' RS=' ')
		ip rule add from "$BIND" table main pref "$((PREF-1))"
	fi
	ip rule add from all table 200 pref "$PREF"
fi

exec glorytun \
	v4only \
	keyfile "$1".key \
	dev "$DEV" \
	${HOST:+host "$HOST"} \
	${PORT:+port "$PORT"} \
	${BIND:+bind "$BIND"} \
	${BIND_PORT:+bind-port "$BIND_PORT"} \
	${MTU:+mtu "$MTU"} \
	${MTU_AUTO:+mtu-auto}