#!/bin/sh
# Copyright (C) 2018-2019 Ycarus (Yannick Chabanois) <ycarus@zugaina.org>

while true; do
	if [ "$(uci -q get glorytun.vpn.enable)" = "1" ]; then
		iface=$(uci -q get glorytun.vpn.dev)
		addr=$(uci -q get glorytun.vpn.localip)
		peer=$(uci -q get glorytun.vpn.remoteip)
	elif [ "$(uci -q get glorytun-udp.vpn.enable)" = "1" ]; then
		iface=$(uci -q get glorytun-udp.vpn.dev)
		addr=$(uci -q get glorytun-udp.vpn.localip)
		peer=$(uci -q get glorytun-udp.vpn.remoteip)
	elif [ "$(uci -q get dsvpn.vpn.enable)" = "1" ]; then
		iface=$(uci -q get dsvpn.vpn.dev)
		addr=$(uci -q get dsvpn.vpn.localip)
		peer=$(uci -q get dsvpn.vpn.remoteip)
	elif [ "$(uci -q get mlvpn.general.enable)" = "1" ]; then
		iface=$(uci -q get mlvpn.general.interface_name)
	elif [ "$(uci -q get openvpn.omr.enabled)" = "1" ]; then
		iface=$(uci -q get openvpn.omr.dev)
	fi
	[ -z "$addr" ] && addr=$(ubus call network.interface.omrvpn status | jsonfilter -q -e '@["ipv4-address"][0].address' | tr -d "\n")
	if [ -n "$iface" ] && [ -d "/sys/class/net/$iface" ]; then
		[ -z "$addr" ] && [ -n "$iface" ] && addr=$(ip -4 addr show dev $iface | grep inet | awk '{print $2}' | cut -d/ -f1 | tr -d "\n")
		[ -z "$peer" ] && peer=$(ubus call network.interface.omrvpn status | jsonfilter -q -l 1 -e '@.route[@.target="0.0.0.0"].nexthop' | tr -d "\n")
		[ -z "$peer" ] && peer=$(ip -4 r list dev $iface | grep via | grep -v default | grep -v metric | grep -v / | awk '{print $1; exit}' | tr -d "\n")
		[ -z "$peer" ] && peer=$(ip -4 r list dev $iface | grep kernel | awk '/proto kernel/ {print $1}' | grep -v / | tr -d "\n")
		[ -n "$addr" ] && [ -n "$peer" ] && {
			if [ "$addr" != "$(uci -q get network.omr6in4.ipaddr)" ] || [ "$peer" != "$(uci -q get network.omr6in4.peeraddr)" ] || [ "$(ip -6 route show default | grep via)" = "" ]; then
				logger -t "omr6in4" "Set network for OMR 6in4 to local $addr peer $peer"
				uci -q batch <<-EOF
					set network.omr6in4.ipaddr=$addr
					set network.omr6in4.peeraddr=$peer
					set network.omr6in4.metric=1
					commit network
				EOF
				if [ -n "$(ip tunnel | grep omr6in4)" ]; then
					ip tunnel change "6in4-omr6in4" mode sit local ${addr} remote ${peer} ttl 64 > /dev/null 2>&1
				else
					ifup omr6in4 > /dev/null 2>&1
				fi
				sleep 5
				#ipv6_addr=$(ip -6 addr show dev 6in4-omr6in4 | grep inet | awk '{print $2'} | cut -d/ -f1 | tr -d "\n")
				#ipv6_gw=$(echo $ipv6_addr | sed 's/1$/2')
				ipv6_addr=$(ubus call network.interface.omr6in4 status | jsonfilter -q -l 1 -e '@["ipv6-address"][0].address' | tr -d "\n")
				ip -6 addr add $ipv6_addr dev 6in4-omr6in4 > /dev/null 2>&1
				ipv6_gw=$(ubus call network.interface.omr6in4 status | jsonfilter -q -l 1 -e '@.route[@.target="::"].nexthop' | tr -d "\n")
				[ "$ipv6_gw" = "::" ] && ipv6_gw='fe80::a00:1'
				[ -z "$ipv6_gw" ] && ipv6_gw='fe80::a00:1'
				#[ -z "$ipv6_gw" ] && ipv6_gw='fe80::aff:ff01'
				ip -6 route add ${ipv6_gw} dev 6in4-omr6in4 > /dev/null 2>&1
				ip -6 route 2002::/16 dev 6in4-omr6in4 > /dev/null 2>&1
				ip -6 route replace default via ${ipv6_gw} dev 6in4-omr6in4 metric 1 > /dev/null 2>&1
				if [ "$(uci -q get openmptcprouter.settings.uci_route)" = "1" ]; then
					uci -q batch <<-EOF
						set network.omr6in4_route6_default=route6
						set network.omr6in4_route6_default.interface=omr6in4
						set network.omr6in4_route6_default.target='::'
						set network.omr6in4_route6_default.gateway=$ipv6_gw
						commit network
					EOF
				fi
			fi
		}
	fi
	sleep 10
done