#!/usr/bin/lua
--! Copyright (C) 2021 Santiago Piccinini <spiccinini@altermundi.net>
--!
--! This is free software, licensed under the GNU Affero General Public License v3.

local ubus = require "ubus"
local utils = require "lime.utils"

local NONWORKING_ROUTE_METRIC = 84831

local conn = ubus.connect()
if not conn then
    error("Failed to connect to ubus")
end

local wan4_status = conn:call("network.interface.wan", "status", {})
local wan_ifc = wan4_status.device

--! Do our best to select only the "original" default route installed. Using grep because
--! using the dev argument removes the dev part of the ip route output.
local route = utils.unsafe_shell("ip route show default metric 0 | grep " .. wan_ifc):gsub("\n","")

--! replace the default route with one that has metric NONWORKING_ROUTE_METRIC
if route ~= '' then
    os.execute("ip r add " .. route .. " metric " .. tonumber(NONWORKING_ROUTE_METRIC))
    os.execute("ip r del " .. route)
end

--! remove the babel redistributable route
os.execute("ip r del default proto 7")