#!/usr/bin/lua

function restart_tunneldigger()
	io.popen('logger -t tunneldigger-watchdog "Restarting Tunneldigger."')
	os.execute("/etc/init.d/tunneldigger restart")
end

function read_pid_file()
	local pidFile = io.open("/var/run/tunneldigger.mesh-vpn.pid", "r")
	if not pidFile then
		return nil
	end
	returnPid = pidFile:read("*l") 
	io.close(pidFile)
	return returnPid
end

function check_for_mesh_vpn_neighbours()
	local handleBatctl = io.popen("batctl o", 'r')
	if handleBatctl~=nil then
		for line in handleBatctl:lines() do
			if line:find('mesh%-vpn') then
				handleBatctl.close()
				return true
			end
		end
	end
	handleBatctl.close()
	return false
end

local uci = require('simple-uci').cursor()
if uci:get_bool('tunneldigger', 'mesh_vpn', 'enabled') then
	if io.popen("pgrep tunneldigger"):read("*l") ~= readPidFile() then
		io.popen('logger -t tunneldigger-watchdog "Process-Pid does not match with pid-File."')
		restart_tunneldigger()
		return
	end
	if check_for_mesh_vpn_neighbours() ~= true then
		io.popen('logger -t tunneldigger-watchdog "No vpn-mesh neighbours found."')
		restart_tunneldigger()
		return
	end
end