#!/usr/bin/lua

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

function readPidFile()
	local pidFile = io.open("/var/run/tunneldigger.mesh-vpn.pid", "r")
	local returnPid = "0"
	if pidFile~=nil then 
		returnPid = pidFile:read("*l") 
		io.close(pidFile)
	end
	return returnPid
end

function getNeighbourCount()
	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 1
                        end
                end
        end
	handleBatctl.close()
        return nil
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."')
		restartTunneldigger()
		return
	end
        if getNeighbourCount() ~= 1 then
		io.popen('logger -t tunneldigger-watchdog "No vpn-mesh neighbours found."')
		restartTunneldigger()
		return
        end
end