#!/usr/bin/lua

--! LibreMesh
--! Copyright (C) 2020 Gui iribarren <gui@altermundi.net>
--!
--! This program is free software: you can redistribute it and/or modify
--! it under the terms of the GNU Affero General Public License as
--! published by the Free Software Foundation, either version 3 of the
--! License, or (at your option) any later version.
--!
--! This program is distributed in the hope that it will be useful,
--! but WITHOUT ANY WARRANTY; without even the implied warranty of
--! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--! GNU Affero General Public License for more details.
--!
--! You should have received a copy of the GNU Affero General Public License
--! along with this program.  If not, see <http://www.gnu.org/licenses/>.

local JSON = require("luci.jsonc")

local uci = require("uci"):cursor()

uci:foreach("dhcp", "dnsmasq",
  function(s)
    localDomain = uci:get("dhcp", s[".name"], "local"):gsub("/","")
  end
)

local localHostname = io.input("/proc/sys/kernel/hostname"):read("*line")

local content = {}

--! example key="cloud1.mesh", example value.data="fd0d:fe46:8ce8::ab:cd00"
for key,value in pairs(
 JSON.parse(io.stdin:read("*all")) ) do
 if value.data and value.author ~= localHostname and key ~= localDomain then
   table.insert(content, "server=/" .. key .. "/" .. value.data)
 end
end

local outputFile = io.open("/var/shared-state/dnsmasq_servers", "w")
if outputFile then
	outputFile:write(table.concat(content,"\n").."\n")
	outputFile:close()
	os.execute("killall -HUP dnsmasq 2>/dev/null")
end