local event = require("event")
local serialization = require("serialization")
dns = {}

local component = require("component")
local modem = component.modem

dns.dns_server_address = "3b44489c-db5a-425c-b0bd-c2620fcdc2f5"
dns.port = 90

modem.open(dns.port)
function dns.resolve(domainname)
	modem.send(dns.dns_server_address, dns.port, "{data=\"".. domainname .. "\", msg=\"RESOLVE\"}")
	local _,_,from,port,dist,msg = event.pull(10, "modem_message")

	if msg == nil then
		error("Timed out")
		return
	end
	data = serialization.unserialize(msg)
	if data.data ~= nil or data.data ~= "" then
		return data.data
	end
end

function dns.declare(domainname)
	modem.send(dns.dns_server_address, dns.port, "{data=\"".. domainname .. "\", msg=\"DECLARE\"}")
	local _,_,from,port,dist,msg = event.pull(10, "modem_message")
	if data ~= nil then
		data = serialization.unserialize(msg)
		if string.match(data.msg, "DECLARED") then
			return true
		else
			return false
		end
	else
		return nil
	end
end

return dns