local nmap = require "nmap"
local stdnse = require "stdnse"
local table = require "table"

description=[[
Discovers Telldus Technologies TellStickNet devices on the LAN. The Telldus
TellStick is used to wirelessly control electric devices such as lights,
dimmers and electric outlets. For more information: http://www.telldus.com/
]]

---
-- @usage
-- nmap --script broadcast-tellstick-discover
--
-- @output
-- | broadcast-tellstick-discover:
-- |   192.168.0.100
-- |     Product: TellStickNet
-- |     MAC: ACCA12345678
-- |     Activation code: 8QABCDEFGH
-- |_    Version: 3
--

author = "Patrik Karlsson"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"broadcast", "safe"}

prerule = function() return ( nmap.address_family() == 'inet' ) end

action = function()
  local socket = nmap.new_socket("udp")
  local host, port = { ip = "255.255.255.255" }, { number = 30303, protocol = "udp" }

  socket:set_timeout(5000)
  if ( not(socket:sendto(host, port, "D")) ) then
    return stdnse.format_output(false, "Failed to send discovery request to server")
  end

  local output = {}

  while( true ) do
    local status, response = socket:receive()
    if ( not(status) ) then
      break
    end

    local status, _, _, ip = socket:get_info()
    if ( not(status) ) then
      stdnse.debug2("Failed to get socket information")
      break
    end

    local prod, mac, activation, version = response:match("^([^:]*):([^:]*):([^:]*):([^:]*)$")
    if ( prod and mac and activation and version ) then
      local output_part = {
        name = ip,
        ("Product: %s"):format(prod),
        ("MAC: %s"):format(mac),
        ("Activation code: %s"):format(activation),
        ("Version: %s"):format(version)
      }
      table.insert(output, output_part)
    end
  end

  if ( 0 < #output ) then
    return stdnse.format_output(true, output)
  end
end