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local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"

description = [[
Extends version detection to detect NetBuster, a honeypot service
that mimes NetBus.
]]

---
-- @usage
-- nmap -sV -p 12345 --script netbus-version <target>
--
-- @output
-- 12345/tcp open  netbus  Netbuster (honeypot)

author = "Toni Ruottu"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"version"}


portrule = shortport.version_port_or_service ({}, "netbus", {"tcp"})

action = function( host, port )

  local socket = nmap.new_socket()
  socket:set_timeout(5000)
  local status, err = socket:connect(host, port)
  if not status then
    return
  end
  local buffer, _ = stdnse.make_buffer(socket, "\r")
  _ = buffer()
  if not (_ and _:match("^NetBus")) then
    stdnse.debug1("Not NetBus")
    return nil
  end
  socket:send("Password;0;\r")

  --NetBus answers to auth
  if buffer() ~= nil then
    return
  end

  --NetBuster does not
  port.version.name = "netbus"
  port.version.product = "NetBuster"
  port.version.extrainfo = "honeypot"
  port.version.version = nil
  nmap.set_port_version(host, port)
  return
end