^^&&^^

Edit File: http-robtex-reverse-ip.nse

local http = require "http"
local ipOps = require "ipOps"
local stdnse = require "stdnse"
local string = require "string"
local table = require "table"

description = [[
Obtains up to 100 forward DNS names for a target IP address by querying the Robtex service (http://www.robtex.com/ip/).
]]

author = "riemann"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "safe", "external"}

--- Scrape reverse ip informations from robtex website
-- @param data string containing the retrieved web page
-- @return table containing the resolved host names
function parse_robtex_response(data)
	local data = string.gsub(data,"\r?\n","")
	local result = {}
	for num,href,link in string.gmatch(data,"<span id=\"dns(%d+)\"><a href=\"(.-)\">(.-)</a></span>") do
		table.insert(result,link)
	end
	return result
end

prerule = function() return stdnse.get_script_args("http-robtex-reverse-ip.host") ~= nil end

action = function(host, port)
	local target = stdnse.get_script_args("http-robtex-reverse-ip.host")
	local ip = ipOps.ip_to_str(target)
	if ( not(ip) or #ip ~= 4 ) then
		return stdnse.format_output(false, "The argument \"http-robtex-reverse-ip.host\" did not contain a valid IPv4 address")
	end
 
	local link = "http://www.robtex.com/ip/"..target..".html"
	local htmldata = http.get_url(link)
	local domains = parse_robtex_response(htmldata.body)
	if ( #domains > 0 ) then
	    return stdnse.format_output(true, domains)
	end	
end