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+description = [[
+Checks if the website holds a mobile version.
+]]
+
+---
+-- @usage nmap -p80 --script http-mobileversion-checker.nse <host>
+--
+-- This script sets an Android User-Agent header and checks if the request
+-- will be redirected to a page different than a (valid) browser request
+-- would be. If so, this page is most likely to be a mobile version of the
+-- app.
+--
+-- @args newtargets If this is set, add any newly discovered hosts to nmap
+-- scanning queue. Default: nil
+--
+-- @output
+-- PORT STATE SERVICE REASON
+-- 80/tcp open http syn-ack
+-- |_ http-mobileversion-checker: Found mobile version: https://m.some-very-random-website.com (Redirected to a different host)
+--
+-- @see http-useragent-tester.nse
+
+categories = {"discovery", "safe"}
+author = "George Chatzisofroniou"
+license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
+
+local http = require "http"
+local target = require "target"
+local shortport = require "shortport"
+local httpspider = require "httpspider"
+local stdnse = require "stdnse"
+local url = require "url"
+
+getLastLoc = function(host, port, useragent)
+
+ local options
+
+ options = {header={}, no_cache=true, redirect_ok=function(host,port)
+ local c = 3
+ return function(url)
+ if ( c==0 ) then return false end
+ c = c - 1
+ return true
+ end
+ end }
+
+
+ options['header']['User-Agent'] = useragent
+
+ local response = http.get(host, port, '/', options)
+
+ if response.location then
+ return response.location[#response.location] or false
+ end
+
+ return false
+
+end
+
+portrule = shortport.port_or_service( {80, 443}, {"http", "https"}, "tcp", "open")
+
+action = function(host, port)
+
+ local newtargets = stdnse.get_script_args("newtargets") or nil
+
+ -- We don't crawl any site. We initialize a crawler to use its iswithinhost method.
+ local crawler = httpspider.Crawler:new(host, port, '/', { scriptname = SCRIPT_NAME } )
+
+ local loc = getLastLoc(host, port, "Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.57 Safari/537.17")
+ local mobloc = getLastLoc(host, port, "Mozilla/5.0 (Linux; U; Android 4.0.3; ko-kr; LG-L160L Build/IML74K) AppleWebkit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30")
+
+ -- If the mobile browser request is redirected to a different page, that must be the mobile version's page.
+ if loc ~= mobloc then
+ local msg = "Found mobile version: " .. mobloc
+ local mobhost = url.parse(mobloc)
+ if not crawler:iswithinhost(mobhost.host) then
+ msg = msg .. " (Redirected to a different host)"
+ if newtargets then
+ target.add(mobhost.host)
+ end
+ end
+ return msg
+ end
+
+ return "No mobile version detected."
+
+end