description = [[ Tries to find hostnames that resolve to the target's IP address by querying the online database at http://www.bfk.de/bfk_dnslogger.html. The script is in the "external" category because it sends target IPs to a third party in order to query their database. ]] --- -- @args hostmap.prefix If set, saves the output for each host in a file -- called "". The file contains one entry per line. -- @args newtargets If set, add the new hostnames to the scanning queue. -- This the names presumably resolve to the same IP address as the -- original target, this is only useful for services such as HTTP that -- can change their behavior based on hostname. -- -- @usage -- nmap --script hostmap --script-args hostmap.prefix=hostmap- -- -- @output -- Host script results: -- | hostmap: Saved to hostmap-nmap.org -- | insecure.org -- | 74.207.254.18 -- | web.insecure.org -- | download.insecure.org -- | images.insecure.org -- | www.insecure.org -- | nmap.org -- | www.nmap.org -- | sectools.org -- | mirror.sectools.org -- | www.sectools.org -- |_seclists.org author = "Ange Gutek" license = "Same as Nmap--See http://nmap.org/book/man-legal.html" categories = {"external", "discovery", "intrusive"} require "dns" require "ipOps" require "http" require "stdnse" require "target" local HOSTMAP_SERVER = "www.bfk.de" local filename_escape, write_file hostrule = function(host) return not ipOps.isPrivate(host.ip) end action = function(host) local query = "/bfk_dnslogger.html?query=" .. host.ip local response response = http.get(HOSTMAP_SERVER, 80, query) if not response.status then return string.format("Error: could not GET http://%s%s", HOSTMAP_SERVER, query) end local hostnames = {} for entry in string.gmatch(response.body, "#result\">([^<]-)") do if not hostnames[entry] then if target.ALLOW_NEW_TARGETS then local status, err = target.add(entry) end hostnames[entry] = true if string.match(entry, "%d+%.%d+%.%d+%.%d+") or dns.query(entry) then hostnames[#hostnames + 1] = entry else hostnames[#hostnames + 1] = entry .. " (cannot resolve)" end end end if #hostnames == 0 then if not string.find(response.body, "

The server returned no hits.

") then return "Error: found no hostnames but not the marker for \"no hostnames found\" (pattern error?)" end return end local hostnames_str = stdnse.strjoin("\n", hostnames) local output_str local filename_prefix = stdnse.get_script_args("hostmap.prefix") if filename_prefix then local filename = filename_prefix .. filename_escape(host.targetname or host.ip) local status, err = write_file(filename, hostnames_str .. "\n") if status then output_str = string.format("Saved to %s\n", filename) else output_str = string.format("Error saving to %s: %s\n", filename, err) end else output_str = "\n" end output_str = output_str .. stdnse.strjoin("\n", hostnames) return output_str end -- Escape some potentially unsafe characters in a string meant to be a filename. function filename_escape(s) return string.gsub(s, "[%z/=]", function(c) return string.format("=%02X", string.byte(c)) end) end function write_file(filename, contents) local f, err = io.open(filename, "w") if not f then return f, err end f:write(contents) f:close() return true end