local datetime = require "datetime" local http = require "http" local os = require "os" local shortport = require "shortport" local stdnse = require "stdnse" local string = require "string" local datetime = require "datetime" description = [[ Gets the date from HTTP-like services. Also prints how much the date differs from local time. Local time is the time the HTTP request was sent, so the difference includes at least the duration of one RTT. ]] --- -- @output -- 80/tcp open http -- |_http-date: Thu, 02 Aug 2012 22:11:03 GMT; 0s from local time. -- 80/tcp open http -- |_http-date: Thu, 02 Aug 2012 22:07:12 GMT; -3m51s from local time. -- -- @xmloutput -- 2012-08-02T23:07:12+00:00 -- -231 author = "David Fifield" license = "Same as Nmap--See https://nmap.org/book/man-legal.html" categories = {"discovery", "safe"} portrule = shortport.http action = function(host, port) local response = http.get(host, port, "/") local request_time = os.time() if not response.status or not response.header["date"] then return end local response_date = http.parse_date(response.header["date"]) if not response_date then return end local response_time = datetime.date_to_timestamp(response_date) local output_tab = stdnse.output_table() output_tab.date = datetime.format_timestamp(response_time, 0) output_tab.delta = os.difftime(response_time, request_time) datetime.record_skew(host, response_time, request_time) local output_str = string.format("%s; %s from local time.", response.header["date"], datetime.format_difftime(os.date("!*t", response_time), os.date("!*t", request_time))) return output_tab, output_str end