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local http = require "http"
local os = require "os"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
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
-- <elem key="date">2012-08-02T23:07:12+00:00</elem>
-- <elem key="delta">-231</elem>
author = "David Fifield"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
portrule = shortport.http
action = function(host, port)
local request_time = os.time()
local response = http.get(host, port, "/")
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 = stdnse.date_to_timestamp(response_date)
local output_tab = stdnse.output_table()
output_tab.date = stdnse.format_timestamp(response_time, 0)
output_tab.delta = os.difftime(response_time, request_time)
local output_str = string.format("%s; %s from local time.",
response.header["date"], stdnse.format_difftime(os.date("!*t", response_time), os.date("!*t", request_time)))
return output_tab, output_str
end