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426ed74a8b
parses an HTTP date in any of three possible formats. http-date.nse gets the Date: header field value from and HTTP server, then displays it with how much it differs from local time.
81 lines
1.8 KiB
Lua
81 lines
1.8 KiB
Lua
description = [[
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Gets the date from HTTP-like services. Also prints how much the date
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differs from local time. Local time is the time the HTTP request was
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sent, so the difference includes at least the duration of one RTT.
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]]
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---
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-- @output
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-- 80/tcp open http
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-- |_ http-date: Mon, 13 Jul 2009 20:53:46 GMT; -5s from local time.
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author = "David Fifield <david@bamsoftware.com>"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"discovery", "safe"}
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require("http")
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require("shortport")
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portrule = shortport.port_or_service({80, 443, 631, 8080},
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{"http", "https", "ipp", "http-alt"})
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-- Turn a positive or negative number of seconds into a string in one of the
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-- forms:
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-- 0s
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-- +2s
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-- -4s
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-- +02m38s
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-- -9h12m34s
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-- 5d17h05m06s
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local function format_difftime(t)
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local s, sign, sec
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if t > 0 then
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sign = "+"
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elseif t < 0 then
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sign = "-"
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else
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sign = ""
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end
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t = math.abs(t)
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-- Seconds.
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sec = t % 60
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s = string.format("%gs", sec)
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t = math.floor(t / 60)
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if t == 0 then return sign .. s end
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-- Minutes.
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s = string.format("%02dm%02ds", t % 60, sec)
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t = math.floor(t / 60)
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if t == 0 then return sign .. s end
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-- Hours.
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s = string.format("%dh", t % 24) .. s
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t = math.floor(t / 24)
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if t == 0 then return sign .. s end
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-- Days.
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s = string.format("%dd", t) .. s
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return sign .. s
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end
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action = function(host, port)
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-- Get local time in UTC.
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local request_time = os.time(os.date("!*t"))
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local response = http.get(host, port, "/")
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if not response.status or not response.header["date"] then
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return
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end
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local date = http.parse_date(response.header["date"])
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if not date then
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return
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end
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-- Should account for estimated RTT too.
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local diff = os.difftime(os.time(date), request_time)
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return string.format("%s; %s from local time.",
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response.header["date"], format_difftime(diff))
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end
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