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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ--- Functions for dealing with dates and timestamps -- -- @copyright Same as Nmap--See https://nmap.org/book/man-legal.html -- @class module -- @name datetime -- @author Daniel Miller local stdnse = require "stdnse" local os = require "os" local math = require "math" local string = require "string" _ENV = stdnse.module("datetime", stdnse.seeall) local difftime = os.difftime local time = os.time local date = os.date local floor = math.floor local fmod = math.fmod local format = string.format local match = string.match --- Record a time difference between the scanner and the target -- -- The skew will be recorded in the host's registry for later retrieval and -- analysis. Adjusts for network distance by subtracting half the smoothed -- round-trip time. -- --@param host The host being scanned --@param timestamp The target timestamp, in seconds. --@param received The local time the stamp was received, in seconds. function record_skew(host, timestamp, received) local skew_tab = host.registry.datetime_skew skew_tab = skew_tab or {} -- No srtt? I suppose we'll ignore it, but this could cause problems local srtt = host.times and host.times.srtt or 0 local adjusted = difftime(floor(timestamp), floor(received)) - srtt / 2.0 skew_tab[#skew_tab + 1] = adjusted stdnse.debug2("record_skew: %s", adjusted) host.registry.datetime_skew = skew_tab end -- Work around Windows error formatting time zones where 1970/1/1 UTC was 1969/12/31 local utc_offset_seconds do -- What does the calendar say locally? local localtime = date("*t", 86400) -- What does the calendar say in UTC? local gmtime = date("!*t", 86400) -- Interpret both as local calendar dates and find the difference. utc_offset_seconds = difftime(time(localtime), time(gmtime)) end -- The offset in seconds between local time and UTC. -- -- That is, if we interpret a UTC date table as a local date table by passing -- it to os.time, how much must be added to the resulting integer timestamp to -- make it correct? -- -- In other words, subtract this value from a timestamp if you intend to use it -- in os.date. function utc_offset() return utc_offset_seconds end --- Convert a date table into an integer timestamp. -- -- Unlike os.time, this does not assume that the date table represents a local -- time. Rather, it takes an optional offset number of seconds representing the -- time zone, and returns the timestamp that would result using that time zone -- as local time. If the offset is omitted or 0, the date table is interpreted -- as a UTC date. For example, 4:00 UTC is the same as 5:00 UTC+1: -- -- date_to_timestamp({year=1970,month=1,day=1,hour=4,min=0,sec=0}) --> 14400 -- date_to_timestamp({year=1970,month=1,day=1,hour=4,min=0,sec=0}, 0) --> 14400 -- date_to_timestamp({year=1970,month=1,day=1,hour=5,min=0,sec=0}, 1*60*60) --> 14400 -- -- And 4:00 UTC+1 is an earlier time: -- -- date_to_timestamp({year=1970,month=1,day=1,hour=4,min=0,sec=0}, 1*60*60) --> 10800 -- function date_to_timestamp(date_t, offset) local status, tm = pcall(time, date_t) if not status then stdnse.debug1("Invalid date for this platform: %s", tm) return nil end offset = offset or 0 return tm + utc_offset() - offset end local function format_tz(offset) local sign, hh, mm if not offset then return "" end if offset < 0 then sign = "-" offset = -offset else sign = "+" end -- Truncate to minutes. offset = floor(offset / 60) hh = floor(offset / 60) mm = floor(fmod(offset, 60)) return format("%s%02d:%02d", sign, hh, mm) end --- Format a date and time (and optional time zone) for structured output. -- -- Formatting is done according to RFC 3339 (a profile of ISO 8601), except -- that a time zone may be omitted to signify an unspecified local time zone. -- Time zones are given as an integer number of seconds from UTC. Use -- 0 to mark UTC itself. Formatted strings with a time zone look -- like this: -- -- format_timestamp(os.time(), 0) --> "2012-09-07T23:37:42+00:00" -- format_timestamp(os.time(), 2*60*60) --> "2012-09-07T23:37:42+02:00" -- -- Without a time zone they look like this: -- -- format_timestamp(os.time()) --> "2012-09-07T23:37:42" -- -- -- This function should be used for all dates emitted as part of NSE structured -- output. function format_timestamp(t, offset) if type(t) == "table" then return format( "%d-%02d-%02dT%02d:%02d:%02d", t.year, t.month, t.day, t.hour, t.min, t.sec ) else local tz_string = format_tz(offset) offset = offset or 0 local status, result = pcall(date, "!%Y-%m-%dT%H:%M:%S", floor(t + offset)) if not status then local tmp = floor(t + offset) local extra_years local seconds_in_year = 31556926 if tmp > 0xffffffff then -- Maybe too far in the future? extra_years = (tmp - 0xffffffff) // seconds_in_year + 1 elseif tmp < -utc_offset() then -- Windows can't display times before the epoch extra_years = tmp // seconds_in_year end if extra_years then tmp = tmp - extra_years * seconds_in_year status, result = pcall(date, "!*t", tmp) if status then -- seconds_in_year is imprecise, so we truncate to date only result = format("%d-%02d-%02d?", result.year + extra_years, result.month, result.day) end end end if not status then return ("Invalid timestamp: %s"):format(t) end return result .. tz_string end end --- Format a time interval into a string -- -- String is in the same format as format_difftime -- @param interval A time interval -- @param unit The time unit division as a number. If interval is -- in milliseconds, this is 1000 for instance. Default: 1 (seconds) -- @return The time interval in string format function format_time(interval, unit) local sign = "" if interval < 0 then sign = "-" interval = math.abs(interval) end unit = unit or 1 local precision = floor(math.log(unit, 10)) local sec = (interval % (60 * unit)) / unit interval = interval // (60 * unit) local min = interval % 60 interval = interval // 60 local hr = interval % 24 interval = interval // 24 local s = format("%.0fd%02.0fh%02.0fm%02.".. precision .."fs", interval, hr, min, sec) -- trim off leading 0 and "empty" units return sign .. (match(s, "([1-9].*)") or format("%0.".. precision .."fs", 0)) end --- Format the difference between times t2 and t1 -- into a string -- -- String is in one of the forms (signs may vary): -- * 0s -- * -4s -- * +2m38s -- * -9h12m34s -- * +5d17h05m06s -- * -2y177d10h13m20s -- The string shows t2 relative to t1; i.e., the -- calculation is t2 minus t1. function format_difftime(t2, t1) local d, s, sign, yeardiff d = difftime(time(t2), time(t1)) if d > 0 then sign = "+" elseif d < 0 then sign = "-" t2, t1 = t1, t2 d = -d else sign = "" end -- t2 is always later than or equal to t1 here. -- The year is a tricky case because it's not a fixed number of days -- the way a day is a fixed number of hours or an hour is a fixed -- number of minutes. For example, the difference between 2008-02-10 -- and 2009-02-10 is 366 days because 2008 was a leap year, but it -- should be printed as 1y0d0h0m0s, not 1y1d0h0m0s. We advance t1 to be -- the latest year such that it is still before t2, which means that its -- year will be equal to or one less than t2's. The number of years -- skipped is stored in yeardiff. if t2.year > t1.year then local tmpyear = t1.year -- Put t1 in the same year as t2. t1.year = t2.year d = difftime(time(t2), time(t1)) if d < 0 then -- Too far. Back off one year. t1.year = t2.year - 1 d = difftime(time(t2), time(t1)) end yeardiff = t1.year - tmpyear t1.year = tmpyear else yeardiff = 0 end local s = format_time(d) if yeardiff == 0 then return sign .. s end -- Years. s = format("%dy", yeardiff) .. s return sign .. s end return _ENV