66 lines
1.8 KiB
Lua
66 lines
1.8 KiB
Lua
local comm = require "comm"
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local datetime = require "datetime"
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local shortport = require "shortport"
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local stdnse = require "stdnse"
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local string = require "string"
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local stringaux = require "stringaux"
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local nmap = require "nmap"
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local os = require "os"
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description = [[
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Retrieves the day and time from the Time service.
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]]
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---
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-- @output
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-- PORT STATE SERVICE
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-- 37/tcp open time
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-- |_rfc868-time: 2013-10-23T10:33:00
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author = "Daniel Miller"
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license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
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categories = {"discovery", "safe", "version"}
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portrule = shortport.version_port_or_service(37, "time", {"tcp", "udp"})
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action = function(host, port)
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local status, result = comm.exchange(host, port, "", {bytes=4})
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if status then
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local stamp
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local width = #result
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if width == 4 then
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stamp = string.unpack(">I4", result)
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port.version.extrainfo = "32 bits"
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elseif width == 8 then
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stamp = string.unpack(">I4", result)
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port.version.extrainfo = "64 bits"
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else
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stdnse.debug1("Odd response: %s", stringaux.filename_escape(result))
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return nil
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end
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-- RFC 868 epoch is Jan 1, 1900
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stamp = stamp - 2208988800
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-- Make sure we don't stomp a more-likely service detection.
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if port.version.name == "time" then
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local recvtime = os.time()
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local diff = os.difftime(stamp,recvtime)
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if diff < 0 then diff = -diff end
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-- confidence decreases by 1 for each year the time is off.
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stdnse.debug1("Time difference: %d seconds (%0.2f years)", diff, diff / 31556926)
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local confidence = 10 - diff / 31556926
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if confidence < 0 then confidence = 0 end
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datetime.record_skew(host, stamp, recvtime)
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port.version.name_confidence = confidence
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nmap.set_port_version(host, port, "hardmatched")
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end
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return datetime.format_timestamp(stamp)
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end
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end
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