....................................../////.===Shadow-Here===./////................................................ > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < ------------------------------------------------------------------------------------------------------------------- /////////////////////////////////////////////////////////////////////////////////////////////////////////////////// RIFF¤ WEBPVP8 ˜ ðÑ *ôô>‘HŸK¥¤"§£±¨àð enü¹%½_F‘åè¿2ºQú³íªú`N¿­3ÿƒügµJžaÿ¯ÿ°~¼ÎùnúîÞÖô•òíôÁÉß®Sm¥Ü/ ‡ó˜f£Ùà<˜„xëJ¢Ù€SO3x<ªÔ©4¿+ç¶A`q@Ì“Úñè™ÍÿJÌ´ª-˜ÆtÊÛL]Ïq*‘Ý”ì#ŸÌÏãY]@ê`¿ /ªfkØB4·®£ó z—Üw¥Pxù–ÞLШKÇN¾AkÙTf½è'‰g gÆv›Øuh~ a˜Z— ïj*á¥t d£“uÒ ¨`K˜¹ßþ]b>˜]_ÏÔ6W—è2r4x•íÖ…"ƒÖNîä!¦å Ú}ýxGøÌ —@ ;ÆÚŠ=ɾ1ý8lªË¥ô ^yf®Œ¢u&2©nÙÇ›ñÂñŒ³ aPo['½»øFùà­+4ê“$!lövlüÞ=;N®3ð‚õ›DÉKòÞ>ÄÍ ¥ˆuߤ#ˆ$6ù™¥îŠ‡y’ÍB¼ çxÛ;X"WL£R÷͝*ó-¶Zu}º.s¸sšXqù–DþÿvªhüïwyŸ ¯é³lÀ:KCûÄ£Ëá\…­ ~—ýóî ¼ûûÜTÓüÇy…ŽÆvc»¾×U ñ¸žþоP÷¦ó:Ò¨¨5;Ð#&#ÖúñläÿÁœ GxÉ­/ñ‡áQðìYÉtÒwŽ¼GÔ´zàÒò ð*ëzƒ•4~H]Ø‹f ñÓÈñ`NåWçs'ÆÏW^ø¹!XžµmQ5ÃËoLœÎ: ÞËÍ¥J ù…î èo£ßPÎñ¶ž8.Œ]ʵ~5›ÙË-ù*8ÙÖß±~ ©¹rÓê‚j¶d¸{^Q'˜±Crß ÚH—#¥¥QlÀ×ëã‡DÜ«èî þ&Çæžî;ŽÏºò6ÒLÃXy&ZŒ'j‚¢Ù€IßÚù+–MGi‰*jE€‘JcÜ ÓÌ EÏÚj]o˜ Þr <¾U ûŪæÍ/šÝH¥˜b”¼ ÁñßX GP›ï2›4WŠÏà×£…íÓk†¦H·ÅíMh–*nó÷à]ÁjCº€b7<ب‹¨5車bp2:Á[UªM„QŒçiNMa#<5›áËó¸HýÊ"…×Éw¹¦ì2º–x<›»a±¸3Weü®FÝ⑱ö–î–³|LPÈ~çð~Çå‡|º kD¢µÏàÆAI %1À% ¹Ò – ”ϝS¦‰4&¶£°à Öý”û_Ò Áw°A«Å€?mÇÛgHÉ/8)á¾ÛìáöŽP í¨PŸNÙµº¦‡§Ùš"ÿ«>+ªÕ`Ê÷‡‚ß Õû˜þãÇ-PÍ.¾XV‘€ dÜ"þ4¹ ±Oú‘©t¥¦FªÄÃÄ•b‚znýu½—#cDs˜ÃiÑOˆñ×QO=*IAÊ,¶ŽZƒ;‡wøXè%EÐk:F±Ú” .Ѽ+Áu&Ç`."pÈÉw o&¿dE6‘’EqTuK@Ì¥ã™À(Êk(h‰,H}RÀIXÛš3µ1©_OqÚÒJAñ$ÊÙÜ;D3çŒ[þùœh¬Ã³™ö6ç†NY".Ú‰ï[ªŸŒ '²Ð öø_¨ÂÉ9u鶳ÒŠõTàîMØ#û¯gN‡bÙ놚X„ö …ÉeüÌ^J ‹€.œ$Æ)βÄeæW#óüßĺŸ€ ÀzwV 9oä»f4V*uB «Ë†¹ì¯žR霓æHXa=&“I4K;¯ç‹h×·"UŠ~<•â•ªVêª&ÍSÃÆÅ?ÔqÎ*mTM ˜›µwêd#[C¡©§‘D<©àb†–ÁœøvH/,í:¯( ²£|4-„Æövv„Yͼ™^Á$ˆ„¢Û[6yB.åH*V¨æ?$=˜Ñ€•î¦ñ·­(VlŸ‘ nÀt8W÷´Bûba?q9ú¶Xƒl«ÿ\ù¶’þòUÐj/õ¢Ìµ³g$ƒÎR!¸»|Oߍë’BhîÚÑ¢ñåŒJ„®„£2Ð3•ô02Nt…!£Í]Ïc½Qÿ?ˆ<&ÃA¾Ú,JˆijÌ#5yz„‰Î|ÊŽ5QÏ:‹ÐaóVÔxW—CpeÏzÐïíçôÿÅ_[hãsÐ_/ŽTÝ?BîˆííV$<¿i>²F¬_Eß¿ †bÊŒº­ÿ®Z H“C}”¬,Mp ý/Bá£w>˜YV°aƒúh+cŠ- r/[%|üUMHäQ°X»|û/@|°¥Ð !BÔ Ç¢Ä©š+Õì D«7ìN¶ŽðÔ " ƶ’ÖçtA‰Û×}{tþz­¾GÍ›k¹OEJR$ Â׃ «ëÁ"oÉôž$oUK(Ä)Ãz³Ê-‹êN[Ò3Œñbï8P 4ƒ×q¢bo|?<ÛX¬òÄÍ°L–±›(™ûG?ýË©ÚÄ–ÂDØÐ_Ç¡ô ¾–ÄÏø ×e8Ë©$ÄF¹Å‹ì[©óìl:F¾f´‹‹Xì²ï®\¬ôùƒ ÿat¥óèÒùHß0äe‚;ü×h:ÆWðHž=Ã8骣"kœ'Y?³}Tûè€>?0l›e1Lòñ„aæKÆw…hÖŠùW…ÈÆÄ0ši·›[pcwËþñiêíY/~-Á5˜!¿†A›™Mÿþ(±“t@â“ö2­´TG5yé]çå僳 .·ÍïçÝ7UÚ±Ð/Nè»,_Ï ùdj7\ï Wì4›„»c¸àešg#ÒÊ⥭áØo5‘?ÌdÝô¯ ¹kzsƒ=´#ëÉK›Ø´±-¥eW?‡çßtòTã…$Ý+qÿ±ƒ÷_3Ô¥í÷:æ–ž<·Ö‡‰Å¢ š‡%Ô—utÌÈìðžgÖÀz²À—ï÷Óîäõ{K'´È÷³yaÏÁjƒô}ž§®æÊydÕÈë5¯èˆõvÕ©ã*çD„ “z„Ó‡^^xÂ3M§A´JG‚öï 3W'ˆ.OvXè¡ÊÕª?5º7†˜(˜Ç¶#çê’¶!ÌdZK§æ 0fãaN]òY³RV ™î$®K2R¨`W!1Ôó\;Ý ýB%qæK•&ÓÈe9È0êI±žeŸß -ú@žQr¦ ö4»M¼Áè¹µmw 9 EÆE_°2ó„ŸXKWÁ×Hóì^´²GѝF©óäR†¦‰ç"V»eØ<3ùd3ÿÚ¤Žú“Gi" —‘_ÙËÎ~Üö¯¥½Î»üŸEÚŽåmÞþí ;ÞólËΦMzA"Âf(´òá;Éï(/7½ûñÌ­cïÕçлþÝz¾-ÍvÑ“pH­–ðÓj$¸Äû¤‚‘ãUBË-n“2åPkS5&‹Â|+g^œ®Ì͆d!OïäîU«c;{Û!ÅŽ«ëZ9Ókóˆ]¯ƒ›né `ÇÒ+tÆš (ØKá¾—=3œ®•vuMñg²\ï Ec€ 05±d™‡×iÇ×›UúvÌ¢£Èþ¡ÕØô¶ßÎA"ß±#Ö²ˆÊŸ¦*Ä~ij|àø.-¼'»Ú¥£h ofº¦‡VsR=N½„Î v˜Z*SÌ{=jÑB‹tê…;’HžH¯8–îDù8ñ¢|Q•bÛçš–‹m³“ê¨ åÏ^m¬Žãþ©ïêO‡½6] µÆ„Ooòü ²x}N¦Ë3ïé¿»€›HA˜m%çÞ/¿í7Fø“‹léUk)É°Œµ8Q8›:ÀŠeT*šõ~ôڝG6 ¢}`ùH­–”¡k ‰P1>š†®9z11!X wKfmÁ¦xÑ,N1Q”–æB¶M…ÒÃv6SMˆhU¬ÊPŽï‘öj=·CŒ¯u¹ƒVIЃsx4’ömÛýc塶7ßŠß 57^\wÒÐÆ k§h,Œý î«q^R½3]J¸ÇðN ‚çU¬ôº^Áì} ³f©Õœ§ˆã:FÄÈ‚é(€™?àýÓüè1Gô£¼éj‚OÅñ  #>×—ßtà 0G¥Åa뀐kßhc™À_ÉñÞ#±)GD" YîäË-ÿÙ̪ ¹™a¯´¢E\ÝÒö‚;™„ë]_ p8‰o¡ñ+^÷ 3‘'dT4œŽ ðVë½° :¬víÑ«£tßÚS-3¶“þ2 †üüʨòrš¹M{É_¤`Û¨0ìjœøJ‡:÷ÃáZ˜†@GP&œÑDGÏs¡þ¦þDGú‘1Yá9Ôþ¼ ûø…§÷8&–ÜÑnÄ_m®^üÆ`;ÉVÁJ£?â€-ßê}suÍ2sõA NÌúA磸‘îÿÚ»ƒìö·á¿±tÑÐ"Tÿü˜[@/äj¬€uüªìù¥Ý˜á8Ý´sõj 8@rˆð äþZÇD®ÿUÏ2ùôõrBzÆÏÞž>Ì™xœ“ wiÎ×7_… ¸ \#€MɁV¶¥üÕÿPÔ9Z‡ø§É8#H:ƒ5ÀÝå9ÍIŒ5åKÙŠ÷qÄ>1AÈøžj"µÂд/ªnÀ qªã}"iŸBå˜ÓÛŽ¦…&ݧ;G@—³b¯“•"´4í¨ôM¨åñC‹ïùÉó¯ÓsSH2Ý@ßáM‡ˆKÀªÛUeø/4\gnm¥‹ŸŒ qÄ b9ÞwÒNÏ_4Ég³ú=܆‚´ •â¥õeíþkjz>éÚyU«Íӝ݃6"8/ø{=Ô¢»G¥ äUw°W«,ô—¿ãㆅү¢³xŠUû™yŒ (øSópÐ 9\åTâ»—*oG$/×ÍT†Y¿1¤Þ¢_‡ ¼ „±ÍçèSaÓ 3ÛMÁBkxs‰’R/¡¤ˆÙçª(*õ„üXÌ´ƒ E§´¬EF"Ù”R/ÐNyÆÂ^°?™6¡œïJ·±$§?º>ÖüœcNÌù¯G ‹ñ2ŠBB„^·úìaz¨k:#¨Æ¨8LÎõލ£^§S&cŒÐU€ü(‡F±Š¼&P>8ÙÁ ‰ p5?0ÊƃZl¸aô š¼¡}gÿ¶zÆC²¹¬ÎÖG*HB¡O<º2#ñŒAƒ–¡B˜´É$¥›É:FÀÔx¾u?XÜÏÓvN©RS{2ʈãk9rmP¼Qq̳ è¼ÐFׄ^¡Öì fE“F4A…!ì/…¦Lƒ… … $%´¾yã@CI¬ á—3PþBÏNÿ<ý°4Ü ËÃ#ØÍ~âW«rEñw‹eùMMHß²`¬Öó½íf³:‹k˜¯÷}Z!ã¿<¥,\#öµÀ¯aÒNÆIé,Ћ–lŽ#Àæ9ÀÒS·I’½-Ïp Äz¤Š Â* ­íÄ9­< h>׍3ZkËU¹§˜ŒŠ±f­’¤º³Q ÏB?‹#µíÃ¥®@(Gs«†vI¥Mµ‹Á©e~2ú³ÁP4ìÕi‚²Ê^ö@-DþÓàlÜOÍ]n"µã:žpsŽ¢:! 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Current File : /bin/ntpdig
#! /usr/bin/python3 -s
# -*- coding: utf-8 -*-
"""
ntpdig - simple SNTP client

"""
# SPDX-License-Identifier: BSD-2-Clause
# This code runs identically under Python 2 and Python 3. Keep it that way!
from __future__ import print_function, division
import getopt
import math
import select
import socket
import sys
import time

try:
    import ntp.magic
    import ntp.packet
    import ntp.util
except ImportError as e:
    sys.stderr.write(
        "ntpdig: can't find Python NTP library -- check PYTHONPATH.\n")
    sys.stderr.write("%s\n" % e)
    sys.exit(1)
# This code is somewhat stripped down from the legacy C version.  It
# does however have one additional major feature; it can filter
# out falsetickers from multiple samples, like the ntpdate of old,
# rather than just taking the first reply it gets.
#
# Listening to broadcast addresses is not implemented because that is
# impossible to secure. KOD recording is also not implemented, as it
# can too easily be spammed.  Thus, the options -b and -K are not
# implemented.
#
# There are no version 3 NTP servers left, so the -o version for setting
# NTP version has been omitted.
#
# Because ntpdig doesn't use symmetric-peer mode (it never did, and NTPsec has
# abolished that mode because it was a security hazard), there's no need to
# set the packet source port, so -r/--usereservedport has been dropped.
# If this option ever needs to be reinstated, the magic is described here:
# http://stackoverflow.com/questions/2694212/socket-set-source-port-number
# and would be s.bind(('', 123)) right after the socket creation.
#
# The -w/--wait and -W/--nowait options only made sense with asynchronous
# DNS.  Asynchronous DNS was absurd overkill for this application, we are
# not looking up 20,000 hosts here.  It has not been implemented, so neither
# have these options.
#
# Finally, logging to syslog by default was a design error, violating
# Unix principles, that has been fixed. To get this behavior when
# running in a script, redirect standard error to logger(1).
#
# The one new option in this version is -p, borrowed from ntpdate.


def read_append(s, packets, packet, sockaddr):
    d, a = s.recvfrom(1024)
    if debug >= 2:
        ntp.packet.dump_hex_printable(d)
    if credentials:
        if not ntp.packet.Authenticator.have_mac(d):
            if debug:
                log("no MAC on reply from %s" % packet.hostname)
        if not credentials.verify_mac(d, packet_end=48, mac_begin=48):
            packet.trusted = False
            log("MAC verification on reply from %s failed"
                % sockaddr[0])
        elif debug:
            log("MAC verification on reply from %s succeeded"
                % sockaddr[0])
    pkt = ntp.packet.SyncPacket(d)
    pkt.hostname = server
    pkt.resolved = sockaddr[0]
    packets.append(pkt)
    return packets


def queryhost(server, concurrent, timeout=5, port=123):
    "Query IP addresses associated with a specified host."
    try:
        iptuples = socket.getaddrinfo(server, port,
                                      af, socket.SOCK_DGRAM,
                                      socket.IPPROTO_UDP)
    except socket.gaierror as e:
        log("lookup of %s failed, errno %d = %s" % (server, e.args[0], e.args[1]))
        return []
    sockets = []
    packets = []
    request = ntp.packet.SyncPacket()
    request.transmit_timestamp = ntp.packet.SyncPacket.posix_to_ntp(
        time.time())
    packet = request.flatten()
    needgap = (len(iptuples) > 1) and (gap > 0)
    firstloop = True
    for (family, socktype, proto, canonname, sockaddr) in iptuples:
        if needgap and not firstloop:
            time.sleep(gap)
        if firstloop:
            firstloop = False
        if debug:
            log("querying %s (%s)" % (sockaddr[0], server))
        s = socket.socket(family, socktype)
        if keyid and keytype and passwd:
            if debug:
                log("authenticating with %s key %d" % (keytype, keyid))
            mac = ntp.packet.Authenticator.compute_mac(packet,
                                                       keyid, keytype, passwd)
            if mac is None:
                log("MAC generation failed while querying %s" % server)
                raise SystemExit(1)
            else:
                packet += mac
        try:
            s.sendto(packet, sockaddr)
        except socket.error as e:
            if debug:
                log("socket error on transmission: %s" % e)
            continue
        if debug >= 2:
            log("Sent to %s:" % (sockaddr[0],))
            ntp.packet.dump_hex_printable(packet)
        if concurrent:
            sockets.append(s)
        else:
            r, _, _ = select.select([s], [], [], timeout)
            if r:
                read_append(s, packets, packet, sockaddr)
        while sockets:
            r, _, _ = select.select(sockets, [], [], timeout)
            if not r:
                return packets
            for s in sockets:
                read_append(s, packets, packet, sockaddr)
                sockets.remove(s)
    return packets


def clock_select(packets):
    "Select the pick-of-the-litter clock from the samples we've got."
    # This is a slightly simplified version of the filter ntpdate used
    NTP_INFIN = 15          # max stratum, infinity a la Bellman-Ford

    # This first chunk of code is supposed to go through all
    # servers we know about to find the servers that
    # are most likely to succeed. We run through the list
    # doing the sanity checks and trying to insert anyone who
    # looks okay. We are at all times aware that we should
    # only keep samples from the top two strata.
    #
    filtered = []
    for response in packets:
        def drop(msg):
            log("%s: Response dropped: %s" % (response.hostname, msg))
        if response.stratum > NTP_INFIN:
            drop("stratum too high")
            continue
        if response.version() < ntp.magic.NTP_OLDVERSION:
            drop("response version %d is too old" % response.version())
            continue
        if response.mode() != ntp.magic.MODE_SERVER:
            drop("unexpected response mode %d" % response.mode())
            continue
        if response.version() > ntp.magic.NTP_VERSION:
            drop("response version %d is too new" % response.version())
            continue
        if response.stratum == 0:
            # FIXME: Do some kind of semi-useful diagnostic dump here
            drop("stratum 0, probable KOD packet")
            continue
        if response.leap() == "unsync":
            drop("leap not in sync")
            continue
        if not response.trusted:
            drop("request was authenticated but server is untrusted")
            continue
        # Bypass this test if we ever support broadcast-client mode again
        if response.origin_timestamp == 0:
            drop("unexpected response timestamp")
            continue
        filtered.append(response)

    if len(filtered) <= 1:
        return filtered

    # Sort by stratum and other figures of merit
    filtered.sort(key=lambda s: (s.stratum, s.synchd(), s.root_delay))

    # Return the best
    return filtered[:1]


def report(packet, json):
    "Report on the SNTP packet selected for display, and its adjustment."
    say = sys.stdout.write

    packet.posixize()

    # The server's idea of the time
    t = time.localtime(int(packet.transmit_timestamp))
    ms = int(packet.transmit_timestamp * 1000000) % 1000000

    if t.tm_isdst:
        tmoffset = -time.altzone // 60  # In minutes
    else:
        tmoffset = -time.timezone // 60  # In minutes

    # Number of decimal digits of precision indicated by the precision field
    digits = min(6, -int(math.log10(2**packet.precision)))

    date = time.strftime("%Y-%m-%d", t)
    tod = time.strftime("%T", t) + (".%-*d" % (digits, ms)).rstrip()
    sgn = ("%+d" % tmoffset)[0]
    tz = "%s%02d%02d" % (sgn, abs(tmoffset) // 60, tmoffset % 60)

    if json:
        say('{"time":"%sT%s%s","offset":%f,"precision":%f,"host":"%s",'
            '"ip":"%s","stratum":%s,"leap":"%s","adjusted":%s}\n'
            % (date, tod, tz,
               packet.adjust(), packet.synchd(),
               packet.hostname, packet.resolved or packet.hostname,
               packet.stratum, packet.leap(),
               "true" if adjusted else "false"))
    else:
        say("%s %s (%s) %+f +/- %f %s"
            % (date, tod, tz,
               packet.adjust(), packet.synchd(),
               packet.hostname))
        if packet.resolved and packet.resolved != packet.hostname:
            say(" " + packet.resolved)
        say(" s%d %s\n" % (packet.stratum, packet.leap()))


usage = """
USAGE:  ntpdig [-<flag> [<val>] | --<name>[{=| }<val>]]...
                [ hostname-or-IP ...]
  Flg Arg Option-Name     Description
   -4 no  ipv4           Force IPv4 DNS name resolution
                                - prohibits the option 'ipv6'
   -6 no  ipv6           Force IPv6 DNS name resolution
                                - prohibits the option 'ipv4'
   -a Num authentication  Enable authentication with the numbered key
   -c yes concurrent      Hosts to be queried concurrently
   -d no  debug           Increase debug verbosity
   -D yes set-debug-level Set debug verbosity
   -g yes gap             Set gap between requests in milliseconds
   -j no  json            Use JSON output format
   -l Str logfile         Log to specified logfile
                                 - prohibits the option 'syslog'
   -p yes samples         Number of samples to take (default 1)
   -S no  step            Set (step) the time with clock_settime()
                                 - prohibits the option 'step'
   -s no  slew            Set (slew) the time with adjtime()
                                 - prohibits the option 'slew'
   -t Num timeout         Request timeout in seconds (default 5)
   -k Str keyfile         Specify a keyfile. ntpdig will look in this file
                          for the key specified with -a
   -V no version          Output version information and exit
   -h no  help            Display extended usage information and exit
"""


if __name__ == '__main__':
    bin_ver = "ntpsec-1.2.2a"
    if ntp.util.stdversion() != bin_ver:
        sys.stderr.write("Module/Binary version mismatch\n")
        sys.stderr.write("Binary: %s\n" % bin_ver)
        sys.stderr.write("Module: %s\n" % ntp.util.stdversion())
    try:
        try:
            (options, arguments) = getopt.getopt(
                sys.argv[1:],
                "46a:c:dD:g:hjk:l:M:o:p:r:Sst:wWV",
                ["ipv4", "ipv6",
                 "authentication=",
                 "concurrent=",
                 "gap=", "help", "json",
                 "keyfile=", "logfile=",
                 "replay=",
                 "samples=", "steplimit=",
                 "step", "slew",
                 "timeout=",
                 "debug", "set-debug-level=",
                 "version"])
        except getopt.GetoptError as e:
            print(e)
            raise SystemExit(1)
        progname = sys.argv[0]

        logfp = sys.stderr
        log = lambda m: logfp.write("ntpdig: %s\n" % m)

        af = socket.AF_UNSPEC
        authkey = None
        concurrent_hosts = []
        debug = 0
        gap = .05
        json = False
        keyfile = None
        steplimit = 0       # Default is intentionally zero
        samples = 1
        step = False
        slew = False
        timeout = 5
        replay = None
        try:
            for (switch, val) in options:
                if switch in ("-4", "--ipv4"):
                    af = socket.AF_INET
                elif switch in ("-6", "--ipv6"):
                    af = socket.AF_INET6
                elif switch in ("-a", "--authentication"):
                    errmsg = "Error: -a parameter '%s' not a number\n"
                    authkey = ntp.util.safeargcast(val, int, errmsg, usage)
                elif switch in ("-c", "--concurrent"):
                    concurrent_hosts.append(val)
                elif switch in ("-d", "--debug"):
                    debug += 1
                elif switch in ("-D", "--set-debug-level"):
                    errmsg = "Error: -D parameter '%s' not a number\n"
                    debug = ntp.util.safeargcast(val, int, errmsg, usage)
                elif switch in ("-g", "--gap"):
                    errmsg = "Error: -g parameter '%s' not a number\n"
                    gap = ntp.util.safeargcast(val, int, errmsg, usage)
                elif switch in ("-j", "--json"):
                    json = True
                elif switch in ("-k", "--keyfile"):
                    keyfile = val
                elif switch in ("-l", "--logfile"):
                    try:
                        logfp = open(val, "w")
                    except OSError:
                        sys.stderr.write("logfile open of %s failed.\n" % val)
                        raise SystemExit(1)
                elif switch in ("-M", "--steplimit"):
                    errmsg = "Error: -M parameter '%s' not a number\n"
                    steplimit = ntp.util.safeargcast(val, int, errmsg, usage)
                    steplimit /= 1000.0
                elif switch in ("-p", "--samples"):
                    errmsg = "Error: -p parameter '%s' not a number\n"
                    samples = ntp.util.safeargcast(val, int, errmsg, usage)
                    if samples < 1:  # If <1 it won't run at all
                        samples = 1
                elif switch in ('-r', "--replay"):
                    replay = val
                elif switch in ("-S", "--step"):
                    step = True
                elif switch in ("-s", "--slew"):
                    slew = True
                elif switch in ("-t", "--timeout"):
                    errmsg = "Error: -t parameter '%s' not a number\n"
                    timeout = ntp.util.safeargcast(val, int, errmsg, usage)
                elif switch in ("-h", "--help"):
                    print(usage)
                    raise SystemExit(0)
                elif switch in ("-V", "--version"):
                    print("ntpdig %s" % bin_ver)
                    raise SystemExit(0)
                else:
                    sys.stderr.write(
                        "Unknown command line switch or missing argument.\n")
                    sys.stderr.write(usage)
                    raise SystemExit(1)
        except ValueError:
            sys.stderr.write("Invalid argument.\n")
            sys.stderr.write(usage)
            raise SystemExit(1)

        gap /= 1000  # convert to milliseconds

        credentials = keyid = keytype = passwd = None
        try:
            credentials = ntp.packet.Authenticator(keyfile)
        except (OSError, IOError):
            sys.stderr.write("ntpdig: %s nonexistent or unreadable\n" %
                             keyfile)
            raise SystemExit(1)
        if credentials:
            try:
                (keyid, keytype, passwd) = credentials.control(authkey)
            except ValueError:
                # There are no trusted keys.  Barf.
                log("cannot get authentication key")
                raise SystemExit(1)

        if not credentials and authkey and keyfile is None:
            sys.stderr.write("-a option requires -k.\n")
            raise SystemExit(1)

        if not arguments:
            arguments = ["localhost"]

        if replay:
            (pkt, dst) = replay.split(":")
            packet = ntp.packet.SyncPacket(pkt.decode("hex"))
            packet.received = ntp.packet.SyncPacket.posix_to_ntp(float(dst))
            returned = [packet]
        else:
            returned = []
            needgap = (samples > 1) and (gap > 0)
            firstloop = True
            for s in range(samples):
                if needgap and not firstloop:
                    time.sleep(gap)
                if firstloop:
                    firstloop = False
                for server in concurrent_hosts:
                    try:
                        returned += queryhost(server=server,
                                              concurrent=True,
                                              timeout=timeout)
                    except ntp.packet.SyncException as e:
                        log(str(e))
                        continue
                for server in arguments:
                    try:
                        returned += queryhost(server=server,
                                              concurrent=False,
                                              timeout=timeout)
                    except ntp.packet.SyncException as e:
                        log(str(e))
                        continue

            returned = clock_select(returned)

        if returned:
            pkt = returned[0]
            if debug:
                # print(repr(pkt))
                def hexstamp(n):
                    return "%08x.%08x" % (n >> 32, n & 0x00000000ffffffff)
                print("org t1: %s rec t2: %s"
                      % (hexstamp(pkt.t1()), hexstamp(pkt.t2())))
                print("xmt t3: %s dst t4: %s"
                      % (hexstamp(pkt.t3()), hexstamp(pkt.t4())))
            pkt.posixize()
            if debug:
                print("org t1: %f rec t2: %f" % (pkt.t1(), pkt.t2()))
                print("xmt t3: %f dst t4: %f" % (pkt.t3(), pkt.t4()))
                print("rec-org t21: %f  xmt-dst t34: %f"
                      % (pkt.t2() - pkt.t1(), pkt.t3() - pkt.t4()))
            offset = pkt.adjust()
            adjusted = (step and
                        (not slew or (slew and (abs(offset) > steplimit))))
            report(pkt, json)
            # If we can step but we cannot slew, then step.
            # If we can step or slew and |offset| > steplimit, then step.
            rc = True
            ntp.ntpc.setprogname("ntpdig")
            if adjusted:
                rc = ntp.ntpc.step_systime(offset)
            elif slew:
                rc = ntp.ntpc.adj_systime(offset)
            if rc:
                raise SystemExit(0)
            else:
                raise SystemExit(1)
        else:
            log("no eligible servers")
            raise SystemExit(1)
    except KeyboardInterrupt:
        print("")

# end

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