| 1 | #!/usr/bin/perl -w |
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| 2 | # --*-perl-*- |
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| 3 | ;# |
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| 4 | ;# ntploopstat,v 3.1 1993/07/06 01:09:11 jbj Exp |
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| 5 | ;# |
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| 6 | ;# Poll NTP server using NTP mode 7 loopinfo request. |
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| 7 | ;# Log info and timestamp to file for processing by ntploopwatch. |
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| 8 | ;# |
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| 9 | ;# |
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| 10 | ;# Copyright (c) 1992 |
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| 11 | ;# Rainer Pruy Friedrich-Alexander Universitaet Erlangen-Nuernberg |
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| 12 | ;# |
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| 13 | ;################################################################# |
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| 14 | ;# |
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| 15 | ;# The format written to the logfile is the same as used by xntpd |
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| 16 | ;# for the loopstats file. |
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| 17 | ;# This script however allows to gather loop filter statistics from |
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| 18 | ;# remote servers where you do not have access to the loopstats logfile. |
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| 19 | ;# |
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| 20 | ;# Please note: Communication delays affect the accuracy of the |
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| 21 | ;# timestamps recorded. Effects from these delays will probably |
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| 22 | ;# not show up, as timestamps are recorded to the second only. |
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| 23 | ;# (Should have implemented &gettimeofday()..) |
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| 24 | ;# |
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| 25 | |
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| 26 | $0 =~ s!^.*/([^/]+)$!$1!; # beautify script name |
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| 27 | |
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| 28 | $ntpserver = 'localhost'; # default host to poll |
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| 29 | $delay = 60; # default sampling rate |
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| 30 | ;# keep it shorter than minpoll (=64) |
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| 31 | ;# to get all values |
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| 32 | |
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| 33 | require "ctime.pl"; |
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| 34 | ;# handle bug in early ctime distributions |
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| 35 | $ENV{'TZ'} = 'MET' unless defined($ENV{'TZ'}) || $] > 4.010; |
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| 36 | |
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| 37 | if (defined(@ctime'MoY)) |
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| 38 | { |
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| 39 | *MonthName = *ctime'MoY; |
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| 40 | } |
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| 41 | else |
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| 42 | { |
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| 43 | @MonthName = ('Jan','Feb','Mar','Apr','May','Jun', |
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| 44 | 'Jul','Aug','Sep','Oct','Nov','Dec'); |
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| 45 | } |
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| 46 | |
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| 47 | ;# this routine can be redefined to point to syslog if necessary |
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| 48 | sub msg |
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| 49 | { |
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| 50 | return unless $verbose; |
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| 51 | |
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| 52 | print STDERR "$0: "; |
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| 53 | printf STDERR @_; |
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| 54 | } |
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| 55 | |
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| 56 | ;############################################################# |
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| 57 | ;# |
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| 58 | ;# process command line |
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| 59 | $usage = <<"E-O-S"; |
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| 60 | |
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| 61 | usage: |
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| 62 | $0 [-d<delay>] [-t<timeout>] [-l <logfile>] [-v] [ntpserver] |
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| 63 | E-O-S |
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| 64 | |
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| 65 | while($_ = shift) |
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| 66 | { |
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| 67 | /^-v(\d*)$/ && ($verbose=($1 eq '') ? 1 : $1,1) && next; |
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| 68 | /^-d(\d*)$/ && |
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| 69 | do { |
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| 70 | ($1 ne '') && ($delay = $1,1) && next; |
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| 71 | @ARGV || die("$0: delay value missing after -d\n$usage"); |
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| 72 | $delay = shift; |
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| 73 | ($delay >= 0) || die("$0: bad delay value \"$delay\"\n$usage"); |
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| 74 | next; |
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| 75 | }; |
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| 76 | /^-l$/ && |
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| 77 | do { |
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| 78 | @ARGV || die("$0: logfile missing after -l\n$usage"); |
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| 79 | $logfile = shift; |
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| 80 | next; |
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| 81 | }; |
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| 82 | /^-t(\d*(\.\d*)?)$/ && |
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| 83 | do { |
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| 84 | ($1 ne '') && ($timeout = $1,1) && next; |
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| 85 | @ARGV || die("$0: timeout value missing after -t\n$usage\n"); |
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| 86 | $timeout = shift; |
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| 87 | ($timeout > 0) || |
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| 88 | die("$0: bad timeout value \"$timeout\"\n$usage"); |
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| 89 | next; |
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| 90 | }; |
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| 91 | |
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| 92 | /^-/ && die("$0: unknown option \"$_\"\n$usage"); |
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| 93 | |
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| 94 | ;# any other argument is server to poll |
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| 95 | $ntpserver = $_; |
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| 96 | last; |
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| 97 | } |
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| 98 | |
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| 99 | if (@ARGV) |
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| 100 | { |
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| 101 | warn("unexpected arguments: ".join(" ",@ARGV).".\n"); |
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| 102 | die("$0: too many servers specified\n$usage"); |
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| 103 | } |
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| 104 | |
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| 105 | ;# logfile defaults to include server name |
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| 106 | ;# The name of the current month is appended and |
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| 107 | ;# the file is opened and closed for each sample. |
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| 108 | ;# |
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| 109 | $logfile = "loopstats:$ntpserver." unless defined($logfile); |
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| 110 | $timeout = 12.0 unless defined($timeout); # wait $timeout seconds for reply |
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| 111 | |
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| 112 | $MAX_FAIL = 60; # give up after $MAX_FAIL failed polls |
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| 113 | |
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| 114 | |
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| 115 | $MJD_1970 = 40587; |
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| 116 | |
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| 117 | if (eval 'require "syscall.ph";') |
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| 118 | { |
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| 119 | if (defined(&SYS_gettimeofday)) |
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| 120 | { |
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| 121 | ;# assume standard |
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| 122 | ;# gettimeofday(struct timeval *tp,struct timezone *tzp) |
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| 123 | ;# syntax for gettimeofday syscall |
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| 124 | ;# tzp = NULL -> undef |
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| 125 | ;# tp = (long,long) |
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| 126 | eval 'sub time { local($tz) = pack("LL",0,0); |
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| 127 | (&msg("gettimeofday failed: $!\n"), |
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| 128 | return (time)) |
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| 129 | unless syscall(&SYS_gettimeofday,$tz,undef) == 0; |
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| 130 | local($s,$us) = unpack("LL",$tz); |
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| 131 | return $s + $us/1000000; }'; |
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| 132 | local($t1,$t2,$t3); |
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| 133 | $t1 = time; |
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| 134 | eval '$t2 = &time;'; |
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| 135 | $t3 = time; |
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| 136 | die("$0: gettimeofday failed: $@.\n") if defined($@) && $@; |
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| 137 | die("$0: gettimeofday inconsistency time=$t1,gettimeofday=$t2,time=$t2\n") |
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| 138 | if (int($t1) != int($t2) && int($t3) != int($t2)); |
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| 139 | &msg("Using gettimeofday for timestamps\n"); |
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| 140 | } |
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| 141 | else |
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| 142 | { |
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| 143 | warn("No gettimeofday syscall found - using time builtin for timestamps\n"); |
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| 144 | eval 'sub time { return time; }'; |
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| 145 | } |
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| 146 | } |
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| 147 | else |
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| 148 | { |
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| 149 | warn("No syscall.ph file found - using time builtin for timestamps\n"); |
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| 150 | eval 'sub time { return time; }'; |
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| 151 | } |
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| 152 | |
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| 153 | |
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| 154 | ;#------------------+ |
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| 155 | ;# from ntp_request.h |
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| 156 | ;#------------------+ |
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| 157 | |
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| 158 | ;# NTP mode 7 packet format: |
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| 159 | ;# Byte 1: ResponseBit MoreBit Version(3bit) Mode(3bit)==7 |
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| 160 | ;# Byte 2: AuthBit Sequence # - 0 - 127 see MoreBit |
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| 161 | ;# Byte 3: Implementation # |
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| 162 | ;# Byte 4: Request Code |
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| 163 | ;# |
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| 164 | ;# Short 1: Err(3bit) NumItems(12bit) |
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| 165 | ;# Short 2: MBZ(3bit)=0 DataItemSize(12bit) |
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| 166 | ;# 0 - 500 byte Data |
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| 167 | ;# if AuthBit is set: |
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| 168 | ;# Long: KeyId |
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| 169 | ;# 2xLong: AuthCode |
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| 170 | |
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| 171 | ;# |
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| 172 | $IMPL_XNTPD = 2; |
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| 173 | $REQ_LOOP_INFO = 8; |
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| 174 | |
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| 175 | |
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| 176 | ;# request packet for REQ_LOOP_INFO: |
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| 177 | ;# B1: RB=0 MB=0 V=2 M=7 |
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| 178 | ;# B2: S# = 0 |
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| 179 | ;# B3: I# = IMPL_XNTPD |
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| 180 | ;# B4: RC = REQ_LOOP_INFO |
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| 181 | ;# S1: E=0 NI=0 |
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| 182 | ;# S2: MBZ=0 DIS=0 |
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| 183 | ;# data: 32 byte 0 padding |
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| 184 | ;# 8byte timestamp if encryption, 0 padding otherwise |
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| 185 | $loopinfo_reqpkt = |
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| 186 | pack("CCCC nn x32 x8", 0x17, 0, $IMPL_XNTPD, $REQ_LOOP_INFO, 0, 0); |
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| 187 | |
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| 188 | ;# ignore any auth data in packets |
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| 189 | $loopinfo_response_size = |
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| 190 | 1+1+1+1+2+2 # header size like request pkt |
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| 191 | + 8 # l_fp last_offset |
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| 192 | + 8 # l_fp drift_comp |
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| 193 | + 4 # u_long compliance |
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| 194 | + 4 # u_long watchdog_timer |
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| 195 | ; |
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| 196 | $loopinfo_response_fmt = "C4n2N2N2NN"; |
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| 197 | $loopinfo_response_fmt_v2 = "C4n2N2N2N2N"; |
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| 198 | |
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| 199 | ;# |
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| 200 | ;# prepare connection to server |
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| 201 | ;# |
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| 202 | |
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| 203 | ;# workaround for broken socket.ph on dynix_ptx |
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| 204 | eval 'sub INTEL {1;}' unless defined(&INTEL); |
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| 205 | eval 'sub ATT {1;}' unless defined(&ATT); |
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| 206 | |
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| 207 | require "sys/socket.ph"; |
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| 208 | |
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| 209 | require 'netinet/in.ph'; |
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| 210 | |
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| 211 | ;# if you do not have netinet/in.ph enable the following lines |
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| 212 | ;#eval 'sub INADDR_ANY { 0x00000000; }' unless defined(&INADDR_ANY); |
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| 213 | ;#eval 'sub IPPRORO_UDP { 17; }' unless defined(&IPPROTO_UDP); |
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| 214 | |
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| 215 | if ($ntpserver =~ /^((0x?)?\w+)\.((0x?)?\w+)\.((0x?)?\w+)\.((0x?)?\w+)$/) |
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| 216 | { |
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| 217 | local($a,$b,$c,$d) = ($1,$3,$5,$7); |
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| 218 | $a = oct($a) if defined($2); |
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| 219 | $b = oct($b) if defined($4); |
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| 220 | $c = oct($c) if defined($6); |
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| 221 | $d = oct($d) if defined($8); |
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| 222 | $server_addr = pack("C4", $a,$b,$c,$d); |
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| 223 | |
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| 224 | $server_mainname |
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| 225 | = (gethostbyaddr($server_addr,&AF_INET))[$[] || $ntpserver; |
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| 226 | } |
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| 227 | else |
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| 228 | { |
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| 229 | ($server_mainname,$server_addr) |
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| 230 | = (gethostbyname($ntpserver))[$[,$[+4]; |
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| 231 | |
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| 232 | die("$0: host \"$ntpserver\" is unknown\n") |
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| 233 | unless defined($server_addr); |
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| 234 | } |
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| 235 | &msg ("Address of server \"$ntpserver\" is \"%d.%d.%d.%d\"\n", |
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| 236 | unpack("C4",$server_addr)); |
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| 237 | |
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| 238 | $proto_udp = (getprotobyname('udp'))[$[+2] || &IPPROTO_UDP; |
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| 239 | |
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| 240 | $ntp_port = |
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| 241 | (getservbyname('ntp','udp'))[$[+2] || |
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| 242 | (warn "Could not get port number for service \"ntp/udp\" using 123\n"), |
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| 243 | ($ntp_port=123); |
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| 244 | |
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| 245 | ;# |
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| 246 | 0 && &SOCK_DGRAM; # satisfy perl -w ... |
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| 247 | socket(S, &AF_INET, &SOCK_DGRAM, $proto_udp) || |
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| 248 | die("Cannot open socket: $!\n"); |
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| 249 | |
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| 250 | bind(S, pack("S n N x8", &AF_INET, 0, &INADDR_ANY)) || |
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| 251 | die("Cannot bind: $!\n"); |
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| 252 | |
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| 253 | ($my_port, $my_addr) = (unpack("S n a4 x8",getsockname(S)))[$[+1,$[+2]; |
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| 254 | |
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| 255 | &msg("Listening at address %d.%d.%d.%d port %d\n", |
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| 256 | unpack("C4",$my_addr), $my_port); |
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| 257 | |
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| 258 | $server_inaddr = pack("Sna4x8", &AF_INET, $ntp_port, $server_addr); |
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| 259 | |
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| 260 | ;############################################################ |
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| 261 | ;# |
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| 262 | ;# the main loop: |
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| 263 | ;# send request |
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| 264 | ;# get reply |
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| 265 | ;# wait til next sample time |
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| 266 | |
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| 267 | undef($lasttime); |
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| 268 | $lostpacket = 0; |
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| 269 | |
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| 270 | while(1) |
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| 271 | { |
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| 272 | $stime = &time; |
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| 273 | |
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| 274 | &msg("Sending request $stime...\n"); |
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| 275 | |
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| 276 | $ret = send(S,$loopinfo_reqpkt,0,$server_inaddr); |
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| 277 | |
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| 278 | if (! defined($ret) || $ret < length($loopinfo_reqpkt)) |
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| 279 | { |
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| 280 | warn("$0: send failed ret=($ret): $!\n"); |
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| 281 | $fail++; |
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| 282 | next; |
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| 283 | } |
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| 284 | |
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| 285 | &msg("Waiting for reply...\n"); |
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| 286 | |
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| 287 | $mask = ""; vec($mask,fileno(S),1) = 1; |
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| 288 | $ret = select($mask,undef,undef,$timeout); |
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| 289 | |
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| 290 | if (! defined($ret)) |
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| 291 | { |
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| 292 | warn("$0: select failed: $!\n"); |
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| 293 | $fail++; |
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| 294 | next; |
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| 295 | } |
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| 296 | elsif ($ret == 0) |
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| 297 | { |
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| 298 | warn("$0: request to $ntpserver timed out ($timeout seconds)\n"); |
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| 299 | ;# do not count this event as failure |
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| 300 | ;# it usually this happens due to dropped udp packets on noisy and |
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| 301 | ;# havily loaded lines, so just try again; |
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| 302 | $lostpacket = 1; |
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| 303 | next; |
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| 304 | } |
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| 305 | |
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| 306 | &msg("Receiving reply...\n"); |
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| 307 | |
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| 308 | $len = 520; # max size of a mode 7 packet |
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| 309 | $reply = ""; # just make it defined for -w |
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| 310 | $ret = recv(S,$reply,$len,0); |
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| 311 | |
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| 312 | if (!defined($ret)) |
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| 313 | { |
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| 314 | warn("$0: recv failed: $!\n"); |
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| 315 | $fail++; |
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| 316 | next; |
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| 317 | } |
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| 318 | |
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| 319 | $etime = &time; |
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| 320 | &msg("Received at\t$etime\n"); |
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| 321 | |
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| 322 | ;#$time = ($stime + $etime) / 2; # symmetric delay assumed |
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| 323 | $time = $etime; # the above assumption breaks for X25 |
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| 324 | ;# so taking etime makes timestamps be a |
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| 325 | ;# little late, but keeps them increasing |
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| 326 | ;# monotonously |
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| 327 | |
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| 328 | &msg(sprintf("Reply from %d.%d.%d.%d took %f seconds\n", |
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| 329 | (unpack("SnC4",$ret))[$[+2 .. $[+5], ($etime - $stime))); |
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| 330 | |
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| 331 | if ($len < $loopinfo_response_size) |
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| 332 | { |
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| 333 | warn("$0: short packet ($len bytes) received ($loopinfo_response_size bytes expected\n"); |
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| 334 | $fail++; |
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| 335 | next; |
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| 336 | } |
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| 337 | |
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| 338 | ($b1,$b2,$b3,$b4,$s1,$s2, |
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| 339 | $offset_i,$offset_f,$drift_i,$drift_f,$compl,$watchdog) |
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| 340 | = unpack($loopinfo_response_fmt,$reply); |
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| 341 | |
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| 342 | ;# check reply |
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| 343 | if (($s1 >> 12) != 0) # error ! |
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| 344 | { |
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| 345 | die("$0: got error reply ".($s1>>12)."\n"); |
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| 346 | } |
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| 347 | if (($b1 != 0x97 && $b1 != 0x9f) || # Reply NotMore V=2 M=7 |
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| 348 | ($b2 != 0 && $b2 != 0x80) || # S=0 Auth no/yes |
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| 349 | $b3 != $IMPL_XNTPD || # ! IMPL_XNTPD |
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| 350 | $b4 != $REQ_LOOP_INFO || # Ehh.. not loopinfo reply ? |
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| 351 | $s1 != 1 || # ???? |
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| 352 | ($s2 != 24 && $s2 != 28) # |
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| 353 | ) |
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| 354 | { |
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| 355 | warn("$0: Bad/unexpected reply from server:\n"); |
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| 356 | warn(" \"".unpack("H*",$reply)."\"\n"); |
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| 357 | warn(" ".sprintf("b1=%x b2=%x b3=%x b4=%x s1=%d s2=%d\n", |
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| 358 | $b1,$b2,$b3,$b4,$s1,$s2)); |
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| 359 | $fail++; |
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| 360 | next; |
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| 361 | } |
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| 362 | elsif ($s2 == 28) |
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| 363 | { |
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| 364 | ;# seems to be a version 2 xntpd |
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| 365 | ($b1,$b2,$b3,$b4,$s1,$s2, |
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| 366 | $offset_i,$offset_f,$drift_i,$drift_f,$compl_i,$compl_f,$watchdog) |
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| 367 | = unpack($loopinfo_response_fmt_v2,$reply); |
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| 368 | $compl = &lfptoa($compl_i, $compl_f); |
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| 369 | } |
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| 370 | |
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| 371 | $time -= $watchdog; |
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| 372 | |
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| 373 | $offset = &lfptoa($offset_i, $offset_f); |
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| 374 | $drift = &lfptoa($drift_i, $drift_f); |
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| 375 | |
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| 376 | &log($time,$offset,$drift,$compl) && ($fail = 0);; |
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| 377 | } |
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| 378 | continue |
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| 379 | { |
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| 380 | die("$0: Too many failures - terminating\n") if $fail > $MAX_FAIL; |
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| 381 | &msg("Sleeping " . ($lostpacket ? ($delay / 2) : $delay) . " seconds...\n"); |
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| 382 | |
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| 383 | sleep($lostpacket ? ($delay / 2) : $delay); |
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| 384 | $lostpacket = 0; |
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| 385 | } |
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| 386 | |
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| 387 | sub log |
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| 388 | { |
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| 389 | local($time,$offs,$freq,$cmpl) = @_; |
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| 390 | local($y,$m,$d); |
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| 391 | local($fname,$suff) = ($logfile); |
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| 392 | |
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| 393 | |
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| 394 | ;# silently drop sample if distance to last sample is too low |
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| 395 | if (defined($lasttime) && ($lasttime + 2) >= $time) |
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| 396 | { |
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| 397 | &msg("Dropped packet - old sample\n"); |
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| 398 | return 1; |
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| 399 | } |
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| 400 | |
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| 401 | ;# $suff determines which samples end up in the same file |
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| 402 | ;# could have used $year (;-) or WeekOfYear, DayOfYear,.... |
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| 403 | ;# Change it to your suit... |
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| 404 | |
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| 405 | ($d,$m,$y) = (localtime($time))[$[+3 .. $[+5]; |
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| 406 | $suff = sprintf("%04d%02d%02d",$y+1900,$m+1,$d); |
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| 407 | $fname .= $suff; |
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| 408 | if (!open(LOG,">>$fname")) |
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| 409 | { |
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| 410 | warn("$0: open($fname) failed: $!\n"); |
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| 411 | $fail++; |
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| 412 | return 0; |
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| 413 | } |
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| 414 | else |
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| 415 | { |
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| 416 | ;# file format |
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| 417 | ;# MJD seconds offset drift compliance |
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| 418 | printf LOG ("%d %.3lf %.8lf %.7lf %d\n", |
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| 419 | int($time/86400)+$MJD_1970, |
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| 420 | $time - int($time/86400) * 86400, |
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| 421 | $offs,$freq,$cmpl); |
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| 422 | close(LOG); |
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| 423 | $lasttime = $time; |
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| 424 | } |
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| 425 | return 1; |
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| 426 | } |
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| 427 | |
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| 428 | ;# see ntp_fp.h to understand this |
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| 429 | sub lfptoa |
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| 430 | { |
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| 431 | local($i,$f) = @_; |
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| 432 | local($sign) = 1; |
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| 433 | |
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| 434 | |
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| 435 | if ($i & 0x80000000) |
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| 436 | { |
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| 437 | if ($f == 0) |
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| 438 | { |
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| 439 | $i = -$i; |
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| 440 | } |
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| 441 | else |
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| 442 | { |
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| 443 | $f = -$f; |
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| 444 | $i = ~$i; |
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| 445 | $i += 1; # 2s complement |
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| 446 | } |
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| 447 | $sign = -1; |
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| 448 | ;#print "NEG: $i $f\n"; |
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| 449 | } |
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| 450 | else |
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| 451 | { |
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| 452 | ;#print "POS: $i $f\n"; |
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| 453 | } |
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| 454 | ;# unlike xntpd I have perl do the dirty work. |
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| 455 | ;# Using floats here may affect precision, but |
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| 456 | ;# currently these bits aren't significant anyway |
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| 457 | return $sign * ($i + $f/2**32); |
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| 458 | } |
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