/usr/bin/ntptrace is in ntp 1:4.2.6.p3+dfsg-1ubuntu3.11.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | #! /usr/bin/perl -w
# John Hay -- John.Hay@icomtek.csir.co.za / jhay@FreeBSD.org
use Socket;
use Getopt::Std;
use vars qw($opt_n $opt_m);
$ntpq = "ntpq";
$Getopt::Std::STANDARD_HELP_VERSION=1;
getopts('nm:');
$dodns = 1;
$dodns = 0 if (defined($opt_n));
$max_hosts = (defined($opt_m) ? $opt_m : 99);
$max_hosts = 0 if ( $max_hosts !~ /^\d+$/ );
$nb_host = 1;
$host = shift;
$host ||= "127.0.0.1";
for (;;) {
$nb_host++;
$rootdelay = 0;
$rootdispersion = 0;
$stratum = 255;
$cmd = "$ntpq -n -c rv $host";
open(PH, $cmd . "|") || die "failed to start command $cmd: $!";
while (<PH>) {
$stratum = $1 if (/stratum=(\d+)/);
$peer = $1 if (/peer=(\d+)/);
# Very old servers report phase and not offset.
$offset = $1 if (/(?:offset|phase)=([^\s,]+)/);
$rootdelay = $1 if (/rootdelay=([^\s,]+)/);
$rootdispersion = $1 if (/rootdispersion=([^\s,]+)/);
$refid = $1 if (/refid=([^\s,]+)/);
}
close(PH) || die "$cmd failed";
last if ($stratum == 255);
$offset /= 1000;
$syncdistance = ($rootdispersion + ($rootdelay / 2)) / 1000;
$dhost = $host;
# Only do lookups of IPv4 addresses. The standard lookup functions
# of perl only do IPv4 and I don't know if we should require extras.
if ($dodns && $host =~ /^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/) {
$iaddr = inet_aton($host);
$name = (gethostbyaddr($iaddr, AF_INET))[0];
$dhost = $name if (defined($name));
}
printf("%s: stratum %d, offset %f, synch distance %f",
$dhost, $stratum, $offset, $syncdistance);
printf(", refid '%s'", $refid) if ($stratum == 1);
printf("\n");
last if ($stratum == 0 || $stratum == 1 || $stratum == 16);
last if ($refid =~ /^127\.127\.\d{1,3}\.\d{1,3}$/);
last if ($nb_host > $max_hosts);
$cmd = "$ntpq -n -c \"pstat $peer\" $host";
open(PH, $cmd . "|") || die "failed to start command $cmd: $!";
$thost = "";
while (<PH>) {
$thost = $1, last if (/srcadr=(\S+),/);
}
close(PH) || die "$cmd failed";
last if ($thost eq "");
last if ($thost =~ /^127\.127\.\d{1,3}\.\d{1,3}$/);
$host = $thost;
}
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