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#! /usr/local/bin/perl -w
#
# $FreeBSD$
# John Hay -- John.Hay@icomtek.csir.co.za / jhay@FreeBSD.org
use Socket;
use Getopt::Std;
use vars qw($opt_n);
$ntpq = "ntpq";
getopts('n');
$dodns = 1;
$dodns = 0 if (defined($opt_n));
$host = shift;
$host ||= "127.0.0.1";
for (;;) {
$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,]+)/);
$refid = $1 if (/refid=([^\s,]+)/);
}
close(PH) || die "$cmd failed";
last if ($stratum == 255);
$offset /= 1000;
$rootdelay /= 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, root distance %f",
$dhost, $stratum, $offset, $rootdelay);
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}$/);
$cmd = "$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 "");
$host = $thost;
}
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