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62 lines
1.6 KiB
Perl
62 lines
1.6 KiB
Perl
#! /usr/local/bin/perl -w
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#
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# John Hay -- John.Hay@icomtek.csir.co.za / jhay@FreeBSD.org
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use Socket;
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use Getopt::Std;
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use vars qw($opt_n);
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$ntpq = "ntpq";
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getopts('n');
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$dodns = 1;
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$dodns = 0 if (defined($opt_n));
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$host = shift;
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$host ||= "127.0.0.1";
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for (;;) {
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$stratum = 255;
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$cmd = "$ntpq -n -c rv $host";
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open(PH, $cmd . "|") || die "failed to start command $cmd: $!";
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while (<PH>) {
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$stratum = $1 if (/stratum=(\d+)/);
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$peer = $1 if (/peer=(\d+)/);
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# Very old servers report phase and not offset.
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$offset = $1 if (/(?:offset|phase)=([^\s,]+)/);
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$rootdelay = $1 if (/rootdelay=([^\s,]+)/);
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$refid = $1 if (/refid=([^\s,]+)/);
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}
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close(PH) || die "$cmd failed";
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last if ($stratum == 255);
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$offset /= 1000;
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$rootdelay /= 1000;
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$dhost = $host;
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# Only do lookups of IPv4 addresses. The standard lookup functions
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# of perl only do IPv4 and I don't know if we should require extras.
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if ($dodns && $host =~ /^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/) {
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$iaddr = inet_aton($host);
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$name = (gethostbyaddr($iaddr, AF_INET))[0];
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$dhost = $name if (defined($name));
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}
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printf("%s: stratum %d, offset %f, root distance %f",
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$dhost, $stratum, $offset, $rootdelay);
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printf(", refid '%s'", $refid) if ($stratum == 1);
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printf("\n");
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last if ($stratum == 0 || $stratum == 1 || $stratum == 16);
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last if ($refid =~ /^127\.127\.\d{1,3}\.\d{1,3}$/);
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$cmd = "$ntpq -n -c \"pstat $peer\" $host";
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open(PH, $cmd . "|") || die "failed to start command $cmd: $!";
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$thost = "";
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while (<PH>) {
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$thost = $1, last if (/srcadr=(\S+),/);
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}
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close(PH) || die "$cmd failed";
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last if ($thost eq "");
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$host = $thost;
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}
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