#! /usr/pkg/bin/perl -w # 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 () { $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 () { $thost = $1, last if (/srcadr=(\S+),/); } close(PH) || die "$cmd failed"; last if ($thost eq ""); $host = $thost; }