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#! @PATH_PERL@ -w
# John Hay -- John.Hay@icomtek.csir.co.za / jhay@FreeBSD.org
package ntptrace;
use 5.006_000;
use strict;
use lib "@PERLLIBDIR@";
use NTP::Util qw(ntp_read_vars do_dns);
exit run(@ARGV) unless caller;
sub run {
my $opts;
if (!processOptions(\@_, $opts)) {
usage(1);
};
my $dodns = $opts->{numeric} ? 0 : 1;
my $max_hosts = $opts->{'max-hosts'};
my $host = shift || $opts->{host};
my $nb_host = 0;
for (;;) {
$nb_host++;
my %info = get_info($host);
last if not %info;
my $dhost = $host;
if ($dodns) {
my $name = do_dns($host);
$dhost = $name if defined $name;
}
printf "%s: stratum %d, offset %f, synch distance %f",
$dhost, $info{stratum}, $info{offset}, $info{syncdistance};
printf ", refid '%s'", $info{refid} if $info{stratum} == 1;
print "\n";
last if $info{stratum} == 0 || $info{stratum} == 1 ||
$info{stratum} == 16;
last if $info{refid} =~ /^127\.127\.\d{1,3}\.\d{1,3}$/;
last if $nb_host == $max_hosts;
my $next_host = get_next_host($info{peer}, $host);
last if $next_host eq '';
last if $next_host =~ /^127\.127\.\d{1,3}\.\d{1,3}$/;
$host = $next_host;
}
return 0;
}
sub get_info {
my ($host) = @_;
my ($rootdelay, $rootdisp, $info) = (0, 0);
$info = ntp_read_vars(0, [], $host);
return if not defined $info;
return if not exists $info->{stratum};
$info->{offset} /= 1000;
$info->{syncdistance} = ($info->{rootdisp} + ($info->{rootdelay} / 2)) / 1000;
return %$info;
}
sub get_next_host {
my ($peer, $host) = @_;
my $info = ntp_read_vars($peer, [qw(srcadr)], $host);
return if not defined $info;
return $info->{srcadr};
}
@ntptrace_opts@
1;
__END__
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