NetBSD/dist/ntp/scripts/checktime.in

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#! @PATH_PERL@
#! @PATH_PERL@ -d
#
# This script compares the time of several machines with the
# time on the local host.
#
# Use or modify it as you wish.
#
# As the original author is only expecting 14 minutes of fame,
# leaving his name attached would be appreciated.
#
# R. Gary Cutbill <rgary@chrysalis.com>
# 21 April 1999
#
$tol=2.0;
$|=1;
print "Time Check";
open(HOSTS,"ypcat hosts.byaddr |"); # get a list of hosts from the yp server.
while ($line=<HOSTS>) { # loop for each host getting the offset compared to localhost
($addr,$host,$aliases)=split(/\s+/,$line,3);
$res=`/usr/local/bin/ntptrace -m 1 -r 1 -t 1 $host`;
print ".";
chop $res;
push (@results,$res);
}
print "\n";
#
# Sort the list of hosts, and print out there offsets
# from the local host.
#
@list=sort appropriately @results;
foreach $i ( @list ) {
@dargs=split(/\s+/,$i);
if ( $dargs[1] eq "\*Timeout\*" ) {
print "$i\n";
chop $dargs[0];
push(@down,$dargs[0]);
} else {
printf "%-25s %7s %3s %6s %10s %5s %8s %8s\n",@dargs;
if ( ( $dargs[4] > $tol ) || ( $dargs[4] < -$tol ) ) {
chop $dargs[0];
push(@toofarout,$dargs[0]); }
}
}
#
# When the above list finishes, hosts that are different by +/- $tol (two seconds)
# are in @toofarout. Hosts that are down are in @down. They are treated the same
# way here, but you might want to do something different depending on your site.
#
# print a set of suggested rsh commands to run on the hosts that
# don't have "good" time. "restartntp" is left as an excersize to the reader.
# I usually use it to kill a running xntpd, ntpdate some server, and the start xntp
# again.
#
print "\nConsider:\n";
foreach $i ( (@down,@toofarout) ) {
print " rsh $i sudo restartntp\n";
}
#
# sort the results from the list. First by stratum, then by time deviation
# Put hosts that didn't respond (timed out) on the bottom.
#
sub appropriately {
@af=split(/\s+/,$a);
@bf=split(/\s+/,$b);
$aba= ($af[4]<0)?-$af[4]:$af[4];
$abb= ($bf[4]<0)?-$bf[4]:$bf[4];
( $af[1] ne $bf[1] ) ? $bf[1] cmp $af[1] :
( ( $af[2] != $bf[2] ) ? ( $bf[2] <=> $af[2] ) :
( ( $aba != $abb ) ? ( $abb <=> $aba ) : ($af[0] cmp $bf[0] ) ) );
}