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