#! @PATH_PERL@ -w
#
# $Id$
#
# DISCLAIMER
#
# Copyright (C) 1999,2000 Hans Lambermont and Origin B.V.
#
# Permission to use, copy, modify and distribute this software and its
# documentation for any purpose and without fee is hereby granted,
# provided that the above copyright notice appears in all copies and
# that both the copyright notice and this permission notice appear in
# supporting documentation. This software is supported as is and without
# any express or implied warranties, including, without limitation, the
# implied warranties of merchantability and fitness for a particular
# purpose. The name Origin B.V. must not be used to endorse or promote
# products derived from this software without prior written permission.
#
# Hans Lambermont <Hans.Lambermont@nl.origin-it.com>/<H.Lambermont@chello.nl>
# 14 Jan 2000
require 5.0; # But actually tested on 5.004 ;)
use Getopt::Long; # GetOptions()
use strict;
my $version = 1.3;
(my $program = $0) =~ s%.*/(.+?)(.pl)?$%$1%;
# Hardcoded paths/program names
my $ntpdate = "ntpdate";
my $ntpq = "ntpq";
# no STDOUT buffering
$| = 1;
my ($help, $single_host, $showpeers, $maxlevel, $strip, $askversion);
my $res = GetOptions("help!" => \$help,
"host=s" => \$single_host,
"peers!" => \$showpeers,
"maxlevel=s" => \$maxlevel,
"strip=s" => \$strip,
"version!" => \$askversion);
if ($askversion) {
print("$version\n");
exit 0;
}
if ($help || ((@ARGV != 1) && !$single_host)) {
warn <<EOF;
This is $program, version $version
Copyright (C) 1999,2000 Hans Lambermont and Origin B.V. Disclaimer inside.
Usage:
$program [--help|--peers|--strip <string>|--maxlevel <level>|--version] \\
<file>|[--host <hostname>]
Description:
$program prints per host given in <file> the NTP stratum level, the
clock offset in seconds, the daemon version, the operating system and
the processor. Optionally recursing through all peers.
Options:
--help
Print this short help text and exit.
--version
Print version ($version) and exit.
<file>
Specify hosts file. File format is one hostname or ip number per line.
Lines beginning with # are considered as comment.
--host <hostname>
Speficy a single host, bypassing the need for a hosts file.
--peers
Recursively list all peers a host synchronizes to.
An '= ' before a peer means a loop. Recursion stops here.
--maxlevel <level>
Traverse peers up to this level (4 is a reasonable number).
--strip <string>
Strip <string> from hostnames.
Examples:
$program myhosts.txt --strip .foo.com
$program --host some.host --peers --maxlevel 4
EOF
exit 1;
}
my $hostsfile = shift;
my (@hosts, @known_hosts);
my (%known_host_info, %known_host_peers);
sub read_hosts()
{
local *HOSTS;
open (HOSTS, $hostsfile) ||
die "$program: FATAL: unable to read $hostsfile: $!\n";
while (<HOSTS>) {
next if /^\s*(#|$)/; # comment/empty
chomp;
push(@hosts, $_);
}
close(HOSTS);
}
# translate IP to hostname if possible
sub ip2name {
my($ip) = @_;
my($addr, $name, $aliases, $addrtype, $length, @addrs);
$addr = pack('C4', split(/\./, $ip));
($name, $aliases, $addrtype, $length, @addrs) = gethostbyaddr($addr, 2);
if ($name) {
# return lower case name
return("\L$name");
} else {
return($ip);
}
}
# item_in_list($item, @list): returns 1 if $item is in @list, 0 if not
sub item_in_list {
my($item, @list) = @_;
my($i);
foreach $i (@list) {
return 1 if ($item eq $i);
}
return 0;
}
sub scan_host($;$;$) {
my($host, $level, @trace) = @_;
my $stratum = 0;
my $offset = 0;
my $daemonversion = "";
my $system = "";
my $processor = "";
my @peers;
my $known_host = 0;
if (&item_in_list($host, @known_hosts)) {
$known_host = 1;
} else {
# ntpdate part
open(NTPDATE, "$ntpdate -bd $host 2>/dev/null |") ||
die "Cannot open ntpdate pipe: $!\n";
while (<NTPDATE>) {
/^stratum\s+(\d+).*$/ && do {
$stratum = $1;
};
/^offset\s+([0-9.-]+)$/ && do {
$offset = $1;
};
}
close(NTPDATE);
# got answers ? If so, go on.
if ($stratum) {
# ntpq part
my $ntpqparams = "-c 'rv 0 processor,system,daemon_version'";
open(NTPQ, "$ntpq $ntpqparams $host 2>/dev/null |") ||
die "Cannot open ntpq pipe: $!\n";
while (<NTPQ>) {
/daemon_version="(.*)"/ && do {
$daemonversion = $1;
};
/system="([^"]*)"/ && do {
$system = $1;
};
/processor="([^"]*)"/ && do {
$processor = $1;
};
}
close(NTPQ);
# Shorten daemon_version string.
$daemonversion =~ s/(;|Mon|Tue|Wed|Thu|Fri|Sat|Sun).*$//;
$daemonversion =~ s/version=//;
$daemonversion =~ s/(x|)ntpd //;
$daemonversion =~ s/(\(|\))//g;
$daemonversion =~ s/beta/b/;
$daemonversion =~ s/multicast/mc/;
# Shorten system string
$system =~ s/UNIX\///;
$system =~ s/RELEASE/r/;
$system =~ s/CURRENT/c/;
# Shorten processor string
$processor =~ s/unknown//;
}
# got answers ? If so, go on.
if ($daemonversion) {
# ntpq again, find out the peers this time
if ($showpeers) {
my $ntpqparams = "-pn";
open(NTPQ, "$ntpq $ntpqparams $host 2>/dev/null |") ||
die "Cannot open ntpq pipe: $!\n";
while (<NTPQ>) {
/^No association ID's returned$/ && do {
last;
};
/^ remote/ && do {
next;
};
/^==/ && do {
next;
};
/^( |x|\.|-|\+|#|\*|o)([^ ]+)/ && do {
push(@peers, ip2name($2));
next;
};
print "ERROR: $_";
}
close(NTPQ);
}
}
# Add scanned host to known_hosts array
push(@known_hosts, $host);
if ($stratum) {
$known_host_info{$host} = sprintf("%2d %9.3f %-11s %-12s %s",
$stratum, $offset, substr($daemonversion,0,11),
substr($system,0,12), substr($processor,0,9));
} else {
# Stratum level 0 is consider invalid
$known_host_info{$host} = sprintf(" ?");
}
$known_host_peers{$host} = [@peers];
}
if ($stratum || $known_host) { # Valid or known host
my $printhost = ' ' x $level . $host;
# Shorten host string
if ($strip) {
$printhost =~ s/$strip//;
}
# append number of peers in brackets if requested and valid
if ($showpeers && ($known_host_info{$host} ne " ?")) {
$printhost .= " (" . @{$known_host_peers{$host}} . ")";
}
# Finally print complete host line
printf("%-32s %s\n",
substr($printhost,0,32), $known_host_info{$host});
if ($showpeers && (eval($maxlevel ? $level < $maxlevel : 1))) {
my $peer;
push(@trace, $host);
# Loop through peers
foreach $peer (@{$known_host_peers{$host}}) {
if (&item_in_list($peer, @trace)) {
# we've detected a loop !
$printhost = ' ' x ($level + 1) . "= " . $peer;
# Shorten host string
if ($strip) {
$printhost =~ s/$strip//;
}
printf("%-32s %s\n",
substr($printhost,0,32));
} else {
if (substr($peer,0,3) ne "127") {
&scan_host($peer, $level + 1, @trace);
}
}
}
}
} else { # We did not get answers from this host
my $printhost = ' ' x $level . $host;
# Shorten host string
if ($strip) {
$printhost =~ s/$strip//;
}
printf("%-32s ?\n", substr($printhost,0,32));
}
}
sub scan_hosts()
{
my $host;
for $host (@hosts) {
my @trace;
push(@trace, $host);
scan_host($host, 0, @trace);
}
}
# Main program
if ($single_host) {
push(@hosts, $single_host);
} else {
&read_hosts($hostsfile);
}
# Print header
print <<EOF;
Host st offset(s) version system processor
--------------------------------+--+---------+-----------+------------+---------
EOF
&scan_hosts();
exit 0;