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File name : ntpsweep
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#! /usr/bin/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 <ntpsweep@lambermont.dyndns.org>

package ntpsweep;
use 5.006_000;
use strict;
use lib "/usr/share/ntp/lib";
use NTP::Util qw(do_dns ntp_read_vars ntp_peers ntp_sntp_line);

(my $program = $0) =~ s%.*/(.+?)(.pl)?$%$1%;
my ($showpeers, $maxlevel, $strip);
my (%known_host_info, %known_host_peers);

exit run(@ARGV) unless caller;

sub run {
    my $opts;
    if (!processOptions(\@_, $opts) || 
        (((@_ != 1) && !$opts->{host} && !@{$opts->{'host-list'}}))) {
        usage(1);
    };

    # no STDOUT buffering
    $| = 1;
    ($showpeers, $maxlevel, $strip) = 
        ($opts->{peers}, $opts->{maxlevel}, $opts->{strip});

    my $hostsfile = shift;

    # Main program

    my @hosts;

    if ($opts->{host}) {
        push @hosts, $opts->{host};
    }
    else {
        @hosts = read_hosts($hostsfile) if $hostsfile;
        push @hosts, @{$opts->{'host-list'}};
    }

    # Print header
    print <<EOF;
Host                             st offset(s) version     system       processor
--------------------------------+--+---------+-----------+------------+---------
EOF

    %known_host_info = ();
    %known_host_peers = ();
    scan_hosts(@hosts);

    return 0;
}

sub scan_hosts {
    my (@hosts) = @_;

    my $host;
    for $host (@hosts) {
        scan_host($host, 0, $host => 1);
    }
}

sub read_hosts {
    my ($hostsfile) = @_;
    my @hosts;

    open my $hosts, $hostsfile 
        or die "$program: FATAL: unable to read $hostsfile: $!\n";

    while (<$hosts>) {
        next if /^\s*(#|$)/; # comment/empty
        chomp;
        push @hosts, $_;
    }

    close $hosts;
    return @hosts;
}

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 (exists $known_host_info{$host}) {
        $known_host = 1;
    }
    else {
        ($offset, $stratum) = ntp_sntp_line($host);

        # got answers ? If so, go on.
        if ($stratum) {
            my $vars = ntp_read_vars(0, [qw(processor system daemon_version)], $host) || {};
            $daemonversion = $vars->{daemon_version};
            $system        = $vars->{system};
            $processor     = $vars->{processor};

            # 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 ($daemonversion) {
            if ($showpeers) {
                my $peers_ref = ntp_peers($host);
                my @peers_tmp = @$peers_ref;
                for (@peers_tmp) {
                    $_->{remote} =~ s/^(?: |x|\.|-|\+|#|\*|o)([^ ]+)/$1/;
                    push @peers, $_->{remote};
                }
            }
        }

        # 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} = " ?";
        }
        $known_host_peers{$host} = [@peers];
    }

    if ($stratum || $known_host) { # Valid or known host
        my $printhost = ' ' x $level . (do_dns($host) || $host);
        # Shorten host string
        if ($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 ($showpeers && ($maxlevel ? $level < $maxlevel : 1)) {
            $trace{$host} = 1;
            # Loop through peers
            foreach my $peer (@{$known_host_peers{$host}}) {
                if (exists $trace{$peer}) {
                    # we've detected a loop !
                    $printhost = ' ' x ($level + 1) . "= " . $peer;
                    # Shorten host string
                    $printhost =~ s/$strip// if $strip;
                    printf "%-32s\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 $level . (do_dns($host) || $host);
        $printhost =~ s/$strip// if $strip;
        printf "%-32s  ?\n", substr $printhost, 0, 32;
    }
}

# EDIT THIS FILE WITH CAUTION  (ntpsweep-opts)
#
# It has been AutoGen-ed  August 14, 2018 at 08:09:11 AM by AutoGen 5.18.5
# From the definitions    ntpsweep-opts.def
# and the template file   perlopt

use Getopt::Long qw(GetOptionsFromArray);
Getopt::Long::Configure(qw(no_auto_abbrev no_ignore_case_always));

my $usage;

sub usage {
    my ($ret) = @_;
    print STDERR $usage;
    exit $ret;
}

sub paged_usage {
    my ($ret) = @_;
    my $pager = $ENV{PAGER} || '(less || more)';

    open STDOUT, "| $pager" or die "Can't fork a pager: $!";
    print $usage;

    exit $ret;
}

sub processOptions {
    my $args = shift;

    my $opts = {
        'host-list' => [],
        'peers' => '',
        'maxlevel' => '',
        'strip' => '',
        'host' => '',
        'help' => '', 'more-help' => ''
    };
    my $argument = '[hostfile]';
    my $ret = GetOptionsFromArray($args, $opts, (
        'host-list|l=s', 'peers|p', 'maxlevel|m=i',
        'strip|s=s', 'host|h=s',
        'help|?', 'more-help'));

    $usage = <<'USAGE';
ntpsweep - Print various informations about given ntp servers - Ver. 4.2.8p12
USAGE: ntpsweep [ -<flag> [<val>] | --<name>[{=| }<val>] ]... [hostfile]

    -l, --host-list=str          Host to execute actions on
                                   - may appear multiple times
    -p, --peers                  Recursively list all peers a host synchronizes to
    -m, --maxlevel=num           Traverse peers up to this level (4 is a reasonable number)
    -s, --strip=str              Strip this string from hostnames
    -?, --help                   Display usage information and exit
        --more-help              Pass the extended usage text through a pager

Options are specified by doubled hyphens and their name or by a single
hyphen and the flag character.
USAGE

    usage(0)       if $opts->{'help'};
    paged_usage(0) if $opts->{'more-help'};
    $_[0] = $opts;
    return $ret;
}

END { close STDOUT };

1;
__END__