#! @PATH_PERL@ -w
# @configure_input@
#
# 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 <[email protected]>

package ntpsweep;
use 5.006_000;
use strict;
use lib "@PERLLIBDIR@";
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;
   }
}

@ntpsweep_opts@

1;
__END__

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