usbmodeswitch: Updated to v.1.2.6 from shibby's branch.

[tomato.git] / release / src / router / dnsmasq / contrib / dnslist / dnslist.pl

#!/usr/bin/perl

# dnslist - Read state file from dnsmasq and create a nice web page to display
#           a list of DHCP clients.
# 
# Copyright (C) 2004  Thomas Tuttle
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTIBILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program*; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
# 
# * The license is in fact included at the end of this file, and can
#   either be viewed by reading everything after "__DATA__" or by
#   running dnslist with the '-l' option.
# 
# Version: 0.2
# Author:  Thomas Tuttle
# Email:   dnslist.20.thinkinginbinary@spamgourmet.org
# License: GNU General Public License, version 2.0
#
# v. 0.0: Too ugly to publish, thrown out.
#
# v. 0.1: First rewrite.
#         Added master host list so offline hosts can still be displayed.
#         Fixed modification detection (a newer modification time is lower.)
#
# v. 0.2: Fixed Client ID = "*" => "None"
#         Fixed HTML entities (a client ID of ????<? screwed it up)
#         Fixed command-line argument processing (apparently, "shift @ARGV" !=
#             "$_ = shift @ARGV"...)
#         Added license information.

use Template;

# Location of state file.  (This is the dnsmasq default.)
# Change with -s <file>
my $dnsmasq_state_file = '/var/lib/misc/dnsmasq.leases';
# Location of template.  (Assumed to be in current directory.)
# Change with -t <file>
my $html_template_file = 'dnslist.tt2';
# File to write HTML page to.  (This is where Slackware puts WWW pages.  It may
# be different on other systems.  Make sure the permissions are set correctly
# for it.)
my $html_output_file = '/var/www/htdocs/dhcp.html';
# Time to wait after each page update.  (The state file is checked for changes
# before each update but is not read in each time, in case it is very big.  The
# page is rewritten just so the "(updated __/__ __:__:__)" text changes ;-)
my $wait_time = 2;

# Read command-line arguments.
while ($_ = shift @ARGV) {
        if (/-s/) { $dnsmasq_state_file = shift; next; }
        if (/-t/) { $html_template_file = shift; next; }
        if (/-o/) { $html_output_file = shift;   next; }
        if (/-d/) { $wait_time = shift;          next; }
        if (/-l/) { show_license();              exit; }
        die "usage: dnslist [-s state_file] [-t template_file] [-o output_file] [-d delay_time]\n";
}

# Master list of clients, offline and online.
my $list = {};
# Sorted host list.  (It's actually sorted by IP--the sub &byip() compares two
# IP addresses, octet by octet, and figures out which is higher.)
my @hosts = ();
# Last time the state file was changed.
my $last_state_change;

# Check for a change to the state file.
sub check_state {
        if (defined $last_state_change) {
                if (-M $dnsmasq_state_file < $last_state_change) {
                        print "check_state: state file has been changed.\n";
                        $last_state_change = -M $dnsmasq_state_file;
                        return 1;
                } else {
                        return 0;
                }
        } else {
                # Last change undefined, so we are running for the first time.
                print "check_state: reading state file at startup.\n";
                read_state();
                $last_state_change = -M $dnsmasq_state_file;
                return 1;
        }
}

# Read data in state file.
sub read_state {
        my $old;
        my $new;
        # Open file.
        unless (open STATE, $dnsmasq_state_file) {
                warn "read_state: can't open $dnsmasq_state_file!\n";
                return 0;
        }
        # Mark all hosts as offline, saving old state.
        foreach $ether (keys %{$list}) {
                $list->{$ether}->{'old_online'} = $list->{$ether}->{'online'};
                $list->{$ether}->{'online'} = 0;
        }
        # Read hosts.
        while (<STATE>) {
                chomp;
                @host{qw/raw_lease ether_addr ip_addr hostname raw_client_id/} = split /\s+/;
                $ether = $host{ether_addr};
                # Mark each online host as online.
                $list->{$ether}->{'online'} = 1;
                # Copy data to master list.
                foreach $key (keys %host) {
                        $list->{$ether}->{$key} = $host{$key};
                }
        }
        close STATE;
        # Handle changes in offline/online state.  (The sub &do_host() handles
        # all of the extra stuff to do with a host's data once it is read.
        foreach $ether (keys %{$list}) {
                $old = $list->{$ether}->{'old_online'};
                $new = $list->{$ether}->{'online'};
                if (not $old) {
                        if (not $new) {
                                do_host($ether, 'offline');
                        } else {
                                do_host($ether, 'join');
                        }
                } else {
                        if (not $new) {
                                do_host($ether, 'leave');
                        } else {
                                do_host($ether, 'online');
                        }
                }
        }
        # Sort hosts by IP ;-)
        @hosts = sort byip values %{$list};
        # Copy sorted list to template data store.
        $data->{'hosts'} = [ @hosts ];
}

# Do stuff per host.
sub do_host {
        my ($ether, $status) = @_;
        
        # Find textual representation of DHCP client ID.
        if ($list->{$ether}->{'raw_client_id'} eq '*') {
                $list->{$ether}->{'text_client_id'} = 'None';
        } else {
                my $text = "";
                foreach $char (split /:/, $list->{$ether}->{'raw_client_id'}) {
                        $char = pack('H2', $char);
                        if (ord($char) >= 32 and ord($char) <= 127) {
                                $text .= $char;
                        } else {
                                $text .= "?";
                        }
                }
                $list->{$ether}->{'text_client_id'} = $text;
        }
                
        # Convert lease expiration date/time to text.
        if ($list->{$ether}->{'raw_lease'} == 0) {
                $list->{$ether}->{'text_lease'} = 'Never';
        } else {
                $list->{$ether}->{'text_lease'} = nice_time($list->{$ether}->{'raw_lease'});
        }
        
        if ($status eq 'offline') {
                # Nothing to do.
        } elsif ($status eq 'online') {
                # Nothing to do.
        } elsif ($status eq 'join') {
                # Update times for joining host.
                print "do_host: $ether joined the network.\n";
                $list->{$ether}->{'join_time'} = time;
                $list->{$ether}->{'since'} = nice_time(time);
        } elsif ($status eq 'leave') {
                # Update times for leaving host.
                print "do_host: $ether left the network.\n";
                $list->{$ether}->{'leave_time'} = time;
                $list->{$ether}->{'since'} = nice_time(time);
        }
        
}

# Convert time to a string representation.
sub nice_time {
        my $time = shift;
        my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $dst) = localtime($time);
        $sec = pad($sec, '0', 2);
        $min = pad($min, '0', 2);
        $hour = pad($hour, '0', 2);
        $mon = pad($mon, '0', 2);
        $mday = pad($mday, '0', 2);
        return "$mon/$mday $hour:$min:$sec";
}

# Pad string to a certain length by repeatedly prepending another string.
sub pad {
        my ($text, $pad, $length) = @_;
        while (length($text) < $length) {
                $text = "$pad$text";
        }
        return $text;
}

# Compare two IP addresses.  (Uses $a and $b from sort.)
sub byip {
        # Split into octets.
        my @a = split /\./, $a->{ip_addr};
        my @b = split /\./, $b->{ip_addr};
        # Compare octets.
        foreach $n (0..3) {
                return $a[$n] <=> $b[$n] if ($a[$n] != $b[$n]);
        }
        # If we get here there is no difference.
        return 0;
}
                
# Output HTML file.
sub write_output {
        # Create new template object.
        my $template = Template->new(
                {
                        ABSOLUTE => 1, # /var/www/... is an absolute path
                        OUTPUT => $html_output_file # put it here, not STDOUT
                }
        );
        $data->{'updated'} = nice_time(time); # add "(updated ...)" to file
        unless ($template->process($html_template_file, $data)) { # do it
                warn "write_output: Template Toolkit error: " . $template->error() . "\n";
                return 0;
        }
        print "write_output: page updated.\n";
        return 1;
}

sub show_license {
        while (<DATA>) {
                print;
                $line++;
                if ($line == 24) { <>; $line = 1; }
        }
}

# Main loop.
while (1) {
        # Check for state change.
        if (check_state()) {
                read_state();
                sleep 1; # Sleep for a second just so we don't wear anything
                         # out.  (By not sleeping the whole time after a change
                         # we can detect rapid changes more easily--like if 300
                         # hosts all come back online, they show up quicker.)
        } else {
                sleep $wait_time; # Take a nap.
        }
        write_output(); # Write the file anyway.
}
__DATA__
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                            Preamble

  The licenses for most software are designed to take away your
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Foundation's software and to any other program whose authors commit to
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   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains
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except as expressly provided under this License.  Any attempt
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This section is intended to make thoroughly clear what is believed to
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may add an explicit geographical distribution limitation excluding
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                            NO WARRANTY

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                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

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    This program is distributed in the hope that it will be useful,
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


Also add information on how to contact you by electronic and paper mail.

If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:

    Gnomovision version 69, Copyright (C) year name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.

You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary.  Here is a sample; alter the names:

  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  `Gnomovision' (which makes passes at compilers) written by James Hacker.

  <signature of Ty Coon>, 1 April 1989
  Ty Coon, President of Vice

This General Public License does not permit incorporating your program into
proprietary programs.  If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library.  If this is what you want to do, use the GNU Library General
Public License instead of this License.