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#!/usr/bin/perl
# ptktime v0.2
# Perl/Tk Time Service (TCP port 37) Client
# Copyright Alan Ford <alan@whirlnet.co.uk> 08/04/1999
# Distributed with no warranty under the GNU Public License
#
# Changelog:
# 08/04/1999 Initial Release Version (0.1)
# 06/06/1999 Added support for command-line specification of timeserver (0.2)
#
# Based on example in The Camel Book
# (There Is No Camel [TM])
require 5.002;
#use strict;
use Tk;
#use Tk::DialogBox;
use Socket;
sub comparetimes ;
sub getlocal ;
sub help ;
my $version = "0.2";
my $MW = MainWindow->new;
$MW->title("Perl/Tk Time Client");
$MW->Label(-text => "Version $version - Written by Alan Ford\n<alan\@whirlnet.co.uk>")->pack(-side => 'bottom');
my $lookup_frame = $MW->Frame()->pack(-expand => '1', -fill => 'both', -side => 'top');
my $button_frame = $MW->Frame()->pack(-expand => '1', -fill => 'both', -side => 'top');
my $local_frame = $MW->Frame()->pack(-expand => '1', -fill => 'both', -side => 'top');
my $remote_frame = $MW->Frame()->pack(-expand => '1', -fill => 'both', -side => 'top');
my $diff_frame = $MW->Frame()->pack(-expand => '1', -fill => 'both', -side => 'top');
$lookup_frame->Label(-text => "Remote Timeserver:")->pack(-side => 'left');
my $host_entry = $lookup_frame->Entry(-width => '25', -relief => 'sunken')->pack(-side => 'left', -expand => '1', -fill => 'x');
$local_frame->Label(-text => "Local Time:")->pack(-side => 'left');
my $local_time = $local_frame->Entry(-width => '25', -relief => 'sunken', -justify => 'right')->pack(-side => 'left', -expand => '1', -fill => 'x');
$remote_frame->Label(-text => "Remote Time:")->pack(-side => 'left');
my $remote_time = $remote_frame->Entry(-width => '25', -relief => 'sunken', -justify => 'right')->pack(-side => 'left', -expand => '1', -fill => 'x');
$diff_frame->Label(-text => "Difference in Seconds:")->pack(-side => 'left');
my $diff_secs = $diff_frame->Entry(-width => '25', -relief => 'sunken', -justify => 'right')->pack(-side => 'left', -expand => '1', -fill => 'x');
my $comparetimes = $button_frame->Button(-text => 'Compare Times',
-command => sub
{
comparetimes;
});
$comparetimes->pack(-side => 'left', -expand => '1', -fill => 'both');
my $getlocal = $button_frame->Button(-text => 'Get Local Time',
-command => sub
{
getlocal;
});
$getlocal->pack(-side => 'left', -expand => '1', -fill => 'both');
my $exit = $button_frame->Button(-text => 'Exit',
-command => sub
{
exit;
});
$exit->pack(-side => 'left', -expand => '1', -fill => 'both');
if ($ARGV[0]) {
# Are they asking for help?
if ($ARGV[0] =~ /help$/) {
help;
}
if ($ARGV[0] eq "-?") {
help;
}
if ($ARGV[0] eq "-h") {
help;
}
# Timeserver (probably) given as command-line option
my $cmdserver = $ARGV[0];
$host_entry->insert('0', $cmdserver);
comparetimes;
}
MainLoop;
sub comparetimes {
my $SECS_of_70_YEARS = 2208988800;
sub ctime { scalar localtime(shift) }
my $iaddr = gethostbyname('localhost');
my $proto = getprotobyname('tcp');
my $port = getservbyname('time', 'tcp');
my $paddr = sockaddr_in(0, $iaddr);
my $host = $host_entry->get;
$| = 1;
printf "%-24s %8s %s\n", "localhost", 0, ctime(time());
$local_time->delete(0, 'end');
$remote_time->delete(0, 'end');
printf "%-24s ", $host;
my $hisiaddr = inet_aton($host) or die "Unknown Host: $host";
my $hispaddr = sockaddr_in($port, $hisiaddr);
socket(SOCKET, PF_INET, SOCK_STREAM, $proto)
or die "Socket Error: $!";
connect(SOCKET, $hispaddr) or die "Bind Error for $host: $!";
my $rtime = ' ';
read(SOCKET, $rtime, 4);
close(SOCKET);
my $histime = unpack("N", $rtime) - $SECS_of_70_YEARS;
printf "%8d %s\n", $histime - time, ctime($histime);
$local_time->insert('end', ctime(time()));
$remote_time->insert('end', ctime($histime));
$diff_secs->delete(0, 'end');
$diff_secs->insert('end', $histime - time);
}
sub getlocal {
$local_time->delete('0', 'end');
$local_time->insert('end', ctime(time()));
}
sub help {
print <<EOF
ptktime - Perk/Tk Time Client for X version $version (requires Perl/Tk)
Compares local time with timeserver.
Remote timeserver can (but is not required) be specified as a parameter.
Report bugs to the author, Alan Ford <alan\@whirlnet.co.uk>
For more information: `man ptktime'
EOF
;
exit;
}
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