131 lines
3.1 KiB
Perl
131 lines
3.1 KiB
Perl
# Net::Time.pm
|
|
#
|
|
# Copyright (c) 1995-1997 Graham Barr <gbarr@pobox.com>. All rights reserved.
|
|
# This program is free software; you can redistribute it and/or
|
|
# modify it under the same terms as Perl itself.
|
|
|
|
package Net::Time;
|
|
|
|
use strict;
|
|
use vars qw($VERSION @ISA @EXPORT_OK $TIMEOUT);
|
|
use Carp;
|
|
use IO::Socket;
|
|
require Exporter;
|
|
use Net::Config;
|
|
use IO::Select;
|
|
|
|
@ISA = qw(Exporter);
|
|
@EXPORT_OK = qw(inet_time inet_daytime);
|
|
|
|
$VERSION = do { my @r=(q$Revision: 2.5 $=~/\d+/g); sprintf "%d."."%02d"x$#r,@r};
|
|
|
|
$TIMEOUT = 120;
|
|
|
|
sub _socket
|
|
{
|
|
my($pname,$pnum,$host,$proto,$timeout) = @_;
|
|
|
|
$proto ||= 'udp';
|
|
|
|
my $port = (getservbyname($pname, $proto))[2] || $pnum;
|
|
|
|
my $hosts = defined $host ? [ $host ] : $NetConfig{$pname . '_hosts'};
|
|
|
|
my $me;
|
|
|
|
foreach $host (@$hosts)
|
|
{
|
|
$me = IO::Socket::INET->new(PeerAddr => $host,
|
|
PeerPort => $port,
|
|
Proto => $proto
|
|
) and last;
|
|
}
|
|
|
|
$me->send("\n")
|
|
if(defined $me && $proto eq 'udp');
|
|
|
|
$timeout = $TIMEOUT
|
|
unless defined $timeout;
|
|
|
|
IO::Select->new($me)->can_read($timeout)
|
|
? $me
|
|
: undef;
|
|
}
|
|
|
|
sub inet_time
|
|
{
|
|
my $s = _socket('time',37,@_) || return undef;
|
|
my $buf = '';
|
|
|
|
# the time protocol return time in seconds since 1900, convert
|
|
# it to a unix time (seconds since 1970)
|
|
|
|
$s->recv($buf, length(pack("N",0)))
|
|
? (unpack("N",$buf))[0] - 2208988800
|
|
: undef;
|
|
}
|
|
|
|
sub inet_daytime
|
|
{
|
|
my $s = _socket('daytime',13,@_) || return undef;
|
|
my $buf = '';
|
|
|
|
$s->recv($buf, 1024) ? $buf
|
|
: undef;
|
|
}
|
|
|
|
1;
|
|
|
|
__END__
|
|
|
|
=head1 NAME
|
|
|
|
Net::Time - time and daytime network client interface
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use Net::Time qw(inet_time inet_daytime);
|
|
|
|
print inet_time(); # use default host from Net::Config
|
|
print inet_time('localhost');
|
|
print inet_time('localhost', 'tcp');
|
|
|
|
print inet_daytime(); # use default host from Net::Config
|
|
print inet_daytime('localhost');
|
|
print inet_daytime('localhost', 'tcp');
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
C<Net::Time> provides subroutines that obtain the time on a remote machine.
|
|
|
|
=over 4
|
|
|
|
=item inet_time ( [HOST [, PROTOCOL [, TIMEOUT]]])
|
|
|
|
Obtain the time on C<HOST>, or some default host if C<HOST> is not given
|
|
or not defined, using the protocol as defined in RFC868. The optional
|
|
argument C<PROTOCOL> should define the protocol to use, either C<tcp> or
|
|
C<udp>. The result will be a unix-like time value or I<undef> upon
|
|
failure.
|
|
|
|
=item inet_daytime ( [HOST [, PROTOCOL [, TIMEOUT]]])
|
|
|
|
Obtain the time on C<HOST>, or some default host if C<HOST> is not given
|
|
or not defined, using the protocol as defined in RFC867. The optional
|
|
argument C<PROTOCOL> should define the protocol to use, either C<tcp> or
|
|
C<udp>. The result will be an ASCII string or I<undef> upon failure.
|
|
|
|
=back
|
|
|
|
=head1 AUTHOR
|
|
|
|
Graham Barr <gbarr@pobox.com>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright (c) 1995-1997 Graham Barr. All rights reserved.
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the same terms as Perl itself.
|
|
|
|
=cut
|