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&=LV[( # Net::Time.pm
#
# Copyright (C) 1995-2004 Graham Barr. All rights reserved.
# Copyright (C) 2014, 2020 Steve Hay. All rights reserved.
# This module is free software; you can redistribute it and/or modify it under
# the same terms as Perl itself, i.e. under the terms of either the GNU General
# Public License or the Artistic License, as specified in the F file.
package Net::Time;
use 5.008001;
use strict;
use warnings;
use Carp;
use Exporter;
use IO::Select;
use IO::Socket;
use Net::Config;
our @ISA = qw(Exporter);
our @EXPORT_OK = qw(inet_time inet_daytime);
our $VERSION = "3.13";
our $TIMEOUT = 120;
sub _socket {
my ($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 my $addr (@$hosts) {
$me = IO::Socket::INET->new(
PeerAddr => $addr,
PeerPort => $port,
Proto => $proto
)
and last;
}
return unless $me;
$me->send("\n")
if $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;
my $buf = '';
my $offset = 0 | 0;
return
unless defined $s->recv($buf, length(pack("N", 0)));
# unpack, we | 0 to ensure we have an unsigned
my $time = (unpack("N", $buf))[0] | 0;
# the time protocol return time in seconds since 1900, convert
# it to a the required format
if ($^O eq "MacOS") {
# MacOS return seconds since 1904, 1900 was not a leap year.
$offset = (4 * 31536000) | 0;
}
else {
# otherwise return seconds since 1972, there were 17 leap years between
# 1900 and 1972
$offset = (70 * 31536000 + 17 * 86400) | 0;
}
$time - $offset;
}
sub inet_daytime {
my $s = _socket('daytime', 13, @_) || return;
my $buf = '';
defined($s->recv($buf, 1024))
? $buf
: undef;
}
1;
__END__
=head1 NAME
Net::Time - time and daytime network client interface
=head1 SYNOPSIS
use Net::Time qw(inet_time inet_daytime);
print inet_time(); # use default host from Net::Config
print inet_time('localhost');
print inet_time('localhost', 'tcp');
print inet_daytime(); # use default host from Net::Config
print inet_daytime('localhost');
print inet_daytime('localhost', 'tcp');
=head1 DESCRIPTION
C provides subroutines that obtain the time on a remote machine.
=head2 Functions
=over 4
=item C
Obtain the time on C<$host>, or some default h