/usr/share/perl/5.14.2/Net/Time.pm is in perl-modules 5.14.2-6ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | # Net::Time.pm
#
# Copyright (c) 1995-2004 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 = "2.10";
$TIMEOUT = 120;
sub _socket {
my ($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;
}
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 undef;
my $buf = '';
my $offset = 0 | 0;
return undef
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 undef;
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<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 time value in the same units as returned
by time() 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) 1995-2004 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
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