package Net::netent;
use strict;
use 5.006_001;
our $VERSION = '1.00';
our(@EXPORT, @EXPORT_OK, %EXPORT_TAGS);
BEGIN {
use Exporter ();
@EXPORT = qw(getnetbyname getnetbyaddr getnet);
@EXPORT_OK = qw(
$n_name @n_aliases
$n_addrtype $n_net
);
%EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] );
}
use vars @EXPORT_OK;
# Class::Struct forbids use of @ISA
sub import { goto &Exporter::import }
use Class::Struct qw(struct);
struct 'Net::netent' => [
name => '$',
aliases => '@',
addrtype => '$',
net => '$',
];
sub populate (@) {
return unless @_;
my $nob = new();
$n_name = $nob->[0] = $_[0];
@n_aliases = @{ $nob->[1] } = split ' ', $_[1];
$n_addrtype = $nob->[2] = $_[2];
$n_net = $nob->[3] = $_[3];
return $nob;
}
sub getnetbyname ($) { populate(CORE::getnetbyname(shift)) }
sub getnetbyaddr ($;$) {
my ($net, $addrtype);
$net = shift;
require Socket if @_;
$addrtype = @_ ? shift : Socket::AF_INET();
populate(CORE::getnetbyaddr($net, $addrtype))
}
sub getnet($) {
if ($_[0] =~ /^\d+(?:\.\d+(?:\.\d+(?:\.\d+)?)?)?$/) {
require Socket;
&getnetbyaddr(Socket::inet_aton(shift));
} else {
&getnetbyname;
}
}
1;
__END__
=head1 NAME
Net::netent - by-name interface to Perl's built-in getnet*() functions
=head1 SYNOPSIS
use Net::netent qw(:FIELDS);
getnetbyname("loopback") or die "bad net";
printf "%s is %08X\n", $n_name, $n_net;
use Net::netent;
$n = getnetbyname("loopback") or die "bad net";
{ # there's gotta be a better way, eh?
@bytes = unpack("C4", pack("N", $n->net));
shift @bytes while @bytes && $bytes[0] == 0;
}
printf "%s is %08X [%d.%d.%d.%d]\n", $n->name, $n->net, @bytes;
=head1 DESCRIPTION
This module's default exports override the core getnetbyname() and
getnetbyaddr() functions, replacing them with versions that return
"Net::netent" objects. This object has methods that return the similarly
named structure field name from the C's netent structure from F;
namely name, aliases, addrtype, and net. The aliases
method returns an array reference, the rest scalars.
You may also import all the structure fields directly into your namespace
as regular variables using the :FIELDS import tag. (Note that this still
overrides your core functions.) Access these fields as variables named
with a preceding C. Thus, C<$net_obj-Ename()> corresponds to
$n_name if you import the fields. Array references are available as
regular array variables, so for example C<@{ $net_obj-Ealiases()
}> would be simply @n_aliases.
The getnet() function is a simple front-end that forwards a numeric
argument to getnetbyaddr(), and the rest
to getnetbyname().
To access this functionality without the core overrides,
pass the C