mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
111 lines
3.4 KiB
111 lines
3.4 KiB
package Net::servent;
|
|
use strict;
|
|
|
|
BEGIN {
|
|
use Exporter ();
|
|
use vars qw(@EXPORT @EXPORT_OK %EXPORT_TAGS);
|
|
@EXPORT = qw(getservbyname getservbyport getservent getserv);
|
|
@EXPORT_OK = qw( $s_name @s_aliases $s_port $s_proto );
|
|
%EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] );
|
|
}
|
|
use vars @EXPORT_OK;
|
|
|
|
# Class::Struct forbids use of @ISA
|
|
sub import { goto &Exporter::import }
|
|
|
|
use Class::Struct qw(struct);
|
|
struct 'Net::servent' => [
|
|
name => '$',
|
|
aliases => '@',
|
|
port => '$',
|
|
proto => '$',
|
|
];
|
|
|
|
sub populate (@) {
|
|
return unless @_;
|
|
my $sob = new();
|
|
$s_name = $sob->[0] = $_[0];
|
|
@s_aliases = @{ $sob->[1] } = split ' ', $_[1];
|
|
$s_port = $sob->[2] = $_[2];
|
|
$s_proto = $sob->[3] = $_[3];
|
|
return $sob;
|
|
}
|
|
|
|
sub getservent ( ) { populate(CORE::getservent()) }
|
|
sub getservbyname ($;$) { populate(CORE::getservbyname(shift,shift||'tcp')) }
|
|
sub getservbyport ($;$) { populate(CORE::getservbyport(shift,shift||'tcp')) }
|
|
|
|
sub getserv ($;$) {
|
|
no strict 'refs';
|
|
return &{'getservby' . ($_[0]=~/^\d+$/ ? 'port' : 'name')}(@_);
|
|
}
|
|
|
|
1;
|
|
|
|
__END__
|
|
|
|
=head1 NAME
|
|
|
|
Net::servent - by-name interface to Perl's built-in getserv*() functions
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use Net::servent;
|
|
$s = getservbyname(shift || 'ftp') || die "no service";
|
|
printf "port for %s is %s, aliases are %s\n",
|
|
$s->name, $s->port, "@{$s->aliases}";
|
|
|
|
use Net::servent qw(:FIELDS);
|
|
getservbyname(shift || 'ftp') || die "no service";
|
|
print "port for $s_name is $s_port, aliases are @s_aliases\n";
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This module's default exports override the core getservent(),
|
|
getservbyname(), and
|
|
getnetbyport() functions, replacing them with versions that return
|
|
"Net::servent" objects. They take default second arguments of "tcp". This object has methods that return the similarly
|
|
named structure field name from the C's servent structure from F<netdb.h>;
|
|
namely name, aliases, port, and proto. The aliases
|
|
method returns an array reference, the rest scalars.
|
|
|
|
You may also import all the structure fields directly into your namespace
|
|
as regular variables using the :FIELDS import tag. (Note that this still
|
|
overrides your core functions.) Access these fields as variables named
|
|
with a preceding C<n_>. Thus, C<$serv_obj-E<gt>name()> corresponds to
|
|
$s_name if you import the fields. Array references are available as
|
|
regular array variables, so for example C<@{ $serv_obj-E<gt>aliases()
|
|
}> would be simply @s_aliases.
|
|
|
|
The getserv() function is a simple front-end that forwards a numeric
|
|
argument to getservbyport(), and the rest to getservbyname().
|
|
|
|
To access this functionality without the core overrides,
|
|
pass the C<use> an empty import list, and then access
|
|
function functions with their full qualified names.
|
|
On the other hand, the built-ins are still available
|
|
via the C<CORE::> pseudo-package.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
use Net::servent qw(:FIELDS);
|
|
|
|
while (@ARGV) {
|
|
my ($service, $proto) = ((split m!/!, shift), 'tcp');
|
|
my $valet = getserv($service, $proto);
|
|
unless ($valet) {
|
|
warn "$0: No service: $service/$proto\n"
|
|
next;
|
|
}
|
|
printf "service $service/$proto is port %d\n", $valet->port;
|
|
print "alias are @s_aliases\n" if @s_aliases;
|
|
}
|
|
|
|
=head1 NOTE
|
|
|
|
While this class is currently implemented using the Class::Struct
|
|
module to build a struct-like class, you shouldn't rely upon this.
|
|
|
|
=head1 AUTHOR
|
|
|
|
Tom Christiansen
|