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