95 lines
2.9 KiB
Perl
95 lines
2.9 KiB
Perl
package Net::protoent;
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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(getprotobyname getprotobynumber getprotoent);
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@EXPORT_OK = qw( $p_name @p_aliases $p_proto );
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%EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] );
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}
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use vars @EXPORT_OK;
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# Class::Struct forbids use of @ISA
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sub import { goto &Exporter::import }
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use Class::Struct qw(struct);
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struct 'Net::protoent' => [
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name => '$',
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aliases => '@',
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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 $pob = new();
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$p_name = $pob->[0] = $_[0];
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@p_aliases = @{ $pob->[1] } = split ' ', $_[1];
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$p_proto = $pob->[2] = $_[2];
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return $pob;
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}
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sub getprotoent ( ) { populate(CORE::getprotoent()) }
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sub getprotobyname ($) { populate(CORE::getprotobyname(shift)) }
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sub getprotobynumber ($) { populate(CORE::getprotobynumber(shift)) }
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sub getproto ($;$) {
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no strict 'refs';
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return &{'getprotoby' . ($_[0]=~/^\d+$/ ? 'number' : 'name')}(@_);
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}
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1;
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__END__
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=head1 NAME
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Net::protoent - by-name interface to Perl's built-in getproto*() functions
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=head1 SYNOPSIS
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use Net::protoent;
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$p = getprotobyname(shift || 'tcp') || die "no proto";
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printf "proto for %s is %d, aliases are %s\n",
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$p->name, $p->proto, "@{$p->aliases}";
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use Net::protoent qw(:FIELDS);
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getprotobyname(shift || 'tcp') || die "no proto";
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print "proto for $p_name is $p_proto, aliases are @p_aliases\n";
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=head1 DESCRIPTION
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This module's default exports override the core getprotoent(),
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getprotobyname(), and getnetbyport() functions, replacing them with
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versions that return "Net::protoent" objects. They take default
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second arguments of "tcp". This object has methods that return the
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similarly named structure field name from the C's protoent structure
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from F<netdb.h>; namely name, aliases, and proto. The aliases method
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returns an array reference, the rest scalars.
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You may also import all the structure fields directly into your namespace
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as regular variables using the :FIELDS import tag. (Note that this still
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overrides your core functions.) Access these fields as variables named
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with a preceding C<p_>. Thus, C<$proto_obj-E<gt>name()> corresponds to
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$p_name if you import the fields. Array references are available as
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regular array variables, so for example C<@{ $proto_obj-E<gt>aliases()
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}> would be simply @p_aliases.
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The getproto() function is a simple front-end that forwards a numeric
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argument to getprotobyport(), and the rest to getprotobyname().
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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 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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