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root |
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package Net::servent; |
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use strict; |
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use 5.006_001; |
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our $VERSION = '1.01'; |
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our(@EXPORT, @EXPORT_OK, %EXPORT_TAGS); |
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BEGIN { |
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use Exporter (); |
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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 $s_port, aliases are @s_aliases\n"; |
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=head1 DESCRIPTION |
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This module's default exports override the core getservent(), |
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getservbyname(), and |
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getnetbyport() functions, replacing them with versions that return |
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"Net::servent" objects. They take default second arguments of "tcp". This object has methods that return the similarly |
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named structure field name from the C's servent structure from F<netdb.h>; |
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namely name, aliases, port, and proto. The aliases |
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method returns an array reference, the rest scalars. |
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You may also import all the structure fields directly into your namespace |
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as regular variables using the :FIELDS import tag. (Note that this still |
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overrides your core functions.) Access these fields as variables named |
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with a preceding C<s_>. Thus, C<$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 |
