94 lines
2.8 KiB
Perl
94 lines
2.8 KiB
Perl
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package User::grent;
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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(getgrent getgrgid getgrnam getgr);
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@EXPORT_OK = qw($gr_name $gr_gid $gr_passwd $gr_mem @gr_members);
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%EXPORT_TAGS = ( FIELDS => [ @EXPORT_OK, @EXPORT ] );
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}
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use vars @EXPORT_OK;
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# Class::Struct forbids use of @ISA
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sub import { goto &Exporter::import }
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use Class::Struct qw(struct);
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struct 'User::grent' => [
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name => '$',
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passwd => '$',
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gid => '$',
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members => '@',
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];
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sub populate (@) {
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return unless @_;
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my $gob = new();
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($gr_name, $gr_passwd, $gr_gid) = @$gob[0,1,2] = @_[0,1,2];
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@gr_members = @{$gob->[3]} = split ' ', $_[3];
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return $gob;
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}
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sub getgrent ( ) { populate(CORE::getgrent()) }
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sub getgrnam ($) { populate(CORE::getgrnam(shift)) }
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sub getgrgid ($) { populate(CORE::getgrgid(shift)) }
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sub getgr ($) { ($_[0] =~ /^\d+/) ? &getgrgid : &getgrnam }
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1;
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__END__
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=head1 NAME
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User::grent - by-name interface to Perl's built-in getgr*() functions
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=head1 SYNOPSIS
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use User::grent;
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$gr = getgrgid(0) or die "No group zero";
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if ( $gr->name eq 'wheel' && @{$gr->members} > 1 ) {
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print "gid zero name wheel, with other members";
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}
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use User::grent qw(:FIELDS;
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getgrgid(0) or die "No group zero";
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if ( $gr_name eq 'wheel' && @gr_members > 1 ) {
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print "gid zero name wheel, with other members";
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}
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$gr = getgr($whoever);
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=head1 DESCRIPTION
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This module's default exports override the core getgrent(), getgruid(),
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and getgrnam() functions, replacing them with versions that return
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"User::grent" objects. This object has methods that return the similarly
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named structure field name from the C's passwd structure from F<grp.h>;
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namely name, passwd, gid, and members (not mem). The first three
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return scalars, the last an array reference.
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You may also import all the structure fields directly into your namespace
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as regular variables using the :FIELDS import tag. (Note that this still
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overrides your core functions.) Access these fields as variables named
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with a preceding C<gr_>. Thus, C<$group_obj-E<gt>gid()> corresponds
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to $gr_gid if you import the fields. Array references are available as
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regular array variables, so C<@{ $group_obj-E<gt>members() }> would be
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simply @gr_members.
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The getpw() function is a simple front-end that forwards
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a numeric argument to getpwuid() and the rest to getpwnam().
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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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