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diff --git a/servers/slapd/back-perl/SampleLDAP.pm b/servers/slapd/back-perl/SampleLDAP.pm
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+# This is a sample Perl module for the OpenLDAP server slapd.
+# $OpenLDAP$
+## This work is part of OpenLDAP Software <http://www.openldap.org/>.
+##
+## Copyright 1998-2021 The OpenLDAP Foundation.
+## Portions Copyright 1999 John C. Quillan.
+## All rights reserved.
+##
+## Redistribution and use in source and binary forms, with or without
+## modification, are permitted only as authorized by the OpenLDAP
+## Public License.
+##
+## A copy of this license is available in the file LICENSE in the
+## top-level directory of the distribution or, alternatively, at
+## <http://www.OpenLDAP.org/license.html>.
+
+# Usage: Add something like this to slapd.conf:
+#
+#	database	perl
+#	suffix		"o=AnyOrg,c=US"
+#	perlModulePath	/directory/containing/this/module
+#	perlModule	SampleLDAP
+#
+# See the slapd-perl(5) manual page for details.
+#
+# This demo module keeps an in-memory hash {"DN" => "LDIF entry", ...}
+# built in sub add{} & co.  The data is lost when slapd shuts down.
+
+package SampleLDAP;
+use strict;
+use warnings;
+use POSIX;
+
+$SampleLDAP::VERSION = '1.01';
+
+sub new {
+    my $class = shift;
+
+    my $this = {};
+    bless $this, $class;
+    print {*STDERR} "Here in new\n";
+    print {*STDERR} 'Posix Var ' . BUFSIZ . ' and ' . FILENAME_MAX . "\n";
+    return $this;
+}
+
+sub init {
+    return 0;
+}
+
+sub search {
+    my $this = shift;
+    my ( $base, $scope, $deref, $sizeLim, $timeLim, $filterStr, $attrOnly,
+        @attrs )
+      = @_;
+    print {*STDERR} "====$filterStr====\n";
+    $filterStr =~ s/\(|\)//gm;
+    $filterStr =~ s/=/: /m;
+
+    my @match_dn = ();
+    for my $dn ( keys %{$this} ) {
+        if ( $this->{$dn} =~ /$filterStr/imx ) {
+            push @match_dn, $dn;
+            last if ( scalar @match_dn == $sizeLim );
+
+        }
+    }
+
+    my @match_entries = ();
+
+    for my $dn (@match_dn) {
+        push @match_entries, $this->{$dn};
+    }
+
+    return ( 0, @match_entries );
+
+}
+
+sub compare {
+    my $this = shift;
+    my ( $dn, $avaStr ) = @_;
+    my $rc = 5;    # LDAP_COMPARE_FALSE
+
+    $avaStr =~ s/=/: /m;
+
+    if ( $this->{$dn} =~ /$avaStr/im ) {
+        $rc = 6;    # LDAP_COMPARE_TRUE
+    }
+
+    return $rc;
+}
+
+sub modify {
+    my $this = shift;
+
+    my ( $dn, @list ) = @_;
+
+    while ( @list > 0 ) {
+        my $action = shift @list;
+        my $key    = shift @list;
+        my $value  = shift @list;
+
+        if ( $action eq 'ADD' ) {
+            $this->{$dn} .= "$key: $value\n";
+
+        }
+        elsif ( $action eq 'DELETE' ) {
+            $this->{$dn} =~ s/^$key:\s*$value\n//im;
+
+        }
+        elsif ( $action eq 'REPLACE' ) {
+            $this->{$dn} =~ s/$key: .*$/$key: $value/im;
+        }
+    }
+
+    return 0;
+}
+
+sub add {
+    my $this = shift;
+
+    my ($entryStr) = @_;
+
+    my ($dn) = ( $entryStr =~ /dn:\s(.*)$/m );
+
+    #
+    # This needs to be here until a normalized dn is
+    # passed to this routine.
+    #
+    $dn = uc $dn;
+    $dn =~ s/\s*//gm;
+
+    $this->{$dn} = $entryStr;
+
+    return 0;
+}
+
+sub modrdn {
+    my $this = shift;
+
+    my ( $dn, $newdn, $delFlag ) = @_;
+
+    $this->{$newdn} = $this->{$dn};
+
+    if ($delFlag) {
+        delete $this->{$dn};
+    }
+    return 0;
+
+}
+
+sub delete {
+    my $this = shift;
+
+    my ($dn) = @_;
+
+    print {*STDERR} "XXXXXX $dn XXXXXXX\n";
+    delete $this->{$dn};
+    return 0;
+}
+
+sub config {
+    my $this = shift;
+
+    my (@args) = @_;
+    local $, = ' - ';
+    print {*STDERR} @args;
+    print {*STDERR} "\n";
+    return 0;
+}
+
+1;