+/* dyngroup.c - Demonstration of overlay code */
+/* $OpenLDAP$ */
+/*
+ * Copyright 2003 The OpenLDAP Foundation, All Rights Reserved.
+ * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
+ */
+/*
+ * Copyright 2003, Howard Chu, All rights reserved. <hyc@symas.com>
+ *
+ * Permission is granted to anyone to use this software for any purpose
+ * on any computer system, and to alter it and redistribute it, subject
+ * to the following restrictions:
+ *
+ * 1. The author is not responsible for the consequences of use of this
+ * software, no matter how awful, even if they arise from flaws in it.
+ *
+ * 2. The origin of this software must not be misrepresented, either by
+ * explicit claim or by omission. Since few users ever read sources,
+ * credits should appear in the documentation.
+ *
+ * 3. Altered versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software. Since few users
+ * ever read sources, credits should appear in the documentation.
+ *
+ * 4. This notice may not be removed or altered.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/string.h>
+#include <ac/socket.h>
+
+#include "slap.h"
+
+/* This overlay extends the Compare operation to detect members of a
+ * dynamic group. It has no effect on any other operations. It must
+ * be configured with a pair of attributes to trigger on, e.g.
+ * attrpair member memberURL
+ * will cause compares on "member" to trigger a compare on "memberURL".
+ */
+
+typedef struct adpair {
+ struct adpair *ap_next;
+ AttributeDescription *ap_mem;
+ AttributeDescription *ap_uri;
+} adpair;
+
+static int
+dyngroup_response( Operation *op, SlapReply *rs )
+{
+ slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
+ adpair *ap = on->on_bi.bi_private;
+
+ /* If we've been configured and the current response is
+ * what we're looking for...
+ */
+ if ( ap && op->o_tag == LDAP_REQ_COMPARE &&
+ rs->sr_err == LDAP_NO_SUCH_ATTRIBUTE ) {
+
+ for (;ap;ap=ap->ap_next) {
+ if ( op->oq_compare.rs_ava->aa_desc == ap->ap_mem ) {
+ /* This compare is for one of the attributes we're
+ * interested in. We'll use slapd's existing dyngroup
+ * evaluator to get the answer we want.
+ */
+ int cache = op->o_do_not_cache;
+
+ op->o_do_not_cache = 1;
+ if ( backend_group( op, NULL, &op->o_req_ndn,
+ &op->oq_compare.rs_ava->aa_value, NULL, ap->ap_uri ) == 0 )
+ rs->sr_err = LDAP_COMPARE_TRUE;
+ op->o_do_not_cache = cache;
+ break;
+ }
+ }
+ }
+ /* Default is to just fall through to the normal processing */
+ return SLAP_CB_CONTINUE;
+}
+
+static int dyngroup_config(
+ BackendDB *be,
+ const char *fname,
+ int lineno,
+ int argc,
+ char **argv
+)
+{
+ slap_overinst *on = (slap_overinst *) be->bd_info;
+ adpair ap = { NULL, NULL, NULL }, *a2;
+
+ if ( strcasecmp( argv[0], "attrpair" ) == 0 ) {
+ const char *text;
+ if ( argc != 3 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "%s: line %d: attribute description missing in \"attrpair <member-attribute> <URL-attribute>\" line.\n",
+ fname, lineno, 0 );
+ return( 1 );
+ }
+ if ( slap_str2ad( argv[1], &ap.ap_mem, &text ) ) {
+ Debug( LDAP_DEBUG_ANY,
+ "%s: line %d: attribute description unknown \"attrpair\" line: %s.\n",
+ fname, lineno, text );
+ return( 1 );
+ }
+ if ( slap_str2ad( argv[2], &ap.ap_uri, &text ) ) {
+ Debug( LDAP_DEBUG_ANY,
+ "%s: line %d: attribute description unknown \"attrpair\" line: %s.\n",
+ fname, lineno, text );
+ return( 1 );
+ }
+ /* The on->on_bi.bi_private pointer can be used for
+ * anything this instance of the overlay needs.
+ */
+
+ a2 = ch_malloc( sizeof(adpair) );
+ a2->ap_next = on->on_bi.bi_private;
+ a2->ap_mem = ap.ap_mem;
+ a2->ap_uri = ap.ap_uri;
+ on->on_bi.bi_private = a2;
+ }
+ return 0;
+}
+
+static int
+dyngroup_close(
+ BackendDB *be
+)
+{
+ slap_overinst *on = (slap_overinst *) be->bd_info;
+ adpair *ap, *a2;
+
+ for ( ap = on->on_bi.bi_private; ap; ap = a2 ) {
+ a2 = ap->ap_next;
+ ch_free( ap );
+ }
+ return 0;
+}
+
+static slap_overinst dyngroup;
+
+/* This overlay is set up for dynamic loading via moduleload. For static
+ * configuration, you'll need to arrange for the slap_overinst to be
+ * initialized and registered by some other function inside slapd.
+ */
+
+int init_module(int argc, char *argv[]) {
+ dyngroup.on_bi.bi_type = "dyngroup";
+ dyngroup.on_bi.bi_db_config = dyngroup_config;
+ dyngroup.on_bi.bi_db_close = dyngroup_close;
+ dyngroup.on_response = dyngroup_response;
+
+ return overlay_register( &dyngroup );
+}
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