]> git.sur5r.net Git - openldap/blobdiff - servers/slapd/backend.c
+ Fixed slapd connectionless LDAP support
[openldap] / servers / slapd / backend.c
index d5cb3d77d57ddef935fea84dd20a5feea5a657d6..6d05b3212e55ab96a37faf905b16f2e408296a02 100644 (file)
@@ -2,7 +2,7 @@
 /* $OpenLDAP$ */
 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
  *
- * Copyright 1998-2004 The OpenLDAP Foundation.
+ * Copyright 1998-2006 The OpenLDAP Foundation.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
 #include "lutil.h"
 #include "lber_pvt.h"
 
-#include "ldap_rq.h"
-
-#ifdef LDAP_SLAPI
-#include "slapi/slapi.h"
-
-static void init_group_pblock( Operation *op, Entry *target,
-       Entry *e, struct berval *op_ndn, AttributeDescription *group_at );
-static int call_group_preop_plugins( Operation *op );
-static void call_group_postop_plugins( Operation *op );
-#endif /* LDAP_SLAPI */
-
 /*
  * If a module is configured as dynamic, its header should not
  * get included into slapd. While this is a general rule and does
@@ -56,163 +45,76 @@ static void call_group_postop_plugins( Operation *op );
  * imported into slapd without appropriate __declspec(dllimport) directives.
  */
 
-#if SLAPD_BDB == SLAPD_MOD_STATIC
-#include "back-bdb/external.h"
-#endif
-#if SLAPD_DNSSRV == SLAPD_MOD_STATIC
-#include "back-dnssrv/external.h"
-#endif
-#if SLAPD_HDB == SLAPD_MOD_STATIC
-#include "back-hdb/external.h"
-#endif
-#if SLAPD_LDAP == SLAPD_MOD_STATIC
-#include "back-ldap/external.h"
-#endif
-#if SLAPD_LDBM == SLAPD_MOD_STATIC
-#include "back-ldbm/external.h"
-#endif
-#if SLAPD_META == SLAPD_MOD_STATIC
-#include "back-meta/external.h"
-#endif
-#if SLAPD_MONITOR == SLAPD_MOD_STATIC
-#include "back-monitor/external.h"
-#endif
-#if SLAPD_NULL == SLAPD_MOD_STATIC
-#include "back-null/external.h"
-#endif
-#if SLAPD_PASSWD == SLAPD_MOD_STATIC
-#include "back-passwd/external.h"
-#endif
-#if SLAPD_PERL == SLAPD_MOD_STATIC
-#include "back-perl/external.h"
-#endif
-#if SLAPD_RELAY == SLAPD_MOD_STATIC
-#include "back-relay/external.h"
-#endif
-#if SLAPD_SHELL == SLAPD_MOD_STATIC
-#include "back-shell/external.h"
-#endif
-#if SLAPD_TCL == SLAPD_MOD_STATIC
-#include "back-tcl/external.h"
-#endif
-#if SLAPD_SQL == SLAPD_MOD_STATIC
-#include "back-sql/external.h"
-#endif
-#if SLAPD_PRIVATE == SLAPD_MOD_STATIC
-#include "private/external.h"
-#endif
-
-static BackendInfo binfo[] = {
-#if SLAPD_BDB == SLAPD_MOD_STATIC
-       {"bdb", bdb_initialize},
-#endif
-#if SLAPD_DNSSRV == SLAPD_MOD_STATIC
-       {"dnssrv",      dnssrv_back_initialize},
-#endif
-#if SLAPD_HDB == SLAPD_MOD_STATIC
-       {"hdb", hdb_initialize},
-#endif
-#if SLAPD_LDAP == SLAPD_MOD_STATIC
-       {"ldap",        ldap_back_initialize},
-#endif
-#if SLAPD_LDBM == SLAPD_MOD_STATIC
-       {"ldbm",        ldbm_back_initialize},
-#endif
-#if SLAPD_META == SLAPD_MOD_STATIC
-       {"meta",        meta_back_initialize},
-#endif
-#if SLAPD_MONITOR == SLAPD_MOD_STATIC
-       {"monitor",     monitor_back_initialize},
-#endif
-#if SLAPD_NULL == SLAPD_MOD_STATIC
-       {"null",        null_back_initialize},
-#endif
-#if SLAPD_PASSWD == SLAPD_MOD_STATIC
-       {"passwd",      passwd_back_initialize},
-#endif
-#if SLAPD_PERL == SLAPD_MOD_STATIC
-       {"perl",        perl_back_initialize},
-#endif
-#if SLAPD_RELAY == SLAPD_MOD_STATIC
-       {"relay",       relay_back_initialize},
-#endif
-#if SLAPD_SHELL == SLAPD_MOD_STATIC
-       {"shell",       shell_back_initialize},
-#endif
-#if SLAPD_TCL == SLAPD_MOD_STATIC
-       {"tcl",         tcl_back_initialize},
-#endif
-#if SLAPD_SQL == SLAPD_MOD_STATIC
-       {"sql",         sql_back_initialize},
-#endif
-       /* for any private backend */
-#if SLAPD_PRIVATE == SLAPD_MOD_STATIC
-       {"private",     private_back_initialize},
-#endif
-       {NULL}
-};
-
 int                    nBackendInfo = 0;
-BackendInfo    *backendInfo = NULL;
+slap_bi_head backendInfo = LDAP_STAILQ_HEAD_INITIALIZER(backendInfo);
 
 int                    nBackendDB = 0; 
-BackendDB      *backendDB = NULL;
+slap_be_head backendDB = LDAP_STAILQ_HEAD_INITIALIZER(backendDB);
+
+static int
+backend_init_controls( BackendInfo *bi )
+{
+       if ( bi->bi_controls ) {
+               int     i;
 
-ldap_pvt_thread_pool_t syncrepl_pool;
-int                    syncrepl_pool_max = SLAP_MAX_SYNCREPL_THREADS;
+               for ( i = 0; bi->bi_controls[ i ]; i++ ) {
+                       int     cid;
+
+                       if ( slap_find_control_id( bi->bi_controls[ i ], &cid )
+                                       == LDAP_CONTROL_NOT_FOUND )
+                       {
+                               if ( !( slapMode & SLAP_TOOL_MODE ) ) {
+                                       assert( 0 );
+                               }
+
+                               return -1;
+                       }
+
+                       bi->bi_ctrls[ cid ] = 1;
+               }
+       }
+
+       return 0;
+}
 
 int backend_init(void)
 {
        int rc = -1;
+       BackendInfo *bi;
 
-       ldap_pvt_thread_pool_init( &syncrepl_pool, syncrepl_pool_max, 0 );
-
-       if((nBackendInfo != 0) || (backendInfo != NULL)) {
+       if((nBackendInfo != 0) || !LDAP_STAILQ_EMPTY(&backendInfo)) {
                /* already initialized */
-#ifdef NEW_LOGGING
-               LDAP_LOG( BACKEND, ERR, 
-                       "backend_init:  backend already initialized\n", 0, 0, 0 );
-#else
                Debug( LDAP_DEBUG_ANY,
-                       "backend_init: already initialized.\n", 0, 0, 0 );
-#endif
+                       "backend_init: already initialized\n", 0, 0, 0 );
                return -1;
        }
 
-       for( ;
-               binfo[nBackendInfo].bi_type != NULL;
-               nBackendInfo++ )
-       {
-               assert( binfo[nBackendInfo].bi_init );
+       for( bi=slap_binfo; bi->bi_type != NULL; bi++,nBackendInfo++ ) {
+               assert( bi->bi_init != 0 );
 
-               rc = binfo[nBackendInfo].bi_init( &binfo[nBackendInfo] );
+               rc = bi->bi_init( bi );
 
                if(rc != 0) {
-#ifdef NEW_LOGGING
-                       LDAP_LOG( BACKEND, INFO, 
-                               "backend_init:  initialized for type \"%s\"\n",
-                               binfo[nBackendInfo].bi_type, 0, 0 );
-#else
                        Debug( LDAP_DEBUG_ANY,
                                "backend_init: initialized for type \"%s\"\n",
-                               binfo[nBackendInfo].bi_type, 0, 0 );
-#endif
+                               bi->bi_type, 0, 0 );
                        /* destroy those we've already inited */
                        for( nBackendInfo--;
                                nBackendInfo >= 0 ;
                                nBackendInfo-- )
                        { 
-                               if ( binfo[nBackendInfo].bi_destroy ) {
-                                       binfo[nBackendInfo].bi_destroy(
-                                               &binfo[nBackendInfo] );
+                               if ( slap_binfo[nBackendInfo].bi_destroy ) {
+                                       slap_binfo[nBackendInfo].bi_destroy(
+                                               &slap_binfo[nBackendInfo] );
                                }
                        }
                        return rc;
                }
+
+               LDAP_STAILQ_INSERT_TAIL(&backendInfo, bi, bi_next);
        }
 
        if ( nBackendInfo > 0) {
-               backendInfo = binfo;
                return 0;
        }
 
@@ -220,13 +122,9 @@ int backend_init(void)
        return 0;
 #else
 
-#ifdef NEW_LOGGING
-       LDAP_LOG( BACKEND, ERR, "backend_init: failed\n", 0, 0, 0 );
-#else
        Debug( LDAP_DEBUG_ANY,
                "backend_init: failed\n",
                0, 0, 0 );
-#endif
 
        return rc;
 #endif /* SLAPD_MODULES */
@@ -237,90 +135,91 @@ int backend_add(BackendInfo *aBackendInfo)
        int rc = 0;
 
        if ( aBackendInfo->bi_init == NULL ) {
-#ifdef NEW_LOGGING
-               LDAP_LOG( BACKEND, ERR, "backend_add: "
-                       "backend type \"%s\" does not have the (mandatory)init function\n",
-                       aBackendInfo->bi_type, 0, 0 );
-#else
                Debug( LDAP_DEBUG_ANY, "backend_add: "
                        "backend type \"%s\" does not have the (mandatory)init function\n",
                        aBackendInfo->bi_type, 0, 0 );
-#endif
                return -1;
        }
 
-   if ((rc = aBackendInfo->bi_init(aBackendInfo)) != 0) {
-#ifdef NEW_LOGGING
-               LDAP_LOG( BACKEND, ERR, 
-                       "backend_add:  initialization for type \"%s\" failed\n",
-                       aBackendInfo->bi_type, 0, 0 );
-#else
+       rc = aBackendInfo->bi_init(aBackendInfo);
+       if ( rc != 0) {
                Debug( LDAP_DEBUG_ANY,
                        "backend_add:  initialization for type \"%s\" failed\n",
                        aBackendInfo->bi_type, 0, 0 );
-#endif
                return rc;
-   }
+       }
+
+       (void)backend_init_controls( aBackendInfo );
 
        /* now add the backend type to the Backend Info List */
-       {
-               BackendInfo *newBackendInfo = 0;
+       LDAP_STAILQ_INSERT_TAIL( &backendInfo, aBackendInfo, bi_next );
+       nBackendInfo++;
+       return 0;
+}
+
+static int
+backend_set_controls( BackendDB *be )
+{
+       BackendInfo     *bi = be->bd_info;
 
-               /* if backendInfo == binfo no deallocation of old backendInfo */
-               if (backendInfo == binfo) {
-                       newBackendInfo = ch_calloc(nBackendInfo + 1, sizeof(BackendInfo));
-                       AC_MEMCPY(newBackendInfo, backendInfo,
-                               sizeof(BackendInfo) * nBackendInfo);
+       /* back-relay takes care of itself; so may do other */
+       if ( overlay_is_over( be ) ) {
+               bi = ((slap_overinfo *)be->bd_info->bi_private)->oi_orig;
+       }
+
+       if ( bi->bi_controls ) {
+               if ( be->be_ctrls[ SLAP_MAX_CIDS ] == 0 ) {
+                       AC_MEMCPY( be->be_ctrls, bi->bi_ctrls,
+                                       sizeof( be->be_ctrls ) );
+                       be->be_ctrls[ SLAP_MAX_CIDS ] = 1;
+                       
                } else {
-                       newBackendInfo = ch_realloc(backendInfo,
-                               sizeof(BackendInfo) * (nBackendInfo + 1));
+                       int     i;
+                       
+                       for ( i = 0; i < SLAP_MAX_CIDS; i++ ) {
+                               if ( bi->bi_ctrls[ i ] ) {
+                                       be->be_ctrls[ i ] = bi->bi_ctrls[ i ];
+                               }
+                       }
                }
 
-               AC_MEMCPY(&newBackendInfo[nBackendInfo], aBackendInfo,
-                       sizeof(BackendInfo));
-               backendInfo = newBackendInfo;
-               nBackendInfo++;
-               return 0;
        }
+
+       return 0;
 }
 
 /* startup a specific backend database */
 int backend_startup_one(Backend *be)
 {
-       int rc = 0;
+       int             rc = 0;
 
-       assert(be);
+       assert( be != NULL );
 
        be->be_pending_csn_list = (struct be_pcl *)
-               ch_calloc( 1, sizeof( struct be_pcl ));
-       build_new_dn( &be->be_context_csn, be->be_nsuffix,
-               (struct berval *)&slap_ldapsync_cn_bv, NULL );
+               ch_calloc( 1, sizeof( struct be_pcl ) );
 
        LDAP_TAILQ_INIT( be->be_pending_csn_list );
 
-#ifdef NEW_LOGGING
-       LDAP_LOG( BACKEND, DETAIL1, "backend_startup:  starting \"%s\"\n",
-               be->be_suffix ? be->be_suffix[0].bv_val : "(unknown)",
-               0, 0 );
-#else
        Debug( LDAP_DEBUG_TRACE,
-               "backend_startup: starting \"%s\"\n",
+               "backend_startup_one: starting \"%s\"\n",
                be->be_suffix ? be->be_suffix[0].bv_val : "(unknown)",
                0, 0 );
-#endif
+
+       /* set database controls */
+       (void)backend_set_controls( be );
+
        if ( be->bd_info->bi_db_open ) {
                rc = be->bd_info->bi_db_open( be );
-               if ( rc != 0 ) {
-#ifdef NEW_LOGGING
-                       LDAP_LOG( BACKEND, CRIT, 
-                               "backend_startup: bi_db_open failed! (%d)\n", rc, 0, 0 );
-#else
+               if ( rc == 0 ) {
+                       (void)backend_set_controls( be );
+
+               } else {
                        Debug( LDAP_DEBUG_ANY,
-                               "backend_startup: bi_db_open failed! (%d)\n",
+                               "backend_startup_one: bi_db_open failed! (%d)\n",
                                rc, 0, 0 );
-#endif
                }
        }
+
        return rc;
 }
 
@@ -328,17 +227,13 @@ int backend_startup(Backend *be)
 {
        int i;
        int rc = 0;
+       BackendInfo *bi;
 
        if( ! ( nBackendDB > 0 ) ) {
                /* no databases */
-#ifdef NEW_LOGGING
-               LDAP_LOG( BACKEND, INFO, 
-                       "backend_startup: %d databases to startup. \n", nBackendDB, 0, 0 );
-#else
                Debug( LDAP_DEBUG_ANY,
                        "backend_startup: %d databases to startup.\n",
                        nBackendDB, 0, 0 );
-#endif
                return 1;
        }
 
@@ -346,14 +241,9 @@ int backend_startup(Backend *be)
                if ( be->bd_info->bi_open ) {
                        rc = be->bd_info->bi_open( be->bd_info );
                        if ( rc != 0 ) {
-#ifdef NEW_LOGGING
-                               LDAP_LOG( BACKEND, CRIT,
-                                       "backend_startup: bi_open failed!\n", 0, 0, 0 );
-#else
                                Debug( LDAP_DEBUG_ANY,
                                        "backend_startup: bi_open failed!\n",
                                        0, 0, 0 );
-#endif
 
                                return rc;
                        }
@@ -366,96 +256,51 @@ int backend_startup(Backend *be)
        if ( frontendDB->bd_info->bi_db_open ) {
                rc = frontendDB->bd_info->bi_db_open( frontendDB );
                if ( rc != 0 ) {
-#ifdef NEW_LOGGING
-                       LDAP_LOG( BACKEND, CRIT, 
-                               "backend_startup: bi_db_open(frontend) failed! (%d)\n",
-                               rc, 0, 0 );
-#else
                        Debug( LDAP_DEBUG_ANY,
                                "backend_startup: bi_db_open(frontend) failed! (%d)\n",
                                rc, 0, 0 );
-#endif
                        return rc;
                }
        }
 
        /* open each backend type */
-       for( i = 0; i < nBackendInfo; i++ ) {
-               if( backendInfo[i].bi_nDB == 0) {
+       i = -1;
+       LDAP_STAILQ_FOREACH(bi, &backendInfo, bi_next) {
+               i++;
+               if( bi->bi_nDB == 0) {
                        /* no database of this type, don't open */
                        continue;
                }
 
-               if( backendInfo[i].bi_open ) {
-                       rc = backendInfo[i].bi_open(
-                               &backendInfo[i] );
+               if( bi->bi_open ) {
+                       rc = bi->bi_open( bi );
                        if ( rc != 0 ) {
-#ifdef NEW_LOGGING
-                               LDAP_LOG( BACKEND, CRIT, 
-                                       "backend_startup: bi_open %d failed!\n", i, 0, 0 );
-#else
                                Debug( LDAP_DEBUG_ANY,
-                                       "backend_startup: bi_open %d failed!\n",
-                                       i, 0, 0 );
-#endif
+                                       "backend_startup: bi_open %d (%s) failed!\n",
+                                       i, bi->bi_type, 0 );
                                return rc;
                        }
                }
-       }
 
-       ldap_pvt_thread_mutex_init( &syncrepl_rq.rq_mutex );
-       LDAP_STAILQ_INIT( &syncrepl_rq.task_list );
-       LDAP_STAILQ_INIT( &syncrepl_rq.run_list );
+               (void)backend_init_controls( bi );
+       }
 
        /* open each backend database */
-       for( i = 0; i < nBackendDB; i++ ) {
-               if ( backendDB[i].be_suffix == NULL ) {
-#ifdef NEW_LOGGING
-                       LDAP_LOG( BACKEND, CRIT, 
-                               "backend_startup: warning, database %d (%s) "
-                               "has no suffix\n",
-                               i, backendDB[i].bd_info->bi_type, 0 );
-#else
+       i = -1;
+       LDAP_STAILQ_FOREACH(be, &backendDB, be_next) {
+               i++;
+               if ( be->be_suffix == NULL ) {
                        Debug( LDAP_DEBUG_ANY,
                                "backend_startup: warning, database %d (%s) "
                                "has no suffix\n",
-                               i, backendDB[i].bd_info->bi_type, 0 );
-#endif
+                               i, be->bd_info->bi_type, 0 );
                }
                /* append global access controls */
-               acl_append( &backendDB[i].be_acl, frontendDB->be_acl );
+               acl_append( &be->be_acl, frontendDB->be_acl, -1 );
 
-               rc = backend_startup_one( &backendDB[i] );
+               rc = backend_startup_one( be );
 
                if ( rc ) return rc;
-
-
-               if ( !LDAP_STAILQ_EMPTY( &backendDB[i].be_syncinfo )) {
-                       syncinfo_t *si;
-
-                       if ( !( backendDB[i].be_search && backendDB[i].be_add &&
-                               backendDB[i].be_modify && backendDB[i].be_delete )) {
-#ifdef NEW_LOGGING
-                               LDAP_LOG( BACKEND, CRIT, 
-                                       "backend_startup: database(%d) does not support "
-                                       "operations required for syncrepl", i, 0, 0 );
-#else
-                               Debug( LDAP_DEBUG_ANY,
-                                       "backend_startup: database(%d) does not support "
-                                       "operations required for syncrepl", i, 0, 0 );
-#endif
-                               continue;
-                       }
-
-                       LDAP_STAILQ_FOREACH( si, &backendDB[i].be_syncinfo, si_next ) {
-                               si->si_be = &backendDB[i];
-                               init_syncrepl( si );
-                               ldap_pvt_thread_mutex_lock( &syncrepl_rq.rq_mutex );
-                               ldap_pvt_runqueue_insert( &syncrepl_rq,
-                                               si->si_interval, do_syncrepl, (void *) si );
-                               ldap_pvt_thread_mutex_unlock( &syncrepl_rq.rq_mutex );
-                       }
-               }
        }
 
        return rc;
@@ -463,20 +308,22 @@ int backend_startup(Backend *be)
 
 int backend_num( Backend *be )
 {
-       int i;
+       int i = 0;
+       BackendDB *b2;
 
        if( be == NULL ) return -1;
 
-       for( i = 0; i < nBackendDB; i++ ) {
-               if( be == &backendDB[i] ) return i;
+       LDAP_STAILQ_FOREACH( b2, &backendDB, be_next ) {
+               if( be == b2 ) return i;
+               i++;
        }
        return -1;
 }
 
 int backend_shutdown( Backend *be )
 {
-       int i;
        int rc = 0;
+       BackendInfo *bi;
 
        if( be != NULL ) {
                /* shutdown a specific backend database */
@@ -498,35 +345,27 @@ int backend_shutdown( Backend *be )
        }
 
        /* close each backend database */
-       for( i = 0; i < nBackendDB; i++ ) {
-               if ( backendDB[i].bd_info->bi_db_close ) {
-                       backendDB[i].bd_info->bi_db_close(
-                               &backendDB[i] );
+       LDAP_STAILQ_FOREACH( be, &backendDB, be_next ) {
+               if ( be->bd_info->bi_db_close ) {
+                       be->bd_info->bi_db_close( be );
                }
 
                if(rc != 0) {
-#ifdef NEW_LOGGING
-                       LDAP_LOG( BACKEND, NOTICE, 
-                               "backend_shutdown: bi_db_close %s failed!\n",
-                               backendDB[i].be_type, 0, 0 );
-#else
                        Debug( LDAP_DEBUG_ANY,
                                "backend_close: bi_db_close %s failed!\n",
-                               backendDB[i].be_type, 0, 0 );
-#endif
+                               be->be_type, 0, 0 );
                }
        }
 
        /* close each backend type */
-       for( i = 0; i < nBackendInfo; i++ ) {
-               if( backendInfo[i].bi_nDB == 0 ) {
+       LDAP_STAILQ_FOREACH( bi, &backendInfo, bi_next ) {
+               if( bi->bi_nDB == 0 ) {
                        /* no database of this type */
                        continue;
                }
 
-               if( backendInfo[i].bi_close ) {
-                       backendInfo[i].bi_close(
-                               &backendInfo[i] );
+               if( bi->bi_close ) {
+                       bi->bi_close( bi );
                }
        }
 
@@ -534,83 +373,127 @@ int backend_shutdown( Backend *be )
        if ( frontendDB->bd_info->bi_db_close ) {
                rc = frontendDB->bd_info->bi_db_close ( frontendDB );
                if ( rc != 0 ) {
-#ifdef NEW_LOGGING
-                       LDAP_LOG( BACKEND, CRIT, 
-                               "backend_startup: bi_db_close(frontend) failed! (%d)\n",
-                               rc, 0, 0 );
-#else
                        Debug( LDAP_DEBUG_ANY,
                                "backend_startup: bi_db_close(frontend) failed! (%d)\n",
                                rc, 0, 0 );
-#endif
                }
        }
 
        return 0;
 }
 
+void backend_destroy_one( BackendDB *bd, int dynamic )
+{
+       if ( dynamic ) {
+               LDAP_STAILQ_REMOVE(&backendDB, bd, slap_backend_db, be_next );
+       }
+
+       if ( bd->be_syncinfo ) {
+               syncinfo_free( bd->be_syncinfo );
+       }
+
+       if ( bd->be_pending_csn_list ) {
+               struct slap_csn_entry *csne;
+               csne = LDAP_TAILQ_FIRST( bd->be_pending_csn_list );
+               while ( csne ) {
+                       struct slap_csn_entry *tmp_csne = csne;
+
+                       LDAP_TAILQ_REMOVE( bd->be_pending_csn_list, csne, ce_csn_link );
+                       ch_free( csne->ce_csn.bv_val );
+                       csne = LDAP_TAILQ_NEXT( csne, ce_csn_link );
+                       ch_free( tmp_csne );
+               }
+               ch_free( bd->be_pending_csn_list );
+       }
+
+       if ( bd->bd_info->bi_db_destroy ) {
+               bd->bd_info->bi_db_destroy( bd );
+       }
+       ber_bvarray_free( bd->be_suffix );
+       ber_bvarray_free( bd->be_nsuffix );
+       if ( !BER_BVISNULL( &bd->be_rootdn ) ) {
+               free( bd->be_rootdn.bv_val );
+       }
+       if ( !BER_BVISNULL( &bd->be_rootndn ) ) {
+               free( bd->be_rootndn.bv_val );
+       }
+       if ( !BER_BVISNULL( &bd->be_rootpw ) ) {
+               free( bd->be_rootpw.bv_val );
+       }
+       acl_destroy( bd->be_acl, frontendDB->be_acl );
+       limits_destroy( bd->be_limits );
+       if ( bd->be_replogfile ) {
+               ch_free( bd->be_replogfile );
+       }
+       destroy_replica_info( bd );
+       if ( !BER_BVISNULL( &bd->be_update_ndn ) ) {
+               ch_free( bd->be_update_ndn.bv_val );
+       }
+       if ( bd->be_update_refs ) {
+               ber_bvarray_free( bd->be_update_refs );
+       }
+
+       if ( dynamic ) {
+               free( bd );
+       }
+}
+
 int backend_destroy(void)
 {
-       int i;
        BackendDB *bd;
-
-       ldap_pvt_thread_pool_destroy( &syncrepl_pool, 1 );
+       BackendInfo *bi;
 
        /* destroy each backend database */
-       for( i = 0, bd = backendDB; i < nBackendDB; i++, bd++ ) {
-               if ( bd->bd_info->bi_db_destroy ) {
-                       bd->bd_info->bi_db_destroy( bd );
-               }
-               ber_bvarray_free( bd->be_suffix );
-               ber_bvarray_free( bd->be_nsuffix );
-               if ( bd->be_rootdn.bv_val ) free( bd->be_rootdn.bv_val );
-               if ( bd->be_rootndn.bv_val ) free( bd->be_rootndn.bv_val );
-               if ( bd->be_rootpw.bv_val ) free( bd->be_rootpw.bv_val );
-               if ( bd->be_context_csn.bv_val ) free( bd->be_context_csn.bv_val );
-               acl_destroy( bd->be_acl, frontendDB->be_acl );
+       while (( bd = LDAP_STAILQ_FIRST(&backendDB))) {
+               backend_destroy_one( bd, 1 );
        }
-       free( backendDB );
 
        /* destroy each backend type */
-       for( i = 0; i < nBackendInfo; i++ ) {
-               if( backendInfo[i].bi_destroy ) {
-                       backendInfo[i].bi_destroy(
-                               &backendInfo[i] );
+       LDAP_STAILQ_FOREACH( bi, &backendInfo, bi_next ) {
+               if( bi->bi_destroy ) {
+                       bi->bi_destroy( bi );
                }
        }
 
-#ifdef SLAPD_MODULES
-       if (backendInfo != binfo) {
-          free(backendInfo);
-       }
-#endif /* SLAPD_MODULES */
-
        nBackendInfo = 0;
-       backendInfo = NULL;
+       LDAP_STAILQ_INIT(&backendInfo);
 
        /* destroy frontend database */
        bd = frontendDB;
-       if ( bd->bd_info->bi_db_destroy ) {
-               bd->bd_info->bi_db_destroy( bd );
+       if ( bd ) {
+               if ( bd->bd_info->bi_db_destroy ) {
+                       bd->bd_info->bi_db_destroy( bd );
+               }
+               ber_bvarray_free( bd->be_suffix );
+               ber_bvarray_free( bd->be_nsuffix );
+               if ( !BER_BVISNULL( &bd->be_rootdn ) ) {
+                       free( bd->be_rootdn.bv_val );
+               }
+               if ( !BER_BVISNULL( &bd->be_rootndn ) ) {
+                       free( bd->be_rootndn.bv_val );
+               }
+               if ( !BER_BVISNULL( &bd->be_rootpw ) ) {
+                       free( bd->be_rootpw.bv_val );
+               }
+               acl_destroy( bd->be_acl, frontendDB->be_acl );
+
+               if ( bd->be_replogfile != NULL ) {
+                       free( bd->be_replogfile );
+               }
+               assert( bd->be_replica == NULL );
        }
-       ber_bvarray_free( bd->be_suffix );
-       ber_bvarray_free( bd->be_nsuffix );
-       if ( bd->be_rootdn.bv_val ) free( bd->be_rootdn.bv_val );
-       if ( bd->be_rootndn.bv_val ) free( bd->be_rootndn.bv_val );
-       if ( bd->be_rootpw.bv_val ) free( bd->be_rootpw.bv_val );
-       acl_destroy( bd->be_acl, frontendDB->be_acl );
 
        return 0;
 }
 
 BackendInfo* backend_info(const char *type)
 {
-       int i;
+       BackendInfo *bi;
 
        /* search for the backend type */
-       for( i = 0; i < nBackendInfo; i++ ) {
-               if( strcasecmp(backendInfo[i].bi_type, type) == 0 ) {
-                       return &backendInfo[i];
+       LDAP_STAILQ_FOREACH(bi,&backendInfo,bi_next) {
+               if( strcasecmp(bi->bi_type, type) == 0 ) {
+                       return bi;
                }
        }
 
@@ -620,9 +503,9 @@ BackendInfo* backend_info(const char *type)
 
 BackendDB *
 backend_db_init(
-    const char *type )
+    const char *type,
+       BackendDB *be )
 {
-       Backend *be;
        BackendInfo *bi = backend_info(type);
        int     rc = 0;
 
@@ -631,25 +514,17 @@ backend_db_init(
                return NULL;
        }
 
-       be = backendDB;
-
-       backendDB = (BackendDB *) ch_realloc(
-                       (char *) backendDB,
-                   (nBackendDB + 1) * sizeof(Backend) );
-
-       memset( &backendDB[nbackends], '\0', sizeof(Backend) );
-
-       /* did realloc move our table? if so, fix up dependent pointers */
-       if ( be != backendDB ) {
-               int i;
-               for ( i=0, be=backendDB; i<nbackends; i++, be++ ) {
-                       be->be_pcl_mutexp = &be->be_pcl_mutex;
-               }
+       /* If be is provided, treat it as private. Otherwise allocate
+        * one and add it to the global list.
+        */
+       if ( !be ) {
+               be = ch_calloc( 1, sizeof(Backend) );
+               nbackends++;
+               LDAP_STAILQ_INSERT_TAIL(&backendDB, be, be_next);
        }
 
-       be = &backends[nbackends++];
-
        be->bd_info = bi;
+
        be->be_def_limit = frontendDB->be_def_limit;
        be->be_dfltaccess = frontendDB->be_dfltaccess;
 
@@ -657,21 +532,17 @@ backend_db_init(
        be->be_requires = frontendDB->be_requires;
        be->be_ssf_set = frontendDB->be_ssf_set;
 
-       be->be_context_csn.bv_len = 0;
-       be->be_context_csn.bv_val = NULL;
        be->be_pcl_mutexp = &be->be_pcl_mutex;
        ldap_pvt_thread_mutex_init( be->be_pcl_mutexp );
 
-       LDAP_STAILQ_INIT( &be->be_syncinfo );
-
        /* assign a default depth limit for alias deref */
        be->be_max_deref_depth = SLAPD_DEFAULT_MAXDEREFDEPTH; 
 
-       if(bi->bi_db_init) {
+       if ( bi->bi_db_init ) {
                rc = bi->bi_db_init( be );
        }
 
-       if(rc != 0) {
+       if ( rc != 0 ) {
                fprintf( stderr, "database init failed (%s)\n", type );
                nbackends--;
                return NULL;
@@ -684,17 +555,18 @@ backend_db_init(
 void
 be_db_close( void )
 {
-       int     i;
+       BackendDB *be;
 
-       for ( i = 0; i < nbackends; i++ ) {
-               if ( backends[i].bd_info->bi_db_close ) {
-                       (*backends[i].bd_info->bi_db_close)( &backends[i] );
+       LDAP_STAILQ_FOREACH( be, &backendDB, be_next ) {
+               if ( be->bd_info->bi_db_close ) {
+                       be->bd_info->bi_db_close( be );
                }
        }
 
        if ( frontendDB->bd_info->bi_db_close ) {
                (*frontendDB->bd_info->bi_db_close)( frontendDB );
        }
+
 }
 
 Backend *
@@ -703,21 +575,23 @@ select_backend(
        int manageDSAit,
        int noSubs )
 {
-       int     i, j;
-       ber_len_t len, dnlen = dn->bv_len;
-       Backend *be = NULL;
+       int             j;
+       ber_len_t       len, dnlen = dn->bv_len;
+       Backend         *be, *b2 = NULL;
 
-       for ( i = 0; i < nbackends; i++ ) {
-               for ( j = 0; backends[i].be_nsuffix != NULL &&
-                   backends[i].be_nsuffix[j].bv_val != NULL; j++ )
+       LDAP_STAILQ_FOREACH( be, &backendDB, be_next ) {
+               if ( be->be_nsuffix == NULL ) {
+                       continue;
+               }
+
+               for ( j = 0; !BER_BVISNULL( &be->be_nsuffix[j] ); j++ )
                {
-                       if ( ( SLAP_GLUE_SUBORDINATE( &backends[i] ) )
-                               && noSubs )
+                       if ( ( SLAP_GLUE_SUBORDINATE( be ) ) && noSubs )
                        {
                                continue;
                        }
 
-                       len = backends[i].be_nsuffix[j].bv_len;
+                       len = be->be_nsuffix[j].bv_len;
 
                        if ( len > dnlen ) {
                                /* suffix is longer than DN */
@@ -734,25 +608,31 @@ select_backend(
                                continue;
                        }
 
-                       if ( strcmp( backends[i].be_nsuffix[j].bv_val,
+                       if ( strcmp( be->be_nsuffix[j].bv_val,
                                &dn->bv_val[dnlen-len] ) == 0 )
                        {
-                               if( be == NULL ) {
-                                       be = &backends[i];
+                               if( b2 == NULL ) {
+                                       b2 = be;
 
                                        if( manageDSAit && len == dnlen &&
                                                !SLAP_GLUE_SUBORDINATE( be ) ) {
                                                continue;
                                        }
                                } else {
-                                       be = &backends[i];
+                                       /* If any parts of the tree are glued, use the first
+                                        * match regardless of manageDSAit. Otherwise use the
+                                        * last match.
+                                        */
+                                       if( !( SLAP_DBFLAGS( be ) & ( SLAP_DBFLAG_GLUE_INSTANCE |
+                                               SLAP_DBFLAG_GLUE_SUBORDINATE )))
+                                               b2 = be;
                                }
-                               return be;
+                               return b2;
                        }
                }
        }
 
-       return be;
+       return b2;
 }
 
 int
@@ -762,58 +642,49 @@ be_issuffix(
 {
        int     i;
 
-       for ( i = 0;
-               be->be_nsuffix != NULL && be->be_nsuffix[i].bv_val != NULL;
-               i++ )
-       {
+       if ( be->be_nsuffix == NULL ) {
+               return 0;
+       }
+
+       for ( i = 0; !BER_BVISNULL( &be->be_nsuffix[i] ); i++ ) {
                if ( bvmatch( &be->be_nsuffix[i], bvsuffix ) ) {
-                       return( 1 );
+                       return 1;
                }
        }
 
-       return( 0 );
+       return 0;
 }
 
 int
 be_isroot_dn( Backend *be, struct berval *ndn )
 {
-       if ( !ndn->bv_len ) {
-               return( 0 );
-       }
-
-       if ( !be->be_rootndn.bv_len ) {
-               return( 0 );
+       if ( BER_BVISEMPTY( ndn ) || BER_BVISEMPTY( &be->be_rootndn ) ) {
+               return 0;
        }
 
        return dn_match( &be->be_rootndn, ndn );
 }
 
-int
-be_sync_update( Operation *op )
-{
-       return ( SLAP_SYNC_SHADOW( op->o_bd ) && syncrepl_isupdate( op ) );
-}
-
 int
 be_slurp_update( Operation *op )
 {
        return ( SLAP_SLURP_SHADOW( op->o_bd ) &&
-               be_isupdate_dn( op->o_bd, &op->o_ndn ));
+               be_isupdate_dn( op->o_bd, &op->o_ndn ) );
 }
 
 int
 be_shadow_update( Operation *op )
 {
-       return ( SLAP_SHADOW( op->o_bd ) &&
-               ( syncrepl_isupdate( op ) || be_isupdate_dn( op->o_bd, &op->o_ndn )));
+       return ( SLAP_SYNC_SHADOW( op->o_bd ) ||
+               ( SLAP_SHADOW( op->o_bd ) && be_isupdate_dn( op->o_bd, &op->o_ndn ) ) );
 }
 
 int
 be_isupdate_dn( Backend *be, struct berval *ndn )
 {
-       if ( !ndn->bv_len ) return( 0 );
-
-       if ( !be->be_update_ndn.bv_len ) return( 0 );
+       if ( BER_BVISEMPTY( ndn ) || BER_BVISEMPTY( &be->be_update_ndn ) ) {
+               return 0;
+       }
 
        return dn_match( &be->be_update_ndn, ndn );
 }
@@ -839,24 +710,19 @@ be_isroot_pw( Operation *op )
                return 0;
        }
 
-       if( op->o_bd->be_rootpw.bv_len == 0 ) {
+       if ( BER_BVISEMPTY( &op->o_bd->be_rootpw ) ) {
                return 0;
        }
 
-#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
-       ldap_pvt_thread_mutex_lock( &passwd_mutex );
 #ifdef SLAPD_SPASSWD
-       lutil_passwd_sasl_conn = op->o_conn->c_sasl_authctx;
-#endif
+       ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind,
+               op->o_conn->c_sasl_authctx, NULL );
 #endif
 
        result = lutil_passwd( &op->o_bd->be_rootpw, &op->orb_cred, NULL, NULL );
 
-#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 #ifdef SLAPD_SPASSWD
-       lutil_passwd_sasl_conn = NULL;
-#endif
-       ldap_pvt_thread_mutex_unlock( &passwd_mutex );
+       ldap_pvt_thread_pool_setkey( op->o_threadctx, slap_sasl_bind, NULL, NULL );
 #endif
 
        return result == 0;
@@ -881,55 +747,13 @@ be_entry_release_rw(
 int
 backend_unbind( Operation *op, SlapReply *rs )
 {
-       int             i;
-
-       for ( i = 0; i < nbackends; i++ ) {
-#if defined( LDAP_SLAPI )
-               if ( op->o_pb ) {
-                       int rc;
-                       if ( i == 0 ) slapi_int_pblock_set_operation( op->o_pb, op );
-                       slapi_pblock_set( op->o_pb, SLAPI_BACKEND, (void *)&backends[i] );
-                       rc = slapi_int_call_plugins( &backends[i],
-                               SLAPI_PLUGIN_PRE_UNBIND_FN, (Slapi_PBlock *)op->o_pb );
-                       if ( rc < 0 ) {
-                               /*
-                                * A preoperation plugin failure will abort the
-                                * entire operation.
-                                */
-#ifdef NEW_LOGGING
-                               LDAP_LOG( OPERATION, INFO,
-                                       "do_bind: Unbind preoperation plugin failed\n",
-                                       0, 0, 0);
-#else
-                               Debug(LDAP_DEBUG_TRACE,
-                                       "do_bind: Unbind preoperation plugin failed\n",
-                                       0, 0, 0);
-#endif
-                               return 0;
-                       }
-               }
-#endif /* defined( LDAP_SLAPI ) */
-
-               if ( backends[i].be_unbind ) {
-                       op->o_bd = &backends[i];
-                       (*backends[i].be_unbind)( op, rs );
-               }
+       BackendDB *be;
 
-#if defined( LDAP_SLAPI )
-               if ( op->o_pb != NULL && slapi_int_call_plugins( &backends[i],
-                       SLAPI_PLUGIN_POST_UNBIND_FN, (Slapi_PBlock *)op->o_pb ) < 0 )
-               {
-#ifdef NEW_LOGGING
-                       LDAP_LOG( OPERATION, INFO,
-                               "do_unbind: Unbind postoperation plugins failed\n",
-                               0, 0, 0);
-#else
-                       Debug(LDAP_DEBUG_TRACE,
-                               "do_unbind: Unbind postoperation plugins failed\n",
-                               0, 0, 0);
-#endif
+       LDAP_STAILQ_FOREACH( be, &backendDB, be_next ) {
+               if ( be->be_unbind ) {
+                       op->o_bd = be;
+                       be->be_unbind( op, rs );
                }
-#endif /* defined( LDAP_SLAPI ) */
        }
 
        return 0;
@@ -939,11 +763,11 @@ int
 backend_connection_init(
        Connection   *conn )
 {
-       int     i;
+       BackendDB *be;
 
-       for ( i = 0; i < nbackends; i++ ) {
-               if ( backends[i].be_connection_init ) {
-                       (*backends[i].be_connection_init)( &backends[i], conn);
+       LDAP_STAILQ_FOREACH( be, &backendDB, be_next ) {
+               if ( be->be_connection_init ) {
+                       be->be_connection_init( be, conn );
                }
        }
 
@@ -954,18 +778,18 @@ int
 backend_connection_destroy(
        Connection   *conn )
 {
-       int     i;
+       BackendDB *be;
 
-       for ( i = 0; i < nbackends; i++ ) {
-               if ( backends[i].be_connection_destroy ) {
-                       (*backends[i].be_connection_destroy)( &backends[i], conn);
+       LDAP_STAILQ_FOREACH( be, &backendDB, be_next ) {
+               if ( be->be_connection_destroy ) {
+                       be->be_connection_destroy( be, conn);
                }
        }
 
        return 0;
 }
 
-static int
+int
 backend_check_controls(
        Operation *op,
        SlapReply *rs )
@@ -975,16 +799,65 @@ backend_check_controls(
 
        if( ctrls ) {
                for( ; *ctrls != NULL ; ctrls++ ) {
-                       if( (*ctrls)->ldctl_iscritical && !ldap_charray_inlist(
-                               op->o_bd->be_controls, (*ctrls)->ldctl_oid ) )
-                       {
-                               rs->sr_text = "control unavailable in context";
-                               rs->sr_err = LDAP_UNAVAILABLE_CRITICAL_EXTENSION;
+                       int cid;
+
+                       switch ( slap_global_control( op, (*ctrls)->ldctl_oid, &cid ) ) {
+                       case LDAP_CONTROL_NOT_FOUND:
+                               /* unrecognized control */ 
+                               if ( (*ctrls)->ldctl_iscritical ) {
+                                       /* should not be reachable */ 
+                                       Debug( LDAP_DEBUG_ANY,
+                                               "backend_check_controls: unrecognized control: %s\n",
+                                               (*ctrls)->ldctl_oid, 0, 0 );
+                                       assert( 0 );
+                               }
                                break;
+
+                       case LDAP_COMPARE_FALSE:
+                               if ( !op->o_bd->be_ctrls[cid] && (*ctrls)->ldctl_iscritical ) {
+                                       /* Per RFC 2251 (and LDAPBIS discussions), if the control
+                                        * is recognized and appropriate for the operation (which
+                                        * we've already verified), then the server should make
+                                        * use of the control when performing the operation.
+                                        * 
+                                        * Here we find that operation extended by the control
+                                        * is unavailable in a particular context, and the control
+                                        * is marked Critical, hence the return of
+                                        * unwillingToPerform.
+                                        */
+                                       rs->sr_text = "critical control unavailable in context";
+                                       rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
+                                       goto done;
+                               }
+                               break;
+
+                       case LDAP_COMPARE_TRUE:
+                               break;
+
+                       default:
+                               /* unreachable */
+                               Debug( LDAP_DEBUG_ANY,
+                                       "backend_check_controls: unable to check control: %s\n",
+                                       (*ctrls)->ldctl_oid, 0, 0 );
+                               assert( 0 );
+
+                               rs->sr_text = "unable to check control";
+                               rs->sr_err = LDAP_OTHER;
+                               goto done;
                        }
                }
        }
 
+       /* temporarily removed */
+#if 0
+       /* check should be generalized */
+       if( get_manageDIT(op) && !be_isroot(op)) {
+               rs->sr_text = "requires manager authorization";
+               rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
+       }
+#endif
+
+done:;
        return rs->sr_err;
 }
 
@@ -1003,8 +876,18 @@ backend_check_restrictions(
        int starttls = 0;
        int session = 0;
 
-       if( op->o_bd ) {
-               if ( backend_check_controls( op, rs ) != LDAP_SUCCESS ) {
+       if ( op->o_bd ) {
+               int     rc = SLAP_CB_CONTINUE;
+
+               if ( op->o_bd->be_chk_controls ) {
+                       rc = ( *op->o_bd->be_chk_controls )( op, rs );
+               }
+
+               if ( rc == SLAP_CB_CONTINUE ) {
+                       rc = backend_check_controls( op, rs );
+               }
+
+               if ( rc != LDAP_SUCCESS ) {
                        return rs->sr_err;
                }
 
@@ -1170,7 +1053,7 @@ backend_check_restrictions(
                        }
 
                        if( !( global_allows & SLAP_ALLOW_UPDATE_ANON ) &&
-                               op->o_ndn.bv_len == 0 )
+                               BER_BVISEMPTY( &op->o_ndn ) )
                        {
                                rs->sr_text = "modifications require authentication";
                                rs->sr_err = LDAP_STRONG_AUTH_REQUIRED;
@@ -1178,7 +1061,10 @@ backend_check_restrictions(
                        }
 
 #ifdef SLAP_X_LISTENER_MOD
-                       if ( op->o_conn->c_listener && ! ( op->o_conn->c_listener->sl_perms & ( op->o_ndn.bv_len > 0 ? S_IWUSR : S_IWOTH ) ) ) {
+                       if ( op->o_conn->c_listener &&
+                               ! ( op->o_conn->c_listener->sl_perms & ( !BER_BVISEMPTY( &op->o_ndn )
+                                       ? (S_IWUSR|S_IWOTH) : S_IWOTH ) ) )
+                       {
                                /* no "w" mode means readonly */
                                rs->sr_text = "modifications not allowed on this listener";
                                rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
@@ -1195,7 +1081,7 @@ backend_check_restrictions(
                        /* should check mechanism */
                        if( ( op->o_transport_ssf < ssf->sss_transport
                                && op->o_authtype == LDAP_AUTH_SIMPLE )
-                               || op->o_dn.bv_len == 0 )
+                               || BER_BVISEMPTY( &op->o_dn ) )
                        {
                                rs->sr_text = "strong(er) authentication required";
                                rs->sr_err = LDAP_STRONG_AUTH_REQUIRED;
@@ -1204,7 +1090,7 @@ backend_check_restrictions(
                }
 
                if( requires & SLAP_REQUIRE_SASL ) {
-                       if( op->o_authtype != LDAP_AUTH_SASL || op->o_dn.bv_len == 0 ) {
+                       if( op->o_authtype != LDAP_AUTH_SASL || BER_BVISEMPTY( &op->o_dn ) ) {
                                rs->sr_text = "SASL authentication required";
                                rs->sr_err = LDAP_STRONG_AUTH_REQUIRED;
                                return rs->sr_err;
@@ -1212,7 +1098,7 @@ backend_check_restrictions(
                }
                        
                if( requires & SLAP_REQUIRE_AUTHC ) {
-                       if( op->o_dn.bv_len == 0 ) {
+                       if( BER_BVISEMPTY( &op->o_dn ) ) {
                                rs->sr_text = "authentication required";
                                rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
                                return rs->sr_err;
@@ -1243,7 +1129,7 @@ backend_check_restrictions(
                }
 
 #ifdef SLAP_X_LISTENER_MOD
-               if ( !starttls && op->o_dn.bv_len == 0 ) {
+               if ( !starttls && BER_BVISEMPTY( &op->o_dn ) ) {
                        if ( op->o_conn->c_listener &&
                                !( op->o_conn->c_listener->sl_perms & S_IXOTH ))
                {
@@ -1257,7 +1143,8 @@ backend_check_restrictions(
                if ( !starttls && !updateop ) {
                        if ( op->o_conn->c_listener &&
                                !( op->o_conn->c_listener->sl_perms &
-                                       ( op->o_dn.bv_len > 0 ? S_IRUSR : S_IROTH )))
+                                       ( !BER_BVISEMPTY( &op->o_dn )
+                                               ? (S_IRUSR|S_IROTH) : S_IROTH )))
                        {
                                /* no "r" mode means no read */
                                rs->sr_text = "read not allowed on this listener";
@@ -1310,23 +1197,21 @@ be_entry_get_rw(
        int rw,
        Entry **e )
 {
-       int rc;
-
        *e = NULL;
 
-       if (op->o_bd == NULL) {
-               rc = LDAP_NO_SUCH_OBJECT;
-       } else if ( op->o_bd->be_fetch ) {
-               rc = ( op->o_bd->be_fetch )( op, ndn,
-                       oc, at, rw, e );
-       } else {
-               rc = LDAP_UNWILLING_TO_PERFORM;
+       if ( op->o_bd == NULL ) {
+               return LDAP_NO_SUCH_OBJECT;
        }
-       return rc;
+
+       if ( op->o_bd->be_fetch ) {
+               return op->o_bd->be_fetch( op, ndn, oc, at, rw, e );
+       }
+
+       return LDAP_UNWILLING_TO_PERFORM;
 }
 
 int 
-backend_group(
+fe_acl_group(
        Operation *op,
        Entry   *target,
        struct berval *gr_ndn,
@@ -1335,24 +1220,26 @@ backend_group(
        AttributeDescription *group_at )
 {
        Entry *e;
+       void *o_priv = op->o_private, *e_priv = NULL;
        Attribute *a;
        int rc;
        GroupAssertion *g;
        Backend *be = op->o_bd;
 
-       if ( op->o_abandon ) return SLAPD_ABANDON;
-
        op->o_bd = select_backend( gr_ndn, 0, 0 );
 
-       for (g = op->o_groups; g; g=g->ga_next) {
-               if (g->ga_be != op->o_bd || g->ga_oc != group_oc ||
-                       g->ga_at != group_at || g->ga_len != gr_ndn->bv_len)
+       for ( g = op->o_groups; g; g = g->ga_next ) {
+               if ( g->ga_be != op->o_bd || g->ga_oc != group_oc ||
+                       g->ga_at != group_at || g->ga_len != gr_ndn->bv_len )
+               {
                        continue;
-               if (strcmp( g->ga_ndn, gr_ndn->bv_val ) == 0)
+               }
+               if ( strcmp( g->ga_ndn, gr_ndn->bv_val ) == 0 ) {
                        break;
+               }
        }
 
-       if (g) {
+       if ( g ) {
                rc = g->ga_res;
                goto done;
        }
@@ -1361,20 +1248,12 @@ backend_group(
                e = target;
                rc = 0;
        } else {
-               rc = be_entry_get_rw(op, gr_ndn, group_oc, group_at, 0, &e );
+               op->o_private = NULL;
+               rc = be_entry_get_rw( op, gr_ndn, group_oc, group_at, 0, &e );
+               e_priv = op->o_private;
+               op->o_private = o_priv;
        }
        if ( e ) {
-#ifdef LDAP_SLAPI
-               if ( op->o_pb != NULL ) {
-                       init_group_pblock( op, target, e, op_ndn, group_at );
-
-                       rc = call_group_preop_plugins( op );
-                       if ( rc == LDAP_SUCCESS ) {
-                               goto done;
-                       }
-               }
-#endif /* LDAP_SLAPI */
-
                a = attr_find( e->e_attrs, group_at );
                if ( a ) {
                        /* If the attribute is a subtype of labeledURI, treat this as
@@ -1388,27 +1267,31 @@ backend_group(
                                struct berval bv, nbase;
                                Filter *filter;
                                Entry *user;
+                               void *user_priv = NULL;
                                Backend *b2 = op->o_bd;
 
                                if ( target && dn_match( &target->e_nname, op_ndn ) ) {
                                        user = target;
                                } else {
                                        op->o_bd = select_backend( op_ndn, 0, 0 );
+                                       op->o_private = NULL;
                                        rc = be_entry_get_rw(op, op_ndn, NULL, NULL, 0, &user );
+                                       user_priv = op->o_private;
+                                       op->o_private = o_priv;
                                }
                                
                                if ( rc == 0 ) {
-                                       rc = 1;
-                                       for (i=0; a->a_vals[i].bv_val; i++) {
+                                       rc = LDAP_COMPARE_FALSE;
+                                       for ( i = 0; !BER_BVISNULL( &a->a_vals[i] ); i++ ) {
                                                if ( ldap_url_parse( a->a_vals[i].bv_val, &ludp ) !=
-                                                       LDAP_SUCCESS )
+                                                       LDAP_URL_SUCCESS )
                                                {
                                                        continue;
                                                }
-                                               nbase.bv_val = NULL;
+                                               BER_BVZERO( &nbase );
                                                /* host part must be empty */
                                                /* attrs and extensions parts must be empty */
-                                               if (( ludp->lud_host && *ludp->lud_host ) ||
+                                               if ( ( ludp->lud_host && *ludp->lud_host ) ||
                                                        ludp->lud_attrs || ludp->lud_exts )
                                                {
                                                        goto loopit;
@@ -1419,25 +1302,29 @@ backend_group(
                                                {
                                                        goto loopit;
                                                }
-                                               switch(ludp->lud_scope) {
+                                               switch ( ludp->lud_scope ) {
                                                case LDAP_SCOPE_BASE:
-                                                       if ( !dn_match( &nbase, op_ndn )) goto loopit;
+                                                       if ( !dn_match( &nbase, op_ndn ) ) {
+                                                               goto loopit;
+                                                       }
                                                        break;
                                                case LDAP_SCOPE_ONELEVEL:
-                                                       dnParent(op_ndn, &bv );
-                                                       if ( !dn_match( &nbase, &bv )) goto loopit;
+                                                       dnParent( op_ndn, &bv );
+                                                       if ( !dn_match( &nbase, &bv ) ) {
+                                                               goto loopit;
+                                                       }
                                                        break;
                                                case LDAP_SCOPE_SUBTREE:
-                                                       if ( !dnIsSuffix( op_ndn, &nbase )) goto loopit;
+                                                       if ( !dnIsSuffix( op_ndn, &nbase ) ) {
+                                                               goto loopit;
+                                                       }
                                                        break;
-#ifdef LDAP_SCOPE_SUBORDINATE
                                                case LDAP_SCOPE_SUBORDINATE:
-                                                       if ( dn_match( &nbase, op_ndn ) &&
-                                                               !dnIsSuffix(op_ndn, &nbase ))
+                                                       if ( dn_match( &nbase, op_ndn ) ||
+                                                               !dnIsSuffix( op_ndn, &nbase ) )
                                                        {
                                                                goto loopit;
                                                        }
-#endif
                                                }
                                                filter = str2filter_x( op, ludp->lud_filter );
                                                if ( filter ) {
@@ -1450,13 +1337,15 @@ backend_group(
                                                }
 loopit:
                                                ldap_free_urldesc( ludp );
-                                               if ( nbase.bv_val ) {
+                                               if ( !BER_BVISNULL( &nbase ) ) {
                                                        op->o_tmpfree( nbase.bv_val, op->o_tmpmemctx );
                                                }
                                                if ( rc == 0 ) break;
                                        }
                                        if ( user != target ) {
+                                               op->o_private = user_priv;
                                                be_entry_release_r( op, user );
+                                               op->o_private = o_priv;
                                        }
                                }
                                op->o_bd = b2;
@@ -1465,30 +1354,30 @@ loopit:
                                SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
                                SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
                                a->a_nvals, op_ndn, op->o_tmpmemctx );
+                               if ( rc == LDAP_NO_SUCH_ATTRIBUTE )
+                                       rc = LDAP_COMPARE_FALSE;
                        }
                } else {
                        rc = LDAP_NO_SUCH_ATTRIBUTE;
                }
-               if (e != target ) {
+               if ( e != target ) {
+                       op->o_private = e_priv;
                        be_entry_release_r( op, e );
+                       op->o_private = o_priv;
                }
        } else {
                rc = LDAP_NO_SUCH_OBJECT;
        }
 
-#ifdef LDAP_SLAPI
-       if ( op->o_pb ) call_group_postop_plugins( op );
-#endif /* LDAP_SLAPI */
-
        if ( op->o_tag != LDAP_REQ_BIND && !op->o_do_not_cache ) {
-               g = op->o_tmpalloc(sizeof(GroupAssertion) + gr_ndn->bv_len,
-                       op->o_tmpmemctx);
+               g = op->o_tmpalloc( sizeof( GroupAssertion ) + gr_ndn->bv_len,
+                       op->o_tmpmemctx );
                g->ga_be = op->o_bd;
                g->ga_oc = group_oc;
                g->ga_at = group_at;
                g->ga_res = rc;
                g->ga_len = gr_ndn->bv_len;
-               strcpy(g->ga_ndn, gr_ndn->bv_val);
+               strcpy( g->ga_ndn, gr_ndn->bv_val );
                g->ga_next = op->o_groups;
                op->o_groups = g;
        }
@@ -1498,7 +1387,37 @@ done:
 }
 
 int 
-backend_attribute(
+backend_group(
+       Operation *op,
+       Entry   *target,
+       struct berval *gr_ndn,
+       struct berval *op_ndn,
+       ObjectClass *group_oc,
+       AttributeDescription *group_at )
+{
+       int                     rc;
+       BackendDB               *be_orig;
+
+       if ( op->o_abandon ) {
+               return SLAPD_ABANDON;
+       }
+
+       be_orig = op->o_bd;
+       op->o_bd = frontendDB;
+#ifdef SLAP_OVERLAY_ACCESS
+       rc = frontendDB->be_group( op, target, gr_ndn,
+               op_ndn, group_oc, group_at );
+#else /* ! SLAP_OVERLAY_ACCESS */
+       rc = fe_acl_group( op, target, gr_ndn,
+               op_ndn, group_oc, group_at );
+#endif /* ! SLAP_OVERLAY_ACCESS */
+       op->o_bd = be_orig;
+
+       return rc;
+}
+
+int 
+fe_acl_attribute(
        Operation *op,
        Entry   *target,
        struct berval   *edn,
@@ -1506,60 +1425,237 @@ backend_attribute(
        BerVarray *vals,
        slap_access_t access )
 {
-       Entry *e;
-       Attribute *a;
-       int i, j, rc = LDAP_SUCCESS;
-       AccessControlState acl_state = ACL_STATE_INIT;
-       Backend *be = op->o_bd;
+       Entry                   *e = NULL;
+       void                    *o_priv = op->o_private, *e_priv = NULL;
+       Attribute               *a = NULL;
+       int                     freeattr = 0, i, j, rc = LDAP_SUCCESS;
+       AccessControlState      acl_state = ACL_STATE_INIT;
+       Backend                 *be = op->o_bd;
 
        op->o_bd = select_backend( edn, 0, 0 );
 
        if ( target && dn_match( &target->e_nname, edn ) ) {
                e = target;
+
        } else {
-               rc = be_entry_get_rw(op, edn, NULL, entry_at, 0, &e );
+               op->o_private = NULL;
+               rc = be_entry_get_rw( op, edn, NULL, entry_at, 0, &e );
+               e_priv = op->o_private;
+               op->o_private = o_priv;
        } 
 
        if ( e ) {
                a = attr_find( e->e_attrs, entry_at );
+               if ( a == NULL ) {
+                       SlapReply       rs = { 0 };
+                       AttributeName   anlist[ 2 ];
+
+                       anlist[ 0 ].an_name = entry_at->ad_cname;
+                       anlist[ 0 ].an_desc = entry_at;
+                       BER_BVZERO( &anlist[ 1 ].an_name );
+                       rs.sr_attrs = anlist;
+                       
+                       /* NOTE: backend_operational() is also called
+                        * when returning results, so it's supposed
+                        * to do no harm to entries */
+                       rs.sr_entry = e;
+                       rc = backend_operational( op, &rs );
+                       rs.sr_entry = NULL;
+                       if ( rc == LDAP_SUCCESS ) {
+                               if ( rs.sr_operational_attrs ) {
+                                       freeattr = 1;
+                                       a = rs.sr_operational_attrs;
+
+                               } else {
+                                       rc = LDAP_NO_SUCH_ATTRIBUTE;
+                               }
+                       }
+               }
+
                if ( a ) {
                        BerVarray v;
 
-                       if ( op->o_conn && access > ACL_NONE && access_allowed( op,
-                               e, entry_at, NULL, access,
-                               &acl_state ) == 0 ) {
+                       if ( op->o_conn && access > ACL_NONE &&
+                               access_allowed( op, e, entry_at, NULL,
+                                               access, &acl_state ) == 0 )
+                       {
                                rc = LDAP_INSUFFICIENT_ACCESS;
                                goto freeit;
                        }
 
-                       for ( i=0; a->a_vals[i].bv_val; i++ ) ;
+                       for ( i = 0; !BER_BVISNULL( &a->a_vals[i] ); i++ )
+                               ;
                        
-                       v = op->o_tmpalloc( sizeof(struct berval) * (i+1),
+                       v = op->o_tmpalloc( sizeof(struct berval) * ( i + 1 ),
                                op->o_tmpmemctx );
-                       for ( i=0,j=0; a->a_vals[i].bv_val; i++ ) {
-                               if ( op->o_conn && access > ACL_NONE && access_allowed( op,
-                                       e, entry_at,
-                                       &a->a_nvals[i],
-                                       access, &acl_state ) == 0 ) {
+                       for ( i = 0, j = 0; !BER_BVISNULL( &a->a_vals[i] ); i++ )
+                       {
+                               if ( op->o_conn && access > ACL_NONE && 
+                                       access_allowed( op, e, entry_at,
+                                                       &a->a_nvals[i],
+                                                       access,
+                                                       &acl_state ) == 0 )
+                               {
                                        continue;
                                }
-                               ber_dupbv_x( &v[j],
-                                       &a->a_nvals[i], op->o_tmpmemctx );
-                               if (v[j].bv_val ) j++;
+                               ber_dupbv_x( &v[j], &a->a_nvals[i],
+                                               op->o_tmpmemctx );
+                               if ( !BER_BVISNULL( &v[j] ) ) {
+                                       j++;
+                               }
                        }
-                       if (j == 0) {
+                       if ( j == 0 ) {
                                op->o_tmpfree( v, op->o_tmpmemctx );
                                *vals = NULL;
                                rc = LDAP_INSUFFICIENT_ACCESS;
+
                        } else {
-                               v[j].bv_val = NULL;
-                               v[j].bv_len = 0;
+                               BER_BVZERO( &v[j] );
                                *vals = v;
                                rc = LDAP_SUCCESS;
                        }
                }
-freeit:                if (e != target ) {
+freeit:                if ( e != target ) {
+                       op->o_private = e_priv;
+                       be_entry_release_r( op, e );
+                       op->o_private = o_priv;
+               }
+               if ( freeattr ) {
+                       attr_free( a );
+               }
+       }
+
+       op->o_bd = be;
+       return rc;
+}
+
+int 
+backend_attribute(
+       Operation *op,
+       Entry   *target,
+       struct berval   *edn,
+       AttributeDescription *entry_at,
+       BerVarray *vals,
+       slap_access_t access )
+{
+       int                     rc;
+       BackendDB               *be_orig;
+
+       be_orig = op->o_bd;
+       op->o_bd = frontendDB;
+#ifdef SLAP_OVERLAY_ACCESS
+       rc = frontendDB->be_attribute( op, target, edn,
+               entry_at, vals, access );
+#else /* !SLAP_OVERLAY_ACCESS */
+       rc = fe_acl_attribute( op, target, edn,
+               entry_at, vals, access );
+#endif /* !SLAP_OVERLAY_ACCESS */
+       op->o_bd = be_orig;
+
+       return rc;
+}
+
+int 
+backend_access(
+       Operation               *op,
+       Entry                   *target,
+       struct berval           *edn,
+       AttributeDescription    *entry_at,
+       struct berval           *nval,
+       slap_access_t           access,
+       slap_mask_t             *mask )
+{
+       Entry           *e = NULL;
+       void            *o_priv = op->o_private, *e_priv = NULL;
+       int             rc = LDAP_INSUFFICIENT_ACCESS;
+       Backend         *be = op->o_bd;
+
+       /* pedantic */
+       assert( op != NULL );
+       assert( op->o_conn != NULL );
+       assert( edn != NULL );
+       assert( access > ACL_NONE );
+
+       op->o_bd = select_backend( edn, 0, 0 );
+
+       if ( target && dn_match( &target->e_nname, edn ) ) {
+               e = target;
+
+       } else {
+               op->o_private = NULL;
+               rc = be_entry_get_rw( op, edn, NULL, entry_at, 0, &e );
+               e_priv = op->o_private;
+               op->o_private = o_priv;
+       } 
+
+       if ( e ) {
+               Attribute       *a = NULL;
+               int             freeattr = 0;
+
+               if ( entry_at == NULL ) {
+                       entry_at = slap_schema.si_ad_entry;
+               }
+
+               if ( entry_at == slap_schema.si_ad_entry || entry_at == slap_schema.si_ad_children )
+               {
+                       if ( access_allowed_mask( op, e, entry_at,
+                                       NULL, access, NULL, mask ) == 0 )
+                       {
+                               rc = LDAP_INSUFFICIENT_ACCESS;
+
+                       } else {
+                               rc = LDAP_SUCCESS;
+                       }
+
+               } else {
+                       a = attr_find( e->e_attrs, entry_at );
+                       if ( a == NULL ) {
+                               SlapReply       rs = { 0 };
+                               AttributeName   anlist[ 2 ];
+
+                               anlist[ 0 ].an_name = entry_at->ad_cname;
+                               anlist[ 0 ].an_desc = entry_at;
+                               BER_BVZERO( &anlist[ 1 ].an_name );
+                               rs.sr_attrs = anlist;
+                       
+                               rs.sr_attr_flags = slap_attr_flags( rs.sr_attrs );
+
+                               /* NOTE: backend_operational() is also called
+                                * when returning results, so it's supposed
+                                * to do no harm to entries */
+                               rs.sr_entry = e;
+                               rc = backend_operational( op, &rs );
+                               rs.sr_entry = NULL;
+
+                               if ( rc == LDAP_SUCCESS ) {
+                                       if ( rs.sr_operational_attrs ) {
+                                               freeattr = 1;
+                                               a = rs.sr_operational_attrs;
+
+                                       } else {
+                                               rc = LDAP_NO_SUCH_OBJECT;
+                                       }
+                               }
+                       }
+
+                       if ( a ) {
+                               if ( access_allowed_mask( op, e, entry_at,
+                                               nval, access, NULL, mask ) == 0 )
+                               {
+                                       rc = LDAP_INSUFFICIENT_ACCESS;
+                                       goto freeit;
+                               }
+                               rc = LDAP_SUCCESS;
+                       }
+               }
+freeit:                if ( e != target ) {
+                       op->o_private = e_priv;
                        be_entry_release_r( op, e );
+                       op->o_private = o_priv;
+               }
+               if ( freeattr ) {
+                       attr_free( a );
                }
        }
 
@@ -1567,12 +1663,14 @@ freeit:         if (e != target ) {
        return rc;
 }
 
-int backend_operational(
+int
+fe_aux_operational(
        Operation *op,
        SlapReply *rs )
 {
-       Attribute       **ap;
-       int             rc = 0;
+       Attribute               **ap;
+       int                     rc = 0;
+       BackendDB               *be_orig;
 
        for ( ap = &rs->sr_operational_attrs; *ap; ap = &(*ap)->a_next )
                /* just count them */ ;
@@ -1582,65 +1680,49 @@ int backend_operational(
         * and the backend supports specific operational attributes, 
         * add them to the attribute list
         */
-       if ( SLAP_OPATTRS( rs->sr_attr_flags ) || ( op->ors_attrs &&
-               ad_inlist( slap_schema.si_ad_subschemaSubentry, op->ors_attrs )) ) {
-               *ap = slap_operational_subschemaSubentry( op->o_bd );
+       if ( SLAP_OPATTRS( rs->sr_attr_flags ) || ( rs->sr_attrs &&
+               ad_inlist( slap_schema.si_ad_entryDN, rs->sr_attrs ) ) )
+       {
+               *ap = slap_operational_entryDN( rs->sr_entry );
+               ap = &(*ap)->a_next;
+       }
 
+       if ( SLAP_OPATTRS( rs->sr_attr_flags ) || ( rs->sr_attrs &&
+               ad_inlist( slap_schema.si_ad_subschemaSubentry, rs->sr_attrs ) ) )
+       {
+               *ap = slap_operational_subschemaSubentry( op->o_bd );
                ap = &(*ap)->a_next;
        }
 
-       if ( ( SLAP_OPATTRS( rs->sr_attr_flags ) || op->ors_attrs ) && op->o_bd &&
-               op->o_bd->be_operational != NULL )
+       if ( op->o_bd != NULL )
        {
-               Attribute       *a;
-               
-               a = rs->sr_operational_attrs;
-               rs->sr_operational_attrs = NULL;
-               rc = op->o_bd->be_operational( op, rs );
-               *ap = rs->sr_operational_attrs;
-               if ( a != NULL ) {
-                       rs->sr_operational_attrs = a;
+               /* Let the overlays have a chance at this */
+               be_orig = op->o_bd;
+               op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
+               if ( !be_match( op->o_bd, frontendDB ) &&
+                       ( SLAP_OPATTRS( rs->sr_attr_flags ) || rs->sr_attrs ) &&
+                       op->o_bd != NULL && op->o_bd->be_operational != NULL )
+               {
+                       rc = op->o_bd->be_operational( op, rs );
                }
-
-               for ( ; *ap; ap = &(*ap)->a_next )
-                       /* just count them */ ;
+               op->o_bd = be_orig;
        }
 
        return rc;
 }
 
-#ifdef LDAP_SLAPI
-static void init_group_pblock( Operation *op, Entry *target,
-       Entry *e, struct berval *op_ndn, AttributeDescription *group_at )
-{
-       slapi_int_pblock_set_operation( op->o_pb, op );
-       slapi_pblock_set( op->o_pb, SLAPI_TARGET_DN, (void *)target->e_nname.bv_val );
-       slapi_pblock_set( op->o_pb, SLAPI_X_GROUP_ENTRY, (void *)e );
-       slapi_pblock_set( op->o_pb, SLAPI_X_GROUP_OPERATION_DN, (void *)op_ndn->bv_val );
-       slapi_pblock_set( op->o_pb, SLAPI_X_GROUP_ATTRIBUTE, (void *)group_at->ad_cname.bv_val );
-}
-
-static int call_group_preop_plugins( Operation *op )
+int backend_operational( Operation *op, SlapReply *rs )
 {
        int rc;
+       BackendDB *be_orig;
 
-       rc = slapi_int_call_plugins( op->o_bd, SLAPI_X_PLUGIN_PRE_GROUP_FN, op->o_pb );
-       if ( rc < 0 ) {
-               if (( slapi_pblock_get( op->o_pb, SLAPI_RESULT_CODE,
-                       (void *)&rc ) != 0 ) || rc == LDAP_SUCCESS )
-               {
-                       rc = LDAP_NO_SUCH_ATTRIBUTE;
-               }
-       } else {
-               rc = LDAP_SUCCESS;
-       }
+       /* Moved this into the frontend so global overlays are called */
 
-       return rc;
-}
+       be_orig = op->o_bd;
+       op->o_bd = frontendDB;
+       rc = frontendDB->be_operational( op, rs );
+       op->o_bd = be_orig;
 
-static void call_group_postop_plugins( Operation *op )
-{
-       (void) slapi_int_call_plugins( op->o_bd, SLAPI_X_PLUGIN_POST_GROUP_FN, op->o_pb );
+       return rc;
 }
-#endif /* LDAP_SLAPI */