]> git.sur5r.net Git - openldap/blobdiff - servers/slapd/backover.c
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[openldap] / servers / slapd / backover.c
index eb0bf89c196b5e4aec6603e06a353ded971e96a9..3128840ce9f541c2f470526ae947ab698f1d2327 100644 (file)
@@ -2,7 +2,7 @@
 /* $OpenLDAP$ */
 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
  *
- * Copyright 2003-2005 The OpenLDAP Foundation.
+ * Copyright 2003-2006 The OpenLDAP Foundation.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
 
 #define SLAPD_TOOLS
 #include "slap.h"
+#include "config.h"
 
 static slap_overinst *overlays;
 
-enum db_which { db_open = 0, db_close, db_destroy };
+enum db_which {
+       db_open = 0,
+       db_close,
+       db_destroy,
+       db_last
+};
 
 static int
 over_db_func(
@@ -71,10 +77,13 @@ over_db_config(
        slap_overinfo *oi = be->bd_info->bi_private;
        slap_overinst *on = oi->oi_list;
        BackendInfo *bi_orig = be->bd_info;
+       struct ConfigOCs *be_cf_ocs = be->be_cf_ocs;
+       ConfigArgs ca = {0};
        int rc = 0;
 
        if ( oi->oi_orig->bi_db_config ) {
                be->bd_info = oi->oi_orig;
+               be->be_cf_ocs = oi->oi_orig->bi_cf_ocs;
                rc = oi->oi_orig->bi_db_config( be, fname, lineno,
                        argc, argv );
 
@@ -123,8 +132,27 @@ over_db_config(
                if ( rc != SLAP_CONF_UNKNOWN ) return rc;
        }
 
+       ca.argv = argv;
+       ca.argc = argc;
+       ca.fname = fname;
+       ca.lineno = lineno;
+       ca.be = be;
+       snprintf( ca.log, sizeof( ca.log ), "%s: line %d",
+                       ca.fname, ca.lineno );
+
        for (; on; on=on->on_next) {
-               if (on->on_bi.bi_db_config) {
+               rc = SLAP_CONF_UNKNOWN;
+               if (on->on_bi.bi_cf_ocs) {
+                       ConfigTable *ct;
+                       ca.bi = &on->on_bi;
+                       ct = config_find_keyword( on->on_bi.bi_cf_ocs->co_table, &ca );
+                       if ( ct ) {
+                               rc = config_add_vals( ct, &ca );
+                               if ( rc != SLAP_CONF_UNKNOWN )
+                                       break;
+                       }
+               }
+               if (on->on_bi.bi_db_config && rc == SLAP_CONF_UNKNOWN) {
                        be->bd_info = &on->on_bi;
                        rc = on->on_bi.bi_db_config( be, fname, lineno,
                                argc, argv );
@@ -132,6 +160,8 @@ over_db_config(
                }
        }
        be->bd_info = bi_orig;
+       be->be_cf_ocs = be_cf_ocs;
+       
        return rc;
 }
 
@@ -209,46 +239,6 @@ over_back_response ( Operation *op, SlapReply *rs )
        return rc;
 }
 
-enum op_which {
-       op_bind = 0,
-       op_unbind,
-       op_search,
-       op_compare,
-       op_modify,
-       op_modrdn,
-       op_add,
-       op_delete,
-       op_abandon,
-       op_cancel,
-       op_extended,
-       op_aux_operational,
-       op_aux_chk_referrals,
-       op_aux_chk_controls,
-       op_last
-};
-
-/*
- * default return code in case of missing backend function
- * and overlay stack returning SLAP_CB_CONTINUE
- */
-static int op_rc[] = {
-       LDAP_UNWILLING_TO_PERFORM,      /* bind */
-       LDAP_UNWILLING_TO_PERFORM,      /* unbind */
-       LDAP_UNWILLING_TO_PERFORM,      /* search */
-       SLAP_CB_CONTINUE,               /* compare; pass to frontend */
-       LDAP_UNWILLING_TO_PERFORM,      /* modify */
-       LDAP_UNWILLING_TO_PERFORM,      /* modrdn */
-       LDAP_UNWILLING_TO_PERFORM,      /* add */
-       LDAP_UNWILLING_TO_PERFORM,      /* delete */
-       LDAP_UNWILLING_TO_PERFORM,      /* abandon */
-       LDAP_UNWILLING_TO_PERFORM,      /* cancel */
-       LDAP_UNWILLING_TO_PERFORM,      /* extended */
-       LDAP_SUCCESS,                   /* aux_operational */
-       LDAP_SUCCESS,                   /* aux_chk_referrals */
-       SLAP_CB_CONTINUE                /* aux_chk_controls; pass to frontend */
-};
-
-#ifdef SLAP_OVERLAY_ACCESS
 static int
 over_access_allowed(
        Operation               *op,
@@ -261,6 +251,7 @@ over_access_allowed(
 {
        slap_overinfo *oi;
        slap_overinst *on;
+       BackendInfo *bi;
        BackendDB *be = op->o_bd, db;
        int rc = SLAP_CB_CONTINUE;
 
@@ -268,11 +259,18 @@ over_access_allowed(
         * when global overlays are used... */
        assert( op->o_bd != NULL );
 
-       oi = op->o_bd->bd_info->bi_private;
+       bi = op->o_bd->bd_info;
+       /* Were we invoked on the frontend? */
+       if ( !bi->bi_access_allowed ) {
+               oi = frontendDB->bd_info->bi_private;
+       } else {
+               oi = op->o_bd->bd_info->bi_private;
+       }
        on = oi->oi_list;
 
        for ( ; on; on = on->on_next ) {
                if ( on->on_bi.bi_access_allowed ) {
+                       /* NOTE: do not copy the structure until required */
                        if ( !SLAP_ISOVERLAY( op->o_bd ) ) {
                                db = *op->o_bd;
                                db.be_flags |= SLAP_DBFLAG_OVERLAY;
@@ -286,15 +284,22 @@ over_access_allowed(
                }
        }
 
-       if ( rc == SLAP_CB_CONTINUE && oi->oi_orig->bi_access_allowed ) {
-               if ( !SLAP_ISOVERLAY( op->o_bd ) ) {
-                       db = *op->o_bd;
-                       db.be_flags |= SLAP_DBFLAG_OVERLAY;
-                       op->o_bd = &db;
+       if ( rc == SLAP_CB_CONTINUE ) {
+               BI_access_allowed       *bi_access_allowed;
+
+               /* if the database structure was changed, o_bd points to a
+                * copy of the structure; put the original bd_info in place */
+               if ( SLAP_ISOVERLAY( op->o_bd ) ) {
+                       op->o_bd->bd_info = oi->oi_orig;
                }
 
-               op->o_bd->bd_info = oi->oi_orig;
-               rc = oi->oi_orig->bi_access_allowed( op, e,
+               if ( oi->oi_orig->bi_access_allowed ) {
+                       bi_access_allowed = oi->oi_orig->bi_access_allowed;
+               } else {
+                       bi_access_allowed = slap_access_allowed;
+               }
+
+               rc = bi_access_allowed( op, e,
                        desc, val, access, state, maskp );
        }
        /* should not fall thru this far without anything happening... */
@@ -304,22 +309,24 @@ over_access_allowed(
        }
 
        op->o_bd = be;
+       op->o_bd->bd_info = bi;
+
        return rc;
 }
-#endif /* SLAP_OVERLAY_ACCESS */
 
 static int
-over_op_func(
-       Operation *op,
-       SlapReply *rs,
-       enum op_which which
-)
+over_acl_group(
+       Operation               *op,
+       Entry                   *e,
+       struct berval           *gr_ndn,
+       struct berval           *op_ndn,
+       ObjectClass             *group_oc,
+       AttributeDescription    *group_at )
 {
        slap_overinfo *oi;
        slap_overinst *on;
-       BI_op_bind **func;
+       BackendInfo *bi = op->o_bd->bd_info;
        BackendDB *be = op->o_bd, db;
-       slap_callback cb = {NULL, over_back_response, NULL, NULL};
        int rc = SLAP_CB_CONTINUE;
 
        /* FIXME: used to happen for instance during abandon
@@ -329,14 +336,151 @@ over_op_func(
        oi = op->o_bd->bd_info->bi_private;
        on = oi->oi_list;
 
-       if ( !SLAP_ISOVERLAY( op->o_bd )) {
-               db = *op->o_bd;
-               db.be_flags |= SLAP_DBFLAG_OVERLAY;
-               op->o_bd = &db;
+       for ( ; on; on = on->on_next ) {
+               if ( on->on_bi.bi_acl_group ) {
+                       /* NOTE: do not copy the structure until required */
+                       if ( !SLAP_ISOVERLAY( op->o_bd ) ) {
+                               db = *op->o_bd;
+                               db.be_flags |= SLAP_DBFLAG_OVERLAY;
+                               op->o_bd = &db;
+                       }
+
+                       op->o_bd->bd_info = (BackendInfo *)on;
+                       rc = on->on_bi.bi_acl_group( op, e,
+                               gr_ndn, op_ndn, group_oc, group_at );
+                       if ( rc != SLAP_CB_CONTINUE ) break;
+               }
        }
-       cb.sc_next = op->o_callback;
-       cb.sc_private = oi;
-       op->o_callback = &cb;
+
+       if ( rc == SLAP_CB_CONTINUE ) {
+               BI_acl_group            *bi_acl_group;
+
+               /* if the database structure was changed, o_bd points to a
+                * copy of the structure; put the original bd_info in place */
+               if ( SLAP_ISOVERLAY( op->o_bd ) ) {
+                       op->o_bd->bd_info = oi->oi_orig;
+               }
+
+               if ( oi->oi_orig->bi_acl_group ) {
+                       bi_acl_group = oi->oi_orig->bi_acl_group;
+               } else {
+                       bi_acl_group = backend_group;
+               }
+
+               rc = bi_acl_group( op, e,
+                       gr_ndn, op_ndn, group_oc, group_at );
+       }
+       /* should not fall thru this far without anything happening... */
+       if ( rc == SLAP_CB_CONTINUE ) {
+               /* access not allowed */
+               rc = 0;
+       }
+
+       op->o_bd = be;
+       op->o_bd->bd_info = bi;
+
+       return rc;
+}
+
+static int
+over_acl_attribute(
+       Operation               *op,
+       Entry                   *target,
+       struct berval           *entry_ndn,
+       AttributeDescription    *entry_at,
+       BerVarray               *vals,
+       slap_access_t           access )
+{
+       slap_overinfo *oi;
+       slap_overinst *on;
+       BackendInfo *bi = op->o_bd->bd_info;
+       BackendDB *be = op->o_bd, db;
+       int rc = SLAP_CB_CONTINUE;
+
+       /* FIXME: used to happen for instance during abandon
+        * when global overlays are used... */
+       assert( op->o_bd != NULL );
+
+       oi = op->o_bd->bd_info->bi_private;
+       on = oi->oi_list;
+
+       for ( ; on; on = on->on_next ) {
+               if ( on->on_bi.bi_acl_attribute ) {
+                       /* NOTE: do not copy the structure until required */
+                       if ( !SLAP_ISOVERLAY( op->o_bd ) ) {
+                               db = *op->o_bd;
+                               db.be_flags |= SLAP_DBFLAG_OVERLAY;
+                               op->o_bd = &db;
+                       }
+
+                       op->o_bd->bd_info = (BackendInfo *)on;
+                       rc = on->on_bi.bi_acl_attribute( op, target,
+                               entry_ndn, entry_at, vals, access );
+                       if ( rc != SLAP_CB_CONTINUE ) break;
+               }
+       }
+
+       if ( rc == SLAP_CB_CONTINUE ) {
+               BI_acl_attribute                *bi_acl_attribute;
+
+               /* if the database structure was changed, o_bd points to a
+                * copy of the structure; put the original bd_info in place */
+               if ( SLAP_ISOVERLAY( op->o_bd ) ) {
+                       op->o_bd->bd_info = oi->oi_orig;
+               }
+
+               if ( oi->oi_orig->bi_acl_attribute ) {
+                       bi_acl_attribute = oi->oi_orig->bi_acl_attribute;
+               } else {
+                       bi_acl_attribute = backend_attribute;
+               }
+
+               rc = bi_acl_attribute( op, target,
+                       entry_ndn, entry_at, vals, access );
+       }
+       /* should not fall thru this far without anything happening... */
+       if ( rc == SLAP_CB_CONTINUE ) {
+               /* access not allowed */
+               rc = 0;
+       }
+
+       op->o_bd = be;
+       op->o_bd->bd_info = bi;
+
+       return rc;
+}
+
+/*
+ * default return code in case of missing backend function
+ * and overlay stack returning SLAP_CB_CONTINUE
+ */
+static int op_rc[ op_last ] = {
+       LDAP_UNWILLING_TO_PERFORM,      /* bind */
+       LDAP_UNWILLING_TO_PERFORM,      /* unbind */
+       LDAP_UNWILLING_TO_PERFORM,      /* search */
+       SLAP_CB_CONTINUE,               /* compare; pass to frontend */
+       LDAP_UNWILLING_TO_PERFORM,      /* modify */
+       LDAP_UNWILLING_TO_PERFORM,      /* modrdn */
+       LDAP_UNWILLING_TO_PERFORM,      /* add */
+       LDAP_UNWILLING_TO_PERFORM,      /* delete */
+       LDAP_UNWILLING_TO_PERFORM,      /* abandon */
+       LDAP_UNWILLING_TO_PERFORM,      /* cancel */
+       LDAP_UNWILLING_TO_PERFORM,      /* extended */
+       LDAP_SUCCESS,                   /* aux_operational */
+       LDAP_SUCCESS,                   /* aux_chk_referrals */
+       SLAP_CB_CONTINUE                /* aux_chk_controls; pass to frontend */
+};
+
+int overlay_op_walk(
+       Operation *op,
+       SlapReply *rs,
+       slap_operation_t which,
+       slap_overinfo *oi,
+       slap_overinst *on
+)
+{
+       BI_op_bind **func;
+       int rc = SLAP_CB_CONTINUE;
 
        for (; on; on=on->on_next ) {
                func = &on->on_bi.bi_op_bind;
@@ -362,14 +506,48 @@ over_op_func(
         */
        if ( rc == LDAP_UNWILLING_TO_PERFORM ) {
                slap_callback *sc_next;
-               for ( ; op->o_callback && op->o_callback != cb.sc_next; 
-                       op->o_callback = sc_next ) {
+               for ( ; op->o_callback && op->o_callback->sc_response !=
+                       over_back_response; op->o_callback = sc_next ) {
                        sc_next = op->o_callback->sc_next;
                        if ( op->o_callback->sc_cleanup ) {
                                op->o_callback->sc_cleanup( op, rs );
                        }
                }
        }
+       return rc;
+}
+
+static int
+over_op_func(
+       Operation *op,
+       SlapReply *rs,
+       slap_operation_t which
+)
+{
+       slap_overinfo *oi;
+       slap_overinst *on;
+       BackendDB *be = op->o_bd, db;
+       slap_callback cb = {NULL, over_back_response, NULL, NULL};
+       int rc = SLAP_CB_CONTINUE;
+
+       /* FIXME: used to happen for instance during abandon
+        * when global overlays are used... */
+       assert( op->o_bd != NULL );
+
+       oi = op->o_bd->bd_info->bi_private;
+       on = oi->oi_list;
+
+       if ( !SLAP_ISOVERLAY( op->o_bd )) {
+               db = *op->o_bd;
+               db.be_flags |= SLAP_DBFLAG_OVERLAY;
+               op->o_bd = &db;
+       }
+       cb.sc_next = op->o_callback;
+       cb.sc_private = oi;
+       op->o_callback = &cb;
+
+       rc = overlay_op_walk( op, rs, which, oi, on );
+
        op->o_bd = be;
        op->o_callback = cb.sc_next;
        return rc;
@@ -459,16 +637,24 @@ over_aux_chk_controls( Operation *op, SlapReply *rs )
        return over_op_func( op, rs, op_aux_chk_controls );
 }
 
+enum conn_which {
+       conn_init = 0,
+       conn_destroy,
+       conn_last
+};
+
 static int
-over_connection_destroy(
+over_connection_func(
        BackendDB       *bd,
-       Connection      *conn
+       Connection      *conn,
+       enum conn_which which
 )
 {
-       slap_overinfo *oi;
-       slap_overinst *on;
-       BackendDB db;
-       int rc = SLAP_CB_CONTINUE;
+       slap_overinfo           *oi;
+       slap_overinst           *on;
+       BackendDB               db;
+       int                     rc = SLAP_CB_CONTINUE;
+       BI_connection_init      **func;
 
        /* FIXME: used to happen for instance during abandon
         * when global overlays are used... */
@@ -477,23 +663,25 @@ over_connection_destroy(
        oi = bd->bd_info->bi_private;
        on = oi->oi_list;
 
-       if ( !SLAP_ISOVERLAY( bd )) {
+       if ( !SLAP_ISOVERLAY( bd ) ) {
                db = *bd;
                db.be_flags |= SLAP_DBFLAG_OVERLAY;
                bd = &db;
        }
 
-       for (; on; on=on->on_next ) {
-               if ( on->on_bi.bi_connection_destroy ) {
+       for ( ; on; on = on->on_next ) {
+               func = &on->on_bi.bi_connection_init;
+               if ( func[ which ] ) {
                        bd->bd_info = (BackendInfo *)on;
-                       rc = on->on_bi.bi_connection_destroy( bd, conn );
+                       rc = func[ which ]( bd, conn );
                        if ( rc != SLAP_CB_CONTINUE ) break;
                }
        }
 
-       if ( oi->oi_orig->bi_connection_destroy && rc == SLAP_CB_CONTINUE ) {
+       func = &oi->oi_orig->bi_connection_init;
+       if ( func[ which ] && rc == SLAP_CB_CONTINUE ) {
                bd->bd_info = oi->oi_orig;
-               rc = oi->oi_orig->bi_connection_destroy( bd, conn );
+               rc = func[ which ]( bd, conn );
        }
        /* should not fall thru this far without anything happening... */
        if ( rc == SLAP_CB_CONTINUE ) {
@@ -503,11 +691,92 @@ over_connection_destroy(
        return rc;
 }
 
+static int
+over_connection_init(
+       BackendDB       *bd,
+       Connection      *conn
+)
+{
+       return over_connection_func( bd, conn, conn_init );
+}
+
+static int
+over_connection_destroy(
+       BackendDB       *bd,
+       Connection      *conn
+)
+{
+       return over_connection_func( bd, conn, conn_destroy );
+}
+
 int
 overlay_register(
        slap_overinst *on
 )
 {
+       slap_overinst   *tmp;
+
+       /* FIXME: check for duplicates? */
+       for ( tmp = overlays; tmp != NULL; tmp = tmp->on_next ) {
+               if ( strcmp( on->on_bi.bi_type, tmp->on_bi.bi_type ) == 0 ) {
+                       Debug( LDAP_DEBUG_ANY,
+                               "overlay_register(\"%s\"): "
+                               "name already in use.\n",
+                               on->on_bi.bi_type, 0, 0 );
+                       return -1;
+               }
+
+               if ( on->on_bi.bi_obsolete_names != NULL ) {
+                       int     i;
+
+                       for ( i = 0; on->on_bi.bi_obsolete_names[ i ] != NULL; i++ ) {
+                               if ( strcmp( on->on_bi.bi_obsolete_names[ i ], tmp->on_bi.bi_type ) == 0 ) {
+                                       Debug( LDAP_DEBUG_ANY,
+                                               "overlay_register(\"%s\"): "
+                                               "obsolete name \"%s\" already in use "
+                                               "by overlay \"%s\".\n",
+                                               on->on_bi.bi_type,
+                                               on->on_bi.bi_obsolete_names[ i ],
+                                               tmp->on_bi.bi_type );
+                                       return -1;
+                               }
+                       }
+               }
+
+               if ( tmp->on_bi.bi_obsolete_names != NULL ) {
+                       int     i;
+
+                       for ( i = 0; tmp->on_bi.bi_obsolete_names[ i ] != NULL; i++ ) {
+                               int     j;
+
+                               if ( strcmp( on->on_bi.bi_type, tmp->on_bi.bi_obsolete_names[ i ] ) == 0 ) {
+                                       Debug( LDAP_DEBUG_ANY,
+                                               "overlay_register(\"%s\"): "
+                                               "name already in use "
+                                               "as obsolete by overlay \"%s\".\n",
+                                               on->on_bi.bi_type,
+                                               tmp->on_bi.bi_obsolete_names[ i ], 0 );
+                                       return -1;
+                               }
+
+                               if ( on->on_bi.bi_obsolete_names != NULL ) {
+                                       for ( j = 0; on->on_bi.bi_obsolete_names[ j ] != NULL; j++ ) {
+                                               if ( strcmp( on->on_bi.bi_obsolete_names[ j ], tmp->on_bi.bi_obsolete_names[ i ] ) == 0 ) {
+                                                       Debug( LDAP_DEBUG_ANY,
+                                                               "overlay_register(\"%s\"): "
+                                                               "obsolete name \"%s\" already in use "
+                                                               "as obsolete by overlay \"%s\".\n",
+                                                               on->on_bi.bi_type,
+                                                               on->on_bi.bi_obsolete_names[ j ],
+                                                               tmp->on_bi.bi_type );
+                                                       return -1;
+                                               }
+                                       }
+                               }
+                       }
+               }
+       }
+
        on->on_next = overlays;
        overlays = on;
        return 0;
@@ -515,8 +784,8 @@ overlay_register(
 
 /*
  * iterator on registered overlays; overlay_next( NULL ) returns the first
- * overlay; subsequent calls with the previously returned value allow to 
- * iterate over the entire list; returns NULL when no more overlays are 
+ * overlay; subsequent calls with the previously returned value allow to 
+ * iterate over the entire list; returns NULL when no more overlays are 
  * registered.
  */
 
@@ -542,14 +811,30 @@ overlay_find( const char *over_type )
 {
        slap_overinst *on = overlays;
 
-       assert( over_type );
+       assert( over_type != NULL );
 
        for ( ; on; on = on->on_next ) {
                if ( strcmp( on->on_bi.bi_type, over_type ) == 0 ) {
-                       break;
+                       goto foundit;
+               }
+
+               if ( on->on_bi.bi_obsolete_names != NULL ) {
+                       int     i;
+
+                       for ( i = 0; on->on_bi.bi_obsolete_names[ i ] != NULL; i++ ) {
+                               if ( strcmp( on->on_bi.bi_obsolete_names[ i ], over_type ) == 0 ) {
+                                       Debug( LDAP_DEBUG_ANY,
+                                               "overlay_find(\"%s\"): "
+                                               "obsolete name for \"%s\".\n",
+                                               on->on_bi.bi_obsolete_names[ i ],
+                                               on->on_bi.bi_type, 0 );
+                                       goto foundit;
+                               }
+                       }
                }
        }
 
+foundit:;
        return on;
 }
 
@@ -577,7 +862,7 @@ overlay_is_inst( BackendDB *be, const char *over_type )
 {
        slap_overinst   *on;
 
-       assert( be );
+       assert( be != NULL );
 
        if ( !overlay_is_over( be ) ) {
                return 0;
@@ -596,7 +881,6 @@ overlay_is_inst( BackendDB *be, const char *over_type )
 int
 overlay_register_control( BackendDB *be, const char *oid )
 {
-       int             rc = 0;
        int             gotit = 0;
        int             cid;
 
@@ -604,7 +888,7 @@ overlay_register_control( BackendDB *be, const char *oid )
                return -1;
        }
 
-       if ( SLAP_DBFLAGS( be ) & SLAP_DBFLAG_GLOBAL_OVERLAY ) {
+       if ( SLAP_ISGLOBALOVERLAY( be ) ) {
                BackendDB *bd;
                
                /* add to all backends... */
@@ -619,12 +903,33 @@ overlay_register_control( BackendDB *be, const char *oid )
 
        }
        
-       if ( rc == 0 && !gotit ) {
+       if ( !gotit ) {
                be->be_ctrls[ cid ] = 1;
                be->be_ctrls[ SLAP_MAX_CIDS ] = 1;
        }
 
-       return rc;
+       return 0;
+}
+
+void
+overlay_destroy_one( BackendDB *be, slap_overinst *on )
+{
+       slap_overinfo *oi = on->on_info;
+       slap_overinst **oidx;
+
+       for ( oidx = &oi->oi_list; *oidx; oidx = &(*oidx)->on_next ) {
+               if ( *oidx == on ) {
+                       *oidx = on->on_next;
+                       if ( on->on_bi.bi_db_destroy ) {
+                               BackendInfo *bi_orig = be->bd_info;
+                               be->bd_info = (BackendInfo *)on;
+                               on->on_bi.bi_db_destroy( be );
+                               be->bd_info = bi_orig;
+                       }
+                       free( on );
+                       break;
+               }
+       }
 }
 
 /* add an overlay to a particular backend. */
@@ -645,14 +950,33 @@ overlay_config( BackendDB *be, const char *ov )
         * overlay info structure
         */
        if ( !overlay_is_over( be ) ) {
-               oi = ch_malloc( sizeof( slap_overinfo ) );
-               oi->oi_orig = be->bd_info;
-               oi->oi_bi = *be->bd_info;
+               int     isglobal = 0;
 
                /* NOTE: the first time a global overlay is configured,
                 * frontendDB gets this flag; it is used later by overlays
                 * to determine if they're stacked on top of the frontendDB */
-               if ( oi->oi_orig == frontendDB->bd_info ) {
+               if ( be->bd_info == frontendDB->bd_info || SLAP_ISGLOBALOVERLAY( be ) ) {
+                       isglobal = 1;
+                       if ( on->on_bi.bi_flags & SLAPO_BFLAG_DBONLY ) {
+                               Debug( LDAP_DEBUG_ANY, "overlay_config(): "
+                                       "overlay \"%s\" cannot be global.\n",
+                                       ov, 0, 0 );
+                               return 1;
+                       }
+
+               } else if ( on->on_bi.bi_flags & SLAPO_BFLAG_GLOBONLY ) {
+                       Debug( LDAP_DEBUG_ANY, "overlay_config(): "
+                               "overlay \"%s\" can only be global.\n",
+                               ov, 0, 0 );
+                       return 1;
+               }
+
+               oi = ch_malloc( sizeof( slap_overinfo ) );
+               oi->oi_orig = be->bd_info;
+               oi->oi_bi = *be->bd_info;
+               oi->oi_origdb = be;
+
+               if ( isglobal ) {
                        SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLOBAL_OVERLAY;
                }
 
@@ -692,11 +1016,12 @@ overlay_config( BackendDB *be, const char *ov )
                bi->bi_chk_referrals = over_aux_chk_referrals;
                bi->bi_chk_controls = over_aux_chk_controls;
 
-#ifdef SLAP_OVERLAY_ACCESS
-               /* this has a specific arglist */
+               /* these have specific arglists */
                bi->bi_access_allowed = over_access_allowed;
-#endif /* SLAP_OVERLAY_ACCESS */
+               bi->bi_acl_group = over_acl_group;
+               bi->bi_acl_attribute = over_acl_attribute;
                
+               bi->bi_connection_init = over_connection_init;
                bi->bi_connection_destroy = over_connection_destroy;
 
                be->bd_info = bi;
@@ -704,8 +1029,11 @@ overlay_config( BackendDB *be, const char *ov )
        } else {
                if ( overlay_is_inst( be, ov ) ) {
                        Debug( LDAP_DEBUG_ANY, "overlay_config(): "
-                                       "warning, overlay \"%s\" "
-                                       "already in list\n", ov, 0, 0 );
+                               "overlay \"%s\" already in list\n",
+                               ov, 0, 0 );
+                       if ( SLAPO_SINGLE( be ) ) {
+                               return 1;
+                       }
                }
 
                oi = be->bd_info->bi_private;