X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=servers%2Fslapd%2Fbackover.c;h=bd95b393610b1a3cc9a67a62efc60c1980a61c90;hb=3cdba151ad18dba10786fde4464442ddaf67b5fe;hp=0aa4a72be93ca3e193060cc214b0a7282ac5d2fa;hpb=fed3c18e889eddf1a176c2105f06d926de07fea9;p=openldap

diff --git a/servers/slapd/backover.c b/servers/slapd/backover.c
index 0aa4a72be9..bd95b39361 100644
--- a/servers/slapd/backover.c
+++ b/servers/slapd/backover.c
@@ -2,7 +2,7 @@
 /* $OpenLDAP$ */
 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
  *
- * Copyright 2003-2005 The OpenLDAP Foundation.
+ * Copyright 2003-2007 The OpenLDAP Foundation.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -210,10 +210,13 @@ over_db_destroy(
 
 	rc = over_db_func( be, db_destroy );
 
-	for (next = on->on_next; on; on=next) {
-		next = on->on_next;
-		free( on );
+	if ( on ) {
+		for (next = on->on_next; on; on=next) {
+			next = on->on_next;
+			free( on );
+		}
 	}
+
 	free( oi );
 	return rc;
 }
@@ -235,11 +238,15 @@ over_back_response ( Operation *op, SlapReply *rs )
 			if ( rc != SLAP_CB_CONTINUE ) break;
 		}
 	}
+	/* Bypass the remaining on_response layers, but allow
+	 * normal execution to continue.
+	 */
+	if ( rc == SLAP_CB_BYPASS )
+		rc = SLAP_CB_CONTINUE;
 	op->o_bd = be;
 	return rc;
 }
 
-#ifdef SLAP_OVERLAY_ACCESS
 static int
 over_access_allowed(
 	Operation		*op,
@@ -450,7 +457,6 @@ over_acl_attribute(
 
 	return rc;
 }
-#endif /* SLAP_OVERLAY_ACCESS */
 
 /*
  * default return code in case of missing backend function
@@ -492,6 +498,8 @@ int overlay_op_walk(
 			if ( rc != SLAP_CB_CONTINUE ) break;
 		}
 	}
+	if ( rc == SLAP_CB_BYPASS )
+		rc = SLAP_CB_CONTINUE;
 
 	func = &oi->oi_orig->bi_op_bind;
 	if ( func[which] && rc == SLAP_CB_CONTINUE ) {
@@ -890,7 +898,7 @@ 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... */
@@ -934,14 +942,77 @@ overlay_destroy_one( BackendDB *be, slap_overinst *on )
 	}
 }
 
+void
+overlay_insert( BackendDB *be, slap_overinst *on2, slap_overinst ***prev,
+	int idx )
+{
+	slap_overinfo *oi = (slap_overinfo *)be->bd_info;
+
+	if ( idx == -1 ) {
+		on2->on_next = oi->oi_list;
+		oi->oi_list = on2;
+	} else {
+		int i;
+		slap_overinst *on, *otmp1 = NULL, *otmp2;
+
+		/* Since the list is in reverse order and is singly linked,
+		 * we reverse it to find the idx insertion point. Adding
+		 * on overlay at a specific point should be a pretty
+		 * infrequent occurrence.
+		 */
+		for ( on = oi->oi_list; on; on=otmp2 ) {
+			otmp2 = on->on_next;
+			on->on_next = otmp1;
+			otmp1 = on;
+		}
+		oi->oi_list = NULL;
+		/* advance to insertion point */
+		for ( i=0, on = otmp1; i<idx; i++ ) {
+			otmp1 = on->on_next;
+			on->on_next = oi->oi_list;
+			oi->oi_list = on;
+		}
+		/* insert */
+		on2->on_next = oi->oi_list;
+		oi->oi_list = on2;
+		if ( otmp1 ) {
+			*prev = &otmp1->on_next;
+			/* replace remainder of list */
+			for ( on=otmp1; on; on=otmp1 ) {
+				otmp1 = on->on_next;
+				on->on_next = oi->oi_list;
+				oi->oi_list = on;
+			}
+		}
+	}
+}
+
+void
+overlay_move( BackendDB *be, slap_overinst *on, int idx )
+{
+	slap_overinfo *oi = (slap_overinfo *)be->bd_info;
+	slap_overinst **onp;
+
+	for (onp = &oi->oi_list; *onp; onp= &(*onp)->on_next) {
+		if ( *onp == on ) {
+			*onp = on->on_next;
+			break;
+		}
+	}
+	overlay_insert( be, on, &onp, idx );
+}
+
 /* add an overlay to a particular backend. */
 int
-overlay_config( BackendDB *be, const char *ov )
+overlay_config( BackendDB *be, const char *ov, int idx, BackendInfo **res )
 {
-	slap_overinst *on = NULL, *on2 = NULL;
+	slap_overinst *on = NULL, *on2 = NULL, **prev;
 	slap_overinfo *oi = NULL;
 	BackendInfo *bi = NULL;
 
+	if ( res )
+		*res = NULL;
+
 	on = overlay_find( ov );
 	if ( !on ) {
 		Debug( LDAP_DEBUG_ANY, "overlay \"%s\" not found\n", ov, 0, 0 );
@@ -952,15 +1023,33 @@ overlay_config( BackendDB *be, const char *ov )
 	 * overlay info structure
 	 */
 	if ( !overlay_is_over( be ) ) {
+		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 ( 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;
 
-		/* 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 ( isglobal ) {
 			SLAP_DBFLAGS( be ) |= SLAP_DBFLAG_GLOBAL_OVERLAY;
 		}
 
@@ -1000,12 +1089,10 @@ 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
 		/* these have specific arglists */
 		bi->bi_access_allowed = over_access_allowed;
 		bi->bi_acl_group = over_acl_group;
 		bi->bi_acl_attribute = over_acl_attribute;
-#endif /* SLAP_OVERLAY_ACCESS */
 		
 		bi->bi_connection_init = over_connection_init;
 		bi->bi_connection_destroy = over_connection_destroy;
@@ -1015,31 +1102,54 @@ 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;
 	}
 
-	/* Insert new overlay on head of list. Overlays are executed
-	 * in reverse of config order...
+	/* Insert new overlay into list. By default overlays are
+	 * added to head of list and executed in LIFO order.
 	 */
 	on2 = ch_calloc( 1, sizeof(slap_overinst) );
 	*on2 = *on;
 	on2->on_info = oi;
-	on2->on_next = oi->oi_list;
-	oi->oi_list = on2;
+
+	prev = &oi->oi_list;
+	/* Do we need to find the insertion point? */
+	if ( idx >= 0 ) {
+		int i;
+
+		/* count current overlays */
+		for ( i=0, on=oi->oi_list; on; on=on->on_next, i++ );
+
+		/* are we just appending a new one? */
+		if ( idx >= i )
+			idx = -1;
+	}
+	overlay_insert( be, on2, &prev, idx );
 
 	/* Any initialization needed? */
-	if ( on->on_bi.bi_db_init ) {
+	if ( on2->on_bi.bi_db_init ) {
 		int rc;
 		be->bd_info = (BackendInfo *)on2;
 		rc = on2->on_bi.bi_db_init( be );
 		be->bd_info = (BackendInfo *)oi;
-		if ( rc ) return rc;
+		if ( rc ) {
+			*prev = on2->on_next;
+			ch_free( on2 );
+			on2 = NULL;
+			return rc;
+		}
 	}
 
+	if ( res )
+		*res = &on2->on_bi;
+
 	return 0;
 }