dsdb:repl_meta_data: implement DSDB_CONTROL_DBCHECK_FIX_DUPLICATE_LINKS control

This will be used by dbcheck to fix duplicate link values.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13095

Signed-off-by: Stefan Metzmacher <metze@samba.org>

diff --git a/source4/dsdb/samdb/ldb_modules/repl_meta_data.c b/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
index 9a243497be764a48fe7339381ab670767bb30fad..c7aacd83615c5a3d26eda63a68e0dcab38334724 100644 (file)
--- a/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
+++ b/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
@@ -3303,6 +3303,7 @@ static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
        unsigned int functional_level;
        const struct ldb_message_element *guid_el = NULL;
        struct ldb_control *sd_propagation_control;
+       struct ldb_control *fix_links_control = NULL;
        struct replmd_private *replmd_private =
                talloc_get_type(ldb_module_get_private(module), struct replmd_private);
 
@@ -3328,6 +3329,39 @@ static int replmd_modify(struct ldb_module *module, struct ldb_request *req)
 
        ldb = ldb_module_get_ctx(module);
 
+       fix_links_control = ldb_request_get_control(req,
+                                       DSDB_CONTROL_DBCHECK_FIX_DUPLICATE_LINKS);
+       if (fix_links_control != NULL) {
+               struct dsdb_schema *schema = NULL;
+               const struct dsdb_attribute *sa = NULL;
+
+               if (req->op.mod.message->num_elements != 1) {
+                       return ldb_module_operr(module);
+               }
+
+               if (req->op.mod.message->elements[0].flags != LDB_FLAG_MOD_REPLACE) {
+                       return ldb_module_operr(module);
+               }
+
+               schema = dsdb_get_schema(ldb, req);
+               if (schema == NULL) {
+                       return ldb_module_operr(module);
+               }
+
+               sa = dsdb_attribute_by_lDAPDisplayName(schema,
+                               req->op.mod.message->elements[0].name);
+               if (sa == NULL) {
+                       return ldb_module_operr(module);
+               }
+
+               if (sa->linkID == 0) {
+                       return ldb_module_operr(module);
+               }
+
+               fix_links_control->critical = false;
+               return ldb_next_request(module, req);
+       }
+
        ldb_debug(ldb, LDB_DEBUG_TRACE, "replmd_modify\n");
 
        guid_el = ldb_msg_find_element(req->op.mod.message, "objectGUID");