s4:dsdb/samdb/ldb_modules/schema.c - move "get_last_structural_class()" into "util.c"

[mdw/samba.git] / source4 / dsdb / samdb / ldb_modules / util.c

diff --git a/source4/dsdb/samdb/ldb_modules/util.c b/source4/dsdb/samdb/ldb_modules/util.c
index 4e0001d17bc09e429e98fca5b00cd70037135352..0f1a61236f114fb118f11046834485b2dfc6dcef 100644 (file)
--- a/source4/dsdb/samdb/ldb_modules/util.c
+++ b/source4/dsdb/samdb/ldb_modules/util.c
@@ -1362,3 +1362,33 @@ struct ldb_message_element *dsdb_get_single_valued_attr(const struct ldb_message
 
        return el;
 }
+
+/*
+ * This function determines the (last) structural or 88 object class of a passed
+ * "objectClass" attribute - per MS-ADTS 3.1.1.1.4 this is the last value.
+ * Without schema this does not work and hence NULL is returned.
+ */
+const struct dsdb_class *dsdb_get_last_structural_class(const struct dsdb_schema *schema,
+                                                       const struct ldb_message_element *element)
+{
+       const struct dsdb_class *last_class;
+
+       if (schema == NULL) {
+               return NULL;
+       }
+
+       if (element->num_values == 0) {
+               return NULL;
+       }
+
+       last_class = dsdb_class_by_lDAPDisplayName_ldb_val(schema,
+                                                          &element->values[element->num_values-1]);
+       if (last_class == NULL) {
+               return NULL;
+       }
+       if (last_class->objectClassCategory > 1) {
+               return NULL;
+       }
+
+       return last_class;
+}