s4-schema: Helper func to compare schemaInfo signitures

diff --git a/source4/dsdb/schema/schema_info_attr.c b/source4/dsdb/schema/schema_info_attr.c
index fb93d91f35cfb291131d06bd9153983e6510aa1a..0b5d50b529e3aaa14f9b2ccc0236083a4a2db63e 100644 (file)
--- a/source4/dsdb/schema/schema_info_attr.c
+++ b/source4/dsdb/schema/schema_info_attr.c
@@ -164,6 +164,47 @@ WERROR dsdb_blob_from_schema_info(const struct dsdb_schema_info *schema_info,
        return WERR_OK;
 }
 
+/**
+ * Compares schemaInfo signatures in dsdb_schema and prefixMap.
+ * NOTE: At present function compares schemaInfo values
+ * as string without taking into account schemVersion field
+ *
+ * @return WERR_OK if schemaInfos are equal
+ *        WERR_DS_DRA_SCHEMA_MISMATCH if schemaInfos are different
+ */
+WERROR dsdb_schema_info_cmp(const struct dsdb_schema *schema,
+                           const struct drsuapi_DsReplicaOIDMapping_Ctr *ctr)
+{
+       bool bres;
+       DATA_BLOB blob;
+       char *schema_info_str;
+       struct drsuapi_DsReplicaOIDMapping *mapping;
+
+       /* we should have at least schemaInfo element */
+       if (ctr->num_mappings < 1) {
+               return WERR_INVALID_PARAMETER;
+       }
+
+       /* verify schemaInfo element is valid */
+       mapping = &ctr->mappings[ctr->num_mappings - 1];
+       if (mapping->id_prefix != 0) {
+               return WERR_INVALID_PARAMETER;
+       }
+
+       blob = data_blob_const(mapping->oid.binary_oid, mapping->oid.length);
+       if (!dsdb_schema_info_blob_is_valid(&blob)) {
+               return WERR_INVALID_PARAMETER;
+       }
+
+       schema_info_str = hex_encode_talloc(NULL, blob.data, blob.length);
+       W_ERROR_HAVE_NO_MEMORY(schema_info_str);
+
+       bres = strequal(schema->schema_info, schema_info_str);
+       talloc_free(schema_info_str);
+
+       return bres ? WERR_OK : WERR_DS_DRA_SCHEMA_MISMATCH;
+}
+
 
 /**
  * Reads schema_info structure from schemaInfo