#include "includes.h"
#include "dsdb/samdb/samdb.h"
-#include "lib/ldb/include/ldb_errors.h"
+#include <ldb_errors.h>
#include "../lib/util/dlinklist.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "libcli/auth/libcli_auth.h"
#include "param/param.h"
-static WERROR dsdb_convert_object_ex(struct ldb_context *ldb,
- const struct dsdb_schema *schema,
- const struct drsuapi_DsReplicaObjectListItemEx *in,
+/**
+ * Multi-pass working schema creation
+ * Function will:
+ * - shallow copy initial schema supplied
+ * - create a working schema in multiple passes
+ * until all objects are resolved
+ * Working schema is a schema with Attributes, Classes
+ * and indexes, but w/o subClassOf, possibleSupperiors etc.
+ * It is to be used just us cache for converting attribute values.
+ */
+WERROR dsdb_repl_make_working_schema(struct ldb_context *ldb,
+ const struct dsdb_schema *initial_schema,
+ const struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr,
+ uint32_t object_count,
+ const struct drsuapi_DsReplicaObjectListItemEx *first_object,
const DATA_BLOB *gensec_skey,
TALLOC_CTX *mem_ctx,
- struct dsdb_extended_replicated_object *out)
+ struct dsdb_schema **_schema_out)
+{
+ struct schema_list {
+ struct schema_list *next, *prev;
+ const struct drsuapi_DsReplicaObjectListItemEx *obj;
+ };
+
+ WERROR werr;
+ struct dsdb_schema_prefixmap *pfm_remote;
+ struct schema_list *schema_list = NULL, *schema_list_item, *schema_list_next_item;
+ struct dsdb_schema *working_schema;
+ const struct drsuapi_DsReplicaObjectListItemEx *cur;
+ int ret, pass_no;
+ uint32_t ignore_attids[] = {
+ DRSUAPI_ATTID_auxiliaryClass,
+ DRSUAPI_ATTID_mayContain,
+ DRSUAPI_ATTID_mustContain,
+ DRSUAPI_ATTID_possSuperiors,
+ DRSUAPI_ATTID_systemPossSuperiors,
+ DRSUAPI_ATTID_INVALID
+ };
+
+ /* make a copy of the iniatial_scheam so we don't mess with it */
+ working_schema = dsdb_schema_copy_shallow(mem_ctx, ldb, initial_schema);
+ if (!working_schema) {
+ DEBUG(0,(__location__ ": schema copy failed!\n"));
+ return WERR_NOMEM;
+ }
+
+ /* we are going to need remote prefixMap for decoding */
+ werr = dsdb_schema_pfm_from_drsuapi_pfm(mapping_ctr, true,
+ mem_ctx, &pfm_remote, NULL);
+ if (!W_ERROR_IS_OK(werr)) {
+ DEBUG(0,(__location__ ": Failed to decode remote prefixMap: %s",
+ win_errstr(werr)));
+ return werr;
+ }
+
+ /* create a list of objects yet to be converted */
+ for (cur = first_object; cur; cur = cur->next_object) {
+ schema_list_item = talloc(mem_ctx, struct schema_list);
+ schema_list_item->obj = cur;
+ DLIST_ADD_END(schema_list, schema_list_item, struct schema_list);
+ }
+
+ /* resolve objects until all are resolved and in local schema */
+ pass_no = 1;
+
+ while (schema_list) {
+ uint32_t converted_obj_count = 0;
+ uint32_t failed_obj_count = 0;
+ TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+ W_ERROR_HAVE_NO_MEMORY(tmp_ctx);
+
+ for (schema_list_item = schema_list; schema_list_item; schema_list_item=schema_list_next_item) {
+ struct dsdb_extended_replicated_object object;
+
+ cur = schema_list_item->obj;
+
+ /* Save the next item, now we have saved out
+ * the current one, so we can DLIST_REMOVE it
+ * safely */
+ schema_list_next_item = schema_list_item->next;
+
+ /*
+ * Convert the objects into LDB messages using the
+ * schema we have so far. It's ok if we fail to convert
+ * an object. We should convert more objects on next pass.
+ */
+ werr = dsdb_convert_object_ex(ldb, working_schema, pfm_remote,
+ cur, gensec_skey,
+ ignore_attids,
+ 0,
+ tmp_ctx, &object);
+ if (!W_ERROR_IS_OK(werr)) {
+ DEBUG(4,("debug: Failed to convert schema object %s into ldb msg, will try during next loop\n",
+ cur->object.identifier->dn));
+
+ failed_obj_count++;
+ } else {
+ /*
+ * Convert the schema from ldb_message format
+ * (OIDs as OID strings) into schema, using
+ * the remote prefixMap
+ */
+ werr = dsdb_schema_set_el_from_ldb_msg(ldb,
+ working_schema,
+ object.msg);
+ if (!W_ERROR_IS_OK(werr)) {
+ DEBUG(4,("debug: failed to convert object %s into a schema element, will try during next loop: %s\n",
+ ldb_dn_get_linearized(object.msg->dn),
+ win_errstr(werr)));
+ failed_obj_count++;
+ } else {
+ DLIST_REMOVE(schema_list, schema_list_item);
+ talloc_free(schema_list_item);
+ converted_obj_count++;
+ }
+ }
+ }
+ talloc_free(tmp_ctx);
+
+ DEBUG(4,("Schema load pass %d: %d/%d of %d objects left to be converted.\n",
+ pass_no, failed_obj_count, converted_obj_count, object_count));
+ pass_no++;
+
+ /* check if we converted any objects in this pass */
+ if (converted_obj_count == 0) {
+ DEBUG(0,("Can't continue Schema load: didn't manage to convert any objects: all %d remaining of %d objects failed to convert\n", failed_obj_count, object_count));
+ return WERR_INTERNAL_ERROR;
+ }
+
+ /* rebuild indexes */
+ ret = dsdb_setup_sorted_accessors(ldb, working_schema);
+ if (LDB_SUCCESS != ret) {
+ DEBUG(0,("Failed to create schema-cache indexes!\n"));
+ return WERR_INTERNAL_ERROR;
+ }
+ };
+
+ *_schema_out = working_schema;
+
+ return WERR_OK;
+}
+
+static bool dsdb_attid_in_list(const uint32_t attid_list[], uint32_t attid)
+{
+ const uint32_t *cur;
+ if (!attid_list) {
+ return false;
+ }
+ for (cur = attid_list; *cur != DRSUAPI_ATTID_INVALID; cur++) {
+ if (*cur == attid) {
+ return true;
+ }
+ }
+ return false;
+}
+
+WERROR dsdb_convert_object_ex(struct ldb_context *ldb,
+ const struct dsdb_schema *schema,
+ const struct dsdb_schema_prefixmap *pfm_remote,
+ const struct drsuapi_DsReplicaObjectListItemEx *in,
+ const DATA_BLOB *gensec_skey,
+ const uint32_t *ignore_attids,
+ uint32_t dsdb_repl_flags,
+ TALLOC_CTX *mem_ctx,
+ struct dsdb_extended_replicated_object *out)
{
NTSTATUS nt_status;
WERROR status;
struct replPropertyMetaData1 *rdn_m = NULL;
struct dom_sid *sid = NULL;
uint32_t rid = 0;
+ uint32_t attr_count;
int ret;
if (!in->object.identifier) {
md->ctr.ctr1.count + 1); /* +1 because of the RDN attribute */
W_ERROR_HAVE_NO_MEMORY(md->ctr.ctr1.array);
- for (i=0; i < in->meta_data_ctr->count; i++) {
+ for (i=0, attr_count=0; i < in->meta_data_ctr->count; i++, attr_count++) {
struct drsuapi_DsReplicaAttribute *a;
struct drsuapi_DsReplicaMetaData *d;
struct replPropertyMetaData1 *m;
struct ldb_message_element *e;
- int j;
+ uint32_t j;
a = &in->object.attribute_ctr.attributes[i];
d = &in->meta_data_ctr->meta_data[i];
- m = &md->ctr.ctr1.array[i];
- e = &msg->elements[i];
+ m = &md->ctr.ctr1.array[attr_count];
+ e = &msg->elements[attr_count];
+
+ if (dsdb_attid_in_list(ignore_attids, a->attid)) {
+ attr_count--;
+ continue;
+ }
for (j=0; j<a->value_ctr.num_values; j++) {
status = drsuapi_decrypt_attribute(a->value_ctr.values[j].blob, gensec_skey, rid, a);
W_ERROR_NOT_OK_RETURN(status);
}
- status = dsdb_attribute_drsuapi_to_ldb(ldb, schema, a, msg->elements, e);
- if (!NT_STATUS_IS_OK(status) && a->value_ctr.num_values == 0) {
- /* w2k8-r2 occasionally sends bogus empty
- attributes with rubbish attribute IDs. The
- only think we can do is discard these */
- DEBUG(0,(__location__ ": Discarding bogus empty DsReplicaAttribute with attid 0x%x\n",
- a->attid));
- ZERO_STRUCTP(e);
- continue;
- }
+ status = dsdb_attribute_drsuapi_to_ldb(ldb, schema, pfm_remote,
+ a, msg->elements, e);
W_ERROR_NOT_OK_RETURN(status);
m->attid = a->attid;
whenChanged = d->originating_change_time;
}
- if (a->attid == DRSUAPI_ATTRIBUTE_name) {
+ if (a->attid == DRSUAPI_ATTID_name) {
name_a = a;
name_d = d;
- rdn_m = &md->ctr.ctr1.array[md->ctr.ctr1.count];
}
}
- /* delete any empty elements */
- for (i=0; i < msg->num_elements; i++) {
- if (msg->elements[i].name == NULL) {
- ldb_msg_remove_element(msg, &msg->elements[i]);
- i--;
- }
+ msg->num_elements = attr_count;
+ md->ctr.ctr1.count = attr_count;
+ if (name_a) {
+ rdn_m = &md->ctr.ctr1.array[md->ctr.ctr1.count];
}
if (rdn_m) {
}
+ if (dsdb_repl_flags & DSDB_REPL_FLAG_PARTIAL_REPLICA) {
+ /* the instanceType type for partial_replica
+ replication is sent via DRS with TYPE_WRITE set, but
+ must be used on the client with TYPE_WRITE removed
+ */
+ int instanceType = ldb_msg_find_attr_as_int(msg, "instanceType", 0);
+ if (instanceType & INSTANCE_TYPE_WRITE) {
+ instanceType &= ~INSTANCE_TYPE_WRITE;
+ ldb_msg_remove_attr(msg, "instanceType");
+ if (ldb_msg_add_fmt(msg, "instanceType", "%d", instanceType) != LDB_SUCCESS) {
+ return WERR_INTERNAL_ERROR;
+ }
+ }
+ }
+
whenChanged_t = nt_time_to_unix(whenChanged);
whenChanged_s = ldb_timestring(msg, whenChanged_t);
W_ERROR_HAVE_NO_MEMORY(whenChanged_s);
return WERR_OK;
}
-WERROR dsdb_extended_replicated_objects_convert(struct ldb_context *ldb,
- const char *partition_dn,
- const struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr,
- uint32_t object_count,
- const struct drsuapi_DsReplicaObjectListItemEx *first_object,
- uint32_t linked_attributes_count,
- const struct drsuapi_DsReplicaLinkedAttribute *linked_attributes,
- const struct repsFromTo1 *source_dsa,
- const struct drsuapi_DsReplicaCursor2CtrEx *uptodateness_vector,
- const DATA_BLOB *gensec_skey,
- TALLOC_CTX *mem_ctx,
- struct dsdb_extended_replicated_objects **objects)
+WERROR dsdb_replicated_objects_convert(struct ldb_context *ldb,
+ const struct dsdb_schema *schema,
+ const char *partition_dn_str,
+ const struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr,
+ uint32_t object_count,
+ const struct drsuapi_DsReplicaObjectListItemEx *first_object,
+ uint32_t linked_attributes_count,
+ const struct drsuapi_DsReplicaLinkedAttribute *linked_attributes,
+ const struct repsFromTo1 *source_dsa,
+ const struct drsuapi_DsReplicaCursor2CtrEx *uptodateness_vector,
+ const DATA_BLOB *gensec_skey,
+ uint32_t dsdb_repl_flags,
+ TALLOC_CTX *mem_ctx,
+ struct dsdb_extended_replicated_objects **objects)
{
WERROR status;
- const struct dsdb_schema *schema;
+ struct ldb_dn *partition_dn;
+ struct dsdb_schema_prefixmap *pfm_remote;
struct dsdb_extended_replicated_objects *out;
const struct drsuapi_DsReplicaObjectListItemEx *cur;
uint32_t i;
- schema = dsdb_get_schema(ldb);
- if (!schema) {
- return WERR_DS_SCHEMA_NOT_LOADED;
- }
-
- status = dsdb_schema_pfm_contains_drsuapi_pfm(schema->prefixmap, mapping_ctr);
- W_ERROR_NOT_OK_RETURN(status);
-
out = talloc_zero(mem_ctx, struct dsdb_extended_replicated_objects);
W_ERROR_HAVE_NO_MEMORY(out);
out->version = DSDB_EXTENDED_REPLICATED_OBJECTS_VERSION;
+ out->dsdb_repl_flags = dsdb_repl_flags;
+
+ /*
+ * Ensure schema is kept valid for as long as 'out'
+ * which may contain pointers to it
+ */
+ schema = talloc_reference(out, schema);
+ W_ERROR_HAVE_NO_MEMORY(schema);
+
+ partition_dn = ldb_dn_new(out, ldb, partition_dn_str);
+ W_ERROR_HAVE_NO_MEMORY_AND_FREE(partition_dn, out);
+
+ status = dsdb_schema_pfm_from_drsuapi_pfm(mapping_ctr, true,
+ out, &pfm_remote, NULL);
+ if (!W_ERROR_IS_OK(status)) {
+ DEBUG(0,(__location__ ": Failed to decode remote prefixMap: %s",
+ win_errstr(status)));
+ talloc_free(out);
+ return status;
+ }
+
+ if (ldb_dn_compare(partition_dn, ldb_get_schema_basedn(ldb)) != 0) {
+ /*
+ * check for schema changes in case
+ * we are not replicating Schema NC
+ */
+ status = dsdb_schema_info_cmp(schema, mapping_ctr);
+ if (!W_ERROR_IS_OK(status)) {
+ DEBUG(1,("Remote schema has changed while replicating %s\n",
+ partition_dn_str));
+ talloc_free(out);
+ return status;
+ }
+ }
- out->partition_dn = ldb_dn_new(out, ldb, partition_dn);
- W_ERROR_HAVE_NO_MEMORY(out->partition_dn);
+ out->partition_dn = partition_dn;
out->source_dsa = source_dsa;
out->uptodateness_vector= uptodateness_vector;
out->objects = talloc_array(out,
struct dsdb_extended_replicated_object,
out->num_objects);
- W_ERROR_HAVE_NO_MEMORY(out->objects);
+ W_ERROR_HAVE_NO_MEMORY_AND_FREE(out->objects, out);
/* pass the linked attributes down to the repl_meta_data
module */
for (i=0, cur = first_object; cur; cur = cur->next_object, i++) {
if (i == out->num_objects) {
+ talloc_free(out);
return WERR_FOOBAR;
}
- status = dsdb_convert_object_ex(ldb, schema,
+ status = dsdb_convert_object_ex(ldb, schema, pfm_remote,
cur, gensec_skey,
+ NULL,
+ dsdb_repl_flags,
out->objects, &out->objects[i]);
if (!W_ERROR_IS_OK(status)) {
- DEBUG(0,("Failed to convert object %s\n", cur->object.identifier->dn));
+ talloc_free(out);
+ DEBUG(0,("Failed to convert object %s: %s\n",
+ cur->object.identifier->dn,
+ win_errstr(status)));
return status;
}
}
if (i != out->num_objects) {
+ talloc_free(out);
return WERR_FOOBAR;
}
+ /* free pfm_remote, we won't need it anymore */
+ talloc_free(pfm_remote);
+
*objects = out;
return WERR_OK;
}
-WERROR dsdb_extended_replicated_objects_commit(struct ldb_context *ldb,
- struct dsdb_extended_replicated_objects *objects,
- uint64_t *notify_uSN)
+/**
+ * Commits a list of replicated objects.
+ *
+ * @param working_schema dsdb_schema to be used for resolving
+ * Classes/Attributes during Schema replication. If not NULL,
+ * it will be set on ldb and used while committing replicated objects
+ */
+WERROR dsdb_replicated_objects_commit(struct ldb_context *ldb,
+ struct dsdb_schema *working_schema,
+ struct dsdb_extended_replicated_objects *objects,
+ uint64_t *notify_uSN)
{
+ WERROR werr;
struct ldb_result *ext_res;
+ struct dsdb_schema *cur_schema = NULL;
int ret;
uint64_t seq_num1, seq_num2;
return WERR_FOOBAR;
}
- ret = dsdb_load_partition_usn(ldb, objects->partition_dn, &seq_num1);
+ ret = dsdb_load_partition_usn(ldb, objects->partition_dn, &seq_num1, NULL);
if (ret != LDB_SUCCESS) {
DEBUG(0,(__location__ " Failed to load partition uSN\n"));
ldb_transaction_cancel(ldb);
return WERR_FOOBAR;
}
+ /*
+ * Set working_schema for ldb in case we are replicating from Schema NC.
+ * Schema won't be reloaded during Replicated Objects commit, as it is
+ * done in a transaction. So we need some way to search for newly
+ * added Classes and Attributes
+ */
+ if (working_schema) {
+ /* store current schema so we can fall back in case of failure */
+ cur_schema = dsdb_get_schema(ldb, working_schema);
+
+ ret = dsdb_reference_schema(ldb, working_schema, false);
+ if (ret != LDB_SUCCESS) {
+ DEBUG(0,(__location__ "Failed to reference working schema - %s\n",
+ ldb_strerror(ret)));
+ /* TODO: Map LDB Error to NTSTATUS? */
+ ldb_transaction_cancel(ldb);
+ return WERR_INTERNAL_ERROR;
+ }
+ }
+
ret = ldb_extended(ldb, DSDB_EXTENDED_REPLICATED_OBJECTS_OID, objects, &ext_res);
if (ret != LDB_SUCCESS) {
+ /* restore previous schema */
+ if (cur_schema ) {
+ dsdb_reference_schema(ldb, cur_schema, false);
+ dsdb_make_schema_global(ldb, cur_schema);
+ }
+
DEBUG(0,("Failed to apply records: %s: %s\n",
ldb_errstring(ldb), ldb_strerror(ret)));
ldb_transaction_cancel(ldb);
}
talloc_free(ext_res);
+ /* Save our updated prefixMap */
+ if (working_schema) {
+ werr = dsdb_write_prefixes_from_schema_to_ldb(working_schema,
+ ldb,
+ working_schema);
+ if (!W_ERROR_IS_OK(werr)) {
+ /* restore previous schema */
+ if (cur_schema ) {
+ dsdb_reference_schema(ldb, cur_schema, false);
+ dsdb_make_schema_global(ldb, cur_schema);
+ }
+ DEBUG(0,("Failed to save updated prefixMap: %s\n",
+ win_errstr(werr)));
+ return werr;
+ }
+ }
+
ret = ldb_transaction_prepare_commit(ldb);
if (ret != LDB_SUCCESS) {
- DEBUG(0,(__location__ " Failed to prepare commit of transaction\n"));
+ /* restore previous schema */
+ if (cur_schema ) {
+ dsdb_reference_schema(ldb, cur_schema, false);
+ dsdb_make_schema_global(ldb, cur_schema);
+ }
+ DEBUG(0,(__location__ " Failed to prepare commit of transaction: %s\n",
+ ldb_errstring(ldb)));
return WERR_FOOBAR;
}
- ret = dsdb_load_partition_usn(ldb, objects->partition_dn, &seq_num2);
+ ret = dsdb_load_partition_usn(ldb, objects->partition_dn, &seq_num2, NULL);
if (ret != LDB_SUCCESS) {
+ /* restore previous schema */
+ if (cur_schema ) {
+ dsdb_reference_schema(ldb, cur_schema, false);
+ dsdb_make_schema_global(ldb, cur_schema);
+ }
DEBUG(0,(__location__ " Failed to load partition uSN\n"));
ldb_transaction_cancel(ldb);
return WERR_FOOBAR;
ret = ldb_transaction_commit(ldb);
if (ret != LDB_SUCCESS) {
+ /* restore previous schema */
+ if (cur_schema ) {
+ dsdb_reference_schema(ldb, cur_schema, false);
+ dsdb_make_schema_global(ldb, cur_schema);
+ }
DEBUG(0,(__location__ " Failed to commit transaction\n"));
return WERR_FOOBAR;
}
+ /*
+ * Reset the Schema used by ldb. This will lead to
+ * a schema cache being refreshed from database.
+ */
+ if (working_schema) {
+ cur_schema = dsdb_get_schema(ldb, NULL);
+ /* TODO: What we do in case dsdb_get_schema() fail?
+ * We can't fallback at this point anymore */
+ if (cur_schema) {
+ dsdb_make_schema_global(ldb, cur_schema);
+ }
+ }
DEBUG(2,("Replicated %u objects (%u linked attributes) for %s\n",
objects->num_objects, objects->linked_attributes_count,
return WERR_OK;
}
-static WERROR dsdb_convert_object(struct ldb_context *ldb,
- const struct dsdb_schema *schema,
- const struct drsuapi_DsReplicaObjectListItem *in,
- TALLOC_CTX *mem_ctx,
- struct ldb_message **_msg)
+static WERROR dsdb_origin_object_convert(struct ldb_context *ldb,
+ const struct dsdb_schema *schema,
+ const struct drsuapi_DsReplicaObjectListItem *in,
+ TALLOC_CTX *mem_ctx,
+ struct ldb_message **_msg)
{
WERROR status;
- uint32_t i;
+ unsigned int i;
struct ldb_message *msg;
if (!in->object.identifier) {
a = &in->object.attribute_ctr.attributes[i];
e = &msg->elements[i];
- status = dsdb_attribute_drsuapi_to_ldb(ldb, schema, a, msg->elements, e);
+ status = dsdb_attribute_drsuapi_to_ldb(ldb, schema, schema->prefixmap,
+ a, msg->elements, e);
W_ERROR_NOT_OK_RETURN(status);
}
TALLOC_CTX *mem_ctx,
const struct drsuapi_DsReplicaObjectListItem *first_object,
uint32_t *_num,
+ uint32_t dsdb_repl_flags,
struct drsuapi_DsReplicaObjectIdentifier2 **_ids)
{
WERROR status;
struct ldb_result *res;
int ret;
- schema = dsdb_get_schema(ldb);
- if (!schema) {
- return WERR_DS_SCHEMA_NOT_LOADED;
- }
-
for (cur = first_object; cur; cur = cur->next_object) {
num_objects++;
}
goto cancel;
}
+ schema = dsdb_get_schema(ldb, objects);
+ if (!schema) {
+ return WERR_DS_SCHEMA_NOT_LOADED;
+ }
+
for (i=0, cur = first_object; cur; cur = cur->next_object, i++) {
- status = dsdb_convert_object(ldb, schema,
- cur, objects, &objects[i]);
+ status = dsdb_origin_object_convert(ldb, schema, cur,
+ objects, &objects[i]);
if (!W_ERROR_IS_OK(status)) {
goto cancel;
}
goto cancel;
}
+ if (dsdb_repl_flags & DSDB_REPL_FLAG_ADD_NCNAME) {
+ /* check for possible NC creation */
+ for (i=0; i < num_objects; i++) {
+ struct ldb_message *msg = objects[i];
+ struct ldb_message_element *el;
+ struct ldb_dn *nc_dn;
+
+ if (ldb_msg_check_string_attribute(msg, "objectClass", "crossRef") == 0) {
+ continue;
+ }
+ el = ldb_msg_find_element(msg, "nCName");
+ if (el == NULL || el->num_values != 1) {
+ continue;
+ }
+ nc_dn = ldb_dn_from_ldb_val(objects, ldb, &el->values[0]);
+ if (!ldb_dn_validate(nc_dn)) {
+ continue;
+ }
+ ret = dsdb_create_partial_replica_NC(ldb, nc_dn);
+ if (ret != LDB_SUCCESS) {
+ status = WERR_DS_INTERNAL_FAILURE;
+ goto cancel;
+ }
+ }
+ }
+
for (i=0; i < num_objects; i++) {
struct dom_sid *sid = NULL;
struct ldb_request *add_req;
git.samba.org / nivanova / samba-autobuild / .git / blobdiff