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authorAndrew Tridgell <tridge@samba.org>2009-09-18 14:10:42 -0700
committerAndrew Tridgell <tridge@samba.org>2009-09-18 14:11:30 -0700
commitc2139e8e5646a8558d70c1ca4ce2d755497de8e1 (patch)
tree9f400d977baa55edc70fa39e1346fb2dda975a27 /source4/dsdb/samdb/ldb_modules
parent8dffa2300b633f5eaaef76627ef63705ab03d62f (diff)
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s4-drs: cope with dupliate linked attributes
With a w2k8-R2 DC, we sometimes get linked attribute updates via DRS which are duplicates of entries that we already have. We need to cope with this by using a remove/add pair in the ldb_modify() to avoid a "entry already exists" error
Diffstat (limited to 'source4/dsdb/samdb/ldb_modules')
-rw-r--r--source4/dsdb/samdb/ldb_modules/repl_meta_data.c42
1 files changed, 41 insertions, 1 deletions
diff --git a/source4/dsdb/samdb/ldb_modules/repl_meta_data.c b/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
index 26703528a7..283bdf7806 100644
--- a/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
+++ b/source4/dsdb/samdb/ldb_modules/repl_meta_data.c
@@ -2123,7 +2123,9 @@ linked_attributes[0]:
talloc_free(tmp_ctx);
return ret;
}
- ret_el->values = talloc_array(msg, struct ldb_val, 1);
+ /* we allocate two entries here, in case we need a remove/add
+ pair */
+ ret_el->values = talloc_array(msg, struct ldb_val, 2);
if (!ret_el->values) {
ldb_oom(ldb);
talloc_free(tmp_ctx);
@@ -2168,10 +2170,48 @@ linked_attributes[0]:
ret = ldb_wait(mod_req->handle, LDB_WAIT_ALL);
}
+ if (ret == LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS) {
+ /* the link destination exists, we need to update it
+ * by deleting the old one for the same DN then adding
+ * the new one */
+ msg->elements = talloc_realloc(msg, msg->elements,
+ struct ldb_message_element,
+ msg->num_elements+1);
+ if (msg->elements == NULL) {
+ ldb_oom(ldb);
+ talloc_free(tmp_ctx);
+ return LDB_ERR_OPERATIONS_ERROR;
+ }
+ /* this relies on the backend matching the old entry
+ only by the DN portion of the extended DN */
+ msg->elements[1] = msg->elements[0];
+ msg->elements[0].flags = LDB_FLAG_MOD_DELETE;
+ msg->num_elements++;
+
+ ret = ldb_build_mod_req(&mod_req, ldb, tmp_ctx,
+ msg,
+ NULL,
+ NULL,
+ ldb_op_default_callback,
+ NULL);
+ if (ret != LDB_SUCCESS) {
+ talloc_free(tmp_ctx);
+ return ret;
+ }
+
+ /* Run the new request */
+ ret = ldb_next_request(module, mod_req);
+
+ if (ret == LDB_SUCCESS) {
+ ret = ldb_wait(mod_req->handle, LDB_WAIT_ALL);
+ }
+ }
+
if (ret != LDB_SUCCESS) {
ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s' %s\n",
ldb_errstring(ldb),
ldb_ldif_message_string(ldb, tmp_ctx, LDB_CHANGETYPE_MODIFY, msg));
+ ret = LDB_SUCCESS;
}
talloc_free(tmp_ctx);