s3: Try to avoid dns searches with an empty site

diff --git a/source3/libsmb/dsgetdcname.c b/source3/libsmb/dsgetdcname.c
index cc709465769061516492d637acd47964814cce73..89a3a6e6aae1390bfe714f8447da66c013b3724a 100644 (file)
--- a/source3/libsmb/dsgetdcname.c
+++ b/source3/libsmb/dsgetdcname.c
@@ -1137,7 +1137,7 @@ NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
                return NT_STATUS_INVALID_PARAMETER;
        }
 
-       if (!site_name) {
+       if ((site_name == NULL) || (site_name[0] == '\0')) {
                query_site = sitename_fetch(domain_name);
        } else {
                query_site = SMB_STRDUP(site_name);