double-check and limit which type of attributes can have aliases

diff --git a/src/lib/util/dict_util.c b/src/lib/util/dict_util.c
index 2fbf89721374b8e1db94bdda14a8c691e44823a9..f3b3df1837976ed461b644740c4ad1ff416b422e 100644 (file)
--- a/src/lib/util/dict_util.c
+++ b/src/lib/util/dict_util.c
@@ -1311,6 +1311,19 @@ int dict_attr_alias_add(fr_dict_attr_t const *parent, char const *alias, fr_dict
        fr_dict_attr_t *self;
        fr_hash_table_t *namespace;
 
+       switch (parent->type) {
+       case FR_TYPE_TLV:
+       case FR_TYPE_STRUCT:
+       case FR_TYPE_VENDOR:
+       case FR_TYPE_VSA:
+               break;
+
+       default:
+               fr_strerror_printf("Cannot add ALIAS to %s of data type '%s'",
+                                  parent->name, fr_type_to_str(parent->type));
+               return -1;
+       }
+
        da = dict_attr_by_name(NULL, parent, alias);
        if (da) {
                fr_strerror_printf("ALIAS '%s' conflicts with another attribute in namespace %s",