1 files changed, 11 insertions, 0 deletions
diff --git a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h
index ce26f5d524..ca5779e1d7 100644
--- a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h
+++ b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h
@@ -28,6 +28,13 @@
 
 extern grpc_core::TraceFlag grpc_trace_cares_address_sorting;
 
+extern grpc_core::TraceFlag grpc_trace_cares_resolver;
+
+#define GRPC_CARES_TRACE_LOG(format, ...)                         \
+  if (grpc_trace_cares_resolver.enabled()) {                      \
+    gpr_log(GPR_DEBUG, "(c-ares resolver) " format, __VA_ARGS__); \
+  }
+
 typedef struct grpc_ares_request grpc_ares_request;
 
 /* Asynchronously resolve \a name. Use \a default_port if a port isn't
@@ -70,6 +77,10 @@ void grpc_ares_cleanup(void);
  * and destroys the grpc_ares_request */
 void grpc_ares_complete_request_locked(grpc_ares_request* request);
 
+/* Indicates whether or not AAAA queries should be attempted. */
+/* E.g., return false if ipv6 is known to not be available. */
+bool grpc_ares_query_ipv6();
+
 /* Exposed only for testing */
 void grpc_cares_wrapper_test_only_address_sorting_sort(
     grpc_lb_addresses* lb_addrs);