Refactor, prerequisite for DNS-over-TLS pipelining
This change should have no effect on behavior, but it divides functionality
out into classes in a way that will enable pipelining.
It also adds unit tests for the newly divided functionality.
Test: Unit and integration tests pass.
Bug: 63448521
Change-Id: I08948be304b7a3e4ba10f754ef58bd41db6824c4
diff --git a/server/dns/IDnsTlsSocket.h b/server/dns/IDnsTlsSocket.h
new file mode 100644
index 0000000..1551418
--- /dev/null
+++ b/server/dns/IDnsTlsSocket.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _DNS_IDNSTLSSOCKET_H
+#define _DNS_IDNSTLSSOCKET_H
+
+#include <cstdint>
+#include <cstddef>
+
+#include <netdutils/Slice.h>
+
+#include "dns/DnsTlsServer.h"
+
+namespace android {
+namespace net {
+
+class IDnsTlsSocketObserver;
+class DnsTlsSessionCache;
+
+// A class for managing a TLS socket that sends and receives messages in
+// [length][value] format, with a 2-byte length (i.e. DNS-over-TCP format).
+class IDnsTlsSocket {
+public:
+ virtual ~IDnsTlsSocket() {};
+ // Send a query on the provided SSL socket. |query| contains
+ // the body of a query, not including the ID bytes. Returns the server's response.
+ virtual DnsTlsServer::Result query(uint16_t id, const netdutils::Slice query) = 0;
+};
+
+} // end of namespace net
+} // end of namespace android
+
+#endif // _DNS_IDNSTLSSOCKET_H