In QUIC version >= 38, enables random padding of size [1, 256]

net/quic/core/quic_stream.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_stream.h"
 
 #include "net/quic/core/quic_flow_controller.h"
 #include "net/quic/core/quic_session.h"
 #include "net/quic/platform/api/quic_bug_tracker.h"
 #include "net/quic/platform/api/quic_logging.h"
@@ skipping 55 matching lines @@
       perspective_(session_->perspective()),
       flow_controller_(session_->connection(),
                        id_,
                        perspective_,
                        GetReceivedFlowControlWindow(session),
                        GetInitialStreamFlowControlWindowToSend(session),
                        session_->flow_controller()->auto_tune_receive_window(),
                        session_->flow_controller()),
       connection_flow_controller_(session_->flow_controller()),
       stream_contributes_to_connection_flow_control_(true),
-      busy_counter_(0) {
+      busy_counter_(0),
+      add_random_padding_after_fin_(false) {
   SetFromConfig();
 }
 
 QuicStream::~QuicStream() {}
 
 void QuicStream::SetFromConfig() {}
 
 void QuicStream::OnStreamFrame(const QuicStreamFrame& frame) {
   DCHECK_EQ(frame.stream_id, id_);
 
@@ skipping 262 matching lines @@
     busy_counter_ = 0;
   }
   return consumed_data;
 }
 
 QuicConsumedData QuicStream::WritevDataInner(
     QuicIOVector iov,
     QuicStreamOffset offset,
     bool fin,
     QuicReferenceCountedPointer<QuicAckListenerInterface> ack_listener) {
-  return session()->WritevData(this, id(), iov, offset, fin,
+  StreamSendingState state = fin ? FIN : NO_FIN;
+  if (fin && add_random_padding_after_fin_) {
+    state = FIN_AND_PADDING;
+  }
+  return session()->WritevData(this, id(), iov, offset, state,
                                std::move(ack_listener));
 }
 
 void QuicStream::CloseReadSide() {
   if (read_side_closed_) {
     return;
   }
   QUIC_DLOG(INFO) << ENDPOINT << "Done reading from stream " << id();
 
   read_side_closed_ = true;
@@ skipping 106 matching lines @@
     connection_flow_controller_->AddBytesConsumed(bytes);
   }
 }
 
 void QuicStream::UpdateSendWindowOffset(QuicStreamOffset new_window) {
   if (flow_controller_.UpdateSendWindowOffset(new_window)) {
     OnCanWrite();
   }
 }
 
+void QuicStream::AddRandomPaddingAfterFin() {
+  add_random_padding_after_fin_ = true;
+}
+
 }  // namespace net