Handle case where UDP packet contains multiple DTLS records.

webrtc/p2p/base/dtlstransportchannel_unittest.cc

 /*
  *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 652 matching lines @@
 
 // Create two channels with DTLS, and transfer some data.
 TEST_F(DtlsTransportChannelTest, TestTransferDtlsTwoChannels) {
   SetChannelCount(2);
   PrepareDtls(true, true, rtc::KT_DEFAULT);
   ASSERT_TRUE(Connect());
   TestTransfer(0, 1000, 100, false);
   TestTransfer(1, 1000, 100, false);
 }
 
+// Connect with DTLS, combine multiple DTLS records into one packet.
+// Our DTLS implementation doesn't do this, but other implementations may;
+// see https://tools.ietf.org/html/rfc6347#section-4.1.1.
+// This has caused interoperability problems with ORTCLib in the past.
+TEST_F(DtlsTransportChannelTest, TestTransferDtlsCombineRecords) {
+  PrepareDtls(true, true, rtc::KT_DEFAULT);
+  ASSERT_TRUE(Connect());
+  // Our DTLS implementation always sends one record per packet, so to simulate
+  // an endpoint that sends multiple records per packet, we configure the fake
+  // ICE transport to combine every two consecutive packets into a single
+  // packet.
+  cricket::FakeIceTransport* transport = client1_.GetFakeIceTransort(0);
+  transport->combine_outgoing_packets(true);
+  TestTransfer(0, 500, 100, false);
+}
+
 // Connect with A doing DTLS and B not, and transfer some data.
 TEST_F(DtlsTransportChannelTest, TestTransferDtlsRejected) {
   PrepareDtls(true, false, rtc::KT_DEFAULT);
   ASSERT_TRUE(Connect());
   TestTransfer(0, 1000, 100, false);
 }
 
 // Connect with B doing DTLS and A not, and transfer some data.
 TEST_F(DtlsTransportChannelTest, TestTransferDtlsNotOffered) {
   PrepareDtls(false, true, rtc::KT_DEFAULT);
@@ skipping 426 matching lines @@
             std::vector<DtlsTransportEvent>{
                 CALLER_RECEIVES_CLIENTHELLO, CALLER_RECEIVES_FINGERPRINT,
                 CALLER_WRITABLE, HANDSHAKE_FINISHES},
             std::vector<DtlsTransportEvent>{
                 CALLER_RECEIVES_CLIENTHELLO, CALLER_WRITABLE,
                 CALLER_RECEIVES_FINGERPRINT, HANDSHAKE_FINISHES},
             std::vector<DtlsTransportEvent>{CALLER_RECEIVES_CLIENTHELLO,
                                             CALLER_WRITABLE, HANDSHAKE_FINISHES,
                                             CALLER_RECEIVES_FINGERPRINT}),
         ::testing::Bool()));