1 files changed, 148 insertions, 0 deletions
diff --git a/third_party/libwebrtc/pc/dtls_transport.cc b/third_party/libwebrtc/pc/dtls_transport.cc
new file mode 100644
index 0000000000..15eed9e47b
--- /dev/null
+++ b/third_party/libwebrtc/pc/dtls_transport.cc
@@ -0,0 +1,148 @@
+/*
+ *  Copyright 2018 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.
+ */
+
+#include "pc/dtls_transport.h"
+
+#include <utility>
+
+#include "absl/types/optional.h"
+#include "api/dtls_transport_interface.h"
+#include "api/make_ref_counted.h"
+#include "api/sequence_checker.h"
+#include "pc/ice_transport.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/ssl_stream_adapter.h"
+
+namespace webrtc {
+
+// Implementation of DtlsTransportInterface
+DtlsTransport::DtlsTransport(
+    std::unique_ptr<cricket::DtlsTransportInternal> internal)
+    : owner_thread_(rtc::Thread::Current()),
+      info_(DtlsTransportState::kNew),
+      internal_dtls_transport_(std::move(internal)),
+      ice_transport_(rtc::make_ref_counted<IceTransportWithPointer>(
+          internal_dtls_transport_->ice_transport())) {
+  RTC_DCHECK(internal_dtls_transport_.get());
+  internal_dtls_transport_->SubscribeDtlsTransportState(
+      [this](cricket::DtlsTransportInternal* transport,
+             DtlsTransportState state) {
+        OnInternalDtlsState(transport, state);
+      });
+  UpdateInformation();
+}
+
+DtlsTransport::~DtlsTransport() {
+  // We depend on the signaling thread to call Clear() before dropping
+  // its last reference to this object.
+  RTC_DCHECK(owner_thread_->IsCurrent() || !internal_dtls_transport_);
+}
+
+DtlsTransportInformation DtlsTransport::Information() {
+  MutexLock lock(&lock_);
+  return info_;
+}
+
+void DtlsTransport::RegisterObserver(DtlsTransportObserverInterface* observer) {
+  RTC_DCHECK_RUN_ON(owner_thread_);
+  RTC_DCHECK(observer);
+  observer_ = observer;
+}
+
+void DtlsTransport::UnregisterObserver() {
+  RTC_DCHECK_RUN_ON(owner_thread_);
+  observer_ = nullptr;
+}
+
+rtc::scoped_refptr<IceTransportInterface> DtlsTransport::ice_transport() {
+  return ice_transport_;
+}
+
+// Internal functions
+void DtlsTransport::Clear() {
+  RTC_DCHECK_RUN_ON(owner_thread_);
+  RTC_DCHECK(internal());
+  bool must_send_event =
+      (internal()->dtls_state() != DtlsTransportState::kClosed);
+  // The destructor of cricket::DtlsTransportInternal calls back
+  // into DtlsTransport, so we can't hold the lock while releasing.
+  std::unique_ptr<cricket::DtlsTransportInternal> transport_to_release;
+  {
+    MutexLock lock(&lock_);
+    transport_to_release = std::move(internal_dtls_transport_);
+    ice_transport_->Clear();
+  }
+  UpdateInformation();
+  if (observer_ && must_send_event) {
+    observer_->OnStateChange(Information());
+  }
+}
+
+void DtlsTransport::OnInternalDtlsState(
+    cricket::DtlsTransportInternal* transport,
+    DtlsTransportState state) {
+  RTC_DCHECK_RUN_ON(owner_thread_);
+  RTC_DCHECK(transport == internal());
+  RTC_DCHECK(state == internal()->dtls_state());
+  UpdateInformation();
+  if (observer_) {
+    observer_->OnStateChange(Information());
+  }
+}
+
+void DtlsTransport::UpdateInformation() {
+  RTC_DCHECK_RUN_ON(owner_thread_);
+  MutexLock lock(&lock_);
+  if (internal_dtls_transport_) {
+    if (internal_dtls_transport_->dtls_state() ==
+        DtlsTransportState::kConnected) {
+      bool success = true;
+      rtc::SSLRole internal_role;
+      absl::optional<DtlsTransportTlsRole> role;
+      int ssl_cipher_suite;
+      int tls_version;
+      int srtp_cipher;
+      success &= internal_dtls_transport_->GetDtlsRole(&internal_role);
+      if (success) {
+        switch (internal_role) {
+          case rtc::SSL_CLIENT:
+            role = DtlsTransportTlsRole::kClient;
+            break;
+          case rtc::SSL_SERVER:
+            role = DtlsTransportTlsRole::kServer;
+            break;
+        }
+      }
+      success &= internal_dtls_transport_->GetSslVersionBytes(&tls_version);
+      success &= internal_dtls_transport_->GetSslCipherSuite(&ssl_cipher_suite);
+      success &= internal_dtls_transport_->GetSrtpCryptoSuite(&srtp_cipher);
+      if (success) {
+        info_ = DtlsTransportInformation(
+            internal_dtls_transport_->dtls_state(), role, tls_version,
+            ssl_cipher_suite, srtp_cipher,
+            internal_dtls_transport_->GetRemoteSSLCertChain());
+      } else {
+        RTC_LOG(LS_ERROR) << "DtlsTransport in connected state has incomplete "
+                             "TLS information";
+        info_ = DtlsTransportInformation(
+            internal_dtls_transport_->dtls_state(), role, absl::nullopt,
+            absl::nullopt, absl::nullopt,
+            internal_dtls_transport_->GetRemoteSSLCertChain());
+      }
+    } else {
+      info_ = DtlsTransportInformation(internal_dtls_transport_->dtls_state());
+    }
+  } else {
+    info_ = DtlsTransportInformation(DtlsTransportState::kClosed);
+  }
+}
+
+}  // namespace webrtc