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/*
* 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() {
// TODO(tommi): Due to a reference being held by the RtpSenderBase
// implementation, the last reference to the `DtlsTransport` instance can
// be released on the signaling thread.
// RTC_DCHECK_RUN_ON(owner_thread_);
// We depend on the signaling thread to call Clear() before dropping
// its last reference to this object.
// If there are non `owner_thread_` references outstanding, and those
// references are the last ones released, we depend on Clear() having been
// called from the owner_thread before the last reference is deleted.
// `Clear()` is currently called from `JsepTransport::~JsepTransport`.
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);
internal_dtls_transport_.reset();
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_);
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) {
set_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";
set_info(DtlsTransportInformation(
internal_dtls_transport_->dtls_state(), role, absl::nullopt,
absl::nullopt, absl::nullopt,
internal_dtls_transport_->GetRemoteSSLCertChain()));
}
} else {
set_info(
DtlsTransportInformation(internal_dtls_transport_->dtls_state()));
}
} else {
set_info(DtlsTransportInformation(DtlsTransportState::kClosed));
}
}
} // namespace webrtc
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