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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.
*/
#ifndef API_DTLS_TRANSPORT_INTERFACE_H_
#define API_DTLS_TRANSPORT_INTERFACE_H_
#include <memory>
#include "absl/base/attributes.h"
#include "absl/types/optional.h"
#include "api/ice_transport_interface.h"
#include "api/ref_count.h"
#include "api/rtc_error.h"
#include "api/scoped_refptr.h"
#include "rtc_base/ssl_certificate.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
// States of a DTLS transport, corresponding to the JS API specification.
enum class DtlsTransportState {
kNew, // Has not started negotiating yet.
kConnecting, // In the process of negotiating a secure connection.
kConnected, // Completed negotiation and verified fingerprints.
kClosed, // Intentionally closed.
kFailed, // Failure due to an error or failing to verify a remote
// fingerprint.
kNumValues
};
enum class DtlsTransportTlsRole {
kServer, // Other end sends CLIENT_HELLO
kClient // This end sends CLIENT_HELLO
};
// This object gives snapshot information about the changeable state of a
// DTLSTransport.
class RTC_EXPORT DtlsTransportInformation {
public:
DtlsTransportInformation();
explicit DtlsTransportInformation(DtlsTransportState state);
DtlsTransportInformation(
DtlsTransportState state,
absl::optional<DtlsTransportTlsRole> role,
absl::optional<int> tls_version,
absl::optional<int> ssl_cipher_suite,
absl::optional<int> srtp_cipher_suite,
std::unique_ptr<rtc::SSLCertChain> remote_ssl_certificates);
ABSL_DEPRECATED("Use version with role parameter")
DtlsTransportInformation(
DtlsTransportState state,
absl::optional<int> tls_version,
absl::optional<int> ssl_cipher_suite,
absl::optional<int> srtp_cipher_suite,
std::unique_ptr<rtc::SSLCertChain> remote_ssl_certificates);
// Copy and assign
DtlsTransportInformation(const DtlsTransportInformation& c);
DtlsTransportInformation& operator=(const DtlsTransportInformation& c);
// Move
DtlsTransportInformation(DtlsTransportInformation&& other) = default;
DtlsTransportInformation& operator=(DtlsTransportInformation&& other) =
default;
DtlsTransportState state() const { return state_; }
absl::optional<DtlsTransportTlsRole> role() const { return role_; }
absl::optional<int> tls_version() const { return tls_version_; }
absl::optional<int> ssl_cipher_suite() const { return ssl_cipher_suite_; }
absl::optional<int> srtp_cipher_suite() const { return srtp_cipher_suite_; }
// The accessor returns a temporary pointer, it does not release ownership.
const rtc::SSLCertChain* remote_ssl_certificates() const {
return remote_ssl_certificates_.get();
}
private:
DtlsTransportState state_;
absl::optional<DtlsTransportTlsRole> role_;
absl::optional<int> tls_version_;
absl::optional<int> ssl_cipher_suite_;
absl::optional<int> srtp_cipher_suite_;
std::unique_ptr<rtc::SSLCertChain> remote_ssl_certificates_;
};
class DtlsTransportObserverInterface {
public:
// This callback carries information about the state of the transport.
// The argument is a pass-by-value snapshot of the state.
virtual void OnStateChange(DtlsTransportInformation info) = 0;
// This callback is called when an error occurs, causing the transport
// to go to the kFailed state.
virtual void OnError(RTCError error) = 0;
protected:
virtual ~DtlsTransportObserverInterface() = default;
};
// A DTLS transport, as represented to the outside world.
// This object is created on the network thread, and can only be
// accessed on that thread, except for functions explicitly marked otherwise.
// References can be held by other threads, and destruction can therefore
// be initiated by other threads.
class DtlsTransportInterface : public webrtc::RefCountInterface {
public:
// Returns a pointer to the ICE transport that is owned by the DTLS transport.
virtual rtc::scoped_refptr<IceTransportInterface> ice_transport() = 0;
// Returns information on the state of the DtlsTransport.
// This function can be called from other threads.
virtual DtlsTransportInformation Information() = 0;
// Observer management.
virtual void RegisterObserver(DtlsTransportObserverInterface* observer) = 0;
virtual void UnregisterObserver() = 0;
};
} // namespace webrtc
#endif // API_DTLS_TRANSPORT_INTERFACE_H_