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109 lines
4.1 KiB
109 lines
4.1 KiB
4 months ago
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/*
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* Copyright 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef API_DTLS_TRANSPORT_INTERFACE_H_
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#define API_DTLS_TRANSPORT_INTERFACE_H_
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#include <memory>
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#include <utility>
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#include "absl/types/optional.h"
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#include "api/ice_transport_interface.h"
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#include "api/rtc_error.h"
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#include "api/scoped_refptr.h"
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#include "rtc_base/ref_count.h"
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#include "rtc_base/ssl_certificate.h"
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#include "rtc_base/system/rtc_export.h"
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namespace webrtc {
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// States of a DTLS transport, corresponding to the JS API specification.
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// http://w3c.github.io/webrtc-pc/#dom-rtcdtlstransportstate
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enum class DtlsTransportState {
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kNew, // Has not started negotiating yet.
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kConnecting, // In the process of negotiating a secure connection.
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kConnected, // Completed negotiation and verified fingerprints.
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kClosed, // Intentionally closed.
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kFailed, // Failure due to an error or failing to verify a remote
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// fingerprint.
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kNumValues
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};
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// This object gives snapshot information about the changeable state of a
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// DTLSTransport.
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class RTC_EXPORT DtlsTransportInformation {
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public:
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DtlsTransportInformation();
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explicit DtlsTransportInformation(DtlsTransportState state);
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DtlsTransportInformation(
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DtlsTransportState state,
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absl::optional<int> tls_version,
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absl::optional<int> ssl_cipher_suite,
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absl::optional<int> srtp_cipher_suite,
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std::unique_ptr<rtc::SSLCertChain> remote_ssl_certificates);
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// Copy and assign
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DtlsTransportInformation(const DtlsTransportInformation& c);
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DtlsTransportInformation& operator=(const DtlsTransportInformation& c);
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// Move
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DtlsTransportInformation(DtlsTransportInformation&& other) = default;
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DtlsTransportInformation& operator=(DtlsTransportInformation&& other) =
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default;
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DtlsTransportState state() const { return state_; }
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absl::optional<int> tls_version() const { return tls_version_; }
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absl::optional<int> ssl_cipher_suite() const { return ssl_cipher_suite_; }
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absl::optional<int> srtp_cipher_suite() const { return srtp_cipher_suite_; }
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// The accessor returns a temporary pointer, it does not release ownership.
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const rtc::SSLCertChain* remote_ssl_certificates() const {
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return remote_ssl_certificates_.get();
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}
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private:
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DtlsTransportState state_;
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absl::optional<int> tls_version_;
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absl::optional<int> ssl_cipher_suite_;
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absl::optional<int> srtp_cipher_suite_;
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std::unique_ptr<rtc::SSLCertChain> remote_ssl_certificates_;
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};
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class DtlsTransportObserverInterface {
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public:
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// This callback carries information about the state of the transport.
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// The argument is a pass-by-value snapshot of the state.
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virtual void OnStateChange(DtlsTransportInformation info) = 0;
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// This callback is called when an error occurs, causing the transport
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// to go to the kFailed state.
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virtual void OnError(RTCError error) = 0;
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protected:
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virtual ~DtlsTransportObserverInterface() = default;
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};
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// A DTLS transport, as represented to the outside world.
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// This object is created on the network thread, and can only be
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// accessed on that thread, except for functions explicitly marked otherwise.
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// References can be held by other threads, and destruction can therefore
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// be initiated by other threads.
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class DtlsTransportInterface : public rtc::RefCountInterface {
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public:
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// Returns a pointer to the ICE transport that is owned by the DTLS transport.
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virtual rtc::scoped_refptr<IceTransportInterface> ice_transport() = 0;
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// Returns information on the state of the DtlsTransport.
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// This function can be called from other threads.
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virtual DtlsTransportInformation Information() = 0;
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// Observer management.
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virtual void RegisterObserver(DtlsTransportObserverInterface* observer) = 0;
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virtual void UnregisterObserver() = 0;
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};
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} // namespace webrtc
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#endif // API_DTLS_TRANSPORT_INTERFACE_H_
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