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/*
* Copyright 2017 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 PC_DTLSSRTPTRANSPORT_H_
#define PC_DTLSSRTPTRANSPORT_H_
#include <memory>
#include <string>
#include <vector>
#include "p2p/base/dtlstransportinternal.h"
#include "pc/rtptransportinternaladapter.h"
#include "pc/srtptransport.h"
#include "rtc_base/buffer.h"
namespace webrtc {
// This class is intended to be used as an RtpTransport and it wraps both an
// SrtpTransport and DtlsTransports(RTP/RTCP). When the DTLS handshake is
// finished, it extracts the keying materials from DtlsTransport and sets them
// to SrtpTransport.
class DtlsSrtpTransport : public RtpTransportInternalAdapter {
public:
explicit DtlsSrtpTransport(
std::unique_ptr<webrtc::SrtpTransport> srtp_transport);
// Set P2P layer RTP/RTCP DtlsTransports. When using RTCP-muxing,
// |rtcp_dtls_transport| is null.
void SetDtlsTransports(cricket::DtlsTransportInternal* rtp_dtls_transport,
cricket::DtlsTransportInternal* rtcp_dtls_transport);
void SetRtcpMuxEnabled(bool enable) override;
// Set the header extension ids that should be encrypted.
void UpdateSendEncryptedHeaderExtensionIds(
const std::vector<int>& send_extension_ids);
void UpdateRecvEncryptedHeaderExtensionIds(
const std::vector<int>& recv_extension_ids);
bool IsSrtpActive() const override { return srtp_transport_->IsSrtpActive(); }
// Cache RTP Absoulute SendTime extension header ID. This is only used when
// external authentication is enabled.
void CacheRtpAbsSendTimeHeaderExtension(int rtp_abs_sendtime_extn_id) {
srtp_transport_->CacheRtpAbsSendTimeHeaderExtension(
rtp_abs_sendtime_extn_id);
}
sigslot::signal2<DtlsSrtpTransport*, bool> SignalDtlsSrtpSetupFailure;
RTCError SetSrtpSendKey(const cricket::CryptoParams& params) override {
return RTCError(RTCErrorType::UNSUPPORTED_OPERATION,
"Set SRTP keys for DTLS-SRTP is not supported.");
}
RTCError SetSrtpReceiveKey(const cricket::CryptoParams& params) override {
return RTCError(RTCErrorType::UNSUPPORTED_OPERATION,
"Set SRTP keys for DTLS-SRTP is not supported.");
}
private:
bool IsDtlsActive();
bool IsDtlsConnected();
bool IsDtlsWritable();
bool DtlsHandshakeCompleted();
void MaybeSetupDtlsSrtp();
void SetupRtpDtlsSrtp();
void SetupRtcpDtlsSrtp();
bool ExtractParams(cricket::DtlsTransportInternal* dtls_transport,
int* selected_crypto_suite,
rtc::ZeroOnFreeBuffer<unsigned char>* send_key,
rtc::ZeroOnFreeBuffer<unsigned char>* recv_key);
void SetDtlsTransport(cricket::DtlsTransportInternal* new_dtls_transport,
cricket::DtlsTransportInternal** old_dtls_transport);
void SetRtpDtlsTransport(cricket::DtlsTransportInternal* rtp_dtls_transport);
void SetRtcpDtlsTransport(
cricket::DtlsTransportInternal* rtcp_dtls_transport);
void UpdateWritableStateAndMaybeSetupDtlsSrtp();
// Set the writability and fire the SignalWritableState if the writability
// changes.
void SetWritable(bool writable);
void OnDtlsState(cricket::DtlsTransportInternal* dtls_transport,
cricket::DtlsTransportState state);
void OnWritableState(bool writable);
void OnSentPacket(const rtc::SentPacket& sent_packet);
void OnPacketReceived(bool rtcp,
rtc::CopyOnWriteBuffer* packet,
const rtc::PacketTime& packet_time);
void OnReadyToSend(bool ready);
void OnNetworkRouteChanged(rtc::Optional<rtc::NetworkRoute> network_route);
bool writable_ = false;
std::unique_ptr<SrtpTransport> srtp_transport_;
// Owned by the TransportController.
cricket::DtlsTransportInternal* rtp_dtls_transport_ = nullptr;
cricket::DtlsTransportInternal* rtcp_dtls_transport_ = nullptr;
// The encrypted header extension IDs.
rtc::Optional<std::vector<int>> send_extension_ids_;
rtc::Optional<std::vector<int>> recv_extension_ids_;
};
} // namespace webrtc
#endif // PC_DTLSSRTPTRANSPORT_H_