104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
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/*
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* Copyright 2017 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 PC_DTLS_SRTP_TRANSPORT_H_
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#define PC_DTLS_SRTP_TRANSPORT_H_
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#include <vector>
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#include "absl/types/optional.h"
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#include "api/crypto_params.h"
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#include "api/rtc_error.h"
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#include "p2p/base/dtls_transport_internal.h"
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#include "p2p/base/packet_transport_internal.h"
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#include "pc/srtp_transport.h"
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#include "rtc_base/buffer.h"
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#include "rtc_base/third_party/sigslot/sigslot.h"
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namespace webrtc {
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// The subclass of SrtpTransport is used for DTLS-SRTP. When the DTLS handshake
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// is finished, it extracts the keying materials from DtlsTransport and
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// configures the SrtpSessions in the base class.
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class DtlsSrtpTransport : public SrtpTransport {
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public:
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explicit DtlsSrtpTransport(bool rtcp_mux_enabled);
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// Set P2P layer RTP/RTCP DtlsTransports. When using RTCP-muxing,
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// |rtcp_dtls_transport| is null.
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void SetDtlsTransports(cricket::DtlsTransportInternal* rtp_dtls_transport,
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cricket::DtlsTransportInternal* rtcp_dtls_transport);
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void SetRtcpMuxEnabled(bool enable) override;
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// Set the header extension ids that should be encrypted.
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void UpdateSendEncryptedHeaderExtensionIds(
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const std::vector<int>& send_extension_ids);
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void UpdateRecvEncryptedHeaderExtensionIds(
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const std::vector<int>& recv_extension_ids);
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sigslot::signal<DtlsSrtpTransport*, bool> SignalDtlsSrtpSetupFailure;
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sigslot::signal<> SignalDtlsStateChange;
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RTCError SetSrtpSendKey(const cricket::CryptoParams& params) override {
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return RTCError(RTCErrorType::UNSUPPORTED_OPERATION,
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"Set SRTP keys for DTLS-SRTP is not supported.");
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}
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RTCError SetSrtpReceiveKey(const cricket::CryptoParams& params) override {
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return RTCError(RTCErrorType::UNSUPPORTED_OPERATION,
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"Set SRTP keys for DTLS-SRTP is not supported.");
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}
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// If |active_reset_srtp_params_| is set to be true, the SRTP parameters will
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// be reset whenever the DtlsTransports are reset.
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void SetActiveResetSrtpParams(bool active_reset_srtp_params) {
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active_reset_srtp_params_ = active_reset_srtp_params;
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}
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private:
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bool IsDtlsActive();
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bool IsDtlsConnected();
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bool IsDtlsWritable();
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bool DtlsHandshakeCompleted();
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void MaybeSetupDtlsSrtp();
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void SetupRtpDtlsSrtp();
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void SetupRtcpDtlsSrtp();
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bool ExtractParams(cricket::DtlsTransportInternal* dtls_transport,
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int* selected_crypto_suite,
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rtc::ZeroOnFreeBuffer<unsigned char>* send_key,
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rtc::ZeroOnFreeBuffer<unsigned char>* recv_key);
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void SetDtlsTransport(cricket::DtlsTransportInternal* new_dtls_transport,
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cricket::DtlsTransportInternal** old_dtls_transport);
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void SetRtpDtlsTransport(cricket::DtlsTransportInternal* rtp_dtls_transport);
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void SetRtcpDtlsTransport(
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cricket::DtlsTransportInternal* rtcp_dtls_transport);
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void OnDtlsState(cricket::DtlsTransportInternal* dtls_transport,
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cricket::DtlsTransportState state);
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// Override the SrtpTransport::OnWritableState.
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void OnWritableState(rtc::PacketTransportInternal* packet_transport) override;
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// Owned by the TransportController.
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cricket::DtlsTransportInternal* rtp_dtls_transport_ = nullptr;
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cricket::DtlsTransportInternal* rtcp_dtls_transport_ = nullptr;
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// The encrypted header extension IDs.
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absl::optional<std::vector<int>> send_extension_ids_;
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absl::optional<std::vector<int>> recv_extension_ids_;
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bool active_reset_srtp_params_ = false;
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};
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} // namespace webrtc
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#endif // PC_DTLS_SRTP_TRANSPORT_H_
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