1 files changed, 105 insertions, 0 deletions
diff --git a/third_party/libwebrtc/pc/dtls_srtp_transport.h b/third_party/libwebrtc/pc/dtls_srtp_transport.h
new file mode 100644
index 0000000000..0f8338ca0d
--- /dev/null
+++ b/third_party/libwebrtc/pc/dtls_srtp_transport.h
@@ -0,0 +1,105 @@
+/*
+ *  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_DTLS_SRTP_TRANSPORT_H_
+#define PC_DTLS_SRTP_TRANSPORT_H_
+
+#include <functional>
+#include <string>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/crypto_params.h"
+#include "api/dtls_transport_interface.h"
+#include "api/rtc_error.h"
+#include "p2p/base/dtls_transport_internal.h"
+#include "p2p/base/packet_transport_internal.h"
+#include "pc/srtp_transport.h"
+#include "rtc_base/buffer.h"
+
+namespace webrtc {
+
+// The subclass of SrtpTransport is used for DTLS-SRTP. When the DTLS handshake
+// is finished, it extracts the keying materials from DtlsTransport and
+// configures the SrtpSessions in the base class.
+class DtlsSrtpTransport : public SrtpTransport {
+ public:
+  DtlsSrtpTransport(bool rtcp_mux_enabled, const FieldTrialsView& field_trials);
+
+  // 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);
+
+  void SetOnDtlsStateChange(std::function<void(void)> callback);
+
+  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.");
+  }
+
+  // If `active_reset_srtp_params_` is set to be true, the SRTP parameters will
+  // be reset whenever the DtlsTransports are reset.
+  void SetActiveResetSrtpParams(bool active_reset_srtp_params) {
+    active_reset_srtp_params_ = active_reset_srtp_params;
+  }
+
+ 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 OnDtlsState(cricket::DtlsTransportInternal* dtls_transport,
+                   DtlsTransportState state);
+
+  // Override the SrtpTransport::OnWritableState.
+  void OnWritableState(rtc::PacketTransportInternal* packet_transport) override;
+
+  // Owned by the TransportController.
+  cricket::DtlsTransportInternal* rtp_dtls_transport_ = nullptr;
+  cricket::DtlsTransportInternal* rtcp_dtls_transport_ = nullptr;
+
+  // The encrypted header extension IDs.
+  absl::optional<std::vector<int>> send_extension_ids_;
+  absl::optional<std::vector<int>> recv_extension_ids_;
+
+  bool active_reset_srtp_params_ = false;
+  std::function<void(void)> on_dtls_state_change_;
+};
+
+}  // namespace webrtc
+
+#endif  // PC_DTLS_SRTP_TRANSPORT_H_