Revert of make the DtlsTransportWrapper inherit form DtlsTransportInternal

webrtc/p2p/base/transportchannel.h

+/*
+ *  Copyright 2004 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 WEBRTC_P2P_BASE_TRANSPORTCHANNEL_H_
+#define WEBRTC_P2P_BASE_TRANSPORTCHANNEL_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "webrtc/base/asyncpacketsocket.h"
+#include "webrtc/base/basictypes.h"
+#include "webrtc/base/constructormagic.h"
+#include "webrtc/base/dscp.h"
+#include "webrtc/base/sigslot.h"
+#include "webrtc/base/socket.h"
+#include "webrtc/base/sslidentity.h"
+#include "webrtc/base/sslstreamadapter.h"
+#include "webrtc/p2p/base/candidate.h"
+#include "webrtc/p2p/base/candidatepairinterface.h"
+#include "webrtc/p2p/base/icetransportinternal.h"
+#include "webrtc/p2p/base/jseptransport.h"
+#include "webrtc/p2p/base/packettransportinterface.h"
+#include "webrtc/p2p/base/transportdescription.h"
+
+namespace cricket {
+
+class Candidate;
+
+// Flags for SendPacket/SignalReadPacket.
+enum PacketFlags {
+  PF_NORMAL       = 0x00,  // A normal packet.
+  PF_SRTP_BYPASS  = 0x01,  // An encrypted SRTP packet; bypass any additional
+                           // crypto provided by the transport (e.g. DTLS)
+};
+
+// A TransportChannel represents one logical stream of packets that are sent
+// between the two sides of a session.
+// TODO(deadbeef): This interface currently represents the unity of an ICE
+// transport and a DTLS transport. They need to be separated apart.
+class TransportChannel : public rtc::PacketTransportInterface {
+ public:
+  TransportChannel(const std::string& transport_name, int component)
+      : transport_name_(transport_name),
+        component_(component),
+        writable_(false),
+        receiving_(false) {}
+  virtual ~TransportChannel() {}
+
+  // TODO(guoweis) - Make this pure virtual once all subclasses of
+  // TransportChannel have this defined.
+  virtual IceTransportState GetState() const {
+    return IceTransportState::STATE_CONNECTING;
+  }
+
+  const std::string& transport_name() const { return transport_name_; }
+  int component() const { return component_; }
+  const std::string debug_name() const override {
+    return transport_name() + " " + std::to_string(component());
+  }
+
+  // Returns the states of this channel.  Each time one of these states changes,
+  // a signal is raised.  These states are aggregated by the TransportManager.
+  bool writable() const override { return writable_; }
+  bool receiving() const override { return receiving_; }
+  DtlsTransportState dtls_state() const { return dtls_state_; }
+  // Emitted whenever DTLS-SRTP is setup which will require setting up a new
+  // SRTP context.
+  sigslot::signal2<TransportChannel*, DtlsTransportState> SignalDtlsState;
+
+  // Returns the current stats for this connection.
+  virtual bool GetStats(ConnectionInfos* infos) = 0;
+
+  // Is DTLS active?
+  virtual bool IsDtlsActive() const = 0;
+
+  // Default implementation.
+  virtual bool GetSslRole(rtc::SSLRole* role) const = 0;
+
+  // Sets up the ciphers to use for DTLS-SRTP. TODO(guoweis): Make this pure
+  // virtual once all dependencies have implementation.
+  virtual bool SetSrtpCryptoSuites(const std::vector<int>& ciphers);
+
+  // Keep the original one for backward compatibility until all dependencies
+  // move away. TODO(guoweis): Remove this function.
+  virtual bool SetSrtpCiphers(const std::vector<std::string>& ciphers);
+
+  // Finds out which DTLS-SRTP cipher was negotiated.
+  // TODO(guoweis): Remove this once all dependencies implement this.
+  virtual bool GetSrtpCryptoSuite(int* cipher) { return false; }
+
+  // Finds out which DTLS cipher was negotiated.
+  // TODO(guoweis): Remove this once all dependencies implement this.
+  virtual bool GetSslCipherSuite(int* cipher) { return false; }
+
+  // Gets the local RTCCertificate used for DTLS.
+  virtual rtc::scoped_refptr<rtc::RTCCertificate>
+  GetLocalCertificate() const = 0;
+
+  // Gets a copy of the remote side's SSL certificate.
+  virtual std::unique_ptr<rtc::SSLCertificate> GetRemoteSSLCertificate()
+      const = 0;
+
+  // Allows key material to be extracted for external encryption.
+  virtual bool ExportKeyingMaterial(const std::string& label,
+                                    const uint8_t* context,
+                                    size_t context_len,
+                                    bool use_context,
+                                    uint8_t* result,
+                                    size_t result_len) = 0;
+
+  // Deprecated by SignalSelectedCandidatePairChanged
+  // This signal occurs when there is a change in the way that packets are
+  // being routed, i.e. to a different remote location. The candidate
+  // indicates where and how we are currently sending media.
+  sigslot::signal2<TransportChannel*, const Candidate&> SignalRouteChange;
+
+  // Signalled when the current selected candidate pair has changed.
+  // The first parameter is the transport channel that signals the event.
+  // The second parameter is the new selected candidate pair. The third
+  // parameter is the last packet id sent on the previous candidate pair.
+  // The fourth parameter is a boolean which is true if the TransportChannel
+  // is ready to send with this candidate pair.
+  sigslot::signal4<TransportChannel*, CandidatePairInterface*, int, bool>
+      SignalSelectedCandidatePairChanged;
+
+  // Invoked when the channel is being destroyed.
+  sigslot::signal1<TransportChannel*> SignalDestroyed;
+
+  // Debugging description of this transport channel.
+  std::string ToString() const;
+
+ protected:
+  // Sets the writable state, signaling if necessary.
+  void set_writable(bool writable);
+
+  // Sets the receiving state, signaling if necessary.
+  void set_receiving(bool receiving);
+
+  // Sets the DTLS state, signaling if necessary.
+  void set_dtls_state(DtlsTransportState state);
+
+ private:
+  // Used mostly for debugging.
+  std::string transport_name_;
+  int component_;
+  bool writable_;
+  bool receiving_;
+  DtlsTransportState dtls_state_ = DTLS_TRANSPORT_NEW;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(TransportChannel);
+};
+
+}  // namespace cricket
+
+#endif  // WEBRTC_P2P_BASE_TRANSPORTCHANNEL_H_