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* 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.
#include <string>
#include <vector>
#include "webrtc/p2p/base/candidate.h"
#include "webrtc/p2p/base/transport.h"
#include "webrtc/p2p/base/transportdescription.h"
#include "webrtc/base/asyncpacketsocket.h"
#include "webrtc/base/basictypes.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"
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)
// Used to indicate channel's connection state.
enum TransportChannelState {
STATE_CONNECTING, // Will enter this state once a connection is created
// A TransportChannel represents one logical stream of packets that are sent
// between the two sides of a session.
class TransportChannel : public sigslot::has_slots<> {
explicit TransportChannel(const std::string& transport_name, int component)
: transport_name_(transport_name),
receiving_(false) {}
virtual ~TransportChannel() {}
// TODO(guoweis) - Make this pure virtual once all subclasses of
// TransportChannel have this defined.
virtual TransportChannelState GetState() const {
return TransportChannelState::STATE_CONNECTING;
// TODO(mallinath) - Remove this API, as it's no longer useful.
// Returns the session id of this channel.
virtual const std::string SessionId() const { return std::string(); }
const std::string& transport_name() const { return transport_name_; }
int component() const { return 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 { return writable_; }
bool receiving() const { return receiving_; }
sigslot::signal1<TransportChannel*> SignalWritableState;
// Emitted when the TransportChannel's ability to send has changed.
sigslot::signal1<TransportChannel*> SignalReadyToSend;
sigslot::signal1<TransportChannel*> SignalReceivingState;
// Attempts to send the given packet. The return value is < 0 on failure.
// TODO: Remove the default argument once channel code is updated.
virtual int SendPacket(const char* data, size_t len,
const rtc::PacketOptions& options,
int flags = 0) = 0;
// Sets a socket option on this channel. Note that not all options are
// supported by all transport types.
virtual int SetOption(rtc::Socket::Option opt, int value) = 0;
// TODO(pthatcher): Once Chrome's MockTransportChannel implments
// this, remove the default implementation.
virtual bool GetOption(rtc::Socket::Option opt, int* value) { return false; }
// Returns the most recent error that occurred on this channel.
virtual int GetError() = 0;
// 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.
virtual bool SetSrtpCiphers(const std::vector<std::string>& ciphers) = 0;
// Finds out which DTLS-SRTP cipher was negotiated.
// TODO(guoweis): Remove this once all dependencies implement this.
virtual bool GetSrtpCryptoSuite(std::string* cipher) {
return false;
// Finds out which DTLS cipher was negotiated.
// TODO(guoweis): Remove this once all dependencies implement this.
virtual bool GetSslCipherSuite(uint16_t* 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, owned by the caller.
virtual bool GetRemoteSSLCertificate(rtc::SSLCertificate** cert) const = 0;
// Allows key material to be extracted for external encryption.
virtual bool ExportKeyingMaterial(const std::string& label,
const uint8* context,
size_t context_len,
bool use_context,
uint8* result,
size_t result_len) = 0;
// Signalled each time a packet is received on this channel.
sigslot::signal5<TransportChannel*, const char*,
size_t, const rtc::PacketTime&, int> SignalReadPacket;
// 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;
// Invoked when the channel is being destroyed.
sigslot::signal1<TransportChannel*> SignalDestroyed;
// Debugging description of this transport channel.
std::string ToString() const;
// TODO(honghaiz): Remove this once chromium's unit tests no longer call it.
void set_readable(bool readable) { set_receiving(readable); }
// Sets the writable state, signaling if necessary.
void set_writable(bool writable);
// Sets the receiving state, signaling if necessary.
void set_receiving(bool receiving);
// Used mostly for debugging.
std::string transport_name_;
int component_;
bool writable_;
bool receiving_;
} // namespace cricket