342 lines
13 KiB
C
342 lines
13 KiB
C
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/*
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* Copyright 2004 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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// P2PTransportChannel wraps up the state management of the connection between
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// two P2P clients. Clients have candidate ports for connecting, and
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// connections which are combinations of candidates from each end (Alice and
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// Bob each have candidates, one candidate from Alice and one candidate from
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// Bob are used to make a connection, repeat to make many connections).
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//
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// When all of the available connections become invalid (non-writable), we
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// kick off a process of determining more candidates and more connections.
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//
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#ifndef WEBRTC_P2P_BASE_P2PTRANSPORTCHANNEL_H_
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#define WEBRTC_P2P_BASE_P2PTRANSPORTCHANNEL_H_
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#include <map>
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#include <memory>
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#include <set>
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#include <string>
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#include <vector>
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/p2p/base/candidate.h"
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#include "webrtc/p2p/base/candidatepairinterface.h"
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#include "webrtc/p2p/base/p2ptransport.h"
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#include "webrtc/p2p/base/portallocator.h"
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#include "webrtc/p2p/base/portinterface.h"
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#include "webrtc/p2p/base/transportchannelimpl.h"
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#include "webrtc/base/asyncpacketsocket.h"
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#include "webrtc/base/sigslot.h"
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namespace cricket {
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extern const int WEAK_PING_INTERVAL;
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static const int MIN_PINGS_AT_WEAK_PING_INTERVAL = 3;
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struct IceParameters {
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std::string ufrag;
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std::string pwd;
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IceParameters(const std::string& ice_ufrag, const std::string& ice_pwd)
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: ufrag(ice_ufrag), pwd(ice_pwd) {}
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bool operator==(const IceParameters& other) {
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return ufrag == other.ufrag && pwd == other.pwd;
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}
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bool operator!=(const IceParameters& other) { return !(*this == other); }
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};
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// Adds the port on which the candidate originated.
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class RemoteCandidate : public Candidate {
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public:
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RemoteCandidate(const Candidate& c, PortInterface* origin_port)
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: Candidate(c), origin_port_(origin_port) {}
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PortInterface* origin_port() { return origin_port_; }
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private:
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PortInterface* origin_port_;
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};
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// P2PTransportChannel manages the candidates and connection process to keep
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// two P2P clients connected to each other.
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class P2PTransportChannel : public TransportChannelImpl,
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public rtc::MessageHandler {
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public:
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P2PTransportChannel(const std::string& transport_name,
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int component,
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PortAllocator* allocator);
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// TODO(mikescarlett): Deprecated. Remove when Chromium's
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// IceTransportChannel does not depend on this.
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P2PTransportChannel(const std::string& transport_name,
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int component,
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P2PTransport* transport,
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PortAllocator* allocator);
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virtual ~P2PTransportChannel();
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// From TransportChannelImpl:
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TransportChannelState GetState() const override;
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void SetIceRole(IceRole role) override;
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IceRole GetIceRole() const override { return ice_role_; }
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void SetIceTiebreaker(uint64_t tiebreaker) override;
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void SetIceCredentials(const std::string& ice_ufrag,
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const std::string& ice_pwd) override;
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void SetRemoteIceCredentials(const std::string& ice_ufrag,
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const std::string& ice_pwd) override;
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void SetRemoteIceMode(IceMode mode) override;
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void Connect() override;
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void MaybeStartGathering() override;
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IceGatheringState gathering_state() const override {
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return gathering_state_;
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}
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void AddRemoteCandidate(const Candidate& candidate) override;
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void RemoveRemoteCandidate(const Candidate& candidate) override;
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// Sets the parameters in IceConfig. We do not set them blindly. Instead, we
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// only update the parameter if it is considered set in |config|. For example,
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// a negative value of receiving_timeout will be considered "not set" and we
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// will not use it to update the respective parameter in |config_|.
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void SetIceConfig(const IceConfig& config) override;
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const IceConfig& config() const;
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// From TransportChannel:
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int SendPacket(const char* data,
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size_t len,
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const rtc::PacketOptions& options,
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int flags) override;
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int SetOption(rtc::Socket::Option opt, int value) override;
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bool GetOption(rtc::Socket::Option opt, int* value) override;
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int GetError() override { return error_; }
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bool GetStats(std::vector<ConnectionInfo>* stats) override;
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const Connection* best_connection() const { return best_connection_; }
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void set_incoming_only(bool value) { incoming_only_ = value; }
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// Note: This is only for testing purpose.
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// |ports_| should not be changed from outside.
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const std::vector<PortInterface*>& ports() { return ports_; }
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IceMode remote_ice_mode() const { return remote_ice_mode_; }
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// DTLS methods.
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bool IsDtlsActive() const override { return false; }
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// Default implementation.
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bool GetSslRole(rtc::SSLRole* role) const override { return false; }
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bool SetSslRole(rtc::SSLRole role) override { return false; }
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// Set up the ciphers to use for DTLS-SRTP.
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bool SetSrtpCryptoSuites(const std::vector<int>& ciphers) override {
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return false;
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}
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// Find out which DTLS-SRTP cipher was negotiated.
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bool GetSrtpCryptoSuite(int* cipher) override { return false; }
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// Find out which DTLS cipher was negotiated.
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bool GetSslCipherSuite(int* cipher) override { return false; }
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// Returns null because the channel is not encrypted by default.
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rtc::scoped_refptr<rtc::RTCCertificate> GetLocalCertificate() const override {
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return nullptr;
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}
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std::unique_ptr<rtc::SSLCertificate> GetRemoteSSLCertificate()
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const override {
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return nullptr;
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}
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// Allows key material to be extracted for external encryption.
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bool ExportKeyingMaterial(const std::string& label,
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const uint8_t* context,
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size_t context_len,
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bool use_context,
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uint8_t* result,
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size_t result_len) override {
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return false;
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}
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bool SetLocalCertificate(
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const rtc::scoped_refptr<rtc::RTCCertificate>& certificate) override {
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return false;
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}
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// Set DTLS Remote fingerprint. Must be after local identity set.
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bool SetRemoteFingerprint(const std::string& digest_alg,
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const uint8_t* digest,
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size_t digest_len) override {
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return false;
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}
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int receiving_timeout() const { return config_.receiving_timeout; }
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int check_receiving_interval() const { return check_receiving_interval_; }
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// Helper method used only in unittest.
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rtc::DiffServCodePoint DefaultDscpValue() const;
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// Public for unit tests.
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Connection* FindNextPingableConnection();
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void MarkConnectionPinged(Connection* conn);
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// Public for unit tests.
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const std::vector<Connection*>& connections() const { return connections_; }
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// Public for unit tests.
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PortAllocatorSession* allocator_session() {
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return allocator_sessions_.back().get();
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}
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// Public for unit tests.
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const std::vector<RemoteCandidate>& remote_candidates() const {
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return remote_candidates_;
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}
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private:
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rtc::Thread* thread() { return worker_thread_; }
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bool IsGettingPorts() { return allocator_session()->IsGettingPorts(); }
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// A transport channel is weak if the current best connection is either
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// not receiving or not writable, or if there is no best connection at all.
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bool weak() const;
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void UpdateConnectionStates();
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void RequestSort();
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void SortConnections();
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void SwitchBestConnectionTo(Connection* conn);
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void UpdateState();
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void HandleAllTimedOut();
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void MaybeStopPortAllocatorSessions();
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TransportChannelState ComputeState() const;
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Connection* GetBestConnectionOnNetwork(rtc::Network* network) const;
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bool CreateConnections(const Candidate& remote_candidate,
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PortInterface* origin_port);
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bool CreateConnection(PortInterface* port,
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const Candidate& remote_candidate,
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PortInterface* origin_port);
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bool FindConnection(cricket::Connection* connection) const;
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uint32_t GetRemoteCandidateGeneration(const Candidate& candidate);
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bool IsDuplicateRemoteCandidate(const Candidate& candidate);
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void RememberRemoteCandidate(const Candidate& remote_candidate,
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PortInterface* origin_port);
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bool IsPingable(Connection* conn, int64_t now);
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void PingConnection(Connection* conn);
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void AddAllocatorSession(std::unique_ptr<PortAllocatorSession> session);
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void AddConnection(Connection* connection);
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void OnPortReady(PortAllocatorSession *session, PortInterface* port);
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void OnCandidatesReady(PortAllocatorSession *session,
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const std::vector<Candidate>& candidates);
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void OnCandidatesAllocationDone(PortAllocatorSession* session);
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void OnUnknownAddress(PortInterface* port,
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const rtc::SocketAddress& addr,
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ProtocolType proto,
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IceMessage* stun_msg,
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const std::string& remote_username,
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bool port_muxed);
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void OnPortDestroyed(PortInterface* port);
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void OnPortNetworkInactive(PortInterface* port);
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void OnRoleConflict(PortInterface* port);
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void OnConnectionStateChange(Connection* connection);
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void OnReadPacket(Connection *connection, const char *data, size_t len,
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const rtc::PacketTime& packet_time);
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void OnSentPacket(const rtc::SentPacket& sent_packet);
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void OnReadyToSend(Connection* connection);
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void OnConnectionDestroyed(Connection *connection);
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void OnNominated(Connection* conn);
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void OnMessage(rtc::Message* pmsg) override;
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void OnSort();
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void OnCheckAndPing();
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void PruneConnections();
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Connection* best_nominated_connection() const;
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bool IsBackupConnection(Connection* conn) const;
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Connection* FindConnectionToPing(int64_t now);
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Connection* FindOldestConnectionNeedingTriggeredCheck(int64_t now);
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// Between |conn1| and |conn2|, this function returns the one which should
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// be pinged first.
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Connection* SelectMostPingableConnection(Connection* conn1,
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Connection* conn2);
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// Select the connection which is Relay/Relay. If both of them are,
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// UDP relay protocol takes precedence.
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Connection* MostLikelyToWork(Connection* conn1, Connection* conn2);
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// Compare the last_ping_sent time and return the one least recently pinged.
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Connection* LeastRecentlyPinged(Connection* conn1, Connection* conn2);
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// Returns the latest remote ICE parameters or nullptr if there are no remote
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// ICE parameters yet.
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IceParameters* remote_ice() {
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return remote_ice_parameters_.empty() ? nullptr
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: &remote_ice_parameters_.back();
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}
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// Returns the remote IceParameters and generation that match |ufrag|
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// if found, and returns nullptr otherwise.
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const IceParameters* FindRemoteIceFromUfrag(const std::string& ufrag,
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uint32_t* generation);
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// Returns the index of the latest remote ICE parameters, or 0 if no remote
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// ICE parameters have been received.
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uint32_t remote_ice_generation() {
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return remote_ice_parameters_.empty()
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? 0
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: static_cast<uint32_t>(remote_ice_parameters_.size() - 1);
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}
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PortAllocator* allocator_;
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rtc::Thread* worker_thread_;
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bool incoming_only_;
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int error_;
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std::vector<std::unique_ptr<PortAllocatorSession>> allocator_sessions_;
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std::vector<PortInterface *> ports_;
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// |connections_| is a sorted list with the first one always be the
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// |best_connection_| when it's not nullptr. The combination of
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// |pinged_connections_| and |unpinged_connections_| has the same
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// connections as |connections_|. These 2 sets maintain whether a
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// connection should be pinged next or not.
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std::vector<Connection *> connections_;
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std::set<Connection*> pinged_connections_;
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std::set<Connection*> unpinged_connections_;
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Connection* best_connection_;
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// Connection selected by the controlling agent. This should be used only
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// at controlled side when protocol type is RFC5245.
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Connection* pending_best_connection_;
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std::vector<RemoteCandidate> remote_candidates_;
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bool sort_dirty_; // indicates whether another sort is needed right now
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bool had_connection_ = false; // if connections_ has ever been nonempty
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typedef std::map<rtc::Socket::Option, int> OptionMap;
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OptionMap options_;
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std::string ice_ufrag_;
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std::string ice_pwd_;
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std::vector<IceParameters> remote_ice_parameters_;
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IceMode remote_ice_mode_;
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IceRole ice_role_;
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uint64_t tiebreaker_;
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IceGatheringState gathering_state_;
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int check_receiving_interval_;
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int64_t last_ping_sent_ms_ = 0;
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int weak_ping_interval_ = WEAK_PING_INTERVAL;
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TransportChannelState state_ = TransportChannelState::STATE_INIT;
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IceConfig config_;
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int last_sent_packet_id_ = -1; // -1 indicates no packet was sent before.
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RTC_DISALLOW_COPY_AND_ASSIGN(P2PTransportChannel);
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};
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} // namespace cricket
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#endif // WEBRTC_P2P_BASE_P2PTRANSPORTCHANNEL_H_
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