28100cb388
BUG=N/A TBR=niklas.enbom@webrtc.org Review URL: https://webrtc-codereview.appspot.com/29829004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7472 4adac7df-926f-26a2-2b94-8c16560cd09d
260 lines
9.5 KiB
C++
260 lines
9.5 KiB
C++
/*
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* libjingle
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* Copyright 2004--2005, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 TALK_P2P_BASE_P2PTRANSPORTCHANNEL_H_
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#define TALK_P2P_BASE_P2PTRANSPORTCHANNEL_H_
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#include <map>
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#include <string>
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#include <vector>
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#include "talk/p2p/base/candidate.h"
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#include "talk/p2p/base/p2ptransport.h"
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#include "talk/p2p/base/portallocator.h"
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#include "talk/p2p/base/portinterface.h"
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#include "talk/p2p/base/transport.h"
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#include "talk/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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// 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& content_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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virtual Transport* GetTransport() { return transport_; }
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virtual void SetIceRole(IceRole role);
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virtual IceRole GetIceRole() const { return ice_role_; }
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virtual void SetIceTiebreaker(uint64 tiebreaker);
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virtual size_t GetConnectionCount() const { return connections_.size(); }
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virtual bool GetIceProtocolType(IceProtocolType* type) const;
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virtual void SetIceProtocolType(IceProtocolType type);
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virtual void SetIceCredentials(const std::string& ice_ufrag,
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const std::string& ice_pwd);
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virtual void SetRemoteIceCredentials(const std::string& ice_ufrag,
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const std::string& ice_pwd);
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virtual void SetRemoteIceMode(IceMode mode);
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virtual void Connect();
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virtual void Reset();
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virtual void OnSignalingReady();
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virtual void OnCandidate(const Candidate& candidate);
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// From TransportChannel:
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virtual int SendPacket(const char *data, size_t len,
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const rtc::PacketOptions& options, int flags);
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virtual int SetOption(rtc::Socket::Option opt, int value);
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virtual int GetError() { return error_; }
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virtual bool GetStats(std::vector<ConnectionInfo>* stats);
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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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virtual bool IsDtlsActive() const { return false; }
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// Default implementation.
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virtual bool GetSslRole(rtc::SSLRole* role) const {
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return false;
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}
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virtual bool SetSslRole(rtc::SSLRole role) {
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return false;
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}
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// Set up the ciphers to use for DTLS-SRTP.
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virtual bool SetSrtpCiphers(const std::vector<std::string>& ciphers) {
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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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virtual bool GetSrtpCipher(std::string* cipher) {
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return false;
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}
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// Returns false because the channel is not encrypted by default.
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virtual bool GetLocalIdentity(rtc::SSLIdentity** identity) const {
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return false;
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}
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virtual bool GetRemoteCertificate(rtc::SSLCertificate** cert) const {
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return false;
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}
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// Allows key material to be extracted for external encryption.
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virtual bool ExportKeyingMaterial(
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const std::string& label,
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const uint8* context,
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size_t context_len,
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bool use_context,
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uint8* result,
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size_t result_len) {
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return false;
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}
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virtual bool SetLocalIdentity(rtc::SSLIdentity* identity) {
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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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virtual bool SetRemoteFingerprint(
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const std::string& digest_alg,
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const uint8* digest,
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size_t digest_len) {
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return false;
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}
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// Helper method used only in unittest.
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rtc::DiffServCodePoint DefaultDscpValue() const;
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private:
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rtc::Thread* thread() { return worker_thread_; }
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PortAllocatorSession* allocator_session() {
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return allocator_sessions_.back();
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}
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void Allocate();
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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 UpdateChannelState();
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void HandleWritable();
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void HandleNotWritable();
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void HandleAllTimedOut();
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Connection* GetBestConnectionOnNetwork(rtc::Network* network);
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bool CreateConnections(const Candidate &remote_candidate,
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PortInterface* origin_port, bool readable);
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bool CreateConnection(PortInterface* port, const Candidate& remote_candidate,
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PortInterface* origin_port, bool readable);
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bool FindConnection(cricket::Connection* connection) const;
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uint32 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);
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Connection* FindNextPingableConnection();
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void PingConnection(Connection* conn);
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void AddAllocatorSession(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 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 OnReadyToSend(Connection* connection);
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void OnConnectionDestroyed(Connection *connection);
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void OnUseCandidate(Connection* conn);
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virtual void OnMessage(rtc::Message *pmsg);
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void OnSort();
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void OnPing();
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P2PTransport* transport_;
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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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bool waiting_for_signaling_;
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int error_;
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std::vector<PortAllocatorSession*> allocator_sessions_;
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std::vector<PortInterface *> ports_;
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std::vector<Connection *> 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 was_writable_;
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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::string remote_ice_ufrag_;
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std::string remote_ice_pwd_;
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IceProtocolType protocol_type_;
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IceMode remote_ice_mode_;
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IceRole ice_role_;
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uint64 tiebreaker_;
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uint32 remote_candidate_generation_;
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DISALLOW_EVIL_CONSTRUCTORS(P2PTransportChannel);
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};
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} // namespace cricket
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#endif // TALK_P2P_BASE_P2PTRANSPORTCHANNEL_H_
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