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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.
*/
#ifndef P2P_BASE_TCP_PORT_H_
#define P2P_BASE_TCP_PORT_H_
#include <list>
#include <memory>
#include <string>
#include "absl/memory/memory.h"
#include "absl/strings/string_view.h"
#include "api/task_queue/pending_task_safety_flag.h"
#include "p2p/base/connection.h"
#include "p2p/base/port.h"
#include "rtc_base/async_packet_socket.h"
#include "rtc_base/containers/flat_map.h"
namespace cricket {
class TCPConnection;
// Communicates using a local TCP port.
//
// This class is designed to allow subclasses to take advantage of the
// connection management provided by this class. A subclass should take of all
// packet sending and preparation, but when a packet is received, it should
// call this TCPPort::OnReadPacket (3 arg) to dispatch to a connection.
class TCPPort : public Port {
public:
static std::unique_ptr<TCPPort> Create(
rtc::Thread* thread,
rtc::PacketSocketFactory* factory,
const rtc::Network* network,
uint16_t min_port,
uint16_t max_port,
absl::string_view username,
absl::string_view password,
bool allow_listen,
const webrtc::FieldTrialsView* field_trials = nullptr) {
// Using `new` to access a non-public constructor.
return absl::WrapUnique(new TCPPort(thread, factory, network, min_port,
max_port, username, password,
allow_listen, field_trials));
}
~TCPPort() override;
Connection* CreateConnection(const Candidate& address,
CandidateOrigin origin) override;
void PrepareAddress() override;
// Options apply to accepted sockets.
// TODO(bugs.webrtc.org/13065): Apply also to outgoing and existing
// connections.
int GetOption(rtc::Socket::Option opt, int* value) override;
int SetOption(rtc::Socket::Option opt, int value) override;
int GetError() override;
bool SupportsProtocol(absl::string_view protocol) const override;
ProtocolType GetProtocol() const override;
protected:
TCPPort(rtc::Thread* thread,
rtc::PacketSocketFactory* factory,
const rtc::Network* network,
uint16_t min_port,
uint16_t max_port,
absl::string_view username,
absl::string_view password,
bool allow_listen,
const webrtc::FieldTrialsView* field_trials);
// Handles sending using the local TCP socket.
int SendTo(const void* data,
size_t size,
const rtc::SocketAddress& addr,
const rtc::PacketOptions& options,
bool payload) override;
// Accepts incoming TCP connection.
void OnNewConnection(rtc::AsyncListenSocket* socket,
rtc::AsyncPacketSocket* new_socket);
private:
struct Incoming {
rtc::SocketAddress addr;
rtc::AsyncPacketSocket* socket;
};
void TryCreateServerSocket();
rtc::AsyncPacketSocket* GetIncoming(const rtc::SocketAddress& addr,
bool remove = false);
// Receives packet signal from the local TCP Socket.
void OnReadPacket(rtc::AsyncPacketSocket* socket,
const char* data,
size_t size,
const rtc::SocketAddress& remote_addr,
const int64_t& packet_time_us);
void OnSentPacket(rtc::AsyncPacketSocket* socket,
const rtc::SentPacket& sent_packet) override;
void OnReadyToSend(rtc::AsyncPacketSocket* socket);
bool allow_listen_;
std::unique_ptr<rtc::AsyncListenSocket> listen_socket_;
// Options to be applied to accepted sockets.
// TODO(bugs.webrtc:13065): Configure connect/accept in the same way, but
// currently, setting OPT_NODELAY for client sockets is done (unconditionally)
// by BasicPacketSocketFactory::CreateClientTcpSocket.
webrtc::flat_map<rtc::Socket::Option, int> socket_options_;
int error_;
std::list<Incoming> incoming_;
friend class TCPConnection;
};
class TCPConnection : public Connection, public sigslot::has_slots<> {
public:
// Connection is outgoing unless socket is specified
TCPConnection(rtc::WeakPtr<Port> tcp_port,
const Candidate& candidate,
rtc::AsyncPacketSocket* socket = nullptr);
~TCPConnection() override;
int Send(const void* data,
size_t size,
const rtc::PacketOptions& options) override;
int GetError() override;
rtc::AsyncPacketSocket* socket() { return socket_.get(); }
// Allow test cases to overwrite the default timeout period.
int reconnection_timeout() const { return reconnection_timeout_; }
void set_reconnection_timeout(int timeout_in_ms) {
reconnection_timeout_ = timeout_in_ms;
}
protected:
// Set waiting_for_stun_binding_complete_ to false to allow data packets in
// addition to what Port::OnConnectionRequestResponse does.
void OnConnectionRequestResponse(StunRequest* req,
StunMessage* response) override;
private:
// Helper function to handle the case when Ping or Send fails with error
// related to socket close.
void MaybeReconnect();
void CreateOutgoingTcpSocket();
void ConnectSocketSignals(rtc::AsyncPacketSocket* socket);
void OnConnect(rtc::AsyncPacketSocket* socket);
void OnClose(rtc::AsyncPacketSocket* socket, int error);
void OnReadPacket(rtc::AsyncPacketSocket* socket,
const char* data,
size_t size,
const rtc::SocketAddress& remote_addr,
const int64_t& packet_time_us);
void OnReadyToSend(rtc::AsyncPacketSocket* socket);
TCPPort* tcp_port() {
RTC_DCHECK_EQ(port()->GetProtocol(), PROTO_TCP);
return static_cast<TCPPort*>(port());
}
std::unique_ptr<rtc::AsyncPacketSocket> socket_;
int error_;
bool outgoing_;
// Guard against multiple outgoing tcp connection during a reconnect.
bool connection_pending_;
// Guard against data packets sent when we reconnect a TCP connection. During
// reconnecting, when a new tcp connection has being made, we can't send data
// packets out until the STUN binding is completed (i.e. the write state is
// set to WRITABLE again by Connection::OnConnectionRequestResponse). IPC
// socket, when receiving data packets before that, will trigger OnError which
// will terminate the newly created connection.
bool pretending_to_be_writable_;
// Allow test case to overwrite the default timeout period.
int reconnection_timeout_;
webrtc::ScopedTaskSafety network_safety_;
friend class TCPPort;
};
} // namespace cricket
#endif // P2P_BASE_TCP_PORT_H_
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