/usr/include/libktorrent/utp/connection.h is in libktorrent-dev 1.3.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2009 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#ifndef UTP_CONNECTION_H
#define UTP_CONNECTION_H
#include <QPair>
#include <QMutex>
#include <QWaitCondition>
#include <QBasicTimer>
#include <QSharedPointer>
#include <ktorrent_export.h>
#include <net/address.h>
#include <utp/utpprotocol.h>
#include <util/circularbuffer.h>
#include <util/timer.h>
#include <utp/remotewindow.h>
#include <boost/concept_check.hpp>
namespace utp
{
class DelayWindow;
class LocalWindow;
class Transmitter;
/**
Keeps track of a single UTP connection
*/
class KTORRENT_EXPORT Connection : public QObject, public Retransmitter
{
Q_OBJECT
public:
enum Type
{
INCOMING,
OUTGOING
};
/// Thrown when a transmission error occurs, server should kill the connection if it happens
class TransmissionError
{
public:
TransmissionError(const char* file, int line);
QString location;
};
struct Stats
{
Type type;
net::Address remote;
ConnectionState state;
bt::Uint16 send_connection_id;
bt::Uint32 reply_micro;
bt::Uint16 recv_connection_id;
bt::Uint16 seq_nr;
int eof_seq_nr;
bt::Uint32 timeout;
TimeValue absolute_timeout;
int rtt;
int rtt_var;
bt::Uint32 packet_size;
bt::Uint32 last_window_size_transmitted;
bt::Uint64 bytes_received;
bt::Uint64 bytes_sent;
bt::Uint32 packets_received;
bt::Uint32 packets_sent;
bt::Uint64 bytes_lost;
bt::Uint32 packets_lost;
bool readable;
bool writeable;
};
Connection(bt::Uint16 recv_connection_id, Type type, const net::Address & remote, Transmitter* transmitter);
virtual ~Connection();
/// Turn on or off blocking mode
void setBlocking(bool on) {blocking = on;}
/// Dump connection stats
void dumpStats();
/// Start connecting (OUTGOING only)
void startConnecting();
/// Get the connection stats
const Stats & connectionStats() const {return stats;}
/// Handle a single packet
ConnectionState handlePacket(const PacketParser & parser, bt::Buffer::Ptr packet);
/// Get the remote address
const net::Address & remoteAddress() const {return stats.remote;}
/// Get the receive connection id
bt::Uint16 receiveConnectionID() const {return stats.recv_connection_id;}
/// Send some data, returns the amount of bytes sent (or -1 on error)
int send(const bt::Uint8* data, bt::Uint32 len);
/// Read available data from local window, returns the amount of bytes read
int recv(bt::Uint8* buf, bt::Uint32 max_len);
/// Get the connection state
ConnectionState connectionState() const {return stats.state;}
/// Get the type of connection
Type connectionType() const {return stats.type;}
/// Get the number of bytes available
bt::Uint32 bytesAvailable() const;
/// Can we write to this socket
bool isWriteable() const;
/// Wait until the connectTo call fails or succeeds
bool waitUntilConnected();
/// Wait until there is data ready or the socket is closed or a timeout occurs
bool waitForData(bt::Uint32 timeout = 0);
/// Close the socket
void close();
/// Reset the connection
void reset();
/// Update the RTT time
virtual void updateRTT(const Header* hdr, bt::Uint32 packet_rtt, bt::Uint32 packet_size);
/// Retransmit a packet
virtual void retransmit(PacketBuffer & packet, bt::Uint16 p_seq_nr);
/// Is all data sent
bool allDataSent() const;
/// Get the current timeout
virtual bt::Uint32 currentTimeout() const {return stats.timeout;}
typedef QSharedPointer<Connection> Ptr;
typedef QWeakPointer<Connection> WPtr;
/// Set a weak pointer to self
void setWeakPointer(WPtr ptr) {self = ptr;}
/// Check if we haven't hit a timeout yet
void checkTimeout(const TimeValue & now);
private:
void sendSYN();
void sendState();
void sendFIN();
void sendReset();
void updateDelayMeasurement(const Header* hdr);
void sendStateOrData();
void sendPackets();
void sendPacket(bt::Uint32 type, bt::Uint16 p_ack_nr);
void checkIfClosed();
void sendDataPacket(PacketBuffer & packet, bt::Uint16 seq_nr, const TimeValue & now);
void startTimer();
void checkState();
bt::Uint32 extensionLength() const;
void handleTimeout();
private:
Transmitter* transmitter;
LocalWindow* local_wnd;
RemoteWindow* remote_wnd;
bt::CircularBuffer output_buffer;
//bt::Timer timer;
mutable QMutex mutex;
QWaitCondition connected;
QWaitCondition data_ready;
Stats stats;
bool fin_sent;
TimeValue last_packet_sent;
DelayWindow* delay_window;
Connection::WPtr self;
bool blocking;
friend class UTPServer;
};
/**
Interface class for transmitting packets and notifying if a connection becomes readable or writeable
*/
class KTORRENT_EXPORT Transmitter
{
public:
virtual ~Transmitter();
/// Send a packet of a connection
virtual bool sendTo(Connection::Ptr conn, const PacketBuffer & packet) = 0;
/// Connection has become readable, writeable or both
virtual void stateChanged(Connection::Ptr conn, bool readable, bool writeable) = 0;
/// Called when the connection is closed
virtual void closed(Connection::Ptr conn) = 0;
};
}
#endif // UTP_CONNECTION_H
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