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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* 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
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#ifndef _D_PEER_CONNECTION_H_
#define _D_PEER_CONNECTION_H_
#include "common.h"
#include "SharedHandle.h"
#include <unistd.h>
namespace aria2 {
class Option;
class Logger;
class SocketCore;
class ARC4Encryptor;
class ARC4Decryptor;
// we assume maximum length of incoming message is "piece" message with 16KB
// data. Messages beyond that size are dropped.
#define MAX_PAYLOAD_LEN (9+16*1024)
class PeerConnection {
private:
int32_t cuid;
SharedHandle<SocketCore> socket;
const Option* option;
const Logger* logger;
unsigned char resbuf[MAX_PAYLOAD_LEN];
size_t resbufLength;
size_t currentPayloadLength;
unsigned char lenbuf[4];
size_t lenbufLength;
bool _encryptionEnabled;
SharedHandle<ARC4Encryptor> _encryptor;
SharedHandle<ARC4Decryptor> _decryptor;
void readData(unsigned char* data, size_t& length, bool encryption);
void sendData(const unsigned char* data, size_t length, bool encryption);
public:
PeerConnection(int32_t cuid, const SharedHandle<SocketCore>& socket, const Option* op);
~PeerConnection();
// Returns the number of bytes written
ssize_t sendMessage(const unsigned char* data, size_t dataLength);
bool receiveMessage(unsigned char* data, size_t& dataLength);
/**
* Returns true if a handshake message is fully received, otherwise returns
* false.
* In both cases, 'msg' is filled with received bytes and the filled length
* is assigned to 'length'.
*/
bool receiveHandshake(unsigned char* data, size_t& dataLength, bool peek = false);
void enableEncryption(const SharedHandle<ARC4Encryptor>& encryptor,
const SharedHandle<ARC4Decryptor>& decryptor);
void presetBuffer(const unsigned char* data, size_t length);
};
typedef SharedHandle<PeerConnection> PeerConnectionHandle;
typedef WeakHandle<PeerConnection> PeerConnectionWeakHandle;
} // namespace aria2
#endif // _D_PEER_CONNECTION_H_
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