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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 <unistd.h>
#include "SharedHandle.h"
#include "SocketBuffer.h"
#include "Command.h"
namespace aria2 {
class Logger;
class SocketCore;
class ARC4Encryptor;
class ARC4Decryptor;
// The maximum length of payload. Messages beyond that length are
// dropped.
#define MAX_PAYLOAD_LEN (16*1024+128)
class PeerConnection {
private:
cuid_t cuid_;
SharedHandle<SocketCore> socket_;
Logger* logger_;
unsigned char* resbuf_;
size_t resbufLength_;
size_t currentPayloadLength_;
unsigned char lenbuf_[4];
size_t lenbufLength_;
SocketBuffer socketBuffer_;
bool encryptionEnabled_;
SharedHandle<ARC4Encryptor> encryptor_;
SharedHandle<ARC4Decryptor> decryptor_;
bool prevPeek_;
void readData(unsigned char* data, size_t& length, bool encryption);
ssize_t sendData(const unsigned char* data, size_t length, bool encryption);
public:
PeerConnection(cuid_t cuid, const SharedHandle<SocketCore>& socket);
~PeerConnection();
// Pushes data into send buffer. After this call, this object gets
// ownership of data, so caller must not delete or alter it.
void pushBytes(unsigned char* data, size_t len);
void pushStr(const std::string& data);
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);
bool sendBufferIsEmpty() const;
ssize_t sendPendingData();
const unsigned char* getBuffer() const
{
return resbuf_;
}
unsigned char* detachBuffer()
{
unsigned char* detachbuf = resbuf_;
resbuf_ = new unsigned char[MAX_PAYLOAD_LEN];
return detachbuf;
}
};
typedef SharedHandle<PeerConnection> PeerConnectionHandle;
typedef WeakHandle<PeerConnection> PeerConnectionWeakHandle;
} // namespace aria2
#endif // _D_PEER_CONNECTION_H_
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