mirror of https://github.com/aria2/aria2
143 lines
4.0 KiB
C++
143 lines
4.0 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#ifndef D_PEER_CONNECTION_H
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#define D_PEER_CONNECTION_H
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#include "common.h"
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#include <unistd.h>
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#include "SharedHandle.h"
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#include "SocketBuffer.h"
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#include "Command.h"
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namespace aria2 {
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class Peer;
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class SocketCore;
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class ARC4Encryptor;
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// The maximum length of payload. Messages beyond that length are
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// dropped.
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#define MAX_PAYLOAD_LEN (16*1024+128)
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class PeerConnection {
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private:
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cuid_t cuid_;
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SharedHandle<Peer> peer_;
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SharedHandle<SocketCore> socket_;
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// Maximum payload length
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size_t maxPayloadLength_;
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unsigned char* resbuf_;
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size_t resbufLength_;
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size_t currentPayloadLength_;
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unsigned char lenbuf_[4];
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size_t lenbufLength_;
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SocketBuffer socketBuffer_;
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bool encryptionEnabled_;
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SharedHandle<ARC4Encryptor> encryptor_;
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SharedHandle<ARC4Encryptor> decryptor_;
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bool prevPeek_;
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void readData(unsigned char* data, size_t& length, bool encryption);
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ssize_t sendData(const unsigned char* data, size_t length, bool encryption);
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public:
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PeerConnection
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(cuid_t cuid,
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const SharedHandle<Peer>& peer,
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const SharedHandle<SocketCore>& socket);
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~PeerConnection();
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// Pushes data into send buffer. After this call, this object gets
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// ownership of data, so caller must not delete or alter it.
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void pushBytes(unsigned char* data, size_t len);
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void pushStr(const std::string& data);
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bool receiveMessage(unsigned char* data, size_t& dataLength);
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/**
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* Returns true if a handshake message is fully received, otherwise returns
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* false.
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* In both cases, 'msg' is filled with received bytes and the filled length
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* is assigned to 'length'.
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*/
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bool receiveHandshake
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(unsigned char* data, size_t& dataLength, bool peek = false);
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void enableEncryption(const SharedHandle<ARC4Encryptor>& encryptor,
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const SharedHandle<ARC4Encryptor>& decryptor);
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void presetBuffer(const unsigned char* data, size_t length);
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bool sendBufferIsEmpty() const;
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ssize_t sendPendingData();
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const unsigned char* getBuffer() const
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{
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return resbuf_;
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}
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size_t getBufferLength() const
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{
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return resbufLength_;
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}
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unsigned char* detachBuffer();
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// Reserves buffer at least minSize. Reallocate memory if current
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// buffer length < minSize
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void reserveBuffer(size_t minSize);
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size_t getMaxPayloadLength()
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{
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return maxPayloadLength_;
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}
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};
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typedef SharedHandle<PeerConnection> PeerConnectionHandle;
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} // namespace aria2
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#endif // D_PEER_CONNECTION_H
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