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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 --> */
#include "BtHandshakeMessage.h"
#include <cstring>
#include "util.h"
#include "a2functional.h"
namespace aria2 {
const unsigned char BtHandshakeMessage::BT_PSTR[] = "BitTorrent protocol";
const char BtHandshakeMessage::NAME[] = "handshake";
BtHandshakeMessage::BtHandshakeMessage() : SimpleBtMessage(ID, NAME) { init(); }
BtHandshakeMessage::BtHandshakeMessage(const unsigned char* infoHash,
const unsigned char* peerId)
: SimpleBtMessage(ID, NAME)
{
init();
std::copy_n(infoHash, infoHash_.size(), std::begin(infoHash_));
std::copy_n(peerId, peerId_.size(), std::begin(peerId_));
}
BtHandshakeMessage::~BtHandshakeMessage() {}
void BtHandshakeMessage::init()
{
pstrlen_ = 19;
std::copy_n(BT_PSTR, pstr_.size(), std::begin(pstr_));
std::fill(std::begin(reserved_), std::end(reserved_), 0);
// fast extension
reserved_[7] |= 0x04u;
// extended messaging
reserved_[5] |= 0x10u;
}
std::unique_ptr<BtHandshakeMessage>
BtHandshakeMessage::create(const unsigned char* data, size_t dataLength)
{
auto msg = make_unique<BtHandshakeMessage>();
msg->pstrlen_ = data[0];
std::copy_n(&data[1], msg->pstr_.size(), std::begin(msg->pstr_));
std::copy_n(&data[20], msg->reserved_.size(), std::begin(msg->reserved_));
std::copy_n(&data[28], msg->infoHash_.size(), std::begin(msg->infoHash_));
std::copy_n(&data[48], msg->peerId_.size(), std::begin(msg->peerId_));
return msg;
}
std::vector<unsigned char> BtHandshakeMessage::createMessage()
{
auto msg = std::vector<unsigned char>(MESSAGE_LENGTH);
auto dst = msg.data();
*dst++ = pstrlen_;
dst = std::copy(std::begin(pstr_), std::end(pstr_), dst);
dst = std::copy(std::begin(reserved_), std::end(reserved_), dst);
dst = std::copy(std::begin(infoHash_), std::end(infoHash_), dst);
std::copy(std::begin(peerId_), std::end(peerId_), dst);
return msg;
}
std::string BtHandshakeMessage::toString() const
{
return fmt("%s peerId=%s, reserved=%s", NAME,
util::percentEncode(peerId_.data(), peerId_.size()).c_str(),
util::toHex(reserved_.data(), reserved_.size()).c_str());
}
bool BtHandshakeMessage::isFastExtensionSupported() const
{
return reserved_[7] & 0x04u;
}
bool BtHandshakeMessage::isExtendedMessagingEnabled() const
{
return reserved_[5] & 0x10u;
}
bool BtHandshakeMessage::isDHTEnabled() const { return reserved_[7] & 0x01u; }
void BtHandshakeMessage::setInfoHash(const unsigned char* infoHash)
{
std::copy_n(infoHash, infoHash_.size(), std::begin(infoHash_));
}
void BtHandshakeMessage::setPeerId(const unsigned char* peerId)
{
std::copy_n(peerId, peerId_.size(), std::begin(peerId_));
}
} // namespace aria2
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