aria2/src/HandshakeExtensionMessage.cc

/* <!-- 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 "HandshakeExtensionMessage.h"
#include "Peer.h"
#include "BtContext.h"
#include "Dictionary.h"
#include "Data.h"
#include "Util.h"
#include "BencodeVisitor.h"
#include "MetaFileUtil.h"
#include "DlAbortEx.h"
#include "LogFactory.h"
#include "Logger.h"
#include "message.h"
#include "StringFormat.h"

namespace aria2 {

const std::string HandshakeExtensionMessage::EXTENSION_NAME = "handshake";

HandshakeExtensionMessage::HandshakeExtensionMessage():
  _tcpPort(0),
  _logger(LogFactory::getInstance()) {}

HandshakeExtensionMessage::~HandshakeExtensionMessage() {}

std::string HandshakeExtensionMessage::getBencodedData()
{
  SharedHandle<Dictionary> dic(new Dictionary());
  if(!_clientVersion.empty()) {
    Data* v = new Data(_clientVersion);
    dic->put("v", v);
  }
  if(_tcpPort > 0) {
    std::string portStr = Util::uitos(_tcpPort);
    Data* p = new Data(portStr, true);
    dic->put("p", p);
  }
  Dictionary* exts = new Dictionary();
  dic->put("m", exts);
  for(std::map<std::string, uint8_t>::const_iterator itr = _extensions.begin();
      itr != _extensions.end(); ++itr) {
    const std::map<std::string, uint8_t>::value_type& vt = *itr;
    std::string idStr = Util::uitos(vt.second);
    exts->put(vt.first, new Data(idStr, true));
  }
  BencodeVisitor v;
  dic->accept(&v);
  return v.getBencodedData();
}

std::string HandshakeExtensionMessage::toString() const
{
  std::string s = getExtensionName();
  if(!_clientVersion.empty()) {
    s += " client="+Util::urlencode(_clientVersion);
  }
  if(_tcpPort > 0) {
    s += ", tcpPort="+Util::uitos(_tcpPort);
  }
  for(std::map<std::string, uint8_t>::const_iterator itr = _extensions.begin();
      itr != _extensions.end(); ++itr) {
    const std::map<std::string, uint8_t>::value_type& vt = *itr;
    s += ", "+vt.first+"="+Util::uitos(vt.second);
  }
  return s;
}

void HandshakeExtensionMessage::doReceivedAction()
{
  if(_tcpPort > 0) {
    _peer->port = _tcpPort;
    _peer->setIncomingPeer(false);
  }
  for(std::map<std::string, uint8_t>::const_iterator itr = _extensions.begin();
      itr != _extensions.end(); ++itr) {
    const std::map<std::string, uint8_t>::value_type& vt = *itr;
    _peer->setExtension(vt.first, vt.second);
  }
}

void HandshakeExtensionMessage::setPeer(const PeerHandle& peer)
{
  _peer = peer;
}

void HandshakeExtensionMessage::setBtContext(const BtContextHandle& btContext)
{
  _btContext = btContext;
}

uint8_t HandshakeExtensionMessage::getExtensionMessageID(const std::string& name) const
{
  std::map<std::string, uint8_t>::const_iterator i = _extensions.find(name);
  if(i == _extensions.end()) {
    return 0;
  } else {
    return (*i).second;
  }
}

HandshakeExtensionMessageHandle
HandshakeExtensionMessage::create(const unsigned char* data, size_t length)
{
  if(length < 1) {
    throw DlAbortEx
      (StringFormat(MSG_TOO_SMALL_PAYLOAD_SIZE,
		    EXTENSION_NAME.c_str(), length).str());
  }
  HandshakeExtensionMessageHandle msg(new HandshakeExtensionMessage());
  msg->_logger->debug("Creating HandshakeExtensionMessage from %s",
		      Util::urlencode(data, length).c_str());
  SharedHandle<MetaEntry> root(MetaFileUtil::bdecoding(data+1, length-1));
  Dictionary* d = dynamic_cast<Dictionary*>(root.get());
  if(d == 0) {
    throw DlAbortEx("Unexpected payload format for extended message handshake");
  }
  const Data* p = dynamic_cast<const Data*>(d->get("p"));
  if(p) {
    msg->_tcpPort = p->toInt();
  }
  const Data* v = dynamic_cast<const Data*>(d->get("v"));
  if(v) {
    msg->_clientVersion = v->toString();
  }
  const Dictionary* m = dynamic_cast<const Dictionary*>(d->get("m"));
  if(m) {
    const std::deque<std::string>& order = m->getOrder();
    for(std::deque<std::string>::const_iterator i = order.begin(); i != order.end(); ++i) {
      const Data* e = dynamic_cast<const Data*>(m->get(*i));
      if(e) {
	msg->_extensions[*i] = e->toInt();
      }
    }
  }
  return msg;
}

} // namespace aria2