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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 "InitiatorMSEHandshakeCommand.h"
#include "PeerInitiateConnectionCommand.h"
#include "PeerInteractionCommand.h"
#include "DownloadEngine.h"
#include "DlAbortEx.h"
#include "message.h"
#include "prefs.h"
#include "Socket.h"
#include "Logger.h"
#include "Peer.h"
#include "PeerConnection.h"
#include "BtRuntime.h"
#include "PeerStorage.h"
#include "PieceStorage.h"
#include "Option.h"
#include "MSEHandshake.h"
#include "ARC4Encryptor.h"
#include "ARC4Decryptor.h"
#include "RequestGroup.h"
#include "DownloadContext.h"
#include "bittorrent_helper.h"
#include "util.h"
namespace aria2 {
InitiatorMSEHandshakeCommand::InitiatorMSEHandshakeCommand
(cuid_t cuid,
RequestGroup* requestGroup,
const SharedHandle<Peer>& p,
DownloadEngine* e,
const SharedHandle<BtRuntime>& btRuntime,
const SharedHandle<SocketCore>& s):
PeerAbstractCommand(cuid, p, e, s),
_requestGroup(requestGroup),
_btRuntime(btRuntime),
_sequence(INITIATOR_SEND_KEY),
_mseHandshake(new MSEHandshake(cuid, socket, getOption().get()))
{
disableReadCheckSocket();
setWriteCheckSocket(socket);
setTimeout(getOption()->getAsInt(PREF_PEER_CONNECTION_TIMEOUT));
_btRuntime->increaseConnections();
_requestGroup->increaseNumCommand();
}
InitiatorMSEHandshakeCommand::~InitiatorMSEHandshakeCommand()
{
_requestGroup->decreaseNumCommand();
_btRuntime->decreaseConnections();
delete _mseHandshake;
}
bool InitiatorMSEHandshakeCommand::executeInternal() {
switch(_sequence) {
case INITIATOR_SEND_KEY: {
if(!socket->isWritable(0)) {
break;
}
disableWriteCheckSocket();
setReadCheckSocket(socket);
//socket->setBlockingMode();
setTimeout(getOption()->getAsInt(PREF_BT_TIMEOUT));
_mseHandshake->initEncryptionFacility(true);
if(_mseHandshake->sendPublicKey()) {
_sequence = INITIATOR_WAIT_KEY;
} else {
setWriteCheckSocket(socket);
_sequence = INITIATOR_SEND_KEY_PENDING;
}
break;
}
case INITIATOR_SEND_KEY_PENDING:
if(_mseHandshake->sendPublicKey()) {
disableWriteCheckSocket();
_sequence = INITIATOR_WAIT_KEY;
}
break;
case INITIATOR_WAIT_KEY: {
if(_mseHandshake->receivePublicKey()) {
_mseHandshake->initCipher
(bittorrent::getInfoHash(_requestGroup->getDownloadContext()));;
if(_mseHandshake->sendInitiatorStep2()) {
_sequence = INITIATOR_FIND_VC_MARKER;
} else {
setWriteCheckSocket(socket);
_sequence = INITIATOR_SEND_STEP2_PENDING;
}
}
break;
}
case INITIATOR_SEND_STEP2_PENDING:
if(_mseHandshake->sendInitiatorStep2()) {
disableWriteCheckSocket();
_sequence = INITIATOR_FIND_VC_MARKER;
}
break;
case INITIATOR_FIND_VC_MARKER: {
if(_mseHandshake->findInitiatorVCMarker()) {
_sequence = INITIATOR_RECEIVE_PAD_D_LENGTH;
}
break;
}
case INITIATOR_RECEIVE_PAD_D_LENGTH: {
if(_mseHandshake->receiveInitiatorCryptoSelectAndPadDLength()) {
_sequence = INITIATOR_RECEIVE_PAD_D;
}
break;
}
case INITIATOR_RECEIVE_PAD_D: {
if(_mseHandshake->receivePad()) {
SharedHandle<PeerConnection> peerConnection
(new PeerConnection(cuid, socket));
if(_mseHandshake->getNegotiatedCryptoType() == MSEHandshake::CRYPTO_ARC4) {
peerConnection->enableEncryption(_mseHandshake->getEncryptor(),
_mseHandshake->getDecryptor());
}
PeerInteractionCommand* c =
new PeerInteractionCommand
(cuid, _requestGroup, peer, e, _btRuntime, _pieceStorage, _peerStorage,
socket,
PeerInteractionCommand::INITIATOR_SEND_HANDSHAKE,
peerConnection);
e->commands.push_back(c);
return true;
}
break;
}
}
e->commands.push_back(this);
return false;
}
bool InitiatorMSEHandshakeCommand::prepareForNextPeer(time_t wait)
{
if(getOption()->getAsBool(PREF_BT_REQUIRE_CRYPTO)) {
if(logger->info()) {
logger->info("CUID#%s - Establishing connection using legacy BitTorrent"
" handshake is disabled by preference.",
util::itos(cuid).c_str());
}
if(_peerStorage->isPeerAvailable() && _btRuntime->lessThanEqMinPeers()) {
SharedHandle<Peer> peer = _peerStorage->getUnusedPeer();
peer->usedBy(e->newCUID());
PeerInitiateConnectionCommand* command =
new PeerInitiateConnectionCommand(peer->usedBy(), _requestGroup, peer,
e, _btRuntime);
command->setPeerStorage(_peerStorage);
command->setPieceStorage(_pieceStorage);
e->commands.push_back(command);
}
return true;
} else {
// try legacy BitTorrent handshake
if(logger->info()) {
logger->info("CUID#%s - Retry using legacy BitTorrent handshake.",
util::itos(cuid).c_str());
}
PeerInitiateConnectionCommand* command =
new PeerInitiateConnectionCommand(cuid, _requestGroup, peer, e,
_btRuntime, false);
command->setPeerStorage(_peerStorage);
command->setPieceStorage(_pieceStorage);
e->commands.push_back(command);
return true;
}
}
void InitiatorMSEHandshakeCommand::onAbort()
{
if(getOption()->getAsBool(PREF_BT_REQUIRE_CRYPTO)) {
_peerStorage->returnPeer(peer);
}
}
bool InitiatorMSEHandshakeCommand::exitBeforeExecute()
{
return _btRuntime->isHalt();
}
void InitiatorMSEHandshakeCommand::setPeerStorage
(const SharedHandle<PeerStorage>& peerStorage)
{
_peerStorage = peerStorage;
}
void InitiatorMSEHandshakeCommand::setPieceStorage
(const SharedHandle<PieceStorage>& pieceStorage)
{
_pieceStorage = pieceStorage;
}
const SharedHandle<Option>& InitiatorMSEHandshakeCommand::getOption() const
{
return _requestGroup->getOption();
}
} // namespace aria2
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