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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 "ReceiverMSEHandshakeCommand.h"
#include "PeerReceiveHandshakeCommand.h"
#include "PeerConnection.h"
#include "DownloadEngine.h"
#include "BtHandshakeMessage.h"
#include "DlAbortEx.h"
#include "Peer.h"
#include "message.h"
#include "SocketCore.h"
#include "Logger.h"
#include "prefs.h"
#include "Option.h"
#include "MSEHandshake.h"
#include "ARC4Encryptor.h"
#include "RequestGroupMan.h"
#include "BtRegistry.h"
#include "DownloadContext.h"
#include "array_fun.h"
namespace aria2 {
ReceiverMSEHandshakeCommand::ReceiverMSEHandshakeCommand
(cuid_t cuid,
const std::shared_ptr<Peer>& peer,
DownloadEngine* e,
const std::shared_ptr<SocketCore>& s):
PeerAbstractCommand(cuid, peer, e, s),
sequence_(RECEIVER_IDENTIFY_HANDSHAKE),
mseHandshake_(new MSEHandshake(cuid, s, e->getOption()))
{
setTimeout(e->getOption()->getAsInt(PREF_PEER_CONNECTION_TIMEOUT));
mseHandshake_->setWantRead(true);
}
ReceiverMSEHandshakeCommand::~ReceiverMSEHandshakeCommand()
{
delete mseHandshake_;
}
bool ReceiverMSEHandshakeCommand::exitBeforeExecute()
{
return getDownloadEngine()->isHaltRequested() ||
getDownloadEngine()->getRequestGroupMan()->downloadFinished();
}
bool ReceiverMSEHandshakeCommand::executeInternal()
{
if(mseHandshake_->getWantRead()) {
mseHandshake_->read();
}
bool done = false;
while(!done) {
switch(sequence_) {
case RECEIVER_IDENTIFY_HANDSHAKE: {
MSEHandshake::HANDSHAKE_TYPE type =
mseHandshake_->identifyHandshakeType();
switch(type) {
case MSEHandshake::HANDSHAKE_NOT_YET:
done = true;
break;
case MSEHandshake::HANDSHAKE_ENCRYPTED:
mseHandshake_->initEncryptionFacility(false);
sequence_ = RECEIVER_WAIT_KEY;
break;
case MSEHandshake::HANDSHAKE_LEGACY: {
if(getDownloadEngine()->getOption()->getAsBool(PREF_BT_REQUIRE_CRYPTO)){
throw DL_ABORT_EX
("The legacy BitTorrent handshake is not acceptable by the"
" preference.");
}
auto peerConnection = make_unique<PeerConnection>
(getCuid(), getPeer(), getSocket());
peerConnection->presetBuffer(mseHandshake_->getBuffer(),
mseHandshake_->getBufferLength());
getDownloadEngine()->addCommand
(make_unique<PeerReceiveHandshakeCommand>
(getCuid(),
getPeer(),
getDownloadEngine(),
getSocket(),
std::move(peerConnection)));
return true;
}
default:
throw DL_ABORT_EX("Not supported handshake type.");
}
break;
}
case RECEIVER_WAIT_KEY: {
if(mseHandshake_->receivePublicKey()) {
mseHandshake_->sendPublicKey();
sequence_ = RECEIVER_SEND_KEY_PENDING;
} else {
done = true;
}
break;
}
case RECEIVER_SEND_KEY_PENDING:
if(mseHandshake_->send()) {
sequence_ = RECEIVER_FIND_HASH_MARKER;
} else {
done = true;
}
break;
case RECEIVER_FIND_HASH_MARKER: {
if(mseHandshake_->findReceiverHashMarker()) {
sequence_ = RECEIVER_RECEIVE_PAD_C_LENGTH;
} else {
done = true;
}
break;
}
case RECEIVER_RECEIVE_PAD_C_LENGTH: {
std::vector<std::shared_ptr<DownloadContext> > downloadContexts;
getDownloadEngine()->getBtRegistry()->getAllDownloadContext
(std::back_inserter(downloadContexts));
if(mseHandshake_->receiveReceiverHashAndPadCLength(downloadContexts)) {
sequence_ = RECEIVER_RECEIVE_PAD_C;
} else {
done = true;
}
break;
}
case RECEIVER_RECEIVE_PAD_C: {
if(mseHandshake_->receivePad()) {
sequence_ = RECEIVER_RECEIVE_IA_LENGTH;
} else {
done = true;
}
break;
}
case RECEIVER_RECEIVE_IA_LENGTH: {
if(mseHandshake_->receiveReceiverIALength()) {
sequence_ = RECEIVER_RECEIVE_IA;
} else {
done = true;
}
break;
}
case RECEIVER_RECEIVE_IA: {
if(mseHandshake_->receiveReceiverIA()) {
mseHandshake_->sendReceiverStep2();
sequence_ = RECEIVER_SEND_STEP2_PENDING;
} else {
done = true;
}
break;
}
case RECEIVER_SEND_STEP2_PENDING:
if(mseHandshake_->send()) {
createCommand();
return true;
} else {
done = true;
}
break;
}
}
if(mseHandshake_->getWantRead()) {
setReadCheckSocket(getSocket());
} else {
disableReadCheckSocket();
}
if(mseHandshake_->getWantWrite()) {
setWriteCheckSocket(getSocket());
} else {
disableWriteCheckSocket();
}
addCommandSelf();
return false;
}
void ReceiverMSEHandshakeCommand::createCommand()
{
auto peerConnection = make_unique<PeerConnection>
(getCuid(), getPeer(), getSocket());
if(mseHandshake_->getNegotiatedCryptoType() == MSEHandshake::CRYPTO_ARC4) {
peerConnection->enableEncryption(mseHandshake_->popEncryptor(),
mseHandshake_->popDecryptor());
}
// Since initiator cannot send payload stream before reading step2
// from receiver, mseHandshake_->getBufferLength() should be 0.
peerConnection->presetBuffer(mseHandshake_->getIA(),
mseHandshake_->getIALength());
// TODO add mseHandshake_->getInfoHash() to PeerReceiveHandshakeCommand
// as a hint. If this info hash and one in BitTorrent Handshake does not
// match, then drop connection.
getDownloadEngine()->addCommand(make_unique<PeerReceiveHandshakeCommand>
(getCuid(), getPeer(), getDownloadEngine(),
getSocket(), std::move(peerConnection)));
}
} // namespace aria2
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