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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2009 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 "util.h"
#include "DlAbortEx.h"
#include "LogFactory.h"
#include "Logger.h"
#include "message.h"
#include "fmt.h"
#include "bencode2.h"
#include "DownloadContext.h"
#include "bittorrent_helper.h"
#include "RequestGroup.h"
#include "PieceStorage.h"
#include "FileEntry.h"
namespace aria2 {
const std::string HandshakeExtensionMessage::EXTENSION_NAME = "handshake";
HandshakeExtensionMessage::HandshakeExtensionMessage()
: tcpPort_(0),
metadataSize_(0)
{}
HandshakeExtensionMessage::~HandshakeExtensionMessage() {}
std::string HandshakeExtensionMessage::getPayload()
{
Dict dict;
if(!clientVersion_.empty()) {
dict.put("v", clientVersion_);
}
if(tcpPort_ > 0) {
dict.put("p", Integer::g(tcpPort_));
}
SharedHandle<Dict> extDict = Dict::g();
for(std::map<std::string, uint8_t>::const_iterator itr = extensions_.begin(),
eoi = extensions_.end(); itr != eoi; ++itr) {
const std::map<std::string, uint8_t>::value_type& vt = *itr;
extDict->put(vt.first, Integer::g(vt.second));
}
dict.put("m", extDict);
if(metadataSize_) {
dict.put("metadata_size", Integer::g(metadataSize_));
}
return bencode2::encode(&dict);
}
std::string HandshakeExtensionMessage::toString() const
{
std::string s(fmt("%s client=%s, tcpPort=%u, metadataSize=%lu",
getExtensionName().c_str(),
util::percentEncode(clientVersion_).c_str(),
tcpPort_,
static_cast<unsigned long>(metadataSize_)));
for(std::map<std::string, uint8_t>::const_iterator itr = extensions_.begin(),
eoi = extensions_.end(); itr != eoi; ++itr) {
const std::map<std::string, uint8_t>::value_type& vt = *itr;
s += fmt(", %s=%u", vt.first.c_str(), vt.second);
}
return s;
}
void HandshakeExtensionMessage::doReceivedAction()
{
if(tcpPort_ > 0) {
peer_->setPort(tcpPort_);
peer_->setIncomingPeer(false);
}
for(std::map<std::string, uint8_t>::const_iterator itr = extensions_.begin(),
eoi = extensions_.end(); itr != eoi; ++itr) {
const std::map<std::string, uint8_t>::value_type& vt = *itr;
peer_->setExtension(vt.first, vt.second);
}
SharedHandle<TorrentAttribute> attrs = bittorrent::getTorrentAttrs(dctx_);
if(attrs->metadata.empty()) {
if(!peer_->getExtensionMessageID("ut_metadata")) {
// TODO In metadataGetMode, if peer don't support metadata
// transfer, should we drop connection? There is a possibility
// that peer can still tell us peers using PEX.
throw DL_ABORT_EX("Peer doesn't support ut_metadata extension. Goodbye.");
}
if(metadataSize_ > 0) {
if(attrs->metadataSize) {
if(metadataSize_ != attrs->metadataSize) {
throw DL_ABORT_EX("Wrong metadata_size. Which one is correct!?");
}
} else {
attrs->metadataSize = metadataSize_;
dctx_->getFirstFileEntry()->setLength(metadataSize_);
dctx_->markTotalLengthIsKnown();
dctx_->getOwnerRequestGroup()->initPieceStorage();
SharedHandle<PieceStorage> pieceStorage =
dctx_->getOwnerRequestGroup()->getPieceStorage();
// We enter 'end game' mode from the start to get metadata
// quickly.
pieceStorage->enterEndGame();
}
peer_->reconfigureSessionResource(dctx_->getPieceLength(),
dctx_->getTotalLength());
peer_->setAllBitfield();
} else {
throw DL_ABORT_EX("Peer didn't provide metadata_size."
" It seems that it doesn't have whole metadata.");
}
}
}
void HandshakeExtensionMessage::setPeer(const SharedHandle<Peer>& peer)
{
peer_ = peer;
}
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 DL_ABORT_EX
(fmt(MSG_TOO_SMALL_PAYLOAD_SIZE,
EXTENSION_NAME.c_str(),
static_cast<unsigned long>(length)));
}
HandshakeExtensionMessageHandle msg(new HandshakeExtensionMessage());
A2_LOG_DEBUG(fmt("Creating HandshakeExtensionMessage from %s",
util::percentEncode(data, length).c_str()));
SharedHandle<ValueBase> decoded = bencode2::decode(data+1, length - 1);
const Dict* dict = downcast<Dict>(decoded);
if(!dict) {
throw DL_ABORT_EX
("Unexpected payload format for extended message handshake");
}
const Integer* port = downcast<Integer>(dict->get("p"));
if(port && 0 < port->i() && port->i() < 65536) {
msg->tcpPort_ = port->i();
}
const String* version = downcast<String>(dict->get("v"));
if(version) {
msg->clientVersion_ = version->s();
}
const Dict* extDict = downcast<Dict>(dict->get("m"));
if(extDict) {
for(Dict::ValueType::const_iterator i = extDict->begin(),
eoi = extDict->end(); i != eoi; ++i) {
const Integer* extId = downcast<Integer>((*i).second);
if(extId) {
msg->extensions_[(*i).first] = extId->i();
}
}
}
const Integer* metadataSize = downcast<Integer>(dict->get("metadata_size"));
// Only accept metadata smaller than 1MiB
if(metadataSize && metadataSize->i() <= 1024*1024) {
msg->metadataSize_ = metadataSize->i();
}
return msg;
}
} // namespace aria2
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