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/*
This file is part of cpp-ethereum.
cpp-ethereum 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 3 of the License, or
(at your option) any later version.
cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file RLPXFrameReader.cpp
* @author Alex Leverington <nessence@gmail.com>
* @date 2015
*/
#include "RLPXFrameReader.h"
using namespace std;
using namespace dev;
using namespace dev::p2p;
std::vector<RLPXPacket> RLPXFrameReader::demux(RLPXFrameCoder& _coder, RLPXFrameInfo const& _info, bytesRef _frame)
{
if (!_coder.authAndDecryptFrame(_frame))
BOOST_THROW_EXCEPTION(RLPXFrameDecryptFailed());
std::vector<RLPXPacket> ret;
if (_frame.empty())
// drop: bad frame (empty)
return ret;
if (_info.multiFrame && _info.totalLength && _frame.size() > _info.totalLength)
// drop: bad frame (too large)
return ret;
// trim mac
bytesConstRef buffer = _frame.cropped(0, _frame.size() - (h128::size + _info.padding));
// continue populating multiframe packets
if (_info.multiFrame && m_incomplete.count(_info.sequenceId))
{
uint32_t& remaining = m_incomplete.at(_info.sequenceId).second;
if (!_info.totalLength && buffer.size() > 0 && buffer.size() <= remaining)
{
remaining -= buffer.size();
RLPXPacket& p = m_incomplete.at(_info.sequenceId).first;
if(p.append(buffer) && !remaining)
ret.push_back(std::move(p));
if (!remaining)
m_incomplete.erase(_info.sequenceId);
if (!ret.empty() && remaining)
BOOST_THROW_EXCEPTION(RLPXInvalidPacket());
else if (ret.empty() && !remaining)
BOOST_THROW_EXCEPTION(RLPXInvalidPacket());
return ret;
}
else
m_incomplete.erase(_info.sequenceId);
}
while (!buffer.empty())
{
auto type = nextRLP(buffer);
if (type.empty())
break;
buffer = buffer.cropped(type.size());
// consume entire buffer if packet has sequence
auto packet = _info.multiFrame ? buffer : nextRLP(buffer);
buffer = buffer.cropped(packet.size());
RLPXPacket p(m_protocolType, type);
if (!packet.empty())
p.append(packet);
uint32_t remaining = _info.totalLength - type.size() - packet.size();
if (p.isValid())
ret.push_back(std::move(p));
else if (_info.multiFrame && remaining)
m_incomplete.insert(std::make_pair(_info.sequenceId, std::make_pair(std::move(p), remaining)));
else
BOOST_THROW_EXCEPTION(RLPXInvalidPacket());
}
return ret;
}