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90 lines
2.8 KiB
90 lines
2.8 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file RLPXFrameReader.cpp
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* @author Alex Leverington <nessence@gmail.com>
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* @date 2015
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*/
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#include "RLPXFrameReader.h"
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using namespace std;
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using namespace dev;
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using namespace dev::p2p;
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std::vector<RLPXPacket> RLPXFrameReader::demux(RLPXFrameCoder& _coder, RLPXFrameInfo const& _info, bytesRef _frame)
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{
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if (!_coder.authAndDecryptFrame(_frame))
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BOOST_THROW_EXCEPTION(RLPXFrameDecryptFailed());
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std::vector<RLPXPacket> ret;
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if (_frame.empty())
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// drop: bad frame (empty)
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return ret;
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if (_info.multiFrame && _info.totalLength && _frame.size() > _info.totalLength)
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// drop: bad frame (too large)
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return ret;
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// trim mac
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bytesConstRef buffer = _frame.cropped(0, _frame.size() - (h128::size + _info.padding));
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// continue populating multiframe packets
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if (_info.multiFrame && m_incomplete.count(_info.sequenceId))
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{
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uint32_t& remaining = m_incomplete.at(_info.sequenceId).second;
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if (!_info.totalLength && buffer.size() > 0 && buffer.size() <= remaining)
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{
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remaining -= buffer.size();
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RLPXPacket& p = m_incomplete.at(_info.sequenceId).first;
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if(p.append(buffer) && !remaining)
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ret.push_back(std::move(p));
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if (!remaining)
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m_incomplete.erase(_info.sequenceId);
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if (!ret.empty() && remaining)
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BOOST_THROW_EXCEPTION(RLPXInvalidPacket());
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else if (ret.empty() && !remaining)
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BOOST_THROW_EXCEPTION(RLPXInvalidPacket());
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return ret;
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}
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else
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m_incomplete.erase(_info.sequenceId);
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}
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while (!buffer.empty())
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{
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auto type = nextRLP(buffer);
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if (type.empty())
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break;
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buffer = buffer.cropped(type.size());
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// consume entire buffer if packet has sequence
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auto packet = _info.multiFrame ? buffer : nextRLP(buffer);
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buffer = buffer.cropped(packet.size());
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RLPXPacket p(m_protocolType, type);
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if (!packet.empty())
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p.append(packet);
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uint32_t remaining = _info.totalLength - type.size() - packet.size();
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if (p.isValid())
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ret.push_back(std::move(p));
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else if (_info.multiFrame && remaining)
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m_incomplete.insert(std::make_pair(_info.sequenceId, std::make_pair(std::move(p), remaining)));
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else
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BOOST_THROW_EXCEPTION(RLPXInvalidPacket());
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}
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return ret;
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}
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