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612 lines
17 KiB
612 lines
17 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 PeerSession.cpp
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#include "PeerSession.h"
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#include <chrono>
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#include <libethential/Common.h>
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#include <libethcore/Exceptions.h>
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#include "BlockChain.h"
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#include "PeerServer.h"
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using namespace std;
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using namespace eth;
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#define clogS(X) eth::LogOutputStream<X, true>(false) << "| " << std::setw(2) << m_socket.native_handle() << "] "
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static const eth::uint c_maxHashes = 4096; ///< Maximum number of hashes GetChain will ever send.
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static const eth::uint c_maxBlocks = 2048; ///< Maximum number of blocks Blocks will ever send.
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static const eth::uint c_maxBlocksAsk = 512; ///< Maximum number of blocks we ask to receive in Blocks (when using GetChain).
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PeerSession::PeerSession(PeerServer* _s, bi::tcp::socket _socket, uint _rNId, bi::address _peerAddress, unsigned short _peerPort):
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m_server(_s),
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m_socket(std::move(_socket)),
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m_reqNetworkId(_rNId),
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m_listenPort(_peerPort),
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m_rating(0)
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{
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m_disconnect = std::chrono::steady_clock::time_point::max();
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m_connect = std::chrono::steady_clock::now();
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m_info = PeerInfo({"?", _peerAddress.to_string(), m_listenPort, std::chrono::steady_clock::duration(0)});
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}
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PeerSession::~PeerSession()
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{
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// Read-chain finished for one reason or another.
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try
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{
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if (m_socket.is_open())
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m_socket.close();
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}
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catch (...){}
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}
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bi::tcp::endpoint PeerSession::endpoint() const
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{
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if (m_socket.is_open())
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try
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{
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return bi::tcp::endpoint(m_socket.remote_endpoint().address(), m_listenPort);
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}
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catch (...){}
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return bi::tcp::endpoint();
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}
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bool PeerSession::interpret(RLP const& _r)
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{
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clogS(NetRight) << _r;
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switch (_r[0].toInt<unsigned>())
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{
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case HelloPacket:
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{
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m_protocolVersion = _r[1].toInt<uint>();
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m_networkId = _r[2].toInt<uint>();
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auto clientVersion = _r[3].toString();
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m_caps = _r[4].toInt<uint>();
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m_listenPort = _r[5].toInt<unsigned short>();
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m_id = _r[6].toHash<h512>();
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clogS(NetMessageSummary) << "Hello: " << clientVersion << "V[" << m_protocolVersion << "/" << m_networkId << "]" << m_id.abridged() << showbase << hex << m_caps << dec << m_listenPort;
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if (m_server->havePeer(m_id))
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{
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// Already connected.
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cwarn << "Already have peer id" << m_id.abridged();// << "at" << l->endpoint() << "rather than" << endpoint();
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disconnect(DuplicatePeer);
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return false;
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}
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if (m_protocolVersion != PeerServer::protocolVersion() || m_networkId != m_server->networkId() || !m_id)
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{
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disconnect(IncompatibleProtocol);
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return false;
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}
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try
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{ m_info = PeerInfo({clientVersion, m_socket.remote_endpoint().address().to_string(), m_listenPort, std::chrono::steady_clock::duration()}); }
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catch (...)
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{
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disconnect(BadProtocol);
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return false;
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}
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m_server->registerPeer(shared_from_this());
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startInitialSync();
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// Grab trsansactions off them.
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{
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RLPStream s;
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prep(s).appendList(1);
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s << GetTransactionsPacket;
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sealAndSend(s);
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}
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break;
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}
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case DisconnectPacket:
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{
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string reason = "Unspecified";
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if (_r[1].isInt())
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reason = reasonOf((DisconnectReason)_r[1].toInt<int>());
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clogS(NetMessageSummary) << "Disconnect (reason: " << reason << ")";
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if (m_socket.is_open())
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clogS(NetNote) << "Closing " << m_socket.remote_endpoint();
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else
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clogS(NetNote) << "Remote closed.";
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m_socket.close();
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return false;
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}
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case PingPacket:
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{
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clogS(NetTriviaSummary) << "Ping";
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RLPStream s;
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sealAndSend(prep(s).appendList(1) << PongPacket);
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break;
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}
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case PongPacket:
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m_info.lastPing = std::chrono::steady_clock::now() - m_ping;
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clogS(NetTriviaSummary) << "Latency: " << chrono::duration_cast<chrono::milliseconds>(m_info.lastPing).count() << " ms";
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break;
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case GetPeersPacket:
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{
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clogS(NetTriviaSummary) << "GetPeers";
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auto peers = m_server->potentialPeers();
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RLPStream s;
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prep(s).appendList(peers.size() + 1);
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s << PeersPacket;
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for (auto i: peers)
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{
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clogS(NetTriviaDetail) << "Sending peer " << toHex(i.first.ref().cropped(0, 4)) << i.second;
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s.appendList(3) << bytesConstRef(i.second.address().to_v4().to_bytes().data(), 4) << i.second.port() << i.first;
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}
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sealAndSend(s);
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break;
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}
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case PeersPacket:
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clogS(NetTriviaSummary) << "Peers (" << dec << (_r.itemCount() - 1) << " entries)";
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for (unsigned i = 1; i < _r.itemCount(); ++i)
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{
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bi::address_v4 peerAddress(_r[i][0].toHash<FixedHash<4>>().asArray());
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auto ep = bi::tcp::endpoint(peerAddress, _r[i][1].toInt<short>());
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Public id = _r[i][2].toHash<Public>();
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if (isPrivateAddress(peerAddress))
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goto CONTINUE;
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clogS(NetAllDetail) << "Checking: " << ep << "(" << toHex(id.ref().cropped(0, 4)) << ")";
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// check that it's not us or one we already know:
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if (id && (m_server->m_key.pub() == id || m_server->havePeer(id) || m_server->m_incomingPeers.count(id)))
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goto CONTINUE;
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// check that we're not already connected to addr:
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if (!ep.port())
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goto CONTINUE;
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for (auto i: m_server->m_addresses)
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if (ep.address() == i && ep.port() == m_server->listenPort())
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goto CONTINUE;
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for (auto i: m_server->m_incomingPeers)
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if (i.second.first == ep)
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goto CONTINUE;
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m_server->m_incomingPeers[id] = make_pair(ep, 0);
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m_server->m_freePeers.push_back(id);
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clogS(NetTriviaDetail) << "New peer: " << ep << "(" << id << ")";
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CONTINUE:;
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}
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break;
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case TransactionsPacket:
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if (m_server->m_mode == NodeMode::PeerServer)
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break;
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clogS(NetMessageSummary) << "Transactions (" << dec << (_r.itemCount() - 1) << " entries)";
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m_rating += _r.itemCount() - 1;
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for (unsigned i = 1; i < _r.itemCount(); ++i)
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{
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m_server->m_incomingTransactions.push_back(_r[i].data().toBytes());
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m_knownTransactions.insert(sha3(_r[i].data()));
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}
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break;
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case BlocksPacket:
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{
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if (m_server->m_mode == NodeMode::PeerServer)
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break;
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clogS(NetMessageSummary) << "Blocks (" << dec << (_r.itemCount() - 1) << " entries)";
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unsigned used = 0;
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for (unsigned i = 1; i < _r.itemCount(); ++i)
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{
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auto h = sha3(_r[i].data());
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if (m_server->noteBlock(h, _r[i].data()))
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{
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m_knownBlocks.insert(h);
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used++;
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}
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}
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m_rating += used;
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unsigned knownParents = 0;
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unsigned unknownParents = 0;
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if (g_logVerbosity >= 2)
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{
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for (unsigned i = 1; i < _r.itemCount(); ++i)
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{
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auto h = sha3(_r[i].data());
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BlockInfo bi(_r[i].data());
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if (!m_server->m_chain->details(bi.parentHash) && !m_knownBlocks.count(bi.parentHash))
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{
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unknownParents++;
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clogS(NetMessageDetail) << "Unknown parent " << bi.parentHash << " of block " << h;
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}
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else
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{
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knownParents++;
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clogS(NetMessageDetail) << "Known parent " << bi.parentHash << " of block " << h;
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}
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}
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}
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clogS(NetMessageSummary) << dec << knownParents << " known parents, " << unknownParents << "unknown, " << used << "used.";
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if (used) // we received some - check if there's any more
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{
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RLPStream s;
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prep(s).appendList(3);
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s << GetChainPacket;
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s << sha3(_r[1].data());
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s << c_maxBlocksAsk;
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sealAndSend(s);
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}
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else
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clogS(NetMessageSummary) << "Peer sent all blocks in chain.";
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break;
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}
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case GetChainPacket:
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{
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if (m_server->m_mode == NodeMode::PeerServer)
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break;
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clogS(NetMessageSummary) << "GetChain (" << (_r.itemCount() - 2) << " hashes, " << (_r[_r.itemCount() - 1].toInt<bigint>()) << ")";
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// ********************************************************************
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// NEEDS FULL REWRITE!
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h256s parents;
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parents.reserve(_r.itemCount() - 2);
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for (unsigned i = 1; i < _r.itemCount() - 1; ++i)
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parents.push_back(_r[i].toHash<h256>());
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if (_r.itemCount() == 2)
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break;
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// return 2048 block max.
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uint baseCount = (uint)min<bigint>(_r[_r.itemCount() - 1].toInt<bigint>(), c_maxBlocks);
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clogS(NetMessageSummary) << "GetChain (" << baseCount << " max, from " << parents.front() << " to " << parents.back() << ")";
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for (auto parent: parents)
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{
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auto h = m_server->m_chain->currentHash();
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h256 latest = m_server->m_chain->currentHash();
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uint latestNumber = 0;
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uint parentNumber = 0;
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RLPStream s;
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// try to find parent in our blockchain
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// todo: add some delta() fn to blockchain
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BlockDetails fParent = m_server->m_chain->details(parent);
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if (fParent)
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{
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latestNumber = m_server->m_chain->number(latest);
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parentNumber = fParent.number;
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uint count = min<uint>(latestNumber - parentNumber, baseCount);
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clogS(NetAllDetail) << "Requires " << dec << (latestNumber - parentNumber) << " blocks from " << latestNumber << " to " << parentNumber;
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clogS(NetAllDetail) << latest << " - " << parent;
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prep(s);
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s.appendList(1 + count) << BlocksPacket;
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uint endNumber = parentNumber;
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uint startNumber = endNumber + count;
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clogS(NetAllDetail) << "Sending " << dec << count << " blocks from " << startNumber << " to " << endNumber;
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// append blocks
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uint n = latestNumber;
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// seek back (occurs when count is limited by baseCount)
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for (; n > startNumber; n--, h = m_server->m_chain->details(h).parent) {}
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for (uint i = 0; i < count; ++i, --n, h = m_server->m_chain->details(h).parent)
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{
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if (h == parent || n == endNumber)
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{
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cwarn << "BUG! Couldn't create the reply for GetChain!";
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return true;
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}
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clogS(NetAllDetail) << " " << dec << i << " " << h;
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s.appendRaw(m_server->m_chain->block(h));
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}
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if (!count)
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clogS(NetMessageSummary) << "Sent peer all we have.";
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clogS(NetAllDetail) << "Parent: " << h;
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}
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else if (parent != parents.back())
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continue;
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if (h != parent)
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{
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// not in the blockchain;
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if (parent == parents.back())
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{
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// out of parents...
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clogS(NetAllDetail) << "GetChain failed; not in chain";
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// No good - must have been on a different branch.
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s.clear();
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prep(s).appendList(2) << NotInChainPacket << parents.back();
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}
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else
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// still some parents left - try them.
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continue;
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}
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// send the packet (either Blocks or NotInChain) & exit.
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sealAndSend(s);
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break;
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// ********************************************************************
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}
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break;
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}
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case NotInChainPacket:
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{
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if (m_server->m_mode == NodeMode::PeerServer)
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break;
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h256 noGood = _r[1].toHash<h256>();
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clogS(NetMessageSummary) << "NotInChain (" << noGood << ")";
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if (noGood == m_server->m_chain->genesisHash())
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{
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clogS(NetWarn) << "Discordance over genesis block! Disconnect.";
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disconnect(WrongGenesis);
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}
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else
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{
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uint count = std::min(c_maxHashes, m_server->m_chain->number(noGood));
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RLPStream s;
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prep(s).appendList(2 + count);
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s << GetChainPacket;
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auto h = m_server->m_chain->details(noGood).parent;
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for (uint i = 0; i < count; ++i, h = m_server->m_chain->details(h).parent)
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s << h;
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s << c_maxBlocksAsk;
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sealAndSend(s);
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}
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break;
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}
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case GetTransactionsPacket:
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{
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if (m_server->m_mode == NodeMode::PeerServer)
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break;
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m_requireTransactions = true;
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break;
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}
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default:
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break;
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}
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return true;
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}
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void PeerSession::ping()
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{
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RLPStream s;
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sealAndSend(prep(s).appendList(1) << PingPacket);
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m_ping = std::chrono::steady_clock::now();
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}
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RLPStream& PeerSession::prep(RLPStream& _s)
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{
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return _s.appendRaw(bytes(8, 0));
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}
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void PeerSession::sealAndSend(RLPStream& _s)
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{
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bytes b;
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_s.swapOut(b);
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m_server->seal(b);
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sendDestroy(b);
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}
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bool PeerSession::checkPacket(bytesConstRef _msg)
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{
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if (_msg.size() < 8)
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return false;
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if (!(_msg[0] == 0x22 && _msg[1] == 0x40 && _msg[2] == 0x08 && _msg[3] == 0x91))
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return false;
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uint32_t len = ((_msg[4] * 256 + _msg[5]) * 256 + _msg[6]) * 256 + _msg[7];
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if (_msg.size() != len + 8)
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return false;
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RLP r(_msg.cropped(8));
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if (r.actualSize() != len)
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return false;
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return true;
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}
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void PeerSession::sendDestroy(bytes& _msg)
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{
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clogS(NetLeft) << RLP(bytesConstRef(&_msg).cropped(8));
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if (!checkPacket(bytesConstRef(&_msg)))
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{
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cwarn << "INVALID PACKET CONSTRUCTED!";
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}
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bytes buffer = bytes(std::move(_msg));
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writeImpl(buffer);
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}
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void PeerSession::send(bytesConstRef _msg)
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{
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clogS(NetLeft) << RLP(_msg.cropped(8));
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if (!checkPacket(_msg))
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{
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cwarn << "INVALID PACKET CONSTRUCTED!";
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}
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bytes buffer = bytes(_msg.toBytes());
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writeImpl(buffer);
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}
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void PeerSession::writeImpl(bytes& _buffer)
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{
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// cerr << (void*)this << " writeImpl" << endl;
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if (!m_socket.is_open())
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return;
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lock_guard<recursive_mutex> l(m_writeLock);
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m_writeQueue.push_back(_buffer);
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if (m_writeQueue.size() == 1)
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write();
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}
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void PeerSession::write()
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{
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// cerr << (void*)this << " write" << endl;
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lock_guard<recursive_mutex> l(m_writeLock);
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if (m_writeQueue.empty())
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return;
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const bytes& bytes = m_writeQueue[0];
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auto self(shared_from_this());
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ba::async_write(m_socket, ba::buffer(bytes), [this, self](boost::system::error_code ec, std::size_t /*length*/)
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{
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// cerr << (void*)this << " write.callback" << endl;
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// must check queue, as write callback can occur following dropped()
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if (ec)
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{
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cwarn << "Error sending: " << ec.message();
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dropped();
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}
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else
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{
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m_writeQueue.pop_front();
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write();
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}
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});
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}
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void PeerSession::dropped()
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{
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// cerr << (void*)this << " dropped" << endl;
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if (m_socket.is_open())
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try
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{
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clogS(NetConnect) << "Closing " << m_socket.remote_endpoint();
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m_socket.close();
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}
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catch (...) {}
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}
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void PeerSession::disconnect(int _reason)
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{
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clogS(NetConnect) << "Disconnecting (reason:" << reasonOf((DisconnectReason)_reason) << ")";
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if (m_socket.is_open())
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|
{
|
|
if (m_disconnect == chrono::steady_clock::time_point::max())
|
|
{
|
|
RLPStream s;
|
|
prep(s);
|
|
s.appendList(2) << DisconnectPacket << _reason;
|
|
sealAndSend(s);
|
|
m_disconnect = chrono::steady_clock::now();
|
|
}
|
|
else
|
|
dropped();
|
|
}
|
|
}
|
|
|
|
void PeerSession::start()
|
|
{
|
|
RLPStream s;
|
|
prep(s);
|
|
s.appendList(7) << HelloPacket << (uint)PeerServer::protocolVersion() << m_server->networkId() << m_server->m_clientVersion << (m_server->m_mode == NodeMode::Full ? 0x07 : m_server->m_mode == NodeMode::PeerServer ? 0x01 : 0) << m_server->m_public.port() << m_server->m_key.pub();
|
|
sealAndSend(s);
|
|
|
|
ping();
|
|
|
|
doRead();
|
|
}
|
|
|
|
void PeerSession::startInitialSync()
|
|
{
|
|
uint n = m_server->m_chain->number(m_server->m_latestBlockSent);
|
|
clogS(NetAllDetail) << "Want chain. Latest:" << m_server->m_latestBlockSent << ", number:" << n;
|
|
uint count = std::min(c_maxHashes, n + 1);
|
|
RLPStream s;
|
|
prep(s).appendList(2 + count);
|
|
s << GetChainPacket;
|
|
auto h = m_server->m_latestBlockSent;
|
|
for (uint i = 0; i < count; ++i, h = m_server->m_chain->details(h).parent)
|
|
{
|
|
clogS(NetAllDetail) << " " << i << ":" << h;
|
|
s << h;
|
|
}
|
|
|
|
s << c_maxBlocksAsk;
|
|
sealAndSend(s);
|
|
}
|
|
|
|
void PeerSession::doRead()
|
|
{
|
|
// ignore packets received while waiting to disconnect
|
|
if (chrono::steady_clock::now() - m_disconnect > chrono::seconds(0))
|
|
return;
|
|
|
|
auto self(shared_from_this());
|
|
m_socket.async_read_some(boost::asio::buffer(m_data), [this,self](boost::system::error_code ec, std::size_t length)
|
|
{
|
|
// If error is end of file, ignore
|
|
if (ec && ec.category() != boost::asio::error::get_misc_category() && ec.value() != boost::asio::error::eof)
|
|
{
|
|
// got here with length of 1241...
|
|
cwarn << "Error reading: " << ec.message();
|
|
dropped();
|
|
}
|
|
else if (ec && length == 0)
|
|
{
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
try
|
|
{
|
|
m_incoming.resize(m_incoming.size() + length);
|
|
memcpy(m_incoming.data() + m_incoming.size() - length, m_data.data(), length);
|
|
while (m_incoming.size() > 8)
|
|
{
|
|
if (m_incoming[0] != 0x22 || m_incoming[1] != 0x40 || m_incoming[2] != 0x08 || m_incoming[3] != 0x91)
|
|
doRead();
|
|
else
|
|
{
|
|
uint32_t len = fromBigEndian<uint32_t>(bytesConstRef(m_incoming.data() + 4, 4));
|
|
uint32_t tlen = len + 8;
|
|
if (m_incoming.size() < tlen)
|
|
break;
|
|
|
|
// enough has come in.
|
|
auto data = bytesConstRef(m_incoming.data(), tlen);
|
|
if (!checkPacket(data))
|
|
{
|
|
cerr << "Received " << len << ": " << toHex(bytesConstRef(m_incoming.data() + 8, len)) << endl;
|
|
cwarn << "INVALID MESSAGE RECEIVED";
|
|
disconnect(BadProtocol);
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
RLP r(data.cropped(8));
|
|
if (!interpret(r))
|
|
{
|
|
// error
|
|
dropped();
|
|
return;
|
|
}
|
|
}
|
|
memmove(m_incoming.data(), m_incoming.data() + tlen, m_incoming.size() - tlen);
|
|
m_incoming.resize(m_incoming.size() - tlen);
|
|
}
|
|
}
|
|
doRead();
|
|
}
|
|
catch (Exception const& _e)
|
|
{
|
|
clogS(NetWarn) << "ERROR: " << _e.description();
|
|
dropped();
|
|
}
|
|
catch (std::exception const& _e)
|
|
{
|
|
clogS(NetWarn) << "ERROR: " << _e.what();
|
|
dropped();
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|