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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 EthereumSession.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include "EthereumSession.h"
#include <chrono>
#include <libethential/Common.h>
#include <libethcore/Exceptions.h>
#include "BlockChain.h"
#include "EthereumHost.h"
using namespace std;
using namespace eth;
#define clogS(X) eth::LogOutputStream<X, true>(false) << "| " << std::setw(2) << m_socket.native_handle() << "] "
EthereumSession::EthereumSession(EthereumHost* _s, bi::tcp::socket _socket, u256 _rNId, bi::address _peerAddress, unsigned short _peerPort):
m_server(_s),
m_socket(std::move(_socket)),
m_reqNetworkId(_rNId),
m_listenPort(_peerPort),
m_rating(0)
{
m_disconnect = std::chrono::steady_clock::time_point::max();
m_connect = std::chrono::steady_clock::now();
m_info = PeerInfo({"?", _peerAddress.to_string(), m_listenPort, std::chrono::steady_clock::duration(0)});
}
EthereumSession::~EthereumSession()
{
giveUpOnFetch();
// Read-chain finished for one reason or another.
try
{
if (m_socket.is_open())
m_socket.close();
}
catch (...){}
}
inline string toString(h256s const& _bs)
{
ostringstream out;
out << "[ ";
for (auto i: _bs)
out << i.abridged() << ", ";
out << "]";
return out.str();
}
void EthereumSession::giveUpOnFetch()
{
clogS(NetNote) << "GIVE UP FETCH; can't get " << toString(m_askedBlocks);
if (m_askedBlocks.size())
{
Guard l (m_server->x_blocksNeeded);
m_server->m_blocksNeeded.reserve(m_server->m_blocksNeeded.size() + m_askedBlocks.size());
for (auto i: m_askedBlocks)
{
m_failedBlocks.insert(i);
m_server->m_blocksOnWay.erase(i);
m_server->m_blocksNeeded.push_back(i);
}
m_askedBlocks.clear();
}
}
bi::tcp::endpoint EthereumSession::endpoint() const
{
if (m_socket.is_open())
try
{
return bi::tcp::endpoint(m_socket.remote_endpoint().address(), m_listenPort);
}
catch (...){}
return bi::tcp::endpoint();
}
bool EthereumSession::interpret(RLP const& _r)
{
clogS(NetRight) << _r;
switch (_r[0].toInt<unsigned>())
{
case HelloPacket:
{
m_protocolVersion = _r[1].toInt<uint>();
m_networkId = _r[2].toInt<u256>();
auto clientVersion = _r[3].toString();
m_caps = _r[4].toInt<uint>();
m_listenPort = _r[5].toInt<unsigned short>();
m_id = _r[6].toHash<h512>();
m_totalDifficulty = _r[7].toInt<u256>();
m_latestHash = _r[8].toHash<h256>();
auto genesisHash = _r[9].toHash<h256>();
clogS(NetMessageSummary) << "Hello: " << clientVersion << "V[" << m_protocolVersion << "/" << m_networkId << "/" << genesisHash.abridged() << "]" << m_id.abridged() << showbase << hex << m_caps << dec << m_listenPort;
if (m_server->havePeer(m_id))
{
// Already connected.
cwarn << "Already have peer id" << m_id.abridged();// << "at" << l->endpoint() << "rather than" << endpoint();
disconnect(DuplicatePeer);
return false;
}
if (genesisHash != m_server->m_chain->genesisHash())
{
disconnect(WrongGenesis);
return false;
}
if (m_protocolVersion != EthereumHost::protocolVersion() || m_networkId != m_server->networkId() || !m_id)
{
disconnect(IncompatibleProtocol);
return false;
}
try
{ m_info = PeerInfo({clientVersion, m_socket.remote_endpoint().address().to_string(), m_listenPort, std::chrono::steady_clock::duration()}); }
catch (...)
{
disconnect(BadProtocol);
return false;
}
m_server->registerPeer(shared_from_this());
startInitialSync();
// Grab trsansactions off them.
{
RLPStream s;
prep(s).appendList(1);
s << GetTransactionsPacket;
sealAndSend(s);
}
break;
}
case DisconnectPacket:
{
string reason = "Unspecified";
if (_r[1].isInt())
reason = reasonOf((DisconnectReason)_r[1].toInt<int>());
clogS(NetMessageSummary) << "Disconnect (reason: " << reason << ")";
if (m_socket.is_open())
clogS(NetNote) << "Closing " << m_socket.remote_endpoint();
else
clogS(NetNote) << "Remote closed.";
m_socket.close();
return false;
}
case PingPacket:
{
clogS(NetTriviaSummary) << "Ping";
RLPStream s;
sealAndSend(prep(s).appendList(1) << PongPacket);
break;
}
case PongPacket:
m_info.lastPing = std::chrono::steady_clock::now() - m_ping;
clogS(NetTriviaSummary) << "Latency: " << chrono::duration_cast<chrono::milliseconds>(m_info.lastPing).count() << " ms";
break;
case GetPeersPacket:
{
clogS(NetTriviaSummary) << "GetPeers";
auto peers = m_server->potentialPeers();
RLPStream s;
prep(s).appendList(peers.size() + 1);
s << PeersPacket;
for (auto i: peers)
{
clogS(NetTriviaDetail) << "Sending peer " << i.first.abridged() << i.second;
s.appendList(3) << bytesConstRef(i.second.address().to_v4().to_bytes().data(), 4) << i.second.port() << i.first;
}
sealAndSend(s);
break;
}
case PeersPacket:
clogS(NetTriviaSummary) << "Peers (" << dec << (_r.itemCount() - 1) << " entries)";
for (unsigned i = 1; i < _r.itemCount(); ++i)
{
bi::address_v4 peerAddress(_r[i][0].toHash<FixedHash<4>>().asArray());
auto ep = bi::tcp::endpoint(peerAddress, _r[i][1].toInt<short>());
Public id = _r[i][2].toHash<Public>();
if (isPrivateAddress(peerAddress))
goto CONTINUE;
clogS(NetAllDetail) << "Checking: " << ep << "(" << id.abridged() << ")";
// check that it's not us or one we already know:
if (id && (m_server->m_key.pub() == id || m_server->havePeer(id) || m_server->m_incomingPeers.count(id)))
goto CONTINUE;
// check that we're not already connected to addr:
if (!ep.port())
goto CONTINUE;
for (auto i: m_server->m_addresses)
if (ep.address() == i && ep.port() == m_server->listenPort())
goto CONTINUE;
for (auto i: m_server->m_incomingPeers)
if (i.second.first == ep)
goto CONTINUE;
m_server->m_incomingPeers[id] = make_pair(ep, 0);
m_server->m_freePeers.push_back(id);
m_server->noteNewPeers();
clogS(NetTriviaDetail) << "New peer: " << ep << "(" << id << ")";
CONTINUE:;
}
break;
case TransactionsPacket:
if (m_server->m_mode == NodeMode::PeerServer)
break;
clogS(NetMessageSummary) << "Transactions (" << dec << (_r.itemCount() - 1) << " entries)";
m_rating += _r.itemCount() - 1;
for (unsigned i = 1; i < _r.itemCount(); ++i)
{
m_server->m_incomingTransactions.push_back(_r[i].data().toBytes());
m_knownTransactions.insert(sha3(_r[i].data()));
}
break;
case GetBlockHashesPacket:
{
if (m_server->m_mode == NodeMode::PeerServer)
break;
h256 later = _r[1].toHash<h256>();
unsigned limit = _r[2].toInt<unsigned>();
clogS(NetMessageSummary) << "GetBlockHashes (" << limit << "entries, " << later.abridged() << ")";
unsigned c = min<unsigned>(m_server->m_chain->number(later), limit);
RLPStream s;
prep(s).appendList(1 + c).append(BlockHashesPacket);
h256 p = m_server->m_chain->details(later).parent;
for (unsigned i = 0; i < c; ++i, p = m_server->m_chain->details(p).parent)
s << p;
sealAndSend(s);
break;
}
case BlockHashesPacket:
{
if (m_server->m_mode == NodeMode::PeerServer)
break;
clogS(NetMessageSummary) << "BlockHashes (" << dec << (_r.itemCount() - 1) << " entries)";
if (_r.itemCount() == 1)
{
m_server->noteHaveChain(shared_from_this());
return true;
}
for (unsigned i = 1; i < _r.itemCount(); ++i)
{
auto h = _r[i].toHash<h256>();
if (m_server->m_chain->details(h))
{
m_server->noteHaveChain(shared_from_this());
return true;
}
else
m_neededBlocks.push_back(h);
}
// run through - ask for more.
RLPStream s;
prep(s).appendList(3);
s << GetBlockHashesPacket << m_neededBlocks.back() << c_maxHashesAsk;
sealAndSend(s);
break;
}
case GetBlocksPacket:
{
if (m_server->m_mode == NodeMode::PeerServer)
break;
clogS(NetMessageSummary) << "GetBlocks (" << dec << (_r.itemCount() - 1) << " entries)";
// TODO: return the requested blocks.
bytes rlp;
unsigned n = 0;
for (unsigned i = 1; i < _r.itemCount() && i <= c_maxBlocks; ++i)
{
auto b = m_server->m_chain->block(_r[i].toHash<h256>());
if (b.size())
{
rlp += b;
++n;
}
}
RLPStream s;
sealAndSend(prep(s).appendList(n + 1).append(BlocksPacket).appendRaw(rlp, n));
break;
}
case BlocksPacket:
{
if (m_server->m_mode == NodeMode::PeerServer)
break;
clogS(NetMessageSummary) << "Blocks (" << dec << (_r.itemCount() - 1) << " entries)";
if (_r.itemCount() == 1 && !m_askedBlocksChanged)
{
// Couldn't get any from last batch - probably got to this peer's latest block - just give up.
giveUpOnFetch();
}
m_askedBlocksChanged = false;
unsigned used = 0;
for (unsigned i = 1; i < _r.itemCount(); ++i)
{
auto h = BlockInfo::headerHash(_r[i].data());
if (m_server->noteBlock(h, _r[i].data()))
used++;
m_askedBlocks.erase(h);
m_knownBlocks.insert(h);
}
m_rating += used;
unsigned knownParents = 0;
unsigned unknownParents = 0;
if (g_logVerbosity >= NetMessageSummary::verbosity)
{
for (unsigned i = 1; i < _r.itemCount(); ++i)
{
auto h = BlockInfo::headerHash(_r[i].data());
BlockInfo bi(_r[i].data());
if (!m_server->m_chain->details(bi.parentHash) && !m_knownBlocks.count(bi.parentHash))
{
unknownParents++;
clogS(NetAllDetail) << "Unknown parent " << bi.parentHash << " of block " << h;
}
else
{
knownParents++;
clogS(NetAllDetail) << "Known parent " << bi.parentHash << " of block " << h;
}
}
}
clogS(NetMessageSummary) << dec << knownParents << " known parents, " << unknownParents << "unknown, " << used << "used.";
continueGettingChain();
break;
}
case GetTransactionsPacket:
{
if (m_server->m_mode == NodeMode::PeerServer)
break;
m_requireTransactions = true;
break;
}
default:
break;
}
return true;
}
void EthereumSession::restartGettingChain()
{
if (m_askedBlocks.size())
{
m_askedBlocksChanged = true; // So that we continue even if the Ask's reply is empty.
m_askedBlocks.clear(); // So that we restart once we get the Ask's reply.
m_failedBlocks.clear();
}
else
ensureGettingChain();
}
void EthereumSession::ensureGettingChain()
{
if (m_askedBlocks.size())
return; // Already asked & waiting for some.
continueGettingChain();
}
void EthereumSession::continueGettingChain()
{
if (!m_askedBlocks.size())
m_askedBlocks = m_server->neededBlocks(m_failedBlocks);
if (m_askedBlocks.size())
{
RLPStream s;
prep(s);
s.appendList(m_askedBlocks.size() + 1) << GetBlocksPacket;
for (auto i: m_askedBlocks)
s << i;
sealAndSend(s);
}
else
{
clogS(NetMessageSummary) << "No blocks left to get. Peer doesn't seem to have " << m_failedBlocks.size() << "of our needed blocks.";
m_server->noteDoneBlocks();
}
}
void EthereumSession::ping()
{
RLPStream s;
sealAndSend(prep(s).appendList(1) << PingPacket);
m_ping = std::chrono::steady_clock::now();
}
void EthereumSession::getPeers()
{
RLPStream s;
sealAndSend(prep(s).appendList(1) << GetPeersPacket);
}
RLPStream& EthereumSession::prep(RLPStream& _s)
{
return _s.appendRaw(bytes(8, 0));
}
void EthereumSession::sealAndSend(RLPStream& _s)
{
bytes b;
_s.swapOut(b);
m_server->seal(b);
sendDestroy(b);
}
bool EthereumSession::checkPacket(bytesConstRef _msg)
{
if (_msg.size() < 8)
return false;
if (!(_msg[0] == 0x22 && _msg[1] == 0x40 && _msg[2] == 0x08 && _msg[3] == 0x91))
return false;
uint32_t len = ((_msg[4] * 256 + _msg[5]) * 256 + _msg[6]) * 256 + _msg[7];
if (_msg.size() != len + 8)
return false;
RLP r(_msg.cropped(8));
if (r.actualSize() != len)
return false;
return true;
}
void EthereumSession::sendDestroy(bytes& _msg)
{
clogS(NetLeft) << RLP(bytesConstRef(&_msg).cropped(8));
if (!checkPacket(bytesConstRef(&_msg)))
{
cwarn << "INVALID PACKET CONSTRUCTED!";
}
bytes buffer = bytes(std::move(_msg));
writeImpl(buffer);
}
void EthereumSession::send(bytesConstRef _msg)
{
clogS(NetLeft) << RLP(_msg.cropped(8));
if (!checkPacket(_msg))
{
cwarn << "INVALID PACKET CONSTRUCTED!";
}
bytes buffer = bytes(_msg.toBytes());
writeImpl(buffer);
}
void EthereumSession::writeImpl(bytes& _buffer)
{
// cerr << (void*)this << " writeImpl" << endl;
if (!m_socket.is_open())
return;
lock_guard<recursive_mutex> l(m_writeLock);
m_writeQueue.push_back(_buffer);
if (m_writeQueue.size() == 1)
write();
}
void EthereumSession::write()
{
// cerr << (void*)this << " write" << endl;
lock_guard<recursive_mutex> l(m_writeLock);
if (m_writeQueue.empty())
return;
const bytes& bytes = m_writeQueue[0];
auto self(shared_from_this());
ba::async_write(m_socket, ba::buffer(bytes), [this, self](boost::system::error_code ec, std::size_t /*length*/)
{
// cerr << (void*)this << " write.callback" << endl;
// must check queue, as write callback can occur following dropped()
if (ec)
{
cwarn << "Error sending: " << ec.message();
dropped();
}
else
{
m_writeQueue.pop_front();
write();
}
});
}
void EthereumSession::dropped()
{
// cerr << (void*)this << " dropped" << endl;
if (m_socket.is_open())
try
{
clogS(NetConnect) << "Closing " << m_socket.remote_endpoint();
m_socket.close();
}
catch (...) {}
}
void EthereumSession::disconnect(int _reason)
{
clogS(NetConnect) << "Disconnecting (reason:" << reasonOf((DisconnectReason)_reason) << ")";
if (m_socket.is_open())
{
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 EthereumSession::start()
{
RLPStream s;
prep(s);
s.appendList(10) << HelloPacket
<< (uint)EthereumHost::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()
<< m_server->m_chain->details().totalDifficulty
<< m_server->m_chain->currentHash()
<< m_server->m_chain->genesisHash();
sealAndSend(s);
ping();
getPeers();
doRead();
}
void EthereumSession::startInitialSync()
{
h256 c = m_server->m_chain->currentHash();
uint n = m_server->m_chain->number();
u256 td = max(m_server->m_chain->details().totalDifficulty, m_server->m_totalDifficultyOfNeeded);
clogS(NetAllDetail) << "Initial sync. Latest:" << c.abridged() << ", number:" << n << ", TD: max(" << m_server->m_chain->details().totalDifficulty << "," << m_server->m_totalDifficultyOfNeeded << ") versus " << m_totalDifficulty;
if (td > m_totalDifficulty)
return; // All good - we have the better chain.
// Our chain isn't better - grab theirs.
RLPStream s;
prep(s).appendList(3);
s << GetBlockHashesPacket << m_latestHash << c_maxHashesAsk;
m_neededBlocks = h256s(1, m_latestHash);
sealAndSend(s);
}
void EthereumSession::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)
{
cwarn << "INVALID SYNCHRONISATION TOKEN; expected = 22400891; received = " << toHex(bytesConstRef(m_incoming.data(), 4));
disconnect(BadProtocol);
return;
}
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();
}
}
});
}