diff options
Diffstat (limited to 'src/net.cpp')
| -rw-r--r-- | src/net.cpp | 246 |
1 files changed, 93 insertions, 153 deletions
diff --git a/src/net.cpp b/src/net.cpp index b39ef9f54a..4ab8ef98ab 100644 --- a/src/net.cpp +++ b/src/net.cpp @@ -63,6 +63,8 @@ const static std::string NET_MESSAGE_COMMAND_OTHER = "*other*"; +static const uint64_t RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL; // SHA256("netgroup")[0:8] +static const uint64_t RANDOMIZER_ID_LOCALHOSTNONCE = 0xd93e69e2bbfa5735ULL; // SHA256("localhostnonce")[0:8] // // Global state variables // @@ -186,7 +188,8 @@ void AdvertiseLocal(CNode *pnode) if (addrLocal.IsRoutable()) { LogPrint("net", "AdvertiseLocal: advertising address %s\n", addrLocal.ToString()); - pnode->PushAddress(addrLocal); + FastRandomContext insecure_rand; + pnode->PushAddress(addrLocal, insecure_rand); } } } @@ -387,18 +390,18 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo addrman.Attempt(addrConnect, fCountFailure); // Add node - CNode* pnode = new CNode(GetNewNodeId(), nLocalServices, GetBestHeight(), hSocket, addrConnect, pszDest ? pszDest : "", false); - GetNodeSignals().InitializeNode(pnode->GetId(), pnode); + NodeId id = GetNewNodeId(); + uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize(); + CNode* pnode = new CNode(id, nLocalServices, GetBestHeight(), hSocket, addrConnect, CalculateKeyedNetGroup(addrConnect), nonce, pszDest ? pszDest : "", false); + pnode->nServicesExpected = ServiceFlags(addrConnect.nServices & nRelevantServices); + pnode->nTimeConnected = GetTime(); pnode->AddRef(); - + GetNodeSignals().InitializeNode(pnode, *this); { LOCK(cs_vNodes); vNodes.push_back(pnode); } - pnode->nServicesExpected = ServiceFlags(addrConnect.nServices & nRelevantServices); - pnode->nTimeConnected = GetTime(); - return pnode; } else if (!proxyConnectionFailed) { // If connecting to the node failed, and failure is not caused by a problem connecting to @@ -444,23 +447,6 @@ void CNode::CloseSocketDisconnect() vRecvMsg.clear(); } -void CNode::PushVersion() -{ - int64_t nTime = (fInbound ? GetAdjustedTime() : GetTime()); - CAddress addrYou = (addr.IsRoutable() && !IsProxy(addr) ? addr : CAddress(CService(), addr.nServices)); - CAddress addrMe = GetLocalAddress(&addr, nLocalServices); - if (fLogIPs) - LogPrint("net", "send version message: version %d, blocks=%d, us=%s, them=%s, peer=%d\n", PROTOCOL_VERSION, nMyStartingHeight, addrMe.ToString(), addrYou.ToString(), id); - else - LogPrint("net", "send version message: version %d, blocks=%d, us=%s, peer=%d\n", PROTOCOL_VERSION, nMyStartingHeight, addrMe.ToString(), id); - PushMessage(NetMsgType::VERSION, PROTOCOL_VERSION, (uint64_t)nLocalServices, nTime, addrYou, addrMe, - nLocalHostNonce, strSubVersion, nMyStartingHeight, ::fRelayTxes); -} - - - - - void CConnman::ClearBanned() { { @@ -628,6 +614,7 @@ void CNode::copyStats(CNodeStats &stats) { stats.nodeid = this->GetId(); X(nServices); + X(addr); X(fRelayTxes); X(nLastSend); X(nLastRecv); @@ -657,7 +644,7 @@ void CNode::copyStats(CNodeStats &stats) // Raw ping time is in microseconds, but show it to user as whole seconds (Bitcoin users should be well used to small numbers with many decimal places by now :) stats.dPingTime = (((double)nPingUsecTime) / 1e6); - stats.dPingMin = (((double)nMinPingUsecTime) / 1e6); + stats.dMinPing = (((double)nMinPingUsecTime) / 1e6); stats.dPingWait = (((double)nPingUsecWait) / 1e6); // Leave string empty if addrLocal invalid (not filled in yet) @@ -822,7 +809,7 @@ struct NodeEvictionCandidate int64_t nMinPingUsecTime; int64_t nLastBlockTime; int64_t nLastTXTime; - bool fNetworkNode; + bool fRelevantServices; bool fRelayTxes; bool fBloomFilter; CAddress addr; @@ -847,7 +834,7 @@ static bool CompareNodeBlockTime(const NodeEvictionCandidate &a, const NodeEvict { // There is a fall-through here because it is common for a node to have many peers which have not yet relayed a block. if (a.nLastBlockTime != b.nLastBlockTime) return a.nLastBlockTime < b.nLastBlockTime; - if (a.fNetworkNode != b.fNetworkNode) return b.fNetworkNode; + if (a.fRelevantServices != b.fRelevantServices) return b.fRelevantServices; return a.nTimeConnected > b.nTimeConnected; } @@ -882,7 +869,8 @@ bool CConnman::AttemptToEvictConnection() if (node->fDisconnect) continue; NodeEvictionCandidate candidate = {node->id, node->nTimeConnected, node->nMinPingUsecTime, - node->nLastBlockTime, node->nLastTXTime, node->fNetworkNode, + node->nLastBlockTime, node->nLastTXTime, + (node->nServices & nRelevantServices) == nRelevantServices, node->fRelayTxes, node->pfilter != NULL, node->addr, node->nKeyedNetGroup}; vEvictionCandidates.push_back(candidate); } @@ -967,7 +955,6 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) { CAddress addr; int nInbound = 0; int nMaxInbound = nMaxConnections - (nMaxOutbound + nMaxFeeler); - assert(nMaxInbound > 0); if (hSocket != INVALID_SOCKET) if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr)) @@ -1022,10 +1009,13 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) { } } - CNode* pnode = new CNode(GetNewNodeId(), nLocalServices, GetBestHeight(), hSocket, addr, "", true); - GetNodeSignals().InitializeNode(pnode->GetId(), pnode); + NodeId id = GetNewNodeId(); + uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize(); + + CNode* pnode = new CNode(id, nLocalServices, GetBestHeight(), hSocket, addr, CalculateKeyedNetGroup(addr), nonce, "", true); pnode->AddRef(); pnode->fWhitelisted = whitelisted; + GetNodeSignals().InitializeNode(pnode, *this); LogPrint("net", "connection from %s accepted\n", addr.ToString()); @@ -1050,7 +1040,7 @@ void CConnman::ThreadSocketHandler() BOOST_FOREACH(CNode* pnode, vNodesCopy) { if (pnode->fDisconnect || - (pnode->GetRefCount() <= 0 && pnode->vRecvMsg.empty() && pnode->nSendSize == 0 && pnode->ssSend.empty())) + (pnode->GetRefCount() <= 0 && pnode->vRecvMsg.empty() && pnode->nSendSize == 0)) { // remove from vNodes vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end()); @@ -1154,10 +1144,6 @@ void CConnman::ThreadSocketHandler() { TRY_LOCK(pnode->cs_vSend, lockSend); if (lockSend) { - if (pnode->nOptimisticBytesWritten) { - RecordBytesSent(pnode->nOptimisticBytesWritten); - pnode->nOptimisticBytesWritten = 0; - } if (!pnode->vSendMsg.empty()) { FD_SET(pnode->hSocket, &fdsetSend); continue; @@ -1452,6 +1438,7 @@ static std::string GetDNSHost(const CDNSSeedData& data, ServiceFlags* requiredSe return data.host; } + // See chainparams.cpp, most dnsseeds only support one or two possible servicebits hostnames return strprintf("x%x.%s", *requiredServiceBits, data.host); } @@ -1459,12 +1446,19 @@ static std::string GetDNSHost(const CDNSSeedData& data, ServiceFlags* requiredSe void CConnman::ThreadDNSAddressSeed() { // goal: only query DNS seeds if address need is acute + // Avoiding DNS seeds when we don't need them improves user privacy by + // creating fewer identifying DNS requests, reduces trust by giving seeds + // less influence on the network topology, and reduces traffic to the seeds. if ((addrman.size() > 0) && (!GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED))) { MilliSleep(11 * 1000); LOCK(cs_vNodes); - if (vNodes.size() >= 2) { + int nRelevant = 0; + for (auto pnode : vNodes) { + nRelevant += pnode->fSuccessfullyConnected && ((pnode->nServices & nRelevantServices) == nRelevantServices); + } + if (nRelevant >= 2) { LogPrintf("P2P peers available. Skipped DNS seeding.\n"); return; } @@ -1619,7 +1613,6 @@ void CConnman::ThreadOpenConnections() } } } - assert(nOutbound <= (nMaxOutbound + nMaxFeeler)); // Feeler Connections // @@ -1672,8 +1665,8 @@ void CConnman::ThreadOpenConnections() if (nANow - addr.nLastTry < 600 && nTries < 30) continue; - // only consider nodes missing relevant services after 40 failed attempts - if ((addr.nServices & nRelevantServices) != nRelevantServices && nTries < 40) + // only consider nodes missing relevant services after 40 failed attempts and only if less than half the outbound are up. + if ((addr.nServices & nRelevantServices) != nRelevantServices && (nTries < 40 || nOutbound >= (nMaxOutbound >> 1))) continue; // do not allow non-default ports, unless after 50 invalid addresses selected already @@ -2023,7 +2016,7 @@ void Discover(boost::thread_group& threadGroup) #endif } -CConnman::CConnman() +CConnman::CConnman(uint64_t nSeed0In, uint64_t nSeed1In) : nSeed0(nSeed0In), nSeed1(nSeed1In) { setBannedIsDirty = false; fAddressesInitialized = false; @@ -2046,9 +2039,7 @@ bool CConnman::Start(boost::thread_group& threadGroup, CScheduler& scheduler, st { nTotalBytesRecv = 0; nTotalBytesSent = 0; - nMaxOutboundLimit = 0; nMaxOutboundTotalBytesSentInCycle = 0; - nMaxOutboundTimeframe = 60*60*24; //1 day nMaxOutboundCycleStartTime = 0; nRelevantServices = connOptions.nRelevantServices; @@ -2060,6 +2051,9 @@ bool CConnman::Start(boost::thread_group& threadGroup, CScheduler& scheduler, st nSendBufferMaxSize = connOptions.nSendBufferMaxSize; nReceiveFloodSize = connOptions.nSendBufferMaxSize; + nMaxOutboundLimit = connOptions.nMaxOutboundLimit; + nMaxOutboundTimeframe = connOptions.nMaxOutboundTimeframe; + SetBestHeight(connOptions.nBestHeight); clientInterface = connOptions.uiInterface; @@ -2108,8 +2102,12 @@ bool CConnman::Start(boost::thread_group& threadGroup, CScheduler& scheduler, st if (pnodeLocalHost == NULL) { CNetAddr local; LookupHost("127.0.0.1", local, false); - pnodeLocalHost = new CNode(GetNewNodeId(), nLocalServices, GetBestHeight(), INVALID_SOCKET, CAddress(CService(local, 0), nLocalServices)); - GetNodeSignals().InitializeNode(pnodeLocalHost->GetId(), pnodeLocalHost); + + NodeId id = GetNewNodeId(); + uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize(); + + pnodeLocalHost = new CNode(id, nLocalServices, GetBestHeight(), INVALID_SOCKET, CAddress(CService(local, 0), nLocalServices), 0, nonce); + GetNodeSignals().InitializeNode(pnodeLocalHost, *this); } // @@ -2127,8 +2125,9 @@ bool CConnman::Start(boost::thread_group& threadGroup, CScheduler& scheduler, st // Initiate outbound connections from -addnode threadGroup.create_thread(boost::bind(&TraceThread<boost::function<void()> >, "addcon", boost::function<void()>(boost::bind(&CConnman::ThreadOpenAddedConnections, this)))); - // Initiate outbound connections - threadGroup.create_thread(boost::bind(&TraceThread<boost::function<void()> >, "opencon", boost::function<void()>(boost::bind(&CConnman::ThreadOpenConnections, this)))); + // Initiate outbound connections unless connect=0 + if (!mapArgs.count("-connect") || mapMultiArgs["-connect"].size() != 1 || mapMultiArgs["-connect"][0] != "0") + threadGroup.create_thread(boost::bind(&TraceThread<boost::function<void()> >, "opencon", boost::function<void()>(boost::bind(&CConnman::ThreadOpenConnections, this)))); // Process messages threadGroup.create_thread(boost::bind(&TraceThread<boost::function<void()> >, "msghand", boost::function<void()>(boost::bind(&CConnman::ThreadMessageHandler, this)))); @@ -2205,6 +2204,7 @@ void CConnman::DeleteNode(CNode* pnode) CConnman::~CConnman() { + Stop(); } size_t CConnman::GetAddressCount() const @@ -2362,11 +2362,7 @@ void CConnman::RecordBytesSent(uint64_t bytes) void CConnman::SetMaxOutboundTarget(uint64_t limit) { LOCK(cs_totalBytesSent); - uint64_t recommendedMinimum = (nMaxOutboundTimeframe / 600) * MAX_BLOCK_SERIALIZED_SIZE; nMaxOutboundLimit = limit; - - if (limit > 0 && limit < recommendedMinimum) - LogPrintf("Max outbound target is very small (%s bytes) and will be overshot. Recommended minimum is %s bytes.\n", nMaxOutboundLimit, recommendedMinimum); } uint64_t CConnman::GetMaxOutboundTarget() @@ -2463,50 +2459,20 @@ int CConnman::GetBestHeight() const return nBestHeight.load(std::memory_order_acquire); } -void CNode::Fuzz(int nChance) -{ - if (!fSuccessfullyConnected) return; // Don't fuzz initial handshake - if (GetRand(nChance) != 0) return; // Fuzz 1 of every nChance messages - - switch (GetRand(3)) - { - case 0: - // xor a random byte with a random value: - if (!ssSend.empty()) { - CDataStream::size_type pos = GetRand(ssSend.size()); - ssSend[pos] ^= (unsigned char)(GetRand(256)); - } - break; - case 1: - // delete a random byte: - if (!ssSend.empty()) { - CDataStream::size_type pos = GetRand(ssSend.size()); - ssSend.erase(ssSend.begin()+pos); - } - break; - case 2: - // insert a random byte at a random position - { - CDataStream::size_type pos = GetRand(ssSend.size()); - char ch = (char)GetRand(256); - ssSend.insert(ssSend.begin()+pos, ch); - } - break; - } - // Chance of more than one change half the time: - // (more changes exponentially less likely): - Fuzz(2); -} - unsigned int CConnman::GetReceiveFloodSize() const { return nReceiveFloodSize; } unsigned int CConnman::GetSendBufferSize() const{ return nSendBufferMaxSize; } -CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress& addrIn, const std::string& addrNameIn, bool fInboundIn) : - ssSend(SER_NETWORK, INIT_PROTO_VERSION), +CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn, SOCKET hSocketIn, const CAddress& addrIn, uint64_t nKeyedNetGroupIn, uint64_t nLocalHostNonceIn, const std::string& addrNameIn, bool fInboundIn) : addr(addrIn), - nKeyedNetGroup(CalculateKeyedNetGroup(addrIn)), + fInbound(fInboundIn), + id(idIn), + nKeyedNetGroup(nKeyedNetGroupIn), addrKnown(5000, 0.001), - filterInventoryKnown(50000, 0.000001) + filterInventoryKnown(50000, 0.000001), + nLocalHostNonce(nLocalHostNonceIn), + nLocalServices(nLocalServicesIn), + nMyStartingHeight(nMyStartingHeightIn), + nSendVersion(0) { nServices = NODE_NONE; nServicesExpected = NODE_NONE; @@ -2525,7 +2491,6 @@ CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn fOneShot = false; fClient = false; // set by version message fFeeler = false; - fInbound = fInboundIn; fNetworkNode = false; fSuccessfullyConnected = false; fDisconnect = false; @@ -2554,12 +2519,6 @@ CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn minFeeFilter = 0; lastSentFeeFilter = 0; nextSendTimeFeeFilter = 0; - id = idIn; - nOptimisticBytesWritten = 0; - nLocalServices = nLocalServicesIn; - - GetRandBytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce)); - nMyStartingHeight = nMyStartingHeightIn; BOOST_FOREACH(const std::string &msg, getAllNetMessageTypes()) mapRecvBytesPerMsgCmd[msg] = 0; @@ -2569,10 +2528,6 @@ CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn LogPrint("net", "Added connection to %s peer=%d\n", addrName, id); else LogPrint("net", "Added connection peer=%d\n", id); - - // Be shy and don't send version until we hear - if (hSocket != INVALID_SOCKET && !fInbound) - PushVersion(); } CNode::~CNode() @@ -2617,67 +2572,50 @@ void CNode::AskFor(const CInv& inv) mapAskFor.insert(std::make_pair(nRequestTime, inv)); } -void CNode::BeginMessage(const char* pszCommand) EXCLUSIVE_LOCK_FUNCTION(cs_vSend) +CDataStream CConnman::BeginMessage(CNode* pnode, int nVersion, int flags, const std::string& sCommand) { - ENTER_CRITICAL_SECTION(cs_vSend); - assert(ssSend.size() == 0); - ssSend << CMessageHeader(Params().MessageStart(), pszCommand, 0); - LogPrint("net", "sending: %s ", SanitizeString(pszCommand)); + return {SER_NETWORK, (nVersion ? nVersion : pnode->GetSendVersion()) | flags, CMessageHeader(Params().MessageStart(), sCommand.c_str(), 0) }; } -void CNode::AbortMessage() UNLOCK_FUNCTION(cs_vSend) +void CConnman::EndMessage(CDataStream& strm) { - ssSend.clear(); - - LEAVE_CRITICAL_SECTION(cs_vSend); + // Set the size + assert(strm.size () >= CMessageHeader::HEADER_SIZE); + unsigned int nSize = strm.size() - CMessageHeader::HEADER_SIZE; + WriteLE32((uint8_t*)&strm[CMessageHeader::MESSAGE_SIZE_OFFSET], nSize); + // Set the checksum + uint256 hash = Hash(strm.begin() + CMessageHeader::HEADER_SIZE, strm.end()); + memcpy((char*)&strm[CMessageHeader::CHECKSUM_OFFSET], hash.begin(), CMessageHeader::CHECKSUM_SIZE); - LogPrint("net", "(aborted)\n"); } -void CNode::EndMessage(const char* pszCommand) UNLOCK_FUNCTION(cs_vSend) +void CConnman::PushMessage(CNode* pnode, CDataStream& strm, const std::string& sCommand) { - // The -*messagestest options are intentionally not documented in the help message, - // since they are only used during development to debug the networking code and are - // not intended for end-users. - if (mapArgs.count("-dropmessagestest") && GetRand(GetArg("-dropmessagestest", 2)) == 0) - { - LogPrint("net", "dropmessages DROPPING SEND MESSAGE\n"); - AbortMessage(); - return; - } - if (mapArgs.count("-fuzzmessagestest")) - Fuzz(GetArg("-fuzzmessagestest", 10)); - - if (ssSend.size() == 0) - { - LEAVE_CRITICAL_SECTION(cs_vSend); + if(strm.empty()) return; - } - // Set the size - unsigned int nSize = ssSend.size() - CMessageHeader::HEADER_SIZE; - WriteLE32((uint8_t*)&ssSend[CMessageHeader::MESSAGE_SIZE_OFFSET], nSize); - - //log total amount of bytes per command - mapSendBytesPerMsgCmd[std::string(pszCommand)] += nSize + CMessageHeader::HEADER_SIZE; - - // Set the checksum - uint256 hash = Hash(ssSend.begin() + CMessageHeader::HEADER_SIZE, ssSend.end()); - unsigned int nChecksum = 0; - memcpy(&nChecksum, &hash, sizeof(nChecksum)); - assert(ssSend.size () >= CMessageHeader::CHECKSUM_OFFSET + sizeof(nChecksum)); - memcpy((char*)&ssSend[CMessageHeader::CHECKSUM_OFFSET], &nChecksum, sizeof(nChecksum)); - LogPrint("net", "(%d bytes) peer=%d\n", nSize, id); + unsigned int nSize = strm.size() - CMessageHeader::HEADER_SIZE; + LogPrint("net", "sending %s (%d bytes) peer=%d\n", SanitizeString(sCommand.c_str()), nSize, pnode->id); - std::deque<CSerializeData>::iterator it = vSendMsg.insert(vSendMsg.end(), CSerializeData()); - ssSend.GetAndClear(*it); - nSendSize += (*it).size(); + size_t nBytesSent = 0; + { + LOCK(pnode->cs_vSend); + if(pnode->hSocket == INVALID_SOCKET) { + return; + } + bool optimisticSend(pnode->vSendMsg.empty()); + pnode->vSendMsg.emplace_back(strm.begin(), strm.end()); - // If write queue empty, attempt "optimistic write" - if (it == vSendMsg.begin()) - nOptimisticBytesWritten += SocketSendData(this); + //log total amount of bytes per command + pnode->mapSendBytesPerMsgCmd[sCommand] += strm.size(); + pnode->nSendSize += strm.size(); - LEAVE_CRITICAL_SECTION(cs_vSend); + // If write queue empty, attempt "optimistic write" + if (optimisticSend == true) + nBytesSent = SocketSendData(pnode); + } + if (nBytesSent) + RecordBytesSent(nBytesSent); } bool CConnman::ForNode(NodeId id, std::function<bool(CNode* pnode)> func) @@ -2697,12 +2635,14 @@ int64_t PoissonNextSend(int64_t nNow, int average_interval_seconds) { return nNow + (int64_t)(log1p(GetRand(1ULL << 48) * -0.0000000000000035527136788 /* -1/2^48 */) * average_interval_seconds * -1000000.0 + 0.5); } -/* static */ uint64_t CNode::CalculateKeyedNetGroup(const CAddress& ad) +CSipHasher CConnman::GetDeterministicRandomizer(uint64_t id) { - static const uint64_t k0 = GetRand(std::numeric_limits<uint64_t>::max()); - static const uint64_t k1 = GetRand(std::numeric_limits<uint64_t>::max()); + return CSipHasher(nSeed0, nSeed1).Write(id); +} +uint64_t CConnman::CalculateKeyedNetGroup(const CAddress& ad) +{ std::vector<unsigned char> vchNetGroup(ad.GetGroup()); - return CSipHasher(k0, k1).Write(&vchNetGroup[0], vchNetGroup.size()).Finalize(); + return GetDeterministicRandomizer(RANDOMIZER_ID_NETGROUP).Write(&vchNetGroup[0], vchNetGroup.size()).Finalize(); } |