diff --git a/src/init.cpp b/src/init.cpp index 16a2bb80f5..91941ba9ca 100644 --- a/src/init.cpp +++ b/src/init.cpp @@ -487,12 +487,12 @@ std::string HelpMessage(HelpMessageMode mode) strUsage += HelpMessageOpt("-spentindex", strprintf(_("Maintain a full spent index, used to query the spending txid and input index for an outpoint (default: %u)"), DEFAULT_SPENTINDEX)); strUsage += HelpMessageGroup(_("Connection options:")); - strUsage += HelpMessageOpt("-addnode=", _("Add a node to connect to and attempt to keep the connection open")); + strUsage += HelpMessageOpt("-addnode=", _("Add a node to connect to and attempt to keep the connection open (see the `addnode` RPC command help for more info)")); strUsage += HelpMessageOpt("-allowprivatenet", strprintf(_("Allow RFC1918 addresses to be relayed and connected to (default: %u)"), DEFAULT_ALLOWPRIVATENET)); strUsage += HelpMessageOpt("-banscore=", strprintf(_("Threshold for disconnecting misbehaving peers (default: %u)"), DEFAULT_BANSCORE_THRESHOLD)); strUsage += HelpMessageOpt("-bantime=", strprintf(_("Number of seconds to keep misbehaving peers from reconnecting (default: %u)"), DEFAULT_MISBEHAVING_BANTIME)); strUsage += HelpMessageOpt("-bind=", _("Bind to given address and always listen on it. Use [host]:port notation for IPv6")); - strUsage += HelpMessageOpt("-connect=", _("Connect only to the specified node(s); -connect=0 disables automatic connections")); + strUsage += HelpMessageOpt("-connect=", _("Connect only to the specified node(s); -connect=0 disables automatic connections (the rules for this peer are the same as for -addnode)")); strUsage += HelpMessageOpt("-discover", _("Discover own IP addresses (default: 1 when listening and no -externalip or -proxy)")); strUsage += HelpMessageOpt("-dns", _("Allow DNS lookups for -addnode, -seednode and -connect") + " " + strprintf(_("(default: %u)"), DEFAULT_NAME_LOOKUP)); strUsage += HelpMessageOpt("-dnsseed", _("Query for peer addresses via DNS lookup, if low on addresses (default: 1 unless -connect used)")); @@ -1016,7 +1016,6 @@ void InitLogging() namespace { // Variables internal to initialization process only -ServiceFlags nRelevantServices = NODE_NETWORK; int nMaxConnections; int nUserMaxConnections; int nFD; @@ -2122,7 +2121,6 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler) CConnman::Options connOptions; connOptions.nLocalServices = nLocalServices; - connOptions.nRelevantServices = nRelevantServices; connOptions.nMaxConnections = nMaxConnections; connOptions.nMaxOutbound = std::min(MAX_OUTBOUND_CONNECTIONS, connOptions.nMaxConnections); connOptions.nMaxAddnode = MAX_ADDNODE_CONNECTIONS; diff --git a/src/net.cpp b/src/net.cpp index 1160f278d7..009a60f068 100644 --- a/src/net.cpp +++ b/src/net.cpp @@ -436,7 +436,6 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize(); CAddress addr_bind = GetBindAddress(hSocket); CNode* pnode = new CNode(id, nLocalServices, GetBestHeight(), hSocket, addrConnect, CalculateKeyedNetGroup(addrConnect), nonce, addr_bind, pszDest ? pszDest : "", false); - pnode->nServicesExpected = ServiceFlags(addrConnect.nServices & nRelevantServices); pnode->AddRef(); @@ -688,7 +687,7 @@ void CNode::copyStats(CNodeStats &stats) X(cleanSubVer); } X(fInbound); - X(fAddnode); + X(m_manual_connection); X(nStartingHeight); { LOCK(cs_vSend); @@ -1026,7 +1025,7 @@ bool CConnman::AttemptToEvictConnection() NodeEvictionCandidate candidate = {node->GetId(), node->nTimeConnected, node->nMinPingUsecTime, node->nLastBlockTime, node->nLastTXTime, - (node->nServices & nRelevantServices) == nRelevantServices, + HasAllDesirableServiceFlags(node->nServices), node->fRelayTxes, node->pfilter != nullptr, node->nKeyedNetGroup}; vEvictionCandidates.push_back(candidate); } @@ -1717,7 +1716,7 @@ void CConnman::ThreadDNSAddressSeed() LOCK(cs_vNodes); int nRelevant = 0; for (auto pnode : vNodes) { - nRelevant += pnode->fSuccessfullyConnected && ((pnode->nServices & nRelevantServices) == nRelevantServices); + nRelevant += pnode->fSuccessfullyConnected && !pnode->fFeeler && !pnode->fOneShot && !pnode->m_manual_connection && !pnode->fInbound; } if (nRelevant >= 2) { LogPrintf("P2P peers available. Skipped DNS seeding.\n"); @@ -1739,7 +1738,7 @@ void CConnman::ThreadDNSAddressSeed() } else { std::vector vIPs; std::vector vAdd; - ServiceFlags requiredServiceBits = nRelevantServices; + ServiceFlags requiredServiceBits = GetDesirableServiceFlags(NODE_NONE); std::string host = GetDNSHost(seed, &requiredServiceBits); CNetAddr resolveSource; if (!resolveSource.SetInternal(host)) { @@ -1820,7 +1819,7 @@ void CConnman::ThreadOpenConnections() for (const std::string& strAddr : gArgs.GetArgs("-connect")) { CAddress addr(CService(), NODE_NONE); - OpenNetworkConnection(addr, false, nullptr, strAddr.c_str()); + OpenNetworkConnection(addr, false, nullptr, strAddr.c_str(), false, false, true); for (int i = 0; i < 10 && i < nLoop; i++) { if (!interruptNet.sleep_for(std::chrono::milliseconds(500))) @@ -1869,17 +1868,11 @@ void CConnman::ThreadOpenConnections() // Do this here so we don't have to critsect vNodes inside mapAddresses critsect. // This is only done for mainnet and testnet int nOutbound = 0; - int nOutboundRelevant = 0; std::set > setConnected; if (!Params().AllowMultipleAddressesFromGroup()) { LOCK(cs_vNodes); for (CNode* pnode : vNodes) { - if (!pnode->fInbound && !pnode->fAddnode && !pnode->fMasternode) { - - // Count the peers that have all relevant services - if (pnode->fSuccessfullyConnected && !pnode->fFeeler && ((pnode->nServices & nRelevantServices) == nRelevantServices)) { - nOutboundRelevant++; - } + if (!pnode->fInbound && !pnode->fMasternode && !pnode->m_manual_connection) { // Netgroups for inbound and addnode peers are not excluded because our goal here // is to not use multiple of our limited outbound slots on a single netgroup // but inbound and addnode peers do not use our outbound slots. Inbound peers @@ -1943,21 +1936,16 @@ void CConnman::ThreadOpenConnections() if (IsLimited(addr)) continue; - // only connect to full nodes - if (!isMasternode && (addr.nServices & REQUIRED_SERVICES) != REQUIRED_SERVICES) - continue; - // only consider very recently tried nodes after 30 failed attempts if (nANow - addr.nLastTry < 600 && nTries < 30) continue; - // only consider nodes missing relevant services after 40 failed attempts and only if less than half the outbound are up. - ServiceFlags nRequiredServices = nRelevantServices; - if (nTries >= 40 && nOutbound < (nMaxOutbound >> 1)) { - nRequiredServices = REQUIRED_SERVICES; - } - - if (!isMasternode && (addr.nServices & nRequiredServices) != nRequiredServices) { + // for non-feelers, require all the services we'll want, + // for feelers, only require they be a full node (only because most + // SPV clients don't have a good address DB available) + if (!isMasternode && !fFeeler && !HasAllDesirableServiceFlags(addr.nServices)) { + continue; + } else if (!isMasternode && fFeeler && !MayHaveUsefulAddressDB(addr.nServices)) { continue; } @@ -1966,13 +1954,6 @@ void CConnman::ThreadOpenConnections() continue; addrConnect = addr; - - // regardless of the services assumed to be available, only require the minimum if half or more outbound have relevant services - if (nOutboundRelevant >= (nMaxOutbound >> 1)) { - addrConnect.nServices = REQUIRED_SERVICES; - } else { - addrConnect.nServices = nRequiredServices; - } break; } @@ -2165,7 +2146,7 @@ void CConnman::ThreadOpenMasternodeConnections() } // if successful, this moves the passed grant to the constructed node -bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot, bool fFeeler, bool fAddnode, bool fConnectToMasternode) +bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, bool fOneShot, bool fFeeler, bool manual_connection, bool fConnectToMasternode) { // // Initiate outbound network connection @@ -2201,8 +2182,8 @@ bool CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFai pnode->fOneShot = true; if (fFeeler) pnode->fFeeler = true; - if (fAddnode) - pnode->fAddnode = true; + if (manual_connection) + pnode->m_manual_connection = true; if (fConnectToMasternode) pnode->fMasternode = true; @@ -3138,7 +3119,6 @@ CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn nSendVersion(0) { nServices = NODE_NONE; - nServicesExpected = NODE_NONE; hSocket = hSocketIn; nRecvVersion = INIT_PROTO_VERSION; nLastSend = 0; @@ -3153,7 +3133,7 @@ CNode::CNode(NodeId idIn, ServiceFlags nLocalServicesIn, int nMyStartingHeightIn strSubVer = ""; fWhitelisted = false; fOneShot = false; - fAddnode = false; + m_manual_connection = false; fClient = false; // set by version message fFeeler = false; fSuccessfullyConnected = false; diff --git a/src/net.h b/src/net.h index b3fd255a7e..5f11017cdb 100644 --- a/src/net.h +++ b/src/net.h @@ -111,8 +111,6 @@ static const bool DEFAULT_FORCEDNSSEED = false; static const size_t DEFAULT_MAXRECEIVEBUFFER = 5 * 1000; static const size_t DEFAULT_MAXSENDBUFFER = 1 * 1000; -static const ServiceFlags REQUIRED_SERVICES = NODE_NETWORK; - // NOTE: When adjusting this, update rpcnet:setban's help ("24h") static const unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24; // Default 24-hour ban @@ -157,7 +155,6 @@ public: struct Options { ServiceFlags nLocalServices = NODE_NONE; - ServiceFlags nRelevantServices = NODE_NONE; int nMaxConnections = 0; int nMaxOutbound = 0; int nMaxAddnode = 0; @@ -175,7 +172,6 @@ public: void Init(const Options& connOptions) { nLocalServices = connOptions.nLocalServices; - nRelevantServices = connOptions.nRelevantServices; nMaxConnections = connOptions.nMaxConnections; nMaxOutbound = std::min(connOptions.nMaxOutbound, connOptions.nMaxConnections); nMaxAddnode = connOptions.nMaxAddnode; @@ -196,7 +192,7 @@ public: void Interrupt(); bool GetNetworkActive() const { return fNetworkActive; }; void SetNetworkActive(bool active); - bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = nullptr, const char *strDest = nullptr, bool fOneShot = false, bool fFeeler = false, bool fAddnode = false, bool fConnectToMasternode = false); + bool OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound = nullptr, const char *strDest = nullptr, bool fOneShot = false, bool fFeeler = false, bool manual_connection = false, bool fConnectToMasternode = false); bool OpenMasternodeConnection(const CAddress& addrConnect); bool CheckIncomingNonce(uint64_t nonce); @@ -532,9 +528,6 @@ private: /** Services this instance offers */ ServiceFlags nLocalServices; - /** Services this instance cares about */ - ServiceFlags nRelevantServices; - CSemaphore *semOutbound; CSemaphore *semAddnode; CSemaphore *semMasternodeOutbound; @@ -663,7 +656,7 @@ public: int nVersion; std::string cleanSubVer; bool fInbound; - bool fAddnode; + bool m_manual_connection; int nStartingHeight; uint64_t nSendBytes; mapMsgCmdSize mapSendBytesPerMsgCmd; @@ -735,7 +728,6 @@ class CNode public: // socket std::atomic nServices; - ServiceFlags nServicesExpected; SOCKET hSocket; size_t nSendSize; // total size of all vSendMsg entries size_t nSendOffset; // offset inside the first vSendMsg already sent @@ -777,7 +769,7 @@ public: bool fWhitelisted; // This peer can bypass DoS banning. bool fFeeler; // If true this node is being used as a short lived feeler. bool fOneShot; - bool fAddnode; + bool m_manual_connection; bool fClient; const bool fInbound; std::atomic_bool fSuccessfullyConnected; diff --git a/src/net_processing.cpp b/src/net_processing.cpp index 20c8064bb7..6b43e0648e 100644 --- a/src/net_processing.cpp +++ b/src/net_processing.cpp @@ -1456,11 +1456,11 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr { connman.SetServices(pfrom->addr, nServices); } - if (pfrom->nServicesExpected & ~nServices) + if (!pfrom->fInbound && !pfrom->fFeeler && !pfrom->m_manual_connection && !HasAllDesirableServiceFlags(nServices)) { - LogPrint(BCLog::NET, "peer=%d does not offer the expected services (%08x offered, %08x expected); disconnecting\n", pfrom->GetId(), nServices, pfrom->nServicesExpected); + LogPrint(BCLog::NET, "peer=%d does not offer the expected services (%08x offered, %08x expected); disconnecting\n", pfrom->GetId(), nServices, GetDesirableServiceFlags(nServices)); connman.PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::REJECT, strCommand, REJECT_NONSTANDARD, - strprintf("Expected to offer services %08x", pfrom->nServicesExpected))); + strprintf("Expected to offer services %08x", GetDesirableServiceFlags(nServices)))); pfrom->fDisconnect = true; return false; } @@ -1697,7 +1697,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr if (interruptMsgProc) return true; - if ((addr.nServices & REQUIRED_SERVICES) != REQUIRED_SERVICES) + // We only bother storing full nodes, though this may include + // things which we would not make an outbound connection to, in + // part because we may make feeler connections to them. + if (!MayHaveUsefulAddressDB(addr.nServices)) continue; if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60) @@ -3001,8 +3004,8 @@ static bool SendRejectsAndCheckIfBanned(CNode* pnode, CConnman& connman) state.fShouldBan = false; if (pnode->fWhitelisted) LogPrintf("Warning: not punishing whitelisted peer %s!\n", pnode->GetLogString()); - else if (pnode->fAddnode) - LogPrintf("Warning: not punishing addnoded peer %s!\n", pnode->GetLogString()); + else if (pnode->m_manual_connection) + LogPrintf("Warning: not punishing manually-connected peer %s!\n", pnode->GetLogString()); else { pnode->fDisconnect = true; if (pnode->addr.IsLocal()) diff --git a/src/protocol.h b/src/protocol.h index e7ee254f0a..b27c7d8285 100644 --- a/src/protocol.h +++ b/src/protocol.h @@ -306,6 +306,43 @@ enum ServiceFlags : uint64_t { // BIP process. }; +/** + * Gets the set of service flags which are "desirable" for a given peer. + * + * These are the flags which are required for a peer to support for them + * to be "interesting" to us, ie for us to wish to use one of our few + * outbound connection slots for or for us to wish to prioritize keeping + * their connection around. + * + * Relevant service flags may be peer- and state-specific in that the + * version of the peer may determine which flags are required (eg in the + * case of NODE_NETWORK_LIMITED where we seek out NODE_NETWORK peers + * unless they set NODE_NETWORK_LIMITED and we are out of IBD, in which + * case NODE_NETWORK_LIMITED suffices). + * + * Thus, generally, avoid calling with peerServices == NODE_NONE. + */ +static ServiceFlags GetDesirableServiceFlags(ServiceFlags services) { + return ServiceFlags(NODE_NETWORK | NODE_WITNESS); +} + +/** + * A shortcut for (services & GetDesirableServiceFlags(services)) + * == GetDesirableServiceFlags(services), ie determines whether the given + * set of service flags are sufficient for a peer to be "relevant". + */ +static inline bool HasAllDesirableServiceFlags(ServiceFlags services) { + return !(GetDesirableServiceFlags(services) & (~services)); +} + +/** + * Checks if a peer with the given service flags may be capable of having a + * robust address-storage DB. Currently an alias for checking NODE_NETWORK. + */ +static inline bool MayHaveUsefulAddressDB(ServiceFlags services) { + return services & NODE_NETWORK; +} + /** A CService with information about it as peer */ class CAddress : public CService { diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp index f16c2d1163..d90ddf2829 100644 --- a/src/rpc/net.cpp +++ b/src/rpc/net.cpp @@ -93,7 +93,7 @@ UniValue getpeerinfo(const JSONRPCRequest& request) " \"version\": v, (numeric) The peer version, such as 7001\n" " \"subver\": \"/Dash Core:x.x.x/\", (string) The string version\n" " \"inbound\": true|false, (boolean) Inbound (true) or Outbound (false)\n" - " \"addnode\": true|false, (boolean) Whether connection was due to addnode and is using an addnode slot\n" + " \"addnode\": true|false, (boolean) Whether connection was due to addnode/-connect or if it was an automatic/inbound connection\n" " \"startingheight\": n, (numeric) The starting height (block) of the peer\n" " \"banscore\": n, (numeric) The ban score\n" " \"synced_headers\": n, (numeric) The last header we have in common with this peer\n" @@ -157,7 +157,7 @@ UniValue getpeerinfo(const JSONRPCRequest& request) // their ver message. obj.push_back(Pair("subver", stats.cleanSubVer)); obj.push_back(Pair("inbound", stats.fInbound)); - obj.push_back(Pair("addnode", stats.fAddnode)); + obj.push_back(Pair("addnode", stats.m_manual_connection)); obj.push_back(Pair("startingheight", stats.nStartingHeight)); if (fStateStats) { obj.push_back(Pair("banscore", statestats.nMisbehavior)); @@ -202,6 +202,8 @@ UniValue addnode(const JSONRPCRequest& request) "addnode \"node\" \"add|remove|onetry\"\n" "\nAttempts to add or remove a node from the addnode list.\n" "Or try a connection to a node once.\n" + "Nodes added using addnode (or -connect) are protected from DoS disconnection and are not required to be\n" + "full nodes/support SegWit as other outbound peers are (though such peers will not be synced from).\n" "\nArguments:\n" "1. \"node\" (string, required) The node (see getpeerinfo for nodes)\n" "2. \"command\" (string, required) 'add' to add a node to the list, 'remove' to remove a node from the list, 'onetry' to try a connection to the node once\n" @@ -218,7 +220,7 @@ UniValue addnode(const JSONRPCRequest& request) if (strCommand == "onetry") { CAddress addr; - g_connman->OpenNetworkConnection(addr, false, nullptr, strNode.c_str()); + g_connman->OpenNetworkConnection(addr, false, nullptr, strNode.c_str(), false, false, true); return NullUniValue; }