diff options
Diffstat (limited to 'src/net_processing.cpp')
| -rw-r--r-- | src/net_processing.cpp | 3004 |
1 files changed, 1732 insertions, 1272 deletions
diff --git a/src/net_processing.cpp b/src/net_processing.cpp index f42a26ca3..f14db379f 100644 --- a/src/net_processing.cpp +++ b/src/net_processing.cpp @@ -1,5 +1,5 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto -// Copyright (c) 2009-2018 The Bitcoin Core developers +// Copyright (c) 2009-2020 The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. @@ -8,13 +8,14 @@ #include <addrman.h> #include <banman.h> #include <blockencodings.h> +#include <blockfilter.h> #include <chainparams.h> #include <consensus/validation.h> #include <hash.h> -#include <validation.h> +#include <index/blockfilterindex.h> #include <merkleblock.h> -#include <netmessagemaker.h> #include <netbase.h> +#include <netmessagemaker.h> #include <policy/fees.h> #include <policy/policy.h> #include <primitives/block.h> @@ -22,24 +23,25 @@ #include <random.h> #include <reverse_iterator.h> #include <scheduler.h> +#include <streams.h> #include <tinyformat.h> #include <txmempool.h> -#include <util/system.h> +#include <util/check.h> // For NDEBUG compile time check #include <util/strencodings.h> -#include <util/validation.h> +#include <util/system.h> +#include <validation.h> #include <memory> - -#if defined(NDEBUG) -# error "Bitcoin cannot be compiled without assertions." -#endif +#include <typeinfo> /** Expiration time for orphan transactions in seconds */ static constexpr int64_t ORPHAN_TX_EXPIRE_TIME = 20 * 60; /** Minimum time between orphan transactions expire time checks in seconds */ static constexpr int64_t ORPHAN_TX_EXPIRE_INTERVAL = 5 * 60; /** How long to cache transactions in mapRelay for normal relay */ -static constexpr std::chrono::seconds RELAY_TX_CACHE_TIME{15 * 60}; +static constexpr std::chrono::seconds RELAY_TX_CACHE_TIME = std::chrono::minutes{15}; +/** How long a transaction has to be in the mempool before it can unconditionally be relayed (even when not in mapRelay). */ +static constexpr std::chrono::seconds UNCONDITIONAL_RELAY_DELAY = std::chrono::minutes{2}; /** Headers download timeout expressed in microseconds * Timeout = base + per_header * (expected number of headers) */ static constexpr int64_t HEADERS_DOWNLOAD_TIMEOUT_BASE = 15 * 60 * 1000000; // 15 minutes @@ -64,23 +66,86 @@ static constexpr int STALE_RELAY_AGE_LIMIT = 30 * 24 * 60 * 60; /// Age after which a block is considered historical for purposes of rate /// limiting block relay. Set to one week, denominated in seconds. static constexpr int HISTORICAL_BLOCK_AGE = 7 * 24 * 60 * 60; -/** Maximum number of in-flight transactions from a peer */ -static constexpr int32_t MAX_PEER_TX_IN_FLIGHT = 100; -/** Maximum number of announced transactions from a peer */ -static constexpr int32_t MAX_PEER_TX_ANNOUNCEMENTS = 2 * MAX_INV_SZ; -/** How many microseconds to delay requesting transactions from inbound peers */ -static constexpr std::chrono::microseconds INBOUND_PEER_TX_DELAY{std::chrono::seconds{2}}; +/** Time between pings automatically sent out for latency probing and keepalive */ +static constexpr std::chrono::minutes PING_INTERVAL{2}; +/** The maximum number of entries in a locator */ +static const unsigned int MAX_LOCATOR_SZ = 101; +/** The maximum number of entries in an 'inv' protocol message */ +static const unsigned int MAX_INV_SZ = 50000; +/** Maximum number of in-flight transaction requests from a peer. It is not a hard limit, but the threshold at which + * point the OVERLOADED_PEER_TX_DELAY kicks in. */ +static constexpr int32_t MAX_PEER_TX_REQUEST_IN_FLIGHT = 100; +/** Maximum number of transactions to consider for requesting, per peer. It provides a reasonable DoS limit to + * per-peer memory usage spent on announcements, while covering peers continuously sending INVs at the maximum + * rate (by our own policy, see INVENTORY_BROADCAST_PER_SECOND) for several minutes, while not receiving + * the actual transaction (from any peer) in response to requests for them. */ +static constexpr int32_t MAX_PEER_TX_ANNOUNCEMENTS = 5000; +/** How long to delay requesting transactions via txids, if we have wtxid-relaying peers */ +static constexpr auto TXID_RELAY_DELAY = std::chrono::seconds{2}; +/** How long to delay requesting transactions from non-preferred peers */ +static constexpr auto NONPREF_PEER_TX_DELAY = std::chrono::seconds{2}; +/** How long to delay requesting transactions from overloaded peers (see MAX_PEER_TX_REQUEST_IN_FLIGHT). */ +static constexpr auto OVERLOADED_PEER_TX_DELAY = std::chrono::seconds{2}; /** How long to wait (in microseconds) before downloading a transaction from an additional peer */ static constexpr std::chrono::microseconds GETDATA_TX_INTERVAL{std::chrono::seconds{60}}; -/** Maximum delay (in microseconds) for transaction requests to avoid biasing some peers over others. */ -static constexpr std::chrono::microseconds MAX_GETDATA_RANDOM_DELAY{std::chrono::seconds{2}}; -/** How long to wait (in microseconds) before expiring an in-flight getdata request to a peer */ -static constexpr std::chrono::microseconds TX_EXPIRY_INTERVAL{GETDATA_TX_INTERVAL * 10}; -static_assert(INBOUND_PEER_TX_DELAY >= MAX_GETDATA_RANDOM_DELAY, -"To preserve security, MAX_GETDATA_RANDOM_DELAY should not exceed INBOUND_PEER_DELAY"); /** Limit to avoid sending big packets. Not used in processing incoming GETDATA for compatibility */ static const unsigned int MAX_GETDATA_SZ = 1000; - +/** Number of blocks that can be requested at any given time from a single peer. */ +static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 16; +/** Timeout in seconds during which a peer must stall block download progress before being disconnected. */ +static const unsigned int BLOCK_STALLING_TIMEOUT = 2; +/** Number of headers sent in one getheaders result. We rely on the assumption that if a peer sends + * less than this number, we reached its tip. Changing this value is a protocol upgrade. */ +static const unsigned int MAX_HEADERS_RESULTS = 2000; +/** Maximum depth of blocks we're willing to serve as compact blocks to peers + * when requested. For older blocks, a regular BLOCK response will be sent. */ +static const int MAX_CMPCTBLOCK_DEPTH = 5; +/** Maximum depth of blocks we're willing to respond to GETBLOCKTXN requests for. */ +static const int MAX_BLOCKTXN_DEPTH = 10; +/** Size of the "block download window": how far ahead of our current height do we fetch? + * Larger windows tolerate larger download speed differences between peer, but increase the potential + * degree of disordering of blocks on disk (which make reindexing and pruning harder). We'll probably + * want to make this a per-peer adaptive value at some point. */ +static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024; +/** Block download timeout base, expressed in millionths of the block interval (i.e. 10 min) */ +static const int64_t BLOCK_DOWNLOAD_TIMEOUT_BASE = 1000000; +/** Additional block download timeout per parallel downloading peer (i.e. 5 min) */ +static const int64_t BLOCK_DOWNLOAD_TIMEOUT_PER_PEER = 500000; +/** Maximum number of headers to announce when relaying blocks with headers message.*/ +static const unsigned int MAX_BLOCKS_TO_ANNOUNCE = 8; +/** Maximum number of unconnecting headers announcements before DoS score */ +static const int MAX_UNCONNECTING_HEADERS = 10; +/** Minimum blocks required to signal NODE_NETWORK_LIMITED */ +static const unsigned int NODE_NETWORK_LIMITED_MIN_BLOCKS = 288; +/** Average delay between local address broadcasts */ +static constexpr std::chrono::hours AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL{24}; +/** Average delay between peer address broadcasts */ +static constexpr std::chrono::seconds AVG_ADDRESS_BROADCAST_INTERVAL{30}; +/** Average delay between trickled inventory transmissions in seconds. + * Blocks and peers with noban permission bypass this, outbound peers get half this delay. */ +static const unsigned int INVENTORY_BROADCAST_INTERVAL = 5; +/** Maximum rate of inventory items to send per second. + * Limits the impact of low-fee transaction floods. */ +static constexpr unsigned int INVENTORY_BROADCAST_PER_SECOND = 7; +/** Maximum number of inventory items to send per transmission. */ +static constexpr unsigned int INVENTORY_BROADCAST_MAX = INVENTORY_BROADCAST_PER_SECOND * INVENTORY_BROADCAST_INTERVAL; +/** The number of most recently announced transactions a peer can request. */ +static constexpr unsigned int INVENTORY_MAX_RECENT_RELAY = 3500; +/** Verify that INVENTORY_MAX_RECENT_RELAY is enough to cache everything typically + * relayed before unconditional relay from the mempool kicks in. This is only a + * lower bound, and it should be larger to account for higher inv rate to outbound + * peers, and random variations in the broadcast mechanism. */ +static_assert(INVENTORY_MAX_RECENT_RELAY >= INVENTORY_BROADCAST_PER_SECOND * UNCONDITIONAL_RELAY_DELAY / std::chrono::seconds{1}, "INVENTORY_RELAY_MAX too low"); +/** Average delay between feefilter broadcasts in seconds. */ +static constexpr unsigned int AVG_FEEFILTER_BROADCAST_INTERVAL = 10 * 60; +/** Maximum feefilter broadcast delay after significant change. */ +static constexpr unsigned int MAX_FEEFILTER_CHANGE_DELAY = 5 * 60; +/** Maximum number of compact filters that may be requested with one getcfilters. See BIP 157. */ +static constexpr uint32_t MAX_GETCFILTERS_SIZE = 1000; +/** Maximum number of cf hashes that may be requested with one getcfheaders. See BIP 157. */ +static constexpr uint32_t MAX_GETCFHEADERS_SIZE = 2000; +/** the maximum percentage of addresses from our addrman to return in response to a getaddr message. */ +static constexpr size_t MAX_PCT_ADDR_TO_SEND = 23; struct COrphanTx { // When modifying, adapt the copy of this definition in tests/DoS_tests. @@ -89,29 +154,18 @@ struct COrphanTx { int64_t nTimeExpire; size_t list_pos; }; -CCriticalSection g_cs_orphans; + +/** Guards orphan transactions and extra txs for compact blocks */ +RecursiveMutex g_cs_orphans; +/** Map from txid to orphan transaction record. Limited by + * -maxorphantx/DEFAULT_MAX_ORPHAN_TRANSACTIONS */ std::map<uint256, COrphanTx> mapOrphanTransactions GUARDED_BY(g_cs_orphans); +/** Index from wtxid into the mapOrphanTransactions to lookup orphan + * transactions using their witness ids. */ +std::map<uint256, std::map<uint256, COrphanTx>::iterator> g_orphans_by_wtxid GUARDED_BY(g_cs_orphans); void EraseOrphansFor(NodeId peer); -/** Increase a node's misbehavior score. */ -void Misbehaving(NodeId nodeid, int howmuch, const std::string& message="") EXCLUSIVE_LOCKS_REQUIRED(cs_main); - -/** Average delay between local address broadcasts in seconds. */ -static constexpr unsigned int AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL = 24 * 60 * 60; -/** Average delay between peer address broadcasts in seconds. */ -static const unsigned int AVG_ADDRESS_BROADCAST_INTERVAL = 30; -/** Average delay between trickled inventory transmissions in seconds. - * Blocks and whitelisted receivers bypass this, outbound peers get half this delay. */ -static const unsigned int INVENTORY_BROADCAST_INTERVAL = 5; -/** Maximum number of inventory items to send per transmission. - * Limits the impact of low-fee transaction floods. */ -static constexpr unsigned int INVENTORY_BROADCAST_MAX = 7 * INVENTORY_BROADCAST_INTERVAL; -/** Average delay between feefilter broadcasts in seconds. */ -static constexpr unsigned int AVG_FEEFILTER_BROADCAST_INTERVAL = 10 * 60; -/** Maximum feefilter broadcast delay after significant change. */ -static constexpr unsigned int MAX_FEEFILTER_CHANGE_DELAY = 5 * 60; - // Internal stuff namespace { /** Number of nodes with fSyncStarted. */ @@ -142,11 +196,34 @@ namespace { * million to make it highly unlikely for users to have issues with this * filter. * + * We typically only add wtxids to this filter. For non-segwit + * transactions, the txid == wtxid, so this only prevents us from + * re-downloading non-segwit transactions when communicating with + * non-wtxidrelay peers -- which is important for avoiding malleation + * attacks that could otherwise interfere with transaction relay from + * non-wtxidrelay peers. For communicating with wtxidrelay peers, having + * the reject filter store wtxids is exactly what we want to avoid + * redownload of a rejected transaction. + * + * In cases where we can tell that a segwit transaction will fail + * validation no matter the witness, we may add the txid of such + * transaction to the filter as well. This can be helpful when + * communicating with txid-relay peers or if we were to otherwise fetch a + * transaction via txid (eg in our orphan handling). + * * Memory used: 1.3 MB */ std::unique_ptr<CRollingBloomFilter> recentRejects GUARDED_BY(cs_main); uint256 hashRecentRejectsChainTip GUARDED_BY(cs_main); + /* + * Filter for transactions that have been recently confirmed. + * We use this to avoid requesting transactions that have already been + * confirnmed. + */ + Mutex g_cs_recent_confirmed_transactions; + std::unique_ptr<CRollingBloomFilter> g_recent_confirmed_transactions GUARDED_BY(g_cs_recent_confirmed_transactions); + /** Blocks that are in flight, and that are in the queue to be downloaded. */ struct QueuedBlock { uint256 hash; @@ -165,13 +242,16 @@ namespace { /** Number of peers from which we're downloading blocks. */ int nPeersWithValidatedDownloads GUARDED_BY(cs_main) = 0; + /** Number of peers with wtxid relay. */ + int g_wtxid_relay_peers GUARDED_BY(cs_main) = 0; + /** Number of outbound peers with m_chain_sync.m_protect. */ int g_outbound_peers_with_protect_from_disconnect GUARDED_BY(cs_main) = 0; /** When our tip was last updated. */ std::atomic<int64_t> g_last_tip_update(0); - /** Relay map */ + /** Relay map (txid or wtxid -> CTransactionRef) */ typedef std::map<uint256, CTransactionRef> MapRelay; MapRelay mapRelay GUARDED_BY(cs_main); /** Expiration-time ordered list of (expire time, relay map entry) pairs. */ @@ -185,12 +265,19 @@ namespace { return &(*a) < &(*b); } }; - std::map<COutPoint, std::set<std::map<uint256, COrphanTx>::iterator, IteratorComparator>> mapOrphanTransactionsByPrev GUARDED_BY(g_cs_orphans); - std::vector<std::map<uint256, COrphanTx>::iterator> g_orphan_list GUARDED_BY(g_cs_orphans); //! For random eviction + /** Index from the parents' COutPoint into the mapOrphanTransactions. Used + * to remove orphan transactions from the mapOrphanTransactions */ + std::map<COutPoint, std::set<std::map<uint256, COrphanTx>::iterator, IteratorComparator>> mapOrphanTransactionsByPrev GUARDED_BY(g_cs_orphans); + /** Orphan transactions in vector for quick random eviction */ + std::vector<std::map<uint256, COrphanTx>::iterator> g_orphan_list GUARDED_BY(g_cs_orphans); - static size_t vExtraTxnForCompactIt GUARDED_BY(g_cs_orphans) = 0; + /** Orphan/conflicted/etc transactions that are kept for compact block reconstruction. + * The last -blockreconstructionextratxn/DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN of + * these are kept in a ring buffer */ static std::vector<std::pair<uint256, CTransactionRef>> vExtraTxnForCompact GUARDED_BY(g_cs_orphans); + /** Offset into vExtraTxnForCompact to insert the next tx */ + static size_t vExtraTxnForCompactIt GUARDED_BY(g_cs_orphans) = 0; } // namespace namespace { @@ -205,12 +292,6 @@ struct CNodeState { const CService address; //! Whether we have a fully established connection. bool fCurrentlyConnected; - //! Accumulated misbehaviour score for this peer. - int nMisbehavior; - //! Whether this peer should be disconnected and banned (unless whitelisted). - bool fShouldBan; - //! String name of this peer (debugging/logging purposes). - const std::string name; //! The best known block we know this peer has announced. const CBlockIndex *pindexBestKnownBlock; //! The hash of the last unknown block this peer has announced. @@ -254,10 +335,17 @@ struct CNodeState { */ bool fSupportsDesiredCmpctVersion; - /** State used to enforce CHAIN_SYNC_TIMEOUT - * Only in effect for outbound, non-manual, full-relay connections, with - * m_protect == false - * Algorithm: if a peer's best known block has less work than our tip, + /** State used to enforce CHAIN_SYNC_TIMEOUT and EXTRA_PEER_CHECK_INTERVAL logic. + * + * Both are only in effect for outbound, non-manual, non-protected connections. + * Any peer protected (m_protect = true) is not chosen for eviction. A peer is + * marked as protected if all of these are true: + * - its connection type is IsBlockOnlyConn() == false + * - it gave us a valid connecting header + * - we haven't reached MAX_OUTBOUND_PEERS_TO_PROTECT_FROM_DISCONNECT yet + * - it has a better chain than we have + * + * CHAIN_SYNC_TIMEOUT: if a peer's best known block has less work than our tip, * set a timeout CHAIN_SYNC_TIMEOUT seconds in the future: * - If at timeout their best known block now has more work than our tip * when the timeout was set, then either reset the timeout or clear it @@ -267,6 +355,9 @@ struct CNodeState { * and set a shorter timeout, HEADERS_RESPONSE_TIME seconds in future. * If their best known block is still behind when that new timeout is * reached, disconnect. + * + * EXTRA_PEER_CHECK_INTERVAL: after each interval, if we have too many outbound peers, + * drop the outbound one that least recently announced us a new block. */ struct ChainSyncTimeoutState { //! A timeout used for checking whether our peer has sufficiently synced @@ -284,82 +375,22 @@ struct CNodeState { //! Time of last new block announcement int64_t m_last_block_announcement; - /* - * State associated with transaction download. - * - * Tx download algorithm: - * - * When inv comes in, queue up (process_time, txid) inside the peer's - * CNodeState (m_tx_process_time) as long as m_tx_announced for the peer - * isn't too big (MAX_PEER_TX_ANNOUNCEMENTS). - * - * The process_time for a transaction is set to nNow for outbound peers, - * nNow + 2 seconds for inbound peers. This is the time at which we'll - * consider trying to request the transaction from the peer in - * SendMessages(). The delay for inbound peers is to allow outbound peers - * a chance to announce before we request from inbound peers, to prevent - * an adversary from using inbound connections to blind us to a - * transaction (InvBlock). - * - * When we call SendMessages() for a given peer, - * we will loop over the transactions in m_tx_process_time, looking - * at the transactions whose process_time <= nNow. We'll request each - * such transaction that we don't have already and that hasn't been - * requested from another peer recently, up until we hit the - * MAX_PEER_TX_IN_FLIGHT limit for the peer. Then we'll update - * g_already_asked_for for each requested txid, storing the time of the - * GETDATA request. We use g_already_asked_for to coordinate transaction - * requests amongst our peers. - * - * For transactions that we still need but we have already recently - * requested from some other peer, we'll reinsert (process_time, txid) - * back into the peer's m_tx_process_time at the point in the future at - * which the most recent GETDATA request would time out (ie - * GETDATA_TX_INTERVAL + the request time stored in g_already_asked_for). - * We add an additional delay for inbound peers, again to prefer - * attempting download from outbound peers first. - * We also add an extra small random delay up to 2 seconds - * to avoid biasing some peers over others. (e.g., due to fixed ordering - * of peer processing in ThreadMessageHandler). - * - * When we receive a transaction from a peer, we remove the txid from the - * peer's m_tx_in_flight set and from their recently announced set - * (m_tx_announced). We also clear g_already_asked_for for that entry, so - * that if somehow the transaction is not accepted but also not added to - * the reject filter, then we will eventually redownload from other - * peers. - */ - struct TxDownloadState { - /* Track when to attempt download of announced transactions (process - * time in micros -> txid) - */ - std::multimap<std::chrono::microseconds, uint256> m_tx_process_time; - - //! Store all the transactions a peer has recently announced - std::set<uint256> m_tx_announced; - - //! Store transactions which were requested by us, with timestamp - std::map<uint256, std::chrono::microseconds> m_tx_in_flight; - - //! Periodically check for stuck getdata requests - std::chrono::microseconds m_check_expiry_timer{0}; - }; - - TxDownloadState m_tx_download; - //! Whether this peer is an inbound connection bool m_is_inbound; //! Whether this peer is a manual connection bool m_is_manual_connection; - CNodeState(CAddress addrIn, std::string addrNameIn, bool is_inbound, bool is_manual) : - address(addrIn), name(std::move(addrNameIn)), m_is_inbound(is_inbound), - m_is_manual_connection (is_manual) + //! A rolling bloom filter of all announced tx CInvs to this peer. + CRollingBloomFilter m_recently_announced_invs = CRollingBloomFilter{INVENTORY_MAX_RECENT_RELAY, 0.000001}; + + //! Whether this peer relays txs via wtxid + bool m_wtxid_relay{false}; + + CNodeState(CAddress addrIn, bool is_inbound, bool is_manual) + : address(addrIn), m_is_inbound(is_inbound), m_is_manual_connection(is_manual) { fCurrentlyConnected = false; - nMisbehavior = 0; - fShouldBan = false; pindexBestKnownBlock = nullptr; hashLastUnknownBlock.SetNull(); pindexLastCommonBlock = nullptr; @@ -380,12 +411,10 @@ struct CNodeState { fSupportsDesiredCmpctVersion = false; m_chain_sync = { 0, nullptr, false, false }; m_last_block_announcement = 0; + m_recently_announced_invs.reset(); } }; -// Keeps track of the time (in microseconds) when transactions were requested last time -limitedmap<uint256, std::chrono::microseconds> g_already_asked_for GUARDED_BY(cs_main)(MAX_INV_SZ); - /** Map maintaining per-node state. */ static std::map<NodeId, CNodeState> mapNodeState GUARDED_BY(cs_main); @@ -396,32 +425,76 @@ static CNodeState *State(NodeId pnode) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { return &it->second; } -static void UpdatePreferredDownload(CNode* node, CNodeState* state) EXCLUSIVE_LOCKS_REQUIRED(cs_main) +/** + * Data structure for an individual peer. This struct is not protected by + * cs_main since it does not contain validation-critical data. + * + * Memory is owned by shared pointers and this object is destructed when + * the refcount drops to zero. + * + * TODO: move most members from CNodeState to this structure. + * TODO: move remaining application-layer data members from CNode to this structure. + */ +struct Peer { + /** Same id as the CNode object for this peer */ + const NodeId m_id{0}; + + /** Protects misbehavior data members */ + Mutex m_misbehavior_mutex; + /** Accumulated misbehavior score for this peer */ + int m_misbehavior_score GUARDED_BY(m_misbehavior_mutex){0}; + /** Whether this peer should be disconnected and marked as discouraged (unless it has the noban permission). */ + bool m_should_discourage GUARDED_BY(m_misbehavior_mutex){false}; + + Peer(NodeId id) : m_id(id) {} +}; + +using PeerRef = std::shared_ptr<Peer>; + +/** + * Map of all Peer objects, keyed by peer id. This map is protected + * by the global g_peer_mutex. Once a shared pointer reference is + * taken, the lock may be released. Individual fields are protected by + * their own locks. + */ +Mutex g_peer_mutex; +static std::map<NodeId, PeerRef> g_peer_map GUARDED_BY(g_peer_mutex); + +/** Get a shared pointer to the Peer object. + * May return nullptr if the Peer object can't be found. */ +static PeerRef GetPeerRef(NodeId id) +{ + LOCK(g_peer_mutex); + auto it = g_peer_map.find(id); + return it != g_peer_map.end() ? it->second : nullptr; +} + +static void UpdatePreferredDownload(const CNode& node, CNodeState* state) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { nPreferredDownload -= state->fPreferredDownload; // Whether this node should be marked as a preferred download node. - state->fPreferredDownload = (!node->fInbound || node->HasPermission(PF_NOBAN)) && !node->fOneShot && !node->fClient; + state->fPreferredDownload = (!node.IsInboundConn() || node.HasPermission(PF_NOBAN)) && !node.IsAddrFetchConn() && !node.fClient; nPreferredDownload += state->fPreferredDownload; } -static void PushNodeVersion(CNode *pnode, CConnman* connman, int64_t nTime) +static void PushNodeVersion(CNode& pnode, CConnman& connman, int64_t nTime) { // Note that pnode->GetLocalServices() is a reflection of the local // services we were offering when the CNode object was created for this // peer. - ServiceFlags nLocalNodeServices = pnode->GetLocalServices(); - uint64_t nonce = pnode->GetLocalNonce(); - int nNodeStartingHeight = pnode->GetMyStartingHeight(); - NodeId nodeid = pnode->GetId(); - CAddress addr = pnode->addr; + ServiceFlags nLocalNodeServices = pnode.GetLocalServices(); + uint64_t nonce = pnode.GetLocalNonce(); + int nNodeStartingHeight = pnode.GetMyStartingHeight(); + NodeId nodeid = pnode.GetId(); + CAddress addr = pnode.addr; CAddress addrYou = (addr.IsRoutable() && !IsProxy(addr) ? addr : CAddress(CService(), addr.nServices)); CAddress addrMe = CAddress(CService(), nLocalNodeServices); - connman->PushMessage(pnode, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERSION, PROTOCOL_VERSION, (uint64_t)nLocalNodeServices, nTime, addrYou, addrMe, - nonce, strSubVersion, nNodeStartingHeight, ::g_relay_txes && pnode->m_tx_relay != nullptr)); + connman.PushMessage(&pnode, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERSION, PROTOCOL_VERSION, (uint64_t)nLocalNodeServices, nTime, addrYou, addrMe, + nonce, strSubVersion, nNodeStartingHeight, ::g_relay_txes && pnode.m_tx_relay != nullptr)); if (fLogIPs) { LogPrint(BCLog::NET, "send version message: version %d, blocks=%d, us=%s, them=%s, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, addrMe.ToString(), addrYou.ToString(), nodeid); @@ -444,7 +517,7 @@ static bool MarkBlockAsReceived(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs } if (state->vBlocksInFlight.begin() == itInFlight->second.second) { // First block on the queue was received, update the start download time for the next one - state->nDownloadingSince = std::max(state->nDownloadingSince, GetTimeMicros()); + state->nDownloadingSince = std::max(state->nDownloadingSince, count_microseconds(GetTime<std::chrono::microseconds>())); } state->vBlocksInFlight.erase(itInFlight->second.second); state->nBlocksInFlight--; @@ -457,7 +530,7 @@ static bool MarkBlockAsReceived(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs // returns false, still setting pit, if the block was already in flight from the same peer // pit will only be valid as long as the same cs_main lock is being held -static bool MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, const CBlockIndex* pindex = nullptr, std::list<QueuedBlock>::iterator** pit = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { +static bool MarkBlockAsInFlight(CTxMemPool& mempool, NodeId nodeid, const uint256& hash, const CBlockIndex* pindex = nullptr, std::list<QueuedBlock>::iterator** pit = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { CNodeState *state = State(nodeid); assert(state != nullptr); @@ -479,7 +552,7 @@ static bool MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, const CBlock state->nBlocksInFlightValidHeaders += it->fValidatedHeaders; if (state->nBlocksInFlight == 1) { // We're starting a block download (batch) from this peer. - state->nDownloadingSince = GetTimeMicros(); + state->nDownloadingSince = GetTime<std::chrono::microseconds>().count(); } if (state->nBlocksInFlightValidHeaders == 1 && pindex != nullptr) { nPeersWithValidatedDownloads++; @@ -531,7 +604,7 @@ static void UpdateBlockAvailability(NodeId nodeid, const uint256 &hash) EXCLUSIV * lNodesAnnouncingHeaderAndIDs, and keeping that list under a certain size by * removing the first element if necessary. */ -static void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid, CConnman* connman) EXCLUSIVE_LOCKS_REQUIRED(cs_main) +static void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid, CConnman& connman) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { AssertLockHeld(cs_main); CNodeState* nodestate = State(nodeid); @@ -547,20 +620,19 @@ static void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid, CConnman* connma return; } } - connman->ForNode(nodeid, [connman](CNode* pfrom){ - AssertLockHeld(cs_main); + connman.ForNode(nodeid, [&connman](CNode* pfrom) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) { + AssertLockHeld(::cs_main); uint64_t nCMPCTBLOCKVersion = (pfrom->GetLocalServices() & NODE_WITNESS) ? 2 : 1; if (lNodesAnnouncingHeaderAndIDs.size() >= 3) { // As per BIP152, we only get 3 of our peers to announce // blocks using compact encodings. - connman->ForNode(lNodesAnnouncingHeaderAndIDs.front(), [connman, nCMPCTBLOCKVersion](CNode* pnodeStop){ - AssertLockHeld(cs_main); - connman->PushMessage(pnodeStop, CNetMsgMaker(pnodeStop->GetSendVersion()).Make(NetMsgType::SENDCMPCT, /*fAnnounceUsingCMPCTBLOCK=*/false, nCMPCTBLOCKVersion)); + connman.ForNode(lNodesAnnouncingHeaderAndIDs.front(), [&connman, nCMPCTBLOCKVersion](CNode* pnodeStop){ + connman.PushMessage(pnodeStop, CNetMsgMaker(pnodeStop->GetCommonVersion()).Make(NetMsgType::SENDCMPCT, /*fAnnounceUsingCMPCTBLOCK=*/false, nCMPCTBLOCKVersion)); return true; }); lNodesAnnouncingHeaderAndIDs.pop_front(); } - connman->PushMessage(pfrom, CNetMsgMaker(pfrom->GetSendVersion()).Make(NetMsgType::SENDCMPCT, /*fAnnounceUsingCMPCTBLOCK=*/true, nCMPCTBLOCKVersion)); + connman.PushMessage(pfrom, CNetMsgMaker(pfrom->GetCommonVersion()).Make(NetMsgType::SENDCMPCT, /*fAnnounceUsingCMPCTBLOCK=*/true, nCMPCTBLOCKVersion)); lNodesAnnouncingHeaderAndIDs.push_back(pfrom->GetId()); return true; }); @@ -679,70 +751,35 @@ static void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vec } } -void EraseTxRequest(const uint256& txid) EXCLUSIVE_LOCKS_REQUIRED(cs_main) -{ - g_already_asked_for.erase(txid); -} - -std::chrono::microseconds GetTxRequestTime(const uint256& txid) EXCLUSIVE_LOCKS_REQUIRED(cs_main) -{ - auto it = g_already_asked_for.find(txid); - if (it != g_already_asked_for.end()) { - return it->second; - } - return {}; -} - -void UpdateTxRequestTime(const uint256& txid, std::chrono::microseconds request_time) EXCLUSIVE_LOCKS_REQUIRED(cs_main) -{ - auto it = g_already_asked_for.find(txid); - if (it == g_already_asked_for.end()) { - g_already_asked_for.insert(std::make_pair(txid, request_time)); - } else { - g_already_asked_for.update(it, request_time); - } -} - -std::chrono::microseconds CalculateTxGetDataTime(const uint256& txid, std::chrono::microseconds current_time, bool use_inbound_delay) EXCLUSIVE_LOCKS_REQUIRED(cs_main) -{ - std::chrono::microseconds process_time; - const auto last_request_time = GetTxRequestTime(txid); - // First time requesting this tx - if (last_request_time.count() == 0) { - process_time = current_time; - } else { - // Randomize the delay to avoid biasing some peers over others (such as due to - // fixed ordering of peer processing in ThreadMessageHandler) - process_time = last_request_time + GETDATA_TX_INTERVAL + GetRandMicros(MAX_GETDATA_RANDOM_DELAY); - } - - // We delay processing announcements from inbound peers - if (use_inbound_delay) process_time += INBOUND_PEER_TX_DELAY; - - return process_time; -} +} // namespace -void RequestTx(CNodeState* state, const uint256& txid, std::chrono::microseconds current_time) EXCLUSIVE_LOCKS_REQUIRED(cs_main) +void PeerManager::AddTxAnnouncement(const CNode& node, const GenTxid& gtxid, std::chrono::microseconds current_time) { - CNodeState::TxDownloadState& peer_download_state = state->m_tx_download; - if (peer_download_state.m_tx_announced.size() >= MAX_PEER_TX_ANNOUNCEMENTS || - peer_download_state.m_tx_process_time.size() >= MAX_PEER_TX_ANNOUNCEMENTS || - peer_download_state.m_tx_announced.count(txid)) { - // Too many queued announcements from this peer, or we already have - // this announcement + AssertLockHeld(::cs_main); // For m_txrequest + NodeId nodeid = node.GetId(); + if (!node.HasPermission(PF_RELAY) && m_txrequest.Count(nodeid) >= MAX_PEER_TX_ANNOUNCEMENTS) { + // Too many queued announcements from this peer return; } - peer_download_state.m_tx_announced.insert(txid); - - // Calculate the time to try requesting this transaction. Use - // fPreferredDownload as a proxy for outbound peers. - const auto process_time = CalculateTxGetDataTime(txid, current_time, !state->fPreferredDownload); - - peer_download_state.m_tx_process_time.emplace(process_time, txid); + const CNodeState* state = State(nodeid); + + // Decide the TxRequestTracker parameters for this announcement: + // - "preferred": if fPreferredDownload is set (= outbound, or PF_NOBAN permission) + // - "reqtime": current time plus delays for: + // - NONPREF_PEER_TX_DELAY for announcements from non-preferred connections + // - TXID_RELAY_DELAY for txid announcements while wtxid peers are available + // - OVERLOADED_PEER_TX_DELAY for announcements from peers which have at least + // MAX_PEER_TX_REQUEST_IN_FLIGHT requests in flight (and don't have PF_RELAY). + auto delay = std::chrono::microseconds{0}; + const bool preferred = state->fPreferredDownload; + if (!preferred) delay += NONPREF_PEER_TX_DELAY; + if (!gtxid.IsWtxid() && g_wtxid_relay_peers > 0) delay += TXID_RELAY_DELAY; + const bool overloaded = !node.HasPermission(PF_RELAY) && + m_txrequest.CountInFlight(nodeid) >= MAX_PEER_TX_REQUEST_IN_FLIGHT; + if (overloaded) delay += OVERLOADED_PEER_TX_DELAY; + m_txrequest.ReceivedInv(nodeid, gtxid, preferred, current_time + delay); } -} // namespace - // This function is used for testing the stale tip eviction logic, see // denialofservice_tests.cpp void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds) @@ -752,35 +789,64 @@ void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds) if (state) state->m_last_block_announcement = time_in_seconds; } -// Returns true for outbound peers, excluding manual connections, feelers, and -// one-shots. -static bool IsOutboundDisconnectionCandidate(const CNode *node) -{ - return !(node->fInbound || node->m_manual_connection || node->fFeeler || node->fOneShot); -} - -void PeerLogicValidation::InitializeNode(CNode *pnode) { +void PeerManager::InitializeNode(CNode *pnode) { CAddress addr = pnode->addr; std::string addrName = pnode->GetAddrName(); NodeId nodeid = pnode->GetId(); { LOCK(cs_main); - mapNodeState.emplace_hint(mapNodeState.end(), std::piecewise_construct, std::forward_as_tuple(nodeid), std::forward_as_tuple(addr, std::move(addrName), pnode->fInbound, pnode->m_manual_connection)); + mapNodeState.emplace_hint(mapNodeState.end(), std::piecewise_construct, std::forward_as_tuple(nodeid), std::forward_as_tuple(addr, pnode->IsInboundConn(), pnode->IsManualConn())); + assert(m_txrequest.Count(nodeid) == 0); + } + { + PeerRef peer = std::make_shared<Peer>(nodeid); + LOCK(g_peer_mutex); + g_peer_map.emplace_hint(g_peer_map.end(), nodeid, std::move(peer)); + } + if (!pnode->IsInboundConn()) { + PushNodeVersion(*pnode, m_connman, GetTime()); } - if(!pnode->fInbound) - PushNodeVersion(pnode, connman, GetTime()); } -void PeerLogicValidation::FinalizeNode(NodeId nodeid, bool& fUpdateConnectionTime) { +void PeerManager::ReattemptInitialBroadcast(CScheduler& scheduler) const +{ + std::set<uint256> unbroadcast_txids = m_mempool.GetUnbroadcastTxs(); + + for (const auto& txid : unbroadcast_txids) { + CTransactionRef tx = m_mempool.get(txid); + + if (tx != nullptr) { + LOCK(cs_main); + RelayTransaction(txid, tx->GetWitnessHash(), m_connman); + } else { + m_mempool.RemoveUnbroadcastTx(txid, true); + } + } + + // Schedule next run for 10-15 minutes in the future. + // We add randomness on every cycle to avoid the possibility of P2P fingerprinting. + const std::chrono::milliseconds delta = std::chrono::minutes{10} + GetRandMillis(std::chrono::minutes{5}); + scheduler.scheduleFromNow([&] { ReattemptInitialBroadcast(scheduler); }, delta); +} + +void PeerManager::FinalizeNode(NodeId nodeid, bool& fUpdateConnectionTime) { fUpdateConnectionTime = false; LOCK(cs_main); + int misbehavior{0}; + { + PeerRef peer = GetPeerRef(nodeid); + assert(peer != nullptr); + misbehavior = WITH_LOCK(peer->m_misbehavior_mutex, return peer->m_misbehavior_score); + LOCK(g_peer_mutex); + g_peer_map.erase(nodeid); + } CNodeState *state = State(nodeid); assert(state != nullptr); if (state->fSyncStarted) nSyncStarted--; - if (state->nMisbehavior == 0 && state->fCurrentlyConnected) { + if (misbehavior == 0 && state->fCurrentlyConnected) { fUpdateConnectionTime = true; } @@ -788,11 +854,14 @@ void PeerLogicValidation::FinalizeNode(NodeId nodeid, bool& fUpdateConnectionTim mapBlocksInFlight.erase(entry.hash); } EraseOrphansFor(nodeid); + m_txrequest.DisconnectedPeer(nodeid); nPreferredDownload -= state->fPreferredDownload; nPeersWithValidatedDownloads -= (state->nBlocksInFlightValidHeaders != 0); assert(nPeersWithValidatedDownloads >= 0); g_outbound_peers_with_protect_from_disconnect -= state->m_chain_sync.m_protect; assert(g_outbound_peers_with_protect_from_disconnect >= 0); + g_wtxid_relay_peers -= state->m_wtxid_relay; + assert(g_wtxid_relay_peers >= 0); mapNodeState.erase(nodeid); @@ -802,22 +871,30 @@ void PeerLogicValidation::FinalizeNode(NodeId nodeid, bool& fUpdateConnectionTim assert(nPreferredDownload == 0); assert(nPeersWithValidatedDownloads == 0); assert(g_outbound_peers_with_protect_from_disconnect == 0); + assert(g_wtxid_relay_peers == 0); + assert(m_txrequest.Size() == 0); } LogPrint(BCLog::NET, "Cleared nodestate for peer=%d\n", nodeid); } bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats) { - LOCK(cs_main); - CNodeState *state = State(nodeid); - if (state == nullptr) - return false; - stats.nMisbehavior = state->nMisbehavior; - stats.nSyncHeight = state->pindexBestKnownBlock ? state->pindexBestKnownBlock->nHeight : -1; - stats.nCommonHeight = state->pindexLastCommonBlock ? state->pindexLastCommonBlock->nHeight : -1; - for (const QueuedBlock& queue : state->vBlocksInFlight) { - if (queue.pindex) - stats.vHeightInFlight.push_back(queue.pindex->nHeight); + { + LOCK(cs_main); + CNodeState* state = State(nodeid); + if (state == nullptr) + return false; + stats.nSyncHeight = state->pindexBestKnownBlock ? state->pindexBestKnownBlock->nHeight : -1; + stats.nCommonHeight = state->pindexLastCommonBlock ? state->pindexLastCommonBlock->nHeight : -1; + for (const QueuedBlock& queue : state->vBlocksInFlight) { + if (queue.pindex) + stats.vHeightInFlight.push_back(queue.pindex->nHeight); + } } + + PeerRef peer = GetPeerRef(nodeid); + if (peer == nullptr) return false; + stats.m_misbehavior_score = WITH_LOCK(peer->m_misbehavior_mutex, return peer->m_misbehavior_score); + return true; } @@ -860,6 +937,8 @@ bool AddOrphanTx(const CTransactionRef& tx, NodeId peer) EXCLUSIVE_LOCKS_REQUIRE auto ret = mapOrphanTransactions.emplace(hash, COrphanTx{tx, peer, GetTime() + ORPHAN_TX_EXPIRE_TIME, g_orphan_list.size()}); assert(ret.second); g_orphan_list.push_back(ret.first); + // Allow for lookups in the orphan pool by wtxid, as well as txid + g_orphans_by_wtxid.emplace(tx->GetWitnessHash(), ret.first); for (const CTxIn& txin : tx->vin) { mapOrphanTransactionsByPrev[txin.prevout].insert(ret.first); } @@ -896,6 +975,7 @@ int static EraseOrphanTx(uint256 hash) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans) it_last->second.list_pos = old_pos; } g_orphan_list.pop_back(); + g_orphans_by_wtxid.erase(it->second.tx->GetWitnessHash()); mapOrphanTransactions.erase(it); return 1; @@ -954,49 +1034,27 @@ unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans) return nEvicted; } -/** - * Mark a misbehaving peer to be banned depending upon the value of `-banscore`. - */ -void Misbehaving(NodeId pnode, int howmuch, const std::string& message) EXCLUSIVE_LOCKS_REQUIRED(cs_main) +void PeerManager::Misbehaving(const NodeId pnode, const int howmuch, const std::string& message) { - if (howmuch == 0) - return; + assert(howmuch > 0); - CNodeState *state = State(pnode); - if (state == nullptr) - return; - - state->nMisbehavior += howmuch; - int banscore = gArgs.GetArg("-banscore", DEFAULT_BANSCORE_THRESHOLD); - std::string message_prefixed = message.empty() ? "" : (": " + message); - if (state->nMisbehavior >= banscore && state->nMisbehavior - howmuch < banscore) - { - LogPrint(BCLog::NET, "%s: %s peer=%d (%d -> %d) BAN THRESHOLD EXCEEDED%s\n", __func__, state->name, pnode, state->nMisbehavior-howmuch, state->nMisbehavior, message_prefixed); - state->fShouldBan = true; - } else - LogPrint(BCLog::NET, "%s: %s peer=%d (%d -> %d)%s\n", __func__, state->name, pnode, state->nMisbehavior-howmuch, state->nMisbehavior, message_prefixed); -} + PeerRef peer = GetPeerRef(pnode); + if (peer == nullptr) return; -/** - * Returns true if the given validation state result may result in a peer - * banning/disconnecting us. We use this to determine which unaccepted - * transactions from a whitelisted peer that we can safely relay. - */ -static bool TxRelayMayResultInDisconnect(const TxValidationState& state) { - return state.GetResult() == TxValidationResult::TX_CONSENSUS; + LOCK(peer->m_misbehavior_mutex); + peer->m_misbehavior_score += howmuch; + const std::string message_prefixed = message.empty() ? "" : (": " + message); + if (peer->m_misbehavior_score >= DISCOURAGEMENT_THRESHOLD && peer->m_misbehavior_score - howmuch < DISCOURAGEMENT_THRESHOLD) { + LogPrint(BCLog::NET, "Misbehaving: peer=%d (%d -> %d) DISCOURAGE THRESHOLD EXCEEDED%s\n", pnode, peer->m_misbehavior_score - howmuch, peer->m_misbehavior_score, message_prefixed); + peer->m_should_discourage = true; + } else { + LogPrint(BCLog::NET, "Misbehaving: peer=%d (%d -> %d)%s\n", pnode, peer->m_misbehavior_score - howmuch, peer->m_misbehavior_score, message_prefixed); + } } -/** - * Potentially ban a node based on the contents of a BlockValidationState object - * - * @param[in] via_compact_block: this bool is passed in because net_processing should - * punish peers differently depending on whether the data was provided in a compact - * block message or not. If the compact block had a valid header, but contained invalid - * txs, the peer should not be punished. See BIP 152. - * - * @return Returns true if the peer was punished (probably disconnected) - */ -static bool MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& state, bool via_compact_block, const std::string& message = "") { +bool PeerManager::MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& state, + bool via_compact_block, const std::string& message) +{ switch (state.GetResult()) { case BlockValidationResult::BLOCK_RESULT_UNSET: break; @@ -1004,7 +1062,6 @@ static bool MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& s case BlockValidationResult::BLOCK_CONSENSUS: case BlockValidationResult::BLOCK_MUTATED: if (!via_compact_block) { - LOCK(cs_main); Misbehaving(nodeid, 100, message); return true; } @@ -1017,7 +1074,7 @@ static bool MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& s break; } - // Ban outbound (but not inbound) peers if on an invalid chain. + // Discourage outbound (but not inbound) peers if on an invalid chain. // Exempt HB compact block peers and manual connections. if (!via_compact_block && !node_state->m_is_inbound && !node_state->m_is_manual_connection) { Misbehaving(nodeid, 100, message); @@ -1028,18 +1085,12 @@ static bool MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& s case BlockValidationResult::BLOCK_INVALID_HEADER: case BlockValidationResult::BLOCK_CHECKPOINT: case BlockValidationResult::BLOCK_INVALID_PREV: - { - LOCK(cs_main); - Misbehaving(nodeid, 100, message); - } + Misbehaving(nodeid, 100, message); return true; // Conflicting (but not necessarily invalid) data or different policy: case BlockValidationResult::BLOCK_MISSING_PREV: - { - // TODO: Handle this much more gracefully (10 DoS points is super arbitrary) - LOCK(cs_main); - Misbehaving(nodeid, 10, message); - } + // TODO: Handle this much more gracefully (10 DoS points is super arbitrary) + Misbehaving(nodeid, 10, message); return true; case BlockValidationResult::BLOCK_RECENT_CONSENSUS_CHANGE: case BlockValidationResult::BLOCK_TIME_FUTURE: @@ -1051,30 +1102,23 @@ static bool MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& s return false; } -/** - * Potentially ban a node based on the contents of a TxValidationState object - * - * @return Returns true if the peer was punished (probably disconnected) - * - * Changes here may need to be reflected in TxRelayMayResultInDisconnect(). - */ -static bool MaybePunishNodeForTx(NodeId nodeid, const TxValidationState& state, const std::string& message = "") { +bool PeerManager::MaybePunishNodeForTx(NodeId nodeid, const TxValidationState& state, const std::string& message) +{ switch (state.GetResult()) { case TxValidationResult::TX_RESULT_UNSET: break; // The node is providing invalid data: case TxValidationResult::TX_CONSENSUS: - { - LOCK(cs_main); - Misbehaving(nodeid, 100, message); - return true; - } + Misbehaving(nodeid, 100, message); + return true; // Conflicting (but not necessarily invalid) data or different policy: case TxValidationResult::TX_RECENT_CONSENSUS_CHANGE: + case TxValidationResult::TX_INPUTS_NOT_STANDARD: case TxValidationResult::TX_NOT_STANDARD: case TxValidationResult::TX_MISSING_INPUTS: case TxValidationResult::TX_PREMATURE_SPEND: case TxValidationResult::TX_WITNESS_MUTATED: + case TxValidationResult::TX_WITNESS_STRIPPED: case TxValidationResult::TX_CONFLICT: case TxValidationResult::TX_MEMPOOL_POLICY: break; @@ -1086,11 +1130,6 @@ static bool MaybePunishNodeForTx(NodeId nodeid, const TxValidationState& state, } - - - - - ////////////////////////////////////////////////////////////////////////////// // // blockchain -> download logic notification @@ -1109,59 +1148,113 @@ static bool BlockRequestAllowed(const CBlockIndex* pindex, const Consensus::Para (GetBlockProofEquivalentTime(*pindexBestHeader, *pindex, *pindexBestHeader, consensusParams) < STALE_RELAY_AGE_LIMIT); } -PeerLogicValidation::PeerLogicValidation(CConnman* connmanIn, BanMan* banman, CScheduler& scheduler) - : connman(connmanIn), m_banman(banman), m_stale_tip_check_time(0) +PeerManager::PeerManager(const CChainParams& chainparams, CConnman& connman, BanMan* banman, + CScheduler& scheduler, ChainstateManager& chainman, CTxMemPool& pool) + : m_chainparams(chainparams), + m_connman(connman), + m_banman(banman), + m_chainman(chainman), + m_mempool(pool), + m_stale_tip_check_time(0) { // Initialize global variables that cannot be constructed at startup. recentRejects.reset(new CRollingBloomFilter(120000, 0.000001)); - const Consensus::Params& consensusParams = Params().GetConsensus(); + // Blocks don't typically have more than 4000 transactions, so this should + // be at least six blocks (~1 hr) worth of transactions that we can store, + // inserting both a txid and wtxid for every observed transaction. + // If the number of transactions appearing in a block goes up, or if we are + // seeing getdata requests more than an hour after initial announcement, we + // can increase this number. + // The false positive rate of 1/1M should come out to less than 1 + // transaction per day that would be inadvertently ignored (which is the + // same probability that we have in the reject filter). + g_recent_confirmed_transactions.reset(new CRollingBloomFilter(48000, 0.000001)); + // Stale tip checking and peer eviction are on two different timers, but we // don't want them to get out of sync due to drift in the scheduler, so we // combine them in one function and schedule at the quicker (peer-eviction) // timer. static_assert(EXTRA_PEER_CHECK_INTERVAL < STALE_CHECK_INTERVAL, "peer eviction timer should be less than stale tip check timer"); - scheduler.scheduleEvery(std::bind(&PeerLogicValidation::CheckForStaleTipAndEvictPeers, this, consensusParams), EXTRA_PEER_CHECK_INTERVAL * 1000); + scheduler.scheduleEvery([this] { this->CheckForStaleTipAndEvictPeers(); }, std::chrono::seconds{EXTRA_PEER_CHECK_INTERVAL}); + + // schedule next run for 10-15 minutes in the future + const std::chrono::milliseconds delta = std::chrono::minutes{10} + GetRandMillis(std::chrono::minutes{5}); + scheduler.scheduleFromNow([&] { ReattemptInitialBroadcast(scheduler); }, delta); } /** * Evict orphan txn pool entries (EraseOrphanTx) based on a newly connected - * block. Also save the time of the last tip update. + * block, remember the recently confirmed transactions, and delete tracked + * announcements for them. Also save the time of the last tip update. */ -void PeerLogicValidation::BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindex, const std::vector<CTransactionRef>& vtxConflicted) { - LOCK(g_cs_orphans); +void PeerManager::BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindex) +{ + { + LOCK(g_cs_orphans); - std::vector<uint256> vOrphanErase; + std::vector<uint256> vOrphanErase; - for (const CTransactionRef& ptx : pblock->vtx) { - const CTransaction& tx = *ptx; + for (const CTransactionRef& ptx : pblock->vtx) { + const CTransaction& tx = *ptx; + + // Which orphan pool entries must we evict? + for (const auto& txin : tx.vin) { + auto itByPrev = mapOrphanTransactionsByPrev.find(txin.prevout); + if (itByPrev == mapOrphanTransactionsByPrev.end()) continue; + for (auto mi = itByPrev->second.begin(); mi != itByPrev->second.end(); ++mi) { + const CTransaction& orphanTx = *(*mi)->second.tx; + const uint256& orphanHash = orphanTx.GetHash(); + vOrphanErase.push_back(orphanHash); + } + } + } - // Which orphan pool entries must we evict? - for (const auto& txin : tx.vin) { - auto itByPrev = mapOrphanTransactionsByPrev.find(txin.prevout); - if (itByPrev == mapOrphanTransactionsByPrev.end()) continue; - for (auto mi = itByPrev->second.begin(); mi != itByPrev->second.end(); ++mi) { - const CTransaction& orphanTx = *(*mi)->second.tx; - const uint256& orphanHash = orphanTx.GetHash(); - vOrphanErase.push_back(orphanHash); + // Erase orphan transactions included or precluded by this block + if (vOrphanErase.size()) { + int nErased = 0; + for (const uint256& orphanHash : vOrphanErase) { + nErased += EraseOrphanTx(orphanHash); } + LogPrint(BCLog::MEMPOOL, "Erased %d orphan tx included or conflicted by block\n", nErased); } - } - // Erase orphan transactions included or precluded by this block - if (vOrphanErase.size()) { - int nErased = 0; - for (const uint256& orphanHash : vOrphanErase) { - nErased += EraseOrphanTx(orphanHash); + g_last_tip_update = GetTime(); + } + { + LOCK(g_cs_recent_confirmed_transactions); + for (const auto& ptx : pblock->vtx) { + g_recent_confirmed_transactions->insert(ptx->GetHash()); + if (ptx->GetHash() != ptx->GetWitnessHash()) { + g_recent_confirmed_transactions->insert(ptx->GetWitnessHash()); + } } - LogPrint(BCLog::MEMPOOL, "Erased %d orphan tx included or conflicted by block\n", nErased); } + { + LOCK(cs_main); + for (const auto& ptx : pblock->vtx) { + m_txrequest.ForgetTxHash(ptx->GetHash()); + m_txrequest.ForgetTxHash(ptx->GetWitnessHash()); + } + } +} - g_last_tip_update = GetTime(); +void PeerManager::BlockDisconnected(const std::shared_ptr<const CBlock> &block, const CBlockIndex* pindex) +{ + // To avoid relay problems with transactions that were previously + // confirmed, clear our filter of recently confirmed transactions whenever + // there's a reorg. + // This means that in a 1-block reorg (where 1 block is disconnected and + // then another block reconnected), our filter will drop to having only one + // block's worth of transactions in it, but that should be fine, since + // presumably the most common case of relaying a confirmed transaction + // should be just after a new block containing it is found. + LOCK(g_cs_recent_confirmed_transactions); + g_recent_confirmed_transactions->reset(); } // All of the following cache a recent block, and are protected by cs_most_recent_block -static CCriticalSection cs_most_recent_block; +static RecursiveMutex cs_most_recent_block; static std::shared_ptr<const CBlock> most_recent_block GUARDED_BY(cs_most_recent_block); static std::shared_ptr<const CBlockHeaderAndShortTxIDs> most_recent_compact_block GUARDED_BY(cs_most_recent_block); static uint256 most_recent_block_hash GUARDED_BY(cs_most_recent_block); @@ -1171,7 +1264,7 @@ static bool fWitnessesPresentInMostRecentCompactBlock GUARDED_BY(cs_most_recent_ * Maintain state about the best-seen block and fast-announce a compact block * to compatible peers. */ -void PeerLogicValidation::NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock) { +void PeerManager::NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock) { std::shared_ptr<const CBlockHeaderAndShortTxIDs> pcmpctblock = std::make_shared<const CBlockHeaderAndShortTxIDs> (*pblock, true); const CNetMsgMaker msgMaker(PROTOCOL_VERSION); @@ -1182,7 +1275,7 @@ void PeerLogicValidation::NewPoWValidBlock(const CBlockIndex *pindex, const std: return; nHighestFastAnnounce = pindex->nHeight; - bool fWitnessEnabled = IsWitnessEnabled(pindex->pprev, Params().GetConsensus()); + bool fWitnessEnabled = IsWitnessEnabled(pindex->pprev, m_chainparams.GetConsensus()); uint256 hashBlock(pblock->GetHash()); { @@ -1193,11 +1286,11 @@ void PeerLogicValidation::NewPoWValidBlock(const CBlockIndex *pindex, const std: fWitnessesPresentInMostRecentCompactBlock = fWitnessEnabled; } - connman->ForEachNode([this, &pcmpctblock, pindex, &msgMaker, fWitnessEnabled, &hashBlock](CNode* pnode) { - AssertLockHeld(cs_main); + m_connman.ForEachNode([this, &pcmpctblock, pindex, &msgMaker, fWitnessEnabled, &hashBlock](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) { + AssertLockHeld(::cs_main); // TODO: Avoid the repeated-serialization here - if (pnode->nVersion < INVALID_CB_NO_BAN_VERSION || pnode->fDisconnect) + if (pnode->GetCommonVersion() < INVALID_CB_NO_BAN_VERSION || pnode->fDisconnect) return; ProcessBlockAvailability(pnode->GetId()); CNodeState &state = *State(pnode->GetId()); @@ -1206,9 +1299,9 @@ void PeerLogicValidation::NewPoWValidBlock(const CBlockIndex *pindex, const std: if (state.fPreferHeaderAndIDs && (!fWitnessEnabled || state.fWantsCmpctWitness) && !PeerHasHeader(&state, pindex) && PeerHasHeader(&state, pindex->pprev)) { - LogPrint(BCLog::NET, "%s sending header-and-ids %s to peer=%d\n", "PeerLogicValidation::NewPoWValidBlock", + LogPrint(BCLog::NET, "%s sending header-and-ids %s to peer=%d\n", "PeerManager::NewPoWValidBlock", hashBlock.ToString(), pnode->GetId()); - connman->PushMessage(pnode, msgMaker.Make(NetMsgType::CMPCTBLOCK, *pcmpctblock)); + m_connman.PushMessage(pnode, msgMaker.Make(NetMsgType::CMPCTBLOCK, *pcmpctblock)); state.pindexBestHeaderSent = pindex; } }); @@ -1218,9 +1311,9 @@ void PeerLogicValidation::NewPoWValidBlock(const CBlockIndex *pindex, const std: * Update our best height and announce any block hashes which weren't previously * in ::ChainActive() to our peers. */ -void PeerLogicValidation::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) { +void PeerManager::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) { const int nNewHeight = pindexNew->nHeight; - connman->SetBestHeight(nNewHeight); + m_connman.SetBestHeight(nNewHeight); SetServiceFlagsIBDCache(!fInitialDownload); if (!fInitialDownload) { @@ -1237,22 +1330,23 @@ void PeerLogicValidation::UpdatedBlockTip(const CBlockIndex *pindexNew, const CB } } // Relay inventory, but don't relay old inventory during initial block download. - connman->ForEachNode([nNewHeight, &vHashes](CNode* pnode) { + m_connman.ForEachNode([nNewHeight, &vHashes](CNode* pnode) { + LOCK(pnode->cs_inventory); if (nNewHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : 0)) { for (const uint256& hash : reverse_iterate(vHashes)) { - pnode->PushBlockHash(hash); + pnode->vBlockHashesToAnnounce.push_back(hash); } } }); - connman->WakeMessageHandler(); + m_connman.WakeMessageHandler(); } } /** - * Handle invalid block rejection and consequent peer banning, maintain which + * Handle invalid block rejection and consequent peer discouragement, maintain which * peers announce compact blocks. */ -void PeerLogicValidation::BlockChecked(const CBlock& block, const BlockValidationState& state) { +void PeerManager::BlockChecked(const CBlock& block, const BlockValidationState& state) { LOCK(cs_main); const uint256 hash(block.GetHash()); @@ -1275,7 +1369,7 @@ void PeerLogicValidation::BlockChecked(const CBlock& block, const BlockValidatio !::ChainstateActive().IsInitialBlockDownload() && mapBlocksInFlight.count(hash) == mapBlocksInFlight.size()) { if (it != mapBlockSource.end()) { - MaybeSetPeerAsAnnouncingHeaderAndIDs(it->second.first, connman); + MaybeSetPeerAsAnnouncingHeaderAndIDs(it->second.first, m_connman); } } if (it != mapBlockSource.end()) @@ -1288,68 +1382,76 @@ void PeerLogicValidation::BlockChecked(const CBlock& block, const BlockValidatio // -bool static AlreadyHave(const CInv& inv) EXCLUSIVE_LOCKS_REQUIRED(cs_main) +bool static AlreadyHaveTx(const GenTxid& gtxid, const CTxMemPool& mempool) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { - switch (inv.type) - { - case MSG_TX: - case MSG_WITNESS_TX: - { - assert(recentRejects); - if (::ChainActive().Tip()->GetBlockHash() != hashRecentRejectsChainTip) - { - // If the chain tip has changed previously rejected transactions - // might be now valid, e.g. due to a nLockTime'd tx becoming valid, - // or a double-spend. Reset the rejects filter and give those - // txs a second chance. - hashRecentRejectsChainTip = ::ChainActive().Tip()->GetBlockHash(); - recentRejects->reset(); - } + assert(recentRejects); + if (::ChainActive().Tip()->GetBlockHash() != hashRecentRejectsChainTip) { + // If the chain tip has changed previously rejected transactions + // might be now valid, e.g. due to a nLockTime'd tx becoming valid, + // or a double-spend. Reset the rejects filter and give those + // txs a second chance. + hashRecentRejectsChainTip = ::ChainActive().Tip()->GetBlockHash(); + recentRejects->reset(); + } - { - LOCK(g_cs_orphans); - if (mapOrphanTransactions.count(inv.hash)) return true; - } - const CCoinsViewCache& coins_cache = ::ChainstateActive().CoinsTip(); + const uint256& hash = gtxid.GetHash(); - return recentRejects->contains(inv.hash) || - mempool.exists(inv.hash) || - coins_cache.HaveCoinInCache(COutPoint(inv.hash, 0)) || // Best effort: only try output 0 and 1 - coins_cache.HaveCoinInCache(COutPoint(inv.hash, 1)); + { + LOCK(g_cs_orphans); + if (!gtxid.IsWtxid() && mapOrphanTransactions.count(hash)) { + return true; + } else if (gtxid.IsWtxid() && g_orphans_by_wtxid.count(hash)) { + return true; } - case MSG_BLOCK: - case MSG_WITNESS_BLOCK: - return LookupBlockIndex(inv.hash) != nullptr; } - // Don't know what it is, just say we already got one - return true; + + { + LOCK(g_cs_recent_confirmed_transactions); + if (g_recent_confirmed_transactions->contains(hash)) return true; + } + + return recentRejects->contains(hash) || mempool.exists(gtxid); } -void RelayTransaction(const uint256& txid, const CConnman& connman) +bool static AlreadyHaveBlock(const uint256& block_hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { - CInv inv(MSG_TX, txid); - connman.ForEachNode([&inv](CNode* pnode) - { - pnode->PushInventory(inv); + return LookupBlockIndex(block_hash) != nullptr; +} + +void RelayTransaction(const uint256& txid, const uint256& wtxid, const CConnman& connman) +{ + connman.ForEachNode([&txid, &wtxid](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) { + AssertLockHeld(::cs_main); + + CNodeState* state = State(pnode->GetId()); + if (state == nullptr) return; + if (state->m_wtxid_relay) { + pnode->PushTxInventory(wtxid); + } else { + pnode->PushTxInventory(txid); + } }); } -static void RelayAddress(const CAddress& addr, bool fReachable, CConnman* connman) +static void RelayAddress(const CAddress& addr, bool fReachable, const CConnman& connman) { - unsigned int nRelayNodes = fReachable ? 2 : 1; // limited relaying of addresses outside our network(s) + if (!fReachable && !addr.IsRelayable()) return; // Relay to a limited number of other nodes // Use deterministic randomness to send to the same nodes for 24 hours // at a time so the m_addr_knowns of the chosen nodes prevent repeats uint64_t hashAddr = addr.GetHash(); - const CSipHasher hasher = connman->GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24*60*60)); + const CSipHasher hasher = connman.GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24 * 60 * 60)); FastRandomContext insecure_rand; + // Relay reachable addresses to 2 peers. Unreachable addresses are relayed randomly to 1 or 2 peers. + unsigned int nRelayNodes = (fReachable || (hasher.Finalize() & 1)) ? 2 : 1; + std::array<std::pair<uint64_t, CNode*>,2> best{{{0, nullptr}, {0, nullptr}}}; assert(nRelayNodes <= best.size()); auto sortfunc = [&best, &hasher, nRelayNodes](CNode* pnode) { - if (pnode->nVersion >= CADDR_TIME_VERSION && pnode->IsAddrRelayPeer()) { + if (pnode->RelayAddrsWithConn()) { uint64_t hashKey = CSipHasher(hasher).Write(pnode->GetId()).Finalize(); for (unsigned int i = 0; i < nRelayNodes; i++) { if (hashKey > best[i].first) { @@ -1367,10 +1469,10 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman* connma } }; - connman->ForEachNodeThen(std::move(sortfunc), std::move(pushfunc)); + connman.ForEachNodeThen(std::move(sortfunc), std::move(pushfunc)); } -void static ProcessGetBlockData(CNode* pfrom, const CChainParams& chainparams, const CInv& inv, CConnman* connman) +void static ProcessGetBlockData(CNode& pfrom, const CChainParams& chainparams, const CInv& inv, CConnman& connman) { bool send = false; std::shared_ptr<const CBlock> a_recent_block; @@ -1402,8 +1504,8 @@ void static ProcessGetBlockData(CNode* pfrom, const CChainParams& chainparams, c } // release cs_main before calling ActivateBestChain if (need_activate_chain) { BlockValidationState state; - if (!ActivateBestChain(state, Params(), a_recent_block)) { - LogPrint(BCLog::NET, "failed to activate chain (%s)\n", FormatStateMessage(state)); + if (!ActivateBestChain(state, chainparams, a_recent_block)) { + LogPrint(BCLog::NET, "failed to activate chain (%s)\n", state.ToString()); } } @@ -1412,28 +1514,30 @@ void static ProcessGetBlockData(CNode* pfrom, const CChainParams& chainparams, c if (pindex) { send = BlockRequestAllowed(pindex, consensusParams); if (!send) { - LogPrint(BCLog::NET, "%s: ignoring request from peer=%i for old block that isn't in the main chain\n", __func__, pfrom->GetId()); + LogPrint(BCLog::NET, "%s: ignoring request from peer=%i for old block that isn't in the main chain\n", __func__, pfrom.GetId()); } } - const CNetMsgMaker msgMaker(pfrom->GetSendVersion()); + const CNetMsgMaker msgMaker(pfrom.GetCommonVersion()); // disconnect node in case we have reached the outbound limit for serving historical blocks - // never disconnect whitelisted nodes - if (send && connman->OutboundTargetReached(true) && ( ((pindexBestHeader != nullptr) && (pindexBestHeader->GetBlockTime() - pindex->GetBlockTime() > HISTORICAL_BLOCK_AGE)) || inv.type == MSG_FILTERED_BLOCK) && !pfrom->HasPermission(PF_NOBAN)) - { - LogPrint(BCLog::NET, "historical block serving limit reached, disconnect peer=%d\n", pfrom->GetId()); + if (send && + connman.OutboundTargetReached(true) && + (((pindexBestHeader != nullptr) && (pindexBestHeader->GetBlockTime() - pindex->GetBlockTime() > HISTORICAL_BLOCK_AGE)) || inv.IsMsgFilteredBlk()) && + !pfrom.HasPermission(PF_DOWNLOAD) // nodes with the download permission may exceed target + ) { + LogPrint(BCLog::NET, "historical block serving limit reached, disconnect peer=%d\n", pfrom.GetId()); //disconnect node - pfrom->fDisconnect = true; + pfrom.fDisconnect = true; send = false; } // Avoid leaking prune-height by never sending blocks below the NODE_NETWORK_LIMITED threshold - if (send && !pfrom->HasPermission(PF_NOBAN) && ( - (((pfrom->GetLocalServices() & NODE_NETWORK_LIMITED) == NODE_NETWORK_LIMITED) && ((pfrom->GetLocalServices() & NODE_NETWORK) != NODE_NETWORK) && (::ChainActive().Tip()->nHeight - pindex->nHeight > (int)NODE_NETWORK_LIMITED_MIN_BLOCKS + 2 /* add two blocks buffer extension for possible races */) ) + if (send && !pfrom.HasPermission(PF_NOBAN) && ( + (((pfrom.GetLocalServices() & NODE_NETWORK_LIMITED) == NODE_NETWORK_LIMITED) && ((pfrom.GetLocalServices() & NODE_NETWORK) != NODE_NETWORK) && (::ChainActive().Tip()->nHeight - pindex->nHeight > (int)NODE_NETWORK_LIMITED_MIN_BLOCKS + 2 /* add two blocks buffer extension for possible races */) ) )) { - LogPrint(BCLog::NET, "Ignore block request below NODE_NETWORK_LIMITED threshold from peer=%d\n", pfrom->GetId()); + LogPrint(BCLog::NET, "Ignore block request below NODE_NETWORK_LIMITED threshold from peer=%d\n", pfrom.GetId()); //disconnect node and prevent it from stalling (would otherwise wait for the missing block) - pfrom->fDisconnect = true; + pfrom.fDisconnect = true; send = false; } // Pruned nodes may have deleted the block, so check whether @@ -1443,14 +1547,14 @@ void static ProcessGetBlockData(CNode* pfrom, const CChainParams& chainparams, c std::shared_ptr<const CBlock> pblock; if (a_recent_block && a_recent_block->GetHash() == pindex->GetBlockHash()) { pblock = a_recent_block; - } else if (inv.type == MSG_WITNESS_BLOCK) { + } else if (inv.IsMsgWitnessBlk()) { // Fast-path: in this case it is possible to serve the block directly from disk, // as the network format matches the format on disk std::vector<uint8_t> block_data; if (!ReadRawBlockFromDisk(block_data, pindex, chainparams.MessageStart())) { assert(!"cannot load block from disk"); } - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::BLOCK, MakeSpan(block_data))); + connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::BLOCK, MakeSpan(block_data))); // Don't set pblock as we've sent the block } else { // Send block from disk @@ -1460,23 +1564,22 @@ void static ProcessGetBlockData(CNode* pfrom, const CChainParams& chainparams, c pblock = pblockRead; } if (pblock) { - if (inv.type == MSG_BLOCK) - connman->PushMessage(pfrom, msgMaker.Make(SERIALIZE_TRANSACTION_NO_WITNESS, NetMsgType::BLOCK, *pblock)); - else if (inv.type == MSG_WITNESS_BLOCK) - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::BLOCK, *pblock)); - else if (inv.type == MSG_FILTERED_BLOCK) - { + if (inv.IsMsgBlk()) { + connman.PushMessage(&pfrom, msgMaker.Make(SERIALIZE_TRANSACTION_NO_WITNESS, NetMsgType::BLOCK, *pblock)); + } else if (inv.IsMsgWitnessBlk()) { + connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::BLOCK, *pblock)); + } else if (inv.IsMsgFilteredBlk()) { bool sendMerkleBlock = false; CMerkleBlock merkleBlock; - if (pfrom->m_tx_relay != nullptr) { - LOCK(pfrom->m_tx_relay->cs_filter); - if (pfrom->m_tx_relay->pfilter) { + if (pfrom.m_tx_relay != nullptr) { + LOCK(pfrom.m_tx_relay->cs_filter); + if (pfrom.m_tx_relay->pfilter) { sendMerkleBlock = true; - merkleBlock = CMerkleBlock(*pblock, *pfrom->m_tx_relay->pfilter); + merkleBlock = CMerkleBlock(*pblock, *pfrom.m_tx_relay->pfilter); } } if (sendMerkleBlock) { - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::MERKLEBLOCK, merkleBlock)); + connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::MERKLEBLOCK, merkleBlock)); // CMerkleBlock just contains hashes, so also push any transactions in the block the client did not see // This avoids hurting performance by pointlessly requiring a round-trip // Note that there is currently no way for a node to request any single transactions we didn't send here - @@ -1485,115 +1588,146 @@ void static ProcessGetBlockData(CNode* pfrom, const CChainParams& chainparams, c // however we MUST always provide at least what the remote peer needs typedef std::pair<unsigned int, uint256> PairType; for (PairType& pair : merkleBlock.vMatchedTxn) - connman->PushMessage(pfrom, msgMaker.Make(SERIALIZE_TRANSACTION_NO_WITNESS, NetMsgType::TX, *pblock->vtx[pair.first])); + connman.PushMessage(&pfrom, msgMaker.Make(SERIALIZE_TRANSACTION_NO_WITNESS, NetMsgType::TX, *pblock->vtx[pair.first])); } // else // no response - } - else if (inv.type == MSG_CMPCT_BLOCK) - { + } else if (inv.IsMsgCmpctBlk()) { // If a peer is asking for old blocks, we're almost guaranteed // they won't have a useful mempool to match against a compact block, // and we don't feel like constructing the object for them, so // instead we respond with the full, non-compact block. - bool fPeerWantsWitness = State(pfrom->GetId())->fWantsCmpctWitness; + bool fPeerWantsWitness = State(pfrom.GetId())->fWantsCmpctWitness; int nSendFlags = fPeerWantsWitness ? 0 : SERIALIZE_TRANSACTION_NO_WITNESS; if (CanDirectFetch(consensusParams) && pindex->nHeight >= ::ChainActive().Height() - MAX_CMPCTBLOCK_DEPTH) { if ((fPeerWantsWitness || !fWitnessesPresentInARecentCompactBlock) && a_recent_compact_block && a_recent_compact_block->header.GetHash() == pindex->GetBlockHash()) { - connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, *a_recent_compact_block)); + connman.PushMessage(&pfrom, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, *a_recent_compact_block)); } else { CBlockHeaderAndShortTxIDs cmpctblock(*pblock, fPeerWantsWitness); - connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock)); + connman.PushMessage(&pfrom, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock)); } } else { - connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCK, *pblock)); + connman.PushMessage(&pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCK, *pblock)); } } } // Trigger the peer node to send a getblocks request for the next batch of inventory - if (inv.hash == pfrom->hashContinue) + if (inv.hash == pfrom.hashContinue) { - // Bypass PushInventory, this must send even if redundant, + // Send immediately. This must send even if redundant, // and we want it right after the last block so they don't // wait for other stuff first. std::vector<CInv> vInv; vInv.push_back(CInv(MSG_BLOCK, ::ChainActive().Tip()->GetBlockHash())); - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::INV, vInv)); - pfrom->hashContinue.SetNull(); + connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::INV, vInv)); + pfrom.hashContinue.SetNull(); } } } -void static ProcessGetData(CNode* pfrom, const CChainParams& chainparams, CConnman* connman, const std::atomic<bool>& interruptMsgProc) LOCKS_EXCLUDED(cs_main) +//! Determine whether or not a peer can request a transaction, and return it (or nullptr if not found or not allowed). +static CTransactionRef FindTxForGetData(const CTxMemPool& mempool, const CNode& peer, const GenTxid& gtxid, const std::chrono::seconds mempool_req, const std::chrono::seconds now) LOCKS_EXCLUDED(cs_main) { - AssertLockNotHeld(cs_main); - - std::deque<CInv>::iterator it = pfrom->vRecvGetData.begin(); - std::vector<CInv> vNotFound; - const CNetMsgMaker msgMaker(pfrom->GetSendVersion()); - - // Note that if we receive a getdata for a MSG_TX or MSG_WITNESS_TX from a - // block-relay-only outbound peer, we will stop processing further getdata - // messages from this peer (likely resulting in our peer eventually - // disconnecting us). - if (pfrom->m_tx_relay != nullptr) { - // mempool entries added before this time have likely expired from mapRelay - const std::chrono::seconds longlived_mempool_time = GetTime<std::chrono::seconds>() - RELAY_TX_CACHE_TIME; - const std::chrono::seconds mempool_req = pfrom->m_tx_relay->m_last_mempool_req.load(); + auto txinfo = mempool.info(gtxid); + if (txinfo.tx) { + // If a TX could have been INVed in reply to a MEMPOOL request, + // or is older than UNCONDITIONAL_RELAY_DELAY, permit the request + // unconditionally. + if ((mempool_req.count() && txinfo.m_time <= mempool_req) || txinfo.m_time <= now - UNCONDITIONAL_RELAY_DELAY) { + return std::move(txinfo.tx); + } + } + { LOCK(cs_main); + // Otherwise, the transaction must have been announced recently. + if (State(peer.GetId())->m_recently_announced_invs.contains(gtxid.GetHash())) { + // If it was, it can be relayed from either the mempool... + if (txinfo.tx) return std::move(txinfo.tx); + // ... or the relay pool. + auto mi = mapRelay.find(gtxid.GetHash()); + if (mi != mapRelay.end()) return mi->second; + } + } - while (it != pfrom->vRecvGetData.end() && (it->type == MSG_TX || it->type == MSG_WITNESS_TX)) { - if (interruptMsgProc) - return; - // Don't bother if send buffer is too full to respond anyway - if (pfrom->fPauseSend) - break; + return {}; +} - const CInv &inv = *it; - it++; +void static ProcessGetData(CNode& pfrom, const CChainParams& chainparams, CConnman& connman, CTxMemPool& mempool, const std::atomic<bool>& interruptMsgProc) LOCKS_EXCLUDED(cs_main) +{ + AssertLockNotHeld(cs_main); - // Send stream from relay memory - bool push = false; - auto mi = mapRelay.find(inv.hash); - int nSendFlags = (inv.type == MSG_TX ? SERIALIZE_TRANSACTION_NO_WITNESS : 0); - if (mi != mapRelay.end()) { - connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::TX, *mi->second)); - push = true; - } else { - auto txinfo = mempool.info(inv.hash); - // To protect privacy, do not answer getdata using the mempool when - // that TX couldn't have been INVed in reply to a MEMPOOL request, - // or when it's too recent to have expired from mapRelay. - if (txinfo.tx && ( - (mempool_req.count() && txinfo.m_time <= mempool_req) - || (txinfo.m_time <= longlived_mempool_time))) - { - connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::TX, *txinfo.tx)); - push = true; + std::deque<CInv>::iterator it = pfrom.vRecvGetData.begin(); + std::vector<CInv> vNotFound; + const CNetMsgMaker msgMaker(pfrom.GetCommonVersion()); + + const std::chrono::seconds now = GetTime<std::chrono::seconds>(); + // Get last mempool request time + const std::chrono::seconds mempool_req = pfrom.m_tx_relay != nullptr ? pfrom.m_tx_relay->m_last_mempool_req.load() + : std::chrono::seconds::min(); + + // Process as many TX items from the front of the getdata queue as + // possible, since they're common and it's efficient to batch process + // them. + while (it != pfrom.vRecvGetData.end() && it->IsGenTxMsg()) { + if (interruptMsgProc) return; + // The send buffer provides backpressure. If there's no space in + // the buffer, pause processing until the next call. + if (pfrom.fPauseSend) break; + + const CInv &inv = *it++; + + if (pfrom.m_tx_relay == nullptr) { + // Ignore GETDATA requests for transactions from blocks-only peers. + continue; + } + + CTransactionRef tx = FindTxForGetData(mempool, pfrom, ToGenTxid(inv), mempool_req, now); + if (tx) { + // WTX and WITNESS_TX imply we serialize with witness + int nSendFlags = (inv.IsMsgTx() ? SERIALIZE_TRANSACTION_NO_WITNESS : 0); + connman.PushMessage(&pfrom, msgMaker.Make(nSendFlags, NetMsgType::TX, *tx)); + mempool.RemoveUnbroadcastTx(tx->GetHash()); + // As we're going to send tx, make sure its unconfirmed parents are made requestable. + std::vector<uint256> parent_ids_to_add; + { + LOCK(mempool.cs); + auto txiter = mempool.GetIter(tx->GetHash()); + if (txiter) { + const CTxMemPoolEntry::Parents& parents = (*txiter)->GetMemPoolParentsConst(); + parent_ids_to_add.reserve(parents.size()); + for (const CTxMemPoolEntry& parent : parents) { + if (parent.GetTime() > now - UNCONDITIONAL_RELAY_DELAY) { + parent_ids_to_add.push_back(parent.GetTx().GetHash()); + } + } } } - if (!push) { - vNotFound.push_back(inv); + for (const uint256& parent_txid : parent_ids_to_add) { + // Relaying a transaction with a recent but unconfirmed parent. + if (WITH_LOCK(pfrom.m_tx_relay->cs_tx_inventory, return !pfrom.m_tx_relay->filterInventoryKnown.contains(parent_txid))) { + LOCK(cs_main); + State(pfrom.GetId())->m_recently_announced_invs.insert(parent_txid); + } } + } else { + vNotFound.push_back(inv); } - } // release cs_main + } - if (it != pfrom->vRecvGetData.end() && !pfrom->fPauseSend) { - const CInv &inv = *it; - if (inv.type == MSG_BLOCK || inv.type == MSG_FILTERED_BLOCK || inv.type == MSG_CMPCT_BLOCK || inv.type == MSG_WITNESS_BLOCK) { - it++; + // Only process one BLOCK item per call, since they're uncommon and can be + // expensive to process. + if (it != pfrom.vRecvGetData.end() && !pfrom.fPauseSend) { + const CInv &inv = *it++; + if (inv.IsGenBlkMsg()) { ProcessGetBlockData(pfrom, chainparams, inv, connman); } + // else: If the first item on the queue is an unknown type, we erase it + // and continue processing the queue on the next call. } - // Unknown types in the GetData stay in vRecvGetData and block any future - // message from this peer, see vRecvGetData check in ProcessMessages(). - // Depending on future p2p changes, we might either drop unknown getdata on - // the floor or disconnect the peer. - - pfrom->vRecvGetData.erase(pfrom->vRecvGetData.begin(), it); + pfrom.vRecvGetData.erase(pfrom.vRecvGetData.begin(), it); if (!vNotFound.empty()) { // Let the peer know that we didn't find what it asked for, so it doesn't @@ -1610,49 +1744,48 @@ void static ProcessGetData(CNode* pfrom, const CChainParams& chainparams, CConnm // In normal operation, we often send NOTFOUND messages for parents of // transactions that we relay; if a peer is missing a parent, they may // assume we have them and request the parents from us. - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::NOTFOUND, vNotFound)); + connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::NOTFOUND, vNotFound)); } } -static uint32_t GetFetchFlags(CNode* pfrom) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { +static uint32_t GetFetchFlags(const CNode& pfrom) EXCLUSIVE_LOCKS_REQUIRED(cs_main) { uint32_t nFetchFlags = 0; - if ((pfrom->GetLocalServices() & NODE_WITNESS) && State(pfrom->GetId())->fHaveWitness) { + if ((pfrom.GetLocalServices() & NODE_WITNESS) && State(pfrom.GetId())->fHaveWitness) { nFetchFlags |= MSG_WITNESS_FLAG; } return nFetchFlags; } -inline void static SendBlockTransactions(const CBlock& block, const BlockTransactionsRequest& req, CNode* pfrom, CConnman* connman) { +void PeerManager::SendBlockTransactions(CNode& pfrom, const CBlock& block, const BlockTransactionsRequest& req) { BlockTransactions resp(req); for (size_t i = 0; i < req.indexes.size(); i++) { if (req.indexes[i] >= block.vtx.size()) { - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 100, strprintf("Peer %d sent us a getblocktxn with out-of-bounds tx indices", pfrom->GetId())); + Misbehaving(pfrom.GetId(), 100, "getblocktxn with out-of-bounds tx indices"); return; } resp.txn[i] = block.vtx[req.indexes[i]]; } LOCK(cs_main); - const CNetMsgMaker msgMaker(pfrom->GetSendVersion()); - int nSendFlags = State(pfrom->GetId())->fWantsCmpctWitness ? 0 : SERIALIZE_TRANSACTION_NO_WITNESS; - connman->PushMessage(pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCKTXN, resp)); + const CNetMsgMaker msgMaker(pfrom.GetCommonVersion()); + int nSendFlags = State(pfrom.GetId())->fWantsCmpctWitness ? 0 : SERIALIZE_TRANSACTION_NO_WITNESS; + m_connman.PushMessage(&pfrom, msgMaker.Make(nSendFlags, NetMsgType::BLOCKTXN, resp)); } -bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::vector<CBlockHeader>& headers, const CChainParams& chainparams, bool via_compact_block) +void PeerManager::ProcessHeadersMessage(CNode& pfrom, const std::vector<CBlockHeader>& headers, bool via_compact_block) { - const CNetMsgMaker msgMaker(pfrom->GetSendVersion()); + const CNetMsgMaker msgMaker(pfrom.GetCommonVersion()); size_t nCount = headers.size(); if (nCount == 0) { // Nothing interesting. Stop asking this peers for more headers. - return true; + return; } bool received_new_header = false; const CBlockIndex *pindexLast = nullptr; { LOCK(cs_main); - CNodeState *nodestate = State(pfrom->GetId()); + CNodeState *nodestate = State(pfrom.GetId()); // If this looks like it could be a block announcement (nCount < // MAX_BLOCKS_TO_ANNOUNCE), use special logic for handling headers that @@ -1664,28 +1797,28 @@ bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::ve // nUnconnectingHeaders gets reset back to 0. if (!LookupBlockIndex(headers[0].hashPrevBlock) && nCount < MAX_BLOCKS_TO_ANNOUNCE) { nodestate->nUnconnectingHeaders++; - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexBestHeader), uint256())); + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexBestHeader), uint256())); LogPrint(BCLog::NET, "received header %s: missing prev block %s, sending getheaders (%d) to end (peer=%d, nUnconnectingHeaders=%d)\n", headers[0].GetHash().ToString(), headers[0].hashPrevBlock.ToString(), pindexBestHeader->nHeight, - pfrom->GetId(), nodestate->nUnconnectingHeaders); + pfrom.GetId(), nodestate->nUnconnectingHeaders); // Set hashLastUnknownBlock for this peer, so that if we // eventually get the headers - even from a different peer - // we can use this peer to download. - UpdateBlockAvailability(pfrom->GetId(), headers.back().GetHash()); + UpdateBlockAvailability(pfrom.GetId(), headers.back().GetHash()); if (nodestate->nUnconnectingHeaders % MAX_UNCONNECTING_HEADERS == 0) { - Misbehaving(pfrom->GetId(), 20); + Misbehaving(pfrom.GetId(), 20, strprintf("%d non-connecting headers", nodestate->nUnconnectingHeaders)); } - return true; + return; } uint256 hashLastBlock; for (const CBlockHeader& header : headers) { if (!hashLastBlock.IsNull() && header.hashPrevBlock != hashLastBlock) { - Misbehaving(pfrom->GetId(), 20, "non-continuous headers sequence"); - return false; + Misbehaving(pfrom.GetId(), 20, "non-continuous headers sequence"); + return; } hashLastBlock = header.GetHash(); } @@ -1698,23 +1831,23 @@ bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::ve } BlockValidationState state; - if (!ProcessNewBlockHeaders(headers, state, chainparams, &pindexLast)) { + if (!m_chainman.ProcessNewBlockHeaders(headers, state, m_chainparams, &pindexLast)) { if (state.IsInvalid()) { - MaybePunishNodeForBlock(pfrom->GetId(), state, via_compact_block, "invalid header received"); - return false; + MaybePunishNodeForBlock(pfrom.GetId(), state, via_compact_block, "invalid header received"); + return; } } { LOCK(cs_main); - CNodeState *nodestate = State(pfrom->GetId()); + CNodeState *nodestate = State(pfrom.GetId()); if (nodestate->nUnconnectingHeaders > 0) { - LogPrint(BCLog::NET, "peer=%d: resetting nUnconnectingHeaders (%d -> 0)\n", pfrom->GetId(), nodestate->nUnconnectingHeaders); + LogPrint(BCLog::NET, "peer=%d: resetting nUnconnectingHeaders (%d -> 0)\n", pfrom.GetId(), nodestate->nUnconnectingHeaders); } nodestate->nUnconnectingHeaders = 0; assert(pindexLast); - UpdateBlockAvailability(pfrom->GetId(), pindexLast->GetBlockHash()); + UpdateBlockAvailability(pfrom.GetId(), pindexLast->GetBlockHash()); // From here, pindexBestKnownBlock should be guaranteed to be non-null, // because it is set in UpdateBlockAvailability. Some nullptr checks @@ -1728,11 +1861,11 @@ bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::ve // Headers message had its maximum size; the peer may have more headers. // TODO: optimize: if pindexLast is an ancestor of ::ChainActive().Tip or pindexBestHeader, continue // from there instead. - LogPrint(BCLog::NET, "more getheaders (%d) to end to peer=%d (startheight:%d)\n", pindexLast->nHeight, pfrom->GetId(), pfrom->nStartingHeight); - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexLast), uint256())); + LogPrint(BCLog::NET, "more getheaders (%d) to end to peer=%d (startheight:%d)\n", pindexLast->nHeight, pfrom.GetId(), pfrom.nStartingHeight); + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexLast), uint256())); } - bool fCanDirectFetch = CanDirectFetch(chainparams.GetConsensus()); + bool fCanDirectFetch = CanDirectFetch(m_chainparams.GetConsensus()); // If this set of headers is valid and ends in a block with at least as // much work as our tip, download as much as possible. if (fCanDirectFetch && pindexLast->IsValid(BLOCK_VALID_TREE) && ::ChainActive().Tip()->nChainWork <= pindexLast->nChainWork) { @@ -1742,7 +1875,7 @@ bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::ve while (pindexWalk && !::ChainActive().Contains(pindexWalk) && vToFetch.size() <= MAX_BLOCKS_IN_TRANSIT_PER_PEER) { if (!(pindexWalk->nStatus & BLOCK_HAVE_DATA) && !mapBlocksInFlight.count(pindexWalk->GetBlockHash()) && - (!IsWitnessEnabled(pindexWalk->pprev, chainparams.GetConsensus()) || State(pfrom->GetId())->fHaveWitness)) { + (!IsWitnessEnabled(pindexWalk->pprev, m_chainparams.GetConsensus()) || State(pfrom.GetId())->fHaveWitness)) { // We don't have this block, and it's not yet in flight. vToFetch.push_back(pindexWalk); } @@ -1766,9 +1899,9 @@ bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::ve } uint32_t nFetchFlags = GetFetchFlags(pfrom); vGetData.push_back(CInv(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash())); - MarkBlockAsInFlight(pfrom->GetId(), pindex->GetBlockHash(), pindex); + MarkBlockAsInFlight(m_mempool, pfrom.GetId(), pindex->GetBlockHash(), pindex); LogPrint(BCLog::NET, "Requesting block %s from peer=%d\n", - pindex->GetBlockHash().ToString(), pfrom->GetId()); + pindex->GetBlockHash().ToString(), pfrom.GetId()); } if (vGetData.size() > 1) { LogPrint(BCLog::NET, "Downloading blocks toward %s (%d) via headers direct fetch\n", @@ -1779,7 +1912,7 @@ bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::ve // In any case, we want to download using a compact block, not a regular one vGetData[0] = CInv(MSG_CMPCT_BLOCK, vGetData[0].hash); } - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vGetData)); + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETDATA, vGetData)); } } } @@ -1790,43 +1923,51 @@ bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::ve // headers to fetch from this peer. if (nodestate->pindexBestKnownBlock && nodestate->pindexBestKnownBlock->nChainWork < nMinimumChainWork) { // This peer has too little work on their headers chain to help - // us sync -- disconnect if using an outbound slot (unless - // whitelisted or addnode). + // us sync -- disconnect if it is an outbound disconnection + // candidate. // Note: We compare their tip to nMinimumChainWork (rather than // ::ChainActive().Tip()) because we won't start block download // until we have a headers chain that has at least // nMinimumChainWork, even if a peer has a chain past our tip, // as an anti-DoS measure. - if (IsOutboundDisconnectionCandidate(pfrom)) { - LogPrintf("Disconnecting outbound peer %d -- headers chain has insufficient work\n", pfrom->GetId()); - pfrom->fDisconnect = true; + if (pfrom.IsOutboundOrBlockRelayConn()) { + LogPrintf("Disconnecting outbound peer %d -- headers chain has insufficient work\n", pfrom.GetId()); + pfrom.fDisconnect = true; } } } - if (!pfrom->fDisconnect && IsOutboundDisconnectionCandidate(pfrom) && nodestate->pindexBestKnownBlock != nullptr && pfrom->m_tx_relay != nullptr) { - // If this is an outbound full-relay peer, check to see if we should protect - // it from the bad/lagging chain logic. - // Note that block-relay-only peers are already implicitly protected, so we - // only consider setting m_protect for the full-relay peers. + // If this is an outbound full-relay peer, check to see if we should protect + // it from the bad/lagging chain logic. + // Note that outbound block-relay peers are excluded from this protection, and + // thus always subject to eviction under the bad/lagging chain logic. + // See ChainSyncTimeoutState. + if (!pfrom.fDisconnect && pfrom.IsFullOutboundConn() && nodestate->pindexBestKnownBlock != nullptr) { if (g_outbound_peers_with_protect_from_disconnect < MAX_OUTBOUND_PEERS_TO_PROTECT_FROM_DISCONNECT && nodestate->pindexBestKnownBlock->nChainWork >= ::ChainActive().Tip()->nChainWork && !nodestate->m_chain_sync.m_protect) { - LogPrint(BCLog::NET, "Protecting outbound peer=%d from eviction\n", pfrom->GetId()); + LogPrint(BCLog::NET, "Protecting outbound peer=%d from eviction\n", pfrom.GetId()); nodestate->m_chain_sync.m_protect = true; ++g_outbound_peers_with_protect_from_disconnect; } } } - return true; + return; } -void static ProcessOrphanTx(CConnman* connman, std::set<uint256>& orphan_work_set, std::list<CTransactionRef>& removed_txn) EXCLUSIVE_LOCKS_REQUIRED(cs_main, g_cs_orphans) +/** + * Reconsider orphan transactions after a parent has been accepted to the mempool. + * + * @param[in/out] orphan_work_set The set of orphan transactions to reconsider. Generally only one + * orphan will be reconsidered on each call of this function. This set + * may be added to if accepting an orphan causes its children to be + * reconsidered. + */ +void PeerManager::ProcessOrphanTx(std::set<uint256>& orphan_work_set) { AssertLockHeld(cs_main); AssertLockHeld(g_cs_orphans); - std::set<NodeId> setMisbehaving; - bool done = false; - while (!done && !orphan_work_set.empty()) { + + while (!orphan_work_set.empty()) { const uint256 orphanHash = *orphan_work_set.begin(); orphan_work_set.erase(orphan_work_set.begin()); @@ -1834,18 +1975,13 @@ void static ProcessOrphanTx(CConnman* connman, std::set<uint256>& orphan_work_se if (orphan_it == mapOrphanTransactions.end()) continue; const CTransactionRef porphanTx = orphan_it->second.tx; - const CTransaction& orphanTx = *porphanTx; - NodeId fromPeer = orphan_it->second.fromPeer; - // Use a new TxValidationState because orphans come from different peers (and we call - // MaybePunishNodeForTx based on the source peer from the orphan map, not based on the peer - // that relayed the previous transaction). - TxValidationState orphan_state; - - if (setMisbehaving.count(fromPeer)) continue; - if (AcceptToMemoryPool(mempool, orphan_state, porphanTx, &removed_txn, false /* bypass_limits */, 0 /* nAbsurdFee */)) { + TxValidationState state; + std::list<CTransactionRef> removed_txn; + + if (AcceptToMemoryPool(m_mempool, state, porphanTx, &removed_txn, false /* bypass_limits */)) { LogPrint(BCLog::MEMPOOL, " accepted orphan tx %s\n", orphanHash.ToString()); - RelayTransaction(orphanHash, *connman); - for (unsigned int i = 0; i < orphanTx.vout.size(); i++) { + RelayTransaction(orphanHash, porphanTx->GetWitnessHash(), m_connman); + for (unsigned int i = 0; i < porphanTx->vout.size(); i++) { auto it_by_prev = mapOrphanTransactionsByPrev.find(COutPoint(orphanHash, i)); if (it_by_prev != mapOrphanTransactionsByPrev.end()) { for (const auto& elem : it_by_prev->second) { @@ -1854,63 +1990,293 @@ void static ProcessOrphanTx(CConnman* connman, std::set<uint256>& orphan_work_se } } EraseOrphanTx(orphanHash); - done = true; - } else if (orphan_state.GetResult() != TxValidationResult::TX_MISSING_INPUTS) { - if (orphan_state.IsInvalid()) { - // Punish peer that gave us an invalid orphan tx - if (MaybePunishNodeForTx(fromPeer, orphan_state)) { - setMisbehaving.insert(fromPeer); - } - LogPrint(BCLog::MEMPOOL, " invalid orphan tx %s\n", orphanHash.ToString()); + for (const CTransactionRef& removedTx : removed_txn) { + AddToCompactExtraTransactions(removedTx); + } + break; + } else if (state.GetResult() != TxValidationResult::TX_MISSING_INPUTS) { + if (state.IsInvalid()) { + LogPrint(BCLog::MEMPOOL, " invalid orphan tx %s from peer=%d. %s\n", + orphanHash.ToString(), + orphan_it->second.fromPeer, + state.ToString()); + // Maybe punish peer that gave us an invalid orphan tx + MaybePunishNodeForTx(orphan_it->second.fromPeer, state); } // Has inputs but not accepted to mempool // Probably non-standard or insufficient fee LogPrint(BCLog::MEMPOOL, " removed orphan tx %s\n", orphanHash.ToString()); - if (!orphanTx.HasWitness() && orphan_state.GetResult() != TxValidationResult::TX_WITNESS_MUTATED) { - // Do not use rejection cache for witness transactions or - // witness-stripped transactions, as they can have been malleated. - // See https://github.com/bitcoin/bitcoin/issues/8279 for details. + if (state.GetResult() != TxValidationResult::TX_WITNESS_STRIPPED) { + // We can add the wtxid of this transaction to our reject filter. + // Do not add txids of witness transactions or witness-stripped + // transactions to the filter, as they can have been malleated; + // adding such txids to the reject filter would potentially + // interfere with relay of valid transactions from peers that + // do not support wtxid-based relay. See + // https://github.com/bitcoin/bitcoin/issues/8279 for details. + // We can remove this restriction (and always add wtxids to + // the filter even for witness stripped transactions) once + // wtxid-based relay is broadly deployed. + // See also comments in https://github.com/bitcoin/bitcoin/pull/18044#discussion_r443419034 + // for concerns around weakening security of unupgraded nodes + // if we start doing this too early. assert(recentRejects); - recentRejects->insert(orphanHash); + recentRejects->insert(porphanTx->GetWitnessHash()); + // If the transaction failed for TX_INPUTS_NOT_STANDARD, + // then we know that the witness was irrelevant to the policy + // failure, since this check depends only on the txid + // (the scriptPubKey being spent is covered by the txid). + // Add the txid to the reject filter to prevent repeated + // processing of this transaction in the event that child + // transactions are later received (resulting in + // parent-fetching by txid via the orphan-handling logic). + if (state.GetResult() == TxValidationResult::TX_INPUTS_NOT_STANDARD && porphanTx->GetWitnessHash() != porphanTx->GetHash()) { + // We only add the txid if it differs from the wtxid, to + // avoid wasting entries in the rolling bloom filter. + recentRejects->insert(porphanTx->GetHash()); + } } EraseOrphanTx(orphanHash); - done = true; + break; } - mempool.check(&::ChainstateActive().CoinsTip()); } + m_mempool.check(&::ChainstateActive().CoinsTip()); } -bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStream& vRecv, int64_t nTimeReceived, const CChainParams& chainparams, CConnman* connman, BanMan* banman, const std::atomic<bool>& interruptMsgProc) +/** + * Validation logic for compact filters request handling. + * + * May disconnect from the peer in the case of a bad request. + * + * @param[in] peer The peer that we received the request from + * @param[in] chain_params Chain parameters + * @param[in] filter_type The filter type the request is for. Must be basic filters. + * @param[in] start_height The start height for the request + * @param[in] stop_hash The stop_hash for the request + * @param[in] max_height_diff The maximum number of items permitted to request, as specified in BIP 157 + * @param[out] stop_index The CBlockIndex for the stop_hash block, if the request can be serviced. + * @param[out] filter_index The filter index, if the request can be serviced. + * @return True if the request can be serviced. + */ +static bool PrepareBlockFilterRequest(CNode& peer, const CChainParams& chain_params, + BlockFilterType filter_type, uint32_t start_height, + const uint256& stop_hash, uint32_t max_height_diff, + const CBlockIndex*& stop_index, + BlockFilterIndex*& filter_index) { - LogPrint(BCLog::NET, "received: %s (%u bytes) peer=%d\n", SanitizeString(strCommand), vRecv.size(), pfrom->GetId()); - if (gArgs.IsArgSet("-dropmessagestest") && GetRand(gArgs.GetArg("-dropmessagestest", 0)) == 0) - { - LogPrintf("dropmessagestest DROPPING RECV MESSAGE\n"); - return true; + const bool supported_filter_type = + (filter_type == BlockFilterType::BASIC && + (peer.GetLocalServices() & NODE_COMPACT_FILTERS)); + if (!supported_filter_type) { + LogPrint(BCLog::NET, "peer %d requested unsupported block filter type: %d\n", + peer.GetId(), static_cast<uint8_t>(filter_type)); + peer.fDisconnect = true; + return false; } - - if (!(pfrom->GetLocalServices() & NODE_BLOOM) && - (strCommand == NetMsgType::FILTERLOAD || - strCommand == NetMsgType::FILTERADD)) { - if (pfrom->nVersion >= NO_BLOOM_VERSION) { - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 100); - return false; - } else { - pfrom->fDisconnect = true; + LOCK(cs_main); + stop_index = LookupBlockIndex(stop_hash); + + // Check that the stop block exists and the peer would be allowed to fetch it. + if (!stop_index || !BlockRequestAllowed(stop_index, chain_params.GetConsensus())) { + LogPrint(BCLog::NET, "peer %d requested invalid block hash: %s\n", + peer.GetId(), stop_hash.ToString()); + peer.fDisconnect = true; return false; } } - if (strCommand == NetMsgType::VERSION) { + uint32_t stop_height = stop_index->nHeight; + if (start_height > stop_height) { + LogPrint(BCLog::NET, "peer %d sent invalid getcfilters/getcfheaders with " /* Continued */ + "start height %d and stop height %d\n", + peer.GetId(), start_height, stop_height); + peer.fDisconnect = true; + return false; + } + if (stop_height - start_height >= max_height_diff) { + LogPrint(BCLog::NET, "peer %d requested too many cfilters/cfheaders: %d / %d\n", + peer.GetId(), stop_height - start_height + 1, max_height_diff); + peer.fDisconnect = true; + return false; + } + + filter_index = GetBlockFilterIndex(filter_type); + if (!filter_index) { + LogPrint(BCLog::NET, "Filter index for supported type %s not found\n", BlockFilterTypeName(filter_type)); + return false; + } + + return true; +} + +/** + * Handle a cfilters request. + * + * May disconnect from the peer in the case of a bad request. + * + * @param[in] peer The peer that we received the request from + * @param[in] vRecv The raw message received + * @param[in] chain_params Chain parameters + * @param[in] connman Pointer to the connection manager + */ +static void ProcessGetCFilters(CNode& peer, CDataStream& vRecv, const CChainParams& chain_params, + CConnman& connman) +{ + uint8_t filter_type_ser; + uint32_t start_height; + uint256 stop_hash; + + vRecv >> filter_type_ser >> start_height >> stop_hash; + + const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser); + + const CBlockIndex* stop_index; + BlockFilterIndex* filter_index; + if (!PrepareBlockFilterRequest(peer, chain_params, filter_type, start_height, stop_hash, + MAX_GETCFILTERS_SIZE, stop_index, filter_index)) { + return; + } + + std::vector<BlockFilter> filters; + if (!filter_index->LookupFilterRange(start_height, stop_index, filters)) { + LogPrint(BCLog::NET, "Failed to find block filter in index: filter_type=%s, start_height=%d, stop_hash=%s\n", + BlockFilterTypeName(filter_type), start_height, stop_hash.ToString()); + return; + } + + for (const auto& filter : filters) { + CSerializedNetMsg msg = CNetMsgMaker(peer.GetCommonVersion()) + .Make(NetMsgType::CFILTER, filter); + connman.PushMessage(&peer, std::move(msg)); + } +} + +/** + * Handle a cfheaders request. + * + * May disconnect from the peer in the case of a bad request. + * + * @param[in] peer The peer that we received the request from + * @param[in] vRecv The raw message received + * @param[in] chain_params Chain parameters + * @param[in] connman Pointer to the connection manager + */ +static void ProcessGetCFHeaders(CNode& peer, CDataStream& vRecv, const CChainParams& chain_params, + CConnman& connman) +{ + uint8_t filter_type_ser; + uint32_t start_height; + uint256 stop_hash; + + vRecv >> filter_type_ser >> start_height >> stop_hash; + + const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser); + + const CBlockIndex* stop_index; + BlockFilterIndex* filter_index; + if (!PrepareBlockFilterRequest(peer, chain_params, filter_type, start_height, stop_hash, + MAX_GETCFHEADERS_SIZE, stop_index, filter_index)) { + return; + } + + uint256 prev_header; + if (start_height > 0) { + const CBlockIndex* const prev_block = + stop_index->GetAncestor(static_cast<int>(start_height - 1)); + if (!filter_index->LookupFilterHeader(prev_block, prev_header)) { + LogPrint(BCLog::NET, "Failed to find block filter header in index: filter_type=%s, block_hash=%s\n", + BlockFilterTypeName(filter_type), prev_block->GetBlockHash().ToString()); + return; + } + } + + std::vector<uint256> filter_hashes; + if (!filter_index->LookupFilterHashRange(start_height, stop_index, filter_hashes)) { + LogPrint(BCLog::NET, "Failed to find block filter hashes in index: filter_type=%s, start_height=%d, stop_hash=%s\n", + BlockFilterTypeName(filter_type), start_height, stop_hash.ToString()); + return; + } + + CSerializedNetMsg msg = CNetMsgMaker(peer.GetCommonVersion()) + .Make(NetMsgType::CFHEADERS, + filter_type_ser, + stop_index->GetBlockHash(), + prev_header, + filter_hashes); + connman.PushMessage(&peer, std::move(msg)); +} + +/** + * Handle a getcfcheckpt request. + * + * May disconnect from the peer in the case of a bad request. + * + * @param[in] peer The peer that we received the request from + * @param[in] vRecv The raw message received + * @param[in] chain_params Chain parameters + * @param[in] connman Pointer to the connection manager + */ +static void ProcessGetCFCheckPt(CNode& peer, CDataStream& vRecv, const CChainParams& chain_params, + CConnman& connman) +{ + uint8_t filter_type_ser; + uint256 stop_hash; + + vRecv >> filter_type_ser >> stop_hash; + + const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser); + + const CBlockIndex* stop_index; + BlockFilterIndex* filter_index; + if (!PrepareBlockFilterRequest(peer, chain_params, filter_type, /*start_height=*/0, stop_hash, + /*max_height_diff=*/std::numeric_limits<uint32_t>::max(), + stop_index, filter_index)) { + return; + } + + std::vector<uint256> headers(stop_index->nHeight / CFCHECKPT_INTERVAL); + + // Populate headers. + const CBlockIndex* block_index = stop_index; + for (int i = headers.size() - 1; i >= 0; i--) { + int height = (i + 1) * CFCHECKPT_INTERVAL; + block_index = block_index->GetAncestor(height); + + if (!filter_index->LookupFilterHeader(block_index, headers[i])) { + LogPrint(BCLog::NET, "Failed to find block filter header in index: filter_type=%s, block_hash=%s\n", + BlockFilterTypeName(filter_type), block_index->GetBlockHash().ToString()); + return; + } + } + + CSerializedNetMsg msg = CNetMsgMaker(peer.GetCommonVersion()) + .Make(NetMsgType::CFCHECKPT, + filter_type_ser, + stop_index->GetBlockHash(), + headers); + connman.PushMessage(&peer, std::move(msg)); +} + +void PeerManager::ProcessMessage(CNode& pfrom, const std::string& msg_type, CDataStream& vRecv, + const std::chrono::microseconds time_received, + const std::atomic<bool>& interruptMsgProc) +{ + LogPrint(BCLog::NET, "received: %s (%u bytes) peer=%d\n", SanitizeString(msg_type), vRecv.size(), pfrom.GetId()); + if (gArgs.IsArgSet("-dropmessagestest") && GetRand(gArgs.GetArg("-dropmessagestest", 0)) == 0) + { + LogPrintf("dropmessagestest DROPPING RECV MESSAGE\n"); + return; + } + + + if (msg_type == NetMsgType::VERSION) { // Each connection can only send one version message - if (pfrom->nVersion != 0) + if (pfrom.nVersion != 0) { - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 1); - return false; + Misbehaving(pfrom.GetId(), 1, "redundant version message"); + return; } int64_t nTime; @@ -1920,30 +2286,28 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr uint64_t nServiceInt; ServiceFlags nServices; int nVersion; - int nSendVersion; std::string cleanSubVer; int nStartingHeight = -1; bool fRelay = true; vRecv >> nVersion >> nServiceInt >> nTime >> addrMe; - nSendVersion = std::min(nVersion, PROTOCOL_VERSION); nServices = ServiceFlags(nServiceInt); - if (!pfrom->fInbound) + if (!pfrom.IsInboundConn()) { - connman->SetServices(pfrom->addr, nServices); + m_connman.SetServices(pfrom.addr, nServices); } - if (!pfrom->fInbound && !pfrom->fFeeler && !pfrom->m_manual_connection && !HasAllDesirableServiceFlags(nServices)) + if (pfrom.ExpectServicesFromConn() && !HasAllDesirableServiceFlags(nServices)) { - LogPrint(BCLog::NET, "peer=%d does not offer the expected services (%08x offered, %08x expected); disconnecting\n", pfrom->GetId(), nServices, GetDesirableServiceFlags(nServices)); - pfrom->fDisconnect = true; - return false; + LogPrint(BCLog::NET, "peer=%d does not offer the expected services (%08x offered, %08x expected); disconnecting\n", pfrom.GetId(), nServices, GetDesirableServiceFlags(nServices)); + pfrom.fDisconnect = true; + return; } if (nVersion < MIN_PEER_PROTO_VERSION) { // disconnect from peers older than this proto version - LogPrint(BCLog::NET, "peer=%d using obsolete version %i; disconnecting\n", pfrom->GetId(), nVersion); - pfrom->fDisconnect = true; - return false; + LogPrint(BCLog::NET, "peer=%d using obsolete version %i; disconnecting\n", pfrom.GetId(), nVersion); + pfrom.fDisconnect = true; + return; } if (!vRecv.empty()) @@ -1959,145 +2323,166 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr if (!vRecv.empty()) vRecv >> fRelay; // Disconnect if we connected to ourself - if (pfrom->fInbound && !connman->CheckIncomingNonce(nNonce)) + if (pfrom.IsInboundConn() && !m_connman.CheckIncomingNonce(nNonce)) { - LogPrintf("connected to self at %s, disconnecting\n", pfrom->addr.ToString()); - pfrom->fDisconnect = true; - return true; + LogPrintf("connected to self at %s, disconnecting\n", pfrom.addr.ToString()); + pfrom.fDisconnect = true; + return; } - if (pfrom->fInbound && addrMe.IsRoutable()) + if (pfrom.IsInboundConn() && addrMe.IsRoutable()) { SeenLocal(addrMe); } // Be shy and don't send version until we hear - if (pfrom->fInbound) - PushNodeVersion(pfrom, connman, GetAdjustedTime()); + if (pfrom.IsInboundConn()) + PushNodeVersion(pfrom, m_connman, GetAdjustedTime()); + + // Change version + const int greatest_common_version = std::min(nVersion, PROTOCOL_VERSION); + pfrom.SetCommonVersion(greatest_common_version); + pfrom.nVersion = nVersion; - connman->PushMessage(pfrom, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERACK)); + const CNetMsgMaker msg_maker(greatest_common_version); + + if (greatest_common_version >= WTXID_RELAY_VERSION) { + m_connman.PushMessage(&pfrom, msg_maker.Make(NetMsgType::WTXIDRELAY)); + } - pfrom->nServices = nServices; - pfrom->SetAddrLocal(addrMe); + m_connman.PushMessage(&pfrom, msg_maker.Make(NetMsgType::VERACK)); + + // Signal ADDRv2 support (BIP155). + m_connman.PushMessage(&pfrom, msg_maker.Make(NetMsgType::SENDADDRV2)); + + pfrom.nServices = nServices; + pfrom.SetAddrLocal(addrMe); { - LOCK(pfrom->cs_SubVer); - pfrom->cleanSubVer = cleanSubVer; + LOCK(pfrom.cs_SubVer); + pfrom.cleanSubVer = cleanSubVer; } - pfrom->nStartingHeight = nStartingHeight; + pfrom.nStartingHeight = nStartingHeight; // set nodes not relaying blocks and tx and not serving (parts) of the historical blockchain as "clients" - pfrom->fClient = (!(nServices & NODE_NETWORK) && !(nServices & NODE_NETWORK_LIMITED)); + pfrom.fClient = (!(nServices & NODE_NETWORK) && !(nServices & NODE_NETWORK_LIMITED)); // set nodes not capable of serving the complete blockchain history as "limited nodes" - pfrom->m_limited_node = (!(nServices & NODE_NETWORK) && (nServices & NODE_NETWORK_LIMITED)); + pfrom.m_limited_node = (!(nServices & NODE_NETWORK) && (nServices & NODE_NETWORK_LIMITED)); - if (pfrom->m_tx_relay != nullptr) { - LOCK(pfrom->m_tx_relay->cs_filter); - pfrom->m_tx_relay->fRelayTxes = fRelay; // set to true after we get the first filter* message + if (pfrom.m_tx_relay != nullptr) { + LOCK(pfrom.m_tx_relay->cs_filter); + pfrom.m_tx_relay->fRelayTxes = fRelay; // set to true after we get the first filter* message } - // Change version - pfrom->SetSendVersion(nSendVersion); - pfrom->nVersion = nVersion; - if((nServices & NODE_WITNESS)) { LOCK(cs_main); - State(pfrom->GetId())->fHaveWitness = true; + State(pfrom.GetId())->fHaveWitness = true; } // Potentially mark this peer as a preferred download peer. { LOCK(cs_main); - UpdatePreferredDownload(pfrom, State(pfrom->GetId())); + UpdatePreferredDownload(pfrom, State(pfrom.GetId())); } - if (!pfrom->fInbound && pfrom->IsAddrRelayPeer()) - { - // Advertise our address + if (!pfrom.IsInboundConn() && !pfrom.IsBlockOnlyConn()) { + // For outbound peers, we try to relay our address (so that other + // nodes can try to find us more quickly, as we have no guarantee + // that an outbound peer is even aware of how to reach us) and do a + // one-time address fetch (to help populate/update our addrman). If + // we're starting up for the first time, our addrman may be pretty + // empty and no one will know who we are, so these mechanisms are + // important to help us connect to the network. + // + // We also update the addrman to record connection success for + // these peers (which include OUTBOUND_FULL_RELAY and FEELER + // connections) so that addrman will have an up-to-date notion of + // which peers are online and available. + // + // We skip these operations for BLOCK_RELAY peers to avoid + // potentially leaking information about our BLOCK_RELAY + // connections via the addrman or address relay. if (fListen && !::ChainstateActive().IsInitialBlockDownload()) { - CAddress addr = GetLocalAddress(&pfrom->addr, pfrom->GetLocalServices()); + CAddress addr = GetLocalAddress(&pfrom.addr, pfrom.GetLocalServices()); FastRandomContext insecure_rand; if (addr.IsRoutable()) { LogPrint(BCLog::NET, "ProcessMessages: advertising address %s\n", addr.ToString()); - pfrom->PushAddress(addr, insecure_rand); - } else if (IsPeerAddrLocalGood(pfrom)) { + pfrom.PushAddress(addr, insecure_rand); + } else if (IsPeerAddrLocalGood(&pfrom)) { addr.SetIP(addrMe); LogPrint(BCLog::NET, "ProcessMessages: advertising address %s\n", addr.ToString()); - pfrom->PushAddress(addr, insecure_rand); + pfrom.PushAddress(addr, insecure_rand); } } // Get recent addresses - if (pfrom->fOneShot || pfrom->nVersion >= CADDR_TIME_VERSION || connman->GetAddressCount() < 1000) - { - connman->PushMessage(pfrom, CNetMsgMaker(nSendVersion).Make(NetMsgType::GETADDR)); - pfrom->fGetAddr = true; - } - connman->MarkAddressGood(pfrom->addr); + m_connman.PushMessage(&pfrom, CNetMsgMaker(greatest_common_version).Make(NetMsgType::GETADDR)); + pfrom.fGetAddr = true; + + // Moves address from New to Tried table in Addrman, resolves + // tried-table collisions, etc. + m_connman.MarkAddressGood(pfrom.addr); } std::string remoteAddr; if (fLogIPs) - remoteAddr = ", peeraddr=" + pfrom->addr.ToString(); + remoteAddr = ", peeraddr=" + pfrom.addr.ToString(); LogPrint(BCLog::NET, "receive version message: %s: version %d, blocks=%d, us=%s, peer=%d%s\n", - cleanSubVer, pfrom->nVersion, - pfrom->nStartingHeight, addrMe.ToString(), pfrom->GetId(), + cleanSubVer, pfrom.nVersion, + pfrom.nStartingHeight, addrMe.ToString(), pfrom.GetId(), remoteAddr); int64_t nTimeOffset = nTime - GetTime(); - pfrom->nTimeOffset = nTimeOffset; - AddTimeData(pfrom->addr, nTimeOffset); + pfrom.nTimeOffset = nTimeOffset; + AddTimeData(pfrom.addr, nTimeOffset); // If the peer is old enough to have the old alert system, send it the final alert. - if (pfrom->nVersion <= 70012) { + if (greatest_common_version <= 70012) { CDataStream finalAlert(ParseHex("60010000000000000000000000ffffff7f00000000ffffff7ffeffff7f01ffffff7f00000000ffffff7f00ffffff7f002f555247454e543a20416c657274206b657920636f6d70726f6d697365642c2075706772616465207265717569726564004630440220653febd6410f470f6bae11cad19c48413becb1ac2c17f908fd0fd53bdc3abd5202206d0e9c96fe88d4a0f01ed9dedae2b6f9e00da94cad0fecaae66ecf689bf71b50"), SER_NETWORK, PROTOCOL_VERSION); - connman->PushMessage(pfrom, CNetMsgMaker(nSendVersion).Make("alert", finalAlert)); + m_connman.PushMessage(&pfrom, CNetMsgMaker(greatest_common_version).Make("alert", finalAlert)); } // Feeler connections exist only to verify if address is online. - if (pfrom->fFeeler) { - assert(pfrom->fInbound == false); - pfrom->fDisconnect = true; + if (pfrom.IsFeelerConn()) { + pfrom.fDisconnect = true; } - return true; + return; } - if (pfrom->nVersion == 0) { + if (pfrom.nVersion == 0) { // Must have a version message before anything else - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 1); - return false; + Misbehaving(pfrom.GetId(), 1, "non-version message before version handshake"); + return; } // At this point, the outgoing message serialization version can't change. - const CNetMsgMaker msgMaker(pfrom->GetSendVersion()); + const CNetMsgMaker msgMaker(pfrom.GetCommonVersion()); - if (strCommand == NetMsgType::VERACK) - { - pfrom->SetRecvVersion(std::min(pfrom->nVersion.load(), PROTOCOL_VERSION)); + if (msg_type == NetMsgType::VERACK) { + if (pfrom.fSuccessfullyConnected) return; - if (!pfrom->fInbound) { + if (!pfrom.IsInboundConn()) { // Mark this node as currently connected, so we update its timestamp later. LOCK(cs_main); - State(pfrom->GetId())->fCurrentlyConnected = true; + State(pfrom.GetId())->fCurrentlyConnected = true; LogPrintf("New outbound peer connected: version: %d, blocks=%d, peer=%d%s (%s)\n", - pfrom->nVersion.load(), pfrom->nStartingHeight, - pfrom->GetId(), (fLogIPs ? strprintf(", peeraddr=%s", pfrom->addr.ToString()) : ""), - pfrom->m_tx_relay == nullptr ? "block-relay" : "full-relay"); + pfrom.nVersion.load(), pfrom.nStartingHeight, + pfrom.GetId(), (fLogIPs ? strprintf(", peeraddr=%s", pfrom.addr.ToString()) : ""), + pfrom.m_tx_relay == nullptr ? "block-relay" : "full-relay"); } - if (pfrom->nVersion >= SENDHEADERS_VERSION) { + if (pfrom.GetCommonVersion() >= SENDHEADERS_VERSION) { // Tell our peer we prefer to receive headers rather than inv's // We send this to non-NODE NETWORK peers as well, because even // non-NODE NETWORK peers can announce blocks (such as pruning // nodes) - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDHEADERS)); + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::SENDHEADERS)); } - if (pfrom->nVersion >= SHORT_IDS_BLOCKS_VERSION) { + if (pfrom.GetCommonVersion() >= SHORT_IDS_BLOCKS_VERSION) { // Tell our peer we are willing to provide version 1 or 2 cmpctblocks // However, we do not request new block announcements using // cmpctblock messages. @@ -2105,37 +2490,59 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // they may wish to request compact blocks from us bool fAnnounceUsingCMPCTBLOCK = false; uint64_t nCMPCTBLOCKVersion = 2; - if (pfrom->GetLocalServices() & NODE_WITNESS) - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion)); + if (pfrom.GetLocalServices() & NODE_WITNESS) + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion)); nCMPCTBLOCKVersion = 1; - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion)); + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion)); } - pfrom->fSuccessfullyConnected = true; - return true; + pfrom.fSuccessfullyConnected = true; + return; } - if (!pfrom->fSuccessfullyConnected) { - // Must have a verack message before anything else - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 1); - return false; + // Feature negotiation of wtxidrelay should happen between VERSION and + // VERACK, to avoid relay problems from switching after a connection is up + if (msg_type == NetMsgType::WTXIDRELAY) { + if (pfrom.fSuccessfullyConnected) { + // Disconnect peers that send wtxidrelay message after VERACK; this + // must be negotiated between VERSION and VERACK. + pfrom.fDisconnect = true; + return; + } + if (pfrom.GetCommonVersion() >= WTXID_RELAY_VERSION) { + LOCK(cs_main); + if (!State(pfrom.GetId())->m_wtxid_relay) { + State(pfrom.GetId())->m_wtxid_relay = true; + g_wtxid_relay_peers++; + } + } + return; } - if (strCommand == NetMsgType::ADDR) { + if (!pfrom.fSuccessfullyConnected) { + LogPrint(BCLog::NET, "Unsupported message \"%s\" prior to verack from peer=%d\n", SanitizeString(msg_type), pfrom.GetId()); + return; + } + + if (msg_type == NetMsgType::ADDR || msg_type == NetMsgType::ADDRV2) { + int stream_version = vRecv.GetVersion(); + if (msg_type == NetMsgType::ADDRV2) { + // Add ADDRV2_FORMAT to the version so that the CNetAddr and CAddress + // unserialize methods know that an address in v2 format is coming. + stream_version |= ADDRV2_FORMAT; + } + + OverrideStream<CDataStream> s(&vRecv, vRecv.GetType(), stream_version); std::vector<CAddress> vAddr; - vRecv >> vAddr; - // Don't want addr from older versions unless seeding - if (pfrom->nVersion < CADDR_TIME_VERSION && connman->GetAddressCount() > 1000) - return true; - if (!pfrom->IsAddrRelayPeer()) { - return true; + s >> vAddr; + + if (!pfrom.RelayAddrsWithConn()) { + return; } - if (vAddr.size() > 1000) + if (vAddr.size() > MAX_ADDR_TO_SEND) { - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 20, strprintf("message addr size() = %u", vAddr.size())); - return false; + Misbehaving(pfrom.GetId(), 20, strprintf("%s message size = %u", msg_type, vAddr.size())); + return; } // Store the new addresses @@ -2145,7 +2552,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr for (CAddress& addr : vAddr) { if (interruptMsgProc) - return true; + return; // We only bother storing full nodes, though this may include // things which we would not make an outbound connection to, in @@ -2155,147 +2562,166 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60) addr.nTime = nNow - 5 * 24 * 60 * 60; - pfrom->AddAddressKnown(addr); - if (banman->IsBanned(addr)) continue; // Do not process banned addresses beyond remembering we received them + pfrom.AddAddressKnown(addr); + if (m_banman && (m_banman->IsDiscouraged(addr) || m_banman->IsBanned(addr))) { + // Do not process banned/discouraged addresses beyond remembering we received them + continue; + } bool fReachable = IsReachable(addr); - if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable()) + if (addr.nTime > nSince && !pfrom.fGetAddr && vAddr.size() <= 10 && addr.IsRoutable()) { // Relay to a limited number of other nodes - RelayAddress(addr, fReachable, connman); + RelayAddress(addr, fReachable, m_connman); } // Do not store addresses outside our network if (fReachable) vAddrOk.push_back(addr); } - connman->AddNewAddresses(vAddrOk, pfrom->addr, 2 * 60 * 60); + m_connman.AddNewAddresses(vAddrOk, pfrom.addr, 2 * 60 * 60); if (vAddr.size() < 1000) - pfrom->fGetAddr = false; - if (pfrom->fOneShot) - pfrom->fDisconnect = true; - return true; + pfrom.fGetAddr = false; + if (pfrom.IsAddrFetchConn()) + pfrom.fDisconnect = true; + return; + } + + if (msg_type == NetMsgType::SENDADDRV2) { + pfrom.m_wants_addrv2 = true; + return; } - if (strCommand == NetMsgType::SENDHEADERS) { + if (msg_type == NetMsgType::SENDHEADERS) { LOCK(cs_main); - State(pfrom->GetId())->fPreferHeaders = true; - return true; + State(pfrom.GetId())->fPreferHeaders = true; + return; } - if (strCommand == NetMsgType::SENDCMPCT) { + if (msg_type == NetMsgType::SENDCMPCT) { bool fAnnounceUsingCMPCTBLOCK = false; uint64_t nCMPCTBLOCKVersion = 0; vRecv >> fAnnounceUsingCMPCTBLOCK >> nCMPCTBLOCKVersion; - if (nCMPCTBLOCKVersion == 1 || ((pfrom->GetLocalServices() & NODE_WITNESS) && nCMPCTBLOCKVersion == 2)) { + if (nCMPCTBLOCKVersion == 1 || ((pfrom.GetLocalServices() & NODE_WITNESS) && nCMPCTBLOCKVersion == 2)) { LOCK(cs_main); // fProvidesHeaderAndIDs is used to "lock in" version of compact blocks we send (fWantsCmpctWitness) - if (!State(pfrom->GetId())->fProvidesHeaderAndIDs) { - State(pfrom->GetId())->fProvidesHeaderAndIDs = true; - State(pfrom->GetId())->fWantsCmpctWitness = nCMPCTBLOCKVersion == 2; + if (!State(pfrom.GetId())->fProvidesHeaderAndIDs) { + State(pfrom.GetId())->fProvidesHeaderAndIDs = true; + State(pfrom.GetId())->fWantsCmpctWitness = nCMPCTBLOCKVersion == 2; } - if (State(pfrom->GetId())->fWantsCmpctWitness == (nCMPCTBLOCKVersion == 2)) // ignore later version announces - State(pfrom->GetId())->fPreferHeaderAndIDs = fAnnounceUsingCMPCTBLOCK; - if (!State(pfrom->GetId())->fSupportsDesiredCmpctVersion) { - if (pfrom->GetLocalServices() & NODE_WITNESS) - State(pfrom->GetId())->fSupportsDesiredCmpctVersion = (nCMPCTBLOCKVersion == 2); + if (State(pfrom.GetId())->fWantsCmpctWitness == (nCMPCTBLOCKVersion == 2)) // ignore later version announces + State(pfrom.GetId())->fPreferHeaderAndIDs = fAnnounceUsingCMPCTBLOCK; + if (!State(pfrom.GetId())->fSupportsDesiredCmpctVersion) { + if (pfrom.GetLocalServices() & NODE_WITNESS) + State(pfrom.GetId())->fSupportsDesiredCmpctVersion = (nCMPCTBLOCKVersion == 2); else - State(pfrom->GetId())->fSupportsDesiredCmpctVersion = (nCMPCTBLOCKVersion == 1); + State(pfrom.GetId())->fSupportsDesiredCmpctVersion = (nCMPCTBLOCKVersion == 1); } } - return true; + return; } - if (strCommand == NetMsgType::INV) { + if (msg_type == NetMsgType::INV) { std::vector<CInv> vInv; vRecv >> vInv; if (vInv.size() > MAX_INV_SZ) { - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 20, strprintf("message inv size() = %u", vInv.size())); - return false; + Misbehaving(pfrom.GetId(), 20, strprintf("inv message size = %u", vInv.size())); + return; } // We won't accept tx inv's if we're in blocks-only mode, or this is a // block-relay-only peer - bool fBlocksOnly = !g_relay_txes || (pfrom->m_tx_relay == nullptr); + bool fBlocksOnly = !g_relay_txes || (pfrom.m_tx_relay == nullptr); - // Allow whitelisted peers to send data other than blocks in blocks only mode if whitelistrelay is true - if (pfrom->HasPermission(PF_RELAY)) + // Allow peers with relay permission to send data other than blocks in blocks only mode + if (pfrom.HasPermission(PF_RELAY)) { fBlocksOnly = false; + } LOCK(cs_main); - uint32_t nFetchFlags = GetFetchFlags(pfrom); const auto current_time = GetTime<std::chrono::microseconds>(); + uint256* best_block{nullptr}; - for (CInv &inv : vInv) - { - if (interruptMsgProc) - return true; - - bool fAlreadyHave = AlreadyHave(inv); - LogPrint(BCLog::NET, "got inv: %s %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom->GetId()); + for (CInv& inv : vInv) { + if (interruptMsgProc) return; - if (inv.type == MSG_TX) { - inv.type |= nFetchFlags; + // Ignore INVs that don't match wtxidrelay setting. + // Note that orphan parent fetching always uses MSG_TX GETDATAs regardless of the wtxidrelay setting. + // This is fine as no INV messages are involved in that process. + if (State(pfrom.GetId())->m_wtxid_relay) { + if (inv.IsMsgTx()) continue; + } else { + if (inv.IsMsgWtx()) continue; } - if (inv.type == MSG_BLOCK) { - UpdateBlockAvailability(pfrom->GetId(), inv.hash); + if (inv.IsMsgBlk()) { + const bool fAlreadyHave = AlreadyHaveBlock(inv.hash); + LogPrint(BCLog::NET, "got inv: %s %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom.GetId()); + + UpdateBlockAvailability(pfrom.GetId(), inv.hash); if (!fAlreadyHave && !fImporting && !fReindex && !mapBlocksInFlight.count(inv.hash)) { - // We used to request the full block here, but since headers-announcements are now the - // primary method of announcement on the network, and since, in the case that a node - // fell back to inv we probably have a reorg which we should get the headers for first, - // we now only provide a getheaders response here. When we receive the headers, we will - // then ask for the blocks we need. - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexBestHeader), inv.hash)); - LogPrint(BCLog::NET, "getheaders (%d) %s to peer=%d\n", pindexBestHeader->nHeight, inv.hash.ToString(), pfrom->GetId()); + // Headers-first is the primary method of announcement on + // the network. If a node fell back to sending blocks by inv, + // it's probably for a re-org. The final block hash + // provided should be the highest, so send a getheaders and + // then fetch the blocks we need to catch up. + best_block = &inv.hash; } - } - else - { - pfrom->AddInventoryKnown(inv); + } else if (inv.IsGenTxMsg()) { + const GenTxid gtxid = ToGenTxid(inv); + const bool fAlreadyHave = AlreadyHaveTx(gtxid, m_mempool); + LogPrint(BCLog::NET, "got inv: %s %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom.GetId()); + + pfrom.AddKnownTx(inv.hash); if (fBlocksOnly) { - LogPrint(BCLog::NET, "transaction (%s) inv sent in violation of protocol, disconnecting peer=%d\n", inv.hash.ToString(), pfrom->GetId()); - pfrom->fDisconnect = true; - return true; - } else if (!fAlreadyHave && !fImporting && !fReindex && !::ChainstateActive().IsInitialBlockDownload()) { - RequestTx(State(pfrom->GetId()), inv.hash, current_time); + LogPrint(BCLog::NET, "transaction (%s) inv sent in violation of protocol, disconnecting peer=%d\n", inv.hash.ToString(), pfrom.GetId()); + pfrom.fDisconnect = true; + return; + } else if (!fAlreadyHave && !m_chainman.ActiveChainstate().IsInitialBlockDownload()) { + AddTxAnnouncement(pfrom, gtxid, current_time); } + } else { + LogPrint(BCLog::NET, "Unknown inv type \"%s\" received from peer=%d\n", inv.ToString(), pfrom.GetId()); } } - return true; + + if (best_block != nullptr) { + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexBestHeader), *best_block)); + LogPrint(BCLog::NET, "getheaders (%d) %s to peer=%d\n", pindexBestHeader->nHeight, best_block->ToString(), pfrom.GetId()); + } + + return; } - if (strCommand == NetMsgType::GETDATA) { + if (msg_type == NetMsgType::GETDATA) { std::vector<CInv> vInv; vRecv >> vInv; if (vInv.size() > MAX_INV_SZ) { - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 20, strprintf("message getdata size() = %u", vInv.size())); - return false; + Misbehaving(pfrom.GetId(), 20, strprintf("getdata message size = %u", vInv.size())); + return; } - LogPrint(BCLog::NET, "received getdata (%u invsz) peer=%d\n", vInv.size(), pfrom->GetId()); + LogPrint(BCLog::NET, "received getdata (%u invsz) peer=%d\n", vInv.size(), pfrom.GetId()); if (vInv.size() > 0) { - LogPrint(BCLog::NET, "received getdata for: %s peer=%d\n", vInv[0].ToString(), pfrom->GetId()); + LogPrint(BCLog::NET, "received getdata for: %s peer=%d\n", vInv[0].ToString(), pfrom.GetId()); } - pfrom->vRecvGetData.insert(pfrom->vRecvGetData.end(), vInv.begin(), vInv.end()); - ProcessGetData(pfrom, chainparams, connman, interruptMsgProc); - return true; + pfrom.vRecvGetData.insert(pfrom.vRecvGetData.end(), vInv.begin(), vInv.end()); + ProcessGetData(pfrom, m_chainparams, m_connman, m_mempool, interruptMsgProc); + return; } - if (strCommand == NetMsgType::GETBLOCKS) { + if (msg_type == NetMsgType::GETBLOCKS) { CBlockLocator locator; uint256 hashStop; vRecv >> locator >> hashStop; if (locator.vHave.size() > MAX_LOCATOR_SZ) { - LogPrint(BCLog::NET, "getblocks locator size %lld > %d, disconnect peer=%d\n", locator.vHave.size(), MAX_LOCATOR_SZ, pfrom->GetId()); - pfrom->fDisconnect = true; - return true; + LogPrint(BCLog::NET, "getblocks locator size %lld > %d, disconnect peer=%d\n", locator.vHave.size(), MAX_LOCATOR_SZ, pfrom.GetId()); + pfrom.fDisconnect = true; + return; } // We might have announced the currently-being-connected tip using a @@ -2312,8 +2738,8 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr a_recent_block = most_recent_block; } BlockValidationState state; - if (!ActivateBestChain(state, Params(), a_recent_block)) { - LogPrint(BCLog::NET, "failed to activate chain (%s)\n", FormatStateMessage(state)); + if (!ActivateBestChain(state, m_chainparams, a_recent_block)) { + LogPrint(BCLog::NET, "failed to activate chain (%s)\n", state.ToString()); } } @@ -2326,7 +2752,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr if (pindex) pindex = ::ChainActive().Next(pindex); int nLimit = 500; - LogPrint(BCLog::NET, "getblocks %d to %s limit %d from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), nLimit, pfrom->GetId()); + LogPrint(BCLog::NET, "getblocks %d to %s limit %d from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), nLimit, pfrom.GetId()); for (; pindex; pindex = ::ChainActive().Next(pindex)) { if (pindex->GetBlockHash() == hashStop) @@ -2336,26 +2762,26 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr } // If pruning, don't inv blocks unless we have on disk and are likely to still have // for some reasonable time window (1 hour) that block relay might require. - const int nPrunedBlocksLikelyToHave = MIN_BLOCKS_TO_KEEP - 3600 / chainparams.GetConsensus().nPowTargetSpacing; + const int nPrunedBlocksLikelyToHave = MIN_BLOCKS_TO_KEEP - 3600 / m_chainparams.GetConsensus().nPowTargetSpacing; if (fPruneMode && (!(pindex->nStatus & BLOCK_HAVE_DATA) || pindex->nHeight <= ::ChainActive().Tip()->nHeight - nPrunedBlocksLikelyToHave)) { LogPrint(BCLog::NET, " getblocks stopping, pruned or too old block at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString()); break; } - pfrom->PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash())); + WITH_LOCK(pfrom.cs_inventory, pfrom.vInventoryBlockToSend.push_back(pindex->GetBlockHash())); if (--nLimit <= 0) { // When this block is requested, we'll send an inv that'll // trigger the peer to getblocks the next batch of inventory. LogPrint(BCLog::NET, " getblocks stopping at limit %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString()); - pfrom->hashContinue = pindex->GetBlockHash(); + pfrom.hashContinue = pindex->GetBlockHash(); break; } } - return true; + return; } - if (strCommand == NetMsgType::GETBLOCKTXN) { + if (msg_type == NetMsgType::GETBLOCKTXN) { BlockTransactionsRequest req; vRecv >> req; @@ -2367,16 +2793,16 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // Unlock cs_most_recent_block to avoid cs_main lock inversion } if (recent_block) { - SendBlockTransactions(*recent_block, req, pfrom, connman); - return true; + SendBlockTransactions(pfrom, *recent_block, req); + return; } LOCK(cs_main); const CBlockIndex* pindex = LookupBlockIndex(req.blockhash); if (!pindex || !(pindex->nStatus & BLOCK_HAVE_DATA)) { - LogPrint(BCLog::NET, "Peer %d sent us a getblocktxn for a block we don't have\n", pfrom->GetId()); - return true; + LogPrint(BCLog::NET, "Peer %d sent us a getblocktxn for a block we don't have\n", pfrom.GetId()); + return; } if (pindex->nHeight < ::ChainActive().Height() - MAX_BLOCKTXN_DEPTH) { @@ -2387,53 +2813,53 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // might maliciously send lots of getblocktxn requests to trigger // expensive disk reads, because it will require the peer to // actually receive all the data read from disk over the network. - LogPrint(BCLog::NET, "Peer %d sent us a getblocktxn for a block > %i deep\n", pfrom->GetId(), MAX_BLOCKTXN_DEPTH); + LogPrint(BCLog::NET, "Peer %d sent us a getblocktxn for a block > %i deep\n", pfrom.GetId(), MAX_BLOCKTXN_DEPTH); CInv inv; - inv.type = State(pfrom->GetId())->fWantsCmpctWitness ? MSG_WITNESS_BLOCK : MSG_BLOCK; + inv.type = State(pfrom.GetId())->fWantsCmpctWitness ? MSG_WITNESS_BLOCK : MSG_BLOCK; inv.hash = req.blockhash; - pfrom->vRecvGetData.push_back(inv); + pfrom.vRecvGetData.push_back(inv); // The message processing loop will go around again (without pausing) and we'll respond then (without cs_main) - return true; + return; } CBlock block; - bool ret = ReadBlockFromDisk(block, pindex, chainparams.GetConsensus()); + bool ret = ReadBlockFromDisk(block, pindex, m_chainparams.GetConsensus()); assert(ret); - SendBlockTransactions(block, req, pfrom, connman); - return true; + SendBlockTransactions(pfrom, block, req); + return; } - if (strCommand == NetMsgType::GETHEADERS) { + if (msg_type == NetMsgType::GETHEADERS) { CBlockLocator locator; uint256 hashStop; vRecv >> locator >> hashStop; if (locator.vHave.size() > MAX_LOCATOR_SZ) { - LogPrint(BCLog::NET, "getheaders locator size %lld > %d, disconnect peer=%d\n", locator.vHave.size(), MAX_LOCATOR_SZ, pfrom->GetId()); - pfrom->fDisconnect = true; - return true; + LogPrint(BCLog::NET, "getheaders locator size %lld > %d, disconnect peer=%d\n", locator.vHave.size(), MAX_LOCATOR_SZ, pfrom.GetId()); + pfrom.fDisconnect = true; + return; } LOCK(cs_main); - if (::ChainstateActive().IsInitialBlockDownload() && !pfrom->HasPermission(PF_NOBAN)) { - LogPrint(BCLog::NET, "Ignoring getheaders from peer=%d because node is in initial block download\n", pfrom->GetId()); - return true; + if (::ChainstateActive().IsInitialBlockDownload() && !pfrom.HasPermission(PF_DOWNLOAD)) { + LogPrint(BCLog::NET, "Ignoring getheaders from peer=%d because node is in initial block download\n", pfrom.GetId()); + return; } - CNodeState *nodestate = State(pfrom->GetId()); + CNodeState *nodestate = State(pfrom.GetId()); const CBlockIndex* pindex = nullptr; if (locator.IsNull()) { // If locator is null, return the hashStop block pindex = LookupBlockIndex(hashStop); if (!pindex) { - return true; + return; } - if (!BlockRequestAllowed(pindex, chainparams.GetConsensus())) { - LogPrint(BCLog::NET, "%s: ignoring request from peer=%i for old block header that isn't in the main chain\n", __func__, pfrom->GetId()); - return true; + if (!BlockRequestAllowed(pindex, m_chainparams.GetConsensus())) { + LogPrint(BCLog::NET, "%s: ignoring request from peer=%i for old block header that isn't in the main chain\n", __func__, pfrom.GetId()); + return; } } else @@ -2447,7 +2873,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // we must use CBlocks, as CBlockHeaders won't include the 0x00 nTx count at the end std::vector<CBlock> vHeaders; int nLimit = MAX_HEADERS_RESULTS; - LogPrint(BCLog::NET, "getheaders %d to %s from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), pfrom->GetId()); + LogPrint(BCLog::NET, "getheaders %d to %s from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), pfrom.GetId()); for (; pindex; pindex = ::ChainActive().Next(pindex)) { vHeaders.push_back(pindex->GetBlockHeader()); @@ -2467,81 +2893,131 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // will re-announce the new block via headers (or compact blocks again) // in the SendMessages logic. nodestate->pindexBestHeaderSent = pindex ? pindex : ::ChainActive().Tip(); - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::HEADERS, vHeaders)); - return true; + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::HEADERS, vHeaders)); + return; } - if (strCommand == NetMsgType::TX) { + if (msg_type == NetMsgType::TX) { // Stop processing the transaction early if - // We are in blocks only mode and peer is either not whitelisted or whitelistrelay is off - // or if this peer is supposed to be a block-relay-only peer - if ((!g_relay_txes && !pfrom->HasPermission(PF_RELAY)) || (pfrom->m_tx_relay == nullptr)) + // 1) We are in blocks only mode and peer has no relay permission + // 2) This peer is a block-relay-only peer + if ((!g_relay_txes && !pfrom.HasPermission(PF_RELAY)) || (pfrom.m_tx_relay == nullptr)) { - LogPrint(BCLog::NET, "transaction sent in violation of protocol peer=%d\n", pfrom->GetId()); - pfrom->fDisconnect = true; - return true; + LogPrint(BCLog::NET, "transaction sent in violation of protocol peer=%d\n", pfrom.GetId()); + pfrom.fDisconnect = true; + return; } CTransactionRef ptx; vRecv >> ptx; const CTransaction& tx = *ptx; - CInv inv(MSG_TX, tx.GetHash()); - pfrom->AddInventoryKnown(inv); + const uint256& txid = ptx->GetHash(); + const uint256& wtxid = ptx->GetWitnessHash(); LOCK2(cs_main, g_cs_orphans); + CNodeState* nodestate = State(pfrom.GetId()); + + const uint256& hash = nodestate->m_wtxid_relay ? wtxid : txid; + pfrom.AddKnownTx(hash); + if (nodestate->m_wtxid_relay && txid != wtxid) { + // Insert txid into filterInventoryKnown, even for + // wtxidrelay peers. This prevents re-adding of + // unconfirmed parents to the recently_announced + // filter, when a child tx is requested. See + // ProcessGetData(). + pfrom.AddKnownTx(txid); + } + TxValidationState state; - CNodeState* nodestate = State(pfrom->GetId()); - nodestate->m_tx_download.m_tx_announced.erase(inv.hash); - nodestate->m_tx_download.m_tx_in_flight.erase(inv.hash); - EraseTxRequest(inv.hash); + m_txrequest.ReceivedResponse(pfrom.GetId(), txid); + if (tx.HasWitness()) m_txrequest.ReceivedResponse(pfrom.GetId(), wtxid); std::list<CTransactionRef> lRemovedTxn; - if (!AlreadyHave(inv) && - AcceptToMemoryPool(mempool, state, ptx, &lRemovedTxn, false /* bypass_limits */, 0 /* nAbsurdFee */)) { - mempool.check(&::ChainstateActive().CoinsTip()); - RelayTransaction(tx.GetHash(), *connman); + // We do the AlreadyHaveTx() check using wtxid, rather than txid - in the + // absence of witness malleation, this is strictly better, because the + // recent rejects filter may contain the wtxid but rarely contains + // the txid of a segwit transaction that has been rejected. + // In the presence of witness malleation, it's possible that by only + // doing the check with wtxid, we could overlook a transaction which + // was confirmed with a different witness, or exists in our mempool + // with a different witness, but this has limited downside: + // mempool validation does its own lookup of whether we have the txid + // already; and an adversary can already relay us old transactions + // (older than our recency filter) if trying to DoS us, without any need + // for witness malleation. + if (!AlreadyHaveTx(GenTxid(/* is_wtxid=*/true, wtxid), m_mempool) && + AcceptToMemoryPool(m_mempool, state, ptx, &lRemovedTxn, false /* bypass_limits */)) { + m_mempool.check(&::ChainstateActive().CoinsTip()); + // As this version of the transaction was acceptable, we can forget about any + // requests for it. + m_txrequest.ForgetTxHash(tx.GetHash()); + m_txrequest.ForgetTxHash(tx.GetWitnessHash()); + RelayTransaction(tx.GetHash(), tx.GetWitnessHash(), m_connman); for (unsigned int i = 0; i < tx.vout.size(); i++) { - auto it_by_prev = mapOrphanTransactionsByPrev.find(COutPoint(inv.hash, i)); + auto it_by_prev = mapOrphanTransactionsByPrev.find(COutPoint(txid, i)); if (it_by_prev != mapOrphanTransactionsByPrev.end()) { for (const auto& elem : it_by_prev->second) { - pfrom->orphan_work_set.insert(elem->first); + pfrom.orphan_work_set.insert(elem->first); } } } - pfrom->nLastTXTime = GetTime(); + pfrom.nLastTXTime = GetTime(); LogPrint(BCLog::MEMPOOL, "AcceptToMemoryPool: peer=%d: accepted %s (poolsz %u txn, %u kB)\n", - pfrom->GetId(), + pfrom.GetId(), tx.GetHash().ToString(), - mempool.size(), mempool.DynamicMemoryUsage() / 1000); + m_mempool.size(), m_mempool.DynamicMemoryUsage() / 1000); + + for (const CTransactionRef& removedTx : lRemovedTxn) { + AddToCompactExtraTransactions(removedTx); + } // Recursively process any orphan transactions that depended on this one - ProcessOrphanTx(connman, pfrom->orphan_work_set, lRemovedTxn); + ProcessOrphanTx(pfrom.orphan_work_set); } else if (state.GetResult() == TxValidationResult::TX_MISSING_INPUTS) { bool fRejectedParents = false; // It may be the case that the orphans parents have all been rejected + + // Deduplicate parent txids, so that we don't have to loop over + // the same parent txid more than once down below. + std::vector<uint256> unique_parents; + unique_parents.reserve(tx.vin.size()); for (const CTxIn& txin : tx.vin) { - if (recentRejects->contains(txin.prevout.hash)) { + // We start with all parents, and then remove duplicates below. + unique_parents.push_back(txin.prevout.hash); + } + std::sort(unique_parents.begin(), unique_parents.end()); + unique_parents.erase(std::unique(unique_parents.begin(), unique_parents.end()), unique_parents.end()); + for (const uint256& parent_txid : unique_parents) { + if (recentRejects->contains(parent_txid)) { fRejectedParents = true; break; } } if (!fRejectedParents) { - uint32_t nFetchFlags = GetFetchFlags(pfrom); const auto current_time = GetTime<std::chrono::microseconds>(); - for (const CTxIn& txin : tx.vin) { - CInv _inv(MSG_TX | nFetchFlags, txin.prevout.hash); - pfrom->AddInventoryKnown(_inv); - if (!AlreadyHave(_inv)) RequestTx(State(pfrom->GetId()), _inv.hash, current_time); + for (const uint256& parent_txid : unique_parents) { + // Here, we only have the txid (and not wtxid) of the + // inputs, so we only request in txid mode, even for + // wtxidrelay peers. + // Eventually we should replace this with an improved + // protocol for getting all unconfirmed parents. + const GenTxid gtxid{/* is_wtxid=*/false, parent_txid}; + pfrom.AddKnownTx(parent_txid); + if (!AlreadyHaveTx(gtxid, m_mempool)) AddTxAnnouncement(pfrom, gtxid, current_time); } - AddOrphanTx(ptx, pfrom->GetId()); + AddOrphanTx(ptx, pfrom.GetId()); + + // Once added to the orphan pool, a tx is considered AlreadyHave, and we shouldn't request it anymore. + m_txrequest.ForgetTxHash(tx.GetHash()); + m_txrequest.ForgetTxHash(tx.GetWitnessHash()); // DoS prevention: do not allow mapOrphanTransactions to grow unbounded (see CVE-2012-3789) unsigned int nMaxOrphanTx = (unsigned int)std::max((int64_t)0, gArgs.GetArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS)); @@ -2553,42 +3029,64 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr LogPrint(BCLog::MEMPOOL, "not keeping orphan with rejected parents %s\n",tx.GetHash().ToString()); // We will continue to reject this tx since it has rejected // parents so avoid re-requesting it from other peers. + // Here we add both the txid and the wtxid, as we know that + // regardless of what witness is provided, we will not accept + // this, so we don't need to allow for redownload of this txid + // from any of our non-wtxidrelay peers. recentRejects->insert(tx.GetHash()); + recentRejects->insert(tx.GetWitnessHash()); + m_txrequest.ForgetTxHash(tx.GetHash()); + m_txrequest.ForgetTxHash(tx.GetWitnessHash()); } } else { - if (!tx.HasWitness() && state.GetResult() != TxValidationResult::TX_WITNESS_MUTATED) { - // Do not use rejection cache for witness transactions or - // witness-stripped transactions, as they can have been malleated. - // See https://github.com/bitcoin/bitcoin/issues/8279 for details. + if (state.GetResult() != TxValidationResult::TX_WITNESS_STRIPPED) { + // We can add the wtxid of this transaction to our reject filter. + // Do not add txids of witness transactions or witness-stripped + // transactions to the filter, as they can have been malleated; + // adding such txids to the reject filter would potentially + // interfere with relay of valid transactions from peers that + // do not support wtxid-based relay. See + // https://github.com/bitcoin/bitcoin/issues/8279 for details. + // We can remove this restriction (and always add wtxids to + // the filter even for witness stripped transactions) once + // wtxid-based relay is broadly deployed. + // See also comments in https://github.com/bitcoin/bitcoin/pull/18044#discussion_r443419034 + // for concerns around weakening security of unupgraded nodes + // if we start doing this too early. assert(recentRejects); - recentRejects->insert(tx.GetHash()); + recentRejects->insert(tx.GetWitnessHash()); + m_txrequest.ForgetTxHash(tx.GetWitnessHash()); + // If the transaction failed for TX_INPUTS_NOT_STANDARD, + // then we know that the witness was irrelevant to the policy + // failure, since this check depends only on the txid + // (the scriptPubKey being spent is covered by the txid). + // Add the txid to the reject filter to prevent repeated + // processing of this transaction in the event that child + // transactions are later received (resulting in + // parent-fetching by txid via the orphan-handling logic). + if (state.GetResult() == TxValidationResult::TX_INPUTS_NOT_STANDARD && tx.GetWitnessHash() != tx.GetHash()) { + recentRejects->insert(tx.GetHash()); + m_txrequest.ForgetTxHash(tx.GetHash()); + } if (RecursiveDynamicUsage(*ptx) < 100000) { AddToCompactExtraTransactions(ptx); } - } else if (tx.HasWitness() && RecursiveDynamicUsage(*ptx) < 100000) { - AddToCompactExtraTransactions(ptx); } - if (pfrom->HasPermission(PF_FORCERELAY)) { - // Always relay transactions received from whitelisted peers, even - // if they were already in the mempool or rejected from it due - // to policy, allowing the node to function as a gateway for + if (pfrom.HasPermission(PF_FORCERELAY)) { + // Always relay transactions received from peers with forcerelay permission, even + // if they were already in the mempool, + // allowing the node to function as a gateway for // nodes hidden behind it. - // - // Never relay transactions that might result in being - // disconnected (or banned). - if (state.IsInvalid() && TxRelayMayResultInDisconnect(state)) { - LogPrintf("Not relaying invalid transaction %s from whitelisted peer=%d (%s)\n", tx.GetHash().ToString(), pfrom->GetId(), FormatStateMessage(state)); + if (!m_mempool.exists(tx.GetHash())) { + LogPrintf("Not relaying non-mempool transaction %s from forcerelay peer=%d\n", tx.GetHash().ToString(), pfrom.GetId()); } else { - LogPrintf("Force relaying tx %s from whitelisted peer=%d\n", tx.GetHash().ToString(), pfrom->GetId()); - RelayTransaction(tx.GetHash(), *connman); + LogPrintf("Force relaying tx %s from peer=%d\n", tx.GetHash().ToString(), pfrom.GetId()); + RelayTransaction(tx.GetHash(), tx.GetWitnessHash(), m_connman); } } } - for (const CTransactionRef& removedTx : lRemovedTxn) - AddToCompactExtraTransactions(removedTx); - // If a tx has been detected by recentRejects, we will have reached // this point and the tx will have been ignored. Because we haven't run // the tx through AcceptToMemoryPool, we won't have computed a DoS @@ -2606,22 +3104,21 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // peer simply for relaying a tx that our recentRejects has caught, // regardless of false positives. - if (state.IsInvalid()) - { + if (state.IsInvalid()) { LogPrint(BCLog::MEMPOOLREJ, "%s from peer=%d was not accepted: %s\n", tx.GetHash().ToString(), - pfrom->GetId(), - FormatStateMessage(state)); - MaybePunishNodeForTx(pfrom->GetId(), state); + pfrom.GetId(), + state.ToString()); + MaybePunishNodeForTx(pfrom.GetId(), state); } - return true; + return; } - if (strCommand == NetMsgType::CMPCTBLOCK) + if (msg_type == NetMsgType::CMPCTBLOCK) { // Ignore cmpctblock received while importing if (fImporting || fReindex) { - LogPrint(BCLog::NET, "Unexpected cmpctblock message received from peer %d\n", pfrom->GetId()); - return true; + LogPrint(BCLog::NET, "Unexpected cmpctblock message received from peer %d\n", pfrom.GetId()); + return; } CBlockHeaderAndShortTxIDs cmpctblock; @@ -2635,8 +3132,8 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr if (!LookupBlockIndex(cmpctblock.header.hashPrevBlock)) { // Doesn't connect (or is genesis), instead of DoSing in AcceptBlockHeader, request deeper headers if (!::ChainstateActive().IsInitialBlockDownload()) - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexBestHeader), uint256())); - return true; + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexBestHeader), uint256())); + return; } if (!LookupBlockIndex(cmpctblock.header.GetHash())) { @@ -2646,10 +3143,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr const CBlockIndex *pindex = nullptr; BlockValidationState state; - if (!ProcessNewBlockHeaders({cmpctblock.header}, state, chainparams, &pindex)) { + if (!m_chainman.ProcessNewBlockHeaders({cmpctblock.header}, state, m_chainparams, &pindex)) { if (state.IsInvalid()) { - MaybePunishNodeForBlock(pfrom->GetId(), state, /*via_compact_block*/ true, "invalid header via cmpctblock"); - return true; + MaybePunishNodeForBlock(pfrom.GetId(), state, /*via_compact_block*/ true, "invalid header via cmpctblock"); + return; } } @@ -2673,9 +3170,9 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr LOCK2(cs_main, g_cs_orphans); // If AcceptBlockHeader returned true, it set pindex assert(pindex); - UpdateBlockAvailability(pfrom->GetId(), pindex->GetBlockHash()); + UpdateBlockAvailability(pfrom.GetId(), pindex->GetBlockHash()); - CNodeState *nodestate = State(pfrom->GetId()); + CNodeState *nodestate = State(pfrom.GetId()); // If this was a new header with more work than our tip, update the // peer's last block announcement time @@ -2687,7 +3184,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr bool fAlreadyInFlight = blockInFlightIt != mapBlocksInFlight.end(); if (pindex->nStatus & BLOCK_HAVE_DATA) // Nothing to do here - return true; + return; if (pindex->nChainWork <= ::ChainActive().Tip()->nChainWork || // We know something better pindex->nTx != 0) { // We had this block at some point, but pruned it @@ -2696,49 +3193,49 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // so we just grab the block via normal getdata std::vector<CInv> vInv(1); vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(pfrom), cmpctblock.header.GetHash()); - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv)); + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv)); } - return true; + return; } // If we're not close to tip yet, give up and let parallel block fetch work its magic - if (!fAlreadyInFlight && !CanDirectFetch(chainparams.GetConsensus())) - return true; + if (!fAlreadyInFlight && !CanDirectFetch(m_chainparams.GetConsensus())) + return; - if (IsWitnessEnabled(pindex->pprev, chainparams.GetConsensus()) && !nodestate->fSupportsDesiredCmpctVersion) { + if (IsWitnessEnabled(pindex->pprev, m_chainparams.GetConsensus()) && !nodestate->fSupportsDesiredCmpctVersion) { // Don't bother trying to process compact blocks from v1 peers // after segwit activates. - return true; + return; } // We want to be a bit conservative just to be extra careful about DoS // possibilities in compact block processing... if (pindex->nHeight <= ::ChainActive().Height() + 2) { if ((!fAlreadyInFlight && nodestate->nBlocksInFlight < MAX_BLOCKS_IN_TRANSIT_PER_PEER) || - (fAlreadyInFlight && blockInFlightIt->second.first == pfrom->GetId())) { + (fAlreadyInFlight && blockInFlightIt->second.first == pfrom.GetId())) { std::list<QueuedBlock>::iterator* queuedBlockIt = nullptr; - if (!MarkBlockAsInFlight(pfrom->GetId(), pindex->GetBlockHash(), pindex, &queuedBlockIt)) { + if (!MarkBlockAsInFlight(m_mempool, pfrom.GetId(), pindex->GetBlockHash(), pindex, &queuedBlockIt)) { if (!(*queuedBlockIt)->partialBlock) - (*queuedBlockIt)->partialBlock.reset(new PartiallyDownloadedBlock(&mempool)); + (*queuedBlockIt)->partialBlock.reset(new PartiallyDownloadedBlock(&m_mempool)); else { // The block was already in flight using compact blocks from the same peer LogPrint(BCLog::NET, "Peer sent us compact block we were already syncing!\n"); - return true; + return; } } PartiallyDownloadedBlock& partialBlock = *(*queuedBlockIt)->partialBlock; ReadStatus status = partialBlock.InitData(cmpctblock, vExtraTxnForCompact); if (status == READ_STATUS_INVALID) { - MarkBlockAsReceived(pindex->GetBlockHash()); // Reset in-flight state in case of whitelist - Misbehaving(pfrom->GetId(), 100, strprintf("Peer %d sent us invalid compact block\n", pfrom->GetId())); - return true; + MarkBlockAsReceived(pindex->GetBlockHash()); // Reset in-flight state in case Misbehaving does not result in a disconnect + Misbehaving(pfrom.GetId(), 100, "invalid compact block"); + return; } else if (status == READ_STATUS_FAILED) { // Duplicate txindexes, the block is now in-flight, so just request it std::vector<CInv> vInv(1); vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(pfrom), cmpctblock.header.GetHash()); - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv)); - return true; + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv)); + return; } BlockTransactionsRequest req; @@ -2754,7 +3251,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr fProcessBLOCKTXN = true; } else { req.blockhash = pindex->GetBlockHash(); - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETBLOCKTXN, req)); + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETBLOCKTXN, req)); } } else { // This block is either already in flight from a different @@ -2762,11 +3259,11 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // download from. // Optimistically try to reconstruct anyway since we might be // able to without any round trips. - PartiallyDownloadedBlock tempBlock(&mempool); + PartiallyDownloadedBlock tempBlock(&m_mempool); ReadStatus status = tempBlock.InitData(cmpctblock, vExtraTxnForCompact); if (status != READ_STATUS_OK) { // TODO: don't ignore failures - return true; + return; } std::vector<CTransactionRef> dummy; status = tempBlock.FillBlock(*pblock, dummy); @@ -2780,8 +3277,8 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // mempool will probably be useless - request the block normally std::vector<CInv> vInv(1); vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(pfrom), cmpctblock.header.GetHash()); - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv)); - return true; + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETDATA, vInv)); + return; } else { // If this was an announce-cmpctblock, we want the same treatment as a header message fRevertToHeaderProcessing = true; @@ -2789,16 +3286,17 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr } } // cs_main - if (fProcessBLOCKTXN) - return ProcessMessage(pfrom, NetMsgType::BLOCKTXN, blockTxnMsg, nTimeReceived, chainparams, connman, banman, interruptMsgProc); + if (fProcessBLOCKTXN) { + return ProcessMessage(pfrom, NetMsgType::BLOCKTXN, blockTxnMsg, time_received, interruptMsgProc); + } if (fRevertToHeaderProcessing) { // Headers received from HB compact block peers are permitted to be // relayed before full validation (see BIP 152), so we don't want to disconnect // the peer if the header turns out to be for an invalid block. // Note that if a peer tries to build on an invalid chain, that - // will be detected and the peer will be banned. - return ProcessHeadersMessage(pfrom, connman, {cmpctblock.header}, chainparams, /*via_compact_block=*/true); + // will be detected and the peer will be disconnected/discouraged. + return ProcessHeadersMessage(pfrom, {cmpctblock.header}, /*via_compact_block=*/true); } if (fBlockReconstructed) { @@ -2806,7 +3304,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // block that is in flight from some other peer. { LOCK(cs_main); - mapBlockSource.emplace(pblock->GetHash(), std::make_pair(pfrom->GetId(), false)); + mapBlockSource.emplace(pblock->GetHash(), std::make_pair(pfrom.GetId(), false)); } bool fNewBlock = false; // Setting fForceProcessing to true means that we bypass some of @@ -2818,9 +3316,9 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // we have a chain with at least nMinimumChainWork), and we ignore // compact blocks with less work than our tip, it is safe to treat // reconstructed compact blocks as having been requested. - ProcessNewBlock(chainparams, pblock, /*fForceProcessing=*/true, &fNewBlock); + m_chainman.ProcessNewBlock(m_chainparams, pblock, /*fForceProcessing=*/true, &fNewBlock); if (fNewBlock) { - pfrom->nLastBlockTime = GetTime(); + pfrom.nLastBlockTime = GetTime(); } else { LOCK(cs_main); mapBlockSource.erase(pblock->GetHash()); @@ -2834,15 +3332,15 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr MarkBlockAsReceived(pblock->GetHash()); } } - return true; + return; } - if (strCommand == NetMsgType::BLOCKTXN) + if (msg_type == NetMsgType::BLOCKTXN) { // Ignore blocktxn received while importing if (fImporting || fReindex) { - LogPrint(BCLog::NET, "Unexpected blocktxn message received from peer %d\n", pfrom->GetId()); - return true; + LogPrint(BCLog::NET, "Unexpected blocktxn message received from peer %d\n", pfrom.GetId()); + return; } BlockTransactions resp; @@ -2855,22 +3353,22 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr std::map<uint256, std::pair<NodeId, std::list<QueuedBlock>::iterator> >::iterator it = mapBlocksInFlight.find(resp.blockhash); if (it == mapBlocksInFlight.end() || !it->second.second->partialBlock || - it->second.first != pfrom->GetId()) { - LogPrint(BCLog::NET, "Peer %d sent us block transactions for block we weren't expecting\n", pfrom->GetId()); - return true; + it->second.first != pfrom.GetId()) { + LogPrint(BCLog::NET, "Peer %d sent us block transactions for block we weren't expecting\n", pfrom.GetId()); + return; } PartiallyDownloadedBlock& partialBlock = *it->second.second->partialBlock; ReadStatus status = partialBlock.FillBlock(*pblock, resp.txn); if (status == READ_STATUS_INVALID) { - MarkBlockAsReceived(resp.blockhash); // Reset in-flight state in case of whitelist - Misbehaving(pfrom->GetId(), 100, strprintf("Peer %d sent us invalid compact block/non-matching block transactions\n", pfrom->GetId())); - return true; + MarkBlockAsReceived(resp.blockhash); // Reset in-flight state in case Misbehaving does not result in a disconnect + Misbehaving(pfrom.GetId(), 100, "invalid compact block/non-matching block transactions"); + return; } else if (status == READ_STATUS_FAILED) { // Might have collided, fall back to getdata now :( std::vector<CInv> invs; invs.push_back(CInv(MSG_BLOCK | GetFetchFlags(pfrom), resp.blockhash)); - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::GETDATA, invs)); + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::GETDATA, invs)); } else { // Block is either okay, or possibly we received // READ_STATUS_CHECKBLOCK_FAILED. @@ -2883,7 +3381,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // 3. the block is otherwise invalid (eg invalid coinbase, // block is too big, too many legacy sigops, etc). // So if CheckBlock failed, #3 is the only possibility. - // Under BIP 152, we don't DoS-ban unless proof of work is + // Under BIP 152, we don't discourage the peer unless proof of work is // invalid (we don't require all the stateless checks to have // been run). This is handled below, so just treat this as // though the block was successfully read, and rely on the @@ -2897,7 +3395,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // BIP 152 permits peers to relay compact blocks after validating // the header only; we should not punish peers if the block turns // out to be invalid. - mapBlockSource.emplace(resp.blockhash, std::make_pair(pfrom->GetId(), false)); + mapBlockSource.emplace(resp.blockhash, std::make_pair(pfrom.GetId(), false)); } } // Don't hold cs_main when we call into ProcessNewBlock if (fBlockRead) { @@ -2908,23 +3406,23 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // disk-space attacks), but this should be safe due to the // protections in the compact block handler -- see related comment // in compact block optimistic reconstruction handling. - ProcessNewBlock(chainparams, pblock, /*fForceProcessing=*/true, &fNewBlock); + m_chainman.ProcessNewBlock(m_chainparams, pblock, /*fForceProcessing=*/true, &fNewBlock); if (fNewBlock) { - pfrom->nLastBlockTime = GetTime(); + pfrom.nLastBlockTime = GetTime(); } else { LOCK(cs_main); mapBlockSource.erase(pblock->GetHash()); } } - return true; + return; } - if (strCommand == NetMsgType::HEADERS) + if (msg_type == NetMsgType::HEADERS) { // Ignore headers received while importing if (fImporting || fReindex) { - LogPrint(BCLog::NET, "Unexpected headers message received from peer %d\n", pfrom->GetId()); - return true; + LogPrint(BCLog::NET, "Unexpected headers message received from peer %d\n", pfrom.GetId()); + return; } std::vector<CBlockHeader> headers; @@ -2932,9 +3430,8 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // Bypass the normal CBlock deserialization, as we don't want to risk deserializing 2000 full blocks. unsigned int nCount = ReadCompactSize(vRecv); if (nCount > MAX_HEADERS_RESULTS) { - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 20, strprintf("headers message size = %u", nCount)); - return false; + Misbehaving(pfrom.GetId(), 20, strprintf("headers message size = %u", nCount)); + return; } headers.resize(nCount); for (unsigned int n = 0; n < nCount; n++) { @@ -2942,21 +3439,21 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr ReadCompactSize(vRecv); // ignore tx count; assume it is 0. } - return ProcessHeadersMessage(pfrom, connman, headers, chainparams, /*via_compact_block=*/false); + return ProcessHeadersMessage(pfrom, headers, /*via_compact_block=*/false); } - if (strCommand == NetMsgType::BLOCK) + if (msg_type == NetMsgType::BLOCK) { // Ignore block received while importing if (fImporting || fReindex) { - LogPrint(BCLog::NET, "Unexpected block message received from peer %d\n", pfrom->GetId()); - return true; + LogPrint(BCLog::NET, "Unexpected block message received from peer %d\n", pfrom.GetId()); + return; } std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>(); vRecv >> *pblock; - LogPrint(BCLog::NET, "received block %s peer=%d\n", pblock->GetHash().ToString(), pfrom->GetId()); + LogPrint(BCLog::NET, "received block %s peer=%d\n", pblock->GetHash().ToString(), pfrom.GetId()); bool forceProcessing = false; const uint256 hash(pblock->GetHash()); @@ -2968,84 +3465,82 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // mapBlockSource is only used for punishing peers and setting // which peers send us compact blocks, so the race between here and // cs_main in ProcessNewBlock is fine. - mapBlockSource.emplace(hash, std::make_pair(pfrom->GetId(), true)); + mapBlockSource.emplace(hash, std::make_pair(pfrom.GetId(), true)); } bool fNewBlock = false; - ProcessNewBlock(chainparams, pblock, forceProcessing, &fNewBlock); + m_chainman.ProcessNewBlock(m_chainparams, pblock, forceProcessing, &fNewBlock); if (fNewBlock) { - pfrom->nLastBlockTime = GetTime(); + pfrom.nLastBlockTime = GetTime(); } else { LOCK(cs_main); mapBlockSource.erase(pblock->GetHash()); } - return true; + return; } - if (strCommand == NetMsgType::GETADDR) { + if (msg_type == NetMsgType::GETADDR) { // This asymmetric behavior for inbound and outbound connections was introduced // to prevent a fingerprinting attack: an attacker can send specific fake addresses // to users' AddrMan and later request them by sending getaddr messages. // Making nodes which are behind NAT and can only make outgoing connections ignore // the getaddr message mitigates the attack. - if (!pfrom->fInbound) { - LogPrint(BCLog::NET, "Ignoring \"getaddr\" from outbound connection. peer=%d\n", pfrom->GetId()); - return true; - } - if (!pfrom->IsAddrRelayPeer()) { - LogPrint(BCLog::NET, "Ignoring \"getaddr\" from block-relay-only connection. peer=%d\n", pfrom->GetId()); - return true; + if (!pfrom.IsInboundConn()) { + LogPrint(BCLog::NET, "Ignoring \"getaddr\" from %s connection. peer=%d\n", pfrom.ConnectionTypeAsString(), pfrom.GetId()); + return; } // Only send one GetAddr response per connection to reduce resource waste // and discourage addr stamping of INV announcements. - if (pfrom->fSentAddr) { - LogPrint(BCLog::NET, "Ignoring repeated \"getaddr\". peer=%d\n", pfrom->GetId()); - return true; + if (pfrom.fSentAddr) { + LogPrint(BCLog::NET, "Ignoring repeated \"getaddr\". peer=%d\n", pfrom.GetId()); + return; } - pfrom->fSentAddr = true; + pfrom.fSentAddr = true; - pfrom->vAddrToSend.clear(); - std::vector<CAddress> vAddr = connman->GetAddresses(); + pfrom.vAddrToSend.clear(); + std::vector<CAddress> vAddr; + if (pfrom.HasPermission(PF_ADDR)) { + vAddr = m_connman.GetAddresses(MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND); + } else { + vAddr = m_connman.GetAddresses(pfrom, MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND); + } FastRandomContext insecure_rand; for (const CAddress &addr : vAddr) { - if (!banman->IsBanned(addr)) { - pfrom->PushAddress(addr, insecure_rand); - } + pfrom.PushAddress(addr, insecure_rand); } - return true; + return; } - if (strCommand == NetMsgType::MEMPOOL) { - if (!(pfrom->GetLocalServices() & NODE_BLOOM) && !pfrom->HasPermission(PF_MEMPOOL)) + if (msg_type == NetMsgType::MEMPOOL) { + if (!(pfrom.GetLocalServices() & NODE_BLOOM) && !pfrom.HasPermission(PF_MEMPOOL)) { - if (!pfrom->HasPermission(PF_NOBAN)) + if (!pfrom.HasPermission(PF_NOBAN)) { - LogPrint(BCLog::NET, "mempool request with bloom filters disabled, disconnect peer=%d\n", pfrom->GetId()); - pfrom->fDisconnect = true; + LogPrint(BCLog::NET, "mempool request with bloom filters disabled, disconnect peer=%d\n", pfrom.GetId()); + pfrom.fDisconnect = true; } - return true; + return; } - if (connman->OutboundTargetReached(false) && !pfrom->HasPermission(PF_MEMPOOL)) + if (m_connman.OutboundTargetReached(false) && !pfrom.HasPermission(PF_MEMPOOL)) { - if (!pfrom->HasPermission(PF_NOBAN)) + if (!pfrom.HasPermission(PF_NOBAN)) { - LogPrint(BCLog::NET, "mempool request with bandwidth limit reached, disconnect peer=%d\n", pfrom->GetId()); - pfrom->fDisconnect = true; + LogPrint(BCLog::NET, "mempool request with bandwidth limit reached, disconnect peer=%d\n", pfrom.GetId()); + pfrom.fDisconnect = true; } - return true; + return; } - if (pfrom->m_tx_relay != nullptr) { - LOCK(pfrom->m_tx_relay->cs_tx_inventory); - pfrom->m_tx_relay->fSendMempool = true; + if (pfrom.m_tx_relay != nullptr) { + LOCK(pfrom.m_tx_relay->cs_tx_inventory); + pfrom.m_tx_relay->fSendMempool = true; } - return true; + return; } - if (strCommand == NetMsgType::PING) { - if (pfrom->nVersion > BIP0031_VERSION) - { + if (msg_type == NetMsgType::PING) { + if (pfrom.GetCommonVersion() > BIP0031_VERSION) { uint64_t nonce = 0; vRecv >> nonce; // Echo the message back with the nonce. This allows for two useful features: @@ -3059,13 +3554,13 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr // it, if the remote node sends a ping once per second and this node takes 5 // seconds to respond to each, the 5th ping the remote sends would appear to // return very quickly. - connman->PushMessage(pfrom, msgMaker.Make(NetMsgType::PONG, nonce)); + m_connman.PushMessage(&pfrom, msgMaker.Make(NetMsgType::PONG, nonce)); } - return true; + return; } - if (strCommand == NetMsgType::PONG) { - int64_t pingUsecEnd = nTimeReceived; + if (msg_type == NetMsgType::PONG) { + const auto ping_end = time_received; uint64_t nonce = 0; size_t nAvail = vRecv.in_avail(); bool bPingFinished = false; @@ -3075,15 +3570,15 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr vRecv >> nonce; // Only process pong message if there is an outstanding ping (old ping without nonce should never pong) - if (pfrom->nPingNonceSent != 0) { - if (nonce == pfrom->nPingNonceSent) { + if (pfrom.nPingNonceSent != 0) { + if (nonce == pfrom.nPingNonceSent) { // Matching pong received, this ping is no longer outstanding bPingFinished = true; - int64_t pingUsecTime = pingUsecEnd - pfrom->nPingUsecStart; - if (pingUsecTime > 0) { + const auto ping_time = ping_end - pfrom.m_ping_start.load(); + if (ping_time.count() >= 0) { // Successful ping time measurement, replace previous - pfrom->nPingUsecTime = pingUsecTime; - pfrom->nMinPingUsecTime = std::min(pfrom->nMinPingUsecTime.load(), pingUsecTime); + pfrom.nPingUsecTime = count_microseconds(ping_time); + pfrom.nMinPingUsecTime = std::min(pfrom.nMinPingUsecTime.load(), count_microseconds(ping_time)); } else { // This should never happen sProblem = "Timing mishap"; @@ -3108,39 +3603,45 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr if (!(sProblem.empty())) { LogPrint(BCLog::NET, "pong peer=%d: %s, %x expected, %x received, %u bytes\n", - pfrom->GetId(), + pfrom.GetId(), sProblem, - pfrom->nPingNonceSent, + pfrom.nPingNonceSent, nonce, nAvail); } if (bPingFinished) { - pfrom->nPingNonceSent = 0; + pfrom.nPingNonceSent = 0; } - return true; + return; } - if (strCommand == NetMsgType::FILTERLOAD) { + if (msg_type == NetMsgType::FILTERLOAD) { + if (!(pfrom.GetLocalServices() & NODE_BLOOM)) { + pfrom.fDisconnect = true; + return; + } CBloomFilter filter; vRecv >> filter; if (!filter.IsWithinSizeConstraints()) { // There is no excuse for sending a too-large filter - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 100); + Misbehaving(pfrom.GetId(), 100, "too-large bloom filter"); } - else if (pfrom->m_tx_relay != nullptr) + else if (pfrom.m_tx_relay != nullptr) { - LOCK(pfrom->m_tx_relay->cs_filter); - pfrom->m_tx_relay->pfilter.reset(new CBloomFilter(filter)); - pfrom->m_tx_relay->pfilter->UpdateEmptyFull(); - pfrom->m_tx_relay->fRelayTxes = true; + LOCK(pfrom.m_tx_relay->cs_filter); + pfrom.m_tx_relay->pfilter.reset(new CBloomFilter(filter)); + pfrom.m_tx_relay->fRelayTxes = true; } - return true; + return; } - if (strCommand == NetMsgType::FILTERADD) { + if (msg_type == NetMsgType::FILTERADD) { + if (!(pfrom.GetLocalServices() & NODE_BLOOM)) { + pfrom.fDisconnect = true; + return; + } std::vector<unsigned char> vData; vRecv >> vData; @@ -3149,126 +3650,135 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr bool bad = false; if (vData.size() > MAX_SCRIPT_ELEMENT_SIZE) { bad = true; - } else if (pfrom->m_tx_relay != nullptr) { - LOCK(pfrom->m_tx_relay->cs_filter); - if (pfrom->m_tx_relay->pfilter) { - pfrom->m_tx_relay->pfilter->insert(vData); + } else if (pfrom.m_tx_relay != nullptr) { + LOCK(pfrom.m_tx_relay->cs_filter); + if (pfrom.m_tx_relay->pfilter) { + pfrom.m_tx_relay->pfilter->insert(vData); } else { bad = true; } } if (bad) { - LOCK(cs_main); - Misbehaving(pfrom->GetId(), 100); + Misbehaving(pfrom.GetId(), 100, "bad filteradd message"); } - return true; + return; } - if (strCommand == NetMsgType::FILTERCLEAR) { - if (pfrom->m_tx_relay == nullptr) { - return true; + if (msg_type == NetMsgType::FILTERCLEAR) { + if (!(pfrom.GetLocalServices() & NODE_BLOOM)) { + pfrom.fDisconnect = true; + return; } - LOCK(pfrom->m_tx_relay->cs_filter); - if (pfrom->GetLocalServices() & NODE_BLOOM) { - pfrom->m_tx_relay->pfilter.reset(new CBloomFilter()); + if (pfrom.m_tx_relay == nullptr) { + return; } - pfrom->m_tx_relay->fRelayTxes = true; - return true; + LOCK(pfrom.m_tx_relay->cs_filter); + pfrom.m_tx_relay->pfilter = nullptr; + pfrom.m_tx_relay->fRelayTxes = true; + return; } - if (strCommand == NetMsgType::FEEFILTER) { + if (msg_type == NetMsgType::FEEFILTER) { CAmount newFeeFilter = 0; vRecv >> newFeeFilter; if (MoneyRange(newFeeFilter)) { - if (pfrom->m_tx_relay != nullptr) { - LOCK(pfrom->m_tx_relay->cs_feeFilter); - pfrom->m_tx_relay->minFeeFilter = newFeeFilter; + if (pfrom.m_tx_relay != nullptr) { + LOCK(pfrom.m_tx_relay->cs_feeFilter); + pfrom.m_tx_relay->minFeeFilter = newFeeFilter; } - LogPrint(BCLog::NET, "received: feefilter of %s from peer=%d\n", CFeeRate(newFeeFilter).ToString(), pfrom->GetId()); + LogPrint(BCLog::NET, "received: feefilter of %s from peer=%d\n", CFeeRate(newFeeFilter).ToString(), pfrom.GetId()); } - return true; + return; } - if (strCommand == NetMsgType::NOTFOUND) { - // Remove the NOTFOUND transactions from the peer - LOCK(cs_main); - CNodeState *state = State(pfrom->GetId()); + if (msg_type == NetMsgType::GETCFILTERS) { + ProcessGetCFilters(pfrom, vRecv, m_chainparams, m_connman); + return; + } + + if (msg_type == NetMsgType::GETCFHEADERS) { + ProcessGetCFHeaders(pfrom, vRecv, m_chainparams, m_connman); + return; + } + + if (msg_type == NetMsgType::GETCFCHECKPT) { + ProcessGetCFCheckPt(pfrom, vRecv, m_chainparams, m_connman); + return; + } + + if (msg_type == NetMsgType::NOTFOUND) { std::vector<CInv> vInv; vRecv >> vInv; - if (vInv.size() <= MAX_PEER_TX_IN_FLIGHT + MAX_BLOCKS_IN_TRANSIT_PER_PEER) { + if (vInv.size() <= MAX_PEER_TX_ANNOUNCEMENTS + MAX_BLOCKS_IN_TRANSIT_PER_PEER) { + LOCK(::cs_main); for (CInv &inv : vInv) { - if (inv.type == MSG_TX || inv.type == MSG_WITNESS_TX) { - // If we receive a NOTFOUND message for a txid we requested, erase - // it from our data structures for this peer. - auto in_flight_it = state->m_tx_download.m_tx_in_flight.find(inv.hash); - if (in_flight_it == state->m_tx_download.m_tx_in_flight.end()) { - // Skip any further work if this is a spurious NOTFOUND - // message. - continue; - } - state->m_tx_download.m_tx_in_flight.erase(in_flight_it); - state->m_tx_download.m_tx_announced.erase(inv.hash); + if (inv.IsGenTxMsg()) { + // If we receive a NOTFOUND message for a tx we requested, mark the announcement for it as + // completed in TxRequestTracker. + m_txrequest.ReceivedResponse(pfrom.GetId(), inv.hash); } } } - return true; + return; } // Ignore unknown commands for extensibility - LogPrint(BCLog::NET, "Unknown command \"%s\" from peer=%d\n", SanitizeString(strCommand), pfrom->GetId()); - return true; + LogPrint(BCLog::NET, "Unknown command \"%s\" from peer=%d\n", SanitizeString(msg_type), pfrom.GetId()); + return; } -bool PeerLogicValidation::CheckIfBanned(CNode* pnode) +bool PeerManager::MaybeDiscourageAndDisconnect(CNode& pnode) { - AssertLockHeld(cs_main); - CNodeState &state = *State(pnode->GetId()); - - if (state.fShouldBan) { - state.fShouldBan = false; - if (pnode->HasPermission(PF_NOBAN)) - LogPrintf("Warning: not punishing whitelisted peer %s!\n", pnode->addr.ToString()); - else if (pnode->m_manual_connection) - LogPrintf("Warning: not punishing manually-connected peer %s!\n", pnode->addr.ToString()); - else if (pnode->addr.IsLocal()) { - // Disconnect but don't ban _this_ local node - LogPrintf("Warning: disconnecting but not banning local peer %s!\n", pnode->addr.ToString()); - pnode->fDisconnect = true; - } else { - // Disconnect and ban all nodes sharing the address - if (m_banman) { - m_banman->Ban(pnode->addr, BanReasonNodeMisbehaving); - } - connman->DisconnectNode(pnode->addr); - } + const NodeId peer_id{pnode.GetId()}; + PeerRef peer = GetPeerRef(peer_id); + if (peer == nullptr) return false; + + { + LOCK(peer->m_misbehavior_mutex); + + // There's nothing to do if the m_should_discourage flag isn't set + if (!peer->m_should_discourage) return false; + + peer->m_should_discourage = false; + } // peer.m_misbehavior_mutex + + if (pnode.HasPermission(PF_NOBAN)) { + // We never disconnect or discourage peers for bad behavior if they have the NOBAN permission flag + LogPrintf("Warning: not punishing noban peer %d!\n", peer_id); + return false; + } + + if (pnode.IsManualConn()) { + // We never disconnect or discourage manual peers for bad behavior + LogPrintf("Warning: not punishing manually connected peer %d!\n", peer_id); + return false; + } + + if (pnode.addr.IsLocal()) { + // We disconnect local peers for bad behavior but don't discourage (since that would discourage + // all peers on the same local address) + LogPrintf("Warning: disconnecting but not discouraging local peer %d!\n", peer_id); + pnode.fDisconnect = true; return true; } - return false; + + // Normal case: Disconnect the peer and discourage all nodes sharing the address + LogPrintf("Disconnecting and discouraging peer %d!\n", peer_id); + if (m_banman) m_banman->Discourage(pnode.addr); + m_connman.DisconnectNode(pnode.addr); + return true; } -bool PeerLogicValidation::ProcessMessages(CNode* pfrom, std::atomic<bool>& interruptMsgProc) +bool PeerManager::ProcessMessages(CNode* pfrom, std::atomic<bool>& interruptMsgProc) { - const CChainParams& chainparams = Params(); - // - // Message format - // (4) message start - // (12) command - // (4) size - // (4) checksum - // (x) data - // bool fMoreWork = false; if (!pfrom->vRecvGetData.empty()) - ProcessGetData(pfrom, chainparams, connman, interruptMsgProc); + ProcessGetData(*pfrom, m_chainparams, m_connman, m_mempool, interruptMsgProc); if (!pfrom->orphan_work_set.empty()) { - std::list<CTransactionRef> removed_txn; LOCK2(cs_main, g_cs_orphans); - ProcessOrphanTx(connman, pfrom->orphan_work_set, removed_txn); - for (const CTransactionRef& removedTx : removed_txn) { - AddToCompactExtraTransactions(removedTx); - } + ProcessOrphanTx(pfrom->orphan_work_set); } if (pfrom->fDisconnect) @@ -3291,94 +3801,40 @@ bool PeerLogicValidation::ProcessMessages(CNode* pfrom, std::atomic<bool>& inter // Just take one message msgs.splice(msgs.begin(), pfrom->vProcessMsg, pfrom->vProcessMsg.begin()); pfrom->nProcessQueueSize -= msgs.front().m_raw_message_size; - pfrom->fPauseRecv = pfrom->nProcessQueueSize > connman->GetReceiveFloodSize(); + pfrom->fPauseRecv = pfrom->nProcessQueueSize > m_connman.GetReceiveFloodSize(); fMoreWork = !pfrom->vProcessMsg.empty(); } CNetMessage& msg(msgs.front()); - msg.SetVersion(pfrom->GetRecvVersion()); - // Check network magic - if (!msg.m_valid_netmagic) { - LogPrint(BCLog::NET, "PROCESSMESSAGE: INVALID MESSAGESTART %s peer=%d\n", SanitizeString(msg.m_command), pfrom->GetId()); - pfrom->fDisconnect = true; - return false; - } - - // Check header - if (!msg.m_valid_header) - { - LogPrint(BCLog::NET, "PROCESSMESSAGE: ERRORS IN HEADER %s peer=%d\n", SanitizeString(msg.m_command), pfrom->GetId()); - return fMoreWork; - } - const std::string& strCommand = msg.m_command; + msg.SetVersion(pfrom->GetCommonVersion()); + const std::string& msg_type = msg.m_command; // Message size unsigned int nMessageSize = msg.m_message_size; - // Checksum - CDataStream& vRecv = msg.m_recv; - if (!msg.m_valid_checksum) - { - LogPrint(BCLog::NET, "%s(%s, %u bytes): CHECKSUM ERROR peer=%d\n", __func__, - SanitizeString(strCommand), nMessageSize, pfrom->GetId()); - return fMoreWork; - } - - // Process message - bool fRet = false; - try - { - fRet = ProcessMessage(pfrom, strCommand, vRecv, msg.m_time, chainparams, connman, m_banman, interruptMsgProc); + try { + ProcessMessage(*pfrom, msg_type, msg.m_recv, msg.m_time, interruptMsgProc); if (interruptMsgProc) return false; if (!pfrom->vRecvGetData.empty()) fMoreWork = true; - } - catch (const std::ios_base::failure& e) - { - if (strstr(e.what(), "end of data")) { - // Allow exceptions from under-length message on vRecv - LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught, normally caused by a message being shorter than its stated length\n", __func__, SanitizeString(strCommand), nMessageSize, e.what()); - } else if (strstr(e.what(), "size too large")) { - // Allow exceptions from over-long size - LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what()); - } else if (strstr(e.what(), "non-canonical ReadCompactSize()")) { - // Allow exceptions from non-canonical encoding - LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what()); - } else if (strstr(e.what(), "Superfluous witness record")) { - // Allow exceptions from illegal witness encoding - LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what()); - } else if (strstr(e.what(), "Unknown transaction optional data")) { - // Allow exceptions from unknown witness encoding - LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' caught\n", __func__, SanitizeString(strCommand), nMessageSize, e.what()); - } else { - PrintExceptionContinue(&e, "ProcessMessages()"); - } - } - catch (const std::exception& e) { - PrintExceptionContinue(&e, "ProcessMessages()"); + } catch (const std::exception& e) { + LogPrint(BCLog::NET, "%s(%s, %u bytes): Exception '%s' (%s) caught\n", __func__, SanitizeString(msg_type), nMessageSize, e.what(), typeid(e).name()); } catch (...) { - PrintExceptionContinue(nullptr, "ProcessMessages()"); - } - - if (!fRet) { - LogPrint(BCLog::NET, "%s(%s, %u bytes) FAILED peer=%d\n", __func__, SanitizeString(strCommand), nMessageSize, pfrom->GetId()); + LogPrint(BCLog::NET, "%s(%s, %u bytes): Unknown exception caught\n", __func__, SanitizeString(msg_type), nMessageSize); } - LOCK(cs_main); - CheckIfBanned(pfrom); - return fMoreWork; } -void PeerLogicValidation::ConsiderEviction(CNode *pto, int64_t time_in_seconds) +void PeerManager::ConsiderEviction(CNode& pto, int64_t time_in_seconds) { AssertLockHeld(cs_main); - CNodeState &state = *State(pto->GetId()); - const CNetMsgMaker msgMaker(pto->GetSendVersion()); + CNodeState &state = *State(pto.GetId()); + const CNetMsgMaker msgMaker(pto.GetCommonVersion()); - if (!state.m_chain_sync.m_protect && IsOutboundDisconnectionCandidate(pto) && state.fSyncStarted) { + if (!state.m_chain_sync.m_protect && pto.IsOutboundOrBlockRelayConn() && state.fSyncStarted) { // This is an outbound peer subject to disconnection if they don't // announce a block with as much work as the current tip within // CHAIN_SYNC_TIMEOUT + HEADERS_RESPONSE_TIME seconds (note: if @@ -3405,12 +3861,12 @@ void PeerLogicValidation::ConsiderEviction(CNode *pto, int64_t time_in_seconds) // message to give the peer a chance to update us. if (state.m_chain_sync.m_sent_getheaders) { // They've run out of time to catch up! - LogPrintf("Disconnecting outbound peer %d for old chain, best known block = %s\n", pto->GetId(), state.pindexBestKnownBlock != nullptr ? state.pindexBestKnownBlock->GetBlockHash().ToString() : "<none>"); - pto->fDisconnect = true; + LogPrintf("Disconnecting outbound peer %d for old chain, best known block = %s\n", pto.GetId(), state.pindexBestKnownBlock != nullptr ? state.pindexBestKnownBlock->GetBlockHash().ToString() : "<none>"); + pto.fDisconnect = true; } else { assert(state.m_chain_sync.m_work_header); - LogPrint(BCLog::NET, "sending getheaders to outbound peer=%d to verify chain work (current best known block:%s, benchmark blockhash: %s)\n", pto->GetId(), state.pindexBestKnownBlock != nullptr ? state.pindexBestKnownBlock->GetBlockHash().ToString() : "<none>", state.m_chain_sync.m_work_header->GetBlockHash().ToString()); - connman->PushMessage(pto, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(state.m_chain_sync.m_work_header->pprev), uint256())); + LogPrint(BCLog::NET, "sending getheaders to outbound peer=%d to verify chain work (current best known block:%s, benchmark blockhash: %s)\n", pto.GetId(), state.pindexBestKnownBlock != nullptr ? state.pindexBestKnownBlock->GetBlockHash().ToString() : "<none>", state.m_chain_sync.m_work_header->GetBlockHash().ToString()); + m_connman.PushMessage(&pto, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(state.m_chain_sync.m_work_header->pprev), uint256())); state.m_chain_sync.m_sent_getheaders = true; constexpr int64_t HEADERS_RESPONSE_TIME = 120; // 2 minutes // Bump the timeout to allow a response, which could clear the timeout @@ -3424,10 +3880,10 @@ void PeerLogicValidation::ConsiderEviction(CNode *pto, int64_t time_in_seconds) } } -void PeerLogicValidation::EvictExtraOutboundPeers(int64_t time_in_seconds) +void PeerManager::EvictExtraOutboundPeers(int64_t time_in_seconds) { // Check whether we have too many outbound peers - int extra_peers = connman->GetExtraOutboundCount(); + int extra_peers = m_connman.GetExtraOutboundCount(); if (extra_peers > 0) { // If we have more outbound peers than we target, disconnect one. // Pick the outbound peer that least recently announced @@ -3436,11 +3892,11 @@ void PeerLogicValidation::EvictExtraOutboundPeers(int64_t time_in_seconds) NodeId worst_peer = -1; int64_t oldest_block_announcement = std::numeric_limits<int64_t>::max(); - connman->ForEachNode([&](CNode* pnode) { - AssertLockHeld(cs_main); + m_connman.ForEachNode([&](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) { + AssertLockHeld(::cs_main); // Ignore non-outbound peers, or nodes marked for disconnect already - if (!IsOutboundDisconnectionCandidate(pnode) || pnode->fDisconnect) return; + if (!pnode->IsOutboundOrBlockRelayConn() || pnode->fDisconnect) return; CNodeState *state = State(pnode->GetId()); if (state == nullptr) return; // shouldn't be possible, but just in case // Don't evict our protected peers @@ -3453,8 +3909,8 @@ void PeerLogicValidation::EvictExtraOutboundPeers(int64_t time_in_seconds) } }); if (worst_peer != -1) { - bool disconnected = connman->ForNode(worst_peer, [&](CNode *pnode) { - AssertLockHeld(cs_main); + bool disconnected = m_connman.ForNode(worst_peer, [&](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) { + AssertLockHeld(::cs_main); // Only disconnect a peer that has been connected to us for // some reasonable fraction of our check-frequency, to give @@ -3477,18 +3933,16 @@ void PeerLogicValidation::EvictExtraOutboundPeers(int64_t time_in_seconds) // detected a stale tip. Don't try any more extra peers until // we next detect a stale tip, to limit the load we put on the // network from these extra connections. - connman->SetTryNewOutboundPeer(false); + m_connman.SetTryNewOutboundPeer(false); } } } } -void PeerLogicValidation::CheckForStaleTipAndEvictPeers(const Consensus::Params &consensusParams) +void PeerManager::CheckForStaleTipAndEvictPeers() { LOCK(cs_main); - if (connman == nullptr) return; - int64_t time_in_seconds = GetTime(); EvictExtraOutboundPeers(time_in_seconds); @@ -3496,11 +3950,11 @@ void PeerLogicValidation::CheckForStaleTipAndEvictPeers(const Consensus::Params if (time_in_seconds > m_stale_tip_check_time) { // Check whether our tip is stale, and if so, allow using an extra // outbound peer - if (!fImporting && !fReindex && connman->GetNetworkActive() && connman->GetUseAddrmanOutgoing() && TipMayBeStale(consensusParams)) { + if (!fImporting && !fReindex && m_connman.GetNetworkActive() && m_connman.GetUseAddrmanOutgoing() && TipMayBeStale(m_chainparams.GetConsensus())) { LogPrintf("Potential stale tip detected, will try using extra outbound peer (last tip update: %d seconds ago)\n", time_in_seconds - g_last_tip_update); - connman->SetTryNewOutboundPeer(true); - } else if (connman->GetTryNewOutboundPeer()) { - connman->SetTryNewOutboundPeer(false); + m_connman.SetTryNewOutboundPeer(true); + } else if (m_connman.GetTryNewOutboundPeer()) { + m_connman.SetTryNewOutboundPeer(false); } m_stale_tip_check_time = time_in_seconds + STALE_CHECK_INTERVAL; } @@ -3510,103 +3964,116 @@ namespace { class CompareInvMempoolOrder { CTxMemPool *mp; + bool m_wtxid_relay; public: - explicit CompareInvMempoolOrder(CTxMemPool *_mempool) + explicit CompareInvMempoolOrder(CTxMemPool *_mempool, bool use_wtxid) { mp = _mempool; + m_wtxid_relay = use_wtxid; } bool operator()(std::set<uint256>::iterator a, std::set<uint256>::iterator b) { /* As std::make_heap produces a max-heap, we want the entries with the * fewest ancestors/highest fee to sort later. */ - return mp->CompareDepthAndScore(*b, *a); + return mp->CompareDepthAndScore(*b, *a, m_wtxid_relay); } }; } -bool PeerLogicValidation::SendMessages(CNode* pto) +bool PeerManager::SendMessages(CNode* pto) { - const Consensus::Params& consensusParams = Params().GetConsensus(); - { - // Don't send anything until the version handshake is complete - if (!pto->fSuccessfullyConnected || pto->fDisconnect) - return true; + const Consensus::Params& consensusParams = m_chainparams.GetConsensus(); - // If we get here, the outgoing message serialization version is set and can't change. - const CNetMsgMaker msgMaker(pto->GetSendVersion()); + // We must call MaybeDiscourageAndDisconnect first, to ensure that we'll + // disconnect misbehaving peers even before the version handshake is complete. + if (MaybeDiscourageAndDisconnect(*pto)) return true; - // - // Message: ping - // - bool pingSend = false; - if (pto->fPingQueued) { - // RPC ping request by user - pingSend = true; - } - if (pto->nPingNonceSent == 0 && pto->nPingUsecStart + PING_INTERVAL * 1000000 < GetTimeMicros()) { - // Ping automatically sent as a latency probe & keepalive. - pingSend = true; - } - if (pingSend) { - uint64_t nonce = 0; - while (nonce == 0) { - GetRandBytes((unsigned char*)&nonce, sizeof(nonce)); - } - pto->fPingQueued = false; - pto->nPingUsecStart = GetTimeMicros(); - if (pto->nVersion > BIP0031_VERSION) { - pto->nPingNonceSent = nonce; - connman->PushMessage(pto, msgMaker.Make(NetMsgType::PING, nonce)); - } else { - // Peer is too old to support ping command with nonce, pong will never arrive. - pto->nPingNonceSent = 0; - connman->PushMessage(pto, msgMaker.Make(NetMsgType::PING)); - } - } + // Don't send anything until the version handshake is complete + if (!pto->fSuccessfullyConnected || pto->fDisconnect) + return true; - TRY_LOCK(cs_main, lockMain); - if (!lockMain) - return true; + // If we get here, the outgoing message serialization version is set and can't change. + const CNetMsgMaker msgMaker(pto->GetCommonVersion()); - if (CheckIfBanned(pto)) return true; + // + // Message: ping + // + bool pingSend = false; + if (pto->fPingQueued) { + // RPC ping request by user + pingSend = true; + } + if (pto->nPingNonceSent == 0 && pto->m_ping_start.load() + PING_INTERVAL < GetTime<std::chrono::microseconds>()) { + // Ping automatically sent as a latency probe & keepalive. + pingSend = true; + } + if (pingSend) { + uint64_t nonce = 0; + while (nonce == 0) { + GetRandBytes((unsigned char*)&nonce, sizeof(nonce)); + } + pto->fPingQueued = false; + pto->m_ping_start = GetTime<std::chrono::microseconds>(); + if (pto->GetCommonVersion() > BIP0031_VERSION) { + pto->nPingNonceSent = nonce; + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::PING, nonce)); + } else { + // Peer is too old to support ping command with nonce, pong will never arrive. + pto->nPingNonceSent = 0; + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::PING)); + } + } + + { + LOCK(cs_main); CNodeState &state = *State(pto->GetId()); // Address refresh broadcast - int64_t nNow = GetTimeMicros(); auto current_time = GetTime<std::chrono::microseconds>(); - if (pto->IsAddrRelayPeer() && !::ChainstateActive().IsInitialBlockDownload() && pto->nNextLocalAddrSend < nNow) { + if (pto->RelayAddrsWithConn() && !::ChainstateActive().IsInitialBlockDownload() && pto->m_next_local_addr_send < current_time) { AdvertiseLocal(pto); - pto->nNextLocalAddrSend = PoissonNextSend(nNow, AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL); + pto->m_next_local_addr_send = PoissonNextSend(current_time, AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL); } // // Message: addr // - if (pto->IsAddrRelayPeer() && pto->nNextAddrSend < nNow) { - pto->nNextAddrSend = PoissonNextSend(nNow, AVG_ADDRESS_BROADCAST_INTERVAL); + if (pto->RelayAddrsWithConn() && pto->m_next_addr_send < current_time) { + pto->m_next_addr_send = PoissonNextSend(current_time, AVG_ADDRESS_BROADCAST_INTERVAL); std::vector<CAddress> vAddr; vAddr.reserve(pto->vAddrToSend.size()); assert(pto->m_addr_known); + + const char* msg_type; + int make_flags; + if (pto->m_wants_addrv2) { + msg_type = NetMsgType::ADDRV2; + make_flags = ADDRV2_FORMAT; + } else { + msg_type = NetMsgType::ADDR; + make_flags = 0; + } + for (const CAddress& addr : pto->vAddrToSend) { if (!pto->m_addr_known->contains(addr.GetKey())) { pto->m_addr_known->insert(addr.GetKey()); vAddr.push_back(addr); - // receiver rejects addr messages larger than 1000 - if (vAddr.size() >= 1000) + // receiver rejects addr messages larger than MAX_ADDR_TO_SEND + if (vAddr.size() >= MAX_ADDR_TO_SEND) { - connman->PushMessage(pto, msgMaker.Make(NetMsgType::ADDR, vAddr)); + m_connman.PushMessage(pto, msgMaker.Make(make_flags, msg_type, vAddr)); vAddr.clear(); } } } pto->vAddrToSend.clear(); if (!vAddr.empty()) - connman->PushMessage(pto, msgMaker.Make(NetMsgType::ADDR, vAddr)); + m_connman.PushMessage(pto, msgMaker.Make(make_flags, msg_type, vAddr)); // we only send the big addr message once if (pto->vAddrToSend.capacity() > 40) pto->vAddrToSend.shrink_to_fit(); @@ -3615,12 +4082,12 @@ bool PeerLogicValidation::SendMessages(CNode* pto) // Start block sync if (pindexBestHeader == nullptr) pindexBestHeader = ::ChainActive().Tip(); - bool fFetch = state.fPreferredDownload || (nPreferredDownload == 0 && !pto->fClient && !pto->fOneShot); // Download if this is a nice peer, or we have no nice peers and this one might do. + bool fFetch = state.fPreferredDownload || (nPreferredDownload == 0 && !pto->fClient && !pto->IsAddrFetchConn()); // Download if this is a nice peer, or we have no nice peers and this one might do. if (!state.fSyncStarted && !pto->fClient && !fImporting && !fReindex) { // Only actively request headers from a single peer, unless we're close to today. if ((nSyncStarted == 0 && fFetch) || pindexBestHeader->GetBlockTime() > GetAdjustedTime() - 24 * 60 * 60) { state.fSyncStarted = true; - state.nHeadersSyncTimeout = GetTimeMicros() + HEADERS_DOWNLOAD_TIMEOUT_BASE + HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER * (GetAdjustedTime() - pindexBestHeader->GetBlockTime())/(consensusParams.nPowTargetSpacing); + state.nHeadersSyncTimeout = count_microseconds(current_time) + HEADERS_DOWNLOAD_TIMEOUT_BASE + HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER * (GetAdjustedTime() - pindexBestHeader->GetBlockTime())/(consensusParams.nPowTargetSpacing); nSyncStarted++; const CBlockIndex *pindexStart = pindexBestHeader; /* If possible, start at the block preceding the currently @@ -3633,7 +4100,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) if (pindexStart->pprev) pindexStart = pindexStart->pprev; LogPrint(BCLog::NET, "initial getheaders (%d) to peer=%d (startheight:%d)\n", pindexStart->nHeight, pto->GetId(), pto->nStartingHeight); - connman->PushMessage(pto, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexStart), uint256())); + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::GETHEADERS, ::ChainActive().GetLocator(pindexStart), uint256())); } } @@ -3717,10 +4184,10 @@ bool PeerLogicValidation::SendMessages(CNode* pto) LOCK(cs_most_recent_block); if (most_recent_block_hash == pBestIndex->GetBlockHash()) { if (state.fWantsCmpctWitness || !fWitnessesPresentInMostRecentCompactBlock) - connman->PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, *most_recent_compact_block)); + m_connman.PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, *most_recent_compact_block)); else { CBlockHeaderAndShortTxIDs cmpctblock(*most_recent_block, state.fWantsCmpctWitness); - connman->PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock)); + m_connman.PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock)); } fGotBlockFromCache = true; } @@ -3730,7 +4197,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) bool ret = ReadBlockFromDisk(block, pBestIndex, consensusParams); assert(ret); CBlockHeaderAndShortTxIDs cmpctblock(block, state.fWantsCmpctWitness); - connman->PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock)); + m_connman.PushMessage(pto, msgMaker.Make(nSendFlags, NetMsgType::CMPCTBLOCK, cmpctblock)); } state.pindexBestHeaderSent = pBestIndex; } else if (state.fPreferHeaders) { @@ -3743,7 +4210,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) LogPrint(BCLog::NET, "%s: sending header %s to peer=%d\n", __func__, vHeaders.front().GetHash().ToString(), pto->GetId()); } - connman->PushMessage(pto, msgMaker.Make(NetMsgType::HEADERS, vHeaders)); + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::HEADERS, vHeaders)); state.pindexBestHeaderSent = pBestIndex; } else fRevertToInv = true; @@ -3767,7 +4234,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) // If the peer's chain has this block, don't inv it back. if (!PeerHasHeader(&state, pindex)) { - pto->PushInventory(CInv(MSG_BLOCK, hashToAnnounce)); + pto->vInventoryBlockToSend.push_back(hashToAnnounce); LogPrint(BCLog::NET, "%s: sending inv peer=%d hash=%s\n", __func__, pto->GetId(), hashToAnnounce.ToString()); } @@ -3788,7 +4255,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) for (const uint256& hash : pto->vInventoryBlockToSend) { vInv.push_back(CInv(MSG_BLOCK, hash)); if (vInv.size() == MAX_INV_SZ) { - connman->PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); vInv.clear(); } } @@ -3800,8 +4267,8 @@ bool PeerLogicValidation::SendMessages(CNode* pto) bool fSendTrickle = pto->HasPermission(PF_NOBAN); if (pto->m_tx_relay->nNextInvSend < current_time) { fSendTrickle = true; - if (pto->fInbound) { - pto->m_tx_relay->nNextInvSend = std::chrono::microseconds{connman->PoissonNextSendInbound(nNow, INVENTORY_BROADCAST_INTERVAL)}; + if (pto->IsInboundConn()) { + pto->m_tx_relay->nNextInvSend = std::chrono::microseconds{m_connman.PoissonNextSendInbound(count_microseconds(current_time), INVENTORY_BROADCAST_INTERVAL)}; } else { // Use half the delay for outbound peers, as there is less privacy concern for them. pto->m_tx_relay->nNextInvSend = PoissonNextSend(current_time, std::chrono::seconds{INVENTORY_BROADCAST_INTERVAL >> 1}); @@ -3816,7 +4283,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) // Respond to BIP35 mempool requests if (fSendTrickle && pto->m_tx_relay->fSendMempool) { - auto vtxinfo = mempool.infoAll(); + auto vtxinfo = m_mempool.infoAll(); pto->m_tx_relay->fSendMempool = false; CFeeRate filterrate; { @@ -3827,8 +4294,8 @@ bool PeerLogicValidation::SendMessages(CNode* pto) LOCK(pto->m_tx_relay->cs_filter); for (const auto& txinfo : vtxinfo) { - const uint256& hash = txinfo.tx->GetHash(); - CInv inv(MSG_TX, hash); + const uint256& hash = state.m_wtxid_relay ? txinfo.tx->GetWitnessHash() : txinfo.tx->GetHash(); + CInv inv(state.m_wtxid_relay ? MSG_WTX : MSG_TX, hash); pto->m_tx_relay->setInventoryTxToSend.erase(hash); // Don't send transactions that peers will not put into their mempool if (txinfo.fee < filterrate.GetFee(txinfo.vsize)) { @@ -3838,9 +4305,10 @@ bool PeerLogicValidation::SendMessages(CNode* pto) if (!pto->m_tx_relay->pfilter->IsRelevantAndUpdate(*txinfo.tx)) continue; } pto->m_tx_relay->filterInventoryKnown.insert(hash); + // Responses to MEMPOOL requests bypass the m_recently_announced_invs filter. vInv.push_back(inv); if (vInv.size() == MAX_INV_SZ) { - connman->PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); vInv.clear(); } } @@ -3862,7 +4330,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) } // Topologically and fee-rate sort the inventory we send for privacy and priority reasons. // A heap is used so that not all items need sorting if only a few are being sent. - CompareInvMempoolOrder compareInvMempoolOrder(&mempool); + CompareInvMempoolOrder compareInvMempoolOrder(&m_mempool, state.m_wtxid_relay); std::make_heap(vInvTx.begin(), vInvTx.end(), compareInvMempoolOrder); // No reason to drain out at many times the network's capacity, // especially since we have many peers and some will draw much shorter delays. @@ -3874,6 +4342,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) std::set<uint256>::iterator it = vInvTx.back(); vInvTx.pop_back(); uint256 hash = *it; + CInv inv(state.m_wtxid_relay ? MSG_WTX : MSG_TX, hash); // Remove it from the to-be-sent set pto->m_tx_relay->setInventoryTxToSend.erase(it); // Check if not in the filter already @@ -3881,49 +4350,62 @@ bool PeerLogicValidation::SendMessages(CNode* pto) continue; } // Not in the mempool anymore? don't bother sending it. - auto txinfo = mempool.info(hash); + auto txinfo = m_mempool.info(ToGenTxid(inv)); if (!txinfo.tx) { continue; } + auto txid = txinfo.tx->GetHash(); + auto wtxid = txinfo.tx->GetWitnessHash(); // Peer told you to not send transactions at that feerate? Don't bother sending it. if (txinfo.fee < filterrate.GetFee(txinfo.vsize)) { continue; } if (pto->m_tx_relay->pfilter && !pto->m_tx_relay->pfilter->IsRelevantAndUpdate(*txinfo.tx)) continue; // Send - vInv.push_back(CInv(MSG_TX, hash)); + State(pto->GetId())->m_recently_announced_invs.insert(hash); + vInv.push_back(inv); nRelayedTransactions++; { // Expire old relay messages - while (!vRelayExpiration.empty() && vRelayExpiration.front().first < nNow) + while (!vRelayExpiration.empty() && vRelayExpiration.front().first < count_microseconds(current_time)) { mapRelay.erase(vRelayExpiration.front().second); vRelayExpiration.pop_front(); } - auto ret = mapRelay.insert(std::make_pair(hash, std::move(txinfo.tx))); + auto ret = mapRelay.emplace(txid, std::move(txinfo.tx)); if (ret.second) { - vRelayExpiration.push_back(std::make_pair(nNow + std::chrono::microseconds{RELAY_TX_CACHE_TIME}.count(), ret.first)); + vRelayExpiration.emplace_back(count_microseconds(current_time + std::chrono::microseconds{RELAY_TX_CACHE_TIME}), ret.first); + } + // Add wtxid-based lookup into mapRelay as well, so that peers can request by wtxid + auto ret2 = mapRelay.emplace(wtxid, ret.first->second); + if (ret2.second) { + vRelayExpiration.emplace_back(count_microseconds(current_time + std::chrono::microseconds{RELAY_TX_CACHE_TIME}), ret2.first); } } if (vInv.size() == MAX_INV_SZ) { - connman->PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); vInv.clear(); } pto->m_tx_relay->filterInventoryKnown.insert(hash); + if (hash != txid) { + // Insert txid into filterInventoryKnown, even for + // wtxidrelay peers. This prevents re-adding of + // unconfirmed parents to the recently_announced + // filter, when a child tx is requested. See + // ProcessGetData(). + pto->m_tx_relay->filterInventoryKnown.insert(txid); + } } } } } if (!vInv.empty()) - connman->PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv)); // Detect whether we're stalling current_time = GetTime<std::chrono::microseconds>(); - // nNow is the current system time (GetTimeMicros is not mockable) and - // should be replaced by the mockable current_time eventually - nNow = GetTimeMicros(); - if (state.nStallingSince && state.nStallingSince < nNow - 1000000 * BLOCK_STALLING_TIMEOUT) { + if (state.nStallingSince && state.nStallingSince < count_microseconds(current_time) - 1000000 * BLOCK_STALLING_TIMEOUT) { // Stalling only triggers when the block download window cannot move. During normal steady state, // the download window should be much larger than the to-be-downloaded set of blocks, so disconnection // should only happen during initial block download. @@ -3939,7 +4421,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) if (state.vBlocksInFlight.size() > 0) { QueuedBlock &queuedBlock = state.vBlocksInFlight.front(); int nOtherPeersWithValidatedDownloads = nPeersWithValidatedDownloads - (state.nBlocksInFlightValidHeaders > 0); - if (nNow > state.nDownloadingSince + consensusParams.nPowTargetSpacing * (BLOCK_DOWNLOAD_TIMEOUT_BASE + BLOCK_DOWNLOAD_TIMEOUT_PER_PEER * nOtherPeersWithValidatedDownloads)) { + if (count_microseconds(current_time) > state.nDownloadingSince + consensusParams.nPowTargetSpacing * (BLOCK_DOWNLOAD_TIMEOUT_BASE + BLOCK_DOWNLOAD_TIMEOUT_PER_PEER * nOtherPeersWithValidatedDownloads)) { LogPrintf("Timeout downloading block %s from peer=%d, disconnecting\n", queuedBlock.hash.ToString(), pto->GetId()); pto->fDisconnect = true; return true; @@ -3948,9 +4430,9 @@ bool PeerLogicValidation::SendMessages(CNode* pto) // Check for headers sync timeouts if (state.fSyncStarted && state.nHeadersSyncTimeout < std::numeric_limits<int64_t>::max()) { // Detect whether this is a stalling initial-headers-sync peer - if (pindexBestHeader->GetBlockTime() <= GetAdjustedTime() - 24*60*60) { - if (nNow > state.nHeadersSyncTimeout && nSyncStarted == 1 && (nPreferredDownload - state.fPreferredDownload >= 1)) { - // Disconnect a (non-whitelisted) peer if it is our only sync peer, + if (pindexBestHeader->GetBlockTime() <= GetAdjustedTime() - 24 * 60 * 60) { + if (count_microseconds(current_time) > state.nHeadersSyncTimeout && nSyncStarted == 1 && (nPreferredDownload - state.fPreferredDownload >= 1)) { + // Disconnect a peer (without the noban permission) if it is our only sync peer, // and we have others we could be using instead. // Note: If all our peers are inbound, then we won't // disconnect our sync peer for stalling; we have bigger @@ -3960,7 +4442,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) pto->fDisconnect = true; return true; } else { - LogPrintf("Timeout downloading headers from whitelisted peer=%d, not disconnecting\n", pto->GetId()); + LogPrintf("Timeout downloading headers from noban peer=%d, not disconnecting\n", pto->GetId()); // Reset the headers sync state so that we have a // chance to try downloading from a different peer. // Note: this will also result in at least one more @@ -3980,7 +4462,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto) // Check that outbound peers have reasonable chains // GetTime() is used by this anti-DoS logic so we can test this using mocktime - ConsiderEviction(pto, GetTime()); + ConsiderEviction(*pto, GetTime()); // // Message: getdata (blocks) @@ -3991,15 +4473,15 @@ bool PeerLogicValidation::SendMessages(CNode* pto) NodeId staller = -1; FindNextBlocksToDownload(pto->GetId(), MAX_BLOCKS_IN_TRANSIT_PER_PEER - state.nBlocksInFlight, vToDownload, staller, consensusParams); for (const CBlockIndex *pindex : vToDownload) { - uint32_t nFetchFlags = GetFetchFlags(pto); + uint32_t nFetchFlags = GetFetchFlags(*pto); vGetData.push_back(CInv(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash())); - MarkBlockAsInFlight(pto->GetId(), pindex->GetBlockHash(), pindex); + MarkBlockAsInFlight(m_mempool, pto->GetId(), pindex->GetBlockHash(), pindex); LogPrint(BCLog::NET, "Requesting block %s (%d) peer=%d\n", pindex->GetBlockHash().ToString(), pindex->nHeight, pto->GetId()); } if (state.nBlocksInFlight == 0 && staller != -1) { if (State(staller)->nStallingSince == 0) { - State(staller)->nStallingSince = nNow; + State(staller)->nStallingSince = count_microseconds(current_time); LogPrint(BCLog::NET, "Stall started peer=%d\n", staller); } } @@ -4008,94 +4490,71 @@ bool PeerLogicValidation::SendMessages(CNode* pto) // // Message: getdata (non-blocks) // - - // For robustness, expire old requests after a long timeout, so that - // we can resume downloading transactions from a peer even if they - // were unresponsive in the past. - // Eventually we should consider disconnecting peers, but this is - // conservative. - if (state.m_tx_download.m_check_expiry_timer <= current_time) { - for (auto it=state.m_tx_download.m_tx_in_flight.begin(); it != state.m_tx_download.m_tx_in_flight.end();) { - if (it->second <= current_time - TX_EXPIRY_INTERVAL) { - LogPrint(BCLog::NET, "timeout of inflight tx %s from peer=%d\n", it->first.ToString(), pto->GetId()); - state.m_tx_download.m_tx_announced.erase(it->first); - state.m_tx_download.m_tx_in_flight.erase(it++); - } else { - ++it; - } - } - // On average, we do this check every TX_EXPIRY_INTERVAL. Randomize - // so that we're not doing this for all peers at the same time. - state.m_tx_download.m_check_expiry_timer = current_time + TX_EXPIRY_INTERVAL / 2 + GetRandMicros(TX_EXPIRY_INTERVAL); - } - - auto& tx_process_time = state.m_tx_download.m_tx_process_time; - while (!tx_process_time.empty() && tx_process_time.begin()->first <= current_time && state.m_tx_download.m_tx_in_flight.size() < MAX_PEER_TX_IN_FLIGHT) { - const uint256 txid = tx_process_time.begin()->second; - // Erase this entry from tx_process_time (it may be added back for - // processing at a later time, see below) - tx_process_time.erase(tx_process_time.begin()); - CInv inv(MSG_TX | GetFetchFlags(pto), txid); - if (!AlreadyHave(inv)) { - // If this transaction was last requested more than 1 minute ago, - // then request. - const auto last_request_time = GetTxRequestTime(inv.hash); - if (last_request_time <= current_time - GETDATA_TX_INTERVAL) { - LogPrint(BCLog::NET, "Requesting %s peer=%d\n", inv.ToString(), pto->GetId()); - vGetData.push_back(inv); - if (vGetData.size() >= MAX_GETDATA_SZ) { - connman->PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData)); - vGetData.clear(); - } - UpdateTxRequestTime(inv.hash, current_time); - state.m_tx_download.m_tx_in_flight.emplace(inv.hash, current_time); - } else { - // This transaction is in flight from someone else; queue - // up processing to happen after the download times out - // (with a slight delay for inbound peers, to prefer - // requests to outbound peers). - const auto next_process_time = CalculateTxGetDataTime(txid, current_time, !state.fPreferredDownload); - tx_process_time.emplace(next_process_time, txid); + std::vector<std::pair<NodeId, GenTxid>> expired; + auto requestable = m_txrequest.GetRequestable(pto->GetId(), current_time, &expired); + for (const auto& entry : expired) { + LogPrint(BCLog::NET, "timeout of inflight %s %s from peer=%d\n", entry.second.IsWtxid() ? "wtx" : "tx", + entry.second.GetHash().ToString(), entry.first); + } + for (const GenTxid& gtxid : requestable) { + if (!AlreadyHaveTx(gtxid, m_mempool)) { + LogPrint(BCLog::NET, "Requesting %s %s peer=%d\n", gtxid.IsWtxid() ? "wtx" : "tx", + gtxid.GetHash().ToString(), pto->GetId()); + vGetData.emplace_back(gtxid.IsWtxid() ? MSG_WTX : (MSG_TX | GetFetchFlags(*pto)), gtxid.GetHash()); + if (vGetData.size() >= MAX_GETDATA_SZ) { + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData)); + vGetData.clear(); } + m_txrequest.RequestedTx(pto->GetId(), gtxid.GetHash(), current_time + GETDATA_TX_INTERVAL); } else { - // We have already seen this transaction, no need to download. - state.m_tx_download.m_tx_announced.erase(inv.hash); - state.m_tx_download.m_tx_in_flight.erase(inv.hash); + // We have already seen this transaction, no need to download. This is just a belt-and-suspenders, as + // this should already be called whenever a transaction becomes AlreadyHaveTx(). + m_txrequest.ForgetTxHash(gtxid.GetHash()); } } if (!vGetData.empty()) - connman->PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData)); + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::GETDATA, vGetData)); // // Message: feefilter // - // We don't want white listed peers to filter txs to us if we have -whitelistforcerelay - if (pto->m_tx_relay != nullptr && pto->nVersion >= FEEFILTER_VERSION && gArgs.GetBoolArg("-feefilter", DEFAULT_FEEFILTER) && - !pto->HasPermission(PF_FORCERELAY)) { - CAmount currentFilter = mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK(); - int64_t timeNow = GetTimeMicros(); - if (timeNow > pto->m_tx_relay->nextSendTimeFeeFilter) { - static CFeeRate default_feerate(DEFAULT_MIN_RELAY_TX_FEE); - static FeeFilterRounder filterRounder(default_feerate); - CAmount filterToSend = filterRounder.round(currentFilter); + if (pto->m_tx_relay != nullptr && pto->GetCommonVersion() >= FEEFILTER_VERSION && gArgs.GetBoolArg("-feefilter", DEFAULT_FEEFILTER) && + !pto->HasPermission(PF_FORCERELAY) // peers with the forcerelay permission should not filter txs to us + ) { + CAmount currentFilter = m_mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFeePerK(); + static FeeFilterRounder g_filter_rounder{CFeeRate{DEFAULT_MIN_RELAY_TX_FEE}}; + if (m_chainman.ActiveChainstate().IsInitialBlockDownload()) { + // Received tx-inv messages are discarded when the active + // chainstate is in IBD, so tell the peer to not send them. + currentFilter = MAX_MONEY; + } else { + static const CAmount MAX_FILTER{g_filter_rounder.round(MAX_MONEY)}; + if (pto->m_tx_relay->lastSentFeeFilter == MAX_FILTER) { + // Send the current filter if we sent MAX_FILTER previously + // and made it out of IBD. + pto->m_tx_relay->nextSendTimeFeeFilter = count_microseconds(current_time) - 1; + } + } + if (count_microseconds(current_time) > pto->m_tx_relay->nextSendTimeFeeFilter) { + CAmount filterToSend = g_filter_rounder.round(currentFilter); // We always have a fee filter of at least minRelayTxFee filterToSend = std::max(filterToSend, ::minRelayTxFee.GetFeePerK()); if (filterToSend != pto->m_tx_relay->lastSentFeeFilter) { - connman->PushMessage(pto, msgMaker.Make(NetMsgType::FEEFILTER, filterToSend)); + m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::FEEFILTER, filterToSend)); pto->m_tx_relay->lastSentFeeFilter = filterToSend; } - pto->m_tx_relay->nextSendTimeFeeFilter = PoissonNextSend(timeNow, AVG_FEEFILTER_BROADCAST_INTERVAL); + pto->m_tx_relay->nextSendTimeFeeFilter = PoissonNextSend(count_microseconds(current_time), AVG_FEEFILTER_BROADCAST_INTERVAL); } // If the fee filter has changed substantially and it's still more than MAX_FEEFILTER_CHANGE_DELAY // until scheduled broadcast, then move the broadcast to within MAX_FEEFILTER_CHANGE_DELAY. - else if (timeNow + MAX_FEEFILTER_CHANGE_DELAY * 1000000 < pto->m_tx_relay->nextSendTimeFeeFilter && + else if (count_microseconds(current_time) + MAX_FEEFILTER_CHANGE_DELAY * 1000000 < pto->m_tx_relay->nextSendTimeFeeFilter && (currentFilter < 3 * pto->m_tx_relay->lastSentFeeFilter / 4 || currentFilter > 4 * pto->m_tx_relay->lastSentFeeFilter / 3)) { - pto->m_tx_relay->nextSendTimeFeeFilter = timeNow + GetRandInt(MAX_FEEFILTER_CHANGE_DELAY) * 1000000; + pto->m_tx_relay->nextSendTimeFeeFilter = count_microseconds(current_time) + GetRandInt(MAX_FEEFILTER_CHANGE_DELAY) * 1000000; } } - } + } // release cs_main return true; } @@ -4107,6 +4566,7 @@ public: // orphan transactions mapOrphanTransactions.clear(); mapOrphanTransactionsByPrev.clear(); + g_orphans_by_wtxid.clear(); } }; static CNetProcessingCleanup instance_of_cnetprocessingcleanup; |