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1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-present The Bitcoin Core developers
3 : : // Distributed under the MIT software license, see the accompanying
4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 : :
6 : : #include <net_processing.h>
7 : :
8 : : #include <addrman.h>
9 : : #include <arith_uint256.h>
10 : : #include <banman.h>
11 : : #include <blockencodings.h>
12 : : #include <blockfilter.h>
13 : : #include <chain.h>
14 : : #include <chainparams.h>
15 : : #include <common/bloom.h>
16 : : #include <consensus/amount.h>
17 : : #include <consensus/params.h>
18 : : #include <consensus/validation.h>
19 : : #include <core_memusage.h>
20 : : #include <crypto/siphash.h>
21 : : #include <deploymentstatus.h>
22 : : #include <flatfile.h>
23 : : #include <headerssync.h>
24 : : #include <index/blockfilterindex.h>
25 : : #include <kernel/chain.h>
26 : : #include <logging.h>
27 : : #include <merkleblock.h>
28 : : #include <net.h>
29 : : #include <net_permissions.h>
30 : : #include <netaddress.h>
31 : : #include <netbase.h>
32 : : #include <netmessagemaker.h>
33 : : #include <node/blockstorage.h>
34 : : #include <node/connection_types.h>
35 : : #include <node/protocol_version.h>
36 : : #include <node/timeoffsets.h>
37 : : #include <node/txdownloadman.h>
38 : : #include <node/txreconciliation.h>
39 : : #include <node/warnings.h>
40 : : #include <policy/feerate.h>
41 : : #include <policy/fees.h>
42 : : #include <policy/packages.h>
43 : : #include <policy/policy.h>
44 : : #include <primitives/block.h>
45 : : #include <primitives/transaction.h>
46 : : #include <protocol.h>
47 : : #include <random.h>
48 : : #include <scheduler.h>
49 : : #include <script/script.h>
50 : : #include <serialize.h>
51 : : #include <span.h>
52 : : #include <streams.h>
53 : : #include <sync.h>
54 : : #include <tinyformat.h>
55 : : #include <txmempool.h>
56 : : #include <txorphanage.h>
57 : : #include <uint256.h>
58 : : #include <util/check.h>
59 : : #include <util/strencodings.h>
60 : : #include <util/time.h>
61 : : #include <util/trace.h>
62 : : #include <validation.h>
63 : :
64 : : #include <algorithm>
65 : : #include <array>
66 : : #include <atomic>
67 : : #include <compare>
68 : : #include <cstddef>
69 : : #include <deque>
70 : : #include <exception>
71 : : #include <functional>
72 : : #include <future>
73 : : #include <initializer_list>
74 : : #include <iterator>
75 : : #include <limits>
76 : : #include <list>
77 : : #include <map>
78 : : #include <memory>
79 : : #include <optional>
80 : : #include <queue>
81 : : #include <ranges>
82 : : #include <ratio>
83 : : #include <set>
84 : : #include <span>
85 : : #include <typeinfo>
86 : : #include <utility>
87 : :
88 : : using namespace util::hex_literals;
89 : :
90 : : TRACEPOINT_SEMAPHORE(net, inbound_message);
91 : : TRACEPOINT_SEMAPHORE(net, misbehaving_connection);
92 : :
93 : : /** Headers download timeout.
94 : : * Timeout = base + per_header * (expected number of headers) */
95 : : static constexpr auto HEADERS_DOWNLOAD_TIMEOUT_BASE = 15min;
96 : : static constexpr auto HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER = 1ms;
97 : : /** How long to wait for a peer to respond to a getheaders request */
98 : : static constexpr auto HEADERS_RESPONSE_TIME{2min};
99 : : /** Protect at least this many outbound peers from disconnection due to slow/
100 : : * behind headers chain.
101 : : */
102 : : static constexpr int32_t MAX_OUTBOUND_PEERS_TO_PROTECT_FROM_DISCONNECT = 4;
103 : : /** Timeout for (unprotected) outbound peers to sync to our chainwork */
104 : : static constexpr auto CHAIN_SYNC_TIMEOUT{20min};
105 : : /** How frequently to check for stale tips */
106 : : static constexpr auto STALE_CHECK_INTERVAL{10min};
107 : : /** How frequently to check for extra outbound peers and disconnect */
108 : : static constexpr auto EXTRA_PEER_CHECK_INTERVAL{45s};
109 : : /** Minimum time an outbound-peer-eviction candidate must be connected for, in order to evict */
110 : : static constexpr auto MINIMUM_CONNECT_TIME{30s};
111 : : /** SHA256("main address relay")[0:8] */
112 : : static constexpr uint64_t RANDOMIZER_ID_ADDRESS_RELAY = 0x3cac0035b5866b90ULL;
113 : : /// Age after which a stale block will no longer be served if requested as
114 : : /// protection against fingerprinting. Set to one month, denominated in seconds.
115 : : static constexpr int STALE_RELAY_AGE_LIMIT = 30 * 24 * 60 * 60;
116 : : /// Age after which a block is considered historical for purposes of rate
117 : : /// limiting block relay. Set to one week, denominated in seconds.
118 : : static constexpr int HISTORICAL_BLOCK_AGE = 7 * 24 * 60 * 60;
119 : : /** Time between pings automatically sent out for latency probing and keepalive */
120 : : static constexpr auto PING_INTERVAL{2min};
121 : : /** The maximum number of entries in a locator */
122 : : static const unsigned int MAX_LOCATOR_SZ = 101;
123 : : /** The maximum number of entries in an 'inv' protocol message */
124 : : static const unsigned int MAX_INV_SZ = 50000;
125 : : /** Limit to avoid sending big packets. Not used in processing incoming GETDATA for compatibility */
126 : : static const unsigned int MAX_GETDATA_SZ = 1000;
127 : : /** Number of blocks that can be requested at any given time from a single peer. */
128 : : static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 16;
129 : : /** Default time during which a peer must stall block download progress before being disconnected.
130 : : * the actual timeout is increased temporarily if peers are disconnected for hitting the timeout */
131 : : static constexpr auto BLOCK_STALLING_TIMEOUT_DEFAULT{2s};
132 : : /** Maximum timeout for stalling block download. */
133 : : static constexpr auto BLOCK_STALLING_TIMEOUT_MAX{64s};
134 : : /** Maximum depth of blocks we're willing to serve as compact blocks to peers
135 : : * when requested. For older blocks, a regular BLOCK response will be sent. */
136 : : static const int MAX_CMPCTBLOCK_DEPTH = 5;
137 : : /** Maximum depth of blocks we're willing to respond to GETBLOCKTXN requests for. */
138 : : static const int MAX_BLOCKTXN_DEPTH = 10;
139 : : static_assert(MAX_BLOCKTXN_DEPTH <= MIN_BLOCKS_TO_KEEP, "MAX_BLOCKTXN_DEPTH too high");
140 : : /** Size of the "block download window": how far ahead of our current height do we fetch?
141 : : * Larger windows tolerate larger download speed differences between peer, but increase the potential
142 : : * degree of disordering of blocks on disk (which make reindexing and pruning harder). We'll probably
143 : : * want to make this a per-peer adaptive value at some point. */
144 : : static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024;
145 : : /** Block download timeout base, expressed in multiples of the block interval (i.e. 10 min) */
146 : : static constexpr double BLOCK_DOWNLOAD_TIMEOUT_BASE = 1;
147 : : /** Additional block download timeout per parallel downloading peer (i.e. 5 min) */
148 : : static constexpr double BLOCK_DOWNLOAD_TIMEOUT_PER_PEER = 0.5;
149 : : /** Maximum number of headers to announce when relaying blocks with headers message.*/
150 : : static const unsigned int MAX_BLOCKS_TO_ANNOUNCE = 8;
151 : : /** Minimum blocks required to signal NODE_NETWORK_LIMITED */
152 : : static const unsigned int NODE_NETWORK_LIMITED_MIN_BLOCKS = 288;
153 : : /** Window, in blocks, for connecting to NODE_NETWORK_LIMITED peers */
154 : : static const unsigned int NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS = 144;
155 : : /** Average delay between local address broadcasts */
156 : : static constexpr auto AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL{24h};
157 : : /** Average delay between peer address broadcasts */
158 : : static constexpr auto AVG_ADDRESS_BROADCAST_INTERVAL{30s};
159 : : /** Delay between rotating the peers we relay a particular address to */
160 : : static constexpr auto ROTATE_ADDR_RELAY_DEST_INTERVAL{24h};
161 : : /** Average delay between trickled inventory transmissions for inbound peers.
162 : : * Blocks and peers with NetPermissionFlags::NoBan permission bypass this. */
163 : : static constexpr auto INBOUND_INVENTORY_BROADCAST_INTERVAL{5s};
164 : : /** Average delay between trickled inventory transmissions for outbound peers.
165 : : * Use a smaller delay as there is less privacy concern for them.
166 : : * Blocks and peers with NetPermissionFlags::NoBan permission bypass this. */
167 : : static constexpr auto OUTBOUND_INVENTORY_BROADCAST_INTERVAL{2s};
168 : : /** Maximum rate of inventory items to send per second.
169 : : * Limits the impact of low-fee transaction floods. */
170 : : static constexpr unsigned int INVENTORY_BROADCAST_PER_SECOND = 7;
171 : : /** Target number of tx inventory items to send per transmission. */
172 : : static constexpr unsigned int INVENTORY_BROADCAST_TARGET = INVENTORY_BROADCAST_PER_SECOND * count_seconds(INBOUND_INVENTORY_BROADCAST_INTERVAL);
173 : : /** Maximum number of inventory items to send per transmission. */
174 : : static constexpr unsigned int INVENTORY_BROADCAST_MAX = 1000;
175 : : static_assert(INVENTORY_BROADCAST_MAX >= INVENTORY_BROADCAST_TARGET, "INVENTORY_BROADCAST_MAX too low");
176 : : static_assert(INVENTORY_BROADCAST_MAX <= node::MAX_PEER_TX_ANNOUNCEMENTS, "INVENTORY_BROADCAST_MAX too high");
177 : : /** Average delay between feefilter broadcasts in seconds. */
178 : : static constexpr auto AVG_FEEFILTER_BROADCAST_INTERVAL{10min};
179 : : /** Maximum feefilter broadcast delay after significant change. */
180 : : static constexpr auto MAX_FEEFILTER_CHANGE_DELAY{5min};
181 : : /** Maximum number of compact filters that may be requested with one getcfilters. See BIP 157. */
182 : : static constexpr uint32_t MAX_GETCFILTERS_SIZE = 1000;
183 : : /** Maximum number of cf hashes that may be requested with one getcfheaders. See BIP 157. */
184 : : static constexpr uint32_t MAX_GETCFHEADERS_SIZE = 2000;
185 : : /** the maximum percentage of addresses from our addrman to return in response to a getaddr message. */
186 : : static constexpr size_t MAX_PCT_ADDR_TO_SEND = 23;
187 : : /** The maximum number of address records permitted in an ADDR message. */
188 : : static constexpr size_t MAX_ADDR_TO_SEND{1000};
189 : : /** The maximum rate of address records we're willing to process on average. Can be bypassed using
190 : : * the NetPermissionFlags::Addr permission. */
191 : : static constexpr double MAX_ADDR_RATE_PER_SECOND{0.1};
192 : : /** The soft limit of the address processing token bucket (the regular MAX_ADDR_RATE_PER_SECOND
193 : : * based increments won't go above this, but the MAX_ADDR_TO_SEND increment following GETADDR
194 : : * is exempt from this limit). */
195 : : static constexpr size_t MAX_ADDR_PROCESSING_TOKEN_BUCKET{MAX_ADDR_TO_SEND};
196 : : /** The compactblocks version we support. See BIP 152. */
197 : : static constexpr uint64_t CMPCTBLOCKS_VERSION{2};
198 : :
199 : : // Internal stuff
200 : : namespace {
201 : : /** Blocks that are in flight, and that are in the queue to be downloaded. */
202 : 115356 : struct QueuedBlock {
203 : : /** BlockIndex. We must have this since we only request blocks when we've already validated the header. */
204 : : const CBlockIndex* pindex;
205 : : /** Optional, used for CMPCTBLOCK downloads */
206 : : std::unique_ptr<PartiallyDownloadedBlock> partialBlock;
207 : : };
208 : :
209 : : /**
210 : : * Data structure for an individual peer. This struct is not protected by
211 : : * cs_main since it does not contain validation-critical data.
212 : : *
213 : : * Memory is owned by shared pointers and this object is destructed when
214 : : * the refcount drops to zero.
215 : : *
216 : : * Mutexes inside this struct must not be held when locking m_peer_mutex.
217 : : *
218 : : * TODO: move most members from CNodeState to this structure.
219 : : * TODO: move remaining application-layer data members from CNode to this structure.
220 : : */
221 : : struct Peer {
222 : : /** Same id as the CNode object for this peer */
223 : : const NodeId m_id{0};
224 : :
225 : : /** Services we offered to this peer.
226 : : *
227 : : * This is supplied by CConnman during peer initialization. It's const
228 : : * because there is no protocol defined for renegotiating services
229 : : * initially offered to a peer. The set of local services we offer should
230 : : * not change after initialization.
231 : : *
232 : : * An interesting example of this is NODE_NETWORK and initial block
233 : : * download: a node which starts up from scratch doesn't have any blocks
234 : : * to serve, but still advertises NODE_NETWORK because it will eventually
235 : : * fulfill this role after IBD completes. P2P code is written in such a
236 : : * way that it can gracefully handle peers who don't make good on their
237 : : * service advertisements. */
238 : : const ServiceFlags m_our_services;
239 : : /** Services this peer offered to us. */
240 : : std::atomic<ServiceFlags> m_their_services{NODE_NONE};
241 : :
242 : : //! Whether this peer is an inbound connection
243 : : const bool m_is_inbound;
244 : :
245 : : /** Protects misbehavior data members */
246 : : Mutex m_misbehavior_mutex;
247 : : /** Whether this peer should be disconnected and marked as discouraged (unless it has NetPermissionFlags::NoBan permission). */
248 : : bool m_should_discourage GUARDED_BY(m_misbehavior_mutex){false};
249 : :
250 : : /** Protects block inventory data members */
251 : : Mutex m_block_inv_mutex;
252 : : /** List of blocks that we'll announce via an `inv` message.
253 : : * There is no final sorting before sending, as they are always sent
254 : : * immediately and in the order requested. */
255 : : std::vector<uint256> m_blocks_for_inv_relay GUARDED_BY(m_block_inv_mutex);
256 : : /** Unfiltered list of blocks that we'd like to announce via a `headers`
257 : : * message. If we can't announce via a `headers` message, we'll fall back to
258 : : * announcing via `inv`. */
259 : : std::vector<uint256> m_blocks_for_headers_relay GUARDED_BY(m_block_inv_mutex);
260 : : /** The final block hash that we sent in an `inv` message to this peer.
261 : : * When the peer requests this block, we send an `inv` message to trigger
262 : : * the peer to request the next sequence of block hashes.
263 : : * Most peers use headers-first syncing, which doesn't use this mechanism */
264 : : uint256 m_continuation_block GUARDED_BY(m_block_inv_mutex) {};
265 : :
266 : : /** Set to true once initial VERSION message was sent (only relevant for outbound peers). */
267 : : bool m_outbound_version_message_sent GUARDED_BY(NetEventsInterface::g_msgproc_mutex){false};
268 : :
269 : : /** This peer's reported block height when we connected */
270 : : std::atomic<int> m_starting_height{-1};
271 : :
272 : : /** The pong reply we're expecting, or 0 if no pong expected. */
273 : : std::atomic<uint64_t> m_ping_nonce_sent{0};
274 : : /** When the last ping was sent, or 0 if no ping was ever sent */
275 : : std::atomic<std::chrono::microseconds> m_ping_start{0us};
276 : : /** Whether a ping has been requested by the user */
277 : : std::atomic<bool> m_ping_queued{false};
278 : :
279 : : /** Whether this peer relays txs via wtxid */
280 : : std::atomic<bool> m_wtxid_relay{false};
281 : : /** The feerate in the most recent BIP133 `feefilter` message sent to the peer.
282 : : * It is *not* a p2p protocol violation for the peer to send us
283 : : * transactions with a lower fee rate than this. See BIP133. */
284 : : CAmount m_fee_filter_sent GUARDED_BY(NetEventsInterface::g_msgproc_mutex){0};
285 : : /** Timestamp after which we will send the next BIP133 `feefilter` message
286 : : * to the peer. */
287 : : std::chrono::microseconds m_next_send_feefilter GUARDED_BY(NetEventsInterface::g_msgproc_mutex){0};
288 : :
289 : : struct TxRelay {
290 : : mutable RecursiveMutex m_bloom_filter_mutex;
291 : : /** Whether we relay transactions to this peer. */
292 : : bool m_relay_txs GUARDED_BY(m_bloom_filter_mutex){false};
293 : : /** A bloom filter for which transactions to announce to the peer. See BIP37. */
294 : : std::unique_ptr<CBloomFilter> m_bloom_filter PT_GUARDED_BY(m_bloom_filter_mutex) GUARDED_BY(m_bloom_filter_mutex){nullptr};
295 : :
296 : : mutable RecursiveMutex m_tx_inventory_mutex;
297 : : /** A filter of all the (w)txids that the peer has announced to
298 : : * us or we have announced to the peer. We use this to avoid announcing
299 : : * the same (w)txid to a peer that already has the transaction. */
300 : : CRollingBloomFilter m_tx_inventory_known_filter GUARDED_BY(m_tx_inventory_mutex){50000, 0.000001};
301 : : /** Set of transaction ids we still have to announce (txid for
302 : : * non-wtxid-relay peers, wtxid for wtxid-relay peers). We use the
303 : : * mempool to sort transactions in dependency order before relay, so
304 : : * this does not have to be sorted. */
305 : : std::set<uint256> m_tx_inventory_to_send GUARDED_BY(m_tx_inventory_mutex);
306 : : /** Whether the peer has requested us to send our complete mempool. Only
307 : : * permitted if the peer has NetPermissionFlags::Mempool or we advertise
308 : : * NODE_BLOOM. See BIP35. */
309 : : bool m_send_mempool GUARDED_BY(m_tx_inventory_mutex){false};
310 : : /** The next time after which we will send an `inv` message containing
311 : : * transaction announcements to this peer. */
312 : : std::chrono::microseconds m_next_inv_send_time GUARDED_BY(m_tx_inventory_mutex){0};
313 : : /** The mempool sequence num at which we sent the last `inv` message to this peer.
314 : : * Can relay txs with lower sequence numbers than this (see CTxMempool::info_for_relay). */
315 : : uint64_t m_last_inv_sequence GUARDED_BY(NetEventsInterface::g_msgproc_mutex){1};
316 : :
317 : : /** Minimum fee rate with which to filter transaction announcements to this node. See BIP133. */
318 : : std::atomic<CAmount> m_fee_filter_received{0};
319 : : };
320 : :
321 : : /* Initializes a TxRelay struct for this peer. Can be called at most once for a peer. */
322 : 1451 : TxRelay* SetTxRelay() EXCLUSIVE_LOCKS_REQUIRED(!m_tx_relay_mutex)
323 : : {
324 : 1451 : LOCK(m_tx_relay_mutex);
325 [ + - ]: 1451 : Assume(!m_tx_relay);
326 [ + - ]: 1451 : m_tx_relay = std::make_unique<Peer::TxRelay>();
327 [ + - ]: 1451 : return m_tx_relay.get();
328 : 1451 : };
329 : :
330 : 518729 : TxRelay* GetTxRelay() EXCLUSIVE_LOCKS_REQUIRED(!m_tx_relay_mutex)
331 : : {
332 [ + - + - : 905010 : return WITH_LOCK(m_tx_relay_mutex, return m_tx_relay.get());
+ - + - +
- + - + -
+ - + - +
- + - ]
333 : : };
334 : :
335 : : /** A vector of addresses to send to the peer, limited to MAX_ADDR_TO_SEND. */
336 : : std::vector<CAddress> m_addrs_to_send GUARDED_BY(NetEventsInterface::g_msgproc_mutex);
337 : : /** Probabilistic filter to track recent addr messages relayed with this
338 : : * peer. Used to avoid relaying redundant addresses to this peer.
339 : : *
340 : : * We initialize this filter for outbound peers (other than
341 : : * block-relay-only connections) or when an inbound peer sends us an
342 : : * address related message (ADDR, ADDRV2, GETADDR).
343 : : *
344 : : * Presence of this filter must correlate with m_addr_relay_enabled.
345 : : **/
346 : : std::unique_ptr<CRollingBloomFilter> m_addr_known GUARDED_BY(NetEventsInterface::g_msgproc_mutex);
347 : : /** Whether we are participating in address relay with this connection.
348 : : *
349 : : * We set this bool to true for outbound peers (other than
350 : : * block-relay-only connections), or when an inbound peer sends us an
351 : : * address related message (ADDR, ADDRV2, GETADDR).
352 : : *
353 : : * We use this bool to decide whether a peer is eligible for gossiping
354 : : * addr messages. This avoids relaying to peers that are unlikely to
355 : : * forward them, effectively blackholing self announcements. Reasons
356 : : * peers might support addr relay on the link include that they connected
357 : : * to us as a block-relay-only peer or they are a light client.
358 : : *
359 : : * This field must correlate with whether m_addr_known has been
360 : : * initialized.*/
361 : : std::atomic_bool m_addr_relay_enabled{false};
362 : : /** Whether a getaddr request to this peer is outstanding. */
363 : : bool m_getaddr_sent GUARDED_BY(NetEventsInterface::g_msgproc_mutex){false};
364 : : /** Guards address sending timers. */
365 : : mutable Mutex m_addr_send_times_mutex;
366 : : /** Time point to send the next ADDR message to this peer. */
367 : : std::chrono::microseconds m_next_addr_send GUARDED_BY(m_addr_send_times_mutex){0};
368 : : /** Time point to possibly re-announce our local address to this peer. */
369 : : std::chrono::microseconds m_next_local_addr_send GUARDED_BY(m_addr_send_times_mutex){0};
370 : : /** Whether the peer has signaled support for receiving ADDRv2 (BIP155)
371 : : * messages, indicating a preference to receive ADDRv2 instead of ADDR ones. */
372 : : std::atomic_bool m_wants_addrv2{false};
373 : : /** Whether this peer has already sent us a getaddr message. */
374 : : bool m_getaddr_recvd GUARDED_BY(NetEventsInterface::g_msgproc_mutex){false};
375 : : /** Number of addresses that can be processed from this peer. Start at 1 to
376 : : * permit self-announcement. */
377 : : double m_addr_token_bucket GUARDED_BY(NetEventsInterface::g_msgproc_mutex){1.0};
378 : : /** When m_addr_token_bucket was last updated */
379 : : std::chrono::microseconds m_addr_token_timestamp GUARDED_BY(NetEventsInterface::g_msgproc_mutex){GetTime<std::chrono::microseconds>()};
380 : : /** Total number of addresses that were dropped due to rate limiting. */
381 : : std::atomic<uint64_t> m_addr_rate_limited{0};
382 : : /** Total number of addresses that were processed (excludes rate-limited ones). */
383 : : std::atomic<uint64_t> m_addr_processed{0};
384 : :
385 : : /** Whether we've sent this peer a getheaders in response to an inv prior to initial-headers-sync completing */
386 : : bool m_inv_triggered_getheaders_before_sync GUARDED_BY(NetEventsInterface::g_msgproc_mutex){false};
387 : :
388 : : /** Protects m_getdata_requests **/
389 : : Mutex m_getdata_requests_mutex;
390 : : /** Work queue of items requested by this peer **/
391 : : std::deque<CInv> m_getdata_requests GUARDED_BY(m_getdata_requests_mutex);
392 : :
393 : : /** Time of the last getheaders message to this peer */
394 : : NodeClock::time_point m_last_getheaders_timestamp GUARDED_BY(NetEventsInterface::g_msgproc_mutex){};
395 : :
396 : : /** Protects m_headers_sync **/
397 : : Mutex m_headers_sync_mutex;
398 : : /** Headers-sync state for this peer (eg for initial sync, or syncing large
399 : : * reorgs) **/
400 : : std::unique_ptr<HeadersSyncState> m_headers_sync PT_GUARDED_BY(m_headers_sync_mutex) GUARDED_BY(m_headers_sync_mutex) {};
401 : :
402 : : /** Whether we've sent our peer a sendheaders message. **/
403 : : std::atomic<bool> m_sent_sendheaders{false};
404 : :
405 : : /** When to potentially disconnect peer for stalling headers download */
406 : : std::chrono::microseconds m_headers_sync_timeout GUARDED_BY(NetEventsInterface::g_msgproc_mutex){0us};
407 : :
408 : : /** Whether this peer wants invs or headers (when possible) for block announcements */
409 : : bool m_prefers_headers GUARDED_BY(NetEventsInterface::g_msgproc_mutex){false};
410 : :
411 : : /** Time offset computed during the version handshake based on the
412 : : * timestamp the peer sent in the version message. */
413 : : std::atomic<std::chrono::seconds> m_time_offset{0s};
414 : :
415 : 1573 : explicit Peer(NodeId id, ServiceFlags our_services, bool is_inbound)
416 : 1573 : : m_id{id}
417 : 1573 : , m_our_services{our_services}
418 [ + - ]: 1573 : , m_is_inbound{is_inbound}
419 : 1573 : {}
420 : :
421 : : private:
422 : : mutable Mutex m_tx_relay_mutex;
423 : :
424 : : /** Transaction relay data. May be a nullptr. */
425 : : std::unique_ptr<TxRelay> m_tx_relay GUARDED_BY(m_tx_relay_mutex);
426 : : };
427 : :
428 : : using PeerRef = std::shared_ptr<Peer>;
429 : :
430 : : /**
431 : : * Maintain validation-specific state about nodes, protected by cs_main, instead
432 : : * by CNode's own locks. This simplifies asynchronous operation, where
433 : : * processing of incoming data is done after the ProcessMessage call returns,
434 : : * and we're no longer holding the node's locks.
435 : : */
436 : 1573 : struct CNodeState {
437 : : //! The best known block we know this peer has announced.
438 : : const CBlockIndex* pindexBestKnownBlock{nullptr};
439 : : //! The hash of the last unknown block this peer has announced.
440 : : uint256 hashLastUnknownBlock{};
441 : : //! The last full block we both have.
442 : : const CBlockIndex* pindexLastCommonBlock{nullptr};
443 : : //! The best header we have sent our peer.
444 : : const CBlockIndex* pindexBestHeaderSent{nullptr};
445 : : //! Whether we've started headers synchronization with this peer.
446 : : bool fSyncStarted{false};
447 : : //! Since when we're stalling block download progress (in microseconds), or 0.
448 : : std::chrono::microseconds m_stalling_since{0us};
449 : : std::list<QueuedBlock> vBlocksInFlight;
450 : : //! When the first entry in vBlocksInFlight started downloading. Don't care when vBlocksInFlight is empty.
451 : : std::chrono::microseconds m_downloading_since{0us};
452 : : //! Whether we consider this a preferred download peer.
453 : : bool fPreferredDownload{false};
454 : : /** Whether this peer wants invs or cmpctblocks (when possible) for block announcements. */
455 : : bool m_requested_hb_cmpctblocks{false};
456 : : /** Whether this peer will send us cmpctblocks if we request them. */
457 : : bool m_provides_cmpctblocks{false};
458 : :
459 : : /** State used to enforce CHAIN_SYNC_TIMEOUT and EXTRA_PEER_CHECK_INTERVAL logic.
460 : : *
461 : : * Both are only in effect for outbound, non-manual, non-protected connections.
462 : : * Any peer protected (m_protect = true) is not chosen for eviction. A peer is
463 : : * marked as protected if all of these are true:
464 : : * - its connection type is IsBlockOnlyConn() == false
465 : : * - it gave us a valid connecting header
466 : : * - we haven't reached MAX_OUTBOUND_PEERS_TO_PROTECT_FROM_DISCONNECT yet
467 : : * - its chain tip has at least as much work as ours
468 : : *
469 : : * CHAIN_SYNC_TIMEOUT: if a peer's best known block has less work than our tip,
470 : : * set a timeout CHAIN_SYNC_TIMEOUT in the future:
471 : : * - If at timeout their best known block now has more work than our tip
472 : : * when the timeout was set, then either reset the timeout or clear it
473 : : * (after comparing against our current tip's work)
474 : : * - If at timeout their best known block still has less work than our
475 : : * tip did when the timeout was set, then send a getheaders message,
476 : : * and set a shorter timeout, HEADERS_RESPONSE_TIME seconds in future.
477 : : * If their best known block is still behind when that new timeout is
478 : : * reached, disconnect.
479 : : *
480 : : * EXTRA_PEER_CHECK_INTERVAL: after each interval, if we have too many outbound peers,
481 : : * drop the outbound one that least recently announced us a new block.
482 : : */
483 : : struct ChainSyncTimeoutState {
484 : : //! A timeout used for checking whether our peer has sufficiently synced
485 : : std::chrono::seconds m_timeout{0s};
486 : : //! A header with the work we require on our peer's chain
487 : : const CBlockIndex* m_work_header{nullptr};
488 : : //! After timeout is reached, set to true after sending getheaders
489 : : bool m_sent_getheaders{false};
490 : : //! Whether this peer is protected from disconnection due to a bad/slow chain
491 : : bool m_protect{false};
492 : : };
493 : :
494 : : ChainSyncTimeoutState m_chain_sync;
495 : :
496 : : //! Time of last new block announcement
497 : : int64_t m_last_block_announcement{0};
498 : : };
499 : :
500 : : class PeerManagerImpl final : public PeerManager
501 : : {
502 : : public:
503 : : PeerManagerImpl(CConnman& connman, AddrMan& addrman,
504 : : BanMan* banman, ChainstateManager& chainman,
505 : : CTxMemPool& pool, node::Warnings& warnings, Options opts);
506 : :
507 : : /** Overridden from CValidationInterface. */
508 : : void ActiveTipChange(const CBlockIndex& new_tip, bool) override
509 : : EXCLUSIVE_LOCKS_REQUIRED(!m_tx_download_mutex);
510 : : void BlockConnected(ChainstateRole role, const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindexConnected) override
511 : : EXCLUSIVE_LOCKS_REQUIRED(!m_tx_download_mutex);
512 : : void BlockDisconnected(const std::shared_ptr<const CBlock> &block, const CBlockIndex* pindex) override
513 : : EXCLUSIVE_LOCKS_REQUIRED(!m_tx_download_mutex);
514 : : void UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) override
515 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
516 : : void BlockChecked(const CBlock& block, const BlockValidationState& state) override
517 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
518 : : void NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock) override
519 : : EXCLUSIVE_LOCKS_REQUIRED(!m_most_recent_block_mutex);
520 : :
521 : : /** Implement NetEventsInterface */
522 : : void InitializeNode(const CNode& node, ServiceFlags our_services) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, !m_tx_download_mutex);
523 : : void FinalizeNode(const CNode& node) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, !m_headers_presync_mutex, !m_tx_download_mutex);
524 : : bool HasAllDesirableServiceFlags(ServiceFlags services) const override;
525 : : bool ProcessMessages(CNode* pfrom, std::atomic<bool>& interrupt) override
526 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, !m_most_recent_block_mutex, !m_headers_presync_mutex, g_msgproc_mutex, !m_tx_download_mutex);
527 : : bool SendMessages(CNode* pto) override
528 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, !m_most_recent_block_mutex, g_msgproc_mutex, !m_tx_download_mutex);
529 : :
530 : : /** Implement PeerManager */
531 : : void StartScheduledTasks(CScheduler& scheduler) override;
532 : : void CheckForStaleTipAndEvictPeers() override;
533 : : std::optional<std::string> FetchBlock(NodeId peer_id, const CBlockIndex& block_index) override
534 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
535 : : bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
536 : : std::vector<TxOrphanage::OrphanTxBase> GetOrphanTransactions() override EXCLUSIVE_LOCKS_REQUIRED(!m_tx_download_mutex);
537 : : PeerManagerInfo GetInfo() const override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
538 : : void SendPings() override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
539 : : void RelayTransaction(const uint256& txid, const uint256& wtxid) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
540 : 111800 : void SetBestBlock(int height, std::chrono::seconds time) override
541 : : {
542 : 111800 : m_best_height = height;
543 : 111800 : m_best_block_time = time;
544 : 111800 : };
545 [ + - + - : 8 : void UnitTestMisbehaving(NodeId peer_id) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex) { Misbehaving(*Assert(GetPeerRef(peer_id)), ""); };
+ - ]
546 : : void ProcessMessage(CNode& pfrom, const std::string& msg_type, DataStream& vRecv,
547 : : const std::chrono::microseconds time_received, const std::atomic<bool>& interruptMsgProc) override
548 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, !m_most_recent_block_mutex, !m_headers_presync_mutex, g_msgproc_mutex, !m_tx_download_mutex);
549 : : void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds) override;
550 : : ServiceFlags GetDesirableServiceFlags(ServiceFlags services) const override;
551 : :
552 : : private:
553 : : /** Consider evicting an outbound peer based on the amount of time they've been behind our tip */
554 : : void ConsiderEviction(CNode& pto, Peer& peer, std::chrono::seconds time_in_seconds) EXCLUSIVE_LOCKS_REQUIRED(cs_main, g_msgproc_mutex);
555 : :
556 : : /** If we have extra outbound peers, try to disconnect the one with the oldest block announcement */
557 : : void EvictExtraOutboundPeers(std::chrono::seconds now) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
558 : :
559 : : /** Retrieve unbroadcast transactions from the mempool and reattempt sending to peers */
560 : : void ReattemptInitialBroadcast(CScheduler& scheduler) EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
561 : :
562 : : /** Get a shared pointer to the Peer object.
563 : : * May return an empty shared_ptr if the Peer object can't be found. */
564 : : PeerRef GetPeerRef(NodeId id) const EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
565 : :
566 : : /** Get a shared pointer to the Peer object and remove it from m_peer_map.
567 : : * May return an empty shared_ptr if the Peer object can't be found. */
568 : : PeerRef RemovePeer(NodeId id) EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
569 : :
570 : : /** Mark a peer as misbehaving, which will cause it to be disconnected and its
571 : : * address discouraged. */
572 : : void Misbehaving(Peer& peer, const std::string& message);
573 : :
574 : : /**
575 : : * Potentially mark a node discouraged based on the contents of a BlockValidationState object
576 : : *
577 : : * @param[in] via_compact_block this bool is passed in because net_processing should
578 : : * punish peers differently depending on whether the data was provided in a compact
579 : : * block message or not. If the compact block had a valid header, but contained invalid
580 : : * txs, the peer should not be punished. See BIP 152.
581 : : */
582 : : void MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& state,
583 : : bool via_compact_block, const std::string& message = "")
584 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
585 : :
586 : : /**
587 : : * Potentially disconnect and discourage a node based on the contents of a TxValidationState object
588 : : */
589 : : void MaybePunishNodeForTx(NodeId nodeid, const TxValidationState& state)
590 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
591 : :
592 : : /** Maybe disconnect a peer and discourage future connections from its address.
593 : : *
594 : : * @param[in] pnode The node to check.
595 : : * @param[in] peer The peer object to check.
596 : : * @return True if the peer was marked for disconnection in this function
597 : : */
598 : : bool MaybeDiscourageAndDisconnect(CNode& pnode, Peer& peer);
599 : :
600 : : /** Handle a transaction whose result was not MempoolAcceptResult::ResultType::VALID.
601 : : * @param[in] first_time_failure Whether we should consider inserting into vExtraTxnForCompact, adding
602 : : * a new orphan to resolve, or looking for a package to submit.
603 : : * Set to true for transactions just received over p2p.
604 : : * Set to false if the tx has already been rejected before,
605 : : * e.g. is already in the orphanage, to avoid adding duplicate entries.
606 : : * Updates m_txrequest, m_lazy_recent_rejects, m_lazy_recent_rejects_reconsiderable, m_orphanage, and vExtraTxnForCompact.
607 : : *
608 : : * @returns a PackageToValidate if this transaction has a reconsiderable failure and an eligible package was found,
609 : : * or std::nullopt otherwise.
610 : : */
611 : : std::optional<node::PackageToValidate> ProcessInvalidTx(NodeId nodeid, const CTransactionRef& tx, const TxValidationState& result,
612 : : bool first_time_failure)
613 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex, m_tx_download_mutex);
614 : :
615 : : /** Handle a transaction whose result was MempoolAcceptResult::ResultType::VALID.
616 : : * Updates m_txrequest, m_orphanage, and vExtraTxnForCompact. Also queues the tx for relay. */
617 : : void ProcessValidTx(NodeId nodeid, const CTransactionRef& tx, const std::list<CTransactionRef>& replaced_transactions)
618 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex, m_tx_download_mutex);
619 : :
620 : : /** Handle the results of package validation: calls ProcessValidTx and ProcessInvalidTx for
621 : : * individual transactions, and caches rejection for the package as a group.
622 : : */
623 : : void ProcessPackageResult(const node::PackageToValidate& package_to_validate, const PackageMempoolAcceptResult& package_result)
624 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex, m_tx_download_mutex);
625 : :
626 : : /**
627 : : * Reconsider orphan transactions after a parent has been accepted to the mempool.
628 : : *
629 : : * @peer[in] peer The peer whose orphan transactions we will reconsider. Generally only
630 : : * one orphan will be reconsidered on each call of this function. If an
631 : : * accepted orphan has orphaned children, those will need to be
632 : : * reconsidered, creating more work, possibly for other peers.
633 : : * @return True if meaningful work was done (an orphan was accepted/rejected).
634 : : * If no meaningful work was done, then the work set for this peer
635 : : * will be empty.
636 : : */
637 : : bool ProcessOrphanTx(Peer& peer)
638 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex, !m_tx_download_mutex);
639 : :
640 : : /** Process a single headers message from a peer.
641 : : *
642 : : * @param[in] pfrom CNode of the peer
643 : : * @param[in] peer The peer sending us the headers
644 : : * @param[in] headers The headers received. Note that this may be modified within ProcessHeadersMessage.
645 : : * @param[in] via_compact_block Whether this header came in via compact block handling.
646 : : */
647 : : void ProcessHeadersMessage(CNode& pfrom, Peer& peer,
648 : : std::vector<CBlockHeader>&& headers,
649 : : bool via_compact_block)
650 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, !m_headers_presync_mutex, g_msgproc_mutex);
651 : : /** Various helpers for headers processing, invoked by ProcessHeadersMessage() */
652 : : /** Return true if headers are continuous and have valid proof-of-work (DoS points assigned on failure) */
653 : : bool CheckHeadersPoW(const std::vector<CBlockHeader>& headers, const Consensus::Params& consensusParams, Peer& peer);
654 : : /** Calculate an anti-DoS work threshold for headers chains */
655 : : arith_uint256 GetAntiDoSWorkThreshold();
656 : : /** Deal with state tracking and headers sync for peers that send
657 : : * non-connecting headers (this can happen due to BIP 130 headers
658 : : * announcements for blocks interacting with the 2hr (MAX_FUTURE_BLOCK_TIME) rule). */
659 : : void HandleUnconnectingHeaders(CNode& pfrom, Peer& peer, const std::vector<CBlockHeader>& headers) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
660 : : /** Return true if the headers connect to each other, false otherwise */
661 : : bool CheckHeadersAreContinuous(const std::vector<CBlockHeader>& headers) const;
662 : : /** Try to continue a low-work headers sync that has already begun.
663 : : * Assumes the caller has already verified the headers connect, and has
664 : : * checked that each header satisfies the proof-of-work target included in
665 : : * the header.
666 : : * @param[in] peer The peer we're syncing with.
667 : : * @param[in] pfrom CNode of the peer
668 : : * @param[in,out] headers The headers to be processed.
669 : : * @return True if the passed in headers were successfully processed
670 : : * as the continuation of a low-work headers sync in progress;
671 : : * false otherwise.
672 : : * If false, the passed in headers will be returned back to
673 : : * the caller.
674 : : * If true, the returned headers may be empty, indicating
675 : : * there is no more work for the caller to do; or the headers
676 : : * may be populated with entries that have passed anti-DoS
677 : : * checks (and therefore may be validated for block index
678 : : * acceptance by the caller).
679 : : */
680 : : bool IsContinuationOfLowWorkHeadersSync(Peer& peer, CNode& pfrom,
681 : : std::vector<CBlockHeader>& headers)
682 : : EXCLUSIVE_LOCKS_REQUIRED(peer.m_headers_sync_mutex, !m_headers_presync_mutex, g_msgproc_mutex);
683 : : /** Check work on a headers chain to be processed, and if insufficient,
684 : : * initiate our anti-DoS headers sync mechanism.
685 : : *
686 : : * @param[in] peer The peer whose headers we're processing.
687 : : * @param[in] pfrom CNode of the peer
688 : : * @param[in] chain_start_header Where these headers connect in our index.
689 : : * @param[in,out] headers The headers to be processed.
690 : : *
691 : : * @return True if chain was low work (headers will be empty after
692 : : * calling); false otherwise.
693 : : */
694 : : bool TryLowWorkHeadersSync(Peer& peer, CNode& pfrom,
695 : : const CBlockIndex* chain_start_header,
696 : : std::vector<CBlockHeader>& headers)
697 : : EXCLUSIVE_LOCKS_REQUIRED(!peer.m_headers_sync_mutex, !m_peer_mutex, !m_headers_presync_mutex, g_msgproc_mutex);
698 : :
699 : : /** Return true if the given header is an ancestor of
700 : : * m_chainman.m_best_header or our current tip */
701 : : bool IsAncestorOfBestHeaderOrTip(const CBlockIndex* header) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
702 : :
703 : : /** Request further headers from this peer with a given locator.
704 : : * We don't issue a getheaders message if we have a recent one outstanding.
705 : : * This returns true if a getheaders is actually sent, and false otherwise.
706 : : */
707 : : bool MaybeSendGetHeaders(CNode& pfrom, const CBlockLocator& locator, Peer& peer) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
708 : : /** Potentially fetch blocks from this peer upon receipt of a new headers tip */
709 : : void HeadersDirectFetchBlocks(CNode& pfrom, const Peer& peer, const CBlockIndex& last_header);
710 : : /** Update peer state based on received headers message */
711 : : void UpdatePeerStateForReceivedHeaders(CNode& pfrom, Peer& peer, const CBlockIndex& last_header, bool received_new_header, bool may_have_more_headers)
712 : : EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
713 : :
714 : : void SendBlockTransactions(CNode& pfrom, Peer& peer, const CBlock& block, const BlockTransactionsRequest& req);
715 : :
716 : : /** Send a message to a peer */
717 [ + - ]: 58 : void PushMessage(CNode& node, CSerializedNetMsg&& msg) const { m_connman.PushMessage(&node, std::move(msg)); }
718 : : template <typename... Args>
719 : 143862 : void MakeAndPushMessage(CNode& node, std::string msg_type, Args&&... args) const
720 : : {
721 [ + - + - ]: 287724 : m_connman.PushMessage(&node, NetMsg::Make(std::move(msg_type), std::forward<Args>(args)...));
722 : 143862 : }
723 : :
724 : : /** Send a version message to a peer */
725 : : void PushNodeVersion(CNode& pnode, const Peer& peer);
726 : :
727 : : /** Send a ping message every PING_INTERVAL or if requested via RPC. May
728 : : * mark the peer to be disconnected if a ping has timed out.
729 : : * We use mockable time for ping timeouts, so setmocktime may cause pings
730 : : * to time out. */
731 : : void MaybeSendPing(CNode& node_to, Peer& peer, std::chrono::microseconds now);
732 : :
733 : : /** Send `addr` messages on a regular schedule. */
734 : : void MaybeSendAddr(CNode& node, Peer& peer, std::chrono::microseconds current_time) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
735 : :
736 : : /** Send a single `sendheaders` message, after we have completed headers sync with a peer. */
737 : : void MaybeSendSendHeaders(CNode& node, Peer& peer) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
738 : :
739 : : /** Relay (gossip) an address to a few randomly chosen nodes.
740 : : *
741 : : * @param[in] originator The id of the peer that sent us the address. We don't want to relay it back.
742 : : * @param[in] addr Address to relay.
743 : : * @param[in] fReachable Whether the address' network is reachable. We relay unreachable
744 : : * addresses less.
745 : : */
746 : : void RelayAddress(NodeId originator, const CAddress& addr, bool fReachable) EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex);
747 : :
748 : : /** Send `feefilter` message. */
749 : : void MaybeSendFeefilter(CNode& node, Peer& peer, std::chrono::microseconds current_time) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
750 : :
751 : : FastRandomContext m_rng GUARDED_BY(NetEventsInterface::g_msgproc_mutex);
752 : :
753 : : FeeFilterRounder m_fee_filter_rounder GUARDED_BY(NetEventsInterface::g_msgproc_mutex);
754 : :
755 : : const CChainParams& m_chainparams;
756 : : CConnman& m_connman;
757 : : AddrMan& m_addrman;
758 : : /** Pointer to this node's banman. May be nullptr - check existence before dereferencing. */
759 : : BanMan* const m_banman;
760 : : ChainstateManager& m_chainman;
761 : : CTxMemPool& m_mempool;
762 : :
763 : : /** Synchronizes tx download including TxRequestTracker, rejection filters, and TxOrphanage.
764 : : * Lock invariants:
765 : : * - A txhash (txid or wtxid) in m_txrequest is not also in m_orphanage.
766 : : * - A txhash (txid or wtxid) in m_txrequest is not also in m_lazy_recent_rejects.
767 : : * - A txhash (txid or wtxid) in m_txrequest is not also in m_lazy_recent_rejects_reconsiderable.
768 : : * - A txhash (txid or wtxid) in m_txrequest is not also in m_lazy_recent_confirmed_transactions.
769 : : * - Each data structure's limits hold (m_orphanage max size, m_txrequest per-peer limits, etc).
770 : : */
771 : : Mutex m_tx_download_mutex ACQUIRED_BEFORE(m_mempool.cs);
772 : : node::TxDownloadManager m_txdownloadman GUARDED_BY(m_tx_download_mutex);
773 : :
774 : : std::unique_ptr<TxReconciliationTracker> m_txreconciliation;
775 : :
776 : : /** The height of the best chain */
777 : : std::atomic<int> m_best_height{-1};
778 : : /** The time of the best chain tip block */
779 : : std::atomic<std::chrono::seconds> m_best_block_time{0s};
780 : :
781 : : /** Next time to check for stale tip */
782 : : std::chrono::seconds m_stale_tip_check_time GUARDED_BY(cs_main){0s};
783 : :
784 : : node::Warnings& m_warnings;
785 : : TimeOffsets m_outbound_time_offsets{m_warnings};
786 : :
787 : : const Options m_opts;
788 : :
789 : : bool RejectIncomingTxs(const CNode& peer) const;
790 : :
791 : : /** Whether we've completed initial sync yet, for determining when to turn
792 : : * on extra block-relay-only peers. */
793 : : bool m_initial_sync_finished GUARDED_BY(cs_main){false};
794 : :
795 : : /** Protects m_peer_map. This mutex must not be locked while holding a lock
796 : : * on any of the mutexes inside a Peer object. */
797 : : mutable Mutex m_peer_mutex;
798 : : /**
799 : : * Map of all Peer objects, keyed by peer id. This map is protected
800 : : * by the m_peer_mutex. Once a shared pointer reference is
801 : : * taken, the lock may be released. Individual fields are protected by
802 : : * their own locks.
803 : : */
804 : : std::map<NodeId, PeerRef> m_peer_map GUARDED_BY(m_peer_mutex);
805 : :
806 : : /** Map maintaining per-node state. */
807 : : std::map<NodeId, CNodeState> m_node_states GUARDED_BY(cs_main);
808 : :
809 : : /** Get a pointer to a const CNodeState, used when not mutating the CNodeState object. */
810 : : const CNodeState* State(NodeId pnode) const EXCLUSIVE_LOCKS_REQUIRED(cs_main);
811 : : /** Get a pointer to a mutable CNodeState. */
812 : : CNodeState* State(NodeId pnode) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
813 : :
814 : : uint32_t GetFetchFlags(const Peer& peer) const;
815 : :
816 : : std::atomic<std::chrono::microseconds> m_next_inv_to_inbounds{0us};
817 : :
818 : : /** Number of nodes with fSyncStarted. */
819 : : int nSyncStarted GUARDED_BY(cs_main) = 0;
820 : :
821 : : /** Hash of the last block we received via INV */
822 : : uint256 m_last_block_inv_triggering_headers_sync GUARDED_BY(g_msgproc_mutex){};
823 : :
824 : : /**
825 : : * Sources of received blocks, saved to be able punish them when processing
826 : : * happens afterwards.
827 : : * Set mapBlockSource[hash].second to false if the node should not be
828 : : * punished if the block is invalid.
829 : : */
830 : : std::map<uint256, std::pair<NodeId, bool>> mapBlockSource GUARDED_BY(cs_main);
831 : :
832 : : /** Number of peers with wtxid relay. */
833 : : std::atomic<int> m_wtxid_relay_peers{0};
834 : :
835 : : /** Number of outbound peers with m_chain_sync.m_protect. */
836 : : int m_outbound_peers_with_protect_from_disconnect GUARDED_BY(cs_main) = 0;
837 : :
838 : : /** Number of preferable block download peers. */
839 : : int m_num_preferred_download_peers GUARDED_BY(cs_main){0};
840 : :
841 : : /** Stalling timeout for blocks in IBD */
842 : : std::atomic<std::chrono::seconds> m_block_stalling_timeout{BLOCK_STALLING_TIMEOUT_DEFAULT};
843 : :
844 : : /**
845 : : * For sending `inv`s to inbound peers, we use a single (exponentially
846 : : * distributed) timer for all peers. If we used a separate timer for each
847 : : * peer, a spy node could make multiple inbound connections to us to
848 : : * accurately determine when we received the transaction (and potentially
849 : : * determine the transaction's origin). */
850 : : std::chrono::microseconds NextInvToInbounds(std::chrono::microseconds now,
851 : : std::chrono::seconds average_interval) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
852 : :
853 : :
854 : : // All of the following cache a recent block, and are protected by m_most_recent_block_mutex
855 : : Mutex m_most_recent_block_mutex;
856 : : std::shared_ptr<const CBlock> m_most_recent_block GUARDED_BY(m_most_recent_block_mutex);
857 : : std::shared_ptr<const CBlockHeaderAndShortTxIDs> m_most_recent_compact_block GUARDED_BY(m_most_recent_block_mutex);
858 : : uint256 m_most_recent_block_hash GUARDED_BY(m_most_recent_block_mutex);
859 : : std::unique_ptr<const std::map<uint256, CTransactionRef>> m_most_recent_block_txs GUARDED_BY(m_most_recent_block_mutex);
860 : :
861 : : // Data about the low-work headers synchronization, aggregated from all peers' HeadersSyncStates.
862 : : /** Mutex guarding the other m_headers_presync_* variables. */
863 : : Mutex m_headers_presync_mutex;
864 : : /** A type to represent statistics about a peer's low-work headers sync.
865 : : *
866 : : * - The first field is the total verified amount of work in that synchronization.
867 : : * - The second is:
868 : : * - nullopt: the sync is in REDOWNLOAD phase (phase 2).
869 : : * - {height, timestamp}: the sync has the specified tip height and block timestamp (phase 1).
870 : : */
871 : : using HeadersPresyncStats = std::pair<arith_uint256, std::optional<std::pair<int64_t, uint32_t>>>;
872 : : /** Statistics for all peers in low-work headers sync. */
873 : : std::map<NodeId, HeadersPresyncStats> m_headers_presync_stats GUARDED_BY(m_headers_presync_mutex) {};
874 : : /** The peer with the most-work entry in m_headers_presync_stats. */
875 : : NodeId m_headers_presync_bestpeer GUARDED_BY(m_headers_presync_mutex) {-1};
876 : : /** The m_headers_presync_stats improved, and needs signalling. */
877 : : std::atomic_bool m_headers_presync_should_signal{false};
878 : :
879 : : /** Height of the highest block announced using BIP 152 high-bandwidth mode. */
880 : : int m_highest_fast_announce GUARDED_BY(::cs_main){0};
881 : :
882 : : /** Have we requested this block from a peer */
883 : : bool IsBlockRequested(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
884 : :
885 : : /** Have we requested this block from an outbound peer */
886 : : bool IsBlockRequestedFromOutbound(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main, !m_peer_mutex);
887 : :
888 : : /** Remove this block from our tracked requested blocks. Called if:
889 : : * - the block has been received from a peer
890 : : * - the request for the block has timed out
891 : : * If "from_peer" is specified, then only remove the block if it is in
892 : : * flight from that peer (to avoid one peer's network traffic from
893 : : * affecting another's state).
894 : : */
895 : : void RemoveBlockRequest(const uint256& hash, std::optional<NodeId> from_peer) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
896 : :
897 : : /* Mark a block as in flight
898 : : * Returns false, still setting pit, if the block was already in flight from the same peer
899 : : * pit will only be valid as long as the same cs_main lock is being held
900 : : */
901 : : bool BlockRequested(NodeId nodeid, const CBlockIndex& block, std::list<QueuedBlock>::iterator** pit = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
902 : :
903 : : bool TipMayBeStale() EXCLUSIVE_LOCKS_REQUIRED(cs_main);
904 : :
905 : : /** Update pindexLastCommonBlock and add not-in-flight missing successors to vBlocks, until it has
906 : : * at most count entries.
907 : : */
908 : : void FindNextBlocksToDownload(const Peer& peer, unsigned int count, std::vector<const CBlockIndex*>& vBlocks, NodeId& nodeStaller) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
909 : :
910 : : /** Request blocks for the background chainstate, if one is in use. */
911 : : void TryDownloadingHistoricalBlocks(const Peer& peer, unsigned int count, std::vector<const CBlockIndex*>& vBlocks, const CBlockIndex* from_tip, const CBlockIndex* target_block) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
912 : :
913 : : /**
914 : : * \brief Find next blocks to download from a peer after a starting block.
915 : : *
916 : : * \param vBlocks Vector of blocks to download which will be appended to.
917 : : * \param peer Peer which blocks will be downloaded from.
918 : : * \param state Pointer to the state of the peer.
919 : : * \param pindexWalk Pointer to the starting block to add to vBlocks.
920 : : * \param count Maximum number of blocks to allow in vBlocks. No more
921 : : * blocks will be added if it reaches this size.
922 : : * \param nWindowEnd Maximum height of blocks to allow in vBlocks. No
923 : : * blocks will be added above this height.
924 : : * \param activeChain Optional pointer to a chain to compare against. If
925 : : * provided, any next blocks which are already contained
926 : : * in this chain will not be appended to vBlocks, but
927 : : * instead will be used to update the
928 : : * state->pindexLastCommonBlock pointer.
929 : : * \param nodeStaller Optional pointer to a NodeId variable that will receive
930 : : * the ID of another peer that might be causing this peer
931 : : * to stall. This is set to the ID of the peer which
932 : : * first requested the first in-flight block in the
933 : : * download window. It is only set if vBlocks is empty at
934 : : * the end of this function call and if increasing
935 : : * nWindowEnd by 1 would cause it to be non-empty (which
936 : : * indicates the download might be stalled because every
937 : : * block in the window is in flight and no other peer is
938 : : * trying to download the next block).
939 : : */
940 : : void FindNextBlocks(std::vector<const CBlockIndex*>& vBlocks, const Peer& peer, CNodeState *state, const CBlockIndex *pindexWalk, unsigned int count, int nWindowEnd, const CChain* activeChain=nullptr, NodeId* nodeStaller=nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
941 : :
942 : : /* Multimap used to preserve insertion order */
943 : : typedef std::multimap<uint256, std::pair<NodeId, std::list<QueuedBlock>::iterator>> BlockDownloadMap;
944 : : BlockDownloadMap mapBlocksInFlight GUARDED_BY(cs_main);
945 : :
946 : : /** When our tip was last updated. */
947 : : std::atomic<std::chrono::seconds> m_last_tip_update{0s};
948 : :
949 : : /** Determine whether or not a peer can request a transaction, and return it (or nullptr if not found or not allowed). */
950 : : CTransactionRef FindTxForGetData(const Peer::TxRelay& tx_relay, const GenTxid& gtxid)
951 : : EXCLUSIVE_LOCKS_REQUIRED(!m_most_recent_block_mutex, NetEventsInterface::g_msgproc_mutex);
952 : :
953 : : void ProcessGetData(CNode& pfrom, Peer& peer, const std::atomic<bool>& interruptMsgProc)
954 : : EXCLUSIVE_LOCKS_REQUIRED(!m_most_recent_block_mutex, peer.m_getdata_requests_mutex, NetEventsInterface::g_msgproc_mutex)
955 : : LOCKS_EXCLUDED(::cs_main);
956 : :
957 : : /** Process a new block. Perform any post-processing housekeeping */
958 : : void ProcessBlock(CNode& node, const std::shared_ptr<const CBlock>& block, bool force_processing, bool min_pow_checked);
959 : :
960 : : /** Process compact block txns */
961 : : void ProcessCompactBlockTxns(CNode& pfrom, Peer& peer, const BlockTransactions& block_transactions)
962 : : EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex, !m_most_recent_block_mutex);
963 : :
964 : : /**
965 : : * When a peer sends us a valid block, instruct it to announce blocks to us
966 : : * using CMPCTBLOCK if possible by adding its nodeid to the end of
967 : : * lNodesAnnouncingHeaderAndIDs, and keeping that list under a certain size by
968 : : * removing the first element if necessary.
969 : : */
970 : : void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid) EXCLUSIVE_LOCKS_REQUIRED(cs_main, !m_peer_mutex);
971 : :
972 : : /** Stack of nodes which we have set to announce using compact blocks */
973 : : std::list<NodeId> lNodesAnnouncingHeaderAndIDs GUARDED_BY(cs_main);
974 : :
975 : : /** Number of peers from which we're downloading blocks. */
976 : : int m_peers_downloading_from GUARDED_BY(cs_main) = 0;
977 : :
978 : : void AddToCompactExtraTransactions(const CTransactionRef& tx) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
979 : :
980 : : /** Orphan/conflicted/etc transactions that are kept for compact block reconstruction.
981 : : * The last -blockreconstructionextratxn/DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN of
982 : : * these are kept in a ring buffer */
983 : : std::vector<CTransactionRef> vExtraTxnForCompact GUARDED_BY(g_msgproc_mutex);
984 : : /** Offset into vExtraTxnForCompact to insert the next tx */
985 : : size_t vExtraTxnForCompactIt GUARDED_BY(g_msgproc_mutex) = 0;
986 : :
987 : : /** Check whether the last unknown block a peer advertised is not yet known. */
988 : : void ProcessBlockAvailability(NodeId nodeid) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
989 : : /** Update tracking information about which blocks a peer is assumed to have. */
990 : : void UpdateBlockAvailability(NodeId nodeid, const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
991 : : bool CanDirectFetch() EXCLUSIVE_LOCKS_REQUIRED(cs_main);
992 : :
993 : : /**
994 : : * Estimates the distance, in blocks, between the best-known block and the network chain tip.
995 : : * Utilizes the best-block time and the chainparams blocks spacing to approximate it.
996 : : */
997 : : int64_t ApproximateBestBlockDepth() const;
998 : :
999 : : /**
1000 : : * To prevent fingerprinting attacks, only send blocks/headers outside of
1001 : : * the active chain if they are no more than a month older (both in time,
1002 : : * and in best equivalent proof of work) than the best header chain we know
1003 : : * about and we fully-validated them at some point.
1004 : : */
1005 : : bool BlockRequestAllowed(const CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
1006 : : bool AlreadyHaveBlock(const uint256& block_hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
1007 : : void ProcessGetBlockData(CNode& pfrom, Peer& peer, const CInv& inv)
1008 : : EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex, !m_most_recent_block_mutex);
1009 : :
1010 : : /**
1011 : : * Validation logic for compact filters request handling.
1012 : : *
1013 : : * May disconnect from the peer in the case of a bad request.
1014 : : *
1015 : : * @param[in] node The node that we received the request from
1016 : : * @param[in] peer The peer that we received the request from
1017 : : * @param[in] filter_type The filter type the request is for. Must be basic filters.
1018 : : * @param[in] start_height The start height for the request
1019 : : * @param[in] stop_hash The stop_hash for the request
1020 : : * @param[in] max_height_diff The maximum number of items permitted to request, as specified in BIP 157
1021 : : * @param[out] stop_index The CBlockIndex for the stop_hash block, if the request can be serviced.
1022 : : * @param[out] filter_index The filter index, if the request can be serviced.
1023 : : * @return True if the request can be serviced.
1024 : : */
1025 : : bool PrepareBlockFilterRequest(CNode& node, Peer& peer,
1026 : : BlockFilterType filter_type, uint32_t start_height,
1027 : : const uint256& stop_hash, uint32_t max_height_diff,
1028 : : const CBlockIndex*& stop_index,
1029 : : BlockFilterIndex*& filter_index);
1030 : :
1031 : : /**
1032 : : * Handle a cfilters request.
1033 : : *
1034 : : * May disconnect from the peer in the case of a bad request.
1035 : : *
1036 : : * @param[in] node The node that we received the request from
1037 : : * @param[in] peer The peer that we received the request from
1038 : : * @param[in] vRecv The raw message received
1039 : : */
1040 : : void ProcessGetCFilters(CNode& node, Peer& peer, DataStream& vRecv);
1041 : :
1042 : : /**
1043 : : * Handle a cfheaders request.
1044 : : *
1045 : : * May disconnect from the peer in the case of a bad request.
1046 : : *
1047 : : * @param[in] node The node that we received the request from
1048 : : * @param[in] peer The peer that we received the request from
1049 : : * @param[in] vRecv The raw message received
1050 : : */
1051 : : void ProcessGetCFHeaders(CNode& node, Peer& peer, DataStream& vRecv);
1052 : :
1053 : : /**
1054 : : * Handle a getcfcheckpt request.
1055 : : *
1056 : : * May disconnect from the peer in the case of a bad request.
1057 : : *
1058 : : * @param[in] node The node that we received the request from
1059 : : * @param[in] peer The peer that we received the request from
1060 : : * @param[in] vRecv The raw message received
1061 : : */
1062 : : void ProcessGetCFCheckPt(CNode& node, Peer& peer, DataStream& vRecv);
1063 : :
1064 : : /** Checks if address relay is permitted with peer. If needed, initializes
1065 : : * the m_addr_known bloom filter and sets m_addr_relay_enabled to true.
1066 : : *
1067 : : * @return True if address relay is enabled with peer
1068 : : * False if address relay is disallowed
1069 : : */
1070 : : bool SetupAddressRelay(const CNode& node, Peer& peer) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
1071 : :
1072 : : void AddAddressKnown(Peer& peer, const CAddress& addr) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
1073 : : void PushAddress(Peer& peer, const CAddress& addr) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
1074 : :
1075 : : void LogBlockHeader(const CBlockIndex& index, const CNode& peer, bool via_compact_block);
1076 : : };
1077 : :
1078 : 2399255 : const CNodeState* PeerManagerImpl::State(NodeId pnode) const
1079 : : {
1080 : 2399255 : std::map<NodeId, CNodeState>::const_iterator it = m_node_states.find(pnode);
1081 [ + + ]: 2399255 : if (it == m_node_states.end())
1082 : : return nullptr;
1083 : 2398957 : return &it->second;
1084 : : }
1085 : :
1086 : 2388786 : CNodeState* PeerManagerImpl::State(NodeId pnode)
1087 : : {
1088 : 2388786 : return const_cast<CNodeState*>(std::as_const(*this).State(pnode));
1089 : : }
1090 : :
1091 : : /**
1092 : : * Whether the peer supports the address. For example, a peer that does not
1093 : : * implement BIP155 cannot receive Tor v3 addresses because it requires
1094 : : * ADDRv2 (BIP155) encoding.
1095 : : */
1096 : 19501 : static bool IsAddrCompatible(const Peer& peer, const CAddress& addr)
1097 : : {
1098 [ + + + - ]: 19501 : return peer.m_wants_addrv2 || addr.IsAddrV1Compatible();
1099 : : }
1100 : :
1101 : 1279 : void PeerManagerImpl::AddAddressKnown(Peer& peer, const CAddress& addr)
1102 : : {
1103 [ - + ]: 1279 : assert(peer.m_addr_known);
1104 [ + - ]: 1279 : peer.m_addr_known->insert(addr.GetKey());
1105 : 1279 : }
1106 : :
1107 : 19004 : void PeerManagerImpl::PushAddress(Peer& peer, const CAddress& addr)
1108 : : {
1109 : : // Known checking here is only to save space from duplicates.
1110 : : // Before sending, we'll filter it again for known addresses that were
1111 : : // added after addresses were pushed.
1112 [ - + ]: 19004 : assert(peer.m_addr_known);
1113 [ + - + - : 38008 : if (addr.IsValid() && !peer.m_addr_known->contains(addr.GetKey()) && IsAddrCompatible(peer, addr)) {
+ + + - +
- + + ]
1114 [ - + ]: 18989 : if (peer.m_addrs_to_send.size() >= MAX_ADDR_TO_SEND) {
1115 : 0 : peer.m_addrs_to_send[m_rng.randrange(peer.m_addrs_to_send.size())] = addr;
1116 : : } else {
1117 : 18989 : peer.m_addrs_to_send.push_back(addr);
1118 : : }
1119 : : }
1120 : 19004 : }
1121 : :
1122 : 38129 : static void AddKnownTx(Peer& peer, const uint256& hash)
1123 : : {
1124 : 38129 : auto tx_relay = peer.GetTxRelay();
1125 [ + - ]: 38129 : if (!tx_relay) return;
1126 : :
1127 : 38129 : LOCK(tx_relay->m_tx_inventory_mutex);
1128 [ + - ]: 38129 : tx_relay->m_tx_inventory_known_filter.insert(hash);
1129 : 38129 : }
1130 : :
1131 : : /** Whether this peer can serve us blocks. */
1132 : 519153 : static bool CanServeBlocks(const Peer& peer)
1133 : : {
1134 : 519153 : return peer.m_their_services & (NODE_NETWORK|NODE_NETWORK_LIMITED);
1135 : : }
1136 : :
1137 : : /** Whether this peer can only serve limited recent blocks (e.g. because
1138 : : * it prunes old blocks) */
1139 : 433220 : static bool IsLimitedPeer(const Peer& peer)
1140 : : {
1141 [ + + - + ]: 433220 : return (!(peer.m_their_services & NODE_NETWORK) &&
1142 [ - + ]: 28490 : (peer.m_their_services & NODE_NETWORK_LIMITED));
1143 : : }
1144 : :
1145 : : /** Whether this peer can serve us witness data */
1146 : 2344999 : static bool CanServeWitnesses(const Peer& peer)
1147 : : {
1148 : 2344999 : return peer.m_their_services & NODE_WITNESS;
1149 : : }
1150 : :
1151 : 3351 : std::chrono::microseconds PeerManagerImpl::NextInvToInbounds(std::chrono::microseconds now,
1152 : : std::chrono::seconds average_interval)
1153 : : {
1154 [ + + ]: 3351 : if (m_next_inv_to_inbounds.load() < now) {
1155 : : // If this function were called from multiple threads simultaneously
1156 : : // it would possible that both update the next send variable, and return a different result to their caller.
1157 : : // This is not possible in practice as only the net processing thread invokes this function.
1158 : 1626 : m_next_inv_to_inbounds = now + m_rng.rand_exp_duration(average_interval);
1159 : : }
1160 : 3351 : return m_next_inv_to_inbounds;
1161 : : }
1162 : :
1163 : 786395 : bool PeerManagerImpl::IsBlockRequested(const uint256& hash)
1164 : : {
1165 : 786395 : return mapBlocksInFlight.count(hash);
1166 : : }
1167 : :
1168 : 7 : bool PeerManagerImpl::IsBlockRequestedFromOutbound(const uint256& hash)
1169 : : {
1170 [ + + ]: 22 : for (auto range = mapBlocksInFlight.equal_range(hash); range.first != range.second; range.first++) {
1171 : 16 : auto [nodeid, block_it] = range.first->second;
1172 : 16 : PeerRef peer{GetPeerRef(nodeid)};
1173 [ + - + + : 16 : if (peer && !peer->m_is_inbound) return true;
+ - ]
1174 : 16 : }
1175 : :
1176 : : return false;
1177 : : }
1178 : :
1179 : 172516 : void PeerManagerImpl::RemoveBlockRequest(const uint256& hash, std::optional<NodeId> from_peer)
1180 : : {
1181 : 172516 : auto range = mapBlocksInFlight.equal_range(hash);
1182 [ + + ]: 172516 : if (range.first == range.second) {
1183 : : // Block was not requested from any peer
1184 : : return;
1185 : : }
1186 : :
1187 : : // We should not have requested too many of this block
1188 : 58040 : Assume(mapBlocksInFlight.count(hash) <= MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK);
1189 : :
1190 [ + + ]: 116565 : while (range.first != range.second) {
1191 [ + + ]: 58525 : const auto& [node_id, list_it]{range.first->second};
1192 : :
1193 [ + + + + ]: 58525 : if (from_peer && *from_peer != node_id) {
1194 : 956 : range.first++;
1195 : 956 : continue;
1196 : : }
1197 : :
1198 : 57569 : CNodeState& state = *Assert(State(node_id));
1199 : :
1200 [ + + ]: 57569 : if (state.vBlocksInFlight.begin() == list_it) {
1201 : : // First block on the queue was received, update the start download time for the next one
1202 : 56466 : state.m_downloading_since = std::max(state.m_downloading_since, GetTime<std::chrono::microseconds>());
1203 : : }
1204 : 57569 : state.vBlocksInFlight.erase(list_it);
1205 : :
1206 [ + + ]: 57569 : if (state.vBlocksInFlight.empty()) {
1207 : : // Last validated block on the queue for this peer was received.
1208 : 18388 : m_peers_downloading_from--;
1209 : : }
1210 : 57569 : state.m_stalling_since = 0us;
1211 : :
1212 : 57569 : range.first = mapBlocksInFlight.erase(range.first);
1213 : : }
1214 : : }
1215 : :
1216 : 57920 : bool PeerManagerImpl::BlockRequested(NodeId nodeid, const CBlockIndex& block, std::list<QueuedBlock>::iterator** pit)
1217 : : {
1218 : 57920 : const uint256& hash{block.GetBlockHash()};
1219 : :
1220 : 57920 : CNodeState *state = State(nodeid);
1221 [ - + ]: 57920 : assert(state != nullptr);
1222 : :
1223 : 57920 : Assume(mapBlocksInFlight.count(hash) <= MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK);
1224 : :
1225 : : // Short-circuit most stuff in case it is from the same node
1226 [ + + ]: 58399 : for (auto range = mapBlocksInFlight.equal_range(hash); range.first != range.second; range.first++) {
1227 [ + + ]: 721 : if (range.first->second.first == nodeid) {
1228 [ + - ]: 242 : if (pit) {
1229 : 242 : *pit = &range.first->second.second;
1230 : : }
1231 : 242 : return false;
1232 : : }
1233 : : }
1234 : :
1235 : : // Make sure it's not being fetched already from same peer.
1236 : 57678 : RemoveBlockRequest(hash, nodeid);
1237 : :
1238 : 57678 : std::list<QueuedBlock>::iterator it = state->vBlocksInFlight.insert(state->vBlocksInFlight.end(),
1239 : 16195 : {&block, std::unique_ptr<PartiallyDownloadedBlock>(pit ? new PartiallyDownloadedBlock(&m_mempool) : nullptr)});
1240 [ + + ]: 57678 : if (state->vBlocksInFlight.size() == 1) {
1241 : : // We're starting a block download (batch) from this peer.
1242 : 18412 : state->m_downloading_since = GetTime<std::chrono::microseconds>();
1243 : 18412 : m_peers_downloading_from++;
1244 : : }
1245 : 57678 : auto itInFlight = mapBlocksInFlight.insert(std::make_pair(hash, std::make_pair(nodeid, it)));
1246 [ + + ]: 57678 : if (pit) {
1247 : 16195 : *pit = &itInFlight->second.second;
1248 : : }
1249 : : return true;
1250 [ + + + - ]: 73873 : }
1251 : :
1252 : 19092 : void PeerManagerImpl::MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid)
1253 : : {
1254 : 19092 : AssertLockHeld(cs_main);
1255 : :
1256 : : // When in -blocksonly mode, never request high-bandwidth mode from peers. Our
1257 : : // mempool will not contain the transactions necessary to reconstruct the
1258 : : // compact block.
1259 [ + + ]: 19092 : if (m_opts.ignore_incoming_txs) return;
1260 : :
1261 : 19091 : CNodeState* nodestate = State(nodeid);
1262 : 19091 : PeerRef peer{GetPeerRef(nodeid)};
1263 [ + + + + ]: 19091 : if (!nodestate || !nodestate->m_provides_cmpctblocks) {
1264 : : // Don't request compact blocks if the peer has not signalled support
1265 : : return;
1266 : : }
1267 : :
1268 : 17227 : int num_outbound_hb_peers = 0;
1269 [ + + ]: 23195 : for (std::list<NodeId>::iterator it = lNodesAnnouncingHeaderAndIDs.begin(); it != lNodesAnnouncingHeaderAndIDs.end(); it++) {
1270 [ + + ]: 22857 : if (*it == nodeid) {
1271 : 16889 : lNodesAnnouncingHeaderAndIDs.erase(it);
1272 [ + - ]: 16889 : lNodesAnnouncingHeaderAndIDs.push_back(nodeid);
1273 : : return;
1274 : : }
1275 [ + - ]: 5968 : PeerRef peer_ref{GetPeerRef(*it)};
1276 [ + + + + ]: 5968 : if (peer_ref && !peer_ref->m_is_inbound) ++num_outbound_hb_peers;
1277 : 5968 : }
1278 [ + - + + ]: 338 : if (peer && peer->m_is_inbound) {
1279 : : // If we're adding an inbound HB peer, make sure we're not removing
1280 : : // our last outbound HB peer in the process.
1281 [ + + + + ]: 168 : if (lNodesAnnouncingHeaderAndIDs.size() >= 3 && num_outbound_hb_peers == 1) {
1282 [ + - ]: 7 : PeerRef remove_peer{GetPeerRef(lNodesAnnouncingHeaderAndIDs.front())};
1283 [ + - + + ]: 7 : if (remove_peer && !remove_peer->m_is_inbound) {
1284 : : // Put the HB outbound peer in the second slot, so that it
1285 : : // doesn't get removed.
1286 : 4 : std::swap(lNodesAnnouncingHeaderAndIDs.front(), *std::next(lNodesAnnouncingHeaderAndIDs.begin()));
1287 : : }
1288 : 7 : }
1289 : : }
1290 [ + - + - ]: 676 : m_connman.ForNode(nodeid, [this](CNode* pfrom) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
1291 : 338 : AssertLockHeld(::cs_main);
1292 [ + + ]: 338 : if (lNodesAnnouncingHeaderAndIDs.size() >= 3) {
1293 : : // As per BIP152, we only get 3 of our peers to announce
1294 : : // blocks using compact encodings.
1295 [ + - ]: 56 : m_connman.ForNode(lNodesAnnouncingHeaderAndIDs.front(), [this](CNode* pnodeStop){
1296 [ + - ]: 10 : MakeAndPushMessage(*pnodeStop, NetMsgType::SENDCMPCT, /*high_bandwidth=*/false, /*version=*/CMPCTBLOCKS_VERSION);
1297 : : // save BIP152 bandwidth state: we select peer to be low-bandwidth
1298 : 10 : pnodeStop->m_bip152_highbandwidth_to = false;
1299 : 10 : return true;
1300 : : });
1301 : 56 : lNodesAnnouncingHeaderAndIDs.pop_front();
1302 : : }
1303 [ + - ]: 338 : MakeAndPushMessage(*pfrom, NetMsgType::SENDCMPCT, /*high_bandwidth=*/true, /*version=*/CMPCTBLOCKS_VERSION);
1304 : : // save BIP152 bandwidth state: we select peer to be high-bandwidth
1305 : 338 : pfrom->m_bip152_highbandwidth_to = true;
1306 : 338 : lNodesAnnouncingHeaderAndIDs.push_back(pfrom->GetId());
1307 : 338 : return true;
1308 : : });
1309 : 19091 : }
1310 : :
1311 : 3 : bool PeerManagerImpl::TipMayBeStale()
1312 : : {
1313 : 3 : AssertLockHeld(cs_main);
1314 : 3 : const Consensus::Params& consensusParams = m_chainparams.GetConsensus();
1315 [ + + ]: 3 : if (m_last_tip_update.load() == 0s) {
1316 : 2 : m_last_tip_update = GetTime<std::chrono::seconds>();
1317 : : }
1318 [ + + - + ]: 3 : return m_last_tip_update.load() < GetTime<std::chrono::seconds>() - std::chrono::seconds{consensusParams.nPowTargetSpacing * 3} && mapBlocksInFlight.empty();
1319 : : }
1320 : :
1321 : 879 : int64_t PeerManagerImpl::ApproximateBestBlockDepth() const
1322 : : {
1323 : 879 : return (GetTime<std::chrono::seconds>() - m_best_block_time.load()).count() / m_chainparams.GetConsensus().nPowTargetSpacing;
1324 : : }
1325 : :
1326 : 66806 : bool PeerManagerImpl::CanDirectFetch()
1327 : : {
1328 [ + - ]: 133612 : return m_chainman.ActiveChain().Tip()->Time() > NodeClock::now() - m_chainparams.GetConsensus().PowTargetSpacing() * 20;
1329 : : }
1330 : :
1331 : 129114 : static bool PeerHasHeader(CNodeState *state, const CBlockIndex *pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
1332 : : {
1333 [ + + + + ]: 129114 : if (state->pindexBestKnownBlock && pindex == state->pindexBestKnownBlock->GetAncestor(pindex->nHeight))
1334 : : return true;
1335 [ + + + + ]: 85067 : if (state->pindexBestHeaderSent && pindex == state->pindexBestHeaderSent->GetAncestor(pindex->nHeight))
1336 : 46245 : return true;
1337 : : return false;
1338 : : }
1339 : :
1340 : 853283 : void PeerManagerImpl::ProcessBlockAvailability(NodeId nodeid) {
1341 : 853283 : CNodeState *state = State(nodeid);
1342 [ - + ]: 853283 : assert(state != nullptr);
1343 : :
1344 [ + + ]: 853283 : if (!state->hashLastUnknownBlock.IsNull()) {
1345 : 8278 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(state->hashLastUnknownBlock);
1346 [ + + + - ]: 8703 : if (pindex && pindex->nChainWork > 0) {
1347 [ + + + + ]: 425 : if (state->pindexBestKnownBlock == nullptr || pindex->nChainWork >= state->pindexBestKnownBlock->nChainWork) {
1348 : 424 : state->pindexBestKnownBlock = pindex;
1349 : : }
1350 : 425 : state->hashLastUnknownBlock.SetNull();
1351 : : }
1352 : : }
1353 : 853283 : }
1354 : :
1355 : 32949 : void PeerManagerImpl::UpdateBlockAvailability(NodeId nodeid, const uint256 &hash) {
1356 : 32949 : CNodeState *state = State(nodeid);
1357 [ - + ]: 32949 : assert(state != nullptr);
1358 : :
1359 : 32949 : ProcessBlockAvailability(nodeid);
1360 : :
1361 : 32949 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(hash);
1362 [ + + + - ]: 64963 : if (pindex && pindex->nChainWork > 0) {
1363 : : // An actually better block was announced.
1364 [ + + + + ]: 32014 : if (state->pindexBestKnownBlock == nullptr || pindex->nChainWork >= state->pindexBestKnownBlock->nChainWork) {
1365 : 31254 : state->pindexBestKnownBlock = pindex;
1366 : : }
1367 : : } else {
1368 : : // An unknown block was announced; just assume that the latest one is the best one.
1369 : 935 : state->hashLastUnknownBlock = hash;
1370 : : }
1371 : 32949 : }
1372 : :
1373 : : // Logic for calculating which blocks to download from a given peer, given our current tip.
1374 : 365239 : void PeerManagerImpl::FindNextBlocksToDownload(const Peer& peer, unsigned int count, std::vector<const CBlockIndex*>& vBlocks, NodeId& nodeStaller)
1375 : : {
1376 [ + - ]: 365239 : if (count == 0)
1377 : : return;
1378 : :
1379 : 365239 : vBlocks.reserve(vBlocks.size() + count);
1380 : 365239 : CNodeState *state = State(peer.m_id);
1381 [ - + ]: 365239 : assert(state != nullptr);
1382 : :
1383 : : // Make sure pindexBestKnownBlock is up to date, we'll need it.
1384 : 365239 : ProcessBlockAvailability(peer.m_id);
1385 : :
1386 [ + + + - : 613218 : if (state->pindexBestKnownBlock == nullptr || state->pindexBestKnownBlock->nChainWork < m_chainman.ActiveChain().Tip()->nChainWork || state->pindexBestKnownBlock->nChainWork < m_chainman.MinimumChainWork()) {
+ + + + ]
1387 : : // This peer has nothing interesting.
1388 : 216698 : return;
1389 : : }
1390 : :
1391 : : // When we sync with AssumeUtxo and discover the snapshot is not in the peer's best chain, abort:
1392 : : // We can't reorg to this chain due to missing undo data until the background sync has finished,
1393 : : // so downloading blocks from it would be futile.
1394 : 148541 : const CBlockIndex* snap_base{m_chainman.GetSnapshotBaseBlock()};
1395 [ + + + - ]: 148541 : if (snap_base && state->pindexBestKnownBlock->GetAncestor(snap_base->nHeight) != snap_base) {
1396 [ # # ]: 0 : LogDebug(BCLog::NET, "Not downloading blocks from peer=%d, which doesn't have the snapshot block in its best chain.\n", peer.m_id);
1397 : 0 : return;
1398 : : }
1399 : :
1400 : : // Bootstrap quickly by guessing a parent of our best tip is the forking point.
1401 : : // Guessing wrong in either direction is not a problem.
1402 : : // Also reset pindexLastCommonBlock after a snapshot was loaded, so that blocks after the snapshot will be prioritised for download.
1403 [ + + + + ]: 148541 : if (state->pindexLastCommonBlock == nullptr ||
1404 [ - + ]: 1874 : (snap_base && state->pindexLastCommonBlock->nHeight < snap_base->nHeight)) {
1405 [ + + + - ]: 1972 : state->pindexLastCommonBlock = m_chainman.ActiveChain()[std::min(state->pindexBestKnownBlock->nHeight, m_chainman.ActiveChain().Height())];
1406 : : }
1407 : :
1408 : : // If the peer reorganized, our previous pindexLastCommonBlock may not be an ancestor
1409 : : // of its current tip anymore. Go back enough to fix that.
1410 : 148541 : state->pindexLastCommonBlock = LastCommonAncestor(state->pindexLastCommonBlock, state->pindexBestKnownBlock);
1411 [ + + ]: 148541 : if (state->pindexLastCommonBlock == state->pindexBestKnownBlock)
1412 : : return;
1413 : :
1414 : 64530 : const CBlockIndex *pindexWalk = state->pindexLastCommonBlock;
1415 : : // Never fetch further than the best block we know the peer has, or more than BLOCK_DOWNLOAD_WINDOW + 1 beyond the last
1416 : : // linked block we have in common with this peer. The +1 is so we can detect stalling, namely if we would be able to
1417 : : // download that next block if the window were 1 larger.
1418 : 64530 : int nWindowEnd = state->pindexLastCommonBlock->nHeight + BLOCK_DOWNLOAD_WINDOW;
1419 : :
1420 : 64530 : FindNextBlocks(vBlocks, peer, state, pindexWalk, count, nWindowEnd, &m_chainman.ActiveChain(), &nodeStaller);
1421 : : }
1422 : :
1423 : 1492 : void PeerManagerImpl::TryDownloadingHistoricalBlocks(const Peer& peer, unsigned int count, std::vector<const CBlockIndex*>& vBlocks, const CBlockIndex *from_tip, const CBlockIndex* target_block)
1424 : : {
1425 : 1492 : Assert(from_tip);
1426 : 1492 : Assert(target_block);
1427 : :
1428 [ + + ]: 1492 : if (vBlocks.size() >= count) {
1429 : : return;
1430 : : }
1431 : :
1432 : 982 : vBlocks.reserve(count);
1433 : 982 : CNodeState *state = Assert(State(peer.m_id));
1434 : :
1435 [ + + - + ]: 982 : if (state->pindexBestKnownBlock == nullptr || state->pindexBestKnownBlock->GetAncestor(target_block->nHeight) != target_block) {
1436 : : // This peer can't provide us the complete series of blocks leading up to the
1437 : : // assumeutxo snapshot base.
1438 : : //
1439 : : // Presumably this peer's chain has less work than our ActiveChain()'s tip, or else we
1440 : : // will eventually crash when we try to reorg to it. Let other logic
1441 : : // deal with whether we disconnect this peer.
1442 : : //
1443 : : // TODO at some point in the future, we might choose to request what blocks
1444 : : // this peer does have from the historical chain, despite it not having a
1445 : : // complete history beneath the snapshot base.
1446 : 94 : return;
1447 : : }
1448 : :
1449 [ - + ]: 888 : FindNextBlocks(vBlocks, peer, state, from_tip, count, std::min<int>(from_tip->nHeight + BLOCK_DOWNLOAD_WINDOW, target_block->nHeight));
1450 : : }
1451 : :
1452 : 65418 : void PeerManagerImpl::FindNextBlocks(std::vector<const CBlockIndex*>& vBlocks, const Peer& peer, CNodeState *state, const CBlockIndex *pindexWalk, unsigned int count, int nWindowEnd, const CChain* activeChain, NodeId* nodeStaller)
1453 : : {
1454 : 65418 : std::vector<const CBlockIndex*> vToFetch;
1455 [ + + ]: 65418 : int nMaxHeight = std::min<int>(state->pindexBestKnownBlock->nHeight, nWindowEnd + 1);
1456 : 65418 : bool is_limited_peer = IsLimitedPeer(peer);
1457 : 65418 : NodeId waitingfor = -1;
1458 [ + + ]: 171230 : while (pindexWalk->nHeight < nMaxHeight) {
1459 : : // Read up to 128 (or more, if more blocks than that are needed) successors of pindexWalk (towards
1460 : : // pindexBestKnownBlock) into vToFetch. We fetch 128, because CBlockIndex::GetAncestor may be as expensive
1461 : : // as iterating over ~100 CBlockIndex* entries anyway.
1462 [ + - + + ]: 152880 : int nToFetch = std::min(nMaxHeight - pindexWalk->nHeight, std::max<int>(count - vBlocks.size(), 128));
1463 [ + - ]: 76440 : vToFetch.resize(nToFetch);
1464 [ + - ]: 76440 : pindexWalk = state->pindexBestKnownBlock->GetAncestor(pindexWalk->nHeight + nToFetch);
1465 : 76440 : vToFetch[nToFetch - 1] = pindexWalk;
1466 [ + + ]: 5687968 : for (unsigned int i = nToFetch - 1; i > 0; i--) {
1467 : 5611528 : vToFetch[i - 1] = vToFetch[i]->pprev;
1468 : : }
1469 : :
1470 : : // Iterate over those blocks in vToFetch (in forward direction), adding the ones that
1471 : : // are not yet downloaded and not in flight to vBlocks. In the meantime, update
1472 : : // pindexLastCommonBlock as long as all ancestors are already downloaded, or if it's
1473 : : // already part of our chain (and therefore don't need it even if pruned).
1474 [ + + ]: 2289541 : for (const CBlockIndex* pindex : vToFetch) {
1475 [ + + + - ]: 2284845 : if (!pindex->IsValid(BLOCK_VALID_TREE)) {
1476 : : // We consider the chain that this peer is on invalid.
1477 : : return;
1478 : : }
1479 : :
1480 [ + + - + ]: 2248799 : if (!CanServeWitnesses(peer) && DeploymentActiveAt(*pindex, m_chainman, Consensus::DEPLOYMENT_SEGWIT)) {
1481 : : // We wouldn't download this block or its descendants from this peer.
1482 : : return;
1483 : : }
1484 : :
1485 [ + + + + : 2248642 : if (pindex->nStatus & BLOCK_HAVE_DATA || (activeChain && activeChain->Contains(pindex))) {
- + ]
1486 [ + + + + ]: 1572165 : if (activeChain && pindex->HaveNumChainTxs()) {
1487 : 67418 : state->pindexLastCommonBlock = pindex;
1488 : : }
1489 : 1572165 : continue;
1490 : : }
1491 : :
1492 : : // Is block in-flight?
1493 [ + + ]: 676477 : if (IsBlockRequested(pindex->GetBlockHash())) {
1494 [ + + ]: 629887 : if (waitingfor == -1) {
1495 : : // This is the first already-in-flight block.
1496 : 44264 : waitingfor = mapBlocksInFlight.lower_bound(pindex->GetBlockHash())->second.first;
1497 : : }
1498 : 629887 : continue;
1499 : : }
1500 : :
1501 : : // The block is not already downloaded, and not yet in flight.
1502 [ + + ]: 46590 : if (pindex->nHeight > nWindowEnd) {
1503 : : // We reached the end of the window.
1504 [ + + + + ]: 205 : if (vBlocks.size() == 0 && waitingfor != peer.m_id) {
1505 : : // We aren't able to fetch anything, but we would be if the download window was one larger.
1506 [ + - ]: 137 : if (nodeStaller) *nodeStaller = waitingfor;
1507 : : }
1508 : 205 : return;
1509 : : }
1510 : :
1511 : : // Don't request blocks that go further than what limited peers can provide
1512 [ + + + + ]: 46385 : if (is_limited_peer && (state->pindexBestKnownBlock->nHeight - pindex->nHeight >= static_cast<int>(NODE_NETWORK_LIMITED_MIN_BLOCKS) - 2 /* two blocks buffer for possible races */)) {
1513 : 8484 : continue;
1514 : : }
1515 : :
1516 [ + - ]: 37901 : vBlocks.push_back(pindex);
1517 [ + + ]: 37901 : if (vBlocks.size() == count) {
1518 : : return;
1519 : : }
1520 : : }
1521 : : }
1522 : 65418 : }
1523 : :
1524 : : } // namespace
1525 : :
1526 : 1524 : void PeerManagerImpl::PushNodeVersion(CNode& pnode, const Peer& peer)
1527 : : {
1528 : 1524 : uint64_t my_services{peer.m_our_services};
1529 : 1524 : const int64_t nTime{count_seconds(GetTime<std::chrono::seconds>())};
1530 : 1524 : uint64_t nonce = pnode.GetLocalNonce();
1531 : 1524 : const int nNodeStartingHeight{m_best_height};
1532 : 1524 : NodeId nodeid = pnode.GetId();
1533 : 1524 : CAddress addr = pnode.addr;
1534 : :
1535 [ + - + + : 1530 : CService addr_you = addr.IsRoutable() && !IsProxy(addr) && addr.IsAddrV1Compatible() ? addr : CService();
+ - + - +
- + + +
- ]
1536 : 1524 : uint64_t your_services{addr.nServices};
1537 : :
1538 : 1524 : const bool tx_relay{!RejectIncomingTxs(pnode)};
1539 [ + - + - ]: 3048 : MakeAndPushMessage(pnode, NetMsgType::VERSION, PROTOCOL_VERSION, my_services, nTime,
1540 : 1524 : your_services, CNetAddr::V1(addr_you), // Together the pre-version-31402 serialization of CAddress "addrYou" (without nTime)
1541 [ + - + - ]: 1524 : my_services, CNetAddr::V1(CService{}), // Together the pre-version-31402 serialization of CAddress "addrMe" (without nTime)
1542 : : nonce, strSubVersion, nNodeStartingHeight, tx_relay);
1543 : :
1544 [ + + ]: 1524 : if (fLogIPs) {
1545 [ + - + - : 4 : LogDebug(BCLog::NET, "send version message: version %d, blocks=%d, them=%s, txrelay=%d, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, addr_you.ToStringAddrPort(), tx_relay, nodeid);
+ - + - ]
1546 : : } else {
1547 [ + - + - : 1524 : LogDebug(BCLog::NET, "send version message: version %d, blocks=%d, txrelay=%d, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, tx_relay, nodeid);
+ - ]
1548 : : }
1549 : 1524 : }
1550 : :
1551 : 1 : void PeerManagerImpl::UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds)
1552 : : {
1553 : 1 : LOCK(cs_main);
1554 : 1 : CNodeState *state = State(node);
1555 [ + - ]: 1 : if (state) state->m_last_block_announcement = time_in_seconds;
1556 : 1 : }
1557 : :
1558 : 1573 : void PeerManagerImpl::InitializeNode(const CNode& node, ServiceFlags our_services)
1559 : : {
1560 : 1573 : NodeId nodeid = node.GetId();
1561 : 1573 : {
1562 : 1573 : LOCK(cs_main); // For m_node_states
1563 [ + - ]: 1573 : m_node_states.try_emplace(m_node_states.end(), nodeid);
1564 : 0 : }
1565 [ + - ]: 4719 : WITH_LOCK(m_tx_download_mutex, m_txdownloadman.CheckIsEmpty(nodeid));
1566 : :
1567 [ + + ]: 1573 : if (NetPermissions::HasFlag(node.m_permission_flags, NetPermissionFlags::BloomFilter)) {
1568 : 4 : our_services = static_cast<ServiceFlags>(our_services | NODE_BLOOM);
1569 : : }
1570 : :
1571 : 1573 : PeerRef peer = std::make_shared<Peer>(nodeid, our_services, node.IsInboundConn());
1572 : 1573 : {
1573 [ + - ]: 1573 : LOCK(m_peer_mutex);
1574 [ + - + - ]: 1573 : m_peer_map.emplace_hint(m_peer_map.end(), nodeid, peer);
1575 [ + - ]: 1573 : }
1576 : 1573 : }
1577 : :
1578 : 12 : void PeerManagerImpl::ReattemptInitialBroadcast(CScheduler& scheduler)
1579 : : {
1580 : 12 : std::set<uint256> unbroadcast_txids = m_mempool.GetUnbroadcastTxs();
1581 : :
1582 [ + + ]: 17 : for (const auto& txid : unbroadcast_txids) {
1583 [ + - ]: 5 : CTransactionRef tx = m_mempool.get(txid);
1584 : :
1585 [ + - ]: 5 : if (tx != nullptr) {
1586 [ + - ]: 5 : RelayTransaction(txid, tx->GetWitnessHash());
1587 : : } else {
1588 [ # # ]: 0 : m_mempool.RemoveUnbroadcastTx(txid, true);
1589 : : }
1590 : 5 : }
1591 : :
1592 : : // Schedule next run for 10-15 minutes in the future.
1593 : : // We add randomness on every cycle to avoid the possibility of P2P fingerprinting.
1594 : 12 : const auto delta = 10min + FastRandomContext().randrange<std::chrono::milliseconds>(5min);
1595 [ + - ]: 28 : scheduler.scheduleFromNow([&] { ReattemptInitialBroadcast(scheduler); }, delta);
1596 : 12 : }
1597 : :
1598 : 1572 : void PeerManagerImpl::FinalizeNode(const CNode& node)
1599 : : {
1600 : 1572 : NodeId nodeid = node.GetId();
1601 : 1572 : {
1602 : 1572 : LOCK(cs_main);
1603 : 1572 : {
1604 : : // We remove the PeerRef from g_peer_map here, but we don't always
1605 : : // destruct the Peer. Sometimes another thread is still holding a
1606 : : // PeerRef, so the refcount is >= 1. Be careful not to do any
1607 : : // processing here that assumes Peer won't be changed before it's
1608 : : // destructed.
1609 [ + - ]: 1572 : PeerRef peer = RemovePeer(nodeid);
1610 [ - + ]: 1572 : assert(peer != nullptr);
1611 [ - + ]: 1572 : m_wtxid_relay_peers -= peer->m_wtxid_relay;
1612 [ - + ]: 1572 : assert(m_wtxid_relay_peers >= 0);
1613 : 1572 : }
1614 : 1572 : CNodeState *state = State(nodeid);
1615 [ - + ]: 1572 : assert(state != nullptr);
1616 : :
1617 [ + + ]: 1572 : if (state->fSyncStarted)
1618 : 1440 : nSyncStarted--;
1619 : :
1620 [ + + ]: 1681 : for (const QueuedBlock& entry : state->vBlocksInFlight) {
1621 : 109 : auto range = mapBlocksInFlight.equal_range(entry.pindex->GetBlockHash());
1622 [ + + ]: 218 : while (range.first != range.second) {
1623 [ - + ]: 109 : auto [node_id, list_it] = range.first->second;
1624 [ - + ]: 109 : if (node_id != nodeid) {
1625 : 0 : range.first++;
1626 : : } else {
1627 : 109 : range.first = mapBlocksInFlight.erase(range.first);
1628 : : }
1629 : : }
1630 : : }
1631 : 1572 : {
1632 [ + - ]: 1572 : LOCK(m_tx_download_mutex);
1633 [ + - ]: 1572 : m_txdownloadman.DisconnectedPeer(nodeid);
1634 : 0 : }
1635 [ + + + - ]: 1572 : if (m_txreconciliation) m_txreconciliation->ForgetPeer(nodeid);
1636 : 1572 : m_num_preferred_download_peers -= state->fPreferredDownload;
1637 [ - + ]: 1572 : m_peers_downloading_from -= (!state->vBlocksInFlight.empty());
1638 [ - + ]: 1572 : assert(m_peers_downloading_from >= 0);
1639 : 1572 : m_outbound_peers_with_protect_from_disconnect -= state->m_chain_sync.m_protect;
1640 [ - + ]: 1572 : assert(m_outbound_peers_with_protect_from_disconnect >= 0);
1641 : :
1642 : 1572 : m_node_states.erase(nodeid);
1643 : :
1644 [ + + ]: 1572 : if (m_node_states.empty()) {
1645 : : // Do a consistency check after the last peer is removed.
1646 [ - + ]: 882 : assert(mapBlocksInFlight.empty());
1647 [ - + ]: 882 : assert(m_num_preferred_download_peers == 0);
1648 [ - + ]: 882 : assert(m_peers_downloading_from == 0);
1649 [ - + ]: 882 : assert(m_outbound_peers_with_protect_from_disconnect == 0);
1650 [ - + ]: 882 : assert(m_wtxid_relay_peers == 0);
1651 [ + - + - ]: 2646 : WITH_LOCK(m_tx_download_mutex, m_txdownloadman.CheckIsEmpty());
1652 : : }
1653 : 1572 : } // cs_main
1654 : 3063 : if (node.fSuccessfullyConnected &&
1655 [ + + + + : 1572 : !node.IsBlockOnlyConn() && !node.IsInboundConn()) {
+ + ]
1656 : : // Only change visible addrman state for full outbound peers. We don't
1657 : : // call Connected() for feeler connections since they don't have
1658 : : // fSuccessfullyConnected set.
1659 : 526 : m_addrman.Connected(node.addr);
1660 : : }
1661 : 1572 : {
1662 : 1572 : LOCK(m_headers_presync_mutex);
1663 [ + - ]: 1572 : m_headers_presync_stats.erase(nodeid);
1664 : 1572 : }
1665 [ + - ]: 1572 : LogDebug(BCLog::NET, "Cleared nodestate for peer=%d\n", nodeid);
1666 : 1572 : }
1667 : :
1668 : 1624 : bool PeerManagerImpl::HasAllDesirableServiceFlags(ServiceFlags services) const
1669 : : {
1670 : : // Shortcut for (services & GetDesirableServiceFlags(services)) == GetDesirableServiceFlags(services)
1671 : 1624 : return !(GetDesirableServiceFlags(services) & (~services));
1672 : : }
1673 : :
1674 : 1655 : ServiceFlags PeerManagerImpl::GetDesirableServiceFlags(ServiceFlags services) const
1675 : : {
1676 [ + + ]: 1655 : if (services & NODE_NETWORK_LIMITED) {
1677 : : // Limited peers are desirable when we are close to the tip.
1678 [ + + ]: 879 : if (ApproximateBestBlockDepth() < NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS) {
1679 : 595 : return ServiceFlags(NODE_NETWORK_LIMITED | NODE_WITNESS);
1680 : : }
1681 : : }
1682 : : return ServiceFlags(NODE_NETWORK | NODE_WITNESS);
1683 : : }
1684 : :
1685 : 951526 : PeerRef PeerManagerImpl::GetPeerRef(NodeId id) const
1686 : : {
1687 : 951526 : LOCK(m_peer_mutex);
1688 : 951526 : auto it = m_peer_map.find(id);
1689 [ + + + - : 1900062 : return it != m_peer_map.end() ? it->second : nullptr;
+ - ]
1690 : 951526 : }
1691 : :
1692 : 1572 : PeerRef PeerManagerImpl::RemovePeer(NodeId id)
1693 : : {
1694 : 1572 : PeerRef ret;
1695 [ + - ]: 1572 : LOCK(m_peer_mutex);
1696 : 1572 : auto it = m_peer_map.find(id);
1697 [ + - ]: 1572 : if (it != m_peer_map.end()) {
1698 : 1572 : ret = std::move(it->second);
1699 : 1572 : m_peer_map.erase(it);
1700 : : }
1701 [ + - ]: 1572 : return ret;
1702 : 1572 : }
1703 : :
1704 : 10469 : bool PeerManagerImpl::GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const
1705 : : {
1706 : 10469 : {
1707 : 10469 : LOCK(cs_main);
1708 : 10469 : const CNodeState* state = State(nodeid);
1709 [ + + ]: 10469 : if (state == nullptr)
1710 [ + - ]: 9 : return false;
1711 [ + + ]: 10460 : stats.nSyncHeight = state->pindexBestKnownBlock ? state->pindexBestKnownBlock->nHeight : -1;
1712 [ + + ]: 10460 : stats.nCommonHeight = state->pindexLastCommonBlock ? state->pindexLastCommonBlock->nHeight : -1;
1713 [ + + ]: 13833 : for (const QueuedBlock& queue : state->vBlocksInFlight) {
1714 [ + - ]: 3373 : if (queue.pindex)
1715 [ + - ]: 3373 : stats.vHeightInFlight.push_back(queue.pindex->nHeight);
1716 : : }
1717 : 9 : }
1718 : :
1719 : 10460 : PeerRef peer = GetPeerRef(nodeid);
1720 [ + - ]: 10460 : if (peer == nullptr) return false;
1721 [ + + ]: 10460 : stats.their_services = peer->m_their_services;
1722 [ + + ]: 10460 : stats.m_starting_height = peer->m_starting_height;
1723 : : // It is common for nodes with good ping times to suddenly become lagged,
1724 : : // due to a new block arriving or other large transfer.
1725 : : // Merely reporting pingtime might fool the caller into thinking the node was still responsive,
1726 : : // since pingtime does not update until the ping is complete, which might take a while.
1727 : : // So, if a ping is taking an unusually long time in flight,
1728 : : // the caller can immediately detect that this is happening.
1729 : 10460 : auto ping_wait{0us};
1730 [ + + + - ]: 10460 : if ((0 != peer->m_ping_nonce_sent) && (0 != peer->m_ping_start.load().count())) {
1731 : 28 : ping_wait = GetTime<std::chrono::microseconds>() - peer->m_ping_start.load();
1732 : : }
1733 : :
1734 [ + - + + ]: 10460 : if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
1735 [ + - + - ]: 19390 : stats.m_relay_txs = WITH_LOCK(tx_relay->m_bloom_filter_mutex, return tx_relay->m_relay_txs);
1736 : 9695 : stats.m_fee_filter_received = tx_relay->m_fee_filter_received.load();
1737 : : } else {
1738 : 765 : stats.m_relay_txs = false;
1739 : 765 : stats.m_fee_filter_received = 0;
1740 : : }
1741 : :
1742 : 10460 : stats.m_ping_wait = ping_wait;
1743 [ + - ]: 10460 : stats.m_addr_processed = peer->m_addr_processed.load();
1744 : 10460 : stats.m_addr_rate_limited = peer->m_addr_rate_limited.load();
1745 [ + - ]: 10460 : stats.m_addr_relay_enabled = peer->m_addr_relay_enabled.load();
1746 : 10460 : {
1747 [ + - ]: 10460 : LOCK(peer->m_headers_sync_mutex);
1748 [ + + ]: 10460 : if (peer->m_headers_sync) {
1749 : 7 : stats.presync_height = peer->m_headers_sync->GetPresyncHeight();
1750 : : }
1751 : 10460 : }
1752 : 10460 : stats.time_offset = peer->m_time_offset;
1753 : :
1754 : 10460 : return true;
1755 : 10460 : }
1756 : :
1757 : 162 : std::vector<TxOrphanage::OrphanTxBase> PeerManagerImpl::GetOrphanTransactions()
1758 : : {
1759 : 162 : LOCK(m_tx_download_mutex);
1760 [ + - ]: 162 : return m_txdownloadman.GetOrphanTransactions();
1761 : 162 : }
1762 : :
1763 : 955 : PeerManagerInfo PeerManagerImpl::GetInfo() const
1764 : : {
1765 : 955 : return PeerManagerInfo{
1766 : 955 : .median_outbound_time_offset = m_outbound_time_offsets.Median(),
1767 : 955 : .ignores_incoming_txs = m_opts.ignore_incoming_txs,
1768 : 955 : };
1769 : : }
1770 : :
1771 : 1036 : void PeerManagerImpl::AddToCompactExtraTransactions(const CTransactionRef& tx)
1772 : : {
1773 [ + - ]: 1036 : if (m_opts.max_extra_txs <= 0)
1774 : : return;
1775 [ + + ]: 1036 : if (!vExtraTxnForCompact.size())
1776 : 33 : vExtraTxnForCompact.resize(m_opts.max_extra_txs);
1777 : 1036 : vExtraTxnForCompact[vExtraTxnForCompactIt] = tx;
1778 : 1036 : vExtraTxnForCompactIt = (vExtraTxnForCompactIt + 1) % m_opts.max_extra_txs;
1779 : : }
1780 : :
1781 : 1284 : void PeerManagerImpl::Misbehaving(Peer& peer, const std::string& message)
1782 : : {
1783 : 1284 : LOCK(peer.m_misbehavior_mutex);
1784 : :
1785 [ + + + - : 1284 : const std::string message_prefixed = message.empty() ? "" : (": " + message);
+ - ]
1786 : 1284 : peer.m_should_discourage = true;
1787 [ + - + - : 1284 : LogDebug(BCLog::NET, "Misbehaving: peer=%d%s\n", peer.m_id, message_prefixed);
+ - ]
1788 : : TRACEPOINT(net, misbehaving_connection,
1789 : : peer.m_id,
1790 : : message.c_str()
1791 : 1284 : );
1792 [ + - ]: 2568 : }
1793 : :
1794 : 983 : void PeerManagerImpl::MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& state,
1795 : : bool via_compact_block, const std::string& message)
1796 : : {
1797 : 983 : PeerRef peer{GetPeerRef(nodeid)};
1798 [ + + + + : 983 : switch (state.GetResult()) {
+ ]
1799 : : case BlockValidationResult::BLOCK_RESULT_UNSET:
1800 : : break;
1801 : : case BlockValidationResult::BLOCK_HEADER_LOW_WORK:
1802 : : // We didn't try to process the block because the header chain may have
1803 : : // too little work.
1804 : : break;
1805 : : // The node is providing invalid data:
1806 : 897 : case BlockValidationResult::BLOCK_CONSENSUS:
1807 : 897 : case BlockValidationResult::BLOCK_MUTATED:
1808 [ + + ]: 897 : if (!via_compact_block) {
1809 [ + - + - ]: 881 : if (peer) Misbehaving(*peer, message);
1810 : 881 : return;
1811 : : }
1812 : : break;
1813 : 71 : case BlockValidationResult::BLOCK_CACHED_INVALID:
1814 : 71 : {
1815 : : // Discourage outbound (but not inbound) peers if on an invalid chain.
1816 : : // Exempt HB compact block peers. Manual connections are always protected from discouragement.
1817 [ + - + - : 71 : if (peer && !via_compact_block && !peer->m_is_inbound) {
+ + ]
1818 [ + - ]: 36 : if (peer) Misbehaving(*peer, message);
1819 : : return;
1820 : : }
1821 : : break;
1822 : : }
1823 : 9 : case BlockValidationResult::BLOCK_INVALID_HEADER:
1824 : 9 : case BlockValidationResult::BLOCK_INVALID_PREV:
1825 [ + - + - ]: 9 : if (peer) Misbehaving(*peer, message);
1826 : : return;
1827 : : // Conflicting (but not necessarily invalid) data or different policy:
1828 : 2 : case BlockValidationResult::BLOCK_MISSING_PREV:
1829 [ + - + - ]: 2 : if (peer) Misbehaving(*peer, message);
1830 : : return;
1831 : : case BlockValidationResult::BLOCK_TIME_FUTURE:
1832 : : break;
1833 : : }
1834 [ + + ]: 55 : if (message != "") {
1835 [ + - + - : 35 : LogDebug(BCLog::NET, "peer=%d: %s\n", nodeid, message);
+ - ]
1836 : : }
1837 : 983 : }
1838 : :
1839 : 563 : void PeerManagerImpl::MaybePunishNodeForTx(NodeId nodeid, const TxValidationState& state)
1840 : : {
1841 : 563 : PeerRef peer{GetPeerRef(nodeid)};
1842 [ + + ]: 563 : switch (state.GetResult()) {
1843 : : case TxValidationResult::TX_RESULT_UNSET:
1844 : : break;
1845 : : // The node is providing invalid data:
1846 : 60 : case TxValidationResult::TX_CONSENSUS:
1847 [ + - + - : 120 : if (peer) Misbehaving(*peer, "");
+ - ]
1848 [ + - ]: 60 : return;
1849 : : // Conflicting (but not necessarily invalid) data or different policy:
1850 : : case TxValidationResult::TX_INPUTS_NOT_STANDARD:
1851 : : case TxValidationResult::TX_NOT_STANDARD:
1852 : : case TxValidationResult::TX_MISSING_INPUTS:
1853 : : case TxValidationResult::TX_PREMATURE_SPEND:
1854 : : case TxValidationResult::TX_WITNESS_MUTATED:
1855 : : case TxValidationResult::TX_WITNESS_STRIPPED:
1856 : : case TxValidationResult::TX_CONFLICT:
1857 : : case TxValidationResult::TX_MEMPOOL_POLICY:
1858 : : case TxValidationResult::TX_NO_MEMPOOL:
1859 : : case TxValidationResult::TX_RECONSIDERABLE:
1860 : : case TxValidationResult::TX_UNKNOWN:
1861 : : break;
1862 : : }
1863 : 563 : }
1864 : :
1865 : 38902 : bool PeerManagerImpl::BlockRequestAllowed(const CBlockIndex* pindex)
1866 : : {
1867 : 38902 : AssertLockHeld(cs_main);
1868 [ + + ]: 38902 : if (m_chainman.ActiveChain().Contains(pindex)) return true;
1869 [ + - + - : 349 : return pindex->IsValid(BLOCK_VALID_SCRIPTS) && (m_chainman.m_best_header != nullptr) &&
+ + ]
1870 [ + + + + : 521 : (m_chainman.m_best_header->GetBlockTime() - pindex->GetBlockTime() < STALE_RELAY_AGE_LIMIT) &&
- + ]
1871 : 172 : (GetBlockProofEquivalentTime(*m_chainman.m_best_header, *pindex, *m_chainman.m_best_header, m_chainparams.GetConsensus()) < STALE_RELAY_AGE_LIMIT);
1872 : : }
1873 : :
1874 : 6 : std::optional<std::string> PeerManagerImpl::FetchBlock(NodeId peer_id, const CBlockIndex& block_index)
1875 : : {
1876 [ - + ]: 6 : if (m_chainman.m_blockman.LoadingBlocks()) return "Loading blocks ...";
1877 : :
1878 : : // Ensure this peer exists and hasn't been disconnected
1879 : 6 : PeerRef peer = GetPeerRef(peer_id);
1880 [ + + + - ]: 6 : if (peer == nullptr) return "Peer does not exist";
1881 : :
1882 : : // Ignore pre-segwit peers
1883 [ + + + - ]: 4 : if (!CanServeWitnesses(*peer)) return "Pre-SegWit peer";
1884 : :
1885 [ + - ]: 3 : LOCK(cs_main);
1886 : :
1887 : : // Forget about all prior requests
1888 [ + - ]: 3 : RemoveBlockRequest(block_index.GetBlockHash(), std::nullopt);
1889 : :
1890 : : // Mark block as in-flight
1891 [ + - - + : 3 : if (!BlockRequested(peer_id, block_index)) return "Already requested from this peer";
- - ]
1892 : :
1893 : : // Construct message to request the block
1894 : 3 : const uint256& hash{block_index.GetBlockHash()};
1895 [ + - + - ]: 3 : std::vector<CInv> invs{CInv(MSG_BLOCK | MSG_WITNESS_FLAG, hash)};
1896 : :
1897 : : // Send block request message to the peer
1898 [ + - ]: 3 : bool success = m_connman.ForNode(peer_id, [this, &invs](CNode* node) {
1899 [ + - ]: 3 : this->MakeAndPushMessage(*node, NetMsgType::GETDATA, invs);
1900 : 3 : return true;
1901 : : });
1902 : :
1903 [ - + - - ]: 3 : if (!success) return "Peer not fully connected";
1904 : :
1905 [ + - + - : 6 : LogDebug(BCLog::NET, "Requesting block %s from peer=%d\n",
+ - + - ]
1906 : : hash.ToString(), peer_id);
1907 : 3 : return std::nullopt;
1908 : 12 : }
1909 : :
1910 : 1115 : std::unique_ptr<PeerManager> PeerManager::make(CConnman& connman, AddrMan& addrman,
1911 : : BanMan* banman, ChainstateManager& chainman,
1912 : : CTxMemPool& pool, node::Warnings& warnings, Options opts)
1913 : : {
1914 [ - + ]: 1115 : return std::make_unique<PeerManagerImpl>(connman, addrman, banman, chainman, pool, warnings, opts);
1915 : : }
1916 : :
1917 : 1115 : PeerManagerImpl::PeerManagerImpl(CConnman& connman, AddrMan& addrman,
1918 : : BanMan* banman, ChainstateManager& chainman,
1919 : 1115 : CTxMemPool& pool, node::Warnings& warnings, Options opts)
1920 : 1115 : : m_rng{opts.deterministic_rng},
1921 [ + - ]: 1115 : m_fee_filter_rounder{CFeeRate{DEFAULT_MIN_RELAY_TX_FEE}, m_rng},
1922 : 1115 : m_chainparams(chainman.GetParams()),
1923 : 1115 : m_connman(connman),
1924 : 1115 : m_addrman(addrman),
1925 : 1115 : m_banman(banman),
1926 : 1115 : m_chainman(chainman),
1927 : 1115 : m_mempool(pool),
1928 [ + - ]: 1115 : m_txdownloadman(node::TxDownloadOptions{pool, m_rng, opts.max_orphan_txs, opts.deterministic_rng}),
1929 [ + - ]: 1115 : m_warnings{warnings},
1930 [ + - + - : 2230 : m_opts{opts}
+ + ]
1931 : : {
1932 : : // While Erlay support is incomplete, it must be enabled explicitly via -txreconciliation.
1933 : : // This argument can go away after Erlay support is complete.
1934 [ + + ]: 1115 : if (opts.reconcile_txs) {
1935 [ + - ]: 5 : m_txreconciliation = std::make_unique<TxReconciliationTracker>(TXRECONCILIATION_VERSION);
1936 : : }
1937 [ - - - - ]: 1115 : }
1938 : :
1939 : 927 : void PeerManagerImpl::StartScheduledTasks(CScheduler& scheduler)
1940 : : {
1941 : : // Stale tip checking and peer eviction are on two different timers, but we
1942 : : // don't want them to get out of sync due to drift in the scheduler, so we
1943 : : // combine them in one function and schedule at the quicker (peer-eviction)
1944 : : // timer.
1945 : 927 : static_assert(EXTRA_PEER_CHECK_INTERVAL < STALE_CHECK_INTERVAL, "peer eviction timer should be less than stale tip check timer");
1946 [ + - ]: 1108 : scheduler.scheduleEvery([this] { this->CheckForStaleTipAndEvictPeers(); }, std::chrono::seconds{EXTRA_PEER_CHECK_INTERVAL});
1947 : :
1948 : : // schedule next run for 10-15 minutes in the future
1949 : 927 : const auto delta = 10min + FastRandomContext().randrange<std::chrono::milliseconds>(5min);
1950 [ + - ]: 935 : scheduler.scheduleFromNow([&] { ReattemptInitialBroadcast(scheduler); }, delta);
1951 : 927 : }
1952 : :
1953 : 113621 : void PeerManagerImpl::ActiveTipChange(const CBlockIndex& new_tip, bool is_ibd)
1954 : : {
1955 : : // Ensure mempool mutex was released, otherwise deadlock may occur if another thread holding
1956 : : // m_tx_download_mutex waits on the mempool mutex.
1957 : 113621 : AssertLockNotHeld(m_mempool.cs);
1958 : 113621 : AssertLockNotHeld(m_tx_download_mutex);
1959 : :
1960 [ + + ]: 113621 : if (!is_ibd) {
1961 : 97416 : LOCK(m_tx_download_mutex);
1962 : : // If the chain tip has changed, previously rejected transactions might now be valid, e.g. due
1963 : : // to a timelock. Reset the rejection filters to give those transactions another chance if we
1964 : : // see them again.
1965 [ + - ]: 97416 : m_txdownloadman.ActiveTipChange();
1966 : 97416 : }
1967 : 113621 : }
1968 : :
1969 : : /**
1970 : : * Evict orphan txn pool entries based on a newly connected
1971 : : * block, remember the recently confirmed transactions, and delete tracked
1972 : : * announcements for them. Also save the time of the last tip update and
1973 : : * possibly reduce dynamic block stalling timeout.
1974 : : */
1975 : 120708 : void PeerManagerImpl::BlockConnected(
1976 : : ChainstateRole role,
1977 : : const std::shared_ptr<const CBlock>& pblock,
1978 : : const CBlockIndex* pindex)
1979 : : {
1980 : : // Update this for all chainstate roles so that we don't mistakenly see peers
1981 : : // helping us do background IBD as having a stale tip.
1982 : 120708 : m_last_tip_update = GetTime<std::chrono::seconds>();
1983 : :
1984 : : // In case the dynamic timeout was doubled once or more, reduce it slowly back to its default value
1985 [ + + ]: 120708 : auto stalling_timeout = m_block_stalling_timeout.load();
1986 [ + + ]: 120708 : Assume(stalling_timeout >= BLOCK_STALLING_TIMEOUT_DEFAULT);
1987 [ + + ]: 120708 : if (stalling_timeout != BLOCK_STALLING_TIMEOUT_DEFAULT) {
1988 : 16 : const auto new_timeout = std::max(std::chrono::duration_cast<std::chrono::seconds>(stalling_timeout * 0.85), BLOCK_STALLING_TIMEOUT_DEFAULT);
1989 [ + - ]: 16 : if (m_block_stalling_timeout.compare_exchange_strong(stalling_timeout, new_timeout)) {
1990 [ + - ]: 16 : LogDebug(BCLog::NET, "Decreased stalling timeout to %d seconds\n", count_seconds(new_timeout));
1991 : : }
1992 : : }
1993 : :
1994 : : // The following task can be skipped since we don't maintain a mempool for
1995 : : // the ibd/background chainstate.
1996 [ + + ]: 120708 : if (role == ChainstateRole::BACKGROUND) {
1997 : : return;
1998 : : }
1999 : 119909 : LOCK(m_tx_download_mutex);
2000 [ + - ]: 119909 : m_txdownloadman.BlockConnected(pblock);
2001 : 119909 : }
2002 : :
2003 : 12054 : void PeerManagerImpl::BlockDisconnected(const std::shared_ptr<const CBlock> &block, const CBlockIndex* pindex)
2004 : : {
2005 : 12054 : LOCK(m_tx_download_mutex);
2006 [ + - ]: 12054 : m_txdownloadman.BlockDisconnected();
2007 : 12054 : }
2008 : :
2009 : : /**
2010 : : * Maintain state about the best-seen block and fast-announce a compact block
2011 : : * to compatible peers.
2012 : : */
2013 : 94590 : void PeerManagerImpl::NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock)
2014 : : {
2015 [ + - ]: 94590 : auto pcmpctblock = std::make_shared<const CBlockHeaderAndShortTxIDs>(*pblock, FastRandomContext().rand64());
2016 : :
2017 [ + - ]: 94590 : LOCK(cs_main);
2018 : :
2019 [ + + ]: 94590 : if (pindex->nHeight <= m_highest_fast_announce)
2020 : : return;
2021 : 90927 : m_highest_fast_announce = pindex->nHeight;
2022 : :
2023 [ + + ]: 90927 : if (!DeploymentActiveAt(*pindex, m_chainman, Consensus::DEPLOYMENT_SEGWIT)) return;
2024 : :
2025 [ + - ]: 89626 : uint256 hashBlock(pblock->GetHash());
2026 : 89626 : const std::shared_future<CSerializedNetMsg> lazy_ser{
2027 [ + - + - : 122668 : std::async(std::launch::deferred, [&] { return NetMsg::Make(NetMsgType::CMPCTBLOCK, *pcmpctblock); })};
+ - ]
2028 : :
2029 : 89626 : {
2030 [ + - ]: 89626 : auto most_recent_block_txs = std::make_unique<std::map<uint256, CTransactionRef>>();
2031 [ + + ]: 207111 : for (const auto& tx : pblock->vtx) {
2032 [ + - ]: 117485 : most_recent_block_txs->emplace(tx->GetHash(), tx);
2033 [ + - ]: 117485 : most_recent_block_txs->emplace(tx->GetWitnessHash(), tx);
2034 : : }
2035 : :
2036 [ + - ]: 89626 : LOCK(m_most_recent_block_mutex);
2037 : 89626 : m_most_recent_block_hash = hashBlock;
2038 : 89626 : m_most_recent_block = pblock;
2039 : 89626 : m_most_recent_compact_block = pcmpctblock;
2040 [ + - ]: 89626 : m_most_recent_block_txs = std::move(most_recent_block_txs);
2041 : 89626 : }
2042 : :
2043 [ + - + - : 179252 : m_connman.ForEachNode([this, pindex, &lazy_ser, &hashBlock](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
+ - ]
2044 : 81821 : AssertLockHeld(::cs_main);
2045 : :
2046 [ + - - + ]: 81821 : if (pnode->GetCommonVersion() < INVALID_CB_NO_BAN_VERSION || pnode->fDisconnect)
2047 : 0 : return;
2048 : 81821 : ProcessBlockAvailability(pnode->GetId());
2049 : 81821 : CNodeState &state = *State(pnode->GetId());
2050 : : // If the peer has, or we announced to them the previous block already,
2051 : : // but we don't think they have this one, go ahead and announce it
2052 [ + + + + : 81821 : if (state.m_requested_hb_cmpctblocks && !PeerHasHeader(&state, pindex) && PeerHasHeader(&state, pindex->pprev)) {
+ + ]
2053 : :
2054 [ + - + - ]: 42708 : LogDebug(BCLog::NET, "%s sending header-and-ids %s to peer=%d\n", "PeerManager::NewPoWValidBlock",
2055 : : hashBlock.ToString(), pnode->GetId());
2056 : :
2057 : 21354 : const CSerializedNetMsg& ser_cmpctblock{lazy_ser.get()};
2058 [ + - ]: 21354 : PushMessage(*pnode, ser_cmpctblock.Copy());
2059 : 21354 : state.pindexBestHeaderSent = pindex;
2060 : : }
2061 : : });
2062 [ + - + - : 278806 : }
+ - ]
2063 : :
2064 : : /**
2065 : : * Update our best height and announce any block hashes which weren't previously
2066 : : * in m_chainman.ActiveChain() to our peers.
2067 : : */
2068 : 110866 : void PeerManagerImpl::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload)
2069 : : {
2070 : 110866 : SetBestBlock(pindexNew->nHeight, std::chrono::seconds{pindexNew->GetBlockTime()});
2071 : :
2072 : : // Don't relay inventory during initial block download.
2073 [ + + ]: 110866 : if (fInitialDownload) return;
2074 : :
2075 : : // Find the hashes of all blocks that weren't previously in the best chain.
2076 : 94667 : std::vector<uint256> vHashes;
2077 : 94667 : const CBlockIndex *pindexToAnnounce = pindexNew;
2078 [ + + ]: 189610 : while (pindexToAnnounce != pindexFork) {
2079 [ + - ]: 94967 : vHashes.push_back(pindexToAnnounce->GetBlockHash());
2080 : 94967 : pindexToAnnounce = pindexToAnnounce->pprev;
2081 [ + + ]: 94967 : if (vHashes.size() == MAX_BLOCKS_TO_ANNOUNCE) {
2082 : : // Limit announcements in case of a huge reorganization.
2083 : : // Rely on the peer's synchronization mechanism in that case.
2084 : : break;
2085 : : }
2086 : : }
2087 : :
2088 : 94667 : {
2089 [ + - ]: 94667 : LOCK(m_peer_mutex);
2090 [ + + ]: 183176 : for (auto& it : m_peer_map) {
2091 [ + - ]: 88509 : Peer& peer = *it.second;
2092 [ + - ]: 88509 : LOCK(peer.m_block_inv_mutex);
2093 [ + + ]: 177439 : for (const uint256& hash : vHashes | std::views::reverse) {
2094 [ + - ]: 88930 : peer.m_blocks_for_headers_relay.push_back(hash);
2095 : : }
2096 : 88509 : }
2097 : 0 : }
2098 : :
2099 [ + - ]: 94667 : m_connman.WakeMessageHandler();
2100 : 94667 : }
2101 : :
2102 : : /**
2103 : : * Handle invalid block rejection and consequent peer discouragement, maintain which
2104 : : * peers announce compact blocks.
2105 : : */
2106 : 124131 : void PeerManagerImpl::BlockChecked(const CBlock& block, const BlockValidationState& state)
2107 : : {
2108 : 124131 : LOCK(cs_main);
2109 : :
2110 [ + - ]: 124131 : const uint256 hash(block.GetHash());
2111 : 124131 : std::map<uint256, std::pair<NodeId, bool>>::iterator it = mapBlockSource.find(hash);
2112 : :
2113 : : // If the block failed validation, we know where it came from and we're still connected
2114 : : // to that peer, maybe punish.
2115 [ + + + + ]: 124131 : if (state.IsInvalid() &&
2116 [ + + + + : 125040 : it != mapBlockSource.end() &&
+ - ]
2117 : 909 : State(it->second.first)) {
2118 [ + - + - ]: 1818 : MaybePunishNodeForBlock(/*nodeid=*/ it->second.first, state, /*via_compact_block=*/ !it->second.second);
2119 : : }
2120 : : // Check that:
2121 : : // 1. The block is valid
2122 : : // 2. We're not in initial block download
2123 : : // 3. This is currently the best block we're aware of. We haven't updated
2124 : : // the tip yet so we have no way to check this directly here. Instead we
2125 : : // just check that there are currently no other blocks in flight.
2126 [ + + ]: 120708 : else if (state.IsValid() &&
2127 [ + + + - : 226740 : !m_chainman.IsInitialBlockDownload() &&
+ + ]
2128 [ + + ]: 103518 : mapBlocksInFlight.count(hash) == mapBlocksInFlight.size()) {
2129 [ + + ]: 76335 : if (it != mapBlockSource.end()) {
2130 [ + - ]: 19092 : MaybeSetPeerAsAnnouncingHeaderAndIDs(it->second.first);
2131 : : }
2132 : : }
2133 [ + + ]: 124131 : if (it != mapBlockSource.end())
2134 : 57413 : mapBlockSource.erase(it);
2135 : 124131 : }
2136 : :
2137 : : //////////////////////////////////////////////////////////////////////////////
2138 : : //
2139 : : // Messages
2140 : : //
2141 : :
2142 : 869 : bool PeerManagerImpl::AlreadyHaveBlock(const uint256& block_hash)
2143 : : {
2144 : 869 : return m_chainman.m_blockman.LookupBlockIndex(block_hash) != nullptr;
2145 : : }
2146 : :
2147 : 3 : void PeerManagerImpl::SendPings()
2148 : : {
2149 : 3 : LOCK(m_peer_mutex);
2150 [ + + ]: 8 : for(auto& it : m_peer_map) it.second->m_ping_queued = true;
2151 : 3 : }
2152 : :
2153 : 29701 : void PeerManagerImpl::RelayTransaction(const uint256& txid, const uint256& wtxid)
2154 : : {
2155 : 29701 : LOCK(m_peer_mutex);
2156 [ + + ]: 79537 : for(auto& it : m_peer_map) {
2157 [ + - ]: 49836 : Peer& peer = *it.second;
2158 [ + - ]: 49836 : auto tx_relay = peer.GetTxRelay();
2159 [ + + ]: 49836 : if (!tx_relay) continue;
2160 : :
2161 [ + - ]: 49835 : LOCK(tx_relay->m_tx_inventory_mutex);
2162 : : // Only queue transactions for announcement once the version handshake
2163 : : // is completed. The time of arrival for these transactions is
2164 : : // otherwise at risk of leaking to a spy, if the spy is able to
2165 : : // distinguish transactions received during the handshake from the rest
2166 : : // in the announcement.
2167 [ + + + - ]: 49835 : if (tx_relay->m_next_inv_send_time == 0s) continue;
2168 : :
2169 [ + + ]: 49834 : const uint256& hash{peer.m_wtxid_relay ? wtxid : txid};
2170 [ + - + + ]: 49834 : if (!tx_relay->m_tx_inventory_known_filter.contains(hash)) {
2171 [ + - ]: 20449 : tx_relay->m_tx_inventory_to_send.insert(hash);
2172 : : }
2173 [ + - ]: 79536 : };
2174 : 29701 : }
2175 : :
2176 : 53 : void PeerManagerImpl::RelayAddress(NodeId originator,
2177 : : const CAddress& addr,
2178 : : bool fReachable)
2179 : : {
2180 : : // We choose the same nodes within a given 24h window (if the list of connected
2181 : : // nodes does not change) and we don't relay to nodes that already know an
2182 : : // address. So within 24h we will likely relay a given address once. This is to
2183 : : // prevent a peer from unjustly giving their address better propagation by sending
2184 : : // it to us repeatedly.
2185 : :
2186 [ + + + - ]: 53 : if (!fReachable && !addr.IsRelayable()) return;
2187 : :
2188 : : // Relay to a limited number of other nodes
2189 : : // Use deterministic randomness to send to the same nodes for 24 hours
2190 : : // at a time so the m_addr_knowns of the chosen nodes prevent repeats
2191 : 53 : const uint64_t hash_addr{CServiceHash(0, 0)(addr)};
2192 : 53 : const auto current_time{GetTime<std::chrono::seconds>()};
2193 : : // Adding address hash makes exact rotation time different per address, while preserving periodicity.
2194 : 53 : const uint64_t time_addr{(static_cast<uint64_t>(count_seconds(current_time)) + hash_addr) / count_seconds(ROTATE_ADDR_RELAY_DEST_INTERVAL)};
2195 : 53 : const CSipHasher hasher{m_connman.GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY)
2196 : 53 : .Write(hash_addr)
2197 : 53 : .Write(time_addr)};
2198 : :
2199 : : // Relay reachable addresses to 2 peers. Unreachable addresses are relayed randomly to 1 or 2 peers.
2200 [ + + - + ]: 53 : unsigned int nRelayNodes = (fReachable || (hasher.Finalize() & 1)) ? 2 : 1;
2201 : :
2202 : 53 : std::array<std::pair<uint64_t, Peer*>, 2> best{{{0, nullptr}, {0, nullptr}}};
2203 [ - + ]: 53 : assert(nRelayNodes <= best.size());
2204 : :
2205 : 53 : LOCK(m_peer_mutex);
2206 : :
2207 [ + + + + ]: 622 : for (auto& [id, peer] : m_peer_map) {
2208 [ + + + + : 569 : if (peer->m_addr_relay_enabled && id != originator && IsAddrCompatible(*peer, addr)) {
+ - + - ]
2209 [ + - + - ]: 512 : uint64_t hashKey = CSipHasher(hasher).Write(id).Finalize();
2210 [ + + ]: 1190 : for (unsigned int i = 0; i < nRelayNodes; i++) {
2211 [ + + ]: 893 : if (hashKey > best[i].first) {
2212 : 215 : std::copy(best.begin() + i, best.begin() + nRelayNodes - 1, best.begin() + i + 1);
2213 : 215 : best[i] = std::make_pair(hashKey, peer.get());
2214 : 215 : break;
2215 : : }
2216 : : }
2217 : : }
2218 : : };
2219 : :
2220 [ + + + + ]: 135 : for (unsigned int i = 0; i < nRelayNodes && best[i].first != 0; i++) {
2221 [ + - ]: 82 : PushAddress(*best[i].second, addr);
2222 : : }
2223 : 53 : }
2224 : :
2225 : 38886 : void PeerManagerImpl::ProcessGetBlockData(CNode& pfrom, Peer& peer, const CInv& inv)
2226 : : {
2227 : 38886 : std::shared_ptr<const CBlock> a_recent_block;
2228 : 38886 : std::shared_ptr<const CBlockHeaderAndShortTxIDs> a_recent_compact_block;
2229 : 38886 : {
2230 [ + - ]: 38886 : LOCK(m_most_recent_block_mutex);
2231 : 38886 : a_recent_block = m_most_recent_block;
2232 [ + - ]: 38886 : a_recent_compact_block = m_most_recent_compact_block;
2233 : 38886 : }
2234 : :
2235 : 38886 : bool need_activate_chain = false;
2236 : 38886 : {
2237 [ + - ]: 38886 : LOCK(cs_main);
2238 [ + - ]: 38886 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(inv.hash);
2239 [ + - ]: 38886 : if (pindex) {
2240 [ + - + + : 77772 : if (pindex->HaveNumChainTxs() && !pindex->IsValid(BLOCK_VALID_SCRIPTS) &&
+ - ]
2241 [ - + + - ]: 38886 : pindex->IsValid(BLOCK_VALID_TREE)) {
2242 : : // If we have the block and all of its parents, but have not yet validated it,
2243 : : // we might be in the middle of connecting it (ie in the unlock of cs_main
2244 : : // before ActivateBestChain but after AcceptBlock).
2245 : : // In this case, we need to run ActivateBestChain prior to checking the relay
2246 : : // conditions below.
2247 : : need_activate_chain = true;
2248 : : }
2249 : : }
2250 : 0 : } // release cs_main before calling ActivateBestChain
2251 [ + + ]: 38886 : if (need_activate_chain) {
2252 [ + - ]: 15 : BlockValidationState state;
2253 [ + - + - : 45 : if (!m_chainman.ActiveChainstate().ActivateBestChain(state, a_recent_block)) {
+ - + - -
+ ]
2254 [ # # # # : 0 : LogDebug(BCLog::NET, "failed to activate chain (%s)\n", state.ToString());
# # # # ]
2255 : : }
2256 : 15 : }
2257 : :
2258 : 38886 : const CBlockIndex* pindex{nullptr};
2259 : 38886 : const CBlockIndex* tip{nullptr};
2260 : 38886 : bool can_direct_fetch{false};
2261 : 38886 : FlatFilePos block_pos{};
2262 : 38886 : {
2263 [ + - ]: 38886 : LOCK(cs_main);
2264 [ + - ]: 38886 : pindex = m_chainman.m_blockman.LookupBlockIndex(inv.hash);
2265 [ + - ]: 38886 : if (!pindex) {
2266 : : return;
2267 : : }
2268 [ + - + + ]: 38886 : if (!BlockRequestAllowed(pindex)) {
2269 [ + - + - : 1 : LogDebug(BCLog::NET, "%s: ignoring request from peer=%i for old block that isn't in the main chain\n", __func__, pfrom.GetId());
+ - ]
2270 : 1 : return;
2271 : : }
2272 : : // disconnect node in case we have reached the outbound limit for serving historical blocks
2273 [ + - ]: 38885 : if (m_connman.OutboundTargetReached(true) &&
2274 [ + + + - : 38885 : (((m_chainman.m_best_header != nullptr) && (m_chainman.m_best_header->GetBlockTime() - pindex->GetBlockTime() > HISTORICAL_BLOCK_AGE)) || inv.IsMsgFilteredBlk()) &&
+ + - + ]
2275 [ + + ]: 3 : !pfrom.HasPermission(NetPermissionFlags::Download) // nodes with the download permission may exceed target
2276 : : ) {
2277 [ + - + - : 4 : LogDebug(BCLog::NET, "historical block serving limit reached, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
2278 : 2 : pfrom.fDisconnect = true;
2279 : 2 : return;
2280 : : }
2281 [ + - + - ]: 38883 : tip = m_chainman.ActiveChain().Tip();
2282 : : // Avoid leaking prune-height by never sending blocks below the NODE_NETWORK_LIMITED threshold
2283 [ + + ]: 38883 : if (!pfrom.HasPermission(NetPermissionFlags::NoBan) && (
2284 [ + + + + ]: 36637 : (((peer.m_our_services & NODE_NETWORK_LIMITED) == NODE_NETWORK_LIMITED) && ((peer.m_our_services & NODE_NETWORK) != NODE_NETWORK) && (tip->nHeight - pindex->nHeight > (int)NODE_NETWORK_LIMITED_MIN_BLOCKS + 2 /* add two blocks buffer extension for possible races */) )
2285 : : )) {
2286 [ + - + - : 4 : LogDebug(BCLog::NET, "Ignore block request below NODE_NETWORK_LIMITED threshold, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
2287 : : //disconnect node and prevent it from stalling (would otherwise wait for the missing block)
2288 : 2 : pfrom.fDisconnect = true;
2289 : 2 : return;
2290 : : }
2291 : : // Pruned nodes may have deleted the block, so check whether
2292 : : // it's available before trying to send.
2293 [ + - ]: 38881 : if (!(pindex->nStatus & BLOCK_HAVE_DATA)) {
2294 : : return;
2295 : : }
2296 [ + - ]: 38881 : can_direct_fetch = CanDirectFetch();
2297 [ + - ]: 38881 : block_pos = pindex->GetBlockPos();
2298 : 5 : }
2299 : :
2300 : 38881 : std::shared_ptr<const CBlock> pblock;
2301 [ + + + - : 38881 : if (a_recent_block && a_recent_block->GetHash() == pindex->GetBlockHash()) {
+ + ]
2302 : 1616 : pblock = a_recent_block;
2303 [ + + ]: 37265 : } else if (inv.IsMsgWitnessBlk()) {
2304 : : // Fast-path: in this case it is possible to serve the block directly from disk,
2305 : : // as the network format matches the format on disk
2306 : 31972 : std::vector<uint8_t> block_data;
2307 [ + - - + ]: 31972 : if (!m_chainman.m_blockman.ReadRawBlock(block_data, block_pos)) {
2308 [ # # # # : 0 : if (WITH_LOCK(m_chainman.GetMutex(), return m_chainman.m_blockman.IsBlockPruned(*pindex))) {
# # # # ]
2309 [ # # # # : 0 : LogDebug(BCLog::NET, "Block was pruned before it could be read, %s\n", pfrom.DisconnectMsg(fLogIPs));
# # # # ]
2310 : : } else {
2311 [ # # # # ]: 0 : LogError("Cannot load block from disk, %s\n", pfrom.DisconnectMsg(fLogIPs));
2312 : : }
2313 : 0 : pfrom.fDisconnect = true;
2314 : 0 : return;
2315 : : }
2316 [ + - + - ]: 63944 : MakeAndPushMessage(pfrom, NetMsgType::BLOCK, std::span{block_data});
2317 : : // Don't set pblock as we've sent the block
2318 : 31972 : } else {
2319 : : // Send block from disk
2320 [ + - ]: 5293 : std::shared_ptr<CBlock> pblockRead = std::make_shared<CBlock>();
2321 [ + - - + ]: 5293 : if (!m_chainman.m_blockman.ReadBlock(*pblockRead, block_pos)) {
2322 [ # # # # : 0 : if (WITH_LOCK(m_chainman.GetMutex(), return m_chainman.m_blockman.IsBlockPruned(*pindex))) {
# # # # ]
2323 [ # # # # : 0 : LogDebug(BCLog::NET, "Block was pruned before it could be read, %s\n", pfrom.DisconnectMsg(fLogIPs));
# # # # ]
2324 : : } else {
2325 [ # # # # ]: 0 : LogError("Cannot load block from disk, %s\n", pfrom.DisconnectMsg(fLogIPs));
2326 : : }
2327 [ # # ]: 0 : pfrom.fDisconnect = true;
2328 [ # # ]: 0 : return;
2329 : : }
2330 [ + - ]: 5293 : pblock = pblockRead;
2331 : 5293 : }
2332 [ + + ]: 38881 : if (pblock) {
2333 [ + + ]: 6909 : if (inv.IsMsgBlk()) {
2334 [ + - + - ]: 12342 : MakeAndPushMessage(pfrom, NetMsgType::BLOCK, TX_NO_WITNESS(*pblock));
2335 [ + + ]: 738 : } else if (inv.IsMsgWitnessBlk()) {
2336 [ + - + - ]: 754 : MakeAndPushMessage(pfrom, NetMsgType::BLOCK, TX_WITH_WITNESS(*pblock));
2337 [ + + ]: 361 : } else if (inv.IsMsgFilteredBlk()) {
2338 : 7 : bool sendMerkleBlock = false;
2339 [ + - ]: 7 : CMerkleBlock merkleBlock;
2340 [ + - + - ]: 7 : if (auto tx_relay = peer.GetTxRelay(); tx_relay != nullptr) {
2341 [ + - ]: 7 : LOCK(tx_relay->m_bloom_filter_mutex);
2342 [ + + ]: 7 : if (tx_relay->m_bloom_filter) {
2343 : 4 : sendMerkleBlock = true;
2344 [ + - ]: 4 : merkleBlock = CMerkleBlock(*pblock, *tx_relay->m_bloom_filter);
2345 : : }
2346 : 0 : }
2347 [ + + ]: 7 : if (sendMerkleBlock) {
2348 [ + - + - ]: 4 : MakeAndPushMessage(pfrom, NetMsgType::MERKLEBLOCK, merkleBlock);
2349 : : // CMerkleBlock just contains hashes, so also push any transactions in the block the client did not see
2350 : : // This avoids hurting performance by pointlessly requiring a round-trip
2351 : : // Note that there is currently no way for a node to request any single transactions we didn't send here -
2352 : : // they must either disconnect and retry or request the full block.
2353 : : // Thus, the protocol spec specified allows for us to provide duplicate txn here,
2354 : : // however we MUST always provide at least what the remote peer needs
2355 : 4 : typedef std::pair<unsigned int, uint256> PairType;
2356 [ + + ]: 6 : for (PairType& pair : merkleBlock.vMatchedTxn)
2357 [ + - + - ]: 4 : MakeAndPushMessage(pfrom, NetMsgType::TX, TX_NO_WITNESS(*pblock->vtx[pair.first]));
2358 : : }
2359 : : // else
2360 : : // no response
2361 [ + - ]: 361 : } else if (inv.IsMsgCmpctBlk()) {
2362 : : // If a peer is asking for old blocks, we're almost guaranteed
2363 : : // they won't have a useful mempool to match against a compact block,
2364 : : // and we don't feel like constructing the object for them, so
2365 : : // instead we respond with the full, non-compact block.
2366 [ + - + + ]: 354 : if (can_direct_fetch && pindex->nHeight >= tip->nHeight - MAX_CMPCTBLOCK_DEPTH) {
2367 [ + + + - : 309 : if (a_recent_compact_block && a_recent_compact_block->header.GetHash() == pindex->GetBlockHash()) {
+ + ]
2368 [ + - + - ]: 382 : MakeAndPushMessage(pfrom, NetMsgType::CMPCTBLOCK, *a_recent_compact_block);
2369 : : } else {
2370 [ + - ]: 118 : CBlockHeaderAndShortTxIDs cmpctblock{*pblock, m_rng.rand64()};
2371 [ + - + - ]: 236 : MakeAndPushMessage(pfrom, NetMsgType::CMPCTBLOCK, cmpctblock);
2372 : 118 : }
2373 : : } else {
2374 [ + - + - ]: 90 : MakeAndPushMessage(pfrom, NetMsgType::BLOCK, TX_WITH_WITNESS(*pblock));
2375 : : }
2376 : : }
2377 : : }
2378 : :
2379 : 38881 : {
2380 [ + - ]: 38881 : LOCK(peer.m_block_inv_mutex);
2381 : : // Trigger the peer node to send a getblocks request for the next batch of inventory
2382 [ - + ]: 38881 : if (inv.hash == peer.m_continuation_block) {
2383 : : // Send immediately. This must send even if redundant,
2384 : : // and we want it right after the last block so they don't
2385 : : // wait for other stuff first.
2386 : 0 : std::vector<CInv> vInv;
2387 [ # # ]: 0 : vInv.emplace_back(MSG_BLOCK, tip->GetBlockHash());
2388 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::INV, vInv);
2389 : 0 : peer.m_continuation_block.SetNull();
2390 : 0 : }
2391 [ + + ]: 38881 : }
2392 [ + + + + : 112431 : }
+ - ]
2393 : :
2394 : 11684 : CTransactionRef PeerManagerImpl::FindTxForGetData(const Peer::TxRelay& tx_relay, const GenTxid& gtxid)
2395 : : {
2396 : : // If a tx was in the mempool prior to the last INV for this peer, permit the request.
2397 : 11684 : auto txinfo = m_mempool.info_for_relay(gtxid, tx_relay.m_last_inv_sequence);
2398 [ + + ]: 11684 : if (txinfo.tx) {
2399 : 11660 : return std::move(txinfo.tx);
2400 : : }
2401 : :
2402 : : // Or it might be from the most recent block
2403 : 24 : {
2404 [ + - ]: 24 : LOCK(m_most_recent_block_mutex);
2405 [ + - ]: 24 : if (m_most_recent_block_txs != nullptr) {
2406 : 24 : auto it = m_most_recent_block_txs->find(gtxid.GetHash());
2407 [ + + + - : 36 : if (it != m_most_recent_block_txs->end()) return it->second;
+ - ]
2408 : : }
2409 : 12 : }
2410 : :
2411 : 12 : return {};
2412 : 11684 : }
2413 : :
2414 : 44476 : void PeerManagerImpl::ProcessGetData(CNode& pfrom, Peer& peer, const std::atomic<bool>& interruptMsgProc)
2415 : : {
2416 : 44476 : AssertLockNotHeld(cs_main);
2417 : :
2418 : 44476 : auto tx_relay = peer.GetTxRelay();
2419 : :
2420 : 44476 : std::deque<CInv>::iterator it = peer.m_getdata_requests.begin();
2421 : 44476 : std::vector<CInv> vNotFound;
2422 : :
2423 : : // Process as many TX items from the front of the getdata queue as
2424 : : // possible, since they're common and it's efficient to batch process
2425 : : // them.
2426 [ + + + + ]: 56160 : while (it != peer.m_getdata_requests.end() && it->IsGenTxMsg()) {
2427 [ - + ]: 11684 : if (interruptMsgProc) return;
2428 : : // The send buffer provides backpressure. If there's no space in
2429 : : // the buffer, pause processing until the next call.
2430 [ + - ]: 11684 : if (pfrom.fPauseSend) break;
2431 : :
2432 : 11684 : const CInv &inv = *it++;
2433 : :
2434 [ - + ]: 11684 : if (tx_relay == nullptr) {
2435 : : // Ignore GETDATA requests for transactions from block-relay-only
2436 : : // peers and peers that asked us not to announce transactions.
2437 : 0 : continue;
2438 : : }
2439 : :
2440 [ + - + - ]: 11684 : CTransactionRef tx = FindTxForGetData(*tx_relay, ToGenTxid(inv));
2441 [ + + ]: 11684 : if (tx) {
2442 : : // WTX and WITNESS_TX imply we serialize with witness
2443 [ - + ]: 11672 : const auto maybe_with_witness = (inv.IsMsgTx() ? TX_NO_WITNESS : TX_WITH_WITNESS);
2444 [ + - + - ]: 11672 : MakeAndPushMessage(pfrom, NetMsgType::TX, maybe_with_witness(*tx));
2445 [ + - ]: 11672 : m_mempool.RemoveUnbroadcastTx(tx->GetHash());
2446 : : } else {
2447 [ + - ]: 12 : vNotFound.push_back(inv);
2448 : : }
2449 : 11684 : }
2450 : :
2451 : : // Only process one BLOCK item per call, since they're uncommon and can be
2452 : : // expensive to process.
2453 [ + + + - ]: 44476 : if (it != peer.m_getdata_requests.end() && !pfrom.fPauseSend) {
2454 : 38887 : const CInv &inv = *it++;
2455 [ + + ]: 38887 : if (inv.IsGenBlkMsg()) {
2456 [ + - ]: 38886 : ProcessGetBlockData(pfrom, peer, inv);
2457 : : }
2458 : : // else: If the first item on the queue is an unknown type, we erase it
2459 : : // and continue processing the queue on the next call.
2460 : : // NOTE: previously we wouldn't do so and the peer sending us a malformed GETDATA could
2461 : : // result in never making progress and this thread using 100% allocated CPU. See
2462 : : // https://bitcoincore.org/en/2024/07/03/disclose-getdata-cpu.
2463 : : }
2464 : :
2465 : 44476 : peer.m_getdata_requests.erase(peer.m_getdata_requests.begin(), it);
2466 : :
2467 [ + + ]: 44476 : if (!vNotFound.empty()) {
2468 : : // Let the peer know that we didn't find what it asked for, so it doesn't
2469 : : // have to wait around forever.
2470 : : // SPV clients care about this message: it's needed when they are
2471 : : // recursively walking the dependencies of relevant unconfirmed
2472 : : // transactions. SPV clients want to do that because they want to know
2473 : : // about (and store and rebroadcast and risk analyze) the dependencies
2474 : : // of transactions relevant to them, without having to download the
2475 : : // entire memory pool.
2476 : : // Also, other nodes can use these messages to automatically request a
2477 : : // transaction from some other peer that announced it, and stop
2478 : : // waiting for us to respond.
2479 : : // In normal operation, we often send NOTFOUND messages for parents of
2480 : : // transactions that we relay; if a peer is missing a parent, they may
2481 : : // assume we have them and request the parents from us.
2482 [ + - + - ]: 18 : MakeAndPushMessage(pfrom, NetMsgType::NOTFOUND, vNotFound);
2483 : : }
2484 : 44476 : }
2485 : :
2486 : 41550 : uint32_t PeerManagerImpl::GetFetchFlags(const Peer& peer) const
2487 : : {
2488 : 41550 : uint32_t nFetchFlags = 0;
2489 [ + + ]: 41550 : if (CanServeWitnesses(peer)) {
2490 : 41548 : nFetchFlags |= MSG_WITNESS_FLAG;
2491 : : }
2492 : 41550 : return nFetchFlags;
2493 : : }
2494 : :
2495 : 576 : void PeerManagerImpl::SendBlockTransactions(CNode& pfrom, Peer& peer, const CBlock& block, const BlockTransactionsRequest& req)
2496 : : {
2497 : 576 : BlockTransactions resp(req);
2498 [ + + ]: 2577 : for (size_t i = 0; i < req.indexes.size(); i++) {
2499 [ + + ]: 2002 : if (req.indexes[i] >= block.vtx.size()) {
2500 [ + - + - ]: 1 : Misbehaving(peer, "getblocktxn with out-of-bounds tx indices");
2501 : 1 : return;
2502 : : }
2503 : 2001 : resp.txn[i] = block.vtx[req.indexes[i]];
2504 : : }
2505 : :
2506 [ + - + - ]: 1150 : MakeAndPushMessage(pfrom, NetMsgType::BLOCKTXN, resp);
2507 : 576 : }
2508 : :
2509 : 8825 : bool PeerManagerImpl::CheckHeadersPoW(const std::vector<CBlockHeader>& headers, const Consensus::Params& consensusParams, Peer& peer)
2510 : : {
2511 : : // Do these headers have proof-of-work matching what's claimed?
2512 [ + + ]: 8825 : if (!HasValidProofOfWork(headers, consensusParams)) {
2513 [ + - ]: 1 : Misbehaving(peer, "header with invalid proof of work");
2514 : 1 : return false;
2515 : : }
2516 : :
2517 : : // Are these headers connected to each other?
2518 [ + + ]: 8824 : if (!CheckHeadersAreContinuous(headers)) {
2519 [ + - ]: 1 : Misbehaving(peer, "non-continuous headers sequence");
2520 : 1 : return false;
2521 : : }
2522 : : return true;
2523 : : }
2524 : :
2525 : 66956 : arith_uint256 PeerManagerImpl::GetAntiDoSWorkThreshold()
2526 : : {
2527 : 66956 : arith_uint256 near_chaintip_work = 0;
2528 : 66956 : LOCK(cs_main);
2529 [ + - + - : 66956 : if (m_chainman.ActiveChain().Tip() != nullptr) {
+ - ]
2530 [ + - + - ]: 66956 : const CBlockIndex *tip = m_chainman.ActiveChain().Tip();
2531 : : // Use a 144 block buffer, so that we'll accept headers that fork from
2532 : : // near our tip.
2533 [ + - + - : 803472 : near_chaintip_work = tip->nChainWork - std::min<arith_uint256>(144*GetBlockProof(*tip), tip->nChainWork);
+ - + + ]
2534 : : }
2535 [ + - + - : 133912 : return std::max(near_chaintip_work, m_chainman.MinimumChainWork());
+ - ]
2536 : 66956 : }
2537 : :
2538 : : /**
2539 : : * Special handling for unconnecting headers that might be part of a block
2540 : : * announcement.
2541 : : *
2542 : : * We'll send a getheaders message in response to try to connect the chain.
2543 : : */
2544 : 204 : void PeerManagerImpl::HandleUnconnectingHeaders(CNode& pfrom, Peer& peer,
2545 : : const std::vector<CBlockHeader>& headers)
2546 : : {
2547 : : // Try to fill in the missing headers.
2548 [ + - ]: 408 : const CBlockIndex* best_header{WITH_LOCK(cs_main, return m_chainman.m_best_header)};
2549 [ + - + - ]: 204 : if (MaybeSendGetHeaders(pfrom, GetLocator(best_header), peer)) {
2550 [ + - + - : 408 : LogDebug(BCLog::NET, "received header %s: missing prev block %s, sending getheaders (%d) to end (peer=%d)\n",
+ - + - ]
2551 : : headers[0].GetHash().ToString(),
2552 : : headers[0].hashPrevBlock.ToString(),
2553 : : best_header->nHeight,
2554 : : pfrom.GetId());
2555 : : }
2556 : :
2557 : : // Set hashLastUnknownBlock for this peer, so that if we
2558 : : // eventually get the headers - even from a different peer -
2559 : : // we can use this peer to download.
2560 [ + - + - ]: 612 : WITH_LOCK(cs_main, UpdateBlockAvailability(pfrom.GetId(), headers.back().GetHash()));
2561 : 204 : }
2562 : :
2563 : 8824 : bool PeerManagerImpl::CheckHeadersAreContinuous(const std::vector<CBlockHeader>& headers) const
2564 : : {
2565 : 8824 : uint256 hashLastBlock;
2566 [ + + ]: 295354 : for (const CBlockHeader& header : headers) {
2567 [ + + + + ]: 286531 : if (!hashLastBlock.IsNull() && header.hashPrevBlock != hashLastBlock) {
2568 : : return false;
2569 : : }
2570 : 286530 : hashLastBlock = header.GetHash();
2571 : : }
2572 : : return true;
2573 : : }
2574 : :
2575 : 8828 : bool PeerManagerImpl::IsContinuationOfLowWorkHeadersSync(Peer& peer, CNode& pfrom, std::vector<CBlockHeader>& headers)
2576 : : {
2577 [ + + ]: 8828 : if (peer.m_headers_sync) {
2578 : 19 : auto result = peer.m_headers_sync->ProcessNextHeaders(headers, headers.size() == m_opts.max_headers_result);
2579 : : // If it is a valid continuation, we should treat the existing getheaders request as responded to.
2580 [ + - ]: 19 : if (result.success) peer.m_last_getheaders_timestamp = {};
2581 [ + + ]: 19 : if (result.request_more) {
2582 [ + - ]: 15 : auto locator = peer.m_headers_sync->NextHeadersRequestLocator();
2583 : : // If we were instructed to ask for a locator, it should not be empty.
2584 : 15 : Assume(!locator.vHave.empty());
2585 : : // We can only be instructed to request more if processing was successful.
2586 : 15 : Assume(result.success);
2587 [ + - ]: 15 : if (!locator.vHave.empty()) {
2588 : : // It should be impossible for the getheaders request to fail,
2589 : : // because we just cleared the last getheaders timestamp.
2590 [ + - ]: 15 : bool sent_getheaders = MaybeSendGetHeaders(pfrom, locator, peer);
2591 : 15 : Assume(sent_getheaders);
2592 [ + - + - : 30 : LogDebug(BCLog::NET, "more getheaders (from %s) to peer=%d\n",
+ - + - ]
2593 : : locator.vHave.front().ToString(), pfrom.GetId());
2594 : : }
2595 : 15 : }
2596 : :
2597 [ + + ]: 19 : if (peer.m_headers_sync->GetState() == HeadersSyncState::State::FINAL) {
2598 [ + - ]: 4 : peer.m_headers_sync.reset(nullptr);
2599 : :
2600 : : // Delete this peer's entry in m_headers_presync_stats.
2601 : : // If this is m_headers_presync_bestpeer, it will be replaced later
2602 : : // by the next peer that triggers the else{} branch below.
2603 [ + - ]: 4 : LOCK(m_headers_presync_mutex);
2604 [ + - ]: 4 : m_headers_presync_stats.erase(pfrom.GetId());
2605 : 4 : } else {
2606 : : // Build statistics for this peer's sync.
2607 : 15 : HeadersPresyncStats stats;
2608 [ + + ]: 150 : stats.first = peer.m_headers_sync->GetPresyncWork();
2609 [ + + ]: 15 : if (peer.m_headers_sync->GetState() == HeadersSyncState::State::PRESYNC) {
2610 [ - + ]: 7 : stats.second = {peer.m_headers_sync->GetPresyncHeight(),
2611 [ - + ]: 7 : peer.m_headers_sync->GetPresyncTime()};
2612 : : }
2613 : :
2614 : : // Update statistics in stats.
2615 [ + - ]: 15 : LOCK(m_headers_presync_mutex);
2616 [ + - ]: 15 : m_headers_presync_stats[pfrom.GetId()] = stats;
2617 : 15 : auto best_it = m_headers_presync_stats.find(m_headers_presync_bestpeer);
2618 : 15 : bool best_updated = false;
2619 [ + + ]: 15 : if (best_it == m_headers_presync_stats.end()) {
2620 : : // If the cached best peer is outdated, iterate over all remaining ones (including
2621 : : // newly updated one) to find the best one.
2622 : 4 : NodeId peer_best{-1};
2623 : 4 : const HeadersPresyncStats* stat_best{nullptr};
2624 [ - + + + ]: 8 : for (const auto& [peer, stat] : m_headers_presync_stats) {
2625 [ - + - - : 4 : if (!stat_best || stat > *stat_best) {
- - ]
2626 : 4 : peer_best = peer;
2627 : 4 : stat_best = &stat;
2628 : : }
2629 : : }
2630 : 4 : m_headers_presync_bestpeer = peer_best;
2631 [ + - ]: 4 : best_updated = (peer_best == pfrom.GetId());
2632 [ - + - - : 11 : } else if (best_it->first == pfrom.GetId() || stats > best_it->second) {
- - ]
2633 : : // pfrom was and remains the best peer, or pfrom just became best.
2634 : 11 : m_headers_presync_bestpeer = pfrom.GetId();
2635 : 11 : best_updated = true;
2636 : : }
2637 [ + - + + ]: 15 : if (best_updated && stats.second.has_value()) {
2638 : : // If the best peer updated, and it is in its first phase, signal.
2639 : 7 : m_headers_presync_should_signal = true;
2640 : : }
2641 : 15 : }
2642 : :
2643 [ + - ]: 19 : if (result.success) {
2644 : : // We only overwrite the headers passed in if processing was
2645 : : // successful.
2646 : 19 : headers.swap(result.pow_validated_headers);
2647 : : }
2648 : :
2649 : 19 : return result.success;
2650 : 19 : }
2651 : : // Either we didn't have a sync in progress, or something went wrong
2652 : : // processing these headers, or we are returning headers to the caller to
2653 : : // process.
2654 : : return false;
2655 : : }
2656 : :
2657 : 1960 : bool PeerManagerImpl::TryLowWorkHeadersSync(Peer& peer, CNode& pfrom, const CBlockIndex* chain_start_header, std::vector<CBlockHeader>& headers)
2658 : : {
2659 : : // Calculate the claimed total work on this chain.
2660 : 1960 : arith_uint256 total_work = chain_start_header->nChainWork + CalculateClaimedHeadersWork(headers);
2661 : :
2662 : : // Our dynamic anti-DoS threshold (minimum work required on a headers chain
2663 : : // before we'll store it)
2664 : 1960 : arith_uint256 minimum_chain_work = GetAntiDoSWorkThreshold();
2665 : :
2666 : : // Avoid DoS via low-difficulty-headers by only processing if the headers
2667 : : // are part of a chain with sufficient work.
2668 [ + + ]: 1960 : if (total_work < minimum_chain_work) {
2669 : : // Only try to sync with this peer if their headers message was full;
2670 : : // otherwise they don't have more headers after this so no point in
2671 : : // trying to sync their too-little-work chain.
2672 [ + + ]: 206 : if (headers.size() == m_opts.max_headers_result) {
2673 : : // Note: we could advance to the last header in this set that is
2674 : : // known to us, rather than starting at the first header (which we
2675 : : // may already have); however this is unlikely to matter much since
2676 : : // ProcessHeadersMessage() already handles the case where all
2677 : : // headers in a received message are already known and are
2678 : : // ancestors of m_best_header or chainActive.Tip(), by skipping
2679 : : // this logic in that case. So even if the first header in this set
2680 : : // of headers is known, some header in this set must be new, so
2681 : : // advancing to the first unknown header would be a small effect.
2682 : 5 : LOCK(peer.m_headers_sync_mutex);
2683 [ + - - + ]: 5 : peer.m_headers_sync.reset(new HeadersSyncState(peer.m_id, m_chainparams.GetConsensus(),
2684 [ + - + - ]: 5 : chain_start_header, minimum_chain_work));
2685 : :
2686 : : // Now a HeadersSyncState object for tracking this synchronization
2687 : : // is created, process the headers using it as normal. Failures are
2688 : : // handled inside of IsContinuationOfLowWorkHeadersSync.
2689 [ + - ]: 5 : (void)IsContinuationOfLowWorkHeadersSync(peer, pfrom, headers);
2690 : 5 : } else {
2691 [ + - ]: 201 : LogDebug(BCLog::NET, "Ignoring low-work chain (height=%u) from peer=%d\n", chain_start_header->nHeight + headers.size(), pfrom.GetId());
2692 : : }
2693 : :
2694 : : // The peer has not yet given us a chain that meets our work threshold,
2695 : : // so we want to prevent further processing of the headers in any case.
2696 : 206 : headers = {};
2697 : 206 : return true;
2698 : : }
2699 : :
2700 : : return false;
2701 : : }
2702 : :
2703 : 8608 : bool PeerManagerImpl::IsAncestorOfBestHeaderOrTip(const CBlockIndex* header)
2704 : : {
2705 [ + + ]: 8608 : if (header == nullptr) {
2706 : : return false;
2707 [ + - + + ]: 5843 : } else if (m_chainman.m_best_header != nullptr && header == m_chainman.m_best_header->GetAncestor(header->nHeight)) {
2708 : : return true;
2709 [ - + ]: 15 : } else if (m_chainman.ActiveChain().Contains(header)) {
2710 : 0 : return true;
2711 : : }
2712 : : return false;
2713 : : }
2714 : :
2715 : 2485 : bool PeerManagerImpl::MaybeSendGetHeaders(CNode& pfrom, const CBlockLocator& locator, Peer& peer)
2716 : : {
2717 : 2485 : const auto current_time = NodeClock::now();
2718 : :
2719 : : // Only allow a new getheaders message to go out if we don't have a recent
2720 : : // one already in-flight
2721 [ + + ]: 2485 : if (current_time - peer.m_last_getheaders_timestamp > HEADERS_RESPONSE_TIME) {
2722 [ + - ]: 2256 : MakeAndPushMessage(pfrom, NetMsgType::GETHEADERS, locator, uint256());
2723 : 2256 : peer.m_last_getheaders_timestamp = current_time;
2724 : 2256 : return true;
2725 : : }
2726 : : return false;
2727 : : }
2728 : :
2729 : : /*
2730 : : * Given a new headers tip ending in last_header, potentially request blocks towards that tip.
2731 : : * We require that the given tip have at least as much work as our tip, and for
2732 : : * our current tip to be "close to synced" (see CanDirectFetch()).
2733 : : */
2734 : 8329 : void PeerManagerImpl::HeadersDirectFetchBlocks(CNode& pfrom, const Peer& peer, const CBlockIndex& last_header)
2735 : : {
2736 : 8329 : LOCK(cs_main);
2737 : 8329 : CNodeState *nodestate = State(pfrom.GetId());
2738 : :
2739 [ + - + + : 30564 : if (CanDirectFetch() && last_header.IsValid(BLOCK_VALID_TREE) && m_chainman.ActiveChain().Tip()->nChainWork <= last_header.nChainWork) {
+ - + - +
- + - + +
+ - ]
2740 : 6911 : std::vector<const CBlockIndex*> vToFetch;
2741 : 6911 : const CBlockIndex* pindexWalk{&last_header};
2742 : : // Calculate all the blocks we'd need to switch to last_header, up to a limit.
2743 [ + - + - : 81308 : while (pindexWalk && !m_chainman.ActiveChain().Contains(pindexWalk) && vToFetch.size() <= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
+ + + + ]
2744 [ + + ]: 67760 : if (!(pindexWalk->nStatus & BLOCK_HAVE_DATA) &&
2745 [ + + + + ]: 129622 : !IsBlockRequested(pindexWalk->GetBlockHash()) &&
2746 [ + + ]: 109871 : (!DeploymentActiveAt(*pindexWalk, m_chainman, Consensus::DEPLOYMENT_SEGWIT) || CanServeWitnesses(peer))) {
2747 : : // We don't have this block, and it's not yet in flight.
2748 [ + - ]: 55224 : vToFetch.push_back(pindexWalk);
2749 : : }
2750 : 74397 : pindexWalk = pindexWalk->pprev;
2751 : : }
2752 : : // If pindexWalk still isn't on our main chain, we're looking at a
2753 : : // very large reorg at a time we think we're close to caught up to
2754 : : // the main chain -- this shouldn't really happen. Bail out on the
2755 : : // direct fetch and rely on parallel download instead.
2756 [ + - + + ]: 6911 : if (!m_chainman.ActiveChain().Contains(pindexWalk)) {
2757 [ + - + - : 5886 : LogDebug(BCLog::NET, "Large reorg, won't direct fetch to %s (%d)\n",
+ - + - ]
2758 : : last_header.GetBlockHash().ToString(),
2759 : : last_header.nHeight);
2760 : : } else {
2761 : 3968 : std::vector<CInv> vGetData;
2762 : : // Download as much as possible, from earliest to latest.
2763 [ + + ]: 7547 : for (const CBlockIndex* pindex : vToFetch | std::views::reverse) {
2764 [ + + ]: 3816 : if (nodestate->vBlocksInFlight.size() >= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
2765 : : // Can't download any more from this peer
2766 : : break;
2767 : : }
2768 : 3579 : uint32_t nFetchFlags = GetFetchFlags(peer);
2769 [ + - ]: 3579 : vGetData.emplace_back(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash());
2770 [ + - ]: 3579 : BlockRequested(pfrom.GetId(), *pindex);
2771 [ + - + - : 7158 : LogDebug(BCLog::NET, "Requesting block %s from peer=%d\n",
+ - + - ]
2772 : : pindex->GetBlockHash().ToString(), pfrom.GetId());
2773 : : }
2774 [ + + ]: 3968 : if (vGetData.size() > 1) {
2775 [ + - + - : 1224 : LogDebug(BCLog::NET, "Downloading blocks toward %s (%d) via headers direct fetch\n",
+ - + - ]
2776 : : last_header.GetBlockHash().ToString(),
2777 : : last_header.nHeight);
2778 : : }
2779 [ + + ]: 3968 : if (vGetData.size() > 0) {
2780 : 4733 : if (!m_opts.ignore_incoming_txs &&
2781 [ + + ]: 2366 : nodestate->m_provides_cmpctblocks &&
2782 [ + + + + ]: 2112 : vGetData.size() == 1 &&
2783 [ + + + + ]: 4000 : mapBlocksInFlight.size() == 1 &&
2784 [ + - + + ]: 358 : last_header.pprev->IsValid(BLOCK_VALID_CHAIN)) {
2785 : : // In any case, we want to download using a compact block, not a regular one
2786 [ + - ]: 354 : vGetData[0] = CInv(MSG_CMPCT_BLOCK, vGetData[0].hash);
2787 : : }
2788 [ + - + - ]: 4734 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, vGetData);
2789 : : }
2790 : 3968 : }
2791 : 6911 : }
2792 : 8329 : }
2793 : :
2794 : : /**
2795 : : * Given receipt of headers from a peer ending in last_header, along with
2796 : : * whether that header was new and whether the headers message was full,
2797 : : * update the state we keep for the peer.
2798 : : */
2799 : 8329 : void PeerManagerImpl::UpdatePeerStateForReceivedHeaders(CNode& pfrom, Peer& peer,
2800 : : const CBlockIndex& last_header, bool received_new_header, bool may_have_more_headers)
2801 : : {
2802 : 8329 : LOCK(cs_main);
2803 : 8329 : CNodeState *nodestate = State(pfrom.GetId());
2804 : :
2805 [ + - ]: 8329 : UpdateBlockAvailability(pfrom.GetId(), last_header.GetBlockHash());
2806 : :
2807 : : // From here, pindexBestKnownBlock should be guaranteed to be non-null,
2808 : : // because it is set in UpdateBlockAvailability. Some nullptr checks
2809 : : // are still present, however, as belt-and-suspenders.
2810 : :
2811 [ + + + - : 10819 : if (received_new_header && last_header.nChainWork > m_chainman.ActiveChain().Tip()->nChainWork) {
+ - + - +
+ ]
2812 [ + - ]: 2419 : nodestate->m_last_block_announcement = GetTime();
2813 : : }
2814 : :
2815 : : // If we're in IBD, we want outbound peers that will serve us a useful
2816 : : // chain. Disconnect peers that are on chains with insufficient work.
2817 [ + - + + : 8329 : if (m_chainman.IsInitialBlockDownload() && !may_have_more_headers) {
+ + ]
2818 : : // If the peer has no more headers to give us, then we know we have
2819 : : // their tip.
2820 [ + - + - : 548 : if (nodestate->pindexBestKnownBlock && nodestate->pindexBestKnownBlock->nChainWork < m_chainman.MinimumChainWork()) {
+ - + + ]
2821 : : // This peer has too little work on their headers chain to help
2822 : : // us sync -- disconnect if it is an outbound disconnection
2823 : : // candidate.
2824 : : // Note: We compare their tip to the minimum chain work (rather than
2825 : : // m_chainman.ActiveChain().Tip()) because we won't start block download
2826 : : // until we have a headers chain that has at least
2827 : : // the minimum chain work, even if a peer has a chain past our tip,
2828 : : // as an anti-DoS measure.
2829 [ - + ]: 146 : if (pfrom.IsOutboundOrBlockRelayConn()) {
2830 [ # # # # ]: 0 : LogInfo("outbound peer headers chain has insufficient work, %s\n", pfrom.DisconnectMsg(fLogIPs));
2831 : 0 : pfrom.fDisconnect = true;
2832 : : }
2833 : : }
2834 : : }
2835 : :
2836 : : // If this is an outbound full-relay peer, check to see if we should protect
2837 : : // it from the bad/lagging chain logic.
2838 : : // Note that outbound block-relay peers are excluded from this protection, and
2839 : : // thus always subject to eviction under the bad/lagging chain logic.
2840 : : // See ChainSyncTimeoutState.
2841 [ + - + + : 8329 : if (!pfrom.fDisconnect && pfrom.IsFullOutboundConn() && nodestate->pindexBestKnownBlock != nullptr) {
+ - ]
2842 [ + + + - : 63 : if (m_outbound_peers_with_protect_from_disconnect < MAX_OUTBOUND_PEERS_TO_PROTECT_FROM_DISCONNECT && nodestate->pindexBestKnownBlock->nChainWork >= m_chainman.ActiveChain().Tip()->nChainWork && !nodestate->m_chain_sync.m_protect) {
+ - + - +
+ + - ]
2843 [ + - + - : 14 : LogDebug(BCLog::NET, "Protecting outbound peer=%d from eviction\n", pfrom.GetId());
+ - ]
2844 : 14 : nodestate->m_chain_sync.m_protect = true;
2845 : 14 : ++m_outbound_peers_with_protect_from_disconnect;
2846 : : }
2847 : : }
2848 : 8329 : }
2849 : :
2850 : 9196 : void PeerManagerImpl::ProcessHeadersMessage(CNode& pfrom, Peer& peer,
2851 : : std::vector<CBlockHeader>&& headers,
2852 : : bool via_compact_block)
2853 : : {
2854 [ + + ]: 9196 : size_t nCount = headers.size();
2855 : :
2856 [ + + ]: 9196 : if (nCount == 0) {
2857 : : // Nothing interesting. Stop asking this peers for more headers.
2858 : : // If we were in the middle of headers sync, receiving an empty headers
2859 : : // message suggests that the peer suddenly has nothing to give us
2860 : : // (perhaps it reorged to our chain). Clear download state for this peer.
2861 : 371 : LOCK(peer.m_headers_sync_mutex);
2862 [ - + ]: 371 : if (peer.m_headers_sync) {
2863 : 0 : peer.m_headers_sync.reset(nullptr);
2864 [ # # ]: 0 : LOCK(m_headers_presync_mutex);
2865 [ # # ]: 0 : m_headers_presync_stats.erase(pfrom.GetId());
2866 : 0 : }
2867 : : // A headers message with no headers cannot be an announcement, so assume
2868 : : // it is a response to our last getheaders request, if there is one.
2869 [ + - ]: 371 : peer.m_last_getheaders_timestamp = {};
2870 [ + - ]: 371 : return;
2871 : 371 : }
2872 : :
2873 : : // Before we do any processing, make sure these pass basic sanity checks.
2874 : : // We'll rely on headers having valid proof-of-work further down, as an
2875 : : // anti-DoS criteria (note: this check is required before passing any
2876 : : // headers into HeadersSyncState).
2877 [ + + ]: 8825 : if (!CheckHeadersPoW(headers, m_chainparams.GetConsensus(), peer)) {
2878 : : // Misbehaving() calls are handled within CheckHeadersPoW(), so we can
2879 : : // just return. (Note that even if a header is announced via compact
2880 : : // block, the header itself should be valid, so this type of error can
2881 : : // always be punished.)
2882 : : return;
2883 : : }
2884 : :
2885 : 8823 : const CBlockIndex *pindexLast = nullptr;
2886 : :
2887 : : // We'll set already_validated_work to true if these headers are
2888 : : // successfully processed as part of a low-work headers sync in progress
2889 : : // (either in PRESYNC or REDOWNLOAD phase).
2890 : : // If true, this will mean that any headers returned to us (ie during
2891 : : // REDOWNLOAD) can be validated without further anti-DoS checks.
2892 : 8823 : bool already_validated_work = false;
2893 : :
2894 : : // If we're in the middle of headers sync, let it do its magic.
2895 : 8823 : bool have_headers_sync = false;
2896 : 8823 : {
2897 : 8823 : LOCK(peer.m_headers_sync_mutex);
2898 : :
2899 [ + - ]: 8823 : already_validated_work = IsContinuationOfLowWorkHeadersSync(peer, pfrom, headers);
2900 : :
2901 : : // The headers we passed in may have been:
2902 : : // - untouched, perhaps if no headers-sync was in progress, or some
2903 : : // failure occurred
2904 : : // - erased, such as if the headers were successfully processed and no
2905 : : // additional headers processing needs to take place (such as if we
2906 : : // are still in PRESYNC)
2907 : : // - replaced with headers that are now ready for validation, such as
2908 : : // during the REDOWNLOAD phase of a low-work headers sync.
2909 : : // So just check whether we still have headers that we need to process,
2910 : : // or not.
2911 [ + + ]: 8823 : if (headers.empty()) {
2912 [ + - ]: 11 : return;
2913 : : }
2914 : :
2915 [ + - ]: 8812 : have_headers_sync = !!peer.m_headers_sync;
2916 : 11 : }
2917 : :
2918 : : // Do these headers connect to something in our block index?
2919 [ + - + - ]: 26436 : const CBlockIndex *chain_start_header{WITH_LOCK(::cs_main, return m_chainman.m_blockman.LookupBlockIndex(headers[0].hashPrevBlock))};
2920 : 8812 : bool headers_connect_blockindex{chain_start_header != nullptr};
2921 : :
2922 [ + + ]: 8812 : if (!headers_connect_blockindex) {
2923 : : // This could be a BIP 130 block announcement, use
2924 : : // special logic for handling headers that don't connect, as this
2925 : : // could be benign.
2926 : 204 : HandleUnconnectingHeaders(pfrom, peer, headers);
2927 : 204 : return;
2928 : : }
2929 : :
2930 : : // If headers connect, assume that this is in response to any outstanding getheaders
2931 : : // request we may have sent, and clear out the time of our last request. Non-connecting
2932 : : // headers cannot be a response to a getheaders request.
2933 : 8608 : peer.m_last_getheaders_timestamp = {};
2934 : :
2935 : : // If the headers we received are already in memory and an ancestor of
2936 : : // m_best_header or our tip, skip anti-DoS checks. These headers will not
2937 : : // use any more memory (and we are not leaking information that could be
2938 : : // used to fingerprint us).
2939 : 8608 : const CBlockIndex *last_received_header{nullptr};
2940 : 8608 : {
2941 : 8608 : LOCK(cs_main);
2942 [ + - + - ]: 8608 : last_received_header = m_chainman.m_blockman.LookupBlockIndex(headers.back().GetHash());
2943 [ + - + + ]: 8608 : if (IsAncestorOfBestHeaderOrTip(last_received_header)) {
2944 : 5828 : already_validated_work = true;
2945 : : }
2946 : 0 : }
2947 : :
2948 : : // If our peer has NetPermissionFlags::NoBan privileges, then bypass our
2949 : : // anti-DoS logic (this saves bandwidth when we connect to a trusted peer
2950 : : // on startup).
2951 [ + + ]: 8608 : if (pfrom.HasPermission(NetPermissionFlags::NoBan)) {
2952 : : already_validated_work = true;
2953 : : }
2954 : :
2955 : : // At this point, the headers connect to something in our block index.
2956 : : // Do anti-DoS checks to determine if we should process or store for later
2957 : : // processing.
2958 [ + + + + ]: 6160 : if (!already_validated_work && TryLowWorkHeadersSync(peer, pfrom,
2959 : : chain_start_header, headers)) {
2960 : : // If we successfully started a low-work headers sync, then there
2961 : : // should be no headers to process any further.
2962 : : Assume(headers.empty());
2963 : : return;
2964 : : }
2965 : :
2966 : : // At this point, we have a set of headers with sufficient work on them
2967 : : // which can be processed.
2968 : :
2969 : : // If we don't have the last header, then this peer will have given us
2970 : : // something new (if these headers are valid).
2971 : 8402 : bool received_new_header{last_received_header == nullptr};
2972 : :
2973 : : // Now process all the headers.
2974 [ + - ]: 8402 : BlockValidationState state;
2975 [ + - ]: 8402 : const bool processed{m_chainman.ProcessNewBlockHeaders(headers,
2976 : : /*min_pow_checked=*/true,
2977 : : state, &pindexLast)};
2978 [ + + ]: 8402 : if (!processed) {
2979 [ + - ]: 73 : if (state.IsInvalid()) {
2980 [ + - + - ]: 73 : MaybePunishNodeForBlock(pfrom.GetId(), state, via_compact_block, "invalid header received");
2981 : 73 : return;
2982 : : }
2983 : : }
2984 [ - + ]: 8329 : assert(pindexLast);
2985 : :
2986 [ + + ]: 8329 : if (processed && received_new_header) {
2987 [ + - ]: 2490 : LogBlockHeader(*pindexLast, pfrom, /*via_compact_block=*/false);
2988 : : }
2989 : :
2990 : : // Consider fetching more headers if we are not using our headers-sync mechanism.
2991 [ + + + - ]: 8329 : if (nCount == m_opts.max_headers_result && !have_headers_sync) {
2992 : : // Headers message had its maximum size; the peer may have more headers.
2993 [ + - + - : 16 : if (MaybeSendGetHeaders(pfrom, GetLocator(pindexLast), peer)) {
+ - ]
2994 [ + - + - : 16 : LogDebug(BCLog::NET, "more getheaders (%d) to end to peer=%d (startheight:%d)\n",
+ - ]
2995 : : pindexLast->nHeight, pfrom.GetId(), peer.m_starting_height);
2996 : : }
2997 : : }
2998 : :
2999 [ + - ]: 8329 : UpdatePeerStateForReceivedHeaders(pfrom, peer, *pindexLast, received_new_header, nCount == m_opts.max_headers_result);
3000 : :
3001 : : // Consider immediately downloading blocks.
3002 [ + - ]: 8329 : HeadersDirectFetchBlocks(pfrom, peer, *pindexLast);
3003 : :
3004 : : return;
3005 : 8402 : }
3006 : :
3007 : 563 : std::optional<node::PackageToValidate> PeerManagerImpl::ProcessInvalidTx(NodeId nodeid, const CTransactionRef& ptx, const TxValidationState& state,
3008 : : bool first_time_failure)
3009 : : {
3010 : 563 : AssertLockNotHeld(m_peer_mutex);
3011 : 563 : AssertLockHeld(g_msgproc_mutex);
3012 : 563 : AssertLockHeld(m_tx_download_mutex);
3013 : :
3014 : 563 : PeerRef peer{GetPeerRef(nodeid)};
3015 : :
3016 [ + - + - : 1126 : LogDebug(BCLog::MEMPOOLREJ, "%s (wtxid=%s) from peer=%d was not accepted: %s\n",
+ - + - +
- + - ]
3017 : : ptx->GetHash().ToString(),
3018 : : ptx->GetWitnessHash().ToString(),
3019 : : nodeid,
3020 : : state.ToString());
3021 : :
3022 [ + - ]: 563 : const auto& [add_extra_compact_tx, unique_parents, package_to_validate] = m_txdownloadman.MempoolRejectedTx(ptx, state, nodeid, first_time_failure);
3023 : :
3024 [ + + + + ]: 563 : if (add_extra_compact_tx && RecursiveDynamicUsage(*ptx) < 100000) {
3025 [ + - ]: 547 : AddToCompactExtraTransactions(ptx);
3026 : : }
3027 [ + + ]: 954 : for (const Txid& parent_txid : unique_parents) {
3028 [ + - + - ]: 391 : if (peer) AddKnownTx(*peer, parent_txid);
3029 : : }
3030 : :
3031 [ + - ]: 563 : MaybePunishNodeForTx(nodeid, state);
3032 : :
3033 [ + - ]: 563 : return package_to_validate;
3034 [ + - ]: 1126 : }
3035 : :
3036 : 11299 : void PeerManagerImpl::ProcessValidTx(NodeId nodeid, const CTransactionRef& tx, const std::list<CTransactionRef>& replaced_transactions)
3037 : : {
3038 : 11299 : AssertLockNotHeld(m_peer_mutex);
3039 : 11299 : AssertLockHeld(g_msgproc_mutex);
3040 : 11299 : AssertLockHeld(m_tx_download_mutex);
3041 : :
3042 : 11299 : m_txdownloadman.MempoolAcceptedTx(tx);
3043 : :
3044 [ + - + - : 22598 : LogDebug(BCLog::MEMPOOL, "AcceptToMemoryPool: peer=%d: accepted %s (wtxid=%s) (poolsz %u txn, %u kB)\n",
+ - ]
3045 : : nodeid,
3046 : : tx->GetHash().ToString(),
3047 : : tx->GetWitnessHash().ToString(),
3048 : : m_mempool.size(), m_mempool.DynamicMemoryUsage() / 1000);
3049 : :
3050 : 11299 : RelayTransaction(tx->GetHash(), tx->GetWitnessHash());
3051 : :
3052 [ + + ]: 11788 : for (const CTransactionRef& removedTx : replaced_transactions) {
3053 : 489 : AddToCompactExtraTransactions(removedTx);
3054 : : }
3055 : 11299 : }
3056 : :
3057 : 25 : void PeerManagerImpl::ProcessPackageResult(const node::PackageToValidate& package_to_validate, const PackageMempoolAcceptResult& package_result)
3058 : : {
3059 : 25 : AssertLockNotHeld(m_peer_mutex);
3060 : 25 : AssertLockHeld(g_msgproc_mutex);
3061 : 25 : AssertLockHeld(m_tx_download_mutex);
3062 : :
3063 : 25 : const auto& package = package_to_validate.m_txns;
3064 : 25 : const auto& senders = package_to_validate.m_senders;
3065 : :
3066 [ + + ]: 25 : if (package_result.m_state.IsInvalid()) {
3067 : 4 : m_txdownloadman.MempoolRejectedPackage(package);
3068 : : }
3069 : : // We currently only expect to process 1-parent-1-child packages. Remove if this changes.
3070 [ + - ]: 25 : if (!Assume(package.size() == 2)) return;
3071 : :
3072 : : // Iterate backwards to erase in-package descendants from the orphanage before they become
3073 : : // relevant in AddChildrenToWorkSet.
3074 : 25 : auto package_iter = package.rbegin();
3075 : 25 : auto senders_iter = senders.rbegin();
3076 [ + + ]: 75 : while (package_iter != package.rend()) {
3077 : 50 : const auto& tx = *package_iter;
3078 : 50 : const NodeId nodeid = *senders_iter;
3079 : 50 : const auto it_result{package_result.m_tx_results.find(tx->GetWitnessHash())};
3080 : :
3081 : : // It is not guaranteed that a result exists for every transaction.
3082 [ + + ]: 50 : if (it_result != package_result.m_tx_results.end()) {
3083 [ + + - ]: 48 : const auto& tx_result = it_result->second;
3084 [ + + - ]: 48 : switch (tx_result.m_result_type) {
3085 : 42 : case MempoolAcceptResult::ResultType::VALID:
3086 : 42 : {
3087 : 42 : ProcessValidTx(nodeid, tx, tx_result.m_replaced_transactions);
3088 : 42 : break;
3089 : : }
3090 : 6 : case MempoolAcceptResult::ResultType::INVALID:
3091 : 6 : case MempoolAcceptResult::ResultType::DIFFERENT_WITNESS:
3092 : 6 : {
3093 : : // Don't add to vExtraTxnForCompact, as these transactions should have already been
3094 : : // added there when added to the orphanage or rejected for TX_RECONSIDERABLE.
3095 : : // This should be updated if package submission is ever used for transactions
3096 : : // that haven't already been validated before.
3097 [ - + ]: 6 : ProcessInvalidTx(nodeid, tx, tx_result.m_state, /*first_time_failure=*/false);
3098 : 6 : break;
3099 : : }
3100 : : case MempoolAcceptResult::ResultType::MEMPOOL_ENTRY:
3101 : : {
3102 : : // AlreadyHaveTx() should be catching transactions that are already in mempool.
3103 : : Assume(false);
3104 : : break;
3105 : : }
3106 : : }
3107 : : }
3108 : 50 : package_iter++;
3109 : 50 : senders_iter++;
3110 : : }
3111 : : }
3112 : :
3113 : : // NOTE: the orphan processing used to be uninterruptible and quadratic, which could allow a peer to stall the node for
3114 : : // hours with specially crafted transactions. See https://bitcoincore.org/en/2024/07/03/disclose-orphan-dos.
3115 : 377784 : bool PeerManagerImpl::ProcessOrphanTx(Peer& peer)
3116 : : {
3117 : 377784 : AssertLockHeld(g_msgproc_mutex);
3118 [ + - ]: 377784 : LOCK2(::cs_main, m_tx_download_mutex);
3119 : :
3120 : 377784 : CTransactionRef porphanTx = nullptr;
3121 : :
3122 [ + - + + ]: 377785 : while (CTransactionRef porphanTx = m_txdownloadman.GetTxToReconsider(peer.m_id)) {
3123 [ + - ]: 123 : const MempoolAcceptResult result = m_chainman.ProcessTransaction(porphanTx);
3124 : 123 : const TxValidationState& state = result.m_state;
3125 [ + + ]: 123 : const Txid& orphanHash = porphanTx->GetHash();
3126 [ + + ]: 123 : const Wtxid& orphan_wtxid = porphanTx->GetWitnessHash();
3127 : :
3128 [ + + ]: 123 : if (result.m_result_type == MempoolAcceptResult::ResultType::VALID) {
3129 [ + - + - : 230 : LogDebug(BCLog::TXPACKAGES, " accepted orphan tx %s (wtxid=%s)\n", orphanHash.ToString(), orphan_wtxid.ToString());
+ - + - +
- ]
3130 [ + - ]: 115 : ProcessValidTx(peer.m_id, porphanTx, result.m_replaced_transactions);
3131 : : return true;
3132 [ + + ]: 8 : } else if (state.GetResult() != TxValidationResult::TX_MISSING_INPUTS) {
3133 [ + - + - : 14 : LogDebug(BCLog::TXPACKAGES, " invalid orphan tx %s (wtxid=%s) from peer=%d. %s\n",
+ - + - +
- + - ]
3134 : : orphanHash.ToString(),
3135 : : orphan_wtxid.ToString(),
3136 : : peer.m_id,
3137 : : state.ToString());
3138 : :
3139 [ + - + - : 7 : if (Assume(state.IsInvalid() &&
+ - + - ]
3140 : : state.GetResult() != TxValidationResult::TX_UNKNOWN &&
3141 : : state.GetResult() != TxValidationResult::TX_NO_MEMPOOL &&
3142 : : state.GetResult() != TxValidationResult::TX_RESULT_UNSET)) {
3143 [ + - ]: 14 : ProcessInvalidTx(peer.m_id, porphanTx, state, /*first_time_failure=*/false);
3144 : : }
3145 : 7 : return true;
3146 : : }
3147 [ + - + - ]: 246 : }
3148 : :
3149 : 377662 : return false;
3150 [ + - + - : 1133352 : }
- - ]
3151 : :
3152 : 15 : bool PeerManagerImpl::PrepareBlockFilterRequest(CNode& node, Peer& peer,
3153 : : BlockFilterType filter_type, uint32_t start_height,
3154 : : const uint256& stop_hash, uint32_t max_height_diff,
3155 : : const CBlockIndex*& stop_index,
3156 : : BlockFilterIndex*& filter_index)
3157 : : {
3158 : 30 : const bool supported_filter_type =
3159 [ + + ]: 15 : (filter_type == BlockFilterType::BASIC &&
3160 [ + + ]: 14 : (peer.m_our_services & NODE_COMPACT_FILTERS));
3161 : 15 : if (!supported_filter_type) {
3162 [ + - + - ]: 8 : LogDebug(BCLog::NET, "peer requested unsupported block filter type: %d, %s\n",
3163 : : static_cast<uint8_t>(filter_type), node.DisconnectMsg(fLogIPs));
3164 : 4 : node.fDisconnect = true;
3165 : 4 : return false;
3166 : : }
3167 : :
3168 : 11 : {
3169 : 11 : LOCK(cs_main);
3170 [ + - ]: 11 : stop_index = m_chainman.m_blockman.LookupBlockIndex(stop_hash);
3171 : :
3172 : : // Check that the stop block exists and the peer would be allowed to fetch it.
3173 [ + + + - : 11 : if (!stop_index || !BlockRequestAllowed(stop_index)) {
+ - ]
3174 [ + - + - : 2 : LogDebug(BCLog::NET, "peer requested invalid block hash: %s, %s\n",
+ - + - +
- ]
3175 : : stop_hash.ToString(), node.DisconnectMsg(fLogIPs));
3176 [ + - ]: 1 : node.fDisconnect = true;
3177 [ + - ]: 1 : return false;
3178 : : }
3179 : 1 : }
3180 : :
3181 : 10 : uint32_t stop_height = stop_index->nHeight;
3182 [ + + ]: 10 : if (start_height > stop_height) {
3183 [ + - + - ]: 2 : LogDebug(BCLog::NET, "peer sent invalid getcfilters/getcfheaders with "
3184 : : "start height %d and stop height %d, %s\n",
3185 : : start_height, stop_height, node.DisconnectMsg(fLogIPs));
3186 : 1 : node.fDisconnect = true;
3187 : 1 : return false;
3188 : : }
3189 [ + + ]: 9 : if (stop_height - start_height >= max_height_diff) {
3190 [ + - + - ]: 4 : LogDebug(BCLog::NET, "peer requested too many cfilters/cfheaders: %d / %d, %s\n",
3191 : : stop_height - start_height + 1, max_height_diff, node.DisconnectMsg(fLogIPs));
3192 : 2 : node.fDisconnect = true;
3193 : 2 : return false;
3194 : : }
3195 : :
3196 : 7 : filter_index = GetBlockFilterIndex(filter_type);
3197 [ - + ]: 7 : if (!filter_index) {
3198 [ # # ]: 0 : LogDebug(BCLog::NET, "Filter index for supported type %s not found\n", BlockFilterTypeName(filter_type));
3199 : 0 : return false;
3200 : : }
3201 : :
3202 : : return true;
3203 : : }
3204 : :
3205 : 4 : void PeerManagerImpl::ProcessGetCFilters(CNode& node, Peer& peer, DataStream& vRecv)
3206 : : {
3207 : 4 : uint8_t filter_type_ser;
3208 : 4 : uint32_t start_height;
3209 : 4 : uint256 stop_hash;
3210 : :
3211 : 4 : vRecv >> filter_type_ser >> start_height >> stop_hash;
3212 : :
3213 : 4 : const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser);
3214 : :
3215 : 4 : const CBlockIndex* stop_index;
3216 : 4 : BlockFilterIndex* filter_index;
3217 [ + + ]: 4 : if (!PrepareBlockFilterRequest(node, peer, filter_type, start_height, stop_hash,
3218 : : MAX_GETCFILTERS_SIZE, stop_index, filter_index)) {
3219 : : return;
3220 : : }
3221 : :
3222 : 2 : std::vector<BlockFilter> filters;
3223 [ + - - + ]: 2 : if (!filter_index->LookupFilterRange(start_height, stop_index, filters)) {
3224 [ # # # # : 0 : LogDebug(BCLog::NET, "Failed to find block filter in index: filter_type=%s, start_height=%d, stop_hash=%s\n",
# # # # #
# ]
3225 : : BlockFilterTypeName(filter_type), start_height, stop_hash.ToString());
3226 : 0 : return;
3227 : : }
3228 : :
3229 [ + + ]: 13 : for (const auto& filter : filters) {
3230 [ + - + - ]: 22 : MakeAndPushMessage(node, NetMsgType::CFILTER, filter);
3231 : : }
3232 : 2 : }
3233 : :
3234 : 5 : void PeerManagerImpl::ProcessGetCFHeaders(CNode& node, Peer& peer, DataStream& vRecv)
3235 : : {
3236 : 5 : uint8_t filter_type_ser;
3237 : 5 : uint32_t start_height;
3238 : 5 : uint256 stop_hash;
3239 : :
3240 : 5 : vRecv >> filter_type_ser >> start_height >> stop_hash;
3241 : :
3242 : 5 : const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser);
3243 : :
3244 : 5 : const CBlockIndex* stop_index;
3245 : 5 : BlockFilterIndex* filter_index;
3246 [ + + ]: 5 : if (!PrepareBlockFilterRequest(node, peer, filter_type, start_height, stop_hash,
3247 : : MAX_GETCFHEADERS_SIZE, stop_index, filter_index)) {
3248 : : return;
3249 : : }
3250 : :
3251 : 2 : uint256 prev_header;
3252 [ + - ]: 2 : if (start_height > 0) {
3253 : 2 : const CBlockIndex* const prev_block =
3254 : 2 : stop_index->GetAncestor(static_cast<int>(start_height - 1));
3255 [ - + ]: 2 : if (!filter_index->LookupFilterHeader(prev_block, prev_header)) {
3256 [ # # # # : 0 : LogDebug(BCLog::NET, "Failed to find block filter header in index: filter_type=%s, block_hash=%s\n",
# # ]
3257 : : BlockFilterTypeName(filter_type), prev_block->GetBlockHash().ToString());
3258 : 0 : return;
3259 : : }
3260 : : }
3261 : :
3262 : 2 : std::vector<uint256> filter_hashes;
3263 [ + - - + ]: 2 : if (!filter_index->LookupFilterHashRange(start_height, stop_index, filter_hashes)) {
3264 [ # # # # : 0 : LogDebug(BCLog::NET, "Failed to find block filter hashes in index: filter_type=%s, start_height=%d, stop_hash=%s\n",
# # # # #
# ]
3265 : : BlockFilterTypeName(filter_type), start_height, stop_hash.ToString());
3266 : 0 : return;
3267 : : }
3268 : :
3269 [ + - + - ]: 4 : MakeAndPushMessage(node, NetMsgType::CFHEADERS,
3270 : : filter_type_ser,
3271 [ + - ]: 2 : stop_index->GetBlockHash(),
3272 : : prev_header,
3273 : : filter_hashes);
3274 : 2 : }
3275 : :
3276 : 6 : void PeerManagerImpl::ProcessGetCFCheckPt(CNode& node, Peer& peer, DataStream& vRecv)
3277 : : {
3278 : 6 : uint8_t filter_type_ser;
3279 : 6 : uint256 stop_hash;
3280 : :
3281 : 6 : vRecv >> filter_type_ser >> stop_hash;
3282 : :
3283 : 6 : const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser);
3284 : :
3285 : 6 : const CBlockIndex* stop_index;
3286 : 6 : BlockFilterIndex* filter_index;
3287 [ + + ]: 6 : if (!PrepareBlockFilterRequest(node, peer, filter_type, /*start_height=*/0, stop_hash,
3288 : : /*max_height_diff=*/std::numeric_limits<uint32_t>::max(),
3289 : : stop_index, filter_index)) {
3290 : : return;
3291 : : }
3292 : :
3293 : 3 : std::vector<uint256> headers(stop_index->nHeight / CFCHECKPT_INTERVAL);
3294 : :
3295 : : // Populate headers.
3296 : 3 : const CBlockIndex* block_index = stop_index;
3297 [ + + ]: 7 : for (int i = headers.size() - 1; i >= 0; i--) {
3298 : 4 : int height = (i + 1) * CFCHECKPT_INTERVAL;
3299 [ + - ]: 4 : block_index = block_index->GetAncestor(height);
3300 : :
3301 [ + - - + ]: 4 : if (!filter_index->LookupFilterHeader(block_index, headers[i])) {
3302 [ # # # # : 0 : LogDebug(BCLog::NET, "Failed to find block filter header in index: filter_type=%s, block_hash=%s\n",
# # # # #
# ]
3303 : : BlockFilterTypeName(filter_type), block_index->GetBlockHash().ToString());
3304 : 0 : return;
3305 : : }
3306 : : }
3307 : :
3308 [ + - + - ]: 6 : MakeAndPushMessage(node, NetMsgType::CFCHECKPT,
3309 : : filter_type_ser,
3310 [ + - ]: 3 : stop_index->GetBlockHash(),
3311 : : headers);
3312 : 3 : }
3313 : :
3314 : 57844 : void PeerManagerImpl::ProcessBlock(CNode& node, const std::shared_ptr<const CBlock>& block, bool force_processing, bool min_pow_checked)
3315 : : {
3316 : 57844 : bool new_block{false};
3317 : 57844 : m_chainman.ProcessNewBlock(block, force_processing, min_pow_checked, &new_block);
3318 [ + + ]: 57844 : if (new_block) {
3319 : 56709 : node.m_last_block_time = GetTime<std::chrono::seconds>();
3320 : : // In case this block came from a different peer than we requested
3321 : : // from, we can erase the block request now anyway (as we just stored
3322 : : // this block to disk).
3323 : 56709 : LOCK(cs_main);
3324 [ + - + - ]: 56709 : RemoveBlockRequest(block->GetHash(), std::nullopt);
3325 : 56709 : } else {
3326 : 1135 : LOCK(cs_main);
3327 [ + - + - ]: 2270 : mapBlockSource.erase(block->GetHash());
3328 : 1135 : }
3329 : 57844 : }
3330 : :
3331 : 16429 : void PeerManagerImpl::ProcessCompactBlockTxns(CNode& pfrom, Peer& peer, const BlockTransactions& block_transactions)
3332 : : {
3333 : 16429 : std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
3334 : 16429 : bool fBlockRead{false};
3335 : 16429 : {
3336 [ + - ]: 16429 : LOCK(cs_main);
3337 : :
3338 : 16429 : auto range_flight = mapBlocksInFlight.equal_range(block_transactions.blockhash);
3339 : 16429 : size_t already_in_flight = std::distance(range_flight.first, range_flight.second);
3340 : 16429 : bool requested_block_from_this_peer{false};
3341 : :
3342 : : // Multimap ensures ordering of outstanding requests. It's either empty or first in line.
3343 [ + + + + ]: 16429 : bool first_in_flight = already_in_flight == 0 || (range_flight.first->second.first == pfrom.GetId());
3344 : :
3345 [ + + ]: 16891 : while (range_flight.first != range_flight.second) {
3346 [ + + ]: 16879 : auto [node_id, block_it] = range_flight.first->second;
3347 [ + + - + ]: 16879 : if (node_id == pfrom.GetId() && block_it->partialBlock) {
3348 : : requested_block_from_this_peer = true;
3349 : : break;
3350 : : }
3351 : 462 : range_flight.first++;
3352 : : }
3353 : :
3354 [ + + ]: 16429 : if (!requested_block_from_this_peer) {
3355 [ + - + - : 12 : LogDebug(BCLog::NET, "Peer %d sent us block transactions for block we weren't expecting\n", pfrom.GetId());
+ - ]
3356 : 12 : return;
3357 : : }
3358 : :
3359 [ + - ]: 16417 : PartiallyDownloadedBlock& partialBlock = *range_flight.first->second.second->partialBlock;
3360 [ + - ]: 16417 : ReadStatus status = partialBlock.FillBlock(*pblock, block_transactions.txn);
3361 [ - + ]: 16417 : if (status == READ_STATUS_INVALID) {
3362 [ # # ]: 0 : RemoveBlockRequest(block_transactions.blockhash, pfrom.GetId()); // Reset in-flight state in case Misbehaving does not result in a disconnect
3363 [ # # # # ]: 0 : Misbehaving(peer, "invalid compact block/non-matching block transactions");
3364 : 0 : return;
3365 [ + + ]: 16417 : } else if (status == READ_STATUS_FAILED) {
3366 [ + - ]: 1 : if (first_in_flight) {
3367 : : // Might have collided, fall back to getdata now :(
3368 : 1 : std::vector<CInv> invs;
3369 [ + - ]: 1 : invs.emplace_back(MSG_BLOCK | GetFetchFlags(peer), block_transactions.blockhash);
3370 [ + - + - ]: 2 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, invs);
3371 : 1 : } else {
3372 [ # # ]: 0 : RemoveBlockRequest(block_transactions.blockhash, pfrom.GetId());
3373 [ # # # # : 0 : LogDebug(BCLog::NET, "Peer %d sent us a compact block but it failed to reconstruct, waiting on first download to complete\n", pfrom.GetId());
# # ]
3374 : 0 : return;
3375 : : }
3376 : : } else {
3377 : : // Block is either okay, or possibly we received
3378 : : // READ_STATUS_CHECKBLOCK_FAILED.
3379 : : // Note that CheckBlock can only fail for one of a few reasons:
3380 : : // 1. bad-proof-of-work (impossible here, because we've already
3381 : : // accepted the header)
3382 : : // 2. merkleroot doesn't match the transactions given (already
3383 : : // caught in FillBlock with READ_STATUS_FAILED, so
3384 : : // impossible here)
3385 : : // 3. the block is otherwise invalid (eg invalid coinbase,
3386 : : // block is too big, too many legacy sigops, etc).
3387 : : // So if CheckBlock failed, #3 is the only possibility.
3388 : : // Under BIP 152, we don't discourage the peer unless proof of work is
3389 : : // invalid (we don't require all the stateless checks to have
3390 : : // been run). This is handled below, so just treat this as
3391 : : // though the block was successfully read, and rely on the
3392 : : // handling in ProcessNewBlock to ensure the block index is
3393 : : // updated, etc.
3394 [ + - ]: 16416 : RemoveBlockRequest(block_transactions.blockhash, pfrom.GetId()); // it is now an empty pointer
3395 : 16416 : fBlockRead = true;
3396 : : // mapBlockSource is used for potentially punishing peers and
3397 : : // updating which peers send us compact blocks, so the race
3398 : : // between here and cs_main in ProcessNewBlock is fine.
3399 : : // BIP 152 permits peers to relay compact blocks after validating
3400 : : // the header only; we should not punish peers if the block turns
3401 : : // out to be invalid.
3402 [ + - ]: 16416 : mapBlockSource.emplace(block_transactions.blockhash, std::make_pair(pfrom.GetId(), false));
3403 : : }
3404 : 12 : } // Don't hold cs_main when we call into ProcessNewBlock
3405 [ + + ]: 16417 : if (fBlockRead) {
3406 : : // Since we requested this block (it was in mapBlocksInFlight), force it to be processed,
3407 : : // even if it would not be a candidate for new tip (missing previous block, chain not long enough, etc)
3408 : : // This bypasses some anti-DoS logic in AcceptBlock (eg to prevent
3409 : : // disk-space attacks), but this should be safe due to the
3410 : : // protections in the compact block handler -- see related comment
3411 : : // in compact block optimistic reconstruction handling.
3412 [ + - + - ]: 49248 : ProcessBlock(pfrom, pblock, /*force_processing=*/true, /*min_pow_checked=*/true);
3413 : : }
3414 : : return;
3415 : 16429 : }
3416 : :
3417 : 22110 : void PeerManagerImpl::LogBlockHeader(const CBlockIndex& index, const CNode& peer, bool via_compact_block) {
3418 : : // To prevent log spam, this function should only be called after it was determined that a
3419 : : // header is both new and valid.
3420 : : //
3421 : : // These messages are valuable for detecting potential selfish mining behavior;
3422 : : // if multiple displacing headers are seen near simultaneously across many
3423 : : // nodes in the network, this might be an indication of selfish mining.
3424 : : // In addition it can be used to identify peers which send us a header, but
3425 : : // don't followup with a complete and valid (compact) block.
3426 : : // Having this log by default when not in IBD ensures broad availability of
3427 : : // this data in case investigation is merited.
3428 : 22110 : const auto msg = strprintf(
3429 : : "Saw new %sheader hash=%s height=%d peer=%d%s",
3430 [ + + ]: 22110 : via_compact_block ? "cmpctblock " : "",
3431 [ + - ]: 44220 : index.GetBlockHash().ToString(),
3432 : 22110 : index.nHeight,
3433 : 22110 : peer.GetId(),
3434 : 22110 : peer.LogIP(fLogIPs)
3435 [ + - ]: 22110 : );
3436 [ + - + + ]: 22110 : if (m_chainman.IsInitialBlockDownload()) {
3437 [ + - + - : 511 : LogDebug(BCLog::VALIDATION, "%s", msg);
+ - ]
3438 : : } else {
3439 [ + - ]: 21599 : LogInfo("%s", msg);
3440 : : }
3441 : 22110 : }
3442 : :
3443 : 157130 : void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type, DataStream& vRecv,
3444 : : const std::chrono::microseconds time_received,
3445 : : const std::atomic<bool>& interruptMsgProc)
3446 : : {
3447 : 157130 : AssertLockHeld(g_msgproc_mutex);
3448 : :
3449 [ + - + - ]: 314260 : LogDebug(BCLog::NET, "received: %s (%u bytes) peer=%d\n", SanitizeString(msg_type), vRecv.size(), pfrom.GetId());
3450 : :
3451 : 157130 : PeerRef peer = GetPeerRef(pfrom.GetId());
3452 [ + - ]: 157130 : if (peer == nullptr) return;
3453 : :
3454 [ + + ]: 157130 : if (msg_type == NetMsgType::VERSION) {
3455 [ + + ]: 1510 : if (pfrom.nVersion != 0) {
3456 [ + - + - : 1 : LogDebug(BCLog::NET, "redundant version message from peer=%d\n", pfrom.GetId());
+ - ]
3457 : 1 : return;
3458 : : }
3459 : :
3460 : 1509 : int64_t nTime;
3461 [ + - ]: 1509 : CService addrMe;
3462 : 1509 : uint64_t nNonce = 1;
3463 : 1509 : ServiceFlags nServices;
3464 : 1509 : int nVersion;
3465 [ + - ]: 1509 : std::string cleanSubVer;
3466 : 1509 : int starting_height = -1;
3467 : 1509 : bool fRelay = true;
3468 : :
3469 [ + - + - : 1509 : vRecv >> nVersion >> Using<CustomUintFormatter<8>>(nServices) >> nTime;
+ - ]
3470 [ - + ]: 1509 : if (nTime < 0) {
3471 : 0 : nTime = 0;
3472 : : }
3473 [ + - ]: 1509 : vRecv.ignore(8); // Ignore the addrMe service bits sent by the peer
3474 [ + - ]: 1509 : vRecv >> CNetAddr::V1(addrMe);
3475 [ + + ]: 1509 : if (!pfrom.IsInboundConn())
3476 : : {
3477 : : // Overwrites potentially existing services. In contrast to this,
3478 : : // unvalidated services received via gossip relay in ADDR/ADDRV2
3479 : : // messages are only ever added but cannot replace existing ones.
3480 [ + - ]: 566 : m_addrman.SetServices(pfrom.addr, nServices);
3481 : : }
3482 [ + + + + ]: 1509 : if (pfrom.ExpectServicesFromConn() && !HasAllDesirableServiceFlags(nServices))
3483 : : {
3484 [ + - + - : 48 : LogDebug(BCLog::NET, "peer does not offer the expected services (%08x offered, %08x expected), %s\n",
+ - + - ]
3485 : : nServices,
3486 : : GetDesirableServiceFlags(nServices),
3487 : : pfrom.DisconnectMsg(fLogIPs));
3488 : 24 : pfrom.fDisconnect = true;
3489 : 24 : return;
3490 : : }
3491 : :
3492 [ + + ]: 1485 : if (nVersion < MIN_PEER_PROTO_VERSION) {
3493 : : // disconnect from peers older than this proto version
3494 [ + - + - : 2 : LogDebug(BCLog::NET, "peer using obsolete version %i, %s\n", nVersion, pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
3495 : 1 : pfrom.fDisconnect = true;
3496 : 1 : return;
3497 : : }
3498 : :
3499 [ + + ]: 1484 : if (!vRecv.empty()) {
3500 : : // The version message includes information about the sending node which we don't use:
3501 : : // - 8 bytes (service bits)
3502 : : // - 16 bytes (ipv6 address)
3503 : : // - 2 bytes (port)
3504 [ + - ]: 1483 : vRecv.ignore(26);
3505 [ + - ]: 1483 : vRecv >> nNonce;
3506 : : }
3507 [ + + ]: 1484 : if (!vRecv.empty()) {
3508 [ + - ]: 1483 : std::string strSubVer;
3509 [ + - ]: 1483 : vRecv >> LIMITED_STRING(strSubVer, MAX_SUBVERSION_LENGTH);
3510 [ + - ]: 1483 : cleanSubVer = SanitizeString(strSubVer);
3511 : 1483 : }
3512 [ + + ]: 1484 : if (!vRecv.empty()) {
3513 [ + - ]: 1483 : vRecv >> starting_height;
3514 : : }
3515 [ + + ]: 1484 : if (!vRecv.empty())
3516 [ + - ]: 1483 : vRecv >> fRelay;
3517 : : // Disconnect if we connected to ourself
3518 [ + + + - : 1484 : if (pfrom.IsInboundConn() && !m_connman.CheckIncomingNonce(nNonce))
+ + ]
3519 : : {
3520 [ + - + - ]: 2 : LogPrintf("connected to self at %s, disconnecting\n", pfrom.addr.ToStringAddrPort());
3521 : 2 : pfrom.fDisconnect = true;
3522 : 2 : return;
3523 : : }
3524 : :
3525 [ + + + - : 1482 : if (pfrom.IsInboundConn() && addrMe.IsRoutable())
- + ]
3526 : : {
3527 [ # # ]: 0 : SeenLocal(addrMe);
3528 : : }
3529 : :
3530 : : // Inbound peers send us their version message when they connect.
3531 : : // We send our version message in response.
3532 [ + + ]: 1482 : if (pfrom.IsInboundConn()) {
3533 [ + - ]: 940 : PushNodeVersion(pfrom, *peer);
3534 : : }
3535 : :
3536 : : // Change version
3537 [ + - ]: 1482 : const int greatest_common_version = std::min(nVersion, PROTOCOL_VERSION);
3538 : 1482 : pfrom.SetCommonVersion(greatest_common_version);
3539 [ + + ]: 1482 : pfrom.nVersion = nVersion;
3540 : :
3541 [ + + ]: 1482 : if (greatest_common_version >= WTXID_RELAY_VERSION) {
3542 [ + - + - ]: 1478 : MakeAndPushMessage(pfrom, NetMsgType::WTXIDRELAY);
3543 : : }
3544 : :
3545 : : // Signal ADDRv2 support (BIP155).
3546 : 1478 : if (greatest_common_version >= 70016) {
3547 : : // BIP155 defines addrv2 and sendaddrv2 for all protocol versions, but some
3548 : : // implementations reject messages they don't know. As a courtesy, don't send
3549 : : // it to nodes with a version before 70016, as no software is known to support
3550 : : // BIP155 that doesn't announce at least that protocol version number.
3551 [ + - + - ]: 2956 : MakeAndPushMessage(pfrom, NetMsgType::SENDADDRV2);
3552 : : }
3553 : :
3554 [ + - ]: 1482 : pfrom.m_has_all_wanted_services = HasAllDesirableServiceFlags(nServices);
3555 [ + - ]: 1482 : peer->m_their_services = nServices;
3556 [ + - ]: 1482 : pfrom.SetAddrLocal(addrMe);
3557 : 1482 : {
3558 [ + - ]: 1482 : LOCK(pfrom.m_subver_mutex);
3559 [ + - + - ]: 2964 : pfrom.cleanSubVer = cleanSubVer;
3560 : 0 : }
3561 [ + + ]: 1482 : peer->m_starting_height = starting_height;
3562 : :
3563 : : // Only initialize the Peer::TxRelay m_relay_txs data structure if:
3564 : : // - this isn't an outbound block-relay-only connection, and
3565 : : // - this isn't an outbound feeler connection, and
3566 : : // - fRelay=true (the peer wishes to receive transaction announcements)
3567 : : // or we're offering NODE_BLOOM to this peer. NODE_BLOOM means that
3568 : : // the peer may turn on transaction relay later.
3569 [ + + ]: 1482 : if (!pfrom.IsBlockOnlyConn() &&
3570 [ + + + + : 1482 : !pfrom.IsFeelerConn() &&
+ + ]
3571 [ + + ]: 3 : (fRelay || (peer->m_our_services & NODE_BLOOM))) {
3572 [ + - ]: 1451 : auto* const tx_relay = peer->SetTxRelay();
3573 : 1451 : {
3574 [ + - ]: 1451 : LOCK(tx_relay->m_bloom_filter_mutex);
3575 [ + - ]: 1451 : tx_relay->m_relay_txs = fRelay; // set to true after we get the first filter* message
3576 : 1451 : }
3577 [ + + ]: 1451 : if (fRelay) pfrom.m_relays_txs = true;
3578 : : }
3579 : :
3580 [ + + + + ]: 1482 : if (greatest_common_version >= WTXID_RELAY_VERSION && m_txreconciliation) {
3581 : : // Per BIP-330, we announce txreconciliation support if:
3582 : : // - protocol version per the peer's VERSION message supports WTXID_RELAY;
3583 : : // - transaction relay is supported per the peer's VERSION message
3584 : : // - this is not a block-relay-only connection and not a feeler
3585 : : // - this is not an addr fetch connection;
3586 : : // - we are not in -blocksonly mode.
3587 [ + - ]: 15 : const auto* tx_relay = peer->GetTxRelay();
3588 [ + - + + : 22 : if (tx_relay && WITH_LOCK(tx_relay->m_bloom_filter_mutex, return tx_relay->m_relay_txs) &&
+ - ]
3589 [ + + + + : 25 : !pfrom.IsAddrFetchConn() && !m_opts.ignore_incoming_txs) {
+ + ]
3590 [ + - ]: 8 : const uint64_t recon_salt = m_txreconciliation->PreRegisterPeer(pfrom.GetId());
3591 [ + - + - ]: 16 : MakeAndPushMessage(pfrom, NetMsgType::SENDTXRCNCL,
3592 : : TXRECONCILIATION_VERSION, recon_salt);
3593 : : }
3594 : : }
3595 : :
3596 [ + - + - ]: 1482 : MakeAndPushMessage(pfrom, NetMsgType::VERACK);
3597 : :
3598 : : // Potentially mark this peer as a preferred download peer.
3599 : 1482 : {
3600 [ + - ]: 1482 : LOCK(cs_main);
3601 : 1482 : CNodeState* state = State(pfrom.GetId());
3602 [ + + + + : 1482 : state->fPreferredDownload = (!pfrom.IsInboundConn() || pfrom.HasPermission(NetPermissionFlags::NoBan)) && !pfrom.IsAddrFetchConn() && CanServeBlocks(*peer);
+ + + + ]
3603 [ + - ]: 1482 : m_num_preferred_download_peers += state->fPreferredDownload;
3604 : 1482 : }
3605 : :
3606 : : // Attempt to initialize address relay for outbound peers and use result
3607 : : // to decide whether to send GETADDR, so that we don't send it to
3608 : : // inbound or outbound block-relay-only peers.
3609 : 1482 : bool send_getaddr{false};
3610 [ + + ]: 1482 : if (!pfrom.IsInboundConn()) {
3611 [ + - ]: 542 : send_getaddr = SetupAddressRelay(pfrom, *peer);
3612 : : }
3613 [ + + ]: 542 : if (send_getaddr) {
3614 : : // Do a one-time address fetch to help populate/update our addrman.
3615 : : // If we're starting up for the first time, our addrman may be pretty
3616 : : // empty, so this mechanism is important to help us connect to the network.
3617 : : // We skip this for block-relay-only peers. We want to avoid
3618 : : // potentially leaking addr information and we do not want to
3619 : : // indicate to the peer that we will participate in addr relay.
3620 [ + - + - ]: 516 : MakeAndPushMessage(pfrom, NetMsgType::GETADDR);
3621 : 516 : peer->m_getaddr_sent = true;
3622 : : // When requesting a getaddr, accept an additional MAX_ADDR_TO_SEND addresses in response
3623 : : // (bypassing the MAX_ADDR_PROCESSING_TOKEN_BUCKET limit).
3624 : 516 : peer->m_addr_token_bucket += MAX_ADDR_TO_SEND;
3625 : : }
3626 : :
3627 [ + + ]: 1482 : if (!pfrom.IsInboundConn()) {
3628 : : // For non-inbound connections, we update the addrman to record
3629 : : // connection success so that addrman will have an up-to-date
3630 : : // notion of which peers are online and available.
3631 : : //
3632 : : // While we strive to not leak information about block-relay-only
3633 : : // connections via the addrman, not moving an address to the tried
3634 : : // table is also potentially detrimental because new-table entries
3635 : : // are subject to eviction in the event of addrman collisions. We
3636 : : // mitigate the information-leak by never calling
3637 : : // AddrMan::Connected() on block-relay-only peers; see
3638 : : // FinalizeNode().
3639 : : //
3640 : : // This moves an address from New to Tried table in Addrman,
3641 : : // resolves tried-table collisions, etc.
3642 [ + - ]: 542 : m_addrman.Good(pfrom.addr);
3643 : : }
3644 : :
3645 [ + - ]: 1482 : const auto mapped_as{m_connman.GetMappedAS(pfrom.addr)};
3646 [ + - + - : 2964 : LogDebug(BCLog::NET, "receive version message: %s: version %d, blocks=%d, us=%s, txrelay=%d, peer=%d%s%s\n",
- + - - +
- + - + -
+ - ]
3647 : : cleanSubVer, pfrom.nVersion,
3648 : : peer->m_starting_height, addrMe.ToStringAddrPort(), fRelay, pfrom.GetId(),
3649 : : pfrom.LogIP(fLogIPs), (mapped_as ? strprintf(", mapped_as=%d", mapped_as) : ""));
3650 : :
3651 : 1482 : peer->m_time_offset = NodeSeconds{std::chrono::seconds{nTime}} - Now<NodeSeconds>();
3652 [ + + ]: 1482 : if (!pfrom.IsInboundConn()) {
3653 : : // Don't use timedata samples from inbound peers to make it
3654 : : // harder for others to create false warnings about our clock being out of sync.
3655 [ + - ]: 542 : m_outbound_time_offsets.Add(peer->m_time_offset);
3656 [ + - ]: 542 : m_outbound_time_offsets.WarnIfOutOfSync();
3657 : : }
3658 : :
3659 : : // If the peer is old enough to have the old alert system, send it the final alert.
3660 [ - + ]: 1482 : if (greatest_common_version <= 70012) {
3661 : 0 : constexpr auto finalAlert{"60010000000000000000000000ffffff7f00000000ffffff7ffeffff7f01ffffff7f00000000ffffff7f00ffffff7f002f555247454e543a20416c657274206b657920636f6d70726f6d697365642c2075706772616465207265717569726564004630440220653febd6410f470f6bae11cad19c48413becb1ac2c17f908fd0fd53bdc3abd5202206d0e9c96fe88d4a0f01ed9dedae2b6f9e00da94cad0fecaae66ecf689bf71b50"_hex};
3662 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, "alert", finalAlert);
3663 : : }
3664 : :
3665 : : // Feeler connections exist only to verify if address is online.
3666 [ + + ]: 1482 : if (pfrom.IsFeelerConn()) {
3667 [ + - + - : 8 : LogDebug(BCLog::NET, "feeler connection completed, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
3668 : 4 : pfrom.fDisconnect = true;
3669 : : }
3670 : 1482 : return;
3671 : 1509 : }
3672 : :
3673 [ + + ]: 155620 : if (pfrom.nVersion == 0) {
3674 : : // Must have a version message before anything else
3675 [ + - + - : 8 : LogDebug(BCLog::NET, "non-version message before version handshake. Message \"%s\" from peer=%d\n", SanitizeString(msg_type), pfrom.GetId());
+ - + - ]
3676 : 4 : return;
3677 : : }
3678 : :
3679 [ + + ]: 155616 : if (msg_type == NetMsgType::VERACK) {
3680 [ - + ]: 1468 : if (pfrom.fSuccessfullyConnected) {
3681 [ # # # # : 0 : LogDebug(BCLog::NET, "ignoring redundant verack message from peer=%d\n", pfrom.GetId());
# # ]
3682 : 0 : return;
3683 : : }
3684 : :
3685 : : // Log successful connections unconditionally for outbound, but not for inbound as those
3686 : : // can be triggered by an attacker at high rate.
3687 [ + + + - : 1468 : if (!pfrom.IsInboundConn() || LogAcceptCategory(BCLog::NET, BCLog::Level::Debug)) {
+ - ]
3688 [ + - ]: 1468 : const auto mapped_as{m_connman.GetMappedAS(pfrom.addr)};
3689 [ - + - - : 4404 : LogPrintf("New %s %s peer connected: version: %d, blocks=%d, peer=%d%s%s\n",
+ - + - +
- + - ]
3690 : : pfrom.ConnectionTypeAsString(),
3691 : : TransportTypeAsString(pfrom.m_transport->GetInfo().transport_type),
3692 : : pfrom.nVersion.load(), peer->m_starting_height,
3693 : : pfrom.GetId(), pfrom.LogIP(fLogIPs),
3694 : : (mapped_as ? strprintf(", mapped_as=%d", mapped_as) : ""));
3695 : : }
3696 : :
3697 [ + - ]: 1468 : if (pfrom.GetCommonVersion() >= SHORT_IDS_BLOCKS_VERSION) {
3698 : : // Tell our peer we are willing to provide version 2 cmpctblocks.
3699 : : // However, we do not request new block announcements using
3700 : : // cmpctblock messages.
3701 : : // We send this to non-NODE NETWORK peers as well, because
3702 : : // they may wish to request compact blocks from us
3703 [ + - + - ]: 2936 : MakeAndPushMessage(pfrom, NetMsgType::SENDCMPCT, /*high_bandwidth=*/false, /*version=*/CMPCTBLOCKS_VERSION);
3704 : : }
3705 : :
3706 [ + + ]: 1468 : if (m_txreconciliation) {
3707 [ + + + - : 11 : if (!peer->m_wtxid_relay || !m_txreconciliation->IsPeerRegistered(pfrom.GetId())) {
+ - ]
3708 : : // We could have optimistically pre-registered/registered the peer. In that case,
3709 : : // we should forget about the reconciliation state here if this wasn't followed
3710 : : // by WTXIDRELAY (since WTXIDRELAY can't be announced later).
3711 [ + - ]: 11 : m_txreconciliation->ForgetPeer(pfrom.GetId());
3712 : : }
3713 : : }
3714 : :
3715 [ + - + + ]: 1468 : if (auto tx_relay = peer->GetTxRelay()) {
3716 : : // `TxRelay::m_tx_inventory_to_send` must be empty before the
3717 : : // version handshake is completed as
3718 : : // `TxRelay::m_next_inv_send_time` is first initialised in
3719 : : // `SendMessages` after the verack is received. Any transactions
3720 : : // received during the version handshake would otherwise
3721 : : // immediately be advertised without random delay, potentially
3722 : : // leaking the time of arrival to a spy.
3723 [ + - + - : 2884 : Assume(WITH_LOCK(
- + + - ]
3724 : : tx_relay->m_tx_inventory_mutex,
3725 : : return tx_relay->m_tx_inventory_to_send.empty() &&
3726 : : tx_relay->m_next_inv_send_time == 0s));
3727 : : }
3728 : :
3729 : 1468 : {
3730 [ + - + - ]: 1468 : LOCK2(::cs_main, m_tx_download_mutex);
3731 : 1468 : const CNodeState* state = State(pfrom.GetId());
3732 : 1468 : m_txdownloadman.ConnectedPeer(pfrom.GetId(), node::TxDownloadConnectionInfo {
3733 [ + - ]: 1468 : .m_preferred = state->fPreferredDownload,
3734 [ + - ]: 1468 : .m_relay_permissions = pfrom.HasPermission(NetPermissionFlags::Relay),
3735 [ + - ]: 1468 : .m_wtxid_relay = peer->m_wtxid_relay,
3736 : : });
3737 [ + - ]: 1468 : }
3738 : :
3739 : 1468 : pfrom.fSuccessfullyConnected = true;
3740 : 1468 : return;
3741 : : }
3742 : :
3743 [ + + ]: 154148 : if (msg_type == NetMsgType::SENDHEADERS) {
3744 : 683 : peer->m_prefers_headers = true;
3745 : 683 : return;
3746 : : }
3747 : :
3748 [ + + ]: 153465 : if (msg_type == NetMsgType::SENDCMPCT) {
3749 : 1225 : bool sendcmpct_hb{false};
3750 : 1225 : uint64_t sendcmpct_version{0};
3751 [ + - + - ]: 1225 : vRecv >> sendcmpct_hb >> sendcmpct_version;
3752 : :
3753 : : // Only support compact block relay with witnesses
3754 [ + + ]: 1225 : if (sendcmpct_version != CMPCTBLOCKS_VERSION) return;
3755 : :
3756 [ + - ]: 1212 : LOCK(cs_main);
3757 : 1212 : CNodeState* nodestate = State(pfrom.GetId());
3758 : 1212 : nodestate->m_provides_cmpctblocks = true;
3759 : 1212 : nodestate->m_requested_hb_cmpctblocks = sendcmpct_hb;
3760 : : // save whether peer selects us as BIP152 high-bandwidth peer
3761 : : // (receiving sendcmpct(1) signals high-bandwidth, sendcmpct(0) low-bandwidth)
3762 [ + - ]: 1212 : pfrom.m_bip152_highbandwidth_from = sendcmpct_hb;
3763 [ + - ]: 1212 : return;
3764 : 1212 : }
3765 : :
3766 : : // BIP339 defines feature negotiation of wtxidrelay, which must happen between
3767 : : // VERSION and VERACK to avoid relay problems from switching after a connection is up.
3768 [ + + ]: 152240 : if (msg_type == NetMsgType::WTXIDRELAY) {
3769 [ - + ]: 1400 : if (pfrom.fSuccessfullyConnected) {
3770 : : // Disconnect peers that send a wtxidrelay message after VERACK.
3771 [ # # # # : 0 : LogDebug(BCLog::NET, "wtxidrelay received after verack, %s\n", pfrom.DisconnectMsg(fLogIPs));
# # # # ]
3772 : 0 : pfrom.fDisconnect = true;
3773 : 0 : return;
3774 : : }
3775 [ + + ]: 1400 : if (pfrom.GetCommonVersion() >= WTXID_RELAY_VERSION) {
3776 [ + - ]: 1398 : if (!peer->m_wtxid_relay) {
3777 : 1398 : peer->m_wtxid_relay = true;
3778 : 1398 : m_wtxid_relay_peers++;
3779 : : } else {
3780 [ # # # # : 0 : LogDebug(BCLog::NET, "ignoring duplicate wtxidrelay from peer=%d\n", pfrom.GetId());
# # ]
3781 : : }
3782 : : } else {
3783 [ + - + - : 2 : LogDebug(BCLog::NET, "ignoring wtxidrelay due to old common version=%d from peer=%d\n", pfrom.GetCommonVersion(), pfrom.GetId());
+ - ]
3784 : : }
3785 : 1400 : return;
3786 : : }
3787 : :
3788 : : // BIP155 defines feature negotiation of addrv2 and sendaddrv2, which must happen
3789 : : // between VERSION and VERACK.
3790 [ + + ]: 150840 : if (msg_type == NetMsgType::SENDADDRV2) {
3791 [ + + ]: 849 : if (pfrom.fSuccessfullyConnected) {
3792 : : // Disconnect peers that send a SENDADDRV2 message after VERACK.
3793 [ + - + - : 2 : LogDebug(BCLog::NET, "sendaddrv2 received after verack, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
3794 : 1 : pfrom.fDisconnect = true;
3795 : 1 : return;
3796 : : }
3797 : 848 : peer->m_wants_addrv2 = true;
3798 : 848 : return;
3799 : : }
3800 : :
3801 : : // Received from a peer demonstrating readiness to announce transactions via reconciliations.
3802 : : // This feature negotiation must happen between VERSION and VERACK to avoid relay problems
3803 : : // from switching announcement protocols after the connection is up.
3804 [ + + ]: 149991 : if (msg_type == NetMsgType::SENDTXRCNCL) {
3805 [ + + ]: 9 : if (!m_txreconciliation) {
3806 [ + - + - : 1 : LogDebug(BCLog::NET, "sendtxrcncl from peer=%d ignored, as our node does not have txreconciliation enabled\n", pfrom.GetId());
+ - ]
3807 : 1 : return;
3808 : : }
3809 : :
3810 [ + + ]: 8 : if (pfrom.fSuccessfullyConnected) {
3811 [ + - + - : 2 : LogDebug(BCLog::NET, "sendtxrcncl received after verack, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
3812 : 1 : pfrom.fDisconnect = true;
3813 : 1 : return;
3814 : : }
3815 : :
3816 : : // Peer must not offer us reconciliations if we specified no tx relay support in VERSION.
3817 [ + + ]: 7 : if (RejectIncomingTxs(pfrom)) {
3818 [ + - + - : 2 : LogDebug(BCLog::NET, "sendtxrcncl received to which we indicated no tx relay, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
3819 : 1 : pfrom.fDisconnect = true;
3820 : 1 : return;
3821 : : }
3822 : :
3823 : : // Peer must not offer us reconciliations if they specified no tx relay support in VERSION.
3824 : : // This flag might also be false in other cases, but the RejectIncomingTxs check above
3825 : : // eliminates them, so that this flag fully represents what we are looking for.
3826 [ + - ]: 6 : const auto* tx_relay = peer->GetTxRelay();
3827 [ + - + - : 12 : if (!tx_relay || !WITH_LOCK(tx_relay->m_bloom_filter_mutex, return tx_relay->m_relay_txs)) {
+ - + - ]
3828 [ # # # # : 0 : LogDebug(BCLog::NET, "sendtxrcncl received which indicated no tx relay to us, %s\n", pfrom.DisconnectMsg(fLogIPs));
# # # # ]
3829 : 0 : pfrom.fDisconnect = true;
3830 : 0 : return;
3831 : : }
3832 : :
3833 : 6 : uint32_t peer_txreconcl_version;
3834 : 6 : uint64_t remote_salt;
3835 [ + - + - ]: 6 : vRecv >> peer_txreconcl_version >> remote_salt;
3836 : :
3837 [ + - ]: 6 : const ReconciliationRegisterResult result = m_txreconciliation->RegisterPeer(pfrom.GetId(), pfrom.IsInboundConn(),
3838 : : peer_txreconcl_version, remote_salt);
3839 [ + + + + ]: 6 : switch (result) {
3840 : 1 : case ReconciliationRegisterResult::NOT_FOUND:
3841 [ + - + - : 1 : LogDebug(BCLog::NET, "Ignore unexpected txreconciliation signal from peer=%d\n", pfrom.GetId());
+ - ]
3842 : : break;
3843 : : case ReconciliationRegisterResult::SUCCESS:
3844 : : break;
3845 : 1 : case ReconciliationRegisterResult::ALREADY_REGISTERED:
3846 [ + - + - : 2 : LogDebug(BCLog::NET, "txreconciliation protocol violation (sendtxrcncl received from already registered peer), %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
3847 : 1 : pfrom.fDisconnect = true;
3848 : 1 : return;
3849 : 1 : case ReconciliationRegisterResult::PROTOCOL_VIOLATION:
3850 [ + - + - : 2 : LogDebug(BCLog::NET, "txreconciliation protocol violation, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
3851 : 1 : pfrom.fDisconnect = true;
3852 : 1 : return;
3853 : : }
3854 : 4 : return;
3855 : : }
3856 : :
3857 [ + + ]: 149982 : if (!pfrom.fSuccessfullyConnected) {
3858 [ + - + - : 16 : LogDebug(BCLog::NET, "Unsupported message \"%s\" prior to verack from peer=%d\n", SanitizeString(msg_type), pfrom.GetId());
+ - + - ]
3859 : 8 : return;
3860 : : }
3861 : :
3862 [ + + + + ]: 149974 : if (msg_type == NetMsgType::ADDR || msg_type == NetMsgType::ADDRV2) {
3863 : 59 : const auto ser_params{
3864 [ + + ]: 59 : msg_type == NetMsgType::ADDRV2 ?
3865 : : // Set V2 param so that the CNetAddr and CAddress
3866 : : // unserialize methods know that an address in v2 format is coming.
3867 : : CAddress::V2_NETWORK :
3868 : : CAddress::V1_NETWORK,
3869 : : };
3870 : :
3871 : 59 : std::vector<CAddress> vAddr;
3872 : :
3873 [ + + ]: 59 : vRecv >> ser_params(vAddr);
3874 : :
3875 [ + - + + ]: 51 : if (!SetupAddressRelay(pfrom, *peer)) {
3876 [ + - + - : 10 : LogDebug(BCLog::NET, "ignoring %s message from %s peer=%d\n", msg_type, pfrom.ConnectionTypeAsString(), pfrom.GetId());
+ - + - ]
3877 : 5 : return;
3878 : : }
3879 : :
3880 [ + + ]: 46 : if (vAddr.size() > MAX_ADDR_TO_SEND)
3881 : : {
3882 [ + - + - ]: 2 : Misbehaving(*peer, strprintf("%s message size = %u", msg_type, vAddr.size()));
3883 : 2 : return;
3884 : : }
3885 : :
3886 : : // Store the new addresses
3887 : 44 : std::vector<CAddress> vAddrOk;
3888 : 44 : const auto current_a_time{Now<NodeSeconds>()};
3889 : :
3890 : : // Update/increment addr rate limiting bucket.
3891 : 44 : const auto current_time{GetTime<std::chrono::microseconds>()};
3892 [ + + ]: 44 : if (peer->m_addr_token_bucket < MAX_ADDR_PROCESSING_TOKEN_BUCKET) {
3893 : : // Don't increment bucket if it's already full
3894 [ + + ]: 40 : const auto time_diff = std::max(current_time - peer->m_addr_token_timestamp, 0us);
3895 : 40 : const double increment = Ticks<SecondsDouble>(time_diff) * MAX_ADDR_RATE_PER_SECOND;
3896 [ + + ]: 61 : peer->m_addr_token_bucket = std::min<double>(peer->m_addr_token_bucket + increment, MAX_ADDR_PROCESSING_TOKEN_BUCKET);
3897 : : }
3898 : 44 : peer->m_addr_token_timestamp = current_time;
3899 : :
3900 : 44 : const bool rate_limited = !pfrom.HasPermission(NetPermissionFlags::Addr);
3901 : 44 : uint64_t num_proc = 0;
3902 : 44 : uint64_t num_rate_limit = 0;
3903 : 44 : std::shuffle(vAddr.begin(), vAddr.end(), m_rng);
3904 [ + + ]: 3321 : for (CAddress& addr : vAddr)
3905 : : {
3906 [ + - ]: 3277 : if (interruptMsgProc)
3907 : : return;
3908 : :
3909 : : // Apply rate limiting.
3910 [ + + ]: 3277 : if (peer->m_addr_token_bucket < 1.0) {
3911 [ + + ]: 2019 : if (rate_limited) {
3912 : 1998 : ++num_rate_limit;
3913 : 1998 : continue;
3914 : : }
3915 : : } else {
3916 : 1258 : peer->m_addr_token_bucket -= 1.0;
3917 : : }
3918 : : // We only bother storing full nodes, though this may include
3919 : : // things which we would not make an outbound connection to, in
3920 : : // part because we may make feeler connections to them.
3921 [ - + - - ]: 1279 : if (!MayHaveUsefulAddressDB(addr.nServices) && !HasAllDesirableServiceFlags(addr.nServices))
3922 : 0 : continue;
3923 : :
3924 [ + - - + ]: 1279 : if (addr.nTime <= NodeSeconds{100000000s} || addr.nTime > current_a_time + 10min) {
3925 : 0 : addr.nTime = current_a_time - 5 * 24h;
3926 : : }
3927 [ + - ]: 1279 : AddAddressKnown(*peer, addr);
3928 [ + - + - : 1279 : if (m_banman && (m_banman->IsDiscouraged(addr) || m_banman->IsBanned(addr))) {
+ - + - -
+ ]
3929 : : // Do not process banned/discouraged addresses beyond remembering we received them
3930 : 0 : continue;
3931 : : }
3932 : 1279 : ++num_proc;
3933 [ + - ]: 1279 : const bool reachable{g_reachable_nets.Contains(addr)};
3934 [ + - + + : 1279 : if (addr.nTime > current_a_time - 10min && !peer->m_getaddr_sent && vAddr.size() <= 10 && addr.IsRoutable()) {
+ + + - +
+ ]
3935 : : // Relay to a limited number of other nodes
3936 [ + - ]: 53 : RelayAddress(pfrom.GetId(), addr, reachable);
3937 : : }
3938 : : // Do not store addresses outside our network
3939 [ + + ]: 1279 : if (reachable) {
3940 [ + - ]: 1277 : vAddrOk.push_back(addr);
3941 : : }
3942 : : }
3943 [ + - ]: 44 : peer->m_addr_processed += num_proc;
3944 : 44 : peer->m_addr_rate_limited += num_rate_limit;
3945 [ + - + - : 44 : LogDebug(BCLog::NET, "Received addr: %u addresses (%u processed, %u rate-limited) from peer=%d\n",
+ - ]
3946 : : vAddr.size(), num_proc, num_rate_limit, pfrom.GetId());
3947 : :
3948 [ + - ]: 44 : m_addrman.Add(vAddrOk, pfrom.addr, 2h);
3949 [ + - ]: 44 : if (vAddr.size() < 1000) peer->m_getaddr_sent = false;
3950 : :
3951 : : // AddrFetch: Require multiple addresses to avoid disconnecting on self-announcements
3952 [ + + + + ]: 44 : if (pfrom.IsAddrFetchConn() && vAddr.size() > 1) {
3953 [ + - + - : 2 : LogDebug(BCLog::NET, "addrfetch connection completed, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
3954 : 1 : pfrom.fDisconnect = true;
3955 : : }
3956 : 44 : return;
3957 : 59 : }
3958 : :
3959 [ + + ]: 149915 : if (msg_type == NetMsgType::INV) {
3960 : 10581 : std::vector<CInv> vInv;
3961 [ + - ]: 10581 : vRecv >> vInv;
3962 [ + + ]: 10581 : if (vInv.size() > MAX_INV_SZ)
3963 : : {
3964 [ + - + - ]: 1 : Misbehaving(*peer, strprintf("inv message size = %u", vInv.size()));
3965 : 1 : return;
3966 : : }
3967 : :
3968 : 10580 : const bool reject_tx_invs{RejectIncomingTxs(pfrom)};
3969 : :
3970 [ + - + - ]: 10580 : LOCK2(cs_main, m_tx_download_mutex);
3971 : :
3972 : 10580 : const auto current_time{GetTime<std::chrono::microseconds>()};
3973 : 10580 : uint256* best_block{nullptr};
3974 : :
3975 [ + + ]: 37430 : for (CInv& inv : vInv) {
3976 [ + - ]: 26852 : if (interruptMsgProc) return;
3977 : :
3978 : : // Ignore INVs that don't match wtxidrelay setting.
3979 : : // Note that orphan parent fetching always uses MSG_TX GETDATAs regardless of the wtxidrelay setting.
3980 : : // This is fine as no INV messages are involved in that process.
3981 [ + + ]: 26852 : if (peer->m_wtxid_relay) {
3982 [ + + ]: 26835 : if (inv.IsMsgTx()) continue;
3983 : : } else {
3984 [ + + ]: 17 : if (inv.IsMsgWtx()) continue;
3985 : : }
3986 : :
3987 [ + + ]: 26850 : if (inv.IsMsgBlk()) {
3988 [ + - ]: 869 : const bool fAlreadyHave = AlreadyHaveBlock(inv.hash);
3989 [ + - + - : 2469 : LogDebug(BCLog::NET, "got inv: %s %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom.GetId());
+ + + - +
- ]
3990 : :
3991 [ + - ]: 869 : UpdateBlockAvailability(pfrom.GetId(), inv.hash);
3992 [ + + + - : 869 : if (!fAlreadyHave && !m_chainman.m_blockman.LoadingBlocks() && !IsBlockRequested(inv.hash)) {
- + ]
3993 : : // Headers-first is the primary method of announcement on
3994 : : // the network. If a node fell back to sending blocks by
3995 : : // inv, it may be for a re-org, or because we haven't
3996 : : // completed initial headers sync. The final block hash
3997 : : // provided should be the highest, so send a getheaders and
3998 : : // then fetch the blocks we need to catch up.
3999 : : best_block = &inv.hash;
4000 : : }
4001 [ - + ]: 25981 : } else if (inv.IsGenTxMsg()) {
4002 [ + + ]: 25981 : if (reject_tx_invs) {
4003 [ + - + - : 4 : LogDebug(BCLog::NET, "transaction (%s) inv sent in violation of protocol, %s\n", inv.hash.ToString(), pfrom.DisconnectMsg(fLogIPs));
+ - + - +
- ]
4004 : 2 : pfrom.fDisconnect = true;
4005 : 2 : return;
4006 : : }
4007 [ + - ]: 25979 : const GenTxid gtxid = ToGenTxid(inv);
4008 [ + - ]: 25979 : AddKnownTx(*peer, inv.hash);
4009 : :
4010 [ + - + + ]: 25979 : if (!m_chainman.IsInitialBlockDownload()) {
4011 [ + - ]: 25978 : const bool fAlreadyHave{m_txdownloadman.AddTxAnnouncement(pfrom.GetId(), gtxid, current_time)};
4012 [ + - + - : 75244 : LogDebug(BCLog::NET, "got inv: %s %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom.GetId());
+ + + - +
- ]
4013 : : }
4014 : : } else {
4015 [ - - - - : 26850 : LogDebug(BCLog::NET, "Unknown inv type \"%s\" received from peer=%d\n", inv.ToString(), pfrom.GetId());
- - - - ]
4016 : : }
4017 : : }
4018 : :
4019 [ + + ]: 10578 : if (best_block != nullptr) {
4020 : : // If we haven't started initial headers-sync with this peer, then
4021 : : // consider sending a getheaders now. On initial startup, there's a
4022 : : // reliability vs bandwidth tradeoff, where we are only trying to do
4023 : : // initial headers sync with one peer at a time, with a long
4024 : : // timeout (at which point, if the sync hasn't completed, we will
4025 : : // disconnect the peer and then choose another). In the meantime,
4026 : : // as new blocks are found, we are willing to add one new peer per
4027 : : // block to sync with as well, to sync quicker in the case where
4028 : : // our initial peer is unresponsive (but less bandwidth than we'd
4029 : : // use if we turned on sync with all peers).
4030 [ + - ]: 731 : CNodeState& state{*Assert(State(pfrom.GetId()))};
4031 [ + + + + : 731 : if (state.fSyncStarted || (!peer->m_inv_triggered_getheaders_before_sync && *best_block != m_last_block_inv_triggering_headers_sync)) {
+ + ]
4032 [ + - + - : 716 : if (MaybeSendGetHeaders(pfrom, GetLocator(m_chainman.m_best_header), *peer)) {
+ + ]
4033 [ + - + - : 1014 : LogDebug(BCLog::NET, "getheaders (%d) %s to peer=%d\n",
+ - + - ]
4034 : : m_chainman.m_best_header->nHeight, best_block->ToString(),
4035 : : pfrom.GetId());
4036 : : }
4037 [ + + ]: 716 : if (!state.fSyncStarted) {
4038 : 15 : peer->m_inv_triggered_getheaders_before_sync = true;
4039 : : // Update the last block hash that triggered a new headers
4040 : : // sync, so that we don't turn on headers sync with more
4041 : : // than 1 new peer every new block.
4042 : 15 : m_last_block_inv_triggering_headers_sync = *best_block;
4043 : : }
4044 : : }
4045 : : }
4046 : :
4047 : 10578 : return;
4048 [ + - ]: 31741 : }
4049 : :
4050 [ + + ]: 139334 : if (msg_type == NetMsgType::GETDATA) {
4051 : 42595 : std::vector<CInv> vInv;
4052 [ + - ]: 42595 : vRecv >> vInv;
4053 [ + + ]: 42595 : if (vInv.size() > MAX_INV_SZ)
4054 : : {
4055 [ + - + - ]: 1 : Misbehaving(*peer, strprintf("getdata message size = %u", vInv.size()));
4056 : 1 : return;
4057 : : }
4058 : :
4059 [ + - + - : 42594 : LogDebug(BCLog::NET, "received getdata (%u invsz) peer=%d\n", vInv.size(), pfrom.GetId());
+ - ]
4060 : :
4061 [ + - ]: 42594 : if (vInv.size() > 0) {
4062 [ + - + - : 85188 : LogDebug(BCLog::NET, "received getdata for: %s peer=%d\n", vInv[0].ToString(), pfrom.GetId());
+ - + - ]
4063 : : }
4064 : :
4065 : 42594 : {
4066 [ + - ]: 42594 : LOCK(peer->m_getdata_requests_mutex);
4067 [ + - ]: 42594 : peer->m_getdata_requests.insert(peer->m_getdata_requests.end(), vInv.begin(), vInv.end());
4068 [ + - ]: 42594 : ProcessGetData(pfrom, *peer, interruptMsgProc);
4069 : 0 : }
4070 : :
4071 : 42594 : return;
4072 : 42595 : }
4073 : :
4074 [ + + ]: 96739 : if (msg_type == NetMsgType::GETBLOCKS) {
4075 : 4 : CBlockLocator locator;
4076 : 4 : uint256 hashStop;
4077 [ + - + - ]: 4 : vRecv >> locator >> hashStop;
4078 : :
4079 [ + + ]: 4 : if (locator.vHave.size() > MAX_LOCATOR_SZ) {
4080 [ + - + - : 2 : LogDebug(BCLog::NET, "getblocks locator size %lld > %d, %s\n", locator.vHave.size(), MAX_LOCATOR_SZ, pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
4081 : 1 : pfrom.fDisconnect = true;
4082 : 1 : return;
4083 : : }
4084 : :
4085 : : // We might have announced the currently-being-connected tip using a
4086 : : // compact block, which resulted in the peer sending a getblocks
4087 : : // request, which we would otherwise respond to without the new block.
4088 : : // To avoid this situation we simply verify that we are on our best
4089 : : // known chain now. This is super overkill, but we handle it better
4090 : : // for getheaders requests, and there are no known nodes which support
4091 : : // compact blocks but still use getblocks to request blocks.
4092 : 3 : {
4093 : 3 : std::shared_ptr<const CBlock> a_recent_block;
4094 : 3 : {
4095 [ + - ]: 3 : LOCK(m_most_recent_block_mutex);
4096 [ + - ]: 3 : a_recent_block = m_most_recent_block;
4097 : 3 : }
4098 [ + - ]: 3 : BlockValidationState state;
4099 [ + - + - : 9 : if (!m_chainman.ActiveChainstate().ActivateBestChain(state, a_recent_block)) {
+ - + - -
+ ]
4100 [ # # # # : 0 : LogDebug(BCLog::NET, "failed to activate chain (%s)\n", state.ToString());
# # # # ]
4101 : : }
4102 [ + - ]: 3 : }
4103 : :
4104 [ + - ]: 3 : LOCK(cs_main);
4105 : :
4106 : : // Find the last block the caller has in the main chain
4107 [ + - + - ]: 3 : const CBlockIndex* pindex = m_chainman.ActiveChainstate().FindForkInGlobalIndex(locator);
4108 : :
4109 : : // Send the rest of the chain
4110 [ + - ]: 3 : if (pindex)
4111 [ + - ]: 3 : pindex = m_chainman.ActiveChain().Next(pindex);
4112 : 3 : int nLimit = 500;
4113 [ + - + - : 6 : LogDebug(BCLog::NET, "getblocks %d to %s limit %d from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), nLimit, pfrom.GetId());
+ - + - -
- + - +
- ]
4114 [ + - + + ]: 22 : for (; pindex; pindex = m_chainman.ActiveChain().Next(pindex))
4115 : : {
4116 [ - + ]: 19 : if (pindex->GetBlockHash() == hashStop)
4117 : : {
4118 [ # # # # : 0 : LogDebug(BCLog::NET, " getblocks stopping at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString());
# # # # ]
4119 : : break;
4120 : : }
4121 : : // If pruning, don't inv blocks unless we have on disk and are likely to still have
4122 : : // for some reasonable time window (1 hour) that block relay might require.
4123 : 19 : const int nPrunedBlocksLikelyToHave = MIN_BLOCKS_TO_KEEP - 3600 / m_chainparams.GetConsensus().nPowTargetSpacing;
4124 [ - + - - : 19 : if (m_chainman.m_blockman.IsPruneMode() && (!(pindex->nStatus & BLOCK_HAVE_DATA) || pindex->nHeight <= m_chainman.ActiveChain().Tip()->nHeight - nPrunedBlocksLikelyToHave)) {
- - - - -
- ]
4125 [ # # # # : 0 : LogDebug(BCLog::NET, " getblocks stopping, pruned or too old block at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString());
# # # # ]
4126 : : break;
4127 : : }
4128 [ + - + - : 57 : WITH_LOCK(peer->m_block_inv_mutex, peer->m_blocks_for_inv_relay.push_back(pindex->GetBlockHash()));
+ - ]
4129 [ - + ]: 19 : if (--nLimit <= 0) {
4130 : : // When this block is requested, we'll send an inv that'll
4131 : : // trigger the peer to getblocks the next batch of inventory.
4132 [ # # # # : 0 : LogDebug(BCLog::NET, " getblocks stopping at limit %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString());
# # # # ]
4133 [ # # # # ]: 0 : WITH_LOCK(peer->m_block_inv_mutex, {peer->m_continuation_block = pindex->GetBlockHash();});
4134 : : break;
4135 : : }
4136 : : }
4137 [ + - ]: 3 : return;
4138 : 7 : }
4139 : :
4140 [ + + ]: 96735 : if (msg_type == NetMsgType::GETBLOCKTXN) {
4141 : 578 : BlockTransactionsRequest req;
4142 [ + - ]: 578 : vRecv >> req;
4143 : :
4144 : 578 : std::shared_ptr<const CBlock> recent_block;
4145 : 578 : {
4146 [ + - ]: 578 : LOCK(m_most_recent_block_mutex);
4147 [ + + ]: 578 : if (m_most_recent_block_hash == req.blockhash)
4148 : 513 : recent_block = m_most_recent_block;
4149 : : // Unlock m_most_recent_block_mutex to avoid cs_main lock inversion
4150 : 578 : }
4151 [ + + ]: 578 : if (recent_block) {
4152 [ + - ]: 513 : SendBlockTransactions(pfrom, *peer, *recent_block, req);
4153 : : return;
4154 : : }
4155 : :
4156 : 65 : FlatFilePos block_pos{};
4157 : 65 : {
4158 [ + - ]: 65 : LOCK(cs_main);
4159 : :
4160 [ + - ]: 65 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(req.blockhash);
4161 [ + - + + ]: 65 : if (!pindex || !(pindex->nStatus & BLOCK_HAVE_DATA)) {
4162 [ + - + - : 1 : LogDebug(BCLog::NET, "Peer %d sent us a getblocktxn for a block we don't have\n", pfrom.GetId());
+ - ]
4163 [ + - ]: 1 : return;
4164 : : }
4165 : :
4166 [ + - + + ]: 64 : if (pindex->nHeight >= m_chainman.ActiveChain().Height() - MAX_BLOCKTXN_DEPTH) {
4167 : 63 : block_pos = pindex->GetBlockPos();
4168 : : }
4169 : 1 : }
4170 : :
4171 [ + + ]: 64 : if (!block_pos.IsNull()) {
4172 : 63 : CBlock block;
4173 [ + - ]: 63 : const bool ret{m_chainman.m_blockman.ReadBlock(block, block_pos)};
4174 : : // If height is above MAX_BLOCKTXN_DEPTH then this block cannot get
4175 : : // pruned after we release cs_main above, so this read should never fail.
4176 [ - + ]: 63 : assert(ret);
4177 : :
4178 [ + - ]: 63 : SendBlockTransactions(pfrom, *peer, block, req);
4179 : 63 : return;
4180 : 63 : }
4181 : :
4182 : : // If an older block is requested (should never happen in practice,
4183 : : // but can happen in tests) send a block response instead of a
4184 : : // blocktxn response. Sending a full block response instead of a
4185 : : // small blocktxn response is preferable in the case where a peer
4186 : : // might maliciously send lots of getblocktxn requests to trigger
4187 : : // expensive disk reads, because it will require the peer to
4188 : : // actually receive all the data read from disk over the network.
4189 [ + - + - : 1 : LogDebug(BCLog::NET, "Peer %d sent us a getblocktxn for a block > %i deep\n", pfrom.GetId(), MAX_BLOCKTXN_DEPTH);
+ - ]
4190 [ + - ]: 1 : CInv inv{MSG_WITNESS_BLOCK, req.blockhash};
4191 [ + - + - ]: 3 : WITH_LOCK(peer->m_getdata_requests_mutex, peer->m_getdata_requests.push_back(inv));
4192 : : // The message processing loop will go around again (without pausing) and we'll respond then
4193 : : return;
4194 : 578 : }
4195 : :
4196 [ + + ]: 96157 : if (msg_type == NetMsgType::GETHEADERS) {
4197 : 1455 : CBlockLocator locator;
4198 : 1455 : uint256 hashStop;
4199 [ + - + - ]: 1455 : vRecv >> locator >> hashStop;
4200 : :
4201 [ + + ]: 1455 : if (locator.vHave.size() > MAX_LOCATOR_SZ) {
4202 [ + - + - : 2 : LogDebug(BCLog::NET, "getheaders locator size %lld > %d, %s\n", locator.vHave.size(), MAX_LOCATOR_SZ, pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
4203 : 1 : pfrom.fDisconnect = true;
4204 : 1 : return;
4205 : : }
4206 : :
4207 [ - + ]: 1454 : if (m_chainman.m_blockman.LoadingBlocks()) {
4208 [ # # # # : 0 : LogDebug(BCLog::NET, "Ignoring getheaders from peer=%d while importing/reindexing\n", pfrom.GetId());
# # ]
4209 : 0 : return;
4210 : : }
4211 : :
4212 [ + - ]: 1454 : LOCK(cs_main);
4213 : :
4214 : : // Don't serve headers from our active chain until our chainwork is at least
4215 : : // the minimum chain work. This prevents us from starting a low-work headers
4216 : : // sync that will inevitably be aborted by our peer.
4217 [ + - + - : 2908 : if (m_chainman.ActiveTip() == nullptr ||
+ + ]
4218 [ + - + - : 1464 : (m_chainman.ActiveTip()->nChainWork < m_chainman.MinimumChainWork() && !pfrom.HasPermission(NetPermissionFlags::Download))) {
+ - + + ]
4219 [ + - + - : 9 : LogDebug(BCLog::NET, "Ignoring getheaders from peer=%d because active chain has too little work; sending empty response\n", pfrom.GetId());
+ - ]
4220 : : // Just respond with an empty headers message, to tell the peer to
4221 : : // go away but not treat us as unresponsive.
4222 [ + - + - ]: 18 : MakeAndPushMessage(pfrom, NetMsgType::HEADERS, std::vector<CBlockHeader>());
4223 : 9 : return;
4224 : : }
4225 : :
4226 : 1445 : CNodeState *nodestate = State(pfrom.GetId());
4227 : 1445 : const CBlockIndex* pindex = nullptr;
4228 [ + + ]: 1445 : if (locator.IsNull())
4229 : : {
4230 : : // If locator is null, return the hashStop block
4231 [ + - ]: 6 : pindex = m_chainman.m_blockman.LookupBlockIndex(hashStop);
4232 [ + - ]: 6 : if (!pindex) {
4233 : : return;
4234 : : }
4235 : :
4236 [ + - + + ]: 6 : if (!BlockRequestAllowed(pindex)) {
4237 [ + - + - : 2 : LogDebug(BCLog::NET, "%s: ignoring request from peer=%i for old block header that isn't in the main chain\n", __func__, pfrom.GetId());
+ - ]
4238 : 2 : return;
4239 : : }
4240 : : }
4241 : : else
4242 : : {
4243 : : // Find the last block the caller has in the main chain
4244 [ + - + - ]: 1439 : pindex = m_chainman.ActiveChainstate().FindForkInGlobalIndex(locator);
4245 [ + - ]: 1439 : if (pindex)
4246 [ + - ]: 1439 : pindex = m_chainman.ActiveChain().Next(pindex);
4247 : : }
4248 : :
4249 : : // we must use CBlocks, as CBlockHeaders won't include the 0x00 nTx count at the end
4250 : 1443 : std::vector<CBlock> vHeaders;
4251 : 1443 : int nLimit = m_opts.max_headers_result;
4252 [ + - + - : 2886 : LogDebug(BCLog::NET, "getheaders %d to %s from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), pfrom.GetId());
+ + + - +
- + + +
- ]
4253 [ + - + + ]: 252182 : for (; pindex; pindex = m_chainman.ActiveChain().Next(pindex))
4254 : : {
4255 [ + - ]: 250771 : vHeaders.emplace_back(pindex->GetBlockHeader());
4256 [ + + + + ]: 250771 : if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
4257 : : break;
4258 : : }
4259 : : // pindex can be nullptr either if we sent m_chainman.ActiveChain().Tip() OR
4260 : : // if our peer has m_chainman.ActiveChain().Tip() (and thus we are sending an empty
4261 : : // headers message). In both cases it's safe to update
4262 : : // pindexBestHeaderSent to be our tip.
4263 : : //
4264 : : // It is important that we simply reset the BestHeaderSent value here,
4265 : : // and not max(BestHeaderSent, newHeaderSent). We might have announced
4266 : : // the currently-being-connected tip using a compact block, which
4267 : : // resulted in the peer sending a headers request, which we respond to
4268 : : // without the new block. By resetting the BestHeaderSent, we ensure we
4269 : : // will re-announce the new block via headers (or compact blocks again)
4270 : : // in the SendMessages logic.
4271 [ + + + - : 1443 : nodestate->pindexBestHeaderSent = pindex ? pindex : m_chainman.ActiveChain().Tip();
+ - ]
4272 [ + - + - ]: 1443 : MakeAndPushMessage(pfrom, NetMsgType::HEADERS, TX_WITH_WITNESS(vHeaders));
4273 : 1443 : return;
4274 : 4352 : }
4275 : :
4276 [ + + ]: 94702 : if (msg_type == NetMsgType::TX) {
4277 [ + + ]: 11764 : if (RejectIncomingTxs(pfrom)) {
4278 [ + - + - : 4 : LogDebug(BCLog::NET, "transaction sent in violation of protocol, %s", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
4279 : 2 : pfrom.fDisconnect = true;
4280 : 2 : return;
4281 : : }
4282 : :
4283 : : // Stop processing the transaction early if we are still in IBD since we don't
4284 : : // have enough information to validate it yet. Sending unsolicited transactions
4285 : : // is not considered a protocol violation, so don't punish the peer.
4286 [ + - + + ]: 11762 : if (m_chainman.IsInitialBlockDownload()) return;
4287 : :
4288 : 11761 : CTransactionRef ptx;
4289 [ + + ]: 11761 : vRecv >> TX_WITH_WITNESS(ptx);
4290 [ + + ]: 11759 : const CTransaction& tx = *ptx;
4291 : :
4292 [ + + ]: 11759 : const uint256& txid = ptx->GetHash();
4293 : 11759 : const uint256& wtxid = ptx->GetWitnessHash();
4294 : :
4295 [ + + ]: 11759 : const uint256& hash = peer->m_wtxid_relay ? wtxid : txid;
4296 [ + - ]: 11759 : AddKnownTx(*peer, hash);
4297 : :
4298 [ + - + - ]: 11759 : LOCK2(cs_main, m_tx_download_mutex);
4299 : :
4300 [ + - + + ]: 11759 : const auto& [should_validate, package_to_validate] = m_txdownloadman.ReceivedTx(pfrom.GetId(), ptx);
4301 [ + + ]: 11759 : if (!should_validate) {
4302 [ + + ]: 67 : if (pfrom.HasPermission(NetPermissionFlags::ForceRelay)) {
4303 : : // Always relay transactions received from peers with forcerelay
4304 : : // permission, even if they were already in the mempool, allowing
4305 : : // the node to function as a gateway for nodes hidden behind it.
4306 [ + - + + ]: 2 : if (!m_mempool.exists(GenTxid::Txid(tx.GetHash()))) {
4307 [ + - + - : 2 : LogPrintf("Not relaying non-mempool transaction %s (wtxid=%s) from forcerelay peer=%d\n",
+ - ]
4308 : : tx.GetHash().ToString(), tx.GetWitnessHash().ToString(), pfrom.GetId());
4309 : : } else {
4310 [ + - + - : 2 : LogPrintf("Force relaying tx %s (wtxid=%s) from peer=%d\n",
+ - ]
4311 : : tx.GetHash().ToString(), tx.GetWitnessHash().ToString(), pfrom.GetId());
4312 [ + - ]: 1 : RelayTransaction(tx.GetHash(), tx.GetWitnessHash());
4313 : : }
4314 : : }
4315 : :
4316 [ + + ]: 67 : if (package_to_validate) {
4317 [ + - + - ]: 17 : const auto package_result{ProcessNewPackage(m_chainman.ActiveChainstate(), m_mempool, package_to_validate->m_txns, /*test_accept=*/false, /*client_maxfeerate=*/std::nullopt)};
4318 [ + - + - : 37 : LogDebug(BCLog::TXPACKAGES, "package evaluation for %s: %s\n", package_to_validate->ToString(),
+ + + - +
- ]
4319 : : package_result.m_state.IsValid() ? "package accepted" : "package rejected");
4320 [ + - + - ]: 17 : ProcessPackageResult(package_to_validate.value(), package_result);
4321 : 17 : }
4322 : 67 : return;
4323 : : }
4324 : :
4325 : : // ReceivedTx should not be telling us to validate the tx and a package.
4326 [ + - ]: 11692 : Assume(!package_to_validate.has_value());
4327 : :
4328 [ + - ]: 11692 : const MempoolAcceptResult result = m_chainman.ProcessTransaction(ptx);
4329 : 11692 : const TxValidationState& state = result.m_state;
4330 : :
4331 [ + + ]: 11692 : if (result.m_result_type == MempoolAcceptResult::ResultType::VALID) {
4332 [ + - ]: 11142 : ProcessValidTx(pfrom.GetId(), ptx, result.m_replaced_transactions);
4333 : 11142 : pfrom.m_last_tx_time = GetTime<std::chrono::seconds>();
4334 : : }
4335 [ + + ]: 11692 : if (state.IsInvalid()) {
4336 [ + - + + ]: 550 : if (auto package_to_validate{ProcessInvalidTx(pfrom.GetId(), ptx, state, /*first_time_failure=*/true)}) {
4337 [ + - + - ]: 8 : const auto package_result{ProcessNewPackage(m_chainman.ActiveChainstate(), m_mempool, package_to_validate->m_txns, /*test_accept=*/false, /*client_maxfeerate=*/std::nullopt)};
4338 [ + - + - : 17 : LogDebug(BCLog::TXPACKAGES, "package evaluation for %s: %s\n", package_to_validate->ToString(),
+ + + - +
- ]
4339 : : package_result.m_state.IsValid() ? "package accepted" : "package rejected");
4340 [ + - + - ]: 8 : ProcessPackageResult(package_to_validate.value(), package_result);
4341 : 558 : }
4342 : : }
4343 : :
4344 : 11692 : return;
4345 [ + - + - : 58730 : }
+ - ]
4346 : :
4347 [ + + ]: 82938 : if (msg_type == NetMsgType::CMPCTBLOCK)
4348 : : {
4349 : : // Ignore cmpctblock received while importing
4350 [ - + ]: 23642 : if (m_chainman.m_blockman.LoadingBlocks()) {
4351 [ # # # # : 0 : LogDebug(BCLog::NET, "Unexpected cmpctblock message received from peer %d\n", pfrom.GetId());
# # ]
4352 : 0 : return;
4353 : : }
4354 : :
4355 : 23642 : CBlockHeaderAndShortTxIDs cmpctblock;
4356 [ + - ]: 23642 : vRecv >> cmpctblock;
4357 : :
4358 : 23642 : bool received_new_header = false;
4359 [ + - ]: 23642 : const auto blockhash = cmpctblock.header.GetHash();
4360 : :
4361 : 23642 : {
4362 [ + - ]: 23642 : LOCK(cs_main);
4363 : :
4364 [ + - ]: 23642 : const CBlockIndex* prev_block = m_chainman.m_blockman.LookupBlockIndex(cmpctblock.header.hashPrevBlock);
4365 [ + + ]: 23642 : if (!prev_block) {
4366 : : // Doesn't connect (or is genesis), instead of DoSing in AcceptBlockHeader, request deeper headers
4367 [ + - + - ]: 71 : if (!m_chainman.IsInitialBlockDownload()) {
4368 [ + - + - ]: 142 : MaybeSendGetHeaders(pfrom, GetLocator(m_chainman.m_best_header), *peer);
4369 : : }
4370 : 71 : return;
4371 [ + - + - : 23571 : } else if (prev_block->nChainWork + CalculateClaimedHeadersWork({{cmpctblock.header}}) < GetAntiDoSWorkThreshold()) {
+ - + + ]
4372 : : // If we get a low-work header in a compact block, we can ignore it.
4373 [ + - + - : 23 : LogDebug(BCLog::NET, "Ignoring low-work compact block from peer %d\n", pfrom.GetId());
+ - ]
4374 : 23 : return;
4375 : : }
4376 : :
4377 [ + - + + ]: 23548 : if (!m_chainman.m_blockman.LookupBlockIndex(blockhash)) {
4378 : 19621 : received_new_header = true;
4379 : : }
4380 : 94 : }
4381 : :
4382 : 23548 : const CBlockIndex *pindex = nullptr;
4383 [ + - ]: 23548 : BlockValidationState state;
4384 [ + - + + ]: 23548 : if (!m_chainman.ProcessNewBlockHeaders({{cmpctblock.header}}, /*min_pow_checked=*/true, state, &pindex)) {
4385 [ + - ]: 1 : if (state.IsInvalid()) {
4386 [ + - + - ]: 1 : MaybePunishNodeForBlock(pfrom.GetId(), state, /*via_compact_block=*/true, "invalid header via cmpctblock");
4387 : 1 : return;
4388 : : }
4389 : : }
4390 : :
4391 : : // If AcceptBlockHeader returned true, it set pindex
4392 [ + - ]: 23547 : Assert(pindex);
4393 [ + + ]: 23547 : if (received_new_header) {
4394 [ + - ]: 19620 : LogBlockHeader(*pindex, pfrom, /*via_compact_block=*/true);
4395 : : }
4396 : :
4397 : 23547 : bool fProcessBLOCKTXN = false;
4398 : :
4399 : : // If we end up treating this as a plain headers message, call that as well
4400 : : // without cs_main.
4401 : 23547 : bool fRevertToHeaderProcessing = false;
4402 : :
4403 : : // Keep a CBlock for "optimistic" compactblock reconstructions (see
4404 : : // below)
4405 [ + - ]: 23547 : std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
4406 : 23547 : bool fBlockReconstructed = false;
4407 : :
4408 : 23547 : {
4409 [ + - ]: 23547 : LOCK(cs_main);
4410 [ + - ]: 23547 : UpdateBlockAvailability(pfrom.GetId(), pindex->GetBlockHash());
4411 : :
4412 : 23547 : CNodeState *nodestate = State(pfrom.GetId());
4413 : :
4414 : : // If this was a new header with more work than our tip, update the
4415 : : // peer's last block announcement time
4416 [ + + + - : 43167 : if (received_new_header && pindex->nChainWork > m_chainman.ActiveChain().Tip()->nChainWork) {
+ - + - +
+ ]
4417 [ + - ]: 19505 : nodestate->m_last_block_announcement = GetTime();
4418 : : }
4419 : :
4420 [ + + ]: 23547 : if (pindex->nStatus & BLOCK_HAVE_DATA) // Nothing to do here
4421 : : return;
4422 : :
4423 : 20419 : auto range_flight = mapBlocksInFlight.equal_range(pindex->GetBlockHash());
4424 : 20419 : size_t already_in_flight = std::distance(range_flight.first, range_flight.second);
4425 : 20419 : bool requested_block_from_this_peer{false};
4426 : :
4427 : : // Multimap ensures ordering of outstanding requests. It's either empty or first in line.
4428 [ + + + + ]: 20419 : bool first_in_flight = already_in_flight == 0 || (range_flight.first->second.first == pfrom.GetId());
4429 : :
4430 [ + + ]: 20978 : while (range_flight.first != range_flight.second) {
4431 [ + + ]: 805 : if (range_flight.first->second.first == pfrom.GetId()) {
4432 : : requested_block_from_this_peer = true;
4433 : : break;
4434 : : }
4435 : 559 : range_flight.first++;
4436 : : }
4437 : :
4438 [ + - + - : 40838 : if (pindex->nChainWork <= m_chainman.ActiveChain().Tip()->nChainWork || // We know something better
+ - + + ]
4439 [ + - ]: 20300 : pindex->nTx != 0) { // We had this block at some point, but pruned it
4440 [ + + ]: 119 : if (requested_block_from_this_peer) {
4441 : : // We requested this block for some reason, but our mempool will probably be useless
4442 : : // so we just grab the block via normal getdata
4443 [ + - ]: 4 : std::vector<CInv> vInv(1);
4444 [ + - ]: 4 : vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(*peer), blockhash);
4445 [ + - + - ]: 8 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, vInv);
4446 : 4 : }
4447 : 119 : return;
4448 : : }
4449 : :
4450 : : // If we're not close to tip yet, give up and let parallel block fetch work its magic
4451 [ + + + - : 20300 : if (!already_in_flight && !CanDirectFetch()) {
+ + ]
4452 : : return;
4453 : : }
4454 : :
4455 : : // We want to be a bit conservative just to be extra careful about DoS
4456 : : // possibilities in compact block processing...
4457 [ + - + + ]: 20208 : if (pindex->nHeight <= m_chainman.ActiveChain().Height() + 2) {
4458 [ + - + + : 16438 : if ((already_in_flight < MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK && nodestate->vBlocksInFlight.size() < MAX_BLOCKS_IN_TRANSIT_PER_PEER) ||
+ - ]
4459 : : requested_block_from_this_peer) {
4460 : 16437 : std::list<QueuedBlock>::iterator* queuedBlockIt = nullptr;
4461 [ + - + + ]: 16437 : if (!BlockRequested(pfrom.GetId(), *pindex, &queuedBlockIt)) {
4462 [ + - ]: 242 : if (!(*queuedBlockIt)->partialBlock)
4463 [ + - - + ]: 242 : (*queuedBlockIt)->partialBlock.reset(new PartiallyDownloadedBlock(&m_mempool));
4464 : : else {
4465 : : // The block was already in flight using compact blocks from the same peer
4466 [ # # # # : 0 : LogDebug(BCLog::NET, "Peer sent us compact block we were already syncing!\n");
# # ]
4467 : 0 : return;
4468 : : }
4469 : : }
4470 : :
4471 [ + - ]: 16437 : PartiallyDownloadedBlock& partialBlock = *(*queuedBlockIt)->partialBlock;
4472 [ + - ]: 16437 : ReadStatus status = partialBlock.InitData(cmpctblock, vExtraTxnForCompact);
4473 [ + + ]: 16437 : if (status == READ_STATUS_INVALID) {
4474 [ + - ]: 1 : RemoveBlockRequest(pindex->GetBlockHash(), pfrom.GetId()); // Reset in-flight state in case Misbehaving does not result in a disconnect
4475 [ + - + - ]: 1 : Misbehaving(*peer, "invalid compact block");
4476 : 1 : return;
4477 [ - + ]: 16436 : } else if (status == READ_STATUS_FAILED) {
4478 [ # # ]: 0 : if (first_in_flight) {
4479 : : // Duplicate txindexes, the block is now in-flight, so just request it
4480 [ # # ]: 0 : std::vector<CInv> vInv(1);
4481 [ # # ]: 0 : vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(*peer), blockhash);
4482 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, vInv);
4483 : 0 : } else {
4484 : : // Give up for this peer and wait for other peer(s)
4485 [ # # ]: 0 : RemoveBlockRequest(pindex->GetBlockHash(), pfrom.GetId());
4486 : : }
4487 : 0 : return;
4488 : : }
4489 : :
4490 : 16436 : BlockTransactionsRequest req;
4491 [ + + ]: 45128 : for (size_t i = 0; i < cmpctblock.BlockTxCount(); i++) {
4492 [ + - + + ]: 28692 : if (!partialBlock.IsTxAvailable(i))
4493 [ + - ]: 28692 : req.indexes.push_back(i);
4494 : : }
4495 [ + + ]: 16436 : if (req.indexes.empty()) {
4496 : : fProcessBLOCKTXN = true;
4497 [ + + ]: 567 : } else if (first_in_flight) {
4498 : : // We will try to round-trip any compact blocks we get on failure,
4499 : : // as long as it's first...
4500 : 550 : req.blockhash = pindex->GetBlockHash();
4501 [ + - + - ]: 1100 : MakeAndPushMessage(pfrom, NetMsgType::GETBLOCKTXN, req);
4502 : 34 : } else if (pfrom.m_bip152_highbandwidth_to &&
4503 [ + + + + ]: 24 : (!pfrom.IsInboundConn() ||
4504 [ + - + + ]: 13 : IsBlockRequestedFromOutbound(blockhash) ||
4505 [ + - ]: 17 : already_in_flight < MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK - 1)) {
4506 : : // ... or it's a hb relay peer and:
4507 : : // - peer is outbound, or
4508 : : // - we already have an outbound attempt in flight(so we'll take what we can get), or
4509 : : // - it's not the final parallel download slot (which we may reserve for first outbound)
4510 : 14 : req.blockhash = pindex->GetBlockHash();
4511 [ + - + - ]: 28 : MakeAndPushMessage(pfrom, NetMsgType::GETBLOCKTXN, req);
4512 : : } else {
4513 : : // Give up for this peer and wait for other peer(s)
4514 [ + - ]: 3 : RemoveBlockRequest(pindex->GetBlockHash(), pfrom.GetId());
4515 : : }
4516 : 16436 : } else {
4517 : : // This block is either already in flight from a different
4518 : : // peer, or this peer has too many blocks outstanding to
4519 : : // download from.
4520 : : // Optimistically try to reconstruct anyway since we might be
4521 : : // able to without any round trips.
4522 : 1 : PartiallyDownloadedBlock tempBlock(&m_mempool);
4523 [ + - ]: 1 : ReadStatus status = tempBlock.InitData(cmpctblock, vExtraTxnForCompact);
4524 [ - + ]: 1 : if (status != READ_STATUS_OK) {
4525 : : // TODO: don't ignore failures
4526 : 0 : return;
4527 : : }
4528 : 1 : std::vector<CTransactionRef> dummy;
4529 [ + - ]: 1 : status = tempBlock.FillBlock(*pblock, dummy);
4530 [ + - ]: 1 : if (status == READ_STATUS_OK) {
4531 : 1 : fBlockReconstructed = true;
4532 : : }
4533 : 2 : }
4534 : : } else {
4535 [ - + ]: 3770 : if (requested_block_from_this_peer) {
4536 : : // We requested this block, but its far into the future, so our
4537 : : // mempool will probably be useless - request the block normally
4538 [ # # ]: 0 : std::vector<CInv> vInv(1);
4539 [ # # ]: 0 : vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(*peer), blockhash);
4540 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, vInv);
4541 : 0 : return;
4542 : 0 : } else {
4543 : : // If this was an announce-cmpctblock, we want the same treatment as a header message
4544 : : fRevertToHeaderProcessing = true;
4545 : : }
4546 : : }
4547 : 3340 : } // cs_main
4548 : :
4549 [ + + ]: 20207 : if (fProcessBLOCKTXN) {
4550 : 15869 : BlockTransactions txn;
4551 : 15869 : txn.blockhash = blockhash;
4552 [ + - ]: 15869 : return ProcessCompactBlockTxns(pfrom, *peer, txn);
4553 : 15869 : }
4554 : :
4555 [ + + ]: 4338 : if (fRevertToHeaderProcessing) {
4556 : : // Headers received from HB compact block peers are permitted to be
4557 : : // relayed before full validation (see BIP 152), so we don't want to disconnect
4558 : : // the peer if the header turns out to be for an invalid block.
4559 : : // Note that if a peer tries to build on an invalid chain, that
4560 : : // will be detected and the peer will be disconnected/discouraged.
4561 [ + - + - ]: 7540 : return ProcessHeadersMessage(pfrom, *peer, {cmpctblock.header}, /*via_compact_block=*/true);
4562 : : }
4563 : :
4564 [ + + ]: 568 : if (fBlockReconstructed) {
4565 : : // If we got here, we were able to optimistically reconstruct a
4566 : : // block that is in flight from some other peer.
4567 : 1 : {
4568 [ + - ]: 1 : LOCK(cs_main);
4569 [ + - + - ]: 1 : mapBlockSource.emplace(pblock->GetHash(), std::make_pair(pfrom.GetId(), false));
4570 : 0 : }
4571 : : // Setting force_processing to true means that we bypass some of
4572 : : // our anti-DoS protections in AcceptBlock, which filters
4573 : : // unrequested blocks that might be trying to waste our resources
4574 : : // (eg disk space). Because we only try to reconstruct blocks when
4575 : : // we're close to caught up (via the CanDirectFetch() requirement
4576 : : // above, combined with the behavior of not requesting blocks until
4577 : : // we have a chain with at least the minimum chain work), and we ignore
4578 : : // compact blocks with less work than our tip, it is safe to treat
4579 : : // reconstructed compact blocks as having been requested.
4580 [ + - + - ]: 2 : ProcessBlock(pfrom, pblock, /*force_processing=*/true, /*min_pow_checked=*/true);
4581 [ + - ]: 1 : LOCK(cs_main); // hold cs_main for CBlockIndex::IsValid()
4582 [ + - + - : 2 : if (pindex->IsValid(BLOCK_VALID_TRANSACTIONS)) {
+ - ]
4583 : : // Clear download state for this block, which is in
4584 : : // process from some other peer. We do this after calling
4585 : : // ProcessNewBlock so that a malleated cmpctblock announcement
4586 : : // can't be used to interfere with block relay.
4587 [ + - + - ]: 1 : RemoveBlockRequest(pblock->GetHash(), std::nullopt);
4588 : : }
4589 : 1 : }
4590 : 568 : return;
4591 : 70737 : }
4592 : :
4593 [ + + ]: 59296 : if (msg_type == NetMsgType::BLOCKTXN)
4594 : : {
4595 : : // Ignore blocktxn received while importing
4596 [ - + ]: 560 : if (m_chainman.m_blockman.LoadingBlocks()) {
4597 [ # # # # : 0 : LogDebug(BCLog::NET, "Unexpected blocktxn message received from peer %d\n", pfrom.GetId());
# # ]
4598 : 0 : return;
4599 : : }
4600 : :
4601 : 560 : BlockTransactions resp;
4602 [ + - ]: 560 : vRecv >> resp;
4603 : :
4604 [ + - ]: 560 : return ProcessCompactBlockTxns(pfrom, *peer, resp);
4605 : 560 : }
4606 : :
4607 [ + + ]: 58736 : if (msg_type == NetMsgType::HEADERS)
4608 : : {
4609 : : // Ignore headers received while importing
4610 [ - + ]: 5427 : if (m_chainman.m_blockman.LoadingBlocks()) {
4611 [ # # # # : 0 : LogDebug(BCLog::NET, "Unexpected headers message received from peer %d\n", pfrom.GetId());
# # ]
4612 : 0 : return;
4613 : : }
4614 : :
4615 : 5427 : std::vector<CBlockHeader> headers;
4616 : :
4617 : : // Bypass the normal CBlock deserialization, as we don't want to risk deserializing 2000 full blocks.
4618 [ + - ]: 5427 : unsigned int nCount = ReadCompactSize(vRecv);
4619 [ + + ]: 5427 : if (nCount > m_opts.max_headers_result) {
4620 [ + - + - ]: 1 : Misbehaving(*peer, strprintf("headers message size = %u", nCount));
4621 : 1 : return;
4622 : : }
4623 [ + - ]: 5426 : headers.resize(nCount);
4624 [ + + ]: 288193 : for (unsigned int n = 0; n < nCount; n++) {
4625 [ + - ]: 282767 : vRecv >> headers[n];
4626 [ + - ]: 282767 : ReadCompactSize(vRecv); // ignore tx count; assume it is 0.
4627 : : }
4628 : :
4629 [ + - ]: 5426 : ProcessHeadersMessage(pfrom, *peer, std::move(headers), /*via_compact_block=*/false);
4630 : :
4631 : : // Check if the headers presync progress needs to be reported to validation.
4632 : : // This needs to be done without holding the m_headers_presync_mutex lock.
4633 [ + + ]: 5426 : if (m_headers_presync_should_signal.exchange(false)) {
4634 : 7 : HeadersPresyncStats stats;
4635 : 7 : {
4636 [ + - ]: 7 : LOCK(m_headers_presync_mutex);
4637 : 7 : auto it = m_headers_presync_stats.find(m_headers_presync_bestpeer);
4638 [ + - ]: 7 : if (it != m_headers_presync_stats.end()) stats = it->second;
4639 : 7 : }
4640 [ + - ]: 7 : if (stats.second) {
4641 [ + - ]: 7 : m_chainman.ReportHeadersPresync(stats.first, stats.second->first, stats.second->second);
4642 : : }
4643 : : }
4644 : :
4645 : 5426 : return;
4646 : 5427 : }
4647 : :
4648 [ + + ]: 53309 : if (msg_type == NetMsgType::BLOCK)
4649 : : {
4650 : : // Ignore block received while importing
4651 [ - + ]: 41707 : if (m_chainman.m_blockman.LoadingBlocks()) {
4652 [ # # # # : 0 : LogDebug(BCLog::NET, "Unexpected block message received from peer %d\n", pfrom.GetId());
# # ]
4653 : 0 : return;
4654 : : }
4655 : :
4656 [ + - ]: 41707 : std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
4657 [ + + ]: 41707 : vRecv >> TX_WITH_WITNESS(*pblock);
4658 : :
4659 [ + - + - : 83410 : LogDebug(BCLog::NET, "received block %s peer=%d\n", pblock->GetHash().ToString(), pfrom.GetId());
+ - + - +
- ]
4660 : :
4661 [ + - + - : 125115 : const CBlockIndex* prev_block{WITH_LOCK(m_chainman.GetMutex(), return m_chainman.m_blockman.LookupBlockIndex(pblock->hashPrevBlock))};
+ - ]
4662 : :
4663 : : // Check for possible mutation if it connects to something we know so we can check for DEPLOYMENT_SEGWIT being active
4664 [ + + + - : 83408 : if (prev_block && IsBlockMutated(/*block=*/*pblock,
+ + ]
4665 : 41703 : /*check_witness_root=*/DeploymentActiveAfter(prev_block, m_chainman, Consensus::DEPLOYMENT_SEGWIT))) {
4666 [ + - + - : 278 : LogDebug(BCLog::NET, "Received mutated block from peer=%d\n", peer->m_id);
+ - ]
4667 [ + - + - ]: 278 : Misbehaving(*peer, "mutated block");
4668 [ + - + - : 834 : WITH_LOCK(cs_main, RemoveBlockRequest(pblock->GetHash(), peer->m_id));
+ - ]
4669 : : return;
4670 : : }
4671 : :
4672 : 41427 : bool forceProcessing = false;
4673 [ + - ]: 41427 : const uint256 hash(pblock->GetHash());
4674 : 41427 : bool min_pow_checked = false;
4675 : 41427 : {
4676 [ + - ]: 41427 : LOCK(cs_main);
4677 : : // Always process the block if we requested it, since we may
4678 : : // need it even when it's not a candidate for a new best tip.
4679 : 41427 : forceProcessing = IsBlockRequested(hash);
4680 [ + - ]: 41427 : RemoveBlockRequest(hash, pfrom.GetId());
4681 : : // mapBlockSource is only used for punishing peers and setting
4682 : : // which peers send us compact blocks, so the race between here and
4683 : : // cs_main in ProcessNewBlock is fine.
4684 [ + - ]: 41427 : mapBlockSource.emplace(hash, std::make_pair(pfrom.GetId(), true));
4685 : :
4686 : : // Check claimed work on this block against our anti-dos thresholds.
4687 [ + + + - : 41427 : if (prev_block && prev_block->nChainWork + CalculateClaimedHeadersWork({{pblock->GetBlockHeader()}}) >= GetAntiDoSWorkThreshold()) {
+ - + - +
+ ]
4688 : : min_pow_checked = true;
4689 : : }
4690 : 0 : }
4691 [ + - + - ]: 82854 : ProcessBlock(pfrom, pblock, forceProcessing, min_pow_checked);
4692 : 41427 : return;
4693 : 41707 : }
4694 : :
4695 [ + + ]: 11602 : if (msg_type == NetMsgType::GETADDR) {
4696 : : // This asymmetric behavior for inbound and outbound connections was introduced
4697 : : // to prevent a fingerprinting attack: an attacker can send specific fake addresses
4698 : : // to users' AddrMan and later request them by sending getaddr messages.
4699 : : // Making nodes which are behind NAT and can only make outgoing connections ignore
4700 : : // the getaddr message mitigates the attack.
4701 [ + + ]: 937 : if (!pfrom.IsInboundConn()) {
4702 [ + - + - : 18 : LogDebug(BCLog::NET, "Ignoring \"getaddr\" from %s connection. peer=%d\n", pfrom.ConnectionTypeAsString(), pfrom.GetId());
+ - + - ]
4703 : 9 : return;
4704 : : }
4705 : :
4706 : : // Since this must be an inbound connection, SetupAddressRelay will
4707 : : // never fail.
4708 [ + - ]: 928 : Assume(SetupAddressRelay(pfrom, *peer));
4709 : :
4710 : : // Only send one GetAddr response per connection to reduce resource waste
4711 : : // and discourage addr stamping of INV announcements.
4712 [ + + ]: 928 : if (peer->m_getaddr_recvd) {
4713 [ + - + - : 1 : LogDebug(BCLog::NET, "Ignoring repeated \"getaddr\". peer=%d\n", pfrom.GetId());
+ - ]
4714 : 1 : return;
4715 : : }
4716 : 927 : peer->m_getaddr_recvd = true;
4717 : :
4718 : 927 : peer->m_addrs_to_send.clear();
4719 : 927 : std::vector<CAddress> vAddr;
4720 [ + + ]: 927 : if (pfrom.HasPermission(NetPermissionFlags::Addr)) {
4721 [ + - ]: 72 : vAddr = m_connman.GetAddresses(MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND, /*network=*/std::nullopt);
4722 : : } else {
4723 [ + - ]: 1782 : vAddr = m_connman.GetAddresses(pfrom, MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND);
4724 : : }
4725 [ + + ]: 19848 : for (const CAddress &addr : vAddr) {
4726 [ + - ]: 18921 : PushAddress(*peer, addr);
4727 : : }
4728 : 927 : return;
4729 : 927 : }
4730 : :
4731 [ + + ]: 10665 : if (msg_type == NetMsgType::MEMPOOL) {
4732 : : // Only process received mempool messages if we advertise NODE_BLOOM
4733 : : // or if the peer has mempool permissions.
4734 [ + + - + ]: 4 : if (!(peer->m_our_services & NODE_BLOOM) && !pfrom.HasPermission(NetPermissionFlags::Mempool))
4735 : : {
4736 [ + - ]: 1 : if (!pfrom.HasPermission(NetPermissionFlags::NoBan))
4737 : : {
4738 [ + - + - : 2 : LogDebug(BCLog::NET, "mempool request with bloom filters disabled, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
4739 : 1 : pfrom.fDisconnect = true;
4740 : : }
4741 : 1 : return;
4742 : : }
4743 : :
4744 [ + - + + : 3 : if (m_connman.OutboundTargetReached(false) && !pfrom.HasPermission(NetPermissionFlags::Mempool))
- + ]
4745 : : {
4746 [ + - ]: 1 : if (!pfrom.HasPermission(NetPermissionFlags::NoBan))
4747 : : {
4748 [ + - + - : 2 : LogDebug(BCLog::NET, "mempool request with bandwidth limit reached, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
4749 : 1 : pfrom.fDisconnect = true;
4750 : : }
4751 : 1 : return;
4752 : : }
4753 : :
4754 [ + - + - ]: 2 : if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
4755 [ + - ]: 2 : LOCK(tx_relay->m_tx_inventory_mutex);
4756 [ + - ]: 2 : tx_relay->m_send_mempool = true;
4757 : 2 : }
4758 : 2 : return;
4759 : : }
4760 : :
4761 [ + + ]: 10661 : if (msg_type == NetMsgType::PING) {
4762 [ + - ]: 7174 : if (pfrom.GetCommonVersion() > BIP0031_VERSION) {
4763 : 7174 : uint64_t nonce = 0;
4764 [ + - ]: 7174 : vRecv >> nonce;
4765 : : // Echo the message back with the nonce. This allows for two useful features:
4766 : : //
4767 : : // 1) A remote node can quickly check if the connection is operational
4768 : : // 2) Remote nodes can measure the latency of the network thread. If this node
4769 : : // is overloaded it won't respond to pings quickly and the remote node can
4770 : : // avoid sending us more work, like chain download requests.
4771 : : //
4772 : : // The nonce stops the remote getting confused between different pings: without
4773 : : // it, if the remote node sends a ping once per second and this node takes 5
4774 : : // seconds to respond to each, the 5th ping the remote sends would appear to
4775 : : // return very quickly.
4776 [ + - + - ]: 14348 : MakeAndPushMessage(pfrom, NetMsgType::PONG, nonce);
4777 : : }
4778 : 7174 : return;
4779 : : }
4780 : :
4781 [ + + ]: 3487 : if (msg_type == NetMsgType::PONG) {
4782 : 2399 : const auto ping_end = time_received;
4783 : 2399 : uint64_t nonce = 0;
4784 [ + + ]: 2399 : size_t nAvail = vRecv.in_avail();
4785 : 2399 : bool bPingFinished = false;
4786 [ + + ]: 2399 : std::string sProblem;
4787 : :
4788 [ + + ]: 2399 : if (nAvail >= sizeof(nonce)) {
4789 [ + - ]: 2398 : vRecv >> nonce;
4790 : :
4791 : : // Only process pong message if there is an outstanding ping (old ping without nonce should never pong)
4792 [ + + ]: 2398 : if (peer->m_ping_nonce_sent != 0) {
4793 [ + + ]: 2397 : if (nonce == peer->m_ping_nonce_sent) {
4794 : : // Matching pong received, this ping is no longer outstanding
4795 : 2395 : bPingFinished = true;
4796 [ + - ]: 2395 : const auto ping_time = ping_end - peer->m_ping_start.load();
4797 [ + - ]: 2395 : if (ping_time.count() >= 0) {
4798 : : // Let connman know about this successful ping-pong
4799 : 2395 : pfrom.PongReceived(ping_time);
4800 : : } else {
4801 : : // This should never happen
4802 [ # # ]: 0 : sProblem = "Timing mishap";
4803 : : }
4804 : : } else {
4805 : : // Nonce mismatches are normal when pings are overlapping
4806 [ + - ]: 2 : sProblem = "Nonce mismatch";
4807 [ + + ]: 2 : if (nonce == 0) {
4808 : : // This is most likely a bug in another implementation somewhere; cancel this ping
4809 : 1 : bPingFinished = true;
4810 [ + - ]: 1 : sProblem = "Nonce zero";
4811 : : }
4812 : : }
4813 : : } else {
4814 [ + - ]: 1 : sProblem = "Unsolicited pong without ping";
4815 : : }
4816 : : } else {
4817 : : // This is most likely a bug in another implementation somewhere; cancel this ping
4818 : 1 : bPingFinished = true;
4819 [ + - ]: 1 : sProblem = "Short payload";
4820 : : }
4821 : :
4822 [ + + ]: 2399 : if (!(sProblem.empty())) {
4823 [ + - + - : 4 : LogDebug(BCLog::NET, "pong peer=%d: %s, %x expected, %x received, %u bytes\n",
+ - ]
4824 : : pfrom.GetId(),
4825 : : sProblem,
4826 : : peer->m_ping_nonce_sent,
4827 : : nonce,
4828 : : nAvail);
4829 : : }
4830 [ + + ]: 2399 : if (bPingFinished) {
4831 : 2397 : peer->m_ping_nonce_sent = 0;
4832 : : }
4833 : 2399 : return;
4834 : 2399 : }
4835 : :
4836 [ + + ]: 1088 : if (msg_type == NetMsgType::FILTERLOAD) {
4837 [ + + ]: 10 : if (!(peer->m_our_services & NODE_BLOOM)) {
4838 [ + - + - : 2 : LogDebug(BCLog::NET, "filterload received despite not offering bloom services, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
4839 : 1 : pfrom.fDisconnect = true;
4840 : 1 : return;
4841 : : }
4842 [ + - ]: 9 : CBloomFilter filter;
4843 [ + - ]: 9 : vRecv >> filter;
4844 : :
4845 [ + - + + ]: 9 : if (!filter.IsWithinSizeConstraints())
4846 : : {
4847 : : // There is no excuse for sending a too-large filter
4848 [ + - + - ]: 4 : Misbehaving(*peer, "too-large bloom filter");
4849 [ + - + - ]: 7 : } else if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
4850 : 7 : {
4851 [ + - ]: 7 : LOCK(tx_relay->m_bloom_filter_mutex);
4852 [ + - + - : 7 : tx_relay->m_bloom_filter.reset(new CBloomFilter(filter));
- + ]
4853 [ + - ]: 7 : tx_relay->m_relay_txs = true;
4854 : 0 : }
4855 : 7 : pfrom.m_bloom_filter_loaded = true;
4856 : 7 : pfrom.m_relays_txs = true;
4857 : : }
4858 : 9 : return;
4859 : 9 : }
4860 : :
4861 [ + + ]: 1078 : if (msg_type == NetMsgType::FILTERADD) {
4862 [ + + ]: 7 : if (!(peer->m_our_services & NODE_BLOOM)) {
4863 [ + - + - : 2 : LogDebug(BCLog::NET, "filteradd received despite not offering bloom services, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
4864 : 1 : pfrom.fDisconnect = true;
4865 : 1 : return;
4866 : : }
4867 : 6 : std::vector<unsigned char> vData;
4868 [ + - ]: 6 : vRecv >> vData;
4869 : :
4870 : : // Nodes must NEVER send a data item > MAX_SCRIPT_ELEMENT_SIZE bytes (the max size for a script data object,
4871 : : // and thus, the maximum size any matched object can have) in a filteradd message
4872 : 6 : bool bad = false;
4873 [ + + ]: 6 : if (vData.size() > MAX_SCRIPT_ELEMENT_SIZE) {
4874 : : bad = true;
4875 [ + - + - ]: 5 : } else if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
4876 [ + - ]: 5 : LOCK(tx_relay->m_bloom_filter_mutex);
4877 [ + + ]: 5 : if (tx_relay->m_bloom_filter) {
4878 [ + - ]: 3 : tx_relay->m_bloom_filter->insert(vData);
4879 : : } else {
4880 : : bad = true;
4881 : : }
4882 : 0 : }
4883 [ + + ]: 5 : if (bad) {
4884 [ + - + - ]: 6 : Misbehaving(*peer, "bad filteradd message");
4885 : : }
4886 : 6 : return;
4887 : 6 : }
4888 : :
4889 [ + + ]: 1071 : if (msg_type == NetMsgType::FILTERCLEAR) {
4890 [ + + ]: 5 : if (!(peer->m_our_services & NODE_BLOOM)) {
4891 [ + - + - : 2 : LogDebug(BCLog::NET, "filterclear received despite not offering bloom services, %s\n", pfrom.DisconnectMsg(fLogIPs));
+ - + - ]
4892 : 1 : pfrom.fDisconnect = true;
4893 : 1 : return;
4894 : : }
4895 [ + - ]: 4 : auto tx_relay = peer->GetTxRelay();
4896 [ + - ]: 4 : if (!tx_relay) return;
4897 : :
4898 : 4 : {
4899 [ + - ]: 4 : LOCK(tx_relay->m_bloom_filter_mutex);
4900 [ + - ]: 4 : tx_relay->m_bloom_filter = nullptr;
4901 [ + - ]: 4 : tx_relay->m_relay_txs = true;
4902 : 4 : }
4903 : 4 : pfrom.m_bloom_filter_loaded = false;
4904 : 4 : pfrom.m_relays_txs = true;
4905 : 4 : return;
4906 : : }
4907 : :
4908 [ + + ]: 1066 : if (msg_type == NetMsgType::FEEFILTER) {
4909 : 1040 : CAmount newFeeFilter = 0;
4910 [ + - ]: 1040 : vRecv >> newFeeFilter;
4911 [ + - ]: 1040 : if (MoneyRange(newFeeFilter)) {
4912 [ + - + - ]: 1040 : if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
4913 : 1040 : tx_relay->m_fee_filter_received = newFeeFilter;
4914 : : }
4915 [ + - + - : 2080 : LogDebug(BCLog::NET, "received: feefilter of %s from peer=%d\n", CFeeRate(newFeeFilter).ToString(), pfrom.GetId());
+ - + - ]
4916 : : }
4917 : 1040 : return;
4918 : : }
4919 : :
4920 [ + + ]: 26 : if (msg_type == NetMsgType::GETCFILTERS) {
4921 [ + - ]: 4 : ProcessGetCFilters(pfrom, *peer, vRecv);
4922 : : return;
4923 : : }
4924 : :
4925 [ + + ]: 22 : if (msg_type == NetMsgType::GETCFHEADERS) {
4926 [ + - ]: 5 : ProcessGetCFHeaders(pfrom, *peer, vRecv);
4927 : : return;
4928 : : }
4929 : :
4930 [ + + ]: 17 : if (msg_type == NetMsgType::GETCFCHECKPT) {
4931 [ + - ]: 6 : ProcessGetCFCheckPt(pfrom, *peer, vRecv);
4932 : : return;
4933 : : }
4934 : :
4935 [ + + ]: 11 : if (msg_type == NetMsgType::NOTFOUND) {
4936 : 5 : std::vector<CInv> vInv;
4937 [ + - ]: 5 : vRecv >> vInv;
4938 : 5 : std::vector<uint256> tx_invs;
4939 [ + - ]: 5 : if (vInv.size() <= node::MAX_PEER_TX_ANNOUNCEMENTS + MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
4940 [ + + ]: 10 : for (CInv &inv : vInv) {
4941 [ + + ]: 10 : if (inv.IsGenTxMsg()) {
4942 [ + - ]: 5 : tx_invs.emplace_back(inv.hash);
4943 : : }
4944 : : }
4945 : : }
4946 [ + - ]: 5 : LOCK(m_tx_download_mutex);
4947 [ + - ]: 5 : m_txdownloadman.ReceivedNotFound(pfrom.GetId(), tx_invs);
4948 [ + - ]: 5 : return;
4949 : 5 : }
4950 : :
4951 : : // Ignore unknown commands for extensibility
4952 [ + - + - : 12 : LogDebug(BCLog::NET, "Unknown command \"%s\" from peer=%d\n", SanitizeString(msg_type), pfrom.GetId());
+ - + - ]
4953 : : return;
4954 : 157118 : }
4955 : :
4956 : 378369 : bool PeerManagerImpl::MaybeDiscourageAndDisconnect(CNode& pnode, Peer& peer)
4957 : : {
4958 : 378369 : {
4959 : 378369 : LOCK(peer.m_misbehavior_mutex);
4960 : :
4961 : : // There's nothing to do if the m_should_discourage flag isn't set
4962 [ + + + - ]: 378369 : if (!peer.m_should_discourage) return false;
4963 : :
4964 [ + - ]: 1284 : peer.m_should_discourage = false;
4965 : 377085 : } // peer.m_misbehavior_mutex
4966 : :
4967 [ + + ]: 1284 : if (pnode.HasPermission(NetPermissionFlags::NoBan)) {
4968 : : // We never disconnect or discourage peers for bad behavior if they have NetPermissionFlags::NoBan permission
4969 : 1115 : LogPrintf("Warning: not punishing noban peer %d!\n", peer.m_id);
4970 : 1115 : return false;
4971 : : }
4972 : :
4973 [ + + ]: 169 : if (pnode.IsManualConn()) {
4974 : : // We never disconnect or discourage manual peers for bad behavior
4975 : 37 : LogPrintf("Warning: not punishing manually connected peer %d!\n", peer.m_id);
4976 : 37 : return false;
4977 : : }
4978 : :
4979 [ + + ]: 132 : if (pnode.addr.IsLocal()) {
4980 : : // We disconnect local peers for bad behavior but don't discourage (since that would discourage
4981 : : // all peers on the same local address)
4982 [ + - + - ]: 256 : LogDebug(BCLog::NET, "Warning: disconnecting but not discouraging %s peer %d!\n",
4983 : : pnode.m_inbound_onion ? "inbound onion" : "local", peer.m_id);
4984 : 128 : pnode.fDisconnect = true;
4985 : 128 : return true;
4986 : : }
4987 : :
4988 : : // Normal case: Disconnect the peer and discourage all nodes sharing the address
4989 [ + - ]: 4 : LogDebug(BCLog::NET, "Disconnecting and discouraging peer %d!\n", peer.m_id);
4990 [ + - ]: 4 : if (m_banman) m_banman->Discourage(pnode.addr);
4991 : 4 : m_connman.DisconnectNode(pnode.addr);
4992 : 4 : return true;
4993 : : }
4994 : :
4995 : 378366 : bool PeerManagerImpl::ProcessMessages(CNode* pfrom, std::atomic<bool>& interruptMsgProc)
4996 : : {
4997 : 378366 : AssertLockNotHeld(m_tx_download_mutex);
4998 : 378366 : AssertLockHeld(g_msgproc_mutex);
4999 : :
5000 : 378366 : PeerRef peer = GetPeerRef(pfrom->GetId());
5001 [ + - ]: 378366 : if (peer == nullptr) return false;
5002 : :
5003 : : // For outbound connections, ensure that the initial VERSION message
5004 : : // has been sent first before processing any incoming messages
5005 [ + + + + ]: 378366 : if (!pfrom->IsInboundConn() && !peer->m_outbound_version_message_sent) return false;
5006 : :
5007 : 377784 : {
5008 [ + - ]: 377784 : LOCK(peer->m_getdata_requests_mutex);
5009 [ + + ]: 377784 : if (!peer->m_getdata_requests.empty()) {
5010 [ + - ]: 1882 : ProcessGetData(*pfrom, *peer, interruptMsgProc);
5011 : : }
5012 : 0 : }
5013 : :
5014 [ + - ]: 377784 : const bool processed_orphan = ProcessOrphanTx(*peer);
5015 : :
5016 [ + - ]: 377784 : if (pfrom->fDisconnect)
5017 : : return false;
5018 : :
5019 [ + + ]: 377784 : if (processed_orphan) return true;
5020 : :
5021 : : // this maintains the order of responses
5022 : : // and prevents m_getdata_requests to grow unbounded
5023 : 377662 : {
5024 [ + - ]: 377662 : LOCK(peer->m_getdata_requests_mutex);
5025 [ + + + - ]: 377662 : if (!peer->m_getdata_requests.empty()) return true;
5026 : 1282 : }
5027 : :
5028 : : // Don't bother if send buffer is too full to respond anyway
5029 [ + + ]: 376380 : if (pfrom->fPauseSend) return false;
5030 : :
5031 [ + - ]: 376136 : auto poll_result{pfrom->PollMessage()};
5032 [ + + ]: 376136 : if (!poll_result) {
5033 : : // No message to process
5034 : : return false;
5035 : : }
5036 : :
5037 [ + + ]: 157128 : CNetMessage& msg{poll_result->first};
5038 : 157128 : bool fMoreWork = poll_result->second;
5039 : :
5040 : : TRACEPOINT(net, inbound_message,
5041 : : pfrom->GetId(),
5042 : : pfrom->m_addr_name.c_str(),
5043 : : pfrom->ConnectionTypeAsString().c_str(),
5044 : : msg.m_type.c_str(),
5045 : : msg.m_recv.size(),
5046 : : msg.m_recv.data()
5047 : 157128 : );
5048 : :
5049 [ + + ]: 157128 : if (m_opts.capture_messages) {
5050 [ + - ]: 7 : CaptureMessage(pfrom->addr, msg.m_type, MakeUCharSpan(msg.m_recv), /*is_incoming=*/true);
5051 : : }
5052 : :
5053 : 157128 : try {
5054 [ + + ]: 157128 : ProcessMessage(*pfrom, msg.m_type, msg.m_recv, msg.m_time, interruptMsgProc);
5055 [ + + ]: 157116 : if (interruptMsgProc) return false;
5056 : 157109 : {
5057 [ + - ]: 157109 : LOCK(peer->m_getdata_requests_mutex);
5058 [ + + ]: 157109 : if (!peer->m_getdata_requests.empty()) fMoreWork = true;
5059 : 157109 : }
5060 : : // Does this peer has an orphan ready to reconsider?
5061 : : // (Note: we may have provided a parent for an orphan provided
5062 : : // by another peer that was already processed; in that case,
5063 : : // the extra work may not be noticed, possibly resulting in an
5064 : : // unnecessary 100ms delay)
5065 [ + - ]: 157109 : LOCK(m_tx_download_mutex);
5066 [ + - + + ]: 157109 : if (m_txdownloadman.HaveMoreWork(peer->m_id)) fMoreWork = true;
5067 [ + - ]: 157121 : } catch (const std::exception& e) {
5068 [ + - + - : 24 : LogDebug(BCLog::NET, "%s(%s, %u bytes): Exception '%s' (%s) caught\n", __func__, SanitizeString(msg.m_type), msg.m_message_size, e.what(), typeid(e).name());
- + + - +
- ]
5069 : 12 : } catch (...) {
5070 [ - - - - : 0 : LogDebug(BCLog::NET, "%s(%s, %u bytes): Unknown exception caught\n", __func__, SanitizeString(msg.m_type), msg.m_message_size);
- - - - ]
5071 [ - - ]: 0 : }
5072 : :
5073 : : return fMoreWork;
5074 : 754502 : }
5075 : :
5076 : 373268 : void PeerManagerImpl::ConsiderEviction(CNode& pto, Peer& peer, std::chrono::seconds time_in_seconds)
5077 : : {
5078 : 373268 : AssertLockHeld(cs_main);
5079 : :
5080 : 373268 : CNodeState &state = *State(pto.GetId());
5081 : :
5082 [ + + + + : 373268 : if (!state.m_chain_sync.m_protect && pto.IsOutboundOrBlockRelayConn() && state.fSyncStarted) {
+ + ]
5083 : : // This is an outbound peer subject to disconnection if they don't
5084 : : // announce a block with as much work as the current tip within
5085 : : // CHAIN_SYNC_TIMEOUT + HEADERS_RESPONSE_TIME seconds (note: if
5086 : : // their chain has more work than ours, we should sync to it,
5087 : : // unless it's invalid, in which case we should find that out and
5088 : : // disconnect from them elsewhere).
5089 [ + + + - : 6387 : if (state.pindexBestKnownBlock != nullptr && state.pindexBestKnownBlock->nChainWork >= m_chainman.ActiveChain().Tip()->nChainWork) {
+ + ]
5090 : : // The outbound peer has sent us a block with at least as much work as our current tip, so reset the timeout if it was set
5091 [ + + ]: 125 : if (state.m_chain_sync.m_timeout != 0s) {
5092 : 5 : state.m_chain_sync.m_timeout = 0s;
5093 : 5 : state.m_chain_sync.m_work_header = nullptr;
5094 : 5 : state.m_chain_sync.m_sent_getheaders = false;
5095 : : }
5096 [ + + + - : 5835 : } else if (state.m_chain_sync.m_timeout == 0s || (state.m_chain_sync.m_work_header != nullptr && state.pindexBestKnownBlock != nullptr && state.pindexBestKnownBlock->nChainWork >= state.m_chain_sync.m_work_header->nChainWork)) {
+ + + + ]
5097 : : // At this point we know that the outbound peer has either never sent us a block/header or they have, but its tip is behind ours
5098 : : // AND
5099 : : // we are noticing this for the first time (m_timeout is 0)
5100 : : // OR we noticed this at some point within the last CHAIN_SYNC_TIMEOUT + HEADERS_RESPONSE_TIME seconds and set a timeout
5101 : : // for them, they caught up to our tip at the time of setting the timer but not to our current one (we've also advanced).
5102 : : // Either way, set a new timeout based on our current tip.
5103 : 111 : state.m_chain_sync.m_timeout = time_in_seconds + CHAIN_SYNC_TIMEOUT;
5104 [ + - ]: 111 : state.m_chain_sync.m_work_header = m_chainman.ActiveChain().Tip();
5105 : 111 : state.m_chain_sync.m_sent_getheaders = false;
5106 [ + - + + ]: 5724 : } else if (state.m_chain_sync.m_timeout > 0s && time_in_seconds > state.m_chain_sync.m_timeout) {
5107 : : // No evidence yet that our peer has synced to a chain with work equal to that
5108 : : // of our tip, when we first detected it was behind. Send a single getheaders
5109 : : // message to give the peer a chance to update us.
5110 [ + + ]: 29 : if (state.m_chain_sync.m_sent_getheaders) {
5111 : : // They've run out of time to catch up!
5112 [ + + + - : 16 : LogInfo("Outbound peer has old chain, best known block = %s, %s\n", state.pindexBestKnownBlock != nullptr ? state.pindexBestKnownBlock->GetBlockHash().ToString() : "<none>", pto.DisconnectMsg(fLogIPs));
+ - + - ]
5113 : 8 : pto.fDisconnect = true;
5114 : : } else {
5115 [ - + ]: 21 : assert(state.m_chain_sync.m_work_header);
5116 : : // Here, we assume that the getheaders message goes out,
5117 : : // because it'll either go out or be skipped because of a
5118 : : // getheaders in-flight already, in which case the peer should
5119 : : // still respond to us with a sufficiently high work chain tip.
5120 [ + - ]: 21 : MaybeSendGetHeaders(pto,
5121 : 21 : GetLocator(state.m_chain_sync.m_work_header->pprev),
5122 : : peer);
5123 [ + - + + : 42 : LogDebug(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());
+ - + - +
- ]
5124 : 21 : state.m_chain_sync.m_sent_getheaders = true;
5125 : : // Bump the timeout to allow a response, which could clear the timeout
5126 : : // (if the response shows the peer has synced), reset the timeout (if
5127 : : // the peer syncs to the required work but not to our tip), or result
5128 : : // in disconnect (if we advance to the timeout and pindexBestKnownBlock
5129 : : // has not sufficiently progressed)
5130 : 21 : state.m_chain_sync.m_timeout = time_in_seconds + HEADERS_RESPONSE_TIME;
5131 : : }
5132 : : }
5133 : : }
5134 : 373268 : }
5135 : :
5136 : 191 : void PeerManagerImpl::EvictExtraOutboundPeers(std::chrono::seconds now)
5137 : : {
5138 : : // If we have any extra block-relay-only peers, disconnect the youngest unless
5139 : : // it's given us a block -- in which case, compare with the second-youngest, and
5140 : : // out of those two, disconnect the peer who least recently gave us a block.
5141 : : // The youngest block-relay-only peer would be the extra peer we connected
5142 : : // to temporarily in order to sync our tip; see net.cpp.
5143 : : // Note that we use higher nodeid as a measure for most recent connection.
5144 [ + + ]: 191 : if (m_connman.GetExtraBlockRelayCount() > 0) {
5145 : 3 : std::pair<NodeId, std::chrono::seconds> youngest_peer{-1, 0}, next_youngest_peer{-1, 0};
5146 : :
5147 [ + - ]: 3 : m_connman.ForEachNode([&](CNode* pnode) {
5148 [ + - - + ]: 9 : if (!pnode->IsBlockOnlyConn() || pnode->fDisconnect) return;
5149 [ + - ]: 9 : if (pnode->GetId() > youngest_peer.first) {
5150 : 9 : next_youngest_peer = youngest_peer;
5151 : 9 : youngest_peer.first = pnode->GetId();
5152 : 9 : youngest_peer.second = pnode->m_last_block_time;
5153 : : }
5154 : : });
5155 : 3 : NodeId to_disconnect = youngest_peer.first;
5156 [ + + ]: 3 : if (youngest_peer.second > next_youngest_peer.second) {
5157 : : // Our newest block-relay-only peer gave us a block more recently;
5158 : : // disconnect our second youngest.
5159 : 1 : to_disconnect = next_youngest_peer.first;
5160 : : }
5161 [ + - ]: 6 : m_connman.ForNode(to_disconnect, [&](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
5162 : 3 : AssertLockHeld(::cs_main);
5163 : : // Make sure we're not getting a block right now, and that
5164 : : // we've been connected long enough for this eviction to happen
5165 : : // at all.
5166 : : // Note that we only request blocks from a peer if we learn of a
5167 : : // valid headers chain with at least as much work as our tip.
5168 : 3 : CNodeState *node_state = State(pnode->GetId());
5169 [ + - + + ]: 3 : if (node_state == nullptr ||
5170 [ + + + - ]: 3 : (now - pnode->m_connected >= MINIMUM_CONNECT_TIME && node_state->vBlocksInFlight.empty())) {
5171 : 2 : pnode->fDisconnect = true;
5172 [ + - ]: 2 : LogDebug(BCLog::NET, "disconnecting extra block-relay-only peer=%d (last block received at time %d)\n",
5173 : : pnode->GetId(), count_seconds(pnode->m_last_block_time));
5174 : 2 : return true;
5175 : : } else {
5176 [ + - ]: 1 : LogDebug(BCLog::NET, "keeping block-relay-only peer=%d chosen for eviction (connect time: %d, blocks_in_flight: %d)\n",
5177 : : pnode->GetId(), count_seconds(pnode->m_connected), node_state->vBlocksInFlight.size());
5178 : : }
5179 : : return false;
5180 : : });
5181 : : }
5182 : :
5183 : : // Check whether we have too many outbound-full-relay peers
5184 [ + + ]: 191 : if (m_connman.GetExtraFullOutboundCount() > 0) {
5185 : : // If we have more outbound-full-relay peers than we target, disconnect one.
5186 : : // Pick the outbound-full-relay peer that least recently announced
5187 : : // us a new block, with ties broken by choosing the more recent
5188 : : // connection (higher node id)
5189 : : // Protect peers from eviction if we don't have another connection
5190 : : // to their network, counting both outbound-full-relay and manual peers.
5191 : 4 : NodeId worst_peer = -1;
5192 : 4 : int64_t oldest_block_announcement = std::numeric_limits<int64_t>::max();
5193 : :
5194 [ + - ]: 4 : m_connman.ForEachNode([&](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main, m_connman.GetNodesMutex()) {
5195 : 38 : AssertLockHeld(::cs_main);
5196 : :
5197 : : // Only consider outbound-full-relay peers that are not already
5198 : : // marked for disconnection
5199 [ + - - + ]: 38 : if (!pnode->IsFullOutboundConn() || pnode->fDisconnect) return;
5200 : 38 : CNodeState *state = State(pnode->GetId());
5201 [ + - ]: 38 : if (state == nullptr) return; // shouldn't be possible, but just in case
5202 : : // Don't evict our protected peers
5203 [ + - ]: 38 : if (state->m_chain_sync.m_protect) return;
5204 : : // If this is the only connection on a particular network that is
5205 : : // OUTBOUND_FULL_RELAY or MANUAL, protect it.
5206 [ + + ]: 38 : if (!m_connman.MultipleManualOrFullOutboundConns(pnode->addr.GetNetwork())) return;
5207 [ + + + + : 37 : if (state->m_last_block_announcement < oldest_block_announcement || (state->m_last_block_announcement == oldest_block_announcement && pnode->GetId() > worst_peer)) {
+ - ]
5208 : 34 : worst_peer = pnode->GetId();
5209 : 34 : oldest_block_announcement = state->m_last_block_announcement;
5210 : : }
5211 : : });
5212 [ + - ]: 4 : if (worst_peer != -1) {
5213 [ + - ]: 4 : bool disconnected = m_connman.ForNode(worst_peer, [&](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
5214 : 4 : AssertLockHeld(::cs_main);
5215 : :
5216 : : // Only disconnect a peer that has been connected to us for
5217 : : // some reasonable fraction of our check-frequency, to give
5218 : : // it time for new information to have arrived.
5219 : : // Also don't disconnect any peer we're trying to download a
5220 : : // block from.
5221 : 4 : CNodeState &state = *State(pnode->GetId());
5222 [ + - + - ]: 4 : if (now - pnode->m_connected > MINIMUM_CONNECT_TIME && state.vBlocksInFlight.empty()) {
5223 [ + - ]: 4 : LogDebug(BCLog::NET, "disconnecting extra outbound peer=%d (last block announcement received at time %d)\n", pnode->GetId(), oldest_block_announcement);
5224 : 4 : pnode->fDisconnect = true;
5225 : 4 : return true;
5226 : : } else {
5227 [ # # ]: 0 : LogDebug(BCLog::NET, "keeping outbound peer=%d chosen for eviction (connect time: %d, blocks_in_flight: %d)\n",
5228 : : pnode->GetId(), count_seconds(pnode->m_connected), state.vBlocksInFlight.size());
5229 : 0 : return false;
5230 : : }
5231 : : });
5232 [ + - ]: 4 : if (disconnected) {
5233 : : // If we disconnected an extra peer, that means we successfully
5234 : : // connected to at least one peer after the last time we
5235 : : // detected a stale tip. Don't try any more extra peers until
5236 : : // we next detect a stale tip, to limit the load we put on the
5237 : : // network from these extra connections.
5238 : 4 : m_connman.SetTryNewOutboundPeer(false);
5239 : : }
5240 : : }
5241 : : }
5242 : 191 : }
5243 : :
5244 : 191 : void PeerManagerImpl::CheckForStaleTipAndEvictPeers()
5245 : : {
5246 : 191 : LOCK(cs_main);
5247 : :
5248 : 191 : auto now{GetTime<std::chrono::seconds>()};
5249 : :
5250 [ + - ]: 191 : EvictExtraOutboundPeers(now);
5251 : :
5252 [ + + ]: 191 : if (now > m_stale_tip_check_time) {
5253 : : // Check whether our tip is stale, and if so, allow using an extra
5254 : : // outbound peer
5255 [ + - + - : 65 : if (!m_chainman.m_blockman.LoadingBlocks() && m_connman.GetNetworkActive() && m_connman.GetUseAddrmanOutgoing() && TipMayBeStale()) {
+ + + + ]
5256 [ + - ]: 1 : LogPrintf("Potential stale tip detected, will try using extra outbound peer (last tip update: %d seconds ago)\n",
5257 : : count_seconds(now - m_last_tip_update.load()));
5258 [ + - ]: 1 : m_connman.SetTryNewOutboundPeer(true);
5259 [ + - - + ]: 64 : } else if (m_connman.GetTryNewOutboundPeer()) {
5260 [ # # ]: 0 : m_connman.SetTryNewOutboundPeer(false);
5261 : : }
5262 : 65 : m_stale_tip_check_time = now + STALE_CHECK_INTERVAL;
5263 : : }
5264 : :
5265 [ + + + - : 191 : if (!m_initial_sync_finished && CanDirectFetch()) {
+ + ]
5266 [ + - ]: 51 : m_connman.StartExtraBlockRelayPeers();
5267 : 51 : m_initial_sync_finished = true;
5268 : : }
5269 : 191 : }
5270 : :
5271 : 373275 : void PeerManagerImpl::MaybeSendPing(CNode& node_to, Peer& peer, std::chrono::microseconds now)
5272 : : {
5273 [ + + ]: 373335 : if (m_connman.ShouldRunInactivityChecks(node_to, std::chrono::duration_cast<std::chrono::seconds>(now)) &&
5274 [ + + + + : 373281 : peer.m_ping_nonce_sent &&
+ + ]
5275 [ + + ]: 6 : now > peer.m_ping_start.load() + TIMEOUT_INTERVAL)
5276 : : {
5277 : : // The ping timeout is using mocktime. To disable the check during
5278 : : // testing, increase -peertimeout.
5279 [ + - + - ]: 2 : LogDebug(BCLog::NET, "ping timeout: %fs, %s", 0.000001 * count_microseconds(now - peer.m_ping_start.load()), node_to.DisconnectMsg(fLogIPs));
5280 : 1 : node_to.fDisconnect = true;
5281 : 1 : return;
5282 : : }
5283 : :
5284 : 373274 : bool pingSend = false;
5285 : :
5286 [ + + ]: 373274 : if (peer.m_ping_queued) {
5287 : : // RPC ping request by user
5288 : 5 : pingSend = true;
5289 : : }
5290 : :
5291 [ + + + + ]: 373274 : if (peer.m_ping_nonce_sent == 0 && now > peer.m_ping_start.load() + PING_INTERVAL) {
5292 : : // Ping automatically sent as a latency probe & keepalive.
5293 : : pingSend = true;
5294 : : }
5295 : :
5296 [ + + ]: 373274 : if (pingSend) {
5297 : 2426 : uint64_t nonce;
5298 : 2426 : do {
5299 : 2426 : nonce = FastRandomContext().rand64();
5300 [ - + ]: 2426 : } while (nonce == 0);
5301 : 2426 : peer.m_ping_queued = false;
5302 : 2426 : peer.m_ping_start = now;
5303 [ + - ]: 2426 : if (node_to.GetCommonVersion() > BIP0031_VERSION) {
5304 : 2426 : peer.m_ping_nonce_sent = nonce;
5305 [ + - ]: 4852 : MakeAndPushMessage(node_to, NetMsgType::PING, nonce);
5306 : : } else {
5307 : : // Peer is too old to support ping command with nonce, pong will never arrive.
5308 : 0 : peer.m_ping_nonce_sent = 0;
5309 [ # # ]: 0 : MakeAndPushMessage(node_to, NetMsgType::PING);
5310 : : }
5311 : : }
5312 : : }
5313 : :
5314 : 373274 : void PeerManagerImpl::MaybeSendAddr(CNode& node, Peer& peer, std::chrono::microseconds current_time)
5315 : : {
5316 : : // Nothing to do for non-address-relay peers
5317 [ + + ]: 373274 : if (!peer.m_addr_relay_enabled) return;
5318 : :
5319 : 371430 : LOCK(peer.m_addr_send_times_mutex);
5320 : : // Periodically advertise our local address to the peer.
5321 [ + - + - : 371430 : if (fListen && !m_chainman.IsInitialBlockDownload() &&
+ + + + ]
5322 [ + + ]: 349710 : peer.m_next_local_addr_send < current_time) {
5323 : : // If we've sent before, clear the bloom filter for the peer, so that our
5324 : : // self-announcement will actually go out.
5325 : : // This might be unnecessary if the bloom filter has already rolled
5326 : : // over since our last self-announcement, but there is only a small
5327 : : // bandwidth cost that we can incur by doing this (which happens
5328 : : // once a day on average).
5329 [ + + ]: 1535 : if (peer.m_next_local_addr_send != 0us) {
5330 [ + - ]: 214 : peer.m_addr_known->reset();
5331 : : }
5332 [ + - + + ]: 1535 : if (std::optional<CService> local_service = GetLocalAddrForPeer(node)) {
5333 : 1 : CAddress local_addr{*local_service, peer.m_our_services, Now<NodeSeconds>()};
5334 [ + - ]: 1 : PushAddress(peer, local_addr);
5335 : 1 : }
5336 : 1535 : peer.m_next_local_addr_send = current_time + m_rng.rand_exp_duration(AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL);
5337 : : }
5338 : :
5339 : : // We sent an `addr` message to this peer recently. Nothing more to do.
5340 [ + + ]: 371430 : if (current_time <= peer.m_next_addr_send) return;
5341 : :
5342 [ - + ]: 2879 : peer.m_next_addr_send = current_time + m_rng.rand_exp_duration(AVG_ADDRESS_BROADCAST_INTERVAL);
5343 : :
5344 [ - + ]: 2879 : if (!Assume(peer.m_addrs_to_send.size() <= MAX_ADDR_TO_SEND)) {
5345 : : // Should be impossible since we always check size before adding to
5346 : : // m_addrs_to_send. Recover by trimming the vector.
5347 [ # # ]: 0 : peer.m_addrs_to_send.resize(MAX_ADDR_TO_SEND);
5348 : : }
5349 : :
5350 : : // Remove addr records that the peer already knows about, and add new
5351 : : // addrs to the m_addr_known filter on the same pass.
5352 : 21868 : auto addr_already_known = [&peer](const CAddress& addr) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex) {
5353 [ + - ]: 18989 : bool ret = peer.m_addr_known->contains(addr.GetKey());
5354 [ + - + - ]: 37978 : if (!ret) peer.m_addr_known->insert(addr.GetKey());
5355 : 18989 : return ret;
5356 : 2879 : };
5357 : 2879 : peer.m_addrs_to_send.erase(std::remove_if(peer.m_addrs_to_send.begin(), peer.m_addrs_to_send.end(), addr_already_known),
5358 [ + - ]: 2879 : peer.m_addrs_to_send.end());
5359 : :
5360 : : // No addr messages to send
5361 [ + + ]: 2879 : if (peer.m_addrs_to_send.empty()) return;
5362 : :
5363 [ + + ]: 106 : if (peer.m_wants_addrv2) {
5364 [ + - + - ]: 2 : MakeAndPushMessage(node, NetMsgType::ADDRV2, CAddress::V2_NETWORK(peer.m_addrs_to_send));
5365 : : } else {
5366 [ + - + - ]: 210 : MakeAndPushMessage(node, NetMsgType::ADDR, CAddress::V1_NETWORK(peer.m_addrs_to_send));
5367 : : }
5368 : 106 : peer.m_addrs_to_send.clear();
5369 : :
5370 : : // we only send the big addr message once
5371 [ + + ]: 106 : if (peer.m_addrs_to_send.capacity() > 40) {
5372 : 21 : peer.m_addrs_to_send.shrink_to_fit();
5373 : : }
5374 : 371430 : }
5375 : :
5376 : 373274 : void PeerManagerImpl::MaybeSendSendHeaders(CNode& node, Peer& peer)
5377 : : {
5378 : : // Delay sending SENDHEADERS (BIP 130) until we're done with an
5379 : : // initial-headers-sync with this peer. Receiving headers announcements for
5380 : : // new blocks while trying to sync their headers chain is problematic,
5381 : : // because of the state tracking done.
5382 [ + + + - ]: 373274 : if (!peer.m_sent_sendheaders && node.GetCommonVersion() >= SENDHEADERS_VERSION) {
5383 : 124179 : LOCK(cs_main);
5384 : 124179 : CNodeState &state = *State(node.GetId());
5385 [ + + + + ]: 129405 : if (state.pindexBestKnownBlock != nullptr &&
5386 [ + - + - ]: 5226 : state.pindexBestKnownBlock->nChainWork > m_chainman.MinimumChainWork()) {
5387 : : // Tell our peer we prefer to receive headers rather than inv's
5388 : : // We send this to non-NODE NETWORK peers as well, because even
5389 : : // non-NODE NETWORK peers can announce blocks (such as pruning
5390 : : // nodes)
5391 [ + - + - ]: 783 : MakeAndPushMessage(node, NetMsgType::SENDHEADERS);
5392 : 783 : peer.m_sent_sendheaders = true;
5393 : : }
5394 : 124179 : }
5395 : 373274 : }
5396 : :
5397 : 373268 : void PeerManagerImpl::MaybeSendFeefilter(CNode& pto, Peer& peer, std::chrono::microseconds current_time)
5398 : : {
5399 [ + + ]: 373268 : if (m_opts.ignore_incoming_txs) return;
5400 [ + - ]: 373137 : if (pto.GetCommonVersion() < FEEFILTER_VERSION) return;
5401 : : // peers with the forcerelay permission should not filter txs to us
5402 [ + + ]: 373137 : if (pto.HasPermission(NetPermissionFlags::ForceRelay)) return;
5403 : : // Don't send feefilter messages to outbound block-relay-only peers since they should never announce
5404 : : // transactions to us, regardless of feefilter state.
5405 [ + + ]: 373032 : if (pto.IsBlockOnlyConn()) return;
5406 : :
5407 : 372203 : CAmount currentFilter = m_mempool.GetMinFee().GetFeePerK();
5408 : :
5409 [ + + ]: 372203 : if (m_chainman.IsInitialBlockDownload()) {
5410 : : // Received tx-inv messages are discarded when the active
5411 : : // chainstate is in IBD, so tell the peer to not send them.
5412 : : currentFilter = MAX_MONEY;
5413 : : } else {
5414 [ + + + - : 350281 : static const CAmount MAX_FILTER{m_fee_filter_rounder.round(MAX_MONEY)};
+ - ]
5415 [ + + ]: 350281 : if (peer.m_fee_filter_sent == MAX_FILTER) {
5416 : : // Send the current filter if we sent MAX_FILTER previously
5417 : : // and made it out of IBD.
5418 : 226 : peer.m_next_send_feefilter = 0us;
5419 : : }
5420 : : }
5421 [ + + ]: 372203 : if (current_time > peer.m_next_send_feefilter) {
5422 : 2804 : CAmount filterToSend = m_fee_filter_rounder.round(currentFilter);
5423 : : // We always have a fee filter of at least the min relay fee
5424 [ + + ]: 2804 : filterToSend = std::max(filterToSend, m_mempool.m_opts.min_relay_feerate.GetFeePerK());
5425 [ + + ]: 2804 : if (filterToSend != peer.m_fee_filter_sent) {
5426 [ + - ]: 1649 : MakeAndPushMessage(pto, NetMsgType::FEEFILTER, filterToSend);
5427 : 1649 : peer.m_fee_filter_sent = filterToSend;
5428 : : }
5429 : 2804 : peer.m_next_send_feefilter = current_time + m_rng.rand_exp_duration(AVG_FEEFILTER_BROADCAST_INTERVAL);
5430 : : }
5431 : : // If the fee filter has changed substantially and it's still more than MAX_FEEFILTER_CHANGE_DELAY
5432 : : // until scheduled broadcast, then move the broadcast to within MAX_FEEFILTER_CHANGE_DELAY.
5433 [ + + ]: 369399 : else if (current_time + MAX_FEEFILTER_CHANGE_DELAY < peer.m_next_send_feefilter &&
5434 [ + + + + ]: 2449 : (currentFilter < 3 * peer.m_fee_filter_sent / 4 || currentFilter > 4 * peer.m_fee_filter_sent / 3)) {
5435 : 1673 : peer.m_next_send_feefilter = current_time + m_rng.randrange<std::chrono::microseconds>(MAX_FEEFILTER_CHANGE_DELAY);
5436 : : }
5437 : : }
5438 : :
5439 : : namespace {
5440 : : class CompareInvMempoolOrder
5441 : : {
5442 : : CTxMemPool* mp;
5443 : : bool m_wtxid_relay;
5444 : : public:
5445 : 111859 : explicit CompareInvMempoolOrder(CTxMemPool *_mempool, bool use_wtxid)
5446 : 111859 : {
5447 : 111859 : mp = _mempool;
5448 : 111859 : m_wtxid_relay = use_wtxid;
5449 : : }
5450 : :
5451 : 19222 : bool operator()(std::set<uint256>::iterator a, std::set<uint256>::iterator b)
5452 : : {
5453 : : /* As std::make_heap produces a max-heap, we want the entries with the
5454 : : * fewest ancestors/highest fee to sort later. */
5455 : 19222 : return mp->CompareDepthAndScore(*b, *a, m_wtxid_relay);
5456 : : }
5457 : : };
5458 : : } // namespace
5459 : :
5460 : 23875 : bool PeerManagerImpl::RejectIncomingTxs(const CNode& peer) const
5461 : : {
5462 : : // block-relay-only peers may never send txs to us
5463 [ + + ]: 23875 : if (peer.IsBlockOnlyConn()) return true;
5464 [ + + ]: 23838 : if (peer.IsFeelerConn()) return true;
5465 : : // In -blocksonly mode, peers need the 'relay' permission to send txs to us
5466 [ + + + + ]: 23834 : if (m_opts.ignore_incoming_txs && !peer.HasPermission(NetPermissionFlags::Relay)) return true;
5467 : : return false;
5468 : : }
5469 : :
5470 : 1521 : bool PeerManagerImpl::SetupAddressRelay(const CNode& node, Peer& peer)
5471 : : {
5472 : : // We don't participate in addr relay with outbound block-relay-only
5473 : : // connections to prevent providing adversaries with the additional
5474 : : // information of addr traffic to infer the link.
5475 [ + + ]: 1521 : if (node.IsBlockOnlyConn()) return false;
5476 : :
5477 [ + + ]: 1490 : if (!peer.m_addr_relay_enabled.exchange(true)) {
5478 : : // During version message processing (non-block-relay-only outbound peers)
5479 : : // or on first addr-related message we have received (inbound peers), initialize
5480 : : // m_addr_known.
5481 : 1445 : peer.m_addr_known = std::make_unique<CRollingBloomFilter>(5000, 0.001);
5482 : : }
5483 : :
5484 : : return true;
5485 : : }
5486 : :
5487 : 378369 : bool PeerManagerImpl::SendMessages(CNode* pto)
5488 : : {
5489 : 378369 : AssertLockNotHeld(m_tx_download_mutex);
5490 : 378369 : AssertLockHeld(g_msgproc_mutex);
5491 : :
5492 : 378369 : PeerRef peer = GetPeerRef(pto->GetId());
5493 [ + - ]: 378369 : if (!peer) return false;
5494 : 378369 : const Consensus::Params& consensusParams = m_chainparams.GetConsensus();
5495 : :
5496 : : // We must call MaybeDiscourageAndDisconnect first, to ensure that we'll
5497 : : // disconnect misbehaving peers even before the version handshake is complete.
5498 [ + - + + ]: 378369 : if (MaybeDiscourageAndDisconnect(*pto, *peer)) return true;
5499 : :
5500 : : // Initiate version handshake for outbound connections
5501 [ + + + + ]: 378237 : if (!pto->IsInboundConn() && !peer->m_outbound_version_message_sent) {
5502 [ + - ]: 584 : PushNodeVersion(*pto, *peer);
5503 : 584 : peer->m_outbound_version_message_sent = true;
5504 : : }
5505 : :
5506 : : // Don't send anything until the version handshake is complete
5507 [ + + + + ]: 378237 : if (!pto->fSuccessfullyConnected || pto->fDisconnect)
5508 : 4961 : return true;
5509 : :
5510 : 373276 : const auto current_time{GetTime<std::chrono::microseconds>()};
5511 : :
5512 [ + + + + ]: 373276 : if (pto->IsAddrFetchConn() && current_time - pto->m_connected > 10 * AVG_ADDRESS_BROADCAST_INTERVAL) {
5513 [ + - + - : 2 : LogDebug(BCLog::NET, "addrfetch connection timeout, %s\n", pto->DisconnectMsg(fLogIPs));
+ - + - ]
5514 : 1 : pto->fDisconnect = true;
5515 : 1 : return true;
5516 : : }
5517 : :
5518 [ + - ]: 373275 : MaybeSendPing(*pto, *peer, current_time);
5519 : :
5520 : : // MaybeSendPing may have marked peer for disconnection
5521 [ + + ]: 373275 : if (pto->fDisconnect) return true;
5522 : :
5523 [ + - ]: 373274 : MaybeSendAddr(*pto, *peer, current_time);
5524 : :
5525 [ + - ]: 373274 : MaybeSendSendHeaders(*pto, *peer);
5526 : :
5527 : 373274 : {
5528 [ + - ]: 373274 : LOCK(cs_main);
5529 : :
5530 : 373274 : CNodeState &state = *State(pto->GetId());
5531 : :
5532 : : // Start block sync
5533 [ - + ]: 373274 : if (m_chainman.m_best_header == nullptr) {
5534 [ # # # # ]: 0 : m_chainman.m_best_header = m_chainman.ActiveChain().Tip();
5535 : : }
5536 : :
5537 : : // Determine whether we might try initial headers sync or parallel
5538 : : // block download from this peer -- this mostly affects behavior while
5539 : : // in IBD (once out of IBD, we sync from all peers).
5540 : 373274 : bool sync_blocks_and_headers_from_peer = false;
5541 [ + + ]: 373274 : if (state.fPreferredDownload) {
5542 : : sync_blocks_and_headers_from_peer = true;
5543 [ + + + + ]: 137707 : } else if (CanServeBlocks(*peer) && !pto->IsAddrFetchConn()) {
5544 : : // Typically this is an inbound peer. If we don't have any outbound
5545 : : // peers, or if we aren't downloading any blocks from such peers,
5546 : : // then allow block downloads from this peer, too.
5547 : : // We prefer downloading blocks from outbound peers to avoid
5548 : : // putting undue load on (say) some home user who is just making
5549 : : // outbound connections to the network, but if our only source of
5550 : : // the latest blocks is from an inbound peer, we have to be sure to
5551 : : // eventually download it (and not just wait indefinitely for an
5552 : : // outbound peer to have it).
5553 [ + + + + ]: 136218 : if (m_num_preferred_download_peers == 0 || mapBlocksInFlight.empty()) {
5554 : : sync_blocks_and_headers_from_peer = true;
5555 : : }
5556 : : }
5557 : :
5558 [ + + + + : 373274 : if (!state.fSyncStarted && CanServeBlocks(*peer) && !m_chainman.m_blockman.LoadingBlocks()) {
+ - ]
5559 : : // Only actively request headers from a single peer, unless we're close to today.
5560 [ + + + + : 6042 : if ((nSyncStarted == 0 && sync_blocks_and_headers_from_peer) || m_chainman.m_best_header->Time() > NodeClock::now() - 24h) {
+ + ]
5561 : 1442 : const CBlockIndex* pindexStart = m_chainman.m_best_header;
5562 : : /* If possible, start at the block preceding the currently
5563 : : best known header. This ensures that we always get a
5564 : : non-empty list of headers back as long as the peer
5565 : : is up-to-date. With a non-empty response, we can initialise
5566 : : the peer's known best block. This wouldn't be possible
5567 : : if we requested starting at m_chainman.m_best_header and
5568 : : got back an empty response. */
5569 [ + + ]: 1442 : if (pindexStart->pprev)
5570 : 1214 : pindexStart = pindexStart->pprev;
5571 [ + - + - : 1442 : if (MaybeSendGetHeaders(*pto, GetLocator(pindexStart), *peer)) {
+ + ]
5572 [ + - + - : 1441 : LogDebug(BCLog::NET, "initial getheaders (%d) to peer=%d (startheight:%d)\n", pindexStart->nHeight, pto->GetId(), peer->m_starting_height);
+ - ]
5573 : :
5574 : 1441 : state.fSyncStarted = true;
5575 : 1441 : peer->m_headers_sync_timeout = current_time + HEADERS_DOWNLOAD_TIMEOUT_BASE +
5576 : : (
5577 : : // Convert HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER to microseconds before scaling
5578 : : // to maintain precision
5579 : 1441 : std::chrono::microseconds{HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER} *
5580 : 1441 : Ticks<std::chrono::seconds>(NodeClock::now() - m_chainman.m_best_header->Time()) / consensusParams.nPowTargetSpacing
5581 : 1441 : );
5582 : 1441 : nSyncStarted++;
5583 : : }
5584 : : }
5585 : : }
5586 : :
5587 : : //
5588 : : // Try sending block announcements via headers
5589 : : //
5590 : 373274 : {
5591 : : // If we have no more than MAX_BLOCKS_TO_ANNOUNCE in our
5592 : : // list of block hashes we're relaying, and our peer wants
5593 : : // headers announcements, then find the first header
5594 : : // not yet known to our peer but would connect, and send.
5595 : : // If no header would connect, or if we have too many
5596 : : // blocks, or if the peer doesn't want headers, just
5597 : : // add all to the inv queue.
5598 [ + - ]: 373274 : LOCK(peer->m_block_inv_mutex);
5599 : 373274 : std::vector<CBlock> vHeaders;
5600 [ + + ]: 373274 : bool fRevertToInv = ((!peer->m_prefers_headers &&
5601 [ + + + + : 373274 : (!state.m_requested_hb_cmpctblocks || peer->m_blocks_for_headers_relay.size() > 1)) ||
+ - + + ]
5602 [ + + ]: 234580 : peer->m_blocks_for_headers_relay.size() > MAX_BLOCKS_TO_ANNOUNCE);
5603 : 373274 : const CBlockIndex *pBestIndex = nullptr; // last header queued for delivery
5604 [ + - ]: 373274 : ProcessBlockAvailability(pto->GetId()); // ensure pindexBestKnownBlock is up-to-date
5605 : :
5606 [ + + ]: 373274 : if (!fRevertToInv) {
5607 : 234426 : bool fFoundStartingHeader = false;
5608 : : // Try to find first header that our peer doesn't have, and
5609 : : // then send all headers past that one. If we come across any
5610 : : // headers that aren't on m_chainman.ActiveChain(), give up.
5611 [ + + ]: 283853 : for (const uint256& hash : peer->m_blocks_for_headers_relay) {
5612 [ + - ]: 49791 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(hash);
5613 [ - + ]: 49791 : assert(pindex);
5614 [ + - + - : 99582 : if (m_chainman.ActiveChain()[pindex->nHeight] != pindex) {
+ - ]
5615 : : // Bail out if we reorged away from this block
5616 : : fRevertToInv = true;
5617 : : break;
5618 : : }
5619 [ + + + - ]: 49791 : if (pBestIndex != nullptr && pindex->pprev != pBestIndex) {
5620 : : // This means that the list of blocks to announce don't
5621 : : // connect to each other.
5622 : : // This shouldn't really be possible to hit during
5623 : : // regular operation (because reorgs should take us to
5624 : : // a chain that has some block not on the prior chain,
5625 : : // which should be caught by the prior check), but one
5626 : : // way this could happen is by using invalidateblock /
5627 : : // reconsiderblock repeatedly on the tip, causing it to
5628 : : // be added multiple times to m_blocks_for_headers_relay.
5629 : : // Robustly deal with this rare situation by reverting
5630 : : // to an inv.
5631 : : fRevertToInv = true;
5632 : : break;
5633 : : }
5634 : 49791 : pBestIndex = pindex;
5635 [ + + ]: 49791 : if (fFoundStartingHeader) {
5636 : : // add this to the headers message
5637 [ + - ]: 1925 : vHeaders.emplace_back(pindex->GetBlockHeader());
5638 [ + - + + ]: 47866 : } else if (PeerHasHeader(&state, pindex)) {
5639 : 41640 : continue; // keep looking for the first new block
5640 [ + - + - : 6226 : } else if (pindex->pprev == nullptr || PeerHasHeader(&state, pindex->pprev)) {
+ + ]
5641 : : // Peer doesn't have this header but they do have the prior one.
5642 : : // Start sending headers.
5643 : 5862 : fFoundStartingHeader = true;
5644 [ + - ]: 5862 : vHeaders.emplace_back(pindex->GetBlockHeader());
5645 : : } else {
5646 : : // Peer doesn't have this header or the prior one -- nothing will
5647 : : // connect, so bail out.
5648 : : fRevertToInv = true;
5649 : : break;
5650 : : }
5651 : : }
5652 : : }
5653 [ + + + + ]: 234426 : if (!fRevertToInv && !vHeaders.empty()) {
5654 [ + + + + ]: 5862 : if (vHeaders.size() == 1 && state.m_requested_hb_cmpctblocks) {
5655 : : // We only send up to 1 block as header-and-ids, as otherwise
5656 : : // probably means we're doing an initial-ish-sync or they're slow
5657 [ + - + - : 4838 : LogDebug(BCLog::NET, "%s sending header-and-ids %s to peer=%d\n", __func__,
+ - + - +
- ]
5658 : : vHeaders.front().GetHash().ToString(), pto->GetId());
5659 : :
5660 : 2419 : std::optional<CSerializedNetMsg> cached_cmpctblock_msg;
5661 : 2419 : {
5662 [ + - ]: 2419 : LOCK(m_most_recent_block_mutex);
5663 [ + + ]: 2419 : if (m_most_recent_block_hash == pBestIndex->GetBlockHash()) {
5664 [ + - + - ]: 116 : cached_cmpctblock_msg = NetMsg::Make(NetMsgType::CMPCTBLOCK, *m_most_recent_compact_block);
5665 : : }
5666 : 0 : }
5667 [ + + ]: 2419 : if (cached_cmpctblock_msg.has_value()) {
5668 [ + - ]: 58 : PushMessage(*pto, std::move(cached_cmpctblock_msg.value()));
5669 : : } else {
5670 : 2361 : CBlock block;
5671 [ + - ]: 2361 : const bool ret{m_chainman.m_blockman.ReadBlock(block, *pBestIndex)};
5672 [ - + ]: 2361 : assert(ret);
5673 [ + - ]: 2361 : CBlockHeaderAndShortTxIDs cmpctblock{block, m_rng.rand64()};
5674 [ + - + - ]: 4722 : MakeAndPushMessage(*pto, NetMsgType::CMPCTBLOCK, cmpctblock);
5675 : 2361 : }
5676 [ + + ]: 2419 : state.pindexBestHeaderSent = pBestIndex;
5677 [ + - ]: 5862 : } else if (peer->m_prefers_headers) {
5678 [ + + ]: 3443 : if (vHeaders.size() > 1) {
5679 [ + - + - : 2348 : LogDebug(BCLog::NET, "%s: %u headers, range (%s, %s), to peer=%d\n", __func__,
+ - + - +
- + - +
- ]
5680 : : vHeaders.size(),
5681 : : vHeaders.front().GetHash().ToString(),
5682 : : vHeaders.back().GetHash().ToString(), pto->GetId());
5683 : : } else {
5684 [ + - + - : 4538 : LogDebug(BCLog::NET, "%s: sending header %s to peer=%d\n", __func__,
+ - + - +
- ]
5685 : : vHeaders.front().GetHash().ToString(), pto->GetId());
5686 : : }
5687 [ + - + - ]: 3443 : MakeAndPushMessage(*pto, NetMsgType::HEADERS, TX_WITH_WITNESS(vHeaders));
5688 : 3443 : state.pindexBestHeaderSent = pBestIndex;
5689 : : } else
5690 : : fRevertToInv = true;
5691 : : }
5692 [ + + ]: 373274 : if (fRevertToInv) {
5693 : : // If falling back to using an inv, just try to inv the tip.
5694 : : // The last entry in m_blocks_for_headers_relay was our tip at some point
5695 : : // in the past.
5696 [ + + ]: 139212 : if (!peer->m_blocks_for_headers_relay.empty()) {
5697 [ + - ]: 24757 : const uint256& hashToAnnounce = peer->m_blocks_for_headers_relay.back();
5698 [ + - ]: 24757 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(hashToAnnounce);
5699 [ - + ]: 24757 : assert(pindex);
5700 : :
5701 : : // Warn if we're announcing a block that is not on the main chain.
5702 : : // This should be very rare and could be optimized out.
5703 : : // Just log for now.
5704 [ + - + - : 49514 : if (m_chainman.ActiveChain()[pindex->nHeight] != pindex) {
- + ]
5705 [ # # # # : 0 : LogDebug(BCLog::NET, "Announcing block %s not on main chain (tip=%s)\n",
# # # # #
# # # #
# ]
5706 : : hashToAnnounce.ToString(), m_chainman.ActiveChain().Tip()->GetBlockHash().ToString());
5707 : : }
5708 : :
5709 : : // If the peer's chain has this block, don't inv it back.
5710 [ + - + + ]: 24757 : if (!PeerHasHeader(&state, pindex)) {
5711 [ + - ]: 7754 : peer->m_blocks_for_inv_relay.push_back(hashToAnnounce);
5712 [ + - + - : 15508 : LogDebug(BCLog::NET, "%s: sending inv peer=%d hash=%s\n", __func__,
+ - + - ]
5713 : : pto->GetId(), hashToAnnounce.ToString());
5714 : : }
5715 : : }
5716 : : }
5717 [ + + ]: 373274 : peer->m_blocks_for_headers_relay.clear();
5718 [ + - ]: 373274 : }
5719 : :
5720 : : //
5721 : : // Message: inventory
5722 : : //
5723 : 373274 : std::vector<CInv> vInv;
5724 : 373274 : {
5725 [ + - ]: 373274 : LOCK(peer->m_block_inv_mutex);
5726 [ - + + - ]: 373274 : vInv.reserve(std::max<size_t>(peer->m_blocks_for_inv_relay.size(), INVENTORY_BROADCAST_TARGET));
5727 : :
5728 : : // Add blocks
5729 [ + + ]: 381047 : for (const uint256& hash : peer->m_blocks_for_inv_relay) {
5730 [ + - ]: 7773 : vInv.emplace_back(MSG_BLOCK, hash);
5731 [ - + ]: 7773 : if (vInv.size() == MAX_INV_SZ) {
5732 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::INV, vInv);
5733 [ - - ]: 7773 : vInv.clear();
5734 : : }
5735 : : }
5736 [ + + + - ]: 381031 : peer->m_blocks_for_inv_relay.clear();
5737 : 0 : }
5738 : :
5739 [ + - + + ]: 373274 : if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
5740 [ + - ]: 372441 : LOCK(tx_relay->m_tx_inventory_mutex);
5741 : : // Check whether periodic sends should happen
5742 [ + + ]: 372441 : bool fSendTrickle = pto->HasPermission(NetPermissionFlags::NoBan);
5743 [ + + ]: 372441 : if (tx_relay->m_next_inv_send_time < current_time) {
5744 : 6899 : fSendTrickle = true;
5745 [ + + ]: 6899 : if (pto->IsInboundConn()) {
5746 : 3351 : tx_relay->m_next_inv_send_time = NextInvToInbounds(current_time, INBOUND_INVENTORY_BROADCAST_INTERVAL);
5747 : : } else {
5748 : 3548 : tx_relay->m_next_inv_send_time = current_time + m_rng.rand_exp_duration(OUTBOUND_INVENTORY_BROADCAST_INTERVAL);
5749 : : }
5750 : : }
5751 : :
5752 : : // Time to send but the peer has requested we not relay transactions.
5753 [ + + ]: 372441 : if (fSendTrickle) {
5754 [ + - ]: 111859 : LOCK(tx_relay->m_bloom_filter_mutex);
5755 [ + + ]: 111859 : if (!tx_relay->m_relay_txs) tx_relay->m_tx_inventory_to_send.clear();
5756 : 111859 : }
5757 : :
5758 : : // Respond to BIP35 mempool requests
5759 [ + - + + ]: 111859 : if (fSendTrickle && tx_relay->m_send_mempool) {
5760 [ + - ]: 2 : auto vtxinfo = m_mempool.infoAll();
5761 : 2 : tx_relay->m_send_mempool = false;
5762 [ + - ]: 2 : const CFeeRate filterrate{tx_relay->m_fee_filter_received.load()};
5763 : :
5764 [ + - ]: 2 : LOCK(tx_relay->m_bloom_filter_mutex);
5765 : :
5766 [ + + ]: 4 : for (const auto& txinfo : vtxinfo) {
5767 [ - + ]: 2 : CInv inv{
5768 [ - + ]: 2 : peer->m_wtxid_relay ? MSG_WTX : MSG_TX,
5769 [ + - ]: 2 : peer->m_wtxid_relay ?
5770 : 2 : txinfo.tx->GetWitnessHash().ToUint256() :
5771 : 0 : txinfo.tx->GetHash().ToUint256(),
5772 [ - + + - : 4 : };
+ - ]
5773 : 2 : tx_relay->m_tx_inventory_to_send.erase(inv.hash);
5774 : :
5775 : : // Don't send transactions that peers will not put into their mempool
5776 [ + - - + ]: 2 : if (txinfo.fee < filterrate.GetFee(txinfo.vsize)) {
5777 : 0 : continue;
5778 : : }
5779 [ + - ]: 2 : if (tx_relay->m_bloom_filter) {
5780 [ + - + + ]: 2 : if (!tx_relay->m_bloom_filter->IsRelevantAndUpdate(*txinfo.tx)) continue;
5781 : : }
5782 [ + - ]: 1 : tx_relay->m_tx_inventory_known_filter.insert(inv.hash);
5783 [ + - ]: 1 : vInv.push_back(inv);
5784 [ - + ]: 1 : if (vInv.size() == MAX_INV_SZ) {
5785 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::INV, vInv);
5786 [ - - ]: 2 : vInv.clear();
5787 : : }
5788 : : }
5789 : 2 : }
5790 : :
5791 : : // Determine transactions to relay
5792 : 111859 : if (fSendTrickle) {
5793 : : // Produce a vector with all candidates for sending
5794 : 111859 : std::vector<std::set<uint256>::iterator> vInvTx;
5795 [ + - ]: 111859 : vInvTx.reserve(tx_relay->m_tx_inventory_to_send.size());
5796 [ + + ]: 131094 : for (std::set<uint256>::iterator it = tx_relay->m_tx_inventory_to_send.begin(); it != tx_relay->m_tx_inventory_to_send.end(); it++) {
5797 [ + - ]: 19235 : vInvTx.push_back(it);
5798 : : }
5799 [ + - ]: 111859 : const CFeeRate filterrate{tx_relay->m_fee_filter_received.load()};
5800 : : // Topologically and fee-rate sort the inventory we send for privacy and priority reasons.
5801 : : // A heap is used so that not all items need sorting if only a few are being sent.
5802 [ + - ]: 111859 : CompareInvMempoolOrder compareInvMempoolOrder(&m_mempool, peer->m_wtxid_relay);
5803 [ + - ]: 111859 : std::make_heap(vInvTx.begin(), vInvTx.end(), compareInvMempoolOrder);
5804 : : // No reason to drain out at many times the network's capacity,
5805 : : // especially since we have many peers and some will draw much shorter delays.
5806 : 111859 : unsigned int nRelayedTransactions = 0;
5807 [ + - ]: 111859 : LOCK(tx_relay->m_bloom_filter_mutex);
5808 [ - + ]: 111859 : size_t broadcast_max{INVENTORY_BROADCAST_TARGET + (tx_relay->m_tx_inventory_to_send.size()/1000)*5};
5809 [ - + ]: 111859 : broadcast_max = std::min<size_t>(INVENTORY_BROADCAST_MAX, broadcast_max);
5810 [ + + + + ]: 131055 : while (!vInvTx.empty() && nRelayedTransactions < broadcast_max) {
5811 : : // Fetch the top element from the heap
5812 [ + - ]: 19196 : std::pop_heap(vInvTx.begin(), vInvTx.end(), compareInvMempoolOrder);
5813 : 19196 : std::set<uint256>::iterator it = vInvTx.back();
5814 [ + + ]: 19196 : vInvTx.pop_back();
5815 [ + + ]: 19196 : uint256 hash = *it;
5816 [ + + + - ]: 19254 : CInv inv(peer->m_wtxid_relay ? MSG_WTX : MSG_TX, hash);
5817 : : // Remove it from the to-be-sent set
5818 : 19196 : tx_relay->m_tx_inventory_to_send.erase(it);
5819 : : // Check if not in the filter already
5820 [ + - + + ]: 19196 : if (tx_relay->m_tx_inventory_known_filter.contains(hash)) {
5821 : 1654 : continue;
5822 : : }
5823 : : // Not in the mempool anymore? don't bother sending it.
5824 [ + - + - ]: 17542 : auto txinfo = m_mempool.info(ToGenTxid(inv));
5825 [ + + ]: 17542 : if (!txinfo.tx) {
5826 : 1093 : continue;
5827 : : }
5828 : : // Peer told you to not send transactions at that feerate? Don't bother sending it.
5829 [ + - + + ]: 16449 : if (txinfo.fee < filterrate.GetFee(txinfo.vsize)) {
5830 : 8 : continue;
5831 : : }
5832 [ + + + - : 16441 : if (tx_relay->m_bloom_filter && !tx_relay->m_bloom_filter->IsRelevantAndUpdate(*txinfo.tx)) continue;
+ + ]
5833 : : // Send
5834 [ + - ]: 16439 : vInv.push_back(inv);
5835 : 16439 : nRelayedTransactions++;
5836 [ - + ]: 16439 : if (vInv.size() == MAX_INV_SZ) {
5837 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::INV, vInv);
5838 [ # # ]: 0 : vInv.clear();
5839 : : }
5840 [ + - ]: 16439 : tx_relay->m_tx_inventory_known_filter.insert(hash);
5841 : 17542 : }
5842 : :
5843 : : // Ensure we'll respond to GETDATA requests for anything we've just announced
5844 [ + - ]: 111859 : LOCK(m_mempool.cs);
5845 [ + - ]: 111859 : tx_relay->m_last_inv_sequence = m_mempool.GetSequence();
5846 [ + - ]: 223718 : }
5847 : 372441 : }
5848 [ + + ]: 373274 : if (!vInv.empty())
5849 [ + - + - ]: 34888 : MakeAndPushMessage(*pto, NetMsgType::INV, vInv);
5850 : :
5851 : : // Detect whether we're stalling
5852 [ + + ]: 373274 : auto stalling_timeout = m_block_stalling_timeout.load();
5853 [ + + + + ]: 373274 : if (state.m_stalling_since.count() && state.m_stalling_since < current_time - stalling_timeout) {
5854 : : // Stalling only triggers when the block download window cannot move. During normal steady state,
5855 : : // the download window should be much larger than the to-be-downloaded set of blocks, so disconnection
5856 : : // should only happen during initial block download.
5857 [ + - + - ]: 6 : LogInfo("Peer is stalling block download, %s\n", pto->DisconnectMsg(fLogIPs));
5858 [ + - ]: 6 : pto->fDisconnect = true;
5859 : : // Increase timeout for the next peer so that we don't disconnect multiple peers if our own
5860 : : // bandwidth is insufficient.
5861 [ + - ]: 6 : const auto new_timeout = std::min(2 * stalling_timeout, BLOCK_STALLING_TIMEOUT_MAX);
5862 [ + - + - ]: 6 : if (stalling_timeout != new_timeout && m_block_stalling_timeout.compare_exchange_strong(stalling_timeout, new_timeout)) {
5863 [ + - + - : 6 : LogDebug(BCLog::NET, "Increased stalling timeout temporarily to %d seconds\n", count_seconds(new_timeout));
+ - ]
5864 : : }
5865 : 6 : return true;
5866 : : }
5867 : : // In case there is a block that has been in flight from this peer for block_interval * (1 + 0.5 * N)
5868 : : // (with N the number of peers from which we're downloading validated blocks), disconnect due to timeout.
5869 : : // We compensate for other peers to prevent killing off peers due to our own downstream link
5870 : : // being saturated. We only count validated in-flight blocks so peers can't advertise non-existing block hashes
5871 : : // to unreasonably increase our timeout.
5872 [ + + ]: 373268 : if (state.vBlocksInFlight.size() > 0) {
5873 : 47038 : QueuedBlock &queuedBlock = state.vBlocksInFlight.front();
5874 : 47038 : int nOtherPeersWithValidatedDownloads = m_peers_downloading_from - 1;
5875 [ - + ]: 47038 : if (current_time > state.m_downloading_since + std::chrono::seconds{consensusParams.nPowTargetSpacing} * (BLOCK_DOWNLOAD_TIMEOUT_BASE + BLOCK_DOWNLOAD_TIMEOUT_PER_PEER * nOtherPeersWithValidatedDownloads)) {
5876 [ # # # # : 0 : LogInfo("Timeout downloading block %s, %s\n", queuedBlock.pindex->GetBlockHash().ToString(), pto->DisconnectMsg(fLogIPs));
# # ]
5877 : 0 : pto->fDisconnect = true;
5878 : 0 : return true;
5879 : : }
5880 : : }
5881 : : // Check for headers sync timeouts
5882 [ + + + + ]: 373268 : if (state.fSyncStarted && peer->m_headers_sync_timeout < std::chrono::microseconds::max()) {
5883 : : // Detect whether this is a stalling initial-headers-sync peer
5884 [ + + ]: 12881 : if (m_chainman.m_best_header->Time() <= NodeClock::now() - 24h) {
5885 [ + + + - : 11541 : if (current_time > peer->m_headers_sync_timeout && nSyncStarted == 1 && (m_num_preferred_download_peers - state.fPreferredDownload >= 1)) {
- + ]
5886 : : // Disconnect a peer (without NetPermissionFlags::NoBan permission) if it is our only sync peer,
5887 : : // and we have others we could be using instead.
5888 : : // Note: If all our peers are inbound, then we won't
5889 : : // disconnect our sync peer for stalling; we have bigger
5890 : : // problems if we can't get any outbound peers.
5891 [ # # ]: 0 : if (!pto->HasPermission(NetPermissionFlags::NoBan)) {
5892 [ # # # # ]: 0 : LogInfo("Timeout downloading headers, %s\n", pto->DisconnectMsg(fLogIPs));
5893 : 0 : pto->fDisconnect = true;
5894 : 0 : return true;
5895 : : } else {
5896 [ # # # # ]: 0 : LogInfo("Timeout downloading headers from noban peer, not %s\n", pto->DisconnectMsg(fLogIPs));
5897 : : // Reset the headers sync state so that we have a
5898 : : // chance to try downloading from a different peer.
5899 : : // Note: this will also result in at least one more
5900 : : // getheaders message to be sent to
5901 : : // this peer (eventually).
5902 : 0 : state.fSyncStarted = false;
5903 : 0 : nSyncStarted--;
5904 : 0 : peer->m_headers_sync_timeout = 0us;
5905 : : }
5906 : : }
5907 : : } else {
5908 : : // After we've caught up once, reset the timeout so we can't trigger
5909 : : // disconnect later.
5910 : 1340 : peer->m_headers_sync_timeout = std::chrono::microseconds::max();
5911 : : }
5912 : : }
5913 : :
5914 : : // Check that outbound peers have reasonable chains
5915 : : // GetTime() is used by this anti-DoS logic so we can test this using mocktime
5916 [ + - ]: 373268 : ConsiderEviction(*pto, *peer, GetTime<std::chrono::seconds>());
5917 : :
5918 : : //
5919 : : // Message: getdata (blocks)
5920 : : //
5921 : 373268 : std::vector<CInv> vGetData;
5922 [ + + + + : 373268 : if (CanServeBlocks(*peer) && ((sync_blocks_and_headers_from_peer && !IsLimitedPeer(*peer)) || !m_chainman.IsInitialBlockDownload()) && state.vBlocksInFlight.size() < MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
+ + + - +
+ + + ]
5923 : 365239 : std::vector<const CBlockIndex*> vToDownload;
5924 : 365239 : NodeId staller = -1;
5925 : 366731 : auto get_inflight_budget = [&state]() {
5926 : 733462 : return std::max(0, MAX_BLOCKS_IN_TRANSIT_PER_PEER - static_cast<int>(state.vBlocksInFlight.size()));
5927 : 365239 : };
5928 : :
5929 : : // If a snapshot chainstate is in use, we want to find its next blocks
5930 : : // before the background chainstate to prioritize getting to network tip.
5931 [ - + + - ]: 365239 : FindNextBlocksToDownload(*peer, get_inflight_budget(), vToDownload, staller);
5932 [ + + + - ]: 365239 : if (m_chainman.BackgroundSyncInProgress() && !IsLimitedPeer(*peer)) {
5933 : : // If the background tip is not an ancestor of the snapshot block,
5934 : : // we need to start requesting blocks from their last common ancestor.
5935 [ + - + - ]: 1492 : const CBlockIndex *from_tip = LastCommonAncestor(m_chainman.GetBackgroundSyncTip(), m_chainman.GetSnapshotBaseBlock());
5936 [ - + ]: 1492 : TryDownloadingHistoricalBlocks(
5937 [ + - ]: 1492 : *peer,
5938 [ + - ]: 1492 : get_inflight_budget(),
5939 : : vToDownload, from_tip,
5940 [ + - + - ]: 1492 : Assert(m_chainman.GetSnapshotBaseBlock()));
5941 : : }
5942 [ + + ]: 403140 : for (const CBlockIndex *pindex : vToDownload) {
5943 : 37901 : uint32_t nFetchFlags = GetFetchFlags(*peer);
5944 [ + - ]: 37901 : vGetData.emplace_back(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash());
5945 [ + - ]: 37901 : BlockRequested(pto->GetId(), *pindex);
5946 [ + - + - : 75802 : LogDebug(BCLog::NET, "Requesting block %s (%d) peer=%d\n", pindex->GetBlockHash().ToString(),
+ - + - ]
5947 : : pindex->nHeight, pto->GetId());
5948 : : }
5949 [ + + + + ]: 365239 : if (state.vBlocksInFlight.empty() && staller != -1) {
5950 [ + + ]: 135 : if (State(staller)->m_stalling_since == 0us) {
5951 : 6 : State(staller)->m_stalling_since = current_time;
5952 [ + - + - : 6 : LogDebug(BCLog::NET, "Stall started peer=%d\n", staller);
+ - ]
5953 : : }
5954 : : }
5955 : 365239 : }
5956 : :
5957 : : //
5958 : : // Message: getdata (transactions)
5959 : : //
5960 : 373268 : {
5961 [ + - ]: 373268 : LOCK(m_tx_download_mutex);
5962 [ + - + + ]: 394581 : for (const GenTxid& gtxid : m_txdownloadman.GetRequestsToSend(pto->GetId(), current_time)) {
5963 [ + + + - ]: 21313 : vGetData.emplace_back(gtxid.IsWtxid() ? MSG_WTX : (MSG_TX | GetFetchFlags(*peer)), gtxid.GetHash());
5964 [ + + ]: 21313 : if (vGetData.size() >= MAX_GETDATA_SZ) {
5965 [ + - + - ]: 10 : MakeAndPushMessage(*pto, NetMsgType::GETDATA, vGetData);
5966 [ + - ]: 21323 : vGetData.clear();
5967 : : }
5968 [ + - ]: 373268 : }
5969 : 0 : }
5970 : :
5971 [ + + ]: 373268 : if (!vGetData.empty())
5972 [ + - + - ]: 84730 : MakeAndPushMessage(*pto, NetMsgType::GETDATA, vGetData);
5973 [ + - + - ]: 373280 : } // release cs_main
5974 [ + - ]: 373268 : MaybeSendFeefilter(*pto, *peer, current_time);
5975 : : return true;
5976 : 378369 : }
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