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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/txorphanage.h>
39 : : #include <node/txreconciliation.h>
40 : : #include <node/warnings.h>
41 : : #include <policy/feerate.h>
42 : : #include <policy/fees.h>
43 : : #include <policy/packages.h>
44 : : #include <policy/policy.h>
45 : : #include <primitives/block.h>
46 : : #include <primitives/transaction.h>
47 : : #include <protocol.h>
48 : : #include <random.h>
49 : : #include <scheduler.h>
50 : : #include <script/script.h>
51 : : #include <serialize.h>
52 : : #include <span.h>
53 : : #include <streams.h>
54 : : #include <sync.h>
55 : : #include <tinyformat.h>
56 : : #include <txmempool.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 : 206 : 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 wtxids we still have to announce. For non-wtxid-relay peers,
302 : : * we retrieve the txid from the corresponding mempool transaction when
303 : : * constructing the `inv` message. We use the mempool to sort transactions
304 : : * in dependency order before relay, so this does not have to be sorted. */
305 : : std::set<Wtxid> 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 : 6128 : TxRelay* SetTxRelay() EXCLUSIVE_LOCKS_REQUIRED(!m_tx_relay_mutex)
323 : : {
324 : 6128 : LOCK(m_tx_relay_mutex);
325 [ + - ]: 6128 : Assume(!m_tx_relay);
326 [ + - ]: 6128 : m_tx_relay = std::make_unique<Peer::TxRelay>();
327 [ + - ]: 6128 : return m_tx_relay.get();
328 : 6128 : };
329 : :
330 : 774203 : TxRelay* GetTxRelay() EXCLUSIVE_LOCKS_REQUIRED(!m_tx_relay_mutex)
331 : : {
332 [ + - + - : 820648 : 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 : 9935 : explicit Peer(NodeId id, ServiceFlags our_services, bool is_inbound)
416 : 9935 : : m_id{id}
417 : 9935 : , m_our_services{our_services}
418 [ + - ]: 9935 : , m_is_inbound{is_inbound}
419 : 9935 : {}
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 : 9935 : 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 std::shared_ptr<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<node::TxOrphanage::OrphanInfo> 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 Txid& txid, const Wtxid& wtxid) override EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
540 : 0 : void SetBestBlock(int height, std::chrono::seconds time) override
541 : : {
542 : 0 : m_best_height = height;
543 : 0 : m_best_block_time = time;
544 : 0 : };
545 [ # # # # : 0 : 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 : 0 : bool via_compact_block, const std::string& message = "")
584 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex);
585 : :
586 : : /** Maybe disconnect a peer and discourage future connections from its address.
587 : : *
588 : : * @param[in] pnode The node to check.
589 : : * @param[in] peer The peer object to check.
590 : : * @return True if the peer was marked for disconnection in this function
591 : : */
592 : : bool MaybeDiscourageAndDisconnect(CNode& pnode, Peer& peer);
593 : :
594 : : /** Handle a transaction whose result was not MempoolAcceptResult::ResultType::VALID.
595 : : * @param[in] first_time_failure Whether we should consider inserting into vExtraTxnForCompact, adding
596 : : * a new orphan to resolve, or looking for a package to submit.
597 : : * Set to true for transactions just received over p2p.
598 : : * Set to false if the tx has already been rejected before,
599 : : * e.g. is already in the orphanage, to avoid adding duplicate entries.
600 : : * Updates m_txrequest, m_lazy_recent_rejects, m_lazy_recent_rejects_reconsiderable, m_orphanage, and vExtraTxnForCompact.
601 : : *
602 : : * @returns a PackageToValidate if this transaction has a reconsiderable failure and an eligible package was found,
603 : : * or std::nullopt otherwise.
604 : : */
605 : : std::optional<node::PackageToValidate> ProcessInvalidTx(NodeId nodeid, const CTransactionRef& tx, const TxValidationState& result,
606 : : bool first_time_failure)
607 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex, m_tx_download_mutex);
608 : :
609 : : /** Handle a transaction whose result was MempoolAcceptResult::ResultType::VALID.
610 : : * Updates m_txrequest, m_orphanage, and vExtraTxnForCompact. Also queues the tx for relay. */
611 : : void ProcessValidTx(NodeId nodeid, const CTransactionRef& tx, const std::list<CTransactionRef>& replaced_transactions)
612 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex, m_tx_download_mutex);
613 : :
614 : : /** Handle the results of package validation: calls ProcessValidTx and ProcessInvalidTx for
615 : : * individual transactions, and caches rejection for the package as a group.
616 : : */
617 : : void ProcessPackageResult(const node::PackageToValidate& package_to_validate, const PackageMempoolAcceptResult& package_result)
618 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex, m_tx_download_mutex);
619 : :
620 : : /**
621 : : * Reconsider orphan transactions after a parent has been accepted to the mempool.
622 : : *
623 : : * @peer[in] peer The peer whose orphan transactions we will reconsider. Generally only
624 : : * one orphan will be reconsidered on each call of this function. If an
625 : : * accepted orphan has orphaned children, those will need to be
626 : : * reconsidered, creating more work, possibly for other peers.
627 : : * @return True if meaningful work was done (an orphan was accepted/rejected).
628 : : * If no meaningful work was done, then the work set for this peer
629 : : * will be empty.
630 : : */
631 : : bool ProcessOrphanTx(Peer& peer)
632 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex, !m_tx_download_mutex);
633 : :
634 : : /** Process a single headers message from a peer.
635 : : *
636 : : * @param[in] pfrom CNode of the peer
637 : : * @param[in] peer The peer sending us the headers
638 : : * @param[in] headers The headers received. Note that this may be modified within ProcessHeadersMessage.
639 : : * @param[in] via_compact_block Whether this header came in via compact block handling.
640 : : */
641 : : void ProcessHeadersMessage(CNode& pfrom, Peer& peer,
642 : : std::vector<CBlockHeader>&& headers,
643 : : bool via_compact_block)
644 : : EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, !m_headers_presync_mutex, g_msgproc_mutex);
645 : : /** Various helpers for headers processing, invoked by ProcessHeadersMessage() */
646 : : /** Return true if headers are continuous and have valid proof-of-work (DoS points assigned on failure) */
647 : : bool CheckHeadersPoW(const std::vector<CBlockHeader>& headers, const Consensus::Params& consensusParams, Peer& peer);
648 : : /** Calculate an anti-DoS work threshold for headers chains */
649 : : arith_uint256 GetAntiDoSWorkThreshold();
650 : : /** Deal with state tracking and headers sync for peers that send
651 : : * non-connecting headers (this can happen due to BIP 130 headers
652 : : * announcements for blocks interacting with the 2hr (MAX_FUTURE_BLOCK_TIME) rule). */
653 : : void HandleUnconnectingHeaders(CNode& pfrom, Peer& peer, const std::vector<CBlockHeader>& headers) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
654 : : /** Return true if the headers connect to each other, false otherwise */
655 : : bool CheckHeadersAreContinuous(const std::vector<CBlockHeader>& headers) const;
656 : : /** Try to continue a low-work headers sync that has already begun.
657 : : * Assumes the caller has already verified the headers connect, and has
658 : : * checked that each header satisfies the proof-of-work target included in
659 : : * the header.
660 : : * @param[in] peer The peer we're syncing with.
661 : : * @param[in] pfrom CNode of the peer
662 : : * @param[in,out] headers The headers to be processed.
663 : : * @return True if the passed in headers were successfully processed
664 : : * as the continuation of a low-work headers sync in progress;
665 : : * false otherwise.
666 : : * If false, the passed in headers will be returned back to
667 : : * the caller.
668 : : * If true, the returned headers may be empty, indicating
669 : : * there is no more work for the caller to do; or the headers
670 : : * may be populated with entries that have passed anti-DoS
671 : : * checks (and therefore may be validated for block index
672 : : * acceptance by the caller).
673 : : */
674 : : bool IsContinuationOfLowWorkHeadersSync(Peer& peer, CNode& pfrom,
675 : : std::vector<CBlockHeader>& headers)
676 : : EXCLUSIVE_LOCKS_REQUIRED(peer.m_headers_sync_mutex, !m_headers_presync_mutex, g_msgproc_mutex);
677 : : /** Check work on a headers chain to be processed, and if insufficient,
678 : : * initiate our anti-DoS headers sync mechanism.
679 : : *
680 : : * @param[in] peer The peer whose headers we're processing.
681 : : * @param[in] pfrom CNode of the peer
682 : : * @param[in] chain_start_header Where these headers connect in our index.
683 : : * @param[in,out] headers The headers to be processed.
684 : : *
685 : : * @return True if chain was low work (headers will be empty after
686 : : * calling); false otherwise.
687 : : */
688 : : bool TryLowWorkHeadersSync(Peer& peer, CNode& pfrom,
689 : : const CBlockIndex* chain_start_header,
690 : : std::vector<CBlockHeader>& headers)
691 : : EXCLUSIVE_LOCKS_REQUIRED(!peer.m_headers_sync_mutex, !m_peer_mutex, !m_headers_presync_mutex, g_msgproc_mutex);
692 : :
693 : : /** Return true if the given header is an ancestor of
694 : : * m_chainman.m_best_header or our current tip */
695 : : bool IsAncestorOfBestHeaderOrTip(const CBlockIndex* header) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
696 : :
697 : : /** Request further headers from this peer with a given locator.
698 : : * We don't issue a getheaders message if we have a recent one outstanding.
699 : : * This returns true if a getheaders is actually sent, and false otherwise.
700 : : */
701 : : bool MaybeSendGetHeaders(CNode& pfrom, const CBlockLocator& locator, Peer& peer) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
702 : : /** Potentially fetch blocks from this peer upon receipt of a new headers tip */
703 : : void HeadersDirectFetchBlocks(CNode& pfrom, const Peer& peer, const CBlockIndex& last_header);
704 : : /** Update peer state based on received headers message */
705 : : void UpdatePeerStateForReceivedHeaders(CNode& pfrom, Peer& peer, const CBlockIndex& last_header, bool received_new_header, bool may_have_more_headers)
706 : : EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
707 : :
708 : : void SendBlockTransactions(CNode& pfrom, Peer& peer, const CBlock& block, const BlockTransactionsRequest& req);
709 : :
710 : : /** Send a message to a peer */
711 [ # # ]: 0 : void PushMessage(CNode& node, CSerializedNetMsg&& msg) const { m_connman.PushMessage(&node, std::move(msg)); }
712 : : template <typename... Args>
713 : 88052 : void MakeAndPushMessage(CNode& node, std::string msg_type, Args&&... args) const
714 : : {
715 [ + - + - ]: 176104 : m_connman.PushMessage(&node, NetMsg::Make(std::move(msg_type), std::forward<Args>(args)...));
716 : 88052 : }
717 : :
718 : : /** Send a version message to a peer */
719 : : void PushNodeVersion(CNode& pnode, const Peer& peer);
720 : :
721 : : /** Send a ping message every PING_INTERVAL or if requested via RPC. May
722 : : * mark the peer to be disconnected if a ping has timed out.
723 : : * We use mockable time for ping timeouts, so setmocktime may cause pings
724 : : * to time out. */
725 : : void MaybeSendPing(CNode& node_to, Peer& peer, std::chrono::microseconds now);
726 : :
727 : : /** Send `addr` messages on a regular schedule. */
728 : : void MaybeSendAddr(CNode& node, Peer& peer, std::chrono::microseconds current_time) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
729 : :
730 : : /** Send a single `sendheaders` message, after we have completed headers sync with a peer. */
731 : : void MaybeSendSendHeaders(CNode& node, Peer& peer) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
732 : :
733 : : /** Relay (gossip) an address to a few randomly chosen nodes.
734 : : *
735 : : * @param[in] originator The id of the peer that sent us the address. We don't want to relay it back.
736 : : * @param[in] addr Address to relay.
737 : : * @param[in] fReachable Whether the address' network is reachable. We relay unreachable
738 : : * addresses less.
739 : : */
740 : : void RelayAddress(NodeId originator, const CAddress& addr, bool fReachable) EXCLUSIVE_LOCKS_REQUIRED(!m_peer_mutex, g_msgproc_mutex);
741 : :
742 : : /** Send `feefilter` message. */
743 : : void MaybeSendFeefilter(CNode& node, Peer& peer, std::chrono::microseconds current_time) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
744 : :
745 : : FastRandomContext m_rng GUARDED_BY(NetEventsInterface::g_msgproc_mutex);
746 : :
747 : : FeeFilterRounder m_fee_filter_rounder GUARDED_BY(NetEventsInterface::g_msgproc_mutex);
748 : :
749 : : const CChainParams& m_chainparams;
750 : : CConnman& m_connman;
751 : : AddrMan& m_addrman;
752 : : /** Pointer to this node's banman. May be nullptr - check existence before dereferencing. */
753 : : BanMan* const m_banman;
754 : : ChainstateManager& m_chainman;
755 : : CTxMemPool& m_mempool;
756 : :
757 : : /** Synchronizes tx download including TxRequestTracker, rejection filters, and TxOrphanage.
758 : : * Lock invariants:
759 : : * - A txhash (txid or wtxid) in m_txrequest is not also in m_orphanage.
760 : : * - A txhash (txid or wtxid) in m_txrequest is not also in m_lazy_recent_rejects.
761 : : * - A txhash (txid or wtxid) in m_txrequest is not also in m_lazy_recent_rejects_reconsiderable.
762 : : * - A txhash (txid or wtxid) in m_txrequest is not also in m_lazy_recent_confirmed_transactions.
763 : : * - Each data structure's limits hold (m_orphanage max size, m_txrequest per-peer limits, etc).
764 : : */
765 : : Mutex m_tx_download_mutex ACQUIRED_BEFORE(m_mempool.cs);
766 : : node::TxDownloadManager m_txdownloadman GUARDED_BY(m_tx_download_mutex);
767 : :
768 : : std::unique_ptr<TxReconciliationTracker> m_txreconciliation;
769 : :
770 : : /** The height of the best chain */
771 : : std::atomic<int> m_best_height{-1};
772 : : /** The time of the best chain tip block */
773 : : std::atomic<std::chrono::seconds> m_best_block_time{0s};
774 : :
775 : : /** Next time to check for stale tip */
776 : : std::chrono::seconds m_stale_tip_check_time GUARDED_BY(cs_main){0s};
777 : :
778 : : node::Warnings& m_warnings;
779 : : TimeOffsets m_outbound_time_offsets{m_warnings};
780 : :
781 : : const Options m_opts;
782 : :
783 : : bool RejectIncomingTxs(const CNode& peer) const;
784 : :
785 : : /** Whether we've completed initial sync yet, for determining when to turn
786 : : * on extra block-relay-only peers. */
787 : : bool m_initial_sync_finished GUARDED_BY(cs_main){false};
788 : :
789 : : /** Protects m_peer_map. This mutex must not be locked while holding a lock
790 : : * on any of the mutexes inside a Peer object. */
791 : : mutable Mutex m_peer_mutex;
792 : : /**
793 : : * Map of all Peer objects, keyed by peer id. This map is protected
794 : : * by the m_peer_mutex. Once a shared pointer reference is
795 : : * taken, the lock may be released. Individual fields are protected by
796 : : * their own locks.
797 : : */
798 : : std::map<NodeId, PeerRef> m_peer_map GUARDED_BY(m_peer_mutex);
799 : :
800 : : /** Map maintaining per-node state. */
801 : : std::map<NodeId, CNodeState> m_node_states GUARDED_BY(cs_main);
802 : :
803 : : /** Get a pointer to a const CNodeState, used when not mutating the CNodeState object. */
804 : : const CNodeState* State(NodeId pnode) const EXCLUSIVE_LOCKS_REQUIRED(cs_main);
805 : : /** Get a pointer to a mutable CNodeState. */
806 : : CNodeState* State(NodeId pnode) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
807 : :
808 : : uint32_t GetFetchFlags(const Peer& peer) const;
809 : :
810 : : std::atomic<std::chrono::microseconds> m_next_inv_to_inbounds{0us};
811 : :
812 : : /** Number of nodes with fSyncStarted. */
813 : : int nSyncStarted GUARDED_BY(cs_main) = 0;
814 : :
815 : : /** Hash of the last block we received via INV */
816 : : uint256 m_last_block_inv_triggering_headers_sync GUARDED_BY(g_msgproc_mutex){};
817 : :
818 : : /**
819 : : * Sources of received blocks, saved to be able punish them when processing
820 : : * happens afterwards.
821 : : * Set mapBlockSource[hash].second to false if the node should not be
822 : : * punished if the block is invalid.
823 : : */
824 : : std::map<uint256, std::pair<NodeId, bool>> mapBlockSource GUARDED_BY(cs_main);
825 : :
826 : : /** Number of peers with wtxid relay. */
827 : : std::atomic<int> m_wtxid_relay_peers{0};
828 : :
829 : : /** Number of outbound peers with m_chain_sync.m_protect. */
830 : : int m_outbound_peers_with_protect_from_disconnect GUARDED_BY(cs_main) = 0;
831 : :
832 : : /** Number of preferable block download peers. */
833 : : int m_num_preferred_download_peers GUARDED_BY(cs_main){0};
834 : :
835 : : /** Stalling timeout for blocks in IBD */
836 : : std::atomic<std::chrono::seconds> m_block_stalling_timeout{BLOCK_STALLING_TIMEOUT_DEFAULT};
837 : :
838 : : /**
839 : : * For sending `inv`s to inbound peers, we use a single (exponentially
840 : : * distributed) timer for all peers. If we used a separate timer for each
841 : : * peer, a spy node could make multiple inbound connections to us to
842 : : * accurately determine when we received the transaction (and potentially
843 : : * determine the transaction's origin). */
844 : : std::chrono::microseconds NextInvToInbounds(std::chrono::microseconds now,
845 : : std::chrono::seconds average_interval) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
846 : :
847 : :
848 : : // All of the following cache a recent block, and are protected by m_most_recent_block_mutex
849 : : Mutex m_most_recent_block_mutex;
850 : : std::shared_ptr<const CBlock> m_most_recent_block GUARDED_BY(m_most_recent_block_mutex);
851 : : std::shared_ptr<const CBlockHeaderAndShortTxIDs> m_most_recent_compact_block GUARDED_BY(m_most_recent_block_mutex);
852 : : uint256 m_most_recent_block_hash GUARDED_BY(m_most_recent_block_mutex);
853 : : std::unique_ptr<const std::map<GenTxid, CTransactionRef>> m_most_recent_block_txs GUARDED_BY(m_most_recent_block_mutex);
854 : :
855 : : // Data about the low-work headers synchronization, aggregated from all peers' HeadersSyncStates.
856 : : /** Mutex guarding the other m_headers_presync_* variables. */
857 : : Mutex m_headers_presync_mutex;
858 : : /** A type to represent statistics about a peer's low-work headers sync.
859 : : *
860 : : * - The first field is the total verified amount of work in that synchronization.
861 : : * - The second is:
862 : : * - nullopt: the sync is in REDOWNLOAD phase (phase 2).
863 : : * - {height, timestamp}: the sync has the specified tip height and block timestamp (phase 1).
864 : : */
865 : : using HeadersPresyncStats = std::pair<arith_uint256, std::optional<std::pair<int64_t, uint32_t>>>;
866 : : /** Statistics for all peers in low-work headers sync. */
867 : : std::map<NodeId, HeadersPresyncStats> m_headers_presync_stats GUARDED_BY(m_headers_presync_mutex) {};
868 : : /** The peer with the most-work entry in m_headers_presync_stats. */
869 : : NodeId m_headers_presync_bestpeer GUARDED_BY(m_headers_presync_mutex) {-1};
870 : : /** The m_headers_presync_stats improved, and needs signalling. */
871 : : std::atomic_bool m_headers_presync_should_signal{false};
872 : :
873 : : /** Height of the highest block announced using BIP 152 high-bandwidth mode. */
874 : : int m_highest_fast_announce GUARDED_BY(::cs_main){0};
875 : :
876 : : /** Have we requested this block from a peer */
877 : : bool IsBlockRequested(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
878 : :
879 : : /** Have we requested this block from an outbound peer */
880 : : bool IsBlockRequestedFromOutbound(const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main, !m_peer_mutex);
881 : :
882 : : /** Remove this block from our tracked requested blocks. Called if:
883 : : * - the block has been received from a peer
884 : : * - the request for the block has timed out
885 : : * If "from_peer" is specified, then only remove the block if it is in
886 : : * flight from that peer (to avoid one peer's network traffic from
887 : : * affecting another's state).
888 : : */
889 : : void RemoveBlockRequest(const uint256& hash, std::optional<NodeId> from_peer) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
890 : :
891 : : /* Mark a block as in flight
892 : : * Returns false, still setting pit, if the block was already in flight from the same peer
893 : : * pit will only be valid as long as the same cs_main lock is being held
894 : : */
895 : : bool BlockRequested(NodeId nodeid, const CBlockIndex& block, std::list<QueuedBlock>::iterator** pit = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
896 : :
897 : : bool TipMayBeStale() EXCLUSIVE_LOCKS_REQUIRED(cs_main);
898 : :
899 : : /** Update pindexLastCommonBlock and add not-in-flight missing successors to vBlocks, until it has
900 : : * at most count entries.
901 : : */
902 : : void FindNextBlocksToDownload(const Peer& peer, unsigned int count, std::vector<const CBlockIndex*>& vBlocks, NodeId& nodeStaller) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
903 : :
904 : : /** Request blocks for the background chainstate, if one is in use. */
905 : : 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);
906 : :
907 : : /**
908 : : * \brief Find next blocks to download from a peer after a starting block.
909 : : *
910 : : * \param vBlocks Vector of blocks to download which will be appended to.
911 : : * \param peer Peer which blocks will be downloaded from.
912 : : * \param state Pointer to the state of the peer.
913 : : * \param pindexWalk Pointer to the starting block to add to vBlocks.
914 : : * \param count Maximum number of blocks to allow in vBlocks. No more
915 : : * blocks will be added if it reaches this size.
916 : : * \param nWindowEnd Maximum height of blocks to allow in vBlocks. No
917 : : * blocks will be added above this height.
918 : : * \param activeChain Optional pointer to a chain to compare against. If
919 : : * provided, any next blocks which are already contained
920 : : * in this chain will not be appended to vBlocks, but
921 : : * instead will be used to update the
922 : : * state->pindexLastCommonBlock pointer.
923 : : * \param nodeStaller Optional pointer to a NodeId variable that will receive
924 : : * the ID of another peer that might be causing this peer
925 : : * to stall. This is set to the ID of the peer which
926 : : * first requested the first in-flight block in the
927 : : * download window. It is only set if vBlocks is empty at
928 : : * the end of this function call and if increasing
929 : : * nWindowEnd by 1 would cause it to be non-empty (which
930 : : * indicates the download might be stalled because every
931 : : * block in the window is in flight and no other peer is
932 : : * trying to download the next block).
933 : : */
934 : : 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);
935 : :
936 : : /* Multimap used to preserve insertion order */
937 : : typedef std::multimap<uint256, std::pair<NodeId, std::list<QueuedBlock>::iterator>> BlockDownloadMap;
938 : : BlockDownloadMap mapBlocksInFlight GUARDED_BY(cs_main);
939 : :
940 : : /** When our tip was last updated. */
941 : : std::atomic<std::chrono::seconds> m_last_tip_update{0s};
942 : :
943 : : /** Determine whether or not a peer can request a transaction, and return it (or nullptr if not found or not allowed). */
944 : : CTransactionRef FindTxForGetData(const Peer::TxRelay& tx_relay, const GenTxid& gtxid)
945 : : EXCLUSIVE_LOCKS_REQUIRED(!m_most_recent_block_mutex, NetEventsInterface::g_msgproc_mutex);
946 : :
947 : : void ProcessGetData(CNode& pfrom, Peer& peer, const std::atomic<bool>& interruptMsgProc)
948 : : EXCLUSIVE_LOCKS_REQUIRED(!m_most_recent_block_mutex, peer.m_getdata_requests_mutex, NetEventsInterface::g_msgproc_mutex)
949 : : LOCKS_EXCLUDED(::cs_main);
950 : :
951 : : /** Process a new block. Perform any post-processing housekeeping */
952 : : void ProcessBlock(CNode& node, const std::shared_ptr<const CBlock>& block, bool force_processing, bool min_pow_checked);
953 : :
954 : : /** Process compact block txns */
955 : : void ProcessCompactBlockTxns(CNode& pfrom, Peer& peer, const BlockTransactions& block_transactions)
956 : : EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex, !m_most_recent_block_mutex);
957 : :
958 : : /**
959 : : * When a peer sends us a valid block, instruct it to announce blocks to us
960 : : * using CMPCTBLOCK if possible by adding its nodeid to the end of
961 : : * lNodesAnnouncingHeaderAndIDs, and keeping that list under a certain size by
962 : : * removing the first element if necessary.
963 : : */
964 : : void MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid) EXCLUSIVE_LOCKS_REQUIRED(cs_main, !m_peer_mutex);
965 : :
966 : : /** Stack of nodes which we have set to announce using compact blocks */
967 : : std::list<NodeId> lNodesAnnouncingHeaderAndIDs GUARDED_BY(cs_main);
968 : :
969 : : /** Number of peers from which we're downloading blocks. */
970 : : int m_peers_downloading_from GUARDED_BY(cs_main) = 0;
971 : :
972 : : void AddToCompactExtraTransactions(const CTransactionRef& tx) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
973 : :
974 : : /** Orphan/conflicted/etc transactions that are kept for compact block reconstruction.
975 : : * The last -blockreconstructionextratxn/DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN of
976 : : * these are kept in a ring buffer */
977 : : std::vector<std::pair<Wtxid, CTransactionRef>> vExtraTxnForCompact GUARDED_BY(g_msgproc_mutex);
978 : : /** Offset into vExtraTxnForCompact to insert the next tx */
979 : : size_t vExtraTxnForCompactIt GUARDED_BY(g_msgproc_mutex) = 0;
980 : :
981 : : /** Check whether the last unknown block a peer advertised is not yet known. */
982 : : void ProcessBlockAvailability(NodeId nodeid) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
983 : : /** Update tracking information about which blocks a peer is assumed to have. */
984 : : void UpdateBlockAvailability(NodeId nodeid, const uint256& hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
985 : : bool CanDirectFetch() EXCLUSIVE_LOCKS_REQUIRED(cs_main);
986 : :
987 : : /**
988 : : * Estimates the distance, in blocks, between the best-known block and the network chain tip.
989 : : * Utilizes the best-block time and the chainparams blocks spacing to approximate it.
990 : : */
991 : : int64_t ApproximateBestBlockDepth() const;
992 : :
993 : : /**
994 : : * To prevent fingerprinting attacks, only send blocks/headers outside of
995 : : * the active chain if they are no more than a month older (both in time,
996 : : * and in best equivalent proof of work) than the best header chain we know
997 : : * about and we fully-validated them at some point.
998 : : */
999 : : bool BlockRequestAllowed(const CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
1000 : : bool AlreadyHaveBlock(const uint256& block_hash) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
1001 : : void ProcessGetBlockData(CNode& pfrom, Peer& peer, const CInv& inv)
1002 : : EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex, !m_most_recent_block_mutex);
1003 : :
1004 : : /**
1005 : : * Validation logic for compact filters request handling.
1006 : : *
1007 : : * May disconnect from the peer in the case of a bad request.
1008 : : *
1009 : : * @param[in] node The node that we received the request from
1010 : : * @param[in] peer The peer that we received the request from
1011 : : * @param[in] filter_type The filter type the request is for. Must be basic filters.
1012 : : * @param[in] start_height The start height for the request
1013 : : * @param[in] stop_hash The stop_hash for the request
1014 : : * @param[in] max_height_diff The maximum number of items permitted to request, as specified in BIP 157
1015 : : * @param[out] stop_index The CBlockIndex for the stop_hash block, if the request can be serviced.
1016 : : * @param[out] filter_index The filter index, if the request can be serviced.
1017 : : * @return True if the request can be serviced.
1018 : : */
1019 : : bool PrepareBlockFilterRequest(CNode& node, Peer& peer,
1020 : : BlockFilterType filter_type, uint32_t start_height,
1021 : : const uint256& stop_hash, uint32_t max_height_diff,
1022 : : const CBlockIndex*& stop_index,
1023 : : BlockFilterIndex*& filter_index);
1024 : :
1025 : : /**
1026 : : * Handle a cfilters request.
1027 : : *
1028 : : * May disconnect from the peer in the case of a bad request.
1029 : : *
1030 : : * @param[in] node The node that we received the request from
1031 : : * @param[in] peer The peer that we received the request from
1032 : : * @param[in] vRecv The raw message received
1033 : : */
1034 : : void ProcessGetCFilters(CNode& node, Peer& peer, DataStream& vRecv);
1035 : :
1036 : : /**
1037 : : * Handle a cfheaders request.
1038 : : *
1039 : : * May disconnect from the peer in the case of a bad request.
1040 : : *
1041 : : * @param[in] node The node that we received the request from
1042 : : * @param[in] peer The peer that we received the request from
1043 : : * @param[in] vRecv The raw message received
1044 : : */
1045 : : void ProcessGetCFHeaders(CNode& node, Peer& peer, DataStream& vRecv);
1046 : :
1047 : : /**
1048 : : * Handle a getcfcheckpt request.
1049 : : *
1050 : : * May disconnect from the peer in the case of a bad request.
1051 : : *
1052 : : * @param[in] node The node that we received the request from
1053 : : * @param[in] peer The peer that we received the request from
1054 : : * @param[in] vRecv The raw message received
1055 : : */
1056 : : void ProcessGetCFCheckPt(CNode& node, Peer& peer, DataStream& vRecv);
1057 : :
1058 : : /** Checks if address relay is permitted with peer. If needed, initializes
1059 : : * the m_addr_known bloom filter and sets m_addr_relay_enabled to true.
1060 : : *
1061 : : * @return True if address relay is enabled with peer
1062 : : * False if address relay is disallowed
1063 : : */
1064 : : bool SetupAddressRelay(const CNode& node, Peer& peer) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
1065 : :
1066 : : void AddAddressKnown(Peer& peer, const CAddress& addr) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
1067 : : void PushAddress(Peer& peer, const CAddress& addr) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex);
1068 : :
1069 : : void LogBlockHeader(const CBlockIndex& index, const CNode& peer, bool via_compact_block);
1070 : : };
1071 : :
1072 : 200167 : const CNodeState* PeerManagerImpl::State(NodeId pnode) const
1073 : : {
1074 : 200167 : std::map<NodeId, CNodeState>::const_iterator it = m_node_states.find(pnode);
1075 [ + - ]: 200167 : if (it == m_node_states.end())
1076 : : return nullptr;
1077 : 200167 : return &it->second;
1078 : : }
1079 : :
1080 : 193194 : CNodeState* PeerManagerImpl::State(NodeId pnode)
1081 : : {
1082 : 193194 : return const_cast<CNodeState*>(std::as_const(*this).State(pnode));
1083 : : }
1084 : :
1085 : : /**
1086 : : * Whether the peer supports the address. For example, a peer that does not
1087 : : * implement BIP155 cannot receive Tor v3 addresses because it requires
1088 : : * ADDRv2 (BIP155) encoding.
1089 : : */
1090 : 1140 : static bool IsAddrCompatible(const Peer& peer, const CAddress& addr)
1091 : : {
1092 [ + + + - ]: 1140 : return peer.m_wants_addrv2 || addr.IsAddrV1Compatible();
1093 : : }
1094 : :
1095 : 201095 : void PeerManagerImpl::AddAddressKnown(Peer& peer, const CAddress& addr)
1096 : : {
1097 [ - + ]: 201095 : assert(peer.m_addr_known);
1098 [ - + + - ]: 201095 : peer.m_addr_known->insert(addr.GetKey());
1099 : 201095 : }
1100 : :
1101 : 613 : void PeerManagerImpl::PushAddress(Peer& peer, const CAddress& addr)
1102 : : {
1103 : : // Known checking here is only to save space from duplicates.
1104 : : // Before sending, we'll filter it again for known addresses that were
1105 : : // added after addresses were pushed.
1106 [ - + ]: 613 : assert(peer.m_addr_known);
1107 [ + - - + : 1226 : if (addr.IsValid() && !peer.m_addr_known->contains(addr.GetKey()) && IsAddrCompatible(peer, addr)) {
+ - + + +
- + - +
+ ]
1108 [ - + - + ]: 527 : if (peer.m_addrs_to_send.size() >= MAX_ADDR_TO_SEND) {
1109 : 0 : peer.m_addrs_to_send[m_rng.randrange(peer.m_addrs_to_send.size())] = addr;
1110 : : } else {
1111 : 527 : peer.m_addrs_to_send.push_back(addr);
1112 : : }
1113 : : }
1114 : 613 : }
1115 : :
1116 : 186966 : static void AddKnownTx(Peer& peer, const uint256& hash)
1117 : : {
1118 : 186966 : auto tx_relay = peer.GetTxRelay();
1119 [ + + ]: 186966 : if (!tx_relay) return;
1120 : :
1121 : 123131 : LOCK(tx_relay->m_tx_inventory_mutex);
1122 [ + - ]: 123131 : tx_relay->m_tx_inventory_known_filter.insert(hash);
1123 : 123131 : }
1124 : :
1125 : : /** Whether this peer can serve us blocks. */
1126 : 47051 : static bool CanServeBlocks(const Peer& peer)
1127 : : {
1128 : 47051 : return peer.m_their_services & (NODE_NETWORK|NODE_NETWORK_LIMITED);
1129 : : }
1130 : :
1131 : : /** Whether this peer can only serve limited recent blocks (e.g. because
1132 : : * it prunes old blocks) */
1133 : 22848 : static bool IsLimitedPeer(const Peer& peer)
1134 : : {
1135 [ + + - + ]: 22848 : return (!(peer.m_their_services & NODE_NETWORK) &&
1136 [ - + ]: 442 : (peer.m_their_services & NODE_NETWORK_LIMITED));
1137 : : }
1138 : :
1139 : : /** Whether this peer can serve us witness data */
1140 : 230 : static bool CanServeWitnesses(const Peer& peer)
1141 : : {
1142 : 230 : return peer.m_their_services & NODE_WITNESS;
1143 : : }
1144 : :
1145 : 2421 : std::chrono::microseconds PeerManagerImpl::NextInvToInbounds(std::chrono::microseconds now,
1146 : : std::chrono::seconds average_interval)
1147 : : {
1148 [ + + ]: 2421 : if (m_next_inv_to_inbounds.load() < now) {
1149 : : // If this function were called from multiple threads simultaneously
1150 : : // it would possible that both update the next send variable, and return a different result to their caller.
1151 : : // This is not possible in practice as only the net processing thread invokes this function.
1152 : 1721 : m_next_inv_to_inbounds = now + m_rng.rand_exp_duration(average_interval);
1153 : : }
1154 : 2421 : return m_next_inv_to_inbounds;
1155 : : }
1156 : :
1157 : 12263 : bool PeerManagerImpl::IsBlockRequested(const uint256& hash)
1158 : : {
1159 : 12263 : return mapBlocksInFlight.count(hash);
1160 : : }
1161 : :
1162 : 0 : bool PeerManagerImpl::IsBlockRequestedFromOutbound(const uint256& hash)
1163 : : {
1164 [ # # ]: 0 : for (auto range = mapBlocksInFlight.equal_range(hash); range.first != range.second; range.first++) {
1165 : 0 : auto [nodeid, block_it] = range.first->second;
1166 : 0 : PeerRef peer{GetPeerRef(nodeid)};
1167 [ # # # # : 0 : if (peer && !peer->m_is_inbound) return true;
# # ]
1168 : 0 : }
1169 : :
1170 : : return false;
1171 : : }
1172 : :
1173 : 9773 : void PeerManagerImpl::RemoveBlockRequest(const uint256& hash, std::optional<NodeId> from_peer)
1174 : : {
1175 : 9773 : auto range = mapBlocksInFlight.equal_range(hash);
1176 [ - + ]: 9773 : if (range.first == range.second) {
1177 : : // Block was not requested from any peer
1178 : : return;
1179 : : }
1180 : :
1181 : : // We should not have requested too many of this block
1182 : 0 : Assume(mapBlocksInFlight.count(hash) <= MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK);
1183 : :
1184 [ # # ]: 0 : while (range.first != range.second) {
1185 [ # # ]: 0 : const auto& [node_id, list_it]{range.first->second};
1186 : :
1187 [ # # # # ]: 0 : if (from_peer && *from_peer != node_id) {
1188 : 0 : range.first++;
1189 : 0 : continue;
1190 : : }
1191 : :
1192 : 0 : CNodeState& state = *Assert(State(node_id));
1193 : :
1194 [ # # ]: 0 : if (state.vBlocksInFlight.begin() == list_it) {
1195 : : // First block on the queue was received, update the start download time for the next one
1196 : 0 : state.m_downloading_since = std::max(state.m_downloading_since, GetTime<std::chrono::microseconds>());
1197 : : }
1198 : 0 : state.vBlocksInFlight.erase(list_it);
1199 : :
1200 [ # # ]: 0 : if (state.vBlocksInFlight.empty()) {
1201 : : // Last validated block on the queue for this peer was received.
1202 : 0 : m_peers_downloading_from--;
1203 : : }
1204 : 0 : state.m_stalling_since = 0us;
1205 : :
1206 : 0 : range.first = mapBlocksInFlight.erase(range.first);
1207 : : }
1208 : : }
1209 : :
1210 : 103 : bool PeerManagerImpl::BlockRequested(NodeId nodeid, const CBlockIndex& block, std::list<QueuedBlock>::iterator** pit)
1211 : : {
1212 : 103 : const uint256& hash{block.GetBlockHash()};
1213 : :
1214 : 103 : CNodeState *state = State(nodeid);
1215 [ - + ]: 103 : assert(state != nullptr);
1216 : :
1217 : 103 : Assume(mapBlocksInFlight.count(hash) <= MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK);
1218 : :
1219 : : // Short-circuit most stuff in case it is from the same node
1220 [ - + ]: 103 : for (auto range = mapBlocksInFlight.equal_range(hash); range.first != range.second; range.first++) {
1221 [ # # ]: 0 : if (range.first->second.first == nodeid) {
1222 [ # # ]: 0 : if (pit) {
1223 : 0 : *pit = &range.first->second.second;
1224 : : }
1225 : 0 : return false;
1226 : : }
1227 : : }
1228 : :
1229 : : // Make sure it's not being fetched already from same peer.
1230 : 103 : RemoveBlockRequest(hash, nodeid);
1231 : :
1232 : 103 : std::list<QueuedBlock>::iterator it = state->vBlocksInFlight.insert(state->vBlocksInFlight.end(),
1233 : 0 : {&block, std::unique_ptr<PartiallyDownloadedBlock>(pit ? new PartiallyDownloadedBlock(&m_mempool) : nullptr)});
1234 [ + + ]: 103 : if (state->vBlocksInFlight.size() == 1) {
1235 : : // We're starting a block download (batch) from this peer.
1236 : 35 : state->m_downloading_since = GetTime<std::chrono::microseconds>();
1237 : 35 : m_peers_downloading_from++;
1238 : : }
1239 : 103 : auto itInFlight = mapBlocksInFlight.insert(std::make_pair(hash, std::make_pair(nodeid, it)));
1240 [ - + ]: 103 : if (pit) {
1241 : 0 : *pit = &itInFlight->second.second;
1242 : : }
1243 : : return true;
1244 [ - + + - ]: 103 : }
1245 : :
1246 : 0 : void PeerManagerImpl::MaybeSetPeerAsAnnouncingHeaderAndIDs(NodeId nodeid)
1247 : : {
1248 : 0 : AssertLockHeld(cs_main);
1249 : :
1250 : : // When in -blocksonly mode, never request high-bandwidth mode from peers. Our
1251 : : // mempool will not contain the transactions necessary to reconstruct the
1252 : : // compact block.
1253 [ # # ]: 0 : if (m_opts.ignore_incoming_txs) return;
1254 : :
1255 : 0 : CNodeState* nodestate = State(nodeid);
1256 : 0 : PeerRef peer{GetPeerRef(nodeid)};
1257 [ # # # # ]: 0 : if (!nodestate || !nodestate->m_provides_cmpctblocks) {
1258 : : // Don't request compact blocks if the peer has not signalled support
1259 : : return;
1260 : : }
1261 : :
1262 : 0 : int num_outbound_hb_peers = 0;
1263 [ # # ]: 0 : for (std::list<NodeId>::iterator it = lNodesAnnouncingHeaderAndIDs.begin(); it != lNodesAnnouncingHeaderAndIDs.end(); it++) {
1264 [ # # ]: 0 : if (*it == nodeid) {
1265 : 0 : lNodesAnnouncingHeaderAndIDs.erase(it);
1266 [ # # ]: 0 : lNodesAnnouncingHeaderAndIDs.push_back(nodeid);
1267 : : return;
1268 : : }
1269 [ # # ]: 0 : PeerRef peer_ref{GetPeerRef(*it)};
1270 [ # # # # ]: 0 : if (peer_ref && !peer_ref->m_is_inbound) ++num_outbound_hb_peers;
1271 : 0 : }
1272 [ # # # # ]: 0 : if (peer && peer->m_is_inbound) {
1273 : : // If we're adding an inbound HB peer, make sure we're not removing
1274 : : // our last outbound HB peer in the process.
1275 [ # # # # ]: 0 : if (lNodesAnnouncingHeaderAndIDs.size() >= 3 && num_outbound_hb_peers == 1) {
1276 [ # # ]: 0 : PeerRef remove_peer{GetPeerRef(lNodesAnnouncingHeaderAndIDs.front())};
1277 [ # # # # ]: 0 : if (remove_peer && !remove_peer->m_is_inbound) {
1278 : : // Put the HB outbound peer in the second slot, so that it
1279 : : // doesn't get removed.
1280 : 0 : std::swap(lNodesAnnouncingHeaderAndIDs.front(), *std::next(lNodesAnnouncingHeaderAndIDs.begin()));
1281 : : }
1282 : 0 : }
1283 : : }
1284 [ # # # # ]: 0 : m_connman.ForNode(nodeid, [this](CNode* pfrom) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
1285 : 0 : AssertLockHeld(::cs_main);
1286 [ # # ]: 0 : if (lNodesAnnouncingHeaderAndIDs.size() >= 3) {
1287 : : // As per BIP152, we only get 3 of our peers to announce
1288 : : // blocks using compact encodings.
1289 [ # # ]: 0 : m_connman.ForNode(lNodesAnnouncingHeaderAndIDs.front(), [this](CNode* pnodeStop){
1290 [ # # ]: 0 : MakeAndPushMessage(*pnodeStop, NetMsgType::SENDCMPCT, /*high_bandwidth=*/false, /*version=*/CMPCTBLOCKS_VERSION);
1291 : : // save BIP152 bandwidth state: we select peer to be low-bandwidth
1292 : 0 : pnodeStop->m_bip152_highbandwidth_to = false;
1293 : 0 : return true;
1294 : : });
1295 : 0 : lNodesAnnouncingHeaderAndIDs.pop_front();
1296 : : }
1297 [ # # ]: 0 : MakeAndPushMessage(*pfrom, NetMsgType::SENDCMPCT, /*high_bandwidth=*/true, /*version=*/CMPCTBLOCKS_VERSION);
1298 : : // save BIP152 bandwidth state: we select peer to be high-bandwidth
1299 : 0 : pfrom->m_bip152_highbandwidth_to = true;
1300 : 0 : lNodesAnnouncingHeaderAndIDs.push_back(pfrom->GetId());
1301 : 0 : return true;
1302 : : });
1303 : 0 : }
1304 : :
1305 : 0 : bool PeerManagerImpl::TipMayBeStale()
1306 : : {
1307 : 0 : AssertLockHeld(cs_main);
1308 : 0 : const Consensus::Params& consensusParams = m_chainparams.GetConsensus();
1309 [ # # ]: 0 : if (m_last_tip_update.load() == 0s) {
1310 : 0 : m_last_tip_update = GetTime<std::chrono::seconds>();
1311 : : }
1312 [ # # # # ]: 0 : return m_last_tip_update.load() < GetTime<std::chrono::seconds>() - std::chrono::seconds{consensusParams.nPowTargetSpacing * 3} && mapBlocksInFlight.empty();
1313 : : }
1314 : :
1315 : 2758 : int64_t PeerManagerImpl::ApproximateBestBlockDepth() const
1316 : : {
1317 : 2758 : return (GetTime<std::chrono::seconds>() - m_best_block_time.load()).count() / m_chainparams.GetConsensus().nPowTargetSpacing;
1318 : : }
1319 : :
1320 : 4853 : bool PeerManagerImpl::CanDirectFetch()
1321 : : {
1322 [ - + ]: 9706 : return m_chainman.ActiveChain().Tip()->Time() > NodeClock::now() - m_chainparams.GetConsensus().PowTargetSpacing() * 20;
1323 : : }
1324 : :
1325 : 0 : static bool PeerHasHeader(CNodeState *state, const CBlockIndex *pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
1326 : : {
1327 [ # # # # ]: 0 : if (state->pindexBestKnownBlock && pindex == state->pindexBestKnownBlock->GetAncestor(pindex->nHeight))
1328 : : return true;
1329 [ # # # # ]: 0 : if (state->pindexBestHeaderSent && pindex == state->pindexBestHeaderSent->GetAncestor(pindex->nHeight))
1330 : 0 : return true;
1331 : : return false;
1332 : : }
1333 : :
1334 : 56549 : void PeerManagerImpl::ProcessBlockAvailability(NodeId nodeid) {
1335 : 56549 : CNodeState *state = State(nodeid);
1336 [ - + ]: 56549 : assert(state != nullptr);
1337 : :
1338 [ + + ]: 113098 : if (!state->hashLastUnknownBlock.IsNull()) {
1339 : 20685 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(state->hashLastUnknownBlock);
1340 [ - + - - ]: 20685 : if (pindex && pindex->nChainWork > 0) {
1341 [ # # # # ]: 0 : if (state->pindexBestKnownBlock == nullptr || pindex->nChainWork >= state->pindexBestKnownBlock->nChainWork) {
1342 : 0 : state->pindexBestKnownBlock = pindex;
1343 : : }
1344 : 0 : state->hashLastUnknownBlock.SetNull();
1345 : : }
1346 : : }
1347 : 56549 : }
1348 : :
1349 : 9012 : void PeerManagerImpl::UpdateBlockAvailability(NodeId nodeid, const uint256 &hash) {
1350 : 9012 : CNodeState *state = State(nodeid);
1351 [ - + ]: 9012 : assert(state != nullptr);
1352 : :
1353 : 9012 : ProcessBlockAvailability(nodeid);
1354 : :
1355 : 9012 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(hash);
1356 [ + + + - ]: 11358 : if (pindex && pindex->nChainWork > 0) {
1357 : : // An actually better block was announced.
1358 [ + + + + ]: 2346 : if (state->pindexBestKnownBlock == nullptr || pindex->nChainWork >= state->pindexBestKnownBlock->nChainWork) {
1359 : 1638 : state->pindexBestKnownBlock = pindex;
1360 : : }
1361 : : } else {
1362 : : // An unknown block was announced; just assume that the latest one is the best one.
1363 : 6666 : state->hashLastUnknownBlock = hash;
1364 : : }
1365 : 9012 : }
1366 : :
1367 : : // Logic for calculating which blocks to download from a given peer, given our current tip.
1368 : 22406 : void PeerManagerImpl::FindNextBlocksToDownload(const Peer& peer, unsigned int count, std::vector<const CBlockIndex*>& vBlocks, NodeId& nodeStaller)
1369 : : {
1370 [ + - ]: 22406 : if (count == 0)
1371 : : return;
1372 : :
1373 [ - + ]: 22406 : vBlocks.reserve(vBlocks.size() + count);
1374 : 22406 : CNodeState *state = State(peer.m_id);
1375 [ - + ]: 22406 : assert(state != nullptr);
1376 : :
1377 : : // Make sure pindexBestKnownBlock is up to date, we'll need it.
1378 : 22406 : ProcessBlockAvailability(peer.m_id);
1379 : :
1380 [ - + - - : 22406 : if (state->pindexBestKnownBlock == nullptr || state->pindexBestKnownBlock->nChainWork < m_chainman.ActiveChain().Tip()->nChainWork || state->pindexBestKnownBlock->nChainWork < m_chainman.MinimumChainWork()) {
- - - - ]
1381 : : // This peer has nothing interesting.
1382 : 22406 : return;
1383 : : }
1384 : :
1385 : : // When we sync with AssumeUtxo and discover the snapshot is not in the peer's best chain, abort:
1386 : : // We can't reorg to this chain due to missing undo data until the background sync has finished,
1387 : : // so downloading blocks from it would be futile.
1388 : 0 : const CBlockIndex* snap_base{m_chainman.GetSnapshotBaseBlock()};
1389 [ # # # # ]: 0 : if (snap_base && state->pindexBestKnownBlock->GetAncestor(snap_base->nHeight) != snap_base) {
1390 [ # # ]: 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);
1391 : 0 : return;
1392 : : }
1393 : :
1394 : : // Bootstrap quickly by guessing a parent of our best tip is the forking point.
1395 : : // Guessing wrong in either direction is not a problem.
1396 : : // Also reset pindexLastCommonBlock after a snapshot was loaded, so that blocks after the snapshot will be prioritised for download.
1397 [ # # # # ]: 0 : if (state->pindexLastCommonBlock == nullptr ||
1398 [ # # ]: 0 : (snap_base && state->pindexLastCommonBlock->nHeight < snap_base->nHeight)) {
1399 [ # # # # : 0 : state->pindexLastCommonBlock = m_chainman.ActiveChain()[std::min(state->pindexBestKnownBlock->nHeight, m_chainman.ActiveChain().Height())];
# # ]
1400 : : }
1401 : :
1402 : : // If the peer reorganized, our previous pindexLastCommonBlock may not be an ancestor
1403 : : // of its current tip anymore. Go back enough to fix that.
1404 : 0 : state->pindexLastCommonBlock = LastCommonAncestor(state->pindexLastCommonBlock, state->pindexBestKnownBlock);
1405 [ # # ]: 0 : if (state->pindexLastCommonBlock == state->pindexBestKnownBlock)
1406 : : return;
1407 : :
1408 : 0 : const CBlockIndex *pindexWalk = state->pindexLastCommonBlock;
1409 : : // Never fetch further than the best block we know the peer has, or more than BLOCK_DOWNLOAD_WINDOW + 1 beyond the last
1410 : : // linked block we have in common with this peer. The +1 is so we can detect stalling, namely if we would be able to
1411 : : // download that next block if the window were 1 larger.
1412 : 0 : int nWindowEnd = state->pindexLastCommonBlock->nHeight + BLOCK_DOWNLOAD_WINDOW;
1413 : :
1414 : 0 : FindNextBlocks(vBlocks, peer, state, pindexWalk, count, nWindowEnd, &m_chainman.ActiveChain(), &nodeStaller);
1415 : : }
1416 : :
1417 : 0 : void PeerManagerImpl::TryDownloadingHistoricalBlocks(const Peer& peer, unsigned int count, std::vector<const CBlockIndex*>& vBlocks, const CBlockIndex *from_tip, const CBlockIndex* target_block)
1418 : : {
1419 : 0 : Assert(from_tip);
1420 : 0 : Assert(target_block);
1421 : :
1422 [ # # # # ]: 0 : if (vBlocks.size() >= count) {
1423 : : return;
1424 : : }
1425 : :
1426 : 0 : vBlocks.reserve(count);
1427 : 0 : CNodeState *state = Assert(State(peer.m_id));
1428 : :
1429 [ # # # # ]: 0 : if (state->pindexBestKnownBlock == nullptr || state->pindexBestKnownBlock->GetAncestor(target_block->nHeight) != target_block) {
1430 : : // This peer can't provide us the complete series of blocks leading up to the
1431 : : // assumeutxo snapshot base.
1432 : : //
1433 : : // Presumably this peer's chain has less work than our ActiveChain()'s tip, or else we
1434 : : // will eventually crash when we try to reorg to it. Let other logic
1435 : : // deal with whether we disconnect this peer.
1436 : : //
1437 : : // TODO at some point in the future, we might choose to request what blocks
1438 : : // this peer does have from the historical chain, despite it not having a
1439 : : // complete history beneath the snapshot base.
1440 : 0 : return;
1441 : : }
1442 : :
1443 [ # # ]: 0 : FindNextBlocks(vBlocks, peer, state, from_tip, count, std::min<int>(from_tip->nHeight + BLOCK_DOWNLOAD_WINDOW, target_block->nHeight));
1444 : : }
1445 : :
1446 : 0 : 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)
1447 : : {
1448 : 0 : std::vector<const CBlockIndex*> vToFetch;
1449 [ # # ]: 0 : int nMaxHeight = std::min<int>(state->pindexBestKnownBlock->nHeight, nWindowEnd + 1);
1450 : 0 : bool is_limited_peer = IsLimitedPeer(peer);
1451 : 0 : NodeId waitingfor = -1;
1452 [ # # ]: 0 : while (pindexWalk->nHeight < nMaxHeight) {
1453 : : // Read up to 128 (or more, if more blocks than that are needed) successors of pindexWalk (towards
1454 : : // pindexBestKnownBlock) into vToFetch. We fetch 128, because CBlockIndex::GetAncestor may be as expensive
1455 : : // as iterating over ~100 CBlockIndex* entries anyway.
1456 [ # # # # : 0 : int nToFetch = std::min(nMaxHeight - pindexWalk->nHeight, std::max<int>(count - vBlocks.size(), 128));
# # ]
1457 [ # # ]: 0 : vToFetch.resize(nToFetch);
1458 [ # # ]: 0 : pindexWalk = state->pindexBestKnownBlock->GetAncestor(pindexWalk->nHeight + nToFetch);
1459 : 0 : vToFetch[nToFetch - 1] = pindexWalk;
1460 [ # # ]: 0 : for (unsigned int i = nToFetch - 1; i > 0; i--) {
1461 : 0 : vToFetch[i - 1] = vToFetch[i]->pprev;
1462 : : }
1463 : :
1464 : : // Iterate over those blocks in vToFetch (in forward direction), adding the ones that
1465 : : // are not yet downloaded and not in flight to vBlocks. In the meantime, update
1466 : : // pindexLastCommonBlock as long as all ancestors are already downloaded, or if it's
1467 : : // already part of our chain (and therefore don't need it even if pruned).
1468 [ # # ]: 0 : for (const CBlockIndex* pindex : vToFetch) {
1469 [ # # # # ]: 0 : if (!pindex->IsValid(BLOCK_VALID_TREE)) {
1470 : : // We consider the chain that this peer is on invalid.
1471 : : return;
1472 : : }
1473 : :
1474 [ # # # # ]: 0 : if (!CanServeWitnesses(peer) && DeploymentActiveAt(*pindex, m_chainman, Consensus::DEPLOYMENT_SEGWIT)) {
1475 : : // We wouldn't download this block or its descendants from this peer.
1476 : : return;
1477 : : }
1478 : :
1479 [ # # # # : 0 : if (pindex->nStatus & BLOCK_HAVE_DATA || (activeChain && activeChain->Contains(pindex))) {
# # ]
1480 [ # # # # ]: 0 : if (activeChain && pindex->HaveNumChainTxs()) {
1481 : 0 : state->pindexLastCommonBlock = pindex;
1482 : : }
1483 : 0 : continue;
1484 : : }
1485 : :
1486 : : // Is block in-flight?
1487 [ # # ]: 0 : if (IsBlockRequested(pindex->GetBlockHash())) {
1488 [ # # ]: 0 : if (waitingfor == -1) {
1489 : : // This is the first already-in-flight block.
1490 : 0 : waitingfor = mapBlocksInFlight.lower_bound(pindex->GetBlockHash())->second.first;
1491 : : }
1492 : 0 : continue;
1493 : : }
1494 : :
1495 : : // The block is not already downloaded, and not yet in flight.
1496 [ # # ]: 0 : if (pindex->nHeight > nWindowEnd) {
1497 : : // We reached the end of the window.
1498 [ # # # # : 0 : if (vBlocks.size() == 0 && waitingfor != peer.m_id) {
# # ]
1499 : : // We aren't able to fetch anything, but we would be if the download window was one larger.
1500 [ # # ]: 0 : if (nodeStaller) *nodeStaller = waitingfor;
1501 : : }
1502 : 0 : return;
1503 : : }
1504 : :
1505 : : // Don't request blocks that go further than what limited peers can provide
1506 [ # # # # ]: 0 : if (is_limited_peer && (state->pindexBestKnownBlock->nHeight - pindex->nHeight >= static_cast<int>(NODE_NETWORK_LIMITED_MIN_BLOCKS) - 2 /* two blocks buffer for possible races */)) {
1507 : 0 : continue;
1508 : : }
1509 : :
1510 [ # # ]: 0 : vBlocks.push_back(pindex);
1511 [ # # # # ]: 0 : if (vBlocks.size() == count) {
1512 : : return;
1513 : : }
1514 : : }
1515 : : }
1516 : 0 : }
1517 : :
1518 : : } // namespace
1519 : :
1520 : 9311 : void PeerManagerImpl::PushNodeVersion(CNode& pnode, const Peer& peer)
1521 : : {
1522 : 9311 : uint64_t my_services{peer.m_our_services};
1523 : 9311 : const int64_t nTime{count_seconds(GetTime<std::chrono::seconds>())};
1524 : 9311 : uint64_t nonce = pnode.GetLocalNonce();
1525 : 9311 : const int nNodeStartingHeight{m_best_height};
1526 : 9311 : NodeId nodeid = pnode.GetId();
1527 : 9311 : CAddress addr = pnode.addr;
1528 : :
1529 [ + - + + : 13131 : CService addr_you = addr.IsRoutable() && !IsProxy(addr) && addr.IsAddrV1Compatible() ? addr : CService();
+ - + - +
- + + +
- ]
1530 : 9311 : uint64_t your_services{addr.nServices};
1531 : :
1532 : 9311 : const bool tx_relay{!RejectIncomingTxs(pnode)};
1533 [ + - ]: 18622 : MakeAndPushMessage(pnode, NetMsgType::VERSION, PROTOCOL_VERSION, my_services, nTime,
1534 : 9311 : your_services, CNetAddr::V1(addr_you), // Together the pre-version-31402 serialization of CAddress "addrYou" (without nTime)
1535 [ + - + - ]: 9311 : my_services, CNetAddr::V1(CService{}), // Together the pre-version-31402 serialization of CAddress "addrMe" (without nTime)
1536 : : nonce, strSubVersion, nNodeStartingHeight, tx_relay);
1537 : :
1538 [ - + ]: 9311 : if (fLogIPs) {
1539 [ # # # # : 0 : 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);
# # # # ]
1540 : : } else {
1541 [ + - - + : 9311 : LogDebug(BCLog::NET, "send version message: version %d, blocks=%d, txrelay=%d, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, tx_relay, nodeid);
- - ]
1542 : : }
1543 : 9311 : }
1544 : :
1545 : 0 : void PeerManagerImpl::UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds)
1546 : : {
1547 : 0 : LOCK(cs_main);
1548 : 0 : CNodeState *state = State(node);
1549 [ # # ]: 0 : if (state) state->m_last_block_announcement = time_in_seconds;
1550 : 0 : }
1551 : :
1552 : 9935 : void PeerManagerImpl::InitializeNode(const CNode& node, ServiceFlags our_services)
1553 : : {
1554 : 9935 : NodeId nodeid = node.GetId();
1555 : 9935 : {
1556 : 9935 : LOCK(cs_main); // For m_node_states
1557 [ + - ]: 9935 : m_node_states.try_emplace(m_node_states.end(), nodeid);
1558 : 0 : }
1559 [ + - ]: 29805 : WITH_LOCK(m_tx_download_mutex, m_txdownloadman.CheckIsEmpty(nodeid));
1560 : :
1561 [ + + ]: 9935 : if (NetPermissions::HasFlag(node.m_permission_flags, NetPermissionFlags::BloomFilter)) {
1562 : 2606 : our_services = static_cast<ServiceFlags>(our_services | NODE_BLOOM);
1563 : : }
1564 : :
1565 : 9935 : PeerRef peer = std::make_shared<Peer>(nodeid, our_services, node.IsInboundConn());
1566 : 9935 : {
1567 [ + - ]: 9935 : LOCK(m_peer_mutex);
1568 [ + - + - ]: 9935 : m_peer_map.emplace_hint(m_peer_map.end(), nodeid, peer);
1569 [ + - ]: 9935 : }
1570 : 9935 : }
1571 : :
1572 : 0 : void PeerManagerImpl::ReattemptInitialBroadcast(CScheduler& scheduler)
1573 : : {
1574 : 0 : std::set<Txid> unbroadcast_txids = m_mempool.GetUnbroadcastTxs();
1575 : :
1576 [ # # ]: 0 : for (const auto& txid : unbroadcast_txids) {
1577 [ # # ]: 0 : CTransactionRef tx = m_mempool.get(txid);
1578 : :
1579 [ # # ]: 0 : if (tx != nullptr) {
1580 [ # # ]: 0 : RelayTransaction(txid, tx->GetWitnessHash());
1581 : : } else {
1582 [ # # ]: 0 : m_mempool.RemoveUnbroadcastTx(txid, true);
1583 : : }
1584 : 0 : }
1585 : :
1586 : : // Schedule next run for 10-15 minutes in the future.
1587 : : // We add randomness on every cycle to avoid the possibility of P2P fingerprinting.
1588 : 0 : const auto delta = 10min + FastRandomContext().randrange<std::chrono::milliseconds>(5min);
1589 [ # # ]: 0 : scheduler.scheduleFromNow([&] { ReattemptInitialBroadcast(scheduler); }, delta);
1590 : 0 : }
1591 : :
1592 : 9935 : void PeerManagerImpl::FinalizeNode(const CNode& node)
1593 : : {
1594 : 9935 : NodeId nodeid = node.GetId();
1595 : 9935 : {
1596 : 9935 : LOCK(cs_main);
1597 : 9935 : {
1598 : : // We remove the PeerRef from g_peer_map here, but we don't always
1599 : : // destruct the Peer. Sometimes another thread is still holding a
1600 : : // PeerRef, so the refcount is >= 1. Be careful not to do any
1601 : : // processing here that assumes Peer won't be changed before it's
1602 : : // destructed.
1603 [ + - ]: 9935 : PeerRef peer = RemovePeer(nodeid);
1604 [ - + ]: 9935 : assert(peer != nullptr);
1605 [ - + ]: 9935 : m_wtxid_relay_peers -= peer->m_wtxid_relay;
1606 [ - + ]: 9935 : assert(m_wtxid_relay_peers >= 0);
1607 : 9935 : }
1608 : 9935 : CNodeState *state = State(nodeid);
1609 [ - + ]: 9935 : assert(state != nullptr);
1610 : :
1611 [ + + ]: 9935 : if (state->fSyncStarted)
1612 : 3242 : nSyncStarted--;
1613 : :
1614 [ + + ]: 10038 : for (const QueuedBlock& entry : state->vBlocksInFlight) {
1615 : 103 : auto range = mapBlocksInFlight.equal_range(entry.pindex->GetBlockHash());
1616 [ + + ]: 206 : while (range.first != range.second) {
1617 [ - + ]: 103 : auto [node_id, list_it] = range.first->second;
1618 [ - + ]: 103 : if (node_id != nodeid) {
1619 : 0 : range.first++;
1620 : : } else {
1621 : 103 : range.first = mapBlocksInFlight.erase(range.first);
1622 : : }
1623 : : }
1624 : : }
1625 : 9935 : {
1626 [ + - ]: 9935 : LOCK(m_tx_download_mutex);
1627 [ + - ]: 9935 : m_txdownloadman.DisconnectedPeer(nodeid);
1628 : 0 : }
1629 [ + + + - ]: 9935 : if (m_txreconciliation) m_txreconciliation->ForgetPeer(nodeid);
1630 : 9935 : m_num_preferred_download_peers -= state->fPreferredDownload;
1631 [ - + ]: 9935 : m_peers_downloading_from -= (!state->vBlocksInFlight.empty());
1632 [ - + ]: 9935 : assert(m_peers_downloading_from >= 0);
1633 : 9935 : m_outbound_peers_with_protect_from_disconnect -= state->m_chain_sync.m_protect;
1634 [ - + ]: 9935 : assert(m_outbound_peers_with_protect_from_disconnect >= 0);
1635 : :
1636 : 9935 : m_node_states.erase(nodeid);
1637 : :
1638 [ + + ]: 9935 : if (m_node_states.empty()) {
1639 : : // Do a consistency check after the last peer is removed.
1640 [ - + ]: 6254 : assert(mapBlocksInFlight.empty());
1641 [ - + ]: 6254 : assert(m_num_preferred_download_peers == 0);
1642 [ - + ]: 6254 : assert(m_peers_downloading_from == 0);
1643 [ - + ]: 6254 : assert(m_outbound_peers_with_protect_from_disconnect == 0);
1644 [ - + ]: 6254 : assert(m_wtxid_relay_peers == 0);
1645 [ + - + - ]: 18762 : WITH_LOCK(m_tx_download_mutex, m_txdownloadman.CheckIsEmpty());
1646 : : }
1647 : 9935 : } // cs_main
1648 [ + + ]: 9935 : if (node.fSuccessfullyConnected &&
1649 [ + + + + : 9935 : !node.IsBlockOnlyConn() && !node.IsInboundConn()) {
+ + ]
1650 : : // Only change visible addrman state for full outbound peers. We don't
1651 : : // call Connected() for feeler connections since they don't have
1652 : : // fSuccessfullyConnected set.
1653 : 2958 : m_addrman.Connected(node.addr);
1654 : : }
1655 : 9935 : {
1656 : 9935 : LOCK(m_headers_presync_mutex);
1657 [ + - ]: 9935 : m_headers_presync_stats.erase(nodeid);
1658 : 9935 : }
1659 [ - + ]: 9935 : LogDebug(BCLog::NET, "Cleared nodestate for peer=%d\n", nodeid);
1660 : 9935 : }
1661 : :
1662 : 46736 : bool PeerManagerImpl::HasAllDesirableServiceFlags(ServiceFlags services) const
1663 : : {
1664 : : // Shortcut for (services & GetDesirableServiceFlags(services)) == GetDesirableServiceFlags(services)
1665 : 46736 : return !(GetDesirableServiceFlags(services) & (~services));
1666 : : }
1667 : :
1668 : 46736 : ServiceFlags PeerManagerImpl::GetDesirableServiceFlags(ServiceFlags services) const
1669 : : {
1670 [ + + ]: 46736 : if (services & NODE_NETWORK_LIMITED) {
1671 : : // Limited peers are desirable when we are close to the tip.
1672 [ - + ]: 2758 : if (ApproximateBestBlockDepth() < NODE_NETWORK_LIMITED_ALLOW_CONN_BLOCKS) {
1673 : 0 : return ServiceFlags(NODE_NETWORK_LIMITED | NODE_WITNESS);
1674 : : }
1675 : : }
1676 : : return ServiceFlags(NODE_NETWORK | NODE_WITNESS);
1677 : : }
1678 : :
1679 : 1343860 : PeerRef PeerManagerImpl::GetPeerRef(NodeId id) const
1680 : : {
1681 : 1343860 : LOCK(m_peer_mutex);
1682 : 1343860 : auto it = m_peer_map.find(id);
1683 [ + + + - : 2108854 : return it != m_peer_map.end() ? it->second : nullptr;
+ - ]
1684 : 1343860 : }
1685 : :
1686 : 9935 : PeerRef PeerManagerImpl::RemovePeer(NodeId id)
1687 : : {
1688 : 9935 : PeerRef ret;
1689 [ + - ]: 9935 : LOCK(m_peer_mutex);
1690 : 9935 : auto it = m_peer_map.find(id);
1691 [ + - ]: 9935 : if (it != m_peer_map.end()) {
1692 : 9935 : ret = std::move(it->second);
1693 : 9935 : m_peer_map.erase(it);
1694 : : }
1695 [ + - ]: 9935 : return ret;
1696 : 9935 : }
1697 : :
1698 : 6973 : bool PeerManagerImpl::GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const
1699 : : {
1700 : 6973 : {
1701 : 6973 : LOCK(cs_main);
1702 : 6973 : const CNodeState* state = State(nodeid);
1703 [ - + ]: 6973 : if (state == nullptr)
1704 [ # # ]: 0 : return false;
1705 [ - + ]: 6973 : stats.nSyncHeight = state->pindexBestKnownBlock ? state->pindexBestKnownBlock->nHeight : -1;
1706 [ - + ]: 6973 : stats.nCommonHeight = state->pindexLastCommonBlock ? state->pindexLastCommonBlock->nHeight : -1;
1707 [ - + ]: 6973 : for (const QueuedBlock& queue : state->vBlocksInFlight) {
1708 [ # # ]: 0 : if (queue.pindex)
1709 [ # # ]: 0 : stats.vHeightInFlight.push_back(queue.pindex->nHeight);
1710 : : }
1711 : 0 : }
1712 : :
1713 : 6973 : PeerRef peer = GetPeerRef(nodeid);
1714 [ + - ]: 6973 : if (peer == nullptr) return false;
1715 [ - + ]: 6973 : stats.their_services = peer->m_their_services;
1716 [ - + ]: 6973 : stats.m_starting_height = peer->m_starting_height;
1717 : : // It is common for nodes with good ping times to suddenly become lagged,
1718 : : // due to a new block arriving or other large transfer.
1719 : : // Merely reporting pingtime might fool the caller into thinking the node was still responsive,
1720 : : // since pingtime does not update until the ping is complete, which might take a while.
1721 : : // So, if a ping is taking an unusually long time in flight,
1722 : : // the caller can immediately detect that this is happening.
1723 : 6973 : auto ping_wait{0us};
1724 [ - + - - ]: 6973 : if ((0 != peer->m_ping_nonce_sent) && (0 != peer->m_ping_start.load().count())) {
1725 : 0 : ping_wait = GetTime<std::chrono::microseconds>() - peer->m_ping_start.load();
1726 : : }
1727 : :
1728 [ + - + + ]: 6973 : if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
1729 [ + - + - ]: 10970 : stats.m_relay_txs = WITH_LOCK(tx_relay->m_bloom_filter_mutex, return tx_relay->m_relay_txs);
1730 : 5485 : stats.m_fee_filter_received = tx_relay->m_fee_filter_received.load();
1731 : : } else {
1732 : 1488 : stats.m_relay_txs = false;
1733 : 1488 : stats.m_fee_filter_received = 0;
1734 : : }
1735 : :
1736 : 6973 : stats.m_ping_wait = ping_wait;
1737 [ + - ]: 6973 : stats.m_addr_processed = peer->m_addr_processed.load();
1738 : 6973 : stats.m_addr_rate_limited = peer->m_addr_rate_limited.load();
1739 [ + - ]: 6973 : stats.m_addr_relay_enabled = peer->m_addr_relay_enabled.load();
1740 : 6973 : {
1741 [ + - ]: 6973 : LOCK(peer->m_headers_sync_mutex);
1742 [ - + ]: 6973 : if (peer->m_headers_sync) {
1743 : 0 : stats.presync_height = peer->m_headers_sync->GetPresyncHeight();
1744 : : }
1745 : 6973 : }
1746 : 6973 : stats.time_offset = peer->m_time_offset;
1747 : :
1748 : 6973 : return true;
1749 : 6973 : }
1750 : :
1751 : 7 : std::vector<node::TxOrphanage::OrphanInfo> PeerManagerImpl::GetOrphanTransactions()
1752 : : {
1753 : 7 : LOCK(m_tx_download_mutex);
1754 [ + - ]: 7 : return m_txdownloadman.GetOrphanTransactions();
1755 : 7 : }
1756 : :
1757 : 1 : PeerManagerInfo PeerManagerImpl::GetInfo() const
1758 : : {
1759 : 1 : return PeerManagerInfo{
1760 : 1 : .median_outbound_time_offset = m_outbound_time_offsets.Median(),
1761 : 1 : .ignores_incoming_txs = m_opts.ignore_incoming_txs,
1762 : 1 : };
1763 : : }
1764 : :
1765 : 4370 : void PeerManagerImpl::AddToCompactExtraTransactions(const CTransactionRef& tx)
1766 : : {
1767 [ + - ]: 4370 : if (m_opts.max_extra_txs <= 0)
1768 : : return;
1769 [ - + + + ]: 4370 : if (!vExtraTxnForCompact.size())
1770 : 1121 : vExtraTxnForCompact.resize(m_opts.max_extra_txs);
1771 [ - + ]: 4370 : vExtraTxnForCompact[vExtraTxnForCompactIt] = std::make_pair(tx->GetWitnessHash(), tx);
1772 : 4370 : vExtraTxnForCompactIt = (vExtraTxnForCompactIt + 1) % m_opts.max_extra_txs;
1773 : : }
1774 : :
1775 : 1888 : void PeerManagerImpl::Misbehaving(Peer& peer, const std::string& message)
1776 : : {
1777 : 1888 : LOCK(peer.m_misbehavior_mutex);
1778 : :
1779 [ - + - - : 1888 : const std::string message_prefixed = message.empty() ? "" : (": " + message);
+ - ]
1780 : 1888 : peer.m_should_discourage = true;
1781 [ + - - + : 1888 : LogDebug(BCLog::NET, "Misbehaving: peer=%d%s\n", peer.m_id, message_prefixed);
- - ]
1782 : : TRACEPOINT(net, misbehaving_connection,
1783 : : peer.m_id,
1784 : : message.c_str()
1785 : 1888 : );
1786 [ + - ]: 3776 : }
1787 : :
1788 : 949 : void PeerManagerImpl::MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& state,
1789 : : bool via_compact_block, const std::string& message)
1790 : : {
1791 : 949 : PeerRef peer{GetPeerRef(nodeid)};
1792 [ - - + - : 949 : switch (state.GetResult()) {
+ ]
1793 : : case BlockValidationResult::BLOCK_RESULT_UNSET:
1794 : : break;
1795 : : case BlockValidationResult::BLOCK_HEADER_LOW_WORK:
1796 : : // We didn't try to process the block because the header chain may have
1797 : : // too little work.
1798 : : break;
1799 : : // The node is providing invalid data:
1800 : 0 : case BlockValidationResult::BLOCK_CONSENSUS:
1801 : 0 : case BlockValidationResult::BLOCK_MUTATED:
1802 [ # # ]: 0 : if (!via_compact_block) {
1803 [ # # # # ]: 0 : if (peer) Misbehaving(*peer, message);
1804 : 0 : return;
1805 : : }
1806 : : break;
1807 : 0 : case BlockValidationResult::BLOCK_CACHED_INVALID:
1808 : 0 : {
1809 : : // Discourage outbound (but not inbound) peers if on an invalid chain.
1810 : : // Exempt HB compact block peers. Manual connections are always protected from discouragement.
1811 [ # # # # : 0 : if (peer && !via_compact_block && !peer->m_is_inbound) {
# # ]
1812 [ # # ]: 0 : if (peer) Misbehaving(*peer, message);
1813 : : return;
1814 : : }
1815 : : break;
1816 : : }
1817 : 812 : case BlockValidationResult::BLOCK_INVALID_HEADER:
1818 : 812 : case BlockValidationResult::BLOCK_INVALID_PREV:
1819 [ + - + - ]: 812 : if (peer) Misbehaving(*peer, message);
1820 : : return;
1821 : : // Conflicting (but not necessarily invalid) data or different policy:
1822 : 0 : case BlockValidationResult::BLOCK_MISSING_PREV:
1823 [ # # # # ]: 0 : if (peer) Misbehaving(*peer, message);
1824 : : return;
1825 : : case BlockValidationResult::BLOCK_TIME_FUTURE:
1826 : : break;
1827 : : }
1828 [ + - ]: 137 : if (message != "") {
1829 [ + - - + : 137 : LogDebug(BCLog::NET, "peer=%d: %s\n", nodeid, message);
- - ]
1830 : : }
1831 : 949 : }
1832 : :
1833 : 3094 : bool PeerManagerImpl::BlockRequestAllowed(const CBlockIndex* pindex)
1834 : : {
1835 : 3094 : AssertLockHeld(cs_main);
1836 [ - + ]: 3094 : if (m_chainman.ActiveChain().Contains(pindex)) return true;
1837 [ # # # # : 0 : return pindex->IsValid(BLOCK_VALID_SCRIPTS) && (m_chainman.m_best_header != nullptr) &&
# # ]
1838 [ # # # # : 0 : (m_chainman.m_best_header->GetBlockTime() - pindex->GetBlockTime() < STALE_RELAY_AGE_LIMIT) &&
# # ]
1839 : 0 : (GetBlockProofEquivalentTime(*m_chainman.m_best_header, *pindex, *m_chainman.m_best_header, m_chainparams.GetConsensus()) < STALE_RELAY_AGE_LIMIT);
1840 : : }
1841 : :
1842 : 0 : std::optional<std::string> PeerManagerImpl::FetchBlock(NodeId peer_id, const CBlockIndex& block_index)
1843 : : {
1844 [ # # ]: 0 : if (m_chainman.m_blockman.LoadingBlocks()) return "Loading blocks ...";
1845 : :
1846 : : // Ensure this peer exists and hasn't been disconnected
1847 : 0 : PeerRef peer = GetPeerRef(peer_id);
1848 [ # # # # ]: 0 : if (peer == nullptr) return "Peer does not exist";
1849 : :
1850 : : // Ignore pre-segwit peers
1851 [ # # # # ]: 0 : if (!CanServeWitnesses(*peer)) return "Pre-SegWit peer";
1852 : :
1853 [ # # ]: 0 : LOCK(cs_main);
1854 : :
1855 : : // Forget about all prior requests
1856 [ # # ]: 0 : RemoveBlockRequest(block_index.GetBlockHash(), std::nullopt);
1857 : :
1858 : : // Mark block as in-flight
1859 [ # # # # : 0 : if (!BlockRequested(peer_id, block_index)) return "Already requested from this peer";
# # ]
1860 : :
1861 : : // Construct message to request the block
1862 : 0 : const uint256& hash{block_index.GetBlockHash()};
1863 [ # # # # ]: 0 : std::vector<CInv> invs{CInv(MSG_BLOCK | MSG_WITNESS_FLAG, hash)};
1864 : :
1865 : : // Send block request message to the peer
1866 [ # # ]: 0 : bool success = m_connman.ForNode(peer_id, [this, &invs](CNode* node) {
1867 [ # # ]: 0 : this->MakeAndPushMessage(*node, NetMsgType::GETDATA, invs);
1868 : 0 : return true;
1869 : : });
1870 : :
1871 [ # # # # ]: 0 : if (!success) return "Peer not fully connected";
1872 : :
1873 [ # # # # : 0 : LogDebug(BCLog::NET, "Requesting block %s from peer=%d\n",
# # # # ]
1874 : : hash.ToString(), peer_id);
1875 : 0 : return std::nullopt;
1876 : 0 : }
1877 : :
1878 : 5817 : std::unique_ptr<PeerManager> PeerManager::make(CConnman& connman, AddrMan& addrman,
1879 : : BanMan* banman, ChainstateManager& chainman,
1880 : : CTxMemPool& pool, node::Warnings& warnings, Options opts)
1881 : : {
1882 [ - + ]: 5817 : return std::make_unique<PeerManagerImpl>(connman, addrman, banman, chainman, pool, warnings, opts);
1883 : : }
1884 : :
1885 : 5817 : PeerManagerImpl::PeerManagerImpl(CConnman& connman, AddrMan& addrman,
1886 : : BanMan* banman, ChainstateManager& chainman,
1887 : 5817 : CTxMemPool& pool, node::Warnings& warnings, Options opts)
1888 : 5817 : : m_rng{opts.deterministic_rng},
1889 [ + - ]: 5817 : m_fee_filter_rounder{CFeeRate{DEFAULT_MIN_RELAY_TX_FEE}, m_rng},
1890 : 5817 : m_chainparams(chainman.GetParams()),
1891 : 5817 : m_connman(connman),
1892 : 5817 : m_addrman(addrman),
1893 : 5817 : m_banman(banman),
1894 : 5817 : m_chainman(chainman),
1895 : 5817 : m_mempool(pool),
1896 [ + - ]: 5817 : m_txdownloadman(node::TxDownloadOptions{pool, m_rng, opts.deterministic_rng}),
1897 [ + - ]: 5817 : m_warnings{warnings},
1898 [ + - + - : 11634 : m_opts{opts}
+ + ]
1899 : : {
1900 : : // While Erlay support is incomplete, it must be enabled explicitly via -txreconciliation.
1901 : : // This argument can go away after Erlay support is complete.
1902 [ + + ]: 5817 : if (opts.reconcile_txs) {
1903 [ + - ]: 5793 : m_txreconciliation = std::make_unique<TxReconciliationTracker>(TXRECONCILIATION_VERSION);
1904 : : }
1905 [ - - - - ]: 5817 : }
1906 : :
1907 : 0 : void PeerManagerImpl::StartScheduledTasks(CScheduler& scheduler)
1908 : : {
1909 : : // Stale tip checking and peer eviction are on two different timers, but we
1910 : : // don't want them to get out of sync due to drift in the scheduler, so we
1911 : : // combine them in one function and schedule at the quicker (peer-eviction)
1912 : : // timer.
1913 : 0 : static_assert(EXTRA_PEER_CHECK_INTERVAL < STALE_CHECK_INTERVAL, "peer eviction timer should be less than stale tip check timer");
1914 [ # # ]: 0 : scheduler.scheduleEvery([this] { this->CheckForStaleTipAndEvictPeers(); }, std::chrono::seconds{EXTRA_PEER_CHECK_INTERVAL});
1915 : :
1916 : : // schedule next run for 10-15 minutes in the future
1917 : 0 : const auto delta = 10min + FastRandomContext().randrange<std::chrono::milliseconds>(5min);
1918 [ # # ]: 0 : scheduler.scheduleFromNow([&] { ReattemptInitialBroadcast(scheduler); }, delta);
1919 : 0 : }
1920 : :
1921 : 0 : void PeerManagerImpl::ActiveTipChange(const CBlockIndex& new_tip, bool is_ibd)
1922 : : {
1923 : : // Ensure mempool mutex was released, otherwise deadlock may occur if another thread holding
1924 : : // m_tx_download_mutex waits on the mempool mutex.
1925 : 0 : AssertLockNotHeld(m_mempool.cs);
1926 : 0 : AssertLockNotHeld(m_tx_download_mutex);
1927 : :
1928 [ # # ]: 0 : if (!is_ibd) {
1929 : 0 : LOCK(m_tx_download_mutex);
1930 : : // If the chain tip has changed, previously rejected transactions might now be valid, e.g. due
1931 : : // to a timelock. Reset the rejection filters to give those transactions another chance if we
1932 : : // see them again.
1933 [ # # ]: 0 : m_txdownloadman.ActiveTipChange();
1934 : 0 : }
1935 : 0 : }
1936 : :
1937 : : /**
1938 : : * Evict orphan txn pool entries based on a newly connected
1939 : : * block, remember the recently confirmed transactions, and delete tracked
1940 : : * announcements for them. Also save the time of the last tip update and
1941 : : * possibly reduce dynamic block stalling timeout.
1942 : : */
1943 : 0 : void PeerManagerImpl::BlockConnected(
1944 : : ChainstateRole role,
1945 : : const std::shared_ptr<const CBlock>& pblock,
1946 : : const CBlockIndex* pindex)
1947 : : {
1948 : : // Update this for all chainstate roles so that we don't mistakenly see peers
1949 : : // helping us do background IBD as having a stale tip.
1950 : 0 : m_last_tip_update = GetTime<std::chrono::seconds>();
1951 : :
1952 : : // In case the dynamic timeout was doubled once or more, reduce it slowly back to its default value
1953 : 0 : auto stalling_timeout = m_block_stalling_timeout.load();
1954 : 0 : Assume(stalling_timeout >= BLOCK_STALLING_TIMEOUT_DEFAULT);
1955 [ # # ]: 0 : if (stalling_timeout != BLOCK_STALLING_TIMEOUT_DEFAULT) {
1956 : 0 : const auto new_timeout = std::max(std::chrono::duration_cast<std::chrono::seconds>(stalling_timeout * 0.85), BLOCK_STALLING_TIMEOUT_DEFAULT);
1957 [ # # ]: 0 : if (m_block_stalling_timeout.compare_exchange_strong(stalling_timeout, new_timeout)) {
1958 [ # # ]: 0 : LogDebug(BCLog::NET, "Decreased stalling timeout to %d seconds\n", count_seconds(new_timeout));
1959 : : }
1960 : : }
1961 : :
1962 : : // The following task can be skipped since we don't maintain a mempool for
1963 : : // the ibd/background chainstate.
1964 [ # # ]: 0 : if (role == ChainstateRole::BACKGROUND) {
1965 : : return;
1966 : : }
1967 : 0 : LOCK(m_tx_download_mutex);
1968 [ # # ]: 0 : m_txdownloadman.BlockConnected(pblock);
1969 : 0 : }
1970 : :
1971 : 0 : void PeerManagerImpl::BlockDisconnected(const std::shared_ptr<const CBlock> &block, const CBlockIndex* pindex)
1972 : : {
1973 : 0 : LOCK(m_tx_download_mutex);
1974 [ # # ]: 0 : m_txdownloadman.BlockDisconnected();
1975 : 0 : }
1976 : :
1977 : : /**
1978 : : * Maintain state about the best-seen block and fast-announce a compact block
1979 : : * to compatible peers.
1980 : : */
1981 : 0 : void PeerManagerImpl::NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock)
1982 : : {
1983 [ # # ]: 0 : auto pcmpctblock = std::make_shared<const CBlockHeaderAndShortTxIDs>(*pblock, FastRandomContext().rand64());
1984 : :
1985 [ # # ]: 0 : LOCK(cs_main);
1986 : :
1987 [ # # ]: 0 : if (pindex->nHeight <= m_highest_fast_announce)
1988 : : return;
1989 : 0 : m_highest_fast_announce = pindex->nHeight;
1990 : :
1991 [ # # ]: 0 : if (!DeploymentActiveAt(*pindex, m_chainman, Consensus::DEPLOYMENT_SEGWIT)) return;
1992 : :
1993 [ # # ]: 0 : uint256 hashBlock(pblock->GetHash());
1994 : 0 : const std::shared_future<CSerializedNetMsg> lazy_ser{
1995 [ # # # # : 0 : std::async(std::launch::deferred, [&] { return NetMsg::Make(NetMsgType::CMPCTBLOCK, *pcmpctblock); })};
# # ]
1996 : :
1997 : 0 : {
1998 [ # # ]: 0 : auto most_recent_block_txs = std::make_unique<std::map<GenTxid, CTransactionRef>>();
1999 [ # # ]: 0 : for (const auto& tx : pblock->vtx) {
2000 [ # # ]: 0 : most_recent_block_txs->emplace(tx->GetHash(), tx);
2001 [ # # ]: 0 : most_recent_block_txs->emplace(tx->GetWitnessHash(), tx);
2002 : : }
2003 : :
2004 [ # # ]: 0 : LOCK(m_most_recent_block_mutex);
2005 : 0 : m_most_recent_block_hash = hashBlock;
2006 : 0 : m_most_recent_block = pblock;
2007 : 0 : m_most_recent_compact_block = pcmpctblock;
2008 [ # # ]: 0 : m_most_recent_block_txs = std::move(most_recent_block_txs);
2009 : 0 : }
2010 : :
2011 [ # # # # : 0 : m_connman.ForEachNode([this, pindex, &lazy_ser, &hashBlock](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
# # ]
2012 : 0 : AssertLockHeld(::cs_main);
2013 : :
2014 [ # # # # ]: 0 : if (pnode->GetCommonVersion() < INVALID_CB_NO_BAN_VERSION || pnode->fDisconnect)
2015 : 0 : return;
2016 : 0 : ProcessBlockAvailability(pnode->GetId());
2017 : 0 : CNodeState &state = *State(pnode->GetId());
2018 : : // If the peer has, or we announced to them the previous block already,
2019 : : // but we don't think they have this one, go ahead and announce it
2020 [ # # # # : 0 : if (state.m_requested_hb_cmpctblocks && !PeerHasHeader(&state, pindex) && PeerHasHeader(&state, pindex->pprev)) {
# # ]
2021 : :
2022 [ # # # # ]: 0 : LogDebug(BCLog::NET, "%s sending header-and-ids %s to peer=%d\n", "PeerManager::NewPoWValidBlock",
2023 : : hashBlock.ToString(), pnode->GetId());
2024 : :
2025 : 0 : const CSerializedNetMsg& ser_cmpctblock{lazy_ser.get()};
2026 [ # # ]: 0 : PushMessage(*pnode, ser_cmpctblock.Copy());
2027 : 0 : state.pindexBestHeaderSent = pindex;
2028 : : }
2029 : : });
2030 [ # # # # : 0 : }
# # ]
2031 : :
2032 : : /**
2033 : : * Update our best height and announce any block hashes which weren't previously
2034 : : * in m_chainman.ActiveChain() to our peers.
2035 : : */
2036 : 0 : void PeerManagerImpl::UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload)
2037 : : {
2038 : 0 : SetBestBlock(pindexNew->nHeight, std::chrono::seconds{pindexNew->GetBlockTime()});
2039 : :
2040 : : // Don't relay inventory during initial block download.
2041 [ # # ]: 0 : if (fInitialDownload) return;
2042 : :
2043 : : // Find the hashes of all blocks that weren't previously in the best chain.
2044 : 0 : std::vector<uint256> vHashes;
2045 : 0 : const CBlockIndex *pindexToAnnounce = pindexNew;
2046 [ # # ]: 0 : while (pindexToAnnounce != pindexFork) {
2047 [ # # ]: 0 : vHashes.push_back(pindexToAnnounce->GetBlockHash());
2048 : 0 : pindexToAnnounce = pindexToAnnounce->pprev;
2049 [ # # # # ]: 0 : if (vHashes.size() == MAX_BLOCKS_TO_ANNOUNCE) {
2050 : : // Limit announcements in case of a huge reorganization.
2051 : : // Rely on the peer's synchronization mechanism in that case.
2052 : : break;
2053 : : }
2054 : : }
2055 : :
2056 : 0 : {
2057 [ # # ]: 0 : LOCK(m_peer_mutex);
2058 [ # # ]: 0 : for (auto& it : m_peer_map) {
2059 [ # # ]: 0 : Peer& peer = *it.second;
2060 [ # # ]: 0 : LOCK(peer.m_block_inv_mutex);
2061 [ # # ]: 0 : for (const uint256& hash : vHashes | std::views::reverse) {
2062 [ # # ]: 0 : peer.m_blocks_for_headers_relay.push_back(hash);
2063 : : }
2064 : 0 : }
2065 : 0 : }
2066 : :
2067 [ # # ]: 0 : m_connman.WakeMessageHandler();
2068 : 0 : }
2069 : :
2070 : : /**
2071 : : * Handle invalid block rejection and consequent peer discouragement, maintain which
2072 : : * peers announce compact blocks.
2073 : : */
2074 : 0 : void PeerManagerImpl::BlockChecked(const std::shared_ptr<const CBlock>& block, const BlockValidationState& state)
2075 : : {
2076 : 0 : LOCK(cs_main);
2077 : :
2078 [ # # ]: 0 : const uint256 hash(block->GetHash());
2079 : 0 : std::map<uint256, std::pair<NodeId, bool>>::iterator it = mapBlockSource.find(hash);
2080 : :
2081 : : // If the block failed validation, we know where it came from and we're still connected
2082 : : // to that peer, maybe punish.
2083 [ # # # # ]: 0 : if (state.IsInvalid() &&
2084 [ # # # # : 0 : it != mapBlockSource.end() &&
# # ]
2085 : 0 : State(it->second.first)) {
2086 [ # # # # ]: 0 : MaybePunishNodeForBlock(/*nodeid=*/ it->second.first, state, /*via_compact_block=*/ !it->second.second);
2087 : : }
2088 : : // Check that:
2089 : : // 1. The block is valid
2090 : : // 2. We're not in initial block download
2091 : : // 3. This is currently the best block we're aware of. We haven't updated
2092 : : // the tip yet so we have no way to check this directly here. Instead we
2093 : : // just check that there are currently no other blocks in flight.
2094 [ # # ]: 0 : else if (state.IsValid() &&
2095 [ # # # # : 0 : !m_chainman.IsInitialBlockDownload() &&
# # ]
2096 [ # # ]: 0 : mapBlocksInFlight.count(hash) == mapBlocksInFlight.size()) {
2097 [ # # ]: 0 : if (it != mapBlockSource.end()) {
2098 [ # # ]: 0 : MaybeSetPeerAsAnnouncingHeaderAndIDs(it->second.first);
2099 : : }
2100 : : }
2101 [ # # ]: 0 : if (it != mapBlockSource.end())
2102 : 0 : mapBlockSource.erase(it);
2103 : 0 : }
2104 : :
2105 : : //////////////////////////////////////////////////////////////////////////////
2106 : : //
2107 : : // Messages
2108 : : //
2109 : :
2110 : 2971 : bool PeerManagerImpl::AlreadyHaveBlock(const uint256& block_hash)
2111 : : {
2112 : 2971 : return m_chainman.m_blockman.LookupBlockIndex(block_hash) != nullptr;
2113 : : }
2114 : :
2115 : 2 : void PeerManagerImpl::SendPings()
2116 : : {
2117 : 2 : LOCK(m_peer_mutex);
2118 [ - + ]: 2 : for(auto& it : m_peer_map) it.second->m_ping_queued = true;
2119 : 2 : }
2120 : :
2121 : 0 : void PeerManagerImpl::RelayTransaction(const Txid& txid, const Wtxid& wtxid)
2122 : : {
2123 : 0 : LOCK(m_peer_mutex);
2124 [ # # ]: 0 : for(auto& it : m_peer_map) {
2125 [ # # ]: 0 : Peer& peer = *it.second;
2126 [ # # ]: 0 : auto tx_relay = peer.GetTxRelay();
2127 [ # # ]: 0 : if (!tx_relay) continue;
2128 : :
2129 [ # # ]: 0 : LOCK(tx_relay->m_tx_inventory_mutex);
2130 : : // Only queue transactions for announcement once the version handshake
2131 : : // is completed. The time of arrival for these transactions is
2132 : : // otherwise at risk of leaking to a spy, if the spy is able to
2133 : : // distinguish transactions received during the handshake from the rest
2134 : : // in the announcement.
2135 [ # # # # ]: 0 : if (tx_relay->m_next_inv_send_time == 0s) continue;
2136 : :
2137 [ # # ]: 0 : const uint256& hash{peer.m_wtxid_relay ? wtxid.ToUint256() : txid.ToUint256()};
2138 [ # # # # ]: 0 : if (!tx_relay->m_tx_inventory_known_filter.contains(hash)) {
2139 [ # # ]: 0 : tx_relay->m_tx_inventory_to_send.insert(wtxid);
2140 : : }
2141 : 0 : }
2142 : 0 : }
2143 : :
2144 : 372 : void PeerManagerImpl::RelayAddress(NodeId originator,
2145 : : const CAddress& addr,
2146 : : bool fReachable)
2147 : : {
2148 : : // We choose the same nodes within a given 24h window (if the list of connected
2149 : : // nodes does not change) and we don't relay to nodes that already know an
2150 : : // address. So within 24h we will likely relay a given address once. This is to
2151 : : // prevent a peer from unjustly giving their address better propagation by sending
2152 : : // it to us repeatedly.
2153 : :
2154 [ - + - - ]: 372 : if (!fReachable && !addr.IsRelayable()) return;
2155 : :
2156 : : // Relay to a limited number of other nodes
2157 : : // Use deterministic randomness to send to the same nodes for 24 hours
2158 : : // at a time so the m_addr_knowns of the chosen nodes prevent repeats
2159 : 372 : const uint64_t hash_addr{CServiceHash(0, 0)(addr)};
2160 : 372 : const auto current_time{GetTime<std::chrono::seconds>()};
2161 : : // Adding address hash makes exact rotation time different per address, while preserving periodicity.
2162 : 372 : const uint64_t time_addr{(static_cast<uint64_t>(count_seconds(current_time)) + hash_addr) / count_seconds(ROTATE_ADDR_RELAY_DEST_INTERVAL)};
2163 : 372 : const CSipHasher hasher{m_connman.GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY)
2164 : 372 : .Write(hash_addr)
2165 : 372 : .Write(time_addr)};
2166 : :
2167 : : // Relay reachable addresses to 2 peers. Unreachable addresses are relayed randomly to 1 or 2 peers.
2168 [ - + - - ]: 372 : unsigned int nRelayNodes = (fReachable || (hasher.Finalize() & 1)) ? 2 : 1;
2169 : :
2170 : 372 : std::array<std::pair<uint64_t, Peer*>, 2> best{{{0, nullptr}, {0, nullptr}}};
2171 [ - + ]: 372 : assert(nRelayNodes <= best.size());
2172 : :
2173 : 372 : LOCK(m_peer_mutex);
2174 : :
2175 [ + + + + ]: 1448 : for (auto& [id, peer] : m_peer_map) {
2176 [ + + + + : 1076 : if (peer->m_addr_relay_enabled && id != originator && IsAddrCompatible(*peer, addr)) {
+ - + - ]
2177 [ + - + - ]: 613 : uint64_t hashKey = CSipHasher(hasher).Write(id).Finalize();
2178 [ + - ]: 671 : for (unsigned int i = 0; i < nRelayNodes; i++) {
2179 [ + + ]: 671 : if (hashKey > best[i].first) {
2180 : 613 : std::copy(best.begin() + i, best.begin() + nRelayNodes - 1, best.begin() + i + 1);
2181 : 613 : best[i] = std::make_pair(hashKey, peer.get());
2182 : 613 : break;
2183 : : }
2184 : : }
2185 : : }
2186 : : };
2187 : :
2188 [ + + + + ]: 985 : for (unsigned int i = 0; i < nRelayNodes && best[i].first != 0; i++) {
2189 [ + - ]: 613 : PushAddress(*best[i].second, addr);
2190 : : }
2191 : 372 : }
2192 : :
2193 : 13723 : void PeerManagerImpl::ProcessGetBlockData(CNode& pfrom, Peer& peer, const CInv& inv)
2194 : : {
2195 : 13723 : std::shared_ptr<const CBlock> a_recent_block;
2196 : 13723 : std::shared_ptr<const CBlockHeaderAndShortTxIDs> a_recent_compact_block;
2197 : 13723 : {
2198 [ + - ]: 13723 : LOCK(m_most_recent_block_mutex);
2199 : 13723 : a_recent_block = m_most_recent_block;
2200 [ + - ]: 13723 : a_recent_compact_block = m_most_recent_compact_block;
2201 : 13723 : }
2202 : :
2203 : 13723 : bool need_activate_chain = false;
2204 : 13723 : {
2205 [ + - ]: 13723 : LOCK(cs_main);
2206 [ + - ]: 13723 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(inv.hash);
2207 [ + + ]: 13723 : if (pindex) {
2208 [ + - + + : 6062 : if (pindex->HaveNumChainTxs() && !pindex->IsValid(BLOCK_VALID_SCRIPTS) &&
+ - ]
2209 [ - + + - ]: 13723 : pindex->IsValid(BLOCK_VALID_TREE)) {
2210 : : // If we have the block and all of its parents, but have not yet validated it,
2211 : : // we might be in the middle of connecting it (ie in the unlock of cs_main
2212 : : // before ActivateBestChain but after AcceptBlock).
2213 : : // In this case, we need to run ActivateBestChain prior to checking the relay
2214 : : // conditions below.
2215 : : need_activate_chain = true;
2216 : : }
2217 : : }
2218 : 0 : } // release cs_main before calling ActivateBestChain
2219 [ + + ]: 13723 : if (need_activate_chain) {
2220 [ + - ]: 2798 : BlockValidationState state;
2221 [ + - - + : 2798 : if (!m_chainman.ActiveChainstate().ActivateBestChain(state, a_recent_block)) {
+ - - + -
+ ]
2222 [ # # # # : 0 : LogDebug(BCLog::NET, "failed to activate chain (%s)\n", state.ToString());
# # # # ]
2223 : : }
2224 : 2798 : }
2225 : :
2226 : 13723 : const CBlockIndex* pindex{nullptr};
2227 : 13723 : const CBlockIndex* tip{nullptr};
2228 : 13723 : bool can_direct_fetch{false};
2229 : 13723 : FlatFilePos block_pos{};
2230 : 13723 : {
2231 [ + - ]: 13723 : LOCK(cs_main);
2232 [ + - ]: 13723 : pindex = m_chainman.m_blockman.LookupBlockIndex(inv.hash);
2233 [ + + ]: 13723 : if (!pindex) {
2234 : : return;
2235 : : }
2236 [ + - - + ]: 3031 : if (!BlockRequestAllowed(pindex)) {
2237 [ # # # # : 0 : LogDebug(BCLog::NET, "%s: ignoring request from peer=%i for old block that isn't in the main chain\n", __func__, pfrom.GetId());
# # ]
2238 : 0 : return;
2239 : : }
2240 : : // disconnect node in case we have reached the outbound limit for serving historical blocks
2241 [ + - ]: 3031 : if (m_connman.OutboundTargetReached(true) &&
2242 [ - + - - : 3031 : (((m_chainman.m_best_header != nullptr) && (m_chainman.m_best_header->GetBlockTime() - pindex->GetBlockTime() > HISTORICAL_BLOCK_AGE)) || inv.IsMsgFilteredBlk()) &&
- - - - ]
2243 [ # # ]: 0 : !pfrom.HasPermission(NetPermissionFlags::Download) // nodes with the download permission may exceed target
2244 : : ) {
2245 [ # # # # : 0 : LogDebug(BCLog::NET, "historical block serving limit reached, %s\n", pfrom.DisconnectMsg(fLogIPs));
# # # # ]
2246 : 0 : pfrom.fDisconnect = true;
2247 : 0 : return;
2248 : : }
2249 [ + - - + ]: 3031 : tip = m_chainman.ActiveChain().Tip();
2250 : : // Avoid leaking prune-height by never sending blocks below the NODE_NETWORK_LIMITED threshold
2251 [ + + ]: 3031 : if (!pfrom.HasPermission(NetPermissionFlags::NoBan) && (
2252 [ + + + + : 2689 : (((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 */) )
+ - ]
2253 : : )) {
2254 [ # # # # : 0 : LogDebug(BCLog::NET, "Ignore block request below NODE_NETWORK_LIMITED threshold, %s\n", pfrom.DisconnectMsg(fLogIPs));
# # # # ]
2255 : : //disconnect node and prevent it from stalling (would otherwise wait for the missing block)
2256 : 0 : pfrom.fDisconnect = true;
2257 : 0 : return;
2258 : : }
2259 : : // Pruned nodes may have deleted the block, so check whether
2260 : : // it's available before trying to send.
2261 [ + - ]: 3031 : if (!(pindex->nStatus & BLOCK_HAVE_DATA)) {
2262 : : return;
2263 : : }
2264 [ + - ]: 3031 : can_direct_fetch = CanDirectFetch();
2265 [ + - ]: 3031 : block_pos = pindex->GetBlockPos();
2266 : 10692 : }
2267 : :
2268 : 3031 : std::shared_ptr<const CBlock> pblock;
2269 [ - + - - : 3031 : if (a_recent_block && a_recent_block->GetHash() == inv.hash) {
- - ]
2270 : 0 : pblock = a_recent_block;
2271 [ + + ]: 3031 : } else if (inv.IsMsgWitnessBlk()) {
2272 : : // Fast-path: in this case it is possible to serve the block directly from disk,
2273 : : // as the network format matches the format on disk
2274 : 114 : std::vector<std::byte> block_data;
2275 [ + - - + ]: 114 : if (!m_chainman.m_blockman.ReadRawBlock(block_data, block_pos)) {
2276 [ # # # # : 0 : if (WITH_LOCK(m_chainman.GetMutex(), return m_chainman.m_blockman.IsBlockPruned(*pindex))) {
# # # # ]
2277 [ # # # # : 0 : LogDebug(BCLog::NET, "Block was pruned before it could be read, %s\n", pfrom.DisconnectMsg(fLogIPs));
# # # # ]
2278 : : } else {
2279 [ # # # # ]: 0 : LogError("Cannot load block from disk, %s\n", pfrom.DisconnectMsg(fLogIPs));
2280 : : }
2281 : 0 : pfrom.fDisconnect = true;
2282 : 0 : return;
2283 : : }
2284 [ - + + - : 228 : MakeAndPushMessage(pfrom, NetMsgType::BLOCK, std::span{block_data});
+ - ]
2285 : : // Don't set pblock as we've sent the block
2286 : 114 : } else {
2287 : : // Send block from disk
2288 [ + - ]: 2917 : std::shared_ptr<CBlock> pblockRead = std::make_shared<CBlock>();
2289 [ + - - + ]: 2917 : if (!m_chainman.m_blockman.ReadBlock(*pblockRead, block_pos, inv.hash)) {
2290 [ # # # # : 0 : if (WITH_LOCK(m_chainman.GetMutex(), return m_chainman.m_blockman.IsBlockPruned(*pindex))) {
# # # # ]
2291 [ # # # # : 0 : LogDebug(BCLog::NET, "Block was pruned before it could be read, %s\n", pfrom.DisconnectMsg(fLogIPs));
# # # # ]
2292 : : } else {
2293 [ # # # # ]: 0 : LogError("Cannot load block from disk, %s\n", pfrom.DisconnectMsg(fLogIPs));
2294 : : }
2295 [ # # ]: 0 : pfrom.fDisconnect = true;
2296 [ # # ]: 0 : return;
2297 : : }
2298 [ + - ]: 2917 : pblock = pblockRead;
2299 : 2917 : }
2300 [ + + ]: 3031 : if (pblock) {
2301 [ + + ]: 2917 : if (inv.IsMsgBlk()) {
2302 [ + - + - ]: 4034 : MakeAndPushMessage(pfrom, NetMsgType::BLOCK, TX_NO_WITNESS(*pblock));
2303 [ - + ]: 900 : } else if (inv.IsMsgWitnessBlk()) {
2304 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::BLOCK, TX_WITH_WITNESS(*pblock));
2305 [ + + ]: 900 : } else if (inv.IsMsgFilteredBlk()) {
2306 : 783 : bool sendMerkleBlock = false;
2307 [ + - ]: 783 : CMerkleBlock merkleBlock;
2308 [ + - + + ]: 783 : if (auto tx_relay = peer.GetTxRelay(); tx_relay != nullptr) {
2309 [ + - ]: 737 : LOCK(tx_relay->m_bloom_filter_mutex);
2310 [ + + ]: 737 : if (tx_relay->m_bloom_filter) {
2311 : 647 : sendMerkleBlock = true;
2312 [ + - ]: 647 : merkleBlock = CMerkleBlock(*pblock, *tx_relay->m_bloom_filter);
2313 : : }
2314 : 0 : }
2315 [ + + ]: 737 : if (sendMerkleBlock) {
2316 [ + - + - ]: 647 : MakeAndPushMessage(pfrom, NetMsgType::MERKLEBLOCK, merkleBlock);
2317 : : // CMerkleBlock just contains hashes, so also push any transactions in the block the client did not see
2318 : : // This avoids hurting performance by pointlessly requiring a round-trip
2319 : : // Note that there is currently no way for a node to request any single transactions we didn't send here -
2320 : : // they must either disconnect and retry or request the full block.
2321 : : // Thus, the protocol spec specified allows for us to provide duplicate txn here,
2322 : : // however we MUST always provide at least what the remote peer needs
2323 [ + - + + ]: 1200 : for (const auto& [tx_idx, _] : merkleBlock.vMatchedTxn)
2324 [ + - + - ]: 1106 : MakeAndPushMessage(pfrom, NetMsgType::TX, TX_NO_WITNESS(*pblock->vtx[tx_idx]));
2325 : : }
2326 : : // else
2327 : : // no response
2328 [ + - ]: 900 : } else if (inv.IsMsgCmpctBlk()) {
2329 : : // If a peer is asking for old blocks, we're almost guaranteed
2330 : : // they won't have a useful mempool to match against a compact block,
2331 : : // and we don't feel like constructing the object for them, so
2332 : : // instead we respond with the full, non-compact block.
2333 [ + + + + ]: 117 : if (can_direct_fetch && pindex->nHeight >= tip->nHeight - MAX_CMPCTBLOCK_DEPTH) {
2334 [ - + - - : 39 : if (a_recent_compact_block && a_recent_compact_block->header.GetHash() == inv.hash) {
- - ]
2335 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::CMPCTBLOCK, *a_recent_compact_block);
2336 : : } else {
2337 [ + - ]: 39 : CBlockHeaderAndShortTxIDs cmpctblock{*pblock, m_rng.rand64()};
2338 [ + - + - ]: 78 : MakeAndPushMessage(pfrom, NetMsgType::CMPCTBLOCK, cmpctblock);
2339 : 39 : }
2340 : : } else {
2341 [ + - + - ]: 156 : MakeAndPushMessage(pfrom, NetMsgType::BLOCK, TX_WITH_WITNESS(*pblock));
2342 : : }
2343 : : }
2344 : : }
2345 : :
2346 : 3031 : {
2347 [ + - ]: 3031 : LOCK(peer.m_block_inv_mutex);
2348 : : // Trigger the peer node to send a getblocks request for the next batch of inventory
2349 [ - + ]: 3031 : if (inv.hash == peer.m_continuation_block) {
2350 : : // Send immediately. This must send even if redundant,
2351 : : // and we want it right after the last block so they don't
2352 : : // wait for other stuff first.
2353 : 0 : std::vector<CInv> vInv;
2354 [ # # ]: 0 : vInv.emplace_back(MSG_BLOCK, tip->GetBlockHash());
2355 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::INV, vInv);
2356 : 0 : peer.m_continuation_block.SetNull();
2357 : 0 : }
2358 [ + + ]: 3031 : }
2359 [ - + - + : 13723 : }
- + ]
2360 : :
2361 : 48838 : CTransactionRef PeerManagerImpl::FindTxForGetData(const Peer::TxRelay& tx_relay, const GenTxid& gtxid)
2362 : : {
2363 : : // If a tx was in the mempool prior to the last INV for this peer, permit the request.
2364 : 48838 : auto txinfo{std::visit(
2365 : 97676 : [&](const auto& id) EXCLUSIVE_LOCKS_REQUIRED(NetEventsInterface::g_msgproc_mutex) {
2366 : 48838 : return m_mempool.info_for_relay(id, tx_relay.m_last_inv_sequence);
2367 : : },
2368 : 48838 : gtxid)};
2369 [ - + ]: 48838 : if (txinfo.tx) {
2370 : 0 : return std::move(txinfo.tx);
2371 : : }
2372 : :
2373 : : // Or it might be from the most recent block
2374 : 48838 : {
2375 [ + - ]: 48838 : LOCK(m_most_recent_block_mutex);
2376 [ - + ]: 48838 : if (m_most_recent_block_txs != nullptr) {
2377 : 0 : auto it = m_most_recent_block_txs->find(gtxid);
2378 [ # # # # : 0 : if (it != m_most_recent_block_txs->end()) return it->second;
# # ]
2379 : : }
2380 : 0 : }
2381 : :
2382 : 48838 : return {};
2383 : 48838 : }
2384 : :
2385 : 540009 : void PeerManagerImpl::ProcessGetData(CNode& pfrom, Peer& peer, const std::atomic<bool>& interruptMsgProc)
2386 : : {
2387 : 540009 : AssertLockNotHeld(cs_main);
2388 : :
2389 : 540009 : auto tx_relay = peer.GetTxRelay();
2390 : :
2391 : 540009 : std::deque<CInv>::iterator it = peer.m_getdata_requests.begin();
2392 : 540009 : std::vector<CInv> vNotFound;
2393 : :
2394 : : // Process as many TX items from the front of the getdata queue as
2395 : : // possible, since they're common and it's efficient to batch process
2396 : : // them.
2397 [ + + + + ]: 589282 : while (it != peer.m_getdata_requests.end() && it->IsGenTxMsg()) {
2398 [ - + ]: 49273 : if (interruptMsgProc) return;
2399 : : // The send buffer provides backpressure. If there's no space in
2400 : : // the buffer, pause processing until the next call.
2401 [ + - ]: 49273 : if (pfrom.fPauseSend) break;
2402 : :
2403 : 49273 : const CInv &inv = *it++;
2404 : :
2405 [ + + ]: 49273 : if (tx_relay == nullptr) {
2406 : : // Ignore GETDATA requests for transactions from block-relay-only
2407 : : // peers and peers that asked us not to announce transactions.
2408 : 435 : continue;
2409 : : }
2410 : :
2411 [ + - + - : 48838 : if (auto tx{FindTxForGetData(*tx_relay, ToGenTxid(inv))}) {
- + ]
2412 : : // WTX and WITNESS_TX imply we serialize with witness
2413 [ # # ]: 0 : const auto maybe_with_witness = (inv.IsMsgTx() ? TX_NO_WITNESS : TX_WITH_WITNESS);
2414 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::TX, maybe_with_witness(*tx));
2415 [ # # ]: 0 : m_mempool.RemoveUnbroadcastTx(tx->GetHash());
2416 : : } else {
2417 [ + - ]: 48838 : vNotFound.push_back(inv);
2418 : 48838 : }
2419 : : }
2420 : :
2421 : : // Only process one BLOCK item per call, since they're uncommon and can be
2422 : : // expensive to process.
2423 [ + + + - ]: 540009 : if (it != peer.m_getdata_requests.end() && !pfrom.fPauseSend) {
2424 : 539770 : const CInv &inv = *it++;
2425 [ + + ]: 539770 : if (inv.IsGenBlkMsg()) {
2426 [ + - ]: 13723 : ProcessGetBlockData(pfrom, peer, inv);
2427 : : }
2428 : : // else: If the first item on the queue is an unknown type, we erase it
2429 : : // and continue processing the queue on the next call.
2430 : : // NOTE: previously we wouldn't do so and the peer sending us a malformed GETDATA could
2431 : : // result in never making progress and this thread using 100% allocated CPU. See
2432 : : // https://bitcoincore.org/en/2024/07/03/disclose-getdata-cpu.
2433 : : }
2434 : :
2435 : 540009 : peer.m_getdata_requests.erase(peer.m_getdata_requests.begin(), it);
2436 : :
2437 [ + + ]: 540009 : if (!vNotFound.empty()) {
2438 : : // Let the peer know that we didn't find what it asked for, so it doesn't
2439 : : // have to wait around forever.
2440 : : // SPV clients care about this message: it's needed when they are
2441 : : // recursively walking the dependencies of relevant unconfirmed
2442 : : // transactions. SPV clients want to do that because they want to know
2443 : : // about (and store and rebroadcast and risk analyze) the dependencies
2444 : : // of transactions relevant to them, without having to download the
2445 : : // entire memory pool.
2446 : : // Also, other nodes can use these messages to automatically request a
2447 : : // transaction from some other peer that announced it, and stop
2448 : : // waiting for us to respond.
2449 : : // In normal operation, we often send NOTFOUND messages for parents of
2450 : : // transactions that we relay; if a peer is missing a parent, they may
2451 : : // assume we have them and request the parents from us.
2452 [ + - + - ]: 42036 : MakeAndPushMessage(pfrom, NetMsgType::NOTFOUND, vNotFound);
2453 : : }
2454 : 540009 : }
2455 : :
2456 : 103 : uint32_t PeerManagerImpl::GetFetchFlags(const Peer& peer) const
2457 : : {
2458 : 103 : uint32_t nFetchFlags = 0;
2459 [ + - ]: 103 : if (CanServeWitnesses(peer)) {
2460 : 103 : nFetchFlags |= MSG_WITNESS_FLAG;
2461 : : }
2462 : 103 : return nFetchFlags;
2463 : : }
2464 : :
2465 : 120 : void PeerManagerImpl::SendBlockTransactions(CNode& pfrom, Peer& peer, const CBlock& block, const BlockTransactionsRequest& req)
2466 : : {
2467 : 120 : BlockTransactions resp(req);
2468 : 120 : unsigned int tx_requested_size = 0;
2469 [ - + + + ]: 192 : for (size_t i = 0; i < req.indexes.size(); i++) {
2470 [ - + + + ]: 105 : if (req.indexes[i] >= block.vtx.size()) {
2471 [ + - + - ]: 33 : Misbehaving(peer, "getblocktxn with out-of-bounds tx indices");
2472 : 33 : return;
2473 : : }
2474 : 72 : resp.txn[i] = block.vtx[req.indexes[i]];
2475 [ + - ]: 72 : tx_requested_size += resp.txn[i]->GetTotalSize();
2476 : : }
2477 : :
2478 [ + - - + : 87 : LogDebug(BCLog::CMPCTBLOCK, "Peer %d sent us a GETBLOCKTXN for block %s, sending a BLOCKTXN with %u txns. (%u bytes)\n", pfrom.GetId(), block.GetHash().ToString(), resp.txn.size(), tx_requested_size);
- - - - -
- - - ]
2479 [ + - + - ]: 174 : MakeAndPushMessage(pfrom, NetMsgType::BLOCKTXN, resp);
2480 : 120 : }
2481 : :
2482 : 11273 : bool PeerManagerImpl::CheckHeadersPoW(const std::vector<CBlockHeader>& headers, const Consensus::Params& consensusParams, Peer& peer)
2483 : : {
2484 : : // Do these headers have proof-of-work matching what's claimed?
2485 [ + + ]: 11273 : if (!HasValidProofOfWork(headers, consensusParams)) {
2486 [ + - ]: 668 : Misbehaving(peer, "header with invalid proof of work");
2487 : 668 : return false;
2488 : : }
2489 : :
2490 : : // Are these headers connected to each other?
2491 [ + + ]: 10605 : if (!CheckHeadersAreContinuous(headers)) {
2492 [ + - ]: 91 : Misbehaving(peer, "non-continuous headers sequence");
2493 : 91 : return false;
2494 : : }
2495 : : return true;
2496 : : }
2497 : :
2498 : 8854 : arith_uint256 PeerManagerImpl::GetAntiDoSWorkThreshold()
2499 : : {
2500 : 8854 : arith_uint256 near_chaintip_work = 0;
2501 : 8854 : LOCK(cs_main);
2502 [ + - - + : 17708 : if (m_chainman.ActiveChain().Tip() != nullptr) {
+ - ]
2503 [ + - - + ]: 8854 : const CBlockIndex *tip = m_chainman.ActiveChain().Tip();
2504 : : // Use a 144 block buffer, so that we'll accept headers that fork from
2505 : : // near our tip.
2506 [ + - + - : 17708 : near_chaintip_work = tip->nChainWork - std::min<arith_uint256>(144*GetBlockProof(*tip), tip->nChainWork);
+ - ]
2507 : : }
2508 [ + - + - : 8854 : return std::max(near_chaintip_work, m_chainman.MinimumChainWork());
+ - ]
2509 : 8854 : }
2510 : :
2511 : : /**
2512 : : * Special handling for unconnecting headers that might be part of a block
2513 : : * announcement.
2514 : : *
2515 : : * We'll send a getheaders message in response to try to connect the chain.
2516 : : */
2517 : 4190 : void PeerManagerImpl::HandleUnconnectingHeaders(CNode& pfrom, Peer& peer,
2518 : : const std::vector<CBlockHeader>& headers)
2519 : : {
2520 : : // Try to fill in the missing headers.
2521 [ + - ]: 8380 : const CBlockIndex* best_header{WITH_LOCK(cs_main, return m_chainman.m_best_header)};
2522 [ + - + + ]: 4190 : if (MaybeSendGetHeaders(pfrom, GetLocator(best_header), peer)) {
2523 [ - + - - : 441 : LogDebug(BCLog::NET, "received header %s: missing prev block %s, sending getheaders (%d) to end (peer=%d)\n",
- - - - ]
2524 : : headers[0].GetHash().ToString(),
2525 : : headers[0].hashPrevBlock.ToString(),
2526 : : best_header->nHeight,
2527 : : pfrom.GetId());
2528 : : }
2529 : :
2530 : : // Set hashLastUnknownBlock for this peer, so that if we
2531 : : // eventually get the headers - even from a different peer -
2532 : : // we can use this peer to download.
2533 [ + - + - ]: 12570 : WITH_LOCK(cs_main, UpdateBlockAvailability(pfrom.GetId(), headers.back().GetHash()));
2534 : 4190 : }
2535 : :
2536 : 10605 : bool PeerManagerImpl::CheckHeadersAreContinuous(const std::vector<CBlockHeader>& headers) const
2537 : : {
2538 : 10605 : uint256 hashLastBlock;
2539 [ + + ]: 131725 : for (const CBlockHeader& header : headers) {
2540 [ + + + + ]: 121211 : if (!hashLastBlock.IsNull() && header.hashPrevBlock != hashLastBlock) {
2541 : : return false;
2542 : : }
2543 : 121120 : hashLastBlock = header.GetHash();
2544 : : }
2545 : : return true;
2546 : : }
2547 : :
2548 : 10857 : bool PeerManagerImpl::IsContinuationOfLowWorkHeadersSync(Peer& peer, CNode& pfrom, std::vector<CBlockHeader>& headers)
2549 : : {
2550 [ + + ]: 10857 : if (peer.m_headers_sync) {
2551 [ - + ]: 3864 : auto result = peer.m_headers_sync->ProcessNextHeaders(headers, headers.size() == m_opts.max_headers_result);
2552 : : // If it is a valid continuation, we should treat the existing getheaders request as responded to.
2553 [ + + ]: 3864 : if (result.success) peer.m_last_getheaders_timestamp = {};
2554 [ + + ]: 3864 : if (result.request_more) {
2555 [ + - ]: 3585 : auto locator = peer.m_headers_sync->NextHeadersRequestLocator();
2556 : : // If we were instructed to ask for a locator, it should not be empty.
2557 [ + - ]: 3585 : Assume(!locator.vHave.empty());
2558 : : // We can only be instructed to request more if processing was successful.
2559 [ + - ]: 3585 : Assume(result.success);
2560 [ + - ]: 3585 : if (!locator.vHave.empty()) {
2561 : : // It should be impossible for the getheaders request to fail,
2562 : : // because we just cleared the last getheaders timestamp.
2563 [ + - ]: 3585 : bool sent_getheaders = MaybeSendGetHeaders(pfrom, locator, peer);
2564 [ + - ]: 3585 : Assume(sent_getheaders);
2565 [ + - - + : 3585 : LogDebug(BCLog::NET, "more getheaders (from %s) to peer=%d\n",
- - - - ]
2566 : : locator.vHave.front().ToString(), pfrom.GetId());
2567 : : }
2568 : 3585 : }
2569 : :
2570 [ + + ]: 3864 : if (peer.m_headers_sync->GetState() == HeadersSyncState::State::FINAL) {
2571 [ + - ]: 279 : peer.m_headers_sync.reset(nullptr);
2572 : :
2573 : : // Delete this peer's entry in m_headers_presync_stats.
2574 : : // If this is m_headers_presync_bestpeer, it will be replaced later
2575 : : // by the next peer that triggers the else{} branch below.
2576 [ + - ]: 279 : LOCK(m_headers_presync_mutex);
2577 [ + - ]: 279 : m_headers_presync_stats.erase(pfrom.GetId());
2578 : 279 : } else {
2579 : : // Build statistics for this peer's sync.
2580 : 3585 : HeadersPresyncStats stats;
2581 [ + - ]: 3585 : stats.first = peer.m_headers_sync->GetPresyncWork();
2582 [ + - ]: 3585 : if (peer.m_headers_sync->GetState() == HeadersSyncState::State::PRESYNC) {
2583 : 3585 : stats.second = {peer.m_headers_sync->GetPresyncHeight(),
2584 : 3585 : peer.m_headers_sync->GetPresyncTime()};
2585 : : }
2586 : :
2587 : : // Update statistics in stats.
2588 [ + - ]: 3585 : LOCK(m_headers_presync_mutex);
2589 [ + - ]: 3585 : m_headers_presync_stats[pfrom.GetId()] = stats;
2590 : 3585 : auto best_it = m_headers_presync_stats.find(m_headers_presync_bestpeer);
2591 : 3585 : bool best_updated = false;
2592 [ + + ]: 3585 : if (best_it == m_headers_presync_stats.end()) {
2593 : : // If the cached best peer is outdated, iterate over all remaining ones (including
2594 : : // newly updated one) to find the best one.
2595 : 167 : NodeId peer_best{-1};
2596 : 167 : const HeadersPresyncStats* stat_best{nullptr};
2597 [ - + + + ]: 334 : for (const auto& [peer, stat] : m_headers_presync_stats) {
2598 [ - + - - : 167 : if (!stat_best || stat > *stat_best) {
- - ]
2599 : 167 : peer_best = peer;
2600 : 167 : stat_best = &stat;
2601 : : }
2602 : : }
2603 : 167 : m_headers_presync_bestpeer = peer_best;
2604 [ + - ]: 167 : best_updated = (peer_best == pfrom.GetId());
2605 [ - + - - : 3418 : } else if (best_it->first == pfrom.GetId() || stats > best_it->second) {
- - ]
2606 : : // pfrom was and remains the best peer, or pfrom just became best.
2607 : 3418 : m_headers_presync_bestpeer = pfrom.GetId();
2608 : 3418 : best_updated = true;
2609 : : }
2610 [ + - + - ]: 3585 : if (best_updated && stats.second.has_value()) {
2611 : : // If the best peer updated, and it is in its first phase, signal.
2612 : 3585 : m_headers_presync_should_signal = true;
2613 : : }
2614 : 3585 : }
2615 : :
2616 [ + + ]: 3864 : if (result.success) {
2617 : : // We only overwrite the headers passed in if processing was
2618 : : // successful.
2619 : 3585 : headers.swap(result.pow_validated_headers);
2620 : : }
2621 : :
2622 : 3864 : return result.success;
2623 : 3864 : }
2624 : : // Either we didn't have a sync in progress, or something went wrong
2625 : : // processing these headers, or we are returning headers to the caller to
2626 : : // process.
2627 : : return false;
2628 : : }
2629 : :
2630 : 1037 : bool PeerManagerImpl::TryLowWorkHeadersSync(Peer& peer, CNode& pfrom, const CBlockIndex* chain_start_header, std::vector<CBlockHeader>& headers)
2631 : : {
2632 : : // Calculate the claimed total work on this chain.
2633 [ - + ]: 1037 : arith_uint256 total_work = chain_start_header->nChainWork + CalculateClaimedHeadersWork(headers);
2634 : :
2635 : : // Our dynamic anti-DoS threshold (minimum work required on a headers chain
2636 : : // before we'll store it)
2637 : 1037 : arith_uint256 minimum_chain_work = GetAntiDoSWorkThreshold();
2638 : :
2639 : : // Avoid DoS via low-difficulty-headers by only processing if the headers
2640 : : // are part of a chain with sufficient work.
2641 [ + + ]: 1037 : if (total_work < minimum_chain_work) {
2642 : : // Only try to sync with this peer if their headers message was full;
2643 : : // otherwise they don't have more headers after this so no point in
2644 : : // trying to sync their too-little-work chain.
2645 [ - + + + ]: 418 : if (headers.size() == m_opts.max_headers_result) {
2646 : : // Note: we could advance to the last header in this set that is
2647 : : // known to us, rather than starting at the first header (which we
2648 : : // may already have); however this is unlikely to matter much since
2649 : : // ProcessHeadersMessage() already handles the case where all
2650 : : // headers in a received message are already known and are
2651 : : // ancestors of m_best_header or chainActive.Tip(), by skipping
2652 : : // this logic in that case. So even if the first header in this set
2653 : : // of headers is known, some header in this set must be new, so
2654 : : // advancing to the first unknown header would be a small effect.
2655 : 343 : LOCK(peer.m_headers_sync_mutex);
2656 [ + - - + ]: 343 : peer.m_headers_sync.reset(new HeadersSyncState(peer.m_id, m_chainparams.GetConsensus(),
2657 [ + - + - ]: 343 : chain_start_header, minimum_chain_work));
2658 : :
2659 : : // Now a HeadersSyncState object for tracking this synchronization
2660 : : // is created, process the headers using it as normal. Failures are
2661 : : // handled inside of IsContinuationOfLowWorkHeadersSync.
2662 [ + - ]: 343 : (void)IsContinuationOfLowWorkHeadersSync(peer, pfrom, headers);
2663 : 343 : } else {
2664 [ - + - - ]: 75 : LogDebug(BCLog::NET, "Ignoring low-work chain (height=%u) from peer=%d\n", chain_start_header->nHeight + headers.size(), pfrom.GetId());
2665 : : }
2666 : :
2667 : : // The peer has not yet given us a chain that meets our work threshold,
2668 : : // so we want to prevent further processing of the headers in any case.
2669 : 418 : headers = {};
2670 : 418 : return true;
2671 : : }
2672 : :
2673 : : return false;
2674 : : }
2675 : :
2676 : 2906 : bool PeerManagerImpl::IsAncestorOfBestHeaderOrTip(const CBlockIndex* header)
2677 : : {
2678 [ + + ]: 2906 : if (header == nullptr) {
2679 : : return false;
2680 [ + - + - ]: 952 : } else if (m_chainman.m_best_header != nullptr && header == m_chainman.m_best_header->GetAncestor(header->nHeight)) {
2681 : : return true;
2682 [ - + ]: 952 : } else if (m_chainman.ActiveChain().Contains(header)) {
2683 : 0 : return true;
2684 : : }
2685 : : return false;
2686 : : }
2687 : :
2688 : 11536 : bool PeerManagerImpl::MaybeSendGetHeaders(CNode& pfrom, const CBlockLocator& locator, Peer& peer)
2689 : : {
2690 : 11536 : const auto current_time = NodeClock::now();
2691 : :
2692 : : // Only allow a new getheaders message to go out if we don't have a recent
2693 : : // one already in-flight
2694 [ + + ]: 11536 : if (current_time - peer.m_last_getheaders_timestamp > HEADERS_RESPONSE_TIME) {
2695 [ + - ]: 7411 : MakeAndPushMessage(pfrom, NetMsgType::GETHEADERS, locator, uint256());
2696 : 7411 : peer.m_last_getheaders_timestamp = current_time;
2697 : 7411 : return true;
2698 : : }
2699 : : return false;
2700 : : }
2701 : :
2702 : : /*
2703 : : * Given a new headers tip ending in last_header, potentially request blocks towards that tip.
2704 : : * We require that the given tip have at least as much work as our tip, and for
2705 : : * our current tip to be "close to synced" (see CanDirectFetch()).
2706 : : */
2707 : 1822 : void PeerManagerImpl::HeadersDirectFetchBlocks(CNode& pfrom, const Peer& peer, const CBlockIndex& last_header)
2708 : : {
2709 : 1822 : LOCK(cs_main);
2710 : 1822 : CNodeState *nodestate = State(pfrom.GetId());
2711 : :
2712 [ + - + + : 2543 : if (CanDirectFetch() && last_header.IsValid(BLOCK_VALID_TREE) && m_chainman.ActiveChain().Tip()->nChainWork <= last_header.nChainWork) {
+ - + - -
+ + - + +
+ - ]
2713 : 187 : std::vector<const CBlockIndex*> vToFetch;
2714 : 187 : const CBlockIndex* pindexWalk{&last_header};
2715 : : // Calculate all the blocks we'd need to switch to last_header, up to a limit.
2716 [ + - + - : 561 : while (pindexWalk && !m_chainman.ActiveChain().Contains(pindexWalk) && vToFetch.size() <= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
+ + - + ]
2717 [ + + ]: 187 : if (!(pindexWalk->nStatus & BLOCK_HAVE_DATA) &&
2718 [ + - + - ]: 314 : !IsBlockRequested(pindexWalk->GetBlockHash()) &&
2719 [ + + ]: 254 : (!DeploymentActiveAt(*pindexWalk, m_chainman, Consensus::DEPLOYMENT_SEGWIT) || CanServeWitnesses(peer))) {
2720 : : // We don't have this block, and it's not yet in flight.
2721 [ + - ]: 103 : vToFetch.push_back(pindexWalk);
2722 : : }
2723 : 187 : pindexWalk = pindexWalk->pprev;
2724 : : }
2725 : : // If pindexWalk still isn't on our main chain, we're looking at a
2726 : : // very large reorg at a time we think we're close to caught up to
2727 : : // the main chain -- this shouldn't really happen. Bail out on the
2728 : : // direct fetch and rely on parallel download instead.
2729 [ + - - + ]: 187 : if (!m_chainman.ActiveChain().Contains(pindexWalk)) {
2730 [ # # # # : 0 : LogDebug(BCLog::NET, "Large reorg, won't direct fetch to %s (%d)\n",
# # # # ]
2731 : : last_header.GetBlockHash().ToString(),
2732 : : last_header.nHeight);
2733 : : } else {
2734 : 187 : std::vector<CInv> vGetData;
2735 : : // Download as much as possible, from earliest to latest.
2736 [ + + ]: 290 : for (const CBlockIndex* pindex : vToFetch | std::views::reverse) {
2737 [ + - ]: 103 : if (nodestate->vBlocksInFlight.size() >= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
2738 : : // Can't download any more from this peer
2739 : : break;
2740 : : }
2741 : 103 : uint32_t nFetchFlags = GetFetchFlags(peer);
2742 [ + - ]: 103 : vGetData.emplace_back(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash());
2743 [ + - ]: 103 : BlockRequested(pfrom.GetId(), *pindex);
2744 [ + - - + : 103 : LogDebug(BCLog::NET, "Requesting block %s from peer=%d\n",
- - - - ]
2745 : : pindex->GetBlockHash().ToString(), pfrom.GetId());
2746 : : }
2747 [ - + - + ]: 187 : if (vGetData.size() > 1) {
2748 [ # # # # : 0 : LogDebug(BCLog::NET, "Downloading blocks toward %s (%d) via headers direct fetch\n",
# # # # ]
2749 : : last_header.GetBlockHash().ToString(),
2750 : : last_header.nHeight);
2751 : : }
2752 [ - + + + ]: 187 : if (vGetData.size() > 0) {
2753 : 206 : if (!m_opts.ignore_incoming_txs &&
2754 [ + + ]: 103 : nodestate->m_provides_cmpctblocks &&
2755 [ + - + + ]: 9 : vGetData.size() == 1 &&
2756 [ + - + + ]: 112 : mapBlocksInFlight.size() == 1 &&
2757 [ + - + - ]: 3 : last_header.pprev->IsValid(BLOCK_VALID_CHAIN)) {
2758 : : // In any case, we want to download using a compact block, not a regular one
2759 [ + - ]: 3 : vGetData[0] = CInv(MSG_CMPCT_BLOCK, vGetData[0].hash);
2760 : : }
2761 [ + - + - ]: 206 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, vGetData);
2762 : : }
2763 : 187 : }
2764 : 187 : }
2765 : 1822 : }
2766 : :
2767 : : /**
2768 : : * Given receipt of headers from a peer ending in last_header, along with
2769 : : * whether that header was new and whether the headers message was full,
2770 : : * update the state we keep for the peer.
2771 : : */
2772 : 1822 : void PeerManagerImpl::UpdatePeerStateForReceivedHeaders(CNode& pfrom, Peer& peer,
2773 : : const CBlockIndex& last_header, bool received_new_header, bool may_have_more_headers)
2774 : : {
2775 : 1822 : LOCK(cs_main);
2776 : 1822 : CNodeState *nodestate = State(pfrom.GetId());
2777 : :
2778 [ + - ]: 1822 : UpdateBlockAvailability(pfrom.GetId(), last_header.GetBlockHash());
2779 : :
2780 : : // From here, pindexBestKnownBlock should be guaranteed to be non-null,
2781 : : // because it is set in UpdateBlockAvailability. Some nullptr checks
2782 : : // are still present, however, as belt-and-suspenders.
2783 : :
2784 [ + + + - : 2693 : if (received_new_header && last_header.nChainWork > m_chainman.ActiveChain().Tip()->nChainWork) {
- + + - -
+ ]
2785 [ # # ]: 0 : nodestate->m_last_block_announcement = GetTime();
2786 : : }
2787 : :
2788 : : // If we're in IBD, we want outbound peers that will serve us a useful
2789 : : // chain. Disconnect peers that are on chains with insufficient work.
2790 [ + - + + : 1822 : if (m_chainman.IsInitialBlockDownload() && !may_have_more_headers) {
+ - ]
2791 : : // If the peer has no more headers to give us, then we know we have
2792 : : // their tip.
2793 [ + - + - : 1408 : if (nodestate->pindexBestKnownBlock && nodestate->pindexBestKnownBlock->nChainWork < m_chainman.MinimumChainWork()) {
+ - - + ]
2794 : : // This peer has too little work on their headers chain to help
2795 : : // us sync -- disconnect if it is an outbound disconnection
2796 : : // candidate.
2797 : : // Note: We compare their tip to the minimum chain work (rather than
2798 : : // m_chainman.ActiveChain().Tip()) because we won't start block download
2799 : : // until we have a headers chain that has at least
2800 : : // the minimum chain work, even if a peer has a chain past our tip,
2801 : : // as an anti-DoS measure.
2802 [ # # ]: 0 : if (pfrom.IsOutboundOrBlockRelayConn()) {
2803 [ # # # # ]: 0 : LogInfo("outbound peer headers chain has insufficient work, %s\n", pfrom.DisconnectMsg(fLogIPs));
2804 : 0 : pfrom.fDisconnect = true;
2805 : : }
2806 : : }
2807 : : }
2808 : :
2809 : : // If this is an outbound full-relay peer, check to see if we should protect
2810 : : // it from the bad/lagging chain logic.
2811 : : // Note that outbound block-relay peers are excluded from this protection, and
2812 : : // thus always subject to eviction under the bad/lagging chain logic.
2813 : : // See ChainSyncTimeoutState.
2814 [ + - + + : 1822 : if (!pfrom.fDisconnect && pfrom.IsFullOutboundConn() && nodestate->pindexBestKnownBlock != nullptr) {
+ - ]
2815 [ + - + - : 530 : 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) {
- + + - +
+ + + ]
2816 [ + - - + : 24 : LogDebug(BCLog::NET, "Protecting outbound peer=%d from eviction\n", pfrom.GetId());
- - ]
2817 : 24 : nodestate->m_chain_sync.m_protect = true;
2818 : 24 : ++m_outbound_peers_with_protect_from_disconnect;
2819 : : }
2820 : : }
2821 : 1822 : }
2822 : :
2823 : 11357 : void PeerManagerImpl::ProcessHeadersMessage(CNode& pfrom, Peer& peer,
2824 : : std::vector<CBlockHeader>&& headers,
2825 : : bool via_compact_block)
2826 : : {
2827 [ - + ]: 11357 : size_t nCount = headers.size();
2828 : :
2829 [ + + ]: 11357 : if (nCount == 0) {
2830 : : // Nothing interesting. Stop asking this peers for more headers.
2831 : : // If we were in the middle of headers sync, receiving an empty headers
2832 : : // message suggests that the peer suddenly has nothing to give us
2833 : : // (perhaps it reorged to our chain). Clear download state for this peer.
2834 : 84 : LOCK(peer.m_headers_sync_mutex);
2835 [ - + ]: 84 : if (peer.m_headers_sync) {
2836 : 0 : peer.m_headers_sync.reset(nullptr);
2837 [ # # ]: 0 : LOCK(m_headers_presync_mutex);
2838 [ # # ]: 0 : m_headers_presync_stats.erase(pfrom.GetId());
2839 : 0 : }
2840 : : // A headers message with no headers cannot be an announcement, so assume
2841 : : // it is a response to our last getheaders request, if there is one.
2842 : 84 : peer.m_last_getheaders_timestamp = {};
2843 [ + - ]: 84 : return;
2844 : 84 : }
2845 : :
2846 : : // Before we do any processing, make sure these pass basic sanity checks.
2847 : : // We'll rely on headers having valid proof-of-work further down, as an
2848 : : // anti-DoS criteria (note: this check is required before passing any
2849 : : // headers into HeadersSyncState).
2850 [ + + ]: 11273 : if (!CheckHeadersPoW(headers, m_chainparams.GetConsensus(), peer)) {
2851 : : // Misbehaving() calls are handled within CheckHeadersPoW(), so we can
2852 : : // just return. (Note that even if a header is announced via compact
2853 : : // block, the header itself should be valid, so this type of error can
2854 : : // always be punished.)
2855 : : return;
2856 : : }
2857 : :
2858 : 10514 : const CBlockIndex *pindexLast = nullptr;
2859 : :
2860 : : // We'll set already_validated_work to true if these headers are
2861 : : // successfully processed as part of a low-work headers sync in progress
2862 : : // (either in PRESYNC or REDOWNLOAD phase).
2863 : : // If true, this will mean that any headers returned to us (ie during
2864 : : // REDOWNLOAD) can be validated without further anti-DoS checks.
2865 : 10514 : bool already_validated_work = false;
2866 : :
2867 : : // If we're in the middle of headers sync, let it do its magic.
2868 : 10514 : bool have_headers_sync = false;
2869 : 10514 : {
2870 : 10514 : LOCK(peer.m_headers_sync_mutex);
2871 : :
2872 [ + - ]: 10514 : already_validated_work = IsContinuationOfLowWorkHeadersSync(peer, pfrom, headers);
2873 : :
2874 : : // The headers we passed in may have been:
2875 : : // - untouched, perhaps if no headers-sync was in progress, or some
2876 : : // failure occurred
2877 : : // - erased, such as if the headers were successfully processed and no
2878 : : // additional headers processing needs to take place (such as if we
2879 : : // are still in PRESYNC)
2880 : : // - replaced with headers that are now ready for validation, such as
2881 : : // during the REDOWNLOAD phase of a low-work headers sync.
2882 : : // So just check whether we still have headers that we need to process,
2883 : : // or not.
2884 [ + + ]: 10514 : if (headers.empty()) {
2885 [ + - ]: 3418 : return;
2886 : : }
2887 : :
2888 [ + - ]: 7096 : have_headers_sync = !!peer.m_headers_sync;
2889 : 3418 : }
2890 : :
2891 : : // Do these headers connect to something in our block index?
2892 [ + - + - ]: 21288 : const CBlockIndex *chain_start_header{WITH_LOCK(::cs_main, return m_chainman.m_blockman.LookupBlockIndex(headers[0].hashPrevBlock))};
2893 : 7096 : bool headers_connect_blockindex{chain_start_header != nullptr};
2894 : :
2895 [ + + ]: 7096 : if (!headers_connect_blockindex) {
2896 : : // This could be a BIP 130 block announcement, use
2897 : : // special logic for handling headers that don't connect, as this
2898 : : // could be benign.
2899 : 4190 : HandleUnconnectingHeaders(pfrom, peer, headers);
2900 : 4190 : return;
2901 : : }
2902 : :
2903 : : // If headers connect, assume that this is in response to any outstanding getheaders
2904 : : // request we may have sent, and clear out the time of our last request. Non-connecting
2905 : : // headers cannot be a response to a getheaders request.
2906 : 2906 : peer.m_last_getheaders_timestamp = {};
2907 : :
2908 : : // If the headers we received are already in memory and an ancestor of
2909 : : // m_best_header or our tip, skip anti-DoS checks. These headers will not
2910 : : // use any more memory (and we are not leaking information that could be
2911 : : // used to fingerprint us).
2912 : 2906 : const CBlockIndex *last_received_header{nullptr};
2913 : 2906 : {
2914 : 2906 : LOCK(cs_main);
2915 [ + - + - ]: 2906 : last_received_header = m_chainman.m_blockman.LookupBlockIndex(headers.back().GetHash());
2916 [ + - - + ]: 2906 : if (IsAncestorOfBestHeaderOrTip(last_received_header)) {
2917 : 0 : already_validated_work = true;
2918 : : }
2919 : 0 : }
2920 : :
2921 : : // If our peer has NetPermissionFlags::NoBan privileges, then bypass our
2922 : : // anti-DoS logic (this saves bandwidth when we connect to a trusted peer
2923 : : // on startup).
2924 [ + + ]: 2906 : if (pfrom.HasPermission(NetPermissionFlags::NoBan)) {
2925 : : already_validated_work = true;
2926 : : }
2927 : :
2928 : : // At this point, the headers connect to something in our block index.
2929 : : // Do anti-DoS checks to determine if we should process or store for later
2930 : : // processing.
2931 [ + - + + ]: 1037 : if (!already_validated_work && TryLowWorkHeadersSync(peer, pfrom,
2932 : : chain_start_header, headers)) {
2933 : : // If we successfully started a low-work headers sync, then there
2934 : : // should be no headers to process any further.
2935 : 418 : Assume(headers.empty());
2936 : 418 : return;
2937 : : }
2938 : :
2939 : : // At this point, we have a set of headers with sufficient work on them
2940 : : // which can be processed.
2941 : :
2942 : : // If we don't have the last header, then this peer will have given us
2943 : : // something new (if these headers are valid).
2944 : 2488 : bool received_new_header{last_received_header == nullptr};
2945 : :
2946 : : // Now process all the headers.
2947 [ - + ]: 2488 : BlockValidationState state;
2948 [ - + + - ]: 2488 : const bool processed{m_chainman.ProcessNewBlockHeaders(headers,
2949 : : /*min_pow_checked=*/true,
2950 : : state, &pindexLast)};
2951 [ + + ]: 2488 : if (!processed) {
2952 [ + - ]: 666 : if (state.IsInvalid()) {
2953 [ + - + - ]: 666 : MaybePunishNodeForBlock(pfrom.GetId(), state, via_compact_block, "invalid header received");
2954 : 666 : return;
2955 : : }
2956 : : }
2957 [ - + ]: 1822 : assert(pindexLast);
2958 : :
2959 [ + + ]: 1822 : if (processed && received_new_header) {
2960 [ + - ]: 871 : LogBlockHeader(*pindexLast, pfrom, /*via_compact_block=*/false);
2961 : : }
2962 : :
2963 : : // Consider fetching more headers if we are not using our headers-sync mechanism.
2964 [ - + - - ]: 1822 : if (nCount == m_opts.max_headers_result && !have_headers_sync) {
2965 : : // Headers message had its maximum size; the peer may have more headers.
2966 [ # # # # : 0 : if (MaybeSendGetHeaders(pfrom, GetLocator(pindexLast), peer)) {
# # ]
2967 [ # # # # : 0 : LogDebug(BCLog::NET, "more getheaders (%d) to end to peer=%d (startheight:%d)\n",
# # ]
2968 : : pindexLast->nHeight, pfrom.GetId(), peer.m_starting_height);
2969 : : }
2970 : : }
2971 : :
2972 [ + - ]: 1822 : UpdatePeerStateForReceivedHeaders(pfrom, peer, *pindexLast, received_new_header, nCount == m_opts.max_headers_result);
2973 : :
2974 : : // Consider immediately downloading blocks.
2975 [ + - ]: 1822 : HeadersDirectFetchBlocks(pfrom, peer, *pindexLast);
2976 : :
2977 : : return;
2978 : 2488 : }
2979 : :
2980 : 4399 : std::optional<node::PackageToValidate> PeerManagerImpl::ProcessInvalidTx(NodeId nodeid, const CTransactionRef& ptx, const TxValidationState& state,
2981 : : bool first_time_failure)
2982 : : {
2983 : 4399 : AssertLockNotHeld(m_peer_mutex);
2984 : 4399 : AssertLockHeld(g_msgproc_mutex);
2985 : 4399 : AssertLockHeld(m_tx_download_mutex);
2986 : :
2987 : 4399 : PeerRef peer{GetPeerRef(nodeid)};
2988 : :
2989 [ + - - + : 4399 : LogDebug(BCLog::MEMPOOLREJ, "%s (wtxid=%s) from peer=%d was not accepted: %s\n",
- - - - -
- - - ]
2990 : : ptx->GetHash().ToString(),
2991 : : ptx->GetWitnessHash().ToString(),
2992 : : nodeid,
2993 : : state.ToString());
2994 : :
2995 [ + - ]: 4399 : const auto& [add_extra_compact_tx, unique_parents, package_to_validate] = m_txdownloadman.MempoolRejectedTx(ptx, state, nodeid, first_time_failure);
2996 : :
2997 [ + - + + ]: 4399 : if (add_extra_compact_tx && RecursiveDynamicUsage(*ptx) < 100000) {
2998 [ + - ]: 4370 : AddToCompactExtraTransactions(ptx);
2999 : : }
3000 [ + + ]: 14227 : for (const Txid& parent_txid : unique_parents) {
3001 [ + - + - ]: 9828 : if (peer) AddKnownTx(*peer, parent_txid.ToUint256());
3002 : : }
3003 : :
3004 [ + - ]: 4399 : return package_to_validate;
3005 [ + - ]: 8798 : }
3006 : :
3007 : 0 : void PeerManagerImpl::ProcessValidTx(NodeId nodeid, const CTransactionRef& tx, const std::list<CTransactionRef>& replaced_transactions)
3008 : : {
3009 : 0 : AssertLockNotHeld(m_peer_mutex);
3010 : 0 : AssertLockHeld(g_msgproc_mutex);
3011 : 0 : AssertLockHeld(m_tx_download_mutex);
3012 : :
3013 : 0 : m_txdownloadman.MempoolAcceptedTx(tx);
3014 : :
3015 [ # # # # : 0 : LogDebug(BCLog::MEMPOOL, "AcceptToMemoryPool: peer=%d: accepted %s (wtxid=%s) (poolsz %u txn, %u kB)\n",
# # ]
3016 : : nodeid,
3017 : : tx->GetHash().ToString(),
3018 : : tx->GetWitnessHash().ToString(),
3019 : : m_mempool.size(), m_mempool.DynamicMemoryUsage() / 1000);
3020 : :
3021 : 0 : RelayTransaction(tx->GetHash(), tx->GetWitnessHash());
3022 : :
3023 [ # # ]: 0 : for (const CTransactionRef& removedTx : replaced_transactions) {
3024 : 0 : AddToCompactExtraTransactions(removedTx);
3025 : : }
3026 : 0 : }
3027 : :
3028 : 0 : void PeerManagerImpl::ProcessPackageResult(const node::PackageToValidate& package_to_validate, const PackageMempoolAcceptResult& package_result)
3029 : : {
3030 : 0 : AssertLockNotHeld(m_peer_mutex);
3031 : 0 : AssertLockHeld(g_msgproc_mutex);
3032 : 0 : AssertLockHeld(m_tx_download_mutex);
3033 : :
3034 : 0 : const auto& package = package_to_validate.m_txns;
3035 : 0 : const auto& senders = package_to_validate.m_senders;
3036 : :
3037 [ # # ]: 0 : if (package_result.m_state.IsInvalid()) {
3038 : 0 : m_txdownloadman.MempoolRejectedPackage(package);
3039 : : }
3040 : : // We currently only expect to process 1-parent-1-child packages. Remove if this changes.
3041 [ # # # # ]: 0 : if (!Assume(package.size() == 2)) return;
3042 : :
3043 : : // Iterate backwards to erase in-package descendants from the orphanage before they become
3044 : : // relevant in AddChildrenToWorkSet.
3045 : 0 : auto package_iter = package.rbegin();
3046 : 0 : auto senders_iter = senders.rbegin();
3047 [ # # ]: 0 : while (package_iter != package.rend()) {
3048 : 0 : const auto& tx = *package_iter;
3049 : 0 : const NodeId nodeid = *senders_iter;
3050 : 0 : const auto it_result{package_result.m_tx_results.find(tx->GetWitnessHash())};
3051 : :
3052 : : // It is not guaranteed that a result exists for every transaction.
3053 [ # # ]: 0 : if (it_result != package_result.m_tx_results.end()) {
3054 [ # # # # ]: 0 : const auto& tx_result = it_result->second;
3055 [ # # # # ]: 0 : switch (tx_result.m_result_type) {
3056 : 0 : case MempoolAcceptResult::ResultType::VALID:
3057 : 0 : {
3058 : 0 : ProcessValidTx(nodeid, tx, tx_result.m_replaced_transactions);
3059 : 0 : break;
3060 : : }
3061 : 0 : case MempoolAcceptResult::ResultType::INVALID:
3062 : 0 : case MempoolAcceptResult::ResultType::DIFFERENT_WITNESS:
3063 : 0 : {
3064 : : // Don't add to vExtraTxnForCompact, as these transactions should have already been
3065 : : // added there when added to the orphanage or rejected for TX_RECONSIDERABLE.
3066 : : // This should be updated if package submission is ever used for transactions
3067 : : // that haven't already been validated before.
3068 [ # # ]: 0 : ProcessInvalidTx(nodeid, tx, tx_result.m_state, /*first_time_failure=*/false);
3069 : 0 : break;
3070 : : }
3071 : 0 : case MempoolAcceptResult::ResultType::MEMPOOL_ENTRY:
3072 : 0 : {
3073 : : // AlreadyHaveTx() should be catching transactions that are already in mempool.
3074 : 0 : Assume(false);
3075 : 0 : break;
3076 : : }
3077 : : }
3078 : : }
3079 : 0 : package_iter++;
3080 : 0 : senders_iter++;
3081 : : }
3082 : : }
3083 : :
3084 : : // NOTE: the orphan processing used to be uninterruptible and quadratic, which could allow a peer to stall the node for
3085 : : // hours with specially crafted transactions. See https://bitcoincore.org/en/2024/07/03/disclose-orphan-dos.
3086 : 621551 : bool PeerManagerImpl::ProcessOrphanTx(Peer& peer)
3087 : : {
3088 : 621551 : AssertLockHeld(g_msgproc_mutex);
3089 [ + - ]: 621551 : LOCK2(::cs_main, m_tx_download_mutex);
3090 : :
3091 : 621551 : CTransactionRef porphanTx = nullptr;
3092 : :
3093 [ + - - + : 621551 : while (CTransactionRef porphanTx = m_txdownloadman.GetTxToReconsider(peer.m_id)) {
- - ]
3094 [ # # ]: 0 : const MempoolAcceptResult result = m_chainman.ProcessTransaction(porphanTx);
3095 : 0 : const TxValidationState& state = result.m_state;
3096 [ # # ]: 0 : const Txid& orphanHash = porphanTx->GetHash();
3097 [ # # ]: 0 : const Wtxid& orphan_wtxid = porphanTx->GetWitnessHash();
3098 : :
3099 [ # # ]: 0 : if (result.m_result_type == MempoolAcceptResult::ResultType::VALID) {
3100 [ # # # # : 0 : LogDebug(BCLog::TXPACKAGES, " accepted orphan tx %s (wtxid=%s)\n", orphanHash.ToString(), orphan_wtxid.ToString());
# # # # #
# ]
3101 [ # # ]: 0 : ProcessValidTx(peer.m_id, porphanTx, result.m_replaced_transactions);
3102 : : return true;
3103 [ # # ]: 0 : } else if (state.GetResult() != TxValidationResult::TX_MISSING_INPUTS) {
3104 [ # # # # : 0 : LogDebug(BCLog::TXPACKAGES, " invalid orphan tx %s (wtxid=%s) from peer=%d. %s\n",
# # # # #
# # # ]
3105 : : orphanHash.ToString(),
3106 : : orphan_wtxid.ToString(),
3107 : : peer.m_id,
3108 : : state.ToString());
3109 : :
3110 [ # # # # : 0 : if (Assume(state.IsInvalid() &&
# # # # #
# # # ]
3111 : : state.GetResult() != TxValidationResult::TX_UNKNOWN &&
3112 : : state.GetResult() != TxValidationResult::TX_NO_MEMPOOL &&
3113 : : state.GetResult() != TxValidationResult::TX_RESULT_UNSET)) {
3114 [ # # ]: 0 : ProcessInvalidTx(peer.m_id, porphanTx, state, /*first_time_failure=*/false);
3115 : : }
3116 : 0 : return true;
3117 : : }
3118 [ # # ]: 0 : }
3119 : :
3120 : 621551 : return false;
3121 [ + - + - : 1864653 : }
- - ]
3122 : :
3123 : 42 : bool PeerManagerImpl::PrepareBlockFilterRequest(CNode& node, Peer& peer,
3124 : : BlockFilterType filter_type, uint32_t start_height,
3125 : : const uint256& stop_hash, uint32_t max_height_diff,
3126 : : const CBlockIndex*& stop_index,
3127 : : BlockFilterIndex*& filter_index)
3128 : : {
3129 : 84 : const bool supported_filter_type =
3130 [ + + ]: 42 : (filter_type == BlockFilterType::BASIC &&
3131 [ + + ]: 35 : (peer.m_our_services & NODE_COMPACT_FILTERS));
3132 : 42 : if (!supported_filter_type) {
3133 [ - + - - ]: 14 : LogDebug(BCLog::NET, "peer requested unsupported block filter type: %d, %s\n",
3134 : : static_cast<uint8_t>(filter_type), node.DisconnectMsg(fLogIPs));
3135 : 14 : node.fDisconnect = true;
3136 : 14 : return false;
3137 : : }
3138 : :
3139 : 28 : {
3140 : 28 : LOCK(cs_main);
3141 [ + - ]: 28 : stop_index = m_chainman.m_blockman.LookupBlockIndex(stop_hash);
3142 : :
3143 : : // Check that the stop block exists and the peer would be allowed to fetch it.
3144 [ + + + - : 28 : if (!stop_index || !BlockRequestAllowed(stop_index)) {
+ - ]
3145 [ + - - + : 7 : LogDebug(BCLog::NET, "peer requested invalid block hash: %s, %s\n",
- - - - -
- ]
3146 : : stop_hash.ToString(), node.DisconnectMsg(fLogIPs));
3147 [ + - ]: 7 : node.fDisconnect = true;
3148 [ + - ]: 7 : return false;
3149 : : }
3150 : 7 : }
3151 : :
3152 : 21 : uint32_t stop_height = stop_index->nHeight;
3153 [ + + ]: 21 : if (start_height > stop_height) {
3154 [ - + - - ]: 2 : LogDebug(BCLog::NET, "peer sent invalid getcfilters/getcfheaders with "
3155 : : "start height %d and stop height %d, %s\n",
3156 : : start_height, stop_height, node.DisconnectMsg(fLogIPs));
3157 : 2 : node.fDisconnect = true;
3158 : 2 : return false;
3159 : : }
3160 [ - + ]: 19 : if (stop_height - start_height >= max_height_diff) {
3161 [ # # # # ]: 0 : LogDebug(BCLog::NET, "peer requested too many cfilters/cfheaders: %d / %d, %s\n",
3162 : : stop_height - start_height + 1, max_height_diff, node.DisconnectMsg(fLogIPs));
3163 : 0 : node.fDisconnect = true;
3164 : 0 : return false;
3165 : : }
3166 : :
3167 : 19 : filter_index = GetBlockFilterIndex(filter_type);
3168 [ + - ]: 19 : if (!filter_index) {
3169 [ - + ]: 19 : LogDebug(BCLog::NET, "Filter index for supported type %s not found\n", BlockFilterTypeName(filter_type));
3170 : 19 : return false;
3171 : : }
3172 : :
3173 : : return true;
3174 : : }
3175 : :
3176 : 44 : void PeerManagerImpl::ProcessGetCFilters(CNode& node, Peer& peer, DataStream& vRecv)
3177 : : {
3178 : 44 : uint8_t filter_type_ser;
3179 : 44 : uint32_t start_height;
3180 : 44 : uint256 stop_hash;
3181 : :
3182 : 44 : vRecv >> filter_type_ser >> start_height >> stop_hash;
3183 : :
3184 : 25 : const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser);
3185 : :
3186 : 25 : const CBlockIndex* stop_index;
3187 : 25 : BlockFilterIndex* filter_index;
3188 [ - + ]: 25 : if (!PrepareBlockFilterRequest(node, peer, filter_type, start_height, stop_hash,
3189 : : MAX_GETCFILTERS_SIZE, stop_index, filter_index)) {
3190 : : return;
3191 : : }
3192 : :
3193 : 0 : std::vector<BlockFilter> filters;
3194 [ # # # # ]: 0 : if (!filter_index->LookupFilterRange(start_height, stop_index, filters)) {
3195 [ # # # # : 0 : LogDebug(BCLog::NET, "Failed to find block filter in index: filter_type=%s, start_height=%d, stop_hash=%s\n",
# # # # #
# ]
3196 : : BlockFilterTypeName(filter_type), start_height, stop_hash.ToString());
3197 : 0 : return;
3198 : : }
3199 : :
3200 [ # # ]: 0 : for (const auto& filter : filters) {
3201 [ # # # # ]: 0 : MakeAndPushMessage(node, NetMsgType::CFILTER, filter);
3202 : : }
3203 : 0 : }
3204 : :
3205 : 75 : void PeerManagerImpl::ProcessGetCFHeaders(CNode& node, Peer& peer, DataStream& vRecv)
3206 : : {
3207 : 75 : uint8_t filter_type_ser;
3208 : 75 : uint32_t start_height;
3209 : 75 : uint256 stop_hash;
3210 : :
3211 : 75 : vRecv >> filter_type_ser >> start_height >> stop_hash;
3212 : :
3213 : 7 : const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser);
3214 : :
3215 : 7 : const CBlockIndex* stop_index;
3216 : 7 : BlockFilterIndex* filter_index;
3217 [ - + ]: 7 : if (!PrepareBlockFilterRequest(node, peer, filter_type, start_height, stop_hash,
3218 : : MAX_GETCFHEADERS_SIZE, stop_index, filter_index)) {
3219 : : return;
3220 : : }
3221 : :
3222 : 0 : uint256 prev_header;
3223 [ # # ]: 0 : if (start_height > 0) {
3224 : 0 : const CBlockIndex* const prev_block =
3225 : 0 : stop_index->GetAncestor(static_cast<int>(start_height - 1));
3226 [ # # ]: 0 : if (!filter_index->LookupFilterHeader(prev_block, prev_header)) {
3227 [ # # # # : 0 : LogDebug(BCLog::NET, "Failed to find block filter header in index: filter_type=%s, block_hash=%s\n",
# # ]
3228 : : BlockFilterTypeName(filter_type), prev_block->GetBlockHash().ToString());
3229 : 0 : return;
3230 : : }
3231 : : }
3232 : :
3233 : 0 : std::vector<uint256> filter_hashes;
3234 [ # # # # ]: 0 : if (!filter_index->LookupFilterHashRange(start_height, stop_index, filter_hashes)) {
3235 [ # # # # : 0 : LogDebug(BCLog::NET, "Failed to find block filter hashes in index: filter_type=%s, start_height=%d, stop_hash=%s\n",
# # # # #
# ]
3236 : : BlockFilterTypeName(filter_type), start_height, stop_hash.ToString());
3237 : 0 : return;
3238 : : }
3239 : :
3240 [ # # # # ]: 0 : MakeAndPushMessage(node, NetMsgType::CFHEADERS,
3241 : : filter_type_ser,
3242 : 0 : stop_index->GetBlockHash(),
3243 : : prev_header,
3244 : : filter_hashes);
3245 : 0 : }
3246 : :
3247 : 38 : void PeerManagerImpl::ProcessGetCFCheckPt(CNode& node, Peer& peer, DataStream& vRecv)
3248 : : {
3249 : 38 : uint8_t filter_type_ser;
3250 : 38 : uint256 stop_hash;
3251 : :
3252 : 38 : vRecv >> filter_type_ser >> stop_hash;
3253 : :
3254 : 10 : const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser);
3255 : :
3256 : 10 : const CBlockIndex* stop_index;
3257 : 10 : BlockFilterIndex* filter_index;
3258 [ - + ]: 10 : if (!PrepareBlockFilterRequest(node, peer, filter_type, /*start_height=*/0, stop_hash,
3259 : : /*max_height_diff=*/std::numeric_limits<uint32_t>::max(),
3260 : : stop_index, filter_index)) {
3261 : : return;
3262 : : }
3263 : :
3264 : 0 : std::vector<uint256> headers(stop_index->nHeight / CFCHECKPT_INTERVAL);
3265 : :
3266 : : // Populate headers.
3267 : 0 : const CBlockIndex* block_index = stop_index;
3268 [ # # # # ]: 0 : for (int i = headers.size() - 1; i >= 0; i--) {
3269 : 0 : int height = (i + 1) * CFCHECKPT_INTERVAL;
3270 [ # # ]: 0 : block_index = block_index->GetAncestor(height);
3271 : :
3272 [ # # # # ]: 0 : if (!filter_index->LookupFilterHeader(block_index, headers[i])) {
3273 [ # # # # : 0 : LogDebug(BCLog::NET, "Failed to find block filter header in index: filter_type=%s, block_hash=%s\n",
# # # # #
# ]
3274 : : BlockFilterTypeName(filter_type), block_index->GetBlockHash().ToString());
3275 : 0 : return;
3276 : : }
3277 : : }
3278 : :
3279 [ # # # # ]: 0 : MakeAndPushMessage(node, NetMsgType::CFCHECKPT,
3280 : : filter_type_ser,
3281 : 0 : stop_index->GetBlockHash(),
3282 : : headers);
3283 : 0 : }
3284 : :
3285 : 9600 : void PeerManagerImpl::ProcessBlock(CNode& node, const std::shared_ptr<const CBlock>& block, bool force_processing, bool min_pow_checked)
3286 : : {
3287 : 9600 : bool new_block{false};
3288 : 9600 : m_chainman.ProcessNewBlock(block, force_processing, min_pow_checked, &new_block);
3289 [ - + ]: 9600 : if (new_block) {
3290 : 0 : node.m_last_block_time = GetTime<std::chrono::seconds>();
3291 : : // In case this block came from a different peer than we requested
3292 : : // from, we can erase the block request now anyway (as we just stored
3293 : : // this block to disk).
3294 : 0 : LOCK(cs_main);
3295 [ # # # # ]: 0 : RemoveBlockRequest(block->GetHash(), std::nullopt);
3296 : 0 : } else {
3297 : 9600 : LOCK(cs_main);
3298 [ + - + - ]: 19200 : mapBlockSource.erase(block->GetHash());
3299 : 9600 : }
3300 : 9600 : }
3301 : :
3302 : 43 : void PeerManagerImpl::ProcessCompactBlockTxns(CNode& pfrom, Peer& peer, const BlockTransactions& block_transactions)
3303 : : {
3304 : 43 : std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
3305 : 43 : bool fBlockRead{false};
3306 : 43 : {
3307 [ + - ]: 43 : LOCK(cs_main);
3308 : :
3309 : 43 : auto range_flight = mapBlocksInFlight.equal_range(block_transactions.blockhash);
3310 : 43 : size_t already_in_flight = std::distance(range_flight.first, range_flight.second);
3311 : 43 : bool requested_block_from_this_peer{false};
3312 : :
3313 : : // Multimap ensures ordering of outstanding requests. It's either empty or first in line.
3314 [ - + - - ]: 43 : bool first_in_flight = already_in_flight == 0 || (range_flight.first->second.first == pfrom.GetId());
3315 : :
3316 [ - + ]: 43 : while (range_flight.first != range_flight.second) {
3317 [ # # ]: 0 : auto [node_id, block_it] = range_flight.first->second;
3318 [ # # # # ]: 0 : if (node_id == pfrom.GetId() && block_it->partialBlock) {
3319 : : requested_block_from_this_peer = true;
3320 : : break;
3321 : : }
3322 : 0 : range_flight.first++;
3323 : : }
3324 : :
3325 [ + - ]: 43 : if (!requested_block_from_this_peer) {
3326 [ + - - + : 43 : LogDebug(BCLog::NET, "Peer %d sent us block transactions for block we weren't expecting\n", pfrom.GetId());
- - ]
3327 : 43 : return;
3328 : : }
3329 : :
3330 [ # # ]: 0 : PartiallyDownloadedBlock& partialBlock = *range_flight.first->second.second->partialBlock;
3331 : :
3332 [ # # ]: 0 : if (partialBlock.header.IsNull()) {
3333 : : // It is possible for the header to be empty if a previous call to FillBlock wiped the header, but left
3334 : : // the PartiallyDownloadedBlock pointer around (i.e. did not call RemoveBlockRequest). In this case, we
3335 : : // should not call LookupBlockIndex below.
3336 [ # # ]: 0 : RemoveBlockRequest(block_transactions.blockhash, pfrom.GetId());
3337 [ # # # # ]: 0 : Misbehaving(peer, "previous compact block reconstruction attempt failed");
3338 [ # # # # : 0 : LogDebug(BCLog::NET, "Peer %d sent compact block transactions multiple times", pfrom.GetId());
# # ]
3339 : 0 : return;
3340 : : }
3341 : :
3342 : : // We should not have gotten this far in compact block processing unless it's attached to a known header
3343 [ # # # # ]: 0 : const CBlockIndex* prev_block{Assume(m_chainman.m_blockman.LookupBlockIndex(partialBlock.header.hashPrevBlock))};
3344 [ # # ]: 0 : ReadStatus status = partialBlock.FillBlock(*pblock, block_transactions.txn,
3345 : 0 : /*segwit_active=*/DeploymentActiveAfter(prev_block, m_chainman, Consensus::DEPLOYMENT_SEGWIT));
3346 [ # # ]: 0 : if (status == READ_STATUS_INVALID) {
3347 [ # # ]: 0 : RemoveBlockRequest(block_transactions.blockhash, pfrom.GetId()); // Reset in-flight state in case Misbehaving does not result in a disconnect
3348 [ # # # # ]: 0 : Misbehaving(peer, "invalid compact block/non-matching block transactions");
3349 : 0 : return;
3350 [ # # ]: 0 : } else if (status == READ_STATUS_FAILED) {
3351 [ # # ]: 0 : if (first_in_flight) {
3352 : : // Might have collided, fall back to getdata now :(
3353 : : // We keep the failed partialBlock to disallow processing another compact block announcement from the same
3354 : : // peer for the same block. We let the full block download below continue under the same m_downloading_since
3355 : : // timer.
3356 : 0 : std::vector<CInv> invs;
3357 [ # # ]: 0 : invs.emplace_back(MSG_BLOCK | GetFetchFlags(peer), block_transactions.blockhash);
3358 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, invs);
3359 : 0 : } else {
3360 [ # # ]: 0 : RemoveBlockRequest(block_transactions.blockhash, pfrom.GetId());
3361 [ # # # # : 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());
# # ]
3362 : 0 : return;
3363 : : }
3364 : : } else {
3365 : : // Block is okay for further processing
3366 [ # # ]: 0 : RemoveBlockRequest(block_transactions.blockhash, pfrom.GetId()); // it is now an empty pointer
3367 : 0 : fBlockRead = true;
3368 : : // mapBlockSource is used for potentially punishing peers and
3369 : : // updating which peers send us compact blocks, so the race
3370 : : // between here and cs_main in ProcessNewBlock is fine.
3371 : : // BIP 152 permits peers to relay compact blocks after validating
3372 : : // the header only; we should not punish peers if the block turns
3373 : : // out to be invalid.
3374 [ # # ]: 0 : mapBlockSource.emplace(block_transactions.blockhash, std::make_pair(pfrom.GetId(), false));
3375 : : }
3376 : 43 : } // Don't hold cs_main when we call into ProcessNewBlock
3377 [ # # ]: 0 : if (fBlockRead) {
3378 : : // Since we requested this block (it was in mapBlocksInFlight), force it to be processed,
3379 : : // even if it would not be a candidate for new tip (missing previous block, chain not long enough, etc)
3380 : : // This bypasses some anti-DoS logic in AcceptBlock (eg to prevent
3381 : : // disk-space attacks), but this should be safe due to the
3382 : : // protections in the compact block handler -- see related comment
3383 : : // in compact block optimistic reconstruction handling.
3384 [ # # # # ]: 0 : ProcessBlock(pfrom, pblock, /*force_processing=*/true, /*min_pow_checked=*/true);
3385 : : }
3386 : : return;
3387 : 43 : }
3388 : :
3389 : 890 : void PeerManagerImpl::LogBlockHeader(const CBlockIndex& index, const CNode& peer, bool via_compact_block) {
3390 : : // To prevent log spam, this function should only be called after it was determined that a
3391 : : // header is both new and valid.
3392 : : //
3393 : : // These messages are valuable for detecting potential selfish mining behavior;
3394 : : // if multiple displacing headers are seen near simultaneously across many
3395 : : // nodes in the network, this might be an indication of selfish mining.
3396 : : // In addition it can be used to identify peers which send us a header, but
3397 : : // don't followup with a complete and valid (compact) block.
3398 : : // Having this log by default when not in IBD ensures broad availability of
3399 : : // this data in case investigation is merited.
3400 : 890 : const auto msg = strprintf(
3401 : : "Saw new %sheader hash=%s height=%d peer=%d%s",
3402 [ + + ]: 890 : via_compact_block ? "cmpctblock " : "",
3403 [ + - ]: 1780 : index.GetBlockHash().ToString(),
3404 : 890 : index.nHeight,
3405 : 890 : peer.GetId(),
3406 : 890 : peer.LogIP(fLogIPs)
3407 [ + - ]: 890 : );
3408 [ + - + + ]: 890 : if (m_chainman.IsInitialBlockDownload()) {
3409 [ + - - + : 806 : LogDebug(BCLog::VALIDATION, "%s", msg);
- - ]
3410 : : } else {
3411 [ + - ]: 84 : LogInfo("%s", msg);
3412 : : }
3413 : 890 : }
3414 : :
3415 : 78519 : void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type, DataStream& vRecv,
3416 : : const std::chrono::microseconds time_received,
3417 : : const std::atomic<bool>& interruptMsgProc)
3418 : : {
3419 : 78519 : AssertLockHeld(g_msgproc_mutex);
3420 : :
3421 [ - + - - : 78519 : LogDebug(BCLog::NET, "received: %s (%u bytes) peer=%d\n", SanitizeString(msg_type), vRecv.size(), pfrom.GetId());
- - - - ]
3422 : :
3423 : 78519 : PeerRef peer = GetPeerRef(pfrom.GetId());
3424 [ + - ]: 78519 : if (peer == nullptr) return;
3425 : :
3426 [ + + ]: 78519 : if (msg_type == NetMsgType::VERSION) {
3427 [ + + ]: 12743 : if (pfrom.nVersion != 0) {
3428 [ + - - + : 434 : LogDebug(BCLog::NET, "redundant version message from peer=%d\n", pfrom.GetId());
- - ]
3429 : 434 : return;
3430 : : }
3431 : :
3432 : 12309 : int64_t nTime;
3433 [ + - ]: 12309 : CService addrMe;
3434 : 12309 : uint64_t nNonce = 1;
3435 : 12309 : ServiceFlags nServices;
3436 : 12309 : int nVersion;
3437 [ + + ]: 12309 : std::string cleanSubVer;
3438 : 12309 : int starting_height = -1;
3439 : 12309 : bool fRelay = true;
3440 : :
3441 [ + + + + : 12309 : vRecv >> nVersion >> Using<CustomUintFormatter<8>>(nServices) >> nTime;
+ + ]
3442 [ + + ]: 11106 : if (nTime < 0) {
3443 : 846 : nTime = 0;
3444 : : }
3445 [ + + ]: 11106 : vRecv.ignore(8); // Ignore the addrMe service bits sent by the peer
3446 [ + + ]: 10961 : vRecv >> CNetAddr::V1(addrMe);
3447 [ + + ]: 10599 : if (!pfrom.IsInboundConn())
3448 : : {
3449 : : // Overwrites potentially existing services. In contrast to this,
3450 : : // unvalidated services received via gossip relay in ADDR/ADDRV2
3451 : : // messages are only ever added but cannot replace existing ones.
3452 [ + - ]: 5882 : m_addrman.SetServices(pfrom.addr, nServices);
3453 : : }
3454 [ + + + + ]: 10599 : if (pfrom.ExpectServicesFromConn() && !HasAllDesirableServiceFlags(nServices))
3455 : : {
3456 [ + - - + : 474 : LogDebug(BCLog::NET, "peer does not offer the expected services (%08x offered, %08x expected), %s\n",
- - - - ]
3457 : : nServices,
3458 : : GetDesirableServiceFlags(nServices),
3459 : : pfrom.DisconnectMsg(fLogIPs));
3460 : 474 : pfrom.fDisconnect = true;
3461 : 474 : return;
3462 : : }
3463 : :
3464 [ + + ]: 10125 : if (nVersion < MIN_PEER_PROTO_VERSION) {
3465 : : // disconnect from peers older than this proto version
3466 [ + - - + : 14 : LogDebug(BCLog::NET, "peer using obsolete version %i, %s\n", nVersion, pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3467 : 14 : pfrom.fDisconnect = true;
3468 : 14 : return;
3469 : : }
3470 : :
3471 [ - + + + ]: 10111 : if (!vRecv.empty()) {
3472 : : // The version message includes information about the sending node which we don't use:
3473 : : // - 8 bytes (service bits)
3474 : : // - 16 bytes (ipv6 address)
3475 : : // - 2 bytes (port)
3476 [ + + ]: 9610 : vRecv.ignore(26);
3477 [ + + ]: 9231 : vRecv >> nNonce;
3478 : : }
3479 [ - + + + ]: 9644 : if (!vRecv.empty()) {
3480 [ + + ]: 9104 : std::string strSubVer;
3481 [ + + ]: 9104 : vRecv >> LIMITED_STRING(strSubVer, MAX_SUBVERSION_LENGTH);
3482 [ - + + - ]: 8300 : cleanSubVer = SanitizeString(strSubVer);
3483 : 9104 : }
3484 [ - + + + ]: 8840 : if (!vRecv.empty()) {
3485 [ + + ]: 8287 : vRecv >> starting_height;
3486 : : }
3487 [ - + + + ]: 8569 : if (!vRecv.empty())
3488 [ + - ]: 8009 : vRecv >> fRelay;
3489 : : // Disconnect if we connected to ourself
3490 [ + + + - : 8569 : if (pfrom.IsInboundConn() && !m_connman.CheckIncomingNonce(nNonce))
+ + ]
3491 : : {
3492 [ + - + - ]: 115 : LogPrintf("connected to self at %s, disconnecting\n", pfrom.addr.ToStringAddrPort());
3493 : 115 : pfrom.fDisconnect = true;
3494 : 115 : return;
3495 : : }
3496 : :
3497 [ + + + - : 8454 : if (pfrom.IsInboundConn() && addrMe.IsRoutable())
+ + ]
3498 : : {
3499 [ + - ]: 160 : SeenLocal(addrMe);
3500 : : }
3501 : :
3502 : : // Inbound peers send us their version message when they connect.
3503 : : // We send our version message in response.
3504 [ + + ]: 8454 : if (pfrom.IsInboundConn()) {
3505 [ + - ]: 4227 : PushNodeVersion(pfrom, *peer);
3506 : : }
3507 : :
3508 : : // Change version
3509 [ + + ]: 8454 : const int greatest_common_version = std::min(nVersion, PROTOCOL_VERSION);
3510 [ + - ]: 8454 : pfrom.SetCommonVersion(greatest_common_version);
3511 [ + + ]: 8454 : pfrom.nVersion = nVersion;
3512 : :
3513 [ + + ]: 8454 : if (greatest_common_version >= WTXID_RELAY_VERSION) {
3514 [ + - + - ]: 7148 : MakeAndPushMessage(pfrom, NetMsgType::WTXIDRELAY);
3515 : : }
3516 : :
3517 : : // Signal ADDRv2 support (BIP155).
3518 : 7148 : if (greatest_common_version >= 70016) {
3519 : : // BIP155 defines addrv2 and sendaddrv2 for all protocol versions, but some
3520 : : // implementations reject messages they don't know. As a courtesy, don't send
3521 : : // it to nodes with a version before 70016, as no software is known to support
3522 : : // BIP155 that doesn't announce at least that protocol version number.
3523 [ + - + - ]: 14296 : MakeAndPushMessage(pfrom, NetMsgType::SENDADDRV2);
3524 : : }
3525 : :
3526 [ + - ]: 8454 : pfrom.m_has_all_wanted_services = HasAllDesirableServiceFlags(nServices);
3527 [ + - ]: 8454 : peer->m_their_services = nServices;
3528 [ + - ]: 8454 : pfrom.SetAddrLocal(addrMe);
3529 : 8454 : {
3530 [ + - ]: 8454 : LOCK(pfrom.m_subver_mutex);
3531 [ + - + - ]: 16908 : pfrom.cleanSubVer = cleanSubVer;
3532 : 0 : }
3533 [ + + ]: 8454 : peer->m_starting_height = starting_height;
3534 : :
3535 : : // Only initialize the Peer::TxRelay m_relay_txs data structure if:
3536 : : // - this isn't an outbound block-relay-only connection, and
3537 : : // - this isn't an outbound feeler connection, and
3538 : : // - fRelay=true (the peer wishes to receive transaction announcements)
3539 : : // or we're offering NODE_BLOOM to this peer. NODE_BLOOM means that
3540 : : // the peer may turn on transaction relay later.
3541 [ + + ]: 8454 : if (!pfrom.IsBlockOnlyConn() &&
3542 [ + + + + : 8454 : !pfrom.IsFeelerConn() &&
+ + ]
3543 [ + + ]: 2375 : (fRelay || (peer->m_our_services & NODE_BLOOM))) {
3544 [ + - ]: 6128 : auto* const tx_relay = peer->SetTxRelay();
3545 : 6128 : {
3546 [ + - ]: 6128 : LOCK(tx_relay->m_bloom_filter_mutex);
3547 [ + - ]: 6128 : tx_relay->m_relay_txs = fRelay; // set to true after we get the first filter* message
3548 : 6128 : }
3549 [ + + ]: 6128 : if (fRelay) pfrom.m_relays_txs = true;
3550 : : }
3551 : :
3552 [ + + + + ]: 8454 : if (greatest_common_version >= WTXID_RELAY_VERSION && m_txreconciliation) {
3553 : : // Per BIP-330, we announce txreconciliation support if:
3554 : : // - protocol version per the peer's VERSION message supports WTXID_RELAY;
3555 : : // - transaction relay is supported per the peer's VERSION message
3556 : : // - this is not a block-relay-only connection and not a feeler
3557 : : // - this is not an addr fetch connection;
3558 : : // - we are not in -blocksonly mode.
3559 [ + - ]: 5765 : const auto* tx_relay = peer->GetTxRelay();
3560 [ + - + + : 9192 : if (tx_relay && WITH_LOCK(tx_relay->m_bloom_filter_mutex, return tx_relay->m_relay_txs) &&
+ - ]
3561 [ + + + + : 9538 : !pfrom.IsAddrFetchConn() && !m_opts.ignore_incoming_txs) {
+ - ]
3562 [ + - ]: 3630 : const uint64_t recon_salt = m_txreconciliation->PreRegisterPeer(pfrom.GetId());
3563 [ + - + - ]: 7260 : MakeAndPushMessage(pfrom, NetMsgType::SENDTXRCNCL,
3564 : : TXRECONCILIATION_VERSION, recon_salt);
3565 : : }
3566 : : }
3567 : :
3568 [ + - + - ]: 8454 : MakeAndPushMessage(pfrom, NetMsgType::VERACK);
3569 : :
3570 : : // Potentially mark this peer as a preferred download peer.
3571 : 8454 : {
3572 [ + - ]: 8454 : LOCK(cs_main);
3573 : 8454 : CNodeState* state = State(pfrom.GetId());
3574 [ + + + + : 8454 : state->fPreferredDownload = (!pfrom.IsInboundConn() || pfrom.HasPermission(NetPermissionFlags::NoBan)) && !pfrom.IsAddrFetchConn() && CanServeBlocks(*peer);
+ + + + ]
3575 [ + - ]: 8454 : m_num_preferred_download_peers += state->fPreferredDownload;
3576 : 8454 : }
3577 : :
3578 : : // Attempt to initialize address relay for outbound peers and use result
3579 : : // to decide whether to send GETADDR, so that we don't send it to
3580 : : // inbound or outbound block-relay-only peers.
3581 : 8454 : bool send_getaddr{false};
3582 [ + + ]: 8454 : if (!pfrom.IsInboundConn()) {
3583 [ + - ]: 4227 : send_getaddr = SetupAddressRelay(pfrom, *peer);
3584 : : }
3585 [ + + ]: 4227 : if (send_getaddr) {
3586 : : // Do a one-time address fetch to help populate/update our addrman.
3587 : : // If we're starting up for the first time, our addrman may be pretty
3588 : : // empty, so this mechanism is important to help us connect to the network.
3589 : : // We skip this for block-relay-only peers. We want to avoid
3590 : : // potentially leaking addr information and we do not want to
3591 : : // indicate to the peer that we will participate in addr relay.
3592 [ + - + - ]: 3596 : MakeAndPushMessage(pfrom, NetMsgType::GETADDR);
3593 : 3596 : peer->m_getaddr_sent = true;
3594 : : // When requesting a getaddr, accept an additional MAX_ADDR_TO_SEND addresses in response
3595 : : // (bypassing the MAX_ADDR_PROCESSING_TOKEN_BUCKET limit).
3596 : 3596 : peer->m_addr_token_bucket += MAX_ADDR_TO_SEND;
3597 : : }
3598 : :
3599 [ + + ]: 8454 : if (!pfrom.IsInboundConn()) {
3600 : : // For non-inbound connections, we update the addrman to record
3601 : : // connection success so that addrman will have an up-to-date
3602 : : // notion of which peers are online and available.
3603 : : //
3604 : : // While we strive to not leak information about block-relay-only
3605 : : // connections via the addrman, not moving an address to the tried
3606 : : // table is also potentially detrimental because new-table entries
3607 : : // are subject to eviction in the event of addrman collisions. We
3608 : : // mitigate the information-leak by never calling
3609 : : // AddrMan::Connected() on block-relay-only peers; see
3610 : : // FinalizeNode().
3611 : : //
3612 : : // This moves an address from New to Tried table in Addrman,
3613 : : // resolves tried-table collisions, etc.
3614 [ + - ]: 4227 : m_addrman.Good(pfrom.addr);
3615 : : }
3616 : :
3617 [ + - ]: 8454 : const auto mapped_as{m_connman.GetMappedAS(pfrom.addr)};
3618 [ + - - + : 8454 : LogDebug(BCLog::NET, "receive version message: %s: version %d, blocks=%d, us=%s, txrelay=%d, peer=%d%s%s\n",
- - - - -
- - - - -
- - ]
3619 : : cleanSubVer, pfrom.nVersion,
3620 : : peer->m_starting_height, addrMe.ToStringAddrPort(), fRelay, pfrom.GetId(),
3621 : : pfrom.LogIP(fLogIPs), (mapped_as ? strprintf(", mapped_as=%d", mapped_as) : ""));
3622 : :
3623 : 8454 : peer->m_time_offset = NodeSeconds{std::chrono::seconds{nTime}} - Now<NodeSeconds>();
3624 [ + + ]: 8454 : if (!pfrom.IsInboundConn()) {
3625 : : // Don't use timedata samples from inbound peers to make it
3626 : : // harder for others to create false warnings about our clock being out of sync.
3627 [ + - ]: 4227 : m_outbound_time_offsets.Add(peer->m_time_offset);
3628 [ + - ]: 4227 : m_outbound_time_offsets.WarnIfOutOfSync();
3629 : : }
3630 : :
3631 : : // If the peer is old enough to have the old alert system, send it the final alert.
3632 [ + + ]: 8454 : if (greatest_common_version <= 70012) {
3633 : 1301 : constexpr auto finalAlert{"60010000000000000000000000ffffff7f00000000ffffff7ffeffff7f01ffffff7f00000000ffffff7f00ffffff7f002f555247454e543a20416c657274206b657920636f6d70726f6d697365642c2075706772616465207265717569726564004630440220653febd6410f470f6bae11cad19c48413becb1ac2c17f908fd0fd53bdc3abd5202206d0e9c96fe88d4a0f01ed9dedae2b6f9e00da94cad0fecaae66ecf689bf71b50"_hex};
3634 [ + - + - ]: 2602 : MakeAndPushMessage(pfrom, "alert", finalAlert);
3635 : : }
3636 : :
3637 : : // Feeler connections exist only to verify if address is online.
3638 [ + + ]: 8454 : if (pfrom.IsFeelerConn()) {
3639 [ + - - + : 337 : LogDebug(BCLog::NET, "feeler connection completed, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3640 : 337 : pfrom.fDisconnect = true;
3641 : : }
3642 : 8454 : return;
3643 : 15561 : }
3644 : :
3645 [ + + ]: 65776 : if (pfrom.nVersion == 0) {
3646 : : // Must have a version message before anything else
3647 [ + - - + : 2267 : LogDebug(BCLog::NET, "non-version message before version handshake. Message \"%s\" from peer=%d\n", SanitizeString(msg_type), pfrom.GetId());
- - - - -
- ]
3648 : 2267 : return;
3649 : : }
3650 : :
3651 [ + + ]: 63509 : if (msg_type == NetMsgType::VERACK) {
3652 [ + + ]: 8445 : if (pfrom.fSuccessfullyConnected) {
3653 [ + - - + : 1372 : LogDebug(BCLog::NET, "ignoring redundant verack message from peer=%d\n", pfrom.GetId());
- - ]
3654 : 1372 : return;
3655 : : }
3656 : :
3657 : : // Log successful connections unconditionally for outbound, but not for inbound as those
3658 : : // can be triggered by an attacker at high rate.
3659 [ + + + - : 7073 : if (!pfrom.IsInboundConn() || LogAcceptCategory(BCLog::NET, BCLog::Level::Debug)) {
- + ]
3660 [ + - ]: 3567 : const auto mapped_as{m_connman.GetMappedAS(pfrom.addr)};
3661 [ - + - - : 10701 : LogPrintf("New %s %s peer connected: version: %d, blocks=%d, peer=%d%s%s\n",
+ - + - +
- + - ]
3662 : : pfrom.ConnectionTypeAsString(),
3663 : : TransportTypeAsString(pfrom.m_transport->GetInfo().transport_type),
3664 : : pfrom.nVersion.load(), peer->m_starting_height,
3665 : : pfrom.GetId(), pfrom.LogIP(fLogIPs),
3666 : : (mapped_as ? strprintf(", mapped_as=%d", mapped_as) : ""));
3667 : : }
3668 : :
3669 [ + + ]: 7073 : if (pfrom.GetCommonVersion() >= SHORT_IDS_BLOCKS_VERSION) {
3670 : : // Tell our peer we are willing to provide version 2 cmpctblocks.
3671 : : // However, we do not request new block announcements using
3672 : : // cmpctblock messages.
3673 : : // We send this to non-NODE NETWORK peers as well, because
3674 : : // they may wish to request compact blocks from us
3675 [ + - + - ]: 12530 : MakeAndPushMessage(pfrom, NetMsgType::SENDCMPCT, /*high_bandwidth=*/false, /*version=*/CMPCTBLOCKS_VERSION);
3676 : : }
3677 : :
3678 [ + + ]: 7073 : if (m_txreconciliation) {
3679 [ + + + - : 5690 : if (!peer->m_wtxid_relay || !m_txreconciliation->IsPeerRegistered(pfrom.GetId())) {
+ + ]
3680 : : // We could have optimistically pre-registered/registered the peer. In that case,
3681 : : // we should forget about the reconciliation state here if this wasn't followed
3682 : : // by WTXIDRELAY (since WTXIDRELAY can't be announced later).
3683 [ + - ]: 5679 : m_txreconciliation->ForgetPeer(pfrom.GetId());
3684 : : }
3685 : : }
3686 : :
3687 [ + - + + ]: 7073 : if (auto tx_relay = peer->GetTxRelay()) {
3688 : : // `TxRelay::m_tx_inventory_to_send` must be empty before the
3689 : : // version handshake is completed as
3690 : : // `TxRelay::m_next_inv_send_time` is first initialised in
3691 : : // `SendMessages` after the verack is received. Any transactions
3692 : : // received during the version handshake would otherwise
3693 : : // immediately be advertised without random delay, potentially
3694 : : // leaking the time of arrival to a spy.
3695 [ + - + - : 11192 : Assume(WITH_LOCK(
+ - - + +
- ]
3696 : : tx_relay->m_tx_inventory_mutex,
3697 : : return tx_relay->m_tx_inventory_to_send.empty() &&
3698 : : tx_relay->m_next_inv_send_time == 0s));
3699 : : }
3700 : :
3701 : 7073 : {
3702 [ + - + - ]: 7073 : LOCK2(::cs_main, m_tx_download_mutex);
3703 : 7073 : const CNodeState* state = State(pfrom.GetId());
3704 : 7073 : m_txdownloadman.ConnectedPeer(pfrom.GetId(), node::TxDownloadConnectionInfo {
3705 [ + - ]: 7073 : .m_preferred = state->fPreferredDownload,
3706 [ + - ]: 7073 : .m_relay_permissions = pfrom.HasPermission(NetPermissionFlags::Relay),
3707 [ + - ]: 7073 : .m_wtxid_relay = peer->m_wtxid_relay,
3708 : : });
3709 [ + - ]: 7073 : }
3710 : :
3711 : 7073 : pfrom.fSuccessfullyConnected = true;
3712 : 7073 : return;
3713 : : }
3714 : :
3715 [ + + ]: 55064 : if (msg_type == NetMsgType::SENDHEADERS) {
3716 : 154 : peer->m_prefers_headers = true;
3717 : 154 : return;
3718 : : }
3719 : :
3720 [ + + ]: 54910 : if (msg_type == NetMsgType::SENDCMPCT) {
3721 : 643 : bool sendcmpct_hb{false};
3722 : 643 : uint64_t sendcmpct_version{0};
3723 [ + + + + ]: 643 : vRecv >> sendcmpct_hb >> sendcmpct_version;
3724 : :
3725 : : // Only support compact block relay with witnesses
3726 [ + + ]: 434 : if (sendcmpct_version != CMPCTBLOCKS_VERSION) return;
3727 : :
3728 [ + - ]: 249 : LOCK(cs_main);
3729 : 249 : CNodeState* nodestate = State(pfrom.GetId());
3730 : 249 : nodestate->m_provides_cmpctblocks = true;
3731 : 249 : nodestate->m_requested_hb_cmpctblocks = sendcmpct_hb;
3732 : : // save whether peer selects us as BIP152 high-bandwidth peer
3733 : : // (receiving sendcmpct(1) signals high-bandwidth, sendcmpct(0) low-bandwidth)
3734 [ + - ]: 249 : pfrom.m_bip152_highbandwidth_from = sendcmpct_hb;
3735 [ + - ]: 249 : return;
3736 : 249 : }
3737 : :
3738 : : // BIP339 defines feature negotiation of wtxidrelay, which must happen between
3739 : : // VERSION and VERACK to avoid relay problems from switching after a connection is up.
3740 [ + + ]: 54267 : if (msg_type == NetMsgType::WTXIDRELAY) {
3741 [ + + ]: 455 : if (pfrom.fSuccessfullyConnected) {
3742 : : // Disconnect peers that send a wtxidrelay message after VERACK.
3743 [ + - - + : 17 : LogDebug(BCLog::NET, "wtxidrelay received after verack, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3744 : 17 : pfrom.fDisconnect = true;
3745 : 17 : return;
3746 : : }
3747 [ + + ]: 438 : if (pfrom.GetCommonVersion() >= WTXID_RELAY_VERSION) {
3748 [ + + ]: 315 : if (!peer->m_wtxid_relay) {
3749 : 185 : peer->m_wtxid_relay = true;
3750 : 185 : m_wtxid_relay_peers++;
3751 : : } else {
3752 [ + - - + : 130 : LogDebug(BCLog::NET, "ignoring duplicate wtxidrelay from peer=%d\n", pfrom.GetId());
- - ]
3753 : : }
3754 : : } else {
3755 [ + - - + : 123 : LogDebug(BCLog::NET, "ignoring wtxidrelay due to old common version=%d from peer=%d\n", pfrom.GetCommonVersion(), pfrom.GetId());
- - ]
3756 : : }
3757 : 438 : return;
3758 : : }
3759 : :
3760 : : // BIP155 defines feature negotiation of addrv2 and sendaddrv2, which must happen
3761 : : // between VERSION and VERACK.
3762 [ + + ]: 53812 : if (msg_type == NetMsgType::SENDADDRV2) {
3763 [ + + ]: 215 : if (pfrom.fSuccessfullyConnected) {
3764 : : // Disconnect peers that send a SENDADDRV2 message after VERACK.
3765 [ + - - + : 8 : LogDebug(BCLog::NET, "sendaddrv2 received after verack, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3766 : 8 : pfrom.fDisconnect = true;
3767 : 8 : return;
3768 : : }
3769 : 207 : peer->m_wants_addrv2 = true;
3770 : 207 : return;
3771 : : }
3772 : :
3773 : : // Received from a peer demonstrating readiness to announce transactions via reconciliations.
3774 : : // This feature negotiation must happen between VERSION and VERACK to avoid relay problems
3775 : : // from switching announcement protocols after the connection is up.
3776 [ + + ]: 53597 : if (msg_type == NetMsgType::SENDTXRCNCL) {
3777 [ - + ]: 571 : if (!m_txreconciliation) {
3778 [ # # # # : 0 : LogDebug(BCLog::NET, "sendtxrcncl from peer=%d ignored, as our node does not have txreconciliation enabled\n", pfrom.GetId());
# # ]
3779 : 0 : return;
3780 : : }
3781 : :
3782 [ + + ]: 571 : if (pfrom.fSuccessfullyConnected) {
3783 [ + - - + : 10 : LogDebug(BCLog::NET, "sendtxrcncl received after verack, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3784 : 10 : pfrom.fDisconnect = true;
3785 : 10 : return;
3786 : : }
3787 : :
3788 : : // Peer must not offer us reconciliations if we specified no tx relay support in VERSION.
3789 [ + + ]: 561 : if (RejectIncomingTxs(pfrom)) {
3790 [ + - - + : 13 : LogDebug(BCLog::NET, "sendtxrcncl received to which we indicated no tx relay, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3791 : 13 : pfrom.fDisconnect = true;
3792 : 13 : return;
3793 : : }
3794 : :
3795 : : // Peer must not offer us reconciliations if they specified no tx relay support in VERSION.
3796 : : // This flag might also be false in other cases, but the RejectIncomingTxs check above
3797 : : // eliminates them, so that this flag fully represents what we are looking for.
3798 [ + - ]: 548 : const auto* tx_relay = peer->GetTxRelay();
3799 [ + + + - : 1083 : if (!tx_relay || !WITH_LOCK(tx_relay->m_bloom_filter_mutex, return tx_relay->m_relay_txs)) {
+ + + - ]
3800 [ + - - + : 26 : LogDebug(BCLog::NET, "sendtxrcncl received which indicated no tx relay to us, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3801 : 26 : pfrom.fDisconnect = true;
3802 : 26 : return;
3803 : : }
3804 : :
3805 : 522 : uint32_t peer_txreconcl_version;
3806 : 522 : uint64_t remote_salt;
3807 [ + + + + ]: 522 : vRecv >> peer_txreconcl_version >> remote_salt;
3808 : :
3809 [ + - ]: 322 : const ReconciliationRegisterResult result = m_txreconciliation->RegisterPeer(pfrom.GetId(), pfrom.IsInboundConn(),
3810 : : peer_txreconcl_version, remote_salt);
3811 [ + + + + ]: 322 : switch (result) {
3812 : 253 : case ReconciliationRegisterResult::NOT_FOUND:
3813 [ + - - + : 253 : LogDebug(BCLog::NET, "Ignore unexpected txreconciliation signal from peer=%d\n", pfrom.GetId());
- - ]
3814 : : break;
3815 : : case ReconciliationRegisterResult::SUCCESS:
3816 : : break;
3817 : 13 : case ReconciliationRegisterResult::ALREADY_REGISTERED:
3818 [ + - - + : 13 : LogDebug(BCLog::NET, "txreconciliation protocol violation (sendtxrcncl received from already registered peer), %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3819 : 13 : pfrom.fDisconnect = true;
3820 : 13 : return;
3821 : 10 : case ReconciliationRegisterResult::PROTOCOL_VIOLATION:
3822 [ + - - + : 10 : LogDebug(BCLog::NET, "txreconciliation protocol violation, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3823 : 10 : pfrom.fDisconnect = true;
3824 : 10 : return;
3825 : : }
3826 : 299 : return;
3827 : : }
3828 : :
3829 [ + + ]: 53026 : if (!pfrom.fSuccessfullyConnected) {
3830 [ + - - + : 1763 : LogDebug(BCLog::NET, "Unsupported message \"%s\" prior to verack from peer=%d\n", SanitizeString(msg_type), pfrom.GetId());
- - - - -
- ]
3831 : 1763 : return;
3832 : : }
3833 : :
3834 [ + + + + ]: 51263 : if (msg_type == NetMsgType::ADDR || msg_type == NetMsgType::ADDRV2) {
3835 : 5028 : const auto ser_params{
3836 [ + + ]: 5028 : msg_type == NetMsgType::ADDRV2 ?
3837 : : // Set V2 param so that the CNetAddr and CAddress
3838 : : // unserialize methods know that an address in v2 format is coming.
3839 : : CAddress::V2_NETWORK :
3840 : : CAddress::V1_NETWORK,
3841 : : };
3842 : :
3843 : 5028 : std::vector<CAddress> vAddr;
3844 : :
3845 [ + + ]: 5028 : vRecv >> ser_params(vAddr);
3846 : :
3847 [ + - + + ]: 2713 : if (!SetupAddressRelay(pfrom, *peer)) {
3848 [ + - - + : 43 : LogDebug(BCLog::NET, "ignoring %s message from %s peer=%d\n", msg_type, pfrom.ConnectionTypeAsString(), pfrom.GetId());
- - - - ]
3849 : 43 : return;
3850 : : }
3851 : :
3852 [ - + + + ]: 2670 : if (vAddr.size() > MAX_ADDR_TO_SEND)
3853 : : {
3854 [ + - + - ]: 12 : Misbehaving(*peer, strprintf("%s message size = %u", msg_type, vAddr.size()));
3855 : 12 : return;
3856 : : }
3857 : :
3858 : : // Store the new addresses
3859 : 2658 : std::vector<CAddress> vAddrOk;
3860 : 2658 : const auto current_a_time{Now<NodeSeconds>()};
3861 : :
3862 : : // Update/increment addr rate limiting bucket.
3863 : 2658 : const auto current_time{GetTime<std::chrono::microseconds>()};
3864 [ + + ]: 2658 : if (peer->m_addr_token_bucket < MAX_ADDR_PROCESSING_TOKEN_BUCKET) {
3865 : : // Don't increment bucket if it's already full
3866 [ + + ]: 2062 : const auto time_diff = std::max(current_time - peer->m_addr_token_timestamp, 0us);
3867 : 2062 : const double increment = Ticks<SecondsDouble>(time_diff) * MAX_ADDR_RATE_PER_SECOND;
3868 [ + + ]: 3538 : peer->m_addr_token_bucket = std::min<double>(peer->m_addr_token_bucket + increment, MAX_ADDR_PROCESSING_TOKEN_BUCKET);
3869 : : }
3870 : 2658 : peer->m_addr_token_timestamp = current_time;
3871 : :
3872 : 2658 : const bool rate_limited = !pfrom.HasPermission(NetPermissionFlags::Addr);
3873 : 2658 : uint64_t num_proc = 0;
3874 : 2658 : uint64_t num_rate_limit = 0;
3875 : 2658 : std::shuffle(vAddr.begin(), vAddr.end(), m_rng);
3876 [ + + ]: 258025 : for (CAddress& addr : vAddr)
3877 : : {
3878 [ + - ]: 255367 : if (interruptMsgProc)
3879 : : return;
3880 : :
3881 : : // Apply rate limiting.
3882 [ + + ]: 255367 : if (peer->m_addr_token_bucket < 1.0) {
3883 [ + + ]: 93054 : if (rate_limited) {
3884 : 19019 : ++num_rate_limit;
3885 : 19019 : continue;
3886 : : }
3887 : : } else {
3888 : 162313 : peer->m_addr_token_bucket -= 1.0;
3889 : : }
3890 : : // We only bother storing full nodes, though this may include
3891 : : // things which we would not make an outbound connection to, in
3892 : : // part because we may make feeler connections to them.
3893 [ + + - + ]: 271601 : if (!MayHaveUsefulAddressDB(addr.nServices) && !HasAllDesirableServiceFlags(addr.nServices))
3894 : 35253 : continue;
3895 : :
3896 [ + + + + ]: 201095 : if (addr.nTime <= NodeSeconds{100000000s} || addr.nTime > current_a_time + 10min) {
3897 : 127465 : addr.nTime = current_a_time - 5 * 24h;
3898 : : }
3899 [ + - ]: 201095 : AddAddressKnown(*peer, addr);
3900 [ - + - - : 201095 : if (m_banman && (m_banman->IsDiscouraged(addr) || m_banman->IsBanned(addr))) {
- - - - -
- ]
3901 : : // Do not process banned/discouraged addresses beyond remembering we received them
3902 : 0 : continue;
3903 : : }
3904 : 201095 : ++num_proc;
3905 [ + - ]: 201095 : const bool reachable{g_reachable_nets.Contains(addr)};
3906 [ + + + + : 202616 : if (addr.nTime > current_a_time - 10min && !peer->m_getaddr_sent && vAddr.size() <= 10 && addr.IsRoutable()) {
+ + + - +
+ ]
3907 : : // Relay to a limited number of other nodes
3908 [ + - ]: 372 : RelayAddress(pfrom.GetId(), addr, reachable);
3909 : : }
3910 : : // Do not store addresses outside our network
3911 [ + - ]: 201095 : if (reachable) {
3912 [ + - ]: 201095 : vAddrOk.push_back(addr);
3913 : : }
3914 : : }
3915 [ + - ]: 2658 : peer->m_addr_processed += num_proc;
3916 : 2658 : peer->m_addr_rate_limited += num_rate_limit;
3917 [ + - - + : 2658 : LogDebug(BCLog::NET, "Received addr: %u addresses (%u processed, %u rate-limited) from peer=%d\n",
- - - - ]
3918 : : vAddr.size(), num_proc, num_rate_limit, pfrom.GetId());
3919 : :
3920 [ + - ]: 2658 : m_addrman.Add(vAddrOk, pfrom.addr, 2h);
3921 [ - + + + ]: 2658 : if (vAddr.size() < 1000) peer->m_getaddr_sent = false;
3922 : :
3923 : : // AddrFetch: Require multiple addresses to avoid disconnecting on self-announcements
3924 [ + + + + ]: 2658 : if (pfrom.IsAddrFetchConn() && vAddr.size() > 1) {
3925 [ + - - + : 51 : LogDebug(BCLog::NET, "addrfetch connection completed, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
3926 : 51 : pfrom.fDisconnect = true;
3927 : : }
3928 : 2658 : return;
3929 : 5028 : }
3930 : :
3931 [ + + ]: 46235 : if (msg_type == NetMsgType::INV) {
3932 : 2865 : std::vector<CInv> vInv;
3933 [ + + ]: 2865 : vRecv >> vInv;
3934 [ - + - + ]: 2337 : if (vInv.size() > MAX_INV_SZ)
3935 : : {
3936 [ # # # # ]: 0 : Misbehaving(*peer, strprintf("inv message size = %u", vInv.size()));
3937 : 0 : return;
3938 : : }
3939 : :
3940 : 2337 : const bool reject_tx_invs{RejectIncomingTxs(pfrom)};
3941 : :
3942 [ + - + - ]: 2337 : LOCK2(cs_main, m_tx_download_mutex);
3943 : :
3944 : 2337 : const auto current_time{GetTime<std::chrono::microseconds>()};
3945 : 2337 : uint256* best_block{nullptr};
3946 : :
3947 [ + + ]: 902942 : for (CInv& inv : vInv) {
3948 [ + - ]: 900612 : if (interruptMsgProc) return;
3949 : :
3950 : : // Ignore INVs that don't match wtxidrelay setting.
3951 : : // Note that orphan parent fetching always uses MSG_TX GETDATAs regardless of the wtxidrelay setting.
3952 : : // This is fine as no INV messages are involved in that process.
3953 [ + + ]: 900612 : if (peer->m_wtxid_relay) {
3954 [ + + ]: 5143 : if (inv.IsMsgTx()) continue;
3955 : : } else {
3956 [ + + ]: 895469 : if (inv.IsMsgWtx()) continue;
3957 : : }
3958 : :
3959 [ + + ]: 875713 : if (inv.IsMsgBlk()) {
3960 [ + - ]: 2971 : const bool fAlreadyHave = AlreadyHaveBlock(inv.hash);
3961 [ + - - + : 2971 : LogDebug(BCLog::NET, "got inv: %s %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom.GetId());
- - - - -
- ]
3962 : :
3963 [ + - ]: 2971 : UpdateBlockAvailability(pfrom.GetId(), inv.hash);
3964 [ + + + - : 2971 : if (!fAlreadyHave && !m_chainman.m_blockman.LoadingBlocks() && !IsBlockRequested(inv.hash)) {
- + ]
3965 : : // Headers-first is the primary method of announcement on
3966 : : // the network. If a node fell back to sending blocks by
3967 : : // inv, it may be for a re-org, or because we haven't
3968 : : // completed initial headers sync. The final block hash
3969 : : // provided should be the highest, so send a getheaders and
3970 : : // then fetch the blocks we need to catch up.
3971 : : best_block = &inv.hash;
3972 : : }
3973 [ + + ]: 872742 : } else if (inv.IsGenTxMsg()) {
3974 [ + + ]: 172386 : if (reject_tx_invs) {
3975 [ + - - + : 7 : LogDebug(BCLog::NET, "transaction (%s) inv sent in violation of protocol, %s\n", inv.hash.ToString(), pfrom.DisconnectMsg(fLogIPs));
- - - - -
- ]
3976 : 7 : pfrom.fDisconnect = true;
3977 : 7 : return;
3978 : : }
3979 [ + - ]: 172379 : const GenTxid gtxid = ToGenTxid(inv);
3980 [ + - ]: 172379 : AddKnownTx(*peer, inv.hash);
3981 : :
3982 [ + - + + ]: 172379 : if (!m_chainman.IsInitialBlockDownload()) {
3983 [ + - ]: 171921 : const bool fAlreadyHave{m_txdownloadman.AddTxAnnouncement(pfrom.GetId(), gtxid, current_time)};
3984 [ + - - + : 171921 : LogDebug(BCLog::NET, "got inv: %s %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom.GetId());
- - - - -
- ]
3985 : : }
3986 : : } else {
3987 [ + - - + : 900605 : LogDebug(BCLog::NET, "Unknown inv type \"%s\" received from peer=%d\n", inv.ToString(), pfrom.GetId());
- - - - ]
3988 : : }
3989 : : }
3990 : :
3991 [ + + ]: 2330 : if (best_block != nullptr) {
3992 : : // If we haven't started initial headers-sync with this peer, then
3993 : : // consider sending a getheaders now. On initial startup, there's a
3994 : : // reliability vs bandwidth tradeoff, where we are only trying to do
3995 : : // initial headers sync with one peer at a time, with a long
3996 : : // timeout (at which point, if the sync hasn't completed, we will
3997 : : // disconnect the peer and then choose another). In the meantime,
3998 : : // as new blocks are found, we are willing to add one new peer per
3999 : : // block to sync with as well, to sync quicker in the case where
4000 : : // our initial peer is unresponsive (but less bandwidth than we'd
4001 : : // use if we turned on sync with all peers).
4002 [ + - ]: 557 : CNodeState& state{*Assert(State(pfrom.GetId()))};
4003 [ + + + + : 557 : if (state.fSyncStarted || (!peer->m_inv_triggered_getheaders_before_sync && *best_block != m_last_block_inv_triggering_headers_sync)) {
+ + ]
4004 [ + - + - : 378 : if (MaybeSendGetHeaders(pfrom, GetLocator(m_chainman.m_best_header), *peer)) {
+ + ]
4005 [ + - - + : 108 : LogDebug(BCLog::NET, "getheaders (%d) %s to peer=%d\n",
- - - - ]
4006 : : m_chainman.m_best_header->nHeight, best_block->ToString(),
4007 : : pfrom.GetId());
4008 : : }
4009 [ + + ]: 378 : if (!state.fSyncStarted) {
4010 : 82 : peer->m_inv_triggered_getheaders_before_sync = true;
4011 : : // Update the last block hash that triggered a new headers
4012 : : // sync, so that we don't turn on headers sync with more
4013 : : // than 1 new peer every new block.
4014 : 82 : m_last_block_inv_triggering_headers_sync = *best_block;
4015 : : }
4016 : : }
4017 : : }
4018 : :
4019 : 2330 : return;
4020 [ + - ]: 7539 : }
4021 : :
4022 [ + + ]: 43370 : if (msg_type == NetMsgType::GETDATA) {
4023 : 3073 : std::vector<CInv> vInv;
4024 [ + + ]: 3073 : vRecv >> vInv;
4025 [ - + - + ]: 2774 : if (vInv.size() > MAX_INV_SZ)
4026 : : {
4027 [ # # # # ]: 0 : Misbehaving(*peer, strprintf("getdata message size = %u", vInv.size()));
4028 : 0 : return;
4029 : : }
4030 : :
4031 [ + - - + : 2774 : LogDebug(BCLog::NET, "received getdata (%u invsz) peer=%d\n", vInv.size(), pfrom.GetId());
- - - - ]
4032 : :
4033 [ - + + + ]: 2774 : if (vInv.size() > 0) {
4034 [ + - - + : 2727 : LogDebug(BCLog::NET, "received getdata for: %s peer=%d\n", vInv[0].ToString(), pfrom.GetId());
- - - - ]
4035 : : }
4036 : :
4037 : 2774 : {
4038 [ + - ]: 2774 : LOCK(peer->m_getdata_requests_mutex);
4039 [ + - ]: 2774 : peer->m_getdata_requests.insert(peer->m_getdata_requests.end(), vInv.begin(), vInv.end());
4040 [ + - ]: 2774 : ProcessGetData(pfrom, *peer, interruptMsgProc);
4041 : 0 : }
4042 : :
4043 : 2774 : return;
4044 : 3073 : }
4045 : :
4046 [ + + ]: 40297 : if (msg_type == NetMsgType::GETBLOCKS) {
4047 : 288 : CBlockLocator locator;
4048 : 288 : uint256 hashStop;
4049 [ + + + + ]: 288 : vRecv >> locator >> hashStop;
4050 : :
4051 [ - + + + ]: 189 : if (locator.vHave.size() > MAX_LOCATOR_SZ) {
4052 [ + - - + : 7 : LogDebug(BCLog::NET, "getblocks locator size %lld > %d, %s\n", locator.vHave.size(), MAX_LOCATOR_SZ, pfrom.DisconnectMsg(fLogIPs));
- - - - ]
4053 : 7 : pfrom.fDisconnect = true;
4054 : 7 : return;
4055 : : }
4056 : :
4057 : : // We might have announced the currently-being-connected tip using a
4058 : : // compact block, which resulted in the peer sending a getblocks
4059 : : // request, which we would otherwise respond to without the new block.
4060 : : // To avoid this situation we simply verify that we are on our best
4061 : : // known chain now. This is super overkill, but we handle it better
4062 : : // for getheaders requests, and there are no known nodes which support
4063 : : // compact blocks but still use getblocks to request blocks.
4064 : 182 : {
4065 : 182 : std::shared_ptr<const CBlock> a_recent_block;
4066 : 182 : {
4067 [ + - ]: 182 : LOCK(m_most_recent_block_mutex);
4068 [ + - ]: 182 : a_recent_block = m_most_recent_block;
4069 : 182 : }
4070 [ + - ]: 182 : BlockValidationState state;
4071 [ + - - + : 182 : if (!m_chainman.ActiveChainstate().ActivateBestChain(state, a_recent_block)) {
+ - - + -
+ ]
4072 [ # # # # : 0 : LogDebug(BCLog::NET, "failed to activate chain (%s)\n", state.ToString());
# # # # ]
4073 : : }
4074 [ - + ]: 182 : }
4075 : :
4076 [ + - ]: 182 : LOCK(cs_main);
4077 : :
4078 : : // Find the last block the caller has in the main chain
4079 [ + - + - ]: 182 : const CBlockIndex* pindex = m_chainman.ActiveChainstate().FindForkInGlobalIndex(locator);
4080 : :
4081 : : // Send the rest of the chain
4082 [ + - ]: 182 : if (pindex)
4083 [ + - ]: 182 : pindex = m_chainman.ActiveChain().Next(pindex);
4084 : 182 : int nLimit = 500;
4085 [ + - - + : 182 : 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());
- - - - -
- - - -
- ]
4086 [ + - + + ]: 26323 : for (; pindex; pindex = m_chainman.ActiveChain().Next(pindex))
4087 : : {
4088 [ + + ]: 26198 : if (pindex->GetBlockHash() == hashStop)
4089 : : {
4090 [ + - - + : 57 : LogDebug(BCLog::NET, " getblocks stopping at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString());
- - - - ]
4091 : : break;
4092 : : }
4093 : : // If pruning, don't inv blocks unless we have on disk and are likely to still have
4094 : : // for some reasonable time window (1 hour) that block relay might require.
4095 : 26141 : const int nPrunedBlocksLikelyToHave = MIN_BLOCKS_TO_KEEP - 3600 / m_chainparams.GetConsensus().nPowTargetSpacing;
4096 [ - + - - : 26141 : if (m_chainman.m_blockman.IsPruneMode() && (!(pindex->nStatus & BLOCK_HAVE_DATA) || pindex->nHeight <= m_chainman.ActiveChain().Tip()->nHeight - nPrunedBlocksLikelyToHave)) {
- - - - -
- ]
4097 [ # # # # : 0 : LogDebug(BCLog::NET, " getblocks stopping, pruned or too old block at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString());
# # # # ]
4098 : : break;
4099 : : }
4100 [ + - + - : 78423 : WITH_LOCK(peer->m_block_inv_mutex, peer->m_blocks_for_inv_relay.push_back(pindex->GetBlockHash()));
+ - ]
4101 [ - + ]: 26141 : if (--nLimit <= 0) {
4102 : : // When this block is requested, we'll send an inv that'll
4103 : : // trigger the peer to getblocks the next batch of inventory.
4104 [ # # # # : 0 : LogDebug(BCLog::NET, " getblocks stopping at limit %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString());
# # # # ]
4105 [ # # # # ]: 0 : WITH_LOCK(peer->m_block_inv_mutex, {peer->m_continuation_block = pindex->GetBlockHash();});
4106 : : break;
4107 : : }
4108 : : }
4109 [ + - ]: 182 : return;
4110 : 470 : }
4111 : :
4112 [ + + ]: 40009 : if (msg_type == NetMsgType::GETBLOCKTXN) {
4113 : 542 : BlockTransactionsRequest req;
4114 [ + + ]: 542 : vRecv >> req;
4115 : :
4116 : 307 : std::shared_ptr<const CBlock> recent_block;
4117 : 307 : {
4118 [ + - ]: 307 : LOCK(m_most_recent_block_mutex);
4119 [ + + ]: 307 : if (m_most_recent_block_hash == req.blockhash)
4120 : 35 : recent_block = m_most_recent_block;
4121 : : // Unlock m_most_recent_block_mutex to avoid cs_main lock inversion
4122 : 307 : }
4123 [ - + ]: 307 : if (recent_block) {
4124 [ # # ]: 0 : SendBlockTransactions(pfrom, *peer, *recent_block, req);
4125 : : return;
4126 : : }
4127 : :
4128 : 307 : FlatFilePos block_pos{};
4129 : 307 : {
4130 [ + - ]: 307 : LOCK(cs_main);
4131 : :
4132 [ + - ]: 307 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(req.blockhash);
4133 [ + + - + ]: 307 : if (!pindex || !(pindex->nStatus & BLOCK_HAVE_DATA)) {
4134 [ + - - + : 108 : LogDebug(BCLog::NET, "Peer %d sent us a getblocktxn for a block we don't have\n", pfrom.GetId());
- - ]
4135 [ + - ]: 108 : return;
4136 : : }
4137 : :
4138 [ + - - + : 199 : if (pindex->nHeight >= m_chainman.ActiveChain().Height() - MAX_BLOCKTXN_DEPTH) {
+ + ]
4139 : 120 : block_pos = pindex->GetBlockPos();
4140 : : }
4141 : 108 : }
4142 : :
4143 [ + + ]: 199 : if (!block_pos.IsNull()) {
4144 : 120 : CBlock block;
4145 [ + - ]: 120 : const bool ret{m_chainman.m_blockman.ReadBlock(block, block_pos, req.blockhash)};
4146 : : // If height is above MAX_BLOCKTXN_DEPTH then this block cannot get
4147 : : // pruned after we release cs_main above, so this read should never fail.
4148 [ - + ]: 120 : assert(ret);
4149 : :
4150 [ + - ]: 120 : SendBlockTransactions(pfrom, *peer, block, req);
4151 : 120 : return;
4152 : 120 : }
4153 : :
4154 : : // If an older block is requested (should never happen in practice,
4155 : : // but can happen in tests) send a block response instead of a
4156 : : // blocktxn response. Sending a full block response instead of a
4157 : : // small blocktxn response is preferable in the case where a peer
4158 : : // might maliciously send lots of getblocktxn requests to trigger
4159 : : // expensive disk reads, because it will require the peer to
4160 : : // actually receive all the data read from disk over the network.
4161 [ + - - + : 79 : LogDebug(BCLog::NET, "Peer %d sent us a getblocktxn for a block > %i deep\n", pfrom.GetId(), MAX_BLOCKTXN_DEPTH);
- - ]
4162 [ + - ]: 79 : CInv inv{MSG_WITNESS_BLOCK, req.blockhash};
4163 [ + - + - ]: 237 : WITH_LOCK(peer->m_getdata_requests_mutex, peer->m_getdata_requests.push_back(inv));
4164 : : // The message processing loop will go around again (without pausing) and we'll respond then
4165 : : return;
4166 : 542 : }
4167 : :
4168 [ + + ]: 39467 : if (msg_type == NetMsgType::GETHEADERS) {
4169 : 637 : CBlockLocator locator;
4170 : 637 : uint256 hashStop;
4171 [ + + + + ]: 637 : vRecv >> locator >> hashStop;
4172 : :
4173 [ - + + + ]: 505 : if (locator.vHave.size() > MAX_LOCATOR_SZ) {
4174 [ + - - + : 7 : LogDebug(BCLog::NET, "getheaders locator size %lld > %d, %s\n", locator.vHave.size(), MAX_LOCATOR_SZ, pfrom.DisconnectMsg(fLogIPs));
- - - - ]
4175 : 7 : pfrom.fDisconnect = true;
4176 : 7 : return;
4177 : : }
4178 : :
4179 [ - + ]: 498 : if (m_chainman.m_blockman.LoadingBlocks()) {
4180 [ # # # # : 0 : LogDebug(BCLog::NET, "Ignoring getheaders from peer=%d while importing/reindexing\n", pfrom.GetId());
# # ]
4181 : 0 : return;
4182 : : }
4183 : :
4184 [ + - ]: 498 : LOCK(cs_main);
4185 : :
4186 : : // Don't serve headers from our active chain until our chainwork is at least
4187 : : // the minimum chain work. This prevents us from starting a low-work headers
4188 : : // sync that will inevitably be aborted by our peer.
4189 [ + - + - : 996 : if (m_chainman.ActiveTip() == nullptr ||
- + ]
4190 [ + - + - : 498 : (m_chainman.ActiveTip()->nChainWork < m_chainman.MinimumChainWork() && !pfrom.HasPermission(NetPermissionFlags::Download))) {
+ - - - ]
4191 [ # # # # : 0 : LogDebug(BCLog::NET, "Ignoring getheaders from peer=%d because active chain has too little work; sending empty response\n", pfrom.GetId());
# # ]
4192 : : // Just respond with an empty headers message, to tell the peer to
4193 : : // go away but not treat us as unresponsive.
4194 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::HEADERS, std::vector<CBlockHeader>());
4195 : 0 : return;
4196 : : }
4197 : :
4198 : 498 : CNodeState *nodestate = State(pfrom.GetId());
4199 : 498 : const CBlockIndex* pindex = nullptr;
4200 [ + + ]: 498 : if (locator.IsNull())
4201 : : {
4202 : : // If locator is null, return the hashStop block
4203 [ + - ]: 100 : pindex = m_chainman.m_blockman.LookupBlockIndex(hashStop);
4204 [ + + ]: 100 : if (!pindex) {
4205 : : return;
4206 : : }
4207 : :
4208 [ + - - + ]: 42 : if (!BlockRequestAllowed(pindex)) {
4209 [ # # # # : 0 : LogDebug(BCLog::NET, "%s: ignoring request from peer=%i for old block header that isn't in the main chain\n", __func__, pfrom.GetId());
# # ]
4210 : 0 : return;
4211 : : }
4212 : : }
4213 : : else
4214 : : {
4215 : : // Find the last block the caller has in the main chain
4216 [ + - + - ]: 398 : pindex = m_chainman.ActiveChainstate().FindForkInGlobalIndex(locator);
4217 [ + - ]: 398 : if (pindex)
4218 [ + - ]: 398 : pindex = m_chainman.ActiveChain().Next(pindex);
4219 : : }
4220 : :
4221 : : // we must use CBlocks, as CBlockHeaders won't include the 0x00 nTx count at the end
4222 : 440 : std::vector<CBlock> vHeaders;
4223 : 440 : int nLimit = m_opts.max_headers_result;
4224 [ + - - + : 440 : LogDebug(BCLog::NET, "getheaders %d to %s from peer=%d\n", (pindex ? pindex->nHeight : -1), hashStop.IsNull() ? "end" : hashStop.ToString(), pfrom.GetId());
- - - - -
- - - -
- ]
4225 [ + - + + ]: 75028 : for (; pindex; pindex = m_chainman.ActiveChain().Next(pindex))
4226 : : {
4227 [ + - ]: 74660 : vHeaders.emplace_back(pindex->GetBlockHeader());
4228 [ + - + + ]: 74660 : if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
4229 : : break;
4230 : : }
4231 : : // pindex can be nullptr either if we sent m_chainman.ActiveChain().Tip() OR
4232 : : // if our peer has m_chainman.ActiveChain().Tip() (and thus we are sending an empty
4233 : : // headers message). In both cases it's safe to update
4234 : : // pindexBestHeaderSent to be our tip.
4235 : : //
4236 : : // It is important that we simply reset the BestHeaderSent value here,
4237 : : // and not max(BestHeaderSent, newHeaderSent). We might have announced
4238 : : // the currently-being-connected tip using a compact block, which
4239 : : // resulted in the peer sending a headers request, which we respond to
4240 : : // without the new block. By resetting the BestHeaderSent, we ensure we
4241 : : // will re-announce the new block via headers (or compact blocks again)
4242 : : // in the SendMessages logic.
4243 [ + + + - : 440 : nodestate->pindexBestHeaderSent = pindex ? pindex : m_chainman.ActiveChain().Tip();
- + ]
4244 [ + - + - ]: 440 : MakeAndPushMessage(pfrom, NetMsgType::HEADERS, TX_WITH_WITNESS(vHeaders));
4245 : 440 : return;
4246 : 1575 : }
4247 : :
4248 [ + + ]: 38830 : if (msg_type == NetMsgType::TX) {
4249 [ + + ]: 6893 : if (RejectIncomingTxs(pfrom)) {
4250 [ + - - + : 8 : LogDebug(BCLog::NET, "transaction sent in violation of protocol, %s", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
4251 : 8 : pfrom.fDisconnect = true;
4252 : 8 : return;
4253 : : }
4254 : :
4255 : : // Stop processing the transaction early if we are still in IBD since we don't
4256 : : // have enough information to validate it yet. Sending unsolicited transactions
4257 : : // is not considered a protocol violation, so don't punish the peer.
4258 [ + - + + ]: 6885 : if (m_chainman.IsInitialBlockDownload()) return;
4259 : :
4260 : 6590 : CTransactionRef ptx;
4261 [ + + ]: 6590 : vRecv >> TX_WITH_WITNESS(ptx);
4262 : :
4263 [ + + ]: 4759 : const Txid& txid = ptx->GetHash();
4264 [ + + ]: 4759 : const Wtxid& wtxid = ptx->GetWitnessHash();
4265 : :
4266 [ + + ]: 4759 : const uint256& hash = peer->m_wtxid_relay ? wtxid.ToUint256() : txid.ToUint256();
4267 [ + - ]: 4759 : AddKnownTx(*peer, hash);
4268 : :
4269 [ + - + - ]: 4759 : LOCK2(cs_main, m_tx_download_mutex);
4270 : :
4271 [ + - + + ]: 4759 : const auto& [should_validate, package_to_validate] = m_txdownloadman.ReceivedTx(pfrom.GetId(), ptx);
4272 [ + + ]: 4759 : if (!should_validate) {
4273 [ + + ]: 360 : if (pfrom.HasPermission(NetPermissionFlags::ForceRelay)) {
4274 : : // Always relay transactions received from peers with forcerelay
4275 : : // permission, even if they were already in the mempool, allowing
4276 : : // the node to function as a gateway for nodes hidden behind it.
4277 [ + - + - ]: 87 : if (!m_mempool.exists(txid)) {
4278 [ + - + - : 174 : LogPrintf("Not relaying non-mempool transaction %s (wtxid=%s) from forcerelay peer=%d\n",
+ - ]
4279 : : txid.ToString(), wtxid.ToString(), pfrom.GetId());
4280 : : } else {
4281 [ # # # # : 0 : LogPrintf("Force relaying tx %s (wtxid=%s) from peer=%d\n",
# # ]
4282 : : txid.ToString(), wtxid.ToString(), pfrom.GetId());
4283 [ # # ]: 0 : RelayTransaction(txid, wtxid);
4284 : : }
4285 : : }
4286 : :
4287 [ - + ]: 360 : if (package_to_validate) {
4288 [ # # # # ]: 0 : const auto package_result{ProcessNewPackage(m_chainman.ActiveChainstate(), m_mempool, package_to_validate->m_txns, /*test_accept=*/false, /*client_maxfeerate=*/std::nullopt)};
4289 [ # # # # : 0 : LogDebug(BCLog::TXPACKAGES, "package evaluation for %s: %s\n", package_to_validate->ToString(),
# # # # #
# ]
4290 : : package_result.m_state.IsValid() ? "package accepted" : "package rejected");
4291 [ # # # # ]: 0 : ProcessPackageResult(package_to_validate.value(), package_result);
4292 : 0 : }
4293 : 360 : return;
4294 : : }
4295 : :
4296 : : // ReceivedTx should not be telling us to validate the tx and a package.
4297 [ + - ]: 4399 : Assume(!package_to_validate.has_value());
4298 : :
4299 [ + - ]: 4399 : const MempoolAcceptResult result = m_chainman.ProcessTransaction(ptx);
4300 : 4399 : const TxValidationState& state = result.m_state;
4301 : :
4302 [ - + ]: 4399 : if (result.m_result_type == MempoolAcceptResult::ResultType::VALID) {
4303 [ # # ]: 0 : ProcessValidTx(pfrom.GetId(), ptx, result.m_replaced_transactions);
4304 : 0 : pfrom.m_last_tx_time = GetTime<std::chrono::seconds>();
4305 : : }
4306 [ + - ]: 4399 : if (state.IsInvalid()) {
4307 [ + - - + ]: 4399 : if (auto package_to_validate{ProcessInvalidTx(pfrom.GetId(), ptx, state, /*first_time_failure=*/true)}) {
4308 [ # # # # ]: 0 : const auto package_result{ProcessNewPackage(m_chainman.ActiveChainstate(), m_mempool, package_to_validate->m_txns, /*test_accept=*/false, /*client_maxfeerate=*/std::nullopt)};
4309 [ # # # # : 0 : LogDebug(BCLog::TXPACKAGES, "package evaluation for %s: %s\n", package_to_validate->ToString(),
# # # # #
# ]
4310 : : package_result.m_state.IsValid() ? "package accepted" : "package rejected");
4311 [ # # # # ]: 0 : ProcessPackageResult(package_to_validate.value(), package_result);
4312 : 4399 : }
4313 : : }
4314 : :
4315 : 4399 : return;
4316 [ + - + - : 25266 : }
+ - ]
4317 : :
4318 [ + + ]: 31937 : if (msg_type == NetMsgType::CMPCTBLOCK)
4319 : : {
4320 : : // Ignore cmpctblock received while importing
4321 [ - + ]: 4269 : if (m_chainman.m_blockman.LoadingBlocks()) {
4322 [ # # # # : 0 : LogDebug(BCLog::NET, "Unexpected cmpctblock message received from peer %d\n", pfrom.GetId());
# # ]
4323 : 0 : return;
4324 : : }
4325 : :
4326 : 4269 : CBlockHeaderAndShortTxIDs cmpctblock;
4327 [ + + ]: 4269 : vRecv >> cmpctblock;
4328 : :
4329 : 3886 : bool received_new_header = false;
4330 [ + - ]: 3886 : const auto blockhash = cmpctblock.header.GetHash();
4331 : :
4332 : 3886 : {
4333 [ + - ]: 3886 : LOCK(cs_main);
4334 : :
4335 [ + - ]: 3886 : const CBlockIndex* prev_block = m_chainman.m_blockman.LookupBlockIndex(cmpctblock.header.hashPrevBlock);
4336 [ + + ]: 3886 : if (!prev_block) {
4337 : : // Doesn't connect (or is genesis), instead of DoSing in AcceptBlockHeader, request deeper headers
4338 [ + - + + ]: 1726 : if (!m_chainman.IsInitialBlockDownload()) {
4339 [ + - + - ]: 282 : MaybeSendGetHeaders(pfrom, GetLocator(m_chainman.m_best_header), *peer);
4340 : : }
4341 : 1726 : return;
4342 [ + - + - : 2160 : } else if (prev_block->nChainWork + CalculateClaimedHeadersWork({{cmpctblock.header}}) < GetAntiDoSWorkThreshold()) {
+ - + + ]
4343 : : // If we get a low-work header in a compact block, we can ignore it.
4344 [ + - - + : 1848 : LogDebug(BCLog::NET, "Ignoring low-work compact block from peer %d\n", pfrom.GetId());
- - ]
4345 : 1848 : return;
4346 : : }
4347 : :
4348 [ + - + + ]: 312 : if (!m_chainman.m_blockman.LookupBlockIndex(blockhash)) {
4349 : 302 : received_new_header = true;
4350 : : }
4351 : 3574 : }
4352 : :
4353 : 312 : const CBlockIndex *pindex = nullptr;
4354 [ + - ]: 312 : BlockValidationState state;
4355 [ + - + + ]: 312 : if (!m_chainman.ProcessNewBlockHeaders({{cmpctblock.header}}, /*min_pow_checked=*/true, state, &pindex)) {
4356 [ + - ]: 283 : if (state.IsInvalid()) {
4357 [ + - + - ]: 283 : MaybePunishNodeForBlock(pfrom.GetId(), state, /*via_compact_block=*/true, "invalid header via cmpctblock");
4358 : 283 : return;
4359 : : }
4360 : : }
4361 : :
4362 : : // If AcceptBlockHeader returned true, it set pindex
4363 [ + - ]: 29 : Assert(pindex);
4364 [ + + ]: 29 : if (received_new_header) {
4365 [ + - ]: 19 : LogBlockHeader(*pindex, pfrom, /*via_compact_block=*/true);
4366 : : }
4367 : :
4368 : 29 : bool fProcessBLOCKTXN = false;
4369 : :
4370 : : // If we end up treating this as a plain headers message, call that as well
4371 : : // without cs_main.
4372 : 29 : bool fRevertToHeaderProcessing = false;
4373 : :
4374 : : // Keep a CBlock for "optimistic" compactblock reconstructions (see
4375 : : // below)
4376 [ + - ]: 29 : std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
4377 : 29 : bool fBlockReconstructed = false;
4378 : :
4379 : 29 : {
4380 [ + - ]: 29 : LOCK(cs_main);
4381 [ + - ]: 29 : UpdateBlockAvailability(pfrom.GetId(), pindex->GetBlockHash());
4382 : :
4383 : 29 : CNodeState *nodestate = State(pfrom.GetId());
4384 : :
4385 : : // If this was a new header with more work than our tip, update the
4386 : : // peer's last block announcement time
4387 [ + + + - : 48 : if (received_new_header && pindex->nChainWork > m_chainman.ActiveChain().Tip()->nChainWork) {
- + + - -
+ ]
4388 [ # # ]: 0 : nodestate->m_last_block_announcement = GetTime();
4389 : : }
4390 : :
4391 [ + - ]: 29 : if (pindex->nStatus & BLOCK_HAVE_DATA) // Nothing to do here
4392 : : return;
4393 : :
4394 : 29 : auto range_flight = mapBlocksInFlight.equal_range(pindex->GetBlockHash());
4395 : 29 : size_t already_in_flight = std::distance(range_flight.first, range_flight.second);
4396 : 29 : bool requested_block_from_this_peer{false};
4397 : :
4398 : : // Multimap ensures ordering of outstanding requests. It's either empty or first in line.
4399 [ - + - - ]: 29 : bool first_in_flight = already_in_flight == 0 || (range_flight.first->second.first == pfrom.GetId());
4400 : :
4401 [ - + ]: 29 : while (range_flight.first != range_flight.second) {
4402 [ # # ]: 0 : if (range_flight.first->second.first == pfrom.GetId()) {
4403 : : requested_block_from_this_peer = true;
4404 : : break;
4405 : : }
4406 : 0 : range_flight.first++;
4407 : : }
4408 : :
4409 [ + - - + : 58 : if (pindex->nChainWork <= m_chainman.ActiveChain().Tip()->nChainWork || // We know something better
+ - - + ]
4410 [ # # ]: 0 : pindex->nTx != 0) { // We had this block at some point, but pruned it
4411 [ - + ]: 29 : if (requested_block_from_this_peer) {
4412 : : // We requested this block for some reason, but our mempool will probably be useless
4413 : : // so we just grab the block via normal getdata
4414 [ # # ]: 0 : std::vector<CInv> vInv(1);
4415 [ # # ]: 0 : vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(*peer), blockhash);
4416 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, vInv);
4417 : 0 : }
4418 : 29 : return;
4419 : : }
4420 : :
4421 : : // If we're not close to tip yet, give up and let parallel block fetch work its magic
4422 [ # # # # : 0 : if (!already_in_flight && !CanDirectFetch()) {
# # ]
4423 : : return;
4424 : : }
4425 : :
4426 : : // We want to be a bit conservative just to be extra careful about DoS
4427 : : // possibilities in compact block processing...
4428 [ # # # # : 0 : if (pindex->nHeight <= m_chainman.ActiveChain().Height() + 2) {
# # ]
4429 [ # # # # : 0 : if ((already_in_flight < MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK && nodestate->vBlocksInFlight.size() < MAX_BLOCKS_IN_TRANSIT_PER_PEER) ||
# # ]
4430 : : requested_block_from_this_peer) {
4431 : 0 : std::list<QueuedBlock>::iterator* queuedBlockIt = nullptr;
4432 [ # # # # ]: 0 : if (!BlockRequested(pfrom.GetId(), *pindex, &queuedBlockIt)) {
4433 [ # # ]: 0 : if (!(*queuedBlockIt)->partialBlock)
4434 [ # # # # ]: 0 : (*queuedBlockIt)->partialBlock.reset(new PartiallyDownloadedBlock(&m_mempool));
4435 : : else {
4436 : : // The block was already in flight using compact blocks from the same peer
4437 [ # # # # : 0 : LogDebug(BCLog::NET, "Peer sent us compact block we were already syncing!\n");
# # ]
4438 : 0 : return;
4439 : : }
4440 : : }
4441 : :
4442 [ # # ]: 0 : PartiallyDownloadedBlock& partialBlock = *(*queuedBlockIt)->partialBlock;
4443 [ # # ]: 0 : ReadStatus status = partialBlock.InitData(cmpctblock, vExtraTxnForCompact);
4444 [ # # ]: 0 : if (status == READ_STATUS_INVALID) {
4445 [ # # ]: 0 : RemoveBlockRequest(pindex->GetBlockHash(), pfrom.GetId()); // Reset in-flight state in case Misbehaving does not result in a disconnect
4446 [ # # # # ]: 0 : Misbehaving(*peer, "invalid compact block");
4447 : 0 : return;
4448 [ # # ]: 0 : } else if (status == READ_STATUS_FAILED) {
4449 [ # # ]: 0 : if (first_in_flight) {
4450 : : // Duplicate txindexes, the block is now in-flight, so just request it
4451 [ # # ]: 0 : std::vector<CInv> vInv(1);
4452 [ # # ]: 0 : vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(*peer), blockhash);
4453 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, vInv);
4454 : 0 : } else {
4455 : : // Give up for this peer and wait for other peer(s)
4456 [ # # ]: 0 : RemoveBlockRequest(pindex->GetBlockHash(), pfrom.GetId());
4457 : : }
4458 : 0 : return;
4459 : : }
4460 : :
4461 : 0 : BlockTransactionsRequest req;
4462 [ # # # # ]: 0 : for (size_t i = 0; i < cmpctblock.BlockTxCount(); i++) {
4463 [ # # # # ]: 0 : if (!partialBlock.IsTxAvailable(i))
4464 [ # # ]: 0 : req.indexes.push_back(i);
4465 : : }
4466 [ # # ]: 0 : if (req.indexes.empty()) {
4467 : : fProcessBLOCKTXN = true;
4468 [ # # ]: 0 : } else if (first_in_flight) {
4469 : : // We will try to round-trip any compact blocks we get on failure,
4470 : : // as long as it's first...
4471 : 0 : req.blockhash = pindex->GetBlockHash();
4472 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::GETBLOCKTXN, req);
4473 [ # # ]: 0 : } else if (pfrom.m_bip152_highbandwidth_to &&
4474 [ # # # # ]: 0 : (!pfrom.IsInboundConn() ||
4475 [ # # # # ]: 0 : IsBlockRequestedFromOutbound(blockhash) ||
4476 : : already_in_flight < MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK - 1)) {
4477 : : // ... or it's a hb relay peer and:
4478 : : // - peer is outbound, or
4479 : : // - we already have an outbound attempt in flight(so we'll take what we can get), or
4480 : : // - it's not the final parallel download slot (which we may reserve for first outbound)
4481 : 0 : req.blockhash = pindex->GetBlockHash();
4482 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::GETBLOCKTXN, req);
4483 : : } else {
4484 : : // Give up for this peer and wait for other peer(s)
4485 [ # # ]: 0 : RemoveBlockRequest(pindex->GetBlockHash(), pfrom.GetId());
4486 : : }
4487 : 0 : } else {
4488 : : // This block is either already in flight from a different
4489 : : // peer, or this peer has too many blocks outstanding to
4490 : : // download from.
4491 : : // Optimistically try to reconstruct anyway since we might be
4492 : : // able to without any round trips.
4493 : 0 : PartiallyDownloadedBlock tempBlock(&m_mempool);
4494 [ # # ]: 0 : ReadStatus status = tempBlock.InitData(cmpctblock, vExtraTxnForCompact);
4495 [ # # ]: 0 : if (status != READ_STATUS_OK) {
4496 : : // TODO: don't ignore failures
4497 : 0 : return;
4498 : : }
4499 : 0 : std::vector<CTransactionRef> dummy;
4500 [ # # # # ]: 0 : const CBlockIndex* prev_block{Assume(m_chainman.m_blockman.LookupBlockIndex(cmpctblock.header.hashPrevBlock))};
4501 [ # # ]: 0 : status = tempBlock.FillBlock(*pblock, dummy,
4502 : 0 : /*segwit_active=*/DeploymentActiveAfter(prev_block, m_chainman, Consensus::DEPLOYMENT_SEGWIT));
4503 [ # # ]: 0 : if (status == READ_STATUS_OK) {
4504 : 0 : fBlockReconstructed = true;
4505 : : }
4506 : 0 : }
4507 : : } else {
4508 [ # # ]: 0 : if (requested_block_from_this_peer) {
4509 : : // We requested this block, but its far into the future, so our
4510 : : // mempool will probably be useless - request the block normally
4511 [ # # ]: 0 : std::vector<CInv> vInv(1);
4512 [ # # ]: 0 : vInv[0] = CInv(MSG_BLOCK | GetFetchFlags(*peer), blockhash);
4513 [ # # # # ]: 0 : MakeAndPushMessage(pfrom, NetMsgType::GETDATA, vInv);
4514 : 0 : return;
4515 : 0 : } else {
4516 : : // If this was an announce-cmpctblock, we want the same treatment as a header message
4517 : : fRevertToHeaderProcessing = true;
4518 : : }
4519 : : }
4520 : 29 : } // cs_main
4521 : :
4522 [ # # ]: 0 : if (fProcessBLOCKTXN) {
4523 : 0 : BlockTransactions txn;
4524 : 0 : txn.blockhash = blockhash;
4525 [ # # ]: 0 : return ProcessCompactBlockTxns(pfrom, *peer, txn);
4526 : 0 : }
4527 : :
4528 [ # # ]: 0 : if (fRevertToHeaderProcessing) {
4529 : : // Headers received from HB compact block peers are permitted to be
4530 : : // relayed before full validation (see BIP 152), so we don't want to disconnect
4531 : : // the peer if the header turns out to be for an invalid block.
4532 : : // Note that if a peer tries to build on an invalid chain, that
4533 : : // will be detected and the peer will be disconnected/discouraged.
4534 [ # # # # ]: 0 : return ProcessHeadersMessage(pfrom, *peer, {cmpctblock.header}, /*via_compact_block=*/true);
4535 : : }
4536 : :
4537 [ # # ]: 0 : if (fBlockReconstructed) {
4538 : : // If we got here, we were able to optimistically reconstruct a
4539 : : // block that is in flight from some other peer.
4540 : 0 : {
4541 [ # # ]: 0 : LOCK(cs_main);
4542 [ # # # # ]: 0 : mapBlockSource.emplace(pblock->GetHash(), std::make_pair(pfrom.GetId(), false));
4543 : 0 : }
4544 : : // Setting force_processing to true means that we bypass some of
4545 : : // our anti-DoS protections in AcceptBlock, which filters
4546 : : // unrequested blocks that might be trying to waste our resources
4547 : : // (eg disk space). Because we only try to reconstruct blocks when
4548 : : // we're close to caught up (via the CanDirectFetch() requirement
4549 : : // above, combined with the behavior of not requesting blocks until
4550 : : // we have a chain with at least the minimum chain work), and we ignore
4551 : : // compact blocks with less work than our tip, it is safe to treat
4552 : : // reconstructed compact blocks as having been requested.
4553 [ # # # # ]: 0 : ProcessBlock(pfrom, pblock, /*force_processing=*/true, /*min_pow_checked=*/true);
4554 [ # # ]: 0 : LOCK(cs_main); // hold cs_main for CBlockIndex::IsValid()
4555 [ # # # # : 0 : if (pindex->IsValid(BLOCK_VALID_TRANSACTIONS)) {
# # ]
4556 : : // Clear download state for this block, which is in
4557 : : // process from some other peer. We do this after calling
4558 : : // ProcessNewBlock so that a malleated cmpctblock announcement
4559 : : // can't be used to interfere with block relay.
4560 [ # # # # ]: 0 : RemoveBlockRequest(pblock->GetHash(), std::nullopt);
4561 : : }
4562 : 0 : }
4563 : 0 : return;
4564 : 4610 : }
4565 : :
4566 [ + + ]: 27668 : if (msg_type == NetMsgType::BLOCKTXN)
4567 : : {
4568 : : // Ignore blocktxn received while importing
4569 [ - + ]: 218 : if (m_chainman.m_blockman.LoadingBlocks()) {
4570 [ # # # # : 0 : LogDebug(BCLog::NET, "Unexpected blocktxn message received from peer %d\n", pfrom.GetId());
# # ]
4571 : 0 : return;
4572 : : }
4573 : :
4574 : 218 : BlockTransactions resp;
4575 [ + + ]: 218 : vRecv >> resp;
4576 : :
4577 [ + - ]: 43 : return ProcessCompactBlockTxns(pfrom, *peer, resp);
4578 : 218 : }
4579 : :
4580 [ + + ]: 27450 : if (msg_type == NetMsgType::HEADERS)
4581 : : {
4582 : : // Ignore headers received while importing
4583 [ - + ]: 11994 : if (m_chainman.m_blockman.LoadingBlocks()) {
4584 [ # # # # : 0 : LogDebug(BCLog::NET, "Unexpected headers message received from peer %d\n", pfrom.GetId());
# # ]
4585 : 0 : return;
4586 : : }
4587 : :
4588 : 11994 : std::vector<CBlockHeader> headers;
4589 : :
4590 : : // Bypass the normal CBlock deserialization, as we don't want to risk deserializing 2000 full blocks.
4591 [ + + ]: 11994 : unsigned int nCount = ReadCompactSize(vRecv);
4592 [ + + ]: 11934 : if (nCount > m_opts.max_headers_result) {
4593 [ + - + - ]: 56 : Misbehaving(*peer, strprintf("headers message size = %u", nCount));
4594 : 56 : return;
4595 : : }
4596 [ + - ]: 11878 : headers.resize(nCount);
4597 [ + + ]: 139064 : for (unsigned int n = 0; n < nCount; n++) {
4598 [ + + ]: 127707 : vRecv >> headers[n];
4599 [ + + ]: 127245 : ReadCompactSize(vRecv); // ignore tx count; assume it is 0.
4600 : : }
4601 : :
4602 [ + - ]: 11357 : ProcessHeadersMessage(pfrom, *peer, std::move(headers), /*via_compact_block=*/false);
4603 : :
4604 : : // Check if the headers presync progress needs to be reported to validation.
4605 : : // This needs to be done without holding the m_headers_presync_mutex lock.
4606 [ + + ]: 11357 : if (m_headers_presync_should_signal.exchange(false)) {
4607 : 3585 : HeadersPresyncStats stats;
4608 : 3585 : {
4609 [ + - ]: 3585 : LOCK(m_headers_presync_mutex);
4610 : 3585 : auto it = m_headers_presync_stats.find(m_headers_presync_bestpeer);
4611 [ + - ]: 3585 : if (it != m_headers_presync_stats.end()) stats = it->second;
4612 : 3585 : }
4613 [ + - ]: 3585 : if (stats.second) {
4614 [ + - ]: 3585 : m_chainman.ReportHeadersPresync(stats.first, stats.second->first, stats.second->second);
4615 : : }
4616 : : }
4617 : :
4618 : 11357 : return;
4619 : 11994 : }
4620 : :
4621 [ + + ]: 15456 : if (msg_type == NetMsgType::BLOCK)
4622 : : {
4623 : : // Ignore block received while importing
4624 [ - + ]: 9960 : if (m_chainman.m_blockman.LoadingBlocks()) {
4625 [ # # # # : 0 : LogDebug(BCLog::NET, "Unexpected block message received from peer %d\n", pfrom.GetId());
# # ]
4626 : 0 : return;
4627 : : }
4628 : :
4629 [ + - ]: 9960 : std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
4630 [ + + ]: 9960 : vRecv >> TX_WITH_WITNESS(*pblock);
4631 : :
4632 [ + - - + : 9670 : LogDebug(BCLog::NET, "received block %s peer=%d\n", pblock->GetHash().ToString(), pfrom.GetId());
- - - - -
- ]
4633 : :
4634 [ + - + - : 29010 : const CBlockIndex* prev_block{WITH_LOCK(m_chainman.GetMutex(), return m_chainman.m_blockman.LookupBlockIndex(pblock->hashPrevBlock))};
+ - ]
4635 : :
4636 : : // Check for possible mutation if it connects to something we know so we can check for DEPLOYMENT_SEGWIT being active
4637 [ + + + - : 15397 : if (prev_block && IsBlockMutated(/*block=*/*pblock,
+ + ]
4638 : 5727 : /*check_witness_root=*/DeploymentActiveAfter(prev_block, m_chainman, Consensus::DEPLOYMENT_SEGWIT))) {
4639 [ + - - + : 70 : LogDebug(BCLog::NET, "Received mutated block from peer=%d\n", peer->m_id);
- - ]
4640 [ + - + - ]: 70 : Misbehaving(*peer, "mutated block");
4641 [ + - + - : 210 : WITH_LOCK(cs_main, RemoveBlockRequest(pblock->GetHash(), peer->m_id));
+ - ]
4642 : : return;
4643 : : }
4644 : :
4645 : 9600 : bool forceProcessing = false;
4646 [ + - ]: 9600 : const uint256 hash(pblock->GetHash());
4647 : 9600 : bool min_pow_checked = false;
4648 : 9600 : {
4649 [ + - ]: 9600 : LOCK(cs_main);
4650 : : // Always process the block if we requested it, since we may
4651 : : // need it even when it's not a candidate for a new best tip.
4652 : 9600 : forceProcessing = IsBlockRequested(hash);
4653 [ + - ]: 9600 : RemoveBlockRequest(hash, pfrom.GetId());
4654 : : // mapBlockSource is only used for punishing peers and setting
4655 : : // which peers send us compact blocks, so the race between here and
4656 : : // cs_main in ProcessNewBlock is fine.
4657 [ + - ]: 9600 : mapBlockSource.emplace(hash, std::make_pair(pfrom.GetId(), true));
4658 : :
4659 : : // Check claimed work on this block against our anti-dos thresholds.
4660 [ + + + - : 9600 : if (prev_block && prev_block->nChainWork + CalculateClaimedHeadersWork({{pblock->GetBlockHeader()}}) >= GetAntiDoSWorkThreshold()) {
+ - + - +
+ ]
4661 : : min_pow_checked = true;
4662 : : }
4663 : 0 : }
4664 [ + - + - ]: 19200 : ProcessBlock(pfrom, pblock, forceProcessing, min_pow_checked);
4665 : 9600 : return;
4666 : 9960 : }
4667 : :
4668 [ + + ]: 5496 : if (msg_type == NetMsgType::GETADDR) {
4669 : : // This asymmetric behavior for inbound and outbound connections was introduced
4670 : : // to prevent a fingerprinting attack: an attacker can send specific fake addresses
4671 : : // to users' AddrMan and later request them by sending getaddr messages.
4672 : : // Making nodes which are behind NAT and can only make outgoing connections ignore
4673 : : // the getaddr message mitigates the attack.
4674 [ + + ]: 405 : if (!pfrom.IsInboundConn()) {
4675 [ + - - + : 78 : LogDebug(BCLog::NET, "Ignoring \"getaddr\" from %s connection. peer=%d\n", pfrom.ConnectionTypeAsString(), pfrom.GetId());
- - - - ]
4676 : 78 : return;
4677 : : }
4678 : :
4679 : : // Since this must be an inbound connection, SetupAddressRelay will
4680 : : // never fail.
4681 [ + - + - ]: 327 : Assume(SetupAddressRelay(pfrom, *peer));
4682 : :
4683 : : // Only send one GetAddr response per connection to reduce resource waste
4684 : : // and discourage addr stamping of INV announcements.
4685 [ + + ]: 327 : if (peer->m_getaddr_recvd) {
4686 [ + - - + : 117 : LogDebug(BCLog::NET, "Ignoring repeated \"getaddr\". peer=%d\n", pfrom.GetId());
- - ]
4687 : 117 : return;
4688 : : }
4689 : 210 : peer->m_getaddr_recvd = true;
4690 : :
4691 : 210 : peer->m_addrs_to_send.clear();
4692 : 210 : std::vector<CAddress> vAddr;
4693 [ + + ]: 210 : if (pfrom.HasPermission(NetPermissionFlags::Addr)) {
4694 [ + - ]: 90 : vAddr = m_connman.GetAddressesUnsafe(MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND, /*network=*/std::nullopt);
4695 : : } else {
4696 [ + - ]: 330 : vAddr = m_connman.GetAddresses(pfrom, MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND);
4697 : : }
4698 [ - + ]: 210 : for (const CAddress &addr : vAddr) {
4699 [ # # ]: 0 : PushAddress(*peer, addr);
4700 : : }
4701 : 210 : return;
4702 : 210 : }
4703 : :
4704 [ + + ]: 5091 : if (msg_type == NetMsgType::MEMPOOL) {
4705 : : // Only process received mempool messages if we advertise NODE_BLOOM
4706 : : // or if the peer has mempool permissions.
4707 [ + + + + ]: 136 : if (!(peer->m_our_services & NODE_BLOOM) && !pfrom.HasPermission(NetPermissionFlags::Mempool))
4708 : : {
4709 [ + + ]: 43 : if (!pfrom.HasPermission(NetPermissionFlags::NoBan))
4710 : : {
4711 [ + - - + : 7 : LogDebug(BCLog::NET, "mempool request with bloom filters disabled, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
4712 : 7 : pfrom.fDisconnect = true;
4713 : : }
4714 : 43 : return;
4715 : : }
4716 : :
4717 [ + - - + : 93 : if (m_connman.OutboundTargetReached(false) && !pfrom.HasPermission(NetPermissionFlags::Mempool))
- - ]
4718 : : {
4719 [ # # ]: 0 : if (!pfrom.HasPermission(NetPermissionFlags::NoBan))
4720 : : {
4721 [ # # # # : 0 : LogDebug(BCLog::NET, "mempool request with bandwidth limit reached, %s\n", pfrom.DisconnectMsg(fLogIPs));
# # # # ]
4722 : 0 : pfrom.fDisconnect = true;
4723 : : }
4724 : 0 : return;
4725 : : }
4726 : :
4727 [ + - + + ]: 93 : if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
4728 [ + - ]: 57 : LOCK(tx_relay->m_tx_inventory_mutex);
4729 [ + - ]: 57 : tx_relay->m_send_mempool = true;
4730 : 57 : }
4731 : 93 : return;
4732 : : }
4733 : :
4734 [ + + ]: 4955 : if (msg_type == NetMsgType::PING) {
4735 [ + + ]: 145 : if (pfrom.GetCommonVersion() > BIP0031_VERSION) {
4736 : 107 : uint64_t nonce = 0;
4737 [ + + ]: 107 : vRecv >> nonce;
4738 : : // Echo the message back with the nonce. This allows for two useful features:
4739 : : //
4740 : : // 1) A remote node can quickly check if the connection is operational
4741 : : // 2) Remote nodes can measure the latency of the network thread. If this node
4742 : : // is overloaded it won't respond to pings quickly and the remote node can
4743 : : // avoid sending us more work, like chain download requests.
4744 : : //
4745 : : // The nonce stops the remote getting confused between different pings: without
4746 : : // it, if the remote node sends a ping once per second and this node takes 5
4747 : : // seconds to respond to each, the 5th ping the remote sends would appear to
4748 : : // return very quickly.
4749 [ + - + - ]: 138 : MakeAndPushMessage(pfrom, NetMsgType::PONG, nonce);
4750 : : }
4751 : 107 : return;
4752 : : }
4753 : :
4754 [ + + ]: 4810 : if (msg_type == NetMsgType::PONG) {
4755 : 158 : const auto ping_end = time_received;
4756 : 158 : uint64_t nonce = 0;
4757 [ - + ]: 158 : size_t nAvail = vRecv.in_avail();
4758 : 158 : bool bPingFinished = false;
4759 [ + + ]: 158 : std::string sProblem;
4760 : :
4761 [ + + ]: 158 : if (nAvail >= sizeof(nonce)) {
4762 [ + - ]: 116 : vRecv >> nonce;
4763 : :
4764 : : // Only process pong message if there is an outstanding ping (old ping without nonce should never pong)
4765 [ + + ]: 116 : if (peer->m_ping_nonce_sent != 0) {
4766 [ + + ]: 57 : if (nonce == peer->m_ping_nonce_sent) {
4767 : : // Matching pong received, this ping is no longer outstanding
4768 : 4 : bPingFinished = true;
4769 [ + + ]: 4 : const auto ping_time = ping_end - peer->m_ping_start.load();
4770 [ + + ]: 4 : if (ping_time.count() >= 0) {
4771 : : // Let connman know about this successful ping-pong
4772 : 2 : pfrom.PongReceived(ping_time);
4773 : : } else {
4774 : : // This should never happen
4775 [ + - ]: 2 : sProblem = "Timing mishap";
4776 : : }
4777 : : } else {
4778 : : // Nonce mismatches are normal when pings are overlapping
4779 [ + - ]: 53 : sProblem = "Nonce mismatch";
4780 [ + + ]: 53 : if (nonce == 0) {
4781 : : // This is most likely a bug in another implementation somewhere; cancel this ping
4782 : 7 : bPingFinished = true;
4783 [ + - ]: 7 : sProblem = "Nonce zero";
4784 : : }
4785 : : }
4786 : : } else {
4787 [ + - ]: 59 : sProblem = "Unsolicited pong without ping";
4788 : : }
4789 : : } else {
4790 : : // This is most likely a bug in another implementation somewhere; cancel this ping
4791 : 42 : bPingFinished = true;
4792 [ + - ]: 42 : sProblem = "Short payload";
4793 : : }
4794 : :
4795 [ + + ]: 158 : if (!(sProblem.empty())) {
4796 [ + - - + : 156 : LogDebug(BCLog::NET, "pong peer=%d: %s, %x expected, %x received, %u bytes\n",
- - ]
4797 : : pfrom.GetId(),
4798 : : sProblem,
4799 : : peer->m_ping_nonce_sent,
4800 : : nonce,
4801 : : nAvail);
4802 : : }
4803 [ + + ]: 158 : if (bPingFinished) {
4804 : 53 : peer->m_ping_nonce_sent = 0;
4805 : : }
4806 : 158 : return;
4807 : 158 : }
4808 : :
4809 [ + + ]: 4652 : if (msg_type == NetMsgType::FILTERLOAD) {
4810 [ + + ]: 549 : if (!(peer->m_our_services & NODE_BLOOM)) {
4811 [ + - - + : 10 : LogDebug(BCLog::NET, "filterload received despite not offering bloom services, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
4812 : 10 : pfrom.fDisconnect = true;
4813 : 10 : return;
4814 : : }
4815 [ + + ]: 539 : CBloomFilter filter;
4816 [ + + ]: 539 : vRecv >> filter;
4817 : :
4818 [ + - + + ]: 433 : if (!filter.IsWithinSizeConstraints())
4819 : : {
4820 : : // There is no excuse for sending a too-large filter
4821 [ + - + - ]: 124 : Misbehaving(*peer, "too-large bloom filter");
4822 [ + - + + ]: 371 : } else if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
4823 : 331 : {
4824 [ + - ]: 331 : LOCK(tx_relay->m_bloom_filter_mutex);
4825 [ + - + - : 331 : tx_relay->m_bloom_filter.reset(new CBloomFilter(filter));
+ + ]
4826 [ + - ]: 331 : tx_relay->m_relay_txs = true;
4827 : 0 : }
4828 : 331 : pfrom.m_bloom_filter_loaded = true;
4829 : 331 : pfrom.m_relays_txs = true;
4830 : : }
4831 : 433 : return;
4832 : 539 : }
4833 : :
4834 [ + + ]: 4103 : if (msg_type == NetMsgType::FILTERADD) {
4835 [ + + ]: 377 : if (!(peer->m_our_services & NODE_BLOOM)) {
4836 [ + - - + : 11 : LogDebug(BCLog::NET, "filteradd received despite not offering bloom services, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
4837 : 11 : pfrom.fDisconnect = true;
4838 : 11 : return;
4839 : : }
4840 : 366 : std::vector<unsigned char> vData;
4841 [ + + ]: 366 : vRecv >> vData;
4842 : :
4843 : : // Nodes must NEVER send a data item > MAX_SCRIPT_ELEMENT_SIZE bytes (the max size for a script data object,
4844 : : // and thus, the maximum size any matched object can have) in a filteradd message
4845 : 256 : bool bad = false;
4846 [ - + + + ]: 256 : if (vData.size() > MAX_SCRIPT_ELEMENT_SIZE) {
4847 : : bad = true;
4848 [ + - + + ]: 220 : } else if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
4849 [ + - ]: 184 : LOCK(tx_relay->m_bloom_filter_mutex);
4850 [ + + ]: 184 : if (tx_relay->m_bloom_filter) {
4851 [ - + + - ]: 136 : tx_relay->m_bloom_filter->insert(vData);
4852 : : } else {
4853 : : bad = true;
4854 : : }
4855 : 0 : }
4856 [ + + ]: 184 : if (bad) {
4857 [ + - + - ]: 168 : Misbehaving(*peer, "bad filteradd message");
4858 : : }
4859 : 256 : return;
4860 : 366 : }
4861 : :
4862 [ + + ]: 3726 : if (msg_type == NetMsgType::FILTERCLEAR) {
4863 [ + + ]: 133 : if (!(peer->m_our_services & NODE_BLOOM)) {
4864 [ + - - + : 8 : LogDebug(BCLog::NET, "filterclear received despite not offering bloom services, %s\n", pfrom.DisconnectMsg(fLogIPs));
- - - - ]
4865 : 8 : pfrom.fDisconnect = true;
4866 : 8 : return;
4867 : : }
4868 [ + - ]: 125 : auto tx_relay = peer->GetTxRelay();
4869 [ + + ]: 125 : if (!tx_relay) return;
4870 : :
4871 : 90 : {
4872 [ + - ]: 90 : LOCK(tx_relay->m_bloom_filter_mutex);
4873 [ + + ]: 90 : tx_relay->m_bloom_filter = nullptr;
4874 [ + - ]: 90 : tx_relay->m_relay_txs = true;
4875 : 90 : }
4876 : 90 : pfrom.m_bloom_filter_loaded = false;
4877 : 90 : pfrom.m_relays_txs = true;
4878 : 90 : return;
4879 : : }
4880 : :
4881 [ + + ]: 3593 : if (msg_type == NetMsgType::FEEFILTER) {
4882 : 291 : CAmount newFeeFilter = 0;
4883 [ + + ]: 291 : vRecv >> newFeeFilter;
4884 [ + + ]: 244 : if (MoneyRange(newFeeFilter)) {
4885 [ + - + + ]: 146 : if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
4886 : 99 : tx_relay->m_fee_filter_received = newFeeFilter;
4887 : : }
4888 [ + - - + : 146 : LogDebug(BCLog::NET, "received: feefilter of %s from peer=%d\n", CFeeRate(newFeeFilter).ToString(), pfrom.GetId());
- - - - ]
4889 : : }
4890 : 244 : return;
4891 : : }
4892 : :
4893 [ + + ]: 3302 : if (msg_type == NetMsgType::GETCFILTERS) {
4894 [ + + ]: 44 : ProcessGetCFilters(pfrom, *peer, vRecv);
4895 : : return;
4896 : : }
4897 : :
4898 [ + + ]: 3258 : if (msg_type == NetMsgType::GETCFHEADERS) {
4899 [ + + ]: 75 : ProcessGetCFHeaders(pfrom, *peer, vRecv);
4900 : : return;
4901 : : }
4902 : :
4903 [ + + ]: 3183 : if (msg_type == NetMsgType::GETCFCHECKPT) {
4904 [ + + ]: 38 : ProcessGetCFCheckPt(pfrom, *peer, vRecv);
4905 : : return;
4906 : : }
4907 : :
4908 [ + + ]: 3145 : if (msg_type == NetMsgType::NOTFOUND) {
4909 : 528 : std::vector<CInv> vInv;
4910 [ + + ]: 528 : vRecv >> vInv;
4911 : 362 : std::vector<GenTxid> tx_invs;
4912 [ - + + + ]: 362 : if (vInv.size() <= node::MAX_PEER_TX_ANNOUNCEMENTS + MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
4913 [ + + ]: 23894 : for (CInv &inv : vInv) {
4914 [ + + ]: 47066 : if (inv.IsGenTxMsg()) {
4915 [ + - + - ]: 10419 : tx_invs.emplace_back(ToGenTxid(inv));
4916 : : }
4917 : : }
4918 : : }
4919 [ + - ]: 362 : LOCK(m_tx_download_mutex);
4920 [ + - ]: 362 : m_txdownloadman.ReceivedNotFound(pfrom.GetId(), tx_invs);
4921 [ + - ]: 362 : return;
4922 : 528 : }
4923 : :
4924 : : // Ignore unknown commands for extensibility
4925 [ + - - + : 2617 : LogDebug(BCLog::NET, "Unknown command \"%s\" from peer=%d\n", SanitizeString(msg_type), pfrom.GetId());
- - - - -
- ]
4926 : : return;
4927 : 67408 : }
4928 : :
4929 : 51889 : bool PeerManagerImpl::MaybeDiscourageAndDisconnect(CNode& pnode, Peer& peer)
4930 : : {
4931 : 51889 : {
4932 : 51889 : LOCK(peer.m_misbehavior_mutex);
4933 : :
4934 : : // There's nothing to do if the m_should_discourage flag isn't set
4935 [ + - + - ]: 51889 : if (!peer.m_should_discourage) return false;
4936 : :
4937 [ # # ]: 0 : peer.m_should_discourage = false;
4938 : 51889 : } // peer.m_misbehavior_mutex
4939 : :
4940 [ # # ]: 0 : if (pnode.HasPermission(NetPermissionFlags::NoBan)) {
4941 : : // We never disconnect or discourage peers for bad behavior if they have NetPermissionFlags::NoBan permission
4942 : 0 : LogPrintf("Warning: not punishing noban peer %d!\n", peer.m_id);
4943 : 0 : return false;
4944 : : }
4945 : :
4946 [ # # ]: 0 : if (pnode.IsManualConn()) {
4947 : : // We never disconnect or discourage manual peers for bad behavior
4948 : 0 : LogPrintf("Warning: not punishing manually connected peer %d!\n", peer.m_id);
4949 : 0 : return false;
4950 : : }
4951 : :
4952 [ # # ]: 0 : if (pnode.addr.IsLocal()) {
4953 : : // We disconnect local peers for bad behavior but don't discourage (since that would discourage
4954 : : // all peers on the same local address)
4955 [ # # # # ]: 0 : LogDebug(BCLog::NET, "Warning: disconnecting but not discouraging %s peer %d!\n",
4956 : : pnode.m_inbound_onion ? "inbound onion" : "local", peer.m_id);
4957 : 0 : pnode.fDisconnect = true;
4958 : 0 : return true;
4959 : : }
4960 : :
4961 : : // Normal case: Disconnect the peer and discourage all nodes sharing the address
4962 [ # # ]: 0 : LogDebug(BCLog::NET, "Disconnecting and discouraging peer %d!\n", peer.m_id);
4963 [ # # ]: 0 : if (m_banman) m_banman->Discourage(pnode.addr);
4964 : 0 : m_connman.DisconnectNode(pnode.addr);
4965 : 0 : return true;
4966 : : }
4967 : :
4968 : 622265 : bool PeerManagerImpl::ProcessMessages(CNode* pfrom, std::atomic<bool>& interruptMsgProc)
4969 : : {
4970 : 622265 : AssertLockNotHeld(m_tx_download_mutex);
4971 : 622265 : AssertLockHeld(g_msgproc_mutex);
4972 : :
4973 : 622265 : PeerRef peer = GetPeerRef(pfrom->GetId());
4974 [ + - ]: 622265 : if (peer == nullptr) return false;
4975 : :
4976 : : // For outbound connections, ensure that the initial VERSION message
4977 : : // has been sent first before processing any incoming messages
4978 [ + + + + ]: 622265 : if (!pfrom->IsInboundConn() && !peer->m_outbound_version_message_sent) return false;
4979 : :
4980 : 621551 : {
4981 [ + - ]: 621551 : LOCK(peer->m_getdata_requests_mutex);
4982 [ + + ]: 621551 : if (!peer->m_getdata_requests.empty()) {
4983 [ + - ]: 537235 : ProcessGetData(*pfrom, *peer, interruptMsgProc);
4984 : : }
4985 : 0 : }
4986 : :
4987 [ + - ]: 621551 : const bool processed_orphan = ProcessOrphanTx(*peer);
4988 : :
4989 [ + + ]: 621551 : if (pfrom->fDisconnect)
4990 : : return false;
4991 : :
4992 [ + - ]: 619552 : if (processed_orphan) return true;
4993 : :
4994 : : // this maintains the order of responses
4995 : : // and prevents m_getdata_requests to grow unbounded
4996 : 619552 : {
4997 [ + - ]: 619552 : LOCK(peer->m_getdata_requests_mutex);
4998 [ + + + - ]: 619552 : if (!peer->m_getdata_requests.empty()) return true;
4999 : 536164 : }
5000 : :
5001 : : // Don't bother if send buffer is too full to respond anyway
5002 [ + + ]: 83388 : if (pfrom->fPauseSend) return false;
5003 : :
5004 [ + - ]: 83184 : auto poll_result{pfrom->PollMessage()};
5005 [ + + ]: 83184 : if (!poll_result) {
5006 : : // No message to process
5007 : : return false;
5008 : : }
5009 : :
5010 [ - + ]: 78519 : CNetMessage& msg{poll_result->first};
5011 : 78519 : bool fMoreWork = poll_result->second;
5012 : :
5013 : : TRACEPOINT(net, inbound_message,
5014 : : pfrom->GetId(),
5015 : : pfrom->m_addr_name.c_str(),
5016 : : pfrom->ConnectionTypeAsString().c_str(),
5017 : : msg.m_type.c_str(),
5018 : : msg.m_recv.size(),
5019 : : msg.m_recv.data()
5020 : 78519 : );
5021 : :
5022 [ - + ]: 78519 : if (m_opts.capture_messages) {
5023 [ # # ]: 0 : CaptureMessage(pfrom->addr, msg.m_type, MakeUCharSpan(msg.m_recv), /*is_incoming=*/true);
5024 : : }
5025 : :
5026 : 78519 : try {
5027 [ + + ]: 78519 : ProcessMessage(*pfrom, msg.m_type, msg.m_recv, msg.m_time, interruptMsgProc);
5028 [ + - ]: 67408 : if (interruptMsgProc) return false;
5029 : 67408 : {
5030 [ + - ]: 67408 : LOCK(peer->m_getdata_requests_mutex);
5031 [ + + ]: 67408 : if (!peer->m_getdata_requests.empty()) fMoreWork = true;
5032 : 67408 : }
5033 : : // Does this peer has an orphan ready to reconsider?
5034 : : // (Note: we may have provided a parent for an orphan provided
5035 : : // by another peer that was already processed; in that case,
5036 : : // the extra work may not be noticed, possibly resulting in an
5037 : : // unnecessary 100ms delay)
5038 [ + - ]: 67408 : LOCK(m_tx_download_mutex);
5039 [ + - - + ]: 67408 : if (m_txdownloadman.HaveMoreWork(peer->m_id)) fMoreWork = true;
5040 [ + - ]: 78519 : } catch (const std::exception& e) {
5041 [ + - - + : 11111 : 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());
- - - - -
- - - ]
5042 : 11111 : } catch (...) {
5043 [ - - - - : 0 : LogDebug(BCLog::NET, "%s(%s, %u bytes): Unknown exception caught\n", __func__, SanitizeString(msg.m_type), msg.m_message_size);
- - - - -
- ]
5044 [ - - ]: 0 : }
5045 : :
5046 : : return fMoreWork;
5047 : 705449 : }
5048 : :
5049 : 25131 : void PeerManagerImpl::ConsiderEviction(CNode& pto, Peer& peer, std::chrono::seconds time_in_seconds)
5050 : : {
5051 : 25131 : AssertLockHeld(cs_main);
5052 : :
5053 : 25131 : CNodeState &state = *State(pto.GetId());
5054 : :
5055 [ + - + + : 25131 : if (!state.m_chain_sync.m_protect && pto.IsOutboundOrBlockRelayConn() && state.fSyncStarted) {
+ + ]
5056 : : // This is an outbound peer subject to disconnection if they don't
5057 : : // announce a block with as much work as the current tip within
5058 : : // CHAIN_SYNC_TIMEOUT + HEADERS_RESPONSE_TIME seconds (note: if
5059 : : // their chain has more work than ours, we should sync to it,
5060 : : // unless it's invalid, in which case we should find that out and
5061 : : // disconnect from them elsewhere).
5062 [ - + - - : 12952 : if (state.pindexBestKnownBlock != nullptr && state.pindexBestKnownBlock->nChainWork >= m_chainman.ActiveChain().Tip()->nChainWork) {
- - ]
5063 : : // 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
5064 [ # # ]: 0 : if (state.m_chain_sync.m_timeout != 0s) {
5065 : 0 : state.m_chain_sync.m_timeout = 0s;
5066 : 0 : state.m_chain_sync.m_work_header = nullptr;
5067 : 0 : state.m_chain_sync.m_sent_getheaders = false;
5068 : : }
5069 [ + + + - : 12952 : } 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)) {
- + - - ]
5070 : : // 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
5071 : : // AND
5072 : : // we are noticing this for the first time (m_timeout is 0)
5073 : : // OR we noticed this at some point within the last CHAIN_SYNC_TIMEOUT + HEADERS_RESPONSE_TIME seconds and set a timeout
5074 : : // 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).
5075 : : // Either way, set a new timeout based on our current tip.
5076 : 1297 : state.m_chain_sync.m_timeout = time_in_seconds + CHAIN_SYNC_TIMEOUT;
5077 [ - + ]: 1297 : state.m_chain_sync.m_work_header = m_chainman.ActiveChain().Tip();
5078 : 1297 : state.m_chain_sync.m_sent_getheaders = false;
5079 [ + - - + ]: 11655 : } else if (state.m_chain_sync.m_timeout > 0s && time_in_seconds > state.m_chain_sync.m_timeout) {
5080 : : // No evidence yet that our peer has synced to a chain with work equal to that
5081 : : // of our tip, when we first detected it was behind. Send a single getheaders
5082 : : // message to give the peer a chance to update us.
5083 [ # # ]: 0 : if (state.m_chain_sync.m_sent_getheaders) {
5084 : : // They've run out of time to catch up!
5085 [ # # # # : 0 : LogInfo("Outbound peer has old chain, best known block = %s, %s\n", state.pindexBestKnownBlock != nullptr ? state.pindexBestKnownBlock->GetBlockHash().ToString() : "<none>", pto.DisconnectMsg(fLogIPs));
# # # # ]
5086 : 0 : pto.fDisconnect = true;
5087 : : } else {
5088 [ # # ]: 0 : assert(state.m_chain_sync.m_work_header);
5089 : : // Here, we assume that the getheaders message goes out,
5090 : : // because it'll either go out or be skipped because of a
5091 : : // getheaders in-flight already, in which case the peer should
5092 : : // still respond to us with a sufficiently high work chain tip.
5093 [ # # ]: 0 : MaybeSendGetHeaders(pto,
5094 : 0 : GetLocator(state.m_chain_sync.m_work_header->pprev),
5095 : : peer);
5096 [ # # # # : 0 : 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());
# # # # #
# ]
5097 : 0 : state.m_chain_sync.m_sent_getheaders = true;
5098 : : // Bump the timeout to allow a response, which could clear the timeout
5099 : : // (if the response shows the peer has synced), reset the timeout (if
5100 : : // the peer syncs to the required work but not to our tip), or result
5101 : : // in disconnect (if we advance to the timeout and pindexBestKnownBlock
5102 : : // has not sufficiently progressed)
5103 : 0 : state.m_chain_sync.m_timeout = time_in_seconds + HEADERS_RESPONSE_TIME;
5104 : : }
5105 : : }
5106 : : }
5107 : 25131 : }
5108 : :
5109 : 0 : void PeerManagerImpl::EvictExtraOutboundPeers(std::chrono::seconds now)
5110 : : {
5111 : : // If we have any extra block-relay-only peers, disconnect the youngest unless
5112 : : // it's given us a block -- in which case, compare with the second-youngest, and
5113 : : // out of those two, disconnect the peer who least recently gave us a block.
5114 : : // The youngest block-relay-only peer would be the extra peer we connected
5115 : : // to temporarily in order to sync our tip; see net.cpp.
5116 : : // Note that we use higher nodeid as a measure for most recent connection.
5117 [ # # ]: 0 : if (m_connman.GetExtraBlockRelayCount() > 0) {
5118 : 0 : std::pair<NodeId, std::chrono::seconds> youngest_peer{-1, 0}, next_youngest_peer{-1, 0};
5119 : :
5120 [ # # ]: 0 : m_connman.ForEachNode([&](CNode* pnode) {
5121 [ # # # # ]: 0 : if (!pnode->IsBlockOnlyConn() || pnode->fDisconnect) return;
5122 [ # # ]: 0 : if (pnode->GetId() > youngest_peer.first) {
5123 : 0 : next_youngest_peer = youngest_peer;
5124 : 0 : youngest_peer.first = pnode->GetId();
5125 : 0 : youngest_peer.second = pnode->m_last_block_time;
5126 : : }
5127 : : });
5128 : 0 : NodeId to_disconnect = youngest_peer.first;
5129 [ # # ]: 0 : if (youngest_peer.second > next_youngest_peer.second) {
5130 : : // Our newest block-relay-only peer gave us a block more recently;
5131 : : // disconnect our second youngest.
5132 : 0 : to_disconnect = next_youngest_peer.first;
5133 : : }
5134 [ # # ]: 0 : m_connman.ForNode(to_disconnect, [&](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
5135 : 0 : AssertLockHeld(::cs_main);
5136 : : // Make sure we're not getting a block right now, and that
5137 : : // we've been connected long enough for this eviction to happen
5138 : : // at all.
5139 : : // Note that we only request blocks from a peer if we learn of a
5140 : : // valid headers chain with at least as much work as our tip.
5141 : 0 : CNodeState *node_state = State(pnode->GetId());
5142 [ # # # # ]: 0 : if (node_state == nullptr ||
5143 [ # # # # ]: 0 : (now - pnode->m_connected >= MINIMUM_CONNECT_TIME && node_state->vBlocksInFlight.empty())) {
5144 : 0 : pnode->fDisconnect = true;
5145 [ # # ]: 0 : LogDebug(BCLog::NET, "disconnecting extra block-relay-only peer=%d (last block received at time %d)\n",
5146 : : pnode->GetId(), count_seconds(pnode->m_last_block_time));
5147 : 0 : return true;
5148 : : } else {
5149 [ # # ]: 0 : LogDebug(BCLog::NET, "keeping block-relay-only peer=%d chosen for eviction (connect time: %d, blocks_in_flight: %d)\n",
5150 : : pnode->GetId(), count_seconds(pnode->m_connected), node_state->vBlocksInFlight.size());
5151 : : }
5152 : : return false;
5153 : : });
5154 : : }
5155 : :
5156 : : // Check whether we have too many outbound-full-relay peers
5157 [ # # ]: 0 : if (m_connman.GetExtraFullOutboundCount() > 0) {
5158 : : // If we have more outbound-full-relay peers than we target, disconnect one.
5159 : : // Pick the outbound-full-relay peer that least recently announced
5160 : : // us a new block, with ties broken by choosing the more recent
5161 : : // connection (higher node id)
5162 : : // Protect peers from eviction if we don't have another connection
5163 : : // to their network, counting both outbound-full-relay and manual peers.
5164 : 0 : NodeId worst_peer = -1;
5165 : 0 : int64_t oldest_block_announcement = std::numeric_limits<int64_t>::max();
5166 : :
5167 [ # # ]: 0 : m_connman.ForEachNode([&](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main, m_connman.GetNodesMutex()) {
5168 : 0 : AssertLockHeld(::cs_main);
5169 : :
5170 : : // Only consider outbound-full-relay peers that are not already
5171 : : // marked for disconnection
5172 [ # # # # ]: 0 : if (!pnode->IsFullOutboundConn() || pnode->fDisconnect) return;
5173 : 0 : CNodeState *state = State(pnode->GetId());
5174 [ # # ]: 0 : if (state == nullptr) return; // shouldn't be possible, but just in case
5175 : : // Don't evict our protected peers
5176 [ # # ]: 0 : if (state->m_chain_sync.m_protect) return;
5177 : : // If this is the only connection on a particular network that is
5178 : : // OUTBOUND_FULL_RELAY or MANUAL, protect it.
5179 [ # # ]: 0 : if (!m_connman.MultipleManualOrFullOutboundConns(pnode->addr.GetNetwork())) return;
5180 [ # # # # : 0 : if (state->m_last_block_announcement < oldest_block_announcement || (state->m_last_block_announcement == oldest_block_announcement && pnode->GetId() > worst_peer)) {
# # ]
5181 : 0 : worst_peer = pnode->GetId();
5182 : 0 : oldest_block_announcement = state->m_last_block_announcement;
5183 : : }
5184 : : });
5185 [ # # ]: 0 : if (worst_peer != -1) {
5186 [ # # ]: 0 : bool disconnected = m_connman.ForNode(worst_peer, [&](CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
5187 : 0 : AssertLockHeld(::cs_main);
5188 : :
5189 : : // Only disconnect a peer that has been connected to us for
5190 : : // some reasonable fraction of our check-frequency, to give
5191 : : // it time for new information to have arrived.
5192 : : // Also don't disconnect any peer we're trying to download a
5193 : : // block from.
5194 : 0 : CNodeState &state = *State(pnode->GetId());
5195 [ # # # # ]: 0 : if (now - pnode->m_connected > MINIMUM_CONNECT_TIME && state.vBlocksInFlight.empty()) {
5196 [ # # ]: 0 : LogDebug(BCLog::NET, "disconnecting extra outbound peer=%d (last block announcement received at time %d)\n", pnode->GetId(), oldest_block_announcement);
5197 : 0 : pnode->fDisconnect = true;
5198 : 0 : return true;
5199 : : } else {
5200 [ # # ]: 0 : LogDebug(BCLog::NET, "keeping outbound peer=%d chosen for eviction (connect time: %d, blocks_in_flight: %d)\n",
5201 : : pnode->GetId(), count_seconds(pnode->m_connected), state.vBlocksInFlight.size());
5202 : 0 : return false;
5203 : : }
5204 : : });
5205 [ # # ]: 0 : if (disconnected) {
5206 : : // If we disconnected an extra peer, that means we successfully
5207 : : // connected to at least one peer after the last time we
5208 : : // detected a stale tip. Don't try any more extra peers until
5209 : : // we next detect a stale tip, to limit the load we put on the
5210 : : // network from these extra connections.
5211 : 0 : m_connman.SetTryNewOutboundPeer(false);
5212 : : }
5213 : : }
5214 : : }
5215 : 0 : }
5216 : :
5217 : 0 : void PeerManagerImpl::CheckForStaleTipAndEvictPeers()
5218 : : {
5219 : 0 : LOCK(cs_main);
5220 : :
5221 : 0 : auto now{GetTime<std::chrono::seconds>()};
5222 : :
5223 [ # # ]: 0 : EvictExtraOutboundPeers(now);
5224 : :
5225 [ # # ]: 0 : if (now > m_stale_tip_check_time) {
5226 : : // Check whether our tip is stale, and if so, allow using an extra
5227 : : // outbound peer
5228 [ # # # # : 0 : if (!m_chainman.m_blockman.LoadingBlocks() && m_connman.GetNetworkActive() && m_connman.GetUseAddrmanOutgoing() && TipMayBeStale()) {
# # # # ]
5229 [ # # ]: 0 : LogPrintf("Potential stale tip detected, will try using extra outbound peer (last tip update: %d seconds ago)\n",
5230 : : count_seconds(now - m_last_tip_update.load()));
5231 [ # # ]: 0 : m_connman.SetTryNewOutboundPeer(true);
5232 [ # # # # ]: 0 : } else if (m_connman.GetTryNewOutboundPeer()) {
5233 [ # # ]: 0 : m_connman.SetTryNewOutboundPeer(false);
5234 : : }
5235 : 0 : m_stale_tip_check_time = now + STALE_CHECK_INTERVAL;
5236 : : }
5237 : :
5238 [ # # # # : 0 : if (!m_initial_sync_finished && CanDirectFetch()) {
# # ]
5239 [ # # ]: 0 : m_connman.StartExtraBlockRelayPeers();
5240 : 0 : m_initial_sync_finished = true;
5241 : : }
5242 : 0 : }
5243 : :
5244 : 25159 : void PeerManagerImpl::MaybeSendPing(CNode& node_to, Peer& peer, std::chrono::microseconds now)
5245 : : {
5246 [ - + ]: 25380 : if (m_connman.ShouldRunInactivityChecks(node_to, std::chrono::duration_cast<std::chrono::seconds>(now)) &&
5247 [ + + - + : 25159 : peer.m_ping_nonce_sent &&
- - ]
5248 [ # # ]: 0 : now > peer.m_ping_start.load() + TIMEOUT_INTERVAL)
5249 : : {
5250 : : // The ping timeout is using mocktime. To disable the check during
5251 : : // testing, increase -peertimeout.
5252 [ # # # # ]: 0 : LogDebug(BCLog::NET, "ping timeout: %fs, %s", 0.000001 * count_microseconds(now - peer.m_ping_start.load()), node_to.DisconnectMsg(fLogIPs));
5253 : 0 : node_to.fDisconnect = true;
5254 : 0 : return;
5255 : : }
5256 : :
5257 : 25159 : bool pingSend = false;
5258 : :
5259 [ - + ]: 25159 : if (peer.m_ping_queued) {
5260 : : // RPC ping request by user
5261 : 0 : pingSend = true;
5262 : : }
5263 : :
5264 [ + + - + ]: 25159 : if (peer.m_ping_nonce_sent == 0 && now > peer.m_ping_start.load() + PING_INTERVAL) {
5265 : : // Ping automatically sent as a latency probe & keepalive.
5266 : : pingSend = true;
5267 : : }
5268 : :
5269 [ + + ]: 25159 : if (pingSend) {
5270 : 5870 : uint64_t nonce;
5271 : 5870 : do {
5272 : 5870 : nonce = FastRandomContext().rand64();
5273 [ - + ]: 5870 : } while (nonce == 0);
5274 : 5870 : peer.m_ping_queued = false;
5275 : 5870 : peer.m_ping_start = now;
5276 [ + + ]: 5870 : if (node_to.GetCommonVersion() > BIP0031_VERSION) {
5277 : 5171 : peer.m_ping_nonce_sent = nonce;
5278 [ + - ]: 10342 : MakeAndPushMessage(node_to, NetMsgType::PING, nonce);
5279 : : } else {
5280 : : // Peer is too old to support ping command with nonce, pong will never arrive.
5281 : 699 : peer.m_ping_nonce_sent = 0;
5282 [ + - ]: 1398 : MakeAndPushMessage(node_to, NetMsgType::PING);
5283 : : }
5284 : : }
5285 : : }
5286 : :
5287 : 25131 : void PeerManagerImpl::MaybeSendAddr(CNode& node, Peer& peer, std::chrono::microseconds current_time)
5288 : : {
5289 : : // Nothing to do for non-address-relay peers
5290 [ + + ]: 25131 : if (!peer.m_addr_relay_enabled) return;
5291 : :
5292 : 10284 : LOCK(peer.m_addr_send_times_mutex);
5293 : : // Periodically advertise our local address to the peer.
5294 [ + - + - : 10284 : if (fListen && !m_chainman.IsInitialBlockDownload() &&
- + - - ]
5295 [ # # ]: 0 : peer.m_next_local_addr_send < current_time) {
5296 : : // If we've sent before, clear the bloom filter for the peer, so that our
5297 : : // self-announcement will actually go out.
5298 : : // This might be unnecessary if the bloom filter has already rolled
5299 : : // over since our last self-announcement, but there is only a small
5300 : : // bandwidth cost that we can incur by doing this (which happens
5301 : : // once a day on average).
5302 [ # # ]: 0 : if (peer.m_next_local_addr_send != 0us) {
5303 [ # # ]: 0 : peer.m_addr_known->reset();
5304 : : }
5305 [ # # # # ]: 0 : if (std::optional<CService> local_service = GetLocalAddrForPeer(node)) {
5306 : 0 : CAddress local_addr{*local_service, peer.m_our_services, Now<NodeSeconds>()};
5307 [ # # ]: 0 : PushAddress(peer, local_addr);
5308 : 0 : }
5309 : 0 : peer.m_next_local_addr_send = current_time + m_rng.rand_exp_duration(AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL);
5310 : : }
5311 : :
5312 : : // We sent an `addr` message to this peer recently. Nothing more to do.
5313 [ + + ]: 10284 : if (current_time <= peer.m_next_addr_send) return;
5314 : :
5315 [ - + ]: 2318 : peer.m_next_addr_send = current_time + m_rng.rand_exp_duration(AVG_ADDRESS_BROADCAST_INTERVAL);
5316 : :
5317 [ - + + - : 2318 : if (!Assume(peer.m_addrs_to_send.size() <= MAX_ADDR_TO_SEND)) {
- + ]
5318 : : // Should be impossible since we always check size before adding to
5319 : : // m_addrs_to_send. Recover by trimming the vector.
5320 [ # # ]: 0 : peer.m_addrs_to_send.resize(MAX_ADDR_TO_SEND);
5321 : : }
5322 : :
5323 : : // Remove addr records that the peer already knows about, and add new
5324 : : // addrs to the m_addr_known filter on the same pass.
5325 : 2318 : auto addr_already_known = [&peer](const CAddress& addr) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex) {
5326 [ # # # # ]: 0 : bool ret = peer.m_addr_known->contains(addr.GetKey());
5327 [ # # # # : 0 : if (!ret) peer.m_addr_known->insert(addr.GetKey());
# # ]
5328 : 0 : return ret;
5329 : 2318 : };
5330 : 2318 : peer.m_addrs_to_send.erase(std::remove_if(peer.m_addrs_to_send.begin(), peer.m_addrs_to_send.end(), addr_already_known),
5331 [ + - ]: 2318 : peer.m_addrs_to_send.end());
5332 : :
5333 : : // No addr messages to send
5334 [ - + ]: 2318 : if (peer.m_addrs_to_send.empty()) return;
5335 : :
5336 [ # # ]: 0 : if (peer.m_wants_addrv2) {
5337 [ # # # # ]: 0 : MakeAndPushMessage(node, NetMsgType::ADDRV2, CAddress::V2_NETWORK(peer.m_addrs_to_send));
5338 : : } else {
5339 [ # # # # ]: 0 : MakeAndPushMessage(node, NetMsgType::ADDR, CAddress::V1_NETWORK(peer.m_addrs_to_send));
5340 : : }
5341 : 0 : peer.m_addrs_to_send.clear();
5342 : :
5343 : : // we only send the big addr message once
5344 [ # # # # ]: 0 : if (peer.m_addrs_to_send.capacity() > 40) {
5345 : 0 : peer.m_addrs_to_send.shrink_to_fit();
5346 : : }
5347 : 10284 : }
5348 : :
5349 : 25131 : void PeerManagerImpl::MaybeSendSendHeaders(CNode& node, Peer& peer)
5350 : : {
5351 : : // Delay sending SENDHEADERS (BIP 130) until we're done with an
5352 : : // initial-headers-sync with this peer. Receiving headers announcements for
5353 : : // new blocks while trying to sync their headers chain is problematic,
5354 : : // because of the state tracking done.
5355 [ + - + + ]: 25131 : if (!peer.m_sent_sendheaders && node.GetCommonVersion() >= SENDHEADERS_VERSION) {
5356 : 24423 : LOCK(cs_main);
5357 : 24423 : CNodeState &state = *State(node.GetId());
5358 [ - + - - ]: 24423 : if (state.pindexBestKnownBlock != nullptr &&
5359 [ # # # # ]: 0 : state.pindexBestKnownBlock->nChainWork > m_chainman.MinimumChainWork()) {
5360 : : // Tell our peer we prefer to receive headers rather than inv's
5361 : : // We send this to non-NODE NETWORK peers as well, because even
5362 : : // non-NODE NETWORK peers can announce blocks (such as pruning
5363 : : // nodes)
5364 [ # # # # ]: 0 : MakeAndPushMessage(node, NetMsgType::SENDHEADERS);
5365 : 0 : peer.m_sent_sendheaders = true;
5366 : : }
5367 : 24423 : }
5368 : 25131 : }
5369 : :
5370 : 25131 : void PeerManagerImpl::MaybeSendFeefilter(CNode& pto, Peer& peer, std::chrono::microseconds current_time)
5371 : : {
5372 [ + + ]: 25131 : if (m_opts.ignore_incoming_txs) return;
5373 [ + + ]: 4459 : if (pto.GetCommonVersion() < FEEFILTER_VERSION) return;
5374 : : // peers with the forcerelay permission should not filter txs to us
5375 [ + + ]: 3751 : if (pto.HasPermission(NetPermissionFlags::ForceRelay)) return;
5376 : : // Don't send feefilter messages to outbound block-relay-only peers since they should never announce
5377 : : // transactions to us, regardless of feefilter state.
5378 [ + + ]: 2854 : if (pto.IsBlockOnlyConn()) return;
5379 : :
5380 : 2753 : CAmount currentFilter = m_mempool.GetMinFee().GetFeePerK();
5381 : :
5382 [ - + ]: 2753 : if (m_chainman.IsInitialBlockDownload()) {
5383 : : // Received tx-inv messages are discarded when the active
5384 : : // chainstate is in IBD, so tell the peer to not send them.
5385 : : currentFilter = MAX_MONEY;
5386 : : } else {
5387 [ # # # # : 0 : static const CAmount MAX_FILTER{m_fee_filter_rounder.round(MAX_MONEY)};
# # ]
5388 [ # # ]: 0 : if (peer.m_fee_filter_sent == MAX_FILTER) {
5389 : : // Send the current filter if we sent MAX_FILTER previously
5390 : : // and made it out of IBD.
5391 : 0 : peer.m_next_send_feefilter = 0us;
5392 : : }
5393 : : }
5394 [ + - ]: 2753 : if (current_time > peer.m_next_send_feefilter) {
5395 : 2753 : CAmount filterToSend = m_fee_filter_rounder.round(currentFilter);
5396 : : // We always have a fee filter of at least the min relay fee
5397 [ + - ]: 2753 : filterToSend = std::max(filterToSend, m_mempool.m_opts.min_relay_feerate.GetFeePerK());
5398 [ + - ]: 2753 : if (filterToSend != peer.m_fee_filter_sent) {
5399 [ + - ]: 2753 : MakeAndPushMessage(pto, NetMsgType::FEEFILTER, filterToSend);
5400 : 2753 : peer.m_fee_filter_sent = filterToSend;
5401 : : }
5402 : 2753 : peer.m_next_send_feefilter = current_time + m_rng.rand_exp_duration(AVG_FEEFILTER_BROADCAST_INTERVAL);
5403 : : }
5404 : : // If the fee filter has changed substantially and it's still more than MAX_FEEFILTER_CHANGE_DELAY
5405 : : // until scheduled broadcast, then move the broadcast to within MAX_FEEFILTER_CHANGE_DELAY.
5406 [ # # ]: 0 : else if (current_time + MAX_FEEFILTER_CHANGE_DELAY < peer.m_next_send_feefilter &&
5407 [ # # # # ]: 0 : (currentFilter < 3 * peer.m_fee_filter_sent / 4 || currentFilter > 4 * peer.m_fee_filter_sent / 3)) {
5408 : 0 : peer.m_next_send_feefilter = current_time + m_rng.randrange<std::chrono::microseconds>(MAX_FEEFILTER_CHANGE_DELAY);
5409 : : }
5410 : : }
5411 : :
5412 : : namespace {
5413 : : class CompareInvMempoolOrder
5414 : : {
5415 : : const CTxMemPool* m_mempool;
5416 : : public:
5417 : 4493 : explicit CompareInvMempoolOrder(CTxMemPool* mempool) : m_mempool{mempool} {}
5418 : :
5419 : 0 : bool operator()(std::set<Wtxid>::iterator a, std::set<Wtxid>::iterator b)
5420 : : {
5421 : : /* As std::make_heap produces a max-heap, we want the entries with the
5422 : : * fewest ancestors/highest fee to sort later. */
5423 : 0 : return m_mempool->CompareDepthAndScore(*b, *a);
5424 : : }
5425 : : };
5426 : : } // namespace
5427 : :
5428 : 19102 : bool PeerManagerImpl::RejectIncomingTxs(const CNode& peer) const
5429 : : {
5430 : : // block-relay-only peers may never send txs to us
5431 [ + + ]: 19102 : if (peer.IsBlockOnlyConn()) return true;
5432 [ + + ]: 18334 : if (peer.IsFeelerConn()) return true;
5433 : : // In -blocksonly mode, peers need the 'relay' permission to send txs to us
5434 [ + + + - ]: 17893 : if (m_opts.ignore_incoming_txs && !peer.HasPermission(NetPermissionFlags::Relay)) return true;
5435 : : return false;
5436 : : }
5437 : :
5438 : 7267 : bool PeerManagerImpl::SetupAddressRelay(const CNode& node, Peer& peer)
5439 : : {
5440 : : // We don't participate in addr relay with outbound block-relay-only
5441 : : // connections to prevent providing adversaries with the additional
5442 : : // information of addr traffic to infer the link.
5443 [ + + ]: 7267 : if (node.IsBlockOnlyConn()) return false;
5444 : :
5445 [ + + ]: 6593 : if (!peer.m_addr_relay_enabled.exchange(true)) {
5446 : : // During version message processing (non-block-relay-only outbound peers)
5447 : : // or on first addr-related message we have received (inbound peers), initialize
5448 : : // m_addr_known.
5449 : 4351 : peer.m_addr_known = std::make_unique<CRollingBloomFilter>(5000, 0.001);
5450 : : }
5451 : :
5452 : : return true;
5453 : : }
5454 : :
5455 : 630755 : bool PeerManagerImpl::SendMessages(CNode* pto)
5456 : : {
5457 : 630755 : AssertLockNotHeld(m_tx_download_mutex);
5458 : 630755 : AssertLockHeld(g_msgproc_mutex);
5459 : :
5460 : 630755 : PeerRef peer = GetPeerRef(pto->GetId());
5461 [ + + ]: 630755 : if (!peer) return false;
5462 : 51889 : const Consensus::Params& consensusParams = m_chainparams.GetConsensus();
5463 : :
5464 : : // We must call MaybeDiscourageAndDisconnect first, to ensure that we'll
5465 : : // disconnect misbehaving peers even before the version handshake is complete.
5466 [ + - + - ]: 51889 : if (MaybeDiscourageAndDisconnect(*pto, *peer)) return true;
5467 : :
5468 : : // Initiate version handshake for outbound connections
5469 [ + + + + ]: 51889 : if (!pto->IsInboundConn() && !peer->m_outbound_version_message_sent) {
5470 [ + - ]: 5084 : PushNodeVersion(*pto, *peer);
5471 : 5084 : peer->m_outbound_version_message_sent = true;
5472 : : }
5473 : :
5474 : : // Don't send anything until the version handshake is complete
5475 [ + + + + ]: 51889 : if (!pto->fSuccessfullyConnected || pto->fDisconnect)
5476 : 26706 : return true;
5477 : :
5478 : 25183 : const auto current_time{GetTime<std::chrono::microseconds>()};
5479 : :
5480 [ + + + + ]: 25183 : if (pto->IsAddrFetchConn() && current_time - pto->m_connected > 10 * AVG_ADDRESS_BROADCAST_INTERVAL) {
5481 [ + - - + : 24 : LogDebug(BCLog::NET, "addrfetch connection timeout, %s\n", pto->DisconnectMsg(fLogIPs));
- - - - ]
5482 : 24 : pto->fDisconnect = true;
5483 : 24 : return true;
5484 : : }
5485 : :
5486 [ + - ]: 25159 : MaybeSendPing(*pto, *peer, current_time);
5487 : :
5488 : : // MaybeSendPing may have marked peer for disconnection
5489 [ + + ]: 25159 : if (pto->fDisconnect) return true;
5490 : :
5491 [ + - ]: 25131 : MaybeSendAddr(*pto, *peer, current_time);
5492 : :
5493 [ + - ]: 25131 : MaybeSendSendHeaders(*pto, *peer);
5494 : :
5495 : 25131 : {
5496 [ + - ]: 25131 : LOCK(cs_main);
5497 : :
5498 : 25131 : CNodeState &state = *State(pto->GetId());
5499 : :
5500 : : // Start block sync
5501 [ - + ]: 25131 : if (m_chainman.m_best_header == nullptr) {
5502 [ # # # # ]: 0 : m_chainman.m_best_header = m_chainman.ActiveChain().Tip();
5503 : : }
5504 : :
5505 : : // Determine whether we might try initial headers sync or parallel
5506 : : // block download from this peer -- this mostly affects behavior while
5507 : : // in IBD (once out of IBD, we sync from all peers).
5508 : 25131 : bool sync_blocks_and_headers_from_peer = false;
5509 [ + + ]: 25131 : if (state.fPreferredDownload) {
5510 : : sync_blocks_and_headers_from_peer = true;
5511 [ + + + + ]: 11166 : } else if (CanServeBlocks(*peer) && !pto->IsAddrFetchConn()) {
5512 : : // Typically this is an inbound peer. If we don't have any outbound
5513 : : // peers, or if we aren't downloading any blocks from such peers,
5514 : : // then allow block downloads from this peer, too.
5515 : : // We prefer downloading blocks from outbound peers to avoid
5516 : : // putting undue load on (say) some home user who is just making
5517 : : // outbound connections to the network, but if our only source of
5518 : : // the latest blocks is from an inbound peer, we have to be sure to
5519 : : // eventually download it (and not just wait indefinitely for an
5520 : : // outbound peer to have it).
5521 [ + + - + ]: 8883 : if (m_num_preferred_download_peers == 0 || mapBlocksInFlight.empty()) {
5522 : : sync_blocks_and_headers_from_peer = true;
5523 : : }
5524 : : }
5525 : :
5526 [ + + + + : 25131 : if (!state.fSyncStarted && CanServeBlocks(*peer) && !m_chainman.m_blockman.LoadingBlocks()) {
+ - ]
5527 : : // Only actively request headers from a single peer, unless we're close to today.
5528 [ + + + + : 3706 : if ((nSyncStarted == 0 && sync_blocks_and_headers_from_peer) || m_chainman.m_best_header->Time() > NodeClock::now() - 24h) {
+ + ]
5529 : 3242 : const CBlockIndex* pindexStart = m_chainman.m_best_header;
5530 : : /* If possible, start at the block preceding the currently
5531 : : best known header. This ensures that we always get a
5532 : : non-empty list of headers back as long as the peer
5533 : : is up-to-date. With a non-empty response, we can initialise
5534 : : the peer's known best block. This wouldn't be possible
5535 : : if we requested starting at m_chainman.m_best_header and
5536 : : got back an empty response. */
5537 [ + + ]: 3242 : if (pindexStart->pprev)
5538 : 1714 : pindexStart = pindexStart->pprev;
5539 [ + - + - : 3242 : if (MaybeSendGetHeaders(*pto, GetLocator(pindexStart), *peer)) {
+ - ]
5540 [ + - - + : 3242 : LogDebug(BCLog::NET, "initial getheaders (%d) to peer=%d (startheight:%d)\n", pindexStart->nHeight, pto->GetId(), peer->m_starting_height);
- - ]
5541 : :
5542 : 3242 : state.fSyncStarted = true;
5543 : 3242 : peer->m_headers_sync_timeout = current_time + HEADERS_DOWNLOAD_TIMEOUT_BASE +
5544 : : (
5545 : : // Convert HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER to microseconds before scaling
5546 : : // to maintain precision
5547 : 3242 : std::chrono::microseconds{HEADERS_DOWNLOAD_TIMEOUT_PER_HEADER} *
5548 : 3242 : Ticks<std::chrono::seconds>(NodeClock::now() - m_chainman.m_best_header->Time()) / consensusParams.nPowTargetSpacing
5549 : 3242 : );
5550 : 3242 : nSyncStarted++;
5551 : : }
5552 : : }
5553 : : }
5554 : :
5555 : : //
5556 : : // Try sending block announcements via headers
5557 : : //
5558 : 25131 : {
5559 : : // If we have no more than MAX_BLOCKS_TO_ANNOUNCE in our
5560 : : // list of block hashes we're relaying, and our peer wants
5561 : : // headers announcements, then find the first header
5562 : : // not yet known to our peer but would connect, and send.
5563 : : // If no header would connect, or if we have too many
5564 : : // blocks, or if the peer doesn't want headers, just
5565 : : // add all to the inv queue.
5566 [ + - ]: 25131 : LOCK(peer->m_block_inv_mutex);
5567 : 25131 : std::vector<CBlock> vHeaders;
5568 [ + + ]: 25131 : bool fRevertToInv = ((!peer->m_prefers_headers &&
5569 [ + + + + : 25131 : (!state.m_requested_hb_cmpctblocks || peer->m_blocks_for_headers_relay.size() > 1)) ||
- + + - ]
5570 [ - + - + ]: 13 : peer->m_blocks_for_headers_relay.size() > MAX_BLOCKS_TO_ANNOUNCE);
5571 : 25131 : const CBlockIndex *pBestIndex = nullptr; // last header queued for delivery
5572 [ + - ]: 25131 : ProcessBlockAvailability(pto->GetId()); // ensure pindexBestKnownBlock is up-to-date
5573 : :
5574 [ + + ]: 25131 : if (!fRevertToInv) {
5575 : 13 : bool fFoundStartingHeader = false;
5576 : : // Try to find first header that our peer doesn't have, and
5577 : : // then send all headers past that one. If we come across any
5578 : : // headers that aren't on m_chainman.ActiveChain(), give up.
5579 [ - + ]: 13 : for (const uint256& hash : peer->m_blocks_for_headers_relay) {
5580 [ # # ]: 0 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(hash);
5581 [ # # ]: 0 : assert(pindex);
5582 [ # # # # : 0 : if (m_chainman.ActiveChain()[pindex->nHeight] != pindex) {
# # ]
5583 : : // Bail out if we reorged away from this block
5584 : : fRevertToInv = true;
5585 : : break;
5586 : : }
5587 [ # # # # ]: 0 : if (pBestIndex != nullptr && pindex->pprev != pBestIndex) {
5588 : : // This means that the list of blocks to announce don't
5589 : : // connect to each other.
5590 : : // This shouldn't really be possible to hit during
5591 : : // regular operation (because reorgs should take us to
5592 : : // a chain that has some block not on the prior chain,
5593 : : // which should be caught by the prior check), but one
5594 : : // way this could happen is by using invalidateblock /
5595 : : // reconsiderblock repeatedly on the tip, causing it to
5596 : : // be added multiple times to m_blocks_for_headers_relay.
5597 : : // Robustly deal with this rare situation by reverting
5598 : : // to an inv.
5599 : : fRevertToInv = true;
5600 : : break;
5601 : : }
5602 : 0 : pBestIndex = pindex;
5603 [ # # ]: 0 : if (fFoundStartingHeader) {
5604 : : // add this to the headers message
5605 [ # # ]: 0 : vHeaders.emplace_back(pindex->GetBlockHeader());
5606 [ # # # # ]: 0 : } else if (PeerHasHeader(&state, pindex)) {
5607 : 0 : continue; // keep looking for the first new block
5608 [ # # # # : 0 : } else if (pindex->pprev == nullptr || PeerHasHeader(&state, pindex->pprev)) {
# # ]
5609 : : // Peer doesn't have this header but they do have the prior one.
5610 : : // Start sending headers.
5611 : 0 : fFoundStartingHeader = true;
5612 [ # # ]: 0 : vHeaders.emplace_back(pindex->GetBlockHeader());
5613 : : } else {
5614 : : // Peer doesn't have this header or the prior one -- nothing will
5615 : : // connect, so bail out.
5616 : : fRevertToInv = true;
5617 : : break;
5618 : : }
5619 : : }
5620 : : }
5621 [ + - - + ]: 13 : if (!fRevertToInv && !vHeaders.empty()) {
5622 [ # # # # : 0 : if (vHeaders.size() == 1 && state.m_requested_hb_cmpctblocks) {
# # ]
5623 : : // We only send up to 1 block as header-and-ids, as otherwise
5624 : : // probably means we're doing an initial-ish-sync or they're slow
5625 [ # # # # : 0 : LogDebug(BCLog::NET, "%s sending header-and-ids %s to peer=%d\n", __func__,
# # # # #
# ]
5626 : : vHeaders.front().GetHash().ToString(), pto->GetId());
5627 : :
5628 : 0 : std::optional<CSerializedNetMsg> cached_cmpctblock_msg;
5629 : 0 : {
5630 [ # # ]: 0 : LOCK(m_most_recent_block_mutex);
5631 [ # # ]: 0 : if (m_most_recent_block_hash == pBestIndex->GetBlockHash()) {
5632 [ # # # # ]: 0 : cached_cmpctblock_msg = NetMsg::Make(NetMsgType::CMPCTBLOCK, *m_most_recent_compact_block);
5633 : : }
5634 : 0 : }
5635 [ # # ]: 0 : if (cached_cmpctblock_msg.has_value()) {
5636 [ # # ]: 0 : PushMessage(*pto, std::move(cached_cmpctblock_msg.value()));
5637 : : } else {
5638 : 0 : CBlock block;
5639 [ # # ]: 0 : const bool ret{m_chainman.m_blockman.ReadBlock(block, *pBestIndex)};
5640 [ # # ]: 0 : assert(ret);
5641 [ # # ]: 0 : CBlockHeaderAndShortTxIDs cmpctblock{block, m_rng.rand64()};
5642 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::CMPCTBLOCK, cmpctblock);
5643 : 0 : }
5644 [ # # ]: 0 : state.pindexBestHeaderSent = pBestIndex;
5645 [ # # ]: 0 : } else if (peer->m_prefers_headers) {
5646 [ # # ]: 0 : if (vHeaders.size() > 1) {
5647 [ # # # # : 0 : LogDebug(BCLog::NET, "%s: %u headers, range (%s, %s), to peer=%d\n", __func__,
# # # # #
# # # #
# ]
5648 : : vHeaders.size(),
5649 : : vHeaders.front().GetHash().ToString(),
5650 : : vHeaders.back().GetHash().ToString(), pto->GetId());
5651 : : } else {
5652 [ # # # # : 0 : LogDebug(BCLog::NET, "%s: sending header %s to peer=%d\n", __func__,
# # # # #
# ]
5653 : : vHeaders.front().GetHash().ToString(), pto->GetId());
5654 : : }
5655 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::HEADERS, TX_WITH_WITNESS(vHeaders));
5656 : 0 : state.pindexBestHeaderSent = pBestIndex;
5657 : : } else
5658 : : fRevertToInv = true;
5659 : : }
5660 [ + + ]: 25131 : if (fRevertToInv) {
5661 : : // If falling back to using an inv, just try to inv the tip.
5662 : : // The last entry in m_blocks_for_headers_relay was our tip at some point
5663 : : // in the past.
5664 [ - + ]: 25118 : if (!peer->m_blocks_for_headers_relay.empty()) {
5665 [ # # ]: 0 : const uint256& hashToAnnounce = peer->m_blocks_for_headers_relay.back();
5666 [ # # ]: 0 : const CBlockIndex* pindex = m_chainman.m_blockman.LookupBlockIndex(hashToAnnounce);
5667 [ # # ]: 0 : assert(pindex);
5668 : :
5669 : : // Warn if we're announcing a block that is not on the main chain.
5670 : : // This should be very rare and could be optimized out.
5671 : : // Just log for now.
5672 [ # # # # : 0 : if (m_chainman.ActiveChain()[pindex->nHeight] != pindex) {
# # ]
5673 [ # # # # : 0 : LogDebug(BCLog::NET, "Announcing block %s not on main chain (tip=%s)\n",
# # # # #
# # # #
# ]
5674 : : hashToAnnounce.ToString(), m_chainman.ActiveChain().Tip()->GetBlockHash().ToString());
5675 : : }
5676 : :
5677 : : // If the peer's chain has this block, don't inv it back.
5678 [ # # # # ]: 0 : if (!PeerHasHeader(&state, pindex)) {
5679 [ # # ]: 0 : peer->m_blocks_for_inv_relay.push_back(hashToAnnounce);
5680 [ # # # # : 0 : LogDebug(BCLog::NET, "%s: sending inv peer=%d hash=%s\n", __func__,
# # # # ]
5681 : : pto->GetId(), hashToAnnounce.ToString());
5682 : : }
5683 : : }
5684 : : }
5685 [ - + ]: 25131 : peer->m_blocks_for_headers_relay.clear();
5686 [ + - ]: 25131 : }
5687 : :
5688 : : //
5689 : : // Message: inventory
5690 : : //
5691 : 25131 : std::vector<CInv> vInv;
5692 : 25131 : {
5693 [ + - ]: 25131 : LOCK(peer->m_block_inv_mutex);
5694 [ - + - + : 25131 : vInv.reserve(std::max<size_t>(peer->m_blocks_for_inv_relay.size(), INVENTORY_BROADCAST_TARGET));
+ - ]
5695 : :
5696 : : // Add blocks
5697 [ - + ]: 25131 : for (const uint256& hash : peer->m_blocks_for_inv_relay) {
5698 [ # # ]: 0 : vInv.emplace_back(MSG_BLOCK, hash);
5699 [ # # # # ]: 0 : if (vInv.size() == MAX_INV_SZ) {
5700 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::INV, vInv);
5701 [ # # ]: 0 : vInv.clear();
5702 : : }
5703 : : }
5704 [ - + + - ]: 25131 : peer->m_blocks_for_inv_relay.clear();
5705 : 0 : }
5706 : :
5707 [ + - + + ]: 25131 : if (auto tx_relay = peer->GetTxRelay(); tx_relay != nullptr) {
5708 [ + - ]: 20093 : LOCK(tx_relay->m_tx_inventory_mutex);
5709 : : // Check whether periodic sends should happen
5710 [ + + ]: 20093 : bool fSendTrickle = pto->HasPermission(NetPermissionFlags::NoBan);
5711 [ + + ]: 20093 : if (tx_relay->m_next_inv_send_time < current_time) {
5712 : 4493 : fSendTrickle = true;
5713 [ + + ]: 4493 : if (pto->IsInboundConn()) {
5714 : 2421 : tx_relay->m_next_inv_send_time = NextInvToInbounds(current_time, INBOUND_INVENTORY_BROADCAST_INTERVAL);
5715 : : } else {
5716 : 2072 : tx_relay->m_next_inv_send_time = current_time + m_rng.rand_exp_duration(OUTBOUND_INVENTORY_BROADCAST_INTERVAL);
5717 : : }
5718 : : }
5719 : :
5720 : : // Time to send but the peer has requested we not relay transactions.
5721 [ - + ]: 20093 : if (fSendTrickle) {
5722 [ + - ]: 4493 : LOCK(tx_relay->m_bloom_filter_mutex);
5723 [ + + ]: 4493 : if (!tx_relay->m_relay_txs) tx_relay->m_tx_inventory_to_send.clear();
5724 : 4493 : }
5725 : :
5726 : : // Respond to BIP35 mempool requests
5727 [ + - - + ]: 4493 : if (fSendTrickle && tx_relay->m_send_mempool) {
5728 [ # # ]: 0 : auto vtxinfo = m_mempool.infoAll();
5729 : 0 : tx_relay->m_send_mempool = false;
5730 [ # # ]: 0 : const CFeeRate filterrate{tx_relay->m_fee_filter_received.load()};
5731 : :
5732 [ # # ]: 0 : LOCK(tx_relay->m_bloom_filter_mutex);
5733 : :
5734 [ # # ]: 0 : for (const auto& txinfo : vtxinfo) {
5735 [ # # ]: 0 : const Txid& txid{txinfo.tx->GetHash()};
5736 [ # # ]: 0 : const Wtxid& wtxid{txinfo.tx->GetWitnessHash()};
5737 [ # # ]: 0 : const auto inv = peer->m_wtxid_relay ?
5738 : : CInv{MSG_WTX, wtxid.ToUint256()} :
5739 [ # # # # ]: 0 : CInv{MSG_TX, txid.ToUint256()};
5740 : 0 : tx_relay->m_tx_inventory_to_send.erase(wtxid);
5741 : :
5742 : : // Don't send transactions that peers will not put into their mempool
5743 [ # # # # ]: 0 : if (txinfo.fee < filterrate.GetFee(txinfo.vsize)) {
5744 : 0 : continue;
5745 : : }
5746 [ # # ]: 0 : if (tx_relay->m_bloom_filter) {
5747 [ # # # # ]: 0 : if (!tx_relay->m_bloom_filter->IsRelevantAndUpdate(*txinfo.tx)) continue;
5748 : : }
5749 [ # # ]: 0 : tx_relay->m_tx_inventory_known_filter.insert(inv.hash);
5750 [ # # ]: 0 : vInv.push_back(inv);
5751 [ # # # # ]: 0 : if (vInv.size() == MAX_INV_SZ) {
5752 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::INV, vInv);
5753 [ # # ]: 0 : vInv.clear();
5754 : : }
5755 : : }
5756 : 0 : }
5757 : :
5758 : : // Determine transactions to relay
5759 : 4493 : if (fSendTrickle) {
5760 : : // Produce a vector with all candidates for sending
5761 : 4493 : std::vector<std::set<Wtxid>::iterator> vInvTx;
5762 [ + - ]: 4493 : vInvTx.reserve(tx_relay->m_tx_inventory_to_send.size());
5763 [ - + ]: 4493 : for (std::set<Wtxid>::iterator it = tx_relay->m_tx_inventory_to_send.begin(); it != tx_relay->m_tx_inventory_to_send.end(); it++) {
5764 [ # # ]: 0 : vInvTx.push_back(it);
5765 : : }
5766 [ + - ]: 4493 : const CFeeRate filterrate{tx_relay->m_fee_filter_received.load()};
5767 : : // Topologically and fee-rate sort the inventory we send for privacy and priority reasons.
5768 : : // A heap is used so that not all items need sorting if only a few are being sent.
5769 : 4493 : CompareInvMempoolOrder compareInvMempoolOrder(&m_mempool);
5770 [ + - ]: 4493 : std::make_heap(vInvTx.begin(), vInvTx.end(), compareInvMempoolOrder);
5771 : : // No reason to drain out at many times the network's capacity,
5772 : : // especially since we have many peers and some will draw much shorter delays.
5773 : 4493 : unsigned int nRelayedTransactions = 0;
5774 [ + - ]: 4493 : LOCK(tx_relay->m_bloom_filter_mutex);
5775 [ - + ]: 4493 : size_t broadcast_max{INVENTORY_BROADCAST_TARGET + (tx_relay->m_tx_inventory_to_send.size()/1000)*5};
5776 [ - + ]: 4493 : broadcast_max = std::min<size_t>(INVENTORY_BROADCAST_MAX, broadcast_max);
5777 [ - + - - ]: 4493 : while (!vInvTx.empty() && nRelayedTransactions < broadcast_max) {
5778 : : // Fetch the top element from the heap
5779 [ # # ]: 0 : std::pop_heap(vInvTx.begin(), vInvTx.end(), compareInvMempoolOrder);
5780 : 0 : std::set<Wtxid>::iterator it = vInvTx.back();
5781 : 0 : vInvTx.pop_back();
5782 : 0 : auto wtxid = *it;
5783 : : // Remove it from the to-be-sent set
5784 : 0 : tx_relay->m_tx_inventory_to_send.erase(it);
5785 : : // Not in the mempool anymore? don't bother sending it.
5786 [ # # ]: 0 : auto txinfo = m_mempool.info(wtxid);
5787 [ # # ]: 0 : if (!txinfo.tx) {
5788 : 0 : continue;
5789 : : }
5790 : : // `TxRelay::m_tx_inventory_known_filter` contains either txids or wtxids
5791 : : // depending on whether our peer supports wtxid-relay. Therefore, first
5792 : : // construct the inv and then use its hash for the filter check.
5793 [ # # ]: 0 : const auto inv = peer->m_wtxid_relay ?
5794 : : CInv{MSG_WTX, wtxid.ToUint256()} :
5795 [ # # # # ]: 0 : CInv{MSG_TX, txinfo.tx->GetHash().ToUint256()};
5796 : : // Check if not in the filter already
5797 [ # # # # ]: 0 : if (tx_relay->m_tx_inventory_known_filter.contains(inv.hash)) {
5798 : 0 : continue;
5799 : : }
5800 : : // Peer told you to not send transactions at that feerate? Don't bother sending it.
5801 [ # # # # ]: 0 : if (txinfo.fee < filterrate.GetFee(txinfo.vsize)) {
5802 : 0 : continue;
5803 : : }
5804 [ # # # # : 0 : if (tx_relay->m_bloom_filter && !tx_relay->m_bloom_filter->IsRelevantAndUpdate(*txinfo.tx)) continue;
# # ]
5805 : : // Send
5806 [ # # ]: 0 : vInv.push_back(inv);
5807 : 0 : nRelayedTransactions++;
5808 [ # # # # ]: 0 : if (vInv.size() == MAX_INV_SZ) {
5809 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::INV, vInv);
5810 [ # # ]: 0 : vInv.clear();
5811 : : }
5812 [ # # ]: 0 : tx_relay->m_tx_inventory_known_filter.insert(inv.hash);
5813 : 0 : }
5814 : :
5815 : : // Ensure we'll respond to GETDATA requests for anything we've just announced
5816 [ + - ]: 4493 : LOCK(m_mempool.cs);
5817 [ + - ]: 4493 : tx_relay->m_last_inv_sequence = m_mempool.GetSequence();
5818 [ + - ]: 8986 : }
5819 : 20093 : }
5820 [ - + ]: 25131 : if (!vInv.empty())
5821 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::INV, vInv);
5822 : :
5823 : : // Detect whether we're stalling
5824 [ - + ]: 25131 : auto stalling_timeout = m_block_stalling_timeout.load();
5825 [ - + - - ]: 25131 : if (state.m_stalling_since.count() && state.m_stalling_since < current_time - stalling_timeout) {
5826 : : // Stalling only triggers when the block download window cannot move. During normal steady state,
5827 : : // the download window should be much larger than the to-be-downloaded set of blocks, so disconnection
5828 : : // should only happen during initial block download.
5829 [ # # # # ]: 0 : LogInfo("Peer is stalling block download, %s\n", pto->DisconnectMsg(fLogIPs));
5830 [ # # ]: 0 : pto->fDisconnect = true;
5831 : : // Increase timeout for the next peer so that we don't disconnect multiple peers if our own
5832 : : // bandwidth is insufficient.
5833 [ # # ]: 0 : const auto new_timeout = std::min(2 * stalling_timeout, BLOCK_STALLING_TIMEOUT_MAX);
5834 [ # # # # ]: 0 : if (stalling_timeout != new_timeout && m_block_stalling_timeout.compare_exchange_strong(stalling_timeout, new_timeout)) {
5835 [ # # # # : 0 : LogDebug(BCLog::NET, "Increased stalling timeout temporarily to %d seconds\n", count_seconds(new_timeout));
# # ]
5836 : : }
5837 : 0 : return true;
5838 : : }
5839 : : // In case there is a block that has been in flight from this peer for block_interval * (1 + 0.5 * N)
5840 : : // (with N the number of peers from which we're downloading validated blocks), disconnect due to timeout.
5841 : : // We compensate for other peers to prevent killing off peers due to our own downstream link
5842 : : // being saturated. We only count validated in-flight blocks so peers can't advertise non-existing block hashes
5843 : : // to unreasonably increase our timeout.
5844 [ - + ]: 25131 : if (state.vBlocksInFlight.size() > 0) {
5845 : 0 : QueuedBlock &queuedBlock = state.vBlocksInFlight.front();
5846 : 0 : int nOtherPeersWithValidatedDownloads = m_peers_downloading_from - 1;
5847 [ # # ]: 0 : if (current_time > state.m_downloading_since + std::chrono::seconds{consensusParams.nPowTargetSpacing} * (BLOCK_DOWNLOAD_TIMEOUT_BASE + BLOCK_DOWNLOAD_TIMEOUT_PER_PEER * nOtherPeersWithValidatedDownloads)) {
5848 [ # # # # : 0 : LogInfo("Timeout downloading block %s, %s\n", queuedBlock.pindex->GetBlockHash().ToString(), pto->DisconnectMsg(fLogIPs));
# # ]
5849 : 0 : pto->fDisconnect = true;
5850 : 0 : return true;
5851 : : }
5852 : : }
5853 : : // Check for headers sync timeouts
5854 [ + + + + ]: 25131 : if (state.fSyncStarted && peer->m_headers_sync_timeout < std::chrono::microseconds::max()) {
5855 : : // Detect whether this is a stalling initial-headers-sync peer
5856 [ + + ]: 3242 : if (m_chainman.m_best_header->Time() <= NodeClock::now() - 24h) {
5857 [ - + - - : 1859 : if (current_time > peer->m_headers_sync_timeout && nSyncStarted == 1 && (m_num_preferred_download_peers - state.fPreferredDownload >= 1)) {
- - ]
5858 : : // Disconnect a peer (without NetPermissionFlags::NoBan permission) if it is our only sync peer,
5859 : : // and we have others we could be using instead.
5860 : : // Note: If all our peers are inbound, then we won't
5861 : : // disconnect our sync peer for stalling; we have bigger
5862 : : // problems if we can't get any outbound peers.
5863 [ # # ]: 0 : if (!pto->HasPermission(NetPermissionFlags::NoBan)) {
5864 [ # # # # ]: 0 : LogInfo("Timeout downloading headers, %s\n", pto->DisconnectMsg(fLogIPs));
5865 : 0 : pto->fDisconnect = true;
5866 : 0 : return true;
5867 : : } else {
5868 [ # # # # ]: 0 : LogInfo("Timeout downloading headers from noban peer, not %s\n", pto->DisconnectMsg(fLogIPs));
5869 : : // Reset the headers sync state so that we have a
5870 : : // chance to try downloading from a different peer.
5871 : : // Note: this will also result in at least one more
5872 : : // getheaders message to be sent to
5873 : : // this peer (eventually).
5874 : 0 : state.fSyncStarted = false;
5875 : 0 : nSyncStarted--;
5876 : 0 : peer->m_headers_sync_timeout = 0us;
5877 : : }
5878 : : }
5879 : : } else {
5880 : : // After we've caught up once, reset the timeout so we can't trigger
5881 : : // disconnect later.
5882 : 1383 : peer->m_headers_sync_timeout = std::chrono::microseconds::max();
5883 : : }
5884 : : }
5885 : :
5886 : : // Check that outbound peers have reasonable chains
5887 : : // GetTime() is used by this anti-DoS logic so we can test this using mocktime
5888 [ + - ]: 25131 : ConsiderEviction(*pto, *peer, GetTime<std::chrono::seconds>());
5889 : :
5890 : : //
5891 : : // Message: getdata (blocks)
5892 : : //
5893 : 25131 : std::vector<CInv> vGetData;
5894 [ + + + + : 25131 : if (CanServeBlocks(*peer) && ((sync_blocks_and_headers_from_peer && !IsLimitedPeer(*peer)) || !m_chainman.IsInitialBlockDownload()) && state.vBlocksInFlight.size() < MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
+ + + - -
+ + - ]
5895 : 22406 : std::vector<const CBlockIndex*> vToDownload;
5896 : 22406 : NodeId staller = -1;
5897 : 22406 : auto get_inflight_budget = [&state]() {
5898 : 44812 : return std::max(0, MAX_BLOCKS_IN_TRANSIT_PER_PEER - static_cast<int>(state.vBlocksInFlight.size()));
5899 : 22406 : };
5900 : :
5901 : : // If a snapshot chainstate is in use, we want to find its next blocks
5902 : : // before the background chainstate to prioritize getting to network tip.
5903 [ - + + - ]: 22406 : FindNextBlocksToDownload(*peer, get_inflight_budget(), vToDownload, staller);
5904 [ - + - - ]: 22406 : if (m_chainman.BackgroundSyncInProgress() && !IsLimitedPeer(*peer)) {
5905 : : // If the background tip is not an ancestor of the snapshot block,
5906 : : // we need to start requesting blocks from their last common ancestor.
5907 [ # # # # ]: 0 : const CBlockIndex *from_tip = LastCommonAncestor(m_chainman.GetBackgroundSyncTip(), m_chainman.GetSnapshotBaseBlock());
5908 [ # # ]: 0 : TryDownloadingHistoricalBlocks(
5909 [ # # ]: 0 : *peer,
5910 [ # # ]: 0 : get_inflight_budget(),
5911 : : vToDownload, from_tip,
5912 [ # # # # ]: 0 : Assert(m_chainman.GetSnapshotBaseBlock()));
5913 : : }
5914 [ - + ]: 22406 : for (const CBlockIndex *pindex : vToDownload) {
5915 : 0 : uint32_t nFetchFlags = GetFetchFlags(*peer);
5916 [ # # ]: 0 : vGetData.emplace_back(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash());
5917 [ # # ]: 0 : BlockRequested(pto->GetId(), *pindex);
5918 [ # # # # : 0 : LogDebug(BCLog::NET, "Requesting block %s (%d) peer=%d\n", pindex->GetBlockHash().ToString(),
# # # # ]
5919 : : pindex->nHeight, pto->GetId());
5920 : : }
5921 [ + - - + ]: 22406 : if (state.vBlocksInFlight.empty() && staller != -1) {
5922 [ # # ]: 0 : if (State(staller)->m_stalling_since == 0us) {
5923 : 0 : State(staller)->m_stalling_since = current_time;
5924 [ # # # # : 0 : LogDebug(BCLog::NET, "Stall started peer=%d\n", staller);
# # ]
5925 : : }
5926 : : }
5927 : 22406 : }
5928 : :
5929 : : //
5930 : : // Message: getdata (transactions)
5931 : : //
5932 : 25131 : {
5933 [ + - ]: 25131 : LOCK(m_tx_download_mutex);
5934 [ + - - + ]: 25131 : for (const GenTxid& gtxid : m_txdownloadman.GetRequestsToSend(pto->GetId(), current_time)) {
5935 [ # # # # : 0 : vGetData.emplace_back(gtxid.IsWtxid() ? MSG_WTX : (MSG_TX | GetFetchFlags(*peer)), gtxid.ToUint256());
# # # ]
5936 [ # # # # ]: 0 : if (vGetData.size() >= MAX_GETDATA_SZ) {
5937 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::GETDATA, vGetData);
5938 [ # # ]: 0 : vGetData.clear();
5939 : : }
5940 [ + - ]: 25131 : }
5941 : 0 : }
5942 : :
5943 [ - + ]: 25131 : if (!vGetData.empty())
5944 [ # # # # ]: 0 : MakeAndPushMessage(*pto, NetMsgType::GETDATA, vGetData);
5945 [ + - - - ]: 25131 : } // release cs_main
5946 [ + - ]: 25131 : MaybeSendFeefilter(*pto, *peer, current_time);
5947 : : return true;
5948 : 630755 : }
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