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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 <bitcoin-build-config.h> // IWYU pragma: keep
7 : :
8 : : #include <net.h>
9 : :
10 : : #include <addrdb.h>
11 : : #include <addrman.h>
12 : : #include <banman.h>
13 : : #include <clientversion.h>
14 : : #include <common/args.h>
15 : : #include <common/netif.h>
16 : : #include <compat/compat.h>
17 : : #include <consensus/consensus.h>
18 : : #include <crypto/sha256.h>
19 : : #include <i2p.h>
20 : : #include <key.h>
21 : : #include <logging.h>
22 : : #include <memusage.h>
23 : : #include <net_permissions.h>
24 : : #include <netaddress.h>
25 : : #include <netbase.h>
26 : : #include <node/eviction.h>
27 : : #include <node/interface_ui.h>
28 : : #include <protocol.h>
29 : : #include <random.h>
30 : : #include <scheduler.h>
31 : : #include <util/fs.h>
32 : : #include <util/sock.h>
33 : : #include <util/strencodings.h>
34 : : #include <util/thread.h>
35 : : #include <util/threadinterrupt.h>
36 : : #include <util/trace.h>
37 : : #include <util/translation.h>
38 : : #include <util/vector.h>
39 : :
40 : : #include <algorithm>
41 : : #include <array>
42 : : #include <cmath>
43 : : #include <cstdint>
44 : : #include <cstring>
45 : : #include <functional>
46 : : #include <optional>
47 : : #include <string_view>
48 : : #include <unordered_map>
49 : :
50 : : TRACEPOINT_SEMAPHORE(net, closed_connection);
51 : : TRACEPOINT_SEMAPHORE(net, evicted_inbound_connection);
52 : : TRACEPOINT_SEMAPHORE(net, inbound_connection);
53 : : TRACEPOINT_SEMAPHORE(net, outbound_connection);
54 : : TRACEPOINT_SEMAPHORE(net, outbound_message);
55 : :
56 : : /** Maximum number of block-relay-only anchor connections */
57 : : static constexpr size_t MAX_BLOCK_RELAY_ONLY_ANCHORS = 2;
58 : : static_assert (MAX_BLOCK_RELAY_ONLY_ANCHORS <= static_cast<size_t>(MAX_BLOCK_RELAY_ONLY_CONNECTIONS), "MAX_BLOCK_RELAY_ONLY_ANCHORS must not exceed MAX_BLOCK_RELAY_ONLY_CONNECTIONS.");
59 : : /** Anchor IP address database file name */
60 : : const char* const ANCHORS_DATABASE_FILENAME = "anchors.dat";
61 : :
62 : : // How often to dump addresses to peers.dat
63 : : static constexpr std::chrono::minutes DUMP_PEERS_INTERVAL{15};
64 : :
65 : : /** Number of DNS seeds to query when the number of connections is low. */
66 : : static constexpr int DNSSEEDS_TO_QUERY_AT_ONCE = 3;
67 : :
68 : : /** Minimum number of outbound connections under which we will keep fetching our address seeds. */
69 : : static constexpr int SEED_OUTBOUND_CONNECTION_THRESHOLD = 2;
70 : :
71 : : /** How long to delay before querying DNS seeds
72 : : *
73 : : * If we have more than THRESHOLD entries in addrman, then it's likely
74 : : * that we got those addresses from having previously connected to the P2P
75 : : * network, and that we'll be able to successfully reconnect to the P2P
76 : : * network via contacting one of them. So if that's the case, spend a
77 : : * little longer trying to connect to known peers before querying the
78 : : * DNS seeds.
79 : : */
80 : : static constexpr std::chrono::seconds DNSSEEDS_DELAY_FEW_PEERS{11};
81 : : static constexpr std::chrono::minutes DNSSEEDS_DELAY_MANY_PEERS{5};
82 : : static constexpr int DNSSEEDS_DELAY_PEER_THRESHOLD = 1000; // "many" vs "few" peers
83 : :
84 : : /** The default timeframe for -maxuploadtarget. 1 day. */
85 : : static constexpr std::chrono::seconds MAX_UPLOAD_TIMEFRAME{60 * 60 * 24};
86 : :
87 : : // A random time period (0 to 1 seconds) is added to feeler connections to prevent synchronization.
88 : : static constexpr auto FEELER_SLEEP_WINDOW{1s};
89 : :
90 : : /** Frequency to attempt extra connections to reachable networks we're not connected to yet **/
91 : : static constexpr auto EXTRA_NETWORK_PEER_INTERVAL{5min};
92 : :
93 : : /** Used to pass flags to the Bind() function */
94 : : enum BindFlags {
95 : : BF_NONE = 0,
96 : : BF_REPORT_ERROR = (1U << 0),
97 : : /**
98 : : * Do not call AddLocal() for our special addresses, e.g., for incoming
99 : : * Tor connections, to prevent gossiping them over the network.
100 : : */
101 : : BF_DONT_ADVERTISE = (1U << 1),
102 : : };
103 : :
104 : : // The set of sockets cannot be modified while waiting
105 : : // The sleep time needs to be small to avoid new sockets stalling
106 : : static const uint64_t SELECT_TIMEOUT_MILLISECONDS = 50;
107 : :
108 : : const std::string NET_MESSAGE_TYPE_OTHER = "*other*";
109 : :
110 : : static const uint64_t RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL; // SHA256("netgroup")[0:8]
111 : : static const uint64_t RANDOMIZER_ID_LOCALHOSTNONCE = 0xd93e69e2bbfa5735ULL; // SHA256("localhostnonce")[0:8]
112 : : static const uint64_t RANDOMIZER_ID_NETWORKKEY = 0x0e8a2b136c592a7dULL; // SHA256("networkkey")[0:8]
113 : : //
114 : : // Global state variables
115 : : //
116 : : bool fDiscover = true;
117 : : bool fListen = true;
118 : : GlobalMutex g_maplocalhost_mutex;
119 : : std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(g_maplocalhost_mutex);
120 : : std::string strSubVersion;
121 : :
122 : 660752 : size_t CSerializedNetMsg::GetMemoryUsage() const noexcept
123 : : {
124 [ - + ]: 660752 : return sizeof(*this) + memusage::DynamicUsage(m_type) + memusage::DynamicUsage(data);
125 : : }
126 : :
127 : 325761 : size_t CNetMessage::GetMemoryUsage() const noexcept
128 : : {
129 : 325761 : return sizeof(*this) + memusage::DynamicUsage(m_type) + m_recv.GetMemoryUsage();
130 : : }
131 : :
132 : 12 : void CConnman::AddAddrFetch(const std::string& strDest)
133 : : {
134 : 12 : LOCK(m_addr_fetches_mutex);
135 [ + - ]: 12 : m_addr_fetches.push_back(strDest);
136 : 12 : }
137 : :
138 : 1702 : uint16_t GetListenPort()
139 : : {
140 : : // If -bind= is provided with ":port" part, use that (first one if multiple are provided).
141 [ + - + + ]: 3438 : for (const std::string& bind_arg : gArgs.GetArgs("-bind")) {
142 : 1739 : constexpr uint16_t dummy_port = 0;
143 : :
144 [ + - + - ]: 1739 : const std::optional<CService> bind_addr{Lookup(bind_arg, dummy_port, /*fAllowLookup=*/false)};
145 [ + + + - : 1739 : if (bind_addr.has_value() && bind_addr->GetPort() != dummy_port) return bind_addr->GetPort();
+ + + - ]
146 : 3438 : }
147 : :
148 : : // Otherwise, if -whitebind= without NetPermissionFlags::NoBan is provided, use that
149 : : // (-whitebind= is required to have ":port").
150 [ + - + + ]: 1699 : for (const std::string& whitebind_arg : gArgs.GetArgs("-whitebind")) {
151 [ + - ]: 1 : NetWhitebindPermissions whitebind;
152 [ + - ]: 1 : bilingual_str error;
153 [ + - + - ]: 1 : if (NetWhitebindPermissions::TryParse(whitebind_arg, whitebind, error)) {
154 [ + - ]: 1 : if (!NetPermissions::HasFlag(whitebind.m_flags, NetPermissionFlags::NoBan)) {
155 [ + - ]: 1 : return whitebind.m_service.GetPort();
156 : : }
157 : : }
158 : 1 : }
159 : :
160 : : // Otherwise, if -port= is provided, use that. Otherwise use the default port.
161 : 3396 : return static_cast<uint16_t>(gArgs.GetIntArg("-port", Params().GetDefaultPort()));
162 : : }
163 : :
164 : : // Determine the "best" local address for a particular peer.
165 : 1693 : [[nodiscard]] static std::optional<CService> GetLocal(const CNode& peer)
166 : : {
167 [ - + ]: 1693 : if (!fListen) return std::nullopt;
168 : :
169 : 1693 : std::optional<CService> addr;
170 : 1693 : int nBestScore = -1;
171 : 1693 : int nBestReachability = -1;
172 : 1693 : {
173 [ + - ]: 1693 : LOCK(g_maplocalhost_mutex);
174 [ + - + + ]: 1788 : for (const auto& [local_addr, local_service_info] : mapLocalHost) {
175 : : // For privacy reasons, don't advertise our privacy-network address
176 : : // to other networks and don't advertise our other-network address
177 : : // to privacy networks.
178 [ + - + - ]: 95 : if (local_addr.GetNetwork() != peer.ConnectedThroughNetwork()
179 [ + + + - : 152 : && (local_addr.IsPrivacyNet() || peer.IsConnectedThroughPrivacyNet())) {
+ + ]
180 : 36 : continue;
181 : : }
182 : 59 : const int nScore{local_service_info.nScore};
183 [ + - ]: 59 : const int nReachability{local_addr.GetReachabilityFrom(peer.addr)};
184 [ + + - + ]: 59 : if (nReachability > nBestReachability || (nReachability == nBestReachability && nScore > nBestScore)) {
185 [ + - ]: 42 : addr.emplace(CService{local_addr, local_service_info.nPort});
186 : 42 : nBestReachability = nReachability;
187 : 42 : nBestScore = nScore;
188 : : }
189 : : }
190 : 0 : }
191 [ + + ]: 1732 : return addr;
192 : 1693 : }
193 : :
194 : : //! Convert the serialized seeds into usable address objects.
195 : 3 : static std::vector<CAddress> ConvertSeeds(const std::vector<uint8_t> &vSeedsIn)
196 : : {
197 : : // It'll only connect to one or two seed nodes because once it connects,
198 : : // it'll get a pile of addresses with newer timestamps.
199 : : // Seed nodes are given a random 'last seen time' of between one and two
200 : : // weeks ago.
201 : 3 : const auto one_week{7 * 24h};
202 : 3 : std::vector<CAddress> vSeedsOut;
203 : 3 : FastRandomContext rng;
204 [ - + ]: 3 : ParamsStream s{SpanReader{vSeedsIn}, CAddress::V2_NETWORK};
205 [ - + ]: 3 : while (!s.empty()) {
206 [ # # ]: 0 : CService endpoint;
207 [ # # ]: 0 : s >> endpoint;
208 : 0 : CAddress addr{endpoint, SeedsServiceFlags()};
209 : 0 : addr.nTime = rng.rand_uniform_delay(Now<NodeSeconds>() - one_week, -one_week);
210 [ # # # # : 0 : LogDebug(BCLog::NET, "Added hardcoded seed: %s\n", addr.ToStringAddrPort());
# # # # ]
211 [ # # ]: 0 : vSeedsOut.push_back(addr);
212 : 0 : }
213 : 3 : return vSeedsOut;
214 : 3 : }
215 : :
216 : : // Determine the "best" local address for a particular peer.
217 : : // If none, return the unroutable 0.0.0.0 but filled in with
218 : : // the normal parameters, since the IP may be changed to a useful
219 : : // one by discovery.
220 : 1693 : CService GetLocalAddress(const CNode& peer)
221 : : {
222 [ + - + - : 1693 : return GetLocal(peer).value_or(CService{CNetAddr(), GetListenPort()});
+ - ]
223 : : }
224 : :
225 : 0 : static int GetnScore(const CService& addr)
226 : : {
227 : 0 : LOCK(g_maplocalhost_mutex);
228 [ # # ]: 0 : const auto it = mapLocalHost.find(addr);
229 [ # # ]: 0 : return (it != mapLocalHost.end()) ? it->second.nScore : 0;
230 : 0 : }
231 : :
232 : : // Is our peer's addrLocal potentially useful as an external IP source?
233 : 1672 : [[nodiscard]] static bool IsPeerAddrLocalGood(CNode *pnode)
234 : : {
235 : 1672 : CService addrLocal = pnode->GetAddrLocal();
236 [ + + + - : 1676 : return fDiscover && pnode->addr.IsRoutable() && addrLocal.IsRoutable() &&
+ - + - +
- - + ]
237 [ + - ]: 1676 : g_reachable_nets.Contains(addrLocal);
238 : 1672 : }
239 : :
240 : 1672 : std::optional<CService> GetLocalAddrForPeer(CNode& node)
241 : : {
242 : 1672 : CService addrLocal{GetLocalAddress(node)};
243 : : // If discovery is enabled, sometimes give our peer the address it
244 : : // tells us that it sees us as in case it has a better idea of our
245 : : // address than we do.
246 : 1672 : FastRandomContext rng;
247 [ + - + + : 1672 : if (IsPeerAddrLocalGood(&node) && (!addrLocal.IsRoutable() ||
+ - - + -
- ]
248 [ # # # # ]: 0 : rng.randbits((GetnScore(addrLocal) > LOCAL_MANUAL) ? 3 : 1) == 0))
249 : : {
250 [ + + ]: 4 : if (node.IsInboundConn()) {
251 : : // For inbound connections, assume both the address and the port
252 : : // as seen from the peer.
253 [ + - ]: 2 : addrLocal = CService{node.GetAddrLocal()};
254 : : } else {
255 : : // For outbound connections, assume just the address as seen from
256 : : // the peer and leave the port in `addrLocal` as returned by
257 : : // `GetLocalAddress()` above. The peer has no way to observe our
258 : : // listening port when we have initiated the connection.
259 [ + - + - ]: 6 : addrLocal.SetIP(node.GetAddrLocal());
260 : : }
261 : : }
262 [ + - + + ]: 1672 : if (addrLocal.IsRoutable()) {
263 [ + - + - : 56 : LogDebug(BCLog::NET, "Advertising address %s to peer=%d\n", addrLocal.ToStringAddrPort(), node.GetId());
+ - + - ]
264 : 28 : return addrLocal;
265 : : }
266 : : // Address is unroutable. Don't advertise.
267 : 1644 : return std::nullopt;
268 : 1672 : }
269 : :
270 : 651 : void ClearLocal()
271 : : {
272 : 651 : LOCK(g_maplocalhost_mutex);
273 [ + - ]: 651 : return mapLocalHost.clear();
274 : 651 : }
275 : :
276 : : // learn a new local address
277 : 13 : bool AddLocal(const CService& addr_, int nScore)
278 : : {
279 : 13 : CService addr{MaybeFlipIPv6toCJDNS(addr_)};
280 : :
281 [ + - + + ]: 13 : if (!addr.IsRoutable())
282 : : return false;
283 : :
284 [ + + + - ]: 12 : if (!fDiscover && nScore < LOCAL_MANUAL)
285 : : return false;
286 : :
287 [ + - + - ]: 12 : if (!g_reachable_nets.Contains(addr))
288 : : return false;
289 : :
290 [ + - + - ]: 12 : LogInfo("AddLocal(%s,%i)\n", addr.ToStringAddrPort(), nScore);
291 : :
292 : 12 : {
293 [ + - ]: 12 : LOCK(g_maplocalhost_mutex);
294 [ + - - + ]: 12 : const auto [it, is_newly_added] = mapLocalHost.emplace(addr, LocalServiceInfo());
295 [ - + ]: 12 : LocalServiceInfo &info = it->second;
296 [ - + - - ]: 12 : if (is_newly_added || nScore >= info.nScore) {
297 [ - + ]: 12 : info.nScore = nScore + (is_newly_added ? 0 : 1);
298 [ + - ]: 12 : info.nPort = addr.GetPort();
299 : : }
300 : 0 : }
301 : :
302 : 12 : return true;
303 : 13 : }
304 : :
305 : 1 : bool AddLocal(const CNetAddr &addr, int nScore)
306 : : {
307 [ + - ]: 1 : return AddLocal(CService(addr, GetListenPort()), nScore);
308 : : }
309 : :
310 : 11 : void RemoveLocal(const CService& addr)
311 : : {
312 : 11 : LOCK(g_maplocalhost_mutex);
313 [ + - + - ]: 11 : LogInfo("RemoveLocal(%s)\n", addr.ToStringAddrPort());
314 [ + - + - ]: 11 : mapLocalHost.erase(addr);
315 : 11 : }
316 : :
317 : : /** vote for a local address */
318 : 0 : bool SeenLocal(const CService& addr)
319 : : {
320 : 0 : LOCK(g_maplocalhost_mutex);
321 [ # # ]: 0 : const auto it = mapLocalHost.find(addr);
322 [ # # ]: 0 : if (it == mapLocalHost.end()) return false;
323 : 0 : ++it->second.nScore;
324 : 0 : return true;
325 : 0 : }
326 : :
327 : :
328 : : /** check whether a given address is potentially local */
329 : 110 : bool IsLocal(const CService& addr)
330 : : {
331 : 110 : LOCK(g_maplocalhost_mutex);
332 [ + - + - ]: 110 : return mapLocalHost.contains(addr);
333 : 110 : }
334 : :
335 : 623 : bool CConnman::AlreadyConnectedToHost(std::string_view host) const
336 : : {
337 : 623 : LOCK(m_nodes_mutex);
338 [ + - - + ]: 1178 : return std::ranges::any_of(m_nodes, [&host](CNode* node) { return node->m_addr_name == host; });
339 : 623 : }
340 : :
341 : 651 : bool CConnman::AlreadyConnectedToAddressPort(const CService& addr_port) const
342 : : {
343 : 651 : LOCK(m_nodes_mutex);
344 [ + - + - ]: 1392 : return std::ranges::any_of(m_nodes, [&addr_port](CNode* node) { return node->addr == addr_port; });
345 : 651 : }
346 : :
347 : 43 : bool CConnman::AlreadyConnectedToAddress(const CNetAddr& addr) const
348 : : {
349 : 43 : LOCK(m_nodes_mutex);
350 [ + - + - ]: 263 : return std::ranges::any_of(m_nodes, [&addr](CNode* node) { return node->addr == addr; });
351 : 43 : }
352 : :
353 : 1035 : bool CConnman::CheckIncomingNonce(uint64_t nonce)
354 : : {
355 : 1035 : LOCK(m_nodes_mutex);
356 [ + + ]: 5957 : for (const CNode* pnode : m_nodes) {
357 : : // Omit private broadcast connections from this check to prevent this privacy attack:
358 : : // - We connect to a peer in an attempt to privately broadcast a transaction. From our
359 : : // VERSION message the peer deducts that this is a short-lived connection for
360 : : // broadcasting a transaction, takes our nonce and delays their VERACK.
361 : : // - The peer starts connecting to (clearnet) nodes and sends them a VERSION message
362 : : // which contains our nonce. If the peer manages to connect to us we would disconnect.
363 : : // - Upon a disconnect, the peer knows our clearnet address. They go back to the short
364 : : // lived privacy broadcast connection and continue with VERACK.
365 [ + + + + : 4924 : if (!pnode->fSuccessfullyConnected && !pnode->IsInboundConn() && !pnode->IsPrivateBroadcastConn() &&
+ - ]
366 [ - + ]: 2 : pnode->GetLocalNonce() == nonce)
367 : : return false;
368 : : }
369 : : return true;
370 : 1035 : }
371 : :
372 : 666 : CNode* CConnman::ConnectNode(CAddress addrConnect,
373 : : const char* pszDest,
374 : : bool fCountFailure,
375 : : ConnectionType conn_type,
376 : : bool use_v2transport,
377 : : const std::optional<Proxy>& proxy_override)
378 : : {
379 : 666 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
380 [ - + ]: 666 : assert(conn_type != ConnectionType::INBOUND);
381 : :
382 [ + + ]: 666 : if (pszDest == nullptr) {
383 [ + - ]: 33 : if (IsLocal(addrConnect))
384 : : return nullptr;
385 : :
386 : : // Look for an existing connection
387 [ - + ]: 33 : if (AlreadyConnectedToAddressPort(addrConnect)) {
388 [ # # ]: 0 : LogInfo("Failed to open new connection to %s, already connected", addrConnect.ToStringAddrPort());
389 : 0 : return nullptr;
390 : : }
391 : : }
392 : :
393 [ + - + + : 1902 : LogDebug(BCLog::NET, "trying %s connection (%s) to %s, lastseen=%.1fhrs\n",
+ + + - +
+ + - ]
394 : : use_v2transport ? "v2" : "v1",
395 : : ConnectionTypeAsString(conn_type),
396 : : pszDest ? pszDest : addrConnect.ToStringAddrPort(),
397 : : Ticks<HoursDouble>(pszDest ? 0h : Now<NodeSeconds>() - addrConnect.nTime));
398 : :
399 : : // Resolve
400 [ + + + - ]: 1299 : const uint16_t default_port{pszDest != nullptr ? GetDefaultPort(pszDest) :
401 : 33 : m_params.GetDefaultPort()};
402 : :
403 : : // Collection of addresses to try to connect to: either all dns resolved addresses if a domain name (pszDest) is provided, or addrConnect otherwise.
404 : 666 : std::vector<CAddress> connect_to{};
405 [ + + ]: 666 : if (pszDest) {
406 [ + - + - : 1316 : std::vector<CService> resolved{Lookup(pszDest, default_port, fNameLookup && !HaveNameProxy(), 256)};
+ - + + +
- + - ]
407 [ + + ]: 633 : if (!resolved.empty()) {
408 : 620 : std::shuffle(resolved.begin(), resolved.end(), FastRandomContext());
409 : : // If the connection is made by name, it can be the case that the name resolves to more than one address.
410 : : // We don't want to connect any more of them if we are already connected to one
411 [ + + ]: 1228 : for (const auto& r : resolved) {
412 [ + - ]: 1240 : addrConnect = CAddress{MaybeFlipIPv6toCJDNS(r), NODE_NONE};
413 [ + - + + ]: 620 : if (!addrConnect.IsValid()) {
414 [ + - + - : 4 : LogDebug(BCLog::NET, "Resolver returned invalid address %s for %s\n", addrConnect.ToStringAddrPort(), pszDest);
+ - + - ]
415 : 2 : return nullptr;
416 : : }
417 : : // It is possible that we already have a connection to the IP/port pszDest resolved to.
418 : : // In that case, drop the connection that was just created.
419 [ + - + + ]: 618 : if (AlreadyConnectedToAddressPort(addrConnect)) {
420 [ + - + - ]: 10 : LogInfo("Not opening a connection to %s, already connected to %s\n", pszDest, addrConnect.ToStringAddrPort());
421 : 10 : return nullptr;
422 : : }
423 : : // Add the address to the resolved addresses vector so we can try to connect to it later on
424 [ + - ]: 608 : connect_to.push_back(addrConnect);
425 : : }
426 : : } else {
427 : : // For resolution via proxy
428 [ + - ]: 13 : connect_to.push_back(addrConnect);
429 : : }
430 : 633 : } else {
431 : : // Connect via addrConnect directly
432 [ + - ]: 33 : connect_to.push_back(addrConnect);
433 : : }
434 : :
435 : : // Connect
436 : 654 : std::unique_ptr<Sock> sock;
437 [ + - ]: 654 : Proxy proxy;
438 [ + - ]: 654 : CService addr_bind;
439 [ + - - + ]: 654 : assert(!addr_bind.IsValid());
440 : 654 : std::unique_ptr<i2p::sam::Session> i2p_transient_session;
441 : :
442 [ + + ]: 684 : for (auto& target_addr: connect_to) {
443 [ + - + + ]: 654 : if (target_addr.IsValid()) {
444 : 641 : bool use_proxy;
445 [ + + ]: 641 : if (proxy_override.has_value()) {
446 : 8 : use_proxy = true;
447 [ + - ]: 8 : proxy = proxy_override.value();
448 : : } else {
449 [ + - + - ]: 633 : use_proxy = GetProxy(target_addr.GetNetwork(), proxy);
450 : : }
451 : 641 : bool proxyConnectionFailed = false;
452 : :
453 [ + + - + ]: 641 : if (target_addr.IsI2P() && use_proxy) {
454 [ + - ]: 13 : i2p::Connection conn;
455 : 13 : bool connected{false};
456 : :
457 : : // If an I2P SAM session already exists, normally we would re-use it. But in the case of
458 : : // private broadcast we force a new transient session. A Connect() using m_i2p_sam_session
459 : : // would use our permanent I2P address as a source address.
460 [ + + + + ]: 13 : if (m_i2p_sam_session && conn_type != ConnectionType::PRIVATE_BROADCAST) {
461 [ + - ]: 3 : connected = m_i2p_sam_session->Connect(target_addr, conn, proxyConnectionFailed);
462 : : } else {
463 : 10 : {
464 [ + - ]: 10 : LOCK(m_unused_i2p_sessions_mutex);
465 [ + + ]: 10 : if (m_unused_i2p_sessions.empty()) {
466 : 2 : i2p_transient_session =
467 [ + - ]: 4 : std::make_unique<i2p::sam::Session>(proxy, m_interrupt_net);
468 : : } else {
469 : 8 : i2p_transient_session.swap(m_unused_i2p_sessions.front());
470 : 8 : m_unused_i2p_sessions.pop();
471 : : }
472 : 0 : }
473 [ + - ]: 10 : connected = i2p_transient_session->Connect(target_addr, conn, proxyConnectionFailed);
474 [ + - ]: 10 : if (!connected) {
475 [ + - ]: 10 : LOCK(m_unused_i2p_sessions_mutex);
476 [ - + + - ]: 10 : if (m_unused_i2p_sessions.size() < MAX_UNUSED_I2P_SESSIONS_SIZE) {
477 [ + - + - ]: 10 : m_unused_i2p_sessions.emplace(i2p_transient_session.release());
478 : : }
479 : 10 : }
480 : : }
481 : :
482 [ - + ]: 13 : if (connected) {
483 : 0 : sock = std::move(conn.sock);
484 : 0 : addr_bind = conn.me;
485 : : }
486 [ + + ]: 641 : } else if (use_proxy) {
487 [ + - + - : 84 : LogDebug(BCLog::PROXY, "Using proxy: %s to connect to %s\n", proxy.ToString(), target_addr.ToStringAddrPort());
+ - + - +
- ]
488 [ + - + - : 84 : sock = ConnectThroughProxy(proxy, target_addr.ToStringAddr(), target_addr.GetPort(), proxyConnectionFailed);
+ - ]
489 : : } else {
490 : : // no proxy needed (none set for target network)
491 [ + - ]: 1172 : sock = ConnectDirectly(target_addr, conn_type == ConnectionType::MANUAL);
492 : : }
493 [ + + ]: 641 : if (!proxyConnectionFailed) {
494 : : // If a connection to the node was attempted, and failure (if any) is not caused by a problem connecting to
495 : : // the proxy, mark this as an attempt.
496 [ + - ]: 621 : addrman.get().Attempt(target_addr, fCountFailure);
497 : : }
498 [ + - + - : 13 : } else if (pszDest && GetNameProxy(proxy)) {
+ - ]
499 [ + - ]: 13 : std::string host;
500 : 13 : uint16_t port{default_port};
501 [ + - + - ]: 26 : SplitHostPort(std::string(pszDest), port, host);
502 : 13 : bool proxyConnectionFailed;
503 [ + - ]: 26 : sock = ConnectThroughProxy(proxy, host, port, proxyConnectionFailed);
504 : 13 : }
505 : : // Check any other resolved address (if any) if we fail to connect
506 [ + + ]: 654 : if (!sock) {
507 : 30 : continue;
508 : : }
509 : :
510 : 624 : NetPermissionFlags permission_flags = NetPermissionFlags::None;
511 [ + + + - ]: 624 : std::vector<NetWhitelistPermissions> whitelist_permissions = conn_type == ConnectionType::MANUAL ? vWhitelistedRangeOutgoing : std::vector<NetWhitelistPermissions>{};
512 [ + - ]: 624 : AddWhitelistPermissionFlags(permission_flags, target_addr, whitelist_permissions);
513 : :
514 : : // Add node
515 [ + - ]: 624 : NodeId id = GetNewNodeId();
516 [ + - + - : 624 : uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
+ - ]
517 [ + - + - ]: 624 : if (!addr_bind.IsValid()) {
518 [ + - ]: 1248 : addr_bind = GetBindAddress(*sock);
519 : : }
520 [ + - ]: 624 : uint64_t network_id = GetDeterministicRandomizer(RANDOMIZER_ID_NETWORKKEY)
521 [ + - + - ]: 624 : .Write(target_addr.GetNetClass())
522 [ + - + - ]: 1248 : .Write(addr_bind.GetAddrBytes())
523 : : // For outbound connections, the port of the bound address is randomly
524 : : // assigned by the OS and would therefore not be useful for seeding.
525 [ + - ]: 624 : .Write(0)
526 [ + - ]: 624 : .Finalize();
527 : 624 : CNode* pnode = new CNode(id,
528 : 624 : std::move(sock),
529 : : target_addr,
530 : : CalculateKeyedNetGroup(target_addr),
531 : : nonce,
532 : : addr_bind,
533 [ + - ]: 1248 : pszDest ? pszDest : "",
534 : : conn_type,
535 : : /*inbound_onion=*/false,
536 : : network_id,
537 [ + + ]: 624 : CNodeOptions{
538 : : .permission_flags = permission_flags,
539 : : .i2p_sam_session = std::move(i2p_transient_session),
540 [ + + ]: 624 : .recv_flood_size = nReceiveFloodSize,
541 : : .use_v2transport = use_v2transport,
542 [ + - + - : 1248 : });
+ - + - +
- ]
543 : 624 : pnode->AddRef();
544 : :
545 : : // We're making a new connection, harvest entropy from the time (and our peer count)
546 : 624 : RandAddEvent((uint32_t)id);
547 : :
548 : 624 : return pnode;
549 : 624 : }
550 : :
551 : : return nullptr;
552 : 1320 : }
553 : :
554 : 2265 : void CNode::CloseSocketDisconnect()
555 : : {
556 : 2265 : fDisconnect = true;
557 : 2265 : LOCK(m_sock_mutex);
558 [ + + ]: 2265 : if (m_sock) {
559 [ + - + - : 3352 : LogDebug(BCLog::NET, "Resetting socket for %s", LogPeer());
+ - + - ]
560 : 1676 : m_sock.reset();
561 : :
562 : : TRACEPOINT(net, closed_connection,
563 : : GetId(),
564 : : m_addr_name.c_str(),
565 : : ConnectionTypeAsString().c_str(),
566 : : ConnectedThroughNetwork(),
567 : 1676 : Ticks<std::chrono::seconds>(m_connected));
568 : : }
569 [ - + + - ]: 2265 : m_i2p_sam_session.reset();
570 : 2265 : }
571 : :
572 : 1679 : void CConnman::AddWhitelistPermissionFlags(NetPermissionFlags& flags, std::optional<CNetAddr> addr, const std::vector<NetWhitelistPermissions>& ranges) const {
573 [ + + ]: 1978 : for (const auto& subnet : ranges) {
574 [ + - + - ]: 299 : if (addr.has_value() && subnet.m_subnet.Match(addr.value())) {
575 : 299 : NetPermissions::AddFlag(flags, subnet.m_flags);
576 : : }
577 : : }
578 [ + + ]: 1679 : if (NetPermissions::HasFlag(flags, NetPermissionFlags::Implicit)) {
579 [ + + ]: 5 : NetPermissions::ClearFlag(flags, NetPermissionFlags::Implicit);
580 [ + + ]: 5 : if (whitelist_forcerelay) NetPermissions::AddFlag(flags, NetPermissionFlags::ForceRelay);
581 [ + + ]: 5 : if (whitelist_relay) NetPermissions::AddFlag(flags, NetPermissionFlags::Relay);
582 : 5 : NetPermissions::AddFlag(flags, NetPermissionFlags::Mempool);
583 : 5 : NetPermissions::AddFlag(flags, NetPermissionFlags::NoBan);
584 : : }
585 : 1679 : }
586 : :
587 : 14574 : CService CNode::GetAddrLocal() const
588 : : {
589 : 14574 : AssertLockNotHeld(m_addr_local_mutex);
590 : 14574 : LOCK(m_addr_local_mutex);
591 [ + - ]: 14574 : return m_addr_local;
592 : 14574 : }
593 : :
594 : 1613 : void CNode::SetAddrLocal(const CService& addrLocalIn) {
595 : 1613 : AssertLockNotHeld(m_addr_local_mutex);
596 : 1613 : LOCK(m_addr_local_mutex);
597 [ + - + - ]: 1613 : if (Assume(!m_addr_local.IsValid())) { // Addr local can only be set once during version msg processing
598 : 1613 : m_addr_local = addrLocalIn;
599 : : }
600 : 1613 : }
601 : :
602 : 13019 : Network CNode::ConnectedThroughNetwork() const
603 : : {
604 [ + + ]: 13019 : return m_inbound_onion ? NET_ONION : addr.GetNetClass();
605 : : }
606 : :
607 : 57 : bool CNode::IsConnectedThroughPrivacyNet() const
608 : : {
609 [ + - + + ]: 57 : return m_inbound_onion || addr.IsPrivacyNet();
610 : : }
611 : :
612 : : #undef X
613 : : #define X(name) stats.name = name
614 : 12898 : void CNode::CopyStats(CNodeStats& stats)
615 : : {
616 : 12898 : stats.nodeid = this->GetId();
617 : 12898 : X(addr);
618 : 12898 : X(addrBind);
619 : 12898 : stats.m_network = ConnectedThroughNetwork();
620 : 12898 : X(m_last_send);
621 : 12898 : X(m_last_recv);
622 : 12898 : X(m_last_tx_time);
623 : 12898 : X(m_last_block_time);
624 : 12898 : X(m_connected);
625 : 12898 : X(m_addr_name);
626 : 12898 : X(nVersion);
627 : 12898 : {
628 : 12898 : LOCK(m_subver_mutex);
629 [ + - + - ]: 25796 : X(cleanSubVer);
630 : 0 : }
631 : 12898 : stats.fInbound = IsInboundConn();
632 : 12898 : X(m_bip152_highbandwidth_to);
633 : 12898 : X(m_bip152_highbandwidth_from);
634 : 12898 : {
635 : 12898 : LOCK(cs_vSend);
636 [ + - ]: 12898 : X(mapSendBytesPerMsgType);
637 [ + - ]: 12898 : X(nSendBytes);
638 : 0 : }
639 : 12898 : {
640 : 12898 : LOCK(cs_vRecv);
641 [ + - ]: 12898 : X(mapRecvBytesPerMsgType);
642 : 12898 : X(nRecvBytes);
643 : 12898 : Transport::Info info = m_transport->GetInfo();
644 : 12898 : stats.m_transport_type = info.transport_type;
645 [ + + + - ]: 12898 : if (info.session_id) stats.m_session_id = HexStr(*info.session_id);
646 : 0 : }
647 : 12898 : X(m_permission_flags);
648 : :
649 : 12898 : X(m_last_ping_time);
650 : 12898 : X(m_min_ping_time);
651 : :
652 : : // Leave string empty if addrLocal invalid (not filled in yet)
653 : 12898 : CService addrLocalUnlocked = GetAddrLocal();
654 [ + - + + : 12898 : stats.addrLocal = addrLocalUnlocked.IsValid() ? addrLocalUnlocked.ToStringAddrPort() : "";
+ - + - ]
655 : :
656 : 12898 : X(m_conn_type);
657 : 12898 : }
658 : : #undef X
659 : :
660 : 251598 : bool CNode::ReceiveMsgBytes(std::span<const uint8_t> msg_bytes, bool& complete)
661 : : {
662 : 251598 : complete = false;
663 : 251598 : const auto time = GetTime<std::chrono::microseconds>();
664 : 251598 : LOCK(cs_vRecv);
665 : 251598 : m_last_recv = std::chrono::duration_cast<std::chrono::seconds>(time);
666 : 251598 : nRecvBytes += msg_bytes.size();
667 [ + + ]: 923897 : while (msg_bytes.size() > 0) {
668 : : // absorb network data
669 [ + - + + ]: 420711 : if (!m_transport->ReceivedBytes(msg_bytes)) {
670 : : // Serious transport problem, disconnect from the peer.
671 : : return false;
672 : : }
673 : :
674 [ + - + + ]: 420701 : if (m_transport->ReceivedMessageComplete()) {
675 : : // decompose a transport agnostic CNetMessage from the deserializer
676 : 163029 : bool reject_message{false};
677 [ + - ]: 163029 : CNetMessage msg = m_transport->GetReceivedMessage(time, reject_message);
678 [ + + ]: 163029 : if (reject_message) {
679 : : // Message deserialization failed. Drop the message but don't disconnect the peer.
680 : : // store the size of the corrupt message
681 [ + - ]: 82 : mapRecvBytesPerMsgType.at(NET_MESSAGE_TYPE_OTHER) += msg.m_raw_message_size;
682 : 82 : continue;
683 : : }
684 : :
685 : : // Store received bytes per message type.
686 : : // To prevent a memory DOS, only allow known message types.
687 : 162947 : auto i = mapRecvBytesPerMsgType.find(msg.m_type);
688 [ + + ]: 162947 : if (i == mapRecvBytesPerMsgType.end()) {
689 : 6 : i = mapRecvBytesPerMsgType.find(NET_MESSAGE_TYPE_OTHER);
690 : : }
691 [ - + ]: 162947 : assert(i != mapRecvBytesPerMsgType.end());
692 [ + - ]: 162947 : i->second += msg.m_raw_message_size;
693 : :
694 : : // push the message to the process queue,
695 [ + - ]: 162947 : vRecvMsg.push_back(std::move(msg));
696 : :
697 : 162947 : complete = true;
698 : 163029 : }
699 : : }
700 : :
701 : : return true;
702 : 251598 : }
703 : :
704 : 26738 : std::string CNode::LogPeer() const
705 : : {
706 : 26738 : auto peer_info{strprintf("peer=%d", GetId())};
707 [ + + ]: 26738 : if (fLogIPs) {
708 [ + - + - ]: 36 : return strprintf("%s, peeraddr=%s", peer_info, addr.ToStringAddrPort());
709 : : } else {
710 : 26720 : return peer_info;
711 : : }
712 : 26738 : }
713 : :
714 : 1582 : std::string CNode::DisconnectMsg() const
715 : : {
716 [ + - ]: 3164 : return strprintf("disconnecting %s", LogPeer());
717 : : }
718 : :
719 : 1791 : V1Transport::V1Transport(const NodeId node_id) noexcept
720 : 1791 : : m_magic_bytes{Params().MessageStart()}, m_node_id{node_id}
721 : : {
722 : 1791 : LOCK(m_recv_mutex);
723 [ + - ]: 1791 : Reset();
724 : 1791 : }
725 : :
726 : 12711 : Transport::Info V1Transport::GetInfo() const noexcept
727 : : {
728 : 12711 : return {.transport_type = TransportProtocolType::V1, .session_id = {}};
729 : : }
730 : :
731 : 155435 : int V1Transport::readHeader(std::span<const uint8_t> msg_bytes)
732 : : {
733 : 155435 : AssertLockHeld(m_recv_mutex);
734 : : // copy data to temporary parsing buffer
735 : 155435 : unsigned int nRemaining = CMessageHeader::HEADER_SIZE - nHdrPos;
736 [ + + ]: 155435 : unsigned int nCopy = std::min<unsigned int>(nRemaining, msg_bytes.size());
737 : :
738 [ + + ]: 155435 : memcpy(&hdrbuf[nHdrPos], msg_bytes.data(), nCopy);
739 : 155435 : nHdrPos += nCopy;
740 : :
741 : : // if header incomplete, exit
742 [ + + ]: 155435 : if (nHdrPos < CMessageHeader::HEADER_SIZE)
743 : 11 : return nCopy;
744 : :
745 : : // deserialize to CMessageHeader
746 : 155424 : try {
747 [ + - ]: 155424 : hdrbuf >> hdr;
748 : : }
749 [ - - ]: 0 : catch (const std::exception&) {
750 [ - - - - : 0 : LogDebug(BCLog::NET, "Header error: Unable to deserialize, peer=%d\n", m_node_id);
- - ]
751 : 0 : return -1;
752 : 0 : }
753 : :
754 : : // Check start string, network magic
755 [ + + ]: 155424 : if (hdr.pchMessageStart != m_magic_bytes) {
756 [ + - + - ]: 4 : LogDebug(BCLog::NET, "Header error: Wrong MessageStart %s received, peer=%d\n", HexStr(hdr.pchMessageStart), m_node_id);
757 : 2 : return -1;
758 : : }
759 : :
760 : : // reject messages larger than MAX_SIZE or MAX_PROTOCOL_MESSAGE_LENGTH
761 : : // NOTE: failing to perform this check previously allowed a malicious peer to make us allocate 32MiB of memory per
762 : : // connection. See https://bitcoincore.org/en/2024/07/03/disclose_receive_buffer_oom.
763 [ + + ]: 155422 : if (hdr.nMessageSize > MAX_SIZE || hdr.nMessageSize > MAX_PROTOCOL_MESSAGE_LENGTH) {
764 [ + - - + : 6 : LogDebug(BCLog::NET, "Header error: Size too large (%s, %u bytes), peer=%d\n", SanitizeString(hdr.GetMessageType()), hdr.nMessageSize, m_node_id);
+ - + - ]
765 : 3 : return -1;
766 : : }
767 : :
768 : : // switch state to reading message data
769 : 155419 : in_data = true;
770 : :
771 : 155419 : return nCopy;
772 : : }
773 : :
774 : 257117 : int V1Transport::readData(std::span<const uint8_t> msg_bytes)
775 : : {
776 : 257117 : AssertLockHeld(m_recv_mutex);
777 : 257117 : unsigned int nRemaining = hdr.nMessageSize - nDataPos;
778 [ + + ]: 257117 : unsigned int nCopy = std::min<unsigned int>(nRemaining, msg_bytes.size());
779 : :
780 [ - + + + ]: 257117 : if (vRecv.size() < nDataPos + nCopy) {
781 : : // Allocate up to 256 KiB ahead, but never more than the total message size.
782 [ + + ]: 317467 : vRecv.resize(std::min(hdr.nMessageSize, nDataPos + nCopy + 256 * 1024));
783 : : }
784 : :
785 : 257117 : hasher.Write(msg_bytes.first(nCopy));
786 : 257117 : memcpy(&vRecv[nDataPos], msg_bytes.data(), nCopy);
787 : 257117 : nDataPos += nCopy;
788 : :
789 : 257117 : return nCopy;
790 : : }
791 : :
792 : 155418 : const uint256& V1Transport::GetMessageHash() const
793 : : {
794 : 155418 : AssertLockHeld(m_recv_mutex);
795 [ + - - + ]: 155418 : assert(CompleteInternal());
796 [ + - ]: 310836 : if (data_hash.IsNull())
797 : 155418 : hasher.Finalize(data_hash);
798 : 155418 : return data_hash;
799 : : }
800 : :
801 : 155418 : CNetMessage V1Transport::GetReceivedMessage(const std::chrono::microseconds time, bool& reject_message)
802 : : {
803 : 155418 : AssertLockNotHeld(m_recv_mutex);
804 : : // Initialize out parameter
805 : 155418 : reject_message = false;
806 : : // decompose a single CNetMessage from the TransportDeserializer
807 : 155418 : LOCK(m_recv_mutex);
808 [ + - ]: 155418 : CNetMessage msg(std::move(vRecv));
809 : :
810 : : // store message type string, time, and sizes
811 [ + - ]: 155418 : msg.m_type = hdr.GetMessageType();
812 : 155418 : msg.m_time = time;
813 : 155418 : msg.m_message_size = hdr.nMessageSize;
814 : 155418 : msg.m_raw_message_size = hdr.nMessageSize + CMessageHeader::HEADER_SIZE;
815 : :
816 [ + - ]: 155418 : uint256 hash = GetMessageHash();
817 : :
818 : : // We just received a message off the wire, harvest entropy from the time (and the message checksum)
819 : 155418 : RandAddEvent(ReadLE32(hash.begin()));
820 : :
821 : : // Check checksum and header message type string
822 [ + + ]: 155418 : if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) {
823 [ + - + - : 2 : LogDebug(BCLog::NET, "Header error: Wrong checksum (%s, %u bytes), expected %s was %s, peer=%d\n",
+ - + - -
+ + - +
- ]
824 : : SanitizeString(msg.m_type), msg.m_message_size,
825 : : HexStr(std::span{hash}.first(CMessageHeader::CHECKSUM_SIZE)),
826 : : HexStr(hdr.pchChecksum),
827 : : m_node_id);
828 : 1 : reject_message = true;
829 [ + - + + ]: 155417 : } else if (!hdr.IsMessageTypeValid()) {
830 [ + - + - : 243 : LogDebug(BCLog::NET, "Header error: Invalid message type (%s, %u bytes), peer=%d\n",
+ - + - +
- ]
831 : : SanitizeString(hdr.GetMessageType()), msg.m_message_size, m_node_id);
832 : 81 : reject_message = true;
833 : : }
834 : :
835 : : // Always reset the network deserializer (prepare for the next message)
836 [ + - ]: 155418 : Reset();
837 [ + - ]: 155418 : return msg;
838 : 155418 : }
839 : :
840 : 161333 : bool V1Transport::SetMessageToSend(CSerializedNetMsg& msg) noexcept
841 : : {
842 : 161333 : AssertLockNotHeld(m_send_mutex);
843 : : // Determine whether a new message can be set.
844 : 161333 : LOCK(m_send_mutex);
845 [ + - - + : 161333 : if (m_sending_header || m_bytes_sent < m_message_to_send.data.size()) return false;
+ + ]
846 : :
847 : : // create dbl-sha256 checksum
848 : 160855 : uint256 hash = Hash(msg.data);
849 : :
850 : : // create header
851 [ - + ]: 160855 : CMessageHeader hdr(m_magic_bytes, msg.m_type.c_str(), msg.data.size());
852 [ + + ]: 160855 : memcpy(hdr.pchChecksum, hash.begin(), CMessageHeader::CHECKSUM_SIZE);
853 : :
854 : : // serialize header
855 [ + + ]: 160855 : m_header_to_send.clear();
856 : 160855 : VectorWriter{m_header_to_send, 0, hdr};
857 : :
858 : : // update state
859 : 160855 : m_message_to_send = std::move(msg);
860 : 160855 : m_sending_header = true;
861 : 160855 : m_bytes_sent = 0;
862 : 160855 : return true;
863 : 161333 : }
864 : :
865 : 1358316 : Transport::BytesToSend V1Transport::GetBytesToSend(bool have_next_message) const noexcept
866 : : {
867 : 1358316 : AssertLockNotHeld(m_send_mutex);
868 : 1358316 : LOCK(m_send_mutex);
869 [ + + ]: 1358316 : if (m_sending_header) {
870 [ - + + + ]: 160876 : return {std::span{m_header_to_send}.subspan(m_bytes_sent),
871 : : // We have more to send after the header if the message has payload, or if there
872 : : // is a next message after that.
873 [ + + + + ]: 160876 : have_next_message || !m_message_to_send.data.empty(),
874 : 160876 : m_message_to_send.m_type
875 : 160876 : };
876 : : } else {
877 [ - + ]: 1197440 : return {std::span{m_message_to_send.data}.subspan(m_bytes_sent),
878 : : // We only have more to send after this message's payload if there is another
879 : : // message.
880 : : have_next_message,
881 : 1197440 : m_message_to_send.m_type
882 : 1197440 : };
883 : : }
884 : 1358316 : }
885 : :
886 : 316618 : void V1Transport::MarkBytesSent(size_t bytes_sent) noexcept
887 : : {
888 : 316618 : AssertLockNotHeld(m_send_mutex);
889 : 316618 : LOCK(m_send_mutex);
890 : 316618 : m_bytes_sent += bytes_sent;
891 [ + + - + : 316618 : if (m_sending_header && m_bytes_sent == m_header_to_send.size()) {
+ - ]
892 : : // We're done sending a message's header. Switch to sending its data bytes.
893 : 160848 : m_sending_header = false;
894 : 160848 : m_bytes_sent = 0;
895 [ + - - + : 155770 : } else if (!m_sending_header && m_bytes_sent == m_message_to_send.data.size()) {
+ + ]
896 : : // We're done sending a message's data. Wipe the data vector to reduce memory consumption.
897 : 155260 : ClearShrink(m_message_to_send.data);
898 : 155260 : m_bytes_sent = 0;
899 : : }
900 : 316618 : }
901 : :
902 : 321746 : size_t V1Transport::GetSendMemoryUsage() const noexcept
903 : : {
904 : 321746 : AssertLockNotHeld(m_send_mutex);
905 : 321746 : LOCK(m_send_mutex);
906 : : // Don't count sending-side fields besides m_message_to_send, as they're all small and bounded.
907 [ + - ]: 321746 : return m_message_to_send.GetMemoryUsage();
908 : 321746 : }
909 : :
910 : : namespace {
911 : :
912 : : /** List of short messages as defined in BIP324, in order.
913 : : *
914 : : * Only message types that are actually implemented in this codebase need to be listed, as other
915 : : * messages get ignored anyway - whether we know how to decode them or not.
916 : : */
917 : : const std::array<std::string, 33> V2_MESSAGE_IDS = {
918 : : "", // 12 bytes follow encoding the message type like in V1
919 : : NetMsgType::ADDR,
920 : : NetMsgType::BLOCK,
921 : : NetMsgType::BLOCKTXN,
922 : : NetMsgType::CMPCTBLOCK,
923 : : NetMsgType::FEEFILTER,
924 : : NetMsgType::FILTERADD,
925 : : NetMsgType::FILTERCLEAR,
926 : : NetMsgType::FILTERLOAD,
927 : : NetMsgType::GETBLOCKS,
928 : : NetMsgType::GETBLOCKTXN,
929 : : NetMsgType::GETDATA,
930 : : NetMsgType::GETHEADERS,
931 : : NetMsgType::HEADERS,
932 : : NetMsgType::INV,
933 : : NetMsgType::MEMPOOL,
934 : : NetMsgType::MERKLEBLOCK,
935 : : NetMsgType::NOTFOUND,
936 : : NetMsgType::PING,
937 : : NetMsgType::PONG,
938 : : NetMsgType::SENDCMPCT,
939 : : NetMsgType::TX,
940 : : NetMsgType::GETCFILTERS,
941 : : NetMsgType::CFILTER,
942 : : NetMsgType::GETCFHEADERS,
943 : : NetMsgType::CFHEADERS,
944 : : NetMsgType::GETCFCHECKPT,
945 : : NetMsgType::CFCHECKPT,
946 : : NetMsgType::ADDRV2,
947 : : // Unimplemented message types that are assigned in BIP324:
948 : : "",
949 : : "",
950 : : "",
951 : : ""
952 : : };
953 : :
954 : : class V2MessageMap
955 : : {
956 : : std::unordered_map<std::string, uint8_t> m_map;
957 : :
958 : : public:
959 : 1370 : V2MessageMap() noexcept
960 : 1370 : {
961 [ + + ]: 45210 : for (size_t i = 1; i < std::size(V2_MESSAGE_IDS); ++i) {
962 : 43840 : m_map.emplace(V2_MESSAGE_IDS[i], i);
963 : : }
964 : 1370 : }
965 : :
966 : 8404 : std::optional<uint8_t> operator()(const std::string& message_name) const noexcept
967 : : {
968 : 8404 : auto it = m_map.find(message_name);
969 [ + + ]: 8404 : if (it == m_map.end()) return std::nullopt;
970 : 7599 : return it->second;
971 : : }
972 : : };
973 : :
974 : : const V2MessageMap V2_MESSAGE_MAP;
975 : :
976 : 252 : std::vector<uint8_t> GenerateRandomGarbage() noexcept
977 : : {
978 : 252 : std::vector<uint8_t> ret;
979 : 252 : FastRandomContext rng;
980 : 252 : ret.resize(rng.randrange(V2Transport::MAX_GARBAGE_LEN + 1));
981 : 252 : rng.fillrand(MakeWritableByteSpan(ret));
982 : 252 : return ret;
983 : 252 : }
984 : :
985 : : } // namespace
986 : :
987 : 246 : void V2Transport::StartSendingHandshake() noexcept
988 : : {
989 : 246 : AssertLockHeld(m_send_mutex);
990 [ - + ]: 246 : Assume(m_send_state == SendState::AWAITING_KEY);
991 : 246 : Assume(m_send_buffer.empty());
992 : : // Initialize the send buffer with ellswift pubkey + provided garbage.
993 [ - + ]: 246 : m_send_buffer.resize(EllSwiftPubKey::size() + m_send_garbage.size());
994 : 246 : std::copy(std::begin(m_cipher.GetOurPubKey()), std::end(m_cipher.GetOurPubKey()), MakeWritableByteSpan(m_send_buffer).begin());
995 : 246 : std::copy(m_send_garbage.begin(), m_send_garbage.end(), m_send_buffer.begin() + EllSwiftPubKey::size());
996 : : // We cannot wipe m_send_garbage as it will still be used as AAD later in the handshake.
997 : 246 : }
998 : :
999 : 252 : V2Transport::V2Transport(NodeId nodeid, bool initiating, const CKey& key, std::span<const std::byte> ent32, std::vector<uint8_t> garbage) noexcept
1000 : 252 : : m_cipher{key, ent32},
1001 : 252 : m_initiating{initiating},
1002 : 252 : m_nodeid{nodeid},
1003 : 252 : m_v1_fallback{nodeid},
1004 [ + + ]: 252 : m_recv_state{initiating ? RecvState::KEY : RecvState::KEY_MAYBE_V1},
1005 [ - + ]: 252 : m_send_garbage{std::move(garbage)},
1006 [ + + - + ]: 635 : m_send_state{initiating ? SendState::AWAITING_KEY : SendState::MAYBE_V1}
1007 : : {
1008 [ - + + + ]: 252 : Assume(m_send_garbage.size() <= MAX_GARBAGE_LEN);
1009 : : // Start sending immediately if we're the initiator of the connection.
1010 [ + + ]: 252 : if (initiating) {
1011 : 121 : LOCK(m_send_mutex);
1012 [ + - ]: 121 : StartSendingHandshake();
1013 : 121 : }
1014 : 252 : }
1015 : :
1016 : 252 : V2Transport::V2Transport(NodeId nodeid, bool initiating) noexcept
1017 : 504 : : V2Transport{nodeid, initiating, GenerateRandomKey(),
1018 : 504 : MakeByteSpan(GetRandHash()), GenerateRandomGarbage()} {}
1019 : :
1020 : 16566 : void V2Transport::SetReceiveState(RecvState recv_state) noexcept
1021 : : {
1022 : 16566 : AssertLockHeld(m_recv_mutex);
1023 : : // Enforce allowed state transitions.
1024 [ + + + + : 16566 : switch (m_recv_state) {
+ + - - ]
1025 : 131 : case RecvState::KEY_MAYBE_V1:
1026 : 131 : Assume(recv_state == RecvState::KEY || recv_state == RecvState::V1);
1027 : 131 : break;
1028 : 241 : case RecvState::KEY:
1029 : 241 : Assume(recv_state == RecvState::GARB_GARBTERM);
1030 : 241 : break;
1031 : 235 : case RecvState::GARB_GARBTERM:
1032 : 235 : Assume(recv_state == RecvState::VERSION);
1033 : 235 : break;
1034 : 233 : case RecvState::VERSION:
1035 : 233 : Assume(recv_state == RecvState::APP);
1036 : 233 : break;
1037 : 7863 : case RecvState::APP:
1038 : 7863 : Assume(recv_state == RecvState::APP_READY);
1039 : 7863 : break;
1040 : 7863 : case RecvState::APP_READY:
1041 : 7863 : Assume(recv_state == RecvState::APP);
1042 : 7863 : break;
1043 : 0 : case RecvState::V1:
1044 : 0 : Assume(false); // V1 state cannot be left
1045 : 0 : break;
1046 : : }
1047 : : // Change state.
1048 : 16566 : m_recv_state = recv_state;
1049 : 16566 : }
1050 : :
1051 : 372 : void V2Transport::SetSendState(SendState send_state) noexcept
1052 : : {
1053 : 372 : AssertLockHeld(m_send_mutex);
1054 : : // Enforce allowed state transitions.
1055 [ + + - - ]: 372 : switch (m_send_state) {
1056 : 131 : case SendState::MAYBE_V1:
1057 : 131 : Assume(send_state == SendState::V1 || send_state == SendState::AWAITING_KEY);
1058 : 131 : break;
1059 : 241 : case SendState::AWAITING_KEY:
1060 : 241 : Assume(send_state == SendState::READY);
1061 : 241 : break;
1062 : 0 : case SendState::READY:
1063 : 0 : case SendState::V1:
1064 : 0 : Assume(false); // Final states
1065 : 0 : break;
1066 : : }
1067 : : // Change state.
1068 : 372 : m_send_state = send_state;
1069 : 372 : }
1070 : :
1071 : 11515 : bool V2Transport::ReceivedMessageComplete() const noexcept
1072 : : {
1073 : 11515 : AssertLockNotHeld(m_recv_mutex);
1074 : 11515 : LOCK(m_recv_mutex);
1075 [ + + ]: 11515 : if (m_recv_state == RecvState::V1) return m_v1_fallback.ReceivedMessageComplete();
1076 : :
1077 : 11107 : return m_recv_state == RecvState::APP_READY;
1078 : 11515 : }
1079 : :
1080 : 132 : void V2Transport::ProcessReceivedMaybeV1Bytes() noexcept
1081 : : {
1082 : 132 : AssertLockHeld(m_recv_mutex);
1083 : 132 : AssertLockNotHeld(m_send_mutex);
1084 : 132 : Assume(m_recv_state == RecvState::KEY_MAYBE_V1);
1085 : : // We still have to determine if this is a v1 or v2 connection. The bytes being received could
1086 : : // be the beginning of either a v1 packet (network magic + "version\x00\x00\x00\x00\x00"), or
1087 : : // of a v2 public key. BIP324 specifies that a mismatch with this 16-byte string should trigger
1088 : : // sending of the key.
1089 : 132 : std::array<uint8_t, V1_PREFIX_LEN> v1_prefix = {0, 0, 0, 0, 'v', 'e', 'r', 's', 'i', 'o', 'n', 0, 0, 0, 0, 0};
1090 : 132 : std::copy(std::begin(Params().MessageStart()), std::end(Params().MessageStart()), v1_prefix.begin());
1091 [ - + + + ]: 132 : Assume(m_recv_buffer.size() <= v1_prefix.size());
1092 [ + + ]: 132 : if (!std::equal(m_recv_buffer.begin(), m_recv_buffer.end(), v1_prefix.begin())) {
1093 : : // Mismatch with v1 prefix, so we can assume a v2 connection.
1094 : 125 : SetReceiveState(RecvState::KEY); // Convert to KEY state, leaving received bytes around.
1095 : : // Transition the sender to AWAITING_KEY state and start sending.
1096 : 125 : LOCK(m_send_mutex);
1097 : 125 : SetSendState(SendState::AWAITING_KEY);
1098 [ + - ]: 125 : StartSendingHandshake();
1099 [ + + ]: 132 : } else if (m_recv_buffer.size() == v1_prefix.size()) {
1100 : : // Full match with the v1 prefix, so fall back to v1 behavior.
1101 : 6 : LOCK(m_send_mutex);
1102 [ - + ]: 6 : std::span<const uint8_t> feedback{m_recv_buffer};
1103 : : // Feed already received bytes to v1 transport. It should always accept these, because it's
1104 : : // less than the size of a v1 header, and these are the first bytes fed to m_v1_fallback.
1105 : 6 : bool ret = m_v1_fallback.ReceivedBytes(feedback);
1106 : 6 : Assume(feedback.empty());
1107 : 6 : Assume(ret);
1108 : 6 : SetReceiveState(RecvState::V1);
1109 : 6 : SetSendState(SendState::V1);
1110 : : // Reset v2 transport buffers to save memory.
1111 : 6 : ClearShrink(m_recv_buffer);
1112 [ + - ]: 6 : ClearShrink(m_send_buffer);
1113 : 6 : } else {
1114 : : // We have not received enough to distinguish v1 from v2 yet. Wait until more bytes come.
1115 : : }
1116 : 132 : }
1117 : :
1118 : 328 : bool V2Transport::ProcessReceivedKeyBytes() noexcept
1119 : : {
1120 : 328 : AssertLockHeld(m_recv_mutex);
1121 : 328 : AssertLockNotHeld(m_send_mutex);
1122 [ - + ]: 328 : Assume(m_recv_state == RecvState::KEY);
1123 [ - + + + ]: 328 : Assume(m_recv_buffer.size() <= EllSwiftPubKey::size());
1124 : :
1125 : : // As a special exception, if bytes 4-16 of the key on a responder connection match the
1126 : : // corresponding bytes of a V1 version message, but bytes 0-4 don't match the network magic
1127 : : // (if they did, we'd have switched to V1 state already), assume this is a peer from
1128 : : // another network, and disconnect them. They will almost certainly disconnect us too when
1129 : : // they receive our uniformly random key and garbage, but detecting this case specially
1130 : : // means we can log it.
1131 : 328 : static constexpr std::array<uint8_t, 12> MATCH = {'v', 'e', 'r', 's', 'i', 'o', 'n', 0, 0, 0, 0, 0};
1132 : 328 : static constexpr size_t OFFSET = std::tuple_size_v<MessageStartChars>;
1133 [ + + + + ]: 328 : if (!m_initiating && m_recv_buffer.size() >= OFFSET + MATCH.size()) {
1134 [ + + ]: 162 : if (std::equal(MATCH.begin(), MATCH.end(), m_recv_buffer.begin() + OFFSET)) {
1135 [ + - - + ]: 2 : LogDebug(BCLog::NET, "V2 transport error: V1 peer with wrong MessageStart %s\n",
1136 : : HexStr(std::span(m_recv_buffer).first(OFFSET)));
1137 : 2 : return false;
1138 : : }
1139 : : }
1140 : :
1141 [ + + ]: 326 : if (m_recv_buffer.size() == EllSwiftPubKey::size()) {
1142 : : // Other side's key has been fully received, and can now be Diffie-Hellman combined with
1143 : : // our key to initialize the encryption ciphers.
1144 : :
1145 : : // Initialize the ciphers.
1146 : 241 : EllSwiftPubKey ellswift(MakeByteSpan(m_recv_buffer));
1147 : 241 : LOCK(m_send_mutex);
1148 : 241 : m_cipher.Initialize(ellswift, m_initiating);
1149 : :
1150 : : // Switch receiver state to GARB_GARBTERM.
1151 : 241 : SetReceiveState(RecvState::GARB_GARBTERM);
1152 [ + - ]: 241 : m_recv_buffer.clear();
1153 : :
1154 : : // Switch sender state to READY.
1155 : 241 : SetSendState(SendState::READY);
1156 : :
1157 : : // Append the garbage terminator to the send buffer.
1158 [ - + ]: 241 : m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1159 : 241 : std::copy(m_cipher.GetSendGarbageTerminator().begin(),
1160 : 241 : m_cipher.GetSendGarbageTerminator().end(),
1161 : 241 : MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN).begin());
1162 : :
1163 : : // Construct version packet in the send buffer, with the sent garbage data as AAD.
1164 [ - + ]: 241 : m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::EXPANSION + VERSION_CONTENTS.size());
1165 : 241 : m_cipher.Encrypt(
1166 : : /*contents=*/VERSION_CONTENTS,
1167 : 241 : /*aad=*/MakeByteSpan(m_send_garbage),
1168 : : /*ignore=*/false,
1169 : 241 : /*output=*/MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::EXPANSION + VERSION_CONTENTS.size()));
1170 : : // We no longer need the garbage.
1171 [ + - ]: 241 : ClearShrink(m_send_garbage);
1172 : 241 : } else {
1173 : : // We still have to receive more key bytes.
1174 : : }
1175 : : return true;
1176 : : }
1177 : :
1178 : 516289 : bool V2Transport::ProcessReceivedGarbageBytes() noexcept
1179 : : {
1180 : 516289 : AssertLockHeld(m_recv_mutex);
1181 [ - + ]: 516289 : Assume(m_recv_state == RecvState::GARB_GARBTERM);
1182 [ - + + + ]: 516289 : Assume(m_recv_buffer.size() <= MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1183 [ + + ]: 516289 : if (m_recv_buffer.size() >= BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
1184 [ + + ]: 512674 : if (std::ranges::equal(MakeByteSpan(m_recv_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN), m_cipher.GetReceiveGarbageTerminator())) {
1185 : : // Garbage terminator received. Store garbage to authenticate it as AAD later.
1186 : 235 : m_recv_aad = std::move(m_recv_buffer);
1187 [ - + ]: 235 : m_recv_aad.resize(m_recv_aad.size() - BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1188 [ - + ]: 235 : m_recv_buffer.clear();
1189 : 235 : SetReceiveState(RecvState::VERSION);
1190 [ + + ]: 512439 : } else if (m_recv_buffer.size() == MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
1191 : : // We've reached the maximum length for garbage + garbage terminator, and the
1192 : : // terminator still does not match. Abort.
1193 [ + - ]: 4 : LogDebug(BCLog::NET, "V2 transport error: missing garbage terminator, peer=%d\n", m_nodeid);
1194 : 4 : return false;
1195 : : } else {
1196 : : // We still need to receive more garbage and/or garbage terminator bytes.
1197 : : }
1198 : : } else {
1199 : : // We have less than GARBAGE_TERMINATOR_LEN (16) bytes, so we certainly need to receive
1200 : : // more first.
1201 : : }
1202 : : return true;
1203 : : }
1204 : :
1205 : 120253 : bool V2Transport::ProcessReceivedPacketBytes() noexcept
1206 : : {
1207 : 120253 : AssertLockHeld(m_recv_mutex);
1208 [ - + ]: 120253 : Assume(m_recv_state == RecvState::VERSION || m_recv_state == RecvState::APP);
1209 : :
1210 : : // The maximum permitted contents length for a packet, consisting of:
1211 : : // - 0x00 byte: indicating long message type encoding
1212 : : // - 12 bytes of message type
1213 : : // - payload
1214 : 120253 : static constexpr size_t MAX_CONTENTS_LEN =
1215 : : 1 + CMessageHeader::MESSAGE_TYPE_SIZE +
1216 : : std::min<size_t>(MAX_SIZE, MAX_PROTOCOL_MESSAGE_LENGTH);
1217 : :
1218 [ - + + + ]: 120253 : if (m_recv_buffer.size() == BIP324Cipher::LENGTH_LEN) {
1219 : : // Length descriptor received.
1220 : 59374 : m_recv_len = m_cipher.DecryptLength(MakeByteSpan(m_recv_buffer));
1221 [ + + ]: 59374 : if (m_recv_len > MAX_CONTENTS_LEN) {
1222 [ + - ]: 10 : LogDebug(BCLog::NET, "V2 transport error: packet too large (%u bytes), peer=%d\n", m_recv_len, m_nodeid);
1223 : 10 : return false;
1224 : : }
1225 [ + + + + ]: 60879 : } else if (m_recv_buffer.size() > BIP324Cipher::LENGTH_LEN && m_recv_buffer.size() == m_recv_len + BIP324Cipher::EXPANSION) {
1226 : : // Ciphertext received, decrypt it into m_recv_decode_buffer.
1227 : : // Note that it is impossible to reach this branch without hitting the branch above first,
1228 : : // as GetMaxBytesToProcess only allows up to LENGTH_LEN into the buffer before that point.
1229 : 59364 : m_recv_decode_buffer.resize(m_recv_len);
1230 : 59364 : bool ignore{false};
1231 : 118728 : bool ret = m_cipher.Decrypt(
1232 : 59364 : /*input=*/MakeByteSpan(m_recv_buffer).subspan(BIP324Cipher::LENGTH_LEN),
1233 : 59364 : /*aad=*/MakeByteSpan(m_recv_aad),
1234 : : /*ignore=*/ignore,
1235 : : /*contents=*/MakeWritableByteSpan(m_recv_decode_buffer));
1236 [ + + ]: 59364 : if (!ret) {
1237 [ + - ]: 12 : LogDebug(BCLog::NET, "V2 transport error: packet decryption failure (%u bytes), peer=%d\n", m_recv_len, m_nodeid);
1238 : 12 : return false;
1239 : : }
1240 : : // We have decrypted a valid packet with the AAD we expected, so clear the expected AAD.
1241 : 59352 : ClearShrink(m_recv_aad);
1242 : : // Feed the last 4 bytes of the Poly1305 authentication tag (and its timing) into our RNG.
1243 [ - + ]: 59352 : RandAddEvent(ReadLE32(m_recv_buffer.data() + m_recv_buffer.size() - 4));
1244 : :
1245 : : // At this point we have a valid packet decrypted into m_recv_decode_buffer. If it's not a
1246 : : // decoy, which we simply ignore, use the current state to decide what to do with it.
1247 [ + + ]: 59352 : if (!ignore) {
1248 [ + + - ]: 8096 : switch (m_recv_state) {
1249 : 233 : case RecvState::VERSION:
1250 : : // Version message received; transition to application phase. The contents is
1251 : : // ignored, but can be used for future extensions.
1252 : 233 : SetReceiveState(RecvState::APP);
1253 : 233 : break;
1254 : 7863 : case RecvState::APP:
1255 : : // Application message decrypted correctly. It can be extracted using GetMessage().
1256 : 7863 : SetReceiveState(RecvState::APP_READY);
1257 : 7863 : break;
1258 : 0 : default:
1259 : : // Any other state is invalid (this function should not have been called).
1260 : 0 : Assume(false);
1261 : : }
1262 : : }
1263 : : // Wipe the receive buffer where the next packet will be received into.
1264 : 59352 : ClearShrink(m_recv_buffer);
1265 : : // In all but APP_READY state, we can wipe the decoded contents.
1266 [ + + ]: 59352 : if (m_recv_state != RecvState::APP_READY) ClearShrink(m_recv_decode_buffer);
1267 : : } else {
1268 : : // We either have less than 3 bytes, so we don't know the packet's length yet, or more
1269 : : // than 3 bytes but less than the packet's full ciphertext. Wait until those arrive.
1270 : : }
1271 : : return true;
1272 : : }
1273 : :
1274 : 639188 : size_t V2Transport::GetMaxBytesToProcess() noexcept
1275 : : {
1276 : 639188 : AssertLockHeld(m_recv_mutex);
1277 [ + + + + : 639188 : switch (m_recv_state) {
- - + ]
1278 : 132 : case RecvState::KEY_MAYBE_V1:
1279 : : // During the KEY_MAYBE_V1 state we do not allow more than the length of v1 prefix into the
1280 : : // receive buffer.
1281 [ - + ]: 132 : Assume(m_recv_buffer.size() <= V1_PREFIX_LEN);
1282 : : // As long as we're not sure if this is a v1 or v2 connection, don't receive more than what
1283 : : // is strictly necessary to distinguish the two (16 bytes). If we permitted more than
1284 : : // the v1 header size (24 bytes), we may not be able to feed the already-received bytes
1285 : : // back into the m_v1_fallback V1 transport.
1286 : 132 : return V1_PREFIX_LEN - m_recv_buffer.size();
1287 : 328 : case RecvState::KEY:
1288 : : // During the KEY state, we only allow the 64-byte key into the receive buffer.
1289 [ - + ]: 328 : Assume(m_recv_buffer.size() <= EllSwiftPubKey::size());
1290 : : // As long as we have not received the other side's public key, don't receive more than
1291 : : // that (64 bytes), as garbage follows, and locating the garbage terminator requires the
1292 : : // key exchange first.
1293 : 328 : return EllSwiftPubKey::size() - m_recv_buffer.size();
1294 : : case RecvState::GARB_GARBTERM:
1295 : : // Process garbage bytes one by one (because terminator may appear anywhere).
1296 : : return 1;
1297 : 120253 : case RecvState::VERSION:
1298 : 120253 : case RecvState::APP:
1299 : : // These three states all involve decoding a packet. Process the length descriptor first,
1300 : : // so that we know where the current packet ends (and we don't process bytes from the next
1301 : : // packet or decoy yet). Then, process the ciphertext bytes of the current packet.
1302 [ - + + + ]: 120253 : if (m_recv_buffer.size() < BIP324Cipher::LENGTH_LEN) {
1303 : 59387 : return BIP324Cipher::LENGTH_LEN - m_recv_buffer.size();
1304 : : } else {
1305 : : // Note that BIP324Cipher::EXPANSION is the total difference between contents size
1306 : : // and encoded packet size, which includes the 3 bytes due to the packet length.
1307 : : // When transitioning from receiving the packet length to receiving its ciphertext,
1308 : : // the encrypted packet length is left in the receive buffer.
1309 : 60866 : return BIP324Cipher::EXPANSION + m_recv_len - m_recv_buffer.size();
1310 : : }
1311 : 2186 : case RecvState::APP_READY:
1312 : : // No bytes can be processed until GetMessage() is called.
1313 : 2186 : return 0;
1314 : 0 : case RecvState::V1:
1315 : : // Not allowed (must be dealt with by the caller).
1316 : 0 : Assume(false);
1317 : 0 : return 0;
1318 : : }
1319 : 0 : Assume(false); // unreachable
1320 : 0 : return 0;
1321 : : }
1322 : :
1323 : 10848 : bool V2Transport::ReceivedBytes(std::span<const uint8_t>& msg_bytes) noexcept
1324 : : {
1325 : 10848 : AssertLockNotHeld(m_recv_mutex);
1326 : : /** How many bytes to allocate in the receive buffer at most above what is received so far. */
1327 : 10848 : static constexpr size_t MAX_RESERVE_AHEAD = 256 * 1024;
1328 : :
1329 : 10848 : LOCK(m_recv_mutex);
1330 [ + + ]: 10848 : if (m_recv_state == RecvState::V1) return m_v1_fallback.ReceivedBytes(msg_bytes);
1331 : :
1332 : : // Process the provided bytes in msg_bytes in a loop. In each iteration a nonzero number of
1333 : : // bytes (decided by GetMaxBytesToProcess) are taken from the beginning om msg_bytes, and
1334 : : // appended to m_recv_buffer. Then, depending on the receiver state, one of the
1335 : : // ProcessReceived*Bytes functions is called to process the bytes in that buffer.
1336 [ + + ]: 647414 : while (!msg_bytes.empty()) {
1337 : : // Decide how many bytes to copy from msg_bytes to m_recv_buffer.
1338 : 639188 : size_t max_read = GetMaxBytesToProcess();
1339 : :
1340 : : // Reserve space in the buffer if there is not enough.
1341 [ - + + + : 647431 : if (m_recv_buffer.size() + std::min(msg_bytes.size(), max_read) > m_recv_buffer.capacity()) {
- + + + ]
1342 [ + + - - : 119076 : switch (m_recv_state) {
- ]
1343 : 249 : case RecvState::KEY_MAYBE_V1:
1344 : 249 : case RecvState::KEY:
1345 : 249 : case RecvState::GARB_GARBTERM:
1346 : : // During the initial states (key/garbage), allocate once to fit the maximum (4111
1347 : : // bytes).
1348 : 249 : m_recv_buffer.reserve(MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1349 : 249 : break;
1350 : 118827 : case RecvState::VERSION:
1351 : 118827 : case RecvState::APP: {
1352 : : // During states where a packet is being received, as much as is expected but never
1353 : : // more than MAX_RESERVE_AHEAD bytes in addition to what is received so far.
1354 : : // This means attackers that want to cause us to waste allocated memory are limited
1355 : : // to MAX_RESERVE_AHEAD above the largest allowed message contents size, and to
1356 : : // MAX_RESERVE_AHEAD more than they've actually sent us.
1357 [ + + ]: 118827 : size_t alloc_add = std::min(max_read, msg_bytes.size() + MAX_RESERVE_AHEAD);
1358 : 118827 : m_recv_buffer.reserve(m_recv_buffer.size() + alloc_add);
1359 : 118827 : break;
1360 : : }
1361 : 0 : case RecvState::APP_READY:
1362 : : // The buffer is empty in this state.
1363 : 0 : Assume(m_recv_buffer.empty());
1364 : 0 : break;
1365 : 0 : case RecvState::V1:
1366 : : // Should have bailed out above.
1367 : 0 : Assume(false);
1368 : 0 : break;
1369 : : }
1370 : : }
1371 : :
1372 : : // Can't read more than provided input.
1373 [ + + ]: 639188 : max_read = std::min(msg_bytes.size(), max_read);
1374 : : // Copy data to buffer.
1375 : 639188 : m_recv_buffer.insert(m_recv_buffer.end(), UCharCast(msg_bytes.data()), UCharCast(msg_bytes.data() + max_read));
1376 [ + + + + : 639188 : msg_bytes = msg_bytes.subspan(max_read);
- - + ]
1377 : :
1378 : : // Process data in the buffer.
1379 [ + + + + : 639188 : switch (m_recv_state) {
- - + ]
1380 : 132 : case RecvState::KEY_MAYBE_V1:
1381 : 132 : ProcessReceivedMaybeV1Bytes();
1382 [ + + ]: 132 : if (m_recv_state == RecvState::V1) return true;
1383 : : break;
1384 : :
1385 : 328 : case RecvState::KEY:
1386 [ + + ]: 328 : if (!ProcessReceivedKeyBytes()) return false;
1387 : : break;
1388 : :
1389 : 516289 : case RecvState::GARB_GARBTERM:
1390 [ + + ]: 516289 : if (!ProcessReceivedGarbageBytes()) return false;
1391 : : break;
1392 : :
1393 : 120253 : case RecvState::VERSION:
1394 : 120253 : case RecvState::APP:
1395 [ + + ]: 120253 : if (!ProcessReceivedPacketBytes()) return false;
1396 : : break;
1397 : :
1398 : : case RecvState::APP_READY:
1399 : : return true;
1400 : :
1401 : 0 : case RecvState::V1:
1402 : : // We should have bailed out before.
1403 : 0 : Assume(false);
1404 : 0 : break;
1405 : : }
1406 : : // Make sure we have made progress before continuing.
1407 : 636968 : Assume(max_read > 0);
1408 : : }
1409 : :
1410 : : return true;
1411 : 10848 : }
1412 : :
1413 : 7863 : std::optional<std::string> V2Transport::GetMessageType(std::span<const uint8_t>& contents) noexcept
1414 : : {
1415 [ - + ]: 7863 : if (contents.size() == 0) return std::nullopt; // Empty contents
1416 [ + + ]: 7863 : uint8_t first_byte = contents[0];
1417 [ + + ]: 7863 : contents = contents.subspan(1); // Strip first byte.
1418 : :
1419 [ + + ]: 7863 : if (first_byte != 0) {
1420 : : // Short (1 byte) encoding.
1421 [ + + ]: 6999 : if (first_byte < std::size(V2_MESSAGE_IDS)) {
1422 : : // Valid short message id.
1423 [ - + ]: 13996 : return V2_MESSAGE_IDS[first_byte];
1424 : : } else {
1425 : : // Unknown short message id.
1426 : 1 : return std::nullopt;
1427 : : }
1428 : : }
1429 : :
1430 [ + + ]: 864 : if (contents.size() < CMessageHeader::MESSAGE_TYPE_SIZE) {
1431 : 10 : return std::nullopt; // Long encoding needs 12 message type bytes.
1432 : : }
1433 : :
1434 : : size_t msg_type_len{0};
1435 [ + - + + ]: 7763 : while (msg_type_len < CMessageHeader::MESSAGE_TYPE_SIZE && contents[msg_type_len] != 0) {
1436 : : // Verify that message type bytes before the first 0x00 are in range.
1437 [ - + + - ]: 6909 : if (contents[msg_type_len] < ' ' || contents[msg_type_len] > 0x7F) {
1438 : 0 : return {};
1439 : : }
1440 : 6909 : ++msg_type_len;
1441 : : }
1442 : 854 : std::string ret{reinterpret_cast<const char*>(contents.data()), msg_type_len};
1443 [ + + ]: 4093 : while (msg_type_len < CMessageHeader::MESSAGE_TYPE_SIZE) {
1444 : : // Verify that message type bytes after the first 0x00 are also 0x00.
1445 [ + + ]: 3289 : if (contents[msg_type_len] != 0) return {};
1446 : 3239 : ++msg_type_len;
1447 : : }
1448 : : // Strip message type bytes of contents.
1449 : 804 : contents = contents.subspan(CMessageHeader::MESSAGE_TYPE_SIZE);
1450 : 804 : return ret;
1451 : 854 : }
1452 : :
1453 : 8071 : CNetMessage V2Transport::GetReceivedMessage(std::chrono::microseconds time, bool& reject_message) noexcept
1454 : : {
1455 : 8071 : AssertLockNotHeld(m_recv_mutex);
1456 : 8071 : LOCK(m_recv_mutex);
1457 [ + + ]: 8071 : if (m_recv_state == RecvState::V1) return m_v1_fallback.GetReceivedMessage(time, reject_message);
1458 : :
1459 [ - + ]: 7863 : Assume(m_recv_state == RecvState::APP_READY);
1460 [ - + ]: 7863 : std::span<const uint8_t> contents{m_recv_decode_buffer};
1461 : 7863 : auto msg_type = GetMessageType(contents);
1462 : 7863 : CNetMessage msg{DataStream{}};
1463 : : // Note that BIP324Cipher::EXPANSION also includes the length descriptor size.
1464 [ - + ]: 7863 : msg.m_raw_message_size = m_recv_decode_buffer.size() + BIP324Cipher::EXPANSION;
1465 [ + + ]: 7863 : if (msg_type) {
1466 : 7802 : reject_message = false;
1467 : 7802 : msg.m_type = std::move(*msg_type);
1468 : 7802 : msg.m_time = time;
1469 : 7802 : msg.m_message_size = contents.size();
1470 : 7802 : msg.m_recv.resize(contents.size());
1471 : 7802 : std::copy(contents.begin(), contents.end(), UCharCast(msg.m_recv.data()));
1472 : : } else {
1473 [ + - - + ]: 61 : LogDebug(BCLog::NET, "V2 transport error: invalid message type (%u bytes contents), peer=%d\n", m_recv_decode_buffer.size(), m_nodeid);
1474 : 61 : reject_message = true;
1475 : : }
1476 : 7863 : ClearShrink(m_recv_decode_buffer);
1477 : 7863 : SetReceiveState(RecvState::APP);
1478 : :
1479 : 7863 : return msg;
1480 : 7863 : }
1481 : :
1482 : 8860 : bool V2Transport::SetMessageToSend(CSerializedNetMsg& msg) noexcept
1483 : : {
1484 : 8860 : AssertLockNotHeld(m_send_mutex);
1485 : 8860 : LOCK(m_send_mutex);
1486 [ + + ]: 8860 : if (m_send_state == SendState::V1) return m_v1_fallback.SetMessageToSend(msg);
1487 : : // We only allow adding a new message to be sent when in the READY state (so the packet cipher
1488 : : // is available) and the send buffer is empty. This limits the number of messages in the send
1489 : : // buffer to just one, and leaves the responsibility for queueing them up to the caller.
1490 [ + + + + ]: 8508 : if (!(m_send_state == SendState::READY && m_send_buffer.empty())) return false;
1491 : : // Construct contents (encoding message type + payload).
1492 : 8404 : std::vector<uint8_t> contents;
1493 : 8404 : auto short_message_id = V2_MESSAGE_MAP(msg.m_type);
1494 [ + + ]: 8404 : if (short_message_id) {
1495 [ - + ]: 7599 : contents.resize(1 + msg.data.size());
1496 : 7599 : contents[0] = *short_message_id;
1497 : 7599 : std::copy(msg.data.begin(), msg.data.end(), contents.begin() + 1);
1498 : : } else {
1499 : : // Initialize with zeroes, and then write the message type string starting at offset 1.
1500 : : // This means contents[0] and the unused positions in contents[1..13] remain 0x00.
1501 [ - + ]: 805 : contents.resize(1 + CMessageHeader::MESSAGE_TYPE_SIZE + msg.data.size(), 0);
1502 [ - + ]: 805 : std::copy(msg.m_type.begin(), msg.m_type.end(), contents.data() + 1);
1503 : 805 : std::copy(msg.data.begin(), msg.data.end(), contents.begin() + 1 + CMessageHeader::MESSAGE_TYPE_SIZE);
1504 : : }
1505 : : // Construct ciphertext in send buffer.
1506 [ - + ]: 8404 : m_send_buffer.resize(contents.size() + BIP324Cipher::EXPANSION);
1507 : 8404 : m_cipher.Encrypt(MakeByteSpan(contents), {}, false, MakeWritableByteSpan(m_send_buffer));
1508 : 8404 : m_send_type = msg.m_type;
1509 : : // Release memory
1510 : 8404 : ClearShrink(msg.data);
1511 : 8404 : return true;
1512 : 8404 : }
1513 : :
1514 : 58207 : Transport::BytesToSend V2Transport::GetBytesToSend(bool have_next_message) const noexcept
1515 : : {
1516 : 58207 : AssertLockNotHeld(m_send_mutex);
1517 : 58207 : LOCK(m_send_mutex);
1518 [ + + ]: 58207 : if (m_send_state == SendState::V1) return m_v1_fallback.GetBytesToSend(have_next_message);
1519 : :
1520 [ + + ]: 55764 : if (m_send_state == SendState::MAYBE_V1) Assume(m_send_buffer.empty());
1521 [ - + + + ]: 55764 : Assume(m_send_pos <= m_send_buffer.size());
1522 : 55764 : return {
1523 [ + + ]: 55764 : std::span{m_send_buffer}.subspan(m_send_pos),
1524 : : // We only have more to send after the current m_send_buffer if there is a (next)
1525 : : // message to be sent, and we're capable of sending packets. */
1526 [ + + + + ]: 55764 : have_next_message && m_send_state == SendState::READY,
1527 : 55764 : m_send_type
1528 : 55764 : };
1529 : 58207 : }
1530 : :
1531 : 10187 : void V2Transport::MarkBytesSent(size_t bytes_sent) noexcept
1532 : : {
1533 : 10187 : AssertLockNotHeld(m_send_mutex);
1534 : 10187 : LOCK(m_send_mutex);
1535 [ + + + - ]: 10187 : if (m_send_state == SendState::V1) return m_v1_fallback.MarkBytesSent(bytes_sent);
1536 : :
1537 [ + + + + : 9497 : if (m_send_state == SendState::AWAITING_KEY && m_send_pos == 0 && bytes_sent > 0) {
+ - ]
1538 [ + - ]: 124 : LogDebug(BCLog::NET, "start sending v2 handshake to peer=%d\n", m_nodeid);
1539 : : }
1540 : :
1541 : 9497 : m_send_pos += bytes_sent;
1542 [ - + + + ]: 9497 : Assume(m_send_pos <= m_send_buffer.size());
1543 [ + + ]: 9497 : if (m_send_pos >= CMessageHeader::HEADER_SIZE) {
1544 : 9375 : m_sent_v1_header_worth = true;
1545 : : }
1546 : : // Wipe the buffer when everything is sent.
1547 [ + + ]: 9497 : if (m_send_pos == m_send_buffer.size()) {
1548 : 8750 : m_send_pos = 0;
1549 : 8750 : ClearShrink(m_send_buffer);
1550 : : }
1551 : 10187 : }
1552 : :
1553 : 119 : bool V2Transport::ShouldReconnectV1() const noexcept
1554 : : {
1555 : 119 : AssertLockNotHeld(m_send_mutex);
1556 : 119 : AssertLockNotHeld(m_recv_mutex);
1557 : : // Only outgoing connections need reconnection.
1558 [ + + ]: 119 : if (!m_initiating) return false;
1559 : :
1560 : 62 : LOCK(m_recv_mutex);
1561 : : // We only reconnect in the very first state and when the receive buffer is empty. Together
1562 : : // these conditions imply nothing has been received so far.
1563 [ + + ]: 62 : if (m_recv_state != RecvState::KEY) return false;
1564 [ + - ]: 3 : if (!m_recv_buffer.empty()) return false;
1565 : : // Check if we've sent enough for the other side to disconnect us (if it was V1).
1566 : 3 : LOCK(m_send_mutex);
1567 [ + - ]: 3 : return m_sent_v1_header_worth;
1568 : 65 : }
1569 : :
1570 : 17623 : size_t V2Transport::GetSendMemoryUsage() const noexcept
1571 : : {
1572 : 17623 : AssertLockNotHeld(m_send_mutex);
1573 : 17623 : LOCK(m_send_mutex);
1574 [ + + ]: 17623 : if (m_send_state == SendState::V1) return m_v1_fallback.GetSendMemoryUsage();
1575 : :
1576 [ - + ]: 33838 : return sizeof(m_send_buffer) + memusage::DynamicUsage(m_send_buffer);
1577 : 17623 : }
1578 : :
1579 : 1903 : Transport::Info V2Transport::GetInfo() const noexcept
1580 : : {
1581 : 1903 : AssertLockNotHeld(m_recv_mutex);
1582 : 1903 : LOCK(m_recv_mutex);
1583 [ + + ]: 1903 : if (m_recv_state == RecvState::V1) return m_v1_fallback.GetInfo();
1584 : :
1585 [ + + ]: 1862 : Transport::Info info;
1586 : :
1587 : : // Do not report v2 and session ID until the version packet has been received
1588 : : // and verified (confirming that the other side very likely has the same keys as us).
1589 [ + + ]: 1862 : if (m_recv_state != RecvState::KEY_MAYBE_V1 && m_recv_state != RecvState::KEY &&
1590 : : m_recv_state != RecvState::GARB_GARBTERM && m_recv_state != RecvState::VERSION) {
1591 : 1800 : info.transport_type = TransportProtocolType::V2;
1592 : 1800 : info.session_id = uint256(MakeUCharSpan(m_cipher.GetSessionID()));
1593 : : } else {
1594 : 62 : info.transport_type = TransportProtocolType::DETECTING;
1595 : : }
1596 : :
1597 : 1862 : return info;
1598 : 1903 : }
1599 : :
1600 : 169445 : std::pair<size_t, bool> CConnman::SocketSendData(CNode& node) const
1601 : : {
1602 : 169445 : auto it = node.vSendMsg.begin();
1603 : 169445 : size_t nSentSize = 0;
1604 : 169445 : bool data_left{false}; //!< second return value (whether unsent data remains)
1605 : 169445 : std::optional<bool> expected_more;
1606 : :
1607 : 494143 : while (true) {
1608 [ + + ]: 494143 : if (it != node.vSendMsg.end()) {
1609 : : // If possible, move one message from the send queue to the transport. This fails when
1610 : : // there is an existing message still being sent, or (for v2 transports) when the
1611 : : // handshake has not yet completed.
1612 : 169786 : size_t memusage = it->GetMemoryUsage();
1613 [ + + ]: 169786 : if (node.m_transport->SetMessageToSend(*it)) {
1614 : : // Update memory usage of send buffer (as *it will be deleted).
1615 : 169204 : node.m_send_memusage -= memusage;
1616 : 169204 : ++it;
1617 : : }
1618 : : }
1619 [ + + ]: 494143 : const auto& [data, more, msg_type] = node.m_transport->GetBytesToSend(it != node.vSendMsg.end());
1620 : : // We rely on the 'more' value returned by GetBytesToSend to correctly predict whether more
1621 : : // bytes are still to be sent, to correctly set the MSG_MORE flag. As a sanity check,
1622 : : // verify that the previously returned 'more' was correct.
1623 [ + + ]: 494143 : if (expected_more.has_value()) Assume(!data.empty() == *expected_more);
1624 [ + + ]: 494143 : expected_more = more;
1625 [ + + ]: 494143 : data_left = !data.empty(); // will be overwritten on next loop if all of data gets sent
1626 : 494143 : int nBytes = 0;
1627 [ + + ]: 494143 : if (!data.empty()) {
1628 : 325222 : LOCK(node.m_sock_mutex);
1629 : : // There is no socket in case we've already disconnected, or in test cases without
1630 : : // real connections. In these cases, we bail out immediately and just leave things
1631 : : // in the send queue and transport.
1632 [ + + ]: 325222 : if (!node.m_sock) {
1633 : : break;
1634 : : }
1635 : 325210 : int flags = MSG_NOSIGNAL | MSG_DONTWAIT;
1636 : : #ifdef MSG_MORE
1637 [ + + ]: 325210 : if (more) {
1638 : 155777 : flags |= MSG_MORE;
1639 : : }
1640 : : #endif
1641 [ + - + - ]: 325210 : nBytes = node.m_sock->Send(data.data(), data.size(), flags);
1642 : 12 : }
1643 [ + - ]: 325210 : if (nBytes > 0) {
1644 : 325210 : node.m_last_send = GetTime<std::chrono::seconds>();
1645 : 325210 : node.nSendBytes += nBytes;
1646 : : // Notify transport that bytes have been processed.
1647 : 325210 : node.m_transport->MarkBytesSent(nBytes);
1648 : : // Update statistics per message type.
1649 [ + + ]: 325210 : if (!msg_type.empty()) { // don't report v2 handshake bytes for now
1650 : 324959 : node.AccountForSentBytes(msg_type, nBytes);
1651 : : }
1652 : 325210 : nSentSize += nBytes;
1653 [ + + ]: 325210 : if ((size_t)nBytes != data.size()) {
1654 : : // could not send full message; stop sending more
1655 : : break;
1656 : : }
1657 : : } else {
1658 [ - + ]: 168921 : if (nBytes < 0) {
1659 : : // error
1660 : 0 : int nErr = WSAGetLastError();
1661 [ # # # # ]: 0 : if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS) {
1662 [ # # # # : 0 : LogDebug(BCLog::NET, "socket send error, %s: %s", node.DisconnectMsg(), NetworkErrorString(nErr));
# # ]
1663 : 0 : node.CloseSocketDisconnect();
1664 : : }
1665 : : }
1666 : : break;
1667 : : }
1668 : : }
1669 : :
1670 [ + + ]: 169445 : node.fPauseSend = node.m_send_memusage + node.m_transport->GetSendMemoryUsage() > nSendBufferMaxSize;
1671 : :
1672 [ + + ]: 169445 : if (it == node.vSendMsg.end()) {
1673 [ - + ]: 169414 : assert(node.m_send_memusage == 0);
1674 : : }
1675 : 169445 : node.vSendMsg.erase(node.vSendMsg.begin(), it);
1676 : 169445 : return {nSentSize, data_left};
1677 : : }
1678 : :
1679 : : /** Try to find a connection to evict when the node is full.
1680 : : * Extreme care must be taken to avoid opening the node to attacker
1681 : : * triggered network partitioning.
1682 : : * The strategy used here is to protect a small number of peers
1683 : : * for each of several distinct characteristics which are difficult
1684 : : * to forge. In order to partition a node the attacker must be
1685 : : * simultaneously better at all of them than honest peers.
1686 : : */
1687 : 1 : bool CConnman::AttemptToEvictConnection()
1688 : : {
1689 : 1 : std::vector<NodeEvictionCandidate> vEvictionCandidates;
1690 : 1 : {
1691 : :
1692 [ + - ]: 1 : LOCK(m_nodes_mutex);
1693 [ + + ]: 22 : for (const CNode* node : m_nodes) {
1694 [ - + ]: 21 : if (node->fDisconnect)
1695 : 0 : continue;
1696 : 21 : NodeEvictionCandidate candidate{
1697 : 21 : .id = node->GetId(),
1698 : : .m_connected = node->m_connected,
1699 : 21 : .m_min_ping_time = node->m_min_ping_time,
1700 : 21 : .m_last_block_time = node->m_last_block_time,
1701 : 21 : .m_last_tx_time = node->m_last_tx_time,
1702 [ + - ]: 21 : .fRelevantServices = node->m_has_all_wanted_services,
1703 : 21 : .m_relay_txs = node->m_relays_txs.load(),
1704 : 21 : .fBloomFilter = node->m_bloom_filter_loaded.load(),
1705 : 21 : .nKeyedNetGroup = node->nKeyedNetGroup,
1706 : 21 : .prefer_evict = node->m_prefer_evict,
1707 [ + - ]: 21 : .m_is_local = node->addr.IsLocal(),
1708 : 21 : .m_network = node->ConnectedThroughNetwork(),
1709 : 21 : .m_noban = node->HasPermission(NetPermissionFlags::NoBan),
1710 : 21 : .m_conn_type = node->m_conn_type,
1711 [ + - + - : 42 : };
+ - ]
1712 [ + - ]: 21 : vEvictionCandidates.push_back(candidate);
1713 : : }
1714 : 0 : }
1715 [ + - ]: 1 : const std::optional<NodeId> node_id_to_evict = SelectNodeToEvict(std::move(vEvictionCandidates));
1716 [ + - ]: 1 : if (!node_id_to_evict) {
1717 : : return false;
1718 : : }
1719 [ + - ]: 1 : LOCK(m_nodes_mutex);
1720 [ + - ]: 9 : for (CNode* pnode : m_nodes) {
1721 [ + + ]: 9 : if (pnode->GetId() == *node_id_to_evict) {
1722 [ + - + - : 3 : LogDebug(BCLog::NET, "selected %s connection for eviction, %s", pnode->ConnectionTypeAsString(), pnode->DisconnectMsg());
+ - + - ]
1723 : : TRACEPOINT(net, evicted_inbound_connection,
1724 : : pnode->GetId(),
1725 : : pnode->m_addr_name.c_str(),
1726 : : pnode->ConnectionTypeAsString().c_str(),
1727 : : pnode->ConnectedThroughNetwork(),
1728 : 1 : Ticks<std::chrono::seconds>(pnode->m_connected));
1729 : 1 : pnode->fDisconnect = true;
1730 : 1 : return true;
1731 : : }
1732 : : }
1733 : : return false;
1734 : 2 : }
1735 : :
1736 : 1055 : void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
1737 : 1055 : struct sockaddr_storage sockaddr;
1738 : 1055 : socklen_t len = sizeof(sockaddr);
1739 : 2110 : auto sock = hListenSocket.sock->Accept((struct sockaddr*)&sockaddr, &len);
1740 : :
1741 [ - + ]: 1055 : if (!sock) {
1742 : 0 : const int nErr = WSAGetLastError();
1743 [ # # ]: 0 : if (nErr != WSAEWOULDBLOCK) {
1744 [ # # # # ]: 0 : LogInfo("socket error accept failed: %s\n", NetworkErrorString(nErr));
1745 : : }
1746 : 0 : return;
1747 : : }
1748 : :
1749 [ + - ]: 1055 : CService addr;
1750 [ + - - + ]: 1055 : if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr, len)) {
1751 [ # # ]: 0 : LogWarning("Unknown socket family\n");
1752 : : } else {
1753 [ + - ]: 2110 : addr = MaybeFlipIPv6toCJDNS(addr);
1754 : : }
1755 : :
1756 [ + - + - ]: 1055 : const CService addr_bind{MaybeFlipIPv6toCJDNS(GetBindAddress(*sock))};
1757 : :
1758 : 1055 : NetPermissionFlags permission_flags = NetPermissionFlags::None;
1759 [ + - ]: 1055 : hListenSocket.AddSocketPermissionFlags(permission_flags);
1760 : :
1761 [ + - ]: 1055 : CreateNodeFromAcceptedSocket(std::move(sock), permission_flags, addr_bind, addr);
1762 : 1055 : }
1763 : :
1764 : 1055 : void CConnman::CreateNodeFromAcceptedSocket(std::unique_ptr<Sock>&& sock,
1765 : : NetPermissionFlags permission_flags,
1766 : : const CService& addr_bind,
1767 : : const CService& addr)
1768 : : {
1769 : 1055 : int nInbound = 0;
1770 : :
1771 [ + + ]: 1055 : const bool inbound_onion = std::find(m_onion_binds.begin(), m_onion_binds.end(), addr_bind) != m_onion_binds.end();
1772 : :
1773 : : // Tor inbound connections do not reveal the peer's actual network address.
1774 : : // Therefore do not apply address-based whitelist permissions to them.
1775 [ + + + - ]: 2097 : AddWhitelistPermissionFlags(permission_flags, inbound_onion ? std::optional<CNetAddr>{} : addr, vWhitelistedRangeIncoming);
1776 : :
1777 : 1055 : {
1778 : 1055 : LOCK(m_nodes_mutex);
1779 [ + + ]: 4972 : for (const CNode* pnode : m_nodes) {
1780 [ + + ]: 3917 : if (pnode->IsInboundConn()) nInbound++;
1781 : : }
1782 : 1055 : }
1783 : :
1784 [ - + ]: 1055 : if (!fNetworkActive) {
1785 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s dropped: not accepting new connections\n", addr.ToStringAddrPort());
1786 : 0 : return;
1787 : : }
1788 : :
1789 [ - + ]: 1055 : if (!sock->IsSelectable()) {
1790 [ # # ]: 0 : LogInfo("connection from %s dropped: non-selectable socket\n", addr.ToStringAddrPort());
1791 : 0 : return;
1792 : : }
1793 : :
1794 : : // According to the internet TCP_NODELAY is not carried into accepted sockets
1795 : : // on all platforms. Set it again here just to be sure.
1796 : 1055 : const int on{1};
1797 [ - + ]: 1055 : if (sock->SetSockOpt(IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) == SOCKET_ERROR) {
1798 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s: unable to set TCP_NODELAY, continuing anyway\n",
1799 : : addr.ToStringAddrPort());
1800 : : }
1801 : :
1802 : : // Don't accept connections from banned peers.
1803 [ + - + + ]: 1055 : bool banned = m_banman && m_banman->IsBanned(addr);
1804 [ + + + + ]: 1055 : if (!NetPermissions::HasFlag(permission_flags, NetPermissionFlags::NoBan) && banned)
1805 : : {
1806 [ + - + - ]: 6 : LogDebug(BCLog::NET, "connection from %s dropped (banned)\n", addr.ToStringAddrPort());
1807 : 3 : return;
1808 : : }
1809 : :
1810 : : // Only accept connections from discouraged peers if our inbound slots aren't (almost) full.
1811 [ + - + - ]: 1052 : bool discouraged = m_banman && m_banman->IsDiscouraged(addr);
1812 [ + + + + : 1052 : if (!NetPermissions::HasFlag(permission_flags, NetPermissionFlags::NoBan) && nInbound + 1 >= m_max_inbound && discouraged)
+ - ]
1813 : : {
1814 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s dropped (discouraged)\n", addr.ToStringAddrPort());
1815 : 0 : return;
1816 : : }
1817 : :
1818 [ + + ]: 1052 : if (nInbound >= m_max_inbound)
1819 : : {
1820 [ - + ]: 1 : if (!AttemptToEvictConnection()) {
1821 : : // No connection to evict, disconnect the new connection
1822 [ # # ]: 0 : LogDebug(BCLog::NET, "failed to find an eviction candidate - connection dropped (full)\n");
1823 : 0 : return;
1824 : : }
1825 : : }
1826 : :
1827 : 1052 : NodeId id = GetNewNodeId();
1828 : 1052 : uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
1829 : :
1830 : : // The V2Transport transparently falls back to V1 behavior when an incoming V1 connection is
1831 : : // detected, so use it whenever we signal NODE_P2P_V2.
1832 : 1052 : ServiceFlags local_services = GetLocalServices();
1833 : 1052 : const bool use_v2transport(local_services & NODE_P2P_V2);
1834 : :
1835 : 1052 : uint64_t network_id = GetDeterministicRandomizer(RANDOMIZER_ID_NETWORKKEY)
1836 [ + + ]: 1052 : .Write(inbound_onion ? NET_ONION : addr.GetNetClass())
1837 [ - + + - ]: 1052 : .Write(addr_bind.GetAddrBytes())
1838 [ + - + - ]: 1052 : .Write(addr_bind.GetPort()) // inbound connections use bind port
1839 [ + - ]: 1052 : .Finalize();
1840 : 1052 : CNode* pnode = new CNode(id,
1841 : 1052 : std::move(sock),
1842 [ + - ]: 2104 : CAddress{addr, NODE_NONE},
1843 : : CalculateKeyedNetGroup(addr),
1844 : : nonce,
1845 : : addr_bind,
1846 : 1052 : /*addrNameIn=*/"",
1847 : : ConnectionType::INBOUND,
1848 : : inbound_onion,
1849 : : network_id,
1850 : 0 : CNodeOptions{
1851 : : .permission_flags = permission_flags,
1852 : : .prefer_evict = discouraged,
1853 : 1052 : .recv_flood_size = nReceiveFloodSize,
1854 : : .use_v2transport = use_v2transport,
1855 [ + - + - : 2104 : });
+ - + - ]
1856 : 1052 : pnode->AddRef();
1857 : 1052 : m_msgproc->InitializeNode(*pnode, local_services);
1858 : 1052 : {
1859 : 1052 : LOCK(m_nodes_mutex);
1860 [ + - ]: 1052 : m_nodes.push_back(pnode);
1861 : 0 : }
1862 [ + - + - ]: 2104 : LogDebug(BCLog::NET, "connection from %s accepted\n", addr.ToStringAddrPort());
1863 : : TRACEPOINT(net, inbound_connection,
1864 : : pnode->GetId(),
1865 : : pnode->m_addr_name.c_str(),
1866 : : pnode->ConnectionTypeAsString().c_str(),
1867 : : pnode->ConnectedThroughNetwork(),
1868 : 1052 : GetNodeCount(ConnectionDirection::In));
1869 : :
1870 : : // We received a new connection, harvest entropy from the time (and our peer count)
1871 : 1052 : RandAddEvent((uint32_t)id);
1872 : : }
1873 : :
1874 : 150 : bool CConnman::AddConnection(const std::string& address, ConnectionType conn_type, bool use_v2transport = false)
1875 : : {
1876 : 150 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
1877 : 150 : std::optional<int> max_connections;
1878 [ + + + - ]: 150 : switch (conn_type) {
1879 : : case ConnectionType::INBOUND:
1880 : : case ConnectionType::MANUAL:
1881 : : case ConnectionType::PRIVATE_BROADCAST:
1882 : : return false;
1883 : 96 : case ConnectionType::OUTBOUND_FULL_RELAY:
1884 : 96 : max_connections = m_max_outbound_full_relay;
1885 : 96 : break;
1886 : 35 : case ConnectionType::BLOCK_RELAY:
1887 : 35 : max_connections = m_max_outbound_block_relay;
1888 : 35 : break;
1889 : : // no limit for ADDR_FETCH because -seednode has no limit either
1890 : : case ConnectionType::ADDR_FETCH:
1891 : : break;
1892 : : // no limit for FEELER connections since they're short-lived
1893 : : case ConnectionType::FEELER:
1894 : : break;
1895 : : } // no default case, so the compiler can warn about missing cases
1896 : :
1897 : : // Count existing connections
1898 [ + + + - ]: 589 : int existing_connections = WITH_LOCK(m_nodes_mutex,
1899 : : return std::count_if(m_nodes.begin(), m_nodes.end(), [conn_type](CNode* node) { return node->m_conn_type == conn_type; }););
1900 : :
1901 : : // Max connections of specified type already exist
1902 [ + + ]: 300 : if (max_connections != std::nullopt && existing_connections >= max_connections) return false;
1903 : :
1904 : : // Max total outbound connections already exist
1905 : 300 : CountingSemaphoreGrant<> grant(*semOutbound, true);
1906 [ + - ]: 150 : if (!grant) return false;
1907 : :
1908 [ + - + - : 300 : OpenNetworkConnection(CAddress(), false, std::move(grant), address.c_str(), conn_type, /*use_v2transport=*/use_v2transport);
- + ]
1909 : 150 : return true;
1910 : : }
1911 : :
1912 : 445413 : void CConnman::DisconnectNodes()
1913 : : {
1914 : 445413 : AssertLockNotHeld(m_nodes_mutex);
1915 : 445413 : AssertLockNotHeld(m_reconnections_mutex);
1916 : :
1917 : : // Use a temporary variable to accumulate desired reconnections, so we don't need
1918 : : // m_reconnections_mutex while holding m_nodes_mutex.
1919 [ + - ]: 445413 : decltype(m_reconnections) reconnections_to_add;
1920 : :
1921 : 445413 : {
1922 [ + - ]: 445413 : LOCK(m_nodes_mutex);
1923 : :
1924 [ + + ]: 445413 : const bool network_active{fNetworkActive};
1925 [ + + ]: 445413 : if (!network_active) {
1926 : : // Disconnect any connected nodes
1927 [ + + ]: 146 : for (CNode* pnode : m_nodes) {
1928 [ + - ]: 7 : if (!pnode->fDisconnect) {
1929 [ + - + - : 14 : LogDebug(BCLog::NET, "Network not active, %s", pnode->DisconnectMsg());
+ - + - ]
1930 : 7 : pnode->fDisconnect = true;
1931 : : }
1932 : : }
1933 : : }
1934 : :
1935 : : // Disconnect unused nodes
1936 [ + - ]: 445413 : std::vector<CNode*> nodes_copy = m_nodes;
1937 [ + + ]: 1194064 : for (CNode* pnode : nodes_copy)
1938 : : {
1939 [ + + ]: 748651 : if (pnode->fDisconnect)
1940 : : {
1941 : : // remove from m_nodes
1942 : 913 : m_nodes.erase(remove(m_nodes.begin(), m_nodes.end(), pnode), m_nodes.end());
1943 : :
1944 : : // Add to reconnection list if appropriate. We don't reconnect right here, because
1945 : : // the creation of a connection is a blocking operation (up to several seconds),
1946 : : // and we don't want to hold up the socket handler thread for that long.
1947 [ + + + + ]: 913 : if (network_active && pnode->m_transport->ShouldReconnectV1()) {
1948 : 3 : reconnections_to_add.push_back({
1949 : 3 : .addr_connect = pnode->addr,
1950 [ - + ]: 3 : .grant = std::move(pnode->grantOutbound),
1951 : 3 : .destination = pnode->m_dest,
1952 : 3 : .conn_type = pnode->m_conn_type,
1953 : : .use_v2transport = false});
1954 [ + - + - : 3 : LogDebug(BCLog::NET, "retrying with v1 transport protocol for peer=%d\n", pnode->GetId());
+ - ]
1955 : : }
1956 : :
1957 : : // release outbound grant (if any)
1958 : 913 : pnode->grantOutbound.Release();
1959 : :
1960 : : // close socket and cleanup
1961 [ + - ]: 913 : pnode->CloseSocketDisconnect();
1962 : :
1963 : : // update connection count by network
1964 [ + + + - ]: 913 : if (pnode->IsManualOrFullOutboundConn()) --m_network_conn_counts[pnode->addr.GetNetwork()];
1965 : :
1966 : : // hold in disconnected pool until all refs are released
1967 [ + - ]: 913 : pnode->Release();
1968 [ + - ]: 913 : m_nodes_disconnected.push_back(pnode);
1969 : : }
1970 : : }
1971 [ + - ]: 445413 : }
1972 : 445413 : {
1973 : : // Delete disconnected nodes
1974 [ + - ]: 445413 : std::list<CNode*> nodes_disconnected_copy = m_nodes_disconnected;
1975 [ + + ]: 446534 : for (CNode* pnode : nodes_disconnected_copy)
1976 : : {
1977 : : // Destroy the object only after other threads have stopped using it.
1978 [ + + ]: 1121 : if (pnode->GetRefCount() <= 0) {
1979 : 913 : m_nodes_disconnected.remove(pnode);
1980 [ + - ]: 913 : DeleteNode(pnode);
1981 : : }
1982 : : }
1983 : 0 : }
1984 : 445413 : {
1985 : : // Move entries from reconnections_to_add to m_reconnections.
1986 [ + - ]: 445413 : LOCK(m_reconnections_mutex);
1987 [ + - ]: 445413 : m_reconnections.splice(m_reconnections.end(), std::move(reconnections_to_add));
1988 : 445413 : }
1989 [ - + + - : 445419 : }
- - ]
1990 : :
1991 : 445413 : void CConnman::NotifyNumConnectionsChanged()
1992 : : {
1993 : 445413 : size_t nodes_size;
1994 : 445413 : {
1995 : 445413 : LOCK(m_nodes_mutex);
1996 [ - + + - ]: 445413 : nodes_size = m_nodes.size();
1997 : 445413 : }
1998 [ + + ]: 445413 : if(nodes_size != nPrevNodeCount) {
1999 : 2426 : nPrevNodeCount = nodes_size;
2000 [ + - ]: 2426 : if (m_client_interface) {
2001 : 2426 : m_client_interface->NotifyNumConnectionsChanged(nodes_size);
2002 : : }
2003 : : }
2004 : 445413 : }
2005 : :
2006 : 1174560 : bool CConnman::ShouldRunInactivityChecks(const CNode& node, std::chrono::microseconds now) const
2007 : : {
2008 : 1174560 : return node.m_connected + m_peer_connect_timeout < now;
2009 : : }
2010 : :
2011 : 746977 : bool CConnman::InactivityCheck(const CNode& node, std::chrono::microseconds now) const
2012 : : {
2013 : : // Tests that see disconnects after using mocktime can start nodes with a
2014 : : // large timeout. For example, -peertimeout=999999999.
2015 : 746977 : const auto last_send{node.m_last_send.load()};
2016 : 746977 : const auto last_recv{node.m_last_recv.load()};
2017 : :
2018 [ + + ]: 746977 : if (!ShouldRunInactivityChecks(node, now)) return false;
2019 : :
2020 [ + + ]: 92 : bool has_received{last_recv.count() != 0};
2021 : 92 : bool has_sent{last_send.count() != 0};
2022 : :
2023 [ + + ]: 92 : if (!has_received || !has_sent) {
2024 [ + + ]: 3 : std::string has_never;
2025 [ + + + - ]: 3 : if (!has_received) has_never += ", never received from peer";
2026 [ + - + - ]: 3 : if (!has_sent) has_never += ", never sent to peer";
2027 [ + - + - : 6 : LogDebug(BCLog::NET,
+ - + - ]
2028 : : "socket no message in first %i seconds%s, %s",
2029 : : count_seconds(m_peer_connect_timeout),
2030 : : has_never,
2031 : : node.DisconnectMsg()
2032 : : );
2033 : 3 : return true;
2034 : 3 : }
2035 : :
2036 [ - + ]: 89 : if (now > last_send + TIMEOUT_INTERVAL) {
2037 [ # # # # ]: 0 : LogDebug(BCLog::NET,
2038 : : "socket sending timeout: %is, %s", Ticks<std::chrono::seconds>(now - last_send),
2039 : : node.DisconnectMsg()
2040 : : );
2041 : 0 : return true;
2042 : : }
2043 : :
2044 [ - + ]: 89 : if (now > last_recv + TIMEOUT_INTERVAL) {
2045 [ # # # # ]: 0 : LogDebug(BCLog::NET,
2046 : : "socket receive timeout: %is, %s", Ticks<std::chrono::seconds>(now - last_recv),
2047 : : node.DisconnectMsg()
2048 : : );
2049 : 0 : return true;
2050 : : }
2051 : :
2052 [ + + ]: 89 : if (!node.fSuccessfullyConnected) {
2053 [ + + ]: 8 : if (node.m_transport->GetInfo().transport_type == TransportProtocolType::DETECTING) {
2054 [ + - + - ]: 4 : LogDebug(BCLog::NET, "V2 handshake timeout, %s", node.DisconnectMsg());
2055 : : } else {
2056 [ + - + - ]: 12 : LogDebug(BCLog::NET, "version handshake timeout, %s", node.DisconnectMsg());
2057 : : }
2058 : 8 : return true;
2059 : : }
2060 : :
2061 : : return false;
2062 : : }
2063 : :
2064 : 445413 : Sock::EventsPerSock CConnman::GenerateWaitSockets(std::span<CNode* const> nodes)
2065 : : {
2066 : 445413 : Sock::EventsPerSock events_per_sock;
2067 : :
2068 [ + + ]: 892644 : for (const ListenSocket& hListenSocket : vhListenSocket) {
2069 [ + - ]: 447231 : events_per_sock.emplace(hListenSocket.sock, Sock::Events{Sock::RECV});
2070 : : }
2071 : :
2072 [ + + ]: 1193151 : for (CNode* pnode : nodes) {
2073 [ + - ]: 747738 : bool select_recv = !pnode->fPauseRecv;
2074 : 747738 : bool select_send;
2075 : 747738 : {
2076 [ + - ]: 747738 : LOCK(pnode->cs_vSend);
2077 : : // Sending is possible if either there are bytes to send right now, or if there will be
2078 : : // once a potential message from vSendMsg is handed to the transport. GetBytesToSend
2079 : : // determines both of these in a single call.
2080 [ + + ]: 747738 : const auto& [to_send, more, _msg_type] = pnode->m_transport->GetBytesToSend(!pnode->vSendMsg.empty());
2081 [ + + + - : 1493475 : select_send = !to_send.empty() || more;
+ - ]
2082 : 747738 : }
2083 [ + + ]: 747738 : if (!select_recv && !select_send) continue;
2084 : :
2085 [ + - ]: 746077 : LOCK(pnode->m_sock_mutex);
2086 [ + - ]: 746077 : if (pnode->m_sock) {
2087 [ + + - + ]: 1490153 : Sock::Event event = (select_send ? Sock::SEND : 0) | (select_recv ? Sock::RECV : 0);
2088 [ + - ]: 746077 : events_per_sock.emplace(pnode->m_sock, Sock::Events{event});
2089 : : }
2090 : 746077 : }
2091 : :
2092 : 445413 : return events_per_sock;
2093 : 0 : }
2094 : :
2095 : 445413 : void CConnman::SocketHandler()
2096 : : {
2097 : 445413 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2098 : :
2099 [ + - ]: 445413 : Sock::EventsPerSock events_per_sock;
2100 : :
2101 : 445413 : {
2102 [ + - ]: 445413 : const NodesSnapshot snap{*this, /*shuffle=*/false};
2103 : :
2104 : 445413 : const auto timeout = std::chrono::milliseconds(SELECT_TIMEOUT_MILLISECONDS);
2105 : :
2106 : : // Check for the readiness of the already connected sockets and the
2107 : : // listening sockets in one call ("readiness" as in poll(2) or
2108 : : // select(2)). If none are ready, wait for a short while and return
2109 : : // empty sets.
2110 [ - + + - ]: 890826 : events_per_sock = GenerateWaitSockets(snap.Nodes());
2111 [ + + + - : 445413 : if (events_per_sock.empty() || !events_per_sock.begin()->first->WaitMany(timeout, events_per_sock)) {
- + ]
2112 [ + - ]: 38 : m_interrupt_net->sleep_for(timeout);
2113 : : }
2114 : :
2115 : : // Service (send/receive) each of the already connected nodes.
2116 [ + - ]: 445413 : SocketHandlerConnected(snap.Nodes(), events_per_sock);
2117 : 445413 : }
2118 : :
2119 : : // Accept new connections from listening sockets.
2120 [ + - ]: 445413 : SocketHandlerListening(events_per_sock);
2121 : 445413 : }
2122 : :
2123 : 445413 : void CConnman::SocketHandlerConnected(const std::vector<CNode*>& nodes,
2124 : : const Sock::EventsPerSock& events_per_sock)
2125 : : {
2126 : 445413 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2127 : :
2128 : 445413 : auto now = GetTime<std::chrono::microseconds>();
2129 : :
2130 [ + + ]: 1192390 : for (CNode* pnode : nodes) {
2131 [ + + ]: 747394 : if (m_interrupt_net->interrupted()) {
2132 : : return;
2133 : : }
2134 : :
2135 : : //
2136 : : // Receive
2137 : : //
2138 : 746977 : bool recvSet = false;
2139 : 746977 : bool sendSet = false;
2140 : 746977 : bool errorSet = false;
2141 : 746977 : {
2142 : 746977 : LOCK(pnode->m_sock_mutex);
2143 [ - + ]: 746977 : if (!pnode->m_sock) {
2144 [ # # ]: 0 : continue;
2145 : : }
2146 [ + - + - ]: 1493954 : const auto it = events_per_sock.find(pnode->m_sock);
2147 [ + + + - ]: 1492293 : if (it != events_per_sock.end()) {
2148 : 745316 : recvSet = it->second.occurred & Sock::RECV;
2149 : 745316 : sendSet = it->second.occurred & Sock::SEND;
2150 : 745316 : errorSet = it->second.occurred & Sock::ERR;
2151 : : }
2152 : 0 : }
2153 : :
2154 [ + + ]: 746977 : if (sendSet) {
2155 : : // Send data
2156 [ + - + - ]: 2283 : auto [bytes_sent, data_left] = WITH_LOCK(pnode->cs_vSend, return SocketSendData(*pnode));
2157 [ + - ]: 761 : if (bytes_sent) {
2158 : 761 : RecordBytesSent(bytes_sent);
2159 : :
2160 : : // If both receiving and (non-optimistic) sending were possible, we first attempt
2161 : : // sending. If that succeeds, but does not fully drain the send queue, do not
2162 : : // attempt to receive. This avoids needlessly queueing data if the remote peer
2163 : : // is slow at receiving data, by means of TCP flow control. We only do this when
2164 : : // sending actually succeeded to make sure progress is always made; otherwise a
2165 : : // deadlock would be possible when both sides have data to send, but neither is
2166 : : // receiving.
2167 [ + + ]: 761 : if (data_left) recvSet = false;
2168 : : }
2169 : : }
2170 : :
2171 [ + + ]: 746977 : if (recvSet || errorSet)
2172 : : {
2173 : : // typical socket buffer is 8K-64K
2174 : 252171 : uint8_t pchBuf[0x10000];
2175 : 252171 : int nBytes = 0;
2176 : 252171 : {
2177 : 252171 : LOCK(pnode->m_sock_mutex);
2178 [ - + ]: 252171 : if (!pnode->m_sock) {
2179 [ # # ]: 0 : continue;
2180 : : }
2181 [ + - + - ]: 252171 : nBytes = pnode->m_sock->Recv(pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
2182 : 0 : }
2183 [ + + ]: 252171 : if (nBytes > 0)
2184 : : {
2185 : 251592 : bool notify = false;
2186 [ + + ]: 251592 : if (!pnode->ReceiveMsgBytes({pchBuf, (size_t)nBytes}, notify)) {
2187 [ + - + - ]: 20 : LogDebug(BCLog::NET,
2188 : : "receiving message bytes failed, %s",
2189 : : pnode->DisconnectMsg()
2190 : : );
2191 : 10 : pnode->CloseSocketDisconnect();
2192 : : }
2193 : 251592 : RecordBytesRecv(nBytes);
2194 [ + + ]: 251592 : if (notify) {
2195 : 146666 : pnode->MarkReceivedMsgsForProcessing();
2196 : 146666 : WakeMessageHandler();
2197 : : }
2198 : : }
2199 [ + + ]: 579 : else if (nBytes == 0)
2200 : : {
2201 : : // socket closed gracefully
2202 [ + - ]: 571 : if (!pnode->fDisconnect) {
2203 [ + - + - ]: 1142 : LogDebug(BCLog::NET, "socket closed, %s", pnode->DisconnectMsg());
2204 : : }
2205 : 571 : pnode->CloseSocketDisconnect();
2206 : : }
2207 [ + - ]: 8 : else if (nBytes < 0)
2208 : : {
2209 : : // error
2210 : 8 : int nErr = WSAGetLastError();
2211 [ + - + - ]: 8 : if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
2212 : : {
2213 [ + - ]: 8 : if (!pnode->fDisconnect) {
2214 [ + - + - : 16 : LogDebug(BCLog::NET, "socket recv error, %s: %s", pnode->DisconnectMsg(), NetworkErrorString(nErr));
+ - ]
2215 : : }
2216 : 8 : pnode->CloseSocketDisconnect();
2217 : : }
2218 : : }
2219 : : }
2220 : :
2221 [ + + ]: 746977 : if (InactivityCheck(*pnode, now)) pnode->fDisconnect = true;
2222 : : }
2223 : : }
2224 : :
2225 : 445413 : void CConnman::SocketHandlerListening(const Sock::EventsPerSock& events_per_sock)
2226 : : {
2227 [ + + ]: 891620 : for (const ListenSocket& listen_socket : vhListenSocket) {
2228 [ + + ]: 447215 : if (m_interrupt_net->interrupted()) {
2229 : : return;
2230 : : }
2231 [ + - + - ]: 892414 : const auto it = events_per_sock.find(listen_socket.sock);
2232 [ + - + + ]: 447262 : if (it != events_per_sock.end() && it->second.occurred & Sock::RECV) {
2233 : 1055 : AcceptConnection(listen_socket);
2234 : : }
2235 : : }
2236 : : }
2237 : :
2238 : 1023 : void CConnman::ThreadSocketHandler()
2239 : : {
2240 : 1023 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2241 : :
2242 [ + + ]: 446436 : while (!m_interrupt_net->interrupted()) {
2243 : 445413 : DisconnectNodes();
2244 : 445413 : NotifyNumConnectionsChanged();
2245 : 445413 : SocketHandler();
2246 : : }
2247 : 1023 : }
2248 : :
2249 : 243768 : void CConnman::WakeMessageHandler()
2250 : : {
2251 : 243768 : {
2252 : 243768 : LOCK(mutexMsgProc);
2253 [ + - ]: 243768 : fMsgProcWake = true;
2254 : 243768 : }
2255 : 243768 : condMsgProc.notify_one();
2256 : 243768 : }
2257 : :
2258 : 14 : void CConnman::ThreadDNSAddressSeed()
2259 : : {
2260 : 14 : int outbound_connection_count = 0;
2261 : :
2262 [ + - - + ]: 14 : if (!gArgs.GetArgs("-seednode").empty()) {
2263 : 0 : auto start = NodeClock::now();
2264 : 0 : constexpr std::chrono::seconds SEEDNODE_TIMEOUT = 30s;
2265 : 0 : LogInfo("-seednode enabled. Trying the provided seeds for %d seconds before defaulting to the dnsseeds.\n", SEEDNODE_TIMEOUT.count());
2266 [ # # ]: 0 : while (!m_interrupt_net->interrupted()) {
2267 [ # # ]: 0 : if (!m_interrupt_net->sleep_for(500ms)) {
2268 : : return;
2269 : : }
2270 : :
2271 : : // Abort if we have spent enough time without reaching our target.
2272 : : // Giving seed nodes 30 seconds so this does not become a race against fixedseeds (which triggers after 1 min)
2273 [ # # ]: 0 : if (NodeClock::now() > start + SEEDNODE_TIMEOUT) {
2274 : 0 : LogInfo("Couldn't connect to enough peers via seed nodes. Handing fetch logic to the DNS seeds.\n");
2275 : 0 : break;
2276 : : }
2277 : :
2278 : 0 : outbound_connection_count = GetFullOutboundConnCount();
2279 [ # # ]: 0 : if (outbound_connection_count >= SEED_OUTBOUND_CONNECTION_THRESHOLD) {
2280 : 0 : LogInfo("P2P peers available. Finished fetching data from seed nodes.\n");
2281 : 0 : break;
2282 : : }
2283 : : }
2284 : : }
2285 : :
2286 : 14 : FastRandomContext rng;
2287 [ + - ]: 14 : std::vector<std::string> seeds = m_params.DNSSeeds();
2288 : 14 : std::shuffle(seeds.begin(), seeds.end(), rng);
2289 : 14 : int seeds_right_now = 0; // Number of seeds left before testing if we have enough connections
2290 : :
2291 [ + - + - : 14 : if (gArgs.GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED)) {
+ + ]
2292 : : // When -forcednsseed is provided, query all.
2293 [ - + ]: 1 : seeds_right_now = seeds.size();
2294 [ + - + + ]: 13 : } else if (addrman.get().Size() == 0) {
2295 : : // If we have no known peers, query all.
2296 : : // This will occur on the first run, or if peers.dat has been
2297 : : // deleted.
2298 [ - + ]: 8 : seeds_right_now = seeds.size();
2299 : : }
2300 : :
2301 : : // Proceed with dnsseeds if seednodes hasn't reached the target or if forcednsseed is set
2302 [ + - ]: 14 : if (outbound_connection_count < SEED_OUTBOUND_CONNECTION_THRESHOLD || seeds_right_now) {
2303 : : // goal: only query DNS seed if address need is acute
2304 : : // * If we have a reasonable number of peers in addrman, spend
2305 : : // some time trying them first. This improves user privacy by
2306 : : // creating fewer identifying DNS requests, reduces trust by
2307 : : // giving seeds less influence on the network topology, and
2308 : : // reduces traffic to the seeds.
2309 : : // * When querying DNS seeds query a few at once, this ensures
2310 : : // that we don't give DNS seeds the ability to eclipse nodes
2311 : : // that query them.
2312 : : // * If we continue having problems, eventually query all the
2313 : : // DNS seeds, and if that fails too, also try the fixed seeds.
2314 : : // (done in ThreadOpenConnections)
2315 : 14 : int found = 0;
2316 [ + - + + ]: 14 : const std::chrono::seconds seeds_wait_time = (addrman.get().Size() >= DNSSEEDS_DELAY_PEER_THRESHOLD ? DNSSEEDS_DELAY_MANY_PEERS : DNSSEEDS_DELAY_FEW_PEERS);
2317 : :
2318 [ + + ]: 24 : for (const std::string& seed : seeds) {
2319 [ + + ]: 14 : if (seeds_right_now == 0) {
2320 : 5 : seeds_right_now += DNSSEEDS_TO_QUERY_AT_ONCE;
2321 : :
2322 [ + - + - ]: 5 : if (addrman.get().Size() > 0) {
2323 [ + - ]: 5 : LogInfo("Waiting %d seconds before querying DNS seeds.\n", seeds_wait_time.count());
2324 : 5 : std::chrono::seconds to_wait = seeds_wait_time;
2325 [ + + ]: 6 : while (to_wait.count() > 0) {
2326 : : // if sleeping for the MANY_PEERS interval, wake up
2327 : : // early to see if we have enough peers and can stop
2328 : : // this thread entirely freeing up its resources
2329 : 5 : std::chrono::seconds w = std::min(DNSSEEDS_DELAY_FEW_PEERS, to_wait);
2330 [ + - + + ]: 5 : if (!m_interrupt_net->sleep_for(w)) return;
2331 [ + - ]: 2 : to_wait -= w;
2332 : :
2333 [ + - + + ]: 2 : if (GetFullOutboundConnCount() >= SEED_OUTBOUND_CONNECTION_THRESHOLD) {
2334 [ - + ]: 1 : if (found > 0) {
2335 [ # # ]: 0 : LogInfo("%d addresses found from DNS seeds\n", found);
2336 [ # # ]: 0 : LogInfo("P2P peers available. Finished DNS seeding.\n");
2337 : : } else {
2338 [ + - ]: 1 : LogInfo("P2P peers available. Skipped DNS seeding.\n");
2339 : : }
2340 : 1 : return;
2341 : : }
2342 : : }
2343 : : }
2344 : : }
2345 : :
2346 [ + - + - ]: 10 : if (m_interrupt_net->interrupted()) return;
2347 : :
2348 : : // hold off on querying seeds if P2P network deactivated
2349 [ - + ]: 10 : if (!fNetworkActive) {
2350 [ # # ]: 0 : LogInfo("Waiting for network to be reactivated before querying DNS seeds.\n");
2351 : 0 : do {
2352 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(1s)) return;
2353 [ # # ]: 0 : } while (!fNetworkActive);
2354 : : }
2355 : :
2356 [ + - ]: 10 : LogInfo("Loading addresses from DNS seed %s\n", seed);
2357 : : // If -proxy is in use, we make an ADDR_FETCH connection to the DNS resolved peer address
2358 : : // for the base dns seed domain in chainparams
2359 [ + - + + ]: 10 : if (HaveNameProxy()) {
2360 [ + - ]: 9 : AddAddrFetch(seed);
2361 : : } else {
2362 : 1 : std::vector<CAddress> vAdd;
2363 : 1 : constexpr ServiceFlags requiredServiceBits{SeedsServiceFlags()};
2364 [ + - ]: 1 : std::string host = strprintf("x%x.%s", requiredServiceBits, seed);
2365 [ + - ]: 1 : CNetAddr resolveSource;
2366 [ + - - + ]: 1 : if (!resolveSource.SetInternal(host)) {
2367 : 0 : continue;
2368 : : }
2369 : : // Limit number of IPs learned from a single DNS seed. This limit exists to prevent the results from
2370 : : // one DNS seed from dominating AddrMan. Note that the number of results from a UDP DNS query is
2371 : : // bounded to 33 already, but it is possible for it to use TCP where a larger number of results can be
2372 : : // returned.
2373 : 1 : unsigned int nMaxIPs = 32;
2374 [ + - + - ]: 1 : const auto addresses{LookupHost(host, nMaxIPs, true)};
2375 [ - + ]: 1 : if (!addresses.empty()) {
2376 [ # # ]: 0 : for (const CNetAddr& ip : addresses) {
2377 [ # # ]: 0 : CAddress addr = CAddress(CService(ip, m_params.GetDefaultPort()), requiredServiceBits);
2378 : 0 : addr.nTime = rng.rand_uniform_delay(Now<NodeSeconds>() - 3 * 24h, -4 * 24h); // use a random age between 3 and 7 days old
2379 [ # # ]: 0 : vAdd.push_back(addr);
2380 : 0 : found++;
2381 : 0 : }
2382 [ # # ]: 0 : addrman.get().Add(vAdd, resolveSource);
2383 : : } else {
2384 : : // If the seed does not support a subdomain with our desired service bits,
2385 : : // we make an ADDR_FETCH connection to the DNS resolved peer address for the
2386 : : // base dns seed domain in chainparams
2387 [ + - ]: 1 : AddAddrFetch(seed);
2388 : : }
2389 : 1 : }
2390 : 10 : --seeds_right_now;
2391 : : }
2392 [ + - ]: 10 : LogInfo("%d addresses found from DNS seeds\n", found);
2393 : : } else {
2394 [ # # ]: 0 : LogInfo("Skipping DNS seeds. Enough peers have been found\n");
2395 : : }
2396 : 14 : }
2397 : :
2398 : 1032 : void CConnman::DumpAddresses()
2399 : : {
2400 : 1032 : const auto start{SteadyClock::now()};
2401 : :
2402 : 1032 : DumpPeerAddresses(::gArgs, addrman);
2403 : :
2404 [ + - ]: 1032 : LogDebug(BCLog::NET, "Flushed %d addresses to peers.dat %dms",
2405 : : addrman.get().Size(), Ticks<std::chrono::milliseconds>(SteadyClock::now() - start));
2406 : 1032 : }
2407 : :
2408 : 59 : void CConnman::ProcessAddrFetch()
2409 : : {
2410 : 59 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2411 [ + - ]: 59 : std::string strDest;
2412 : 59 : {
2413 [ + - ]: 59 : LOCK(m_addr_fetches_mutex);
2414 [ + + ]: 59 : if (m_addr_fetches.empty())
2415 [ + - ]: 56 : return;
2416 [ + - ]: 3 : strDest = m_addr_fetches.front();
2417 [ + - ]: 3 : m_addr_fetches.pop_front();
2418 : 56 : }
2419 : : // Attempt v2 connection if we support v2 - we'll reconnect with v1 if our
2420 : : // peer doesn't support it or immediately disconnects us for another reason.
2421 [ + - ]: 3 : const bool use_v2transport(GetLocalServices() & NODE_P2P_V2);
2422 [ + - ]: 3 : CAddress addr;
2423 : 3 : CountingSemaphoreGrant<> grant(*semOutbound, /*fTry=*/true);
2424 [ + - ]: 3 : if (grant) {
2425 [ + - ]: 3 : OpenNetworkConnection(addr, false, std::move(grant), strDest.c_str(), ConnectionType::ADDR_FETCH, use_v2transport);
2426 : : }
2427 : 59 : }
2428 : :
2429 : 77 : bool CConnman::GetTryNewOutboundPeer() const
2430 : : {
2431 : 77 : return m_try_another_outbound_peer;
2432 : : }
2433 : :
2434 : 1279 : void CConnman::SetTryNewOutboundPeer(bool flag)
2435 : : {
2436 : 1279 : m_try_another_outbound_peer = flag;
2437 [ + - + + ]: 2557 : LogDebug(BCLog::NET, "setting try another outbound peer=%s\n", flag ? "true" : "false");
2438 : 1279 : }
2439 : :
2440 : 50 : void CConnman::StartExtraBlockRelayPeers()
2441 : : {
2442 [ + - ]: 50 : LogDebug(BCLog::NET, "enabling extra block-relay-only peers\n");
2443 : 50 : m_start_extra_block_relay_peers = true;
2444 : 50 : }
2445 : :
2446 : : // Return the number of outbound connections that are full relay (not blocks only)
2447 : 2 : int CConnman::GetFullOutboundConnCount() const
2448 : : {
2449 : 2 : int nRelevant = 0;
2450 : 2 : {
2451 : 2 : LOCK(m_nodes_mutex);
2452 [ + + ]: 6 : for (const CNode* pnode : m_nodes) {
2453 [ + - + + ]: 4 : if (pnode->fSuccessfullyConnected && pnode->IsFullOutboundConn()) ++nRelevant;
2454 : : }
2455 : 2 : }
2456 : 2 : return nRelevant;
2457 : : }
2458 : :
2459 : : // Return the number of peers we have over our outbound connection limit
2460 : : // Exclude peers that are marked for disconnect, or are going to be
2461 : : // disconnected soon (eg ADDR_FETCH and FEELER)
2462 : : // Also exclude peers that haven't finished initial connection handshake yet
2463 : : // (so that we don't decide we're over our desired connection limit, and then
2464 : : // evict some peer that has finished the handshake)
2465 : 194 : int CConnman::GetExtraFullOutboundCount() const
2466 : : {
2467 : 194 : int full_outbound_peers = 0;
2468 : 194 : {
2469 : 194 : LOCK(m_nodes_mutex);
2470 [ + + ]: 460 : for (const CNode* pnode : m_nodes) {
2471 [ + - + + : 266 : if (pnode->fSuccessfullyConnected && !pnode->fDisconnect && pnode->IsFullOutboundConn()) {
+ + ]
2472 : 62 : ++full_outbound_peers;
2473 : : }
2474 : : }
2475 : 194 : }
2476 [ + + ]: 194 : return std::max(full_outbound_peers - m_max_outbound_full_relay, 0);
2477 : : }
2478 : :
2479 : 194 : int CConnman::GetExtraBlockRelayCount() const
2480 : : {
2481 : 194 : int block_relay_peers = 0;
2482 : 194 : {
2483 : 194 : LOCK(m_nodes_mutex);
2484 [ + + ]: 460 : for (const CNode* pnode : m_nodes) {
2485 [ + - + + : 266 : if (pnode->fSuccessfullyConnected && !pnode->fDisconnect && pnode->IsBlockOnlyConn()) {
+ + ]
2486 : 13 : ++block_relay_peers;
2487 : : }
2488 : : }
2489 : 194 : }
2490 [ + + ]: 194 : return std::max(block_relay_peers - m_max_outbound_block_relay, 0);
2491 : : }
2492 : :
2493 : 28 : std::unordered_set<Network> CConnman::GetReachableEmptyNetworks() const
2494 : : {
2495 : 28 : std::unordered_set<Network> networks{};
2496 [ + + ]: 224 : for (int n = 0; n < NET_MAX; n++) {
2497 : 196 : enum Network net = (enum Network)n;
2498 [ + + ]: 196 : if (net == NET_UNROUTABLE || net == NET_INTERNAL) continue;
2499 [ + - + + : 140 : if (g_reachable_nets.Contains(net) && addrman.get().Size(net, std::nullopt) == 0) {
+ - + + ]
2500 [ + - ]: 17 : networks.insert(net);
2501 : : }
2502 : : }
2503 : 28 : return networks;
2504 : 0 : }
2505 : :
2506 : 38 : bool CConnman::MultipleManualOrFullOutboundConns(Network net) const
2507 : : {
2508 : 38 : AssertLockHeld(m_nodes_mutex);
2509 : 38 : return m_network_conn_counts[net] > 1;
2510 : : }
2511 : :
2512 : 0 : bool CConnman::MaybePickPreferredNetwork(std::optional<Network>& network)
2513 : : {
2514 : 0 : std::array<Network, 5> nets{NET_IPV4, NET_IPV6, NET_ONION, NET_I2P, NET_CJDNS};
2515 : 0 : std::shuffle(nets.begin(), nets.end(), FastRandomContext());
2516 : :
2517 : 0 : LOCK(m_nodes_mutex);
2518 [ # # ]: 0 : for (const auto net : nets) {
2519 [ # # # # : 0 : if (g_reachable_nets.Contains(net) && m_network_conn_counts[net] == 0 && addrman.get().Size(net) != 0) {
# # # # #
# ]
2520 : 0 : network = net;
2521 : 0 : return true;
2522 : : }
2523 : : }
2524 : :
2525 : : return false;
2526 : 0 : }
2527 : :
2528 : 36 : void CConnman::ThreadOpenConnections(const std::vector<std::string> connect, std::span<const std::string> seed_nodes)
2529 : : {
2530 : 36 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2531 : 36 : AssertLockNotHeld(m_reconnections_mutex);
2532 : 36 : FastRandomContext rng;
2533 : : // Connect to specific addresses
2534 [ + + ]: 36 : if (!connect.empty())
2535 : : {
2536 : : // Attempt v2 connection if we support v2 - we'll reconnect with v1 if our
2537 : : // peer doesn't support it or immediately disconnects us for another reason.
2538 [ + - ]: 5 : const bool use_v2transport(GetLocalServices() & NODE_P2P_V2);
2539 : 5 : for (int64_t nLoop = 0;; nLoop++)
2540 : : {
2541 [ + + ]: 12 : for (const std::string& strAddr : connect)
2542 : : {
2543 [ + - ]: 14 : CAddress addr(CService(), NODE_NONE);
2544 [ + - - + ]: 14 : OpenNetworkConnection(addr, false, {}, strAddr.c_str(), ConnectionType::MANUAL, /*use_v2transport=*/use_v2transport);
2545 [ + - - + ]: 7 : for (int i = 0; i < 10 && i < nLoop; i++)
2546 : : {
2547 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(500ms)) {
2548 : 0 : return;
2549 : : }
2550 : : }
2551 : 7 : }
2552 [ + - - + ]: 5 : if (!m_interrupt_net->sleep_for(500ms)) {
2553 : : return;
2554 : : }
2555 [ # # ]: 0 : PerformReconnections();
2556 : 0 : }
2557 : : }
2558 : :
2559 : : // Initiate network connections
2560 : 31 : auto start = GetTime<std::chrono::microseconds>();
2561 : :
2562 : : // Minimum time before next feeler connection (in microseconds).
2563 : 31 : auto next_feeler = start + rng.rand_exp_duration(FEELER_INTERVAL);
2564 : 31 : auto next_extra_block_relay = start + rng.rand_exp_duration(EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL);
2565 [ + - ]: 31 : auto next_extra_network_peer{start + rng.rand_exp_duration(EXTRA_NETWORK_PEER_INTERVAL)};
2566 [ + - + - ]: 31 : const bool dnsseed = gArgs.GetBoolArg("-dnsseed", DEFAULT_DNSSEED);
2567 [ + - + - ]: 31 : bool add_fixed_seeds = gArgs.GetBoolArg("-fixedseeds", DEFAULT_FIXEDSEEDS);
2568 [ + - + - ]: 31 : const bool use_seednodes{!gArgs.GetArgs("-seednode").empty()};
2569 : :
2570 : 31 : auto seed_node_timer = NodeClock::now();
2571 [ + - + + : 31 : bool add_addr_fetch{addrman.get().Size() == 0 && !seed_nodes.empty()};
+ + ]
2572 : 31 : constexpr std::chrono::seconds ADD_NEXT_SEEDNODE = 10s;
2573 : :
2574 [ + + ]: 31 : if (!add_fixed_seeds) {
2575 [ + - ]: 27 : LogInfo("Fixed seeds are disabled\n");
2576 : : }
2577 : :
2578 [ + - + - ]: 59 : while (!m_interrupt_net->interrupted()) {
2579 [ + + ]: 59 : if (add_addr_fetch) {
2580 : 2 : add_addr_fetch = false;
2581 : 2 : const auto& seed{SpanPopBack(seed_nodes)};
2582 [ + - ]: 2 : AddAddrFetch(seed);
2583 : :
2584 [ + - + + ]: 2 : if (addrman.get().Size() == 0) {
2585 [ + - ]: 1 : LogInfo("Empty addrman, adding seednode (%s) to addrfetch\n", seed);
2586 : : } else {
2587 [ + - ]: 1 : LogInfo("Couldn't connect to peers from addrman after %d seconds. Adding seednode (%s) to addrfetch\n", ADD_NEXT_SEEDNODE.count(), seed);
2588 : : }
2589 : : }
2590 : :
2591 [ + - ]: 59 : ProcessAddrFetch();
2592 : :
2593 [ + - + + ]: 59 : if (!m_interrupt_net->sleep_for(500ms)) {
2594 : : return;
2595 : : }
2596 : :
2597 [ + - ]: 28 : PerformReconnections();
2598 : :
2599 : 28 : CountingSemaphoreGrant<> grant(*semOutbound);
2600 [ + - + - ]: 28 : if (m_interrupt_net->interrupted()) {
2601 : : return;
2602 : : }
2603 : :
2604 [ + - ]: 28 : const std::unordered_set<Network> fixed_seed_networks{GetReachableEmptyNetworks()};
2605 [ + + + - ]: 28 : if (add_fixed_seeds && !fixed_seed_networks.empty()) {
2606 : : // When the node starts with an empty peers.dat, there are a few other sources of peers before
2607 : : // we fallback on to fixed seeds: -dnsseed, -seednode, -addnode
2608 : : // If none of those are available, we fallback on to fixed seeds immediately, else we allow
2609 : : // 60 seconds for any of those sources to populate addrman.
2610 : 3 : bool add_fixed_seeds_now = false;
2611 : : // It is cheapest to check if enough time has passed first.
2612 [ + + ]: 3 : if (GetTime<std::chrono::seconds>() > start + std::chrono::minutes{1}) {
2613 : 2 : add_fixed_seeds_now = true;
2614 [ + - ]: 2 : LogInfo("Adding fixed seeds as 60 seconds have passed and addrman is empty for at least one reachable network\n");
2615 : : }
2616 : :
2617 : : // Perform cheap checks before locking a mutex.
2618 [ + - ]: 1 : else if (!dnsseed && !use_seednodes) {
2619 [ + - ]: 1 : LOCK(m_added_nodes_mutex);
2620 [ + - ]: 1 : if (m_added_node_params.empty()) {
2621 : 1 : add_fixed_seeds_now = true;
2622 [ + - ]: 1 : LogInfo("Adding fixed seeds as -dnsseed=0 (or IPv4/IPv6 connections are disabled via -onlynet) and neither -addnode nor -seednode are provided\n");
2623 : : }
2624 : 0 : }
2625 : :
2626 [ + - ]: 1 : if (add_fixed_seeds_now) {
2627 [ + - ]: 3 : std::vector<CAddress> seed_addrs{ConvertSeeds(m_params.FixedSeeds())};
2628 : : // We will not make outgoing connections to peers that are unreachable
2629 : : // (e.g. because of -onlynet configuration).
2630 : : // Therefore, we do not add them to addrman in the first place.
2631 : : // In case previously unreachable networks become reachable
2632 : : // (e.g. in case of -onlynet changes by the user), fixed seeds will
2633 : : // be loaded only for networks for which we have no addresses.
2634 [ + - ]: 3 : seed_addrs.erase(std::remove_if(seed_addrs.begin(), seed_addrs.end(),
2635 : 0 : [&fixed_seed_networks](const CAddress& addr) { return !fixed_seed_networks.contains(addr.GetNetwork()); }),
2636 [ + - ]: 3 : seed_addrs.end());
2637 [ + - ]: 3 : CNetAddr local;
2638 [ + - + - ]: 3 : local.SetInternal("fixedseeds");
2639 [ + - ]: 3 : addrman.get().Add(seed_addrs, local);
2640 : 3 : add_fixed_seeds = false;
2641 [ - + + - ]: 3 : LogInfo("Added %d fixed seeds from reachable networks.\n", seed_addrs.size());
2642 : 3 : }
2643 : : }
2644 : :
2645 : : //
2646 : : // Choose an address to connect to based on most recently seen
2647 : : //
2648 [ + - ]: 28 : CAddress addrConnect;
2649 : :
2650 : : // Only connect out to one peer per ipv4/ipv6 network group (/16 for IPv4).
2651 : 28 : int nOutboundFullRelay = 0;
2652 : 28 : int nOutboundBlockRelay = 0;
2653 : 28 : int outbound_privacy_network_peers = 0;
2654 [ + - ]: 28 : std::set<std::vector<unsigned char>> outbound_ipv46_peer_netgroups;
2655 : :
2656 : 28 : {
2657 [ + - ]: 28 : LOCK(m_nodes_mutex);
2658 [ + + ]: 200 : for (const CNode* pnode : m_nodes) {
2659 [ + + ]: 172 : if (pnode->IsFullOutboundConn()) nOutboundFullRelay++;
2660 [ + + ]: 172 : if (pnode->IsBlockOnlyConn()) nOutboundBlockRelay++;
2661 : :
2662 : : // Make sure our persistent outbound slots to ipv4/ipv6 peers belong to different netgroups.
2663 [ + + ]: 172 : switch (pnode->m_conn_type) {
2664 : : // We currently don't take inbound connections into account. Since they are
2665 : : // free to make, an attacker could make them to prevent us from connecting to
2666 : : // certain peers.
2667 : : case ConnectionType::INBOUND:
2668 : : // Short-lived outbound connections should not affect how we select outbound
2669 : : // peers from addrman.
2670 : : case ConnectionType::ADDR_FETCH:
2671 : : case ConnectionType::FEELER:
2672 : : case ConnectionType::PRIVATE_BROADCAST:
2673 : : break;
2674 : 157 : case ConnectionType::MANUAL:
2675 : 157 : case ConnectionType::OUTBOUND_FULL_RELAY:
2676 : 157 : case ConnectionType::BLOCK_RELAY:
2677 : 314 : const CAddress address{pnode->addr};
2678 [ + - + - : 157 : if (address.IsTor() || address.IsI2P() || address.IsCJDNS()) {
+ - ]
2679 : : // Since our addrman-groups for these networks are
2680 : : // random, without relation to the route we
2681 : : // take to connect to these peers or to the
2682 : : // difficulty in obtaining addresses with diverse
2683 : : // groups, we don't worry about diversity with
2684 : : // respect to our addrman groups when connecting to
2685 : : // these networks.
2686 : 0 : ++outbound_privacy_network_peers;
2687 : : } else {
2688 [ + - + - ]: 314 : outbound_ipv46_peer_netgroups.insert(m_netgroupman.GetGroup(address));
2689 : : }
2690 : : } // no default case, so the compiler can warn about missing cases
2691 : : }
2692 : 0 : }
2693 : :
2694 [ + + + - ]: 28 : if (!seed_nodes.empty() && nOutboundFullRelay < SEED_OUTBOUND_CONNECTION_THRESHOLD) {
2695 [ + + ]: 2 : if (NodeClock::now() > seed_node_timer + ADD_NEXT_SEEDNODE) {
2696 : 1 : seed_node_timer = NodeClock::now();
2697 : 1 : add_addr_fetch = true;
2698 : : }
2699 : : }
2700 : :
2701 : 28 : ConnectionType conn_type = ConnectionType::OUTBOUND_FULL_RELAY;
2702 : 28 : auto now = GetTime<std::chrono::microseconds>();
2703 : 28 : bool anchor = false;
2704 : 28 : bool fFeeler = false;
2705 : 28 : std::optional<Network> preferred_net;
2706 : :
2707 : : // Determine what type of connection to open. Opening
2708 : : // BLOCK_RELAY connections to addresses from anchors.dat gets the highest
2709 : : // priority. Then we open OUTBOUND_FULL_RELAY priority until we
2710 : : // meet our full-relay capacity. Then we open BLOCK_RELAY connection
2711 : : // until we hit our block-relay-only peer limit.
2712 : : // GetTryNewOutboundPeer() gets set when a stale tip is detected, so we
2713 : : // try opening an additional OUTBOUND_FULL_RELAY connection. If none of
2714 : : // these conditions are met, check to see if it's time to try an extra
2715 : : // block-relay-only peer (to confirm our tip is current, see below) or the next_feeler
2716 : : // timer to decide if we should open a FEELER.
2717 : :
2718 [ + + - + ]: 28 : if (!m_anchors.empty() && (nOutboundBlockRelay < m_max_outbound_block_relay)) {
2719 : : conn_type = ConnectionType::BLOCK_RELAY;
2720 : : anchor = true;
2721 [ + + ]: 27 : } else if (nOutboundFullRelay < m_max_outbound_full_relay) {
2722 : : // OUTBOUND_FULL_RELAY
2723 [ + + ]: 13 : } else if (nOutboundBlockRelay < m_max_outbound_block_relay) {
2724 : : conn_type = ConnectionType::BLOCK_RELAY;
2725 [ + - + - ]: 11 : } else if (GetTryNewOutboundPeer()) {
2726 : : // OUTBOUND_FULL_RELAY
2727 [ - + - - ]: 11 : } else if (now > next_extra_block_relay && m_start_extra_block_relay_peers) {
2728 : : // Periodically connect to a peer (using regular outbound selection
2729 : : // methodology from addrman) and stay connected long enough to sync
2730 : : // headers, but not much else.
2731 : : //
2732 : : // Then disconnect the peer, if we haven't learned anything new.
2733 : : //
2734 : : // The idea is to make eclipse attacks very difficult to pull off,
2735 : : // because every few minutes we're finding a new peer to learn headers
2736 : : // from.
2737 : : //
2738 : : // This is similar to the logic for trying extra outbound (full-relay)
2739 : : // peers, except:
2740 : : // - we do this all the time on an exponential timer, rather than just when
2741 : : // our tip is stale
2742 : : // - we potentially disconnect our next-youngest block-relay-only peer, if our
2743 : : // newest block-relay-only peer delivers a block more recently.
2744 : : // See the eviction logic in net_processing.cpp.
2745 : : //
2746 : : // Because we can promote these connections to block-relay-only
2747 : : // connections, they do not get their own ConnectionType enum
2748 : : // (similar to how we deal with extra outbound peers).
2749 : 0 : next_extra_block_relay = now + rng.rand_exp_duration(EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL);
2750 : 0 : conn_type = ConnectionType::BLOCK_RELAY;
2751 [ - + ]: 11 : } else if (now > next_feeler) {
2752 : 0 : next_feeler = now + rng.rand_exp_duration(FEELER_INTERVAL);
2753 : 0 : conn_type = ConnectionType::FEELER;
2754 : 0 : fFeeler = true;
2755 [ + - ]: 11 : } else if (nOutboundFullRelay == m_max_outbound_full_relay &&
2756 [ - + ]: 11 : m_max_outbound_full_relay == MAX_OUTBOUND_FULL_RELAY_CONNECTIONS &&
2757 [ + - - + : 22 : now > next_extra_network_peer &&
- - ]
2758 [ # # ]: 0 : MaybePickPreferredNetwork(preferred_net)) {
2759 : : // Full outbound connection management: Attempt to get at least one
2760 : : // outbound peer from each reachable network by making extra connections
2761 : : // and then protecting "only" peers from a network during outbound eviction.
2762 : : // This is not attempted if the user changed -maxconnections to a value
2763 : : // so low that less than MAX_OUTBOUND_FULL_RELAY_CONNECTIONS are made,
2764 : : // to prevent interactions with otherwise protected outbound peers.
2765 : 0 : next_extra_network_peer = now + rng.rand_exp_duration(EXTRA_NETWORK_PEER_INTERVAL);
2766 : : } else {
2767 : : // skip to next iteration of while loop
2768 : 11 : continue;
2769 : : }
2770 : :
2771 [ + - ]: 17 : addrman.get().ResolveCollisions();
2772 : :
2773 : 17 : const auto current_time{NodeClock::now()};
2774 : 17 : int nTries = 0;
2775 [ + - ]: 17 : const auto reachable_nets{g_reachable_nets.All()};
2776 : :
2777 [ + - + - ]: 123 : while (!m_interrupt_net->interrupted()) {
2778 [ + + - + ]: 123 : if (anchor && !m_anchors.empty()) {
2779 : 1 : const CAddress addr = m_anchors.back();
2780 : 1 : m_anchors.pop_back();
2781 [ + - + - : 4 : if (!addr.IsValid() || IsLocal(addr) || !g_reachable_nets.Contains(addr) ||
+ - + - +
- + - -
+ ]
2782 [ + - + - : 3 : !m_msgproc->HasAllDesirableServiceFlags(addr.nServices) ||
+ - ]
2783 [ + - ]: 2 : outbound_ipv46_peer_netgroups.contains(m_netgroupman.GetGroup(addr))) continue;
2784 : 1 : addrConnect = addr;
2785 [ + - + - : 2 : LogDebug(BCLog::NET, "Trying to make an anchor connection to %s\n", addrConnect.ToStringAddrPort());
+ - + - ]
2786 : 1 : break;
2787 : 1 : }
2788 : :
2789 : : // If we didn't find an appropriate destination after trying 100 addresses fetched from addrman,
2790 : : // stop this loop, and let the outer loop run again (which sleeps, adds seed nodes, recalculates
2791 : : // already-connected network ranges, ...) before trying new addrman addresses.
2792 : 122 : nTries++;
2793 [ + + ]: 122 : if (nTries > 100)
2794 : : break;
2795 : :
2796 [ + - ]: 121 : CAddress addr;
2797 : 121 : NodeSeconds addr_last_try{0s};
2798 : :
2799 [ - + ]: 121 : if (fFeeler) {
2800 : : // First, try to get a tried table collision address. This returns
2801 : : // an empty (invalid) address if there are no collisions to try.
2802 [ # # ]: 0 : std::tie(addr, addr_last_try) = addrman.get().SelectTriedCollision();
2803 : :
2804 [ # # # # ]: 0 : if (!addr.IsValid()) {
2805 : : // No tried table collisions. Select a new table address
2806 : : // for our feeler.
2807 [ # # ]: 0 : std::tie(addr, addr_last_try) = addrman.get().Select(true, reachable_nets);
2808 [ # # # # ]: 0 : } else if (AlreadyConnectedToAddress(addr)) {
2809 : : // If test-before-evict logic would have us connect to a
2810 : : // peer that we're already connected to, just mark that
2811 : : // address as Good(). We won't be able to initiate the
2812 : : // connection anyway, so this avoids inadvertently evicting
2813 : : // a currently-connected peer.
2814 [ # # ]: 0 : addrman.get().Good(addr);
2815 : : // Select a new table address for our feeler instead.
2816 [ # # ]: 0 : std::tie(addr, addr_last_try) = addrman.get().Select(true, reachable_nets);
2817 : : }
2818 : : } else {
2819 : : // Not a feeler
2820 : : // If preferred_net has a value set, pick an extra outbound
2821 : : // peer from that network. The eviction logic in net_processing
2822 : : // ensures that a peer from another network will be evicted.
2823 [ - + ]: 242 : std::tie(addr, addr_last_try) = preferred_net.has_value()
2824 [ - + - - : 242 : ? addrman.get().Select(false, {*preferred_net})
- - + - -
+ - - ]
2825 [ + - ]: 242 : : addrman.get().Select(false, reachable_nets);
2826 : : }
2827 : :
2828 : : // Require outbound IPv4/IPv6 connections, other than feelers, to be to distinct network groups
2829 [ + - + - : 242 : if (!fFeeler && outbound_ipv46_peer_netgroups.contains(m_netgroupman.GetGroup(addr))) {
+ + + + ]
2830 : 106 : continue;
2831 : : }
2832 : :
2833 : : // if we selected an invalid or local address, restart
2834 [ + - + + : 15 : if (!addr.IsValid() || IsLocal(addr)) {
+ - + - ]
2835 : : break;
2836 : : }
2837 : :
2838 [ + - - + ]: 12 : if (!g_reachable_nets.Contains(addr)) {
2839 : 0 : continue;
2840 : : }
2841 : :
2842 : : // only consider very recently tried nodes after 30 failed attempts
2843 [ - + - - ]: 12 : if (current_time - addr_last_try < 10min && nTries < 30) {
2844 : 0 : continue;
2845 : : }
2846 : :
2847 : : // for non-feelers, require all the services we'll want,
2848 : : // for feelers, only require they be a full node (only because most
2849 : : // SPV clients don't have a good address DB available)
2850 [ + - + - : 12 : if (!fFeeler && !m_msgproc->HasAllDesirableServiceFlags(addr.nServices)) {
+ - ]
2851 : 0 : continue;
2852 [ - + - - ]: 12 : } else if (fFeeler && !MayHaveUsefulAddressDB(addr.nServices)) {
2853 : 0 : continue;
2854 : : }
2855 : :
2856 : : // Do not connect to bad ports, unless 50 invalid addresses have been selected already.
2857 [ + - + + : 12 : if (nTries < 50 && (addr.IsIPv4() || addr.IsIPv6()) && IsBadPort(addr.GetPort())) {
+ - + - +
- + - ]
2858 : 0 : continue;
2859 : : }
2860 : :
2861 : : // Do not make automatic outbound connections to addnode peers, to
2862 : : // not use our limited outbound slots for them and to ensure
2863 : : // addnode connections benefit from their intended protections.
2864 [ + - - + ]: 12 : if (AddedNodesContain(addr)) {
2865 [ # # # # : 0 : LogDebug(BCLog::NET, "Not making automatic %s%s connection to %s peer selected for manual (addnode) connection%s\n",
# # # # #
# # # # #
# # # # #
# # # # #
# # ]
2866 : : preferred_net.has_value() ? "network-specific " : "",
2867 : : ConnectionTypeAsString(conn_type), GetNetworkName(addr.GetNetwork()),
2868 : : fLogIPs ? strprintf(": %s", addr.ToStringAddrPort()) : "");
2869 : 0 : continue;
2870 : 0 : }
2871 : :
2872 : 12 : addrConnect = addr;
2873 : : break;
2874 : 121 : }
2875 : :
2876 [ + - + + ]: 17 : if (addrConnect.IsValid()) {
2877 [ - + ]: 13 : if (fFeeler) {
2878 : : // Add small amount of random noise before connection to avoid synchronization.
2879 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(rng.rand_uniform_duration<CThreadInterrupt::Clock>(FEELER_SLEEP_WINDOW))) {
2880 : 0 : return;
2881 : : }
2882 [ # # # # : 0 : LogDebug(BCLog::NET, "Making feeler connection to %s\n", addrConnect.ToStringAddrPort());
# # # # ]
2883 : : }
2884 : :
2885 [ - + - - : 13 : if (preferred_net != std::nullopt) LogDebug(BCLog::NET, "Making network specific connection to %s on %s.\n", addrConnect.ToStringAddrPort(), GetNetworkName(preferred_net.value()));
- - - - -
- - - -
- ]
2886 : :
2887 : : // Record addrman failure attempts when node has at least 2 persistent outbound connections to peers with
2888 : : // different netgroups in ipv4/ipv6 networks + all peers in Tor/I2P/CJDNS networks.
2889 : : // Don't record addrman failure attempts when node is offline. This can be identified since all local
2890 : : // network connections (if any) belong in the same netgroup, and the size of `outbound_ipv46_peer_netgroups` would only be 1.
2891 [ - + ]: 13 : const bool count_failures{((int)outbound_ipv46_peer_netgroups.size() + outbound_privacy_network_peers) >= std::min(m_max_automatic_connections - 1, 2)};
2892 : : // Use BIP324 transport when both us and them have NODE_V2_P2P set.
2893 [ + - ]: 13 : const bool use_v2transport(addrConnect.nServices & GetLocalServices() & NODE_P2P_V2);
2894 [ + - ]: 13 : OpenNetworkConnection(addrConnect, count_failures, std::move(grant), /*pszDest=*/nullptr, conn_type, use_v2transport);
2895 : : }
2896 : 28 : }
2897 : 36 : }
2898 : :
2899 : 31 : std::vector<CAddress> CConnman::GetCurrentBlockRelayOnlyConns() const
2900 : : {
2901 : 31 : std::vector<CAddress> ret;
2902 [ + - ]: 31 : LOCK(m_nodes_mutex);
2903 [ + + ]: 50 : for (const CNode* pnode : m_nodes) {
2904 [ + + ]: 19 : if (pnode->IsBlockOnlyConn()) {
2905 [ + - ]: 5 : ret.push_back(pnode->addr);
2906 : : }
2907 : : }
2908 : :
2909 [ + - ]: 31 : return ret;
2910 : 31 : }
2911 : :
2912 : 7166 : std::vector<AddedNodeInfo> CConnman::GetAddedNodeInfo(bool include_connected) const
2913 : : {
2914 : 7166 : std::vector<AddedNodeInfo> ret;
2915 : :
2916 [ + - ]: 7166 : std::list<AddedNodeParams> lAddresses(0);
2917 : 7166 : {
2918 [ + - ]: 7166 : LOCK(m_added_nodes_mutex);
2919 [ - + + - ]: 7166 : ret.reserve(m_added_node_params.size());
2920 [ + - ]: 7166 : std::copy(m_added_node_params.cbegin(), m_added_node_params.cend(), std::back_inserter(lAddresses));
2921 : 0 : }
2922 : :
2923 : :
2924 : : // Build a map of all already connected addresses (by IP:port and by name) to inbound/outbound and resolved CService
2925 [ + - ]: 7166 : std::map<CService, bool> mapConnected;
2926 : 7166 : std::map<std::string, std::pair<bool, CService>> mapConnectedByName;
2927 : 7166 : {
2928 [ + - ]: 7166 : LOCK(m_nodes_mutex);
2929 [ + + ]: 14210 : for (const CNode* pnode : m_nodes) {
2930 [ + - + - ]: 7044 : if (pnode->addr.IsValid()) {
2931 [ + - ]: 7044 : mapConnected[pnode->addr] = pnode->IsInboundConn();
2932 : : }
2933 [ - + ]: 7044 : std::string addrName{pnode->m_addr_name};
2934 [ + - ]: 7044 : if (!addrName.empty()) {
2935 [ + - ]: 7044 : mapConnectedByName[std::move(addrName)] = std::make_pair(pnode->IsInboundConn(), static_cast<const CService&>(pnode->addr));
2936 : : }
2937 : 7044 : }
2938 : 0 : }
2939 : :
2940 [ + + ]: 7201 : for (const auto& addr : lAddresses) {
2941 [ + - + - : 70 : CService service{MaybeFlipIPv6toCJDNS(LookupNumeric(addr.m_added_node, GetDefaultPort(addr.m_added_node)))};
+ - + - ]
2942 [ + - + - ]: 35 : AddedNodeInfo addedNode{addr, CService(), false, false};
2943 [ + - + + ]: 35 : if (service.IsValid()) {
2944 : : // strAddNode is an IP:port
2945 [ + - ]: 33 : auto it = mapConnected.find(service);
2946 [ + + ]: 33 : if (it != mapConnected.end()) {
2947 [ + + ]: 15 : if (!include_connected) {
2948 : 5 : continue;
2949 : : }
2950 : 10 : addedNode.resolvedAddress = service;
2951 : 10 : addedNode.fConnected = true;
2952 : 10 : addedNode.fInbound = it->second;
2953 : : }
2954 : : } else {
2955 : : // strAddNode is a name
2956 : 2 : auto it = mapConnectedByName.find(addr.m_added_node);
2957 [ - + ]: 2 : if (it != mapConnectedByName.end()) {
2958 [ # # ]: 0 : if (!include_connected) {
2959 : 0 : continue;
2960 : : }
2961 : 0 : addedNode.resolvedAddress = it->second.second;
2962 : 0 : addedNode.fConnected = true;
2963 : 0 : addedNode.fInbound = it->second.first;
2964 : : }
2965 : : }
2966 [ + - ]: 30 : ret.emplace_back(std::move(addedNode));
2967 : 35 : }
2968 : :
2969 : 7166 : return ret;
2970 : 7166 : }
2971 : :
2972 : 1023 : void CConnman::ThreadOpenAddedConnections()
2973 : : {
2974 : 1023 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2975 : 1023 : AssertLockNotHeld(m_reconnections_mutex);
2976 : 13279 : while (true)
2977 : : {
2978 : 7151 : CountingSemaphoreGrant<> grant(*semAddnode);
2979 [ + - ]: 7151 : std::vector<AddedNodeInfo> vInfo = GetAddedNodeInfo(/*include_connected=*/false);
2980 : 7151 : bool tried = false;
2981 [ + + ]: 7155 : for (const AddedNodeInfo& info : vInfo) {
2982 [ + - ]: 6 : if (!grant) {
2983 : : // If we've used up our semaphore and need a new one, let's not wait here since while we are waiting
2984 : : // the addednodeinfo state might change.
2985 : : break;
2986 : : }
2987 : 6 : tried = true;
2988 [ + - ]: 12 : CAddress addr(CService(), NODE_NONE);
2989 [ + - ]: 6 : OpenNetworkConnection(addr, false, std::move(grant), info.m_params.m_added_node.c_str(), ConnectionType::MANUAL, info.m_params.m_use_v2transport);
2990 [ + - + + ]: 6 : if (!m_interrupt_net->sleep_for(500ms)) return;
2991 : 4 : grant = CountingSemaphoreGrant<>(*semAddnode, /*fTry=*/true);
2992 : 6 : }
2993 : : // See if any reconnections are desired.
2994 [ + - ]: 7149 : PerformReconnections();
2995 : : // Retry every 60 seconds if a connection was attempted, otherwise two seconds
2996 [ + + + - : 7149 : if (!m_interrupt_net->sleep_for(tried ? 60s : 2s)) {
+ + ]
2997 : : return;
2998 : : }
2999 : 7151 : }
3000 : : }
3001 : :
3002 : : // if successful, this moves the passed grant to the constructed node
3003 : 660 : bool CConnman::OpenNetworkConnection(const CAddress& addrConnect,
3004 : : bool fCountFailure,
3005 : : CountingSemaphoreGrant<>&& grant_outbound,
3006 : : const char* pszDest,
3007 : : ConnectionType conn_type,
3008 : : bool use_v2transport,
3009 : : const std::optional<Proxy>& proxy_override)
3010 : : {
3011 : 660 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
3012 [ - + ]: 660 : assert(conn_type != ConnectionType::INBOUND);
3013 : :
3014 : : //
3015 : : // Initiate outbound network connection
3016 : : //
3017 [ + - ]: 660 : if (m_interrupt_net->interrupted()) {
3018 : : return false;
3019 : : }
3020 [ + - ]: 660 : if (!fNetworkActive) {
3021 : : return false;
3022 : : }
3023 [ + + ]: 660 : if (!pszDest) {
3024 [ + - + - : 37 : bool banned_or_discouraged = m_banman && (m_banman->IsDiscouraged(addrConnect) || m_banman->IsBanned(addrConnect));
- + ]
3025 [ + - + - : 37 : if (IsLocal(addrConnect) || banned_or_discouraged || AlreadyConnectedToAddress(addrConnect)) {
+ + ]
3026 : 4 : return false;
3027 : : }
3028 [ + - ]: 623 : } else if (AlreadyConnectedToHost(pszDest)) {
3029 : : return false;
3030 : : }
3031 : :
3032 [ + - ]: 656 : CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure, conn_type, use_v2transport, proxy_override);
3033 : :
3034 [ + + ]: 656 : if (!pnode)
3035 : : return false;
3036 : 624 : pnode->grantOutbound = std::move(grant_outbound);
3037 : :
3038 : 624 : m_msgproc->InitializeNode(*pnode, m_local_services);
3039 : 624 : {
3040 : 624 : LOCK(m_nodes_mutex);
3041 [ + - ]: 624 : m_nodes.push_back(pnode);
3042 : :
3043 : : // update connection count by network
3044 [ + + + - ]: 624 : if (pnode->IsManualOrFullOutboundConn()) ++m_network_conn_counts[pnode->addr.GetNetwork()];
3045 : 624 : }
3046 : :
3047 : : TRACEPOINT(net, outbound_connection,
3048 : : pnode->GetId(),
3049 : : pnode->m_addr_name.c_str(),
3050 : : pnode->ConnectionTypeAsString().c_str(),
3051 : : pnode->ConnectedThroughNetwork(),
3052 : 624 : GetNodeCount(ConnectionDirection::Out));
3053 : :
3054 : 624 : return true;
3055 : : }
3056 : :
3057 : 24 : std::optional<Network> CConnman::PrivateBroadcast::PickNetwork(std::optional<Proxy>& proxy) const
3058 : : {
3059 : 24 : prevector<4, Network> nets;
3060 : 24 : std::optional<Proxy> clearnet_proxy;
3061 [ - + ]: 24 : proxy.reset();
3062 [ + - + - ]: 24 : if (g_reachable_nets.Contains(NET_ONION)) {
3063 : 24 : nets.push_back(NET_ONION);
3064 : :
3065 [ + - + + ]: 48 : clearnet_proxy = ProxyForIPv4or6();
3066 [ + + ]: 24 : if (clearnet_proxy.has_value()) {
3067 [ + - + - ]: 18 : if (g_reachable_nets.Contains(NET_IPV4)) {
3068 : 18 : nets.push_back(NET_IPV4);
3069 : : }
3070 [ + - + - ]: 18 : if (g_reachable_nets.Contains(NET_IPV6)) {
3071 : 18 : nets.push_back(NET_IPV6);
3072 : : }
3073 : : }
3074 : : }
3075 [ + - + - ]: 24 : if (g_reachable_nets.Contains(NET_I2P)) {
3076 : 24 : nets.push_back(NET_I2P);
3077 : : }
3078 : :
3079 [ - + - + ]: 24 : if (nets.empty()) {
3080 : 0 : return std::nullopt;
3081 : : }
3082 : :
3083 [ - + + - ]: 48 : const Network net{nets[FastRandomContext{}.randrange(nets.size())]};
3084 [ + + ]: 24 : if (net == NET_IPV4 || net == NET_IPV6) {
3085 [ + - ]: 12 : proxy = clearnet_proxy;
3086 : : }
3087 : 24 : return net;
3088 : 24 : }
3089 : :
3090 : 13 : size_t CConnman::PrivateBroadcast::NumToOpen() const
3091 : : {
3092 : 13 : return m_num_to_open;
3093 : : }
3094 : :
3095 : 2371 : void CConnman::PrivateBroadcast::NumToOpenAdd(size_t n)
3096 : : {
3097 : 2371 : m_num_to_open += n;
3098 : 2371 : m_num_to_open.notify_all();
3099 : 2371 : }
3100 : :
3101 : 13 : size_t CConnman::PrivateBroadcast::NumToOpenSub(size_t n)
3102 : : {
3103 : 13 : size_t current_value{m_num_to_open.load()};
3104 : 13 : size_t new_value;
3105 : 13 : do {
3106 [ + + ]: 13 : new_value = current_value > n ? current_value - n : 0;
3107 [ - + ]: 13 : } while (!m_num_to_open.compare_exchange_strong(current_value, new_value));
3108 : 13 : return new_value;
3109 : : }
3110 : :
3111 : 26 : void CConnman::PrivateBroadcast::NumToOpenWait() const
3112 : : {
3113 : 26 : m_num_to_open.wait(0);
3114 : 26 : }
3115 : :
3116 : 24 : std::optional<Proxy> CConnman::PrivateBroadcast::ProxyForIPv4or6() const
3117 : : {
3118 : 24 : Proxy tor_proxy;
3119 [ + + + - : 24 : if (m_outbound_tor_ok_at_least_once.load() && GetProxy(NET_ONION, tor_proxy)) {
+ - ]
3120 : 18 : return tor_proxy;
3121 : : }
3122 : 6 : return std::nullopt;
3123 : 24 : }
3124 : :
3125 : : Mutex NetEventsInterface::g_msgproc_mutex;
3126 : :
3127 : 1023 : void CConnman::ThreadMessageHandler()
3128 : : {
3129 : 1023 : LOCK(NetEventsInterface::g_msgproc_mutex);
3130 : :
3131 [ + + ]: 302783 : while (!flagInterruptMsgProc)
3132 : : {
3133 : 300744 : bool fMoreWork = false;
3134 : :
3135 : 300744 : {
3136 : : // Randomize the order in which we process messages from/to our peers.
3137 : : // This prevents attacks in which an attacker exploits having multiple
3138 : : // consecutive connections in the m_nodes list.
3139 [ + - ]: 300744 : const NodesSnapshot snap{*this, /*shuffle=*/true};
3140 : :
3141 [ + + ]: 734051 : for (CNode* pnode : snap.Nodes()) {
3142 [ + + ]: 433314 : if (pnode->fDisconnect)
3143 : 123 : continue;
3144 : :
3145 : : // Receive messages
3146 [ + - ]: 433191 : bool fMoreNodeWork{m_msgproc->ProcessMessages(*pnode, flagInterruptMsgProc)};
3147 [ + + + + ]: 433191 : fMoreWork |= (fMoreNodeWork && !pnode->fPauseSend);
3148 [ + + ]: 433191 : if (flagInterruptMsgProc)
3149 : : return;
3150 : : // Send messages
3151 [ + - ]: 433184 : m_msgproc->SendMessages(*pnode);
3152 : :
3153 [ + - ]: 433184 : if (flagInterruptMsgProc)
3154 : : return;
3155 : : }
3156 [ + - ]: 300744 : }
3157 : :
3158 [ + - ]: 300737 : WAIT_LOCK(mutexMsgProc, lock);
3159 [ + + ]: 300737 : if (!fMoreWork) {
3160 [ + + + - ]: 656192 : condMsgProc.wait_until(lock, std::chrono::steady_clock::now() + std::chrono::milliseconds(100), [this]() EXCLUSIVE_LOCKS_REQUIRED(mutexMsgProc) { return fMsgProcWake; });
3161 : : }
3162 [ + - ]: 300737 : fMsgProcWake = false;
3163 : 300737 : }
3164 : 1023 : }
3165 : :
3166 : 4 : void CConnman::ThreadI2PAcceptIncoming()
3167 : : {
3168 : 4 : static constexpr auto err_wait_begin = 1s;
3169 : 4 : static constexpr auto err_wait_cap = 5min;
3170 : 4 : auto err_wait = err_wait_begin;
3171 : :
3172 : 4 : bool advertising_listen_addr = false;
3173 : 4 : i2p::Connection conn;
3174 : :
3175 : 12 : auto SleepOnFailure = [&]() {
3176 : 8 : m_interrupt_net->sleep_for(err_wait);
3177 [ + - ]: 8 : if (err_wait < err_wait_cap) {
3178 : 8 : err_wait += 1s;
3179 : : }
3180 : 12 : };
3181 : :
3182 [ + - + + ]: 12 : while (!m_interrupt_net->interrupted()) {
3183 : :
3184 [ + - + - ]: 8 : if (!m_i2p_sam_session->Listen(conn)) {
3185 [ - + - - : 8 : if (advertising_listen_addr && conn.me.IsValid()) {
- - ]
3186 [ # # ]: 0 : RemoveLocal(conn.me);
3187 : : advertising_listen_addr = false;
3188 : : }
3189 [ + - ]: 8 : SleepOnFailure();
3190 : 8 : continue;
3191 : : }
3192 : :
3193 [ # # ]: 0 : if (!advertising_listen_addr) {
3194 [ # # ]: 0 : AddLocal(conn.me, LOCAL_MANUAL);
3195 : : advertising_listen_addr = true;
3196 : : }
3197 : :
3198 [ # # # # ]: 0 : if (!m_i2p_sam_session->Accept(conn)) {
3199 [ # # ]: 0 : SleepOnFailure();
3200 : 0 : continue;
3201 : : }
3202 : :
3203 [ # # ]: 0 : CreateNodeFromAcceptedSocket(std::move(conn.sock), NetPermissionFlags::None, conn.me, conn.peer);
3204 : :
3205 : 0 : err_wait = err_wait_begin;
3206 : : }
3207 : 4 : }
3208 : :
3209 : 3 : void CConnman::ThreadPrivateBroadcast()
3210 : : {
3211 : 3 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
3212 : :
3213 : 3 : size_t addrman_num_bad_addresses{0};
3214 [ + + ]: 27 : while (!m_interrupt_net->interrupted()) {
3215 : :
3216 [ - + ]: 26 : if (!fNetworkActive) {
3217 : 0 : m_interrupt_net->sleep_for(5s);
3218 : 0 : continue;
3219 : : }
3220 : :
3221 : 26 : CountingSemaphoreGrant<> conn_max_grant{m_private_broadcast.m_sem_conn_max}; // Would block if too many are opened.
3222 : :
3223 [ + - ]: 26 : m_private_broadcast.NumToOpenWait();
3224 : :
3225 [ + - + + ]: 26 : if (m_interrupt_net->interrupted()) {
3226 : : break;
3227 : : }
3228 : :
3229 : 24 : std::optional<Proxy> proxy;
3230 [ + - ]: 24 : const std::optional<Network> net{m_private_broadcast.PickNetwork(proxy)};
3231 [ - + ]: 24 : if (!net.has_value()) {
3232 [ # # ]: 0 : LogWarning("Unable to open -privatebroadcast connections: neither Tor nor I2P is reachable");
3233 [ # # ]: 0 : m_interrupt_net->sleep_for(5s);
3234 : 0 : continue;
3235 : : }
3236 : :
3237 [ + - + - : 48 : const auto [addr, _] = addrman.get().Select(/*new_only=*/false, {net.value()});
+ - ]
3238 : :
3239 [ + - + - : 24 : if (!addr.IsValid() || IsLocal(addr)) {
+ - - + ]
3240 : 0 : ++addrman_num_bad_addresses;
3241 [ # # ]: 0 : if (addrman_num_bad_addresses > 100) {
3242 [ # # # # : 0 : LogDebug(BCLog::PRIVBROADCAST, "Connections needed but addrman keeps returning bad addresses, will retry");
# # ]
3243 [ # # ]: 0 : m_interrupt_net->sleep_for(500ms);
3244 : : }
3245 : 0 : continue;
3246 : 0 : }
3247 : 24 : addrman_num_bad_addresses = 0;
3248 : :
3249 [ + - ]: 24 : auto target_str{addr.ToStringAddrPort()};
3250 [ + + ]: 24 : if (proxy.has_value()) {
3251 [ + - + - ]: 24 : target_str += " through the proxy at " + proxy->ToString();
3252 : : }
3253 : :
3254 [ + - ]: 24 : const bool use_v2transport(addr.nServices & GetLocalServices() & NODE_P2P_V2);
3255 : :
3256 [ + - + + ]: 24 : if (OpenNetworkConnection(addr,
3257 : : /*fCountFailure=*/true,
3258 : : std::move(conn_max_grant),
3259 : : /*pszDest=*/nullptr,
3260 : : ConnectionType::PRIVATE_BROADCAST,
3261 : : use_v2transport,
3262 : : proxy)) {
3263 [ + - ]: 11 : const size_t remaining{m_private_broadcast.NumToOpenSub(1)};
3264 [ + - + - : 11 : LogDebug(BCLog::PRIVBROADCAST, "Socket connected to %s; remaining connections to open: %d", target_str, remaining);
+ - ]
3265 : : } else {
3266 [ + - ]: 13 : const size_t remaining{m_private_broadcast.NumToOpen()};
3267 [ - + ]: 13 : if (remaining == 0) {
3268 [ # # # # : 0 : LogDebug(BCLog::PRIVBROADCAST, "Failed to connect to %s, will not retry, no more connections needed", target_str);
# # ]
3269 : : } else {
3270 [ + - + - : 13 : LogDebug(BCLog::PRIVBROADCAST, "Failed to connect to %s, will retry to a different address; remaining connections to open: %d", target_str, remaining);
+ - ]
3271 [ + - ]: 13 : m_interrupt_net->sleep_for(100ms); // Prevent busy loop if OpenNetworkConnection() fails fast repeatedly.
3272 : : }
3273 : : }
3274 [ + + ]: 50 : }
3275 : 3 : }
3276 : :
3277 : 1025 : bool CConnman::BindListenPort(const CService& addrBind, bilingual_str& strError, NetPermissionFlags permissions)
3278 : : {
3279 : 1025 : int nOne = 1;
3280 : :
3281 : : // Create socket for listening for incoming connections
3282 : 1025 : struct sockaddr_storage sockaddr;
3283 : 1025 : socklen_t len = sizeof(sockaddr);
3284 [ - + ]: 1025 : if (!addrBind.GetSockAddr((struct sockaddr*)&sockaddr, &len))
3285 : : {
3286 [ # # # # ]: 0 : strError = Untranslated(strprintf("Bind address family for %s not supported", addrBind.ToStringAddrPort()));
3287 : 0 : LogError("%s\n", strError.original);
3288 : 0 : return false;
3289 : : }
3290 : :
3291 : 1025 : std::unique_ptr<Sock> sock = CreateSock(addrBind.GetSAFamily(), SOCK_STREAM, IPPROTO_TCP);
3292 [ - + ]: 1025 : if (!sock) {
3293 [ # # # # : 0 : strError = Untranslated(strprintf("Couldn't open socket for incoming connections (socket returned error %s)", NetworkErrorString(WSAGetLastError())));
# # ]
3294 [ # # ]: 0 : LogError("%s\n", strError.original);
3295 : : return false;
3296 : : }
3297 : :
3298 : : // Allow binding if the port is still in TIME_WAIT state after
3299 : : // the program was closed and restarted.
3300 [ + - - + ]: 1025 : if (sock->SetSockOpt(SOL_SOCKET, SO_REUSEADDR, &nOne, sizeof(int)) == SOCKET_ERROR) {
3301 [ # # # # : 0 : strError = Untranslated(strprintf("Error setting SO_REUSEADDR on socket: %s, continuing anyway", NetworkErrorString(WSAGetLastError())));
# # ]
3302 [ # # ]: 0 : LogInfo("%s\n", strError.original);
3303 : : }
3304 : :
3305 : : // some systems don't have IPV6_V6ONLY but are always v6only; others do have the option
3306 : : // and enable it by default or not. Try to enable it, if possible.
3307 [ + + ]: 1025 : if (addrBind.IsIPv6()) {
3308 : : #ifdef IPV6_V6ONLY
3309 [ + - - + ]: 2 : if (sock->SetSockOpt(IPPROTO_IPV6, IPV6_V6ONLY, &nOne, sizeof(int)) == SOCKET_ERROR) {
3310 [ # # # # : 0 : strError = Untranslated(strprintf("Error setting IPV6_V6ONLY on socket: %s, continuing anyway", NetworkErrorString(WSAGetLastError())));
# # ]
3311 [ # # ]: 0 : LogInfo("%s\n", strError.original);
3312 : : }
3313 : : #endif
3314 : : #ifdef WIN32
3315 : : int nProtLevel = PROTECTION_LEVEL_UNRESTRICTED;
3316 : : if (sock->SetSockOpt(IPPROTO_IPV6, IPV6_PROTECTION_LEVEL, &nProtLevel, sizeof(int)) == SOCKET_ERROR) {
3317 : : strError = Untranslated(strprintf("Error setting IPV6_PROTECTION_LEVEL on socket: %s, continuing anyway", NetworkErrorString(WSAGetLastError())));
3318 : : LogInfo("%s\n", strError.original);
3319 : : }
3320 : : #endif
3321 : : }
3322 : :
3323 [ + - - + ]: 1025 : if (sock->Bind(reinterpret_cast<struct sockaddr*>(&sockaddr), len) == SOCKET_ERROR) {
3324 : 0 : int nErr = WSAGetLastError();
3325 [ # # ]: 0 : if (nErr == WSAEADDRINUSE)
3326 [ # # # # ]: 0 : strError = strprintf(_("Unable to bind to %s on this computer. %s is probably already running."), addrBind.ToStringAddrPort(), CLIENT_NAME);
3327 : : else
3328 [ # # # # : 0 : strError = strprintf(_("Unable to bind to %s on this computer (bind returned error %s)"), addrBind.ToStringAddrPort(), NetworkErrorString(nErr));
# # ]
3329 [ # # ]: 0 : LogError("%s\n", strError.original);
3330 : : return false;
3331 : : }
3332 [ + - + - ]: 1025 : LogInfo("Bound to %s\n", addrBind.ToStringAddrPort());
3333 : :
3334 : : // Listen for incoming connections
3335 [ + - - + ]: 1025 : if (sock->Listen(SOMAXCONN) == SOCKET_ERROR)
3336 : : {
3337 [ # # # # ]: 0 : strError = strprintf(_("Listening for incoming connections failed (listen returned error %s)"), NetworkErrorString(WSAGetLastError()));
3338 [ # # ]: 0 : LogError("%s\n", strError.original);
3339 : : return false;
3340 : : }
3341 : :
3342 [ + - ]: 1025 : vhListenSocket.emplace_back(std::move(sock), permissions);
3343 : : return true;
3344 : 1025 : }
3345 : :
3346 : 16 : void Discover()
3347 : : {
3348 [ + + ]: 16 : if (!fDiscover)
3349 : : return;
3350 : :
3351 [ + + ]: 2 : for (const CNetAddr &addr: GetLocalAddresses()) {
3352 [ + - - + ]: 1 : if (AddLocal(addr, LOCAL_IF))
3353 [ # # # # ]: 0 : LogInfo("%s: %s\n", __func__, addr.ToStringAddr());
3354 : : }
3355 : : }
3356 : :
3357 : 1297 : void CConnman::SetNetworkActive(bool active)
3358 : : {
3359 : 1297 : LogInfo("%s: %s\n", __func__, active);
3360 : :
3361 [ + + ]: 1297 : if (fNetworkActive == active) {
3362 : : return;
3363 : : }
3364 : :
3365 [ + + ]: 26 : fNetworkActive = active;
3366 : :
3367 [ + + ]: 26 : if (m_client_interface) {
3368 : 21 : m_client_interface->NotifyNetworkActiveChanged(fNetworkActive);
3369 : : }
3370 : : }
3371 : :
3372 : 1274 : CConnman::CConnman(uint64_t nSeed0In,
3373 : : uint64_t nSeed1In,
3374 : : AddrMan& addrman_in,
3375 : : const NetGroupManager& netgroupman,
3376 : : const CChainParams& params,
3377 : : bool network_active,
3378 : 1274 : std::shared_ptr<CThreadInterrupt> interrupt_net)
3379 [ + - ]: 1274 : : addrman(addrman_in)
3380 [ + - ]: 1274 : , m_netgroupman{netgroupman}
3381 : 1274 : , nSeed0(nSeed0In)
3382 : 1274 : , nSeed1(nSeed1In)
3383 [ + - - - ]: 1274 : , m_interrupt_net{interrupt_net}
3384 [ + - + - : 2548 : , m_params(params)
+ - + - ]
3385 : : {
3386 [ + - ]: 1274 : SetTryNewOutboundPeer(false);
3387 : :
3388 : 1274 : Options connOptions;
3389 [ + - ]: 1274 : Init(connOptions);
3390 [ + - ]: 1274 : SetNetworkActive(network_active);
3391 : 1274 : }
3392 : :
3393 : 1676 : NodeId CConnman::GetNewNodeId()
3394 : : {
3395 : 1676 : return nLastNodeId.fetch_add(1, std::memory_order_relaxed);
3396 : : }
3397 : :
3398 : 2 : uint16_t CConnman::GetDefaultPort(Network net) const
3399 : : {
3400 [ - + ]: 2 : return net == NET_I2P ? I2P_SAM31_PORT : m_params.GetDefaultPort();
3401 : : }
3402 : :
3403 : 699 : uint16_t CConnman::GetDefaultPort(const std::string& addr) const
3404 : : {
3405 : 699 : CNetAddr a;
3406 [ - + + - : 699 : return a.SetSpecial(addr) ? GetDefaultPort(a.GetNetwork()) : m_params.GetDefaultPort();
+ + + - +
- ]
3407 : 699 : }
3408 : :
3409 : 1025 : bool CConnman::Bind(const CService& addr_, unsigned int flags, NetPermissionFlags permissions)
3410 : : {
3411 : 1025 : const CService addr{MaybeFlipIPv6toCJDNS(addr_)};
3412 : :
3413 [ + - ]: 1025 : bilingual_str strError;
3414 [ + - - + ]: 1025 : if (!BindListenPort(addr, strError, permissions)) {
3415 [ # # # # ]: 0 : if ((flags & BF_REPORT_ERROR) && m_client_interface) {
3416 [ # # ]: 0 : m_client_interface->ThreadSafeMessageBox(strError, CClientUIInterface::MSG_ERROR);
3417 : : }
3418 : 0 : return false;
3419 : : }
3420 : :
3421 [ + - - + : 1025 : if (addr.IsRoutable() && fDiscover && !(flags & BF_DONT_ADVERTISE) && !NetPermissions::HasFlag(permissions, NetPermissionFlags::NoBan)) {
- - - - -
- ]
3422 [ # # ]: 0 : AddLocal(addr, LOCAL_BIND);
3423 : : }
3424 : :
3425 : : return true;
3426 : 1025 : }
3427 : :
3428 : 1009 : bool CConnman::InitBinds(const Options& options)
3429 : : {
3430 [ + + ]: 2013 : for (const auto& addrBind : options.vBinds) {
3431 [ + - ]: 1004 : if (!Bind(addrBind, BF_REPORT_ERROR, NetPermissionFlags::None)) {
3432 : : return false;
3433 : : }
3434 : : }
3435 [ + + ]: 1010 : for (const auto& addrBind : options.vWhiteBinds) {
3436 [ + - ]: 1 : if (!Bind(addrBind.m_service, BF_REPORT_ERROR, addrBind.m_flags)) {
3437 : : return false;
3438 : : }
3439 : : }
3440 [ + + ]: 1025 : for (const auto& addr_bind : options.onion_binds) {
3441 [ + - ]: 16 : if (!Bind(addr_bind, BF_REPORT_ERROR | BF_DONT_ADVERTISE, NetPermissionFlags::None)) {
3442 : : return false;
3443 : : }
3444 : : }
3445 [ + + ]: 1009 : if (options.bind_on_any) {
3446 : : // Don't consider errors to bind on IPv6 "::" fatal because the host OS
3447 : : // may not have IPv6 support and the user did not explicitly ask us to
3448 : : // bind on that.
3449 : 2 : const CService ipv6_any{in6_addr(COMPAT_IN6ADDR_ANY_INIT), GetListenPort()}; // ::
3450 [ + - ]: 2 : Bind(ipv6_any, BF_NONE, NetPermissionFlags::None);
3451 : :
3452 : 2 : struct in_addr inaddr_any;
3453 : 2 : inaddr_any.s_addr = htonl(INADDR_ANY);
3454 [ + - + - ]: 2 : const CService ipv4_any{inaddr_any, GetListenPort()}; // 0.0.0.0
3455 [ + - - + ]: 2 : if (!Bind(ipv4_any, BF_REPORT_ERROR, NetPermissionFlags::None)) {
3456 : 0 : return false;
3457 : : }
3458 : 2 : }
3459 : : return true;
3460 : : }
3461 : :
3462 : 1023 : bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
3463 : : {
3464 : 1023 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3465 : 1023 : Init(connOptions);
3466 : :
3467 [ + + - + ]: 1023 : if (fListen && !InitBinds(connOptions)) {
3468 [ # # ]: 0 : if (m_client_interface) {
3469 [ # # ]: 0 : m_client_interface->ThreadSafeMessageBox(
3470 : 0 : _("Failed to listen on any port. Use -listen=0 if you want this."),
3471 : : CClientUIInterface::MSG_ERROR);
3472 : : }
3473 : 0 : return false;
3474 : : }
3475 : :
3476 : 1023 : Proxy i2p_sam;
3477 [ + - + + : 1023 : if (GetProxy(NET_I2P, i2p_sam) && connOptions.m_i2p_accept_incoming) {
+ + ]
3478 [ + - + - ]: 20 : m_i2p_sam_session = std::make_unique<i2p::sam::Session>(gArgs.GetDataDirNet() / "i2p_private_key",
3479 [ + - ]: 8 : i2p_sam, m_interrupt_net);
3480 : : }
3481 : :
3482 : : // Randomize the order in which we may query seednode to potentially prevent connecting to the same one every restart (and signal that we have restarted)
3483 [ + - ]: 1023 : std::vector<std::string> seed_nodes = connOptions.vSeedNodes;
3484 [ + + ]: 1023 : if (!seed_nodes.empty()) {
3485 : 5 : std::shuffle(seed_nodes.begin(), seed_nodes.end(), FastRandomContext{});
3486 : : }
3487 : :
3488 [ + + ]: 1023 : if (m_use_addrman_outgoing) {
3489 : : // Load addresses from anchors.dat
3490 [ + - + - : 93 : m_anchors = ReadAnchors(gArgs.GetDataDirNet() / ANCHORS_DATABASE_FILENAME);
+ - ]
3491 [ - + - + ]: 31 : if (m_anchors.size() > MAX_BLOCK_RELAY_ONLY_ANCHORS) {
3492 [ # # ]: 0 : m_anchors.resize(MAX_BLOCK_RELAY_ONLY_ANCHORS);
3493 : : }
3494 [ - + + - ]: 31 : LogInfo("%i block-relay-only anchors will be tried for connections.\n", m_anchors.size());
3495 : : }
3496 : :
3497 [ + - ]: 1023 : if (m_client_interface) {
3498 [ + - + - ]: 2046 : m_client_interface->InitMessage(_("Starting network threads…"));
3499 : : }
3500 : :
3501 : 1023 : fAddressesInitialized = true;
3502 : :
3503 [ + - ]: 1023 : if (semOutbound == nullptr) {
3504 : : // initialize semaphore
3505 [ + + + - ]: 1024 : semOutbound = std::make_unique<std::counting_semaphore<>>(std::min(m_max_automatic_outbound, m_max_automatic_connections));
3506 : : }
3507 [ + - ]: 1023 : if (semAddnode == nullptr) {
3508 : : // initialize semaphore
3509 [ + - ]: 1023 : semAddnode = std::make_unique<std::counting_semaphore<>>(m_max_addnode);
3510 : : }
3511 : :
3512 : : //
3513 : : // Start threads
3514 : : //
3515 [ - + ]: 1023 : assert(m_msgproc);
3516 [ + - ]: 1023 : m_interrupt_net->reset();
3517 [ + - ]: 1023 : flagInterruptMsgProc = false;
3518 : :
3519 : 1023 : {
3520 [ + - ]: 1023 : LOCK(mutexMsgProc);
3521 [ + - ]: 1023 : fMsgProcWake = false;
3522 : 1023 : }
3523 : :
3524 : : // Send and receive from sockets, accept connections
3525 [ + - ]: 2046 : threadSocketHandler = std::thread(&util::TraceThread, "net", [this] { ThreadSocketHandler(); });
3526 : :
3527 [ + - + - : 1023 : if (!gArgs.GetBoolArg("-dnsseed", DEFAULT_DNSSEED))
+ + ]
3528 [ + - ]: 1009 : LogInfo("DNS seeding disabled\n");
3529 : : else
3530 [ + - ]: 28 : threadDNSAddressSeed = std::thread(&util::TraceThread, "dnsseed", [this] { ThreadDNSAddressSeed(); });
3531 : :
3532 : : // Initiate manual connections
3533 [ + - ]: 2046 : threadOpenAddedConnections = std::thread(&util::TraceThread, "addcon", [this] { ThreadOpenAddedConnections(); });
3534 : :
3535 [ + + + - ]: 1023 : if (connOptions.m_use_addrman_outgoing && !connOptions.m_specified_outgoing.empty()) {
3536 [ # # ]: 0 : if (m_client_interface) {
3537 [ # # ]: 0 : m_client_interface->ThreadSafeMessageBox(
3538 [ # # ]: 0 : _("Cannot provide specific connections and have addrman find outgoing connections at the same time."),
3539 : : CClientUIInterface::MSG_ERROR);
3540 : : }
3541 : 0 : return false;
3542 : : }
3543 [ + + + + ]: 1023 : if (connOptions.m_use_addrman_outgoing || !connOptions.m_specified_outgoing.empty()) {
3544 : 36 : threadOpenConnections = std::thread(
3545 [ + - ]: 36 : &util::TraceThread, "opencon",
3546 [ + - + - : 144 : [this, connect = connOptions.m_specified_outgoing, seed_nodes = std::move(seed_nodes)] { ThreadOpenConnections(connect, seed_nodes); });
- + + - ]
3547 : : }
3548 : :
3549 : : // Process messages
3550 [ + - ]: 2046 : threadMessageHandler = std::thread(&util::TraceThread, "msghand", [this] { ThreadMessageHandler(); });
3551 : :
3552 [ + + ]: 1023 : if (m_i2p_sam_session) {
3553 : 4 : threadI2PAcceptIncoming =
3554 [ + - ]: 8 : std::thread(&util::TraceThread, "i2paccept", [this] { ThreadI2PAcceptIncoming(); });
3555 : : }
3556 : :
3557 [ + - + - : 1023 : if (gArgs.GetBoolArg("-privatebroadcast", DEFAULT_PRIVATE_BROADCAST)) {
+ + ]
3558 : 3 : threadPrivateBroadcast =
3559 [ + - ]: 6 : std::thread(&util::TraceThread, "privbcast", [this] { ThreadPrivateBroadcast(); });
3560 : : }
3561 : :
3562 : : // Dump network addresses
3563 [ + - ]: 1032 : scheduler.scheduleEvery([this] { DumpAddresses(); }, DUMP_PEERS_INTERVAL);
3564 : :
3565 : : // Run the ASMap Health check once and then schedule it to run every 24h.
3566 [ + - + + ]: 1023 : if (m_netgroupman.UsingASMap()) {
3567 [ + - ]: 7 : ASMapHealthCheck();
3568 [ + - ]: 14 : scheduler.scheduleEvery([this] { ASMapHealthCheck(); }, ASMAP_HEALTH_CHECK_INTERVAL);
3569 : : }
3570 : :
3571 : : return true;
3572 : 2046 : }
3573 : :
3574 : : class CNetCleanup
3575 : : {
3576 : : public:
3577 : : CNetCleanup() = default;
3578 : :
3579 : : ~CNetCleanup()
3580 : : {
3581 : : #ifdef WIN32
3582 : : // Shutdown Windows Sockets
3583 : : WSACleanup();
3584 : : #endif
3585 : : }
3586 : : };
3587 : : static CNetCleanup instance_of_cnetcleanup;
3588 : :
3589 : 2363 : void CConnman::Interrupt()
3590 : : {
3591 : 2363 : {
3592 : 2363 : LOCK(mutexMsgProc);
3593 [ + - ]: 2363 : flagInterruptMsgProc = true;
3594 : 2363 : }
3595 : 2363 : condMsgProc.notify_all();
3596 : :
3597 : 2363 : (*m_interrupt_net)();
3598 : 2363 : g_socks5_interrupt();
3599 : :
3600 [ + + ]: 2363 : if (semOutbound) {
3601 [ + + ]: 12266 : for (int i=0; i<m_max_automatic_outbound; i++) {
3602 : 11243 : semOutbound->release();
3603 : : }
3604 : : }
3605 : :
3606 [ + + ]: 2363 : if (semAddnode) {
3607 [ + + ]: 9207 : for (int i=0; i<m_max_addnode; i++) {
3608 : 8184 : semAddnode->release();
3609 : : }
3610 : : }
3611 : :
3612 : 2363 : m_private_broadcast.m_sem_conn_max.release();
3613 : 2363 : m_private_broadcast.NumToOpenAdd(1); // Just unblock NumToOpenWait() to be able to continue with shutdown.
3614 : 2363 : }
3615 : :
3616 : 2363 : void CConnman::StopThreads()
3617 : : {
3618 [ + + ]: 2363 : if (threadPrivateBroadcast.joinable()) {
3619 : 3 : threadPrivateBroadcast.join();
3620 : : }
3621 [ + + ]: 2363 : if (threadI2PAcceptIncoming.joinable()) {
3622 : 4 : threadI2PAcceptIncoming.join();
3623 : : }
3624 [ + + ]: 2363 : if (threadMessageHandler.joinable())
3625 : 1023 : threadMessageHandler.join();
3626 [ + + ]: 2363 : if (threadOpenConnections.joinable())
3627 : 36 : threadOpenConnections.join();
3628 [ + + ]: 2363 : if (threadOpenAddedConnections.joinable())
3629 : 1023 : threadOpenAddedConnections.join();
3630 [ + + ]: 2363 : if (threadDNSAddressSeed.joinable())
3631 : 14 : threadDNSAddressSeed.join();
3632 [ + + ]: 2363 : if (threadSocketHandler.joinable())
3633 : 1023 : threadSocketHandler.join();
3634 : 2363 : }
3635 : :
3636 : 2363 : void CConnman::StopNodes()
3637 : : {
3638 : 2363 : AssertLockNotHeld(m_reconnections_mutex);
3639 : :
3640 [ + + ]: 2363 : if (fAddressesInitialized) {
3641 : 1023 : DumpAddresses();
3642 : 1023 : fAddressesInitialized = false;
3643 : :
3644 [ + + ]: 1023 : if (m_use_addrman_outgoing) {
3645 : : // Anchor connections are only dumped during clean shutdown.
3646 : 31 : std::vector<CAddress> anchors_to_dump = GetCurrentBlockRelayOnlyConns();
3647 [ - + - + ]: 31 : if (anchors_to_dump.size() > MAX_BLOCK_RELAY_ONLY_ANCHORS) {
3648 [ # # ]: 0 : anchors_to_dump.resize(MAX_BLOCK_RELAY_ONLY_ANCHORS);
3649 : : }
3650 [ + - + - : 93 : DumpAnchors(gArgs.GetDataDirNet() / ANCHORS_DATABASE_FILENAME, anchors_to_dump);
+ - ]
3651 : 31 : }
3652 : : }
3653 : :
3654 : : // Delete peer connections.
3655 : 2363 : std::vector<CNode*> nodes;
3656 [ + - + - ]: 4726 : WITH_LOCK(m_nodes_mutex, nodes.swap(m_nodes));
3657 [ + + ]: 3126 : for (CNode* pnode : nodes) {
3658 [ + - + - : 1526 : LogDebug(BCLog::NET, "Stopping node, %s", pnode->DisconnectMsg());
+ - + - ]
3659 [ + - ]: 763 : pnode->CloseSocketDisconnect();
3660 [ + - ]: 763 : DeleteNode(pnode);
3661 : : }
3662 : :
3663 [ - + ]: 2363 : for (CNode* pnode : m_nodes_disconnected) {
3664 [ # # ]: 0 : DeleteNode(pnode);
3665 : : }
3666 : 2363 : m_nodes_disconnected.clear();
3667 [ + - + - ]: 4726 : WITH_LOCK(m_reconnections_mutex, m_reconnections.clear());
3668 : 2363 : vhListenSocket.clear();
3669 [ + + ]: 2363 : semOutbound.reset();
3670 [ + + ]: 3386 : semAddnode.reset();
3671 : 2363 : }
3672 : :
3673 : 1676 : void CConnman::DeleteNode(CNode* pnode)
3674 : : {
3675 [ - + ]: 1676 : assert(pnode);
3676 : 1676 : m_msgproc->FinalizeNode(*pnode);
3677 : 1676 : delete pnode;
3678 : 1676 : }
3679 : :
3680 [ + - ]: 1274 : CConnman::~CConnman()
3681 : : {
3682 : 1274 : Interrupt();
3683 : 1274 : Stop();
3684 : 2548 : }
3685 : :
3686 : 476 : std::vector<CAddress> CConnman::GetAddressesUnsafe(size_t max_addresses, size_t max_pct, std::optional<Network> network, const bool filtered) const
3687 : : {
3688 : 476 : std::vector<CAddress> addresses = addrman.get().GetAddr(max_addresses, max_pct, network, filtered);
3689 [ + - ]: 476 : if (m_banman) {
3690 [ + - ]: 476 : addresses.erase(std::remove_if(addresses.begin(), addresses.end(),
3691 [ + - - + ]: 34383 : [this](const CAddress& addr){return m_banman->IsDiscouraged(addr) || m_banman->IsBanned(addr);}),
3692 [ + - ]: 476 : addresses.end());
3693 : : }
3694 : 476 : return addresses;
3695 : 0 : }
3696 : :
3697 : 983 : std::vector<CAddress> CConnman::GetAddresses(CNode& requestor, size_t max_addresses, size_t max_pct)
3698 : : {
3699 : 983 : uint64_t network_id = requestor.m_network_key;
3700 : 983 : const auto current_time = GetTime<std::chrono::microseconds>();
3701 [ + - ]: 983 : auto r = m_addr_response_caches.emplace(network_id, CachedAddrResponse{});
3702 [ + + ]: 983 : CachedAddrResponse& cache_entry = r.first->second;
3703 [ + + ]: 983 : if (cache_entry.m_cache_entry_expiration < current_time) { // If emplace() added new one it has expiration 0.
3704 : 393 : cache_entry.m_addrs_response_cache = GetAddressesUnsafe(max_addresses, max_pct, /*network=*/std::nullopt);
3705 : : // Choosing a proper cache lifetime is a trade-off between the privacy leak minimization
3706 : : // and the usefulness of ADDR responses to honest users.
3707 : : //
3708 : : // Longer cache lifetime makes it more difficult for an attacker to scrape
3709 : : // enough AddrMan data to maliciously infer something useful.
3710 : : // By the time an attacker scraped enough AddrMan records, most of
3711 : : // the records should be old enough to not leak topology info by
3712 : : // e.g. analyzing real-time changes in timestamps.
3713 : : //
3714 : : // It takes only several hundred requests to scrape everything from an AddrMan containing 100,000 nodes,
3715 : : // so ~24 hours of cache lifetime indeed makes the data less inferable by the time
3716 : : // most of it could be scraped (considering that timestamps are updated via
3717 : : // ADDR self-announcements and when nodes communicate).
3718 : : // We also should be robust to those attacks which may not require scraping *full* victim's AddrMan
3719 : : // (because even several timestamps of the same handful of nodes may leak privacy).
3720 : : //
3721 : : // On the other hand, longer cache lifetime makes ADDR responses
3722 : : // outdated and less useful for an honest requestor, e.g. if most nodes
3723 : : // in the ADDR response are no longer active.
3724 : : //
3725 : : // However, the churn in the network is known to be rather low. Since we consider
3726 : : // nodes to be "terrible" (see IsTerrible()) if the timestamps are older than 30 days,
3727 : : // max. 24 hours of "penalty" due to cache shouldn't make any meaningful difference
3728 : : // in terms of the freshness of the response.
3729 : 393 : cache_entry.m_cache_entry_expiration = current_time +
3730 : 393 : 21h + FastRandomContext().randrange<std::chrono::microseconds>(6h);
3731 : : }
3732 : 983 : return cache_entry.m_addrs_response_cache;
3733 : : }
3734 : :
3735 : 15 : bool CConnman::AddNode(const AddedNodeParams& add)
3736 : : {
3737 [ + - + - ]: 15 : const CService resolved(LookupNumeric(add.m_added_node, GetDefaultPort(add.m_added_node)));
3738 [ + - ]: 15 : const bool resolved_is_valid{resolved.IsValid()};
3739 : :
3740 [ + - ]: 15 : LOCK(m_added_nodes_mutex);
3741 [ + + ]: 27 : for (const auto& it : m_added_node_params) {
3742 [ + + + - : 50 : if (add.m_added_node == it.m_added_node || (resolved_is_valid && resolved == LookupNumeric(it.m_added_node, GetDefaultPort(it.m_added_node)))) return false;
+ - + - +
- + - + +
+ + + + -
- - - ]
3743 : : }
3744 : :
3745 [ + - ]: 9 : m_added_node_params.push_back(add);
3746 : : return true;
3747 : 15 : }
3748 : :
3749 : 4 : bool CConnman::RemoveAddedNode(std::string_view node)
3750 : : {
3751 : 4 : LOCK(m_added_nodes_mutex);
3752 [ + + ]: 6 : for (auto it = m_added_node_params.begin(); it != m_added_node_params.end(); ++it) {
3753 [ - + + + ]: 4 : if (node == it->m_added_node) {
3754 : 2 : m_added_node_params.erase(it);
3755 : 2 : return true;
3756 : : }
3757 : : }
3758 : : return false;
3759 : 4 : }
3760 : :
3761 : 18 : bool CConnman::AddedNodesContain(const CAddress& addr) const
3762 : : {
3763 : 18 : AssertLockNotHeld(m_added_nodes_mutex);
3764 : 18 : const std::string addr_str{addr.ToStringAddr()};
3765 [ + - ]: 18 : const std::string addr_port_str{addr.ToStringAddrPort()};
3766 [ + - ]: 18 : LOCK(m_added_nodes_mutex);
3767 [ - + ]: 18 : return (m_added_node_params.size() < 24 // bound the query to a reasonable limit
3768 [ + - + + ]: 18 : && std::any_of(m_added_node_params.cbegin(), m_added_node_params.cend(),
3769 [ + - + + : 38 : [&](const auto& p) { return p.m_added_node == addr_str || p.m_added_node == addr_port_str; }));
+ - ]
3770 : 18 : }
3771 : :
3772 : 2976 : size_t CConnman::GetNodeCount(ConnectionDirection flags) const
3773 : : {
3774 : 2976 : LOCK(m_nodes_mutex);
3775 [ + + ]: 2976 : if (flags == ConnectionDirection::Both) // Shortcut if we want total
3776 [ - + ]: 996 : return m_nodes.size();
3777 : :
3778 : 1980 : int nNum = 0;
3779 [ + + ]: 4802 : for (const auto& pnode : m_nodes) {
3780 [ + + + + ]: 4346 : if (flags & (pnode->IsInboundConn() ? ConnectionDirection::In : ConnectionDirection::Out)) {
3781 : 1411 : nNum++;
3782 : : }
3783 : : }
3784 : :
3785 : 1980 : return nNum;
3786 : 2976 : }
3787 : :
3788 : :
3789 : 0 : std::map<CNetAddr, LocalServiceInfo> CConnman::getNetLocalAddresses() const
3790 : : {
3791 : 0 : LOCK(g_maplocalhost_mutex);
3792 [ # # # # ]: 0 : return mapLocalHost;
3793 : 0 : }
3794 : :
3795 : 16156 : uint32_t CConnman::GetMappedAS(const CNetAddr& addr) const
3796 : : {
3797 : 16156 : return m_netgroupman.GetMappedAS(addr);
3798 : : }
3799 : :
3800 : 6073 : void CConnman::GetNodeStats(std::vector<CNodeStats>& vstats) const
3801 : : {
3802 : 6073 : vstats.clear();
3803 : 6073 : LOCK(m_nodes_mutex);
3804 [ - + + - ]: 6073 : vstats.reserve(m_nodes.size());
3805 [ + + ]: 18971 : for (CNode* pnode : m_nodes) {
3806 [ + - ]: 12898 : vstats.emplace_back();
3807 [ + - ]: 12898 : pnode->CopyStats(vstats.back());
3808 [ + - ]: 12898 : vstats.back().m_mapped_as = GetMappedAS(pnode->addr);
3809 : : }
3810 : 6073 : }
3811 : :
3812 : 4 : bool CConnman::DisconnectNode(std::string_view strNode)
3813 : : {
3814 : 4 : LOCK(m_nodes_mutex);
3815 [ - + ]: 10 : auto it = std::ranges::find_if(m_nodes, [&strNode](CNode* node) { return node->m_addr_name == strNode; });
3816 [ + + ]: 4 : if (it != m_nodes.end()) {
3817 : 2 : CNode* node{*it};
3818 [ + - + - : 4 : LogDebug(BCLog::NET, "disconnect by address%s match, %s", (fLogIPs ? strprintf("=%s", strNode) : ""), node->DisconnectMsg());
+ - - + -
- + - +
- ]
3819 : 2 : node->fDisconnect = true;
3820 : 2 : return true;
3821 : : }
3822 : : return false;
3823 : 4 : }
3824 : :
3825 : 33 : bool CConnman::DisconnectNode(const CSubNet& subnet)
3826 : : {
3827 : 33 : bool disconnected = false;
3828 : 33 : LOCK(m_nodes_mutex);
3829 [ + + ]: 49 : for (CNode* pnode : m_nodes) {
3830 [ + - + + ]: 16 : if (subnet.Match(pnode->addr)) {
3831 [ + - + - : 33 : LogDebug(BCLog::NET, "disconnect by subnet%s match, %s", (fLogIPs ? strprintf("=%s", subnet.ToString()) : ""), pnode->DisconnectMsg());
+ - - + -
- - - + -
+ - - + -
- ]
3832 : 11 : pnode->fDisconnect = true;
3833 : 11 : disconnected = true;
3834 : : }
3835 : : }
3836 [ + - ]: 33 : return disconnected;
3837 : 33 : }
3838 : :
3839 : 20 : bool CConnman::DisconnectNode(const CNetAddr& addr)
3840 : : {
3841 [ + - ]: 20 : return DisconnectNode(CSubNet(addr));
3842 : : }
3843 : :
3844 : 122 : bool CConnman::DisconnectNode(NodeId id)
3845 : : {
3846 : 122 : LOCK(m_nodes_mutex);
3847 [ + - ]: 183 : for(CNode* pnode : m_nodes) {
3848 [ + + ]: 183 : if (id == pnode->GetId()) {
3849 [ + - + - : 244 : LogDebug(BCLog::NET, "disconnect by id, %s", pnode->DisconnectMsg());
+ - + - ]
3850 : 122 : pnode->fDisconnect = true;
3851 : 122 : return true;
3852 : : }
3853 : : }
3854 : : return false;
3855 : 122 : }
3856 : :
3857 : 251592 : void CConnman::RecordBytesRecv(uint64_t bytes)
3858 : : {
3859 : 251592 : nTotalBytesRecv += bytes;
3860 : 251592 : }
3861 : :
3862 : 169433 : void CConnman::RecordBytesSent(uint64_t bytes)
3863 : : {
3864 : 169433 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3865 : 169433 : LOCK(m_total_bytes_sent_mutex);
3866 : :
3867 : 169433 : nTotalBytesSent += bytes;
3868 : :
3869 : 169433 : const auto now = GetTime<std::chrono::seconds>();
3870 [ + + ]: 169433 : if (nMaxOutboundCycleStartTime + MAX_UPLOAD_TIMEFRAME < now)
3871 : : {
3872 : : // timeframe expired, reset cycle
3873 : 554 : nMaxOutboundCycleStartTime = now;
3874 : 554 : nMaxOutboundTotalBytesSentInCycle = 0;
3875 : : }
3876 : :
3877 [ + - ]: 169433 : nMaxOutboundTotalBytesSentInCycle += bytes;
3878 : 169433 : }
3879 : :
3880 : 20 : uint64_t CConnman::GetMaxOutboundTarget() const
3881 : : {
3882 : 20 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3883 : 20 : LOCK(m_total_bytes_sent_mutex);
3884 [ + - ]: 20 : return nMaxOutboundLimit;
3885 : 20 : }
3886 : :
3887 : 20 : std::chrono::seconds CConnman::GetMaxOutboundTimeframe() const
3888 : : {
3889 : 20 : return MAX_UPLOAD_TIMEFRAME;
3890 : : }
3891 : :
3892 : 20 : std::chrono::seconds CConnman::GetMaxOutboundTimeLeftInCycle() const
3893 : : {
3894 : 20 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3895 : 20 : LOCK(m_total_bytes_sent_mutex);
3896 [ + - ]: 20 : return GetMaxOutboundTimeLeftInCycle_();
3897 : 20 : }
3898 : :
3899 : 1128 : std::chrono::seconds CConnman::GetMaxOutboundTimeLeftInCycle_() const
3900 : : {
3901 : 1128 : AssertLockHeld(m_total_bytes_sent_mutex);
3902 : :
3903 [ + + ]: 1128 : if (nMaxOutboundLimit == 0)
3904 : 14 : return 0s;
3905 : :
3906 [ + + ]: 1114 : if (nMaxOutboundCycleStartTime.count() == 0)
3907 : 4 : return MAX_UPLOAD_TIMEFRAME;
3908 : :
3909 : 1110 : const std::chrono::seconds cycleEndTime = nMaxOutboundCycleStartTime + MAX_UPLOAD_TIMEFRAME;
3910 : 1110 : const auto now = GetTime<std::chrono::seconds>();
3911 [ - + ]: 1110 : return (cycleEndTime < now) ? 0s : cycleEndTime - now;
3912 : : }
3913 : :
3914 : 40051 : bool CConnman::OutboundTargetReached(bool historicalBlockServingLimit) const
3915 : : {
3916 : 40051 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3917 : 40051 : LOCK(m_total_bytes_sent_mutex);
3918 [ + + ]: 40051 : if (nMaxOutboundLimit == 0)
3919 : : return false;
3920 : :
3921 [ + + ]: 1116 : if (historicalBlockServingLimit)
3922 : : {
3923 : : // keep a large enough buffer to at least relay each block once
3924 [ + - ]: 1108 : const std::chrono::seconds timeLeftInCycle = GetMaxOutboundTimeLeftInCycle_();
3925 : 1108 : const uint64_t buffer = timeLeftInCycle / std::chrono::minutes{10} * MAX_BLOCK_SERIALIZED_SIZE;
3926 [ + + + + ]: 1108 : if (buffer >= nMaxOutboundLimit || nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit - buffer)
3927 : 827 : return true;
3928 : : }
3929 [ + + ]: 8 : else if (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit)
3930 : 3 : return true;
3931 : :
3932 : : return false;
3933 : 40051 : }
3934 : :
3935 : 20 : uint64_t CConnman::GetOutboundTargetBytesLeft() const
3936 : : {
3937 : 20 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3938 : 20 : LOCK(m_total_bytes_sent_mutex);
3939 [ + + ]: 20 : if (nMaxOutboundLimit == 0)
3940 : : return 0;
3941 : :
3942 [ + + ]: 6 : return (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit) ? 0 : nMaxOutboundLimit - nMaxOutboundTotalBytesSentInCycle;
3943 : 20 : }
3944 : :
3945 : 20 : uint64_t CConnman::GetTotalBytesRecv() const
3946 : : {
3947 : 20 : return nTotalBytesRecv;
3948 : : }
3949 : :
3950 : 20 : uint64_t CConnman::GetTotalBytesSent() const
3951 : : {
3952 : 20 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3953 : 20 : LOCK(m_total_bytes_sent_mutex);
3954 [ + - ]: 20 : return nTotalBytesSent;
3955 : 20 : }
3956 : :
3957 : 5060 : ServiceFlags CConnman::GetLocalServices() const
3958 : : {
3959 : 5060 : return m_local_services;
3960 : : }
3961 : :
3962 : 1716 : static std::unique_ptr<Transport> MakeTransport(NodeId id, bool use_v2transport, bool inbound) noexcept
3963 : : {
3964 [ + + ]: 1716 : if (use_v2transport) {
3965 [ - + ]: 177 : return std::make_unique<V2Transport>(id, /*initiating=*/!inbound);
3966 : : } else {
3967 [ - + ]: 1539 : return std::make_unique<V1Transport>(id);
3968 : : }
3969 : : }
3970 : :
3971 : 1716 : CNode::CNode(NodeId idIn,
3972 : : std::shared_ptr<Sock> sock,
3973 : : const CAddress& addrIn,
3974 : : uint64_t nKeyedNetGroupIn,
3975 : : uint64_t nLocalHostNonceIn,
3976 : : const CService& addrBindIn,
3977 : : const std::string& addrNameIn,
3978 : : ConnectionType conn_type_in,
3979 : : bool inbound_onion,
3980 : : uint64_t network_key,
3981 : 1716 : CNodeOptions&& node_opts)
3982 : 1716 : : m_transport{MakeTransport(idIn, node_opts.use_v2transport, conn_type_in == ConnectionType::INBOUND)},
3983 : 1716 : m_permission_flags{node_opts.permission_flags},
3984 [ + + ]: 1716 : m_sock{sock},
3985 : 1716 : m_connected{GetTime<std::chrono::seconds>()},
3986 : 1716 : addr{addrIn},
3987 : 1716 : addrBind{addrBindIn},
3988 [ + + + - ]: 1716 : m_addr_name{addrNameIn.empty() ? addr.ToStringAddrPort() : addrNameIn},
3989 [ - + ]: 1716 : m_dest(addrNameIn),
3990 : 1716 : m_inbound_onion{inbound_onion},
3991 [ + - ]: 1716 : m_prefer_evict{node_opts.prefer_evict},
3992 : 1716 : nKeyedNetGroup{nKeyedNetGroupIn},
3993 : 1716 : m_network_key{network_key},
3994 : 1716 : m_conn_type{conn_type_in},
3995 : 1716 : id{idIn},
3996 : 1716 : nLocalHostNonce{nLocalHostNonceIn},
3997 [ + - ]: 1716 : m_recv_flood_size{node_opts.recv_flood_size},
3998 [ + - + - : 3432 : m_i2p_sam_session{std::move(node_opts.i2p_sam_session)}
+ + ]
3999 : : {
4000 [ + + + - ]: 1716 : if (inbound_onion) assert(conn_type_in == ConnectionType::INBOUND);
4001 : :
4002 [ + + ]: 61776 : for (const auto& msg : ALL_NET_MESSAGE_TYPES) {
4003 [ + - ]: 60060 : mapRecvBytesPerMsgType[msg] = 0;
4004 : : }
4005 [ + - ]: 1716 : mapRecvBytesPerMsgType[NET_MESSAGE_TYPE_OTHER] = 0;
4006 : :
4007 [ + + ]: 1716 : if (fLogIPs) {
4008 [ + - + - : 9 : LogDebug(BCLog::NET, "Added connection to %s peer=%d\n", m_addr_name, id);
+ - ]
4009 : : } else {
4010 [ + - + - : 1707 : LogDebug(BCLog::NET, "Added connection peer=%d\n", id);
+ - ]
4011 : : }
4012 [ - - ]: 1716 : }
4013 : :
4014 : 146670 : void CNode::MarkReceivedMsgsForProcessing()
4015 : : {
4016 : 146670 : AssertLockNotHeld(m_msg_process_queue_mutex);
4017 : :
4018 : 146670 : size_t nSizeAdded = 0;
4019 [ + + ]: 309617 : for (const auto& msg : vRecvMsg) {
4020 : : // vRecvMsg contains only completed CNetMessage
4021 : : // the single possible partially deserialized message are held by TransportDeserializer
4022 : 162947 : nSizeAdded += msg.GetMemoryUsage();
4023 : : }
4024 : :
4025 : 146670 : LOCK(m_msg_process_queue_mutex);
4026 : 146670 : m_msg_process_queue.splice(m_msg_process_queue.end(), vRecvMsg);
4027 : 146670 : m_msg_process_queue_size += nSizeAdded;
4028 [ + - ]: 146670 : fPauseRecv = m_msg_process_queue_size > m_recv_flood_size;
4029 : 146670 : }
4030 : :
4031 : 430647 : std::optional<std::pair<CNetMessage, bool>> CNode::PollMessage()
4032 : : {
4033 : 430647 : LOCK(m_msg_process_queue_mutex);
4034 [ + + ]: 430647 : if (m_msg_process_queue.empty()) return std::nullopt;
4035 : :
4036 : 162814 : std::list<CNetMessage> msgs;
4037 : : // Just take one message
4038 : 162814 : msgs.splice(msgs.begin(), m_msg_process_queue, m_msg_process_queue.begin());
4039 : 162814 : m_msg_process_queue_size -= msgs.front().GetMemoryUsage();
4040 : 162814 : fPauseRecv = m_msg_process_queue_size > m_recv_flood_size;
4041 : :
4042 : 325628 : return std::make_pair(std::move(msgs.front()), !m_msg_process_queue.empty());
4043 : 162814 : }
4044 : :
4045 : 83484 : bool CConnman::NodeFullyConnected(const CNode* pnode)
4046 : : {
4047 [ + - + + : 83484 : return pnode && pnode->fSuccessfullyConnected && !pnode->fDisconnect;
+ + ]
4048 : : }
4049 : :
4050 : : /// Private broadcast connections only need to send certain message types.
4051 : : /// Other messages are not needed and may degrade privacy.
4052 : 50 : static bool IsOutboundMessageAllowedInPrivateBroadcast(std::string_view type) noexcept
4053 : : {
4054 : 90 : return type == NetMsgType::VERSION ||
4055 [ + + ]: 40 : type == NetMsgType::VERACK ||
4056 [ + + ]: 30 : type == NetMsgType::INV ||
4057 [ + + + + ]: 70 : type == NetMsgType::TX ||
4058 [ + - ]: 10 : type == NetMsgType::PING;
4059 : : }
4060 : :
4061 : 169220 : void CConnman::PushMessage(CNode* pnode, CSerializedNetMsg&& msg)
4062 : : {
4063 : 169220 : AssertLockNotHeld(m_total_bytes_sent_mutex);
4064 : :
4065 [ + + - + : 169220 : if (pnode->IsPrivateBroadcastConn() && !IsOutboundMessageAllowedInPrivateBroadcast(msg.m_type)) {
- + ]
4066 [ # # # # ]: 0 : LogDebug(BCLog::PRIVBROADCAST, "Omitting send of message '%s', %s", msg.m_type, pnode->LogPeer());
4067 : 0 : return;
4068 : : }
4069 : :
4070 [ + + + + : 169220 : if (!m_private_broadcast.m_outbound_tor_ok_at_least_once.load() && !pnode->IsInboundConn() &&
+ + ]
4071 [ + + + + : 241416 : pnode->addr.IsTor() && msg.m_type == NetMsgType::VERACK) {
+ + ]
4072 : : // If we are sending the peer VERACK that means we successfully sent
4073 : : // and received another message to/from that peer (VERSION).
4074 : 1 : m_private_broadcast.m_outbound_tor_ok_at_least_once.store(true);
4075 : : }
4076 : :
4077 [ - + ]: 169220 : size_t nMessageSize = msg.data.size();
4078 [ + - ]: 169220 : LogDebug(BCLog::NET, "sending %s (%d bytes) peer=%d\n", msg.m_type, nMessageSize, pnode->GetId());
4079 [ + + ]: 169220 : if (m_capture_messages) {
4080 [ - + ]: 20 : CaptureMessage(pnode->addr, msg.m_type, msg.data, /*is_incoming=*/false);
4081 : : }
4082 : :
4083 : : TRACEPOINT(net, outbound_message,
4084 : : pnode->GetId(),
4085 : : pnode->m_addr_name.c_str(),
4086 : : pnode->ConnectionTypeAsString().c_str(),
4087 : : msg.m_type.c_str(),
4088 : : msg.data.size(),
4089 : : msg.data.data()
4090 : 169220 : );
4091 : :
4092 : 169220 : size_t nBytesSent = 0;
4093 : 169220 : {
4094 : 169220 : LOCK(pnode->cs_vSend);
4095 : : // Check if the transport still has unsent bytes, and indicate to it that we're about to
4096 : : // give it a message to send.
4097 [ + + ]: 169220 : const auto& [to_send, more, _msg_type] =
4098 [ + + ]: 169220 : pnode->m_transport->GetBytesToSend(/*have_next_message=*/true);
4099 [ + + - + ]: 169220 : const bool queue_was_empty{to_send.empty() && pnode->vSendMsg.empty()};
4100 : :
4101 : : // Update memory usage of send buffer.
4102 : 169220 : pnode->m_send_memusage += msg.GetMemoryUsage();
4103 [ + + ]: 169220 : if (pnode->m_send_memusage + pnode->m_transport->GetSendMemoryUsage() > nSendBufferMaxSize) pnode->fPauseSend = true;
4104 : : // Move message to vSendMsg queue.
4105 [ + - ]: 169220 : pnode->vSendMsg.push_back(std::move(msg));
4106 : :
4107 : : // If there was nothing to send before, and there is now (predicted by the "more" value
4108 : : // returned by the GetBytesToSend call above), attempt "optimistic write":
4109 : : // because the poll/select loop may pause for SELECT_TIMEOUT_MILLISECONDS before actually
4110 : : // doing a send, try sending from the calling thread if the queue was empty before.
4111 : : // With a V1Transport, more will always be true here, because adding a message always
4112 : : // results in sendable bytes there, but with V2Transport this is not the case (it may
4113 : : // still be in the handshake).
4114 [ + + + + ]: 169220 : if (queue_was_empty && more) {
4115 [ + - ]: 168684 : std::tie(nBytesSent, std::ignore) = SocketSendData(*pnode);
4116 : : }
4117 : 169220 : }
4118 [ + + ]: 169220 : if (nBytesSent) RecordBytesSent(nBytesSent);
4119 : : }
4120 : :
4121 : 957 : bool CConnman::ForNode(NodeId id, std::function<bool(CNode* pnode)> func)
4122 : : {
4123 : 957 : CNode* found = nullptr;
4124 : 957 : LOCK(m_nodes_mutex);
4125 [ + + ]: 1287 : for (auto&& pnode : m_nodes) {
4126 [ + + ]: 1230 : if(pnode->GetId() == id) {
4127 : : found = pnode;
4128 : : break;
4129 : : }
4130 : : }
4131 [ + + + - : 958 : return found != nullptr && NodeFullyConnected(found) && func(found);
+ - + - +
+ + - ]
4132 : 957 : }
4133 : :
4134 : 5081 : CSipHasher CConnman::GetDeterministicRandomizer(uint64_t id) const
4135 : : {
4136 : 5081 : return CSipHasher(nSeed0, nSeed1).Write(id);
4137 : : }
4138 : :
4139 : 1676 : uint64_t CConnman::CalculateKeyedNetGroup(const CNetAddr& address) const
4140 : : {
4141 : 1676 : std::vector<unsigned char> vchNetGroup(m_netgroupman.GetGroup(address));
4142 : :
4143 [ + - + - : 3352 : return GetDeterministicRandomizer(RANDOMIZER_ID_NETGROUP).Write(vchNetGroup).Finalize();
+ - ]
4144 : 1676 : }
4145 : :
4146 : 7177 : void CConnman::PerformReconnections()
4147 : : {
4148 : 7177 : AssertLockNotHeld(m_reconnections_mutex);
4149 : 7177 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
4150 : 7183 : while (true) {
4151 : : // Move first element of m_reconnections to todo (avoiding an allocation inside the lock).
4152 [ + - ]: 7180 : decltype(m_reconnections) todo;
4153 : 7180 : {
4154 [ + - ]: 7180 : LOCK(m_reconnections_mutex);
4155 [ + + ]: 7180 : if (m_reconnections.empty()) break;
4156 [ + - ]: 3 : todo.splice(todo.end(), m_reconnections, m_reconnections.begin());
4157 : 7177 : }
4158 : :
4159 [ + - ]: 3 : auto& item = *todo.begin();
4160 [ + - ]: 3 : OpenNetworkConnection(item.addr_connect,
4161 : : // We only reconnect if the first attempt to connect succeeded at
4162 : : // connection time, but then failed after the CNode object was
4163 : : // created. Since we already know connecting is possible, do not
4164 : : // count failure to reconnect.
4165 : : /*fCountFailure=*/false,
4166 [ + - ]: 3 : std::move(item.grant),
4167 : 3 : item.destination.empty() ? nullptr : item.destination.c_str(),
4168 : : item.conn_type,
4169 [ + - ]: 3 : item.use_v2transport);
4170 : 3 : }
4171 : 7177 : }
4172 : :
4173 : 7 : void CConnman::ASMapHealthCheck()
4174 : : {
4175 : 7 : const std::vector<CAddress> v4_addrs{GetAddressesUnsafe(/*max_addresses=*/0, /*max_pct=*/0, Network::NET_IPV4, /*filtered=*/false)};
4176 [ + - ]: 7 : const std::vector<CAddress> v6_addrs{GetAddressesUnsafe(/*max_addresses=*/0, /*max_pct=*/0, Network::NET_IPV6, /*filtered=*/false)};
4177 : 7 : std::vector<CNetAddr> clearnet_addrs;
4178 [ - + - + : 7 : clearnet_addrs.reserve(v4_addrs.size() + v6_addrs.size());
+ - ]
4179 [ + - ]: 7 : std::transform(v4_addrs.begin(), v4_addrs.end(), std::back_inserter(clearnet_addrs),
4180 [ + - ]: 8 : [](const CAddress& addr) { return static_cast<CNetAddr>(addr); });
4181 [ + - ]: 7 : std::transform(v6_addrs.begin(), v6_addrs.end(), std::back_inserter(clearnet_addrs),
4182 [ # # ]: 0 : [](const CAddress& addr) { return static_cast<CNetAddr>(addr); });
4183 [ + - ]: 7 : m_netgroupman.ASMapHealthCheck(clearnet_addrs);
4184 : 7 : }
4185 : :
4186 : : // Dump binary message to file, with timestamp.
4187 : 23 : static void CaptureMessageToFile(const CAddress& addr,
4188 : : const std::string& msg_type,
4189 : : std::span<const unsigned char> data,
4190 : : bool is_incoming)
4191 : : {
4192 : : // Note: This function captures the message at the time of processing,
4193 : : // not at socket receive/send time.
4194 : : // This ensures that the messages are always in order from an application
4195 : : // layer (processing) perspective.
4196 : 23 : auto now = GetTime<std::chrono::microseconds>();
4197 : :
4198 : : // Windows folder names cannot include a colon
4199 : 23 : std::string clean_addr = addr.ToStringAddrPort();
4200 [ - + ]: 23 : std::replace(clean_addr.begin(), clean_addr.end(), ':', '_');
4201 : :
4202 [ - + + - : 138 : fs::path base_path = gArgs.GetDataDirNet() / "message_capture" / fs::u8path(clean_addr);
+ - + - ]
4203 [ + - ]: 23 : fs::create_directories(base_path);
4204 : :
4205 [ + + + - ]: 69 : fs::path path = base_path / (is_incoming ? "msgs_recv.dat" : "msgs_sent.dat");
4206 [ + - + - ]: 46 : AutoFile f{fsbridge::fopen(path, "ab")};
4207 : :
4208 [ + - ]: 23 : ser_writedata64(f, now.count());
4209 [ - + + - ]: 23 : f << std::span{msg_type};
4210 [ - + + + ]: 135 : for (auto i = msg_type.length(); i < CMessageHeader::MESSAGE_TYPE_SIZE; ++i) {
4211 [ + - ]: 224 : f << uint8_t{'\0'};
4212 : : }
4213 [ + - ]: 23 : uint32_t size = data.size();
4214 [ + - ]: 23 : ser_writedata32(f, size);
4215 [ + - ]: 23 : f << data;
4216 : :
4217 [ + - - + ]: 46 : if (f.fclose() != 0) {
4218 : 0 : throw std::ios_base::failure(
4219 [ # # # # : 0 : strprintf("Error closing %s after write, file contents are likely incomplete", fs::PathToString(path)));
# # ]
4220 : : }
4221 : 69 : }
4222 : :
4223 : : std::function<void(const CAddress& addr,
4224 : : const std::string& msg_type,
4225 : : std::span<const unsigned char> data,
4226 : : bool is_incoming)>
4227 : : CaptureMessage = CaptureMessageToFile;
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