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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 : 64 : size_t CSerializedNetMsg::GetMemoryUsage() const noexcept
123 : : {
124 [ - + ]: 64 : return sizeof(*this) + memusage::DynamicUsage(m_type) + memusage::DynamicUsage(data);
125 : : }
126 : :
127 : 10 : size_t CNetMessage::GetMemoryUsage() const noexcept
128 : : {
129 : 10 : return sizeof(*this) + memusage::DynamicUsage(m_type) + m_recv.GetMemoryUsage();
130 : : }
131 : :
132 : 0 : void CConnman::AddAddrFetch(const std::string& strDest)
133 : : {
134 : 0 : LOCK(m_addr_fetches_mutex);
135 [ # # ]: 0 : m_addr_fetches.push_back(strDest);
136 : 0 : }
137 : :
138 : 28 : uint16_t GetListenPort()
139 : : {
140 : : // If -bind= is provided with ":port" part, use that (first one if multiple are provided).
141 [ + - + + ]: 28 : for (const std::string& bind_arg : gArgs.GetArgs("-bind")) {
142 : 3 : constexpr uint16_t dummy_port = 0;
143 : :
144 [ + - + - ]: 3 : const std::optional<CService> bind_addr{Lookup(bind_arg, dummy_port, /*fAllowLookup=*/false)};
145 [ + - + - : 3 : if (bind_addr.has_value() && bind_addr->GetPort() != dummy_port) return bind_addr->GetPort();
+ - + - ]
146 : 28 : }
147 : :
148 : : // Otherwise, if -whitebind= without NetPermissionFlags::NoBan is provided, use that
149 : : // (-whitebind= is required to have ":port").
150 [ + - - + ]: 25 : for (const std::string& whitebind_arg : gArgs.GetArgs("-whitebind")) {
151 [ # # ]: 0 : NetWhitebindPermissions whitebind;
152 [ # # ]: 0 : bilingual_str error;
153 [ # # # # ]: 0 : if (NetWhitebindPermissions::TryParse(whitebind_arg, whitebind, error)) {
154 [ # # ]: 0 : if (!NetPermissions::HasFlag(whitebind.m_flags, NetPermissionFlags::NoBan)) {
155 [ # # ]: 0 : return whitebind.m_service.GetPort();
156 : : }
157 : : }
158 : 0 : }
159 : :
160 : : // Otherwise, if -port= is provided, use that. Otherwise use the default port.
161 : 50 : return static_cast<uint16_t>(gArgs.GetIntArg("-port", Params().GetDefaultPort()));
162 : : }
163 : :
164 : : // Determine the "best" local address for a particular peer.
165 : 25 : [[nodiscard]] static std::optional<CService> GetLocal(const CNode& peer)
166 : : {
167 [ - + ]: 25 : if (!fListen) return std::nullopt;
168 : :
169 : 25 : std::optional<CService> addr;
170 : 25 : int nBestScore = -1;
171 : 25 : int nBestReachability = -1;
172 : 25 : {
173 [ + - ]: 25 : LOCK(g_maplocalhost_mutex);
174 [ + - + + ]: 96 : 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 [ + - + - ]: 71 : if (local_addr.GetNetwork() != peer.ConnectedThroughNetwork()
179 [ + + + - : 104 : && (local_addr.IsPrivacyNet() || peer.IsConnectedThroughPrivacyNet())) {
+ + ]
180 : 36 : continue;
181 : : }
182 : 35 : const int nScore{local_service_info.nScore};
183 [ + - ]: 35 : const int nReachability{local_addr.GetReachabilityFrom(peer.addr)};
184 [ + + - + ]: 35 : if (nReachability > nBestReachability || (nReachability == nBestReachability && nScore > nBestScore)) {
185 [ + - ]: 18 : addr.emplace(CService{local_addr, local_service_info.nPort});
186 : 18 : nBestReachability = nReachability;
187 : 18 : nBestScore = nScore;
188 : : }
189 : : }
190 : 0 : }
191 [ + + ]: 40 : return addr;
192 : 25 : }
193 : :
194 : : //! Convert the serialized seeds into usable address objects.
195 : 0 : 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 : 0 : const auto one_week{7 * 24h};
202 : 0 : std::vector<CAddress> vSeedsOut;
203 : 0 : FastRandomContext rng;
204 [ # # ]: 0 : ParamsStream s{SpanReader{vSeedsIn}, CAddress::V2_NETWORK};
205 [ # # ]: 0 : 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 : 0 : return vSeedsOut;
214 : 0 : }
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 : 25 : CService GetLocalAddress(const CNode& peer)
221 : : {
222 [ + - + - : 25 : 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 : 4 : [[nodiscard]] static bool IsPeerAddrLocalGood(CNode *pnode)
234 : : {
235 : 4 : CService addrLocal = pnode->GetAddrLocal();
236 [ + - + - : 8 : return fDiscover && pnode->addr.IsRoutable() && addrLocal.IsRoutable() &&
+ - + - +
- - + ]
237 [ + - ]: 8 : g_reachable_nets.Contains(addrLocal);
238 : 4 : }
239 : :
240 : 4 : std::optional<CService> GetLocalAddrForPeer(CNode& node)
241 : : {
242 : 4 : 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 : 4 : FastRandomContext rng;
247 [ + - + - : 4 : 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 [ + - + - ]: 4 : if (addrLocal.IsRoutable()) {
263 [ + - + - : 4 : LogDebug(BCLog::NET, "Advertising address %s to peer=%d\n", addrLocal.ToStringAddrPort(), node.GetId());
+ - + - ]
264 : 4 : return addrLocal;
265 : : }
266 : : // Address is unroutable. Don't advertise.
267 : 0 : return std::nullopt;
268 : 4 : }
269 : :
270 : 680 : void ClearLocal()
271 : : {
272 : 680 : LOCK(g_maplocalhost_mutex);
273 [ + - ]: 680 : return mapLocalHost.clear();
274 : 680 : }
275 : :
276 : : // learn a new local address
277 : 12 : bool AddLocal(const CService& addr_, int nScore)
278 : : {
279 : 12 : CService addr{MaybeFlipIPv6toCJDNS(addr_)};
280 : :
281 [ + - + + ]: 12 : if (!addr.IsRoutable())
282 : : return false;
283 : :
284 [ - + - - ]: 11 : if (!fDiscover && nScore < LOCAL_MANUAL)
285 : : return false;
286 : :
287 [ + - + - ]: 11 : if (!g_reachable_nets.Contains(addr))
288 : : return false;
289 : :
290 [ - + ]: 11 : if (fLogIPs) {
291 [ # # # # ]: 0 : LogInfo("AddLocal(%s,%i)\n", addr.ToStringAddrPort(), nScore);
292 : : }
293 : :
294 : 11 : {
295 [ + - ]: 11 : LOCK(g_maplocalhost_mutex);
296 [ + - - + ]: 11 : const auto [it, is_newly_added] = mapLocalHost.emplace(addr, LocalServiceInfo());
297 [ - + ]: 11 : LocalServiceInfo &info = it->second;
298 [ - + - - ]: 11 : if (is_newly_added || nScore >= info.nScore) {
299 [ - + ]: 11 : info.nScore = nScore + (is_newly_added ? 0 : 1);
300 [ + - ]: 11 : info.nPort = addr.GetPort();
301 : : }
302 : 0 : }
303 : :
304 : 11 : return true;
305 : 12 : }
306 : :
307 : 1 : bool AddLocal(const CNetAddr &addr, int nScore)
308 : : {
309 [ + - ]: 1 : return AddLocal(CService(addr, GetListenPort()), nScore);
310 : : }
311 : :
312 : 11 : void RemoveLocal(const CService& addr)
313 : : {
314 : 11 : LOCK(g_maplocalhost_mutex);
315 [ - + ]: 11 : if (fLogIPs) {
316 [ # # # # ]: 0 : LogInfo("RemoveLocal(%s)\n", addr.ToStringAddrPort());
317 : : }
318 : :
319 [ + - + - ]: 11 : mapLocalHost.erase(addr);
320 : 11 : }
321 : :
322 : : /** vote for a local address */
323 : 0 : bool SeenLocal(const CService& addr)
324 : : {
325 : 0 : LOCK(g_maplocalhost_mutex);
326 [ # # ]: 0 : const auto it = mapLocalHost.find(addr);
327 [ # # ]: 0 : if (it == mapLocalHost.end()) return false;
328 : 0 : ++it->second.nScore;
329 : 0 : return true;
330 : 0 : }
331 : :
332 : :
333 : : /** check whether a given address is potentially local */
334 : 3 : bool IsLocal(const CService& addr)
335 : : {
336 : 3 : LOCK(g_maplocalhost_mutex);
337 [ + - + - ]: 3 : return mapLocalHost.contains(addr);
338 : 3 : }
339 : :
340 : 0 : bool CConnman::AlreadyConnectedToHost(std::string_view host) const
341 : : {
342 : 0 : LOCK(m_nodes_mutex);
343 [ # # # # ]: 0 : return std::ranges::any_of(m_nodes, [&host](CNode* node) { return node->m_addr_name == host; });
344 : 0 : }
345 : :
346 : 10 : bool CConnman::AlreadyConnectedToAddressPort(const CService& addr_port) const
347 : : {
348 : 10 : LOCK(m_nodes_mutex);
349 [ + - + - ]: 20 : return std::ranges::any_of(m_nodes, [&addr_port](CNode* node) { return node->addr == addr_port; });
350 : 10 : }
351 : :
352 : 6 : bool CConnman::AlreadyConnectedToAddress(const CNetAddr& addr) const
353 : : {
354 : 6 : LOCK(m_nodes_mutex);
355 [ + - + - ]: 27 : return std::ranges::any_of(m_nodes, [&addr](CNode* node) { return node->addr == addr; });
356 : 6 : }
357 : :
358 : 0 : bool CConnman::CheckIncomingNonce(uint64_t nonce)
359 : : {
360 : 0 : LOCK(m_nodes_mutex);
361 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
362 : : // Omit private broadcast connections from this check to prevent this privacy attack:
363 : : // - We connect to a peer in an attempt to privately broadcast a transaction. From our
364 : : // VERSION message the peer deducts that this is a short-lived connection for
365 : : // broadcasting a transaction, takes our nonce and delays their VERACK.
366 : : // - The peer starts connecting to (clearnet) nodes and sends them a VERSION message
367 : : // which contains our nonce. If the peer manages to connect to us we would disconnect.
368 : : // - Upon a disconnect, the peer knows our clearnet address. They go back to the short
369 : : // lived privacy broadcast connection and continue with VERACK.
370 [ # # # # : 0 : if (!pnode->fSuccessfullyConnected && !pnode->IsInboundConn() && !pnode->IsPrivateBroadcastConn() &&
# # ]
371 [ # # ]: 0 : pnode->GetLocalNonce() == nonce)
372 : : return false;
373 : : }
374 : : return true;
375 : 0 : }
376 : :
377 : 10 : CNode* CConnman::ConnectNode(CAddress addrConnect,
378 : : const char* pszDest,
379 : : bool fCountFailure,
380 : : ConnectionType conn_type,
381 : : bool use_v2transport,
382 : : const std::optional<Proxy>& proxy_override)
383 : : {
384 : 10 : AssertLockNotHeld(m_nodes_mutex);
385 : 10 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
386 [ - + ]: 10 : assert(conn_type != ConnectionType::INBOUND);
387 : :
388 [ - + ]: 10 : if (pszDest == nullptr) {
389 [ # # ]: 0 : if (IsLocal(addrConnect))
390 : : return nullptr;
391 : :
392 : : // Look for an existing connection
393 [ # # ]: 0 : if (AlreadyConnectedToAddressPort(addrConnect)) {
394 [ # # ]: 0 : LogInfo("Failed to open new connection to %s, already connected", addrConnect.ToStringAddrPort());
395 : 0 : return nullptr;
396 : : }
397 : : }
398 : :
399 [ + - + - : 10 : LogDebug(BCLog::NET, "trying %s connection (%s) to %s, lastseen=%.1fhrs\n",
+ - + - -
+ + - ]
400 : : use_v2transport ? "v2" : "v1",
401 : : ConnectionTypeAsString(conn_type),
402 : : pszDest ? pszDest : addrConnect.ToStringAddrPort(),
403 : : Ticks<HoursDouble>(pszDest ? 0h : Now<NodeSeconds>() - addrConnect.nTime));
404 : :
405 : : // Resolve
406 [ + - + - ]: 20 : const uint16_t default_port{pszDest != nullptr ? GetDefaultPort(pszDest) :
407 : 0 : m_params.GetDefaultPort()};
408 : :
409 : : // Collection of addresses to try to connect to: either all dns resolved addresses if a domain name (pszDest) is provided, or addrConnect otherwise.
410 : 10 : std::vector<CAddress> connect_to{};
411 [ + - ]: 10 : if (pszDest) {
412 [ + - + - : 20 : std::vector<CService> resolved{Lookup(pszDest, default_port, fNameLookup && !HaveNameProxy(), 256)};
+ - - + +
- + - ]
413 [ + - ]: 10 : if (!resolved.empty()) {
414 : 10 : std::shuffle(resolved.begin(), resolved.end(), FastRandomContext());
415 : : // If the connection is made by name, it can be the case that the name resolves to more than one address.
416 : : // We don't want to connect any more of them if we are already connected to one
417 [ + - ]: 10 : for (const auto& r : resolved) {
418 [ + - ]: 20 : addrConnect = CAddress{MaybeFlipIPv6toCJDNS(r), NODE_NONE};
419 [ + - - + ]: 10 : if (!addrConnect.IsValid()) {
420 [ # # # # : 0 : LogDebug(BCLog::NET, "Resolver returned invalid address %s for %s\n", addrConnect.ToStringAddrPort(), pszDest);
# # # # ]
421 : 0 : return nullptr;
422 : : }
423 : : // It is possible that we already have a connection to the IP/port pszDest resolved to.
424 : : // In that case, drop the connection that was just created.
425 [ + - + - ]: 10 : if (AlreadyConnectedToAddressPort(addrConnect)) {
426 [ + - + - ]: 10 : LogInfo("Not opening a connection to %s, already connected to %s\n", pszDest, addrConnect.ToStringAddrPort());
427 : 10 : return nullptr;
428 : : }
429 : : // Add the address to the resolved addresses vector so we can try to connect to it later on
430 [ # # ]: 0 : connect_to.push_back(addrConnect);
431 : : }
432 : : } else {
433 : : // For resolution via proxy
434 [ # # ]: 0 : connect_to.push_back(addrConnect);
435 : : }
436 : 10 : } else {
437 : : // Connect via addrConnect directly
438 [ # # ]: 0 : connect_to.push_back(addrConnect);
439 : : }
440 : :
441 : : // Connect
442 : 0 : std::unique_ptr<Sock> sock;
443 [ # # ]: 0 : CService addr_bind;
444 [ # # # # ]: 0 : assert(!addr_bind.IsValid());
445 : 0 : std::unique_ptr<i2p::sam::Session> i2p_transient_session;
446 : :
447 [ # # ]: 0 : for (auto& target_addr : connect_to) {
448 [ # # # # ]: 0 : if (target_addr.IsValid()) {
449 [ # # ]: 0 : const std::optional<Proxy> use_proxy{
450 [ # # ]: 0 : proxy_override.has_value() ? proxy_override : GetProxy(target_addr.GetNetwork()),
451 [ # # # # ]: 0 : };
452 : 0 : bool proxyConnectionFailed = false;
453 : :
454 [ # # # # ]: 0 : if (target_addr.IsI2P() && use_proxy) {
455 [ # # ]: 0 : i2p::Connection conn;
456 : 0 : bool connected{false};
457 : :
458 : : // If an I2P SAM session already exists, normally we would re-use it. But in the case of
459 : : // private broadcast we force a new transient session. A Connect() using m_i2p_sam_session
460 : : // would use our permanent I2P address as a source address.
461 [ # # # # ]: 0 : if (m_i2p_sam_session && conn_type != ConnectionType::PRIVATE_BROADCAST) {
462 [ # # ]: 0 : connected = m_i2p_sam_session->Connect(target_addr, conn, proxyConnectionFailed);
463 : : } else {
464 : 0 : {
465 [ # # ]: 0 : LOCK(m_unused_i2p_sessions_mutex);
466 [ # # ]: 0 : if (m_unused_i2p_sessions.empty()) {
467 : 0 : i2p_transient_session =
468 [ # # ]: 0 : std::make_unique<i2p::sam::Session>(*use_proxy, m_interrupt_net);
469 : : } else {
470 : 0 : i2p_transient_session.swap(m_unused_i2p_sessions.front());
471 : 0 : m_unused_i2p_sessions.pop();
472 : : }
473 : 0 : }
474 [ # # ]: 0 : connected = i2p_transient_session->Connect(target_addr, conn, proxyConnectionFailed);
475 [ # # ]: 0 : if (!connected) {
476 [ # # ]: 0 : LOCK(m_unused_i2p_sessions_mutex);
477 [ # # # # ]: 0 : if (m_unused_i2p_sessions.size() < MAX_UNUSED_I2P_SESSIONS_SIZE) {
478 [ # # # # ]: 0 : m_unused_i2p_sessions.emplace(i2p_transient_session.release());
479 : : }
480 : 0 : }
481 : : }
482 : :
483 [ # # ]: 0 : if (connected) {
484 : 0 : sock = std::move(conn.sock);
485 : 0 : addr_bind = conn.me;
486 : : }
487 [ # # ]: 0 : } else if (use_proxy) {
488 [ # # # # : 0 : LogDebug(BCLog::PROXY, "Using proxy: %s to connect to %s\n", use_proxy->ToString(), target_addr.ToStringAddrPort());
# # # # #
# ]
489 [ # # # # : 0 : sock = ConnectThroughProxy(*use_proxy, target_addr.ToStringAddr(), target_addr.GetPort(), proxyConnectionFailed);
# # ]
490 : : } else {
491 : : // No proxy needed (none set for target network). Private broadcast connections
492 : : // must always use a proxy, otherwise they would leak the originator's IP address.
493 [ # # ]: 0 : if (Assume(conn_type != ConnectionType::PRIVATE_BROADCAST)) {
494 [ # # ]: 0 : sock = ConnectDirectly(target_addr, conn_type == ConnectionType::MANUAL);
495 : : }
496 : : }
497 [ # # ]: 0 : if (!proxyConnectionFailed) {
498 : : // If a connection to the node was attempted, and failure (if any) is not caused by a problem connecting to
499 : : // the proxy, mark this as an attempt.
500 [ # # ]: 0 : addrman.get().Attempt(target_addr, fCountFailure);
501 : : }
502 [ # # ]: 0 : } else if (pszDest) {
503 [ # # # # ]: 0 : if (const auto name_proxy = GetNameProxy()) {
504 [ # # ]: 0 : std::string host;
505 : 0 : uint16_t port{default_port};
506 [ # # ]: 0 : SplitHostPort(pszDest, port, host);
507 : 0 : bool proxyConnectionFailed;
508 [ # # ]: 0 : sock = ConnectThroughProxy(*name_proxy, host, port, proxyConnectionFailed);
509 : 0 : }
510 : : }
511 : : // Check any other resolved address (if any) if we fail to connect
512 [ # # ]: 0 : if (!sock) {
513 : 0 : continue;
514 : : }
515 : :
516 : 0 : NetPermissionFlags permission_flags = NetPermissionFlags::None;
517 [ # # # # ]: 0 : std::vector<NetWhitelistPermissions> whitelist_permissions = conn_type == ConnectionType::MANUAL ? vWhitelistedRangeOutgoing : std::vector<NetWhitelistPermissions>{};
518 [ # # ]: 0 : AddWhitelistPermissionFlags(permission_flags, target_addr, whitelist_permissions);
519 : :
520 : : // Add node
521 [ # # ]: 0 : NodeId id = GetNewNodeId();
522 [ # # # # : 0 : uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
# # ]
523 [ # # # # ]: 0 : if (!addr_bind.IsValid()) {
524 [ # # ]: 0 : addr_bind = GetBindAddress(*sock);
525 : : }
526 [ # # ]: 0 : uint64_t network_id = GetDeterministicRandomizer(RANDOMIZER_ID_NETWORKKEY)
527 [ # # # # ]: 0 : .Write(target_addr.GetNetClass())
528 [ # # # # ]: 0 : .Write(addr_bind.GetAddrBytes())
529 : : // For outbound connections, the port of the bound address is randomly
530 : : // assigned by the OS and would therefore not be useful for seeding.
531 [ # # ]: 0 : .Write(0)
532 [ # # ]: 0 : .Finalize();
533 : 0 : CNode* pnode = new CNode(id,
534 : 0 : std::move(sock),
535 : : target_addr,
536 : : CalculateKeyedNetGroup(target_addr),
537 : : nonce,
538 : : addr_bind,
539 [ # # ]: 0 : pszDest ? pszDest : "",
540 : : conn_type,
541 : : /*inbound_onion=*/false,
542 : : network_id,
543 [ # # # # ]: 0 : CNodeOptions{
544 : : .permission_flags = permission_flags,
545 : : .proxy_override = proxy_override,
546 : : .i2p_sam_session = std::move(i2p_transient_session),
547 [ # # ]: 0 : .recv_flood_size = nReceiveFloodSize,
548 : : .use_v2transport = use_v2transport,
549 [ # # # # : 0 : });
# # # # #
# ]
550 : 0 : pnode->AddRef();
551 : :
552 : : // We're making a new connection, harvest entropy from the time (and our peer count)
553 : 0 : RandAddEvent((uint32_t)id);
554 : :
555 : 0 : return pnode;
556 : 0 : }
557 : :
558 : : return nullptr;
559 : 10 : }
560 : :
561 : 0 : void CNode::CloseSocketDisconnect()
562 : : {
563 : 0 : fDisconnect = true;
564 : 0 : LOCK(m_sock_mutex);
565 [ # # ]: 0 : if (m_sock) {
566 [ # # # # : 0 : LogDebug(BCLog::NET, "Resetting socket for %s", LogPeer());
# # # # ]
567 : 0 : m_sock.reset();
568 : :
569 : : TRACEPOINT(net, closed_connection,
570 : : GetId(),
571 : : m_addr_name.c_str(),
572 : : ConnectionTypeAsString().c_str(),
573 : : ConnectedThroughNetwork(),
574 : 0 : TicksSinceEpoch<std::chrono::seconds>(m_connected));
575 : : }
576 [ # # # # ]: 0 : m_i2p_sam_session.reset();
577 : 0 : }
578 : :
579 : 0 : void CConnman::AddWhitelistPermissionFlags(NetPermissionFlags& flags, std::optional<CNetAddr> addr, const std::vector<NetWhitelistPermissions>& ranges) const {
580 [ # # ]: 0 : for (const auto& subnet : ranges) {
581 [ # # # # ]: 0 : if (addr.has_value() && subnet.m_subnet.Match(addr.value())) {
582 : 0 : NetPermissions::AddFlag(flags, subnet.m_flags);
583 : : }
584 : : }
585 [ # # ]: 0 : if (NetPermissions::HasFlag(flags, NetPermissionFlags::Implicit)) {
586 [ # # ]: 0 : NetPermissions::ClearFlag(flags, NetPermissionFlags::Implicit);
587 [ # # ]: 0 : if (whitelist_forcerelay) NetPermissions::AddFlag(flags, NetPermissionFlags::ForceRelay);
588 [ # # ]: 0 : if (whitelist_relay) NetPermissions::AddFlag(flags, NetPermissionFlags::Relay);
589 : 0 : NetPermissions::AddFlag(flags, NetPermissionFlags::Mempool);
590 : 0 : NetPermissions::AddFlag(flags, NetPermissionFlags::NoBan);
591 : : }
592 : 0 : }
593 : :
594 : 8 : CService CNode::GetAddrLocal() const
595 : : {
596 : 8 : AssertLockNotHeld(m_addr_local_mutex);
597 : 8 : LOCK(m_addr_local_mutex);
598 [ + - ]: 8 : return m_addr_local;
599 : 8 : }
600 : :
601 : 5 : void CNode::SetAddrLocal(const CService& addrLocalIn) {
602 : 5 : AssertLockNotHeld(m_addr_local_mutex);
603 : 5 : LOCK(m_addr_local_mutex);
604 [ + - + - ]: 5 : if (Assume(!m_addr_local.IsValid())) { // Addr local can only be set once during version msg processing
605 : 5 : m_addr_local = addrLocalIn;
606 : : }
607 : 5 : }
608 : :
609 : 76 : Network CNode::ConnectedThroughNetwork() const
610 : : {
611 [ + + ]: 76 : return m_inbound_onion ? NET_ONION : addr.GetNetClass();
612 : : }
613 : :
614 : 33 : bool CNode::IsConnectedThroughPrivacyNet() const
615 : : {
616 [ + - + + ]: 33 : return m_inbound_onion || addr.IsPrivacyNet();
617 : : }
618 : :
619 : : #undef X
620 : : #define X(name) stats.name = name
621 : 0 : void CNode::CopyStats(CNodeStats& stats)
622 : : {
623 : 0 : stats.nodeid = this->GetId();
624 : 0 : X(addr);
625 : 0 : X(addrBind);
626 : 0 : stats.m_network = ConnectedThroughNetwork();
627 : 0 : X(m_last_send);
628 : 0 : X(m_last_recv);
629 : 0 : X(m_last_tx_time);
630 : 0 : X(m_last_block_time);
631 : 0 : X(m_connected);
632 : 0 : X(m_addr_name);
633 : 0 : X(nVersion);
634 : 0 : {
635 : 0 : LOCK(m_subver_mutex);
636 [ # # # # ]: 0 : X(cleanSubVer);
637 : 0 : }
638 : 0 : stats.fInbound = IsInboundConn();
639 : 0 : X(m_bip152_highbandwidth_to);
640 : 0 : X(m_bip152_highbandwidth_from);
641 : 0 : {
642 : 0 : LOCK(cs_vSend);
643 [ # # ]: 0 : X(mapSendBytesPerMsgType);
644 [ # # ]: 0 : X(nSendBytes);
645 : 0 : }
646 : 0 : {
647 : 0 : LOCK(cs_vRecv);
648 [ # # ]: 0 : X(mapRecvBytesPerMsgType);
649 : 0 : X(nRecvBytes);
650 : 0 : Transport::Info info = m_transport->GetInfo();
651 : 0 : stats.m_transport_type = info.transport_type;
652 [ # # # # ]: 0 : if (info.session_id) stats.m_session_id = HexStr(*info.session_id);
653 : 0 : }
654 : 0 : X(m_permission_flags);
655 : :
656 : 0 : X(m_last_ping_time);
657 : 0 : X(m_min_ping_time);
658 : :
659 : : // Leave string empty if addrLocal invalid (not filled in yet)
660 : 0 : CService addrLocalUnlocked = GetAddrLocal();
661 [ # # # # : 0 : stats.addrLocal = addrLocalUnlocked.IsValid() ? addrLocalUnlocked.ToStringAddrPort() : "";
# # # # ]
662 : :
663 : 0 : X(m_conn_type);
664 : 0 : }
665 : : #undef X
666 : :
667 : 8 : bool CNode::ReceiveMsgBytes(std::span<const uint8_t> msg_bytes, bool& complete)
668 : : {
669 : 8 : complete = false;
670 : 8 : const auto time{NodeClock::now()};
671 : 8 : LOCK(cs_vRecv);
672 : 8 : m_last_recv = time;
673 : 8 : nRecvBytes += msg_bytes.size();
674 [ + + ]: 24 : while (msg_bytes.size() > 0) {
675 : : // absorb network data
676 [ + - + - ]: 8 : if (!m_transport->ReceivedBytes(msg_bytes)) {
677 : : // Serious transport problem, disconnect from the peer.
678 : : return false;
679 : : }
680 : :
681 [ + - + + ]: 8 : if (m_transport->ReceivedMessageComplete()) {
682 : : // decompose a transport agnostic CNetMessage from the deserializer
683 : 5 : bool reject_message{false};
684 [ + - ]: 5 : CNetMessage msg = m_transport->GetReceivedMessage(time, reject_message);
685 [ - + ]: 5 : if (reject_message) {
686 : : // Message deserialization failed. Drop the message but don't disconnect the peer.
687 : : // store the size of the corrupt message
688 [ # # ]: 0 : mapRecvBytesPerMsgType.at(NET_MESSAGE_TYPE_OTHER) += msg.m_raw_message_size;
689 : 0 : continue;
690 : : }
691 : :
692 : : // Store received bytes per message type.
693 : : // To prevent a memory DOS, only allow known message types.
694 : 5 : auto i = mapRecvBytesPerMsgType.find(msg.m_type);
695 [ - + ]: 5 : if (i == mapRecvBytesPerMsgType.end()) {
696 : 0 : i = mapRecvBytesPerMsgType.find(NET_MESSAGE_TYPE_OTHER);
697 : : }
698 [ - + ]: 5 : assert(i != mapRecvBytesPerMsgType.end());
699 [ + - ]: 5 : i->second += msg.m_raw_message_size;
700 : :
701 : : // push the message to the process queue,
702 [ + - ]: 5 : vRecvMsg.push_back(std::move(msg));
703 : :
704 : 5 : complete = true;
705 : 5 : }
706 : : }
707 : :
708 : : return true;
709 : 8 : }
710 : :
711 : 9 : std::string CNode::LogPeer() const
712 : : {
713 : 9 : auto peer_info{strprintf("peer=%d", GetId())};
714 [ - + ]: 9 : if (fLogIPs) {
715 [ # # # # ]: 0 : return strprintf("%s, peeraddr=%s", peer_info, addr.ToStringAddrPort());
716 : : } else {
717 : 9 : return peer_info;
718 : : }
719 : 9 : }
720 : :
721 : 5 : std::string CNode::DisconnectMsg() const
722 : : {
723 [ + - ]: 10 : return strprintf("disconnecting %s", LogPeer());
724 : : }
725 : :
726 : 116 : V1Transport::V1Transport(const NodeId node_id) noexcept
727 : 116 : : m_magic_bytes{Params().MessageStart()}, m_node_id{node_id}
728 : : {
729 : 116 : LOCK(m_recv_mutex);
730 [ + - ]: 116 : Reset();
731 : 116 : }
732 : :
733 : 2 : Transport::Info V1Transport::GetInfo() const noexcept
734 : : {
735 : 2 : return {.transport_type = TransportProtocolType::V1, .session_id = {}};
736 : : }
737 : :
738 : 8 : int V1Transport::readHeader(std::span<const uint8_t> msg_bytes)
739 : : {
740 : 8 : AssertLockHeld(m_recv_mutex);
741 : : // copy data to temporary parsing buffer
742 : 8 : unsigned int nRemaining = CMessageHeader::HEADER_SIZE - nHdrPos;
743 [ + + ]: 8 : unsigned int nCopy = std::min<unsigned int>(nRemaining, msg_bytes.size());
744 : :
745 [ + + ]: 8 : memcpy(&hdrbuf[nHdrPos], msg_bytes.data(), nCopy);
746 : 8 : nHdrPos += nCopy;
747 : :
748 : : // if header incomplete, exit
749 [ + + ]: 8 : if (nHdrPos < CMessageHeader::HEADER_SIZE)
750 : 2 : return nCopy;
751 : :
752 : : // deserialize to CMessageHeader
753 : 6 : try {
754 [ + - ]: 6 : hdrbuf >> hdr;
755 : : }
756 [ - - ]: 0 : catch (const std::exception&) {
757 [ - - - - : 0 : LogDebug(BCLog::NET, "Header error: Unable to deserialize, peer=%d\n", m_node_id);
- - ]
758 : 0 : return -1;
759 : 0 : }
760 : :
761 : : // Check start string, network magic
762 [ - + ]: 6 : if (hdr.pchMessageStart != m_magic_bytes) {
763 [ # # # # ]: 0 : LogDebug(BCLog::NET, "Header error: Wrong MessageStart %s received, peer=%d\n", HexStr(hdr.pchMessageStart), m_node_id);
764 : 0 : return -1;
765 : : }
766 : :
767 : : // reject messages larger than MAX_SIZE or MAX_PROTOCOL_MESSAGE_LENGTH
768 : : // NOTE: failing to perform this check previously allowed a malicious peer to make us allocate 32MiB of memory per
769 : : // connection. See https://bitcoincore.org/en/2024/07/03/disclose_receive_buffer_oom.
770 [ - + ]: 6 : if (hdr.nMessageSize > MAX_SIZE || hdr.nMessageSize > MAX_PROTOCOL_MESSAGE_LENGTH) {
771 [ # # # # : 0 : LogDebug(BCLog::NET, "Header error: Size too large (%s, %u bytes), peer=%d\n", SanitizeString(hdr.GetMessageType()), hdr.nMessageSize, m_node_id);
# # # # ]
772 : 0 : return -1;
773 : : }
774 : :
775 : : // switch state to reading message data
776 : 6 : in_data = true;
777 : :
778 : 6 : return nCopy;
779 : : }
780 : :
781 : 3 : int V1Transport::readData(std::span<const uint8_t> msg_bytes)
782 : : {
783 : 3 : AssertLockHeld(m_recv_mutex);
784 : 3 : unsigned int nRemaining = hdr.nMessageSize - nDataPos;
785 [ + - ]: 3 : unsigned int nCopy = std::min<unsigned int>(nRemaining, msg_bytes.size());
786 : :
787 [ - + + - ]: 3 : if (vRecv.size() < nDataPos + nCopy) {
788 : : // Allocate up to 256 KiB ahead, but never more than the total message size.
789 [ + - ]: 6 : vRecv.resize(std::min(hdr.nMessageSize, nDataPos + nCopy + 256 * 1024));
790 : : }
791 : :
792 : 3 : hasher.Write(msg_bytes.first(nCopy));
793 : 3 : memcpy(&vRecv[nDataPos], msg_bytes.data(), nCopy);
794 : 3 : nDataPos += nCopy;
795 : :
796 : 3 : return nCopy;
797 : : }
798 : :
799 : 5 : const uint256& V1Transport::GetMessageHash() const
800 : : {
801 : 5 : AssertLockHeld(m_recv_mutex);
802 [ + - - + ]: 5 : assert(CompleteInternal());
803 [ + - ]: 10 : if (data_hash.IsNull())
804 : 5 : hasher.Finalize(data_hash);
805 : 5 : return data_hash;
806 : : }
807 : :
808 : 5 : CNetMessage V1Transport::GetReceivedMessage(NodeClock::time_point time, bool& reject_message)
809 : : {
810 : 5 : AssertLockNotHeld(m_recv_mutex);
811 : : // Initialize out parameter
812 : 5 : reject_message = false;
813 : : // decompose a single CNetMessage from the TransportDeserializer
814 : 5 : LOCK(m_recv_mutex);
815 [ + - ]: 5 : CNetMessage msg(std::move(vRecv));
816 : :
817 : : // store message type string, time, and sizes
818 [ + - ]: 5 : msg.m_type = hdr.GetMessageType();
819 : 5 : msg.m_time = time;
820 : 5 : msg.m_message_size = hdr.nMessageSize;
821 : 5 : msg.m_raw_message_size = hdr.nMessageSize + CMessageHeader::HEADER_SIZE;
822 : :
823 [ + - ]: 5 : uint256 hash = GetMessageHash();
824 : :
825 : : // We just received a message off the wire, harvest entropy from the time (and the message checksum)
826 : 5 : RandAddEvent(ReadLE32(hash.begin()));
827 : :
828 : : // Check checksum and header message type string
829 [ - + ]: 5 : if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) {
830 [ # # # # : 0 : LogDebug(BCLog::NET, "Header error: Wrong checksum (%s, %u bytes), expected %s was %s, peer=%d\n",
# # # # #
# # # #
# ]
831 : : SanitizeString(msg.m_type), msg.m_message_size,
832 : : HexStr(std::span{hash}.first(CMessageHeader::CHECKSUM_SIZE)),
833 : : HexStr(hdr.pchChecksum),
834 : : m_node_id);
835 : 0 : reject_message = true;
836 [ + - - + ]: 5 : } else if (!hdr.IsMessageTypeValid()) {
837 [ # # # # : 0 : LogDebug(BCLog::NET, "Header error: Invalid message type (%s, %u bytes), peer=%d\n",
# # # # #
# ]
838 : : SanitizeString(hdr.GetMessageType()), msg.m_message_size, m_node_id);
839 : 0 : reject_message = true;
840 : : }
841 : :
842 : : // Always reset the network deserializer (prepare for the next message)
843 [ + - ]: 5 : Reset();
844 [ + - ]: 5 : return msg;
845 : 5 : }
846 : :
847 : 14 : bool V1Transport::SetMessageToSend(CSerializedNetMsg& msg) noexcept
848 : : {
849 : 14 : AssertLockNotHeld(m_send_mutex);
850 : : // Determine whether a new message can be set.
851 : 14 : LOCK(m_send_mutex);
852 [ + - - + : 14 : if (m_sending_header || m_bytes_sent < m_message_to_send.data.size()) return false;
+ - ]
853 : :
854 : : // create dbl-sha256 checksum
855 : 14 : uint256 hash = Hash(msg.data);
856 : :
857 : : // create header
858 [ - + ]: 14 : CMessageHeader hdr(m_magic_bytes, msg.m_type.c_str(), msg.data.size());
859 [ + + ]: 14 : memcpy(hdr.pchChecksum, hash.begin(), CMessageHeader::CHECKSUM_SIZE);
860 : :
861 : : // serialize header
862 [ + + ]: 14 : m_header_to_send.clear();
863 : 14 : VectorWriter{m_header_to_send, 0, hdr};
864 : :
865 : : // update state
866 : 14 : m_message_to_send = std::move(msg);
867 : 14 : m_sending_header = true;
868 : 14 : m_bytes_sent = 0;
869 : 14 : return true;
870 : 14 : }
871 : :
872 : 68 : Transport::BytesToSend V1Transport::GetBytesToSend(bool have_next_message) const noexcept
873 : : {
874 : 68 : AssertLockNotHeld(m_send_mutex);
875 : 68 : LOCK(m_send_mutex);
876 [ + + ]: 68 : if (m_sending_header) {
877 [ - + + + ]: 36 : return {std::span{m_header_to_send}.subspan(m_bytes_sent),
878 : : // We have more to send after the header if the message has payload, or if there
879 : : // is a next message after that.
880 [ + + + + ]: 36 : have_next_message || !m_message_to_send.data.empty(),
881 : 36 : m_message_to_send.m_type
882 : 36 : };
883 : : } else {
884 [ - + ]: 32 : return {std::span{m_message_to_send.data}.subspan(m_bytes_sent),
885 : : // We only have more to send after this message's payload if there is another
886 : : // message.
887 : : have_next_message,
888 : 32 : m_message_to_send.m_type
889 : 32 : };
890 : : }
891 : 68 : }
892 : :
893 : 18 : void V1Transport::MarkBytesSent(size_t bytes_sent) noexcept
894 : : {
895 : 18 : AssertLockNotHeld(m_send_mutex);
896 : 18 : LOCK(m_send_mutex);
897 : 18 : m_bytes_sent += bytes_sent;
898 [ + + - + : 18 : if (m_sending_header && m_bytes_sent == m_header_to_send.size()) {
+ - ]
899 : : // We're done sending a message's header. Switch to sending its data bytes.
900 : 11 : m_sending_header = false;
901 : 11 : m_bytes_sent = 0;
902 [ + - - + : 7 : } else if (!m_sending_header && m_bytes_sent == m_message_to_send.data.size()) {
+ - ]
903 : : // We're done sending a message's data. Wipe the data vector to reduce memory consumption.
904 : 7 : ClearShrink(m_message_to_send.data);
905 : 7 : m_bytes_sent = 0;
906 : : }
907 : 18 : }
908 : :
909 : 32 : size_t V1Transport::GetSendMemoryUsage() const noexcept
910 : : {
911 : 32 : AssertLockNotHeld(m_send_mutex);
912 : 32 : LOCK(m_send_mutex);
913 : : // Don't count sending-side fields besides m_message_to_send, as they're all small and bounded.
914 [ + - ]: 32 : return m_message_to_send.GetMemoryUsage();
915 : 32 : }
916 : :
917 : : namespace {
918 : :
919 : : /** List of short messages as defined in BIP324, in order.
920 : : *
921 : : * Only message types that are actually implemented in this codebase need to be listed, as other
922 : : * messages get ignored anyway - whether we know how to decode them or not.
923 : : */
924 : : const std::array<std::string, 33> V2_MESSAGE_IDS = {
925 : : "", // 12 bytes follow encoding the message type like in V1
926 : : NetMsgType::ADDR,
927 : : NetMsgType::BLOCK,
928 : : NetMsgType::BLOCKTXN,
929 : : NetMsgType::CMPCTBLOCK,
930 : : NetMsgType::FEEFILTER,
931 : : NetMsgType::FILTERADD,
932 : : NetMsgType::FILTERCLEAR,
933 : : NetMsgType::FILTERLOAD,
934 : : NetMsgType::GETBLOCKS,
935 : : NetMsgType::GETBLOCKTXN,
936 : : NetMsgType::GETDATA,
937 : : NetMsgType::GETHEADERS,
938 : : NetMsgType::HEADERS,
939 : : NetMsgType::INV,
940 : : NetMsgType::MEMPOOL,
941 : : NetMsgType::MERKLEBLOCK,
942 : : NetMsgType::NOTFOUND,
943 : : NetMsgType::PING,
944 : : NetMsgType::PONG,
945 : : NetMsgType::SENDCMPCT,
946 : : NetMsgType::TX,
947 : : NetMsgType::GETCFILTERS,
948 : : NetMsgType::CFILTER,
949 : : NetMsgType::GETCFHEADERS,
950 : : NetMsgType::CFHEADERS,
951 : : NetMsgType::GETCFCHECKPT,
952 : : NetMsgType::CFCHECKPT,
953 : : NetMsgType::ADDRV2,
954 : : // Unimplemented message types that are assigned in BIP324:
955 : : "",
956 : : "",
957 : : "",
958 : : ""
959 : : };
960 : :
961 : : class V2MessageMap
962 : : {
963 : : std::unordered_map<std::string, uint8_t> m_map;
964 : :
965 : : public:
966 : 157 : V2MessageMap() noexcept
967 : 157 : {
968 [ + + ]: 5181 : for (size_t i = 1; i < std::size(V2_MESSAGE_IDS); ++i) {
969 : 5024 : m_map.emplace(V2_MESSAGE_IDS[i], i);
970 : : }
971 : 157 : }
972 : :
973 : 51 : std::optional<uint8_t> operator()(const std::string& message_name) const noexcept
974 : : {
975 : 51 : auto it = m_map.find(message_name);
976 [ + + ]: 51 : if (it == m_map.end()) return std::nullopt;
977 : 1 : return it->second;
978 : : }
979 : : };
980 : :
981 : : const V2MessageMap V2_MESSAGE_MAP;
982 : :
983 : 75 : std::vector<uint8_t> GenerateRandomGarbage() noexcept
984 : : {
985 : 75 : std::vector<uint8_t> ret;
986 : 75 : FastRandomContext rng;
987 : 75 : ret.resize(rng.randrange(V2Transport::MAX_GARBAGE_LEN + 1));
988 : 75 : rng.fillrand(MakeWritableByteSpan(ret));
989 : 75 : return ret;
990 : 75 : }
991 : :
992 : : } // namespace
993 : :
994 : 74 : void V2Transport::StartSendingHandshake() noexcept
995 : : {
996 : 74 : AssertLockHeld(m_send_mutex);
997 [ - + ]: 74 : Assume(m_send_state == SendState::AWAITING_KEY);
998 : 74 : Assume(m_send_buffer.empty());
999 : : // Initialize the send buffer with ellswift pubkey + provided garbage.
1000 [ - + ]: 74 : m_send_buffer.resize(EllSwiftPubKey::size() + m_send_garbage.size());
1001 : 74 : std::copy(std::begin(m_cipher.GetOurPubKey()), std::end(m_cipher.GetOurPubKey()), MakeWritableByteSpan(m_send_buffer).begin());
1002 : 74 : std::copy(m_send_garbage.begin(), m_send_garbage.end(), m_send_buffer.begin() + EllSwiftPubKey::size());
1003 : : // We cannot wipe m_send_garbage as it will still be used as AAD later in the handshake.
1004 : 74 : }
1005 : :
1006 : 75 : V2Transport::V2Transport(NodeId nodeid, bool initiating, const CKey& key, std::span<const std::byte> ent32, std::vector<uint8_t> garbage) noexcept
1007 : 75 : : m_cipher{key, ent32},
1008 : 75 : m_initiating{initiating},
1009 : 75 : m_nodeid{nodeid},
1010 : 75 : m_v1_fallback{nodeid},
1011 [ + + ]: 75 : m_recv_state{initiating ? RecvState::KEY : RecvState::KEY_MAYBE_V1},
1012 [ - + ]: 75 : m_send_garbage{std::move(garbage)},
1013 [ + + - + ]: 185 : m_send_state{initiating ? SendState::AWAITING_KEY : SendState::MAYBE_V1}
1014 : : {
1015 [ - + + + ]: 75 : Assume(m_send_garbage.size() <= MAX_GARBAGE_LEN);
1016 : : // Start sending immediately if we're the initiator of the connection.
1017 [ + + ]: 75 : if (initiating) {
1018 : 40 : LOCK(m_send_mutex);
1019 [ + - ]: 40 : StartSendingHandshake();
1020 : 40 : }
1021 : 75 : }
1022 : :
1023 : 75 : V2Transport::V2Transport(NodeId nodeid, bool initiating) noexcept
1024 : 150 : : V2Transport{nodeid, initiating, GenerateRandomKey(),
1025 : 150 : MakeByteSpan(GetRandHash()), GenerateRandomGarbage()} {}
1026 : :
1027 : 754 : void V2Transport::SetReceiveState(RecvState recv_state) noexcept
1028 : : {
1029 : 754 : AssertLockHeld(m_recv_mutex);
1030 : : // Enforce allowed state transitions.
1031 [ + + + + : 754 : switch (m_recv_state) {
+ + - - ]
1032 : 35 : case RecvState::KEY_MAYBE_V1:
1033 : 35 : Assume(recv_state == RecvState::KEY || recv_state == RecvState::V1);
1034 : 35 : break;
1035 : 73 : case RecvState::KEY:
1036 : 73 : Assume(recv_state == RecvState::GARB_GARBTERM);
1037 : 73 : break;
1038 : 71 : case RecvState::GARB_GARBTERM:
1039 : 71 : Assume(recv_state == RecvState::VERSION);
1040 : 71 : break;
1041 : 71 : case RecvState::VERSION:
1042 : 71 : Assume(recv_state == RecvState::APP);
1043 : 71 : break;
1044 : 252 : case RecvState::APP:
1045 : 252 : Assume(recv_state == RecvState::APP_READY);
1046 : 252 : break;
1047 : 252 : case RecvState::APP_READY:
1048 : 252 : Assume(recv_state == RecvState::APP);
1049 : 252 : break;
1050 : 0 : case RecvState::V1:
1051 : 0 : Assume(false); // V1 state cannot be left
1052 : 0 : break;
1053 : : }
1054 : : // Change state.
1055 : 754 : m_recv_state = recv_state;
1056 : 754 : }
1057 : :
1058 : 108 : void V2Transport::SetSendState(SendState send_state) noexcept
1059 : : {
1060 : 108 : AssertLockHeld(m_send_mutex);
1061 : : // Enforce allowed state transitions.
1062 [ + + - - ]: 108 : switch (m_send_state) {
1063 : 35 : case SendState::MAYBE_V1:
1064 : 35 : Assume(send_state == SendState::V1 || send_state == SendState::AWAITING_KEY);
1065 : 35 : break;
1066 : 73 : case SendState::AWAITING_KEY:
1067 : 73 : Assume(send_state == SendState::READY);
1068 : 73 : break;
1069 : 0 : case SendState::READY:
1070 : 0 : case SendState::V1:
1071 : 0 : Assume(false); // Final states
1072 : 0 : break;
1073 : : }
1074 : : // Change state.
1075 : 108 : m_send_state = send_state;
1076 : 108 : }
1077 : :
1078 : 2884 : bool V2Transport::ReceivedMessageComplete() const noexcept
1079 : : {
1080 : 2884 : AssertLockNotHeld(m_recv_mutex);
1081 : 2884 : LOCK(m_recv_mutex);
1082 [ + + ]: 2884 : if (m_recv_state == RecvState::V1) return m_v1_fallback.ReceivedMessageComplete();
1083 : :
1084 : 2880 : return m_recv_state == RecvState::APP_READY;
1085 : 2884 : }
1086 : :
1087 : 36 : void V2Transport::ProcessReceivedMaybeV1Bytes() noexcept
1088 : : {
1089 : 36 : AssertLockHeld(m_recv_mutex);
1090 : 36 : AssertLockNotHeld(m_send_mutex);
1091 : 36 : Assume(m_recv_state == RecvState::KEY_MAYBE_V1);
1092 : : // We still have to determine if this is a v1 or v2 connection. The bytes being received could
1093 : : // be the beginning of either a v1 packet (network magic + "version\x00\x00\x00\x00\x00"), or
1094 : : // of a v2 public key. BIP324 specifies that a mismatch with this 16-byte string should trigger
1095 : : // sending of the key.
1096 : 36 : 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};
1097 : 36 : std::copy(std::begin(Params().MessageStart()), std::end(Params().MessageStart()), v1_prefix.begin());
1098 [ - + + + ]: 36 : Assume(m_recv_buffer.size() <= v1_prefix.size());
1099 [ + + ]: 36 : if (!std::equal(m_recv_buffer.begin(), m_recv_buffer.end(), v1_prefix.begin())) {
1100 : : // Mismatch with v1 prefix, so we can assume a v2 connection.
1101 : 34 : SetReceiveState(RecvState::KEY); // Convert to KEY state, leaving received bytes around.
1102 : : // Transition the sender to AWAITING_KEY state and start sending.
1103 : 34 : LOCK(m_send_mutex);
1104 : 34 : SetSendState(SendState::AWAITING_KEY);
1105 [ + - ]: 34 : StartSendingHandshake();
1106 [ + + ]: 36 : } else if (m_recv_buffer.size() == v1_prefix.size()) {
1107 : : // Full match with the v1 prefix, so fall back to v1 behavior.
1108 : 1 : LOCK(m_send_mutex);
1109 [ - + ]: 1 : std::span<const uint8_t> feedback{m_recv_buffer};
1110 : : // Feed already received bytes to v1 transport. It should always accept these, because it's
1111 : : // less than the size of a v1 header, and these are the first bytes fed to m_v1_fallback.
1112 : 1 : bool ret = m_v1_fallback.ReceivedBytes(feedback);
1113 : 1 : Assume(feedback.empty());
1114 : 1 : Assume(ret);
1115 : 1 : SetReceiveState(RecvState::V1);
1116 : 1 : SetSendState(SendState::V1);
1117 : : // Reset v2 transport buffers to save memory.
1118 : 1 : ClearShrink(m_recv_buffer);
1119 [ + - ]: 1 : ClearShrink(m_send_buffer);
1120 : 1 : } else {
1121 : : // We have not received enough to distinguish v1 from v2 yet. Wait until more bytes come.
1122 : : }
1123 : 36 : }
1124 : :
1125 : 144 : bool V2Transport::ProcessReceivedKeyBytes() noexcept
1126 : : {
1127 : 144 : AssertLockHeld(m_recv_mutex);
1128 : 144 : AssertLockNotHeld(m_send_mutex);
1129 [ - + ]: 144 : Assume(m_recv_state == RecvState::KEY);
1130 [ - + + + ]: 144 : Assume(m_recv_buffer.size() <= EllSwiftPubKey::size());
1131 : :
1132 : : // As a special exception, if bytes 4-16 of the key on a responder connection match the
1133 : : // corresponding bytes of a V1 version message, but bytes 0-4 don't match the network magic
1134 : : // (if they did, we'd have switched to V1 state already), assume this is a peer from
1135 : : // another network, and disconnect them. They will almost certainly disconnect us too when
1136 : : // they receive our uniformly random key and garbage, but detecting this case specially
1137 : : // means we can log it.
1138 : 144 : static constexpr std::array<uint8_t, 12> MATCH = {'v', 'e', 'r', 's', 'i', 'o', 'n', 0, 0, 0, 0, 0};
1139 : 144 : static constexpr size_t OFFSET = std::tuple_size_v<MessageStartChars>;
1140 [ + + + - ]: 144 : if (!m_initiating && m_recv_buffer.size() >= OFFSET + MATCH.size()) {
1141 [ + + ]: 81 : if (std::equal(MATCH.begin(), MATCH.end(), m_recv_buffer.begin() + OFFSET)) {
1142 [ + - - + ]: 1 : LogDebug(BCLog::NET, "V2 transport error: V1 peer with wrong MessageStart %s\n",
1143 : : HexStr(std::span(m_recv_buffer).first(OFFSET)));
1144 : 1 : return false;
1145 : : }
1146 : : }
1147 : :
1148 [ + + ]: 143 : if (m_recv_buffer.size() == EllSwiftPubKey::size()) {
1149 : : // Other side's key has been fully received, and can now be Diffie-Hellman combined with
1150 : : // our key to initialize the encryption ciphers.
1151 : :
1152 : : // Initialize the ciphers.
1153 : 73 : EllSwiftPubKey ellswift(MakeByteSpan(m_recv_buffer));
1154 : 73 : LOCK(m_send_mutex);
1155 : 73 : m_cipher.Initialize(ellswift, m_initiating);
1156 : :
1157 : : // Switch receiver state to GARB_GARBTERM.
1158 : 73 : SetReceiveState(RecvState::GARB_GARBTERM);
1159 [ + - ]: 73 : m_recv_buffer.clear();
1160 : :
1161 : : // Switch sender state to READY.
1162 : 73 : SetSendState(SendState::READY);
1163 : :
1164 : : // Append the garbage terminator to the send buffer.
1165 [ - + ]: 73 : m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1166 : 73 : std::copy(m_cipher.GetSendGarbageTerminator().begin(),
1167 : 73 : m_cipher.GetSendGarbageTerminator().end(),
1168 : 73 : MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN).begin());
1169 : :
1170 : : // Construct version packet in the send buffer, with the sent garbage data as AAD.
1171 [ - + ]: 73 : m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::EXPANSION + VERSION_CONTENTS.size());
1172 : 73 : m_cipher.Encrypt(
1173 : : /*contents=*/VERSION_CONTENTS,
1174 : 73 : /*aad=*/MakeByteSpan(m_send_garbage),
1175 : : /*ignore=*/false,
1176 : 73 : /*output=*/MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::EXPANSION + VERSION_CONTENTS.size()));
1177 : : // We no longer need the garbage.
1178 [ + - ]: 73 : ClearShrink(m_send_garbage);
1179 : 73 : } else {
1180 : : // We still have to receive more key bytes.
1181 : : }
1182 : : return true;
1183 : : }
1184 : :
1185 : 141878 : bool V2Transport::ProcessReceivedGarbageBytes() noexcept
1186 : : {
1187 : 141878 : AssertLockHeld(m_recv_mutex);
1188 [ - + ]: 141878 : Assume(m_recv_state == RecvState::GARB_GARBTERM);
1189 [ - + + + ]: 141878 : Assume(m_recv_buffer.size() <= MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1190 [ + + ]: 141878 : if (m_recv_buffer.size() >= BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
1191 [ + + ]: 140783 : if (std::ranges::equal(MakeByteSpan(m_recv_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN), m_cipher.GetReceiveGarbageTerminator())) {
1192 : : // Garbage terminator received. Store garbage to authenticate it as AAD later.
1193 : 71 : m_recv_aad = std::move(m_recv_buffer);
1194 [ - + ]: 71 : m_recv_aad.resize(m_recv_aad.size() - BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1195 [ - + ]: 71 : m_recv_buffer.clear();
1196 : 71 : SetReceiveState(RecvState::VERSION);
1197 [ + + ]: 140712 : } else if (m_recv_buffer.size() == MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
1198 : : // We've reached the maximum length for garbage + garbage terminator, and the
1199 : : // terminator still does not match. Abort.
1200 [ + - ]: 2 : LogDebug(BCLog::NET, "V2 transport error: missing garbage terminator, peer=%d\n", m_nodeid);
1201 : 2 : return false;
1202 : : } else {
1203 : : // We still need to receive more garbage and/or garbage terminator bytes.
1204 : : }
1205 : : } else {
1206 : : // We have less than GARBAGE_TERMINATOR_LEN (16) bytes, so we certainly need to receive
1207 : : // more first.
1208 : : }
1209 : : return true;
1210 : : }
1211 : :
1212 : 103277 : bool V2Transport::ProcessReceivedPacketBytes() noexcept
1213 : : {
1214 : 103277 : AssertLockHeld(m_recv_mutex);
1215 [ - + ]: 103277 : Assume(m_recv_state == RecvState::VERSION || m_recv_state == RecvState::APP);
1216 : :
1217 : : // The maximum permitted contents length for a packet, consisting of:
1218 : : // - 0x00 byte: indicating long message type encoding
1219 : : // - 12 bytes of message type
1220 : : // - payload
1221 : 103277 : static constexpr size_t MAX_CONTENTS_LEN =
1222 : : 1 + CMessageHeader::MESSAGE_TYPE_SIZE +
1223 : : std::min<size_t>(MAX_SIZE, MAX_PROTOCOL_MESSAGE_LENGTH);
1224 : :
1225 [ - + + + ]: 103277 : if (m_recv_buffer.size() == BIP324Cipher::LENGTH_LEN) {
1226 : : // Length descriptor received.
1227 : 50967 : m_recv_len = m_cipher.DecryptLength(MakeByteSpan(m_recv_buffer));
1228 [ + + ]: 50967 : if (m_recv_len > MAX_CONTENTS_LEN) {
1229 [ + - ]: 10 : LogDebug(BCLog::NET, "V2 transport error: packet too large (%u bytes), peer=%d\n", m_recv_len, m_nodeid);
1230 : 10 : return false;
1231 : : }
1232 [ + + + + ]: 52310 : } else if (m_recv_buffer.size() > BIP324Cipher::LENGTH_LEN && m_recv_buffer.size() == m_recv_len + BIP324Cipher::EXPANSION) {
1233 : : // Ciphertext received, decrypt it into m_recv_decode_buffer.
1234 : : // Note that it is impossible to reach this branch without hitting the branch above first,
1235 : : // as GetMaxBytesToProcess only allows up to LENGTH_LEN into the buffer before that point.
1236 : 50957 : m_recv_decode_buffer.resize(m_recv_len);
1237 : 50957 : bool ignore{false};
1238 : 101914 : bool ret = m_cipher.Decrypt(
1239 : 50957 : /*input=*/MakeByteSpan(m_recv_buffer).subspan(BIP324Cipher::LENGTH_LEN),
1240 : 50957 : /*aad=*/MakeByteSpan(m_recv_aad),
1241 : : /*ignore=*/ignore,
1242 : : /*contents=*/MakeWritableByteSpan(m_recv_decode_buffer));
1243 [ + + ]: 50957 : if (!ret) {
1244 [ + - ]: 10 : LogDebug(BCLog::NET, "V2 transport error: packet decryption failure (%u bytes), peer=%d\n", m_recv_len, m_nodeid);
1245 : 10 : return false;
1246 : : }
1247 : : // We have decrypted a valid packet with the AAD we expected, so clear the expected AAD.
1248 : 50947 : ClearShrink(m_recv_aad);
1249 : : // Feed the last 4 bytes of the Poly1305 authentication tag (and its timing) into our RNG.
1250 [ - + ]: 50947 : RandAddEvent(ReadLE32(m_recv_buffer.data() + m_recv_buffer.size() - 4));
1251 : :
1252 : : // At this point we have a valid packet decrypted into m_recv_decode_buffer. If it's not a
1253 : : // decoy, which we simply ignore, use the current state to decide what to do with it.
1254 [ + + ]: 50947 : if (!ignore) {
1255 [ + + - ]: 323 : switch (m_recv_state) {
1256 : 71 : case RecvState::VERSION:
1257 : : // Version message received; transition to application phase. The contents is
1258 : : // ignored, but can be used for future extensions.
1259 : 71 : SetReceiveState(RecvState::APP);
1260 : 71 : break;
1261 : 252 : case RecvState::APP:
1262 : : // Application message decrypted correctly. It can be extracted using GetMessage().
1263 : 252 : SetReceiveState(RecvState::APP_READY);
1264 : 252 : break;
1265 : 0 : default:
1266 : : // Any other state is invalid (this function should not have been called).
1267 : 0 : Assume(false);
1268 : : }
1269 : : }
1270 : : // Wipe the receive buffer where the next packet will be received into.
1271 : 50947 : ClearShrink(m_recv_buffer);
1272 : : // In all but APP_READY state, we can wipe the decoded contents.
1273 [ + + ]: 50947 : if (m_recv_state != RecvState::APP_READY) ClearShrink(m_recv_decode_buffer);
1274 : : } else {
1275 : : // We either have less than 3 bytes, so we don't know the packet's length yet, or more
1276 : : // than 3 bytes but less than the packet's full ciphertext. Wait until those arrive.
1277 : : }
1278 : : return true;
1279 : : }
1280 : :
1281 : 245609 : size_t V2Transport::GetMaxBytesToProcess() noexcept
1282 : : {
1283 : 245609 : AssertLockHeld(m_recv_mutex);
1284 [ + + + + : 245609 : switch (m_recv_state) {
- - + ]
1285 : 36 : case RecvState::KEY_MAYBE_V1:
1286 : : // During the KEY_MAYBE_V1 state we do not allow more than the length of v1 prefix into the
1287 : : // receive buffer.
1288 [ - + ]: 36 : Assume(m_recv_buffer.size() <= V1_PREFIX_LEN);
1289 : : // As long as we're not sure if this is a v1 or v2 connection, don't receive more than what
1290 : : // is strictly necessary to distinguish the two (16 bytes). If we permitted more than
1291 : : // the v1 header size (24 bytes), we may not be able to feed the already-received bytes
1292 : : // back into the m_v1_fallback V1 transport.
1293 : 36 : return V1_PREFIX_LEN - m_recv_buffer.size();
1294 : 144 : case RecvState::KEY:
1295 : : // During the KEY state, we only allow the 64-byte key into the receive buffer.
1296 [ - + ]: 144 : Assume(m_recv_buffer.size() <= EllSwiftPubKey::size());
1297 : : // As long as we have not received the other side's public key, don't receive more than
1298 : : // that (64 bytes), as garbage follows, and locating the garbage terminator requires the
1299 : : // key exchange first.
1300 : 144 : return EllSwiftPubKey::size() - m_recv_buffer.size();
1301 : : case RecvState::GARB_GARBTERM:
1302 : : // Process garbage bytes one by one (because terminator may appear anywhere).
1303 : : return 1;
1304 : 103277 : case RecvState::VERSION:
1305 : 103277 : case RecvState::APP:
1306 : : // These three states all involve decoding a packet. Process the length descriptor first,
1307 : : // so that we know where the current packet ends (and we don't process bytes from the next
1308 : : // packet or decoy yet). Then, process the ciphertext bytes of the current packet.
1309 [ - + + + ]: 103277 : if (m_recv_buffer.size() < BIP324Cipher::LENGTH_LEN) {
1310 : 50977 : return BIP324Cipher::LENGTH_LEN - m_recv_buffer.size();
1311 : : } else {
1312 : : // Note that BIP324Cipher::EXPANSION is the total difference between contents size
1313 : : // and encoded packet size, which includes the 3 bytes due to the packet length.
1314 : : // When transitioning from receiving the packet length to receiving its ciphertext,
1315 : : // the encrypted packet length is left in the receive buffer.
1316 : 52300 : return BIP324Cipher::EXPANSION + m_recv_len - m_recv_buffer.size();
1317 : : }
1318 : 274 : case RecvState::APP_READY:
1319 : : // No bytes can be processed until GetMessage() is called.
1320 : 274 : return 0;
1321 : 0 : case RecvState::V1:
1322 : : // Not allowed (must be dealt with by the caller).
1323 : 0 : Assume(false);
1324 : 0 : return 0;
1325 : : }
1326 : 0 : Assume(false); // unreachable
1327 : 0 : return 0;
1328 : : }
1329 : :
1330 : 2189 : bool V2Transport::ReceivedBytes(std::span<const uint8_t>& msg_bytes) noexcept
1331 : : {
1332 : 2189 : AssertLockNotHeld(m_recv_mutex);
1333 : : /** How many bytes to allocate in the receive buffer at most above what is received so far. */
1334 : 2189 : static constexpr size_t MAX_RESERVE_AHEAD = 256 * 1024;
1335 : :
1336 : 2189 : LOCK(m_recv_mutex);
1337 [ + + ]: 2189 : if (m_recv_state == RecvState::V1) return m_v1_fallback.ReceivedBytes(msg_bytes);
1338 : :
1339 : : // Process the provided bytes in msg_bytes in a loop. In each iteration a nonzero number of
1340 : : // bytes (decided by GetMaxBytesToProcess) are taken from the beginning om msg_bytes, and
1341 : : // appended to m_recv_buffer. Then, depending on the receiver state, one of the
1342 : : // ProcessReceived*Bytes functions is called to process the bytes in that buffer.
1343 [ + + ]: 247498 : while (!msg_bytes.empty()) {
1344 : : // Decide how many bytes to copy from msg_bytes to m_recv_buffer.
1345 : 245609 : size_t max_read = GetMaxBytesToProcess();
1346 : :
1347 : : // Reserve space in the buffer if there is not enough.
1348 [ - + + + : 247510 : if (m_recv_buffer.size() + std::min(msg_bytes.size(), max_read) > m_recv_buffer.capacity()) {
- + + + ]
1349 [ + + - - : 102046 : switch (m_recv_state) {
- ]
1350 : 75 : case RecvState::KEY_MAYBE_V1:
1351 : 75 : case RecvState::KEY:
1352 : 75 : case RecvState::GARB_GARBTERM:
1353 : : // During the initial states (key/garbage), allocate once to fit the maximum (4111
1354 : : // bytes).
1355 : 75 : m_recv_buffer.reserve(MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1356 : 75 : break;
1357 : 101971 : case RecvState::VERSION:
1358 : 101971 : case RecvState::APP: {
1359 : : // During states where a packet is being received, as much as is expected but never
1360 : : // more than MAX_RESERVE_AHEAD bytes in addition to what is received so far.
1361 : : // This means attackers that want to cause us to waste allocated memory are limited
1362 : : // to MAX_RESERVE_AHEAD above the largest allowed message contents size, and to
1363 : : // MAX_RESERVE_AHEAD more than they've actually sent us.
1364 [ + + ]: 101971 : size_t alloc_add = std::min(max_read, msg_bytes.size() + MAX_RESERVE_AHEAD);
1365 : 101971 : m_recv_buffer.reserve(m_recv_buffer.size() + alloc_add);
1366 : 101971 : break;
1367 : : }
1368 : 0 : case RecvState::APP_READY:
1369 : : // The buffer is empty in this state.
1370 : 0 : Assume(m_recv_buffer.empty());
1371 : 0 : break;
1372 : 0 : case RecvState::V1:
1373 : : // Should have bailed out above.
1374 : 0 : Assume(false);
1375 : 0 : break;
1376 : : }
1377 : : }
1378 : :
1379 : : // Can't read more than provided input.
1380 [ + + ]: 245609 : max_read = std::min(msg_bytes.size(), max_read);
1381 : : // Copy data to buffer.
1382 : 245609 : m_recv_buffer.insert(m_recv_buffer.end(), UCharCast(msg_bytes.data()), UCharCast(msg_bytes.data() + max_read));
1383 [ + + + + : 245609 : msg_bytes = msg_bytes.subspan(max_read);
- - + ]
1384 : :
1385 : : // Process data in the buffer.
1386 [ + + + + : 245609 : switch (m_recv_state) {
- - + ]
1387 : 36 : case RecvState::KEY_MAYBE_V1:
1388 : 36 : ProcessReceivedMaybeV1Bytes();
1389 [ + + ]: 36 : if (m_recv_state == RecvState::V1) return true;
1390 : : break;
1391 : :
1392 : 144 : case RecvState::KEY:
1393 [ + + ]: 144 : if (!ProcessReceivedKeyBytes()) return false;
1394 : : break;
1395 : :
1396 : 141878 : case RecvState::GARB_GARBTERM:
1397 [ + + ]: 141878 : if (!ProcessReceivedGarbageBytes()) return false;
1398 : : break;
1399 : :
1400 : 103277 : case RecvState::VERSION:
1401 : 103277 : case RecvState::APP:
1402 [ + + ]: 103277 : if (!ProcessReceivedPacketBytes()) return false;
1403 : : break;
1404 : :
1405 : : case RecvState::APP_READY:
1406 : : return true;
1407 : :
1408 : 0 : case RecvState::V1:
1409 : : // We should have bailed out before.
1410 : 0 : Assume(false);
1411 : 0 : break;
1412 : : }
1413 : : // Make sure we have made progress before continuing.
1414 : 245311 : Assume(max_read > 0);
1415 : : }
1416 : :
1417 : : return true;
1418 : 2189 : }
1419 : :
1420 : 252 : std::optional<std::string> V2Transport::GetMessageType(std::span<const uint8_t>& contents) noexcept
1421 : : {
1422 [ - + ]: 252 : if (contents.size() == 0) return std::nullopt; // Empty contents
1423 [ + + ]: 252 : uint8_t first_byte = contents[0];
1424 [ + + ]: 252 : contents = contents.subspan(1); // Strip first byte.
1425 : :
1426 [ + + ]: 252 : if (first_byte != 0) {
1427 : : // Short (1 byte) encoding.
1428 [ + + ]: 132 : if (first_byte < std::size(V2_MESSAGE_IDS)) {
1429 : : // Valid short message id.
1430 [ - + ]: 262 : return V2_MESSAGE_IDS[first_byte];
1431 : : } else {
1432 : : // Unknown short message id.
1433 : 1 : return std::nullopt;
1434 : : }
1435 : : }
1436 : :
1437 [ + + ]: 120 : if (contents.size() < CMessageHeader::MESSAGE_TYPE_SIZE) {
1438 : 10 : return std::nullopt; // Long encoding needs 12 message type bytes.
1439 : : }
1440 : :
1441 : : size_t msg_type_len{0};
1442 [ + - + + ]: 830 : while (msg_type_len < CMessageHeader::MESSAGE_TYPE_SIZE && contents[msg_type_len] != 0) {
1443 : : // Verify that message type bytes before the first 0x00 are in range.
1444 [ - + + - ]: 720 : if (contents[msg_type_len] < ' ' || contents[msg_type_len] > 0x7F) {
1445 : 0 : return {};
1446 : : }
1447 : 720 : ++msg_type_len;
1448 : : }
1449 : 110 : std::string ret{reinterpret_cast<const char*>(contents.data()), msg_type_len};
1450 [ + + ]: 610 : while (msg_type_len < CMessageHeader::MESSAGE_TYPE_SIZE) {
1451 : : // Verify that message type bytes after the first 0x00 are also 0x00.
1452 [ + + ]: 550 : if (contents[msg_type_len] != 0) return {};
1453 : 500 : ++msg_type_len;
1454 : : }
1455 : : // Strip message type bytes of contents.
1456 : 60 : contents = contents.subspan(CMessageHeader::MESSAGE_TYPE_SIZE);
1457 : 60 : return ret;
1458 : 110 : }
1459 : :
1460 : 252 : CNetMessage V2Transport::GetReceivedMessage(NodeClock::time_point time, bool& reject_message) noexcept
1461 : : {
1462 : 252 : AssertLockNotHeld(m_recv_mutex);
1463 : 252 : LOCK(m_recv_mutex);
1464 [ - + ]: 252 : if (m_recv_state == RecvState::V1) return m_v1_fallback.GetReceivedMessage(time, reject_message);
1465 : :
1466 [ - + ]: 252 : Assume(m_recv_state == RecvState::APP_READY);
1467 [ - + ]: 252 : std::span<const uint8_t> contents{m_recv_decode_buffer};
1468 : 252 : auto msg_type = GetMessageType(contents);
1469 : 252 : CNetMessage msg{DataStream{}};
1470 : : // Note that BIP324Cipher::EXPANSION also includes the length descriptor size.
1471 [ - + ]: 252 : msg.m_raw_message_size = m_recv_decode_buffer.size() + BIP324Cipher::EXPANSION;
1472 [ + + ]: 252 : if (msg_type) {
1473 : 191 : reject_message = false;
1474 : 191 : msg.m_type = std::move(*msg_type);
1475 : 191 : msg.m_time = time;
1476 : 191 : msg.m_message_size = contents.size();
1477 : 191 : msg.m_recv.resize(contents.size());
1478 : 191 : std::copy(contents.begin(), contents.end(), UCharCast(msg.m_recv.data()));
1479 : : } else {
1480 [ + - - + ]: 61 : LogDebug(BCLog::NET, "V2 transport error: invalid message type (%u bytes contents), peer=%d\n", m_recv_decode_buffer.size(), m_nodeid);
1481 : 61 : reject_message = true;
1482 : : }
1483 : 252 : ClearShrink(m_recv_decode_buffer);
1484 : 252 : SetReceiveState(RecvState::APP);
1485 : :
1486 : 252 : return msg;
1487 : 252 : }
1488 : :
1489 : 51 : bool V2Transport::SetMessageToSend(CSerializedNetMsg& msg) noexcept
1490 : : {
1491 : 51 : AssertLockNotHeld(m_send_mutex);
1492 : 51 : LOCK(m_send_mutex);
1493 [ - + ]: 51 : if (m_send_state == SendState::V1) return m_v1_fallback.SetMessageToSend(msg);
1494 : : // We only allow adding a new message to be sent when in the READY state (so the packet cipher
1495 : : // is available) and the send buffer is empty. This limits the number of messages in the send
1496 : : // buffer to just one, and leaves the responsibility for queueing them up to the caller.
1497 [ + - + - ]: 51 : if (!(m_send_state == SendState::READY && m_send_buffer.empty())) return false;
1498 : : // Construct contents (encoding message type + payload).
1499 : 51 : std::vector<uint8_t> contents;
1500 : 51 : auto short_message_id = V2_MESSAGE_MAP(msg.m_type);
1501 [ + + ]: 51 : if (short_message_id) {
1502 [ - + ]: 1 : contents.resize(1 + msg.data.size());
1503 : 1 : contents[0] = *short_message_id;
1504 : 1 : std::copy(msg.data.begin(), msg.data.end(), contents.begin() + 1);
1505 : : } else {
1506 : : // Initialize with zeroes, and then write the message type string starting at offset 1.
1507 : : // This means contents[0] and the unused positions in contents[1..13] remain 0x00.
1508 [ - + ]: 50 : contents.resize(1 + CMessageHeader::MESSAGE_TYPE_SIZE + msg.data.size(), 0);
1509 [ - + ]: 50 : std::copy(msg.m_type.begin(), msg.m_type.end(), contents.data() + 1);
1510 : 50 : std::copy(msg.data.begin(), msg.data.end(), contents.begin() + 1 + CMessageHeader::MESSAGE_TYPE_SIZE);
1511 : : }
1512 : : // Construct ciphertext in send buffer.
1513 [ - + ]: 51 : m_send_buffer.resize(contents.size() + BIP324Cipher::EXPANSION);
1514 : 51 : m_cipher.Encrypt(MakeByteSpan(contents), {}, false, MakeWritableByteSpan(m_send_buffer));
1515 : 51 : m_send_type = msg.m_type;
1516 : : // Release memory
1517 : 51 : ClearShrink(msg.data);
1518 : 51 : return true;
1519 : 51 : }
1520 : :
1521 : 2884 : Transport::BytesToSend V2Transport::GetBytesToSend(bool have_next_message) const noexcept
1522 : : {
1523 : 2884 : AssertLockNotHeld(m_send_mutex);
1524 : 2884 : LOCK(m_send_mutex);
1525 [ + + ]: 2884 : if (m_send_state == SendState::V1) return m_v1_fallback.GetBytesToSend(have_next_message);
1526 : :
1527 [ + + ]: 2880 : if (m_send_state == SendState::MAYBE_V1) Assume(m_send_buffer.empty());
1528 [ - + + + ]: 2880 : Assume(m_send_pos <= m_send_buffer.size());
1529 : 2880 : return {
1530 [ + + ]: 2880 : std::span{m_send_buffer}.subspan(m_send_pos),
1531 : : // We only have more to send after the current m_send_buffer if there is a (next)
1532 : : // message to be sent, and we're capable of sending packets. */
1533 [ + + - + ]: 2880 : have_next_message && m_send_state == SendState::READY,
1534 : 2880 : m_send_type
1535 : 2880 : };
1536 : 2884 : }
1537 : :
1538 : 908 : void V2Transport::MarkBytesSent(size_t bytes_sent) noexcept
1539 : : {
1540 : 908 : AssertLockNotHeld(m_send_mutex);
1541 : 908 : LOCK(m_send_mutex);
1542 [ - + - - ]: 908 : if (m_send_state == SendState::V1) return m_v1_fallback.MarkBytesSent(bytes_sent);
1543 : :
1544 [ + + + + : 908 : if (m_send_state == SendState::AWAITING_KEY && m_send_pos == 0 && bytes_sent > 0) {
+ - ]
1545 [ + - ]: 45 : LogDebug(BCLog::NET, "start sending v2 handshake to peer=%d\n", m_nodeid);
1546 : : }
1547 : :
1548 : 908 : m_send_pos += bytes_sent;
1549 [ - + + + ]: 908 : Assume(m_send_pos <= m_send_buffer.size());
1550 [ + + ]: 908 : if (m_send_pos >= CMessageHeader::HEADER_SIZE) {
1551 : 800 : m_sent_v1_header_worth = true;
1552 : : }
1553 : : // Wipe the buffer when everything is sent.
1554 [ + + ]: 908 : if (m_send_pos == m_send_buffer.size()) {
1555 : 150 : m_send_pos = 0;
1556 : 150 : ClearShrink(m_send_buffer);
1557 : : }
1558 : 908 : }
1559 : :
1560 : 0 : bool V2Transport::ShouldReconnectV1() const noexcept
1561 : : {
1562 : 0 : AssertLockNotHeld(m_send_mutex);
1563 : 0 : AssertLockNotHeld(m_recv_mutex);
1564 : : // Only outgoing connections need reconnection.
1565 [ # # ]: 0 : if (!m_initiating) return false;
1566 : :
1567 : 0 : LOCK(m_recv_mutex);
1568 : : // We only reconnect in the very first state and when the receive buffer is empty. Together
1569 : : // these conditions imply nothing has been received so far.
1570 [ # # ]: 0 : if (m_recv_state != RecvState::KEY) return false;
1571 [ # # ]: 0 : if (!m_recv_buffer.empty()) return false;
1572 : : // Check if we've sent enough for the other side to disconnect us (if it was V1).
1573 : 0 : LOCK(m_send_mutex);
1574 [ # # ]: 0 : return m_sent_v1_header_worth;
1575 : 0 : }
1576 : :
1577 : 0 : size_t V2Transport::GetSendMemoryUsage() const noexcept
1578 : : {
1579 : 0 : AssertLockNotHeld(m_send_mutex);
1580 : 0 : LOCK(m_send_mutex);
1581 [ # # ]: 0 : if (m_send_state == SendState::V1) return m_v1_fallback.GetSendMemoryUsage();
1582 : :
1583 [ # # ]: 0 : return sizeof(m_send_buffer) + memusage::DynamicUsage(m_send_buffer);
1584 : 0 : }
1585 : :
1586 : 71 : Transport::Info V2Transport::GetInfo() const noexcept
1587 : : {
1588 : 71 : AssertLockNotHeld(m_recv_mutex);
1589 : 71 : LOCK(m_recv_mutex);
1590 [ - + ]: 71 : if (m_recv_state == RecvState::V1) return m_v1_fallback.GetInfo();
1591 : :
1592 [ + - ]: 71 : Transport::Info info;
1593 : :
1594 : : // Do not report v2 and session ID until the version packet has been received
1595 : : // and verified (confirming that the other side very likely has the same keys as us).
1596 [ + - ]: 71 : if (m_recv_state != RecvState::KEY_MAYBE_V1 && m_recv_state != RecvState::KEY &&
1597 : : m_recv_state != RecvState::GARB_GARBTERM && m_recv_state != RecvState::VERSION) {
1598 : 71 : info.transport_type = TransportProtocolType::V2;
1599 : 71 : info.session_id = uint256(MakeUCharSpan(m_cipher.GetSessionID()));
1600 : : } else {
1601 : 0 : info.transport_type = TransportProtocolType::DETECTING;
1602 : : }
1603 : :
1604 : 71 : return info;
1605 : 71 : }
1606 : :
1607 : 9 : std::pair<size_t, bool> CConnman::SocketSendData(CNode& node) const
1608 : : {
1609 : 9 : auto it = node.vSendMsg.begin();
1610 : 9 : size_t nSentSize = 0;
1611 : 9 : bool data_left{false}; //!< second return value (whether unsent data remains)
1612 : 9 : std::optional<bool> expected_more;
1613 : :
1614 : 9 : while (true) {
1615 [ + - ]: 9 : if (it != node.vSendMsg.end()) {
1616 : : // If possible, move one message from the send queue to the transport. This fails when
1617 : : // there is an existing message still being sent, or (for v2 transports) when the
1618 : : // handshake has not yet completed.
1619 : 9 : size_t memusage = it->GetMemoryUsage();
1620 [ + - ]: 9 : if (node.m_transport->SetMessageToSend(*it)) {
1621 : : // Update memory usage of send buffer (as *it will be deleted).
1622 : 9 : node.m_send_memusage -= memusage;
1623 : 9 : ++it;
1624 : : }
1625 : : }
1626 [ - + ]: 9 : const auto& [data, more, msg_type] = node.m_transport->GetBytesToSend(it != node.vSendMsg.end());
1627 : : // We rely on the 'more' value returned by GetBytesToSend to correctly predict whether more
1628 : : // bytes are still to be sent, to correctly set the MSG_MORE flag. As a sanity check,
1629 : : // verify that the previously returned 'more' was correct.
1630 [ - + ]: 9 : if (expected_more.has_value()) Assume(!data.empty() == *expected_more);
1631 [ + - ]: 9 : expected_more = more;
1632 [ + - ]: 9 : data_left = !data.empty(); // will be overwritten on next loop if all of data gets sent
1633 : 9 : int nBytes = 0;
1634 [ + - ]: 9 : if (!data.empty()) {
1635 : 9 : LOCK(node.m_sock_mutex);
1636 : : // There is no socket in case we've already disconnected, or in test cases without
1637 : : // real connections. In these cases, we bail out immediately and just leave things
1638 : : // in the send queue and transport.
1639 [ - + ]: 9 : if (!node.m_sock) {
1640 : : break;
1641 : : }
1642 : 0 : int flags = MSG_NOSIGNAL | MSG_DONTWAIT;
1643 : : #ifdef MSG_MORE
1644 [ # # ]: 0 : if (more) {
1645 : 0 : flags |= MSG_MORE;
1646 : : }
1647 : : #endif
1648 [ # # # # ]: 0 : nBytes = node.m_sock->Send(data.data(), data.size(), flags);
1649 : 9 : }
1650 [ # # ]: 0 : if (nBytes > 0) {
1651 : 0 : node.m_last_send = NodeClock::now();
1652 : 0 : node.nSendBytes += nBytes;
1653 : : // Notify transport that bytes have been processed.
1654 : 0 : node.m_transport->MarkBytesSent(nBytes);
1655 : : // Update statistics per message type.
1656 [ # # ]: 0 : if (!msg_type.empty()) { // don't report v2 handshake bytes for now
1657 : 0 : node.AccountForSentBytes(msg_type, nBytes);
1658 : : }
1659 : 0 : nSentSize += nBytes;
1660 [ # # ]: 0 : if ((size_t)nBytes != data.size()) {
1661 : : // could not send full message; stop sending more
1662 : : break;
1663 : : }
1664 : : } else {
1665 [ # # ]: 0 : if (nBytes < 0) {
1666 : : // error
1667 : 0 : int nErr = WSAGetLastError();
1668 [ # # # # ]: 0 : if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS) {
1669 [ # # # # : 0 : LogDebug(BCLog::NET, "socket send error, %s: %s", node.DisconnectMsg(), NetworkErrorString(nErr));
# # ]
1670 : 0 : node.CloseSocketDisconnect();
1671 : : }
1672 : : }
1673 : : break;
1674 : : }
1675 : : }
1676 : :
1677 [ + - ]: 9 : node.fPauseSend = node.m_send_memusage + node.m_transport->GetSendMemoryUsage() > nSendBufferMaxSize;
1678 : :
1679 [ + - ]: 9 : if (it == node.vSendMsg.end()) {
1680 [ - + ]: 9 : assert(node.m_send_memusage == 0);
1681 : : }
1682 : 9 : node.vSendMsg.erase(node.vSendMsg.begin(), it);
1683 : 9 : return {nSentSize, data_left};
1684 : : }
1685 : :
1686 : : /** Try to find a connection to evict when the node is full.
1687 : : * Extreme care must be taken to avoid opening the node to attacker
1688 : : * triggered network partitioning.
1689 : : * The strategy used here is to protect a small number of peers
1690 : : * for each of several distinct characteristics which are difficult
1691 : : * to forge. In order to partition a node the attacker must be
1692 : : * simultaneously better at all of them than honest peers.
1693 : : */
1694 : 0 : bool CConnman::AttemptToEvictConnection()
1695 : : {
1696 : 0 : AssertLockNotHeld(m_nodes_mutex);
1697 : :
1698 : 0 : std::vector<NodeEvictionCandidate> vEvictionCandidates;
1699 : 0 : {
1700 : :
1701 [ # # ]: 0 : LOCK(m_nodes_mutex);
1702 [ # # ]: 0 : for (const CNode* node : m_nodes) {
1703 [ # # ]: 0 : if (node->fDisconnect)
1704 : 0 : continue;
1705 : 0 : NodeEvictionCandidate candidate{
1706 : 0 : .id = node->GetId(),
1707 : : .m_connected = node->m_connected,
1708 : 0 : .m_min_ping_time = node->m_min_ping_time,
1709 : 0 : .m_last_block_time = node->m_last_block_time,
1710 : 0 : .m_last_tx_time = node->m_last_tx_time,
1711 [ # # ]: 0 : .fRelevantServices = node->m_has_all_wanted_services,
1712 : 0 : .m_relay_txs = node->m_relays_txs.load(),
1713 : 0 : .fBloomFilter = node->m_bloom_filter_loaded.load(),
1714 : 0 : .nKeyedNetGroup = node->nKeyedNetGroup,
1715 : 0 : .prefer_evict = node->m_prefer_evict,
1716 [ # # ]: 0 : .m_is_local = node->addr.IsLocal(),
1717 : 0 : .m_network = node->ConnectedThroughNetwork(),
1718 : 0 : .m_noban = node->HasPermission(NetPermissionFlags::NoBan),
1719 : 0 : .m_conn_type = node->m_conn_type,
1720 [ # # # # : 0 : };
# # ]
1721 [ # # ]: 0 : vEvictionCandidates.push_back(candidate);
1722 : : }
1723 : 0 : }
1724 [ # # ]: 0 : const std::optional<NodeId> node_id_to_evict = SelectNodeToEvict(std::move(vEvictionCandidates));
1725 [ # # ]: 0 : if (!node_id_to_evict) {
1726 : : return false;
1727 : : }
1728 [ # # ]: 0 : LOCK(m_nodes_mutex);
1729 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
1730 [ # # ]: 0 : if (pnode->GetId() == *node_id_to_evict) {
1731 [ # # # # : 0 : LogDebug(BCLog::NET, "selected %s connection for eviction, %s", pnode->ConnectionTypeAsString(), pnode->DisconnectMsg());
# # # # ]
1732 : : TRACEPOINT(net, evicted_inbound_connection,
1733 : : pnode->GetId(),
1734 : : pnode->m_addr_name.c_str(),
1735 : : pnode->ConnectionTypeAsString().c_str(),
1736 : : pnode->ConnectedThroughNetwork(),
1737 : 0 : TicksSinceEpoch<std::chrono::seconds>(pnode->m_connected));
1738 : 0 : pnode->fDisconnect = true;
1739 : 0 : return true;
1740 : : }
1741 : : }
1742 : : return false;
1743 : 0 : }
1744 : :
1745 : 0 : void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
1746 : 0 : AssertLockNotHeld(m_nodes_mutex);
1747 : :
1748 : 0 : struct sockaddr_storage sockaddr;
1749 : 0 : socklen_t len = sizeof(sockaddr);
1750 : 0 : auto sock = hListenSocket.sock->Accept((struct sockaddr*)&sockaddr, &len);
1751 : :
1752 [ # # ]: 0 : if (!sock) {
1753 : 0 : const int nErr = WSAGetLastError();
1754 [ # # ]: 0 : if (nErr != WSAEWOULDBLOCK) {
1755 [ # # # # ]: 0 : LogInfo("socket error accept failed: %s\n", NetworkErrorString(nErr));
1756 : : }
1757 : 0 : return;
1758 : : }
1759 : :
1760 [ # # ]: 0 : CService addr;
1761 [ # # # # ]: 0 : if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr, len)) {
1762 [ # # ]: 0 : LogWarning("Unknown socket family\n");
1763 : : } else {
1764 [ # # ]: 0 : addr = MaybeFlipIPv6toCJDNS(addr);
1765 : : }
1766 : :
1767 [ # # # # ]: 0 : const CService addr_bind{MaybeFlipIPv6toCJDNS(GetBindAddress(*sock))};
1768 : :
1769 : 0 : NetPermissionFlags permission_flags = NetPermissionFlags::None;
1770 [ # # ]: 0 : hListenSocket.AddSocketPermissionFlags(permission_flags);
1771 : :
1772 [ # # ]: 0 : CreateNodeFromAcceptedSocket(std::move(sock), permission_flags, addr_bind, addr);
1773 : 0 : }
1774 : :
1775 : 0 : void CConnman::CreateNodeFromAcceptedSocket(std::unique_ptr<Sock>&& sock,
1776 : : NetPermissionFlags permission_flags,
1777 : : const CService& addr_bind,
1778 : : const CService& addr)
1779 : : {
1780 : 0 : AssertLockNotHeld(m_nodes_mutex);
1781 : :
1782 : 0 : int nInbound = 0;
1783 : :
1784 [ # # ]: 0 : const bool inbound_onion = std::find(m_onion_binds.begin(), m_onion_binds.end(), addr_bind) != m_onion_binds.end();
1785 : :
1786 : : // Tor inbound connections do not reveal the peer's actual network address.
1787 : : // Therefore do not apply address-based whitelist permissions to them.
1788 [ # # # # ]: 0 : AddWhitelistPermissionFlags(permission_flags, inbound_onion ? std::optional<CNetAddr>{} : addr, vWhitelistedRangeIncoming);
1789 : :
1790 : 0 : {
1791 : 0 : LOCK(m_nodes_mutex);
1792 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
1793 [ # # ]: 0 : if (pnode->IsInboundConn()) nInbound++;
1794 : : }
1795 : 0 : }
1796 : :
1797 [ # # ]: 0 : if (!fNetworkActive) {
1798 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s dropped: not accepting new connections\n", addr.ToStringAddrPort());
1799 : 0 : return;
1800 : : }
1801 : :
1802 [ # # ]: 0 : if (!sock->IsSelectable()) {
1803 [ # # ]: 0 : LogInfo("connection from %s dropped: non-selectable socket\n", addr.ToStringAddrPort());
1804 : 0 : return;
1805 : : }
1806 : :
1807 : : // According to the internet TCP_NODELAY is not carried into accepted sockets
1808 : : // on all platforms. Set it again here just to be sure.
1809 : 0 : const int on{1};
1810 [ # # ]: 0 : if (sock->SetSockOpt(IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) == SOCKET_ERROR) {
1811 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s: unable to set TCP_NODELAY, continuing anyway\n",
1812 : : addr.ToStringAddrPort());
1813 : : }
1814 : :
1815 : : // Don't accept connections from banned peers.
1816 [ # # # # ]: 0 : bool banned = m_banman && m_banman->IsBanned(addr);
1817 [ # # # # ]: 0 : if (!NetPermissions::HasFlag(permission_flags, NetPermissionFlags::NoBan) && banned)
1818 : : {
1819 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s dropped (banned)\n", addr.ToStringAddrPort());
1820 : 0 : return;
1821 : : }
1822 : :
1823 : : // Only accept connections from discouraged peers if our inbound slots aren't (almost) full.
1824 [ # # # # ]: 0 : bool discouraged = m_banman && m_banman->IsDiscouraged(addr);
1825 [ # # # # : 0 : if (!NetPermissions::HasFlag(permission_flags, NetPermissionFlags::NoBan) && nInbound + 1 >= m_max_inbound && discouraged)
# # ]
1826 : : {
1827 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s dropped (discouraged)\n", addr.ToStringAddrPort());
1828 : 0 : return;
1829 : : }
1830 : :
1831 [ # # ]: 0 : if (nInbound >= m_max_inbound)
1832 : : {
1833 [ # # ]: 0 : if (!AttemptToEvictConnection()) {
1834 : : // No connection to evict, disconnect the new connection
1835 [ # # ]: 0 : LogDebug(BCLog::NET, "failed to find an eviction candidate - connection dropped (full)\n");
1836 : 0 : return;
1837 : : }
1838 : : }
1839 : :
1840 : 0 : NodeId id = GetNewNodeId();
1841 : 0 : uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
1842 : :
1843 : : // The V2Transport transparently falls back to V1 behavior when an incoming V1 connection is
1844 : : // detected, so use it whenever we signal NODE_P2P_V2.
1845 : 0 : ServiceFlags local_services = GetLocalServices();
1846 : 0 : const bool use_v2transport(local_services & NODE_P2P_V2);
1847 : :
1848 : 0 : uint64_t network_id = GetDeterministicRandomizer(RANDOMIZER_ID_NETWORKKEY)
1849 [ # # ]: 0 : .Write(inbound_onion ? NET_ONION : addr.GetNetClass())
1850 [ # # # # ]: 0 : .Write(addr_bind.GetAddrBytes())
1851 [ # # # # ]: 0 : .Write(addr_bind.GetPort()) // inbound connections use bind port
1852 [ # # ]: 0 : .Finalize();
1853 : 0 : CNode* pnode = new CNode(id,
1854 : 0 : std::move(sock),
1855 [ # # ]: 0 : CAddress{addr, NODE_NONE},
1856 : : CalculateKeyedNetGroup(addr),
1857 : : nonce,
1858 : : addr_bind,
1859 : 0 : /*addrNameIn=*/"",
1860 : : ConnectionType::INBOUND,
1861 : : inbound_onion,
1862 : : network_id,
1863 : 0 : CNodeOptions{
1864 : : .permission_flags = permission_flags,
1865 : : .prefer_evict = discouraged,
1866 : 0 : .recv_flood_size = nReceiveFloodSize,
1867 : : .use_v2transport = use_v2transport,
1868 [ # # # # : 0 : });
# # # # ]
1869 : 0 : pnode->AddRef();
1870 : 0 : m_msgproc->InitializeNode(*pnode, local_services);
1871 : 0 : {
1872 : 0 : LOCK(m_nodes_mutex);
1873 [ # # ]: 0 : m_nodes.push_back(pnode);
1874 : 0 : }
1875 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s accepted\n", addr.ToStringAddrPort());
1876 : : TRACEPOINT(net, inbound_connection,
1877 : : pnode->GetId(),
1878 : : pnode->m_addr_name.c_str(),
1879 : : pnode->ConnectionTypeAsString().c_str(),
1880 : : pnode->ConnectedThroughNetwork(),
1881 : 0 : GetNodeCount(ConnectionDirection::In));
1882 : :
1883 : : // We received a new connection, harvest entropy from the time (and our peer count)
1884 : 0 : RandAddEvent((uint32_t)id);
1885 : : }
1886 : :
1887 : 0 : bool CConnman::AddConnection(const std::string& address, ConnectionType conn_type, bool use_v2transport = false)
1888 : : {
1889 : 0 : AssertLockNotHeld(m_nodes_mutex);
1890 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
1891 : 0 : std::optional<int> max_connections;
1892 [ # # # # ]: 0 : switch (conn_type) {
1893 : : case ConnectionType::INBOUND:
1894 : : case ConnectionType::MANUAL:
1895 : : case ConnectionType::PRIVATE_BROADCAST:
1896 : : return false;
1897 : 0 : case ConnectionType::OUTBOUND_FULL_RELAY:
1898 : 0 : max_connections = m_max_outbound_full_relay;
1899 : 0 : break;
1900 : 0 : case ConnectionType::BLOCK_RELAY:
1901 : 0 : max_connections = m_max_outbound_block_relay;
1902 : 0 : break;
1903 : : // no limit for ADDR_FETCH because -seednode has no limit either
1904 : : case ConnectionType::ADDR_FETCH:
1905 : : break;
1906 : : // no limit for FEELER connections since they're short-lived
1907 : : case ConnectionType::FEELER:
1908 : : break;
1909 : : } // no default case, so the compiler can warn about missing cases
1910 : :
1911 : : // Count existing connections
1912 [ # # # # ]: 0 : int existing_connections = WITH_LOCK(m_nodes_mutex,
1913 : : return std::count_if(m_nodes.begin(), m_nodes.end(), [conn_type](CNode* node) { return node->m_conn_type == conn_type; }););
1914 : :
1915 : : // Max connections of specified type already exist
1916 [ # # ]: 0 : if (max_connections != std::nullopt && existing_connections >= max_connections) return false;
1917 : :
1918 : : // Max total outbound connections already exist
1919 : 0 : CountingSemaphoreGrant<> grant(*semOutbound, true);
1920 [ # # ]: 0 : if (!grant) return false;
1921 : :
1922 [ # # # # ]: 0 : OpenNetworkConnection(/*addrConnect=*/CAddress{},
1923 : : /*fCountFailure=*/false,
1924 : : /*grant_outbound=*/std::move(grant),
1925 : : /*pszDest=*/address.c_str(),
1926 : : /*conn_type=*/conn_type,
1927 : : /*use_v2transport=*/use_v2transport,
1928 [ # # ]: 0 : /*proxy_override=*/std::nullopt);
1929 : 0 : return true;
1930 : : }
1931 : :
1932 : 0 : void CConnman::DisconnectNodes()
1933 : : {
1934 : 0 : AssertLockNotHeld(m_nodes_mutex);
1935 : 0 : AssertLockNotHeld(m_reconnections_mutex);
1936 : :
1937 : : // Use a temporary variable to accumulate desired reconnections, so we don't need
1938 : : // m_reconnections_mutex while holding m_nodes_mutex.
1939 [ # # ]: 0 : decltype(m_reconnections) reconnections_to_add;
1940 : :
1941 : 0 : {
1942 [ # # ]: 0 : LOCK(m_nodes_mutex);
1943 : :
1944 [ # # ]: 0 : const bool network_active{fNetworkActive};
1945 [ # # ]: 0 : if (!network_active) {
1946 : : // Disconnect any connected nodes
1947 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
1948 [ # # ]: 0 : if (!pnode->fDisconnect) {
1949 [ # # # # : 0 : LogDebug(BCLog::NET, "Network not active, %s", pnode->DisconnectMsg());
# # # # ]
1950 : 0 : pnode->fDisconnect = true;
1951 : : }
1952 : : }
1953 : : }
1954 : :
1955 : : // Disconnect unused nodes
1956 [ # # ]: 0 : std::vector<CNode*> nodes_copy = m_nodes;
1957 [ # # ]: 0 : for (CNode* pnode : nodes_copy)
1958 : : {
1959 [ # # ]: 0 : if (pnode->fDisconnect)
1960 : : {
1961 : : // remove from m_nodes
1962 : 0 : m_nodes.erase(remove(m_nodes.begin(), m_nodes.end(), pnode), m_nodes.end());
1963 : :
1964 : : // Add to reconnection list if appropriate. We don't reconnect right here, because
1965 : : // the creation of a connection is a blocking operation (up to several seconds),
1966 : : // and we don't want to hold up the socket handler thread for that long.
1967 [ # # # # ]: 0 : if (network_active && pnode->m_transport->ShouldReconnectV1()) {
1968 : 0 : reconnections_to_add.push_back({
1969 : 0 : .proxy_override = pnode->m_proxy_override,
1970 : 0 : .addr_connect = pnode->addr,
1971 [ # # ]: 0 : .grant = std::move(pnode->grantOutbound),
1972 : 0 : .destination = pnode->m_dest,
1973 : 0 : .conn_type = pnode->m_conn_type,
1974 : : .use_v2transport = false});
1975 [ # # # # : 0 : LogDebug(BCLog::NET, "retrying with v1 transport protocol for peer=%d\n", pnode->GetId());
# # ]
1976 : : }
1977 : :
1978 : : // release outbound grant (if any)
1979 : 0 : pnode->grantOutbound.Release();
1980 : :
1981 : : // close socket and cleanup
1982 [ # # ]: 0 : pnode->CloseSocketDisconnect();
1983 : :
1984 : : // update connection count by network
1985 [ # # # # ]: 0 : if (pnode->IsManualOrFullOutboundConn()) --m_network_conn_counts[pnode->addr.GetNetwork()];
1986 : :
1987 : : // hold in disconnected pool until all refs are released
1988 [ # # ]: 0 : pnode->Release();
1989 [ # # ]: 0 : m_nodes_disconnected.push_back(pnode);
1990 : : }
1991 : : }
1992 [ # # ]: 0 : }
1993 : 0 : {
1994 : : // Delete disconnected nodes
1995 [ # # ]: 0 : std::list<CNode*> nodes_disconnected_copy = m_nodes_disconnected;
1996 [ # # ]: 0 : for (CNode* pnode : nodes_disconnected_copy)
1997 : : {
1998 : : // Destroy the object only after other threads have stopped using it.
1999 [ # # ]: 0 : if (pnode->GetRefCount() <= 0) {
2000 : 0 : m_nodes_disconnected.remove(pnode);
2001 [ # # ]: 0 : DeleteNode(pnode);
2002 : : }
2003 : : }
2004 : 0 : }
2005 : 0 : {
2006 : : // Move entries from reconnections_to_add to m_reconnections.
2007 [ # # ]: 0 : LOCK(m_reconnections_mutex);
2008 [ # # ]: 0 : m_reconnections.splice(m_reconnections.end(), std::move(reconnections_to_add));
2009 : 0 : }
2010 [ # # # # : 0 : }
# # # # #
# ]
2011 : :
2012 : 0 : void CConnman::NotifyNumConnectionsChanged()
2013 : : {
2014 : 0 : AssertLockNotHeld(m_nodes_mutex);
2015 : :
2016 : 0 : size_t nodes_size;
2017 : 0 : {
2018 : 0 : LOCK(m_nodes_mutex);
2019 [ # # # # ]: 0 : nodes_size = m_nodes.size();
2020 : 0 : }
2021 [ # # ]: 0 : if(nodes_size != nPrevNodeCount) {
2022 : 0 : nPrevNodeCount = nodes_size;
2023 [ # # ]: 0 : if (m_client_interface) {
2024 : 0 : m_client_interface->NotifyNumConnectionsChanged(nodes_size);
2025 : : }
2026 : : }
2027 : 0 : }
2028 : :
2029 : 6 : bool CConnman::ShouldRunInactivityChecks(const CNode& node, NodeClock::time_point now) const
2030 : : {
2031 : 6 : return node.m_connected + m_peer_connect_timeout < now;
2032 : : }
2033 : :
2034 : 0 : bool CConnman::InactivityCheck(const CNode& node, NodeClock::time_point now) const
2035 : : {
2036 : : // Tests that see disconnects after using mocktime can start nodes with a
2037 : : // large timeout. For example, -peertimeout=999999999.
2038 : 0 : const auto last_send{node.m_last_send.load()};
2039 : 0 : const auto last_recv{node.m_last_recv.load()};
2040 : :
2041 [ # # ]: 0 : if (!ShouldRunInactivityChecks(node, now)) return false;
2042 : :
2043 [ # # ]: 0 : bool has_received{last_recv > NodeClock::epoch};
2044 : 0 : bool has_sent{last_send > NodeClock::epoch};
2045 : :
2046 [ # # ]: 0 : if (!has_received || !has_sent) {
2047 [ # # ]: 0 : std::string has_never;
2048 [ # # # # ]: 0 : if (!has_received) has_never += ", never received from peer";
2049 [ # # # # ]: 0 : if (!has_sent) has_never += ", never sent to peer";
2050 [ # # # # : 0 : LogDebug(BCLog::NET,
# # # # ]
2051 : : "socket no message in first %i seconds%s, %s",
2052 : : count_seconds(m_peer_connect_timeout),
2053 : : has_never,
2054 : : node.DisconnectMsg()
2055 : : );
2056 : 0 : return true;
2057 : 0 : }
2058 : :
2059 [ # # ]: 0 : if (now > last_send + TIMEOUT_INTERVAL) {
2060 [ # # # # ]: 0 : LogDebug(BCLog::NET,
2061 : : "socket sending timeout: %is, %s", Ticks<std::chrono::seconds>(now - last_send),
2062 : : node.DisconnectMsg()
2063 : : );
2064 : 0 : return true;
2065 : : }
2066 : :
2067 [ # # ]: 0 : if (now > last_recv + TIMEOUT_INTERVAL) {
2068 [ # # # # ]: 0 : LogDebug(BCLog::NET,
2069 : : "socket receive timeout: %is, %s", Ticks<std::chrono::seconds>(now - last_recv),
2070 : : node.DisconnectMsg()
2071 : : );
2072 : 0 : return true;
2073 : : }
2074 : :
2075 [ # # ]: 0 : if (!node.fSuccessfullyConnected) {
2076 [ # # ]: 0 : if (node.m_transport->GetInfo().transport_type == TransportProtocolType::DETECTING) {
2077 [ # # # # ]: 0 : LogDebug(BCLog::NET, "V2 handshake timeout, %s", node.DisconnectMsg());
2078 : : } else {
2079 [ # # # # ]: 0 : LogDebug(BCLog::NET, "version handshake timeout, %s", node.DisconnectMsg());
2080 : : }
2081 : 0 : return true;
2082 : : }
2083 : :
2084 : : return false;
2085 : : }
2086 : :
2087 : 0 : Sock::EventsPerSock CConnman::GenerateWaitSockets(std::span<CNode* const> nodes)
2088 : : {
2089 : 0 : Sock::EventsPerSock events_per_sock;
2090 : :
2091 [ # # ]: 0 : for (const ListenSocket& hListenSocket : vhListenSocket) {
2092 [ # # ]: 0 : events_per_sock.emplace(hListenSocket.sock, Sock::Events{Sock::RECV});
2093 : : }
2094 : :
2095 [ # # ]: 0 : for (CNode* pnode : nodes) {
2096 [ # # ]: 0 : bool select_recv = !pnode->fPauseRecv;
2097 : 0 : bool select_send;
2098 : 0 : {
2099 [ # # ]: 0 : LOCK(pnode->cs_vSend);
2100 : : // Sending is possible if either there are bytes to send right now, or if there will be
2101 : : // once a potential message from vSendMsg is handed to the transport. GetBytesToSend
2102 : : // determines both of these in a single call.
2103 [ # # ]: 0 : const auto& [to_send, more, _msg_type] = pnode->m_transport->GetBytesToSend(!pnode->vSendMsg.empty());
2104 [ # # # # : 0 : select_send = !to_send.empty() || more;
# # ]
2105 : 0 : }
2106 [ # # ]: 0 : if (!select_recv && !select_send) continue;
2107 : :
2108 [ # # ]: 0 : LOCK(pnode->m_sock_mutex);
2109 [ # # ]: 0 : if (pnode->m_sock) {
2110 [ # # # # ]: 0 : Sock::Event event = (select_send ? Sock::SEND : 0) | (select_recv ? Sock::RECV : 0);
2111 [ # # ]: 0 : events_per_sock.emplace(pnode->m_sock, Sock::Events{event});
2112 : : }
2113 : 0 : }
2114 : :
2115 : 0 : return events_per_sock;
2116 : 0 : }
2117 : :
2118 : 0 : void CConnman::SocketHandler()
2119 : : {
2120 : 0 : AssertLockNotHeld(m_nodes_mutex);
2121 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2122 : :
2123 [ # # ]: 0 : Sock::EventsPerSock events_per_sock;
2124 : :
2125 : 0 : {
2126 [ # # ]: 0 : const NodesSnapshot snap{*this, /*shuffle=*/false};
2127 : :
2128 : 0 : const auto timeout = std::chrono::milliseconds(SELECT_TIMEOUT_MILLISECONDS);
2129 : :
2130 : : // Check for the readiness of the already connected sockets and the
2131 : : // listening sockets in one call ("readiness" as in poll(2) or
2132 : : // select(2)). If none are ready, wait for a short while and return
2133 : : // empty sets.
2134 [ # # # # ]: 0 : events_per_sock = GenerateWaitSockets(snap.Nodes());
2135 [ # # # # : 0 : if (events_per_sock.empty() || !events_per_sock.begin()->first->WaitMany(timeout, events_per_sock)) {
# # ]
2136 [ # # ]: 0 : m_interrupt_net->sleep_for(timeout);
2137 : : }
2138 : :
2139 : : // Service (send/receive) each of the already connected nodes.
2140 [ # # ]: 0 : SocketHandlerConnected(snap.Nodes(), events_per_sock);
2141 : 0 : }
2142 : :
2143 : : // Accept new connections from listening sockets.
2144 [ # # ]: 0 : SocketHandlerListening(events_per_sock);
2145 : 0 : }
2146 : :
2147 : 0 : void CConnman::SocketHandlerConnected(const std::vector<CNode*>& nodes,
2148 : : const Sock::EventsPerSock& events_per_sock)
2149 : : {
2150 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2151 : :
2152 : 0 : const auto now{NodeClock::now()};
2153 : :
2154 [ # # ]: 0 : for (CNode* pnode : nodes) {
2155 [ # # ]: 0 : if (m_interrupt_net->interrupted()) {
2156 : : return;
2157 : : }
2158 : :
2159 : : //
2160 : : // Receive
2161 : : //
2162 : 0 : bool recvSet = false;
2163 : 0 : bool sendSet = false;
2164 : 0 : bool errorSet = false;
2165 : 0 : {
2166 : 0 : LOCK(pnode->m_sock_mutex);
2167 [ # # ]: 0 : if (!pnode->m_sock) {
2168 [ # # ]: 0 : continue;
2169 : : }
2170 [ # # # # ]: 0 : const auto it = events_per_sock.find(pnode->m_sock);
2171 [ # # # # ]: 0 : if (it != events_per_sock.end()) {
2172 : 0 : recvSet = it->second.occurred & Sock::RECV;
2173 : 0 : sendSet = it->second.occurred & Sock::SEND;
2174 : 0 : errorSet = it->second.occurred & Sock::ERR;
2175 : : }
2176 : 0 : }
2177 : :
2178 [ # # ]: 0 : if (sendSet) {
2179 : : // Send data
2180 [ # # # # ]: 0 : auto [bytes_sent, data_left] = WITH_LOCK(pnode->cs_vSend, return SocketSendData(*pnode));
2181 [ # # ]: 0 : if (bytes_sent) {
2182 : 0 : RecordBytesSent(bytes_sent);
2183 : :
2184 : : // If both receiving and (non-optimistic) sending were possible, we first attempt
2185 : : // sending. If that succeeds, but does not fully drain the send queue, do not
2186 : : // attempt to receive. This avoids needlessly queueing data if the remote peer
2187 : : // is slow at receiving data, by means of TCP flow control. We only do this when
2188 : : // sending actually succeeded to make sure progress is always made; otherwise a
2189 : : // deadlock would be possible when both sides have data to send, but neither is
2190 : : // receiving.
2191 [ # # ]: 0 : if (data_left) recvSet = false;
2192 : : }
2193 : : }
2194 : :
2195 [ # # ]: 0 : if (recvSet || errorSet)
2196 : : {
2197 : : // typical socket buffer is 8K-64K
2198 : 0 : uint8_t pchBuf[0x10000];
2199 : 0 : int nBytes = 0;
2200 : 0 : {
2201 : 0 : LOCK(pnode->m_sock_mutex);
2202 [ # # ]: 0 : if (!pnode->m_sock) {
2203 [ # # ]: 0 : continue;
2204 : : }
2205 [ # # # # ]: 0 : nBytes = pnode->m_sock->Recv(pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
2206 : 0 : }
2207 [ # # ]: 0 : if (nBytes > 0)
2208 : : {
2209 : 0 : bool notify = false;
2210 [ # # ]: 0 : if (!pnode->ReceiveMsgBytes({pchBuf, (size_t)nBytes}, notify)) {
2211 [ # # # # ]: 0 : LogDebug(BCLog::NET,
2212 : : "receiving message bytes failed, %s",
2213 : : pnode->DisconnectMsg()
2214 : : );
2215 : 0 : pnode->CloseSocketDisconnect();
2216 : : }
2217 : 0 : RecordBytesRecv(nBytes);
2218 [ # # ]: 0 : if (notify) {
2219 : 0 : pnode->MarkReceivedMsgsForProcessing();
2220 : 0 : WakeMessageHandler();
2221 : : }
2222 : : }
2223 [ # # ]: 0 : else if (nBytes == 0)
2224 : : {
2225 : : // socket closed gracefully
2226 [ # # ]: 0 : if (!pnode->fDisconnect) {
2227 [ # # # # ]: 0 : LogDebug(BCLog::NET, "socket closed, %s", pnode->DisconnectMsg());
2228 : : }
2229 : 0 : pnode->CloseSocketDisconnect();
2230 : : }
2231 [ # # ]: 0 : else if (nBytes < 0)
2232 : : {
2233 : : // error
2234 : 0 : int nErr = WSAGetLastError();
2235 [ # # # # ]: 0 : if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
2236 : : {
2237 [ # # ]: 0 : if (!pnode->fDisconnect) {
2238 [ # # # # : 0 : LogDebug(BCLog::NET, "socket recv error, %s: %s", pnode->DisconnectMsg(), NetworkErrorString(nErr));
# # ]
2239 : : }
2240 : 0 : pnode->CloseSocketDisconnect();
2241 : : }
2242 : : }
2243 : : }
2244 : :
2245 [ # # ]: 0 : if (InactivityCheck(*pnode, now)) pnode->fDisconnect = true;
2246 : : }
2247 : : }
2248 : :
2249 : 0 : void CConnman::SocketHandlerListening(const Sock::EventsPerSock& events_per_sock)
2250 : : {
2251 : 0 : AssertLockNotHeld(m_nodes_mutex);
2252 : :
2253 [ # # ]: 0 : for (const ListenSocket& listen_socket : vhListenSocket) {
2254 [ # # ]: 0 : if (m_interrupt_net->interrupted()) {
2255 : : return;
2256 : : }
2257 [ # # # # ]: 0 : const auto it = events_per_sock.find(listen_socket.sock);
2258 [ # # # # ]: 0 : if (it != events_per_sock.end() && it->second.occurred & Sock::RECV) {
2259 : 0 : AcceptConnection(listen_socket);
2260 : : }
2261 : : }
2262 : : }
2263 : :
2264 : 1 : void CConnman::ThreadSocketHandler()
2265 : : {
2266 : 1 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2267 : :
2268 [ - + ]: 1 : while (!m_interrupt_net->interrupted()) {
2269 : 0 : DisconnectNodes();
2270 : 0 : NotifyNumConnectionsChanged();
2271 : 0 : SocketHandler();
2272 : : }
2273 : 1 : }
2274 : :
2275 : 1 : void CConnman::WakeMessageHandler()
2276 : : {
2277 : 1 : {
2278 : 1 : LOCK(mutexMsgProc);
2279 [ + - ]: 1 : fMsgProcWake = true;
2280 : 1 : }
2281 : 1 : condMsgProc.notify_one();
2282 : 1 : }
2283 : :
2284 : 0 : void CConnman::ThreadDNSAddressSeed()
2285 : : {
2286 : 0 : int outbound_connection_count = 0;
2287 : :
2288 [ # # # # ]: 0 : if (!gArgs.GetArgs("-seednode").empty()) {
2289 : 0 : auto start = NodeClock::now();
2290 : 0 : constexpr std::chrono::seconds SEEDNODE_TIMEOUT = 30s;
2291 : 0 : LogInfo("-seednode enabled. Trying the provided seeds for %d seconds before defaulting to the dnsseeds.\n", SEEDNODE_TIMEOUT.count());
2292 [ # # ]: 0 : while (!m_interrupt_net->interrupted()) {
2293 [ # # ]: 0 : if (!m_interrupt_net->sleep_for(500ms)) {
2294 : : return;
2295 : : }
2296 : :
2297 : : // Abort if we have spent enough time without reaching our target.
2298 : : // Giving seed nodes 30 seconds so this does not become a race against fixedseeds (which triggers after 1 min)
2299 [ # # ]: 0 : if (NodeClock::now() > start + SEEDNODE_TIMEOUT) {
2300 : 0 : LogInfo("Couldn't connect to enough peers via seed nodes. Handing fetch logic to the DNS seeds.\n");
2301 : 0 : break;
2302 : : }
2303 : :
2304 : 0 : outbound_connection_count = GetFullOutboundConnCount();
2305 [ # # ]: 0 : if (outbound_connection_count >= SEED_OUTBOUND_CONNECTION_THRESHOLD) {
2306 : 0 : LogInfo("P2P peers available. Finished fetching data from seed nodes.\n");
2307 : 0 : break;
2308 : : }
2309 : : }
2310 : : }
2311 : :
2312 : 0 : FastRandomContext rng;
2313 [ # # ]: 0 : std::vector<std::string> seeds = m_params.DNSSeeds();
2314 : 0 : std::shuffle(seeds.begin(), seeds.end(), rng);
2315 : 0 : int seeds_right_now = 0; // Number of seeds left before testing if we have enough connections
2316 : :
2317 [ # # # # : 0 : if (gArgs.GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED)) {
# # ]
2318 : : // When -forcednsseed is provided, query all.
2319 [ # # ]: 0 : seeds_right_now = seeds.size();
2320 [ # # # # ]: 0 : } else if (addrman.get().Size() == 0) {
2321 : : // If we have no known peers, query all.
2322 : : // This will occur on the first run, or if peers.dat has been
2323 : : // deleted.
2324 [ # # ]: 0 : seeds_right_now = seeds.size();
2325 : : }
2326 : :
2327 : : // Proceed with dnsseeds if seednodes hasn't reached the target or if forcednsseed is set
2328 [ # # ]: 0 : if (outbound_connection_count < SEED_OUTBOUND_CONNECTION_THRESHOLD || seeds_right_now) {
2329 : : // goal: only query DNS seed if address need is acute
2330 : : // * If we have a reasonable number of peers in addrman, spend
2331 : : // some time trying them first. This improves user privacy by
2332 : : // creating fewer identifying DNS requests, reduces trust by
2333 : : // giving seeds less influence on the network topology, and
2334 : : // reduces traffic to the seeds.
2335 : : // * When querying DNS seeds query a few at once, this ensures
2336 : : // that we don't give DNS seeds the ability to eclipse nodes
2337 : : // that query them.
2338 : : // * If we continue having problems, eventually query all the
2339 : : // DNS seeds, and if that fails too, also try the fixed seeds.
2340 : : // (done in ThreadOpenConnections)
2341 : 0 : int found = 0;
2342 [ # # # # ]: 0 : const std::chrono::seconds seeds_wait_time = (addrman.get().Size() >= DNSSEEDS_DELAY_PEER_THRESHOLD ? DNSSEEDS_DELAY_MANY_PEERS : DNSSEEDS_DELAY_FEW_PEERS);
2343 : :
2344 [ # # ]: 0 : for (const std::string& seed : seeds) {
2345 [ # # ]: 0 : if (seeds_right_now == 0) {
2346 : 0 : seeds_right_now += DNSSEEDS_TO_QUERY_AT_ONCE;
2347 : :
2348 [ # # # # ]: 0 : if (addrman.get().Size() > 0) {
2349 [ # # ]: 0 : LogInfo("Waiting %d seconds before querying DNS seeds.\n", seeds_wait_time.count());
2350 : 0 : std::chrono::seconds to_wait = seeds_wait_time;
2351 [ # # ]: 0 : while (to_wait.count() > 0) {
2352 : : // if sleeping for the MANY_PEERS interval, wake up
2353 : : // early to see if we have enough peers and can stop
2354 : : // this thread entirely freeing up its resources
2355 : 0 : std::chrono::seconds w = std::min(DNSSEEDS_DELAY_FEW_PEERS, to_wait);
2356 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(w)) return;
2357 [ # # ]: 0 : to_wait -= w;
2358 : :
2359 [ # # # # ]: 0 : if (GetFullOutboundConnCount() >= SEED_OUTBOUND_CONNECTION_THRESHOLD) {
2360 [ # # ]: 0 : if (found > 0) {
2361 [ # # ]: 0 : LogInfo("%d addresses found from DNS seeds\n", found);
2362 [ # # ]: 0 : LogInfo("P2P peers available. Finished DNS seeding.\n");
2363 : : } else {
2364 [ # # ]: 0 : LogInfo("P2P peers available. Skipped DNS seeding.\n");
2365 : : }
2366 : 0 : return;
2367 : : }
2368 : : }
2369 : : }
2370 : : }
2371 : :
2372 [ # # # # ]: 0 : if (m_interrupt_net->interrupted()) return;
2373 : :
2374 : : // hold off on querying seeds if P2P network deactivated
2375 [ # # ]: 0 : if (!fNetworkActive) {
2376 [ # # ]: 0 : LogInfo("Waiting for network to be reactivated before querying DNS seeds.\n");
2377 : 0 : do {
2378 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(1s)) return;
2379 [ # # ]: 0 : } while (!fNetworkActive);
2380 : : }
2381 : :
2382 [ # # ]: 0 : LogInfo("Loading addresses from DNS seed %s\n", seed);
2383 : : // If -proxy is in use, we make an ADDR_FETCH connection to the DNS resolved peer address
2384 : : // for the base dns seed domain in chainparams
2385 [ # # # # ]: 0 : if (HaveNameProxy()) {
2386 [ # # ]: 0 : AddAddrFetch(seed);
2387 : : } else {
2388 : 0 : std::vector<CAddress> vAdd;
2389 : 0 : constexpr ServiceFlags requiredServiceBits{SeedsServiceFlags()};
2390 [ # # ]: 0 : std::string host = strprintf("x%x.%s", requiredServiceBits, seed);
2391 [ # # ]: 0 : CNetAddr resolveSource;
2392 [ # # # # ]: 0 : if (!resolveSource.SetInternal(host)) {
2393 : 0 : continue;
2394 : : }
2395 : : // Limit number of IPs learned from a single DNS seed. This limit exists to prevent the results from
2396 : : // one DNS seed from dominating AddrMan. Note that the number of results from a UDP DNS query is
2397 : : // bounded to 33 already, but it is possible for it to use TCP where a larger number of results can be
2398 : : // returned.
2399 : 0 : unsigned int nMaxIPs = 32;
2400 [ # # # # ]: 0 : const auto addresses{LookupHost(host, nMaxIPs, true)};
2401 [ # # ]: 0 : if (!addresses.empty()) {
2402 [ # # ]: 0 : for (const CNetAddr& ip : addresses) {
2403 [ # # ]: 0 : CAddress addr = CAddress(CService(ip, m_params.GetDefaultPort()), requiredServiceBits);
2404 : 0 : addr.nTime = rng.rand_uniform_delay(Now<NodeSeconds>() - 3 * 24h, -4 * 24h); // use a random age between 3 and 7 days old
2405 [ # # ]: 0 : vAdd.push_back(addr);
2406 : 0 : found++;
2407 : 0 : }
2408 [ # # ]: 0 : addrman.get().Add(vAdd, resolveSource);
2409 : : } else {
2410 : : // If the seed does not support a subdomain with our desired service bits,
2411 : : // we make an ADDR_FETCH connection to the DNS resolved peer address for the
2412 : : // base dns seed domain in chainparams
2413 [ # # ]: 0 : AddAddrFetch(seed);
2414 : : }
2415 : 0 : }
2416 : 0 : --seeds_right_now;
2417 : : }
2418 [ # # ]: 0 : LogInfo("%d addresses found from DNS seeds\n", found);
2419 : : } else {
2420 [ # # ]: 0 : LogInfo("Skipping DNS seeds. Enough peers have been found\n");
2421 : : }
2422 : 0 : }
2423 : :
2424 : 1 : void CConnman::DumpAddresses()
2425 : : {
2426 : 1 : const auto start{SteadyClock::now()};
2427 : :
2428 : 1 : DumpPeerAddresses(::gArgs, addrman);
2429 : :
2430 [ + - ]: 1 : LogDebug(BCLog::NET, "Flushed %d addresses to peers.dat %dms",
2431 : : addrman.get().Size(), Ticks<std::chrono::milliseconds>(SteadyClock::now() - start));
2432 : 1 : }
2433 : :
2434 : 0 : void CConnman::ProcessAddrFetch()
2435 : : {
2436 : 0 : AssertLockNotHeld(m_nodes_mutex);
2437 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2438 [ # # ]: 0 : std::string strDest;
2439 : 0 : {
2440 [ # # ]: 0 : LOCK(m_addr_fetches_mutex);
2441 [ # # ]: 0 : if (m_addr_fetches.empty())
2442 [ # # ]: 0 : return;
2443 [ # # ]: 0 : strDest = m_addr_fetches.front();
2444 [ # # ]: 0 : m_addr_fetches.pop_front();
2445 : 0 : }
2446 : : // Attempt v2 connection if we support v2 - we'll reconnect with v1 if our
2447 : : // peer doesn't support it or immediately disconnects us for another reason.
2448 [ # # ]: 0 : const bool use_v2transport(GetLocalServices() & NODE_P2P_V2);
2449 [ # # ]: 0 : CAddress addr;
2450 : 0 : CountingSemaphoreGrant<> grant(*semOutbound, /*fTry=*/true);
2451 [ # # ]: 0 : if (grant) {
2452 : 0 : OpenNetworkConnection(/*addrConnect=*/addr,
2453 : : /*fCountFailure=*/false,
2454 : : /*grant_outbound=*/std::move(grant),
2455 : : /*pszDest=*/strDest.c_str(),
2456 : : /*conn_type=*/ConnectionType::ADDR_FETCH,
2457 : : /*use_v2transport=*/use_v2transport,
2458 [ # # ]: 0 : /*proxy_override=*/std::nullopt);
2459 : : }
2460 : 0 : }
2461 : :
2462 : 3 : bool CConnman::GetTryNewOutboundPeer() const
2463 : : {
2464 : 3 : return m_try_another_outbound_peer;
2465 : : }
2466 : :
2467 : 164 : void CConnman::SetTryNewOutboundPeer(bool flag)
2468 : : {
2469 : 164 : m_try_another_outbound_peer = flag;
2470 [ + - + + ]: 327 : LogDebug(BCLog::NET, "setting try another outbound peer=%s\n", flag ? "true" : "false");
2471 : 164 : }
2472 : :
2473 : 0 : void CConnman::StartExtraBlockRelayPeers()
2474 : : {
2475 [ # # ]: 0 : LogDebug(BCLog::NET, "enabling extra block-relay-only peers\n");
2476 : 0 : m_start_extra_block_relay_peers = true;
2477 : 0 : }
2478 : :
2479 : : // Return the number of outbound connections that are full relay (not blocks only)
2480 : 0 : int CConnman::GetFullOutboundConnCount() const
2481 : : {
2482 : 0 : AssertLockNotHeld(m_nodes_mutex);
2483 : :
2484 : 0 : int nRelevant = 0;
2485 : 0 : {
2486 : 0 : LOCK(m_nodes_mutex);
2487 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
2488 [ # # # # ]: 0 : if (pnode->fSuccessfullyConnected && pnode->IsFullOutboundConn()) ++nRelevant;
2489 : : }
2490 : 0 : }
2491 : 0 : return nRelevant;
2492 : : }
2493 : :
2494 : : // Return the number of peers we have over our outbound connection limit
2495 : : // Exclude peers that are marked for disconnect, or are going to be
2496 : : // disconnected soon (eg ADDR_FETCH and FEELER)
2497 : : // Also exclude peers that haven't finished initial connection handshake yet
2498 : : // (so that we don't decide we're over our desired connection limit, and then
2499 : : // evict some peer that has finished the handshake)
2500 : 10 : int CConnman::GetExtraFullOutboundCount() const
2501 : : {
2502 : 10 : AssertLockNotHeld(m_nodes_mutex);
2503 : :
2504 : 10 : int full_outbound_peers = 0;
2505 : 10 : {
2506 : 10 : LOCK(m_nodes_mutex);
2507 [ + + ]: 76 : for (const CNode* pnode : m_nodes) {
2508 [ + - + + : 66 : if (pnode->fSuccessfullyConnected && !pnode->fDisconnect && pnode->IsFullOutboundConn()) {
+ + ]
2509 : 54 : ++full_outbound_peers;
2510 : : }
2511 : : }
2512 : 10 : }
2513 [ + + ]: 10 : return std::max(full_outbound_peers - m_max_outbound_full_relay, 0);
2514 : : }
2515 : :
2516 : 10 : int CConnman::GetExtraBlockRelayCount() const
2517 : : {
2518 : 10 : AssertLockNotHeld(m_nodes_mutex);
2519 : :
2520 : 10 : int block_relay_peers = 0;
2521 : 10 : {
2522 : 10 : LOCK(m_nodes_mutex);
2523 [ + + ]: 76 : for (const CNode* pnode : m_nodes) {
2524 [ + - + + : 66 : if (pnode->fSuccessfullyConnected && !pnode->fDisconnect && pnode->IsBlockOnlyConn()) {
+ + ]
2525 : 11 : ++block_relay_peers;
2526 : : }
2527 : : }
2528 : 10 : }
2529 [ + + ]: 10 : return std::max(block_relay_peers - m_max_outbound_block_relay, 0);
2530 : : }
2531 : :
2532 : 0 : std::unordered_set<Network> CConnman::GetReachableEmptyNetworks() const
2533 : : {
2534 : 0 : std::unordered_set<Network> networks{};
2535 [ # # ]: 0 : for (int n = 0; n < NET_MAX; n++) {
2536 : 0 : enum Network net = (enum Network)n;
2537 [ # # ]: 0 : if (net == NET_UNROUTABLE || net == NET_INTERNAL) continue;
2538 [ # # # # : 0 : if (g_reachable_nets.Contains(net) && addrman.get().Size(net, std::nullopt) == 0) {
# # # # ]
2539 [ # # ]: 0 : networks.insert(net);
2540 : : }
2541 : : }
2542 : 0 : return networks;
2543 : 0 : }
2544 : :
2545 : 38 : bool CConnman::MultipleManualOrFullOutboundConns(Network net) const
2546 : : {
2547 : 38 : AssertLockHeld(m_nodes_mutex);
2548 : 38 : return m_network_conn_counts[net] > 1;
2549 : : }
2550 : :
2551 : 0 : bool CConnman::MaybePickPreferredNetwork(std::optional<Network>& network)
2552 : : {
2553 : 0 : AssertLockNotHeld(m_nodes_mutex);
2554 : :
2555 : 0 : std::array<Network, 5> nets{NET_IPV4, NET_IPV6, NET_ONION, NET_I2P, NET_CJDNS};
2556 : 0 : std::shuffle(nets.begin(), nets.end(), FastRandomContext());
2557 : :
2558 : 0 : LOCK(m_nodes_mutex);
2559 [ # # ]: 0 : for (const auto net : nets) {
2560 [ # # # # : 0 : if (g_reachable_nets.Contains(net) && m_network_conn_counts[net] == 0 && addrman.get().Size(net) != 0) {
# # # # #
# ]
2561 : 0 : network = net;
2562 : 0 : return true;
2563 : : }
2564 : : }
2565 : :
2566 : : return false;
2567 : 0 : }
2568 : :
2569 : 1 : void CConnman::ThreadOpenConnections(const std::vector<std::string> connect, std::span<const std::string> seed_nodes)
2570 : : {
2571 : 1 : AssertLockNotHeld(m_nodes_mutex);
2572 : 1 : AssertLockNotHeld(m_reconnections_mutex);
2573 : 1 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2574 : :
2575 : 1 : FastRandomContext rng;
2576 : : // Connect to specific addresses
2577 [ - + ]: 1 : if (!connect.empty())
2578 : : {
2579 : : // Attempt v2 connection if we support v2 - we'll reconnect with v1 if our
2580 : : // peer doesn't support it or immediately disconnects us for another reason.
2581 [ # # ]: 0 : const bool use_v2transport(GetLocalServices() & NODE_P2P_V2);
2582 : 0 : for (int64_t nLoop = 0;; nLoop++)
2583 : : {
2584 [ # # ]: 0 : for (const std::string& strAddr : connect)
2585 : : {
2586 [ # # # # ]: 0 : OpenNetworkConnection(/*addrConnect=*/CAddress{CService{}, NODE_NONE},
2587 : : /*fCountFailure=*/false,
2588 : : /*grant_outbound=*/{},
2589 : : /*pszDest=*/strAddr.c_str(),
2590 : : /*conn_type=*/ConnectionType::MANUAL,
2591 : : /*use_v2transport=*/use_v2transport,
2592 [ # # ]: 0 : /*proxy_override=*/std::nullopt);
2593 [ # # # # ]: 0 : for (int i = 0; i < 10 && i < nLoop; i++)
2594 : : {
2595 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(500ms)) {
2596 : : return;
2597 : : }
2598 : : }
2599 : : }
2600 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(500ms)) {
2601 : : return;
2602 : : }
2603 [ # # ]: 0 : PerformReconnections();
2604 : 0 : }
2605 : : }
2606 : :
2607 : : // Initiate network connections
2608 : 1 : auto start = GetTime<std::chrono::microseconds>();
2609 : :
2610 : : // Minimum time before next feeler connection (in microseconds).
2611 : 1 : auto next_feeler = start + rng.rand_exp_duration(FEELER_INTERVAL);
2612 : 1 : auto next_extra_block_relay = start + rng.rand_exp_duration(EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL);
2613 [ + - ]: 1 : auto next_extra_network_peer{start + rng.rand_exp_duration(EXTRA_NETWORK_PEER_INTERVAL)};
2614 [ + - + - ]: 1 : const bool dnsseed = gArgs.GetBoolArg("-dnsseed", DEFAULT_DNSSEED);
2615 [ + - + - ]: 1 : bool add_fixed_seeds = gArgs.GetBoolArg("-fixedseeds", DEFAULT_FIXEDSEEDS);
2616 [ + - + - ]: 1 : const bool use_seednodes{!gArgs.GetArgs("-seednode").empty()};
2617 : :
2618 : 1 : auto seed_node_timer = NodeClock::now();
2619 [ + - + - : 1 : bool add_addr_fetch{addrman.get().Size() == 0 && !seed_nodes.empty()};
+ - ]
2620 : 1 : constexpr std::chrono::seconds ADD_NEXT_SEEDNODE = 10s;
2621 : :
2622 [ - + ]: 1 : if (!add_fixed_seeds) {
2623 [ # # ]: 0 : LogInfo("Fixed seeds are disabled\n");
2624 : : }
2625 : :
2626 [ + - - + ]: 1 : while (!m_interrupt_net->interrupted()) {
2627 [ # # ]: 0 : if (add_addr_fetch) {
2628 : 0 : add_addr_fetch = false;
2629 : 0 : const auto& seed{SpanPopBack(seed_nodes)};
2630 [ # # ]: 0 : AddAddrFetch(seed);
2631 : :
2632 [ # # # # ]: 0 : if (addrman.get().Size() == 0) {
2633 [ # # ]: 0 : LogInfo("Empty addrman, adding seednode (%s) to addrfetch\n", seed);
2634 : : } else {
2635 [ # # ]: 0 : LogInfo("Couldn't connect to peers from addrman after %d seconds. Adding seednode (%s) to addrfetch\n", ADD_NEXT_SEEDNODE.count(), seed);
2636 : : }
2637 : : }
2638 : :
2639 [ # # ]: 0 : ProcessAddrFetch();
2640 : :
2641 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(500ms)) {
2642 : : return;
2643 : : }
2644 : :
2645 [ # # ]: 0 : PerformReconnections();
2646 : :
2647 : 0 : CountingSemaphoreGrant<> grant(*semOutbound);
2648 [ # # # # ]: 0 : if (m_interrupt_net->interrupted()) {
2649 : : return;
2650 : : }
2651 : :
2652 [ # # ]: 0 : const std::unordered_set<Network> fixed_seed_networks{GetReachableEmptyNetworks()};
2653 [ # # # # ]: 0 : if (add_fixed_seeds && !fixed_seed_networks.empty()) {
2654 : : // When the node starts with an empty peers.dat, there are a few other sources of peers before
2655 : : // we fallback on to fixed seeds: -dnsseed, -seednode, -addnode
2656 : : // If none of those are available, we fallback on to fixed seeds immediately, else we allow
2657 : : // 60 seconds for any of those sources to populate addrman.
2658 : 0 : bool add_fixed_seeds_now = false;
2659 : : // It is cheapest to check if enough time has passed first.
2660 [ # # ]: 0 : if (GetTime<std::chrono::seconds>() > start + std::chrono::minutes{1}) {
2661 : 0 : add_fixed_seeds_now = true;
2662 [ # # ]: 0 : LogInfo("Adding fixed seeds as 60 seconds have passed and addrman is empty for at least one reachable network\n");
2663 : : }
2664 : :
2665 : : // Perform cheap checks before locking a mutex.
2666 [ # # ]: 0 : else if (!dnsseed && !use_seednodes) {
2667 [ # # ]: 0 : LOCK(m_added_nodes_mutex);
2668 [ # # ]: 0 : if (m_added_node_params.empty()) {
2669 : 0 : add_fixed_seeds_now = true;
2670 [ # # # # ]: 0 : LogInfo("Adding fixed seeds as -dnsseed=0 (or IPv4/IPv6 connections are disabled via -onlynet) and neither -addnode nor -seednode are provided\n");
2671 : : }
2672 : 0 : }
2673 : :
2674 [ # # ]: 0 : if (add_fixed_seeds_now) {
2675 [ # # ]: 0 : std::vector<CAddress> seed_addrs{ConvertSeeds(m_params.FixedSeeds())};
2676 : : // We will not make outgoing connections to peers that are unreachable
2677 : : // (e.g. because of -onlynet configuration).
2678 : : // Therefore, we do not add them to addrman in the first place.
2679 : : // In case previously unreachable networks become reachable
2680 : : // (e.g. in case of -onlynet changes by the user), fixed seeds will
2681 : : // be loaded only for networks for which we have no addresses.
2682 [ # # ]: 0 : seed_addrs.erase(std::remove_if(seed_addrs.begin(), seed_addrs.end(),
2683 : 0 : [&fixed_seed_networks](const CAddress& addr) { return !fixed_seed_networks.contains(addr.GetNetwork()); }),
2684 [ # # ]: 0 : seed_addrs.end());
2685 [ # # ]: 0 : CNetAddr local;
2686 [ # # # # ]: 0 : local.SetInternal("fixedseeds");
2687 [ # # ]: 0 : addrman.get().Add(seed_addrs, local);
2688 : 0 : add_fixed_seeds = false;
2689 [ # # # # ]: 0 : LogInfo("Added %d fixed seeds from reachable networks.\n", seed_addrs.size());
2690 : 0 : }
2691 : : }
2692 : :
2693 : : //
2694 : : // Choose an address to connect to based on most recently seen
2695 : : //
2696 [ # # ]: 0 : CAddress addrConnect;
2697 : :
2698 : : // Only connect out to one peer per ipv4/ipv6 network group (/16 for IPv4).
2699 : 0 : int nOutboundFullRelay = 0;
2700 : 0 : int nOutboundBlockRelay = 0;
2701 : 0 : int outbound_privacy_network_peers = 0;
2702 [ # # ]: 0 : std::set<std::vector<unsigned char>> outbound_ipv46_peer_netgroups;
2703 : :
2704 : 0 : {
2705 [ # # ]: 0 : LOCK(m_nodes_mutex);
2706 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
2707 [ # # ]: 0 : if (pnode->IsFullOutboundConn()) nOutboundFullRelay++;
2708 [ # # ]: 0 : if (pnode->IsBlockOnlyConn()) nOutboundBlockRelay++;
2709 : :
2710 : : // Make sure our persistent outbound slots to ipv4/ipv6 peers belong to different netgroups.
2711 [ # # ]: 0 : switch (pnode->m_conn_type) {
2712 : : // We currently don't take inbound connections into account. Since they are
2713 : : // free to make, an attacker could make them to prevent us from connecting to
2714 : : // certain peers.
2715 : : case ConnectionType::INBOUND:
2716 : : // Short-lived outbound connections should not affect how we select outbound
2717 : : // peers from addrman.
2718 : : case ConnectionType::ADDR_FETCH:
2719 : : case ConnectionType::FEELER:
2720 : : case ConnectionType::PRIVATE_BROADCAST:
2721 : : break;
2722 : 0 : case ConnectionType::MANUAL:
2723 : 0 : case ConnectionType::OUTBOUND_FULL_RELAY:
2724 : 0 : case ConnectionType::BLOCK_RELAY:
2725 : 0 : const CAddress address{pnode->addr};
2726 [ # # # # : 0 : if (address.IsTor() || address.IsI2P() || address.IsCJDNS()) {
# # ]
2727 : : // Since our addrman-groups for these networks are
2728 : : // random, without relation to the route we
2729 : : // take to connect to these peers or to the
2730 : : // difficulty in obtaining addresses with diverse
2731 : : // groups, we don't worry about diversity with
2732 : : // respect to our addrman groups when connecting to
2733 : : // these networks.
2734 : 0 : ++outbound_privacy_network_peers;
2735 : : } else {
2736 [ # # # # ]: 0 : outbound_ipv46_peer_netgroups.insert(m_netgroupman.GetGroup(address));
2737 : : }
2738 : : } // no default case, so the compiler can warn about missing cases
2739 : : }
2740 : 0 : }
2741 : :
2742 [ # # # # ]: 0 : if (!seed_nodes.empty() && nOutboundFullRelay < SEED_OUTBOUND_CONNECTION_THRESHOLD) {
2743 [ # # ]: 0 : if (NodeClock::now() > seed_node_timer + ADD_NEXT_SEEDNODE) {
2744 : 0 : seed_node_timer = NodeClock::now();
2745 : 0 : add_addr_fetch = true;
2746 : : }
2747 : : }
2748 : :
2749 : 0 : ConnectionType conn_type = ConnectionType::OUTBOUND_FULL_RELAY;
2750 : 0 : auto now = GetTime<std::chrono::microseconds>();
2751 : 0 : bool anchor = false;
2752 : 0 : bool fFeeler = false;
2753 : 0 : std::optional<Network> preferred_net;
2754 : :
2755 : : // Determine what type of connection to open. Opening
2756 : : // BLOCK_RELAY connections to addresses from anchors.dat gets the highest
2757 : : // priority. Then we open OUTBOUND_FULL_RELAY priority until we
2758 : : // meet our full-relay capacity. Then we open BLOCK_RELAY connection
2759 : : // until we hit our block-relay-only peer limit.
2760 : : // GetTryNewOutboundPeer() gets set when a stale tip is detected, so we
2761 : : // try opening an additional OUTBOUND_FULL_RELAY connection. If none of
2762 : : // these conditions are met, check to see if it's time to try an extra
2763 : : // block-relay-only peer (to confirm our tip is current, see below) or the next_feeler
2764 : : // timer to decide if we should open a FEELER.
2765 : :
2766 [ # # # # ]: 0 : if (!m_anchors.empty() && (nOutboundBlockRelay < m_max_outbound_block_relay)) {
2767 : : conn_type = ConnectionType::BLOCK_RELAY;
2768 : : anchor = true;
2769 [ # # ]: 0 : } else if (nOutboundFullRelay < m_max_outbound_full_relay) {
2770 : : // OUTBOUND_FULL_RELAY
2771 [ # # ]: 0 : } else if (nOutboundBlockRelay < m_max_outbound_block_relay) {
2772 : : conn_type = ConnectionType::BLOCK_RELAY;
2773 [ # # # # ]: 0 : } else if (GetTryNewOutboundPeer()) {
2774 : : // OUTBOUND_FULL_RELAY
2775 [ # # # # ]: 0 : } else if (now > next_extra_block_relay && m_start_extra_block_relay_peers) {
2776 : : // Periodically connect to a peer (using regular outbound selection
2777 : : // methodology from addrman) and stay connected long enough to sync
2778 : : // headers, but not much else.
2779 : : //
2780 : : // Then disconnect the peer, if we haven't learned anything new.
2781 : : //
2782 : : // The idea is to make eclipse attacks very difficult to pull off,
2783 : : // because every few minutes we're finding a new peer to learn headers
2784 : : // from.
2785 : : //
2786 : : // This is similar to the logic for trying extra outbound (full-relay)
2787 : : // peers, except:
2788 : : // - we do this all the time on an exponential timer, rather than just when
2789 : : // our tip is stale
2790 : : // - we potentially disconnect our next-youngest block-relay-only peer, if our
2791 : : // newest block-relay-only peer delivers a block more recently.
2792 : : // See the eviction logic in net_processing.cpp.
2793 : : //
2794 : : // Because we can promote these connections to block-relay-only
2795 : : // connections, they do not get their own ConnectionType enum
2796 : : // (similar to how we deal with extra outbound peers).
2797 : 0 : next_extra_block_relay = now + rng.rand_exp_duration(EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL);
2798 : 0 : conn_type = ConnectionType::BLOCK_RELAY;
2799 [ # # ]: 0 : } else if (now > next_feeler) {
2800 : 0 : next_feeler = now + rng.rand_exp_duration(FEELER_INTERVAL);
2801 : 0 : conn_type = ConnectionType::FEELER;
2802 : 0 : fFeeler = true;
2803 [ # # ]: 0 : } else if (nOutboundFullRelay == m_max_outbound_full_relay &&
2804 [ # # ]: 0 : m_max_outbound_full_relay == MAX_OUTBOUND_FULL_RELAY_CONNECTIONS &&
2805 [ # # # # : 0 : now > next_extra_network_peer &&
# # ]
2806 [ # # ]: 0 : MaybePickPreferredNetwork(preferred_net)) {
2807 : : // Full outbound connection management: Attempt to get at least one
2808 : : // outbound peer from each reachable network by making extra connections
2809 : : // and then protecting "only" peers from a network during outbound eviction.
2810 : : // This is not attempted if the user changed -maxconnections to a value
2811 : : // so low that less than MAX_OUTBOUND_FULL_RELAY_CONNECTIONS are made,
2812 : : // to prevent interactions with otherwise protected outbound peers.
2813 : 0 : next_extra_network_peer = now + rng.rand_exp_duration(EXTRA_NETWORK_PEER_INTERVAL);
2814 : : } else {
2815 : : // skip to next iteration of while loop
2816 : 0 : continue;
2817 : : }
2818 : :
2819 [ # # ]: 0 : addrman.get().ResolveCollisions();
2820 : :
2821 : 0 : const auto current_time{NodeClock::now()};
2822 : 0 : int nTries = 0;
2823 [ # # ]: 0 : const auto reachable_nets{g_reachable_nets.All()};
2824 : :
2825 [ # # # # ]: 0 : while (!m_interrupt_net->interrupted()) {
2826 [ # # # # ]: 0 : if (anchor && !m_anchors.empty()) {
2827 : 0 : const CAddress addr = m_anchors.back();
2828 : 0 : m_anchors.pop_back();
2829 [ # # # # : 0 : if (!addr.IsValid() || IsLocal(addr) || !g_reachable_nets.Contains(addr) ||
# # # # #
# # # #
# ]
2830 [ # # # # : 0 : !m_msgproc->HasAllDesirableServiceFlags(addr.nServices) ||
# # ]
2831 [ # # ]: 0 : outbound_ipv46_peer_netgroups.contains(m_netgroupman.GetGroup(addr))) continue;
2832 : 0 : addrConnect = addr;
2833 [ # # # # : 0 : LogDebug(BCLog::NET, "Trying to make an anchor connection to %s\n", addrConnect.ToStringAddrPort());
# # # # ]
2834 : 0 : break;
2835 : 0 : }
2836 : :
2837 : : // If we didn't find an appropriate destination after trying 100 addresses fetched from addrman,
2838 : : // stop this loop, and let the outer loop run again (which sleeps, adds seed nodes, recalculates
2839 : : // already-connected network ranges, ...) before trying new addrman addresses.
2840 : 0 : nTries++;
2841 [ # # ]: 0 : if (nTries > 100)
2842 : : break;
2843 : :
2844 [ # # ]: 0 : CAddress addr;
2845 : 0 : NodeSeconds addr_last_try{0s};
2846 : :
2847 [ # # ]: 0 : if (fFeeler) {
2848 : : // First, try to get a tried table collision address. This returns
2849 : : // an empty (invalid) address if there are no collisions to try.
2850 [ # # ]: 0 : std::tie(addr, addr_last_try) = addrman.get().SelectTriedCollision();
2851 : :
2852 [ # # # # ]: 0 : if (!addr.IsValid()) {
2853 : : // No tried table collisions. Select a new table address
2854 : : // for our feeler.
2855 [ # # ]: 0 : std::tie(addr, addr_last_try) = addrman.get().Select(true, reachable_nets);
2856 [ # # # # ]: 0 : } else if (AlreadyConnectedToAddress(addr)) {
2857 : : // If test-before-evict logic would have us connect to a
2858 : : // peer that we're already connected to, just mark that
2859 : : // address as Good(). We won't be able to initiate the
2860 : : // connection anyway, so this avoids inadvertently evicting
2861 : : // a currently-connected peer.
2862 [ # # ]: 0 : addrman.get().Good(addr);
2863 : : // Select a new table address for our feeler instead.
2864 [ # # ]: 0 : std::tie(addr, addr_last_try) = addrman.get().Select(true, reachable_nets);
2865 : : }
2866 : : } else {
2867 : : // Not a feeler
2868 : : // If preferred_net has a value set, pick an extra outbound
2869 : : // peer from that network. The eviction logic in net_processing
2870 : : // ensures that a peer from another network will be evicted.
2871 [ # # ]: 0 : std::tie(addr, addr_last_try) = preferred_net.has_value()
2872 [ # # # # : 0 : ? addrman.get().Select(false, {*preferred_net})
# # # # #
# # # ]
2873 [ # # ]: 0 : : addrman.get().Select(false, reachable_nets);
2874 : : }
2875 : :
2876 : : // Require outbound IPv4/IPv6 connections, other than feelers, to be to distinct network groups
2877 [ # # # # : 0 : if (!fFeeler && outbound_ipv46_peer_netgroups.contains(m_netgroupman.GetGroup(addr))) {
# # # # ]
2878 : 0 : continue;
2879 : : }
2880 : :
2881 : : // if we selected an invalid or local address, restart
2882 [ # # # # : 0 : if (!addr.IsValid() || IsLocal(addr)) {
# # # # ]
2883 : : break;
2884 : : }
2885 : :
2886 [ # # # # ]: 0 : if (!g_reachable_nets.Contains(addr)) {
2887 : 0 : continue;
2888 : : }
2889 : :
2890 : : // only consider very recently tried nodes after 30 failed attempts
2891 [ # # # # ]: 0 : if (current_time - addr_last_try < 10min && nTries < 30) {
2892 : 0 : continue;
2893 : : }
2894 : :
2895 : : // for non-feelers, require all the services we'll want,
2896 : : // for feelers, only require they be a full node (only because most
2897 : : // SPV clients don't have a good address DB available)
2898 [ # # # # : 0 : if (!fFeeler && !m_msgproc->HasAllDesirableServiceFlags(addr.nServices)) {
# # ]
2899 : 0 : continue;
2900 [ # # # # ]: 0 : } else if (fFeeler && !MayHaveUsefulAddressDB(addr.nServices)) {
2901 : 0 : continue;
2902 : : }
2903 : :
2904 : : // Do not connect to bad ports, unless 50 invalid addresses have been selected already.
2905 [ # # # # : 0 : if (nTries < 50 && (addr.IsIPv4() || addr.IsIPv6()) && IsBadPort(addr.GetPort())) {
# # # # #
# # # ]
2906 : 0 : continue;
2907 : : }
2908 : :
2909 : : // Do not make automatic outbound connections to addnode peers, to
2910 : : // not use our limited outbound slots for them and to ensure
2911 : : // addnode connections benefit from their intended protections.
2912 [ # # # # ]: 0 : if (AddedNodesContain(addr)) {
2913 [ # # # # : 0 : LogDebug(BCLog::NET, "Not making automatic %s%s connection to %s peer selected for manual (addnode) connection%s\n",
# # # # #
# # # # #
# # # # #
# # # # #
# # ]
2914 : : preferred_net.has_value() ? "network-specific " : "",
2915 : : ConnectionTypeAsString(conn_type), GetNetworkName(addr.GetNetwork()),
2916 : : fLogIPs ? strprintf(": %s", addr.ToStringAddrPort()) : "");
2917 : 0 : continue;
2918 : : }
2919 : :
2920 : 0 : addrConnect = addr;
2921 : : break;
2922 : 0 : }
2923 : :
2924 [ # # # # ]: 0 : if (addrConnect.IsValid()) {
2925 [ # # ]: 0 : if (fFeeler) {
2926 : : // Add small amount of random noise before connection to avoid synchronization.
2927 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(rng.rand_uniform_duration<CThreadInterrupt::Clock>(FEELER_SLEEP_WINDOW))) {
2928 : 0 : return;
2929 : : }
2930 [ # # # # : 0 : LogDebug(BCLog::NET, "Making feeler connection to %s\n", addrConnect.ToStringAddrPort());
# # # # ]
2931 : : }
2932 : :
2933 [ # # # # : 0 : if (preferred_net != std::nullopt) LogDebug(BCLog::NET, "Making network specific connection to %s on %s.\n", addrConnect.ToStringAddrPort(), GetNetworkName(preferred_net.value()));
# # # # #
# # # #
# ]
2934 : :
2935 : : // Record addrman failure attempts when node has at least 2 persistent outbound connections to peers with
2936 : : // different netgroups in ipv4/ipv6 networks + all peers in Tor/I2P/CJDNS networks.
2937 : : // Don't record addrman failure attempts when node is offline. This can be identified since all local
2938 : : // network connections (if any) belong in the same netgroup, and the size of `outbound_ipv46_peer_netgroups` would only be 1.
2939 [ # # ]: 0 : const bool count_failures{((int)outbound_ipv46_peer_netgroups.size() + outbound_privacy_network_peers) >= std::min(m_max_automatic_connections - 1, 2)};
2940 : : // Use BIP324 transport when both us and them have NODE_V2_P2P set.
2941 [ # # ]: 0 : const bool use_v2transport(addrConnect.nServices & GetLocalServices() & NODE_P2P_V2);
2942 : 0 : OpenNetworkConnection(/*addrConnect=*/addrConnect,
2943 : : /*fCountFailure=*/count_failures,
2944 : : /*grant_outbound=*/std::move(grant),
2945 : : /*pszDest=*/nullptr,
2946 : : /*conn_type=*/conn_type,
2947 : : /*use_v2transport=*/use_v2transport,
2948 [ # # ]: 0 : /*proxy_override=*/std::nullopt);
2949 : : }
2950 : 0 : }
2951 : 1 : }
2952 : :
2953 : 1 : std::vector<CAddress> CConnman::GetCurrentBlockRelayOnlyConns() const
2954 : : {
2955 : 1 : AssertLockNotHeld(m_nodes_mutex);
2956 : 1 : std::vector<CAddress> ret;
2957 [ + - ]: 1 : LOCK(m_nodes_mutex);
2958 [ - + ]: 1 : for (const CNode* pnode : m_nodes) {
2959 [ # # ]: 0 : if (pnode->IsBlockOnlyConn()) {
2960 [ # # ]: 0 : ret.push_back(pnode->addr);
2961 : : }
2962 : : }
2963 : :
2964 [ + - ]: 1 : return ret;
2965 : 1 : }
2966 : :
2967 : 4 : std::vector<AddedNodeInfo> CConnman::GetAddedNodeInfo(bool include_connected) const
2968 : : {
2969 : 4 : AssertLockNotHeld(m_nodes_mutex);
2970 : :
2971 : 4 : std::vector<AddedNodeInfo> ret;
2972 : :
2973 [ + - ]: 4 : std::list<AddedNodeParams> lAddresses(0);
2974 : 4 : {
2975 [ + - ]: 4 : LOCK(m_added_nodes_mutex);
2976 [ - + + - ]: 4 : ret.reserve(m_added_node_params.size());
2977 [ + - ]: 4 : std::copy(m_added_node_params.cbegin(), m_added_node_params.cend(), std::back_inserter(lAddresses));
2978 : 0 : }
2979 : :
2980 : :
2981 : : // Build a map of all already connected addresses (by IP:port and by name) to inbound/outbound and resolved CService
2982 [ + - ]: 4 : std::map<CService, bool> mapConnected;
2983 : 4 : std::map<std::string, std::pair<bool, CService>> mapConnectedByName;
2984 : 4 : {
2985 [ + - ]: 4 : LOCK(m_nodes_mutex);
2986 [ + + ]: 20 : for (const CNode* pnode : m_nodes) {
2987 [ + - + - ]: 16 : if (pnode->addr.IsValid()) {
2988 [ + - ]: 16 : mapConnected[pnode->addr] = pnode->IsInboundConn();
2989 : : }
2990 [ - + ]: 16 : std::string addrName{pnode->m_addr_name};
2991 [ + - ]: 16 : if (!addrName.empty()) {
2992 [ + - ]: 16 : mapConnectedByName[std::move(addrName)] = std::make_pair(pnode->IsInboundConn(), static_cast<const CService&>(pnode->addr));
2993 : : }
2994 : 16 : }
2995 : 0 : }
2996 : :
2997 [ + + ]: 19 : for (const auto& addr : lAddresses) {
2998 [ + - + - : 30 : CService service{MaybeFlipIPv6toCJDNS(LookupNumeric(addr.m_added_node, GetDefaultPort(addr.m_added_node)))};
+ - + - ]
2999 [ + - + - ]: 15 : AddedNodeInfo addedNode{addr, CService(), false, false};
3000 [ + - + - ]: 15 : if (service.IsValid()) {
3001 : : // strAddNode is an IP:port
3002 [ + - ]: 15 : auto it = mapConnected.find(service);
3003 [ + - ]: 15 : if (it != mapConnected.end()) {
3004 [ + + ]: 15 : if (!include_connected) {
3005 : 5 : continue;
3006 : : }
3007 : 10 : addedNode.resolvedAddress = service;
3008 : 10 : addedNode.fConnected = true;
3009 : 10 : addedNode.fInbound = it->second;
3010 : : }
3011 : : } else {
3012 : : // strAddNode is a name
3013 : 0 : auto it = mapConnectedByName.find(addr.m_added_node);
3014 [ # # ]: 0 : if (it != mapConnectedByName.end()) {
3015 [ # # ]: 0 : if (!include_connected) {
3016 : 0 : continue;
3017 : : }
3018 : 0 : addedNode.resolvedAddress = it->second.second;
3019 : 0 : addedNode.fConnected = true;
3020 : 0 : addedNode.fInbound = it->second.first;
3021 : : }
3022 : : }
3023 [ + - ]: 10 : ret.emplace_back(std::move(addedNode));
3024 : 15 : }
3025 : :
3026 : 4 : return ret;
3027 : 4 : }
3028 : :
3029 : 1 : void CConnman::ThreadOpenAddedConnections()
3030 : : {
3031 : 1 : AssertLockNotHeld(m_nodes_mutex);
3032 : 1 : AssertLockNotHeld(m_reconnections_mutex);
3033 : 1 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
3034 : :
3035 : 1 : while (true)
3036 : : {
3037 : 1 : CountingSemaphoreGrant<> grant(*semAddnode);
3038 [ + - ]: 1 : std::vector<AddedNodeInfo> vInfo = GetAddedNodeInfo(/*include_connected=*/false);
3039 : 1 : bool tried = false;
3040 [ - + ]: 1 : for (const AddedNodeInfo& info : vInfo) {
3041 [ # # ]: 0 : if (!grant) {
3042 : : // If we've used up our semaphore and need a new one, let's not wait here since while we are waiting
3043 : : // the addednodeinfo state might change.
3044 : : break;
3045 : : }
3046 : 0 : tried = true;
3047 [ # # # # ]: 0 : OpenNetworkConnection(/*addrConnect=*/CAddress{CService{}, NODE_NONE},
3048 : : /*fCountFailure=*/false,
3049 : : /*grant_outbound=*/std::move(grant),
3050 : : /*pszDest=*/info.m_params.m_added_node.c_str(),
3051 : : /*conn_type=*/ConnectionType::MANUAL,
3052 : 0 : /*use_v2transport=*/info.m_params.m_use_v2transport,
3053 [ # # ]: 0 : /*proxy_override=*/std::nullopt);
3054 [ # # # # ]: 0 : if (!m_interrupt_net->sleep_for(500ms)) return;
3055 : 0 : grant = CountingSemaphoreGrant<>(*semAddnode, /*fTry=*/true);
3056 : : }
3057 : : // See if any reconnections are desired.
3058 [ + - ]: 1 : PerformReconnections();
3059 : : // Retry every 60 seconds if a connection was attempted, otherwise two seconds
3060 [ - + + - : 1 : if (!m_interrupt_net->sleep_for(tried ? 60s : 2s)) {
- + ]
3061 : : return;
3062 : : }
3063 : 1 : }
3064 : : }
3065 : :
3066 : : // if successful, this moves the passed grant to the constructed node
3067 : 0 : bool CConnman::OpenNetworkConnection(const CAddress& addrConnect,
3068 : : bool fCountFailure,
3069 : : CountingSemaphoreGrant<>&& grant_outbound,
3070 : : const char* pszDest,
3071 : : ConnectionType conn_type,
3072 : : bool use_v2transport,
3073 : : const std::optional<Proxy>& proxy_override)
3074 : : {
3075 : 0 : AssertLockNotHeld(m_nodes_mutex);
3076 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
3077 [ # # ]: 0 : assert(conn_type != ConnectionType::INBOUND);
3078 : :
3079 : : //
3080 : : // Initiate outbound network connection
3081 : : //
3082 [ # # ]: 0 : if (m_interrupt_net->interrupted()) {
3083 : : return false;
3084 : : }
3085 [ # # ]: 0 : if (!fNetworkActive) {
3086 : : return false;
3087 : : }
3088 [ # # ]: 0 : if (!pszDest) {
3089 [ # # # # : 0 : bool banned_or_discouraged = m_banman && (m_banman->IsDiscouraged(addrConnect) || m_banman->IsBanned(addrConnect));
# # ]
3090 [ # # # # : 0 : if (IsLocal(addrConnect) || banned_or_discouraged || AlreadyConnectedToAddress(addrConnect)) {
# # ]
3091 : 0 : return false;
3092 : : }
3093 [ # # ]: 0 : } else if (AlreadyConnectedToHost(pszDest)) {
3094 : : return false;
3095 : : }
3096 : :
3097 [ # # ]: 0 : CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure, conn_type, use_v2transport, proxy_override);
3098 : :
3099 [ # # ]: 0 : if (!pnode)
3100 : : return false;
3101 : 0 : pnode->grantOutbound = std::move(grant_outbound);
3102 : :
3103 : 0 : m_msgproc->InitializeNode(*pnode, m_local_services);
3104 : 0 : {
3105 : 0 : LOCK(m_nodes_mutex);
3106 [ # # ]: 0 : m_nodes.push_back(pnode);
3107 : :
3108 : : // update connection count by network
3109 [ # # # # ]: 0 : if (pnode->IsManualOrFullOutboundConn()) ++m_network_conn_counts[pnode->addr.GetNetwork()];
3110 : 0 : }
3111 : :
3112 : : TRACEPOINT(net, outbound_connection,
3113 : : pnode->GetId(),
3114 : : pnode->m_addr_name.c_str(),
3115 : : pnode->ConnectionTypeAsString().c_str(),
3116 : : pnode->ConnectedThroughNetwork(),
3117 : 0 : GetNodeCount(ConnectionDirection::Out));
3118 : :
3119 : 0 : return true;
3120 : : }
3121 : :
3122 : 0 : std::optional<Network> CConnman::PrivateBroadcast::PickNetwork(std::optional<Proxy>& proxy) const
3123 : : {
3124 : 0 : prevector<4, Network> nets;
3125 : 0 : std::optional<Proxy> clearnet_proxy;
3126 [ # # ]: 0 : proxy.reset();
3127 [ # # # # ]: 0 : if (g_reachable_nets.Contains(NET_ONION)) {
3128 : 0 : nets.push_back(NET_ONION);
3129 : :
3130 [ # # # # ]: 0 : clearnet_proxy = ProxyForIPv4or6();
3131 [ # # ]: 0 : if (clearnet_proxy.has_value()) {
3132 [ # # # # ]: 0 : if (g_reachable_nets.Contains(NET_IPV4)) {
3133 : 0 : nets.push_back(NET_IPV4);
3134 : : }
3135 [ # # # # ]: 0 : if (g_reachable_nets.Contains(NET_IPV6)) {
3136 : 0 : nets.push_back(NET_IPV6);
3137 : : }
3138 : : }
3139 : : }
3140 [ # # # # ]: 0 : if (g_reachable_nets.Contains(NET_I2P)) {
3141 : 0 : nets.push_back(NET_I2P);
3142 : : }
3143 : :
3144 [ # # # # ]: 0 : if (nets.empty()) {
3145 : 0 : return std::nullopt;
3146 : : }
3147 : :
3148 [ # # # # ]: 0 : const Network net{nets[FastRandomContext{}.randrange(nets.size())]};
3149 [ # # ]: 0 : if (net == NET_IPV4 || net == NET_IPV6) {
3150 [ # # ]: 0 : proxy = clearnet_proxy;
3151 : : }
3152 : 0 : return net;
3153 : 0 : }
3154 : :
3155 : 0 : size_t CConnman::PrivateBroadcast::NumToOpen() const
3156 : : {
3157 : 0 : return m_num_to_open;
3158 : : }
3159 : :
3160 : 160 : void CConnman::PrivateBroadcast::NumToOpenAdd(size_t n)
3161 : : {
3162 : 160 : m_num_to_open += n;
3163 : 160 : m_num_to_open.notify_all();
3164 : 160 : }
3165 : :
3166 : 0 : size_t CConnman::PrivateBroadcast::NumToOpenSub(size_t n)
3167 : : {
3168 : 0 : size_t current_value{m_num_to_open.load()};
3169 : 0 : size_t new_value;
3170 : 0 : do {
3171 [ # # ]: 0 : new_value = current_value > n ? current_value - n : 0;
3172 [ # # ]: 0 : } while (!m_num_to_open.compare_exchange_strong(current_value, new_value));
3173 : 0 : return new_value;
3174 : : }
3175 : :
3176 : 0 : void CConnman::PrivateBroadcast::NumToOpenWait() const
3177 : : {
3178 : 0 : m_num_to_open.wait(0);
3179 : 0 : }
3180 : :
3181 : 0 : std::optional<Proxy> CConnman::PrivateBroadcast::ProxyForIPv4or6() const
3182 : : {
3183 [ # # ]: 0 : if (m_outbound_tor_ok_at_least_once.load()) {
3184 [ # # ]: 0 : if (const auto tor_proxy = GetProxy(NET_ONION)) {
3185 : : return tor_proxy;
3186 : 0 : }
3187 : : }
3188 : 0 : return std::nullopt;
3189 : : }
3190 : :
3191 : : Mutex NetEventsInterface::g_msgproc_mutex;
3192 : :
3193 : 1 : void CConnman::ThreadMessageHandler()
3194 : : {
3195 : 1 : AssertLockNotHeld(m_nodes_mutex);
3196 : :
3197 : 1 : LOCK(NetEventsInterface::g_msgproc_mutex);
3198 : :
3199 [ - + ]: 2 : while (!flagInterruptMsgProc)
3200 : : {
3201 : 0 : bool fMoreWork = false;
3202 : :
3203 : 0 : {
3204 : : // Randomize the order in which we process messages from/to our peers.
3205 : : // This prevents attacks in which an attacker exploits having multiple
3206 : : // consecutive connections in the m_nodes list.
3207 [ # # ]: 0 : const NodesSnapshot snap{*this, /*shuffle=*/true};
3208 : :
3209 [ # # ]: 0 : for (CNode* pnode : snap.Nodes()) {
3210 [ # # ]: 0 : if (pnode->fDisconnect)
3211 : 0 : continue;
3212 : :
3213 : : // Receive messages
3214 [ # # ]: 0 : bool fMoreNodeWork{m_msgproc->ProcessMessages(*pnode, flagInterruptMsgProc)};
3215 [ # # # # ]: 0 : fMoreWork |= (fMoreNodeWork && !pnode->fPauseSend);
3216 [ # # ]: 0 : if (flagInterruptMsgProc)
3217 : : return;
3218 : : // Send messages
3219 [ # # ]: 0 : m_msgproc->SendMessages(*pnode);
3220 : :
3221 [ # # ]: 0 : if (flagInterruptMsgProc)
3222 : : return;
3223 : : }
3224 [ # # ]: 0 : }
3225 : :
3226 [ # # ]: 0 : WAIT_LOCK(mutexMsgProc, lock);
3227 [ # # ]: 0 : if (!fMoreWork) {
3228 [ # # # # ]: 0 : condMsgProc.wait_until(lock, std::chrono::steady_clock::now() + std::chrono::milliseconds(100), [this]() EXCLUSIVE_LOCKS_REQUIRED(mutexMsgProc) { return fMsgProcWake; });
3229 : : }
3230 [ # # ]: 0 : fMsgProcWake = false;
3231 : 0 : }
3232 : 1 : }
3233 : :
3234 : 0 : void CConnman::ThreadI2PAcceptIncoming()
3235 : : {
3236 : 0 : AssertLockNotHeld(m_nodes_mutex);
3237 : :
3238 : 0 : static constexpr auto err_wait_begin = 1s;
3239 : 0 : static constexpr auto err_wait_cap = 5min;
3240 : 0 : auto err_wait = err_wait_begin;
3241 : :
3242 : 0 : bool advertising_listen_addr = false;
3243 : 0 : i2p::Connection conn;
3244 : :
3245 : 0 : auto SleepOnFailure = [&]() {
3246 : 0 : m_interrupt_net->sleep_for(err_wait);
3247 [ # # ]: 0 : if (err_wait < err_wait_cap) {
3248 : 0 : err_wait += 1s;
3249 : : }
3250 : 0 : };
3251 : :
3252 [ # # # # ]: 0 : while (!m_interrupt_net->interrupted()) {
3253 : :
3254 [ # # # # ]: 0 : if (!m_i2p_sam_session->Listen(conn)) {
3255 [ # # # # : 0 : if (advertising_listen_addr && conn.me.IsValid()) {
# # ]
3256 [ # # ]: 0 : RemoveLocal(conn.me);
3257 : : advertising_listen_addr = false;
3258 : : }
3259 [ # # ]: 0 : SleepOnFailure();
3260 : 0 : continue;
3261 : : }
3262 : :
3263 [ # # ]: 0 : if (!advertising_listen_addr) {
3264 [ # # ]: 0 : AddLocal(conn.me, LOCAL_MANUAL);
3265 : : advertising_listen_addr = true;
3266 : : }
3267 : :
3268 [ # # # # ]: 0 : if (!m_i2p_sam_session->Accept(conn)) {
3269 [ # # ]: 0 : SleepOnFailure();
3270 : 0 : continue;
3271 : : }
3272 : :
3273 [ # # ]: 0 : CreateNodeFromAcceptedSocket(std::move(conn.sock), NetPermissionFlags::None, conn.me, conn.peer);
3274 : :
3275 : 0 : err_wait = err_wait_begin;
3276 : : }
3277 : 0 : }
3278 : :
3279 : 0 : void CConnman::ThreadPrivateBroadcast()
3280 : : {
3281 : 0 : AssertLockNotHeld(m_nodes_mutex);
3282 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
3283 : :
3284 : 0 : size_t addrman_num_bad_addresses{0};
3285 [ # # ]: 0 : while (!m_interrupt_net->interrupted()) {
3286 : :
3287 [ # # ]: 0 : if (!fNetworkActive) {
3288 : 0 : m_interrupt_net->sleep_for(5s);
3289 : 0 : continue;
3290 : : }
3291 : :
3292 : 0 : CountingSemaphoreGrant<> conn_max_grant{m_private_broadcast.m_sem_conn_max}; // Would block if too many are opened.
3293 : :
3294 [ # # ]: 0 : m_private_broadcast.NumToOpenWait();
3295 : :
3296 [ # # # # ]: 0 : if (m_interrupt_net->interrupted()) {
3297 : : break;
3298 : : }
3299 : :
3300 : 0 : std::optional<Proxy> proxy;
3301 [ # # ]: 0 : const std::optional<Network> net{m_private_broadcast.PickNetwork(proxy)};
3302 [ # # ]: 0 : if (!net.has_value()) {
3303 [ # # ]: 0 : LogWarning("Unable to open -privatebroadcast connections: neither Tor nor I2P is reachable");
3304 [ # # ]: 0 : m_interrupt_net->sleep_for(5s);
3305 : 0 : continue;
3306 : : }
3307 : :
3308 [ # # # # : 0 : const auto [addr, _] = addrman.get().Select(/*new_only=*/false, {net.value()});
# # ]
3309 : :
3310 [ # # # # : 0 : if (!addr.IsValid() || IsLocal(addr)) {
# # # # ]
3311 : 0 : ++addrman_num_bad_addresses;
3312 [ # # ]: 0 : if (addrman_num_bad_addresses > 100) {
3313 [ # # # # : 0 : LogDebug(BCLog::PRIVBROADCAST, "Connections needed but addrman keeps returning bad addresses, will retry");
# # ]
3314 [ # # ]: 0 : m_interrupt_net->sleep_for(500ms);
3315 : : }
3316 : 0 : continue;
3317 : : }
3318 : 0 : addrman_num_bad_addresses = 0;
3319 : :
3320 [ # # ]: 0 : auto target_str{addr.ToStringAddrPort()};
3321 [ # # ]: 0 : if (proxy.has_value()) {
3322 [ # # # # ]: 0 : target_str += " through the proxy at " + proxy->ToString();
3323 : : }
3324 : :
3325 [ # # ]: 0 : const bool use_v2transport(addr.nServices & GetLocalServices() & NODE_P2P_V2);
3326 : :
3327 [ # # # # ]: 0 : if (OpenNetworkConnection(addr,
3328 : : /*fCountFailure=*/true,
3329 : : std::move(conn_max_grant),
3330 : : /*pszDest=*/nullptr,
3331 : : ConnectionType::PRIVATE_BROADCAST,
3332 : : use_v2transport,
3333 : : proxy)) {
3334 [ # # ]: 0 : const size_t remaining{m_private_broadcast.NumToOpenSub(1)};
3335 [ # # # # : 0 : LogDebug(BCLog::PRIVBROADCAST, "Socket connected to %s; remaining connections to open: %d", target_str, remaining);
# # ]
3336 : : } else {
3337 [ # # ]: 0 : const size_t remaining{m_private_broadcast.NumToOpen()};
3338 [ # # ]: 0 : if (remaining == 0) {
3339 [ # # # # : 0 : LogDebug(BCLog::PRIVBROADCAST, "Failed to connect to %s, will not retry, no more connections needed", target_str);
# # ]
3340 : : } else {
3341 [ # # # # : 0 : LogDebug(BCLog::PRIVBROADCAST, "Failed to connect to %s, will retry to a different address; remaining connections to open: %d", target_str, remaining);
# # ]
3342 [ # # ]: 0 : m_interrupt_net->sleep_for(100ms); // Prevent busy loop if OpenNetworkConnection() fails fast repeatedly.
3343 : : }
3344 : : }
3345 [ # # ]: 0 : }
3346 : 0 : }
3347 : :
3348 : 0 : bool CConnman::BindListenPort(const CService& addrBind, bilingual_str& strError, NetPermissionFlags permissions)
3349 : : {
3350 : 0 : int nOne = 1;
3351 : :
3352 : : // Create socket for listening for incoming connections
3353 : 0 : struct sockaddr_storage sockaddr;
3354 : 0 : socklen_t len = sizeof(sockaddr);
3355 [ # # ]: 0 : if (!addrBind.GetSockAddr((struct sockaddr*)&sockaddr, &len))
3356 : : {
3357 [ # # # # ]: 0 : strError = Untranslated(strprintf("Bind address family for %s not supported", addrBind.ToStringAddrPort()));
3358 : 0 : LogError("%s\n", strError.original);
3359 : 0 : return false;
3360 : : }
3361 : :
3362 : 0 : std::unique_ptr<Sock> sock = CreateSock(addrBind.GetSAFamily(), SOCK_STREAM, IPPROTO_TCP);
3363 [ # # ]: 0 : if (!sock) {
3364 [ # # # # : 0 : strError = Untranslated(strprintf("Couldn't open socket for incoming connections (socket returned error %s)", NetworkErrorString(WSAGetLastError())));
# # ]
3365 [ # # ]: 0 : LogError("%s\n", strError.original);
3366 : : return false;
3367 : : }
3368 : :
3369 : : // Allow binding if the port is still in TIME_WAIT state after
3370 : : // the program was closed and restarted.
3371 [ # # # # ]: 0 : if (sock->SetSockOpt(SOL_SOCKET, SO_REUSEADDR, &nOne, sizeof(int)) == SOCKET_ERROR) {
3372 [ # # # # : 0 : strError = Untranslated(strprintf("Error setting SO_REUSEADDR on socket: %s, continuing anyway", NetworkErrorString(WSAGetLastError())));
# # ]
3373 [ # # ]: 0 : LogInfo("%s\n", strError.original);
3374 : : }
3375 : :
3376 : : // some systems don't have IPV6_V6ONLY but are always v6only; others do have the option
3377 : : // and enable it by default or not. Try to enable it, if possible.
3378 [ # # ]: 0 : if (addrBind.IsIPv6()) {
3379 : : #ifdef IPV6_V6ONLY
3380 [ # # # # ]: 0 : if (sock->SetSockOpt(IPPROTO_IPV6, IPV6_V6ONLY, &nOne, sizeof(int)) == SOCKET_ERROR) {
3381 [ # # # # : 0 : strError = Untranslated(strprintf("Error setting IPV6_V6ONLY on socket: %s, continuing anyway", NetworkErrorString(WSAGetLastError())));
# # ]
3382 [ # # ]: 0 : LogInfo("%s\n", strError.original);
3383 : : }
3384 : : #endif
3385 : : #ifdef WIN32
3386 : : int nProtLevel = PROTECTION_LEVEL_UNRESTRICTED;
3387 : : if (sock->SetSockOpt(IPPROTO_IPV6, IPV6_PROTECTION_LEVEL, &nProtLevel, sizeof(int)) == SOCKET_ERROR) {
3388 : : strError = Untranslated(strprintf("Error setting IPV6_PROTECTION_LEVEL on socket: %s, continuing anyway", NetworkErrorString(WSAGetLastError())));
3389 : : LogInfo("%s\n", strError.original);
3390 : : }
3391 : : #endif
3392 : : }
3393 : :
3394 [ # # # # ]: 0 : if (sock->Bind(reinterpret_cast<struct sockaddr*>(&sockaddr), len) == SOCKET_ERROR) {
3395 : 0 : int nErr = WSAGetLastError();
3396 [ # # ]: 0 : if (nErr == WSAEADDRINUSE)
3397 [ # # # # ]: 0 : strError = strprintf(_("Unable to bind to %s on this computer. %s is probably already running."), addrBind.ToStringAddrPort(), CLIENT_NAME);
3398 : : else
3399 [ # # # # : 0 : strError = strprintf(_("Unable to bind to %s on this computer (bind returned error %s)"), addrBind.ToStringAddrPort(), NetworkErrorString(nErr));
# # ]
3400 [ # # ]: 0 : LogError("%s\n", strError.original);
3401 : : return false;
3402 : : }
3403 [ # # # # ]: 0 : LogInfo("Bound to %s\n", addrBind.ToStringAddrPort());
3404 : :
3405 : : // Listen for incoming connections
3406 [ # # # # ]: 0 : if (sock->Listen(SOMAXCONN) == SOCKET_ERROR)
3407 : : {
3408 [ # # # # ]: 0 : strError = strprintf(_("Listening for incoming connections failed (listen returned error %s)"), NetworkErrorString(WSAGetLastError()));
3409 [ # # ]: 0 : LogError("%s\n", strError.original);
3410 : : return false;
3411 : : }
3412 : :
3413 [ # # ]: 0 : vhListenSocket.emplace_back(std::move(sock), permissions);
3414 : : return true;
3415 : 0 : }
3416 : :
3417 : 1 : void Discover()
3418 : : {
3419 [ + - ]: 1 : if (!fDiscover)
3420 : : return;
3421 : :
3422 [ + + ]: 2 : for (const CNetAddr &addr: GetLocalAddresses()) {
3423 [ + - - + : 1 : if (AddLocal(addr, LOCAL_IF) && fLogIPs) {
- - ]
3424 [ # # # # ]: 0 : LogInfo("%s: %s\n", __func__, addr.ToStringAddr());
3425 : : }
3426 : : }
3427 : : }
3428 : :
3429 : 161 : void CConnman::SetNetworkActive(bool active)
3430 : : {
3431 : 161 : LogInfo("%s: %s\n", __func__, active);
3432 : :
3433 [ + + ]: 161 : if (fNetworkActive == active) {
3434 : : return;
3435 : : }
3436 : :
3437 [ - + ]: 2 : fNetworkActive = active;
3438 : :
3439 [ - + ]: 2 : if (m_client_interface) {
3440 : 0 : m_client_interface->NotifyNetworkActiveChanged(fNetworkActive);
3441 : : }
3442 : : }
3443 : :
3444 : 159 : CConnman::CConnman(uint64_t nSeed0In,
3445 : : uint64_t nSeed1In,
3446 : : AddrMan& addrman_in,
3447 : : const NetGroupManager& netgroupman,
3448 : : const CChainParams& params,
3449 : : bool network_active,
3450 : 159 : std::shared_ptr<CThreadInterrupt> interrupt_net)
3451 [ + - ]: 159 : : addrman(addrman_in)
3452 [ + - ]: 159 : , m_netgroupman{netgroupman}
3453 : 159 : , nSeed0(nSeed0In)
3454 : 159 : , nSeed1(nSeed1In)
3455 [ + - - - ]: 159 : , m_interrupt_net{interrupt_net}
3456 [ + - + - : 318 : , m_params(params)
+ - + - ]
3457 : : {
3458 [ + - ]: 159 : SetTryNewOutboundPeer(false);
3459 : :
3460 : 159 : Options connOptions;
3461 [ + - ]: 159 : Init(connOptions);
3462 [ + - ]: 159 : SetNetworkActive(network_active);
3463 : 159 : }
3464 : :
3465 : 0 : NodeId CConnman::GetNewNodeId()
3466 : : {
3467 : 0 : return nLastNodeId.fetch_add(1, std::memory_order_relaxed);
3468 : : }
3469 : :
3470 : 0 : uint16_t CConnman::GetDefaultPort(Network net) const
3471 : : {
3472 [ # # ]: 0 : return net == NET_I2P ? I2P_SAM31_PORT : m_params.GetDefaultPort();
3473 : : }
3474 : :
3475 : 44 : uint16_t CConnman::GetDefaultPort(const std::string& addr) const
3476 : : {
3477 : 44 : CNetAddr a;
3478 [ - + + - : 44 : return a.SetSpecial(addr) ? GetDefaultPort(a.GetNetwork()) : m_params.GetDefaultPort();
- + - - -
- ]
3479 : 44 : }
3480 : :
3481 : 0 : bool CConnman::Bind(const CService& addr_, unsigned int flags, NetPermissionFlags permissions)
3482 : : {
3483 : 0 : const CService addr{MaybeFlipIPv6toCJDNS(addr_)};
3484 : :
3485 [ # # ]: 0 : bilingual_str strError;
3486 [ # # # # ]: 0 : if (!BindListenPort(addr, strError, permissions)) {
3487 [ # # # # ]: 0 : if ((flags & BF_REPORT_ERROR) && m_client_interface) {
3488 [ # # ]: 0 : m_client_interface->ThreadSafeMessageBox(strError, CClientUIInterface::MSG_ERROR);
3489 : : }
3490 : 0 : return false;
3491 : : }
3492 : :
3493 [ # # # # : 0 : if (addr.IsRoutable() && fDiscover && !(flags & BF_DONT_ADVERTISE) && !NetPermissions::HasFlag(permissions, NetPermissionFlags::NoBan)) {
# # # # #
# ]
3494 [ # # ]: 0 : AddLocal(addr, LOCAL_BIND);
3495 : : }
3496 : :
3497 : : return true;
3498 : 0 : }
3499 : :
3500 : 0 : bool CConnman::InitBinds(const Options& options)
3501 : : {
3502 [ # # ]: 0 : for (const auto& addrBind : options.vBinds) {
3503 [ # # ]: 0 : if (!Bind(addrBind, BF_REPORT_ERROR, NetPermissionFlags::None)) {
3504 : : return false;
3505 : : }
3506 : : }
3507 [ # # ]: 0 : for (const auto& addrBind : options.vWhiteBinds) {
3508 [ # # ]: 0 : if (!Bind(addrBind.m_service, BF_REPORT_ERROR, addrBind.m_flags)) {
3509 : : return false;
3510 : : }
3511 : : }
3512 [ # # ]: 0 : for (const auto& addr_bind : options.onion_binds) {
3513 [ # # ]: 0 : if (!Bind(addr_bind, BF_REPORT_ERROR | BF_DONT_ADVERTISE, NetPermissionFlags::None)) {
3514 : : return false;
3515 : : }
3516 : : }
3517 [ # # ]: 0 : if (options.bind_on_any) {
3518 : : // Don't consider errors to bind on IPv6 "::" fatal because the host OS
3519 : : // may not have IPv6 support and the user did not explicitly ask us to
3520 : : // bind on that.
3521 : 0 : const CService ipv6_any{in6_addr(COMPAT_IN6ADDR_ANY_INIT), GetListenPort()}; // ::
3522 [ # # ]: 0 : Bind(ipv6_any, BF_NONE, NetPermissionFlags::None);
3523 : :
3524 : 0 : struct in_addr inaddr_any;
3525 : 0 : inaddr_any.s_addr = htonl(INADDR_ANY);
3526 [ # # # # ]: 0 : const CService ipv4_any{inaddr_any, GetListenPort()}; // 0.0.0.0
3527 [ # # # # ]: 0 : if (!Bind(ipv4_any, BF_REPORT_ERROR, NetPermissionFlags::None)) {
3528 : 0 : return false;
3529 : : }
3530 : 0 : }
3531 : : return true;
3532 : : }
3533 : :
3534 : 1 : bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
3535 : : {
3536 : 1 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3537 : 1 : Init(connOptions);
3538 : :
3539 [ - + - - ]: 1 : if (fListen && !InitBinds(connOptions)) {
3540 [ # # ]: 0 : if (m_client_interface) {
3541 [ # # ]: 0 : m_client_interface->ThreadSafeMessageBox(
3542 : 0 : _("Failed to listen on any port. Use -listen=0 if you want this."),
3543 : : CClientUIInterface::MSG_ERROR);
3544 : : }
3545 : 0 : return false;
3546 : : }
3547 : :
3548 [ + - ]: 1 : if (connOptions.m_i2p_accept_incoming) {
3549 [ - + ]: 1 : if (const auto i2p_sam = GetProxy(NET_I2P)) {
3550 [ # # ]: 0 : m_i2p_sam_session = std::make_unique<i2p::sam::Session>(gArgs.GetDataDirNet() / "i2p_private_key",
3551 [ # # ]: 0 : *i2p_sam, m_interrupt_net);
3552 : 1 : }
3553 : : }
3554 : :
3555 : : // 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)
3556 : 1 : std::vector<std::string> seed_nodes = connOptions.vSeedNodes;
3557 [ - + ]: 1 : if (!seed_nodes.empty()) {
3558 : 0 : std::shuffle(seed_nodes.begin(), seed_nodes.end(), FastRandomContext{});
3559 : : }
3560 : :
3561 [ + - ]: 1 : if (m_use_addrman_outgoing) {
3562 : : // Load addresses from anchors.dat
3563 [ + - + - ]: 3 : m_anchors = ReadAnchors(gArgs.GetDataDirNet() / ANCHORS_DATABASE_FILENAME);
3564 [ - + - + ]: 1 : if (m_anchors.size() > MAX_BLOCK_RELAY_ONLY_ANCHORS) {
3565 [ # # ]: 0 : m_anchors.resize(MAX_BLOCK_RELAY_ONLY_ANCHORS);
3566 : : }
3567 [ - + + - ]: 1 : LogInfo("%i block-relay-only anchors will be tried for connections.\n", m_anchors.size());
3568 : : }
3569 : :
3570 [ + - ]: 1 : if (m_client_interface) {
3571 [ + - + - ]: 2 : m_client_interface->InitMessage(_("Starting network threads…"));
3572 : : }
3573 : :
3574 : 1 : fAddressesInitialized = true;
3575 : :
3576 [ + - ]: 1 : if (semOutbound == nullptr) {
3577 : : // initialize semaphore
3578 [ - + + - ]: 1 : semOutbound = std::make_unique<std::counting_semaphore<>>(std::min(m_max_automatic_outbound, m_max_automatic_connections));
3579 : : }
3580 [ + - ]: 1 : if (semAddnode == nullptr) {
3581 : : // initialize semaphore
3582 [ + - ]: 1 : semAddnode = std::make_unique<std::counting_semaphore<>>(m_max_addnode);
3583 : : }
3584 : :
3585 : : //
3586 : : // Start threads
3587 : : //
3588 [ - + ]: 1 : assert(m_msgproc);
3589 [ + - ]: 1 : m_interrupt_net->reset();
3590 [ + - ]: 1 : flagInterruptMsgProc = false;
3591 : :
3592 : 1 : {
3593 [ + - ]: 1 : LOCK(mutexMsgProc);
3594 [ + - ]: 1 : fMsgProcWake = false;
3595 : 1 : }
3596 : :
3597 : : // Send and receive from sockets, accept connections
3598 [ + - ]: 2 : threadSocketHandler = std::thread(&util::TraceThread, "net", [this] { ThreadSocketHandler(); });
3599 : :
3600 [ + - + - : 1 : if (!gArgs.GetBoolArg("-dnsseed", DEFAULT_DNSSEED))
+ - ]
3601 [ + - ]: 1 : LogInfo("DNS seeding disabled\n");
3602 : : else
3603 [ # # ]: 0 : threadDNSAddressSeed = std::thread(&util::TraceThread, "dnsseed", [this] { ThreadDNSAddressSeed(); });
3604 : :
3605 : : // Initiate manual connections
3606 [ + - ]: 2 : threadOpenAddedConnections = std::thread(&util::TraceThread, "addcon", [this] { ThreadOpenAddedConnections(); });
3607 : :
3608 [ + - + - ]: 1 : if (connOptions.m_use_addrman_outgoing && !connOptions.m_specified_outgoing.empty()) {
3609 [ # # ]: 0 : if (m_client_interface) {
3610 [ # # ]: 0 : m_client_interface->ThreadSafeMessageBox(
3611 [ # # ]: 0 : _("Cannot provide specific connections and have addrman find outgoing connections at the same time."),
3612 : : CClientUIInterface::MSG_ERROR);
3613 : : }
3614 : 0 : return false;
3615 : : }
3616 [ - + - - ]: 1 : if (connOptions.m_use_addrman_outgoing || !connOptions.m_specified_outgoing.empty()) {
3617 : 1 : threadOpenConnections = std::thread(
3618 [ + - ]: 1 : &util::TraceThread, "opencon",
3619 [ + - + - : 4 : [this, connect = connOptions.m_specified_outgoing, seed_nodes = std::move(seed_nodes)] { ThreadOpenConnections(connect, seed_nodes); });
- + + - ]
3620 : : }
3621 : :
3622 : : // Process messages
3623 [ + - ]: 2 : threadMessageHandler = std::thread(&util::TraceThread, "msghand", [this] { ThreadMessageHandler(); });
3624 : :
3625 [ - + ]: 1 : if (m_i2p_sam_session) {
3626 : 0 : threadI2PAcceptIncoming =
3627 [ # # ]: 0 : std::thread(&util::TraceThread, "i2paccept", [this] { ThreadI2PAcceptIncoming(); });
3628 : : }
3629 : :
3630 [ + - + - : 1 : if (gArgs.GetBoolArg("-privatebroadcast", DEFAULT_PRIVATE_BROADCAST)) {
- + ]
3631 : 0 : threadPrivateBroadcast =
3632 [ # # ]: 0 : std::thread(&util::TraceThread, "privbcast", [this] { ThreadPrivateBroadcast(); });
3633 : : }
3634 : :
3635 : : // Dump network addresses
3636 [ + - ]: 1 : scheduler.scheduleEvery([this] { DumpAddresses(); }, DUMP_PEERS_INTERVAL);
3637 : :
3638 : : // Run the ASMap Health check once and then schedule it to run every 24h.
3639 [ + - - + ]: 1 : if (m_netgroupman.UsingASMap()) {
3640 [ # # ]: 0 : ASMapHealthCheck();
3641 [ # # ]: 0 : scheduler.scheduleEvery([this] { ASMapHealthCheck(); }, ASMAP_HEALTH_CHECK_INTERVAL);
3642 : : }
3643 : :
3644 : : return true;
3645 : 1 : }
3646 : :
3647 : : class CNetCleanup
3648 : : {
3649 : : public:
3650 : : CNetCleanup() = default;
3651 : :
3652 : : ~CNetCleanup()
3653 : : {
3654 : : #ifdef WIN32
3655 : : // Shutdown Windows Sockets
3656 : : WSACleanup();
3657 : : #endif
3658 : : }
3659 : : };
3660 : : static CNetCleanup instance_of_cnetcleanup;
3661 : :
3662 : 160 : void CConnman::Interrupt()
3663 : : {
3664 : 160 : {
3665 : 160 : LOCK(mutexMsgProc);
3666 [ + - ]: 160 : flagInterruptMsgProc = true;
3667 : 160 : }
3668 : 160 : condMsgProc.notify_all();
3669 : :
3670 : 160 : (*m_interrupt_net)();
3671 : 160 : g_socks5_interrupt();
3672 : :
3673 [ + + ]: 160 : if (semOutbound) {
3674 [ + + ]: 12 : for (int i=0; i<m_max_automatic_outbound; i++) {
3675 : 11 : semOutbound->release();
3676 : : }
3677 : : }
3678 : :
3679 [ + + ]: 160 : if (semAddnode) {
3680 [ + + ]: 9 : for (int i=0; i<m_max_addnode; i++) {
3681 : 8 : semAddnode->release();
3682 : : }
3683 : : }
3684 : :
3685 : 160 : m_private_broadcast.m_sem_conn_max.release();
3686 : 160 : m_private_broadcast.NumToOpenAdd(1); // Just unblock NumToOpenWait() to be able to continue with shutdown.
3687 : 160 : }
3688 : :
3689 : 160 : void CConnman::StopThreads()
3690 : : {
3691 [ - + ]: 160 : if (threadPrivateBroadcast.joinable()) {
3692 : 0 : threadPrivateBroadcast.join();
3693 : : }
3694 [ - + ]: 160 : if (threadI2PAcceptIncoming.joinable()) {
3695 : 0 : threadI2PAcceptIncoming.join();
3696 : : }
3697 [ + + ]: 160 : if (threadMessageHandler.joinable())
3698 : 1 : threadMessageHandler.join();
3699 [ + + ]: 160 : if (threadOpenConnections.joinable())
3700 : 1 : threadOpenConnections.join();
3701 [ + + ]: 160 : if (threadOpenAddedConnections.joinable())
3702 : 1 : threadOpenAddedConnections.join();
3703 [ - + ]: 160 : if (threadDNSAddressSeed.joinable())
3704 : 0 : threadDNSAddressSeed.join();
3705 [ + + ]: 160 : if (threadSocketHandler.joinable())
3706 : 1 : threadSocketHandler.join();
3707 : 160 : }
3708 : :
3709 : 160 : void CConnman::StopNodes()
3710 : : {
3711 : 160 : AssertLockNotHeld(m_nodes_mutex);
3712 : 160 : AssertLockNotHeld(m_reconnections_mutex);
3713 : :
3714 [ + + ]: 160 : if (fAddressesInitialized) {
3715 : 1 : DumpAddresses();
3716 : 1 : fAddressesInitialized = false;
3717 : :
3718 [ + - ]: 1 : if (m_use_addrman_outgoing) {
3719 : : // Anchor connections are only dumped during clean shutdown.
3720 : 1 : std::vector<CAddress> anchors_to_dump = GetCurrentBlockRelayOnlyConns();
3721 [ - + - + ]: 1 : if (anchors_to_dump.size() > MAX_BLOCK_RELAY_ONLY_ANCHORS) {
3722 [ # # ]: 0 : anchors_to_dump.resize(MAX_BLOCK_RELAY_ONLY_ANCHORS);
3723 : : }
3724 [ + - + - ]: 3 : DumpAnchors(gArgs.GetDataDirNet() / ANCHORS_DATABASE_FILENAME, anchors_to_dump);
3725 : 1 : }
3726 : : }
3727 : :
3728 : : // Delete peer connections.
3729 : 160 : std::vector<CNode*> nodes;
3730 [ + - + - ]: 320 : WITH_LOCK(m_nodes_mutex, nodes.swap(m_nodes));
3731 [ - + ]: 160 : for (CNode* pnode : nodes) {
3732 [ # # # # : 0 : LogDebug(BCLog::NET, "Stopping node, %s", pnode->DisconnectMsg());
# # # # ]
3733 [ # # ]: 0 : pnode->CloseSocketDisconnect();
3734 [ # # ]: 0 : DeleteNode(pnode);
3735 : : }
3736 : :
3737 [ - + ]: 160 : for (CNode* pnode : m_nodes_disconnected) {
3738 [ # # ]: 0 : DeleteNode(pnode);
3739 : : }
3740 : 160 : m_nodes_disconnected.clear();
3741 [ + - + - ]: 320 : WITH_LOCK(m_reconnections_mutex, m_reconnections.clear());
3742 : 160 : vhListenSocket.clear();
3743 [ + + ]: 160 : semOutbound.reset();
3744 [ + + ]: 161 : semAddnode.reset();
3745 : 160 : }
3746 : :
3747 : 0 : void CConnman::DeleteNode(CNode* pnode)
3748 : : {
3749 [ # # ]: 0 : assert(pnode);
3750 : 0 : m_msgproc->FinalizeNode(*pnode);
3751 : 0 : delete pnode;
3752 : 0 : }
3753 : :
3754 [ + - ]: 159 : CConnman::~CConnman()
3755 : : {
3756 : 159 : Interrupt();
3757 : 159 : Stop();
3758 : 318 : }
3759 : :
3760 : 0 : std::vector<CAddress> CConnman::GetAddressesUnsafe(size_t max_addresses, size_t max_pct, std::optional<Network> network, const bool filtered) const
3761 : : {
3762 : 0 : std::vector<CAddress> addresses = addrman.get().GetAddr(max_addresses, max_pct, network, filtered);
3763 [ # # ]: 0 : if (m_banman) {
3764 [ # # ]: 0 : addresses.erase(std::remove_if(addresses.begin(), addresses.end(),
3765 [ # # # # ]: 0 : [this](const CAddress& addr){return m_banman->IsDiscouraged(addr) || m_banman->IsBanned(addr);}),
3766 [ # # ]: 0 : addresses.end());
3767 : : }
3768 : 0 : return addresses;
3769 : 0 : }
3770 : :
3771 : 0 : std::vector<CAddress> CConnman::GetAddresses(CNode& requestor, size_t max_addresses, size_t max_pct)
3772 : : {
3773 : 0 : uint64_t network_id = requestor.m_network_key;
3774 : 0 : const auto current_time = GetTime<std::chrono::microseconds>();
3775 [ # # ]: 0 : auto r = m_addr_response_caches.emplace(network_id, CachedAddrResponse{});
3776 [ # # ]: 0 : CachedAddrResponse& cache_entry = r.first->second;
3777 [ # # ]: 0 : if (cache_entry.m_cache_entry_expiration < current_time) { // If emplace() added new one it has expiration 0.
3778 : 0 : cache_entry.m_addrs_response_cache = GetAddressesUnsafe(max_addresses, max_pct, /*network=*/std::nullopt);
3779 : : // Choosing a proper cache lifetime is a trade-off between the privacy leak minimization
3780 : : // and the usefulness of ADDR responses to honest users.
3781 : : //
3782 : : // Longer cache lifetime makes it more difficult for an attacker to scrape
3783 : : // enough AddrMan data to maliciously infer something useful.
3784 : : // By the time an attacker scraped enough AddrMan records, most of
3785 : : // the records should be old enough to not leak topology info by
3786 : : // e.g. analyzing real-time changes in timestamps.
3787 : : //
3788 : : // It takes only several hundred requests to scrape everything from an AddrMan containing 100,000 nodes,
3789 : : // so ~24 hours of cache lifetime indeed makes the data less inferable by the time
3790 : : // most of it could be scraped (considering that timestamps are updated via
3791 : : // ADDR self-announcements and when nodes communicate).
3792 : : // We also should be robust to those attacks which may not require scraping *full* victim's AddrMan
3793 : : // (because even several timestamps of the same handful of nodes may leak privacy).
3794 : : //
3795 : : // On the other hand, longer cache lifetime makes ADDR responses
3796 : : // outdated and less useful for an honest requestor, e.g. if most nodes
3797 : : // in the ADDR response are no longer active.
3798 : : //
3799 : : // However, the churn in the network is known to be rather low. Since we consider
3800 : : // nodes to be "terrible" (see IsTerrible()) if the timestamps are older than 30 days,
3801 : : // max. 24 hours of "penalty" due to cache shouldn't make any meaningful difference
3802 : : // in terms of the freshness of the response.
3803 : 0 : cache_entry.m_cache_entry_expiration = current_time +
3804 : 0 : 21h + FastRandomContext().randrange<std::chrono::microseconds>(6h);
3805 : : }
3806 : 0 : return cache_entry.m_addrs_response_cache;
3807 : : }
3808 : :
3809 : 7 : bool CConnman::AddNode(const AddedNodeParams& add)
3810 : : {
3811 [ + - + - ]: 7 : const CService resolved(LookupNumeric(add.m_added_node, GetDefaultPort(add.m_added_node)));
3812 [ + - ]: 7 : const bool resolved_is_valid{resolved.IsValid()};
3813 : :
3814 [ + - ]: 7 : LOCK(m_added_nodes_mutex);
3815 [ + + ]: 17 : for (const auto& it : m_added_node_params) {
3816 [ + - + - : 36 : 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;
+ - + - +
- + - + +
+ - + + -
- - - ]
3817 : : }
3818 : :
3819 [ + - ]: 5 : m_added_node_params.push_back(add);
3820 : : return true;
3821 : 7 : }
3822 : :
3823 : 0 : bool CConnman::RemoveAddedNode(std::string_view node)
3824 : : {
3825 : 0 : LOCK(m_added_nodes_mutex);
3826 [ # # ]: 0 : for (auto it = m_added_node_params.begin(); it != m_added_node_params.end(); ++it) {
3827 [ # # # # ]: 0 : if (node == it->m_added_node) {
3828 : 0 : m_added_node_params.erase(it);
3829 : 0 : return true;
3830 : : }
3831 : : }
3832 : : return false;
3833 : 0 : }
3834 : :
3835 : 6 : bool CConnman::AddedNodesContain(const CAddress& addr) const
3836 : : {
3837 : 6 : AssertLockNotHeld(m_added_nodes_mutex);
3838 : 6 : const std::string addr_str{addr.ToStringAddr()};
3839 [ + - ]: 6 : const std::string addr_port_str{addr.ToStringAddrPort()};
3840 [ + - ]: 6 : LOCK(m_added_nodes_mutex);
3841 [ - + ]: 6 : return (m_added_node_params.size() < 24 // bound the query to a reasonable limit
3842 [ + - + + ]: 6 : && std::any_of(m_added_node_params.cbegin(), m_added_node_params.cend(),
3843 [ + - + + : 26 : [&](const auto& p) { return p.m_added_node == addr_str || p.m_added_node == addr_port_str; }));
+ - ]
3844 : 6 : }
3845 : :
3846 : 9 : size_t CConnman::GetNodeCount(ConnectionDirection flags) const
3847 : : {
3848 : 9 : LOCK(m_nodes_mutex);
3849 [ + + ]: 9 : if (flags == ConnectionDirection::Both) // Shortcut if we want total
3850 [ - + ]: 3 : return m_nodes.size();
3851 : :
3852 : 6 : int nNum = 0;
3853 [ - + ]: 6 : for (const auto& pnode : m_nodes) {
3854 [ # # # # ]: 0 : if (flags & (pnode->IsInboundConn() ? ConnectionDirection::In : ConnectionDirection::Out)) {
3855 : 0 : nNum++;
3856 : : }
3857 : : }
3858 : :
3859 : 6 : return nNum;
3860 : 9 : }
3861 : :
3862 : :
3863 : 0 : std::map<CNetAddr, LocalServiceInfo> CConnman::getNetLocalAddresses() const
3864 : : {
3865 : 0 : LOCK(g_maplocalhost_mutex);
3866 [ # # # # ]: 0 : return mapLocalHost;
3867 : 0 : }
3868 : :
3869 : 4 : uint32_t CConnman::GetMappedAS(const CNetAddr& addr) const
3870 : : {
3871 : 4 : return m_netgroupman.GetMappedAS(addr);
3872 : : }
3873 : :
3874 : 0 : void CConnman::GetNodeStats(std::vector<CNodeStats>& vstats) const
3875 : : {
3876 : 0 : AssertLockNotHeld(m_nodes_mutex);
3877 : :
3878 : 0 : vstats.clear();
3879 : 0 : LOCK(m_nodes_mutex);
3880 [ # # # # ]: 0 : vstats.reserve(m_nodes.size());
3881 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
3882 [ # # ]: 0 : vstats.emplace_back();
3883 [ # # ]: 0 : pnode->CopyStats(vstats.back());
3884 [ # # ]: 0 : vstats.back().m_mapped_as = GetMappedAS(pnode->addr);
3885 : : }
3886 : 0 : }
3887 : :
3888 : 0 : bool CConnman::DisconnectNode(std::string_view strNode)
3889 : : {
3890 : 0 : LOCK(m_nodes_mutex);
3891 [ # # ]: 0 : auto it = std::ranges::find_if(m_nodes, [&strNode](CNode* node) { return node->m_addr_name == strNode; });
3892 [ # # ]: 0 : if (it != m_nodes.end()) {
3893 : 0 : CNode* node{*it};
3894 [ # # # # : 0 : LogDebug(BCLog::NET, "disconnect by address%s match, %s", (fLogIPs ? strprintf("=%s", strNode) : ""), node->DisconnectMsg());
# # # # #
# # # #
# ]
3895 : 0 : node->fDisconnect = true;
3896 : 0 : return true;
3897 : : }
3898 : : return false;
3899 : 0 : }
3900 : :
3901 : 11 : bool CConnman::DisconnectNode(const CSubNet& subnet)
3902 : : {
3903 : 11 : AssertLockNotHeld(m_nodes_mutex);
3904 : 11 : bool disconnected = false;
3905 : 11 : LOCK(m_nodes_mutex);
3906 [ + + ]: 17 : for (CNode* pnode : m_nodes) {
3907 [ + - + + ]: 6 : if (subnet.Match(pnode->addr)) {
3908 [ + - + - : 6 : LogDebug(BCLog::NET, "disconnect by subnet%s match, %s", (fLogIPs ? strprintf("=%s", subnet.ToString()) : ""), pnode->DisconnectMsg());
+ - - + -
- - - + -
+ - - + -
- ]
3909 : 3 : pnode->fDisconnect = true;
3910 : 3 : disconnected = true;
3911 : : }
3912 : : }
3913 [ + - ]: 11 : return disconnected;
3914 : 11 : }
3915 : :
3916 : 6 : bool CConnman::DisconnectNode(const CNetAddr& addr)
3917 : : {
3918 : 6 : AssertLockNotHeld(m_nodes_mutex);
3919 [ + - ]: 6 : return DisconnectNode(CSubNet(addr));
3920 : : }
3921 : :
3922 : 0 : bool CConnman::DisconnectNode(NodeId id)
3923 : : {
3924 : 0 : LOCK(m_nodes_mutex);
3925 [ # # ]: 0 : for(CNode* pnode : m_nodes) {
3926 [ # # ]: 0 : if (id == pnode->GetId()) {
3927 [ # # # # : 0 : LogDebug(BCLog::NET, "disconnect by id, %s", pnode->DisconnectMsg());
# # # # ]
3928 : 0 : pnode->fDisconnect = true;
3929 : 0 : return true;
3930 : : }
3931 : : }
3932 : : return false;
3933 : 0 : }
3934 : :
3935 : 0 : void CConnman::RecordBytesRecv(uint64_t bytes)
3936 : : {
3937 : 0 : nTotalBytesRecv += bytes;
3938 : 0 : }
3939 : :
3940 : 0 : void CConnman::RecordBytesSent(uint64_t bytes)
3941 : : {
3942 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3943 : 0 : LOCK(m_total_bytes_sent_mutex);
3944 : :
3945 : 0 : nTotalBytesSent += bytes;
3946 : :
3947 : 0 : const auto now = GetTime<std::chrono::seconds>();
3948 [ # # ]: 0 : if (nMaxOutboundCycleStartTime + MAX_UPLOAD_TIMEFRAME < now)
3949 : : {
3950 : : // timeframe expired, reset cycle
3951 : 0 : nMaxOutboundCycleStartTime = now;
3952 : 0 : nMaxOutboundTotalBytesSentInCycle = 0;
3953 : : }
3954 : :
3955 [ # # ]: 0 : nMaxOutboundTotalBytesSentInCycle += bytes;
3956 : 0 : }
3957 : :
3958 : 0 : uint64_t CConnman::GetMaxOutboundTarget() const
3959 : : {
3960 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3961 : 0 : LOCK(m_total_bytes_sent_mutex);
3962 [ # # ]: 0 : return nMaxOutboundLimit;
3963 : 0 : }
3964 : :
3965 : 0 : std::chrono::seconds CConnman::GetMaxOutboundTimeframe() const
3966 : : {
3967 : 0 : return MAX_UPLOAD_TIMEFRAME;
3968 : : }
3969 : :
3970 : 0 : std::chrono::seconds CConnman::GetMaxOutboundTimeLeftInCycle() const
3971 : : {
3972 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3973 : 0 : LOCK(m_total_bytes_sent_mutex);
3974 [ # # ]: 0 : return GetMaxOutboundTimeLeftInCycle_();
3975 : 0 : }
3976 : :
3977 : 0 : std::chrono::seconds CConnman::GetMaxOutboundTimeLeftInCycle_() const
3978 : : {
3979 : 0 : AssertLockHeld(m_total_bytes_sent_mutex);
3980 : :
3981 [ # # ]: 0 : if (nMaxOutboundLimit == 0)
3982 : 0 : return 0s;
3983 : :
3984 [ # # ]: 0 : if (nMaxOutboundCycleStartTime.count() == 0)
3985 : 0 : return MAX_UPLOAD_TIMEFRAME;
3986 : :
3987 : 0 : const std::chrono::seconds cycleEndTime = nMaxOutboundCycleStartTime + MAX_UPLOAD_TIMEFRAME;
3988 : 0 : const auto now = GetTime<std::chrono::seconds>();
3989 [ # # ]: 0 : return (cycleEndTime < now) ? 0s : cycleEndTime - now;
3990 : : }
3991 : :
3992 : 0 : bool CConnman::OutboundTargetReached(bool historicalBlockServingLimit) const
3993 : : {
3994 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3995 : 0 : LOCK(m_total_bytes_sent_mutex);
3996 [ # # ]: 0 : if (nMaxOutboundLimit == 0)
3997 : : return false;
3998 : :
3999 [ # # ]: 0 : if (historicalBlockServingLimit)
4000 : : {
4001 : : // keep a large enough buffer to at least relay each block once
4002 [ # # ]: 0 : const std::chrono::seconds timeLeftInCycle = GetMaxOutboundTimeLeftInCycle_();
4003 : 0 : const uint64_t buffer = timeLeftInCycle / std::chrono::minutes{10} * MAX_BLOCK_SERIALIZED_SIZE;
4004 [ # # # # ]: 0 : if (buffer >= nMaxOutboundLimit || nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit - buffer)
4005 : 0 : return true;
4006 : : }
4007 [ # # ]: 0 : else if (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit)
4008 : 0 : return true;
4009 : :
4010 : : return false;
4011 : 0 : }
4012 : :
4013 : 0 : uint64_t CConnman::GetOutboundTargetBytesLeft() const
4014 : : {
4015 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
4016 : 0 : LOCK(m_total_bytes_sent_mutex);
4017 [ # # ]: 0 : if (nMaxOutboundLimit == 0)
4018 : : return 0;
4019 : :
4020 [ # # ]: 0 : return (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit) ? 0 : nMaxOutboundLimit - nMaxOutboundTotalBytesSentInCycle;
4021 : 0 : }
4022 : :
4023 : 0 : uint64_t CConnman::GetTotalBytesRecv() const
4024 : : {
4025 : 0 : return nTotalBytesRecv;
4026 : : }
4027 : :
4028 : 0 : uint64_t CConnman::GetTotalBytesSent() const
4029 : : {
4030 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
4031 : 0 : LOCK(m_total_bytes_sent_mutex);
4032 [ # # ]: 0 : return nTotalBytesSent;
4033 : 0 : }
4034 : :
4035 : 318 : ServiceFlags CConnman::GetLocalServices() const
4036 : : {
4037 : 318 : return m_local_services;
4038 : : }
4039 : :
4040 : 41 : static std::unique_ptr<Transport> MakeTransport(NodeId id, bool use_v2transport, bool inbound) noexcept
4041 : : {
4042 [ - + ]: 41 : if (use_v2transport) {
4043 [ # # ]: 0 : return std::make_unique<V2Transport>(id, /*initiating=*/!inbound);
4044 : : } else {
4045 [ - + ]: 41 : return std::make_unique<V1Transport>(id);
4046 : : }
4047 : : }
4048 : :
4049 : 41 : CNode::CNode(NodeId idIn,
4050 : : std::shared_ptr<Sock> sock,
4051 : : const CAddress& addrIn,
4052 : : uint64_t nKeyedNetGroupIn,
4053 : : uint64_t nLocalHostNonceIn,
4054 : : const CService& addrBindIn,
4055 : : const std::string& addrNameIn,
4056 : : ConnectionType conn_type_in,
4057 : : bool inbound_onion,
4058 : : uint64_t network_key,
4059 : 41 : CNodeOptions&& node_opts)
4060 : 41 : : m_transport{MakeTransport(idIn, node_opts.use_v2transport, conn_type_in == ConnectionType::INBOUND)},
4061 : 41 : m_permission_flags{node_opts.permission_flags},
4062 [ - + ]: 41 : m_sock{sock},
4063 : 41 : m_connected{NodeClock::now()},
4064 [ - - ]: 41 : m_proxy_override{std::move(node_opts.proxy_override)},
4065 : 41 : addr{addrIn},
4066 : 41 : addrBind{addrBindIn},
4067 [ + - + - ]: 41 : m_addr_name{addrNameIn.empty() ? addr.ToStringAddrPort() : addrNameIn},
4068 [ - + ]: 41 : m_dest(addrNameIn),
4069 : 41 : m_inbound_onion{inbound_onion},
4070 [ + - ]: 41 : m_prefer_evict{node_opts.prefer_evict},
4071 : 41 : nKeyedNetGroup{nKeyedNetGroupIn},
4072 : 41 : m_network_key{network_key},
4073 : 41 : m_conn_type{conn_type_in},
4074 : 41 : id{idIn},
4075 : 41 : nLocalHostNonce{nLocalHostNonceIn},
4076 [ + - ]: 41 : m_recv_flood_size{node_opts.recv_flood_size},
4077 [ + - + - : 82 : m_i2p_sam_session{std::move(node_opts.i2p_sam_session)}
+ + ]
4078 : : {
4079 [ + + + - ]: 41 : if (inbound_onion) assert(conn_type_in == ConnectionType::INBOUND);
4080 : :
4081 [ + + ]: 1476 : for (const auto& msg : ALL_NET_MESSAGE_TYPES) {
4082 [ + - ]: 1435 : mapRecvBytesPerMsgType[msg] = 0;
4083 : : }
4084 [ + - ]: 41 : mapRecvBytesPerMsgType[NET_MESSAGE_TYPE_OTHER] = 0;
4085 : :
4086 [ + + ]: 41 : if (fLogIPs) {
4087 [ + - + - : 6 : LogDebug(BCLog::NET, "Added connection to %s peer=%d\n", m_addr_name, id);
+ - ]
4088 : : } else {
4089 [ + - + - : 35 : LogDebug(BCLog::NET, "Added connection peer=%d\n", id);
+ - ]
4090 : : }
4091 [ - - ]: 41 : }
4092 : :
4093 : 5 : void CNode::MarkReceivedMsgsForProcessing()
4094 : : {
4095 : 5 : AssertLockNotHeld(m_msg_process_queue_mutex);
4096 : :
4097 : 5 : size_t nSizeAdded = 0;
4098 [ + + ]: 10 : for (const auto& msg : vRecvMsg) {
4099 : : // vRecvMsg contains only completed CNetMessage
4100 : : // the single possible partially deserialized message are held by TransportDeserializer
4101 : 5 : nSizeAdded += msg.GetMemoryUsage();
4102 : : }
4103 : :
4104 : 5 : LOCK(m_msg_process_queue_mutex);
4105 : 5 : m_msg_process_queue.splice(m_msg_process_queue.end(), vRecvMsg);
4106 : 5 : m_msg_process_queue_size += nSizeAdded;
4107 [ + - ]: 5 : fPauseRecv = m_msg_process_queue_size > m_recv_flood_size;
4108 : 5 : }
4109 : :
4110 : 5 : std::optional<std::pair<CNetMessage, bool>> CNode::PollMessage()
4111 : : {
4112 : 5 : LOCK(m_msg_process_queue_mutex);
4113 [ - + ]: 5 : if (m_msg_process_queue.empty()) return std::nullopt;
4114 : :
4115 : 5 : std::list<CNetMessage> msgs;
4116 : : // Just take one message
4117 : 5 : msgs.splice(msgs.begin(), m_msg_process_queue, m_msg_process_queue.begin());
4118 : 5 : m_msg_process_queue_size -= msgs.front().GetMemoryUsage();
4119 : 5 : fPauseRecv = m_msg_process_queue_size > m_recv_flood_size;
4120 : :
4121 : 10 : return std::make_pair(std::move(msgs.front()), !m_msg_process_queue.empty());
4122 : 5 : }
4123 : :
4124 : 55 : bool CConnman::NodeFullyConnected(const CNode* pnode)
4125 : : {
4126 [ + - + - : 55 : return pnode && pnode->fSuccessfullyConnected && !pnode->fDisconnect;
+ + ]
4127 : : }
4128 : :
4129 : : /// Private broadcast connections only need to send certain message types.
4130 : : /// Other messages are not needed and may degrade privacy.
4131 : 1 : static bool IsOutboundMessageAllowedInPrivateBroadcast(std::string_view type) noexcept
4132 : : {
4133 : 1 : return type == NetMsgType::VERSION ||
4134 [ # # ]: 0 : type == NetMsgType::VERACK ||
4135 [ # # ]: 0 : type == NetMsgType::INV ||
4136 [ - + - - ]: 1 : type == NetMsgType::TX ||
4137 [ # # ]: 0 : type == NetMsgType::PING;
4138 : : }
4139 : :
4140 : 23 : void CConnman::PushMessage(CNode* pnode, CSerializedNetMsg&& msg)
4141 : : {
4142 : 23 : AssertLockNotHeld(m_total_bytes_sent_mutex);
4143 : :
4144 [ + + - + : 23 : if (pnode->IsPrivateBroadcastConn() && !IsOutboundMessageAllowedInPrivateBroadcast(msg.m_type)) {
- + ]
4145 [ # # # # ]: 0 : LogDebug(BCLog::PRIVBROADCAST, "Omitting send of message '%s', %s", msg.m_type, pnode->LogPeer());
4146 : 0 : return;
4147 : : }
4148 : :
4149 [ + - + + : 23 : if (!m_private_broadcast.m_outbound_tor_ok_at_least_once.load() && !pnode->IsInboundConn() &&
- + ]
4150 [ + - - + : 44 : pnode->addr.IsTor() && msg.m_type == NetMsgType::VERACK) {
- - ]
4151 : : // If we are sending the peer VERACK that means we successfully sent
4152 : : // and received another message to/from that peer (VERSION).
4153 : 0 : m_private_broadcast.m_outbound_tor_ok_at_least_once.store(true);
4154 : : }
4155 : :
4156 [ - + ]: 23 : size_t nMessageSize = msg.data.size();
4157 [ + - ]: 23 : LogDebug(BCLog::NET, "sending %s (%d bytes) peer=%d\n", msg.m_type, nMessageSize, pnode->GetId());
4158 [ + + ]: 23 : if (m_capture_messages) {
4159 [ - + ]: 10 : CaptureMessage(pnode->addr, msg.m_type, msg.data, /*is_incoming=*/false);
4160 : : }
4161 : :
4162 : : TRACEPOINT(net, outbound_message,
4163 : : pnode->GetId(),
4164 : : pnode->m_addr_name.c_str(),
4165 : : pnode->ConnectionTypeAsString().c_str(),
4166 : : msg.m_type.c_str(),
4167 : : msg.data.size(),
4168 : : msg.data.data()
4169 : 23 : );
4170 : :
4171 : 23 : size_t nBytesSent = 0;
4172 : 23 : {
4173 : 23 : LOCK(pnode->cs_vSend);
4174 : : // Check if the transport still has unsent bytes, and indicate to it that we're about to
4175 : : // give it a message to send.
4176 [ + + ]: 23 : const auto& [to_send, more, _msg_type] =
4177 [ + + ]: 23 : pnode->m_transport->GetBytesToSend(/*have_next_message=*/true);
4178 [ + + - + ]: 23 : const bool queue_was_empty{to_send.empty() && pnode->vSendMsg.empty()};
4179 : :
4180 : : // Update memory usage of send buffer.
4181 : 23 : pnode->m_send_memusage += msg.GetMemoryUsage();
4182 [ + - ]: 23 : if (pnode->m_send_memusage + pnode->m_transport->GetSendMemoryUsage() > nSendBufferMaxSize) pnode->fPauseSend = true;
4183 : : // Move message to vSendMsg queue.
4184 [ + - ]: 23 : pnode->vSendMsg.push_back(std::move(msg));
4185 : :
4186 : : // If there was nothing to send before, and there is now (predicted by the "more" value
4187 : : // returned by the GetBytesToSend call above), attempt "optimistic write":
4188 : : // because the poll/select loop may pause for SELECT_TIMEOUT_MILLISECONDS before actually
4189 : : // doing a send, try sending from the calling thread if the queue was empty before.
4190 : : // With a V1Transport, more will always be true here, because adding a message always
4191 : : // results in sendable bytes there, but with V2Transport this is not the case (it may
4192 : : // still be in the handshake).
4193 [ + + + - ]: 23 : if (queue_was_empty && more) {
4194 [ + - ]: 9 : std::tie(nBytesSent, std::ignore) = SocketSendData(*pnode);
4195 : : }
4196 : 23 : }
4197 [ - + ]: 23 : if (nBytesSent) RecordBytesSent(nBytesSent);
4198 : : }
4199 : :
4200 : 7 : bool CConnman::ForNode(NodeId id, std::function<bool(CNode* pnode)> func)
4201 : : {
4202 : 7 : AssertLockNotHeld(m_nodes_mutex);
4203 : :
4204 : 7 : CNode* found = nullptr;
4205 : 7 : LOCK(m_nodes_mutex);
4206 [ + - ]: 44 : for (auto&& pnode : m_nodes) {
4207 [ + + ]: 44 : if(pnode->GetId() == id) {
4208 : : found = pnode;
4209 : : break;
4210 : : }
4211 : : }
4212 [ + - + - : 8 : return found != nullptr && NodeFullyConnected(found) && func(found);
+ - + - +
+ + - ]
4213 : 7 : }
4214 : :
4215 : 0 : CSipHasher CConnman::GetDeterministicRandomizer(uint64_t id) const
4216 : : {
4217 : 0 : return CSipHasher(nSeed0, nSeed1).Write(id);
4218 : : }
4219 : :
4220 : 0 : uint64_t CConnman::CalculateKeyedNetGroup(const CNetAddr& address) const
4221 : : {
4222 : 0 : std::vector<unsigned char> vchNetGroup(m_netgroupman.GetGroup(address));
4223 : :
4224 [ # # # # : 0 : return GetDeterministicRandomizer(RANDOMIZER_ID_NETGROUP).Write(vchNetGroup).Finalize();
# # ]
4225 : 0 : }
4226 : :
4227 : 1 : void CConnman::PerformReconnections()
4228 : : {
4229 : 1 : AssertLockNotHeld(m_nodes_mutex);
4230 : 1 : AssertLockNotHeld(m_reconnections_mutex);
4231 : 1 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
4232 : 1 : while (true) {
4233 : : // Move first element of m_reconnections to todo (avoiding an allocation inside the lock).
4234 [ + - ]: 1 : decltype(m_reconnections) todo;
4235 : 1 : {
4236 [ + - ]: 1 : LOCK(m_reconnections_mutex);
4237 [ - + ]: 1 : if (m_reconnections.empty()) break;
4238 [ # # ]: 0 : todo.splice(todo.end(), m_reconnections, m_reconnections.begin());
4239 : 1 : }
4240 : :
4241 [ # # ]: 0 : auto& item = *todo.begin();
4242 : 0 : OpenNetworkConnection(item.addr_connect,
4243 : : // We only reconnect if the first attempt to connect succeeded at
4244 : : // connection time, but then failed after the CNode object was
4245 : : // created. Since we already know connecting is possible, do not
4246 : : // count failure to reconnect.
4247 : : /*fCountFailure=*/false,
4248 [ # # ]: 0 : std::move(item.grant),
4249 : 0 : item.destination.empty() ? nullptr : item.destination.c_str(),
4250 : : item.conn_type,
4251 : 0 : item.use_v2transport,
4252 [ # # ]: 0 : item.proxy_override);
4253 : 0 : }
4254 : 1 : }
4255 : :
4256 : 0 : void CConnman::ASMapHealthCheck()
4257 : : {
4258 : 0 : const std::vector<CAddress> v4_addrs{GetAddressesUnsafe(/*max_addresses=*/0, /*max_pct=*/0, Network::NET_IPV4, /*filtered=*/false)};
4259 [ # # ]: 0 : const std::vector<CAddress> v6_addrs{GetAddressesUnsafe(/*max_addresses=*/0, /*max_pct=*/0, Network::NET_IPV6, /*filtered=*/false)};
4260 : 0 : std::vector<CNetAddr> clearnet_addrs;
4261 [ # # # # : 0 : clearnet_addrs.reserve(v4_addrs.size() + v6_addrs.size());
# # ]
4262 [ # # ]: 0 : std::transform(v4_addrs.begin(), v4_addrs.end(), std::back_inserter(clearnet_addrs),
4263 [ # # ]: 0 : [](const CAddress& addr) { return static_cast<CNetAddr>(addr); });
4264 [ # # ]: 0 : std::transform(v6_addrs.begin(), v6_addrs.end(), std::back_inserter(clearnet_addrs),
4265 [ # # # # ]: 0 : [](const CAddress& addr) { return static_cast<CNetAddr>(addr); });
4266 [ # # ]: 0 : m_netgroupman.ASMapHealthCheck(clearnet_addrs);
4267 : 0 : }
4268 : :
4269 : : // Dump binary message to file, with timestamp.
4270 : 6 : static void CaptureMessageToFile(const CAddress& addr,
4271 : : const std::string& msg_type,
4272 : : std::span<const unsigned char> data,
4273 : : bool is_incoming)
4274 : : {
4275 : : // Note: This function captures the message at the time of processing,
4276 : : // not at socket receive/send time.
4277 : : // This ensures that the messages are always in order from an application
4278 : : // layer (processing) perspective.
4279 : 6 : auto now = GetTime<std::chrono::microseconds>();
4280 : :
4281 : : // Windows folder names cannot include a colon
4282 : 6 : std::string clean_addr = addr.ToStringAddrPort();
4283 [ - + ]: 6 : std::replace(clean_addr.begin(), clean_addr.end(), ':', '_');
4284 : :
4285 [ - + + - : 30 : fs::path base_path = gArgs.GetDataDirNet() / "message_capture" / fs::u8path(clean_addr);
+ - + - ]
4286 [ + - ]: 6 : fs::create_directories(base_path);
4287 : :
4288 [ + - + - ]: 18 : fs::path path = base_path / (is_incoming ? "msgs_recv.dat" : "msgs_sent.dat");
4289 [ + - + - ]: 12 : AutoFile f{fsbridge::fopen(path, "ab")};
4290 : :
4291 [ + - ]: 6 : ser_writedata64(f, now.count());
4292 [ - + + - ]: 6 : f << std::span{msg_type};
4293 [ - + + + ]: 29 : for (auto i = msg_type.length(); i < CMessageHeader::MESSAGE_TYPE_SIZE; ++i) {
4294 [ + - ]: 46 : f << uint8_t{'\0'};
4295 : : }
4296 [ + - ]: 6 : uint32_t size = data.size();
4297 [ + - ]: 6 : ser_writedata32(f, size);
4298 [ + - ]: 6 : f << data;
4299 : :
4300 [ + - - + ]: 12 : if (f.fclose() != 0) {
4301 : 0 : throw std::ios_base::failure(
4302 [ # # # # : 0 : strprintf("Error closing %s after write, file contents are likely incomplete", fs::PathToString(path)));
# # ]
4303 : : }
4304 : 18 : }
4305 : :
4306 : : std::function<void(const CAddress& addr,
4307 : : const std::string& msg_type,
4308 : : std::span<const unsigned char> data,
4309 : : bool is_incoming)>
4310 : : CaptureMessage = CaptureMessageToFile;
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