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1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-2022 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 : : #ifdef WIN32
41 : : #include <string.h>
42 : : #endif
43 : :
44 : : #if HAVE_DECL_GETIFADDRS && HAVE_DECL_FREEIFADDRS
45 : : #include <ifaddrs.h>
46 : : #endif
47 : :
48 : : #include <algorithm>
49 : : #include <array>
50 : : #include <cmath>
51 : : #include <cstdint>
52 : : #include <functional>
53 : : #include <optional>
54 : : #include <unordered_map>
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_ADDRCACHE = 0x1cf2e4ddd306dda9ULL; // SHA256("addrcache")[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 : 0 : size_t CSerializedNetMsg::GetMemoryUsage() const noexcept
123 : : {
124 : : // Don't count the dynamic memory used for the m_type string, by assuming it fits in the
125 : : // "small string" optimization area (which stores data inside the object itself, up to some
126 : : // size; 15 bytes in modern libstdc++).
127 [ # # ]: 0 : return sizeof(*this) + memusage::DynamicUsage(data);
128 : : }
129 : :
130 : 0 : void CConnman::AddAddrFetch(const std::string& strDest)
131 : : {
132 : 0 : LOCK(m_addr_fetches_mutex);
133 [ # # ]: 0 : m_addr_fetches.push_back(strDest);
134 : 0 : }
135 : :
136 : 0 : uint16_t GetListenPort()
137 : : {
138 : : // If -bind= is provided with ":port" part, use that (first one if multiple are provided).
139 [ # # # # ]: 0 : for (const std::string& bind_arg : gArgs.GetArgs("-bind")) {
140 : 0 : constexpr uint16_t dummy_port = 0;
141 : :
142 [ # # # # ]: 0 : const std::optional<CService> bind_addr{Lookup(bind_arg, dummy_port, /*fAllowLookup=*/false)};
143 [ # # # # : 0 : if (bind_addr.has_value() && bind_addr->GetPort() != dummy_port) return bind_addr->GetPort();
# # # # ]
144 : 0 : }
145 : :
146 : : // Otherwise, if -whitebind= without NetPermissionFlags::NoBan is provided, use that
147 : : // (-whitebind= is required to have ":port").
148 [ # # # # ]: 0 : for (const std::string& whitebind_arg : gArgs.GetArgs("-whitebind")) {
149 [ # # ]: 0 : NetWhitebindPermissions whitebind;
150 [ # # ]: 0 : bilingual_str error;
151 [ # # # # ]: 0 : if (NetWhitebindPermissions::TryParse(whitebind_arg, whitebind, error)) {
152 [ # # ]: 0 : if (!NetPermissions::HasFlag(whitebind.m_flags, NetPermissionFlags::NoBan)) {
153 [ # # ]: 0 : return whitebind.m_service.GetPort();
154 : : }
155 : : }
156 : 0 : }
157 : :
158 : : // Otherwise, if -port= is provided, use that. Otherwise use the default port.
159 [ # # ]: 0 : return static_cast<uint16_t>(gArgs.GetIntArg("-port", Params().GetDefaultPort()));
160 : : }
161 : :
162 : : // Determine the "best" local address for a particular peer.
163 : 0 : [[nodiscard]] static std::optional<CService> GetLocal(const CNode& peer)
164 : : {
165 [ # # ]: 0 : if (!fListen) return std::nullopt;
166 : :
167 : 0 : std::optional<CService> addr;
168 : 0 : int nBestScore = -1;
169 : 0 : int nBestReachability = -1;
170 : 0 : {
171 [ # # ]: 0 : LOCK(g_maplocalhost_mutex);
172 [ # # # # ]: 0 : for (const auto& [local_addr, local_service_info] : mapLocalHost) {
173 : : // For privacy reasons, don't advertise our privacy-network address
174 : : // to other networks and don't advertise our other-network address
175 : : // to privacy networks.
176 [ # # # # ]: 0 : if (local_addr.GetNetwork() != peer.ConnectedThroughNetwork()
177 [ # # # # : 0 : && (local_addr.IsPrivacyNet() || peer.IsConnectedThroughPrivacyNet())) {
# # ]
178 : 0 : continue;
179 : : }
180 : 0 : const int nScore{local_service_info.nScore};
181 [ # # ]: 0 : const int nReachability{local_addr.GetReachabilityFrom(peer.addr)};
182 [ # # # # ]: 0 : if (nReachability > nBestReachability || (nReachability == nBestReachability && nScore > nBestScore)) {
183 [ # # ]: 0 : addr.emplace(CService{local_addr, local_service_info.nPort});
184 : 0 : nBestReachability = nReachability;
185 : 0 : nBestScore = nScore;
186 : : }
187 : : }
188 : 0 : }
189 [ # # ]: 0 : return addr;
190 : 0 : }
191 : :
192 : : //! Convert the serialized seeds into usable address objects.
193 : 0 : static std::vector<CAddress> ConvertSeeds(const std::vector<uint8_t> &vSeedsIn)
194 : : {
195 : : // It'll only connect to one or two seed nodes because once it connects,
196 : : // it'll get a pile of addresses with newer timestamps.
197 : : // Seed nodes are given a random 'last seen time' of between one and two
198 : : // weeks ago.
199 : 0 : const auto one_week{7 * 24h};
200 : 0 : std::vector<CAddress> vSeedsOut;
201 : 0 : FastRandomContext rng;
202 [ # # ]: 0 : ParamsStream s{DataStream{vSeedsIn}, CAddress::V2_NETWORK};
203 [ # # ]: 0 : while (!s.eof()) {
204 [ # # ]: 0 : CService endpoint;
205 [ # # ]: 0 : s >> endpoint;
206 : 0 : CAddress addr{endpoint, SeedsServiceFlags()};
207 : 0 : addr.nTime = rng.rand_uniform_delay(Now<NodeSeconds>() - one_week, -one_week);
208 [ # # # # : 0 : LogDebug(BCLog::NET, "Added hardcoded seed: %s\n", addr.ToStringAddrPort());
# # # # ]
209 [ # # ]: 0 : vSeedsOut.push_back(addr);
210 : 0 : }
211 : 0 : return vSeedsOut;
212 : 0 : }
213 : :
214 : : // Determine the "best" local address for a particular peer.
215 : : // If none, return the unroutable 0.0.0.0 but filled in with
216 : : // the normal parameters, since the IP may be changed to a useful
217 : : // one by discovery.
218 : 0 : CService GetLocalAddress(const CNode& peer)
219 : : {
220 [ # # # # : 0 : return GetLocal(peer).value_or(CService{CNetAddr(), GetListenPort()});
# # ]
221 : : }
222 : :
223 : 0 : static int GetnScore(const CService& addr)
224 : : {
225 : 0 : LOCK(g_maplocalhost_mutex);
226 [ # # ]: 0 : const auto it = mapLocalHost.find(addr);
227 [ # # # # ]: 0 : return (it != mapLocalHost.end()) ? it->second.nScore : 0;
228 : 0 : }
229 : :
230 : : // Is our peer's addrLocal potentially useful as an external IP source?
231 : 0 : [[nodiscard]] static bool IsPeerAddrLocalGood(CNode *pnode)
232 : : {
233 : 0 : CService addrLocal = pnode->GetAddrLocal();
234 [ # # # # : 0 : return fDiscover && pnode->addr.IsRoutable() && addrLocal.IsRoutable() &&
# # # # #
# # # ]
235 [ # # ]: 0 : g_reachable_nets.Contains(addrLocal);
236 : 0 : }
237 : :
238 : 0 : std::optional<CService> GetLocalAddrForPeer(CNode& node)
239 : : {
240 : 0 : CService addrLocal{GetLocalAddress(node)};
241 : : // If discovery is enabled, sometimes give our peer the address it
242 : : // tells us that it sees us as in case it has a better idea of our
243 : : // address than we do.
244 : 0 : FastRandomContext rng;
245 [ # # # # : 0 : if (IsPeerAddrLocalGood(&node) && (!addrLocal.IsRoutable() ||
# # # # #
# ]
246 [ # # # # ]: 0 : rng.randbits((GetnScore(addrLocal) > LOCAL_MANUAL) ? 3 : 1) == 0))
247 : : {
248 [ # # ]: 0 : if (node.IsInboundConn()) {
249 : : // For inbound connections, assume both the address and the port
250 : : // as seen from the peer.
251 [ # # ]: 0 : addrLocal = CService{node.GetAddrLocal()};
252 : : } else {
253 : : // For outbound connections, assume just the address as seen from
254 : : // the peer and leave the port in `addrLocal` as returned by
255 : : // `GetLocalAddress()` above. The peer has no way to observe our
256 : : // listening port when we have initiated the connection.
257 [ # # # # ]: 0 : addrLocal.SetIP(node.GetAddrLocal());
258 : : }
259 : : }
260 [ # # # # ]: 0 : if (addrLocal.IsRoutable()) {
261 [ # # # # : 0 : LogDebug(BCLog::NET, "Advertising address %s to peer=%d\n", addrLocal.ToStringAddrPort(), node.GetId());
# # # # ]
262 : 0 : return addrLocal;
263 : : }
264 : : // Address is unroutable. Don't advertise.
265 : 0 : return std::nullopt;
266 : 0 : }
267 : :
268 : : // learn a new local address
269 : 0 : bool AddLocal(const CService& addr_, int nScore)
270 : : {
271 : 0 : CService addr{MaybeFlipIPv6toCJDNS(addr_)};
272 : :
273 [ # # # # ]: 0 : if (!addr.IsRoutable())
274 : : return false;
275 : :
276 [ # # # # ]: 0 : if (!fDiscover && nScore < LOCAL_MANUAL)
277 : : return false;
278 : :
279 [ # # # # ]: 0 : if (!g_reachable_nets.Contains(addr))
280 : : return false;
281 : :
282 [ # # # # ]: 0 : LogPrintf("AddLocal(%s,%i)\n", addr.ToStringAddrPort(), nScore);
283 : :
284 : 0 : {
285 [ # # ]: 0 : LOCK(g_maplocalhost_mutex);
286 [ # # # # ]: 0 : const auto [it, is_newly_added] = mapLocalHost.emplace(addr, LocalServiceInfo());
287 [ # # ]: 0 : LocalServiceInfo &info = it->second;
288 [ # # # # ]: 0 : if (is_newly_added || nScore >= info.nScore) {
289 [ # # ]: 0 : info.nScore = nScore + (is_newly_added ? 0 : 1);
290 [ # # ]: 0 : info.nPort = addr.GetPort();
291 : : }
292 : 0 : }
293 : :
294 : 0 : return true;
295 : 0 : }
296 : :
297 : 0 : bool AddLocal(const CNetAddr &addr, int nScore)
298 : : {
299 [ # # ]: 0 : return AddLocal(CService(addr, GetListenPort()), nScore);
300 : : }
301 : :
302 : 0 : void RemoveLocal(const CService& addr)
303 : : {
304 : 0 : LOCK(g_maplocalhost_mutex);
305 [ # # # # ]: 0 : LogPrintf("RemoveLocal(%s)\n", addr.ToStringAddrPort());
306 [ # # # # ]: 0 : mapLocalHost.erase(addr);
307 : 0 : }
308 : :
309 : : /** vote for a local address */
310 : 0 : bool SeenLocal(const CService& addr)
311 : : {
312 : 0 : LOCK(g_maplocalhost_mutex);
313 [ # # ]: 0 : const auto it = mapLocalHost.find(addr);
314 [ # # ]: 0 : if (it == mapLocalHost.end()) return false;
315 : 0 : ++it->second.nScore;
316 : 0 : return true;
317 : 0 : }
318 : :
319 : :
320 : : /** check whether a given address is potentially local */
321 : 0 : bool IsLocal(const CService& addr)
322 : : {
323 : 0 : LOCK(g_maplocalhost_mutex);
324 [ # # # # ]: 0 : return mapLocalHost.count(addr) > 0;
325 : 0 : }
326 : :
327 : 0 : CNode* CConnman::FindNode(const CNetAddr& ip)
328 : : {
329 : 0 : LOCK(m_nodes_mutex);
330 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
331 [ # # # # ]: 0 : if (static_cast<CNetAddr>(pnode->addr) == ip) {
332 : : return pnode;
333 : : }
334 : : }
335 : : return nullptr;
336 : 0 : }
337 : :
338 : 0 : CNode* CConnman::FindNode(const std::string& addrName)
339 : : {
340 : 0 : LOCK(m_nodes_mutex);
341 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
342 [ # # ]: 0 : if (pnode->m_addr_name == addrName) {
343 : : return pnode;
344 : : }
345 : : }
346 : : return nullptr;
347 : 0 : }
348 : :
349 : 0 : CNode* CConnman::FindNode(const CService& addr)
350 : : {
351 : 0 : LOCK(m_nodes_mutex);
352 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
353 [ # # # # ]: 0 : if (static_cast<CService>(pnode->addr) == addr) {
354 : : return pnode;
355 : : }
356 : : }
357 : : return nullptr;
358 : 0 : }
359 : :
360 : 0 : bool CConnman::AlreadyConnectedToAddress(const CAddress& addr)
361 : : {
362 [ # # # # : 0 : return FindNode(static_cast<CNetAddr>(addr)) || FindNode(addr.ToStringAddrPort());
# # # # #
# ]
363 : : }
364 : :
365 : 0 : bool CConnman::CheckIncomingNonce(uint64_t nonce)
366 : : {
367 : 0 : LOCK(m_nodes_mutex);
368 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
369 [ # # # # : 0 : if (!pnode->fSuccessfullyConnected && !pnode->IsInboundConn() && pnode->GetLocalNonce() == nonce)
# # ]
370 : : return false;
371 : : }
372 : : return true;
373 : 0 : }
374 : :
375 : : /** Get the bind address for a socket as CAddress */
376 : 0 : static CAddress GetBindAddress(const Sock& sock)
377 : : {
378 : 0 : CAddress addr_bind;
379 : 0 : struct sockaddr_storage sockaddr_bind;
380 : 0 : socklen_t sockaddr_bind_len = sizeof(sockaddr_bind);
381 [ # # # # ]: 0 : if (!sock.GetSockName((struct sockaddr*)&sockaddr_bind, &sockaddr_bind_len)) {
382 [ # # ]: 0 : addr_bind.SetSockAddr((const struct sockaddr*)&sockaddr_bind);
383 : : } else {
384 [ # # # # : 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Warning, "getsockname failed\n");
# # ]
385 : : }
386 : 0 : return addr_bind;
387 : 0 : }
388 : :
389 : 0 : CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure, ConnectionType conn_type, bool use_v2transport)
390 : : {
391 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
392 [ # # ]: 0 : assert(conn_type != ConnectionType::INBOUND);
393 : :
394 [ # # ]: 0 : if (pszDest == nullptr) {
395 [ # # ]: 0 : if (IsLocal(addrConnect))
396 : : return nullptr;
397 : :
398 : : // Look for an existing connection
399 [ # # ]: 0 : CNode* pnode = FindNode(static_cast<CService>(addrConnect));
400 [ # # ]: 0 : if (pnode)
401 : : {
402 : 0 : LogPrintf("Failed to open new connection, already connected\n");
403 : 0 : return nullptr;
404 : : }
405 : : }
406 : :
407 [ # # # # : 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Debug, "trying %s connection %s lastseen=%.1fhrs\n",
# # # # #
# ]
408 : : use_v2transport ? "v2" : "v1",
409 : : pszDest ? pszDest : addrConnect.ToStringAddrPort(),
410 : : Ticks<HoursDouble>(pszDest ? 0h : Now<NodeSeconds>() - addrConnect.nTime));
411 : :
412 : : // Resolve
413 [ # # # # ]: 0 : const uint16_t default_port{pszDest != nullptr ? GetDefaultPort(pszDest) :
414 : 0 : m_params.GetDefaultPort()};
415 : :
416 : : // Collection of addresses to try to connect to: either all dns resolved addresses if a domain name (pszDest) is provided, or addrConnect otherwise.
417 : 0 : std::vector<CAddress> connect_to{};
418 [ # # ]: 0 : if (pszDest) {
419 [ # # # # : 0 : std::vector<CService> resolved{Lookup(pszDest, default_port, fNameLookup && !HaveNameProxy(), 256)};
# # # # #
# # # ]
420 [ # # ]: 0 : if (!resolved.empty()) {
421 : 0 : std::shuffle(resolved.begin(), resolved.end(), FastRandomContext());
422 : : // If the connection is made by name, it can be the case that the name resolves to more than one address.
423 : : // We don't want to connect any more of them if we are already connected to one
424 [ # # ]: 0 : for (const auto& r : resolved) {
425 [ # # ]: 0 : addrConnect = CAddress{MaybeFlipIPv6toCJDNS(r), NODE_NONE};
426 [ # # # # ]: 0 : if (!addrConnect.IsValid()) {
427 [ # # # # : 0 : LogDebug(BCLog::NET, "Resolver returned invalid address %s for %s\n", addrConnect.ToStringAddrPort(), pszDest);
# # # # ]
428 : 0 : return nullptr;
429 : : }
430 : : // It is possible that we already have a connection to the IP/port pszDest resolved to.
431 : : // In that case, drop the connection that was just created.
432 [ # # ]: 0 : LOCK(m_nodes_mutex);
433 [ # # ]: 0 : CNode* pnode = FindNode(static_cast<CService>(addrConnect));
434 [ # # ]: 0 : if (pnode) {
435 [ # # # # ]: 0 : LogPrintf("Not opening a connection to %s, already connected to %s\n", pszDest, addrConnect.ToStringAddrPort());
436 [ # # ]: 0 : return nullptr;
437 : : }
438 : : // Add the address to the resolved addresses vector so we can try to connect to it later on
439 [ # # ]: 0 : connect_to.push_back(addrConnect);
440 : 0 : }
441 : : } else {
442 : : // For resolution via proxy
443 [ # # ]: 0 : connect_to.push_back(addrConnect);
444 : : }
445 : 0 : } else {
446 : : // Connect via addrConnect directly
447 [ # # ]: 0 : connect_to.push_back(addrConnect);
448 : : }
449 : :
450 : : // Connect
451 : 0 : std::unique_ptr<Sock> sock;
452 [ # # ]: 0 : Proxy proxy;
453 [ # # ]: 0 : CAddress addr_bind;
454 [ # # # # ]: 0 : assert(!addr_bind.IsValid());
455 : 0 : std::unique_ptr<i2p::sam::Session> i2p_transient_session;
456 : :
457 [ # # ]: 0 : for (auto& target_addr: connect_to) {
458 [ # # # # ]: 0 : if (target_addr.IsValid()) {
459 [ # # # # ]: 0 : const bool use_proxy{GetProxy(target_addr.GetNetwork(), proxy)};
460 : 0 : bool proxyConnectionFailed = false;
461 : :
462 [ # # # # ]: 0 : if (target_addr.IsI2P() && use_proxy) {
463 [ # # ]: 0 : i2p::Connection conn;
464 : 0 : bool connected{false};
465 : :
466 [ # # ]: 0 : if (m_i2p_sam_session) {
467 [ # # ]: 0 : connected = m_i2p_sam_session->Connect(target_addr, conn, proxyConnectionFailed);
468 : : } else {
469 : 0 : {
470 [ # # ]: 0 : LOCK(m_unused_i2p_sessions_mutex);
471 [ # # ]: 0 : if (m_unused_i2p_sessions.empty()) {
472 : 0 : i2p_transient_session =
473 [ # # ]: 0 : std::make_unique<i2p::sam::Session>(proxy, &interruptNet);
474 : : } else {
475 : 0 : i2p_transient_session.swap(m_unused_i2p_sessions.front());
476 : 0 : m_unused_i2p_sessions.pop();
477 : : }
478 : 0 : }
479 [ # # ]: 0 : connected = i2p_transient_session->Connect(target_addr, conn, proxyConnectionFailed);
480 [ # # ]: 0 : if (!connected) {
481 [ # # ]: 0 : LOCK(m_unused_i2p_sessions_mutex);
482 [ # # ]: 0 : if (m_unused_i2p_sessions.size() < MAX_UNUSED_I2P_SESSIONS_SIZE) {
483 [ # # # # ]: 0 : m_unused_i2p_sessions.emplace(i2p_transient_session.release());
484 : : }
485 : 0 : }
486 : : }
487 : :
488 [ # # ]: 0 : if (connected) {
489 : 0 : sock = std::move(conn.sock);
490 : 0 : addr_bind = CAddress{conn.me, NODE_NONE};
491 : : }
492 [ # # ]: 0 : } else if (use_proxy) {
493 [ # # # # : 0 : LogPrintLevel(BCLog::PROXY, BCLog::Level::Debug, "Using proxy: %s to connect to %s\n", proxy.ToString(), target_addr.ToStringAddrPort());
# # # # #
# ]
494 [ # # # # : 0 : sock = ConnectThroughProxy(proxy, target_addr.ToStringAddr(), target_addr.GetPort(), proxyConnectionFailed);
# # ]
495 : : } else {
496 : : // no proxy needed (none set for target network)
497 [ # # ]: 0 : sock = ConnectDirectly(target_addr, conn_type == ConnectionType::MANUAL);
498 : : }
499 [ # # ]: 0 : if (!proxyConnectionFailed) {
500 : : // If a connection to the node was attempted, and failure (if any) is not caused by a problem connecting to
501 : : // the proxy, mark this as an attempt.
502 [ # # ]: 0 : addrman.Attempt(target_addr, fCountFailure);
503 : : }
504 [ # # # # : 0 : } else if (pszDest && GetNameProxy(proxy)) {
# # ]
505 [ # # ]: 0 : std::string host;
506 : 0 : uint16_t port{default_port};
507 [ # # # # ]: 0 : SplitHostPort(std::string(pszDest), port, host);
508 : 0 : bool proxyConnectionFailed;
509 [ # # ]: 0 : sock = ConnectThroughProxy(proxy, host, port, proxyConnectionFailed);
510 : 0 : }
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 : CNode* pnode = new CNode(id,
527 : : std::move(sock),
528 : : target_addr,
529 : : CalculateKeyedNetGroup(target_addr),
530 : : nonce,
531 : : addr_bind,
532 : 0 : pszDest ? pszDest : "",
533 : : conn_type,
534 : : /*inbound_onion=*/false,
535 [ # # ]: 0 : CNodeOptions{
536 : : .permission_flags = permission_flags,
537 : : .i2p_sam_session = std::move(i2p_transient_session),
538 [ # # ]: 0 : .recv_flood_size = nReceiveFloodSize,
539 : : .use_v2transport = use_v2transport,
540 [ # # # # : 0 : });
# # # # #
# # # #
# ]
541 : 0 : pnode->AddRef();
542 : :
543 : : // We're making a new connection, harvest entropy from the time (and our peer count)
544 : 0 : RandAddEvent((uint32_t)id);
545 : :
546 : 0 : return pnode;
547 : 0 : }
548 : :
549 : : return nullptr;
550 : 0 : }
551 : :
552 : 0 : void CNode::CloseSocketDisconnect()
553 : : {
554 : 0 : fDisconnect = true;
555 : 0 : LOCK(m_sock_mutex);
556 [ # # ]: 0 : if (m_sock) {
557 [ # # # # : 0 : LogDebug(BCLog::NET, "disconnecting peer=%d\n", id);
# # ]
558 : 0 : m_sock.reset();
559 : : }
560 [ # # # # ]: 0 : m_i2p_sam_session.reset();
561 : 0 : }
562 : :
563 : 0 : void CConnman::AddWhitelistPermissionFlags(NetPermissionFlags& flags, const CNetAddr &addr, const std::vector<NetWhitelistPermissions>& ranges) const {
564 [ # # ]: 0 : for (const auto& subnet : ranges) {
565 [ # # ]: 0 : if (subnet.m_subnet.Match(addr)) {
566 : 0 : NetPermissions::AddFlag(flags, subnet.m_flags);
567 : : }
568 : : }
569 [ # # ]: 0 : if (NetPermissions::HasFlag(flags, NetPermissionFlags::Implicit)) {
570 [ # # ]: 0 : NetPermissions::ClearFlag(flags, NetPermissionFlags::Implicit);
571 [ # # ]: 0 : if (whitelist_forcerelay) NetPermissions::AddFlag(flags, NetPermissionFlags::ForceRelay);
572 [ # # ]: 0 : if (whitelist_relay) NetPermissions::AddFlag(flags, NetPermissionFlags::Relay);
573 : 0 : NetPermissions::AddFlag(flags, NetPermissionFlags::Mempool);
574 : 0 : NetPermissions::AddFlag(flags, NetPermissionFlags::NoBan);
575 : : }
576 : 0 : }
577 : :
578 : 0 : CService CNode::GetAddrLocal() const
579 : : {
580 : 0 : AssertLockNotHeld(m_addr_local_mutex);
581 : 0 : LOCK(m_addr_local_mutex);
582 [ # # ]: 0 : return m_addr_local;
583 : 0 : }
584 : :
585 : 0 : void CNode::SetAddrLocal(const CService& addrLocalIn) {
586 : 0 : AssertLockNotHeld(m_addr_local_mutex);
587 : 0 : LOCK(m_addr_local_mutex);
588 [ # # # # : 0 : if (Assume(!m_addr_local.IsValid())) { // Addr local can only be set once during version msg processing
# # ]
589 : 0 : m_addr_local = addrLocalIn;
590 : : }
591 : 0 : }
592 : :
593 : 0 : Network CNode::ConnectedThroughNetwork() const
594 : : {
595 [ # # ]: 0 : return m_inbound_onion ? NET_ONION : addr.GetNetClass();
596 : : }
597 : :
598 : 0 : bool CNode::IsConnectedThroughPrivacyNet() const
599 : : {
600 [ # # # # ]: 0 : return m_inbound_onion || addr.IsPrivacyNet();
601 : : }
602 : :
603 : : #undef X
604 : : #define X(name) stats.name = name
605 : 0 : void CNode::CopyStats(CNodeStats& stats)
606 : : {
607 : 0 : stats.nodeid = this->GetId();
608 : 0 : X(addr);
609 : 0 : X(addrBind);
610 : 0 : stats.m_network = ConnectedThroughNetwork();
611 : 0 : X(m_last_send);
612 : 0 : X(m_last_recv);
613 : 0 : X(m_last_tx_time);
614 : 0 : X(m_last_block_time);
615 : 0 : X(m_connected);
616 : 0 : X(m_addr_name);
617 : 0 : X(nVersion);
618 : 0 : {
619 : 0 : LOCK(m_subver_mutex);
620 [ # # # # ]: 0 : X(cleanSubVer);
621 : 0 : }
622 : 0 : stats.fInbound = IsInboundConn();
623 : 0 : X(m_bip152_highbandwidth_to);
624 : 0 : X(m_bip152_highbandwidth_from);
625 : 0 : {
626 : 0 : LOCK(cs_vSend);
627 [ # # ]: 0 : X(mapSendBytesPerMsgType);
628 [ # # ]: 0 : X(nSendBytes);
629 : 0 : }
630 : 0 : {
631 : 0 : LOCK(cs_vRecv);
632 [ # # ]: 0 : X(mapRecvBytesPerMsgType);
633 : 0 : X(nRecvBytes);
634 : 0 : Transport::Info info = m_transport->GetInfo();
635 : 0 : stats.m_transport_type = info.transport_type;
636 [ # # # # ]: 0 : if (info.session_id) stats.m_session_id = HexStr(*info.session_id);
637 : 0 : }
638 : 0 : X(m_permission_flags);
639 : :
640 : 0 : X(m_last_ping_time);
641 : 0 : X(m_min_ping_time);
642 : :
643 : : // Leave string empty if addrLocal invalid (not filled in yet)
644 : 0 : CService addrLocalUnlocked = GetAddrLocal();
645 [ # # # # : 0 : stats.addrLocal = addrLocalUnlocked.IsValid() ? addrLocalUnlocked.ToStringAddrPort() : "";
# # # # ]
646 : :
647 : 0 : X(m_conn_type);
648 : 0 : }
649 : : #undef X
650 : :
651 : 0 : bool CNode::ReceiveMsgBytes(Span<const uint8_t> msg_bytes, bool& complete)
652 : : {
653 : 0 : complete = false;
654 : 0 : const auto time = GetTime<std::chrono::microseconds>();
655 : 0 : LOCK(cs_vRecv);
656 : 0 : m_last_recv = std::chrono::duration_cast<std::chrono::seconds>(time);
657 : 0 : nRecvBytes += msg_bytes.size();
658 [ # # ]: 0 : while (msg_bytes.size() > 0) {
659 : : // absorb network data
660 [ # # # # ]: 0 : if (!m_transport->ReceivedBytes(msg_bytes)) {
661 : : // Serious transport problem, disconnect from the peer.
662 : : return false;
663 : : }
664 : :
665 [ # # # # ]: 0 : if (m_transport->ReceivedMessageComplete()) {
666 : : // decompose a transport agnostic CNetMessage from the deserializer
667 : 0 : bool reject_message{false};
668 [ # # ]: 0 : CNetMessage msg = m_transport->GetReceivedMessage(time, reject_message);
669 [ # # ]: 0 : if (reject_message) {
670 : : // Message deserialization failed. Drop the message but don't disconnect the peer.
671 : : // store the size of the corrupt message
672 [ # # ]: 0 : mapRecvBytesPerMsgType.at(NET_MESSAGE_TYPE_OTHER) += msg.m_raw_message_size;
673 : 0 : continue;
674 : : }
675 : :
676 : : // Store received bytes per message type.
677 : : // To prevent a memory DOS, only allow known message types.
678 : 0 : auto i = mapRecvBytesPerMsgType.find(msg.m_type);
679 [ # # ]: 0 : if (i == mapRecvBytesPerMsgType.end()) {
680 : 0 : i = mapRecvBytesPerMsgType.find(NET_MESSAGE_TYPE_OTHER);
681 : : }
682 [ # # ]: 0 : assert(i != mapRecvBytesPerMsgType.end());
683 [ # # ]: 0 : i->second += msg.m_raw_message_size;
684 : :
685 : : // push the message to the process queue,
686 [ # # ]: 0 : vRecvMsg.push_back(std::move(msg));
687 : :
688 : 0 : complete = true;
689 : 0 : }
690 : : }
691 : :
692 : : return true;
693 : 0 : }
694 : :
695 : 0 : V1Transport::V1Transport(const NodeId node_id) noexcept
696 : 0 : : m_magic_bytes{Params().MessageStart()}, m_node_id{node_id}
697 : : {
698 : 0 : LOCK(m_recv_mutex);
699 [ # # ]: 0 : Reset();
700 : 0 : }
701 : :
702 : 0 : Transport::Info V1Transport::GetInfo() const noexcept
703 : : {
704 : 0 : return {.transport_type = TransportProtocolType::V1, .session_id = {}};
705 : : }
706 : :
707 : 0 : int V1Transport::readHeader(Span<const uint8_t> msg_bytes)
708 : : {
709 : 0 : AssertLockHeld(m_recv_mutex);
710 : : // copy data to temporary parsing buffer
711 : 0 : unsigned int nRemaining = CMessageHeader::HEADER_SIZE - nHdrPos;
712 [ # # ]: 0 : unsigned int nCopy = std::min<unsigned int>(nRemaining, msg_bytes.size());
713 : :
714 [ # # ]: 0 : memcpy(&hdrbuf[nHdrPos], msg_bytes.data(), nCopy);
715 : 0 : nHdrPos += nCopy;
716 : :
717 : : // if header incomplete, exit
718 [ # # ]: 0 : if (nHdrPos < CMessageHeader::HEADER_SIZE)
719 : 0 : return nCopy;
720 : :
721 : : // deserialize to CMessageHeader
722 : 0 : try {
723 [ # # ]: 0 : hdrbuf >> hdr;
724 : : }
725 [ - - ]: 0 : catch (const std::exception&) {
726 [ - - - - : 0 : LogDebug(BCLog::NET, "Header error: Unable to deserialize, peer=%d\n", m_node_id);
- - ]
727 : 0 : return -1;
728 : 0 : }
729 : :
730 : : // Check start string, network magic
731 [ # # ]: 0 : if (hdr.pchMessageStart != m_magic_bytes) {
732 [ # # # # ]: 0 : LogDebug(BCLog::NET, "Header error: Wrong MessageStart %s received, peer=%d\n", HexStr(hdr.pchMessageStart), m_node_id);
733 : 0 : return -1;
734 : : }
735 : :
736 : : // reject messages larger than MAX_SIZE or MAX_PROTOCOL_MESSAGE_LENGTH
737 [ # # ]: 0 : if (hdr.nMessageSize > MAX_SIZE || hdr.nMessageSize > MAX_PROTOCOL_MESSAGE_LENGTH) {
738 [ # # # # : 0 : LogDebug(BCLog::NET, "Header error: Size too large (%s, %u bytes), peer=%d\n", SanitizeString(hdr.GetCommand()), hdr.nMessageSize, m_node_id);
# # ]
739 : 0 : return -1;
740 : : }
741 : :
742 : : // switch state to reading message data
743 : 0 : in_data = true;
744 : :
745 : 0 : return nCopy;
746 : : }
747 : :
748 : 0 : int V1Transport::readData(Span<const uint8_t> msg_bytes)
749 : : {
750 : 0 : AssertLockHeld(m_recv_mutex);
751 : 0 : unsigned int nRemaining = hdr.nMessageSize - nDataPos;
752 [ # # ]: 0 : unsigned int nCopy = std::min<unsigned int>(nRemaining, msg_bytes.size());
753 : :
754 [ # # ]: 0 : if (vRecv.size() < nDataPos + nCopy) {
755 : : // Allocate up to 256 KiB ahead, but never more than the total message size.
756 [ # # ]: 0 : vRecv.resize(std::min(hdr.nMessageSize, nDataPos + nCopy + 256 * 1024));
757 : : }
758 : :
759 : 0 : hasher.Write(msg_bytes.first(nCopy));
760 : 0 : memcpy(&vRecv[nDataPos], msg_bytes.data(), nCopy);
761 : 0 : nDataPos += nCopy;
762 : :
763 : 0 : return nCopy;
764 : : }
765 : :
766 : 0 : const uint256& V1Transport::GetMessageHash() const
767 : : {
768 : 0 : AssertLockHeld(m_recv_mutex);
769 [ # # # # ]: 0 : assert(CompleteInternal());
770 [ # # ]: 0 : if (data_hash.IsNull())
771 : 0 : hasher.Finalize(data_hash);
772 : 0 : return data_hash;
773 : : }
774 : :
775 : 0 : CNetMessage V1Transport::GetReceivedMessage(const std::chrono::microseconds time, bool& reject_message)
776 : : {
777 : 0 : AssertLockNotHeld(m_recv_mutex);
778 : : // Initialize out parameter
779 : 0 : reject_message = false;
780 : : // decompose a single CNetMessage from the TransportDeserializer
781 : 0 : LOCK(m_recv_mutex);
782 [ # # ]: 0 : CNetMessage msg(std::move(vRecv));
783 : :
784 : : // store message type string, time, and sizes
785 [ # # ]: 0 : msg.m_type = hdr.GetCommand();
786 : 0 : msg.m_time = time;
787 : 0 : msg.m_message_size = hdr.nMessageSize;
788 : 0 : msg.m_raw_message_size = hdr.nMessageSize + CMessageHeader::HEADER_SIZE;
789 : :
790 [ # # ]: 0 : uint256 hash = GetMessageHash();
791 : :
792 : : // We just received a message off the wire, harvest entropy from the time (and the message checksum)
793 : 0 : RandAddEvent(ReadLE32(hash.begin()));
794 : :
795 : : // Check checksum and header message type string
796 [ # # ]: 0 : if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) {
797 [ # # # # : 0 : LogDebug(BCLog::NET, "Header error: Wrong checksum (%s, %u bytes), expected %s was %s, peer=%d\n",
# # # # #
# # # ]
798 : : SanitizeString(msg.m_type), msg.m_message_size,
799 : : HexStr(Span{hash}.first(CMessageHeader::CHECKSUM_SIZE)),
800 : : HexStr(hdr.pchChecksum),
801 : : m_node_id);
802 : 0 : reject_message = true;
803 [ # # # # ]: 0 : } else if (!hdr.IsCommandValid()) {
804 [ # # # # : 0 : LogDebug(BCLog::NET, "Header error: Invalid message type (%s, %u bytes), peer=%d\n",
# # # # #
# ]
805 : : SanitizeString(hdr.GetCommand()), msg.m_message_size, m_node_id);
806 : 0 : reject_message = true;
807 : : }
808 : :
809 : : // Always reset the network deserializer (prepare for the next message)
810 [ # # ]: 0 : Reset();
811 [ # # ]: 0 : return msg;
812 : 0 : }
813 : :
814 : 0 : bool V1Transport::SetMessageToSend(CSerializedNetMsg& msg) noexcept
815 : : {
816 : 0 : AssertLockNotHeld(m_send_mutex);
817 : : // Determine whether a new message can be set.
818 : 0 : LOCK(m_send_mutex);
819 [ # # # # ]: 0 : if (m_sending_header || m_bytes_sent < m_message_to_send.data.size()) return false;
820 : :
821 : : // create dbl-sha256 checksum
822 : 0 : uint256 hash = Hash(msg.data);
823 : :
824 : : // create header
825 : 0 : CMessageHeader hdr(m_magic_bytes, msg.m_type.c_str(), msg.data.size());
826 [ # # ]: 0 : memcpy(hdr.pchChecksum, hash.begin(), CMessageHeader::CHECKSUM_SIZE);
827 : :
828 : : // serialize header
829 [ # # ]: 0 : m_header_to_send.clear();
830 : 0 : VectorWriter{m_header_to_send, 0, hdr};
831 : :
832 : : // update state
833 : 0 : m_message_to_send = std::move(msg);
834 : 0 : m_sending_header = true;
835 : 0 : m_bytes_sent = 0;
836 : 0 : return true;
837 : 0 : }
838 : :
839 : 0 : Transport::BytesToSend V1Transport::GetBytesToSend(bool have_next_message) const noexcept
840 : : {
841 : 0 : AssertLockNotHeld(m_send_mutex);
842 : 0 : LOCK(m_send_mutex);
843 [ # # ]: 0 : if (m_sending_header) {
844 [ # # ]: 0 : return {Span{m_header_to_send}.subspan(m_bytes_sent),
845 : : // We have more to send after the header if the message has payload, or if there
846 : : // is a next message after that.
847 [ # # # # ]: 0 : have_next_message || !m_message_to_send.data.empty(),
848 : 0 : m_message_to_send.m_type
849 : 0 : };
850 : : } else {
851 : 0 : return {Span{m_message_to_send.data}.subspan(m_bytes_sent),
852 : : // We only have more to send after this message's payload if there is another
853 : : // message.
854 : : have_next_message,
855 : 0 : m_message_to_send.m_type
856 : 0 : };
857 : : }
858 : 0 : }
859 : :
860 : 0 : void V1Transport::MarkBytesSent(size_t bytes_sent) noexcept
861 : : {
862 : 0 : AssertLockNotHeld(m_send_mutex);
863 : 0 : LOCK(m_send_mutex);
864 : 0 : m_bytes_sent += bytes_sent;
865 [ # # # # ]: 0 : if (m_sending_header && m_bytes_sent == m_header_to_send.size()) {
866 : : // We're done sending a message's header. Switch to sending its data bytes.
867 : 0 : m_sending_header = false;
868 : 0 : m_bytes_sent = 0;
869 [ # # # # ]: 0 : } else if (!m_sending_header && m_bytes_sent == m_message_to_send.data.size()) {
870 : : // We're done sending a message's data. Wipe the data vector to reduce memory consumption.
871 : 0 : ClearShrink(m_message_to_send.data);
872 : 0 : m_bytes_sent = 0;
873 : : }
874 : 0 : }
875 : :
876 : 0 : size_t V1Transport::GetSendMemoryUsage() const noexcept
877 : : {
878 : 0 : AssertLockNotHeld(m_send_mutex);
879 : 0 : LOCK(m_send_mutex);
880 : : // Don't count sending-side fields besides m_message_to_send, as they're all small and bounded.
881 [ # # ]: 0 : return m_message_to_send.GetMemoryUsage();
882 : 0 : }
883 : :
884 : : namespace {
885 : :
886 : : /** List of short messages as defined in BIP324, in order.
887 : : *
888 : : * Only message types that are actually implemented in this codebase need to be listed, as other
889 : : * messages get ignored anyway - whether we know how to decode them or not.
890 : : */
891 : : const std::array<std::string, 33> V2_MESSAGE_IDS = {
892 : : "", // 12 bytes follow encoding the message type like in V1
893 : : NetMsgType::ADDR,
894 : : NetMsgType::BLOCK,
895 : : NetMsgType::BLOCKTXN,
896 : : NetMsgType::CMPCTBLOCK,
897 : : NetMsgType::FEEFILTER,
898 : : NetMsgType::FILTERADD,
899 : : NetMsgType::FILTERCLEAR,
900 : : NetMsgType::FILTERLOAD,
901 : : NetMsgType::GETBLOCKS,
902 : : NetMsgType::GETBLOCKTXN,
903 : : NetMsgType::GETDATA,
904 : : NetMsgType::GETHEADERS,
905 : : NetMsgType::HEADERS,
906 : : NetMsgType::INV,
907 : : NetMsgType::MEMPOOL,
908 : : NetMsgType::MERKLEBLOCK,
909 : : NetMsgType::NOTFOUND,
910 : : NetMsgType::PING,
911 : : NetMsgType::PONG,
912 : : NetMsgType::SENDCMPCT,
913 : : NetMsgType::TX,
914 : : NetMsgType::GETCFILTERS,
915 : : NetMsgType::CFILTER,
916 : : NetMsgType::GETCFHEADERS,
917 : : NetMsgType::CFHEADERS,
918 : : NetMsgType::GETCFCHECKPT,
919 : : NetMsgType::CFCHECKPT,
920 : : NetMsgType::ADDRV2,
921 : : // Unimplemented message types that are assigned in BIP324:
922 : : "",
923 : : "",
924 : : "",
925 : : ""
926 : : };
927 : :
928 : : class V2MessageMap
929 : : {
930 : : std::unordered_map<std::string, uint8_t> m_map;
931 : :
932 : : public:
933 : 2 : V2MessageMap() noexcept
934 : 2 : {
935 [ + + ]: 66 : for (size_t i = 1; i < std::size(V2_MESSAGE_IDS); ++i) {
936 : 64 : m_map.emplace(V2_MESSAGE_IDS[i], i);
937 : : }
938 : 2 : }
939 : :
940 : 0 : std::optional<uint8_t> operator()(const std::string& message_name) const noexcept
941 : : {
942 : 0 : auto it = m_map.find(message_name);
943 [ # # ]: 0 : if (it == m_map.end()) return std::nullopt;
944 : 0 : return it->second;
945 : : }
946 : : };
947 : :
948 : : const V2MessageMap V2_MESSAGE_MAP;
949 : :
950 : 0 : std::vector<uint8_t> GenerateRandomGarbage() noexcept
951 : : {
952 : 0 : std::vector<uint8_t> ret;
953 : 0 : FastRandomContext rng;
954 : 0 : ret.resize(rng.randrange(V2Transport::MAX_GARBAGE_LEN + 1));
955 : 0 : rng.fillrand(MakeWritableByteSpan(ret));
956 : 0 : return ret;
957 : 0 : }
958 : :
959 : : } // namespace
960 : :
961 : 0 : void V2Transport::StartSendingHandshake() noexcept
962 : : {
963 : 0 : AssertLockHeld(m_send_mutex);
964 : 0 : Assume(m_send_state == SendState::AWAITING_KEY);
965 : 0 : Assume(m_send_buffer.empty());
966 : : // Initialize the send buffer with ellswift pubkey + provided garbage.
967 : 0 : m_send_buffer.resize(EllSwiftPubKey::size() + m_send_garbage.size());
968 : 0 : std::copy(std::begin(m_cipher.GetOurPubKey()), std::end(m_cipher.GetOurPubKey()), MakeWritableByteSpan(m_send_buffer).begin());
969 : 0 : std::copy(m_send_garbage.begin(), m_send_garbage.end(), m_send_buffer.begin() + EllSwiftPubKey::size());
970 : : // We cannot wipe m_send_garbage as it will still be used as AAD later in the handshake.
971 : 0 : }
972 : :
973 : 0 : V2Transport::V2Transport(NodeId nodeid, bool initiating, const CKey& key, Span<const std::byte> ent32, std::vector<uint8_t> garbage) noexcept
974 : 0 : : m_cipher{key, ent32}, m_initiating{initiating}, m_nodeid{nodeid},
975 : 0 : m_v1_fallback{nodeid},
976 [ # # ]: 0 : m_recv_state{initiating ? RecvState::KEY : RecvState::KEY_MAYBE_V1},
977 : 0 : m_send_garbage{std::move(garbage)},
978 [ # # ]: 0 : m_send_state{initiating ? SendState::AWAITING_KEY : SendState::MAYBE_V1}
979 : : {
980 : 0 : Assume(m_send_garbage.size() <= MAX_GARBAGE_LEN);
981 : : // Start sending immediately if we're the initiator of the connection.
982 [ # # ]: 0 : if (initiating) {
983 : 0 : LOCK(m_send_mutex);
984 [ # # ]: 0 : StartSendingHandshake();
985 : 0 : }
986 : 0 : }
987 : :
988 : 0 : V2Transport::V2Transport(NodeId nodeid, bool initiating) noexcept
989 : 0 : : V2Transport{nodeid, initiating, GenerateRandomKey(),
990 : 0 : MakeByteSpan(GetRandHash()), GenerateRandomGarbage()} {}
991 : :
992 : 0 : void V2Transport::SetReceiveState(RecvState recv_state) noexcept
993 : : {
994 : 0 : AssertLockHeld(m_recv_mutex);
995 : : // Enforce allowed state transitions.
996 [ # # # # : 0 : switch (m_recv_state) {
# # # # ]
997 : 0 : case RecvState::KEY_MAYBE_V1:
998 : 0 : Assume(recv_state == RecvState::KEY || recv_state == RecvState::V1);
999 : 0 : break;
1000 : 0 : case RecvState::KEY:
1001 : 0 : Assume(recv_state == RecvState::GARB_GARBTERM);
1002 : 0 : break;
1003 : 0 : case RecvState::GARB_GARBTERM:
1004 : 0 : Assume(recv_state == RecvState::VERSION);
1005 : 0 : break;
1006 : 0 : case RecvState::VERSION:
1007 : 0 : Assume(recv_state == RecvState::APP);
1008 : 0 : break;
1009 : 0 : case RecvState::APP:
1010 : 0 : Assume(recv_state == RecvState::APP_READY);
1011 : 0 : break;
1012 : 0 : case RecvState::APP_READY:
1013 : 0 : Assume(recv_state == RecvState::APP);
1014 : 0 : break;
1015 : 0 : case RecvState::V1:
1016 : 0 : Assume(false); // V1 state cannot be left
1017 : 0 : break;
1018 : : }
1019 : : // Change state.
1020 : 0 : m_recv_state = recv_state;
1021 : 0 : }
1022 : :
1023 : 0 : void V2Transport::SetSendState(SendState send_state) noexcept
1024 : : {
1025 : 0 : AssertLockHeld(m_send_mutex);
1026 : : // Enforce allowed state transitions.
1027 [ # # # # ]: 0 : switch (m_send_state) {
1028 : 0 : case SendState::MAYBE_V1:
1029 : 0 : Assume(send_state == SendState::V1 || send_state == SendState::AWAITING_KEY);
1030 : 0 : break;
1031 : 0 : case SendState::AWAITING_KEY:
1032 : 0 : Assume(send_state == SendState::READY);
1033 : 0 : break;
1034 : 0 : case SendState::READY:
1035 : 0 : case SendState::V1:
1036 : 0 : Assume(false); // Final states
1037 : 0 : break;
1038 : : }
1039 : : // Change state.
1040 : 0 : m_send_state = send_state;
1041 : 0 : }
1042 : :
1043 : 0 : bool V2Transport::ReceivedMessageComplete() const noexcept
1044 : : {
1045 : 0 : AssertLockNotHeld(m_recv_mutex);
1046 : 0 : LOCK(m_recv_mutex);
1047 [ # # ]: 0 : if (m_recv_state == RecvState::V1) return m_v1_fallback.ReceivedMessageComplete();
1048 : :
1049 : 0 : return m_recv_state == RecvState::APP_READY;
1050 : 0 : }
1051 : :
1052 : 0 : void V2Transport::ProcessReceivedMaybeV1Bytes() noexcept
1053 : : {
1054 : 0 : AssertLockHeld(m_recv_mutex);
1055 : 0 : AssertLockNotHeld(m_send_mutex);
1056 : 0 : Assume(m_recv_state == RecvState::KEY_MAYBE_V1);
1057 : : // We still have to determine if this is a v1 or v2 connection. The bytes being received could
1058 : : // be the beginning of either a v1 packet (network magic + "version\x00\x00\x00\x00\x00"), or
1059 : : // of a v2 public key. BIP324 specifies that a mismatch with this 16-byte string should trigger
1060 : : // sending of the key.
1061 : 0 : 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};
1062 : 0 : std::copy(std::begin(Params().MessageStart()), std::end(Params().MessageStart()), v1_prefix.begin());
1063 : 0 : Assume(m_recv_buffer.size() <= v1_prefix.size());
1064 [ # # ]: 0 : if (!std::equal(m_recv_buffer.begin(), m_recv_buffer.end(), v1_prefix.begin())) {
1065 : : // Mismatch with v1 prefix, so we can assume a v2 connection.
1066 : 0 : SetReceiveState(RecvState::KEY); // Convert to KEY state, leaving received bytes around.
1067 : : // Transition the sender to AWAITING_KEY state and start sending.
1068 : 0 : LOCK(m_send_mutex);
1069 : 0 : SetSendState(SendState::AWAITING_KEY);
1070 [ # # ]: 0 : StartSendingHandshake();
1071 [ # # ]: 0 : } else if (m_recv_buffer.size() == v1_prefix.size()) {
1072 : : // Full match with the v1 prefix, so fall back to v1 behavior.
1073 : 0 : LOCK(m_send_mutex);
1074 : 0 : Span<const uint8_t> feedback{m_recv_buffer};
1075 : : // Feed already received bytes to v1 transport. It should always accept these, because it's
1076 : : // less than the size of a v1 header, and these are the first bytes fed to m_v1_fallback.
1077 : 0 : bool ret = m_v1_fallback.ReceivedBytes(feedback);
1078 : 0 : Assume(feedback.empty());
1079 : 0 : Assume(ret);
1080 : 0 : SetReceiveState(RecvState::V1);
1081 : 0 : SetSendState(SendState::V1);
1082 : : // Reset v2 transport buffers to save memory.
1083 : 0 : ClearShrink(m_recv_buffer);
1084 [ # # ]: 0 : ClearShrink(m_send_buffer);
1085 : 0 : } else {
1086 : : // We have not received enough to distinguish v1 from v2 yet. Wait until more bytes come.
1087 : : }
1088 : 0 : }
1089 : :
1090 : 0 : bool V2Transport::ProcessReceivedKeyBytes() noexcept
1091 : : {
1092 : 0 : AssertLockHeld(m_recv_mutex);
1093 : 0 : AssertLockNotHeld(m_send_mutex);
1094 : 0 : Assume(m_recv_state == RecvState::KEY);
1095 : 0 : Assume(m_recv_buffer.size() <= EllSwiftPubKey::size());
1096 : :
1097 : : // As a special exception, if bytes 4-16 of the key on a responder connection match the
1098 : : // corresponding bytes of a V1 version message, but bytes 0-4 don't match the network magic
1099 : : // (if they did, we'd have switched to V1 state already), assume this is a peer from
1100 : : // another network, and disconnect them. They will almost certainly disconnect us too when
1101 : : // they receive our uniformly random key and garbage, but detecting this case specially
1102 : : // means we can log it.
1103 : 0 : static constexpr std::array<uint8_t, 12> MATCH = {'v', 'e', 'r', 's', 'i', 'o', 'n', 0, 0, 0, 0, 0};
1104 : 0 : static constexpr size_t OFFSET = std::tuple_size_v<MessageStartChars>;
1105 [ # # # # ]: 0 : if (!m_initiating && m_recv_buffer.size() >= OFFSET + MATCH.size()) {
1106 [ # # ]: 0 : if (std::equal(MATCH.begin(), MATCH.end(), m_recv_buffer.begin() + OFFSET)) {
1107 [ # # ]: 0 : LogDebug(BCLog::NET, "V2 transport error: V1 peer with wrong MessageStart %s\n",
1108 : : HexStr(Span(m_recv_buffer).first(OFFSET)));
1109 : 0 : return false;
1110 : : }
1111 : : }
1112 : :
1113 [ # # ]: 0 : if (m_recv_buffer.size() == EllSwiftPubKey::size()) {
1114 : : // Other side's key has been fully received, and can now be Diffie-Hellman combined with
1115 : : // our key to initialize the encryption ciphers.
1116 : :
1117 : : // Initialize the ciphers.
1118 : 0 : EllSwiftPubKey ellswift(MakeByteSpan(m_recv_buffer));
1119 : 0 : LOCK(m_send_mutex);
1120 : 0 : m_cipher.Initialize(ellswift, m_initiating);
1121 : :
1122 : : // Switch receiver state to GARB_GARBTERM.
1123 : 0 : SetReceiveState(RecvState::GARB_GARBTERM);
1124 [ # # ]: 0 : m_recv_buffer.clear();
1125 : :
1126 : : // Switch sender state to READY.
1127 : 0 : SetSendState(SendState::READY);
1128 : :
1129 : : // Append the garbage terminator to the send buffer.
1130 : 0 : m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1131 : 0 : std::copy(m_cipher.GetSendGarbageTerminator().begin(),
1132 : 0 : m_cipher.GetSendGarbageTerminator().end(),
1133 : 0 : MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN).begin());
1134 : :
1135 : : // Construct version packet in the send buffer, with the sent garbage data as AAD.
1136 : 0 : m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::EXPANSION + VERSION_CONTENTS.size());
1137 : 0 : m_cipher.Encrypt(
1138 : : /*contents=*/VERSION_CONTENTS,
1139 : 0 : /*aad=*/MakeByteSpan(m_send_garbage),
1140 : : /*ignore=*/false,
1141 : 0 : /*output=*/MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::EXPANSION + VERSION_CONTENTS.size()));
1142 : : // We no longer need the garbage.
1143 [ # # ]: 0 : ClearShrink(m_send_garbage);
1144 : 0 : } else {
1145 : : // We still have to receive more key bytes.
1146 : : }
1147 : : return true;
1148 : : }
1149 : :
1150 : 0 : bool V2Transport::ProcessReceivedGarbageBytes() noexcept
1151 : : {
1152 : 0 : AssertLockHeld(m_recv_mutex);
1153 : 0 : Assume(m_recv_state == RecvState::GARB_GARBTERM);
1154 : 0 : Assume(m_recv_buffer.size() <= MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1155 [ # # ]: 0 : if (m_recv_buffer.size() >= BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
1156 [ # # ]: 0 : if (std::ranges::equal(MakeByteSpan(m_recv_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN), m_cipher.GetReceiveGarbageTerminator())) {
1157 : : // Garbage terminator received. Store garbage to authenticate it as AAD later.
1158 : 0 : m_recv_aad = std::move(m_recv_buffer);
1159 : 0 : m_recv_aad.resize(m_recv_aad.size() - BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1160 [ # # ]: 0 : m_recv_buffer.clear();
1161 : 0 : SetReceiveState(RecvState::VERSION);
1162 [ # # ]: 0 : } else if (m_recv_buffer.size() == MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
1163 : : // We've reached the maximum length for garbage + garbage terminator, and the
1164 : : // terminator still does not match. Abort.
1165 [ # # ]: 0 : LogDebug(BCLog::NET, "V2 transport error: missing garbage terminator, peer=%d\n", m_nodeid);
1166 : 0 : return false;
1167 : : } else {
1168 : : // We still need to receive more garbage and/or garbage terminator bytes.
1169 : : }
1170 : : } else {
1171 : : // We have less than GARBAGE_TERMINATOR_LEN (16) bytes, so we certainly need to receive
1172 : : // more first.
1173 : : }
1174 : : return true;
1175 : : }
1176 : :
1177 : 0 : bool V2Transport::ProcessReceivedPacketBytes() noexcept
1178 : : {
1179 : 0 : AssertLockHeld(m_recv_mutex);
1180 : 0 : Assume(m_recv_state == RecvState::VERSION || m_recv_state == RecvState::APP);
1181 : :
1182 : : // The maximum permitted contents length for a packet, consisting of:
1183 : : // - 0x00 byte: indicating long message type encoding
1184 : : // - 12 bytes of message type
1185 : : // - payload
1186 : 0 : static constexpr size_t MAX_CONTENTS_LEN =
1187 : : 1 + CMessageHeader::COMMAND_SIZE +
1188 : : std::min<size_t>(MAX_SIZE, MAX_PROTOCOL_MESSAGE_LENGTH);
1189 : :
1190 [ # # ]: 0 : if (m_recv_buffer.size() == BIP324Cipher::LENGTH_LEN) {
1191 : : // Length descriptor received.
1192 : 0 : m_recv_len = m_cipher.DecryptLength(MakeByteSpan(m_recv_buffer));
1193 [ # # ]: 0 : if (m_recv_len > MAX_CONTENTS_LEN) {
1194 [ # # ]: 0 : LogDebug(BCLog::NET, "V2 transport error: packet too large (%u bytes), peer=%d\n", m_recv_len, m_nodeid);
1195 : 0 : return false;
1196 : : }
1197 [ # # # # ]: 0 : } else if (m_recv_buffer.size() > BIP324Cipher::LENGTH_LEN && m_recv_buffer.size() == m_recv_len + BIP324Cipher::EXPANSION) {
1198 : : // Ciphertext received, decrypt it into m_recv_decode_buffer.
1199 : : // Note that it is impossible to reach this branch without hitting the branch above first,
1200 : : // as GetMaxBytesToProcess only allows up to LENGTH_LEN into the buffer before that point.
1201 : 0 : m_recv_decode_buffer.resize(m_recv_len);
1202 : 0 : bool ignore{false};
1203 : 0 : bool ret = m_cipher.Decrypt(
1204 : 0 : /*input=*/MakeByteSpan(m_recv_buffer).subspan(BIP324Cipher::LENGTH_LEN),
1205 : 0 : /*aad=*/MakeByteSpan(m_recv_aad),
1206 : : /*ignore=*/ignore,
1207 : : /*contents=*/MakeWritableByteSpan(m_recv_decode_buffer));
1208 [ # # ]: 0 : if (!ret) {
1209 [ # # ]: 0 : LogDebug(BCLog::NET, "V2 transport error: packet decryption failure (%u bytes), peer=%d\n", m_recv_len, m_nodeid);
1210 : 0 : return false;
1211 : : }
1212 : : // We have decrypted a valid packet with the AAD we expected, so clear the expected AAD.
1213 : 0 : ClearShrink(m_recv_aad);
1214 : : // Feed the last 4 bytes of the Poly1305 authentication tag (and its timing) into our RNG.
1215 : 0 : RandAddEvent(ReadLE32(m_recv_buffer.data() + m_recv_buffer.size() - 4));
1216 : :
1217 : : // At this point we have a valid packet decrypted into m_recv_decode_buffer. If it's not a
1218 : : // decoy, which we simply ignore, use the current state to decide what to do with it.
1219 [ # # ]: 0 : if (!ignore) {
1220 [ # # # ]: 0 : switch (m_recv_state) {
1221 : 0 : case RecvState::VERSION:
1222 : : // Version message received; transition to application phase. The contents is
1223 : : // ignored, but can be used for future extensions.
1224 : 0 : SetReceiveState(RecvState::APP);
1225 : 0 : break;
1226 : 0 : case RecvState::APP:
1227 : : // Application message decrypted correctly. It can be extracted using GetMessage().
1228 : 0 : SetReceiveState(RecvState::APP_READY);
1229 : 0 : break;
1230 : 0 : default:
1231 : : // Any other state is invalid (this function should not have been called).
1232 : 0 : Assume(false);
1233 : : }
1234 : : }
1235 : : // Wipe the receive buffer where the next packet will be received into.
1236 : 0 : ClearShrink(m_recv_buffer);
1237 : : // In all but APP_READY state, we can wipe the decoded contents.
1238 [ # # ]: 0 : if (m_recv_state != RecvState::APP_READY) ClearShrink(m_recv_decode_buffer);
1239 : : } else {
1240 : : // We either have less than 3 bytes, so we don't know the packet's length yet, or more
1241 : : // than 3 bytes but less than the packet's full ciphertext. Wait until those arrive.
1242 : : }
1243 : : return true;
1244 : : }
1245 : :
1246 : 0 : size_t V2Transport::GetMaxBytesToProcess() noexcept
1247 : : {
1248 : 0 : AssertLockHeld(m_recv_mutex);
1249 [ # # # # : 0 : switch (m_recv_state) {
# # # ]
1250 : 0 : case RecvState::KEY_MAYBE_V1:
1251 : : // During the KEY_MAYBE_V1 state we do not allow more than the length of v1 prefix into the
1252 : : // receive buffer.
1253 : 0 : Assume(m_recv_buffer.size() <= V1_PREFIX_LEN);
1254 : : // As long as we're not sure if this is a v1 or v2 connection, don't receive more than what
1255 : : // is strictly necessary to distinguish the two (16 bytes). If we permitted more than
1256 : : // the v1 header size (24 bytes), we may not be able to feed the already-received bytes
1257 : : // back into the m_v1_fallback V1 transport.
1258 : 0 : return V1_PREFIX_LEN - m_recv_buffer.size();
1259 : 0 : case RecvState::KEY:
1260 : : // During the KEY state, we only allow the 64-byte key into the receive buffer.
1261 : 0 : Assume(m_recv_buffer.size() <= EllSwiftPubKey::size());
1262 : : // As long as we have not received the other side's public key, don't receive more than
1263 : : // that (64 bytes), as garbage follows, and locating the garbage terminator requires the
1264 : : // key exchange first.
1265 : 0 : return EllSwiftPubKey::size() - m_recv_buffer.size();
1266 : : case RecvState::GARB_GARBTERM:
1267 : : // Process garbage bytes one by one (because terminator may appear anywhere).
1268 : : return 1;
1269 : 0 : case RecvState::VERSION:
1270 : 0 : case RecvState::APP:
1271 : : // These three states all involve decoding a packet. Process the length descriptor first,
1272 : : // so that we know where the current packet ends (and we don't process bytes from the next
1273 : : // packet or decoy yet). Then, process the ciphertext bytes of the current packet.
1274 [ # # ]: 0 : if (m_recv_buffer.size() < BIP324Cipher::LENGTH_LEN) {
1275 : 0 : return BIP324Cipher::LENGTH_LEN - m_recv_buffer.size();
1276 : : } else {
1277 : : // Note that BIP324Cipher::EXPANSION is the total difference between contents size
1278 : : // and encoded packet size, which includes the 3 bytes due to the packet length.
1279 : : // When transitioning from receiving the packet length to receiving its ciphertext,
1280 : : // the encrypted packet length is left in the receive buffer.
1281 : 0 : return BIP324Cipher::EXPANSION + m_recv_len - m_recv_buffer.size();
1282 : : }
1283 : 0 : case RecvState::APP_READY:
1284 : : // No bytes can be processed until GetMessage() is called.
1285 : 0 : return 0;
1286 : 0 : case RecvState::V1:
1287 : : // Not allowed (must be dealt with by the caller).
1288 : 0 : Assume(false);
1289 : 0 : return 0;
1290 : : }
1291 : 0 : Assume(false); // unreachable
1292 : 0 : return 0;
1293 : : }
1294 : :
1295 : 0 : bool V2Transport::ReceivedBytes(Span<const uint8_t>& msg_bytes) noexcept
1296 : : {
1297 : 0 : AssertLockNotHeld(m_recv_mutex);
1298 : : /** How many bytes to allocate in the receive buffer at most above what is received so far. */
1299 : 0 : static constexpr size_t MAX_RESERVE_AHEAD = 256 * 1024;
1300 : :
1301 : 0 : LOCK(m_recv_mutex);
1302 [ # # ]: 0 : if (m_recv_state == RecvState::V1) return m_v1_fallback.ReceivedBytes(msg_bytes);
1303 : :
1304 : : // Process the provided bytes in msg_bytes in a loop. In each iteration a nonzero number of
1305 : : // bytes (decided by GetMaxBytesToProcess) are taken from the beginning om msg_bytes, and
1306 : : // appended to m_recv_buffer. Then, depending on the receiver state, one of the
1307 : : // ProcessReceived*Bytes functions is called to process the bytes in that buffer.
1308 [ # # ]: 0 : while (!msg_bytes.empty()) {
1309 : : // Decide how many bytes to copy from msg_bytes to m_recv_buffer.
1310 : 0 : size_t max_read = GetMaxBytesToProcess();
1311 : :
1312 : : // Reserve space in the buffer if there is not enough.
1313 [ # # # # ]: 0 : if (m_recv_buffer.size() + std::min(msg_bytes.size(), max_read) > m_recv_buffer.capacity()) {
1314 [ # # # # : 0 : switch (m_recv_state) {
# ]
1315 : 0 : case RecvState::KEY_MAYBE_V1:
1316 : 0 : case RecvState::KEY:
1317 : 0 : case RecvState::GARB_GARBTERM:
1318 : : // During the initial states (key/garbage), allocate once to fit the maximum (4111
1319 : : // bytes).
1320 : 0 : m_recv_buffer.reserve(MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1321 : 0 : break;
1322 : 0 : case RecvState::VERSION:
1323 : 0 : case RecvState::APP: {
1324 : : // During states where a packet is being received, as much as is expected but never
1325 : : // more than MAX_RESERVE_AHEAD bytes in addition to what is received so far.
1326 : : // This means attackers that want to cause us to waste allocated memory are limited
1327 : : // to MAX_RESERVE_AHEAD above the largest allowed message contents size, and to
1328 : : // MAX_RESERVE_AHEAD more than they've actually sent us.
1329 [ # # ]: 0 : size_t alloc_add = std::min(max_read, msg_bytes.size() + MAX_RESERVE_AHEAD);
1330 : 0 : m_recv_buffer.reserve(m_recv_buffer.size() + alloc_add);
1331 : 0 : break;
1332 : : }
1333 : 0 : case RecvState::APP_READY:
1334 : : // The buffer is empty in this state.
1335 : 0 : Assume(m_recv_buffer.empty());
1336 : 0 : break;
1337 : 0 : case RecvState::V1:
1338 : : // Should have bailed out above.
1339 : 0 : Assume(false);
1340 : 0 : break;
1341 : : }
1342 : : }
1343 : :
1344 : : // Can't read more than provided input.
1345 [ # # ]: 0 : max_read = std::min(msg_bytes.size(), max_read);
1346 : : // Copy data to buffer.
1347 : 0 : m_recv_buffer.insert(m_recv_buffer.end(), UCharCast(msg_bytes.data()), UCharCast(msg_bytes.data() + max_read));
1348 [ # # # # : 0 : msg_bytes = msg_bytes.subspan(max_read);
# # # ]
1349 : :
1350 : : // Process data in the buffer.
1351 [ # # # # : 0 : switch (m_recv_state) {
# # # ]
1352 : 0 : case RecvState::KEY_MAYBE_V1:
1353 : 0 : ProcessReceivedMaybeV1Bytes();
1354 [ # # ]: 0 : if (m_recv_state == RecvState::V1) return true;
1355 : : break;
1356 : :
1357 : 0 : case RecvState::KEY:
1358 [ # # ]: 0 : if (!ProcessReceivedKeyBytes()) return false;
1359 : : break;
1360 : :
1361 : 0 : case RecvState::GARB_GARBTERM:
1362 [ # # ]: 0 : if (!ProcessReceivedGarbageBytes()) return false;
1363 : : break;
1364 : :
1365 : 0 : case RecvState::VERSION:
1366 : 0 : case RecvState::APP:
1367 [ # # ]: 0 : if (!ProcessReceivedPacketBytes()) return false;
1368 : : break;
1369 : :
1370 : : case RecvState::APP_READY:
1371 : : return true;
1372 : :
1373 : 0 : case RecvState::V1:
1374 : : // We should have bailed out before.
1375 : 0 : Assume(false);
1376 : 0 : break;
1377 : : }
1378 : : // Make sure we have made progress before continuing.
1379 : 0 : Assume(max_read > 0);
1380 : : }
1381 : :
1382 : : return true;
1383 : 0 : }
1384 : :
1385 : 0 : std::optional<std::string> V2Transport::GetMessageType(Span<const uint8_t>& contents) noexcept
1386 : : {
1387 [ # # ]: 0 : if (contents.size() == 0) return std::nullopt; // Empty contents
1388 [ # # ]: 0 : uint8_t first_byte = contents[0];
1389 [ # # ]: 0 : contents = contents.subspan(1); // Strip first byte.
1390 : :
1391 [ # # ]: 0 : if (first_byte != 0) {
1392 : : // Short (1 byte) encoding.
1393 [ # # ]: 0 : if (first_byte < std::size(V2_MESSAGE_IDS)) {
1394 : : // Valid short message id.
1395 : 0 : return V2_MESSAGE_IDS[first_byte];
1396 : : } else {
1397 : : // Unknown short message id.
1398 : 0 : return std::nullopt;
1399 : : }
1400 : : }
1401 : :
1402 [ # # ]: 0 : if (contents.size() < CMessageHeader::COMMAND_SIZE) {
1403 : 0 : return std::nullopt; // Long encoding needs 12 message type bytes.
1404 : : }
1405 : :
1406 : : size_t msg_type_len{0};
1407 [ # # # # ]: 0 : while (msg_type_len < CMessageHeader::COMMAND_SIZE && contents[msg_type_len] != 0) {
1408 : : // Verify that message type bytes before the first 0x00 are in range.
1409 [ # # # # ]: 0 : if (contents[msg_type_len] < ' ' || contents[msg_type_len] > 0x7F) {
1410 : 0 : return {};
1411 : : }
1412 : 0 : ++msg_type_len;
1413 : : }
1414 : 0 : std::string ret{reinterpret_cast<const char*>(contents.data()), msg_type_len};
1415 [ # # ]: 0 : while (msg_type_len < CMessageHeader::COMMAND_SIZE) {
1416 : : // Verify that message type bytes after the first 0x00 are also 0x00.
1417 [ # # ]: 0 : if (contents[msg_type_len] != 0) return {};
1418 : 0 : ++msg_type_len;
1419 : : }
1420 : : // Strip message type bytes of contents.
1421 : 0 : contents = contents.subspan(CMessageHeader::COMMAND_SIZE);
1422 : 0 : return ret;
1423 : 0 : }
1424 : :
1425 : 0 : CNetMessage V2Transport::GetReceivedMessage(std::chrono::microseconds time, bool& reject_message) noexcept
1426 : : {
1427 : 0 : AssertLockNotHeld(m_recv_mutex);
1428 : 0 : LOCK(m_recv_mutex);
1429 [ # # ]: 0 : if (m_recv_state == RecvState::V1) return m_v1_fallback.GetReceivedMessage(time, reject_message);
1430 : :
1431 : 0 : Assume(m_recv_state == RecvState::APP_READY);
1432 : 0 : Span<const uint8_t> contents{m_recv_decode_buffer};
1433 : 0 : auto msg_type = GetMessageType(contents);
1434 : 0 : CNetMessage msg{DataStream{}};
1435 : : // Note that BIP324Cipher::EXPANSION also includes the length descriptor size.
1436 [ # # ]: 0 : msg.m_raw_message_size = m_recv_decode_buffer.size() + BIP324Cipher::EXPANSION;
1437 [ # # ]: 0 : if (msg_type) {
1438 : 0 : reject_message = false;
1439 : 0 : msg.m_type = std::move(*msg_type);
1440 : 0 : msg.m_time = time;
1441 : 0 : msg.m_message_size = contents.size();
1442 : 0 : msg.m_recv.resize(contents.size());
1443 : 0 : std::copy(contents.begin(), contents.end(), UCharCast(msg.m_recv.data()));
1444 : : } else {
1445 [ # # ]: 0 : LogDebug(BCLog::NET, "V2 transport error: invalid message type (%u bytes contents), peer=%d\n", m_recv_decode_buffer.size(), m_nodeid);
1446 : 0 : reject_message = true;
1447 : : }
1448 : 0 : ClearShrink(m_recv_decode_buffer);
1449 : 0 : SetReceiveState(RecvState::APP);
1450 : :
1451 : 0 : return msg;
1452 : 0 : }
1453 : :
1454 : 0 : bool V2Transport::SetMessageToSend(CSerializedNetMsg& msg) noexcept
1455 : : {
1456 : 0 : AssertLockNotHeld(m_send_mutex);
1457 : 0 : LOCK(m_send_mutex);
1458 [ # # ]: 0 : if (m_send_state == SendState::V1) return m_v1_fallback.SetMessageToSend(msg);
1459 : : // We only allow adding a new message to be sent when in the READY state (so the packet cipher
1460 : : // is available) and the send buffer is empty. This limits the number of messages in the send
1461 : : // buffer to just one, and leaves the responsibility for queueing them up to the caller.
1462 [ # # # # ]: 0 : if (!(m_send_state == SendState::READY && m_send_buffer.empty())) return false;
1463 : : // Construct contents (encoding message type + payload).
1464 : 0 : std::vector<uint8_t> contents;
1465 : 0 : auto short_message_id = V2_MESSAGE_MAP(msg.m_type);
1466 [ # # ]: 0 : if (short_message_id) {
1467 : 0 : contents.resize(1 + msg.data.size());
1468 : 0 : contents[0] = *short_message_id;
1469 : 0 : std::copy(msg.data.begin(), msg.data.end(), contents.begin() + 1);
1470 : : } else {
1471 : : // Initialize with zeroes, and then write the message type string starting at offset 1.
1472 : : // This means contents[0] and the unused positions in contents[1..13] remain 0x00.
1473 : 0 : contents.resize(1 + CMessageHeader::COMMAND_SIZE + msg.data.size(), 0);
1474 : 0 : std::copy(msg.m_type.begin(), msg.m_type.end(), contents.data() + 1);
1475 : 0 : std::copy(msg.data.begin(), msg.data.end(), contents.begin() + 1 + CMessageHeader::COMMAND_SIZE);
1476 : : }
1477 : : // Construct ciphertext in send buffer.
1478 : 0 : m_send_buffer.resize(contents.size() + BIP324Cipher::EXPANSION);
1479 : 0 : m_cipher.Encrypt(MakeByteSpan(contents), {}, false, MakeWritableByteSpan(m_send_buffer));
1480 : 0 : m_send_type = msg.m_type;
1481 : : // Release memory
1482 : 0 : ClearShrink(msg.data);
1483 : 0 : return true;
1484 : 0 : }
1485 : :
1486 : 0 : Transport::BytesToSend V2Transport::GetBytesToSend(bool have_next_message) const noexcept
1487 : : {
1488 : 0 : AssertLockNotHeld(m_send_mutex);
1489 : 0 : LOCK(m_send_mutex);
1490 [ # # ]: 0 : if (m_send_state == SendState::V1) return m_v1_fallback.GetBytesToSend(have_next_message);
1491 : :
1492 [ # # ]: 0 : if (m_send_state == SendState::MAYBE_V1) Assume(m_send_buffer.empty());
1493 : 0 : Assume(m_send_pos <= m_send_buffer.size());
1494 : 0 : return {
1495 [ # # ]: 0 : Span{m_send_buffer}.subspan(m_send_pos),
1496 : : // We only have more to send after the current m_send_buffer if there is a (next)
1497 : : // message to be sent, and we're capable of sending packets. */
1498 [ # # # # ]: 0 : have_next_message && m_send_state == SendState::READY,
1499 : 0 : m_send_type
1500 : 0 : };
1501 : 0 : }
1502 : :
1503 : 0 : void V2Transport::MarkBytesSent(size_t bytes_sent) noexcept
1504 : : {
1505 : 0 : AssertLockNotHeld(m_send_mutex);
1506 : 0 : LOCK(m_send_mutex);
1507 [ # # # # ]: 0 : if (m_send_state == SendState::V1) return m_v1_fallback.MarkBytesSent(bytes_sent);
1508 : :
1509 [ # # # # : 0 : if (m_send_state == SendState::AWAITING_KEY && m_send_pos == 0 && bytes_sent > 0) {
# # ]
1510 [ # # ]: 0 : LogDebug(BCLog::NET, "start sending v2 handshake to peer=%d\n", m_nodeid);
1511 : : }
1512 : :
1513 : 0 : m_send_pos += bytes_sent;
1514 : 0 : Assume(m_send_pos <= m_send_buffer.size());
1515 [ # # ]: 0 : if (m_send_pos >= CMessageHeader::HEADER_SIZE) {
1516 : 0 : m_sent_v1_header_worth = true;
1517 : : }
1518 : : // Wipe the buffer when everything is sent.
1519 [ # # ]: 0 : if (m_send_pos == m_send_buffer.size()) {
1520 : 0 : m_send_pos = 0;
1521 : 0 : ClearShrink(m_send_buffer);
1522 : : }
1523 : 0 : }
1524 : :
1525 : 0 : bool V2Transport::ShouldReconnectV1() const noexcept
1526 : : {
1527 : 0 : AssertLockNotHeld(m_send_mutex);
1528 : 0 : AssertLockNotHeld(m_recv_mutex);
1529 : : // Only outgoing connections need reconnection.
1530 [ # # ]: 0 : if (!m_initiating) return false;
1531 : :
1532 : 0 : LOCK(m_recv_mutex);
1533 : : // We only reconnect in the very first state and when the receive buffer is empty. Together
1534 : : // these conditions imply nothing has been received so far.
1535 [ # # ]: 0 : if (m_recv_state != RecvState::KEY) return false;
1536 [ # # ]: 0 : if (!m_recv_buffer.empty()) return false;
1537 : : // Check if we've sent enough for the other side to disconnect us (if it was V1).
1538 : 0 : LOCK(m_send_mutex);
1539 [ # # ]: 0 : return m_sent_v1_header_worth;
1540 : 0 : }
1541 : :
1542 : 0 : size_t V2Transport::GetSendMemoryUsage() const noexcept
1543 : : {
1544 : 0 : AssertLockNotHeld(m_send_mutex);
1545 : 0 : LOCK(m_send_mutex);
1546 [ # # ]: 0 : if (m_send_state == SendState::V1) return m_v1_fallback.GetSendMemoryUsage();
1547 : :
1548 [ # # ]: 0 : return sizeof(m_send_buffer) + memusage::DynamicUsage(m_send_buffer);
1549 : 0 : }
1550 : :
1551 : 0 : Transport::Info V2Transport::GetInfo() const noexcept
1552 : : {
1553 : 0 : AssertLockNotHeld(m_recv_mutex);
1554 : 0 : LOCK(m_recv_mutex);
1555 [ # # ]: 0 : if (m_recv_state == RecvState::V1) return m_v1_fallback.GetInfo();
1556 : :
1557 [ # # ]: 0 : Transport::Info info;
1558 : :
1559 : : // Do not report v2 and session ID until the version packet has been received
1560 : : // and verified (confirming that the other side very likely has the same keys as us).
1561 [ # # ]: 0 : if (m_recv_state != RecvState::KEY_MAYBE_V1 && m_recv_state != RecvState::KEY &&
1562 : : m_recv_state != RecvState::GARB_GARBTERM && m_recv_state != RecvState::VERSION) {
1563 : 0 : info.transport_type = TransportProtocolType::V2;
1564 : 0 : info.session_id = uint256(MakeUCharSpan(m_cipher.GetSessionID()));
1565 : : } else {
1566 : 0 : info.transport_type = TransportProtocolType::DETECTING;
1567 : : }
1568 : :
1569 : 0 : return info;
1570 : 0 : }
1571 : :
1572 : 0 : std::pair<size_t, bool> CConnman::SocketSendData(CNode& node) const
1573 : : {
1574 : 0 : auto it = node.vSendMsg.begin();
1575 : 0 : size_t nSentSize = 0;
1576 : 0 : bool data_left{false}; //!< second return value (whether unsent data remains)
1577 : 0 : std::optional<bool> expected_more;
1578 : :
1579 : 0 : while (true) {
1580 [ # # ]: 0 : if (it != node.vSendMsg.end()) {
1581 : : // If possible, move one message from the send queue to the transport. This fails when
1582 : : // there is an existing message still being sent, or (for v2 transports) when the
1583 : : // handshake has not yet completed.
1584 : 0 : size_t memusage = it->GetMemoryUsage();
1585 [ # # ]: 0 : if (node.m_transport->SetMessageToSend(*it)) {
1586 : : // Update memory usage of send buffer (as *it will be deleted).
1587 : 0 : node.m_send_memusage -= memusage;
1588 : 0 : ++it;
1589 : : }
1590 : : }
1591 [ # # ]: 0 : const auto& [data, more, msg_type] = node.m_transport->GetBytesToSend(it != node.vSendMsg.end());
1592 : : // We rely on the 'more' value returned by GetBytesToSend to correctly predict whether more
1593 : : // bytes are still to be sent, to correctly set the MSG_MORE flag. As a sanity check,
1594 : : // verify that the previously returned 'more' was correct.
1595 [ # # ]: 0 : if (expected_more.has_value()) Assume(!data.empty() == *expected_more);
1596 [ # # ]: 0 : expected_more = more;
1597 [ # # ]: 0 : data_left = !data.empty(); // will be overwritten on next loop if all of data gets sent
1598 : 0 : int nBytes = 0;
1599 [ # # ]: 0 : if (!data.empty()) {
1600 : 0 : LOCK(node.m_sock_mutex);
1601 : : // There is no socket in case we've already disconnected, or in test cases without
1602 : : // real connections. In these cases, we bail out immediately and just leave things
1603 : : // in the send queue and transport.
1604 [ # # ]: 0 : if (!node.m_sock) {
1605 : : break;
1606 : : }
1607 : 0 : int flags = MSG_NOSIGNAL | MSG_DONTWAIT;
1608 : : #ifdef MSG_MORE
1609 [ # # ]: 0 : if (more) {
1610 : 0 : flags |= MSG_MORE;
1611 : : }
1612 : : #endif
1613 [ # # # # ]: 0 : nBytes = node.m_sock->Send(reinterpret_cast<const char*>(data.data()), data.size(), flags);
1614 : 0 : }
1615 [ # # ]: 0 : if (nBytes > 0) {
1616 : 0 : node.m_last_send = GetTime<std::chrono::seconds>();
1617 : 0 : node.nSendBytes += nBytes;
1618 : : // Notify transport that bytes have been processed.
1619 : 0 : node.m_transport->MarkBytesSent(nBytes);
1620 : : // Update statistics per message type.
1621 [ # # ]: 0 : if (!msg_type.empty()) { // don't report v2 handshake bytes for now
1622 : 0 : node.AccountForSentBytes(msg_type, nBytes);
1623 : : }
1624 : 0 : nSentSize += nBytes;
1625 [ # # ]: 0 : if ((size_t)nBytes != data.size()) {
1626 : : // could not send full message; stop sending more
1627 : : break;
1628 : : }
1629 : : } else {
1630 [ # # ]: 0 : if (nBytes < 0) {
1631 : : // error
1632 : 0 : int nErr = WSAGetLastError();
1633 [ # # # # ]: 0 : if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS) {
1634 [ # # # # ]: 0 : LogDebug(BCLog::NET, "socket send error for peer=%d: %s\n", node.GetId(), NetworkErrorString(nErr));
1635 : 0 : node.CloseSocketDisconnect();
1636 : : }
1637 : : }
1638 : : break;
1639 : : }
1640 : : }
1641 : :
1642 [ # # ]: 0 : node.fPauseSend = node.m_send_memusage + node.m_transport->GetSendMemoryUsage() > nSendBufferMaxSize;
1643 : :
1644 [ # # ]: 0 : if (it == node.vSendMsg.end()) {
1645 [ # # ]: 0 : assert(node.m_send_memusage == 0);
1646 : : }
1647 : 0 : node.vSendMsg.erase(node.vSendMsg.begin(), it);
1648 : 0 : return {nSentSize, data_left};
1649 : : }
1650 : :
1651 : : /** Try to find a connection to evict when the node is full.
1652 : : * Extreme care must be taken to avoid opening the node to attacker
1653 : : * triggered network partitioning.
1654 : : * The strategy used here is to protect a small number of peers
1655 : : * for each of several distinct characteristics which are difficult
1656 : : * to forge. In order to partition a node the attacker must be
1657 : : * simultaneously better at all of them than honest peers.
1658 : : */
1659 : 0 : bool CConnman::AttemptToEvictConnection()
1660 : : {
1661 : 0 : std::vector<NodeEvictionCandidate> vEvictionCandidates;
1662 : 0 : {
1663 : :
1664 [ # # ]: 0 : LOCK(m_nodes_mutex);
1665 [ # # ]: 0 : for (const CNode* node : m_nodes) {
1666 [ # # ]: 0 : if (node->fDisconnect)
1667 : 0 : continue;
1668 : 0 : NodeEvictionCandidate candidate{
1669 : 0 : .id = node->GetId(),
1670 : : .m_connected = node->m_connected,
1671 : 0 : .m_min_ping_time = node->m_min_ping_time,
1672 : 0 : .m_last_block_time = node->m_last_block_time,
1673 : 0 : .m_last_tx_time = node->m_last_tx_time,
1674 [ # # ]: 0 : .fRelevantServices = node->m_has_all_wanted_services,
1675 : 0 : .m_relay_txs = node->m_relays_txs.load(),
1676 : 0 : .fBloomFilter = node->m_bloom_filter_loaded.load(),
1677 : 0 : .nKeyedNetGroup = node->nKeyedNetGroup,
1678 : 0 : .prefer_evict = node->m_prefer_evict,
1679 [ # # ]: 0 : .m_is_local = node->addr.IsLocal(),
1680 : 0 : .m_network = node->ConnectedThroughNetwork(),
1681 : 0 : .m_noban = node->HasPermission(NetPermissionFlags::NoBan),
1682 : 0 : .m_conn_type = node->m_conn_type,
1683 [ # # # # : 0 : };
# # ]
1684 [ # # ]: 0 : vEvictionCandidates.push_back(candidate);
1685 : : }
1686 : 0 : }
1687 [ # # ]: 0 : const std::optional<NodeId> node_id_to_evict = SelectNodeToEvict(std::move(vEvictionCandidates));
1688 [ # # ]: 0 : if (!node_id_to_evict) {
1689 : : return false;
1690 : : }
1691 [ # # ]: 0 : LOCK(m_nodes_mutex);
1692 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
1693 [ # # ]: 0 : if (pnode->GetId() == *node_id_to_evict) {
1694 [ # # # # : 0 : LogDebug(BCLog::NET, "selected %s connection for eviction peer=%d; disconnecting\n", pnode->ConnectionTypeAsString(), pnode->GetId());
# # # # ]
1695 : 0 : pnode->fDisconnect = true;
1696 : 0 : return true;
1697 : : }
1698 : : }
1699 : : return false;
1700 : 0 : }
1701 : :
1702 : 0 : void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
1703 : 0 : struct sockaddr_storage sockaddr;
1704 : 0 : socklen_t len = sizeof(sockaddr);
1705 : 0 : auto sock = hListenSocket.sock->Accept((struct sockaddr*)&sockaddr, &len);
1706 [ # # ]: 0 : CAddress addr;
1707 : :
1708 [ # # ]: 0 : if (!sock) {
1709 : 0 : const int nErr = WSAGetLastError();
1710 [ # # ]: 0 : if (nErr != WSAEWOULDBLOCK) {
1711 [ # # # # ]: 0 : LogPrintf("socket error accept failed: %s\n", NetworkErrorString(nErr));
1712 : : }
1713 : 0 : return;
1714 : : }
1715 : :
1716 [ # # # # ]: 0 : if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr)) {
1717 [ # # # # : 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Warning, "Unknown socket family\n");
# # ]
1718 : : } else {
1719 [ # # ]: 0 : addr = CAddress{MaybeFlipIPv6toCJDNS(addr), NODE_NONE};
1720 : : }
1721 : :
1722 [ # # # # ]: 0 : const CAddress addr_bind{MaybeFlipIPv6toCJDNS(GetBindAddress(*sock)), NODE_NONE};
1723 : :
1724 : 0 : NetPermissionFlags permission_flags = NetPermissionFlags::None;
1725 [ # # ]: 0 : hListenSocket.AddSocketPermissionFlags(permission_flags);
1726 : :
1727 [ # # ]: 0 : CreateNodeFromAcceptedSocket(std::move(sock), permission_flags, addr_bind, addr);
1728 : 0 : }
1729 : :
1730 : 0 : void CConnman::CreateNodeFromAcceptedSocket(std::unique_ptr<Sock>&& sock,
1731 : : NetPermissionFlags permission_flags,
1732 : : const CAddress& addr_bind,
1733 : : const CAddress& addr)
1734 : : {
1735 : 0 : int nInbound = 0;
1736 : :
1737 : 0 : AddWhitelistPermissionFlags(permission_flags, addr, vWhitelistedRangeIncoming);
1738 : :
1739 : 0 : {
1740 : 0 : LOCK(m_nodes_mutex);
1741 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
1742 [ # # ]: 0 : if (pnode->IsInboundConn()) nInbound++;
1743 : : }
1744 : 0 : }
1745 : :
1746 [ # # ]: 0 : if (!fNetworkActive) {
1747 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s dropped: not accepting new connections\n", addr.ToStringAddrPort());
1748 : 0 : return;
1749 : : }
1750 : :
1751 [ # # ]: 0 : if (!sock->IsSelectable()) {
1752 [ # # ]: 0 : LogPrintf("connection from %s dropped: non-selectable socket\n", addr.ToStringAddrPort());
1753 : 0 : return;
1754 : : }
1755 : :
1756 : : // According to the internet TCP_NODELAY is not carried into accepted sockets
1757 : : // on all platforms. Set it again here just to be sure.
1758 : 0 : const int on{1};
1759 [ # # ]: 0 : if (sock->SetSockOpt(IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) == SOCKET_ERROR) {
1760 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s: unable to set TCP_NODELAY, continuing anyway\n",
1761 : : addr.ToStringAddrPort());
1762 : : }
1763 : :
1764 : : // Don't accept connections from banned peers.
1765 [ # # # # ]: 0 : bool banned = m_banman && m_banman->IsBanned(addr);
1766 [ # # # # ]: 0 : if (!NetPermissions::HasFlag(permission_flags, NetPermissionFlags::NoBan) && banned)
1767 : : {
1768 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s dropped (banned)\n", addr.ToStringAddrPort());
1769 : 0 : return;
1770 : : }
1771 : :
1772 : : // Only accept connections from discouraged peers if our inbound slots aren't (almost) full.
1773 [ # # # # ]: 0 : bool discouraged = m_banman && m_banman->IsDiscouraged(addr);
1774 [ # # # # : 0 : if (!NetPermissions::HasFlag(permission_flags, NetPermissionFlags::NoBan) && nInbound + 1 >= m_max_inbound && discouraged)
# # ]
1775 : : {
1776 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s dropped (discouraged)\n", addr.ToStringAddrPort());
1777 : 0 : return;
1778 : : }
1779 : :
1780 [ # # ]: 0 : if (nInbound >= m_max_inbound)
1781 : : {
1782 [ # # ]: 0 : if (!AttemptToEvictConnection()) {
1783 : : // No connection to evict, disconnect the new connection
1784 [ # # ]: 0 : LogDebug(BCLog::NET, "failed to find an eviction candidate - connection dropped (full)\n");
1785 : 0 : return;
1786 : : }
1787 : : }
1788 : :
1789 : 0 : NodeId id = GetNewNodeId();
1790 : 0 : uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
1791 : :
1792 : 0 : const bool inbound_onion = std::find(m_onion_binds.begin(), m_onion_binds.end(), addr_bind) != m_onion_binds.end();
1793 : : // The V2Transport transparently falls back to V1 behavior when an incoming V1 connection is
1794 : : // detected, so use it whenever we signal NODE_P2P_V2.
1795 : 0 : ServiceFlags local_services = GetLocalServices();
1796 : 0 : const bool use_v2transport(local_services & NODE_P2P_V2);
1797 : :
1798 : 0 : CNode* pnode = new CNode(id,
1799 : : std::move(sock),
1800 : : addr,
1801 : : CalculateKeyedNetGroup(addr),
1802 : : nonce,
1803 : : addr_bind,
1804 : : /*addrNameIn=*/"",
1805 : : ConnectionType::INBOUND,
1806 : : inbound_onion,
1807 [ # # ]: 0 : CNodeOptions{
1808 : : .permission_flags = permission_flags,
1809 : : .prefer_evict = discouraged,
1810 : 0 : .recv_flood_size = nReceiveFloodSize,
1811 : : .use_v2transport = use_v2transport,
1812 [ # # # # : 0 : });
# # # # #
# ]
1813 : 0 : pnode->AddRef();
1814 : 0 : m_msgproc->InitializeNode(*pnode, local_services);
1815 : 0 : {
1816 : 0 : LOCK(m_nodes_mutex);
1817 [ # # ]: 0 : m_nodes.push_back(pnode);
1818 : 0 : }
1819 [ # # # # ]: 0 : LogDebug(BCLog::NET, "connection from %s accepted\n", addr.ToStringAddrPort());
1820 : :
1821 : : // We received a new connection, harvest entropy from the time (and our peer count)
1822 : 0 : RandAddEvent((uint32_t)id);
1823 : : }
1824 : :
1825 : 0 : bool CConnman::AddConnection(const std::string& address, ConnectionType conn_type, bool use_v2transport = false)
1826 : : {
1827 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
1828 : 0 : std::optional<int> max_connections;
1829 [ # # # # ]: 0 : switch (conn_type) {
1830 : : case ConnectionType::INBOUND:
1831 : : case ConnectionType::MANUAL:
1832 : : return false;
1833 : 0 : case ConnectionType::OUTBOUND_FULL_RELAY:
1834 : 0 : max_connections = m_max_outbound_full_relay;
1835 : 0 : break;
1836 : 0 : case ConnectionType::BLOCK_RELAY:
1837 : 0 : max_connections = m_max_outbound_block_relay;
1838 : 0 : break;
1839 : : // no limit for ADDR_FETCH because -seednode has no limit either
1840 : : case ConnectionType::ADDR_FETCH:
1841 : : break;
1842 : : // no limit for FEELER connections since they're short-lived
1843 : : case ConnectionType::FEELER:
1844 : : break;
1845 : : } // no default case, so the compiler can warn about missing cases
1846 : :
1847 : : // Count existing connections
1848 [ # # # # ]: 0 : int existing_connections = WITH_LOCK(m_nodes_mutex,
1849 : : return std::count_if(m_nodes.begin(), m_nodes.end(), [conn_type](CNode* node) { return node->m_conn_type == conn_type; }););
1850 : :
1851 : : // Max connections of specified type already exist
1852 [ # # ]: 0 : if (max_connections != std::nullopt && existing_connections >= max_connections) return false;
1853 : :
1854 : : // Max total outbound connections already exist
1855 : 0 : CSemaphoreGrant grant(*semOutbound, true);
1856 [ # # ]: 0 : if (!grant) return false;
1857 : :
1858 [ # # # # ]: 0 : OpenNetworkConnection(CAddress(), false, std::move(grant), address.c_str(), conn_type, /*use_v2transport=*/use_v2transport);
1859 : 0 : return true;
1860 : : }
1861 : :
1862 : 0 : void CConnman::DisconnectNodes()
1863 : : {
1864 : 0 : AssertLockNotHeld(m_nodes_mutex);
1865 : 0 : AssertLockNotHeld(m_reconnections_mutex);
1866 : :
1867 : : // Use a temporary variable to accumulate desired reconnections, so we don't need
1868 : : // m_reconnections_mutex while holding m_nodes_mutex.
1869 [ # # ]: 0 : decltype(m_reconnections) reconnections_to_add;
1870 : :
1871 : 0 : {
1872 [ # # ]: 0 : LOCK(m_nodes_mutex);
1873 : :
1874 [ # # ]: 0 : if (!fNetworkActive) {
1875 : : // Disconnect any connected nodes
1876 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
1877 [ # # ]: 0 : if (!pnode->fDisconnect) {
1878 [ # # # # : 0 : LogDebug(BCLog::NET, "Network not active, dropping peer=%d\n", pnode->GetId());
# # ]
1879 : 0 : pnode->fDisconnect = true;
1880 : : }
1881 : : }
1882 : : }
1883 : :
1884 : : // Disconnect unused nodes
1885 [ # # ]: 0 : std::vector<CNode*> nodes_copy = m_nodes;
1886 [ # # ]: 0 : for (CNode* pnode : nodes_copy)
1887 : : {
1888 [ # # ]: 0 : if (pnode->fDisconnect)
1889 : : {
1890 : : // remove from m_nodes
1891 : 0 : m_nodes.erase(remove(m_nodes.begin(), m_nodes.end(), pnode), m_nodes.end());
1892 : :
1893 : : // Add to reconnection list if appropriate. We don't reconnect right here, because
1894 : : // the creation of a connection is a blocking operation (up to several seconds),
1895 : : // and we don't want to hold up the socket handler thread for that long.
1896 [ # # ]: 0 : if (pnode->m_transport->ShouldReconnectV1()) {
1897 : 0 : reconnections_to_add.push_back({
1898 : 0 : .addr_connect = pnode->addr,
1899 [ # # ]: 0 : .grant = std::move(pnode->grantOutbound),
1900 : 0 : .destination = pnode->m_dest,
1901 : 0 : .conn_type = pnode->m_conn_type,
1902 : : .use_v2transport = false});
1903 [ # # # # : 0 : LogDebug(BCLog::NET, "retrying with v1 transport protocol for peer=%d\n", pnode->GetId());
# # ]
1904 : : }
1905 : :
1906 : : // release outbound grant (if any)
1907 : 0 : pnode->grantOutbound.Release();
1908 : :
1909 : : // close socket and cleanup
1910 [ # # ]: 0 : pnode->CloseSocketDisconnect();
1911 : :
1912 : : // update connection count by network
1913 [ # # # # ]: 0 : if (pnode->IsManualOrFullOutboundConn()) --m_network_conn_counts[pnode->addr.GetNetwork()];
1914 : :
1915 : : // hold in disconnected pool until all refs are released
1916 [ # # ]: 0 : pnode->Release();
1917 [ # # ]: 0 : m_nodes_disconnected.push_back(pnode);
1918 : : }
1919 : : }
1920 [ # # ]: 0 : }
1921 : 0 : {
1922 : : // Delete disconnected nodes
1923 [ # # ]: 0 : std::list<CNode*> nodes_disconnected_copy = m_nodes_disconnected;
1924 [ # # ]: 0 : for (CNode* pnode : nodes_disconnected_copy)
1925 : : {
1926 : : // Destroy the object only after other threads have stopped using it.
1927 [ # # ]: 0 : if (pnode->GetRefCount() <= 0) {
1928 : 0 : m_nodes_disconnected.remove(pnode);
1929 [ # # ]: 0 : DeleteNode(pnode);
1930 : : }
1931 : : }
1932 : 0 : }
1933 : 0 : {
1934 : : // Move entries from reconnections_to_add to m_reconnections.
1935 [ # # ]: 0 : LOCK(m_reconnections_mutex);
1936 [ # # ]: 0 : m_reconnections.splice(m_reconnections.end(), std::move(reconnections_to_add));
1937 : 0 : }
1938 [ # # # # : 0 : }
# # ]
1939 : :
1940 : 0 : void CConnman::NotifyNumConnectionsChanged()
1941 : : {
1942 : 0 : size_t nodes_size;
1943 : 0 : {
1944 : 0 : LOCK(m_nodes_mutex);
1945 [ # # ]: 0 : nodes_size = m_nodes.size();
1946 : 0 : }
1947 [ # # ]: 0 : if(nodes_size != nPrevNodeCount) {
1948 : 0 : nPrevNodeCount = nodes_size;
1949 [ # # ]: 0 : if (m_client_interface) {
1950 : 0 : m_client_interface->NotifyNumConnectionsChanged(nodes_size);
1951 : : }
1952 : : }
1953 : 0 : }
1954 : :
1955 : 0 : bool CConnman::ShouldRunInactivityChecks(const CNode& node, std::chrono::seconds now) const
1956 : : {
1957 : 0 : return node.m_connected + m_peer_connect_timeout < now;
1958 : : }
1959 : :
1960 : 0 : bool CConnman::InactivityCheck(const CNode& node) const
1961 : : {
1962 : : // Tests that see disconnects after using mocktime can start nodes with a
1963 : : // large timeout. For example, -peertimeout=999999999.
1964 : 0 : const auto now{GetTime<std::chrono::seconds>()};
1965 : 0 : const auto last_send{node.m_last_send.load()};
1966 : 0 : const auto last_recv{node.m_last_recv.load()};
1967 : :
1968 [ # # ]: 0 : if (!ShouldRunInactivityChecks(node, now)) return false;
1969 : :
1970 [ # # # # ]: 0 : if (last_recv.count() == 0 || last_send.count() == 0) {
1971 [ # # ]: 0 : LogDebug(BCLog::NET, "socket no message in first %i seconds, %d %d peer=%d\n", count_seconds(m_peer_connect_timeout), last_recv.count() != 0, last_send.count() != 0, node.GetId());
1972 : 0 : return true;
1973 : : }
1974 : :
1975 [ # # ]: 0 : if (now > last_send + TIMEOUT_INTERVAL) {
1976 [ # # ]: 0 : LogDebug(BCLog::NET, "socket sending timeout: %is peer=%d\n", count_seconds(now - last_send), node.GetId());
1977 : 0 : return true;
1978 : : }
1979 : :
1980 [ # # ]: 0 : if (now > last_recv + TIMEOUT_INTERVAL) {
1981 [ # # ]: 0 : LogDebug(BCLog::NET, "socket receive timeout: %is peer=%d\n", count_seconds(now - last_recv), node.GetId());
1982 : 0 : return true;
1983 : : }
1984 : :
1985 [ # # ]: 0 : if (!node.fSuccessfullyConnected) {
1986 [ # # ]: 0 : if (node.m_transport->GetInfo().transport_type == TransportProtocolType::DETECTING) {
1987 [ # # ]: 0 : LogDebug(BCLog::NET, "V2 handshake timeout peer=%d\n", node.GetId());
1988 : : } else {
1989 [ # # ]: 0 : LogDebug(BCLog::NET, "version handshake timeout peer=%d\n", node.GetId());
1990 : : }
1991 : 0 : return true;
1992 : : }
1993 : :
1994 : : return false;
1995 : : }
1996 : :
1997 : 0 : Sock::EventsPerSock CConnman::GenerateWaitSockets(Span<CNode* const> nodes)
1998 : : {
1999 : 0 : Sock::EventsPerSock events_per_sock;
2000 : :
2001 [ # # ]: 0 : for (const ListenSocket& hListenSocket : vhListenSocket) {
2002 [ # # ]: 0 : events_per_sock.emplace(hListenSocket.sock, Sock::Events{Sock::RECV});
2003 : : }
2004 : :
2005 [ # # ]: 0 : for (CNode* pnode : nodes) {
2006 [ # # ]: 0 : bool select_recv = !pnode->fPauseRecv;
2007 : 0 : bool select_send;
2008 : 0 : {
2009 [ # # ]: 0 : LOCK(pnode->cs_vSend);
2010 : : // Sending is possible if either there are bytes to send right now, or if there will be
2011 : : // once a potential message from vSendMsg is handed to the transport. GetBytesToSend
2012 : : // determines both of these in a single call.
2013 [ # # ]: 0 : const auto& [to_send, more, _msg_type] = pnode->m_transport->GetBytesToSend(!pnode->vSendMsg.empty());
2014 [ # # # # : 0 : select_send = !to_send.empty() || more;
# # ]
2015 : 0 : }
2016 [ # # ]: 0 : if (!select_recv && !select_send) continue;
2017 : :
2018 [ # # ]: 0 : LOCK(pnode->m_sock_mutex);
2019 [ # # ]: 0 : if (pnode->m_sock) {
2020 [ # # # # ]: 0 : Sock::Event event = (select_send ? Sock::SEND : 0) | (select_recv ? Sock::RECV : 0);
2021 [ # # ]: 0 : events_per_sock.emplace(pnode->m_sock, Sock::Events{event});
2022 : : }
2023 : 0 : }
2024 : :
2025 : 0 : return events_per_sock;
2026 : 0 : }
2027 : :
2028 : 0 : void CConnman::SocketHandler()
2029 : : {
2030 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2031 : :
2032 [ # # ]: 0 : Sock::EventsPerSock events_per_sock;
2033 : :
2034 : 0 : {
2035 [ # # ]: 0 : const NodesSnapshot snap{*this, /*shuffle=*/false};
2036 : :
2037 : 0 : const auto timeout = std::chrono::milliseconds(SELECT_TIMEOUT_MILLISECONDS);
2038 : :
2039 : : // Check for the readiness of the already connected sockets and the
2040 : : // listening sockets in one call ("readiness" as in poll(2) or
2041 : : // select(2)). If none are ready, wait for a short while and return
2042 : : // empty sets.
2043 [ # # ]: 0 : events_per_sock = GenerateWaitSockets(snap.Nodes());
2044 [ # # # # : 0 : if (events_per_sock.empty() || !events_per_sock.begin()->first->WaitMany(timeout, events_per_sock)) {
# # ]
2045 [ # # ]: 0 : interruptNet.sleep_for(timeout);
2046 : : }
2047 : :
2048 : : // Service (send/receive) each of the already connected nodes.
2049 [ # # ]: 0 : SocketHandlerConnected(snap.Nodes(), events_per_sock);
2050 : 0 : }
2051 : :
2052 : : // Accept new connections from listening sockets.
2053 [ # # ]: 0 : SocketHandlerListening(events_per_sock);
2054 : 0 : }
2055 : :
2056 : 0 : void CConnman::SocketHandlerConnected(const std::vector<CNode*>& nodes,
2057 : : const Sock::EventsPerSock& events_per_sock)
2058 : : {
2059 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2060 : :
2061 [ # # ]: 0 : for (CNode* pnode : nodes) {
2062 [ # # ]: 0 : if (interruptNet)
2063 : : return;
2064 : :
2065 : : //
2066 : : // Receive
2067 : : //
2068 : 0 : bool recvSet = false;
2069 : 0 : bool sendSet = false;
2070 : 0 : bool errorSet = false;
2071 : 0 : {
2072 : 0 : LOCK(pnode->m_sock_mutex);
2073 [ # # ]: 0 : if (!pnode->m_sock) {
2074 [ # # ]: 0 : continue;
2075 : : }
2076 [ # # # # ]: 0 : const auto it = events_per_sock.find(pnode->m_sock);
2077 [ # # ]: 0 : if (it != events_per_sock.end()) {
2078 : 0 : recvSet = it->second.occurred & Sock::RECV;
2079 : 0 : sendSet = it->second.occurred & Sock::SEND;
2080 : 0 : errorSet = it->second.occurred & Sock::ERR;
2081 : : }
2082 : 0 : }
2083 : :
2084 [ # # ]: 0 : if (sendSet) {
2085 : : // Send data
2086 [ # # # # ]: 0 : auto [bytes_sent, data_left] = WITH_LOCK(pnode->cs_vSend, return SocketSendData(*pnode));
2087 [ # # ]: 0 : if (bytes_sent) {
2088 : 0 : RecordBytesSent(bytes_sent);
2089 : :
2090 : : // If both receiving and (non-optimistic) sending were possible, we first attempt
2091 : : // sending. If that succeeds, but does not fully drain the send queue, do not
2092 : : // attempt to receive. This avoids needlessly queueing data if the remote peer
2093 : : // is slow at receiving data, by means of TCP flow control. We only do this when
2094 : : // sending actually succeeded to make sure progress is always made; otherwise a
2095 : : // deadlock would be possible when both sides have data to send, but neither is
2096 : : // receiving.
2097 [ # # ]: 0 : if (data_left) recvSet = false;
2098 : : }
2099 : : }
2100 : :
2101 [ # # ]: 0 : if (recvSet || errorSet)
2102 : : {
2103 : : // typical socket buffer is 8K-64K
2104 : 0 : uint8_t pchBuf[0x10000];
2105 : 0 : int nBytes = 0;
2106 : 0 : {
2107 : 0 : LOCK(pnode->m_sock_mutex);
2108 [ # # ]: 0 : if (!pnode->m_sock) {
2109 [ # # ]: 0 : continue;
2110 : : }
2111 [ # # # # ]: 0 : nBytes = pnode->m_sock->Recv(pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
2112 : 0 : }
2113 [ # # ]: 0 : if (nBytes > 0)
2114 : : {
2115 : 0 : bool notify = false;
2116 [ # # ]: 0 : if (!pnode->ReceiveMsgBytes({pchBuf, (size_t)nBytes}, notify)) {
2117 : 0 : pnode->CloseSocketDisconnect();
2118 : : }
2119 : 0 : RecordBytesRecv(nBytes);
2120 [ # # ]: 0 : if (notify) {
2121 : 0 : pnode->MarkReceivedMsgsForProcessing();
2122 : 0 : WakeMessageHandler();
2123 : : }
2124 : : }
2125 [ # # ]: 0 : else if (nBytes == 0)
2126 : : {
2127 : : // socket closed gracefully
2128 [ # # ]: 0 : if (!pnode->fDisconnect) {
2129 [ # # ]: 0 : LogDebug(BCLog::NET, "socket closed for peer=%d\n", pnode->GetId());
2130 : : }
2131 : 0 : pnode->CloseSocketDisconnect();
2132 : : }
2133 [ # # ]: 0 : else if (nBytes < 0)
2134 : : {
2135 : : // error
2136 : 0 : int nErr = WSAGetLastError();
2137 [ # # # # ]: 0 : if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
2138 : : {
2139 [ # # ]: 0 : if (!pnode->fDisconnect) {
2140 [ # # # # ]: 0 : LogDebug(BCLog::NET, "socket recv error for peer=%d: %s\n", pnode->GetId(), NetworkErrorString(nErr));
2141 : : }
2142 : 0 : pnode->CloseSocketDisconnect();
2143 : : }
2144 : : }
2145 : : }
2146 : :
2147 [ # # ]: 0 : if (InactivityCheck(*pnode)) pnode->fDisconnect = true;
2148 : : }
2149 : : }
2150 : :
2151 : 0 : void CConnman::SocketHandlerListening(const Sock::EventsPerSock& events_per_sock)
2152 : : {
2153 [ # # ]: 0 : for (const ListenSocket& listen_socket : vhListenSocket) {
2154 [ # # ]: 0 : if (interruptNet) {
2155 : : return;
2156 : : }
2157 [ # # # # ]: 0 : const auto it = events_per_sock.find(listen_socket.sock);
2158 [ # # # # ]: 0 : if (it != events_per_sock.end() && it->second.occurred & Sock::RECV) {
2159 : 0 : AcceptConnection(listen_socket);
2160 : : }
2161 : : }
2162 : : }
2163 : :
2164 : 0 : void CConnman::ThreadSocketHandler()
2165 : : {
2166 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2167 : :
2168 [ # # ]: 0 : while (!interruptNet)
2169 : : {
2170 : 0 : DisconnectNodes();
2171 : 0 : NotifyNumConnectionsChanged();
2172 : 0 : SocketHandler();
2173 : : }
2174 : 0 : }
2175 : :
2176 : 0 : void CConnman::WakeMessageHandler()
2177 : : {
2178 : 0 : {
2179 : 0 : LOCK(mutexMsgProc);
2180 [ # # ]: 0 : fMsgProcWake = true;
2181 : 0 : }
2182 : 0 : condMsgProc.notify_one();
2183 : 0 : }
2184 : :
2185 : 0 : void CConnman::ThreadDNSAddressSeed()
2186 : : {
2187 : 0 : int outbound_connection_count = 0;
2188 : :
2189 [ # # # # ]: 0 : if (gArgs.IsArgSet("-seednode")) {
2190 : 0 : auto start = NodeClock::now();
2191 : 0 : constexpr std::chrono::seconds SEEDNODE_TIMEOUT = 30s;
2192 : 0 : LogPrintf("-seednode enabled. Trying the provided seeds for %d seconds before defaulting to the dnsseeds.\n", SEEDNODE_TIMEOUT.count());
2193 [ # # ]: 0 : while (!interruptNet) {
2194 [ # # ]: 0 : if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
2195 : : return;
2196 : :
2197 : : // Abort if we have spent enough time without reaching our target.
2198 : : // Giving seed nodes 30 seconds so this does not become a race against fixedseeds (which triggers after 1 min)
2199 [ # # ]: 0 : if (NodeClock::now() > start + SEEDNODE_TIMEOUT) {
2200 : 0 : LogPrintf("Couldn't connect to enough peers via seed nodes. Handing fetch logic to the DNS seeds.\n");
2201 : 0 : break;
2202 : : }
2203 : :
2204 : 0 : outbound_connection_count = GetFullOutboundConnCount();
2205 [ # # ]: 0 : if (outbound_connection_count >= SEED_OUTBOUND_CONNECTION_THRESHOLD) {
2206 : 0 : LogPrintf("P2P peers available. Finished fetching data from seed nodes.\n");
2207 : 0 : break;
2208 : : }
2209 : : }
2210 : : }
2211 : :
2212 : 0 : FastRandomContext rng;
2213 [ # # ]: 0 : std::vector<std::string> seeds = m_params.DNSSeeds();
2214 : 0 : std::shuffle(seeds.begin(), seeds.end(), rng);
2215 : 0 : int seeds_right_now = 0; // Number of seeds left before testing if we have enough connections
2216 : :
2217 [ # # # # : 0 : if (gArgs.GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED)) {
# # ]
2218 : : // When -forcednsseed is provided, query all.
2219 : 0 : seeds_right_now = seeds.size();
2220 [ # # # # ]: 0 : } else if (addrman.Size() == 0) {
2221 : : // If we have no known peers, query all.
2222 : : // This will occur on the first run, or if peers.dat has been
2223 : : // deleted.
2224 : 0 : seeds_right_now = seeds.size();
2225 : : }
2226 : :
2227 : : // Proceed with dnsseeds if seednodes hasn't reached the target or if forcednsseed is set
2228 [ # # ]: 0 : if (outbound_connection_count < SEED_OUTBOUND_CONNECTION_THRESHOLD || seeds_right_now) {
2229 : : // goal: only query DNS seed if address need is acute
2230 : : // * If we have a reasonable number of peers in addrman, spend
2231 : : // some time trying them first. This improves user privacy by
2232 : : // creating fewer identifying DNS requests, reduces trust by
2233 : : // giving seeds less influence on the network topology, and
2234 : : // reduces traffic to the seeds.
2235 : : // * When querying DNS seeds query a few at once, this ensures
2236 : : // that we don't give DNS seeds the ability to eclipse nodes
2237 : : // that query them.
2238 : : // * If we continue having problems, eventually query all the
2239 : : // DNS seeds, and if that fails too, also try the fixed seeds.
2240 : : // (done in ThreadOpenConnections)
2241 : 0 : int found = 0;
2242 [ # # # # ]: 0 : const std::chrono::seconds seeds_wait_time = (addrman.Size() >= DNSSEEDS_DELAY_PEER_THRESHOLD ? DNSSEEDS_DELAY_MANY_PEERS : DNSSEEDS_DELAY_FEW_PEERS);
2243 : :
2244 [ # # ]: 0 : for (const std::string& seed : seeds) {
2245 [ # # ]: 0 : if (seeds_right_now == 0) {
2246 : 0 : seeds_right_now += DNSSEEDS_TO_QUERY_AT_ONCE;
2247 : :
2248 [ # # # # ]: 0 : if (addrman.Size() > 0) {
2249 [ # # ]: 0 : LogPrintf("Waiting %d seconds before querying DNS seeds.\n", seeds_wait_time.count());
2250 : 0 : std::chrono::seconds to_wait = seeds_wait_time;
2251 [ # # ]: 0 : while (to_wait.count() > 0) {
2252 : : // if sleeping for the MANY_PEERS interval, wake up
2253 : : // early to see if we have enough peers and can stop
2254 : : // this thread entirely freeing up its resources
2255 : 0 : std::chrono::seconds w = std::min(DNSSEEDS_DELAY_FEW_PEERS, to_wait);
2256 [ # # # # ]: 0 : if (!interruptNet.sleep_for(w)) return;
2257 [ # # ]: 0 : to_wait -= w;
2258 : :
2259 [ # # # # ]: 0 : if (GetFullOutboundConnCount() >= SEED_OUTBOUND_CONNECTION_THRESHOLD) {
2260 [ # # ]: 0 : if (found > 0) {
2261 [ # # ]: 0 : LogPrintf("%d addresses found from DNS seeds\n", found);
2262 [ # # ]: 0 : LogPrintf("P2P peers available. Finished DNS seeding.\n");
2263 : : } else {
2264 [ # # ]: 0 : LogPrintf("P2P peers available. Skipped DNS seeding.\n");
2265 : : }
2266 : 0 : return;
2267 : : }
2268 : : }
2269 : : }
2270 : : }
2271 : :
2272 [ # # # # ]: 0 : if (interruptNet) return;
2273 : :
2274 : : // hold off on querying seeds if P2P network deactivated
2275 [ # # ]: 0 : if (!fNetworkActive) {
2276 [ # # ]: 0 : LogPrintf("Waiting for network to be reactivated before querying DNS seeds.\n");
2277 : 0 : do {
2278 [ # # # # ]: 0 : if (!interruptNet.sleep_for(std::chrono::seconds{1})) return;
2279 [ # # ]: 0 : } while (!fNetworkActive);
2280 : : }
2281 : :
2282 [ # # ]: 0 : LogPrintf("Loading addresses from DNS seed %s\n", seed);
2283 : : // If -proxy is in use, we make an ADDR_FETCH connection to the DNS resolved peer address
2284 : : // for the base dns seed domain in chainparams
2285 [ # # # # ]: 0 : if (HaveNameProxy()) {
2286 [ # # ]: 0 : AddAddrFetch(seed);
2287 : : } else {
2288 : 0 : std::vector<CAddress> vAdd;
2289 : 0 : constexpr ServiceFlags requiredServiceBits{SeedsServiceFlags()};
2290 [ # # ]: 0 : std::string host = strprintf("x%x.%s", requiredServiceBits, seed);
2291 [ # # ]: 0 : CNetAddr resolveSource;
2292 [ # # # # ]: 0 : if (!resolveSource.SetInternal(host)) {
2293 : 0 : continue;
2294 : : }
2295 : : // Limit number of IPs learned from a single DNS seed. This limit exists to prevent the results from
2296 : : // one DNS seed from dominating AddrMan. Note that the number of results from a UDP DNS query is
2297 : : // bounded to 33 already, but it is possible for it to use TCP where a larger number of results can be
2298 : : // returned.
2299 : 0 : unsigned int nMaxIPs = 32;
2300 [ # # # # ]: 0 : const auto addresses{LookupHost(host, nMaxIPs, true)};
2301 [ # # ]: 0 : if (!addresses.empty()) {
2302 [ # # ]: 0 : for (const CNetAddr& ip : addresses) {
2303 [ # # ]: 0 : CAddress addr = CAddress(CService(ip, m_params.GetDefaultPort()), requiredServiceBits);
2304 : 0 : addr.nTime = rng.rand_uniform_delay(Now<NodeSeconds>() - 3 * 24h, -4 * 24h); // use a random age between 3 and 7 days old
2305 [ # # ]: 0 : vAdd.push_back(addr);
2306 : 0 : found++;
2307 : 0 : }
2308 [ # # ]: 0 : addrman.Add(vAdd, resolveSource);
2309 : : } else {
2310 : : // If the seed does not support a subdomain with our desired service bits,
2311 : : // we make an ADDR_FETCH connection to the DNS resolved peer address for the
2312 : : // base dns seed domain in chainparams
2313 [ # # ]: 0 : AddAddrFetch(seed);
2314 : : }
2315 : 0 : }
2316 : 0 : --seeds_right_now;
2317 : : }
2318 [ # # ]: 0 : LogPrintf("%d addresses found from DNS seeds\n", found);
2319 : : } else {
2320 [ # # ]: 0 : LogPrintf("Skipping DNS seeds. Enough peers have been found\n");
2321 : : }
2322 : 0 : }
2323 : :
2324 : 0 : void CConnman::DumpAddresses()
2325 : : {
2326 : 0 : const auto start{SteadyClock::now()};
2327 : :
2328 : 0 : DumpPeerAddresses(::gArgs, addrman);
2329 : :
2330 [ # # ]: 0 : LogDebug(BCLog::NET, "Flushed %d addresses to peers.dat %dms\n",
2331 : : addrman.Size(), Ticks<std::chrono::milliseconds>(SteadyClock::now() - start));
2332 : 0 : }
2333 : :
2334 : 0 : void CConnman::ProcessAddrFetch()
2335 : : {
2336 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2337 [ # # ]: 0 : std::string strDest;
2338 : 0 : {
2339 [ # # ]: 0 : LOCK(m_addr_fetches_mutex);
2340 [ # # ]: 0 : if (m_addr_fetches.empty())
2341 [ # # ]: 0 : return;
2342 [ # # ]: 0 : strDest = m_addr_fetches.front();
2343 [ # # ]: 0 : m_addr_fetches.pop_front();
2344 : 0 : }
2345 : : // Attempt v2 connection if we support v2 - we'll reconnect with v1 if our
2346 : : // peer doesn't support it or immediately disconnects us for another reason.
2347 [ # # ]: 0 : const bool use_v2transport(GetLocalServices() & NODE_P2P_V2);
2348 [ # # ]: 0 : CAddress addr;
2349 : 0 : CSemaphoreGrant grant(*semOutbound, /*fTry=*/true);
2350 [ # # ]: 0 : if (grant) {
2351 [ # # ]: 0 : OpenNetworkConnection(addr, false, std::move(grant), strDest.c_str(), ConnectionType::ADDR_FETCH, use_v2transport);
2352 : : }
2353 : 0 : }
2354 : :
2355 : 0 : bool CConnman::GetTryNewOutboundPeer() const
2356 : : {
2357 : 0 : return m_try_another_outbound_peer;
2358 : : }
2359 : :
2360 : 0 : void CConnman::SetTryNewOutboundPeer(bool flag)
2361 : : {
2362 : 0 : m_try_another_outbound_peer = flag;
2363 [ # # # # ]: 0 : LogDebug(BCLog::NET, "setting try another outbound peer=%s\n", flag ? "true" : "false");
2364 : 0 : }
2365 : :
2366 : 0 : void CConnman::StartExtraBlockRelayPeers()
2367 : : {
2368 [ # # ]: 0 : LogDebug(BCLog::NET, "enabling extra block-relay-only peers\n");
2369 : 0 : m_start_extra_block_relay_peers = true;
2370 : 0 : }
2371 : :
2372 : : // Return the number of outbound connections that are full relay (not blocks only)
2373 : 0 : int CConnman::GetFullOutboundConnCount() const
2374 : : {
2375 : 0 : int nRelevant = 0;
2376 : 0 : {
2377 : 0 : LOCK(m_nodes_mutex);
2378 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
2379 [ # # # # ]: 0 : if (pnode->fSuccessfullyConnected && pnode->IsFullOutboundConn()) ++nRelevant;
2380 : : }
2381 : 0 : }
2382 : 0 : return nRelevant;
2383 : : }
2384 : :
2385 : : // Return the number of peers we have over our outbound connection limit
2386 : : // Exclude peers that are marked for disconnect, or are going to be
2387 : : // disconnected soon (eg ADDR_FETCH and FEELER)
2388 : : // Also exclude peers that haven't finished initial connection handshake yet
2389 : : // (so that we don't decide we're over our desired connection limit, and then
2390 : : // evict some peer that has finished the handshake)
2391 : 0 : int CConnman::GetExtraFullOutboundCount() const
2392 : : {
2393 : 0 : int full_outbound_peers = 0;
2394 : 0 : {
2395 : 0 : LOCK(m_nodes_mutex);
2396 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
2397 [ # # # # : 0 : if (pnode->fSuccessfullyConnected && !pnode->fDisconnect && pnode->IsFullOutboundConn()) {
# # ]
2398 : 0 : ++full_outbound_peers;
2399 : : }
2400 : : }
2401 : 0 : }
2402 [ # # ]: 0 : return std::max(full_outbound_peers - m_max_outbound_full_relay, 0);
2403 : : }
2404 : :
2405 : 0 : int CConnman::GetExtraBlockRelayCount() const
2406 : : {
2407 : 0 : int block_relay_peers = 0;
2408 : 0 : {
2409 : 0 : LOCK(m_nodes_mutex);
2410 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
2411 [ # # # # : 0 : if (pnode->fSuccessfullyConnected && !pnode->fDisconnect && pnode->IsBlockOnlyConn()) {
# # ]
2412 : 0 : ++block_relay_peers;
2413 : : }
2414 : : }
2415 : 0 : }
2416 [ # # ]: 0 : return std::max(block_relay_peers - m_max_outbound_block_relay, 0);
2417 : : }
2418 : :
2419 : 0 : std::unordered_set<Network> CConnman::GetReachableEmptyNetworks() const
2420 : : {
2421 : 0 : std::unordered_set<Network> networks{};
2422 [ # # ]: 0 : for (int n = 0; n < NET_MAX; n++) {
2423 : 0 : enum Network net = (enum Network)n;
2424 [ # # ]: 0 : if (net == NET_UNROUTABLE || net == NET_INTERNAL) continue;
2425 [ # # # # : 0 : if (g_reachable_nets.Contains(net) && addrman.Size(net, std::nullopt) == 0) {
# # # # ]
2426 [ # # ]: 0 : networks.insert(net);
2427 : : }
2428 : : }
2429 : 0 : return networks;
2430 : 0 : }
2431 : :
2432 : 0 : bool CConnman::MultipleManualOrFullOutboundConns(Network net) const
2433 : : {
2434 : 0 : AssertLockHeld(m_nodes_mutex);
2435 : 0 : return m_network_conn_counts[net] > 1;
2436 : : }
2437 : :
2438 : 0 : bool CConnman::MaybePickPreferredNetwork(std::optional<Network>& network)
2439 : : {
2440 : 0 : std::array<Network, 5> nets{NET_IPV4, NET_IPV6, NET_ONION, NET_I2P, NET_CJDNS};
2441 : 0 : std::shuffle(nets.begin(), nets.end(), FastRandomContext());
2442 : :
2443 : 0 : LOCK(m_nodes_mutex);
2444 [ # # ]: 0 : for (const auto net : nets) {
2445 [ # # # # : 0 : if (g_reachable_nets.Contains(net) && m_network_conn_counts[net] == 0 && addrman.Size(net) != 0) {
# # # # #
# ]
2446 : 0 : network = net;
2447 : 0 : return true;
2448 : : }
2449 : : }
2450 : :
2451 : : return false;
2452 : 0 : }
2453 : :
2454 : 0 : void CConnman::ThreadOpenConnections(const std::vector<std::string> connect, Span<const std::string> seed_nodes)
2455 : : {
2456 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2457 : 0 : AssertLockNotHeld(m_reconnections_mutex);
2458 : 0 : FastRandomContext rng;
2459 : : // Connect to specific addresses
2460 [ # # ]: 0 : if (!connect.empty())
2461 : : {
2462 : : // Attempt v2 connection if we support v2 - we'll reconnect with v1 if our
2463 : : // peer doesn't support it or immediately disconnects us for another reason.
2464 [ # # ]: 0 : const bool use_v2transport(GetLocalServices() & NODE_P2P_V2);
2465 : 0 : for (int64_t nLoop = 0;; nLoop++)
2466 : : {
2467 [ # # ]: 0 : for (const std::string& strAddr : connect)
2468 : : {
2469 [ # # ]: 0 : CAddress addr(CService(), NODE_NONE);
2470 [ # # ]: 0 : OpenNetworkConnection(addr, false, {}, strAddr.c_str(), ConnectionType::MANUAL, /*use_v2transport=*/use_v2transport);
2471 [ # # # # ]: 0 : for (int i = 0; i < 10 && i < nLoop; i++)
2472 : : {
2473 [ # # # # ]: 0 : if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
2474 : 0 : return;
2475 : : }
2476 : 0 : }
2477 [ # # # # ]: 0 : if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
2478 : : return;
2479 [ # # ]: 0 : PerformReconnections();
2480 : 0 : }
2481 : : }
2482 : :
2483 : : // Initiate network connections
2484 : 0 : auto start = GetTime<std::chrono::microseconds>();
2485 : :
2486 : : // Minimum time before next feeler connection (in microseconds).
2487 : 0 : auto next_feeler = start + rng.rand_exp_duration(FEELER_INTERVAL);
2488 : 0 : auto next_extra_block_relay = start + rng.rand_exp_duration(EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL);
2489 [ # # ]: 0 : auto next_extra_network_peer{start + rng.rand_exp_duration(EXTRA_NETWORK_PEER_INTERVAL)};
2490 [ # # # # ]: 0 : const bool dnsseed = gArgs.GetBoolArg("-dnsseed", DEFAULT_DNSSEED);
2491 [ # # # # ]: 0 : bool add_fixed_seeds = gArgs.GetBoolArg("-fixedseeds", DEFAULT_FIXEDSEEDS);
2492 [ # # # # ]: 0 : const bool use_seednodes{gArgs.IsArgSet("-seednode")};
2493 : :
2494 : 0 : auto seed_node_timer = NodeClock::now();
2495 [ # # # # : 0 : bool add_addr_fetch{addrman.Size() == 0 && !seed_nodes.empty()};
# # ]
2496 : 0 : constexpr std::chrono::seconds ADD_NEXT_SEEDNODE = 10s;
2497 : :
2498 [ # # ]: 0 : if (!add_fixed_seeds) {
2499 [ # # ]: 0 : LogPrintf("Fixed seeds are disabled\n");
2500 : : }
2501 : :
2502 [ # # # # ]: 0 : while (!interruptNet)
2503 : : {
2504 [ # # ]: 0 : if (add_addr_fetch) {
2505 : 0 : add_addr_fetch = false;
2506 : 0 : const auto& seed{SpanPopBack(seed_nodes)};
2507 [ # # ]: 0 : AddAddrFetch(seed);
2508 : :
2509 [ # # # # ]: 0 : if (addrman.Size() == 0) {
2510 [ # # ]: 0 : LogInfo("Empty addrman, adding seednode (%s) to addrfetch\n", seed);
2511 : : } else {
2512 [ # # ]: 0 : LogInfo("Couldn't connect to peers from addrman after %d seconds. Adding seednode (%s) to addrfetch\n", ADD_NEXT_SEEDNODE.count(), seed);
2513 : : }
2514 : : }
2515 : :
2516 [ # # ]: 0 : ProcessAddrFetch();
2517 : :
2518 [ # # # # ]: 0 : if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
2519 : : return;
2520 : :
2521 [ # # ]: 0 : PerformReconnections();
2522 : :
2523 : 0 : CSemaphoreGrant grant(*semOutbound);
2524 [ # # # # ]: 0 : if (interruptNet)
2525 : : return;
2526 : :
2527 [ # # ]: 0 : const std::unordered_set<Network> fixed_seed_networks{GetReachableEmptyNetworks()};
2528 [ # # # # ]: 0 : if (add_fixed_seeds && !fixed_seed_networks.empty()) {
2529 : : // When the node starts with an empty peers.dat, there are a few other sources of peers before
2530 : : // we fallback on to fixed seeds: -dnsseed, -seednode, -addnode
2531 : : // If none of those are available, we fallback on to fixed seeds immediately, else we allow
2532 : : // 60 seconds for any of those sources to populate addrman.
2533 : 0 : bool add_fixed_seeds_now = false;
2534 : : // It is cheapest to check if enough time has passed first.
2535 [ # # ]: 0 : if (GetTime<std::chrono::seconds>() > start + std::chrono::minutes{1}) {
2536 : 0 : add_fixed_seeds_now = true;
2537 [ # # ]: 0 : LogPrintf("Adding fixed seeds as 60 seconds have passed and addrman is empty for at least one reachable network\n");
2538 : : }
2539 : :
2540 : : // Perform cheap checks before locking a mutex.
2541 [ # # ]: 0 : else if (!dnsseed && !use_seednodes) {
2542 [ # # ]: 0 : LOCK(m_added_nodes_mutex);
2543 [ # # ]: 0 : if (m_added_node_params.empty()) {
2544 : 0 : add_fixed_seeds_now = true;
2545 [ # # ]: 0 : LogPrintf("Adding fixed seeds as -dnsseed=0 (or IPv4/IPv6 connections are disabled via -onlynet) and neither -addnode nor -seednode are provided\n");
2546 : : }
2547 : 0 : }
2548 : :
2549 [ # # ]: 0 : if (add_fixed_seeds_now) {
2550 [ # # ]: 0 : std::vector<CAddress> seed_addrs{ConvertSeeds(m_params.FixedSeeds())};
2551 : : // We will not make outgoing connections to peers that are unreachable
2552 : : // (e.g. because of -onlynet configuration).
2553 : : // Therefore, we do not add them to addrman in the first place.
2554 : : // In case previously unreachable networks become reachable
2555 : : // (e.g. in case of -onlynet changes by the user), fixed seeds will
2556 : : // be loaded only for networks for which we have no addresses.
2557 [ # # ]: 0 : seed_addrs.erase(std::remove_if(seed_addrs.begin(), seed_addrs.end(),
2558 : 0 : [&fixed_seed_networks](const CAddress& addr) { return fixed_seed_networks.count(addr.GetNetwork()) == 0; }),
2559 [ # # ]: 0 : seed_addrs.end());
2560 [ # # ]: 0 : CNetAddr local;
2561 [ # # # # ]: 0 : local.SetInternal("fixedseeds");
2562 [ # # ]: 0 : addrman.Add(seed_addrs, local);
2563 : 0 : add_fixed_seeds = false;
2564 [ # # ]: 0 : LogPrintf("Added %d fixed seeds from reachable networks.\n", seed_addrs.size());
2565 : 0 : }
2566 : : }
2567 : :
2568 : : //
2569 : : // Choose an address to connect to based on most recently seen
2570 : : //
2571 [ # # ]: 0 : CAddress addrConnect;
2572 : :
2573 : : // Only connect out to one peer per ipv4/ipv6 network group (/16 for IPv4).
2574 : 0 : int nOutboundFullRelay = 0;
2575 : 0 : int nOutboundBlockRelay = 0;
2576 : 0 : int outbound_privacy_network_peers = 0;
2577 [ # # ]: 0 : std::set<std::vector<unsigned char>> outbound_ipv46_peer_netgroups;
2578 : :
2579 : 0 : {
2580 [ # # ]: 0 : LOCK(m_nodes_mutex);
2581 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
2582 [ # # ]: 0 : if (pnode->IsFullOutboundConn()) nOutboundFullRelay++;
2583 [ # # ]: 0 : if (pnode->IsBlockOnlyConn()) nOutboundBlockRelay++;
2584 : :
2585 : : // Make sure our persistent outbound slots to ipv4/ipv6 peers belong to different netgroups.
2586 [ # # ]: 0 : switch (pnode->m_conn_type) {
2587 : : // We currently don't take inbound connections into account. Since they are
2588 : : // free to make, an attacker could make them to prevent us from connecting to
2589 : : // certain peers.
2590 : : case ConnectionType::INBOUND:
2591 : : // Short-lived outbound connections should not affect how we select outbound
2592 : : // peers from addrman.
2593 : : case ConnectionType::ADDR_FETCH:
2594 : : case ConnectionType::FEELER:
2595 : : break;
2596 : 0 : case ConnectionType::MANUAL:
2597 : 0 : case ConnectionType::OUTBOUND_FULL_RELAY:
2598 : 0 : case ConnectionType::BLOCK_RELAY:
2599 : 0 : const CAddress address{pnode->addr};
2600 [ # # # # : 0 : if (address.IsTor() || address.IsI2P() || address.IsCJDNS()) {
# # ]
2601 : : // Since our addrman-groups for these networks are
2602 : : // random, without relation to the route we
2603 : : // take to connect to these peers or to the
2604 : : // difficulty in obtaining addresses with diverse
2605 : : // groups, we don't worry about diversity with
2606 : : // respect to our addrman groups when connecting to
2607 : : // these networks.
2608 : 0 : ++outbound_privacy_network_peers;
2609 : : } else {
2610 [ # # # # ]: 0 : outbound_ipv46_peer_netgroups.insert(m_netgroupman.GetGroup(address));
2611 : : }
2612 : : } // no default case, so the compiler can warn about missing cases
2613 : : }
2614 : 0 : }
2615 : :
2616 [ # # # # ]: 0 : if (!seed_nodes.empty() && nOutboundFullRelay < SEED_OUTBOUND_CONNECTION_THRESHOLD) {
2617 [ # # ]: 0 : if (NodeClock::now() > seed_node_timer + ADD_NEXT_SEEDNODE) {
2618 : 0 : seed_node_timer = NodeClock::now();
2619 : 0 : add_addr_fetch = true;
2620 : : }
2621 : : }
2622 : :
2623 : 0 : ConnectionType conn_type = ConnectionType::OUTBOUND_FULL_RELAY;
2624 : 0 : auto now = GetTime<std::chrono::microseconds>();
2625 : 0 : bool anchor = false;
2626 : 0 : bool fFeeler = false;
2627 : 0 : std::optional<Network> preferred_net;
2628 : :
2629 : : // Determine what type of connection to open. Opening
2630 : : // BLOCK_RELAY connections to addresses from anchors.dat gets the highest
2631 : : // priority. Then we open OUTBOUND_FULL_RELAY priority until we
2632 : : // meet our full-relay capacity. Then we open BLOCK_RELAY connection
2633 : : // until we hit our block-relay-only peer limit.
2634 : : // GetTryNewOutboundPeer() gets set when a stale tip is detected, so we
2635 : : // try opening an additional OUTBOUND_FULL_RELAY connection. If none of
2636 : : // these conditions are met, check to see if it's time to try an extra
2637 : : // block-relay-only peer (to confirm our tip is current, see below) or the next_feeler
2638 : : // timer to decide if we should open a FEELER.
2639 : :
2640 [ # # # # ]: 0 : if (!m_anchors.empty() && (nOutboundBlockRelay < m_max_outbound_block_relay)) {
2641 : : conn_type = ConnectionType::BLOCK_RELAY;
2642 : : anchor = true;
2643 [ # # ]: 0 : } else if (nOutboundFullRelay < m_max_outbound_full_relay) {
2644 : : // OUTBOUND_FULL_RELAY
2645 [ # # ]: 0 : } else if (nOutboundBlockRelay < m_max_outbound_block_relay) {
2646 : : conn_type = ConnectionType::BLOCK_RELAY;
2647 [ # # # # ]: 0 : } else if (GetTryNewOutboundPeer()) {
2648 : : // OUTBOUND_FULL_RELAY
2649 [ # # # # ]: 0 : } else if (now > next_extra_block_relay && m_start_extra_block_relay_peers) {
2650 : : // Periodically connect to a peer (using regular outbound selection
2651 : : // methodology from addrman) and stay connected long enough to sync
2652 : : // headers, but not much else.
2653 : : //
2654 : : // Then disconnect the peer, if we haven't learned anything new.
2655 : : //
2656 : : // The idea is to make eclipse attacks very difficult to pull off,
2657 : : // because every few minutes we're finding a new peer to learn headers
2658 : : // from.
2659 : : //
2660 : : // This is similar to the logic for trying extra outbound (full-relay)
2661 : : // peers, except:
2662 : : // - we do this all the time on an exponential timer, rather than just when
2663 : : // our tip is stale
2664 : : // - we potentially disconnect our next-youngest block-relay-only peer, if our
2665 : : // newest block-relay-only peer delivers a block more recently.
2666 : : // See the eviction logic in net_processing.cpp.
2667 : : //
2668 : : // Because we can promote these connections to block-relay-only
2669 : : // connections, they do not get their own ConnectionType enum
2670 : : // (similar to how we deal with extra outbound peers).
2671 : 0 : next_extra_block_relay = now + rng.rand_exp_duration(EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL);
2672 : 0 : conn_type = ConnectionType::BLOCK_RELAY;
2673 [ # # ]: 0 : } else if (now > next_feeler) {
2674 : 0 : next_feeler = now + rng.rand_exp_duration(FEELER_INTERVAL);
2675 : 0 : conn_type = ConnectionType::FEELER;
2676 : 0 : fFeeler = true;
2677 [ # # ]: 0 : } else if (nOutboundFullRelay == m_max_outbound_full_relay &&
2678 [ # # ]: 0 : m_max_outbound_full_relay == MAX_OUTBOUND_FULL_RELAY_CONNECTIONS &&
2679 [ # # # # : 0 : now > next_extra_network_peer &&
# # ]
2680 [ # # ]: 0 : MaybePickPreferredNetwork(preferred_net)) {
2681 : : // Full outbound connection management: Attempt to get at least one
2682 : : // outbound peer from each reachable network by making extra connections
2683 : : // and then protecting "only" peers from a network during outbound eviction.
2684 : : // This is not attempted if the user changed -maxconnections to a value
2685 : : // so low that less than MAX_OUTBOUND_FULL_RELAY_CONNECTIONS are made,
2686 : : // to prevent interactions with otherwise protected outbound peers.
2687 : 0 : next_extra_network_peer = now + rng.rand_exp_duration(EXTRA_NETWORK_PEER_INTERVAL);
2688 : : } else {
2689 : : // skip to next iteration of while loop
2690 : 0 : continue;
2691 : : }
2692 : :
2693 [ # # ]: 0 : addrman.ResolveCollisions();
2694 : :
2695 : 0 : const auto current_time{NodeClock::now()};
2696 : 0 : int nTries = 0;
2697 [ # # ]: 0 : const auto reachable_nets{g_reachable_nets.All()};
2698 : :
2699 [ # # # # ]: 0 : while (!interruptNet)
2700 : : {
2701 [ # # # # ]: 0 : if (anchor && !m_anchors.empty()) {
2702 : 0 : const CAddress addr = m_anchors.back();
2703 : 0 : m_anchors.pop_back();
2704 [ # # # # : 0 : if (!addr.IsValid() || IsLocal(addr) || !g_reachable_nets.Contains(addr) ||
# # # # #
# # # #
# ]
2705 [ # # # # : 0 : !m_msgproc->HasAllDesirableServiceFlags(addr.nServices) ||
# # ]
2706 [ # # ]: 0 : outbound_ipv46_peer_netgroups.count(m_netgroupman.GetGroup(addr))) continue;
2707 : 0 : addrConnect = addr;
2708 [ # # # # : 0 : LogDebug(BCLog::NET, "Trying to make an anchor connection to %s\n", addrConnect.ToStringAddrPort());
# # # # ]
2709 : 0 : break;
2710 : 0 : }
2711 : :
2712 : : // If we didn't find an appropriate destination after trying 100 addresses fetched from addrman,
2713 : : // stop this loop, and let the outer loop run again (which sleeps, adds seed nodes, recalculates
2714 : : // already-connected network ranges, ...) before trying new addrman addresses.
2715 : 0 : nTries++;
2716 [ # # ]: 0 : if (nTries > 100)
2717 : : break;
2718 : :
2719 [ # # ]: 0 : CAddress addr;
2720 : 0 : NodeSeconds addr_last_try{0s};
2721 : :
2722 [ # # ]: 0 : if (fFeeler) {
2723 : : // First, try to get a tried table collision address. This returns
2724 : : // an empty (invalid) address if there are no collisions to try.
2725 [ # # ]: 0 : std::tie(addr, addr_last_try) = addrman.SelectTriedCollision();
2726 : :
2727 [ # # # # ]: 0 : if (!addr.IsValid()) {
2728 : : // No tried table collisions. Select a new table address
2729 : : // for our feeler.
2730 [ # # ]: 0 : std::tie(addr, addr_last_try) = addrman.Select(true, reachable_nets);
2731 [ # # # # ]: 0 : } else if (AlreadyConnectedToAddress(addr)) {
2732 : : // If test-before-evict logic would have us connect to a
2733 : : // peer that we're already connected to, just mark that
2734 : : // address as Good(). We won't be able to initiate the
2735 : : // connection anyway, so this avoids inadvertently evicting
2736 : : // a currently-connected peer.
2737 [ # # ]: 0 : addrman.Good(addr);
2738 : : // Select a new table address for our feeler instead.
2739 [ # # ]: 0 : std::tie(addr, addr_last_try) = addrman.Select(true, reachable_nets);
2740 : : }
2741 : : } else {
2742 : : // Not a feeler
2743 : : // If preferred_net has a value set, pick an extra outbound
2744 : : // peer from that network. The eviction logic in net_processing
2745 : : // ensures that a peer from another network will be evicted.
2746 [ # # ]: 0 : std::tie(addr, addr_last_try) = preferred_net.has_value()
2747 [ # # # # : 0 : ? addrman.Select(false, {*preferred_net})
# # # # #
# ]
2748 [ # # ]: 0 : : addrman.Select(false, reachable_nets);
2749 : : }
2750 : :
2751 : : // Require outbound IPv4/IPv6 connections, other than feelers, to be to distinct network groups
2752 [ # # # # : 0 : if (!fFeeler && outbound_ipv46_peer_netgroups.count(m_netgroupman.GetGroup(addr))) {
# # # # ]
2753 : 0 : continue;
2754 : : }
2755 : :
2756 : : // if we selected an invalid or local address, restart
2757 [ # # # # : 0 : if (!addr.IsValid() || IsLocal(addr)) {
# # # # ]
2758 : : break;
2759 : : }
2760 : :
2761 [ # # # # ]: 0 : if (!g_reachable_nets.Contains(addr)) {
2762 : 0 : continue;
2763 : : }
2764 : :
2765 : : // only consider very recently tried nodes after 30 failed attempts
2766 [ # # # # ]: 0 : if (current_time - addr_last_try < 10min && nTries < 30) {
2767 : 0 : continue;
2768 : : }
2769 : :
2770 : : // for non-feelers, require all the services we'll want,
2771 : : // for feelers, only require they be a full node (only because most
2772 : : // SPV clients don't have a good address DB available)
2773 [ # # # # : 0 : if (!fFeeler && !m_msgproc->HasAllDesirableServiceFlags(addr.nServices)) {
# # ]
2774 : 0 : continue;
2775 [ # # # # ]: 0 : } else if (fFeeler && !MayHaveUsefulAddressDB(addr.nServices)) {
2776 : 0 : continue;
2777 : : }
2778 : :
2779 : : // Do not connect to bad ports, unless 50 invalid addresses have been selected already.
2780 [ # # # # : 0 : if (nTries < 50 && (addr.IsIPv4() || addr.IsIPv6()) && IsBadPort(addr.GetPort())) {
# # # # #
# # # ]
2781 : 0 : continue;
2782 : : }
2783 : :
2784 : : // Do not make automatic outbound connections to addnode peers, to
2785 : : // not use our limited outbound slots for them and to ensure
2786 : : // addnode connections benefit from their intended protections.
2787 [ # # # # ]: 0 : if (AddedNodesContain(addr)) {
2788 [ # # # # : 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Debug, "Not making automatic %s%s connection to %s peer selected for manual (addnode) connection%s\n",
# # # # #
# # # # #
# # # # #
# # # # #
# # ]
2789 : : preferred_net.has_value() ? "network-specific " : "",
2790 : : ConnectionTypeAsString(conn_type), GetNetworkName(addr.GetNetwork()),
2791 : : fLogIPs ? strprintf(": %s", addr.ToStringAddrPort()) : "");
2792 : 0 : continue;
2793 : : }
2794 : :
2795 : 0 : addrConnect = addr;
2796 : : break;
2797 : 0 : }
2798 : :
2799 [ # # # # ]: 0 : if (addrConnect.IsValid()) {
2800 [ # # ]: 0 : if (fFeeler) {
2801 : : // Add small amount of random noise before connection to avoid synchronization.
2802 [ # # # # ]: 0 : if (!interruptNet.sleep_for(rng.rand_uniform_duration<CThreadInterrupt::Clock>(FEELER_SLEEP_WINDOW))) {
2803 : 0 : return;
2804 : : }
2805 [ # # # # : 0 : LogDebug(BCLog::NET, "Making feeler connection to %s\n", addrConnect.ToStringAddrPort());
# # # # ]
2806 : : }
2807 : :
2808 [ # # # # : 0 : if (preferred_net != std::nullopt) LogDebug(BCLog::NET, "Making network specific connection to %s on %s.\n", addrConnect.ToStringAddrPort(), GetNetworkName(preferred_net.value()));
# # # # #
# # # #
# ]
2809 : :
2810 : : // Record addrman failure attempts when node has at least 2 persistent outbound connections to peers with
2811 : : // different netgroups in ipv4/ipv6 networks + all peers in Tor/I2P/CJDNS networks.
2812 : : // Don't record addrman failure attempts when node is offline. This can be identified since all local
2813 : : // network connections (if any) belong in the same netgroup, and the size of `outbound_ipv46_peer_netgroups` would only be 1.
2814 [ # # ]: 0 : const bool count_failures{((int)outbound_ipv46_peer_netgroups.size() + outbound_privacy_network_peers) >= std::min(m_max_automatic_connections - 1, 2)};
2815 : : // Use BIP324 transport when both us and them have NODE_V2_P2P set.
2816 [ # # ]: 0 : const bool use_v2transport(addrConnect.nServices & GetLocalServices() & NODE_P2P_V2);
2817 [ # # ]: 0 : OpenNetworkConnection(addrConnect, count_failures, std::move(grant), /*strDest=*/nullptr, conn_type, use_v2transport);
2818 : : }
2819 : 0 : }
2820 : 0 : }
2821 : :
2822 : 0 : std::vector<CAddress> CConnman::GetCurrentBlockRelayOnlyConns() const
2823 : : {
2824 : 0 : std::vector<CAddress> ret;
2825 [ # # ]: 0 : LOCK(m_nodes_mutex);
2826 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
2827 [ # # ]: 0 : if (pnode->IsBlockOnlyConn()) {
2828 [ # # ]: 0 : ret.push_back(pnode->addr);
2829 : : }
2830 : : }
2831 : :
2832 [ # # ]: 0 : return ret;
2833 : 0 : }
2834 : :
2835 : 0 : std::vector<AddedNodeInfo> CConnman::GetAddedNodeInfo(bool include_connected) const
2836 : : {
2837 : 0 : std::vector<AddedNodeInfo> ret;
2838 : :
2839 [ # # ]: 0 : std::list<AddedNodeParams> lAddresses(0);
2840 : 0 : {
2841 [ # # ]: 0 : LOCK(m_added_nodes_mutex);
2842 [ # # ]: 0 : ret.reserve(m_added_node_params.size());
2843 [ # # ]: 0 : std::copy(m_added_node_params.cbegin(), m_added_node_params.cend(), std::back_inserter(lAddresses));
2844 : 0 : }
2845 : :
2846 : :
2847 : : // Build a map of all already connected addresses (by IP:port and by name) to inbound/outbound and resolved CService
2848 [ # # ]: 0 : std::map<CService, bool> mapConnected;
2849 : 0 : std::map<std::string, std::pair<bool, CService>> mapConnectedByName;
2850 : 0 : {
2851 [ # # ]: 0 : LOCK(m_nodes_mutex);
2852 [ # # ]: 0 : for (const CNode* pnode : m_nodes) {
2853 [ # # # # ]: 0 : if (pnode->addr.IsValid()) {
2854 [ # # ]: 0 : mapConnected[pnode->addr] = pnode->IsInboundConn();
2855 : : }
2856 [ # # ]: 0 : std::string addrName{pnode->m_addr_name};
2857 [ # # ]: 0 : if (!addrName.empty()) {
2858 [ # # ]: 0 : mapConnectedByName[std::move(addrName)] = std::make_pair(pnode->IsInboundConn(), static_cast<const CService&>(pnode->addr));
2859 : : }
2860 : 0 : }
2861 : 0 : }
2862 : :
2863 [ # # ]: 0 : for (const auto& addr : lAddresses) {
2864 [ # # # # : 0 : CService service{MaybeFlipIPv6toCJDNS(LookupNumeric(addr.m_added_node, GetDefaultPort(addr.m_added_node)))};
# # # # ]
2865 [ # # # # ]: 0 : AddedNodeInfo addedNode{addr, CService(), false, false};
2866 [ # # # # ]: 0 : if (service.IsValid()) {
2867 : : // strAddNode is an IP:port
2868 [ # # ]: 0 : auto it = mapConnected.find(service);
2869 [ # # ]: 0 : if (it != mapConnected.end()) {
2870 [ # # ]: 0 : if (!include_connected) {
2871 : 0 : continue;
2872 : : }
2873 : 0 : addedNode.resolvedAddress = service;
2874 : 0 : addedNode.fConnected = true;
2875 : 0 : addedNode.fInbound = it->second;
2876 : : }
2877 : : } else {
2878 : : // strAddNode is a name
2879 : 0 : auto it = mapConnectedByName.find(addr.m_added_node);
2880 [ # # ]: 0 : if (it != mapConnectedByName.end()) {
2881 [ # # ]: 0 : if (!include_connected) {
2882 : 0 : continue;
2883 : : }
2884 : 0 : addedNode.resolvedAddress = it->second.second;
2885 : 0 : addedNode.fConnected = true;
2886 : 0 : addedNode.fInbound = it->second.first;
2887 : : }
2888 : : }
2889 [ # # ]: 0 : ret.emplace_back(std::move(addedNode));
2890 : 0 : }
2891 : :
2892 : 0 : return ret;
2893 : 0 : }
2894 : :
2895 : 0 : void CConnman::ThreadOpenAddedConnections()
2896 : : {
2897 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2898 : 0 : AssertLockNotHeld(m_reconnections_mutex);
2899 : 0 : while (true)
2900 : : {
2901 : 0 : CSemaphoreGrant grant(*semAddnode);
2902 [ # # ]: 0 : std::vector<AddedNodeInfo> vInfo = GetAddedNodeInfo(/*include_connected=*/false);
2903 : 0 : bool tried = false;
2904 [ # # ]: 0 : for (const AddedNodeInfo& info : vInfo) {
2905 [ # # ]: 0 : if (!grant) {
2906 : : // If we've used up our semaphore and need a new one, let's not wait here since while we are waiting
2907 : : // the addednodeinfo state might change.
2908 : : break;
2909 : : }
2910 : 0 : tried = true;
2911 [ # # ]: 0 : CAddress addr(CService(), NODE_NONE);
2912 [ # # ]: 0 : OpenNetworkConnection(addr, false, std::move(grant), info.m_params.m_added_node.c_str(), ConnectionType::MANUAL, info.m_params.m_use_v2transport);
2913 [ # # # # ]: 0 : if (!interruptNet.sleep_for(std::chrono::milliseconds(500))) return;
2914 : 0 : grant = CSemaphoreGrant(*semAddnode, /*fTry=*/true);
2915 : 0 : }
2916 : : // See if any reconnections are desired.
2917 [ # # ]: 0 : PerformReconnections();
2918 : : // Retry every 60 seconds if a connection was attempted, otherwise two seconds
2919 [ # # # # : 0 : if (!interruptNet.sleep_for(std::chrono::seconds(tried ? 60 : 2)))
# # ]
2920 : : return;
2921 : 0 : }
2922 : : }
2923 : :
2924 : : // if successful, this moves the passed grant to the constructed node
2925 : 0 : void CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant&& grant_outbound, const char *pszDest, ConnectionType conn_type, bool use_v2transport)
2926 : : {
2927 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2928 [ # # ]: 0 : assert(conn_type != ConnectionType::INBOUND);
2929 : :
2930 : : //
2931 : : // Initiate outbound network connection
2932 : : //
2933 [ # # ]: 0 : if (interruptNet) {
2934 : : return;
2935 : : }
2936 [ # # ]: 0 : if (!fNetworkActive) {
2937 : : return;
2938 : : }
2939 [ # # ]: 0 : if (!pszDest) {
2940 [ # # # # : 0 : bool banned_or_discouraged = m_banman && (m_banman->IsDiscouraged(addrConnect) || m_banman->IsBanned(addrConnect));
# # ]
2941 [ # # # # : 0 : if (IsLocal(addrConnect) || banned_or_discouraged || AlreadyConnectedToAddress(addrConnect)) {
# # ]
2942 : 0 : return;
2943 : : }
2944 [ # # # # ]: 0 : } else if (FindNode(std::string(pszDest)))
2945 : : return;
2946 : :
2947 [ # # ]: 0 : CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure, conn_type, use_v2transport);
2948 : :
2949 [ # # ]: 0 : if (!pnode)
2950 : : return;
2951 : 0 : pnode->grantOutbound = std::move(grant_outbound);
2952 : :
2953 : 0 : m_msgproc->InitializeNode(*pnode, m_local_services);
2954 : 0 : {
2955 : 0 : LOCK(m_nodes_mutex);
2956 [ # # ]: 0 : m_nodes.push_back(pnode);
2957 : :
2958 : : // update connection count by network
2959 [ # # # # ]: 0 : if (pnode->IsManualOrFullOutboundConn()) ++m_network_conn_counts[pnode->addr.GetNetwork()];
2960 : 0 : }
2961 : : }
2962 : :
2963 : : Mutex NetEventsInterface::g_msgproc_mutex;
2964 : :
2965 : 0 : void CConnman::ThreadMessageHandler()
2966 : : {
2967 : 0 : LOCK(NetEventsInterface::g_msgproc_mutex);
2968 : :
2969 [ # # ]: 0 : while (!flagInterruptMsgProc)
2970 : : {
2971 : 0 : bool fMoreWork = false;
2972 : :
2973 : 0 : {
2974 : : // Randomize the order in which we process messages from/to our peers.
2975 : : // This prevents attacks in which an attacker exploits having multiple
2976 : : // consecutive connections in the m_nodes list.
2977 [ # # ]: 0 : const NodesSnapshot snap{*this, /*shuffle=*/true};
2978 : :
2979 [ # # ]: 0 : for (CNode* pnode : snap.Nodes()) {
2980 [ # # ]: 0 : if (pnode->fDisconnect)
2981 : 0 : continue;
2982 : :
2983 : : // Receive messages
2984 [ # # ]: 0 : bool fMoreNodeWork = m_msgproc->ProcessMessages(pnode, flagInterruptMsgProc);
2985 [ # # # # ]: 0 : fMoreWork |= (fMoreNodeWork && !pnode->fPauseSend);
2986 [ # # ]: 0 : if (flagInterruptMsgProc)
2987 : : return;
2988 : : // Send messages
2989 [ # # ]: 0 : m_msgproc->SendMessages(pnode);
2990 : :
2991 [ # # ]: 0 : if (flagInterruptMsgProc)
2992 : : return;
2993 : : }
2994 [ # # ]: 0 : }
2995 : :
2996 [ # # ]: 0 : WAIT_LOCK(mutexMsgProc, lock);
2997 [ # # ]: 0 : if (!fMoreWork) {
2998 [ # # # # ]: 0 : condMsgProc.wait_until(lock, std::chrono::steady_clock::now() + std::chrono::milliseconds(100), [this]() EXCLUSIVE_LOCKS_REQUIRED(mutexMsgProc) { return fMsgProcWake; });
2999 : : }
3000 [ # # ]: 0 : fMsgProcWake = false;
3001 : 0 : }
3002 : 0 : }
3003 : :
3004 : 0 : void CConnman::ThreadI2PAcceptIncoming()
3005 : : {
3006 : 0 : static constexpr auto err_wait_begin = 1s;
3007 : 0 : static constexpr auto err_wait_cap = 5min;
3008 : 0 : auto err_wait = err_wait_begin;
3009 : :
3010 : 0 : bool advertising_listen_addr = false;
3011 : 0 : i2p::Connection conn;
3012 : :
3013 : 0 : auto SleepOnFailure = [&]() {
3014 : 0 : interruptNet.sleep_for(err_wait);
3015 [ # # ]: 0 : if (err_wait < err_wait_cap) {
3016 : 0 : err_wait += 1s;
3017 : : }
3018 : 0 : };
3019 : :
3020 [ # # # # ]: 0 : while (!interruptNet) {
3021 : :
3022 [ # # # # ]: 0 : if (!m_i2p_sam_session->Listen(conn)) {
3023 [ # # # # : 0 : if (advertising_listen_addr && conn.me.IsValid()) {
# # ]
3024 [ # # ]: 0 : RemoveLocal(conn.me);
3025 : : advertising_listen_addr = false;
3026 : : }
3027 [ # # ]: 0 : SleepOnFailure();
3028 : 0 : continue;
3029 : : }
3030 : :
3031 [ # # ]: 0 : if (!advertising_listen_addr) {
3032 [ # # ]: 0 : AddLocal(conn.me, LOCAL_MANUAL);
3033 : : advertising_listen_addr = true;
3034 : : }
3035 : :
3036 [ # # # # ]: 0 : if (!m_i2p_sam_session->Accept(conn)) {
3037 [ # # ]: 0 : SleepOnFailure();
3038 : 0 : continue;
3039 : : }
3040 : :
3041 [ # # ]: 0 : CreateNodeFromAcceptedSocket(std::move(conn.sock), NetPermissionFlags::None,
3042 : 0 : CAddress{conn.me, NODE_NONE}, CAddress{conn.peer, NODE_NONE});
3043 : :
3044 : 0 : err_wait = err_wait_begin;
3045 : : }
3046 : 0 : }
3047 : :
3048 : 0 : bool CConnman::BindListenPort(const CService& addrBind, bilingual_str& strError, NetPermissionFlags permissions)
3049 : : {
3050 : 0 : int nOne = 1;
3051 : :
3052 : : // Create socket for listening for incoming connections
3053 : 0 : struct sockaddr_storage sockaddr;
3054 : 0 : socklen_t len = sizeof(sockaddr);
3055 [ # # ]: 0 : if (!addrBind.GetSockAddr((struct sockaddr*)&sockaddr, &len))
3056 : : {
3057 [ # # # # : 0 : strError = strprintf(Untranslated("Bind address family for %s not supported"), addrBind.ToStringAddrPort());
# # ]
3058 [ # # ]: 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Error, "%s\n", strError.original);
3059 : 0 : return false;
3060 : : }
3061 : :
3062 : 0 : std::unique_ptr<Sock> sock = CreateSock(addrBind.GetSAFamily(), SOCK_STREAM, IPPROTO_TCP);
3063 [ # # ]: 0 : if (!sock) {
3064 [ # # # # : 0 : strError = strprintf(Untranslated("Couldn't open socket for incoming connections (socket returned error %s)"), NetworkErrorString(WSAGetLastError()));
# # # # ]
3065 [ # # # # : 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Error, "%s\n", strError.original);
# # ]
3066 : 0 : return false;
3067 : : }
3068 : :
3069 : : // Allow binding if the port is still in TIME_WAIT state after
3070 : : // the program was closed and restarted.
3071 [ # # # # ]: 0 : if (sock->SetSockOpt(SOL_SOCKET, SO_REUSEADDR, (sockopt_arg_type)&nOne, sizeof(int)) == SOCKET_ERROR) {
3072 [ # # # # : 0 : strError = strprintf(Untranslated("Error setting SO_REUSEADDR on socket: %s, continuing anyway"), NetworkErrorString(WSAGetLastError()));
# # # # ]
3073 [ # # ]: 0 : LogPrintf("%s\n", strError.original);
3074 : : }
3075 : :
3076 : : // some systems don't have IPV6_V6ONLY but are always v6only; others do have the option
3077 : : // and enable it by default or not. Try to enable it, if possible.
3078 [ # # ]: 0 : if (addrBind.IsIPv6()) {
3079 : : #ifdef IPV6_V6ONLY
3080 [ # # # # ]: 0 : if (sock->SetSockOpt(IPPROTO_IPV6, IPV6_V6ONLY, (sockopt_arg_type)&nOne, sizeof(int)) == SOCKET_ERROR) {
3081 [ # # # # : 0 : strError = strprintf(Untranslated("Error setting IPV6_V6ONLY on socket: %s, continuing anyway"), NetworkErrorString(WSAGetLastError()));
# # # # ]
3082 [ # # ]: 0 : LogPrintf("%s\n", strError.original);
3083 : : }
3084 : : #endif
3085 : : #ifdef WIN32
3086 : : int nProtLevel = PROTECTION_LEVEL_UNRESTRICTED;
3087 : : if (sock->SetSockOpt(IPPROTO_IPV6, IPV6_PROTECTION_LEVEL, (const char*)&nProtLevel, sizeof(int)) == SOCKET_ERROR) {
3088 : : strError = strprintf(Untranslated("Error setting IPV6_PROTECTION_LEVEL on socket: %s, continuing anyway"), NetworkErrorString(WSAGetLastError()));
3089 : : LogPrintf("%s\n", strError.original);
3090 : : }
3091 : : #endif
3092 : : }
3093 : :
3094 [ # # # # ]: 0 : if (sock->Bind(reinterpret_cast<struct sockaddr*>(&sockaddr), len) == SOCKET_ERROR) {
3095 : 0 : int nErr = WSAGetLastError();
3096 [ # # ]: 0 : if (nErr == WSAEADDRINUSE)
3097 [ # # # # : 0 : strError = strprintf(_("Unable to bind to %s on this computer. %s is probably already running."), addrBind.ToStringAddrPort(), CLIENT_NAME);
# # ]
3098 : : else
3099 [ # # # # : 0 : strError = strprintf(_("Unable to bind to %s on this computer (bind returned error %s)"), addrBind.ToStringAddrPort(), NetworkErrorString(nErr));
# # # # ]
3100 [ # # # # : 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Error, "%s\n", strError.original);
# # ]
3101 : 0 : return false;
3102 : : }
3103 [ # # # # ]: 0 : LogPrintf("Bound to %s\n", addrBind.ToStringAddrPort());
3104 : :
3105 : : // Listen for incoming connections
3106 [ # # # # ]: 0 : if (sock->Listen(SOMAXCONN) == SOCKET_ERROR)
3107 : : {
3108 [ # # # # : 0 : strError = strprintf(_("Listening for incoming connections failed (listen returned error %s)"), NetworkErrorString(WSAGetLastError()));
# # ]
3109 [ # # # # : 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Error, "%s\n", strError.original);
# # ]
3110 : 0 : return false;
3111 : : }
3112 : :
3113 [ # # ]: 0 : vhListenSocket.emplace_back(std::move(sock), permissions);
3114 : : return true;
3115 : 0 : }
3116 : :
3117 : 0 : void Discover()
3118 : : {
3119 [ # # ]: 0 : if (!fDiscover)
3120 : : return;
3121 : :
3122 [ # # ]: 0 : for (const CNetAddr &addr: GetLocalAddresses()) {
3123 [ # # # # ]: 0 : if (AddLocal(addr, LOCAL_IF))
3124 [ # # # # ]: 0 : LogPrintf("%s: %s\n", __func__, addr.ToStringAddr());
3125 : 0 : }
3126 : : }
3127 : :
3128 : 0 : void CConnman::SetNetworkActive(bool active)
3129 : : {
3130 : 0 : LogPrintf("%s: %s\n", __func__, active);
3131 : :
3132 [ # # ]: 0 : if (fNetworkActive == active) {
3133 : : return;
3134 : : }
3135 : :
3136 [ # # ]: 0 : fNetworkActive = active;
3137 : :
3138 [ # # ]: 0 : if (m_client_interface) {
3139 : 0 : m_client_interface->NotifyNetworkActiveChanged(fNetworkActive);
3140 : : }
3141 : : }
3142 : :
3143 : 0 : CConnman::CConnman(uint64_t nSeed0In, uint64_t nSeed1In, AddrMan& addrman_in,
3144 : 0 : const NetGroupManager& netgroupman, const CChainParams& params, bool network_active)
3145 : 0 : : addrman(addrman_in)
3146 [ # # ]: 0 : , m_netgroupman{netgroupman}
3147 : 0 : , nSeed0(nSeed0In)
3148 : 0 : , nSeed1(nSeed1In)
3149 [ # # # # : 0 : , m_params(params)
# # # # ]
3150 : : {
3151 [ # # ]: 0 : SetTryNewOutboundPeer(false);
3152 : :
3153 : 0 : Options connOptions;
3154 [ # # ]: 0 : Init(connOptions);
3155 [ # # ]: 0 : SetNetworkActive(network_active);
3156 : 0 : }
3157 : :
3158 : 0 : NodeId CConnman::GetNewNodeId()
3159 : : {
3160 : 0 : return nLastNodeId.fetch_add(1, std::memory_order_relaxed);
3161 : : }
3162 : :
3163 : 0 : uint16_t CConnman::GetDefaultPort(Network net) const
3164 : : {
3165 [ # # ]: 0 : return net == NET_I2P ? I2P_SAM31_PORT : m_params.GetDefaultPort();
3166 : : }
3167 : :
3168 : 0 : uint16_t CConnman::GetDefaultPort(const std::string& addr) const
3169 : : {
3170 : 0 : CNetAddr a;
3171 [ # # # # : 0 : return a.SetSpecial(addr) ? GetDefaultPort(a.GetNetwork()) : m_params.GetDefaultPort();
# # # # ]
3172 : 0 : }
3173 : :
3174 : 0 : bool CConnman::Bind(const CService& addr_, unsigned int flags, NetPermissionFlags permissions)
3175 : : {
3176 : 0 : const CService addr{MaybeFlipIPv6toCJDNS(addr_)};
3177 : :
3178 [ # # ]: 0 : bilingual_str strError;
3179 [ # # # # ]: 0 : if (!BindListenPort(addr, strError, permissions)) {
3180 [ # # # # ]: 0 : if ((flags & BF_REPORT_ERROR) && m_client_interface) {
3181 [ # # # # ]: 0 : m_client_interface->ThreadSafeMessageBox(strError, "", CClientUIInterface::MSG_ERROR);
3182 : : }
3183 : 0 : return false;
3184 : : }
3185 : :
3186 [ # # # # : 0 : if (addr.IsRoutable() && fDiscover && !(flags & BF_DONT_ADVERTISE) && !NetPermissions::HasFlag(permissions, NetPermissionFlags::NoBan)) {
# # # # #
# ]
3187 [ # # ]: 0 : AddLocal(addr, LOCAL_BIND);
3188 : : }
3189 : :
3190 : : return true;
3191 : 0 : }
3192 : :
3193 : 0 : bool CConnman::InitBinds(const Options& options)
3194 : : {
3195 [ # # ]: 0 : for (const auto& addrBind : options.vBinds) {
3196 [ # # ]: 0 : if (!Bind(addrBind, BF_REPORT_ERROR, NetPermissionFlags::None)) {
3197 : : return false;
3198 : : }
3199 : : }
3200 [ # # ]: 0 : for (const auto& addrBind : options.vWhiteBinds) {
3201 [ # # ]: 0 : if (!Bind(addrBind.m_service, BF_REPORT_ERROR, addrBind.m_flags)) {
3202 : : return false;
3203 : : }
3204 : : }
3205 [ # # ]: 0 : for (const auto& addr_bind : options.onion_binds) {
3206 [ # # ]: 0 : if (!Bind(addr_bind, BF_REPORT_ERROR | BF_DONT_ADVERTISE, NetPermissionFlags::None)) {
3207 : : return false;
3208 : : }
3209 : : }
3210 [ # # ]: 0 : if (options.bind_on_any) {
3211 : : // Don't consider errors to bind on IPv6 "::" fatal because the host OS
3212 : : // may not have IPv6 support and the user did not explicitly ask us to
3213 : : // bind on that.
3214 : 0 : const CService ipv6_any{in6_addr(IN6ADDR_ANY_INIT), GetListenPort()}; // ::
3215 [ # # ]: 0 : Bind(ipv6_any, BF_NONE, NetPermissionFlags::None);
3216 : :
3217 : 0 : struct in_addr inaddr_any;
3218 : 0 : inaddr_any.s_addr = htonl(INADDR_ANY);
3219 [ # # # # ]: 0 : const CService ipv4_any{inaddr_any, GetListenPort()}; // 0.0.0.0
3220 [ # # # # ]: 0 : if (!Bind(ipv4_any, BF_REPORT_ERROR, NetPermissionFlags::None)) {
3221 : 0 : return false;
3222 : : }
3223 : 0 : }
3224 : : return true;
3225 : : }
3226 : :
3227 : 0 : bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
3228 : : {
3229 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3230 : 0 : Init(connOptions);
3231 : :
3232 [ # # # # ]: 0 : if (fListen && !InitBinds(connOptions)) {
3233 [ # # ]: 0 : if (m_client_interface) {
3234 [ # # ]: 0 : m_client_interface->ThreadSafeMessageBox(
3235 [ # # ]: 0 : _("Failed to listen on any port. Use -listen=0 if you want this."),
3236 : : "", CClientUIInterface::MSG_ERROR);
3237 : : }
3238 : 0 : return false;
3239 : : }
3240 : :
3241 : 0 : Proxy i2p_sam;
3242 [ # # # # : 0 : if (GetProxy(NET_I2P, i2p_sam) && connOptions.m_i2p_accept_incoming) {
# # ]
3243 [ # # # # ]: 0 : m_i2p_sam_session = std::make_unique<i2p::sam::Session>(gArgs.GetDataDirNet() / "i2p_private_key",
3244 [ # # ]: 0 : i2p_sam, &interruptNet);
3245 : : }
3246 : :
3247 : : // 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)
3248 [ # # ]: 0 : std::vector<std::string> seed_nodes = connOptions.vSeedNodes;
3249 [ # # ]: 0 : if (!seed_nodes.empty()) {
3250 : 0 : std::shuffle(seed_nodes.begin(), seed_nodes.end(), FastRandomContext{});
3251 : : }
3252 : :
3253 [ # # ]: 0 : if (m_use_addrman_outgoing) {
3254 : : // Load addresses from anchors.dat
3255 [ # # # # : 0 : m_anchors = ReadAnchors(gArgs.GetDataDirNet() / ANCHORS_DATABASE_FILENAME);
# # ]
3256 [ # # ]: 0 : if (m_anchors.size() > MAX_BLOCK_RELAY_ONLY_ANCHORS) {
3257 [ # # ]: 0 : m_anchors.resize(MAX_BLOCK_RELAY_ONLY_ANCHORS);
3258 : : }
3259 [ # # ]: 0 : LogPrintf("%i block-relay-only anchors will be tried for connections.\n", m_anchors.size());
3260 : : }
3261 : :
3262 [ # # ]: 0 : if (m_client_interface) {
3263 [ # # # # ]: 0 : m_client_interface->InitMessage(_("Starting network threads…").translated);
3264 : : }
3265 : :
3266 : 0 : fAddressesInitialized = true;
3267 : :
3268 [ # # ]: 0 : if (semOutbound == nullptr) {
3269 : : // initialize semaphore
3270 [ # # # # ]: 0 : semOutbound = std::make_unique<CSemaphore>(std::min(m_max_automatic_outbound, m_max_automatic_connections));
3271 : : }
3272 [ # # ]: 0 : if (semAddnode == nullptr) {
3273 : : // initialize semaphore
3274 [ # # ]: 0 : semAddnode = std::make_unique<CSemaphore>(m_max_addnode);
3275 : : }
3276 : :
3277 : : //
3278 : : // Start threads
3279 : : //
3280 [ # # ]: 0 : assert(m_msgproc);
3281 [ # # ]: 0 : interruptNet.reset();
3282 [ # # ]: 0 : flagInterruptMsgProc = false;
3283 : :
3284 : 0 : {
3285 [ # # ]: 0 : LOCK(mutexMsgProc);
3286 [ # # ]: 0 : fMsgProcWake = false;
3287 : 0 : }
3288 : :
3289 : : // Send and receive from sockets, accept connections
3290 [ # # ]: 0 : threadSocketHandler = std::thread(&util::TraceThread, "net", [this] { ThreadSocketHandler(); });
3291 : :
3292 [ # # # # : 0 : if (!gArgs.GetBoolArg("-dnsseed", DEFAULT_DNSSEED))
# # ]
3293 [ # # ]: 0 : LogPrintf("DNS seeding disabled\n");
3294 : : else
3295 [ # # ]: 0 : threadDNSAddressSeed = std::thread(&util::TraceThread, "dnsseed", [this] { ThreadDNSAddressSeed(); });
3296 : :
3297 : : // Initiate manual connections
3298 [ # # ]: 0 : threadOpenAddedConnections = std::thread(&util::TraceThread, "addcon", [this] { ThreadOpenAddedConnections(); });
3299 : :
3300 [ # # # # ]: 0 : if (connOptions.m_use_addrman_outgoing && !connOptions.m_specified_outgoing.empty()) {
3301 [ # # ]: 0 : if (m_client_interface) {
3302 [ # # # # ]: 0 : m_client_interface->ThreadSafeMessageBox(
3303 [ # # ]: 0 : _("Cannot provide specific connections and have addrman find outgoing connections at the same time."),
3304 : : "", CClientUIInterface::MSG_ERROR);
3305 : : }
3306 : 0 : return false;
3307 : : }
3308 [ # # # # ]: 0 : if (connOptions.m_use_addrman_outgoing || !connOptions.m_specified_outgoing.empty()) {
3309 : 0 : threadOpenConnections = std::thread(
3310 [ # # ]: 0 : &util::TraceThread, "opencon",
3311 [ # # # # : 0 : [this, connect = connOptions.m_specified_outgoing, seed_nodes = std::move(seed_nodes)] { ThreadOpenConnections(connect, seed_nodes); });
# # ]
3312 : : }
3313 : :
3314 : : // Process messages
3315 [ # # ]: 0 : threadMessageHandler = std::thread(&util::TraceThread, "msghand", [this] { ThreadMessageHandler(); });
3316 : :
3317 [ # # ]: 0 : if (m_i2p_sam_session) {
3318 : 0 : threadI2PAcceptIncoming =
3319 [ # # ]: 0 : std::thread(&util::TraceThread, "i2paccept", [this] { ThreadI2PAcceptIncoming(); });
3320 : : }
3321 : :
3322 : : // Dump network addresses
3323 [ # # ]: 0 : scheduler.scheduleEvery([this] { DumpAddresses(); }, DUMP_PEERS_INTERVAL);
3324 : :
3325 : : // Run the ASMap Health check once and then schedule it to run every 24h.
3326 [ # # # # ]: 0 : if (m_netgroupman.UsingASMap()) {
3327 [ # # ]: 0 : ASMapHealthCheck();
3328 [ # # ]: 0 : scheduler.scheduleEvery([this] { ASMapHealthCheck(); }, ASMAP_HEALTH_CHECK_INTERVAL);
3329 : : }
3330 : :
3331 : : return true;
3332 : 0 : }
3333 : :
3334 : : class CNetCleanup
3335 : : {
3336 : : public:
3337 : : CNetCleanup() = default;
3338 : :
3339 : 2 : ~CNetCleanup()
3340 : : {
3341 : : #ifdef WIN32
3342 : : // Shutdown Windows Sockets
3343 : : WSACleanup();
3344 : : #endif
3345 : 2 : }
3346 : : };
3347 : : static CNetCleanup instance_of_cnetcleanup;
3348 : :
3349 : 0 : void CConnman::Interrupt()
3350 : : {
3351 : 0 : {
3352 : 0 : LOCK(mutexMsgProc);
3353 [ # # ]: 0 : flagInterruptMsgProc = true;
3354 : 0 : }
3355 : 0 : condMsgProc.notify_all();
3356 : :
3357 : 0 : interruptNet();
3358 : 0 : g_socks5_interrupt();
3359 : :
3360 [ # # ]: 0 : if (semOutbound) {
3361 [ # # ]: 0 : for (int i=0; i<m_max_automatic_outbound; i++) {
3362 : 0 : semOutbound->post();
3363 : : }
3364 : : }
3365 : :
3366 [ # # ]: 0 : if (semAddnode) {
3367 [ # # ]: 0 : for (int i=0; i<m_max_addnode; i++) {
3368 : 0 : semAddnode->post();
3369 : : }
3370 : : }
3371 : 0 : }
3372 : :
3373 : 0 : void CConnman::StopThreads()
3374 : : {
3375 [ # # ]: 0 : if (threadI2PAcceptIncoming.joinable()) {
3376 : 0 : threadI2PAcceptIncoming.join();
3377 : : }
3378 [ # # ]: 0 : if (threadMessageHandler.joinable())
3379 : 0 : threadMessageHandler.join();
3380 [ # # ]: 0 : if (threadOpenConnections.joinable())
3381 : 0 : threadOpenConnections.join();
3382 [ # # ]: 0 : if (threadOpenAddedConnections.joinable())
3383 : 0 : threadOpenAddedConnections.join();
3384 [ # # ]: 0 : if (threadDNSAddressSeed.joinable())
3385 : 0 : threadDNSAddressSeed.join();
3386 [ # # ]: 0 : if (threadSocketHandler.joinable())
3387 : 0 : threadSocketHandler.join();
3388 : 0 : }
3389 : :
3390 : 0 : void CConnman::StopNodes()
3391 : : {
3392 [ # # ]: 0 : if (fAddressesInitialized) {
3393 : 0 : DumpAddresses();
3394 : 0 : fAddressesInitialized = false;
3395 : :
3396 [ # # ]: 0 : if (m_use_addrman_outgoing) {
3397 : : // Anchor connections are only dumped during clean shutdown.
3398 : 0 : std::vector<CAddress> anchors_to_dump = GetCurrentBlockRelayOnlyConns();
3399 [ # # ]: 0 : if (anchors_to_dump.size() > MAX_BLOCK_RELAY_ONLY_ANCHORS) {
3400 [ # # ]: 0 : anchors_to_dump.resize(MAX_BLOCK_RELAY_ONLY_ANCHORS);
3401 : : }
3402 [ # # # # : 0 : DumpAnchors(gArgs.GetDataDirNet() / ANCHORS_DATABASE_FILENAME, anchors_to_dump);
# # ]
3403 : 0 : }
3404 : : }
3405 : :
3406 : : // Delete peer connections.
3407 : 0 : std::vector<CNode*> nodes;
3408 [ # # # # ]: 0 : WITH_LOCK(m_nodes_mutex, nodes.swap(m_nodes));
3409 [ # # ]: 0 : for (CNode* pnode : nodes) {
3410 [ # # ]: 0 : pnode->CloseSocketDisconnect();
3411 [ # # ]: 0 : DeleteNode(pnode);
3412 : : }
3413 : :
3414 [ # # ]: 0 : for (CNode* pnode : m_nodes_disconnected) {
3415 [ # # ]: 0 : DeleteNode(pnode);
3416 : : }
3417 : 0 : m_nodes_disconnected.clear();
3418 : 0 : vhListenSocket.clear();
3419 [ # # ]: 0 : semOutbound.reset();
3420 [ # # ]: 0 : semAddnode.reset();
3421 : 0 : }
3422 : :
3423 : 0 : void CConnman::DeleteNode(CNode* pnode)
3424 : : {
3425 [ # # ]: 0 : assert(pnode);
3426 : 0 : m_msgproc->FinalizeNode(*pnode);
3427 : 0 : delete pnode;
3428 : 0 : }
3429 : :
3430 : 0 : CConnman::~CConnman()
3431 : : {
3432 : 0 : Interrupt();
3433 : 0 : Stop();
3434 : 0 : }
3435 : :
3436 : 0 : std::vector<CAddress> CConnman::GetAddresses(size_t max_addresses, size_t max_pct, std::optional<Network> network, const bool filtered) const
3437 : : {
3438 : 0 : std::vector<CAddress> addresses = addrman.GetAddr(max_addresses, max_pct, network, filtered);
3439 [ # # ]: 0 : if (m_banman) {
3440 [ # # ]: 0 : addresses.erase(std::remove_if(addresses.begin(), addresses.end(),
3441 [ # # # # ]: 0 : [this](const CAddress& addr){return m_banman->IsDiscouraged(addr) || m_banman->IsBanned(addr);}),
3442 [ # # ]: 0 : addresses.end());
3443 : : }
3444 : 0 : return addresses;
3445 : 0 : }
3446 : :
3447 : 0 : std::vector<CAddress> CConnman::GetAddresses(CNode& requestor, size_t max_addresses, size_t max_pct)
3448 : : {
3449 : 0 : auto local_socket_bytes = requestor.addrBind.GetAddrBytes();
3450 [ # # ]: 0 : uint64_t cache_id = GetDeterministicRandomizer(RANDOMIZER_ID_ADDRCACHE)
3451 [ # # # # : 0 : .Write(requestor.ConnectedThroughNetwork())
# # ]
3452 [ # # # # ]: 0 : .Write(local_socket_bytes)
3453 : : // For outbound connections, the port of the bound address is randomly
3454 : : // assigned by the OS and would therefore not be useful for seeding.
3455 [ # # # # : 0 : .Write(requestor.IsInboundConn() ? requestor.addrBind.GetPort() : 0)
# # ]
3456 [ # # ]: 0 : .Finalize();
3457 : 0 : const auto current_time = GetTime<std::chrono::microseconds>();
3458 [ # # ]: 0 : auto r = m_addr_response_caches.emplace(cache_id, CachedAddrResponse{});
3459 [ # # ]: 0 : CachedAddrResponse& cache_entry = r.first->second;
3460 [ # # ]: 0 : if (cache_entry.m_cache_entry_expiration < current_time) { // If emplace() added new one it has expiration 0.
3461 [ # # ]: 0 : cache_entry.m_addrs_response_cache = GetAddresses(max_addresses, max_pct, /*network=*/std::nullopt);
3462 : : // Choosing a proper cache lifetime is a trade-off between the privacy leak minimization
3463 : : // and the usefulness of ADDR responses to honest users.
3464 : : //
3465 : : // Longer cache lifetime makes it more difficult for an attacker to scrape
3466 : : // enough AddrMan data to maliciously infer something useful.
3467 : : // By the time an attacker scraped enough AddrMan records, most of
3468 : : // the records should be old enough to not leak topology info by
3469 : : // e.g. analyzing real-time changes in timestamps.
3470 : : //
3471 : : // It takes only several hundred requests to scrape everything from an AddrMan containing 100,000 nodes,
3472 : : // so ~24 hours of cache lifetime indeed makes the data less inferable by the time
3473 : : // most of it could be scraped (considering that timestamps are updated via
3474 : : // ADDR self-announcements and when nodes communicate).
3475 : : // We also should be robust to those attacks which may not require scraping *full* victim's AddrMan
3476 : : // (because even several timestamps of the same handful of nodes may leak privacy).
3477 : : //
3478 : : // On the other hand, longer cache lifetime makes ADDR responses
3479 : : // outdated and less useful for an honest requestor, e.g. if most nodes
3480 : : // in the ADDR response are no longer active.
3481 : : //
3482 : : // However, the churn in the network is known to be rather low. Since we consider
3483 : : // nodes to be "terrible" (see IsTerrible()) if the timestamps are older than 30 days,
3484 : : // max. 24 hours of "penalty" due to cache shouldn't make any meaningful difference
3485 : : // in terms of the freshness of the response.
3486 : 0 : cache_entry.m_cache_entry_expiration = current_time +
3487 : 0 : 21h + FastRandomContext().randrange<std::chrono::microseconds>(6h);
3488 : : }
3489 [ # # ]: 0 : return cache_entry.m_addrs_response_cache;
3490 : 0 : }
3491 : :
3492 : 0 : bool CConnman::AddNode(const AddedNodeParams& add)
3493 : : {
3494 [ # # # # ]: 0 : const CService resolved(LookupNumeric(add.m_added_node, GetDefaultPort(add.m_added_node)));
3495 [ # # ]: 0 : const bool resolved_is_valid{resolved.IsValid()};
3496 : :
3497 [ # # ]: 0 : LOCK(m_added_nodes_mutex);
3498 [ # # ]: 0 : for (const auto& it : m_added_node_params) {
3499 [ # # # # : 0 : 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;
# # # # #
# # # # #
# # # # #
# # # ]
3500 : : }
3501 : :
3502 [ # # ]: 0 : m_added_node_params.push_back(add);
3503 : : return true;
3504 : 0 : }
3505 : :
3506 : 0 : bool CConnman::RemoveAddedNode(const std::string& strNode)
3507 : : {
3508 : 0 : LOCK(m_added_nodes_mutex);
3509 [ # # ]: 0 : for (auto it = m_added_node_params.begin(); it != m_added_node_params.end(); ++it) {
3510 [ # # ]: 0 : if (strNode == it->m_added_node) {
3511 : 0 : m_added_node_params.erase(it);
3512 : 0 : return true;
3513 : : }
3514 : : }
3515 : : return false;
3516 : 0 : }
3517 : :
3518 : 0 : bool CConnman::AddedNodesContain(const CAddress& addr) const
3519 : : {
3520 : 0 : AssertLockNotHeld(m_added_nodes_mutex);
3521 : 0 : const std::string addr_str{addr.ToStringAddr()};
3522 [ # # ]: 0 : const std::string addr_port_str{addr.ToStringAddrPort()};
3523 [ # # ]: 0 : LOCK(m_added_nodes_mutex);
3524 [ # # ]: 0 : return (m_added_node_params.size() < 24 // bound the query to a reasonable limit
3525 [ # # # # ]: 0 : && std::any_of(m_added_node_params.cbegin(), m_added_node_params.cend(),
3526 [ # # # # : 0 : [&](const auto& p) { return p.m_added_node == addr_str || p.m_added_node == addr_port_str; }));
# # ]
3527 : 0 : }
3528 : :
3529 : 0 : size_t CConnman::GetNodeCount(ConnectionDirection flags) const
3530 : : {
3531 : 0 : LOCK(m_nodes_mutex);
3532 [ # # ]: 0 : if (flags == ConnectionDirection::Both) // Shortcut if we want total
3533 : 0 : return m_nodes.size();
3534 : :
3535 : 0 : int nNum = 0;
3536 [ # # ]: 0 : for (const auto& pnode : m_nodes) {
3537 [ # # # # ]: 0 : if (flags & (pnode->IsInboundConn() ? ConnectionDirection::In : ConnectionDirection::Out)) {
3538 : 0 : nNum++;
3539 : : }
3540 : : }
3541 : :
3542 : 0 : return nNum;
3543 : 0 : }
3544 : :
3545 : :
3546 : 0 : std::map<CNetAddr, LocalServiceInfo> CConnman::getNetLocalAddresses() const
3547 : : {
3548 : 0 : LOCK(g_maplocalhost_mutex);
3549 [ # # # # ]: 0 : return mapLocalHost;
3550 : 0 : }
3551 : :
3552 : 0 : uint32_t CConnman::GetMappedAS(const CNetAddr& addr) const
3553 : : {
3554 : 0 : return m_netgroupman.GetMappedAS(addr);
3555 : : }
3556 : :
3557 : 0 : void CConnman::GetNodeStats(std::vector<CNodeStats>& vstats) const
3558 : : {
3559 : 0 : vstats.clear();
3560 : 0 : LOCK(m_nodes_mutex);
3561 [ # # ]: 0 : vstats.reserve(m_nodes.size());
3562 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
3563 [ # # ]: 0 : vstats.emplace_back();
3564 [ # # ]: 0 : pnode->CopyStats(vstats.back());
3565 [ # # ]: 0 : vstats.back().m_mapped_as = GetMappedAS(pnode->addr);
3566 : : }
3567 : 0 : }
3568 : :
3569 : 0 : bool CConnman::DisconnectNode(const std::string& strNode)
3570 : : {
3571 : 0 : LOCK(m_nodes_mutex);
3572 [ # # # # ]: 0 : if (CNode* pnode = FindNode(strNode)) {
3573 [ # # # # : 0 : LogDebug(BCLog::NET, "disconnect by address%s matched peer=%d; disconnecting\n", (fLogIPs ? strprintf("=%s", strNode) : ""), pnode->GetId());
# # # # #
# # # ]
3574 : 0 : pnode->fDisconnect = true;
3575 : 0 : return true;
3576 : : }
3577 : : return false;
3578 : 0 : }
3579 : :
3580 : 0 : bool CConnman::DisconnectNode(const CSubNet& subnet)
3581 : : {
3582 : 0 : bool disconnected = false;
3583 : 0 : LOCK(m_nodes_mutex);
3584 [ # # ]: 0 : for (CNode* pnode : m_nodes) {
3585 [ # # # # ]: 0 : if (subnet.Match(pnode->addr)) {
3586 [ # # # # : 0 : LogDebug(BCLog::NET, "disconnect by subnet%s matched peer=%d; disconnecting\n", (fLogIPs ? strprintf("=%s", subnet.ToString()) : ""), pnode->GetId());
# # # # #
# # # # #
# # # # ]
3587 : 0 : pnode->fDisconnect = true;
3588 : 0 : disconnected = true;
3589 : : }
3590 : : }
3591 [ # # ]: 0 : return disconnected;
3592 : 0 : }
3593 : :
3594 : 0 : bool CConnman::DisconnectNode(const CNetAddr& addr)
3595 : : {
3596 [ # # ]: 0 : return DisconnectNode(CSubNet(addr));
3597 : : }
3598 : :
3599 : 0 : bool CConnman::DisconnectNode(NodeId id)
3600 : : {
3601 : 0 : LOCK(m_nodes_mutex);
3602 [ # # ]: 0 : for(CNode* pnode : m_nodes) {
3603 [ # # ]: 0 : if (id == pnode->GetId()) {
3604 [ # # # # : 0 : LogDebug(BCLog::NET, "disconnect by id peer=%d; disconnecting\n", pnode->GetId());
# # ]
3605 : 0 : pnode->fDisconnect = true;
3606 : 0 : return true;
3607 : : }
3608 : : }
3609 : : return false;
3610 : 0 : }
3611 : :
3612 : 0 : void CConnman::RecordBytesRecv(uint64_t bytes)
3613 : : {
3614 : 0 : nTotalBytesRecv += bytes;
3615 : 0 : }
3616 : :
3617 : 0 : void CConnman::RecordBytesSent(uint64_t bytes)
3618 : : {
3619 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3620 : 0 : LOCK(m_total_bytes_sent_mutex);
3621 : :
3622 : 0 : nTotalBytesSent += bytes;
3623 : :
3624 : 0 : const auto now = GetTime<std::chrono::seconds>();
3625 [ # # ]: 0 : if (nMaxOutboundCycleStartTime + MAX_UPLOAD_TIMEFRAME < now)
3626 : : {
3627 : : // timeframe expired, reset cycle
3628 : 0 : nMaxOutboundCycleStartTime = now;
3629 : 0 : nMaxOutboundTotalBytesSentInCycle = 0;
3630 : : }
3631 : :
3632 [ # # ]: 0 : nMaxOutboundTotalBytesSentInCycle += bytes;
3633 : 0 : }
3634 : :
3635 : 0 : uint64_t CConnman::GetMaxOutboundTarget() const
3636 : : {
3637 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3638 : 0 : LOCK(m_total_bytes_sent_mutex);
3639 [ # # ]: 0 : return nMaxOutboundLimit;
3640 : 0 : }
3641 : :
3642 : 0 : std::chrono::seconds CConnman::GetMaxOutboundTimeframe() const
3643 : : {
3644 : 0 : return MAX_UPLOAD_TIMEFRAME;
3645 : : }
3646 : :
3647 : 0 : std::chrono::seconds CConnman::GetMaxOutboundTimeLeftInCycle() const
3648 : : {
3649 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3650 : 0 : LOCK(m_total_bytes_sent_mutex);
3651 [ # # ]: 0 : return GetMaxOutboundTimeLeftInCycle_();
3652 : 0 : }
3653 : :
3654 : 0 : std::chrono::seconds CConnman::GetMaxOutboundTimeLeftInCycle_() const
3655 : : {
3656 : 0 : AssertLockHeld(m_total_bytes_sent_mutex);
3657 : :
3658 [ # # ]: 0 : if (nMaxOutboundLimit == 0)
3659 : 0 : return 0s;
3660 : :
3661 [ # # ]: 0 : if (nMaxOutboundCycleStartTime.count() == 0)
3662 : 0 : return MAX_UPLOAD_TIMEFRAME;
3663 : :
3664 : 0 : const std::chrono::seconds cycleEndTime = nMaxOutboundCycleStartTime + MAX_UPLOAD_TIMEFRAME;
3665 : 0 : const auto now = GetTime<std::chrono::seconds>();
3666 [ # # ]: 0 : return (cycleEndTime < now) ? 0s : cycleEndTime - now;
3667 : : }
3668 : :
3669 : 0 : bool CConnman::OutboundTargetReached(bool historicalBlockServingLimit) const
3670 : : {
3671 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3672 : 0 : LOCK(m_total_bytes_sent_mutex);
3673 [ # # ]: 0 : if (nMaxOutboundLimit == 0)
3674 : : return false;
3675 : :
3676 [ # # ]: 0 : if (historicalBlockServingLimit)
3677 : : {
3678 : : // keep a large enough buffer to at least relay each block once
3679 [ # # ]: 0 : const std::chrono::seconds timeLeftInCycle = GetMaxOutboundTimeLeftInCycle_();
3680 : 0 : const uint64_t buffer = timeLeftInCycle / std::chrono::minutes{10} * MAX_BLOCK_SERIALIZED_SIZE;
3681 [ # # # # ]: 0 : if (buffer >= nMaxOutboundLimit || nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit - buffer)
3682 : 0 : return true;
3683 : : }
3684 [ # # ]: 0 : else if (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit)
3685 : 0 : return true;
3686 : :
3687 : : return false;
3688 : 0 : }
3689 : :
3690 : 0 : uint64_t CConnman::GetOutboundTargetBytesLeft() const
3691 : : {
3692 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3693 : 0 : LOCK(m_total_bytes_sent_mutex);
3694 [ # # ]: 0 : if (nMaxOutboundLimit == 0)
3695 : : return 0;
3696 : :
3697 [ # # ]: 0 : return (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit) ? 0 : nMaxOutboundLimit - nMaxOutboundTotalBytesSentInCycle;
3698 : 0 : }
3699 : :
3700 : 0 : uint64_t CConnman::GetTotalBytesRecv() const
3701 : : {
3702 : 0 : return nTotalBytesRecv;
3703 : : }
3704 : :
3705 : 0 : uint64_t CConnman::GetTotalBytesSent() const
3706 : : {
3707 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3708 : 0 : LOCK(m_total_bytes_sent_mutex);
3709 [ # # ]: 0 : return nTotalBytesSent;
3710 : 0 : }
3711 : :
3712 : 0 : ServiceFlags CConnman::GetLocalServices() const
3713 : : {
3714 : 0 : return m_local_services;
3715 : : }
3716 : :
3717 : 0 : static std::unique_ptr<Transport> MakeTransport(NodeId id, bool use_v2transport, bool inbound) noexcept
3718 : : {
3719 [ # # ]: 0 : if (use_v2transport) {
3720 [ # # ]: 0 : return std::make_unique<V2Transport>(id, /*initiating=*/!inbound);
3721 : : } else {
3722 [ # # ]: 0 : return std::make_unique<V1Transport>(id);
3723 : : }
3724 : : }
3725 : :
3726 : 0 : CNode::CNode(NodeId idIn,
3727 : : std::shared_ptr<Sock> sock,
3728 : : const CAddress& addrIn,
3729 : : uint64_t nKeyedNetGroupIn,
3730 : : uint64_t nLocalHostNonceIn,
3731 : : const CAddress& addrBindIn,
3732 : : const std::string& addrNameIn,
3733 : : ConnectionType conn_type_in,
3734 : : bool inbound_onion,
3735 : 0 : CNodeOptions&& node_opts)
3736 : 0 : : m_transport{MakeTransport(idIn, node_opts.use_v2transport, conn_type_in == ConnectionType::INBOUND)},
3737 : 0 : m_permission_flags{node_opts.permission_flags},
3738 [ # # ]: 0 : m_sock{sock},
3739 : 0 : m_connected{GetTime<std::chrono::seconds>()},
3740 : 0 : addr{addrIn},
3741 : 0 : addrBind{addrBindIn},
3742 [ # # # # : 0 : m_addr_name{addrNameIn.empty() ? addr.ToStringAddrPort() : addrNameIn},
# # ]
3743 [ # # ]: 0 : m_dest(addrNameIn),
3744 : 0 : m_inbound_onion{inbound_onion},
3745 [ # # ]: 0 : m_prefer_evict{node_opts.prefer_evict},
3746 : 0 : nKeyedNetGroup{nKeyedNetGroupIn},
3747 [ # # ]: 0 : m_conn_type{conn_type_in},
3748 : 0 : id{idIn},
3749 : 0 : nLocalHostNonce{nLocalHostNonceIn},
3750 [ # # ]: 0 : m_recv_flood_size{node_opts.recv_flood_size},
3751 [ # # # # : 0 : m_i2p_sam_session{std::move(node_opts.i2p_sam_session)}
# # ]
3752 : : {
3753 [ # # # # ]: 0 : if (inbound_onion) assert(conn_type_in == ConnectionType::INBOUND);
3754 : :
3755 [ # # ]: 0 : for (const auto& msg : ALL_NET_MESSAGE_TYPES) {
3756 [ # # ]: 0 : mapRecvBytesPerMsgType[msg] = 0;
3757 : : }
3758 [ # # ]: 0 : mapRecvBytesPerMsgType[NET_MESSAGE_TYPE_OTHER] = 0;
3759 : :
3760 [ # # ]: 0 : if (fLogIPs) {
3761 [ # # # # : 0 : LogDebug(BCLog::NET, "Added connection to %s peer=%d\n", m_addr_name, id);
# # ]
3762 : : } else {
3763 [ # # # # : 0 : LogDebug(BCLog::NET, "Added connection peer=%d\n", id);
# # ]
3764 : : }
3765 [ # # ]: 0 : }
3766 : :
3767 : 0 : void CNode::MarkReceivedMsgsForProcessing()
3768 : : {
3769 : 0 : AssertLockNotHeld(m_msg_process_queue_mutex);
3770 : :
3771 : 0 : size_t nSizeAdded = 0;
3772 [ # # ]: 0 : for (const auto& msg : vRecvMsg) {
3773 : : // vRecvMsg contains only completed CNetMessage
3774 : : // the single possible partially deserialized message are held by TransportDeserializer
3775 : 0 : nSizeAdded += msg.m_raw_message_size;
3776 : : }
3777 : :
3778 : 0 : LOCK(m_msg_process_queue_mutex);
3779 : 0 : m_msg_process_queue.splice(m_msg_process_queue.end(), vRecvMsg);
3780 : 0 : m_msg_process_queue_size += nSizeAdded;
3781 [ # # ]: 0 : fPauseRecv = m_msg_process_queue_size > m_recv_flood_size;
3782 : 0 : }
3783 : :
3784 : 0 : std::optional<std::pair<CNetMessage, bool>> CNode::PollMessage()
3785 : : {
3786 : 0 : LOCK(m_msg_process_queue_mutex);
3787 [ # # ]: 0 : if (m_msg_process_queue.empty()) return std::nullopt;
3788 : :
3789 : 0 : std::list<CNetMessage> msgs;
3790 : : // Just take one message
3791 : 0 : msgs.splice(msgs.begin(), m_msg_process_queue, m_msg_process_queue.begin());
3792 : 0 : m_msg_process_queue_size -= msgs.front().m_raw_message_size;
3793 : 0 : fPauseRecv = m_msg_process_queue_size > m_recv_flood_size;
3794 : :
3795 : 0 : return std::make_pair(std::move(msgs.front()), !m_msg_process_queue.empty());
3796 : 0 : }
3797 : :
3798 : 0 : bool CConnman::NodeFullyConnected(const CNode* pnode)
3799 : : {
3800 [ # # # # : 0 : return pnode && pnode->fSuccessfullyConnected && !pnode->fDisconnect;
# # ]
3801 : : }
3802 : :
3803 : 0 : void CConnman::PushMessage(CNode* pnode, CSerializedNetMsg&& msg)
3804 : : {
3805 : 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3806 : 0 : size_t nMessageSize = msg.data.size();
3807 [ # # ]: 0 : LogDebug(BCLog::NET, "sending %s (%d bytes) peer=%d\n", msg.m_type, nMessageSize, pnode->GetId());
3808 [ # # # # ]: 0 : if (gArgs.GetBoolArg("-capturemessages", false)) {
3809 : 0 : CaptureMessage(pnode->addr, msg.m_type, msg.data, /*is_incoming=*/false);
3810 : : }
3811 : :
3812 : : TRACE6(net, outbound_message,
3813 : : pnode->GetId(),
3814 : : pnode->m_addr_name.c_str(),
3815 : : pnode->ConnectionTypeAsString().c_str(),
3816 : : msg.m_type.c_str(),
3817 : : msg.data.size(),
3818 : : msg.data.data()
3819 : 0 : );
3820 : :
3821 : 0 : size_t nBytesSent = 0;
3822 : 0 : {
3823 : 0 : LOCK(pnode->cs_vSend);
3824 : : // Check if the transport still has unsent bytes, and indicate to it that we're about to
3825 : : // give it a message to send.
3826 [ # # ]: 0 : const auto& [to_send, more, _msg_type] =
3827 [ # # ]: 0 : pnode->m_transport->GetBytesToSend(/*have_next_message=*/true);
3828 [ # # # # ]: 0 : const bool queue_was_empty{to_send.empty() && pnode->vSendMsg.empty()};
3829 : :
3830 : : // Update memory usage of send buffer.
3831 : 0 : pnode->m_send_memusage += msg.GetMemoryUsage();
3832 [ # # ]: 0 : if (pnode->m_send_memusage + pnode->m_transport->GetSendMemoryUsage() > nSendBufferMaxSize) pnode->fPauseSend = true;
3833 : : // Move message to vSendMsg queue.
3834 [ # # ]: 0 : pnode->vSendMsg.push_back(std::move(msg));
3835 : :
3836 : : // If there was nothing to send before, and there is now (predicted by the "more" value
3837 : : // returned by the GetBytesToSend call above), attempt "optimistic write":
3838 : : // because the poll/select loop may pause for SELECT_TIMEOUT_MILLISECONDS before actually
3839 : : // doing a send, try sending from the calling thread if the queue was empty before.
3840 : : // With a V1Transport, more will always be true here, because adding a message always
3841 : : // results in sendable bytes there, but with V2Transport this is not the case (it may
3842 : : // still be in the handshake).
3843 [ # # # # ]: 0 : if (queue_was_empty && more) {
3844 [ # # ]: 0 : std::tie(nBytesSent, std::ignore) = SocketSendData(*pnode);
3845 : : }
3846 : 0 : }
3847 [ # # ]: 0 : if (nBytesSent) RecordBytesSent(nBytesSent);
3848 : 0 : }
3849 : :
3850 : 0 : bool CConnman::ForNode(NodeId id, std::function<bool(CNode* pnode)> func)
3851 : : {
3852 : 0 : CNode* found = nullptr;
3853 : 0 : LOCK(m_nodes_mutex);
3854 [ # # ]: 0 : for (auto&& pnode : m_nodes) {
3855 [ # # ]: 0 : if(pnode->GetId() == id) {
3856 : : found = pnode;
3857 : : break;
3858 : : }
3859 : : }
3860 [ # # # # : 0 : return found != nullptr && NodeFullyConnected(found) && func(found);
# # # # #
# # # ]
3861 : 0 : }
3862 : :
3863 : 0 : CSipHasher CConnman::GetDeterministicRandomizer(uint64_t id) const
3864 : : {
3865 : 0 : return CSipHasher(nSeed0, nSeed1).Write(id);
3866 : : }
3867 : :
3868 : 0 : uint64_t CConnman::CalculateKeyedNetGroup(const CAddress& address) const
3869 : : {
3870 : 0 : std::vector<unsigned char> vchNetGroup(m_netgroupman.GetGroup(address));
3871 : :
3872 [ # # # # : 0 : return GetDeterministicRandomizer(RANDOMIZER_ID_NETGROUP).Write(vchNetGroup).Finalize();
# # ]
3873 : 0 : }
3874 : :
3875 : 0 : void CConnman::PerformReconnections()
3876 : : {
3877 : 0 : AssertLockNotHeld(m_reconnections_mutex);
3878 : 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
3879 : 0 : while (true) {
3880 : : // Move first element of m_reconnections to todo (avoiding an allocation inside the lock).
3881 [ # # ]: 0 : decltype(m_reconnections) todo;
3882 : 0 : {
3883 [ # # ]: 0 : LOCK(m_reconnections_mutex);
3884 [ # # ]: 0 : if (m_reconnections.empty()) break;
3885 [ # # ]: 0 : todo.splice(todo.end(), m_reconnections, m_reconnections.begin());
3886 : 0 : }
3887 : :
3888 [ # # ]: 0 : auto& item = *todo.begin();
3889 : 0 : OpenNetworkConnection(item.addr_connect,
3890 : : // We only reconnect if the first attempt to connect succeeded at
3891 : : // connection time, but then failed after the CNode object was
3892 : : // created. Since we already know connecting is possible, do not
3893 : : // count failure to reconnect.
3894 : : /*fCountFailure=*/false,
3895 [ # # ]: 0 : std::move(item.grant),
3896 : 0 : item.destination.empty() ? nullptr : item.destination.c_str(),
3897 : : item.conn_type,
3898 [ # # ]: 0 : item.use_v2transport);
3899 : 0 : }
3900 : 0 : }
3901 : :
3902 : 0 : void CConnman::ASMapHealthCheck()
3903 : : {
3904 : 0 : const std::vector<CAddress> v4_addrs{GetAddresses(/*max_addresses=*/ 0, /*max_pct=*/ 0, Network::NET_IPV4, /*filtered=*/ false)};
3905 [ # # ]: 0 : const std::vector<CAddress> v6_addrs{GetAddresses(/*max_addresses=*/ 0, /*max_pct=*/ 0, Network::NET_IPV6, /*filtered=*/ false)};
3906 : 0 : std::vector<CNetAddr> clearnet_addrs;
3907 [ # # ]: 0 : clearnet_addrs.reserve(v4_addrs.size() + v6_addrs.size());
3908 [ # # ]: 0 : std::transform(v4_addrs.begin(), v4_addrs.end(), std::back_inserter(clearnet_addrs),
3909 [ # # ]: 0 : [](const CAddress& addr) { return static_cast<CNetAddr>(addr); });
3910 [ # # ]: 0 : std::transform(v6_addrs.begin(), v6_addrs.end(), std::back_inserter(clearnet_addrs),
3911 [ # # ]: 0 : [](const CAddress& addr) { return static_cast<CNetAddr>(addr); });
3912 [ # # ]: 0 : m_netgroupman.ASMapHealthCheck(clearnet_addrs);
3913 : 0 : }
3914 : :
3915 : : // Dump binary message to file, with timestamp.
3916 : 0 : static void CaptureMessageToFile(const CAddress& addr,
3917 : : const std::string& msg_type,
3918 : : Span<const unsigned char> data,
3919 : : bool is_incoming)
3920 : : {
3921 : : // Note: This function captures the message at the time of processing,
3922 : : // not at socket receive/send time.
3923 : : // This ensures that the messages are always in order from an application
3924 : : // layer (processing) perspective.
3925 : 0 : auto now = GetTime<std::chrono::microseconds>();
3926 : :
3927 : : // Windows folder names cannot include a colon
3928 : 0 : std::string clean_addr = addr.ToStringAddrPort();
3929 : 0 : std::replace(clean_addr.begin(), clean_addr.end(), ':', '_');
3930 : :
3931 [ # # # # : 0 : fs::path base_path = gArgs.GetDataDirNet() / "message_capture" / fs::u8path(clean_addr);
# # ]
3932 [ # # ]: 0 : fs::create_directories(base_path);
3933 : :
3934 [ # # # # ]: 0 : fs::path path = base_path / (is_incoming ? "msgs_recv.dat" : "msgs_sent.dat");
3935 [ # # # # ]: 0 : AutoFile f{fsbridge::fopen(path, "ab")};
3936 : :
3937 [ # # ]: 0 : ser_writedata64(f, now.count());
3938 [ # # ]: 0 : f << Span{msg_type};
3939 [ # # ]: 0 : for (auto i = msg_type.length(); i < CMessageHeader::COMMAND_SIZE; ++i) {
3940 [ # # ]: 0 : f << uint8_t{'\0'};
3941 : : }
3942 [ # # ]: 0 : uint32_t size = data.size();
3943 [ # # ]: 0 : ser_writedata32(f, size);
3944 [ # # ]: 0 : f << data;
3945 : 0 : }
3946 : :
3947 : : std::function<void(const CAddress& addr,
3948 : : const std::string& msg_type,
3949 : : Span<const unsigned char> data,
3950 : : bool is_incoming)>
3951 : : CaptureMessage = CaptureMessageToFile;
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