Line data Source code
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 : #if defined(HAVE_CONFIG_H)
7 : #include <config/bitcoin-config.h>
8 : #endif
9 :
10 : #include <net.h>
11 :
12 : #include <addrdb.h>
13 : #include <addrman.h>
14 : #include <banman.h>
15 : #include <clientversion.h>
16 : #include <common/args.h>
17 2 : #include <compat/compat.h>
18 2 : #include <consensus/consensus.h>
19 : #include <crypto/sha256.h>
20 : #include <i2p.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 <cstdint>
51 : #include <functional>
52 : #include <optional>
53 : #include <unordered_map>
54 :
55 : #include <math.h>
56 :
57 : /** Maximum number of block-relay-only anchor connections */
58 : static constexpr size_t MAX_BLOCK_RELAY_ONLY_ANCHORS = 2;
59 : 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.");
60 : /** Anchor IP address database file name */
61 : const char* const ANCHORS_DATABASE_FILENAME = "anchors.dat";
62 :
63 : // How often to dump addresses to peers.dat
64 : static constexpr std::chrono::minutes DUMP_PEERS_INTERVAL{15};
65 :
66 : /** Number of DNS seeds to query when the number of connections is low. */
67 : static constexpr int DNSSEEDS_TO_QUERY_AT_ONCE = 3;
68 :
69 : /** How long to delay before querying DNS seeds
70 : *
71 : * If we have more than THRESHOLD entries in addrman, then it's likely
72 : * that we got those addresses from having previously connected to the P2P
73 : * network, and that we'll be able to successfully reconnect to the P2P
74 2 : * network via contacting one of them. So if that's the case, spend a
75 : * little longer trying to connect to known peers before querying the
76 : * DNS seeds.
77 : */
78 : static constexpr std::chrono::seconds DNSSEEDS_DELAY_FEW_PEERS{11};
79 : static constexpr std::chrono::minutes DNSSEEDS_DELAY_MANY_PEERS{5};
80 : static constexpr int DNSSEEDS_DELAY_PEER_THRESHOLD = 1000; // "many" vs "few" peers
81 :
82 : /** The default timeframe for -maxuploadtarget. 1 day. */
83 2 : static constexpr std::chrono::seconds MAX_UPLOAD_TIMEFRAME{60 * 60 * 24};
84 :
85 : // A random time period (0 to 1 seconds) is added to feeler connections to prevent synchronization.
86 : static constexpr auto FEELER_SLEEP_WINDOW{1s};
87 :
88 : /** Frequency to attempt extra connections to reachable networks we're not connected to yet **/
89 : static constexpr auto EXTRA_NETWORK_PEER_INTERVAL{5min};
90 :
91 : /** Used to pass flags to the Bind() function */
92 : enum BindFlags {
93 : BF_NONE = 0,
94 : BF_REPORT_ERROR = (1U << 0),
95 : /**
96 : * Do not call AddLocal() for our special addresses, e.g., for incoming
97 : * Tor connections, to prevent gossiping them over the network.
98 : */
99 : BF_DONT_ADVERTISE = (1U << 1),
100 : };
101 :
102 : // The set of sockets cannot be modified while waiting
103 : // The sleep time needs to be small to avoid new sockets stalling
104 : static const uint64_t SELECT_TIMEOUT_MILLISECONDS = 50;
105 :
106 2 : const std::string NET_MESSAGE_TYPE_OTHER = "*other*";
107 :
108 : static const uint64_t RANDOMIZER_ID_NETGROUP = 0x6c0edd8036ef4036ULL; // SHA256("netgroup")[0:8]
109 : static const uint64_t RANDOMIZER_ID_LOCALHOSTNONCE = 0xd93e69e2bbfa5735ULL; // SHA256("localhostnonce")[0:8]
110 : static const uint64_t RANDOMIZER_ID_ADDRCACHE = 0x1cf2e4ddd306dda9ULL; // SHA256("addrcache")[0:8]
111 : //
112 : // Global state variables
113 : //
114 : bool fDiscover = true;
115 : bool fListen = true;
116 : GlobalMutex g_maplocalhost_mutex;
117 2 : std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(g_maplocalhost_mutex);
118 : static bool vfLimited[NET_MAX] GUARDED_BY(g_maplocalhost_mutex) = {};
119 2 : std::string strSubVersion;
120 :
121 0 : size_t CSerializedNetMsg::GetMemoryUsage() const noexcept
122 : {
123 : // Don't count the dynamic memory used for the m_type string, by assuming it fits in the
124 : // "small string" optimization area (which stores data inside the object itself, up to some
125 : // size; 15 bytes in modern libstdc++).
126 0 : return sizeof(*this) + memusage::DynamicUsage(data);
127 : }
128 :
129 0 : void CConnman::AddAddrFetch(const std::string& strDest)
130 : {
131 0 : LOCK(m_addr_fetches_mutex);
132 0 : m_addr_fetches.push_back(strDest);
133 0 : }
134 :
135 0 : uint16_t GetListenPort()
136 : {
137 : // If -bind= is provided with ":port" part, use that (first one if multiple are provided).
138 0 : for (const std::string& bind_arg : gArgs.GetArgs("-bind")) {
139 0 : constexpr uint16_t dummy_port = 0;
140 :
141 0 : const std::optional<CService> bind_addr{Lookup(bind_arg, dummy_port, /*fAllowLookup=*/false)};
142 0 : if (bind_addr.has_value() && bind_addr->GetPort() != dummy_port) return bind_addr->GetPort();
143 0 : }
144 :
145 : // Otherwise, if -whitebind= without NetPermissionFlags::NoBan is provided, use that
146 : // (-whitebind= is required to have ":port").
147 0 : for (const std::string& whitebind_arg : gArgs.GetArgs("-whitebind")) {
148 0 : NetWhitebindPermissions whitebind;
149 0 : bilingual_str error;
150 0 : if (NetWhitebindPermissions::TryParse(whitebind_arg, whitebind, error)) {
151 0 : if (!NetPermissions::HasFlag(whitebind.m_flags, NetPermissionFlags::NoBan)) {
152 0 : return whitebind.m_service.GetPort();
153 : }
154 0 : }
155 0 : }
156 :
157 : // Otherwise, if -port= is provided, use that. Otherwise use the default port.
158 0 : return static_cast<uint16_t>(gArgs.GetIntArg("-port", Params().GetDefaultPort()));
159 0 : }
160 :
161 : // Determine the "best" local address for a particular peer.
162 0 : [[nodiscard]] static std::optional<CService> GetLocal(const CNode& peer)
163 : {
164 0 : if (!fListen) return std::nullopt;
165 :
166 0 : std::optional<CService> addr;
167 0 : int nBestScore = -1;
168 0 : int nBestReachability = -1;
169 : {
170 0 : LOCK(g_maplocalhost_mutex);
171 0 : for (const auto& [local_addr, local_service_info] : mapLocalHost) {
172 : // For privacy reasons, don't advertise our privacy-network address
173 : // to other networks and don't advertise our other-network address
174 : // to privacy networks.
175 0 : if (local_addr.GetNetwork() != peer.ConnectedThroughNetwork()
176 0 : && (local_addr.IsPrivacyNet() || peer.IsConnectedThroughPrivacyNet())) {
177 0 : continue;
178 : }
179 0 : const int nScore{local_service_info.nScore};
180 0 : const int nReachability{local_addr.GetReachabilityFrom(peer.addr)};
181 0 : if (nReachability > nBestReachability || (nReachability == nBestReachability && nScore > nBestScore)) {
182 0 : addr.emplace(CService{local_addr, local_service_info.nPort});
183 0 : nBestReachability = nReachability;
184 0 : nBestScore = nScore;
185 0 : }
186 : }
187 0 : }
188 0 : return addr;
189 0 : }
190 :
191 : //! Convert the serialized seeds into usable address objects.
192 0 : static std::vector<CAddress> ConvertSeeds(const std::vector<uint8_t> &vSeedsIn)
193 : {
194 : // It'll only connect to one or two seed nodes because once it connects,
195 : // it'll get a pile of addresses with newer timestamps.
196 : // Seed nodes are given a random 'last seen time' of between one and two
197 : // weeks ago.
198 0 : const auto one_week{7 * 24h};
199 0 : std::vector<CAddress> vSeedsOut;
200 0 : FastRandomContext rng;
201 0 : DataStream underlying_stream{vSeedsIn};
202 0 : ParamsStream s{CAddress::V2_NETWORK, underlying_stream};
203 0 : while (!s.eof()) {
204 0 : CService endpoint;
205 0 : s >> endpoint;
206 0 : CAddress addr{endpoint, GetDesirableServiceFlags(NODE_NONE)};
207 0 : addr.nTime = rng.rand_uniform_delay(Now<NodeSeconds>() - one_week, -one_week);
208 0 : LogPrint(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 0 : }
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 : IsReachable(addrLocal.GetNetwork());
236 0 : }
237 :
238 0 : std::optional<CService> GetLocalAddrForPeer(CNode& node)
239 : {
240 0 : CService addrLocal{GetLocalAddress(node)};
241 0 : if (gArgs.GetBoolArg("-addrmantest", false)) {
242 : // use IPv4 loopback during addrmantest
243 0 : addrLocal = CService(LookupNumeric("127.0.0.1", GetListenPort()));
244 0 : }
245 : // If discovery is enabled, sometimes give our peer the address it
246 : // tells us that it sees us as in case it has a better idea of our
247 : // address than we do.
248 0 : FastRandomContext rng;
249 0 : if (IsPeerAddrLocalGood(&node) && (!addrLocal.IsRoutable() ||
250 0 : rng.randbits((GetnScore(addrLocal) > LOCAL_MANUAL) ? 3 : 1) == 0))
251 : {
252 0 : if (node.IsInboundConn()) {
253 : // For inbound connections, assume both the address and the port
254 : // as seen from the peer.
255 0 : addrLocal = CService{node.GetAddrLocal()};
256 0 : } else {
257 : // For outbound connections, assume just the address as seen from
258 : // the peer and leave the port in `addrLocal` as returned by
259 : // `GetLocalAddress()` above. The peer has no way to observe our
260 : // listening port when we have initiated the connection.
261 0 : addrLocal.SetIP(node.GetAddrLocal());
262 : }
263 0 : }
264 0 : if (addrLocal.IsRoutable() || gArgs.GetBoolArg("-addrmantest", false))
265 : {
266 0 : LogPrint(BCLog::NET, "Advertising address %s to peer=%d\n", addrLocal.ToStringAddrPort(), node.GetId());
267 0 : return addrLocal;
268 : }
269 : // Address is unroutable. Don't advertise.
270 0 : return std::nullopt;
271 0 : }
272 :
273 : /**
274 : * If an IPv6 address belongs to the address range used by the CJDNS network and
275 : * the CJDNS network is reachable (-cjdnsreachable config is set), then change
276 : * the type from NET_IPV6 to NET_CJDNS.
277 : * @param[in] service Address to potentially convert.
278 : * @return a copy of `service` either unmodified or changed to CJDNS.
279 : */
280 0 : CService MaybeFlipIPv6toCJDNS(const CService& service)
281 : {
282 0 : CService ret{service};
283 0 : if (ret.IsIPv6() && ret.HasCJDNSPrefix() && IsReachable(NET_CJDNS)) {
284 0 : ret.m_net = NET_CJDNS;
285 0 : }
286 0 : return ret;
287 0 : }
288 :
289 : // learn a new local address
290 0 : bool AddLocal(const CService& addr_, int nScore)
291 : {
292 0 : CService addr{MaybeFlipIPv6toCJDNS(addr_)};
293 :
294 0 : if (!addr.IsRoutable())
295 0 : return false;
296 :
297 0 : if (!fDiscover && nScore < LOCAL_MANUAL)
298 0 : return false;
299 :
300 0 : if (!IsReachable(addr))
301 0 : return false;
302 :
303 0 : LogPrintf("AddLocal(%s,%i)\n", addr.ToStringAddrPort(), nScore);
304 :
305 : {
306 0 : LOCK(g_maplocalhost_mutex);
307 0 : const auto [it, is_newly_added] = mapLocalHost.emplace(addr, LocalServiceInfo());
308 0 : LocalServiceInfo &info = it->second;
309 0 : if (is_newly_added || nScore >= info.nScore) {
310 0 : info.nScore = nScore + (is_newly_added ? 0 : 1);
311 0 : info.nPort = addr.GetPort();
312 0 : }
313 0 : }
314 :
315 0 : return true;
316 0 : }
317 :
318 0 : bool AddLocal(const CNetAddr &addr, int nScore)
319 : {
320 0 : return AddLocal(CService(addr, GetListenPort()), nScore);
321 0 : }
322 :
323 0 : void RemoveLocal(const CService& addr)
324 : {
325 0 : LOCK(g_maplocalhost_mutex);
326 0 : LogPrintf("RemoveLocal(%s)\n", addr.ToStringAddrPort());
327 0 : mapLocalHost.erase(addr);
328 0 : }
329 :
330 0 : void SetReachable(enum Network net, bool reachable)
331 : {
332 0 : if (net == NET_UNROUTABLE || net == NET_INTERNAL)
333 0 : return;
334 0 : LOCK(g_maplocalhost_mutex);
335 0 : vfLimited[net] = !reachable;
336 0 : }
337 :
338 0 : bool IsReachable(enum Network net)
339 : {
340 0 : LOCK(g_maplocalhost_mutex);
341 0 : return !vfLimited[net];
342 0 : }
343 :
344 0 : bool IsReachable(const CNetAddr &addr)
345 : {
346 0 : return IsReachable(addr.GetNetwork());
347 : }
348 :
349 : /** vote for a local address */
350 0 : bool SeenLocal(const CService& addr)
351 : {
352 0 : LOCK(g_maplocalhost_mutex);
353 0 : const auto it = mapLocalHost.find(addr);
354 0 : if (it == mapLocalHost.end()) return false;
355 0 : ++it->second.nScore;
356 0 : return true;
357 0 : }
358 :
359 :
360 : /** check whether a given address is potentially local */
361 0 : bool IsLocal(const CService& addr)
362 : {
363 0 : LOCK(g_maplocalhost_mutex);
364 0 : return mapLocalHost.count(addr) > 0;
365 0 : }
366 :
367 0 : CNode* CConnman::FindNode(const CNetAddr& ip)
368 : {
369 0 : LOCK(m_nodes_mutex);
370 0 : for (CNode* pnode : m_nodes) {
371 0 : if (static_cast<CNetAddr>(pnode->addr) == ip) {
372 0 : return pnode;
373 : }
374 : }
375 0 : return nullptr;
376 0 : }
377 :
378 0 : CNode* CConnman::FindNode(const CSubNet& subNet)
379 : {
380 0 : LOCK(m_nodes_mutex);
381 0 : for (CNode* pnode : m_nodes) {
382 0 : if (subNet.Match(static_cast<CNetAddr>(pnode->addr))) {
383 0 : return pnode;
384 : }
385 : }
386 0 : return nullptr;
387 0 : }
388 :
389 0 : CNode* CConnman::FindNode(const std::string& addrName)
390 : {
391 0 : LOCK(m_nodes_mutex);
392 0 : for (CNode* pnode : m_nodes) {
393 0 : if (pnode->m_addr_name == addrName) {
394 0 : return pnode;
395 : }
396 : }
397 0 : return nullptr;
398 0 : }
399 :
400 0 : CNode* CConnman::FindNode(const CService& addr)
401 : {
402 0 : LOCK(m_nodes_mutex);
403 0 : for (CNode* pnode : m_nodes) {
404 0 : if (static_cast<CService>(pnode->addr) == addr) {
405 0 : return pnode;
406 : }
407 0 : }
408 0 : return nullptr;
409 0 : }
410 :
411 0 : bool CConnman::AlreadyConnectedToAddress(const CAddress& addr)
412 : {
413 0 : return FindNode(static_cast<CNetAddr>(addr)) || FindNode(addr.ToStringAddrPort());
414 0 : }
415 :
416 0 : bool CConnman::CheckIncomingNonce(uint64_t nonce)
417 : {
418 0 : LOCK(m_nodes_mutex);
419 0 : for (const CNode* pnode : m_nodes) {
420 0 : if (!pnode->fSuccessfullyConnected && !pnode->IsInboundConn() && pnode->GetLocalNonce() == nonce)
421 0 : return false;
422 : }
423 0 : return true;
424 0 : }
425 :
426 : /** Get the bind address for a socket as CAddress */
427 0 : static CAddress GetBindAddress(const Sock& sock)
428 : {
429 0 : CAddress addr_bind;
430 : struct sockaddr_storage sockaddr_bind;
431 0 : socklen_t sockaddr_bind_len = sizeof(sockaddr_bind);
432 0 : if (sock.Get() != INVALID_SOCKET) {
433 0 : if (!sock.GetSockName((struct sockaddr*)&sockaddr_bind, &sockaddr_bind_len)) {
434 0 : addr_bind.SetSockAddr((const struct sockaddr*)&sockaddr_bind);
435 0 : } else {
436 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Warning, "getsockname failed\n");
437 : }
438 0 : }
439 0 : return addr_bind;
440 0 : }
441 :
442 0 : CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure, ConnectionType conn_type)
443 : {
444 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
445 0 : assert(conn_type != ConnectionType::INBOUND);
446 :
447 0 : if (pszDest == nullptr) {
448 0 : if (IsLocal(addrConnect))
449 0 : return nullptr;
450 :
451 : // Look for an existing connection
452 0 : CNode* pnode = FindNode(static_cast<CService>(addrConnect));
453 0 : if (pnode)
454 : {
455 0 : LogPrintf("Failed to open new connection, already connected\n");
456 0 : return nullptr;
457 : }
458 0 : }
459 :
460 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Debug, "trying connection %s lastseen=%.1fhrs\n",
461 : pszDest ? pszDest : addrConnect.ToStringAddrPort(),
462 : Ticks<HoursDouble>(pszDest ? 0h : Now<NodeSeconds>() - addrConnect.nTime));
463 :
464 : // Resolve
465 0 : const uint16_t default_port{pszDest != nullptr ? GetDefaultPort(pszDest) :
466 0 : m_params.GetDefaultPort()};
467 0 : if (pszDest) {
468 0 : const std::vector<CService> resolved{Lookup(pszDest, default_port, fNameLookup && !HaveNameProxy(), 256)};
469 0 : if (!resolved.empty()) {
470 0 : const CService& rnd{resolved[GetRand(resolved.size())]};
471 0 : addrConnect = CAddress{MaybeFlipIPv6toCJDNS(rnd), NODE_NONE};
472 0 : if (!addrConnect.IsValid()) {
473 0 : LogPrint(BCLog::NET, "Resolver returned invalid address %s for %s\n", addrConnect.ToStringAddrPort(), pszDest);
474 0 : return nullptr;
475 : }
476 : // It is possible that we already have a connection to the IP/port pszDest resolved to.
477 : // In that case, drop the connection that was just created.
478 0 : LOCK(m_nodes_mutex);
479 0 : CNode* pnode = FindNode(static_cast<CService>(addrConnect));
480 0 : if (pnode) {
481 0 : LogPrintf("Failed to open new connection, already connected\n");
482 0 : return nullptr;
483 : }
484 0 : }
485 0 : }
486 :
487 : // Connect
488 0 : bool connected = false;
489 0 : std::unique_ptr<Sock> sock;
490 0 : Proxy proxy;
491 0 : CAddress addr_bind;
492 0 : assert(!addr_bind.IsValid());
493 0 : std::unique_ptr<i2p::sam::Session> i2p_transient_session;
494 :
495 0 : if (addrConnect.IsValid()) {
496 0 : const bool use_proxy{GetProxy(addrConnect.GetNetwork(), proxy)};
497 0 : bool proxyConnectionFailed = false;
498 :
499 0 : if (addrConnect.IsI2P() && use_proxy) {
500 0 : i2p::Connection conn;
501 :
502 0 : if (m_i2p_sam_session) {
503 0 : connected = m_i2p_sam_session->Connect(addrConnect, conn, proxyConnectionFailed);
504 0 : } else {
505 : {
506 0 : LOCK(m_unused_i2p_sessions_mutex);
507 0 : if (m_unused_i2p_sessions.empty()) {
508 0 : i2p_transient_session =
509 0 : std::make_unique<i2p::sam::Session>(proxy.proxy, &interruptNet);
510 0 : } else {
511 0 : i2p_transient_session.swap(m_unused_i2p_sessions.front());
512 0 : m_unused_i2p_sessions.pop();
513 : }
514 0 : }
515 0 : connected = i2p_transient_session->Connect(addrConnect, conn, proxyConnectionFailed);
516 0 : if (!connected) {
517 0 : LOCK(m_unused_i2p_sessions_mutex);
518 0 : if (m_unused_i2p_sessions.size() < MAX_UNUSED_I2P_SESSIONS_SIZE) {
519 0 : m_unused_i2p_sessions.emplace(i2p_transient_session.release());
520 0 : }
521 0 : }
522 : }
523 :
524 0 : if (connected) {
525 0 : sock = std::move(conn.sock);
526 0 : addr_bind = CAddress{conn.me, NODE_NONE};
527 0 : }
528 0 : } else if (use_proxy) {
529 0 : sock = CreateSock(proxy.proxy);
530 0 : if (!sock) {
531 0 : return nullptr;
532 : }
533 0 : connected = ConnectThroughProxy(proxy, addrConnect.ToStringAddr(), addrConnect.GetPort(),
534 0 : *sock, nConnectTimeout, proxyConnectionFailed);
535 0 : } else {
536 : // no proxy needed (none set for target network)
537 0 : sock = CreateSock(addrConnect);
538 0 : if (!sock) {
539 0 : return nullptr;
540 : }
541 0 : connected = ConnectSocketDirectly(addrConnect, *sock, nConnectTimeout,
542 0 : conn_type == ConnectionType::MANUAL);
543 : }
544 0 : if (!proxyConnectionFailed) {
545 : // If a connection to the node was attempted, and failure (if any) is not caused by a problem connecting to
546 : // the proxy, mark this as an attempt.
547 0 : addrman.Attempt(addrConnect, fCountFailure);
548 0 : }
549 0 : } else if (pszDest && GetNameProxy(proxy)) {
550 0 : sock = CreateSock(proxy.proxy);
551 0 : if (!sock) {
552 0 : return nullptr;
553 : }
554 0 : std::string host;
555 0 : uint16_t port{default_port};
556 0 : SplitHostPort(std::string(pszDest), port, host);
557 : bool proxyConnectionFailed;
558 0 : connected = ConnectThroughProxy(proxy, host, port, *sock, nConnectTimeout,
559 : proxyConnectionFailed);
560 0 : }
561 0 : if (!connected) {
562 0 : return nullptr;
563 : }
564 :
565 : // Add node
566 0 : NodeId id = GetNewNodeId();
567 0 : uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
568 0 : if (!addr_bind.IsValid()) {
569 0 : addr_bind = GetBindAddress(*sock);
570 0 : }
571 0 : CNode* pnode = new CNode(id,
572 0 : std::move(sock),
573 : addrConnect,
574 0 : CalculateKeyedNetGroup(addrConnect),
575 0 : nonce,
576 : addr_bind,
577 0 : pszDest ? pszDest : "",
578 0 : conn_type,
579 : /*inbound_onion=*/false,
580 0 : CNodeOptions{
581 0 : .i2p_sam_session = std::move(i2p_transient_session),
582 0 : .recv_flood_size = nReceiveFloodSize,
583 0 : });
584 0 : pnode->AddRef();
585 :
586 : // We're making a new connection, harvest entropy from the time (and our peer count)
587 0 : RandAddEvent((uint32_t)id);
588 :
589 0 : return pnode;
590 0 : }
591 :
592 0 : void CNode::CloseSocketDisconnect()
593 : {
594 0 : fDisconnect = true;
595 0 : LOCK(m_sock_mutex);
596 0 : if (m_sock) {
597 0 : LogPrint(BCLog::NET, "disconnecting peer=%d\n", id);
598 0 : m_sock.reset();
599 0 : }
600 0 : m_i2p_sam_session.reset();
601 0 : }
602 :
603 0 : void CConnman::AddWhitelistPermissionFlags(NetPermissionFlags& flags, const CNetAddr &addr) const {
604 0 : for (const auto& subnet : vWhitelistedRange) {
605 0 : if (subnet.m_subnet.Match(addr)) NetPermissions::AddFlag(flags, subnet.m_flags);
606 : }
607 0 : }
608 :
609 0 : CService CNode::GetAddrLocal() const
610 : {
611 0 : AssertLockNotHeld(m_addr_local_mutex);
612 0 : LOCK(m_addr_local_mutex);
613 0 : return addrLocal;
614 0 : }
615 :
616 0 : void CNode::SetAddrLocal(const CService& addrLocalIn) {
617 0 : AssertLockNotHeld(m_addr_local_mutex);
618 0 : LOCK(m_addr_local_mutex);
619 0 : if (addrLocal.IsValid()) {
620 0 : error("Addr local already set for node: %i. Refusing to change from %s to %s", id, addrLocal.ToStringAddrPort(), addrLocalIn.ToStringAddrPort());
621 0 : } else {
622 0 : addrLocal = addrLocalIn;
623 : }
624 0 : }
625 :
626 0 : Network CNode::ConnectedThroughNetwork() const
627 : {
628 0 : return m_inbound_onion ? NET_ONION : addr.GetNetClass();
629 : }
630 :
631 0 : bool CNode::IsConnectedThroughPrivacyNet() const
632 : {
633 0 : return m_inbound_onion || addr.IsPrivacyNet();
634 : }
635 :
636 : #undef X
637 : #define X(name) stats.name = name
638 0 : void CNode::CopyStats(CNodeStats& stats)
639 : {
640 0 : stats.nodeid = this->GetId();
641 0 : X(addr);
642 0 : X(addrBind);
643 0 : stats.m_network = ConnectedThroughNetwork();
644 0 : X(m_last_send);
645 0 : X(m_last_recv);
646 0 : X(m_last_tx_time);
647 0 : X(m_last_block_time);
648 0 : X(m_connected);
649 0 : X(nTimeOffset);
650 0 : X(m_addr_name);
651 0 : X(nVersion);
652 : {
653 0 : LOCK(m_subver_mutex);
654 0 : X(cleanSubVer);
655 0 : }
656 0 : stats.fInbound = IsInboundConn();
657 0 : X(m_bip152_highbandwidth_to);
658 0 : X(m_bip152_highbandwidth_from);
659 : {
660 0 : LOCK(cs_vSend);
661 0 : X(mapSendBytesPerMsgType);
662 0 : X(nSendBytes);
663 0 : }
664 : {
665 0 : LOCK(cs_vRecv);
666 0 : X(mapRecvBytesPerMsgType);
667 0 : X(nRecvBytes);
668 0 : }
669 0 : X(m_permission_flags);
670 :
671 0 : X(m_last_ping_time);
672 0 : X(m_min_ping_time);
673 :
674 : // Leave string empty if addrLocal invalid (not filled in yet)
675 0 : CService addrLocalUnlocked = GetAddrLocal();
676 0 : stats.addrLocal = addrLocalUnlocked.IsValid() ? addrLocalUnlocked.ToStringAddrPort() : "";
677 :
678 0 : X(m_conn_type);
679 0 : }
680 : #undef X
681 :
682 0 : bool CNode::ReceiveMsgBytes(Span<const uint8_t> msg_bytes, bool& complete)
683 : {
684 0 : complete = false;
685 0 : const auto time = GetTime<std::chrono::microseconds>();
686 0 : LOCK(cs_vRecv);
687 0 : m_last_recv = std::chrono::duration_cast<std::chrono::seconds>(time);
688 0 : nRecvBytes += msg_bytes.size();
689 0 : while (msg_bytes.size() > 0) {
690 : // absorb network data
691 0 : if (!m_transport->ReceivedBytes(msg_bytes)) {
692 : // Serious transport problem, disconnect from the peer.
693 0 : return false;
694 : }
695 0 :
696 0 : if (m_transport->ReceivedMessageComplete()) {
697 0 : // decompose a transport agnostic CNetMessage from the deserializer
698 0 : bool reject_message{false};
699 0 : CNetMessage msg = m_transport->GetReceivedMessage(time, reject_message);
700 0 : if (reject_message) {
701 0 : // Message deserialization failed. Drop the message but don't disconnect the peer.
702 : // store the size of the corrupt message
703 0 : mapRecvBytesPerMsgType.at(NET_MESSAGE_TYPE_OTHER) += msg.m_raw_message_size;
704 0 : continue;
705 : }
706 :
707 : // Store received bytes per message type.
708 : // To prevent a memory DOS, only allow known message types.
709 0 : auto i = mapRecvBytesPerMsgType.find(msg.m_type);
710 0 : if (i == mapRecvBytesPerMsgType.end()) {
711 0 : i = mapRecvBytesPerMsgType.find(NET_MESSAGE_TYPE_OTHER);
712 0 : }
713 0 : assert(i != mapRecvBytesPerMsgType.end());
714 0 : i->second += msg.m_raw_message_size;
715 0 :
716 : // push the message to the process queue,
717 0 : vRecvMsg.push_back(std::move(msg));
718 :
719 0 : complete = true;
720 0 : }
721 0 : }
722 :
723 0 : return true;
724 0 : }
725 :
726 0 : V1Transport::V1Transport(const NodeId node_id, int nTypeIn, int nVersionIn) noexcept :
727 0 : m_node_id(node_id), hdrbuf(nTypeIn, nVersionIn), vRecv(nTypeIn, nVersionIn)
728 0 : {
729 0 : assert(std::size(Params().MessageStart()) == std::size(m_magic_bytes));
730 0 : m_magic_bytes = Params().MessageStart();
731 0 : LOCK(m_recv_mutex);
732 0 : Reset();
733 0 : }
734 :
735 0 : int V1Transport::readHeader(Span<const uint8_t> msg_bytes)
736 : {
737 0 : AssertLockHeld(m_recv_mutex);
738 : // copy data to temporary parsing buffer
739 0 : unsigned int nRemaining = CMessageHeader::HEADER_SIZE - nHdrPos;
740 0 : unsigned int nCopy = std::min<unsigned int>(nRemaining, msg_bytes.size());
741 :
742 0 : memcpy(&hdrbuf[nHdrPos], msg_bytes.data(), nCopy);
743 0 : nHdrPos += nCopy;
744 :
745 : // if header incomplete, exit
746 0 : if (nHdrPos < CMessageHeader::HEADER_SIZE)
747 0 : return nCopy;
748 :
749 : // deserialize to CMessageHeader
750 : try {
751 0 : hdrbuf >> hdr;
752 0 : }
753 : catch (const std::exception&) {
754 0 : LogPrint(BCLog::NET, "Header error: Unable to deserialize, peer=%d\n", m_node_id);
755 0 : return -1;
756 0 : }
757 :
758 : // Check start string, network magic
759 0 : if (hdr.pchMessageStart != m_magic_bytes) {
760 0 : LogPrint(BCLog::NET, "Header error: Wrong MessageStart %s received, peer=%d\n", HexStr(hdr.pchMessageStart), m_node_id);
761 0 : return -1;
762 : }
763 :
764 : // reject messages larger than MAX_SIZE or MAX_PROTOCOL_MESSAGE_LENGTH
765 0 : if (hdr.nMessageSize > MAX_SIZE || hdr.nMessageSize > MAX_PROTOCOL_MESSAGE_LENGTH) {
766 0 : LogPrint(BCLog::NET, "Header error: Size too large (%s, %u bytes), peer=%d\n", SanitizeString(hdr.GetCommand()), hdr.nMessageSize, m_node_id);
767 0 : return -1;
768 : }
769 :
770 : // switch state to reading message data
771 0 : in_data = true;
772 :
773 0 : return nCopy;
774 0 : }
775 :
776 0 : int V1Transport::readData(Span<const uint8_t> msg_bytes)
777 : {
778 0 : AssertLockHeld(m_recv_mutex);
779 0 : unsigned int nRemaining = hdr.nMessageSize - nDataPos;
780 0 : unsigned int nCopy = std::min<unsigned int>(nRemaining, msg_bytes.size());
781 :
782 0 : if (vRecv.size() < nDataPos + nCopy) {
783 : // Allocate up to 256 KiB ahead, but never more than the total message size.
784 0 : vRecv.resize(std::min(hdr.nMessageSize, nDataPos + nCopy + 256 * 1024));
785 0 : }
786 :
787 0 : hasher.Write(msg_bytes.first(nCopy));
788 0 : memcpy(&vRecv[nDataPos], msg_bytes.data(), nCopy);
789 0 : nDataPos += nCopy;
790 :
791 0 : return nCopy;
792 : }
793 :
794 0 : const uint256& V1Transport::GetMessageHash() const
795 : {
796 0 : AssertLockHeld(m_recv_mutex);
797 0 : assert(CompleteInternal());
798 0 : if (data_hash.IsNull())
799 0 : hasher.Finalize(data_hash);
800 0 : return data_hash;
801 : }
802 :
803 0 : CNetMessage V1Transport::GetReceivedMessage(const std::chrono::microseconds time, bool& reject_message)
804 : {
805 0 : AssertLockNotHeld(m_recv_mutex);
806 : // Initialize out parameter
807 0 : reject_message = false;
808 : // decompose a single CNetMessage from the TransportDeserializer
809 0 : LOCK(m_recv_mutex);
810 0 : CNetMessage msg(std::move(vRecv));
811 :
812 : // store message type string, time, and sizes
813 0 : msg.m_type = hdr.GetCommand();
814 0 : msg.m_time = time;
815 0 : msg.m_message_size = hdr.nMessageSize;
816 0 : msg.m_raw_message_size = hdr.nMessageSize + CMessageHeader::HEADER_SIZE;
817 :
818 0 : uint256 hash = GetMessageHash();
819 :
820 : // We just received a message off the wire, harvest entropy from the time (and the message checksum)
821 0 : RandAddEvent(ReadLE32(hash.begin()));
822 :
823 : // Check checksum and header message type string
824 0 : if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0) {
825 0 : LogPrint(BCLog::NET, "Header error: Wrong checksum (%s, %u bytes), expected %s was %s, peer=%d\n",
826 : SanitizeString(msg.m_type), msg.m_message_size,
827 : HexStr(Span{hash}.first(CMessageHeader::CHECKSUM_SIZE)),
828 : HexStr(hdr.pchChecksum),
829 : m_node_id);
830 0 : reject_message = true;
831 0 : } else if (!hdr.IsCommandValid()) {
832 0 : LogPrint(BCLog::NET, "Header error: Invalid message type (%s, %u bytes), peer=%d\n",
833 : SanitizeString(hdr.GetCommand()), msg.m_message_size, m_node_id);
834 0 : reject_message = true;
835 0 : }
836 :
837 : // Always reset the network deserializer (prepare for the next message)
838 0 : Reset();
839 0 : return msg;
840 0 : }
841 0 :
842 0 : bool V1Transport::SetMessageToSend(CSerializedNetMsg& msg) noexcept
843 : {
844 0 : AssertLockNotHeld(m_send_mutex);
845 : // Determine whether a new message can be set.
846 0 : LOCK(m_send_mutex);
847 0 : if (m_sending_header || m_bytes_sent < m_message_to_send.data.size()) return false;
848 0 :
849 : // create dbl-sha256 checksum
850 0 : uint256 hash = Hash(msg.data);
851 :
852 0 : // create header
853 0 : CMessageHeader hdr(m_magic_bytes, msg.m_type.c_str(), msg.data.size());
854 0 : memcpy(hdr.pchChecksum, hash.begin(), CMessageHeader::CHECKSUM_SIZE);
855 :
856 : // serialize header
857 0 : m_header_to_send.clear();
858 0 : CVectorWriter{SER_NETWORK, INIT_PROTO_VERSION, m_header_to_send, 0, hdr};
859 0 :
860 : // update state
861 0 : m_message_to_send = std::move(msg);
862 0 : m_sending_header = true;
863 0 : m_bytes_sent = 0;
864 0 : return true;
865 0 : }
866 :
867 0 : Transport::BytesToSend V1Transport::GetBytesToSend(bool have_next_message) const noexcept
868 0 : {
869 0 : AssertLockNotHeld(m_send_mutex);
870 0 : LOCK(m_send_mutex);
871 0 : if (m_sending_header) {
872 0 : return {Span{m_header_to_send}.subspan(m_bytes_sent),
873 : // We have more to send after the header if the message has payload, or if there
874 : // is a next message after that.
875 0 : have_next_message || !m_message_to_send.data.empty(),
876 0 : m_message_to_send.m_type
877 : };
878 : } else {
879 0 : return {Span{m_message_to_send.data}.subspan(m_bytes_sent),
880 : // We only have more to send after this message's payload if there is another
881 : // message.
882 : have_next_message,
883 0 : m_message_to_send.m_type
884 : };
885 : }
886 0 : }
887 :
888 0 : void V1Transport::MarkBytesSent(size_t bytes_sent) noexcept
889 : {
890 0 : AssertLockNotHeld(m_send_mutex);
891 0 : LOCK(m_send_mutex);
892 0 : m_bytes_sent += bytes_sent;
893 0 : if (m_sending_header && m_bytes_sent == m_header_to_send.size()) {
894 : // We're done sending a message's header. Switch to sending its data bytes.
895 0 : m_sending_header = false;
896 0 : m_bytes_sent = 0;
897 0 : } else if (!m_sending_header && m_bytes_sent == m_message_to_send.data.size()) {
898 : // We're done sending a message's data. Wipe the data vector to reduce memory consumption.
899 0 : ClearShrink(m_message_to_send.data);
900 0 : m_bytes_sent = 0;
901 0 : }
902 0 : }
903 :
904 0 : size_t V1Transport::GetSendMemoryUsage() const noexcept
905 : {
906 0 : AssertLockNotHeld(m_send_mutex);
907 0 : LOCK(m_send_mutex);
908 : // Don't count sending-side fields besides m_message_to_send, as they're all small and bounded.
909 0 : return m_message_to_send.GetMemoryUsage();
910 0 : }
911 :
912 : namespace {
913 :
914 : /** List of short messages as defined in BIP324, in order.
915 : *
916 : * Only message types that are actually implemented in this codebase need to be listed, as other
917 : * messages get ignored anyway - whether we know how to decode them or not.
918 : */
919 2 : const std::array<std::string, 33> V2_MESSAGE_IDS = {
920 2 : "", // 12 bytes follow encoding the message type like in V1
921 2 : NetMsgType::ADDR,
922 2 : NetMsgType::BLOCK,
923 2 : NetMsgType::BLOCKTXN,
924 2 : NetMsgType::CMPCTBLOCK,
925 2 : NetMsgType::FEEFILTER,
926 2 : NetMsgType::FILTERADD,
927 2 : NetMsgType::FILTERCLEAR,
928 2 : NetMsgType::FILTERLOAD,
929 2 : NetMsgType::GETBLOCKS,
930 2 : NetMsgType::GETBLOCKTXN,
931 2 : NetMsgType::GETDATA,
932 2 : NetMsgType::GETHEADERS,
933 2 : NetMsgType::HEADERS,
934 2 : NetMsgType::INV,
935 2 : NetMsgType::MEMPOOL,
936 2 : NetMsgType::MERKLEBLOCK,
937 2 : NetMsgType::NOTFOUND,
938 2 : NetMsgType::PING,
939 2 : NetMsgType::PONG,
940 2 : NetMsgType::SENDCMPCT,
941 2 : NetMsgType::TX,
942 2 : NetMsgType::GETCFILTERS,
943 2 : NetMsgType::CFILTER,
944 2 : NetMsgType::GETCFHEADERS,
945 2 : NetMsgType::CFHEADERS,
946 2 : NetMsgType::GETCFCHECKPT,
947 2 : NetMsgType::CFCHECKPT,
948 2 : NetMsgType::ADDRV2,
949 : // Unimplemented message types that are assigned in BIP324:
950 2 : "",
951 2 : "",
952 2 : "",
953 2 : ""
954 : };
955 :
956 : class V2MessageMap
957 : {
958 : std::unordered_map<std::string, uint8_t> m_map;
959 0 :
960 : public:
961 2 : V2MessageMap() noexcept
962 : {
963 66 : for (size_t i = 1; i < std::size(V2_MESSAGE_IDS); ++i) {
964 64 : m_map.emplace(V2_MESSAGE_IDS[i], i);
965 64 : }
966 2 : }
967 :
968 0 : std::optional<uint8_t> operator()(const std::string& message_name) const noexcept
969 : {
970 0 : auto it = m_map.find(message_name);
971 0 : if (it == m_map.end()) return std::nullopt;
972 0 : return it->second;
973 0 : }
974 : };
975 :
976 2 : const V2MessageMap V2_MESSAGE_MAP;
977 :
978 0 : CKey GenerateRandomKey() noexcept
979 : {
980 0 : CKey key;
981 0 : key.MakeNewKey(/*fCompressed=*/true);
982 0 : return key;
983 0 : }
984 :
985 0 : std::vector<uint8_t> GenerateRandomGarbage() noexcept
986 : {
987 0 : std::vector<uint8_t> ret;
988 0 : FastRandomContext rng;
989 0 : ret.resize(rng.randrange(V2Transport::MAX_GARBAGE_LEN + 1));
990 0 : rng.fillrand(MakeWritableByteSpan(ret));
991 0 : return ret;
992 0 : }
993 :
994 : } // namespace
995 :
996 0 : void V2Transport::StartSendingHandshake() noexcept
997 : {
998 0 : AssertLockHeld(m_send_mutex);
999 0 : Assume(m_send_state == SendState::AWAITING_KEY);
1000 0 : Assume(m_send_buffer.empty());
1001 : // Initialize the send buffer with ellswift pubkey + provided garbage.
1002 0 : m_send_buffer.resize(EllSwiftPubKey::size() + m_send_garbage.size());
1003 0 : std::copy(std::begin(m_cipher.GetOurPubKey()), std::end(m_cipher.GetOurPubKey()), MakeWritableByteSpan(m_send_buffer).begin());
1004 0 : std::copy(m_send_garbage.begin(), m_send_garbage.end(), m_send_buffer.begin() + EllSwiftPubKey::size());
1005 : // We cannot wipe m_send_garbage as it will still be used to construct the garbage
1006 : // authentication packet.
1007 0 : }
1008 :
1009 0 : V2Transport::V2Transport(NodeId nodeid, bool initiating, int type_in, int version_in, const CKey& key, Span<const std::byte> ent32, std::vector<uint8_t> garbage) noexcept :
1010 0 : m_cipher{key, ent32}, m_initiating{initiating}, m_nodeid{nodeid},
1011 0 : m_v1_fallback{nodeid, type_in, version_in}, m_recv_type{type_in}, m_recv_version{version_in},
1012 0 : m_recv_state{initiating ? RecvState::KEY : RecvState::KEY_MAYBE_V1},
1013 0 : m_send_garbage{std::move(garbage)},
1014 0 : m_send_state{initiating ? SendState::AWAITING_KEY : SendState::MAYBE_V1}
1015 0 : {
1016 0 : Assume(m_send_garbage.size() <= MAX_GARBAGE_LEN);
1017 : // Start sending immediately if we're the initiator of the connection.
1018 0 : if (initiating) {
1019 0 : LOCK(m_send_mutex);
1020 0 : StartSendingHandshake();
1021 0 : }
1022 0 : }
1023 :
1024 0 : V2Transport::V2Transport(NodeId nodeid, bool initiating, int type_in, int version_in) noexcept :
1025 0 : V2Transport{nodeid, initiating, type_in, version_in, GenerateRandomKey(),
1026 0 : MakeByteSpan(GetRandHash()), GenerateRandomGarbage()} { }
1027 :
1028 0 : void V2Transport::SetReceiveState(RecvState recv_state) noexcept
1029 : {
1030 0 : AssertLockHeld(m_recv_mutex);
1031 : // Enforce allowed state transitions.
1032 0 : switch (m_recv_state) {
1033 : case RecvState::KEY_MAYBE_V1:
1034 0 : Assume(recv_state == RecvState::KEY || recv_state == RecvState::V1);
1035 0 : break;
1036 : case RecvState::KEY:
1037 0 : Assume(recv_state == RecvState::GARB_GARBTERM);
1038 0 : break;
1039 : case RecvState::GARB_GARBTERM:
1040 0 : Assume(recv_state == RecvState::GARBAUTH);
1041 0 : break;
1042 : case RecvState::GARBAUTH:
1043 0 : Assume(recv_state == RecvState::VERSION);
1044 0 : break;
1045 : case RecvState::VERSION:
1046 0 : Assume(recv_state == RecvState::APP);
1047 0 : break;
1048 : case RecvState::APP:
1049 0 : Assume(recv_state == RecvState::APP_READY);
1050 0 : break;
1051 : case RecvState::APP_READY:
1052 0 : Assume(recv_state == RecvState::APP);
1053 0 : break;
1054 : case RecvState::V1:
1055 0 : Assume(false); // V1 state cannot be left
1056 0 : break;
1057 : }
1058 : // Change state.
1059 0 : m_recv_state = recv_state;
1060 0 : }
1061 :
1062 0 : void V2Transport::SetSendState(SendState send_state) noexcept
1063 : {
1064 0 : AssertLockHeld(m_send_mutex);
1065 : // Enforce allowed state transitions.
1066 0 : switch (m_send_state) {
1067 : case SendState::MAYBE_V1:
1068 0 : Assume(send_state == SendState::V1 || send_state == SendState::AWAITING_KEY);
1069 0 : break;
1070 : case SendState::AWAITING_KEY:
1071 0 : Assume(send_state == SendState::READY);
1072 0 : break;
1073 : case SendState::READY:
1074 : case SendState::V1:
1075 0 : Assume(false); // Final states
1076 0 : break;
1077 : }
1078 : // Change state.
1079 0 : m_send_state = send_state;
1080 0 : }
1081 :
1082 0 : bool V2Transport::ReceivedMessageComplete() const noexcept
1083 : {
1084 0 : AssertLockNotHeld(m_recv_mutex);
1085 0 : LOCK(m_recv_mutex);
1086 0 : if (m_recv_state == RecvState::V1) return m_v1_fallback.ReceivedMessageComplete();
1087 :
1088 0 : return m_recv_state == RecvState::APP_READY;
1089 0 : }
1090 :
1091 0 : void V2Transport::ProcessReceivedMaybeV1Bytes() noexcept
1092 : {
1093 0 : AssertLockHeld(m_recv_mutex);
1094 0 : AssertLockNotHeld(m_send_mutex);
1095 0 : Assume(m_recv_state == RecvState::KEY_MAYBE_V1);
1096 : // We still have to determine if this is a v1 or v2 connection. The bytes being received could
1097 : // be the beginning of either a v1 packet (network magic + "version\x00"), or of a v2 public
1098 : // key. BIP324 specifies that a mismatch with this 12-byte string should trigger sending of the
1099 : // key.
1100 0 : std::array<uint8_t, V1_PREFIX_LEN> v1_prefix = {0, 0, 0, 0, 'v', 'e', 'r', 's', 'i', 'o', 'n', 0};
1101 0 : std::copy(std::begin(Params().MessageStart()), std::end(Params().MessageStart()), v1_prefix.begin());
1102 0 : Assume(m_recv_buffer.size() <= v1_prefix.size());
1103 0 : if (!std::equal(m_recv_buffer.begin(), m_recv_buffer.end(), v1_prefix.begin())) {
1104 : // Mismatch with v1 prefix, so we can assume a v2 connection.
1105 0 : SetReceiveState(RecvState::KEY); // Convert to KEY state, leaving received bytes around.
1106 : // Transition the sender to AWAITING_KEY state and start sending.
1107 0 : LOCK(m_send_mutex);
1108 0 : SetSendState(SendState::AWAITING_KEY);
1109 0 : StartSendingHandshake();
1110 0 : } else if (m_recv_buffer.size() == v1_prefix.size()) {
1111 : // Full match with the v1 prefix, so fall back to v1 behavior.
1112 0 : LOCK(m_send_mutex);
1113 0 : Span<const uint8_t> feedback{m_recv_buffer};
1114 : // Feed already received bytes to v1 transport. It should always accept these, because it's
1115 : // less than the size of a v1 header, and these are the first bytes fed to m_v1_fallback.
1116 0 : bool ret = m_v1_fallback.ReceivedBytes(feedback);
1117 0 : Assume(feedback.empty());
1118 0 : Assume(ret);
1119 0 : SetReceiveState(RecvState::V1);
1120 0 : SetSendState(SendState::V1);
1121 : // Reset v2 transport buffers to save memory.
1122 0 : ClearShrink(m_recv_buffer);
1123 0 : ClearShrink(m_send_buffer);
1124 0 : } else {
1125 : // We have not received enough to distinguish v1 from v2 yet. Wait until more bytes come.
1126 : }
1127 0 : }
1128 :
1129 0 : bool V2Transport::ProcessReceivedKeyBytes() noexcept
1130 : {
1131 0 : AssertLockHeld(m_recv_mutex);
1132 0 : AssertLockNotHeld(m_send_mutex);
1133 0 : Assume(m_recv_state == RecvState::KEY);
1134 0 : Assume(m_recv_buffer.size() <= EllSwiftPubKey::size());
1135 :
1136 : // As a special exception, if bytes 4-16 of the key on a responder connection match the
1137 : // corresponding bytes of a V1 version message, but bytes 0-4 don't match the network magic
1138 : // (if they did, we'd have switched to V1 state already), assume this is a peer from
1139 : // another network, and disconnect them. They will almost certainly disconnect us too when
1140 : // they receive our uniformly random key and garbage, but detecting this case specially
1141 : // means we can log it.
1142 : static constexpr std::array<uint8_t, 12> MATCH = {'v', 'e', 'r', 's', 'i', 'o', 'n', 0, 0, 0, 0, 0};
1143 : static constexpr size_t OFFSET = std::tuple_size_v<MessageStartChars>;
1144 0 : if (!m_initiating && m_recv_buffer.size() >= OFFSET + MATCH.size()) {
1145 0 : if (std::equal(MATCH.begin(), MATCH.end(), m_recv_buffer.begin() + OFFSET)) {
1146 0 : LogPrint(BCLog::NET, "V2 transport error: V1 peer with wrong MessageStart %s\n",
1147 : HexStr(Span(m_recv_buffer).first(OFFSET)));
1148 0 : return false;
1149 : }
1150 0 : }
1151 :
1152 0 : if (m_recv_buffer.size() == EllSwiftPubKey::size()) {
1153 : // Other side's key has been fully received, and can now be Diffie-Hellman combined with
1154 : // our key to initialize the encryption ciphers.
1155 :
1156 : // Initialize the ciphers.
1157 0 : EllSwiftPubKey ellswift(MakeByteSpan(m_recv_buffer));
1158 0 : LOCK(m_send_mutex);
1159 0 : m_cipher.Initialize(ellswift, m_initiating);
1160 :
1161 : // Switch receiver state to GARB_GARBTERM.
1162 0 : SetReceiveState(RecvState::GARB_GARBTERM);
1163 0 : m_recv_buffer.clear();
1164 :
1165 : // Switch sender state to READY.
1166 0 : SetSendState(SendState::READY);
1167 :
1168 : // Append the garbage terminator to the send buffer.
1169 0 : m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1170 0 : std::copy(m_cipher.GetSendGarbageTerminator().begin(),
1171 0 : m_cipher.GetSendGarbageTerminator().end(),
1172 0 : MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN).begin());
1173 :
1174 : // Construct garbage authentication packet in the send buffer (using the garbage data which
1175 : // is still there).
1176 0 : m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::EXPANSION);
1177 0 : m_cipher.Encrypt(
1178 0 : /*contents=*/{},
1179 0 : /*aad=*/MakeByteSpan(m_send_garbage),
1180 : /*ignore=*/false,
1181 0 : /*output=*/MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::EXPANSION));
1182 : // We no longer need the garbage.
1183 0 : ClearShrink(m_send_garbage);
1184 :
1185 : // Construct version packet in the send buffer.
1186 0 : m_send_buffer.resize(m_send_buffer.size() + BIP324Cipher::EXPANSION + VERSION_CONTENTS.size());
1187 0 : m_cipher.Encrypt(
1188 0 : /*contents=*/VERSION_CONTENTS,
1189 0 : /*aad=*/{},
1190 : /*ignore=*/false,
1191 0 : /*output=*/MakeWritableByteSpan(m_send_buffer).last(BIP324Cipher::EXPANSION + VERSION_CONTENTS.size()));
1192 0 : } else {
1193 : // We still have to receive more key bytes.
1194 : }
1195 0 : return true;
1196 0 : }
1197 :
1198 0 : bool V2Transport::ProcessReceivedGarbageBytes() noexcept
1199 : {
1200 0 : AssertLockHeld(m_recv_mutex);
1201 0 : Assume(m_recv_state == RecvState::GARB_GARBTERM);
1202 0 : Assume(m_recv_buffer.size() <= MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1203 0 : if (m_recv_buffer.size() >= BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
1204 0 : if (MakeByteSpan(m_recv_buffer).last(BIP324Cipher::GARBAGE_TERMINATOR_LEN) == m_cipher.GetReceiveGarbageTerminator()) {
1205 : // Garbage terminator received. Switch to receiving garbage authentication packet.
1206 0 : m_recv_garbage = std::move(m_recv_buffer);
1207 0 : m_recv_garbage.resize(m_recv_garbage.size() - BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1208 0 : m_recv_buffer.clear();
1209 0 : SetReceiveState(RecvState::GARBAUTH);
1210 0 : } else if (m_recv_buffer.size() == MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN) {
1211 : // We've reached the maximum length for garbage + garbage terminator, and the
1212 : // terminator still does not match. Abort.
1213 0 : LogPrint(BCLog::NET, "V2 transport error: missing garbage terminator, peer=%d\n", m_nodeid);
1214 0 : return false;
1215 : } else {
1216 : // We still need to receive more garbage and/or garbage terminator bytes.
1217 : }
1218 0 : } else {
1219 : // We have less than GARBAGE_TERMINATOR_LEN (16) bytes, so we certainly need to receive
1220 : // more first.
1221 : }
1222 0 : return true;
1223 0 : }
1224 :
1225 0 : bool V2Transport::ProcessReceivedPacketBytes() noexcept
1226 : {
1227 0 : AssertLockHeld(m_recv_mutex);
1228 0 : Assume(m_recv_state == RecvState::GARBAUTH || m_recv_state == RecvState::VERSION ||
1229 : m_recv_state == RecvState::APP);
1230 :
1231 : // The maximum permitted contents length for a packet, consisting of:
1232 : // - 0x00 byte: indicating long message type encoding
1233 : // - 12 bytes of message type
1234 : // - payload
1235 : static constexpr size_t MAX_CONTENTS_LEN =
1236 : 1 + CMessageHeader::COMMAND_SIZE +
1237 : std::min<size_t>(MAX_SIZE, MAX_PROTOCOL_MESSAGE_LENGTH);
1238 :
1239 0 : if (m_recv_buffer.size() == BIP324Cipher::LENGTH_LEN) {
1240 : // Length descriptor received.
1241 0 : m_recv_len = m_cipher.DecryptLength(MakeByteSpan(m_recv_buffer));
1242 0 : if (m_recv_len > MAX_CONTENTS_LEN) {
1243 0 : LogPrint(BCLog::NET, "V2 transport error: packet too large (%u bytes), peer=%d\n", m_recv_len, m_nodeid);
1244 0 : return false;
1245 : }
1246 0 : } else if (m_recv_buffer.size() > BIP324Cipher::LENGTH_LEN && m_recv_buffer.size() == m_recv_len + BIP324Cipher::EXPANSION) {
1247 : // Ciphertext received, decrypt it into m_recv_decode_buffer.
1248 : // Note that it is impossible to reach this branch without hitting the branch above first,
1249 : // as GetMaxBytesToProcess only allows up to LENGTH_LEN into the buffer before that point.
1250 0 : m_recv_decode_buffer.resize(m_recv_len);
1251 0 : bool ignore{false};
1252 0 : Span<const std::byte> aad;
1253 0 : if (m_recv_state == RecvState::GARBAUTH) aad = MakeByteSpan(m_recv_garbage);
1254 0 : bool ret = m_cipher.Decrypt(
1255 0 : /*input=*/MakeByteSpan(m_recv_buffer).subspan(BIP324Cipher::LENGTH_LEN),
1256 0 : /*aad=*/aad,
1257 : /*ignore=*/ignore,
1258 0 : /*contents=*/MakeWritableByteSpan(m_recv_decode_buffer));
1259 0 : if (!ret) {
1260 0 : LogPrint(BCLog::NET, "V2 transport error: packet decryption failure (%u bytes), peer=%d\n", m_recv_len, m_nodeid);
1261 0 : return false;
1262 : }
1263 : // Feed the last 4 bytes of the Poly1305 authentication tag (and its timing) into our RNG.
1264 0 : RandAddEvent(ReadLE32(m_recv_buffer.data() + m_recv_buffer.size() - 4));
1265 :
1266 : // At this point we have a valid packet decrypted into m_recv_decode_buffer. Depending on
1267 : // the current state, decide what to do with it.
1268 0 : switch (m_recv_state) {
1269 : case RecvState::GARBAUTH:
1270 : // Ignore flag does not matter for garbage authentication. Any valid packet functions
1271 : // as authentication. Receive and process the version packet next.
1272 0 : SetReceiveState(RecvState::VERSION);
1273 0 : ClearShrink(m_recv_garbage);
1274 0 : break;
1275 : case RecvState::VERSION:
1276 0 : if (!ignore) {
1277 : // Version message received; transition to application phase. The contents is
1278 : // ignored, but can be used for future extensions.
1279 0 : SetReceiveState(RecvState::APP);
1280 0 : }
1281 0 : break;
1282 : case RecvState::APP:
1283 0 : if (!ignore) {
1284 : // Application message decrypted correctly. It can be extracted using GetMessage().
1285 0 : SetReceiveState(RecvState::APP_READY);
1286 0 : }
1287 0 : break;
1288 : default:
1289 : // Any other state is invalid (this function should not have been called).
1290 0 : Assume(false);
1291 0 : }
1292 : // Wipe the receive buffer where the next packet will be received into.
1293 0 : ClearShrink(m_recv_buffer);
1294 : // In all but APP_READY state, we can wipe the decoded contents.
1295 0 : if (m_recv_state != RecvState::APP_READY) ClearShrink(m_recv_decode_buffer);
1296 0 : } else {
1297 : // We either have less than 3 bytes, so we don't know the packet's length yet, or more
1298 : // than 3 bytes but less than the packet's full ciphertext. Wait until those arrive.
1299 : }
1300 0 : return true;
1301 0 : }
1302 :
1303 0 : size_t V2Transport::GetMaxBytesToProcess() noexcept
1304 : {
1305 0 : AssertLockHeld(m_recv_mutex);
1306 0 : switch (m_recv_state) {
1307 : case RecvState::KEY_MAYBE_V1:
1308 : // During the KEY_MAYBE_V1 state we do not allow more than the length of v1 prefix into the
1309 : // receive buffer.
1310 0 : Assume(m_recv_buffer.size() <= V1_PREFIX_LEN);
1311 : // As long as we're not sure if this is a v1 or v2 connection, don't receive more than what
1312 : // is strictly necessary to distinguish the two (12 bytes). If we permitted more than
1313 : // the v1 header size (24 bytes), we may not be able to feed the already-received bytes
1314 : // back into the m_v1_fallback V1 transport.
1315 0 : return V1_PREFIX_LEN - m_recv_buffer.size();
1316 : case RecvState::KEY:
1317 : // During the KEY state, we only allow the 64-byte key into the receive buffer.
1318 0 : Assume(m_recv_buffer.size() <= EllSwiftPubKey::size());
1319 : // As long as we have not received the other side's public key, don't receive more than
1320 : // that (64 bytes), as garbage follows, and locating the garbage terminator requires the
1321 : // key exchange first.
1322 0 : return EllSwiftPubKey::size() - m_recv_buffer.size();
1323 : case RecvState::GARB_GARBTERM:
1324 : // Process garbage bytes one by one (because terminator may appear anywhere).
1325 0 : return 1;
1326 : case RecvState::GARBAUTH:
1327 : case RecvState::VERSION:
1328 : case RecvState::APP:
1329 : // These three states all involve decoding a packet. Process the length descriptor first,
1330 : // so that we know where the current packet ends (and we don't process bytes from the next
1331 : // packet or decoy yet). Then, process the ciphertext bytes of the current packet.
1332 0 : if (m_recv_buffer.size() < BIP324Cipher::LENGTH_LEN) {
1333 0 : return BIP324Cipher::LENGTH_LEN - m_recv_buffer.size();
1334 : } else {
1335 : // Note that BIP324Cipher::EXPANSION is the total difference between contents size
1336 : // and encoded packet size, which includes the 3 bytes due to the packet length.
1337 : // When transitioning from receiving the packet length to receiving its ciphertext,
1338 : // the encrypted packet length is left in the receive buffer.
1339 0 : return BIP324Cipher::EXPANSION + m_recv_len - m_recv_buffer.size();
1340 : }
1341 : case RecvState::APP_READY:
1342 : // No bytes can be processed until GetMessage() is called.
1343 0 : return 0;
1344 : case RecvState::V1:
1345 : // Not allowed (must be dealt with by the caller).
1346 0 : Assume(false);
1347 0 : return 0;
1348 : }
1349 0 : Assume(false); // unreachable
1350 0 : return 0;
1351 0 : }
1352 :
1353 0 : bool V2Transport::ReceivedBytes(Span<const uint8_t>& msg_bytes) noexcept
1354 : {
1355 0 : AssertLockNotHeld(m_recv_mutex);
1356 : /** How many bytes to allocate in the receive buffer at most above what is received so far. */
1357 : static constexpr size_t MAX_RESERVE_AHEAD = 256 * 1024;
1358 :
1359 0 : LOCK(m_recv_mutex);
1360 0 : if (m_recv_state == RecvState::V1) return m_v1_fallback.ReceivedBytes(msg_bytes);
1361 :
1362 : // Process the provided bytes in msg_bytes in a loop. In each iteration a nonzero number of
1363 : // bytes (decided by GetMaxBytesToProcess) are taken from the beginning om msg_bytes, and
1364 : // appended to m_recv_buffer. Then, depending on the receiver state, one of the
1365 : // ProcessReceived*Bytes functions is called to process the bytes in that buffer.
1366 0 : while (!msg_bytes.empty()) {
1367 1 : // Decide how many bytes to copy from msg_bytes to m_recv_buffer.
1368 1 : size_t max_read = GetMaxBytesToProcess();
1369 :
1370 : // Reserve space in the buffer if there is not enough.
1371 1 : if (m_recv_buffer.size() + std::min(msg_bytes.size(), max_read) > m_recv_buffer.capacity()) {
1372 1 : switch (m_recv_state) {
1373 : case RecvState::KEY_MAYBE_V1:
1374 : case RecvState::KEY:
1375 : case RecvState::GARB_GARBTERM:
1376 : // During the initial states (key/garbage), allocate once to fit the maximum (4111
1377 : // bytes).
1378 0 : m_recv_buffer.reserve(MAX_GARBAGE_LEN + BIP324Cipher::GARBAGE_TERMINATOR_LEN);
1379 0 : break;
1380 : case RecvState::GARBAUTH:
1381 : case RecvState::VERSION:
1382 1 : case RecvState::APP: {
1383 1 : // During states where a packet is being received, as much as is expected but never
1384 : // more than MAX_RESERVE_AHEAD bytes in addition to what is received so far.
1385 : // This means attackers that want to cause us to waste allocated memory are limited
1386 1 : // to MAX_RESERVE_AHEAD above the largest allowed message contents size, and to
1387 1 : // MAX_RESERVE_AHEAD more than they've actually sent us.
1388 0 : size_t alloc_add = std::min(max_read, msg_bytes.size() + MAX_RESERVE_AHEAD);
1389 0 : m_recv_buffer.reserve(m_recv_buffer.size() + alloc_add);
1390 0 : break;
1391 : }
1392 : case RecvState::APP_READY:
1393 : // The buffer is empty in this state.
1394 0 : Assume(m_recv_buffer.empty());
1395 0 : break;
1396 : case RecvState::V1:
1397 1 : // Should have bailed out above.
1398 1 : Assume(false);
1399 0 : break;
1400 : }
1401 1 : }
1402 :
1403 : // Can't read more than provided input.
1404 0 : max_read = std::min(msg_bytes.size(), max_read);
1405 : // Copy data to buffer.
1406 0 : m_recv_buffer.insert(m_recv_buffer.end(), UCharCast(msg_bytes.data()), UCharCast(msg_bytes.data() + max_read));
1407 0 : msg_bytes = msg_bytes.subspan(max_read);
1408 :
1409 : // Process data in the buffer.
1410 0 : switch (m_recv_state) {
1411 0 : case RecvState::KEY_MAYBE_V1:
1412 0 : ProcessReceivedMaybeV1Bytes();
1413 0 : if (m_recv_state == RecvState::V1) return true;
1414 0 : break;
1415 :
1416 : case RecvState::KEY:
1417 0 : if (!ProcessReceivedKeyBytes()) return false;
1418 0 : break;
1419 :
1420 : case RecvState::GARB_GARBTERM:
1421 0 : if (!ProcessReceivedGarbageBytes()) return false;
1422 0 : break;
1423 :
1424 : case RecvState::GARBAUTH:
1425 : case RecvState::VERSION:
1426 : case RecvState::APP:
1427 0 : if (!ProcessReceivedPacketBytes()) return false;
1428 0 : break;
1429 :
1430 : case RecvState::APP_READY:
1431 0 : return true;
1432 :
1433 : case RecvState::V1:
1434 : // We should have bailed out before.
1435 0 : Assume(false);
1436 0 : break;
1437 : }
1438 : // Make sure we have made progress before continuing.
1439 0 : Assume(max_read > 0);
1440 : }
1441 :
1442 0 : return true;
1443 0 : }
1444 :
1445 0 : std::optional<std::string> V2Transport::GetMessageType(Span<const uint8_t>& contents) noexcept
1446 : {
1447 0 : if (contents.size() == 0) return std::nullopt; // Empty contents
1448 0 : uint8_t first_byte = contents[0];
1449 0 : contents = contents.subspan(1); // Strip first byte.
1450 :
1451 0 : if (first_byte != 0) {
1452 : // Short (1 byte) encoding.
1453 0 : if (first_byte < std::size(V2_MESSAGE_IDS)) {
1454 : // Valid short message id.
1455 0 : return V2_MESSAGE_IDS[first_byte];
1456 : } else {
1457 : // Unknown short message id.
1458 0 : return std::nullopt;
1459 : }
1460 : }
1461 :
1462 0 : if (contents.size() < CMessageHeader::COMMAND_SIZE) {
1463 0 : return std::nullopt; // Long encoding needs 12 message type bytes.
1464 : }
1465 :
1466 0 : size_t msg_type_len{0};
1467 0 : while (msg_type_len < CMessageHeader::COMMAND_SIZE && contents[msg_type_len] != 0) {
1468 : // Verify that message type bytes before the first 0x00 are in range.
1469 0 : if (contents[msg_type_len] < ' ' || contents[msg_type_len] > 0x7F) {
1470 0 : return {};
1471 : }
1472 0 : ++msg_type_len;
1473 : }
1474 0 : std::string ret{reinterpret_cast<const char*>(contents.data()), msg_type_len};
1475 0 : while (msg_type_len < CMessageHeader::COMMAND_SIZE) {
1476 1 : // Verify that message type bytes after the first 0x00 are also 0x00.
1477 0 : if (contents[msg_type_len] != 0) return {};
1478 0 : ++msg_type_len;
1479 : }
1480 : // Strip message type bytes of contents.
1481 0 : contents = contents.subspan(CMessageHeader::COMMAND_SIZE);
1482 0 : return {std::move(ret)};
1483 0 : }
1484 :
1485 0 : CNetMessage V2Transport::GetReceivedMessage(std::chrono::microseconds time, bool& reject_message) noexcept
1486 : {
1487 0 : AssertLockNotHeld(m_recv_mutex);
1488 0 : LOCK(m_recv_mutex);
1489 0 : if (m_recv_state == RecvState::V1) return m_v1_fallback.GetReceivedMessage(time, reject_message);
1490 :
1491 0 : Assume(m_recv_state == RecvState::APP_READY);
1492 0 : Span<const uint8_t> contents{m_recv_decode_buffer};
1493 0 : auto msg_type = GetMessageType(contents);
1494 0 : CDataStream ret(m_recv_type, m_recv_version);
1495 0 : CNetMessage msg{std::move(ret)};
1496 : // Note that BIP324Cipher::EXPANSION also includes the length descriptor size.
1497 0 : msg.m_raw_message_size = m_recv_decode_buffer.size() + BIP324Cipher::EXPANSION;
1498 0 : if (msg_type) {
1499 0 : reject_message = false;
1500 0 : msg.m_type = std::move(*msg_type);
1501 0 : msg.m_time = time;
1502 0 : msg.m_message_size = contents.size();
1503 0 : msg.m_recv.resize(contents.size());
1504 0 : std::copy(contents.begin(), contents.end(), UCharCast(msg.m_recv.data()));
1505 0 : } else {
1506 0 : LogPrint(BCLog::NET, "V2 transport error: invalid message type (%u bytes contents), peer=%d\n", m_recv_decode_buffer.size(), m_nodeid);
1507 0 : reject_message = true;
1508 : }
1509 1 : ClearShrink(m_recv_decode_buffer);
1510 0 : SetReceiveState(RecvState::APP);
1511 :
1512 0 : return msg;
1513 0 : }
1514 :
1515 0 : bool V2Transport::SetMessageToSend(CSerializedNetMsg& msg) noexcept
1516 : {
1517 0 : AssertLockNotHeld(m_send_mutex);
1518 0 : LOCK(m_send_mutex);
1519 0 : if (m_send_state == SendState::V1) return m_v1_fallback.SetMessageToSend(msg);
1520 : // We only allow adding a new message to be sent when in the READY state (so the packet cipher
1521 : // is available) and the send buffer is empty. This limits the number of messages in the send
1522 : // buffer to just one, and leaves the responsibility for queueing them up to the caller.
1523 0 : if (!(m_send_state == SendState::READY && m_send_buffer.empty())) return false;
1524 : // Construct contents (encoding message type + payload).
1525 0 : std::vector<uint8_t> contents;
1526 0 : auto short_message_id = V2_MESSAGE_MAP(msg.m_type);
1527 0 : if (short_message_id) {
1528 0 : contents.resize(1 + msg.data.size());
1529 0 : contents[0] = *short_message_id;
1530 0 : std::copy(msg.data.begin(), msg.data.end(), contents.begin() + 1);
1531 0 : } else {
1532 : // Initialize with zeroes, and then write the message type string starting at offset 1.
1533 : // This means contents[0] and the unused positions in contents[1..13] remain 0x00.
1534 0 : contents.resize(1 + CMessageHeader::COMMAND_SIZE + msg.data.size(), 0);
1535 0 : std::copy(msg.m_type.begin(), msg.m_type.end(), contents.data() + 1);
1536 0 : std::copy(msg.data.begin(), msg.data.end(), contents.begin() + 1 + CMessageHeader::COMMAND_SIZE);
1537 : }
1538 : // Construct ciphertext in send buffer.
1539 0 : m_send_buffer.resize(contents.size() + BIP324Cipher::EXPANSION);
1540 0 : m_cipher.Encrypt(MakeByteSpan(contents), {}, false, MakeWritableByteSpan(m_send_buffer));
1541 0 : m_send_type = msg.m_type;
1542 : // Release memory
1543 0 : ClearShrink(msg.data);
1544 0 : return true;
1545 0 : }
1546 :
1547 0 : Transport::BytesToSend V2Transport::GetBytesToSend(bool have_next_message) const noexcept
1548 : {
1549 0 : AssertLockNotHeld(m_send_mutex);
1550 0 : LOCK(m_send_mutex);
1551 0 : if (m_send_state == SendState::V1) return m_v1_fallback.GetBytesToSend(have_next_message);
1552 :
1553 0 : if (m_send_state == SendState::MAYBE_V1) Assume(m_send_buffer.empty());
1554 0 : Assume(m_send_pos <= m_send_buffer.size());
1555 0 : return {
1556 0 : Span{m_send_buffer}.subspan(m_send_pos),
1557 : // We only have more to send after the current m_send_buffer if there is a (next)
1558 : // message to be sent, and we're capable of sending packets. */
1559 0 : have_next_message && m_send_state == SendState::READY,
1560 0 : m_send_type
1561 : };
1562 0 : }
1563 :
1564 0 : void V2Transport::MarkBytesSent(size_t bytes_sent) noexcept
1565 : {
1566 0 : AssertLockNotHeld(m_send_mutex);
1567 0 : LOCK(m_send_mutex);
1568 0 : if (m_send_state == SendState::V1) return m_v1_fallback.MarkBytesSent(bytes_sent);
1569 :
1570 0 : m_send_pos += bytes_sent;
1571 0 : Assume(m_send_pos <= m_send_buffer.size());
1572 : // Wipe the buffer when everything is sent.
1573 0 : if (m_send_pos == m_send_buffer.size()) {
1574 0 : m_send_pos = 0;
1575 0 : ClearShrink(m_send_buffer);
1576 0 : }
1577 0 : }
1578 :
1579 0 : size_t V2Transport::GetSendMemoryUsage() const noexcept
1580 : {
1581 0 : AssertLockNotHeld(m_send_mutex);
1582 0 : LOCK(m_send_mutex);
1583 0 : if (m_send_state == SendState::V1) return m_v1_fallback.GetSendMemoryUsage();
1584 :
1585 0 : return sizeof(m_send_buffer) + memusage::DynamicUsage(m_send_buffer);
1586 0 : }
1587 :
1588 0 : std::pair<size_t, bool> CConnman::SocketSendData(CNode& node) const
1589 : {
1590 0 : auto it = node.vSendMsg.begin();
1591 0 : size_t nSentSize = 0;
1592 0 : bool data_left{false}; //!< second return value (whether unsent data remains)
1593 0 : std::optional<bool> expected_more;
1594 :
1595 0 : while (true) {
1596 0 : if (it != node.vSendMsg.end()) {
1597 : // If possible, move one message from the send queue to the transport. This fails when
1598 : // there is an existing message still being sent, or (for v2 transports) when the
1599 : // handshake has not yet completed.
1600 0 : size_t memusage = it->GetMemoryUsage();
1601 0 : if (node.m_transport->SetMessageToSend(*it)) {
1602 : // Update memory usage of send buffer (as *it will be deleted).
1603 0 : node.m_send_memusage -= memusage;
1604 0 : ++it;
1605 0 : }
1606 0 : }
1607 0 : const auto& [data, more, msg_type] = node.m_transport->GetBytesToSend(it != node.vSendMsg.end());
1608 : // We rely on the 'more' value returned by GetBytesToSend to correctly predict whether more
1609 : // bytes are still to be sent, to correctly set the MSG_MORE flag. As a sanity check,
1610 : // verify that the previously returned 'more' was correct.
1611 0 : if (expected_more.has_value()) Assume(!data.empty() == *expected_more);
1612 0 : expected_more = more;
1613 0 : data_left = !data.empty(); // will be overwritten on next loop if all of data gets sent
1614 0 : int nBytes = 0;
1615 0 : if (!data.empty()) {
1616 0 : LOCK(node.m_sock_mutex);
1617 : // There is no socket in case we've already disconnected, or in test cases without
1618 : // real connections. In these cases, we bail out immediately and just leave things
1619 : // in the send queue and transport.
1620 0 : if (!node.m_sock) {
1621 0 : break;
1622 : }
1623 0 : int flags = MSG_NOSIGNAL | MSG_DONTWAIT;
1624 : #ifdef MSG_MORE
1625 0 : if (more) {
1626 0 : flags |= MSG_MORE;
1627 0 : }
1628 : #endif
1629 0 : nBytes = node.m_sock->Send(reinterpret_cast<const char*>(data.data()), data.size(), flags);
1630 0 : }
1631 0 : if (nBytes > 0) {
1632 0 : node.m_last_send = GetTime<std::chrono::seconds>();
1633 0 : node.nSendBytes += nBytes;
1634 : // Notify transport that bytes have been processed.
1635 0 : node.m_transport->MarkBytesSent(nBytes);
1636 : // Update statistics per message type.
1637 0 : node.AccountForSentBytes(msg_type, nBytes);
1638 0 : nSentSize += nBytes;
1639 0 : if ((size_t)nBytes != data.size()) {
1640 : // could not send full message; stop sending more
1641 0 : break;
1642 : }
1643 0 : } else {
1644 0 : if (nBytes < 0) {
1645 : // error
1646 0 : int nErr = WSAGetLastError();
1647 0 : if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS) {
1648 0 : LogPrint(BCLog::NET, "socket send error for peer=%d: %s\n", node.GetId(), NetworkErrorString(nErr));
1649 0 : node.CloseSocketDisconnect();
1650 0 : }
1651 0 : }
1652 0 : break;
1653 : }
1654 : }
1655 :
1656 0 : node.fPauseSend = node.m_send_memusage + node.m_transport->GetSendMemoryUsage() > nSendBufferMaxSize;
1657 :
1658 0 : if (it == node.vSendMsg.end()) {
1659 0 : assert(node.m_send_memusage == 0);
1660 0 : }
1661 0 : node.vSendMsg.erase(node.vSendMsg.begin(), it);
1662 0 : return {nSentSize, data_left};
1663 0 : }
1664 :
1665 : /** Try to find a connection to evict when the node is full.
1666 : * Extreme care must be taken to avoid opening the node to attacker
1667 : * triggered network partitioning.
1668 : * The strategy used here is to protect a small number of peers
1669 : * for each of several distinct characteristics which are difficult
1670 : * to forge. In order to partition a node the attacker must be
1671 : * simultaneously better at all of them than honest peers.
1672 : */
1673 0 : bool CConnman::AttemptToEvictConnection()
1674 : {
1675 0 : std::vector<NodeEvictionCandidate> vEvictionCandidates;
1676 : {
1677 :
1678 0 : LOCK(m_nodes_mutex);
1679 0 : for (const CNode* node : m_nodes) {
1680 0 : if (node->fDisconnect)
1681 0 : continue;
1682 0 : NodeEvictionCandidate candidate{
1683 0 : .id = node->GetId(),
1684 0 : .m_connected = node->m_connected,
1685 0 : .m_min_ping_time = node->m_min_ping_time,
1686 0 : .m_last_block_time = node->m_last_block_time,
1687 0 : .m_last_tx_time = node->m_last_tx_time,
1688 0 : .fRelevantServices = node->m_has_all_wanted_services,
1689 0 : .m_relay_txs = node->m_relays_txs.load(),
1690 0 : .fBloomFilter = node->m_bloom_filter_loaded.load(),
1691 0 : .nKeyedNetGroup = node->nKeyedNetGroup,
1692 0 : .prefer_evict = node->m_prefer_evict,
1693 0 : .m_is_local = node->addr.IsLocal(),
1694 0 : .m_network = node->ConnectedThroughNetwork(),
1695 0 : .m_noban = node->HasPermission(NetPermissionFlags::NoBan),
1696 0 : .m_conn_type = node->m_conn_type,
1697 : };
1698 0 : vEvictionCandidates.push_back(candidate);
1699 : }
1700 0 : }
1701 0 : const std::optional<NodeId> node_id_to_evict = SelectNodeToEvict(std::move(vEvictionCandidates));
1702 0 : if (!node_id_to_evict) {
1703 0 : return false;
1704 : }
1705 0 : LOCK(m_nodes_mutex);
1706 0 : for (CNode* pnode : m_nodes) {
1707 0 : if (pnode->GetId() == *node_id_to_evict) {
1708 0 : LogPrint(BCLog::NET, "selected %s connection for eviction peer=%d; disconnecting\n", pnode->ConnectionTypeAsString(), pnode->GetId());
1709 0 : pnode->fDisconnect = true;
1710 0 : return true;
1711 : }
1712 : }
1713 0 : return false;
1714 0 : }
1715 :
1716 0 : void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
1717 : struct sockaddr_storage sockaddr;
1718 0 : socklen_t len = sizeof(sockaddr);
1719 0 : auto sock = hListenSocket.sock->Accept((struct sockaddr*)&sockaddr, &len);
1720 0 : CAddress addr;
1721 :
1722 0 : if (!sock) {
1723 0 : const int nErr = WSAGetLastError();
1724 0 : if (nErr != WSAEWOULDBLOCK) {
1725 0 : LogPrintf("socket error accept failed: %s\n", NetworkErrorString(nErr));
1726 0 : }
1727 0 : return;
1728 : }
1729 :
1730 0 : if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr)) {
1731 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Warning, "Unknown socket family\n");
1732 0 : } else {
1733 0 : addr = CAddress{MaybeFlipIPv6toCJDNS(addr), NODE_NONE};
1734 : }
1735 :
1736 0 : const CAddress addr_bind{MaybeFlipIPv6toCJDNS(GetBindAddress(*sock)), NODE_NONE};
1737 :
1738 0 : NetPermissionFlags permission_flags = NetPermissionFlags::None;
1739 0 : hListenSocket.AddSocketPermissionFlags(permission_flags);
1740 :
1741 0 : CreateNodeFromAcceptedSocket(std::move(sock), permission_flags, addr_bind, addr);
1742 0 : }
1743 :
1744 0 : void CConnman::CreateNodeFromAcceptedSocket(std::unique_ptr<Sock>&& sock,
1745 : NetPermissionFlags permission_flags,
1746 : const CAddress& addr_bind,
1747 : const CAddress& addr)
1748 : {
1749 0 : int nInbound = 0;
1750 0 : int nMaxInbound = nMaxConnections - m_max_outbound;
1751 :
1752 0 : AddWhitelistPermissionFlags(permission_flags, addr);
1753 0 : if (NetPermissions::HasFlag(permission_flags, NetPermissionFlags::Implicit)) {
1754 0 : NetPermissions::ClearFlag(permission_flags, NetPermissionFlags::Implicit);
1755 0 : if (gArgs.GetBoolArg("-whitelistforcerelay", DEFAULT_WHITELISTFORCERELAY)) NetPermissions::AddFlag(permission_flags, NetPermissionFlags::ForceRelay);
1756 0 : if (gArgs.GetBoolArg("-whitelistrelay", DEFAULT_WHITELISTRELAY)) NetPermissions::AddFlag(permission_flags, NetPermissionFlags::Relay);
1757 0 : NetPermissions::AddFlag(permission_flags, NetPermissionFlags::Mempool);
1758 0 : NetPermissions::AddFlag(permission_flags, NetPermissionFlags::NoBan);
1759 0 : }
1760 :
1761 : {
1762 0 : LOCK(m_nodes_mutex);
1763 0 : for (const CNode* pnode : m_nodes) {
1764 0 : if (pnode->IsInboundConn()) nInbound++;
1765 : }
1766 0 : }
1767 :
1768 0 : if (!fNetworkActive) {
1769 0 : LogPrint(BCLog::NET, "connection from %s dropped: not accepting new connections\n", addr.ToStringAddrPort());
1770 0 : return;
1771 : }
1772 :
1773 0 : if (!sock->IsSelectable()) {
1774 0 : LogPrintf("connection from %s dropped: non-selectable socket\n", addr.ToStringAddrPort());
1775 0 : return;
1776 : }
1777 :
1778 : // According to the internet TCP_NODELAY is not carried into accepted sockets
1779 : // on all platforms. Set it again here just to be sure.
1780 0 : const int on{1};
1781 0 : if (sock->SetSockOpt(IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) == SOCKET_ERROR) {
1782 0 : LogPrint(BCLog::NET, "connection from %s: unable to set TCP_NODELAY, continuing anyway\n",
1783 : addr.ToStringAddrPort());
1784 0 : }
1785 :
1786 : // Don't accept connections from banned peers.
1787 0 : bool banned = m_banman && m_banman->IsBanned(addr);
1788 0 : if (!NetPermissions::HasFlag(permission_flags, NetPermissionFlags::NoBan) && banned)
1789 : {
1790 0 : LogPrint(BCLog::NET, "connection from %s dropped (banned)\n", addr.ToStringAddrPort());
1791 0 : return;
1792 : }
1793 :
1794 : // Only accept connections from discouraged peers if our inbound slots aren't (almost) full.
1795 0 : bool discouraged = m_banman && m_banman->IsDiscouraged(addr);
1796 0 : if (!NetPermissions::HasFlag(permission_flags, NetPermissionFlags::NoBan) && nInbound + 1 >= nMaxInbound && discouraged)
1797 : {
1798 0 : LogPrint(BCLog::NET, "connection from %s dropped (discouraged)\n", addr.ToStringAddrPort());
1799 0 : return;
1800 : }
1801 :
1802 0 : if (nInbound >= nMaxInbound)
1803 : {
1804 0 : if (!AttemptToEvictConnection()) {
1805 : // No connection to evict, disconnect the new connection
1806 0 : LogPrint(BCLog::NET, "failed to find an eviction candidate - connection dropped (full)\n");
1807 0 : return;
1808 : }
1809 0 : }
1810 :
1811 0 : NodeId id = GetNewNodeId();
1812 0 : uint64_t nonce = GetDeterministicRandomizer(RANDOMIZER_ID_LOCALHOSTNONCE).Write(id).Finalize();
1813 :
1814 0 : ServiceFlags nodeServices = nLocalServices;
1815 0 : if (NetPermissions::HasFlag(permission_flags, NetPermissionFlags::BloomFilter)) {
1816 0 : nodeServices = static_cast<ServiceFlags>(nodeServices | NODE_BLOOM);
1817 0 : }
1818 :
1819 0 : const bool inbound_onion = std::find(m_onion_binds.begin(), m_onion_binds.end(), addr_bind) != m_onion_binds.end();
1820 0 : CNode* pnode = new CNode(id,
1821 0 : std::move(sock),
1822 0 : addr,
1823 0 : CalculateKeyedNetGroup(addr),
1824 0 : nonce,
1825 0 : addr_bind,
1826 0 : /*addrNameIn=*/"",
1827 : ConnectionType::INBOUND,
1828 0 : inbound_onion,
1829 0 : CNodeOptions{
1830 0 : .permission_flags = permission_flags,
1831 0 : .prefer_evict = discouraged,
1832 0 : .recv_flood_size = nReceiveFloodSize,
1833 : });
1834 0 : pnode->AddRef();
1835 0 : m_msgproc->InitializeNode(*pnode, nodeServices);
1836 :
1837 0 : LogPrint(BCLog::NET, "connection from %s accepted\n", addr.ToStringAddrPort());
1838 :
1839 : {
1840 0 : LOCK(m_nodes_mutex);
1841 0 : m_nodes.push_back(pnode);
1842 0 : }
1843 :
1844 : // We received a new connection, harvest entropy from the time (and our peer count)
1845 0 : RandAddEvent((uint32_t)id);
1846 0 : }
1847 :
1848 0 : bool CConnman::AddConnection(const std::string& address, ConnectionType conn_type)
1849 : {
1850 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
1851 0 : std::optional<int> max_connections;
1852 0 : switch (conn_type) {
1853 : case ConnectionType::INBOUND:
1854 : case ConnectionType::MANUAL:
1855 0 : return false;
1856 : case ConnectionType::OUTBOUND_FULL_RELAY:
1857 0 : max_connections = m_max_outbound_full_relay;
1858 0 : break;
1859 : case ConnectionType::BLOCK_RELAY:
1860 0 : max_connections = m_max_outbound_block_relay;
1861 0 : break;
1862 : // no limit for ADDR_FETCH because -seednode has no limit either
1863 : case ConnectionType::ADDR_FETCH:
1864 0 : break;
1865 : // no limit for FEELER connections since they're short-lived
1866 : case ConnectionType::FEELER:
1867 0 : break;
1868 : } // no default case, so the compiler can warn about missing cases
1869 :
1870 : // Count existing connections
1871 0 : int existing_connections = WITH_LOCK(m_nodes_mutex,
1872 : return std::count_if(m_nodes.begin(), m_nodes.end(), [conn_type](CNode* node) { return node->m_conn_type == conn_type; }););
1873 :
1874 : // Max connections of specified type already exist
1875 0 : if (max_connections != std::nullopt && existing_connections >= max_connections) return false;
1876 :
1877 : // Max total outbound connections already exist
1878 0 : CSemaphoreGrant grant(*semOutbound, true);
1879 0 : if (!grant) return false;
1880 :
1881 0 : OpenNetworkConnection(CAddress(), false, &grant, address.c_str(), conn_type);
1882 0 : return true;
1883 0 : }
1884 :
1885 0 : void CConnman::DisconnectNodes()
1886 : {
1887 : {
1888 0 : LOCK(m_nodes_mutex);
1889 :
1890 0 : if (!fNetworkActive) {
1891 : // Disconnect any connected nodes
1892 0 : for (CNode* pnode : m_nodes) {
1893 0 : if (!pnode->fDisconnect) {
1894 0 : LogPrint(BCLog::NET, "Network not active, dropping peer=%d\n", pnode->GetId());
1895 0 : pnode->fDisconnect = true;
1896 0 : }
1897 : }
1898 0 : }
1899 :
1900 : // Disconnect unused nodes
1901 0 : std::vector<CNode*> nodes_copy = m_nodes;
1902 0 : for (CNode* pnode : nodes_copy)
1903 : {
1904 0 : if (pnode->fDisconnect)
1905 : {
1906 : // remove from m_nodes
1907 0 : m_nodes.erase(remove(m_nodes.begin(), m_nodes.end(), pnode), m_nodes.end());
1908 :
1909 : // release outbound grant (if any)
1910 0 : pnode->grantOutbound.Release();
1911 :
1912 : // close socket and cleanup
1913 0 : pnode->CloseSocketDisconnect();
1914 :
1915 : // update connection count by network
1916 0 : if (pnode->IsManualOrFullOutboundConn()) --m_network_conn_counts[pnode->addr.GetNetwork()];
1917 :
1918 : // hold in disconnected pool until all refs are released
1919 0 : pnode->Release();
1920 0 : m_nodes_disconnected.push_back(pnode);
1921 0 : }
1922 : }
1923 0 : }
1924 : {
1925 : // Delete disconnected nodes
1926 0 : std::list<CNode*> nodes_disconnected_copy = m_nodes_disconnected;
1927 0 : for (CNode* pnode : nodes_disconnected_copy)
1928 : {
1929 : // Destroy the object only after other threads have stopped using it.
1930 0 : if (pnode->GetRefCount() <= 0) {
1931 0 : m_nodes_disconnected.remove(pnode);
1932 0 : DeleteNode(pnode);
1933 0 : }
1934 : }
1935 0 : }
1936 0 : }
1937 :
1938 0 : void CConnman::NotifyNumConnectionsChanged()
1939 : {
1940 : size_t nodes_size;
1941 : {
1942 0 : LOCK(m_nodes_mutex);
1943 0 : nodes_size = m_nodes.size();
1944 0 : }
1945 0 : if(nodes_size != nPrevNodeCount) {
1946 0 : nPrevNodeCount = nodes_size;
1947 0 : if (m_client_interface) {
1948 0 : m_client_interface->NotifyNumConnectionsChanged(nodes_size);
1949 0 : }
1950 0 : }
1951 0 : }
1952 :
1953 0 : bool CConnman::ShouldRunInactivityChecks(const CNode& node, std::chrono::seconds now) const
1954 : {
1955 0 : return node.m_connected + m_peer_connect_timeout < now;
1956 : }
1957 :
1958 0 : bool CConnman::InactivityCheck(const CNode& node) const
1959 : {
1960 : // Tests that see disconnects after using mocktime can start nodes with a
1961 : // large timeout. For example, -peertimeout=999999999.
1962 0 : const auto now{GetTime<std::chrono::seconds>()};
1963 0 : const auto last_send{node.m_last_send.load()};
1964 0 : const auto last_recv{node.m_last_recv.load()};
1965 :
1966 0 : if (!ShouldRunInactivityChecks(node, now)) return false;
1967 :
1968 0 : if (last_recv.count() == 0 || last_send.count() == 0) {
1969 0 : LogPrint(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());
1970 0 : return true;
1971 : }
1972 :
1973 0 : if (now > last_send + TIMEOUT_INTERVAL) {
1974 0 : LogPrint(BCLog::NET, "socket sending timeout: %is peer=%d\n", count_seconds(now - last_send), node.GetId());
1975 0 : return true;
1976 : }
1977 :
1978 0 : if (now > last_recv + TIMEOUT_INTERVAL) {
1979 0 : LogPrint(BCLog::NET, "socket receive timeout: %is peer=%d\n", count_seconds(now - last_recv), node.GetId());
1980 0 : return true;
1981 : }
1982 :
1983 0 : if (!node.fSuccessfullyConnected) {
1984 0 : LogPrint(BCLog::NET, "version handshake timeout peer=%d\n", node.GetId());
1985 0 : return true;
1986 : }
1987 :
1988 0 : return false;
1989 0 : }
1990 :
1991 0 : Sock::EventsPerSock CConnman::GenerateWaitSockets(Span<CNode* const> nodes)
1992 : {
1993 0 : Sock::EventsPerSock events_per_sock;
1994 :
1995 0 : for (const ListenSocket& hListenSocket : vhListenSocket) {
1996 0 : events_per_sock.emplace(hListenSocket.sock, Sock::Events{Sock::RECV});
1997 : }
1998 :
1999 0 : for (CNode* pnode : nodes) {
2000 0 : bool select_recv = !pnode->fPauseRecv;
2001 : bool select_send;
2002 : {
2003 0 : LOCK(pnode->cs_vSend);
2004 : // Sending is possible if either there are bytes to send right now, or if there will be
2005 : // once a potential message from vSendMsg is handed to the transport. GetBytesToSend
2006 : // determines both of these in a single call.
2007 0 : const auto& [to_send, more, _msg_type] = pnode->m_transport->GetBytesToSend(!pnode->vSendMsg.empty());
2008 0 : select_send = !to_send.empty() || more;
2009 0 : }
2010 0 : if (!select_recv && !select_send) continue;
2011 :
2012 0 : LOCK(pnode->m_sock_mutex);
2013 0 : if (pnode->m_sock) {
2014 0 : Sock::Event event = (select_send ? Sock::SEND : 0) | (select_recv ? Sock::RECV : 0);
2015 0 : events_per_sock.emplace(pnode->m_sock, Sock::Events{event});
2016 0 : }
2017 0 : }
2018 :
2019 0 : return events_per_sock;
2020 0 : }
2021 :
2022 0 : void CConnman::SocketHandler()
2023 : {
2024 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2025 :
2026 0 : Sock::EventsPerSock events_per_sock;
2027 :
2028 : {
2029 0 : const NodesSnapshot snap{*this, /*shuffle=*/false};
2030 :
2031 0 : const auto timeout = std::chrono::milliseconds(SELECT_TIMEOUT_MILLISECONDS);
2032 :
2033 : // Check for the readiness of the already connected sockets and the
2034 : // listening sockets in one call ("readiness" as in poll(2) or
2035 : // select(2)). If none are ready, wait for a short while and return
2036 : // empty sets.
2037 0 : events_per_sock = GenerateWaitSockets(snap.Nodes());
2038 0 : if (events_per_sock.empty() || !events_per_sock.begin()->first->WaitMany(timeout, events_per_sock)) {
2039 0 : interruptNet.sleep_for(timeout);
2040 0 : }
2041 :
2042 : // Service (send/receive) each of the already connected nodes.
2043 0 : SocketHandlerConnected(snap.Nodes(), events_per_sock);
2044 0 : }
2045 :
2046 : // Accept new connections from listening sockets.
2047 0 : SocketHandlerListening(events_per_sock);
2048 0 : }
2049 :
2050 0 : void CConnman::SocketHandlerConnected(const std::vector<CNode*>& nodes,
2051 : const Sock::EventsPerSock& events_per_sock)
2052 : {
2053 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2054 :
2055 0 : for (CNode* pnode : nodes) {
2056 0 : if (interruptNet)
2057 0 : return;
2058 :
2059 : //
2060 : // Receive
2061 : //
2062 0 : bool recvSet = false;
2063 0 : bool sendSet = false;
2064 0 : bool errorSet = false;
2065 : {
2066 0 : LOCK(pnode->m_sock_mutex);
2067 0 : if (!pnode->m_sock) {
2068 0 : continue;
2069 : }
2070 0 : const auto it = events_per_sock.find(pnode->m_sock);
2071 0 : if (it != events_per_sock.end()) {
2072 0 : recvSet = it->second.occurred & Sock::RECV;
2073 0 : sendSet = it->second.occurred & Sock::SEND;
2074 0 : errorSet = it->second.occurred & Sock::ERR;
2075 0 : }
2076 0 : }
2077 :
2078 0 : if (sendSet) {
2079 : // Send data
2080 0 : auto [bytes_sent, data_left] = WITH_LOCK(pnode->cs_vSend, return SocketSendData(*pnode));
2081 0 : if (bytes_sent) {
2082 0 : RecordBytesSent(bytes_sent);
2083 :
2084 : // If both receiving and (non-optimistic) sending were possible, we first attempt
2085 : // sending. If that succeeds, but does not fully drain the send queue, do not
2086 : // attempt to receive. This avoids needlessly queueing data if the remote peer
2087 : // is slow at receiving data, by means of TCP flow control. We only do this when
2088 : // sending actually succeeded to make sure progress is always made; otherwise a
2089 : // deadlock would be possible when both sides have data to send, but neither is
2090 : // receiving.
2091 0 : if (data_left) recvSet = false;
2092 0 : }
2093 0 : }
2094 :
2095 0 : if (recvSet || errorSet)
2096 : {
2097 : // typical socket buffer is 8K-64K
2098 : uint8_t pchBuf[0x10000];
2099 0 : int nBytes = 0;
2100 : {
2101 0 : LOCK(pnode->m_sock_mutex);
2102 0 : if (!pnode->m_sock) {
2103 0 : continue;
2104 : }
2105 0 : nBytes = pnode->m_sock->Recv(pchBuf, sizeof(pchBuf), MSG_DONTWAIT);
2106 0 : }
2107 0 : if (nBytes > 0)
2108 : {
2109 0 : bool notify = false;
2110 0 : if (!pnode->ReceiveMsgBytes({pchBuf, (size_t)nBytes}, notify)) {
2111 0 : pnode->CloseSocketDisconnect();
2112 0 : }
2113 0 : RecordBytesRecv(nBytes);
2114 0 : if (notify) {
2115 0 : pnode->MarkReceivedMsgsForProcessing();
2116 0 : WakeMessageHandler();
2117 0 : }
2118 0 : }
2119 0 : else if (nBytes == 0)
2120 : {
2121 : // socket closed gracefully
2122 0 : if (!pnode->fDisconnect) {
2123 0 : LogPrint(BCLog::NET, "socket closed for peer=%d\n", pnode->GetId());
2124 0 : }
2125 0 : pnode->CloseSocketDisconnect();
2126 0 : }
2127 0 : else if (nBytes < 0)
2128 : {
2129 : // error
2130 0 : int nErr = WSAGetLastError();
2131 0 : if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
2132 : {
2133 0 : if (!pnode->fDisconnect) {
2134 0 : LogPrint(BCLog::NET, "socket recv error for peer=%d: %s\n", pnode->GetId(), NetworkErrorString(nErr));
2135 0 : }
2136 0 : pnode->CloseSocketDisconnect();
2137 0 : }
2138 0 : }
2139 0 : }
2140 :
2141 0 : if (InactivityCheck(*pnode)) pnode->fDisconnect = true;
2142 : }
2143 0 : }
2144 :
2145 0 : void CConnman::SocketHandlerListening(const Sock::EventsPerSock& events_per_sock)
2146 : {
2147 0 : for (const ListenSocket& listen_socket : vhListenSocket) {
2148 0 : if (interruptNet) {
2149 0 : return;
2150 : }
2151 0 : const auto it = events_per_sock.find(listen_socket.sock);
2152 0 : if (it != events_per_sock.end() && it->second.occurred & Sock::RECV) {
2153 0 : AcceptConnection(listen_socket);
2154 0 : }
2155 : }
2156 0 : }
2157 :
2158 0 : void CConnman::ThreadSocketHandler()
2159 : {
2160 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
2161 :
2162 0 : while (!interruptNet)
2163 : {
2164 0 : DisconnectNodes();
2165 0 : NotifyNumConnectionsChanged();
2166 0 : SocketHandler();
2167 : }
2168 0 : }
2169 :
2170 0 : void CConnman::WakeMessageHandler()
2171 : {
2172 : {
2173 0 : LOCK(mutexMsgProc);
2174 0 : fMsgProcWake = true;
2175 0 : }
2176 0 : condMsgProc.notify_one();
2177 0 : }
2178 :
2179 0 : void CConnman::ThreadDNSAddressSeed()
2180 : {
2181 0 : FastRandomContext rng;
2182 0 : std::vector<std::string> seeds = m_params.DNSSeeds();
2183 0 : Shuffle(seeds.begin(), seeds.end(), rng);
2184 0 : int seeds_right_now = 0; // Number of seeds left before testing if we have enough connections
2185 0 : int found = 0;
2186 :
2187 0 : if (gArgs.GetBoolArg("-forcednsseed", DEFAULT_FORCEDNSSEED)) {
2188 : // When -forcednsseed is provided, query all.
2189 0 : seeds_right_now = seeds.size();
2190 0 : } else if (addrman.Size() == 0) {
2191 : // If we have no known peers, query all.
2192 : // This will occur on the first run, or if peers.dat has been
2193 : // deleted.
2194 0 : seeds_right_now = seeds.size();
2195 0 : }
2196 :
2197 : // goal: only query DNS seed if address need is acute
2198 : // * If we have a reasonable number of peers in addrman, spend
2199 : // some time trying them first. This improves user privacy by
2200 : // creating fewer identifying DNS requests, reduces trust by
2201 : // giving seeds less influence on the network topology, and
2202 : // reduces traffic to the seeds.
2203 : // * When querying DNS seeds query a few at once, this ensures
2204 : // that we don't give DNS seeds the ability to eclipse nodes
2205 : // that query them.
2206 : // * If we continue having problems, eventually query all the
2207 : // DNS seeds, and if that fails too, also try the fixed seeds.
2208 : // (done in ThreadOpenConnections)
2209 0 : const std::chrono::seconds seeds_wait_time = (addrman.Size() >= DNSSEEDS_DELAY_PEER_THRESHOLD ? DNSSEEDS_DELAY_MANY_PEERS : DNSSEEDS_DELAY_FEW_PEERS);
2210 :
2211 0 : for (const std::string& seed : seeds) {
2212 0 : if (seeds_right_now == 0) {
2213 0 : seeds_right_now += DNSSEEDS_TO_QUERY_AT_ONCE;
2214 :
2215 0 : if (addrman.Size() > 0) {
2216 0 : LogPrintf("Waiting %d seconds before querying DNS seeds.\n", seeds_wait_time.count());
2217 0 : std::chrono::seconds to_wait = seeds_wait_time;
2218 0 : while (to_wait.count() > 0) {
2219 : // if sleeping for the MANY_PEERS interval, wake up
2220 : // early to see if we have enough peers and can stop
2221 : // this thread entirely freeing up its resources
2222 0 : std::chrono::seconds w = std::min(DNSSEEDS_DELAY_FEW_PEERS, to_wait);
2223 0 : if (!interruptNet.sleep_for(w)) return;
2224 0 : to_wait -= w;
2225 :
2226 0 : int nRelevant = 0;
2227 : {
2228 0 : LOCK(m_nodes_mutex);
2229 0 : for (const CNode* pnode : m_nodes) {
2230 0 : if (pnode->fSuccessfullyConnected && pnode->IsFullOutboundConn()) ++nRelevant;
2231 : }
2232 0 : }
2233 0 : if (nRelevant >= 2) {
2234 0 : if (found > 0) {
2235 0 : LogPrintf("%d addresses found from DNS seeds\n", found);
2236 0 : LogPrintf("P2P peers available. Finished DNS seeding.\n");
2237 0 : } else {
2238 0 : LogPrintf("P2P peers available. Skipped DNS seeding.\n");
2239 : }
2240 0 : return;
2241 : }
2242 : }
2243 0 : }
2244 0 : }
2245 :
2246 0 : if (interruptNet) return;
2247 :
2248 : // hold off on querying seeds if P2P network deactivated
2249 0 : if (!fNetworkActive) {
2250 0 : LogPrintf("Waiting for network to be reactivated before querying DNS seeds.\n");
2251 0 : do {
2252 0 : if (!interruptNet.sleep_for(std::chrono::seconds{1})) return;
2253 0 : } while (!fNetworkActive);
2254 0 : }
2255 :
2256 0 : LogPrintf("Loading addresses from DNS seed %s\n", seed);
2257 : // If -proxy is in use, we make an ADDR_FETCH connection to the DNS resolved peer address
2258 : // for the base dns seed domain in chainparams
2259 0 : if (HaveNameProxy()) {
2260 0 : AddAddrFetch(seed);
2261 0 : } else {
2262 0 : std::vector<CAddress> vAdd;
2263 0 : ServiceFlags requiredServiceBits = GetDesirableServiceFlags(NODE_NONE);
2264 0 : std::string host = strprintf("x%x.%s", requiredServiceBits, seed);
2265 0 : CNetAddr resolveSource;
2266 0 : if (!resolveSource.SetInternal(host)) {
2267 0 : continue;
2268 : }
2269 0 : unsigned int nMaxIPs = 256; // Limits number of IPs learned from a DNS seed
2270 0 : const auto addresses{LookupHost(host, nMaxIPs, true)};
2271 0 : if (!addresses.empty()) {
2272 0 : for (const CNetAddr& ip : addresses) {
2273 0 : CAddress addr = CAddress(CService(ip, m_params.GetDefaultPort()), requiredServiceBits);
2274 0 : addr.nTime = rng.rand_uniform_delay(Now<NodeSeconds>() - 3 * 24h, -4 * 24h); // use a random age between 3 and 7 days old
2275 0 : vAdd.push_back(addr);
2276 0 : found++;
2277 0 : }
2278 0 : addrman.Add(vAdd, resolveSource);
2279 0 : } else {
2280 : // If the seed does not support a subdomain with our desired service bits,
2281 : // we make an ADDR_FETCH connection to the DNS resolved peer address for the
2282 : // base dns seed domain in chainparams
2283 0 : AddAddrFetch(seed);
2284 : }
2285 0 : }
2286 0 : --seeds_right_now;
2287 : }
2288 0 : LogPrintf("%d addresses found from DNS seeds\n", found);
2289 0 : }
2290 :
2291 0 : void CConnman::DumpAddresses()
2292 : {
2293 0 : const auto start{SteadyClock::now()};
2294 :
2295 0 : DumpPeerAddresses(::gArgs, addrman);
2296 :
2297 0 : LogPrint(BCLog::NET, "Flushed %d addresses to peers.dat %dms\n",
2298 : addrman.Size(), Ticks<std::chrono::milliseconds>(SteadyClock::now() - start));
2299 0 : }
2300 :
2301 0 : void CConnman::ProcessAddrFetch()
2302 : {
2303 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2304 0 : std::string strDest;
2305 : {
2306 0 : LOCK(m_addr_fetches_mutex);
2307 0 : if (m_addr_fetches.empty())
2308 0 : return;
2309 0 : strDest = m_addr_fetches.front();
2310 0 : m_addr_fetches.pop_front();
2311 0 : }
2312 0 : CAddress addr;
2313 0 : CSemaphoreGrant grant(*semOutbound, true);
2314 0 : if (grant) {
2315 0 : OpenNetworkConnection(addr, false, &grant, strDest.c_str(), ConnectionType::ADDR_FETCH);
2316 0 : }
2317 0 : }
2318 :
2319 0 : bool CConnman::GetTryNewOutboundPeer() const
2320 : {
2321 0 : return m_try_another_outbound_peer;
2322 : }
2323 :
2324 1 : void CConnman::SetTryNewOutboundPeer(bool flag)
2325 : {
2326 1 : m_try_another_outbound_peer = flag;
2327 1 : LogPrint(BCLog::NET, "setting try another outbound peer=%s\n", flag ? "true" : "false");
2328 1 : }
2329 :
2330 0 : void CConnman::StartExtraBlockRelayPeers()
2331 : {
2332 0 : LogPrint(BCLog::NET, "enabling extra block-relay-only peers\n");
2333 0 : m_start_extra_block_relay_peers = true;
2334 0 : }
2335 :
2336 : // Return the number of peers we have over our outbound connection limit
2337 : // Exclude peers that are marked for disconnect, or are going to be
2338 : // disconnected soon (eg ADDR_FETCH and FEELER)
2339 : // Also exclude peers that haven't finished initial connection handshake yet
2340 : // (so that we don't decide we're over our desired connection limit, and then
2341 : // evict some peer that has finished the handshake)
2342 0 : int CConnman::GetExtraFullOutboundCount() const
2343 : {
2344 0 : int full_outbound_peers = 0;
2345 : {
2346 0 : LOCK(m_nodes_mutex);
2347 0 : for (const CNode* pnode : m_nodes) {
2348 0 : if (pnode->fSuccessfullyConnected && !pnode->fDisconnect && pnode->IsFullOutboundConn()) {
2349 0 : ++full_outbound_peers;
2350 0 : }
2351 : }
2352 0 : }
2353 0 : return std::max(full_outbound_peers - m_max_outbound_full_relay, 0);
2354 0 : }
2355 :
2356 0 : int CConnman::GetExtraBlockRelayCount() const
2357 : {
2358 0 : int block_relay_peers = 0;
2359 : {
2360 0 : LOCK(m_nodes_mutex);
2361 0 : for (const CNode* pnode : m_nodes) {
2362 0 : if (pnode->fSuccessfullyConnected && !pnode->fDisconnect && pnode->IsBlockOnlyConn()) {
2363 0 : ++block_relay_peers;
2364 0 : }
2365 : }
2366 0 : }
2367 0 : return std::max(block_relay_peers - m_max_outbound_block_relay, 0);
2368 0 : }
2369 :
2370 0 : std::unordered_set<Network> CConnman::GetReachableEmptyNetworks() const
2371 : {
2372 0 : std::unordered_set<Network> networks{};
2373 0 : for (int n = 0; n < NET_MAX; n++) {
2374 0 : enum Network net = (enum Network)n;
2375 0 : if (net == NET_UNROUTABLE || net == NET_INTERNAL) continue;
2376 0 : if (IsReachable(net) && addrman.Size(net, std::nullopt) == 0) {
2377 0 : networks.insert(net);
2378 0 : }
2379 0 : }
2380 0 : return networks;
2381 0 : }
2382 :
2383 0 : bool CConnman::MultipleManualOrFullOutboundConns(Network net) const
2384 : {
2385 0 : AssertLockHeld(m_nodes_mutex);
2386 0 : return m_network_conn_counts[net] > 1;
2387 : }
2388 :
2389 0 : bool CConnman::MaybePickPreferredNetwork(std::optional<Network>& network)
2390 : {
2391 0 : std::array<Network, 5> nets{NET_IPV4, NET_IPV6, NET_ONION, NET_I2P, NET_CJDNS};
2392 0 : Shuffle(nets.begin(), nets.end(), FastRandomContext());
2393 :
2394 0 : LOCK(m_nodes_mutex);
2395 0 : for (const auto net : nets) {
2396 0 : if (IsReachable(net) && m_network_conn_counts[net] == 0 && addrman.Size(net) != 0) {
2397 0 : network = net;
2398 0 : return true;
2399 : }
2400 : }
2401 :
2402 0 : return false;
2403 0 : }
2404 :
2405 0 : void CConnman::ThreadOpenConnections(const std::vector<std::string> connect)
2406 : {
2407 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2408 0 : FastRandomContext rng;
2409 : // Connect to specific addresses
2410 0 : if (!connect.empty())
2411 : {
2412 0 : for (int64_t nLoop = 0;; nLoop++)
2413 : {
2414 0 : for (const std::string& strAddr : connect)
2415 : {
2416 0 : CAddress addr(CService(), NODE_NONE);
2417 0 : OpenNetworkConnection(addr, false, nullptr, strAddr.c_str(), ConnectionType::MANUAL);
2418 0 : for (int i = 0; i < 10 && i < nLoop; i++)
2419 : {
2420 0 : if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
2421 0 : return;
2422 0 : }
2423 0 : }
2424 0 : if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
2425 0 : return;
2426 0 : }
2427 : }
2428 :
2429 : // Initiate network connections
2430 0 : auto start = GetTime<std::chrono::microseconds>();
2431 :
2432 : // Minimum time before next feeler connection (in microseconds).
2433 0 : auto next_feeler = GetExponentialRand(start, FEELER_INTERVAL);
2434 0 : auto next_extra_block_relay = GetExponentialRand(start, EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL);
2435 0 : auto next_extra_network_peer{GetExponentialRand(start, EXTRA_NETWORK_PEER_INTERVAL)};
2436 0 : const bool dnsseed = gArgs.GetBoolArg("-dnsseed", DEFAULT_DNSSEED);
2437 0 : bool add_fixed_seeds = gArgs.GetBoolArg("-fixedseeds", DEFAULT_FIXEDSEEDS);
2438 0 : const bool use_seednodes{gArgs.IsArgSet("-seednode")};
2439 :
2440 0 : if (!add_fixed_seeds) {
2441 0 : LogPrintf("Fixed seeds are disabled\n");
2442 0 : }
2443 :
2444 0 : while (!interruptNet)
2445 : {
2446 0 : ProcessAddrFetch();
2447 :
2448 0 : if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
2449 0 : return;
2450 :
2451 0 : CSemaphoreGrant grant(*semOutbound);
2452 0 : if (interruptNet)
2453 0 : return;
2454 :
2455 0 : const std::unordered_set<Network> fixed_seed_networks{GetReachableEmptyNetworks()};
2456 0 : if (add_fixed_seeds && !fixed_seed_networks.empty()) {
2457 : // When the node starts with an empty peers.dat, there are a few other sources of peers before
2458 : // we fallback on to fixed seeds: -dnsseed, -seednode, -addnode
2459 : // If none of those are available, we fallback on to fixed seeds immediately, else we allow
2460 : // 60 seconds for any of those sources to populate addrman.
2461 0 : bool add_fixed_seeds_now = false;
2462 : // It is cheapest to check if enough time has passed first.
2463 0 : if (GetTime<std::chrono::seconds>() > start + std::chrono::minutes{1}) {
2464 0 : add_fixed_seeds_now = true;
2465 0 : LogPrintf("Adding fixed seeds as 60 seconds have passed and addrman is empty for at least one reachable network\n");
2466 0 : }
2467 :
2468 : // Perform cheap checks before locking a mutex.
2469 0 : else if (!dnsseed && !use_seednodes) {
2470 0 : LOCK(m_added_nodes_mutex);
2471 0 : if (m_added_nodes.empty()) {
2472 0 : add_fixed_seeds_now = true;
2473 0 : LogPrintf("Adding fixed seeds as -dnsseed=0 (or IPv4/IPv6 connections are disabled via -onlynet) and neither -addnode nor -seednode are provided\n");
2474 0 : }
2475 0 : }
2476 :
2477 0 : if (add_fixed_seeds_now) {
2478 0 : std::vector<CAddress> seed_addrs{ConvertSeeds(m_params.FixedSeeds())};
2479 : // We will not make outgoing connections to peers that are unreachable
2480 : // (e.g. because of -onlynet configuration).
2481 : // Therefore, we do not add them to addrman in the first place.
2482 : // In case previously unreachable networks become reachable
2483 : // (e.g. in case of -onlynet changes by the user), fixed seeds will
2484 : // be loaded only for networks for which we have no addresses.
2485 0 : seed_addrs.erase(std::remove_if(seed_addrs.begin(), seed_addrs.end(),
2486 0 : [&fixed_seed_networks](const CAddress& addr) { return fixed_seed_networks.count(addr.GetNetwork()) == 0; }),
2487 0 : seed_addrs.end());
2488 0 : CNetAddr local;
2489 0 : local.SetInternal("fixedseeds");
2490 0 : addrman.Add(seed_addrs, local);
2491 0 : add_fixed_seeds = false;
2492 0 : LogPrintf("Added %d fixed seeds from reachable networks.\n", seed_addrs.size());
2493 0 : }
2494 0 : }
2495 :
2496 : //
2497 : // Choose an address to connect to based on most recently seen
2498 : //
2499 0 : CAddress addrConnect;
2500 :
2501 : // Only connect out to one peer per ipv4/ipv6 network group (/16 for IPv4).
2502 0 : int nOutboundFullRelay = 0;
2503 0 : int nOutboundBlockRelay = 0;
2504 0 : int outbound_privacy_network_peers = 0;
2505 0 : std::set<std::vector<unsigned char>> outbound_ipv46_peer_netgroups;
2506 :
2507 : {
2508 0 : LOCK(m_nodes_mutex);
2509 0 : for (const CNode* pnode : m_nodes) {
2510 0 : if (pnode->IsFullOutboundConn()) nOutboundFullRelay++;
2511 0 : if (pnode->IsBlockOnlyConn()) nOutboundBlockRelay++;
2512 :
2513 : // Make sure our persistent outbound slots to ipv4/ipv6 peers belong to different netgroups.
2514 0 : switch (pnode->m_conn_type) {
2515 : // We currently don't take inbound connections into account. Since they are
2516 : // free to make, an attacker could make them to prevent us from connecting to
2517 : // certain peers.
2518 : case ConnectionType::INBOUND:
2519 : // Short-lived outbound connections should not affect how we select outbound
2520 : // peers from addrman.
2521 : case ConnectionType::ADDR_FETCH:
2522 : case ConnectionType::FEELER:
2523 0 : break;
2524 : case ConnectionType::MANUAL:
2525 : case ConnectionType::OUTBOUND_FULL_RELAY:
2526 : case ConnectionType::BLOCK_RELAY:
2527 0 : const CAddress address{pnode->addr};
2528 0 : if (address.IsTor() || address.IsI2P() || address.IsCJDNS()) {
2529 : // Since our addrman-groups for these networks are
2530 : // random, without relation to the route we
2531 : // take to connect to these peers or to the
2532 : // difficulty in obtaining addresses with diverse
2533 : // groups, we don't worry about diversity with
2534 : // respect to our addrman groups when connecting to
2535 : // these networks.
2536 0 : ++outbound_privacy_network_peers;
2537 0 : } else {
2538 0 : outbound_ipv46_peer_netgroups.insert(m_netgroupman.GetGroup(address));
2539 : }
2540 0 : } // no default case, so the compiler can warn about missing cases
2541 : }
2542 0 : }
2543 :
2544 0 : ConnectionType conn_type = ConnectionType::OUTBOUND_FULL_RELAY;
2545 0 : auto now = GetTime<std::chrono::microseconds>();
2546 0 : bool anchor = false;
2547 0 : bool fFeeler = false;
2548 0 : std::optional<Network> preferred_net;
2549 :
2550 : // Determine what type of connection to open. Opening
2551 : // BLOCK_RELAY connections to addresses from anchors.dat gets the highest
2552 : // priority. Then we open OUTBOUND_FULL_RELAY priority until we
2553 : // meet our full-relay capacity. Then we open BLOCK_RELAY connection
2554 : // until we hit our block-relay-only peer limit.
2555 : // GetTryNewOutboundPeer() gets set when a stale tip is detected, so we
2556 : // try opening an additional OUTBOUND_FULL_RELAY connection. If none of
2557 : // these conditions are met, check to see if it's time to try an extra
2558 : // block-relay-only peer (to confirm our tip is current, see below) or the next_feeler
2559 : // timer to decide if we should open a FEELER.
2560 :
2561 0 : if (!m_anchors.empty() && (nOutboundBlockRelay < m_max_outbound_block_relay)) {
2562 0 : conn_type = ConnectionType::BLOCK_RELAY;
2563 0 : anchor = true;
2564 0 : } else if (nOutboundFullRelay < m_max_outbound_full_relay) {
2565 : // OUTBOUND_FULL_RELAY
2566 0 : } else if (nOutboundBlockRelay < m_max_outbound_block_relay) {
2567 0 : conn_type = ConnectionType::BLOCK_RELAY;
2568 0 : } else if (GetTryNewOutboundPeer()) {
2569 : // OUTBOUND_FULL_RELAY
2570 0 : } else if (now > next_extra_block_relay && m_start_extra_block_relay_peers) {
2571 : // Periodically connect to a peer (using regular outbound selection
2572 : // methodology from addrman) and stay connected long enough to sync
2573 : // headers, but not much else.
2574 : //
2575 : // Then disconnect the peer, if we haven't learned anything new.
2576 : //
2577 : // The idea is to make eclipse attacks very difficult to pull off,
2578 : // because every few minutes we're finding a new peer to learn headers
2579 : // from.
2580 : //
2581 : // This is similar to the logic for trying extra outbound (full-relay)
2582 : // peers, except:
2583 : // - we do this all the time on an exponential timer, rather than just when
2584 : // our tip is stale
2585 : // - we potentially disconnect our next-youngest block-relay-only peer, if our
2586 : // newest block-relay-only peer delivers a block more recently.
2587 : // See the eviction logic in net_processing.cpp.
2588 : //
2589 : // Because we can promote these connections to block-relay-only
2590 : // connections, they do not get their own ConnectionType enum
2591 : // (similar to how we deal with extra outbound peers).
2592 0 : next_extra_block_relay = GetExponentialRand(now, EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL);
2593 0 : conn_type = ConnectionType::BLOCK_RELAY;
2594 0 : } else if (now > next_feeler) {
2595 0 : next_feeler = GetExponentialRand(now, FEELER_INTERVAL);
2596 0 : conn_type = ConnectionType::FEELER;
2597 0 : fFeeler = true;
2598 0 : } else if (nOutboundFullRelay == m_max_outbound_full_relay &&
2599 0 : m_max_outbound_full_relay == MAX_OUTBOUND_FULL_RELAY_CONNECTIONS &&
2600 0 : now > next_extra_network_peer &&
2601 0 : MaybePickPreferredNetwork(preferred_net)) {
2602 : // Full outbound connection management: Attempt to get at least one
2603 : // outbound peer from each reachable network by making extra connections
2604 : // and then protecting "only" peers from a network during outbound eviction.
2605 : // This is not attempted if the user changed -maxconnections to a value
2606 : // so low that less than MAX_OUTBOUND_FULL_RELAY_CONNECTIONS are made,
2607 : // to prevent interactions with otherwise protected outbound peers.
2608 0 : next_extra_network_peer = GetExponentialRand(now, EXTRA_NETWORK_PEER_INTERVAL);
2609 0 : } else {
2610 : // skip to next iteration of while loop
2611 0 : continue;
2612 : }
2613 :
2614 0 : addrman.ResolveCollisions();
2615 :
2616 0 : const auto current_time{NodeClock::now()};
2617 0 : int nTries = 0;
2618 0 : while (!interruptNet)
2619 : {
2620 0 : if (anchor && !m_anchors.empty()) {
2621 0 : const CAddress addr = m_anchors.back();
2622 0 : m_anchors.pop_back();
2623 0 : if (!addr.IsValid() || IsLocal(addr) || !IsReachable(addr) ||
2624 0 : !HasAllDesirableServiceFlags(addr.nServices) ||
2625 0 : outbound_ipv46_peer_netgroups.count(m_netgroupman.GetGroup(addr))) continue;
2626 0 : addrConnect = addr;
2627 0 : LogPrint(BCLog::NET, "Trying to make an anchor connection to %s\n", addrConnect.ToStringAddrPort());
2628 0 : break;
2629 0 : }
2630 :
2631 : // If we didn't find an appropriate destination after trying 100 addresses fetched from addrman,
2632 : // stop this loop, and let the outer loop run again (which sleeps, adds seed nodes, recalculates
2633 : // already-connected network ranges, ...) before trying new addrman addresses.
2634 0 : nTries++;
2635 0 : if (nTries > 100)
2636 0 : break;
2637 :
2638 0 : CAddress addr;
2639 0 : NodeSeconds addr_last_try{0s};
2640 :
2641 0 : if (fFeeler) {
2642 : // First, try to get a tried table collision address. This returns
2643 : // an empty (invalid) address if there are no collisions to try.
2644 0 : std::tie(addr, addr_last_try) = addrman.SelectTriedCollision();
2645 :
2646 0 : if (!addr.IsValid()) {
2647 : // No tried table collisions. Select a new table address
2648 : // for our feeler.
2649 0 : std::tie(addr, addr_last_try) = addrman.Select(true);
2650 0 : } else if (AlreadyConnectedToAddress(addr)) {
2651 : // If test-before-evict logic would have us connect to a
2652 : // peer that we're already connected to, just mark that
2653 : // address as Good(). We won't be able to initiate the
2654 : // connection anyway, so this avoids inadvertently evicting
2655 : // a currently-connected peer.
2656 0 : addrman.Good(addr);
2657 : // Select a new table address for our feeler instead.
2658 0 : std::tie(addr, addr_last_try) = addrman.Select(true);
2659 0 : }
2660 0 : } else {
2661 : // Not a feeler
2662 : // If preferred_net has a value set, pick an extra outbound
2663 : // peer from that network. The eviction logic in net_processing
2664 : // ensures that a peer from another network will be evicted.
2665 0 : std::tie(addr, addr_last_try) = addrman.Select(false, preferred_net);
2666 : }
2667 :
2668 : // Require outbound IPv4/IPv6 connections, other than feelers, to be to distinct network groups
2669 0 : if (!fFeeler && outbound_ipv46_peer_netgroups.count(m_netgroupman.GetGroup(addr))) {
2670 0 : continue;
2671 : }
2672 :
2673 : // if we selected an invalid or local address, restart
2674 0 : if (!addr.IsValid() || IsLocal(addr)) {
2675 0 : break;
2676 : }
2677 :
2678 0 : if (!IsReachable(addr))
2679 0 : continue;
2680 :
2681 : // only consider very recently tried nodes after 30 failed attempts
2682 0 : if (current_time - addr_last_try < 10min && nTries < 30) {
2683 0 : continue;
2684 : }
2685 :
2686 : // for non-feelers, require all the services we'll want,
2687 : // for feelers, only require they be a full node (only because most
2688 : // SPV clients don't have a good address DB available)
2689 0 : if (!fFeeler && !HasAllDesirableServiceFlags(addr.nServices)) {
2690 0 : continue;
2691 0 : } else if (fFeeler && !MayHaveUsefulAddressDB(addr.nServices)) {
2692 0 : continue;
2693 : }
2694 :
2695 : // Do not connect to bad ports, unless 50 invalid addresses have been selected already.
2696 0 : if (nTries < 50 && (addr.IsIPv4() || addr.IsIPv6()) && IsBadPort(addr.GetPort())) {
2697 0 : continue;
2698 : }
2699 :
2700 0 : addrConnect = addr;
2701 0 : break;
2702 0 : }
2703 :
2704 0 : if (addrConnect.IsValid()) {
2705 0 : if (fFeeler) {
2706 : // Add small amount of random noise before connection to avoid synchronization.
2707 0 : if (!interruptNet.sleep_for(rng.rand_uniform_duration<CThreadInterrupt::Clock>(FEELER_SLEEP_WINDOW))) {
2708 0 : return;
2709 : }
2710 0 : LogPrint(BCLog::NET, "Making feeler connection to %s\n", addrConnect.ToStringAddrPort());
2711 0 : }
2712 :
2713 0 : if (preferred_net != std::nullopt) LogPrint(BCLog::NET, "Making network specific connection to %s on %s.\n", addrConnect.ToStringAddrPort(), GetNetworkName(preferred_net.value()));
2714 :
2715 : // Record addrman failure attempts when node has at least 2 persistent outbound connections to peers with
2716 : // different netgroups in ipv4/ipv6 networks + all peers in Tor/I2P/CJDNS networks.
2717 : // Don't record addrman failure attempts when node is offline. This can be identified since all local
2718 : // network connections (if any) belong in the same netgroup, and the size of `outbound_ipv46_peer_netgroups` would only be 1.
2719 0 : const bool count_failures{((int)outbound_ipv46_peer_netgroups.size() + outbound_privacy_network_peers) >= std::min(nMaxConnections - 1, 2)};
2720 0 : OpenNetworkConnection(addrConnect, count_failures, &grant, /*strDest=*/nullptr, conn_type);
2721 0 : }
2722 0 : }
2723 0 : }
2724 :
2725 0 : std::vector<CAddress> CConnman::GetCurrentBlockRelayOnlyConns() const
2726 : {
2727 0 : std::vector<CAddress> ret;
2728 0 : LOCK(m_nodes_mutex);
2729 0 : for (const CNode* pnode : m_nodes) {
2730 0 : if (pnode->IsBlockOnlyConn()) {
2731 0 : ret.push_back(pnode->addr);
2732 0 : }
2733 : }
2734 :
2735 0 : return ret;
2736 0 : }
2737 :
2738 0 : std::vector<AddedNodeInfo> CConnman::GetAddedNodeInfo() const
2739 : {
2740 0 : std::vector<AddedNodeInfo> ret;
2741 :
2742 0 : std::list<std::string> lAddresses(0);
2743 : {
2744 0 : LOCK(m_added_nodes_mutex);
2745 0 : ret.reserve(m_added_nodes.size());
2746 0 : std::copy(m_added_nodes.cbegin(), m_added_nodes.cend(), std::back_inserter(lAddresses));
2747 0 : }
2748 :
2749 :
2750 : // Build a map of all already connected addresses (by IP:port and by name) to inbound/outbound and resolved CService
2751 0 : std::map<CService, bool> mapConnected;
2752 0 : std::map<std::string, std::pair<bool, CService>> mapConnectedByName;
2753 : {
2754 0 : LOCK(m_nodes_mutex);
2755 0 : for (const CNode* pnode : m_nodes) {
2756 0 : if (pnode->addr.IsValid()) {
2757 0 : mapConnected[pnode->addr] = pnode->IsInboundConn();
2758 0 : }
2759 0 : std::string addrName{pnode->m_addr_name};
2760 0 : if (!addrName.empty()) {
2761 0 : mapConnectedByName[std::move(addrName)] = std::make_pair(pnode->IsInboundConn(), static_cast<const CService&>(pnode->addr));
2762 0 : }
2763 0 : }
2764 0 : }
2765 :
2766 0 : for (const std::string& strAddNode : lAddresses) {
2767 0 : CService service(LookupNumeric(strAddNode, GetDefaultPort(strAddNode)));
2768 0 : AddedNodeInfo addedNode{strAddNode, CService(), false, false};
2769 0 : if (service.IsValid()) {
2770 : // strAddNode is an IP:port
2771 0 : auto it = mapConnected.find(service);
2772 0 : if (it != mapConnected.end()) {
2773 0 : addedNode.resolvedAddress = service;
2774 0 : addedNode.fConnected = true;
2775 0 : addedNode.fInbound = it->second;
2776 0 : }
2777 0 : } else {
2778 : // strAddNode is a name
2779 0 : auto it = mapConnectedByName.find(strAddNode);
2780 0 : if (it != mapConnectedByName.end()) {
2781 0 : addedNode.resolvedAddress = it->second.second;
2782 0 : addedNode.fConnected = true;
2783 0 : addedNode.fInbound = it->second.first;
2784 0 : }
2785 : }
2786 0 : ret.emplace_back(std::move(addedNode));
2787 0 : }
2788 :
2789 0 : return ret;
2790 0 : }
2791 :
2792 0 : void CConnman::ThreadOpenAddedConnections()
2793 : {
2794 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2795 0 : while (true)
2796 : {
2797 0 : CSemaphoreGrant grant(*semAddnode);
2798 0 : std::vector<AddedNodeInfo> vInfo = GetAddedNodeInfo();
2799 0 : bool tried = false;
2800 0 : for (const AddedNodeInfo& info : vInfo) {
2801 0 : if (!info.fConnected) {
2802 0 : if (!grant.TryAcquire()) {
2803 : // If we've used up our semaphore and need a new one, let's not wait here since while we are waiting
2804 : // the addednodeinfo state might change.
2805 0 : break;
2806 : }
2807 0 : tried = true;
2808 0 : CAddress addr(CService(), NODE_NONE);
2809 0 : OpenNetworkConnection(addr, false, &grant, info.strAddedNode.c_str(), ConnectionType::MANUAL);
2810 0 : if (!interruptNet.sleep_for(std::chrono::milliseconds(500)))
2811 0 : return;
2812 0 : }
2813 : }
2814 : // Retry every 60 seconds if a connection was attempted, otherwise two seconds
2815 0 : if (!interruptNet.sleep_for(std::chrono::seconds(tried ? 60 : 2)))
2816 0 : return;
2817 0 : }
2818 0 : }
2819 :
2820 : // if successful, this moves the passed grant to the constructed node
2821 0 : void CConnman::OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant *grantOutbound, const char *pszDest, ConnectionType conn_type)
2822 : {
2823 0 : AssertLockNotHeld(m_unused_i2p_sessions_mutex);
2824 0 : assert(conn_type != ConnectionType::INBOUND);
2825 :
2826 : //
2827 : // Initiate outbound network connection
2828 : //
2829 0 : if (interruptNet) {
2830 0 : return;
2831 : }
2832 0 : if (!fNetworkActive) {
2833 0 : return;
2834 : }
2835 0 : if (!pszDest) {
2836 0 : bool banned_or_discouraged = m_banman && (m_banman->IsDiscouraged(addrConnect) || m_banman->IsBanned(addrConnect));
2837 0 : if (IsLocal(addrConnect) || banned_or_discouraged || AlreadyConnectedToAddress(addrConnect)) {
2838 0 : return;
2839 : }
2840 0 : } else if (FindNode(std::string(pszDest)))
2841 0 : return;
2842 :
2843 0 : CNode* pnode = ConnectNode(addrConnect, pszDest, fCountFailure, conn_type);
2844 :
2845 0 : if (!pnode)
2846 0 : return;
2847 0 : if (grantOutbound)
2848 0 : grantOutbound->MoveTo(pnode->grantOutbound);
2849 :
2850 0 : m_msgproc->InitializeNode(*pnode, nLocalServices);
2851 : {
2852 0 : LOCK(m_nodes_mutex);
2853 0 : m_nodes.push_back(pnode);
2854 :
2855 : // update connection count by network
2856 0 : if (pnode->IsManualOrFullOutboundConn()) ++m_network_conn_counts[pnode->addr.GetNetwork()];
2857 0 : }
2858 0 : }
2859 :
2860 : Mutex NetEventsInterface::g_msgproc_mutex;
2861 :
2862 0 : void CConnman::ThreadMessageHandler()
2863 : {
2864 0 : LOCK(NetEventsInterface::g_msgproc_mutex);
2865 :
2866 0 : while (!flagInterruptMsgProc)
2867 : {
2868 0 : bool fMoreWork = false;
2869 :
2870 : {
2871 : // Randomize the order in which we process messages from/to our peers.
2872 : // This prevents attacks in which an attacker exploits having multiple
2873 : // consecutive connections in the m_nodes list.
2874 0 : const NodesSnapshot snap{*this, /*shuffle=*/true};
2875 :
2876 0 : for (CNode* pnode : snap.Nodes()) {
2877 0 : if (pnode->fDisconnect)
2878 0 : continue;
2879 :
2880 : // Receive messages
2881 0 : bool fMoreNodeWork = m_msgproc->ProcessMessages(pnode, flagInterruptMsgProc);
2882 0 : fMoreWork |= (fMoreNodeWork && !pnode->fPauseSend);
2883 0 : if (flagInterruptMsgProc)
2884 0 : return;
2885 : // Send messages
2886 0 : m_msgproc->SendMessages(pnode);
2887 :
2888 0 : if (flagInterruptMsgProc)
2889 0 : return;
2890 : }
2891 0 : }
2892 :
2893 0 : WAIT_LOCK(mutexMsgProc, lock);
2894 0 : if (!fMoreWork) {
2895 0 : condMsgProc.wait_until(lock, std::chrono::steady_clock::now() + std::chrono::milliseconds(100), [this]() EXCLUSIVE_LOCKS_REQUIRED(mutexMsgProc) { return fMsgProcWake; });
2896 0 : }
2897 0 : fMsgProcWake = false;
2898 0 : }
2899 0 : }
2900 :
2901 0 : void CConnman::ThreadI2PAcceptIncoming()
2902 : {
2903 : static constexpr auto err_wait_begin = 1s;
2904 : static constexpr auto err_wait_cap = 5min;
2905 0 : auto err_wait = err_wait_begin;
2906 :
2907 0 : bool advertising_listen_addr = false;
2908 0 : i2p::Connection conn;
2909 :
2910 0 : while (!interruptNet) {
2911 :
2912 0 : if (!m_i2p_sam_session->Listen(conn)) {
2913 0 : if (advertising_listen_addr && conn.me.IsValid()) {
2914 0 : RemoveLocal(conn.me);
2915 0 : advertising_listen_addr = false;
2916 0 : }
2917 :
2918 0 : interruptNet.sleep_for(err_wait);
2919 0 : if (err_wait < err_wait_cap) {
2920 0 : err_wait *= 2;
2921 0 : }
2922 :
2923 0 : continue;
2924 : }
2925 :
2926 0 : if (!advertising_listen_addr) {
2927 0 : AddLocal(conn.me, LOCAL_MANUAL);
2928 0 : advertising_listen_addr = true;
2929 0 : }
2930 :
2931 0 : if (!m_i2p_sam_session->Accept(conn)) {
2932 0 : continue;
2933 : }
2934 :
2935 0 : CreateNodeFromAcceptedSocket(std::move(conn.sock), NetPermissionFlags::None,
2936 0 : CAddress{conn.me, NODE_NONE}, CAddress{conn.peer, NODE_NONE});
2937 : }
2938 0 : }
2939 :
2940 0 : bool CConnman::BindListenPort(const CService& addrBind, bilingual_str& strError, NetPermissionFlags permissions)
2941 : {
2942 0 : int nOne = 1;
2943 :
2944 : // Create socket for listening for incoming connections
2945 : struct sockaddr_storage sockaddr;
2946 0 : socklen_t len = sizeof(sockaddr);
2947 0 : if (!addrBind.GetSockAddr((struct sockaddr*)&sockaddr, &len))
2948 : {
2949 0 : strError = strprintf(Untranslated("Bind address family for %s not supported"), addrBind.ToStringAddrPort());
2950 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Error, "%s\n", strError.original);
2951 0 : return false;
2952 : }
2953 :
2954 0 : std::unique_ptr<Sock> sock = CreateSock(addrBind);
2955 0 : if (!sock) {
2956 0 : strError = strprintf(Untranslated("Couldn't open socket for incoming connections (socket returned error %s)"), NetworkErrorString(WSAGetLastError()));
2957 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Error, "%s\n", strError.original);
2958 0 : return false;
2959 : }
2960 :
2961 : // Allow binding if the port is still in TIME_WAIT state after
2962 : // the program was closed and restarted.
2963 0 : if (sock->SetSockOpt(SOL_SOCKET, SO_REUSEADDR, (sockopt_arg_type)&nOne, sizeof(int)) == SOCKET_ERROR) {
2964 0 : strError = strprintf(Untranslated("Error setting SO_REUSEADDR on socket: %s, continuing anyway"), NetworkErrorString(WSAGetLastError()));
2965 0 : LogPrintf("%s\n", strError.original);
2966 0 : }
2967 :
2968 : // some systems don't have IPV6_V6ONLY but are always v6only; others do have the option
2969 : // and enable it by default or not. Try to enable it, if possible.
2970 0 : if (addrBind.IsIPv6()) {
2971 : #ifdef IPV6_V6ONLY
2972 0 : if (sock->SetSockOpt(IPPROTO_IPV6, IPV6_V6ONLY, (sockopt_arg_type)&nOne, sizeof(int)) == SOCKET_ERROR) {
2973 0 : strError = strprintf(Untranslated("Error setting IPV6_V6ONLY on socket: %s, continuing anyway"), NetworkErrorString(WSAGetLastError()));
2974 0 : LogPrintf("%s\n", strError.original);
2975 0 : }
2976 : #endif
2977 : #ifdef WIN32
2978 : int nProtLevel = PROTECTION_LEVEL_UNRESTRICTED;
2979 : if (sock->SetSockOpt(IPPROTO_IPV6, IPV6_PROTECTION_LEVEL, (const char*)&nProtLevel, sizeof(int)) == SOCKET_ERROR) {
2980 : strError = strprintf(Untranslated("Error setting IPV6_PROTECTION_LEVEL on socket: %s, continuing anyway"), NetworkErrorString(WSAGetLastError()));
2981 : LogPrintf("%s\n", strError.original);
2982 : }
2983 : #endif
2984 0 : }
2985 :
2986 0 : if (sock->Bind(reinterpret_cast<struct sockaddr*>(&sockaddr), len) == SOCKET_ERROR) {
2987 0 : int nErr = WSAGetLastError();
2988 0 : if (nErr == WSAEADDRINUSE)
2989 0 : strError = strprintf(_("Unable to bind to %s on this computer. %s is probably already running."), addrBind.ToStringAddrPort(), PACKAGE_NAME);
2990 : else
2991 0 : strError = strprintf(_("Unable to bind to %s on this computer (bind returned error %s)"), addrBind.ToStringAddrPort(), NetworkErrorString(nErr));
2992 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Error, "%s\n", strError.original);
2993 0 : return false;
2994 : }
2995 0 : LogPrintf("Bound to %s\n", addrBind.ToStringAddrPort());
2996 :
2997 : // Listen for incoming connections
2998 0 : if (sock->Listen(SOMAXCONN) == SOCKET_ERROR)
2999 : {
3000 0 : strError = strprintf(_("Listening for incoming connections failed (listen returned error %s)"), NetworkErrorString(WSAGetLastError()));
3001 0 : LogPrintLevel(BCLog::NET, BCLog::Level::Error, "%s\n", strError.original);
3002 0 : return false;
3003 : }
3004 :
3005 0 : vhListenSocket.emplace_back(std::move(sock), permissions);
3006 0 : return true;
3007 0 : }
3008 :
3009 0 : void Discover()
3010 : {
3011 0 : if (!fDiscover)
3012 0 : return;
3013 :
3014 : #ifdef WIN32
3015 : // Get local host IP
3016 : char pszHostName[256] = "";
3017 : if (gethostname(pszHostName, sizeof(pszHostName)) != SOCKET_ERROR)
3018 : {
3019 : const std::vector<CNetAddr> addresses{LookupHost(pszHostName, 0, true)};
3020 : for (const CNetAddr& addr : addresses)
3021 : {
3022 : if (AddLocal(addr, LOCAL_IF))
3023 : LogPrintf("%s: %s - %s\n", __func__, pszHostName, addr.ToStringAddr());
3024 : }
3025 : }
3026 : #elif (HAVE_DECL_GETIFADDRS && HAVE_DECL_FREEIFADDRS)
3027 : // Get local host ip
3028 : struct ifaddrs* myaddrs;
3029 0 : if (getifaddrs(&myaddrs) == 0)
3030 : {
3031 0 : for (struct ifaddrs* ifa = myaddrs; ifa != nullptr; ifa = ifa->ifa_next)
3032 : {
3033 0 : if (ifa->ifa_addr == nullptr) continue;
3034 0 : if ((ifa->ifa_flags & IFF_UP) == 0) continue;
3035 0 : if (strcmp(ifa->ifa_name, "lo") == 0) continue;
3036 0 : if (strcmp(ifa->ifa_name, "lo0") == 0) continue;
3037 0 : if (ifa->ifa_addr->sa_family == AF_INET)
3038 : {
3039 0 : struct sockaddr_in* s4 = (struct sockaddr_in*)(ifa->ifa_addr);
3040 0 : CNetAddr addr(s4->sin_addr);
3041 0 : if (AddLocal(addr, LOCAL_IF))
3042 0 : LogPrintf("%s: IPv4 %s: %s\n", __func__, ifa->ifa_name, addr.ToStringAddr());
3043 0 : }
3044 0 : else if (ifa->ifa_addr->sa_family == AF_INET6)
3045 : {
3046 0 : struct sockaddr_in6* s6 = (struct sockaddr_in6*)(ifa->ifa_addr);
3047 0 : CNetAddr addr(s6->sin6_addr);
3048 0 : if (AddLocal(addr, LOCAL_IF))
3049 0 : LogPrintf("%s: IPv6 %s: %s\n", __func__, ifa->ifa_name, addr.ToStringAddr());
3050 0 : }
3051 0 : }
3052 0 : freeifaddrs(myaddrs);
3053 0 : }
3054 : #endif
3055 0 : }
3056 :
3057 1 : void CConnman::SetNetworkActive(bool active)
3058 : {
3059 1 : LogPrintf("%s: %s\n", __func__, active);
3060 :
3061 1 : if (fNetworkActive == active) {
3062 1 : return;
3063 : }
3064 :
3065 0 : fNetworkActive = active;
3066 :
3067 0 : if (m_client_interface) {
3068 0 : m_client_interface->NotifyNetworkActiveChanged(fNetworkActive);
3069 0 : }
3070 1 : }
3071 :
3072 1 : CConnman::CConnman(uint64_t nSeed0In, uint64_t nSeed1In, AddrMan& addrman_in,
3073 : const NetGroupManager& netgroupman, const CChainParams& params, bool network_active)
3074 1 : : addrman(addrman_in)
3075 1 : , m_netgroupman{netgroupman}
3076 1 : , nSeed0(nSeed0In)
3077 1 : , nSeed1(nSeed1In)
3078 1 : , m_params(params)
3079 : {
3080 1 : SetTryNewOutboundPeer(false);
3081 :
3082 1 : Options connOptions;
3083 1 : Init(connOptions);
3084 1 : SetNetworkActive(network_active);
3085 1 : }
3086 :
3087 0 : NodeId CConnman::GetNewNodeId()
3088 : {
3089 0 : return nLastNodeId.fetch_add(1, std::memory_order_relaxed);
3090 : }
3091 :
3092 0 : uint16_t CConnman::GetDefaultPort(Network net) const
3093 : {
3094 0 : return net == NET_I2P ? I2P_SAM31_PORT : m_params.GetDefaultPort();
3095 : }
3096 :
3097 0 : uint16_t CConnman::GetDefaultPort(const std::string& addr) const
3098 : {
3099 0 : CNetAddr a;
3100 0 : return a.SetSpecial(addr) ? GetDefaultPort(a.GetNetwork()) : m_params.GetDefaultPort();
3101 0 : }
3102 :
3103 0 : bool CConnman::Bind(const CService& addr_, unsigned int flags, NetPermissionFlags permissions)
3104 : {
3105 0 : const CService addr{MaybeFlipIPv6toCJDNS(addr_)};
3106 :
3107 0 : bilingual_str strError;
3108 0 : if (!BindListenPort(addr, strError, permissions)) {
3109 0 : if ((flags & BF_REPORT_ERROR) && m_client_interface) {
3110 0 : m_client_interface->ThreadSafeMessageBox(strError, "", CClientUIInterface::MSG_ERROR);
3111 0 : }
3112 0 : return false;
3113 : }
3114 :
3115 0 : if (addr.IsRoutable() && fDiscover && !(flags & BF_DONT_ADVERTISE) && !NetPermissions::HasFlag(permissions, NetPermissionFlags::NoBan)) {
3116 0 : AddLocal(addr, LOCAL_BIND);
3117 0 : }
3118 :
3119 0 : return true;
3120 0 : }
3121 :
3122 0 : bool CConnman::InitBinds(const Options& options)
3123 : {
3124 0 : bool fBound = false;
3125 0 : for (const auto& addrBind : options.vBinds) {
3126 0 : fBound |= Bind(addrBind, BF_REPORT_ERROR, NetPermissionFlags::None);
3127 : }
3128 0 : for (const auto& addrBind : options.vWhiteBinds) {
3129 0 : fBound |= Bind(addrBind.m_service, BF_REPORT_ERROR, addrBind.m_flags);
3130 : }
3131 0 : for (const auto& addr_bind : options.onion_binds) {
3132 0 : fBound |= Bind(addr_bind, BF_DONT_ADVERTISE, NetPermissionFlags::None);
3133 : }
3134 0 : if (options.bind_on_any) {
3135 : struct in_addr inaddr_any;
3136 0 : inaddr_any.s_addr = htonl(INADDR_ANY);
3137 0 : struct in6_addr inaddr6_any = IN6ADDR_ANY_INIT;
3138 0 : fBound |= Bind(CService(inaddr6_any, GetListenPort()), BF_NONE, NetPermissionFlags::None);
3139 0 : fBound |= Bind(CService(inaddr_any, GetListenPort()), !fBound ? BF_REPORT_ERROR : BF_NONE, NetPermissionFlags::None);
3140 0 : }
3141 0 : return fBound;
3142 0 : }
3143 :
3144 0 : bool CConnman::Start(CScheduler& scheduler, const Options& connOptions)
3145 : {
3146 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3147 0 : Init(connOptions);
3148 :
3149 0 : if (fListen && !InitBinds(connOptions)) {
3150 0 : if (m_client_interface) {
3151 0 : m_client_interface->ThreadSafeMessageBox(
3152 0 : _("Failed to listen on any port. Use -listen=0 if you want this."),
3153 0 : "", CClientUIInterface::MSG_ERROR);
3154 0 : }
3155 0 : return false;
3156 : }
3157 :
3158 0 : Proxy i2p_sam;
3159 0 : if (GetProxy(NET_I2P, i2p_sam) && connOptions.m_i2p_accept_incoming) {
3160 0 : m_i2p_sam_session = std::make_unique<i2p::sam::Session>(gArgs.GetDataDirNet() / "i2p_private_key",
3161 0 : i2p_sam.proxy, &interruptNet);
3162 0 : }
3163 :
3164 0 : for (const auto& strDest : connOptions.vSeedNodes) {
3165 0 : AddAddrFetch(strDest);
3166 : }
3167 :
3168 0 : if (m_use_addrman_outgoing) {
3169 : // Load addresses from anchors.dat
3170 0 : m_anchors = ReadAnchors(gArgs.GetDataDirNet() / ANCHORS_DATABASE_FILENAME);
3171 0 : if (m_anchors.size() > MAX_BLOCK_RELAY_ONLY_ANCHORS) {
3172 0 : m_anchors.resize(MAX_BLOCK_RELAY_ONLY_ANCHORS);
3173 0 : }
3174 0 : LogPrintf("%i block-relay-only anchors will be tried for connections.\n", m_anchors.size());
3175 0 : }
3176 :
3177 0 : if (m_client_interface) {
3178 0 : m_client_interface->InitMessage(_("Starting network threads…").translated);
3179 0 : }
3180 :
3181 0 : fAddressesInitialized = true;
3182 :
3183 0 : if (semOutbound == nullptr) {
3184 : // initialize semaphore
3185 0 : semOutbound = std::make_unique<CSemaphore>(std::min(m_max_outbound, nMaxConnections));
3186 0 : }
3187 0 : if (semAddnode == nullptr) {
3188 : // initialize semaphore
3189 0 : semAddnode = std::make_unique<CSemaphore>(nMaxAddnode);
3190 0 : }
3191 :
3192 : //
3193 : // Start threads
3194 : //
3195 0 : assert(m_msgproc);
3196 0 : InterruptSocks5(false);
3197 0 : interruptNet.reset();
3198 0 : flagInterruptMsgProc = false;
3199 :
3200 : {
3201 0 : LOCK(mutexMsgProc);
3202 0 : fMsgProcWake = false;
3203 0 : }
3204 :
3205 : // Send and receive from sockets, accept connections
3206 0 : threadSocketHandler = std::thread(&util::TraceThread, "net", [this] { ThreadSocketHandler(); });
3207 :
3208 0 : if (!gArgs.GetBoolArg("-dnsseed", DEFAULT_DNSSEED))
3209 0 : LogPrintf("DNS seeding disabled\n");
3210 : else
3211 0 : threadDNSAddressSeed = std::thread(&util::TraceThread, "dnsseed", [this] { ThreadDNSAddressSeed(); });
3212 :
3213 : // Initiate manual connections
3214 0 : threadOpenAddedConnections = std::thread(&util::TraceThread, "addcon", [this] { ThreadOpenAddedConnections(); });
3215 :
3216 0 : if (connOptions.m_use_addrman_outgoing && !connOptions.m_specified_outgoing.empty()) {
3217 0 : if (m_client_interface) {
3218 0 : m_client_interface->ThreadSafeMessageBox(
3219 0 : _("Cannot provide specific connections and have addrman find outgoing connections at the same time."),
3220 0 : "", CClientUIInterface::MSG_ERROR);
3221 0 : }
3222 0 : return false;
3223 : }
3224 0 : if (connOptions.m_use_addrman_outgoing || !connOptions.m_specified_outgoing.empty()) {
3225 0 : threadOpenConnections = std::thread(
3226 0 : &util::TraceThread, "opencon",
3227 0 : [this, connect = connOptions.m_specified_outgoing] { ThreadOpenConnections(connect); });
3228 0 : }
3229 :
3230 : // Process messages
3231 0 : threadMessageHandler = std::thread(&util::TraceThread, "msghand", [this] { ThreadMessageHandler(); });
3232 :
3233 0 : if (m_i2p_sam_session) {
3234 0 : threadI2PAcceptIncoming =
3235 0 : std::thread(&util::TraceThread, "i2paccept", [this] { ThreadI2PAcceptIncoming(); });
3236 0 : }
3237 :
3238 : // Dump network addresses
3239 0 : scheduler.scheduleEvery([this] { DumpAddresses(); }, DUMP_PEERS_INTERVAL);
3240 :
3241 0 : return true;
3242 0 : }
3243 :
3244 : class CNetCleanup
3245 : {
3246 : public:
3247 : CNetCleanup() = default;
3248 :
3249 2 : ~CNetCleanup()
3250 : {
3251 : #ifdef WIN32
3252 : // Shutdown Windows Sockets
3253 : WSACleanup();
3254 : #endif
3255 2 : }
3256 : };
3257 : static CNetCleanup instance_of_cnetcleanup;
3258 :
3259 1 : void CConnman::Interrupt()
3260 : {
3261 : {
3262 1 : LOCK(mutexMsgProc);
3263 1 : flagInterruptMsgProc = true;
3264 1 : }
3265 1 : condMsgProc.notify_all();
3266 :
3267 1 : interruptNet();
3268 1 : InterruptSocks5(true);
3269 :
3270 1 : if (semOutbound) {
3271 0 : for (int i=0; i<m_max_outbound; i++) {
3272 0 : semOutbound->post();
3273 0 : }
3274 0 : }
3275 :
3276 1 : if (semAddnode) {
3277 0 : for (int i=0; i<nMaxAddnode; i++) {
3278 0 : semAddnode->post();
3279 0 : }
3280 0 : }
3281 1 : }
3282 :
3283 1 : void CConnman::StopThreads()
3284 : {
3285 1 : if (threadI2PAcceptIncoming.joinable()) {
3286 0 : threadI2PAcceptIncoming.join();
3287 0 : }
3288 1 : if (threadMessageHandler.joinable())
3289 0 : threadMessageHandler.join();
3290 1 : if (threadOpenConnections.joinable())
3291 0 : threadOpenConnections.join();
3292 1 : if (threadOpenAddedConnections.joinable())
3293 0 : threadOpenAddedConnections.join();
3294 1 : if (threadDNSAddressSeed.joinable())
3295 0 : threadDNSAddressSeed.join();
3296 1 : if (threadSocketHandler.joinable())
3297 0 : threadSocketHandler.join();
3298 1 : }
3299 :
3300 1 : void CConnman::StopNodes()
3301 : {
3302 1 : if (fAddressesInitialized) {
3303 0 : DumpAddresses();
3304 0 : fAddressesInitialized = false;
3305 :
3306 0 : if (m_use_addrman_outgoing) {
3307 : // Anchor connections are only dumped during clean shutdown.
3308 0 : std::vector<CAddress> anchors_to_dump = GetCurrentBlockRelayOnlyConns();
3309 0 : if (anchors_to_dump.size() > MAX_BLOCK_RELAY_ONLY_ANCHORS) {
3310 0 : anchors_to_dump.resize(MAX_BLOCK_RELAY_ONLY_ANCHORS);
3311 0 : }
3312 0 : DumpAnchors(gArgs.GetDataDirNet() / ANCHORS_DATABASE_FILENAME, anchors_to_dump);
3313 0 : }
3314 0 : }
3315 :
3316 : // Delete peer connections.
3317 1 : std::vector<CNode*> nodes;
3318 2 : WITH_LOCK(m_nodes_mutex, nodes.swap(m_nodes));
3319 1 : for (CNode* pnode : nodes) {
3320 0 : pnode->CloseSocketDisconnect();
3321 0 : DeleteNode(pnode);
3322 : }
3323 :
3324 1 : for (CNode* pnode : m_nodes_disconnected) {
3325 0 : DeleteNode(pnode);
3326 : }
3327 1 : m_nodes_disconnected.clear();
3328 1 : vhListenSocket.clear();
3329 1 : semOutbound.reset();
3330 1 : semAddnode.reset();
3331 1 : }
3332 :
3333 0 : void CConnman::DeleteNode(CNode* pnode)
3334 : {
3335 0 : assert(pnode);
3336 0 : m_msgproc->FinalizeNode(*pnode);
3337 0 : delete pnode;
3338 0 : }
3339 :
3340 1 : CConnman::~CConnman()
3341 : {
3342 1 : Interrupt();
3343 1 : Stop();
3344 1 : }
3345 :
3346 0 : std::vector<CAddress> CConnman::GetAddresses(size_t max_addresses, size_t max_pct, std::optional<Network> network) const
3347 : {
3348 0 : std::vector<CAddress> addresses = addrman.GetAddr(max_addresses, max_pct, network);
3349 0 : if (m_banman) {
3350 0 : addresses.erase(std::remove_if(addresses.begin(), addresses.end(),
3351 0 : [this](const CAddress& addr){return m_banman->IsDiscouraged(addr) || m_banman->IsBanned(addr);}),
3352 0 : addresses.end());
3353 0 : }
3354 0 : return addresses;
3355 0 : }
3356 :
3357 0 : std::vector<CAddress> CConnman::GetAddresses(CNode& requestor, size_t max_addresses, size_t max_pct)
3358 : {
3359 0 : auto local_socket_bytes = requestor.addrBind.GetAddrBytes();
3360 0 : uint64_t cache_id = GetDeterministicRandomizer(RANDOMIZER_ID_ADDRCACHE)
3361 0 : .Write(requestor.ConnectedThroughNetwork())
3362 0 : .Write(local_socket_bytes)
3363 : // For outbound connections, the port of the bound address is randomly
3364 : // assigned by the OS and would therefore not be useful for seeding.
3365 0 : .Write(requestor.IsInboundConn() ? requestor.addrBind.GetPort() : 0)
3366 0 : .Finalize();
3367 0 : const auto current_time = GetTime<std::chrono::microseconds>();
3368 0 : auto r = m_addr_response_caches.emplace(cache_id, CachedAddrResponse{});
3369 0 : CachedAddrResponse& cache_entry = r.first->second;
3370 0 : if (cache_entry.m_cache_entry_expiration < current_time) { // If emplace() added new one it has expiration 0.
3371 0 : cache_entry.m_addrs_response_cache = GetAddresses(max_addresses, max_pct, /*network=*/std::nullopt);
3372 : // Choosing a proper cache lifetime is a trade-off between the privacy leak minimization
3373 : // and the usefulness of ADDR responses to honest users.
3374 : //
3375 : // Longer cache lifetime makes it more difficult for an attacker to scrape
3376 : // enough AddrMan data to maliciously infer something useful.
3377 : // By the time an attacker scraped enough AddrMan records, most of
3378 : // the records should be old enough to not leak topology info by
3379 : // e.g. analyzing real-time changes in timestamps.
3380 : //
3381 : // It takes only several hundred requests to scrape everything from an AddrMan containing 100,000 nodes,
3382 : // so ~24 hours of cache lifetime indeed makes the data less inferable by the time
3383 : // most of it could be scraped (considering that timestamps are updated via
3384 : // ADDR self-announcements and when nodes communicate).
3385 : // We also should be robust to those attacks which may not require scraping *full* victim's AddrMan
3386 : // (because even several timestamps of the same handful of nodes may leak privacy).
3387 : //
3388 : // On the other hand, longer cache lifetime makes ADDR responses
3389 : // outdated and less useful for an honest requestor, e.g. if most nodes
3390 : // in the ADDR response are no longer active.
3391 : //
3392 : // However, the churn in the network is known to be rather low. Since we consider
3393 : // nodes to be "terrible" (see IsTerrible()) if the timestamps are older than 30 days,
3394 : // max. 24 hours of "penalty" due to cache shouldn't make any meaningful difference
3395 : // in terms of the freshness of the response.
3396 0 : cache_entry.m_cache_entry_expiration = current_time + std::chrono::hours(21) + GetRandMillis(std::chrono::hours(6));
3397 0 : }
3398 0 : return cache_entry.m_addrs_response_cache;
3399 0 : }
3400 :
3401 0 : bool CConnman::AddNode(const std::string& strNode)
3402 : {
3403 0 : LOCK(m_added_nodes_mutex);
3404 0 : for (const std::string& it : m_added_nodes) {
3405 0 : if (strNode == it) return false;
3406 : }
3407 :
3408 0 : m_added_nodes.push_back(strNode);
3409 0 : return true;
3410 0 : }
3411 :
3412 0 : bool CConnman::RemoveAddedNode(const std::string& strNode)
3413 : {
3414 0 : LOCK(m_added_nodes_mutex);
3415 0 : for(std::vector<std::string>::iterator it = m_added_nodes.begin(); it != m_added_nodes.end(); ++it) {
3416 0 : if (strNode == *it) {
3417 0 : m_added_nodes.erase(it);
3418 0 : return true;
3419 : }
3420 0 : }
3421 0 : return false;
3422 0 : }
3423 :
3424 0 : size_t CConnman::GetNodeCount(ConnectionDirection flags) const
3425 : {
3426 0 : LOCK(m_nodes_mutex);
3427 0 : if (flags == ConnectionDirection::Both) // Shortcut if we want total
3428 0 : return m_nodes.size();
3429 :
3430 0 : int nNum = 0;
3431 0 : for (const auto& pnode : m_nodes) {
3432 0 : if (flags & (pnode->IsInboundConn() ? ConnectionDirection::In : ConnectionDirection::Out)) {
3433 0 : nNum++;
3434 0 : }
3435 : }
3436 :
3437 0 : return nNum;
3438 0 : }
3439 :
3440 0 : uint32_t CConnman::GetMappedAS(const CNetAddr& addr) const
3441 : {
3442 0 : return m_netgroupman.GetMappedAS(addr);
3443 : }
3444 :
3445 0 : void CConnman::GetNodeStats(std::vector<CNodeStats>& vstats) const
3446 : {
3447 0 : vstats.clear();
3448 0 : LOCK(m_nodes_mutex);
3449 0 : vstats.reserve(m_nodes.size());
3450 0 : for (CNode* pnode : m_nodes) {
3451 0 : vstats.emplace_back();
3452 0 : pnode->CopyStats(vstats.back());
3453 0 : vstats.back().m_mapped_as = GetMappedAS(pnode->addr);
3454 : }
3455 0 : }
3456 :
3457 0 : bool CConnman::DisconnectNode(const std::string& strNode)
3458 : {
3459 0 : LOCK(m_nodes_mutex);
3460 0 : if (CNode* pnode = FindNode(strNode)) {
3461 0 : LogPrint(BCLog::NET, "disconnect by address%s matched peer=%d; disconnecting\n", (fLogIPs ? strprintf("=%s", strNode) : ""), pnode->GetId());
3462 0 : pnode->fDisconnect = true;
3463 0 : return true;
3464 : }
3465 0 : return false;
3466 0 : }
3467 :
3468 0 : bool CConnman::DisconnectNode(const CSubNet& subnet)
3469 : {
3470 0 : bool disconnected = false;
3471 0 : LOCK(m_nodes_mutex);
3472 0 : for (CNode* pnode : m_nodes) {
3473 0 : if (subnet.Match(pnode->addr)) {
3474 0 : LogPrint(BCLog::NET, "disconnect by subnet%s matched peer=%d; disconnecting\n", (fLogIPs ? strprintf("=%s", subnet.ToString()) : ""), pnode->GetId());
3475 0 : pnode->fDisconnect = true;
3476 0 : disconnected = true;
3477 0 : }
3478 : }
3479 0 : return disconnected;
3480 0 : }
3481 :
3482 0 : bool CConnman::DisconnectNode(const CNetAddr& addr)
3483 : {
3484 0 : return DisconnectNode(CSubNet(addr));
3485 0 : }
3486 :
3487 0 : bool CConnman::DisconnectNode(NodeId id)
3488 : {
3489 0 : LOCK(m_nodes_mutex);
3490 0 : for(CNode* pnode : m_nodes) {
3491 0 : if (id == pnode->GetId()) {
3492 0 : LogPrint(BCLog::NET, "disconnect by id peer=%d; disconnecting\n", pnode->GetId());
3493 0 : pnode->fDisconnect = true;
3494 0 : return true;
3495 : }
3496 : }
3497 0 : return false;
3498 0 : }
3499 :
3500 0 : void CConnman::RecordBytesRecv(uint64_t bytes)
3501 : {
3502 0 : nTotalBytesRecv += bytes;
3503 0 : }
3504 :
3505 0 : void CConnman::RecordBytesSent(uint64_t bytes)
3506 : {
3507 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3508 0 : LOCK(m_total_bytes_sent_mutex);
3509 :
3510 0 : nTotalBytesSent += bytes;
3511 :
3512 0 : const auto now = GetTime<std::chrono::seconds>();
3513 0 : if (nMaxOutboundCycleStartTime + MAX_UPLOAD_TIMEFRAME < now)
3514 : {
3515 : // timeframe expired, reset cycle
3516 0 : nMaxOutboundCycleStartTime = now;
3517 0 : nMaxOutboundTotalBytesSentInCycle = 0;
3518 0 : }
3519 :
3520 0 : nMaxOutboundTotalBytesSentInCycle += bytes;
3521 0 : }
3522 :
3523 0 : uint64_t CConnman::GetMaxOutboundTarget() const
3524 : {
3525 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3526 0 : LOCK(m_total_bytes_sent_mutex);
3527 0 : return nMaxOutboundLimit;
3528 0 : }
3529 :
3530 0 : std::chrono::seconds CConnman::GetMaxOutboundTimeframe() const
3531 : {
3532 0 : return MAX_UPLOAD_TIMEFRAME;
3533 : }
3534 :
3535 0 : std::chrono::seconds CConnman::GetMaxOutboundTimeLeftInCycle() const
3536 : {
3537 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3538 0 : LOCK(m_total_bytes_sent_mutex);
3539 0 : return GetMaxOutboundTimeLeftInCycle_();
3540 0 : }
3541 :
3542 0 : std::chrono::seconds CConnman::GetMaxOutboundTimeLeftInCycle_() const
3543 : {
3544 0 : AssertLockHeld(m_total_bytes_sent_mutex);
3545 :
3546 0 : if (nMaxOutboundLimit == 0)
3547 0 : return 0s;
3548 :
3549 0 : if (nMaxOutboundCycleStartTime.count() == 0)
3550 0 : return MAX_UPLOAD_TIMEFRAME;
3551 :
3552 0 : const std::chrono::seconds cycleEndTime = nMaxOutboundCycleStartTime + MAX_UPLOAD_TIMEFRAME;
3553 0 : const auto now = GetTime<std::chrono::seconds>();
3554 0 : return (cycleEndTime < now) ? 0s : cycleEndTime - now;
3555 0 : }
3556 :
3557 0 : bool CConnman::OutboundTargetReached(bool historicalBlockServingLimit) const
3558 : {
3559 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3560 0 : LOCK(m_total_bytes_sent_mutex);
3561 0 : if (nMaxOutboundLimit == 0)
3562 0 : return false;
3563 :
3564 0 : if (historicalBlockServingLimit)
3565 : {
3566 : // keep a large enough buffer to at least relay each block once
3567 0 : const std::chrono::seconds timeLeftInCycle = GetMaxOutboundTimeLeftInCycle_();
3568 0 : const uint64_t buffer = timeLeftInCycle / std::chrono::minutes{10} * MAX_BLOCK_SERIALIZED_SIZE;
3569 0 : if (buffer >= nMaxOutboundLimit || nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit - buffer)
3570 0 : return true;
3571 0 : }
3572 0 : else if (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit)
3573 0 : return true;
3574 :
3575 0 : return false;
3576 0 : }
3577 :
3578 0 : uint64_t CConnman::GetOutboundTargetBytesLeft() const
3579 : {
3580 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3581 0 : LOCK(m_total_bytes_sent_mutex);
3582 0 : if (nMaxOutboundLimit == 0)
3583 0 : return 0;
3584 :
3585 0 : return (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit) ? 0 : nMaxOutboundLimit - nMaxOutboundTotalBytesSentInCycle;
3586 0 : }
3587 :
3588 0 : uint64_t CConnman::GetTotalBytesRecv() const
3589 : {
3590 0 : return nTotalBytesRecv;
3591 : }
3592 :
3593 0 : uint64_t CConnman::GetTotalBytesSent() const
3594 : {
3595 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3596 0 : LOCK(m_total_bytes_sent_mutex);
3597 0 : return nTotalBytesSent;
3598 0 : }
3599 :
3600 0 : ServiceFlags CConnman::GetLocalServices() const
3601 : {
3602 0 : return nLocalServices;
3603 : }
3604 :
3605 0 : CNode::CNode(NodeId idIn,
3606 : std::shared_ptr<Sock> sock,
3607 : const CAddress& addrIn,
3608 : uint64_t nKeyedNetGroupIn,
3609 : uint64_t nLocalHostNonceIn,
3610 : const CAddress& addrBindIn,
3611 : const std::string& addrNameIn,
3612 : ConnectionType conn_type_in,
3613 : bool inbound_onion,
3614 : CNodeOptions&& node_opts)
3615 0 : : m_transport{std::make_unique<V1Transport>(idIn, SER_NETWORK, INIT_PROTO_VERSION)},
3616 0 : m_permission_flags{node_opts.permission_flags},
3617 0 : m_sock{sock},
3618 0 : m_connected{GetTime<std::chrono::seconds>()},
3619 0 : addr{addrIn},
3620 0 : addrBind{addrBindIn},
3621 0 : m_addr_name{addrNameIn.empty() ? addr.ToStringAddrPort() : addrNameIn},
3622 0 : m_inbound_onion{inbound_onion},
3623 0 : m_prefer_evict{node_opts.prefer_evict},
3624 0 : nKeyedNetGroup{nKeyedNetGroupIn},
3625 0 : m_conn_type{conn_type_in},
3626 0 : id{idIn},
3627 0 : nLocalHostNonce{nLocalHostNonceIn},
3628 0 : m_recv_flood_size{node_opts.recv_flood_size},
3629 0 : m_i2p_sam_session{std::move(node_opts.i2p_sam_session)}
3630 : {
3631 0 : if (inbound_onion) assert(conn_type_in == ConnectionType::INBOUND);
3632 :
3633 0 : for (const std::string &msg : getAllNetMessageTypes())
3634 0 : mapRecvBytesPerMsgType[msg] = 0;
3635 0 : mapRecvBytesPerMsgType[NET_MESSAGE_TYPE_OTHER] = 0;
3636 :
3637 0 : if (fLogIPs) {
3638 0 : LogPrint(BCLog::NET, "Added connection to %s peer=%d\n", m_addr_name, id);
3639 0 : } else {
3640 0 : LogPrint(BCLog::NET, "Added connection peer=%d\n", id);
3641 : }
3642 0 : }
3643 :
3644 0 : void CNode::MarkReceivedMsgsForProcessing()
3645 : {
3646 0 : AssertLockNotHeld(m_msg_process_queue_mutex);
3647 :
3648 0 : size_t nSizeAdded = 0;
3649 0 : for (const auto& msg : vRecvMsg) {
3650 : // vRecvMsg contains only completed CNetMessage
3651 : // the single possible partially deserialized message are held by TransportDeserializer
3652 0 : nSizeAdded += msg.m_raw_message_size;
3653 : }
3654 :
3655 0 : LOCK(m_msg_process_queue_mutex);
3656 0 : m_msg_process_queue.splice(m_msg_process_queue.end(), vRecvMsg);
3657 0 : m_msg_process_queue_size += nSizeAdded;
3658 0 : fPauseRecv = m_msg_process_queue_size > m_recv_flood_size;
3659 0 : }
3660 :
3661 0 : std::optional<std::pair<CNetMessage, bool>> CNode::PollMessage()
3662 : {
3663 0 : LOCK(m_msg_process_queue_mutex);
3664 0 : if (m_msg_process_queue.empty()) return std::nullopt;
3665 :
3666 0 : std::list<CNetMessage> msgs;
3667 : // Just take one message
3668 0 : msgs.splice(msgs.begin(), m_msg_process_queue, m_msg_process_queue.begin());
3669 0 : m_msg_process_queue_size -= msgs.front().m_raw_message_size;
3670 0 : fPauseRecv = m_msg_process_queue_size > m_recv_flood_size;
3671 :
3672 0 : return std::make_pair(std::move(msgs.front()), !m_msg_process_queue.empty());
3673 0 : }
3674 :
3675 0 : bool CConnman::NodeFullyConnected(const CNode* pnode)
3676 : {
3677 0 : return pnode && pnode->fSuccessfullyConnected && !pnode->fDisconnect;
3678 : }
3679 :
3680 0 : void CConnman::PushMessage(CNode* pnode, CSerializedNetMsg&& msg)
3681 : {
3682 0 : AssertLockNotHeld(m_total_bytes_sent_mutex);
3683 0 : size_t nMessageSize = msg.data.size();
3684 0 : LogPrint(BCLog::NET, "sending %s (%d bytes) peer=%d\n", msg.m_type, nMessageSize, pnode->GetId());
3685 0 : if (gArgs.GetBoolArg("-capturemessages", false)) {
3686 0 : CaptureMessage(pnode->addr, msg.m_type, msg.data, /*is_incoming=*/false);
3687 0 : }
3688 :
3689 : TRACE6(net, outbound_message,
3690 : pnode->GetId(),
3691 : pnode->m_addr_name.c_str(),
3692 : pnode->ConnectionTypeAsString().c_str(),
3693 : msg.m_type.c_str(),
3694 : msg.data.size(),
3695 : msg.data.data()
3696 : );
3697 :
3698 0 : size_t nBytesSent = 0;
3699 : {
3700 0 : LOCK(pnode->cs_vSend);
3701 : // Check if the transport still has unsent bytes, and indicate to it that we're about to
3702 : // give it a message to send.
3703 0 : const auto& [to_send, more, _msg_type] =
3704 0 : pnode->m_transport->GetBytesToSend(/*have_next_message=*/true);
3705 0 : const bool queue_was_empty{to_send.empty() && pnode->vSendMsg.empty()};
3706 :
3707 : // Update memory usage of send buffer.
3708 0 : pnode->m_send_memusage += msg.GetMemoryUsage();
3709 0 : if (pnode->m_send_memusage + pnode->m_transport->GetSendMemoryUsage() > nSendBufferMaxSize) pnode->fPauseSend = true;
3710 : // Move message to vSendMsg queue.
3711 0 : pnode->vSendMsg.push_back(std::move(msg));
3712 :
3713 : // If there was nothing to send before, and there is now (predicted by the "more" value
3714 : // returned by the GetBytesToSend call above), attempt "optimistic write":
3715 : // because the poll/select loop may pause for SELECT_TIMEOUT_MILLISECONDS before actually
3716 : // doing a send, try sending from the calling thread if the queue was empty before.
3717 : // With a V1Transport, more will always be true here, because adding a message always
3718 : // results in sendable bytes there, but with V2Transport this is not the case (it may
3719 : // still be in the handshake).
3720 0 : if (queue_was_empty && more) {
3721 0 : std::tie(nBytesSent, std::ignore) = SocketSendData(*pnode);
3722 0 : }
3723 0 : }
3724 0 : if (nBytesSent) RecordBytesSent(nBytesSent);
3725 0 : }
3726 :
3727 0 : bool CConnman::ForNode(NodeId id, std::function<bool(CNode* pnode)> func)
3728 : {
3729 0 : CNode* found = nullptr;
3730 0 : LOCK(m_nodes_mutex);
3731 0 : for (auto&& pnode : m_nodes) {
3732 0 : if(pnode->GetId() == id) {
3733 0 : found = pnode;
3734 0 : break;
3735 : }
3736 : }
3737 0 : return found != nullptr && NodeFullyConnected(found) && func(found);
3738 0 : }
3739 :
3740 0 : CSipHasher CConnman::GetDeterministicRandomizer(uint64_t id) const
3741 : {
3742 0 : return CSipHasher(nSeed0, nSeed1).Write(id);
3743 : }
3744 :
3745 0 : uint64_t CConnman::CalculateKeyedNetGroup(const CAddress& address) const
3746 : {
3747 0 : std::vector<unsigned char> vchNetGroup(m_netgroupman.GetGroup(address));
3748 :
3749 0 : return GetDeterministicRandomizer(RANDOMIZER_ID_NETGROUP).Write(vchNetGroup).Finalize();
3750 0 : }
3751 :
3752 : // Dump binary message to file, with timestamp.
3753 0 : static void CaptureMessageToFile(const CAddress& addr,
3754 : const std::string& msg_type,
3755 : Span<const unsigned char> data,
3756 : bool is_incoming)
3757 : {
3758 : // Note: This function captures the message at the time of processing,
3759 : // not at socket receive/send time.
3760 : // This ensures that the messages are always in order from an application
3761 : // layer (processing) perspective.
3762 0 : auto now = GetTime<std::chrono::microseconds>();
3763 :
3764 : // Windows folder names cannot include a colon
3765 0 : std::string clean_addr = addr.ToStringAddrPort();
3766 0 : std::replace(clean_addr.begin(), clean_addr.end(), ':', '_');
3767 :
3768 0 : fs::path base_path = gArgs.GetDataDirNet() / "message_capture" / fs::u8path(clean_addr);
3769 0 : fs::create_directories(base_path);
3770 :
3771 0 : fs::path path = base_path / (is_incoming ? "msgs_recv.dat" : "msgs_sent.dat");
3772 0 : AutoFile f{fsbridge::fopen(path, "ab")};
3773 :
3774 0 : ser_writedata64(f, now.count());
3775 0 : f << Span{msg_type};
3776 0 : for (auto i = msg_type.length(); i < CMessageHeader::COMMAND_SIZE; ++i) {
3777 0 : f << uint8_t{'\0'};
3778 0 : }
3779 0 : uint32_t size = data.size();
3780 0 : ser_writedata32(f, size);
3781 0 : f << data;
3782 0 : }
3783 :
3784 : std::function<void(const CAddress& addr,
3785 : const std::string& msg_type,
3786 : Span<const unsigned char> data,
3787 : bool is_incoming)>
3788 2 : CaptureMessage = CaptureMessageToFile;
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