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1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-2022 The Bitcoin Core developers
3 : : // Distributed under the MIT software license, see the accompanying
4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 : :
6 : : #ifndef BITCOIN_NET_H
7 : : #define BITCOIN_NET_H
8 : :
9 : : #include <bip324.h>
10 : : #include <chainparams.h>
11 : : #include <common/bloom.h>
12 : : #include <compat/compat.h>
13 : : #include <consensus/amount.h>
14 : : #include <crypto/siphash.h>
15 : : #include <hash.h>
16 : : #include <i2p.h>
17 : : #include <kernel/messagestartchars.h>
18 : : #include <net_permissions.h>
19 : : #include <netaddress.h>
20 : : #include <netbase.h>
21 : : #include <netgroup.h>
22 : : #include <node/connection_types.h>
23 : : #include <node/protocol_version.h>
24 : : #include <policy/feerate.h>
25 : : #include <protocol.h>
26 : : #include <random.h>
27 : : #include <span.h>
28 : : #include <streams.h>
29 : : #include <sync.h>
30 : : #include <uint256.h>
31 : : #include <util/check.h>
32 : : #include <util/sock.h>
33 : : #include <util/threadinterrupt.h>
34 : :
35 : : #include <atomic>
36 : : #include <condition_variable>
37 : : #include <cstdint>
38 : : #include <deque>
39 : : #include <functional>
40 : : #include <list>
41 : : #include <map>
42 : : #include <memory>
43 : : #include <optional>
44 : : #include <queue>
45 : : #include <thread>
46 : : #include <unordered_set>
47 : : #include <vector>
48 : :
49 : : class AddrMan;
50 : : class BanMan;
51 : : class CChainParams;
52 : : class CNode;
53 : : class CScheduler;
54 : : struct bilingual_str;
55 : :
56 : : /** Time after which to disconnect, after waiting for a ping response (or inactivity). */
57 : : static constexpr std::chrono::minutes TIMEOUT_INTERVAL{20};
58 : : /** Run the feeler connection loop once every 2 minutes. **/
59 : : static constexpr auto FEELER_INTERVAL = 2min;
60 : : /** Run the extra block-relay-only connection loop once every 5 minutes. **/
61 : : static constexpr auto EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL = 5min;
62 : : /** Maximum length of incoming protocol messages (no message over 4 MB is currently acceptable). */
63 : : static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 4 * 1000 * 1000;
64 : : /** Maximum length of the user agent string in `version` message */
65 : : static const unsigned int MAX_SUBVERSION_LENGTH = 256;
66 : : /** Maximum number of automatic outgoing nodes over which we'll relay everything (blocks, tx, addrs, etc) */
67 : : static const int MAX_OUTBOUND_FULL_RELAY_CONNECTIONS = 8;
68 : : /** Maximum number of addnode outgoing nodes */
69 : : static const int MAX_ADDNODE_CONNECTIONS = 8;
70 : : /** Maximum number of block-relay-only outgoing connections */
71 : : static const int MAX_BLOCK_RELAY_ONLY_CONNECTIONS = 2;
72 : : /** Maximum number of feeler connections */
73 : : static const int MAX_FEELER_CONNECTIONS = 1;
74 : : /** -listen default */
75 : : static const bool DEFAULT_LISTEN = true;
76 : : /** The maximum number of peer connections to maintain. */
77 : : static const unsigned int DEFAULT_MAX_PEER_CONNECTIONS = 125;
78 : : /** The default for -maxuploadtarget. 0 = Unlimited */
79 : : static const std::string DEFAULT_MAX_UPLOAD_TARGET{"0M"};
80 : : /** Default for blocks only*/
81 : : static const bool DEFAULT_BLOCKSONLY = false;
82 : : /** -peertimeout default */
83 : : static const int64_t DEFAULT_PEER_CONNECT_TIMEOUT = 60;
84 : : /** Number of file descriptors required for message capture **/
85 : : static const int NUM_FDS_MESSAGE_CAPTURE = 1;
86 : : /** Interval for ASMap Health Check **/
87 : : static constexpr std::chrono::hours ASMAP_HEALTH_CHECK_INTERVAL{24};
88 : :
89 : : static constexpr bool DEFAULT_FORCEDNSSEED{false};
90 : : static constexpr bool DEFAULT_DNSSEED{true};
91 : : static constexpr bool DEFAULT_FIXEDSEEDS{true};
92 : : static const size_t DEFAULT_MAXRECEIVEBUFFER = 5 * 1000;
93 : : static const size_t DEFAULT_MAXSENDBUFFER = 1 * 1000;
94 : :
95 : : static constexpr bool DEFAULT_V2_TRANSPORT{true};
96 : :
97 : : typedef int64_t NodeId;
98 : :
99 [ + - + - : 147 : struct AddedNodeParams {
+ - + - ]
[ + + ][ + -
+ - + - ]
100 : : std::string m_added_node;
101 : : bool m_use_v2transport;
102 : : };
103 : :
104 : 61 : struct AddedNodeInfo {
105 : : AddedNodeParams m_params;
106 : : CService resolvedAddress;
107 : : bool fConnected;
108 : : bool fInbound;
109 : : };
110 : :
111 : : class CNodeStats;
112 : : class CClientUIInterface;
113 : :
114 : 398454 : struct CSerializedNetMsg {
115 [ + - ]: 180208 : CSerializedNetMsg() = default;
116 : 199254 : CSerializedNetMsg(CSerializedNetMsg&&) = default;
117 : 176276 : CSerializedNetMsg& operator=(CSerializedNetMsg&&) = default;
118 : : // No implicit copying, only moves.
119 : : CSerializedNetMsg(const CSerializedNetMsg& msg) = delete;
120 : : CSerializedNetMsg& operator=(const CSerializedNetMsg&) = delete;
121 : :
122 : 20638 : CSerializedNetMsg Copy() const
123 : : {
124 [ + - ]: 20638 : CSerializedNetMsg copy;
125 [ + - ]: 20638 : copy.data = data;
126 [ + - ]: 20638 : copy.m_type = m_type;
127 : 20638 : return copy;
128 : 0 : }
129 : :
130 : : std::vector<unsigned char> data;
131 : : std::string m_type;
132 : :
133 : : /** Compute total memory usage of this object (own memory + any dynamic memory). */
134 : : size_t GetMemoryUsage() const noexcept;
135 : : };
136 : :
137 : : /**
138 : : * Look up IP addresses from all interfaces on the machine and add them to the
139 : : * list of local addresses to self-advertise.
140 : : * The loopback interface is skipped.
141 : : */
142 : : void Discover();
143 : :
144 : : uint16_t GetListenPort();
145 : :
146 : : enum
147 : : {
148 : : LOCAL_NONE, // unknown
149 : : LOCAL_IF, // address a local interface listens on
150 : : LOCAL_BIND, // address explicit bound to
151 : : LOCAL_MAPPED, // address reported by PCP
152 : : LOCAL_MANUAL, // address explicitly specified (-externalip=)
153 : :
154 : : LOCAL_MAX
155 : : };
156 : :
157 : : /** Returns a local address that we should advertise to this peer. */
158 : : std::optional<CService> GetLocalAddrForPeer(CNode& node);
159 : :
160 : : bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
161 : : bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
162 : : void RemoveLocal(const CService& addr);
163 : : bool SeenLocal(const CService& addr);
164 : : bool IsLocal(const CService& addr);
165 : : CService GetLocalAddress(const CNode& peer);
166 : :
167 : : extern bool fDiscover;
168 : : extern bool fListen;
169 : :
170 : : /** Subversion as sent to the P2P network in `version` messages */
171 : : extern std::string strSubVersion;
172 : :
173 : : struct LocalServiceInfo {
174 : : int nScore;
175 : : uint16_t nPort;
176 : : };
177 : :
178 : : extern GlobalMutex g_maplocalhost_mutex;
179 : : extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(g_maplocalhost_mutex);
180 : :
181 : : extern const std::string NET_MESSAGE_TYPE_OTHER;
182 : : using mapMsgTypeSize = std::map</* message type */ std::string, /* total bytes */ uint64_t>;
183 : :
184 : : class CNodeStats
185 : : {
186 : : public:
187 : : NodeId nodeid;
188 : : std::chrono::seconds m_last_send;
189 : : std::chrono::seconds m_last_recv;
190 : : std::chrono::seconds m_last_tx_time;
191 : : std::chrono::seconds m_last_block_time;
192 : : std::chrono::seconds m_connected;
193 : : std::string m_addr_name;
194 : : int nVersion;
195 : : std::string cleanSubVer;
196 : : bool fInbound;
197 : : // We requested high bandwidth connection to peer
198 : : bool m_bip152_highbandwidth_to;
199 : : // Peer requested high bandwidth connection
200 : : bool m_bip152_highbandwidth_from;
201 : : int m_starting_height;
202 : : uint64_t nSendBytes;
203 : : mapMsgTypeSize mapSendBytesPerMsgType;
204 : : uint64_t nRecvBytes;
205 : : mapMsgTypeSize mapRecvBytesPerMsgType;
206 : : NetPermissionFlags m_permission_flags;
207 : : std::chrono::microseconds m_last_ping_time;
208 : : std::chrono::microseconds m_min_ping_time;
209 : : // Our address, as reported by the peer
210 : : std::string addrLocal;
211 : : // Address of this peer
212 : : CAddress addr;
213 : : // Bind address of our side of the connection
214 : : CAddress addrBind;
215 : : // Network the peer connected through
216 : : Network m_network;
217 : : uint32_t m_mapped_as;
218 : : ConnectionType m_conn_type;
219 : : /** Transport protocol type. */
220 : : TransportProtocolType m_transport_type;
221 : : /** BIP324 session id string in hex, if any. */
222 : : std::string m_session_id;
223 : : };
224 : :
225 : :
226 : : /** Transport protocol agnostic message container.
227 : : * Ideally it should only contain receive time, payload,
228 : : * type and size.
229 : : */
230 : 722895 : class CNetMessage
231 : : {
232 : : public:
233 : : DataStream m_recv; //!< received message data
234 : : std::chrono::microseconds m_time{0}; //!< time of message receipt
235 : : uint32_t m_message_size{0}; //!< size of the payload
236 : : uint32_t m_raw_message_size{0}; //!< used wire size of the message (including header/checksum)
237 : : std::string m_type;
238 : :
239 [ + - ]: 180259 : explicit CNetMessage(DataStream&& recv_in) : m_recv(std::move(recv_in)) {}
240 : : // Only one CNetMessage object will exist for the same message on either
241 : : // the receive or processing queue. For performance reasons we therefore
242 : : // delete the copy constructor and assignment operator to avoid the
243 : : // possibility of copying CNetMessage objects.
244 : 542636 : CNetMessage(CNetMessage&&) = default;
245 : : CNetMessage(const CNetMessage&) = delete;
246 : : CNetMessage& operator=(CNetMessage&&) = default;
247 : : CNetMessage& operator=(const CNetMessage&) = delete;
248 : : };
249 : :
250 : : /** The Transport converts one connection's sent messages to wire bytes, and received bytes back. */
251 : 1920 : class Transport {
252 : : public:
253 : : virtual ~Transport() = default;
254 : :
255 [ + + ]: 1975 : struct Info
256 : : {
257 : : TransportProtocolType transport_type;
258 : : std::optional<uint256> session_id;
259 : : };
260 : :
261 : : /** Retrieve information about this transport. */
262 : : virtual Info GetInfo() const noexcept = 0;
263 : :
264 : : // 1. Receiver side functions, for decoding bytes received on the wire into transport protocol
265 : : // agnostic CNetMessage (message type & payload) objects.
266 : :
267 : : /** Returns true if the current message is complete (so GetReceivedMessage can be called). */
268 : : virtual bool ReceivedMessageComplete() const = 0;
269 : :
270 : : /** Feed wire bytes to the transport.
271 : : *
272 : : * @return false if some bytes were invalid, in which case the transport can't be used anymore.
273 : : *
274 : : * Consumed bytes are chopped off the front of msg_bytes.
275 : : */
276 : : virtual bool ReceivedBytes(Span<const uint8_t>& msg_bytes) = 0;
277 : :
278 : : /** Retrieve a completed message from transport.
279 : : *
280 : : * This can only be called when ReceivedMessageComplete() is true.
281 : : *
282 : : * If reject_message=true is returned the message itself is invalid, but (other than false
283 : : * returned by ReceivedBytes) the transport is not in an inconsistent state.
284 : : */
285 : : virtual CNetMessage GetReceivedMessage(std::chrono::microseconds time, bool& reject_message) = 0;
286 : :
287 : : // 2. Sending side functions, for converting messages into bytes to be sent over the wire.
288 : :
289 : : /** Set the next message to send.
290 : : *
291 : : * If no message can currently be set (perhaps because the previous one is not yet done being
292 : : * sent), returns false, and msg will be unmodified. Otherwise msg is enqueued (and
293 : : * possibly moved-from) and true is returned.
294 : : */
295 : : virtual bool SetMessageToSend(CSerializedNetMsg& msg) noexcept = 0;
296 : :
297 : : /** Return type for GetBytesToSend, consisting of:
298 : : * - Span<const uint8_t> to_send: span of bytes to be sent over the wire (possibly empty).
299 : : * - bool more: whether there will be more bytes to be sent after the ones in to_send are
300 : : * all sent (as signaled by MarkBytesSent()).
301 : : * - const std::string& m_type: message type on behalf of which this is being sent
302 : : * ("" for bytes that are not on behalf of any message).
303 : : */
304 : : using BytesToSend = std::tuple<
305 : : Span<const uint8_t> /*to_send*/,
306 : : bool /*more*/,
307 : : const std::string& /*m_type*/
308 : : >;
309 : :
310 : : /** Get bytes to send on the wire, if any, along with other information about it.
311 : : *
312 : : * As a const function, it does not modify the transport's observable state, and is thus safe
313 : : * to be called multiple times.
314 : : *
315 : : * @param[in] have_next_message If true, the "more" return value reports whether more will
316 : : * be sendable after a SetMessageToSend call. It is set by the caller when they know
317 : : * they have another message ready to send, and only care about what happens
318 : : * after that. The have_next_message argument only affects this "more" return value
319 : : * and nothing else.
320 : : *
321 : : * Effectively, there are three possible outcomes about whether there are more bytes
322 : : * to send:
323 : : * - Yes: the transport itself has more bytes to send later. For example, for
324 : : * V1Transport this happens during the sending of the header of a
325 : : * message, when there is a non-empty payload that follows.
326 : : * - No: the transport itself has no more bytes to send, but will have bytes to
327 : : * send if handed a message through SetMessageToSend. In V1Transport this
328 : : * happens when sending the payload of a message.
329 : : * - Blocked: the transport itself has no more bytes to send, and is also incapable
330 : : * of sending anything more at all now, if it were handed another
331 : : * message to send. This occurs in V2Transport before the handshake is
332 : : * complete, as the encryption ciphers are not set up for sending
333 : : * messages before that point.
334 : : *
335 : : * The boolean 'more' is true for Yes, false for Blocked, and have_next_message
336 : : * controls what is returned for No.
337 : : *
338 : : * @return a BytesToSend object. The to_send member returned acts as a stream which is only
339 : : * ever appended to. This means that with the exception of MarkBytesSent (which pops
340 : : * bytes off the front of later to_sends), operations on the transport can only append
341 : : * to what is being returned. Also note that m_type and to_send refer to data that is
342 : : * internal to the transport, and calling any non-const function on this object may
343 : : * invalidate them.
344 : : */
345 : : virtual BytesToSend GetBytesToSend(bool have_next_message) const noexcept = 0;
346 : :
347 : : /** Report how many bytes returned by the last GetBytesToSend() have been sent.
348 : : *
349 : : * bytes_sent cannot exceed to_send.size() of the last GetBytesToSend() result.
350 : : *
351 : : * If bytes_sent=0, this call has no effect.
352 : : */
353 : : virtual void MarkBytesSent(size_t bytes_sent) noexcept = 0;
354 : :
355 : : /** Return the memory usage of this transport attributable to buffered data to send. */
356 : : virtual size_t GetSendMemoryUsage() const noexcept = 0;
357 : :
358 : : // 3. Miscellaneous functions.
359 : :
360 : : /** Whether upon disconnections, a reconnect with V1 is warranted. */
361 : : virtual bool ShouldReconnectV1() const noexcept = 0;
362 : : };
363 : :
364 : : class V1Transport final : public Transport
365 : : {
366 : : private:
367 : : const MessageStartChars m_magic_bytes;
368 : : const NodeId m_node_id; // Only for logging
369 : : mutable Mutex m_recv_mutex; //!< Lock for receive state
370 : : mutable CHash256 hasher GUARDED_BY(m_recv_mutex);
371 : : mutable uint256 data_hash GUARDED_BY(m_recv_mutex);
372 : : bool in_data GUARDED_BY(m_recv_mutex); // parsing header (false) or data (true)
373 : : DataStream hdrbuf GUARDED_BY(m_recv_mutex){}; // partially received header
374 : : CMessageHeader hdr GUARDED_BY(m_recv_mutex); // complete header
375 : : DataStream vRecv GUARDED_BY(m_recv_mutex){}; // received message data
376 : : unsigned int nHdrPos GUARDED_BY(m_recv_mutex);
377 : : unsigned int nDataPos GUARDED_BY(m_recv_mutex);
378 : :
379 : : const uint256& GetMessageHash() const EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
380 : : int readHeader(Span<const uint8_t> msg_bytes) EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
381 : : int readData(Span<const uint8_t> msg_bytes) EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
382 : :
383 : 173883 : void Reset() EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex) {
384 : 173883 : AssertLockHeld(m_recv_mutex);
385 [ - + ]: 173883 : vRecv.clear();
386 [ - + ]: 173883 : hdrbuf.clear();
387 : 173883 : hdrbuf.resize(24);
388 : 173883 : in_data = false;
389 : 173883 : nHdrPos = 0;
390 : 173883 : nDataPos = 0;
391 : 173883 : data_hash.SetNull();
392 : 173883 : hasher.Reset();
393 : 173883 : }
394 : :
395 : 608666 : bool CompleteInternal() const noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex)
396 : : {
397 : 608666 : AssertLockHeld(m_recv_mutex);
398 [ + - ]: 172233 : if (!in_data) return false;
399 [ - + ]: 608654 : return hdr.nMessageSize == nDataPos;
400 : : }
401 : :
402 : : /** Lock for sending state. */
403 : : mutable Mutex m_send_mutex;
404 : : /** The header of the message currently being sent. */
405 : : std::vector<uint8_t> m_header_to_send GUARDED_BY(m_send_mutex);
406 : : /** The data of the message currently being sent. */
407 : : CSerializedNetMsg m_message_to_send GUARDED_BY(m_send_mutex);
408 : : /** Whether we're currently sending header bytes or message bytes. */
409 : : bool m_sending_header GUARDED_BY(m_send_mutex) {false};
410 : : /** How many bytes have been sent so far (from m_header_to_send, or from m_message_to_send.data). */
411 : : size_t m_bytes_sent GUARDED_BY(m_send_mutex) {0};
412 : :
413 : : public:
414 : : explicit V1Transport(const NodeId node_id) noexcept;
415 : :
416 : 436433 : bool ReceivedMessageComplete() const override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex)
417 : : {
418 : 436433 : AssertLockNotHeld(m_recv_mutex);
419 [ + + + - ]: 1309287 : return WITH_LOCK(m_recv_mutex, return CompleteInternal());
420 : : }
421 : :
422 : : Info GetInfo() const noexcept override;
423 : :
424 : 436437 : bool ReceivedBytes(Span<const uint8_t>& msg_bytes) override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex)
425 : : {
426 : 436437 : AssertLockNotHeld(m_recv_mutex);
427 : 436437 : LOCK(m_recv_mutex);
428 [ + + + - : 436437 : int ret = in_data ? readData(msg_bytes) : readHeader(msg_bytes);
+ - ]
429 [ + + ]: 436437 : if (ret < 0) {
430 [ + - ]: 5 : Reset();
431 : : } else {
432 : 436432 : msg_bytes = msg_bytes.subspan(ret);
433 : : }
434 [ + - ]: 436437 : return ret >= 0;
435 : 436437 : }
436 : :
437 : : CNetMessage GetReceivedMessage(std::chrono::microseconds time, bool& reject_message) override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex);
438 : :
439 : : bool SetMessageToSend(CSerializedNetMsg& msg) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
440 : : BytesToSend GetBytesToSend(bool have_next_message) const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
441 : : void MarkBytesSent(size_t bytes_sent) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
442 : : size_t GetSendMemoryUsage() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
443 : 661 : bool ShouldReconnectV1() const noexcept override { return false; }
444 : : };
445 : :
446 : : class V2Transport final : public Transport
447 : : {
448 : : private:
449 : : /** Contents of the version packet to send. BIP324 stipulates that senders should leave this
450 : : * empty, and receivers should ignore it. Future extensions can change what is sent as long as
451 : : * an empty version packet contents is interpreted as no extensions supported. */
452 : : static constexpr std::array<std::byte, 0> VERSION_CONTENTS = {};
453 : :
454 : : /** The length of the V1 prefix to match bytes initially received by responders with to
455 : : * determine if their peer is speaking V1 or V2. */
456 : : static constexpr size_t V1_PREFIX_LEN = 16;
457 : :
458 : : // The sender side and receiver side of V2Transport are state machines that are transitioned
459 : : // through, based on what has been received. The receive state corresponds to the contents of,
460 : : // and bytes received to, the receive buffer. The send state controls what can be appended to
461 : : // the send buffer and what can be sent from it.
462 : :
463 : : /** State type that defines the current contents of the receive buffer and/or how the next
464 : : * received bytes added to it will be interpreted.
465 : : *
466 : : * Diagram:
467 : : *
468 : : * start(responder)
469 : : * |
470 : : * | start(initiator) /---------\
471 : : * | | | |
472 : : * v v v |
473 : : * KEY_MAYBE_V1 -> KEY -> GARB_GARBTERM -> VERSION -> APP -> APP_READY
474 : : * |
475 : : * \-------> V1
476 : : */
477 : : enum class RecvState : uint8_t {
478 : : /** (Responder only) either v2 public key or v1 header.
479 : : *
480 : : * This is the initial state for responders, before data has been received to distinguish
481 : : * v1 from v2 connections. When that happens, the state becomes either KEY (for v2) or V1
482 : : * (for v1). */
483 : : KEY_MAYBE_V1,
484 : :
485 : : /** Public key.
486 : : *
487 : : * This is the initial state for initiators, during which the other side's public key is
488 : : * received. When that information arrives, the ciphers get initialized and the state
489 : : * becomes GARB_GARBTERM. */
490 : : KEY,
491 : :
492 : : /** Garbage and garbage terminator.
493 : : *
494 : : * Whenever a byte is received, the last 16 bytes are compared with the expected garbage
495 : : * terminator. When that happens, the state becomes VERSION. If no matching terminator is
496 : : * received in 4111 bytes (4095 for the maximum garbage length, and 16 bytes for the
497 : : * terminator), the connection aborts. */
498 : : GARB_GARBTERM,
499 : :
500 : : /** Version packet.
501 : : *
502 : : * A packet is received, and decrypted/verified. If that fails, the connection aborts. The
503 : : * first received packet in this state (whether it's a decoy or not) is expected to
504 : : * authenticate the garbage received during the GARB_GARBTERM state as associated
505 : : * authenticated data (AAD). The first non-decoy packet in this state is interpreted as
506 : : * version negotiation (currently, that means ignoring the contents, but it can be used for
507 : : * negotiating future extensions), and afterwards the state becomes APP. */
508 : : VERSION,
509 : :
510 : : /** Application packet.
511 : : *
512 : : * A packet is received, and decrypted/verified. If that succeeds, the state becomes
513 : : * APP_READY and the decrypted contents is kept in m_recv_decode_buffer until it is
514 : : * retrieved as a message by GetMessage(). */
515 : : APP,
516 : :
517 : : /** Nothing (an application packet is available for GetMessage()).
518 : : *
519 : : * Nothing can be received in this state. When the message is retrieved by GetMessage,
520 : : * the state becomes APP again. */
521 : : APP_READY,
522 : :
523 : : /** Nothing (this transport is using v1 fallback).
524 : : *
525 : : * All receive operations are redirected to m_v1_fallback. */
526 : : V1,
527 : : };
528 : :
529 : : /** State type that controls the sender side.
530 : : *
531 : : * Diagram:
532 : : *
533 : : * start(responder)
534 : : * |
535 : : * | start(initiator)
536 : : * | |
537 : : * v v
538 : : * MAYBE_V1 -> AWAITING_KEY -> READY
539 : : * |
540 : : * \-----> V1
541 : : */
542 : : enum class SendState : uint8_t {
543 : : /** (Responder only) Not sending until v1 or v2 is detected.
544 : : *
545 : : * This is the initial state for responders. The send buffer is empty.
546 : : * When the receiver determines whether this
547 : : * is a V1 or V2 connection, the sender state becomes AWAITING_KEY (for v2) or V1 (for v1).
548 : : */
549 : : MAYBE_V1,
550 : :
551 : : /** Waiting for the other side's public key.
552 : : *
553 : : * This is the initial state for initiators. The public key and garbage is sent out. When
554 : : * the receiver receives the other side's public key and transitions to GARB_GARBTERM, the
555 : : * sender state becomes READY. */
556 : : AWAITING_KEY,
557 : :
558 : : /** Normal sending state.
559 : : *
560 : : * In this state, the ciphers are initialized, so packets can be sent. When this state is
561 : : * entered, the garbage terminator and version packet are appended to the send buffer (in
562 : : * addition to the key and garbage which may still be there). In this state a message can be
563 : : * provided if the send buffer is empty. */
564 : : READY,
565 : :
566 : : /** This transport is using v1 fallback.
567 : : *
568 : : * All send operations are redirected to m_v1_fallback. */
569 : : V1,
570 : : };
571 : :
572 : : /** Cipher state. */
573 : : BIP324Cipher m_cipher;
574 : : /** Whether we are the initiator side. */
575 : : const bool m_initiating;
576 : : /** NodeId (for debug logging). */
577 : : const NodeId m_nodeid;
578 : : /** Encapsulate a V1Transport to fall back to. */
579 : : V1Transport m_v1_fallback;
580 : :
581 : : /** Lock for receiver-side fields. */
582 : : mutable Mutex m_recv_mutex ACQUIRED_BEFORE(m_send_mutex);
583 : : /** In {VERSION, APP}, the decrypted packet length, if m_recv_buffer.size() >=
584 : : * BIP324Cipher::LENGTH_LEN. Unspecified otherwise. */
585 : : uint32_t m_recv_len GUARDED_BY(m_recv_mutex) {0};
586 : : /** Receive buffer; meaning is determined by m_recv_state. */
587 : : std::vector<uint8_t> m_recv_buffer GUARDED_BY(m_recv_mutex);
588 : : /** AAD expected in next received packet (currently used only for garbage). */
589 : : std::vector<uint8_t> m_recv_aad GUARDED_BY(m_recv_mutex);
590 : : /** Buffer to put decrypted contents in, for converting to CNetMessage. */
591 : : std::vector<uint8_t> m_recv_decode_buffer GUARDED_BY(m_recv_mutex);
592 : : /** Current receiver state. */
593 : : RecvState m_recv_state GUARDED_BY(m_recv_mutex);
594 : :
595 : : /** Lock for sending-side fields. If both sending and receiving fields are accessed,
596 : : * m_recv_mutex must be acquired before m_send_mutex. */
597 : : mutable Mutex m_send_mutex ACQUIRED_AFTER(m_recv_mutex);
598 : : /** The send buffer; meaning is determined by m_send_state. */
599 : : std::vector<uint8_t> m_send_buffer GUARDED_BY(m_send_mutex);
600 : : /** How many bytes from the send buffer have been sent so far. */
601 : : uint32_t m_send_pos GUARDED_BY(m_send_mutex) {0};
602 : : /** The garbage sent, or to be sent (MAYBE_V1 and AWAITING_KEY state only). */
603 : : std::vector<uint8_t> m_send_garbage GUARDED_BY(m_send_mutex);
604 : : /** Type of the message being sent. */
605 : : std::string m_send_type GUARDED_BY(m_send_mutex);
606 : : /** Current sender state. */
607 : : SendState m_send_state GUARDED_BY(m_send_mutex);
608 : : /** Whether we've sent at least 24 bytes (which would trigger disconnect for V1 peers). */
609 : : bool m_sent_v1_header_worth GUARDED_BY(m_send_mutex) {false};
610 : :
611 : : /** Change the receive state. */
612 : : void SetReceiveState(RecvState recv_state) noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
613 : : /** Change the send state. */
614 : : void SetSendState(SendState send_state) noexcept EXCLUSIVE_LOCKS_REQUIRED(m_send_mutex);
615 : : /** Given a packet's contents, find the message type (if valid), and strip it from contents. */
616 : : static std::optional<std::string> GetMessageType(Span<const uint8_t>& contents) noexcept;
617 : : /** Determine how many received bytes can be processed in one go (not allowed in V1 state). */
618 : : size_t GetMaxBytesToProcess() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
619 : : /** Put our public key + garbage in the send buffer. */
620 : : void StartSendingHandshake() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_send_mutex);
621 : : /** Process bytes in m_recv_buffer, while in KEY_MAYBE_V1 state. */
622 : : void ProcessReceivedMaybeV1Bytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex, !m_send_mutex);
623 : : /** Process bytes in m_recv_buffer, while in KEY state. */
624 : : bool ProcessReceivedKeyBytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex, !m_send_mutex);
625 : : /** Process bytes in m_recv_buffer, while in GARB_GARBTERM state. */
626 : : bool ProcessReceivedGarbageBytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
627 : : /** Process bytes in m_recv_buffer, while in VERSION/APP state. */
628 : : bool ProcessReceivedPacketBytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
629 : :
630 : : public:
631 : : static constexpr uint32_t MAX_GARBAGE_LEN = 4095;
632 : :
633 : : /** Construct a V2 transport with securely generated random keys.
634 : : *
635 : : * @param[in] nodeid the node's NodeId (only for debug log output).
636 : : * @param[in] initiating whether we are the initiator side.
637 : : */
638 : : V2Transport(NodeId nodeid, bool initiating) noexcept;
639 : :
640 : : /** Construct a V2 transport with specified keys and garbage (test use only). */
641 : : V2Transport(NodeId nodeid, bool initiating, const CKey& key, Span<const std::byte> ent32, std::vector<uint8_t> garbage) noexcept;
642 : :
643 : : // Receive side functions.
644 : : bool ReceivedMessageComplete() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex);
645 : : bool ReceivedBytes(Span<const uint8_t>& msg_bytes) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex, !m_send_mutex);
646 : : CNetMessage GetReceivedMessage(std::chrono::microseconds time, bool& reject_message) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex);
647 : :
648 : : // Send side functions.
649 : : bool SetMessageToSend(CSerializedNetMsg& msg) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
650 : : BytesToSend GetBytesToSend(bool have_next_message) const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
651 : : void MarkBytesSent(size_t bytes_sent) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
652 : : size_t GetSendMemoryUsage() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
653 : :
654 : : // Miscellaneous functions.
655 : : bool ShouldReconnectV1() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex, !m_send_mutex);
656 : : Info GetInfo() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex);
657 : : };
658 : :
659 : 1570 : struct CNodeOptions
660 : : {
661 : : NetPermissionFlags permission_flags = NetPermissionFlags::None;
662 : : std::unique_ptr<i2p::sam::Session> i2p_sam_session = nullptr;
663 : : bool prefer_evict = false;
664 : : size_t recv_flood_size{DEFAULT_MAXRECEIVEBUFFER * 1000};
665 : : bool use_v2transport = false;
666 : : };
667 : :
668 : : /** Information about a peer */
669 : : class CNode
670 : : {
671 : : public:
672 : : /** Transport serializer/deserializer. The receive side functions are only called under cs_vRecv, while
673 : : * the sending side functions are only called under cs_vSend. */
674 : : const std::unique_ptr<Transport> m_transport;
675 : :
676 : : const NetPermissionFlags m_permission_flags;
677 : :
678 : : /**
679 : : * Socket used for communication with the node.
680 : : * May not own a Sock object (after `CloseSocketDisconnect()` or during tests).
681 : : * `shared_ptr` (instead of `unique_ptr`) is used to avoid premature close of
682 : : * the underlying file descriptor by one thread while another thread is
683 : : * poll(2)-ing it for activity.
684 : : * @see https://github.com/bitcoin/bitcoin/issues/21744 for details.
685 : : */
686 : : std::shared_ptr<Sock> m_sock GUARDED_BY(m_sock_mutex);
687 : :
688 : : /** Sum of GetMemoryUsage of all vSendMsg entries. */
689 : : size_t m_send_memusage GUARDED_BY(cs_vSend){0};
690 : : /** Total number of bytes sent on the wire to this peer. */
691 : : uint64_t nSendBytes GUARDED_BY(cs_vSend){0};
692 : : /** Messages still to be fed to m_transport->SetMessageToSend. */
693 : : std::deque<CSerializedNetMsg> vSendMsg GUARDED_BY(cs_vSend);
694 : : Mutex cs_vSend;
695 : : Mutex m_sock_mutex;
696 : : Mutex cs_vRecv;
697 : :
698 : : uint64_t nRecvBytes GUARDED_BY(cs_vRecv){0};
699 : :
700 : : std::atomic<std::chrono::seconds> m_last_send{0s};
701 : : std::atomic<std::chrono::seconds> m_last_recv{0s};
702 : : //! Unix epoch time at peer connection
703 : : const std::chrono::seconds m_connected;
704 : : // Address of this peer
705 : : const CAddress addr;
706 : : // Bind address of our side of the connection
707 : : const CAddress addrBind;
708 : : const std::string m_addr_name;
709 : : /** The pszDest argument provided to ConnectNode(). Only used for reconnections. */
710 : : const std::string m_dest;
711 : : //! Whether this peer is an inbound onion, i.e. connected via our Tor onion service.
712 : : const bool m_inbound_onion;
713 : : std::atomic<int> nVersion{0};
714 : : Mutex m_subver_mutex;
715 : : /**
716 : : * cleanSubVer is a sanitized string of the user agent byte array we read
717 : : * from the wire. This cleaned string can safely be logged or displayed.
718 : : */
719 : : std::string cleanSubVer GUARDED_BY(m_subver_mutex){};
720 : : const bool m_prefer_evict{false}; // This peer is preferred for eviction.
721 : 918940 : bool HasPermission(NetPermissionFlags permission) const {
722 [ + + - - : 918938 : return NetPermissions::HasFlag(m_permission_flags, permission);
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723 : : }
724 : : /** fSuccessfullyConnected is set to true on receiving VERACK from the peer. */
725 : : std::atomic_bool fSuccessfullyConnected{false};
726 : : // Setting fDisconnect to true will cause the node to be disconnected the
727 : : // next time DisconnectNodes() runs
728 : : std::atomic_bool fDisconnect{false};
729 : : CSemaphoreGrant grantOutbound;
730 : : std::atomic<int> nRefCount{0};
731 : :
732 : : const uint64_t nKeyedNetGroup;
733 : : std::atomic_bool fPauseRecv{false};
734 : : std::atomic_bool fPauseSend{false};
735 : :
736 : : const ConnectionType m_conn_type;
737 : :
738 : : /** Move all messages from the received queue to the processing queue. */
739 : : void MarkReceivedMsgsForProcessing()
740 : : EXCLUSIVE_LOCKS_REQUIRED(!m_msg_process_queue_mutex);
741 : :
742 : : /** Poll the next message from the processing queue of this connection.
743 : : *
744 : : * Returns std::nullopt if the processing queue is empty, or a pair
745 : : * consisting of the message and a bool that indicates if the processing
746 : : * queue has more entries. */
747 : : std::optional<std::pair<CNetMessage, bool>> PollMessage()
748 : : EXCLUSIVE_LOCKS_REQUIRED(!m_msg_process_queue_mutex);
749 : :
750 : : /** Account for the total size of a sent message in the per msg type connection stats. */
751 : 356035 : void AccountForSentBytes(const std::string& msg_type, size_t sent_bytes)
752 : : EXCLUSIVE_LOCKS_REQUIRED(cs_vSend)
753 : : {
754 : 356035 : mapSendBytesPerMsgType[msg_type] += sent_bytes;
755 : 356035 : }
756 : :
757 : 427370 : bool IsOutboundOrBlockRelayConn() const {
758 [ + - + ]: 427370 : switch (m_conn_type) {
759 : : case ConnectionType::OUTBOUND_FULL_RELAY:
760 : : case ConnectionType::BLOCK_RELAY:
761 : : return true;
762 : 420998 : case ConnectionType::INBOUND:
763 : 420998 : case ConnectionType::MANUAL:
764 : 420998 : case ConnectionType::ADDR_FETCH:
765 : 420998 : case ConnectionType::FEELER:
766 : 420998 : return false;
767 : : } // no default case, so the compiler can warn about missing cases
768 : :
769 : 0 : assert(false);
770 : : }
771 : :
772 : 6705 : bool IsFullOutboundConn() const {
773 [ + - + + : 6705 : return m_conn_type == ConnectionType::OUTBOUND_FULL_RELAY;
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774 : : }
775 : :
776 : 184 : bool IsManualConn() const {
777 [ + + ][ + - : 184 : return m_conn_type == ConnectionType::MANUAL;
+ - + - +
- ]
778 : : }
779 : :
780 : 1415 : bool IsManualOrFullOutboundConn() const
781 : : {
782 [ + - + ]: 1415 : switch (m_conn_type) {
783 : : case ConnectionType::INBOUND:
784 : : case ConnectionType::FEELER:
785 : : case ConnectionType::BLOCK_RELAY:
786 : : case ConnectionType::ADDR_FETCH:
787 : : return false;
788 : 817 : case ConnectionType::OUTBOUND_FULL_RELAY:
789 : 817 : case ConnectionType::MANUAL:
790 : 817 : return true;
791 : : } // no default case, so the compiler can warn about missing cases
792 : :
793 : 0 : assert(false);
794 : : }
795 : :
796 : 458502 : bool IsBlockOnlyConn() const {
797 [ + + + + : 458502 : return m_conn_type == ConnectionType::BLOCK_RELAY;
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798 : : }
799 : :
800 : 1469 : bool IsFeelerConn() const {
801 [ + + ][ + - : 1469 : return m_conn_type == ConnectionType::FEELER;
+ - + - +
- ]
802 : : }
803 : :
804 : 601927 : bool IsAddrFetchConn() const {
805 [ + + + + : 601927 : return m_conn_type == ConnectionType::ADDR_FETCH;
+ + + + ]
806 : : }
807 : :
808 : 930661 : bool IsInboundConn() const {
809 [ + + + + : 928651 : return m_conn_type == ConnectionType::INBOUND;
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810 : : }
811 : :
812 : 1492 : bool ExpectServicesFromConn() const {
813 [ + - + ]: 1492 : switch (m_conn_type) {
814 : : case ConnectionType::INBOUND:
815 : : case ConnectionType::MANUAL:
816 : : case ConnectionType::FEELER:
817 : : return false;
818 : 134 : case ConnectionType::OUTBOUND_FULL_RELAY:
819 : 134 : case ConnectionType::BLOCK_RELAY:
820 : 134 : case ConnectionType::ADDR_FETCH:
821 : 134 : return true;
822 : : } // no default case, so the compiler can warn about missing cases
823 : :
824 : 0 : assert(false);
825 : : }
826 : :
827 : : /**
828 : : * Get network the peer connected through.
829 : : *
830 : : * Returns Network::NET_ONION for *inbound* onion connections,
831 : : * and CNetAddr::GetNetClass() otherwise. The latter cannot be used directly
832 : : * because it doesn't detect the former, and it's not the responsibility of
833 : : * the CNetAddr class to know the actual network a peer is connected through.
834 : : *
835 : : * @return network the peer connected through.
836 : : */
837 : : Network ConnectedThroughNetwork() const;
838 : :
839 : : /** Whether this peer connected through a privacy network. */
840 : : [[nodiscard]] bool IsConnectedThroughPrivacyNet() const;
841 : :
842 : : // We selected peer as (compact blocks) high-bandwidth peer (BIP152)
843 : : std::atomic<bool> m_bip152_highbandwidth_to{false};
844 : : // Peer selected us as (compact blocks) high-bandwidth peer (BIP152)
845 : : std::atomic<bool> m_bip152_highbandwidth_from{false};
846 : :
847 : : /** Whether this peer provides all services that we want. Used for eviction decisions */
848 : : std::atomic_bool m_has_all_wanted_services{false};
849 : :
850 : : /** Whether we should relay transactions to this peer. This only changes
851 : : * from false to true. It will never change back to false. */
852 : : std::atomic_bool m_relays_txs{false};
853 : :
854 : : /** Whether this peer has loaded a bloom filter. Used only in inbound
855 : : * eviction logic. */
856 : : std::atomic_bool m_bloom_filter_loaded{false};
857 : :
858 : : /** UNIX epoch time of the last block received from this peer that we had
859 : : * not yet seen (e.g. not already received from another peer), that passed
860 : : * preliminary validity checks and was saved to disk, even if we don't
861 : : * connect the block or it eventually fails connection. Used as an inbound
862 : : * peer eviction criterium in CConnman::AttemptToEvictConnection. */
863 : : std::atomic<std::chrono::seconds> m_last_block_time{0s};
864 : :
865 : : /** UNIX epoch time of the last transaction received from this peer that we
866 : : * had not yet seen (e.g. not already received from another peer) and that
867 : : * was accepted into our mempool. Used as an inbound peer eviction criterium
868 : : * in CConnman::AttemptToEvictConnection. */
869 : : std::atomic<std::chrono::seconds> m_last_tx_time{0s};
870 : :
871 : : /** Last measured round-trip time. Used only for RPC/GUI stats/debugging.*/
872 : : std::atomic<std::chrono::microseconds> m_last_ping_time{0us};
873 : :
874 : : /** Lowest measured round-trip time. Used as an inbound peer eviction
875 : : * criterium in CConnman::AttemptToEvictConnection. */
876 : : std::atomic<std::chrono::microseconds> m_min_ping_time{std::chrono::microseconds::max()};
877 : :
878 : : CNode(NodeId id,
879 : : std::shared_ptr<Sock> sock,
880 : : const CAddress& addrIn,
881 : : uint64_t nKeyedNetGroupIn,
882 : : uint64_t nLocalHostNonceIn,
883 : : const CAddress& addrBindIn,
884 : : const std::string& addrNameIn,
885 : : ConnectionType conn_type_in,
886 : : bool inbound_onion,
887 : : CNodeOptions&& node_opts = {});
888 : : CNode(const CNode&) = delete;
889 : : CNode& operator=(const CNode&) = delete;
890 : :
891 : 4187073 : NodeId GetId() const {
892 [ + - + - : 3986795 : return id;
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893 : : }
894 : :
895 : 1504 : uint64_t GetLocalNonce() const {
896 [ - + ]: 1504 : return nLocalHostNonce;
897 : : }
898 : :
899 : 816 : int GetRefCount() const
900 : : {
901 [ - + ]: 816 : assert(nRefCount >= 0);
902 : 816 : return nRefCount;
903 : : }
904 : :
905 : : /**
906 : : * Receive bytes from the buffer and deserialize them into messages.
907 : : *
908 : : * @param[in] msg_bytes The raw data
909 : : * @param[out] complete Set True if at least one message has been
910 : : * deserialized and is ready to be processed
911 : : * @return True if the peer should stay connected,
912 : : * False if the peer should be disconnected from.
913 : : */
914 : : bool ReceiveMsgBytes(Span<const uint8_t> msg_bytes, bool& complete) EXCLUSIVE_LOCKS_REQUIRED(!cs_vRecv);
915 : :
916 : 1489 : void SetCommonVersion(int greatest_common_version)
917 : : {
918 : 1489 : Assume(m_greatest_common_version == INIT_PROTO_VERSION);
919 : 1489 : m_greatest_common_version = greatest_common_version;
920 : 1489 : }
921 : 699204 : int GetCommonVersion() const
922 : : {
923 [ + - + - : 699204 : return m_greatest_common_version;
+ - + - +
+ + - + -
+ - ][ + - ]
924 : : }
925 : :
926 : : CService GetAddrLocal() const EXCLUSIVE_LOCKS_REQUIRED(!m_addr_local_mutex);
927 : : //! May not be called more than once
928 : : void SetAddrLocal(const CService& addrLocalIn) EXCLUSIVE_LOCKS_REQUIRED(!m_addr_local_mutex);
929 : :
930 : 1166595 : CNode* AddRef()
931 : : {
932 : 1530 : nRefCount++;
933 : 1166595 : return this;
934 : : }
935 : :
936 : 1165872 : void Release()
937 : : {
938 [ + - ]: 807 : nRefCount--;
939 : : }
940 : :
941 : : void CloseSocketDisconnect() EXCLUSIVE_LOCKS_REQUIRED(!m_sock_mutex);
942 : :
943 : : void CopyStats(CNodeStats& stats) EXCLUSIVE_LOCKS_REQUIRED(!m_subver_mutex, !m_addr_local_mutex, !cs_vSend, !cs_vRecv);
944 : :
945 [ + - + - : 1466 : std::string ConnectionTypeAsString() const { return ::ConnectionTypeAsString(m_conn_type); }
+ - ][ + -
# # # # ]
946 : :
947 : : /** A ping-pong round trip has completed successfully. Update latest and minimum ping times. */
948 : 2384 : void PongReceived(std::chrono::microseconds ping_time) {
949 : 2384 : m_last_ping_time = ping_time;
950 : 2384 : m_min_ping_time = std::min(m_min_ping_time.load(), ping_time);
951 : 2384 : }
952 : :
953 : : private:
954 : : const NodeId id;
955 : : const uint64_t nLocalHostNonce;
956 : : std::atomic<int> m_greatest_common_version{INIT_PROTO_VERSION};
957 : :
958 : : const size_t m_recv_flood_size;
959 : : std::list<CNetMessage> vRecvMsg; // Used only by SocketHandler thread
960 : :
961 : : Mutex m_msg_process_queue_mutex;
962 : : std::list<CNetMessage> m_msg_process_queue GUARDED_BY(m_msg_process_queue_mutex);
963 : : size_t m_msg_process_queue_size GUARDED_BY(m_msg_process_queue_mutex){0};
964 : :
965 : : // Our address, as reported by the peer
966 : : CService m_addr_local GUARDED_BY(m_addr_local_mutex);
967 : : mutable Mutex m_addr_local_mutex;
968 : :
969 : : mapMsgTypeSize mapSendBytesPerMsgType GUARDED_BY(cs_vSend);
970 : : mapMsgTypeSize mapRecvBytesPerMsgType GUARDED_BY(cs_vRecv);
971 : :
972 : : /**
973 : : * If an I2P session is created per connection (for outbound transient I2P
974 : : * connections) then it is stored here so that it can be destroyed when the
975 : : * socket is closed. I2P sessions involve a data/transport socket (in `m_sock`)
976 : : * and a control socket (in `m_i2p_sam_session`). For transient sessions, once
977 : : * the data socket is closed, the control socket is not going to be used anymore
978 : : * and is just taking up resources. So better close it as soon as `m_sock` is
979 : : * closed.
980 : : * Otherwise this unique_ptr is empty.
981 : : */
982 : : std::unique_ptr<i2p::sam::Session> m_i2p_sam_session GUARDED_BY(m_sock_mutex);
983 : : };
984 : :
985 : : /**
986 : : * Interface for message handling
987 : : */
988 : 1060 : class NetEventsInterface
989 : : {
990 : : public:
991 : : /** Mutex for anything that is only accessed via the msg processing thread */
992 : : static Mutex g_msgproc_mutex;
993 : :
994 : : /** Initialize a peer (setup state) */
995 : : virtual void InitializeNode(const CNode& node, ServiceFlags our_services) = 0;
996 : :
997 : : /** Handle removal of a peer (clear state) */
998 : : virtual void FinalizeNode(const CNode& node) = 0;
999 : :
1000 : : /**
1001 : : * Callback to determine whether the given set of service flags are sufficient
1002 : : * for a peer to be "relevant".
1003 : : */
1004 : : virtual bool HasAllDesirableServiceFlags(ServiceFlags services) const = 0;
1005 : :
1006 : : /**
1007 : : * Process protocol messages received from a given node
1008 : : *
1009 : : * @param[in] pnode The node which we have received messages from.
1010 : : * @param[in] interrupt Interrupt condition for processing threads
1011 : : * @return True if there is more work to be done
1012 : : */
1013 : : virtual bool ProcessMessages(CNode* pnode, std::atomic<bool>& interrupt) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex) = 0;
1014 : :
1015 : : /**
1016 : : * Send queued protocol messages to a given node.
1017 : : *
1018 : : * @param[in] pnode The node which we are sending messages to.
1019 : : * @return True if there is more work to be done
1020 : : */
1021 : : virtual bool SendMessages(CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex) = 0;
1022 : :
1023 : :
1024 : : protected:
1025 : : /**
1026 : : * Protected destructor so that instances can only be deleted by derived classes.
1027 : : * If that restriction is no longer desired, this should be made public and virtual.
1028 : : */
1029 : : ~NetEventsInterface() = default;
1030 : : };
1031 : :
1032 : : class CConnman
1033 : : {
1034 : : public:
1035 : :
1036 : : struct Options
1037 : : {
1038 : : ServiceFlags m_local_services = NODE_NONE;
1039 : : int m_max_automatic_connections = 0;
1040 : : CClientUIInterface* uiInterface = nullptr;
1041 : : NetEventsInterface* m_msgproc = nullptr;
1042 : : BanMan* m_banman = nullptr;
1043 : : unsigned int nSendBufferMaxSize = 0;
1044 : : unsigned int nReceiveFloodSize = 0;
1045 : : uint64_t nMaxOutboundLimit = 0;
1046 : : int64_t m_peer_connect_timeout = DEFAULT_PEER_CONNECT_TIMEOUT;
1047 : : std::vector<std::string> vSeedNodes;
1048 : : std::vector<NetWhitelistPermissions> vWhitelistedRangeIncoming;
1049 : : std::vector<NetWhitelistPermissions> vWhitelistedRangeOutgoing;
1050 : : std::vector<NetWhitebindPermissions> vWhiteBinds;
1051 : : std::vector<CService> vBinds;
1052 : : std::vector<CService> onion_binds;
1053 : : /// True if the user did not specify -bind= or -whitebind= and thus
1054 : : /// we should bind on `0.0.0.0` (IPv4) and `::` (IPv6).
1055 : : bool bind_on_any;
1056 : : bool m_use_addrman_outgoing = true;
1057 : : std::vector<std::string> m_specified_outgoing;
1058 : : std::vector<std::string> m_added_nodes;
1059 : : bool m_i2p_accept_incoming;
1060 : : bool whitelist_forcerelay = DEFAULT_WHITELISTFORCERELAY;
1061 : : bool whitelist_relay = DEFAULT_WHITELISTRELAY;
1062 : : };
1063 : :
1064 : 2153 : void Init(const Options& connOptions) EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex, !m_total_bytes_sent_mutex)
1065 : : {
1066 : 2153 : AssertLockNotHeld(m_total_bytes_sent_mutex);
1067 : :
1068 [ + + ]: 2153 : m_local_services = connOptions.m_local_services;
1069 : 2153 : m_max_automatic_connections = connOptions.m_max_automatic_connections;
1070 [ + + ]: 2153 : m_max_outbound_full_relay = std::min(MAX_OUTBOUND_FULL_RELAY_CONNECTIONS, m_max_automatic_connections);
1071 [ + + ]: 2153 : m_max_outbound_block_relay = std::min(MAX_BLOCK_RELAY_ONLY_CONNECTIONS, m_max_automatic_connections - m_max_outbound_full_relay);
1072 : 2153 : m_max_automatic_outbound = m_max_outbound_full_relay + m_max_outbound_block_relay + m_max_feeler;
1073 [ + + ]: 2153 : m_max_inbound = std::max(0, m_max_automatic_connections - m_max_automatic_outbound);
1074 : 2153 : m_use_addrman_outgoing = connOptions.m_use_addrman_outgoing;
1075 : 2153 : m_client_interface = connOptions.uiInterface;
1076 : 2153 : m_banman = connOptions.m_banman;
1077 : 2153 : m_msgproc = connOptions.m_msgproc;
1078 : 2153 : nSendBufferMaxSize = connOptions.nSendBufferMaxSize;
1079 : 2153 : nReceiveFloodSize = connOptions.nReceiveFloodSize;
1080 : 2153 : m_peer_connect_timeout = std::chrono::seconds{connOptions.m_peer_connect_timeout};
1081 : 2153 : {
1082 : 2153 : LOCK(m_total_bytes_sent_mutex);
1083 [ + - ]: 2153 : nMaxOutboundLimit = connOptions.nMaxOutboundLimit;
1084 : 2153 : }
1085 : 2153 : vWhitelistedRangeIncoming = connOptions.vWhitelistedRangeIncoming;
1086 : 2153 : vWhitelistedRangeOutgoing = connOptions.vWhitelistedRangeOutgoing;
1087 : 2153 : {
1088 : 2153 : LOCK(m_added_nodes_mutex);
1089 : : // Attempt v2 connection if we support v2 - we'll reconnect with v1 if our
1090 : : // peer doesn't support it or immediately disconnects us for another reason.
1091 [ + - ]: 2153 : const bool use_v2transport(GetLocalServices() & NODE_P2P_V2);
1092 [ + + ]: 2155 : for (const std::string& added_node : connOptions.m_added_nodes) {
1093 : 2 : m_added_node_params.push_back({added_node, use_v2transport});
1094 : : }
1095 : 2153 : }
1096 : 2153 : m_onion_binds = connOptions.onion_binds;
1097 : 2153 : whitelist_forcerelay = connOptions.whitelist_forcerelay;
1098 : 2153 : whitelist_relay = connOptions.whitelist_relay;
1099 [ + - + - ]: 2155 : }
1100 : :
1101 : : CConnman(uint64_t seed0, uint64_t seed1, AddrMan& addrman, const NetGroupManager& netgroupman,
1102 : : const CChainParams& params, bool network_active = true);
1103 : :
1104 : : ~CConnman();
1105 : :
1106 : : bool Start(CScheduler& scheduler, const Options& options) EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex, !m_added_nodes_mutex, !m_addr_fetches_mutex, !mutexMsgProc);
1107 : :
1108 : : void StopThreads();
1109 : : void StopNodes();
1110 : 2036 : void Stop()
1111 : : {
1112 [ + - ]: 2036 : StopThreads();
1113 [ + - ]: 2036 : StopNodes();
1114 : 933 : };
1115 : :
1116 : : void Interrupt() EXCLUSIVE_LOCKS_REQUIRED(!mutexMsgProc);
1117 [ + - ]: 1065 : bool GetNetworkActive() const { return fNetworkActive; };
[ + + - + ]
1118 [ + + ]: 76 : bool GetUseAddrmanOutgoing() const { return m_use_addrman_outgoing; };
1119 : : void SetNetworkActive(bool active);
1120 : : void OpenNetworkConnection(const CAddress& addrConnect, bool fCountFailure, CSemaphoreGrant&& grant_outbound, const char* strDest, ConnectionType conn_type, bool use_v2transport) EXCLUSIVE_LOCKS_REQUIRED(!m_unused_i2p_sessions_mutex);
1121 : : bool CheckIncomingNonce(uint64_t nonce);
1122 : : void ASMapHealthCheck();
1123 : :
1124 : : // alias for thread safety annotations only, not defined
1125 : : RecursiveMutex& GetNodesMutex() const LOCK_RETURNED(m_nodes_mutex);
1126 : :
1127 : : bool ForNode(NodeId id, std::function<bool(CNode* pnode)> func);
1128 : :
1129 : : void PushMessage(CNode* pnode, CSerializedNetMsg&& msg) EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1130 : :
1131 : : using NodeFn = std::function<void(CNode*)>;
1132 : 87739 : void ForEachNode(const NodeFn& func)
1133 : : {
1134 : 87739 : LOCK(m_nodes_mutex);
1135 [ + + ]: 189236 : for (auto&& node : m_nodes) {
1136 [ + - + + ]: 101497 : if (NodeFullyConnected(node))
1137 [ + - ]: 101489 : func(node);
1138 : : }
1139 : 87739 : };
1140 : :
1141 : : void ForEachNode(const NodeFn& func) const
1142 : : {
1143 : : LOCK(m_nodes_mutex);
1144 : : for (auto&& node : m_nodes) {
1145 : : if (NodeFullyConnected(node))
1146 : : func(node);
1147 : : }
1148 : : };
1149 : :
1150 : : // Addrman functions
1151 : : /**
1152 : : * Return all or many randomly selected addresses, optionally by network.
1153 : : *
1154 : : * @param[in] max_addresses Maximum number of addresses to return (0 = all).
1155 : : * @param[in] max_pct Maximum percentage of addresses to return (0 = all).
1156 : : * @param[in] network Select only addresses of this network (nullopt = all).
1157 : : * @param[in] filtered Select only addresses that are considered high quality (false = all).
1158 : : */
1159 : : std::vector<CAddress> GetAddresses(size_t max_addresses, size_t max_pct, std::optional<Network> network, const bool filtered = true) const;
1160 : : /**
1161 : : * Cache is used to minimize topology leaks, so it should
1162 : : * be used for all non-trusted calls, for example, p2p.
1163 : : * A non-malicious call (from RPC or a peer with addr permission) should
1164 : : * call the function without a parameter to avoid using the cache.
1165 : : */
1166 : : std::vector<CAddress> GetAddresses(CNode& requestor, size_t max_addresses, size_t max_pct);
1167 : :
1168 : : // This allows temporarily exceeding m_max_outbound_full_relay, with the goal of finding
1169 : : // a peer that is better than all our current peers.
1170 : : void SetTryNewOutboundPeer(bool flag);
1171 : : bool GetTryNewOutboundPeer() const;
1172 : :
1173 : : void StartExtraBlockRelayPeers();
1174 : :
1175 : : // Count the number of full-relay peer we have.
1176 : : int GetFullOutboundConnCount() const;
1177 : : // Return the number of outbound peers we have in excess of our target (eg,
1178 : : // if we previously called SetTryNewOutboundPeer(true), and have since set
1179 : : // to false, we may have extra peers that we wish to disconnect). This may
1180 : : // return a value less than (num_outbound_connections - num_outbound_slots)
1181 : : // in cases where some outbound connections are not yet fully connected, or
1182 : : // not yet fully disconnected.
1183 : : int GetExtraFullOutboundCount() const;
1184 : : // Count the number of block-relay-only peers we have over our limit.
1185 : : int GetExtraBlockRelayCount() const;
1186 : :
1187 : : bool AddNode(const AddedNodeParams& add) EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex);
1188 : : bool RemoveAddedNode(const std::string& node) EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex);
1189 : : bool AddedNodesContain(const CAddress& addr) const EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex);
1190 : : std::vector<AddedNodeInfo> GetAddedNodeInfo(bool include_connected) const EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex);
1191 : :
1192 : : /**
1193 : : * Attempts to open a connection. Currently only used from tests.
1194 : : *
1195 : : * @param[in] address Address of node to try connecting to
1196 : : * @param[in] conn_type ConnectionType::OUTBOUND, ConnectionType::BLOCK_RELAY,
1197 : : * ConnectionType::ADDR_FETCH or ConnectionType::FEELER
1198 : : * @param[in] use_v2transport Set to true if node attempts to connect using BIP 324 v2 transport protocol.
1199 : : * @return bool Returns false if there are no available
1200 : : * slots for this connection:
1201 : : * - conn_type not a supported ConnectionType
1202 : : * - Max total outbound connection capacity filled
1203 : : * - Max connection capacity for type is filled
1204 : : */
1205 : : bool AddConnection(const std::string& address, ConnectionType conn_type, bool use_v2transport) EXCLUSIVE_LOCKS_REQUIRED(!m_unused_i2p_sessions_mutex);
1206 : :
1207 : : size_t GetNodeCount(ConnectionDirection) const;
1208 : : std::map<CNetAddr, LocalServiceInfo> getNetLocalAddresses() const;
1209 : : uint32_t GetMappedAS(const CNetAddr& addr) const;
1210 : : void GetNodeStats(std::vector<CNodeStats>& vstats) const;
1211 : : bool DisconnectNode(const std::string& node);
1212 : : bool DisconnectNode(const CSubNet& subnet);
1213 : : bool DisconnectNode(const CNetAddr& addr);
1214 : : bool DisconnectNode(NodeId id);
1215 : :
1216 : : //! Used to convey which local services we are offering peers during node
1217 : : //! connection.
1218 : : //!
1219 : : //! The data returned by this is used in CNode construction,
1220 : : //! which is used to advertise which services we are offering
1221 : : //! that peer during `net_processing.cpp:PushNodeVersion()`.
1222 : : ServiceFlags GetLocalServices() const;
1223 : :
1224 : : //! Updates the local services that this node advertises to other peers
1225 : : //! during connection handshake.
1226 : 11 : void AddLocalServices(ServiceFlags services) { m_local_services = ServiceFlags(m_local_services | services); };
1227 : 7 : void RemoveLocalServices(ServiceFlags services) { m_local_services = ServiceFlags(m_local_services & ~services); }
1228 : :
1229 : : uint64_t GetMaxOutboundTarget() const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1230 : : std::chrono::seconds GetMaxOutboundTimeframe() const;
1231 : :
1232 : : //! check if the outbound target is reached
1233 : : //! if param historicalBlockServingLimit is set true, the function will
1234 : : //! response true if the limit for serving historical blocks has been reached
1235 : : bool OutboundTargetReached(bool historicalBlockServingLimit) const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1236 : :
1237 : : //! response the bytes left in the current max outbound cycle
1238 : : //! in case of no limit, it will always response 0
1239 : : uint64_t GetOutboundTargetBytesLeft() const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1240 : :
1241 : : std::chrono::seconds GetMaxOutboundTimeLeftInCycle() const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1242 : :
1243 : : uint64_t GetTotalBytesRecv() const;
1244 : : uint64_t GetTotalBytesSent() const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1245 : :
1246 : : /** Get a unique deterministic randomizer. */
1247 : : CSipHasher GetDeterministicRandomizer(uint64_t id) const;
1248 : :
1249 : : void WakeMessageHandler() EXCLUSIVE_LOCKS_REQUIRED(!mutexMsgProc);
1250 : :
1251 : : /** Return true if we should disconnect the peer for failing an inactivity check. */
1252 : : bool ShouldRunInactivityChecks(const CNode& node, std::chrono::seconds now) const;
1253 : :
1254 : : bool MultipleManualOrFullOutboundConns(Network net) const EXCLUSIVE_LOCKS_REQUIRED(m_nodes_mutex);
1255 : :
1256 : : private:
1257 [ - + + - ]: 1775 : struct ListenSocket {
1258 : : public:
1259 : : std::shared_ptr<Sock> sock;
1260 [ + - ]: 948 : inline void AddSocketPermissionFlags(NetPermissionFlags& flags) const { NetPermissions::AddFlag(flags, m_permissions); }
1261 : 882 : ListenSocket(std::shared_ptr<Sock> sock_, NetPermissionFlags permissions_)
1262 [ + - + - ]: 1764 : : sock{sock_}, m_permissions{permissions_}
1263 : : {
1264 : : }
1265 : :
1266 : : private:
1267 : : NetPermissionFlags m_permissions;
1268 : : };
1269 : :
1270 : : //! returns the time left in the current max outbound cycle
1271 : : //! in case of no limit, it will always return 0
1272 : : std::chrono::seconds GetMaxOutboundTimeLeftInCycle_() const EXCLUSIVE_LOCKS_REQUIRED(m_total_bytes_sent_mutex);
1273 : :
1274 : : bool BindListenPort(const CService& bindAddr, bilingual_str& strError, NetPermissionFlags permissions);
1275 : : bool Bind(const CService& addr, unsigned int flags, NetPermissionFlags permissions);
1276 : : bool InitBinds(const Options& options);
1277 : :
1278 : : void ThreadOpenAddedConnections() EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex, !m_unused_i2p_sessions_mutex, !m_reconnections_mutex);
1279 : : void AddAddrFetch(const std::string& strDest) EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex);
1280 : : void ProcessAddrFetch() EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex, !m_unused_i2p_sessions_mutex);
1281 : : void ThreadOpenConnections(std::vector<std::string> connect, Span<const std::string> seed_nodes) EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex, !m_added_nodes_mutex, !m_nodes_mutex, !m_unused_i2p_sessions_mutex, !m_reconnections_mutex);
1282 : : void ThreadMessageHandler() EXCLUSIVE_LOCKS_REQUIRED(!mutexMsgProc);
1283 : : void ThreadI2PAcceptIncoming();
1284 : : void AcceptConnection(const ListenSocket& hListenSocket);
1285 : :
1286 : : /**
1287 : : * Create a `CNode` object from a socket that has just been accepted and add the node to
1288 : : * the `m_nodes` member.
1289 : : * @param[in] sock Connected socket to communicate with the peer.
1290 : : * @param[in] permission_flags The peer's permissions.
1291 : : * @param[in] addr_bind The address and port at our side of the connection.
1292 : : * @param[in] addr The address and port at the peer's side of the connection.
1293 : : */
1294 : : void CreateNodeFromAcceptedSocket(std::unique_ptr<Sock>&& sock,
1295 : : NetPermissionFlags permission_flags,
1296 : : const CAddress& addr_bind,
1297 : : const CAddress& addr);
1298 : :
1299 : : void DisconnectNodes() EXCLUSIVE_LOCKS_REQUIRED(!m_reconnections_mutex, !m_nodes_mutex);
1300 : : void NotifyNumConnectionsChanged();
1301 : : /** Return true if the peer is inactive and should be disconnected. */
1302 : : bool InactivityCheck(const CNode& node) const;
1303 : :
1304 : : /**
1305 : : * Generate a collection of sockets to check for IO readiness.
1306 : : * @param[in] nodes Select from these nodes' sockets.
1307 : : * @return sockets to check for readiness
1308 : : */
1309 : : Sock::EventsPerSock GenerateWaitSockets(Span<CNode* const> nodes);
1310 : :
1311 : : /**
1312 : : * Check connected and listening sockets for IO readiness and process them accordingly.
1313 : : */
1314 : : void SocketHandler() EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex, !mutexMsgProc);
1315 : :
1316 : : /**
1317 : : * Do the read/write for connected sockets that are ready for IO.
1318 : : * @param[in] nodes Nodes to process. The socket of each node is checked against `what`.
1319 : : * @param[in] events_per_sock Sockets that are ready for IO.
1320 : : */
1321 : : void SocketHandlerConnected(const std::vector<CNode*>& nodes,
1322 : : const Sock::EventsPerSock& events_per_sock)
1323 : : EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex, !mutexMsgProc);
1324 : :
1325 : : /**
1326 : : * Accept incoming connections, one from each read-ready listening socket.
1327 : : * @param[in] events_per_sock Sockets that are ready for IO.
1328 : : */
1329 : : void SocketHandlerListening(const Sock::EventsPerSock& events_per_sock);
1330 : :
1331 : : void ThreadSocketHandler() EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex, !mutexMsgProc, !m_nodes_mutex, !m_reconnections_mutex);
1332 : : void ThreadDNSAddressSeed() EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex, !m_nodes_mutex);
1333 : :
1334 : : uint64_t CalculateKeyedNetGroup(const CAddress& ad) const;
1335 : :
1336 : : CNode* FindNode(const CNetAddr& ip);
1337 : : CNode* FindNode(const std::string& addrName);
1338 : : CNode* FindNode(const CService& addr);
1339 : :
1340 : : /**
1341 : : * Determine whether we're already connected to a given address, in order to
1342 : : * avoid initiating duplicate connections.
1343 : : */
1344 : : bool AlreadyConnectedToAddress(const CAddress& addr);
1345 : :
1346 : : bool AttemptToEvictConnection();
1347 : : CNode* ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure, ConnectionType conn_type, bool use_v2transport) EXCLUSIVE_LOCKS_REQUIRED(!m_unused_i2p_sessions_mutex);
1348 : : void AddWhitelistPermissionFlags(NetPermissionFlags& flags, const CNetAddr &addr, const std::vector<NetWhitelistPermissions>& ranges) const;
1349 : :
1350 : : void DeleteNode(CNode* pnode);
1351 : :
1352 : : NodeId GetNewNodeId();
1353 : :
1354 : : /** (Try to) send data from node's vSendMsg. Returns (bytes_sent, data_left). */
1355 : : std::pair<size_t, bool> SocketSendData(CNode& node) const EXCLUSIVE_LOCKS_REQUIRED(node.cs_vSend);
1356 : :
1357 : : void DumpAddresses();
1358 : :
1359 : : // Network stats
1360 : : void RecordBytesRecv(uint64_t bytes);
1361 : : void RecordBytesSent(uint64_t bytes) EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1362 : :
1363 : : /**
1364 : : Return reachable networks for which we have no addresses in addrman and therefore
1365 : : may require loading fixed seeds.
1366 : : */
1367 : : std::unordered_set<Network> GetReachableEmptyNetworks() const;
1368 : :
1369 : : /**
1370 : : * Return vector of current BLOCK_RELAY peers.
1371 : : */
1372 : : std::vector<CAddress> GetCurrentBlockRelayOnlyConns() const;
1373 : :
1374 : : /**
1375 : : * Search for a "preferred" network, a reachable network to which we
1376 : : * currently don't have any OUTBOUND_FULL_RELAY or MANUAL connections.
1377 : : * There needs to be at least one address in AddrMan for a preferred
1378 : : * network to be picked.
1379 : : *
1380 : : * @param[out] network Preferred network, if found.
1381 : : *
1382 : : * @return bool Whether a preferred network was found.
1383 : : */
1384 : : bool MaybePickPreferredNetwork(std::optional<Network>& network);
1385 : :
1386 : : // Whether the node should be passed out in ForEach* callbacks
1387 : : static bool NodeFullyConnected(const CNode* pnode);
1388 : :
1389 : : uint16_t GetDefaultPort(Network net) const;
1390 : : uint16_t GetDefaultPort(const std::string& addr) const;
1391 : :
1392 : : // Network usage totals
1393 : : mutable Mutex m_total_bytes_sent_mutex;
1394 : : std::atomic<uint64_t> nTotalBytesRecv{0};
1395 : : uint64_t nTotalBytesSent GUARDED_BY(m_total_bytes_sent_mutex) {0};
1396 : :
1397 : : // outbound limit & stats
1398 : : uint64_t nMaxOutboundTotalBytesSentInCycle GUARDED_BY(m_total_bytes_sent_mutex) {0};
1399 : : std::chrono::seconds nMaxOutboundCycleStartTime GUARDED_BY(m_total_bytes_sent_mutex) {0};
1400 : : uint64_t nMaxOutboundLimit GUARDED_BY(m_total_bytes_sent_mutex);
1401 : :
1402 : : // P2P timeout in seconds
1403 : : std::chrono::seconds m_peer_connect_timeout;
1404 : :
1405 : : // Whitelisted ranges. Any node connecting from these is automatically
1406 : : // whitelisted (as well as those connecting to whitelisted binds).
1407 : : std::vector<NetWhitelistPermissions> vWhitelistedRangeIncoming;
1408 : : // Whitelisted ranges for outgoing connections.
1409 : : std::vector<NetWhitelistPermissions> vWhitelistedRangeOutgoing;
1410 : :
1411 : : unsigned int nSendBufferMaxSize{0};
1412 : : unsigned int nReceiveFloodSize{0};
1413 : :
1414 : : std::vector<ListenSocket> vhListenSocket;
1415 : : std::atomic<bool> fNetworkActive{true};
1416 : : bool fAddressesInitialized{false};
1417 : : AddrMan& addrman;
1418 : : const NetGroupManager& m_netgroupman;
1419 : : std::deque<std::string> m_addr_fetches GUARDED_BY(m_addr_fetches_mutex);
1420 : : Mutex m_addr_fetches_mutex;
1421 : :
1422 : : // connection string and whether to use v2 p2p
1423 : : std::vector<AddedNodeParams> m_added_node_params GUARDED_BY(m_added_nodes_mutex);
1424 : :
1425 : : mutable Mutex m_added_nodes_mutex;
1426 : : std::vector<CNode*> m_nodes GUARDED_BY(m_nodes_mutex);
1427 : : std::list<CNode*> m_nodes_disconnected;
1428 : : mutable RecursiveMutex m_nodes_mutex;
1429 : : std::atomic<NodeId> nLastNodeId{0};
1430 : : unsigned int nPrevNodeCount{0};
1431 : :
1432 : : // Stores number of full-tx connections (outbound and manual) per network
1433 : : std::array<unsigned int, Network::NET_MAX> m_network_conn_counts GUARDED_BY(m_nodes_mutex) = {};
1434 : :
1435 : : /**
1436 : : * Cache responses to addr requests to minimize privacy leak.
1437 : : * Attack example: scraping addrs in real-time may allow an attacker
1438 : : * to infer new connections of the victim by detecting new records
1439 : : * with fresh timestamps (per self-announcement).
1440 : : */
1441 [ + + ]: 1233 : struct CachedAddrResponse {
1442 : : std::vector<CAddress> m_addrs_response_cache;
1443 : : std::chrono::microseconds m_cache_entry_expiration{0};
1444 : : };
1445 : :
1446 : : /**
1447 : : * Addr responses stored in different caches
1448 : : * per (network, local socket) prevent cross-network node identification.
1449 : : * If a node for example is multi-homed under Tor and IPv6,
1450 : : * a single cache (or no cache at all) would let an attacker
1451 : : * to easily detect that it is the same node by comparing responses.
1452 : : * Indexing by local socket prevents leakage when a node has multiple
1453 : : * listening addresses on the same network.
1454 : : *
1455 : : * The used memory equals to 1000 CAddress records (or around 40 bytes) per
1456 : : * distinct Network (up to 5) we have/had an inbound peer from,
1457 : : * resulting in at most ~196 KB. Every separate local socket may
1458 : : * add up to ~196 KB extra.
1459 : : */
1460 : : std::map<uint64_t, CachedAddrResponse> m_addr_response_caches;
1461 : :
1462 : : /**
1463 : : * Services this node offers.
1464 : : *
1465 : : * This data is replicated in each Peer instance we create.
1466 : : *
1467 : : * This data is not marked const, but after being set it should not
1468 : : * change. Unless AssumeUTXO is started, in which case, the peer
1469 : : * will be limited until the background chain sync finishes.
1470 : : *
1471 : : * \sa Peer::our_services
1472 : : */
1473 : : std::atomic<ServiceFlags> m_local_services;
1474 : :
1475 : : std::unique_ptr<CSemaphore> semOutbound;
1476 : : std::unique_ptr<CSemaphore> semAddnode;
1477 : :
1478 : : /**
1479 : : * Maximum number of automatic connections permitted, excluding manual
1480 : : * connections but including inbounds. May be changed by the user and is
1481 : : * potentially limited by the operating system (number of file descriptors).
1482 : : */
1483 : : int m_max_automatic_connections;
1484 : :
1485 : : /*
1486 : : * Maximum number of peers by connection type. Might vary from defaults
1487 : : * based on -maxconnections init value.
1488 : : */
1489 : :
1490 : : // How many full-relay (tx, block, addr) outbound peers we want
1491 : : int m_max_outbound_full_relay;
1492 : :
1493 : : // How many block-relay only outbound peers we want
1494 : : // We do not relay tx or addr messages with these peers
1495 : : int m_max_outbound_block_relay;
1496 : :
1497 : : int m_max_addnode{MAX_ADDNODE_CONNECTIONS};
1498 : : int m_max_feeler{MAX_FEELER_CONNECTIONS};
1499 : : int m_max_automatic_outbound;
1500 : : int m_max_inbound;
1501 : :
1502 : : bool m_use_addrman_outgoing;
1503 : : CClientUIInterface* m_client_interface;
1504 : : NetEventsInterface* m_msgproc;
1505 : : /** Pointer to this node's banman. May be nullptr - check existence before dereferencing. */
1506 : : BanMan* m_banman;
1507 : :
1508 : : /**
1509 : : * Addresses that were saved during the previous clean shutdown. We'll
1510 : : * attempt to make block-relay-only connections to them.
1511 : : */
1512 : : std::vector<CAddress> m_anchors;
1513 : :
1514 : : /** SipHasher seeds for deterministic randomness */
1515 : : const uint64_t nSeed0, nSeed1;
1516 : :
1517 : : /** flag for waking the message processor. */
1518 : : bool fMsgProcWake GUARDED_BY(mutexMsgProc);
1519 : :
1520 : : std::condition_variable condMsgProc;
1521 : : Mutex mutexMsgProc;
1522 : : std::atomic<bool> flagInterruptMsgProc{false};
1523 : :
1524 : : /**
1525 : : * This is signaled when network activity should cease.
1526 : : * A pointer to it is saved in `m_i2p_sam_session`, so make sure that
1527 : : * the lifetime of `interruptNet` is not shorter than
1528 : : * the lifetime of `m_i2p_sam_session`.
1529 : : */
1530 : : CThreadInterrupt interruptNet;
1531 : :
1532 : : /**
1533 : : * I2P SAM session.
1534 : : * Used to accept incoming and make outgoing I2P connections from a persistent
1535 : : * address.
1536 : : */
1537 : : std::unique_ptr<i2p::sam::Session> m_i2p_sam_session;
1538 : :
1539 : : std::thread threadDNSAddressSeed;
1540 : : std::thread threadSocketHandler;
1541 : : std::thread threadOpenAddedConnections;
1542 : : std::thread threadOpenConnections;
1543 : : std::thread threadMessageHandler;
1544 : : std::thread threadI2PAcceptIncoming;
1545 : :
1546 : : /** flag for deciding to connect to an extra outbound peer,
1547 : : * in excess of m_max_outbound_full_relay
1548 : : * This takes the place of a feeler connection */
1549 : : std::atomic_bool m_try_another_outbound_peer;
1550 : :
1551 : : /** flag for initiating extra block-relay-only peer connections.
1552 : : * this should only be enabled after initial chain sync has occurred,
1553 : : * as these connections are intended to be short-lived and low-bandwidth.
1554 : : */
1555 : : std::atomic_bool m_start_extra_block_relay_peers{false};
1556 : :
1557 : : /**
1558 : : * A vector of -bind=<address>:<port>=onion arguments each of which is
1559 : : * an address and port that are designated for incoming Tor connections.
1560 : : */
1561 : : std::vector<CService> m_onion_binds;
1562 : :
1563 : : /**
1564 : : * flag for adding 'forcerelay' permission to whitelisted inbound
1565 : : * and manual peers with default permissions.
1566 : : */
1567 : : bool whitelist_forcerelay;
1568 : :
1569 : : /**
1570 : : * flag for adding 'relay' permission to whitelisted inbound
1571 : : * and manual peers with default permissions.
1572 : : */
1573 : : bool whitelist_relay;
1574 : :
1575 : : /**
1576 : : * Mutex protecting m_i2p_sam_sessions.
1577 : : */
1578 : : Mutex m_unused_i2p_sessions_mutex;
1579 : :
1580 : : /**
1581 : : * A pool of created I2P SAM transient sessions that should be used instead
1582 : : * of creating new ones in order to reduce the load on the I2P network.
1583 : : * Creating a session in I2P is not cheap, thus if this is not empty, then
1584 : : * pick an entry from it instead of creating a new session. If connecting to
1585 : : * a host fails, then the created session is put to this pool for reuse.
1586 : : */
1587 : : std::queue<std::unique_ptr<i2p::sam::Session>> m_unused_i2p_sessions GUARDED_BY(m_unused_i2p_sessions_mutex);
1588 : :
1589 : : /**
1590 : : * Mutex protecting m_reconnections.
1591 : : */
1592 : : Mutex m_reconnections_mutex;
1593 : :
1594 : : /** Struct for entries in m_reconnections. */
1595 : : struct ReconnectionInfo
1596 : : {
1597 : : CAddress addr_connect;
1598 : : CSemaphoreGrant grant;
1599 : : std::string destination;
1600 : : ConnectionType conn_type;
1601 : : bool use_v2transport;
1602 : : };
1603 : :
1604 : : /**
1605 : : * List of reconnections we have to make.
1606 : : */
1607 : : std::list<ReconnectionInfo> m_reconnections GUARDED_BY(m_reconnections_mutex);
1608 : :
1609 : : /** Attempt reconnections, if m_reconnections non-empty. */
1610 : : void PerformReconnections() EXCLUSIVE_LOCKS_REQUIRED(!m_reconnections_mutex, !m_unused_i2p_sessions_mutex);
1611 : :
1612 : : /**
1613 : : * Cap on the size of `m_unused_i2p_sessions`, to ensure it does not
1614 : : * unexpectedly use too much memory.
1615 : : */
1616 : : static constexpr size_t MAX_UNUSED_I2P_SESSIONS_SIZE{10};
1617 : :
1618 : : /**
1619 : : * RAII helper to atomically create a copy of `m_nodes` and add a reference
1620 : : * to each of the nodes. The nodes are released when this object is destroyed.
1621 : : */
1622 : : class NodesSnapshot
1623 : : {
1624 : : public:
1625 : 801010 : explicit NodesSnapshot(const CConnman& connman, bool shuffle)
1626 [ + - ]: 801010 : {
1627 : 801010 : {
1628 [ + - ]: 801010 : LOCK(connman.m_nodes_mutex);
1629 [ + - ]: 801010 : m_nodes_copy = connman.m_nodes;
1630 [ + + ]: 1966075 : for (auto& node : m_nodes_copy) {
1631 : 1165065 : node->AddRef();
1632 : : }
1633 : 0 : }
1634 [ + + ]: 801010 : if (shuffle) {
1635 : 302895 : std::shuffle(m_nodes_copy.begin(), m_nodes_copy.end(), FastRandomContext{});
1636 : : }
1637 : 801010 : }
1638 : :
1639 : 801010 : ~NodesSnapshot()
1640 : : {
1641 [ + + ]: 1966075 : for (auto& node : m_nodes_copy) {
1642 : 1165065 : node->Release();
1643 : : }
1644 : 801010 : }
1645 : :
1646 : 498115 : const std::vector<CNode*>& Nodes() const
1647 : : {
1648 [ + - ]: 498115 : return m_nodes_copy;
1649 : : }
1650 : :
1651 : : private:
1652 : : std::vector<CNode*> m_nodes_copy;
1653 : : };
1654 : :
1655 : : const CChainParams& m_params;
1656 : :
1657 : : friend struct ConnmanTestMsg;
1658 : : };
1659 : :
1660 : : /** Defaults to `CaptureMessageToFile()`, but can be overridden by unit tests. */
1661 : : extern std::function<void(const CAddress& addr,
1662 : : const std::string& msg_type,
1663 : : Span<const unsigned char> data,
1664 : : bool is_incoming)>
1665 : : CaptureMessage;
1666 : :
1667 : : #endif // BITCOIN_NET_H
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