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1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-present The Bitcoin Core developers
3 : : // Distributed under the MIT software license, see the accompanying
4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 : :
6 : : #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 <semaphore_grant.h>
28 : : #include <span.h>
29 : : #include <streams.h>
30 : : #include <sync.h>
31 : : #include <uint256.h>
32 : : #include <util/check.h>
33 : : #include <util/sock.h>
34 : : #include <util/threadinterrupt.h>
35 : :
36 : : #include <atomic>
37 : : #include <condition_variable>
38 : : #include <cstdint>
39 : : #include <deque>
40 : : #include <functional>
41 : : #include <list>
42 : : #include <map>
43 : : #include <memory>
44 : : #include <optional>
45 : : #include <queue>
46 : : #include <string_view>
47 : : #include <thread>
48 : : #include <unordered_set>
49 : : #include <vector>
50 : :
51 : : class AddrMan;
52 : : class BanMan;
53 : : class CChainParams;
54 : : class CNode;
55 : : class CScheduler;
56 : : struct bilingual_str;
57 : :
58 : : /** Time after which to disconnect, after waiting for a ping response (or inactivity). */
59 : : static constexpr std::chrono::minutes TIMEOUT_INTERVAL{20};
60 : : /** Run the feeler connection loop once every 2 minutes. **/
61 : : static constexpr auto FEELER_INTERVAL = 2min;
62 : : /** Run the extra block-relay-only connection loop once every 5 minutes. **/
63 : : static constexpr auto EXTRA_BLOCK_RELAY_ONLY_PEER_INTERVAL = 5min;
64 : : /** Maximum length of incoming protocol messages (no message over 4 MB is currently acceptable). */
65 : : static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 4 * 1000 * 1000;
66 : : /** Maximum length of the user agent string in `version` message */
67 : : static const unsigned int MAX_SUBVERSION_LENGTH = 256;
68 : : /** Maximum number of automatic outgoing nodes over which we'll relay everything (blocks, tx, addrs, etc) */
69 : : static const int MAX_OUTBOUND_FULL_RELAY_CONNECTIONS = 8;
70 : : /** Maximum number of addnode outgoing nodes */
71 : : static const int MAX_ADDNODE_CONNECTIONS = 8;
72 : : /** Maximum number of block-relay-only outgoing connections */
73 : : static const int MAX_BLOCK_RELAY_ONLY_CONNECTIONS = 2;
74 : : /** Maximum number of feeler connections */
75 : : static const int MAX_FEELER_CONNECTIONS = 1;
76 : : /** -listen default */
77 : : static const bool DEFAULT_LISTEN = true;
78 : : /** The maximum number of peer connections to maintain. */
79 : : static const unsigned int DEFAULT_MAX_PEER_CONNECTIONS = 125;
80 : : /** The default for -maxuploadtarget. 0 = Unlimited */
81 : : static const std::string DEFAULT_MAX_UPLOAD_TARGET{"0M"};
82 : : /** Default for blocks only*/
83 : : static const bool DEFAULT_BLOCKSONLY = false;
84 : : /** -peertimeout default */
85 : : static const int64_t DEFAULT_PEER_CONNECT_TIMEOUT = 60;
86 : : /** Number of file descriptors required for message capture **/
87 : : static const int NUM_FDS_MESSAGE_CAPTURE = 1;
88 : : /** Interval for ASMap Health Check **/
89 : : static constexpr std::chrono::hours ASMAP_HEALTH_CHECK_INTERVAL{24};
90 : :
91 : : static constexpr bool DEFAULT_FORCEDNSSEED{false};
92 : : static constexpr bool DEFAULT_DNSSEED{true};
93 : : static constexpr bool DEFAULT_FIXEDSEEDS{true};
94 : : static const size_t DEFAULT_MAXRECEIVEBUFFER = 5 * 1000;
95 : : static const size_t DEFAULT_MAXSENDBUFFER = 1 * 1000;
96 : :
97 : : static constexpr bool DEFAULT_V2_TRANSPORT{true};
98 : :
99 : : typedef int64_t NodeId;
100 : :
101 [ + - + - : 34 : struct AddedNodeParams {
+ - ][ # # ]
102 : : std::string m_added_node;
103 : : bool m_use_v2transport;
104 : : };
105 : :
106 : 25 : struct AddedNodeInfo {
107 : : AddedNodeParams m_params;
108 : : CService resolvedAddress;
109 : : bool fConnected;
110 : : bool fInbound;
111 : : };
112 : :
113 : : class CNodeStats;
114 : : class CClientUIInterface;
115 : :
116 : 149 : struct CSerializedNetMsg {
117 [ # # ]: 192 : CSerializedNetMsg() = default;
118 : 73 : CSerializedNetMsg(CSerializedNetMsg&&) = default;
119 : 8 : CSerializedNetMsg& operator=(CSerializedNetMsg&&) = default;
120 : : // No implicit copying, only moves.
121 : : CSerializedNetMsg(const CSerializedNetMsg& msg) = delete;
122 : : CSerializedNetMsg& operator=(const CSerializedNetMsg&) = delete;
123 : :
124 : 0 : CSerializedNetMsg Copy() const
125 : : {
126 [ # # ]: 0 : CSerializedNetMsg copy;
127 [ # # ]: 0 : copy.data = data;
128 [ # # ]: 0 : copy.m_type = m_type;
129 : 0 : return copy;
130 : 0 : }
131 : :
132 : : std::vector<unsigned char> data;
133 : : std::string m_type;
134 : :
135 : : /** Compute total memory usage of this object (own memory + any dynamic memory). */
136 : : size_t GetMemoryUsage() const noexcept;
137 : : };
138 : :
139 : : /**
140 : : * Look up IP addresses from all interfaces on the machine and add them to the
141 : : * list of local addresses to self-advertise.
142 : : * The loopback interface is skipped.
143 : : */
144 : : void Discover();
145 : :
146 : : uint16_t GetListenPort();
147 : :
148 : : enum
149 : : {
150 : : LOCAL_NONE, // unknown
151 : : LOCAL_IF, // address a local interface listens on
152 : : LOCAL_BIND, // address explicit bound to
153 : : LOCAL_MAPPED, // address reported by PCP
154 : : LOCAL_MANUAL, // address explicitly specified (-externalip=)
155 : :
156 : : LOCAL_MAX
157 : : };
158 : :
159 : : /** Returns a local address that we should advertise to this peer. */
160 : : std::optional<CService> GetLocalAddrForPeer(CNode& node);
161 : :
162 : : void ClearLocal();
163 : : bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
164 : : bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
165 : : void RemoveLocal(const CService& addr);
166 : : bool SeenLocal(const CService& addr);
167 : : bool IsLocal(const CService& addr);
168 : : CService GetLocalAddress(const CNode& peer);
169 : :
170 : : extern bool fDiscover;
171 : : extern bool fListen;
172 : :
173 : : /** Subversion as sent to the P2P network in `version` messages */
174 : : extern std::string strSubVersion;
175 : :
176 : : struct LocalServiceInfo {
177 : : int nScore;
178 : : uint16_t nPort;
179 : : };
180 : :
181 : : extern GlobalMutex g_maplocalhost_mutex;
182 : : extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost GUARDED_BY(g_maplocalhost_mutex);
183 : :
184 : : extern const std::string NET_MESSAGE_TYPE_OTHER;
185 : : using mapMsgTypeSize = std::map</* message type */ std::string, /* total bytes */ uint64_t>;
186 : :
187 : : class CNodeStats
188 : : {
189 : : public:
190 : : NodeId nodeid;
191 : : std::chrono::seconds m_last_send;
192 : : std::chrono::seconds m_last_recv;
193 : : std::chrono::seconds m_last_tx_time;
194 : : std::chrono::seconds m_last_block_time;
195 : : std::chrono::seconds m_connected;
196 : : std::string m_addr_name;
197 : : int nVersion;
198 : : std::string cleanSubVer;
199 : : bool fInbound;
200 : : // We requested high bandwidth connection to peer
201 : : bool m_bip152_highbandwidth_to;
202 : : // Peer requested high bandwidth connection
203 : : bool m_bip152_highbandwidth_from;
204 : : int m_starting_height;
205 : : uint64_t nSendBytes;
206 : : mapMsgTypeSize mapSendBytesPerMsgType;
207 : : uint64_t nRecvBytes;
208 : : mapMsgTypeSize mapRecvBytesPerMsgType;
209 : : NetPermissionFlags m_permission_flags;
210 : : std::chrono::microseconds m_last_ping_time;
211 : : std::chrono::microseconds m_min_ping_time;
212 : : // Our address, as reported by the peer
213 : : std::string addrLocal;
214 : : // Address of this peer
215 : : CAddress addr;
216 : : // Bind address of our side of the connection
217 : : CService addrBind;
218 : : // Network the peer connected through
219 : : Network m_network;
220 : : uint32_t m_mapped_as;
221 : : ConnectionType m_conn_type;
222 : : /** Transport protocol type. */
223 : : TransportProtocolType m_transport_type;
224 : : /** BIP324 session id string in hex, if any. */
225 : : std::string m_session_id;
226 : : };
227 : :
228 : :
229 : : /** Transport protocol agnostic message container.
230 : : * Ideally it should only contain receive time, payload,
231 : : * type and size.
232 : : */
233 : 883 : class CNetMessage
234 : : {
235 : : public:
236 : : DataStream m_recv; //!< received message data
237 : : std::chrono::microseconds m_time{0}; //!< time of message receipt
238 : : uint32_t m_message_size{0}; //!< size of the payload
239 : : uint32_t m_raw_message_size{0}; //!< used wire size of the message (including header/checksum)
240 : : std::string m_type;
241 : :
242 [ + - ]: 254 : explicit CNetMessage(DataStream&& recv_in) : m_recv(std::move(recv_in)) {}
243 : : // Only one CNetMessage object will exist for the same message on either
244 : : // the receive or processing queue. For performance reasons we therefore
245 : : // delete the copy constructor and assignment operator to avoid the
246 : : // possibility of copying CNetMessage objects.
247 : 629 : CNetMessage(CNetMessage&&) = default;
248 : : CNetMessage(const CNetMessage&) = delete;
249 : : CNetMessage& operator=(CNetMessage&&) = default;
250 : : CNetMessage& operator=(const CNetMessage&) = delete;
251 : :
252 : : /** Compute total memory usage of this object (own memory + any dynamic memory). */
253 : : size_t GetMemoryUsage() const noexcept;
254 : : };
255 : :
256 : : /** The Transport converts one connection's sent messages to wire bytes, and received bytes back. */
257 : 190 : class Transport {
258 : : public:
259 : : virtual ~Transport() = default;
260 : :
261 [ + - ]: 71 : struct Info
262 : : {
263 : : TransportProtocolType transport_type;
264 : : std::optional<uint256> session_id;
265 : : };
266 : :
267 : : /** Retrieve information about this transport. */
268 : : virtual Info GetInfo() const noexcept = 0;
269 : :
270 : : // 1. Receiver side functions, for decoding bytes received on the wire into transport protocol
271 : : // agnostic CNetMessage (message type & payload) objects.
272 : :
273 : : /** Returns true if the current message is complete (so GetReceivedMessage can be called). */
274 : : virtual bool ReceivedMessageComplete() const = 0;
275 : :
276 : : /** Feed wire bytes to the transport.
277 : : *
278 : : * @return false if some bytes were invalid, in which case the transport can't be used anymore.
279 : : *
280 : : * Consumed bytes are chopped off the front of msg_bytes.
281 : : */
282 : : virtual bool ReceivedBytes(std::span<const uint8_t>& msg_bytes) = 0;
283 : :
284 : : /** Retrieve a completed message from transport.
285 : : *
286 : : * This can only be called when ReceivedMessageComplete() is true.
287 : : *
288 : : * If reject_message=true is returned the message itself is invalid, but (other than false
289 : : * returned by ReceivedBytes) the transport is not in an inconsistent state.
290 : : */
291 : : virtual CNetMessage GetReceivedMessage(std::chrono::microseconds time, bool& reject_message) = 0;
292 : :
293 : : // 2. Sending side functions, for converting messages into bytes to be sent over the wire.
294 : :
295 : : /** Set the next message to send.
296 : : *
297 : : * If no message can currently be set (perhaps because the previous one is not yet done being
298 : : * sent), returns false, and msg will be unmodified. Otherwise msg is enqueued (and
299 : : * possibly moved-from) and true is returned.
300 : : */
301 : : virtual bool SetMessageToSend(CSerializedNetMsg& msg) noexcept = 0;
302 : :
303 : : /** Return type for GetBytesToSend, consisting of:
304 : : * - std::span<const uint8_t> to_send: span of bytes to be sent over the wire (possibly empty).
305 : : * - bool more: whether there will be more bytes to be sent after the ones in to_send are
306 : : * all sent (as signaled by MarkBytesSent()).
307 : : * - const std::string& m_type: message type on behalf of which this is being sent
308 : : * ("" for bytes that are not on behalf of any message).
309 : : */
310 : : using BytesToSend = std::tuple<
311 : : std::span<const uint8_t> /*to_send*/,
312 : : bool /*more*/,
313 : : const std::string& /*m_type*/
314 : : >;
315 : :
316 : : /** Get bytes to send on the wire, if any, along with other information about it.
317 : : *
318 : : * As a const function, it does not modify the transport's observable state, and is thus safe
319 : : * to be called multiple times.
320 : : *
321 : : * @param[in] have_next_message If true, the "more" return value reports whether more will
322 : : * be sendable after a SetMessageToSend call. It is set by the caller when they know
323 : : * they have another message ready to send, and only care about what happens
324 : : * after that. The have_next_message argument only affects this "more" return value
325 : : * and nothing else.
326 : : *
327 : : * Effectively, there are three possible outcomes about whether there are more bytes
328 : : * to send:
329 : : * - Yes: the transport itself has more bytes to send later. For example, for
330 : : * V1Transport this happens during the sending of the header of a
331 : : * message, when there is a non-empty payload that follows.
332 : : * - No: the transport itself has no more bytes to send, but will have bytes to
333 : : * send if handed a message through SetMessageToSend. In V1Transport this
334 : : * happens when sending the payload of a message.
335 : : * - Blocked: the transport itself has no more bytes to send, and is also incapable
336 : : * of sending anything more at all now, if it were handed another
337 : : * message to send. This occurs in V2Transport before the handshake is
338 : : * complete, as the encryption ciphers are not set up for sending
339 : : * messages before that point.
340 : : *
341 : : * The boolean 'more' is true for Yes, false for Blocked, and have_next_message
342 : : * controls what is returned for No.
343 : : *
344 : : * @return a BytesToSend object. The to_send member returned acts as a stream which is only
345 : : * ever appended to. This means that with the exception of MarkBytesSent (which pops
346 : : * bytes off the front of later to_sends), operations on the transport can only append
347 : : * to what is being returned. Also note that m_type and to_send refer to data that is
348 : : * internal to the transport, and calling any non-const function on this object may
349 : : * invalidate them.
350 : : */
351 : : virtual BytesToSend GetBytesToSend(bool have_next_message) const noexcept = 0;
352 : :
353 : : /** Report how many bytes returned by the last GetBytesToSend() have been sent.
354 : : *
355 : : * bytes_sent cannot exceed to_send.size() of the last GetBytesToSend() result.
356 : : *
357 : : * If bytes_sent=0, this call has no effect.
358 : : */
359 : : virtual void MarkBytesSent(size_t bytes_sent) noexcept = 0;
360 : :
361 : : /** Return the memory usage of this transport attributable to buffered data to send. */
362 : : virtual size_t GetSendMemoryUsage() const noexcept = 0;
363 : :
364 : : // 3. Miscellaneous functions.
365 : :
366 : : /** Whether upon disconnections, a reconnect with V1 is warranted. */
367 : : virtual bool ShouldReconnectV1() const noexcept = 0;
368 : : };
369 : :
370 : : class V1Transport final : public Transport
371 : : {
372 : : private:
373 : : const MessageStartChars m_magic_bytes;
374 : : const NodeId m_node_id; // Only for logging
375 : : mutable Mutex m_recv_mutex; //!< Lock for receive state
376 : : mutable CHash256 hasher GUARDED_BY(m_recv_mutex);
377 : : mutable uint256 data_hash GUARDED_BY(m_recv_mutex);
378 : : bool in_data GUARDED_BY(m_recv_mutex); // parsing header (false) or data (true)
379 : : DataStream hdrbuf GUARDED_BY(m_recv_mutex){}; // partially received header
380 : : CMessageHeader hdr GUARDED_BY(m_recv_mutex); // complete header
381 : : DataStream vRecv GUARDED_BY(m_recv_mutex){}; // received message data
382 : : unsigned int nHdrPos GUARDED_BY(m_recv_mutex);
383 : : unsigned int nDataPos GUARDED_BY(m_recv_mutex);
384 : :
385 : : const uint256& GetMessageHash() const EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
386 : : int readHeader(std::span<const uint8_t> msg_bytes) EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
387 : : int readData(std::span<const uint8_t> msg_bytes) EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
388 : :
389 : 117 : void Reset() EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex) {
390 : 117 : AssertLockHeld(m_recv_mutex);
391 [ - + ]: 117 : vRecv.clear();
392 [ - + ]: 117 : hdrbuf.clear();
393 : 117 : hdrbuf.resize(24);
394 : 117 : in_data = false;
395 : 117 : nHdrPos = 0;
396 : 117 : nDataPos = 0;
397 : 117 : data_hash.SetNull();
398 : 117 : hasher.Reset();
399 : 117 : }
400 : :
401 : 9 : bool CompleteInternal() const noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex)
402 : : {
403 : 9 : AssertLockHeld(m_recv_mutex);
404 [ + - ]: 9 : if (!in_data) return false;
405 [ - + ]: 7 : return hdr.nMessageSize == nDataPos;
406 : : }
407 : :
408 : : /** Lock for sending state. */
409 : : mutable Mutex m_send_mutex;
410 : : /** The header of the message currently being sent. */
411 : : std::vector<uint8_t> m_header_to_send GUARDED_BY(m_send_mutex);
412 : : /** The data of the message currently being sent. */
413 : : CSerializedNetMsg m_message_to_send GUARDED_BY(m_send_mutex);
414 : : /** Whether we're currently sending header bytes or message bytes. */
415 : : bool m_sending_header GUARDED_BY(m_send_mutex) {false};
416 : : /** How many bytes have been sent so far (from m_header_to_send, or from m_message_to_send.data). */
417 : : size_t m_bytes_sent GUARDED_BY(m_send_mutex) {0};
418 : :
419 : : public:
420 : : explicit V1Transport(const NodeId node_id) noexcept;
421 : :
422 : 7 : bool ReceivedMessageComplete() const override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex)
423 : : {
424 : 7 : AssertLockNotHeld(m_recv_mutex);
425 [ - - + + : 19 : return WITH_LOCK(m_recv_mutex, return CompleteInternal());
+ - ]
[ - - - - ]
426 : : }
427 : :
428 : : Info GetInfo() const noexcept override;
429 : :
430 : 6 : bool ReceivedBytes(std::span<const uint8_t>& msg_bytes) override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex)
431 : : {
432 : 6 : AssertLockNotHeld(m_recv_mutex);
433 : 6 : LOCK(m_recv_mutex);
434 [ + + + - : 6 : int ret = in_data ? readData(msg_bytes) : readHeader(msg_bytes);
+ - ]
435 [ - + ]: 6 : if (ret < 0) {
436 [ # # ]: 0 : Reset();
437 : : } else {
438 : 6 : msg_bytes = msg_bytes.subspan(ret);
439 : : }
440 [ + - ]: 6 : return ret >= 0;
441 : 6 : }
442 : :
443 : : CNetMessage GetReceivedMessage(std::chrono::microseconds time, bool& reject_message) override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex);
444 : :
445 : : bool SetMessageToSend(CSerializedNetMsg& msg) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
446 : : BytesToSend GetBytesToSend(bool have_next_message) const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
447 : : void MarkBytesSent(size_t bytes_sent) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
448 : : size_t GetSendMemoryUsage() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
449 : 0 : bool ShouldReconnectV1() const noexcept override { return false; }
450 : : };
451 : :
452 : : class V2Transport final : public Transport
453 : : {
454 : : private:
455 : : /** Contents of the version packet to send. BIP324 stipulates that senders should leave this
456 : : * empty, and receivers should ignore it. Future extensions can change what is sent as long as
457 : : * an empty version packet contents is interpreted as no extensions supported. */
458 : : static constexpr std::array<std::byte, 0> VERSION_CONTENTS = {};
459 : :
460 : : /** The length of the V1 prefix to match bytes initially received by responders with to
461 : : * determine if their peer is speaking V1 or V2. */
462 : : static constexpr size_t V1_PREFIX_LEN = 16;
463 : :
464 : : // The sender side and receiver side of V2Transport are state machines that are transitioned
465 : : // through, based on what has been received. The receive state corresponds to the contents of,
466 : : // and bytes received to, the receive buffer. The send state controls what can be appended to
467 : : // the send buffer and what can be sent from it.
468 : :
469 : : /** State type that defines the current contents of the receive buffer and/or how the next
470 : : * received bytes added to it will be interpreted.
471 : : *
472 : : * Diagram:
473 : : *
474 : : * start(responder)
475 : : * |
476 : : * | start(initiator) /---------\
477 : : * | | | |
478 : : * v v v |
479 : : * KEY_MAYBE_V1 -> KEY -> GARB_GARBTERM -> VERSION -> APP -> APP_READY
480 : : * |
481 : : * \-------> V1
482 : : */
483 : : enum class RecvState : uint8_t {
484 : : /** (Responder only) either v2 public key or v1 header.
485 : : *
486 : : * This is the initial state for responders, before data has been received to distinguish
487 : : * v1 from v2 connections. When that happens, the state becomes either KEY (for v2) or V1
488 : : * (for v1). */
489 : : KEY_MAYBE_V1,
490 : :
491 : : /** Public key.
492 : : *
493 : : * This is the initial state for initiators, during which the other side's public key is
494 : : * received. When that information arrives, the ciphers get initialized and the state
495 : : * becomes GARB_GARBTERM. */
496 : : KEY,
497 : :
498 : : /** Garbage and garbage terminator.
499 : : *
500 : : * Whenever a byte is received, the last 16 bytes are compared with the expected garbage
501 : : * terminator. When that happens, the state becomes VERSION. If no matching terminator is
502 : : * received in 4111 bytes (4095 for the maximum garbage length, and 16 bytes for the
503 : : * terminator), the connection aborts. */
504 : : GARB_GARBTERM,
505 : :
506 : : /** Version packet.
507 : : *
508 : : * A packet is received, and decrypted/verified. If that fails, the connection aborts. The
509 : : * first received packet in this state (whether it's a decoy or not) is expected to
510 : : * authenticate the garbage received during the GARB_GARBTERM state as associated
511 : : * authenticated data (AAD). The first non-decoy packet in this state is interpreted as
512 : : * version negotiation (currently, that means ignoring the contents, but it can be used for
513 : : * negotiating future extensions), and afterwards the state becomes APP. */
514 : : VERSION,
515 : :
516 : : /** Application packet.
517 : : *
518 : : * A packet is received, and decrypted/verified. If that succeeds, the state becomes
519 : : * APP_READY and the decrypted contents is kept in m_recv_decode_buffer until it is
520 : : * retrieved as a message by GetMessage(). */
521 : : APP,
522 : :
523 : : /** Nothing (an application packet is available for GetMessage()).
524 : : *
525 : : * Nothing can be received in this state. When the message is retrieved by GetMessage,
526 : : * the state becomes APP again. */
527 : : APP_READY,
528 : :
529 : : /** Nothing (this transport is using v1 fallback).
530 : : *
531 : : * All receive operations are redirected to m_v1_fallback. */
532 : : V1,
533 : : };
534 : :
535 : : /** State type that controls the sender side.
536 : : *
537 : : * Diagram:
538 : : *
539 : : * start(responder)
540 : : * |
541 : : * | start(initiator)
542 : : * | |
543 : : * v v
544 : : * MAYBE_V1 -> AWAITING_KEY -> READY
545 : : * |
546 : : * \-----> V1
547 : : */
548 : : enum class SendState : uint8_t {
549 : : /** (Responder only) Not sending until v1 or v2 is detected.
550 : : *
551 : : * This is the initial state for responders. The send buffer is empty.
552 : : * When the receiver determines whether this
553 : : * is a V1 or V2 connection, the sender state becomes AWAITING_KEY (for v2) or V1 (for v1).
554 : : */
555 : : MAYBE_V1,
556 : :
557 : : /** Waiting for the other side's public key.
558 : : *
559 : : * This is the initial state for initiators. The public key and garbage is sent out. When
560 : : * the receiver receives the other side's public key and transitions to GARB_GARBTERM, the
561 : : * sender state becomes READY. */
562 : : AWAITING_KEY,
563 : :
564 : : /** Normal sending state.
565 : : *
566 : : * In this state, the ciphers are initialized, so packets can be sent. When this state is
567 : : * entered, the garbage terminator and version packet are appended to the send buffer (in
568 : : * addition to the key and garbage which may still be there). In this state a message can be
569 : : * provided if the send buffer is empty. */
570 : : READY,
571 : :
572 : : /** This transport is using v1 fallback.
573 : : *
574 : : * All send operations are redirected to m_v1_fallback. */
575 : : V1,
576 : : };
577 : :
578 : : /** Cipher state. */
579 : : BIP324Cipher m_cipher;
580 : : /** Whether we are the initiator side. */
581 : : const bool m_initiating;
582 : : /** NodeId (for debug logging). */
583 : : const NodeId m_nodeid;
584 : : /** Encapsulate a V1Transport to fall back to. */
585 : : V1Transport m_v1_fallback;
586 : :
587 : : /** Lock for receiver-side fields. */
588 : : mutable Mutex m_recv_mutex ACQUIRED_BEFORE(m_send_mutex);
589 : : /** In {VERSION, APP}, the decrypted packet length, if m_recv_buffer.size() >=
590 : : * BIP324Cipher::LENGTH_LEN. Unspecified otherwise. */
591 : : uint32_t m_recv_len GUARDED_BY(m_recv_mutex) {0};
592 : : /** Receive buffer; meaning is determined by m_recv_state. */
593 : : std::vector<uint8_t> m_recv_buffer GUARDED_BY(m_recv_mutex);
594 : : /** AAD expected in next received packet (currently used only for garbage). */
595 : : std::vector<uint8_t> m_recv_aad GUARDED_BY(m_recv_mutex);
596 : : /** Buffer to put decrypted contents in, for converting to CNetMessage. */
597 : : std::vector<uint8_t> m_recv_decode_buffer GUARDED_BY(m_recv_mutex);
598 : : /** Current receiver state. */
599 : : RecvState m_recv_state GUARDED_BY(m_recv_mutex);
600 : :
601 : : /** Lock for sending-side fields. If both sending and receiving fields are accessed,
602 : : * m_recv_mutex must be acquired before m_send_mutex. */
603 : : mutable Mutex m_send_mutex ACQUIRED_AFTER(m_recv_mutex);
604 : : /** The send buffer; meaning is determined by m_send_state. */
605 : : std::vector<uint8_t> m_send_buffer GUARDED_BY(m_send_mutex);
606 : : /** How many bytes from the send buffer have been sent so far. */
607 : : uint32_t m_send_pos GUARDED_BY(m_send_mutex) {0};
608 : : /** The garbage sent, or to be sent (MAYBE_V1 and AWAITING_KEY state only). */
609 : : std::vector<uint8_t> m_send_garbage GUARDED_BY(m_send_mutex);
610 : : /** Type of the message being sent. */
611 : : std::string m_send_type GUARDED_BY(m_send_mutex);
612 : : /** Current sender state. */
613 : : SendState m_send_state GUARDED_BY(m_send_mutex);
614 : : /** Whether we've sent at least 24 bytes (which would trigger disconnect for V1 peers). */
615 : : bool m_sent_v1_header_worth GUARDED_BY(m_send_mutex) {false};
616 : :
617 : : /** Change the receive state. */
618 : : void SetReceiveState(RecvState recv_state) noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
619 : : /** Change the send state. */
620 : : void SetSendState(SendState send_state) noexcept EXCLUSIVE_LOCKS_REQUIRED(m_send_mutex);
621 : : /** Given a packet's contents, find the message type (if valid), and strip it from contents. */
622 : : static std::optional<std::string> GetMessageType(std::span<const uint8_t>& contents) noexcept;
623 : : /** Determine how many received bytes can be processed in one go (not allowed in V1 state). */
624 : : size_t GetMaxBytesToProcess() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
625 : : /** Put our public key + garbage in the send buffer. */
626 : : void StartSendingHandshake() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_send_mutex);
627 : : /** Process bytes in m_recv_buffer, while in KEY_MAYBE_V1 state. */
628 : : void ProcessReceivedMaybeV1Bytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex, !m_send_mutex);
629 : : /** Process bytes in m_recv_buffer, while in KEY state. */
630 : : bool ProcessReceivedKeyBytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex, !m_send_mutex);
631 : : /** Process bytes in m_recv_buffer, while in GARB_GARBTERM state. */
632 : : bool ProcessReceivedGarbageBytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
633 : : /** Process bytes in m_recv_buffer, while in VERSION/APP state. */
634 : : bool ProcessReceivedPacketBytes() noexcept EXCLUSIVE_LOCKS_REQUIRED(m_recv_mutex);
635 : :
636 : : public:
637 : : static constexpr uint32_t MAX_GARBAGE_LEN = 4095;
638 : :
639 : : /** Construct a V2 transport with securely generated random keys.
640 : : *
641 : : * @param[in] nodeid the node's NodeId (only for debug log output).
642 : : * @param[in] initiating whether we are the initiator side.
643 : : */
644 : : V2Transport(NodeId nodeid, bool initiating) noexcept;
645 : :
646 : : /** Construct a V2 transport with specified keys and garbage (test use only). */
647 : : V2Transport(NodeId nodeid, bool initiating, const CKey& key, std::span<const std::byte> ent32, std::vector<uint8_t> garbage) noexcept;
648 : :
649 : : // Receive side functions.
650 : : bool ReceivedMessageComplete() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex);
651 : : bool ReceivedBytes(std::span<const uint8_t>& msg_bytes) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex, !m_send_mutex);
652 : : CNetMessage GetReceivedMessage(std::chrono::microseconds time, bool& reject_message) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex);
653 : :
654 : : // Send side functions.
655 : : bool SetMessageToSend(CSerializedNetMsg& msg) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
656 : : BytesToSend GetBytesToSend(bool have_next_message) const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
657 : : void MarkBytesSent(size_t bytes_sent) noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
658 : : size_t GetSendMemoryUsage() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_send_mutex);
659 : :
660 : : // Miscellaneous functions.
661 : : bool ShouldReconnectV1() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex, !m_send_mutex);
662 : : Info GetInfo() const noexcept override EXCLUSIVE_LOCKS_REQUIRED(!m_recv_mutex);
663 : : };
664 : :
665 : 40 : struct CNodeOptions
666 : : {
667 : : NetPermissionFlags permission_flags = NetPermissionFlags::None;
668 : : std::unique_ptr<i2p::sam::Session> i2p_sam_session = nullptr;
669 : : bool prefer_evict = false;
670 : : size_t recv_flood_size{DEFAULT_MAXRECEIVEBUFFER * 1000};
671 : : bool use_v2transport = false;
672 : : };
673 : :
674 : : /** Information about a peer */
675 : : class CNode
676 : : {
677 : : public:
678 : : /** Transport serializer/deserializer. The receive side functions are only called under cs_vRecv, while
679 : : * the sending side functions are only called under cs_vSend. */
680 : : const std::unique_ptr<Transport> m_transport;
681 : :
682 : : const NetPermissionFlags m_permission_flags;
683 : :
684 : : /**
685 : : * Socket used for communication with the node.
686 : : * May not own a Sock object (after `CloseSocketDisconnect()` or during tests).
687 : : * `shared_ptr` (instead of `unique_ptr`) is used to avoid premature close of
688 : : * the underlying file descriptor by one thread while another thread is
689 : : * poll(2)-ing it for activity.
690 : : * @see https://github.com/bitcoin/bitcoin/issues/21744 for details.
691 : : */
692 : : std::shared_ptr<Sock> m_sock GUARDED_BY(m_sock_mutex);
693 : :
694 : : /** Sum of GetMemoryUsage of all vSendMsg entries. */
695 : : size_t m_send_memusage GUARDED_BY(cs_vSend){0};
696 : : /** Total number of bytes sent on the wire to this peer. */
697 : : uint64_t nSendBytes GUARDED_BY(cs_vSend){0};
698 : : /** Messages still to be fed to m_transport->SetMessageToSend. */
699 : : std::deque<CSerializedNetMsg> vSendMsg GUARDED_BY(cs_vSend);
700 : : Mutex cs_vSend;
701 : : Mutex m_sock_mutex;
702 : : Mutex cs_vRecv;
703 : :
704 : : uint64_t nRecvBytes GUARDED_BY(cs_vRecv){0};
705 : :
706 : : std::atomic<std::chrono::seconds> m_last_send{0s};
707 : : std::atomic<std::chrono::seconds> m_last_recv{0s};
708 : : //! Unix epoch time at peer connection
709 : : const std::chrono::seconds m_connected;
710 : : // Address of this peer
711 : : const CAddress addr;
712 : : // Bind address of our side of the connection
713 : : const CService addrBind;
714 : : const std::string m_addr_name;
715 : : /** The pszDest argument provided to ConnectNode(). Only used for reconnections. */
716 : : const std::string m_dest;
717 : : //! Whether this peer is an inbound onion, i.e. connected via our Tor onion service.
718 : : const bool m_inbound_onion;
719 : : std::atomic<int> nVersion{0};
720 : : Mutex m_subver_mutex;
721 : : /**
722 : : * cleanSubVer is a sanitized string of the user agent byte array we read
723 : : * from the wire. This cleaned string can safely be logged or displayed.
724 : : */
725 : : std::string cleanSubVer GUARDED_BY(m_subver_mutex){};
726 : : const bool m_prefer_evict{false}; // This peer is preferred for eviction.
727 : 17 : bool HasPermission(NetPermissionFlags permission) const {
728 [ # # ][ + + : 17 : return NetPermissions::HasFlag(m_permission_flags, permission);
- - - - +
- - + - -
+ - - - -
- - - - -
- - - - -
- - - - -
- - ]
729 : : }
730 : : /** fSuccessfullyConnected is set to true on receiving VERACK from the peer. */
731 : : std::atomic_bool fSuccessfullyConnected{false};
732 : : // Setting fDisconnect to true will cause the node to be disconnected the
733 : : // next time DisconnectNodes() runs
734 : : std::atomic_bool fDisconnect{false};
735 : : CountingSemaphoreGrant<> grantOutbound;
736 : : std::atomic<int> nRefCount{0};
737 : :
738 : : const uint64_t nKeyedNetGroup;
739 : : std::atomic_bool fPauseRecv{false};
740 : : std::atomic_bool fPauseSend{false};
741 : :
742 : : /** Network key used to prevent fingerprinting our node across networks.
743 : : * Influenced by the network and the bind address (+ bind port for inbounds) */
744 : : const uint64_t m_network_key;
745 : :
746 : : const ConnectionType m_conn_type;
747 : :
748 : : /** Move all messages from the received queue to the processing queue. */
749 : : void MarkReceivedMsgsForProcessing()
750 : : EXCLUSIVE_LOCKS_REQUIRED(!m_msg_process_queue_mutex);
751 : :
752 : : /** Poll the next message from the processing queue of this connection.
753 : : *
754 : : * Returns std::nullopt if the processing queue is empty, or a pair
755 : : * consisting of the message and a bool that indicates if the processing
756 : : * queue has more entries. */
757 : : std::optional<std::pair<CNetMessage, bool>> PollMessage()
758 : : EXCLUSIVE_LOCKS_REQUIRED(!m_msg_process_queue_mutex);
759 : :
760 : : /** Account for the total size of a sent message in the per msg type connection stats. */
761 : 0 : void AccountForSentBytes(const std::string& msg_type, size_t sent_bytes)
762 : : EXCLUSIVE_LOCKS_REQUIRED(cs_vSend)
763 : : {
764 : 0 : mapSendBytesPerMsgType[msg_type] += sent_bytes;
765 : 0 : }
766 : :
767 : 6 : bool IsOutboundOrBlockRelayConn() const {
768 [ + - + ]: 6 : switch (m_conn_type) {
769 : : case ConnectionType::OUTBOUND_FULL_RELAY:
770 : : case ConnectionType::BLOCK_RELAY:
771 : : return true;
772 : 1 : case ConnectionType::INBOUND:
773 : 1 : case ConnectionType::MANUAL:
774 : 1 : case ConnectionType::ADDR_FETCH:
775 : 1 : case ConnectionType::FEELER:
776 : 1 : return false;
777 : : } // no default case, so the compiler can warn about missing cases
778 : :
779 : 0 : assert(false);
780 : : }
781 : :
782 : 105 : bool IsFullOutboundConn() const {
783 [ + - + - : 105 : return m_conn_type == ConnectionType::OUTBOUND_FULL_RELAY;
+ - + - ]
[ - - + +
- - ]
[ + - - - ]
784 : : }
785 : :
786 : 8 : bool IsManualConn() const {
787 [ + - + - : 8 : return m_conn_type == ConnectionType::MANUAL;
+ - + - ]
[ - + ]
788 : : }
789 : :
790 : 23 : bool IsManualOrFullOutboundConn() const
791 : : {
792 [ + - + ]: 23 : switch (m_conn_type) {
793 : : case ConnectionType::INBOUND:
794 : : case ConnectionType::FEELER:
795 : : case ConnectionType::BLOCK_RELAY:
796 : : case ConnectionType::ADDR_FETCH:
797 : : return false;
798 : 15 : case ConnectionType::OUTBOUND_FULL_RELAY:
799 : 15 : case ConnectionType::MANUAL:
800 : 15 : return true;
801 : : } // no default case, so the compiler can warn about missing cases
802 : :
803 : 0 : assert(false);
804 : : }
805 : :
806 : 116 : bool IsBlockOnlyConn() const {
807 [ - + ][ + - : 116 : return m_conn_type == ConnectionType::BLOCK_RELAY;
+ - + - +
- ]
[ - - + + ]
[ + - + -
+ - + - +
- + + ]
808 : : }
809 : :
810 : 6 : bool IsFeelerConn() const {
811 [ + - + - : 6 : return m_conn_type == ConnectionType::FEELER;
+ - + - ]
[ - + ]
812 : : }
813 : :
814 : 10 : bool IsAddrFetchConn() const {
815 [ + + + - : 10 : return m_conn_type == ConnectionType::ADDR_FETCH;
+ - + - ]
816 : : }
817 : :
818 : 99 : bool IsInboundConn() const {
819 [ + - ][ + - : 95 : return m_conn_type == ConnectionType::INBOUND;
+ - + - +
- ][ - - +
- - - - -
+ + ][ + +
- + + - +
- - + - +
- + - + +
- + - + -
- + - - -
- ]
820 : : }
821 : :
822 : 2 : bool ExpectServicesFromConn() const {
823 [ + - - ]: 2 : switch (m_conn_type) {
824 : : case ConnectionType::INBOUND:
825 : : case ConnectionType::MANUAL:
826 : : case ConnectionType::FEELER:
827 : : return false;
828 : 2 : case ConnectionType::OUTBOUND_FULL_RELAY:
829 : 2 : case ConnectionType::BLOCK_RELAY:
830 : 2 : case ConnectionType::ADDR_FETCH:
831 : 2 : return true;
832 : : } // no default case, so the compiler can warn about missing cases
833 : :
834 : 0 : assert(false);
835 : : }
836 : :
837 : : /**
838 : : * Get network the peer connected through.
839 : : *
840 : : * Returns Network::NET_ONION for *inbound* onion connections,
841 : : * and CNetAddr::GetNetClass() otherwise. The latter cannot be used directly
842 : : * because it doesn't detect the former, and it's not the responsibility of
843 : : * the CNetAddr class to know the actual network a peer is connected through.
844 : : *
845 : : * @return network the peer connected through.
846 : : */
847 : : Network ConnectedThroughNetwork() const;
848 : :
849 : : /** Whether this peer connected through a privacy network. */
850 : : [[nodiscard]] bool IsConnectedThroughPrivacyNet() const;
851 : :
852 : : // We selected peer as (compact blocks) high-bandwidth peer (BIP152)
853 : : std::atomic<bool> m_bip152_highbandwidth_to{false};
854 : : // Peer selected us as (compact blocks) high-bandwidth peer (BIP152)
855 : : std::atomic<bool> m_bip152_highbandwidth_from{false};
856 : :
857 : : /** Whether this peer provides all services that we want. Used for eviction decisions */
858 : : std::atomic_bool m_has_all_wanted_services{false};
859 : :
860 : : /** Whether we should relay transactions to this peer. This only changes
861 : : * from false to true. It will never change back to false. */
862 : : std::atomic_bool m_relays_txs{false};
863 : :
864 : : /** Whether this peer has loaded a bloom filter. Used only in inbound
865 : : * eviction logic. */
866 : : std::atomic_bool m_bloom_filter_loaded{false};
867 : :
868 : : /** UNIX epoch time of the last block received from this peer that we had
869 : : * not yet seen (e.g. not already received from another peer), that passed
870 : : * preliminary validity checks and was saved to disk, even if we don't
871 : : * connect the block or it eventually fails connection. Used as an inbound
872 : : * peer eviction criterium in CConnman::AttemptToEvictConnection. */
873 : : std::atomic<std::chrono::seconds> m_last_block_time{0s};
874 : :
875 : : /** UNIX epoch time of the last transaction received from this peer that we
876 : : * had not yet seen (e.g. not already received from another peer) and that
877 : : * was accepted into our mempool. Used as an inbound peer eviction criterium
878 : : * in CConnman::AttemptToEvictConnection. */
879 : : std::atomic<std::chrono::seconds> m_last_tx_time{0s};
880 : :
881 : : /** Last measured round-trip time. Used only for RPC/GUI stats/debugging.*/
882 : : std::atomic<std::chrono::microseconds> m_last_ping_time{0us};
883 : :
884 : : /** Lowest measured round-trip time. Used as an inbound peer eviction
885 : : * criterium in CConnman::AttemptToEvictConnection. */
886 : : std::atomic<std::chrono::microseconds> m_min_ping_time{std::chrono::microseconds::max()};
887 : :
888 : : CNode(NodeId id,
889 : : std::shared_ptr<Sock> sock,
890 : : const CAddress& addrIn,
891 : : uint64_t nKeyedNetGroupIn,
892 : : uint64_t nLocalHostNonceIn,
893 : : const CService& addrBindIn,
894 : : const std::string& addrNameIn,
895 : : ConnectionType conn_type_in,
896 : : bool inbound_onion,
897 : : uint64_t network_key,
898 : : CNodeOptions&& node_opts = {});
899 : : CNode(const CNode&) = delete;
900 : : CNode& operator=(const CNode&) = delete;
901 : :
902 : 337 : NodeId GetId() const {
903 [ + - ][ + - : 296 : return id;
+ - + - +
- + - ][ +
+ - - - -
- - + - -
- + - ][ +
- + - - -
- - - - -
- - - + -
+ - + - +
- - + - -
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- - - - -
- - - - -
- - - - -
- ]
904 : : }
905 : :
906 : 2 : uint64_t GetLocalNonce() const {
907 [ # # ]: 2 : return nLocalHostNonce;
908 : : }
909 : :
910 : 0 : int GetRefCount() const
911 : : {
912 [ # # ]: 0 : assert(nRefCount >= 0);
913 : 0 : return nRefCount;
914 : : }
915 : :
916 : : /**
917 : : * Receive bytes from the buffer and deserialize them into messages.
918 : : *
919 : : * @param[in] msg_bytes The raw data
920 : : * @param[out] complete Set True if at least one message has been
921 : : * deserialized and is ready to be processed
922 : : * @return True if the peer should stay connected,
923 : : * False if the peer should be disconnected from.
924 : : */
925 : : bool ReceiveMsgBytes(std::span<const uint8_t> msg_bytes, bool& complete) EXCLUSIVE_LOCKS_REQUIRED(!cs_vRecv);
926 : :
927 : 26 : void SetCommonVersion(int greatest_common_version)
928 : : {
929 : 26 : Assume(m_greatest_common_version == INIT_PROTO_VERSION);
930 : 26 : m_greatest_common_version = greatest_common_version;
931 : 26 : }
932 : 18 : int GetCommonVersion() const
933 : : {
934 [ + - ][ + - : 18 : return m_greatest_common_version;
+ - + - +
- - - - -
- - - - ]
935 : : }
936 : :
937 : : CService GetAddrLocal() const EXCLUSIVE_LOCKS_REQUIRED(!m_addr_local_mutex);
938 : : //! May not be called more than once
939 : : void SetAddrLocal(const CService& addrLocalIn) EXCLUSIVE_LOCKS_REQUIRED(!m_addr_local_mutex);
940 : :
941 : 0 : CNode* AddRef()
942 : : {
943 : 0 : nRefCount++;
944 : 0 : return this;
945 : : }
946 : :
947 : 0 : void Release()
948 : : {
949 [ # # ]: 0 : nRefCount--;
950 : : }
951 : :
952 : : void CloseSocketDisconnect() EXCLUSIVE_LOCKS_REQUIRED(!m_sock_mutex);
953 : :
954 : : void CopyStats(CNodeStats& stats) EXCLUSIVE_LOCKS_REQUIRED(!m_subver_mutex, !m_addr_local_mutex, !cs_vSend, !cs_vRecv);
955 : :
956 [ # # ][ + - : 2 : std::string ConnectionTypeAsString() const { return ::ConnectionTypeAsString(m_conn_type); }
- - - - ]
957 : :
958 : : /**
959 : : * Helper function to optionally log the IP address.
960 : : *
961 : : * @param[in] log_ip whether to include the IP address
962 : : * @return " peeraddr=..." or ""
963 : : */
964 : : std::string LogIP(bool log_ip) const;
965 : :
966 : : /**
967 : : * Helper function to log disconnects.
968 : : *
969 : : * @param[in] log_ip whether to include the IP address
970 : : * @return "disconnecting peer=..." and optionally "peeraddr=..."
971 : : */
972 : : std::string DisconnectMsg(bool log_ip) const;
973 : :
974 : : /** A ping-pong round trip has completed successfully. Update latest and minimum ping times. */
975 : 0 : void PongReceived(std::chrono::microseconds ping_time) {
976 : 0 : m_last_ping_time = ping_time;
977 : 0 : m_min_ping_time = std::min(m_min_ping_time.load(), ping_time);
978 : 0 : }
979 : :
980 : : private:
981 : : const NodeId id;
982 : : const uint64_t nLocalHostNonce;
983 : : std::atomic<int> m_greatest_common_version{INIT_PROTO_VERSION};
984 : :
985 : : const size_t m_recv_flood_size;
986 : : std::list<CNetMessage> vRecvMsg; // Used only by SocketHandler thread
987 : :
988 : : Mutex m_msg_process_queue_mutex;
989 : : std::list<CNetMessage> m_msg_process_queue GUARDED_BY(m_msg_process_queue_mutex);
990 : : size_t m_msg_process_queue_size GUARDED_BY(m_msg_process_queue_mutex){0};
991 : :
992 : : // Our address, as reported by the peer
993 : : CService m_addr_local GUARDED_BY(m_addr_local_mutex);
994 : : mutable Mutex m_addr_local_mutex;
995 : :
996 : : mapMsgTypeSize mapSendBytesPerMsgType GUARDED_BY(cs_vSend);
997 : : mapMsgTypeSize mapRecvBytesPerMsgType GUARDED_BY(cs_vRecv);
998 : :
999 : : /**
1000 : : * If an I2P session is created per connection (for outbound transient I2P
1001 : : * connections) then it is stored here so that it can be destroyed when the
1002 : : * socket is closed. I2P sessions involve a data/transport socket (in `m_sock`)
1003 : : * and a control socket (in `m_i2p_sam_session`). For transient sessions, once
1004 : : * the data socket is closed, the control socket is not going to be used anymore
1005 : : * and is just taking up resources. So better close it as soon as `m_sock` is
1006 : : * closed.
1007 : : * Otherwise this unique_ptr is empty.
1008 : : */
1009 : : std::unique_ptr<i2p::sam::Session> m_i2p_sam_session GUARDED_BY(m_sock_mutex);
1010 : : };
1011 : :
1012 : : /**
1013 : : * Interface for message handling
1014 : : */
1015 : 182 : class NetEventsInterface
1016 : : {
1017 : : public:
1018 : : /** Mutex for anything that is only accessed via the msg processing thread */
1019 : : static Mutex g_msgproc_mutex;
1020 : :
1021 : : /** Initialize a peer (setup state) */
1022 : : virtual void InitializeNode(const CNode& node, ServiceFlags our_services) = 0;
1023 : :
1024 : : /** Handle removal of a peer (clear state) */
1025 : : virtual void FinalizeNode(const CNode& node) = 0;
1026 : :
1027 : : /**
1028 : : * Callback to determine whether the given set of service flags are sufficient
1029 : : * for a peer to be "relevant".
1030 : : */
1031 : : virtual bool HasAllDesirableServiceFlags(ServiceFlags services) const = 0;
1032 : :
1033 : : /**
1034 : : * Process protocol messages received from a given node
1035 : : *
1036 : : * @param[in] pnode The node which we have received messages from.
1037 : : * @param[in] interrupt Interrupt condition for processing threads
1038 : : * @return True if there is more work to be done
1039 : : */
1040 : : virtual bool ProcessMessages(CNode* pnode, std::atomic<bool>& interrupt) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex) = 0;
1041 : :
1042 : : /**
1043 : : * Send queued protocol messages to a given node.
1044 : : *
1045 : : * @param[in] pnode The node which we are sending messages to.
1046 : : * @return True if there is more work to be done
1047 : : */
1048 : : virtual bool SendMessages(CNode* pnode) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex) = 0;
1049 : :
1050 : :
1051 : : protected:
1052 : : /**
1053 : : * Protected destructor so that instances can only be deleted by derived classes.
1054 : : * If that restriction is no longer desired, this should be made public and virtual.
1055 : : */
1056 : : ~NetEventsInterface() = default;
1057 : : };
1058 : :
1059 : : class CConnman
1060 : : {
1061 : : public:
1062 : :
1063 : : struct Options
1064 : : {
1065 : : ServiceFlags m_local_services = NODE_NONE;
1066 : : int m_max_automatic_connections = 0;
1067 : : CClientUIInterface* uiInterface = nullptr;
1068 : : NetEventsInterface* m_msgproc = nullptr;
1069 : : BanMan* m_banman = nullptr;
1070 : : unsigned int nSendBufferMaxSize = 0;
1071 : : unsigned int nReceiveFloodSize = 0;
1072 : : uint64_t nMaxOutboundLimit = 0;
1073 : : int64_t m_peer_connect_timeout = DEFAULT_PEER_CONNECT_TIMEOUT;
1074 : : std::vector<std::string> vSeedNodes;
1075 : : std::vector<NetWhitelistPermissions> vWhitelistedRangeIncoming;
1076 : : std::vector<NetWhitelistPermissions> vWhitelistedRangeOutgoing;
1077 : : std::vector<NetWhitebindPermissions> vWhiteBinds;
1078 : : std::vector<CService> vBinds;
1079 : : std::vector<CService> onion_binds;
1080 : : /// True if the user did not specify -bind= or -whitebind= and thus
1081 : : /// we should bind on `0.0.0.0` (IPv4) and `::` (IPv6).
1082 : : bool bind_on_any;
1083 : : bool m_use_addrman_outgoing = true;
1084 : : std::vector<std::string> m_specified_outgoing;
1085 : : std::vector<std::string> m_added_nodes;
1086 : : bool m_i2p_accept_incoming;
1087 : : bool whitelist_forcerelay = DEFAULT_WHITELISTFORCERELAY;
1088 : : bool whitelist_relay = DEFAULT_WHITELISTRELAY;
1089 : : };
1090 : :
1091 : 359 : void Init(const Options& connOptions) EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex, !m_total_bytes_sent_mutex)
1092 : : {
1093 : 359 : AssertLockNotHeld(m_total_bytes_sent_mutex);
1094 : :
1095 [ + + ]: 359 : m_local_services = connOptions.m_local_services;
1096 : 359 : m_max_automatic_connections = connOptions.m_max_automatic_connections;
1097 [ + + ]: 359 : m_max_outbound_full_relay = std::min(MAX_OUTBOUND_FULL_RELAY_CONNECTIONS, m_max_automatic_connections);
1098 [ + + ]: 359 : m_max_outbound_block_relay = std::min(MAX_BLOCK_RELAY_ONLY_CONNECTIONS, m_max_automatic_connections - m_max_outbound_full_relay);
1099 : 359 : m_max_automatic_outbound = m_max_outbound_full_relay + m_max_outbound_block_relay + m_max_feeler;
1100 [ + + ]: 359 : m_max_inbound = std::max(0, m_max_automatic_connections - m_max_automatic_outbound);
1101 : 359 : m_use_addrman_outgoing = connOptions.m_use_addrman_outgoing;
1102 : 359 : m_client_interface = connOptions.uiInterface;
1103 : 359 : m_banman = connOptions.m_banman;
1104 : 359 : m_msgproc = connOptions.m_msgproc;
1105 : 359 : nSendBufferMaxSize = connOptions.nSendBufferMaxSize;
1106 : 359 : nReceiveFloodSize = connOptions.nReceiveFloodSize;
1107 : 359 : m_peer_connect_timeout = std::chrono::seconds{connOptions.m_peer_connect_timeout};
1108 : 359 : {
1109 : 359 : LOCK(m_total_bytes_sent_mutex);
1110 [ + - ]: 359 : nMaxOutboundLimit = connOptions.nMaxOutboundLimit;
1111 : 359 : }
1112 : 359 : vWhitelistedRangeIncoming = connOptions.vWhitelistedRangeIncoming;
1113 : 359 : vWhitelistedRangeOutgoing = connOptions.vWhitelistedRangeOutgoing;
1114 : 359 : {
1115 : 359 : LOCK(m_added_nodes_mutex);
1116 : : // Attempt v2 connection if we support v2 - we'll reconnect with v1 if our
1117 : : // peer doesn't support it or immediately disconnects us for another reason.
1118 [ + - ]: 359 : const bool use_v2transport(GetLocalServices() & NODE_P2P_V2);
1119 [ - + ]: 359 : for (const std::string& added_node : connOptions.m_added_nodes) {
1120 [ # # ]: 0 : m_added_node_params.push_back({added_node, use_v2transport});
1121 : : }
1122 : 359 : }
1123 : 359 : m_onion_binds = connOptions.onion_binds;
1124 : 359 : whitelist_forcerelay = connOptions.whitelist_forcerelay;
1125 : 359 : whitelist_relay = connOptions.whitelist_relay;
1126 [ - - ]: 359 : }
1127 : :
1128 : : CConnman(uint64_t seed0,
1129 : : uint64_t seed1,
1130 : : AddrMan& addrman,
1131 : : const NetGroupManager& netgroupman,
1132 : : const CChainParams& params,
1133 : : bool network_active = true,
1134 : : std::shared_ptr<CThreadInterrupt> interrupt_net = std::make_shared<CThreadInterrupt>());
1135 : :
1136 : : ~CConnman();
1137 : :
1138 : : bool Start(CScheduler& scheduler, const Options& options) EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex, !m_added_nodes_mutex, !m_addr_fetches_mutex, !mutexMsgProc);
1139 : :
1140 : : void StopThreads();
1141 : : void StopNodes();
1142 : 182 : void Stop()
1143 : : {
1144 [ + - ]: 182 : StopThreads();
1145 [ + - ]: 182 : StopNodes();
1146 : 1 : };
1147 : :
1148 : : void Interrupt() EXCLUSIVE_LOCKS_REQUIRED(!mutexMsgProc);
1149 [ + - ]: 8 : bool GetNetworkActive() const { return fNetworkActive; };
[ # # # # ]
1150 [ + - ]: 3 : bool GetUseAddrmanOutgoing() const { return m_use_addrman_outgoing; };
1151 : : void SetNetworkActive(bool active);
1152 : :
1153 : : /**
1154 : : * Open a new P2P connection and initialize it with the PeerManager at `m_msgproc`.
1155 : : * @param[in] addrConnect Address to connect to, if `pszDest` is `nullptr`.
1156 : : * @param[in] fCountFailure Increment the number of connection attempts to this address in Addrman.
1157 : : * @param[in] grant_outbound Take ownership of this grant, to be released later when the connection is closed.
1158 : : * @param[in] pszDest Address to resolve and connect to.
1159 : : * @param[in] conn_type Type of the connection to open, must not be `ConnectionType::INBOUND`.
1160 : : * @param[in] use_v2transport Use P2P encryption, (aka V2 transport, BIP324).
1161 : : * @param[in] proxy_override Optional proxy to use and override normal proxy selection.
1162 : : * @retval true The connection was opened successfully.
1163 : : * @retval false The connection attempt failed.
1164 : : */
1165 : : bool OpenNetworkConnection(const CAddress& addrConnect,
1166 : : bool fCountFailure,
1167 : : CountingSemaphoreGrant<>&& grant_outbound,
1168 : : const char* pszDest,
1169 : : ConnectionType conn_type,
1170 : : bool use_v2transport,
1171 [ # # ][ # # : 0 : const std::optional<Proxy>& proxy_override = std::nullopt)
# # # # #
# # # # #
# # ]
1172 : : EXCLUSIVE_LOCKS_REQUIRED(!m_unused_i2p_sessions_mutex);
1173 : :
1174 : : bool CheckIncomingNonce(uint64_t nonce);
1175 : : void ASMapHealthCheck();
1176 : :
1177 : : // alias for thread safety annotations only, not defined
1178 : : RecursiveMutex& GetNodesMutex() const LOCK_RETURNED(m_nodes_mutex);
1179 : :
1180 : : bool ForNode(NodeId id, std::function<bool(CNode* pnode)> func);
1181 : :
1182 : : void PushMessage(CNode* pnode, CSerializedNetMsg&& msg) EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1183 : :
1184 : : using NodeFn = std::function<void(CNode*)>;
1185 : 7 : void ForEachNode(const NodeFn& func)
1186 : : {
1187 : 7 : LOCK(m_nodes_mutex);
1188 [ + + ]: 55 : for (auto&& node : m_nodes) {
1189 [ + - + + ]: 48 : if (NodeFullyConnected(node))
1190 [ + - ]: 47 : func(node);
1191 : : }
1192 : 7 : };
1193 : :
1194 : : void ForEachNode(const NodeFn& func) const
1195 : : {
1196 : : LOCK(m_nodes_mutex);
1197 : : for (auto&& node : m_nodes) {
1198 : : if (NodeFullyConnected(node))
1199 : : func(node);
1200 : : }
1201 : : };
1202 : :
1203 : : // Addrman functions
1204 : : /**
1205 : : * Return randomly selected addresses. This function does not use the address response cache and
1206 : : * should only be used in trusted contexts.
1207 : : *
1208 : : * An untrusted caller (e.g. from p2p) should instead use @ref GetAddresses to use the cache.
1209 : : *
1210 : : * @param[in] max_addresses Maximum number of addresses to return (0 = all).
1211 : : * @param[in] max_pct Maximum percentage of addresses to return (0 = all). Value must be from 0 to 100.
1212 : : * @param[in] network Select only addresses of this network (nullopt = all).
1213 : : * @param[in] filtered Select only addresses that are considered high quality (false = all).
1214 : : */
1215 : : std::vector<CAddress> GetAddressesUnsafe(size_t max_addresses, size_t max_pct, std::optional<Network> network, const bool filtered = true) const;
1216 : : /**
1217 : : * Return addresses from the per-requestor cache. If no cache entry exists, it is populated with
1218 : : * randomly selected addresses. This function can be used in untrusted contexts.
1219 : : *
1220 : : * A trusted caller (e.g. from RPC or a peer with addr permission) can use
1221 : : * @ref GetAddressesUnsafe to avoid using the cache.
1222 : : *
1223 : : * @param[in] requestor The requesting peer. Used to key the cache to prevent privacy leaks.
1224 : : * @param[in] max_addresses Maximum number of addresses to return (0 = all). Ignored when cache
1225 : : * already contains an entry for requestor.
1226 : : * @param[in] max_pct Maximum percentage of addresses to return (0 = all). Value must be
1227 : : * from 0 to 100. Ignored when cache already contains an entry for
1228 : : * requestor.
1229 : : */
1230 : : std::vector<CAddress> GetAddresses(CNode& requestor, size_t max_addresses, size_t max_pct);
1231 : :
1232 : : // This allows temporarily exceeding m_max_outbound_full_relay, with the goal of finding
1233 : : // a peer that is better than all our current peers.
1234 : : void SetTryNewOutboundPeer(bool flag);
1235 : : bool GetTryNewOutboundPeer() const;
1236 : :
1237 : : void StartExtraBlockRelayPeers();
1238 : :
1239 : : // Count the number of full-relay peer we have.
1240 : : int GetFullOutboundConnCount() const;
1241 : : // Return the number of outbound peers we have in excess of our target (eg,
1242 : : // if we previously called SetTryNewOutboundPeer(true), and have since set
1243 : : // to false, we may have extra peers that we wish to disconnect). This may
1244 : : // return a value less than (num_outbound_connections - num_outbound_slots)
1245 : : // in cases where some outbound connections are not yet fully connected, or
1246 : : // not yet fully disconnected.
1247 : : int GetExtraFullOutboundCount() const;
1248 : : // Count the number of block-relay-only peers we have over our limit.
1249 : : int GetExtraBlockRelayCount() const;
1250 : :
1251 : : bool AddNode(const AddedNodeParams& add) EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex);
1252 : : bool RemoveAddedNode(std::string_view node) EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex);
1253 : : bool AddedNodesContain(const CAddress& addr) const EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex);
1254 : : std::vector<AddedNodeInfo> GetAddedNodeInfo(bool include_connected) const EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex);
1255 : :
1256 : : /**
1257 : : * Attempts to open a connection. Currently only used from tests.
1258 : : *
1259 : : * @param[in] address Address of node to try connecting to
1260 : : * @param[in] conn_type ConnectionType::OUTBOUND, ConnectionType::BLOCK_RELAY,
1261 : : * ConnectionType::ADDR_FETCH or ConnectionType::FEELER
1262 : : * @param[in] use_v2transport Set to true if node attempts to connect using BIP 324 v2 transport protocol.
1263 : : * @return bool Returns false if there are no available
1264 : : * slots for this connection:
1265 : : * - conn_type not a supported ConnectionType
1266 : : * - Max total outbound connection capacity filled
1267 : : * - Max connection capacity for type is filled
1268 : : */
1269 : : bool AddConnection(const std::string& address, ConnectionType conn_type, bool use_v2transport) EXCLUSIVE_LOCKS_REQUIRED(!m_unused_i2p_sessions_mutex);
1270 : :
1271 : : size_t GetNodeCount(ConnectionDirection) const;
1272 : : std::map<CNetAddr, LocalServiceInfo> getNetLocalAddresses() const;
1273 : : uint32_t GetMappedAS(const CNetAddr& addr) const;
1274 : : void GetNodeStats(std::vector<CNodeStats>& vstats) const;
1275 : : bool DisconnectNode(std::string_view node);
1276 : : bool DisconnectNode(const CSubNet& subnet);
1277 : : bool DisconnectNode(const CNetAddr& addr);
1278 : : bool DisconnectNode(NodeId id);
1279 : :
1280 : : //! Used to convey which local services we are offering peers during node
1281 : : //! connection.
1282 : : //!
1283 : : //! The data returned by this is used in CNode construction,
1284 : : //! which is used to advertise which services we are offering
1285 : : //! that peer during `net_processing.cpp:PushNodeVersion()`.
1286 : : ServiceFlags GetLocalServices() const;
1287 : :
1288 : : //! Updates the local services that this node advertises to other peers
1289 : : //! during connection handshake.
1290 : 0 : void AddLocalServices(ServiceFlags services) { m_local_services = ServiceFlags(m_local_services | services); };
1291 : 0 : void RemoveLocalServices(ServiceFlags services) { m_local_services = ServiceFlags(m_local_services & ~services); }
1292 : :
1293 : : uint64_t GetMaxOutboundTarget() const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1294 : : std::chrono::seconds GetMaxOutboundTimeframe() const;
1295 : :
1296 : : //! check if the outbound target is reached
1297 : : //! if param historicalBlockServingLimit is set true, the function will
1298 : : //! response true if the limit for serving historical blocks has been reached
1299 : : bool OutboundTargetReached(bool historicalBlockServingLimit) const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1300 : :
1301 : : //! response the bytes left in the current max outbound cycle
1302 : : //! in case of no limit, it will always response 0
1303 : : uint64_t GetOutboundTargetBytesLeft() const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1304 : :
1305 : : std::chrono::seconds GetMaxOutboundTimeLeftInCycle() const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1306 : :
1307 : : uint64_t GetTotalBytesRecv() const;
1308 : : uint64_t GetTotalBytesSent() const EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1309 : :
1310 : : /** Get a unique deterministic randomizer. */
1311 : : CSipHasher GetDeterministicRandomizer(uint64_t id) const;
1312 : :
1313 : : void WakeMessageHandler() EXCLUSIVE_LOCKS_REQUIRED(!mutexMsgProc);
1314 : :
1315 : : /** Return true if we should disconnect the peer for failing an inactivity check. */
1316 : : bool ShouldRunInactivityChecks(const CNode& node, std::chrono::seconds now) const;
1317 : :
1318 : : bool MultipleManualOrFullOutboundConns(Network net) const EXCLUSIVE_LOCKS_REQUIRED(m_nodes_mutex);
1319 : :
1320 : : private:
1321 [ # # # # ]: 0 : struct ListenSocket {
1322 : : public:
1323 : : std::shared_ptr<Sock> sock;
1324 [ # # ]: 0 : inline void AddSocketPermissionFlags(NetPermissionFlags& flags) const { NetPermissions::AddFlag(flags, m_permissions); }
1325 : 0 : ListenSocket(std::shared_ptr<Sock> sock_, NetPermissionFlags permissions_)
1326 [ # # # # ]: 0 : : sock{sock_}, m_permissions{permissions_}
1327 : : {
1328 : : }
1329 : :
1330 : : private:
1331 : : NetPermissionFlags m_permissions;
1332 : : };
1333 : :
1334 : : //! returns the time left in the current max outbound cycle
1335 : : //! in case of no limit, it will always return 0
1336 : : std::chrono::seconds GetMaxOutboundTimeLeftInCycle_() const EXCLUSIVE_LOCKS_REQUIRED(m_total_bytes_sent_mutex);
1337 : :
1338 : : bool BindListenPort(const CService& bindAddr, bilingual_str& strError, NetPermissionFlags permissions);
1339 : : bool Bind(const CService& addr, unsigned int flags, NetPermissionFlags permissions);
1340 : : bool InitBinds(const Options& options);
1341 : :
1342 : : void ThreadOpenAddedConnections() EXCLUSIVE_LOCKS_REQUIRED(!m_added_nodes_mutex, !m_unused_i2p_sessions_mutex, !m_reconnections_mutex);
1343 : : void AddAddrFetch(const std::string& strDest) EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex);
1344 : : void ProcessAddrFetch() EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex, !m_unused_i2p_sessions_mutex);
1345 : : void ThreadOpenConnections(std::vector<std::string> connect, std::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);
1346 : : void ThreadMessageHandler() EXCLUSIVE_LOCKS_REQUIRED(!mutexMsgProc);
1347 : : void ThreadI2PAcceptIncoming();
1348 : : void AcceptConnection(const ListenSocket& hListenSocket);
1349 : :
1350 : : /**
1351 : : * Create a `CNode` object from a socket that has just been accepted and add the node to
1352 : : * the `m_nodes` member.
1353 : : * @param[in] sock Connected socket to communicate with the peer.
1354 : : * @param[in] permission_flags The peer's permissions.
1355 : : * @param[in] addr_bind The address and port at our side of the connection.
1356 : : * @param[in] addr The address and port at the peer's side of the connection.
1357 : : */
1358 : : void CreateNodeFromAcceptedSocket(std::unique_ptr<Sock>&& sock,
1359 : : NetPermissionFlags permission_flags,
1360 : : const CService& addr_bind,
1361 : : const CService& addr);
1362 : :
1363 : : void DisconnectNodes() EXCLUSIVE_LOCKS_REQUIRED(!m_reconnections_mutex, !m_nodes_mutex);
1364 : : void NotifyNumConnectionsChanged();
1365 : : /** Return true if the peer is inactive and should be disconnected. */
1366 : : bool InactivityCheck(const CNode& node) const;
1367 : :
1368 : : /**
1369 : : * Generate a collection of sockets to check for IO readiness.
1370 : : * @param[in] nodes Select from these nodes' sockets.
1371 : : * @return sockets to check for readiness
1372 : : */
1373 : : Sock::EventsPerSock GenerateWaitSockets(std::span<CNode* const> nodes);
1374 : :
1375 : : /**
1376 : : * Check connected and listening sockets for IO readiness and process them accordingly.
1377 : : */
1378 : : void SocketHandler() EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex, !mutexMsgProc);
1379 : :
1380 : : /**
1381 : : * Do the read/write for connected sockets that are ready for IO.
1382 : : * @param[in] nodes Nodes to process. The socket of each node is checked against `what`.
1383 : : * @param[in] events_per_sock Sockets that are ready for IO.
1384 : : */
1385 : : void SocketHandlerConnected(const std::vector<CNode*>& nodes,
1386 : : const Sock::EventsPerSock& events_per_sock)
1387 : : EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex, !mutexMsgProc);
1388 : :
1389 : : /**
1390 : : * Accept incoming connections, one from each read-ready listening socket.
1391 : : * @param[in] events_per_sock Sockets that are ready for IO.
1392 : : */
1393 : : void SocketHandlerListening(const Sock::EventsPerSock& events_per_sock);
1394 : :
1395 : : void ThreadSocketHandler() EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex, !mutexMsgProc, !m_nodes_mutex, !m_reconnections_mutex);
1396 : : void ThreadDNSAddressSeed() EXCLUSIVE_LOCKS_REQUIRED(!m_addr_fetches_mutex, !m_nodes_mutex);
1397 : :
1398 : : uint64_t CalculateKeyedNetGroup(const CNetAddr& ad) const;
1399 : :
1400 : : /**
1401 : : * Determine whether we're already connected to a given "host:port".
1402 : : * Note that for inbound connections, the peer is likely using a random outbound
1403 : : * port on their side, so this will likely not match any inbound connections.
1404 : : * @param[in] host String of the form "host[:port]", e.g. "localhost" or "localhost:8333" or "1.2.3.4:8333".
1405 : : * @return true if connected to `host`.
1406 : : */
1407 : : bool AlreadyConnectedToHost(std::string_view host) const;
1408 : :
1409 : : /**
1410 : : * Determine whether we're already connected to a given address:port.
1411 : : * Note that for inbound connections, the peer is likely using a random outbound
1412 : : * port on their side, so this will likely not match any inbound connections.
1413 : : * @param[in] addr_port Address and port to check.
1414 : : * @return true if connected to addr_port.
1415 : : */
1416 : : bool AlreadyConnectedToAddressPort(const CService& addr_port) const;
1417 : :
1418 : : /**
1419 : : * Determine whether we're already connected to a given address.
1420 : : */
1421 : : bool AlreadyConnectedToAddress(const CNetAddr& addr) const;
1422 : :
1423 : : bool AttemptToEvictConnection();
1424 : :
1425 : : /**
1426 : : * Open a new P2P connection.
1427 : : * @param[in] addrConnect Address to connect to, if `pszDest` is `nullptr`.
1428 : : * @param[in] pszDest Address to resolve and connect to.
1429 : : * @param[in] fCountFailure Increment the number of connection attempts to this address in Addrman.
1430 : : * @param[in] conn_type Type of the connection to open, must not be `ConnectionType::INBOUND`.
1431 : : * @param[in] use_v2transport Use P2P encryption, (aka V2 transport, BIP324).
1432 : : * @param[in] proxy_override Optional proxy to use and override normal proxy selection.
1433 : : * @return Newly created CNode object or nullptr if the connection failed.
1434 : : */
1435 : : CNode* ConnectNode(CAddress addrConnect,
1436 : : const char* pszDest,
1437 : : bool fCountFailure,
1438 : : ConnectionType conn_type,
1439 : : bool use_v2transport,
1440 : : const std::optional<Proxy>& proxy_override)
1441 : : EXCLUSIVE_LOCKS_REQUIRED(!m_unused_i2p_sessions_mutex);
1442 : :
1443 : : void AddWhitelistPermissionFlags(NetPermissionFlags& flags, std::optional<CNetAddr> addr, const std::vector<NetWhitelistPermissions>& ranges) const;
1444 : :
1445 : : void DeleteNode(CNode* pnode);
1446 : :
1447 : : NodeId GetNewNodeId();
1448 : :
1449 : : /** (Try to) send data from node's vSendMsg. Returns (bytes_sent, data_left). */
1450 : : std::pair<size_t, bool> SocketSendData(CNode& node) const EXCLUSIVE_LOCKS_REQUIRED(node.cs_vSend);
1451 : :
1452 : : void DumpAddresses();
1453 : :
1454 : : // Network stats
1455 : : void RecordBytesRecv(uint64_t bytes);
1456 : : void RecordBytesSent(uint64_t bytes) EXCLUSIVE_LOCKS_REQUIRED(!m_total_bytes_sent_mutex);
1457 : :
1458 : : /**
1459 : : Return reachable networks for which we have no addresses in addrman and therefore
1460 : : may require loading fixed seeds.
1461 : : */
1462 : : std::unordered_set<Network> GetReachableEmptyNetworks() const;
1463 : :
1464 : : /**
1465 : : * Return vector of current BLOCK_RELAY peers.
1466 : : */
1467 : : std::vector<CAddress> GetCurrentBlockRelayOnlyConns() const;
1468 : :
1469 : : /**
1470 : : * Search for a "preferred" network, a reachable network to which we
1471 : : * currently don't have any OUTBOUND_FULL_RELAY or MANUAL connections.
1472 : : * There needs to be at least one address in AddrMan for a preferred
1473 : : * network to be picked.
1474 : : *
1475 : : * @param[out] network Preferred network, if found.
1476 : : *
1477 : : * @return bool Whether a preferred network was found.
1478 : : */
1479 : : bool MaybePickPreferredNetwork(std::optional<Network>& network);
1480 : :
1481 : : // Whether the node should be passed out in ForEach* callbacks
1482 : : static bool NodeFullyConnected(const CNode* pnode);
1483 : :
1484 : : uint16_t GetDefaultPort(Network net) const;
1485 : : uint16_t GetDefaultPort(const std::string& addr) const;
1486 : :
1487 : : // Network usage totals
1488 : : mutable Mutex m_total_bytes_sent_mutex;
1489 : : std::atomic<uint64_t> nTotalBytesRecv{0};
1490 : : uint64_t nTotalBytesSent GUARDED_BY(m_total_bytes_sent_mutex) {0};
1491 : :
1492 : : // outbound limit & stats
1493 : : uint64_t nMaxOutboundTotalBytesSentInCycle GUARDED_BY(m_total_bytes_sent_mutex) {0};
1494 : : std::chrono::seconds nMaxOutboundCycleStartTime GUARDED_BY(m_total_bytes_sent_mutex) {0};
1495 : : uint64_t nMaxOutboundLimit GUARDED_BY(m_total_bytes_sent_mutex);
1496 : :
1497 : : // P2P timeout in seconds
1498 : : std::chrono::seconds m_peer_connect_timeout;
1499 : :
1500 : : // Whitelisted ranges. Any node connecting from these is automatically
1501 : : // whitelisted (as well as those connecting to whitelisted binds).
1502 : : std::vector<NetWhitelistPermissions> vWhitelistedRangeIncoming;
1503 : : // Whitelisted ranges for outgoing connections.
1504 : : std::vector<NetWhitelistPermissions> vWhitelistedRangeOutgoing;
1505 : :
1506 : : unsigned int nSendBufferMaxSize{0};
1507 : : unsigned int nReceiveFloodSize{0};
1508 : :
1509 : : std::vector<ListenSocket> vhListenSocket;
1510 : : std::atomic<bool> fNetworkActive{true};
1511 : : bool fAddressesInitialized{false};
1512 : : AddrMan& addrman;
1513 : : const NetGroupManager& m_netgroupman;
1514 : : std::deque<std::string> m_addr_fetches GUARDED_BY(m_addr_fetches_mutex);
1515 : : Mutex m_addr_fetches_mutex;
1516 : :
1517 : : // connection string and whether to use v2 p2p
1518 : : std::vector<AddedNodeParams> m_added_node_params GUARDED_BY(m_added_nodes_mutex);
1519 : :
1520 : : mutable Mutex m_added_nodes_mutex;
1521 : : std::vector<CNode*> m_nodes GUARDED_BY(m_nodes_mutex);
1522 : : std::list<CNode*> m_nodes_disconnected;
1523 : : mutable RecursiveMutex m_nodes_mutex;
1524 : : std::atomic<NodeId> nLastNodeId{0};
1525 : : unsigned int nPrevNodeCount{0};
1526 : :
1527 : : // Stores number of full-tx connections (outbound and manual) per network
1528 : : std::array<unsigned int, Network::NET_MAX> m_network_conn_counts GUARDED_BY(m_nodes_mutex) = {};
1529 : :
1530 : : /**
1531 : : * Cache responses to addr requests to minimize privacy leak.
1532 : : * Attack example: scraping addrs in real-time may allow an attacker
1533 : : * to infer new connections of the victim by detecting new records
1534 : : * with fresh timestamps (per self-announcement).
1535 : : */
1536 [ # # ]: 0 : struct CachedAddrResponse {
1537 : : std::vector<CAddress> m_addrs_response_cache;
1538 : : std::chrono::microseconds m_cache_entry_expiration{0};
1539 : : };
1540 : :
1541 : : /**
1542 : : * Addr responses stored in different caches
1543 : : * per (network, local socket) prevent cross-network node identification.
1544 : : * If a node for example is multi-homed under Tor and IPv6,
1545 : : * a single cache (or no cache at all) would let an attacker
1546 : : * to easily detect that it is the same node by comparing responses.
1547 : : * Indexing by local socket prevents leakage when a node has multiple
1548 : : * listening addresses on the same network.
1549 : : *
1550 : : * The used memory equals to 1000 CAddress records (or around 40 bytes) per
1551 : : * distinct Network (up to 5) we have/had an inbound peer from,
1552 : : * resulting in at most ~196 KB. Every separate local socket may
1553 : : * add up to ~196 KB extra.
1554 : : */
1555 : : std::map<uint64_t, CachedAddrResponse> m_addr_response_caches;
1556 : :
1557 : : /**
1558 : : * Services this node offers.
1559 : : *
1560 : : * This data is replicated in each Peer instance we create.
1561 : : *
1562 : : * This data is not marked const, but after being set it should not
1563 : : * change. Unless AssumeUTXO is started, in which case, the peer
1564 : : * will be limited until the background chain sync finishes.
1565 : : *
1566 : : * \sa Peer::our_services
1567 : : */
1568 : : std::atomic<ServiceFlags> m_local_services;
1569 : :
1570 : : std::unique_ptr<std::counting_semaphore<>> semOutbound;
1571 : : std::unique_ptr<std::counting_semaphore<>> semAddnode;
1572 : :
1573 : : /**
1574 : : * Maximum number of automatic connections permitted, excluding manual
1575 : : * connections but including inbounds. May be changed by the user and is
1576 : : * potentially limited by the operating system (number of file descriptors).
1577 : : */
1578 : : int m_max_automatic_connections;
1579 : :
1580 : : /*
1581 : : * Maximum number of peers by connection type. Might vary from defaults
1582 : : * based on -maxconnections init value.
1583 : : */
1584 : :
1585 : : // How many full-relay (tx, block, addr) outbound peers we want
1586 : : int m_max_outbound_full_relay;
1587 : :
1588 : : // How many block-relay only outbound peers we want
1589 : : // We do not relay tx or addr messages with these peers
1590 : : int m_max_outbound_block_relay;
1591 : :
1592 : : int m_max_addnode{MAX_ADDNODE_CONNECTIONS};
1593 : : int m_max_feeler{MAX_FEELER_CONNECTIONS};
1594 : : int m_max_automatic_outbound;
1595 : : int m_max_inbound;
1596 : :
1597 : : bool m_use_addrman_outgoing;
1598 : : CClientUIInterface* m_client_interface;
1599 : : NetEventsInterface* m_msgproc;
1600 : : /** Pointer to this node's banman. May be nullptr - check existence before dereferencing. */
1601 : : BanMan* m_banman;
1602 : :
1603 : : /**
1604 : : * Addresses that were saved during the previous clean shutdown. We'll
1605 : : * attempt to make block-relay-only connections to them.
1606 : : */
1607 : : std::vector<CAddress> m_anchors;
1608 : :
1609 : : /** SipHasher seeds for deterministic randomness */
1610 : : const uint64_t nSeed0, nSeed1;
1611 : :
1612 : : /** flag for waking the message processor. */
1613 : : bool fMsgProcWake GUARDED_BY(mutexMsgProc);
1614 : :
1615 : : std::condition_variable condMsgProc;
1616 : : Mutex mutexMsgProc;
1617 : : std::atomic<bool> flagInterruptMsgProc{false};
1618 : :
1619 : : /**
1620 : : * This is signaled when network activity should cease.
1621 : : * A copy of this is saved in `m_i2p_sam_session`.
1622 : : */
1623 : : const std::shared_ptr<CThreadInterrupt> m_interrupt_net;
1624 : :
1625 : : /**
1626 : : * I2P SAM session.
1627 : : * Used to accept incoming and make outgoing I2P connections from a persistent
1628 : : * address.
1629 : : */
1630 : : std::unique_ptr<i2p::sam::Session> m_i2p_sam_session;
1631 : :
1632 : : std::thread threadDNSAddressSeed;
1633 : : std::thread threadSocketHandler;
1634 : : std::thread threadOpenAddedConnections;
1635 : : std::thread threadOpenConnections;
1636 : : std::thread threadMessageHandler;
1637 : : std::thread threadI2PAcceptIncoming;
1638 : :
1639 : : /** flag for deciding to connect to an extra outbound peer,
1640 : : * in excess of m_max_outbound_full_relay
1641 : : * This takes the place of a feeler connection */
1642 : : std::atomic_bool m_try_another_outbound_peer;
1643 : :
1644 : : /** flag for initiating extra block-relay-only peer connections.
1645 : : * this should only be enabled after initial chain sync has occurred,
1646 : : * as these connections are intended to be short-lived and low-bandwidth.
1647 : : */
1648 : : std::atomic_bool m_start_extra_block_relay_peers{false};
1649 : :
1650 : : /**
1651 : : * A vector of -bind=<address>:<port>=onion arguments each of which is
1652 : : * an address and port that are designated for incoming Tor connections.
1653 : : */
1654 : : std::vector<CService> m_onion_binds;
1655 : :
1656 : : /**
1657 : : * flag for adding 'forcerelay' permission to whitelisted inbound
1658 : : * and manual peers with default permissions.
1659 : : */
1660 : : bool whitelist_forcerelay;
1661 : :
1662 : : /**
1663 : : * flag for adding 'relay' permission to whitelisted inbound
1664 : : * and manual peers with default permissions.
1665 : : */
1666 : : bool whitelist_relay;
1667 : :
1668 : : /**
1669 : : * Mutex protecting m_i2p_sam_sessions.
1670 : : */
1671 : : Mutex m_unused_i2p_sessions_mutex;
1672 : :
1673 : : /**
1674 : : * A pool of created I2P SAM transient sessions that should be used instead
1675 : : * of creating new ones in order to reduce the load on the I2P network.
1676 : : * Creating a session in I2P is not cheap, thus if this is not empty, then
1677 : : * pick an entry from it instead of creating a new session. If connecting to
1678 : : * a host fails, then the created session is put to this pool for reuse.
1679 : : */
1680 : : std::queue<std::unique_ptr<i2p::sam::Session>> m_unused_i2p_sessions GUARDED_BY(m_unused_i2p_sessions_mutex);
1681 : :
1682 : : /**
1683 : : * Mutex protecting m_reconnections.
1684 : : */
1685 : : Mutex m_reconnections_mutex;
1686 : :
1687 : : /** Struct for entries in m_reconnections. */
1688 : : struct ReconnectionInfo
1689 : : {
1690 : : CAddress addr_connect;
1691 : : CountingSemaphoreGrant<> grant;
1692 : : std::string destination;
1693 : : ConnectionType conn_type;
1694 : : bool use_v2transport;
1695 : : };
1696 : :
1697 : : /**
1698 : : * List of reconnections we have to make.
1699 : : */
1700 : : std::list<ReconnectionInfo> m_reconnections GUARDED_BY(m_reconnections_mutex);
1701 : :
1702 : : /** Attempt reconnections, if m_reconnections non-empty. */
1703 : : void PerformReconnections() EXCLUSIVE_LOCKS_REQUIRED(!m_reconnections_mutex, !m_unused_i2p_sessions_mutex);
1704 : :
1705 : : /**
1706 : : * Cap on the size of `m_unused_i2p_sessions`, to ensure it does not
1707 : : * unexpectedly use too much memory.
1708 : : */
1709 : : static constexpr size_t MAX_UNUSED_I2P_SESSIONS_SIZE{10};
1710 : :
1711 : : /**
1712 : : * RAII helper to atomically create a copy of `m_nodes` and add a reference
1713 : : * to each of the nodes. The nodes are released when this object is destroyed.
1714 : : */
1715 : : class NodesSnapshot
1716 : : {
1717 : : public:
1718 : 0 : explicit NodesSnapshot(const CConnman& connman, bool shuffle)
1719 [ # # ]: 0 : {
1720 : 0 : {
1721 [ # # ]: 0 : LOCK(connman.m_nodes_mutex);
1722 [ # # ]: 0 : m_nodes_copy = connman.m_nodes;
1723 [ # # ]: 0 : for (auto& node : m_nodes_copy) {
1724 : 0 : node->AddRef();
1725 : : }
1726 : 0 : }
1727 [ # # ]: 0 : if (shuffle) {
1728 : 0 : std::shuffle(m_nodes_copy.begin(), m_nodes_copy.end(), FastRandomContext{});
1729 : : }
1730 : 0 : }
1731 : :
1732 : 0 : ~NodesSnapshot()
1733 : : {
1734 [ # # ]: 0 : for (auto& node : m_nodes_copy) {
1735 : 0 : node->Release();
1736 : : }
1737 : 0 : }
1738 : :
1739 : 0 : const std::vector<CNode*>& Nodes() const
1740 : : {
1741 [ # # ]: 0 : return m_nodes_copy;
1742 : : }
1743 : :
1744 : : private:
1745 : : std::vector<CNode*> m_nodes_copy;
1746 : : };
1747 : :
1748 : : const CChainParams& m_params;
1749 : :
1750 : : friend struct ConnmanTestMsg;
1751 : : };
1752 : :
1753 : : /** Defaults to `CaptureMessageToFile()`, but can be overridden by unit tests. */
1754 : : extern std::function<void(const CAddress& addr,
1755 : : const std::string& msg_type,
1756 : : std::span<const unsigned char> data,
1757 : : bool is_incoming)>
1758 : : CaptureMessage;
1759 : :
1760 : : #endif // BITCOIN_NET_H
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