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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_PROTOCOL_H
7 : : #define BITCOIN_PROTOCOL_H
8 : :
9 : : #include <kernel/messagestartchars.h> // IWYU pragma: export
10 : : #include <netaddress.h>
11 : : #include <primitives/transaction.h>
12 : : #include <serialize.h>
13 : : #include <streams.h>
14 : : #include <uint256.h>
15 : : #include <util/time.h>
16 : :
17 : : #include <array>
18 : : #include <cstdint>
19 : : #include <limits>
20 : : #include <string>
21 : :
22 : : /** Message header.
23 : : * (4) message start.
24 : : * (12) command.
25 : : * (4) size.
26 : : * (4) checksum.
27 : : */
28 : : class CMessageHeader
29 : : {
30 : : public:
31 : : static constexpr size_t COMMAND_SIZE = 12;
32 : : static constexpr size_t MESSAGE_SIZE_SIZE = 4;
33 : : static constexpr size_t CHECKSUM_SIZE = 4;
34 : : static constexpr size_t MESSAGE_SIZE_OFFSET = std::tuple_size_v<MessageStartChars> + COMMAND_SIZE;
35 : : static constexpr size_t CHECKSUM_OFFSET = MESSAGE_SIZE_OFFSET + MESSAGE_SIZE_SIZE;
36 : : static constexpr size_t HEADER_SIZE = std::tuple_size_v<MessageStartChars> + COMMAND_SIZE + MESSAGE_SIZE_SIZE + CHECKSUM_SIZE;
37 : :
38 : 115 : explicit CMessageHeader() = default;
39 : :
40 : : /** Construct a P2P message header from message-start characters, a command and the size of the message.
41 : : * @note Passing in a `pszCommand` longer than COMMAND_SIZE will result in a run-time assertion error.
42 : : */
43 : : CMessageHeader(const MessageStartChars& pchMessageStartIn, const char* pszCommand, unsigned int nMessageSizeIn);
44 : :
45 : : std::string GetCommand() const;
46 : : bool IsCommandValid() const;
47 : :
48 : 13 : SERIALIZE_METHODS(CMessageHeader, obj) { READWRITE(obj.pchMessageStart, obj.pchCommand, obj.nMessageSize, obj.pchChecksum); }
49 : :
50 : : MessageStartChars pchMessageStart{};
51 : : char pchCommand[COMMAND_SIZE]{};
52 : : uint32_t nMessageSize{std::numeric_limits<uint32_t>::max()};
53 : : uint8_t pchChecksum[CHECKSUM_SIZE]{};
54 : : };
55 : :
56 : : /**
57 : : * Bitcoin protocol message types. When adding new message types, don't forget
58 : : * to update ALL_NET_MESSAGE_TYPES below.
59 : : */
60 : : namespace NetMsgType {
61 : : /**
62 : : * The version message provides information about the transmitting node to the
63 : : * receiving node at the beginning of a connection.
64 : : */
65 : : inline constexpr const char* VERSION{"version"};
66 : : /**
67 : : * The verack message acknowledges a previously-received version message,
68 : : * informing the connecting node that it can begin to send other messages.
69 : : */
70 : : inline constexpr const char* VERACK{"verack"};
71 : : /**
72 : : * The addr (IP address) message relays connection information for peers on the
73 : : * network.
74 : : */
75 : : inline constexpr const char* ADDR{"addr"};
76 : : /**
77 : : * The addrv2 message relays connection information for peers on the network just
78 : : * like the addr message, but is extended to allow gossiping of longer node
79 : : * addresses (see BIP155).
80 : : */
81 : : inline constexpr const char* ADDRV2{"addrv2"};
82 : : /**
83 : : * The sendaddrv2 message signals support for receiving ADDRV2 messages (BIP155).
84 : : * It also implies that its sender can encode as ADDRV2 and would send ADDRV2
85 : : * instead of ADDR to a peer that has signaled ADDRV2 support by sending SENDADDRV2.
86 : : */
87 : : inline constexpr const char* SENDADDRV2{"sendaddrv2"};
88 : : /**
89 : : * The inv message (inventory message) transmits one or more inventories of
90 : : * objects known to the transmitting peer.
91 : : */
92 : : inline constexpr const char* INV{"inv"};
93 : : /**
94 : : * The getdata message requests one or more data objects from another node.
95 : : */
96 : : inline constexpr const char* GETDATA{"getdata"};
97 : : /**
98 : : * The merkleblock message is a reply to a getdata message which requested a
99 : : * block using the inventory type MSG_MERKLEBLOCK.
100 : : * @since protocol version 70001 as described by BIP37.
101 : : */
102 : : inline constexpr const char* MERKLEBLOCK{"merkleblock"};
103 : : /**
104 : : * The getblocks message requests an inv message that provides block header
105 : : * hashes starting from a particular point in the block chain.
106 : : */
107 : : inline constexpr const char* GETBLOCKS{"getblocks"};
108 : : /**
109 : : * The getheaders message requests a headers message that provides block
110 : : * headers starting from a particular point in the block chain.
111 : : * @since protocol version 31800.
112 : : */
113 : : inline constexpr const char* GETHEADERS{"getheaders"};
114 : : /**
115 : : * The tx message transmits a single transaction.
116 : : */
117 : : inline constexpr const char* TX{"tx"};
118 : : /**
119 : : * The headers message sends one or more block headers to a node which
120 : : * previously requested certain headers with a getheaders message.
121 : : * @since protocol version 31800.
122 : : */
123 : : inline constexpr const char* HEADERS{"headers"};
124 : : /**
125 : : * The block message transmits a single serialized block.
126 : : */
127 : : inline constexpr const char* BLOCK{"block"};
128 : : /**
129 : : * The getaddr message requests an addr message from the receiving node,
130 : : * preferably one with lots of IP addresses of other receiving nodes.
131 : : */
132 : : inline constexpr const char* GETADDR{"getaddr"};
133 : : /**
134 : : * The mempool message requests the TXIDs of transactions that the receiving
135 : : * node has verified as valid but which have not yet appeared in a block.
136 : : * @since protocol version 60002 as described by BIP35.
137 : : * Only available with service bit NODE_BLOOM, see also BIP111.
138 : : */
139 : : inline constexpr const char* MEMPOOL{"mempool"};
140 : : /**
141 : : * The ping message is sent periodically to help confirm that the receiving
142 : : * peer is still connected.
143 : : */
144 : : inline constexpr const char* PING{"ping"};
145 : : /**
146 : : * The pong message replies to a ping message, proving to the pinging node that
147 : : * the ponging node is still alive.
148 : : * @since protocol version 60001 as described by BIP31.
149 : : */
150 : : inline constexpr const char* PONG{"pong"};
151 : : /**
152 : : * The notfound message is a reply to a getdata message which requested an
153 : : * object the receiving node does not have available for relay.
154 : : * @since protocol version 70001.
155 : : */
156 : : inline constexpr const char* NOTFOUND{"notfound"};
157 : : /**
158 : : * The filterload message tells the receiving peer to filter all relayed
159 : : * transactions and requested merkle blocks through the provided filter.
160 : : * @since protocol version 70001 as described by BIP37.
161 : : * Only available with service bit NODE_BLOOM since protocol version
162 : : * 70011 as described by BIP111.
163 : : */
164 : : inline constexpr const char* FILTERLOAD{"filterload"};
165 : : /**
166 : : * The filteradd message tells the receiving peer to add a single element to a
167 : : * previously-set bloom filter, such as a new public key.
168 : : * @since protocol version 70001 as described by BIP37.
169 : : * Only available with service bit NODE_BLOOM since protocol version
170 : : * 70011 as described by BIP111.
171 : : */
172 : : inline constexpr const char* FILTERADD{"filteradd"};
173 : : /**
174 : : * The filterclear message tells the receiving peer to remove a previously-set
175 : : * bloom filter.
176 : : * @since protocol version 70001 as described by BIP37.
177 : : * Only available with service bit NODE_BLOOM since protocol version
178 : : * 70011 as described by BIP111.
179 : : */
180 : : inline constexpr const char* FILTERCLEAR{"filterclear"};
181 : : /**
182 : : * Indicates that a node prefers to receive new block announcements via a
183 : : * "headers" message rather than an "inv".
184 : : * @since protocol version 70012 as described by BIP130.
185 : : */
186 : : inline constexpr const char* SENDHEADERS{"sendheaders"};
187 : : /**
188 : : * The feefilter message tells the receiving peer not to inv us any txs
189 : : * which do not meet the specified min fee rate.
190 : : * @since protocol version 70013 as described by BIP133
191 : : */
192 : : inline constexpr const char* FEEFILTER{"feefilter"};
193 : : /**
194 : : * Contains a 1-byte bool and 8-byte LE version number.
195 : : * Indicates that a node is willing to provide blocks via "cmpctblock" messages.
196 : : * May indicate that a node prefers to receive new block announcements via a
197 : : * "cmpctblock" message rather than an "inv", depending on message contents.
198 : : * @since protocol version 70014 as described by BIP 152
199 : : */
200 : : inline constexpr const char* SENDCMPCT{"sendcmpct"};
201 : : /**
202 : : * Contains a CBlockHeaderAndShortTxIDs object - providing a header and
203 : : * list of "short txids".
204 : : * @since protocol version 70014 as described by BIP 152
205 : : */
206 : : inline constexpr const char* CMPCTBLOCK{"cmpctblock"};
207 : : /**
208 : : * Contains a BlockTransactionsRequest
209 : : * Peer should respond with "blocktxn" message.
210 : : * @since protocol version 70014 as described by BIP 152
211 : : */
212 : : inline constexpr const char* GETBLOCKTXN{"getblocktxn"};
213 : : /**
214 : : * Contains a BlockTransactions.
215 : : * Sent in response to a "getblocktxn" message.
216 : : * @since protocol version 70014 as described by BIP 152
217 : : */
218 : : inline constexpr const char* BLOCKTXN{"blocktxn"};
219 : : /**
220 : : * getcfilters requests compact filters for a range of blocks.
221 : : * Only available with service bit NODE_COMPACT_FILTERS as described by
222 : : * BIP 157 & 158.
223 : : */
224 : : inline constexpr const char* GETCFILTERS{"getcfilters"};
225 : : /**
226 : : * cfilter is a response to a getcfilters request containing a single compact
227 : : * filter.
228 : : */
229 : : inline constexpr const char* CFILTER{"cfilter"};
230 : : /**
231 : : * getcfheaders requests a compact filter header and the filter hashes for a
232 : : * range of blocks, which can then be used to reconstruct the filter headers
233 : : * for those blocks.
234 : : * Only available with service bit NODE_COMPACT_FILTERS as described by
235 : : * BIP 157 & 158.
236 : : */
237 : : inline constexpr const char* GETCFHEADERS{"getcfheaders"};
238 : : /**
239 : : * cfheaders is a response to a getcfheaders request containing a filter header
240 : : * and a vector of filter hashes for each subsequent block in the requested range.
241 : : */
242 : : inline constexpr const char* CFHEADERS{"cfheaders"};
243 : : /**
244 : : * getcfcheckpt requests evenly spaced compact filter headers, enabling
245 : : * parallelized download and validation of the headers between them.
246 : : * Only available with service bit NODE_COMPACT_FILTERS as described by
247 : : * BIP 157 & 158.
248 : : */
249 : : inline constexpr const char* GETCFCHECKPT{"getcfcheckpt"};
250 : : /**
251 : : * cfcheckpt is a response to a getcfcheckpt request containing a vector of
252 : : * evenly spaced filter headers for blocks on the requested chain.
253 : : */
254 : : inline constexpr const char* CFCHECKPT{"cfcheckpt"};
255 : : /**
256 : : * Indicates that a node prefers to relay transactions via wtxid, rather than
257 : : * txid.
258 : : * @since protocol version 70016 as described by BIP 339.
259 : : */
260 : : inline constexpr const char* WTXIDRELAY{"wtxidrelay"};
261 : : /**
262 : : * Contains a 4-byte version number and an 8-byte salt.
263 : : * The salt is used to compute short txids needed for efficient
264 : : * txreconciliation, as described by BIP 330.
265 : : */
266 : : inline constexpr const char* SENDTXRCNCL{"sendtxrcncl"};
267 : : }; // namespace NetMsgType
268 : :
269 : : /** All known message types (see above). Keep this in the same order as the list of messages above. */
270 : : inline const std::array ALL_NET_MESSAGE_TYPES{std::to_array<std::string>({
271 : : NetMsgType::VERSION,
272 : : NetMsgType::VERACK,
273 : : NetMsgType::ADDR,
274 : : NetMsgType::ADDRV2,
275 : : NetMsgType::SENDADDRV2,
276 : : NetMsgType::INV,
277 : : NetMsgType::GETDATA,
278 : : NetMsgType::MERKLEBLOCK,
279 : : NetMsgType::GETBLOCKS,
280 : : NetMsgType::GETHEADERS,
281 : : NetMsgType::TX,
282 : : NetMsgType::HEADERS,
283 : : NetMsgType::BLOCK,
284 : : NetMsgType::GETADDR,
285 : : NetMsgType::MEMPOOL,
286 : : NetMsgType::PING,
287 : : NetMsgType::PONG,
288 : : NetMsgType::NOTFOUND,
289 : : NetMsgType::FILTERLOAD,
290 : : NetMsgType::FILTERADD,
291 : : NetMsgType::FILTERCLEAR,
292 : : NetMsgType::SENDHEADERS,
293 : : NetMsgType::FEEFILTER,
294 : : NetMsgType::SENDCMPCT,
295 : : NetMsgType::CMPCTBLOCK,
296 : : NetMsgType::GETBLOCKTXN,
297 : : NetMsgType::BLOCKTXN,
298 : : NetMsgType::GETCFILTERS,
299 : : NetMsgType::CFILTER,
300 : : NetMsgType::GETCFHEADERS,
301 : : NetMsgType::CFHEADERS,
302 : : NetMsgType::GETCFCHECKPT,
303 : : NetMsgType::CFCHECKPT,
304 : : NetMsgType::WTXIDRELAY,
305 : : NetMsgType::SENDTXRCNCL,
306 : : })};
307 : :
308 : : /** nServices flags */
309 : : enum ServiceFlags : uint64_t {
310 : : // NOTE: When adding here, be sure to update serviceFlagToStr too
311 : : // Nothing
312 : : NODE_NONE = 0,
313 : : // NODE_NETWORK means that the node is capable of serving the complete block chain. It is currently
314 : : // set by all Bitcoin Core non pruned nodes, and is unset by SPV clients or other light clients.
315 : : NODE_NETWORK = (1 << 0),
316 : : // NODE_BLOOM means the node is capable and willing to handle bloom-filtered connections.
317 : : NODE_BLOOM = (1 << 2),
318 : : // NODE_WITNESS indicates that a node can be asked for blocks and transactions including
319 : : // witness data.
320 : : NODE_WITNESS = (1 << 3),
321 : : // NODE_COMPACT_FILTERS means the node will service basic block filter requests.
322 : : // See BIP157 and BIP158 for details on how this is implemented.
323 : : NODE_COMPACT_FILTERS = (1 << 6),
324 : : // NODE_NETWORK_LIMITED means the same as NODE_NETWORK with the limitation of only
325 : : // serving the last 288 (2 day) blocks
326 : : // See BIP159 for details on how this is implemented.
327 : : NODE_NETWORK_LIMITED = (1 << 10),
328 : :
329 : : // NODE_P2P_V2 means the node supports BIP324 transport
330 : : NODE_P2P_V2 = (1 << 11),
331 : :
332 : : // Bits 24-31 are reserved for temporary experiments. Just pick a bit that
333 : : // isn't getting used, or one not being used much, and notify the
334 : : // bitcoin-development mailing list. Remember that service bits are just
335 : : // unauthenticated advertisements, so your code must be robust against
336 : : // collisions and other cases where nodes may be advertising a service they
337 : : // do not actually support. Other service bits should be allocated via the
338 : : // BIP process.
339 : : };
340 : :
341 : : /**
342 : : * Convert service flags (a bitmask of NODE_*) to human readable strings.
343 : : * It supports unknown service flags which will be returned as "UNKNOWN[...]".
344 : : * @param[in] flags multiple NODE_* bitwise-OR-ed together
345 : : */
346 : : std::vector<std::string> serviceFlagsToStr(uint64_t flags);
347 : :
348 : : /**
349 : : * State independent service flags.
350 : : * If the return value is changed, contrib/seeds/makeseeds.py
351 : : * should be updated appropriately to filter for nodes with
352 : : * desired service flags (compatible with our new flags).
353 : : */
354 : : constexpr ServiceFlags SeedsServiceFlags() { return ServiceFlags(NODE_NETWORK | NODE_WITNESS); }
355 : :
356 : : /**
357 : : * Checks if a peer with the given service flags may be capable of having a
358 : : * robust address-storage DB.
359 : : */
360 : 0 : static inline bool MayHaveUsefulAddressDB(ServiceFlags services)
361 : : {
362 [ # # ]: 0 : return (services & NODE_NETWORK) || (services & NODE_NETWORK_LIMITED);
363 : : }
364 : :
365 : : /** A CService with information about it as peer */
366 [ - - - - : 21762 : class CAddress : public CService
- - - - -
- ][ + - +
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# # # # #
# ][ - + -
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# # # # #
# # # # #
# # ]
367 : : {
368 : : static constexpr std::chrono::seconds TIME_INIT{100000000};
369 : :
370 : : /** Historically, CAddress disk serialization stored the CLIENT_VERSION, optionally OR'ed with
371 : : * the ADDRV2_FORMAT flag to indicate V2 serialization. The first field has since been
372 : : * disentangled from client versioning, and now instead:
373 : : * - The low bits (masked by DISK_VERSION_IGNORE_MASK) store the fixed value DISK_VERSION_INIT,
374 : : * (in case any code exists that treats it as a client version) but are ignored on
375 : : * deserialization.
376 : : * - The high bits (masked by ~DISK_VERSION_IGNORE_MASK) store actual serialization information.
377 : : * Only 0 or DISK_VERSION_ADDRV2 (equal to the historical ADDRV2_FORMAT) are valid now, and
378 : : * any other value triggers a deserialization failure. Other values can be added later if
379 : : * needed.
380 : : *
381 : : * For disk deserialization, ADDRV2_FORMAT in the stream version signals that ADDRV2
382 : : * deserialization is permitted, but the actual format is determined by the high bits in the
383 : : * stored version field. For network serialization, the stream version having ADDRV2_FORMAT or
384 : : * not determines the actual format used (as it has no embedded version number).
385 : : */
386 : : static constexpr uint32_t DISK_VERSION_INIT{220000};
387 : : static constexpr uint32_t DISK_VERSION_IGNORE_MASK{0b00000000'00000111'11111111'11111111};
388 : : /** The version number written in disk serialized addresses to indicate V2 serializations.
389 : : * It must be exactly 1<<29, as that is the value that historical versions used for this
390 : : * (they used their internal ADDRV2_FORMAT flag here). */
391 : : static constexpr uint32_t DISK_VERSION_ADDRV2{1 << 29};
392 : : static_assert((DISK_VERSION_INIT & ~DISK_VERSION_IGNORE_MASK) == 0, "DISK_VERSION_INIT must be covered by DISK_VERSION_IGNORE_MASK");
393 : : static_assert((DISK_VERSION_ADDRV2 & DISK_VERSION_IGNORE_MASK) == 0, "DISK_VERSION_ADDRV2 must not be covered by DISK_VERSION_IGNORE_MASK");
394 : :
395 : : public:
396 [ + - # # : 2412 : CAddress() : CService{} {};
# # # # #
# # # # #
# # # # #
# # # # #
# # ]
[ # # # # ]
[ + - + -
+ - + - +
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- ]
397 : 6702 : CAddress(CService ipIn, ServiceFlags nServicesIn) : CService{ipIn}, nServices{nServicesIn} {};
398 : 1 : CAddress(CService ipIn, ServiceFlags nServicesIn, NodeSeconds time) : CService{ipIn}, nTime{time}, nServices{nServicesIn} {};
399 : :
400 : : enum class Format {
401 : : Disk,
402 : : Network,
403 : : };
404 : : struct SerParams : CNetAddr::SerParams {
405 : : const Format fmt;
406 [ # # # # ]: 39 : SER_PARAMS_OPFUNC
[ - - + -
- - ][ + -
+ - + - +
- ][ + - #
# # # # #
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- ]
407 : : };
408 : : static constexpr SerParams V1_NETWORK{{CNetAddr::Encoding::V1}, Format::Network};
409 : : static constexpr SerParams V2_NETWORK{{CNetAddr::Encoding::V2}, Format::Network};
410 : : static constexpr SerParams V1_DISK{{CNetAddr::Encoding::V1}, Format::Disk};
411 : : static constexpr SerParams V2_DISK{{CNetAddr::Encoding::V2}, Format::Disk};
412 : :
413 [ + + ]: 100 : SERIALIZE_METHODS(CAddress, obj)
414 : : {
415 : : bool use_v2;
416 : 50 : auto& params = SER_PARAMS(SerParams);
417 [ + + ]: 50 : if (params.fmt == Format::Disk) {
418 : : // In the disk serialization format, the encoding (v1 or v2) is determined by a flag version
419 : : // that's part of the serialization itself. ADDRV2_FORMAT in the stream version only determines
420 : : // whether V2 is chosen/permitted at all.
421 : 17 : uint32_t stored_format_version = DISK_VERSION_INIT;
422 [ + + ]: 36 : if (params.enc == Encoding::V2) stored_format_version |= DISK_VERSION_ADDRV2;
423 : 34 : READWRITE(stored_format_version);
424 : 34 : stored_format_version &= ~DISK_VERSION_IGNORE_MASK; // ignore low bits
425 [ + + ]: 34 : if (stored_format_version == 0) {
426 : : use_v2 = false;
427 [ + - - + ]: 30 : } else if (stored_format_version == DISK_VERSION_ADDRV2 && params.enc == Encoding::V2) {
428 : : // Only support v2 deserialization if V2 is set.
429 : : use_v2 = true;
430 : : } else {
431 [ # # ]: 0 : throw std::ios_base::failure("Unsupported CAddress disk format version");
432 : : }
433 : : } else {
434 [ - + ]: 14 : assert(params.fmt == Format::Network);
435 : : // In the network serialization format, the encoding (v1 or v2) is determined directly by
436 : : // the value of enc in the stream params, as no explicitly encoded version
437 : : // exists in the stream.
438 : 14 : use_v2 = params.enc == Encoding::V2;
439 : : }
440 : :
441 : 48 : READWRITE(Using<LossyChronoFormatter<uint32_t>>(obj.nTime));
442 : : // nServices is serialized as CompactSize in V2; as uint64_t in V1.
443 [ + + ]: 48 : if (use_v2) {
444 : : uint64_t services_tmp;
445 : 36 : SER_WRITE(obj, services_tmp = obj.nServices);
446 : 36 : READWRITE(Using<CompactSizeFormatter<false>>(services_tmp));
447 : 36 : SER_READ(obj, obj.nServices = static_cast<ServiceFlags>(services_tmp));
448 : : } else {
449 : 12 : READWRITE(Using<CustomUintFormatter<8>>(obj.nServices));
450 : : }
451 : : // Invoke V1/V2 serializer for CService parent object.
452 [ + + ]: 48 : const auto ser_params{use_v2 ? CNetAddr::V2 : CNetAddr::V1};
453 : 48 : READWRITE(ser_params(AsBase<CService>(obj)));
454 : 48 : }
455 : :
456 : : //! Always included in serialization. The behavior is unspecified if the value is not representable as uint32_t.
457 : : NodeSeconds nTime{TIME_INIT};
458 : : //! Serialized as uint64_t in V1, and as CompactSize in V2.
459 : : ServiceFlags nServices{NODE_NONE};
460 : :
461 : 15 : friend bool operator==(const CAddress& a, const CAddress& b)
462 : : {
463 : 30 : return a.nTime == b.nTime &&
464 [ + - + - : 30 : a.nServices == b.nServices &&
+ + ]
465 : 15 : static_cast<const CService&>(a) == static_cast<const CService&>(b);
466 : : }
467 : : };
468 : :
469 : : /** getdata message type flags */
470 : : const uint32_t MSG_WITNESS_FLAG = 1 << 30;
471 : : const uint32_t MSG_TYPE_MASK = 0xffffffff >> 2;
472 : :
473 : : /** getdata / inv message types.
474 : : * These numbers are defined by the protocol. When adding a new value, be sure
475 : : * to mention it in the respective BIP.
476 : : */
477 : : enum GetDataMsg : uint32_t {
478 : : UNDEFINED = 0,
479 : : MSG_TX = 1,
480 : : MSG_BLOCK = 2,
481 : : MSG_WTX = 5, //!< Defined in BIP 339
482 : : // The following can only occur in getdata. Invs always use TX/WTX or BLOCK.
483 : : MSG_FILTERED_BLOCK = 3, //!< Defined in BIP37
484 : : MSG_CMPCT_BLOCK = 4, //!< Defined in BIP152
485 : : MSG_WITNESS_BLOCK = MSG_BLOCK | MSG_WITNESS_FLAG, //!< Defined in BIP144
486 : : MSG_WITNESS_TX = MSG_TX | MSG_WITNESS_FLAG, //!< Defined in BIP144
487 : : // MSG_FILTERED_WITNESS_BLOCK is defined in BIP144 as reserved for future
488 : : // use and remains unused.
489 : : // MSG_FILTERED_WITNESS_BLOCK = MSG_FILTERED_BLOCK | MSG_WITNESS_FLAG,
490 : : };
491 : :
492 : : /** inv message data */
493 : : class CInv
494 : : {
495 : : public:
496 : : CInv();
497 : : CInv(uint32_t typeIn, const uint256& hashIn);
498 : :
499 : 0 : SERIALIZE_METHODS(CInv, obj) { READWRITE(obj.type, obj.hash); }
500 : :
501 : : friend bool operator<(const CInv& a, const CInv& b);
502 : :
503 : : std::string GetCommand() const;
504 : : std::string ToString() const;
505 : :
506 : : // Single-message helper methods
507 [ # # # # ]: 0 : bool IsMsgTx() const { return type == MSG_TX; }
508 [ # # # # ]: 0 : bool IsMsgBlk() const { return type == MSG_BLOCK; }
509 [ # # ]: 0 : bool IsMsgWtx() const { return type == MSG_WTX; }
510 [ # # ]: 0 : bool IsMsgFilteredBlk() const { return type == MSG_FILTERED_BLOCK; }
511 : : bool IsMsgCmpctBlk() const { return type == MSG_CMPCT_BLOCK; }
512 [ # # ]: 0 : bool IsMsgWitnessBlk() const { return type == MSG_WITNESS_BLOCK; }
513 : :
514 : : // Combined-message helper methods
515 : 0 : bool IsGenTxMsg() const
516 : : {
517 [ # # # # ]: 0 : return type == MSG_TX || type == MSG_WTX || type == MSG_WITNESS_TX;
[ # # # #
# # # # #
# # # ]
518 : : }
519 : 0 : bool IsGenBlkMsg() const
520 : : {
521 [ # # ]: 0 : return type == MSG_BLOCK || type == MSG_FILTERED_BLOCK || type == MSG_CMPCT_BLOCK || type == MSG_WITNESS_BLOCK;
522 : : }
523 : :
524 : : uint32_t type;
525 : : uint256 hash;
526 : : };
527 : :
528 : : /** Convert a TX/WITNESS_TX/WTX CInv to a GenTxid. */
529 : : GenTxid ToGenTxid(const CInv& inv);
530 : :
531 : : #endif // BITCOIN_PROTOCOL_H
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