LCOV - code coverage report
Current view: top level - src - protocol.h (source / functions) Hit Total Coverage
Test: fuzz_coverage.info Lines: 35 57 61.4 %
Date: 2023-11-06 23:13:05 Functions: 21 73 28.8 %
Branches: 8 116 6.9 %

           Branch data     Line data    Source code
       1                 :            : // Copyright (c) 2009-2010 Satoshi Nakamoto
       2                 :            : // Copyright (c) 2009-2022 The Bitcoin Core developers
       3                 :            : // Distributed under the MIT software license, see the accompanying
       4                 :            : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       5                 :            : 
       6                 :            : #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                 :      12346 :     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                 :      36090 :     SERIALIZE_METHODS(CMessageHeader, obj) { READWRITE(obj.pchMessageStart, obj.pchCommand, obj.nMessageSize, obj.pchChecksum); }
      49                 :            : 
      50                 :       6173 :     MessageStartChars pchMessageStart{};
      51                 :       6173 :     char pchCommand[COMMAND_SIZE]{};
      52                 :       6173 :     uint32_t nMessageSize{std::numeric_limits<uint32_t>::max()};
      53                 :       6173 :     uint8_t pchChecksum[CHECKSUM_SIZE]{};
      54                 :            : };
      55                 :            : 
      56                 :            : /**
      57                 :            :  * Bitcoin protocol message types. When adding new message types, don't forget
      58                 :            :  * to update allNetMessageTypes in protocol.cpp.
      59                 :            :  */
      60                 :            : namespace NetMsgType {
      61                 :            : 
      62                 :            : /**
      63                 :            :  * The version message provides information about the transmitting node to the
      64                 :            :  * receiving node at the beginning of a connection.
      65                 :            :  */
      66                 :            : extern const char* VERSION;
      67                 :            : /**
      68                 :            :  * The verack message acknowledges a previously-received version message,
      69                 :            :  * informing the connecting node that it can begin to send other messages.
      70                 :            :  */
      71                 :            : extern const char* VERACK;
      72                 :            : /**
      73                 :            :  * The addr (IP address) message relays connection information for peers on the
      74                 :            :  * network.
      75                 :            :  */
      76                 :            : extern const char* ADDR;
      77                 :            : /**
      78                 :            :  * The addrv2 message relays connection information for peers on the network just
      79                 :            :  * like the addr message, but is extended to allow gossiping of longer node
      80                 :            :  * addresses (see BIP155).
      81                 :            :  */
      82                 :            : extern const char *ADDRV2;
      83                 :            : /**
      84                 :            :  * The sendaddrv2 message signals support for receiving ADDRV2 messages (BIP155).
      85                 :            :  * It also implies that its sender can encode as ADDRV2 and would send ADDRV2
      86                 :            :  * instead of ADDR to a peer that has signaled ADDRV2 support by sending SENDADDRV2.
      87                 :            :  */
      88                 :            : extern const char *SENDADDRV2;
      89                 :            : /**
      90                 :            :  * The inv message (inventory message) transmits one or more inventories of
      91                 :            :  * objects known to the transmitting peer.
      92                 :            :  */
      93                 :            : extern const char* INV;
      94                 :            : /**
      95                 :            :  * The getdata message requests one or more data objects from another node.
      96                 :            :  */
      97                 :            : extern const char* GETDATA;
      98                 :            : /**
      99                 :            :  * The merkleblock message is a reply to a getdata message which requested a
     100                 :            :  * block using the inventory type MSG_MERKLEBLOCK.
     101                 :            :  * @since protocol version 70001 as described by BIP37.
     102                 :            :  */
     103                 :            : extern const char* MERKLEBLOCK;
     104                 :            : /**
     105                 :            :  * The getblocks message requests an inv message that provides block header
     106                 :            :  * hashes starting from a particular point in the block chain.
     107                 :            :  */
     108                 :            : extern const char* GETBLOCKS;
     109                 :            : /**
     110                 :            :  * The getheaders message requests a headers message that provides block
     111                 :            :  * headers starting from a particular point in the block chain.
     112                 :            :  * @since protocol version 31800.
     113                 :            :  */
     114                 :            : extern const char* GETHEADERS;
     115                 :            : /**
     116                 :            :  * The tx message transmits a single transaction.
     117                 :            :  */
     118                 :            : extern const char* TX;
     119                 :            : /**
     120                 :            :  * The headers message sends one or more block headers to a node which
     121                 :            :  * previously requested certain headers with a getheaders message.
     122                 :            :  * @since protocol version 31800.
     123                 :            :  */
     124                 :            : extern const char* HEADERS;
     125                 :            : /**
     126                 :            :  * The block message transmits a single serialized block.
     127                 :            :  */
     128                 :            : extern const char* BLOCK;
     129                 :            : /**
     130                 :            :  * The getaddr message requests an addr message from the receiving node,
     131                 :            :  * preferably one with lots of IP addresses of other receiving nodes.
     132                 :            :  */
     133                 :            : extern const char* GETADDR;
     134                 :            : /**
     135                 :            :  * The mempool message requests the TXIDs of transactions that the receiving
     136                 :            :  * node has verified as valid but which have not yet appeared in a block.
     137                 :            :  * @since protocol version 60002 as described by BIP35.
     138                 :            :  *   Only available with service bit NODE_BLOOM, see also BIP111.
     139                 :            :  */
     140                 :            : extern const char* MEMPOOL;
     141                 :            : /**
     142                 :            :  * The ping message is sent periodically to help confirm that the receiving
     143                 :            :  * peer is still connected.
     144                 :            :  */
     145                 :            : extern const char* PING;
     146                 :            : /**
     147                 :            :  * The pong message replies to a ping message, proving to the pinging node that
     148                 :            :  * the ponging node is still alive.
     149                 :            :  * @since protocol version 60001 as described by BIP31.
     150                 :            :  */
     151                 :            : extern const char* PONG;
     152                 :            : /**
     153                 :            :  * The notfound message is a reply to a getdata message which requested an
     154                 :            :  * object the receiving node does not have available for relay.
     155                 :            :  * @since protocol version 70001.
     156                 :            :  */
     157                 :            : extern const char* NOTFOUND;
     158                 :            : /**
     159                 :            :  * The filterload message tells the receiving peer to filter all relayed
     160                 :            :  * transactions and requested merkle blocks through the provided filter.
     161                 :            :  * @since protocol version 70001 as described by BIP37.
     162                 :            :  *   Only available with service bit NODE_BLOOM since protocol version
     163                 :            :  *   70011 as described by BIP111.
     164                 :            :  */
     165                 :            : extern const char* FILTERLOAD;
     166                 :            : /**
     167                 :            :  * The filteradd message tells the receiving peer to add a single element to a
     168                 :            :  * previously-set bloom filter, such as a new public key.
     169                 :            :  * @since protocol version 70001 as described by BIP37.
     170                 :            :  *   Only available with service bit NODE_BLOOM since protocol version
     171                 :            :  *   70011 as described by BIP111.
     172                 :            :  */
     173                 :            : extern const char* FILTERADD;
     174                 :            : /**
     175                 :            :  * The filterclear message tells the receiving peer to remove a previously-set
     176                 :            :  * bloom filter.
     177                 :            :  * @since protocol version 70001 as described by BIP37.
     178                 :            :  *   Only available with service bit NODE_BLOOM since protocol version
     179                 :            :  *   70011 as described by BIP111.
     180                 :            :  */
     181                 :            : extern const char* FILTERCLEAR;
     182                 :            : /**
     183                 :            :  * Indicates that a node prefers to receive new block announcements via a
     184                 :            :  * "headers" message rather than an "inv".
     185                 :            :  * @since protocol version 70012 as described by BIP130.
     186                 :            :  */
     187                 :            : extern const char* SENDHEADERS;
     188                 :            : /**
     189                 :            :  * The feefilter message tells the receiving peer not to inv us any txs
     190                 :            :  * which do not meet the specified min fee rate.
     191                 :            :  * @since protocol version 70013 as described by BIP133
     192                 :            :  */
     193                 :            : extern const char* FEEFILTER;
     194                 :            : /**
     195                 :            :  * Contains a 1-byte bool and 8-byte LE version number.
     196                 :            :  * Indicates that a node is willing to provide blocks via "cmpctblock" messages.
     197                 :            :  * May indicate that a node prefers to receive new block announcements via a
     198                 :            :  * "cmpctblock" message rather than an "inv", depending on message contents.
     199                 :            :  * @since protocol version 70014 as described by BIP 152
     200                 :            :  */
     201                 :            : extern const char* SENDCMPCT;
     202                 :            : /**
     203                 :            :  * Contains a CBlockHeaderAndShortTxIDs object - providing a header and
     204                 :            :  * list of "short txids".
     205                 :            :  * @since protocol version 70014 as described by BIP 152
     206                 :            :  */
     207                 :            : extern const char* CMPCTBLOCK;
     208                 :            : /**
     209                 :            :  * Contains a BlockTransactionsRequest
     210                 :            :  * Peer should respond with "blocktxn" message.
     211                 :            :  * @since protocol version 70014 as described by BIP 152
     212                 :            :  */
     213                 :            : extern const char* GETBLOCKTXN;
     214                 :            : /**
     215                 :            :  * Contains a BlockTransactions.
     216                 :            :  * Sent in response to a "getblocktxn" message.
     217                 :            :  * @since protocol version 70014 as described by BIP 152
     218                 :            :  */
     219                 :            : extern const char* BLOCKTXN;
     220                 :            : /**
     221                 :            :  * getcfilters requests compact filters for a range of blocks.
     222                 :            :  * Only available with service bit NODE_COMPACT_FILTERS as described by
     223                 :            :  * BIP 157 & 158.
     224                 :            :  */
     225                 :            : extern const char* GETCFILTERS;
     226                 :            : /**
     227                 :            :  * cfilter is a response to a getcfilters request containing a single compact
     228                 :            :  * filter.
     229                 :            :  */
     230                 :            : extern const char* CFILTER;
     231                 :            : /**
     232                 :            :  * getcfheaders requests a compact filter header and the filter hashes for a
     233                 :            :  * range of blocks, which can then be used to reconstruct the filter headers
     234                 :            :  * for those blocks.
     235                 :            :  * Only available with service bit NODE_COMPACT_FILTERS as described by
     236                 :            :  * BIP 157 & 158.
     237                 :            :  */
     238                 :            : extern const char* GETCFHEADERS;
     239                 :            : /**
     240                 :            :  * cfheaders is a response to a getcfheaders request containing a filter header
     241                 :            :  * and a vector of filter hashes for each subsequent block in the requested range.
     242                 :            :  */
     243                 :            : extern const char* CFHEADERS;
     244                 :            : /**
     245                 :            :  * getcfcheckpt requests evenly spaced compact filter headers, enabling
     246                 :            :  * parallelized download and validation of the headers between them.
     247                 :            :  * Only available with service bit NODE_COMPACT_FILTERS as described by
     248                 :            :  * BIP 157 & 158.
     249                 :            :  */
     250                 :            : extern const char* GETCFCHECKPT;
     251                 :            : /**
     252                 :            :  * cfcheckpt is a response to a getcfcheckpt request containing a vector of
     253                 :            :  * evenly spaced filter headers for blocks on the requested chain.
     254                 :            :  */
     255                 :            : extern const char* CFCHECKPT;
     256                 :            : /**
     257                 :            :  * Indicates that a node prefers to relay transactions via wtxid, rather than
     258                 :            :  * txid.
     259                 :            :  * @since protocol version 70016 as described by BIP 339.
     260                 :            :  */
     261                 :            : extern const char* WTXIDRELAY;
     262                 :            : /**
     263                 :            :  * Contains a 4-byte version number and an 8-byte salt.
     264                 :            :  * The salt is used to compute short txids needed for efficient
     265                 :            :  * txreconciliation, as described by BIP 330.
     266                 :            :  */
     267                 :            : extern const char* SENDTXRCNCL;
     268                 :            : }; // namespace NetMsgType
     269                 :            : 
     270                 :            : /* Get a vector of all valid message types (see above) */
     271                 :            : const std::vector<std::string>& getAllNetMessageTypes();
     272                 :            : 
     273                 :            : /** nServices flags */
     274                 :            : enum ServiceFlags : uint64_t {
     275                 :            :     // NOTE: When adding here, be sure to update serviceFlagToStr too
     276                 :            :     // Nothing
     277                 :            :     NODE_NONE = 0,
     278                 :            :     // NODE_NETWORK means that the node is capable of serving the complete block chain. It is currently
     279                 :            :     // set by all Bitcoin Core non pruned nodes, and is unset by SPV clients or other light clients.
     280                 :            :     NODE_NETWORK = (1 << 0),
     281                 :            :     // NODE_BLOOM means the node is capable and willing to handle bloom-filtered connections.
     282                 :            :     NODE_BLOOM = (1 << 2),
     283                 :            :     // NODE_WITNESS indicates that a node can be asked for blocks and transactions including
     284                 :            :     // witness data.
     285                 :            :     NODE_WITNESS = (1 << 3),
     286                 :            :     // NODE_COMPACT_FILTERS means the node will service basic block filter requests.
     287                 :            :     // See BIP157 and BIP158 for details on how this is implemented.
     288                 :            :     NODE_COMPACT_FILTERS = (1 << 6),
     289                 :            :     // NODE_NETWORK_LIMITED means the same as NODE_NETWORK with the limitation of only
     290                 :            :     // serving the last 288 (2 day) blocks
     291                 :            :     // See BIP159 for details on how this is implemented.
     292                 :            :     NODE_NETWORK_LIMITED = (1 << 10),
     293                 :            : 
     294                 :            :     // NODE_P2P_V2 means the node supports BIP324 transport
     295                 :            :     NODE_P2P_V2 = (1 << 11),
     296                 :            : 
     297                 :            :     // Bits 24-31 are reserved for temporary experiments. Just pick a bit that
     298                 :            :     // isn't getting used, or one not being used much, and notify the
     299                 :            :     // bitcoin-development mailing list. Remember that service bits are just
     300                 :            :     // unauthenticated advertisements, so your code must be robust against
     301                 :            :     // collisions and other cases where nodes may be advertising a service they
     302                 :            :     // do not actually support. Other service bits should be allocated via the
     303                 :            :     // BIP process.
     304                 :            : };
     305                 :            : 
     306                 :            : /**
     307                 :            :  * Convert service flags (a bitmask of NODE_*) to human readable strings.
     308                 :            :  * It supports unknown service flags which will be returned as "UNKNOWN[...]".
     309                 :            :  * @param[in] flags multiple NODE_* bitwise-OR-ed together
     310                 :            :  */
     311                 :            : std::vector<std::string> serviceFlagsToStr(uint64_t flags);
     312                 :            : 
     313                 :            : /**
     314                 :            :  * Gets the set of service flags which are "desirable" for a given peer.
     315                 :            :  *
     316                 :            :  * These are the flags which are required for a peer to support for them
     317                 :            :  * to be "interesting" to us, ie for us to wish to use one of our few
     318                 :            :  * outbound connection slots for or for us to wish to prioritize keeping
     319                 :            :  * their connection around.
     320                 :            :  *
     321                 :            :  * Relevant service flags may be peer- and state-specific in that the
     322                 :            :  * version of the peer may determine which flags are required (eg in the
     323                 :            :  * case of NODE_NETWORK_LIMITED where we seek out NODE_NETWORK peers
     324                 :            :  * unless they set NODE_NETWORK_LIMITED and we are out of IBD, in which
     325                 :            :  * case NODE_NETWORK_LIMITED suffices).
     326                 :            :  *
     327                 :            :  * Thus, generally, avoid calling with peerServices == NODE_NONE, unless
     328                 :            :  * state-specific flags must absolutely be avoided. When called with
     329                 :            :  * peerServices == NODE_NONE, the returned desirable service flags are
     330                 :            :  * guaranteed to not change dependent on state - ie they are suitable for
     331                 :            :  * use when describing peers which we know to be desirable, but for which
     332                 :            :  * we do not have a confirmed set of service flags.
     333                 :            :  *
     334                 :            :  * If the NODE_NONE return value is changed, contrib/seeds/makeseeds.py
     335                 :            :  * should be updated appropriately to filter for the same nodes.
     336                 :            :  */
     337                 :            : ServiceFlags GetDesirableServiceFlags(ServiceFlags services);
     338                 :            : 
     339                 :            : /** Set the current IBD status in order to figure out the desirable service flags */
     340                 :            : void SetServiceFlagsIBDCache(bool status);
     341                 :            : 
     342                 :            : /**
     343                 :            :  * A shortcut for (services & GetDesirableServiceFlags(services))
     344                 :            :  * == GetDesirableServiceFlags(services), ie determines whether the given
     345                 :            :  * set of service flags are sufficient for a peer to be "relevant".
     346                 :            :  */
     347                 :         30 : static inline bool HasAllDesirableServiceFlags(ServiceFlags services)
     348                 :            : {
     349                 :         30 :     return !(GetDesirableServiceFlags(services) & (~services));
     350                 :            : }
     351                 :            : 
     352                 :            : /**
     353                 :            :  * Checks if a peer with the given service flags may be capable of having a
     354                 :            :  * robust address-storage DB.
     355                 :            :  */
     356                 :          1 : static inline bool MayHaveUsefulAddressDB(ServiceFlags services)
     357                 :            : {
     358         [ +  - ]:          1 :     return (services & NODE_NETWORK) || (services & NODE_NETWORK_LIMITED);
     359                 :            : }
     360                 :            : 
     361                 :            : /** A CService with information about it as peer */
     362                 :          0 : class CAddress : public CService
     363                 :            : {
     364                 :            :     static constexpr std::chrono::seconds TIME_INIT{100000000};
     365                 :            : 
     366                 :            :     /** Historically, CAddress disk serialization stored the CLIENT_VERSION, optionally OR'ed with
     367                 :            :      *  the ADDRV2_FORMAT flag to indicate V2 serialization. The first field has since been
     368                 :            :      *  disentangled from client versioning, and now instead:
     369                 :            :      *  - The low bits (masked by DISK_VERSION_IGNORE_MASK) store the fixed value DISK_VERSION_INIT,
     370                 :            :      *    (in case any code exists that treats it as a client version) but are ignored on
     371                 :            :      *    deserialization.
     372                 :            :      *  - The high bits (masked by ~DISK_VERSION_IGNORE_MASK) store actual serialization information.
     373                 :            :      *    Only 0 or DISK_VERSION_ADDRV2 (equal to the historical ADDRV2_FORMAT) are valid now, and
     374                 :            :      *    any other value triggers a deserialization failure. Other values can be added later if
     375                 :            :      *    needed.
     376                 :            :      *
     377                 :            :      *  For disk deserialization, ADDRV2_FORMAT in the stream version signals that ADDRV2
     378                 :            :      *  deserialization is permitted, but the actual format is determined by the high bits in the
     379                 :            :      *  stored version field. For network serialization, the stream version having ADDRV2_FORMAT or
     380                 :            :      *  not determines the actual format used (as it has no embedded version number).
     381                 :            :      */
     382                 :            :     static constexpr uint32_t DISK_VERSION_INIT{220000};
     383                 :            :     static constexpr uint32_t DISK_VERSION_IGNORE_MASK{0b00000000'00000111'11111111'11111111};
     384                 :            :     /** The version number written in disk serialized addresses to indicate V2 serializations.
     385                 :            :      * It must be exactly 1<<29, as that is the value that historical versions used for this
     386                 :            :      * (they used their internal ADDRV2_FORMAT flag here). */
     387                 :            :     static constexpr uint32_t DISK_VERSION_ADDRV2{1 << 29};
     388                 :            :     static_assert((DISK_VERSION_INIT & ~DISK_VERSION_IGNORE_MASK) == 0, "DISK_VERSION_INIT must be covered by DISK_VERSION_IGNORE_MASK");
     389                 :            :     static_assert((DISK_VERSION_ADDRV2 & DISK_VERSION_IGNORE_MASK) == 0, "DISK_VERSION_ADDRV2 must not be covered by DISK_VERSION_IGNORE_MASK");
     390                 :            : 
     391                 :            : public:
     392                 :        450 :     CAddress() : CService{} {};
     393                 :        145 :     CAddress(CService ipIn, ServiceFlags nServicesIn) : CService{ipIn}, nServices{nServicesIn} {};
     394                 :          0 :     CAddress(CService ipIn, ServiceFlags nServicesIn, NodeSeconds time) : CService{ipIn}, nTime{time}, nServices{nServicesIn} {};
     395                 :            : 
     396                 :            :     enum class Format {
     397                 :            :         Disk,
     398                 :            :         Network,
     399                 :            :     };
     400                 :            :     struct SerParams : CNetAddr::SerParams {
     401                 :            :         const Format fmt;
     402                 :          2 :         SER_PARAMS_OPFUNC
     403                 :            :     };
     404                 :            :     static constexpr SerParams V1_NETWORK{{CNetAddr::Encoding::V1}, Format::Network};
     405                 :            :     static constexpr SerParams V2_NETWORK{{CNetAddr::Encoding::V2}, Format::Network};
     406                 :            :     static constexpr SerParams V1_DISK{{CNetAddr::Encoding::V1}, Format::Disk};
     407                 :            :     static constexpr SerParams V2_DISK{{CNetAddr::Encoding::V2}, Format::Disk};
     408                 :            : 
     409                 :          3 :     SERIALIZE_METHODS_PARAMS(CAddress, obj, SerParams, params)
     410                 :            :     {
     411                 :            :         bool use_v2;
     412 [ -  + ][ #  # ]:          1 :         if (params.fmt == Format::Disk) {
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     413                 :            :             // In the disk serialization format, the encoding (v1 or v2) is determined by a flag version
     414                 :            :             // that's part of the serialization itself. ADDRV2_FORMAT in the stream version only determines
     415                 :            :             // whether V2 is chosen/permitted at all.
     416                 :          1 :             uint32_t stored_format_version = DISK_VERSION_INIT;
     417 [ -  + ][ #  # ]:          1 :             if (params.enc == Encoding::V2) stored_format_version |= DISK_VERSION_ADDRV2;
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     418                 :          1 :             READWRITE(stored_format_version);
     419                 :          1 :             stored_format_version &= ~DISK_VERSION_IGNORE_MASK; // ignore low bits
     420 [ +  - ][ #  # ]:          1 :             if (stored_format_version == 0) {
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     421                 :          0 :                 use_v2 = false;
     422 [ +  - ][ #  # ]:          1 :             } else if (stored_format_version == DISK_VERSION_ADDRV2 && params.enc == Encoding::V2) {
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     423                 :            :                 // Only support v2 deserialization if V2 is set.
     424                 :          1 :                 use_v2 = true;
     425                 :          1 :             } else {
     426 [ #  # ][ #  # ]:          0 :                 throw std::ios_base::failure("Unsupported CAddress disk format version");
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     427                 :            :             }
     428                 :          1 :         } else {
     429 [ #  # ][ #  # ]:          0 :             assert(params.fmt == Format::Network);
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     430                 :            :             // In the network serialization format, the encoding (v1 or v2) is determined directly by
     431                 :            :             // the value of enc in the stream params, as no explicitly encoded version
     432                 :            :             // exists in the stream.
     433                 :          0 :             use_v2 = params.enc == Encoding::V2;
     434                 :            :         }
     435                 :            : 
     436                 :          1 :         READWRITE(Using<LossyChronoFormatter<uint32_t>>(obj.nTime));
     437                 :            :         // nServices is serialized as CompactSize in V2; as uint64_t in V1.
     438 [ +  - ][ #  # ]:          1 :         if (use_v2) {
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     439                 :            :             uint64_t services_tmp;
     440                 :          2 :             SER_WRITE(obj, services_tmp = obj.nServices);
     441                 :          1 :             READWRITE(Using<CompactSizeFormatter<false>>(services_tmp));
     442                 :          1 :             SER_READ(obj, obj.nServices = static_cast<ServiceFlags>(services_tmp));
     443                 :          1 :         } else {
     444                 :          0 :             READWRITE(Using<CustomUintFormatter<8>>(obj.nServices));
     445                 :            :         }
     446                 :            :         // Invoke V1/V2 serializer for CService parent object.
     447 [ +  - ][ #  # ]:          1 :         const auto ser_params{use_v2 ? CNetAddr::V2 : CNetAddr::V1};
         [ #  # ][ #  # ]
         [ #  # ][ #  # ]
     448                 :          1 :         READWRITE(WithParams(ser_params, AsBase<CService>(obj)));
     449                 :          1 :     }
     450                 :            : 
     451                 :            :     //! Always included in serialization. The behavior is unspecified if the value is not representable as uint32_t.
     452 [ +  - ][ #  # ]:        595 :     NodeSeconds nTime{TIME_INIT};
     453                 :            :     //! Serialized as uint64_t in V1, and as CompactSize in V2.
     454                 :        450 :     ServiceFlags nServices{NODE_NONE};
     455                 :            : 
     456                 :          0 :     friend bool operator==(const CAddress& a, const CAddress& b)
     457                 :            :     {
     458         [ #  # ]:          0 :         return a.nTime == b.nTime &&
     459         [ #  # ]:          0 :                a.nServices == b.nServices &&
     460                 :          0 :                static_cast<const CService&>(a) == static_cast<const CService&>(b);
     461                 :            :     }
     462                 :            : };
     463                 :            : 
     464                 :            : /** getdata message type flags */
     465                 :            : const uint32_t MSG_WITNESS_FLAG = 1 << 30;
     466                 :            : const uint32_t MSG_TYPE_MASK = 0xffffffff >> 2;
     467                 :            : 
     468                 :            : /** getdata / inv message types.
     469                 :            :  * These numbers are defined by the protocol. When adding a new value, be sure
     470                 :            :  * to mention it in the respective BIP.
     471                 :            :  */
     472                 :            : enum GetDataMsg : uint32_t {
     473                 :            :     UNDEFINED = 0,
     474                 :            :     MSG_TX = 1,
     475                 :            :     MSG_BLOCK = 2,
     476                 :            :     MSG_WTX = 5,                                      //!< Defined in BIP 339
     477                 :            :     // The following can only occur in getdata. Invs always use TX/WTX or BLOCK.
     478                 :            :     MSG_FILTERED_BLOCK = 3,                           //!< Defined in BIP37
     479                 :            :     MSG_CMPCT_BLOCK = 4,                              //!< Defined in BIP152
     480                 :            :     MSG_WITNESS_BLOCK = MSG_BLOCK | MSG_WITNESS_FLAG, //!< Defined in BIP144
     481                 :            :     MSG_WITNESS_TX = MSG_TX | MSG_WITNESS_FLAG,       //!< Defined in BIP144
     482                 :            :     // MSG_FILTERED_WITNESS_BLOCK is defined in BIP144 as reserved for future
     483                 :            :     // use and remains unused.
     484                 :            :     // MSG_FILTERED_WITNESS_BLOCK = MSG_FILTERED_BLOCK | MSG_WITNESS_FLAG,
     485                 :            : };
     486                 :            : 
     487                 :            : /** inv message data */
     488                 :            : class CInv
     489                 :            : {
     490                 :            : public:
     491                 :            :     CInv();
     492                 :            :     CInv(uint32_t typeIn, const uint256& hashIn);
     493                 :            : 
     494                 :          0 :     SERIALIZE_METHODS(CInv, obj) { READWRITE(obj.type, obj.hash); }
     495                 :            : 
     496                 :            :     friend bool operator<(const CInv& a, const CInv& b);
     497                 :            : 
     498                 :            :     std::string GetCommand() const;
     499                 :            :     std::string ToString() const;
     500                 :            : 
     501                 :            :     // Single-message helper methods
     502                 :          0 :     bool IsMsgTx() const { return type == MSG_TX; }
     503                 :          0 :     bool IsMsgBlk() const { return type == MSG_BLOCK; }
     504                 :          0 :     bool IsMsgWtx() const { return type == MSG_WTX; }
     505                 :          0 :     bool IsMsgFilteredBlk() const { return type == MSG_FILTERED_BLOCK; }
     506                 :          0 :     bool IsMsgCmpctBlk() const { return type == MSG_CMPCT_BLOCK; }
     507                 :          0 :     bool IsMsgWitnessBlk() const { return type == MSG_WITNESS_BLOCK; }
     508                 :            : 
     509                 :            :     // Combined-message helper methods
     510                 :          0 :     bool IsGenTxMsg() const
     511                 :            :     {
     512 [ #  # ][ #  # ]:          0 :         return type == MSG_TX || type == MSG_WTX || type == MSG_WITNESS_TX;
     513                 :            :     }
     514                 :          0 :     bool IsGenBlkMsg() const
     515                 :            :     {
     516 [ #  # ][ #  # ]:          0 :         return type == MSG_BLOCK || type == MSG_FILTERED_BLOCK || type == MSG_CMPCT_BLOCK || type == MSG_WITNESS_BLOCK;
                 [ #  # ]
     517                 :            :     }
     518                 :            : 
     519                 :            :     uint32_t type;
     520                 :            :     uint256 hash;
     521                 :            : };
     522                 :            : 
     523                 :            : /** Convert a TX/WITNESS_TX/WTX CInv to a GenTxid. */
     524                 :            : GenTxid ToGenTxid(const CInv& inv);
     525                 :            : 
     526                 :            : #endif // BITCOIN_PROTOCOL_H

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