diff options
Diffstat (limited to 'src/protocol.h')
| -rw-r--r-- | src/protocol.h | 319 |
1 files changed, 279 insertions, 40 deletions
diff --git a/src/protocol.h b/src/protocol.h index 50aeaf44ba..56b59aed3f 100644 --- a/src/protocol.h +++ b/src/protocol.h @@ -1,5 +1,5 @@ // Copyright (c) 2009-2010 Satoshi Nakamoto -// Copyright (c) 2009-2013 The Bitcoin Core developers +// Copyright (c) 2009-2016 The Bitcoin Core developers // Distributed under the MIT software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. @@ -10,7 +10,7 @@ #ifndef BITCOIN_PROTOCOL_H #define BITCOIN_PROTOCOL_H -#include "netbase.h" +#include "netaddress.h" #include "serialize.h" #include "uint256.h" #include "version.h" @@ -18,8 +18,6 @@ #include <stdint.h> #include <string> -#define MESSAGE_START_SIZE 4 - /** Message header. * (4) message start. * (12) command. @@ -29,9 +27,19 @@ class CMessageHeader { public: + enum { + MESSAGE_START_SIZE = 4, + COMMAND_SIZE = 12, + MESSAGE_SIZE_SIZE = 4, + CHECKSUM_SIZE = 4, + + MESSAGE_SIZE_OFFSET = MESSAGE_START_SIZE + COMMAND_SIZE, + CHECKSUM_OFFSET = MESSAGE_SIZE_OFFSET + MESSAGE_SIZE_SIZE, + HEADER_SIZE = MESSAGE_START_SIZE + COMMAND_SIZE + MESSAGE_SIZE_SIZE + CHECKSUM_SIZE + }; typedef unsigned char MessageStartChars[MESSAGE_START_SIZE]; - CMessageHeader(const MessageStartChars& pchMessageStartIn); + explicit CMessageHeader(const MessageStartChars& pchMessageStartIn); CMessageHeader(const MessageStartChars& pchMessageStartIn, const char* pszCommand, unsigned int nMessageSizeIn); std::string GetCommand() const; @@ -40,33 +48,207 @@ public: ADD_SERIALIZE_METHODS; template <typename Stream, typename Operation> - inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) + inline void SerializationOp(Stream& s, Operation ser_action) { READWRITE(FLATDATA(pchMessageStart)); READWRITE(FLATDATA(pchCommand)); READWRITE(nMessageSize); - READWRITE(nChecksum); + READWRITE(FLATDATA(pchChecksum)); } - // TODO: make private (improves encapsulation) -public: - enum { - COMMAND_SIZE = 12, - MESSAGE_SIZE_SIZE = sizeof(int), - CHECKSUM_SIZE = sizeof(int), - - MESSAGE_SIZE_OFFSET = MESSAGE_START_SIZE + COMMAND_SIZE, - CHECKSUM_OFFSET = MESSAGE_SIZE_OFFSET + MESSAGE_SIZE_SIZE, - HEADER_SIZE = MESSAGE_START_SIZE + COMMAND_SIZE + MESSAGE_SIZE_SIZE + CHECKSUM_SIZE - }; char pchMessageStart[MESSAGE_START_SIZE]; char pchCommand[COMMAND_SIZE]; - unsigned int nMessageSize; - unsigned int nChecksum; + uint32_t nMessageSize; + uint8_t pchChecksum[CHECKSUM_SIZE]; +}; + +/** + * Bitcoin protocol message types. When adding new message types, don't forget + * to update allNetMessageTypes in protocol.cpp. + */ +namespace NetMsgType { + +/** + * The version message provides information about the transmitting node to the + * receiving node at the beginning of a connection. + * @see https://bitcoin.org/en/developer-reference#version + */ +extern const char *VERSION; +/** + * The verack message acknowledges a previously-received version message, + * informing the connecting node that it can begin to send other messages. + * @see https://bitcoin.org/en/developer-reference#verack + */ +extern const char *VERACK; +/** + * The addr (IP address) message relays connection information for peers on the + * network. + * @see https://bitcoin.org/en/developer-reference#addr + */ +extern const char *ADDR; +/** + * The inv message (inventory message) transmits one or more inventories of + * objects known to the transmitting peer. + * @see https://bitcoin.org/en/developer-reference#inv + */ +extern const char *INV; +/** + * The getdata message requests one or more data objects from another node. + * @see https://bitcoin.org/en/developer-reference#getdata + */ +extern const char *GETDATA; +/** + * The merkleblock message is a reply to a getdata message which requested a + * block using the inventory type MSG_MERKLEBLOCK. + * @since protocol version 70001 as described by BIP37. + * @see https://bitcoin.org/en/developer-reference#merkleblock + */ +extern const char *MERKLEBLOCK; +/** + * The getblocks message requests an inv message that provides block header + * hashes starting from a particular point in the block chain. + * @see https://bitcoin.org/en/developer-reference#getblocks + */ +extern const char *GETBLOCKS; +/** + * The getheaders message requests a headers message that provides block + * headers starting from a particular point in the block chain. + * @since protocol version 31800. + * @see https://bitcoin.org/en/developer-reference#getheaders + */ +extern const char *GETHEADERS; +/** + * The tx message transmits a single transaction. + * @see https://bitcoin.org/en/developer-reference#tx + */ +extern const char *TX; +/** + * The headers message sends one or more block headers to a node which + * previously requested certain headers with a getheaders message. + * @since protocol version 31800. + * @see https://bitcoin.org/en/developer-reference#headers + */ +extern const char *HEADERS; +/** + * The block message transmits a single serialized block. + * @see https://bitcoin.org/en/developer-reference#block + */ +extern const char *BLOCK; +/** + * The getaddr message requests an addr message from the receiving node, + * preferably one with lots of IP addresses of other receiving nodes. + * @see https://bitcoin.org/en/developer-reference#getaddr + */ +extern const char *GETADDR; +/** + * The mempool message requests the TXIDs of transactions that the receiving + * node has verified as valid but which have not yet appeared in a block. + * @since protocol version 60002. + * @see https://bitcoin.org/en/developer-reference#mempool + */ +extern const char *MEMPOOL; +/** + * The ping message is sent periodically to help confirm that the receiving + * peer is still connected. + * @see https://bitcoin.org/en/developer-reference#ping + */ +extern const char *PING; +/** + * The pong message replies to a ping message, proving to the pinging node that + * the ponging node is still alive. + * @since protocol version 60001 as described by BIP31. + * @see https://bitcoin.org/en/developer-reference#pong + */ +extern const char *PONG; +/** + * The notfound message is a reply to a getdata message which requested an + * object the receiving node does not have available for relay. + * @since protocol version 70001. + * @see https://bitcoin.org/en/developer-reference#notfound + */ +extern const char *NOTFOUND; +/** + * The filterload message tells the receiving peer to filter all relayed + * transactions and requested merkle blocks through the provided filter. + * @since protocol version 70001 as described by BIP37. + * Only available with service bit NODE_BLOOM since protocol version + * 70011 as described by BIP111. + * @see https://bitcoin.org/en/developer-reference#filterload + */ +extern const char *FILTERLOAD; +/** + * The filteradd message tells the receiving peer to add a single element to a + * previously-set bloom filter, such as a new public key. + * @since protocol version 70001 as described by BIP37. + * Only available with service bit NODE_BLOOM since protocol version + * 70011 as described by BIP111. + * @see https://bitcoin.org/en/developer-reference#filteradd + */ +extern const char *FILTERADD; +/** + * The filterclear message tells the receiving peer to remove a previously-set + * bloom filter. + * @since protocol version 70001 as described by BIP37. + * Only available with service bit NODE_BLOOM since protocol version + * 70011 as described by BIP111. + * @see https://bitcoin.org/en/developer-reference#filterclear + */ +extern const char *FILTERCLEAR; +/** + * The reject message informs the receiving node that one of its previous + * messages has been rejected. + * @since protocol version 70002 as described by BIP61. + * @see https://bitcoin.org/en/developer-reference#reject + */ +extern const char *REJECT; +/** + * Indicates that a node prefers to receive new block announcements via a + * "headers" message rather than an "inv". + * @since protocol version 70012 as described by BIP130. + * @see https://bitcoin.org/en/developer-reference#sendheaders + */ +extern const char *SENDHEADERS; +/** + * The feefilter message tells the receiving peer not to inv us any txs + * which do not meet the specified min fee rate. + * @since protocol version 70013 as described by BIP133 + */ +extern const char *FEEFILTER; +/** + * Contains a 1-byte bool and 8-byte LE version number. + * Indicates that a node is willing to provide blocks via "cmpctblock" messages. + * May indicate that a node prefers to receive new block announcements via a + * "cmpctblock" message rather than an "inv", depending on message contents. + * @since protocol version 70014 as described by BIP 152 + */ +extern const char *SENDCMPCT; +/** + * Contains a CBlockHeaderAndShortTxIDs object - providing a header and + * list of "short txids". + * @since protocol version 70014 as described by BIP 152 + */ +extern const char *CMPCTBLOCK; +/** + * Contains a BlockTransactionsRequest + * Peer should respond with "blocktxn" message. + * @since protocol version 70014 as described by BIP 152 + */ +extern const char *GETBLOCKTXN; +/** + * Contains a BlockTransactions. + * Sent in response to a "getblocktxn" message. + * @since protocol version 70014 as described by BIP 152 + */ +extern const char *BLOCKTXN; }; +/* Get a vector of all valid message types (see above) */ +const std::vector<std::string> &getAllNetMessageTypes(); + /** nServices flags */ -enum { +enum ServiceFlags : uint64_t { + // Nothing + NODE_NONE = 0, // NODE_NETWORK means that the node is capable of serving the block chain. It is currently // set by all Bitcoin Core nodes, and is unset by SPV clients or other peers that just want // network services but don't provide them. @@ -79,6 +261,12 @@ enum { // Bitcoin Core nodes used to support this by default, without advertising this bit, // but no longer do as of protocol version 70011 (= NO_BLOOM_VERSION) NODE_BLOOM = (1 << 2), + // NODE_WITNESS indicates that a node can be asked for blocks and transactions including + // witness data. + NODE_WITNESS = (1 << 3), + // NODE_XTHIN means the node supports Xtreme Thinblocks + // If this is turned off then the node will not service nor make xthin requests + NODE_XTHIN = (1 << 4), // Bits 24-31 are reserved for temporary experiments. Just pick a bit that // isn't getting used, or one not being used much, and notify the @@ -89,51 +277,111 @@ enum { // BIP process. }; +/** + * Gets the set of service flags which are "desirable" for a given peer. + * + * These are the flags which are required for a peer to support for them + * to be "interesting" to us, ie for us to wish to use one of our few + * outbound connection slots for or for us to wish to prioritize keeping + * their connection around. + * + * Relevant service flags may be peer- and state-specific in that the + * version of the peer may determine which flags are required (eg in the + * case of NODE_NETWORK_LIMITED where we seek out NODE_NETWORK peers + * unless they set NODE_NETWORK_LIMITED and we are out of IBD, in which + * case NODE_NETWORK_LIMITED suffices). + * + * Thus, generally, avoid calling with peerServices == NODE_NONE. + */ +static ServiceFlags GetDesirableServiceFlags(ServiceFlags services) { + return ServiceFlags(NODE_NETWORK | NODE_WITNESS); +} + +/** + * A shortcut for (services & GetDesirableServiceFlags(services)) + * == GetDesirableServiceFlags(services), ie determines whether the given + * set of service flags are sufficient for a peer to be "relevant". + */ +static inline bool HasAllDesirableServiceFlags(ServiceFlags services) { + return !(GetDesirableServiceFlags(services) & (~services)); +} + +/** + * Checks if a peer with the given service flags may be capable of having a + * robust address-storage DB. Currently an alias for checking NODE_NETWORK. + */ +static inline bool MayHaveUsefulAddressDB(ServiceFlags services) { + return services & NODE_NETWORK; +} + /** A CService with information about it as peer */ class CAddress : public CService { public: CAddress(); - explicit CAddress(CService ipIn, uint64_t nServicesIn = NODE_NETWORK); + explicit CAddress(CService ipIn, ServiceFlags nServicesIn); void Init(); ADD_SERIALIZE_METHODS; template <typename Stream, typename Operation> - inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) + inline void SerializationOp(Stream& s, Operation ser_action) { if (ser_action.ForRead()) Init(); - if (nType & SER_DISK) + int nVersion = s.GetVersion(); + if (s.GetType() & SER_DISK) READWRITE(nVersion); - if ((nType & SER_DISK) || - (nVersion >= CADDR_TIME_VERSION && !(nType & SER_GETHASH))) + if ((s.GetType() & SER_DISK) || + (nVersion >= CADDR_TIME_VERSION && !(s.GetType() & SER_GETHASH))) READWRITE(nTime); - READWRITE(nServices); + uint64_t nServicesInt = nServices; + READWRITE(nServicesInt); + nServices = (ServiceFlags)nServicesInt; READWRITE(*(CService*)this); } // TODO: make private (improves encapsulation) public: - uint64_t nServices; + ServiceFlags nServices; // disk and network only unsigned int nTime; }; +/** getdata message type flags */ +const uint32_t MSG_WITNESS_FLAG = 1 << 30; +const uint32_t MSG_TYPE_MASK = 0xffffffff >> 2; + +/** getdata / inv message types. + * These numbers are defined by the protocol. When adding a new value, be sure + * to mention it in the respective BIP. + */ +enum GetDataMsg +{ + UNDEFINED = 0, + MSG_TX = 1, + MSG_BLOCK = 2, + // The following can only occur in getdata. Invs always use TX or BLOCK. + MSG_FILTERED_BLOCK = 3, //!< Defined in BIP37 + MSG_CMPCT_BLOCK = 4, //!< Defined in BIP152 + MSG_WITNESS_BLOCK = MSG_BLOCK | MSG_WITNESS_FLAG, //!< Defined in BIP144 + MSG_WITNESS_TX = MSG_TX | MSG_WITNESS_FLAG, //!< Defined in BIP144 + MSG_FILTERED_WITNESS_BLOCK = MSG_FILTERED_BLOCK | MSG_WITNESS_FLAG, +}; + /** inv message data */ class CInv { public: CInv(); CInv(int typeIn, const uint256& hashIn); - CInv(const std::string& strType, const uint256& hashIn); ADD_SERIALIZE_METHODS; template <typename Stream, typename Operation> - inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) + inline void SerializationOp(Stream& s, Operation ser_action) { READWRITE(type); READWRITE(hash); @@ -141,8 +389,7 @@ public: friend bool operator<(const CInv& a, const CInv& b); - bool IsKnownType() const; - const char* GetCommand() const; + std::string GetCommand() const; std::string ToString() const; // TODO: make private (improves encapsulation) @@ -151,12 +398,4 @@ public: uint256 hash; }; -enum { - MSG_TX = 1, - MSG_BLOCK, - // Nodes may always request a MSG_FILTERED_BLOCK in a getdata, however, - // MSG_FILTERED_BLOCK should not appear in any invs except as a part of getdata. - MSG_FILTERED_BLOCK, -}; - #endif // BITCOIN_PROTOCOL_H |