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main.h 21KB

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  1. // Copyright (c) 2009-2010 Satoshi Nakamoto
  2. // Copyright (c) 2009-2014 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. #ifndef BITCOIN_MAIN_H
  6. #define BITCOIN_MAIN_H
  7. #if defined(HAVE_CONFIG_H)
  8. #include "config/bitcoin-config.h"
  9. #endif
  10. #include "amount.h"
  11. #include "chain.h"
  12. #include "chainparams.h"
  13. #include "coins.h"
  14. #include "consensus/consensus.h"
  15. #include "net.h"
  16. #include "primitives/block.h"
  17. #include "primitives/transaction.h"
  18. #include "script/script.h"
  19. #include "script/sigcache.h"
  20. #include "script/standard.h"
  21. #include "sync.h"
  22. #include "tinyformat.h"
  23. #include "txmempool.h"
  24. #include "uint256.h"
  25. #include <algorithm>
  26. #include <exception>
  27. #include <map>
  28. #include <set>
  29. #include <stdint.h>
  30. #include <string>
  31. #include <utility>
  32. #include <vector>
  33. #include <boost/unordered_map.hpp>
  34. class CBlockIndex;
  35. class CBlockTreeDB;
  36. class CBloomFilter;
  37. class CInv;
  38. class CScriptCheck;
  39. class CValidationInterface;
  40. class CValidationState;
  41. struct CNodeStateStats;
  42. /** Default for -blockmaxsize and -blockminsize, which control the range of sizes the mining code will create **/
  43. static const unsigned int DEFAULT_BLOCK_MAX_SIZE = 750000;
  44. static const unsigned int DEFAULT_BLOCK_MIN_SIZE = 0;
  45. /** Default for -blockprioritysize, maximum space for zero/low-fee transactions **/
  46. static const unsigned int DEFAULT_BLOCK_PRIORITY_SIZE = 50000;
  47. /** The maximum size for transactions we're willing to relay/mine */
  48. static const unsigned int MAX_STANDARD_TX_SIZE = 100000;
  49. /** Maximum number of signature check operations in an IsStandard() P2SH script */
  50. static const unsigned int MAX_P2SH_SIGOPS = 15;
  51. /** The maximum number of sigops we're willing to relay/mine in a single tx */
  52. static const unsigned int MAX_STANDARD_TX_SIGOPS = MAX_BLOCK_SIGOPS/5;
  53. /** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
  54. static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
  55. /** The maximum size of a blk?????.dat file (since 0.8) */
  56. static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
  57. /** The pre-allocation chunk size for blk?????.dat files (since 0.8) */
  58. static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
  59. /** The pre-allocation chunk size for rev?????.dat files (since 0.8) */
  60. static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB
  61. /** Maximum number of script-checking threads allowed */
  62. static const int MAX_SCRIPTCHECK_THREADS = 16;
  63. /** -par default (number of script-checking threads, 0 = auto) */
  64. static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
  65. /** Number of blocks that can be requested at any given time from a single peer. */
  66. static const int MAX_BLOCKS_IN_TRANSIT_PER_PEER = 16;
  67. /** Timeout in seconds during which a peer must stall block download progress before being disconnected. */
  68. static const unsigned int BLOCK_STALLING_TIMEOUT = 2;
  69. /** Number of headers sent in one getheaders result. We rely on the assumption that if a peer sends
  70. * less than this number, we reached its tip. Changing this value is a protocol upgrade. */
  71. static const unsigned int MAX_HEADERS_RESULTS = 2000;
  72. /** Size of the "block download window": how far ahead of our current height do we fetch?
  73. * Larger windows tolerate larger download speed differences between peer, but increase the potential
  74. * degree of disordering of blocks on disk (which make reindexing and in the future perhaps pruning
  75. * harder). We'll probably want to make this a per-peer adaptive value at some point. */
  76. static const unsigned int BLOCK_DOWNLOAD_WINDOW = 1024;
  77. /** Time to wait (in seconds) between writing blocks/block index to disk. */
  78. static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
  79. /** Time to wait (in seconds) between flushing chainstate to disk. */
  80. static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60;
  81. /** Maximum length of reject messages. */
  82. static const unsigned int MAX_REJECT_MESSAGE_LENGTH = 111;
  83. struct BlockHasher
  84. {
  85. size_t operator()(const uint256& hash) const { return hash.GetCheapHash(); }
  86. };
  87. extern CScript COINBASE_FLAGS;
  88. extern CCriticalSection cs_main;
  89. extern CTxMemPool mempool;
  90. typedef boost::unordered_map<uint256, CBlockIndex*, BlockHasher> BlockMap;
  91. extern BlockMap mapBlockIndex;
  92. extern uint64_t nLastBlockTx;
  93. extern uint64_t nLastBlockSize;
  94. extern const std::string strMessageMagic;
  95. extern CWaitableCriticalSection csBestBlock;
  96. extern CConditionVariable cvBlockChange;
  97. extern bool fImporting;
  98. extern bool fReindex;
  99. extern int nScriptCheckThreads;
  100. extern bool fTxIndex;
  101. extern bool fIsBareMultisigStd;
  102. extern bool fCheckBlockIndex;
  103. extern bool fCheckpointsEnabled;
  104. extern size_t nCoinCacheUsage;
  105. extern CFeeRate minRelayTxFee;
  106. /** Best header we've seen so far (used for getheaders queries' starting points). */
  107. extern CBlockIndex *pindexBestHeader;
  108. /** Minimum disk space required - used in CheckDiskSpace() */
  109. static const uint64_t nMinDiskSpace = 52428800;
  110. /** Pruning-related variables and constants */
  111. /** True if any block files have ever been pruned. */
  112. extern bool fHavePruned;
  113. /** True if we're running in -prune mode. */
  114. extern bool fPruneMode;
  115. /** Number of MiB of block files that we're trying to stay below. */
  116. extern uint64_t nPruneTarget;
  117. /** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of chainActive.Tip() will not be pruned. */
  118. static const signed int MIN_BLOCKS_TO_KEEP = 288;
  119. // Require that user allocate at least 550MB for block & undo files (blk???.dat and rev???.dat)
  120. // At 1MB per block, 288 blocks = 288MB.
  121. // Add 15% for Undo data = 331MB
  122. // Add 20% for Orphan block rate = 397MB
  123. // We want the low water mark after pruning to be at least 397 MB and since we prune in
  124. // full block file chunks, we need the high water mark which triggers the prune to be
  125. // one 128MB block file + added 15% undo data = 147MB greater for a total of 545MB
  126. // Setting the target to > than 550MB will make it likely we can respect the target.
  127. static const signed int MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024;
  128. /** Register with a network node to receive its signals */
  129. void RegisterNodeSignals(CNodeSignals& nodeSignals);
  130. /** Unregister a network node */
  131. void UnregisterNodeSignals(CNodeSignals& nodeSignals);
  132. /**
  133. * Process an incoming block. This only returns after the best known valid
  134. * block is made active. Note that it does not, however, guarantee that the
  135. * specific block passed to it has been checked for validity!
  136. *
  137. * @param[out] state This may be set to an Error state if any error occurred processing it, including during validation/connection/etc of otherwise unrelated blocks during reorganisation; or it may be set to an Invalid state if pblock is itself invalid (but this is not guaranteed even when the block is checked). If you want to *possibly* get feedback on whether pblock is valid, you must also install a CValidationInterface (see validationinterface.h) - this will have its BlockChecked method called whenever *any* block completes validation.
  138. * @param[in] pfrom The node which we are receiving the block from; it is added to mapBlockSource and may be penalised if the block is invalid.
  139. * @param[in] pblock The block we want to process.
  140. * @param[in] fForceProcessing Process this block even if unrequested; used for non-network block sources and whitelisted peers.
  141. * @param[out] dbp If pblock is stored to disk (or already there), this will be set to its location.
  142. * @return True if state.IsValid()
  143. */
  144. bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, bool fForceProcessing, CDiskBlockPos *dbp);
  145. /** Check whether enough disk space is available for an incoming block */
  146. bool CheckDiskSpace(uint64_t nAdditionalBytes = 0);
  147. /** Open a block file (blk?????.dat) */
  148. FILE* OpenBlockFile(const CDiskBlockPos &pos, bool fReadOnly = false);
  149. /** Open an undo file (rev?????.dat) */
  150. FILE* OpenUndoFile(const CDiskBlockPos &pos, bool fReadOnly = false);
  151. /** Translation to a filesystem path */
  152. boost::filesystem::path GetBlockPosFilename(const CDiskBlockPos &pos, const char *prefix);
  153. /** Import blocks from an external file */
  154. bool LoadExternalBlockFile(FILE* fileIn, CDiskBlockPos *dbp = NULL);
  155. /** Initialize a new block tree database + block data on disk */
  156. bool InitBlockIndex();
  157. /** Load the block tree and coins database from disk */
  158. bool LoadBlockIndex();
  159. /** Unload database information */
  160. void UnloadBlockIndex();
  161. /** Process protocol messages received from a given node */
  162. bool ProcessMessages(CNode* pfrom);
  163. /**
  164. * Send queued protocol messages to be sent to a give node.
  165. *
  166. * @param[in] pto The node which we are sending messages to.
  167. * @param[in] fSendTrickle When true send the trickled data, otherwise trickle the data until true.
  168. */
  169. bool SendMessages(CNode* pto, bool fSendTrickle);
  170. /** Run an instance of the script checking thread */
  171. void ThreadScriptCheck();
  172. /** Try to detect Partition (network isolation) attacks against us */
  173. void PartitionCheck(bool (*initialDownloadCheck)(), CCriticalSection& cs, const CChain& chain, int64_t nPowTargetSpacing);
  174. /** Check whether we are doing an initial block download (synchronizing from disk or network) */
  175. bool IsInitialBlockDownload();
  176. /** Format a string that describes several potential problems detected by the core */
  177. std::string GetWarnings(std::string strFor);
  178. /** Retrieve a transaction (from memory pool, or from disk, if possible) */
  179. bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock, bool fAllowSlow = false);
  180. /** Find the best known block, and make it the tip of the block chain */
  181. bool ActivateBestChain(CValidationState &state, CBlock *pblock = NULL);
  182. CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams);
  183. /**
  184. * Prune block and undo files (blk???.dat and undo???.dat) so that the disk space used is less than a user-defined target.
  185. * The user sets the target (in MB) on the command line or in config file. This will be run on startup and whenever new
  186. * space is allocated in a block or undo file, staying below the target. Changing back to unpruned requires a reindex
  187. * (which in this case means the blockchain must be re-downloaded.)
  188. *
  189. * Pruning functions are called from FlushStateToDisk when the global fCheckForPruning flag has been set.
  190. * Block and undo files are deleted in lock-step (when blk00003.dat is deleted, so is rev00003.dat.)
  191. * Pruning cannot take place until the longest chain is at least a certain length (100000 on mainnet, 1000 on testnet, 10 on regtest).
  192. * Pruning will never delete a block within a defined distance (currently 288) from the active chain's tip.
  193. * The block index is updated by unsetting HAVE_DATA and HAVE_UNDO for any blocks that were stored in the deleted files.
  194. * A db flag records the fact that at least some block files have been pruned.
  195. *
  196. * @param[out] setFilesToPrune The set of file indices that can be unlinked will be returned
  197. */
  198. void FindFilesToPrune(std::set<int>& setFilesToPrune);
  199. /**
  200. * Actually unlink the specified files
  201. */
  202. void UnlinkPrunedFiles(std::set<int>& setFilesToPrune);
  203. /** Create a new block index entry for a given block hash */
  204. CBlockIndex * InsertBlockIndex(uint256 hash);
  205. /** Get statistics from node state */
  206. bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
  207. /** Increase a node's misbehavior score. */
  208. void Misbehaving(NodeId nodeid, int howmuch);
  209. /** Flush all state, indexes and buffers to disk. */
  210. void FlushStateToDisk();
  211. /** Prune block files and flush state to disk. */
  212. void PruneAndFlush();
  213. /** (try to) add transaction to memory pool **/
  214. bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransaction &tx, bool fLimitFree,
  215. bool* pfMissingInputs, bool fRejectAbsurdFee=false);
  216. struct CNodeStateStats {
  217. int nMisbehavior;
  218. int nSyncHeight;
  219. int nCommonHeight;
  220. std::vector<int> vHeightInFlight;
  221. };
  222. struct CDiskTxPos : public CDiskBlockPos
  223. {
  224. unsigned int nTxOffset; // after header
  225. ADD_SERIALIZE_METHODS;
  226. template <typename Stream, typename Operation>
  227. inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
  228. READWRITE(*(CDiskBlockPos*)this);
  229. READWRITE(VARINT(nTxOffset));
  230. }
  231. CDiskTxPos(const CDiskBlockPos &blockIn, unsigned int nTxOffsetIn) : CDiskBlockPos(blockIn.nFile, blockIn.nPos), nTxOffset(nTxOffsetIn) {
  232. }
  233. CDiskTxPos() {
  234. SetNull();
  235. }
  236. void SetNull() {
  237. CDiskBlockPos::SetNull();
  238. nTxOffset = 0;
  239. }
  240. };
  241. CAmount GetMinRelayFee(const CTransaction& tx, unsigned int nBytes, bool fAllowFree);
  242. /**
  243. * Check transaction inputs, and make sure any
  244. * pay-to-script-hash transactions are evaluating IsStandard scripts
  245. *
  246. * Why bother? To avoid denial-of-service attacks; an attacker
  247. * can submit a standard HASH... OP_EQUAL transaction,
  248. * which will get accepted into blocks. The redemption
  249. * script can be anything; an attacker could use a very
  250. * expensive-to-check-upon-redemption script like:
  251. * DUP CHECKSIG DROP ... repeated 100 times... OP_1
  252. */
  253. /**
  254. * Check for standard transaction types
  255. * @param[in] mapInputs Map of previous transactions that have outputs we're spending
  256. * @return True if all inputs (scriptSigs) use only standard transaction forms
  257. */
  258. bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
  259. /**
  260. * Count ECDSA signature operations the old-fashioned (pre-0.6) way
  261. * @return number of sigops this transaction's outputs will produce when spent
  262. * @see CTransaction::FetchInputs
  263. */
  264. unsigned int GetLegacySigOpCount(const CTransaction& tx);
  265. /**
  266. * Count ECDSA signature operations in pay-to-script-hash inputs.
  267. *
  268. * @param[in] mapInputs Map of previous transactions that have outputs we're spending
  269. * @return maximum number of sigops required to validate this transaction's inputs
  270. * @see CTransaction::FetchInputs
  271. */
  272. unsigned int GetP2SHSigOpCount(const CTransaction& tx, const CCoinsViewCache& mapInputs);
  273. /**
  274. * Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts)
  275. * This does not modify the UTXO set. If pvChecks is not NULL, script checks are pushed onto it
  276. * instead of being performed inline.
  277. */
  278. bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsViewCache &view, bool fScriptChecks,
  279. unsigned int flags, bool cacheStore, std::vector<CScriptCheck> *pvChecks = NULL);
  280. /** Apply the effects of this transaction on the UTXO set represented by view */
  281. void UpdateCoins(const CTransaction& tx, CValidationState &state, CCoinsViewCache &inputs, int nHeight);
  282. /** Context-independent validity checks */
  283. bool CheckTransaction(const CTransaction& tx, CValidationState& state);
  284. /** Check for standard transaction types
  285. * @return True if all outputs (scriptPubKeys) use only standard transaction forms
  286. */
  287. bool IsStandardTx(const CTransaction& tx, std::string& reason);
  288. /**
  289. * Check if transaction is final and can be included in a block with the
  290. * specified height and time. Consensus critical.
  291. */
  292. bool IsFinalTx(const CTransaction &tx, int nBlockHeight, int64_t nBlockTime);
  293. /**
  294. * Check if transaction will be final in the next block to be created.
  295. *
  296. * Calls IsFinalTx() with current block height and appropriate block time.
  297. */
  298. bool CheckFinalTx(const CTransaction &tx);
  299. /**
  300. * Closure representing one script verification
  301. * Note that this stores references to the spending transaction
  302. */
  303. class CScriptCheck
  304. {
  305. private:
  306. CScript scriptPubKey;
  307. const CTransaction *ptxTo;
  308. unsigned int nIn;
  309. unsigned int nFlags;
  310. bool cacheStore;
  311. ScriptError error;
  312. public:
  313. CScriptCheck(): ptxTo(0), nIn(0), nFlags(0), cacheStore(false), error(SCRIPT_ERR_UNKNOWN_ERROR) {}
  314. CScriptCheck(const CCoins& txFromIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn) :
  315. scriptPubKey(txFromIn.vout[txToIn.vin[nInIn].prevout.n].scriptPubKey),
  316. ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), error(SCRIPT_ERR_UNKNOWN_ERROR) { }
  317. bool operator()();
  318. void swap(CScriptCheck &check) {
  319. scriptPubKey.swap(check.scriptPubKey);
  320. std::swap(ptxTo, check.ptxTo);
  321. std::swap(nIn, check.nIn);
  322. std::swap(nFlags, check.nFlags);
  323. std::swap(cacheStore, check.cacheStore);
  324. std::swap(error, check.error);
  325. }
  326. ScriptError GetScriptError() const { return error; }
  327. };
  328. /** Functions for disk access for blocks */
  329. bool WriteBlockToDisk(CBlock& block, CDiskBlockPos& pos, const CMessageHeader::MessageStartChars& messageStart);
  330. bool ReadBlockFromDisk(CBlock& block, const CDiskBlockPos& pos);
  331. bool ReadBlockFromDisk(CBlock& block, const CBlockIndex* pindex);
  332. /** Functions for validating blocks and updating the block tree */
  333. /** Undo the effects of this block (with given index) on the UTXO set represented by coins.
  334. * In case pfClean is provided, operation will try to be tolerant about errors, and *pfClean
  335. * will be true if no problems were found. Otherwise, the return value will be false in case
  336. * of problems. Note that in any case, coins may be modified. */
  337. bool DisconnectBlock(CBlock& block, CValidationState& state, CBlockIndex* pindex, CCoinsViewCache& coins, bool* pfClean = NULL);
  338. /** Apply the effects of this block (with given index) on the UTXO set represented by coins */
  339. bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pindex, CCoinsViewCache& coins, bool fJustCheck = false);
  340. /** Context-independent validity checks */
  341. bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, bool fCheckPOW = true);
  342. bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW = true, bool fCheckMerkleRoot = true);
  343. /** Context-dependent validity checks */
  344. bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, CBlockIndex *pindexPrev);
  345. bool ContextualCheckBlock(const CBlock& block, CValidationState& state, CBlockIndex *pindexPrev);
  346. /** Check a block is completely valid from start to finish (only works on top of our current best block, with cs_main held) */
  347. bool TestBlockValidity(CValidationState &state, const CBlock& block, CBlockIndex *pindexPrev, bool fCheckPOW = true, bool fCheckMerkleRoot = true);
  348. /** Store block on disk. If dbp is non-NULL, the file is known to already reside on disk */
  349. bool AcceptBlock(CBlock& block, CValidationState& state, CBlockIndex **pindex, bool fRequested, CDiskBlockPos* dbp);
  350. bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state, CBlockIndex **ppindex= NULL);
  351. class CBlockFileInfo
  352. {
  353. public:
  354. unsigned int nBlocks; //! number of blocks stored in file
  355. unsigned int nSize; //! number of used bytes of block file
  356. unsigned int nUndoSize; //! number of used bytes in the undo file
  357. unsigned int nHeightFirst; //! lowest height of block in file
  358. unsigned int nHeightLast; //! highest height of block in file
  359. uint64_t nTimeFirst; //! earliest time of block in file
  360. uint64_t nTimeLast; //! latest time of block in file
  361. ADD_SERIALIZE_METHODS;
  362. template <typename Stream, typename Operation>
  363. inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
  364. READWRITE(VARINT(nBlocks));
  365. READWRITE(VARINT(nSize));
  366. READWRITE(VARINT(nUndoSize));
  367. READWRITE(VARINT(nHeightFirst));
  368. READWRITE(VARINT(nHeightLast));
  369. READWRITE(VARINT(nTimeFirst));
  370. READWRITE(VARINT(nTimeLast));
  371. }
  372. void SetNull() {
  373. nBlocks = 0;
  374. nSize = 0;
  375. nUndoSize = 0;
  376. nHeightFirst = 0;
  377. nHeightLast = 0;
  378. nTimeFirst = 0;
  379. nTimeLast = 0;
  380. }
  381. CBlockFileInfo() {
  382. SetNull();
  383. }
  384. std::string ToString() const;
  385. /** update statistics (does not update nSize) */
  386. void AddBlock(unsigned int nHeightIn, uint64_t nTimeIn) {
  387. if (nBlocks==0 || nHeightFirst > nHeightIn)
  388. nHeightFirst = nHeightIn;
  389. if (nBlocks==0 || nTimeFirst > nTimeIn)
  390. nTimeFirst = nTimeIn;
  391. nBlocks++;
  392. if (nHeightIn > nHeightLast)
  393. nHeightLast = nHeightIn;
  394. if (nTimeIn > nTimeLast)
  395. nTimeLast = nTimeIn;
  396. }
  397. };
  398. /** RAII wrapper for VerifyDB: Verify consistency of the block and coin databases */
  399. class CVerifyDB {
  400. public:
  401. CVerifyDB();
  402. ~CVerifyDB();
  403. bool VerifyDB(CCoinsView *coinsview, int nCheckLevel, int nCheckDepth);
  404. };
  405. /** Find the last common block between the parameter chain and a locator. */
  406. CBlockIndex* FindForkInGlobalIndex(const CChain& chain, const CBlockLocator& locator);
  407. /** Mark a block as invalid. */
  408. bool InvalidateBlock(CValidationState& state, CBlockIndex *pindex);
  409. /** Remove invalidity status from a block and its descendants. */
  410. bool ReconsiderBlock(CValidationState& state, CBlockIndex *pindex);
  411. /** The currently-connected chain of blocks. */
  412. extern CChain chainActive;
  413. /** Global variable that points to the active CCoinsView (protected by cs_main) */
  414. extern CCoinsViewCache *pcoinsTip;
  415. /** Global variable that points to the active block tree (protected by cs_main) */
  416. extern CBlockTreeDB *pblocktree;
  417. #endif // BITCOIN_MAIN_H