diff options
Diffstat (limited to 'src/main.h')
| -rw-r--r-- | src/main.h | 259 |
1 files changed, 238 insertions, 21 deletions
diff --git a/src/main.h b/src/main.h index 8bceffbaf9..2d3a9f5bd0 100644 --- a/src/main.h +++ b/src/main.h @@ -53,6 +53,8 @@ inline bool MoneyRange(int64 nValue) { return (nValue >= 0 && nValue <= MAX_MONE static const int COINBASE_MATURITY = 100; /** Threshold for nLockTime: below this value it is interpreted as block number, otherwise as UNIX timestamp. */ static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov 5 00:53:20 1985 UTC +/** Maximum number of script-checking threads allowed */ +static const int MAX_SCRIPTCHECK_THREADS = 16; #ifdef USE_UPNP static const int fHaveUPnP = true; #else @@ -90,6 +92,7 @@ extern unsigned char pchMessageStart[4]; extern bool fImporting; extern bool fReindex; extern bool fBenchmark; +extern int nScriptCheckThreads; extern unsigned int nCoinCacheSize; // Settings @@ -107,6 +110,9 @@ class CCoins; class CTxUndo; class CCoinsView; class CCoinsViewCache; +class CScriptCheck; + +struct CBlockTemplate; /** Register a wallet to receive updates from core */ void RegisterWallet(CWallet* pwalletIn); @@ -117,7 +123,7 @@ void SyncWithWallets(const uint256 &hash, const CTransaction& tx, const CBlock* /** Process an incoming block */ bool ProcessBlock(CNode* pfrom, CBlock* pblock, CDiskBlockPos *dbp = NULL); /** Check whether enough disk space is available for an incoming block */ -bool CheckDiskSpace(uint64 nAdditionalBytes=0); +bool CheckDiskSpace(uint64 nAdditionalBytes = 0); /** Open a block file (blk?????.dat) */ FILE* OpenBlockFile(const CDiskBlockPos &pos, bool fReadOnly = false); /** Open an undo file (rev?????.dat) */ @@ -126,6 +132,8 @@ FILE* OpenUndoFile(const CDiskBlockPos &pos, bool fReadOnly = false); bool LoadExternalBlockFile(FILE* fileIn, CDiskBlockPos *dbp = NULL); /** Load the block tree and coins database from disk */ bool LoadBlockIndex(); +/** Verify consistency of the block and coin databases */ +bool VerifyDB(); /** Print the loaded block tree */ void PrintBlockTree(); /** Find a block by height in the currently-connected chain */ @@ -136,10 +144,14 @@ bool ProcessMessages(CNode* pfrom); bool SendMessages(CNode* pto, bool fSendTrickle); /** Run the importer thread, which deals with reindexing, loading bootstrap.dat, and whatever is passed to -loadblock */ void ThreadImport(void *parg); +/** Run an instance of the script checking thread */ +void ThreadScriptCheck(void* parg); +/** Stop the script checking threads */ +void ThreadScriptCheckQuit(); /** Run the miner threads */ void GenerateBitcoins(bool fGenerate, CWallet* pwallet); /** Generate a new block, without valid proof-of-work */ -CBlock* CreateNewBlock(CReserveKey& reservekey); +CBlockTemplate* CreateNewBlock(CReserveKey& reservekey); /** Modify the extranonce in a block */ void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce); /** Do mining precalculation */ @@ -164,6 +176,8 @@ bool SetBestChain(CBlockIndex* pindexNew); bool ConnectBestBlock(); /** Create a new block index entry for a given block hash */ CBlockIndex * InsertBlockIndex(uint256 hash); +/** Verify a signature */ +bool VerifySignature(const CCoins& txFrom, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType); @@ -428,16 +442,8 @@ enum GetMinFee_mode GMF_SEND, }; -// Modes for script/signature checking -enum CheckSig_mode -{ - CS_NEVER, // never validate scripts - CS_AFTER_CHECKPOINT, // validate scripts after the last checkpoint - CS_ALWAYS // always validate scripts -}; - /** The basic transaction that is broadcasted on the network and contained in - * blocks. A transaction can contain multiple inputs and outputs. + * blocks. A transaction can contain multiple inputs and outputs. */ class CTransaction { @@ -544,13 +550,11 @@ public: /** Check for standard transaction types @param[in] mapInputs Map of previous transactions that have outputs we're spending @return True if all inputs (scriptSigs) use only standard transaction forms - @see CTransaction::FetchInputs */ bool AreInputsStandard(CCoinsViewCache& mapInputs) const; /** Count ECDSA signature operations the old-fashioned (pre-0.6) way @return number of sigops this transaction's outputs will produce when spent - @see CTransaction::FetchInputs */ unsigned int GetLegacySigOpCount() const; @@ -558,7 +562,6 @@ public: @param[in] mapInputs Map of previous transactions that have outputs we're spending @return maximum number of sigops required to validate this transaction's inputs - @see CTransaction::FetchInputs */ unsigned int GetP2SHSigOpCount(CCoinsViewCache& mapInputs) const; @@ -583,7 +586,6 @@ public: @param[in] mapInputs Map of previous transactions that have outputs we're spending @return Sum of value of all inputs (scriptSigs) - @see CTransaction::FetchInputs */ int64 GetValueIn(CCoinsViewCache& mapInputs) const; @@ -639,8 +641,11 @@ public: bool HaveInputs(CCoinsViewCache &view) const; // Check whether all inputs of this transaction are valid (no double spends, scripts & sigs, amounts) - // This does not modify the UTXO set - bool CheckInputs(CCoinsViewCache &view, enum CheckSig_mode csmode, unsigned int flags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC) const; + // This does not modify the UTXO set. If pvChecks is not NULL, script checks are pushed onto it + // instead of being performed inline. + bool CheckInputs(CCoinsViewCache &view, bool fScriptChecks = true, + unsigned int flags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC, + std::vector<CScriptCheck> *pvChecks = NULL) const; // Apply the effects of this transaction on the UTXO set represented by view bool UpdateCoins(CCoinsViewCache &view, CTxUndo &txundo, int nHeight, const uint256 &txhash) const; @@ -746,7 +751,7 @@ public: READWRITE(vtxundo); ) - bool WriteToDisk(CDiskBlockPos &pos) + bool WriteToDisk(CDiskBlockPos &pos, const uint256 &hashBlock) { // Open history file to append CAutoFile fileout = CAutoFile(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION); @@ -764,6 +769,12 @@ public: pos.nPos = (unsigned int)fileOutPos; fileout << *this; + // calculate & write checksum + CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION); + hasher << hashBlock; + hasher << *this; + fileout << hasher.GetHash(); + // Flush stdio buffers and commit to disk before returning fflush(fileout); if (!IsInitialBlockDownload()) @@ -771,6 +782,43 @@ public: return true; } + + bool ReadFromDisk(const CDiskBlockPos &pos, const uint256 &hashBlock) + { + // Open history file to read + CAutoFile filein = CAutoFile(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION); + if (!filein) + return error("CBlockUndo::ReadFromDisk() : OpenBlockFile failed"); + + // Read block + uint256 hashChecksum; + try { + filein >> *this; + } + catch (std::exception &e) { + return error("%s() : deserialize or I/O error", __PRETTY_FUNCTION__); + } + + // for compatibility with pre-release code that didn't write checksums to undo data + // TODO: replace by a simply 'filein >> hashChecksum' in the above try block + try { + filein >> hashChecksum; + } catch (std::exception &e) { + hashChecksum = 0; + } + uint32_t hashInit = hashChecksum.Get64(0) & 0xFFFFFFFFUL; + if (hashChecksum == 0 || memcmp(&hashInit, pchMessageStart, 4) == 0) + return true; + + // Verify checksum + CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION); + hasher << hashBlock; + hasher << *this; + if (hashChecksum != hasher.GetHash()) + return error("CBlockUndo::ReadFromDisk() : checksum mismatch"); + + return true; + } }; /** pruned version of CTransaction: only retains metadata and unspent transaction outputs @@ -1013,7 +1061,33 @@ public: } }; +/** Closure representing one script verification + * Note that this stores references to the spending transaction */ +class CScriptCheck +{ +private: + CScript scriptPubKey; + const CTransaction *ptxTo; + unsigned int nIn; + unsigned int nFlags; + int nHashType; +public: + CScriptCheck() {} + CScriptCheck(const CCoins& txFromIn, const CTransaction& txToIn, unsigned int nInIn, unsigned int nFlagsIn, int nHashTypeIn) : + scriptPubKey(txFromIn.vout[txToIn.vin[nInIn].prevout.n].scriptPubKey), + ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), nHashType(nHashTypeIn) { } + + bool operator()() const; + + void swap(CScriptCheck &check) { + scriptPubKey.swap(check.scriptPubKey); + std::swap(ptxTo, check.ptxTo); + std::swap(nIn, check.nIn); + std::swap(nFlags, check.nFlags); + std::swap(nHashType, check.nHashType); + } +}; /** A transaction with a merkle branch linking it to the block chain. */ class CMerkleTx : public CTransaction @@ -1067,11 +1141,101 @@ public: +/** Data structure that represents a partial merkle tree. + * + * It respresents a subset of the txid's of a known block, in a way that + * allows recovery of the list of txid's and the merkle root, in an + * authenticated way. + * + * The encoding works as follows: we traverse the tree in depth-first order, + * storing a bit for each traversed node, signifying whether the node is the + * parent of at least one matched leaf txid (or a matched txid itself). In + * case we are at the leaf level, or this bit is 0, its merkle node hash is + * stored, and its children are not explorer further. Otherwise, no hash is + * stored, but we recurse into both (or the only) child branch. During + * decoding, the same depth-first traversal is performed, consuming bits and + * hashes as they written during encoding. + * + * The serialization is fixed and provides a hard guarantee about the + * encoded size: + * + * SIZE <= 10 + ceil(32.25*N) + * + * Where N represents the number of leaf nodes of the partial tree. N itself + * is bounded by: + * + * N <= total_transactions + * N <= 1 + matched_transactions*tree_height + * + * The serialization format: + * - uint32 total_transactions (4 bytes) + * - varint number of hashes (1-3 bytes) + * - uint256[] hashes in depth-first order (<= 32*N bytes) + * - varint number of bytes of flag bits (1-3 bytes) + * - byte[] flag bits, packed per 8 in a byte, least significant bit first (<= 2*N-1 bits) + * The size constraints follow from this. + */ +class CPartialMerkleTree +{ +protected: + // the total number of transactions in the block + unsigned int nTransactions; + + // node-is-parent-of-matched-txid bits + std::vector<bool> vBits; + + // txids and internal hashes + std::vector<uint256> vHash; + + // flag set when encountering invalid data + bool fBad; + + // helper function to efficiently calculate the number of nodes at given height in the merkle tree + unsigned int CalcTreeWidth(int height) { + return (nTransactions+(1 << height)-1) >> height; + } + + // calculate the hash of a node in the merkle tree (at leaf level: the txid's themself) + uint256 CalcHash(int height, unsigned int pos, const std::vector<uint256> &vTxid); + + // recursive function that traverses tree nodes, storing the data as bits and hashes + void TraverseAndBuild(int height, unsigned int pos, const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch); + // recursive function that traverses tree nodes, consuming the bits and hashes produced by TraverseAndBuild. + // it returns the hash of the respective node. + uint256 TraverseAndExtract(int height, unsigned int pos, unsigned int &nBitsUsed, unsigned int &nHashUsed, std::vector<uint256> &vMatch); +public: + // serialization implementation + IMPLEMENT_SERIALIZE( + READWRITE(nTransactions); + READWRITE(vHash); + std::vector<unsigned char> vBytes; + if (fRead) { + READWRITE(vBytes); + CPartialMerkleTree &us = *(const_cast<CPartialMerkleTree*>(this)); + us.vBits.resize(vBytes.size() * 8); + for (unsigned int p = 0; p < us.vBits.size(); p++) + us.vBits[p] = (vBytes[p / 8] & (1 << (p % 8))) != 0; + us.fBad = false; + } else { + vBytes.resize((vBits.size()+7)/8); + for (unsigned int p = 0; p < vBits.size(); p++) + vBytes[p / 8] |= vBits[p] << (p % 8); + READWRITE(vBytes); + } + ) + // Construct a partial merkle tree from a list of transaction id's, and a mask that selects a subset of them + CPartialMerkleTree(const std::vector<uint256> &vTxid, const std::vector<bool> &vMatch); + CPartialMerkleTree(); + + // extract the matching txid's represented by this partial merkle tree. + // returns the merkle root, or 0 in case of failure + uint256 ExtractMatches(std::vector<uint256> &vMatch); +}; /** Nodes collect new transactions into a block, hash them into a hash tree, @@ -1175,6 +1339,18 @@ public: nDoS = 0; } + CBlockHeader GetBlockHeader() const + { + CBlockHeader block; + block.nVersion = nVersion; + block.hashPrevBlock = hashPrevBlock; + block.hashMerkleRoot = hashMerkleRoot; + block.nTime = nTime; + block.nBits = nBits; + block.nNonce = nNonce; + return block; + } + uint256 BuildMerkleTree() const { vMerkleTree.clear(); @@ -1231,7 +1407,6 @@ public: return hash; } - bool WriteToDisk(CDiskBlockPos &pos) { // Open history file to append @@ -1305,8 +1480,11 @@ public: } - // Undo the effects of this block (with given index) on the UTXO set represented by coins - bool DisconnectBlock(CBlockIndex *pindex, CCoinsViewCache &coins); + /** Undo the effects of this block (with given index) on the UTXO set represented by coins. + * In case pfClean is provided, operation will try to be tolerant about errors, and *pfClean + * will be true if no problems were found. Otherwise, the return value will be false in case + * of problems. Note that in any case, coins may be modified. */ + bool DisconnectBlock(CBlockIndex *pindex, CCoinsViewCache &coins, bool *pfClean = NULL); // Apply the effects of this block (with given index) on the UTXO set represented by coins bool ConnectBlock(CBlockIndex *pindex, CCoinsViewCache &coins, bool fJustCheck=false); @@ -1975,4 +2153,43 @@ extern CCoinsViewCache *pcoinsTip; /** Global variable that points to the active block tree (protected by cs_main) */ extern CBlockTreeDB *pblocktree; +struct CBlockTemplate +{ + CBlock block; + std::vector<int64_t> vTxFees; + std::vector<int64_t> vTxSigOps; +}; + + + + + + +/** Used to relay blocks as header + vector<merkle branch> + * to filtered nodes. + */ +class CMerkleBlock +{ +public: + // Public only for unit testing + CBlockHeader header; + CPartialMerkleTree txn; + +public: + // Public only for unit testing and relay testing + // (not relayed) + std::vector<std::pair<unsigned int, uint256> > vMatchedTxn; + + // Create from a CBlock, filtering transactions according to filter + // Note that this will call IsRelevantAndUpdate on the filter for each transaction, + // thus the filter will likely be modified. + CMerkleBlock(const CBlock& block, CBloomFilter& filter); + + IMPLEMENT_SERIALIZE + ( + READWRITE(header); + READWRITE(txn); + ) +}; + #endif |