1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2012 The Bitcoin developers
3 // Distributed under the MIT/X11 software license, see the accompanying
4 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
26 class CRequestTracker;
30 static const unsigned int MAX_BLOCK_SIZE = 1000000;
31 static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
32 static const int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
33 static const int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
34 static const int64 COIN = 100000000;
35 static const int64 CENT = 1000000;
36 static const int64 MIN_TX_FEE = 50000;
37 static const int64 MIN_RELAY_TX_FEE = 10000;
38 static const int64 MAX_MONEY = 21000000 * COIN;
39 inline bool MoneyRange(int64 nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
40 static const int COINBASE_MATURITY = 100;
41 // Threshold for nLockTime: below this value it is interpreted as block number, otherwise as UNIX timestamp.
42 static const int LOCKTIME_THRESHOLD = 500000000; // Tue Nov 5 00:53:20 1985 UTC
44 static const int fHaveUPnP = true;
46 static const int fHaveUPnP = false;
54 extern CCriticalSection cs_main;
55 extern std::map<uint256, CBlockIndex*> mapBlockIndex;
56 extern uint256 hashGenesisBlock;
57 extern CBlockIndex* pindexGenesisBlock;
58 extern int nBestHeight;
59 extern CBigNum bnBestChainWork;
60 extern CBigNum bnBestInvalidWork;
61 extern uint256 hashBestChain;
62 extern CBlockIndex* pindexBest;
63 extern unsigned int nTransactionsUpdated;
64 extern double dHashesPerSec;
65 extern int64 nHPSTimerStart;
66 extern int64 nTimeBestReceived;
67 extern CCriticalSection cs_setpwalletRegistered;
68 extern std::set<CWallet*> setpwalletRegistered;
71 extern int fGenerateBitcoins;
72 extern int64 nTransactionFee;
73 extern int fLimitProcessors;
74 extern int nLimitProcessors;
75 extern int fMinimizeToTray;
76 extern int fMinimizeOnClose;
87 void RegisterWallet(CWallet* pwalletIn);
88 void UnregisterWallet(CWallet* pwalletIn);
89 bool ProcessBlock(CNode* pfrom, CBlock* pblock);
90 bool CheckDiskSpace(uint64 nAdditionalBytes=0);
91 FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode="rb");
92 FILE* AppendBlockFile(unsigned int& nFileRet);
93 bool LoadBlockIndex(bool fAllowNew=true);
94 void PrintBlockTree();
95 bool ProcessMessages(CNode* pfrom);
96 bool SendMessages(CNode* pto, bool fSendTrickle);
97 void GenerateBitcoins(bool fGenerate, CWallet* pwallet);
98 CBlock* CreateNewBlock(CReserveKey& reservekey);
99 void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce);
100 void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1);
101 bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey);
102 bool CheckProofOfWork(uint256 hash, unsigned int nBits);
103 unsigned int ComputeMinWork(unsigned int nBase, int64 nTime);
104 int GetNumBlocksOfPeers();
105 bool IsInitialBlockDownload();
106 std::string GetWarnings(std::string strFor);
119 bool GetWalletFile(CWallet* pwallet, std::string &strWalletFileOut);
122 bool WriteSetting(const std::string& strKey, const T& value)
125 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
127 std::string strWalletFile;
128 if (!GetWalletFile(pwallet, strWalletFile))
130 fOk |= CWalletDB(strWalletFile).WriteSetting(strKey, value);
140 unsigned int nBlockPos;
148 CDiskTxPos(unsigned int nFileIn, unsigned int nBlockPosIn, unsigned int nTxPosIn)
151 nBlockPos = nBlockPosIn;
155 IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
156 void SetNull() { nFile = -1; nBlockPos = 0; nTxPos = 0; }
157 bool IsNull() const { return (nFile == -1); }
159 friend bool operator==(const CDiskTxPos& a, const CDiskTxPos& b)
161 return (a.nFile == b.nFile &&
162 a.nBlockPos == b.nBlockPos &&
163 a.nTxPos == b.nTxPos);
166 friend bool operator!=(const CDiskTxPos& a, const CDiskTxPos& b)
171 std::string ToString() const
174 return strprintf("null");
176 return strprintf("(nFile=%d, nBlockPos=%d, nTxPos=%d)", nFile, nBlockPos, nTxPos);
181 printf("%s", ToString().c_str());
194 CInPoint() { SetNull(); }
195 CInPoint(CTransaction* ptxIn, unsigned int nIn) { ptx = ptxIn; n = nIn; }
196 void SetNull() { ptx = NULL; n = -1; }
197 bool IsNull() const { return (ptx == NULL && n == -1); }
209 COutPoint() { SetNull(); }
210 COutPoint(uint256 hashIn, unsigned int nIn) { hash = hashIn; n = nIn; }
211 IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
212 void SetNull() { hash = 0; n = -1; }
213 bool IsNull() const { return (hash == 0 && n == -1); }
215 friend bool operator<(const COutPoint& a, const COutPoint& b)
217 return (a.hash < b.hash || (a.hash == b.hash && a.n < b.n));
220 friend bool operator==(const COutPoint& a, const COutPoint& b)
222 return (a.hash == b.hash && a.n == b.n);
225 friend bool operator!=(const COutPoint& a, const COutPoint& b)
230 std::string ToString() const
232 return strprintf("COutPoint(%s, %d)", hash.ToString().substr(0,10).c_str(), n);
237 printf("%s\n", ToString().c_str());
245 // An input of a transaction. It contains the location of the previous
246 // transaction's output that it claims and a signature that matches the
247 // output's public key.
254 unsigned int nSequence;
258 nSequence = UINT_MAX;
261 explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=UINT_MAX)
264 scriptSig = scriptSigIn;
265 nSequence = nSequenceIn;
268 CTxIn(uint256 hashPrevTx, unsigned int nOut, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=UINT_MAX)
270 prevout = COutPoint(hashPrevTx, nOut);
271 scriptSig = scriptSigIn;
272 nSequence = nSequenceIn;
278 READWRITE(scriptSig);
279 READWRITE(nSequence);
284 return (nSequence == UINT_MAX);
287 friend bool operator==(const CTxIn& a, const CTxIn& b)
289 return (a.prevout == b.prevout &&
290 a.scriptSig == b.scriptSig &&
291 a.nSequence == b.nSequence);
294 friend bool operator!=(const CTxIn& a, const CTxIn& b)
299 std::string ToString() const
302 str += strprintf("CTxIn(");
303 str += prevout.ToString();
304 if (prevout.IsNull())
305 str += strprintf(", coinbase %s", HexStr(scriptSig).c_str());
307 str += strprintf(", scriptSig=%s", scriptSig.ToString().substr(0,24).c_str());
308 if (nSequence != UINT_MAX)
309 str += strprintf(", nSequence=%u", nSequence);
316 printf("%s\n", ToString().c_str());
324 // An output of a transaction. It contains the public key that the next input
325 // must be able to sign with to claim it.
331 CScript scriptPubKey;
338 CTxOut(int64 nValueIn, CScript scriptPubKeyIn)
341 scriptPubKey = scriptPubKeyIn;
347 READWRITE(scriptPubKey);
353 scriptPubKey.clear();
358 return (nValue == -1);
361 uint256 GetHash() const
363 return SerializeHash(*this);
366 friend bool operator==(const CTxOut& a, const CTxOut& b)
368 return (a.nValue == b.nValue &&
369 a.scriptPubKey == b.scriptPubKey);
372 friend bool operator!=(const CTxOut& a, const CTxOut& b)
377 std::string ToString() const
379 if (scriptPubKey.size() < 6)
380 return "CTxOut(error)";
381 return strprintf("CTxOut(nValue=%"PRI64d".%08"PRI64d", scriptPubKey=%s)", nValue / COIN, nValue % COIN, scriptPubKey.ToString().substr(0,30).c_str());
386 printf("%s\n", ToString().c_str());
394 // The basic transaction that is broadcasted on the network and contained in
395 // blocks. A transaction can contain multiple inputs and outputs.
401 std::vector<CTxIn> vin;
402 std::vector<CTxOut> vout;
403 unsigned int nLockTime;
405 // Denial-of-service detection:
407 bool DoS(int nDoSIn, bool fIn) const { nDoS += nDoSIn; return fIn; }
416 READWRITE(this->nVersion);
417 nVersion = this->nVersion;
420 READWRITE(nLockTime);
429 nDoS = 0; // Denial-of-service prevention
434 return (vin.empty() && vout.empty());
437 uint256 GetHash() const
439 return SerializeHash(*this);
442 bool IsFinal(int nBlockHeight=0, int64 nBlockTime=0) const
444 // Time based nLockTime implemented in 0.1.6
447 if (nBlockHeight == 0)
448 nBlockHeight = nBestHeight;
450 nBlockTime = GetAdjustedTime();
451 if ((int64)nLockTime < (nLockTime < LOCKTIME_THRESHOLD ? (int64)nBlockHeight : nBlockTime))
453 BOOST_FOREACH(const CTxIn& txin, vin)
459 bool IsNewerThan(const CTransaction& old) const
461 if (vin.size() != old.vin.size())
463 for (int i = 0; i < vin.size(); i++)
464 if (vin[i].prevout != old.vin[i].prevout)
468 unsigned int nLowest = UINT_MAX;
469 for (int i = 0; i < vin.size(); i++)
471 if (vin[i].nSequence != old.vin[i].nSequence)
473 if (vin[i].nSequence <= nLowest)
476 nLowest = vin[i].nSequence;
478 if (old.vin[i].nSequence < nLowest)
481 nLowest = old.vin[i].nSequence;
488 bool IsCoinBase() const
490 return (vin.size() == 1 && vin[0].prevout.IsNull());
493 int GetSigOpCount() const
496 BOOST_FOREACH(const CTxIn& txin, vin)
497 n += txin.scriptSig.GetSigOpCount();
498 BOOST_FOREACH(const CTxOut& txout, vout)
499 n += txout.scriptPubKey.GetSigOpCount();
503 bool IsStandard() const
505 BOOST_FOREACH(const CTxIn& txin, vin)
506 if (!txin.scriptSig.IsPushOnly())
507 return error("nonstandard txin: %s", txin.scriptSig.ToString().c_str());
508 BOOST_FOREACH(const CTxOut& txout, vout)
509 if (!::IsStandard(txout.scriptPubKey))
510 return error("nonstandard txout: %s", txout.scriptPubKey.ToString().c_str());
514 int64 GetValueOut() const
517 BOOST_FOREACH(const CTxOut& txout, vout)
519 nValueOut += txout.nValue;
520 if (!MoneyRange(txout.nValue) || !MoneyRange(nValueOut))
521 throw std::runtime_error("CTransaction::GetValueOut() : value out of range");
526 static bool AllowFree(double dPriority)
528 // Large (in bytes) low-priority (new, small-coin) transactions
530 return dPriority > COIN * 144 / 250;
533 int64 GetMinFee(unsigned int nBlockSize=1, bool fAllowFree=true, bool fForRelay=false) const
535 // Base fee is either MIN_TX_FEE or MIN_RELAY_TX_FEE
536 int64 nBaseFee = fForRelay ? MIN_RELAY_TX_FEE : MIN_TX_FEE;
538 unsigned int nBytes = ::GetSerializeSize(*this, SER_NETWORK);
539 unsigned int nNewBlockSize = nBlockSize + nBytes;
540 int64 nMinFee = (1 + (int64)nBytes / 1000) * nBaseFee;
546 // Transactions under 10K are free
547 // (about 4500bc if made of 50bc inputs)
553 // Free transaction area
554 if (nNewBlockSize < 27000)
559 // To limit dust spam, require MIN_TX_FEE/MIN_RELAY_TX_FEE if any output is less than 0.01
560 if (nMinFee < nBaseFee)
561 BOOST_FOREACH(const CTxOut& txout, vout)
562 if (txout.nValue < CENT)
565 // Raise the price as the block approaches full
566 if (nBlockSize != 1 && nNewBlockSize >= MAX_BLOCK_SIZE_GEN/2)
568 if (nNewBlockSize >= MAX_BLOCK_SIZE_GEN)
570 nMinFee *= MAX_BLOCK_SIZE_GEN / (MAX_BLOCK_SIZE_GEN - nNewBlockSize);
573 if (!MoneyRange(nMinFee))
579 bool ReadFromDisk(CDiskTxPos pos, FILE** pfileRet=NULL)
581 CAutoFile filein = OpenBlockFile(pos.nFile, 0, pfileRet ? "rb+" : "rb");
583 return error("CTransaction::ReadFromDisk() : OpenBlockFile failed");
586 if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
587 return error("CTransaction::ReadFromDisk() : fseek failed");
590 // Return file pointer
593 if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
594 return error("CTransaction::ReadFromDisk() : second fseek failed");
595 *pfileRet = filein.release();
600 friend bool operator==(const CTransaction& a, const CTransaction& b)
602 return (a.nVersion == b.nVersion &&
605 a.nLockTime == b.nLockTime);
608 friend bool operator!=(const CTransaction& a, const CTransaction& b)
614 std::string ToString() const
617 str += strprintf("CTransaction(hash=%s, ver=%d, vin.size=%d, vout.size=%d, nLockTime=%d)\n",
618 GetHash().ToString().substr(0,10).c_str(),
623 for (int i = 0; i < vin.size(); i++)
624 str += " " + vin[i].ToString() + "\n";
625 for (int i = 0; i < vout.size(); i++)
626 str += " " + vout[i].ToString() + "\n";
632 printf("%s", ToString().c_str());
636 bool ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet);
637 bool ReadFromDisk(CTxDB& txdb, COutPoint prevout);
638 bool ReadFromDisk(COutPoint prevout);
639 bool DisconnectInputs(CTxDB& txdb);
640 bool ConnectInputs(CTxDB& txdb, std::map<uint256, CTxIndex>& mapTestPool, CDiskTxPos posThisTx,
641 CBlockIndex* pindexBlock, int64& nFees, bool fBlock, bool fMiner, int64 nMinFee,
643 bool ClientConnectInputs();
644 bool CheckTransaction() const;
645 bool AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs=true, bool* pfMissingInputs=NULL);
646 bool AcceptToMemoryPool(bool fCheckInputs=true, bool* pfMissingInputs=NULL);
648 bool AddToMemoryPoolUnchecked();
650 bool RemoveFromMemoryPool();
658 // A transaction with a merkle branch linking it to the block chain
660 class CMerkleTx : public CTransaction
664 std::vector<uint256> vMerkleBranch;
668 mutable char fMerkleVerified;
676 CMerkleTx(const CTransaction& txIn) : CTransaction(txIn)
685 fMerkleVerified = false;
691 nSerSize += SerReadWrite(s, *(CTransaction*)this, nType, nVersion, ser_action);
692 nVersion = this->nVersion;
693 READWRITE(hashBlock);
694 READWRITE(vMerkleBranch);
699 int SetMerkleBranch(const CBlock* pblock=NULL);
700 int GetDepthInMainChain(int& nHeightRet) const;
701 int GetDepthInMainChain() const { int nHeight; return GetDepthInMainChain(nHeight); }
702 bool IsInMainChain() const { return GetDepthInMainChain() > 0; }
703 int GetBlocksToMaturity() const;
704 bool AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs=true);
705 bool AcceptToMemoryPool();
712 // A txdb record that contains the disk location of a transaction and the
713 // locations of transactions that spend its outputs. vSpent is really only
714 // used as a flag, but having the location is very helpful for debugging.
720 std::vector<CDiskTxPos> vSpent;
727 CTxIndex(const CDiskTxPos& posIn, unsigned int nOutputs)
730 vSpent.resize(nOutputs);
735 if (!(nType & SER_GETHASH))
752 friend bool operator==(const CTxIndex& a, const CTxIndex& b)
754 return (a.pos == b.pos &&
755 a.vSpent == b.vSpent);
758 friend bool operator!=(const CTxIndex& a, const CTxIndex& b)
762 int GetDepthInMainChain() const;
770 // Nodes collect new transactions into a block, hash them into a hash tree,
771 // and scan through nonce values to make the block's hash satisfy proof-of-work
772 // requirements. When they solve the proof-of-work, they broadcast the block
773 // to everyone and the block is added to the block chain. The first transaction
774 // in the block is a special one that creates a new coin owned by the creator
777 // Blocks are appended to blk0001.dat files on disk. Their location on disk
778 // is indexed by CBlockIndex objects in memory.
785 uint256 hashPrevBlock;
786 uint256 hashMerkleRoot;
792 std::vector<CTransaction> vtx;
795 mutable std::vector<uint256> vMerkleTree;
797 // Denial-of-service detection:
799 bool DoS(int nDoSIn, bool fIn) const { nDoS += nDoSIn; return fIn; }
808 READWRITE(this->nVersion);
809 nVersion = this->nVersion;
810 READWRITE(hashPrevBlock);
811 READWRITE(hashMerkleRoot);
816 // ConnectBlock depends on vtx being last so it can calculate offset
817 if (!(nType & (SER_GETHASH|SER_BLOCKHEADERONLY)))
820 const_cast<CBlock*>(this)->vtx.clear();
841 uint256 GetHash() const
843 return Hash(BEGIN(nVersion), END(nNonce));
846 int64 GetBlockTime() const
851 int GetSigOpCount() const
854 BOOST_FOREACH(const CTransaction& tx, vtx)
855 n += tx.GetSigOpCount();
860 uint256 BuildMerkleTree() const
863 BOOST_FOREACH(const CTransaction& tx, vtx)
864 vMerkleTree.push_back(tx.GetHash());
866 for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
868 for (int i = 0; i < nSize; i += 2)
870 int i2 = std::min(i+1, nSize-1);
871 vMerkleTree.push_back(Hash(BEGIN(vMerkleTree[j+i]), END(vMerkleTree[j+i]),
872 BEGIN(vMerkleTree[j+i2]), END(vMerkleTree[j+i2])));
876 return (vMerkleTree.empty() ? 0 : vMerkleTree.back());
879 std::vector<uint256> GetMerkleBranch(int nIndex) const
881 if (vMerkleTree.empty())
883 std::vector<uint256> vMerkleBranch;
885 for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
887 int i = std::min(nIndex^1, nSize-1);
888 vMerkleBranch.push_back(vMerkleTree[j+i]);
892 return vMerkleBranch;
895 static uint256 CheckMerkleBranch(uint256 hash, const std::vector<uint256>& vMerkleBranch, int nIndex)
899 BOOST_FOREACH(const uint256& otherside, vMerkleBranch)
902 hash = Hash(BEGIN(otherside), END(otherside), BEGIN(hash), END(hash));
904 hash = Hash(BEGIN(hash), END(hash), BEGIN(otherside), END(otherside));
911 bool WriteToDisk(unsigned int& nFileRet, unsigned int& nBlockPosRet)
913 // Open history file to append
914 CAutoFile fileout = AppendBlockFile(nFileRet);
916 return error("CBlock::WriteToDisk() : AppendBlockFile failed");
918 // Write index header
919 unsigned int nSize = fileout.GetSerializeSize(*this);
920 fileout << FLATDATA(pchMessageStart) << nSize;
923 nBlockPosRet = ftell(fileout);
924 if (nBlockPosRet == -1)
925 return error("CBlock::WriteToDisk() : ftell failed");
928 // Flush stdio buffers and commit to disk before returning
930 if (!IsInitialBlockDownload() || (nBestHeight+1) % 500 == 0)
933 _commit(_fileno(fileout));
935 fsync(fileno(fileout));
942 bool ReadFromDisk(unsigned int nFile, unsigned int nBlockPos, bool fReadTransactions=true)
946 // Open history file to read
947 CAutoFile filein = OpenBlockFile(nFile, nBlockPos, "rb");
949 return error("CBlock::ReadFromDisk() : OpenBlockFile failed");
950 if (!fReadTransactions)
951 filein.nType |= SER_BLOCKHEADERONLY;
957 if (!CheckProofOfWork(GetHash(), nBits))
958 return error("CBlock::ReadFromDisk() : errors in block header");
967 printf("CBlock(hash=%s, ver=%d, hashPrevBlock=%s, hashMerkleRoot=%s, nTime=%u, nBits=%08x, nNonce=%u, vtx=%d)\n",
968 GetHash().ToString().substr(0,20).c_str(),
970 hashPrevBlock.ToString().substr(0,20).c_str(),
971 hashMerkleRoot.ToString().substr(0,10).c_str(),
972 nTime, nBits, nNonce,
974 for (int i = 0; i < vtx.size(); i++)
979 printf(" vMerkleTree: ");
980 for (int i = 0; i < vMerkleTree.size(); i++)
981 printf("%s ", vMerkleTree[i].ToString().substr(0,10).c_str());
986 bool DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex);
987 bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex);
988 bool ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions=true);
989 bool SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew);
990 bool AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos);
991 bool CheckBlock() const;
1001 // The block chain is a tree shaped structure starting with the
1002 // genesis block at the root, with each block potentially having multiple
1003 // candidates to be the next block. pprev and pnext link a path through the
1004 // main/longest chain. A blockindex may have multiple pprev pointing back
1005 // to it, but pnext will only point forward to the longest branch, or will
1006 // be null if the block is not part of the longest chain.
1011 const uint256* phashBlock;
1015 unsigned int nBlockPos;
1017 CBigNum bnChainWork;
1021 uint256 hashMerkleRoot;
1024 unsigned int nNonce;
1044 CBlockIndex(unsigned int nFileIn, unsigned int nBlockPosIn, CBlock& block)
1050 nBlockPos = nBlockPosIn;
1054 nVersion = block.nVersion;
1055 hashMerkleRoot = block.hashMerkleRoot;
1056 nTime = block.nTime;
1057 nBits = block.nBits;
1058 nNonce = block.nNonce;
1061 CBlock GetBlockHeader() const
1064 block.nVersion = nVersion;
1066 block.hashPrevBlock = pprev->GetBlockHash();
1067 block.hashMerkleRoot = hashMerkleRoot;
1068 block.nTime = nTime;
1069 block.nBits = nBits;
1070 block.nNonce = nNonce;
1074 uint256 GetBlockHash() const
1079 int64 GetBlockTime() const
1081 return (int64)nTime;
1084 CBigNum GetBlockWork() const
1087 bnTarget.SetCompact(nBits);
1090 return (CBigNum(1)<<256) / (bnTarget+1);
1093 bool IsInMainChain() const
1095 return (pnext || this == pindexBest);
1098 bool CheckIndex() const
1100 return CheckProofOfWork(GetBlockHash(), nBits);
1103 bool EraseBlockFromDisk()
1105 // Open history file
1106 CAutoFile fileout = OpenBlockFile(nFile, nBlockPos, "rb+");
1110 // Overwrite with empty null block
1118 enum { nMedianTimeSpan=11 };
1120 int64 GetMedianTimePast() const
1122 int64 pmedian[nMedianTimeSpan];
1123 int64* pbegin = &pmedian[nMedianTimeSpan];
1124 int64* pend = &pmedian[nMedianTimeSpan];
1126 const CBlockIndex* pindex = this;
1127 for (int i = 0; i < nMedianTimeSpan && pindex; i++, pindex = pindex->pprev)
1128 *(--pbegin) = pindex->GetBlockTime();
1130 std::sort(pbegin, pend);
1131 return pbegin[(pend - pbegin)/2];
1134 int64 GetMedianTime() const
1136 const CBlockIndex* pindex = this;
1137 for (int i = 0; i < nMedianTimeSpan/2; i++)
1140 return GetBlockTime();
1141 pindex = pindex->pnext;
1143 return pindex->GetMedianTimePast();
1148 std::string ToString() const
1150 return strprintf("CBlockIndex(nprev=%08x, pnext=%08x, nFile=%d, nBlockPos=%-6d nHeight=%d, merkle=%s, hashBlock=%s)",
1151 pprev, pnext, nFile, nBlockPos, nHeight,
1152 hashMerkleRoot.ToString().substr(0,10).c_str(),
1153 GetBlockHash().ToString().substr(0,20).c_str());
1158 printf("%s\n", ToString().c_str());
1165 // Used to marshal pointers into hashes for db storage.
1167 class CDiskBlockIndex : public CBlockIndex
1179 explicit CDiskBlockIndex(CBlockIndex* pindex) : CBlockIndex(*pindex)
1181 hashPrev = (pprev ? pprev->GetBlockHash() : 0);
1182 hashNext = (pnext ? pnext->GetBlockHash() : 0);
1187 if (!(nType & SER_GETHASH))
1188 READWRITE(nVersion);
1190 READWRITE(hashNext);
1192 READWRITE(nBlockPos);
1196 READWRITE(this->nVersion);
1197 READWRITE(hashPrev);
1198 READWRITE(hashMerkleRoot);
1204 uint256 GetBlockHash() const
1207 block.nVersion = nVersion;
1208 block.hashPrevBlock = hashPrev;
1209 block.hashMerkleRoot = hashMerkleRoot;
1210 block.nTime = nTime;
1211 block.nBits = nBits;
1212 block.nNonce = nNonce;
1213 return block.GetHash();
1217 std::string ToString() const
1219 std::string str = "CDiskBlockIndex(";
1220 str += CBlockIndex::ToString();
1221 str += strprintf("\n hashBlock=%s, hashPrev=%s, hashNext=%s)",
1222 GetBlockHash().ToString().c_str(),
1223 hashPrev.ToString().substr(0,20).c_str(),
1224 hashNext.ToString().substr(0,20).c_str());
1230 printf("%s\n", ToString().c_str());
1242 // Describes a place in the block chain to another node such that if the
1243 // other node doesn't have the same branch, it can find a recent common trunk.
1244 // The further back it is, the further before the fork it may be.
1249 std::vector<uint256> vHave;
1256 explicit CBlockLocator(const CBlockIndex* pindex)
1261 explicit CBlockLocator(uint256 hashBlock)
1263 std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
1264 if (mi != mapBlockIndex.end())
1270 if (!(nType & SER_GETHASH))
1271 READWRITE(nVersion);
1282 return vHave.empty();
1285 void Set(const CBlockIndex* pindex)
1291 vHave.push_back(pindex->GetBlockHash());
1293 // Exponentially larger steps back
1294 for (int i = 0; pindex && i < nStep; i++)
1295 pindex = pindex->pprev;
1296 if (vHave.size() > 10)
1299 vHave.push_back(hashGenesisBlock);
1302 int GetDistanceBack()
1304 // Retrace how far back it was in the sender's branch
1307 BOOST_FOREACH(const uint256& hash, vHave)
1309 std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
1310 if (mi != mapBlockIndex.end())
1312 CBlockIndex* pindex = (*mi).second;
1313 if (pindex->IsInMainChain())
1323 CBlockIndex* GetBlockIndex()
1325 // Find the first block the caller has in the main chain
1326 BOOST_FOREACH(const uint256& hash, vHave)
1328 std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
1329 if (mi != mapBlockIndex.end())
1331 CBlockIndex* pindex = (*mi).second;
1332 if (pindex->IsInMainChain())
1336 return pindexGenesisBlock;
1339 uint256 GetBlockHash()
1341 // Find the first block the caller has in the main chain
1342 BOOST_FOREACH(const uint256& hash, vHave)
1344 std::map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
1345 if (mi != mapBlockIndex.end())
1347 CBlockIndex* pindex = (*mi).second;
1348 if (pindex->IsInMainChain())
1352 return hashGenesisBlock;
1357 CBlockIndex* pindex = GetBlockIndex();
1360 return pindex->nHeight;
1373 // Alerts are for notifying old versions if they become too obsolete and
1374 // need to upgrade. The message is displayed in the status bar.
1375 // Alert messages are broadcast as a vector of signed data. Unserializing may
1376 // not read the entire buffer if the alert is for a newer version, but older
1377 // versions can still relay the original data.
1379 class CUnsignedAlert
1383 int64 nRelayUntil; // when newer nodes stop relaying to newer nodes
1387 std::set<int> setCancel;
1388 int nMinVer; // lowest version inclusive
1389 int nMaxVer; // highest version inclusive
1390 std::set<std::string> setSubVer; // empty matches all
1394 std::string strComment;
1395 std::string strStatusBar;
1396 std::string strReserved;
1400 READWRITE(this->nVersion);
1401 nVersion = this->nVersion;
1402 READWRITE(nRelayUntil);
1403 READWRITE(nExpiration);
1406 READWRITE(setCancel);
1409 READWRITE(setSubVer);
1410 READWRITE(nPriority);
1412 READWRITE(strComment);
1413 READWRITE(strStatusBar);
1414 READWRITE(strReserved);
1431 strStatusBar.clear();
1432 strReserved.clear();
1435 std::string ToString() const
1437 std::string strSetCancel;
1438 BOOST_FOREACH(int n, setCancel)
1439 strSetCancel += strprintf("%d ", n);
1440 std::string strSetSubVer;
1441 BOOST_FOREACH(std::string str, setSubVer)
1442 strSetSubVer += "\"" + str + "\" ";
1446 " nRelayUntil = %"PRI64d"\n"
1447 " nExpiration = %"PRI64d"\n"
1455 " strComment = \"%s\"\n"
1456 " strStatusBar = \"%s\"\n"
1463 strSetCancel.c_str(),
1466 strSetSubVer.c_str(),
1469 strStatusBar.c_str());
1474 printf("%s", ToString().c_str());
1478 class CAlert : public CUnsignedAlert
1481 std::vector<unsigned char> vchMsg;
1482 std::vector<unsigned char> vchSig;
1497 CUnsignedAlert::SetNull();
1504 return (nExpiration == 0);
1507 uint256 GetHash() const
1509 return SerializeHash(*this);
1512 bool IsInEffect() const
1514 return (GetAdjustedTime() < nExpiration);
1517 bool Cancels(const CAlert& alert) const
1520 return false; // this was a no-op before 31403
1521 return (alert.nID <= nCancel || setCancel.count(alert.nID));
1524 bool AppliesTo(int nVersion, std::string strSubVerIn) const
1526 return (IsInEffect() &&
1527 nMinVer <= nVersion && nVersion <= nMaxVer &&
1528 (setSubVer.empty() || setSubVer.count(strSubVerIn)));
1531 bool AppliesToMe() const
1533 return AppliesTo(VERSION, ::pszSubVer);
1536 bool RelayTo(CNode* pnode) const
1540 // returns true if wasn't already contained in the set
1541 if (pnode->setKnown.insert(GetHash()).second)
1543 if (AppliesTo(pnode->nVersion, pnode->strSubVer) ||
1545 GetAdjustedTime() < nRelayUntil)
1547 pnode->PushMessage("alert", *this);
1554 bool CheckSignature()
1557 if (!key.SetPubKey(ParseHex("04fc9702847840aaf195de8442ebecedf5b095cdbb9bc716bda9110971b28a49e0ead8564ff0db22209e0374782c093bb899692d524e9d6a6956e7c5ecbcd68284")))
1558 return error("CAlert::CheckSignature() : SetPubKey failed");
1559 if (!key.Verify(Hash(vchMsg.begin(), vchMsg.end()), vchSig))
1560 return error("CAlert::CheckSignature() : verify signature failed");
1562 // Now unserialize the data
1563 CDataStream sMsg(vchMsg);
1564 sMsg >> *(CUnsignedAlert*)this;
1568 bool ProcessAlert();