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.
6 #include "checkpoints.h"
10 #include "cryptopp/sha.h"
11 #include <boost/filesystem.hpp>
12 #include <boost/filesystem/fstream.hpp>
15 using namespace boost;
21 CCriticalSection cs_setpwalletRegistered;
22 set<CWallet*> setpwalletRegistered;
24 CCriticalSection cs_main;
26 static map<uint256, CTransaction> mapTransactions;
27 CCriticalSection cs_mapTransactions;
28 unsigned int nTransactionsUpdated = 0;
29 map<COutPoint, CInPoint> mapNextTx;
31 map<uint256, CBlockIndex*> mapBlockIndex;
32 uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f");
33 static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
34 const int nInitialBlockThreshold = 120; // Regard blocks up until N-threshold as "initial download"
35 CBlockIndex* pindexGenesisBlock = NULL;
37 CBigNum bnBestChainWork = 0;
38 CBigNum bnBestInvalidWork = 0;
39 uint256 hashBestChain = 0;
40 CBlockIndex* pindexBest = NULL;
41 int64 nTimeBestReceived = 0;
43 map<uint256, CBlock*> mapOrphanBlocks;
44 multimap<uint256, CBlock*> mapOrphanBlocksByPrev;
46 map<uint256, CDataStream*> mapOrphanTransactions;
47 multimap<uint256, CDataStream*> mapOrphanTransactionsByPrev;
54 int fGenerateBitcoins = false;
55 int64 nTransactionFee = 0;
56 int fLimitProcessors = false;
57 int nLimitProcessors = 1;
58 int fMinimizeToTray = true;
59 int fMinimizeOnClose = true;
72 //////////////////////////////////////////////////////////////////////////////
74 // dispatching functions
77 void RegisterWallet(CWallet* pwalletIn)
79 CRITICAL_BLOCK(cs_setpwalletRegistered)
81 setpwalletRegistered.insert(pwalletIn);
85 void UnregisterWallet(CWallet* pwalletIn)
87 CRITICAL_BLOCK(cs_setpwalletRegistered)
89 setpwalletRegistered.erase(pwalletIn);
93 bool static IsFromMe(CTransaction& tx)
95 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
96 if (pwallet->IsFromMe(tx))
101 bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
103 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
104 if (pwallet->GetTransaction(hashTx,wtx))
109 void static EraseFromWallets(uint256 hash)
111 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
112 pwallet->EraseFromWallet(hash);
115 void static SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL, bool fUpdate = false)
117 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
118 pwallet->AddToWalletIfInvolvingMe(tx, pblock, fUpdate);
121 void static SetBestChain(const CBlockLocator& loc)
123 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
124 pwallet->SetBestChain(loc);
127 void static UpdatedTransaction(const uint256& hashTx)
129 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
130 pwallet->UpdatedTransaction(hashTx);
133 void static PrintWallets(const CBlock& block)
135 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
136 pwallet->PrintWallet(block);
139 void static Inventory(const uint256& hash)
141 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
142 pwallet->Inventory(hash);
145 void static ResendWalletTransactions()
147 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
148 pwallet->ResendWalletTransactions();
157 //////////////////////////////////////////////////////////////////////////////
159 // mapOrphanTransactions
162 void AddOrphanTx(const CDataStream& vMsg)
165 CDataStream(vMsg) >> tx;
166 uint256 hash = tx.GetHash();
167 if (mapOrphanTransactions.count(hash))
170 CDataStream* pvMsg = mapOrphanTransactions[hash] = new CDataStream(vMsg);
171 BOOST_FOREACH(const CTxIn& txin, tx.vin)
172 mapOrphanTransactionsByPrev.insert(make_pair(txin.prevout.hash, pvMsg));
175 void static EraseOrphanTx(uint256 hash)
177 if (!mapOrphanTransactions.count(hash))
179 const CDataStream* pvMsg = mapOrphanTransactions[hash];
181 CDataStream(*pvMsg) >> tx;
182 BOOST_FOREACH(const CTxIn& txin, tx.vin)
184 for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(txin.prevout.hash);
185 mi != mapOrphanTransactionsByPrev.upper_bound(txin.prevout.hash);)
187 if ((*mi).second == pvMsg)
188 mapOrphanTransactionsByPrev.erase(mi++);
194 mapOrphanTransactions.erase(hash);
197 int LimitOrphanTxSize(int nMaxOrphans)
200 while (mapOrphanTransactions.size() > nMaxOrphans)
202 // Evict a random orphan:
203 std::vector<unsigned char> randbytes(32);
204 RAND_bytes(&randbytes[0], 32);
205 uint256 randomhash(randbytes);
206 map<uint256, CDataStream*>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
207 if (it == mapOrphanTransactions.end())
208 it = mapOrphanTransactions.begin();
209 EraseOrphanTx(it->first);
221 //////////////////////////////////////////////////////////////////////////////
223 // CTransaction and CTxIndex
226 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet)
229 if (!txdb.ReadTxIndex(prevout.hash, txindexRet))
231 if (!ReadFromDisk(txindexRet.pos))
233 if (prevout.n >= vout.size())
241 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout)
244 return ReadFromDisk(txdb, prevout, txindex);
247 bool CTransaction::ReadFromDisk(COutPoint prevout)
251 return ReadFromDisk(txdb, prevout, txindex);
256 int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
268 // Load the block this tx is in
270 if (!CTxDB("r").ReadTxIndex(GetHash(), txindex))
272 if (!blockTmp.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos))
277 // Update the tx's hashBlock
278 hashBlock = pblock->GetHash();
280 // Locate the transaction
281 for (nIndex = 0; nIndex < pblock->vtx.size(); nIndex++)
282 if (pblock->vtx[nIndex] == *(CTransaction*)this)
284 if (nIndex == pblock->vtx.size())
286 vMerkleBranch.clear();
288 printf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
292 // Fill in merkle branch
293 vMerkleBranch = pblock->GetMerkleBranch(nIndex);
296 // Is the tx in a block that's in the main chain
297 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
298 if (mi == mapBlockIndex.end())
300 CBlockIndex* pindex = (*mi).second;
301 if (!pindex || !pindex->IsInMainChain())
304 return pindexBest->nHeight - pindex->nHeight + 1;
313 bool CTransaction::CheckTransaction() const
315 // Basic checks that don't depend on any context
317 return error("CTransaction::CheckTransaction() : vin empty");
319 return error("CTransaction::CheckTransaction() : vout empty");
321 if (::GetSerializeSize(*this, SER_NETWORK) > MAX_BLOCK_SIZE)
322 return error("CTransaction::CheckTransaction() : size limits failed");
324 // Check for negative or overflow output values
326 BOOST_FOREACH(const CTxOut& txout, vout)
328 if (txout.nValue < 0)
329 return error("CTransaction::CheckTransaction() : txout.nValue negative");
330 if (txout.nValue > MAX_MONEY)
331 return error("CTransaction::CheckTransaction() : txout.nValue too high");
332 nValueOut += txout.nValue;
333 if (!MoneyRange(nValueOut))
334 return error("CTransaction::CheckTransaction() : txout total out of range");
337 // Check for duplicate inputs
338 set<COutPoint> vInOutPoints;
339 BOOST_FOREACH(const CTxIn& txin, vin)
341 if (vInOutPoints.count(txin.prevout))
343 vInOutPoints.insert(txin.prevout);
348 if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
349 return error("CTransaction::CheckTransaction() : coinbase script size");
353 BOOST_FOREACH(const CTxIn& txin, vin)
354 if (txin.prevout.IsNull())
355 return error("CTransaction::CheckTransaction() : prevout is null");
361 bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMissingInputs)
364 *pfMissingInputs = false;
366 if (!CheckTransaction())
367 return error("AcceptToMemoryPool() : CheckTransaction failed");
369 // Coinbase is only valid in a block, not as a loose transaction
371 return error("AcceptToMemoryPool() : coinbase as individual tx");
373 // To help v0.1.5 clients who would see it as a negative number
374 if ((int64)nLockTime > INT_MAX)
375 return error("AcceptToMemoryPool() : not accepting nLockTime beyond 2038 yet");
377 // Rather not work on nonstandard transactions (unless -testnet)
378 if (!fTestNet && !IsStandard())
379 return error("AcceptToMemoryPool() : nonstandard transaction type");
381 // Do we already have it?
382 uint256 hash = GetHash();
383 CRITICAL_BLOCK(cs_mapTransactions)
384 if (mapTransactions.count(hash))
387 if (txdb.ContainsTx(hash))
390 // Check for conflicts with in-memory transactions
391 CTransaction* ptxOld = NULL;
392 for (unsigned int i = 0; i < vin.size(); i++)
394 COutPoint outpoint = vin[i].prevout;
395 if (mapNextTx.count(outpoint))
397 // Disable replacement feature for now
400 // Allow replacing with a newer version of the same transaction
403 ptxOld = mapNextTx[outpoint].ptx;
404 if (ptxOld->IsFinal())
406 if (!IsNewerThan(*ptxOld))
408 for (unsigned int i = 0; i < vin.size(); i++)
410 COutPoint outpoint = vin[i].prevout;
411 if (!mapNextTx.count(outpoint) || mapNextTx[outpoint].ptx != ptxOld)
421 map<uint256, CTxIndex> mapUnused;
422 bool fInvalid = false;
423 if (!FetchInputs(txdb, mapUnused, false, false, mapInputs, fInvalid))
426 return error("AcceptToMemoryPool() : FetchInputs found invalid tx %s", hash.ToString().substr(0,10).c_str());
428 *pfMissingInputs = true;
429 return error("AcceptToMemoryPool() : FetchInputs failed %s", hash.ToString().substr(0,10).c_str());
433 unsigned int nSize = ::GetSerializeSize(*this, SER_NETWORK);
434 // Checking ECDSA signatures is a CPU bottleneck, so to avoid denial-of-service
435 // attacks disallow transactions with more than one SigOp per 34 bytes.
436 // 34 bytes because a TxOut is:
437 // 20-byte address + 8 byte bitcoin amount + 5 bytes of ops + 1 byte script length
438 if (GetSigOpCount() > nSize / 34 || nSize < 100)
439 return error("AcceptToMemoryPool() : nonstandard transaction");
441 int64 nFees = GetValueIn(mapInputs)-GetValueOut();
443 // Don't accept it if it can't get into a block
444 if (nFees < GetMinFee(1000, true, true))
445 return error("AcceptToMemoryPool() : not enough fees");
447 // Continuously rate-limit free transactions
448 // This mitigates 'penny-flooding' -- sending thousands of free transactions just to
449 // be annoying or make other's transactions take longer to confirm.
450 if (nFees < MIN_RELAY_TX_FEE)
452 static CCriticalSection cs;
453 static double dFreeCount;
454 static int64 nLastTime;
455 int64 nNow = GetTime();
459 // Use an exponentially decaying ~10-minute window:
460 dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
462 // -limitfreerelay unit is thousand-bytes-per-minute
463 // At default rate it would take over a month to fill 1GB
464 if (dFreeCount > GetArg("-limitfreerelay", 15)*10*1000 && !IsFromMe(*this))
465 return error("AcceptToMemoryPool() : free transaction rejected by rate limiter");
467 printf("Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
472 // Check against previous transactions
473 // This is done last to help prevent CPU exhaustion denial-of-service attacks.
474 if (!ConnectInputs(mapInputs, mapUnused, CDiskTxPos(1,1,1), pindexBest, false, false))
476 return error("AcceptToMemoryPool() : ConnectInputs failed %s", hash.ToString().substr(0,10).c_str());
480 // Store transaction in memory
481 CRITICAL_BLOCK(cs_mapTransactions)
485 printf("AcceptToMemoryPool() : replacing tx %s with new version\n", ptxOld->GetHash().ToString().c_str());
486 ptxOld->RemoveFromMemoryPool();
488 AddToMemoryPoolUnchecked();
491 ///// are we sure this is ok when loading transactions or restoring block txes
492 // If updated, erase old tx from wallet
494 EraseFromWallets(ptxOld->GetHash());
496 printf("AcceptToMemoryPool(): accepted %s\n", hash.ToString().substr(0,10).c_str());
500 bool CTransaction::AcceptToMemoryPool(bool fCheckInputs, bool* pfMissingInputs)
503 return AcceptToMemoryPool(txdb, fCheckInputs, pfMissingInputs);
506 bool CTransaction::AddToMemoryPoolUnchecked()
508 // Add to memory pool without checking anything. Don't call this directly,
509 // call AcceptToMemoryPool to properly check the transaction first.
510 CRITICAL_BLOCK(cs_mapTransactions)
512 uint256 hash = GetHash();
513 mapTransactions[hash] = *this;
514 for (unsigned int i = 0; i < vin.size(); i++)
515 mapNextTx[vin[i].prevout] = CInPoint(&mapTransactions[hash], i);
516 nTransactionsUpdated++;
522 bool CTransaction::RemoveFromMemoryPool()
524 // Remove transaction from memory pool
525 CRITICAL_BLOCK(cs_mapTransactions)
527 BOOST_FOREACH(const CTxIn& txin, vin)
528 mapNextTx.erase(txin.prevout);
529 mapTransactions.erase(GetHash());
530 nTransactionsUpdated++;
540 int CMerkleTx::GetDepthInMainChain(int& nHeightRet) const
542 if (hashBlock == 0 || nIndex == -1)
545 // Find the block it claims to be in
546 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
547 if (mi == mapBlockIndex.end())
549 CBlockIndex* pindex = (*mi).second;
550 if (!pindex || !pindex->IsInMainChain())
553 // Make sure the merkle branch connects to this block
554 if (!fMerkleVerified)
556 if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != pindex->hashMerkleRoot)
558 fMerkleVerified = true;
561 nHeightRet = pindex->nHeight;
562 return pindexBest->nHeight - pindex->nHeight + 1;
566 int CMerkleTx::GetBlocksToMaturity() const
570 return max(0, (COINBASE_MATURITY+20) - GetDepthInMainChain());
574 bool CMerkleTx::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs)
578 if (!IsInMainChain() && !ClientConnectInputs())
580 return CTransaction::AcceptToMemoryPool(txdb, false);
584 return CTransaction::AcceptToMemoryPool(txdb, fCheckInputs);
588 bool CMerkleTx::AcceptToMemoryPool()
591 return AcceptToMemoryPool(txdb);
596 bool CWalletTx::AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs)
598 CRITICAL_BLOCK(cs_mapTransactions)
600 // Add previous supporting transactions first
601 BOOST_FOREACH(CMerkleTx& tx, vtxPrev)
603 if (!tx.IsCoinBase())
605 uint256 hash = tx.GetHash();
606 if (!mapTransactions.count(hash) && !txdb.ContainsTx(hash))
607 tx.AcceptToMemoryPool(txdb, fCheckInputs);
610 return AcceptToMemoryPool(txdb, fCheckInputs);
615 bool CWalletTx::AcceptWalletTransaction()
618 return AcceptWalletTransaction(txdb);
621 int CTxIndex::GetDepthInMainChain() const
625 if (!block.ReadFromDisk(pos.nFile, pos.nBlockPos, false))
627 // Find the block in the index
628 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(block.GetHash());
629 if (mi == mapBlockIndex.end())
631 CBlockIndex* pindex = (*mi).second;
632 if (!pindex || !pindex->IsInMainChain())
634 return 1 + nBestHeight - pindex->nHeight;
646 //////////////////////////////////////////////////////////////////////////////
648 // CBlock and CBlockIndex
651 bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
653 if (!fReadTransactions)
655 *this = pindex->GetBlockHeader();
658 if (!ReadFromDisk(pindex->nFile, pindex->nBlockPos, fReadTransactions))
660 if (GetHash() != pindex->GetBlockHash())
661 return error("CBlock::ReadFromDisk() : GetHash() doesn't match index");
665 uint256 static GetOrphanRoot(const CBlock* pblock)
667 // Work back to the first block in the orphan chain
668 while (mapOrphanBlocks.count(pblock->hashPrevBlock))
669 pblock = mapOrphanBlocks[pblock->hashPrevBlock];
670 return pblock->GetHash();
673 int64 static GetBlockValue(int nHeight, int64 nFees)
675 int64 nSubsidy = 50 * COIN;
677 // Subsidy is cut in half every 4 years
678 nSubsidy >>= (nHeight / 210000);
680 return nSubsidy + nFees;
683 static const int64 nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
684 static const int64 nTargetSpacing = 10 * 60;
685 static const int64 nInterval = nTargetTimespan / nTargetSpacing;
688 // minimum amount of work that could possibly be required nTime after
689 // minimum work required was nBase
691 unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
693 // Testnet has min-difficulty blocks
694 // after nTargetSpacing*2 time between blocks:
695 if (fTestNet && nTime > nTargetSpacing*2)
696 return bnProofOfWorkLimit.GetCompact();
699 bnResult.SetCompact(nBase);
700 while (nTime > 0 && bnResult < bnProofOfWorkLimit)
702 // Maximum 400% adjustment...
704 // ... in best-case exactly 4-times-normal target time
705 nTime -= nTargetTimespan*4;
707 if (bnResult > bnProofOfWorkLimit)
708 bnResult = bnProofOfWorkLimit;
709 return bnResult.GetCompact();
712 unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlock *pblock)
714 unsigned int nProofOfWorkLimit = bnProofOfWorkLimit.GetCompact();
717 if (pindexLast == NULL)
718 return nProofOfWorkLimit;
720 // Only change once per interval
721 if ((pindexLast->nHeight+1) % nInterval != 0)
723 // Special rules for testnet after 15 Feb 2012:
724 if (fTestNet && pblock->nTime > 1329264000)
726 // If the new block's timestamp is more than 2* 10 minutes
727 // then allow mining of a min-difficulty block.
728 if (pblock->nTime - pindexLast->nTime > nTargetSpacing*2)
729 return nProofOfWorkLimit;
732 // Return the last non-special-min-difficulty-rules-block
733 const CBlockIndex* pindex = pindexLast;
734 while (pindex->pprev && pindex->nHeight % nInterval != 0 && pindex->nBits == nProofOfWorkLimit)
735 pindex = pindex->pprev;
736 return pindex->nBits;
740 return pindexLast->nBits;
743 // Go back by what we want to be 14 days worth of blocks
744 const CBlockIndex* pindexFirst = pindexLast;
745 for (int i = 0; pindexFirst && i < nInterval-1; i++)
746 pindexFirst = pindexFirst->pprev;
749 // Limit adjustment step
750 int64 nActualTimespan = pindexLast->GetBlockTime() - pindexFirst->GetBlockTime();
751 printf(" nActualTimespan = %"PRI64d" before bounds\n", nActualTimespan);
752 if (nActualTimespan < nTargetTimespan/4)
753 nActualTimespan = nTargetTimespan/4;
754 if (nActualTimespan > nTargetTimespan*4)
755 nActualTimespan = nTargetTimespan*4;
759 bnNew.SetCompact(pindexLast->nBits);
760 bnNew *= nActualTimespan;
761 bnNew /= nTargetTimespan;
763 if (bnNew > bnProofOfWorkLimit)
764 bnNew = bnProofOfWorkLimit;
767 printf("GetNextWorkRequired RETARGET\n");
768 printf("nTargetTimespan = %"PRI64d" nActualTimespan = %"PRI64d"\n", nTargetTimespan, nActualTimespan);
769 printf("Before: %08x %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().ToString().c_str());
770 printf("After: %08x %s\n", bnNew.GetCompact(), bnNew.getuint256().ToString().c_str());
772 return bnNew.GetCompact();
775 bool CheckProofOfWork(uint256 hash, unsigned int nBits)
778 bnTarget.SetCompact(nBits);
781 if (bnTarget <= 0 || bnTarget > bnProofOfWorkLimit)
782 return error("CheckProofOfWork() : nBits below minimum work");
784 // Check proof of work matches claimed amount
785 if (hash > bnTarget.getuint256())
786 return error("CheckProofOfWork() : hash doesn't match nBits");
791 bool IsInitialBlockDownload()
793 if (pindexBest == NULL || nBestHeight < (Checkpoints::GetTotalBlocksEstimate()-nInitialBlockThreshold))
795 static int64 nLastUpdate;
796 static CBlockIndex* pindexLastBest;
797 if (pindexBest != pindexLastBest)
799 pindexLastBest = pindexBest;
800 nLastUpdate = GetTime();
802 return (GetTime() - nLastUpdate < 10 &&
803 pindexBest->GetBlockTime() < GetTime() - 24 * 60 * 60);
806 void static InvalidChainFound(CBlockIndex* pindexNew)
808 if (pindexNew->bnChainWork > bnBestInvalidWork)
810 bnBestInvalidWork = pindexNew->bnChainWork;
811 CTxDB().WriteBestInvalidWork(bnBestInvalidWork);
814 printf("InvalidChainFound: invalid block=%s height=%d work=%s\n", pindexNew->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->nHeight, pindexNew->bnChainWork.ToString().c_str());
815 printf("InvalidChainFound: current best=%s height=%d work=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainWork.ToString().c_str());
816 if (pindexBest && bnBestInvalidWork > bnBestChainWork + pindexBest->GetBlockWork() * 6)
817 printf("InvalidChainFound: WARNING: Displayed transactions may not be correct! You may need to upgrade, or other nodes may need to upgrade.\n");
820 void CBlock::UpdateTime(const CBlockIndex* pindexPrev)
822 nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
824 // Updating time can change work required on testnet:
826 nBits = GetNextWorkRequired(pindexPrev, this);
839 bool CTransaction::DisconnectInputs(CTxDB& txdb)
841 // Relinquish previous transactions' spent pointers
844 BOOST_FOREACH(const CTxIn& txin, vin)
846 COutPoint prevout = txin.prevout;
848 // Get prev txindex from disk
850 if (!txdb.ReadTxIndex(prevout.hash, txindex))
851 return error("DisconnectInputs() : ReadTxIndex failed");
853 if (prevout.n >= txindex.vSpent.size())
854 return error("DisconnectInputs() : prevout.n out of range");
856 // Mark outpoint as not spent
857 txindex.vSpent[prevout.n].SetNull();
860 if (!txdb.UpdateTxIndex(prevout.hash, txindex))
861 return error("DisconnectInputs() : UpdateTxIndex failed");
865 // Remove transaction from index
866 // This can fail if a duplicate of this transaction was in a chain that got
867 // reorganized away. This is only possible if this transaction was completely
868 // spent, so erasing it would be a no-op anway.
869 txdb.EraseTxIndex(*this);
875 bool CTransaction::FetchInputs(CTxDB& txdb, const map<uint256, CTxIndex>& mapTestPool,
876 bool fBlock, bool fMiner, MapPrevTx& inputsRet, bool& fInvalid)
878 // FetchInputs can return false either because we just haven't seen some inputs
879 // (in which case the transaction should be stored as an orphan)
880 // or because the transaction is malformed (in which case the transaction should
881 // be dropped). If tx is definitely invalid, fInvalid will be set to true.
885 return true; // Coinbase transactions have no inputs to fetch.
887 for (unsigned int i = 0; i < vin.size(); i++)
889 COutPoint prevout = vin[i].prevout;
890 if (inputsRet.count(prevout.hash))
891 continue; // Got it already
894 CTxIndex& txindex = inputsRet[prevout.hash].first;
896 if ((fBlock || fMiner) && mapTestPool.count(prevout.hash))
898 // Get txindex from current proposed changes
899 txindex = mapTestPool.find(prevout.hash)->second;
903 // Read txindex from txdb
904 fFound = txdb.ReadTxIndex(prevout.hash, txindex);
906 if (!fFound && (fBlock || fMiner))
907 return fMiner ? false : error("FetchInputs() : %s prev tx %s index entry not found", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
910 CTransaction& txPrev = inputsRet[prevout.hash].second;
911 if (!fFound || txindex.pos == CDiskTxPos(1,1,1))
913 // Get prev tx from single transactions in memory
914 CRITICAL_BLOCK(cs_mapTransactions)
916 if (!mapTransactions.count(prevout.hash))
917 return error("FetchInputs() : %s mapTransactions prev not found %s", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
918 txPrev = mapTransactions[prevout.hash];
921 txindex.vSpent.resize(txPrev.vout.size());
925 // Get prev tx from disk
926 if (!txPrev.ReadFromDisk(txindex.pos))
927 return error("FetchInputs() : %s ReadFromDisk prev tx %s failed", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
931 // Make sure all prevout.n's are valid:
932 for (unsigned int i = 0; i < vin.size(); i++)
934 const COutPoint prevout = vin[i].prevout;
935 assert(inputsRet.count(prevout.hash) != 0);
936 const CTxIndex& txindex = inputsRet[prevout.hash].first;
937 const CTransaction& txPrev = inputsRet[prevout.hash].second;
938 if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
940 // Revisit this if/when transaction replacement is implemented and allows
943 return error("FetchInputs() : %s prevout.n out of range %d %d %d prev tx %s\n%s", GetHash().ToString().substr(0,10).c_str(), prevout.n, txPrev.vout.size(), txindex.vSpent.size(), prevout.hash.ToString().substr(0,10).c_str(), txPrev.ToString().c_str());
950 const CTxOut& CTransaction::GetOutputFor(const CTxIn& input, const MapPrevTx& inputs) const
952 MapPrevTx::const_iterator mi = inputs.find(input.prevout.hash);
953 if (mi == inputs.end())
954 throw std::runtime_error("CTransaction::GetOutputFor() : prevout.hash not found");
956 const CTransaction& txPrev = (mi->second).second;
957 if (input.prevout.n >= txPrev.vout.size())
958 throw std::runtime_error("CTransaction::GetOutputFor() : prevout.n out of range");
960 return txPrev.vout[input.prevout.n];
963 int64 CTransaction::GetValueIn(const MapPrevTx& inputs) const
969 for (unsigned int i = 0; i < vin.size(); i++)
971 nResult += GetOutputFor(vin[i], inputs).nValue;
977 int CTransaction::GetP2SHSigOpCount(const MapPrevTx& inputs) const
983 for (unsigned int i = 0; i < vin.size(); i++)
985 const CTxOut& prevout = GetOutputFor(vin[i], inputs);
986 if (prevout.scriptPubKey.IsPayToScriptHash())
987 nSigOps += prevout.scriptPubKey.GetSigOpCount(vin[i].scriptSig);
992 bool CTransaction::ConnectInputs(MapPrevTx inputs,
993 map<uint256, CTxIndex>& mapTestPool, const CDiskTxPos& posThisTx,
994 const CBlockIndex* pindexBlock, bool fBlock, bool fMiner, bool fStrictPayToScriptHash)
996 // Take over previous transactions' spent pointers
997 // fBlock is true when this is called from AcceptBlock when a new best-block is added to the blockchain
998 // fMiner is true when called from the internal bitcoin miner
999 // ... both are false when called from CTransaction::AcceptToMemoryPool
1004 for (unsigned int i = 0; i < vin.size(); i++)
1006 COutPoint prevout = vin[i].prevout;
1007 assert(inputs.count(prevout.hash) > 0);
1008 CTxIndex& txindex = inputs[prevout.hash].first;
1009 CTransaction& txPrev = inputs[prevout.hash].second;
1011 if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
1012 return error("ConnectInputs() : %s prevout.n out of range %d %d %d prev tx %s\n%s", GetHash().ToString().substr(0,10).c_str(), prevout.n, txPrev.vout.size(), txindex.vSpent.size(), prevout.hash.ToString().substr(0,10).c_str(), txPrev.ToString().c_str());
1014 // If prev is coinbase, check that it's matured
1015 if (txPrev.IsCoinBase())
1016 for (const CBlockIndex* pindex = pindexBlock; pindex && pindexBlock->nHeight - pindex->nHeight < COINBASE_MATURITY; pindex = pindex->pprev)
1017 if (pindex->nBlockPos == txindex.pos.nBlockPos && pindex->nFile == txindex.pos.nFile)
1018 return error("ConnectInputs() : tried to spend coinbase at depth %d", pindexBlock->nHeight - pindex->nHeight);
1020 // Check for conflicts (double-spend)
1021 if (!txindex.vSpent[prevout.n].IsNull())
1022 return fMiner ? false : error("ConnectInputs() : %s prev tx already used at %s", GetHash().ToString().substr(0,10).c_str(), txindex.vSpent[prevout.n].ToString().c_str());
1024 // Check for negative or overflow input values
1025 nValueIn += txPrev.vout[prevout.n].nValue;
1026 if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
1027 return error("ConnectInputs() : txin values out of range");
1030 if (!VerifySignature(txPrev, *this, i, fStrictPayToScriptHash, 0))
1032 // only during transition phase for P2SH: do not invoke (external)
1033 // anti-DoS code for potentially old clients relaying bad P2SH
1035 if (fStrictPayToScriptHash && VerifySignature(txPrev, *this, i, false, 0))
1036 return error("ConnectInputs() : %s P2SH VerifySignature failed", GetHash().ToString().substr(0,10).c_str());
1038 return error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str());
1041 // Mark outpoints as spent
1042 txindex.vSpent[prevout.n] = posThisTx;
1045 if (fBlock || fMiner)
1047 mapTestPool[prevout.hash] = txindex;
1051 if (nValueIn < GetValueOut())
1052 return error("ConnectInputs() : %s value in < value out", GetHash().ToString().substr(0,10).c_str());
1054 // Tally transaction fees
1055 int64 nTxFee = nValueIn - GetValueOut();
1057 return error("ConnectInputs() : %s nTxFee < 0", GetHash().ToString().substr(0,10).c_str());
1059 if (!MoneyRange(nFees))
1060 return error("ConnectInputs() : nFees out of range");
1067 bool CTransaction::ClientConnectInputs()
1072 // Take over previous transactions' spent pointers
1073 CRITICAL_BLOCK(cs_mapTransactions)
1076 for (unsigned int i = 0; i < vin.size(); i++)
1078 // Get prev tx from single transactions in memory
1079 COutPoint prevout = vin[i].prevout;
1080 if (!mapTransactions.count(prevout.hash))
1082 CTransaction& txPrev = mapTransactions[prevout.hash];
1084 if (prevout.n >= txPrev.vout.size())
1088 if (!VerifySignature(txPrev, *this, i, true, 0))
1089 return error("ConnectInputs() : VerifySignature failed");
1091 ///// this is redundant with the mapNextTx stuff, not sure which I want to get rid of
1092 ///// this has to go away now that posNext is gone
1093 // // Check for conflicts
1094 // if (!txPrev.vout[prevout.n].posNext.IsNull())
1095 // return error("ConnectInputs() : prev tx already used");
1097 // // Flag outpoints as used
1098 // txPrev.vout[prevout.n].posNext = posThisTx;
1100 nValueIn += txPrev.vout[prevout.n].nValue;
1102 if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
1103 return error("ClientConnectInputs() : txin values out of range");
1105 if (GetValueOut() > nValueIn)
1115 bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
1117 // Disconnect in reverse order
1118 for (int i = vtx.size()-1; i >= 0; i--)
1119 if (!vtx[i].DisconnectInputs(txdb))
1122 // Update block index on disk without changing it in memory.
1123 // The memory index structure will be changed after the db commits.
1126 CDiskBlockIndex blockindexPrev(pindex->pprev);
1127 blockindexPrev.hashNext = 0;
1128 if (!txdb.WriteBlockIndex(blockindexPrev))
1129 return error("DisconnectBlock() : WriteBlockIndex failed");
1135 bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
1137 // Check it again in case a previous version let a bad block in
1141 // Do not allow blocks that contain transactions which 'overwrite' older transactions,
1142 // unless those are already completely spent.
1143 // If such overwrites are allowed, coinbases and transactions depending upon those
1144 // can be duplicated to remove the ability to spend the first instance -- even after
1145 // being sent to another address.
1146 // See BIP30 and http://r6.ca/blog/20120206T005236Z.html for more information.
1147 // This logic is not necessary for memory pool transactions, as AcceptToMemoryPool
1148 // already refuses previously-known transaction id's entirely.
1149 // This rule applies to all blocks whose timestamp is after March 15, 2012, 0:00 UTC.
1150 // On testnet it is enabled as of februari 20, 2012, 0:00 UTC.
1151 if (pindex->nTime > 1331769600 || (fTestNet && pindex->nTime > 1329696000))
1153 BOOST_FOREACH(CTransaction& tx, vtx)
1155 CTxIndex txindexOld;
1156 if (txdb.ReadTxIndex(tx.GetHash(), txindexOld))
1158 BOOST_FOREACH(CDiskTxPos &pos, txindexOld.vSpent)
1165 // P2SH didn't become active until Apr 1 2012 (Feb 15 on testnet)
1166 int64 nEvalSwitchTime = fTestNet ? 1329264000 : 1333238400;
1167 bool fStrictPayToScriptHash = (pindex->nTime >= nEvalSwitchTime);
1169 //// issue here: it doesn't know the version
1170 unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK) - 1 + GetSizeOfCompactSize(vtx.size());
1172 map<uint256, CTxIndex> mapQueuedChanges;
1175 BOOST_FOREACH(CTransaction& tx, vtx)
1177 nSigOps += tx.GetSigOpCount();
1178 if (nSigOps > MAX_BLOCK_SIGOPS)
1179 return error("ConnectBlock() : too many sigops");
1181 CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
1182 nTxPos += ::GetSerializeSize(tx, SER_DISK);
1185 MapPrevTx mapInputs;
1186 if (!tx.IsCoinBase())
1188 if (!tx.FetchInputs(txdb, mapQueuedChanges, true, false, mapInputs, fInvalid))
1191 if (fStrictPayToScriptHash)
1193 // Add in sigops done by pay-to-script-hash inputs;
1194 // this is to prevent a "rogue miner" from creating
1195 // an incredibly-expensive-to-validate block.
1196 nSigOps += tx.GetP2SHSigOpCount(mapInputs);
1197 if (nSigOps > MAX_BLOCK_SIGOPS)
1198 return error("ConnectBlock() : too many sigops");
1201 nFees += tx.GetValueIn(mapInputs)-tx.GetValueOut();
1203 if (!tx.ConnectInputs(mapInputs, mapQueuedChanges, posThisTx, pindex, true, false, fStrictPayToScriptHash))
1207 mapQueuedChanges[tx.GetHash()] = CTxIndex(posThisTx, tx.vout.size());
1210 // Write queued txindex changes
1211 for (map<uint256, CTxIndex>::iterator mi = mapQueuedChanges.begin(); mi != mapQueuedChanges.end(); ++mi)
1213 if (!txdb.UpdateTxIndex((*mi).first, (*mi).second))
1214 return error("ConnectBlock() : UpdateTxIndex failed");
1217 if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
1220 // Update block index on disk without changing it in memory.
1221 // The memory index structure will be changed after the db commits.
1224 CDiskBlockIndex blockindexPrev(pindex->pprev);
1225 blockindexPrev.hashNext = pindex->GetBlockHash();
1226 if (!txdb.WriteBlockIndex(blockindexPrev))
1227 return error("ConnectBlock() : WriteBlockIndex failed");
1230 // Watch for transactions paying to me
1231 BOOST_FOREACH(CTransaction& tx, vtx)
1232 SyncWithWallets(tx, this, true);
1237 bool static Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
1239 printf("REORGANIZE\n");
1242 CBlockIndex* pfork = pindexBest;
1243 CBlockIndex* plonger = pindexNew;
1244 while (pfork != plonger)
1246 while (plonger->nHeight > pfork->nHeight)
1247 if (!(plonger = plonger->pprev))
1248 return error("Reorganize() : plonger->pprev is null");
1249 if (pfork == plonger)
1251 if (!(pfork = pfork->pprev))
1252 return error("Reorganize() : pfork->pprev is null");
1255 // List of what to disconnect
1256 vector<CBlockIndex*> vDisconnect;
1257 for (CBlockIndex* pindex = pindexBest; pindex != pfork; pindex = pindex->pprev)
1258 vDisconnect.push_back(pindex);
1260 // List of what to connect
1261 vector<CBlockIndex*> vConnect;
1262 for (CBlockIndex* pindex = pindexNew; pindex != pfork; pindex = pindex->pprev)
1263 vConnect.push_back(pindex);
1264 reverse(vConnect.begin(), vConnect.end());
1266 printf("REORGANIZE: Disconnect %i blocks; %s..%s\n", vDisconnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexBest->GetBlockHash().ToString().substr(0,20).c_str());
1267 printf("REORGANIZE: Connect %i blocks; %s..%s\n", vConnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->GetBlockHash().ToString().substr(0,20).c_str());
1269 // Disconnect shorter branch
1270 vector<CTransaction> vResurrect;
1271 BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
1274 if (!block.ReadFromDisk(pindex))
1275 return error("Reorganize() : ReadFromDisk for disconnect failed");
1276 if (!block.DisconnectBlock(txdb, pindex))
1277 return error("Reorganize() : DisconnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
1279 // Queue memory transactions to resurrect
1280 BOOST_FOREACH(const CTransaction& tx, block.vtx)
1281 if (!tx.IsCoinBase())
1282 vResurrect.push_back(tx);
1285 // Connect longer branch
1286 vector<CTransaction> vDelete;
1287 for (unsigned int i = 0; i < vConnect.size(); i++)
1289 CBlockIndex* pindex = vConnect[i];
1291 if (!block.ReadFromDisk(pindex))
1292 return error("Reorganize() : ReadFromDisk for connect failed");
1293 if (!block.ConnectBlock(txdb, pindex))
1297 return error("Reorganize() : ConnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
1300 // Queue memory transactions to delete
1301 BOOST_FOREACH(const CTransaction& tx, block.vtx)
1302 vDelete.push_back(tx);
1304 if (!txdb.WriteHashBestChain(pindexNew->GetBlockHash()))
1305 return error("Reorganize() : WriteHashBestChain failed");
1307 // Make sure it's successfully written to disk before changing memory structure
1308 if (!txdb.TxnCommit())
1309 return error("Reorganize() : TxnCommit failed");
1311 // Disconnect shorter branch
1312 BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
1314 pindex->pprev->pnext = NULL;
1316 // Connect longer branch
1317 BOOST_FOREACH(CBlockIndex* pindex, vConnect)
1319 pindex->pprev->pnext = pindex;
1321 // Resurrect memory transactions that were in the disconnected branch
1322 BOOST_FOREACH(CTransaction& tx, vResurrect)
1323 tx.AcceptToMemoryPool(txdb, false);
1325 // Delete redundant memory transactions that are in the connected branch
1326 BOOST_FOREACH(CTransaction& tx, vDelete)
1327 tx.RemoveFromMemoryPool();
1329 printf("REORGANIZE: done\n");
1335 bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
1337 uint256 hash = GetHash();
1339 if (!txdb.TxnBegin())
1340 return error("SetBestChain() : TxnBegin failed");
1342 if (pindexGenesisBlock == NULL && hash == hashGenesisBlock)
1344 txdb.WriteHashBestChain(hash);
1345 if (!txdb.TxnCommit())
1346 return error("SetBestChain() : TxnCommit failed");
1347 pindexGenesisBlock = pindexNew;
1349 else if (hashPrevBlock == hashBestChain)
1351 // Adding to current best branch
1352 if (!ConnectBlock(txdb, pindexNew) || !txdb.WriteHashBestChain(hash))
1355 InvalidChainFound(pindexNew);
1356 return error("SetBestChain() : ConnectBlock failed");
1358 if (!txdb.TxnCommit())
1359 return error("SetBestChain() : TxnCommit failed");
1361 // Add to current best branch
1362 pindexNew->pprev->pnext = pindexNew;
1364 // Delete redundant memory transactions
1365 BOOST_FOREACH(CTransaction& tx, vtx)
1366 tx.RemoveFromMemoryPool();
1371 if (!Reorganize(txdb, pindexNew))
1374 InvalidChainFound(pindexNew);
1375 return error("SetBestChain() : Reorganize failed");
1379 // Update best block in wallet (so we can detect restored wallets)
1380 if (!IsInitialBlockDownload())
1382 const CBlockLocator locator(pindexNew);
1383 ::SetBestChain(locator);
1387 hashBestChain = hash;
1388 pindexBest = pindexNew;
1389 nBestHeight = pindexBest->nHeight;
1390 bnBestChainWork = pindexNew->bnChainWork;
1391 nTimeBestReceived = GetTime();
1392 nTransactionsUpdated++;
1393 printf("SetBestChain: new best=%s height=%d work=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainWork.ToString().c_str());
1399 bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
1401 // Check for duplicate
1402 uint256 hash = GetHash();
1403 if (mapBlockIndex.count(hash))
1404 return error("AddToBlockIndex() : %s already exists", hash.ToString().substr(0,20).c_str());
1406 // Construct new block index object
1407 CBlockIndex* pindexNew = new CBlockIndex(nFile, nBlockPos, *this);
1409 return error("AddToBlockIndex() : new CBlockIndex failed");
1410 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
1411 pindexNew->phashBlock = &((*mi).first);
1412 map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(hashPrevBlock);
1413 if (miPrev != mapBlockIndex.end())
1415 pindexNew->pprev = (*miPrev).second;
1416 pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
1418 pindexNew->bnChainWork = (pindexNew->pprev ? pindexNew->pprev->bnChainWork : 0) + pindexNew->GetBlockWork();
1421 if (!txdb.TxnBegin())
1423 txdb.WriteBlockIndex(CDiskBlockIndex(pindexNew));
1424 if (!txdb.TxnCommit())
1428 if (pindexNew->bnChainWork > bnBestChainWork)
1429 if (!SetBestChain(txdb, pindexNew))
1434 if (pindexNew == pindexBest)
1436 // Notify UI to display prev block's coinbase if it was ours
1437 static uint256 hashPrevBestCoinBase;
1438 UpdatedTransaction(hashPrevBestCoinBase);
1439 hashPrevBestCoinBase = vtx[0].GetHash();
1449 bool CBlock::CheckBlock() const
1451 // These are checks that are independent of context
1452 // that can be verified before saving an orphan block.
1455 if (vtx.empty() || vtx.size() > MAX_BLOCK_SIZE || ::GetSerializeSize(*this, SER_NETWORK) > MAX_BLOCK_SIZE)
1456 return error("CheckBlock() : size limits failed");
1458 // Check proof of work matches claimed amount
1459 if (!CheckProofOfWork(GetHash(), nBits))
1460 return error("CheckBlock() : proof of work failed");
1463 if (GetBlockTime() > GetAdjustedTime() + 2 * 60 * 60)
1464 return error("CheckBlock() : block timestamp too far in the future");
1466 // First transaction must be coinbase, the rest must not be
1467 if (vtx.empty() || !vtx[0].IsCoinBase())
1468 return error("CheckBlock() : first tx is not coinbase");
1469 for (unsigned int i = 1; i < vtx.size(); i++)
1470 if (vtx[i].IsCoinBase())
1471 return error("CheckBlock() : more than one coinbase");
1473 // Check transactions
1474 BOOST_FOREACH(const CTransaction& tx, vtx)
1475 if (!tx.CheckTransaction())
1476 return error("CheckBlock() : CheckTransaction failed");
1478 // Check for duplicate txids. This is caught by ConnectInputs(),
1479 // but catching it earlier avoids a potential DoS attack:
1480 set<uint256> uniqueTx;
1481 BOOST_FOREACH(const CTransaction& tx, vtx)
1483 uniqueTx.insert(tx.GetHash());
1485 if (uniqueTx.size() != vtx.size())
1486 return error("CheckBlock() : duplicate transaction");
1488 // Check that it's not full of nonstandard transactions
1489 if (GetSigOpCount() > MAX_BLOCK_SIGOPS)
1490 return error("CheckBlock() : out-of-bounds SigOpCount");
1493 if (hashMerkleRoot != BuildMerkleTree())
1494 return error("CheckBlock() : hashMerkleRoot mismatch");
1499 bool CBlock::AcceptBlock()
1501 // Check for duplicate
1502 uint256 hash = GetHash();
1503 if (mapBlockIndex.count(hash))
1504 return error("AcceptBlock() : block already in mapBlockIndex");
1506 // Get prev block index
1507 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
1508 if (mi == mapBlockIndex.end())
1509 return error("AcceptBlock() : prev block not found");
1510 CBlockIndex* pindexPrev = (*mi).second;
1511 int nHeight = pindexPrev->nHeight+1;
1513 // Check proof of work
1514 if (nBits != GetNextWorkRequired(pindexPrev, this))
1515 return error("AcceptBlock() : incorrect proof of work");
1517 // Check timestamp against prev
1518 if (GetBlockTime() <= pindexPrev->GetMedianTimePast())
1519 return error("AcceptBlock() : block's timestamp is too early");
1521 // Check that all transactions are finalized
1522 BOOST_FOREACH(const CTransaction& tx, vtx)
1523 if (!tx.IsFinal(nHeight, GetBlockTime()))
1524 return error("AcceptBlock() : contains a non-final transaction");
1526 // Check that the block chain matches the known block chain up to a checkpoint
1527 if (!Checkpoints::CheckBlock(nHeight, hash))
1528 return error("AcceptBlock() : rejected by checkpoint lockin at %d", nHeight);
1530 // Write block to history file
1531 if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK)))
1532 return error("AcceptBlock() : out of disk space");
1533 unsigned int nFile = -1;
1534 unsigned int nBlockPos = 0;
1535 if (!WriteToDisk(nFile, nBlockPos))
1536 return error("AcceptBlock() : WriteToDisk failed");
1537 if (!AddToBlockIndex(nFile, nBlockPos))
1538 return error("AcceptBlock() : AddToBlockIndex failed");
1540 // Relay inventory, but don't relay old inventory during initial block download
1541 int nBlockEstimate = Checkpoints::GetTotalBlocksEstimate();
1542 if (hashBestChain == hash)
1543 CRITICAL_BLOCK(cs_vNodes)
1544 BOOST_FOREACH(CNode* pnode, vNodes)
1545 if (nBestHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : nBlockEstimate))
1546 pnode->PushInventory(CInv(MSG_BLOCK, hash));
1551 bool static ProcessBlock(CNode* pfrom, CBlock* pblock)
1553 // Check for duplicate
1554 uint256 hash = pblock->GetHash();
1555 if (mapBlockIndex.count(hash))
1556 return error("ProcessBlock() : already have block %d %s", mapBlockIndex[hash]->nHeight, hash.ToString().substr(0,20).c_str());
1557 if (mapOrphanBlocks.count(hash))
1558 return error("ProcessBlock() : already have block (orphan) %s", hash.ToString().substr(0,20).c_str());
1560 // Preliminary checks
1561 if (!pblock->CheckBlock())
1562 return error("ProcessBlock() : CheckBlock FAILED");
1564 CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(mapBlockIndex);
1565 if (pcheckpoint && pblock->hashPrevBlock != hashBestChain)
1567 // Extra checks to prevent "fill up memory by spamming with bogus blocks"
1568 int64 deltaTime = pblock->GetBlockTime() - pcheckpoint->nTime;
1571 return error("ProcessBlock() : block with timestamp before last checkpoint");
1574 bnNewBlock.SetCompact(pblock->nBits);
1576 bnRequired.SetCompact(ComputeMinWork(pcheckpoint->nBits, deltaTime));
1577 if (bnNewBlock > bnRequired)
1579 return error("ProcessBlock() : block with too little proof-of-work");
1584 // If don't already have its previous block, shunt it off to holding area until we get it
1585 if (!mapBlockIndex.count(pblock->hashPrevBlock))
1587 printf("ProcessBlock: ORPHAN BLOCK, prev=%s\n", pblock->hashPrevBlock.ToString().substr(0,20).c_str());
1588 CBlock* pblock2 = new CBlock(*pblock);
1589 mapOrphanBlocks.insert(make_pair(hash, pblock2));
1590 mapOrphanBlocksByPrev.insert(make_pair(pblock2->hashPrevBlock, pblock2));
1592 // Ask this guy to fill in what we're missing
1594 pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(pblock2));
1599 if (!pblock->AcceptBlock())
1600 return error("ProcessBlock() : AcceptBlock FAILED");
1602 // Recursively process any orphan blocks that depended on this one
1603 vector<uint256> vWorkQueue;
1604 vWorkQueue.push_back(hash);
1605 for (unsigned int i = 0; i < vWorkQueue.size(); i++)
1607 uint256 hashPrev = vWorkQueue[i];
1608 for (multimap<uint256, CBlock*>::iterator mi = mapOrphanBlocksByPrev.lower_bound(hashPrev);
1609 mi != mapOrphanBlocksByPrev.upper_bound(hashPrev);
1612 CBlock* pblockOrphan = (*mi).second;
1613 if (pblockOrphan->AcceptBlock())
1614 vWorkQueue.push_back(pblockOrphan->GetHash());
1615 mapOrphanBlocks.erase(pblockOrphan->GetHash());
1616 delete pblockOrphan;
1618 mapOrphanBlocksByPrev.erase(hashPrev);
1621 printf("ProcessBlock: ACCEPTED\n");
1632 bool CheckDiskSpace(uint64 nAdditionalBytes)
1634 uint64 nFreeBytesAvailable = filesystem::space(GetDataDir()).available;
1636 // Check for 15MB because database could create another 10MB log file at any time
1637 if (nFreeBytesAvailable < (uint64)15000000 + nAdditionalBytes)
1640 string strMessage = _("Warning: Disk space is low ");
1641 strMiscWarning = strMessage;
1642 printf("*** %s\n", strMessage.c_str());
1643 ThreadSafeMessageBox(strMessage, "Bitcoin", wxOK | wxICON_EXCLAMATION);
1644 CreateThread(Shutdown, NULL);
1650 FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode)
1654 FILE* file = fopen(strprintf("%s/blk%04d.dat", GetDataDir().c_str(), nFile).c_str(), pszMode);
1657 if (nBlockPos != 0 && !strchr(pszMode, 'a') && !strchr(pszMode, 'w'))
1659 if (fseek(file, nBlockPos, SEEK_SET) != 0)
1668 static unsigned int nCurrentBlockFile = 1;
1670 FILE* AppendBlockFile(unsigned int& nFileRet)
1675 FILE* file = OpenBlockFile(nCurrentBlockFile, 0, "ab");
1678 if (fseek(file, 0, SEEK_END) != 0)
1680 // FAT32 filesize max 4GB, fseek and ftell max 2GB, so we must stay under 2GB
1681 if (ftell(file) < 0x7F000000 - MAX_SIZE)
1683 nFileRet = nCurrentBlockFile;
1687 nCurrentBlockFile++;
1691 bool LoadBlockIndex(bool fAllowNew)
1695 hashGenesisBlock = uint256("0x00000007199508e34a9ff81e6ec0c477a4cccff2a4767a8eee39c11db367b008");
1696 bnProofOfWorkLimit = CBigNum(~uint256(0) >> 28);
1697 pchMessageStart[0] = 0xfa;
1698 pchMessageStart[1] = 0xbf;
1699 pchMessageStart[2] = 0xb5;
1700 pchMessageStart[3] = 0xda;
1707 if (!txdb.LoadBlockIndex())
1712 // Init with genesis block
1714 if (mapBlockIndex.empty())
1720 // CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
1721 // CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
1722 // CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
1723 // CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
1724 // vMerkleTree: 4a5e1e
1727 const char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
1729 txNew.vin.resize(1);
1730 txNew.vout.resize(1);
1731 txNew.vin[0].scriptSig = CScript() << 486604799 << CBigNum(4) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
1732 txNew.vout[0].nValue = 50 * COIN;
1733 txNew.vout[0].scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
1735 block.vtx.push_back(txNew);
1736 block.hashPrevBlock = 0;
1737 block.hashMerkleRoot = block.BuildMerkleTree();
1739 block.nTime = 1231006505;
1740 block.nBits = 0x1d00ffff;
1741 block.nNonce = 2083236893;
1745 block.nTime = 1296688602;
1746 block.nBits = 0x1d07fff8;
1747 block.nNonce = 384568319;
1751 printf("%s\n", block.GetHash().ToString().c_str());
1752 printf("%s\n", hashGenesisBlock.ToString().c_str());
1753 printf("%s\n", block.hashMerkleRoot.ToString().c_str());
1754 assert(block.hashMerkleRoot == uint256("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
1756 assert(block.GetHash() == hashGenesisBlock);
1758 // Start new block file
1760 unsigned int nBlockPos;
1761 if (!block.WriteToDisk(nFile, nBlockPos))
1762 return error("LoadBlockIndex() : writing genesis block to disk failed");
1763 if (!block.AddToBlockIndex(nFile, nBlockPos))
1764 return error("LoadBlockIndex() : genesis block not accepted");
1772 void PrintBlockTree()
1774 // precompute tree structure
1775 map<CBlockIndex*, vector<CBlockIndex*> > mapNext;
1776 for (map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
1778 CBlockIndex* pindex = (*mi).second;
1779 mapNext[pindex->pprev].push_back(pindex);
1781 //while (rand() % 3 == 0)
1782 // mapNext[pindex->pprev].push_back(pindex);
1785 vector<pair<int, CBlockIndex*> > vStack;
1786 vStack.push_back(make_pair(0, pindexGenesisBlock));
1789 while (!vStack.empty())
1791 int nCol = vStack.back().first;
1792 CBlockIndex* pindex = vStack.back().second;
1795 // print split or gap
1796 if (nCol > nPrevCol)
1798 for (int i = 0; i < nCol-1; i++)
1802 else if (nCol < nPrevCol)
1804 for (int i = 0; i < nCol; i++)
1811 for (int i = 0; i < nCol; i++)
1816 block.ReadFromDisk(pindex);
1817 printf("%d (%u,%u) %s %s tx %d",
1821 block.GetHash().ToString().substr(0,20).c_str(),
1822 DateTimeStrFormat("%x %H:%M:%S", block.GetBlockTime()).c_str(),
1825 PrintWallets(block);
1827 // put the main timechain first
1828 vector<CBlockIndex*>& vNext = mapNext[pindex];
1829 for (unsigned int i = 0; i < vNext.size(); i++)
1831 if (vNext[i]->pnext)
1833 swap(vNext[0], vNext[i]);
1839 for (unsigned int i = 0; i < vNext.size(); i++)
1840 vStack.push_back(make_pair(nCol+i, vNext[i]));
1853 //////////////////////////////////////////////////////////////////////////////
1858 map<uint256, CAlert> mapAlerts;
1859 CCriticalSection cs_mapAlerts;
1861 string GetWarnings(string strFor)
1864 string strStatusBar;
1866 if (GetBoolArg("-testsafemode"))
1869 // Misc warnings like out of disk space and clock is wrong
1870 if (strMiscWarning != "")
1873 strStatusBar = strMiscWarning;
1876 // Longer invalid proof-of-work chain
1877 if (pindexBest && bnBestInvalidWork > bnBestChainWork + pindexBest->GetBlockWork() * 6)
1880 strStatusBar = strRPC = "WARNING: Displayed transactions may not be correct! You may need to upgrade, or other nodes may need to upgrade.";
1884 CRITICAL_BLOCK(cs_mapAlerts)
1886 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
1888 const CAlert& alert = item.second;
1889 if (alert.AppliesToMe() && alert.nPriority > nPriority)
1891 nPriority = alert.nPriority;
1892 strStatusBar = alert.strStatusBar;
1897 if (strFor == "statusbar")
1898 return strStatusBar;
1899 else if (strFor == "rpc")
1901 assert(!"GetWarnings() : invalid parameter");
1905 bool CAlert::ProcessAlert()
1907 if (!CheckSignature())
1912 CRITICAL_BLOCK(cs_mapAlerts)
1914 // Cancel previous alerts
1915 for (map<uint256, CAlert>::iterator mi = mapAlerts.begin(); mi != mapAlerts.end();)
1917 const CAlert& alert = (*mi).second;
1920 printf("cancelling alert %d\n", alert.nID);
1921 mapAlerts.erase(mi++);
1923 else if (!alert.IsInEffect())
1925 printf("expiring alert %d\n", alert.nID);
1926 mapAlerts.erase(mi++);
1932 // Check if this alert has been cancelled
1933 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
1935 const CAlert& alert = item.second;
1936 if (alert.Cancels(*this))
1938 printf("alert already cancelled by %d\n", alert.nID);
1944 mapAlerts.insert(make_pair(GetHash(), *this));
1947 printf("accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe());
1959 //////////////////////////////////////////////////////////////////////////////
1965 bool static AlreadyHave(CTxDB& txdb, const CInv& inv)
1971 bool txInMap = false;
1972 CRITICAL_BLOCK(cs_mapTransactions)
1974 txInMap = (mapTransactions.count(inv.hash) != 0);
1977 mapOrphanTransactions.count(inv.hash) ||
1978 txdb.ContainsTx(inv.hash);
1981 case MSG_BLOCK: return mapBlockIndex.count(inv.hash) || mapOrphanBlocks.count(inv.hash);
1983 // Don't know what it is, just say we already got one
1990 // The message start string is designed to be unlikely to occur in normal data.
1991 // The characters are rarely used upper ascii, not valid as UTF-8, and produce
1992 // a large 4-byte int at any alignment.
1993 unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
1996 bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
1998 static map<unsigned int, vector<unsigned char> > mapReuseKey;
1999 RandAddSeedPerfmon();
2001 printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
2002 printf("received: %s (%d bytes)\n", strCommand.c_str(), vRecv.size());
2004 if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
2006 printf("dropmessagestest DROPPING RECV MESSAGE\n");
2014 if (strCommand == "version")
2016 // Each connection can only send one version message
2017 if (pfrom->nVersion != 0)
2024 vRecv >> pfrom->nVersion >> pfrom->nServices >> nTime >> addrMe;
2025 if (pfrom->nVersion == 10300)
2026 pfrom->nVersion = 300;
2027 if (pfrom->nVersion >= 106 && !vRecv.empty())
2028 vRecv >> addrFrom >> nNonce;
2029 if (pfrom->nVersion >= 106 && !vRecv.empty())
2030 vRecv >> pfrom->strSubVer;
2031 if (pfrom->nVersion >= 209 && !vRecv.empty())
2032 vRecv >> pfrom->nStartingHeight;
2034 if (pfrom->nVersion == 0)
2037 // Disconnect if we connected to ourself
2038 if (nNonce == nLocalHostNonce && nNonce > 1)
2040 printf("connected to self at %s, disconnecting\n", pfrom->addr.ToString().c_str());
2041 pfrom->fDisconnect = true;
2045 // Be shy and don't send version until we hear
2046 if (pfrom->fInbound)
2047 pfrom->PushVersion();
2049 pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
2051 AddTimeData(pfrom->addr.ip, nTime);
2054 if (pfrom->nVersion >= 209)
2055 pfrom->PushMessage("verack");
2056 pfrom->vSend.SetVersion(min(pfrom->nVersion, VERSION));
2057 if (pfrom->nVersion < 209)
2058 pfrom->vRecv.SetVersion(min(pfrom->nVersion, VERSION));
2060 if (!pfrom->fInbound)
2062 // Advertise our address
2063 if (addrLocalHost.IsRoutable() && !fUseProxy)
2065 CAddress addr(addrLocalHost);
2066 addr.nTime = GetAdjustedTime();
2067 pfrom->PushAddress(addr);
2070 // Get recent addresses
2071 if (pfrom->nVersion >= 31402 || mapAddresses.size() < 1000)
2073 pfrom->PushMessage("getaddr");
2074 pfrom->fGetAddr = true;
2078 // Ask the first connected node for block updates
2079 static int nAskedForBlocks = 0;
2080 if (!pfrom->fClient &&
2081 (pfrom->nVersion < 32000 || pfrom->nVersion >= 32400) &&
2082 (nAskedForBlocks < 1 || vNodes.size() <= 1))
2085 pfrom->PushGetBlocks(pindexBest, uint256(0));
2089 CRITICAL_BLOCK(cs_mapAlerts)
2090 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
2091 item.second.RelayTo(pfrom);
2093 pfrom->fSuccessfullyConnected = true;
2095 printf("version message: version %d, blocks=%d\n", pfrom->nVersion, pfrom->nStartingHeight);
2099 else if (pfrom->nVersion == 0)
2101 // Must have a version message before anything else
2106 else if (strCommand == "verack")
2108 pfrom->vRecv.SetVersion(min(pfrom->nVersion, VERSION));
2112 else if (strCommand == "addr")
2114 vector<CAddress> vAddr;
2117 // Don't want addr from older versions unless seeding
2118 if (pfrom->nVersion < 209)
2120 if (pfrom->nVersion < 31402 && mapAddresses.size() > 1000)
2122 if (vAddr.size() > 1000)
2123 return error("message addr size() = %d", vAddr.size());
2125 // Store the new addresses
2128 int64 nNow = GetAdjustedTime();
2129 int64 nSince = nNow - 10 * 60;
2130 BOOST_FOREACH(CAddress& addr, vAddr)
2134 // ignore IPv6 for now, since it isn't implemented anyway
2137 if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
2138 addr.nTime = nNow - 5 * 24 * 60 * 60;
2139 AddAddress(addr, 2 * 60 * 60, &addrDB);
2140 pfrom->AddAddressKnown(addr);
2141 if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
2143 // Relay to a limited number of other nodes
2144 CRITICAL_BLOCK(cs_vNodes)
2146 // Use deterministic randomness to send to the same nodes for 24 hours
2147 // at a time so the setAddrKnowns of the chosen nodes prevent repeats
2148 static uint256 hashSalt;
2150 RAND_bytes((unsigned char*)&hashSalt, sizeof(hashSalt));
2151 uint256 hashRand = hashSalt ^ (((int64)addr.ip)<<32) ^ ((GetTime()+addr.ip)/(24*60*60));
2152 hashRand = Hash(BEGIN(hashRand), END(hashRand));
2153 multimap<uint256, CNode*> mapMix;
2154 BOOST_FOREACH(CNode* pnode, vNodes)
2156 if (pnode->nVersion < 31402)
2158 unsigned int nPointer;
2159 memcpy(&nPointer, &pnode, sizeof(nPointer));
2160 uint256 hashKey = hashRand ^ nPointer;
2161 hashKey = Hash(BEGIN(hashKey), END(hashKey));
2162 mapMix.insert(make_pair(hashKey, pnode));
2164 int nRelayNodes = 2;
2165 for (multimap<uint256, CNode*>::iterator mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
2166 ((*mi).second)->PushAddress(addr);
2170 addrDB.TxnCommit(); // Save addresses (it's ok if this fails)
2171 if (vAddr.size() < 1000)
2172 pfrom->fGetAddr = false;
2176 else if (strCommand == "inv")
2180 if (vInv.size() > 50000)
2181 return error("message inv size() = %d", vInv.size());
2183 // find last block in inv vector
2184 unsigned int nLastBlock = (unsigned int)(-1);
2185 for (unsigned int nInv = 0; nInv < vInv.size(); nInv++) {
2186 if (vInv[vInv.size() - 1 - nInv].type == MSG_BLOCK) {
2187 nLastBlock = vInv.size() - 1 - nInv;
2192 for (int nInv = 0; nInv < vInv.size(); nInv++)
2194 const CInv &inv = vInv[nInv];
2198 pfrom->AddInventoryKnown(inv);
2200 bool fAlreadyHave = AlreadyHave(txdb, inv);
2202 printf(" got inventory: %s %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new");
2206 else if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash)) {
2207 pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(mapOrphanBlocks[inv.hash]));
2208 } else if (nInv == nLastBlock) {
2209 // In case we are on a very long side-chain, it is possible that we already have
2210 // the last block in an inv bundle sent in response to getblocks. Try to detect
2211 // this situation and push another getblocks to continue.
2212 std::vector<CInv> vGetData(1,inv);
2213 pfrom->PushGetBlocks(mapBlockIndex[inv.hash], uint256(0));
2215 printf("force request: %s\n", inv.ToString().c_str());
2218 // Track requests for our stuff
2219 Inventory(inv.hash);
2224 else if (strCommand == "getdata")
2228 if (vInv.size() > 50000)
2229 return error("message getdata size() = %d", vInv.size());
2231 BOOST_FOREACH(const CInv& inv, vInv)
2235 printf("received getdata for: %s\n", inv.ToString().c_str());
2237 if (inv.type == MSG_BLOCK)
2239 // Send block from disk
2240 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(inv.hash);
2241 if (mi != mapBlockIndex.end())
2244 block.ReadFromDisk((*mi).second);
2245 pfrom->PushMessage("block", block);
2247 // Trigger them to send a getblocks request for the next batch of inventory
2248 if (inv.hash == pfrom->hashContinue)
2250 // Bypass PushInventory, this must send even if redundant,
2251 // and we want it right after the last block so they don't
2252 // wait for other stuff first.
2254 vInv.push_back(CInv(MSG_BLOCK, hashBestChain));
2255 pfrom->PushMessage("inv", vInv);
2256 pfrom->hashContinue = 0;
2260 else if (inv.IsKnownType())
2262 // Send stream from relay memory
2263 CRITICAL_BLOCK(cs_mapRelay)
2265 map<CInv, CDataStream>::iterator mi = mapRelay.find(inv);
2266 if (mi != mapRelay.end())
2267 pfrom->PushMessage(inv.GetCommand(), (*mi).second);
2271 // Track requests for our stuff
2272 Inventory(inv.hash);
2277 else if (strCommand == "getblocks")
2279 CBlockLocator locator;
2281 vRecv >> locator >> hashStop;
2283 // Find the last block the caller has in the main chain
2284 CBlockIndex* pindex = locator.GetBlockIndex();
2286 // Send the rest of the chain
2288 pindex = pindex->pnext;
2289 int nLimit = 500 + locator.GetDistanceBack();
2290 unsigned int nBytes = 0;
2291 printf("getblocks %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
2292 for (; pindex; pindex = pindex->pnext)
2294 if (pindex->GetBlockHash() == hashStop)
2296 printf(" getblocks stopping at %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
2299 pfrom->PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash()));
2301 block.ReadFromDisk(pindex, true);
2302 nBytes += block.GetSerializeSize(SER_NETWORK);
2303 if (--nLimit <= 0 || nBytes >= SendBufferSize()/2)
2305 // When this block is requested, we'll send an inv that'll make them
2306 // getblocks the next batch of inventory.
2307 printf(" getblocks stopping at limit %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
2308 pfrom->hashContinue = pindex->GetBlockHash();
2315 else if (strCommand == "getheaders")
2317 CBlockLocator locator;
2319 vRecv >> locator >> hashStop;
2321 CBlockIndex* pindex = NULL;
2322 if (locator.IsNull())
2324 // If locator is null, return the hashStop block
2325 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashStop);
2326 if (mi == mapBlockIndex.end())
2328 pindex = (*mi).second;
2332 // Find the last block the caller has in the main chain
2333 pindex = locator.GetBlockIndex();
2335 pindex = pindex->pnext;
2338 vector<CBlock> vHeaders;
2339 int nLimit = 2000 + locator.GetDistanceBack();
2340 printf("getheaders %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
2341 for (; pindex; pindex = pindex->pnext)
2343 vHeaders.push_back(pindex->GetBlockHeader());
2344 if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
2347 pfrom->PushMessage("headers", vHeaders);
2351 else if (strCommand == "tx")
2353 vector<uint256> vWorkQueue;
2354 CDataStream vMsg(vRecv);
2358 CInv inv(MSG_TX, tx.GetHash());
2359 pfrom->AddInventoryKnown(inv);
2361 bool fMissingInputs = false;
2362 if (tx.AcceptToMemoryPool(true, &fMissingInputs))
2364 SyncWithWallets(tx, NULL, true);
2365 RelayMessage(inv, vMsg);
2366 mapAlreadyAskedFor.erase(inv);
2367 vWorkQueue.push_back(inv.hash);
2369 // Recursively process any orphan transactions that depended on this one
2370 for (unsigned int i = 0; i < vWorkQueue.size(); i++)
2372 uint256 hashPrev = vWorkQueue[i];
2373 for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(hashPrev);
2374 mi != mapOrphanTransactionsByPrev.upper_bound(hashPrev);
2377 const CDataStream& vMsg = *((*mi).second);
2379 CDataStream(vMsg) >> tx;
2380 CInv inv(MSG_TX, tx.GetHash());
2382 if (tx.AcceptToMemoryPool(true))
2384 printf(" accepted orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
2385 SyncWithWallets(tx, NULL, true);
2386 RelayMessage(inv, vMsg);
2387 mapAlreadyAskedFor.erase(inv);
2388 vWorkQueue.push_back(inv.hash);
2393 BOOST_FOREACH(uint256 hash, vWorkQueue)
2394 EraseOrphanTx(hash);
2396 else if (fMissingInputs)
2398 printf("storing orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
2401 // DoS prevention: do not allow mapOrphanTransactions to grow unbounded
2402 int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
2404 printf("mapOrphan overflow, removed %d tx\n", nEvicted);
2409 else if (strCommand == "block")
2414 printf("received block %s\n", block.GetHash().ToString().substr(0,20).c_str());
2417 CInv inv(MSG_BLOCK, block.GetHash());
2418 pfrom->AddInventoryKnown(inv);
2420 if (ProcessBlock(pfrom, &block))
2421 mapAlreadyAskedFor.erase(inv);
2425 else if (strCommand == "getaddr")
2427 // Nodes rebroadcast an addr every 24 hours
2428 pfrom->vAddrToSend.clear();
2429 int64 nSince = GetAdjustedTime() - 3 * 60 * 60; // in the last 3 hours
2430 CRITICAL_BLOCK(cs_mapAddresses)
2432 unsigned int nCount = 0;
2433 BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
2435 const CAddress& addr = item.second;
2436 if (addr.nTime > nSince)
2439 BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
2441 const CAddress& addr = item.second;
2442 if (addr.nTime > nSince && GetRand(nCount) < 2500)
2443 pfrom->PushAddress(addr);
2449 else if (strCommand == "checkorder")
2454 if (!GetBoolArg("-allowreceivebyip"))
2456 pfrom->PushMessage("reply", hashReply, (int)2, string(""));
2463 /// we have a chance to check the order here
2465 // Keep giving the same key to the same ip until they use it
2466 if (!mapReuseKey.count(pfrom->addr.ip))
2467 pwalletMain->GetKeyFromPool(mapReuseKey[pfrom->addr.ip], true);
2469 // Send back approval of order and pubkey to use
2470 CScript scriptPubKey;
2471 scriptPubKey << mapReuseKey[pfrom->addr.ip] << OP_CHECKSIG;
2472 pfrom->PushMessage("reply", hashReply, (int)0, scriptPubKey);
2476 else if (strCommand == "reply")
2481 CRequestTracker tracker;
2482 CRITICAL_BLOCK(pfrom->cs_mapRequests)
2484 map<uint256, CRequestTracker>::iterator mi = pfrom->mapRequests.find(hashReply);
2485 if (mi != pfrom->mapRequests.end())
2487 tracker = (*mi).second;
2488 pfrom->mapRequests.erase(mi);
2491 if (!tracker.IsNull())
2492 tracker.fn(tracker.param1, vRecv);
2496 else if (strCommand == "ping")
2501 else if (strCommand == "alert")
2506 if (alert.ProcessAlert())
2509 pfrom->setKnown.insert(alert.GetHash());
2510 CRITICAL_BLOCK(cs_vNodes)
2511 BOOST_FOREACH(CNode* pnode, vNodes)
2512 alert.RelayTo(pnode);
2519 // Ignore unknown commands for extensibility
2523 // Update the last seen time for this node's address
2524 if (pfrom->fNetworkNode)
2525 if (strCommand == "version" || strCommand == "addr" || strCommand == "inv" || strCommand == "getdata" || strCommand == "ping")
2526 AddressCurrentlyConnected(pfrom->addr);
2532 bool ProcessMessages(CNode* pfrom)
2534 CDataStream& vRecv = pfrom->vRecv;
2538 // printf("ProcessMessages(%u bytes)\n", vRecv.size());
2542 // (4) message start
2551 // Scan for message start
2552 CDataStream::iterator pstart = search(vRecv.begin(), vRecv.end(), BEGIN(pchMessageStart), END(pchMessageStart));
2553 int nHeaderSize = vRecv.GetSerializeSize(CMessageHeader());
2554 if (vRecv.end() - pstart < nHeaderSize)
2556 if (vRecv.size() > nHeaderSize)
2558 printf("\n\nPROCESSMESSAGE MESSAGESTART NOT FOUND\n\n");
2559 vRecv.erase(vRecv.begin(), vRecv.end() - nHeaderSize);
2563 if (pstart - vRecv.begin() > 0)
2564 printf("\n\nPROCESSMESSAGE SKIPPED %d BYTES\n\n", pstart - vRecv.begin());
2565 vRecv.erase(vRecv.begin(), pstart);
2568 vector<char> vHeaderSave(vRecv.begin(), vRecv.begin() + nHeaderSize);
2573 printf("\n\nPROCESSMESSAGE: ERRORS IN HEADER %s\n\n\n", hdr.GetCommand().c_str());
2576 string strCommand = hdr.GetCommand();
2579 unsigned int nMessageSize = hdr.nMessageSize;
2580 if (nMessageSize > MAX_SIZE)
2582 printf("ProcessMessage(%s, %u bytes) : nMessageSize > MAX_SIZE\n", strCommand.c_str(), nMessageSize);
2585 if (nMessageSize > vRecv.size())
2587 // Rewind and wait for rest of message
2588 vRecv.insert(vRecv.begin(), vHeaderSave.begin(), vHeaderSave.end());
2593 if (vRecv.GetVersion() >= 209)
2595 uint256 hash = Hash(vRecv.begin(), vRecv.begin() + nMessageSize);
2596 unsigned int nChecksum = 0;
2597 memcpy(&nChecksum, &hash, sizeof(nChecksum));
2598 if (nChecksum != hdr.nChecksum)
2600 printf("ProcessMessage(%s, %u bytes) : CHECKSUM ERROR nChecksum=%08x hdr.nChecksum=%08x\n",
2601 strCommand.c_str(), nMessageSize, nChecksum, hdr.nChecksum);
2606 // Copy message to its own buffer
2607 CDataStream vMsg(vRecv.begin(), vRecv.begin() + nMessageSize, vRecv.nType, vRecv.nVersion);
2608 vRecv.ignore(nMessageSize);
2614 CRITICAL_BLOCK(cs_main)
2615 fRet = ProcessMessage(pfrom, strCommand, vMsg);
2619 catch (std::ios_base::failure& e)
2621 if (strstr(e.what(), "end of data"))
2623 // Allow exceptions from underlength message on vRecv
2624 printf("ProcessMessage(%s, %u bytes) : Exception '%s' caught, normally caused by a message being shorter than its stated length\n", strCommand.c_str(), nMessageSize, e.what());
2626 else if (strstr(e.what(), "size too large"))
2628 // Allow exceptions from overlong size
2629 printf("ProcessMessage(%s, %u bytes) : Exception '%s' caught\n", strCommand.c_str(), nMessageSize, e.what());
2633 PrintExceptionContinue(&e, "ProcessMessage()");
2636 catch (std::exception& e) {
2637 PrintExceptionContinue(&e, "ProcessMessage()");
2639 PrintExceptionContinue(NULL, "ProcessMessage()");
2643 printf("ProcessMessage(%s, %u bytes) FAILED\n", strCommand.c_str(), nMessageSize);
2651 bool SendMessages(CNode* pto, bool fSendTrickle)
2653 TRY_CRITICAL_BLOCK(cs_main)
2655 // Don't send anything until we get their version message
2656 if (pto->nVersion == 0)
2660 if (pto->nLastSend && GetTime() - pto->nLastSend > 30 * 60 && pto->vSend.empty())
2661 pto->PushMessage("ping");
2663 // Resend wallet transactions that haven't gotten in a block yet
2664 ResendWalletTransactions();
2666 // Address refresh broadcast
2667 static int64 nLastRebroadcast;
2668 if (GetTime() - nLastRebroadcast > 24 * 60 * 60)
2670 nLastRebroadcast = GetTime();
2671 CRITICAL_BLOCK(cs_vNodes)
2673 BOOST_FOREACH(CNode* pnode, vNodes)
2675 // Periodically clear setAddrKnown to allow refresh broadcasts
2676 pnode->setAddrKnown.clear();
2678 // Rebroadcast our address
2679 if (addrLocalHost.IsRoutable() && !fUseProxy)
2681 CAddress addr(addrLocalHost);
2682 addr.nTime = GetAdjustedTime();
2683 pnode->PushAddress(addr);
2689 // Clear out old addresses periodically so it's not too much work at once
2690 static int64 nLastClear;
2691 if (nLastClear == 0)
2692 nLastClear = GetTime();
2693 if (GetTime() - nLastClear > 10 * 60 && vNodes.size() >= 3)
2695 nLastClear = GetTime();
2696 CRITICAL_BLOCK(cs_mapAddresses)
2699 int64 nSince = GetAdjustedTime() - 14 * 24 * 60 * 60;
2700 for (map<vector<unsigned char>, CAddress>::iterator mi = mapAddresses.begin();
2701 mi != mapAddresses.end();)
2703 const CAddress& addr = (*mi).second;
2704 if (addr.nTime < nSince)
2706 if (mapAddresses.size() < 1000 || GetTime() > nLastClear + 20)
2708 addrdb.EraseAddress(addr);
2709 mapAddresses.erase(mi++);
2723 vector<CAddress> vAddr;
2724 vAddr.reserve(pto->vAddrToSend.size());
2725 BOOST_FOREACH(const CAddress& addr, pto->vAddrToSend)
2727 // returns true if wasn't already contained in the set
2728 if (pto->setAddrKnown.insert(addr).second)
2730 vAddr.push_back(addr);
2731 // receiver rejects addr messages larger than 1000
2732 if (vAddr.size() >= 1000)
2734 pto->PushMessage("addr", vAddr);
2739 pto->vAddrToSend.clear();
2741 pto->PushMessage("addr", vAddr);
2746 // Message: inventory
2749 vector<CInv> vInvWait;
2750 CRITICAL_BLOCK(pto->cs_inventory)
2752 vInv.reserve(pto->vInventoryToSend.size());
2753 vInvWait.reserve(pto->vInventoryToSend.size());
2754 BOOST_FOREACH(const CInv& inv, pto->vInventoryToSend)
2756 if (pto->setInventoryKnown.count(inv))
2759 // trickle out tx inv to protect privacy
2760 if (inv.type == MSG_TX && !fSendTrickle)
2762 // 1/4 of tx invs blast to all immediately
2763 static uint256 hashSalt;
2765 RAND_bytes((unsigned char*)&hashSalt, sizeof(hashSalt));
2766 uint256 hashRand = inv.hash ^ hashSalt;
2767 hashRand = Hash(BEGIN(hashRand), END(hashRand));
2768 bool fTrickleWait = ((hashRand & 3) != 0);
2770 // always trickle our own transactions
2774 if (GetTransaction(inv.hash, wtx))
2776 fTrickleWait = true;
2781 vInvWait.push_back(inv);
2786 // returns true if wasn't already contained in the set
2787 if (pto->setInventoryKnown.insert(inv).second)
2789 vInv.push_back(inv);
2790 if (vInv.size() >= 1000)
2792 pto->PushMessage("inv", vInv);
2797 pto->vInventoryToSend = vInvWait;
2800 pto->PushMessage("inv", vInv);
2806 vector<CInv> vGetData;
2807 int64 nNow = GetTime() * 1000000;
2809 while (!pto->mapAskFor.empty() && (*pto->mapAskFor.begin()).first <= nNow)
2811 const CInv& inv = (*pto->mapAskFor.begin()).second;
2812 if (!AlreadyHave(txdb, inv))
2814 printf("sending getdata: %s\n", inv.ToString().c_str());
2815 vGetData.push_back(inv);
2816 if (vGetData.size() >= 1000)
2818 pto->PushMessage("getdata", vGetData);
2822 mapAlreadyAskedFor[inv] = nNow;
2823 pto->mapAskFor.erase(pto->mapAskFor.begin());
2825 if (!vGetData.empty())
2826 pto->PushMessage("getdata", vGetData);
2845 //////////////////////////////////////////////////////////////////////////////
2850 int static FormatHashBlocks(void* pbuffer, unsigned int len)
2852 unsigned char* pdata = (unsigned char*)pbuffer;
2853 unsigned int blocks = 1 + ((len + 8) / 64);
2854 unsigned char* pend = pdata + 64 * blocks;
2855 memset(pdata + len, 0, 64 * blocks - len);
2857 unsigned int bits = len * 8;
2858 pend[-1] = (bits >> 0) & 0xff;
2859 pend[-2] = (bits >> 8) & 0xff;
2860 pend[-3] = (bits >> 16) & 0xff;
2861 pend[-4] = (bits >> 24) & 0xff;
2865 using CryptoPP::ByteReverse;
2867 static const unsigned int pSHA256InitState[8] =
2868 {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
2870 inline void SHA256Transform(void* pstate, void* pinput, const void* pinit)
2872 memcpy(pstate, pinit, 32);
2873 CryptoPP::SHA256::Transform((CryptoPP::word32*)pstate, (CryptoPP::word32*)pinput);
2877 // ScanHash scans nonces looking for a hash with at least some zero bits.
2878 // It operates on big endian data. Caller does the byte reversing.
2879 // All input buffers are 16-byte aligned. nNonce is usually preserved
2880 // between calls, but periodically or if nNonce is 0xffff0000 or above,
2881 // the block is rebuilt and nNonce starts over at zero.
2883 unsigned int static ScanHash_CryptoPP(char* pmidstate, char* pdata, char* phash1, char* phash, unsigned int& nHashesDone)
2885 unsigned int& nNonce = *(unsigned int*)(pdata + 12);
2889 // Hash pdata using pmidstate as the starting state into
2890 // preformatted buffer phash1, then hash phash1 into phash
2892 SHA256Transform(phash1, pdata, pmidstate);
2893 SHA256Transform(phash, phash1, pSHA256InitState);
2895 // Return the nonce if the hash has at least some zero bits,
2896 // caller will check if it has enough to reach the target
2897 if (((unsigned short*)phash)[14] == 0)
2900 // If nothing found after trying for a while, return -1
2901 if ((nNonce & 0xffff) == 0)
2903 nHashesDone = 0xffff+1;
2909 // Some explaining would be appreciated
2914 set<uint256> setDependsOn;
2917 COrphan(CTransaction* ptxIn)
2925 printf("COrphan(hash=%s, dPriority=%.1f)\n", ptx->GetHash().ToString().substr(0,10).c_str(), dPriority);
2926 BOOST_FOREACH(uint256 hash, setDependsOn)
2927 printf(" setDependsOn %s\n", hash.ToString().substr(0,10).c_str());
2932 CBlock* CreateNewBlock(CReserveKey& reservekey)
2934 CBlockIndex* pindexPrev = pindexBest;
2937 auto_ptr<CBlock> pblock(new CBlock());
2941 // Create coinbase tx
2943 txNew.vin.resize(1);
2944 txNew.vin[0].prevout.SetNull();
2945 txNew.vout.resize(1);
2946 txNew.vout[0].scriptPubKey << reservekey.GetReservedKey() << OP_CHECKSIG;
2948 // Add our coinbase tx as first transaction
2949 pblock->vtx.push_back(txNew);
2951 // Collect memory pool transactions into the block
2953 CRITICAL_BLOCK(cs_main)
2954 CRITICAL_BLOCK(cs_mapTransactions)
2958 // Priority order to process transactions
2959 list<COrphan> vOrphan; // list memory doesn't move
2960 map<uint256, vector<COrphan*> > mapDependers;
2961 multimap<double, CTransaction*> mapPriority;
2962 for (map<uint256, CTransaction>::iterator mi = mapTransactions.begin(); mi != mapTransactions.end(); ++mi)
2964 CTransaction& tx = (*mi).second;
2965 if (tx.IsCoinBase() || !tx.IsFinal())
2968 COrphan* porphan = NULL;
2969 double dPriority = 0;
2970 BOOST_FOREACH(const CTxIn& txin, tx.vin)
2972 // Read prev transaction
2973 CTransaction txPrev;
2975 if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
2977 // Has to wait for dependencies
2980 // Use list for automatic deletion
2981 vOrphan.push_back(COrphan(&tx));
2982 porphan = &vOrphan.back();
2984 mapDependers[txin.prevout.hash].push_back(porphan);
2985 porphan->setDependsOn.insert(txin.prevout.hash);
2988 int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
2990 // Read block header
2991 int nConf = txindex.GetDepthInMainChain();
2993 dPriority += (double)nValueIn * nConf;
2995 if (fDebug && GetBoolArg("-printpriority"))
2996 printf("priority nValueIn=%-12"PRI64d" nConf=%-5d dPriority=%-20.1f\n", nValueIn, nConf, dPriority);
2999 // Priority is sum(valuein * age) / txsize
3000 dPriority /= ::GetSerializeSize(tx, SER_NETWORK);
3003 porphan->dPriority = dPriority;
3005 mapPriority.insert(make_pair(-dPriority, &(*mi).second));
3007 if (fDebug && GetBoolArg("-printpriority"))
3009 printf("priority %-20.1f %s\n%s", dPriority, tx.GetHash().ToString().substr(0,10).c_str(), tx.ToString().c_str());
3016 // Collect transactions into block
3017 map<uint256, CTxIndex> mapTestPool;
3018 uint64 nBlockSize = 1000;
3019 int nBlockSigOps = 100;
3020 while (!mapPriority.empty())
3022 // Take highest priority transaction off priority queue
3023 double dPriority = -(*mapPriority.begin()).first;
3024 CTransaction& tx = *(*mapPriority.begin()).second;
3025 mapPriority.erase(mapPriority.begin());
3028 unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK);
3029 if (nBlockSize + nTxSize >= MAX_BLOCK_SIZE_GEN)
3032 // Legacy limits on sigOps:
3033 int nTxSigOps = tx.GetSigOpCount();
3034 if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
3037 // Transaction fee required depends on block size
3038 bool fAllowFree = (nBlockSize + nTxSize < 4000 || CTransaction::AllowFree(dPriority));
3039 int64 nMinFee = tx.GetMinFee(nBlockSize, fAllowFree);
3041 // Connecting shouldn't fail due to dependency on other memory pool transactions
3042 // because we're already processing them in order of dependency
3043 map<uint256, CTxIndex> mapTestPoolTmp(mapTestPool);
3045 MapPrevTx mapInputs;
3046 if (!tx.FetchInputs(txdb, mapTestPoolTmp, false, true, mapInputs, fInvalid))
3049 int64 nTxFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
3050 if (nTxFees < nMinFee)
3053 nTxSigOps += tx.GetP2SHSigOpCount(mapInputs);
3054 if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
3057 if (!tx.ConnectInputs(mapInputs, mapTestPoolTmp, CDiskTxPos(1,1,1), pindexPrev, false, true))
3059 mapTestPoolTmp[tx.GetHash()] = CTxIndex(CDiskTxPos(1,1,1), tx.vout.size());
3060 swap(mapTestPool, mapTestPoolTmp);
3063 pblock->vtx.push_back(tx);
3064 nBlockSize += nTxSize;
3065 nBlockSigOps += nTxSigOps;
3068 // Add transactions that depend on this one to the priority queue
3069 uint256 hash = tx.GetHash();
3070 if (mapDependers.count(hash))
3072 BOOST_FOREACH(COrphan* porphan, mapDependers[hash])
3074 if (!porphan->setDependsOn.empty())
3076 porphan->setDependsOn.erase(hash);
3077 if (porphan->setDependsOn.empty())
3078 mapPriority.insert(make_pair(-porphan->dPriority, porphan->ptx));
3084 pblock->vtx[0].vout[0].nValue = GetBlockValue(pindexPrev->nHeight+1, nFees);
3087 pblock->hashPrevBlock = pindexPrev->GetBlockHash();
3088 pblock->hashMerkleRoot = pblock->BuildMerkleTree();
3089 pblock->UpdateTime(pindexPrev);
3090 pblock->nBits = GetNextWorkRequired(pindexPrev, pblock.get());
3093 return pblock.release();
3097 void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce)
3099 // Update nExtraNonce
3100 static uint256 hashPrevBlock;
3101 if (hashPrevBlock != pblock->hashPrevBlock)
3104 hashPrevBlock = pblock->hashPrevBlock;
3107 pblock->vtx[0].vin[0].scriptSig = CScript() << pblock->nTime << CBigNum(nExtraNonce);
3108 pblock->hashMerkleRoot = pblock->BuildMerkleTree();
3112 void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1)
3115 // Prebuild hash buffers
3122 uint256 hashPrevBlock;
3123 uint256 hashMerkleRoot;
3126 unsigned int nNonce;
3129 unsigned char pchPadding0[64];
3131 unsigned char pchPadding1[64];
3134 memset(&tmp, 0, sizeof(tmp));
3136 tmp.block.nVersion = pblock->nVersion;
3137 tmp.block.hashPrevBlock = pblock->hashPrevBlock;
3138 tmp.block.hashMerkleRoot = pblock->hashMerkleRoot;
3139 tmp.block.nTime = pblock->nTime;
3140 tmp.block.nBits = pblock->nBits;
3141 tmp.block.nNonce = pblock->nNonce;
3143 FormatHashBlocks(&tmp.block, sizeof(tmp.block));
3144 FormatHashBlocks(&tmp.hash1, sizeof(tmp.hash1));
3146 // Byte swap all the input buffer
3147 for (unsigned int i = 0; i < sizeof(tmp)/4; i++)
3148 ((unsigned int*)&tmp)[i] = ByteReverse(((unsigned int*)&tmp)[i]);
3150 // Precalc the first half of the first hash, which stays constant
3151 SHA256Transform(pmidstate, &tmp.block, pSHA256InitState);
3153 memcpy(pdata, &tmp.block, 128);
3154 memcpy(phash1, &tmp.hash1, 64);
3158 bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
3160 uint256 hash = pblock->GetHash();
3161 uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
3163 if (hash > hashTarget)
3167 printf("BitcoinMiner:\n");
3168 printf("proof-of-work found \n hash: %s \ntarget: %s\n", hash.GetHex().c_str(), hashTarget.GetHex().c_str());
3170 printf("%s ", DateTimeStrFormat("%x %H:%M", GetTime()).c_str());
3171 printf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue).c_str());
3174 CRITICAL_BLOCK(cs_main)
3176 if (pblock->hashPrevBlock != hashBestChain)
3177 return error("BitcoinMiner : generated block is stale");
3179 // Remove key from key pool
3180 reservekey.KeepKey();
3182 // Track how many getdata requests this block gets
3183 CRITICAL_BLOCK(wallet.cs_wallet)
3184 wallet.mapRequestCount[pblock->GetHash()] = 0;
3186 // Process this block the same as if we had received it from another node
3187 if (!ProcessBlock(NULL, pblock))
3188 return error("BitcoinMiner : ProcessBlock, block not accepted");
3195 void static ThreadBitcoinMiner(void* parg);
3197 void static BitcoinMiner(CWallet *pwallet)
3199 printf("BitcoinMiner started\n");
3200 SetThreadPriority(THREAD_PRIORITY_LOWEST);
3202 // Each thread has its own key and counter
3203 CReserveKey reservekey(pwallet);
3204 unsigned int nExtraNonce = 0;
3206 while (fGenerateBitcoins)
3208 if (AffinityBugWorkaround(ThreadBitcoinMiner))
3212 while (vNodes.empty() || IsInitialBlockDownload())
3217 if (!fGenerateBitcoins)
3225 unsigned int nTransactionsUpdatedLast = nTransactionsUpdated;
3226 CBlockIndex* pindexPrev = pindexBest;
3228 auto_ptr<CBlock> pblock(CreateNewBlock(reservekey));
3231 IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce);
3233 printf("Running BitcoinMiner with %d transactions in block\n", pblock->vtx.size());
3237 // Prebuild hash buffers
3239 char pmidstatebuf[32+16]; char* pmidstate = alignup<16>(pmidstatebuf);
3240 char pdatabuf[128+16]; char* pdata = alignup<16>(pdatabuf);
3241 char phash1buf[64+16]; char* phash1 = alignup<16>(phash1buf);
3243 FormatHashBuffers(pblock.get(), pmidstate, pdata, phash1);
3245 unsigned int& nBlockTime = *(unsigned int*)(pdata + 64 + 4);
3246 unsigned int& nBlockBits = *(unsigned int*)(pdata + 64 + 8);
3247 unsigned int& nBlockNonce = *(unsigned int*)(pdata + 64 + 12);
3253 int64 nStart = GetTime();
3254 uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
3256 uint256& hash = *alignup<16>(hashbuf);
3259 unsigned int nHashesDone = 0;
3260 unsigned int nNonceFound;
3263 nNonceFound = ScanHash_CryptoPP(pmidstate, pdata + 64, phash1,
3264 (char*)&hash, nHashesDone);
3266 // Check if something found
3267 if (nNonceFound != -1)
3269 for (unsigned int i = 0; i < sizeof(hash)/4; i++)
3270 ((unsigned int*)&hash)[i] = ByteReverse(((unsigned int*)&hash)[i]);
3272 if (hash <= hashTarget)
3275 pblock->nNonce = ByteReverse(nNonceFound);
3276 assert(hash == pblock->GetHash());
3278 SetThreadPriority(THREAD_PRIORITY_NORMAL);
3279 CheckWork(pblock.get(), *pwalletMain, reservekey);
3280 SetThreadPriority(THREAD_PRIORITY_LOWEST);
3286 static int64 nHashCounter;
3287 if (nHPSTimerStart == 0)
3289 nHPSTimerStart = GetTimeMillis();
3293 nHashCounter += nHashesDone;
3294 if (GetTimeMillis() - nHPSTimerStart > 4000)
3296 static CCriticalSection cs;
3299 if (GetTimeMillis() - nHPSTimerStart > 4000)
3301 dHashesPerSec = 1000.0 * nHashCounter / (GetTimeMillis() - nHPSTimerStart);
3302 nHPSTimerStart = GetTimeMillis();
3304 string strStatus = strprintf(" %.0f khash/s", dHashesPerSec/1000.0);
3305 UIThreadCall(boost::bind(CalledSetStatusBar, strStatus, 0));
3306 static int64 nLogTime;
3307 if (GetTime() - nLogTime > 30 * 60)
3309 nLogTime = GetTime();
3310 printf("%s ", DateTimeStrFormat("%x %H:%M", GetTime()).c_str());
3311 printf("hashmeter %3d CPUs %6.0f khash/s\n", vnThreadsRunning[3], dHashesPerSec/1000.0);
3317 // Check for stop or if block needs to be rebuilt
3320 if (!fGenerateBitcoins)
3322 if (fLimitProcessors && vnThreadsRunning[3] > nLimitProcessors)
3326 if (nBlockNonce >= 0xffff0000)
3328 if (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 60)
3330 if (pindexPrev != pindexBest)
3333 // Update nTime every few seconds
3334 pblock->UpdateTime(pindexPrev);
3335 nBlockTime = ByteReverse(pblock->nTime);
3338 // Changing pblock->nTime can change work required on testnet:
3339 nBlockBits = ByteReverse(pblock->nBits);
3340 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
3346 void static ThreadBitcoinMiner(void* parg)
3348 CWallet* pwallet = (CWallet*)parg;
3351 vnThreadsRunning[3]++;
3352 BitcoinMiner(pwallet);
3353 vnThreadsRunning[3]--;
3355 catch (std::exception& e) {
3356 vnThreadsRunning[3]--;
3357 PrintException(&e, "ThreadBitcoinMiner()");
3359 vnThreadsRunning[3]--;
3360 PrintException(NULL, "ThreadBitcoinMiner()");
3362 UIThreadCall(boost::bind(CalledSetStatusBar, "", 0));
3364 if (vnThreadsRunning[3] == 0)
3366 printf("ThreadBitcoinMiner exiting, %d threads remaining\n", vnThreadsRunning[3]);
3370 void GenerateBitcoins(bool fGenerate, CWallet* pwallet)
3372 if (fGenerateBitcoins != fGenerate)
3374 fGenerateBitcoins = fGenerate;
3375 WriteSetting("fGenerateBitcoins", fGenerateBitcoins);
3378 if (fGenerateBitcoins)
3380 int nProcessors = boost::thread::hardware_concurrency();
3381 printf("%d processors\n", nProcessors);
3382 if (nProcessors < 1)
3384 if (fLimitProcessors && nProcessors > nLimitProcessors)
3385 nProcessors = nLimitProcessors;
3386 int nAddThreads = nProcessors - vnThreadsRunning[3];
3387 printf("Starting %d BitcoinMiner threads\n", nAddThreads);
3388 for (int i = 0; i < nAddThreads; i++)
3390 if (!CreateThread(ThreadBitcoinMiner, pwallet))
3391 printf("Error: CreateThread(ThreadBitcoinMiner) failed\n");