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 COPYING or http://www.opensource.org/licenses/mit-license.php.
6 #include "checkpoints.h"
10 #include "ui_interface.h"
11 #include <boost/algorithm/string/replace.hpp>
12 #include <boost/filesystem.hpp>
13 #include <boost/filesystem/fstream.hpp>
16 using namespace boost;
22 CCriticalSection cs_setpwalletRegistered;
23 set<CWallet*> setpwalletRegistered;
25 CCriticalSection cs_main;
28 unsigned int nTransactionsUpdated = 0;
30 map<uint256, CBlockIndex*> mapBlockIndex;
31 uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f");
32 static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
33 CBlockIndex* pindexGenesisBlock = NULL;
35 CBigNum bnBestChainWork = 0;
36 CBigNum bnBestInvalidWork = 0;
37 uint256 hashBestChain = 0;
38 CBlockIndex* pindexBest = NULL;
39 int64 nTimeBestReceived = 0;
41 CMedianFilter<int> cPeerBlockCounts(5, 0); // Amount of blocks that other nodes claim to have
43 map<uint256, CBlock*> mapOrphanBlocks;
44 multimap<uint256, CBlock*> mapOrphanBlocksByPrev;
46 map<uint256, CDataStream*> mapOrphanTransactions;
47 multimap<uint256, CDataStream*> mapOrphanTransactionsByPrev;
49 // Constant stuff for coinbase transactions we create:
50 CScript COINBASE_FLAGS;
52 const string strMessageMagic = "Bitcoin Signed Message:\n";
58 int64 nTransactionFee = 0;
62 //////////////////////////////////////////////////////////////////////////////
64 // dispatching functions
67 // These functions dispatch to one or all registered wallets
70 void RegisterWallet(CWallet* pwalletIn)
73 LOCK(cs_setpwalletRegistered);
74 setpwalletRegistered.insert(pwalletIn);
78 void UnregisterWallet(CWallet* pwalletIn)
81 LOCK(cs_setpwalletRegistered);
82 setpwalletRegistered.erase(pwalletIn);
86 // check whether the passed transaction is from us
87 bool static IsFromMe(CTransaction& tx)
89 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
90 if (pwallet->IsFromMe(tx))
95 // get the wallet transaction with the given hash (if it exists)
96 bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
98 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
99 if (pwallet->GetTransaction(hashTx,wtx))
104 // erases transaction with the given hash from all wallets
105 void static EraseFromWallets(uint256 hash)
107 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
108 pwallet->EraseFromWallet(hash);
111 // make sure all wallets know about the given transaction, in the given block
112 void static SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL, bool fUpdate = false)
114 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
115 pwallet->AddToWalletIfInvolvingMe(tx, pblock, fUpdate);
118 // notify wallets about a new best chain
119 void static SetBestChain(const CBlockLocator& loc)
121 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
122 pwallet->SetBestChain(loc);
125 // notify wallets about an updated transaction
126 void static UpdatedTransaction(const uint256& hashTx)
128 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
129 pwallet->UpdatedTransaction(hashTx);
133 void static PrintWallets(const CBlock& block)
135 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
136 pwallet->PrintWallet(block);
139 // notify wallets about an incoming inventory (for request counts)
140 void static Inventory(const uint256& hash)
142 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
143 pwallet->Inventory(hash);
146 // ask wallets to resend their transactions
147 void static ResendWalletTransactions()
149 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
150 pwallet->ResendWalletTransactions();
159 //////////////////////////////////////////////////////////////////////////////
161 // mapOrphanTransactions
164 void AddOrphanTx(const CDataStream& vMsg)
167 CDataStream(vMsg) >> tx;
168 uint256 hash = tx.GetHash();
169 if (mapOrphanTransactions.count(hash))
172 CDataStream* pvMsg = mapOrphanTransactions[hash] = new CDataStream(vMsg);
173 BOOST_FOREACH(const CTxIn& txin, tx.vin)
174 mapOrphanTransactionsByPrev.insert(make_pair(txin.prevout.hash, pvMsg));
177 void static EraseOrphanTx(uint256 hash)
179 if (!mapOrphanTransactions.count(hash))
181 const CDataStream* pvMsg = mapOrphanTransactions[hash];
183 CDataStream(*pvMsg) >> tx;
184 BOOST_FOREACH(const CTxIn& txin, tx.vin)
186 for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(txin.prevout.hash);
187 mi != mapOrphanTransactionsByPrev.upper_bound(txin.prevout.hash);)
189 if ((*mi).second == pvMsg)
190 mapOrphanTransactionsByPrev.erase(mi++);
196 mapOrphanTransactions.erase(hash);
199 unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
201 unsigned int nEvicted = 0;
202 while (mapOrphanTransactions.size() > nMaxOrphans)
204 // Evict a random orphan:
205 std::vector<unsigned char> randbytes(32);
206 RAND_bytes(&randbytes[0], 32);
207 uint256 randomhash(randbytes);
208 map<uint256, CDataStream*>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
209 if (it == mapOrphanTransactions.end())
210 it = mapOrphanTransactions.begin();
211 EraseOrphanTx(it->first);
223 //////////////////////////////////////////////////////////////////////////////
225 // CTransaction and CTxIndex
228 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet)
231 if (!txdb.ReadTxIndex(prevout.hash, txindexRet))
233 if (!ReadFromDisk(txindexRet.pos))
235 if (prevout.n >= vout.size())
243 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout)
246 return ReadFromDisk(txdb, prevout, txindex);
249 bool CTransaction::ReadFromDisk(COutPoint prevout)
253 return ReadFromDisk(txdb, prevout, txindex);
256 bool CTransaction::IsStandard() const
258 BOOST_FOREACH(const CTxIn& txin, vin)
260 // Biggest 'standard' txin is a 3-signature 3-of-3 CHECKMULTISIG
261 // pay-to-script-hash, which is 3 ~80-byte signatures, 3
262 // ~65-byte public keys, plus a few script ops.
263 if (txin.scriptSig.size() > 500)
265 if (!txin.scriptSig.IsPushOnly())
268 BOOST_FOREACH(const CTxOut& txout, vout)
269 if (!::IsStandard(txout.scriptPubKey))
275 // Check transaction inputs, and make sure any
276 // pay-to-script-hash transactions are evaluating IsStandard scripts
278 // Why bother? To avoid denial-of-service attacks; an attacker
279 // can submit a standard HASH... OP_EQUAL transaction,
280 // which will get accepted into blocks. The redemption
281 // script can be anything; an attacker could use a very
282 // expensive-to-check-upon-redemption script like:
283 // DUP CHECKSIG DROP ... repeated 100 times... OP_1
285 bool CTransaction::AreInputsStandard(const MapPrevTx& mapInputs) const
288 return true; // Coinbases don't use vin normally
290 for (unsigned int i = 0; i < vin.size(); i++)
292 const CTxOut& prev = GetOutputFor(vin[i], mapInputs);
294 vector<vector<unsigned char> > vSolutions;
295 txnouttype whichType;
296 // get the scriptPubKey corresponding to this input:
297 const CScript& prevScript = prev.scriptPubKey;
298 if (!Solver(prevScript, whichType, vSolutions))
300 int nArgsExpected = ScriptSigArgsExpected(whichType, vSolutions);
301 if (nArgsExpected < 0)
304 // Transactions with extra stuff in their scriptSigs are
305 // non-standard. Note that this EvalScript() call will
306 // be quick, because if there are any operations
307 // beside "push data" in the scriptSig the
308 // IsStandard() call returns false
309 vector<vector<unsigned char> > stack;
310 if (!EvalScript(stack, vin[i].scriptSig, *this, i, 0))
313 if (whichType == TX_SCRIPTHASH)
317 CScript subscript(stack.back().begin(), stack.back().end());
318 vector<vector<unsigned char> > vSolutions2;
319 txnouttype whichType2;
320 if (!Solver(subscript, whichType2, vSolutions2))
322 if (whichType2 == TX_SCRIPTHASH)
326 tmpExpected = ScriptSigArgsExpected(whichType2, vSolutions2);
329 nArgsExpected += tmpExpected;
332 if (stack.size() != (unsigned int)nArgsExpected)
340 CTransaction::GetLegacySigOpCount() const
342 unsigned int nSigOps = 0;
343 BOOST_FOREACH(const CTxIn& txin, vin)
345 nSigOps += txin.scriptSig.GetSigOpCount(false);
347 BOOST_FOREACH(const CTxOut& txout, vout)
349 nSigOps += txout.scriptPubKey.GetSigOpCount(false);
355 int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
367 // Load the block this tx is in
369 if (!CTxDB("r").ReadTxIndex(GetHash(), txindex))
371 if (!blockTmp.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos))
376 // Update the tx's hashBlock
377 hashBlock = pblock->GetHash();
379 // Locate the transaction
380 for (nIndex = 0; nIndex < (int)pblock->vtx.size(); nIndex++)
381 if (pblock->vtx[nIndex] == *(CTransaction*)this)
383 if (nIndex == (int)pblock->vtx.size())
385 vMerkleBranch.clear();
387 printf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
391 // Fill in merkle branch
392 vMerkleBranch = pblock->GetMerkleBranch(nIndex);
395 // Is the tx in a block that's in the main chain
396 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
397 if (mi == mapBlockIndex.end())
399 CBlockIndex* pindex = (*mi).second;
400 if (!pindex || !pindex->IsInMainChain())
403 return pindexBest->nHeight - pindex->nHeight + 1;
412 bool CTransaction::CheckTransaction() const
414 // Basic checks that don't depend on any context
416 return DoS(10, error("CTransaction::CheckTransaction() : vin empty"));
418 return DoS(10, error("CTransaction::CheckTransaction() : vout empty"));
420 if (::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
421 return DoS(100, error("CTransaction::CheckTransaction() : size limits failed"));
423 // Check for negative or overflow output values
425 BOOST_FOREACH(const CTxOut& txout, vout)
427 if (txout.nValue < 0)
428 return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue negative"));
429 if (txout.nValue > MAX_MONEY)
430 return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue too high"));
431 nValueOut += txout.nValue;
432 if (!MoneyRange(nValueOut))
433 return DoS(100, error("CTransaction::CheckTransaction() : txout total out of range"));
436 // Check for duplicate inputs
437 set<COutPoint> vInOutPoints;
438 BOOST_FOREACH(const CTxIn& txin, vin)
440 if (vInOutPoints.count(txin.prevout))
442 vInOutPoints.insert(txin.prevout);
447 if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
448 return DoS(100, error("CTransaction::CheckTransaction() : coinbase script size"));
452 BOOST_FOREACH(const CTxIn& txin, vin)
453 if (txin.prevout.IsNull())
454 return DoS(10, error("CTransaction::CheckTransaction() : prevout is null"));
460 bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
461 bool* pfMissingInputs)
464 *pfMissingInputs = false;
466 if (!tx.CheckTransaction())
467 return error("CTxMemPool::accept() : CheckTransaction failed");
469 // Coinbase is only valid in a block, not as a loose transaction
471 return tx.DoS(100, error("CTxMemPool::accept() : coinbase as individual tx"));
473 // To help v0.1.5 clients who would see it as a negative number
474 if ((int64)tx.nLockTime > std::numeric_limits<int>::max())
475 return error("CTxMemPool::accept() : not accepting nLockTime beyond 2038 yet");
477 // Rather not work on nonstandard transactions (unless -testnet)
478 if (!fTestNet && !tx.IsStandard())
479 return error("CTxMemPool::accept() : nonstandard transaction type");
481 // Do we already have it?
482 uint256 hash = tx.GetHash();
485 if (mapTx.count(hash))
489 if (txdb.ContainsTx(hash))
492 // Check for conflicts with in-memory transactions
493 CTransaction* ptxOld = NULL;
494 for (unsigned int i = 0; i < tx.vin.size(); i++)
496 COutPoint outpoint = tx.vin[i].prevout;
497 if (mapNextTx.count(outpoint))
499 // Disable replacement feature for now
502 // Allow replacing with a newer version of the same transaction
505 ptxOld = mapNextTx[outpoint].ptx;
506 if (ptxOld->IsFinal())
508 if (!tx.IsNewerThan(*ptxOld))
510 for (unsigned int i = 0; i < tx.vin.size(); i++)
512 COutPoint outpoint = tx.vin[i].prevout;
513 if (!mapNextTx.count(outpoint) || mapNextTx[outpoint].ptx != ptxOld)
523 map<uint256, CTxIndex> mapUnused;
524 bool fInvalid = false;
525 if (!tx.FetchInputs(txdb, mapUnused, false, false, mapInputs, fInvalid))
528 return error("CTxMemPool::accept() : FetchInputs found invalid tx %s", hash.ToString().substr(0,10).c_str());
530 *pfMissingInputs = true;
534 // Check for non-standard pay-to-script-hash in inputs
535 if (!tx.AreInputsStandard(mapInputs) && !fTestNet)
536 return error("CTxMemPool::accept() : nonstandard transaction input");
538 // Note: if you modify this code to accept non-standard transactions, then
539 // you should add code here to check that the transaction does a
540 // reasonable number of ECDSA signature verifications.
542 int64 nFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
543 unsigned int nSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
545 // Don't accept it if it can't get into a block
546 if (nFees < tx.GetMinFee(1000, true, GMF_RELAY))
547 return error("CTxMemPool::accept() : not enough fees");
549 // Continuously rate-limit free transactions
550 // This mitigates 'penny-flooding' -- sending thousands of free transactions just to
551 // be annoying or make other's transactions take longer to confirm.
552 if (nFees < MIN_RELAY_TX_FEE)
554 static CCriticalSection cs;
555 static double dFreeCount;
556 static int64 nLastTime;
557 int64 nNow = GetTime();
561 // Use an exponentially decaying ~10-minute window:
562 dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
564 // -limitfreerelay unit is thousand-bytes-per-minute
565 // At default rate it would take over a month to fill 1GB
566 if (dFreeCount > GetArg("-limitfreerelay", 15)*10*1000 && !IsFromMe(tx))
567 return error("CTxMemPool::accept() : free transaction rejected by rate limiter");
569 printf("Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
574 // Check against previous transactions
575 // This is done last to help prevent CPU exhaustion denial-of-service attacks.
576 if (!tx.ConnectInputs(mapInputs, mapUnused, CDiskTxPos(1,1,1), pindexBest, false, false))
578 return error("CTxMemPool::accept() : ConnectInputs failed %s", hash.ToString().substr(0,10).c_str());
582 // Store transaction in memory
587 printf("CTxMemPool::accept() : replacing tx %s with new version\n", ptxOld->GetHash().ToString().c_str());
593 ///// are we sure this is ok when loading transactions or restoring block txes
594 // If updated, erase old tx from wallet
596 EraseFromWallets(ptxOld->GetHash());
598 printf("CTxMemPool::accept() : accepted %s (poolsz %u)\n",
599 hash.ToString().substr(0,10).c_str(),
604 bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMissingInputs)
606 return mempool.accept(txdb, *this, fCheckInputs, pfMissingInputs);
609 bool CTxMemPool::addUnchecked(CTransaction &tx)
611 // Add to memory pool without checking anything. Don't call this directly,
612 // call CTxMemPool::accept to properly check the transaction first.
615 uint256 hash = tx.GetHash();
617 for (unsigned int i = 0; i < tx.vin.size(); i++)
618 mapNextTx[tx.vin[i].prevout] = CInPoint(&mapTx[hash], i);
619 nTransactionsUpdated++;
625 bool CTxMemPool::remove(CTransaction &tx)
627 // Remove transaction from memory pool
630 uint256 hash = tx.GetHash();
631 if (mapTx.count(hash))
633 BOOST_FOREACH(const CTxIn& txin, tx.vin)
634 mapNextTx.erase(txin.prevout);
636 nTransactionsUpdated++;
647 int CMerkleTx::GetDepthInMainChain(CBlockIndex* &pindexRet) const
649 if (hashBlock == 0 || nIndex == -1)
652 // Find the block it claims to be in
653 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
654 if (mi == mapBlockIndex.end())
656 CBlockIndex* pindex = (*mi).second;
657 if (!pindex || !pindex->IsInMainChain())
660 // Make sure the merkle branch connects to this block
661 if (!fMerkleVerified)
663 if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != pindex->hashMerkleRoot)
665 fMerkleVerified = true;
669 return pindexBest->nHeight - pindex->nHeight + 1;
673 int CMerkleTx::GetBlocksToMaturity() const
677 return max(0, (COINBASE_MATURITY+20) - GetDepthInMainChain());
681 bool CMerkleTx::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs)
685 if (!IsInMainChain() && !ClientConnectInputs())
687 return CTransaction::AcceptToMemoryPool(txdb, false);
691 return CTransaction::AcceptToMemoryPool(txdb, fCheckInputs);
695 bool CMerkleTx::AcceptToMemoryPool()
698 return AcceptToMemoryPool(txdb);
703 bool CWalletTx::AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs)
708 // Add previous supporting transactions first
709 BOOST_FOREACH(CMerkleTx& tx, vtxPrev)
711 if (!tx.IsCoinBase())
713 uint256 hash = tx.GetHash();
714 if (!mempool.exists(hash) && !txdb.ContainsTx(hash))
715 tx.AcceptToMemoryPool(txdb, fCheckInputs);
718 return AcceptToMemoryPool(txdb, fCheckInputs);
723 bool CWalletTx::AcceptWalletTransaction()
726 return AcceptWalletTransaction(txdb);
729 int CTxIndex::GetDepthInMainChain() const
733 if (!block.ReadFromDisk(pos.nFile, pos.nBlockPos, false))
735 // Find the block in the index
736 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(block.GetHash());
737 if (mi == mapBlockIndex.end())
739 CBlockIndex* pindex = (*mi).second;
740 if (!pindex || !pindex->IsInMainChain())
742 return 1 + nBestHeight - pindex->nHeight;
745 // Return transaction in tx, and if it was found inside a block, its hash is placed in hashBlock
746 bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock)
752 if (mempool.exists(hash))
754 tx = mempool.lookup(hash);
760 if (tx.ReadFromDisk(txdb, COutPoint(hash, 0), txindex))
763 if (block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
764 hashBlock = block.GetHash();
778 //////////////////////////////////////////////////////////////////////////////
780 // CBlock and CBlockIndex
783 bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
785 if (!fReadTransactions)
787 *this = pindex->GetBlockHeader();
790 if (!ReadFromDisk(pindex->nFile, pindex->nBlockPos, fReadTransactions))
792 if (GetHash() != pindex->GetBlockHash())
793 return error("CBlock::ReadFromDisk() : GetHash() doesn't match index");
797 uint256 static GetOrphanRoot(const CBlock* pblock)
799 // Work back to the first block in the orphan chain
800 while (mapOrphanBlocks.count(pblock->hashPrevBlock))
801 pblock = mapOrphanBlocks[pblock->hashPrevBlock];
802 return pblock->GetHash();
805 int64 static GetBlockValue(int nHeight, int64 nFees)
807 int64 nSubsidy = 50 * COIN;
809 // Subsidy is cut in half every 4 years
810 nSubsidy >>= (nHeight / 210000);
812 return nSubsidy + nFees;
815 static const int64 nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
816 static const int64 nTargetSpacing = 10 * 60;
817 static const int64 nInterval = nTargetTimespan / nTargetSpacing;
820 // minimum amount of work that could possibly be required nTime after
821 // minimum work required was nBase
823 unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
825 // Testnet has min-difficulty blocks
826 // after nTargetSpacing*2 time between blocks:
827 if (fTestNet && nTime > nTargetSpacing*2)
828 return bnProofOfWorkLimit.GetCompact();
831 bnResult.SetCompact(nBase);
832 while (nTime > 0 && bnResult < bnProofOfWorkLimit)
834 // Maximum 400% adjustment...
836 // ... in best-case exactly 4-times-normal target time
837 nTime -= nTargetTimespan*4;
839 if (bnResult > bnProofOfWorkLimit)
840 bnResult = bnProofOfWorkLimit;
841 return bnResult.GetCompact();
844 unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlock *pblock)
846 unsigned int nProofOfWorkLimit = bnProofOfWorkLimit.GetCompact();
849 if (pindexLast == NULL)
850 return nProofOfWorkLimit;
852 // Only change once per interval
853 if ((pindexLast->nHeight+1) % nInterval != 0)
855 // Special rules for testnet after 15 Feb 2012:
856 if (fTestNet && pblock->nTime > 1329264000)
858 // If the new block's timestamp is more than 2* 10 minutes
859 // then allow mining of a min-difficulty block.
860 if (pblock->nTime - pindexLast->nTime > nTargetSpacing*2)
861 return nProofOfWorkLimit;
864 // Return the last non-special-min-difficulty-rules-block
865 const CBlockIndex* pindex = pindexLast;
866 while (pindex->pprev && pindex->nHeight % nInterval != 0 && pindex->nBits == nProofOfWorkLimit)
867 pindex = pindex->pprev;
868 return pindex->nBits;
872 return pindexLast->nBits;
875 // Go back by what we want to be 14 days worth of blocks
876 const CBlockIndex* pindexFirst = pindexLast;
877 for (int i = 0; pindexFirst && i < nInterval-1; i++)
878 pindexFirst = pindexFirst->pprev;
881 // Limit adjustment step
882 int64 nActualTimespan = pindexLast->GetBlockTime() - pindexFirst->GetBlockTime();
883 printf(" nActualTimespan = %"PRI64d" before bounds\n", nActualTimespan);
884 if (nActualTimespan < nTargetTimespan/4)
885 nActualTimespan = nTargetTimespan/4;
886 if (nActualTimespan > nTargetTimespan*4)
887 nActualTimespan = nTargetTimespan*4;
891 bnNew.SetCompact(pindexLast->nBits);
892 bnNew *= nActualTimespan;
893 bnNew /= nTargetTimespan;
895 if (bnNew > bnProofOfWorkLimit)
896 bnNew = bnProofOfWorkLimit;
899 printf("GetNextWorkRequired RETARGET\n");
900 printf("nTargetTimespan = %"PRI64d" nActualTimespan = %"PRI64d"\n", nTargetTimespan, nActualTimespan);
901 printf("Before: %08x %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().ToString().c_str());
902 printf("After: %08x %s\n", bnNew.GetCompact(), bnNew.getuint256().ToString().c_str());
904 return bnNew.GetCompact();
907 bool CheckProofOfWork(uint256 hash, unsigned int nBits)
910 bnTarget.SetCompact(nBits);
913 if (bnTarget <= 0 || bnTarget > bnProofOfWorkLimit)
914 return error("CheckProofOfWork() : nBits below minimum work");
916 // Check proof of work matches claimed amount
917 if (hash > bnTarget.getuint256())
918 return error("CheckProofOfWork() : hash doesn't match nBits");
923 // Return maximum amount of blocks that other nodes claim to have
924 int GetNumBlocksOfPeers()
926 return std::max(cPeerBlockCounts.median(), Checkpoints::GetTotalBlocksEstimate());
929 bool IsInitialBlockDownload()
931 if (pindexBest == NULL || nBestHeight < Checkpoints::GetTotalBlocksEstimate())
933 static int64 nLastUpdate;
934 static CBlockIndex* pindexLastBest;
935 if (pindexBest != pindexLastBest)
937 pindexLastBest = pindexBest;
938 nLastUpdate = GetTime();
940 return (GetTime() - nLastUpdate < 10 &&
941 pindexBest->GetBlockTime() < GetTime() - 24 * 60 * 60);
944 void static InvalidChainFound(CBlockIndex* pindexNew)
946 if (pindexNew->bnChainWork > bnBestInvalidWork)
948 bnBestInvalidWork = pindexNew->bnChainWork;
949 CTxDB().WriteBestInvalidWork(bnBestInvalidWork);
950 uiInterface.NotifyBlocksChanged();
952 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());
953 printf("InvalidChainFound: current best=%s height=%d work=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainWork.ToString().c_str());
954 if (pindexBest && bnBestInvalidWork > bnBestChainWork + pindexBest->GetBlockWork() * 6)
955 printf("InvalidChainFound: WARNING: Displayed transactions may not be correct! You may need to upgrade, or other nodes may need to upgrade.\n");
958 void CBlock::UpdateTime(const CBlockIndex* pindexPrev)
960 nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
962 // Updating time can change work required on testnet:
964 nBits = GetNextWorkRequired(pindexPrev, this);
977 bool CTransaction::DisconnectInputs(CTxDB& txdb)
979 // Relinquish previous transactions' spent pointers
982 BOOST_FOREACH(const CTxIn& txin, vin)
984 COutPoint prevout = txin.prevout;
986 // Get prev txindex from disk
988 if (!txdb.ReadTxIndex(prevout.hash, txindex))
989 return error("DisconnectInputs() : ReadTxIndex failed");
991 if (prevout.n >= txindex.vSpent.size())
992 return error("DisconnectInputs() : prevout.n out of range");
994 // Mark outpoint as not spent
995 txindex.vSpent[prevout.n].SetNull();
998 if (!txdb.UpdateTxIndex(prevout.hash, txindex))
999 return error("DisconnectInputs() : UpdateTxIndex failed");
1003 // Remove transaction from index
1004 // This can fail if a duplicate of this transaction was in a chain that got
1005 // reorganized away. This is only possible if this transaction was completely
1006 // spent, so erasing it would be a no-op anway.
1007 txdb.EraseTxIndex(*this);
1013 bool CTransaction::FetchInputs(CTxDB& txdb, const map<uint256, CTxIndex>& mapTestPool,
1014 bool fBlock, bool fMiner, MapPrevTx& inputsRet, bool& fInvalid)
1016 // FetchInputs can return false either because we just haven't seen some inputs
1017 // (in which case the transaction should be stored as an orphan)
1018 // or because the transaction is malformed (in which case the transaction should
1019 // be dropped). If tx is definitely invalid, fInvalid will be set to true.
1023 return true; // Coinbase transactions have no inputs to fetch.
1025 for (unsigned int i = 0; i < vin.size(); i++)
1027 COutPoint prevout = vin[i].prevout;
1028 if (inputsRet.count(prevout.hash))
1029 continue; // Got it already
1032 CTxIndex& txindex = inputsRet[prevout.hash].first;
1034 if ((fBlock || fMiner) && mapTestPool.count(prevout.hash))
1036 // Get txindex from current proposed changes
1037 txindex = mapTestPool.find(prevout.hash)->second;
1041 // Read txindex from txdb
1042 fFound = txdb.ReadTxIndex(prevout.hash, txindex);
1044 if (!fFound && (fBlock || fMiner))
1045 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());
1048 CTransaction& txPrev = inputsRet[prevout.hash].second;
1049 if (!fFound || txindex.pos == CDiskTxPos(1,1,1))
1051 // Get prev tx from single transactions in memory
1054 if (!mempool.exists(prevout.hash))
1055 return error("FetchInputs() : %s mempool Tx prev not found %s", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
1056 txPrev = mempool.lookup(prevout.hash);
1059 txindex.vSpent.resize(txPrev.vout.size());
1063 // Get prev tx from disk
1064 if (!txPrev.ReadFromDisk(txindex.pos))
1065 return error("FetchInputs() : %s ReadFromDisk prev tx %s failed", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
1069 // Make sure all prevout.n's are valid:
1070 for (unsigned int i = 0; i < vin.size(); i++)
1072 const COutPoint prevout = vin[i].prevout;
1073 assert(inputsRet.count(prevout.hash) != 0);
1074 const CTxIndex& txindex = inputsRet[prevout.hash].first;
1075 const CTransaction& txPrev = inputsRet[prevout.hash].second;
1076 if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
1078 // Revisit this if/when transaction replacement is implemented and allows
1081 return DoS(100, 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()));
1088 const CTxOut& CTransaction::GetOutputFor(const CTxIn& input, const MapPrevTx& inputs) const
1090 MapPrevTx::const_iterator mi = inputs.find(input.prevout.hash);
1091 if (mi == inputs.end())
1092 throw std::runtime_error("CTransaction::GetOutputFor() : prevout.hash not found");
1094 const CTransaction& txPrev = (mi->second).second;
1095 if (input.prevout.n >= txPrev.vout.size())
1096 throw std::runtime_error("CTransaction::GetOutputFor() : prevout.n out of range");
1098 return txPrev.vout[input.prevout.n];
1101 int64 CTransaction::GetValueIn(const MapPrevTx& inputs) const
1107 for (unsigned int i = 0; i < vin.size(); i++)
1109 nResult += GetOutputFor(vin[i], inputs).nValue;
1115 unsigned int CTransaction::GetP2SHSigOpCount(const MapPrevTx& inputs) const
1120 unsigned int nSigOps = 0;
1121 for (unsigned int i = 0; i < vin.size(); i++)
1123 const CTxOut& prevout = GetOutputFor(vin[i], inputs);
1124 if (prevout.scriptPubKey.IsPayToScriptHash())
1125 nSigOps += prevout.scriptPubKey.GetSigOpCount(vin[i].scriptSig);
1130 bool CTransaction::ConnectInputs(MapPrevTx inputs,
1131 map<uint256, CTxIndex>& mapTestPool, const CDiskTxPos& posThisTx,
1132 const CBlockIndex* pindexBlock, bool fBlock, bool fMiner, bool fStrictPayToScriptHash)
1134 // Take over previous transactions' spent pointers
1135 // fBlock is true when this is called from AcceptBlock when a new best-block is added to the blockchain
1136 // fMiner is true when called from the internal bitcoin miner
1137 // ... both are false when called from CTransaction::AcceptToMemoryPool
1142 for (unsigned int i = 0; i < vin.size(); i++)
1144 COutPoint prevout = vin[i].prevout;
1145 assert(inputs.count(prevout.hash) > 0);
1146 CTxIndex& txindex = inputs[prevout.hash].first;
1147 CTransaction& txPrev = inputs[prevout.hash].second;
1149 if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
1150 return DoS(100, 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()));
1152 // If prev is coinbase, check that it's matured
1153 if (txPrev.IsCoinBase())
1154 for (const CBlockIndex* pindex = pindexBlock; pindex && pindexBlock->nHeight - pindex->nHeight < COINBASE_MATURITY; pindex = pindex->pprev)
1155 if (pindex->nBlockPos == txindex.pos.nBlockPos && pindex->nFile == txindex.pos.nFile)
1156 return error("ConnectInputs() : tried to spend coinbase at depth %d", pindexBlock->nHeight - pindex->nHeight);
1158 // Check for conflicts (double-spend)
1159 // This doesn't trigger the DoS code on purpose; if it did, it would make it easier
1160 // for an attacker to attempt to split the network.
1161 if (!txindex.vSpent[prevout.n].IsNull())
1162 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());
1164 // Check for negative or overflow input values
1165 nValueIn += txPrev.vout[prevout.n].nValue;
1166 if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
1167 return DoS(100, error("ConnectInputs() : txin values out of range"));
1169 // Skip ECDSA signature verification when connecting blocks (fBlock=true)
1170 // before the last blockchain checkpoint. This is safe because block merkle hashes are
1171 // still computed and checked, and any change will be caught at the next checkpoint.
1172 if (!(fBlock && (nBestHeight < Checkpoints::GetTotalBlocksEstimate())))
1175 if (!VerifySignature(txPrev, *this, i, fStrictPayToScriptHash, 0))
1177 // only during transition phase for P2SH: do not invoke anti-DoS code for
1178 // potentially old clients relaying bad P2SH transactions
1179 if (fStrictPayToScriptHash && VerifySignature(txPrev, *this, i, false, 0))
1180 return error("ConnectInputs() : %s P2SH VerifySignature failed", GetHash().ToString().substr(0,10).c_str());
1182 return DoS(100,error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str()));
1186 // Mark outpoints as spent
1187 txindex.vSpent[prevout.n] = posThisTx;
1190 if (fBlock || fMiner)
1192 mapTestPool[prevout.hash] = txindex;
1196 if (nValueIn < GetValueOut())
1197 return DoS(100, error("ConnectInputs() : %s value in < value out", GetHash().ToString().substr(0,10).c_str()));
1199 // Tally transaction fees
1200 int64 nTxFee = nValueIn - GetValueOut();
1202 return DoS(100, error("ConnectInputs() : %s nTxFee < 0", GetHash().ToString().substr(0,10).c_str()));
1204 if (!MoneyRange(nFees))
1205 return DoS(100, error("ConnectInputs() : nFees out of range"));
1212 bool CTransaction::ClientConnectInputs()
1217 // Take over previous transactions' spent pointers
1221 for (unsigned int i = 0; i < vin.size(); i++)
1223 // Get prev tx from single transactions in memory
1224 COutPoint prevout = vin[i].prevout;
1225 if (!mempool.exists(prevout.hash))
1227 CTransaction& txPrev = mempool.lookup(prevout.hash);
1229 if (prevout.n >= txPrev.vout.size())
1233 if (!VerifySignature(txPrev, *this, i, true, 0))
1234 return error("ConnectInputs() : VerifySignature failed");
1236 ///// this is redundant with the mempool.mapNextTx stuff,
1237 ///// not sure which I want to get rid of
1238 ///// this has to go away now that posNext is gone
1239 // // Check for conflicts
1240 // if (!txPrev.vout[prevout.n].posNext.IsNull())
1241 // return error("ConnectInputs() : prev tx already used");
1243 // // Flag outpoints as used
1244 // txPrev.vout[prevout.n].posNext = posThisTx;
1246 nValueIn += txPrev.vout[prevout.n].nValue;
1248 if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
1249 return error("ClientConnectInputs() : txin values out of range");
1251 if (GetValueOut() > nValueIn)
1261 bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
1263 // Disconnect in reverse order
1264 for (int i = vtx.size()-1; i >= 0; i--)
1265 if (!vtx[i].DisconnectInputs(txdb))
1268 // Update block index on disk without changing it in memory.
1269 // The memory index structure will be changed after the db commits.
1272 CDiskBlockIndex blockindexPrev(pindex->pprev);
1273 blockindexPrev.hashNext = 0;
1274 if (!txdb.WriteBlockIndex(blockindexPrev))
1275 return error("DisconnectBlock() : WriteBlockIndex failed");
1281 bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
1283 // Check it again in case a previous version let a bad block in
1287 // Do not allow blocks that contain transactions which 'overwrite' older transactions,
1288 // unless those are already completely spent.
1289 // If such overwrites are allowed, coinbases and transactions depending upon those
1290 // can be duplicated to remove the ability to spend the first instance -- even after
1291 // being sent to another address.
1292 // See BIP30 and http://r6.ca/blog/20120206T005236Z.html for more information.
1293 // This logic is not necessary for memory pool transactions, as AcceptToMemoryPool
1294 // already refuses previously-known transaction id's entirely.
1295 // This rule applies to all blocks whose timestamp is after March 15, 2012, 0:00 UTC.
1296 // On testnet it is enabled as of februari 20, 2012, 0:00 UTC.
1297 if (pindex->nTime > 1331769600 || (fTestNet && pindex->nTime > 1329696000))
1299 BOOST_FOREACH(CTransaction& tx, vtx)
1301 CTxIndex txindexOld;
1302 if (txdb.ReadTxIndex(tx.GetHash(), txindexOld))
1304 BOOST_FOREACH(CDiskTxPos &pos, txindexOld.vSpent)
1311 // BIP16 didn't become active until Apr 1 2012 (Feb 15 on testnet)
1312 int64 nBIP16SwitchTime = fTestNet ? 1329264000 : 1333238400;
1313 bool fStrictPayToScriptHash = (pindex->nTime >= nBIP16SwitchTime);
1315 //// issue here: it doesn't know the version
1316 unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK, CLIENT_VERSION) - 1 + GetSizeOfCompactSize(vtx.size());
1318 map<uint256, CTxIndex> mapQueuedChanges;
1320 unsigned int nSigOps = 0;
1321 BOOST_FOREACH(CTransaction& tx, vtx)
1323 nSigOps += tx.GetLegacySigOpCount();
1324 if (nSigOps > MAX_BLOCK_SIGOPS)
1325 return DoS(100, error("ConnectBlock() : too many sigops"));
1327 CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
1328 nTxPos += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
1330 MapPrevTx mapInputs;
1331 if (!tx.IsCoinBase())
1334 if (!tx.FetchInputs(txdb, mapQueuedChanges, true, false, mapInputs, fInvalid))
1337 if (fStrictPayToScriptHash)
1339 // Add in sigops done by pay-to-script-hash inputs;
1340 // this is to prevent a "rogue miner" from creating
1341 // an incredibly-expensive-to-validate block.
1342 nSigOps += tx.GetP2SHSigOpCount(mapInputs);
1343 if (nSigOps > MAX_BLOCK_SIGOPS)
1344 return DoS(100, error("ConnectBlock() : too many sigops"));
1347 nFees += tx.GetValueIn(mapInputs)-tx.GetValueOut();
1349 if (!tx.ConnectInputs(mapInputs, mapQueuedChanges, posThisTx, pindex, true, false, fStrictPayToScriptHash))
1353 mapQueuedChanges[tx.GetHash()] = CTxIndex(posThisTx, tx.vout.size());
1356 // Write queued txindex changes
1357 for (map<uint256, CTxIndex>::iterator mi = mapQueuedChanges.begin(); mi != mapQueuedChanges.end(); ++mi)
1359 if (!txdb.UpdateTxIndex((*mi).first, (*mi).second))
1360 return error("ConnectBlock() : UpdateTxIndex failed");
1363 if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
1366 // Update block index on disk without changing it in memory.
1367 // The memory index structure will be changed after the db commits.
1370 CDiskBlockIndex blockindexPrev(pindex->pprev);
1371 blockindexPrev.hashNext = pindex->GetBlockHash();
1372 if (!txdb.WriteBlockIndex(blockindexPrev))
1373 return error("ConnectBlock() : WriteBlockIndex failed");
1376 // Watch for transactions paying to me
1377 BOOST_FOREACH(CTransaction& tx, vtx)
1378 SyncWithWallets(tx, this, true);
1383 bool static Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
1385 printf("REORGANIZE\n");
1388 CBlockIndex* pfork = pindexBest;
1389 CBlockIndex* plonger = pindexNew;
1390 while (pfork != plonger)
1392 while (plonger->nHeight > pfork->nHeight)
1393 if (!(plonger = plonger->pprev))
1394 return error("Reorganize() : plonger->pprev is null");
1395 if (pfork == plonger)
1397 if (!(pfork = pfork->pprev))
1398 return error("Reorganize() : pfork->pprev is null");
1401 // List of what to disconnect
1402 vector<CBlockIndex*> vDisconnect;
1403 for (CBlockIndex* pindex = pindexBest; pindex != pfork; pindex = pindex->pprev)
1404 vDisconnect.push_back(pindex);
1406 // List of what to connect
1407 vector<CBlockIndex*> vConnect;
1408 for (CBlockIndex* pindex = pindexNew; pindex != pfork; pindex = pindex->pprev)
1409 vConnect.push_back(pindex);
1410 reverse(vConnect.begin(), vConnect.end());
1412 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());
1413 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());
1415 // Disconnect shorter branch
1416 vector<CTransaction> vResurrect;
1417 BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
1420 if (!block.ReadFromDisk(pindex))
1421 return error("Reorganize() : ReadFromDisk for disconnect failed");
1422 if (!block.DisconnectBlock(txdb, pindex))
1423 return error("Reorganize() : DisconnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
1425 // Queue memory transactions to resurrect
1426 BOOST_FOREACH(const CTransaction& tx, block.vtx)
1427 if (!tx.IsCoinBase())
1428 vResurrect.push_back(tx);
1431 // Connect longer branch
1432 vector<CTransaction> vDelete;
1433 for (unsigned int i = 0; i < vConnect.size(); i++)
1435 CBlockIndex* pindex = vConnect[i];
1437 if (!block.ReadFromDisk(pindex))
1438 return error("Reorganize() : ReadFromDisk for connect failed");
1439 if (!block.ConnectBlock(txdb, pindex))
1443 return error("Reorganize() : ConnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
1446 // Queue memory transactions to delete
1447 BOOST_FOREACH(const CTransaction& tx, block.vtx)
1448 vDelete.push_back(tx);
1450 if (!txdb.WriteHashBestChain(pindexNew->GetBlockHash()))
1451 return error("Reorganize() : WriteHashBestChain failed");
1453 // Make sure it's successfully written to disk before changing memory structure
1454 if (!txdb.TxnCommit())
1455 return error("Reorganize() : TxnCommit failed");
1457 // Disconnect shorter branch
1458 BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
1460 pindex->pprev->pnext = NULL;
1462 // Connect longer branch
1463 BOOST_FOREACH(CBlockIndex* pindex, vConnect)
1465 pindex->pprev->pnext = pindex;
1467 // Resurrect memory transactions that were in the disconnected branch
1468 BOOST_FOREACH(CTransaction& tx, vResurrect)
1469 tx.AcceptToMemoryPool(txdb, false);
1471 // Delete redundant memory transactions that are in the connected branch
1472 BOOST_FOREACH(CTransaction& tx, vDelete)
1475 printf("REORGANIZE: done\n");
1482 runCommand(std::string strCommand)
1484 int nErr = ::system(strCommand.c_str());
1486 printf("runCommand error: system(%s) returned %d\n", strCommand.c_str(), nErr);
1489 // Called from inside SetBestChain: attaches a block to the new best chain being built
1490 bool CBlock::SetBestChainInner(CTxDB& txdb, CBlockIndex *pindexNew)
1492 uint256 hash = GetHash();
1494 // Adding to current best branch
1495 if (!ConnectBlock(txdb, pindexNew) || !txdb.WriteHashBestChain(hash))
1498 InvalidChainFound(pindexNew);
1501 if (!txdb.TxnCommit())
1502 return error("SetBestChain() : TxnCommit failed");
1504 // Add to current best branch
1505 pindexNew->pprev->pnext = pindexNew;
1507 // Delete redundant memory transactions
1508 BOOST_FOREACH(CTransaction& tx, vtx)
1514 bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
1516 uint256 hash = GetHash();
1518 if (!txdb.TxnBegin())
1519 return error("SetBestChain() : TxnBegin failed");
1521 if (pindexGenesisBlock == NULL && hash == hashGenesisBlock)
1523 txdb.WriteHashBestChain(hash);
1524 if (!txdb.TxnCommit())
1525 return error("SetBestChain() : TxnCommit failed");
1526 pindexGenesisBlock = pindexNew;
1528 else if (hashPrevBlock == hashBestChain)
1530 if (!SetBestChainInner(txdb, pindexNew))
1531 return error("SetBestChain() : SetBestChainInner failed");
1535 // the first block in the new chain that will cause it to become the new best chain
1536 CBlockIndex *pindexIntermediate = pindexNew;
1538 // list of blocks that need to be connected afterwards
1539 std::vector<CBlockIndex*> vpindexSecondary;
1541 // Reorganize is costly in terms of db load, as it works in a single db transaction.
1542 // Try to limit how much needs to be done inside
1543 while (pindexIntermediate->pprev && pindexIntermediate->pprev->bnChainWork > pindexBest->bnChainWork)
1545 vpindexSecondary.push_back(pindexIntermediate);
1546 pindexIntermediate = pindexIntermediate->pprev;
1549 if (!vpindexSecondary.empty())
1550 printf("Postponing %i reconnects\n", vpindexSecondary.size());
1552 // Switch to new best branch
1553 if (!Reorganize(txdb, pindexIntermediate))
1556 InvalidChainFound(pindexNew);
1557 return error("SetBestChain() : Reorganize failed");
1560 // Connect futher blocks
1561 BOOST_REVERSE_FOREACH(CBlockIndex *pindex, vpindexSecondary)
1564 if (!block.ReadFromDisk(pindex))
1566 printf("SetBestChain() : ReadFromDisk failed\n");
1569 if (!txdb.TxnBegin()) {
1570 printf("SetBestChain() : TxnBegin 2 failed\n");
1573 // errors now are not fatal, we still did a reorganisation to a new chain in a valid way
1574 if (!block.SetBestChainInner(txdb, pindex))
1579 // Update best block in wallet (so we can detect restored wallets)
1580 bool fIsInitialDownload = IsInitialBlockDownload();
1581 if (!fIsInitialDownload)
1583 const CBlockLocator locator(pindexNew);
1584 ::SetBestChain(locator);
1588 hashBestChain = hash;
1589 pindexBest = pindexNew;
1590 nBestHeight = pindexBest->nHeight;
1591 bnBestChainWork = pindexNew->bnChainWork;
1592 nTimeBestReceived = GetTime();
1593 nTransactionsUpdated++;
1594 printf("SetBestChain: new best=%s height=%d work=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainWork.ToString().c_str());
1596 std::string strCmd = GetArg("-blocknotify", "");
1598 if (!fIsInitialDownload && !strCmd.empty())
1600 boost::replace_all(strCmd, "%s", hashBestChain.GetHex());
1601 boost::thread t(runCommand, strCmd); // thread runs free
1608 bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
1610 // Check for duplicate
1611 uint256 hash = GetHash();
1612 if (mapBlockIndex.count(hash))
1613 return error("AddToBlockIndex() : %s already exists", hash.ToString().substr(0,20).c_str());
1615 // Construct new block index object
1616 CBlockIndex* pindexNew = new CBlockIndex(nFile, nBlockPos, *this);
1618 return error("AddToBlockIndex() : new CBlockIndex failed");
1619 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
1620 pindexNew->phashBlock = &((*mi).first);
1621 map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(hashPrevBlock);
1622 if (miPrev != mapBlockIndex.end())
1624 pindexNew->pprev = (*miPrev).second;
1625 pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
1627 pindexNew->bnChainWork = (pindexNew->pprev ? pindexNew->pprev->bnChainWork : 0) + pindexNew->GetBlockWork();
1630 if (!txdb.TxnBegin())
1632 txdb.WriteBlockIndex(CDiskBlockIndex(pindexNew));
1633 if (!txdb.TxnCommit())
1637 if (pindexNew->bnChainWork > bnBestChainWork)
1638 if (!SetBestChain(txdb, pindexNew))
1643 if (pindexNew == pindexBest)
1645 // Notify UI to display prev block's coinbase if it was ours
1646 static uint256 hashPrevBestCoinBase;
1647 UpdatedTransaction(hashPrevBestCoinBase);
1648 hashPrevBestCoinBase = vtx[0].GetHash();
1651 uiInterface.NotifyBlocksChanged();
1658 bool CBlock::CheckBlock() const
1660 // These are checks that are independent of context
1661 // that can be verified before saving an orphan block.
1664 if (vtx.empty() || vtx.size() > MAX_BLOCK_SIZE || ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
1665 return DoS(100, error("CheckBlock() : size limits failed"));
1667 // Check proof of work matches claimed amount
1668 if (!CheckProofOfWork(GetHash(), nBits))
1669 return DoS(50, error("CheckBlock() : proof of work failed"));
1672 if (GetBlockTime() > GetAdjustedTime() + 2 * 60 * 60)
1673 return error("CheckBlock() : block timestamp too far in the future");
1675 // First transaction must be coinbase, the rest must not be
1676 if (vtx.empty() || !vtx[0].IsCoinBase())
1677 return DoS(100, error("CheckBlock() : first tx is not coinbase"));
1678 for (unsigned int i = 1; i < vtx.size(); i++)
1679 if (vtx[i].IsCoinBase())
1680 return DoS(100, error("CheckBlock() : more than one coinbase"));
1682 // Check transactions
1683 BOOST_FOREACH(const CTransaction& tx, vtx)
1684 if (!tx.CheckTransaction())
1685 return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed"));
1687 // Check for duplicate txids. This is caught by ConnectInputs(),
1688 // but catching it earlier avoids a potential DoS attack:
1689 set<uint256> uniqueTx;
1690 BOOST_FOREACH(const CTransaction& tx, vtx)
1692 uniqueTx.insert(tx.GetHash());
1694 if (uniqueTx.size() != vtx.size())
1695 return DoS(100, error("CheckBlock() : duplicate transaction"));
1697 unsigned int nSigOps = 0;
1698 BOOST_FOREACH(const CTransaction& tx, vtx)
1700 nSigOps += tx.GetLegacySigOpCount();
1702 if (nSigOps > MAX_BLOCK_SIGOPS)
1703 return DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"));
1706 if (hashMerkleRoot != BuildMerkleTree())
1707 return DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
1712 bool CBlock::AcceptBlock()
1714 // Check for duplicate
1715 uint256 hash = GetHash();
1716 if (mapBlockIndex.count(hash))
1717 return error("AcceptBlock() : block already in mapBlockIndex");
1719 // Get prev block index
1720 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
1721 if (mi == mapBlockIndex.end())
1722 return DoS(10, error("AcceptBlock() : prev block not found"));
1723 CBlockIndex* pindexPrev = (*mi).second;
1724 int nHeight = pindexPrev->nHeight+1;
1726 // Check proof of work
1727 if (nBits != GetNextWorkRequired(pindexPrev, this))
1728 return DoS(100, error("AcceptBlock() : incorrect proof of work"));
1730 // Check timestamp against prev
1731 if (GetBlockTime() <= pindexPrev->GetMedianTimePast())
1732 return error("AcceptBlock() : block's timestamp is too early");
1734 // Check that all transactions are finalized
1735 BOOST_FOREACH(const CTransaction& tx, vtx)
1736 if (!tx.IsFinal(nHeight, GetBlockTime()))
1737 return DoS(10, error("AcceptBlock() : contains a non-final transaction"));
1739 // Check that the block chain matches the known block chain up to a checkpoint
1740 if (!Checkpoints::CheckBlock(nHeight, hash))
1741 return DoS(100, error("AcceptBlock() : rejected by checkpoint lockin at %d", nHeight));
1743 // Write block to history file
1744 if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK, CLIENT_VERSION)))
1745 return error("AcceptBlock() : out of disk space");
1746 unsigned int nFile = -1;
1747 unsigned int nBlockPos = 0;
1748 if (!WriteToDisk(nFile, nBlockPos))
1749 return error("AcceptBlock() : WriteToDisk failed");
1750 if (!AddToBlockIndex(nFile, nBlockPos))
1751 return error("AcceptBlock() : AddToBlockIndex failed");
1753 // Relay inventory, but don't relay old inventory during initial block download
1754 int nBlockEstimate = Checkpoints::GetTotalBlocksEstimate();
1755 if (hashBestChain == hash)
1758 BOOST_FOREACH(CNode* pnode, vNodes)
1759 if (nBestHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : nBlockEstimate))
1760 pnode->PushInventory(CInv(MSG_BLOCK, hash));
1766 bool ProcessBlock(CNode* pfrom, CBlock* pblock)
1768 // Check for duplicate
1769 uint256 hash = pblock->GetHash();
1770 if (mapBlockIndex.count(hash))
1771 return error("ProcessBlock() : already have block %d %s", mapBlockIndex[hash]->nHeight, hash.ToString().substr(0,20).c_str());
1772 if (mapOrphanBlocks.count(hash))
1773 return error("ProcessBlock() : already have block (orphan) %s", hash.ToString().substr(0,20).c_str());
1775 // Preliminary checks
1776 if (!pblock->CheckBlock())
1777 return error("ProcessBlock() : CheckBlock FAILED");
1779 CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(mapBlockIndex);
1780 if (pcheckpoint && pblock->hashPrevBlock != hashBestChain)
1782 // Extra checks to prevent "fill up memory by spamming with bogus blocks"
1783 int64 deltaTime = pblock->GetBlockTime() - pcheckpoint->nTime;
1787 pfrom->Misbehaving(100);
1788 return error("ProcessBlock() : block with timestamp before last checkpoint");
1791 bnNewBlock.SetCompact(pblock->nBits);
1793 bnRequired.SetCompact(ComputeMinWork(pcheckpoint->nBits, deltaTime));
1794 if (bnNewBlock > bnRequired)
1797 pfrom->Misbehaving(100);
1798 return error("ProcessBlock() : block with too little proof-of-work");
1803 // If don't already have its previous block, shunt it off to holding area until we get it
1804 if (!mapBlockIndex.count(pblock->hashPrevBlock))
1806 printf("ProcessBlock: ORPHAN BLOCK, prev=%s\n", pblock->hashPrevBlock.ToString().substr(0,20).c_str());
1807 CBlock* pblock2 = new CBlock(*pblock);
1808 mapOrphanBlocks.insert(make_pair(hash, pblock2));
1809 mapOrphanBlocksByPrev.insert(make_pair(pblock2->hashPrevBlock, pblock2));
1811 // Ask this guy to fill in what we're missing
1813 pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(pblock2));
1818 if (!pblock->AcceptBlock())
1819 return error("ProcessBlock() : AcceptBlock FAILED");
1821 // Recursively process any orphan blocks that depended on this one
1822 vector<uint256> vWorkQueue;
1823 vWorkQueue.push_back(hash);
1824 for (unsigned int i = 0; i < vWorkQueue.size(); i++)
1826 uint256 hashPrev = vWorkQueue[i];
1827 for (multimap<uint256, CBlock*>::iterator mi = mapOrphanBlocksByPrev.lower_bound(hashPrev);
1828 mi != mapOrphanBlocksByPrev.upper_bound(hashPrev);
1831 CBlock* pblockOrphan = (*mi).second;
1832 if (pblockOrphan->AcceptBlock())
1833 vWorkQueue.push_back(pblockOrphan->GetHash());
1834 mapOrphanBlocks.erase(pblockOrphan->GetHash());
1835 delete pblockOrphan;
1837 mapOrphanBlocksByPrev.erase(hashPrev);
1840 printf("ProcessBlock: ACCEPTED\n");
1851 bool CheckDiskSpace(uint64 nAdditionalBytes)
1853 uint64 nFreeBytesAvailable = filesystem::space(GetDataDir()).available;
1855 // Check for nMinDiskSpace bytes (currently 50MB)
1856 if (nFreeBytesAvailable < nMinDiskSpace + nAdditionalBytes)
1859 string strMessage = _("Warning: Disk space is low");
1860 strMiscWarning = strMessage;
1861 printf("*** %s\n", strMessage.c_str());
1862 uiInterface.ThreadSafeMessageBox(strMessage, "Bitcoin", CClientUIInterface::OK | CClientUIInterface::ICON_EXCLAMATION | CClientUIInterface::MODAL);
1863 uiInterface.QueueShutdown();
1869 FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode)
1871 if ((nFile < 1) || (nFile == (unsigned int) -1))
1873 FILE* file = fopen((GetDataDir() / strprintf("blk%04d.dat", nFile)).string().c_str(), pszMode);
1876 if (nBlockPos != 0 && !strchr(pszMode, 'a') && !strchr(pszMode, 'w'))
1878 if (fseek(file, nBlockPos, SEEK_SET) != 0)
1887 static unsigned int nCurrentBlockFile = 1;
1889 FILE* AppendBlockFile(unsigned int& nFileRet)
1894 FILE* file = OpenBlockFile(nCurrentBlockFile, 0, "ab");
1897 if (fseek(file, 0, SEEK_END) != 0)
1899 // FAT32 filesize max 4GB, fseek and ftell max 2GB, so we must stay under 2GB
1900 if (ftell(file) < 0x7F000000 - MAX_SIZE)
1902 nFileRet = nCurrentBlockFile;
1906 nCurrentBlockFile++;
1910 bool LoadBlockIndex(bool fAllowNew)
1914 hashGenesisBlock = uint256("0x00000007199508e34a9ff81e6ec0c477a4cccff2a4767a8eee39c11db367b008");
1915 bnProofOfWorkLimit = CBigNum(~uint256(0) >> 28);
1916 pchMessageStart[0] = 0xfa;
1917 pchMessageStart[1] = 0xbf;
1918 pchMessageStart[2] = 0xb5;
1919 pchMessageStart[3] = 0xda;
1926 if (!txdb.LoadBlockIndex())
1931 // Init with genesis block
1933 if (mapBlockIndex.empty())
1939 // CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
1940 // CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
1941 // CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
1942 // CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
1943 // vMerkleTree: 4a5e1e
1946 const char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
1948 txNew.vin.resize(1);
1949 txNew.vout.resize(1);
1950 txNew.vin[0].scriptSig = CScript() << 486604799 << CBigNum(4) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
1951 txNew.vout[0].nValue = 50 * COIN;
1952 txNew.vout[0].scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
1954 block.vtx.push_back(txNew);
1955 block.hashPrevBlock = 0;
1956 block.hashMerkleRoot = block.BuildMerkleTree();
1958 block.nTime = 1231006505;
1959 block.nBits = 0x1d00ffff;
1960 block.nNonce = 2083236893;
1964 block.nTime = 1296688602;
1965 block.nBits = 0x1d07fff8;
1966 block.nNonce = 384568319;
1970 printf("%s\n", block.GetHash().ToString().c_str());
1971 printf("%s\n", hashGenesisBlock.ToString().c_str());
1972 printf("%s\n", block.hashMerkleRoot.ToString().c_str());
1973 assert(block.hashMerkleRoot == uint256("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
1975 assert(block.GetHash() == hashGenesisBlock);
1977 // Start new block file
1979 unsigned int nBlockPos;
1980 if (!block.WriteToDisk(nFile, nBlockPos))
1981 return error("LoadBlockIndex() : writing genesis block to disk failed");
1982 if (!block.AddToBlockIndex(nFile, nBlockPos))
1983 return error("LoadBlockIndex() : genesis block not accepted");
1991 void PrintBlockTree()
1993 // precompute tree structure
1994 map<CBlockIndex*, vector<CBlockIndex*> > mapNext;
1995 for (map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
1997 CBlockIndex* pindex = (*mi).second;
1998 mapNext[pindex->pprev].push_back(pindex);
2000 //while (rand() % 3 == 0)
2001 // mapNext[pindex->pprev].push_back(pindex);
2004 vector<pair<int, CBlockIndex*> > vStack;
2005 vStack.push_back(make_pair(0, pindexGenesisBlock));
2008 while (!vStack.empty())
2010 int nCol = vStack.back().first;
2011 CBlockIndex* pindex = vStack.back().second;
2014 // print split or gap
2015 if (nCol > nPrevCol)
2017 for (int i = 0; i < nCol-1; i++)
2021 else if (nCol < nPrevCol)
2023 for (int i = 0; i < nCol; i++)
2030 for (int i = 0; i < nCol; i++)
2035 block.ReadFromDisk(pindex);
2036 printf("%d (%u,%u) %s %s tx %d",
2040 block.GetHash().ToString().substr(0,20).c_str(),
2041 DateTimeStrFormat("%x %H:%M:%S", block.GetBlockTime()).c_str(),
2044 PrintWallets(block);
2046 // put the main timechain first
2047 vector<CBlockIndex*>& vNext = mapNext[pindex];
2048 for (unsigned int i = 0; i < vNext.size(); i++)
2050 if (vNext[i]->pnext)
2052 swap(vNext[0], vNext[i]);
2058 for (unsigned int i = 0; i < vNext.size(); i++)
2059 vStack.push_back(make_pair(nCol+i, vNext[i]));
2063 bool LoadExternalBlockFile(FILE* fileIn)
2069 CAutoFile blkdat(fileIn, SER_DISK, CLIENT_VERSION);
2070 unsigned int nPos = 0;
2071 while (nPos != (unsigned int)-1 && blkdat.good() && !fRequestShutdown)
2073 unsigned char pchData[65536];
2075 fseek(blkdat, nPos, SEEK_SET);
2076 int nRead = fread(pchData, 1, sizeof(pchData), blkdat);
2079 nPos = (unsigned int)-1;
2082 void* nFind = memchr(pchData, pchMessageStart[0], nRead+1-sizeof(pchMessageStart));
2085 if (memcmp(nFind, pchMessageStart, sizeof(pchMessageStart))==0)
2087 nPos += ((unsigned char*)nFind - pchData) + sizeof(pchMessageStart);
2090 nPos += ((unsigned char*)nFind - pchData) + 1;
2093 nPos += sizeof(pchData) - sizeof(pchMessageStart) + 1;
2094 } while(!fRequestShutdown);
2095 if (nPos == (unsigned int)-1)
2097 fseek(blkdat, nPos, SEEK_SET);
2100 if (nSize > 0 && nSize <= MAX_BLOCK_SIZE)
2104 if (ProcessBlock(NULL,&block))
2112 catch (std::exception &e)
2116 printf("Loaded %i blocks from external file\n", nLoaded);
2128 //////////////////////////////////////////////////////////////////////////////
2133 map<uint256, CAlert> mapAlerts;
2134 CCriticalSection cs_mapAlerts;
2136 string GetWarnings(string strFor)
2139 string strStatusBar;
2141 if (GetBoolArg("-testsafemode"))
2144 // Misc warnings like out of disk space and clock is wrong
2145 if (strMiscWarning != "")
2148 strStatusBar = strMiscWarning;
2151 // Longer invalid proof-of-work chain
2152 if (pindexBest && bnBestInvalidWork > bnBestChainWork + pindexBest->GetBlockWork() * 6)
2155 strStatusBar = strRPC = "WARNING: Displayed transactions may not be correct! You may need to upgrade, or other nodes may need to upgrade.";
2161 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
2163 const CAlert& alert = item.second;
2164 if (alert.AppliesToMe() && alert.nPriority > nPriority)
2166 nPriority = alert.nPriority;
2167 strStatusBar = alert.strStatusBar;
2172 if (strFor == "statusbar")
2173 return strStatusBar;
2174 else if (strFor == "rpc")
2176 assert(!"GetWarnings() : invalid parameter");
2180 CAlert CAlert::getAlertByHash(const uint256 &hash)
2185 map<uint256, CAlert>::iterator mi = mapAlerts.find(hash);
2186 if(mi != mapAlerts.end())
2187 retval = mi->second;
2192 bool CAlert::ProcessAlert()
2194 if (!CheckSignature())
2201 // Cancel previous alerts
2202 for (map<uint256, CAlert>::iterator mi = mapAlerts.begin(); mi != mapAlerts.end();)
2204 const CAlert& alert = (*mi).second;
2207 printf("cancelling alert %d\n", alert.nID);
2208 uiInterface.NotifyAlertChanged((*mi).first, CT_DELETED);
2209 mapAlerts.erase(mi++);
2211 else if (!alert.IsInEffect())
2213 printf("expiring alert %d\n", alert.nID);
2214 uiInterface.NotifyAlertChanged((*mi).first, CT_DELETED);
2215 mapAlerts.erase(mi++);
2221 // Check if this alert has been cancelled
2222 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
2224 const CAlert& alert = item.second;
2225 if (alert.Cancels(*this))
2227 printf("alert already cancelled by %d\n", alert.nID);
2233 mapAlerts.insert(make_pair(GetHash(), *this));
2234 // Notify UI if it applies to me
2236 uiInterface.NotifyAlertChanged(GetHash(), CT_NEW);
2239 printf("accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe());
2250 //////////////////////////////////////////////////////////////////////////////
2256 bool static AlreadyHave(CTxDB& txdb, const CInv& inv)
2262 bool txInMap = false;
2265 txInMap = (mempool.exists(inv.hash));
2268 mapOrphanTransactions.count(inv.hash) ||
2269 txdb.ContainsTx(inv.hash);
2273 return mapBlockIndex.count(inv.hash) ||
2274 mapOrphanBlocks.count(inv.hash);
2276 // Don't know what it is, just say we already got one
2283 // The message start string is designed to be unlikely to occur in normal data.
2284 // The characters are rarely used upper ascii, not valid as UTF-8, and produce
2285 // a large 4-byte int at any alignment.
2286 unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
2289 bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
2291 static map<CService, vector<unsigned char> > mapReuseKey;
2292 RandAddSeedPerfmon();
2294 printf("received: %s (%d bytes)\n", strCommand.c_str(), vRecv.size());
2295 if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
2297 printf("dropmessagestest DROPPING RECV MESSAGE\n");
2305 if (strCommand == "version")
2307 // Each connection can only send one version message
2308 if (pfrom->nVersion != 0)
2310 pfrom->Misbehaving(1);
2318 vRecv >> pfrom->nVersion >> pfrom->nServices >> nTime >> addrMe;
2319 if (pfrom->nVersion < MIN_PROTO_VERSION)
2321 // Since February 20, 2012, the protocol is initiated at version 209,
2322 // and earlier versions are no longer supported
2323 printf("partner %s using obsolete version %i; disconnecting\n", pfrom->addr.ToString().c_str(), pfrom->nVersion);
2324 pfrom->fDisconnect = true;
2328 if (pfrom->nVersion == 10300)
2329 pfrom->nVersion = 300;
2331 vRecv >> addrFrom >> nNonce;
2333 vRecv >> pfrom->strSubVer;
2335 vRecv >> pfrom->nStartingHeight;
2337 if (pfrom->fInbound && addrMe.IsRoutable())
2339 pfrom->addrLocal = addrMe;
2343 // Disconnect if we connected to ourself
2344 if (nNonce == nLocalHostNonce && nNonce > 1)
2346 printf("connected to self at %s, disconnecting\n", pfrom->addr.ToString().c_str());
2347 pfrom->fDisconnect = true;
2351 // Be shy and don't send version until we hear
2352 if (pfrom->fInbound)
2353 pfrom->PushVersion();
2355 pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
2357 AddTimeData(pfrom->addr, nTime);
2360 pfrom->PushMessage("verack");
2361 pfrom->vSend.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
2363 if (!pfrom->fInbound)
2365 // Advertise our address
2366 if (!fNoListen && !fUseProxy && !IsInitialBlockDownload())
2368 CAddress addr = GetLocalAddress(&pfrom->addr);
2369 if (addr.IsRoutable())
2370 pfrom->PushAddress(addr);
2373 // Get recent addresses
2374 if (pfrom->fOneShot || pfrom->nVersion >= CADDR_TIME_VERSION || addrman.size() < 1000)
2376 pfrom->PushMessage("getaddr");
2377 pfrom->fGetAddr = true;
2379 addrman.Good(pfrom->addr);
2381 if (((CNetAddr)pfrom->addr) == (CNetAddr)addrFrom)
2383 addrman.Add(addrFrom, addrFrom);
2384 addrman.Good(addrFrom);
2388 // Ask the first connected node for block updates
2389 static int nAskedForBlocks = 0;
2390 if (!pfrom->fClient && !pfrom->fOneShot &&
2391 (pfrom->nVersion < NOBLKS_VERSION_START ||
2392 pfrom->nVersion >= NOBLKS_VERSION_END) &&
2393 (nAskedForBlocks < 1 || vNodes.size() <= 1))
2396 pfrom->PushGetBlocks(pindexBest, uint256(0));
2402 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
2403 item.second.RelayTo(pfrom);
2406 pfrom->fSuccessfullyConnected = true;
2408 printf("version message: version %d, blocks=%d\n", pfrom->nVersion, pfrom->nStartingHeight);
2410 cPeerBlockCounts.input(pfrom->nStartingHeight);
2414 else if (pfrom->nVersion == 0)
2416 // Must have a version message before anything else
2417 pfrom->Misbehaving(1);
2422 else if (strCommand == "verack")
2424 pfrom->vRecv.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
2428 else if (strCommand == "addr")
2430 vector<CAddress> vAddr;
2433 // Don't want addr from older versions unless seeding
2434 if (pfrom->nVersion < CADDR_TIME_VERSION && addrman.size() > 1000)
2436 if (vAddr.size() > 1000)
2438 pfrom->Misbehaving(20);
2439 return error("message addr size() = %d", vAddr.size());
2442 // Store the new addresses
2443 vector<CAddress> vAddrOk;
2444 int64 nNow = GetAdjustedTime();
2445 int64 nSince = nNow - 10 * 60;
2446 BOOST_FOREACH(CAddress& addr, vAddr)
2450 if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
2451 addr.nTime = nNow - 5 * 24 * 60 * 60;
2452 pfrom->AddAddressKnown(addr);
2453 bool fReachable = IsReachable(addr);
2454 if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
2456 // Relay to a limited number of other nodes
2459 // Use deterministic randomness to send to the same nodes for 24 hours
2460 // at a time so the setAddrKnowns of the chosen nodes prevent repeats
2461 static uint256 hashSalt;
2463 RAND_bytes((unsigned char*)&hashSalt, sizeof(hashSalt));
2464 int64 hashAddr = addr.GetHash();
2465 uint256 hashRand = hashSalt ^ (hashAddr<<32) ^ ((GetTime()+hashAddr)/(24*60*60));
2466 hashRand = Hash(BEGIN(hashRand), END(hashRand));
2467 multimap<uint256, CNode*> mapMix;
2468 BOOST_FOREACH(CNode* pnode, vNodes)
2470 if (pnode->nVersion < CADDR_TIME_VERSION)
2472 unsigned int nPointer;
2473 memcpy(&nPointer, &pnode, sizeof(nPointer));
2474 uint256 hashKey = hashRand ^ nPointer;
2475 hashKey = Hash(BEGIN(hashKey), END(hashKey));
2476 mapMix.insert(make_pair(hashKey, pnode));
2478 int nRelayNodes = fReachable ? 2 : 1; // limited relaying of addresses outside our network(s)
2479 for (multimap<uint256, CNode*>::iterator mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
2480 ((*mi).second)->PushAddress(addr);
2483 // Do not store addresses outside our network
2485 vAddrOk.push_back(addr);
2487 addrman.Add(vAddrOk, pfrom->addr, 2 * 60 * 60);
2488 if (vAddr.size() < 1000)
2489 pfrom->fGetAddr = false;
2490 if (pfrom->fOneShot)
2491 pfrom->fDisconnect = true;
2495 else if (strCommand == "inv")
2499 if (vInv.size() > 50000)
2501 pfrom->Misbehaving(20);
2502 return error("message inv size() = %d", vInv.size());
2505 // find last block in inv vector
2506 unsigned int nLastBlock = (unsigned int)(-1);
2507 for (unsigned int nInv = 0; nInv < vInv.size(); nInv++) {
2508 if (vInv[vInv.size() - 1 - nInv].type == MSG_BLOCK) {
2509 nLastBlock = vInv.size() - 1 - nInv;
2514 for (unsigned int nInv = 0; nInv < vInv.size(); nInv++)
2516 const CInv &inv = vInv[nInv];
2520 pfrom->AddInventoryKnown(inv);
2522 bool fAlreadyHave = AlreadyHave(txdb, inv);
2524 printf(" got inventory: %s %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new");
2528 else if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash)) {
2529 pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(mapOrphanBlocks[inv.hash]));
2530 } else if (nInv == nLastBlock) {
2531 // In case we are on a very long side-chain, it is possible that we already have
2532 // the last block in an inv bundle sent in response to getblocks. Try to detect
2533 // this situation and push another getblocks to continue.
2534 std::vector<CInv> vGetData(1,inv);
2535 pfrom->PushGetBlocks(mapBlockIndex[inv.hash], uint256(0));
2537 printf("force request: %s\n", inv.ToString().c_str());
2540 // Track requests for our stuff
2541 Inventory(inv.hash);
2546 else if (strCommand == "getdata")
2550 if (vInv.size() > 50000)
2552 pfrom->Misbehaving(20);
2553 return error("message getdata size() = %d", vInv.size());
2556 BOOST_FOREACH(const CInv& inv, vInv)
2560 printf("received getdata for: %s\n", inv.ToString().c_str());
2562 if (inv.type == MSG_BLOCK)
2564 // Send block from disk
2565 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(inv.hash);
2566 if (mi != mapBlockIndex.end())
2569 block.ReadFromDisk((*mi).second);
2570 pfrom->PushMessage("block", block);
2572 // Trigger them to send a getblocks request for the next batch of inventory
2573 if (inv.hash == pfrom->hashContinue)
2575 // Bypass PushInventory, this must send even if redundant,
2576 // and we want it right after the last block so they don't
2577 // wait for other stuff first.
2579 vInv.push_back(CInv(MSG_BLOCK, hashBestChain));
2580 pfrom->PushMessage("inv", vInv);
2581 pfrom->hashContinue = 0;
2585 else if (inv.IsKnownType())
2587 // Send stream from relay memory
2590 map<CInv, CDataStream>::iterator mi = mapRelay.find(inv);
2591 if (mi != mapRelay.end())
2592 pfrom->PushMessage(inv.GetCommand(), (*mi).second);
2596 // Track requests for our stuff
2597 Inventory(inv.hash);
2602 else if (strCommand == "getblocks")
2604 CBlockLocator locator;
2606 vRecv >> locator >> hashStop;
2608 // Find the last block the caller has in the main chain
2609 CBlockIndex* pindex = locator.GetBlockIndex();
2611 // Send the rest of the chain
2613 pindex = pindex->pnext;
2614 int nLimit = 500 + locator.GetDistanceBack();
2615 unsigned int nBytes = 0;
2616 printf("getblocks %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
2617 for (; pindex; pindex = pindex->pnext)
2619 if (pindex->GetBlockHash() == hashStop)
2621 printf(" getblocks stopping at %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
2624 pfrom->PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash()));
2626 block.ReadFromDisk(pindex, true);
2627 nBytes += block.GetSerializeSize(SER_NETWORK, PROTOCOL_VERSION);
2628 if (--nLimit <= 0 || nBytes >= SendBufferSize()/2)
2630 // When this block is requested, we'll send an inv that'll make them
2631 // getblocks the next batch of inventory.
2632 printf(" getblocks stopping at limit %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
2633 pfrom->hashContinue = pindex->GetBlockHash();
2640 else if (strCommand == "getheaders")
2642 CBlockLocator locator;
2644 vRecv >> locator >> hashStop;
2646 CBlockIndex* pindex = NULL;
2647 if (locator.IsNull())
2649 // If locator is null, return the hashStop block
2650 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashStop);
2651 if (mi == mapBlockIndex.end())
2653 pindex = (*mi).second;
2657 // Find the last block the caller has in the main chain
2658 pindex = locator.GetBlockIndex();
2660 pindex = pindex->pnext;
2663 vector<CBlock> vHeaders;
2665 printf("getheaders %d to %s\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str());
2666 for (; pindex; pindex = pindex->pnext)
2668 vHeaders.push_back(pindex->GetBlockHeader());
2669 if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
2672 pfrom->PushMessage("headers", vHeaders);
2676 else if (strCommand == "tx")
2678 vector<uint256> vWorkQueue;
2679 CDataStream vMsg(vRecv);
2684 CInv inv(MSG_TX, tx.GetHash());
2685 pfrom->AddInventoryKnown(inv);
2687 bool fMissingInputs = false;
2688 if (tx.AcceptToMemoryPool(txdb, true, &fMissingInputs))
2690 SyncWithWallets(tx, NULL, true);
2691 RelayMessage(inv, vMsg);
2692 mapAlreadyAskedFor.erase(inv);
2693 vWorkQueue.push_back(inv.hash);
2695 // Recursively process any orphan transactions that depended on this one
2696 for (unsigned int i = 0; i < vWorkQueue.size(); i++)
2698 uint256 hashPrev = vWorkQueue[i];
2699 for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(hashPrev);
2700 mi != mapOrphanTransactionsByPrev.upper_bound(hashPrev);
2703 const CDataStream& vMsg = *((*mi).second);
2705 CDataStream(vMsg) >> tx;
2706 CInv inv(MSG_TX, tx.GetHash());
2708 if (tx.AcceptToMemoryPool(txdb, true))
2710 printf(" accepted orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
2711 SyncWithWallets(tx, NULL, true);
2712 RelayMessage(inv, vMsg);
2713 mapAlreadyAskedFor.erase(inv);
2714 vWorkQueue.push_back(inv.hash);
2719 BOOST_FOREACH(uint256 hash, vWorkQueue)
2720 EraseOrphanTx(hash);
2722 else if (fMissingInputs)
2724 printf("storing orphan tx %s (mapsz %d)\n",
2725 inv.hash.ToString().substr(0,10).c_str(),
2726 mapOrphanTransactions.size() + 1);
2729 // DoS prevention: do not allow mapOrphanTransactions to grow unbounded
2730 unsigned int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
2732 printf("mapOrphan overflow, removed %u tx\n", nEvicted);
2734 if (tx.nDoS) pfrom->Misbehaving(tx.nDoS);
2738 else if (strCommand == "block")
2743 printf("received block %s\n", block.GetHash().ToString().substr(0,20).c_str());
2746 CInv inv(MSG_BLOCK, block.GetHash());
2747 pfrom->AddInventoryKnown(inv);
2749 if (ProcessBlock(pfrom, &block))
2750 mapAlreadyAskedFor.erase(inv);
2751 if (block.nDoS) pfrom->Misbehaving(block.nDoS);
2755 else if (strCommand == "getaddr")
2757 pfrom->vAddrToSend.clear();
2758 vector<CAddress> vAddr = addrman.GetAddr();
2759 BOOST_FOREACH(const CAddress &addr, vAddr)
2760 pfrom->PushAddress(addr);
2764 else if (strCommand == "checkorder")
2769 if (!GetBoolArg("-allowreceivebyip"))
2771 pfrom->PushMessage("reply", hashReply, (int)2, string(""));
2778 /// we have a chance to check the order here
2780 // Keep giving the same key to the same ip until they use it
2781 if (!mapReuseKey.count(pfrom->addr))
2782 pwalletMain->GetKeyFromPool(mapReuseKey[pfrom->addr], true);
2784 // Send back approval of order and pubkey to use
2785 CScript scriptPubKey;
2786 scriptPubKey << mapReuseKey[pfrom->addr] << OP_CHECKSIG;
2787 pfrom->PushMessage("reply", hashReply, (int)0, scriptPubKey);
2791 else if (strCommand == "reply")
2796 CRequestTracker tracker;
2798 LOCK(pfrom->cs_mapRequests);
2799 map<uint256, CRequestTracker>::iterator mi = pfrom->mapRequests.find(hashReply);
2800 if (mi != pfrom->mapRequests.end())
2802 tracker = (*mi).second;
2803 pfrom->mapRequests.erase(mi);
2806 if (!tracker.IsNull())
2807 tracker.fn(tracker.param1, vRecv);
2811 else if (strCommand == "ping")
2813 if (pfrom->nVersion > BIP0031_VERSION)
2817 // Echo the message back with the nonce. This allows for two useful features:
2819 // 1) A remote node can quickly check if the connection is operational
2820 // 2) Remote nodes can measure the latency of the network thread. If this node
2821 // is overloaded it won't respond to pings quickly and the remote node can
2822 // avoid sending us more work, like chain download requests.
2824 // The nonce stops the remote getting confused between different pings: without
2825 // it, if the remote node sends a ping once per second and this node takes 5
2826 // seconds to respond to each, the 5th ping the remote sends would appear to
2827 // return very quickly.
2828 pfrom->PushMessage("pong", nonce);
2833 else if (strCommand == "alert")
2838 if (alert.ProcessAlert())
2841 pfrom->setKnown.insert(alert.GetHash());
2844 BOOST_FOREACH(CNode* pnode, vNodes)
2845 alert.RelayTo(pnode);
2853 // Ignore unknown commands for extensibility
2857 // Update the last seen time for this node's address
2858 if (pfrom->fNetworkNode)
2859 if (strCommand == "version" || strCommand == "addr" || strCommand == "inv" || strCommand == "getdata" || strCommand == "ping")
2860 AddressCurrentlyConnected(pfrom->addr);
2866 bool ProcessMessages(CNode* pfrom)
2868 CDataStream& vRecv = pfrom->vRecv;
2872 // printf("ProcessMessages(%u bytes)\n", vRecv.size());
2876 // (4) message start
2885 // Scan for message start
2886 CDataStream::iterator pstart = search(vRecv.begin(), vRecv.end(), BEGIN(pchMessageStart), END(pchMessageStart));
2887 int nHeaderSize = vRecv.GetSerializeSize(CMessageHeader());
2888 if (vRecv.end() - pstart < nHeaderSize)
2890 if ((int)vRecv.size() > nHeaderSize)
2892 printf("\n\nPROCESSMESSAGE MESSAGESTART NOT FOUND\n\n");
2893 vRecv.erase(vRecv.begin(), vRecv.end() - nHeaderSize);
2897 if (pstart - vRecv.begin() > 0)
2898 printf("\n\nPROCESSMESSAGE SKIPPED %d BYTES\n\n", pstart - vRecv.begin());
2899 vRecv.erase(vRecv.begin(), pstart);
2902 vector<char> vHeaderSave(vRecv.begin(), vRecv.begin() + nHeaderSize);
2907 printf("\n\nPROCESSMESSAGE: ERRORS IN HEADER %s\n\n\n", hdr.GetCommand().c_str());
2910 string strCommand = hdr.GetCommand();
2913 unsigned int nMessageSize = hdr.nMessageSize;
2914 if (nMessageSize > MAX_SIZE)
2916 printf("ProcessMessage(%s, %u bytes) : nMessageSize > MAX_SIZE\n", strCommand.c_str(), nMessageSize);
2919 if (nMessageSize > vRecv.size())
2921 // Rewind and wait for rest of message
2922 vRecv.insert(vRecv.begin(), vHeaderSave.begin(), vHeaderSave.end());
2927 uint256 hash = Hash(vRecv.begin(), vRecv.begin() + nMessageSize);
2928 unsigned int nChecksum = 0;
2929 memcpy(&nChecksum, &hash, sizeof(nChecksum));
2930 if (nChecksum != hdr.nChecksum)
2932 printf("ProcessMessage(%s, %u bytes) : CHECKSUM ERROR nChecksum=%08x hdr.nChecksum=%08x\n",
2933 strCommand.c_str(), nMessageSize, nChecksum, hdr.nChecksum);
2937 // Copy message to its own buffer
2938 CDataStream vMsg(vRecv.begin(), vRecv.begin() + nMessageSize, vRecv.nType, vRecv.nVersion);
2939 vRecv.ignore(nMessageSize);
2947 fRet = ProcessMessage(pfrom, strCommand, vMsg);
2952 catch (std::ios_base::failure& e)
2954 if (strstr(e.what(), "end of data"))
2956 // Allow exceptions from underlength message on vRecv
2957 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());
2959 else if (strstr(e.what(), "size too large"))
2961 // Allow exceptions from overlong size
2962 printf("ProcessMessage(%s, %u bytes) : Exception '%s' caught\n", strCommand.c_str(), nMessageSize, e.what());
2966 PrintExceptionContinue(&e, "ProcessMessage()");
2969 catch (std::exception& e) {
2970 PrintExceptionContinue(&e, "ProcessMessage()");
2972 PrintExceptionContinue(NULL, "ProcessMessage()");
2976 printf("ProcessMessage(%s, %u bytes) FAILED\n", strCommand.c_str(), nMessageSize);
2984 bool SendMessages(CNode* pto, bool fSendTrickle)
2986 TRY_LOCK(cs_main, lockMain);
2988 // Don't send anything until we get their version message
2989 if (pto->nVersion == 0)
2992 // Keep-alive ping. We send a nonce of zero because we don't use it anywhere
2994 if (pto->nLastSend && GetTime() - pto->nLastSend > 30 * 60 && pto->vSend.empty()) {
2995 if (pto->nVersion > BIP0031_VERSION)
2996 pto->PushMessage("ping", 0);
2998 pto->PushMessage("ping");
3001 // Resend wallet transactions that haven't gotten in a block yet
3002 ResendWalletTransactions();
3004 // Address refresh broadcast
3005 static int64 nLastRebroadcast;
3006 if (!IsInitialBlockDownload() && (GetTime() - nLastRebroadcast > 24 * 60 * 60))
3010 BOOST_FOREACH(CNode* pnode, vNodes)
3012 // Periodically clear setAddrKnown to allow refresh broadcasts
3013 if (nLastRebroadcast)
3014 pnode->setAddrKnown.clear();
3016 // Rebroadcast our address
3017 if (!fNoListen && !fUseProxy)
3019 CAddress addr = GetLocalAddress(&pnode->addr);
3020 if (addr.IsRoutable())
3021 pnode->PushAddress(addr);
3025 nLastRebroadcast = GetTime();
3033 vector<CAddress> vAddr;
3034 vAddr.reserve(pto->vAddrToSend.size());
3035 BOOST_FOREACH(const CAddress& addr, pto->vAddrToSend)
3037 // returns true if wasn't already contained in the set
3038 if (pto->setAddrKnown.insert(addr).second)
3040 vAddr.push_back(addr);
3041 // receiver rejects addr messages larger than 1000
3042 if (vAddr.size() >= 1000)
3044 pto->PushMessage("addr", vAddr);
3049 pto->vAddrToSend.clear();
3051 pto->PushMessage("addr", vAddr);
3056 // Message: inventory
3059 vector<CInv> vInvWait;
3061 LOCK(pto->cs_inventory);
3062 vInv.reserve(pto->vInventoryToSend.size());
3063 vInvWait.reserve(pto->vInventoryToSend.size());
3064 BOOST_FOREACH(const CInv& inv, pto->vInventoryToSend)
3066 if (pto->setInventoryKnown.count(inv))
3069 // trickle out tx inv to protect privacy
3070 if (inv.type == MSG_TX && !fSendTrickle)
3072 // 1/4 of tx invs blast to all immediately
3073 static uint256 hashSalt;
3075 RAND_bytes((unsigned char*)&hashSalt, sizeof(hashSalt));
3076 uint256 hashRand = inv.hash ^ hashSalt;
3077 hashRand = Hash(BEGIN(hashRand), END(hashRand));
3078 bool fTrickleWait = ((hashRand & 3) != 0);
3080 // always trickle our own transactions
3084 if (GetTransaction(inv.hash, wtx))
3086 fTrickleWait = true;
3091 vInvWait.push_back(inv);
3096 // returns true if wasn't already contained in the set
3097 if (pto->setInventoryKnown.insert(inv).second)
3099 vInv.push_back(inv);
3100 if (vInv.size() >= 1000)
3102 pto->PushMessage("inv", vInv);
3107 pto->vInventoryToSend = vInvWait;
3110 pto->PushMessage("inv", vInv);
3116 vector<CInv> vGetData;
3117 int64 nNow = GetTime() * 1000000;
3119 while (!pto->mapAskFor.empty() && (*pto->mapAskFor.begin()).first <= nNow)
3121 const CInv& inv = (*pto->mapAskFor.begin()).second;
3122 if (!AlreadyHave(txdb, inv))
3124 printf("sending getdata: %s\n", inv.ToString().c_str());
3125 vGetData.push_back(inv);
3126 if (vGetData.size() >= 1000)
3128 pto->PushMessage("getdata", vGetData);
3132 mapAlreadyAskedFor[inv] = nNow;
3133 pto->mapAskFor.erase(pto->mapAskFor.begin());
3135 if (!vGetData.empty())
3136 pto->PushMessage("getdata", vGetData);
3155 //////////////////////////////////////////////////////////////////////////////
3160 int static FormatHashBlocks(void* pbuffer, unsigned int len)
3162 unsigned char* pdata = (unsigned char*)pbuffer;
3163 unsigned int blocks = 1 + ((len + 8) / 64);
3164 unsigned char* pend = pdata + 64 * blocks;
3165 memset(pdata + len, 0, 64 * blocks - len);
3167 unsigned int bits = len * 8;
3168 pend[-1] = (bits >> 0) & 0xff;
3169 pend[-2] = (bits >> 8) & 0xff;
3170 pend[-3] = (bits >> 16) & 0xff;
3171 pend[-4] = (bits >> 24) & 0xff;
3175 static const unsigned int pSHA256InitState[8] =
3176 {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
3178 void SHA256Transform(void* pstate, void* pinput, const void* pinit)
3181 unsigned char data[64];
3185 for (int i = 0; i < 16; i++)
3186 ((uint32_t*)data)[i] = ByteReverse(((uint32_t*)pinput)[i]);
3188 for (int i = 0; i < 8; i++)
3189 ctx.h[i] = ((uint32_t*)pinit)[i];
3191 SHA256_Update(&ctx, data, sizeof(data));
3192 for (int i = 0; i < 8; i++)
3193 ((uint32_t*)pstate)[i] = ctx.h[i];
3197 // ScanHash scans nonces looking for a hash with at least some zero bits.
3198 // It operates on big endian data. Caller does the byte reversing.
3199 // All input buffers are 16-byte aligned. nNonce is usually preserved
3200 // between calls, but periodically or if nNonce is 0xffff0000 or above,
3201 // the block is rebuilt and nNonce starts over at zero.
3203 unsigned int static ScanHash_CryptoPP(char* pmidstate, char* pdata, char* phash1, char* phash, unsigned int& nHashesDone)
3205 unsigned int& nNonce = *(unsigned int*)(pdata + 12);
3209 // Hash pdata using pmidstate as the starting state into
3210 // preformatted buffer phash1, then hash phash1 into phash
3212 SHA256Transform(phash1, pdata, pmidstate);
3213 SHA256Transform(phash, phash1, pSHA256InitState);
3215 // Return the nonce if the hash has at least some zero bits,
3216 // caller will check if it has enough to reach the target
3217 if (((unsigned short*)phash)[14] == 0)
3220 // If nothing found after trying for a while, return -1
3221 if ((nNonce & 0xffff) == 0)
3223 nHashesDone = 0xffff+1;
3224 return (unsigned int) -1;
3229 // Some explaining would be appreciated
3234 set<uint256> setDependsOn;
3237 COrphan(CTransaction* ptxIn)
3245 printf("COrphan(hash=%s, dPriority=%.1f)\n", ptx->GetHash().ToString().substr(0,10).c_str(), dPriority);
3246 BOOST_FOREACH(uint256 hash, setDependsOn)
3247 printf(" setDependsOn %s\n", hash.ToString().substr(0,10).c_str());
3252 uint64 nLastBlockTx = 0;
3253 uint64 nLastBlockSize = 0;
3255 CBlock* CreateNewBlock(CReserveKey& reservekey)
3257 CBlockIndex* pindexPrev = pindexBest;
3260 auto_ptr<CBlock> pblock(new CBlock());
3264 // Create coinbase tx
3266 txNew.vin.resize(1);
3267 txNew.vin[0].prevout.SetNull();
3268 txNew.vout.resize(1);
3269 txNew.vout[0].scriptPubKey << reservekey.GetReservedKey() << OP_CHECKSIG;
3271 // Add our coinbase tx as first transaction
3272 pblock->vtx.push_back(txNew);
3274 // Collect memory pool transactions into the block
3277 LOCK2(cs_main, mempool.cs);
3280 // Priority order to process transactions
3281 list<COrphan> vOrphan; // list memory doesn't move
3282 map<uint256, vector<COrphan*> > mapDependers;
3283 multimap<double, CTransaction*> mapPriority;
3284 for (map<uint256, CTransaction>::iterator mi = mempool.mapTx.begin(); mi != mempool.mapTx.end(); ++mi)
3286 CTransaction& tx = (*mi).second;
3287 if (tx.IsCoinBase() || !tx.IsFinal())
3290 COrphan* porphan = NULL;
3291 double dPriority = 0;
3292 BOOST_FOREACH(const CTxIn& txin, tx.vin)
3294 // Read prev transaction
3295 CTransaction txPrev;
3297 if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
3299 // Has to wait for dependencies
3302 // Use list for automatic deletion
3303 vOrphan.push_back(COrphan(&tx));
3304 porphan = &vOrphan.back();
3306 mapDependers[txin.prevout.hash].push_back(porphan);
3307 porphan->setDependsOn.insert(txin.prevout.hash);
3310 int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
3312 // Read block header
3313 int nConf = txindex.GetDepthInMainChain();
3315 dPriority += (double)nValueIn * nConf;
3317 if (fDebug && GetBoolArg("-printpriority"))
3318 printf("priority nValueIn=%-12"PRI64d" nConf=%-5d dPriority=%-20.1f\n", nValueIn, nConf, dPriority);
3321 // Priority is sum(valuein * age) / txsize
3322 dPriority /= ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
3325 porphan->dPriority = dPriority;
3327 mapPriority.insert(make_pair(-dPriority, &(*mi).second));
3329 if (fDebug && GetBoolArg("-printpriority"))
3331 printf("priority %-20.1f %s\n%s", dPriority, tx.GetHash().ToString().substr(0,10).c_str(), tx.ToString().c_str());
3338 // Collect transactions into block
3339 map<uint256, CTxIndex> mapTestPool;
3340 uint64 nBlockSize = 1000;
3341 uint64 nBlockTx = 0;
3342 int nBlockSigOps = 100;
3343 while (!mapPriority.empty())
3345 // Take highest priority transaction off priority queue
3346 double dPriority = -(*mapPriority.begin()).first;
3347 CTransaction& tx = *(*mapPriority.begin()).second;
3348 mapPriority.erase(mapPriority.begin());
3351 unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
3352 if (nBlockSize + nTxSize >= MAX_BLOCK_SIZE_GEN)
3355 // Legacy limits on sigOps:
3356 unsigned int nTxSigOps = tx.GetLegacySigOpCount();
3357 if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
3360 // Transaction fee required depends on block size
3361 bool fAllowFree = (nBlockSize + nTxSize < 4000 || CTransaction::AllowFree(dPriority));
3362 int64 nMinFee = tx.GetMinFee(nBlockSize, fAllowFree, GMF_BLOCK);
3364 // Connecting shouldn't fail due to dependency on other memory pool transactions
3365 // because we're already processing them in order of dependency
3366 map<uint256, CTxIndex> mapTestPoolTmp(mapTestPool);
3367 MapPrevTx mapInputs;
3369 if (!tx.FetchInputs(txdb, mapTestPoolTmp, false, true, mapInputs, fInvalid))
3372 int64 nTxFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
3373 if (nTxFees < nMinFee)
3376 nTxSigOps += tx.GetP2SHSigOpCount(mapInputs);
3377 if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
3380 if (!tx.ConnectInputs(mapInputs, mapTestPoolTmp, CDiskTxPos(1,1,1), pindexPrev, false, true))
3382 mapTestPoolTmp[tx.GetHash()] = CTxIndex(CDiskTxPos(1,1,1), tx.vout.size());
3383 swap(mapTestPool, mapTestPoolTmp);
3386 pblock->vtx.push_back(tx);
3387 nBlockSize += nTxSize;
3389 nBlockSigOps += nTxSigOps;
3392 // Add transactions that depend on this one to the priority queue
3393 uint256 hash = tx.GetHash();
3394 if (mapDependers.count(hash))
3396 BOOST_FOREACH(COrphan* porphan, mapDependers[hash])
3398 if (!porphan->setDependsOn.empty())
3400 porphan->setDependsOn.erase(hash);
3401 if (porphan->setDependsOn.empty())
3402 mapPriority.insert(make_pair(-porphan->dPriority, porphan->ptx));
3408 nLastBlockTx = nBlockTx;
3409 nLastBlockSize = nBlockSize;
3410 printf("CreateNewBlock(): total size %lu\n", nBlockSize);
3413 pblock->vtx[0].vout[0].nValue = GetBlockValue(pindexPrev->nHeight+1, nFees);
3416 pblock->hashPrevBlock = pindexPrev->GetBlockHash();
3417 pblock->hashMerkleRoot = pblock->BuildMerkleTree();
3418 pblock->UpdateTime(pindexPrev);
3419 pblock->nBits = GetNextWorkRequired(pindexPrev, pblock.get());
3422 return pblock.release();
3426 void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce)
3428 // Update nExtraNonce
3429 static uint256 hashPrevBlock;
3430 if (hashPrevBlock != pblock->hashPrevBlock)
3433 hashPrevBlock = pblock->hashPrevBlock;
3436 pblock->vtx[0].vin[0].scriptSig = (CScript() << pblock->nTime << CBigNum(nExtraNonce)) + COINBASE_FLAGS;
3437 assert(pblock->vtx[0].vin[0].scriptSig.size() <= 100);
3439 pblock->hashMerkleRoot = pblock->BuildMerkleTree();
3443 void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1)
3446 // Prebuild hash buffers
3453 uint256 hashPrevBlock;
3454 uint256 hashMerkleRoot;
3457 unsigned int nNonce;
3460 unsigned char pchPadding0[64];
3462 unsigned char pchPadding1[64];
3465 memset(&tmp, 0, sizeof(tmp));
3467 tmp.block.nVersion = pblock->nVersion;
3468 tmp.block.hashPrevBlock = pblock->hashPrevBlock;
3469 tmp.block.hashMerkleRoot = pblock->hashMerkleRoot;
3470 tmp.block.nTime = pblock->nTime;
3471 tmp.block.nBits = pblock->nBits;
3472 tmp.block.nNonce = pblock->nNonce;
3474 FormatHashBlocks(&tmp.block, sizeof(tmp.block));
3475 FormatHashBlocks(&tmp.hash1, sizeof(tmp.hash1));
3477 // Byte swap all the input buffer
3478 for (unsigned int i = 0; i < sizeof(tmp)/4; i++)
3479 ((unsigned int*)&tmp)[i] = ByteReverse(((unsigned int*)&tmp)[i]);
3481 // Precalc the first half of the first hash, which stays constant
3482 SHA256Transform(pmidstate, &tmp.block, pSHA256InitState);
3484 memcpy(pdata, &tmp.block, 128);
3485 memcpy(phash1, &tmp.hash1, 64);
3489 bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
3491 uint256 hash = pblock->GetHash();
3492 uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
3494 if (hash > hashTarget)
3498 printf("BitcoinMiner:\n");
3499 printf("proof-of-work found \n hash: %s \ntarget: %s\n", hash.GetHex().c_str(), hashTarget.GetHex().c_str());
3501 printf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue).c_str());
3506 if (pblock->hashPrevBlock != hashBestChain)
3507 return error("BitcoinMiner : generated block is stale");
3509 // Remove key from key pool
3510 reservekey.KeepKey();
3512 // Track how many getdata requests this block gets
3514 LOCK(wallet.cs_wallet);
3515 wallet.mapRequestCount[pblock->GetHash()] = 0;
3518 // Process this block the same as if we had received it from another node
3519 if (!ProcessBlock(NULL, pblock))
3520 return error("BitcoinMiner : ProcessBlock, block not accepted");
3526 void static ThreadBitcoinMiner(void* parg);
3528 static bool fGenerateBitcoins = false;
3529 static bool fLimitProcessors = false;
3530 static int nLimitProcessors = -1;
3532 void static BitcoinMiner(CWallet *pwallet)
3534 printf("BitcoinMiner started\n");
3535 SetThreadPriority(THREAD_PRIORITY_LOWEST);
3537 // Each thread has its own key and counter
3538 CReserveKey reservekey(pwallet);
3539 unsigned int nExtraNonce = 0;
3541 while (fGenerateBitcoins)
3545 while (vNodes.empty() || IsInitialBlockDownload())
3550 if (!fGenerateBitcoins)
3558 unsigned int nTransactionsUpdatedLast = nTransactionsUpdated;
3559 CBlockIndex* pindexPrev = pindexBest;
3561 auto_ptr<CBlock> pblock(CreateNewBlock(reservekey));
3564 IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce);
3566 printf("Running BitcoinMiner with %d transactions in block\n", pblock->vtx.size());
3570 // Prebuild hash buffers
3572 char pmidstatebuf[32+16]; char* pmidstate = alignup<16>(pmidstatebuf);
3573 char pdatabuf[128+16]; char* pdata = alignup<16>(pdatabuf);
3574 char phash1buf[64+16]; char* phash1 = alignup<16>(phash1buf);
3576 FormatHashBuffers(pblock.get(), pmidstate, pdata, phash1);
3578 unsigned int& nBlockTime = *(unsigned int*)(pdata + 64 + 4);
3579 unsigned int& nBlockBits = *(unsigned int*)(pdata + 64 + 8);
3580 unsigned int& nBlockNonce = *(unsigned int*)(pdata + 64 + 12);
3586 int64 nStart = GetTime();
3587 uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
3589 uint256& hash = *alignup<16>(hashbuf);
3592 unsigned int nHashesDone = 0;
3593 unsigned int nNonceFound;
3596 nNonceFound = ScanHash_CryptoPP(pmidstate, pdata + 64, phash1,
3597 (char*)&hash, nHashesDone);
3599 // Check if something found
3600 if (nNonceFound != (unsigned int) -1)
3602 for (unsigned int i = 0; i < sizeof(hash)/4; i++)
3603 ((unsigned int*)&hash)[i] = ByteReverse(((unsigned int*)&hash)[i]);
3605 if (hash <= hashTarget)
3608 pblock->nNonce = ByteReverse(nNonceFound);
3609 assert(hash == pblock->GetHash());
3611 SetThreadPriority(THREAD_PRIORITY_NORMAL);
3612 CheckWork(pblock.get(), *pwalletMain, reservekey);
3613 SetThreadPriority(THREAD_PRIORITY_LOWEST);
3619 static int64 nHashCounter;
3620 if (nHPSTimerStart == 0)
3622 nHPSTimerStart = GetTimeMillis();
3626 nHashCounter += nHashesDone;
3627 if (GetTimeMillis() - nHPSTimerStart > 4000)
3629 static CCriticalSection cs;
3632 if (GetTimeMillis() - nHPSTimerStart > 4000)
3634 dHashesPerSec = 1000.0 * nHashCounter / (GetTimeMillis() - nHPSTimerStart);
3635 nHPSTimerStart = GetTimeMillis();
3637 static int64 nLogTime;
3638 if (GetTime() - nLogTime > 30 * 60)
3640 nLogTime = GetTime();
3641 printf("hashmeter %3d CPUs %6.0f khash/s\n", vnThreadsRunning[THREAD_MINER], dHashesPerSec/1000.0);
3647 // Check for stop or if block needs to be rebuilt
3650 if (!fGenerateBitcoins)
3652 if (fLimitProcessors && vnThreadsRunning[THREAD_MINER] > nLimitProcessors)
3656 if (nBlockNonce >= 0xffff0000)
3658 if (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 60)
3660 if (pindexPrev != pindexBest)
3663 // Update nTime every few seconds
3664 pblock->UpdateTime(pindexPrev);
3665 nBlockTime = ByteReverse(pblock->nTime);
3668 // Changing pblock->nTime can change work required on testnet:
3669 nBlockBits = ByteReverse(pblock->nBits);
3670 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
3676 void static ThreadBitcoinMiner(void* parg)
3678 CWallet* pwallet = (CWallet*)parg;
3681 vnThreadsRunning[THREAD_MINER]++;
3682 BitcoinMiner(pwallet);
3683 vnThreadsRunning[THREAD_MINER]--;
3685 catch (std::exception& e) {
3686 vnThreadsRunning[THREAD_MINER]--;
3687 PrintException(&e, "ThreadBitcoinMiner()");
3689 vnThreadsRunning[THREAD_MINER]--;
3690 PrintException(NULL, "ThreadBitcoinMiner()");
3693 if (vnThreadsRunning[THREAD_MINER] == 0)
3695 printf("ThreadBitcoinMiner exiting, %d threads remaining\n", vnThreadsRunning[THREAD_MINER]);
3699 void GenerateBitcoins(bool fGenerate, CWallet* pwallet)
3701 fGenerateBitcoins = fGenerate;
3702 nLimitProcessors = GetArg("-genproclimit", -1);
3703 if (nLimitProcessors == 0)
3704 fGenerateBitcoins = false;
3705 fLimitProcessors = (nLimitProcessors != -1);
3709 int nProcessors = boost::thread::hardware_concurrency();
3710 printf("%d processors\n", nProcessors);
3711 if (nProcessors < 1)
3713 if (fLimitProcessors && nProcessors > nLimitProcessors)
3714 nProcessors = nLimitProcessors;
3715 int nAddThreads = nProcessors - vnThreadsRunning[THREAD_MINER];
3716 printf("Starting %d BitcoinMiner threads\n", nAddThreads);
3717 for (int i = 0; i < nAddThreads; i++)
3719 if (!CreateThread(ThreadBitcoinMiner, pwallet))
3720 printf("Error: CreateThread(ThreadBitcoinMiner) failed\n");