1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2012 The Bitcoin developers
3 // Copyright (c) 2011-2012 The PPCoin developers
4 // Distributed under the MIT/X11 software license, see the accompanying
5 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
7 #include "checkpoints.h"
11 #include "ui_interface.h"
12 #include <boost/algorithm/string/replace.hpp>
13 #include <boost/filesystem.hpp>
14 #include <boost/filesystem/fstream.hpp>
17 using namespace boost;
23 CCriticalSection cs_setpwalletRegistered;
24 set<CWallet*> setpwalletRegistered;
26 CCriticalSection cs_main;
29 unsigned int nTransactionsUpdated = 0;
31 map<uint256, CBlockIndex*> mapBlockIndex;
32 set<pair<COutPoint, unsigned int> > setStakeSeen;
33 uint256 hashGenesisBlock = hashGenesisBlockOfficial;
34 static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
35 static CBigNum bnInitialHashTarget(~uint256(0) >> 40);
36 CBlockIndex* pindexGenesisBlock = NULL;
38 CBigNum bnBestChainTrust = 0;
39 CBigNum bnBestInvalidTrust = 0;
40 uint256 hashBestChain = 0;
41 CBlockIndex* pindexBest = NULL;
42 int64 nTimeBestReceived = 0;
44 CMedianFilter<int> cPeerBlockCounts(5, 0); // Amount of blocks that other nodes claim to have
46 map<uint256, CBlock*> mapOrphanBlocks;
47 multimap<uint256, CBlock*> mapOrphanBlocksByPrev;
48 set<pair<COutPoint, unsigned int> > setStakeSeenOrphan;
50 map<uint256, CDataStream*> mapOrphanTransactions;
51 map<uint256, map<uint256, CDataStream*> > mapOrphanTransactionsByPrev;
53 // Constant stuff for coinbase transactions we create:
54 CScript COINBASE_FLAGS;
56 const string strMessageMagic = "PPCoin Signed Message:\n";
62 int64 nTransactionFee = MIN_TX_FEE;
66 //////////////////////////////////////////////////////////////////////////////
68 // dispatching functions
71 // These functions dispatch to one or all registered wallets
74 void RegisterWallet(CWallet* pwalletIn)
77 LOCK(cs_setpwalletRegistered);
78 setpwalletRegistered.insert(pwalletIn);
82 void UnregisterWallet(CWallet* pwalletIn)
85 LOCK(cs_setpwalletRegistered);
86 setpwalletRegistered.erase(pwalletIn);
90 // check whether the passed transaction is from us
91 bool static IsFromMe(CTransaction& tx)
93 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
94 if (pwallet->IsFromMe(tx))
99 // get the wallet transaction with the given hash (if it exists)
100 bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
102 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
103 if (pwallet->GetTransaction(hashTx,wtx))
108 // erases transaction with the given hash from all wallets
109 void static EraseFromWallets(uint256 hash)
111 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
112 pwallet->EraseFromWallet(hash);
115 // make sure all wallets know about the given transaction, in the given block
116 void static SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL, bool fUpdate = false, bool fConnect = true)
120 // ppcoin: wallets need to refund inputs when disconnecting coinstake
121 if (tx.IsCoinStake())
123 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
124 if (pwallet->IsFromMe(tx))
125 pwallet->DisableTransaction(tx);
130 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
131 pwallet->AddToWalletIfInvolvingMe(tx, pblock, fUpdate);
134 // notify wallets about a new best chain
135 void static SetBestChain(const CBlockLocator& loc)
137 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
138 pwallet->SetBestChain(loc);
141 // notify wallets about an updated transaction
142 void static UpdatedTransaction(const uint256& hashTx)
144 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
145 pwallet->UpdatedTransaction(hashTx);
149 void static PrintWallets(const CBlock& block)
151 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
152 pwallet->PrintWallet(block);
155 // notify wallets about an incoming inventory (for request counts)
156 void static Inventory(const uint256& hash)
158 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
159 pwallet->Inventory(hash);
162 // ask wallets to resend their transactions
163 void static ResendWalletTransactions()
165 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
166 pwallet->ResendWalletTransactions();
175 //////////////////////////////////////////////////////////////////////////////
177 // mapOrphanTransactions
180 bool AddOrphanTx(const CDataStream& vMsg)
183 CDataStream(vMsg) >> tx;
184 uint256 hash = tx.GetHash();
185 if (mapOrphanTransactions.count(hash))
188 CDataStream* pvMsg = new CDataStream(vMsg);
190 // Ignore big transactions, to avoid a
191 // send-big-orphans memory exhaustion attack. If a peer has a legitimate
192 // large transaction with a missing parent then we assume
193 // it will rebroadcast it later, after the parent transaction(s)
194 // have been mined or received.
195 // 10,000 orphans, each of which is at most 5,000 bytes big is
196 // at most 500 megabytes of orphans:
197 if (pvMsg->size() > 5000)
199 printf("ignoring large orphan tx (size: %u, hash: %s)\n", pvMsg->size(), hash.ToString().substr(0,10).c_str());
204 mapOrphanTransactions[hash] = pvMsg;
205 BOOST_FOREACH(const CTxIn& txin, tx.vin)
206 mapOrphanTransactionsByPrev[txin.prevout.hash].insert(make_pair(hash, pvMsg));
208 printf("stored orphan tx %s (mapsz %u)\n", hash.ToString().substr(0,10).c_str(),
209 mapOrphanTransactions.size());
213 void static EraseOrphanTx(uint256 hash)
215 if (!mapOrphanTransactions.count(hash))
217 const CDataStream* pvMsg = mapOrphanTransactions[hash];
219 CDataStream(*pvMsg) >> tx;
220 BOOST_FOREACH(const CTxIn& txin, tx.vin)
222 mapOrphanTransactionsByPrev[txin.prevout.hash].erase(hash);
223 if (mapOrphanTransactionsByPrev[txin.prevout.hash].empty())
224 mapOrphanTransactionsByPrev.erase(txin.prevout.hash);
227 mapOrphanTransactions.erase(hash);
230 unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
232 unsigned int nEvicted = 0;
233 while (mapOrphanTransactions.size() > nMaxOrphans)
235 // Evict a random orphan:
236 uint256 randomhash = GetRandHash();
237 map<uint256, CDataStream*>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
238 if (it == mapOrphanTransactions.end())
239 it = mapOrphanTransactions.begin();
240 EraseOrphanTx(it->first);
252 //////////////////////////////////////////////////////////////////////////////
254 // CTransaction and CTxIndex
257 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet)
260 if (!txdb.ReadTxIndex(prevout.hash, txindexRet))
262 if (!ReadFromDisk(txindexRet.pos))
264 if (prevout.n >= vout.size())
272 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout)
275 return ReadFromDisk(txdb, prevout, txindex);
278 bool CTransaction::ReadFromDisk(COutPoint prevout)
282 return ReadFromDisk(txdb, prevout, txindex);
285 bool CTransaction::IsStandard() const
287 BOOST_FOREACH(const CTxIn& txin, vin)
289 // Biggest 'standard' txin is a 3-signature 3-of-3 CHECKMULTISIG
290 // pay-to-script-hash, which is 3 ~80-byte signatures, 3
291 // ~65-byte public keys, plus a few script ops.
292 if (txin.scriptSig.size() > 500)
294 if (!txin.scriptSig.IsPushOnly())
297 BOOST_FOREACH(const CTxOut& txout, vout)
298 if (!::IsStandard(txout.scriptPubKey))
304 // Check transaction inputs, and make sure any
305 // pay-to-script-hash transactions are evaluating IsStandard scripts
307 // Why bother? To avoid denial-of-service attacks; an attacker
308 // can submit a standard HASH... OP_EQUAL transaction,
309 // which will get accepted into blocks. The redemption
310 // script can be anything; an attacker could use a very
311 // expensive-to-check-upon-redemption script like:
312 // DUP CHECKSIG DROP ... repeated 100 times... OP_1
314 bool CTransaction::AreInputsStandard(const MapPrevTx& mapInputs) const
317 return true; // Coinbases don't use vin normally
319 for (unsigned int i = 0; i < vin.size(); i++)
321 const CTxOut& prev = GetOutputFor(vin[i], mapInputs);
323 vector<vector<unsigned char> > vSolutions;
324 txnouttype whichType;
325 // get the scriptPubKey corresponding to this input:
326 const CScript& prevScript = prev.scriptPubKey;
327 if (!Solver(prevScript, whichType, vSolutions))
329 int nArgsExpected = ScriptSigArgsExpected(whichType, vSolutions);
330 if (nArgsExpected < 0)
333 // Transactions with extra stuff in their scriptSigs are
334 // non-standard. Note that this EvalScript() call will
335 // be quick, because if there are any operations
336 // beside "push data" in the scriptSig the
337 // IsStandard() call returns false
338 vector<vector<unsigned char> > stack;
339 if (!EvalScript(stack, vin[i].scriptSig, *this, i, 0))
342 if (whichType == TX_SCRIPTHASH)
346 CScript subscript(stack.back().begin(), stack.back().end());
347 vector<vector<unsigned char> > vSolutions2;
348 txnouttype whichType2;
349 if (!Solver(subscript, whichType2, vSolutions2))
351 if (whichType2 == TX_SCRIPTHASH)
355 tmpExpected = ScriptSigArgsExpected(whichType2, vSolutions2);
358 nArgsExpected += tmpExpected;
361 if (stack.size() != (unsigned int)nArgsExpected)
369 CTransaction::GetLegacySigOpCount() const
371 unsigned int nSigOps = 0;
372 BOOST_FOREACH(const CTxIn& txin, vin)
374 nSigOps += txin.scriptSig.GetSigOpCount(false);
376 BOOST_FOREACH(const CTxOut& txout, vout)
378 nSigOps += txout.scriptPubKey.GetSigOpCount(false);
384 int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
396 // Load the block this tx is in
398 if (!CTxDB("r").ReadTxIndex(GetHash(), txindex))
400 if (!blockTmp.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos))
405 // Update the tx's hashBlock
406 hashBlock = pblock->GetHash();
408 // Locate the transaction
409 for (nIndex = 0; nIndex < (int)pblock->vtx.size(); nIndex++)
410 if (pblock->vtx[nIndex] == *(CTransaction*)this)
412 if (nIndex == (int)pblock->vtx.size())
414 vMerkleBranch.clear();
416 printf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
420 // Fill in merkle branch
421 vMerkleBranch = pblock->GetMerkleBranch(nIndex);
424 // Is the tx in a block that's in the main chain
425 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
426 if (mi == mapBlockIndex.end())
428 CBlockIndex* pindex = (*mi).second;
429 if (!pindex || !pindex->IsInMainChain())
432 return pindexBest->nHeight - pindex->nHeight + 1;
441 bool CTransaction::CheckTransaction() const
443 // Basic checks that don't depend on any context
445 return DoS(10, error("CTransaction::CheckTransaction() : vin empty"));
447 return DoS(10, error("CTransaction::CheckTransaction() : vout empty"));
449 if (::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
450 return DoS(100, error("CTransaction::CheckTransaction() : size limits failed"));
452 // Check for negative or overflow output values
454 for (int i = 0; i < vout.size(); i++)
456 const CTxOut& txout = vout[i];
457 if (txout.IsEmpty() && (!IsCoinBase()) && (!IsCoinStake()))
458 return DoS(100, error("CTransaction::CheckTransaction() : txout empty for user transaction"));
459 // ppcoin: enforce minimum output amount
460 if ((!txout.IsEmpty()) && txout.nValue < MIN_TXOUT_AMOUNT)
461 return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue below minimum"));
462 if (txout.nValue > MAX_MONEY)
463 return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue too high"));
464 nValueOut += txout.nValue;
465 if (!MoneyRange(nValueOut))
466 return DoS(100, error("CTransaction::CheckTransaction() : txout total out of range"));
469 // Check for duplicate inputs
470 set<COutPoint> vInOutPoints;
471 BOOST_FOREACH(const CTxIn& txin, vin)
473 if (vInOutPoints.count(txin.prevout))
475 vInOutPoints.insert(txin.prevout);
480 if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
481 return DoS(100, error("CTransaction::CheckTransaction() : coinbase script size"));
485 BOOST_FOREACH(const CTxIn& txin, vin)
486 if (txin.prevout.IsNull())
487 return DoS(10, error("CTransaction::CheckTransaction() : prevout is null"));
493 bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
494 bool* pfMissingInputs)
497 *pfMissingInputs = false;
499 if (!tx.CheckTransaction())
500 return error("CTxMemPool::accept() : CheckTransaction failed");
502 // Coinbase is only valid in a block, not as a loose transaction
504 return tx.DoS(100, error("CTxMemPool::accept() : coinbase as individual tx"));
505 // ppcoin: coinstake is also only valid in a block, not as a loose transaction
506 if (tx.IsCoinStake())
507 return tx.DoS(100, error("CTxMemPool::accept() : coinstake as individual tx"));
509 // To help v0.1.5 clients who would see it as a negative number
510 if ((int64)tx.nLockTime > std::numeric_limits<int>::max())
511 return error("CTxMemPool::accept() : not accepting nLockTime beyond 2038 yet");
513 // Rather not work on nonstandard transactions (unless -testnet)
514 if (!fTestNet && !tx.IsStandard())
515 return error("CTxMemPool::accept() : nonstandard transaction type");
517 // Do we already have it?
518 uint256 hash = tx.GetHash();
521 if (mapTx.count(hash))
525 if (txdb.ContainsTx(hash))
528 // Check for conflicts with in-memory transactions
529 CTransaction* ptxOld = NULL;
530 for (unsigned int i = 0; i < tx.vin.size(); i++)
532 COutPoint outpoint = tx.vin[i].prevout;
533 if (mapNextTx.count(outpoint))
535 // Disable replacement feature for now
538 // Allow replacing with a newer version of the same transaction
541 ptxOld = mapNextTx[outpoint].ptx;
542 if (ptxOld->IsFinal())
544 if (!tx.IsNewerThan(*ptxOld))
546 for (unsigned int i = 0; i < tx.vin.size(); i++)
548 COutPoint outpoint = tx.vin[i].prevout;
549 if (!mapNextTx.count(outpoint) || mapNextTx[outpoint].ptx != ptxOld)
559 map<uint256, CTxIndex> mapUnused;
560 bool fInvalid = false;
561 if (!tx.FetchInputs(txdb, mapUnused, false, false, mapInputs, fInvalid))
564 return error("CTxMemPool::accept() : FetchInputs found invalid tx %s", hash.ToString().substr(0,10).c_str());
566 *pfMissingInputs = true;
567 return error("CTxMemPool::accept() : FetchInputs failed %s", hash.ToString().substr(0,10).c_str());
570 // Check for non-standard pay-to-script-hash in inputs
571 if (!tx.AreInputsStandard(mapInputs) && !fTestNet)
572 return error("CTxMemPool::accept() : nonstandard transaction input");
574 // Note: if you modify this code to accept non-standard transactions, then
575 // you should add code here to check that the transaction does a
576 // reasonable number of ECDSA signature verifications.
578 int64 nFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
579 unsigned int nSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
581 // Don't accept it if it can't get into a block
582 if (nFees < tx.GetMinFee(1000, false, GMF_RELAY))
583 return error("CTxMemPool::accept() : not enough fees");
585 // Continuously rate-limit free transactions
586 // This mitigates 'penny-flooding' -- sending thousands of free transactions just to
587 // be annoying or make other's transactions take longer to confirm.
588 if (nFees < MIN_RELAY_TX_FEE)
590 static CCriticalSection cs;
591 static double dFreeCount;
592 static int64 nLastTime;
593 int64 nNow = GetTime();
597 // Use an exponentially decaying ~10-minute window:
598 dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
600 // -limitfreerelay unit is thousand-bytes-per-minute
601 // At default rate it would take over a month to fill 1GB
602 if (dFreeCount > GetArg("-limitfreerelay", 15)*10*1000 && !IsFromMe(tx))
603 return error("CTxMemPool::accept() : free transaction rejected by rate limiter");
605 printf("Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
610 // Check against previous transactions
611 // This is done last to help prevent CPU exhaustion denial-of-service attacks.
612 if (!tx.ConnectInputs(txdb, mapInputs, mapUnused, CDiskTxPos(1,1,1), pindexBest, false, false))
614 return error("CTxMemPool::accept() : ConnectInputs failed %s", hash.ToString().substr(0,10).c_str());
618 // Store transaction in memory
623 printf("CTxMemPool::accept() : replacing tx %s with new version\n", ptxOld->GetHash().ToString().c_str());
629 ///// are we sure this is ok when loading transactions or restoring block txes
630 // If updated, erase old tx from wallet
632 EraseFromWallets(ptxOld->GetHash());
634 printf("CTxMemPool::accept() : accepted %s\n", hash.ToString().substr(0,10).c_str());
638 bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMissingInputs)
640 return mempool.accept(txdb, *this, fCheckInputs, pfMissingInputs);
643 bool CTxMemPool::addUnchecked(CTransaction &tx)
645 printf("addUnchecked(): size %lu\n", mapTx.size());
646 // Add to memory pool without checking anything. Don't call this directly,
647 // call CTxMemPool::accept to properly check the transaction first.
650 uint256 hash = tx.GetHash();
652 for (unsigned int i = 0; i < tx.vin.size(); i++)
653 mapNextTx[tx.vin[i].prevout] = CInPoint(&mapTx[hash], i);
654 nTransactionsUpdated++;
660 bool CTxMemPool::remove(CTransaction &tx)
662 // Remove transaction from memory pool
665 uint256 hash = tx.GetHash();
666 if (mapTx.count(hash))
668 BOOST_FOREACH(const CTxIn& txin, tx.vin)
669 mapNextTx.erase(txin.prevout);
671 nTransactionsUpdated++;
682 int CMerkleTx::GetDepthInMainChain(CBlockIndex* &pindexRet) const
684 if (hashBlock == 0 || nIndex == -1)
687 // Find the block it claims to be in
688 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
689 if (mi == mapBlockIndex.end())
691 CBlockIndex* pindex = (*mi).second;
692 if (!pindex || !pindex->IsInMainChain())
695 // Make sure the merkle branch connects to this block
696 if (!fMerkleVerified)
698 if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != pindex->hashMerkleRoot)
700 fMerkleVerified = true;
704 return pindexBest->nHeight - pindex->nHeight + 1;
708 int CMerkleTx::GetBlocksToMaturity() const
710 if (!(IsCoinBase() || IsCoinStake()))
712 return max(0, (COINBASE_MATURITY+20) - GetDepthInMainChain());
716 bool CMerkleTx::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs)
720 if (!IsInMainChain() && !ClientConnectInputs())
722 return CTransaction::AcceptToMemoryPool(txdb, false);
726 return CTransaction::AcceptToMemoryPool(txdb, fCheckInputs);
730 bool CMerkleTx::AcceptToMemoryPool()
733 return AcceptToMemoryPool(txdb);
738 bool CWalletTx::AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs)
743 // Add previous supporting transactions first
744 BOOST_FOREACH(CMerkleTx& tx, vtxPrev)
746 if (!(tx.IsCoinBase() || tx.IsCoinStake()))
748 uint256 hash = tx.GetHash();
749 if (!mempool.exists(hash) && !txdb.ContainsTx(hash))
750 tx.AcceptToMemoryPool(txdb, fCheckInputs);
753 return AcceptToMemoryPool(txdb, fCheckInputs);
758 bool CWalletTx::AcceptWalletTransaction()
761 return AcceptWalletTransaction(txdb);
764 int CTxIndex::GetDepthInMainChain() const
768 if (!block.ReadFromDisk(pos.nFile, pos.nBlockPos, false))
770 // Find the block in the index
771 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(block.GetHash());
772 if (mi == mapBlockIndex.end())
774 CBlockIndex* pindex = (*mi).second;
775 if (!pindex || !pindex->IsInMainChain())
777 return 1 + nBestHeight - pindex->nHeight;
789 //////////////////////////////////////////////////////////////////////////////
791 // CBlock and CBlockIndex
794 bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
796 if (!fReadTransactions)
798 *this = pindex->GetBlockHeader();
801 if (!ReadFromDisk(pindex->nFile, pindex->nBlockPos, fReadTransactions))
803 if (GetHash() != pindex->GetBlockHash())
804 return error("CBlock::ReadFromDisk() : GetHash() doesn't match index");
808 uint256 static GetOrphanRoot(const CBlock* pblock)
810 // Work back to the first block in the orphan chain
811 while (mapOrphanBlocks.count(pblock->hashPrevBlock))
812 pblock = mapOrphanBlocks[pblock->hashPrevBlock];
813 return pblock->GetHash();
816 // ppcoin: find block wanted by given orphan block
817 uint256 WantedByOrphan(const CBlock* pblockOrphan)
819 // Work back to the first block in the orphan chain
820 while (mapOrphanBlocks.count(pblockOrphan->hashPrevBlock))
821 pblockOrphan = mapOrphanBlocks[pblockOrphan->hashPrevBlock];
822 return pblockOrphan->hashPrevBlock;
825 int64 static GetProofOfWorkReward(unsigned int nBits)
827 CBigNum bnSubsidyLimit = MAX_MINT_PROOF_OF_WORK;
829 bnTarget.SetCompact(nBits);
830 CBigNum bnTargetLimit = bnProofOfWorkLimit;
831 bnTargetLimit.SetCompact(bnTargetLimit.GetCompact());
833 // ppcoin: subsidy is cut in half every 16x multiply of difficulty
834 // A reasonably continuous curve is used to avoid shock to market
835 // (nSubsidyLimit / nSubsidy) ** 4 == bnProofOfWorkLimit / bnTarget
836 CBigNum bnLowerBound = CENT;
837 CBigNum bnUpperBound = bnSubsidyLimit;
838 while (bnLowerBound + CENT <= bnUpperBound)
840 CBigNum bnMidValue = (bnLowerBound + bnUpperBound) / 2;
841 if (fDebug && GetBoolArg("-printcreation"))
842 printf("GetProofOfWorkReward() : lower=%"PRI64d" upper=%"PRI64d" mid=%"PRI64d"\n", bnLowerBound.getuint64(), bnUpperBound.getuint64(), bnMidValue.getuint64());
843 if (bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnTargetLimit > bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnTarget)
844 bnUpperBound = bnMidValue;
846 bnLowerBound = bnMidValue;
849 int64 nSubsidy = bnUpperBound.getuint64();
850 nSubsidy = (nSubsidy / CENT) * CENT;
851 if (fDebug && GetBoolArg("-printcreation"))
852 printf("GetProofOfWorkReward() : create=%s nBits=0x%08x nSubsidy=%"PRI64d"\n", FormatMoney(nSubsidy).c_str(), nBits, nSubsidy);
854 return min(nSubsidy, MAX_MINT_PROOF_OF_WORK);
857 // ppcoin: miner's coin stake is rewarded based on coin age spent (coin-days)
858 int64 GetProofOfStakeReward(int64 nCoinAge)
860 static int64 nRewardCoinYear = CENT; // creation amount per coin-year
861 int64 nSubsidy = nCoinAge * 33 / (365 * 33 + 8) * nRewardCoinYear;
862 if (fDebug && GetBoolArg("-printcreation"))
863 printf("GetProofOfStakeReward(): create=%s nCoinAge=%"PRI64d"\n", FormatMoney(nSubsidy).c_str(), nCoinAge);
867 static const int64 nTargetTimespan = 7 * 24 * 60 * 60; // one week
868 static const int64 nTargetSpacingStake = 10 * 60; // ten minutes
869 static const int64 nTargetSpacingWorkMax = 2 * 60 * 60; // two hours
870 static const int64 nMaxClockDrift = 2 * 60 * 60; // two hours
873 // minimum amount of work that could possibly be required nTime after
874 // minimum work required was nBase
876 unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
879 bnResult.SetCompact(nBase);
881 while (nTime > 0 && bnResult < bnProofOfWorkLimit)
883 // Maximum 200% adjustment per day...
885 nTime -= 24 * 60 * 60;
887 if (bnResult > bnProofOfWorkLimit)
888 bnResult = bnProofOfWorkLimit;
889 return bnResult.GetCompact();
892 // ppcoin: find last block index up to pindex
893 const CBlockIndex* GetLastBlockIndex(const CBlockIndex* pindex, bool fProofOfStake)
895 while (pindex && pindex->pprev && (pindex->IsProofOfStake() != fProofOfStake))
896 pindex = pindex->pprev;
900 unsigned int static GetNextTargetRequired(const CBlockIndex* pindexLast, bool fProofOfStake)
902 if (pindexLast == NULL)
903 return bnProofOfWorkLimit.GetCompact(); // genesis block
905 const CBlockIndex* pindexPrev = GetLastBlockIndex(pindexLast, fProofOfStake);
906 if (pindexPrev->pprev == NULL)
907 return bnInitialHashTarget.GetCompact(); // first block
908 const CBlockIndex* pindexPrevPrev = GetLastBlockIndex(pindexPrev->pprev, fProofOfStake);
909 if (pindexPrevPrev->pprev == NULL)
910 return bnInitialHashTarget.GetCompact(); // second block
912 int64 nActualSpacing = pindexPrev->GetBlockTime() - pindexPrevPrev->GetBlockTime();
914 // ppcoin: target change every block
915 // ppcoin: retarget with exponential moving toward target spacing
917 bnNew.SetCompact(pindexPrev->nBits);
918 int64 nTargetSpacing = fProofOfStake? nTargetSpacingStake : min(nTargetSpacingWorkMax, nTargetSpacingStake * (1 + pindexLast->nHeight - pindexPrev->nHeight));
919 int64 nInterval = nTargetTimespan / nTargetSpacing;
920 bnNew *= ((nInterval - 1) * nTargetSpacing + nActualSpacing + nActualSpacing);
921 bnNew /= ((nInterval + 1) * nTargetSpacing);
923 if (bnNew > bnProofOfWorkLimit)
924 bnNew = bnProofOfWorkLimit;
926 return bnNew.GetCompact();
929 bool CheckProofOfWork(uint256 hash, unsigned int nBits)
932 bnTarget.SetCompact(nBits);
935 if (bnTarget <= 0 || bnTarget > bnProofOfWorkLimit)
936 return error("CheckProofOfWork() : nBits below minimum work");
938 // Check proof of work matches claimed amount
939 if (hash > bnTarget.getuint256())
940 return error("CheckProofOfWork() : hash doesn't match nBits");
945 // Return maximum amount of blocks that other nodes claim to have
946 int GetNumBlocksOfPeers()
948 return std::max(cPeerBlockCounts.median(), Checkpoints::GetTotalBlocksEstimate());
951 bool IsInitialBlockDownload()
953 if (pindexBest == NULL || nBestHeight < Checkpoints::GetTotalBlocksEstimate())
955 static int64 nLastUpdate;
956 static CBlockIndex* pindexLastBest;
957 if (pindexBest != pindexLastBest)
959 pindexLastBest = pindexBest;
960 nLastUpdate = GetTime();
962 return (GetTime() - nLastUpdate < 10 &&
963 pindexBest->GetBlockTime() < GetTime() - 24 * 60 * 60);
966 void static InvalidChainFound(CBlockIndex* pindexNew)
968 if (pindexNew->bnChainTrust > bnBestInvalidTrust)
970 bnBestInvalidTrust = pindexNew->bnChainTrust;
971 CTxDB().WriteBestInvalidTrust(bnBestInvalidTrust);
974 printf("InvalidChainFound: invalid block=%s height=%d trust=%s\n", pindexNew->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->nHeight, CBigNum(pindexNew->bnChainTrust).ToString().c_str());
975 printf("InvalidChainFound: current best=%s height=%d trust=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, CBigNum(bnBestChainTrust).ToString().c_str());
976 // ppcoin: should not enter safe mode for longer invalid chain
979 void CBlock::UpdateTime(const CBlockIndex* pindexPrev)
981 nTime = max(GetBlockTime(), GetAdjustedTime());
994 bool CTransaction::DisconnectInputs(CTxDB& txdb)
996 // Relinquish previous transactions' spent pointers
999 BOOST_FOREACH(const CTxIn& txin, vin)
1001 COutPoint prevout = txin.prevout;
1003 // Get prev txindex from disk
1005 if (!txdb.ReadTxIndex(prevout.hash, txindex))
1006 return error("DisconnectInputs() : ReadTxIndex failed");
1008 if (prevout.n >= txindex.vSpent.size())
1009 return error("DisconnectInputs() : prevout.n out of range");
1011 // Mark outpoint as not spent
1012 txindex.vSpent[prevout.n].SetNull();
1015 if (!txdb.UpdateTxIndex(prevout.hash, txindex))
1016 return error("DisconnectInputs() : UpdateTxIndex failed");
1020 // Remove transaction from index
1021 // This can fail if a duplicate of this transaction was in a chain that got
1022 // reorganized away. This is only possible if this transaction was completely
1023 // spent, so erasing it would be a no-op anway.
1024 txdb.EraseTxIndex(*this);
1030 bool CTransaction::FetchInputs(CTxDB& txdb, const map<uint256, CTxIndex>& mapTestPool,
1031 bool fBlock, bool fMiner, MapPrevTx& inputsRet, bool& fInvalid)
1033 // FetchInputs can return false either because we just haven't seen some inputs
1034 // (in which case the transaction should be stored as an orphan)
1035 // or because the transaction is malformed (in which case the transaction should
1036 // be dropped). If tx is definitely invalid, fInvalid will be set to true.
1040 return true; // Coinbase transactions have no inputs to fetch.
1042 for (unsigned int i = 0; i < vin.size(); i++)
1044 COutPoint prevout = vin[i].prevout;
1045 if (inputsRet.count(prevout.hash))
1046 continue; // Got it already
1049 CTxIndex& txindex = inputsRet[prevout.hash].first;
1051 if ((fBlock || fMiner) && mapTestPool.count(prevout.hash))
1053 // Get txindex from current proposed changes
1054 txindex = mapTestPool.find(prevout.hash)->second;
1058 // Read txindex from txdb
1059 fFound = txdb.ReadTxIndex(prevout.hash, txindex);
1061 if (!fFound && (fBlock || fMiner))
1062 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());
1065 CTransaction& txPrev = inputsRet[prevout.hash].second;
1066 if (!fFound || txindex.pos == CDiskTxPos(1,1,1))
1068 // Get prev tx from single transactions in memory
1071 if (!mempool.exists(prevout.hash))
1072 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());
1073 txPrev = mempool.lookup(prevout.hash);
1076 txindex.vSpent.resize(txPrev.vout.size());
1080 // Get prev tx from disk
1081 if (!txPrev.ReadFromDisk(txindex.pos))
1082 return error("FetchInputs() : %s ReadFromDisk prev tx %s failed", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
1086 // Make sure all prevout.n's are valid:
1087 for (unsigned int i = 0; i < vin.size(); i++)
1089 const COutPoint prevout = vin[i].prevout;
1090 assert(inputsRet.count(prevout.hash) != 0);
1091 const CTxIndex& txindex = inputsRet[prevout.hash].first;
1092 const CTransaction& txPrev = inputsRet[prevout.hash].second;
1093 if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
1095 // Revisit this if/when transaction replacement is implemented and allows
1098 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()));
1105 const CTxOut& CTransaction::GetOutputFor(const CTxIn& input, const MapPrevTx& inputs) const
1107 MapPrevTx::const_iterator mi = inputs.find(input.prevout.hash);
1108 if (mi == inputs.end())
1109 throw std::runtime_error("CTransaction::GetOutputFor() : prevout.hash not found");
1111 const CTransaction& txPrev = (mi->second).second;
1112 if (input.prevout.n >= txPrev.vout.size())
1113 throw std::runtime_error("CTransaction::GetOutputFor() : prevout.n out of range");
1115 return txPrev.vout[input.prevout.n];
1118 int64 CTransaction::GetValueIn(const MapPrevTx& inputs) const
1124 for (unsigned int i = 0; i < vin.size(); i++)
1126 nResult += GetOutputFor(vin[i], inputs).nValue;
1132 unsigned int CTransaction::GetP2SHSigOpCount(const MapPrevTx& inputs) const
1137 unsigned int nSigOps = 0;
1138 for (unsigned int i = 0; i < vin.size(); i++)
1140 const CTxOut& prevout = GetOutputFor(vin[i], inputs);
1141 if (prevout.scriptPubKey.IsPayToScriptHash())
1142 nSigOps += prevout.scriptPubKey.GetSigOpCount(vin[i].scriptSig);
1147 bool CTransaction::ConnectInputs(CTxDB& txdb, MapPrevTx inputs,
1148 map<uint256, CTxIndex>& mapTestPool, const CDiskTxPos& posThisTx,
1149 const CBlockIndex* pindexBlock, bool fBlock, bool fMiner, bool fStrictPayToScriptHash)
1151 // Take over previous transactions' spent pointers
1152 // fBlock is true when this is called from AcceptBlock when a new best-block is added to the blockchain
1153 // fMiner is true when called from the internal bitcoin miner
1154 // ... both are false when called from CTransaction::AcceptToMemoryPool
1159 for (unsigned int i = 0; i < vin.size(); i++)
1161 COutPoint prevout = vin[i].prevout;
1162 assert(inputs.count(prevout.hash) > 0);
1163 CTxIndex& txindex = inputs[prevout.hash].first;
1164 CTransaction& txPrev = inputs[prevout.hash].second;
1166 if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
1167 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()));
1169 // If prev is coinbase/coinstake, check that it's matured
1170 if (txPrev.IsCoinBase() || txPrev.IsCoinStake())
1171 for (const CBlockIndex* pindex = pindexBlock; pindex && pindexBlock->nHeight - pindex->nHeight < COINBASE_MATURITY; pindex = pindex->pprev)
1172 if (pindex->nBlockPos == txindex.pos.nBlockPos && pindex->nFile == txindex.pos.nFile)
1173 return error("ConnectInputs() : tried to spend coinbase/coinstake at depth %d", pindexBlock->nHeight - pindex->nHeight);
1175 // ppcoin: check transaction timestamp
1176 if (txPrev.nTime > nTime)
1177 return DoS(100, error("ConnectInputs() : transaction timestamp earlier than input transaction"));
1179 // Check for negative or overflow input values
1180 nValueIn += txPrev.vout[prevout.n].nValue;
1181 if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
1182 return DoS(100, error("ConnectInputs() : txin values out of range"));
1185 // The first loop above does all the inexpensive checks.
1186 // Only if ALL inputs pass do we perform expensive ECDSA signature checks.
1187 // Helps prevent CPU exhaustion attacks.
1188 for (unsigned int i = 0; i < vin.size(); i++)
1190 COutPoint prevout = vin[i].prevout;
1191 assert(inputs.count(prevout.hash) > 0);
1192 CTxIndex& txindex = inputs[prevout.hash].first;
1193 CTransaction& txPrev = inputs[prevout.hash].second;
1195 // Check for conflicts (double-spend)
1196 // This doesn't trigger the DoS code on purpose; if it did, it would make it easier
1197 // for an attacker to attempt to split the network.
1198 if (!txindex.vSpent[prevout.n].IsNull())
1199 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());
1201 // Skip ECDSA signature verification when connecting blocks (fBlock=true)
1202 // before the last blockchain checkpoint. This is safe because block merkle hashes are
1203 // still computed and checked, and any change will be caught at the next checkpoint.
1204 if (!(fBlock && (nBestHeight < Checkpoints::GetTotalBlocksEstimate())))
1207 if (!VerifySignature(txPrev, *this, i, fStrictPayToScriptHash, 0))
1209 // only during transition phase for P2SH: do not invoke anti-DoS code for
1210 // potentially old clients relaying bad P2SH transactions
1211 if (fStrictPayToScriptHash && VerifySignature(txPrev, *this, i, false, 0))
1212 return error("ConnectInputs() : %s P2SH VerifySignature failed", GetHash().ToString().substr(0,10).c_str());
1214 return DoS(100,error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str()));
1218 // Mark outpoints as spent
1219 txindex.vSpent[prevout.n] = posThisTx;
1222 if (fBlock || fMiner)
1224 mapTestPool[prevout.hash] = txindex;
1230 // ppcoin: coin stake tx earns reward instead of paying fee
1232 if (!GetCoinAge(txdb, nCoinAge))
1233 return error("ConnectInputs() : %s unable to get coin age for coinstake", GetHash().ToString().substr(0,10).c_str());
1234 int64 nStakeReward = GetValueOut() - nValueIn;
1235 if (nStakeReward > GetProofOfStakeReward(nCoinAge))
1236 return DoS(100, error("ConnectInputs() : %s stake reward exceeded", GetHash().ToString().substr(0,10).c_str()));
1240 if (nValueIn < GetValueOut())
1241 return DoS(100, error("ConnectInputs() : %s value in < value out", GetHash().ToString().substr(0,10).c_str()));
1243 // Tally transaction fees
1244 int64 nTxFee = nValueIn - GetValueOut();
1246 return DoS(100, error("ConnectInputs() : %s nTxFee < 0", GetHash().ToString().substr(0,10).c_str()));
1247 // ppcoin: enforce transaction fees for every block
1248 if (nTxFee < GetMinFee())
1249 return fBlock? DoS(100, error("ConnectInputs() : %s not paying required fee=%s, paid=%s", GetHash().ToString().substr(0,10).c_str(), FormatMoney(GetMinFee()).c_str(), FormatMoney(nTxFee).c_str())) : false;
1251 if (!MoneyRange(nFees))
1252 return DoS(100, error("ConnectInputs() : nFees out of range"));
1260 bool CTransaction::ClientConnectInputs()
1265 // Take over previous transactions' spent pointers
1269 for (unsigned int i = 0; i < vin.size(); i++)
1271 // Get prev tx from single transactions in memory
1272 COutPoint prevout = vin[i].prevout;
1273 if (!mempool.exists(prevout.hash))
1275 CTransaction& txPrev = mempool.lookup(prevout.hash);
1277 if (prevout.n >= txPrev.vout.size())
1281 if (!VerifySignature(txPrev, *this, i, true, 0))
1282 return error("ConnectInputs() : VerifySignature failed");
1284 ///// this is redundant with the mempool.mapNextTx stuff,
1285 ///// not sure which I want to get rid of
1286 ///// this has to go away now that posNext is gone
1287 // // Check for conflicts
1288 // if (!txPrev.vout[prevout.n].posNext.IsNull())
1289 // return error("ConnectInputs() : prev tx already used");
1291 // // Flag outpoints as used
1292 // txPrev.vout[prevout.n].posNext = posThisTx;
1294 nValueIn += txPrev.vout[prevout.n].nValue;
1296 if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
1297 return error("ClientConnectInputs() : txin values out of range");
1299 if (GetValueOut() > nValueIn)
1309 bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
1311 // Disconnect in reverse order
1312 for (int i = vtx.size()-1; i >= 0; i--)
1313 if (!vtx[i].DisconnectInputs(txdb))
1316 // Update block index on disk without changing it in memory.
1317 // The memory index structure will be changed after the db commits.
1320 CDiskBlockIndex blockindexPrev(pindex->pprev);
1321 blockindexPrev.hashNext = 0;
1322 if (!txdb.WriteBlockIndex(blockindexPrev))
1323 return error("DisconnectBlock() : WriteBlockIndex failed");
1326 // ppcoin: clean up wallet after disconnecting coinstake
1327 BOOST_FOREACH(CTransaction& tx, vtx)
1328 SyncWithWallets(tx, this, false, false);
1333 bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
1335 // Check it again in case a previous version let a bad block in
1339 // Do not allow blocks that contain transactions which 'overwrite' older transactions,
1340 // unless those are already completely spent.
1341 // If such overwrites are allowed, coinbases and transactions depending upon those
1342 // can be duplicated to remove the ability to spend the first instance -- even after
1343 // being sent to another address.
1344 // See BIP30 and http://r6.ca/blog/20120206T005236Z.html for more information.
1345 // This logic is not necessary for memory pool transactions, as AcceptToMemoryPool
1346 // already refuses previously-known transaction id's entirely.
1347 // This rule applies to all blocks whose timestamp is after March 15, 2012, 0:00 UTC.
1348 // On testnet it is enabled as of februari 20, 2012, 0:00 UTC.
1349 if (pindex->nTime > 1331769600 || (fTestNet && pindex->nTime > 1329696000))
1351 BOOST_FOREACH(CTransaction& tx, vtx)
1353 CTxIndex txindexOld;
1354 if (txdb.ReadTxIndex(tx.GetHash(), txindexOld))
1356 BOOST_FOREACH(CDiskTxPos &pos, txindexOld.vSpent)
1363 // BIP16 didn't become active until Apr 1 2012 (Feb 15 on testnet)
1364 int64 nBIP16SwitchTime = fTestNet ? 1329264000 : 1333238400;
1365 bool fStrictPayToScriptHash = (pindex->nTime >= nBIP16SwitchTime);
1367 //// issue here: it doesn't know the version
1368 unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK, CLIENT_VERSION) - (2 * GetSizeOfCompactSize(0)) + GetSizeOfCompactSize(vtx.size());
1370 map<uint256, CTxIndex> mapQueuedChanges;
1372 unsigned int nSigOps = 0;
1373 BOOST_FOREACH(CTransaction& tx, vtx)
1375 nSigOps += tx.GetLegacySigOpCount();
1376 if (nSigOps > MAX_BLOCK_SIGOPS)
1377 return DoS(100, error("ConnectBlock() : too many sigops"));
1379 CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
1380 nTxPos += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
1382 MapPrevTx mapInputs;
1383 if (!tx.IsCoinBase())
1386 if (!tx.FetchInputs(txdb, mapQueuedChanges, true, false, mapInputs, fInvalid))
1389 if (fStrictPayToScriptHash)
1391 // Add in sigops done by pay-to-script-hash inputs;
1392 // this is to prevent a "rogue miner" from creating
1393 // an incredibly-expensive-to-validate block.
1394 nSigOps += tx.GetP2SHSigOpCount(mapInputs);
1395 if (nSigOps > MAX_BLOCK_SIGOPS)
1396 return DoS(100, error("ConnectBlock() : too many sigops"));
1399 if (!tx.IsCoinStake())
1400 nFees += tx.GetValueIn(mapInputs)-tx.GetValueOut();
1402 if (!tx.ConnectInputs(txdb, mapInputs, mapQueuedChanges, posThisTx, pindex, true, false, fStrictPayToScriptHash))
1406 mapQueuedChanges[tx.GetHash()] = CTxIndex(posThisTx, tx.vout.size());
1409 // Write queued txindex changes
1410 for (map<uint256, CTxIndex>::iterator mi = mapQueuedChanges.begin(); mi != mapQueuedChanges.end(); ++mi)
1412 if (!txdb.UpdateTxIndex((*mi).first, (*mi).second))
1413 return error("ConnectBlock() : UpdateTxIndex failed");
1416 // ppcoin: fees are not collected by miners as in bitcoin
1417 // ppcoin: fees are destroyed to compensate the entire network
1418 if (IsProofOfWork() && vtx[0].GetValueOut() > GetProofOfWorkReward(nBits))
1420 if (fDebug && GetBoolArg("-printcreation"))
1421 printf("ConnectBlock() : destroy=%s nFees=%"PRI64d"\n", FormatMoney(nFees).c_str(), nFees);
1423 // Update block index on disk without changing it in memory.
1424 // The memory index structure will be changed after the db commits.
1427 CDiskBlockIndex blockindexPrev(pindex->pprev);
1428 blockindexPrev.hashNext = pindex->GetBlockHash();
1429 if (!txdb.WriteBlockIndex(blockindexPrev))
1430 return error("ConnectBlock() : WriteBlockIndex failed");
1433 // Watch for transactions paying to me
1434 BOOST_FOREACH(CTransaction& tx, vtx)
1435 SyncWithWallets(tx, this, true);
1440 bool Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
1442 printf("REORGANIZE\n");
1445 CBlockIndex* pfork = pindexBest;
1446 CBlockIndex* plonger = pindexNew;
1447 while (pfork != plonger)
1449 while (plonger->nHeight > pfork->nHeight)
1450 if (!(plonger = plonger->pprev))
1451 return error("Reorganize() : plonger->pprev is null");
1452 if (pfork == plonger)
1454 if (!(pfork = pfork->pprev))
1455 return error("Reorganize() : pfork->pprev is null");
1458 // List of what to disconnect
1459 vector<CBlockIndex*> vDisconnect;
1460 for (CBlockIndex* pindex = pindexBest; pindex != pfork; pindex = pindex->pprev)
1461 vDisconnect.push_back(pindex);
1463 // List of what to connect
1464 vector<CBlockIndex*> vConnect;
1465 for (CBlockIndex* pindex = pindexNew; pindex != pfork; pindex = pindex->pprev)
1466 vConnect.push_back(pindex);
1467 reverse(vConnect.begin(), vConnect.end());
1469 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());
1470 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());
1472 // Disconnect shorter branch
1473 vector<CTransaction> vResurrect;
1474 BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
1477 if (!block.ReadFromDisk(pindex))
1478 return error("Reorganize() : ReadFromDisk for disconnect failed");
1479 if (!block.DisconnectBlock(txdb, pindex))
1480 return error("Reorganize() : DisconnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
1482 // Queue memory transactions to resurrect
1483 BOOST_FOREACH(const CTransaction& tx, block.vtx)
1484 if (!(tx.IsCoinBase() || tx.IsCoinStake()))
1485 vResurrect.push_back(tx);
1488 // Connect longer branch
1489 vector<CTransaction> vDelete;
1490 for (unsigned int i = 0; i < vConnect.size(); i++)
1492 CBlockIndex* pindex = vConnect[i];
1494 if (!block.ReadFromDisk(pindex))
1495 return error("Reorganize() : ReadFromDisk for connect failed");
1496 if (!block.ConnectBlock(txdb, pindex))
1500 return error("Reorganize() : ConnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
1503 // Queue memory transactions to delete
1504 BOOST_FOREACH(const CTransaction& tx, block.vtx)
1505 vDelete.push_back(tx);
1507 if (!txdb.WriteHashBestChain(pindexNew->GetBlockHash()))
1508 return error("Reorganize() : WriteHashBestChain failed");
1510 // Make sure it's successfully written to disk before changing memory structure
1511 if (!txdb.TxnCommit())
1512 return error("Reorganize() : TxnCommit failed");
1514 // Disconnect shorter branch
1515 BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
1517 pindex->pprev->pnext = NULL;
1519 // Connect longer branch
1520 BOOST_FOREACH(CBlockIndex* pindex, vConnect)
1522 pindex->pprev->pnext = pindex;
1524 // Resurrect memory transactions that were in the disconnected branch
1525 BOOST_FOREACH(CTransaction& tx, vResurrect)
1526 tx.AcceptToMemoryPool(txdb, false);
1528 // Delete redundant memory transactions that are in the connected branch
1529 BOOST_FOREACH(CTransaction& tx, vDelete)
1532 printf("REORGANIZE: done\n");
1539 runCommand(std::string strCommand)
1541 int nErr = ::system(strCommand.c_str());
1543 printf("runCommand error: system(%s) returned %d\n", strCommand.c_str(), nErr);
1546 // Called from inside SetBestChain: attaches a block to the new best chain being built
1547 bool CBlock::SetBestChainInner(CTxDB& txdb, CBlockIndex *pindexNew)
1549 uint256 hash = GetHash();
1551 // Adding to current best branch
1552 if (!ConnectBlock(txdb, pindexNew) || !txdb.WriteHashBestChain(hash))
1555 InvalidChainFound(pindexNew);
1558 if (!txdb.TxnCommit())
1559 return error("SetBestChain() : TxnCommit failed");
1561 // Add to current best branch
1562 pindexNew->pprev->pnext = pindexNew;
1564 // Delete redundant memory transactions
1565 BOOST_FOREACH(CTransaction& tx, vtx)
1571 bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
1573 uint256 hash = GetHash();
1575 if (!txdb.TxnBegin())
1576 return error("SetBestChain() : TxnBegin failed");
1578 if (pindexGenesisBlock == NULL && hash == hashGenesisBlock)
1580 txdb.WriteHashBestChain(hash);
1581 if (!txdb.TxnCommit())
1582 return error("SetBestChain() : TxnCommit failed");
1583 pindexGenesisBlock = pindexNew;
1585 else if (hashPrevBlock == hashBestChain)
1587 if (!SetBestChainInner(txdb, pindexNew))
1588 return error("SetBestChain() : SetBestChainInner failed");
1592 // the first block in the new chain that will cause it to become the new best chain
1593 CBlockIndex *pindexIntermediate = pindexNew;
1595 // list of blocks that need to be connected afterwards
1596 std::vector<CBlockIndex*> vpindexSecondary;
1598 // Reorganize is costly in terms of db load, as it works in a single db transaction.
1599 // Try to limit how much needs to be done inside
1600 while (pindexIntermediate->pprev && pindexIntermediate->pprev->bnChainTrust > pindexBest->bnChainTrust)
1602 vpindexSecondary.push_back(pindexIntermediate);
1603 pindexIntermediate = pindexIntermediate->pprev;
1606 if (!vpindexSecondary.empty())
1607 printf("Postponing %i reconnects\n", vpindexSecondary.size());
1609 // Switch to new best branch
1610 if (!Reorganize(txdb, pindexIntermediate))
1613 InvalidChainFound(pindexNew);
1614 return error("SetBestChain() : Reorganize failed");
1617 // Connect futher blocks
1618 BOOST_REVERSE_FOREACH(CBlockIndex *pindex, vpindexSecondary)
1621 if (!block.ReadFromDisk(pindex))
1623 printf("SetBestChain() : ReadFromDisk failed\n");
1626 if (!txdb.TxnBegin()) {
1627 printf("SetBestChain() : TxnBegin 2 failed\n");
1630 // errors now are not fatal, we still did a reorganisation to a new chain in a valid way
1631 if (!block.SetBestChainInner(txdb, pindex))
1636 // Update best block in wallet (so we can detect restored wallets)
1637 bool fIsInitialDownload = IsInitialBlockDownload();
1638 if (!fIsInitialDownload)
1640 const CBlockLocator locator(pindexNew);
1641 ::SetBestChain(locator);
1645 hashBestChain = hash;
1646 pindexBest = pindexNew;
1647 nBestHeight = pindexBest->nHeight;
1648 bnBestChainTrust = pindexNew->bnChainTrust;
1649 nTimeBestReceived = GetTime();
1650 nTransactionsUpdated++;
1651 printf("SetBestChain: new best=%s height=%d trust=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainTrust.ToString().c_str());
1653 std::string strCmd = GetArg("-blocknotify", "");
1655 if (!fIsInitialDownload && !strCmd.empty())
1657 boost::replace_all(strCmd, "%s", hashBestChain.GetHex());
1658 boost::thread t(runCommand, strCmd); // thread runs free
1665 // ppcoin: coinstake must meet hash target according to the protocol:
1666 // input 0 must meet the formula
1667 // hash(nBits + txPrev.block.nTime + txPrev.offset + txPrev.nTime + txPrev.vout.n + nTime) < bnTarget * nCoinDay
1668 // this ensures that the chance of getting a coinstake is proportional to the
1669 // amount of coin age one owns.
1670 // The reason this hash is chosen is the following:
1671 // nBits: encodes all past block timestamps, making computing hash in advance
1673 // txPrev.block.nTime: prevent nodes from guessing a good timestamp to
1674 // generate transaction for future advantage
1675 // txPrev.offset: offset of txPrev inside block, to reduce the chance of
1676 // nodes generating coinstake at the same time
1677 // txPrev.nTime: reduce the chance of nodes generating coinstake at the same
1679 // txPrev.vout.n: output number of txPrev, to reduce the chance of nodes
1680 // generating coinstake at the same time
1681 // block/tx hash should not be used here as they can be generated in vast
1682 // quantities so as to generate blocks faster, degrading the system back into
1683 // a proof-of-work situation.
1685 bool CTransaction::CheckProofOfStake(unsigned int nBits) const
1687 CBigNum bnTargetPerCoinDay;
1688 bnTargetPerCoinDay.SetCompact(nBits);
1693 // Input 0 must match the stake hash target per coin age (nBits)
1694 const CTxIn& txin = vin[0];
1696 // First try finding the previous transaction in database
1698 CTransaction txPrev;
1700 if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
1701 return false; // previous transaction not in main chain
1703 if (nTime < txPrev.nTime)
1704 return false; // Transaction timestamp violation
1707 if (!VerifySignature(txPrev, *this, 0, true, 0))
1708 return DoS(100, error("CheckProofOfStake() : VerifySignature failed on coinstake %s", GetHash().ToString().c_str()));
1710 // Read block header
1712 if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
1713 return false; // unable to read block of previous transaction
1714 if (block.GetBlockTime() + STAKE_MIN_AGE > nTime)
1715 return false; // only count coins meeting min age requirement
1717 int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
1718 CBigNum bnCoinDay = CBigNum(nValueIn) * (nTime-txPrev.nTime) / COIN / (24 * 60 * 60);
1720 CDataStream ss(SER_GETHASH, 0);
1721 ss << nBits << block.nTime << (txindex.pos.nTxPos - txindex.pos.nBlockPos) << txPrev.nTime << txin.prevout.n << nTime;
1722 if (CBigNum(Hash(ss.begin(), ss.end())) <= bnCoinDay * bnTargetPerCoinDay)
1725 return DoS(100, error("CheckProofOfStake() : check target failed on coinstake %s", GetHash().ToString().c_str()));
1728 // ppcoin: total coin age spent in transaction, in the unit of coin-days.
1729 // Only those coins meeting minimum age requirement counts. As those
1730 // transactions not in main chain are not currently indexed so we
1731 // might not find out about their coin age. Older transactions are
1732 // guaranteed to be in main chain by sync-checkpoint. This rule is
1733 // introduced to help nodes establish a consistent view of the coin
1734 // age (trust score) of competing branches.
1735 bool CTransaction::GetCoinAge(CTxDB& txdb, uint64& nCoinAge) const
1737 CBigNum bnCentSecond = 0; // coin age in the unit of cent-seconds
1743 BOOST_FOREACH(const CTxIn& txin, vin)
1745 // First try finding the previous transaction in database
1746 CTransaction txPrev;
1748 if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
1749 continue; // previous transaction not in main chain
1750 if (nTime < txPrev.nTime)
1751 return false; // Transaction timestamp violation
1753 // Read block header
1755 if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
1756 return false; // unable to read block of previous transaction
1757 if (block.GetBlockTime() + STAKE_MIN_AGE > nTime)
1758 continue; // only count coins meeting min age requirement
1760 int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
1761 bnCentSecond += CBigNum(nValueIn) * (nTime-txPrev.nTime) / CENT;
1763 if (fDebug && GetBoolArg("-printcoinage"))
1764 printf("coin age nValueIn=%-12I64d nTimeDiff=%d bnCentSecond=%s\n", nValueIn, nTime - txPrev.nTime, bnCentSecond.ToString().c_str());
1767 CBigNum bnCoinDay = bnCentSecond * CENT / COIN / (24 * 60 * 60);
1768 if (fDebug && GetBoolArg("-printcoinage"))
1769 printf("coin age bnCoinDay=%s\n", bnCoinDay.ToString().c_str());
1770 nCoinAge = bnCoinDay.getuint64();
1774 // ppcoin: total coin age spent in block, in the unit of coin-days.
1775 bool CBlock::GetCoinAge(uint64& nCoinAge) const
1780 BOOST_FOREACH(const CTransaction& tx, vtx)
1783 if (tx.GetCoinAge(txdb, nTxCoinAge))
1784 nCoinAge += nTxCoinAge;
1789 if (nCoinAge == 0) // block coin age minimum 1 coin-day
1791 if (fDebug && GetBoolArg("-printcoinage"))
1792 printf("block coin age total nCoinDays=%"PRI64d"\n", nCoinAge);
1797 bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
1799 // Check for duplicate
1800 uint256 hash = GetHash();
1801 if (mapBlockIndex.count(hash))
1802 return error("AddToBlockIndex() : %s already exists", hash.ToString().substr(0,20).c_str());
1804 // Construct new block index object
1805 CBlockIndex* pindexNew = new CBlockIndex(nFile, nBlockPos, *this);
1807 return error("AddToBlockIndex() : new CBlockIndex failed");
1808 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
1809 if (pindexNew->fProofOfStake)
1810 setStakeSeen.insert(make_pair(pindexNew->prevoutStake, pindexNew->nStakeTime));
1812 pindexNew->phashBlock = &((*mi).first);
1813 map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(hashPrevBlock);
1814 if (miPrev != mapBlockIndex.end())
1816 pindexNew->pprev = (*miPrev).second;
1817 pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
1820 // ppcoin: compute chain trust score
1821 pindexNew->bnChainTrust = (pindexNew->pprev ? pindexNew->pprev->bnChainTrust : 0) + pindexNew->GetBlockTrust();
1824 if (!txdb.TxnBegin())
1826 txdb.WriteBlockIndex(CDiskBlockIndex(pindexNew));
1827 if (!txdb.TxnCommit())
1831 if (pindexNew->bnChainTrust > bnBestChainTrust)
1832 if (!SetBestChain(txdb, pindexNew))
1837 if (pindexNew == pindexBest)
1839 // Notify UI to display prev block's coinbase if it was ours
1840 static uint256 hashPrevBestCoinBase;
1841 UpdatedTransaction(hashPrevBestCoinBase);
1842 hashPrevBestCoinBase = vtx[0].GetHash();
1852 bool CBlock::CheckBlock() const
1854 // These are checks that are independent of context
1855 // that can be verified before saving an orphan block.
1858 if (vtx.empty() || vtx.size() > MAX_BLOCK_SIZE || ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
1859 return DoS(100, error("CheckBlock() : size limits failed"));
1861 // Check proof of work matches claimed amount
1862 if (IsProofOfWork() && !CheckProofOfWork(GetHash(), nBits))
1863 return DoS(50, error("CheckBlock() : proof of work failed"));
1866 if (GetBlockTime() > GetAdjustedTime() + nMaxClockDrift)
1867 return error("CheckBlock() : block timestamp too far in the future");
1869 // First transaction must be coinbase, the rest must not be
1870 if (vtx.empty() || !vtx[0].IsCoinBase())
1871 return DoS(100, error("CheckBlock() : first tx is not coinbase"));
1872 for (unsigned int i = 1; i < vtx.size(); i++)
1873 if (vtx[i].IsCoinBase())
1874 return DoS(100, error("CheckBlock() : more than one coinbase"));
1876 // ppcoin: only the second transaction can be the optional coinstake
1877 for (int i = 2; i < vtx.size(); i++)
1878 if (vtx[i].IsCoinStake())
1879 return DoS(100, error("CheckBlock() : coinstake in wrong position"));
1881 // ppcoin: coinbase output should be empty if proof-of-stake block
1882 if (IsProofOfStake() && !vtx[0].vout[0].IsEmpty())
1883 return error("CheckBlock() : coinbase output not empty for proof-of-stake block");
1885 // Check coinbase timestamp
1886 if (GetBlockTime() > (int64)vtx[0].nTime + nMaxClockDrift)
1887 return DoS(50, error("CheckBlock() : coinbase timestamp is too early"));
1889 // Check coinstake timestamp
1890 if (IsProofOfStake() && GetBlockTime() > (int64)vtx[1].nTime + nMaxClockDrift)
1891 return DoS(50, error("CheckBlock() : coinstake timestamp is too early"));
1893 // Check transactions
1894 BOOST_FOREACH(const CTransaction& tx, vtx)
1896 if (!tx.CheckTransaction())
1897 return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed"));
1898 // ppcoin: check transaction timestamp
1899 if (GetBlockTime() < (int64)tx.nTime)
1900 return DoS(50, error("CheckBlock() : block timestamp earlier than transaction timestamp"));
1903 // Check for duplicate txids. This is caught by ConnectInputs(),
1904 // but catching it earlier avoids a potential DoS attack:
1905 set<uint256> uniqueTx;
1906 BOOST_FOREACH(const CTransaction& tx, vtx)
1908 uniqueTx.insert(tx.GetHash());
1910 if (uniqueTx.size() != vtx.size())
1911 return DoS(100, error("CheckBlock() : duplicate transaction"));
1913 unsigned int nSigOps = 0;
1914 BOOST_FOREACH(const CTransaction& tx, vtx)
1916 nSigOps += tx.GetLegacySigOpCount();
1918 if (nSigOps > MAX_BLOCK_SIGOPS)
1919 return DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"));
1922 if (hashMerkleRoot != BuildMerkleTree())
1923 return DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
1925 // ppcoin: check block signature
1926 if (!CheckBlockSignature())
1927 return DoS(100, error("CheckBlock() : bad block signature"));
1932 bool CBlock::AcceptBlock()
1934 // Check for duplicate
1935 uint256 hash = GetHash();
1936 if (mapBlockIndex.count(hash))
1937 return error("AcceptBlock() : block already in mapBlockIndex");
1939 // Get prev block index
1940 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
1941 if (mi == mapBlockIndex.end())
1942 return DoS(10, error("AcceptBlock() : prev block not found"));
1943 CBlockIndex* pindexPrev = (*mi).second;
1944 int nHeight = pindexPrev->nHeight+1;
1946 // Check proof-of-work or proof-of-stake
1947 if (nBits != GetNextTargetRequired(pindexPrev, IsProofOfStake()))
1948 return DoS(100, error("AcceptBlock() : incorrect proof-of-work/proof-of-stake"));
1950 // Check timestamp against prev
1951 if (GetBlockTime() <= pindexPrev->GetMedianTimePast() || GetBlockTime() + nMaxClockDrift < pindexPrev->GetBlockTime())
1952 return error("AcceptBlock() : block's timestamp is too early");
1954 // Check that all transactions are finalized
1955 BOOST_FOREACH(const CTransaction& tx, vtx)
1956 if (!tx.IsFinal(nHeight, GetBlockTime()))
1957 return DoS(10, error("AcceptBlock() : contains a non-final transaction"));
1959 // Check that the block chain matches the known block chain up to a hardened checkpoint
1960 if (!Checkpoints::CheckHardened(nHeight, hash))
1961 return DoS(100, error("AcceptBlock() : rejected by hardened checkpoint lockin at %d", nHeight));
1963 // ppcoin: check that the block satisfies synchronized checkpoint
1964 if (!Checkpoints::CheckSync(hash, pindexPrev))
1965 return error("AcceptBlock() : rejected by synchronized checkpoint");
1967 // Write block to history file
1968 if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK, CLIENT_VERSION)))
1969 return error("AcceptBlock() : out of disk space");
1970 unsigned int nFile = -1;
1971 unsigned int nBlockPos = 0;
1972 if (!WriteToDisk(nFile, nBlockPos))
1973 return error("AcceptBlock() : WriteToDisk failed");
1974 if (!AddToBlockIndex(nFile, nBlockPos))
1975 return error("AcceptBlock() : AddToBlockIndex failed");
1977 // Relay inventory, but don't relay old inventory during initial block download
1978 int nBlockEstimate = Checkpoints::GetTotalBlocksEstimate();
1979 if (hashBestChain == hash)
1982 BOOST_FOREACH(CNode* pnode, vNodes)
1983 if (nBestHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : nBlockEstimate))
1984 pnode->PushInventory(CInv(MSG_BLOCK, hash));
1987 // ppcoin: check pending sync-checkpoint
1988 Checkpoints::AcceptPendingSyncCheckpoint();
1993 bool ProcessBlock(CNode* pfrom, CBlock* pblock)
1995 // Check for duplicate
1996 uint256 hash = pblock->GetHash();
1997 if (mapBlockIndex.count(hash))
1998 return error("ProcessBlock() : already have block %d %s", mapBlockIndex[hash]->nHeight, hash.ToString().substr(0,20).c_str());
1999 if (mapOrphanBlocks.count(hash))
2000 return error("ProcessBlock() : already have block (orphan) %s", hash.ToString().substr(0,20).c_str());
2002 // ppcoin: check proof-of-stake
2003 // Limited duplicity on stake: prevents block flood attack
2004 // Duplicate stake allowed only when there is orphan child block
2005 if (pblock->IsProofOfStake() && setStakeSeen.count(pblock->GetProofOfStake()) && !mapOrphanBlocksByPrev.count(hash) && !Checkpoints::WantedByPendingSyncCheckpoint(hash))
2006 return error("ProcessBlock() : duplicate proof-of-stake (%s, %d) for block %s", pblock->GetProofOfStake().first.ToString().c_str(), pblock->GetProofOfStake().second, hash.ToString().c_str());
2008 // Preliminary checks
2009 if (!pblock->CheckBlock())
2010 return error("ProcessBlock() : CheckBlock FAILED");
2012 // ppcoin: verify hash target and signature of coinstake tx
2013 if (pblock->IsProofOfStake() && !pblock->vtx[1].CheckProofOfStake(pblock->nBits))
2015 printf("WARNING: ProcessBlock(): check proof-of-stake failed for block %s\n", hash.ToString().c_str());
2016 return false; // do not error here as we expect this during initial block download
2019 CBlockIndex* pcheckpoint = Checkpoints::GetLastSyncCheckpoint();
2020 if (pcheckpoint && pblock->hashPrevBlock != hashBestChain && !Checkpoints::WantedByPendingSyncCheckpoint(hash))
2022 // Extra checks to prevent "fill up memory by spamming with bogus blocks"
2023 int64 deltaTime = pblock->GetBlockTime() - pcheckpoint->nTime;
2025 bnNewBlock.SetCompact(pblock->nBits);
2027 bnRequired.SetCompact(ComputeMinWork(GetLastBlockIndex(pcheckpoint, pblock->IsProofOfStake())->nBits, deltaTime));
2029 if (bnNewBlock > bnRequired)
2032 pfrom->Misbehaving(100);
2033 return error("ProcessBlock() : block with too little %s", pblock->IsProofOfStake()? "proof-of-stake" : "proof-of-work");
2037 // ppcoin: ask for pending sync-checkpoint if any
2038 if (!IsInitialBlockDownload())
2039 Checkpoints::AskForPendingSyncCheckpoint(pfrom);
2041 // If don't already have its previous block, shunt it off to holding area until we get it
2042 if (!mapBlockIndex.count(pblock->hashPrevBlock))
2044 printf("ProcessBlock: ORPHAN BLOCK, prev=%s\n", pblock->hashPrevBlock.ToString().substr(0,20).c_str());
2045 CBlock* pblock2 = new CBlock(*pblock);
2046 // ppcoin: check proof-of-stake
2047 if (pblock2->IsProofOfStake())
2049 // Limited duplicity on stake: prevents block flood attack
2050 // Duplicate stake allowed only when there is orphan child block
2051 if (setStakeSeenOrphan.count(pblock2->GetProofOfStake()) && !mapOrphanBlocksByPrev.count(hash) && !Checkpoints::WantedByPendingSyncCheckpoint(hash))
2052 return error("ProcessBlock() : duplicate proof-of-stake (%s, %d) for orphan block %s", pblock2->GetProofOfStake().first.ToString().c_str(), pblock2->GetProofOfStake().second, hash.ToString().c_str());
2054 setStakeSeenOrphan.insert(pblock2->GetProofOfStake());
2056 mapOrphanBlocks.insert(make_pair(hash, pblock2));
2057 mapOrphanBlocksByPrev.insert(make_pair(pblock2->hashPrevBlock, pblock2));
2059 // Ask this guy to fill in what we're missing
2062 pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(pblock2));
2063 // ppcoin: getblocks may not obtain the ancestor block rejected
2064 // earlier by duplicate-stake check so we ask for it again directly
2065 if (!IsInitialBlockDownload())
2066 pfrom->AskFor(CInv(MSG_BLOCK, WantedByOrphan(pblock2)));
2072 if (!pblock->AcceptBlock())
2073 return error("ProcessBlock() : AcceptBlock FAILED");
2075 // Recursively process any orphan blocks that depended on this one
2076 vector<uint256> vWorkQueue;
2077 vWorkQueue.push_back(hash);
2078 for (unsigned int i = 0; i < vWorkQueue.size(); i++)
2080 uint256 hashPrev = vWorkQueue[i];
2081 for (multimap<uint256, CBlock*>::iterator mi = mapOrphanBlocksByPrev.lower_bound(hashPrev);
2082 mi != mapOrphanBlocksByPrev.upper_bound(hashPrev);
2085 CBlock* pblockOrphan = (*mi).second;
2086 if (pblockOrphan->AcceptBlock())
2087 vWorkQueue.push_back(pblockOrphan->GetHash());
2088 mapOrphanBlocks.erase(pblockOrphan->GetHash());
2089 setStakeSeenOrphan.erase(pblockOrphan->GetProofOfStake());
2090 delete pblockOrphan;
2092 mapOrphanBlocksByPrev.erase(hashPrev);
2095 printf("ProcessBlock: ACCEPTED\n");
2097 // ppcoin: if responsible for sync-checkpoint send it
2098 if (pfrom && !CSyncCheckpoint::strMasterPrivKey.empty())
2099 Checkpoints::SendSyncCheckpoint(Checkpoints::AutoSelectSyncCheckpoint());
2104 // ppcoin: sign block
2105 bool CBlock::SignBlock(const CKeyStore& keystore)
2107 vector<valtype> vSolutions;
2108 txnouttype whichType;
2109 const CTxOut& txout = IsProofOfStake()? vtx[1].vout[1] : vtx[0].vout[0];
2111 if (!Solver(txout.scriptPubKey, whichType, vSolutions))
2113 if (whichType == TX_PUBKEY)
2116 const valtype& vchPubKey = vSolutions[0];
2118 if (!keystore.GetKey(Hash160(vchPubKey), key))
2120 if (key.GetPubKey() != vchPubKey)
2122 return key.Sign(GetHash(), vchBlockSig);
2127 // ppcoin: check block signature
2128 bool CBlock::CheckBlockSignature() const
2130 if (GetHash() == hashGenesisBlock)
2131 return vchBlockSig.empty();
2133 vector<valtype> vSolutions;
2134 txnouttype whichType;
2135 const CTxOut& txout = IsProofOfStake()? vtx[1].vout[1] : vtx[0].vout[0];
2137 if (!Solver(txout.scriptPubKey, whichType, vSolutions))
2139 if (whichType == TX_PUBKEY)
2141 const valtype& vchPubKey = vSolutions[0];
2143 if (!key.SetPubKey(vchPubKey))
2145 if (vchBlockSig.empty())
2147 return key.Verify(GetHash(), vchBlockSig);
2157 bool CheckDiskSpace(uint64 nAdditionalBytes)
2159 uint64 nFreeBytesAvailable = filesystem::space(GetDataDir()).available;
2161 // Check for 15MB because database could create another 10MB log file at any time
2162 if (nFreeBytesAvailable < (uint64)15000000 + nAdditionalBytes)
2165 string strMessage = _("Warning: Disk space is low");
2166 strMiscWarning = strMessage;
2167 printf("*** %s\n", strMessage.c_str());
2168 ThreadSafeMessageBox(strMessage, "PPCoin", wxOK | wxICON_EXCLAMATION | wxMODAL);
2175 FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode)
2179 FILE* file = fopen((GetDataDir() / strprintf("blk%04d.dat", nFile)).string().c_str(), pszMode);
2182 if (nBlockPos != 0 && !strchr(pszMode, 'a') && !strchr(pszMode, 'w'))
2184 if (fseek(file, nBlockPos, SEEK_SET) != 0)
2193 static unsigned int nCurrentBlockFile = 1;
2195 FILE* AppendBlockFile(unsigned int& nFileRet)
2200 FILE* file = OpenBlockFile(nCurrentBlockFile, 0, "ab");
2203 if (fseek(file, 0, SEEK_END) != 0)
2205 // FAT32 filesize max 4GB, fseek and ftell max 2GB, so we must stay under 2GB
2206 if (ftell(file) < 0x7F000000 - MAX_SIZE)
2208 nFileRet = nCurrentBlockFile;
2212 nCurrentBlockFile++;
2216 bool LoadBlockIndex(bool fAllowNew)
2220 hashGenesisBlock = hashGenesisBlockTestNet;
2221 bnProofOfWorkLimit = CBigNum(~uint256(0) >> 28);
2222 pchMessageStart[0] = 0xfa;
2223 pchMessageStart[1] = 0xbf;
2224 pchMessageStart[2] = 0xb5;
2225 pchMessageStart[3] = 0xda;
2232 if (!txdb.LoadBlockIndex())
2237 // Init with genesis block
2239 if (mapBlockIndex.empty())
2245 // CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
2246 // CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
2247 // CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
2248 // CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
2249 // vMerkleTree: 4a5e1e
2252 const char* pszTimestamp = "Matonis 07-AUG-2012 Parallel Currencies And The Roadmap To Monetary Freedom";
2254 txNew.nTime = 1345083810;
2255 txNew.vin.resize(1);
2256 txNew.vout.resize(1);
2257 txNew.vin[0].scriptSig = CScript() << 486604799 << CBigNum(9999) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
2258 txNew.vout[0].SetEmpty();
2260 block.vtx.push_back(txNew);
2261 block.hashPrevBlock = 0;
2262 block.hashMerkleRoot = block.BuildMerkleTree();
2264 block.nTime = 1345084287;
2265 block.nBits = bnProofOfWorkLimit.GetCompact();
2266 block.nNonce = 2179302059;
2270 block.nTime = 1345090000;
2271 block.nNonce = 122894938;
2275 printf("%s\n", block.GetHash().ToString().c_str());
2276 printf("%s\n", hashGenesisBlock.ToString().c_str());
2277 printf("%s\n", block.hashMerkleRoot.ToString().c_str());
2278 assert(block.hashMerkleRoot == uint256("0x3c2d8f85fab4d17aac558cc648a1a58acff0de6deb890c29985690052c5993c2"));
2280 assert(block.GetHash() == hashGenesisBlock);
2281 assert(block.CheckBlock());
2283 // Start new block file
2285 unsigned int nBlockPos;
2286 if (!block.WriteToDisk(nFile, nBlockPos))
2287 return error("LoadBlockIndex() : writing genesis block to disk failed");
2288 if (!block.AddToBlockIndex(nFile, nBlockPos))
2289 return error("LoadBlockIndex() : genesis block not accepted");
2291 // ppcoin: initialize synchronized checkpoint
2292 if (!Checkpoints::WriteSyncCheckpoint(hashGenesisBlock))
2293 return error("LoadBlockIndex() : failed to init sync checkpoint");
2296 // ppcoin: if checkpoint master key changed must reset sync-checkpoint
2299 string strPubKey = "";
2300 if (!txdb.ReadCheckpointPubKey(strPubKey) || strPubKey != CSyncCheckpoint::strMasterPubKey)
2302 // write checkpoint master key to db
2304 if (!txdb.WriteCheckpointPubKey(CSyncCheckpoint::strMasterPubKey))
2305 return error("LoadBlockIndex() : failed to write new checkpoint master key to db");
2306 if (!txdb.TxnCommit())
2307 return error("LoadBlockIndex() : failed to commit new checkpoint master key to db");
2308 if (!Checkpoints::ResetSyncCheckpoint())
2309 return error("LoadBlockIndex() : failed to reset sync-checkpoint");
2319 void PrintBlockTree()
2321 // precompute tree structure
2322 map<CBlockIndex*, vector<CBlockIndex*> > mapNext;
2323 for (map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
2325 CBlockIndex* pindex = (*mi).second;
2326 mapNext[pindex->pprev].push_back(pindex);
2328 //while (rand() % 3 == 0)
2329 // mapNext[pindex->pprev].push_back(pindex);
2332 vector<pair<int, CBlockIndex*> > vStack;
2333 vStack.push_back(make_pair(0, pindexGenesisBlock));
2336 while (!vStack.empty())
2338 int nCol = vStack.back().first;
2339 CBlockIndex* pindex = vStack.back().second;
2342 // print split or gap
2343 if (nCol > nPrevCol)
2345 for (int i = 0; i < nCol-1; i++)
2349 else if (nCol < nPrevCol)
2351 for (int i = 0; i < nCol; i++)
2358 for (int i = 0; i < nCol; i++)
2363 block.ReadFromDisk(pindex);
2364 printf("%d (%u,%u) %s %08lx %s tx %d",
2368 block.GetHash().ToString().substr(0,20).c_str(),
2370 DateTimeStrFormat(block.GetBlockTime()).c_str(),
2373 PrintWallets(block);
2375 // put the main timechain first
2376 vector<CBlockIndex*>& vNext = mapNext[pindex];
2377 for (unsigned int i = 0; i < vNext.size(); i++)
2379 if (vNext[i]->pnext)
2381 swap(vNext[0], vNext[i]);
2387 for (unsigned int i = 0; i < vNext.size(); i++)
2388 vStack.push_back(make_pair(nCol+i, vNext[i]));
2401 //////////////////////////////////////////////////////////////////////////////
2406 map<uint256, CAlert> mapAlerts;
2407 CCriticalSection cs_mapAlerts;
2409 static string strMintMessage = _("Info: Minting suspended due to locked wallet.");
2410 static string strMintWarning;
2412 string GetWarnings(string strFor)
2415 string strStatusBar;
2417 if (GetBoolArg("-testsafemode"))
2420 // ppcoin: wallet lock warning for minting
2421 if (strMintWarning != "")
2424 strStatusBar = strMintWarning;
2427 // Misc warnings like out of disk space and clock is wrong
2428 if (strMiscWarning != "")
2431 strStatusBar = strMiscWarning;
2434 // ppcoin: should not enter safe mode for longer invalid chain
2435 // ppcoin: if sync-checkpoint too old enter safe mode
2436 if (Checkpoints::IsMatureSyncCheckpoint())
2439 strStatusBar = strRPC = "WARNING: Checkpoint is too old. Wait for block chain to download, or notify developers of the issue.";
2442 // ppcoin: if detected invalid checkpoint enter safe mode
2443 if (Checkpoints::hashInvalidCheckpoint != 0)
2446 strStatusBar = strRPC = "WARNING: Invalid checkpoint found! Displayed transactions may not be correct! You may need to upgrade, or notify developers of the issue.";
2452 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
2454 const CAlert& alert = item.second;
2455 if (alert.AppliesToMe() && alert.nPriority > nPriority)
2457 nPriority = alert.nPriority;
2458 strStatusBar = alert.strStatusBar;
2459 if (nPriority > 1000)
2460 strRPC = strStatusBar; // ppcoin: safe mode for high alert
2465 if (strFor == "statusbar")
2466 return strStatusBar;
2467 else if (strFor == "rpc")
2469 assert(!"GetWarnings() : invalid parameter");
2473 bool CAlert::ProcessAlert()
2475 if (!CheckSignature())
2482 // Cancel previous alerts
2483 for (map<uint256, CAlert>::iterator mi = mapAlerts.begin(); mi != mapAlerts.end();)
2485 const CAlert& alert = (*mi).second;
2488 printf("cancelling alert %d\n", alert.nID);
2489 mapAlerts.erase(mi++);
2491 else if (!alert.IsInEffect())
2493 printf("expiring alert %d\n", alert.nID);
2494 mapAlerts.erase(mi++);
2500 // Check if this alert has been cancelled
2501 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
2503 const CAlert& alert = item.second;
2504 if (alert.Cancels(*this))
2506 printf("alert already cancelled by %d\n", alert.nID);
2512 mapAlerts.insert(make_pair(GetHash(), *this));
2515 printf("accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe());
2527 //////////////////////////////////////////////////////////////////////////////
2533 bool static AlreadyHave(CTxDB& txdb, const CInv& inv)
2539 bool txInMap = false;
2542 txInMap = (mempool.exists(inv.hash));
2545 mapOrphanTransactions.count(inv.hash) ||
2546 txdb.ContainsTx(inv.hash);
2550 return mapBlockIndex.count(inv.hash) ||
2551 mapOrphanBlocks.count(inv.hash);
2553 // Don't know what it is, just say we already got one
2560 // The message start string is designed to be unlikely to occur in normal data.
2561 // The characters are rarely used upper ascii, not valid as UTF-8, and produce
2562 // a large 4-byte int at any alignment.
2563 unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
2566 bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
2568 static map<CService, vector<unsigned char> > mapReuseKey;
2569 RandAddSeedPerfmon();
2571 printf("%s ", DateTimeStrFormat(GetTime()).c_str());
2572 printf("received: %s (%d bytes)\n", strCommand.c_str(), vRecv.size());
2574 if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
2576 printf("dropmessagestest DROPPING RECV MESSAGE\n");
2584 if (strCommand == "version")
2586 // Each connection can only send one version message
2587 if (pfrom->nVersion != 0)
2589 pfrom->Misbehaving(1);
2597 vRecv >> pfrom->nVersion >> pfrom->nServices >> nTime >> addrMe;
2598 if (pfrom->nVersion < MIN_PROTO_VERSION)
2600 // Since February 20, 2012, the protocol is initiated at version 209,
2601 // and earlier versions are no longer supported
2602 printf("partner %s using obsolete version %i; disconnecting\n", pfrom->addr.ToString().c_str(), pfrom->nVersion);
2603 pfrom->fDisconnect = true;
2607 if (pfrom->nVersion == 10300)
2608 pfrom->nVersion = 300;
2610 vRecv >> addrFrom >> nNonce;
2612 vRecv >> pfrom->strSubVer;
2614 vRecv >> pfrom->nStartingHeight;
2616 // Disconnect if we connected to ourself
2617 if (nNonce == nLocalHostNonce && nNonce > 1)
2619 printf("connected to self at %s, disconnecting\n", pfrom->addr.ToString().c_str());
2620 pfrom->fDisconnect = true;
2624 // ppcoin: record my external IP reported by peer
2625 if (addrFrom.IsRoutable() && addrMe.IsRoutable())
2626 addrSeenByPeer = addrMe;
2628 // Be shy and don't send version until we hear
2629 if (pfrom->fInbound)
2630 pfrom->PushVersion();
2632 pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
2634 AddTimeData(pfrom->addr, nTime);
2637 pfrom->PushMessage("verack");
2638 pfrom->vSend.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
2640 if (!pfrom->fInbound)
2642 // Advertise our address
2643 if (!fNoListen && !fUseProxy && addrLocalHost.IsRoutable() &&
2644 !IsInitialBlockDownload())
2646 CAddress addr(addrLocalHost);
2647 addr.nTime = GetAdjustedTime();
2648 pfrom->PushAddress(addr);
2651 // Get recent addresses
2652 if (pfrom->nVersion >= CADDR_TIME_VERSION || addrman.size() < 1000)
2654 pfrom->PushMessage("getaddr");
2655 pfrom->fGetAddr = true;
2657 addrman.Good(pfrom->addr);
2659 if (((CNetAddr)pfrom->addr) == (CNetAddr)addrFrom)
2661 addrman.Add(addrFrom, addrFrom);
2662 addrman.Good(addrFrom);
2666 // Ask the first connected node for block updates
2667 static int nAskedForBlocks = 0;
2668 if (!pfrom->fClient &&
2669 (pfrom->nVersion < NOBLKS_VERSION_START ||
2670 pfrom->nVersion >= NOBLKS_VERSION_END) &&
2671 (nAskedForBlocks < 1 || vNodes.size() <= 1))
2674 pfrom->PushGetBlocks(pindexBest, uint256(0));
2680 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
2681 item.second.RelayTo(pfrom);
2684 // ppcoin: relay sync-checkpoint
2686 LOCK(Checkpoints::cs_hashSyncCheckpoint);
2687 if (!Checkpoints::checkpointMessage.IsNull())
2688 Checkpoints::checkpointMessage.RelayTo(pfrom);
2691 pfrom->fSuccessfullyConnected = true;
2693 printf("version message: version %d, blocks=%d\n", pfrom->nVersion, pfrom->nStartingHeight);
2695 cPeerBlockCounts.input(pfrom->nStartingHeight);
2697 // ppcoin: ask for pending sync-checkpoint if any
2698 if (!IsInitialBlockDownload())
2699 Checkpoints::AskForPendingSyncCheckpoint(pfrom);
2703 else if (pfrom->nVersion == 0)
2705 // Must have a version message before anything else
2706 pfrom->Misbehaving(1);
2711 else if (strCommand == "verack")
2713 pfrom->vRecv.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
2717 else if (strCommand == "addr")
2719 vector<CAddress> vAddr;
2722 // Don't want addr from older versions unless seeding
2723 if (pfrom->nVersion < CADDR_TIME_VERSION && addrman.size() > 1000)
2725 if (vAddr.size() > 1000)
2727 pfrom->Misbehaving(20);
2728 return error("message addr size() = %d", vAddr.size());
2731 // Store the new addresses
2732 int64 nNow = GetAdjustedTime();
2733 int64 nSince = nNow - 10 * 60;
2734 BOOST_FOREACH(CAddress& addr, vAddr)
2738 // ignore IPv6 for now, since it isn't implemented anyway
2741 if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
2742 addr.nTime = nNow - 5 * 24 * 60 * 60;
2743 pfrom->AddAddressKnown(addr);
2744 if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
2746 // Relay to a limited number of other nodes
2749 // Use deterministic randomness to send to the same nodes for 24 hours
2750 // at a time so the setAddrKnowns of the chosen nodes prevent repeats
2751 static uint256 hashSalt;
2753 hashSalt = GetRandHash();
2754 int64 hashAddr = addr.GetHash();
2755 uint256 hashRand = hashSalt ^ (hashAddr<<32) ^ ((GetTime()+hashAddr)/(24*60*60));
2756 hashRand = Hash(BEGIN(hashRand), END(hashRand));
2757 multimap<uint256, CNode*> mapMix;
2758 BOOST_FOREACH(CNode* pnode, vNodes)
2760 if (pnode->nVersion < CADDR_TIME_VERSION)
2762 unsigned int nPointer;
2763 memcpy(&nPointer, &pnode, sizeof(nPointer));
2764 uint256 hashKey = hashRand ^ nPointer;
2765 hashKey = Hash(BEGIN(hashKey), END(hashKey));
2766 mapMix.insert(make_pair(hashKey, pnode));
2768 int nRelayNodes = 2;
2769 for (multimap<uint256, CNode*>::iterator mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
2770 ((*mi).second)->PushAddress(addr);
2774 addrman.Add(vAddr, pfrom->addr, 2 * 60 * 60);
2775 if (vAddr.size() < 1000)
2776 pfrom->fGetAddr = false;
2780 else if (strCommand == "inv")
2784 if (vInv.size() > 50000)
2786 pfrom->Misbehaving(20);
2787 return error("message inv size() = %d", vInv.size());
2790 // find last block in inv vector
2791 unsigned int nLastBlock = (unsigned int)(-1);
2792 for (unsigned int nInv = 0; nInv < vInv.size(); nInv++) {
2793 if (vInv[vInv.size() - 1 - nInv].type == MSG_BLOCK) {
2794 nLastBlock = vInv.size() - 1 - nInv;
2799 for (unsigned int nInv = 0; nInv < vInv.size(); nInv++)
2801 const CInv &inv = vInv[nInv];
2805 pfrom->AddInventoryKnown(inv);
2807 bool fAlreadyHave = AlreadyHave(txdb, inv);
2809 printf(" got inventory: %s %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new");
2813 else if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash)) {
2814 pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(mapOrphanBlocks[inv.hash]));
2815 } else if (nInv == nLastBlock) {
2816 // In case we are on a very long side-chain, it is possible that we already have
2817 // the last block in an inv bundle sent in response to getblocks. Try to detect
2818 // this situation and push another getblocks to continue.
2819 std::vector<CInv> vGetData(1,inv);
2820 pfrom->PushGetBlocks(mapBlockIndex[inv.hash], uint256(0));
2822 printf("force request: %s\n", inv.ToString().c_str());
2825 // Track requests for our stuff
2826 Inventory(inv.hash);
2831 else if (strCommand == "getdata")
2835 if (vInv.size() > 50000)
2837 pfrom->Misbehaving(20);
2838 return error("message getdata size() = %d", vInv.size());
2841 BOOST_FOREACH(const CInv& inv, vInv)
2845 printf("received getdata for: %s\n", inv.ToString().c_str());
2847 if (inv.type == MSG_BLOCK)
2849 // Send block from disk
2850 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(inv.hash);
2851 if (mi != mapBlockIndex.end())
2854 block.ReadFromDisk((*mi).second);
2855 pfrom->PushMessage("block", block);
2857 // Trigger them to send a getblocks request for the next batch of inventory
2858 if (inv.hash == pfrom->hashContinue)
2860 // Bypass PushInventory, this must send even if redundant,
2861 // and we want it right after the last block so they don't
2862 // wait for other stuff first.
2863 // ppcoin: send latest proof-of-work block to allow the
2864 // download node to accept as orphan (proof-of-stake
2865 // block might be rejected by stake connection check)
2867 vInv.push_back(CInv(MSG_BLOCK, GetLastBlockIndex(pindexBest, false)->GetBlockHash()));
2868 pfrom->PushMessage("inv", vInv);
2869 pfrom->hashContinue = 0;
2873 else if (inv.IsKnownType())
2875 // Send stream from relay memory
2878 map<CInv, CDataStream>::iterator mi = mapRelay.find(inv);
2879 if (mi != mapRelay.end())
2880 pfrom->PushMessage(inv.GetCommand(), (*mi).second);
2884 // Track requests for our stuff
2885 Inventory(inv.hash);
2890 else if (strCommand == "getblocks")
2892 CBlockLocator locator;
2894 vRecv >> locator >> hashStop;
2896 // Find the last block the caller has in the main chain
2897 CBlockIndex* pindex = locator.GetBlockIndex();
2899 // Send the rest of the chain
2901 pindex = pindex->pnext;
2902 int nLimit = 500 + locator.GetDistanceBack();
2903 unsigned int nBytes = 0;
2904 printf("getblocks %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
2905 for (; pindex; pindex = pindex->pnext)
2907 if (pindex->GetBlockHash() == hashStop)
2909 printf(" getblocks stopping at %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
2910 // ppcoin: tell downloading node about the latest block if it's
2911 // without risk being rejected due to stake connection check
2912 if (hashStop != hashBestChain && pindex->GetBlockTime() + STAKE_MIN_AGE > pindexBest->GetBlockTime())
2913 pfrom->PushInventory(CInv(MSG_BLOCK, hashBestChain));
2916 pfrom->PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash()));
2918 block.ReadFromDisk(pindex, true);
2919 nBytes += block.GetSerializeSize(SER_NETWORK, PROTOCOL_VERSION);
2920 if (--nLimit <= 0 || nBytes >= SendBufferSize()/2)
2922 // When this block is requested, we'll send an inv that'll make them
2923 // getblocks the next batch of inventory.
2924 printf(" getblocks stopping at limit %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
2925 pfrom->hashContinue = pindex->GetBlockHash();
2932 else if (strCommand == "getheaders")
2934 CBlockLocator locator;
2936 vRecv >> locator >> hashStop;
2938 CBlockIndex* pindex = NULL;
2939 if (locator.IsNull())
2941 // If locator is null, return the hashStop block
2942 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashStop);
2943 if (mi == mapBlockIndex.end())
2945 pindex = (*mi).second;
2949 // Find the last block the caller has in the main chain
2950 pindex = locator.GetBlockIndex();
2952 pindex = pindex->pnext;
2955 vector<CBlock> vHeaders;
2957 printf("getheaders %d to %s\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str());
2958 for (; pindex; pindex = pindex->pnext)
2960 vHeaders.push_back(pindex->GetBlockHeader());
2961 if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
2964 pfrom->PushMessage("headers", vHeaders);
2968 else if (strCommand == "tx")
2970 vector<uint256> vWorkQueue;
2971 vector<uint256> vEraseQueue;
2972 CDataStream vMsg(vRecv);
2977 CInv inv(MSG_TX, tx.GetHash());
2978 pfrom->AddInventoryKnown(inv);
2980 bool fMissingInputs = false;
2981 if (tx.AcceptToMemoryPool(txdb, true, &fMissingInputs))
2983 SyncWithWallets(tx, NULL, true);
2984 RelayMessage(inv, vMsg);
2985 mapAlreadyAskedFor.erase(inv);
2986 vWorkQueue.push_back(inv.hash);
2987 vEraseQueue.push_back(inv.hash);
2989 // Recursively process any orphan transactions that depended on this one
2990 for (unsigned int i = 0; i < vWorkQueue.size(); i++)
2992 uint256 hashPrev = vWorkQueue[i];
2993 for (map<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev[hashPrev].begin();
2994 mi != mapOrphanTransactionsByPrev[hashPrev].end();
2997 const CDataStream& vMsg = *((*mi).second);
2999 CDataStream(vMsg) >> tx;
3000 CInv inv(MSG_TX, tx.GetHash());
3001 bool fMissingInputs2 = false;
3003 if (tx.AcceptToMemoryPool(txdb, true, &fMissingInputs2))
3005 printf(" accepted orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
3006 SyncWithWallets(tx, NULL, true);
3007 RelayMessage(inv, vMsg);
3008 mapAlreadyAskedFor.erase(inv);
3009 vWorkQueue.push_back(inv.hash);
3010 vEraseQueue.push_back(inv.hash);
3012 else if (!fMissingInputs2)
3015 vEraseQueue.push_back(inv.hash);
3016 printf(" removed invalid orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
3021 BOOST_FOREACH(uint256 hash, vEraseQueue)
3022 EraseOrphanTx(hash);
3024 else if (fMissingInputs)
3028 // DoS prevention: do not allow mapOrphanTransactions to grow unbounded
3029 unsigned int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
3031 printf("mapOrphan overflow, removed %u tx\n", nEvicted);
3033 if (tx.nDoS) pfrom->Misbehaving(tx.nDoS);
3037 else if (strCommand == "block")
3042 printf("received block %s\n", block.GetHash().ToString().substr(0,20).c_str());
3045 CInv inv(MSG_BLOCK, block.GetHash());
3046 pfrom->AddInventoryKnown(inv);
3048 if (ProcessBlock(pfrom, &block))
3049 mapAlreadyAskedFor.erase(inv);
3050 if (block.nDoS) pfrom->Misbehaving(block.nDoS);
3054 else if (strCommand == "getaddr")
3056 pfrom->vAddrToSend.clear();
3057 vector<CAddress> vAddr = addrman.GetAddr();
3058 BOOST_FOREACH(const CAddress &addr, vAddr)
3059 pfrom->PushAddress(addr);
3063 else if (strCommand == "checkorder")
3068 if (!GetBoolArg("-allowreceivebyip"))
3070 pfrom->PushMessage("reply", hashReply, (int)2, string(""));
3077 /// we have a chance to check the order here
3079 // Keep giving the same key to the same ip until they use it
3080 if (!mapReuseKey.count(pfrom->addr))
3081 pwalletMain->GetKeyFromPool(mapReuseKey[pfrom->addr], true);
3083 // Send back approval of order and pubkey to use
3084 CScript scriptPubKey;
3085 scriptPubKey << mapReuseKey[pfrom->addr] << OP_CHECKSIG;
3086 pfrom->PushMessage("reply", hashReply, (int)0, scriptPubKey);
3090 else if (strCommand == "reply")
3095 CRequestTracker tracker;
3097 LOCK(pfrom->cs_mapRequests);
3098 map<uint256, CRequestTracker>::iterator mi = pfrom->mapRequests.find(hashReply);
3099 if (mi != pfrom->mapRequests.end())
3101 tracker = (*mi).second;
3102 pfrom->mapRequests.erase(mi);
3105 if (!tracker.IsNull())
3106 tracker.fn(tracker.param1, vRecv);
3110 else if (strCommand == "ping")
3112 if (pfrom->nVersion > BIP0031_VERSION)
3116 // Echo the message back with the nonce. This allows for two useful features:
3118 // 1) A remote node can quickly check if the connection is operational
3119 // 2) Remote nodes can measure the latency of the network thread. If this node
3120 // is overloaded it won't respond to pings quickly and the remote node can
3121 // avoid sending us more work, like chain download requests.
3123 // The nonce stops the remote getting confused between different pings: without
3124 // it, if the remote node sends a ping once per second and this node takes 5
3125 // seconds to respond to each, the 5th ping the remote sends would appear to
3126 // return very quickly.
3127 pfrom->PushMessage("pong", nonce);
3132 else if (strCommand == "alert")
3137 if (alert.ProcessAlert())
3140 pfrom->setKnown.insert(alert.GetHash());
3143 BOOST_FOREACH(CNode* pnode, vNodes)
3144 alert.RelayTo(pnode);
3149 else if (strCommand == "checkpoint")
3151 CSyncCheckpoint checkpoint;
3152 vRecv >> checkpoint;
3154 if (checkpoint.ProcessSyncCheckpoint(pfrom))
3157 pfrom->hashCheckpointKnown = checkpoint.hashCheckpoint;
3159 BOOST_FOREACH(CNode* pnode, vNodes)
3160 checkpoint.RelayTo(pnode);
3166 // Ignore unknown commands for extensibility
3170 // Update the last seen time for this node's address
3171 if (pfrom->fNetworkNode)
3172 if (strCommand == "version" || strCommand == "addr" || strCommand == "inv" || strCommand == "getdata" || strCommand == "ping")
3173 AddressCurrentlyConnected(pfrom->addr);
3179 bool ProcessMessages(CNode* pfrom)
3181 CDataStream& vRecv = pfrom->vRecv;
3185 // printf("ProcessMessages(%u bytes)\n", vRecv.size());
3189 // (4) message start
3198 // Scan for message start
3199 CDataStream::iterator pstart = search(vRecv.begin(), vRecv.end(), BEGIN(pchMessageStart), END(pchMessageStart));
3200 int nHeaderSize = vRecv.GetSerializeSize(CMessageHeader());
3201 if (vRecv.end() - pstart < nHeaderSize)
3203 if ((int)vRecv.size() > nHeaderSize)
3205 printf("\n\nPROCESSMESSAGE MESSAGESTART NOT FOUND\n\n");
3206 vRecv.erase(vRecv.begin(), vRecv.end() - nHeaderSize);
3210 if (pstart - vRecv.begin() > 0)
3211 printf("\n\nPROCESSMESSAGE SKIPPED %d BYTES\n\n", pstart - vRecv.begin());
3212 vRecv.erase(vRecv.begin(), pstart);
3215 vector<char> vHeaderSave(vRecv.begin(), vRecv.begin() + nHeaderSize);
3220 printf("\n\nPROCESSMESSAGE: ERRORS IN HEADER %s\n\n\n", hdr.GetCommand().c_str());
3223 string strCommand = hdr.GetCommand();
3226 unsigned int nMessageSize = hdr.nMessageSize;
3227 if (nMessageSize > MAX_SIZE)
3229 printf("ProcessMessages(%s, %u bytes) : nMessageSize > MAX_SIZE\n", strCommand.c_str(), nMessageSize);
3232 if (nMessageSize > vRecv.size())
3234 // Rewind and wait for rest of message
3235 vRecv.insert(vRecv.begin(), vHeaderSave.begin(), vHeaderSave.end());
3240 uint256 hash = Hash(vRecv.begin(), vRecv.begin() + nMessageSize);
3241 unsigned int nChecksum = 0;
3242 memcpy(&nChecksum, &hash, sizeof(nChecksum));
3243 if (nChecksum != hdr.nChecksum)
3245 printf("ProcessMessages(%s, %u bytes) : CHECKSUM ERROR nChecksum=%08x hdr.nChecksum=%08x\n",
3246 strCommand.c_str(), nMessageSize, nChecksum, hdr.nChecksum);
3250 // Copy message to its own buffer
3251 CDataStream vMsg(vRecv.begin(), vRecv.begin() + nMessageSize, vRecv.nType, vRecv.nVersion);
3252 vRecv.ignore(nMessageSize);
3260 fRet = ProcessMessage(pfrom, strCommand, vMsg);
3265 catch (std::ios_base::failure& e)
3267 if (strstr(e.what(), "end of data"))
3269 // Allow exceptions from underlength message on vRecv
3270 printf("ProcessMessages(%s, %u bytes) : Exception '%s' caught, normally caused by a message being shorter than its stated length\n", strCommand.c_str(), nMessageSize, e.what());
3272 else if (strstr(e.what(), "size too large"))
3274 // Allow exceptions from overlong size
3275 printf("ProcessMessages(%s, %u bytes) : Exception '%s' caught\n", strCommand.c_str(), nMessageSize, e.what());
3279 PrintExceptionContinue(&e, "ProcessMessages()");
3282 catch (std::exception& e) {
3283 PrintExceptionContinue(&e, "ProcessMessages()");
3285 PrintExceptionContinue(NULL, "ProcessMessages()");
3289 printf("ProcessMessage(%s, %u bytes) FAILED\n", strCommand.c_str(), nMessageSize);
3297 bool SendMessages(CNode* pto, bool fSendTrickle)
3299 TRY_LOCK(cs_main, lockMain);
3301 // Don't send anything until we get their version message
3302 if (pto->nVersion == 0)
3305 // Keep-alive ping. We send a nonce of zero because we don't use it anywhere
3307 if (pto->nLastSend && GetTime() - pto->nLastSend > 30 * 60 && pto->vSend.empty()) {
3309 if (pto->nVersion > BIP0031_VERSION)
3310 pto->PushMessage("ping", nonce);
3312 pto->PushMessage("ping");
3315 // Resend wallet transactions that haven't gotten in a block yet
3316 ResendWalletTransactions();
3318 // Address refresh broadcast
3319 static int64 nLastRebroadcast;
3320 if (!IsInitialBlockDownload() && (GetTime() - nLastRebroadcast > 24 * 60 * 60))
3324 BOOST_FOREACH(CNode* pnode, vNodes)
3326 // Periodically clear setAddrKnown to allow refresh broadcasts
3327 if (nLastRebroadcast)
3328 pnode->setAddrKnown.clear();
3330 // Rebroadcast our address
3331 if (!fNoListen && !fUseProxy && addrLocalHost.IsRoutable())
3333 CAddress addr(addrLocalHost);
3334 addr.nTime = GetAdjustedTime();
3335 pnode->PushAddress(addr);
3339 nLastRebroadcast = GetTime();
3347 vector<CAddress> vAddr;
3348 vAddr.reserve(pto->vAddrToSend.size());
3349 BOOST_FOREACH(const CAddress& addr, pto->vAddrToSend)
3351 // returns true if wasn't already contained in the set
3352 if (pto->setAddrKnown.insert(addr).second)
3354 vAddr.push_back(addr);
3355 // receiver rejects addr messages larger than 1000
3356 if (vAddr.size() >= 1000)
3358 pto->PushMessage("addr", vAddr);
3363 pto->vAddrToSend.clear();
3365 pto->PushMessage("addr", vAddr);
3370 // Message: inventory
3373 vector<CInv> vInvWait;
3375 LOCK(pto->cs_inventory);
3376 vInv.reserve(pto->vInventoryToSend.size());
3377 vInvWait.reserve(pto->vInventoryToSend.size());
3378 BOOST_FOREACH(const CInv& inv, pto->vInventoryToSend)
3380 if (pto->setInventoryKnown.count(inv))
3383 // trickle out tx inv to protect privacy
3384 if (inv.type == MSG_TX && !fSendTrickle)
3386 // 1/4 of tx invs blast to all immediately
3387 static uint256 hashSalt;
3389 hashSalt = GetRandHash();
3390 uint256 hashRand = inv.hash ^ hashSalt;
3391 hashRand = Hash(BEGIN(hashRand), END(hashRand));
3392 bool fTrickleWait = ((hashRand & 3) != 0);
3394 // always trickle our own transactions
3398 if (GetTransaction(inv.hash, wtx))
3400 fTrickleWait = true;
3405 vInvWait.push_back(inv);
3410 // returns true if wasn't already contained in the set
3411 if (pto->setInventoryKnown.insert(inv).second)
3413 vInv.push_back(inv);
3414 if (vInv.size() >= 1000)
3416 pto->PushMessage("inv", vInv);
3421 pto->vInventoryToSend = vInvWait;
3424 pto->PushMessage("inv", vInv);
3430 vector<CInv> vGetData;
3431 int64 nNow = GetTime() * 1000000;
3433 while (!pto->mapAskFor.empty() && (*pto->mapAskFor.begin()).first <= nNow)
3435 const CInv& inv = (*pto->mapAskFor.begin()).second;
3436 if (!AlreadyHave(txdb, inv))
3438 printf("sending getdata: %s\n", inv.ToString().c_str());
3439 vGetData.push_back(inv);
3440 if (vGetData.size() >= 1000)
3442 pto->PushMessage("getdata", vGetData);
3446 mapAlreadyAskedFor[inv] = nNow;
3447 pto->mapAskFor.erase(pto->mapAskFor.begin());
3449 if (!vGetData.empty())
3450 pto->PushMessage("getdata", vGetData);
3469 //////////////////////////////////////////////////////////////////////////////
3474 int static FormatHashBlocks(void* pbuffer, unsigned int len)
3476 unsigned char* pdata = (unsigned char*)pbuffer;
3477 unsigned int blocks = 1 + ((len + 8) / 64);
3478 unsigned char* pend = pdata + 64 * blocks;
3479 memset(pdata + len, 0, 64 * blocks - len);
3481 unsigned int bits = len * 8;
3482 pend[-1] = (bits >> 0) & 0xff;
3483 pend[-2] = (bits >> 8) & 0xff;
3484 pend[-3] = (bits >> 16) & 0xff;
3485 pend[-4] = (bits >> 24) & 0xff;
3489 static const unsigned int pSHA256InitState[8] =
3490 {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
3492 void SHA256Transform(void* pstate, void* pinput, const void* pinit)
3495 unsigned char data[64];
3499 for (int i = 0; i < 16; i++)
3500 ((uint32_t*)data)[i] = ByteReverse(((uint32_t*)pinput)[i]);
3502 for (int i = 0; i < 8; i++)
3503 ctx.h[i] = ((uint32_t*)pinit)[i];
3505 SHA256_Update(&ctx, data, sizeof(data));
3506 for (int i = 0; i < 8; i++)
3507 ((uint32_t*)pstate)[i] = ctx.h[i];
3511 // ScanHash scans nonces looking for a hash with at least some zero bits.
3512 // It operates on big endian data. Caller does the byte reversing.
3513 // All input buffers are 16-byte aligned. nNonce is usually preserved
3514 // between calls, but periodically or if nNonce is 0xffff0000 or above,
3515 // the block is rebuilt and nNonce starts over at zero.
3517 unsigned int static ScanHash_CryptoPP(char* pmidstate, char* pdata, char* phash1, char* phash, unsigned int& nHashesDone)
3519 unsigned int& nNonce = *(unsigned int*)(pdata + 12);
3523 // Hash pdata using pmidstate as the starting state into
3524 // preformatted buffer phash1, then hash phash1 into phash
3526 SHA256Transform(phash1, pdata, pmidstate);
3527 SHA256Transform(phash, phash1, pSHA256InitState);
3529 // Return the nonce if the hash has at least some zero bits,
3530 // caller will check if it has enough to reach the target
3531 if (((unsigned short*)phash)[14] == 0)
3534 // If nothing found after trying for a while, return -1
3535 if ((nNonce & 0xffff) == 0)
3537 nHashesDone = 0xffff+1;
3538 return (unsigned int) -1;
3543 // Some explaining would be appreciated
3548 set<uint256> setDependsOn;
3551 COrphan(CTransaction* ptxIn)
3559 printf("COrphan(hash=%s, dPriority=%.1f)\n", ptx->GetHash().ToString().substr(0,10).c_str(), dPriority);
3560 BOOST_FOREACH(uint256 hash, setDependsOn)
3561 printf(" setDependsOn %s\n", hash.ToString().substr(0,10).c_str());
3566 uint64 nLastBlockTx = 0;
3567 uint64 nLastBlockSize = 0;
3570 // fProofOfStake: try (best effort) to make a proof-of-stake block
3571 CBlock* CreateNewBlock(CWallet* pwallet, bool fProofOfStake)
3573 CReserveKey reservekey(pwallet);
3576 auto_ptr<CBlock> pblock(new CBlock());
3580 // Create coinbase tx
3582 txNew.vin.resize(1);
3583 txNew.vin[0].prevout.SetNull();
3584 txNew.vout.resize(1);
3585 txNew.vout[0].scriptPubKey << reservekey.GetReservedKey() << OP_CHECKSIG;
3587 // Add our coinbase tx as first transaction
3588 pblock->vtx.push_back(txNew);
3590 // ppcoin: if coinstake available add coinstake tx
3591 static unsigned int nLastCoinStakeCheckTime = GetAdjustedTime() - nMaxClockDrift / 2; // only initialized at startup
3592 CBlockIndex* pindexPrev = pindexBest;
3594 if (fProofOfStake) // attemp to find a coinstake
3596 while (nLastCoinStakeCheckTime < GetAdjustedTime())
3598 pindexPrev = pindexBest; // get best block again to avoid getting stale
3599 pblock->nBits = GetNextTargetRequired(pindexPrev, true);
3600 CTransaction txCoinStake;
3602 static CCriticalSection cs;
3604 // mining may have been suspended for a while so
3605 // need to take max to satisfy the timestamp protocol
3606 nLastCoinStakeCheckTime++;
3607 nLastCoinStakeCheckTime = max(nLastCoinStakeCheckTime, (unsigned int) (GetAdjustedTime() - nMaxClockDrift / 2));
3608 txCoinStake.nTime = nLastCoinStakeCheckTime;
3610 if (pwallet->CreateCoinStake(pblock->nBits, txCoinStake))
3612 pblock->vtx.push_back(txCoinStake);
3613 pblock->vtx[0].vout[0].SetEmpty();
3619 pblock->nBits = GetNextTargetRequired(pindexPrev, pblock->IsProofOfStake());
3621 // Collect memory pool transactions into the block
3624 LOCK2(cs_main, mempool.cs);
3627 // Priority order to process transactions
3628 list<COrphan> vOrphan; // list memory doesn't move
3629 map<uint256, vector<COrphan*> > mapDependers;
3630 multimap<double, CTransaction*> mapPriority;
3631 for (map<uint256, CTransaction>::iterator mi = mempool.mapTx.begin(); mi != mempool.mapTx.end(); ++mi)
3633 CTransaction& tx = (*mi).second;
3634 if (tx.IsCoinBase() || tx.IsCoinStake() || !tx.IsFinal())
3637 COrphan* porphan = NULL;
3638 double dPriority = 0;
3639 BOOST_FOREACH(const CTxIn& txin, tx.vin)
3641 // Read prev transaction
3642 CTransaction txPrev;
3644 if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
3646 // Has to wait for dependencies
3649 // Use list for automatic deletion
3650 vOrphan.push_back(COrphan(&tx));
3651 porphan = &vOrphan.back();
3653 mapDependers[txin.prevout.hash].push_back(porphan);
3654 porphan->setDependsOn.insert(txin.prevout.hash);
3657 int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
3659 // Read block header
3660 int nConf = txindex.GetDepthInMainChain();
3662 dPriority += (double)nValueIn * nConf;
3664 if (fDebug && GetBoolArg("-printpriority"))
3665 printf("priority nValueIn=%-12"PRI64d" nConf=%-5d dPriority=%-20.1f\n", nValueIn, nConf, dPriority);
3668 // Priority is sum(valuein * age) / txsize
3669 dPriority /= ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
3672 porphan->dPriority = dPriority;
3674 mapPriority.insert(make_pair(-dPriority, &(*mi).second));
3676 if (fDebug && GetBoolArg("-printpriority"))
3678 printf("priority %-20.1f %s\n%s", dPriority, tx.GetHash().ToString().substr(0,10).c_str(), tx.ToString().c_str());
3685 // Collect transactions into block
3686 map<uint256, CTxIndex> mapTestPool;
3687 uint64 nBlockSize = 1000;
3688 uint64 nBlockTx = 0;
3689 int nBlockSigOps = 100;
3690 while (!mapPriority.empty())
3692 // Take highest priority transaction off priority queue
3693 CTransaction& tx = *(*mapPriority.begin()).second;
3694 mapPriority.erase(mapPriority.begin());
3697 unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
3698 if (nBlockSize + nTxSize >= MAX_BLOCK_SIZE_GEN)
3701 // Legacy limits on sigOps:
3702 unsigned int nTxSigOps = tx.GetLegacySigOpCount();
3703 if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
3707 if (tx.nTime > GetAdjustedTime())
3710 // ppcoin: simplify transaction fee - allow free = false
3711 int64 nMinFee = tx.GetMinFee(nBlockSize, false, GMF_BLOCK);
3713 // Connecting shouldn't fail due to dependency on other memory pool transactions
3714 // because we're already processing them in order of dependency
3715 map<uint256, CTxIndex> mapTestPoolTmp(mapTestPool);
3716 MapPrevTx mapInputs;
3718 if (!tx.FetchInputs(txdb, mapTestPoolTmp, false, true, mapInputs, fInvalid))
3721 int64 nTxFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
3722 if (nTxFees < nMinFee)
3725 nTxSigOps += tx.GetP2SHSigOpCount(mapInputs);
3726 if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
3729 if (!tx.ConnectInputs(txdb, mapInputs, mapTestPoolTmp, CDiskTxPos(1,1,1), pindexPrev, false, true))
3731 mapTestPoolTmp[tx.GetHash()] = CTxIndex(CDiskTxPos(1,1,1), tx.vout.size());
3732 swap(mapTestPool, mapTestPoolTmp);
3735 pblock->vtx.push_back(tx);
3736 nBlockSize += nTxSize;
3738 nBlockSigOps += nTxSigOps;
3741 // Add transactions that depend on this one to the priority queue
3742 uint256 hash = tx.GetHash();
3743 if (mapDependers.count(hash))
3745 BOOST_FOREACH(COrphan* porphan, mapDependers[hash])
3747 if (!porphan->setDependsOn.empty())
3749 porphan->setDependsOn.erase(hash);
3750 if (porphan->setDependsOn.empty())
3751 mapPriority.insert(make_pair(-porphan->dPriority, porphan->ptx));
3757 nLastBlockTx = nBlockTx;
3758 nLastBlockSize = nBlockSize;
3759 if (fDebug && GetBoolArg("-printpriority"))
3760 printf("CreateNewBlock(): total size %lu\n", nBlockSize);
3763 if (pblock->IsProofOfWork())
3764 pblock->vtx[0].vout[0].nValue = GetProofOfWorkReward(pblock->nBits);
3767 pblock->hashPrevBlock = pindexPrev->GetBlockHash();
3768 pblock->hashMerkleRoot = pblock->BuildMerkleTree();
3769 pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, pblock->GetMaxTransactionTime());
3770 pblock->nTime = max(pblock->GetBlockTime(), pindexPrev->GetBlockTime() - nMaxClockDrift);
3771 pblock->UpdateTime(pindexPrev);
3774 return pblock.release();
3778 void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce)
3780 // Update nExtraNonce
3781 static uint256 hashPrevBlock;
3782 if (hashPrevBlock != pblock->hashPrevBlock)
3785 hashPrevBlock = pblock->hashPrevBlock;
3788 pblock->vtx[0].vin[0].scriptSig = (CScript() << pblock->nTime << CBigNum(nExtraNonce)) + COINBASE_FLAGS;
3789 assert(pblock->vtx[0].vin[0].scriptSig.size() <= 100);
3791 pblock->hashMerkleRoot = pblock->BuildMerkleTree();
3795 void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1)
3798 // Prebuild hash buffers
3805 uint256 hashPrevBlock;
3806 uint256 hashMerkleRoot;
3809 unsigned int nNonce;
3812 unsigned char pchPadding0[64];
3814 unsigned char pchPadding1[64];
3817 memset(&tmp, 0, sizeof(tmp));
3819 tmp.block.nVersion = pblock->nVersion;
3820 tmp.block.hashPrevBlock = pblock->hashPrevBlock;
3821 tmp.block.hashMerkleRoot = pblock->hashMerkleRoot;
3822 tmp.block.nTime = pblock->nTime;
3823 tmp.block.nBits = pblock->nBits;
3824 tmp.block.nNonce = pblock->nNonce;
3826 FormatHashBlocks(&tmp.block, sizeof(tmp.block));
3827 FormatHashBlocks(&tmp.hash1, sizeof(tmp.hash1));
3829 // Byte swap all the input buffer
3830 for (unsigned int i = 0; i < sizeof(tmp)/4; i++)
3831 ((unsigned int*)&tmp)[i] = ByteReverse(((unsigned int*)&tmp)[i]);
3833 // Precalc the first half of the first hash, which stays constant
3834 SHA256Transform(pmidstate, &tmp.block, pSHA256InitState);
3836 memcpy(pdata, &tmp.block, 128);
3837 memcpy(phash1, &tmp.hash1, 64);
3841 bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
3843 uint256 hash = pblock->GetHash();
3844 uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
3846 if (hash > hashTarget && pblock->IsProofOfWork())
3847 return error("BitcoinMiner : proof-of-work not meeting target");
3850 printf("BitcoinMiner:\n");
3851 printf("new block found \n hash: %s \ntarget: %s\n", hash.GetHex().c_str(), hashTarget.GetHex().c_str());
3853 printf("%s ", DateTimeStrFormat(GetTime()).c_str());
3854 printf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue).c_str());
3859 if (pblock->hashPrevBlock != hashBestChain)
3860 return error("BitcoinMiner : generated block is stale");
3862 // Remove key from key pool
3863 reservekey.KeepKey();
3865 // Track how many getdata requests this block gets
3867 LOCK(wallet.cs_wallet);
3868 wallet.mapRequestCount[pblock->GetHash()] = 0;
3871 // Process this block the same as if we had received it from another node
3872 if (!ProcessBlock(NULL, pblock))
3873 return error("BitcoinMiner : ProcessBlock, block not accepted");
3879 void static ThreadBitcoinMiner(void* parg);
3881 static bool fGenerateBitcoins = false;
3882 static bool fLimitProcessors = false;
3883 static int nLimitProcessors = -1;
3885 void BitcoinMiner(CWallet *pwallet, bool fProofOfStake)
3887 printf("CPUMiner started for proof-of-%s\n", fProofOfStake? "stake" : "work");
3888 SetThreadPriority(THREAD_PRIORITY_LOWEST);
3890 // Each thread has its own key and counter
3891 CReserveKey reservekey(pwallet);
3892 unsigned int nExtraNonce = 0;
3894 while (fGenerateBitcoins || fProofOfStake)
3898 while (vNodes.empty() || IsInitialBlockDownload())
3903 if ((!fGenerateBitcoins) && !fProofOfStake)
3907 while (pwallet->IsLocked())
3909 strMintWarning = strMintMessage;
3912 strMintWarning = "";
3917 unsigned int nTransactionsUpdatedLast = nTransactionsUpdated;
3918 CBlockIndex* pindexPrev = pindexBest;
3920 auto_ptr<CBlock> pblock(CreateNewBlock(pwallet, fProofOfStake));
3924 IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce);
3926 // ppcoin: if proof-of-stake block found then process block
3929 if (pblock->IsProofOfStake())
3931 if (!pblock->SignBlock(*pwalletMain))
3933 strMintWarning = strMintMessage;
3936 strMintWarning = "";
3937 printf("CPUMiner : proof-of-stake block found %s\n", pblock->GetHash().ToString().c_str());
3938 SetThreadPriority(THREAD_PRIORITY_NORMAL);
3939 CheckWork(pblock.get(), *pwalletMain, reservekey);
3940 SetThreadPriority(THREAD_PRIORITY_LOWEST);
3946 printf("Running BitcoinMiner with %d transactions in block\n", pblock->vtx.size());
3950 // Prebuild hash buffers
3952 char pmidstatebuf[32+16]; char* pmidstate = alignup<16>(pmidstatebuf);
3953 char pdatabuf[128+16]; char* pdata = alignup<16>(pdatabuf);
3954 char phash1buf[64+16]; char* phash1 = alignup<16>(phash1buf);
3956 FormatHashBuffers(pblock.get(), pmidstate, pdata, phash1);
3958 unsigned int& nBlockTime = *(unsigned int*)(pdata + 64 + 4);
3959 unsigned int& nBlockNonce = *(unsigned int*)(pdata + 64 + 12);
3965 int64 nStart = GetTime();
3966 uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
3968 uint256& hash = *alignup<16>(hashbuf);
3971 unsigned int nHashesDone = 0;
3972 unsigned int nNonceFound;
3975 nNonceFound = ScanHash_CryptoPP(pmidstate, pdata + 64, phash1,
3976 (char*)&hash, nHashesDone);
3978 // Check if something found
3979 if (nNonceFound != (unsigned int) -1)
3981 for (unsigned int i = 0; i < sizeof(hash)/4; i++)
3982 ((unsigned int*)&hash)[i] = ByteReverse(((unsigned int*)&hash)[i]);
3984 if (hash <= hashTarget)
3987 pblock->nNonce = ByteReverse(nNonceFound);
3988 assert(hash == pblock->GetHash());
3989 if (!pblock->SignBlock(*pwalletMain))
3991 strMintWarning = strMintMessage;
3994 strMintWarning = "";
3995 SetThreadPriority(THREAD_PRIORITY_NORMAL);
3996 CheckWork(pblock.get(), *pwalletMain, reservekey);
3997 SetThreadPriority(THREAD_PRIORITY_LOWEST);
4003 static int64 nHashCounter;
4004 if (nHPSTimerStart == 0)
4006 nHPSTimerStart = GetTimeMillis();
4010 nHashCounter += nHashesDone;
4011 if (GetTimeMillis() - nHPSTimerStart > 4000)
4013 static CCriticalSection cs;
4016 if (GetTimeMillis() - nHPSTimerStart > 4000)
4018 dHashesPerSec = 1000.0 * nHashCounter / (GetTimeMillis() - nHPSTimerStart);
4019 nHPSTimerStart = GetTimeMillis();
4021 static int64 nLogTime;
4022 if (GetTime() - nLogTime > 30 * 60)
4024 nLogTime = GetTime();
4025 printf("%s ", DateTimeStrFormat(GetTime()).c_str());
4026 printf("hashmeter %3d CPUs %6.0f khash/s\n", vnThreadsRunning[THREAD_MINER], dHashesPerSec/1000.0);
4032 // Check for stop or if block needs to be rebuilt
4035 if (!fGenerateBitcoins)
4037 if (fLimitProcessors && vnThreadsRunning[THREAD_MINER] > nLimitProcessors)
4041 if (nBlockNonce >= 0xffff0000)
4043 if (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 60)
4045 if (pindexPrev != pindexBest)
4048 // Update nTime every few seconds
4049 pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, pblock->GetMaxTransactionTime());
4050 pblock->nTime = max(pblock->GetBlockTime(), pindexPrev->GetBlockTime() - nMaxClockDrift);
4051 pblock->UpdateTime(pindexPrev);
4052 nBlockTime = ByteReverse(pblock->nTime);
4053 if (pblock->GetBlockTime() >= (int64)pblock->vtx[0].nTime + nMaxClockDrift)
4054 break; // need to update coinbase timestamp
4059 void static ThreadBitcoinMiner(void* parg)
4061 CWallet* pwallet = (CWallet*)parg;
4064 vnThreadsRunning[THREAD_MINER]++;
4065 BitcoinMiner(pwallet, false);
4066 vnThreadsRunning[THREAD_MINER]--;
4068 catch (std::exception& e) {
4069 vnThreadsRunning[THREAD_MINER]--;
4070 PrintException(&e, "ThreadBitcoinMiner()");
4072 vnThreadsRunning[THREAD_MINER]--;
4073 PrintException(NULL, "ThreadBitcoinMiner()");
4076 if (vnThreadsRunning[THREAD_MINER] == 0)
4078 printf("ThreadBitcoinMiner exiting, %d threads remaining\n", vnThreadsRunning[THREAD_MINER]);
4082 void GenerateBitcoins(bool fGenerate, CWallet* pwallet)
4084 fGenerateBitcoins = fGenerate;
4085 nLimitProcessors = GetArg("-genproclimit", -1);
4086 if (nLimitProcessors == 0)
4087 fGenerateBitcoins = false;
4088 fLimitProcessors = (nLimitProcessors != -1);
4092 int nProcessors = boost::thread::hardware_concurrency();
4093 printf("%d processors\n", nProcessors);
4094 if (nProcessors < 1)
4096 if (fLimitProcessors && nProcessors > nLimitProcessors)
4097 nProcessors = nLimitProcessors;
4098 int nAddThreads = nProcessors - vnThreadsRunning[THREAD_MINER];
4099 printf("Starting %d BitcoinMiner threads\n", nAddThreads);
4100 for (int i = 0; i < nAddThreads; i++)
4102 if (!CreateThread(ThreadBitcoinMiner, pwallet))
4103 printf("Error: CreateThread(ThreadBitcoinMiner) failed\n");