1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2012 The Bitcoin developers
3 // Distributed under the MIT/X11 software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
7 #include "checkpoints.h"
12 #include "ui_interface.h"
14 #include "zerocoin/Zerocoin.h"
15 #include <boost/algorithm/string/replace.hpp>
16 #include <boost/filesystem.hpp>
17 #include <boost/filesystem/fstream.hpp>
21 using namespace boost;
27 CCriticalSection cs_setpwalletRegistered;
28 set<CWallet*> setpwalletRegistered;
30 CCriticalSection cs_main;
33 unsigned int nTransactionsUpdated = 0;
35 map<uint256, CBlockIndex*> mapBlockIndex;
36 set<pair<COutPoint, unsigned int> > setStakeSeen;
37 libzerocoin::Params* ZCParams;
39 CBigNum bnProofOfWorkLimit(~uint256(0) >> 20); // "standard" scrypt target limit for proof of work, results with 0,000244140625 proof-of-work difficulty
40 CBigNum bnProofOfStakeLegacyLimit(~uint256(0) >> 24); // proof of stake target limit from block #15000 and until 20 June 2013, results with 0,00390625 proof of stake difficulty
41 CBigNum bnProofOfStakeLimit(~uint256(0) >> 27); // proof of stake target limit since 20 June 2013, equal to 0.03125 proof of stake difficulty
42 CBigNum bnProofOfStakeHardLimit(~uint256(0) >> 30); // disabled temporarily, will be used in the future to fix minimal proof of stake difficulty at 0.25
43 uint256 nPoWBase = uint256("0x00000000ffff0000000000000000000000000000000000000000000000000000"); // difficulty-1 target
45 CBigNum bnProofOfWorkLimitTestNet(~uint256(0) >> 16);
47 unsigned int nStakeMinAge = 60 * 60 * 24 * 30; // 30 days as minimum age for coin age
48 unsigned int nStakeMaxAge = 60 * 60 * 24 * 90; // 90 days as stake age of full weight
49 unsigned int nStakeTargetSpacing = 10 * 60; // 10-minute stakes spacing
50 unsigned int nModifierInterval = 6 * 60 * 60; // time to elapse before new modifier is computed
52 int nCoinbaseMaturity = 500;
53 CBlockIndex* pindexGenesisBlock = NULL;
56 uint256 nBestChainTrust = 0;
57 uint256 nBestInvalidTrust = 0;
59 uint256 hashBestChain = 0;
60 CBlockIndex* pindexBest = NULL;
61 int64 nTimeBestReceived = 0;
63 CMedianFilter<int> cPeerBlockCounts(5, 0); // Amount of blocks that other nodes claim to have
65 map<uint256, CBlock*> mapOrphanBlocks;
66 multimap<uint256, CBlock*> mapOrphanBlocksByPrev;
67 set<pair<COutPoint, unsigned int> > setStakeSeenOrphan;
68 map<uint256, uint256> mapProofOfStake;
70 map<uint256, CTransaction> mapOrphanTransactions;
71 map<uint256, set<uint256> > mapOrphanTransactionsByPrev;
73 // Constant stuff for coinbase transactions we create:
74 CScript COINBASE_FLAGS;
76 const string strMessageMagic = "NovaCoin Signed Message:\n";
79 int64 nTransactionFee = MIN_TX_FEE;
80 bool fStakeUsePooledKeys = false;
81 extern enum Checkpoints::CPMode CheckpointsMode;
83 //////////////////////////////////////////////////////////////////////////////
85 // dispatching functions
88 // These functions dispatch to one or all registered wallets
91 void RegisterWallet(CWallet* pwalletIn)
94 LOCK(cs_setpwalletRegistered);
95 setpwalletRegistered.insert(pwalletIn);
99 void UnregisterWallet(CWallet* pwalletIn)
102 LOCK(cs_setpwalletRegistered);
103 setpwalletRegistered.erase(pwalletIn);
107 // check whether the passed transaction is from us
108 bool static IsFromMe(CTransaction& tx)
110 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
111 if (pwallet->IsFromMe(tx))
116 // get the wallet transaction with the given hash (if it exists)
117 bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
119 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
120 if (pwallet->GetTransaction(hashTx,wtx))
125 // erases transaction with the given hash from all wallets
126 void static EraseFromWallets(uint256 hash)
128 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
129 pwallet->EraseFromWallet(hash);
132 // make sure all wallets know about the given transaction, in the given block
133 void SyncWithWallets(const CTransaction& tx, const CBlock* pblock, bool fUpdate, bool fConnect)
137 // ppcoin: wallets need to refund inputs when disconnecting coinstake
138 if (tx.IsCoinStake())
140 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
141 if (pwallet->IsFromMe(tx))
142 pwallet->DisableTransaction(tx);
147 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
148 pwallet->AddToWalletIfInvolvingMe(tx, pblock, fUpdate);
151 // notify wallets about a new best chain
152 void static SetBestChain(const CBlockLocator& loc)
154 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
155 pwallet->SetBestChain(loc);
158 // notify wallets about an updated transaction
159 void static UpdatedTransaction(const uint256& hashTx)
161 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
162 pwallet->UpdatedTransaction(hashTx);
166 void static PrintWallets(const CBlock& block)
168 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
169 pwallet->PrintWallet(block);
172 // notify wallets about an incoming inventory (for request counts)
173 void static Inventory(const uint256& hash)
175 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
176 pwallet->Inventory(hash);
179 // ask wallets to resend their transactions
180 void ResendWalletTransactions()
182 BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
183 pwallet->ResendWalletTransactions();
192 //////////////////////////////////////////////////////////////////////////////
194 // mapOrphanTransactions
197 bool AddOrphanTx(const CTransaction& tx)
199 uint256 hash = tx.GetHash();
200 if (mapOrphanTransactions.count(hash))
203 // Ignore big transactions, to avoid a
204 // send-big-orphans memory exhaustion attack. If a peer has a legitimate
205 // large transaction with a missing parent then we assume
206 // it will rebroadcast it later, after the parent transaction(s)
207 // have been mined or received.
208 // 10,000 orphans, each of which is at most 5,000 bytes big is
209 // at most 500 megabytes of orphans:
211 size_t nSize = tx.GetSerializeSize(SER_NETWORK, CTransaction::CURRENT_VERSION);
215 printf("ignoring large orphan tx (size: %"PRIszu", hash: %s)\n", nSize, hash.ToString().substr(0,10).c_str());
219 mapOrphanTransactions[hash] = tx;
220 BOOST_FOREACH(const CTxIn& txin, tx.vin)
221 mapOrphanTransactionsByPrev[txin.prevout.hash].insert(hash);
223 printf("stored orphan tx %s (mapsz %"PRIszu")\n", hash.ToString().substr(0,10).c_str(),
224 mapOrphanTransactions.size());
228 void static EraseOrphanTx(uint256 hash)
230 if (!mapOrphanTransactions.count(hash))
232 const CTransaction& tx = mapOrphanTransactions[hash];
233 BOOST_FOREACH(const CTxIn& txin, tx.vin)
235 mapOrphanTransactionsByPrev[txin.prevout.hash].erase(hash);
236 if (mapOrphanTransactionsByPrev[txin.prevout.hash].empty())
237 mapOrphanTransactionsByPrev.erase(txin.prevout.hash);
239 mapOrphanTransactions.erase(hash);
242 unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
244 unsigned int nEvicted = 0;
245 while (mapOrphanTransactions.size() > nMaxOrphans)
247 // Evict a random orphan:
248 uint256 randomhash = GetRandHash();
249 map<uint256, CTransaction>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
250 if (it == mapOrphanTransactions.end())
251 it = mapOrphanTransactions.begin();
252 EraseOrphanTx(it->first);
264 //////////////////////////////////////////////////////////////////////////////
266 // CTransaction and CTxIndex
269 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet)
272 if (!txdb.ReadTxIndex(prevout.hash, txindexRet))
274 if (!ReadFromDisk(txindexRet.pos))
276 if (prevout.n >= vout.size())
284 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout)
287 return ReadFromDisk(txdb, prevout, txindex);
290 bool CTransaction::ReadFromDisk(COutPoint prevout)
294 return ReadFromDisk(txdb, prevout, txindex);
297 bool CTransaction::IsStandard() const
299 if (nVersion > CTransaction::CURRENT_VERSION)
302 BOOST_FOREACH(const CTxIn& txin, vin)
304 // Biggest 'standard' txin is a 3-signature 3-of-3 CHECKMULTISIG
305 // pay-to-script-hash, which is 3 ~80-byte signatures, 3
306 // ~65-byte public keys, plus a few script ops.
307 if (txin.scriptSig.size() > 500)
309 if (!txin.scriptSig.IsPushOnly())
312 BOOST_FOREACH(const CTxOut& txout, vout) {
313 if (!::IsStandard(txout.scriptPubKey))
315 if (txout.nValue == 0)
322 // Check transaction inputs, and make sure any
323 // pay-to-script-hash transactions are evaluating IsStandard scripts
325 // Why bother? To avoid denial-of-service attacks; an attacker
326 // can submit a standard HASH... OP_EQUAL transaction,
327 // which will get accepted into blocks. The redemption
328 // script can be anything; an attacker could use a very
329 // expensive-to-check-upon-redemption script like:
330 // DUP CHECKSIG DROP ... repeated 100 times... OP_1
332 bool CTransaction::AreInputsStandard(const MapPrevTx& mapInputs) const
335 return true; // Coinbases don't use vin normally
337 for (unsigned int i = 0; i < vin.size(); i++)
339 const CTxOut& prev = GetOutputFor(vin[i], mapInputs);
341 vector<vector<unsigned char> > vSolutions;
342 txnouttype whichType;
343 // get the scriptPubKey corresponding to this input:
344 const CScript& prevScript = prev.scriptPubKey;
345 if (!Solver(prevScript, whichType, vSolutions))
347 int nArgsExpected = ScriptSigArgsExpected(whichType, vSolutions);
348 if (nArgsExpected < 0)
351 // Transactions with extra stuff in their scriptSigs are
352 // non-standard. Note that this EvalScript() call will
353 // be quick, because if there are any operations
354 // beside "push data" in the scriptSig the
355 // IsStandard() call returns false
356 vector<vector<unsigned char> > stack;
357 if (!EvalScript(stack, vin[i].scriptSig, *this, i, 0))
360 if (whichType == TX_SCRIPTHASH)
364 CScript subscript(stack.back().begin(), stack.back().end());
365 vector<vector<unsigned char> > vSolutions2;
366 txnouttype whichType2;
367 if (!Solver(subscript, whichType2, vSolutions2))
369 if (whichType2 == TX_SCRIPTHASH)
373 tmpExpected = ScriptSigArgsExpected(whichType2, vSolutions2);
376 nArgsExpected += tmpExpected;
379 if (stack.size() != (unsigned int)nArgsExpected)
387 CTransaction::GetLegacySigOpCount() const
389 unsigned int nSigOps = 0;
390 BOOST_FOREACH(const CTxIn& txin, vin)
392 nSigOps += txin.scriptSig.GetSigOpCount(false);
394 BOOST_FOREACH(const CTxOut& txout, vout)
396 nSigOps += txout.scriptPubKey.GetSigOpCount(false);
402 int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
414 // Load the block this tx is in
416 if (!CTxDB("r").ReadTxIndex(GetHash(), txindex))
418 if (!blockTmp.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos))
423 // Update the tx's hashBlock
424 hashBlock = pblock->GetHash();
426 // Locate the transaction
427 for (nIndex = 0; nIndex < (int)pblock->vtx.size(); nIndex++)
428 if (pblock->vtx[nIndex] == *(CTransaction*)this)
430 if (nIndex == (int)pblock->vtx.size())
432 vMerkleBranch.clear();
434 printf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
438 // Fill in merkle branch
439 vMerkleBranch = pblock->GetMerkleBranch(nIndex);
442 // Is the tx in a block that's in the main chain
443 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
444 if (mi == mapBlockIndex.end())
446 CBlockIndex* pindex = (*mi).second;
447 if (!pindex || !pindex->IsInMainChain())
450 return pindexBest->nHeight - pindex->nHeight + 1;
459 bool CTransaction::CheckTransaction() const
461 // Basic checks that don't depend on any context
463 return DoS(10, error("CTransaction::CheckTransaction() : vin empty"));
465 return DoS(10, error("CTransaction::CheckTransaction() : vout empty"));
467 if (::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
468 return DoS(100, error("CTransaction::CheckTransaction() : size limits failed"));
470 // Check for negative or overflow output values
472 for (unsigned int i = 0; i < vout.size(); i++)
474 const CTxOut& txout = vout[i];
475 if (txout.IsEmpty() && !IsCoinBase() && !IsCoinStake())
476 return DoS(100, error("CTransaction::CheckTransaction() : txout empty for user transaction"));
478 // NovaCoin: enforce minimum output amount for user transactions
479 if (!IsCoinBase() && !txout.IsEmpty() && txout.nValue < MIN_TXOUT_AMOUNT)
480 return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue below minimum"));
482 if (txout.nValue > MAX_MONEY)
483 return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue too high"));
484 nValueOut += txout.nValue;
485 if (!MoneyRange(nValueOut))
486 return DoS(100, error("CTransaction::CheckTransaction() : txout total out of range"));
489 // Check for duplicate inputs
490 set<COutPoint> vInOutPoints;
491 BOOST_FOREACH(const CTxIn& txin, vin)
493 if (vInOutPoints.count(txin.prevout))
495 vInOutPoints.insert(txin.prevout);
500 if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
501 return DoS(100, error("CTransaction::CheckTransaction() : coinbase script size is invalid"));
505 BOOST_FOREACH(const CTxIn& txin, vin)
506 if (txin.prevout.IsNull())
507 return DoS(10, error("CTransaction::CheckTransaction() : prevout is null"));
513 int64 CTransaction::GetMinFee(unsigned int nBlockSize, bool fAllowFree,
514 enum GetMinFee_mode mode, unsigned int nBytes) const
516 // Base fee is either MIN_TX_FEE or MIN_RELAY_TX_FEE
517 int64 nBaseFee = (mode == GMF_RELAY) ? MIN_RELAY_TX_FEE : MIN_TX_FEE;
519 unsigned int nNewBlockSize = nBlockSize + nBytes;
520 int64 nMinFee = (1 + (int64)nBytes / 1000) * nBaseFee;
522 // To limit dust spam, require MIN_TX_FEE/MIN_RELAY_TX_FEE if any output is less than 0.01
523 if (nMinFee < nBaseFee)
525 BOOST_FOREACH(const CTxOut& txout, vout)
526 if (txout.nValue < CENT)
530 // Raise the price as the block approaches full
531 if (nBlockSize != 1 && nNewBlockSize >= MAX_BLOCK_SIZE_GEN/2)
533 if (nNewBlockSize >= MAX_BLOCK_SIZE_GEN)
535 nMinFee *= MAX_BLOCK_SIZE_GEN / (MAX_BLOCK_SIZE_GEN - nNewBlockSize);
538 if (!MoneyRange(nMinFee))
544 bool CTxMemPool::accept(CTxDB& txdb, CTransaction &tx, bool fCheckInputs,
545 bool* pfMissingInputs)
548 *pfMissingInputs = false;
550 if (!tx.CheckTransaction())
551 return error("CTxMemPool::accept() : CheckTransaction failed");
553 // Coinbase is only valid in a block, not as a loose transaction
555 return tx.DoS(100, error("CTxMemPool::accept() : coinbase as individual tx"));
557 // ppcoin: coinstake is also only valid in a block, not as a loose transaction
558 if (tx.IsCoinStake())
559 return tx.DoS(100, error("CTxMemPool::accept() : coinstake as individual tx"));
561 // To help v0.1.5 clients who would see it as a negative number
562 if ((int64)tx.nLockTime > std::numeric_limits<int>::max())
563 return error("CTxMemPool::accept() : not accepting nLockTime beyond 2038 yet");
565 // Rather not work on nonstandard transactions (unless -testnet)
566 if (!fTestNet && !tx.IsStandard())
567 return error("CTxMemPool::accept() : nonstandard transaction type");
569 // Do we already have it?
570 uint256 hash = tx.GetHash();
573 if (mapTx.count(hash))
577 if (txdb.ContainsTx(hash))
580 // Check for conflicts with in-memory transactions
581 CTransaction* ptxOld = NULL;
582 for (unsigned int i = 0; i < tx.vin.size(); i++)
584 COutPoint outpoint = tx.vin[i].prevout;
585 if (mapNextTx.count(outpoint))
587 // Disable replacement feature for now
590 // Allow replacing with a newer version of the same transaction
593 ptxOld = mapNextTx[outpoint].ptx;
594 if (ptxOld->IsFinal())
596 if (!tx.IsNewerThan(*ptxOld))
598 for (unsigned int i = 0; i < tx.vin.size(); i++)
600 COutPoint outpoint = tx.vin[i].prevout;
601 if (!mapNextTx.count(outpoint) || mapNextTx[outpoint].ptx != ptxOld)
611 map<uint256, CTxIndex> mapUnused;
612 bool fInvalid = false;
613 if (!tx.FetchInputs(txdb, mapUnused, false, false, mapInputs, fInvalid))
616 return error("CTxMemPool::accept() : FetchInputs found invalid tx %s", hash.ToString().substr(0,10).c_str());
618 *pfMissingInputs = true;
622 // Check for non-standard pay-to-script-hash in inputs
623 if (!tx.AreInputsStandard(mapInputs) && !fTestNet)
624 return error("CTxMemPool::accept() : nonstandard transaction input");
626 // Note: if you modify this code to accept non-standard transactions, then
627 // you should add code here to check that the transaction does a
628 // reasonable number of ECDSA signature verifications.
630 int64 nFees = tx.GetValueIn(mapInputs)-tx.GetValueOut();
631 unsigned int nSize = ::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION);
633 // Don't accept it if it can't get into a block
634 int64 txMinFee = tx.GetMinFee(1000, false, GMF_RELAY, nSize);
635 if (nFees < txMinFee)
636 return error("CTxMemPool::accept() : not enough fees %s, %"PRI64d" < %"PRI64d,
637 hash.ToString().c_str(),
640 // Continuously rate-limit free transactions
641 // This mitigates 'penny-flooding' -- sending thousands of free transactions just to
642 // be annoying or make others' transactions take longer to confirm.
643 if (nFees < MIN_RELAY_TX_FEE)
645 static CCriticalSection cs;
646 static double dFreeCount;
647 static int64 nLastTime;
648 int64 nNow = GetTime();
652 // Use an exponentially decaying ~10-minute window:
653 dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
655 // -limitfreerelay unit is thousand-bytes-per-minute
656 // At default rate it would take over a month to fill 1GB
657 if (dFreeCount > GetArg("-limitfreerelay", 15)*10*1000 && !IsFromMe(tx))
658 return error("CTxMemPool::accept() : free transaction rejected by rate limiter");
660 printf("Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
665 // Check against previous transactions
666 // This is done last to help prevent CPU exhaustion denial-of-service attacks.
667 if (!tx.ConnectInputs(txdb, mapInputs, mapUnused, CDiskTxPos(1,1,1), pindexBest, false, false))
669 return error("CTxMemPool::accept() : ConnectInputs failed %s", hash.ToString().substr(0,10).c_str());
673 // Store transaction in memory
678 printf("CTxMemPool::accept() : replacing tx %s with new version\n", ptxOld->GetHash().ToString().c_str());
681 addUnchecked(hash, tx);
684 ///// are we sure this is ok when loading transactions or restoring block txes
685 // If updated, erase old tx from wallet
687 EraseFromWallets(ptxOld->GetHash());
689 printf("CTxMemPool::accept() : accepted %s (poolsz %"PRIszu")\n",
690 hash.ToString().substr(0,10).c_str(),
695 bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMissingInputs)
697 return mempool.accept(txdb, *this, fCheckInputs, pfMissingInputs);
700 bool CTxMemPool::addUnchecked(const uint256& hash, CTransaction &tx)
702 // Add to memory pool without checking anything. Don't call this directly,
703 // call CTxMemPool::accept to properly check the transaction first.
706 for (unsigned int i = 0; i < tx.vin.size(); i++)
707 mapNextTx[tx.vin[i].prevout] = CInPoint(&mapTx[hash], i);
708 nTransactionsUpdated++;
714 bool CTxMemPool::remove(CTransaction &tx)
716 // Remove transaction from memory pool
719 uint256 hash = tx.GetHash();
720 if (mapTx.count(hash))
722 BOOST_FOREACH(const CTxIn& txin, tx.vin)
723 mapNextTx.erase(txin.prevout);
725 nTransactionsUpdated++;
731 void CTxMemPool::clear()
736 ++nTransactionsUpdated;
739 void CTxMemPool::queryHashes(std::vector<uint256>& vtxid)
744 vtxid.reserve(mapTx.size());
745 for (map<uint256, CTransaction>::iterator mi = mapTx.begin(); mi != mapTx.end(); ++mi)
746 vtxid.push_back((*mi).first);
752 int CMerkleTx::GetDepthInMainChain(CBlockIndex* &pindexRet) const
754 if (hashBlock == 0 || nIndex == -1)
757 // Find the block it claims to be in
758 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
759 if (mi == mapBlockIndex.end())
761 CBlockIndex* pindex = (*mi).second;
762 if (!pindex || !pindex->IsInMainChain())
765 // Make sure the merkle branch connects to this block
766 if (!fMerkleVerified)
768 if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != pindex->hashMerkleRoot)
770 fMerkleVerified = true;
774 return pindexBest->nHeight - pindex->nHeight + 1;
778 int CMerkleTx::GetBlocksToMaturity() const
780 if (!(IsCoinBase() || IsCoinStake()))
782 return max(0, (nCoinbaseMaturity+20) - GetDepthInMainChain());
786 bool CMerkleTx::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs)
790 if (!IsInMainChain() && !ClientConnectInputs())
792 return CTransaction::AcceptToMemoryPool(txdb, false);
796 return CTransaction::AcceptToMemoryPool(txdb, fCheckInputs);
800 bool CMerkleTx::AcceptToMemoryPool()
803 return AcceptToMemoryPool(txdb);
808 bool CWalletTx::AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs)
813 // Add previous supporting transactions first
814 BOOST_FOREACH(CMerkleTx& tx, vtxPrev)
816 if (!(tx.IsCoinBase() || tx.IsCoinStake()))
818 uint256 hash = tx.GetHash();
819 if (!mempool.exists(hash) && !txdb.ContainsTx(hash))
820 tx.AcceptToMemoryPool(txdb, fCheckInputs);
823 return AcceptToMemoryPool(txdb, fCheckInputs);
828 bool CWalletTx::AcceptWalletTransaction()
831 return AcceptWalletTransaction(txdb);
834 int CTxIndex::GetDepthInMainChain() const
838 if (!block.ReadFromDisk(pos.nFile, pos.nBlockPos, false))
840 // Find the block in the index
841 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(block.GetHash());
842 if (mi == mapBlockIndex.end())
844 CBlockIndex* pindex = (*mi).second;
845 if (!pindex || !pindex->IsInMainChain())
847 return 1 + nBestHeight - pindex->nHeight;
850 // Return transaction in tx, and if it was found inside a block, its hash is placed in hashBlock
851 bool GetTransaction(const uint256 &hash, CTransaction &tx, uint256 &hashBlock)
857 if (mempool.exists(hash))
859 tx = mempool.lookup(hash);
865 if (tx.ReadFromDisk(txdb, COutPoint(hash, 0), txindex))
868 if (block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
869 hashBlock = block.GetHash();
883 //////////////////////////////////////////////////////////////////////////////
885 // CBlock and CBlockIndex
888 static CBlockIndex* pblockindexFBBHLast;
889 CBlockIndex* FindBlockByHeight(int nHeight)
891 CBlockIndex *pblockindex;
892 if (nHeight < nBestHeight / 2)
893 pblockindex = pindexGenesisBlock;
895 pblockindex = pindexBest;
896 if (pblockindexFBBHLast && abs(nHeight - pblockindex->nHeight) > abs(nHeight - pblockindexFBBHLast->nHeight))
897 pblockindex = pblockindexFBBHLast;
898 while (pblockindex->nHeight > nHeight)
899 pblockindex = pblockindex->pprev;
900 while (pblockindex->nHeight < nHeight)
901 pblockindex = pblockindex->pnext;
902 pblockindexFBBHLast = pblockindex;
906 bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
908 if (!fReadTransactions)
910 *this = pindex->GetBlockHeader();
913 if (!ReadFromDisk(pindex->nFile, pindex->nBlockPos, fReadTransactions))
915 if (GetHash() != pindex->GetBlockHash())
916 return error("CBlock::ReadFromDisk() : GetHash() doesn't match index");
920 uint256 static GetOrphanRoot(const CBlock* pblock)
922 // Work back to the first block in the orphan chain
923 while (mapOrphanBlocks.count(pblock->hashPrevBlock))
924 pblock = mapOrphanBlocks[pblock->hashPrevBlock];
925 return pblock->GetHash();
928 // ppcoin: find block wanted by given orphan block
929 uint256 WantedByOrphan(const CBlock* pblockOrphan)
931 // Work back to the first block in the orphan chain
932 while (mapOrphanBlocks.count(pblockOrphan->hashPrevBlock))
933 pblockOrphan = mapOrphanBlocks[pblockOrphan->hashPrevBlock];
934 return pblockOrphan->hashPrevBlock;
937 // select stake target limit according to hard-coded conditions
938 CBigNum inline GetProofOfStakeLimit(int nHeight, unsigned int nTime)
940 if(fTestNet) // separate proof of stake target limit for testnet
941 return bnProofOfStakeLimit;
942 if(nTime > TARGETS_SWITCH_TIME) // 27 bits since 20 July 2013
943 return bnProofOfStakeLimit;
944 if(nHeight + 1 > 15000) // 24 bits since block 15000
945 return bnProofOfStakeLegacyLimit;
946 if(nHeight + 1 > 14060) // 31 bits since block 14060 until 15000
947 return bnProofOfStakeHardLimit;
949 return bnProofOfWorkLimit; // return bnProofOfWorkLimit of none matched
952 // miner's coin base reward based on nBits
953 int64 GetProofOfWorkReward(unsigned int nBits)
955 CBigNum bnSubsidyLimit = MAX_MINT_PROOF_OF_WORK;
958 bnTarget.SetCompact(nBits);
959 CBigNum bnTargetLimit = bnProofOfWorkLimit;
960 bnTargetLimit.SetCompact(bnTargetLimit.GetCompact());
962 // NovaCoin: subsidy is cut in half every 64x multiply of PoW difficulty
963 // A reasonably continuous curve is used to avoid shock to market
964 // (nSubsidyLimit / nSubsidy) ** 6 == bnProofOfWorkLimit / bnTarget
966 // Human readable form:
968 // nSubsidy = 100 / (diff ^ 1/6)
969 CBigNum bnLowerBound = CENT;
970 CBigNum bnUpperBound = bnSubsidyLimit;
971 while (bnLowerBound + CENT <= bnUpperBound)
973 CBigNum bnMidValue = (bnLowerBound + bnUpperBound) / 2;
974 if (fDebug && GetBoolArg("-printcreation"))
975 printf("GetProofOfWorkReward() : lower=%"PRI64d" upper=%"PRI64d" mid=%"PRI64d"\n", bnLowerBound.getuint64(), bnUpperBound.getuint64(), bnMidValue.getuint64());
976 if (bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnTargetLimit > bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnSubsidyLimit * bnTarget)
977 bnUpperBound = bnMidValue;
979 bnLowerBound = bnMidValue;
982 int64 nSubsidy = bnUpperBound.getuint64();
984 nSubsidy = (nSubsidy / CENT) * CENT;
985 if (fDebug && GetBoolArg("-printcreation"))
986 printf("GetProofOfWorkReward() : create=%s nBits=0x%08x nSubsidy=%"PRI64d"\n", FormatMoney(nSubsidy).c_str(), nBits, nSubsidy);
988 return min(nSubsidy, MAX_MINT_PROOF_OF_WORK);
991 // miner's coin stake reward based on nBits and coin age spent (coin-days)
992 int64 GetProofOfStakeReward(int64 nCoinAge, unsigned int nBits, unsigned int nTime, bool bCoinYearOnly)
994 int64 nRewardCoinYear, nSubsidy, nSubsidyLimit = 10 * COIN;
996 if(fTestNet || nTime > STAKE_SWITCH_TIME)
998 // Stage 2 of emission process is PoS-based. It will be active on mainNet since 20 Jun 2013.
1000 CBigNum bnRewardCoinYearLimit = MAX_MINT_PROOF_OF_STAKE; // Base stake mint rate, 100% year interest
1002 bnTarget.SetCompact(nBits);
1003 CBigNum bnTargetLimit = GetProofOfStakeLimit(0, nTime);
1004 bnTargetLimit.SetCompact(bnTargetLimit.GetCompact());
1006 // NovaCoin: A reasonably continuous curve is used to avoid shock to market
1008 CBigNum bnLowerBound = 1 * CENT, // Lower interest bound is 1% per year
1009 bnUpperBound = bnRewardCoinYearLimit, // Upper interest bound is 100% per year
1010 bnMidPart, bnRewardPart;
1012 while (bnLowerBound + CENT <= bnUpperBound)
1014 CBigNum bnMidValue = (bnLowerBound + bnUpperBound) / 2;
1015 if (fDebug && GetBoolArg("-printcreation"))
1016 printf("GetProofOfStakeReward() : lower=%"PRI64d" upper=%"PRI64d" mid=%"PRI64d"\n", bnLowerBound.getuint64(), bnUpperBound.getuint64(), bnMidValue.getuint64());
1018 if(!fTestNet && nTime < STAKECURVE_SWITCH_TIME)
1021 // Until 20 Oct 2013: reward for coin-year is cut in half every 64x multiply of PoS difficulty
1023 // (nRewardCoinYearLimit / nRewardCoinYear) ** 6 == bnProofOfStakeLimit / bnTarget
1025 // Human readable form: nRewardCoinYear = 1 / (posdiff ^ 1/6)
1028 bnMidPart = bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue * bnMidValue;
1029 bnRewardPart = bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit;
1034 // Since 20 Oct 2013: reward for coin-year is cut in half every 8x multiply of PoS difficulty
1036 // (nRewardCoinYearLimit / nRewardCoinYear) ** 3 == bnProofOfStakeLimit / bnTarget
1038 // Human readable form: nRewardCoinYear = 1 / (posdiff ^ 1/3)
1041 bnMidPart = bnMidValue * bnMidValue * bnMidValue;
1042 bnRewardPart = bnRewardCoinYearLimit * bnRewardCoinYearLimit * bnRewardCoinYearLimit;
1045 if (bnMidPart * bnTargetLimit > bnRewardPart * bnTarget)
1046 bnUpperBound = bnMidValue;
1048 bnLowerBound = bnMidValue;
1051 nRewardCoinYear = bnUpperBound.getuint64();
1052 nRewardCoinYear = min((nRewardCoinYear / CENT) * CENT, MAX_MINT_PROOF_OF_STAKE);
1056 // Old creation amount per coin-year, 5% fixed stake mint rate
1057 nRewardCoinYear = 5 * CENT;
1061 return nRewardCoinYear;
1063 nSubsidy = nCoinAge * nRewardCoinYear * 33 / (365 * 33 + 8);
1065 // Set reasonable reward limit for large inputs since 20 Oct 2013
1067 // This will stimulate large holders to use smaller inputs, that's good for the network protection
1068 if(fTestNet || STAKECURVE_SWITCH_TIME < nTime)
1070 if (fDebug && GetBoolArg("-printcreation") && nSubsidyLimit < nSubsidy)
1071 printf("GetProofOfStakeReward(): %s is greater than %s, coinstake reward will be truncated\n", FormatMoney(nSubsidy).c_str(), FormatMoney(nSubsidyLimit).c_str());
1073 nSubsidy = min(nSubsidy, nSubsidyLimit);
1076 if (fDebug && GetBoolArg("-printcreation"))
1077 printf("GetProofOfStakeReward(): create=%s nCoinAge=%"PRI64d" nBits=%d\n", FormatMoney(nSubsidy).c_str(), nCoinAge, nBits);
1081 static const int64 nTargetTimespan = 7 * 24 * 60 * 60; // one week
1083 // get proof of work blocks max spacing according to hard-coded conditions
1084 int64 inline GetTargetSpacingWorkMax(int nHeight, unsigned int nTime)
1086 if(nTime > TARGETS_SWITCH_TIME)
1087 return 3 * nStakeTargetSpacing; // 30 minutes on mainNet since 20 Jul 2013 00:00:00
1090 return 3 * nStakeTargetSpacing; // 15 minutes on testNet
1092 return 12 * nStakeTargetSpacing; // 2 hours otherwise
1096 // maximum nBits value could possible be required nTime after
1098 unsigned int ComputeMaxBits(CBigNum bnTargetLimit, unsigned int nBase, int64 nTime)
1101 bnResult.SetCompact(nBase);
1103 while (nTime > 0 && bnResult < bnTargetLimit)
1105 // Maximum 200% adjustment per day...
1107 nTime -= 24 * 60 * 60;
1109 if (bnResult > bnTargetLimit)
1110 bnResult = bnTargetLimit;
1111 return bnResult.GetCompact();
1115 // minimum amount of work that could possibly be required nTime after
1116 // minimum proof-of-work required was nBase
1118 unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
1120 return ComputeMaxBits(bnProofOfWorkLimit, nBase, nTime);
1124 // minimum amount of stake that could possibly be required nTime after
1125 // minimum proof-of-stake required was nBase
1127 unsigned int ComputeMinStake(unsigned int nBase, int64 nTime, unsigned int nBlockTime)
1129 return ComputeMaxBits(GetProofOfStakeLimit(0, nBlockTime), nBase, nTime);
1133 // ppcoin: find last block index up to pindex
1134 const CBlockIndex* GetLastBlockIndex(const CBlockIndex* pindex, bool fProofOfStake)
1136 while (pindex && pindex->pprev && (pindex->IsProofOfStake() != fProofOfStake))
1137 pindex = pindex->pprev;
1141 unsigned int GetNextTargetRequired(const CBlockIndex* pindexLast, bool fProofOfStake)
1143 CBigNum bnTargetLimit = !fProofOfStake ? bnProofOfWorkLimit : GetProofOfStakeLimit(pindexLast->nHeight, pindexLast->nTime);
1145 if (pindexLast == NULL)
1146 return bnTargetLimit.GetCompact(); // genesis block
1148 const CBlockIndex* pindexPrev = GetLastBlockIndex(pindexLast, fProofOfStake);
1149 if (pindexPrev->pprev == NULL)
1150 return bnTargetLimit.GetCompact(); // first block
1151 const CBlockIndex* pindexPrevPrev = GetLastBlockIndex(pindexPrev->pprev, fProofOfStake);
1152 if (pindexPrevPrev->pprev == NULL)
1153 return bnTargetLimit.GetCompact(); // second block
1155 int64 nActualSpacing = pindexPrev->GetBlockTime() - pindexPrevPrev->GetBlockTime();
1157 // ppcoin: target change every block
1158 // ppcoin: retarget with exponential moving toward target spacing
1160 bnNew.SetCompact(pindexPrev->nBits);
1161 int64 nTargetSpacing = fProofOfStake? nStakeTargetSpacing : min(GetTargetSpacingWorkMax(pindexLast->nHeight, pindexLast->nTime), (int64) nStakeTargetSpacing * (1 + pindexLast->nHeight - pindexPrev->nHeight));
1162 int64 nInterval = nTargetTimespan / nTargetSpacing;
1163 bnNew *= ((nInterval - 1) * nTargetSpacing + nActualSpacing + nActualSpacing);
1164 bnNew /= ((nInterval + 1) * nTargetSpacing);
1166 if (bnNew > bnTargetLimit)
1167 bnNew = bnTargetLimit;
1169 return bnNew.GetCompact();
1172 bool CheckProofOfWork(uint256 hash, unsigned int nBits)
1175 bnTarget.SetCompact(nBits);
1178 if (bnTarget <= 0 || bnTarget > bnProofOfWorkLimit)
1179 return error("CheckProofOfWork() : nBits below minimum work");
1181 // Check proof of work matches claimed amount
1182 if (hash > bnTarget.getuint256())
1183 return error("CheckProofOfWork() : hash doesn't match nBits");
1188 // Return maximum amount of blocks that other nodes claim to have
1189 int GetNumBlocksOfPeers()
1191 return std::max(cPeerBlockCounts.median(), Checkpoints::GetTotalBlocksEstimate());
1194 bool IsInitialBlockDownload()
1196 if (pindexBest == NULL || nBestHeight < Checkpoints::GetTotalBlocksEstimate())
1198 static int64 nLastUpdate;
1199 static CBlockIndex* pindexLastBest;
1200 if (pindexBest != pindexLastBest)
1202 pindexLastBest = pindexBest;
1203 nLastUpdate = GetTime();
1205 return (GetTime() - nLastUpdate < 10 &&
1206 pindexBest->GetBlockTime() < GetTime() - 24 * 60 * 60);
1209 void static InvalidChainFound(CBlockIndex* pindexNew)
1211 if (pindexNew->nChainTrust > nBestInvalidTrust)
1213 nBestInvalidTrust = pindexNew->nChainTrust;
1214 CTxDB().WriteBestInvalidTrust(CBigNum(nBestInvalidTrust));
1215 uiInterface.NotifyBlocksChanged();
1218 uint256 nBestInvalidBlockTrust = pindexNew->nChainTrust - pindexNew->pprev->nChainTrust;
1219 uint256 nBestBlockTrust = pindexBest->nHeight != 0 ? (pindexBest->nChainTrust - pindexBest->pprev->nChainTrust) : pindexBest->nChainTrust;
1221 printf("InvalidChainFound: invalid block=%s height=%d trust=%s blocktrust=%"PRI64d" date=%s\n",
1222 pindexNew->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->nHeight,
1223 CBigNum(pindexNew->nChainTrust).ToString().c_str(), nBestInvalidBlockTrust.Get64(),
1224 DateTimeStrFormat("%x %H:%M:%S", pindexNew->GetBlockTime()).c_str());
1225 printf("InvalidChainFound: current best=%s height=%d trust=%s blocktrust=%"PRI64d" date=%s\n",
1226 hashBestChain.ToString().substr(0,20).c_str(), nBestHeight,
1227 CBigNum(pindexBest->nChainTrust).ToString().c_str(),
1228 nBestBlockTrust.Get64(),
1229 DateTimeStrFormat("%x %H:%M:%S", pindexBest->GetBlockTime()).c_str());
1233 void CBlock::UpdateTime(const CBlockIndex* pindexPrev)
1235 nTime = max(GetBlockTime(), GetAdjustedTime());
1248 bool CTransaction::DisconnectInputs(CTxDB& txdb)
1250 // Relinquish previous transactions' spent pointers
1253 BOOST_FOREACH(const CTxIn& txin, vin)
1255 COutPoint prevout = txin.prevout;
1257 // Get prev txindex from disk
1259 if (!txdb.ReadTxIndex(prevout.hash, txindex))
1260 return error("DisconnectInputs() : ReadTxIndex failed");
1262 if (prevout.n >= txindex.vSpent.size())
1263 return error("DisconnectInputs() : prevout.n out of range");
1265 // Mark outpoint as not spent
1266 txindex.vSpent[prevout.n].SetNull();
1269 if (!txdb.UpdateTxIndex(prevout.hash, txindex))
1270 return error("DisconnectInputs() : UpdateTxIndex failed");
1274 // Remove transaction from index
1275 // This can fail if a duplicate of this transaction was in a chain that got
1276 // reorganized away. This is only possible if this transaction was completely
1277 // spent, so erasing it would be a no-op anyway.
1278 txdb.EraseTxIndex(*this);
1284 bool CTransaction::FetchInputs(CTxDB& txdb, const map<uint256, CTxIndex>& mapTestPool,
1285 bool fBlock, bool fMiner, MapPrevTx& inputsRet, bool& fInvalid)
1287 // FetchInputs can return false either because we just haven't seen some inputs
1288 // (in which case the transaction should be stored as an orphan)
1289 // or because the transaction is malformed (in which case the transaction should
1290 // be dropped). If tx is definitely invalid, fInvalid will be set to true.
1294 return true; // Coinbase transactions have no inputs to fetch.
1296 for (unsigned int i = 0; i < vin.size(); i++)
1298 COutPoint prevout = vin[i].prevout;
1299 if (inputsRet.count(prevout.hash))
1300 continue; // Got it already
1303 CTxIndex& txindex = inputsRet[prevout.hash].first;
1305 if ((fBlock || fMiner) && mapTestPool.count(prevout.hash))
1307 // Get txindex from current proposed changes
1308 txindex = mapTestPool.find(prevout.hash)->second;
1312 // Read txindex from txdb
1313 fFound = txdb.ReadTxIndex(prevout.hash, txindex);
1315 if (!fFound && (fBlock || fMiner))
1316 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());
1319 CTransaction& txPrev = inputsRet[prevout.hash].second;
1320 if (!fFound || txindex.pos == CDiskTxPos(1,1,1))
1322 // Get prev tx from single transactions in memory
1325 if (!mempool.exists(prevout.hash))
1326 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());
1327 txPrev = mempool.lookup(prevout.hash);
1330 txindex.vSpent.resize(txPrev.vout.size());
1334 // Get prev tx from disk
1335 if (!txPrev.ReadFromDisk(txindex.pos))
1336 return error("FetchInputs() : %s ReadFromDisk prev tx %s failed", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
1340 // Make sure all prevout.n indexes are valid:
1341 for (unsigned int i = 0; i < vin.size(); i++)
1343 const COutPoint prevout = vin[i].prevout;
1344 assert(inputsRet.count(prevout.hash) != 0);
1345 const CTxIndex& txindex = inputsRet[prevout.hash].first;
1346 const CTransaction& txPrev = inputsRet[prevout.hash].second;
1347 if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
1349 // Revisit this if/when transaction replacement is implemented and allows
1352 return DoS(100, error("FetchInputs() : %s prevout.n out of range %d %"PRIszu" %"PRIszu" 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()));
1359 const CTxOut& CTransaction::GetOutputFor(const CTxIn& input, const MapPrevTx& inputs) const
1361 MapPrevTx::const_iterator mi = inputs.find(input.prevout.hash);
1362 if (mi == inputs.end())
1363 throw std::runtime_error("CTransaction::GetOutputFor() : prevout.hash not found");
1365 const CTransaction& txPrev = (mi->second).second;
1366 if (input.prevout.n >= txPrev.vout.size())
1367 throw std::runtime_error("CTransaction::GetOutputFor() : prevout.n out of range");
1369 return txPrev.vout[input.prevout.n];
1372 int64 CTransaction::GetValueIn(const MapPrevTx& inputs) const
1378 for (unsigned int i = 0; i < vin.size(); i++)
1380 nResult += GetOutputFor(vin[i], inputs).nValue;
1386 unsigned int CTransaction::GetP2SHSigOpCount(const MapPrevTx& inputs) const
1391 unsigned int nSigOps = 0;
1392 for (unsigned int i = 0; i < vin.size(); i++)
1394 const CTxOut& prevout = GetOutputFor(vin[i], inputs);
1395 if (prevout.scriptPubKey.IsPayToScriptHash())
1396 nSigOps += prevout.scriptPubKey.GetSigOpCount(vin[i].scriptSig);
1401 bool CTransaction::ConnectInputs(CTxDB& txdb, MapPrevTx inputs,
1402 map<uint256, CTxIndex>& mapTestPool, const CDiskTxPos& posThisTx,
1403 const CBlockIndex* pindexBlock, bool fBlock, bool fMiner, bool fStrictPayToScriptHash)
1405 // Take over previous transactions' spent pointers
1406 // fBlock is true when this is called from AcceptBlock when a new best-block is added to the blockchain
1407 // fMiner is true when called from the internal bitcoin miner
1408 // ... both are false when called from CTransaction::AcceptToMemoryPool
1413 for (unsigned int i = 0; i < vin.size(); i++)
1415 COutPoint prevout = vin[i].prevout;
1416 assert(inputs.count(prevout.hash) > 0);
1417 CTxIndex& txindex = inputs[prevout.hash].first;
1418 CTransaction& txPrev = inputs[prevout.hash].second;
1420 if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
1421 return DoS(100, error("ConnectInputs() : %s prevout.n out of range %d %"PRIszu" %"PRIszu" 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()));
1423 // If prev is coinbase or coinstake, check that it's matured
1424 if (txPrev.IsCoinBase() || txPrev.IsCoinStake())
1425 for (const CBlockIndex* pindex = pindexBlock; pindex && pindexBlock->nHeight - pindex->nHeight < nCoinbaseMaturity; pindex = pindex->pprev)
1426 if (pindex->nBlockPos == txindex.pos.nBlockPos && pindex->nFile == txindex.pos.nFile)
1427 return error("ConnectInputs() : tried to spend %s at depth %d", txPrev.IsCoinBase() ? "coinbase" : "coinstake", pindexBlock->nHeight - pindex->nHeight);
1429 // ppcoin: check transaction timestamp
1430 if (txPrev.nTime > nTime)
1431 return DoS(100, error("ConnectInputs() : transaction timestamp earlier than input transaction"));
1433 // Check for negative or overflow input values
1434 nValueIn += txPrev.vout[prevout.n].nValue;
1435 if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
1436 return DoS(100, error("ConnectInputs() : txin values out of range"));
1439 // The first loop above does all the inexpensive checks.
1440 // Only if ALL inputs pass do we perform expensive ECDSA signature checks.
1441 // Helps prevent CPU exhaustion attacks.
1442 for (unsigned int i = 0; i < vin.size(); i++)
1444 COutPoint prevout = vin[i].prevout;
1445 assert(inputs.count(prevout.hash) > 0);
1446 CTxIndex& txindex = inputs[prevout.hash].first;
1447 CTransaction& txPrev = inputs[prevout.hash].second;
1449 // Check for conflicts (double-spend)
1450 // This doesn't trigger the DoS code on purpose; if it did, it would make it easier
1451 // for an attacker to attempt to split the network.
1452 if (!txindex.vSpent[prevout.n].IsNull())
1453 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());
1455 // Skip ECDSA signature verification when connecting blocks (fBlock=true)
1456 // before the last blockchain checkpoint. This is safe because block merkle hashes are
1457 // still computed and checked, and any change will be caught at the next checkpoint.
1458 if (!(fBlock && (nBestHeight < Checkpoints::GetTotalBlocksEstimate())))
1461 if (!VerifySignature(txPrev, *this, i, fStrictPayToScriptHash, 0))
1463 // only during transition phase for P2SH: do not invoke anti-DoS code for
1464 // potentially old clients relaying bad P2SH transactions
1465 if (fStrictPayToScriptHash && VerifySignature(txPrev, *this, i, false, 0))
1466 return error("ConnectInputs() : %s P2SH VerifySignature failed", GetHash().ToString().substr(0,10).c_str());
1468 return DoS(100,error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str()));
1472 // Mark outpoints as spent
1473 txindex.vSpent[prevout.n] = posThisTx;
1476 if (fBlock || fMiner)
1478 mapTestPool[prevout.hash] = txindex;
1484 // ppcoin: coin stake tx earns reward instead of paying fee
1486 if (!GetCoinAge(txdb, nCoinAge))
1487 return error("ConnectInputs() : %s unable to get coin age for coinstake", GetHash().ToString().substr(0,10).c_str());
1489 int64 nStakeReward = GetValueOut() - nValueIn;
1490 int64 nCalculatedStakeReward = GetProofOfStakeReward(nCoinAge, pindexBlock->nBits, nTime) - GetMinFee() + MIN_TX_FEE;
1492 if (nStakeReward > nCalculatedStakeReward)
1493 return DoS(100, error("ConnectInputs() : coinstake pays too much(actual=%"PRI64d" vs calculated=%"PRI64d")", nStakeReward, nCalculatedStakeReward));
1497 if (nValueIn < GetValueOut())
1498 return DoS(100, error("ConnectInputs() : %s value in < value out", GetHash().ToString().substr(0,10).c_str()));
1500 // Tally transaction fees
1501 int64 nTxFee = nValueIn - GetValueOut();
1503 return DoS(100, error("ConnectInputs() : %s nTxFee < 0", GetHash().ToString().substr(0,10).c_str()));
1504 // ppcoin: enforce transaction fees for every block
1505 if (nTxFee < GetMinFee())
1506 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;
1509 if (!MoneyRange(nFees))
1510 return DoS(100, error("ConnectInputs() : nFees out of range"));
1518 bool CTransaction::ClientConnectInputs()
1523 // Take over previous transactions' spent pointers
1527 for (unsigned int i = 0; i < vin.size(); i++)
1529 // Get prev tx from single transactions in memory
1530 COutPoint prevout = vin[i].prevout;
1531 if (!mempool.exists(prevout.hash))
1533 CTransaction& txPrev = mempool.lookup(prevout.hash);
1535 if (prevout.n >= txPrev.vout.size())
1539 if (!VerifySignature(txPrev, *this, i, true, 0))
1540 return error("ConnectInputs() : VerifySignature failed");
1542 ///// this is redundant with the mempool.mapNextTx stuff,
1543 ///// not sure which I want to get rid of
1544 ///// this has to go away now that posNext is gone
1545 // // Check for conflicts
1546 // if (!txPrev.vout[prevout.n].posNext.IsNull())
1547 // return error("ConnectInputs() : prev tx already used");
1549 // // Flag outpoints as used
1550 // txPrev.vout[prevout.n].posNext = posThisTx;
1552 nValueIn += txPrev.vout[prevout.n].nValue;
1554 if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
1555 return error("ClientConnectInputs() : txin values out of range");
1557 if (GetValueOut() > nValueIn)
1567 bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
1569 // Disconnect in reverse order
1570 for (int i = vtx.size()-1; i >= 0; i--)
1571 if (!vtx[i].DisconnectInputs(txdb))
1574 // Update block index on disk without changing it in memory.
1575 // The memory index structure will be changed after the db commits.
1578 CDiskBlockIndex blockindexPrev(pindex->pprev);
1579 blockindexPrev.hashNext = 0;
1580 if (!txdb.WriteBlockIndex(blockindexPrev))
1581 return error("DisconnectBlock() : WriteBlockIndex failed");
1584 // ppcoin: clean up wallet after disconnecting coinstake
1585 BOOST_FOREACH(CTransaction& tx, vtx)
1586 SyncWithWallets(tx, this, false, false);
1591 bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex, bool fJustCheck)
1593 // Check it again in case a previous version let a bad block in, but skip BlockSig checking
1594 if (!CheckBlock(!fJustCheck, !fJustCheck, false))
1597 // Do not allow blocks that contain transactions which 'overwrite' older transactions,
1598 // unless those are already completely spent.
1599 // If such overwrites are allowed, coinbases and transactions depending upon those
1600 // can be duplicated to remove the ability to spend the first instance -- even after
1601 // being sent to another address.
1602 // See BIP30 and http://r6.ca/blog/20120206T005236Z.html for more information.
1603 // This logic is not necessary for memory pool transactions, as AcceptToMemoryPool
1604 // already refuses previously-known transaction ids entirely.
1605 // This rule was originally applied all blocks whose timestamp was after March 15, 2012, 0:00 UTC.
1606 // Now that the whole chain is irreversibly beyond that time it is applied to all blocks except the
1607 // two in the chain that violate it. This prevents exploiting the issue against nodes in their
1608 // initial block download.
1609 bool fEnforceBIP30 = true; // Always active in NovaCoin
1610 bool fStrictPayToScriptHash = true; // Always active in NovaCoin
1612 //// issue here: it doesn't know the version
1613 unsigned int nTxPos;
1615 // FetchInputs treats CDiskTxPos(1,1,1) as a special "refer to memorypool" indicator
1616 // Since we're just checking the block and not actually connecting it, it might not (and probably shouldn't) be on the disk to get the transaction from
1619 nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK, CLIENT_VERSION) - (2 * GetSizeOfCompactSize(0)) + GetSizeOfCompactSize(vtx.size());
1621 map<uint256, CTxIndex> mapQueuedChanges;
1624 int64 nValueOut = 0;
1625 unsigned int nSigOps = 0;
1626 BOOST_FOREACH(CTransaction& tx, vtx)
1628 uint256 hashTx = tx.GetHash();
1630 if (fEnforceBIP30) {
1631 CTxIndex txindexOld;
1632 if (txdb.ReadTxIndex(hashTx, txindexOld)) {
1633 BOOST_FOREACH(CDiskTxPos &pos, txindexOld.vSpent)
1639 nSigOps += tx.GetLegacySigOpCount();
1640 if (nSigOps > MAX_BLOCK_SIGOPS)
1641 return DoS(100, error("ConnectBlock() : too many sigops"));
1643 CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
1645 nTxPos += ::GetSerializeSize(tx, SER_DISK, CLIENT_VERSION);
1647 MapPrevTx mapInputs;
1648 if (tx.IsCoinBase())
1649 nValueOut += tx.GetValueOut();
1653 if (!tx.FetchInputs(txdb, mapQueuedChanges, true, false, mapInputs, fInvalid))
1656 if (fStrictPayToScriptHash)
1658 // Add in sigops done by pay-to-script-hash inputs;
1659 // this is to prevent a "rogue miner" from creating
1660 // an incredibly-expensive-to-validate block.
1661 nSigOps += tx.GetP2SHSigOpCount(mapInputs);
1662 if (nSigOps > MAX_BLOCK_SIGOPS)
1663 return DoS(100, error("ConnectBlock() : too many sigops"));
1666 int64 nTxValueIn = tx.GetValueIn(mapInputs);
1667 int64 nTxValueOut = tx.GetValueOut();
1668 nValueIn += nTxValueIn;
1669 nValueOut += nTxValueOut;
1670 if (!tx.IsCoinStake())
1671 nFees += nTxValueIn - nTxValueOut;
1673 if (!tx.ConnectInputs(txdb, mapInputs, mapQueuedChanges, posThisTx, pindex, true, false, fStrictPayToScriptHash))
1677 mapQueuedChanges[hashTx] = CTxIndex(posThisTx, tx.vout.size());
1680 // ppcoin: track money supply and mint amount info
1681 pindex->nMint = nValueOut - nValueIn + nFees;
1682 pindex->nMoneySupply = (pindex->pprev? pindex->pprev->nMoneySupply : 0) + nValueOut - nValueIn;
1683 if (!txdb.WriteBlockIndex(CDiskBlockIndex(pindex)))
1684 return error("Connect() : WriteBlockIndex for pindex failed");
1686 // ppcoin: fees are not collected by miners as in bitcoin
1687 // ppcoin: fees are destroyed to compensate the entire network
1688 if (fDebug && GetBoolArg("-printcreation"))
1689 printf("ConnectBlock() : destroy=%s nFees=%"PRI64d"\n", FormatMoney(nFees).c_str(), nFees);
1694 // Write queued txindex changes
1695 for (map<uint256, CTxIndex>::iterator mi = mapQueuedChanges.begin(); mi != mapQueuedChanges.end(); ++mi)
1697 if (!txdb.UpdateTxIndex((*mi).first, (*mi).second))
1698 return error("ConnectBlock() : UpdateTxIndex failed");
1701 // Update block index on disk without changing it in memory.
1702 // The memory index structure will be changed after the db commits.
1705 CDiskBlockIndex blockindexPrev(pindex->pprev);
1706 blockindexPrev.hashNext = pindex->GetBlockHash();
1707 if (!txdb.WriteBlockIndex(blockindexPrev))
1708 return error("ConnectBlock() : WriteBlockIndex failed");
1711 // Watch for transactions paying to me
1712 BOOST_FOREACH(CTransaction& tx, vtx)
1713 SyncWithWallets(tx, this, true);
1718 bool static Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
1720 printf("REORGANIZE\n");
1723 CBlockIndex* pfork = pindexBest;
1724 CBlockIndex* plonger = pindexNew;
1725 while (pfork != plonger)
1727 while (plonger->nHeight > pfork->nHeight)
1728 if (!(plonger = plonger->pprev))
1729 return error("Reorganize() : plonger->pprev is null");
1730 if (pfork == plonger)
1732 if (!(pfork = pfork->pprev))
1733 return error("Reorganize() : pfork->pprev is null");
1736 // List of what to disconnect
1737 vector<CBlockIndex*> vDisconnect;
1738 for (CBlockIndex* pindex = pindexBest; pindex != pfork; pindex = pindex->pprev)
1739 vDisconnect.push_back(pindex);
1741 // List of what to connect
1742 vector<CBlockIndex*> vConnect;
1743 for (CBlockIndex* pindex = pindexNew; pindex != pfork; pindex = pindex->pprev)
1744 vConnect.push_back(pindex);
1745 reverse(vConnect.begin(), vConnect.end());
1747 printf("REORGANIZE: Disconnect %"PRIszu" blocks; %s..%s\n", vDisconnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexBest->GetBlockHash().ToString().substr(0,20).c_str());
1748 printf("REORGANIZE: Connect %"PRIszu" blocks; %s..%s\n", vConnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->GetBlockHash().ToString().substr(0,20).c_str());
1750 // Disconnect shorter branch
1751 vector<CTransaction> vResurrect;
1752 BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
1755 if (!block.ReadFromDisk(pindex))
1756 return error("Reorganize() : ReadFromDisk for disconnect failed");
1757 if (!block.DisconnectBlock(txdb, pindex))
1758 return error("Reorganize() : DisconnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
1760 // Queue memory transactions to resurrect
1761 BOOST_FOREACH(const CTransaction& tx, block.vtx)
1762 if (!(tx.IsCoinBase() || tx.IsCoinStake()))
1763 vResurrect.push_back(tx);
1766 // Connect longer branch
1767 vector<CTransaction> vDelete;
1768 for (unsigned int i = 0; i < vConnect.size(); i++)
1770 CBlockIndex* pindex = vConnect[i];
1772 if (!block.ReadFromDisk(pindex))
1773 return error("Reorganize() : ReadFromDisk for connect failed");
1774 if (!block.ConnectBlock(txdb, pindex))
1777 return error("Reorganize() : ConnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
1780 // Queue memory transactions to delete
1781 BOOST_FOREACH(const CTransaction& tx, block.vtx)
1782 vDelete.push_back(tx);
1784 if (!txdb.WriteHashBestChain(pindexNew->GetBlockHash()))
1785 return error("Reorganize() : WriteHashBestChain failed");
1787 // Make sure it's successfully written to disk before changing memory structure
1788 if (!txdb.TxnCommit())
1789 return error("Reorganize() : TxnCommit failed");
1791 // Disconnect shorter branch
1792 BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
1794 pindex->pprev->pnext = NULL;
1796 // Connect longer branch
1797 BOOST_FOREACH(CBlockIndex* pindex, vConnect)
1799 pindex->pprev->pnext = pindex;
1801 // Resurrect memory transactions that were in the disconnected branch
1802 BOOST_FOREACH(CTransaction& tx, vResurrect)
1803 tx.AcceptToMemoryPool(txdb, false);
1805 // Delete redundant memory transactions that are in the connected branch
1806 BOOST_FOREACH(CTransaction& tx, vDelete)
1809 printf("REORGANIZE: done\n");
1815 // Called from inside SetBestChain: attaches a block to the new best chain being built
1816 bool CBlock::SetBestChainInner(CTxDB& txdb, CBlockIndex *pindexNew)
1818 uint256 hash = GetHash();
1820 // Adding to current best branch
1821 if (!ConnectBlock(txdb, pindexNew) || !txdb.WriteHashBestChain(hash))
1824 InvalidChainFound(pindexNew);
1827 if (!txdb.TxnCommit())
1828 return error("SetBestChain() : TxnCommit failed");
1830 // Add to current best branch
1831 pindexNew->pprev->pnext = pindexNew;
1833 // Delete redundant memory transactions
1834 BOOST_FOREACH(CTransaction& tx, vtx)
1840 bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
1842 uint256 hash = GetHash();
1844 if (!txdb.TxnBegin())
1845 return error("SetBestChain() : TxnBegin failed");
1847 if (pindexGenesisBlock == NULL && hash == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet))
1849 txdb.WriteHashBestChain(hash);
1850 if (!txdb.TxnCommit())
1851 return error("SetBestChain() : TxnCommit failed");
1852 pindexGenesisBlock = pindexNew;
1854 else if (hashPrevBlock == hashBestChain)
1856 if (!SetBestChainInner(txdb, pindexNew))
1857 return error("SetBestChain() : SetBestChainInner failed");
1861 // the first block in the new chain that will cause it to become the new best chain
1862 CBlockIndex *pindexIntermediate = pindexNew;
1864 // list of blocks that need to be connected afterwards
1865 std::vector<CBlockIndex*> vpindexSecondary;
1867 // Reorganize is costly in terms of db load, as it works in a single db transaction.
1868 // Try to limit how much needs to be done inside
1869 while (pindexIntermediate->pprev && pindexIntermediate->pprev->nChainTrust > pindexBest->nChainTrust)
1871 vpindexSecondary.push_back(pindexIntermediate);
1872 pindexIntermediate = pindexIntermediate->pprev;
1875 if (!vpindexSecondary.empty())
1876 printf("Postponing %"PRIszu" reconnects\n", vpindexSecondary.size());
1878 // Switch to new best branch
1879 if (!Reorganize(txdb, pindexIntermediate))
1882 InvalidChainFound(pindexNew);
1883 return error("SetBestChain() : Reorganize failed");
1886 // Connect further blocks
1887 BOOST_REVERSE_FOREACH(CBlockIndex *pindex, vpindexSecondary)
1890 if (!block.ReadFromDisk(pindex))
1892 printf("SetBestChain() : ReadFromDisk failed\n");
1895 if (!txdb.TxnBegin()) {
1896 printf("SetBestChain() : TxnBegin 2 failed\n");
1899 // errors now are not fatal, we still did a reorganisation to a new chain in a valid way
1900 if (!block.SetBestChainInner(txdb, pindex))
1905 // Update best block in wallet (so we can detect restored wallets)
1906 bool fIsInitialDownload = IsInitialBlockDownload();
1907 if (!fIsInitialDownload)
1909 const CBlockLocator locator(pindexNew);
1910 ::SetBestChain(locator);
1914 hashBestChain = hash;
1915 pindexBest = pindexNew;
1916 pblockindexFBBHLast = NULL;
1917 nBestHeight = pindexBest->nHeight;
1918 nBestChainTrust = pindexNew->nChainTrust;
1919 nTimeBestReceived = GetTime();
1920 nTransactionsUpdated++;
1922 uint256 nBestBlockTrust = pindexBest->nHeight != 0 ? (pindexBest->nChainTrust - pindexBest->pprev->nChainTrust) : pindexBest->nChainTrust;
1924 printf("SetBestChain: new best=%s height=%d trust=%s blocktrust=%"PRI64d" date=%s\n",
1925 hashBestChain.ToString().substr(0,20).c_str(), nBestHeight,
1926 CBigNum(nBestChainTrust).ToString().c_str(),
1927 nBestBlockTrust.Get64(),
1928 DateTimeStrFormat("%x %H:%M:%S", pindexBest->GetBlockTime()).c_str());
1930 // Check the version of the last 100 blocks to see if we need to upgrade:
1931 if (!fIsInitialDownload)
1934 const CBlockIndex* pindex = pindexBest;
1935 for (int i = 0; i < 100 && pindex != NULL; i++)
1937 if (pindex->nVersion > CBlock::CURRENT_VERSION)
1939 pindex = pindex->pprev;
1942 printf("SetBestChain: %d of last 100 blocks above version %d\n", nUpgraded, CBlock::CURRENT_VERSION);
1943 if (nUpgraded > 100/2)
1944 // strMiscWarning is read by GetWarnings(), called by Qt and the JSON-RPC code to warn the user:
1945 strMiscWarning = _("Warning: This version is obsolete, upgrade required!");
1948 std::string strCmd = GetArg("-blocknotify", "");
1950 if (!fIsInitialDownload && !strCmd.empty())
1952 boost::replace_all(strCmd, "%s", hashBestChain.GetHex());
1953 boost::thread t(runCommand, strCmd); // thread runs free
1959 // ppcoin: total coin age spent in transaction, in the unit of coin-days.
1960 // Only those coins meeting minimum age requirement counts. As those
1961 // transactions not in main chain are not currently indexed so we
1962 // might not find out about their coin age. Older transactions are
1963 // guaranteed to be in main chain by sync-checkpoint. This rule is
1964 // introduced to help nodes establish a consistent view of the coin
1965 // age (trust score) of competing branches.
1966 bool CTransaction::GetCoinAge(CTxDB& txdb, uint64& nCoinAge) const
1968 CBigNum bnCentSecond = 0; // coin age in the unit of cent-seconds
1974 BOOST_FOREACH(const CTxIn& txin, vin)
1976 // First try finding the previous transaction in database
1977 CTransaction txPrev;
1979 if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
1980 continue; // previous transaction not in main chain
1981 if (nTime < txPrev.nTime)
1982 return false; // Transaction timestamp violation
1984 // Read block header
1986 if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
1987 return false; // unable to read block of previous transaction
1988 if (block.GetBlockTime() + nStakeMinAge > nTime)
1989 continue; // only count coins meeting min age requirement
1991 int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
1992 bnCentSecond += CBigNum(nValueIn) * (nTime-txPrev.nTime) / CENT;
1994 if (fDebug && GetBoolArg("-printcoinage"))
1995 printf("coin age nValueIn=%"PRI64d" nTimeDiff=%d bnCentSecond=%s\n", nValueIn, nTime - txPrev.nTime, bnCentSecond.ToString().c_str());
1998 CBigNum bnCoinDay = bnCentSecond * CENT / COIN / (24 * 60 * 60);
1999 if (fDebug && GetBoolArg("-printcoinage"))
2000 printf("coin age bnCoinDay=%s\n", bnCoinDay.ToString().c_str());
2001 nCoinAge = bnCoinDay.getuint64();
2005 // ppcoin: total coin age spent in block, in the unit of coin-days.
2006 bool CBlock::GetCoinAge(uint64& nCoinAge) const
2011 BOOST_FOREACH(const CTransaction& tx, vtx)
2014 if (tx.GetCoinAge(txdb, nTxCoinAge))
2015 nCoinAge += nTxCoinAge;
2020 if (nCoinAge == 0) // block coin age minimum 1 coin-day
2022 if (fDebug && GetBoolArg("-printcoinage"))
2023 printf("block coin age total nCoinDays=%"PRI64d"\n", nCoinAge);
2027 bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
2029 // Check for duplicate
2030 uint256 hash = GetHash();
2031 if (mapBlockIndex.count(hash))
2032 return error("AddToBlockIndex() : %s already exists", hash.ToString().substr(0,20).c_str());
2034 // Construct new block index object
2035 CBlockIndex* pindexNew = new CBlockIndex(nFile, nBlockPos, *this);
2037 return error("AddToBlockIndex() : new CBlockIndex failed");
2038 pindexNew->phashBlock = &hash;
2039 map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(hashPrevBlock);
2040 if (miPrev != mapBlockIndex.end())
2042 pindexNew->pprev = (*miPrev).second;
2043 pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
2046 // ppcoin: compute chain trust score
2047 pindexNew->nChainTrust = (pindexNew->pprev ? pindexNew->pprev->nChainTrust : 0) + pindexNew->GetBlockTrust();
2049 // ppcoin: compute stake entropy bit for stake modifier
2050 if (!pindexNew->SetStakeEntropyBit(GetStakeEntropyBit(pindexNew->nTime)))
2051 return error("AddToBlockIndex() : SetStakeEntropyBit() failed");
2053 // ppcoin: record proof-of-stake hash value
2054 if (pindexNew->IsProofOfStake())
2056 if (!mapProofOfStake.count(hash))
2057 return error("AddToBlockIndex() : hashProofOfStake not found in map");
2058 pindexNew->hashProofOfStake = mapProofOfStake[hash];
2061 // ppcoin: compute stake modifier
2062 uint64 nStakeModifier = 0;
2063 bool fGeneratedStakeModifier = false;
2064 if (!ComputeNextStakeModifier(pindexNew->pprev, nStakeModifier, fGeneratedStakeModifier))
2065 return error("AddToBlockIndex() : ComputeNextStakeModifier() failed");
2066 pindexNew->SetStakeModifier(nStakeModifier, fGeneratedStakeModifier);
2067 pindexNew->nStakeModifierChecksum = GetStakeModifierChecksum(pindexNew);
2068 if (!CheckStakeModifierCheckpoints(pindexNew->nHeight, pindexNew->nStakeModifierChecksum))
2069 return error("AddToBlockIndex() : Rejected by stake modifier checkpoint height=%d, modifier=0x%016"PRI64x, pindexNew->nHeight, nStakeModifier);
2071 // Add to mapBlockIndex
2072 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
2073 if (pindexNew->IsProofOfStake())
2074 setStakeSeen.insert(make_pair(pindexNew->prevoutStake, pindexNew->nStakeTime));
2075 pindexNew->phashBlock = &((*mi).first);
2077 // Write to disk block index
2079 if (!txdb.TxnBegin())
2081 txdb.WriteBlockIndex(CDiskBlockIndex(pindexNew));
2082 if (!txdb.TxnCommit())
2086 if (pindexNew->nChainTrust > nBestChainTrust)
2087 if (!SetBestChain(txdb, pindexNew))
2090 if (pindexNew == pindexBest)
2092 // Notify UI to display prev block's coinbase if it was ours
2093 static uint256 hashPrevBestCoinBase;
2094 UpdatedTransaction(hashPrevBestCoinBase);
2095 hashPrevBestCoinBase = vtx[0].GetHash();
2098 uiInterface.NotifyBlocksChanged();
2105 bool CBlock::CheckBlock(bool fCheckPOW, bool fCheckMerkleRoot, bool fCheckSig) const
2107 // These are checks that are independent of context
2108 // that can be verified before saving an orphan block.
2111 if (vtx.empty() || vtx.size() > MAX_BLOCK_SIZE || ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
2112 return DoS(100, error("CheckBlock() : size limits failed"));
2114 // Check proof of work matches claimed amount
2115 if (fCheckPOW && IsProofOfWork() && !CheckProofOfWork(GetHash(), nBits))
2116 return DoS(50, error("CheckBlock() : proof of work failed"));
2119 if (GetBlockTime() > GetAdjustedTime() + nMaxClockDrift)
2120 return error("CheckBlock() : block timestamp too far in the future");
2122 // First transaction must be coinbase, the rest must not be
2123 if (vtx.empty() || !vtx[0].IsCoinBase())
2124 return DoS(100, error("CheckBlock() : first tx is not coinbase"));
2125 for (unsigned int i = 1; i < vtx.size(); i++)
2126 if (vtx[i].IsCoinBase())
2127 return DoS(100, error("CheckBlock() : more than one coinbase"));
2129 // Check coinbase timestamp
2130 if (GetBlockTime() > (int64)vtx[0].nTime + nMaxClockDrift)
2131 return DoS(50, error("CheckBlock() : coinbase timestamp is too early"));
2133 if (IsProofOfStake())
2135 // Coinbase output should be empty if proof-of-stake block
2136 if (vtx[0].vout.size() != 1 || !vtx[0].vout[0].IsEmpty())
2137 return DoS(100, error("CheckBlock() : coinbase output not empty for proof-of-stake block"));
2139 // Second transaction must be coinstake, the rest must not be
2140 if (vtx.empty() || !vtx[1].IsCoinStake())
2141 return DoS(100, error("CheckBlock() : second tx is not coinstake"));
2142 for (unsigned int i = 2; i < vtx.size(); i++)
2143 if (vtx[i].IsCoinStake())
2144 return DoS(100, error("CheckBlock() : more than one coinstake"));
2146 // Check coinstake timestamp
2147 if (!CheckCoinStakeTimestamp(GetBlockTime(), (int64)vtx[1].nTime))
2148 return DoS(50, error("CheckBlock() : coinstake timestamp violation nTimeBlock=%"PRI64d" nTimeTx=%u", GetBlockTime(), vtx[1].nTime));
2150 // NovaCoin: check proof-of-stake block signature
2151 if (fCheckSig && !CheckBlockSignature(true))
2152 return DoS(100, error("CheckBlock() : bad proof-of-stake block signature"));
2156 int64 nReward = GetProofOfWorkReward(nBits);
2157 // Check coinbase reward
2158 if (vtx[0].GetValueOut() > nReward)
2159 return DoS(50, error("CheckBlock() : coinbase reward exceeded (actual=%"PRI64d" vs calculated=%"PRI64d")",
2160 vtx[0].GetValueOut(),
2163 // Should we check proof-of-work block signature or not?
2165 // * Always skip on TestNet
2166 // * Perform checking for the first 9689 blocks
2167 // * Perform checking since last checkpoint until 20 Sep 2013 (will be removed after)
2169 if(!fTestNet && fCheckSig)
2171 bool checkEntropySig = (GetBlockTime() < ENTROPY_SWITCH_TIME);
2173 // NovaCoin: check proof-of-work block signature
2174 if (checkEntropySig && !CheckBlockSignature(false))
2175 return DoS(100, error("CheckBlock() : bad proof-of-work block signature"));
2179 // Check transactions
2180 BOOST_FOREACH(const CTransaction& tx, vtx)
2182 if (!tx.CheckTransaction())
2183 return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed"));
2185 // ppcoin: check transaction timestamp
2186 if (GetBlockTime() < (int64)tx.nTime)
2187 return DoS(50, error("CheckBlock() : block timestamp earlier than transaction timestamp"));
2190 // Check for duplicate txids. This is caught by ConnectInputs(),
2191 // but catching it earlier avoids a potential DoS attack:
2192 set<uint256> uniqueTx;
2193 BOOST_FOREACH(const CTransaction& tx, vtx)
2195 uniqueTx.insert(tx.GetHash());
2197 if (uniqueTx.size() != vtx.size())
2198 return DoS(100, error("CheckBlock() : duplicate transaction"));
2200 unsigned int nSigOps = 0;
2201 BOOST_FOREACH(const CTransaction& tx, vtx)
2203 nSigOps += tx.GetLegacySigOpCount();
2205 if (nSigOps > MAX_BLOCK_SIGOPS)
2206 return DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"));
2208 // Check merkle root
2209 if (fCheckMerkleRoot && hashMerkleRoot != BuildMerkleTree())
2210 return DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
2216 bool CBlock::AcceptBlock()
2218 // Check for duplicate
2219 uint256 hash = GetHash();
2220 if (mapBlockIndex.count(hash))
2221 return error("AcceptBlock() : block already in mapBlockIndex");
2223 // Get prev block index
2224 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
2225 if (mi == mapBlockIndex.end())
2226 return DoS(10, error("AcceptBlock() : prev block not found"));
2227 CBlockIndex* pindexPrev = (*mi).second;
2228 int nHeight = pindexPrev->nHeight+1;
2230 // Check proof-of-work or proof-of-stake
2231 if (nBits != GetNextTargetRequired(pindexPrev, IsProofOfStake()))
2232 return DoS(100, error("AcceptBlock() : incorrect %s", IsProofOfWork() ? "proof-of-work" : "proof-of-stake"));
2234 // Check timestamp against prev
2235 if (GetBlockTime() <= pindexPrev->GetMedianTimePast() || GetBlockTime() + nMaxClockDrift < pindexPrev->GetBlockTime())
2236 return error("AcceptBlock() : block's timestamp is too early");
2238 // Check that all transactions are finalized
2239 BOOST_FOREACH(const CTransaction& tx, vtx)
2240 if (!tx.IsFinal(nHeight, GetBlockTime()))
2241 return DoS(10, error("AcceptBlock() : contains a non-final transaction"));
2243 // Check that the block chain matches the known block chain up to a checkpoint
2244 if (!Checkpoints::CheckHardened(nHeight, hash))
2245 return DoS(100, error("AcceptBlock() : rejected by hardened checkpoint lock-in at %d", nHeight));
2247 bool cpSatisfies = Checkpoints::CheckSync(hash, pindexPrev);
2249 // Check that the block satisfies synchronized checkpoint
2250 if (CheckpointsMode == Checkpoints::STRICT && !cpSatisfies)
2251 return error("AcceptBlock() : rejected by synchronized checkpoint");
2253 if (CheckpointsMode == Checkpoints::ADVISORY && !cpSatisfies)
2254 strMiscWarning = _("WARNING: syncronized checkpoint violation detected, but skipped!");
2256 // Enforce rule that the coinbase starts with serialized block height
2257 CScript expect = CScript() << nHeight;
2258 if (vtx[0].vin[0].scriptSig.size() < expect.size() ||
2259 !std::equal(expect.begin(), expect.end(), vtx[0].vin[0].scriptSig.begin()))
2260 return DoS(100, error("AcceptBlock() : block height mismatch in coinbase"));
2262 // Write block to history file
2263 if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK, CLIENT_VERSION)))
2264 return error("AcceptBlock() : out of disk space");
2265 unsigned int nFile = -1;
2266 unsigned int nBlockPos = 0;
2267 if (!WriteToDisk(nFile, nBlockPos))
2268 return error("AcceptBlock() : WriteToDisk failed");
2269 if (!AddToBlockIndex(nFile, nBlockPos))
2270 return error("AcceptBlock() : AddToBlockIndex failed");
2272 // Relay inventory, but don't relay old inventory during initial block download
2273 int nBlockEstimate = Checkpoints::GetTotalBlocksEstimate();
2274 if (hashBestChain == hash)
2277 BOOST_FOREACH(CNode* pnode, vNodes)
2278 if (nBestHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : nBlockEstimate))
2279 pnode->PushInventory(CInv(MSG_BLOCK, hash));
2282 // ppcoin: check pending sync-checkpoint
2283 Checkpoints::AcceptPendingSyncCheckpoint();
2288 uint256 CBlockIndex::GetBlockTrust() const
2291 bnTarget.SetCompact(nBits);
2297 if (!fTestNet && GetBlockTime() < CHAINCHECKS_SWITCH_TIME)
2298 return (IsProofOfStake()? ((CBigNum(1)<<256) / (bnTarget+1)).getuint256() : 1);
2302 // Calculate work amount for block
2303 uint256 nPoWTrust = (CBigNum(nPoWBase) / (bnTarget+1)).getuint256();
2305 // Set nPowTrust to 1 if we are checking PoS block or PoW difficulty is too low
2306 nPoWTrust = (IsProofOfStake() || nPoWTrust < 1) ? 1 : nPoWTrust;
2308 // Return nPoWTrust for the first 12 blocks
2309 if (pprev == NULL || pprev->nHeight < 12)
2312 const CBlockIndex* currentIndex = pprev;
2314 if(IsProofOfStake())
2316 CBigNum bnNewTrust = (CBigNum(1)<<256) / (bnTarget+1);
2318 // Return 1/3 of score if parent block is not the PoW block
2319 if (!pprev->IsProofOfWork())
2320 return (bnNewTrust / 3).getuint256();
2324 // Check last 12 blocks type
2325 while (pprev->nHeight - currentIndex->nHeight < 12)
2327 if (currentIndex->IsProofOfWork())
2329 currentIndex = currentIndex->pprev;
2332 // Return 1/3 of score if less than 3 PoW blocks found
2334 return (bnNewTrust / 3).getuint256();
2336 return bnNewTrust.getuint256();
2340 CBigNum bnLastBlockTrust = CBigNum(pprev->nChainTrust - pprev->pprev->nChainTrust);
2342 // Return nPoWTrust + 2/3 of previous block score if two parent blocks are not PoS blocks
2343 if (!(pprev->IsProofOfStake() && pprev->pprev->IsProofOfStake()))
2344 return nPoWTrust + (2 * bnLastBlockTrust / 3).getuint256();
2348 // Check last 12 blocks type
2349 while (pprev->nHeight - currentIndex->nHeight < 12)
2351 if (currentIndex->IsProofOfStake())
2353 currentIndex = currentIndex->pprev;
2356 // Return nPoWTrust + 2/3 of previous block score if less than 7 PoS blocks found
2358 return nPoWTrust + (2 * bnLastBlockTrust / 3).getuint256();
2360 bnTarget.SetCompact(pprev->nBits);
2365 CBigNum bnNewTrust = (CBigNum(1)<<256) / (bnTarget+1);
2367 // Return nPoWTrust + full trust score for previous block nBits
2368 return nPoWTrust + bnNewTrust.getuint256();
2372 bool CBlockIndex::IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned int nRequired, unsigned int nToCheck)
2374 unsigned int nFound = 0;
2375 for (unsigned int i = 0; i < nToCheck && nFound < nRequired && pstart != NULL; i++)
2377 if (pstart->nVersion >= minVersion)
2379 pstart = pstart->pprev;
2381 return (nFound >= nRequired);
2384 bool ProcessBlock(CNode* pfrom, CBlock* pblock)
2386 // Check for duplicate
2387 uint256 hash = pblock->GetHash();
2388 if (mapBlockIndex.count(hash))
2389 return error("ProcessBlock() : already have block %d %s", mapBlockIndex[hash]->nHeight, hash.ToString().substr(0,20).c_str());
2390 if (mapOrphanBlocks.count(hash))
2391 return error("ProcessBlock() : already have block (orphan) %s", hash.ToString().substr(0,20).c_str());
2393 // ppcoin: check proof-of-stake
2394 // Limited duplicity on stake: prevents block flood attack
2395 // Duplicate stake allowed only when there is orphan child block
2396 if (pblock->IsProofOfStake() && setStakeSeen.count(pblock->GetProofOfStake()) && !mapOrphanBlocksByPrev.count(hash) && !Checkpoints::WantedByPendingSyncCheckpoint(hash))
2397 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());
2399 // Preliminary checks
2400 if (!pblock->CheckBlock())
2401 return error("ProcessBlock() : CheckBlock FAILED");
2403 // ppcoin: verify hash target and signature of coinstake tx
2404 if (pblock->IsProofOfStake())
2406 uint256 hashProofOfStake = 0, targetProofOfStake = 0;
2407 if (!CheckProofOfStake(pblock->vtx[1], pblock->nBits, hashProofOfStake, targetProofOfStake))
2409 printf("WARNING: ProcessBlock(): check proof-of-stake failed for block %s\n", hash.ToString().c_str());
2410 return false; // do not error here as we expect this during initial block download
2412 if (!mapProofOfStake.count(hash)) // add to mapProofOfStake
2413 mapProofOfStake.insert(make_pair(hash, hashProofOfStake));
2416 CBlockIndex* pcheckpoint = Checkpoints::GetLastSyncCheckpoint();
2417 if (pcheckpoint && pblock->hashPrevBlock != hashBestChain && !Checkpoints::WantedByPendingSyncCheckpoint(hash))
2419 // Extra checks to prevent "fill up memory by spamming with bogus blocks"
2420 int64 deltaTime = pblock->GetBlockTime() - pcheckpoint->nTime;
2422 bnNewBlock.SetCompact(pblock->nBits);
2425 if (pblock->IsProofOfStake())
2426 bnRequired.SetCompact(ComputeMinStake(GetLastBlockIndex(pcheckpoint, true)->nBits, deltaTime, pblock->nTime));
2428 bnRequired.SetCompact(ComputeMinWork(GetLastBlockIndex(pcheckpoint, false)->nBits, deltaTime));
2430 if (bnNewBlock > bnRequired)
2433 pfrom->Misbehaving(100);
2434 return error("ProcessBlock() : block with too little %s", pblock->IsProofOfStake()? "proof-of-stake" : "proof-of-work");
2438 // ppcoin: ask for pending sync-checkpoint if any
2439 if (!IsInitialBlockDownload())
2440 Checkpoints::AskForPendingSyncCheckpoint(pfrom);
2442 // If don't already have its previous block, shunt it off to holding area until we get it
2443 if (!mapBlockIndex.count(pblock->hashPrevBlock))
2445 printf("ProcessBlock: ORPHAN BLOCK, prev=%s\n", pblock->hashPrevBlock.ToString().substr(0,20).c_str());
2446 CBlock* pblock2 = new CBlock(*pblock);
2447 // ppcoin: check proof-of-stake
2448 if (pblock2->IsProofOfStake())
2450 // Limited duplicity on stake: prevents block flood attack
2451 // Duplicate stake allowed only when there is orphan child block
2452 if (setStakeSeenOrphan.count(pblock2->GetProofOfStake()) && !mapOrphanBlocksByPrev.count(hash) && !Checkpoints::WantedByPendingSyncCheckpoint(hash))
2453 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());
2455 setStakeSeenOrphan.insert(pblock2->GetProofOfStake());
2457 mapOrphanBlocks.insert(make_pair(hash, pblock2));
2458 mapOrphanBlocksByPrev.insert(make_pair(pblock2->hashPrevBlock, pblock2));
2460 // Ask this guy to fill in what we're missing
2463 pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(pblock2));
2464 // ppcoin: getblocks may not obtain the ancestor block rejected
2465 // earlier by duplicate-stake check so we ask for it again directly
2466 if (!IsInitialBlockDownload())
2467 pfrom->AskFor(CInv(MSG_BLOCK, WantedByOrphan(pblock2)));
2473 if (!pblock->AcceptBlock())
2474 return error("ProcessBlock() : AcceptBlock FAILED");
2476 // Recursively process any orphan blocks that depended on this one
2477 vector<uint256> vWorkQueue;
2478 vWorkQueue.push_back(hash);
2479 for (unsigned int i = 0; i < vWorkQueue.size(); i++)
2481 uint256 hashPrev = vWorkQueue[i];
2482 for (multimap<uint256, CBlock*>::iterator mi = mapOrphanBlocksByPrev.lower_bound(hashPrev);
2483 mi != mapOrphanBlocksByPrev.upper_bound(hashPrev);
2486 CBlock* pblockOrphan = (*mi).second;
2487 if (pblockOrphan->AcceptBlock())
2488 vWorkQueue.push_back(pblockOrphan->GetHash());
2489 mapOrphanBlocks.erase(pblockOrphan->GetHash());
2490 setStakeSeenOrphan.erase(pblockOrphan->GetProofOfStake());
2491 delete pblockOrphan;
2493 mapOrphanBlocksByPrev.erase(hashPrev);
2496 printf("ProcessBlock: ACCEPTED\n");
2498 // ppcoin: if responsible for sync-checkpoint send it
2499 if (pfrom && !CSyncCheckpoint::strMasterPrivKey.empty())
2500 Checkpoints::SendSyncCheckpoint(Checkpoints::AutoSelectSyncCheckpoint());
2505 // ppcoin: sign block
2506 bool CBlock::SignBlock(const CKeyStore& keystore)
2508 vector<valtype> vSolutions;
2509 txnouttype whichType;
2511 if(!IsProofOfStake())
2513 for(unsigned int i = 0; i < vtx[0].vout.size(); i++)
2515 const CTxOut& txout = vtx[0].vout[i];
2517 if (!Solver(txout.scriptPubKey, whichType, vSolutions))
2520 if (whichType == TX_PUBKEY)
2523 valtype& vchPubKey = vSolutions[0];
2526 if (!keystore.GetKey(Hash160(vchPubKey), key))
2528 if (key.GetPubKey() != vchPubKey)
2530 if(!key.Sign(GetHash(), vchBlockSig))
2539 const CTxOut& txout = vtx[1].vout[1];
2541 if (!Solver(txout.scriptPubKey, whichType, vSolutions))
2544 if (whichType == TX_PUBKEY)
2547 valtype& vchPubKey = vSolutions[0];
2550 if (!keystore.GetKey(Hash160(vchPubKey), key))
2552 if (key.GetPubKey() != vchPubKey)
2555 return key.Sign(GetHash(), vchBlockSig);
2559 printf("Sign failed\n");
2563 // ppcoin: check block signature
2564 bool CBlock::CheckBlockSignature(bool fProofOfStake) const
2566 if (GetHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet))
2567 return vchBlockSig.empty();
2569 vector<valtype> vSolutions;
2570 txnouttype whichType;
2574 const CTxOut& txout = vtx[1].vout[1];
2576 if (!Solver(txout.scriptPubKey, whichType, vSolutions))
2578 if (whichType == TX_PUBKEY)
2580 valtype& vchPubKey = vSolutions[0];
2582 if (!key.SetPubKey(vchPubKey))
2584 if (vchBlockSig.empty())
2586 return key.Verify(GetHash(), vchBlockSig);
2591 for(unsigned int i = 0; i < vtx[0].vout.size(); i++)
2593 const CTxOut& txout = vtx[0].vout[i];
2595 if (!Solver(txout.scriptPubKey, whichType, vSolutions))
2598 if (whichType == TX_PUBKEY)
2601 valtype& vchPubKey = vSolutions[0];
2603 if (!key.SetPubKey(vchPubKey))
2605 if (vchBlockSig.empty())
2607 if(!key.Verify(GetHash(), vchBlockSig))
2617 bool CheckDiskSpace(uint64 nAdditionalBytes)
2619 uint64 nFreeBytesAvailable = filesystem::space(GetDataDir()).available;
2621 // Check for nMinDiskSpace bytes (currently 50MB)
2622 if (nFreeBytesAvailable < nMinDiskSpace + nAdditionalBytes)
2625 string strMessage = _("Warning: Disk space is low!");
2626 strMiscWarning = strMessage;
2627 printf("*** %s\n", strMessage.c_str());
2628 uiInterface.ThreadSafeMessageBox(strMessage, "NovaCoin", CClientUIInterface::OK | CClientUIInterface::ICON_EXCLAMATION | CClientUIInterface::MODAL);
2635 static filesystem::path BlockFilePath(unsigned int nFile)
2637 string strBlockFn = strprintf("blk%04u.dat", nFile);
2638 return GetDataDir() / strBlockFn;
2641 FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode)
2643 if ((nFile < 1) || (nFile == (unsigned int) -1))
2645 FILE* file = fopen(BlockFilePath(nFile).string().c_str(), pszMode);
2648 if (nBlockPos != 0 && !strchr(pszMode, 'a') && !strchr(pszMode, 'w'))
2650 if (fseek(file, nBlockPos, SEEK_SET) != 0)
2659 static unsigned int nCurrentBlockFile = 1;
2661 FILE* AppendBlockFile(unsigned int& nFileRet)
2666 FILE* file = OpenBlockFile(nCurrentBlockFile, 0, "ab");
2669 if (fseek(file, 0, SEEK_END) != 0)
2671 // FAT32 file size max 4GB, fseek and ftell max 2GB, so we must stay under 2GB
2672 if (ftell(file) < (long)(0x7F000000 - MAX_SIZE))
2674 nFileRet = nCurrentBlockFile;
2678 nCurrentBlockFile++;
2682 bool LoadBlockIndex(bool fAllowNew)
2684 CBigNum bnTrustedModulus;
2688 pchMessageStart[0] = 0xcd;
2689 pchMessageStart[1] = 0xf2;
2690 pchMessageStart[2] = 0xc0;
2691 pchMessageStart[3] = 0xef;
2693 bnTrustedModulus.SetHex("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");
2694 bnProofOfWorkLimit = bnProofOfWorkLimitTestNet; // 16 bits PoW target limit for testnet
2695 nStakeMinAge = 2 * 60 * 60; // test net min age is 2 hours
2696 nModifierInterval = 20 * 60; // test modifier interval is 20 minutes
2697 nCoinbaseMaturity = 10; // test maturity is 10 blocks
2698 nStakeTargetSpacing = 5 * 60; // test block spacing is 5 minutes
2702 bnTrustedModulus.SetHex("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");
2705 // Set up the Zerocoin Params object
2706 ZCParams = new libzerocoin::Params(bnTrustedModulus);
2712 if (!txdb.LoadBlockIndex())
2717 // Init with genesis block
2719 if (mapBlockIndex.empty())
2728 //CBlock(hash=00000a060336cbb72fe969666d337b87198b1add2abaa59cca226820b32933a4, ver=1, hashPrevBlock=0000000000000000000000000000000000000000000000000000000000000000, hashMerkleRoot=4cb33b3b6a861dcbc685d3e614a9cafb945738d6833f182855679f2fad02057b, nTime=1360105017, nBits=1e0fffff, nNonce=1575379, vtx=1, vchBlockSig=)
2729 // Coinbase(hash=4cb33b3b6a, nTime=1360105017, ver=1, vin.size=1, vout.size=1, nLockTime=0)
2730 // CTxIn(COutPoint(0000000000, 4294967295), coinbase 04ffff001d020f274468747470733a2f2f626974636f696e74616c6b2e6f72672f696e6465782e7068703f746f7069633d3133343137392e6d736731353032313936236d736731353032313936)
2732 // vMerkleTree: 4cb33b3b6a
2736 //CBlock(hash=0000c763e402f2436da9ed36c7286f62c3f6e5dbafce9ff289bd43d7459327eb, ver=1, hashPrevBlock=0000000000000000000000000000000000000000000000000000000000000000, hashMerkleRoot=4cb33b3b6a861dcbc685d3e614a9cafb945738d6833f182855679f2fad02057b, nTime=1360105017, nBits=1f00ffff, nNonce=46534, vtx=1, vchBlockSig=)
2737 // Coinbase(hash=4cb33b3b6a, nTime=1360105017, ver=1, vin.size=1, vout.size=1, nLockTime=0)
2738 // CTxIn(COutPoint(0000000000, 4294967295), coinbase 04ffff001d020f274468747470733a2f2f626974636f696e74616c6b2e6f72672f696e6465782e7068703f746f7069633d3133343137392e6d736731353032313936236d736731353032313936)
2740 // vMerkleTree: 4cb33b3b6a
2742 const char* pszTimestamp = "https://bitcointalk.org/index.php?topic=134179.msg1502196#msg1502196";
2744 txNew.nTime = 1360105017;
2745 txNew.vin.resize(1);
2746 txNew.vout.resize(1);
2747 txNew.vin[0].scriptSig = CScript() << 486604799 << CBigNum(9999) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
2748 txNew.vout[0].SetEmpty();
2750 block.vtx.push_back(txNew);
2751 block.hashPrevBlock = 0;
2752 block.hashMerkleRoot = block.BuildMerkleTree();
2754 block.nTime = 1360105017;
2755 block.nBits = bnProofOfWorkLimit.GetCompact();
2756 block.nNonce = !fTestNet ? 1575379 : 46534;
2759 assert(block.hashMerkleRoot == uint256("0x4cb33b3b6a861dcbc685d3e614a9cafb945738d6833f182855679f2fad02057b"));
2761 assert(block.GetHash() == (!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet));
2762 assert(block.CheckBlock());
2764 // Start new block file
2766 unsigned int nBlockPos;
2767 if (!block.WriteToDisk(nFile, nBlockPos))
2768 return error("LoadBlockIndex() : writing genesis block to disk failed");
2769 if (!block.AddToBlockIndex(nFile, nBlockPos))
2770 return error("LoadBlockIndex() : genesis block not accepted");
2772 // ppcoin: initialize synchronized checkpoint
2773 if (!Checkpoints::WriteSyncCheckpoint((!fTestNet ? hashGenesisBlock : hashGenesisBlockTestNet)))
2774 return error("LoadBlockIndex() : failed to init sync checkpoint");
2777 // ppcoin: if checkpoint master key changed must reset sync-checkpoint
2780 string strPubKey = "";
2781 if (!txdb.ReadCheckpointPubKey(strPubKey) || strPubKey != CSyncCheckpoint::strMasterPubKey)
2783 // write checkpoint master key to db
2785 if (!txdb.WriteCheckpointPubKey(CSyncCheckpoint::strMasterPubKey))
2786 return error("LoadBlockIndex() : failed to write new checkpoint master key to db");
2787 if (!txdb.TxnCommit())
2788 return error("LoadBlockIndex() : failed to commit new checkpoint master key to db");
2789 if ((!fTestNet) && !Checkpoints::ResetSyncCheckpoint())
2790 return error("LoadBlockIndex() : failed to reset sync-checkpoint");
2803 void PrintBlockTree()
2805 // pre-compute tree structure
2806 map<CBlockIndex*, vector<CBlockIndex*> > mapNext;
2807 for (map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
2809 CBlockIndex* pindex = (*mi).second;
2810 mapNext[pindex->pprev].push_back(pindex);
2812 //while (rand() % 3 == 0)
2813 // mapNext[pindex->pprev].push_back(pindex);
2816 vector<pair<int, CBlockIndex*> > vStack;
2817 vStack.push_back(make_pair(0, pindexGenesisBlock));
2820 while (!vStack.empty())
2822 int nCol = vStack.back().first;
2823 CBlockIndex* pindex = vStack.back().second;
2826 // print split or gap
2827 if (nCol > nPrevCol)
2829 for (int i = 0; i < nCol-1; i++)
2833 else if (nCol < nPrevCol)
2835 for (int i = 0; i < nCol; i++)
2842 for (int i = 0; i < nCol; i++)
2847 block.ReadFromDisk(pindex);
2848 printf("%d (%u,%u) %s %08x %s mint %7s tx %"PRIszu"",
2852 block.GetHash().ToString().c_str(),
2854 DateTimeStrFormat("%x %H:%M:%S", block.GetBlockTime()).c_str(),
2855 FormatMoney(pindex->nMint).c_str(),
2858 PrintWallets(block);
2860 // put the main time-chain first
2861 vector<CBlockIndex*>& vNext = mapNext[pindex];
2862 for (unsigned int i = 0; i < vNext.size(); i++)
2864 if (vNext[i]->pnext)
2866 swap(vNext[0], vNext[i]);
2872 for (unsigned int i = 0; i < vNext.size(); i++)
2873 vStack.push_back(make_pair(nCol+i, vNext[i]));
2877 bool LoadExternalBlockFile(FILE* fileIn)
2879 int64 nStart = GetTimeMillis();
2885 CAutoFile blkdat(fileIn, SER_DISK, CLIENT_VERSION);
2886 unsigned int nPos = 0;
2887 while (nPos != (unsigned int)-1 && blkdat.good() && !fRequestShutdown)
2889 unsigned char pchData[65536];
2891 fseek(blkdat, nPos, SEEK_SET);
2892 int nRead = fread(pchData, 1, sizeof(pchData), blkdat);
2895 nPos = (unsigned int)-1;
2898 void* nFind = memchr(pchData, pchMessageStart[0], nRead+1-sizeof(pchMessageStart));
2901 if (memcmp(nFind, pchMessageStart, sizeof(pchMessageStart))==0)
2903 nPos += ((unsigned char*)nFind - pchData) + sizeof(pchMessageStart);
2906 nPos += ((unsigned char*)nFind - pchData) + 1;
2909 nPos += sizeof(pchData) - sizeof(pchMessageStart) + 1;
2910 } while(!fRequestShutdown);
2911 if (nPos == (unsigned int)-1)
2913 fseek(blkdat, nPos, SEEK_SET);
2916 if (nSize > 0 && nSize <= MAX_BLOCK_SIZE)
2920 if (ProcessBlock(NULL,&block))
2928 catch (std::exception &e) {
2929 printf("%s() : Deserialize or I/O error caught during load\n",
2930 __PRETTY_FUNCTION__);
2933 printf("Loaded %i blocks from external file in %"PRI64d"ms\n", nLoaded, GetTimeMillis() - nStart);
2937 //////////////////////////////////////////////////////////////////////////////
2942 extern map<uint256, CAlert> mapAlerts;
2943 extern CCriticalSection cs_mapAlerts;
2945 extern string strMintMessage;
2946 extern string strMintWarning;
2948 string GetWarnings(string strFor)
2951 string strStatusBar;
2954 if (GetBoolArg("-testsafemode"))
2957 // ppcoin: wallet lock warning for minting
2958 if (strMintWarning != "")
2961 strStatusBar = strMintWarning;
2964 // Misc warnings like out of disk space and clock is wrong
2965 if (strMiscWarning != "")
2968 strStatusBar = strMiscWarning;
2971 // * Should not enter safe mode for longer invalid chain
2972 // * If sync-checkpoint is too old do not enter safe mode
2973 // * Display warning only in the STRICT mode
2974 if (CheckpointsMode == Checkpoints::STRICT && Checkpoints::IsSyncCheckpointTooOld(60 * 60 * 24 * 10) &&
2975 !fTestNet && !IsInitialBlockDownload())
2978 strStatusBar = _("WARNING: Checkpoint is too old. Wait for block chain to download, or notify developers.");
2981 // ppcoin: if detected invalid checkpoint enter safe mode
2982 if (Checkpoints::hashInvalidCheckpoint != 0)
2985 strStatusBar = strRPC = _("WARNING: Invalid checkpoint found! Displayed transactions may not be correct! You may need to upgrade, or notify developers.");
2991 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
2993 const CAlert& alert = item.second;
2994 if (alert.AppliesToMe() && alert.nPriority > nPriority)
2996 nPriority = alert.nPriority;
2997 strStatusBar = alert.strStatusBar;
2998 if (nPriority > 1000)
2999 strRPC = strStatusBar;
3004 if (strFor == "statusbar")
3005 return strStatusBar;
3006 else if (strFor == "rpc")
3008 assert(!"GetWarnings() : invalid parameter");
3019 //////////////////////////////////////////////////////////////////////////////
3025 bool static AlreadyHave(CTxDB& txdb, const CInv& inv)
3031 bool txInMap = false;
3034 txInMap = (mempool.exists(inv.hash));
3037 mapOrphanTransactions.count(inv.hash) ||
3038 txdb.ContainsTx(inv.hash);
3042 return mapBlockIndex.count(inv.hash) ||
3043 mapOrphanBlocks.count(inv.hash);
3045 // Don't know what it is, just say we already got one
3052 // The message start string is designed to be unlikely to occur in normal data.
3053 // The characters are rarely used upper ASCII, not valid as UTF-8, and produce
3054 // a large 4-byte int at any alignment.
3055 unsigned char pchMessageStart[4] = { 0xe4, 0xe8, 0xe9, 0xe5 };
3057 bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
3059 static map<CService, CPubKey> mapReuseKey;
3060 RandAddSeedPerfmon();
3062 printf("received: %s (%"PRIszu" bytes)\n", strCommand.c_str(), vRecv.size());
3063 if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
3065 printf("dropmessagestest DROPPING RECV MESSAGE\n");
3069 if (strCommand == "version")
3071 // Each connection can only send one version message
3072 if (pfrom->nVersion != 0)
3074 pfrom->Misbehaving(1);
3082 vRecv >> pfrom->nVersion >> pfrom->nServices >> nTime >> addrMe;
3083 if (pfrom->nVersion < MIN_PROTO_VERSION)
3085 // Since February 20, 2012, the protocol is initiated at version 209,
3086 // and earlier versions are no longer supported
3087 printf("partner %s using obsolete version %i; disconnecting\n", pfrom->addr.ToString().c_str(), pfrom->nVersion);
3088 pfrom->fDisconnect = true;
3092 if (pfrom->nVersion == 10300)
3093 pfrom->nVersion = 300;
3095 vRecv >> addrFrom >> nNonce;
3097 vRecv >> pfrom->strSubVer;
3099 vRecv >> pfrom->nStartingHeight;
3101 if (pfrom->fInbound && addrMe.IsRoutable())
3103 pfrom->addrLocal = addrMe;
3107 // Disconnect if we connected to ourself
3108 if (nNonce == nLocalHostNonce && nNonce > 1)
3110 printf("connected to self at %s, disconnecting\n", pfrom->addr.ToString().c_str());
3111 pfrom->fDisconnect = true;
3115 // record my external IP reported by peer
3116 if (addrFrom.IsRoutable() && addrMe.IsRoutable())
3117 addrSeenByPeer = addrMe;
3119 // Be shy and don't send version until we hear
3120 if (pfrom->fInbound)
3121 pfrom->PushVersion();
3123 pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
3125 AddTimeData(pfrom->addr, nTime);
3128 pfrom->PushMessage("verack");
3129 pfrom->vSend.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
3131 if (!pfrom->fInbound)
3133 // Advertise our address
3134 if (!fNoListen && !IsInitialBlockDownload())
3136 CAddress addr = GetLocalAddress(&pfrom->addr);
3137 if (addr.IsRoutable())
3138 pfrom->PushAddress(addr);
3141 // Get recent addresses
3142 if (pfrom->fOneShot || pfrom->nVersion >= CADDR_TIME_VERSION || addrman.size() < 1000)
3144 pfrom->PushMessage("getaddr");
3145 pfrom->fGetAddr = true;
3147 addrman.Good(pfrom->addr);
3149 if (((CNetAddr)pfrom->addr) == (CNetAddr)addrFrom)
3151 addrman.Add(addrFrom, addrFrom);
3152 addrman.Good(addrFrom);
3156 // Ask the first connected node for block updates
3157 static int nAskedForBlocks = 0;
3158 if (!pfrom->fClient && !pfrom->fOneShot &&
3159 (pfrom->nStartingHeight > (nBestHeight - 144)) &&
3160 (pfrom->nVersion < NOBLKS_VERSION_START ||
3161 pfrom->nVersion >= NOBLKS_VERSION_END) &&
3162 (nAskedForBlocks < 1 || vNodes.size() <= 1))
3165 pfrom->PushGetBlocks(pindexBest, uint256(0));
3171 BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
3172 item.second.RelayTo(pfrom);
3175 // Relay sync-checkpoint
3177 LOCK(Checkpoints::cs_hashSyncCheckpoint);
3178 if (!Checkpoints::checkpointMessage.IsNull())
3179 Checkpoints::checkpointMessage.RelayTo(pfrom);
3182 pfrom->fSuccessfullyConnected = true;
3184 printf("receive version message: version %d, blocks=%d, us=%s, them=%s, peer=%s\n", pfrom->nVersion, pfrom->nStartingHeight, addrMe.ToString().c_str(), addrFrom.ToString().c_str(), pfrom->addr.ToString().c_str());
3186 cPeerBlockCounts.input(pfrom->nStartingHeight);
3188 // ppcoin: ask for pending sync-checkpoint if any
3189 if (!IsInitialBlockDownload())
3190 Checkpoints::AskForPendingSyncCheckpoint(pfrom);
3194 else if (pfrom->nVersion == 0)
3196 // Must have a version message before anything else
3197 pfrom->Misbehaving(1);
3202 else if (strCommand == "verack")
3204 pfrom->vRecv.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
3208 else if (strCommand == "addr")
3210 vector<CAddress> vAddr;
3213 // Don't want addr from older versions unless seeding
3214 if (pfrom->nVersion < CADDR_TIME_VERSION && addrman.size() > 1000)
3216 if (vAddr.size() > 1000)
3218 pfrom->Misbehaving(20);
3219 return error("message addr size() = %"PRIszu"", vAddr.size());
3222 // Store the new addresses
3223 vector<CAddress> vAddrOk;
3224 int64 nNow = GetAdjustedTime();
3225 int64 nSince = nNow - 10 * 60;
3226 BOOST_FOREACH(CAddress& addr, vAddr)
3230 if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
3231 addr.nTime = nNow - 5 * 24 * 60 * 60;
3232 pfrom->AddAddressKnown(addr);
3233 bool fReachable = IsReachable(addr);
3234 if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
3236 // Relay to a limited number of other nodes
3239 // Use deterministic randomness to send to the same nodes for 24 hours
3240 // at a time so the setAddrKnowns of the chosen nodes prevent repeats
3241 static uint256 hashSalt;
3243 hashSalt = GetRandHash();
3244 uint64 hashAddr = addr.GetHash();
3245 uint256 hashRand = hashSalt ^ (hashAddr<<32) ^ ((GetTime()+hashAddr)/(24*60*60));
3246 hashRand = Hash(BEGIN(hashRand), END(hashRand));
3247 multimap<uint256, CNode*> mapMix;
3248 BOOST_FOREACH(CNode* pnode, vNodes)
3250 if (pnode->nVersion < CADDR_TIME_VERSION)
3252 unsigned int nPointer;
3253 memcpy(&nPointer, &pnode, sizeof(nPointer));
3254 uint256 hashKey = hashRand ^ nPointer;
3255 hashKey = Hash(BEGIN(hashKey), END(hashKey));
3256 mapMix.insert(make_pair(hashKey, pnode));
3258 int nRelayNodes = fReachable ? 2 : 1; // limited relaying of addresses outside our network(s)
3259 for (multimap<uint256, CNode*>::iterator mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
3260 ((*mi).second)->PushAddress(addr);
3263 // Do not store addresses outside our network
3265 vAddrOk.push_back(addr);
3267 addrman.Add(vAddrOk, pfrom->addr, 2 * 60 * 60);
3268 if (vAddr.size() < 1000)
3269 pfrom->fGetAddr = false;
3270 if (pfrom->fOneShot)
3271 pfrom->fDisconnect = true;
3274 else if (strCommand == "inv")
3278 if (vInv.size() > MAX_INV_SZ)
3280 pfrom->Misbehaving(20);
3281 return error("message inv size() = %"PRIszu"", vInv.size());
3284 // find last block in inv vector
3285 unsigned int nLastBlock = (unsigned int)(-1);
3286 for (unsigned int nInv = 0; nInv < vInv.size(); nInv++) {
3287 if (vInv[vInv.size() - 1 - nInv].type == MSG_BLOCK) {
3288 nLastBlock = vInv.size() - 1 - nInv;
3293 for (unsigned int nInv = 0; nInv < vInv.size(); nInv++)
3295 const CInv &inv = vInv[nInv];
3299 pfrom->AddInventoryKnown(inv);
3301 bool fAlreadyHave = AlreadyHave(txdb, inv);
3303 printf(" got inventory: %s %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new");
3307 else if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash)) {
3308 pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(mapOrphanBlocks[inv.hash]));
3309 } else if (nInv == nLastBlock) {
3310 // In case we are on a very long side-chain, it is possible that we already have
3311 // the last block in an inv bundle sent in response to getblocks. Try to detect
3312 // this situation and push another getblocks to continue.
3313 pfrom->PushGetBlocks(mapBlockIndex[inv.hash], uint256(0));
3315 printf("force request: %s\n", inv.ToString().c_str());
3318 // Track requests for our stuff
3319 Inventory(inv.hash);
3324 else if (strCommand == "getdata")
3328 if (vInv.size() > MAX_INV_SZ)
3330 pfrom->Misbehaving(20);
3331 return error("message getdata size() = %"PRIszu"", vInv.size());
3334 if (fDebugNet || (vInv.size() != 1))
3335 printf("received getdata (%"PRIszu" invsz)\n", vInv.size());
3337 BOOST_FOREACH(const CInv& inv, vInv)
3341 if (fDebugNet || (vInv.size() == 1))
3342 printf("received getdata for: %s\n", inv.ToString().c_str());
3344 if (inv.type == MSG_BLOCK)
3346 // Send block from disk
3347 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(inv.hash);
3348 if (mi != mapBlockIndex.end())
3351 block.ReadFromDisk((*mi).second);
3352 pfrom->PushMessage("block", block);
3354 // Trigger them to send a getblocks request for the next batch of inventory
3355 if (inv.hash == pfrom->hashContinue)
3357 // ppcoin: send latest proof-of-work block to allow the
3358 // download node to accept as orphan (proof-of-stake
3359 // block might be rejected by stake connection check)
3361 vInv.push_back(CInv(MSG_BLOCK, GetLastBlockIndex(pindexBest, false)->GetBlockHash()));
3362 pfrom->PushMessage("inv", vInv);
3363 pfrom->hashContinue = 0;
3367 else if (inv.IsKnownType())
3369 // Send stream from relay memory
3370 bool pushed = false;
3373 map<CInv, CDataStream>::iterator mi = mapRelay.find(inv);
3374 if (mi != mapRelay.end()) {
3375 pfrom->PushMessage(inv.GetCommand(), (*mi).second);
3379 if (!pushed && inv.type == MSG_TX) {
3381 if (mempool.exists(inv.hash)) {
3382 CTransaction tx = mempool.lookup(inv.hash);
3383 CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
3386 pfrom->PushMessage("tx", ss);
3391 // Track requests for our stuff
3392 Inventory(inv.hash);
3397 else if (strCommand == "getblocks")
3399 CBlockLocator locator;
3401 vRecv >> locator >> hashStop;
3403 // Find the last block the caller has in the main chain
3404 CBlockIndex* pindex = locator.GetBlockIndex();
3406 // Send the rest of the chain
3408 pindex = pindex->pnext;
3410 printf("getblocks %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
3411 for (; pindex; pindex = pindex->pnext)
3413 if (pindex->GetBlockHash() == hashStop)
3415 printf(" getblocks stopping at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str());
3416 // ppcoin: tell downloading node about the latest block if it's
3417 // without risk being rejected due to stake connection check
3418 if (hashStop != hashBestChain && pindex->GetBlockTime() + nStakeMinAge > pindexBest->GetBlockTime())
3419 pfrom->PushInventory(CInv(MSG_BLOCK, hashBestChain));
3422 pfrom->PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash()));
3425 // When this block is requested, we'll send an inv that'll make them
3426 // getblocks the next batch of inventory.
3427 printf(" getblocks stopping at limit %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str());
3428 pfrom->hashContinue = pindex->GetBlockHash();
3433 else if (strCommand == "checkpoint")
3435 CSyncCheckpoint checkpoint;
3436 vRecv >> checkpoint;
3438 if (checkpoint.ProcessSyncCheckpoint(pfrom))
3441 pfrom->hashCheckpointKnown = checkpoint.hashCheckpoint;
3443 BOOST_FOREACH(CNode* pnode, vNodes)
3444 checkpoint.RelayTo(pnode);
3448 else if (strCommand == "getheaders")
3450 CBlockLocator locator;
3452 vRecv >> locator >> hashStop;
3454 CBlockIndex* pindex = NULL;
3455 if (locator.IsNull())
3457 // If locator is null, return the hashStop block
3458 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashStop);
3459 if (mi == mapBlockIndex.end())
3461 pindex = (*mi).second;
3465 // Find the last block the caller has in the main chain
3466 pindex = locator.GetBlockIndex();
3468 pindex = pindex->pnext;
3471 vector<CBlock> vHeaders;
3473 printf("getheaders %d to %s\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str());
3474 for (; pindex; pindex = pindex->pnext)
3476 vHeaders.push_back(pindex->GetBlockHeader());
3477 if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
3480 pfrom->PushMessage("headers", vHeaders);
3484 else if (strCommand == "tx")
3486 vector<uint256> vWorkQueue;
3487 vector<uint256> vEraseQueue;
3488 CDataStream vMsg(vRecv);
3493 CInv inv(MSG_TX, tx.GetHash());
3494 pfrom->AddInventoryKnown(inv);
3496 bool fMissingInputs = false;
3497 if (tx.AcceptToMemoryPool(txdb, true, &fMissingInputs))
3499 SyncWithWallets(tx, NULL, true);
3500 RelayTransaction(tx, inv.hash);
3501 mapAlreadyAskedFor.erase(inv);
3502 vWorkQueue.push_back(inv.hash);
3503 vEraseQueue.push_back(inv.hash);
3505 // Recursively process any orphan transactions that depended on this one
3506 for (unsigned int i = 0; i < vWorkQueue.size(); i++)
3508 uint256 hashPrev = vWorkQueue[i];
3509 for (set<uint256>::iterator mi = mapOrphanTransactionsByPrev[hashPrev].begin();
3510 mi != mapOrphanTransactionsByPrev[hashPrev].end();
3513 const uint256& orphanTxHash = *mi;
3514 CTransaction& orphanTx = mapOrphanTransactions[orphanTxHash];
3515 bool fMissingInputs2 = false;
3517 if (orphanTx.AcceptToMemoryPool(txdb, true, &fMissingInputs2))
3519 printf(" accepted orphan tx %s\n", orphanTxHash.ToString().substr(0,10).c_str());
3520 SyncWithWallets(tx, NULL, true);
3521 RelayTransaction(orphanTx, orphanTxHash);
3522 mapAlreadyAskedFor.erase(CInv(MSG_TX, orphanTxHash));
3523 vWorkQueue.push_back(orphanTxHash);
3524 vEraseQueue.push_back(orphanTxHash);
3526 else if (!fMissingInputs2)
3529 vEraseQueue.push_back(orphanTxHash);
3530 printf(" removed invalid orphan tx %s\n", orphanTxHash.ToString().substr(0,10).c_str());
3535 BOOST_FOREACH(uint256 hash, vEraseQueue)
3536 EraseOrphanTx(hash);
3538 else if (fMissingInputs)
3542 // DoS prevention: do not allow mapOrphanTransactions to grow unbounded
3543 unsigned int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
3545 printf("mapOrphan overflow, removed %u tx\n", nEvicted);
3547 if (tx.nDoS) pfrom->Misbehaving(tx.nDoS);
3551 else if (strCommand == "block")
3555 uint256 hashBlock = block.GetHash();
3557 printf("received block %s\n", hashBlock.ToString().substr(0,20).c_str());
3560 CInv inv(MSG_BLOCK, hashBlock);
3561 pfrom->AddInventoryKnown(inv);
3563 if (ProcessBlock(pfrom, &block))
3564 mapAlreadyAskedFor.erase(inv);
3565 if (block.nDoS) pfrom->Misbehaving(block.nDoS);
3569 else if (strCommand == "getaddr")
3571 // Don't return addresses older than nCutOff timestamp
3572 int64 nCutOff = GetTime() - (nNodeLifespan * 24 * 60 * 60);
3573 pfrom->vAddrToSend.clear();
3574 vector<CAddress> vAddr = addrman.GetAddr();
3575 BOOST_FOREACH(const CAddress &addr, vAddr)
3576 if(addr.nTime > nCutOff)
3577 pfrom->PushAddress(addr);
3581 else if (strCommand == "mempool")
3583 std::vector<uint256> vtxid;
3584 mempool.queryHashes(vtxid);
3586 for (unsigned int i = 0; i < vtxid.size(); i++) {
3587 CInv inv(MSG_TX, vtxid[i]);
3588 vInv.push_back(inv);
3589 if (i == (MAX_INV_SZ - 1))
3592 if (vInv.size() > 0)
3593 pfrom->PushMessage("inv", vInv);
3597 else if (strCommand == "checkorder")
3602 if (!GetBoolArg("-allowreceivebyip"))
3604 pfrom->PushMessage("reply", hashReply, (int)2, string(""));
3611 /// we have a chance to check the order here
3613 // Keep giving the same key to the same ip until they use it
3614 if (!mapReuseKey.count(pfrom->addr))
3615 pwalletMain->GetKeyFromPool(mapReuseKey[pfrom->addr], true);
3617 // Send back approval of order and pubkey to use
3618 CScript scriptPubKey;
3619 scriptPubKey << mapReuseKey[pfrom->addr] << OP_CHECKSIG;
3620 pfrom->PushMessage("reply", hashReply, (int)0, scriptPubKey);
3624 else if (strCommand == "reply")
3629 CRequestTracker tracker;
3631 LOCK(pfrom->cs_mapRequests);
3632 map<uint256, CRequestTracker>::iterator mi = pfrom->mapRequests.find(hashReply);
3633 if (mi != pfrom->mapRequests.end())
3635 tracker = (*mi).second;
3636 pfrom->mapRequests.erase(mi);
3639 if (!tracker.IsNull())
3640 tracker.fn(tracker.param1, vRecv);
3644 else if (strCommand == "ping")
3646 if (pfrom->nVersion > BIP0031_VERSION)
3650 // Echo the message back with the nonce. This allows for two useful features:
3652 // 1) A remote node can quickly check if the connection is operational
3653 // 2) Remote nodes can measure the latency of the network thread. If this node
3654 // is overloaded it won't respond to pings quickly and the remote node can
3655 // avoid sending us more work, like chain download requests.
3657 // The nonce stops the remote getting confused between different pings: without
3658 // it, if the remote node sends a ping once per second and this node takes 5
3659 // seconds to respond to each, the 5th ping the remote sends would appear to
3660 // return very quickly.
3661 pfrom->PushMessage("pong", nonce);
3666 else if (strCommand == "alert")
3671 uint256 alertHash = alert.GetHash();
3672 if (pfrom->setKnown.count(alertHash) == 0)
3674 if (alert.ProcessAlert())
3677 pfrom->setKnown.insert(alertHash);
3680 BOOST_FOREACH(CNode* pnode, vNodes)
3681 alert.RelayTo(pnode);
3685 // Small DoS penalty so peers that send us lots of
3686 // duplicate/expired/invalid-signature/whatever alerts
3687 // eventually get banned.
3688 // This isn't a Misbehaving(100) (immediate ban) because the
3689 // peer might be an older or different implementation with
3690 // a different signature key, etc.
3691 pfrom->Misbehaving(10);
3699 // Ignore unknown commands for extensibility
3703 // Update the last seen time for this node's address
3704 if (pfrom->fNetworkNode)
3705 if (strCommand == "version" || strCommand == "addr" || strCommand == "inv" || strCommand == "getdata" || strCommand == "ping")
3706 AddressCurrentlyConnected(pfrom->addr);
3712 bool ProcessMessages(CNode* pfrom)
3714 CDataStream& vRecv = pfrom->vRecv;
3718 // printf("ProcessMessages(%u bytes)\n", vRecv.size());
3722 // (4) message start
3731 // Don't bother if send buffer is too full to respond anyway
3732 if (pfrom->vSend.size() >= SendBufferSize())
3735 // Scan for message start
3736 CDataStream::iterator pstart = search(vRecv.begin(), vRecv.end(), BEGIN(pchMessageStart), END(pchMessageStart));
3737 int nHeaderSize = vRecv.GetSerializeSize(CMessageHeader());
3738 if (vRecv.end() - pstart < nHeaderSize)
3740 if ((int)vRecv.size() > nHeaderSize)
3742 printf("\n\nPROCESSMESSAGE MESSAGESTART NOT FOUND\n\n");
3743 vRecv.erase(vRecv.begin(), vRecv.end() - nHeaderSize);
3747 if (pstart - vRecv.begin() > 0)
3748 printf("\n\nPROCESSMESSAGE SKIPPED %"PRIpdd" BYTES\n\n", pstart - vRecv.begin());
3749 vRecv.erase(vRecv.begin(), pstart);
3752 vector<char> vHeaderSave(vRecv.begin(), vRecv.begin() + nHeaderSize);
3757 printf("\n\nPROCESSMESSAGE: ERRORS IN HEADER %s\n\n\n", hdr.GetCommand().c_str());
3760 string strCommand = hdr.GetCommand();
3763 unsigned int nMessageSize = hdr.nMessageSize;
3764 if (nMessageSize > MAX_SIZE)
3766 printf("ProcessMessages(%s, %u bytes) : nMessageSize > MAX_SIZE\n", strCommand.c_str(), nMessageSize);
3769 if (nMessageSize > vRecv.size())
3771 // Rewind and wait for rest of message
3772 vRecv.insert(vRecv.begin(), vHeaderSave.begin(), vHeaderSave.end());
3777 uint256 hash = Hash(vRecv.begin(), vRecv.begin() + nMessageSize);
3778 unsigned int nChecksum = 0;
3779 memcpy(&nChecksum, &hash, sizeof(nChecksum));
3780 if (nChecksum != hdr.nChecksum)
3782 printf("ProcessMessages(%s, %u bytes) : CHECKSUM ERROR nChecksum=%08x hdr.nChecksum=%08x\n",
3783 strCommand.c_str(), nMessageSize, nChecksum, hdr.nChecksum);
3787 // Copy message to its own buffer
3788 CDataStream vMsg(vRecv.begin(), vRecv.begin() + nMessageSize, vRecv.nType, vRecv.nVersion);
3789 vRecv.ignore(nMessageSize);
3797 fRet = ProcessMessage(pfrom, strCommand, vMsg);
3802 catch (std::ios_base::failure& e)
3804 if (strstr(e.what(), "end of data"))
3806 // Allow exceptions from under-length message on vRecv
3807 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());
3809 else if (strstr(e.what(), "size too large"))
3811 // Allow exceptions from over-long size
3812 printf("ProcessMessages(%s, %u bytes) : Exception '%s' caught\n", strCommand.c_str(), nMessageSize, e.what());
3816 PrintExceptionContinue(&e, "ProcessMessages()");
3819 catch (std::exception& e) {
3820 PrintExceptionContinue(&e, "ProcessMessages()");
3822 PrintExceptionContinue(NULL, "ProcessMessages()");
3826 printf("ProcessMessage(%s, %u bytes) FAILED\n", strCommand.c_str(), nMessageSize);
3834 bool SendMessages(CNode* pto, bool fSendTrickle)
3836 TRY_LOCK(cs_main, lockMain);
3838 // Don't send anything until we get their version message
3839 if (pto->nVersion == 0)
3842 // Keep-alive ping. We send a nonce of zero because we don't use it anywhere
3844 if (pto->nLastSend && GetTime() - pto->nLastSend > 30 * 60 && pto->vSend.empty()) {
3846 if (pto->nVersion > BIP0031_VERSION)
3847 pto->PushMessage("ping", nonce);
3849 pto->PushMessage("ping");
3852 // Resend wallet transactions that haven't gotten in a block yet
3853 ResendWalletTransactions();
3855 // Address refresh broadcast
3856 static int64 nLastRebroadcast;
3857 if (!IsInitialBlockDownload() && (GetTime() - nLastRebroadcast > 24 * 60 * 60))
3861 BOOST_FOREACH(CNode* pnode, vNodes)
3863 // Periodically clear setAddrKnown to allow refresh broadcasts
3864 if (nLastRebroadcast)
3865 pnode->setAddrKnown.clear();
3867 // Rebroadcast our address
3870 CAddress addr = GetLocalAddress(&pnode->addr);
3871 if (addr.IsRoutable())
3872 pnode->PushAddress(addr);
3876 nLastRebroadcast = GetTime();
3884 vector<CAddress> vAddr;
3885 vAddr.reserve(pto->vAddrToSend.size());
3886 BOOST_FOREACH(const CAddress& addr, pto->vAddrToSend)
3888 // returns true if wasn't already contained in the set
3889 if (pto->setAddrKnown.insert(addr).second)
3891 vAddr.push_back(addr);
3892 // receiver rejects addr messages larger than 1000
3893 if (vAddr.size() >= 1000)
3895 pto->PushMessage("addr", vAddr);
3900 pto->vAddrToSend.clear();
3902 pto->PushMessage("addr", vAddr);
3907 // Message: inventory
3910 vector<CInv> vInvWait;
3912 LOCK(pto->cs_inventory);
3913 vInv.reserve(pto->vInventoryToSend.size());
3914 vInvWait.reserve(pto->vInventoryToSend.size());
3915 BOOST_FOREACH(const CInv& inv, pto->vInventoryToSend)
3917 if (pto->setInventoryKnown.count(inv))
3920 // trickle out tx inv to protect privacy
3921 if (inv.type == MSG_TX && !fSendTrickle)
3923 // 1/4 of tx invs blast to all immediately
3924 static uint256 hashSalt;
3926 hashSalt = GetRandHash();
3927 uint256 hashRand = inv.hash ^ hashSalt;
3928 hashRand = Hash(BEGIN(hashRand), END(hashRand));
3929 bool fTrickleWait = ((hashRand & 3) != 0);
3931 // always trickle our own transactions
3935 if (GetTransaction(inv.hash, wtx))
3937 fTrickleWait = true;
3942 vInvWait.push_back(inv);
3947 // returns true if wasn't already contained in the set
3948 if (pto->setInventoryKnown.insert(inv).second)
3950 vInv.push_back(inv);
3951 if (vInv.size() >= 1000)
3953 pto->PushMessage("inv", vInv);
3958 pto->vInventoryToSend = vInvWait;
3961 pto->PushMessage("inv", vInv);
3967 vector<CInv> vGetData;
3968 int64 nNow = GetTime() * 1000000;
3970 while (!pto->mapAskFor.empty() && (*pto->mapAskFor.begin()).first <= nNow)
3972 const CInv& inv = (*pto->mapAskFor.begin()).second;
3973 if (!AlreadyHave(txdb, inv))
3976 printf("sending getdata: %s\n", inv.ToString().c_str());
3977 vGetData.push_back(inv);
3978 if (vGetData.size() >= 1000)
3980 pto->PushMessage("getdata", vGetData);
3983 mapAlreadyAskedFor[inv] = nNow;
3985 pto->mapAskFor.erase(pto->mapAskFor.begin());
3987 if (!vGetData.empty())
3988 pto->PushMessage("getdata", vGetData);