bitcoin-asciilifeform.1

raw
genesis                 1 // Copyright (c) 2009-2010 Satoshi Nakamoto
genesis                 2 // Copyright (c) 2009-2012 The Bitcoin developers
genesis                 3 // Distributed under the MIT/X11 software license, see the accompanying
genesis                 4 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
genesis                 5 #include "headers.h"
genesis                 6 #include "checkpoints.h"
genesis                 7 #include "db.h"
genesis                 8 #include "net.h"
genesis                 9 #include "init.h"
genesis                10 #include <boost/filesystem.hpp>
genesis                11 #include <boost/filesystem/fstream.hpp>
genesis                12 
genesis                13 using namespace std;
genesis                14 using namespace boost;
genesis                15 
genesis                16 //
genesis                17 // Global state
genesis                18 //
genesis                19 
genesis                20 CCriticalSection cs_setpwalletRegistered;
genesis                21 set<CWallet*> setpwalletRegistered;
genesis                22 
genesis                23 CCriticalSection cs_main;
genesis                24 
genesis                25 static map<uint256, CTransaction> mapTransactions;
genesis                26 CCriticalSection cs_mapTransactions;
genesis                27 unsigned int nTransactionsUpdated = 0;
genesis                28 map<COutPoint, CInPoint> mapNextTx;
genesis                29 
genesis                30 map<uint256, CBlockIndex*> mapBlockIndex;
genesis                31 uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f");
genesis                32 static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
genesis                33 CBlockIndex* pindexGenesisBlock = NULL;
genesis                34 int nBestHeight = -1;
genesis                35 CBigNum bnBestChainWork = 0;
genesis                36 CBigNum bnBestInvalidWork = 0;
genesis                37 uint256 hashBestChain = 0;
genesis                38 CBlockIndex* pindexBest = NULL;
genesis                39 int64 nTimeBestReceived = 0;
genesis                40 
genesis                41 CMedianFilter<int> cPeerBlockCounts(5, 0); // Amount of blocks that other nodes claim to have
genesis                42 
genesis                43 map<uint256, CBlock*> mapOrphanBlocks;
genesis                44 multimap<uint256, CBlock*> mapOrphanBlocksByPrev;
genesis                45 
genesis                46 map<uint256, CDataStream*> mapOrphanTransactions;
genesis                47 multimap<uint256, CDataStream*> mapOrphanTransactionsByPrev;
genesis                48 
genesis                49 
genesis                50 double dHashesPerSec;
genesis                51 int64 nHPSTimerStart;
genesis                52 
genesis                53 // Settings
genesis                54 int fGenerateBitcoins = false;
genesis                55 int64 nTransactionFee = 0;
genesis                56 int fLimitProcessors = false;
genesis                57 int nLimitProcessors = 1;
genesis                58 int fMinimizeToTray = true;
genesis                59 int fMinimizeOnClose = true;
genesis                60 #if USE_UPNP
genesis                61 int fUseUPnP = true;
genesis                62 #else
genesis                63 int fUseUPnP = false;
genesis                64 #endif
genesis                65 
genesis                66 
genesis                67 //////////////////////////////////////////////////////////////////////////////
genesis                68 //
genesis                69 // dispatching functions
genesis                70 //
genesis                71 
genesis                72 // These functions dispatch to one or all registered wallets
genesis                73 
genesis                74 
genesis                75 void RegisterWallet(CWallet* pwalletIn)
genesis                76 {
genesis                77     CRITICAL_BLOCK(cs_setpwalletRegistered)
genesis                78     {
genesis                79         setpwalletRegistered.insert(pwalletIn);
genesis                80     }
genesis                81 }
genesis                82 
genesis                83 void UnregisterWallet(CWallet* pwalletIn)
genesis                84 {
genesis                85     CRITICAL_BLOCK(cs_setpwalletRegistered)
genesis                86     {
genesis                87         setpwalletRegistered.erase(pwalletIn);
genesis                88     }
genesis                89 }
genesis                90 
genesis                91 // check whether the passed transaction is from us
genesis                92 bool static IsFromMe(CTransaction& tx)
genesis                93 {
genesis                94     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
genesis                95         if (pwallet->IsFromMe(tx))
genesis                96             return true;
genesis                97     return false;
genesis                98 }
genesis                99 
genesis               100 // get the wallet transaction with the given hash (if it exists)
genesis               101 bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
genesis               102 {
genesis               103     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
genesis               104         if (pwallet->GetTransaction(hashTx,wtx))
genesis               105             return true;
genesis               106     return false;
genesis               107 }
genesis               108 
genesis               109 // erases transaction with the given hash from all wallets
genesis               110 void static EraseFromWallets(uint256 hash)
genesis               111 {
genesis               112     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
genesis               113         pwallet->EraseFromWallet(hash);
genesis               114 }
genesis               115 
genesis               116 // make sure all wallets know about the given transaction, in the given block
genesis               117 void static SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL, bool fUpdate = false)
genesis               118 {
genesis               119     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
genesis               120         pwallet->AddToWalletIfInvolvingMe(tx, pblock, fUpdate);
genesis               121 }
genesis               122 
genesis               123 // notify wallets about a new best chain
genesis               124 void static SetBestChain(const CBlockLocator& loc)
genesis               125 {
genesis               126     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
genesis               127         pwallet->SetBestChain(loc);
genesis               128 }
genesis               129 
genesis               130 // notify wallets about an updated transaction
genesis               131 void static UpdatedTransaction(const uint256& hashTx)
genesis               132 {
genesis               133     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
genesis               134         pwallet->UpdatedTransaction(hashTx);
genesis               135 }
genesis               136 
genesis               137 // dump all wallets
genesis               138 void static PrintWallets(const CBlock& block)
genesis               139 {
genesis               140     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
genesis               141         pwallet->PrintWallet(block);
genesis               142 }
genesis               143 
genesis               144 // notify wallets about an incoming inventory (for request counts)
genesis               145 void static Inventory(const uint256& hash)
genesis               146 {
genesis               147     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
genesis               148         pwallet->Inventory(hash);
genesis               149 }
genesis               150 
genesis               151 // ask wallets to resend their transactions
genesis               152 void static ResendWalletTransactions()
genesis               153 {
genesis               154     BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
genesis               155         pwallet->ResendWalletTransactions();
genesis               156 }
genesis               157 
genesis               158 
genesis               159 
genesis               160 
genesis               161 
genesis               162 
genesis               163 
genesis               164 //////////////////////////////////////////////////////////////////////////////
genesis               165 //
genesis               166 // mapOrphanTransactions
genesis               167 //
genesis               168 
genesis               169 void AddOrphanTx(const CDataStream& vMsg)
genesis               170 {
genesis               171     CTransaction tx;
genesis               172     CDataStream(vMsg) >> tx;
genesis               173     uint256 hash = tx.GetHash();
genesis               174     if (mapOrphanTransactions.count(hash))
genesis               175         return;
genesis               176 
genesis               177     CDataStream* pvMsg = mapOrphanTransactions[hash] = new CDataStream(vMsg);
genesis               178     BOOST_FOREACH(const CTxIn& txin, tx.vin)
genesis               179         mapOrphanTransactionsByPrev.insert(make_pair(txin.prevout.hash, pvMsg));
genesis               180 }
genesis               181 
genesis               182 void static EraseOrphanTx(uint256 hash)
genesis               183 {
genesis               184     if (!mapOrphanTransactions.count(hash))
genesis               185         return;
genesis               186     const CDataStream* pvMsg = mapOrphanTransactions[hash];
genesis               187     CTransaction tx;
genesis               188     CDataStream(*pvMsg) >> tx;
genesis               189     BOOST_FOREACH(const CTxIn& txin, tx.vin)
genesis               190     {
genesis               191         for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(txin.prevout.hash);
genesis               192              mi != mapOrphanTransactionsByPrev.upper_bound(txin.prevout.hash);)
genesis               193         {
genesis               194             if ((*mi).second == pvMsg)
genesis               195                 mapOrphanTransactionsByPrev.erase(mi++);
genesis               196             else
genesis               197                 mi++;
genesis               198         }
genesis               199     }
genesis               200     delete pvMsg;
genesis               201     mapOrphanTransactions.erase(hash);
genesis               202 }
genesis               203 
genesis               204 int LimitOrphanTxSize(int nMaxOrphans)
genesis               205 {
genesis               206     int nEvicted = 0;
genesis               207     while (mapOrphanTransactions.size() > nMaxOrphans)
genesis               208     {
genesis               209         // Evict a random orphan:
genesis               210         std::vector<unsigned char> randbytes(32);
genesis               211         RAND_bytes(&randbytes[0], 32);
genesis               212         uint256 randomhash(randbytes);
genesis               213         map<uint256, CDataStream*>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
genesis               214         if (it == mapOrphanTransactions.end())
genesis               215             it = mapOrphanTransactions.begin();
genesis               216         EraseOrphanTx(it->first);
genesis               217         ++nEvicted;
genesis               218     }
genesis               219     return nEvicted;
genesis               220 }
genesis               221 
genesis               222 
genesis               223 
genesis               224 
genesis               225 
genesis               226 
genesis               227 
genesis               228 //////////////////////////////////////////////////////////////////////////////
genesis               229 //
genesis               230 // CTransaction and CTxIndex
genesis               231 //
genesis               232 
genesis               233 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet)
genesis               234 {
genesis               235     SetNull();
genesis               236     if (!txdb.ReadTxIndex(prevout.hash, txindexRet))
genesis               237         return false;
genesis               238     if (!ReadFromDisk(txindexRet.pos))
genesis               239         return false;
genesis               240     if (prevout.n >= vout.size())
genesis               241     {
genesis               242         SetNull();
genesis               243         return false;
genesis               244     }
genesis               245     return true;
genesis               246 }
genesis               247 
genesis               248 bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout)
genesis               249 {
genesis               250     CTxIndex txindex;
genesis               251     return ReadFromDisk(txdb, prevout, txindex);
genesis               252 }
genesis               253 
genesis               254 bool CTransaction::ReadFromDisk(COutPoint prevout)
genesis               255 {
genesis               256     CTxDB txdb("r");
genesis               257     CTxIndex txindex;
genesis               258     return ReadFromDisk(txdb, prevout, txindex);
genesis               259 }
genesis               260 
genesis               261 
genesis               262 
genesis               263 int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
genesis               264 {
genesis               265     if (fClient)
genesis               266     {
genesis               267         if (hashBlock == 0)
genesis               268             return 0;
genesis               269     }
genesis               270     else
genesis               271     {
genesis               272         CBlock blockTmp;
genesis               273         if (pblock == NULL)
genesis               274         {
genesis               275             // Load the block this tx is in
genesis               276             CTxIndex txindex;
genesis               277             if (!CTxDB("r").ReadTxIndex(GetHash(), txindex))
genesis               278                 return 0;
genesis               279             if (!blockTmp.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos))
genesis               280                 return 0;
genesis               281             pblock = &blockTmp;
genesis               282         }
genesis               283 
genesis               284         // Update the tx's hashBlock
genesis               285         hashBlock = pblock->GetHash();
genesis               286 
genesis               287         // Locate the transaction
genesis               288         for (nIndex = 0; nIndex < pblock->vtx.size(); nIndex++)
genesis               289             if (pblock->vtx[nIndex] == *(CTransaction*)this)
genesis               290                 break;
genesis               291         if (nIndex == pblock->vtx.size())
genesis               292         {
genesis               293             vMerkleBranch.clear();
genesis               294             nIndex = -1;
genesis               295             printf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
genesis               296             return 0;
genesis               297         }
genesis               298 
genesis               299         // Fill in merkle branch
genesis               300         vMerkleBranch = pblock->GetMerkleBranch(nIndex);
genesis               301     }
genesis               302 
genesis               303     // Is the tx in a block that's in the main chain
genesis               304     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
genesis               305     if (mi == mapBlockIndex.end())
genesis               306         return 0;
genesis               307     CBlockIndex* pindex = (*mi).second;
genesis               308     if (!pindex || !pindex->IsInMainChain())
genesis               309         return 0;
genesis               310 
genesis               311     return pindexBest->nHeight - pindex->nHeight + 1;
genesis               312 }
genesis               313 
genesis               314 
genesis               315 
genesis               316 
genesis               317 
genesis               318 
genesis               319 
genesis               320 bool CTransaction::CheckTransaction() const
genesis               321 {
genesis               322     // Basic checks that don't depend on any context
genesis               323     if (vin.empty())
genesis               324         return DoS(10, error("CTransaction::CheckTransaction() : vin empty"));
genesis               325     if (vout.empty())
genesis               326         return DoS(10, error("CTransaction::CheckTransaction() : vout empty"));
genesis               327     // Size limits
genesis               328     if (::GetSerializeSize(*this, SER_NETWORK) > MAX_BLOCK_SIZE)
genesis               329         return DoS(100, error("CTransaction::CheckTransaction() : size limits failed"));
genesis               330 
genesis               331     // Check for negative or overflow output values
genesis               332     int64 nValueOut = 0;
genesis               333     BOOST_FOREACH(const CTxOut& txout, vout)
genesis               334     {
genesis               335         if (txout.nValue < 0)
genesis               336             return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue negative"));
genesis               337         if (txout.nValue > MAX_MONEY)
genesis               338             return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue too high"));
genesis               339         nValueOut += txout.nValue;
genesis               340         if (!MoneyRange(nValueOut))
genesis               341             return DoS(100, error("CTransaction::CheckTransaction() : txout total out of range"));
genesis               342     }
genesis               343 
genesis               344     // Check for duplicate inputs
genesis               345     set<COutPoint> vInOutPoints;
genesis               346     BOOST_FOREACH(const CTxIn& txin, vin)
genesis               347     {
genesis               348         if (vInOutPoints.count(txin.prevout))
genesis               349             return false;
genesis               350         vInOutPoints.insert(txin.prevout);
genesis               351     }
genesis               352 
genesis               353     if (IsCoinBase())
genesis               354     {
genesis               355         if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
genesis               356             return DoS(100, error("CTransaction::CheckTransaction() : coinbase script size"));
genesis               357     }
genesis               358     else
genesis               359     {
genesis               360         BOOST_FOREACH(const CTxIn& txin, vin)
genesis               361             if (txin.prevout.IsNull())
genesis               362                 return DoS(10, error("CTransaction::CheckTransaction() : prevout is null"));
genesis               363     }
genesis               364 
genesis               365     return true;
genesis               366 }
genesis               367 
genesis               368 bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMissingInputs)
genesis               369 {
genesis               370     if (pfMissingInputs)
genesis               371         *pfMissingInputs = false;
genesis               372 
genesis               373     if (!CheckTransaction())
genesis               374         return error("AcceptToMemoryPool() : CheckTransaction failed");
genesis               375 
genesis               376     // Coinbase is only valid in a block, not as a loose transaction
genesis               377     if (IsCoinBase())
genesis               378         return DoS(100, error("AcceptToMemoryPool() : coinbase as individual tx"));
genesis               379 
genesis               380     // To help v0.1.5 clients who would see it as a negative number
genesis               381     if ((int64)nLockTime > INT_MAX)
genesis               382         return error("AcceptToMemoryPool() : not accepting nLockTime beyond 2038 yet");
genesis               383 
genesis               384     // Safety limits
genesis               385     unsigned int nSize = ::GetSerializeSize(*this, SER_NETWORK);
genesis               386     // Checking ECDSA signatures is a CPU bottleneck, so to avoid denial-of-service
genesis               387     // attacks disallow transactions with more than one SigOp per 34 bytes.
genesis               388     // 34 bytes because a TxOut is:
genesis               389     //   20-byte address + 8 byte bitcoin amount + 5 bytes of ops + 1 byte script length
genesis               390     if (GetSigOpCount() > nSize / 34 || nSize < 100)
genesis               391         return error("AcceptToMemoryPool() : transaction with out-of-bounds SigOpCount");
genesis               392 
genesis               393     // Rather not work on nonstandard transactions (unless -testnet)
genesis               394     if (!fTestNet && !IsStandard())
genesis               395         return error("AcceptToMemoryPool() : nonstandard transaction type");
genesis               396 
genesis               397     // Do we already have it?
genesis               398     uint256 hash = GetHash();
genesis               399     CRITICAL_BLOCK(cs_mapTransactions)
genesis               400         if (mapTransactions.count(hash))
genesis               401             return false;
genesis               402     if (fCheckInputs)
genesis               403         if (txdb.ContainsTx(hash))
genesis               404             return false;
genesis               405 
genesis               406     // Check for conflicts with in-memory transactions
genesis               407     CTransaction* ptxOld = NULL;
genesis               408     for (int i = 0; i < vin.size(); i++)
genesis               409     {
genesis               410         COutPoint outpoint = vin[i].prevout;
genesis               411         if (mapNextTx.count(outpoint))
genesis               412         {
genesis               413             // Disable replacement feature for now
genesis               414             return false;
genesis               415 
genesis               416             // Allow replacing with a newer version of the same transaction
genesis               417             if (i != 0)
genesis               418                 return false;
genesis               419             ptxOld = mapNextTx[outpoint].ptx;
genesis               420             if (ptxOld->IsFinal())
genesis               421                 return false;
genesis               422             if (!IsNewerThan(*ptxOld))
genesis               423                 return false;
genesis               424             for (int i = 0; i < vin.size(); i++)
genesis               425             {
genesis               426                 COutPoint outpoint = vin[i].prevout;
genesis               427                 if (!mapNextTx.count(outpoint) || mapNextTx[outpoint].ptx != ptxOld)
genesis               428                     return false;
genesis               429             }
genesis               430             break;
genesis               431         }
genesis               432     }
genesis               433 
genesis               434     if (fCheckInputs)
genesis               435     {
genesis               436         // Check against previous transactions
genesis               437         map<uint256, CTxIndex> mapUnused;
genesis               438         int64 nFees = 0;
genesis               439         bool fInvalid = false;
genesis               440         if (!ConnectInputs(txdb, mapUnused, CDiskTxPos(1,1,1), pindexBest, nFees, false, false, 0, fInvalid))
genesis               441         {
genesis               442             if (fInvalid)
genesis               443                 return error("AcceptToMemoryPool() : FetchInputs found invalid tx %s", hash.ToString().substr(0,10).c_str());
genesis               444             return error("AcceptToMemoryPool() : ConnectInputs failed %s", hash.ToString().substr(0,10).c_str());
genesis               445         }
genesis               446 
genesis               447         // Don't accept it if it can't get into a block
genesis               448         if (nFees < GetMinFee(1000, true, true))
genesis               449             return error("AcceptToMemoryPool() : not enough fees");
genesis               450 
genesis               451         // Continuously rate-limit free transactions
genesis               452         // This mitigates 'penny-flooding' -- sending thousands of free transactions just to
genesis               453         // be annoying or make other's transactions take longer to confirm.
genesis               454         if (nFees < MIN_RELAY_TX_FEE)
genesis               455         {
genesis               456             static CCriticalSection cs;
genesis               457             static double dFreeCount;
genesis               458             static int64 nLastTime;
genesis               459             int64 nNow = GetTime();
genesis               460 
genesis               461             CRITICAL_BLOCK(cs)
genesis               462             {
genesis               463                 // Use an exponentially decaying ~10-minute window:
genesis               464                 dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
genesis               465                 nLastTime = nNow;
genesis               466                 // -limitfreerelay unit is thousand-bytes-per-minute
genesis               467                 // At default rate it would take over a month to fill 1GB
genesis               468                 if (dFreeCount > GetArg("-limitfreerelay", 15)*10*1000 && !IsFromMe(*this))
genesis               469                     return error("AcceptToMemoryPool() : free transaction rejected by rate limiter");
genesis               470                 if (fDebug)
genesis               471                     printf("Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
genesis               472                 dFreeCount += nSize;
genesis               473             }
genesis               474         }
genesis               475     }
genesis               476 
genesis               477     // Store transaction in memory
genesis               478     CRITICAL_BLOCK(cs_mapTransactions)
genesis               479     {
genesis               480         if (ptxOld)
genesis               481         {
genesis               482             printf("AcceptToMemoryPool() : replacing tx %s with new version\n", ptxOld->GetHash().ToString().c_str());
genesis               483             ptxOld->RemoveFromMemoryPool();
genesis               484         }
genesis               485         AddToMemoryPoolUnchecked();
genesis               486     }
genesis               487 
genesis               488     ///// are we sure this is ok when loading transactions or restoring block txes
genesis               489     // If updated, erase old tx from wallet
genesis               490     if (ptxOld)
genesis               491         EraseFromWallets(ptxOld->GetHash());
genesis               492 
genesis               493     printf("AcceptToMemoryPool(): accepted %s\n", hash.ToString().substr(0,10).c_str());
genesis               494     return true;
genesis               495 }
genesis               496 
genesis               497 bool CTransaction::AcceptToMemoryPool(bool fCheckInputs, bool* pfMissingInputs)
genesis               498 {
genesis               499     CTxDB txdb("r");
genesis               500     return AcceptToMemoryPool(txdb, fCheckInputs, pfMissingInputs);
genesis               501 }
genesis               502 
genesis               503 bool CTransaction::AddToMemoryPoolUnchecked()
genesis               504 {
genesis               505     // Add to memory pool without checking anything.  Don't call this directly,
genesis               506     // call AcceptToMemoryPool to properly check the transaction first.
genesis               507     CRITICAL_BLOCK(cs_mapTransactions)
genesis               508     {
genesis               509         uint256 hash = GetHash();
genesis               510         mapTransactions[hash] = *this;
genesis               511         for (int i = 0; i < vin.size(); i++)
genesis               512             mapNextTx[vin[i].prevout] = CInPoint(&mapTransactions[hash], i);
genesis               513         nTransactionsUpdated++;
genesis               514     }
genesis               515     return true;
genesis               516 }
genesis               517 
genesis               518 
genesis               519 bool CTransaction::RemoveFromMemoryPool()
genesis               520 {
genesis               521     // Remove transaction from memory pool
genesis               522     CRITICAL_BLOCK(cs_mapTransactions)
genesis               523     {
genesis               524         BOOST_FOREACH(const CTxIn& txin, vin)
genesis               525             mapNextTx.erase(txin.prevout);
genesis               526         mapTransactions.erase(GetHash());
genesis               527         nTransactionsUpdated++;
genesis               528     }
genesis               529     return true;
genesis               530 }
genesis               531 
genesis               532 
genesis               533 
genesis               534 
genesis               535 
genesis               536 
genesis               537 int CMerkleTx::GetDepthInMainChain(int& nHeightRet) const
genesis               538 {
genesis               539     if (hashBlock == 0 || nIndex == -1)
genesis               540         return 0;
genesis               541 
genesis               542     // Find the block it claims to be in
genesis               543     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
genesis               544     if (mi == mapBlockIndex.end())
genesis               545         return 0;
genesis               546     CBlockIndex* pindex = (*mi).second;
genesis               547     if (!pindex || !pindex->IsInMainChain())
genesis               548         return 0;
genesis               549 
genesis               550     // Make sure the merkle branch connects to this block
genesis               551     if (!fMerkleVerified)
genesis               552     {
genesis               553         if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != pindex->hashMerkleRoot)
genesis               554             return 0;
genesis               555         fMerkleVerified = true;
genesis               556     }
genesis               557 
genesis               558     nHeightRet = pindex->nHeight;
genesis               559     return pindexBest->nHeight - pindex->nHeight + 1;
genesis               560 }
genesis               561 
genesis               562 
genesis               563 int CMerkleTx::GetBlocksToMaturity() const
genesis               564 {
genesis               565     if (!IsCoinBase())
genesis               566         return 0;
genesis               567     return max(0, (COINBASE_MATURITY+20) - GetDepthInMainChain());
genesis               568 }
genesis               569 
genesis               570 
genesis               571 bool CMerkleTx::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs)
genesis               572 {
genesis               573     if (fClient)
genesis               574     {
genesis               575         if (!IsInMainChain() && !ClientConnectInputs())
genesis               576             return false;
genesis               577         return CTransaction::AcceptToMemoryPool(txdb, false);
genesis               578     }
genesis               579     else
genesis               580     {
genesis               581         return CTransaction::AcceptToMemoryPool(txdb, fCheckInputs);
genesis               582     }
genesis               583 }
genesis               584 
genesis               585 bool CMerkleTx::AcceptToMemoryPool()
genesis               586 {
genesis               587     CTxDB txdb("r");
genesis               588     return AcceptToMemoryPool(txdb);
genesis               589 }
genesis               590 
genesis               591 
genesis               592 
genesis               593 bool CWalletTx::AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs)
genesis               594 {
genesis               595     CRITICAL_BLOCK(cs_mapTransactions)
genesis               596     {
genesis               597         // Add previous supporting transactions first
genesis               598         BOOST_FOREACH(CMerkleTx& tx, vtxPrev)
genesis               599         {
genesis               600             if (!tx.IsCoinBase())
genesis               601             {
genesis               602                 uint256 hash = tx.GetHash();
genesis               603                 if (!mapTransactions.count(hash) && !txdb.ContainsTx(hash))
genesis               604                     tx.AcceptToMemoryPool(txdb, fCheckInputs);
genesis               605             }
genesis               606         }
genesis               607         return AcceptToMemoryPool(txdb, fCheckInputs);
genesis               608     }
genesis               609     return false;
genesis               610 }
genesis               611 
genesis               612 bool CWalletTx::AcceptWalletTransaction() 
genesis               613 {
genesis               614     CTxDB txdb("r");
genesis               615     return AcceptWalletTransaction(txdb);
genesis               616 }
genesis               617 
genesis               618 int CTxIndex::GetDepthInMainChain() const
genesis               619 {
genesis               620     // Read block header
genesis               621     CBlock block;
genesis               622     if (!block.ReadFromDisk(pos.nFile, pos.nBlockPos, false))
genesis               623         return 0;
genesis               624     // Find the block in the index
genesis               625     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(block.GetHash());
genesis               626     if (mi == mapBlockIndex.end())
genesis               627         return 0;
genesis               628     CBlockIndex* pindex = (*mi).second;
genesis               629     if (!pindex || !pindex->IsInMainChain())
genesis               630         return 0;
genesis               631     return 1 + nBestHeight - pindex->nHeight;
genesis               632 }
genesis               633 
genesis               634 
genesis               635 
genesis               636 
genesis               637 
genesis               638 
genesis               639 
genesis               640 
genesis               641 
genesis               642 
genesis               643 //////////////////////////////////////////////////////////////////////////////
genesis               644 //
genesis               645 // CBlock and CBlockIndex
genesis               646 //
genesis               647 
genesis               648 bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
genesis               649 {
genesis               650     if (!fReadTransactions)
genesis               651     {
genesis               652         *this = pindex->GetBlockHeader();
genesis               653         return true;
genesis               654     }
genesis               655     if (!ReadFromDisk(pindex->nFile, pindex->nBlockPos, fReadTransactions))
genesis               656         return false;
genesis               657     if (GetHash() != pindex->GetBlockHash())
genesis               658         return error("CBlock::ReadFromDisk() : GetHash() doesn't match index");
genesis               659     return true;
genesis               660 }
genesis               661 
genesis               662 uint256 static GetOrphanRoot(const CBlock* pblock)
genesis               663 {
genesis               664     // Work back to the first block in the orphan chain
genesis               665     while (mapOrphanBlocks.count(pblock->hashPrevBlock))
genesis               666         pblock = mapOrphanBlocks[pblock->hashPrevBlock];
genesis               667     return pblock->GetHash();
genesis               668 }
genesis               669 
genesis               670 int64 static GetBlockValue(int nHeight, int64 nFees)
genesis               671 {
genesis               672     int64 nSubsidy = 50 * COIN;
genesis               673 
genesis               674     // Subsidy is cut in half every 4 years
genesis               675     nSubsidy >>= (nHeight / 210000);
genesis               676 
genesis               677     return nSubsidy + nFees;
genesis               678 }
genesis               679 
genesis               680 static const int64 nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
genesis               681 static const int64 nTargetSpacing = 10 * 60;
genesis               682 static const int64 nInterval = nTargetTimespan / nTargetSpacing;
genesis               683 
genesis               684 //
genesis               685 // minimum amount of work that could possibly be required nTime after
genesis               686 // minimum work required was nBase
genesis               687 //
genesis               688 unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
genesis               689 {
genesis               690     // Testnet has min-difficulty blocks
genesis               691     // after nTargetSpacing*2 time between blocks:
genesis               692     if (fTestNet && nTime > nTargetSpacing*2)
genesis               693         return bnProofOfWorkLimit.GetCompact();
genesis               694 
genesis               695     CBigNum bnResult;
genesis               696     bnResult.SetCompact(nBase);
genesis               697     while (nTime > 0 && bnResult < bnProofOfWorkLimit)
genesis               698     {
genesis               699         // Maximum 400% adjustment...
genesis               700         bnResult *= 4;
genesis               701         // ... in best-case exactly 4-times-normal target time
genesis               702         nTime -= nTargetTimespan*4;
genesis               703     }
genesis               704     if (bnResult > bnProofOfWorkLimit)
genesis               705         bnResult = bnProofOfWorkLimit;
genesis               706     return bnResult.GetCompact();
genesis               707 }
genesis               708 
genesis               709 unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlock *pblock)
genesis               710 {
genesis               711     unsigned int nProofOfWorkLimit = bnProofOfWorkLimit.GetCompact();
genesis               712 
genesis               713     // Genesis block
genesis               714     if (pindexLast == NULL)
genesis               715         return nProofOfWorkLimit;
genesis               716 
genesis               717     // Only change once per interval
genesis               718     if ((pindexLast->nHeight+1) % nInterval != 0)
genesis               719     {
genesis               720         // Special rules for testnet after 15 Feb 2012:
genesis               721         if (fTestNet && pblock->nTime > 1329264000)
genesis               722         {
genesis               723             // If the new block's timestamp is more than 2* 10 minutes
genesis               724             // then allow mining of a min-difficulty block.
genesis               725             if (pblock->nTime - pindexLast->nTime > nTargetSpacing*2)
genesis               726                 return nProofOfWorkLimit;
genesis               727             else
genesis               728             {
genesis               729                 // Return the last non-special-min-difficulty-rules-block
genesis               730                 const CBlockIndex* pindex = pindexLast;
genesis               731                 while (pindex->pprev && pindex->nHeight % nInterval != 0 && pindex->nBits == nProofOfWorkLimit)
genesis               732                     pindex = pindex->pprev;
genesis               733                 return pindex->nBits;
genesis               734             }
genesis               735         }
genesis               736 
genesis               737         return pindexLast->nBits;
genesis               738     }
genesis               739 
genesis               740     // Go back by what we want to be 14 days worth of blocks
genesis               741     const CBlockIndex* pindexFirst = pindexLast;
genesis               742     for (int i = 0; pindexFirst && i < nInterval-1; i++)
genesis               743         pindexFirst = pindexFirst->pprev;
genesis               744     assert(pindexFirst);
genesis               745 
genesis               746     // Limit adjustment step
genesis               747     int64 nActualTimespan = pindexLast->GetBlockTime() - pindexFirst->GetBlockTime();
genesis               748     printf("  nActualTimespan = %"PRI64d"  before bounds\n", nActualTimespan);
genesis               749     if (nActualTimespan < nTargetTimespan/4)
genesis               750         nActualTimespan = nTargetTimespan/4;
genesis               751     if (nActualTimespan > nTargetTimespan*4)
genesis               752         nActualTimespan = nTargetTimespan*4;
genesis               753 
genesis               754     // Retarget
genesis               755     CBigNum bnNew;
genesis               756     bnNew.SetCompact(pindexLast->nBits);
genesis               757     bnNew *= nActualTimespan;
genesis               758     bnNew /= nTargetTimespan;
genesis               759 
genesis               760     if (bnNew > bnProofOfWorkLimit)
genesis               761         bnNew = bnProofOfWorkLimit;
genesis               762 
genesis               763     /// debug print
genesis               764     printf("GetNextWorkRequired RETARGET\n");
genesis               765     printf("nTargetTimespan = %"PRI64d"    nActualTimespan = %"PRI64d"\n", nTargetTimespan, nActualTimespan);
genesis               766     printf("Before: %08x  %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().ToString().c_str());
genesis               767     printf("After:  %08x  %s\n", bnNew.GetCompact(), bnNew.getuint256().ToString().c_str());
genesis               768 
genesis               769     return bnNew.GetCompact();
genesis               770 }
genesis               771 
genesis               772 bool CheckProofOfWork(uint256 hash, unsigned int nBits)
genesis               773 {
genesis               774     CBigNum bnTarget;
genesis               775     bnTarget.SetCompact(nBits);
genesis               776 
genesis               777     // Check range
genesis               778     if (bnTarget <= 0 || bnTarget > bnProofOfWorkLimit)
genesis               779         return error("CheckProofOfWork() : nBits below minimum work");
genesis               780 
genesis               781     // Check proof of work matches claimed amount
genesis               782     if (hash > bnTarget.getuint256())
genesis               783         return error("CheckProofOfWork() : hash doesn't match nBits");
genesis               784 
genesis               785     return true;
genesis               786 }
genesis               787 
genesis               788 // Return maximum amount of blocks that other nodes claim to have
genesis               789 int GetNumBlocksOfPeers()
genesis               790 {
genesis               791     return std::max(cPeerBlockCounts.median(), Checkpoints::GetTotalBlocksEstimate());
genesis               792 }
genesis               793 
genesis               794 bool IsInitialBlockDownload()
genesis               795 {
genesis               796     if (pindexBest == NULL || nBestHeight < Checkpoints::GetTotalBlocksEstimate())
genesis               797         return true;
genesis               798     static int64 nLastUpdate;
genesis               799     static CBlockIndex* pindexLastBest;
genesis               800     if (pindexBest != pindexLastBest)
genesis               801     {
genesis               802         pindexLastBest = pindexBest;
genesis               803         nLastUpdate = GetTime();
genesis               804     }
genesis               805     return (GetTime() - nLastUpdate < 10 &&
genesis               806             pindexBest->GetBlockTime() < GetTime() - 24 * 60 * 60);
genesis               807 }
genesis               808 
genesis               809 void static InvalidChainFound(CBlockIndex* pindexNew)
genesis               810 {
genesis               811     if (pindexNew->bnChainWork > bnBestInvalidWork)
genesis               812     {
genesis               813         bnBestInvalidWork = pindexNew->bnChainWork;
genesis               814         CTxDB().WriteBestInvalidWork(bnBestInvalidWork);
genesis               815         MainFrameRepaint();
genesis               816     }
genesis               817     printf("InvalidChainFound: invalid block=%s  height=%d  work=%s\n", pindexNew->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->nHeight, pindexNew->bnChainWork.ToString().c_str());
genesis               818     printf("InvalidChainFound:  current best=%s  height=%d  work=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainWork.ToString().c_str());
genesis               819     if (pindexBest && bnBestInvalidWork > bnBestChainWork + pindexBest->GetBlockWork() * 6)
genesis               820         printf("InvalidChainFound: WARNING: Displayed transactions may not be correct!  You may need to upgrade, or other nodes may need to upgrade.\n");
genesis               821 }
genesis               822 
genesis               823 
genesis               824 
genesis               825 
genesis               826 
genesis               827 
genesis               828 
genesis               829 
genesis               830 
genesis               831 
genesis               832 
genesis               833 bool CTransaction::DisconnectInputs(CTxDB& txdb)
genesis               834 {
genesis               835     // Relinquish previous transactions' spent pointers
genesis               836     if (!IsCoinBase())
genesis               837     {
genesis               838         BOOST_FOREACH(const CTxIn& txin, vin)
genesis               839         {
genesis               840             COutPoint prevout = txin.prevout;
genesis               841 
genesis               842             // Get prev txindex from disk
genesis               843             CTxIndex txindex;
genesis               844             if (!txdb.ReadTxIndex(prevout.hash, txindex))
genesis               845                 return error("DisconnectInputs() : ReadTxIndex failed");
genesis               846 
genesis               847             if (prevout.n >= txindex.vSpent.size())
genesis               848                 return error("DisconnectInputs() : prevout.n out of range");
genesis               849 
genesis               850             // Mark outpoint as not spent
genesis               851             txindex.vSpent[prevout.n].SetNull();
genesis               852 
genesis               853             // Write back
genesis               854             if (!txdb.UpdateTxIndex(prevout.hash, txindex))
genesis               855                 return error("DisconnectInputs() : UpdateTxIndex failed");
genesis               856         }
genesis               857     }
genesis               858 
genesis               859     // Remove transaction from index
genesis               860     // This can fail if a duplicate of this transaction was in a chain that got
genesis               861     // reorganized away. This is only possible if this transaction was completely
genesis               862     // spent, so erasing it would be a no-op anway.
genesis               863     txdb.EraseTxIndex(*this);
genesis               864 
genesis               865     return true;
genesis               866 }
genesis               867 
genesis               868 
genesis               869 bool CTransaction::ConnectInputs(CTxDB& txdb, map<uint256, CTxIndex>& mapTestPool, CDiskTxPos posThisTx,
genesis               870                                  CBlockIndex* pindexBlock, int64& nFees, bool fBlock, bool fMiner, int64 nMinFee,
genesis               871                                  bool& fInvalid)
genesis               872 {
genesis               873     // FetchInputs can return false either because we just haven't seen some inputs
genesis               874     // (in which case the transaction should be stored as an orphan)
genesis               875     // or because the transaction is malformed (in which case the transaction should
genesis               876     // be dropped).  If tx is definitely invalid, fInvalid will be set to true.
genesis               877     fInvalid = false;
genesis               878 
genesis               879     // Take over previous transactions' spent pointers
genesis               880     // fBlock is true when this is called from AcceptBlock when a new best-block is added to the blockchain
genesis               881     // fMiner is true when called from the internal bitcoin miner
genesis               882     // ... both are false when called from CTransaction::AcceptToMemoryPool
genesis               883     if (!IsCoinBase())
genesis               884     {
genesis               885         int64 nValueIn = 0;
genesis               886         for (int i = 0; i < vin.size(); i++)
genesis               887         {
genesis               888             COutPoint prevout = vin[i].prevout;
genesis               889 
genesis               890             // Read txindex
genesis               891             CTxIndex txindex;
genesis               892             bool fFound = true;
genesis               893             if ((fBlock || fMiner) && mapTestPool.count(prevout.hash))
genesis               894             {
genesis               895                 // Get txindex from current proposed changes
genesis               896                 txindex = mapTestPool[prevout.hash];
genesis               897             }
genesis               898             else
genesis               899             {
genesis               900                 // Read txindex from txdb
genesis               901                 fFound = txdb.ReadTxIndex(prevout.hash, txindex);
genesis               902             }
genesis               903             if (!fFound && (fBlock || fMiner))
genesis               904                 return fMiner ? false : error("ConnectInputs() : %s prev tx %s index entry not found", GetHash().ToString().substr(0,10).c_str(),  prevout.hash.ToString().substr(0,10).c_str());
genesis               905 
genesis               906             // Read txPrev
genesis               907             CTransaction txPrev;
genesis               908             if (!fFound || txindex.pos == CDiskTxPos(1,1,1))
genesis               909             {
genesis               910                 // Get prev tx from single transactions in memory
genesis               911                 CRITICAL_BLOCK(cs_mapTransactions)
genesis               912                 {
genesis               913                     if (!mapTransactions.count(prevout.hash))
genesis               914                         return error("ConnectInputs() : %s mapTransactions prev not found %s", GetHash().ToString().substr(0,10).c_str(),  prevout.hash.ToString().substr(0,10).c_str());
genesis               915                     txPrev = mapTransactions[prevout.hash];
genesis               916                 }
genesis               917                 if (!fFound)
genesis               918                     txindex.vSpent.resize(txPrev.vout.size());
genesis               919             }
genesis               920             else
genesis               921             {
genesis               922                 // Get prev tx from disk
genesis               923                 if (!txPrev.ReadFromDisk(txindex.pos))
genesis               924                     return error("ConnectInputs() : %s ReadFromDisk prev tx %s failed", GetHash().ToString().substr(0,10).c_str(),  prevout.hash.ToString().substr(0,10).c_str());
genesis               925             }
genesis               926 
genesis               927             if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
genesis               928             {
genesis               929                 // Revisit this if/when transaction replacement is implemented and allows
genesis               930                 // adding inputs:
genesis               931                 fInvalid = true;
genesis               932                 return DoS(100, error("ConnectInputs() : %s prevout.n out of range %d %d %d prev tx %s\n%s", GetHash().ToString().substr(0,10).c_str(), prevout.n, txPrev.vout.size(), txindex.vSpent.size(), prevout.hash.ToString().substr(0,10).c_str(), txPrev.ToString().c_str()));
genesis               933             }
genesis               934 
genesis               935             // If prev is coinbase, check that it's matured
genesis               936             if (txPrev.IsCoinBase())
genesis               937                 for (CBlockIndex* pindex = pindexBlock; pindex && pindexBlock->nHeight - pindex->nHeight < COINBASE_MATURITY; pindex = pindex->pprev)
genesis               938                     if (pindex->nBlockPos == txindex.pos.nBlockPos && pindex->nFile == txindex.pos.nFile)
genesis               939                         return error("ConnectInputs() : tried to spend coinbase at depth %d", pindexBlock->nHeight - pindex->nHeight);
genesis               940 
genesis               941             // Skip ECDSA signature verification when connecting blocks (fBlock=true)
genesis               942             // before the last blockchain checkpoint. This is safe because block merkle hashes are
genesis               943             // still computed and checked, and any change will be caught at the next checkpoint.
genesis               944             if (!(fBlock && (nBestHeight < Checkpoints::GetTotalBlocksEstimate())))
genesis               945                 // Verify signature
genesis               946                 if (!VerifySignature(txPrev, *this, i))
genesis               947                     return DoS(100,error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str()));
genesis               948 
genesis               949             // Check for conflicts (double-spend)
genesis               950             // This doesn't trigger the DoS code on purpose; if it did, it would make it easier
genesis               951             // for an attacker to attempt to split the network.
genesis               952             if (!txindex.vSpent[prevout.n].IsNull())
genesis               953                 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());
genesis               954 
genesis               955             // Check for negative or overflow input values
genesis               956             nValueIn += txPrev.vout[prevout.n].nValue;
genesis               957             if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
genesis               958                 return DoS(100, error("ConnectInputs() : txin values out of range"));
genesis               959 
genesis               960             // Mark outpoints as spent
genesis               961             txindex.vSpent[prevout.n] = posThisTx;
genesis               962 
genesis               963             // Write back
genesis               964             if (fBlock || fMiner)
genesis               965             {
genesis               966                 mapTestPool[prevout.hash] = txindex;
genesis               967             }
genesis               968         }
genesis               969 
genesis               970         if (nValueIn < GetValueOut())
genesis               971             return DoS(100, error("ConnectInputs() : %s value in < value out", GetHash().ToString().substr(0,10).c_str()));
genesis               972 
genesis               973         // Tally transaction fees
genesis               974         int64 nTxFee = nValueIn - GetValueOut();
genesis               975         if (nTxFee < 0)
genesis               976             return DoS(100, error("ConnectInputs() : %s nTxFee < 0", GetHash().ToString().substr(0,10).c_str()));
genesis               977         if (nTxFee < nMinFee)
genesis               978             return false;
genesis               979         nFees += nTxFee;
genesis               980         if (!MoneyRange(nFees))
genesis               981             return DoS(100, error("ConnectInputs() : nFees out of range"));
genesis               982     }
genesis               983 
genesis               984     if (fBlock)
genesis               985     {
genesis               986         // Add transaction to changes
genesis               987         mapTestPool[GetHash()] = CTxIndex(posThisTx, vout.size());
genesis               988     }
genesis               989     else if (fMiner)
genesis               990     {
genesis               991         // Add transaction to test pool
genesis               992         mapTestPool[GetHash()] = CTxIndex(CDiskTxPos(1,1,1), vout.size());
genesis               993     }
genesis               994 
genesis               995     return true;
genesis               996 }
genesis               997 
genesis               998 
genesis               999 bool CTransaction::ClientConnectInputs()
genesis              1000 {
genesis              1001     if (IsCoinBase())
genesis              1002         return false;
genesis              1003 
genesis              1004     // Take over previous transactions' spent pointers
genesis              1005     CRITICAL_BLOCK(cs_mapTransactions)
genesis              1006     {
genesis              1007         int64 nValueIn = 0;
genesis              1008         for (int i = 0; i < vin.size(); i++)
genesis              1009         {
genesis              1010             // Get prev tx from single transactions in memory
genesis              1011             COutPoint prevout = vin[i].prevout;
genesis              1012             if (!mapTransactions.count(prevout.hash))
genesis              1013                 return false;
genesis              1014             CTransaction& txPrev = mapTransactions[prevout.hash];
genesis              1015 
genesis              1016             if (prevout.n >= txPrev.vout.size())
genesis              1017                 return false;
genesis              1018 
genesis              1019             // Verify signature
genesis              1020             if (!VerifySignature(txPrev, *this, i))
genesis              1021                 return error("ConnectInputs() : VerifySignature failed");
genesis              1022 
genesis              1023             ///// this is redundant with the mapNextTx stuff, not sure which I want to get rid of
genesis              1024             ///// this has to go away now that posNext is gone
genesis              1025             // // Check for conflicts
genesis              1026             // if (!txPrev.vout[prevout.n].posNext.IsNull())
genesis              1027             //     return error("ConnectInputs() : prev tx already used");
genesis              1028             //
genesis              1029             // // Flag outpoints as used
genesis              1030             // txPrev.vout[prevout.n].posNext = posThisTx;
genesis              1031 
genesis              1032             nValueIn += txPrev.vout[prevout.n].nValue;
genesis              1033 
genesis              1034             if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
genesis              1035                 return error("ClientConnectInputs() : txin values out of range");
genesis              1036         }
genesis              1037         if (GetValueOut() > nValueIn)
genesis              1038             return false;
genesis              1039     }
genesis              1040 
genesis              1041     return true;
genesis              1042 }
genesis              1043 
genesis              1044 
genesis              1045 
genesis              1046 
genesis              1047 bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
genesis              1048 {
genesis              1049     // Disconnect in reverse order
genesis              1050     for (int i = vtx.size()-1; i >= 0; i--)
genesis              1051         if (!vtx[i].DisconnectInputs(txdb))
genesis              1052             return false;
genesis              1053 
genesis              1054     // Update block index on disk without changing it in memory.
genesis              1055     // The memory index structure will be changed after the db commits.
genesis              1056     if (pindex->pprev)
genesis              1057     {
genesis              1058         CDiskBlockIndex blockindexPrev(pindex->pprev);
genesis              1059         blockindexPrev.hashNext = 0;
genesis              1060         if (!txdb.WriteBlockIndex(blockindexPrev))
genesis              1061             return error("DisconnectBlock() : WriteBlockIndex failed");
genesis              1062     }
genesis              1063 
genesis              1064     return true;
genesis              1065 }
genesis              1066 
genesis              1067 bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
genesis              1068 {
genesis              1069     // Check it again in case a previous version let a bad block in
genesis              1070     if (!CheckBlock())
genesis              1071         return false;
genesis              1072 
genesis              1073     // Do not allow blocks that contain transactions which 'overwrite' older transactions,
genesis              1074     // unless those are already completely spent.
genesis              1075     // If such overwrites are allowed, coinbases and transactions depending upon those
genesis              1076     // can be duplicated to remove the ability to spend the first instance -- even after
genesis              1077     // being sent to another address.
genesis              1078     // See BIP30 and http://r6.ca/blog/20120206T005236Z.html for more information.
genesis              1079     // This logic is not necessary for memory pool transactions, as AcceptToMemoryPool
genesis              1080     // already refuses previously-known transaction id's entirely.
genesis              1081     // This rule applies to all blocks whose timestamp is after March 15, 2012, 0:00 UTC.
genesis              1082     // On testnet it is enabled as of februari 20, 2012, 0:00 UTC.
genesis              1083     if (pindex->nTime > 1331769600 || (fTestNet && pindex->nTime > 1329696000))
genesis              1084         BOOST_FOREACH(CTransaction& tx, vtx)
genesis              1085         {
genesis              1086             CTxIndex txindexOld;
genesis              1087             if (txdb.ReadTxIndex(tx.GetHash(), txindexOld))
genesis              1088                 BOOST_FOREACH(CDiskTxPos &pos, txindexOld.vSpent)
genesis              1089                     if (pos.IsNull())
genesis              1090                         return false;
genesis              1091         }
genesis              1092 
genesis              1093     //// issue here: it doesn't know the version
genesis              1094     unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK) - 1 + GetSizeOfCompactSize(vtx.size());
genesis              1095 
genesis              1096     map<uint256, CTxIndex> mapQueuedChanges;
genesis              1097     int64 nFees = 0;
genesis              1098     BOOST_FOREACH(CTransaction& tx, vtx)
genesis              1099     {
genesis              1100         CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
genesis              1101         nTxPos += ::GetSerializeSize(tx, SER_DISK);
genesis              1102 
genesis              1103         bool fInvalid;
genesis              1104         if (!tx.ConnectInputs(txdb, mapQueuedChanges, posThisTx, pindex, nFees, true, false, 0, fInvalid))
genesis              1105             return false;
genesis              1106     }
genesis              1107     // Write queued txindex changes
genesis              1108     for (map<uint256, CTxIndex>::iterator mi = mapQueuedChanges.begin(); mi != mapQueuedChanges.end(); ++mi)
genesis              1109     {
genesis              1110         if (!txdb.UpdateTxIndex((*mi).first, (*mi).second))
genesis              1111             return error("ConnectBlock() : UpdateTxIndex failed");
genesis              1112     }
genesis              1113 
genesis              1114     if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
genesis              1115         return false;
genesis              1116 
genesis              1117     // Update block index on disk without changing it in memory.
genesis              1118     // The memory index structure will be changed after the db commits.
genesis              1119     if (pindex->pprev)
genesis              1120     {
genesis              1121         CDiskBlockIndex blockindexPrev(pindex->pprev);
genesis              1122         blockindexPrev.hashNext = pindex->GetBlockHash();
genesis              1123         if (!txdb.WriteBlockIndex(blockindexPrev))
genesis              1124             return error("ConnectBlock() : WriteBlockIndex failed");
genesis              1125     }
genesis              1126 
genesis              1127     // Watch for transactions paying to me
genesis              1128     BOOST_FOREACH(CTransaction& tx, vtx)
genesis              1129         SyncWithWallets(tx, this, true);
genesis              1130 
genesis              1131     return true;
genesis              1132 }
genesis              1133 
genesis              1134 bool static Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
genesis              1135 {
genesis              1136     printf("REORGANIZE\n");
genesis              1137 
genesis              1138     // Find the fork
genesis              1139     CBlockIndex* pfork = pindexBest;
genesis              1140     CBlockIndex* plonger = pindexNew;
genesis              1141     while (pfork != plonger)
genesis              1142     {
genesis              1143         while (plonger->nHeight > pfork->nHeight)
genesis              1144             if (!(plonger = plonger->pprev))
genesis              1145                 return error("Reorganize() : plonger->pprev is null");
genesis              1146         if (pfork == plonger)
genesis              1147             break;
genesis              1148         if (!(pfork = pfork->pprev))
genesis              1149             return error("Reorganize() : pfork->pprev is null");
genesis              1150     }
genesis              1151 
genesis              1152     // List of what to disconnect
genesis              1153     vector<CBlockIndex*> vDisconnect;
genesis              1154     for (CBlockIndex* pindex = pindexBest; pindex != pfork; pindex = pindex->pprev)
genesis              1155         vDisconnect.push_back(pindex);
genesis              1156 
genesis              1157     // List of what to connect
genesis              1158     vector<CBlockIndex*> vConnect;
genesis              1159     for (CBlockIndex* pindex = pindexNew; pindex != pfork; pindex = pindex->pprev)
genesis              1160         vConnect.push_back(pindex);
genesis              1161     reverse(vConnect.begin(), vConnect.end());
genesis              1162 
genesis              1163     // Disconnect shorter branch
genesis              1164     vector<CTransaction> vResurrect;
genesis              1165     BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
genesis              1166     {
genesis              1167         CBlock block;
genesis              1168         if (!block.ReadFromDisk(pindex))
genesis              1169             return error("Reorganize() : ReadFromDisk for disconnect failed");
genesis              1170         if (!block.DisconnectBlock(txdb, pindex))
genesis              1171             return error("Reorganize() : DisconnectBlock failed");
genesis              1172 
genesis              1173         // Queue memory transactions to resurrect
genesis              1174         BOOST_FOREACH(const CTransaction& tx, block.vtx)
genesis              1175             if (!tx.IsCoinBase())
genesis              1176                 vResurrect.push_back(tx);
genesis              1177     }
genesis              1178 
genesis              1179     // Connect longer branch
genesis              1180     vector<CTransaction> vDelete;
genesis              1181     for (int i = 0; i < vConnect.size(); i++)
genesis              1182     {
genesis              1183         CBlockIndex* pindex = vConnect[i];
genesis              1184         CBlock block;
genesis              1185         if (!block.ReadFromDisk(pindex))
genesis              1186             return error("Reorganize() : ReadFromDisk for connect failed");
genesis              1187         if (!block.ConnectBlock(txdb, pindex))
genesis              1188         {
genesis              1189             // Invalid block
genesis              1190             txdb.TxnAbort();
genesis              1191             return error("Reorganize() : ConnectBlock failed");
genesis              1192         }
genesis              1193 
genesis              1194         // Queue memory transactions to delete
genesis              1195         BOOST_FOREACH(const CTransaction& tx, block.vtx)
genesis              1196             vDelete.push_back(tx);
genesis              1197     }
genesis              1198     if (!txdb.WriteHashBestChain(pindexNew->GetBlockHash()))
genesis              1199         return error("Reorganize() : WriteHashBestChain failed");
genesis              1200 
genesis              1201     // Make sure it's successfully written to disk before changing memory structure
genesis              1202     if (!txdb.TxnCommit())
genesis              1203         return error("Reorganize() : TxnCommit failed");
genesis              1204 
genesis              1205     // Disconnect shorter branch
genesis              1206     BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
genesis              1207         if (pindex->pprev)
genesis              1208             pindex->pprev->pnext = NULL;
genesis              1209 
genesis              1210     // Connect longer branch
genesis              1211     BOOST_FOREACH(CBlockIndex* pindex, vConnect)
genesis              1212         if (pindex->pprev)
genesis              1213             pindex->pprev->pnext = pindex;
genesis              1214 
genesis              1215     // Resurrect memory transactions that were in the disconnected branch
genesis              1216     BOOST_FOREACH(CTransaction& tx, vResurrect)
genesis              1217         tx.AcceptToMemoryPool(txdb, false);
genesis              1218 
genesis              1219     // Delete redundant memory transactions that are in the connected branch
genesis              1220     BOOST_FOREACH(CTransaction& tx, vDelete)
genesis              1221         tx.RemoveFromMemoryPool();
genesis              1222 
genesis              1223     return true;
genesis              1224 }
genesis              1225 
genesis              1226 
genesis              1227 bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
genesis              1228 {
genesis              1229     uint256 hash = GetHash();
genesis              1230 
genesis              1231     txdb.TxnBegin();
genesis              1232     if (pindexGenesisBlock == NULL && hash == hashGenesisBlock)
genesis              1233     {
genesis              1234         txdb.WriteHashBestChain(hash);
genesis              1235         if (!txdb.TxnCommit())
genesis              1236             return error("SetBestChain() : TxnCommit failed");
genesis              1237         pindexGenesisBlock = pindexNew;
genesis              1238     }
genesis              1239     else if (hashPrevBlock == hashBestChain)
genesis              1240     {
genesis              1241         // Adding to current best branch
genesis              1242         if (!ConnectBlock(txdb, pindexNew) || !txdb.WriteHashBestChain(hash))
genesis              1243         {
genesis              1244             txdb.TxnAbort();
genesis              1245             InvalidChainFound(pindexNew);
genesis              1246             return error("SetBestChain() : ConnectBlock failed");
genesis              1247         }
genesis              1248         if (!txdb.TxnCommit())
genesis              1249             return error("SetBestChain() : TxnCommit failed");
genesis              1250 
genesis              1251         // Add to current best branch
genesis              1252         pindexNew->pprev->pnext = pindexNew;
genesis              1253 
genesis              1254         // Delete redundant memory transactions
genesis              1255         BOOST_FOREACH(CTransaction& tx, vtx)
genesis              1256             tx.RemoveFromMemoryPool();
genesis              1257     }
genesis              1258     else
genesis              1259     {
genesis              1260         // New best branch
genesis              1261         if (!Reorganize(txdb, pindexNew))
genesis              1262         {
genesis              1263             txdb.TxnAbort();
genesis              1264             InvalidChainFound(pindexNew);
genesis              1265             return error("SetBestChain() : Reorganize failed");
genesis              1266         }
genesis              1267     }
genesis              1268 
genesis              1269     // Update best block in wallet (so we can detect restored wallets)
genesis              1270     if (!IsInitialBlockDownload())
genesis              1271     {
genesis              1272         const CBlockLocator locator(pindexNew);
genesis              1273         ::SetBestChain(locator);
genesis              1274     }
genesis              1275 
genesis              1276     // New best block
genesis              1277     hashBestChain = hash;
genesis              1278     pindexBest = pindexNew;
genesis              1279     nBestHeight = pindexBest->nHeight;
genesis              1280     bnBestChainWork = pindexNew->bnChainWork;
genesis              1281     nTimeBestReceived = GetTime();
genesis              1282     nTransactionsUpdated++;
genesis              1283     printf("SetBestChain: new best=%s  height=%d  work=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainWork.ToString().c_str());
genesis              1284 
genesis              1285     return true;
genesis              1286 }
genesis              1287 
genesis              1288 
genesis              1289 bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
genesis              1290 {
genesis              1291     // Check for duplicate
genesis              1292     uint256 hash = GetHash();
genesis              1293     if (mapBlockIndex.count(hash))
genesis              1294         return error("AddToBlockIndex() : %s already exists", hash.ToString().substr(0,20).c_str());
genesis              1295 
genesis              1296     // Construct new block index object
genesis              1297     CBlockIndex* pindexNew = new CBlockIndex(nFile, nBlockPos, *this);
genesis              1298     if (!pindexNew)
genesis              1299         return error("AddToBlockIndex() : new CBlockIndex failed");
genesis              1300     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
genesis              1301     pindexNew->phashBlock = &((*mi).first);
genesis              1302     map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(hashPrevBlock);
genesis              1303     if (miPrev != mapBlockIndex.end())
genesis              1304     {
genesis              1305         pindexNew->pprev = (*miPrev).second;
genesis              1306         pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
genesis              1307     }
genesis              1308     pindexNew->bnChainWork = (pindexNew->pprev ? pindexNew->pprev->bnChainWork : 0) + pindexNew->GetBlockWork();
genesis              1309 
genesis              1310     CTxDB txdb;
genesis              1311     txdb.TxnBegin();
genesis              1312     txdb.WriteBlockIndex(CDiskBlockIndex(pindexNew));
genesis              1313     if (!txdb.TxnCommit())
genesis              1314         return false;
genesis              1315 
genesis              1316     // New best
genesis              1317     if (pindexNew->bnChainWork > bnBestChainWork)
genesis              1318         if (!SetBestChain(txdb, pindexNew))
genesis              1319             return false;
genesis              1320 
genesis              1321     txdb.Close();
genesis              1322 
genesis              1323     if (pindexNew == pindexBest)
genesis              1324     {
genesis              1325         // Notify UI to display prev block's coinbase if it was ours
genesis              1326         static uint256 hashPrevBestCoinBase;
genesis              1327         UpdatedTransaction(hashPrevBestCoinBase);
genesis              1328         hashPrevBestCoinBase = vtx[0].GetHash();
genesis              1329     }
genesis              1330 
genesis              1331     MainFrameRepaint();
genesis              1332     return true;
genesis              1333 }
genesis              1334 
genesis              1335 
genesis              1336 
genesis              1337 
genesis              1338 bool CBlock::CheckBlock() const
genesis              1339 {
genesis              1340     // These are checks that are independent of context
genesis              1341     // that can be verified before saving an orphan block.
genesis              1342 
genesis              1343     // Size limits
genesis              1344     if (vtx.empty() || vtx.size() > MAX_BLOCK_SIZE || ::GetSerializeSize(*this, SER_NETWORK) > MAX_BLOCK_SIZE)
genesis              1345         return DoS(100, error("CheckBlock() : size limits failed"));
genesis              1346 
genesis              1347     // Check proof of work matches claimed amount
genesis              1348     if (!CheckProofOfWork(GetHash(), nBits))
genesis              1349         return DoS(50, error("CheckBlock() : proof of work failed"));
genesis              1350 
genesis              1351     // Check timestamp
genesis              1352     if (GetBlockTime() > GetAdjustedTime() + 2 * 60 * 60)
genesis              1353         return error("CheckBlock() : block timestamp too far in the future");
genesis              1354 
genesis              1355     // First transaction must be coinbase, the rest must not be
genesis              1356     if (vtx.empty() || !vtx[0].IsCoinBase())
genesis              1357         return DoS(100, error("CheckBlock() : first tx is not coinbase"));
genesis              1358     for (int i = 1; i < vtx.size(); i++)
genesis              1359         if (vtx[i].IsCoinBase())
genesis              1360             return DoS(100, error("CheckBlock() : more than one coinbase"));
genesis              1361 
genesis              1362     // Check transactions
genesis              1363     BOOST_FOREACH(const CTransaction& tx, vtx)
genesis              1364         if (!tx.CheckTransaction())
genesis              1365             return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed"));
genesis              1366 
genesis              1367     // Check that it's not full of nonstandard transactions
genesis              1368     if (GetSigOpCount() > MAX_BLOCK_SIGOPS)
genesis              1369         return DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"));
genesis              1370 
genesis              1371     // Check merkleroot
genesis              1372     if (hashMerkleRoot != BuildMerkleTree())
genesis              1373         return DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
genesis              1374 
genesis              1375     return true;
genesis              1376 }
genesis              1377 
genesis              1378 bool CBlock::AcceptBlock()
genesis              1379 {
genesis              1380     // Check for duplicate
genesis              1381     uint256 hash = GetHash();
genesis              1382     if (mapBlockIndex.count(hash))
genesis              1383         return error("AcceptBlock() : block already in mapBlockIndex");
genesis              1384 
genesis              1385     // Get prev block index
genesis              1386     map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
genesis              1387     if (mi == mapBlockIndex.end())
genesis              1388         return DoS(10, error("AcceptBlock() : prev block not found"));
genesis              1389     CBlockIndex* pindexPrev = (*mi).second;
genesis              1390     int nHeight = pindexPrev->nHeight+1;
genesis              1391 
genesis              1392     // Check proof of work
genesis              1393     if (nBits != GetNextWorkRequired(pindexPrev, this))
genesis              1394         return DoS(100, error("AcceptBlock() : incorrect proof of work"));
genesis              1395 
genesis              1396     // Check timestamp against prev
genesis              1397     if (GetBlockTime() <= pindexPrev->GetMedianTimePast())
genesis              1398         return error("AcceptBlock() : block's timestamp is too early");
genesis              1399 
genesis              1400     // Check that all transactions are finalized
genesis              1401     BOOST_FOREACH(const CTransaction& tx, vtx)
genesis              1402         if (!tx.IsFinal(nHeight, GetBlockTime()))
genesis              1403             return DoS(10, error("AcceptBlock() : contains a non-final transaction"));
genesis              1404 
genesis              1405     // Check that the block chain matches the known block chain up to a checkpoint
genesis              1406     if (!Checkpoints::CheckBlock(nHeight, hash))
genesis              1407         return DoS(100, error("AcceptBlock() : rejected by checkpoint lockin at %d", nHeight));
genesis              1408 
genesis              1409     // Write block to history file
genesis              1410     if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK)))
genesis              1411         return error("AcceptBlock() : out of disk space");
genesis              1412     unsigned int nFile = -1;
genesis              1413     unsigned int nBlockPos = 0;
genesis              1414     if (!WriteToDisk(nFile, nBlockPos))
genesis              1415         return error("AcceptBlock() : WriteToDisk failed");
genesis              1416     if (!AddToBlockIndex(nFile, nBlockPos))
genesis              1417         return error("AcceptBlock() : AddToBlockIndex failed");
genesis              1418 
genesis              1419     // Relay inventory, but don't relay old inventory during initial block download
genesis              1420     if (hashBestChain == hash)
genesis              1421         CRITICAL_BLOCK(cs_vNodes)
genesis              1422             BOOST_FOREACH(CNode* pnode, vNodes)
genesis              1423                 if (nBestHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : 140700))
genesis              1424                     pnode->PushInventory(CInv(MSG_BLOCK, hash));
genesis              1425 
genesis              1426     return true;
genesis              1427 }
genesis              1428 
genesis              1429 bool ProcessBlock(CNode* pfrom, CBlock* pblock)
genesis              1430 {
genesis              1431     // Check for duplicate
genesis              1432     uint256 hash = pblock->GetHash();
genesis              1433     if (mapBlockIndex.count(hash))
genesis              1434         return error("ProcessBlock() : already have block %d %s", mapBlockIndex[hash]->nHeight, hash.ToString().substr(0,20).c_str());
genesis              1435     if (mapOrphanBlocks.count(hash))
genesis              1436         return error("ProcessBlock() : already have block (orphan) %s", hash.ToString().substr(0,20).c_str());
genesis              1437 
genesis              1438     // Preliminary checks
genesis              1439     if (!pblock->CheckBlock())
genesis              1440         return error("ProcessBlock() : CheckBlock FAILED");
genesis              1441 
genesis              1442     CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(mapBlockIndex);
genesis              1443     if (pcheckpoint && pblock->hashPrevBlock != hashBestChain)
genesis              1444     {
genesis              1445         // Extra checks to prevent "fill up memory by spamming with bogus blocks"
genesis              1446         int64 deltaTime = pblock->GetBlockTime() - pcheckpoint->nTime;
genesis              1447         if (deltaTime < 0)
genesis              1448         {
genesis              1449             if (pfrom)
genesis              1450                 pfrom->Misbehaving(100);
genesis              1451             return error("ProcessBlock() : block with timestamp before last checkpoint");
genesis              1452         }
genesis              1453         CBigNum bnNewBlock;
genesis              1454         bnNewBlock.SetCompact(pblock->nBits);
genesis              1455         CBigNum bnRequired;
genesis              1456         bnRequired.SetCompact(ComputeMinWork(pcheckpoint->nBits, deltaTime));
genesis              1457         if (bnNewBlock > bnRequired)
genesis              1458         {
genesis              1459             if (pfrom)
genesis              1460                 pfrom->Misbehaving(100);
genesis              1461             return error("ProcessBlock() : block with too little proof-of-work");
genesis              1462         }
genesis              1463     }
genesis              1464 
genesis              1465 
genesis              1466     // If don't already have its previous block, shunt it off to holding area until we get it
genesis              1467     if (!mapBlockIndex.count(pblock->hashPrevBlock))
genesis              1468     {
genesis              1469         printf("ProcessBlock: ORPHAN BLOCK, prev=%s\n", pblock->hashPrevBlock.ToString().substr(0,20).c_str());
genesis              1470         CBlock* pblock2 = new CBlock(*pblock);
genesis              1471         mapOrphanBlocks.insert(make_pair(hash, pblock2));
genesis              1472         mapOrphanBlocksByPrev.insert(make_pair(pblock2->hashPrevBlock, pblock2));
genesis              1473 
genesis              1474         // Ask this guy to fill in what we're missing
genesis              1475         if (pfrom)
genesis              1476             pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(pblock2));
genesis              1477         return true;
genesis              1478     }
genesis              1479 
genesis              1480     // Store to disk
genesis              1481     if (!pblock->AcceptBlock())
genesis              1482         return error("ProcessBlock() : AcceptBlock FAILED");
genesis              1483 
genesis              1484     // Recursively process any orphan blocks that depended on this one
genesis              1485     vector<uint256> vWorkQueue;
genesis              1486     vWorkQueue.push_back(hash);
genesis              1487     for (int i = 0; i < vWorkQueue.size(); i++)
genesis              1488     {
genesis              1489         uint256 hashPrev = vWorkQueue[i];
genesis              1490         for (multimap<uint256, CBlock*>::iterator mi = mapOrphanBlocksByPrev.lower_bound(hashPrev);
genesis              1491              mi != mapOrphanBlocksByPrev.upper_bound(hashPrev);
genesis              1492              ++mi)
genesis              1493         {
genesis              1494             CBlock* pblockOrphan = (*mi).second;
genesis              1495             if (pblockOrphan->AcceptBlock())
genesis              1496                 vWorkQueue.push_back(pblockOrphan->GetHash());
genesis              1497             mapOrphanBlocks.erase(pblockOrphan->GetHash());
genesis              1498             delete pblockOrphan;
genesis              1499         }
genesis              1500         mapOrphanBlocksByPrev.erase(hashPrev);
genesis              1501     }
genesis              1502 
genesis              1503     printf("ProcessBlock: ACCEPTED\n");
genesis              1504     return true;
genesis              1505 }
genesis              1506 
genesis              1507 
genesis              1508 
genesis              1509 
genesis              1510 
genesis              1511 
genesis              1512 
genesis              1513 
genesis              1514 bool CheckDiskSpace(uint64 nAdditionalBytes)
genesis              1515 {
genesis              1516     uint64 nFreeBytesAvailable = filesystem::space(GetDataDir()).available;
genesis              1517 
genesis              1518     // Check for 15MB because database could create another 10MB log file at any time
genesis              1519     if (nFreeBytesAvailable < (uint64)15000000 + nAdditionalBytes)
genesis              1520     {
genesis              1521         fShutdown = true;
genesis              1522         string strMessage = _("Warning: Disk space is low  ");
genesis              1523         strMiscWarning = strMessage;
genesis              1524         printf("*** %s\n", strMessage.c_str());
genesis              1525         ThreadSafeMessageBox(strMessage, "Bitcoin", wxOK | wxICON_EXCLAMATION);
genesis              1526         CreateThread(Shutdown, NULL);
genesis              1527         return false;
genesis              1528     }
genesis              1529     return true;
genesis              1530 }
genesis              1531 
genesis              1532 FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode)
genesis              1533 {
genesis              1534     if (nFile == -1)
genesis              1535         return NULL;
genesis              1536     FILE* file = fopen(strprintf("%s/blk%04d.dat", GetDataDir().c_str(), nFile).c_str(), pszMode);
genesis              1537     if (!file)
genesis              1538         return NULL;
genesis              1539     if (nBlockPos != 0 && !strchr(pszMode, 'a') && !strchr(pszMode, 'w'))
genesis              1540     {
genesis              1541         if (fseek(file, nBlockPos, SEEK_SET) != 0)
genesis              1542         {
genesis              1543             fclose(file);
genesis              1544             return NULL;
genesis              1545         }
genesis              1546     }
genesis              1547     return file;
genesis              1548 }
genesis              1549 
genesis              1550 static unsigned int nCurrentBlockFile = 1;
genesis              1551 
genesis              1552 FILE* AppendBlockFile(unsigned int& nFileRet)
genesis              1553 {
genesis              1554     nFileRet = 0;
genesis              1555     loop
genesis              1556     {
genesis              1557         FILE* file = OpenBlockFile(nCurrentBlockFile, 0, "ab");
genesis              1558         if (!file)
genesis              1559             return NULL;
genesis              1560         if (fseek(file, 0, SEEK_END) != 0)
genesis              1561             return NULL;
genesis              1562         // FAT32 filesize max 4GB, fseek and ftell max 2GB, so we must stay under 2GB
genesis              1563         if (ftell(file) < 0x7F000000 - MAX_SIZE)
genesis              1564         {
genesis              1565             nFileRet = nCurrentBlockFile;
genesis              1566             return file;
genesis              1567         }
genesis              1568         fclose(file);
genesis              1569         nCurrentBlockFile++;
genesis              1570     }
genesis              1571 }
genesis              1572 
genesis              1573 bool LoadBlockIndex(bool fAllowNew)
genesis              1574 {
genesis              1575     if (fTestNet)
genesis              1576     {
genesis              1577         hashGenesisBlock = uint256("0x00000007199508e34a9ff81e6ec0c477a4cccff2a4767a8eee39c11db367b008");
genesis              1578         bnProofOfWorkLimit = CBigNum(~uint256(0) >> 28);
genesis              1579         pchMessageStart[0] = 0xfa;
genesis              1580         pchMessageStart[1] = 0xbf;
genesis              1581         pchMessageStart[2] = 0xb5;
genesis              1582         pchMessageStart[3] = 0xda;
genesis              1583     }
genesis              1584 
genesis              1585     //
genesis              1586     // Load block index
genesis              1587     //
genesis              1588     CTxDB txdb("cr");
genesis              1589     if (!txdb.LoadBlockIndex())
genesis              1590         return false;
genesis              1591     txdb.Close();
genesis              1592 
genesis              1593     //
genesis              1594     // Init with genesis block
genesis              1595     //
genesis              1596     if (mapBlockIndex.empty())
genesis              1597     {
genesis              1598         if (!fAllowNew)
genesis              1599             return false;
genesis              1600 
genesis              1601         // Genesis Block:
genesis              1602         // CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
genesis              1603         //   CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
genesis              1604         //     CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
genesis              1605         //     CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
genesis              1606         //   vMerkleTree: 4a5e1e
genesis              1607 
genesis              1608         // Genesis block
genesis              1609         const char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
genesis              1610         CTransaction txNew;
genesis              1611         txNew.vin.resize(1);
genesis              1612         txNew.vout.resize(1);
genesis              1613         txNew.vin[0].scriptSig = CScript() << 486604799 << CBigNum(4) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
genesis              1614         txNew.vout[0].nValue = 50 * COIN;
genesis              1615         txNew.vout[0].scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
genesis              1616         CBlock block;
genesis              1617         block.vtx.push_back(txNew);
genesis              1618         block.hashPrevBlock = 0;
genesis              1619         block.hashMerkleRoot = block.BuildMerkleTree();
genesis              1620         block.nVersion = 1;
genesis              1621         block.nTime    = 1231006505;
genesis              1622         block.nBits    = 0x1d00ffff;
genesis              1623         block.nNonce   = 2083236893;
genesis              1624 
genesis              1625         if (fTestNet)
genesis              1626         {
genesis              1627             block.nTime    = 1296688602;
genesis              1628             block.nBits    = 0x1d07fff8;
genesis              1629             block.nNonce   = 384568319;
genesis              1630         }
genesis              1631 
genesis              1632         //// debug print
genesis              1633         printf("%s\n", block.GetHash().ToString().c_str());
genesis              1634         printf("%s\n", hashGenesisBlock.ToString().c_str());
genesis              1635         printf("%s\n", block.hashMerkleRoot.ToString().c_str());
genesis              1636         assert(block.hashMerkleRoot == uint256("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
genesis              1637         block.print();
genesis              1638         assert(block.GetHash() == hashGenesisBlock);
genesis              1639 
genesis              1640         // Start new block file
genesis              1641         unsigned int nFile;
genesis              1642         unsigned int nBlockPos;
genesis              1643         if (!block.WriteToDisk(nFile, nBlockPos))
genesis              1644             return error("LoadBlockIndex() : writing genesis block to disk failed");
genesis              1645         if (!block.AddToBlockIndex(nFile, nBlockPos))
genesis              1646             return error("LoadBlockIndex() : genesis block not accepted");
genesis              1647     }
genesis              1648 
genesis              1649     return true;
genesis              1650 }
genesis              1651 
genesis              1652 
genesis              1653 
genesis              1654 void PrintBlockTree()
genesis              1655 {
genesis              1656     // precompute tree structure
genesis              1657     map<CBlockIndex*, vector<CBlockIndex*> > mapNext;
genesis              1658     for (map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
genesis              1659     {
genesis              1660         CBlockIndex* pindex = (*mi).second;
genesis              1661         mapNext[pindex->pprev].push_back(pindex);
genesis              1662         // test
genesis              1663         //while (rand() % 3 == 0)
genesis              1664         //    mapNext[pindex->pprev].push_back(pindex);
genesis              1665     }
genesis              1666 
genesis              1667     vector<pair<int, CBlockIndex*> > vStack;
genesis              1668     vStack.push_back(make_pair(0, pindexGenesisBlock));
genesis              1669 
genesis              1670     int nPrevCol = 0;
genesis              1671     while (!vStack.empty())
genesis              1672     {
genesis              1673         int nCol = vStack.back().first;
genesis              1674         CBlockIndex* pindex = vStack.back().second;
genesis              1675         vStack.pop_back();
genesis              1676 
genesis              1677         // print split or gap
genesis              1678         if (nCol > nPrevCol)
genesis              1679         {
genesis              1680             for (int i = 0; i < nCol-1; i++)
genesis              1681                 printf("| ");
genesis              1682             printf("|\\\n");
genesis              1683         }
genesis              1684         else if (nCol < nPrevCol)
genesis              1685         {
genesis              1686             for (int i = 0; i < nCol; i++)
genesis              1687                 printf("| ");
genesis              1688             printf("|\n");
genesis              1689        }
genesis              1690         nPrevCol = nCol;
genesis              1691 
genesis              1692         // print columns
genesis              1693         for (int i = 0; i < nCol; i++)
genesis              1694             printf("| ");
genesis              1695 
genesis              1696         // print item
genesis              1697         CBlock block;
genesis              1698         block.ReadFromDisk(pindex);
genesis              1699         printf("%d (%u,%u) %s  %s  tx %d",
genesis              1700             pindex->nHeight,
genesis              1701             pindex->nFile,
genesis              1702             pindex->nBlockPos,
genesis              1703             block.GetHash().ToString().substr(0,20).c_str(),
genesis              1704             DateTimeStrFormat("%x %H:%M:%S", block.GetBlockTime()).c_str(),
genesis              1705             block.vtx.size());
genesis              1706 
genesis              1707         PrintWallets(block);
genesis              1708 
genesis              1709         // put the main timechain first
genesis              1710         vector<CBlockIndex*>& vNext = mapNext[pindex];
genesis              1711         for (int i = 0; i < vNext.size(); i++)
genesis              1712         {
genesis              1713             if (vNext[i]->pnext)
genesis              1714             {
genesis              1715                 swap(vNext[0], vNext[i]);
genesis              1716                 break;
genesis              1717             }
genesis              1718         }
genesis              1719 
genesis              1720         // iterate children
genesis              1721         for (int i = 0; i < vNext.size(); i++)
genesis              1722             vStack.push_back(make_pair(nCol+i, vNext[i]));
genesis              1723     }
genesis              1724 }
genesis              1725 
genesis              1726 
genesis              1727 
genesis              1728 
genesis              1729 
genesis              1730 
genesis              1731 
genesis              1732 
genesis              1733 
genesis              1734 
genesis              1735 //////////////////////////////////////////////////////////////////////////////
genesis              1736 //
genesis              1737 // CAlert
genesis              1738 //
genesis              1739 
genesis              1740 map<uint256, CAlert> mapAlerts;
genesis              1741 CCriticalSection cs_mapAlerts;
genesis              1742 
genesis              1743 string GetWarnings(string strFor)
genesis              1744 {
genesis              1745     int nPriority = 0;
genesis              1746     string strStatusBar;
genesis              1747     string strRPC;
genesis              1748     if (GetBoolArg("-testsafemode"))
genesis              1749         strRPC = "test";
genesis              1750 
genesis              1751     // Misc warnings like out of disk space and clock is wrong
genesis              1752     if (strMiscWarning != "")
genesis              1753     {
genesis              1754         nPriority = 1000;
genesis              1755         strStatusBar = strMiscWarning;
genesis              1756     }
genesis              1757 
genesis              1758     // Longer invalid proof-of-work chain
genesis              1759     if (pindexBest && bnBestInvalidWork > bnBestChainWork + pindexBest->GetBlockWork() * 6)
genesis              1760     {
genesis              1761         nPriority = 2000;
genesis              1762         strStatusBar = strRPC = "WARNING: Displayed transactions may not be correct!  You may need to upgrade, or other nodes may need to upgrade.";
genesis              1763     }
genesis              1764 
genesis              1765     // Alerts
genesis              1766     CRITICAL_BLOCK(cs_mapAlerts)
genesis              1767     {
genesis              1768         BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
genesis              1769         {
genesis              1770             const CAlert& alert = item.second;
genesis              1771             if (alert.AppliesToMe() && alert.nPriority > nPriority)
genesis              1772             {
genesis              1773                 nPriority = alert.nPriority;
genesis              1774                 strStatusBar = alert.strStatusBar;
genesis              1775             }
genesis              1776         }
genesis              1777     }
genesis              1778 
genesis              1779     if (strFor == "statusbar")
genesis              1780         return strStatusBar;
genesis              1781     else if (strFor == "rpc")
genesis              1782         return strRPC;
genesis              1783     assert(!"GetWarnings() : invalid parameter");
genesis              1784     return "error";
genesis              1785 }
genesis              1786 
genesis              1787 bool CAlert::ProcessAlert()
genesis              1788 {
genesis              1789     if (!CheckSignature())
genesis              1790         return false;
genesis              1791     if (!IsInEffect())
genesis              1792         return false;
genesis              1793 
genesis              1794     CRITICAL_BLOCK(cs_mapAlerts)
genesis              1795     {
genesis              1796         // Cancel previous alerts
genesis              1797         for (map<uint256, CAlert>::iterator mi = mapAlerts.begin(); mi != mapAlerts.end();)
genesis              1798         {
genesis              1799             const CAlert& alert = (*mi).second;
genesis              1800             if (Cancels(alert))
genesis              1801             {
genesis              1802                 printf("cancelling alert %d\n", alert.nID);
genesis              1803                 mapAlerts.erase(mi++);
genesis              1804             }
genesis              1805             else if (!alert.IsInEffect())
genesis              1806             {
genesis              1807                 printf("expiring alert %d\n", alert.nID);
genesis              1808                 mapAlerts.erase(mi++);
genesis              1809             }
genesis              1810             else
genesis              1811                 mi++;
genesis              1812         }
genesis              1813 
genesis              1814         // Check if this alert has been cancelled
genesis              1815         BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
genesis              1816         {
genesis              1817             const CAlert& alert = item.second;
genesis              1818             if (alert.Cancels(*this))
genesis              1819             {
genesis              1820                 printf("alert already cancelled by %d\n", alert.nID);
genesis              1821                 return false;
genesis              1822             }
genesis              1823         }
genesis              1824 
genesis              1825         // Add to mapAlerts
genesis              1826         mapAlerts.insert(make_pair(GetHash(), *this));
genesis              1827     }
genesis              1828 
genesis              1829     printf("accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe());
genesis              1830     MainFrameRepaint();
genesis              1831     return true;
genesis              1832 }
genesis              1833 
genesis              1834 
genesis              1835 
genesis              1836 
genesis              1837 
genesis              1838 
genesis              1839 
genesis              1840 
genesis              1841 //////////////////////////////////////////////////////////////////////////////
genesis              1842 //
genesis              1843 // Messages
genesis              1844 //
genesis              1845 
genesis              1846 
genesis              1847 bool static AlreadyHave(CTxDB& txdb, const CInv& inv)
genesis              1848 {
genesis              1849     switch (inv.type)
genesis              1850     {
genesis              1851     case MSG_TX:    return mapTransactions.count(inv.hash) || mapOrphanTransactions.count(inv.hash) || txdb.ContainsTx(inv.hash);
genesis              1852     case MSG_BLOCK: return mapBlockIndex.count(inv.hash) || mapOrphanBlocks.count(inv.hash);
genesis              1853     }
genesis              1854     // Don't know what it is, just say we already got one
genesis              1855     return true;
genesis              1856 }
genesis              1857 
genesis              1858 
genesis              1859 
genesis              1860 
genesis              1861 // The message start string is designed to be unlikely to occur in normal data.
genesis              1862 // The characters are rarely used upper ascii, not valid as UTF-8, and produce
genesis              1863 // a large 4-byte int at any alignment.
genesis              1864 unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
genesis              1865 
genesis              1866 
genesis              1867 bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
genesis              1868 {
genesis              1869     static map<unsigned int, vector<unsigned char> > mapReuseKey;
genesis              1870     RandAddSeedPerfmon();
genesis              1871     if (fDebug) {
genesis              1872         printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
genesis              1873         printf("received: %s (%d bytes)\n", strCommand.c_str(), vRecv.size());
genesis              1874     }
genesis              1875     if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
genesis              1876     {
genesis              1877         printf("dropmessagestest DROPPING RECV MESSAGE\n");
genesis              1878         return true;
genesis              1879     }
genesis              1880 
genesis              1881 
genesis              1882 
genesis              1883 
genesis              1884 
genesis              1885     if (strCommand == "version")
genesis              1886     {
genesis              1887         // Each connection can only send one version message
genesis              1888         if (pfrom->nVersion != 0)
genesis              1889         {
genesis              1890             pfrom->Misbehaving(1);
genesis              1891             return false;
genesis              1892         }
genesis              1893 
genesis              1894         int64 nTime;
genesis              1895         CAddress addrMe;
genesis              1896         CAddress addrFrom;
genesis              1897         uint64 nNonce = 1;
genesis              1898         vRecv >> pfrom->nVersion >> pfrom->nServices >> nTime >> addrMe;
genesis              1899         if (pfrom->nVersion == 10300)
genesis              1900             pfrom->nVersion = 300;
genesis              1901         if (pfrom->nVersion >= 106 && !vRecv.empty())
genesis              1902             vRecv >> addrFrom >> nNonce;
genesis              1903         if (pfrom->nVersion >= 106 && !vRecv.empty())
genesis              1904             vRecv >> pfrom->strSubVer;
genesis              1905         if (pfrom->nVersion >= 209 && !vRecv.empty())
genesis              1906             vRecv >> pfrom->nStartingHeight;
genesis              1907 
genesis              1908         if (pfrom->nVersion == 0)
genesis              1909             return false;
genesis              1910 
genesis              1911         // Disconnect if we connected to ourself
genesis              1912         if (nNonce == nLocalHostNonce && nNonce > 1)
genesis              1913         {
genesis              1914             printf("connected to self at %s, disconnecting\n", pfrom->addr.ToString().c_str());
genesis              1915             pfrom->fDisconnect = true;
genesis              1916             return true;
genesis              1917         }
genesis              1918 
genesis              1919         // Be shy and don't send version until we hear
genesis              1920         if (pfrom->fInbound)
genesis              1921             pfrom->PushVersion();
genesis              1922 
genesis              1923         pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
genesis              1924 
genesis              1925         AddTimeData(pfrom->addr.ip, nTime);
genesis              1926 
genesis              1927         // Change version
genesis              1928         if (pfrom->nVersion >= 209)
genesis              1929             pfrom->PushMessage("verack");
genesis              1930         pfrom->vSend.SetVersion(min(pfrom->nVersion, VERSION));
genesis              1931         if (pfrom->nVersion < 209)
genesis              1932             pfrom->vRecv.SetVersion(min(pfrom->nVersion, VERSION));
genesis              1933 
genesis              1934         if (!pfrom->fInbound)
genesis              1935         {
genesis              1936             // Advertise our address
genesis              1937             if (addrLocalHost.IsRoutable() && !fUseProxy)
genesis              1938             {
genesis              1939                 CAddress addr(addrLocalHost);
genesis              1940                 addr.nTime = GetAdjustedTime();
genesis              1941                 pfrom->PushAddress(addr);
genesis              1942             }
genesis              1943 
genesis              1944             // Get recent addresses
genesis              1945             if (pfrom->nVersion >= 31402 || mapAddresses.size() < 1000)
genesis              1946             {
genesis              1947                 pfrom->PushMessage("getaddr");
genesis              1948                 pfrom->fGetAddr = true;
genesis              1949             }
genesis              1950         }
genesis              1951 
genesis              1952         // Ask the first connected node for block updates
genesis              1953         static int nAskedForBlocks;
genesis              1954         if (!pfrom->fClient &&
genesis              1955             (pfrom->nVersion < 32000 || pfrom->nVersion >= 32400) &&
genesis              1956              (nAskedForBlocks < 1 || vNodes.size() <= 1))
genesis              1957         {
genesis              1958             nAskedForBlocks++;
genesis              1959             pfrom->PushGetBlocks(pindexBest, uint256(0));
genesis              1960         }
genesis              1961 
genesis              1962         // Relay alerts
genesis              1963         CRITICAL_BLOCK(cs_mapAlerts)
genesis              1964             BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
genesis              1965                 item.second.RelayTo(pfrom);
genesis              1966 
genesis              1967         pfrom->fSuccessfullyConnected = true;
genesis              1968 
genesis              1969         printf("version message: version %d, blocks=%d\n", pfrom->nVersion, pfrom->nStartingHeight);
genesis              1970 
genesis              1971         cPeerBlockCounts.input(pfrom->nStartingHeight);
genesis              1972     }
genesis              1973 
genesis              1974 
genesis              1975     else if (pfrom->nVersion == 0)
genesis              1976     {
genesis              1977         // Must have a version message before anything else
genesis              1978         pfrom->Misbehaving(1);
genesis              1979         return false;
genesis              1980     }
genesis              1981 
genesis              1982 
genesis              1983     else if (strCommand == "verack")
genesis              1984     {
genesis              1985         pfrom->vRecv.SetVersion(min(pfrom->nVersion, VERSION));
genesis              1986     }
genesis              1987 
genesis              1988 
genesis              1989     else if (strCommand == "addr")
genesis              1990     {
genesis              1991         vector<CAddress> vAddr;
genesis              1992         vRecv >> vAddr;
genesis              1993 
genesis              1994         // Don't want addr from older versions unless seeding
genesis              1995         if (pfrom->nVersion < 209)
genesis              1996             return true;
genesis              1997         if (pfrom->nVersion < 31402 && mapAddresses.size() > 1000)
genesis              1998             return true;
genesis              1999         if (vAddr.size() > 1000)
genesis              2000         {
genesis              2001             pfrom->Misbehaving(20);
genesis              2002             return error("message addr size() = %d", vAddr.size());
genesis              2003         }
genesis              2004 
genesis              2005         // Store the new addresses
genesis              2006         CAddrDB addrDB;
genesis              2007         addrDB.TxnBegin();
genesis              2008         int64 nNow = GetAdjustedTime();
genesis              2009         int64 nSince = nNow - 10 * 60;
genesis              2010         BOOST_FOREACH(CAddress& addr, vAddr)
genesis              2011         {
genesis              2012             if (fShutdown)
genesis              2013                 return true;
genesis              2014             // ignore IPv6 for now, since it isn't implemented anyway
genesis              2015             if (!addr.IsIPv4())
genesis              2016                 continue;
genesis              2017             if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
genesis              2018                 addr.nTime = nNow - 5 * 24 * 60 * 60;
genesis              2019             AddAddress(addr, 2 * 60 * 60, &addrDB);
genesis              2020             pfrom->AddAddressKnown(addr);
genesis              2021             if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
genesis              2022             {
genesis              2023                 // Relay to a limited number of other nodes
genesis              2024                 CRITICAL_BLOCK(cs_vNodes)
genesis              2025                 {
genesis              2026                     // Use deterministic randomness to send to the same nodes for 24 hours
genesis              2027                     // at a time so the setAddrKnowns of the chosen nodes prevent repeats
genesis              2028                     static uint256 hashSalt;
genesis              2029                     if (hashSalt == 0)
genesis              2030                         RAND_bytes((unsigned char*)&hashSalt, sizeof(hashSalt));
genesis              2031                     uint256 hashRand = hashSalt ^ (((int64)addr.ip)<<32) ^ ((GetTime()+addr.ip)/(24*60*60));
genesis              2032                     hashRand = Hash(BEGIN(hashRand), END(hashRand));
genesis              2033                     multimap<uint256, CNode*> mapMix;
genesis              2034                     BOOST_FOREACH(CNode* pnode, vNodes)
genesis              2035                     {
genesis              2036                         if (pnode->nVersion < 31402)
genesis              2037                             continue;
genesis              2038                         unsigned int nPointer;
genesis              2039                         memcpy(&nPointer, &pnode, sizeof(nPointer));
genesis              2040                         uint256 hashKey = hashRand ^ nPointer;
genesis              2041                         hashKey = Hash(BEGIN(hashKey), END(hashKey));
genesis              2042                         mapMix.insert(make_pair(hashKey, pnode));
genesis              2043                     }
genesis              2044                     int nRelayNodes = 2;
genesis              2045                     for (multimap<uint256, CNode*>::iterator mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
genesis              2046                         ((*mi).second)->PushAddress(addr);
genesis              2047                 }
genesis              2048             }
genesis              2049         }
genesis              2050         addrDB.TxnCommit();  // Save addresses (it's ok if this fails)
genesis              2051         if (vAddr.size() < 1000)
genesis              2052             pfrom->fGetAddr = false;
genesis              2053     }
genesis              2054 
genesis              2055 
genesis              2056     else if (strCommand == "inv")
genesis              2057     {
genesis              2058         vector<CInv> vInv;
genesis              2059         vRecv >> vInv;
genesis              2060         if (vInv.size() > 50000)
genesis              2061         {
genesis              2062             pfrom->Misbehaving(20);
genesis              2063             return error("message inv size() = %d", vInv.size());
genesis              2064         }
genesis              2065 
genesis              2066         CTxDB txdb("r");
genesis              2067         BOOST_FOREACH(const CInv& inv, vInv)
genesis              2068         {
genesis              2069             if (fShutdown)
genesis              2070                 return true;
genesis              2071             pfrom->AddInventoryKnown(inv);
genesis              2072 
genesis              2073             bool fAlreadyHave = AlreadyHave(txdb, inv);
genesis              2074             if (fDebug)
genesis              2075                 printf("  got inventory: %s  %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new");
genesis              2076 
genesis              2077             if (!fAlreadyHave)
genesis              2078                 pfrom->AskFor(inv);
genesis              2079             else if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash))
genesis              2080                 pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(mapOrphanBlocks[inv.hash]));
genesis              2081 
genesis              2082             // Track requests for our stuff
genesis              2083             Inventory(inv.hash);
genesis              2084         }
genesis              2085     }
genesis              2086 
genesis              2087 
genesis              2088     else if (strCommand == "getdata")
genesis              2089     {
genesis              2090         vector<CInv> vInv;
genesis              2091         vRecv >> vInv;
genesis              2092         if (vInv.size() > 50000)
genesis              2093         {
genesis              2094             pfrom->Misbehaving(20);
genesis              2095             return error("message getdata size() = %d", vInv.size());
genesis              2096         }
genesis              2097 
genesis              2098         BOOST_FOREACH(const CInv& inv, vInv)
genesis              2099         {
genesis              2100             if (fShutdown)
genesis              2101                 return true;
genesis              2102             printf("received getdata for: %s\n", inv.ToString().c_str());
genesis              2103 
genesis              2104             if (inv.type == MSG_BLOCK)
genesis              2105             {
genesis              2106                 // Send block from disk
genesis              2107                 map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(inv.hash);
genesis              2108                 if (mi != mapBlockIndex.end())
genesis              2109                 {
genesis              2110                     CBlock block;
genesis              2111                     block.ReadFromDisk((*mi).second);
genesis              2112                     pfrom->PushMessage("block", block);
genesis              2113 
genesis              2114                     // Trigger them to send a getblocks request for the next batch of inventory
genesis              2115                     if (inv.hash == pfrom->hashContinue)
genesis              2116                     {
genesis              2117                         // Bypass PushInventory, this must send even if redundant,
genesis              2118                         // and we want it right after the last block so they don't
genesis              2119                         // wait for other stuff first.
genesis              2120                         vector<CInv> vInv;
genesis              2121                         vInv.push_back(CInv(MSG_BLOCK, hashBestChain));
genesis              2122                         pfrom->PushMessage("inv", vInv);
genesis              2123                         pfrom->hashContinue = 0;
genesis              2124                     }
genesis              2125                 }
genesis              2126             }
genesis              2127             else if (inv.IsKnownType())
genesis              2128             {
genesis              2129                 // Send stream from relay memory
genesis              2130                 CRITICAL_BLOCK(cs_mapRelay)
genesis              2131                 {
genesis              2132                     map<CInv, CDataStream>::iterator mi = mapRelay.find(inv);
genesis              2133                     if (mi != mapRelay.end())
genesis              2134                         pfrom->PushMessage(inv.GetCommand(), (*mi).second);
genesis              2135                 }
genesis              2136             }
genesis              2137 
genesis              2138             // Track requests for our stuff
genesis              2139             Inventory(inv.hash);
genesis              2140         }
genesis              2141     }
genesis              2142 
genesis              2143 
genesis              2144     else if (strCommand == "getblocks")
genesis              2145     {
genesis              2146         CBlockLocator locator;
genesis              2147         uint256 hashStop;
genesis              2148         vRecv >> locator >> hashStop;
genesis              2149 
genesis              2150         // Find the last block the caller has in the main chain
genesis              2151         CBlockIndex* pindex = locator.GetBlockIndex();
genesis              2152 
genesis              2153         // Send the rest of the chain
genesis              2154         if (pindex)
genesis              2155             pindex = pindex->pnext;
genesis              2156         int nLimit = 500 + locator.GetDistanceBack();
genesis              2157         unsigned int nBytes = 0;
genesis              2158         printf("getblocks %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
genesis              2159         for (; pindex; pindex = pindex->pnext)
genesis              2160         {
genesis              2161             if (pindex->GetBlockHash() == hashStop)
genesis              2162             {
genesis              2163                 printf("  getblocks stopping at %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
genesis              2164                 break;
genesis              2165             }
genesis              2166             pfrom->PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash()));
genesis              2167             CBlock block;
genesis              2168             block.ReadFromDisk(pindex, true);
genesis              2169             nBytes += block.GetSerializeSize(SER_NETWORK);
genesis              2170             if (--nLimit <= 0 || nBytes >= SendBufferSize()/2)
genesis              2171             {
genesis              2172                 // When this block is requested, we'll send an inv that'll make them
genesis              2173                 // getblocks the next batch of inventory.
genesis              2174                 printf("  getblocks stopping at limit %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
genesis              2175                 pfrom->hashContinue = pindex->GetBlockHash();
genesis              2176                 break;
genesis              2177             }
genesis              2178         }
genesis              2179     }
genesis              2180 
genesis              2181 
genesis              2182     else if (strCommand == "getheaders")
genesis              2183     {
genesis              2184         CBlockLocator locator;
genesis              2185         uint256 hashStop;
genesis              2186         vRecv >> locator >> hashStop;
genesis              2187 
genesis              2188         CBlockIndex* pindex = NULL;
genesis              2189         if (locator.IsNull())
genesis              2190         {
genesis              2191             // If locator is null, return the hashStop block
genesis              2192             map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashStop);
genesis              2193             if (mi == mapBlockIndex.end())
genesis              2194                 return true;
genesis              2195             pindex = (*mi).second;
genesis              2196         }
genesis              2197         else
genesis              2198         {
genesis              2199             // Find the last block the caller has in the main chain
genesis              2200             pindex = locator.GetBlockIndex();
genesis              2201             if (pindex)
genesis              2202                 pindex = pindex->pnext;
genesis              2203         }
genesis              2204 
genesis              2205         vector<CBlock> vHeaders;
genesis              2206         int nLimit = 2000 + locator.GetDistanceBack();
genesis              2207         printf("getheaders %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
genesis              2208         for (; pindex; pindex = pindex->pnext)
genesis              2209         {
genesis              2210             vHeaders.push_back(pindex->GetBlockHeader());
genesis              2211             if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
genesis              2212                 break;
genesis              2213         }
genesis              2214         pfrom->PushMessage("headers", vHeaders);
genesis              2215     }
genesis              2216 
genesis              2217 
genesis              2218     else if (strCommand == "tx")
genesis              2219     {
genesis              2220         vector<uint256> vWorkQueue;
genesis              2221         CDataStream vMsg(vRecv);
genesis              2222         CTransaction tx;
genesis              2223         vRecv >> tx;
genesis              2224 
genesis              2225         CInv inv(MSG_TX, tx.GetHash());
genesis              2226         pfrom->AddInventoryKnown(inv);
genesis              2227 
genesis              2228         bool fMissingInputs = false;
genesis              2229         if (tx.AcceptToMemoryPool(true, &fMissingInputs))
genesis              2230         {
genesis              2231             SyncWithWallets(tx, NULL, true);
genesis              2232             RelayMessage(inv, vMsg);
genesis              2233             mapAlreadyAskedFor.erase(inv);
genesis              2234             vWorkQueue.push_back(inv.hash);
genesis              2235 
genesis              2236             // Recursively process any orphan transactions that depended on this one
genesis              2237             for (int i = 0; i < vWorkQueue.size(); i++)
genesis              2238             {
genesis              2239                 uint256 hashPrev = vWorkQueue[i];
genesis              2240                 for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(hashPrev);
genesis              2241                      mi != mapOrphanTransactionsByPrev.upper_bound(hashPrev);
genesis              2242                      ++mi)
genesis              2243                 {
genesis              2244                     const CDataStream& vMsg = *((*mi).second);
genesis              2245                     CTransaction tx;
genesis              2246                     CDataStream(vMsg) >> tx;
genesis              2247                     CInv inv(MSG_TX, tx.GetHash());
genesis              2248 
genesis              2249                     if (tx.AcceptToMemoryPool(true))
genesis              2250                     {
genesis              2251                         printf("   accepted orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
genesis              2252                         SyncWithWallets(tx, NULL, true);
genesis              2253                         RelayMessage(inv, vMsg);
genesis              2254                         mapAlreadyAskedFor.erase(inv);
genesis              2255                         vWorkQueue.push_back(inv.hash);
genesis              2256                     }
genesis              2257                 }
genesis              2258             }
genesis              2259 
genesis              2260             BOOST_FOREACH(uint256 hash, vWorkQueue)
genesis              2261                 EraseOrphanTx(hash);
genesis              2262         }
genesis              2263         else if (fMissingInputs)
genesis              2264         {
genesis              2265             printf("storing orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
genesis              2266             AddOrphanTx(vMsg);
genesis              2267 
genesis              2268             // DoS prevention: do not allow mapOrphanTransactions to grow unbounded
genesis              2269             int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
genesis              2270             if (nEvicted > 0)
genesis              2271                 printf("mapOrphan overflow, removed %d tx\n", nEvicted);
genesis              2272         }
genesis              2273         if (tx.nDoS) pfrom->Misbehaving(tx.nDoS);
genesis              2274     }
genesis              2275 
genesis              2276 
genesis              2277     else if (strCommand == "block")
genesis              2278     {
genesis              2279         CBlock block;
genesis              2280         vRecv >> block;
genesis              2281 
genesis              2282         printf("received block %s\n", block.GetHash().ToString().substr(0,20).c_str());
genesis              2283         // block.print();
genesis              2284 
genesis              2285         CInv inv(MSG_BLOCK, block.GetHash());
genesis              2286         pfrom->AddInventoryKnown(inv);
genesis              2287 
genesis              2288         if (ProcessBlock(pfrom, &block))
genesis              2289             mapAlreadyAskedFor.erase(inv);
genesis              2290         if (block.nDoS) pfrom->Misbehaving(block.nDoS);
genesis              2291     }
genesis              2292 
genesis              2293 
genesis              2294     else if (strCommand == "getaddr")
genesis              2295     {
genesis              2296         // Nodes rebroadcast an addr every 24 hours
genesis              2297         pfrom->vAddrToSend.clear();
genesis              2298         int64 nSince = GetAdjustedTime() - 3 * 60 * 60; // in the last 3 hours
genesis              2299         CRITICAL_BLOCK(cs_mapAddresses)
genesis              2300         {
genesis              2301             unsigned int nCount = 0;
genesis              2302             BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
genesis              2303             {
genesis              2304                 const CAddress& addr = item.second;
genesis              2305                 if (addr.nTime > nSince)
genesis              2306                     nCount++;
genesis              2307             }
genesis              2308             BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
genesis              2309             {
genesis              2310                 const CAddress& addr = item.second;
genesis              2311                 if (addr.nTime > nSince && GetRand(nCount) < 2500)
genesis              2312                     pfrom->PushAddress(addr);
genesis              2313             }
genesis              2314         }
genesis              2315     }
genesis              2316 
genesis              2317 
genesis              2318     else if (strCommand == "checkorder")
genesis              2319     {
genesis              2320         uint256 hashReply;
genesis              2321         vRecv >> hashReply;
genesis              2322 
genesis              2323         if (!GetBoolArg("-allowreceivebyip"))
genesis              2324         {
genesis              2325             pfrom->PushMessage("reply", hashReply, (int)2, string(""));
genesis              2326             return true;
genesis              2327         }
genesis              2328 
genesis              2329         CWalletTx order;
genesis              2330         vRecv >> order;
genesis              2331 
genesis              2332         /// we have a chance to check the order here
genesis              2333 
genesis              2334         // Keep giving the same key to the same ip until they use it
genesis              2335         if (!mapReuseKey.count(pfrom->addr.ip))
genesis              2336             pwalletMain->GetKeyFromPool(mapReuseKey[pfrom->addr.ip], true);
genesis              2337 
genesis              2338         // Send back approval of order and pubkey to use
genesis              2339         CScript scriptPubKey;
genesis              2340         scriptPubKey << mapReuseKey[pfrom->addr.ip] << OP_CHECKSIG;
genesis              2341         pfrom->PushMessage("reply", hashReply, (int)0, scriptPubKey);
genesis              2342     }
genesis              2343 
genesis              2344 
genesis              2345     else if (strCommand == "reply")
genesis              2346     {
genesis              2347         uint256 hashReply;
genesis              2348         vRecv >> hashReply;
genesis              2349 
genesis              2350         CRequestTracker tracker;
genesis              2351         CRITICAL_BLOCK(pfrom->cs_mapRequests)
genesis              2352         {
genesis              2353             map<uint256, CRequestTracker>::iterator mi = pfrom->mapRequests.find(hashReply);
genesis              2354             if (mi != pfrom->mapRequests.end())
genesis              2355             {
genesis              2356                 tracker = (*mi).second;
genesis              2357                 pfrom->mapRequests.erase(mi);
genesis              2358             }
genesis              2359         }
genesis              2360         if (!tracker.IsNull())
genesis              2361             tracker.fn(tracker.param1, vRecv);
genesis              2362     }
genesis              2363 
genesis              2364 
genesis              2365     else if (strCommand == "ping")
genesis              2366     {
genesis              2367     }
genesis              2368 
genesis              2369 
genesis              2370     else if (strCommand == "alert")
genesis              2371     {
genesis              2372         CAlert alert;
genesis              2373         vRecv >> alert;
genesis              2374 
genesis              2375         if (alert.ProcessAlert())
genesis              2376         {
genesis              2377             // Relay
genesis              2378             pfrom->setKnown.insert(alert.GetHash());
genesis              2379             CRITICAL_BLOCK(cs_vNodes)
genesis              2380                 BOOST_FOREACH(CNode* pnode, vNodes)
genesis              2381                     alert.RelayTo(pnode);
genesis              2382         }
genesis              2383     }
genesis              2384 
genesis              2385 
genesis              2386     else
genesis              2387     {
genesis              2388         // Ignore unknown commands for extensibility
genesis              2389     }
genesis              2390 
genesis              2391 
genesis              2392     // Update the last seen time for this node's address
genesis              2393     if (pfrom->fNetworkNode)
genesis              2394         if (strCommand == "version" || strCommand == "addr" || strCommand == "inv" || strCommand == "getdata" || strCommand == "ping")
genesis              2395             AddressCurrentlyConnected(pfrom->addr);
genesis              2396 
genesis              2397 
genesis              2398     return true;
genesis              2399 }
genesis              2400 
genesis              2401 bool ProcessMessages(CNode* pfrom)
genesis              2402 {
genesis              2403     CDataStream& vRecv = pfrom->vRecv;
genesis              2404     if (vRecv.empty())
genesis              2405         return true;
genesis              2406     //if (fDebug)
genesis              2407     //    printf("ProcessMessages(%u bytes)\n", vRecv.size());
genesis              2408 
genesis              2409     //
genesis              2410     // Message format
genesis              2411     //  (4) message start
genesis              2412     //  (12) command
genesis              2413     //  (4) size
genesis              2414     //  (4) checksum
genesis              2415     //  (x) data
genesis              2416     //
genesis              2417 
genesis              2418     loop
genesis              2419     {
genesis              2420         // Scan for message start
genesis              2421         CDataStream::iterator pstart = search(vRecv.begin(), vRecv.end(), BEGIN(pchMessageStart), END(pchMessageStart));
genesis              2422         int nHeaderSize = vRecv.GetSerializeSize(CMessageHeader());
genesis              2423         if (vRecv.end() - pstart < nHeaderSize)
genesis              2424         {
genesis              2425             if (vRecv.size() > nHeaderSize)
genesis              2426             {
genesis              2427                 printf("\n\nPROCESSMESSAGE MESSAGESTART NOT FOUND\n\n");
genesis              2428                 vRecv.erase(vRecv.begin(), vRecv.end() - nHeaderSize);
genesis              2429             }
genesis              2430             break;
genesis              2431         }
genesis              2432         if (pstart - vRecv.begin() > 0)
genesis              2433             printf("\n\nPROCESSMESSAGE SKIPPED %d BYTES\n\n", pstart - vRecv.begin());
genesis              2434         vRecv.erase(vRecv.begin(), pstart);
genesis              2435 
genesis              2436         // Read header
genesis              2437         vector<char> vHeaderSave(vRecv.begin(), vRecv.begin() + nHeaderSize);
genesis              2438         CMessageHeader hdr;
genesis              2439         vRecv >> hdr;
genesis              2440         if (!hdr.IsValid())
genesis              2441         {
genesis              2442             printf("\n\nPROCESSMESSAGE: ERRORS IN HEADER %s\n\n\n", hdr.GetCommand().c_str());
genesis              2443             continue;
genesis              2444         }
genesis              2445         string strCommand = hdr.GetCommand();
genesis              2446 
genesis              2447         // Message size
genesis              2448         unsigned int nMessageSize = hdr.nMessageSize;
genesis              2449         if (nMessageSize > MAX_SIZE)
genesis              2450         {
genesis              2451             printf("ProcessMessage(%s, %u bytes) : nMessageSize > MAX_SIZE\n", strCommand.c_str(), nMessageSize);
genesis              2452             continue;
genesis              2453         }
genesis              2454         if (nMessageSize > vRecv.size())
genesis              2455         {
genesis              2456             // Rewind and wait for rest of message
genesis              2457             vRecv.insert(vRecv.begin(), vHeaderSave.begin(), vHeaderSave.end());
genesis              2458             break;
genesis              2459         }
genesis              2460 
genesis              2461         // Checksum
genesis              2462         if (vRecv.GetVersion() >= 209)
genesis              2463         {
genesis              2464             uint256 hash = Hash(vRecv.begin(), vRecv.begin() + nMessageSize);
genesis              2465             unsigned int nChecksum = 0;
genesis              2466             memcpy(&nChecksum, &hash, sizeof(nChecksum));
genesis              2467             if (nChecksum != hdr.nChecksum)
genesis              2468             {
genesis              2469                 printf("ProcessMessage(%s, %u bytes) : CHECKSUM ERROR nChecksum=%08x hdr.nChecksum=%08x\n",
genesis              2470                        strCommand.c_str(), nMessageSize, nChecksum, hdr.nChecksum);
genesis              2471                 continue;
genesis              2472             }
genesis              2473         }
genesis              2474 
genesis              2475         // Copy message to its own buffer
genesis              2476         CDataStream vMsg(vRecv.begin(), vRecv.begin() + nMessageSize, vRecv.nType, vRecv.nVersion);
genesis              2477         vRecv.ignore(nMessageSize);
genesis              2478 
genesis              2479         // Process message
genesis              2480         bool fRet = false;
genesis              2481         try
genesis              2482         {
genesis              2483             CRITICAL_BLOCK(cs_main)
genesis              2484                 fRet = ProcessMessage(pfrom, strCommand, vMsg);
genesis              2485             if (fShutdown)
genesis              2486                 return true;
genesis              2487         }
genesis              2488         catch (std::ios_base::failure& e)
genesis              2489         {
genesis              2490             if (strstr(e.what(), "end of data"))
genesis              2491             {
genesis              2492                 // Allow exceptions from underlength message on vRecv
genesis              2493                 printf("ProcessMessage(%s, %u bytes) : Exception '%s' caught, normally caused by a message being shorter than its stated length\n", strCommand.c_str(), nMessageSize, e.what());
genesis              2494             }
genesis              2495             else if (strstr(e.what(), "size too large"))
genesis              2496             {
genesis              2497                 // Allow exceptions from overlong size
genesis              2498                 printf("ProcessMessage(%s, %u bytes) : Exception '%s' caught\n", strCommand.c_str(), nMessageSize, e.what());
genesis              2499             }
genesis              2500             else
genesis              2501             {
genesis              2502                 PrintExceptionContinue(&e, "ProcessMessage()");
genesis              2503             }
genesis              2504         }
genesis              2505         catch (std::exception& e) {
genesis              2506             PrintExceptionContinue(&e, "ProcessMessage()");
genesis              2507         } catch (...) {
genesis              2508             PrintExceptionContinue(NULL, "ProcessMessage()");
genesis              2509         }
genesis              2510 
genesis              2511         if (!fRet)
genesis              2512             printf("ProcessMessage(%s, %u bytes) FAILED\n", strCommand.c_str(), nMessageSize);
genesis              2513     }
genesis              2514 
genesis              2515     vRecv.Compact();
genesis              2516     return true;
genesis              2517 }
genesis              2518 
genesis              2519 
genesis              2520 bool SendMessages(CNode* pto, bool fSendTrickle)
genesis              2521 {
genesis              2522     CRITICAL_BLOCK(cs_main)
genesis              2523     {
genesis              2524         // Don't send anything until we get their version message
genesis              2525         if (pto->nVersion == 0)
genesis              2526             return true;
genesis              2527 
genesis              2528         // Keep-alive ping
genesis              2529         if (pto->nLastSend && GetTime() - pto->nLastSend > 30 * 60 && pto->vSend.empty())
genesis              2530             pto->PushMessage("ping");
genesis              2531 
genesis              2532         // Resend wallet transactions that haven't gotten in a block yet
genesis              2533         ResendWalletTransactions();
genesis              2534 
genesis              2535         // Address refresh broadcast
genesis              2536         static int64 nLastRebroadcast;
genesis              2537         if (GetTime() - nLastRebroadcast > 24 * 60 * 60)
genesis              2538         {
genesis              2539             nLastRebroadcast = GetTime();
genesis              2540             CRITICAL_BLOCK(cs_vNodes)
genesis              2541             {
genesis              2542                 BOOST_FOREACH(CNode* pnode, vNodes)
genesis              2543                 {
genesis              2544                     // Periodically clear setAddrKnown to allow refresh broadcasts
genesis              2545                     pnode->setAddrKnown.clear();
genesis              2546 
genesis              2547                     // Rebroadcast our address
genesis              2548                     if (addrLocalHost.IsRoutable() && !fUseProxy)
genesis              2549                     {
genesis              2550                         CAddress addr(addrLocalHost);
genesis              2551                         addr.nTime = GetAdjustedTime();
genesis              2552                         pnode->PushAddress(addr);
genesis              2553                     }
genesis              2554                 }
genesis              2555             }
genesis              2556         }
genesis              2557 
genesis              2558         // Clear out old addresses periodically so it's not too much work at once
genesis              2559         static int64 nLastClear;
genesis              2560         if (nLastClear == 0)
genesis              2561             nLastClear = GetTime();
genesis              2562         if (GetTime() - nLastClear > 10 * 60 && vNodes.size() >= 3)
genesis              2563         {
genesis              2564             nLastClear = GetTime();
genesis              2565             CRITICAL_BLOCK(cs_mapAddresses)
genesis              2566             {
genesis              2567                 CAddrDB addrdb;
genesis              2568                 int64 nSince = GetAdjustedTime() - 14 * 24 * 60 * 60;
genesis              2569                 for (map<vector<unsigned char>, CAddress>::iterator mi = mapAddresses.begin();
genesis              2570                      mi != mapAddresses.end();)
genesis              2571                 {
genesis              2572                     const CAddress& addr = (*mi).second;
genesis              2573                     if (addr.nTime < nSince)
genesis              2574                     {
genesis              2575                         if (mapAddresses.size() < 1000 || GetTime() > nLastClear + 20)
genesis              2576                             break;
genesis              2577                         addrdb.EraseAddress(addr);
genesis              2578                         mapAddresses.erase(mi++);
genesis              2579                     }
genesis              2580                     else
genesis              2581                         mi++;
genesis              2582                 }
genesis              2583             }
genesis              2584         }
genesis              2585 
genesis              2586 
genesis              2587         //
genesis              2588         // Message: addr
genesis              2589         //
genesis              2590         if (fSendTrickle)
genesis              2591         {
genesis              2592             vector<CAddress> vAddr;
genesis              2593             vAddr.reserve(pto->vAddrToSend.size());
genesis              2594             BOOST_FOREACH(const CAddress& addr, pto->vAddrToSend)
genesis              2595             {
genesis              2596                 // returns true if wasn't already contained in the set
genesis              2597                 if (pto->setAddrKnown.insert(addr).second)
genesis              2598                 {
genesis              2599                     vAddr.push_back(addr);
genesis              2600                     // receiver rejects addr messages larger than 1000
genesis              2601                     if (vAddr.size() >= 1000)
genesis              2602                     {
genesis              2603                         pto->PushMessage("addr", vAddr);
genesis              2604                         vAddr.clear();
genesis              2605                     }
genesis              2606                 }
genesis              2607             }
genesis              2608             pto->vAddrToSend.clear();
genesis              2609             if (!vAddr.empty())
genesis              2610                 pto->PushMessage("addr", vAddr);
genesis              2611         }
genesis              2612 
genesis              2613 
genesis              2614         //
genesis              2615         // Message: inventory
genesis              2616         //
genesis              2617         vector<CInv> vInv;
genesis              2618         vector<CInv> vInvWait;
genesis              2619         CRITICAL_BLOCK(pto->cs_inventory)
genesis              2620         {
genesis              2621             vInv.reserve(pto->vInventoryToSend.size());
genesis              2622             vInvWait.reserve(pto->vInventoryToSend.size());
genesis              2623             BOOST_FOREACH(const CInv& inv, pto->vInventoryToSend)
genesis              2624             {
genesis              2625                 if (pto->setInventoryKnown.count(inv))
genesis              2626                     continue;
genesis              2627 
genesis              2628                 // trickle out tx inv to protect privacy
genesis              2629                 if (inv.type == MSG_TX && !fSendTrickle)
genesis              2630                 {
genesis              2631                     // 1/4 of tx invs blast to all immediately
genesis              2632                     static uint256 hashSalt;
genesis              2633                     if (hashSalt == 0)
genesis              2634                         RAND_bytes((unsigned char*)&hashSalt, sizeof(hashSalt));
genesis              2635                     uint256 hashRand = inv.hash ^ hashSalt;
genesis              2636                     hashRand = Hash(BEGIN(hashRand), END(hashRand));
genesis              2637                     bool fTrickleWait = ((hashRand & 3) != 0);
genesis              2638 
genesis              2639                     // always trickle our own transactions
genesis              2640                     if (!fTrickleWait)
genesis              2641                     {
genesis              2642                         CWalletTx wtx;
genesis              2643                         if (GetTransaction(inv.hash, wtx))
genesis              2644                             if (wtx.fFromMe)
genesis              2645                                 fTrickleWait = true;
genesis              2646                     }
genesis              2647 
genesis              2648                     if (fTrickleWait)
genesis              2649                     {
genesis              2650                         vInvWait.push_back(inv);
genesis              2651                         continue;
genesis              2652                     }
genesis              2653                 }
genesis              2654 
genesis              2655                 // returns true if wasn't already contained in the set
genesis              2656                 if (pto->setInventoryKnown.insert(inv).second)
genesis              2657                 {
genesis              2658                     vInv.push_back(inv);
genesis              2659                     if (vInv.size() >= 1000)
genesis              2660                     {
genesis              2661                         pto->PushMessage("inv", vInv);
genesis              2662                         vInv.clear();
genesis              2663                     }
genesis              2664                 }
genesis              2665             }
genesis              2666             pto->vInventoryToSend = vInvWait;
genesis              2667         }
genesis              2668         if (!vInv.empty())
genesis              2669             pto->PushMessage("inv", vInv);
genesis              2670 
genesis              2671 
genesis              2672         //
genesis              2673         // Message: getdata
genesis              2674         //
genesis              2675         vector<CInv> vGetData;
genesis              2676         int64 nNow = GetTime() * 1000000;
genesis              2677         CTxDB txdb("r");
genesis              2678         while (!pto->mapAskFor.empty() && (*pto->mapAskFor.begin()).first <= nNow)
genesis              2679         {
genesis              2680             const CInv& inv = (*pto->mapAskFor.begin()).second;
genesis              2681             if (!AlreadyHave(txdb, inv))
genesis              2682             {
genesis              2683                 printf("sending getdata: %s\n", inv.ToString().c_str());
genesis              2684                 vGetData.push_back(inv);
genesis              2685                 if (vGetData.size() >= 1000)
genesis              2686                 {
genesis              2687                     pto->PushMessage("getdata", vGetData);
genesis              2688                     vGetData.clear();
genesis              2689                 }
genesis              2690             }
genesis              2691             mapAlreadyAskedFor[inv] = nNow;
genesis              2692             pto->mapAskFor.erase(pto->mapAskFor.begin());
genesis              2693         }
genesis              2694         if (!vGetData.empty())
genesis              2695             pto->PushMessage("getdata", vGetData);
genesis              2696 
genesis              2697     }
genesis              2698     return true;
genesis              2699 }
genesis              2700 
genesis              2701 
genesis              2702 
genesis              2703 
genesis              2704 
genesis              2705 
genesis              2706 
genesis              2707 
genesis              2708 
genesis              2709 
genesis              2710 
genesis              2711 
genesis              2712 
genesis              2713 
genesis              2714 //////////////////////////////////////////////////////////////////////////////
genesis              2715 //
genesis              2716 // BitcoinMiner
genesis              2717 //
genesis              2718 
genesis              2719 int static FormatHashBlocks(void* pbuffer, unsigned int len)
genesis              2720 {
genesis              2721     unsigned char* pdata = (unsigned char*)pbuffer;
genesis              2722     unsigned int blocks = 1 + ((len + 8) / 64);
genesis              2723     unsigned char* pend = pdata + 64 * blocks;
genesis              2724     memset(pdata + len, 0, 64 * blocks - len);
genesis              2725     pdata[len] = 0x80;
genesis              2726     unsigned int bits = len * 8;
genesis              2727     pend[-1] = (bits >> 0) & 0xff;
genesis              2728     pend[-2] = (bits >> 8) & 0xff;
genesis              2729     pend[-3] = (bits >> 16) & 0xff;
genesis              2730     pend[-4] = (bits >> 24) & 0xff;
genesis              2731     return blocks;
genesis              2732 }
genesis              2733 
genesis              2734 static const unsigned int pSHA256InitState[8] =
genesis              2735 {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
genesis              2736 
genesis              2737 void SHA256Transform(void* pstate, void* pinput, const void* pinit)
genesis              2738 {
genesis              2739     SHA256_CTX ctx;
genesis              2740     unsigned char data[64];
genesis              2741 
genesis              2742     SHA256_Init(&ctx);
genesis              2743 
genesis              2744     for (int i = 0; i < 16; i++)
genesis              2745         ((uint32_t*)data)[i] = ByteReverse(((uint32_t*)pinput)[i]);
genesis              2746 
genesis              2747     for (int i = 0; i < 8; i++)
genesis              2748         ctx.h[i] = ((uint32_t*)pinit)[i];
genesis              2749 
genesis              2750     SHA256_Update(&ctx, data, sizeof(data));
genesis              2751     for (int i = 0; i < 8; i++) 
genesis              2752         ((uint32_t*)pstate)[i] = ctx.h[i];
genesis              2753 }
genesis              2754 
genesis              2755 //
genesis              2756 // ScanHash scans nonces looking for a hash with at least some zero bits.
genesis              2757 // It operates on big endian data.  Caller does the byte reversing.
genesis              2758 // All input buffers are 16-byte aligned.  nNonce is usually preserved
genesis              2759 // between calls, but periodically or if nNonce is 0xffff0000 or above,
genesis              2760 // the block is rebuilt and nNonce starts over at zero.
genesis              2761 //
genesis              2762 unsigned int static ScanHash_CryptoPP(char* pmidstate, char* pdata, char* phash1, char* phash, unsigned int& nHashesDone)
genesis              2763 {
genesis              2764     unsigned int& nNonce = *(unsigned int*)(pdata + 12);
genesis              2765     for (;;)
genesis              2766     {
genesis              2767         // Crypto++ SHA-256
genesis              2768         // Hash pdata using pmidstate as the starting state into
genesis              2769         // preformatted buffer phash1, then hash phash1 into phash
genesis              2770         nNonce++;
genesis              2771         SHA256Transform(phash1, pdata, pmidstate);
genesis              2772         SHA256Transform(phash, phash1, pSHA256InitState);
genesis              2773 
genesis              2774         // Return the nonce if the hash has at least some zero bits,
genesis              2775         // caller will check if it has enough to reach the target
genesis              2776         if (((unsigned short*)phash)[14] == 0)
genesis              2777             return nNonce;
genesis              2778 
genesis              2779         // If nothing found after trying for a while, return -1
genesis              2780         if ((nNonce & 0xffff) == 0)
genesis              2781         {
genesis              2782             nHashesDone = 0xffff+1;
genesis              2783             return -1;
genesis              2784         }
genesis              2785     }
genesis              2786 }
genesis              2787 
genesis              2788 // Some explaining would be appreciated
genesis              2789 class COrphan
genesis              2790 {
genesis              2791 public:
genesis              2792     CTransaction* ptx;
genesis              2793     set<uint256> setDependsOn;
genesis              2794     double dPriority;
genesis              2795 
genesis              2796     COrphan(CTransaction* ptxIn)
genesis              2797     {
genesis              2798         ptx = ptxIn;
genesis              2799         dPriority = 0;
genesis              2800     }
genesis              2801 
genesis              2802     void print() const
genesis              2803     {
genesis              2804         printf("COrphan(hash=%s, dPriority=%.1f)\n", ptx->GetHash().ToString().substr(0,10).c_str(), dPriority);
genesis              2805         BOOST_FOREACH(uint256 hash, setDependsOn)
genesis              2806             printf("   setDependsOn %s\n", hash.ToString().substr(0,10).c_str());
genesis              2807     }
genesis              2808 };
genesis              2809 
genesis              2810 
genesis              2811 CBlock* CreateNewBlock(CReserveKey& reservekey)
genesis              2812 {
genesis              2813     CBlockIndex* pindexPrev = pindexBest;
genesis              2814 
genesis              2815     // Create new block
genesis              2816     auto_ptr<CBlock> pblock(new CBlock());
genesis              2817     if (!pblock.get())
genesis              2818         return NULL;
genesis              2819 
genesis              2820     // Create coinbase tx
genesis              2821     CTransaction txNew;
genesis              2822     txNew.vin.resize(1);
genesis              2823     txNew.vin[0].prevout.SetNull();
genesis              2824     txNew.vout.resize(1);
genesis              2825     txNew.vout[0].scriptPubKey << reservekey.GetReservedKey() << OP_CHECKSIG;
genesis              2826 
genesis              2827     // Add our coinbase tx as first transaction
genesis              2828     pblock->vtx.push_back(txNew);
genesis              2829 
genesis              2830     // Collect memory pool transactions into the block
genesis              2831     int64 nFees = 0;
genesis              2832     CRITICAL_BLOCK(cs_main)
genesis              2833     CRITICAL_BLOCK(cs_mapTransactions)
genesis              2834     {
genesis              2835         CTxDB txdb("r");
genesis              2836 
genesis              2837         // Priority order to process transactions
genesis              2838         list<COrphan> vOrphan; // list memory doesn't move
genesis              2839         map<uint256, vector<COrphan*> > mapDependers;
genesis              2840         multimap<double, CTransaction*> mapPriority;
genesis              2841         for (map<uint256, CTransaction>::iterator mi = mapTransactions.begin(); mi != mapTransactions.end(); ++mi)
genesis              2842         {
genesis              2843             CTransaction& tx = (*mi).second;
genesis              2844             if (tx.IsCoinBase() || !tx.IsFinal())
genesis              2845                 continue;
genesis              2846 
genesis              2847             COrphan* porphan = NULL;
genesis              2848             double dPriority = 0;
genesis              2849             BOOST_FOREACH(const CTxIn& txin, tx.vin)
genesis              2850             {
genesis              2851                 // Read prev transaction
genesis              2852                 CTransaction txPrev;
genesis              2853                 CTxIndex txindex;
genesis              2854                 if (!txPrev.ReadFromDisk(txdb, txin.prevout, txindex))
genesis              2855                 {
genesis              2856                     // Has to wait for dependencies
genesis              2857                     if (!porphan)
genesis              2858                     {
genesis              2859                         // Use list for automatic deletion
genesis              2860                         vOrphan.push_back(COrphan(&tx));
genesis              2861                         porphan = &vOrphan.back();
genesis              2862                     }
genesis              2863                     mapDependers[txin.prevout.hash].push_back(porphan);
genesis              2864                     porphan->setDependsOn.insert(txin.prevout.hash);
genesis              2865                     continue;
genesis              2866                 }
genesis              2867                 int64 nValueIn = txPrev.vout[txin.prevout.n].nValue;
genesis              2868 
genesis              2869                 // Read block header
genesis              2870                 int nConf = txindex.GetDepthInMainChain();
genesis              2871 
genesis              2872                 dPriority += (double)nValueIn * nConf;
genesis              2873 
genesis              2874                 if (fDebug && GetBoolArg("-printpriority"))
genesis              2875                     printf("priority     nValueIn=%-12I64d nConf=%-5d dPriority=%-20.1f\n", nValueIn, nConf, dPriority);
genesis              2876             }
genesis              2877 
genesis              2878             // Priority is sum(valuein * age) / txsize
genesis              2879             dPriority /= ::GetSerializeSize(tx, SER_NETWORK);
genesis              2880 
genesis              2881             if (porphan)
genesis              2882                 porphan->dPriority = dPriority;
genesis              2883             else
genesis              2884                 mapPriority.insert(make_pair(-dPriority, &(*mi).second));
genesis              2885 
genesis              2886             if (fDebug && GetBoolArg("-printpriority"))
genesis              2887             {
genesis              2888                 printf("priority %-20.1f %s\n%s", dPriority, tx.GetHash().ToString().substr(0,10).c_str(), tx.ToString().c_str());
genesis              2889                 if (porphan)
genesis              2890                     porphan->print();
genesis              2891                 printf("\n");
genesis              2892             }
genesis              2893         }
genesis              2894 
genesis              2895         // Collect transactions into block
genesis              2896         map<uint256, CTxIndex> mapTestPool;
genesis              2897         uint64 nBlockSize = 1000;
genesis              2898         int nBlockSigOps = 100;
genesis              2899         while (!mapPriority.empty())
genesis              2900         {
genesis              2901             // Take highest priority transaction off priority queue
genesis              2902             double dPriority = -(*mapPriority.begin()).first;
genesis              2903             CTransaction& tx = *(*mapPriority.begin()).second;
genesis              2904             mapPriority.erase(mapPriority.begin());
genesis              2905 
genesis              2906             // Size limits
genesis              2907             unsigned int nTxSize = ::GetSerializeSize(tx, SER_NETWORK);
genesis              2908             if (nBlockSize + nTxSize >= MAX_BLOCK_SIZE_GEN)
genesis              2909                 continue;
genesis              2910             int nTxSigOps = tx.GetSigOpCount();
genesis              2911             if (nBlockSigOps + nTxSigOps >= MAX_BLOCK_SIGOPS)
genesis              2912                 continue;
genesis              2913 
genesis              2914             // Transaction fee required depends on block size
genesis              2915             bool fAllowFree = (nBlockSize + nTxSize < 4000 || CTransaction::AllowFree(dPriority));
genesis              2916             int64 nMinFee = tx.GetMinFee(nBlockSize, fAllowFree);
genesis              2917 
genesis              2918             // Connecting shouldn't fail due to dependency on other memory pool transactions
genesis              2919             // because we're already processing them in order of dependency
genesis              2920             map<uint256, CTxIndex> mapTestPoolTmp(mapTestPool);
genesis              2921             bool fInvalid;
genesis              2922             if (!tx.ConnectInputs(txdb, mapTestPoolTmp, CDiskTxPos(1,1,1), pindexPrev, nFees, false, true, nMinFee, fInvalid))
genesis              2923                 continue;
genesis              2924             swap(mapTestPool, mapTestPoolTmp);
genesis              2925 
genesis              2926             // Added
genesis              2927             pblock->vtx.push_back(tx);
genesis              2928             nBlockSize += nTxSize;
genesis              2929             nBlockSigOps += nTxSigOps;
genesis              2930 
genesis              2931             // Add transactions that depend on this one to the priority queue
genesis              2932             uint256 hash = tx.GetHash();
genesis              2933             if (mapDependers.count(hash))
genesis              2934             {
genesis              2935                 BOOST_FOREACH(COrphan* porphan, mapDependers[hash])
genesis              2936                 {
genesis              2937                     if (!porphan->setDependsOn.empty())
genesis              2938                     {
genesis              2939                         porphan->setDependsOn.erase(hash);
genesis              2940                         if (porphan->setDependsOn.empty())
genesis              2941                             mapPriority.insert(make_pair(-porphan->dPriority, porphan->ptx));
genesis              2942                     }
genesis              2943                 }
genesis              2944             }
genesis              2945         }
genesis              2946     }
genesis              2947     pblock->vtx[0].vout[0].nValue = GetBlockValue(pindexPrev->nHeight+1, nFees);
genesis              2948 
genesis              2949     // Fill in header
genesis              2950     pblock->hashPrevBlock  = pindexPrev->GetBlockHash();
genesis              2951     pblock->hashMerkleRoot = pblock->BuildMerkleTree();
genesis              2952     pblock->nTime          = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
genesis              2953     pblock->nBits          = GetNextWorkRequired(pindexPrev, pblock.get());
genesis              2954     pblock->nNonce         = 0;
genesis              2955 
genesis              2956     return pblock.release();
genesis              2957 }
genesis              2958 
genesis              2959 
genesis              2960 void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce)
genesis              2961 {
genesis              2962     // Update nExtraNonce
genesis              2963     static uint256 hashPrevBlock;
genesis              2964     if (hashPrevBlock != pblock->hashPrevBlock)
genesis              2965     {
genesis              2966         nExtraNonce = 0;
genesis              2967         hashPrevBlock = pblock->hashPrevBlock;
genesis              2968     }
genesis              2969     ++nExtraNonce;
genesis              2970     pblock->vtx[0].vin[0].scriptSig = CScript() << pblock->nTime << CBigNum(nExtraNonce);
genesis              2971     pblock->hashMerkleRoot = pblock->BuildMerkleTree();
genesis              2972 }
genesis              2973 
genesis              2974 
genesis              2975 void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1)
genesis              2976 {
genesis              2977     //
genesis              2978     // Prebuild hash buffers
genesis              2979     //
genesis              2980     struct
genesis              2981     {
genesis              2982         struct unnamed2
genesis              2983         {
genesis              2984             int nVersion;
genesis              2985             uint256 hashPrevBlock;
genesis              2986             uint256 hashMerkleRoot;
genesis              2987             unsigned int nTime;
genesis              2988             unsigned int nBits;
genesis              2989             unsigned int nNonce;
genesis              2990         }
genesis              2991         block;
genesis              2992         unsigned char pchPadding0[64];
genesis              2993         uint256 hash1;
genesis              2994         unsigned char pchPadding1[64];
genesis              2995     }
genesis              2996     tmp;
genesis              2997     memset(&tmp, 0, sizeof(tmp));
genesis              2998 
genesis              2999     tmp.block.nVersion       = pblock->nVersion;
genesis              3000     tmp.block.hashPrevBlock  = pblock->hashPrevBlock;
genesis              3001     tmp.block.hashMerkleRoot = pblock->hashMerkleRoot;
genesis              3002     tmp.block.nTime          = pblock->nTime;
genesis              3003     tmp.block.nBits          = pblock->nBits;
genesis              3004     tmp.block.nNonce         = pblock->nNonce;
genesis              3005 
genesis              3006     FormatHashBlocks(&tmp.block, sizeof(tmp.block));
genesis              3007     FormatHashBlocks(&tmp.hash1, sizeof(tmp.hash1));
genesis              3008 
genesis              3009     // Byte swap all the input buffer
genesis              3010     for (int i = 0; i < sizeof(tmp)/4; i++)
genesis              3011         ((unsigned int*)&tmp)[i] = ByteReverse(((unsigned int*)&tmp)[i]);
genesis              3012 
genesis              3013     // Precalc the first half of the first hash, which stays constant
genesis              3014     SHA256Transform(pmidstate, &tmp.block, pSHA256InitState);
genesis              3015 
genesis              3016     memcpy(pdata, &tmp.block, 128);
genesis              3017     memcpy(phash1, &tmp.hash1, 64);
genesis              3018 }
genesis              3019 
genesis              3020 
genesis              3021 bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey)
genesis              3022 {
genesis              3023     uint256 hash = pblock->GetHash();
genesis              3024     uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
genesis              3025 
genesis              3026     if (hash > hashTarget)
genesis              3027         return false;
genesis              3028 
genesis              3029     //// debug print
genesis              3030     printf("BitcoinMiner:\n");
genesis              3031     printf("proof-of-work found  \n  hash: %s  \ntarget: %s\n", hash.GetHex().c_str(), hashTarget.GetHex().c_str());
genesis              3032     pblock->print();
genesis              3033     printf("%s ", DateTimeStrFormat("%x %H:%M", GetTime()).c_str());
genesis              3034     printf("generated %s\n", FormatMoney(pblock->vtx[0].vout[0].nValue).c_str());
genesis              3035 
genesis              3036     // Found a solution
genesis              3037     CRITICAL_BLOCK(cs_main)
genesis              3038     {
genesis              3039         if (pblock->hashPrevBlock != hashBestChain)
genesis              3040             return error("BitcoinMiner : generated block is stale");
genesis              3041 
genesis              3042         // Remove key from key pool
genesis              3043         reservekey.KeepKey();
genesis              3044 
genesis              3045         // Track how many getdata requests this block gets
genesis              3046         CRITICAL_BLOCK(wallet.cs_wallet)
genesis              3047             wallet.mapRequestCount[pblock->GetHash()] = 0;
genesis              3048 
genesis              3049         // Process this block the same as if we had received it from another node
genesis              3050         if (!ProcessBlock(NULL, pblock))
genesis              3051             return error("BitcoinMiner : ProcessBlock, block not accepted");
genesis              3052     }
genesis              3053 
genesis              3054     return true;
genesis              3055 }
genesis              3056 
genesis              3057 void static ThreadBitcoinMiner(void* parg);
genesis              3058 
genesis              3059 void static BitcoinMiner(CWallet *pwallet)
genesis              3060 {
genesis              3061     printf("BitcoinMiner started\n");
genesis              3062     SetThreadPriority(THREAD_PRIORITY_LOWEST);
genesis              3063 
genesis              3064     // Each thread has its own key and counter
genesis              3065     CReserveKey reservekey(pwallet);
genesis              3066     unsigned int nExtraNonce = 0;
genesis              3067 
genesis              3068     while (fGenerateBitcoins)
genesis              3069     {
genesis              3070         if (AffinityBugWorkaround(ThreadBitcoinMiner))
genesis              3071             return;
genesis              3072         if (fShutdown)
genesis              3073             return;
genesis              3074         while (vNodes.empty() || IsInitialBlockDownload())
genesis              3075         {
genesis              3076             Sleep(1000);
genesis              3077             if (fShutdown)
genesis              3078                 return;
genesis              3079             if (!fGenerateBitcoins)
genesis              3080                 return;
genesis              3081         }
genesis              3082 
genesis              3083 
genesis              3084         //
genesis              3085         // Create new block
genesis              3086         //
genesis              3087         unsigned int nTransactionsUpdatedLast = nTransactionsUpdated;
genesis              3088         CBlockIndex* pindexPrev = pindexBest;
genesis              3089 
genesis              3090         auto_ptr<CBlock> pblock(CreateNewBlock(reservekey));
genesis              3091         if (!pblock.get())
genesis              3092             return;
genesis              3093         IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce);
genesis              3094 
genesis              3095         printf("Running BitcoinMiner with %d transactions in block\n", pblock->vtx.size());
genesis              3096 
genesis              3097 
genesis              3098         //
genesis              3099         // Prebuild hash buffers
genesis              3100         //
genesis              3101         char pmidstatebuf[32+16]; char* pmidstate = alignup<16>(pmidstatebuf);
genesis              3102         char pdatabuf[128+16];    char* pdata     = alignup<16>(pdatabuf);
genesis              3103         char phash1buf[64+16];    char* phash1    = alignup<16>(phash1buf);
genesis              3104 
genesis              3105         FormatHashBuffers(pblock.get(), pmidstate, pdata, phash1);
genesis              3106 
genesis              3107         unsigned int& nBlockTime = *(unsigned int*)(pdata + 64 + 4);
genesis              3108         unsigned int& nBlockNonce = *(unsigned int*)(pdata + 64 + 12);
genesis              3109 
genesis              3110 
genesis              3111         //
genesis              3112         // Search
genesis              3113         //
genesis              3114         int64 nStart = GetTime();
genesis              3115         uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
genesis              3116         uint256 hashbuf[2];
genesis              3117         uint256& hash = *alignup<16>(hashbuf);
genesis              3118         loop
genesis              3119         {
genesis              3120             unsigned int nHashesDone = 0;
genesis              3121             unsigned int nNonceFound;
genesis              3122 
genesis              3123             // Crypto++ SHA-256
genesis              3124             nNonceFound = ScanHash_CryptoPP(pmidstate, pdata + 64, phash1,
genesis              3125                                             (char*)&hash, nHashesDone);
genesis              3126 
genesis              3127             // Check if something found
genesis              3128             if (nNonceFound != -1)
genesis              3129             {
genesis              3130                 for (int i = 0; i < sizeof(hash)/4; i++)
genesis              3131                     ((unsigned int*)&hash)[i] = ByteReverse(((unsigned int*)&hash)[i]);
genesis              3132 
genesis              3133                 if (hash <= hashTarget)
genesis              3134                 {
genesis              3135                     // Found a solution
genesis              3136                     pblock->nNonce = ByteReverse(nNonceFound);
genesis              3137                     assert(hash == pblock->GetHash());
genesis              3138 
genesis              3139                     SetThreadPriority(THREAD_PRIORITY_NORMAL);
genesis              3140                     CheckWork(pblock.get(), *pwalletMain, reservekey);
genesis              3141                     SetThreadPriority(THREAD_PRIORITY_LOWEST);
genesis              3142                     break;
genesis              3143                 }
genesis              3144             }
genesis              3145 
genesis              3146             // Meter hashes/sec
genesis              3147             static int64 nHashCounter;
genesis              3148             if (nHPSTimerStart == 0)
genesis              3149             {
genesis              3150                 nHPSTimerStart = GetTimeMillis();
genesis              3151                 nHashCounter = 0;
genesis              3152             }
genesis              3153             else
genesis              3154                 nHashCounter += nHashesDone;
genesis              3155             if (GetTimeMillis() - nHPSTimerStart > 4000)
genesis              3156             {
genesis              3157                 static CCriticalSection cs;
genesis              3158                 CRITICAL_BLOCK(cs)
genesis              3159                 {
genesis              3160                     if (GetTimeMillis() - nHPSTimerStart > 4000)
genesis              3161                     {
genesis              3162                         dHashesPerSec = 1000.0 * nHashCounter / (GetTimeMillis() - nHPSTimerStart);
genesis              3163                         nHPSTimerStart = GetTimeMillis();
genesis              3164                         nHashCounter = 0;
genesis              3165                         string strStatus = strprintf("    %.0f khash/s", dHashesPerSec/1000.0);
genesis              3166                         UIThreadCall(boost::bind(CalledSetStatusBar, strStatus, 0));
genesis              3167                         static int64 nLogTime;
genesis              3168                         if (GetTime() - nLogTime > 30 * 60)
genesis              3169                         {
genesis              3170                             nLogTime = GetTime();
genesis              3171                             printf("%s ", DateTimeStrFormat("%x %H:%M", GetTime()).c_str());
genesis              3172                             printf("hashmeter %3d CPUs %6.0f khash/s\n", vnThreadsRunning[3], dHashesPerSec/1000.0);
genesis              3173                         }
genesis              3174                     }
genesis              3175                 }
genesis              3176             }
genesis              3177 
genesis              3178             // Check for stop or if block needs to be rebuilt
genesis              3179             if (fShutdown)
genesis              3180                 return;
genesis              3181             if (!fGenerateBitcoins)
genesis              3182                 return;
genesis              3183             if (fLimitProcessors && vnThreadsRunning[3] > nLimitProcessors)
genesis              3184                 return;
genesis              3185             if (vNodes.empty())
genesis              3186                 break;
genesis              3187             if (nBlockNonce >= 0xffff0000)
genesis              3188                 break;
genesis              3189             if (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 60)
genesis              3190                 break;
genesis              3191             if (pindexPrev != pindexBest)
genesis              3192                 break;
genesis              3193 
genesis              3194             // Update nTime every few seconds
genesis              3195             pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
genesis              3196             nBlockTime = ByteReverse(pblock->nTime);
genesis              3197         }
genesis              3198     }
genesis              3199 }
genesis              3200 
genesis              3201 void static ThreadBitcoinMiner(void* parg)
genesis              3202 {
genesis              3203     CWallet* pwallet = (CWallet*)parg;
genesis              3204     try
genesis              3205     {
genesis              3206         vnThreadsRunning[3]++;
genesis              3207         BitcoinMiner(pwallet);
genesis              3208         vnThreadsRunning[3]--;
genesis              3209     }
genesis              3210     catch (std::exception& e) {
genesis              3211         vnThreadsRunning[3]--;
genesis              3212         PrintException(&e, "ThreadBitcoinMiner()");
genesis              3213     } catch (...) {
genesis              3214         vnThreadsRunning[3]--;
genesis              3215         PrintException(NULL, "ThreadBitcoinMiner()");
genesis              3216     }
genesis              3217     UIThreadCall(boost::bind(CalledSetStatusBar, "", 0));
genesis              3218     nHPSTimerStart = 0;
genesis              3219     if (vnThreadsRunning[3] == 0)
genesis              3220         dHashesPerSec = 0;
genesis              3221     printf("ThreadBitcoinMiner exiting, %d threads remaining\n", vnThreadsRunning[3]);
genesis              3222 }
genesis              3223 
genesis              3224 
genesis              3225 void GenerateBitcoins(bool fGenerate, CWallet* pwallet)
genesis              3226 {
genesis              3227     if (fGenerateBitcoins != fGenerate)
genesis              3228     {
genesis              3229         fGenerateBitcoins = fGenerate;
genesis              3230         WriteSetting("fGenerateBitcoins", fGenerateBitcoins);
genesis              3231         MainFrameRepaint();
genesis              3232     }
genesis              3233     if (fGenerateBitcoins)
genesis              3234     {
genesis              3235         int nProcessors = boost::thread::hardware_concurrency();
genesis              3236         printf("%d processors\n", nProcessors);
genesis              3237         if (nProcessors < 1)
genesis              3238             nProcessors = 1;
genesis              3239         if (fLimitProcessors && nProcessors > nLimitProcessors)
genesis              3240             nProcessors = nLimitProcessors;
genesis              3241         int nAddThreads = nProcessors - vnThreadsRunning[3];
genesis              3242         printf("Starting %d BitcoinMiner threads\n", nAddThreads);
genesis              3243         for (int i = 0; i < nAddThreads; i++)
genesis              3244         {
genesis              3245             if (!CreateThread(ThreadBitcoinMiner, pwallet))
genesis              3246                 printf("Error: CreateThread(ThreadBitcoinMiner) failed\n");
genesis              3247             Sleep(10);
genesis              3248         }
genesis              3249     }
genesis              3250 }