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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file license.txt or http://www.opensource.org/licenses/mit-license.php.
#include "headers.h"
#include "checkpoints.h"
#include "db.h"
#include "net.h"
#include "init.h"
#include <boost/algorithm/string/replace.hpp>
#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>
using namespace std;
using namespace boost;
//
// Global state
//
// Name of client reported in the 'version' message. Report the same name
// for both bitcoind and bitcoin-qt, to make it harder for attackers to
// target servers or GUI users specifically.
const std::string CLIENT_NAME("Satoshi");
CCriticalSection cs_setpwalletRegistered;
set<CWallet*> setpwalletRegistered;
CCriticalSection cs_main;
static map<uint256, CTransaction> mapTransactions;
CCriticalSection cs_mapTransactions;
unsigned int nTransactionsUpdated = 0;
map<COutPoint, CInPoint> mapNextTx;
map<uint256, CBlockIndex*> mapBlockIndex;
uint256 hashGenesisBlock("0x000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f");
static CBigNum bnProofOfWorkLimit(~uint256(0) >> 32);
CBlockIndex* pindexGenesisBlock = NULL;
int nBestHeight = -1;
CBigNum bnBestChainWork = 0;
CBigNum bnBestInvalidWork = 0;
uint256 hashBestChain = 0;
CBlockIndex* pindexBest = NULL;
int64 nTimeBestReceived = 0;
CMedianFilter<int> cPeerBlockCounts(5, 0); // Amount of blocks that other nodes claim to have
map<uint256, CBlock*> mapOrphanBlocks;
multimap<uint256, CBlock*> mapOrphanBlocksByPrev;
map<uint256, CDataStream*> mapOrphanTransactions;
multimap<uint256, CDataStream*> mapOrphanTransactionsByPrev;
// Constant stuff for coinbase transactions we create:
CScript COINBASE_FLAGS;
const string strMessageMagic = "Bitcoin Signed Message:\n";
double dHashesPerSec;
int64 nHPSTimerStart;
// Settings
int64 nTransactionFee = 0;
//////////////////////////////////////////////////////////////////////////////
//
// dispatching functions
//
// These functions dispatch to one or all registered wallets
void RegisterWallet(CWallet* pwalletIn)
{
CRITICAL_BLOCK(cs_setpwalletRegistered)
{
setpwalletRegistered.insert(pwalletIn);
}
}
void UnregisterWallet(CWallet* pwalletIn)
{
CRITICAL_BLOCK(cs_setpwalletRegistered)
{
setpwalletRegistered.erase(pwalletIn);
}
}
// check whether the passed transaction is from us
bool static IsFromMe(CTransaction& tx)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
if (pwallet->IsFromMe(tx))
return true;
return false;
}
// get the wallet transaction with the given hash (if it exists)
bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
if (pwallet->GetTransaction(hashTx,wtx))
return true;
return false;
}
// erases transaction with the given hash from all wallets
void static EraseFromWallets(uint256 hash)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->EraseFromWallet(hash);
}
// make sure all wallets know about the given transaction, in the given block
void static SyncWithWallets(const CTransaction& tx, const CBlock* pblock = NULL, bool fUpdate = false)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->AddToWalletIfInvolvingMe(tx, pblock, fUpdate);
}
// notify wallets about a new best chain
void static SetBestChain(const CBlockLocator& loc)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->SetBestChain(loc);
}
// notify wallets about an updated transaction
void static UpdatedTransaction(const uint256& hashTx)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->UpdatedTransaction(hashTx);
}
// dump all wallets
void static PrintWallets(const CBlock& block)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->PrintWallet(block);
}
// notify wallets about an incoming inventory (for request counts)
void static Inventory(const uint256& hash)
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->Inventory(hash);
}
// ask wallets to resend their transactions
void static ResendWalletTransactions()
{
BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
pwallet->ResendWalletTransactions();
}
//////////////////////////////////////////////////////////////////////////////
//
// mapOrphanTransactions
//
void AddOrphanTx(const CDataStream& vMsg)
{
CTransaction tx;
CDataStream(vMsg) >> tx;
uint256 hash = tx.GetHash();
if (mapOrphanTransactions.count(hash))
return;
CDataStream* pvMsg = mapOrphanTransactions[hash] = new CDataStream(vMsg);
BOOST_FOREACH(const CTxIn& txin, tx.vin)
mapOrphanTransactionsByPrev.insert(make_pair(txin.prevout.hash, pvMsg));
}
void static EraseOrphanTx(uint256 hash)
{
if (!mapOrphanTransactions.count(hash))
return;
const CDataStream* pvMsg = mapOrphanTransactions[hash];
CTransaction tx;
CDataStream(*pvMsg) >> tx;
BOOST_FOREACH(const CTxIn& txin, tx.vin)
{
for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(txin.prevout.hash);
mi != mapOrphanTransactionsByPrev.upper_bound(txin.prevout.hash);)
{
if ((*mi).second == pvMsg)
mapOrphanTransactionsByPrev.erase(mi++);
else
mi++;
}
}
delete pvMsg;
mapOrphanTransactions.erase(hash);
}
int LimitOrphanTxSize(int nMaxOrphans)
{
int nEvicted = 0;
while (mapOrphanTransactions.size() > nMaxOrphans)
{
// Evict a random orphan:
std::vector<unsigned char> randbytes(32);
RAND_bytes(&randbytes[0], 32);
uint256 randomhash(randbytes);
map<uint256, CDataStream*>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
if (it == mapOrphanTransactions.end())
it = mapOrphanTransactions.begin();
EraseOrphanTx(it->first);
++nEvicted;
}
return nEvicted;
}
//////////////////////////////////////////////////////////////////////////////
//
// CTransaction and CTxIndex
//
bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout, CTxIndex& txindexRet)
{
SetNull();
if (!txdb.ReadTxIndex(prevout.hash, txindexRet))
return false;
if (!ReadFromDisk(txindexRet.pos))
return false;
if (prevout.n >= vout.size())
{
SetNull();
return false;
}
return true;
}
bool CTransaction::ReadFromDisk(CTxDB& txdb, COutPoint prevout)
{
CTxIndex txindex;
return ReadFromDisk(txdb, prevout, txindex);
}
bool CTransaction::ReadFromDisk(COutPoint prevout)
{
CTxDB txdb("r");
CTxIndex txindex;
return ReadFromDisk(txdb, prevout, txindex);
}
bool CTransaction::IsStandard() const
{
BOOST_FOREACH(const CTxIn& txin, vin)
{
// Biggest 'standard' txin is a 3-signature 3-of-3 CHECKMULTISIG
// pay-to-script-hash, which is 3 ~80-byte signatures, 3
// ~65-byte public keys, plus a few script ops.
if (txin.scriptSig.size() > 500)
return false;
if (!txin.scriptSig.IsPushOnly())
return false;
}
BOOST_FOREACH(const CTxOut& txout, vout)
if (!::IsStandard(txout.scriptPubKey))
return false;
return true;
}
//
// Check transaction inputs, and make sure any
// pay-to-script-hash transactions are evaluating IsStandard scripts
//
// Why bother? To avoid denial-of-service attacks; an attacker
// can submit a standard HASH... OP_EQUAL transaction,
// which will get accepted into blocks. The redemption
// script can be anything; an attacker could use a very
// expensive-to-check-upon-redemption script like:
// DUP CHECKSIG DROP ... repeated 100 times... OP_1
//
bool CTransaction::AreInputsStandard(const MapPrevTx& mapInputs) const
{
if (IsCoinBase())
return true; // Coinbases don't use vin normally
for (int i = 0; i < vin.size(); i++)
{
const CTxOut& prev = GetOutputFor(vin[i], mapInputs);
vector<vector<unsigned char> > vSolutions;
txnouttype whichType;
// get the scriptPubKey corresponding to this input:
const CScript& prevScript = prev.scriptPubKey;
if (!Solver(prevScript, whichType, vSolutions))
return false;
int nArgsExpected = ScriptSigArgsExpected(whichType, vSolutions);
// Transactions with extra stuff in their scriptSigs are
// non-standard. Note that this EvalScript() call will
// be quick, because if there are any operations
// beside "push data" in the scriptSig the
// IsStandard() call returns false
vector<vector<unsigned char> > stack;
if (!EvalScript(stack, vin[i].scriptSig, *this, i, 0))
return false;
if (whichType == TX_SCRIPTHASH)
{
if (stack.empty())
return false;
CScript subscript(stack.back().begin(), stack.back().end());
vector<vector<unsigned char> > vSolutions2;
txnouttype whichType2;
if (!Solver(subscript, whichType2, vSolutions2))
return false;
if (whichType2 == TX_SCRIPTHASH)
return false;
nArgsExpected += ScriptSigArgsExpected(whichType2, vSolutions2);
}
if (stack.size() != nArgsExpected)
return false;
}
return true;
}
int
CTransaction::GetLegacySigOpCount() const
{
int nSigOps = 0;
BOOST_FOREACH(const CTxIn& txin, vin)
{
nSigOps += txin.scriptSig.GetSigOpCount(false);
}
BOOST_FOREACH(const CTxOut& txout, vout)
{
nSigOps += txout.scriptPubKey.GetSigOpCount(false);
}
return nSigOps;
}
int CMerkleTx::SetMerkleBranch(const CBlock* pblock)
{
if (fClient)
{
if (hashBlock == 0)
return 0;
}
else
{
CBlock blockTmp;
if (pblock == NULL)
{
// Load the block this tx is in
CTxIndex txindex;
if (!CTxDB("r").ReadTxIndex(GetHash(), txindex))
return 0;
if (!blockTmp.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos))
return 0;
pblock = &blockTmp;
}
// Update the tx's hashBlock
hashBlock = pblock->GetHash();
// Locate the transaction
for (nIndex = 0; nIndex < pblock->vtx.size(); nIndex++)
if (pblock->vtx[nIndex] == *(CTransaction*)this)
break;
if (nIndex == pblock->vtx.size())
{
vMerkleBranch.clear();
nIndex = -1;
printf("ERROR: SetMerkleBranch() : couldn't find tx in block\n");
return 0;
}
// Fill in merkle branch
vMerkleBranch = pblock->GetMerkleBranch(nIndex);
}
// Is the tx in a block that's in the main chain
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
if (mi == mapBlockIndex.end())
return 0;
CBlockIndex* pindex = (*mi).second;
if (!pindex || !pindex->IsInMainChain())
return 0;
return pindexBest->nHeight - pindex->nHeight + 1;
}
bool CTransaction::CheckTransaction() const
{
// Basic checks that don't depend on any context
if (vin.empty())
return DoS(10, error("CTransaction::CheckTransaction() : vin empty"));
if (vout.empty())
return DoS(10, error("CTransaction::CheckTransaction() : vout empty"));
// Size limits
if (::GetSerializeSize(*this, SER_NETWORK) > MAX_BLOCK_SIZE)
return DoS(100, error("CTransaction::CheckTransaction() : size limits failed"));
// Check for negative or overflow output values
int64 nValueOut = 0;
BOOST_FOREACH(const CTxOut& txout, vout)
{
if (txout.nValue < 0)
return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue negative"));
if (txout.nValue > MAX_MONEY)
return DoS(100, error("CTransaction::CheckTransaction() : txout.nValue too high"));
nValueOut += txout.nValue;
if (!MoneyRange(nValueOut))
return DoS(100, error("CTransaction::CheckTransaction() : txout total out of range"));
}
// Check for duplicate inputs
set<COutPoint> vInOutPoints;
BOOST_FOREACH(const CTxIn& txin, vin)
{
if (vInOutPoints.count(txin.prevout))
return false;
vInOutPoints.insert(txin.prevout);
}
if (IsCoinBase())
{
if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
return DoS(100, error("CTransaction::CheckTransaction() : coinbase script size"));
}
else
{
BOOST_FOREACH(const CTxIn& txin, vin)
if (txin.prevout.IsNull())
return DoS(10, error("CTransaction::CheckTransaction() : prevout is null"));
}
return true;
}
bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMissingInputs)
{
if (pfMissingInputs)
*pfMissingInputs = false;
if (!CheckTransaction())
return error("AcceptToMemoryPool() : CheckTransaction failed");
// Coinbase is only valid in a block, not as a loose transaction
if (IsCoinBase())
return DoS(100, error("AcceptToMemoryPool() : coinbase as individual tx"));
// To help v0.1.5 clients who would see it as a negative number
if ((int64)nLockTime > std::numeric_limits<int>::max())
return error("AcceptToMemoryPool() : not accepting nLockTime beyond 2038 yet");
// Rather not work on nonstandard transactions (unless -testnet)
if (!fTestNet && !IsStandard())
return error("AcceptToMemoryPool() : nonstandard transaction type");
// Do we already have it?
uint256 hash = GetHash();
CRITICAL_BLOCK(cs_mapTransactions)
if (mapTransactions.count(hash))
return false;
if (fCheckInputs)
if (txdb.ContainsTx(hash))
return false;
// Check for conflicts with in-memory transactions
CTransaction* ptxOld = NULL;
for (int i = 0; i < vin.size(); i++)
{
COutPoint outpoint = vin[i].prevout;
if (mapNextTx.count(outpoint))
{
// Disable replacement feature for now
return false;
// Allow replacing with a newer version of the same transaction
if (i != 0)
return false;
ptxOld = mapNextTx[outpoint].ptx;
if (ptxOld->IsFinal())
return false;
if (!IsNewerThan(*ptxOld))
return false;
for (int i = 0; i < vin.size(); i++)
{
COutPoint outpoint = vin[i].prevout;
if (!mapNextTx.count(outpoint) || mapNextTx[outpoint].ptx != ptxOld)
return false;
}
break;
}
}
if (fCheckInputs)
{
MapPrevTx mapInputs;
map<uint256, CTxIndex> mapUnused;
bool fInvalid = false;
if (!FetchInputs(txdb, mapUnused, false, false, mapInputs, fInvalid))
{
if (fInvalid)
return error("AcceptToMemoryPool() : FetchInputs found invalid tx %s", hash.ToString().substr(0,10).c_str());
if (pfMissingInputs)
*pfMissingInputs = true;
return error("AcceptToMemoryPool() : FetchInputs failed %s", hash.ToString().substr(0,10).c_str());
}
// Check for non-standard pay-to-script-hash in inputs
if (!AreInputsStandard(mapInputs) && !fTestNet)
return error("AcceptToMemoryPool() : nonstandard transaction input");
// Note: if you modify this code to accept non-standard transactions, then
// you should add code here to check that the transaction does a
// reasonable number of ECDSA signature verifications.
int64 nFees = GetValueIn(mapInputs)-GetValueOut();
unsigned int nSize = ::GetSerializeSize(*this, SER_NETWORK);
// Don't accept it if it can't get into a block
if (nFees < GetMinFee(1000, true, GMF_RELAY))
return error("AcceptToMemoryPool() : not enough fees");
// Continuously rate-limit free transactions
// This mitigates 'penny-flooding' -- sending thousands of free transactions just to
// be annoying or make other's transactions take longer to confirm.
if (nFees < MIN_RELAY_TX_FEE)
{
static CCriticalSection cs;
static double dFreeCount;
static int64 nLastTime;
int64 nNow = GetTime();
CRITICAL_BLOCK(cs)
{
// Use an exponentially decaying ~10-minute window:
dFreeCount *= pow(1.0 - 1.0/600.0, (double)(nNow - nLastTime));
nLastTime = nNow;
// -limitfreerelay unit is thousand-bytes-per-minute
// At default rate it would take over a month to fill 1GB
if (dFreeCount > GetArg("-limitfreerelay", 15)*10*1000 && !IsFromMe(*this))
return error("AcceptToMemoryPool() : free transaction rejected by rate limiter");
if (fDebug)
printf("Rate limit dFreeCount: %g => %g\n", dFreeCount, dFreeCount+nSize);
dFreeCount += nSize;
}
}
// Check against previous transactions
// This is done last to help prevent CPU exhaustion denial-of-service attacks.
if (!ConnectInputs(mapInputs, mapUnused, CDiskTxPos(1,1,1), pindexBest, false, false))
{
return error("AcceptToMemoryPool() : ConnectInputs failed %s", hash.ToString().substr(0,10).c_str());
}
}
// Store transaction in memory
CRITICAL_BLOCK(cs_mapTransactions)
{
if (ptxOld)
{
printf("AcceptToMemoryPool() : replacing tx %s with new version\n", ptxOld->GetHash().ToString().c_str());
ptxOld->RemoveFromMemoryPool();
}
AddToMemoryPoolUnchecked();
}
///// are we sure this is ok when loading transactions or restoring block txes
// If updated, erase old tx from wallet
if (ptxOld)
EraseFromWallets(ptxOld->GetHash());
printf("AcceptToMemoryPool(): accepted %s\n", hash.ToString().substr(0,10).c_str());
return true;
}
bool CTransaction::AcceptToMemoryPool(bool fCheckInputs, bool* pfMissingInputs)
{
CTxDB txdb("r");
return AcceptToMemoryPool(txdb, fCheckInputs, pfMissingInputs);
}
uint64 nPooledTx = 0;
bool CTransaction::AddToMemoryPoolUnchecked()
{
printf("AcceptToMemoryPoolUnchecked(): size %lu\n", mapTransactions.size());
// Add to memory pool without checking anything. Don't call this directly,
// call AcceptToMemoryPool to properly check the transaction first.
CRITICAL_BLOCK(cs_mapTransactions)
{
uint256 hash = GetHash();
mapTransactions[hash] = *this;
for (int i = 0; i < vin.size(); i++)
mapNextTx[vin[i].prevout] = CInPoint(&mapTransactions[hash], i);
nTransactionsUpdated++;
++nPooledTx;
}
return true;
}
bool CTransaction::RemoveFromMemoryPool()
{
// Remove transaction from memory pool
CRITICAL_BLOCK(cs_mapTransactions)
{
uint256 hash = GetHash();
if (mapTransactions.count(hash))
{
BOOST_FOREACH(const CTxIn& txin, vin)
mapNextTx.erase(txin.prevout);
mapTransactions.erase(hash);
nTransactionsUpdated++;
--nPooledTx;
}
}
return true;
}
int CMerkleTx::GetDepthInMainChain(CBlockIndex* &pindexRet) const
{
if (hashBlock == 0 || nIndex == -1)
return 0;
// Find the block it claims to be in
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
if (mi == mapBlockIndex.end())
return 0;
CBlockIndex* pindex = (*mi).second;
if (!pindex || !pindex->IsInMainChain())
return 0;
// Make sure the merkle branch connects to this block
if (!fMerkleVerified)
{
if (CBlock::CheckMerkleBranch(GetHash(), vMerkleBranch, nIndex) != pindex->hashMerkleRoot)
return 0;
fMerkleVerified = true;
}
pindexRet = pindex;
return pindexBest->nHeight - pindex->nHeight + 1;
}
int CMerkleTx::GetBlocksToMaturity() const
{
if (!IsCoinBase())
return 0;
return max(0, (COINBASE_MATURITY+20) - GetDepthInMainChain());
}
bool CMerkleTx::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs)
{
if (fClient)
{
if (!IsInMainChain() && !ClientConnectInputs())
return false;
return CTransaction::AcceptToMemoryPool(txdb, false);
}
else
{
return CTransaction::AcceptToMemoryPool(txdb, fCheckInputs);
}
}
bool CMerkleTx::AcceptToMemoryPool()
{
CTxDB txdb("r");
return AcceptToMemoryPool(txdb);
}
bool CWalletTx::AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs)
{
CRITICAL_BLOCK(cs_mapTransactions)
{
// Add previous supporting transactions first
BOOST_FOREACH(CMerkleTx& tx, vtxPrev)
{
if (!tx.IsCoinBase())
{
uint256 hash = tx.GetHash();
if (!mapTransactions.count(hash) && !txdb.ContainsTx(hash))
tx.AcceptToMemoryPool(txdb, fCheckInputs);
}
}
return AcceptToMemoryPool(txdb, fCheckInputs);
}
return false;
}
bool CWalletTx::AcceptWalletTransaction()
{
CTxDB txdb("r");
return AcceptWalletTransaction(txdb);
}
int CTxIndex::GetDepthInMainChain() const
{
// Read block header
CBlock block;
if (!block.ReadFromDisk(pos.nFile, pos.nBlockPos, false))
return 0;
// Find the block in the index
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(block.GetHash());
if (mi == mapBlockIndex.end())
return 0;
CBlockIndex* pindex = (*mi).second;
if (!pindex || !pindex->IsInMainChain())
return 0;
return 1 + nBestHeight - pindex->nHeight;
}
//////////////////////////////////////////////////////////////////////////////
//
// CBlock and CBlockIndex
//
bool CBlock::ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions)
{
if (!fReadTransactions)
{
*this = pindex->GetBlockHeader();
return true;
}
if (!ReadFromDisk(pindex->nFile, pindex->nBlockPos, fReadTransactions))
return false;
if (GetHash() != pindex->GetBlockHash())
return error("CBlock::ReadFromDisk() : GetHash() doesn't match index");
return true;
}
uint256 static GetOrphanRoot(const CBlock* pblock)
{
// Work back to the first block in the orphan chain
while (mapOrphanBlocks.count(pblock->hashPrevBlock))
pblock = mapOrphanBlocks[pblock->hashPrevBlock];
return pblock->GetHash();
}
int64 static GetBlockValue(int nHeight, int64 nFees)
{
int64 nSubsidy = 50 * COIN;
// Subsidy is cut in half every 4 years
nSubsidy >>= (nHeight / 210000);
return nSubsidy + nFees;
}
static const int64 nTargetTimespan = 14 * 24 * 60 * 60; // two weeks
static const int64 nTargetSpacing = 10 * 60;
static const int64 nInterval = nTargetTimespan / nTargetSpacing;
//
// minimum amount of work that could possibly be required nTime after
// minimum work required was nBase
//
unsigned int ComputeMinWork(unsigned int nBase, int64 nTime)
{
// Testnet has min-difficulty blocks
// after nTargetSpacing*2 time between blocks:
if (fTestNet && nTime > nTargetSpacing*2)
return bnProofOfWorkLimit.GetCompact();
CBigNum bnResult;
bnResult.SetCompact(nBase);
while (nTime > 0 && bnResult < bnProofOfWorkLimit)
{
// Maximum 400% adjustment...
bnResult *= 4;
// ... in best-case exactly 4-times-normal target time
nTime -= nTargetTimespan*4;
}
if (bnResult > bnProofOfWorkLimit)
bnResult = bnProofOfWorkLimit;
return bnResult.GetCompact();
}
unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlock *pblock)
{
unsigned int nProofOfWorkLimit = bnProofOfWorkLimit.GetCompact();
// Genesis block
if (pindexLast == NULL)
return nProofOfWorkLimit;
// Only change once per interval
if ((pindexLast->nHeight+1) % nInterval != 0)
{
// Special rules for testnet after 15 Feb 2012:
if (fTestNet && pblock->nTime > 1329264000)
{
// If the new block's timestamp is more than 2* 10 minutes
// then allow mining of a min-difficulty block.
if (pblock->nTime - pindexLast->nTime > nTargetSpacing*2)
return nProofOfWorkLimit;
else
{
// Return the last non-special-min-difficulty-rules-block
const CBlockIndex* pindex = pindexLast;
while (pindex->pprev && pindex->nHeight % nInterval != 0 && pindex->nBits == nProofOfWorkLimit)
pindex = pindex->pprev;
return pindex->nBits;
}
}
return pindexLast->nBits;
}
// Go back by what we want to be 14 days worth of blocks
const CBlockIndex* pindexFirst = pindexLast;
for (int i = 0; pindexFirst && i < nInterval-1; i++)
pindexFirst = pindexFirst->pprev;
assert(pindexFirst);
// Limit adjustment step
int64 nActualTimespan = pindexLast->GetBlockTime() - pindexFirst->GetBlockTime();
printf(" nActualTimespan = %"PRI64d" before bounds\n", nActualTimespan);
if (nActualTimespan < nTargetTimespan/4)
nActualTimespan = nTargetTimespan/4;
if (nActualTimespan > nTargetTimespan*4)
nActualTimespan = nTargetTimespan*4;
// Retarget
CBigNum bnNew;
bnNew.SetCompact(pindexLast->nBits);
bnNew *= nActualTimespan;
bnNew /= nTargetTimespan;
if (bnNew > bnProofOfWorkLimit)
bnNew = bnProofOfWorkLimit;
/// debug print
printf("GetNextWorkRequired RETARGET\n");
printf("nTargetTimespan = %"PRI64d" nActualTimespan = %"PRI64d"\n", nTargetTimespan, nActualTimespan);
printf("Before: %08x %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().ToString().c_str());
printf("After: %08x %s\n", bnNew.GetCompact(), bnNew.getuint256().ToString().c_str());
return bnNew.GetCompact();
}
bool CheckProofOfWork(uint256 hash, unsigned int nBits)
{
CBigNum bnTarget;
bnTarget.SetCompact(nBits);
// Check range
if (bnTarget <= 0 || bnTarget > bnProofOfWorkLimit)
return error("CheckProofOfWork() : nBits below minimum work");
// Check proof of work matches claimed amount
if (hash > bnTarget.getuint256())
return error("CheckProofOfWork() : hash doesn't match nBits");
return true;
}
// Return maximum amount of blocks that other nodes claim to have
int GetNumBlocksOfPeers()
{
return std::max(cPeerBlockCounts.median(), Checkpoints::GetTotalBlocksEstimate());
}
bool IsInitialBlockDownload()
{
if (pindexBest == NULL || nBestHeight < Checkpoints::GetTotalBlocksEstimate())
return true;
static int64 nLastUpdate;
static CBlockIndex* pindexLastBest;
if (pindexBest != pindexLastBest)
{
pindexLastBest = pindexBest;
nLastUpdate = GetTime();
}
return (GetTime() - nLastUpdate < 10 &&
pindexBest->GetBlockTime() < GetTime() - 24 * 60 * 60);
}
void static InvalidChainFound(CBlockIndex* pindexNew)
{
if (pindexNew->bnChainWork > bnBestInvalidWork)
{
bnBestInvalidWork = pindexNew->bnChainWork;
CTxDB().WriteBestInvalidWork(bnBestInvalidWork);
MainFrameRepaint();
}
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());
printf("InvalidChainFound: current best=%s height=%d work=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainWork.ToString().c_str());
if (pindexBest && bnBestInvalidWork > bnBestChainWork + pindexBest->GetBlockWork() * 6)
printf("InvalidChainFound: WARNING: Displayed transactions may not be correct! You may need to upgrade, or other nodes may need to upgrade.\n");
}
void CBlock::UpdateTime(const CBlockIndex* pindexPrev)
{
nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
// Updating time can change work required on testnet:
if (fTestNet)
nBits = GetNextWorkRequired(pindexPrev, this);
}
bool CTransaction::DisconnectInputs(CTxDB& txdb)
{
// Relinquish previous transactions' spent pointers
if (!IsCoinBase())
{
BOOST_FOREACH(const CTxIn& txin, vin)
{
COutPoint prevout = txin.prevout;
// Get prev txindex from disk
CTxIndex txindex;
if (!txdb.ReadTxIndex(prevout.hash, txindex))
return error("DisconnectInputs() : ReadTxIndex failed");
if (prevout.n >= txindex.vSpent.size())
return error("DisconnectInputs() : prevout.n out of range");
// Mark outpoint as not spent
txindex.vSpent[prevout.n].SetNull();
// Write back
if (!txdb.UpdateTxIndex(prevout.hash, txindex))
return error("DisconnectInputs() : UpdateTxIndex failed");
}
}
// Remove transaction from index
// This can fail if a duplicate of this transaction was in a chain that got
// reorganized away. This is only possible if this transaction was completely
// spent, so erasing it would be a no-op anway.
txdb.EraseTxIndex(*this);
return true;
}
bool CTransaction::FetchInputs(CTxDB& txdb, const map<uint256, CTxIndex>& mapTestPool,
bool fBlock, bool fMiner, MapPrevTx& inputsRet, bool& fInvalid)
{
// FetchInputs can return false either because we just haven't seen some inputs
// (in which case the transaction should be stored as an orphan)
// or because the transaction is malformed (in which case the transaction should
// be dropped). If tx is definitely invalid, fInvalid will be set to true.
fInvalid = false;
if (IsCoinBase())
return true; // Coinbase transactions have no inputs to fetch.
for (int i = 0; i < vin.size(); i++)
{
COutPoint prevout = vin[i].prevout;
if (inputsRet.count(prevout.hash))
continue; // Got it already
// Read txindex
CTxIndex& txindex = inputsRet[prevout.hash].first;
bool fFound = true;
if ((fBlock || fMiner) && mapTestPool.count(prevout.hash))
{
// Get txindex from current proposed changes
txindex = mapTestPool.find(prevout.hash)->second;
}
else
{
// Read txindex from txdb
fFound = txdb.ReadTxIndex(prevout.hash, txindex);
}
if (!fFound && (fBlock || fMiner))
return fMiner ? false : error("FetchInputs() : %s prev tx %s index entry not found", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
// Read txPrev
CTransaction& txPrev = inputsRet[prevout.hash].second;
if (!fFound || txindex.pos == CDiskTxPos(1,1,1))
{
// Get prev tx from single transactions in memory
CRITICAL_BLOCK(cs_mapTransactions)
{
if (!mapTransactions.count(prevout.hash))
return error("FetchInputs() : %s mapTransactions prev not found %s", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
txPrev = mapTransactions[prevout.hash];
}
if (!fFound)
txindex.vSpent.resize(txPrev.vout.size());
}
else
{
// Get prev tx from disk
if (!txPrev.ReadFromDisk(txindex.pos))
return error("FetchInputs() : %s ReadFromDisk prev tx %s failed", GetHash().ToString().substr(0,10).c_str(), prevout.hash.ToString().substr(0,10).c_str());
}
}
// Make sure all prevout.n's are valid:
for (int i = 0; i < vin.size(); i++)
{
const COutPoint prevout = vin[i].prevout;
assert(inputsRet.count(prevout.hash) != 0);
const CTxIndex& txindex = inputsRet[prevout.hash].first;
const CTransaction& txPrev = inputsRet[prevout.hash].second;
if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
{
// Revisit this if/when transaction replacement is implemented and allows
// adding inputs:
fInvalid = true;
return DoS(100, error("FetchInputs() : %s prevout.n out of range %d %d %d prev tx %s\n%s", GetHash().ToString().substr(0,10).c_str(), prevout.n, txPrev.vout.size(), txindex.vSpent.size(), prevout.hash.ToString().substr(0,10).c_str(), txPrev.ToString().c_str()));
}
}
return true;
}
const CTxOut& CTransaction::GetOutputFor(const CTxIn& input, const MapPrevTx& inputs) const
{
MapPrevTx::const_iterator mi = inputs.find(input.prevout.hash);
if (mi == inputs.end())
throw std::runtime_error("CTransaction::GetOutputFor() : prevout.hash not found");
const CTransaction& txPrev = (mi->second).second;
if (input.prevout.n >= txPrev.vout.size())
throw std::runtime_error("CTransaction::GetOutputFor() : prevout.n out of range");
return txPrev.vout[input.prevout.n];
}
int64 CTransaction::GetValueIn(const MapPrevTx& inputs) const
{
if (IsCoinBase())
return 0;
int64 nResult = 0;
for (int i = 0; i < vin.size(); i++)
{
nResult += GetOutputFor(vin[i], inputs).nValue;
}
return nResult;
}
int CTransaction::GetP2SHSigOpCount(const MapPrevTx& inputs) const
{
if (IsCoinBase())
return 0;
int nSigOps = 0;
for (int i = 0; i < vin.size(); i++)
{
const CTxOut& prevout = GetOutputFor(vin[i], inputs);
if (prevout.scriptPubKey.IsPayToScriptHash())
nSigOps += prevout.scriptPubKey.GetSigOpCount(vin[i].scriptSig);
}
return nSigOps;
}
bool CTransaction::ConnectInputs(MapPrevTx inputs,
map<uint256, CTxIndex>& mapTestPool, const CDiskTxPos& posThisTx,
const CBlockIndex* pindexBlock, bool fBlock, bool fMiner, bool fStrictPayToScriptHash)
{
// Take over previous transactions' spent pointers
// fBlock is true when this is called from AcceptBlock when a new best-block is added to the blockchain
// fMiner is true when called from the internal bitcoin miner
// ... both are false when called from CTransaction::AcceptToMemoryPool
if (!IsCoinBase())
{
int64 nValueIn = 0;
int64 nFees = 0;
for (int i = 0; i < vin.size(); i++)
{
COutPoint prevout = vin[i].prevout;
assert(inputs.count(prevout.hash) > 0);
CTxIndex& txindex = inputs[prevout.hash].first;
CTransaction& txPrev = inputs[prevout.hash].second;
if (prevout.n >= txPrev.vout.size() || prevout.n >= txindex.vSpent.size())
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()));
// If prev is coinbase, check that it's matured
if (txPrev.IsCoinBase())
for (const CBlockIndex* pindex = pindexBlock; pindex && pindexBlock->nHeight - pindex->nHeight < COINBASE_MATURITY; pindex = pindex->pprev)
if (pindex->nBlockPos == txindex.pos.nBlockPos && pindex->nFile == txindex.pos.nFile)
return error("ConnectInputs() : tried to spend coinbase at depth %d", pindexBlock->nHeight - pindex->nHeight);
// Check for conflicts (double-spend)
// This doesn't trigger the DoS code on purpose; if it did, it would make it easier
// for an attacker to attempt to split the network.
if (!txindex.vSpent[prevout.n].IsNull())
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());
// Check for negative or overflow input values
nValueIn += txPrev.vout[prevout.n].nValue;
if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
return DoS(100, error("ConnectInputs() : txin values out of range"));
// Skip ECDSA signature verification when connecting blocks (fBlock=true)
// before the last blockchain checkpoint. This is safe because block merkle hashes are
// still computed and checked, and any change will be caught at the next checkpoint.
if (!(fBlock && (nBestHeight < Checkpoints::GetTotalBlocksEstimate())))
{
// Verify signature
if (!VerifySignature(txPrev, *this, i, fStrictPayToScriptHash, 0))
{
// only during transition phase for P2SH: do not invoke anti-DoS code for
// potentially old clients relaying bad P2SH transactions
if (fStrictPayToScriptHash && VerifySignature(txPrev, *this, i, false, 0))
return error("ConnectInputs() : %s P2SH VerifySignature failed", GetHash().ToString().substr(0,10).c_str());
return DoS(100,error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str()));
}
}
// Mark outpoints as spent
txindex.vSpent[prevout.n] = posThisTx;
// Write back
if (fBlock || fMiner)
{
mapTestPool[prevout.hash] = txindex;
}
}
if (nValueIn < GetValueOut())
return DoS(100, error("ConnectInputs() : %s value in < value out", GetHash().ToString().substr(0,10).c_str()));
// Tally transaction fees
int64 nTxFee = nValueIn - GetValueOut();
if (nTxFee < 0)
return DoS(100, error("ConnectInputs() : %s nTxFee < 0", GetHash().ToString().substr(0,10).c_str()));
nFees += nTxFee;
if (!MoneyRange(nFees))
return DoS(100, error("ConnectInputs() : nFees out of range"));
}
return true;
}
bool CTransaction::ClientConnectInputs()
{
if (IsCoinBase())
return false;
// Take over previous transactions' spent pointers
CRITICAL_BLOCK(cs_mapTransactions)
{
int64 nValueIn = 0;
for (int i = 0; i < vin.size(); i++)
{
// Get prev tx from single transactions in memory
COutPoint prevout = vin[i].prevout;
if (!mapTransactions.count(prevout.hash))
return false;
CTransaction& txPrev = mapTransactions[prevout.hash];
if (prevout.n >= txPrev.vout.size())
return false;
// Verify signature
if (!VerifySignature(txPrev, *this, i, true, 0))
return error("ConnectInputs() : VerifySignature failed");
///// this is redundant with the mapNextTx stuff, not sure which I want to get rid of
///// this has to go away now that posNext is gone
// // Check for conflicts
// if (!txPrev.vout[prevout.n].posNext.IsNull())
// return error("ConnectInputs() : prev tx already used");
//
// // Flag outpoints as used
// txPrev.vout[prevout.n].posNext = posThisTx;
nValueIn += txPrev.vout[prevout.n].nValue;
if (!MoneyRange(txPrev.vout[prevout.n].nValue) || !MoneyRange(nValueIn))
return error("ClientConnectInputs() : txin values out of range");
}
if (GetValueOut() > nValueIn)
return false;
}
return true;
}
bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
{
// Disconnect in reverse order
for (int i = vtx.size()-1; i >= 0; i--)
if (!vtx[i].DisconnectInputs(txdb))
return false;
// Update block index on disk without changing it in memory.
// The memory index structure will be changed after the db commits.
if (pindex->pprev)
{
CDiskBlockIndex blockindexPrev(pindex->pprev);
blockindexPrev.hashNext = 0;
if (!txdb.WriteBlockIndex(blockindexPrev))
return error("DisconnectBlock() : WriteBlockIndex failed");
}
return true;
}
bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
{
// Check it again in case a previous version let a bad block in
if (!CheckBlock())
return false;
// Do not allow blocks that contain transactions which 'overwrite' older transactions,
// unless those are already completely spent.
// If such overwrites are allowed, coinbases and transactions depending upon those
// can be duplicated to remove the ability to spend the first instance -- even after
// being sent to another address.
// See BIP30 and http://r6.ca/blog/20120206T005236Z.html for more information.
// This logic is not necessary for memory pool transactions, as AcceptToMemoryPool
// already refuses previously-known transaction id's entirely.
// This rule applies to all blocks whose timestamp is after March 15, 2012, 0:00 UTC.
// On testnet it is enabled as of februari 20, 2012, 0:00 UTC.
if (pindex->nTime > 1331769600 || (fTestNet && pindex->nTime > 1329696000))
BOOST_FOREACH(CTransaction& tx, vtx)
{
CTxIndex txindexOld;
if (txdb.ReadTxIndex(tx.GetHash(), txindexOld))
BOOST_FOREACH(CDiskTxPos &pos, txindexOld.vSpent)
if (pos.IsNull())
return false;
}
// To avoid being on the short end of a block-chain split,
// don't do secondary validation of pay-to-script-hash transactions
// until blocks with timestamps after paytoscripthashtime (see init.cpp for default).
// This code can be removed once a super-majority of the network has upgraded.
int64 nEvalSwitchTime = GetArg("-paytoscripthashtime", std::numeric_limits<int64_t>::max());
bool fStrictPayToScriptHash = (pindex->nTime >= nEvalSwitchTime);
//// issue here: it doesn't know the version
unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK) - 1 + GetSizeOfCompactSize(vtx.size());
map<uint256, CTxIndex> mapQueuedChanges;
int64 nFees = 0;
int nSigOps = 0;
BOOST_FOREACH(CTransaction& tx, vtx)
{
nSigOps += tx.GetLegacySigOpCount();
if (nSigOps > MAX_BLOCK_SIGOPS)
return DoS(100, error("ConnectBlock() : too many sigops"));
CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
nTxPos += ::GetSerializeSize(tx, SER_DISK);
MapPrevTx mapInputs;
if (!tx.IsCoinBase())
{
bool fInvalid;
if (!tx.FetchInputs(txdb, mapQueuedChanges, true, false, mapInputs, fInvalid))
return false;
if (fStrictPayToScriptHash)
{
// Add in sigops done by pay-to-script-hash inputs;
// this is to prevent a "rogue miner" from creating
// an incredibly-expensive-to-validate block.
nSigOps += tx.GetP2SHSigOpCount(mapInputs);
if (nSigOps > MAX_BLOCK_SIGOPS)
return DoS(100, error("ConnectBlock() : too many sigops"));
}
nFees += tx.GetValueIn(mapInputs)-tx.GetValueOut();
if (!tx.ConnectInputs(mapInputs, mapQueuedChanges, posThisTx, pindex, true, false, fStrictPayToScriptHash))
return false;
}
mapQueuedChanges[tx.GetHash()] = CTxIndex(posThisTx, tx.vout.size());
}
// Write queued txindex changes
for (map<uint256, CTxIndex>::iterator mi = mapQueuedChanges.begin(); mi != mapQueuedChanges.end(); ++mi)
{
if (!txdb.UpdateTxIndex((*mi).first, (*mi).second))
return error("ConnectBlock() : UpdateTxIndex failed");
}
if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
return false;
// Update block index on disk without changing it in memory.
// The memory index structure will be changed after the db commits.
if (pindex->pprev)
{
CDiskBlockIndex blockindexPrev(pindex->pprev);
blockindexPrev.hashNext = pindex->GetBlockHash();
if (!txdb.WriteBlockIndex(blockindexPrev))
return error("ConnectBlock() : WriteBlockIndex failed");
}
// Watch for transactions paying to me
BOOST_FOREACH(CTransaction& tx, vtx)
SyncWithWallets(tx, this, true);
return true;
}
bool static Reorganize(CTxDB& txdb, CBlockIndex* pindexNew)
{
printf("REORGANIZE\n");
// Find the fork
CBlockIndex* pfork = pindexBest;
CBlockIndex* plonger = pindexNew;
while (pfork != plonger)
{
while (plonger->nHeight > pfork->nHeight)
if (!(plonger = plonger->pprev))
return error("Reorganize() : plonger->pprev is null");
if (pfork == plonger)
break;
if (!(pfork = pfork->pprev))
return error("Reorganize() : pfork->pprev is null");
}
// List of what to disconnect
vector<CBlockIndex*> vDisconnect;
for (CBlockIndex* pindex = pindexBest; pindex != pfork; pindex = pindex->pprev)
vDisconnect.push_back(pindex);
// List of what to connect
vector<CBlockIndex*> vConnect;
for (CBlockIndex* pindex = pindexNew; pindex != pfork; pindex = pindex->pprev)
vConnect.push_back(pindex);
reverse(vConnect.begin(), vConnect.end());
printf("REORGANIZE: Disconnect %i blocks; %s..%s\n", vDisconnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexBest->GetBlockHash().ToString().substr(0,20).c_str());
printf("REORGANIZE: Connect %i blocks; %s..%s\n", vConnect.size(), pfork->GetBlockHash().ToString().substr(0,20).c_str(), pindexNew->GetBlockHash().ToString().substr(0,20).c_str());
// Disconnect shorter branch
vector<CTransaction> vResurrect;
BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
{
CBlock block;
if (!block.ReadFromDisk(pindex))
return error("Reorganize() : ReadFromDisk for disconnect failed");
if (!block.DisconnectBlock(txdb, pindex))
return error("Reorganize() : DisconnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
// Queue memory transactions to resurrect
BOOST_FOREACH(const CTransaction& tx, block.vtx)
if (!tx.IsCoinBase())
vResurrect.push_back(tx);
}
// Connect longer branch
vector<CTransaction> vDelete;
for (int i = 0; i < vConnect.size(); i++)
{
CBlockIndex* pindex = vConnect[i];
CBlock block;
if (!block.ReadFromDisk(pindex))
return error("Reorganize() : ReadFromDisk for connect failed");
if (!block.ConnectBlock(txdb, pindex))
{
// Invalid block
txdb.TxnAbort();
return error("Reorganize() : ConnectBlock %s failed", pindex->GetBlockHash().ToString().substr(0,20).c_str());
}
// Queue memory transactions to delete
BOOST_FOREACH(const CTransaction& tx, block.vtx)
vDelete.push_back(tx);
}
if (!txdb.WriteHashBestChain(pindexNew->GetBlockHash()))
return error("Reorganize() : WriteHashBestChain failed");
// Make sure it's successfully written to disk before changing memory structure
if (!txdb.TxnCommit())
return error("Reorganize() : TxnCommit failed");
// Disconnect shorter branch
BOOST_FOREACH(CBlockIndex* pindex, vDisconnect)
if (pindex->pprev)
pindex->pprev->pnext = NULL;
// Connect longer branch
BOOST_FOREACH(CBlockIndex* pindex, vConnect)
if (pindex->pprev)
pindex->pprev->pnext = pindex;
// Resurrect memory transactions that were in the disconnected branch
BOOST_FOREACH(CTransaction& tx, vResurrect)
tx.AcceptToMemoryPool(txdb, false);
// Delete redundant memory transactions that are in the connected branch
BOOST_FOREACH(CTransaction& tx, vDelete)
tx.RemoveFromMemoryPool();
printf("REORGANIZE: done\n");
return true;
}
static void
runCommand(std::string strCommand)
{
int nErr = ::system(strCommand.c_str());
if (nErr)
printf("runCommand error: system(%s) returned %d\n", strCommand.c_str(), nErr);
}
// Called from inside SetBestChain: attaches a block to the new best chain being built
bool CBlock::SetBestChainInner(CTxDB& txdb, CBlockIndex *pindexNew)
{
uint256 hash = GetHash();
// Adding to current best branch
if (!ConnectBlock(txdb, pindexNew) || !txdb.WriteHashBestChain(hash))
{
txdb.TxnAbort();
InvalidChainFound(pindexNew);
return false;
}
if (!txdb.TxnCommit())
return error("SetBestChain() : TxnCommit failed");
// Add to current best branch
pindexNew->pprev->pnext = pindexNew;
// Delete redundant memory transactions
BOOST_FOREACH(CTransaction& tx, vtx)
tx.RemoveFromMemoryPool();
return true;
}
bool CBlock::SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew)
{
uint256 hash = GetHash();
txdb.TxnBegin();
if (pindexGenesisBlock == NULL && hash == hashGenesisBlock)
{
txdb.WriteHashBestChain(hash);
if (!txdb.TxnCommit())
return error("SetBestChain() : TxnCommit failed");
pindexGenesisBlock = pindexNew;
}
else if (hashPrevBlock == hashBestChain)
{
if (!SetBestChainInner(txdb, pindexNew))
return error("SetBestChain() : SetBestChainInner failed");
}
else
{
// the first block in the new chain that will cause it to become the new best chain
CBlockIndex *pindexIntermediate = pindexNew;
// list of blocks that need to be connected afterwards
std::vector<CBlockIndex*> vpindexSecondary;
// Reorganize is costly in terms of db load, as it works in a single db transaction.
// Try to limit how much needs to be done inside
while (pindexIntermediate->pprev && pindexIntermediate->pprev->bnChainWork > pindexBest->bnChainWork)
{
vpindexSecondary.push_back(pindexIntermediate);
pindexIntermediate = pindexIntermediate->pprev;
}
if (!vpindexSecondary.empty())
printf("Postponing %i reconnects\n", vpindexSecondary.size());
// Switch to new best branch
if (!Reorganize(txdb, pindexIntermediate))
{
txdb.TxnAbort();
InvalidChainFound(pindexNew);
return error("SetBestChain() : Reorganize failed");
}
// Connect futher blocks
BOOST_REVERSE_FOREACH(CBlockIndex *pindex, vpindexSecondary)
{
CBlock block;
if (!block.ReadFromDisk(pindex))
{
printf("SetBestChain() : ReadFromDisk failed\n");
break;
}
txdb.TxnBegin();
// errors now are not fatal, we still did a reorganisation to a new chain in a valid way
if (!block.SetBestChainInner(txdb, pindex))
break;
}
}
// Update best block in wallet (so we can detect restored wallets)
bool fIsInitialDownload = IsInitialBlockDownload();
if (!fIsInitialDownload)
{
const CBlockLocator locator(pindexNew);
::SetBestChain(locator);
}
// New best block
hashBestChain = hash;
pindexBest = pindexNew;
nBestHeight = pindexBest->nHeight;
bnBestChainWork = pindexNew->bnChainWork;
nTimeBestReceived = GetTime();
nTransactionsUpdated++;
printf("SetBestChain: new best=%s height=%d work=%s\n", hashBestChain.ToString().substr(0,20).c_str(), nBestHeight, bnBestChainWork.ToString().c_str());
std::string strCmd = GetArg("-blocknotify", "");
if (!fIsInitialDownload && !strCmd.empty())
{
boost::replace_all(strCmd, "%s", hashBestChain.GetHex());
boost::thread t(runCommand, strCmd); // thread runs free
}
return true;
}
bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
{
// Check for duplicate
uint256 hash = GetHash();
if (mapBlockIndex.count(hash))
return error("AddToBlockIndex() : %s already exists", hash.ToString().substr(0,20).c_str());
// Construct new block index object
CBlockIndex* pindexNew = new CBlockIndex(nFile, nBlockPos, *this);
if (!pindexNew)
return error("AddToBlockIndex() : new CBlockIndex failed");
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.insert(make_pair(hash, pindexNew)).first;
pindexNew->phashBlock = &((*mi).first);
map<uint256, CBlockIndex*>::iterator miPrev = mapBlockIndex.find(hashPrevBlock);
if (miPrev != mapBlockIndex.end())
{
pindexNew->pprev = (*miPrev).second;
pindexNew->nHeight = pindexNew->pprev->nHeight + 1;
}
pindexNew->bnChainWork = (pindexNew->pprev ? pindexNew->pprev->bnChainWork : 0) + pindexNew->GetBlockWork();
CTxDB txdb;
txdb.TxnBegin();
txdb.WriteBlockIndex(CDiskBlockIndex(pindexNew));
if (!txdb.TxnCommit())
return false;
// New best
if (pindexNew->bnChainWork > bnBestChainWork)
if (!SetBestChain(txdb, pindexNew))
return false;
txdb.Close();
if (pindexNew == pindexBest)
{
// Notify UI to display prev block's coinbase if it was ours
static uint256 hashPrevBestCoinBase;
UpdatedTransaction(hashPrevBestCoinBase);
hashPrevBestCoinBase = vtx[0].GetHash();
}
MainFrameRepaint();
return true;
}
bool CBlock::CheckBlock() const
{
// These are checks that are independent of context
// that can be verified before saving an orphan block.
// Size limits
if (vtx.empty() || vtx.size() > MAX_BLOCK_SIZE || ::GetSerializeSize(*this, SER_NETWORK) > MAX_BLOCK_SIZE)
return DoS(100, error("CheckBlock() : size limits failed"));
// Check proof of work matches claimed amount
if (!CheckProofOfWork(GetHash(), nBits))
return DoS(50, error("CheckBlock() : proof of work failed"));
// Check timestamp
if (GetBlockTime() > GetAdjustedTime() + 2 * 60 * 60)
return error("CheckBlock() : block timestamp too far in the future");
// First transaction must be coinbase, the rest must not be
if (vtx.empty() || !vtx[0].IsCoinBase())
return DoS(100, error("CheckBlock() : first tx is not coinbase"));
for (int i = 1; i < vtx.size(); i++)
if (vtx[i].IsCoinBase())
return DoS(100, error("CheckBlock() : more than one coinbase"));
// Check transactions
BOOST_FOREACH(const CTransaction& tx, vtx)
if (!tx.CheckTransaction())
return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed"));
int nSigOps = 0;
BOOST_FOREACH(const CTransaction& tx, vtx)
{
nSigOps += tx.GetLegacySigOpCount();
}
if (nSigOps > MAX_BLOCK_SIGOPS)
return DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"));
// Check merkleroot
if (hashMerkleRoot != BuildMerkleTree())
return DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
return true;
}
bool CBlock::AcceptBlock()
{
// Check for duplicate
uint256 hash = GetHash();
if (mapBlockIndex.count(hash))
return error("AcceptBlock() : block already in mapBlockIndex");
// Get prev block index
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashPrevBlock);
if (mi == mapBlockIndex.end())
return DoS(10, error("AcceptBlock() : prev block not found"));
CBlockIndex* pindexPrev = (*mi).second;
int nHeight = pindexPrev->nHeight+1;
// Check proof of work
if (nBits != GetNextWorkRequired(pindexPrev, this))
return DoS(100, error("AcceptBlock() : incorrect proof of work"));
// Check timestamp against prev
if (GetBlockTime() <= pindexPrev->GetMedianTimePast())
return error("AcceptBlock() : block's timestamp is too early");
// Check that all transactions are finalized
BOOST_FOREACH(const CTransaction& tx, vtx)
if (!tx.IsFinal(nHeight, GetBlockTime()))
return DoS(10, error("AcceptBlock() : contains a non-final transaction"));
// Check that the block chain matches the known block chain up to a checkpoint
if (!Checkpoints::CheckBlock(nHeight, hash))
return DoS(100, error("AcceptBlock() : rejected by checkpoint lockin at %d", nHeight));
// Write block to history file
if (!CheckDiskSpace(::GetSerializeSize(*this, SER_DISK)))
return error("AcceptBlock() : out of disk space");
unsigned int nFile = -1;
unsigned int nBlockPos = 0;
if (!WriteToDisk(nFile, nBlockPos))
return error("AcceptBlock() : WriteToDisk failed");
if (!AddToBlockIndex(nFile, nBlockPos))
return error("AcceptBlock() : AddToBlockIndex failed");
// Relay inventory, but don't relay old inventory during initial block download
int nBlockEstimate = Checkpoints::GetTotalBlocksEstimate();
if (hashBestChain == hash)
CRITICAL_BLOCK(cs_vNodes)
BOOST_FOREACH(CNode* pnode, vNodes)
if (nBestHeight > (pnode->nStartingHeight != -1 ? pnode->nStartingHeight - 2000 : nBlockEstimate))
pnode->PushInventory(CInv(MSG_BLOCK, hash));
return true;
}
bool ProcessBlock(CNode* pfrom, CBlock* pblock)
{
// Check for duplicate
uint256 hash = pblock->GetHash();
if (mapBlockIndex.count(hash))
return error("ProcessBlock() : already have block %d %s", mapBlockIndex[hash]->nHeight, hash.ToString().substr(0,20).c_str());
if (mapOrphanBlocks.count(hash))
return error("ProcessBlock() : already have block (orphan) %s", hash.ToString().substr(0,20).c_str());
// Preliminary checks
if (!pblock->CheckBlock())
return error("ProcessBlock() : CheckBlock FAILED");
CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(mapBlockIndex);
if (pcheckpoint && pblock->hashPrevBlock != hashBestChain)
{
// Extra checks to prevent "fill up memory by spamming with bogus blocks"
int64 deltaTime = pblock->GetBlockTime() - pcheckpoint->nTime;
if (deltaTime < 0)
{
if (pfrom)
pfrom->Misbehaving(100);
return error("ProcessBlock() : block with timestamp before last checkpoint");
}
CBigNum bnNewBlock;
bnNewBlock.SetCompact(pblock->nBits);
CBigNum bnRequired;
bnRequired.SetCompact(ComputeMinWork(pcheckpoint->nBits, deltaTime));
if (bnNewBlock > bnRequired)
{
if (pfrom)
pfrom->Misbehaving(100);
return error("ProcessBlock() : block with too little proof-of-work");
}
}
// If don't already have its previous block, shunt it off to holding area until we get it
if (!mapBlockIndex.count(pblock->hashPrevBlock))
{
printf("ProcessBlock: ORPHAN BLOCK, prev=%s\n", pblock->hashPrevBlock.ToString().substr(0,20).c_str());
CBlock* pblock2 = new CBlock(*pblock);
mapOrphanBlocks.insert(make_pair(hash, pblock2));
mapOrphanBlocksByPrev.insert(make_pair(pblock2->hashPrevBlock, pblock2));
// Ask this guy to fill in what we're missing
if (pfrom)
pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(pblock2));
return true;
}
// Store to disk
if (!pblock->AcceptBlock())
return error("ProcessBlock() : AcceptBlock FAILED");
// Recursively process any orphan blocks that depended on this one
vector<uint256> vWorkQueue;
vWorkQueue.push_back(hash);
for (int i = 0; i < vWorkQueue.size(); i++)
{
uint256 hashPrev = vWorkQueue[i];
for (multimap<uint256, CBlock*>::iterator mi = mapOrphanBlocksByPrev.lower_bound(hashPrev);
mi != mapOrphanBlocksByPrev.upper_bound(hashPrev);
++mi)
{
CBlock* pblockOrphan = (*mi).second;
if (pblockOrphan->AcceptBlock())
vWorkQueue.push_back(pblockOrphan->GetHash());
mapOrphanBlocks.erase(pblockOrphan->GetHash());
delete pblockOrphan;
}
mapOrphanBlocksByPrev.erase(hashPrev);
}
printf("ProcessBlock: ACCEPTED\n");
return true;
}
bool CheckDiskSpace(uint64 nAdditionalBytes)
{
uint64 nFreeBytesAvailable = filesystem::space(GetDataDir()).available;
// Check for 15MB because database could create another 10MB log file at any time
if (nFreeBytesAvailable < (uint64)15000000 + nAdditionalBytes)
{
fShutdown = true;
string strMessage = _("Warning: Disk space is low ");
strMiscWarning = strMessage;
printf("*** %s\n", strMessage.c_str());
ThreadSafeMessageBox(strMessage, "Bitcoin", wxOK | wxICON_EXCLAMATION);
CreateThread(Shutdown, NULL);
return false;
}
return true;
}
FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode)
{
if (nFile == -1)
return NULL;
FILE* file = fopen(strprintf("%s/blk%04d.dat", GetDataDir().c_str(), nFile).c_str(), pszMode);
if (!file)
return NULL;
if (nBlockPos != 0 && !strchr(pszMode, 'a') && !strchr(pszMode, 'w'))
{
if (fseek(file, nBlockPos, SEEK_SET) != 0)
{
fclose(file);
return NULL;
}
}
return file;
}
static unsigned int nCurrentBlockFile = 1;
FILE* AppendBlockFile(unsigned int& nFileRet)
{
nFileRet = 0;
loop
{
FILE* file = OpenBlockFile(nCurrentBlockFile, 0, "ab");
if (!file)
return NULL;
if (fseek(file, 0, SEEK_END) != 0)
return NULL;
// FAT32 filesize max 4GB, fseek and ftell max 2GB, so we must stay under 2GB
if (ftell(file) < 0x7F000000 - MAX_SIZE)
{
nFileRet = nCurrentBlockFile;
return file;
}
fclose(file);
nCurrentBlockFile++;
}
}
bool LoadBlockIndex(bool fAllowNew)
{
if (fTestNet)
{
hashGenesisBlock = uint256("0x00000007199508e34a9ff81e6ec0c477a4cccff2a4767a8eee39c11db367b008");
bnProofOfWorkLimit = CBigNum(~uint256(0) >> 28);
pchMessageStart[0] = 0xfa;
pchMessageStart[1] = 0xbf;
pchMessageStart[2] = 0xb5;
pchMessageStart[3] = 0xda;
}
//
// Load block index
//
CTxDB txdb("cr");
if (!txdb.LoadBlockIndex())
return false;
txdb.Close();
//
// Init with genesis block
//
if (mapBlockIndex.empty())
{
if (!fAllowNew)
return false;
// Genesis Block:
// CBlock(hash=000000000019d6, ver=1, hashPrevBlock=00000000000000, hashMerkleRoot=4a5e1e, nTime=1231006505, nBits=1d00ffff, nNonce=2083236893, vtx=1)
// CTransaction(hash=4a5e1e, ver=1, vin.size=1, vout.size=1, nLockTime=0)
// CTxIn(COutPoint(000000, -1), coinbase 04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73)
// CTxOut(nValue=50.00000000, scriptPubKey=0x5F1DF16B2B704C8A578D0B)
// vMerkleTree: 4a5e1e
// Genesis block
const char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
CTransaction txNew;
txNew.vin.resize(1);
txNew.vout.resize(1);
txNew.vin[0].scriptSig = CScript() << 486604799 << CBigNum(4) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
txNew.vout[0].nValue = 50 * COIN;
txNew.vout[0].scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
CBlock block;
block.vtx.push_back(txNew);
block.hashPrevBlock = 0;
block.hashMerkleRoot = block.BuildMerkleTree();
block.nVersion = 1;
block.nTime = 1231006505;
block.nBits = 0x1d00ffff;
block.nNonce = 2083236893;
if (fTestNet)
{
block.nTime = 1296688602;
block.nBits = 0x1d07fff8;
block.nNonce = 384568319;
}
//// debug print
printf("%s\n", block.GetHash().ToString().c_str());
printf("%s\n", hashGenesisBlock.ToString().c_str());
printf("%s\n", block.hashMerkleRoot.ToString().c_str());
assert(block.hashMerkleRoot == uint256("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b"));
block.print();
assert(block.GetHash() == hashGenesisBlock);
// Start new block file
unsigned int nFile;
unsigned int nBlockPos;
if (!block.WriteToDisk(nFile, nBlockPos))
return error("LoadBlockIndex() : writing genesis block to disk failed");
if (!block.AddToBlockIndex(nFile, nBlockPos))
return error("LoadBlockIndex() : genesis block not accepted");
}
return true;
}
void PrintBlockTree()
{
// precompute tree structure
map<CBlockIndex*, vector<CBlockIndex*> > mapNext;
for (map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.begin(); mi != mapBlockIndex.end(); ++mi)
{
CBlockIndex* pindex = (*mi).second;
mapNext[pindex->pprev].push_back(pindex);
// test
//while (rand() % 3 == 0)
// mapNext[pindex->pprev].push_back(pindex);
}
vector<pair<int, CBlockIndex*> > vStack;
vStack.push_back(make_pair(0, pindexGenesisBlock));
int nPrevCol = 0;
while (!vStack.empty())
{
int nCol = vStack.back().first;
CBlockIndex* pindex = vStack.back().second;
vStack.pop_back();
// print split or gap
if (nCol > nPrevCol)
{
for (int i = 0; i < nCol-1; i++)
printf("| ");
printf("|\\\n");
}
else if (nCol < nPrevCol)
{
for (int i = 0; i < nCol; i++)
printf("| ");
printf("|\n");
}
nPrevCol = nCol;
// print columns
for (int i = 0; i < nCol; i++)
printf("| ");
// print item
CBlock block;
block.ReadFromDisk(pindex);
printf("%d (%u,%u) %s %s tx %d",
pindex->nHeight,
pindex->nFile,
pindex->nBlockPos,
block.GetHash().ToString().substr(0,20).c_str(),
DateTimeStrFormat("%x %H:%M:%S", block.GetBlockTime()).c_str(),
block.vtx.size());
PrintWallets(block);
// put the main timechain first
vector<CBlockIndex*>& vNext = mapNext[pindex];
for (int i = 0; i < vNext.size(); i++)
{
if (vNext[i]->pnext)
{
swap(vNext[0], vNext[i]);
break;
}
}
// iterate children
for (int i = 0; i < vNext.size(); i++)
vStack.push_back(make_pair(nCol+i, vNext[i]));
}
}
//////////////////////////////////////////////////////////////////////////////
//
// CAlert
//
map<uint256, CAlert> mapAlerts;
CCriticalSection cs_mapAlerts;
string GetWarnings(string strFor)
{
int nPriority = 0;
string strStatusBar;
string strRPC;
if (GetBoolArg("-testsafemode"))
strRPC = "test";
// Misc warnings like out of disk space and clock is wrong
if (strMiscWarning != "")
{
nPriority = 1000;
strStatusBar = strMiscWarning;
}
// Longer invalid proof-of-work chain
if (pindexBest && bnBestInvalidWork > bnBestChainWork + pindexBest->GetBlockWork() * 6)
{
nPriority = 2000;
strStatusBar = strRPC = "WARNING: Displayed transactions may not be correct! You may need to upgrade, or other nodes may need to upgrade.";
}
// Alerts
CRITICAL_BLOCK(cs_mapAlerts)
{
BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
{
const CAlert& alert = item.second;
if (alert.AppliesToMe() && alert.nPriority > nPriority)
{
nPriority = alert.nPriority;
strStatusBar = alert.strStatusBar;
}
}
}
if (strFor == "statusbar")
return strStatusBar;
else if (strFor == "rpc")
return strRPC;
assert(!"GetWarnings() : invalid parameter");
return "error";
}
bool CAlert::ProcessAlert()
{
if (!CheckSignature())
return false;
if (!IsInEffect())
return false;
CRITICAL_BLOCK(cs_mapAlerts)
{
// Cancel previous alerts
for (map<uint256, CAlert>::iterator mi = mapAlerts.begin(); mi != mapAlerts.end();)
{
const CAlert& alert = (*mi).second;
if (Cancels(alert))
{
printf("cancelling alert %d\n", alert.nID);
mapAlerts.erase(mi++);
}
else if (!alert.IsInEffect())
{
printf("expiring alert %d\n", alert.nID);
mapAlerts.erase(mi++);
}
else
mi++;
}
// Check if this alert has been cancelled
BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
{
const CAlert& alert = item.second;
if (alert.Cancels(*this))
{
printf("alert already cancelled by %d\n", alert.nID);
return false;
}
}
// Add to mapAlerts
mapAlerts.insert(make_pair(GetHash(), *this));
}
printf("accepted alert %d, AppliesToMe()=%d\n", nID, AppliesToMe());
MainFrameRepaint();
return true;
}
//////////////////////////////////////////////////////////////////////////////
//
// Messages
//
bool static AlreadyHave(CTxDB& txdb, const CInv& inv)
{
switch (inv.type)
{
case MSG_TX: return mapTransactions.count(inv.hash) || mapOrphanTransactions.count(inv.hash) || txdb.ContainsTx(inv.hash);
case MSG_BLOCK: return mapBlockIndex.count(inv.hash) || mapOrphanBlocks.count(inv.hash);
}
// Don't know what it is, just say we already got one
return true;
}
// The message start string is designed to be unlikely to occur in normal data.
// The characters are rarely used upper ascii, not valid as UTF-8, and produce
// a large 4-byte int at any alignment.
unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
{
static map<CService, vector<unsigned char> > mapReuseKey;
RandAddSeedPerfmon();
if (fDebug) {
printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str());
printf("received: %s (%d bytes)\n", strCommand.c_str(), vRecv.size());
}
if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0)
{
printf("dropmessagestest DROPPING RECV MESSAGE\n");
return true;
}
if (strCommand == "version")
{
// Each connection can only send one version message
if (pfrom->nVersion != 0)
{
pfrom->Misbehaving(1);
return false;
}
int64 nTime;
CAddress addrMe;
CAddress addrFrom;
uint64 nNonce = 1;
vRecv >> pfrom->nVersion >> pfrom->nServices >> nTime >> addrMe;
if (pfrom->nVersion < 209)
{
// Since February 20, 2012, the protocol is initiated at version 209,
// and earlier versions are no longer supported
printf("partner %s using obsolete version %i; disconnecting\n", pfrom->addr.ToString().c_str(), pfrom->nVersion);
pfrom->fDisconnect = true;
return false;
}
if (pfrom->nVersion == 10300)
pfrom->nVersion = 300;
if (!vRecv.empty())
vRecv >> addrFrom >> nNonce;
if (!vRecv.empty())
vRecv >> pfrom->strSubVer;
if (!vRecv.empty())
vRecv >> pfrom->nStartingHeight;
// Disconnect if we connected to ourself
if (nNonce == nLocalHostNonce && nNonce > 1)
{
printf("connected to self at %s, disconnecting\n", pfrom->addr.ToString().c_str());
pfrom->fDisconnect = true;
return true;
}
// Be shy and don't send version until we hear
if (pfrom->fInbound)
pfrom->PushVersion();
pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
AddTimeData(pfrom->addr, nTime);
// Change version
pfrom->PushMessage("verack");
pfrom->vSend.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
if (!pfrom->fInbound)
{
// Advertise our address
if (!fNoListen && !fUseProxy && addrLocalHost.IsRoutable() &&
!IsInitialBlockDownload())
{
CAddress addr(addrLocalHost);
addr.nTime = GetAdjustedTime();
pfrom->PushAddress(addr);
}
// Get recent addresses
if (pfrom->nVersion >= 31402 || mapAddresses.size() < 1000)
{
pfrom->PushMessage("getaddr");
pfrom->fGetAddr = true;
}
}
// Ask the first connected node for block updates
static int nAskedForBlocks = 0;
if (!pfrom->fClient &&
(pfrom->nVersion < 32000 || pfrom->nVersion >= 32400) &&
(nAskedForBlocks < 1 || vNodes.size() <= 1))
{
nAskedForBlocks++;
pfrom->PushGetBlocks(pindexBest, uint256(0));
}
// Relay alerts
CRITICAL_BLOCK(cs_mapAlerts)
BOOST_FOREACH(PAIRTYPE(const uint256, CAlert)& item, mapAlerts)
item.second.RelayTo(pfrom);
pfrom->fSuccessfullyConnected = true;
printf("version message: version %d, blocks=%d\n", pfrom->nVersion, pfrom->nStartingHeight);
cPeerBlockCounts.input(pfrom->nStartingHeight);
}
else if (pfrom->nVersion == 0)
{
// Must have a version message before anything else
pfrom->Misbehaving(1);
return false;
}
else if (strCommand == "verack")
{
pfrom->vRecv.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
}
else if (strCommand == "addr")
{
vector<CAddress> vAddr;
vRecv >> vAddr;
// Don't want addr from older versions unless seeding
if (pfrom->nVersion < 31402 && mapAddresses.size() > 1000)
return true;
if (vAddr.size() > 1000)
{
pfrom->Misbehaving(20);
return error("message addr size() = %d", vAddr.size());
}
// Store the new addresses
CAddrDB addrDB;
addrDB.TxnBegin();
int64 nNow = GetAdjustedTime();
int64 nSince = nNow - 10 * 60;
BOOST_FOREACH(CAddress& addr, vAddr)
{
if (fShutdown)
return true;
// ignore IPv6 for now, since it isn't implemented anyway
if (!addr.IsIPv4())
continue;
if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
addr.nTime = nNow - 5 * 24 * 60 * 60;
AddAddress(addr, 2 * 60 * 60, &addrDB);
pfrom->AddAddressKnown(addr);
if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
{
// Relay to a limited number of other nodes
CRITICAL_BLOCK(cs_vNodes)
{
// Use deterministic randomness to send to the same nodes for 24 hours
// at a time so the setAddrKnowns of the chosen nodes prevent repeats
static uint256 hashSalt;
if (hashSalt == 0)
RAND_bytes((unsigned char*)&hashSalt, sizeof(hashSalt));
int64 hashAddr = addr.GetHash();
uint256 hashRand = hashSalt ^ (hashAddr<<32) ^ ((GetTime()+hashAddr)/(24*60*60));
hashRand = Hash(BEGIN(hashRand), END(hashRand));
multimap<uint256, CNode*> mapMix;
BOOST_FOREACH(CNode* pnode, vNodes)
{
if (pnode->nVersion < 31402)
continue;
unsigned int nPointer;
memcpy(&nPointer, &pnode, sizeof(nPointer));
uint256 hashKey = hashRand ^ nPointer;
hashKey = Hash(BEGIN(hashKey), END(hashKey));
mapMix.insert(make_pair(hashKey, pnode));
}
int nRelayNodes = 2;
for (multimap<uint256, CNode*>::iterator mi = mapMix.begin(); mi != mapMix.end() && nRelayNodes-- > 0; ++mi)
((*mi).second)->PushAddress(addr);
}
}
}
addrDB.TxnCommit(); // Save addresses (it's ok if this fails)
if (vAddr.size() < 1000)
pfrom->fGetAddr = false;
}
else if (strCommand == "inv")
{
vector<CInv> vInv;
vRecv >> vInv;
if (vInv.size() > 50000)
{
pfrom->Misbehaving(20);
return error("message inv size() = %d", vInv.size());
}
CTxDB txdb("r");
BOOST_FOREACH(const CInv& inv, vInv)
{
if (fShutdown)
return true;
pfrom->AddInventoryKnown(inv);
bool fAlreadyHave = AlreadyHave(txdb, inv);
if (fDebug)
printf(" got inventory: %s %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new");
if (!fAlreadyHave)
pfrom->AskFor(inv);
else if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash))
pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(mapOrphanBlocks[inv.hash]));
// Track requests for our stuff
Inventory(inv.hash);
}
}
else if (strCommand == "getdata")
{
vector<CInv> vInv;
vRecv >> vInv;
if (vInv.size() > 50000)
{
pfrom->Misbehaving(20);
return error("message getdata size() = %d", vInv.size());
}
BOOST_FOREACH(const CInv& inv, vInv)
{
if (fShutdown)
return true;
printf("received getdata for: %s\n", inv.ToString().c_str());
if (inv.type == MSG_BLOCK)
{
// Send block from disk
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(inv.hash);
if (mi != mapBlockIndex.end())
{
CBlock block;
block.ReadFromDisk((*mi).second);
pfrom->PushMessage("block", block);
// Trigger them to send a getblocks request for the next batch of inventory
if (inv.hash == pfrom->hashContinue)
{
// Bypass PushInventory, this must send even if redundant,
// and we want it right after the last block so they don't
// wait for other stuff first.
vector<CInv> vInv;
vInv.push_back(CInv(MSG_BLOCK, hashBestChain));
pfrom->PushMessage("inv", vInv);
pfrom->hashContinue = 0;
}
}
}
else if (inv.IsKnownType())
{
// Send stream from relay memory
CRITICAL_BLOCK(cs_mapRelay)
{
map<CInv, CDataStream>::iterator mi = mapRelay.find(inv);
if (mi != mapRelay.end())
pfrom->PushMessage(inv.GetCommand(), (*mi).second);
}
}
// Track requests for our stuff
Inventory(inv.hash);
}
}
else if (strCommand == "getblocks")
{
CBlockLocator locator;
uint256 hashStop;
vRecv >> locator >> hashStop;
// Find the last block the caller has in the main chain
CBlockIndex* pindex = locator.GetBlockIndex();
// Send the rest of the chain
if (pindex)
pindex = pindex->pnext;
int nLimit = 500 + locator.GetDistanceBack();
unsigned int nBytes = 0;
printf("getblocks %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
for (; pindex; pindex = pindex->pnext)
{
if (pindex->GetBlockHash() == hashStop)
{
printf(" getblocks stopping at %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
break;
}
pfrom->PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash()));
CBlock block;
block.ReadFromDisk(pindex, true);
nBytes += block.GetSerializeSize(SER_NETWORK);
if (--nLimit <= 0 || nBytes >= SendBufferSize()/2)
{
// When this block is requested, we'll send an inv that'll make them
// getblocks the next batch of inventory.
printf(" getblocks stopping at limit %d %s (%u bytes)\n", pindex->nHeight, pindex->GetBlockHash().ToString().substr(0,20).c_str(), nBytes);
pfrom->hashContinue = pindex->GetBlockHash();
break;
}
}
}
else if (strCommand == "getheaders")
{
CBlockLocator locator;
uint256 hashStop;
vRecv >> locator >> hashStop;
CBlockIndex* pindex = NULL;
if (locator.IsNull())
{
// If locator is null, return the hashStop block
map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashStop);
if (mi == mapBlockIndex.end())
return true;
pindex = (*mi).second;
}
else
{
// Find the last block the caller has in the main chain
pindex = locator.GetBlockIndex();
if (pindex)
pindex = pindex->pnext;
}
vector<CBlock> vHeaders;
int nLimit = 2000 + locator.GetDistanceBack();
printf("getheaders %d to %s limit %d\n", (pindex ? pindex->nHeight : -1), hashStop.ToString().substr(0,20).c_str(), nLimit);
for (; pindex; pindex = pindex->pnext)
{
vHeaders.push_back(pindex->GetBlockHeader());
if (--nLimit <= 0 || pindex->GetBlockHash() == hashStop)
break;
}
pfrom->PushMessage("headers", vHeaders);
}
else if (strCommand == "tx")
{
vector<uint256> vWorkQueue;
CDataStream vMsg(vRecv);
CTransaction tx;
vRecv >> tx;
CInv inv(MSG_TX, tx.GetHash());
pfrom->AddInventoryKnown(inv);
bool fMissingInputs = false;
if (tx.AcceptToMemoryPool(true, &fMissingInputs))
{
SyncWithWallets(tx, NULL, true);
RelayMessage(inv, vMsg);
mapAlreadyAskedFor.erase(inv);
vWorkQueue.push_back(inv.hash);
// Recursively process any orphan transactions that depended on this one
for (int i = 0; i < vWorkQueue.size(); i++)
{
uint256 hashPrev = vWorkQueue[i];
for (multimap<uint256, CDataStream*>::iterator mi = mapOrphanTransactionsByPrev.lower_bound(hashPrev);
mi != mapOrphanTransactionsByPrev.upper_bound(hashPrev);
++mi)
{
const CDataStream& vMsg = *((*mi).second);
CTransaction tx;
CDataStream(vMsg) >> tx;
CInv inv(MSG_TX, tx.GetHash());
if (tx.AcceptToMemoryPool(true))
{
printf(" accepted orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
SyncWithWallets(tx, NULL, true);
RelayMessage(inv, vMsg);
mapAlreadyAskedFor.erase(inv);
vWorkQueue.push_back(inv.hash);
}
}
}
BOOST_FOREACH(uint256 hash, vWorkQueue)
EraseOrphanTx(hash);
}
else if (fMissingInputs)
{
printf("storing orphan tx %s\n", inv.hash.ToString().substr(0,10).c_str());
AddOrphanTx(vMsg);
// DoS prevention: do not allow mapOrphanTransactions to grow unbounded
int nEvicted = LimitOrphanTxSize(MAX_ORPHAN_TRANSACTIONS);
if (nEvicted > 0)
printf("mapOrphan overflow, removed %d tx\n", nEvicted);
}
if (tx.nDoS) pfrom->Misbehaving(tx.nDoS);
}
else if (strCommand == "block")
{
CBlock block;
vRecv >> block;
printf("received block %s\n", block.GetHash().ToString().substr(0,20).c_str());
// block.print();
CInv inv(MSG_BLOCK, block.GetHash());
pfrom->AddInventoryKnown(inv);
if (ProcessBlock(pfrom, &block))
mapAlreadyAskedFor.erase(inv);
if (block.nDoS) pfrom->Misbehaving(block.nDoS);
}
else if (strCommand == "getaddr")
{
// Nodes rebroadcast an addr every 24 hours
pfrom->vAddrToSend.clear();
int64 nSince = GetAdjustedTime() - 3 * 60 * 60; // in the last 3 hours
CRITICAL_BLOCK(cs_mapAddresses)
{
unsigned int nCount = 0;
BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
{
const CAddress& addr = item.second;
if (addr.nTime > nSince)
nCount++;
}
BOOST_FOREACH(const PAIRTYPE(vector<unsigned char>, CAddress)& item, mapAddresses)
{
const CAddress& addr = item.second;
if (addr.nTime > nSince && GetRand(nCount) < 2500)
pfrom->PushAddress(addr);
}
}
}
else if (strCommand == "checkorder")
{
uint256 hashReply;
vRecv >> hashReply;
if (!GetBoolArg("-allowreceivebyip"))