sikkienl/dash
1
0
Fork 0
mirror of https://github.com/dashpay/dash.git synced 2024-12-27 21:12:48 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

CreateNewBlock: Check that the produced CBlock is acceptable (except for proof-of-work and merkletree, since those need to be provided later)

Browse Source 
This throws an exception from CreateNewBlock otherwise, which is not safe without #1245!
This commit is contained in:
Luke Dashjr 2012-05-09 17:24:44 +00:00
parent a1c3d8f14d
commit 3cd01fdf0e
2 changed files with 33 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
src/main.cpp
View File

@ -1252,10 +1252,10 @@ bool CBlock::DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex)
return true;
}
bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex, bool fJustCheck)
{
// Check it again in case a previous version let a bad block in
if (!CheckBlock())
if (!CheckBlock(!fJustCheck, !fJustCheck))
return false;
// Do not allow blocks that contain transactions which 'overwrite' older transactions,
@ -1283,7 +1283,13 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
bool fStrictPayToScriptHash = (pindex->nTime >= nBIP16SwitchTime);
//// issue here: it doesn't know the version
unsigned int nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK) - 1 + GetSizeOfCompactSize(vtx.size());
unsigned int nTxPos;
if (fJustCheck)
// FetchInputs treats CDiskTxPos(1,1,1) as a special "refer to memorypool" indicator
// Since we're just checking the block and not actually connecting it, it might not (and probably shouldn't) be on the disk to get the transaction from
nTxPos = 1;
else
nTxPos = pindex->nBlockPos + ::GetSerializeSize(CBlock(), SER_DISK) - 1 + GetSizeOfCompactSize(vtx.size());
map<uint256, CTxIndex> mapQueuedChanges;
int64 nFees = 0;
@ -1295,7 +1301,8 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
return DoS(100, error("ConnectBlock() : too many sigops"));
CDiskTxPos posThisTx(pindex->nFile, pindex->nBlockPos, nTxPos);
nTxPos += ::GetSerializeSize(tx, SER_DISK);
if (!fJustCheck)
nTxPos += ::GetSerializeSize(tx, SER_DISK);
MapPrevTx mapInputs;
if (!tx.IsCoinBase())
@ -1323,6 +1330,12 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
mapQueuedChanges[tx.GetHash()] = CTxIndex(posThisTx, tx.vout.size());
}
if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
return false;
if (fJustCheck)
return true;
// Write queued txindex changes
for (map<uint256, CTxIndex>::iterator mi = mapQueuedChanges.begin(); mi != mapQueuedChanges.end(); ++mi)
{
@ -1330,9 +1343,6 @@ bool CBlock::ConnectBlock(CTxDB& txdb, CBlockIndex* pindex)
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)
@ -1619,7 +1629,7 @@ bool CBlock::AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos)
bool CBlock::CheckBlock() const
bool CBlock::CheckBlock(bool fCheckPOW, bool fCheckMerkleRoot) const
{
// These are checks that are independent of context
// that can be verified before saving an orphan block.
@ -1629,7 +1639,7 @@ bool CBlock::CheckBlock() const
return DoS(100, error("CheckBlock() : size limits failed"));
// Check proof of work matches claimed amount
if (!CheckProofOfWork(GetHash(), nBits))
if (fCheckPOW && !CheckProofOfWork(GetHash(), nBits))
return DoS(50, error("CheckBlock() : proof of work failed"));
// Check timestamp
@ -1657,7 +1667,7 @@ bool CBlock::CheckBlock() const
return DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"));
// Check merkleroot
if (hashMerkleRoot != BuildMerkleTree())
if (fCheckMerkleRoot && hashMerkleRoot != BuildMerkleTree())
return DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"));
return true;
@ -3066,6 +3076,9 @@ public:
uint64 nLastBlockTx = 0;
uint64 nLastBlockSize = 0;
const char* pszDummy = "\0\0";
CScript scriptDummy(std::vector<unsigned char>(pszDummy, pszDummy + sizeof(pszDummy)));
CBlock* CreateNewBlock(CReserveKey& reservekey)
{
CBlockIndex* pindexPrev = pindexBest;
@ -3224,16 +3237,22 @@ CBlock* CreateNewBlock(CReserveKey& reservekey)
nLastBlockSize = nBlockSize;
printf("CreateNewBlock(): total size %lu\n", nBlockSize);
}
pblock->vtx[0].vout[0].nValue = GetBlockValue(pindexPrev->nHeight+1, nFees);
// Fill in header
pblock->hashPrevBlock = pindexPrev->GetBlockHash();
pblock->hashMerkleRoot = pblock->BuildMerkleTree();
pblock->UpdateTime(pindexPrev);
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock.get());
pblock->nNonce = 0;
pblock->vtx[0].vin[0].scriptSig = scriptDummy;
CBlockIndex indexDummy(1, 1, *pblock);
indexDummy.pprev = pindexPrev;
indexDummy.nHeight = pindexPrev->nHeight + 1;
if (!pblock->ConnectBlock(txdb, &indexDummy, true))
throw std::runtime_error("CreateNewBlock() : ConnectBlock failed");
}
return pblock.release();
}

4
src/main.h
View File

@ -1017,11 +1017,11 @@ public:
bool DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex);
bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex);
bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex, bool fJustCheck=false);
bool ReadFromDisk(const CBlockIndex* pindex, bool fReadTransactions=true);
bool SetBestChain(CTxDB& txdb, CBlockIndex* pindexNew);
bool AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos);
bool CheckBlock() const;
bool CheckBlock(bool fCheckPOW=true, bool fCheckMerkleRoot=true) const;
bool AcceptBlock();
private: