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Merge pull request #4310

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7a9e0b6 Move checkpoint based heuristic checks to AcceptBlockHeader (Pieter Wuille)
This commit is contained in:
Wladimir J. van der Laan 2014-06-19 14:26:25 +02:00
commit b8b98d5642
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GPG key ID: 74810B012346C9A6
1 changed files with 22 additions and 22 deletions
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44
src/main.cpp
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@ -2351,28 +2351,6 @@ bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, bool f
return state.Invalid(error("CheckBlockHeader() : block timestamp too far in the future"),
REJECT_INVALID, "time-too-new");
CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(mapBlockIndex);
if (pcheckpoint && block.hashPrevBlock != (chainActive.Tip() ? chainActive.Tip()->GetBlockHash() : uint256(0)))
{
// Extra checks to prevent "fill up memory by spamming with bogus blocks"
int64_t deltaTime = block.GetBlockTime() - pcheckpoint->nTime;
if (deltaTime < 0)
{
return state.DoS(100, error("CheckBlockHeader() : block with timestamp before last checkpoint"),
REJECT_CHECKPOINT, "time-too-old");
}
bool fOverflow = false;
uint256 bnNewBlock;
bnNewBlock.SetCompact(block.nBits, NULL, &fOverflow);
uint256 bnRequired;
bnRequired.SetCompact(ComputeMinWork(pcheckpoint->nBits, deltaTime));
if (fOverflow || bnNewBlock > bnRequired)
{
return state.DoS(100, error("CheckBlockHeader() : block with too little proof-of-work"),
REJECT_INVALID, "bad-diffbits");
}
}
return true;
}
@ -2448,6 +2426,28 @@ bool AcceptBlockHeader(CBlockHeader& block, CValidationState& state, CBlockIndex
return state.Invalid(error("AcceptBlock() : block is marked invalid"), 0, "duplicate");
}
CBlockIndex* pcheckpoint = Checkpoints::GetLastCheckpoint(mapBlockIndex);
if (pcheckpoint && block.hashPrevBlock != (chainActive.Tip() ? chainActive.Tip()->GetBlockHash() : uint256(0)))
{
// Extra checks to prevent "fill up memory by spamming with bogus blocks"
int64_t deltaTime = block.GetBlockTime() - pcheckpoint->nTime;
if (deltaTime < 0)
{
return state.DoS(100, error("CheckBlockHeader() : block with timestamp before last checkpoint"),
REJECT_CHECKPOINT, "time-too-old");
}
bool fOverflow = false;
uint256 bnNewBlock;
bnNewBlock.SetCompact(block.nBits, NULL, &fOverflow);
uint256 bnRequired;
bnRequired.SetCompact(ComputeMinWork(pcheckpoint->nBits, deltaTime));
if (fOverflow || bnNewBlock > bnRequired)
{
return state.DoS(100, error("CheckBlockHeader() : block with too little proof-of-work"),
REJECT_INVALID, "bad-diffbits");
}
}
// Get prev block index
CBlockIndex* pindexPrev = NULL;
int nHeight = 0;