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Merge pull request #2273 from gavinandresen/txsize

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Make transactions larger than 100K non-standard
This commit is contained in:
Gavin Andresen
2013-02-05 07:12:27 -08:00
parent 0e2e4fdf27 41e1a0d766
commit 1d0851eca8
3 changed files with 11 additions and 1 deletions
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8
src/main.cpp
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@@ -362,6 +362,14 @@ bool CTransaction::IsStandard() const
if (!IsFinal())
return false;
// Extremely large transactions with lots of inputs can cost the network
// almost as much to process as they cost the sender in fees, because
// computing signature hashes is O(ninputs*txsize). Limiting transactions
// to MAX_STANDARD_TX_SIZE mitigates CPU exhaustion attacks.
unsigned int sz = this->GetSerializeSize(SER_NETWORK, CTransaction::CURRENT_VERSION);
if (sz >= MAX_STANDARD_TX_SIZE)
return false;
BOOST_FOREACH(const CTxIn& txin, vin)
{
// Biggest 'standard' txin is a 3-signature 3-of-3 CHECKMULTISIG