dash/blackcoin-more
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Use block times for 'hard' OP_EVAL switchover, and refactored EvalScript

Browse Source 
so it takes a flag for how to interpret OP_EVAL.
Also increased IsStandard size of scriptSigs to 500 bytes, so
a 3-of-3 multisig transaction IsStandard.
This commit is contained in:
Gavin Andresen
2011-11-08 13:20:29 -05:00
parent a0871afb2b
commit 2a45a494b0
14 changed files with 178 additions and 178 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
src/main.cpp
View File

@@ -250,13 +250,13 @@ bool CTransaction::IsStandard() const
{
BOOST_FOREACH(const CTxIn& txin, vin)
{
// Biggest 'standard' txin is a 2-signature 2-of-3 escrow
// in an OP_EVAL, which is 2 ~80-byte signatures, 3
// Biggest 'standard' txin is a 3-signature 3-of-3 CHECKMULTISIG
// in an OP_EVAL, which is 3 ~80-byte signatures, 3
// ~65-byte public keys, plus a few script ops.
if (txin.scriptSig.size() > 400)
return error("nonstandard txin, size %d\n", txin.scriptSig.size());
if (txin.scriptSig.size() > 500)
return error("nonstandard txin, size %d is too large\n", txin.scriptSig.size());
if (!txin.scriptSig.IsPushOnly())
return error("nonstandard txin: %s", txin.scriptSig.ToString().c_str());
return error("nonstandard txin (opcodes other than PUSH): %s", txin.scriptSig.ToString().c_str());
}
BOOST_FOREACH(const CTxOut& txout, vout)
if (!::IsStandard(txout.scriptPubKey))
@@ -275,7 +275,7 @@ bool CTransaction::IsStandard() const
// expensive-to-check-upon-redemption script like:
// DUP CHECKSIG DROP ... repeated 100 times... OP_1
//
bool CTransaction::IsStandardInputs(std::map<uint256, std::pair<CTxIndex, CTransaction> > mapInputs) const
bool CTransaction::AreInputsStandard(std::map<uint256, std::pair<CTxIndex, CTransaction> > mapInputs) const
{
if (fTestNet)
return true; // Allow non-standard on testnet
@@ -287,18 +287,20 @@ bool CTransaction::IsStandardInputs(std::map<uint256, std::pair<CTxIndex, CTrans
CTransaction& txPrev = mapInputs[prevout.hash].second;
vector<vector<unsigned char> > vSolutions;
txntype whichType;
if (!Solver(txPrev.vout[vin[i].prevout.n].scriptPubKey, whichType, vSolutions))
return false;
txnouttype whichType;
// get the scriptPubKey corresponding to this input:
CScript& prevScript = txPrev.vout[prevout.n].scriptPubKey;
if (!Solver(prevScript, whichType, vSolutions))
return error("nonstandard txin (spending nonstandard txout %s)", prevScript.ToString().c_str());
if (whichType == TX_SCRIPTHASH)
{
vector<vector<unsigned char> > stack;
int nUnused;
if (!EvalScript(stack, vin[i].scriptSig, *this, i, 0, nUnused))
return false;
const vector<unsigned char>& subscript = stack.back();
if (!::IsStandard(CScript(subscript.begin(), subscript.end())))
if (!EvalScript(stack, vin[i].scriptSig, *this, i, 0, true, nUnused))
return false;
CScript subscript(stack.back().begin(), stack.back().end());
if (!::IsStandard(subscript))
return error("nonstandard txin (nonstandard OP_EVAL subscript %s)", subscript.ToString().c_str());
}
}
@@ -481,7 +483,7 @@ bool CTransaction::AcceptToMemoryPool(CTxDB& txdb, bool fCheckInputs, bool* pfMi
}
// Check for non-standard OP_EVALs in inputs
if (!IsStandardInputs(mapInputs))
if (!AreInputsStandard(mapInputs))
return error("AcceptToMemoryPool() : nonstandard transaction input");
// Check against previous transactions
@@ -978,9 +980,27 @@ bool CTransaction::ConnectInputs(map<uint256, pair<CTxIndex, CTransaction> > inp
// (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 && IsInitialBlockDownload()))
{
bool fStrictOpEval = true;
// This code should be removed when OP_EVAL has
// a majority of hashing power on the network.
if (fBlock)
{
// To avoid being on the short end of a block-chain split,
// interpret OP_EVAL as a NO_OP until blocks with timestamps
// after opevaltime:
int64 nEvalSwitchTime = GetArg("opevaltime", 1328054400); // Feb 1, 2012
fStrictOpEval = (pindexBlock->nTime >= nEvalSwitchTime);
}
// if !fBlock, then always be strict-- don't accept
// invalid-under-new-rules OP_EVAL transactions into
// our memory pool (don't relay them, don't include them
// in blocks we mine).
// Verify signature
if (!VerifySignature(txPrev, *this, i, nSigOpsRet))
if (!VerifySignature(txPrev, *this, i, nSigOpsRet, fStrictOpEval))
return DoS(100,error("ConnectInputs() : %s VerifySignature failed", GetHash().ToString().substr(0,10).c_str()));
}
// Check for conflicts (double-spend)
// This doesn't trigger the DoS code on purpose; if it did, it would make it easier
@@ -1054,7 +1074,7 @@ bool CTransaction::ClientConnectInputs()
// Verify signature
int nUnused = 0;
if (!VerifySignature(txPrev, *this, i, nUnused))
if (!VerifySignature(txPrev, *this, i, nUnused, false))
return error("ConnectInputs() : VerifySignature failed");
///// this is redundant with the mapNextTx stuff, not sure which I want to get rid of