示例#1
0
文件: policy.cpp 项目: bsjung/bitcoin
bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
{
    if (tx.IsCoinBase())
        return true; // Coinbases don't use vin normally

    for (unsigned int i = 0; i < tx.vin.size(); i++)
    {
        const CTxOut& prev = mapInputs.AccessCoin(tx.vin[i].prevout).out;

        std::vector<std::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;

        if (whichType == TX_SCRIPTHASH)
        {
            std::vector<std::vector<unsigned char> > stack;
            // convert the scriptSig into a stack, so we can inspect the redeemScript
            if (!EvalScript(stack, tx.vin[i].scriptSig, SCRIPT_VERIFY_NONE, BaseSignatureChecker(), SIGVERSION_BASE))
                return false;
            if (stack.empty())
                return false;
            CScript subscript(stack.back().begin(), stack.back().end());
            if (subscript.GetSigOpCount(true) > MAX_P2SH_SIGOPS) {
                return false;
            }
        }
    }

    return true;
}
void ReplaceRedeemScript(CScript& script, const CScript& redeemScript)
{
    std::vector<valtype> stack;
    EvalScript(stack, script, SCRIPT_VERIFY_STRICTENC, BaseSignatureChecker(), SIGVERSION_BASE);
    assert(stack.size() > 0);
    stack.back() = std::vector<unsigned char>(redeemScript.begin(), redeemScript.end());
    script = PushAll(stack);
}
示例#3
0
bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
{
    if (tx.IsCoinBase())
        return true; // Coinbases don't use vin normally

    for (unsigned int i = 0; i < tx.vin.size(); i++)
    {
        const CTxOut& prev = mapInputs.GetOutputFor(tx.vin[i]);

        std::vector<std::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);
        if (nArgsExpected < 0)
            return false;

        // 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
        // IsStandardTx() will have already returned false
        // and this method isn't called.
        std::vector<std::vector<unsigned char> > stack;
        if (!EvalScript(stack, tx.vin[i].scriptSig, SCRIPT_VERIFY_NONE, BaseSignatureChecker()))
            return false;

        if (whichType == TX_SCRIPTHASH)
        {
            if (stack.empty())
                return false;
            CScript subscript(stack.back().begin(), stack.back().end());
            std::vector<std::vector<unsigned char> > vSolutions2;
            txnouttype whichType2;
            if (Solver(subscript, whichType2, vSolutions2))
            {
                int tmpExpected = ScriptSigArgsExpected(whichType2, vSolutions2);
                if (tmpExpected < 0)
                    return false;
                nArgsExpected += tmpExpected;
            }
            else
            {
                // Any other Script with less than 15 sigops OK:
                unsigned int sigops = subscript.GetSigOpCount(true);
                // ... extra data left on the stack after execution is OK, too:
                return (sigops <= MAX_P2SH_SIGOPS);
            }
        }

        if (stack.size() != (unsigned int)nArgsExpected)
            return false;
    }

    return true;
}
示例#4
0
文件: policy.cpp 项目: bsjung/bitcoin
bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
{
    if (tx.IsCoinBase())
        return true; // Coinbases are skipped

    for (unsigned int i = 0; i < tx.vin.size(); i++)
    {
        // We don't care if witness for this input is empty, since it must not be bloated.
        // If the script is invalid without witness, it would be caught sooner or later during validation.
        if (tx.vin[i].scriptWitness.IsNull())
            continue;

        const CTxOut &prev = mapInputs.AccessCoin(tx.vin[i].prevout).out;

        // get the scriptPubKey corresponding to this input:
        CScript prevScript = prev.scriptPubKey;

        if (prevScript.IsPayToScriptHash()) {
            std::vector <std::vector<unsigned char> > stack;
            // If the scriptPubKey is P2SH, we try to extract the redeemScript casually by converting the scriptSig
            // into a stack. We do not check IsPushOnly nor compare the hash as these will be done later anyway.
            // If the check fails at this stage, we know that this txid must be a bad one.
            if (!EvalScript(stack, tx.vin[i].scriptSig, SCRIPT_VERIFY_NONE, BaseSignatureChecker(), SIGVERSION_BASE))
                return false;
            if (stack.empty())
                return false;
            prevScript = CScript(stack.back().begin(), stack.back().end());
        }

        int witnessversion = 0;
        std::vector<unsigned char> witnessprogram;

        // Non-witness program must not be associated with any witness
        if (!prevScript.IsWitnessProgram(witnessversion, witnessprogram))
            return false;

        // Check P2WSH standard limits
        if (witnessversion == 0 && witnessprogram.size() == 32) {
            if (tx.vin[i].scriptWitness.stack.back().size() > MAX_STANDARD_P2WSH_SCRIPT_SIZE)
                return false;
            size_t sizeWitnessStack = tx.vin[i].scriptWitness.stack.size() - 1;
            if (sizeWitnessStack > MAX_STANDARD_P2WSH_STACK_ITEMS)
                return false;
            for (unsigned int j = 0; j < sizeWitnessStack; j++) {
                if (tx.vin[i].scriptWitness.stack[j].size() > MAX_STANDARD_P2WSH_STACK_ITEM_SIZE)
                    return false;
            }
        }
    }
    return true;
}