tx_verify.cpp

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// Copyright (c) 2017-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "tx_verify.h"
 
#include "consensus/consensus.h"
#include "main.h"
#include "script/interpreter.h"
#include "timedata.h"
 
bool IsFinalTx(const CTransaction& tx, int nBlockHeight, int64_t nBlockTime)
{
    AssertLockHeld(cs_main);
    // Time based nLockTime implemented in 0.1.6
    if (tx.nLockTime == 0)
        return true;
    if (nBlockHeight == 0)
        nBlockHeight = chainActive.Height();
    if (nBlockTime == 0)
        nBlockTime = GetAdjustedTime();
    if ((int64_t)tx.nLockTime < ((int64_t)tx.nLockTime < LOCKTIME_THRESHOLD ? (int64_t)nBlockHeight : nBlockTime))
        return true;
    for (const CTxIn& txin : tx.vin)
        if (!txin.IsFinal())
            return false;
    return true;
}
 
unsigned int GetLegacySigOpCount(const CTransaction& tx)
{
    unsigned int nSigOps = 0;
    for (const CTxIn& txin : tx.vin) {
        nSigOps += txin.scriptSig.GetSigOpCount(false);
    }
    for (const CTxOut& txout : tx.vout) {
        nSigOps += txout.scriptPubKey.GetSigOpCount(false);
    }
    return nSigOps;
}
 
bool CheckTransaction(const CTransaction& tx, bool fRejectBadUTXO, CValidationState& state)
{
    // Basic checks that don't depend on any context
    if (tx.vin.empty())
        return state.DoS(10, error("CheckTransaction() : vin empty"),
            REJECT_INVALID, "bad-txns-vin-empty");
    if (tx.vout.empty())
        return state.DoS(10, error("CheckTransaction() : vout empty"),
            REJECT_INVALID, "bad-txns-vout-empty");
 
    // Size limits
    unsigned int nMaxSize = MAX_STANDARD_TX_SIZE;
 
    if (::GetSerializeSize(tx, SER_NETWORK, PROTOCOL_VERSION) > nMaxSize)
        return state.DoS(100, error("CheckTransaction() : size limits failed"),
            REJECT_INVALID, "bad-txns-oversize");
 
    // Check for negative or overflow output values
    for (const CTxOut& txout : tx.vout) {
        if (txout.IsEmpty() && !tx.IsCoinBase() && !tx.IsCoinStake())
            return state.DoS(100, error("CheckTransaction(): txout empty for user transaction"));
 
        if (txout.nValue < 0)
            return state.DoS(100, error("CheckTransaction() : txout.nValue negative"),
                REJECT_INVALID, "bad-txns-vout-negative");
        if (txout.nValue > MAX_MONEY_OUT) {
            return state.DoS(100, error("CheckTransaction() : txout.nValue too high"),
                REJECT_INVALID, "bad-txns-vout-toolarge");
        }
    }
 
    if (tx.IsCoinBase()) {
        if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 150)
            return state.DoS(100, error("CheckTransaction() : coinbase script size=%d", tx.vin[0].scriptSig.size()),
                REJECT_INVALID, "bad-cb-length");
    }
 
    return true;
}