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// Copyright (c) 2017-2021 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 <consensus/tx_check.h>
#include <consensus/amount.h>
#include <primitives/transaction.h>
#include <consensus/validation.h>
bool CheckTransaction(const CTransaction& tx, TxValidationState& state)
{
// Basic checks that don't depend on any context
if (tx.vin.empty())
return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vin-empty");
if (tx.vout.empty())
return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-empty");
// Size limits (this doesn't take the witness into account, as that hasn't been checked for malleability)
if (::GetSerializeSize(TX_NO_WITNESS(tx)) * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT) {
return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-oversize");
}
// Check for negative or overflow output values (see CVE-2010-5139)
CAmount nValueOut = 0;
for (const auto& txout : tx.vout)
{
if (txout.nValue < 0)
return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-negative");
if (txout.nValue > MAX_MONEY)
return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-toolarge");
nValueOut += txout.nValue;
if (!MoneyRange(nValueOut))
return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-txouttotal-toolarge");
}
// Check for duplicate inputs (see CVE-2018-17144)
// While Consensus::CheckTxInputs does check if all inputs of a tx are available, and UpdateCoins marks all inputs
// of a tx as spent, it does not check if the tx has duplicate inputs.
// Failure to run this check will result in either a crash or an inflation bug, depending on the implementation of
// the underlying coins database.
std::set<COutPoint> vInOutPoints;
for (const auto& txin : tx.vin) {
if (!vInOutPoints.insert(txin.prevout).second)
return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-inputs-duplicate");
}
if (tx.IsCoinBase())
{
if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 100)
return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-cb-length");
}
else
{
for (const auto& txin : tx.vin)
if (txin.prevout.IsNull())
return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-prevout-null");
}
return true;
}
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