diff options
Diffstat (limited to 'src/consensus')
-rw-r--r-- | src/consensus/tx_verify.cpp | 76 | ||||
-rw-r--r-- | src/consensus/tx_verify.h | 5 |
2 files changed, 42 insertions, 39 deletions
diff --git a/src/consensus/tx_verify.cpp b/src/consensus/tx_verify.cpp index 0a71915d1d..70aa9d7006 100644 --- a/src/consensus/tx_verify.cpp +++ b/src/consensus/tx_verify.cpp @@ -13,7 +13,7 @@ #include "chain.h" #include "coins.h" #include "utilmoneystr.h" - + bool IsFinalTx(const CTransaction &tx, int nBlockHeight, int64_t nBlockTime) { if (tx.nLockTime == 0) @@ -205,46 +205,46 @@ bool CheckTransaction(const CTransaction& tx, CValidationState &state, bool fChe return true; } -bool Consensus::CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight) +bool Consensus::CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight, CAmount& txfee) { - // This doesn't trigger the DoS code on purpose; if it did, it would make it easier - // for an attacker to attempt to split the network. - if (!inputs.HaveInputs(tx)) - return state.Invalid(false, 0, "", "Inputs unavailable"); - - CAmount nValueIn = 0; - CAmount nFees = 0; - for (unsigned int i = 0; i < tx.vin.size(); i++) - { - const COutPoint &prevout = tx.vin[i].prevout; - const Coin& coin = inputs.AccessCoin(prevout); - assert(!coin.IsSpent()); - - // If prev is coinbase, check that it's matured - if (coin.IsCoinBase()) { - if (nSpendHeight - coin.nHeight < COINBASE_MATURITY) - return state.Invalid(false, - REJECT_INVALID, "bad-txns-premature-spend-of-coinbase", - strprintf("tried to spend coinbase at depth %d", nSpendHeight - coin.nHeight)); - } - - // Check for negative or overflow input values - nValueIn += coin.out.nValue; - if (!MoneyRange(coin.out.nValue) || !MoneyRange(nValueIn)) - return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputvalues-outofrange"); + // are the actual inputs available? + if (!inputs.HaveInputs(tx)) { + return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputs-missingorspent", false, + strprintf("%s: inputs missing/spent", __func__)); + } + + CAmount nValueIn = 0; + for (unsigned int i = 0; i < tx.vin.size(); ++i) { + const COutPoint &prevout = tx.vin[i].prevout; + const Coin& coin = inputs.AccessCoin(prevout); + assert(!coin.IsSpent()); + + // If prev is coinbase, check that it's matured + if (coin.IsCoinBase() && nSpendHeight - coin.nHeight < COINBASE_MATURITY) { + return state.Invalid(false, + REJECT_INVALID, "bad-txns-premature-spend-of-coinbase", + strprintf("tried to spend coinbase at depth %d", nSpendHeight - coin.nHeight)); + } + // Check for negative or overflow input values + nValueIn += coin.out.nValue; + if (!MoneyRange(coin.out.nValue) || !MoneyRange(nValueIn)) { + return state.DoS(100, false, REJECT_INVALID, "bad-txns-inputvalues-outofrange"); } + } + + const CAmount value_out = tx.GetValueOut(); + if (nValueIn < value_out) { + return state.DoS(100, false, REJECT_INVALID, "bad-txns-in-belowout", false, + strprintf("value in (%s) < value out (%s)", FormatMoney(nValueIn), FormatMoney(value_out))); + } + + // Tally transaction fees + const CAmount txfee_aux = nValueIn - value_out; + if (!MoneyRange(txfee_aux)) { + return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-outofrange"); + } - if (nValueIn < tx.GetValueOut()) - return state.DoS(100, false, REJECT_INVALID, "bad-txns-in-belowout", false, - strprintf("value in (%s) < value out (%s)", FormatMoney(nValueIn), FormatMoney(tx.GetValueOut()))); - - // Tally transaction fees - CAmount nTxFee = nValueIn - tx.GetValueOut(); - if (nTxFee < 0) - return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-negative"); - nFees += nTxFee; - if (!MoneyRange(nFees)) - return state.DoS(100, false, REJECT_INVALID, "bad-txns-fee-outofrange"); + txfee = txfee_aux; return true; } diff --git a/src/consensus/tx_verify.h b/src/consensus/tx_verify.h index d46d3294ca..288892462d 100644 --- a/src/consensus/tx_verify.h +++ b/src/consensus/tx_verify.h @@ -5,6 +5,8 @@ #ifndef BITCOIN_CONSENSUS_TX_VERIFY_H #define BITCOIN_CONSENSUS_TX_VERIFY_H +#include "amount.h" + #include <stdint.h> #include <vector> @@ -22,9 +24,10 @@ namespace Consensus { /** * Check whether all inputs of this transaction are valid (no double spends and amounts) * This does not modify the UTXO set. This does not check scripts and sigs. + * @param[out] txfee Set to the transaction fee if successful. * Preconditions: tx.IsCoinBase() is false. */ -bool CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight); +bool CheckTxInputs(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& inputs, int nSpendHeight, CAmount& txfee); } // namespace Consensus /** Auxiliary functions for transaction validation (ideally should not be exposed) */ |