policy.cpp File Reference

#include <policy/policy.h>
#include <coins.h>
#include <consensus/amount.h>
#include <consensus/consensus.h>
#include <consensus/validation.h>
#include <policy/feerate.h>
#include <primitives/transaction.h>
#include <script/interpreter.h>
#include <script/script.h>
#include <script/solver.h>
#include <serialize.h>
#include <span.h>
#include <algorithm>
#include <cstddef>
#include <vector>

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Functions
CAmount	GetDustThreshold (const CTxOut &txout, const CFeeRate &dustRelayFeeIn)
bool	IsDust (const CTxOut &txout, const CFeeRate &dustRelayFeeIn)
std::vector< uint32_t >	GetDust (const CTransaction &tx, CFeeRate dust_relay_rate)
	Get the vout index numbers of all dust outputs. More...
bool	IsStandard (const CScript &scriptPubKey, TxoutType &whichType)
bool	IsStandardTx (const CTransaction &tx, const std::optional< unsigned > &max_datacarrier_bytes, bool permit_bare_multisig, const CFeeRate &dust_relay_fee, std::string &reason)
	Check for standard transaction types. More...
static bool	CheckSigopsBIP54 (const CTransaction &tx, const CCoinsViewCache &inputs)
	Check the total number of non-witness sigops across the whole transaction, as per BIP54. More...
bool	AreInputsStandard (const CTransaction &tx, const CCoinsViewCache &mapInputs)
	Check transaction inputs. More...
bool	IsWitnessStandard (const CTransaction &tx, const CCoinsViewCache &mapInputs)
	Check if the transaction is over standard P2WSH resources limit: 3600bytes witnessScript size, 80bytes per witness stack element, 100 witness stack elements These limits are adequate for multisignatures up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL. More...
bool	SpendsNonAnchorWitnessProg (const CTransaction &tx, const CCoinsViewCache &prevouts)
	Check whether this transaction spends any witness program but P2A, including not-yet-defined ones. More...
int64_t	GetVirtualTransactionSize (int64_t nWeight, int64_t nSigOpCost, unsigned int bytes_per_sigop)
	Compute the virtual transaction size (weight reinterpreted as bytes). More...
int64_t	GetVirtualTransactionSize (const CTransaction &tx, int64_t nSigOpCost, unsigned int bytes_per_sigop)
int64_t	GetVirtualTransactionInputSize (const CTxIn &txin, int64_t nSigOpCost, unsigned int bytes_per_sigop)

Function Documentation

AreInputsStandard()

bool AreInputsStandard	(	const CTransaction &	tx,
		const CCoinsViewCache &	mapInputs
	)

Check transaction inputs.

Check for standard transaction types.

This does three things:

• Prevents mempool acceptance of spends of future segwit versions we don't know how to validate
• Mitigates a potential denial-of-service attack with P2SH scripts with a crazy number of expensive CHECKSIG/CHECKMULTISIG operations.
• Prevents spends of unknown/irregular scriptPubKeys, which mitigates potential denial-of-service attacks involving expensive scripts and helps reserve them as potential new upgrade hooks.

Note that only the non-witness portion of the transaction is checked here.

We also check the total number of non-witness sigops across the whole transaction, as per BIP54.

Definition at line 213 of file policy.cpp.

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CheckSigopsBIP54()

static bool CheckSigopsBIP54 ( const CTransaction &  tx, const CCoinsViewCache &  inputs  )

static

Check the total number of non-witness sigops across the whole transaction, as per BIP54.

Definition at line 169 of file policy.cpp.

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GetDust()

std::vector< uint32_t > GetDust	(	const CTransaction &	tx,
		CFeeRate	dust_relay_rate
	)

Get the vout index numbers of all dust outputs.

Definition at line 70 of file policy.cpp.

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GetDustThreshold()

CAmount GetDustThreshold	(	const CTxOut &	txout,
		const CFeeRate &	dustRelayFeeIn
	)

Definition at line 26 of file policy.cpp.

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GetVirtualTransactionInputSize()

int64_t GetVirtualTransactionInputSize	(	const CTxIn &	txin,
		int64_t	nSigOpCost,
		unsigned int	bytes_per_sigop
	)

Definition at line 386 of file policy.cpp.

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GetVirtualTransactionSize() [1/2]

int64_t GetVirtualTransactionSize	(	const CTransaction &	tx,
		int64_t	nSigOpCost,
		unsigned int	bytes_per_sigop
	)

Definition at line 381 of file policy.cpp.

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GetVirtualTransactionSize() [2/2]

int64_t GetVirtualTransactionSize	(	int64_t	nWeight,
		int64_t	nSigOpCost,
		unsigned int	bytes_per_sigop
	)

Compute the virtual transaction size (weight reinterpreted as bytes).

Definition at line 376 of file policy.cpp.

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IsDust()

bool IsDust	(	const CTxOut &	txout,
		const CFeeRate &	dustRelayFeeIn
	)

Definition at line 65 of file policy.cpp.

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IsStandard()

bool IsStandard	(	const CScript &	scriptPubKey,
		TxoutType &	whichType
	)

Definition at line 79 of file policy.cpp.

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IsStandardTx()

bool IsStandardTx	(	const CTransaction &	tx,
		const std::optional< unsigned > &	max_datacarrier_bytes,
		bool	permit_bare_multisig,
		const CFeeRate &	dust_relay_fee,
		std::string &	reason
	)

Check for standard transaction types.

Returns

True if all outputs (scriptPubKeys) use only standard transaction forms

Definition at line 99 of file policy.cpp.

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IsWitnessStandard()

bool IsWitnessStandard	(	const CTransaction &	tx,
		const CCoinsViewCache &	mapInputs
	)

Check if the transaction is over standard P2WSH resources limit: 3600bytes witnessScript size, 80bytes per witness stack element, 100 witness stack elements These limits are adequate for multisignatures up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL.

Also enforce a maximum stack item size limit and no annexes for tapscript spends.

Definition at line 251 of file policy.cpp.

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SpendsNonAnchorWitnessProg()

bool SpendsNonAnchorWitnessProg	(	const CTransaction &	tx,
		const CCoinsViewCache &	prevouts
	)

Check whether this transaction spends any witness program but P2A, including not-yet-defined ones.

May return false early for consensus-invalid transactions.

Definition at line 340 of file policy.cpp.

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