#include <consensus/consensus.h>
#include <policy/feerate.h>
#include <script/interpreter.h>
#include <script/standard.h>
#include <string>

Include dependency graph for policy.h:

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Go to the source code of this file.

Functions
CAmount	GetDustThreshold (const CTxOut &txout, const CFeeRate &dustRelayFee)

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

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

bool	IsStandardTx (const CTransaction &tx, std::string &reason)
	Check for standard transaction types. More...

bool	AreInputsStandard (const CTransaction &tx, const CCoinsViewCache &mapInputs)
	Check for standard transaction types. More...

Variables
static const unsigned int	DEFAULT_BLOCK_MAX_SIZE = 2000000
	Default for -blockmaxsize, which controls the maximum size of block the mining code will create. More...

static const unsigned int	DEFAULT_BLOCK_MIN_TX_FEE = 1000
	Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by mining code. More...

static const unsigned int	MAX_STANDARD_TX_SIZE = 100000
	The maximum size for transactions we're willing to relay/mine. More...

static const unsigned int	MAX_P2SH_SIGOPS = 15
	Maximum number of signature check operations in an IsStandard() P2SH script. More...

static const unsigned int	MAX_STANDARD_TX_SIGOPS = 4000
	The maximum number of sigops we're willing to relay/mine in a single tx. More...

static const unsigned int	DEFAULT_MAX_MEMPOOL_SIZE = 300
	Default for -maxmempool, maximum megabytes of mempool memory usage. More...

static const unsigned int	DEFAULT_INCREMENTAL_RELAY_FEE = 1000
	Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or BIP 125 replacement. More...

static const unsigned int	DUST_RELAY_TX_FEE = 3000
	Min feerate for defining dust. More...

static const unsigned int	STANDARD_SCRIPT_VERIFY_FLAGS
	Standard script verification flags that standard transactions will comply with. More...

static const unsigned int	STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS
	For convenience, standard but not mandatory verify flags. More...

static const unsigned int	STANDARD_LOCKTIME_VERIFY_FLAGS
	Used as the flags parameter to sequence and nLocktime checks in non-consensus code. More...

CFeeRate	incrementalRelayFee

CFeeRate	dustRelayFee

Function Documentation

◆ AreInputsStandard()

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

Check for standard transaction types.

Parameters

[in] mapInputs Map of previous transactions that have outputs we're spending

Returns: True if all inputs (scriptSigs) use only standard transaction forms

Check for standard transaction types.

scriptSigs with extra data stuffed into them, not consumed by scriptPubKey (or P2SH script)
P2SH scripts with a crazy number of expensive CHECKSIG/CHECKMULTISIG operations

Why bother? To avoid denial-of-service attacks; an attacker can submit a standard HASH... OP_EQUAL transaction, which will get accepted into blocks. The redemption script can be anything; an attacker could use a very expensive-to-check-upon-redemption script like: DUP CHECKSIG DROP ... repeated 100 times... OP_1

Definition at line 142 of file policy.cpp.

References CCoinsViewCache::AccessCoin(), EvalScript(), CTransaction::IsCoinBase(), MAX_P2SH_SIGOPS, Coin::out, SCRIPT_VERIFY_NONE, CTxOut::scriptPubKey, SIGVERSION_BASE, Solver(), TX_SCRIPTHASH, and CTransaction::vin.

Referenced by AcceptToMemoryPoolWorker(), and CCoinsCaching().

◆ GetDustThreshold()

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

Definition at line 17 of file policy.cpp.

References CFeeRate::GetFee(), GetSerializeSize(), CScript::IsUnspendable(), CTxOut::scriptPubKey, and SER_DISK.

Referenced by IsDust().

◆ IsDust()

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

Definition at line 35 of file policy.cpp.

References GetDustThreshold(), and CTxOut::nValue.

Referenced by CWallet::CreateTransaction(), CTransactionBuilder::IsDust(), GUIUtil::isDust(), IsStandardTx(), PaymentServer::processPaymentRequest(), and CoinControlDialog::updateLabels().

◆ IsStandard()

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

Definition at line 40 of file policy.cpp.

References fAcceptDatacarrier, nMaxDatacarrierBytes, prevector< N, T, Size, Diff >::size(), Solver(), TX_MULTISIG, TX_NONSTANDARD, and TX_NULL_DATA.

Referenced by IsStandardTx().

◆ IsStandardTx()

bool IsStandardTx	(	const CTransaction &	tx,
		std::string &	reason
	)

Check for standard transaction types.

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

Definition at line 62 of file policy.cpp.

References CTransaction::CURRENT_VERSION, dustRelayFee, fIsBareMultisigStd, GetSerializeSize(), IsDust(), CScript::IsPushOnly(), IsStandard(), MAX_STANDARD_TX_SIZE, CTransaction::MAX_STANDARD_VERSION, CTransaction::nVersion, FeeCalculation::reason, CTxOut::scriptPubKey, CTxIn::scriptSig, SER_NETWORK, prevector< N, T, Size, Diff >::size(), TX_MULTISIG, TX_NULL_DATA, CTransaction::vin, and CTransaction::vout.

Referenced by AcceptToMemoryPoolWorker().

Variable Documentation

◆ DEFAULT_BLOCK_MAX_SIZE

const unsigned int DEFAULT_BLOCK_MAX_SIZE = 2000000

static

Default for -blockmaxsize, which controls the maximum size of block the mining code will create.

Definition at line 20 of file policy.h.

Referenced by DefaultOptions(), HelpMessage(), and BlockAssembler::Options::Options().

◆ DEFAULT_BLOCK_MIN_TX_FEE

const unsigned int DEFAULT_BLOCK_MIN_TX_FEE = 1000

static

Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by mining code.

Definition at line 22 of file policy.h.

Referenced by DefaultOptions(), HelpMessage(), and BlockAssembler::Options::Options().

◆ DEFAULT_INCREMENTAL_RELAY_FEE

const unsigned int DEFAULT_INCREMENTAL_RELAY_FEE = 1000

static

Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or BIP 125 replacement.

Definition at line 32 of file policy.h.

Referenced by HelpMessage().

◆ DEFAULT_MAX_MEMPOOL_SIZE

const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300

static

Default for -maxmempool, maximum megabytes of mempool memory usage.

Definition at line 30 of file policy.h.

Referenced by AcceptToMemoryPoolWorker(), AppInitMain(), AppInitParameterInteraction(), FlushStateToDisk(), GetMinimumFee(), HelpMessage(), mempoolInfoToJSON(), and UpdateMempoolForReorg().

◆ DUST_RELAY_TX_FEE

const unsigned int DUST_RELAY_TX_FEE = 3000

static

Min feerate for defining dust.

Historically this has been based on the minRelayTxFee, however changing the dust limit changes which transactions are standard and should be done with care and ideally rarely. It makes sense to only increase the dust limit after prior releases were already not creating outputs below the new threshold

Definition at line 38 of file policy.h.

Referenced by HelpMessage().

◆ dustRelayFee

CFeeRate dustRelayFee

Definition at line 177 of file policy.cpp.

Referenced by AppInitParameterInteraction(), CWallet::CreateTransaction(), GetDiscardRate(), GUIUtil::isDust(), IsStandardTx(), PaymentServer::processPaymentRequest(), and CoinControlDialog::updateLabels().

◆ incrementalRelayFee

CFeeRate incrementalRelayFee

Definition at line 176 of file policy.cpp.

Referenced by AppInitParameterInteraction(), CTxMemPool::GetMinFee(), getnetworkinfo(), and CTxMemPool::TrimToSize().

◆ MAX_P2SH_SIGOPS

const unsigned int MAX_P2SH_SIGOPS = 15

static

Maximum number of signature check operations in an IsStandard() P2SH script.

Definition at line 26 of file policy.h.

Referenced by AreInputsStandard().

◆ MAX_STANDARD_TX_SIGOPS

const unsigned int MAX_STANDARD_TX_SIGOPS = 4000

static

The maximum number of sigops we're willing to relay/mine in a single tx.

Definition at line 28 of file policy.h.

Referenced by AcceptToMemoryPoolWorker().

◆ MAX_STANDARD_TX_SIZE

const unsigned int MAX_STANDARD_TX_SIZE = 100000

static

The maximum size for transactions we're willing to relay/mine.

Definition at line 24 of file policy.h.

Referenced by AddOrphanTx(), ContextualCheckTransaction(), CWallet::CreateTransaction(), and IsStandardTx().

◆ STANDARD_LOCKTIME_VERIFY_FLAGS

const unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS

static

Initial value:

= LOCKTIME_VERIFY_SEQUENCE |

LOCKTIME_MEDIAN_TIME_PAST

LOCKTIME_VERIFY_SEQUENCE

static constexpr unsigned int LOCKTIME_VERIFY_SEQUENCE

Flags for nSequence and nLockTime locks.

Definition: consensus.h:28

LOCKTIME_MEDIAN_TIME_PAST

static constexpr unsigned int LOCKTIME_MEDIAN_TIME_PAST

Use GetMedianTimePast() instead of nTime for end point timestamp.

Definition: consensus.h:30

Used as the flags parameter to sequence and nLocktime checks in non-consensus code.

Definition at line 60 of file policy.h.

Referenced by AcceptToMemoryPoolWorker(), BlockAssembler::CreateNewBlock(), and UpdateMempoolForReorg().

◆ STANDARD_NOT_MANDATORY_VERIFY_FLAGS

const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS

static

For convenience, standard but not mandatory verify flags.

Definition at line 57 of file policy.h.

Referenced by CheckInputs().

◆ STANDARD_SCRIPT_VERIFY_FLAGS

const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS

static

Initial value:

= MANDATORY_SCRIPT_VERIFY_FLAGS |
                                                         SCRIPT_VERIFY_DERSIG |
                                                         SCRIPT_VERIFY_STRICTENC |
                                                         SCRIPT_VERIFY_MINIMALDATA |
                                                         SCRIPT_VERIFY_NULLDUMMY |
                                                         SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |
                                                         SCRIPT_VERIFY_CLEANSTACK |
                                                         SCRIPT_VERIFY_NULLFAIL |
                                                         SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY |
                                                         SCRIPT_VERIFY_CHECKSEQUENCEVERIFY |
                                                         SCRIPT_VERIFY_LOW_S

Standard script verification flags that standard transactions will comply with.

However scripts violating these flags may still be present in valid blocks and we must accept those blocks.

Definition at line 44 of file policy.h.

Referenced by AcceptToMemoryPoolWorker(), MutateTxSign(), ProduceSignature(), and signrawtransaction().

Dash Core Source Documentation (0.16.0.1)

Functions

Variables

Function Documentation

◆ AreInputsStandard()

◆ GetDustThreshold()

◆ IsDust()

◆ IsStandard()

◆ IsStandardTx()

Variable Documentation

◆ DEFAULT_BLOCK_MAX_SIZE

◆ DEFAULT_BLOCK_MIN_TX_FEE

◆ DEFAULT_INCREMENTAL_RELAY_FEE

◆ DEFAULT_MAX_MEMPOOL_SIZE

◆ DUST_RELAY_TX_FEE

◆ dustRelayFee

◆ incrementalRelayFee

◆ MAX_P2SH_SIGOPS

◆ MAX_STANDARD_TX_SIGOPS

◆ MAX_STANDARD_TX_SIZE

◆ STANDARD_LOCKTIME_VERIFY_FLAGS

◆ STANDARD_NOT_MANDATORY_VERIFY_FLAGS

◆ STANDARD_SCRIPT_VERIFY_FLAGS