policy.h File Reference

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

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Functions
CAmount	GetDustThreshold (const CTxOut &txout, const CFeeRate &dustRelayFee)
bool	IsDust (const CTxOut &txout, const CFeeRate &dustRelayFee)
bool	IsStandard (const CScript &scriptPubKey, txnouttype &whichType, const bool witnessEnabled=false)
	Check transaction inputs to mitigate two potential denial-of-service attacks: More...
bool	IsStandardTx (const CTransaction &tx, std::string &reason, const bool witnessEnabled=false)
	Check for standard transaction types. More...
bool	AreInputsStandard (const CTransaction &tx, const CCoinsViewCache &mapInputs)
	Check for standard transaction types. 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 multi-signature up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL,. More...
int64_t	GetVirtualTransactionSize (int64_t nWeight, int64_t nSigOpCost)
	Compute the virtual transaction size (weight reinterpreted as bytes). More...
int64_t	GetVirtualTransactionSize (const CTransaction &tx, int64_t nSigOpCost=0)

Variables
unsigned int	dgpMaxTxSigOps
	The maximum number of sigops we're willing to relay/mine in a single tx. More...
CFeeRate	incrementalRelayFee
CFeeRate	dustRelayFee
unsigned int	nBytesPerSigOp

Function Documentation

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

Definition at line 164 of file policy.cpp.

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

Definition at line 18 of file policy.cpp.

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int64_t GetVirtualTransactionSize	(	int64_t	nWeight,
		int64_t	nSigOpCost
	)

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

Definition at line 254 of file policy.cpp.

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int64_t GetVirtualTransactionSize	(	const CTransaction &	tx,
		int64_t	nSigOpCost = 0
	)

Definition at line 259 of file policy.cpp.

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

Definition at line 52 of file policy.cpp.

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

Check transaction inputs to mitigate two potential denial-of-service attacks:

1. scriptSigs with extra data stuffed into them, not consumed by scriptPubKey (or P2SH script)
2. 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 75 of file policy.cpp.

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

Check for standard transaction types.

Returns

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

Definition at line 100 of file policy.cpp.

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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 multi-signature up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL,.

Definition at line 198 of file policy.cpp.

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Variable Documentation

unsigned int dgpMaxTxSigOps

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

Definition at line 19 of file consensus.cpp.

CFeeRate dustRelayFee

Definition at line 251 of file policy.cpp.

CFeeRate incrementalRelayFee

Definition at line 250 of file policy.cpp.

unsigned int nBytesPerSigOp

Definition at line 252 of file policy.cpp.