Fabcoin Core  0.16.2
P2P Digital Currency
Functions | Variables
policy.cpp File Reference
#include <policy/policy.h>
#include <consensus/validation.h>
#include <validation.h>
#include <coins.h>
#include <tinyformat.h>
#include <util.h>
#include <utilstrencodings.h>
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Functions

CAmount GetDustThreshold (const CTxOut &txout, const CFeeRate &dustRelayFeeIn)
 
bool IsDust (const CTxOut &txout, const CFeeRate &dustRelayFeeIn)
 
bool IsStandard (const CScript &scriptPubKey, txnouttype &whichType, const bool witnessEnabled)
 Check transaction inputs to mitigate two potential denial-of-service attacks: More...
 
bool IsStandardTx (const CTransaction &tx, std::string &reason, const bool witnessEnabled)
 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)
 

Variables

CFeeRate incrementalRelayFee = CFeeRate(DEFAULT_INCREMENTAL_RELAY_FEE)
 
CFeeRate dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE)
 
unsigned int nBytesPerSigOp = DEFAULT_BYTES_PER_SIGOP
 

Function Documentation

bool AreInputsStandard ( const CTransaction tx,
const CCoinsViewCache mapInputs 
)

Check for standard transaction types.

Parameters
[in]mapInputsMap 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 dustRelayFeeIn 
)

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 
)

Definition at line 259 of file policy.cpp.

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bool IsDust ( const CTxOut txout,
const CFeeRate dustRelayFeeIn 
)

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

CFeeRate dustRelayFee = CFeeRate(DUST_RELAY_TX_FEE)

Definition at line 251 of file policy.cpp.

CFeeRate incrementalRelayFee = CFeeRate(DEFAULT_INCREMENTAL_RELAY_FEE)

Definition at line 250 of file policy.cpp.

unsigned int nBytesPerSigOp = DEFAULT_BYTES_PER_SIGOP

Definition at line 252 of file policy.cpp.