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policy.h 6.2KB

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  1. // Copyright (c) 2009-2010 Satoshi Nakamoto
  2. // Copyright (c) 2009-2017 The Bitcoin Core developers
  3. // Distributed under the MIT software license, see the accompanying
  4. // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  5. #ifndef BITCOIN_POLICY_POLICY_H
  6. #define BITCOIN_POLICY_POLICY_H
  7. #include <consensus/consensus.h>
  8. #include <policy/feerate.h>
  9. #include <script/interpreter.h>
  10. #include <script/standard.h>
  11. #include <string>
  12. class CCoinsViewCache;
  13. class CTxOut;
  14. /** Default for -blockmaxweight, which controls the range of block weights the mining code will create **/
  15. static const unsigned int DEFAULT_BLOCK_MAX_WEIGHT = MAX_BLOCK_WEIGHT - 4000;
  16. /** Default for -blockmintxfee, which sets the minimum feerate for a transaction in blocks created by mining code **/
  17. static const unsigned int DEFAULT_BLOCK_MIN_TX_FEE = 1000;
  18. /** The maximum weight for transactions we're willing to relay/mine */
  19. static const unsigned int MAX_STANDARD_TX_WEIGHT = 400000;
  20. /** The minimum non-witness size for transactions we're willing to relay/mine (1 segwit input + 1 P2WPKH output = 82 bytes) */
  21. static const unsigned int MIN_STANDARD_TX_NONWITNESS_SIZE = 82;
  22. /** Maximum number of signature check operations in an IsStandard() P2SH script */
  23. static const unsigned int MAX_P2SH_SIGOPS = 15;
  24. /** The maximum number of sigops we're willing to relay/mine in a single tx */
  25. static const unsigned int MAX_STANDARD_TX_SIGOPS_COST = MAX_BLOCK_SIGOPS_COST/5;
  26. /** Default for -maxmempool, maximum megabytes of mempool memory usage */
  27. static const unsigned int DEFAULT_MAX_MEMPOOL_SIZE = 300;
  28. /** Default for -incrementalrelayfee, which sets the minimum feerate increase for mempool limiting or BIP 125 replacement **/
  29. static const unsigned int DEFAULT_INCREMENTAL_RELAY_FEE = 1000;
  30. /** Default for -bytespersigop */
  31. static const unsigned int DEFAULT_BYTES_PER_SIGOP = 20;
  32. /** The maximum number of witness stack items in a standard P2WSH script */
  33. static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEMS = 100;
  34. /** The maximum size of each witness stack item in a standard P2WSH script */
  35. static const unsigned int MAX_STANDARD_P2WSH_STACK_ITEM_SIZE = 80;
  36. /** The maximum size of a standard witnessScript */
  37. static const unsigned int MAX_STANDARD_P2WSH_SCRIPT_SIZE = 3600;
  38. /** Min feerate for defining dust. Historically this has been based on the
  39. * minRelayTxFee, however changing the dust limit changes which transactions are
  40. * standard and should be done with care and ideally rarely. It makes sense to
  41. * only increase the dust limit after prior releases were already not creating
  42. * outputs below the new threshold */
  43. static const unsigned int DUST_RELAY_TX_FEE = 3000;
  44. /**
  45. * Standard script verification flags that standard transactions will comply
  46. * with. However scripts violating these flags may still be present in valid
  47. * blocks and we must accept those blocks.
  48. */
  49. static constexpr unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
  50. SCRIPT_VERIFY_DERSIG |
  51. SCRIPT_VERIFY_STRICTENC |
  52. SCRIPT_VERIFY_MINIMALDATA |
  53. SCRIPT_VERIFY_NULLDUMMY |
  54. SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS |
  55. SCRIPT_VERIFY_CLEANSTACK |
  56. SCRIPT_VERIFY_MINIMALIF |
  57. SCRIPT_VERIFY_NULLFAIL |
  58. SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY |
  59. SCRIPT_VERIFY_CHECKSEQUENCEVERIFY |
  60. SCRIPT_VERIFY_LOW_S |
  61. SCRIPT_VERIFY_WITNESS |
  62. SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM |
  63. SCRIPT_VERIFY_WITNESS_PUBKEYTYPE |
  64. SCRIPT_VERIFY_CONST_SCRIPTCODE;
  65. /** For convenience, standard but not mandatory verify flags. */
  66. static constexpr unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
  67. /** Used as the flags parameter to sequence and nLocktime checks in non-consensus code. */
  68. static constexpr unsigned int STANDARD_LOCKTIME_VERIFY_FLAGS = LOCKTIME_VERIFY_SEQUENCE |
  69. LOCKTIME_MEDIAN_TIME_PAST;
  70. CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFee);
  71. bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFee);
  72. bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType, const bool witnessEnabled = false);
  73. /**
  74. * Check for standard transaction types
  75. * @return True if all outputs (scriptPubKeys) use only standard transaction forms
  76. */
  77. bool IsStandardTx(const CTransaction& tx, std::string& reason, const bool witnessEnabled = false);
  78. /**
  79. * Check for standard transaction types
  80. * @param[in] mapInputs Map of previous transactions that have outputs we're spending
  81. * @return True if all inputs (scriptSigs) use only standard transaction forms
  82. */
  83. bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
  84. /**
  85. * Check if the transaction is over standard P2WSH resources limit:
  86. * 3600bytes witnessScript size, 80bytes per witness stack element, 100 witness stack elements
  87. * These limits are adequate for multi-signature up to n-of-100 using OP_CHECKSIG, OP_ADD, and OP_EQUAL,
  88. */
  89. bool IsWitnessStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs);
  90. extern CFeeRate incrementalRelayFee;
  91. extern CFeeRate dustRelayFee;
  92. extern unsigned int nBytesPerSigOp;
  93. /** Compute the virtual transaction size (weight reinterpreted as bytes). */
  94. int64_t GetVirtualTransactionSize(int64_t nWeight, int64_t nSigOpCost);
  95. int64_t GetVirtualTransactionSize(const CTransaction& tx, int64_t nSigOpCost = 0);
  96. #endif // BITCOIN_POLICY_POLICY_H