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03914234b3
NOP1 to NOP10 are reserved for future soft-fork upgrades. In the event
of an upgrade such NOPs have *VERIFY behavior, meaning that if their
arguments are not correct the script fails. Discouraging these NOPs by
rejecting transactions containing them from the mempool ensures that
we'll never accept transactions, nor mine blocks, with scripts that are
now invalid according to the majority of hashing power even if we're not
yet upgraded. Previously this wasn't an issue as the IsStandard() rules
didn't allow upgradable NOPs anyway, but 7f3b4e95 relaxed the
IsStandard() rules for P2SH redemptions allowing any redeemScript to be
spent.
We *do* allow upgradable NOPs in scripts so long as they are not
executed. This is harmless as there is no opportunity for the script to
be invalid post-upgrade.
94 lines
3.5 KiB
C++
94 lines
3.5 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2014 The Bitcoin developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_SCRIPT_STANDARD_H
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#define BITCOIN_SCRIPT_STANDARD_H
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#include "script/interpreter.h"
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#include "uint256.h"
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#include <boost/variant.hpp>
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#include <stdint.h>
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class CKeyID;
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class CScript;
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/** A reference to a CScript: the Hash160 of its serialization (see script.h) */
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class CScriptID : public uint160
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{
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public:
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CScriptID() : uint160(0) {}
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CScriptID(const CScript& in);
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CScriptID(const uint160& in) : uint160(in) {}
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};
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static const unsigned int MAX_OP_RETURN_RELAY = 40; //! bytes
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extern unsigned nMaxDatacarrierBytes;
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/**
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* Mandatory script verification flags that all new blocks must comply with for
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* them to be valid. (but old blocks may not comply with) Currently just P2SH,
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* but in the future other flags may be added, such as a soft-fork to enforce
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* strict DER encoding.
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*
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* Failing one of these tests may trigger a DoS ban - see CheckInputs() for
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* details.
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*/
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static const unsigned int MANDATORY_SCRIPT_VERIFY_FLAGS = SCRIPT_VERIFY_P2SH;
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/**
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* Standard script verification flags that standard transactions will comply
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* with. However scripts violating these flags may still be present in valid
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* blocks and we must accept those blocks.
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*/
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static const unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VERIFY_FLAGS |
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SCRIPT_VERIFY_STRICTENC |
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SCRIPT_VERIFY_MINIMALDATA |
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SCRIPT_VERIFY_NULLDUMMY |
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SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS;
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/** For convenience, standard but not mandatory verify flags. */
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static const unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
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enum txnouttype
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{
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TX_NONSTANDARD,
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// 'standard' transaction types:
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TX_PUBKEY,
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TX_PUBKEYHASH,
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TX_SCRIPTHASH,
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TX_MULTISIG,
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TX_NULL_DATA,
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};
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class CNoDestination {
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public:
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friend bool operator==(const CNoDestination &a, const CNoDestination &b) { return true; }
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friend bool operator<(const CNoDestination &a, const CNoDestination &b) { return true; }
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};
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/**
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* A txout script template with a specific destination. It is either:
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* * CNoDestination: no destination set
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* * CKeyID: TX_PUBKEYHASH destination
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* * CScriptID: TX_SCRIPTHASH destination
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* A CTxDestination is the internal data type encoded in a CBitcoinAddress
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*/
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typedef boost::variant<CNoDestination, CKeyID, CScriptID> CTxDestination;
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const char* GetTxnOutputType(txnouttype t);
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bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
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int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned char> >& vSolutions);
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bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType);
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bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet);
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bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet);
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CScript GetScriptForDestination(const CTxDestination& dest);
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CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys);
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#endif // BITCOIN_SCRIPT_STANDARD_H
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