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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.
56 lines
1.4 KiB
C
56 lines
1.4 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_ERROR_H
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#define BITCOIN_SCRIPT_ERROR_H
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typedef enum ScriptError_t
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{
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SCRIPT_ERR_OK = 0,
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SCRIPT_ERR_UNKNOWN_ERROR,
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SCRIPT_ERR_EVAL_FALSE,
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SCRIPT_ERR_OP_RETURN,
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/* Max sizes */
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SCRIPT_ERR_SCRIPT_SIZE,
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SCRIPT_ERR_PUSH_SIZE,
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SCRIPT_ERR_OP_COUNT,
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SCRIPT_ERR_STACK_SIZE,
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SCRIPT_ERR_SIG_COUNT,
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SCRIPT_ERR_PUBKEY_COUNT,
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/* Failed verify operations */
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SCRIPT_ERR_VERIFY,
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SCRIPT_ERR_EQUALVERIFY,
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SCRIPT_ERR_CHECKMULTISIGVERIFY,
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SCRIPT_ERR_CHECKSIGVERIFY,
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SCRIPT_ERR_NUMEQUALVERIFY,
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/* Logical/Format/Canonical errors */
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SCRIPT_ERR_BAD_OPCODE,
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SCRIPT_ERR_DISABLED_OPCODE,
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SCRIPT_ERR_INVALID_STACK_OPERATION,
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SCRIPT_ERR_INVALID_ALTSTACK_OPERATION,
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SCRIPT_ERR_UNBALANCED_CONDITIONAL,
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/* BIP62 */
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SCRIPT_ERR_SIG_HASHTYPE,
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SCRIPT_ERR_SIG_DER,
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SCRIPT_ERR_MINIMALDATA,
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SCRIPT_ERR_SIG_PUSHONLY,
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SCRIPT_ERR_SIG_HIGH_S,
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SCRIPT_ERR_SIG_NULLDUMMY,
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/* softfork safeness */
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SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS,
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SCRIPT_ERR_ERROR_COUNT
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} ScriptError;
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#define SCRIPT_ERR_LAST SCRIPT_ERR_ERROR_COUNT
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const char* ScriptErrorString(const ScriptError error);
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#endif // BITCOIN_SCRIPT_ERROR_H
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