diff options
Diffstat (limited to 'src/script.cpp')
| -rw-r--r-- | src/script.cpp | 95 |
1 files changed, 38 insertions, 57 deletions
diff --git a/src/script.cpp b/src/script.cpp index e60399120f..5487c01fab 100644 --- a/src/script.cpp +++ b/src/script.cpp @@ -70,7 +70,7 @@ static inline void popstack(vector<valtype>& stack) } -const char* GetTxnTypeName(txntype t) +const char* GetTxnOutputType(txnouttype t) { switch (t) { @@ -230,12 +230,12 @@ const char* GetOpName(opcodetype opcode) } } - // // Returns true if script is valid. // bool EvalScriptInner(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, int nHashType, - CScript::const_iterator pbegincodehash, CScript::const_iterator pendcodehash, int& nOpCount, int& nSigOpCount, int nRecurseDepth) + CScript::const_iterator pbegincodehash, CScript::const_iterator pendcodehash, int& nOpCount, int& nSigOpCount, + bool fStrictOpEval, int nRecurseDepth) { CAutoBN_CTX pctx; CScript::const_iterator pc = script.begin(); @@ -1014,17 +1014,9 @@ bool EvalScriptInner(vector<vector<unsigned char> >& stack, const CScript& scrip case OP_EVAL: { - // This code should be removed when OP_EVAL has - // a majority of hashing power on the network. - // OP_EVAL behaves just like OP_NOP until - // opevaltime : - if (!fTestNet || fDebug) - { - // 1328054400 is Feb 1, 2012 - int64 nEvalSwitchTime = GetArg("opevaltime", 1328054400); - if (GetTime() < nEvalSwitchTime) - break; - } + if (!fStrictOpEval) + break; // Act as a NO_OP + // Evaluate the top item on the stack as a Script // [serialized script ] -- [result(s) of executing script] @@ -1034,12 +1026,14 @@ bool EvalScriptInner(vector<vector<unsigned char> >& stack, const CScript& scrip CScript subscript(vchScript.begin(), vchScript.end()); popstack(stack); - // Codeseparators not allowed + // Codeseparators not allowed; they don't make sense 'inside' an OP_EVAL, because + // their purpose is to change which parts of the scriptPubKey script is copied + // and signed by OP_CHECKSIG, but OP_EVAl'ed code is in the scriptSig, not the scriptPubKey. if (subscript.Find(OP_CODESEPARATOR)) return false; if (!EvalScriptInner(stack, subscript, txTo, nIn, nHashType, - pbegincodehash, pendcodehash, nOpCount, nSigOpCount, nRecurseDepth++)) + pbegincodehash, pendcodehash, nOpCount, nSigOpCount, fStrictOpEval, nRecurseDepth++)) return false; } break; @@ -1066,14 +1060,15 @@ bool EvalScriptInner(vector<vector<unsigned char> >& stack, const CScript& scrip } bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, - const CTransaction& txTo, unsigned int nIn, int nHashType, int& nSigOpCountRet) + const CTransaction& txTo, unsigned int nIn, int nHashType, + bool fStrictOpEval, int& nSigOpCountRet) { CScript::const_iterator pbegincodehash = script.begin(); CScript::const_iterator pendcodehash = script.end(); int nOpCount = 0; return EvalScriptInner(stack, script, txTo, nIn, nHashType, pbegincodehash, pendcodehash, - nOpCount, nSigOpCountRet, 0); + nOpCount, nSigOpCountRet, fStrictOpEval, 0); } @@ -1177,10 +1172,10 @@ bool CheckSig(vector<unsigned char> vchSig, vector<unsigned char> vchPubKey, CSc // // Return public keys or hashes from scriptPubKey, for 'standard' transaction types. // -bool Solver(const CScript& scriptPubKey, txntype& typeRet, vector<vector<unsigned char> >& vSolutionsRet) +bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsigned char> >& vSolutionsRet) { // Templates - static map<txntype, CScript> mTemplates; + static map<txnouttype, CScript> mTemplates; if (mTemplates.empty()) { // Standard tx, sender provides pubkey, receiver adds signature @@ -1199,7 +1194,7 @@ bool Solver(const CScript& scriptPubKey, txntype& typeRet, vector<vector<unsigne // Scan templates const CScript& script1 = scriptPubKey; - BOOST_FOREACH(const PAIRTYPE(txntype, CScript)& tplate, mTemplates) + BOOST_FOREACH(const PAIRTYPE(txnouttype, CScript)& tplate, mTemplates) { const CScript& script2 = tplate.second; vSolutionsRet.clear(); @@ -1331,13 +1326,13 @@ bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, uint256 hash { scriptSigRet.clear(); - txntype whichType; + txnouttype whichType; vector<valtype> vSolutions; if (!Solver(scriptPubKey, whichType, vSolutions)) return false; CBitcoinAddress address; - valtype subscript; + CScript subscript; switch (whichType) { case TX_NONSTANDARD: @@ -1359,10 +1354,11 @@ bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, uint256 hash case TX_SCRIPTHASH: if (!keystore.GetCScript(uint160(vSolutions[0]), subscript)) return false; - if (!Solver(keystore, CScript(subscript.begin(), subscript.end()), hash, nHashType, scriptSigRet)) + if (!Solver(keystore, subscript, hash, nHashType, scriptSigRet)) return false; if (hash != 0) - scriptSigRet << subscript; // signatures AND serialized script + // static_cast to get vector.operator<< instead of CScript.operator<< + scriptSigRet << static_cast<valtype>(subscript); // signatures AND serialized script break; case TX_MULTISIG: scriptSigRet << OP_0; // workaround CHECKMULTISIG bug @@ -1375,7 +1371,7 @@ bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, uint256 hash bool IsStandard(const CScript& scriptPubKey) { vector<valtype> vSolutions; - txntype whichType; + txnouttype whichType; if (!Solver(scriptPubKey, whichType, vSolutions)) return false; @@ -1410,7 +1406,7 @@ int HaveKeys(const vector<valtype>& pubkeys, const CKeyStore& keystore) bool IsMine(const CKeyStore &keystore, const CScript& scriptPubKey) { vector<valtype> vSolutions; - txntype whichType; + txnouttype whichType; if (!Solver(scriptPubKey, whichType, vSolutions)) return false; @@ -1427,10 +1423,10 @@ bool IsMine(const CKeyStore &keystore, const CScript& scriptPubKey) return keystore.HaveKey(address); case TX_SCRIPTHASH: { - valtype subscript; + CScript subscript; if (!keystore.GetCScript(uint160(vSolutions[0]), subscript)) return false; - return IsMine(keystore, CScript(subscript.begin(), subscript.end())); + return IsMine(keystore, subscript); } case TX_MULTISIG: { @@ -1449,7 +1445,7 @@ bool IsMine(const CKeyStore &keystore, const CScript& scriptPubKey) bool ExtractAddress(const CScript& scriptPubKey, const CKeyStore* keystore, CBitcoinAddress& addressRet) { vector<valtype> vSolutions; - txntype whichType; + txnouttype whichType; if (!Solver(scriptPubKey, whichType, vSolutions)) return false; @@ -1472,7 +1468,7 @@ bool ExtractAddress(const CScript& scriptPubKey, const CKeyStore* keystore, CBit return false; } -bool ExtractAddresses(const CScript& scriptPubKey, const CKeyStore* keystore, txntype& typeRet, vector<CBitcoinAddress>& addressRet, int& nRequiredRet) +bool ExtractAddresses(const CScript& scriptPubKey, const CKeyStore* keystore, txnouttype& typeRet, vector<CBitcoinAddress>& addressRet, int& nRequiredRet) { addressRet.clear(); typeRet = TX_NONSTANDARD; @@ -1484,10 +1480,10 @@ bool ExtractAddresses(const CScript& scriptPubKey, const CKeyStore* keystore, tx { nRequiredRet = vSolutions.front()[0]; int n = vSolutions.back()[0]; - for (vector<valtype>::const_iterator it = vSolutions.begin()+1; it != vSolutions.begin()+vSolutions.size()-1; it++) + for (int i = 1; i < vSolutions.size()-1; i++) { CBitcoinAddress address; - address.SetPubKey(*it); + address.SetPubKey(vSolutions[i]); addressRet.push_back(address); } } @@ -1507,12 +1503,13 @@ bool ExtractAddresses(const CScript& scriptPubKey, const CKeyStore* keystore, tx return true; } -bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, int& nSigOpCountRet, int nHashType) +bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn, int& nSigOpCountRet, + int nHashType, bool fStrictOpEval) { vector<vector<unsigned char> > stack; - if (!EvalScript(stack, scriptSig, txTo, nIn, nHashType, nSigOpCountRet)) + if (!EvalScript(stack, scriptSig, txTo, nIn, nHashType, fStrictOpEval, nSigOpCountRet)) return false; - if (!EvalScript(stack, scriptPubKey, txTo, nIn, nHashType, nSigOpCountRet)) + if (!EvalScript(stack, scriptPubKey, txTo, nIn, nHashType, fStrictOpEval, nSigOpCountRet)) return false; if (stack.empty()) return false; @@ -1521,24 +1518,8 @@ bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, const C // This code should be removed when a compatibility-breaking block chain split has passed. // Special check for OP_EVAL backwards-compatibility: if scriptPubKey or scriptSig contains // OP_EVAL, then result must be identical if OP_EVAL is treated as a no-op: - if (scriptSig.Find(OP_EVAL)+scriptPubKey.Find(OP_EVAL) > 0) - { - int nUnused = 0; - stack.clear(); - CScript sigCopy = scriptSig; - sigCopy.FindAndDelete(CScript(OP_EVAL)); - CScript pubKeyCopy = scriptPubKey; - pubKeyCopy.FindAndDelete(CScript(OP_EVAL)); - - if (!EvalScript(stack, sigCopy, txTo, nIn, nHashType, nUnused)) - return false; - if (!EvalScript(stack, pubKeyCopy, txTo, nIn, nHashType, nUnused)) - return false; - if (stack.empty()) - return false; - if (fResult != CastToBool(stack.back())) - return false; - } + if (fResult && fStrictOpEval && (scriptPubKey.Find(OP_EVAL) || scriptSig.Find(OP_EVAL))) + return VerifyScript(scriptSig, scriptPubKey, txTo, nIn, nSigOpCountRet, nHashType, false); return fResult; } @@ -1563,14 +1544,14 @@ bool SignSignature(const CKeyStore &keystore, const CTransaction& txFrom, CTrans // Test solution int nUnused = 0; if (scriptPrereq.empty()) - if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, nUnused, 0)) + if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, nUnused, 0, true)) return false; return true; } -bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, int& nSigOpCountRet, int nHashType) +bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsigned int nIn, int& nSigOpCountRet, int nHashType, bool fStrictOpEval) { assert(nIn < txTo.vin.size()); const CTxIn& txin = txTo.vin[nIn]; @@ -1581,7 +1562,7 @@ bool VerifySignature(const CTransaction& txFrom, const CTransaction& txTo, unsig if (txin.prevout.hash != txFrom.GetHash()) return false; - if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, nSigOpCountRet, nHashType)) + if (!VerifyScript(txin.scriptSig, txout.scriptPubKey, txTo, nIn, nSigOpCountRet, nHashType, fStrictOpEval)) return false; return true; |