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Return the script type from Solver

Browse Source 
Because false is synonymous with TX_NONSTANDARD, this conveys the same
information and makes the handling explicitly based on script type,
simplifying each call site.

Prior to this change it was common for the return value to be ignored,
or for the return value and TX_NONSTANDARD to be redundantly handled.
pull/13429/head
Ben Woosley 7 years ago
parent 0a34593ddb
commit 984d72ec65
No known key found for this signature in database
GPG Key ID: 6EE5F3785F78B345
10 changed files with 62 additions and 98 deletions
Show Stats Download Patch File Download Diff File

6
src/bloom.cpp
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@ -164,11 +164,11 @@ bool CBloomFilter::IsRelevantAndUpdate(const CTransaction& tx)
insert(COutPoint(hash, i));
else if ((nFlags & BLOOM_UPDATE_MASK) == BLOOM_UPDATE_P2PUBKEY_ONLY)
{
txnouttype type;
std::vector<std::vector<unsigned char> > vSolutions;
if (Solver(txout.scriptPubKey, type, vSolutions) &&
(type == TX_PUBKEY || type == TX_MULTISIG))
txnouttype type = Solver(txout.scriptPubKey, vSolutions);
if (type == TX_PUBKEY || type == TX_MULTISIG) {
insert(COutPoint(hash, i));
}
}
break;
}

3
src/core_write.cpp
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@ -141,8 +141,7 @@ void ScriptToUniv(const CScript& script, UniValue& out, bool include_address)
out.pushKV("hex", HexStr(script.begin(), script.end()));
std::vector<std::vector<unsigned char>> solns;
txnouttype type;
Solver(script, type, solns);
txnouttype type = Solver(script, solns);
out.pushKV("type", GetTxnOutputType(type));
CTxDestination address;

23
src/policy/policy.cpp
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@ -57,11 +57,11 @@ bool IsDust(const CTxOut& txout, const CFeeRate& dustRelayFeeIn)
bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType)
{
std::vector<std::vector<unsigned char> > vSolutions;
if (!Solver(scriptPubKey, whichType, vSolutions))
return false;
whichType = Solver(scriptPubKey, vSolutions);
if (whichType == TX_MULTISIG)
{
if (whichType == TX_NONSTANDARD || whichType == TX_WITNESS_UNKNOWN) {
return false;
} else if (whichType == TX_MULTISIG) {
unsigned char m = vSolutions.front()[0];
unsigned char n = vSolutions.back()[0];
// Support up to x-of-3 multisig txns as standard
@ -70,10 +70,11 @@ bool IsStandard(const CScript& scriptPubKey, txnouttype& whichType)
if (m < 1 || m > n)
return false;
} else if (whichType == TX_NULL_DATA &&
(!fAcceptDatacarrier || scriptPubKey.size() > nMaxDatacarrierBytes))
(!fAcceptDatacarrier || scriptPubKey.size() > nMaxDatacarrierBytes)) {
return false;
}
return whichType != TX_NONSTANDARD && whichType != TX_WITNESS_UNKNOWN;
return true;
}
bool IsStandardTx(const CTransaction& tx, std::string& reason)
@ -166,14 +167,10 @@ bool AreInputsStandard(const CTransaction& tx, const CCoinsViewCache& mapInputs)
const CTxOut& prev = mapInputs.AccessCoin(tx.vin[i].prevout).out;
std::vector<std::vector<unsigned char> > vSolutions;
txnouttype whichType;
// get the scriptPubKey corresponding to this input:
const CScript& prevScript = prev.scriptPubKey;
if (!Solver(prevScript, whichType, vSolutions))
txnouttype whichType = Solver(prev.scriptPubKey, vSolutions);
if (whichType == TX_NONSTANDARD) {
return false;
if (whichType == TX_SCRIPTHASH)
{
} else if (whichType == TX_SCRIPTHASH) {
std::vector<std::vector<unsigned char> > stack;
// convert the scriptSig into a stack, so we can inspect the redeemScript
if (!EvalScript(stack, tx.vin[i].scriptSig, SCRIPT_VERIFY_NONE, BaseSignatureChecker(), SigVersion::BASE))

3
src/rpc/rawtransaction.cpp
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@ -627,9 +627,8 @@ static UniValue decodescript(const JSONRPCRequest& request)
// P2SH and witness programs cannot be wrapped in P2WSH, if this script
// is a witness program, don't return addresses for a segwit programs.
if (type.get_str() == "pubkey" || type.get_str() == "pubkeyhash" || type.get_str() == "multisig" || type.get_str() == "nonstandard") {
txnouttype which_type;
std::vector<std::vector<unsigned char>> solutions_data;
Solver(script, which_type, solutions_data);
txnouttype which_type = Solver(script, solutions_data);
// Uncompressed pubkeys cannot be used with segwit checksigs.
// If the script contains an uncompressed pubkey, skip encoding of a segwit program.
if ((which_type == TX_PUBKEY) || (which_type == TX_MULTISIG)) {

3
src/script/ismine.cpp
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@ -60,8 +60,7 @@ IsMineResult IsMineInner(const CKeyStore& keystore, const CScript& scriptPubKey,
IsMineResult ret = IsMineResult::NO;
std::vector<valtype> vSolutions;
txnouttype whichType;
Solver(scriptPubKey, whichType, vSolutions);
txnouttype whichType = Solver(scriptPubKey, vSolutions);
CKeyID keyID;
switch (whichType)

10
src/script/sign.cpp
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@ -102,8 +102,7 @@ static bool SignStep(const SigningProvider& provider, const BaseSignatureCreator
std::vector<unsigned char> sig;
std::vector<valtype> vSolutions;
if (!Solver(scriptPubKey, whichTypeRet, vSolutions))
return false;
whichTypeRet = Solver(scriptPubKey, vSolutions);
switch (whichTypeRet)
{
@ -314,9 +313,8 @@ SignatureData DataFromTransaction(const CMutableTransaction& tx, unsigned int nI
}
// Get scripts
txnouttype script_type;
std::vector<std::vector<unsigned char>> solutions;
Solver(txout.scriptPubKey, script_type, solutions);
txnouttype script_type = Solver(txout.scriptPubKey, solutions);
SigVersion sigversion = SigVersion::BASE;
CScript next_script = txout.scriptPubKey;
@ -327,7 +325,7 @@ SignatureData DataFromTransaction(const CMutableTransaction& tx, unsigned int nI
next_script = std::move(redeem_script);
// Get redeemScript type
Solver(next_script, script_type, solutions);
script_type = Solver(next_script, solutions);
stack.script.pop_back();
}
if (script_type == TX_WITNESS_V0_SCRIPTHASH && !stack.witness.empty() && !stack.witness.back().empty()) {
@ -337,7 +335,7 @@ SignatureData DataFromTransaction(const CMutableTransaction& tx, unsigned int nI
next_script = std::move(witness_script);
// Get witnessScript type
Solver(next_script, script_type, solutions);
script_type = Solver(next_script, solutions);
stack.witness.pop_back();
stack.script = std::move(stack.witness);
stack.witness.clear();

57
src/script/standard.cpp
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@ -87,7 +87,7 @@ static bool MatchMultisig(const CScript& script, unsigned int& required, std::ve
return (it + 1 == script.end());
}
bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet)
txnouttype Solver(const CScript& scriptPubKey, std::vector<std::vector<unsigned char>>& vSolutionsRet)
{
vSolutionsRet.clear();
@ -95,33 +95,28 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::v
// it is always OP_HASH160 20 [20 byte hash] OP_EQUAL
if (scriptPubKey.IsPayToScriptHash())
{
typeRet = TX_SCRIPTHASH;
std::vector<unsigned char> hashBytes(scriptPubKey.begin()+2, scriptPubKey.begin()+22);
vSolutionsRet.push_back(hashBytes);
return true;
return TX_SCRIPTHASH;
}
int witnessversion;
std::vector<unsigned char> witnessprogram;
if (scriptPubKey.IsWitnessProgram(witnessversion, witnessprogram)) {
if (witnessversion == 0 && witnessprogram.size() == WITNESS_V0_KEYHASH_SIZE) {
typeRet = TX_WITNESS_V0_KEYHASH;
vSolutionsRet.push_back(witnessprogram);
return true;
return TX_WITNESS_V0_KEYHASH;
}
if (witnessversion == 0 && witnessprogram.size() == WITNESS_V0_SCRIPTHASH_SIZE) {
typeRet = TX_WITNESS_V0_SCRIPTHASH;
vSolutionsRet.push_back(witnessprogram);
return true;
return TX_WITNESS_V0_SCRIPTHASH;
}
if (witnessversion != 0) {
typeRet = TX_WITNESS_UNKNOWN;
vSolutionsRet.push_back(std::vector<unsigned char>{(unsigned char)witnessversion});
vSolutionsRet.push_back(std::move(witnessprogram));
return true;
return TX_WITNESS_UNKNOWN;
}
typeRet = TX_NONSTANDARD;
return false;
return TX_NONSTANDARD;
}
// Provably prunable, data-carrying output
@ -130,47 +125,39 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::v
// byte passes the IsPushOnly() test we don't care what exactly is in the
// script.
if (scriptPubKey.size() >= 1 && scriptPubKey[0] == OP_RETURN && scriptPubKey.IsPushOnly(scriptPubKey.begin()+1)) {
typeRet = TX_NULL_DATA;
return true;
return TX_NULL_DATA;
}
std::vector<unsigned char> data;
if (MatchPayToPubkey(scriptPubKey, data)) {
typeRet = TX_PUBKEY;
vSolutionsRet.push_back(std::move(data));
return true;
return TX_PUBKEY;
}
if (MatchPayToPubkeyHash(scriptPubKey, data)) {
typeRet = TX_PUBKEYHASH;
vSolutionsRet.push_back(std::move(data));
return true;
return TX_PUBKEYHASH;
}
unsigned int required;
std::vector<std::vector<unsigned char>> keys;
if (MatchMultisig(scriptPubKey, required, keys)) {
typeRet = TX_MULTISIG;
vSolutionsRet.push_back({static_cast<unsigned char>(required)}); // safe as required is in range 1..16
vSolutionsRet.insert(vSolutionsRet.end(), keys.begin(), keys.end());
vSolutionsRet.push_back({static_cast<unsigned char>(keys.size())}); // safe as size is in range 1..16
return true;
return TX_MULTISIG;
}
vSolutionsRet.clear();
typeRet = TX_NONSTANDARD;
return false;
return TX_NONSTANDARD;
}
bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
{
std::vector<valtype> vSolutions;
txnouttype whichType;
if (!Solver(scriptPubKey, whichType, vSolutions))
return false;
txnouttype whichType = Solver(scriptPubKey, vSolutions);
if (whichType == TX_PUBKEY)
{
if (whichType == TX_PUBKEY) {
CPubKey pubKey(vSolutions[0]);
if (!pubKey.IsValid())
return false;
@ -212,11 +199,11 @@ bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<CTxDestination>& addressRet, int& nRequiredRet)
{
addressRet.clear();
typeRet = TX_NONSTANDARD;
std::vector<valtype> vSolutions;
if (!Solver(scriptPubKey, typeRet, vSolutions))
typeRet = Solver(scriptPubKey, vSolutions);
if (typeRet == TX_NONSTANDARD) {
return false;
if (typeRet == TX_NULL_DATA){
} else if (typeRet == TX_NULL_DATA) {
// This is data, not addresses
return false;
}
@ -324,14 +311,12 @@ CScript GetScriptForMultisig(int nRequired, const std::vector<CPubKey>& keys)
CScript GetScriptForWitness(const CScript& redeemscript)
{
txnouttype typ;
std::vector<std::vector<unsigned char> > vSolutions;
if (Solver(redeemscript, typ, vSolutions)) {
if (typ == TX_PUBKEY) {
return GetScriptForDestination(WitnessV0KeyHash(Hash160(vSolutions[0].begin(), vSolutions[0].end())));
} else if (typ == TX_PUBKEYHASH) {
return GetScriptForDestination(WitnessV0KeyHash(vSolutions[0]));
}
txnouttype typ = Solver(redeemscript, vSolutions);
if (typ == TX_PUBKEY) {
return GetScriptForDestination(WitnessV0KeyHash(Hash160(vSolutions[0].begin(), vSolutions[0].end())));
} else if (typ == TX_PUBKEYHASH) {
return GetScriptForDestination(WitnessV0KeyHash(vSolutions[0]));
}
return GetScriptForDestination(WitnessV0ScriptHash(redeemscript));
}

5
src/script/standard.h
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@ -135,11 +135,10 @@ const char* GetTxnOutputType(txnouttype t);
* script hash, for P2PKH it will contain the key hash, etc.
*
* @param[in] scriptPubKey Script to parse
* @param[out] typeRet The script type
* @param[out] vSolutionsRet Vector of parsed pubkeys and hashes
* @return True if script matches standard template
* @return The script type. TX_NONSTANDARD represents a failed solve.
*/
bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, std::vector<std::vector<unsigned char> >& vSolutionsRet);
txnouttype Solver(const CScript& scriptPubKey, std::vector<std::vector<unsigned char>>& vSolutionsRet);
/**
* Parse a standard scriptPubKey for the destination address. Assigns result to

47
src/test/script_standard_tests.cpp
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@ -25,22 +25,19 @@ BOOST_AUTO_TEST_CASE(script_standard_Solver_success)
}
CScript s;
txnouttype whichType;
std::vector<std::vector<unsigned char> > solutions;
// TX_PUBKEY
s.clear();
s << ToByteVector(pubkeys[0]) << OP_CHECKSIG;
BOOST_CHECK(Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(whichType, TX_PUBKEY);
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_PUBKEY);
BOOST_CHECK_EQUAL(solutions.size(), 1U);
BOOST_CHECK(solutions[0] == ToByteVector(pubkeys[0]));
// TX_PUBKEYHASH
s.clear();
s << OP_DUP << OP_HASH160 << ToByteVector(pubkeys[0].GetID()) << OP_EQUALVERIFY << OP_CHECKSIG;
BOOST_CHECK(Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(whichType, TX_PUBKEYHASH);
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_PUBKEYHASH);
BOOST_CHECK_EQUAL(solutions.size(), 1U);
BOOST_CHECK(solutions[0] == ToByteVector(pubkeys[0].GetID()));
@ -48,8 +45,7 @@ BOOST_AUTO_TEST_CASE(script_standard_Solver_success)
CScript redeemScript(s); // initialize with leftover P2PKH script
s.clear();
s << OP_HASH160 << ToByteVector(CScriptID(redeemScript)) << OP_EQUAL;
BOOST_CHECK(Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(whichType, TX_SCRIPTHASH);
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_SCRIPTHASH);
BOOST_CHECK_EQUAL(solutions.size(), 1U);
BOOST_CHECK(solutions[0] == ToByteVector(CScriptID(redeemScript)));
@ -59,8 +55,7 @@ BOOST_AUTO_TEST_CASE(script_standard_Solver_success)
ToByteVector(pubkeys[0]) <<
ToByteVector(pubkeys[1]) <<
OP_2 << OP_CHECKMULTISIG;
BOOST_CHECK(Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(whichType, TX_MULTISIG);
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_MULTISIG);
BOOST_CHECK_EQUAL(solutions.size(), 4U);
BOOST_CHECK(solutions[0] == std::vector<unsigned char>({1}));
BOOST_CHECK(solutions[1] == ToByteVector(pubkeys[0]));
@ -73,8 +68,7 @@ BOOST_AUTO_TEST_CASE(script_standard_Solver_success)
ToByteVector(pubkeys[1]) <<
ToByteVector(pubkeys[2]) <<
OP_3 << OP_CHECKMULTISIG;
BOOST_CHECK(Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(whichType, TX_MULTISIG);
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_MULTISIG);
BOOST_CHECK_EQUAL(solutions.size(), 5U);
BOOST_CHECK(solutions[0] == std::vector<unsigned char>({2}));
BOOST_CHECK(solutions[1] == ToByteVector(pubkeys[0]));
@ -88,15 +82,13 @@ BOOST_AUTO_TEST_CASE(script_standard_Solver_success)
std::vector<unsigned char>({0}) <<
std::vector<unsigned char>({75}) <<
std::vector<unsigned char>({255});
BOOST_CHECK(Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(whichType, TX_NULL_DATA);
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NULL_DATA);
BOOST_CHECK_EQUAL(solutions.size(), 0U);
// TX_WITNESS_V0_KEYHASH
s.clear();
s << OP_0 << ToByteVector(pubkeys[0].GetID());
BOOST_CHECK(Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(whichType, TX_WITNESS_V0_KEYHASH);
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_WITNESS_V0_KEYHASH);
BOOST_CHECK_EQUAL(solutions.size(), 1U);
BOOST_CHECK(solutions[0] == ToByteVector(pubkeys[0].GetID()));
@ -107,16 +99,14 @@ BOOST_AUTO_TEST_CASE(script_standard_Solver_success)
s.clear();
s << OP_0 << ToByteVector(scriptHash);
BOOST_CHECK(Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(whichType, TX_WITNESS_V0_SCRIPTHASH);
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_WITNESS_V0_SCRIPTHASH);
BOOST_CHECK_EQUAL(solutions.size(), 1U);
BOOST_CHECK(solutions[0] == ToByteVector(scriptHash));
// TX_NONSTANDARD
s.clear();
s << OP_9 << OP_ADD << OP_11 << OP_EQUAL;
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(whichType, TX_NONSTANDARD);
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
}
BOOST_AUTO_TEST_CASE(script_standard_Solver_failure)
@ -127,53 +117,52 @@ BOOST_AUTO_TEST_CASE(script_standard_Solver_failure)
pubkey = key.GetPubKey();
CScript s;
txnouttype whichType;
std::vector<std::vector<unsigned char> > solutions;
// TX_PUBKEY with incorrectly sized pubkey
s.clear();
s << std::vector<unsigned char>(30, 0x01) << OP_CHECKSIG;
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
// TX_PUBKEYHASH with incorrectly sized key hash
s.clear();
s << OP_DUP << OP_HASH160 << ToByteVector(pubkey) << OP_EQUALVERIFY << OP_CHECKSIG;
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
// TX_SCRIPTHASH with incorrectly sized script hash
s.clear();
s << OP_HASH160 << std::vector<unsigned char>(21, 0x01) << OP_EQUAL;
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
// TX_MULTISIG 0/2
s.clear();
s << OP_0 << ToByteVector(pubkey) << OP_1 << OP_CHECKMULTISIG;
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
// TX_MULTISIG 2/1
s.clear();
s << OP_2 << ToByteVector(pubkey) << OP_1 << OP_CHECKMULTISIG;
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
// TX_MULTISIG n = 2 with 1 pubkey
s.clear();
s << OP_1 << ToByteVector(pubkey) << OP_2 << OP_CHECKMULTISIG;
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
// TX_MULTISIG n = 1 with 0 pubkeys
s.clear();
s << OP_1 << OP_1 << OP_CHECKMULTISIG;
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
// TX_NULL_DATA with other opcodes
s.clear();
s << OP_RETURN << std::vector<unsigned char>({75}) << OP_ADD;
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
// TX_WITNESS with incorrect program size
s.clear();
s << OP_0 << std::vector<unsigned char>(19, 0x01);
BOOST_CHECK(!Solver(s, whichType, solutions));
BOOST_CHECK_EQUAL(Solver(s, solutions), TX_NONSTANDARD);
}
BOOST_AUTO_TEST_CASE(script_standard_ExtractDestination)

3
src/wallet/rpcwallet.cpp
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@ -4021,9 +4021,8 @@ public:
void ProcessSubScript(const CScript& subscript, UniValue& obj, bool include_addresses = false) const
{
// Always present: script type and redeemscript
txnouttype which_type;
std::vector<std::vector<unsigned char>> solutions_data;
Solver(subscript, which_type, solutions_data);
txnouttype which_type = Solver(subscript, solutions_data);
obj.pushKV("script", GetTxnOutputType(which_type));
obj.pushKV("hex", HexStr(subscript.begin(), subscript.end()));

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