Make sure Transaction constructor checks sender whereever it makes sense

(which is pretty much everywhere).

alethzero/MainWin.cpp

@@ -1097,7 +1097,7 @@ void Main::refreshBlockChain()
 		auto b = bc.block(h);
 		for (auto const& i: RLP(b)[1])
 		{
-			Transaction t(i.data());
+			Transaction t(i.data(), CheckSignature::Sender);
 			if (bm || transactionMatch(filter, t))
 			{
 				QString s = t.receiveAddress() ?
@@ -1385,7 +1385,7 @@ void Main::on_blocks_currentItemChanged()
 		else
 		{
 			unsigned txi = item->data(Qt::UserRole + 1).toInt();
-			Transaction tx(block[1][txi].data());
+			Transaction tx(block[1][txi].data(), CheckSignature::Sender);
 			auto ss = tx.safeSender();
 			h256 th = sha3(rlpList(ss, tx.nonce()));
 			TransactionReceipt receipt = ethereum()->blockChain().receipts(h).receipts[txi];
@@ -1648,13 +1648,18 @@ static shh::Topic topicFromText(QString _s)
 	return ret;
 }
 
-
 bool Main::sourceIsSolidity(string const& _source)
 {
 	// TODO: Improve this heuristic
 	return (_source.substr(0, 8) == "contract" || _source.substr(0, 5) == "//sol");
 }
 
+static bool sourceIsSerpent(string const& _source)
+{
+	// TODO: Improve this heuristic
+	return (_source.substr(0, 5) == "//ser");
+}
+
 string const Main::getFunctionHashes(dev::solidity::CompilerStack const &_compiler,
 									 string const& _contractName)
 {
@@ -1689,6 +1694,7 @@ void Main::on_data_textChanged()
 			dev::solidity::CompilerStack compiler;
 			try
 			{
+//				compiler.addSources(dev::solidity::StandardSources);
 				m_data = compiler.compile(src, m_enableOptimizer);
 				solidity = "<h4>Solidity</h4>";
 				solidity += "<pre>" + QString::fromStdString(compiler.getInterface()).replace(QRegExp("\\s"), "").toHtmlEscaped() + "</pre>";
@@ -1706,10 +1712,7 @@ void Main::on_data_textChanged()
 				solidity = "<h4>Solidity</h4><pre>Uncaught exception.</pre>";
 			}
 		}
-		else
-		{
-			m_data = compileLLL(src, m_enableOptimizer, &errors);
-			if (errors.size())
+		else if (sourceIsSerpent(src))
 		{
 			try
 			{
@@ -1723,6 +1726,9 @@ void Main::on_data_textChanged()
 			}
 		}
 		else
+		{
+			m_data = compileLLL(src, m_enableOptimizer, &errors);
+			if (errors.empty())
 			{
 				auto asmcode = compileLLLToAsm(src, false);
 				lll = "<h4>Pre</h4><pre>" + QString::fromStdString(asmcode).toHtmlEscaped() + "</pre>";

libethereum/Client.cpp

@@ -642,7 +642,7 @@ Transaction Client::transaction(h256 _blockHash, unsigned _i) const
 {
 	auto bl = m_bc.block(_blockHash);
 	RLP b(bl);
-	return Transaction(b[1][_i].data());
+	return Transaction(b[1][_i].data(), CheckSignature::Range);
 }
 
 BlockInfo Client::uncle(h256 _blockHash, unsigned _i) const

libethereum/Executive.cpp

@@ -53,7 +53,7 @@ void Executive::accrueSubState(SubState& _parentContext)
 bool Executive::setup(bytesConstRef _rlp)
 {
 	// Entry point for a user-executed transaction.
-	m_t = Transaction(_rlp);
+	m_t = Transaction(_rlp, CheckSignature::Sender);
 
 	// Avoid invalid transactions.
 	auto nonceReq = m_s.transactionsFrom(m_t.sender());

libethereum/State.cpp

@@ -395,7 +395,7 @@ bool State::cull(TransactionQueue& _tq) const
 		{
 			try
 			{
-				Transaction t(i.second);
+				Transaction t(i.second, CheckSignature::Sender);
 				if (t.nonce() <= transactionsFrom(t.sender()))
 				{
 					_tq.drop(i.first);

libethereum/Transaction.cpp

@@ -30,7 +30,7 @@ using namespace dev::eth;
 
 #define ETH_ADDRESS_DEBUG 0
 
-Transaction::Transaction(bytesConstRef _rlpData, bool _checkSender)
+Transaction::Transaction(bytesConstRef _rlpData, CheckSignature _checkSig)
 {
 	int field = 0;
 	RLP rlp(_rlpData);
@@ -47,7 +47,9 @@ Transaction::Transaction(bytesConstRef _rlpData, bool _checkSender)
 		h256 r = rlp[field = 7].toInt<u256>();
 		h256 s = rlp[field = 8].toInt<u256>();
 		m_vrs = SignatureStruct{ r, s, v };
-		if (_checkSender)
+		if (_checkSig >= CheckSignature::Range && !m_vrs.isValid())
+			BOOST_THROW_EXCEPTION(InvalidSignature());
+		if (_checkSig == CheckSignature::Sender)
 			m_sender = sender();
 	}
 	catch (Exception& _e)

libethereum/Transaction.h

@@ -37,6 +37,13 @@ enum IncludeSignature
 	WithSignature = 1,		///< Do include a signature.
 };
 
+enum class CheckSignature
+{
+	None,
+	Range,
+	Sender
+};
+
 /// Encodes a transaction, ready to be exported to or freshly imported from RLP.
 class Transaction
 {
@@ -57,10 +64,10 @@ public:
 	Transaction(u256 _value, u256 _gasPrice, u256 _gas, bytes const& _data): m_type(ContractCreation), m_value(_value), m_gasPrice(_gasPrice), m_gas(_gas), m_data(_data) {}
 
 	/// Constructs a transaction from the given RLP.
-	explicit Transaction(bytesConstRef _rlp, bool _checkSender = false);
+	explicit Transaction(bytesConstRef _rlp, CheckSignature _checkSig);
 
 	/// Constructs a transaction from the given RLP.
-	explicit Transaction(bytes const& _rlp, bool _checkSender = false): Transaction(&_rlp, _checkSender) {}
+	explicit Transaction(bytes const& _rlp, CheckSignature _checkSig): Transaction(&_rlp, _checkSig) {}
 
 
 	/// Checks equality of transactions.

libethereum/TransactionQueue.cpp

@@ -42,7 +42,7 @@ bool TransactionQueue::import(bytesConstRef _transactionRLP)
 		// Check validity of _transactionRLP as a transaction. To do this we just deserialise and attempt to determine the sender.
 		// If it doesn't work, the signature is bad.
 		// The transaction's nonce may yet be invalid (or, it could be "valid" but we may be missing a marginally older transaction).
-		Transaction t(_transactionRLP, true);
+		Transaction t(_transactionRLP, CheckSignature::Sender);
 
 		UpgradeGuard ul(l);
 		// If valid, append to blocks.
@@ -69,14 +69,14 @@ void TransactionQueue::setFuture(std::pair<h256, bytes> const& _t)
 	if (m_current.count(_t.first))
 	{
 		m_current.erase(_t.first);
-		m_unknown.insert(make_pair(Transaction(_t.second).sender(), _t));
+		m_unknown.insert(make_pair(Transaction(_t.second, CheckSignature::Sender).sender(), _t));
 	}
 }
 
 void TransactionQueue::noteGood(std::pair<h256, bytes> const& _t)
 {
 	WriteGuard l(m_lock);
-	auto r = m_unknown.equal_range(Transaction(_t.second).sender());
+	auto r = m_unknown.equal_range(Transaction(_t.second, CheckSignature::Sender).sender());
 	for (auto it = r.first; it != r.second; ++it)
 		m_current.insert(it->second);
 	m_unknown.erase(r.first, r.second);

neth/main.cpp

@@ -886,7 +886,7 @@ int main(int argc, char** argv)
 			auto b = bc.block(h);
 			for (auto const& i: RLP(b)[1])
 			{
-				Transaction t(i.data());
+				Transaction t(i.data(), CheckSignature::Sender);
 				auto s = t.receiveAddress() ?
 					boost::format("  %1% %2%> %3%: %4% [%5%]") %
 						toString(t.safeSender()) %