From 22de68dffc1e94c5b06b7e512140c42290cb4f5d Mon Sep 17 00:00:00 2001
From: Peter Todd <pete@petertodd.org>
Date: Thu, 24 Oct 2013 04:32:35 -0400
Subject: [PATCH] Relay OP_RETURN TxOut as standard transaction type

Also fix decoderawtransaction to not show reqSigs or addresses for
nulldata txouts. (Previous version also left reqSigs uninitialized
mistakenly)
---
 src/rpcrawtransaction.cpp      |  2 +-
 src/script.cpp                 | 12 +++++++-----
 src/test/transaction_tests.cpp | 15 ++++++++++++++-
 3 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/src/rpcrawtransaction.cpp b/src/rpcrawtransaction.cpp
index d5bd39cb4d..cb571947a9 100644
--- a/src/rpcrawtransaction.cpp
+++ b/src/rpcrawtransaction.cpp
@@ -29,7 +29,7 @@ void ScriptPubKeyToJSON(const CScript& scriptPubKey, Object& out, bool fIncludeH
 
     if (!ExtractDestinations(scriptPubKey, type, addresses, nRequired))
     {
-        out.push_back(Pair("type", GetTxnOutputType(TX_NONSTANDARD)));
+        out.push_back(Pair("type", GetTxnOutputType(type)));
         return;
     }
 
diff --git a/src/script.cpp b/src/script.cpp
index 63f632795a..ec9e9d61de 100644
--- a/src/script.cpp
+++ b/src/script.cpp
@@ -1195,7 +1195,7 @@ bool CheckSig(vector<unsigned char> vchSig, const vector<unsigned char> &vchPubK
 bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsigned char> >& vSolutionsRet)
 {
     // Templates
-    static map<txnouttype, CScript> mTemplates;
+    static multimap<txnouttype, CScript> mTemplates;
     if (mTemplates.empty())
     {
         // Standard tx, sender provides pubkey, receiver adds signature
@@ -1209,6 +1209,7 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
 
         // Empty, provably prunable, data-carrying output
         mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN << OP_SMALLDATA));
+        mTemplates.insert(make_pair(TX_NULL_DATA, CScript() << OP_RETURN));
     }
 
     // Shortcut for pay-to-script-hash, which are more constrained than the other types:
@@ -1392,9 +1393,8 @@ int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned c
     switch (t)
     {
     case TX_NONSTANDARD:
-        return -1;
     case TX_NULL_DATA:
-        return 1;
+        return -1;
     case TX_PUBKEY:
         return 1;
     case TX_PUBKEYHASH:
@@ -1532,8 +1532,10 @@ bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, vecto
     vector<valtype> vSolutions;
     if (!Solver(scriptPubKey, typeRet, vSolutions))
         return false;
-    if (typeRet == TX_NULL_DATA)
-        return true;
+    if (typeRet == TX_NULL_DATA){
+        // This is data, not addresses
+        return false;
+    }
 
     if (typeRet == TX_MULTISIG)
     {
diff --git a/src/test/transaction_tests.cpp b/src/test/transaction_tests.cpp
index d68ead1cd0..c6bc2e8aa1 100644
--- a/src/test/transaction_tests.cpp
+++ b/src/test/transaction_tests.cpp
@@ -282,11 +282,24 @@ BOOST_AUTO_TEST_CASE(test_IsStandard)
     t.vout[0].scriptPubKey = CScript() << OP_RETURN << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3804678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3800");
     BOOST_CHECK(!IsStandardTx(t, reason));
 
-    // Only one TX_NULL_DATA permitted
+    // TX_NULL_DATA w/o PUSHDATA
+    t.vout.resize(1);
+    t.vout[0].scriptPubKey = CScript() << OP_RETURN;
+    BOOST_CHECK(IsStandardTx(t, reason));
+
+    // Only one TX_NULL_DATA permitted in all cases
     t.vout.resize(2);
     t.vout[0].scriptPubKey = CScript() << OP_RETURN << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3804678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38");
     t.vout[1].scriptPubKey = CScript() << OP_RETURN << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3804678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38");
     BOOST_CHECK(!IsStandardTx(t, reason));
+
+    t.vout[0].scriptPubKey = CScript() << OP_RETURN << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3804678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38");
+    t.vout[1].scriptPubKey = CScript() << OP_RETURN;
+    BOOST_CHECK(!IsStandardTx(t, reason));
+
+    t.vout[0].scriptPubKey = CScript() << OP_RETURN;
+    t.vout[1].scriptPubKey = CScript() << OP_RETURN;
+    BOOST_CHECK(!IsStandardTx(t, reason));
 }
 
 BOOST_AUTO_TEST_SUITE_END()