Merge pull request #5487

df83ed7 consensus: from v12, enforce >= 2 outputs (moneromooo-monero)

7 files changed, 26 insertions, 0 deletions

diff --git a/src/cryptonote_basic/verification_context.h b/src/cryptonote_basic/verification_context.h
index 36b63f254..3d7200fae 100644
--- a/src/cryptonote_basic/verification_context.h
+++ b/src/cryptonote_basic/verification_context.h
@@ -48,6 +48,7 @@ namespace cryptonote
     bool m_overspend;
     bool m_fee_too_low;
     bool m_not_rct;
+    bool m_too_few_outputs;
   };
 
   struct block_verification_context
diff --git a/src/cryptonote_config.h b/src/cryptonote_config.h
index 56b6a63b7..fc718c4f7 100644
--- a/src/cryptonote_config.h
+++ b/src/cryptonote_config.h
@@ -147,6 +147,7 @@
 #define HF_VERSION_PER_BYTE_FEE                 8
 #define HF_VERSION_SMALLER_BP                   10
 #define HF_VERSION_LONG_TERM_BLOCK_WEIGHT       10
+#define HF_VERSION_MIN_2_OUTPUTS                12
 
 #define PER_KB_FEE_QUANTIZATION_DECIMALS        8
 
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 31e2ac136..7d173b2ff 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -2840,6 +2840,19 @@ bool Blockchain::check_tx_inputs(transaction& tx, tx_verification_context &tvc,
 
   const uint8_t hf_version = m_hardfork->get_current_version();
 
+  if (hf_version >= HF_VERSION_MIN_2_OUTPUTS)
+  {
+    if (tx.version >= 2)
+    {
+      if (tx.vout.size() < 2)
+      {
+        MERROR_VER("Tx " << get_transaction_hash(tx) << " has fewer than two outputs");
+        tvc.m_too_few_outputs = true;
+        return false;
+      }
+    }
+  }
+
   // from hard fork 2, we require mixin at least 2 unless one output cannot mix with 2 others
   // if one output cannot mix with 2 others, we accept at most 1 output that can mix
   if (hf_version >= 2)
diff --git a/src/rpc/core_rpc_server.cpp b/src/rpc/core_rpc_server.cpp
index dd7201623..d5d173ab2 100644
--- a/src/rpc/core_rpc_server.cpp
+++ b/src/rpc/core_rpc_server.cpp
@@ -864,6 +864,8 @@ namespace cryptonote
         add_reason(reason, "fee too low");
       if ((res.not_rct = tvc.m_not_rct))
         add_reason(reason, "tx is not ringct");
+      if ((res.too_few_outputs = tvc.m_too_few_outputs))
+        add_reason(reason, "too few outputs");
       const std::string punctuation = reason.empty() ? "" : ": ";
       if (tvc.m_verifivation_failed)
       {
diff --git a/src/rpc/core_rpc_server_commands_defs.h b/src/rpc/core_rpc_server_commands_defs.h
index 7f4556c97..faf61a7f8 100644
--- a/src/rpc/core_rpc_server_commands_defs.h
+++ b/src/rpc/core_rpc_server_commands_defs.h
@@ -612,6 +612,7 @@ namespace cryptonote
       bool overspend;
       bool fee_too_low;
       bool not_rct;
+      bool too_few_outputs;
       bool sanity_check_failed;
       bool untrusted;
 
@@ -627,6 +628,7 @@ namespace cryptonote
         KV_SERIALIZE(overspend)
         KV_SERIALIZE(fee_too_low)
         KV_SERIALIZE(not_rct)
+        KV_SERIALIZE(too_few_outputs)
         KV_SERIALIZE(sanity_check_failed)
         KV_SERIALIZE(untrusted)
       END_KV_SERIALIZE_MAP()
diff --git a/src/rpc/daemon_handler.cpp b/src/rpc/daemon_handler.cpp
index 612b2cab6..890380dc8 100644
--- a/src/rpc/daemon_handler.cpp
+++ b/src/rpc/daemon_handler.cpp
@@ -343,6 +343,11 @@ namespace rpc
         if (!res.error_details.empty()) res.error_details += " and ";
         res.error_details = "tx is not ringct";
       }
+      if (tvc.m_too_few_outputs)
+      {
+        if (!res.error_details.empty()) res.error_details += " and ";
+        res.error_details = "too few outputs";
+      }
       if (res.error_details.empty())
       {
         res.error_details = "an unknown issue was found with the transaction";
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index f25e9ad97..e44fea7d7 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -217,6 +217,8 @@ namespace
         add_reason(reason, "invalid input");
       if (res.invalid_output)
         add_reason(reason, "invalid output");
+      if (res.too_few_outputs)
+        add_reason(reason, "too few outputs");
       if (res.too_big)
         add_reason(reason, "too big");
       if (res.overspend)