from hard fork 2, all outputs must be decomposed

The wallet decomposes fully as of now too.

src/cryptonote_core/blockchain.cpp

@@ -1972,6 +1972,23 @@ bool Blockchain::check_tx_inputs(const transaction& tx, uint64_t& max_used_block
     return true;
 }
 //------------------------------------------------------------------
+bool Blockchain::check_tx_outputs(const transaction& tx)
+{
+    LOG_PRINT_L3("Blockchain::" << __func__);
+    CRITICAL_REGION_LOCAL(m_blockchain_lock);
+
+    // from hard fork 2, we forbid dust and compound outputs
+    if (m_hardfork->get_current_version() >= 2) {
+      BOOST_FOREACH(auto &o, tx.vout) {
+        if (!is_valid_decomposed_amount(o.amount)) {
+          return false;
+        }
+      }
+    }
+
+    return true;
+}
+//------------------------------------------------------------------
 bool Blockchain::have_tx_keyimges_as_spent(const transaction &tx) const
 {
     LOG_PRINT_L3("Blockchain::" << __func__);

src/cryptonote_core/blockchain.h

@@ -134,6 +134,7 @@ namespace cryptonote
     bool store_blockchain();
 
     bool check_tx_inputs(const transaction& tx, uint64_t& pmax_used_block_height, crypto::hash& max_used_block_id, bool kept_by_block = false);
+    bool check_tx_outputs(const transaction& tx);
     uint64_t get_current_cumulative_blocksize_limit() const;
     bool is_storing_blockchain()const{return m_is_blockchain_storing;}
     uint64_t block_difficulty(uint64_t i) const;

src/cryptonote_core/cryptonote_format_utils.cpp

@@ -141,7 +141,7 @@ namespace cryptonote
     block_reward += fee;
 
     std::vector<uint64_t> out_amounts;
-    decompose_amount_into_digits(block_reward, ::config::DEFAULT_DUST_THRESHOLD,
+    decompose_amount_into_digits(block_reward, hard_fork_version >= 2 ? 0 : ::config::DEFAULT_DUST_THRESHOLD,
       [&out_amounts](uint64_t a_chunk) { out_amounts.push_back(a_chunk); },
       [&out_amounts](uint64_t a_dust) { out_amounts.push_back(a_dust); });
 

src/cryptonote_core/tx_pool.cpp

@@ -125,6 +125,12 @@ namespace cryptonote
       }
     }
 
+    if (!m_blockchain.check_tx_outputs(tx))
+    {
+      LOG_PRINT_L1("Transaction with id= "<< id << " has at least one invalid outout");
+      tvc.m_verifivation_failed = true;
+      return false;
+    }
 
     crypto::hash max_used_block_id = null_hash;
     uint64_t max_used_block_height = 0;