simplewallet: warn about correlations if print-ring-members is not set

The warning about spending more than one output with similar creation
time was skipped if print-ring-members was not set, and it defaults to
false, which means most people probably aren't getting this warning if
they spend correlated outputs.

Reported by SeventhAlpaca.

src/simplewallet/simplewallet.cpp

@@ -6064,11 +6064,14 @@ std::pair<std::string, std::string> simple_wallet::show_outputs_line(const std::
   return std::make_pair(ostr.str(), ring_str);
 }
 //----------------------------------------------------------------------------------------------------
-bool simple_wallet::print_ring_members(const std::vector<tools::wallet2::pending_tx>& ptx_vector, std::ostream& ostr)
+bool simple_wallet::process_ring_members(const std::vector<tools::wallet2::pending_tx>& ptx_vector, std::ostream& ostr, bool verbose)
 {
   uint32_t version;
   if (!try_connect_to_daemon(false, &version))
+  {
+    fail_msg_writer() << tr("failed to connect to daemon");
     return false;
+  }
   // available for RPC version 1.4 or higher
   if (version < MAKE_CORE_RPC_VERSION(1, 4))
     return true;
@@ -6084,7 +6087,8 @@ bool simple_wallet::print_ring_members(const std::vector<tools::wallet2::pending
   {
     const cryptonote::transaction& tx = ptx_vector[n].tx;
     const tools::wallet2::tx_construction_data& construction_data = ptx_vector[n].construction_data;
-    ostr << boost::format(tr("\nTransaction %llu/%llu: txid=%s")) % (n + 1) % ptx_vector.size() % cryptonote::get_transaction_hash(tx);
+    if (verbose)
+      ostr << boost::format(tr("\nTransaction %llu/%llu: txid=%s")) % (n + 1) % ptx_vector.size() % cryptonote::get_transaction_hash(tx);
     // for each input
     std::vector<uint64_t>     spent_key_height(tx.vin.size());
     std::vector<crypto::hash> spent_key_txid  (tx.vin.size());
@@ -6105,7 +6109,8 @@ bool simple_wallet::print_ring_members(const std::vector<tools::wallet2::pending
       }
       const cryptonote::tx_source_entry& source = *sptr;
 
-      ostr << boost::format(tr("\nInput %llu/%llu (%s): amount=%s")) % (i + 1) % tx.vin.size() % epee::string_tools::pod_to_hex(in_key.k_image) % print_money(source.amount);
+      if (verbose)
+        ostr << boost::format(tr("\nInput %llu/%llu (%s): amount=%s")) % (i + 1) % tx.vin.size() % epee::string_tools::pod_to_hex(in_key.k_image) % print_money(source.amount);
       // convert relative offsets of ring member keys into absolute offsets (indices) associated with the amount
       std::vector<uint64_t> absolute_offsets = cryptonote::relative_output_offsets_to_absolute(in_key.key_offsets);
       // get block heights from which those ring member keys originated
@@ -6135,7 +6140,8 @@ bool simple_wallet::print_ring_members(const std::vector<tools::wallet2::pending
           return false;
         }
       }
-      ostr << tr("\nOriginating block heights: ");
+      if (verbose)
+        ostr << tr("\nOriginating block heights: ");
       spent_key_height[i] = res.outs[source.real_output].height;
       spent_key_txid  [i] = res.outs[source.real_output].txid;
       std::vector<uint64_t> heights(absolute_offsets.size(), 0);
@@ -6144,7 +6150,8 @@ bool simple_wallet::print_ring_members(const std::vector<tools::wallet2::pending
         heights[j] = res.outs[j].height;
       }
       std::pair<std::string, std::string> ring_str = show_outputs_line(heights, blockchain_height, source.real_output);
-      ostr << ring_str.first << tr("\n|") << ring_str.second << tr("|\n");
+      if (verbose)
+        ostr << ring_str.first << tr("\n|") << ring_str.second << tr("|\n");
     }
     // warn if rings contain keys originating from the same tx or temporally very close block heights
     bool are_keys_from_same_tx      = false;
@@ -6163,7 +6170,7 @@ bool simple_wallet::print_ring_members(const std::vector<tools::wallet2::pending
       ostr
         << tr("\nWarning: Some input keys being spent are from ")
         << (are_keys_from_same_tx ? tr("the same transaction") : tr("blocks that are temporally very close"))
-        << tr(", which can break the anonymity of ring signature. Make sure this is intentional!");
+        << tr(", which can break the anonymity of ring signatures. Make sure this is intentional!");
     }
     ostr << ENDL;
   }
@@ -6604,11 +6611,8 @@ bool simple_wallet::transfer_main(int transfer_type, const std::vector<std::stri
           float days = locked_blocks / 720.0f;
           prompt << boost::format(tr(".\nThis transaction (including %s change) will unlock on block %llu, in approximately %s days (assuming 2 minutes per block)")) % cryptonote::print_money(change) % ((unsigned long long)unlock_block) % days;
         }
-        if (m_wallet->print_ring_members())
+        if (!process_ring_members(ptx_vector, prompt, m_wallet->print_ring_members()))
-        {
+          return false;
-          if (!print_ring_members(ptx_vector, prompt))
-            return false;
-        }
         bool default_ring_size = true;
         for (const auto &ptx: ptx_vector)
         {
@@ -7064,7 +7068,7 @@ bool simple_wallet::sweep_main(uint64_t below, bool locked, const std::vector<st
       if (subaddr_indices.size() > 1)
         prompt << tr("WARNING: Outputs of multiple addresses are being used together, which might potentially compromise your privacy.\n");
     }
-    if (m_wallet->print_ring_members() && !print_ring_members(ptx_vector, prompt))
+    if (!process_ring_members(ptx_vector, prompt, m_wallet->print_ring_members()))
       return true;
     if (ptx_vector.size() > 1) {
       prompt << boost::format(tr("Sweeping %s in %llu transactions for a total fee of %s.  Is this okay?")) %
@@ -7308,7 +7312,7 @@ bool simple_wallet::sweep_single(const std::vector<std::string> &args_)
     uint64_t total_fee = ptx_vector[0].fee;
     uint64_t total_sent = m_wallet->get_transfer_details(ptx_vector[0].selected_transfers.front()).amount();
     std::ostringstream prompt;
-    if (!print_ring_members(ptx_vector, prompt))
+    if (!process_ring_members(ptx_vector, prompt, m_wallet->print_ring_members()))
       return true;
     prompt << boost::format(tr("Sweeping %s for a total fee of %s.  Is this okay?")) %
       print_money(total_sent) %

src/simplewallet/simplewallet.h

@@ -270,7 +270,7 @@ namespace cryptonote
     bool accept_loaded_tx(const std::function<size_t()> get_num_txes, const std::function<const tools::wallet2::tx_construction_data&(size_t)> &get_tx, const std::string &extra_message = std::string());
     bool accept_loaded_tx(const tools::wallet2::unsigned_tx_set &txs);
     bool accept_loaded_tx(const tools::wallet2::signed_tx_set &txs);
-    bool print_ring_members(const std::vector<tools::wallet2::pending_tx>& ptx_vector, std::ostream& ostr);
+    bool process_ring_members(const std::vector<tools::wallet2::pending_tx>& ptx_vector, std::ostream& ostr, bool verbose);
     std::string get_prompt() const;
     bool print_seed(bool encrypted);
     void key_images_sync_intern();