wallet: add an output blackball list to avoid using those in rings

6 files changed, 297 insertions, 8 deletions

diff --git a/src/simplewallet/simplewallet.cpp b/src/simplewallet/simplewallet.cpp
index 698ecced8..315d91aa6 100644
--- a/src/simplewallet/simplewallet.cpp
+++ b/src/simplewallet/simplewallet.cpp
@@ -1332,6 +1332,135 @@ bool simple_wallet::print_ring(const std::vector<std::string> &args)
   return true;
 }
 
+bool simple_wallet::blackball(const std::vector<std::string> &args)
+{
+  crypto::public_key output;
+  if (args.size() == 0)
+  {
+    fail_msg_writer() << tr("usage: blackball <output_public_key> | <filename> [add]");
+    return true;
+  }
+
+  try
+  {
+    if (epee::string_tools::hex_to_pod(args[0], output))
+    {
+      m_wallet->blackball_output(output);
+    }
+    else if (epee::file_io_utils::is_file_exist(args[0]))
+    {
+      std::vector<crypto::public_key> outputs;
+      char str[65];
+
+      std::unique_ptr<FILE, tools::close_file> f(fopen(args[0].c_str(), "r"));
+      if (f)
+      {
+        while (!feof(f.get()))
+        {
+          if (!fgets(str, sizeof(str), f.get()))
+            break;
+          const size_t len = strlen(str);
+          if (len > 0 && str[len - 1] == '\n')
+            str[len - 1] = 0;
+          if (!str[0])
+            continue;
+          outputs.push_back(crypto::public_key());
+          if (!epee::string_tools::hex_to_pod(str, outputs.back()))
+          {
+            fail_msg_writer() << tr("Invalid public key: ") << str;
+            return true;
+          }
+        }
+        f.reset();
+        bool add = false;
+        if (args.size() > 1)
+        {
+          if (args[1] != "add")
+          {
+            fail_msg_writer() << tr("Bad argument: ") + args[1] + ": " + tr("should be \"add\"");
+            return true;
+          }
+          add = true;
+        }
+        m_wallet->set_blackballed_outputs(outputs, add);
+      }
+      else
+      {
+        fail_msg_writer() << tr("Failed to open file");
+        return true;
+      }
+    }
+    else
+    {
+      fail_msg_writer() << tr("Invalid public key, and file doesn't exist");
+      return true;
+    }
+  }
+  catch (const std::exception &e)
+  {
+    fail_msg_writer() << tr("Failed to blackball output: ") << e.what();
+  }
+
+  return true;
+}
+
+bool simple_wallet::unblackball(const std::vector<std::string> &args)
+{
+  crypto::public_key output;
+  if (args.size() != 1)
+  {
+    fail_msg_writer() << tr("usage: unblackball <output_public_key>");
+    return true;
+  }
+
+  if (!epee::string_tools::hex_to_pod(args[0], output))
+  {
+    fail_msg_writer() << tr("Invalid public key");
+    return true;
+  }
+
+  try
+  {
+    m_wallet->unblackball_output(output);
+  }
+  catch (const std::exception &e)
+  {
+    fail_msg_writer() << tr("Failed to unblackball output: ") << e.what();
+  }
+
+  return true;
+}
+
+bool simple_wallet::blackballed(const std::vector<std::string> &args)
+{
+  crypto::public_key output;
+  if (args.size() != 1)
+  {
+    fail_msg_writer() << tr("usage: blackballed <output_public_key>");
+    return true;
+  }
+
+  if (!epee::string_tools::hex_to_pod(args[0], output))
+  {
+    fail_msg_writer() << tr("Invalid public key");
+    return true;
+  }
+
+  try
+  {
+    if (m_wallet->is_output_blackballed(output))
+      message_writer() << tr("Blackballed: ") << output;
+    else
+      message_writer() << tr("not blackballed: ") << output;
+  }
+  catch (const std::exception &e)
+  {
+    fail_msg_writer() << tr("Failed to unblackball output: ") << e.what();
+  }
+
+  return true;
+}
+
 bool simple_wallet::save_known_rings(const std::vector<std::string> &args)
 {
   try
@@ -2041,6 +2170,18 @@ simple_wallet::simple_wallet()
                            boost::bind(&simple_wallet::save_known_rings, this, _1),
                            tr("save_known_rings"),
                            tr("Save known rings to the shared rings database"));
+  m_cmd_binder.set_handler("blackball",
+                           boost::bind(&simple_wallet::blackball, this, _1),
+                           tr("blackball <output public key> | <filename> [add]"),
+                           tr("Blackball output(s) so they never get selected as fake outputs in a ring"));
+  m_cmd_binder.set_handler("unblackball",
+                           boost::bind(&simple_wallet::unblackball, this, _1),
+                           tr("unblackball <output public key>"),
+                           tr("Unblackballs an output so it may get selected as a fake output in a ring"));
+  m_cmd_binder.set_handler("blackballed",
+                           boost::bind(&simple_wallet::blackballed, this, _1),
+                           tr("blackballed <output public key>"),
+                           tr("Checks whether an output is blackballed"));
   m_cmd_binder.set_handler("help",
                            boost::bind(&simple_wallet::help, this, _1),
                            tr("help [<command>]"),
diff --git a/src/simplewallet/simplewallet.h b/src/simplewallet/simplewallet.h
index 9846c82f3..372057022 100644
--- a/src/simplewallet/simplewallet.h
+++ b/src/simplewallet/simplewallet.h
@@ -212,6 +212,9 @@ namespace cryptonote
     bool export_raw_multisig(const std::vector<std::string>& args);
     bool print_ring(const std::vector<std::string>& args);
     bool save_known_rings(const std::vector<std::string>& args);
+    bool blackball(const std::vector<std::string>& args);
+    bool unblackball(const std::vector<std::string>& args);
+    bool blackballed(const std::vector<std::string>& args);
 
     uint64_t get_daemon_blockchain_height(std::string& err);
     bool try_connect_to_daemon(bool silent = false, uint32_t* version = nullptr);
diff --git a/src/wallet/ringdb.cpp b/src/wallet/ringdb.cpp
index 5ea8c5fec..198312dc4 100644
--- a/src/wallet/ringdb.cpp
+++ b/src/wallet/ringdb.cpp
@@ -38,6 +38,9 @@
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "wallet.ringdb"
 
+static const char zerokey[8] = {0};
+static const MDB_val zerokeyval = { sizeof(zerokey), (void *)zerokey };
+
 static int compare_hash32(const MDB_val *a, const MDB_val *b)
 {
   uint32_t *va = (uint32_t*) a->mv_data;
@@ -123,12 +126,14 @@ static std::string decrypt(const std::string &ciphertext, const crypto::key_imag
   return plaintext;
 }
 
-static int resize_env(MDB_env *env, const char *db_path, size_t n_entries)
+static int resize_env(MDB_env *env, const char *db_path, size_t needed)
 {
   MDB_envinfo mei;
   MDB_stat mst;
   int ret;
 
+  needed = std::max(needed, (size_t)(2ul * 1024 * 1024)); // at least 2 MB
+
   ret = mdb_env_info(env, &mei);
   if (ret)
     return ret;
@@ -136,7 +141,6 @@ static int resize_env(MDB_env *env, const char *db_path, size_t n_entries)
   if (ret)
     return ret;
   uint64_t size_used = mst.ms_psize * mei.me_last_pgno;
-  const size_t needed = n_entries * (32 + 1024); // highball 1kB for the ring data to make sure
   uint64_t mapsize = mei.me_mapsize;
   if (size_used + needed > mei.me_mapsize)
   {
@@ -161,6 +165,90 @@ static int resize_env(MDB_env *env, const char *db_path, size_t n_entries)
   return mdb_env_set_mapsize(env, mapsize);
 }
 
+static size_t get_ring_data_size(size_t n_entries)
+{
+  return n_entries * (32 + 1024); // highball 1kB for the ring data to make sure
+}
+
+enum { BLACKBALL_BLACKBALL, BLACKBALL_UNBLACKBALL, BLACKBALL_QUERY, BLACKBALL_CLEAR};
+
+static bool blackball_worker(const std::string &filename, const crypto::public_key &output, int op)
+{
+  MDB_env *env;
+  MDB_dbi dbi;
+  MDB_txn *txn;
+  MDB_cursor *cursor;
+  int dbr;
+  bool tx_active = false;
+  bool ret = true;
+
+  if (filename.empty())
+    return true;
+  tools::create_directories_if_necessary(filename);
+
+  dbr = mdb_env_create(&env);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LDMB environment: " + std::string(mdb_strerror(dbr)));
+  dbr = mdb_env_set_maxdbs(env, 1);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set max env dbs: " + std::string(mdb_strerror(dbr)));
+  dbr = mdb_env_open(env, get_rings_filename(filename).c_str(), 0, 0664);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file: " + std::string(mdb_strerror(dbr)));
+  epee::misc_utils::auto_scope_leave_caller env_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_env_close(env);});
+  dbr = resize_env(env, filename.c_str(), 32 * 2); // a pubkey, and some slack
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
+  dbr = mdb_txn_begin(env, NULL, 0, &txn);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
+  epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
+  tx_active = true;
+  dbr = mdb_dbi_open(txn, "blackballs", MDB_CREATE | MDB_INTEGERKEY | MDB_DUPSORT | MDB_DUPFIXED, &dbi);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open LMDB dbi: " + std::string(mdb_strerror(dbr)));
+  epee::misc_utils::auto_scope_leave_caller dbi_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_dbi_close(env, dbi);});
+  mdb_set_dupsort(txn, dbi, compare_hash32);
+
+  MDB_val key = zerokeyval;
+  MDB_val data;
+  data.mv_data = (void*)&output;
+  data.mv_size = sizeof(output);
+
+  switch (op)
+  {
+    case BLACKBALL_BLACKBALL:
+      MDEBUG("Blackballing output " << output);
+      dbr = mdb_put(txn, dbi, &key, &data, MDB_NODUPDATA);
+      if (dbr == MDB_KEYEXIST)
+        dbr = 0;
+      break;
+    case BLACKBALL_UNBLACKBALL:
+      MDEBUG("Unblackballing output " << output);
+      dbr = mdb_del(txn, dbi, &key, &data);
+      if (dbr == MDB_NOTFOUND)
+        dbr = 0;
+      break;
+    case BLACKBALL_QUERY:
+      MDEBUG("Querying blackball status for output " << output);
+      dbr = mdb_cursor_open(txn, dbi, &cursor);
+      THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create cursor for blackballs table: " + std::string(mdb_strerror(dbr)));
+      dbr = mdb_cursor_get(cursor, &key, &data, MDB_GET_BOTH);
+      MDEBUG("Querying blackball status for output " << output << ": " << std::string(mdb_strerror(dbr)));
+      THROW_WALLET_EXCEPTION_IF(dbr && dbr != MDB_NOTFOUND, tools::error::wallet_internal_error, "Failed to lookup in blackballs table: " + std::string(mdb_strerror(dbr)));
+      ret = dbr != MDB_NOTFOUND;
+      if (dbr == MDB_NOTFOUND)
+        dbr = 0;
+      mdb_cursor_close(cursor);
+      break;
+    case BLACKBALL_CLEAR:
+      dbr = mdb_drop(txn, dbi, 0);
+      break;
+    default:
+      THROW_WALLET_EXCEPTION(tools::error::wallet_internal_error, "Invalid blackball op");
+  }
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to query blackballs table: " + std::string(mdb_strerror(dbr)));
+
+  dbr = mdb_txn_commit(txn);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to commit txn blackballing output to database: " + std::string(mdb_strerror(dbr)));
+  tx_active = false;
+  return ret;
+}
+
 namespace tools { namespace ringdb
 {
 
@@ -183,8 +271,8 @@ bool add_rings(const std::string &filename, const crypto::chacha_key &chacha_key
   dbr = mdb_env_open(env, get_rings_filename(filename).c_str(), 0, 0664);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file: " + std::string(mdb_strerror(dbr)));
   epee::misc_utils::auto_scope_leave_caller env_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_env_close(env);});
-  dbr = resize_env(env, filename.c_str(), tx.vin.size());
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
+  dbr = resize_env(env, filename.c_str(), get_ring_data_size(tx.vin.size()));
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size");
   dbr = mdb_txn_begin(env, NULL, 0, &txn);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
   epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
@@ -242,8 +330,8 @@ bool remove_rings(const std::string &filename, const crypto::chacha_key &chacha_
   dbr = mdb_env_open(env, get_rings_filename(filename).c_str(), 0, 0664);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to open rings database file: " + std::string(mdb_strerror(dbr)));
   epee::misc_utils::auto_scope_leave_caller env_dtor = epee::misc_utils::create_scope_leave_handler([&](){mdb_env_close(env);});
-  dbr = resize_env(env, filename.c_str(), tx.vin.size());
-  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size: " + std::string(mdb_strerror(dbr)));
+  dbr = resize_env(env, filename.c_str(), 0);
+  THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to set env map size");
   dbr = mdb_txn_begin(env, NULL, 0, &txn);
   THROW_WALLET_EXCEPTION_IF(dbr, tools::error::wallet_internal_error, "Failed to create LMDB transaction: " + std::string(mdb_strerror(dbr)));
   epee::misc_utils::auto_scope_leave_caller txn_dtor = epee::misc_utils::create_scope_leave_handler([&](){if (tx_active) mdb_txn_abort(txn);});
@@ -337,4 +425,24 @@ bool get_ring(const std::string &filename, const crypto::chacha_key &chacha_key,
   return true;
 }
 
+bool blackball(const std::string &filename, const crypto::public_key &output)
+{
+  return blackball_worker(filename, output, BLACKBALL_BLACKBALL);
+}
+
+bool unblackball(const std::string &filename, const crypto::public_key &output)
+{
+  return blackball_worker(filename, output, BLACKBALL_UNBLACKBALL);
+}
+
+bool blackballed(const std::string &filename, const crypto::public_key &output)
+{
+  return blackball_worker(filename, output, BLACKBALL_QUERY);
+}
+
+bool clear_blackballs(const std::string &filename)
+{
+  return blackball_worker(filename, crypto::public_key(), BLACKBALL_CLEAR);
+}
+
 }}
diff --git a/src/wallet/ringdb.h b/src/wallet/ringdb.h
index 3edb57804..5aea47075 100644
--- a/src/wallet/ringdb.h
+++ b/src/wallet/ringdb.h
@@ -41,5 +41,10 @@ namespace tools
     bool add_rings(const std::string &filename, const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
     bool remove_rings(const std::string &filename, const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
     bool get_ring(const std::string &filename, const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, std::vector<uint64_t> &outs);
+
+    bool blackball(const std::string &filename, const crypto::public_key &output);
+    bool unblackball(const std::string &filename, const crypto::public_key &output);
+    bool blackballed(const std::string &filename, const crypto::public_key &output);
+    bool clear_blackballs(const std::string &filename);
   }
 }
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 6c71a81db..9cdb842ca 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -5541,16 +5541,43 @@ bool wallet2::find_and_save_rings(const std::string &filename, bool force)
   return true;
 }
 
-bool wallet2::tx_add_fake_output(std::vector<std::vector<tools::wallet2::get_outs_entry>> &outs, uint64_t global_index, const crypto::public_key& tx_public_key, const rct::key& mask, uint64_t real_index, bool unlocked) const
+bool wallet2::blackball_output(const crypto::public_key &output)
+{
+  return ringdb::blackball(get_ring_database(), output);
+}
+
+bool wallet2::set_blackballed_outputs(const std::vector<crypto::public_key> &outputs, bool add)
+{
+  bool ret = true;
+  if (!add)
+    ret &= ringdb::clear_blackballs(get_ring_database());
+  for (const auto &output: outputs)
+    ret &= ringdb::blackball(get_ring_database(), output);
+  return ret;
+}
+
+bool wallet2::unblackball_output(const crypto::public_key &output)
+{
+  return ringdb::unblackball(get_ring_database(), output);
+}
+
+bool wallet2::is_output_blackballed(const crypto::public_key &output) const
+{
+  return ringdb::blackballed(get_ring_database(), output);
+}
+
+bool wallet2::tx_add_fake_output(std::vector<std::vector<tools::wallet2::get_outs_entry>> &outs, uint64_t global_index, const crypto::public_key& output_public_key, const rct::key& mask, uint64_t real_index, bool unlocked) const
 {
   if (!unlocked) // don't add locked outs
     return false;
   if (global_index == real_index) // don't re-add real one
     return false;
-  auto item = std::make_tuple(global_index, tx_public_key, mask);
+  auto item = std::make_tuple(global_index, output_public_key, mask);
   CHECK_AND_ASSERT_MES(!outs.empty(), false, "internal error: outs is empty");
   if (std::find(outs.back().begin(), outs.back().end(), item) != outs.back().end()) // don't add duplicates
     return false;
+  if (is_output_blackballed(output_public_key)) // don't add blackballed outputs
+    return false;
   outs.back().push_back(item);
   return true;
 }
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index 979372851..e446da3fd 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -1058,6 +1058,11 @@ namespace tools
     bool get_ring(const std::string &filename, const crypto::key_image &key_image, std::vector<uint64_t> &outs);
     bool find_and_save_rings(const std::string &filename, bool force = true);
 
+    bool blackball_output(const crypto::public_key &output);
+    bool set_blackballed_outputs(const std::vector<crypto::public_key> &outputs, bool add = false);
+    bool unblackball_output(const crypto::public_key &output);
+    bool is_output_blackballed(const crypto::public_key &output) const;
+
   private:
     /*!
      * \brief  Stores wallet information to wallet file.