// Copyright (c) 2014-2020, The Monero Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers

#include "gtest/gtest.h"
#include "cryptonote_core/cryptonote_core.h"
#include "p2p/net_node.h"
#include "p2p/net_node.inl"
#include "cryptonote_core/i_core_events.h"
#include "cryptonote_protocol/cryptonote_protocol_handler.h"
#include "cryptonote_protocol/cryptonote_protocol_handler.inl"

#define MAKE_IPV4_ADDRESS(a,b,c,d) epee::net_utils::ipv4_network_address{MAKE_IP(a,b,c,d),0}
#define MAKE_IPV4_ADDRESS_PORT(a,b,c,d,e) epee::net_utils::ipv4_network_address{MAKE_IP(a,b,c,d),e}
#define MAKE_IPV4_SUBNET(a,b,c,d,e) epee::net_utils::ipv4_network_subnet{MAKE_IP(a,b,c,d),e}

namespace cryptonote {
  class blockchain_storage;
}

class test_core : public cryptonote::i_core_events
{
public:
  virtual bool is_synchronized() const final { return true; }
  void on_synchronized(){}
  void safesyncmode(const bool){}
  virtual uint64_t get_current_blockchain_height() const final {return 1;}
  void set_target_blockchain_height(uint64_t) {}
  bool init(const boost::program_options::variables_map& vm) {return true ;}
  bool deinit(){return true;}
  bool get_short_chain_history(std::list<crypto::hash>& ids) const { return true; }
  bool have_block(const crypto::hash& id, int *where = NULL) const {return false;}
  bool have_block_unlocked(const crypto::hash& id, int *where = NULL) const {return false;}
  void get_blockchain_top(uint64_t& height, crypto::hash& top_id)const{height=0;top_id=crypto::null_hash;}
  bool handle_incoming_tx(const cryptonote::tx_blob_entry& tx_blob, cryptonote::tx_verification_context& tvc, cryptonote::relay_method tx_relay, bool relayed) { return true; }
  bool handle_incoming_txs(const std::vector<cryptonote::tx_blob_entry>& tx_blob, std::vector<cryptonote::tx_verification_context>& tvc, cryptonote::relay_method tx_relay, bool relayed) { return true; }
  bool handle_incoming_block(const cryptonote::blobdata& block_blob, const cryptonote::block *block, cryptonote::block_verification_context& bvc, bool update_miner_blocktemplate = true) { return true; }
  void pause_mine(){}
  void resume_mine(){}
  bool on_idle(){return true;}
  bool find_blockchain_supplement(const std::list<crypto::hash>& qblock_ids, bool clip_pruned, cryptonote::NOTIFY_RESPONSE_CHAIN_ENTRY::request& resp){return true;}
  bool handle_get_objects(cryptonote::NOTIFY_REQUEST_GET_OBJECTS::request& arg, cryptonote::NOTIFY_RESPONSE_GET_OBJECTS::request& rsp, cryptonote::cryptonote_connection_context& context){return true;}
  cryptonote::blockchain_storage &get_blockchain_storage() { throw std::runtime_error("Called invalid member function: please never call get_blockchain_storage on the TESTING class test_core."); }
  bool get_test_drop_download() const {return true;}
  bool get_test_drop_download_height() const {return true;}
  bool prepare_handle_incoming_blocks(const std::vector<cryptonote::block_complete_entry>  &blocks_entry, std::vector<cryptonote::block> &blocks) { return true; }
  bool cleanup_handle_incoming_blocks(bool force_sync = false) { return true; }
  uint64_t get_target_blockchain_height() const { return 1; }
  size_t get_block_sync_size(uint64_t height) const { return BLOCKS_SYNCHRONIZING_DEFAULT_COUNT; }
  virtual void on_transactions_relayed(epee::span<const cryptonote::blobdata> tx_blobs, cryptonote::relay_method tx_relay) {}
  cryptonote::network_type get_nettype() const { return cryptonote::MAINNET; }
  bool get_pool_transaction(const crypto::hash& id, cryptonote::blobdata& tx_blob, cryptonote::relay_category tx_category) const { return false; }
  bool pool_has_tx(const crypto::hash &txid) const { return false; }
  bool get_blocks(uint64_t start_offset, size_t count, std::vector<std::pair<cryptonote::blobdata, cryptonote::block>>& blocks, std::vector<cryptonote::blobdata>& txs) const { return false; }
  bool get_transactions(const std::vector<crypto::hash>& txs_ids, std::vector<cryptonote::transaction>& txs, std::vector<crypto::hash>& missed_txs) const { return false; }
  bool get_block_by_hash(const crypto::hash &h, cryptonote::block &blk, bool *orphan = NULL) const { return false; }
  uint8_t get_ideal_hard_fork_version() const { return 0; }
  uint8_t get_ideal_hard_fork_version(uint64_t height) const { return 0; }
  uint8_t get_hard_fork_version(uint64_t height) const { return 0; }
  uint64_t get_earliest_ideal_height_for_version(uint8_t version) const { return 0; }
  cryptonote::difficulty_type get_block_cumulative_difficulty(uint64_t height) const { return 0; }
  bool fluffy_blocks_enabled() const { return false; }
  uint64_t prevalidate_block_hashes(uint64_t height, const std::vector<crypto::hash> &hashes, const std::vector<uint64_t> &weights) { return 0; }
  bool pad_transactions() { return false; }
  uint32_t get_blockchain_pruning_seed() const { return 0; }
  bool prune_blockchain(uint32_t pruning_seed = 0) { return true; }
  bool is_within_compiled_block_hash_area(uint64_t height) const { return false; }
  bool has_block_weights(uint64_t height, uint64_t nblocks) const { return false; }
  bool get_txpool_complement(const std::vector<crypto::hash> &hashes, std::vector<cryptonote::blobdata> &txes) { return false; }
  bool get_pool_transaction_hashes(std::vector<crypto::hash>& txs, bool include_unrelayed_txes = true) const { return false; }
  crypto::hash get_block_id_by_height(uint64_t height) const { return crypto::null_hash; }
  void stop() {}
};

typedef nodetool::node_server<cryptonote::t_cryptonote_protocol_handler<test_core>> Server;

static bool is_blocked(Server &server, const epee::net_utils::network_address &address, time_t *t = NULL)
{
  std::map<std::string, time_t> hosts = server.get_blocked_hosts();
  for (auto rec: hosts)
  {
    if (rec.first == address.host_str())
    {
      if (t)
        *t = rec.second;
      return true;
    }
  }
  return false;
}

TEST(ban, add)
{
  test_core pr_core;
  cryptonote::t_cryptonote_protocol_handler<test_core> cprotocol(pr_core, NULL);
  Server server(cprotocol);
  cprotocol.set_p2p_endpoint(&server);

  // starts empty
  ASSERT_TRUE(server.get_blocked_hosts().empty());
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));

  // add an IP
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_TRUE(server.get_blocked_hosts().size() == 1);
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));

  // add the same, should not change
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_TRUE(server.get_blocked_hosts().size() == 1);
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));

  // remove an unblocked IP, should not change
  ASSERT_FALSE(server.unblock_host(MAKE_IPV4_ADDRESS(1,2,3,5)));
  ASSERT_TRUE(server.get_blocked_hosts().size() == 1);
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));

  // remove the IP, ends up empty
  ASSERT_TRUE(server.unblock_host(MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_TRUE(server.get_blocked_hosts().size() == 0);
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));

  // remove the IP from an empty list, still empty
  ASSERT_FALSE(server.unblock_host(MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_TRUE(server.get_blocked_hosts().size() == 0);
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));

  // add two for known amounts of time, they're both blocked
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS(1,2,3,4), 1));
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS(1,2,3,5), 3));
  ASSERT_TRUE(server.get_blocked_hosts().size() == 2);
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));
  ASSERT_TRUE(server.unblock_host(MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_TRUE(server.unblock_host(MAKE_IPV4_ADDRESS(1,2,3,5)));

  // these tests would need to call is_remote_ip_allowed, which is private
#if 0
  // after two seconds, the first IP is unblocked, but not the second yet
  sleep(2);
  ASSERT_TRUE(server.get_blocked_hosts().size() == 1);
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));

  // after two more seconds, the second IP is also unblocked
  sleep(2);
  ASSERT_TRUE(server.get_blocked_hosts().size() == 0);
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));
#endif

  // add an IP again, then re-ban for longer, then shorter
  time_t t;
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS(1,2,3,4), 2));
  ASSERT_TRUE(server.get_blocked_hosts().size() == 1);
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4), &t));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));
  ASSERT_TRUE(t >= 1);
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS(1,2,3,4), 9));
  ASSERT_TRUE(server.get_blocked_hosts().size() == 1);
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4), &t));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));
  ASSERT_TRUE(t >= 8);
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS(1,2,3,4), 5));
  ASSERT_TRUE(server.get_blocked_hosts().size() == 1);
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4), &t));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,5)));
  ASSERT_TRUE(t >= 4);
}

TEST(ban, limit)
{
  test_core pr_core;
  cryptonote::t_cryptonote_protocol_handler<test_core> cprotocol(pr_core, NULL);
  Server server(cprotocol);
  cprotocol.set_p2p_endpoint(&server);

  // starts empty
  ASSERT_TRUE(server.get_blocked_hosts().empty());
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS(1,2,3,4), std::numeric_limits<time_t>::max() - 1));
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS(1,2,3,4), 1));
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS(1,2,3,4)));
}

TEST(ban, subnet)
{
  time_t seconds;
  test_core pr_core;
  cryptonote::t_cryptonote_protocol_handler<test_core> cprotocol(pr_core, NULL);
  Server server(cprotocol);
  cprotocol.set_p2p_endpoint(&server);

  ASSERT_TRUE(server.block_subnet(MAKE_IPV4_SUBNET(1,2,3,4,24), 10));
  ASSERT_TRUE(server.get_blocked_subnets().size() == 1);
  ASSERT_TRUE(server.is_host_blocked(MAKE_IPV4_ADDRESS(1,2,3,4), &seconds));
  ASSERT_TRUE(seconds >= 9);
  ASSERT_TRUE(server.is_host_blocked(MAKE_IPV4_ADDRESS(1,2,3,255), &seconds));
  ASSERT_TRUE(server.is_host_blocked(MAKE_IPV4_ADDRESS(1,2,3,0), &seconds));
  ASSERT_FALSE(server.is_host_blocked(MAKE_IPV4_ADDRESS(1,2,4,0), &seconds));
  ASSERT_FALSE(server.is_host_blocked(MAKE_IPV4_ADDRESS(1,2,2,0), &seconds));
  ASSERT_TRUE(server.unblock_subnet(MAKE_IPV4_SUBNET(1,2,3,8,24)));
  ASSERT_TRUE(server.get_blocked_subnets().size() == 0);
  ASSERT_FALSE(server.is_host_blocked(MAKE_IPV4_ADDRESS(1,2,3,255), &seconds));
  ASSERT_FALSE(server.is_host_blocked(MAKE_IPV4_ADDRESS(1,2,3,0), &seconds));
  ASSERT_TRUE(server.block_subnet(MAKE_IPV4_SUBNET(1,2,3,4,8), 10));
  ASSERT_TRUE(server.get_blocked_subnets().size() == 1);
  ASSERT_TRUE(server.is_host_blocked(MAKE_IPV4_ADDRESS(1,255,3,255), &seconds));
  ASSERT_TRUE(server.is_host_blocked(MAKE_IPV4_ADDRESS(1,0,3,255), &seconds));
  ASSERT_FALSE(server.unblock_subnet(MAKE_IPV4_SUBNET(1,2,3,8,24)));
  ASSERT_TRUE(server.get_blocked_subnets().size() == 1);
  ASSERT_TRUE(server.block_subnet(MAKE_IPV4_SUBNET(1,2,3,4,8), 10));
  ASSERT_TRUE(server.get_blocked_subnets().size() == 1);
  ASSERT_TRUE(server.unblock_subnet(MAKE_IPV4_SUBNET(1,255,0,0,8)));
  ASSERT_TRUE(server.get_blocked_subnets().size() == 0);
}

TEST(ban, ignores_port)
{
  test_core pr_core;
  cryptonote::t_cryptonote_protocol_handler<test_core> cprotocol(pr_core, NULL);
  Server server(cprotocol);
  cprotocol.set_p2p_endpoint(&server);

  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS_PORT(1,2,3,4,5)));
  ASSERT_TRUE(server.block_host(MAKE_IPV4_ADDRESS_PORT(1,2,3,4,5), std::numeric_limits<time_t>::max() - 1));
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS_PORT(1,2,3,4,5)));
  ASSERT_TRUE(is_blocked(server,MAKE_IPV4_ADDRESS_PORT(1,2,3,4,6)));
  ASSERT_TRUE(server.unblock_host(MAKE_IPV4_ADDRESS_PORT(1,2,3,4,5)));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS_PORT(1,2,3,4,5)));
  ASSERT_FALSE(is_blocked(server,MAKE_IPV4_ADDRESS_PORT(1,2,3,4,6)));
}

TEST(node_server, bind_same_p2p_port)
{
  struct test_data_t
  {
    test_core pr_core;
    cryptonote::t_cryptonote_protocol_handler<test_core> cprotocol;
    std::unique_ptr<Server> server;

    test_data_t(): cprotocol(pr_core, NULL)
    {
      server.reset(new Server(cprotocol));
      cprotocol.set_p2p_endpoint(server.get());
    }
  };

  const auto new_node = []() -> std::unique_ptr<test_data_t> {
    test_data_t *d = new test_data_t;
    return std::unique_ptr<test_data_t>(d);
  };

  const auto init = [](const std::unique_ptr<test_data_t>& server, const char* port) -> bool {
    boost::program_options::options_description desc_options("Command line options");
    cryptonote::core::init_options(desc_options);
    Server::init_options(desc_options);

    const char *argv[2] = {nullptr, nullptr};
    boost::program_options::variables_map vm;
    boost::program_options::store(boost::program_options::parse_command_line(1, argv, desc_options), vm);

    vm.find(nodetool::arg_p2p_bind_port.name)->second = boost::program_options::variable_value(std::string(port), false);

    boost::program_options::notify(vm);

    return server->server->init(vm);
  };

  constexpr char port[] = "48080";
  constexpr char port_another[] = "58080";

  const auto node = new_node();
  EXPECT_TRUE(init(node, port));

  EXPECT_FALSE(init(new_node(), port));
  EXPECT_TRUE(init(new_node(), port_another));
}

TEST(cryptonote_protocol_handler, race_condition)
{
  struct contexts {
    using basic = epee::net_utils::connection_context_base;
    using cryptonote = cryptonote::cryptonote_connection_context;
    using p2p = nodetool::p2p_connection_context_t<cryptonote>;
  };
  using context_t = contexts::p2p;
  using handler_t = epee::levin::async_protocol_handler<context_t>;
  using connection_t = epee::net_utils::connection<handler_t>;
  using connection_ptr = boost::shared_ptr<connection_t>;
  using connections_t = std::vector<connection_ptr>;
  using shared_state_t = typename connection_t::shared_state;
  using shared_state_ptr = std::shared_ptr<shared_state_t>;
  using io_context_t = boost::asio::io_service;
  using event_t = epee::simple_event;
  using ec_t = boost::system::error_code;
  auto create_conn_pair = [](connection_ptr in, connection_ptr out) {
    using endpoint_t = boost::asio::ip::tcp::endpoint;
    using acceptor_t = boost::asio::ip::tcp::acceptor;
    io_context_t io_context;
    endpoint_t endpoint(boost::asio::ip::address::from_string("127.0.0.1"), 5262);
    acceptor_t acceptor(io_context);
    ec_t ec;
    acceptor.open(endpoint.protocol(), ec);
    EXPECT_EQ(ec.value(), 0);
    acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
    acceptor.bind(endpoint, ec);
    EXPECT_EQ(ec.value(), 0);
    acceptor.listen(boost::asio::socket_base::max_listen_connections, ec);
    EXPECT_EQ(ec.value(), 0);
    out->socket().open(endpoint.protocol(), ec);
    EXPECT_EQ(ec.value(), 0);
    acceptor.async_accept(in->socket(), [](const ec_t &ec){});
    out->socket().async_connect(endpoint, [](const ec_t &ec){});
    io_context.run();
    acceptor.close(ec);
    EXPECT_EQ(ec.value(), 0);
    EXPECT_TRUE(in->start(true, true));
    EXPECT_TRUE(out->start(false, true));
    return std::make_pair<>(std::move(in), std::move(out));
  };
  auto get_conn_tag = [](connection_t &conn){
    context_t context;
    conn.get_context(context);
    return context.m_connection_id;
  };
  using work_t = boost::asio::io_service::work;
  using work_ptr = std::shared_ptr<work_t>;
  using workers_t = std::vector<std::thread>;
  using commands_handler_t = epee::levin::levin_commands_handler<context_t>;
  using p2p_endpoint_t = nodetool::i_p2p_endpoint<contexts::cryptonote>;
  using core_t = cryptonote::core;
  using core_ptr = std::unique_ptr<core_t>;
  using core_protocol_t = cryptonote::t_cryptonote_protocol_handler<core_t>;
  using core_protocol_ptr = std::shared_ptr<core_protocol_t>;
  using block_t = cryptonote::block;
  using diff_t = cryptonote::difficulty_type;
  using reward_t = uint64_t;
  using height_t = uint64_t;
  struct span {
    using blocks = epee::span<const block_t>;
  };
  auto get_block_template = [](
    core_t &core,
    block_t &block,
    diff_t &diff,
    reward_t &reward
  ){
    auto &storage = core.get_blockchain_storage();
    const auto height = storage.get_current_blockchain_height();
    const auto hardfork = storage.get_current_hard_fork_version();
    block.major_version = hardfork;
    block.minor_version = storage.get_ideal_hard_fork_version();
    block.prev_id = storage.get_tail_id();
    auto &db = storage.get_db();
    block.timestamp = db.get_top_block_timestamp();
    block.nonce = 0xACAB;
    block.miner_tx.vin.clear();
    block.miner_tx.vout.clear();
    block.miner_tx.extra.clear();
    block.miner_tx.version = hardfork >= 4 ? 2 : 1;
    block.miner_tx.unlock_time = height + CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW;
    block.miner_tx.vin.push_back(cryptonote::txin_gen{height});
    cryptonote::add_tx_pub_key_to_extra(block.miner_tx, {});
    cryptonote::get_block_reward(
      db.get_block_weight(height - 1),
      {},
      db.get_block_already_generated_coins(height - 1),
      reward,
      hardfork
    );
    block.miner_tx.vout.push_back(cryptonote::tx_out{reward, cryptonote::txout_to_key{}});
    diff = storage.get_difficulty_for_next_block();
  };
  struct stat {
    struct chain {
      diff_t diff;
      reward_t reward;
    };
  };
  auto add_block = [](
    core_t &core,
    const block_t &block,
    const stat::chain &stat
  ){
    core.get_blockchain_storage().get_db().batch_start({}, {});
    core.get_blockchain_storage().get_db().add_block(
      {block, cryptonote::block_to_blob(block)},
      cryptonote::get_transaction_weight(block.miner_tx),
      core.get_blockchain_storage().get_next_long_term_block_weight(
        cryptonote::get_transaction_weight(block.miner_tx)
      ),
      stat.diff,
      stat.reward,
      {}
    );
    core.get_blockchain_storage().get_db().batch_stop();
  };
  struct messages {
    struct core {
      using sync = cryptonote::CORE_SYNC_DATA;
    };
    using handshake = nodetool::COMMAND_HANDSHAKE_T<core::sync>;
  };
  struct net_node_t: commands_handler_t, p2p_endpoint_t {
    using span_t = epee::span<const uint8_t>;
    using string_t = std::string;
    using zone_t = epee::net_utils::zone;
    using uuid_t = boost::uuids::uuid;
    using relay_t = cryptonote::relay_method;
    using blobs_t = std::vector<cryptonote::blobdata>;
    using id_t = nodetool::peerid_type;
    using callback_t = std::function<bool(contexts::cryptonote &, id_t, uint32_t)>;
    using address_t = epee::net_utils::network_address;
    using connections_t = std::vector<std::pair<zone_t, uuid_t>>;
    struct bans {
      using subnets = std::map<epee::net_utils::ipv4_network_subnet, time_t>;
      using hosts = std::map<std::string, time_t>;
    };
    struct slice {
      using bytes = epee::byte_slice;
    };
    shared_state_ptr shared_state;
    core_protocol_ptr core_protocol;
    virtual int invoke(int command, const span_t in, slice::bytes &out, context_t &context) override {
      if (core_protocol) {
        if (command == messages::handshake::ID) {
          return epee::net_utils::buff_to_t_adapter<void, typename messages::handshake::request, typename messages::handshake::response>(
            command,
            in,
            out,
            [this](int command, typename messages::handshake::request &in, typename messages::handshake::response &out, context_t &context){
              core_protocol->process_payload_sync_data(in.payload_data, context, true);
              core_protocol->get_payload_sync_data(out.payload_data);
              return 1;
            },
            context
          );
        }
        bool handled;
        return core_protocol->handle_invoke_map(false, command, in, out, context, handled);
      }
      else
        return {};
    }
    virtual int notify(int command, const span_t in, context_t &context) override {
      if (core_protocol) {
        bool handled;
        slice::bytes out;
        return core_protocol->handle_invoke_map(true, command, in, out, context, handled);
      }
      else
        return {};
    }
    virtual void callback(context_t &context) override {
      if (core_protocol)
        core_protocol->on_callback(context);
    }
    virtual void on_connection_new(context_t&) override {}
    virtual void on_connection_close(context_t &context) override {
      if (core_protocol)
        core_protocol->on_connection_close(context);
    }
    virtual ~net_node_t() override {}
    virtual bool add_host_fail(const address_t&, unsigned int = {}) override {
      return {};
    }
    virtual bool block_host(address_t address, time_t = {}, bool = {}) override {
      return {};
    }
    virtual bool drop_connection(const contexts::basic& context) override {
      if (shared_state)
        return shared_state->close(context.m_connection_id);
      else
        return {};
    }
    virtual bool for_connection(const uuid_t& uuid, callback_t f) override {
      if (shared_state)
        return shared_state->for_connection(uuid,[&f](context_t &context){
          return f(context, context.peer_id, context.support_flags);
        });
      else
        return {};
    }
    virtual bool invoke_command_to_peer(int command, const span_t in, string_t& out, const contexts::basic& context) override {
      if (shared_state)
        return shared_state->invoke(command, in, out, context.m_connection_id);
      else
        return {};
    }
    virtual bool invoke_notify_to_peer(int command, const span_t in, const contexts::basic& context) override {
      if (shared_state)
        return shared_state->notify(command, in, context.m_connection_id);
      else
        return {};
    }
    virtual bool relay_notify_to_list(int command, const span_t in, connections_t connections) override {
      if (shared_state) {
        for (auto &e: connections)
          shared_state->notify(command, in, e.second);
      }
      return {};
    }
    virtual bool unblock_host(const address_t&) override {
      return {};
    }
    virtual zone_t send_txs(blobs_t, const zone_t, const uuid_t&, relay_t) override {
      return {};
    }
    virtual bans::subnets get_blocked_subnets() override {
      return {};
    }
    virtual bans::hosts get_blocked_hosts() override {
      return {};
    }
    virtual uint64_t get_public_connections_count() override {
      if (shared_state)
        return shared_state->get_connections_count();
      else
        return {};
    }
    virtual void add_used_stripe_peer(const contexts::cryptonote&) override {}
    virtual void clear_used_stripe_peers() override {}
    virtual void remove_used_stripe_peer(const contexts::cryptonote&) override {}
    virtual void for_each_connection(callback_t f) override {
      if (shared_state)
        shared_state->foreach_connection([&f](context_t &context){
          return f(context, context.peer_id, context.support_flags);
        });
    }
    virtual void request_callback(const contexts::basic &context) override {
      if (shared_state)
        shared_state->request_callback(context.m_connection_id);
    }
  };
  auto conduct_handshake = [get_conn_tag](net_node_t &net_node, connection_ptr conn){
    event_t handshaked;
    net_node.shared_state->for_connection(
      get_conn_tag(*conn),
      [&handshaked, &net_node](context_t &context){
        typename messages::handshake::request msg;
        net_node.core_protocol->get_payload_sync_data(msg.payload_data);
        epee::net_utils::async_invoke_remote_command2<typename messages::handshake::response>(
          context,
          messages::handshake::ID,
          msg,
          *net_node.shared_state,
          [&handshaked, &net_node](int code, const typename messages::handshake::response &msg, context_t &context){
            EXPECT_TRUE(code >= 0);
            net_node.core_protocol->process_payload_sync_data(msg.payload_data, context, true);
            handshaked.raise();
          },
          P2P_DEFAULT_HANDSHAKE_INVOKE_TIMEOUT
        );
        return true;
      }
    );
    handshaked.wait();
  };
  using path_t = boost::filesystem::path;
  auto create_dir = []{
    ec_t ec;
    path_t path = boost::filesystem::temp_directory_path() / boost::filesystem::unique_path("daemon-%%%%%%%%%%%%%%%%", ec);
    if (ec)
      return path_t{};
    auto success = boost::filesystem::create_directory(path, ec);
    if (not ec && success)
      return path;
    return path_t{};
  };
  auto remove_tree = [](const path_t &path){
    ec_t ec;
    boost::filesystem::remove_all(path, ec);
  };
  using options_t = boost::program_options::variables_map;
  struct daemon_t {
    options_t options;
    core_ptr core;
    core_protocol_ptr core_protocol;
    net_node_t net_node;
    shared_state_ptr shared_state;
    connections_t conn;
  };
  struct daemons_t {
    daemon_t main;
    daemon_t alt;
  };
  using options_description_t = boost::program_options::options_description;

  const auto dir = create_dir();
  ASSERT_TRUE(not dir.empty());

  daemons_t daemon{
    {
      [&dir]{
        options_t options;
        boost::program_options::store(
          boost::program_options::command_line_parser({
            "--data-dir",
            (dir / "main").string(),
            "--disable-dns-checkpoints",
            "--check-updates=disabled",
            "--fixed-difficulty=1",
            "--block-sync-size=1",
            "--db-sync-mode=fastest:async:50000",
          }).options([]{
            options_description_t options_description{};
            cryptonote::core::init_options(options_description);
            return options_description;
          }()).run(),
          options
        );
        return options;
      }(),
      {},
      {},
      {},
      {},
      {},
    },
    {
      [&dir]{
        options_t options;
        boost::program_options::store(
          boost::program_options::command_line_parser({
            "--data-dir",
            (dir / "alt").string(),
            "--disable-dns-checkpoints",
            "--check-updates=disabled",
            "--fixed-difficulty=1",
            "--block-sync-size=1",
            "--db-sync-mode=fastest:async:50000",
          }).options([]{
            options_description_t options_description{};
            cryptonote::core::init_options(options_description);
            return options_description;
          }()).run(),
          options
        );
        return options;
      }(),
      {},
      {},
      {},
      {},
      {},
    },
  };

  io_context_t io_context;
  work_ptr work = std::make_shared<work_t>(io_context);
  workers_t workers;
  while (workers.size() < 4) {
    workers.emplace_back([&io_context]{
      io_context.run();
    });
  }

  connection_t::set_rate_up_limit(std::numeric_limits<int64_t>::max());
  connection_t::set_rate_down_limit(std::numeric_limits<int64_t>::max());

  {
    daemon.main.core = core_ptr(new core_t(nullptr));
    daemon.main.core->init(daemon.main.options, nullptr, nullptr);
    daemon.main.net_node.core_protocol = daemon.main.core_protocol = core_protocol_ptr(new core_protocol_t(
      *daemon.main.core, &daemon.main.net_node, {}
    ));
    daemon.main.core->set_cryptonote_protocol(daemon.main.core_protocol.get());
    daemon.main.core_protocol->init(daemon.main.options);
    daemon.main.net_node.shared_state = daemon.main.shared_state = std::make_shared<shared_state_t>();
    daemon.main.shared_state->set_handler(&daemon.main.net_node);
    daemon.alt.shared_state = std::make_shared<shared_state_t>();
    daemon.alt.shared_state->set_handler(&daemon.alt.net_node);

    struct {
      event_t prepare;
      event_t check;
      event_t finish;
    } events;
    auto connections = create_conn_pair(
      connection_ptr(new connection_t(io_context, daemon.main.shared_state, {}, {})),
      connection_ptr(new connection_t(io_context, daemon.alt.shared_state, {}, {}))
    );
    {
      auto conn = connections.first;
      auto shared_state = daemon.main.shared_state;
      const auto tag = get_conn_tag(*conn);
      conn->strand_.post([tag, conn, shared_state, &events]{
        shared_state->for_connection(tag, [](context_t &context){
          context.m_expect_height = -1;
          context.m_expect_response = -1;
          context.m_last_request_time = boost::date_time::min_date_time;
          context.m_score = 0;
          context.m_state = contexts::cryptonote::state_synchronizing;
          return true;
        });
        events.prepare.raise();
        events.check.wait();
        shared_state->for_connection(tag, [](context_t &context){
          EXPECT_TRUE(context.m_expect_height == -1);
          EXPECT_TRUE(context.m_expect_response == -1);
          EXPECT_TRUE(context.m_last_request_time == boost::date_time::min_date_time);
          EXPECT_TRUE(context.m_score == 0);
          EXPECT_TRUE(context.m_state == contexts::cryptonote::state_synchronizing);
          return true;
        });
        events.finish.raise();
      });
    }
    events.prepare.wait();
    daemon.main.core_protocol->on_idle();
    events.check.raise();
    events.finish.wait();

    connections.first->strand_.post([connections]{
      connections.first->cancel();
    });
    connections.second->strand_.post([connections]{
      connections.second->cancel();
    });
    connections.first.reset();
    connections.second.reset();
    while (daemon.main.shared_state->sock_count);
    while (daemon.alt.shared_state->sock_count);
    daemon.main.core_protocol->deinit();
    daemon.main.core->stop();
    daemon.main.core->deinit();
    daemon.main.net_node.shared_state.reset();
    daemon.main.shared_state.reset();
    daemon.main.core_protocol.reset();
    daemon.main.core.reset();
    daemon.alt.shared_state.reset();
  }

  {
    daemon.main.core = core_ptr(new core_t(nullptr));
    daemon.main.core->init(daemon.main.options, nullptr, nullptr);
    daemon.main.net_node.core_protocol = daemon.main.core_protocol = core_protocol_ptr(new core_protocol_t(
      *daemon.main.core, &daemon.main.net_node, {}
    ));
    daemon.main.core->set_cryptonote_protocol(daemon.main.core_protocol.get());
    daemon.main.core->set_checkpoints({});
    daemon.main.core_protocol->init(daemon.main.options);
    daemon.main.net_node.shared_state = daemon.main.shared_state = std::make_shared<shared_state_t>();
    daemon.main.shared_state->set_handler(&daemon.main.net_node);
    daemon.alt.core = core_ptr(new core_t(nullptr));
    daemon.alt.core->init(daemon.alt.options, nullptr, nullptr);
    daemon.alt.net_node.core_protocol = daemon.alt.core_protocol = core_protocol_ptr(new core_protocol_t(
      *daemon.alt.core, &daemon.alt.net_node, {}
    ));
    daemon.alt.core->set_cryptonote_protocol(daemon.alt.core_protocol.get());
    daemon.alt.core->set_checkpoints({});
    daemon.alt.core_protocol->init(daemon.alt.options);
    daemon.alt.net_node.shared_state = daemon.alt.shared_state = std::make_shared<shared_state_t>();
    daemon.alt.shared_state->set_handler(&daemon.alt.net_node);

    struct {
      io_context_t io_context;
      work_ptr work;
      workers_t workers;
    } check;
    check.work = std::make_shared<work_t>(check.io_context);
    check.workers.emplace_back([&check]{
      check.io_context.run();
    });
    while (daemon.main.conn.size() < 1) {
      daemon.main.conn.emplace_back(new connection_t(check.io_context, daemon.main.shared_state, {}, {}));
      daemon.alt.conn.emplace_back(new connection_t(io_context, daemon.alt.shared_state, {}, {}));
      create_conn_pair(daemon.main.conn.back(), daemon.alt.conn.back());
      conduct_handshake(daemon.alt.net_node, daemon.alt.conn.back());
    }
    struct {
      event_t prepare;
      event_t sync;
      event_t finish;
    } events;
    {
      auto conn = daemon.main.conn.back();
      auto shared_state = daemon.main.shared_state;
      const auto tag = get_conn_tag(*conn);
      conn->strand_.post([tag, conn, shared_state, &events]{
        shared_state->for_connection(tag, [](context_t &context){
          EXPECT_TRUE(context.m_state == contexts::cryptonote::state_normal);
          return true;
        });
        events.prepare.raise();
        events.sync.wait();
        shared_state->for_connection(tag, [](context_t &context){
          EXPECT_TRUE(context.m_state == contexts::cryptonote::state_normal);
          return true;
        });
        events.finish.raise();
      });
    }
    events.prepare.wait();
    daemon.main.core->get_blockchain_storage().add_block_notify(
      [&events](height_t height, span::blocks blocks){
        if (height >= CRYPTONOTE_PRUNING_STRIPE_SIZE)
          events.sync.raise();
      }
    );
    {
      stat::chain stat{
        daemon.alt.core->get_blockchain_storage().get_db().get_block_cumulative_difficulty(
          daemon.alt.core->get_current_blockchain_height() - 1
        ),
        daemon.alt.core->get_blockchain_storage().get_db().get_block_already_generated_coins(
          daemon.alt.core->get_current_blockchain_height() - 1
        ),
      };
      while (daemon.alt.core->get_current_blockchain_height() < CRYPTONOTE_PRUNING_STRIPE_SIZE + CRYPTONOTE_PRUNING_TIP_BLOCKS) {
        block_t block;
        diff_t diff;
        reward_t reward;
        get_block_template(*daemon.alt.core, block, diff, reward);
        stat.diff += diff;
        stat.reward = stat.reward < (MONEY_SUPPLY - stat.reward) ? stat.reward + reward : MONEY_SUPPLY;
        add_block(*daemon.alt.core, block, stat);
        if (daemon.main.core->get_current_blockchain_height() + 1 < CRYPTONOTE_PRUNING_STRIPE_SIZE)
          add_block(*daemon.main.core, block, stat);
      }
    }
    while (daemon.main.conn.size() < 2) {
      daemon.main.conn.emplace_back(new connection_t(io_context, daemon.main.shared_state, {}, {}));
      daemon.alt.conn.emplace_back(new connection_t(io_context, daemon.alt.shared_state, {}, {}));
      create_conn_pair(daemon.main.conn.back(), daemon.alt.conn.back());
      conduct_handshake(daemon.alt.net_node, daemon.alt.conn.back());
    }
    events.finish.wait();

    for (;daemon.main.conn.size(); daemon.main.conn.pop_back()) {
      auto conn = daemon.main.conn.back();
      conn->strand_.post([conn]{
        conn->cancel();
      });
    }
    for (;daemon.alt.conn.size(); daemon.alt.conn.pop_back()) {
      auto conn = daemon.alt.conn.back();
      conn->strand_.post([conn]{
        conn->cancel();
      });
    }
    while (daemon.main.shared_state->sock_count);
    while (daemon.alt.shared_state->sock_count);
    daemon.main.core_protocol->deinit();
    daemon.main.core->stop();
    daemon.main.core->deinit();
    daemon.main.net_node.shared_state.reset();
    daemon.main.shared_state.reset();
    daemon.main.core_protocol.reset();
    daemon.main.core.reset();
    daemon.alt.core_protocol->deinit();
    daemon.alt.core->stop();
    daemon.alt.core->deinit();
    daemon.alt.net_node.shared_state.reset();
    daemon.alt.shared_state.reset();
    daemon.alt.core_protocol.reset();
    daemon.alt.core.reset();
    check.work.reset();
    for (auto& w: check.workers) {
      w.join();
    }
  }

  work.reset();
  for (auto& w: workers) {
    w.join();
  }
  remove_tree(dir);
}

namespace nodetool { template class node_server<cryptonote::t_cryptonote_protocol_handler<test_core>>; }
namespace cryptonote { template class t_cryptonote_protocol_handler<test_core>; }