// 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) const {return true;}
  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)
{
  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_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));
}

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