/*

Copyright (c) 2019, Arvid Norberg

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions

are met:

    * Redistributions of source code must retain the above copyright

      notice, this list of conditions and the following disclaimer.

    * 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.

    * Neither the name of the author 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 OWNER 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.

*/

#include "libtorrent/kademlia/dht_tracker.hpp"

#include "libtorrent/performance_counters.hpp"

#include "libtorrent/kademlia/dht_observer.hpp"

#include "libtorrent/ip_filter.hpp"

#include "libtorrent/aux_/session_impl.hpp"

#include <memory>

using namespace lt;

aux::session_settings sett;

dht::dht_state state;

std::unique_ptr<lt::dht::dht_storage_interface> dht_storage(dht::dht_default_storage_constructor(sett));

counters cnt;

struct obs : dht::dht_observer

{

  void set_external_address(lt::aux::listen_socket_handle const&, lt::address const& /* addr */

    , lt::address const&) override

  {}

  int get_listen_port(aux::transport ssl, aux::listen_socket_handle const& s) override

  { return 6881; }

  void get_peers(lt::sha1_hash const&) override {}

  void outgoing_get_peers(sha1_hash const&

    , sha1_hash const&, lt::udp::endpoint const&) override {}

  void announce(sha1_hash const&, lt::address const&, int) override {}

  bool on_dht_request(string_view

    , dht::msg const&, entry&) override

  { return false; }

#ifndef TORRENT_DISABLE_LOGGING

  void log(dht_logger::module_t, char const*, ...) override {}

  bool should_log(module_t) const override { return true; }

  void log_packet(message_direction_t

    , span<char const>

    , lt::udp::endpoint const&) override {}

#endif // TORRENT_DISABLE_LOGGING

};

obs o;

io_context ios;

dht::dht_tracker dht_node(&o

  , ios

  , [](aux::listen_socket_handle const&, udp::endpoint const&

    , span<char const>, error_code&, udp_send_flags_t) {}

  , sett

  , cnt

  , *dht_storage

  , std::move(state));

auto listen_socket = std::make_shared<aux::listen_socket_t>();

aux::listen_socket_handle s(listen_socket);

error_code ignore;

lt::address_v4 src = make_address_v4("2.2.2.2", ignore);

udp::endpoint ep(src, 6881);

std::once_flag once_flag;

extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)

{

  ep.address(src);

  src = lt::address_v4(aux::plus_one(src.to_bytes()));

  std::call_once(once_flag, []{ dht_node.new_socket(s); });

  dht_node.incoming_packet(s, ep, {reinterpret_cast<char const*>(data), int(size)});

  return 0;

}