text: /*
  
  Copyright (c) 2015, 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 <array>
  #include "test.hpp"
  #include "create_torrent.hpp"
  #include "settings.hpp"
  #include "libtorrent/session.hpp"
  #include "libtorrent/session_stats.hpp"
  #include "libtorrent/settings_pack.hpp"
  #include "libtorrent/ip_filter.hpp"
  #include "libtorrent/alert_types.hpp"
  #include "libtorrent/aux_/proxy_settings.hpp"
  #include "libtorrent/settings_pack.hpp"
  #include "simulator/simulator.hpp"
  #include "simulator/socks_server.hpp"
  #include "simulator/utils.hpp"
  #include "setup_swarm.hpp"
  #include "utils.hpp"
  #include "test_utils.hpp"
  #include "setup_transfer.hpp" // for addr()
  #include "disk_io.hpp"
  
  using namespace sim;
  
  
  std::string make_ep_string(char const* address, bool const is_v6
  	, char const* port)
  {
  	std::string ret;
  	if (is_v6) ret += '[';
  	ret += address;
  	if (is_v6) ret += ']';
  	ret += ':';
  	ret += port;
  	return ret;
  }
  
  template <typename Setup, typename HandleAlerts, typename Test>
  void run_test(
  	Setup const& setup
  	, HandleAlerts const& on_alert
  	, Test const& test
  	, test_transfer_flags_t flags = {}
  	, test_disk const disk_constructor = test_disk()
  	, lt::seconds const timeout = lt::seconds(60)
  	)
  {
  	using namespace lt;
  
  	const bool use_ipv6 = bool(flags & tx::ipv6);
  
  	char const* peer0_ip[2] = { "50.0.0.1", "feed:face:baad:f00d::1" };
  	char const* peer1_ip[2] = { "50.0.0.2", "feed:face:baad:f00d::2" };
  
  	using asio::ip::address;
  	address peer0 = addr(peer0_ip[use_ipv6]);
  	address peer1 = addr(peer1_ip[use_ipv6]);
  	address proxy = (flags & tx::ipv6) ? addr("2001::2") : addr("50.50.50.50");
  
  	// setup the simulation
  	sim::default_config network_cfg;
  	sim::simulation sim{network_cfg};
  	sim::asio::io_context ios0 { sim, peer0 };
  	sim::asio::io_context ios1 { sim, peer1 };
  
  	lt::session_proxy zombie[2];
  
  	sim::asio::io_context proxy_ios{sim, proxy };
  	sim::socks_server socks4(proxy_ios, 4444, 4);
  	sim::socks_server socks5(proxy_ios, 5555, 5);
  
  	lt::session_params params;
  	// setup settings pack to use for the session (customization point)
  	lt::settings_pack& pack = params.settings;
  	pack = settings();
  	pack.set_bool(settings_pack::disable_hash_checks, false);
  
  	// disable utp by default
  	pack.set_bool(settings_pack::enable_outgoing_utp, false);
  	pack.set_bool(settings_pack::enable_incoming_utp, false);
  
  	// disable encryption by default
  	pack.set_bool(settings_pack::prefer_rc4, false);
  	pack.set_int(settings_pack::in_enc_policy, settings_pack::pe_disabled);
  	pack.set_int(settings_pack::out_enc_policy, settings_pack::pe_disabled);
  	pack.set_int(settings_pack::allowed_enc_level, settings_pack::pe_plaintext);
  
  	pack.set_str(settings_pack::listen_interfaces, make_ep_string(peer0_ip[use_ipv6], use_ipv6, "6881"));
  
  	// create session
  	std::shared_ptr<lt::session> ses[2];
  
  	// session 0 is a downloader, session 1 is a seed
  
  	params.disk_io_constructor = disk_constructor;
  	ses[0] = std::make_shared<lt::session>(params, ios0);
  
  	pack.set_str(settings_pack::listen_interfaces, make_ep_string(peer1_ip[use_ipv6], use_ipv6, "6881"));
  
  	params.disk_io_constructor = test_disk().set_seed();
  	ses[1] = std::make_shared<lt::session>(params, ios1);
  
  	setup(*ses[0], *ses[1]);
  
  	// only monitor alerts for session 0 (the downloader)
  	print_alerts(*ses[0], [=](lt::session& ses, lt::alert const* a) {
  		if (auto ta = alert_cast<lt::add_torrent_alert>(a))
  		{
  			ta->handle.connect_peer(lt::tcp::endpoint(peer1, 6881));
  		}
  		on_alert(ses, a);
  	}, 0);
  
  	print_alerts(*ses[1], [](lt::session&, lt::alert const*){}, 1);
  
  	lt::add_torrent_params atp = ::create_test_torrent(10
  		, (flags & tx::v2_only) ? create_torrent::v2_only
  		: (flags & tx::v1_only) ? create_torrent::v1_only
  		: create_flags_t{});
  	atp.flags &= ~lt::torrent_flags::auto_managed;
  	atp.flags &= ~lt::torrent_flags::paused;
  
  	ses[1]->async_add_torrent(atp);
  	auto torrent = atp.ti;
  
  	atp.save_path = save_path(0);
  	if (flags & tx::magnet_download)
  	{
  		atp.info_hashes = atp.ti->info_hashes();
  		atp.ti.reset();
  	}
  	ses[0]->async_add_torrent(atp);
  
  	sim::timer t(sim, timeout, [&](boost::system::error_code const&)
  	{
  		auto h = ses[0]->get_torrents();
  		auto ti = h[0].torrent_file_with_hashes();
  
  		if (ti->v2())
  			TEST_EQUAL(ti->v2_piece_hashes_verified(), true);
  
  		auto downloaded = serialize(*ti);
  		auto added = serialize(*torrent);
  		TEST_CHECK(downloaded == added);
  
  		test(ses);
  
  		// shut down
  		int idx = 0;
  		for (auto& s : ses)
  		{
  			zombie[idx++] = s->abort();
  			s.reset();
  		}
  	});
  
  	sim.run();
  }
  
  TORRENT_TEST(socks4_tcp)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{
  			set_proxy(ses0, settings_pack::socks4);
  			filter_ips(ses1);
  		},
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  	);
  }
  
  TORRENT_TEST(socks5_tcp_connect)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{
  			set_proxy(ses0, settings_pack::socks5);
  			filter_ips(ses1);
  		},
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  	);
  }
  
  TORRENT_TEST(encryption_tcp)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{ enable_enc(ses0); enable_enc(ses1); },
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  	);
  }
  
  TORRENT_TEST(no_proxy_tcp_ipv6)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session&, lt::session&) {},
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		},
  		tx::ipv6
  	);
  }
  
  TORRENT_TEST(no_proxy_utp_ipv6)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{ utp_only(ses0); utp_only(ses1); },
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		},
  		tx::ipv6
  	);
  }
  
  // TODO: the socks server does not support IPv6 addresses yet
  /*
  TORRENT_TEST(socks5_tcp_ipv6)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{
  			set_proxy(ses0, settings_pack::socks5);
  			filter_ips(ses1);
  		},
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		},
  		tx::ipv6
  	);
  }
  */
  
  TORRENT_TEST(no_proxy_tcp)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session&, lt::session&) {},
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  	);
  }
  
  TORRENT_TEST(no_proxy_utp)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{ utp_only(ses0); utp_only(ses1); },
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  	);
  }
  
  TORRENT_TEST(encryption_utp)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{
  			enable_enc(ses0);
  			enable_enc(ses1);
  			utp_only(ses0);
  			utp_only(ses1);
  		},
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  	);
  }
  
  TORRENT_TEST(socks5_utp)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{
  			set_proxy(ses0, settings_pack::socks5);
  			utp_only(ses0);
  			filter_ips(ses1);
  			utp_only(ses1);
  		},
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  	);
  }
  
  // the purpose of these tests is to make sure that the sessions can't actually
  // talk directly to each other. i.e. they are negative tests. If they can talk
  // directly to each other, all other tests in here may be broken.
  TORRENT_TEST(no_proxy_tcp_banned)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session&, lt::session& ses1) { filter_ips(ses1); },
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), false);
  		}
  	);
  }
  
  TORRENT_TEST(no_proxy_utp_banned)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{ utp_only(ses0); utp_only(ses1); filter_ips(ses1); },
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), false);
  		}
  	);
  }
  
  TORRENT_TEST(v2_only)
  {
  	using namespace lt;
  	std::set<piece_index_t> passed;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1) {},
  		[&](lt::session&, lt::alert const* a) {
  			if (auto const* pf = alert_cast<piece_finished_alert>(a))
  				passed.insert(pf->piece_index);
  		},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  		, tx::v2_only
  	);
  	TEST_EQUAL(passed.size(), 10);
  }
  
  TORRENT_TEST(v2_only_magnet)
  {
  	using namespace lt;
  	std::set<piece_index_t> passed;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1) {},
  		[&](lt::session&, lt::alert const* a) {
  			if (auto const* pf = alert_cast<piece_finished_alert>(a))
  				passed.insert(pf->piece_index);
  		},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  		, tx::v2_only | tx::magnet_download
  	);
  	TEST_EQUAL(passed.size(), 10);
  }
  
  TORRENT_TEST(v1_only)
  {
  	using namespace lt;
  	std::set<piece_index_t> passed;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1) {},
  		[&](lt::session&, lt::alert const* a) {
  			if (auto const* pf = alert_cast<piece_finished_alert>(a))
  				passed.insert(pf->piece_index);
  		},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  		, tx::v1_only
  	);
  	TEST_EQUAL(passed.size(), 10);
  }
  
  TORRENT_TEST(piece_extent_affinity)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session& ses1)
  		{
  			settings_pack p;
  			p.set_bool(settings_pack::piece_extent_affinity, true);
  			ses0.apply_settings(p);
  			ses1.apply_settings(p);
  		},
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  	);
  }
  
  TORRENT_TEST(is_finished)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session&, lt::session&) {},
  		[](lt::session& ses, lt::alert const* a) {
  			if (alert_cast<piece_finished_alert>(a))
  			{
  				TEST_EQUAL(is_finished(ses), false);
  				std::vector<download_priority_t> prio(4, dont_download);
  				ses.get_torrents()[0].prioritize_files(prio);
  				// applying the priorities is asynchronous. the torrent may not
  				// finish immediately
  			}
  		},
  		[](std::shared_ptr<lt::session> ses[2]) {
  				TEST_EQUAL(is_finished(*ses[0]), true);
  				TEST_EQUAL(is_finished(*ses[1]), true);
  		}
  	);
  }
  
  TORRENT_TEST(v1_only_magnet)
  {
  	using namespace lt;
  	std::set<piece_index_t> passed;
  	run_test(
  		[](lt::session&, lt::session&) {},
  		[&](lt::session&, lt::alert const* a) {
  			if (auto const* pf = alert_cast<piece_finished_alert>(a))
  				passed.insert(pf->piece_index);
  		},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  		, tx::v1_only | tx::magnet_download
  	);
  	TEST_EQUAL(passed.size(), 10);
  }
  
  TORRENT_TEST(disk_full)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session&, lt::session&) {},
  		[](lt::session&, lt::alert const*) {},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			// the disk filled up, we failed to complete the download
  			TEST_EQUAL(!is_seed(*ses[0]), true);
  		}
  		, {}
  		, test_disk().set_space_left(10 * lt::default_block_size)
  	);
  }
  
  TORRENT_TEST(disk_full_recover)
  {
  	using namespace lt;
  	run_test(
  		[](lt::session& ses0, lt::session&)
  		{
  			settings_pack p;
  			p.set_int(settings_pack::optimistic_disk_retry, 30);
  			ses0.apply_settings(p);
  		},
  		[](lt::session&, lt::alert const* a) {
  			if (auto ta = alert_cast<lt::add_torrent_alert>(a))
  			{
  				// the torrent has to be auto-managed in order to automatically
  				// leave upload mode after it hits disk-full
  				ta->handle.set_flags(torrent_flags::auto_managed);
  			}
  		},
  		[](std::shared_ptr<lt::session> ses[2]) {
  			// the disk filled up, we failed to complete the download
  			TEST_EQUAL(is_seed(*ses[0]), true);
  		}
  		, {}
  		, test_disk().set_space_left(10 * lt::default_block_size).set_recover_full_disk()
  		, lt::seconds(65)
  	);
  }
  