update libsimulator. add simulation/test for announcing twice to trackers over IPv4 and IPv6. fix bugs preventing libtorrent from doing that correctly

include/libtorrent/enum_net.hpp

@@ -124,6 +124,13 @@ namespace libtorrent
 		address ip = address::from_string(device_name, ec);
 		if (!ec)
 		{
+#if TORRENT_USE_IPV6
+			// this is to cover the case where "0.0.0.0" is considered any IPv4 or
+			// IPv6 address. If we're asking to be bound to an IPv6 address and
+			// providing 0.0.0.0 as the device, turn it into "::0"
+			if (ip == address_v4::any() && !ipv4)
+				ip = address_v6::any();
+#endif
 			bind_ep.address(ip);
 			// it appears to be an IP. Just bind to that address
 			sock.bind(bind_ep, ec);

simulation/libsimulator

@@ -1 +1 @@
-Subproject commit dedd409321589f8ed11d244e1b65772435ef91d1
+Subproject commit 47ccf576c6ed7700752ba294962d8e297b1ce76f

simulation/setup_swarm.cpp

@@ -127,11 +127,8 @@ struct swarm
 		bool term = false;
 		ses->pop_alerts(&alerts);
 
-		for (std::vector<lt::alert*>::iterator i = alerts.begin();
-			i != alerts.end(); ++i)
+		for (lt::alert* a : alerts)
 		{
-			lt::alert* a = *i;
-
 			lt::time_duration d = a->timestamp() - m_start_time;
 			boost::uint32_t millis = lt::duration_cast<lt::milliseconds>(d).count();
 			printf("%4d.%03d: [%02d] %s\n", millis / 1000, millis % 1000,

simulation/test_tracker.cpp

@@ -42,6 +42,8 @@ using namespace libtorrent;
 using namespace sim;
 namespace lt = libtorrent;
 
+using chrono::duration_cast;
+
 // seconds
 const int duration = 10000;
 
@@ -257,6 +259,131 @@ TORRENT_TEST(announce_interval_1200)
 	test_interval(3600);
 }
 
+struct sim_config : sim::default_config
+{
+	chrono::high_resolution_clock::duration hostname_lookup(
+		asio::ip::address const& requestor
+		, std::string hostname
+		, std::vector<asio::ip::address>& result
+		, boost::system::error_code& ec)
+	{
+		if (hostname == "tracker.com")
+		{
+			result.push_back(address_v4::from_string("10.0.0.2"));
+			result.push_back(address_v6::from_string("ff::dead:beef"));
+			return duration_cast<chrono::high_resolution_clock::duration>(chrono::milliseconds(100));
+		}
+
+		return default_config::hostname_lookup(requestor, hostname, result, ec);
+	}
+};
+
+void on_alert_notify(lt::session* ses)
+{
+	std::vector<lt::alert*> alerts;
+	ses->pop_alerts(&alerts);
+
+	for (lt::alert* a : alerts)
+	{
+		lt::time_duration d = a->timestamp().time_since_epoch();
+		boost::uint32_t millis = lt::duration_cast<lt::milliseconds>(d).count();
+		printf("%4d.%03d: %s\n", millis / 1000, millis % 1000,
+			a->message().c_str());
+	}
+}
+
+// this test makes sure that a tracker whose host name resolves to both IPv6 and
+// IPv4 addresses will be announced to twice, once for each address family
+TORRENT_TEST(ipv6_support)
+{
+	using sim::asio::ip::address_v4;
+	sim_config network_cfg;
+	sim::simulation sim{network_cfg};
+
+	sim::asio::io_service web_server_v4(sim, address_v4::from_string("10.0.0.2"));
+	sim::asio::io_service web_server_v6(sim, address_v6::from_string("ff::dead:beef"));
+
+	// listen on port 8080
+	sim::http_server http_v4(web_server_v4, 8080);
+	sim::http_server http_v6(web_server_v6, 8080);
+
+	// the timestamps (in seconds) of all announces
+	std::vector<std::string> announces;
+
+	int v4_announces = 0;
+	int v6_announces = 0;
+
+	http_v4.register_handler("/announce"
+	, [&v4_announces](std::string method, std::string req)
+	{
+		++v4_announces;
+		TEST_EQUAL(method, "GET");
+
+		char response[500];
+		int size = snprintf(response, sizeof(response), "d8:intervali1800e5:peers0:e");
+		return sim::send_response(200, "OK", size) + response;
+	});
+
+	http_v6.register_handler("/announce"
+	, [&v6_announces](std::string method, std::string req)
+	{
+		++v6_announces;
+		TEST_EQUAL(method, "GET");
+
+		char response[500];
+		int size = snprintf(response, sizeof(response), "d8:intervali1800e5:peers0:e");
+		return sim::send_response(200, "OK", size) + response;
+	});
+
+	{
+		lt::session_proxy zombie;
+
+		asio::io_service ios(sim, { address_v4::from_string("10.0.0.3")
+			, address_v6::from_string("ffff::1337") });
+		lt::settings_pack sett = settings();
+		std::unique_ptr<lt::session> ses(new lt::session(sett, ios));
+
+		ses->set_alert_notify(std::bind(&on_alert_notify, ses.get()));
+
+
+		lt::add_torrent_params p;
+		p.name = "test-torrent";
+		p.save_path = ".";
+		p.info_hash.assign("abababababababababab");
+
+//TODO: parameterize http vs. udp here
+		p.trackers.push_back("http://tracker.com:8080/announce");
+		ses->async_add_torrent(p);
+
+		// stop the torrent 5 seconds in
+		asio::high_resolution_timer stop(ios);
+		stop.expires_from_now(chrono::seconds(5));
+		stop.async_wait([&ses](boost::system::error_code const& ec)
+		{
+			std::vector<lt::torrent_handle> torrents = ses->get_torrents();
+			for (auto const& t : torrents)
+			{
+				t.pause();
+			}
+		});
+
+		// then shut down 10 seconds in
+		asio::high_resolution_timer terminate(ios);
+		terminate.expires_from_now(chrono::seconds(10));
+		terminate.async_wait([&ses,&zombie](boost::system::error_code const& ec)
+		{
+			zombie = ses->abort();
+			ses.reset();
+		});
+
+		sim.run();
+	}
+
+	// 2 because there's one announce on startup and one when shutting down
+	TEST_EQUAL(v4_announces, 2);
+	TEST_EQUAL(v6_announces, 2);
+}
+
 // TODO: test with different queuing settings
 // TODO: test when a torrent transitions from downloading to finished and
 // finished to seeding

src/session_impl.cpp

@@ -1940,7 +1940,9 @@ retry:
 				{
 					error_code err;
 					address test_family = address::from_string(device.c_str(), err);
-					if (!err && test_family.is_v4() != address_family)
+					if (!err
+						&& test_family.is_v4() != address_family
+						&& !is_any(test_family))
 						continue;
 
 					listen_socket_t s = setup_listener(device, address_family, port

src/torrent.cpp

@@ -3531,13 +3531,11 @@ namespace libtorrent
 		// do it if the bind IP for the tracker request that just completed
 		// matches one of the listen interfaces, since that means this
 		// announce was the second one
-		// don't connect twice just to tell it we're stopping
 
 		if (((!is_any(m_ses.get_ipv6_interface().address()) && tracker_ip.is_v4())
 			|| (!is_any(m_ses.get_ipv4_interface().address()) && tracker_ip.is_v6()))
 			&& r.bind_ip != m_ses.get_ipv4_interface().address()
-			&& r.bind_ip != m_ses.get_ipv6_interface().address()
-			&& r.event != tracker_request::stopped)
+			&& r.bind_ip != m_ses.get_ipv6_interface().address())
 		{
 			std::list<address>::const_iterator i = std::find_if(tracker_ips.begin()
 				, tracker_ips.end(), boost::bind(&address::is_v4, _1) != tracker_ip.is_v4());
@@ -3546,15 +3544,22 @@ namespace libtorrent
 				// the tracker did resolve to a different type of address, so announce
 				// to that as well
 
+				// TODO 2: there's a bug when removing a torrent or shutting down the session,
+				// where the second announce is skipped (in this case, the one to the IPv6
+				// name). This should be fixed by generalizing the tracker list structure to
+				// separate the IPv6 and IPv4 addresses as conceptually separate trackers,
+				// and they should be announced to in parallel
+
+				tracker_request req = r;
 				// tell the tracker to bind to the opposite protocol type
-				address bind_interface = tracker_ip.is_v4()
-					?m_ses.get_ipv6_interface().address()
-					:m_ses.get_ipv4_interface().address();
-				announce_with_tracker(r.event, bind_interface);
+				req.bind_ip = tracker_ip.is_v4()
+					? m_ses.get_ipv6_interface().address()
+					: m_ses.get_ipv4_interface().address();
 #ifndef TORRENT_DISABLE_LOGGING
 				debug_log("announce again using %s as the bind interface"
-					, print_address(bind_interface).c_str());
+					, print_address(req.bind_ip).c_str());
 #endif
+				m_ses.queue_tracker_request(req, shared_from_this());
 			}
 		}