some more IPv6 support

src/broadcast_socket.cpp

@@ -43,7 +43,7 @@ namespace libtorrent
 {
 	bool is_local(address const& a)
 	{
-		if (a.is_v6()) return false;
+		if (a.is_v6()) return a.to_v6().is_link_local();
 		address_v4 a4 = a.to_v4();
 		unsigned long ip = a4.to_ulong();
 		return ((ip & 0xff000000) == 0x0a000000
@@ -58,15 +58,32 @@ namespace libtorrent
 		udp::resolver::iterator i = r.resolve(udp::resolver::query(asio::ip::host_name(), "0"));
 		for (;i != udp::resolver_iterator(); ++i)
 		{
-			// ignore the loopback
-			if (i->endpoint().address() == address_v4((127 << 24) + 1)) continue;
+			address const& a = i->endpoint().address();
 			// ignore non-IPv4 addresses
-			if (i->endpoint().address().is_v4()) break;
+			if (!a.is_v4()) break;
+			// ignore the loopback
+			if (a.to_v4() == address_v4::loopback()) continue;
 		}
 		if (i == udp::resolver_iterator()) return address_v4::any();
 		return i->endpoint().address().to_v4();
 	}
 
+	bool is_loopback(address const& addr)
+	{
+		if (addr.is_v4())
+		  return addr.to_v4() == address_v4::loopback();
+		else
+			return addr.to_v6() == address_v6::loopback();
+	}
+
+	bool is_multicast(address const& addr)
+	{
+		if (addr.is_v4())
+			return addr.to_v4().is_multicast();
+		else
+			return addr.to_v6().is_multicast();
+	}
+
 	broadcast_socket::broadcast_socket(asio::io_service& ios
 		, udp::endpoint const& multicast_endpoint
 		, receive_handler_t const& handler
@@ -74,8 +91,7 @@ namespace libtorrent
 		: m_multicast_endpoint(multicast_endpoint)
 		, m_on_receive(handler)
 	{
-		assert(m_multicast_endpoint.address().is_v4());
-		assert(m_multicast_endpoint.address().to_v4().is_multicast());
+		assert(is_multicast(m_multicast_endpoint.address()));
 
 		using namespace asio::ip::multicast;
 	
@@ -86,21 +102,39 @@ namespace libtorrent
 			, end(interfaces.end()); i != end; ++i)
 		{
 			// only broadcast to IPv4 addresses that are not local
-			if (!i->is_v4() || !is_local(*i)) continue;
-			// ignore the loopback interface
-			if (i->to_v4() == address_v4((127 << 24) + 1)) continue;
+			if (!is_local(*i)) continue;
+			// only multicast on compatible networks
+			if (i->is_v4() != multicast_endpoint.address().is_v4()) continue;
+			// ignore any loopback interface
+			if (is_loopback(*i)) continue;
 
 			boost::shared_ptr<datagram_socket> s(new datagram_socket(ios));
-			s->open(udp::v4(), ec);
-			if (ec) continue;
-			s->set_option(datagram_socket::reuse_address(true), ec);
-			if (ec) continue;
-			s->bind(udp::endpoint(address_v4::any(), multicast_endpoint.port()), ec);
-			if (ec) continue;
-			s->set_option(join_group(multicast_endpoint.address()), ec);
-			if (ec) continue;
-			s->set_option(outbound_interface(i->to_v4()), ec);
-			if (ec) continue;
+			if (i->is_v4())
+			{
+				s->open(udp::v4(), ec);
+				if (ec) continue;
+				s->set_option(datagram_socket::reuse_address(true), ec);
+				if (ec) continue;
+				s->bind(udp::endpoint(address_v4::any(), multicast_endpoint.port()), ec);
+				if (ec) continue;
+				s->set_option(join_group(multicast_endpoint.address()), ec);
+				if (ec) continue;
+				s->set_option(outbound_interface(i->to_v4()), ec);
+				if (ec) continue;
+			}
+			else
+			{
+				s->open(udp::v6(), ec);
+				if (ec) continue;
+				s->set_option(datagram_socket::reuse_address(true), ec);
+				if (ec) continue;
+				s->bind(udp::endpoint(address_v6::any(), multicast_endpoint.port()), ec);
+				if (ec) continue;
+				s->set_option(join_group(multicast_endpoint.address()), ec);
+				if (ec) continue;
+//				s->set_option(outbound_interface(i->to_v6()), ec);
+//				if (ec) continue;
+			}
 			s->set_option(hops(255), ec);
 			if (ec) continue;
 			s->set_option(enable_loopback(loopback), ec);

src/bt_peer_connection.cpp

@@ -50,6 +50,7 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "libtorrent/version.hpp"
 #include "libtorrent/extensions.hpp"
 #include "libtorrent/aux_/session_impl.hpp"
+#include "libtorrent/enum_net.hpp"
 
 #ifndef TORRENT_DISABLE_ENCRYPTION
 #include "libtorrent/pe_crypto.hpp"
@@ -1474,6 +1475,19 @@ namespace libtorrent
 		detail::write_address(remote().address(), out);
 		handshake["yourip"] = remote_address;
 		handshake["reqq"] = m_ses.settings().max_allowed_in_request_queue;
+		asio::error_code ec;
+		std::vector<address> const& interfaces = enum_net_interfaces(get_socket()->io_service(), ec);
+		for (std::vector<address>::const_iterator i = interfaces.begin()
+			, end(interfaces.end()); i != end; ++i)
+		{
+			// TODO: only use global IPv6 addresses
+			if (!i->is_v6() || i->to_v6().is_link_local()) continue;
+			std::string ipv6_address;
+			std::back_insert_iterator<std::string> out(ipv6_address);
+			detail::write_address(*i, out);
+			handshake["ipv6"] = ipv6_address;
+			break;
+		}
 
 		// loop backwards, to make the first extension be the last
 		// to fill in the handshake (i.e. give the first extensions priority)

src/http_tracker_connection.cpp

@@ -890,12 +890,7 @@ namespace libtorrent
 
 					peer_entry p;
 					p.pid.clear();
-					std::stringstream ip_str;
-					ip_str << (int)detail::read_uint8(i) << ".";
-					ip_str << (int)detail::read_uint8(i) << ".";
-					ip_str << (int)detail::read_uint8(i) << ".";
-					ip_str << (int)detail::read_uint8(i);
-					p.ip = ip_str.str();
+					p.ip = detail::read_v4_address(i).to_string();
 					p.port = detail::read_uint16(i);
 					peer_list.push_back(p);
 				}
@@ -910,6 +905,22 @@ namespace libtorrent
 				}
 			}
 
+			if (entry const* ipv6_peers = e.find_key("peers6"))
+			{
+				std::string const& peers = ipv6_peers->string();
+				for (std::string::const_iterator i = peers.begin();
+					i != peers.end();)
+				{
+					if (std::distance(i, peers.end()) < 18) break;
+					
+					peer_entry p;
+					p.pid.clear();
+					p.ip = detail::read_v6_address(i).to_string();
+					p.port = detail::read_uint16(i);
+					peer_list.push_back(p);
+				}
+			}
+
 			// look for optional scrape info
 			int complete = -1;
 			int incomplete = -1;

src/ut_pex.cpp

@@ -67,8 +67,6 @@ namespace libtorrent { namespace
 		if (!p.is_local()) return false;
 		// don't send out peers that we haven't successfully connected to
 		if (p.is_connecting()) return false;
-		// ut pex does not support IPv6
-		if (!p.remote().address().is_v4()) return false;
 		return true;
 	}
 
@@ -98,9 +96,15 @@ namespace libtorrent { namespace
 			std::string& pla = pex["added"].string();
 			std::string& pld = pex["dropped"].string();
 			std::string& plf = pex["added.f"].string();
+			std::string& pla6 = pex["added6"].string();
+			std::string& pld6 = pex["dropped6"].string();
+			std::string& plf6 = pex["added6.f"].string();
 			std::back_insert_iterator<std::string> pla_out(pla);
 			std::back_insert_iterator<std::string> pld_out(pld);
 			std::back_insert_iterator<std::string> plf_out(plf);
+			std::back_insert_iterator<std::string> pla6_out(pla6);
+			std::back_insert_iterator<std::string> pld6_out(pld6);
+			std::back_insert_iterator<std::string> plf6_out(plf6);
 
 			std::set<tcp::endpoint> dropped;
 			m_old_peers.swap(dropped);
@@ -123,8 +127,6 @@ namespace libtorrent { namespace
 					bt_peer_connection* p = dynamic_cast<bt_peer_connection*>(i->second);
 					if (!p) continue;
 
-					// i->first was added since the last time
-					detail::write_endpoint(i->first, pla_out);
 					// no supported flags to set yet
 					// 0x01 - peer supports encryption
 					// 0x02 - peer is a seed
@@ -132,7 +134,17 @@ namespace libtorrent { namespace
 #ifndef TORRENT_DISABLE_ENCRYPTION
 					flags |= p->supports_encryption() ? 1 : 0;
 #endif
-					detail::write_uint8(flags, plf_out);
+					// i->first was added since the last time
+					if (i->first.address().is_v4())
+					{
+						detail::write_endpoint(i->first, pla_out);
+						detail::write_uint8(flags, plf_out);
+					}
+					else
+					{
+						detail::write_endpoint(i->first, pla6_out);
+						detail::write_uint8(flags, plf6_out);
+					}
 					++num_added;
 				}
 				else
@@ -146,8 +158,10 @@ namespace libtorrent { namespace
 			for (std::set<tcp::endpoint>::const_iterator i = dropped.begin()
 				, end(dropped.end());i != end; ++i)
 			{	
-				if (!i->address().is_v4()) continue;
-				detail::write_endpoint(*i, pld_out);
+				if (i->address().is_v4())
+					detail::write_endpoint(*i, pld_out);
+				else
+					detail::write_endpoint(*i, pld6_out);
 			}
 
 			m_ut_pex_msg.clear();
@@ -227,6 +241,28 @@ namespace libtorrent { namespace
 					char flags = detail::read_uint8(fin);
 					p.peer_from_tracker(adr, pid, peer_info::pex, flags);
 				} 
+
+				if (entry const* p6 = pex_msg.find_key("added6"))
+				{
+					std::string const& peers6 = p6->string();
+					std::string const& peer6_flags = pex_msg["added6.f"].string();
+					
+					int num_peers = peers6.length() / 18;
+					char const* in = peers6.c_str();
+					char const* fin = peer6_flags.c_str();
+
+					if (int(peer6_flags.size()) != num_peers)
+						return true;
+
+					peer_id pid(0);
+					policy& p = m_torrent.get_policy();
+					for (int i = 0; i < num_peers; ++i)
+					{
+						tcp::endpoint adr = detail::read_v6_endpoint<tcp::endpoint>(in);
+						char flags = detail::read_uint8(fin);
+						p.peer_from_tracker(adr, pid, peer_info::pex, flags);
+					} 
+				}
 			}
 			catch (std::exception&)
 			{
@@ -279,8 +315,13 @@ namespace libtorrent { namespace
 			pex["dropped"].string();
 			std::string& pla = pex["added"].string();
 			std::string& plf = pex["added.f"].string();
+			pex["dropped6"].string();
+			std::string& pla6 = pex["added6"].string();
+			std::string& plf6 = pex["added6.f"].string();
 			std::back_insert_iterator<std::string> pla_out(pla);
 			std::back_insert_iterator<std::string> plf_out(plf);
+			std::back_insert_iterator<std::string> pla6_out(pla6);
+			std::back_insert_iterator<std::string> plf6_out(plf6);
 
 			int num_added = 0;
 			for (torrent::peer_iterator i = m_torrent.begin()
@@ -295,8 +336,6 @@ namespace libtorrent { namespace
 				bt_peer_connection* p = dynamic_cast<bt_peer_connection*>(i->second);
 				if (!p) continue;
 
-				// i->first was added since the last time
-				detail::write_endpoint(i->first, pla_out);
 				// no supported flags to set yet
 				// 0x01 - peer supports encryption
 				// 0x02 - peer is a seed
@@ -304,7 +343,17 @@ namespace libtorrent { namespace
 #ifndef TORRENT_DISABLE_ENCRYPTION
 				flags |= p->supports_encryption() ? 1 : 0;
 #endif
-				detail::write_uint8(flags, plf_out);
+				// i->first was added since the last time
+				if (i->first.address().is_v4())
+				{
+					detail::write_endpoint(i->first, pla_out);
+					detail::write_uint8(flags, plf_out);
+				}
+				else
+				{
+					detail::write_endpoint(i->first, pla6_out);
+					detail::write_uint8(flags, plf6_out);
+				}
 				++num_added;
 			}
 			std::vector<char> pex_msg;