select ipv6 random introducer

libi2pd/NetDb.cpp

@@ -1168,12 +1168,12 @@ namespace data
 			});
 	}
 
-	std::shared_ptr<const RouterInfo> NetDb::GetRandomIntroducer () const
+	std::shared_ptr<const RouterInfo> NetDb::GetRandomIntroducer (bool v4) const
 	{
 		return GetRandomRouter (
-			[](std::shared_ptr<const RouterInfo> router)->bool
+			[v4](std::shared_ptr<const RouterInfo> router)->bool
 			{
-				return router->IsIntroducer (true) && !router->IsHidden () && !router->IsFloodfill (); // floodfills don't send relay tag
+				return router->IsIntroducer (v4) && !router->IsHidden () && !router->IsFloodfill (); // floodfills don't send relay tag
 			});
 	}
 

libi2pd/NetDb.hpp

@@ -87,7 +87,7 @@ namespace data
 			std::shared_ptr<const RouterInfo> GetHighBandwidthRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith, bool reverse) const;
 			std::shared_ptr<const RouterInfo> GetRandomPeerTestRouter (bool v4, const std::set<IdentHash>& excluded) const;
 			std::shared_ptr<const RouterInfo> GetRandomSSUV6Router () const; // TODO: change to v6 peer test later
-			std::shared_ptr<const RouterInfo> GetRandomIntroducer () const;
+			std::shared_ptr<const RouterInfo> GetRandomIntroducer (bool v4) const;
 			std::shared_ptr<const RouterInfo> GetClosestFloodfill (const IdentHash& destination, const std::set<IdentHash>& excluded, bool closeThanUsOnly = false) const;
 			std::vector<IdentHash> GetClosestFloodfills (const IdentHash& destination, size_t num,
 				std::set<IdentHash>& excluded, bool closeThanUsOnly = false) const;

libi2pd/SSU.cpp

@@ -794,10 +794,10 @@ namespace transport
 				std::set<std::shared_ptr<const i2p::data::RouterInfo> > requested;
 				for (auto i = introducers.size (); i < SSU_MAX_NUM_INTRODUCERS; i++)
 				{	
-					auto introducer = i2p::data::netdb.GetRandomIntroducer ();
+					auto introducer = i2p::data::netdb.GetRandomIntroducer (v4);
 					if (introducer && !requested.count (introducer)) // not requested already
 					{	
-						auto address = introducer->GetSSUAddress (true); // v4
+						auto address = v4 ? introducer->GetSSUAddress (true) : introducer->GetSSUV6Address ();
 						if (address && !address->host.is_unspecified ())
 						{
 							boost::asio::ip::udp::endpoint ep (address->host, address->port);