add/remove SSU2 introducers to local RouterInfo

libi2pd/RouterContext.cpp

@@ -461,6 +461,20 @@ namespace i2p
 			UpdateRouterInfo ();
 	}
 
+	bool RouterContext::AddSSU2Introducer (const i2p::data::RouterInfo::Introducer& introducer, bool v4)
+	{
+		bool ret = m_RouterInfo.AddSSU2Introducer (introducer, v4);
+		if (ret)
+			UpdateRouterInfo ();
+		return ret;
+	}
+		
+	void RouterContext::RemoveSSU2Introducer (const i2p::data::IdentHash& h, bool v4)
+	{
+		if (m_RouterInfo.RemoveSSU2Introducer (h, v4))
+			UpdateRouterInfo ();
+	}	
+		
 	void RouterContext::SetFloodfill (bool floodfill)
 	{
 		m_IsFloodfill = floodfill;

libi2pd/RouterContext.h

@@ -123,6 +123,8 @@ namespace garlic
 			void RemoveNTCPAddress (bool v4only = true); // delete NTCP address for older routers. TODO: remove later
 			bool AddIntroducer (const i2p::data::RouterInfo::Introducer& introducer);
 			void RemoveIntroducer (const boost::asio::ip::udp::endpoint& e);
+			bool AddSSU2Introducer (const i2p::data::RouterInfo::Introducer& introducer, bool v4);
+			void RemoveSSU2Introducer (const i2p::data::IdentHash& h, bool v4);
 			bool IsUnreachable () const;
 			void SetUnreachable (bool v4, bool v6);
 			void SetReachable (bool v4, bool v6);

libi2pd/RouterInfo.cpp

@@ -1478,5 +1478,40 @@ namespace data
 	{
 		return std::make_shared<Buffer> ();
 	}
+
+	bool LocalRouterInfo::AddSSU2Introducer (const Introducer& introducer, bool v4)
+	{
+		for (auto& addr : GetAddresses ())
+		{
+			if (addr->IsSSU2 () && ((v4 && addr->IsV4 ()) || (!v4 && addr->IsV6 ())))
+			{
+				for (auto& intro: addr->ssu->introducers)
+					if (intro.iTag == introducer.iTag) return false; // already presented
+				addr->ssu->introducers.push_back (introducer);
+				SetReachableTransports (GetReachableTransports () | ((addr->IsV4 () ? eSSU2V4 : eSSU2V6)));
+				return true;
+			}
+		}
+		return false;
+	}	
+
+	bool LocalRouterInfo::RemoveSSU2Introducer (const IdentHash& h, bool v4)
+	{
+		for (auto& addr: GetAddresses ())
+		{
+			if (addr->IsSSU2 () && ((v4 && addr->IsV4 ()) || (!v4 && addr->IsV6 ())))
+			{
+				for (auto it = addr->ssu->introducers.begin (); it != addr->ssu->introducers.end (); ++it)
+					if (h == it->iKey)
+					{
+						addr->ssu->introducers.erase (it);
+						if (addr->ssu->introducers.empty ())
+							SetReachableTransports (GetReachableTransports () & ~(addr->IsV4 () ? eSSU2V4 : eSSU2V6));
+						return true;
+					}
+			}
+		}
+		return false;
+	}	
 }
 }

libi2pd/RouterInfo.h

@@ -275,6 +275,8 @@ namespace data
 			void SetBufferLen (size_t len) { m_BufferLen = len; };
 			void RefreshTimestamp ();
 			const Addresses& GetAddresses () const { return *m_Addresses; };
+			CompatibleTransports GetReachableTransports () const { return m_ReachableTransports; };
+			void SetReachableTransports (CompatibleTransports transports) { m_ReachableTransports = transports; };		
 
 		private:
 
@@ -317,6 +319,9 @@ namespace data
 			std::string GetProperty (const std::string& key) const;
 			void ClearProperties () override { m_Properties.clear (); };
 
+			bool AddSSU2Introducer (const Introducer& introducer, bool v4);
+			bool RemoveSSU2Introducer (const IdentHash& h, bool v4);
+			
 		private:
 
 			void WriteToStream (std::ostream& s) const;

libi2pd/SSU2.cpp

@@ -770,8 +770,11 @@ namespace transport
 					newList.push_back (it);
 					excluded.insert (it->GetRemoteIdentity ()->GetIdentHash ());
 				}	
-				// TODO: remove introducer
+				else
+					i2p::context.RemoveSSU2Introducer (it->GetRemoteIdentity ()->GetIdentHash (), it->GetAddress ()->IsV4 ());
 			}	
+			else
+				i2p::context.RemoveSSU2Introducer (it->GetRemoteIdentity ()->GetIdentHash (), it->GetAddress ()->IsV4 ());	
 		}	
 		if (newList.size () < SSU2_MAX_NUM_INTRODUCERS)
 		{
@@ -789,11 +792,18 @@ namespace transport
 						
 			for (const auto& it : sessions)
 			{
-				// TODO: add introducer
+				i2p::data::RouterInfo::Introducer introducer;
+				introducer.iTag = it->GetRelayTag ();
+				introducer.iKey = it->GetRemoteIdentity ()->GetIdentHash ();
+				introducer.iExp = it->GetCreationTime () + SSU2_TO_INTRODUCER_SESSION_EXPIRATION;
+				excluded.insert (it->GetRemoteIdentity ()->GetIdentHash ());
+				if (i2p::context.AddSSU2Introducer (introducer, it->GetAddress ()->IsV4 ()))
+				{
 					newList.push_back (it);
 					if (newList.size () >= SSU2_MAX_NUM_INTRODUCERS) break;
 				}	
 			}	
+		}	
 		introducers = newList;
 
 		if (introducers.size () < SSU2_MAX_NUM_INTRODUCERS)