router with expired introducer is still valid

libi2pd/NetDb.cpp

@@ -473,14 +473,15 @@ namespace data
 	bool NetDb::LoadRouterInfo (const std::string & path)
 	{
 		auto r = std::make_shared<RouterInfo>(path);
-		if (r->GetRouterIdentity () && !r->IsUnreachable () &&
-			(r->IsReachable () || !r->IsSSU (false) || m_LastLoad < r->GetTimestamp () + NETDB_INTRODUCEE_EXPIRATION_TIMEOUT*1000LL)) // 1 hour
-		{
+		if (r->GetRouterIdentity () && !r->IsUnreachable () && r->HasValidAddresses ())
+		{	
 			r->DeleteBuffer ();
 			r->ClearProperties (); // properties are not used for regular routers
-			m_RouterInfos[r->GetIdentHash ()] = r;
-			if (r->IsFloodfill () && r->IsReachable ()) // floodfill must be reachable
-				m_Floodfills.push_back (r);
+			if (m_RouterInfos.emplace (r->GetIdentHash (), r).second)
+			{	
+				if (r->IsFloodfill () && r->IsEligibleFloodfill ())
+					m_Floodfills.push_back (r);
+			}	
 		}
 		else
 		{

libi2pd/RouterInfo.cpp

@@ -343,7 +343,8 @@ namespace data
 						int numValid = 0;
 						for (auto& it: address->ssu->introducers)
 						{
-							if ((!it.iExp || ts <= it.iExp) && it.iPort > 0 && 
+							if (!it.iExp) it.iExp = m_Timestamp/1000 + NETDB_INTRODUCEE_EXPIRATION_TIMEOUT;
+							if (ts <= it.iExp && it.iPort > 0 && 
 							    ((it.iHost.is_v4 () && address->IsV4 ()) || (it.iHost.is_v6 () && address->IsV6 ()))) 
 								numValid++;
 							else