don't use unreachable RI after 1 hour

NetDb.cpp

@@ -259,6 +259,7 @@ namespace data
 		m_Floodfills.clear ();	
 
 		// load routers now
+		uint64_t ts = i2p::util::GetMillisecondsSinceEpoch ();	
 		int numRouters = 0;
 		boost::filesystem::directory_iterator end;
 		for (boost::filesystem::directory_iterator it (p); it != end; ++it)
@@ -273,7 +274,7 @@ namespace data
 					const std::string& fullPath = it1->path();
 #endif
 					RouterInfo * r = new RouterInfo(fullPath);
-					if (!r->IsUnreachable ())
+					if (!r->IsUnreachable () && (!r->UsesIntroducer () || ts < r->GetTimestamp () + 3600*1000LL)) // 1 hour
 					{	
 						r->DeleteBuffer ();
 						m_RouterInfos[r->GetIdentHash ()] = r;
@@ -329,8 +330,10 @@ namespace data
 			}
 			else 
 			{
+				// RouterInfo expires after 1 hour if uses introducer
+				if ((it.second->UsesIntroducer () && ts > it.second->GetTimestamp () + 3600*1000LL) // 1 hour
 				// RouterInfo expires in 72 hours if more than 300
-				if (total > 300 && ts > it.second->GetTimestamp () + 3*24*3600*1000LL) // 3 days
+					|| (total > 300 && ts > it.second->GetTimestamp () + 3*24*3600*1000LL)) // 3 days
 				{	
 					total--;
 					it.second->SetUnreachable (true);

RouterInfo.cpp

@@ -257,6 +257,9 @@ namespace data
 				case 'H':
 					m_Caps |= Caps::eHidden;
 				break;	
+				case 'U':
+					m_Caps |= Caps::eUnreachable;
+				break;	
 				default: ;
 			}	
 			cap++;
@@ -465,7 +468,7 @@ namespace data
 
 	bool RouterInfo::UsesIntroducer () const
 	{
-		return !(m_Caps & Caps::eReachable); // non-reachable
+		return m_Caps & Caps::eUnreachable; // non-reachable
 	}		
 		
 	const RouterInfo::Address * RouterInfo::GetNTCPAddress (bool v4only) const

RouterInfo.h

@@ -33,7 +33,8 @@ namespace data
 				eReachable = 0x04,
 				eSSUTesting = 0x08,
 				eSSUIntroducer = 0x10,
-				eHidden = 0x20
+				eHidden = 0x20,
+				eUnreachable = 0x40
 			};
 
 			enum TransportStyle