limit number of transit tunnels

I2NPProtocol.cpp

@@ -280,7 +280,8 @@ namespace i2p
 			
 				i2p::crypto::ElGamalDecrypt (i2p::context.GetEncryptionPrivateKey (), record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, clearText);
 				// replace record to reply			
-				if (i2p::context.AcceptsTunnels ())
+				if (i2p::context.AcceptsTunnels () && 
+					i2p::tunnel::tunnels.GetTransitTunnels ().size () <= MAX_NUM_TRANSIT_TUNNELS)
 				{	
 					i2p::tunnel::TransitTunnel * transitTunnel = 
 						i2p::tunnel::CreateTransitTunnel (

I2NPProtocol.h

@@ -97,6 +97,8 @@ namespace i2p
 	const uint8_t DATABASE_LOOKUP_TYPE_ROUTERINFO_LOOKUP = 0x08; // 1000			
 	const uint8_t DATABASE_LOOKUP_TYPE_EXPLORATORY_LOOKUP = 0x0C; // 1100
 
+	const int MAX_NUM_TRANSIT_TUNNELS = 1500;
+
 namespace tunnel
 {		
 	class InboundTunnel;

I2PControl.cpp

@@ -309,7 +309,7 @@ namespace client
 
 	void I2PControlService::TunnelsParticipatingHandler (std::map<std::string, std::string>& results)
 	{
-		results[I2P_CONTROL_ROUTER_INFO_TUNNELS_PARTICIPATING] = boost::lexical_cast<std::string>(i2p::tunnel::tunnels.GetTransitTunnels ().size ());;
+		results[I2P_CONTROL_ROUTER_INFO_TUNNELS_PARTICIPATING] = boost::lexical_cast<std::string>(i2p::tunnel::tunnels.GetTransitTunnels ().size ());
 	}
 
 // RouterManager