[SNMP4J] Receiving snmpv3 trap using custom listener [How to?]

[Frank Fock]

Hi Simon,

Your approach will not work for SNMPv3.
For SNMPv3 you need to implement your own
TransportMapping that wraps your existing
transport.

Best regards,
Frank

simon sew wrote:
> 
> 
> Hi there,
> 
> I’ve just started learning about SNMP4j.
> 
>  
> 
> Currently I have this problem.
> 
> I would like to integrate the SNMP4j into my existing
> application.
> 
> The problem now is that we have already have an existing
> TCP/UDP listener.
> 
> If possible, we would like to keep it as usual.
> 
>  
> 
> I tried to bypass your listener and it works for snmp v1 and
> v2c.
> 
> However when I tried with v3. It wont work. I can received
> the log but it didn’t get processed.
> 
>  
> 
> Could you redirect me into the correct path.
> 
>  
> 
> Regards,
> 
> Simon
> 
>  
> 
> P/S : Here is some of the my code. (Sorry for my bad
> English)
> 
>  
> 
>            
> threadPool = ThreadPool.create("Trap", 2);
> 
>            
> dispatcher = new
> MultiThreadedMessageDispatcher(threadPool,
> 
>                        
> new
> MessageDispatcherImpl());
> 
>            
> listenAddress =
> GenericAddress.parse(System.getProperty(
> 
>                        
> "snmp4j.listenAddress", "udp:0.0.0.0/0"));
> 
>  
> 
>            
> if (listenAddress instanceof UdpAddress) {
> 
>                  
> transport = new
> DefaultUdpTransportMapping(
> 
>                              
> (UdpAddress) listenAddress);
> 
>            
> } else {
> 
>                  
> transport = new
> DefaultTcpTransportMapping(
> 
>                              
> (TcpAddress) listenAddress);
> 
>            
> }
> 
>  
> 
>            
> snmp = new Snmp(dispatcher, transport);
> 
>            
> snmp.getMessageDispatcher().addMessageProcessingModel(new MPv1());
> 
>            
> snmp.getMessageDispatcher().addMessageProcessingModel(new MPv2c());
> 
>  
> 
>      
>     SecurityProtocols.getInstance().addDefaultProtocols();
> 
>            
> byte[] localEngineID
> = ((MPv3) snmp.getMessageProcessingModel(MessageProcessingModel.MPv3)).createLocalEngineID();
> 
>            
> USM usm = new USM(SecurityProtocols.getInstance(), new OctetString(
> 
>                        
> localEngineID), 0);
> 
>            
> SecurityModels.getInstance().addSecurityModel(usm);
> 
>            
> snmp.setLocalEngine(localEngineID,
> 0, 0);
> 
>  
> 
>            
> usm.addUser(
> 
>                        
> new OctetString("simon_user"),
> 
>                        
> new UsmUser(new OctetString("simon_user"),
> 
>                        
> AuthMD5.ID, 
> 
>                        
> new OctetString("simon_password"),
> 
>                        
> PrivDES.ID, 
> 
>                        
> new OctetString("simon_des")));
> 
>            
> snmp.getMessageDispatcher().addMessageProcessingModel(new MPv3());
> 
>  
> 
>            
> snmp.addCommandResponder(this);
> 
>  
> 
>            
> //I use this to bypass the listener (works for v1,v2c not v3)
> 
>                        
> ((DefaultUdpTransportMapping) transport).fireProcessMessage(
> 
>                                    
> new
> UdpAddress(InetAddress.getByName("192.168.2.157"), 162),
> 
>                                    
> bis);
> 
>  
> 
>                                
> ...
> 
>      
>       public void
> processPdu(CommandResponderEvent event) {
> 
>                                
> ….
> 
> 
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