Re: Debugging SNMP

Thats correct, its the netsnmp_register_scalar which returns -1. Function netsnmp_create_handler_registration returns a pointer to an netsnmp_handler_registration. I have also tried to output the handler memory address, and its not always unique. Don't know if it has anything to do with the problem. My hypothesis is that perhaps it doesn't create an unique handler for each scalar. 


Could I create an netsnmp_handler_registration without the helper-function netsnmp_create_handler_registration? Perhaps that would solve the problem. 


Packaged dump output. Doesn't look like have any information about the scalar registration as I can see. 

dumph_send: AgentX Header 
dumpx_send: 01 03 00 00 
dumpv_send: Version: 1 
dumpv_send: Command: 3 (Register) 
dumpv_send: Flags: 00 
dumph_send: Session ID 
dumpx_send: 1B 00 00 00 
dumpv_send: Integer: 27 (0x1B) 
dumph_send: Transaction ID 
dumpx_send: 00 00 00 00 
dumpv_send: Integer: 0 (0x00) 
dumph_send: Request ID 
dumpx_send: C1 E5 31 3A 
dumpv_send: Integer: 976348609 (0x3A31E5C1) 
dumph_send: Dummy Length :-( 
dumpx_send: 00 00 00 00 
dumpv_send: Integer: 0 (0x00) 
dumph_send: AgentX Payload 
dumph_send: (Un)Register Header 
dumpx_send: 00 7F 00 00 
dumpv_send: Timeout: 0 
dumpv_send: Priority: 127 
dumpv_send: Range SubID: 0 
dumph_send: (Un)Register Prefix 
dumpv_send: OID: iso 
dumph_send: OID Header 
dumpx_send: 01 00 00 00 
dumpv_send: # subids: 1 (0x01) 
dumpv_send: prefix: 0 (0x00) 
dumpv_send: inclusive: 0 (0x00) 
dumph_send: OID Segments 
dumpx_send: 01 00 00 00 
dumpv_send: Integer: 1 (0x01) 
dumpx_send:0C 00 00 00 
dumpv_send: Integer: 12 (0x0C) 
dumpx_recv:14 00 00 00 
dumpv_recv: Integer: 20 (0x14) 
dumph_recv: AgentX Header 
dumph_recv: Version 
dumpx_recv: 01 
dumpv_recv: Version: 1 
dumph_recv: Command 
dumpx_recv: 12 
dumpv_recv: Command: 18 (Response) 
dumph_recv: Flags 
dumpx_recv: 00 
dumpv_recv: Flags: 0x0 
dumph_recv: Reserved Byte 
dumpx_recv: 00 
dumpv_recv: Reserved: 0x0 
dumph_recv: Session ID 
dumpx_recv: 1B 00 00 00 
dumpv_recv: Integer: 27 (0x1B) 
dumph_recv: Transaction ID 
dumpx_recv: 00 00 00 00 
dumpv_recv: Integer: 0 (0x00) 
dumph_recv: Packet ID 
dumpx_recv: C1 E5 31 3A 
dumpv_recv: Integer: 976348609 (0x3A31E5C1) 
dumph_recv: Payload Length 
dumpx_recv: 14 00 00 00 
dumpv_recv: Integer: 20 (0x14) 
dumph_recv: PDU 
dumpx_recv: 7D EE 0D 00 
dumpv_recv: Integer: 913021 (0xDEE7D) 
dumpx_recv: 00 00 
dumpv_recv: Short: 0 (0x00) 
dumpx_recv: 00 00 
dumpv_recv: Short: 0 (0x00) 
dumph_recv: VarBindList 
dumph_recv: VarBind: 
dumph_recv: Type 
dumpx_recv: 05 00 
dumpv_recv: Short: 5 (0x05) 
dumph_recv: OID Header 
dumpx_recv: 01 00 00 00 
dumpv_recv: # subids: 1 (0x01) 
dumpv_recv: prefix: 0 (0x00) 
dumpv_recv: inclusive: 0 (0x00) 
dumph_recv: OID Segments 
dumpx_recv: 01 00 00 00 
dumpv_recv: Integer: 1 (0x01) 
dumpv_recv: OID: iso 

----- Original Message -----

Fra: "Dave Shield" <[email protected]> 
Til: "Sverre Moe" <[email protected]> 
Kopi: "net-snmp-users" <[email protected]> 
Sendt: 29. oktober 2012 11:20:30 
Emne: Re: Debugging SNMP 

On 29 October 2012 10:10, Sverre Moe <[email protected]> wrote: 
> I have tried to seperate the registration call into two separate statements, 
> same result. None of these are actually failing. When I call 
> netsnmp_register_scalar(handler), it returns -1 which is 
> MIB_DUPLICATE_REGISTRATION. 

So the 'netsnmp_create_handler_registration' call succeeds 
(returns a non-null value), but the 'netsnmp_register_scalar' 
call fails (returns -1) - correct? 


> How do I "Turn on packet dumps in the AgentX subagent" ? 

Either 
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, 
NETSNMP_DS_LIB_DUMP_PACKET, 
++snmp_dump_packet); 
or 
debug_register_tokens("dump"); 
snmp_set_do_debugging(1); 

Put one or other of these statements into the main block of your 
subagent code - before the 'init_snmp' and similar setup. 
The first will turn on raw packet dumps (which are more compact, 
but less immediately meaningful). The second enables "parsed 
dumps" which are probably easier to follow, if a little verbose. 

If you're not sure what you are seeing, post the text of these dumps, 
together with what you think the OIDs being registered should be. 

Dave 



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