Issue in snmpv2 walk while filling handler context name( netsnmp_handler_registration_create->contextName)

[Lakshmipathy, Sridhar]

Hi ,

I am new to Netsnmp,  I adding the context support .

I am facing issue in snmpv2 walk , If I filling  the context Name during the 
registration table .
I am not able do the walk for register table , It only accessible in context 
based walk ,
So what I need to add , for support the default walk .  So please help me if I 
missed anything .

  Handler =    netsnmp_baby_steps_access_multiplexer_get(access_multiplexer);
    reginfo = netsnmp_handler_registration_create(
        "ifTable", handler, ifTable_oid, ifTable_oid_size,
        HANDLER_CAN_BABY_STEP | HANDLER_CAN_RONLY);

    if (NULL == reginfo) {
        snmp_log(LOG_ERR, "error registering table ifTable\n");
        return;
    }

    reginfo->my_reg_void = &ifTable_if_ctx;

  if(snmp_ctx != NULL)
  {
    reginfo->contextName = strdup(snmp_ctx);
  }
if (access_multiplexer->object_lookup)
        mfd_modes |= BABY_STEP_OBJECT_LOOKUP;
    if (access_multiplexer->pre_request)
        mfd_modes |= BABY_STEP_PRE_REQUEST;
    if (access_multiplexer->post_request)
        mfd_modes |= BABY_STEP_POST_REQUEST;

    handler = netsnmp_baby_steps_handler_get(mfd_modes);
    netsnmp_inject_handler(reginfo, handler);

    handler = netsnmp_get_row_merge_handler(reginfo->rootoid_len + 2);
    netsnmp_inject_handler(reginfo, handler);

    handler = netsnmp_container_table_handler_get(
        tbl_info, ifTable_if_ctx.container, TABLE_CONTAINER_KEY_NETSNMP_INDEX);
    netsnmp_inject_handler(reginfo, handler);

    if (NULL != ifTable_if_ctx.cache) {
        handler = netsnmp_cache_handler_get(ifTable_if_ctx.cache);
        netsnmp_inject_handler(reginfo, handler);
netsnmp_register_table(reginfo, tbl_info);


I have wrapper will fil the context name ,
However during initialization I will pass context as NULL. So I assumed there 
will be table registration without context name .

My snmpwalk output:
bash-4.3# snmpwalk -v2c -cpublic localhost 1.3.6.1.2.1.2.2.1.2.1
IF-MIB::ifEntry = No Such Object available on this agent at this OID

bash-4.3# snmpwalk -v3 -u test1 -l authPriv -a MD5 -A 'password' -x DES -X 
'password' -n "" localhost 1.3.6.1.2.1.2.2.1.2.1
IF-MIB::ifEntry = No Such Object available on this agent at this OID

bash-4.3#snmpwalk -v3 -u test1 -l authPriv -a MD5 -A 'password' -x DES -X 
'password' -n "snmp_context" localhost 1.3.6.1.2.1.2.2.1.2.1
IF-MIB::ifDescr.1 = STRING:
IF-MIB::ifSpecific.2 = No more variables left in this MIB View (It is past the 
end of the MIB tree)

If I am comment above  line , I can able to do the walk .

Regards,
Sridhar .L

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