Re: Dynmically retrieving only objects with real values?

On 09/01/07, Wilson, Dave <[email protected]> wrote:
>                                          However, I do not
> want to return entries if they have no value, so in this example, I won't
> return statsname.4, but the walk will go onto the next category.  I do this
> by using code like this in the var_CommonStatsTable function:
>
>     case STATSNAME:
>         strcpy (string, tempPTR->Name);
>         *var_len = strlen(string);
>         if ( strlen(string) == 0 ) return NULL;
>         return (unsigned char *) string;

I would suggest not updating '*var_len' until after you've
checked whether this entry is valid.   It probably doesn't
make a difference, but

     case STATSNAME:
         strcpy (string, tempPTR->Name);
         if ( strlen(string) == 0 ) return NULL;
         *var_len = strlen(string);
         return (unsigned char *) string;

would be slightly safer


> This works fine for strings, but not counters because I sometimes want to
> return objects with values of 0, eg. statsval.1, but I don't want to return
> statsval.4.
>
> How do I do this so that both snmpwalk and a specific snmpget (eg. on
> statsval.3) will work?

Use exactly the same test as above:

     case STATSVALUE:
         if ( strlen(tempPTR->Name) == 0 ) return NULL;      <====
         long_ret = tempPTR->Value;
         return (unsigned char *) &long_ret;

Dave

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