How to index a table with a string

Toth, Gregory S Tue, 19 Sep 2006 09:05:37 -0700

Title: Message

I am attempting to implement a mib module where there is a table indexed by a string (version 5.0.6). For demo purposes, it is currently a table of books indexed by titles.

I have attempted to implement the bookTable_get_first_data_point and bookTable_get_next_data_point methods similar to how I have implemented similar methods when the table was indexed by a integer (only using character arrays rather than integers):

/*****************************************************************/

bookTable_get_first_data_point(void **my_loop_context,
                               void **my_data_context,
                               netsnmp_variable_list * put_index_data,
                               netsnmp_iterator_info *mydata)
{

netsnmp_variable_list *vptr;

subtree_context_cache *context_ptr;
context_ptr = get_top_context_cache();

if (!context_ptr)
return NULL;

    vptr = put_index_data;
    char this_index[SPRINT_MAX_LEN] = "title1";
    snmp_set_var_value(vptr, (u_char *) &this_index ,
                       sizeof(this_index) );

*my_loop_context = (void *)this_index;
*my_data_context = (void *)this_index;

return put_index_data;

}
/*****************************************************************/
bookTable_get_next_data_point(void **my_loop_context,
                              void **my_data_context,
                              netsnmp_variable_list * put_index_data,
                              netsnmp_iterator_info *mydata)
{
    netsnmp_variable_list *vptr;

    subtree_context_cache *context_ptr;

    if (!my_loop_context || !*my_loop_context){
        return NULL;
     }

    char this_index[SPRINT_MAX_LEN];
    snprintf(this_index,SPRINT_MAX_LEN,(const char*)*my_loop_context);

    if(strcmp(this_index,"title1")==0){
       snprintf(this_index,SPRINT_MAX_LEN,"title2");
    } else if (strcmp(this_index,"title2")==0){
       snprintf(this_index,SPRINT_MAX_LEN,"title3");
    }else{
       return NULL;
    }

snmp_set_var_value(vptr, (u_char *) &this_index ,
sizeof(this_index) );

*my_loop_context = (void *)this_index;
*my_data_context = (void *)this_index;

return put_index_data;
}

/*****************************************************************/

This will compile and run the agent, a walk will result in a core dump in the get_next_data_point method, at the snmp_set_var_value call.

Am I implementing this correctly? This is essentially how I implemented similar methods when the index was an integer.

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How to index a table with a string

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