Iterate option is unable to retreive the first index column value s.

Hi 

There exists a table with 2 indices. Totally the table posseses 5 columns,
out of which first 2 columns are indexes.

I am using a structure to retrieve these 2 indexes.

The structure is declared as :
/*
 * This structure has a specific purpose.
 * Used only with tables which have 2 indexes.
 */
struct indexData{
    int min1;    // min value for index 1
    int min2;    // min value for index 2
    int max1;   // max value for index 1
    int max2;   // max value for index 2
    int start1;   // start point of min value for index 1
    int start2;   // start point of min value for index 2
    int size;     // overall size of container
};

typedef struct indexData otherData;


The get_first and get_next hooks are like this :

netsnmp_variable_list *
exampleTable_get_first_data_point(void **my_loop_context,
                                         void **my_data_context,
                                         netsnmp_variable_list *
                                         put_index_data,
                                         netsnmp_iterator_info *mydata)
{
    otherData* rest = exampleTable_other;

    printf("Inside Function %s\n", __FUNCTION__);

    if ( rest->start1 <= 0 || rest->start2 <= 0 )
        return NULL;

    rest->min1 = rest->start1;
    rest->min2 = rest->start2;

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

    return exampleTable_get_next_data_point(my_loop_context,
                                                   my_data_context,
                                                   put_index_data, mydata);
}


netsnmp_variable_list *
exampleTable_get_next_data_point(void **my_loop_context,
                                        void **my_data_context,
                                        netsnmp_variable_list *
                                        put_index_data,
                                        netsnmp_iterator_info *mydata)
{
    otherData* rest;
    netsnmp_variable_list *idx = put_index_data;

    printf("Inside Function %s\n", __FUNCTION__);

    rest = ( otherData * ) *my_loop_context ;

    if ( rest->min1 > rest->max1 || rest->min2 > rest->max2 )
        return NULL;

    snmp_set_var_value(idx, (u_char *) &rest->min1,
                                sizeof(rest->min1));
    idx = idx->next_variable;

    snmp_set_var_value(idx,(u_char *) &rest->min2,
                                sizeof(rest->min2));
    idx = idx->next_variable;

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

    rest->min1++;
    rest->min2++;

    return put_index_data;
}

And the handler is :

int
exampleTable_handler(netsnmp_mib_handler *handler,
                            netsnmp_handler_registration *reginfo,
                            netsnmp_agent_request_info *reqinfo,
                            netsnmp_request_info *requests)
{

    netsnmp_request_info *request;
    netsnmp_table_request_info *table_info;
    netsnmp_variable_list * var;
    otherData *rest;

    static oid      exampleTableEntry_oid[] =
        { 1, 3, 6, 1, 4, 1, 1872, 2, 5, 6, 2, 4, 1 };

    unsigned int column_oid_len =
                        OID_LENGTH(exampleTableEntry_oid) + 3;
    oid column_oid[column_oid_len];
    int iteridx1, iteridx2, rc = 0, foundit = 0;
    char *str, *temp;
    unsigned int hashVal = -1, value = 0;
    Data* ip;

    printf("Inside Function %s\n", __FUNCTION__);
    switch (reqinfo->mode) {
        /*
         * Read-support (also covers GetNext requests)
         */
    case MODE_GET:
        for (request = requests; request; request = request->next) {
            var = request->requestvb;
            printf("req oid = ");
            print_oid( var->name, var->name_length );

            rest = (otherData *) netsnmp_extract_iterator_context(request);
            if( rest == NULL )
            {
                printf("table_entry is NULL\n");
                return SNMP_NOSUCHINSTANCE;
            }

            table_info = netsnmp_extract_table_info(request);
            if ( table_info == NULL )
                continue;

            rc = append_to_oid_sec( column_oid,
                                bwmStatPortTcrTableEntry_oid,
                                column_oid_len-3,
                                table_info->colnum,
                                var->name[var->name_length-2],
                                var->name[var->name_length-1]  );
            hashVal = APHash( column_oid, column_oid_len );
            ip = traverse_table_container( bwmStatPortTcrTable_container,
                                           rest->size,
                                           hashVal );
            foundit = HASH_EQUALS( ip->key, hashVal );
            if ( foundit )
            {
                temp = (char*) ip->value;
                printf("temp val = %s\n", temp);
                iteridx1 = *table_info->indexes->val.integer ;
                iteridx2 = *table_info->indexes->next_variable->val.integer
;
                printf("iteridx1, 2 = %d, %d\n", iteridx1, iteridx2);
            }
            else
            {
                printf("Unable to trace the req oid\n");
                return;
            }

            printf("colnum = %d\n", table_info->colnum);
            switch (table_info->colnum) {
            case COLUMN_EXAMPLEPORTINDEX:
                printf("col1->indx\n");
                snmp_set_var_typed_value(request->requestvb, ASN_INTEGER,
                                         (u_char*) &iteridx1,
                                         sizeof(iteridx1));
                break;

            case COLUMN_EXAMPLECONTRACTINDEX:
                printf("col2->indx\n");
                snmp_set_var_typed_value(request->requestvb, ASN_INTEGER,
                                         (u_char*) &iteridx2,
                                         sizeof(iteridx2));
                break;

            case COLUMN_EXAMPLENAME:
                snmp_set_var_typed_value(request->requestvb, ASN_OCTET_STR,
                                         temp, strlen(temp) );
                break;

            case COLUMN_EXAMPLERATE:
                value = atoi(temp);
                snmp_set_var_typed_value(request->requestvb, ASN_INTEGER,
                                         (u_char*) &value,
                                         sizeof(value));
                break;

            case COLUMN_EXAMPLEOUTOCT:
                value = atoi(temp);
                snmp_set_var_typed_value(request->requestvb, ASN_COUNTER,
                                         (u_char*) &value,
                                         sizeof(value));
                break;
            }
        }
        break;
    }
    return SNMP_ERR_NOERROR;
}

Now, when I perform a snmp walk, or snmp get next , or snmp get ,
I can only see the values from column 2. The column is always missing.

The data are all displayed correctly.
I dont understand what's going wrong.

Please help.......

Thanx in advance.

Regards,
Rohini







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