net-snmp获取各个类型的数据

原文地址http://blog.chinaunix.net/uid-17260303-id-3042593.html

/* manipuate the information ourselves */

        for(vars = response->variables; vars; vars = vars->next_variable) //pdu is a
snmp_pdu style variable

        {

            printf("var type is %d\n", vars->type);

            if (vars->type == ASN_OCTET_STR) //vars is a
variable_list style variable

            {

                //判断是字符串还是Hex-STRING

                int hex = 0;

                int x;

                u_char * cp;

                int allow_realloc = 1;

                u_char *buf = NULL;

                size_t buf_len = 256, out_len = 0;

                for (cp = vars->val.string, x = 0; x < (int) vars->val_len; x++, cp++) 

                {

                    if (!isprint(*cp) && !isspace(*cp)) 

                    {

                        hex = 1;

                    }

                }

                if(!hex) //字符串

                {

                    char *sp = (char *)malloc(1 + vars->val_len);

                    memcpy(sp, vars->val.string, vars->val_len); //netsnmp_vardata is a
netsnmp_vardata style variable

     sp[vars->val_len] = '\0';

                    printf("value #%d is a string: %s\n", count++, sp);

                    free(sp);

                }

                else //Hex-STRING

                {

                    buf = (u_char *) calloc(buf_len, 1);

                    snmp_cstrcat(&buf, &buf_len, &out_len, allow_realloc, "");

                    sprint_realloc_hexstring(&buf, &buf_len, &out_len, allow_realloc,vars->val.string, vars->val_len);

                    printf("value #%d is a hex-string: %s\n", count++, buf);

                    free(buf);

                }

            }

            else if(vars->type == ASN_TIMETICKS)

            {

                long timetick = *vars->val.integer;

                printf("value #%d is a timetick: %d\n", count++, timetick);

            }

            else if(vars->type == ASN_OBJECT_ID)

            {

                 printf("value #%d is a oid: ", count++);

                 for(i=0; i<vars->name_length; i++)

                 {

                     if(*(vars->name_loc+i) == 0)

                         break;

                     printf(".%d", *(vars->name_loc+i));

                 }

                 printf(" and value is ");

                 for(i=0; i<(vars->val_len/sizeof(int)); i++)

                 {

                     printf(".%d", *(vars->val.objid+i));

                 }

                 printf("\n");

                

            }

            else if(vars->type == ASN_INTEGER)

            {

                printf("value #%d is a integer: %d\n", count++, *(vars->val.integer));

            }

            else if(vars->type == ASN_COUNTER)

            {

                printf("value #%d is a count: %u\n", count++, (unsigned int)(*vars->val.integer & 0xffffffff));

            }

            else if(vars->type == ASN_GAUGE)

            {

                printf("value #%d is a gauge: %u\n", count++, *(vars->val.integer));

            }

            else if(vars->type == ASN_IPADDRESS)

            {

                u_char *ip = vars->val.string;

                printf("value #%d is a ipaddress: %d.%d.%d.%d\n", count++, ip[0], ip[1], ip[2], ip[3]);

            }

            else if(vars->type == ASN_NULL)

            {

                printf("value #%d is a null: \n", count++);

            }

            else

              printf("value #%d is NOT a string! Ack!\n", count++);

        }

    }