snmp.xs

开发snmp的开发包有两个开放的SNMP开发库

	case SNMP_NOSUCHOBJECT:
	case SNMP_NOSUCHINSTANCE:
	    return(type);
	    break;
	case ASN_UINTEGER:
            return(TYPE_UINTEGER);
	    break;
	case ASN_COUNTER64:
            return(TYPE_COUNTER64);
	    break;
	default:
            warn("translate_asn_type: unhandled asn type (%d)\n",type);
            return(TYPE_OTHER);
            break;
        }
}

#define USE_BASIC 0
#define USE_ENUMS 1
#define USE_SPRINT_VALUE 2
static int
__snprint_value (buf, buf_len, var, tp, type, flag)
char * buf;
size_t buf_len;
netsnmp_variable_list * var;
struct tree * tp;
int type;
int flag;
{
   int len = 0;
   u_char* ip;
   struct enum_list *ep;


   buf[0] = '\0';
   if (flag == USE_SPRINT_VALUE) {
	snprint_value(buf, buf_len, var->name, var->name_length, var);
	len = strlen(buf);
   } else {
     switch (var->type) {
        case ASN_INTEGER:
           if (flag == USE_ENUMS) {
              for(ep = tp->enums; ep; ep = ep->next) {
                 if (ep->value == *var->val.integer) {
                    strcpy(buf, ep->label);
                    len = strlen(buf);
                    break;
                 }
              }
           }
           if (!len) {
              sprintf(buf,"%ld", *var->val.integer);
              len = strlen(buf);
           }
           break;

        case ASN_GAUGE:
        case ASN_COUNTER:
        case ASN_TIMETICKS:
        case ASN_UINTEGER:
           sprintf(buf,"%lu", (unsigned long) *var->val.integer);
           len = strlen(buf);
           break;

        case ASN_OCTET_STR:
        case ASN_OPAQUE:
           memcpy(buf, (char*)var->val.string, var->val_len);
           len = var->val_len;
           break;

        case ASN_IPADDRESS:
          ip = (u_char*)var->val.string;
          sprintf(buf, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
          len = strlen(buf);
          break;

        case ASN_NULL:
           break;

        case ASN_OBJECT_ID:
          __sprint_num_objid(buf, (oid *)(var->val.objid),
                             var->val_len/sizeof(oid));
          len = strlen(buf);
          break;

	case SNMP_ENDOFMIBVIEW:
          sprintf(buf,"%s", "ENDOFMIBVIEW");
	  break;
	case SNMP_NOSUCHOBJECT:
	  sprintf(buf,"%s", "NOSUCHOBJECT");
	  break;
	case SNMP_NOSUCHINSTANCE:
	  sprintf(buf,"%s", "NOSUCHINSTANCE");
	  break;

        case ASN_COUNTER64:
#ifdef NETSNMP_WITH_OPAQUE_SPECIAL_TYPES
        case ASN_OPAQUE_COUNTER64:
        case ASN_OPAQUE_U64:
#endif
          printU64(buf,(struct counter64 *)var->val.counter64);
          len = strlen(buf);
          break;

#ifdef NETSNMP_WITH_OPAQUE_SPECIAL_TYPES
        case ASN_OPAQUE_I64:
          printI64(buf,(struct counter64 *)var->val.counter64);
          len = strlen(buf);
          break;
#endif

        case ASN_BIT_STR:
            snprint_bitstring(buf, sizeof(buf), var, NULL, NULL, NULL);
            len = strlen(buf);
            break;
#ifdef NETSNMP_WITH_OPAQUE_SPECIAL_TYPES
        case ASN_OPAQUE_FLOAT:
	  if (var->val.floatVal)
	    sprintf(buf,"%f", *var->val.floatVal);
         break;
         
        case ASN_OPAQUE_DOUBLE:
	  if (var->val.doubleVal)
	    sprintf(buf,"%f", *var->val.doubleVal);
         break;
#endif
         
        case ASN_NSAP:
        default:
           warn("snprint_value: asn type not handled %d\n",var->type);
     }
   }
   return(len);
}

static int
__sprint_num_objid (buf, objid, len)
char *buf;
oid *objid;
int len;
{
   int i;
   buf[0] = '\0';
   for (i=0; i < len; i++) {
	sprintf(buf,".%lu",*objid++);
	buf += strlen(buf);
   }
   return SUCCESS;
}

static int
__tp_sprint_num_objid (buf, tp)
char *buf;
SnmpMibNode *tp;
{
   oid newname[MAX_OID_LEN], *op;
   /* code taken from get_node in snmp_client.c */
   for (op = newname + MAX_OID_LEN - 1; op >= newname; op--) {
      *op = tp->subid;
      tp = tp->parent;
      if (tp == NULL) break;
   }
   return __sprint_num_objid(buf, op, newname + MAX_OID_LEN - op);
}

static int
__scan_num_objid (buf, objid, len)
char *buf;
oid *objid;
size_t *len;
{
   char *cp;
   *len = 0;
   if (*buf == '.') buf++;
   cp = buf;
   while (*buf) {
      if (*buf++ == '.') {
         sscanf(cp, "%lu", objid++);
         /* *objid++ = atoi(cp); */
         (*len)++;
         cp = buf;
      } else {
         if (isalpha((int)*buf)) {
	    return FAILURE;
         }
      }
   }
   sscanf(cp, "%lu", objid++);
   /* *objid++ = atoi(cp); */
   (*len)++;
   return SUCCESS;
}

static int
__get_type_str (type, str)
int type;
char * str;
{
   switch (type) {
	case TYPE_OBJID:
       		strcpy(str, "OBJECTID");
	        break;
	case TYPE_OCTETSTR:
       		strcpy(str, "OCTETSTR");
	        break;
	case TYPE_INTEGER:
       		strcpy(str, "INTEGER");
	        break;
	case TYPE_INTEGER32:
       		strcpy(str, "INTEGER32");
	        break;
	case TYPE_UNSIGNED32:
       		strcpy(str, "UNSIGNED32");
	        break;
	case TYPE_NETADDR:
       		strcpy(str, "NETADDR");
	        break;
	case TYPE_IPADDR:
       		strcpy(str, "IPADDR");
	        break;
	case TYPE_COUNTER:
       		strcpy(str, "COUNTER");
	        break;
	case TYPE_GAUGE:
       		strcpy(str, "GAUGE");
	        break;
	case TYPE_TIMETICKS:
       		strcpy(str, "TICKS");
	        break;
	case TYPE_OPAQUE:
       		strcpy(str, "OPAQUE");
	        break;
	case TYPE_COUNTER64:
       		strcpy(str, "COUNTER64");
	        break;
	case TYPE_NULL:
                strcpy(str, "NULL");
                break;
	case SNMP_ENDOFMIBVIEW:
                strcpy(str, "ENDOFMIBVIEW");
                break;
	case SNMP_NOSUCHOBJECT:
                strcpy(str, "NOSUCHOBJECT");
                break;
	case SNMP_NOSUCHINSTANCE:
                strcpy(str, "NOSUCHINSTANCE");
                break;
	case TYPE_UINTEGER:
                strcpy(str, "UINTEGER"); /* historic - should not show up */
                                          /* but it does?                  */
                break;
	case TYPE_NOTIFTYPE:
		strcpy(str, "NOTIF");
		break;
	case TYPE_BITSTRING:
		strcpy(str, "BITS");
		break;
	case TYPE_TRAPTYPE:
		strcpy(str, "TRAP");
		break;
	case TYPE_OTHER: /* not sure if this is a valid leaf type?? */
	case TYPE_NSAPADDRESS:
        default: /* unsupported types for now */
           strcpy(str, "");
           return(FAILURE);
   }
   return SUCCESS;
}

/* does a destructive disection of <label1>...<labeln>.<iid> returning
   <labeln> and <iid> in seperate strings (note: will destructively
   alter input string, 'name') */
static int
__get_label_iid (name, last_label, iid, flag)
char * name;
char ** last_label;
char ** iid;
int flag;
{
   char *lcp;
   char *icp;
   int len = strlen(name);
   int found_label = 0;

   *last_label = *iid = NULL;

   if (len == 0) return(FAILURE);

   /* Handle case where numeric oid's have been requested.  The input 'name'
   ** in this case should be a numeric OID -- return failure if not.
   */
   if ((flag & USE_NUMERIC_OIDS)) {
      if (!__is_numeric_oid(name))
       return(FAILURE);

      /* Walk backward through the string, looking for first two '.' chars */
      lcp = &(name[len]);
      icp = NULL;
      while (lcp > name) {
       if (*lcp == '.') {

          /* If this is the first occurence of '.', note it in icp.
          ** Otherwise, this must be the second occurrence, so break
          ** out of the loop.
          */
          if (icp == NULL)
             icp = lcp;
          else
             break;
       }
       lcp --;
      }

      /* Make sure we found at least a label and index. */
      if (!icp)
         return(FAILURE);

      /* Push forward past leading '.' chars and separate the strings. */
      lcp ++;
      *icp ++ = '\0';

      *last_label = (flag & USE_LONG_NAMES) ? name : lcp;
      *iid        = icp;

      return(SUCCESS);
   }

   lcp = icp = &(name[len]);

   while (lcp > name) {
      if (*lcp == '.') {
	if (found_label) {
	   lcp++;
           break;
        } else {
           icp = lcp;
        }
      }
      if (!found_label && isalpha((int)*lcp)) found_label = 1;
      lcp--;
   }

   if (!found_label || (!isdigit((int)*(icp+1)) && (flag & FAIL_ON_NULL_IID)))
      return(FAILURE);

   if (flag & NON_LEAF_NAME) { /* dont know where to start instance id */
     /* put the whole thing in label */
     icp = &(name[len]);
     flag |= USE_LONG_NAMES;
     /* special hack in case no mib loaded - object identifiers will
      * start with .iso.<num>.<num>...., in which case it is preferable
      * to make the label entirely numeric (i.e., convert "iso" => "1")
      */
      if (*lcp == '.' && lcp == name) {
         if (!strncmp(".ccitt.",lcp,7)) {
            name += 2;
            *name = '.';
            *(name+1) = '0';
         } else if (!strncmp(".iso.",lcp,5)) {
            name += 2;
            *name = '.';
            *(name+1) = '1';
         } else if (!strncmp(".joint-iso-ccitt.",lcp,17)) {
            name += 2;
            *name = '.';
            *(name+1) = '2';
         }
      }
   } else if (*icp) {
      *(icp++) = '\0';
   }
   *last_label = (flag & USE_LONG_NAMES ? name : lcp);

   *iid = icp;

   return(SUCCESS);
}


static int
__oid_cmp(oida_arr, oida_arr_len, oidb_arr, oidb_arr_len)
oid *oida_arr;
size_t oida_arr_len;
oid *oidb_arr;
size_t oidb_arr_len;
{
   for (;oida_arr_len && oidb_arr_len;
	oida_arr++, oida_arr_len--, oidb_arr++, oidb_arr_len--) {
	if (*oida_arr == *oidb_arr) continue;
	return(*oida_arr > *oidb_arr ? 1 : -1);
   }
   if (oida_arr_len == oidb_arr_len) return(0);
   return(oida_arr_len > oidb_arr_len ? 1 : -1);
}

/* Convert a tag (string) to an OID array              */
/* Tag can be either a symbolic name, or an OID string */
static struct tree *
__tag2oid(tag, iid, oid_arr, oid_arr_len, type, best_guess)
char * tag;
char * iid;
oid  * oid_arr;
size_t * oid_arr_len;
int  * type;
int    best_guess;
{
   struct tree *tp = NULL;
   struct tree *rtp = NULL;
   oid newname[MAX_OID_LEN], *op;
   size_t newname_len = 0;

   char str_buf[STR_BUF_SIZE];
   str_buf[0] = '\0';

   if (type) *type = TYPE_UNKNOWN;
   if (oid_arr_len) *oid_arr_len = 0;
   if (!tag) goto done;

   /*********************************************************/
   /* best_guess = 0 - same as no switches (read_objid)     */
   /*                  if multiple parts, or uses find_node */
   /*                  if a single leaf                     */
   /* best_guess = 1 - same as -Ib (get_wild_node)          */
   /* best_guess = 2 - same as -IR (get_node)               */
   /*********************************************************/

   /* numeric scalar                (1,2) */
   /* single symbolic               (1,2) */