enum {
DNS_CLASS_IN = 0x01,
DNS_CLASS_ANY = 0xFF,
+ _DNS_CLASS_MAX,
+ _DNS_CLASS_INVALID = -1
};
/* DNS record types, see RFC 1035 */
DNS_TYPE_TSIG = 0xFA,
DNS_TYPE_IXFR = 0xFB,
DNS_TYPE_AXFR = 0xFC,
+ _DNS_TYPE_MAX,
+ _DNS_TYPE_INVALID = -1
};
struct DnsResourceKey {