snippet to parse the DNS RCODE field

parseRCode.go

const (
	RC_NOERROR   = 0
	RC_FORMERR   = 1
	RC_SERVFAIL  = 2
	RC_NXDOMAIN  = 3
	RC_NOTIMP    = 4
	RC_REFUSED   = 5
	RC_YXDOMAIN  = 6
	RC_YXRRSET   = 7
	RC_NXRRSET   = 8
	RC_NOTAUTH   = 9
	RC_NOTZONE   = 10
	RC_DSOTYPENI = 11
	RC_BADVERS   = 16
	RC_BADKEY    = 17
	RC_BADTIME   = 18
	RC_BADMODE   = 19
	RC_BADNAME   = 20
	RC_BADALG    = 21
	RC_BADTRUNC  = 22
	RC_COOKIE    = 23
)

func parseRCode(rcode int) string {
	switch rcode {
	case RC_NOERROR:
		return "NOERROR"
	case RC_FORMERR:
		return "FORMERR"
	case RC_SERVFAIL:
		return "SERVFAIL"
	case RC_NXDOMAIN:
		return "NXDOMAIN"
	case RC_NOTIMP:
		return "NOTIMP"
	case RC_REFUSED:
		return "REFUSED"
	case RC_YXDOMAIN:
		return "YXDOMAIN"
	case RC_YXRRSET:
		return "YXRRSET"
	case RC_NXRRSET:
		return "NXRRSET"
	case RC_NOTAUTH:
		return "NOTAUTH"
	case RC_NOTZONE:
		return "NOTZONE"
	case RC_DSOTYPENI:
		return "DCSOTYPENI"
	case RC_BADVERS:
		return "BADVERS"
	case RC_BADKEY:
		return "BADKEY"
	case RC_BADTIME:
		return "BADTIME"
	case RC_BADMODE:
		return "BADMODE"
	case RC_BADNAME:
		return "BADNAME"
	case RC_BADALG:
		return "BADALG"
	case RC_BADTRUNC:
		return "BADTRUNC"
	case RC_COOKIE:
		return "COOKIE"
	default:
		return fmt.Sprintf("%d", rcode)
	}
}