// newNSEC3CEandWildcard returns the NSEC3 for the closest encloser
// and the NSEC3 that denies that wildcard at that level.
func newNSEC3CEandWildcard(apex, ce string, ttl uint32) (*dns.NSEC3, *dns.NSEC3) {
n1 := new(dns.NSEC3)
n1.Hdr.Class = dns.ClassINET
n1.Hdr.Rrtype = dns.TypeNSEC3
n1.Hdr.Ttl = ttl
n1.Hash = dns.SHA1
n1.HashLength = sha1.Size
n1.Flags = 0
n1.Iterations = 0
n1.Salt = ""
// for the apex we need another bitmap
n1.TypeBitMap = []uint16{dns.TypeA, dns.TypeAAAA, dns.TypeSRV, dns.TypeRRSIG}
prev := dns.HashName(ce, dns.SHA1, n1.Iterations, n1.Salt)
n1.Hdr.Name = strings.ToLower(prev) + "." + apex
buf := packBase32(prev)
byteArith(buf, true) // one next
n1.NextDomain = unpackBase32(buf)
n2 := new(dns.NSEC3)
n2.Hdr.Class = dns.ClassINET
n2.Hdr.Rrtype = dns.TypeNSEC3
n2.Hdr.Ttl = ttl
n2.Hash = dns.SHA1
n2.HashLength = sha1.Size
n2.Flags = 0
n2.Iterations = 0
n2.Salt = ""
prev = dns.HashName("*."+ce, dns.SHA1, n2.Iterations, n2.Salt)
buf = packBase32(prev)
byteArith(buf, false) // one before
n2.Hdr.Name = appendDomain(strings.ToLower(unpackBase32(buf)), apex)
byteArith(buf, true) // one next
byteArith(buf, true) // and another one
n2.NextDomain = unpackBase32(buf)
return n1, n2
}
// newNSEC3NoData returns the NSEC3 record needed to denial the types
func (s *server) newNSEC3NoData(qname string) *dns.NSEC3 {
n := new(dns.NSEC3)
n.Hdr.Class = dns.ClassINET
n.Hdr.Rrtype = dns.TypeNSEC3
n.Hdr.Ttl = s.config.MinTtl
n.Hash = dns.SHA1
n.HashLength = sha1.Size
n.Flags = 0
n.Salt = ""
n.TypeBitMap = []uint16{dns.TypeA, dns.TypeAAAA, dns.TypeSRV, dns.TypeRRSIG}
n.Hdr.Name = dns.HashName(qname, dns.SHA1, 0, "")
buf := packBase32(n.Hdr.Name)
byteArith(buf, true) // one next
n.NextDomain = unpackBase32(buf)
n.Hdr.Name += appendDomain("", s.config.Domain)
return n
}
// newNSEC3NameError returns the NSEC3 record needed to denial qname.
func (s *server) newNSEC3NameError(qname string) *dns.NSEC3 {
n := new(dns.NSEC3)
n.Hdr.Class = dns.ClassINET
n.Hdr.Rrtype = dns.TypeNSEC3
n.Hdr.Ttl = s.config.MinTtl
n.Hash = dns.SHA1
n.HashLength = sha1.Size
n.Flags = 0
n.Salt = ""
n.TypeBitMap = []uint16{}
covername := dns.HashName(qname, dns.SHA1, 0, "")
buf := packBase32(covername)
byteArith(buf, false) // one before
n.Hdr.Name = appendDomain(strings.ToLower(unpackBase32(buf)), s.config.Domain)
byteArith(buf, true) // one next
byteArith(buf, true) // and another one
n.NextDomain = unpackBase32(buf)
return n
}