// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package a

type TypeA string

			ID:       q.ID,
			Response: true,
		},
		Questions: q.Questions,
	}
	if len(q.Questions) == 1 && q.Questions[0].Type == dnsmessage.TypeA {
		r.Answers = []dnsmessage.Resource{
			{
				Header: dnsmessage.ResourceHeader{
					Name:   q.Questions[0].Name,
					Type:   dnsmessage.TypeA,
					Class:  dnsmessage.ClassINET,
					Length: 4,
				},
				Body: &dnsmessage.AResource{
					A: TestAddr,
				},

	} else {
		domain := msg.Question[0].Name
		c, ok := s.hosts[domain]
		if ok {
			s.hosts[domain]++
			switch r.Question[0].Qtype {
			case dns.TypeA:
				msg.Answer = append(msg.Answer, &dns.A{
					Hdr: dns.RR_Header{Name: domain, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: s.ttl},
					A:   net.ParseIP(fmt.Sprintf("10.0.0.%d", c)),
				})
			case dns.TypeAAAA:
				// set a long TTL for AAAA

			host:                    "details.ns2.",
			expectResolutionFailure: dns.RcodeNameError, // on home machines, the ISP may resolve to some generic webpage. So this test may fail on laptops
		},
		{
			name:     "success: TypeA query returns A records only",
			host:     "dual.localhost.",
			expected: a("dual.localhost.", []netip.Addr{netip.MustParseAddr("2.2.2.2")}),
		},
		{
			name:     "success: wild card returns A record correctly",

	HandleAAAA func(w AAAAWriter, name string) error
	HandleSRV  func(w SRVWriter, name string) error
}

type ResponseWriter struct{ a *resolverFuncConn }

func (w ResponseWriter) header() dnsmessage.ResourceHeader {
	q := w.a.q
	return dnsmessage.ResourceHeader{
		Name:  q.Name,
		Type:  q.Type,
		Class: q.Class,
		TTL:   w.a.ttl,
	}
}

// SetTTL sets the TTL for subsequent written resources.

	case '4':
		qtypes = []dnsmessage.Type{dnsmessage.TypeA}
	case '6':
		qtypes = []dnsmessage.Type{dnsmessage.TypeAAAA}
	}
	var queryFn func(fqdn string, qtype dnsmessage.Type)
	var responseFn func(fqdn string, qtype dnsmessage.Type) result
	if conf.singleRequest {
		queryFn = func(fqdn string, qtype dnsmessage.Type) {}
		responseFn = func(fqdn string, qtype dnsmessage.Type) result {
			dnsWaitGroup.Add(1)

	address := make([]dns.RR, 0)
	mx := make([]dns.RR, 0)
	rest := make([]dns.RR, 0)
	for _, r := range in {
		switch r.Header().Rrtype {
		case dns.TypeCNAME:
			cname = append(cname, r)
		case dns.TypeA, dns.TypeAAAA:
			address = append(address, r)
		case dns.TypeMX:
			mx = append(mx, r)
		default:
			rest = append(rest, r)
		}
	}

	roundRobinShuffle(address)
	roundRobinShuffle(mx)

)

// Message formats

// A Type is a type of DNS request and response.
type Type uint16

const (
	// ResourceHeader.Type and Question.Type
	TypeA     Type = 1
	TypeNS    Type = 2
	TypeCNAME Type = 5
	TypeSOA   Type = 6
	TypePTR   Type = 12
	TypeMX    Type = 15
	TypeTXT   Type = 16
	TypeAAAA  Type = 28
	TypeSRV   Type = 33
	TypeOPT   Type = 41

	// Question.Type
	TypeWKS   Type = 11

			return
		}
		for _, rr := range res.Answer {
			switch record := rr.(type) {
			case *dns.A:
				out = append(out, record.A.String())
			case *dns.AAAA:
				out = append(out, record.AAAA.String())
			}
		}
		if nextTTL := minimalTTL(res); nextTTL < ttl {
			ttl = nextTTL
		}
	}

	wg.Add(2)
	go doResolve(dns.TypeA)
	go doResolve(dns.TypeAAAA)
	wg.Wait()

	sort.Strings(out)

// and success cases.
func TestCrossDeviceMountPaths(t *testing.T) {
	successCase := `/dev/0 /path/to/0/1 type0 flags 0 0
		/dev/1    /path/to/1   type1	flags 1 1
		/dev/2 /path/to/1/2 type2 flags,1,2=3 2 2
                /dev/3 /path/to/1.1 type3 flags,1,2=3 3 3
		`
	var err error
	dir := t.TempDir()
	mountsPath := filepath.Join(dir, "mounts")