// Copyright 2009 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 dnsmessage
import (
"bytes"
"fmt"
"reflect"
"strings"
"testing"
)
func TestPrintPaddedUint8(t *testing.T) {
tests := []struct {
num uint8
want string
}{
{0, "000"},
{1, "001"},
{9, "009"},
{10, "010"},
{99, "099"},
{100, "100"},
{124, "124"},
{104, "104"},
{120, "120"},
{255, "255"},
}
for _, test := range tests {
if got := printPaddedUint8(test.num); got != test.want {
t.Errorf("got printPaddedUint8(%d) = %s, want = %s", test.num, got, test.want)
}
}
}
func TestPrintUint8Bytes(t *testing.T) {
tests := []uint8{
0,
1,
9,
10,
99,
100,
124,
104,
120,
255,
}
for _, test := range tests {
if got, want := string(printUint8Bytes(nil, test)), fmt.Sprint(test); got != want {
t.Errorf("got printUint8Bytes(%d) = %s, want = %s", test, got, want)
}
}
}
func TestPrintUint16(t *testing.T) {
tests := []uint16{
65535,
0,
1,
10,
100,
1000,
10000,
324,
304,
320,
}
for _, test := range tests {
if got, want := printUint16(test), fmt.Sprint(test); got != want {
t.Errorf("got printUint16(%d) = %s, want = %s", test, got, want)
}
}
}
func TestPrintUint32(t *testing.T) {
tests := []uint32{
4294967295,
65535,
0,
1,
10,
100,
1000,
10000,
100000,
1000000,
10000000,
100000000,
1000000000,
324,
304,
320,
}
for _, test := range tests {
if got, want := printUint32(test), fmt.Sprint(test); got != want {
t.Errorf("got printUint32(%d) = %s, want = %s", test, got, want)
}
}
}
func mustEDNS0ResourceHeader(l int, extrc RCode, do bool) ResourceHeader {
h := ResourceHeader{Class: ClassINET}
if err := h.SetEDNS0(l, extrc, do); err != nil {
panic(err)
}
return h
}
func (m *Message) String() string {
s := fmt.Sprintf("Message: %#v\n", &m.Header)
if len(m.Questions) > 0 {
s += "-- Questions\n"
for _, q := range m.Questions {
s += fmt.Sprintf("%#v\n", q)
}
}
if len(m.Answers) > 0 {
s += "-- Answers\n"
for _, a := range m.Answers {
s += fmt.Sprintf("%#v\n", a)
}
}
if len(m.Authorities) > 0 {
s += "-- Authorities\n"
for _, ns := range m.Authorities {
s += fmt.Sprintf("%#v\n", ns)
}
}
if len(m.Additionals) > 0 {
s += "-- Additionals\n"
for _, e := range m.Additionals {
s += fmt.Sprintf("%#v\n", e)
}
}
return s
}
func TestNameString(t *testing.T) {
want := "foo"
name := MustNewName(want)
if got := fmt.Sprint(name); got != want {
t.Errorf("got fmt.Sprint(%#v) = %s, want = %s", name, got, want)
}
}
func TestQuestionPackUnpack(t *testing.T) {
want := Question{
Name: MustNewName("."),
Type: TypeA,
Class: ClassINET,
}
buf, err := want.pack(make([]byte, 1, 50), map[string]int{}, 1)
if err != nil {
t.Fatal("Question.pack() =", err)
}
var p Parser
p.msg = buf
p.header.questions = 1
p.section = sectionQuestions
p.off = 1
got, err := p.Question()
if err != nil {
t.Fatalf("Parser{%q}.Question() = %v", string(buf[1:]), err)
}
if p.off != len(buf) {
t.Errorf("unpacked different amount than packed: got = %d, want = %d", p.off, len(buf))
}
if !reflect.DeepEqual(got, want) {
t.Errorf("got from Parser.Question() = %+v, want = %+v", got, want)
}
}
func TestName(t *testing.T) {
tests := []string{
"",
".",
"google..com",
"google.com",
"google..com.",
"google.com.",
".google.com.",
"www..google.com.",
"www.google.com.",
}
for _, test := range tests {
n, err := NewName(test)
if err != nil {
t.Errorf("NewName(%q) = %v", test, err)
continue
}
if ns := n.String(); ns != test {
t.Errorf("got %#v.String() = %q, want = %q", n, ns, test)
continue
}
}
}
func TestNamePackUnpack(t *testing.T) {
tests := []struct {
in string
want string
err error
}{
{"", "", errNonCanonicalName},
{".", ".", nil},
{"google..com", "", errNonCanonicalName},
{"google.com", "", errNonCanonicalName},
{"google..com.", "", errZeroSegLen},
{"google.com.", "google.com.", nil},
{".google.com.", "", errZeroSegLen},
{"www..google.com.", "", errZeroSegLen},
{"www.google.com.", "www.google.com.", nil},
}
for _, test := range tests {
in := MustNewName(test.in)
want := MustNewName(test.want)
buf, err := in.pack(make([]byte, 0, 30), map[string]int{}, 0)
if err != test.err {
t.Errorf("got %q.pack() = %v, want = %v", test.in, err, test.err)
continue
}
if test.err != nil {
continue
}
var got Name
n, err := got.unpack(buf, 0)
if err != nil {
t.Errorf("%q.unpack() = %v", test.in, err)
continue
}
if n != len(buf) {
t.Errorf(
"unpacked different amount than packed for %q: got = %d, want = %d",
test.in,
n,
len(buf),
)
}
if got != want {
t.Errorf("unpacking packing of %q: got = %#v, want = %#v", test.in, got, want)
}
}
}
func TestIncompressibleName(t *testing.T) {
name := MustNewName("example.com.")
compression := map[string]int{}
buf, err := name.pack(make([]byte, 0, 100), compression, 0)
if err != nil {
t.Fatal("first Name.pack() =", err)
}
buf, err = name.pack(buf, compression, 0)
if err != nil {
t.Fatal("second Name.pack() =", err)
}
var n1 Name
off, err := n1.unpackCompressed(buf, 0, false /* allowCompression */)
if err != nil {
t.Fatal("unpacking incompressible name without pointers failed:", err)
}
var n2 Name
if _, err := n2.unpackCompressed(buf, off, false /* allowCompression */); err != errCompressedSRV {
t.Errorf("unpacking compressed incompressible name with pointers: got %v, want = %v", err, errCompressedSRV)
}
}
func checkErrorPrefix(err error, prefix string) bool {
e, ok := err.(*nestedError)
return ok && e.s == prefix
}
func TestHeaderUnpackError(t *testing.T) {
wants := []string{
"id",
"bits",
"questions",
"answers",
"authorities",
"additionals",
}
var buf []byte
var h header
for _, want := range wants {
n, err := h.unpack(buf, 0)
if n != 0 || !checkErrorPrefix(err, want) {
t.Errorf("got header.unpack([%d]byte, 0) = %d, %v, want = 0, %s", len(buf), n, err, want)
}
buf = append(buf, 0, 0)
}
}
func TestParserStart(t *testing.T) {
const want = "unpacking header"
var p Parser
for i := 0; i <= 1; i++ {
_, err := p.Start([]byte{})
if !checkErrorPrefix(err, want) {
t.Errorf("got Parser.Start(nil) = _, %v, want = _, %s", err, want)
}
}
}
func TestResourceNotStarted(t *testing.T) {
tests := []struct {
name string
fn func(*Parser) error
}{
{"CNAMEResource", func(p *Parser) error { _, err := p.CNAMEResource(); return err }},
{"MXResource", func(p *Parser) error { _, err := p.MXResource(); return err }},
{"NSResource", func(p *Parser) error { _, err := p.NSResource(); return err }},
{"PTRResource", func(p *Parser) error { _, err := p.PTRResource(); return err }},
{"SOAResource", func(p *Parser) error { _, err := p.SOAResource(); return err }},
{"TXTResource", func(p *Parser) error { _, err := p.TXTResource(); return err }},
{"SRVResource", func(p *Parser) error { _, err := p.SRVResource(); return err }},
{"AResource", func(p *Parser) error { _, err := p.AResource(); return err }},
{"AAAAResource", func(p *Parser) error { _, err := p.AAAAResource(); return err }},
}
for _, test := range tests {
if err := test.fn(&Parser{}); err != ErrNotStarted {
t.Errorf("got Parser.%s() = _ , %v, want = _, %v", test.name, err, ErrNotStarted)
}
}
}
func TestDNSPackUnpack(t *testing.T) {
wants := []Message{
{
Questions: []Question{
{
Name: MustNewName("."),
Type: TypeAAAA,
Class: ClassINET,
},
},
Answers: []Resource{},
Authorities: []Resource{},
Additionals: []Resource{},
},
largeTestMsg(),
}
for i, want := range wants {
b, err := want.Pack()
if err != nil {
t.Fatalf("%d: Message.Pack() = %v", i, err)
}
var got Message
err = got.Unpack(b)
if err != nil {
t.Fatalf("%d: Message.Unapck() = %v", i, err)
}
if !reflect.DeepEqual(got, want) {
t.Errorf("%d: Message.Pack/Unpack() roundtrip: got = %+v, want = %+v", i, &got, &want)
}
}
}
func TestDNSAppendPackUnpack(t *testing.T) {
wants := []Message{
{
Questions: []Question{
{
Name: MustNewName("."),
Type: TypeAAAA,
Class: ClassINET,
},
},
Answers: []Resource{},
Authorities: []Resource{},
Additionals: []Resource{},
},
largeTestMsg(),
}
for i, want := range wants {
b := make([]byte, 2, 514)
b, err := want.AppendPack(b)
if err != nil {
t.Fatalf("%d: Message.AppendPack() = %v", i, err)
}
b = b[2:]
var got Message
err = got.Unpack(b)
if err != nil {
t.Fatalf("%d: Message.Unapck() = %v", i, err)
}
if !reflect.DeepEqual(got, want) {
t.Errorf("%d: Message.AppendPack/Unpack() roundtrip: got = %+v, want = %+v", i, &got, &want)
}
}
}
func TestSkipAll(t *testing.T) {
msg := largeTestMsg()
buf, err := msg.Pack()
if err != nil {
t.Fatal("Message.Pack() =", err)
}
var p Parser
if _, err := p.Start(buf); err != nil {
t.Fatal("Parser.Start(non-nil) =", err)
}
tests := []struct {
name string
f func() error
}{
{"SkipAllQuestions", p.SkipAllQuestions},
{"SkipAllAnswers", p.SkipAllAnswers},
{"SkipAllAuthorities", p.SkipAllAuthorities},
{"SkipAllAdditionals", p.SkipAllAdditionals},
}
for _, test := range tests {
for i := 1; i <= 3; i++ {
if err := test.f(); err != nil {
t.Errorf("%d: Parser.%s() = %v", i, test.name, err)
}
}
}
}
func TestSkipEach(t *testing.T) {
msg := smallTestMsg()
buf, err := msg.Pack()
if err != nil {
t.Fatal("Message.Pack() =", err)
}
var p Parser
if _, err := p.Start(buf); err != nil {
t.Fatal("Parser.Start(non-nil) =", err)
}
tests := []struct {
name string
f func() error
}{
{"SkipQuestion", p.SkipQuestion},
{"SkipAnswer", p.SkipAnswer},
{"SkipAuthority", p.SkipAuthority},
{"SkipAdditional", p.SkipAdditional},
}
for _, test := range tests {
if err := test.f(); err != nil {
t.Errorf("first Parser.%s() = %v, want = nil", test.name, err)
}
if err := test.f(); err != ErrSectionDone {
t.Errorf("second Parser.%s() = %v, want = %v", test.name, err, ErrSectionDone)
}
}
}
func TestSkipAfterRead(t *testing.T) {
msg := smallTestMsg()
buf, err := msg.Pack()
if err != nil {
t.Fatal("Message.Pack() =", err)
}
var p Parser
if _, err := p.Start(buf); err != nil {
t.Fatal("Parser.Srart(non-nil) =", err)
}
tests := []struct {
name string
skip func() error
read func() error
}{
{"Question", p.SkipQuestion, func() error { _, err := p.Question(); return err }},
{"Answer", p.SkipAnswer, func() error { _, err := p.Answer(); return err }},
{"Authority", p.SkipAuthority, func() error { _, err := p.Authority(); return err }},
{"Additional", p.SkipAdditional, func() error { _, err := p.Additional(); return err }},
}
for _, test := range tests {
if err := test.read(); err != nil {
t.Errorf("got Parser.%s() = _, %v, want = _, nil", test.name, err)
}
if err := test.skip(); err != ErrSectionDone {
t.Errorf("got Parser.Skip%s() = %v, want = %v", test.name, err, ErrSectionDone)
}
}
}
func TestSkipNotStarted(t *testing.T) {
var p Parser
tests := []struct {
name string
f func() error
}{
{"SkipAllQuestions", p.SkipAllQuestions},
{"SkipAllAnswers", p.SkipAllAnswers},
{"SkipAllAuthorities", p.SkipAllAuthorities},
{"SkipAllAdditionals", p.SkipAllAdditionals},
}
for _, test := range tests {
if err := test.f(); err != ErrNotStarted {
t.Errorf("got Parser.%s() = %v, want = %v", test.name, err, ErrNotStarted)
}
}
}
func TestTooManyRecords(t *testing.T) {
const recs = int(^uint16(0)) + 1
tests := []struct {
name string
msg Message
want error
}{
{
"Questions",
Message{
Questions: make([]Question, recs),
},
errTooManyQuestions,
},
{
"Answers",
Message{
Answers: make([]Resource, recs),
},
errTooManyAnswers,
},
{
"Authorities",
Message{
Authorities: make([]Resource, recs),
},
errTooManyAuthorities,
},
{
"Additionals",
Message{
Additionals: make([]Resource, recs),
},
errTooManyAdditionals,
},
}
for _, test := range tests {
if _, got := test.msg.Pack(); got != test.want {
t.Errorf("got Message.Pack() for %d %s = %v, want = %v", recs, test.name, got, test.want)
}
}
}
func TestVeryLongTxt(t *testing.T) {
want := Resource{
ResourceHeader{
Name: MustNewName("foo.bar.example.com."),
Type: TypeTXT,
Class: ClassINET,
},
&TXTResource{[]string{
"",
"",
"foo bar",
"",
"www.example.com",
"www.example.com.",
strings.Repeat(".", 255),
}},
}
buf, err := want.pack(make([]byte, 0, 8000), map[string]int{}, 0)
if err != nil {
t.Fatal("Resource.pack() =", err)
}
var got Resource
off, err := got.Header.unpack(buf, 0)
if err != nil {
t.Fatal("ResourceHeader.unpack() =", err)
}
body, n, err := unpackResourceBody(buf, off, got.Header)
if err != nil {
t.Fatal("unpackResourceBody() =", err)
}
got.Body = body
if n != len(buf) {
t.Errorf("unpacked different amount than packed: got = %d, want = %d", n, len(buf))
}
if !reflect.DeepEqual(got, want) {
t.Errorf("Resource.pack/unpack() roundtrip: got = %#v, want = %#v", got, want)
}
}
func TestTooLongTxt(t *testing.T) {
rb := TXTResource{[]string{strings.Repeat(".", 256)}}
if _, err := rb.pack(make([]byte, 0, 8000), map[string]int{}, 0); err != errStringTooLong {
t.Errorf("packing TXTResource with 256 character string: got err = %v, want = %v", err, errStringTooLong)
}
}
func TestStartAppends(t *testing.T) {
buf := make([]byte, 2, 514)
wantBuf := []byte{4, 44}
copy(buf, wantBuf)
b := NewBuilder(buf, Header{})
b.EnableCompression()
buf, err := b.Finish()
if err != nil {
t.Fatal("Builder.Finish() =", err)
}
if got, want := len(buf), headerLen+2; got != want {
t.Errorf("got len(buf) = %d, want = %d", got, want)
}
if string(buf[:2]) != string(wantBuf) {
t.Errorf("original data not preserved, got = %#v, want = %#v", buf[:2], wantBuf)
}
}
func TestStartError(t *testing.T) {
tests := []struct {
name string
fn func(*Builder) error
}{
{"Questions", func(b *Builder) error { return b.StartQuestions() }},
{"Answers", func(b *Builder) error { return b.StartAnswers() }},
{"Authorities", func(b *Builder) error { return b.StartAuthorities() }},
{"Additionals", func(b *Builder) error { return b.StartAdditionals() }},
}
envs := []struct {
name string
fn func() *Builder
want error
}{
{"sectionNotStarted", func() *Builder { return &Builder{section: sectionNotStarted} }, ErrNotStarted},
{"sectionDone", func() *Builder { return &Builder{section: sectionDone} }, ErrSectionDone},
}
for _, env := range envs {
for _, test := range tests {
if got := test.fn(env.fn()); got != env.want {
t.Errorf("got Builder{%s}.Start%s() = %v, want = %v", env.name, test.name, got, env.want)
}
}
}
}
func TestBuilderResourceError(t *testing.T) {
tests := []struct {
name string
fn func(*Builder) error
}{
{"CNAMEResource", func(b *Builder) error { return b.CNAMEResource(ResourceHeader{}, CNAMEResource{}) }},
{"MXResource", func(b *Builder) error { return b.MXResource(ResourceHeader{}, MXResource{}) }},
{"NSResource", func(b *Builder) error { return b.NSResource(ResourceHeader{}, NSResource{}) }},
{"PTRResource", func(b *Builder) error { return b.PTRResource(ResourceHeader{}, PTRResource{}) }},
{"SOAResource", func(b *Builder) error { return b.SOAResource(ResourceHeader{}, SOAResource{}) }},
{"TXTResource", func(b *Builder) error { return b.TXTResource(ResourceHeader{}, TXTResource{}) }},
{"SRVResource", func(b *Builder) error { return b.SRVResource(ResourceHeader{}, SRVResource{}) }},
{"AResource", func(b *Builder) error { return b.AResource(ResourceHeader{}, AResource{}) }},
{"AAAAResource", func(b *Builder) error { return b.AAAAResource(ResourceHeader{}, AAAAResource{}) }},
{"OPTResource", func(b *Builder) error { return b.OPTResource(ResourceHeader{}, OPTResource{}) }},
}
envs := []struct {
name string
fn func() *Builder
want error
}{
{"sectionNotStarted", func() *Builder { return &Builder{section: sectionNotStarted} }, ErrNotStarted},
{"sectionHeader", func() *Builder { return &Builder{section: sectionHeader} }, ErrNotStarted},
{"sectionQuestions", func() *Builder { return &Builder{section: sectionQuestions} }, ErrNotStarted},
{"sectionDone", func() *Builder { return &Builder{section: sectionDone} }, ErrSectionDone},
}
for _, env := range envs {
for _, test := range tests {
if got := test.fn(env.fn()); got != env.want {
t.Errorf("got Builder{%s}.%s() = %v, want = %v", env.name, test.name, got, env.want)
}
}
}
}
func TestFinishError(t *testing.T) {
var b Builder
want := ErrNotStarted
if _, got := b.Finish(); got != want {
t.Errorf("got Builder.Finish() = %v, want = %v", got, want)
}
}
func TestBuilder(t *testing.T) {
msg := largeTestMsg()
want, err := msg.Pack()
if err != nil {
t.Fatal("Message.Pack() =", err)
}
b := NewBuilder(nil, msg.Header)
b.EnableCompression()
if err := b.StartQuestions(); err != nil {
t.Fatal("Builder.StartQuestions() =", err)
}
for _, q := range msg.Questions {
if err := b.Question(q); err != nil {
t.Fatalf("Builder.Question(%#v) = %v", q, err)
}
}
if err := b.StartAnswers(); err != nil {
t.Fatal("Builder.StartAnswers() =", err)
}
for _, a := range msg.Answers {
switch a.Header.Type {
case TypeA:
if err := b.AResource(a.Header, *a.Body.(*AResource)); err != nil {
t.Fatalf("Builder.AResource(%#v) = %v", a, err)
}
case TypeNS:
if err := b.NSResource(a.Header, *a.Body.(*NSResource)); err != nil {
t.Fatalf("Builder.NSResource(%#v) = %v", a, err)
}
case TypeCNAME:
if err := b.CNAMEResource(a.Header, *a.Body.(*CNAMEResource)); err != nil {
t.Fatalf("Builder.CNAMEResource(%#v) = %v", a, err)
}
case TypeSOA:
if err := b.SOAResource(a.Header, *a.Body.(*SOAResource)); err != nil {
t.Fatalf("Builder.SOAResource(%#v) = %v", a, err)
}
case TypePTR:
if err := b.PTRResource(a.Header, *a.Body.(*PTRResource)); err != nil {
t.Fatalf("Builder.PTRResource(%#v) = %v", a, err)
}
case TypeMX:
if err := b.MXResource(a.Header, *a.Body.(*MXResource)); err != nil {
t.Fatalf("Builder.MXResource(%#v) = %v", a, err)
}
case TypeTXT:
if err := b.TXTResource(a.Header, *a.Body.(*TXTResource)); err != nil {
t.Fatalf("Builder.TXTResource(%#v) = %v", a, err)
}
case TypeAAAA:
if err := b.AAAAResource(a.Header, *a.Body.(*AAAAResource)); err != nil {
t.Fatalf("Builder.AAAAResource(%#v) = %v", a, err)
}
case TypeSRV:
if err := b.SRVResource(a.Header, *a.Body.(*SRVResource)); err != nil {
t.Fatalf("Builder.SRVResource(%#v) = %v", a, err)
}
}
}
if err := b.StartAuthorities(); err != nil {
t.Fatal("Builder.StartAuthorities() =", err)
}
for _, a := range msg.Authorities {
if err := b.NSResource(a.Header, *a.Body.(*NSResource)); err != nil {
t.Fatalf("Builder.NSResource(%#v) = %v", a, err)
}
}
if err := b.StartAdditionals(); err != nil {
t.Fatal("Builder.StartAdditionals() =", err)
}
for _, a := range msg.Additionals {
switch a.Body.(type) {
case *TXTResource:
if err := b.TXTResource(a.Header, *a.Body.(*TXTResource)); err != nil {
t.Fatalf("Builder.TXTResource(%#v) = %v", a, err)
}
case *OPTResource:
if err := b.OPTResource(a.Header, *a.Body.(*OPTResource)); err != nil {
t.Fatalf("Builder.OPTResource(%#v) = %v", a, err)
}
}
}
got, err := b.Finish()
if err != nil {
t.Fatal("Builder.Finish() =", err)
}
if !bytes.Equal(got, want) {
t.Fatalf("got from Builder.Finish() = %#v\nwant = %#v", got, want)
}
}
func TestResourcePack(t *testing.T) {
for _, tt := range []struct {
m Message
err error
}{
{
Message{
Questions: []Question{
{
Name: MustNewName("."),
Type: TypeAAAA,
Class: ClassINET,
},
},
Answers: []Resource{{ResourceHeader{}, nil}},
},
&nestedError{"packing Answer", errNilResouceBody},
},
{
Message{
Questions: []Question{
{
Name: MustNewName("."),
Type: TypeAAAA,
Class: ClassINET,
},
},
Authorities: []Resource{{ResourceHeader{}, (*NSResource)(nil)}},
},
&nestedError{"packing Authority",
&nestedError{"ResourceHeader",
&nestedError{"Name", errNonCanonicalName},
},
},
},
{
Message{
Questions: []Question{
{
Name: MustNewName("."),
Type: TypeA,
Class: ClassINET,
},
},
Additionals: []Resource{{ResourceHeader{}, nil}},
},
&nestedError{"packing Additional", errNilResouceBody},
},
} {
_, err := tt.m.Pack()
if !reflect.DeepEqual(err, tt.err) {
t.Errorf("got Message{%v}.Pack() = %v, want %v", tt.m, err, tt.err)
}
}
}
func TestResourcePackLength(t *testing.T) {
r := Resource{
ResourceHeader{
Name: MustNewName("."),
Type: TypeA,
Class: ClassINET,
},
&AResource{[4]byte{127, 0, 0, 2}},
}
hb, _, err := r.Header.pack(nil, nil, 0)
if err != nil {
t.Fatal("ResourceHeader.pack() =", err)
}
buf := make([]byte, 0, len(hb))
buf, err = r.pack(buf, nil, 0)
if err != nil {
t.Fatal("Resource.pack() =", err)
}
var hdr ResourceHeader
if _, err := hdr.unpack(buf, 0); err != nil {
t.Fatal("ResourceHeader.unpack() =", err)
}
if got, want := int(hdr.Length), len(buf)-len(hb); got != want {
t.Errorf("got hdr.Length = %d, want = %d", got, want)
}
}
func TestOptionPackUnpack(t *testing.T) {
for _, tt := range []struct {
name string
w []byte // wire format of m.Additionals
m Message
dnssecOK bool
extRCode RCode
}{
{
name: "without EDNS(0) options",
w: []byte{
0x00, 0x00, 0x29, 0x10, 0x00, 0xfe, 0x00, 0x80,
0x00, 0x00, 0x00,
},
m: Message{
Header: Header{RCode: RCodeFormatError},
Questions: []Question{
{
Name: MustNewName("."),
Type: TypeA,
Class: ClassINET,
},
},
Additionals: []Resource{
{
mustEDNS0ResourceHeader(4096, 0xfe0|RCodeFormatError, true),
&OPTResource{},
},
},
},
dnssecOK: true,
extRCode: 0xfe0 | RCodeFormatError,
},
{
name: "with EDNS(0) options",
w: []byte{
0x00, 0x00, 0x29, 0x10, 0x00, 0xff, 0x00, 0x00,
0x00, 0x00, 0x0c, 0x00, 0x0c, 0x00, 0x02, 0x00,
0x00, 0x00, 0x0b, 0x00, 0x02, 0x12, 0x34,
},
m: Message{
Header: Header{RCode: RCodeServerFailure},
Questions: []Question{
{
Name: MustNewName("."),
Type: TypeAAAA,
Class: ClassINET,
},
},
Additionals: []Resource{
{
mustEDNS0ResourceHeader(4096, 0xff0|RCodeServerFailure, false),
&OPTResource{
Options: []Option{
{
Code: 12, // see RFC 7828
Data: []byte{0x00, 0x00},
},
{
Code: 11, // see RFC 7830
Data: []byte{0x12, 0x34},
},
},
},
},
},
},
dnssecOK: false,
extRCode: 0xff0 | RCodeServerFailure,
},
{
// Containing multiple OPT resources in a
// message is invalid, but it's necessary for
// protocol conformance testing.
name: "with multiple OPT resources",
w: []byte{
0x00, 0x00, 0x29, 0x10, 0x00, 0xff, 0x00, 0x00,
0x00, 0x00, 0x06, 0x00, 0x0b, 0x00, 0x02, 0x12,
0x34, 0x00, 0x00, 0x29, 0x10, 0x00, 0xff, 0x00,
0x00, 0x00, 0x00, 0x06, 0x00, 0x0c, 0x00, 0x02,
0x00, 0x00,
},
m: Message{
Header: Header{RCode: RCodeNameError},
Questions: []Question{
{
Name: MustNewName("."),
Type: TypeAAAA,
Class: ClassINET,
},
},
Additionals: []Resource{
{
mustEDNS0ResourceHeader(4096, 0xff0|RCodeNameError, false),
&OPTResource{
Options: []Option{
{
Code: 11, // see RFC 7830
Data: []byte{0x12, 0x34},
},
},
},
},
{
mustEDNS0ResourceHeader(4096, 0xff0|RCodeNameError, false),
&OPTResource{
Options: []Option{
{
Code: 12, // see RFC 7828
Data: []byte{0x00, 0x00},
},
},
},
},
},
},
},
} {
w, err := tt.m.Pack()
if err != nil {
t.Errorf("Message.Pack() for %s = %v", tt.name, err)
continue
}
if !bytes.Equal(w[len(w)-len(tt.w):], tt.w) {
t.Errorf("got Message.Pack() for %s = %#v, want %#v", tt.name, w[len(w)-len(tt.w):], tt.w)
continue
}
var m Message
if err := m.Unpack(w); err != nil {
t.Errorf("Message.Unpack() for %s = %v", tt.name, err)
continue
}
if !reflect.DeepEqual(m.Additionals, tt.m.Additionals) {
t.Errorf("got Message.Pack/Unpack() roundtrip for %s = %+v, want %+v", tt.name, m, tt.m)
continue
}
}
}
// TestGoString tests that Message.GoString produces Go code that compiles to
// reproduce the Message.
//
// This test was produced as follows:
// 1. Run (*Message).GoString on largeTestMsg().
// 2. Remove "dnsmessage." from the output.
// 3. Paste the result in the test to store it in msg.
// 4. Also put the original output in the test to store in want.
func TestGoString(t *testing.T) {
msg := Message{Header: Header{ID: 0, Response: true, OpCode: 0, Authoritative: true, Truncated: false, RecursionDesired: false, RecursionAvailable: false, RCode: RCodeSuccess}, Questions: []Question{{Name: MustNewName("foo.bar.example.com."), Type: TypeA, Class: ClassINET}}, Answers: []Resource{{Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeA, Class: ClassINET, TTL: 0, Length: 0}, Body: &AResource{A: [4]byte{127, 0, 0, 1}}}, {Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeA, Class: ClassINET, TTL: 0, Length: 0}, Body: &AResource{A: [4]byte{127, 0, 0, 2}}}, {Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeAAAA, Class: ClassINET, TTL: 0, Length: 0}, Body: &AAAAResource{AAAA: [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}}}, {Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeCNAME, Class: ClassINET, TTL: 0, Length: 0}, Body: &CNAMEResource{CNAME: MustNewName("alias.example.com.")}}, {Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeSOA, Class: ClassINET, TTL: 0, Length: 0}, Body: &SOAResource{NS: MustNewName("ns1.example.com."), MBox: MustNewName("mb.example.com."), Serial: 1, Refresh: 2, Retry: 3, Expire: 4, MinTTL: 5}}, {Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypePTR, Class: ClassINET, TTL: 0, Length: 0}, Body: &PTRResource{PTR: MustNewName("ptr.example.com.")}}, {Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeMX, Class: ClassINET, TTL: 0, Length: 0}, Body: &MXResource{Pref: 7, MX: MustNewName("mx.example.com.")}}, {Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeSRV, Class: ClassINET, TTL: 0, Length: 0}, Body: &SRVResource{Priority: 8, Weight: 9, Port: 11, Target: MustNewName("srv.example.com.")}}}, Authorities: []Resource{{Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeNS, Class: ClassINET, TTL: 0, Length: 0}, Body: &NSResource{NS: MustNewName("ns1.example.com.")}}, {Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeNS, Class: ClassINET, TTL: 0, Length: 0}, Body: &NSResource{NS: MustNewName("ns2.example.com.")}}}, Additionals: []Resource{{Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeTXT, Class: ClassINET, TTL: 0, Length: 0}, Body: &TXTResource{TXT: []string{"So Long\x2c and Thanks for All the Fish"}}}, {Header: ResourceHeader{Name: MustNewName("foo.bar.example.com."), Type: TypeTXT, Class: ClassINET, TTL: 0, Length: 0}, Body: &TXTResource{TXT: []string{"Hamster Huey and the Gooey Kablooie"}}}, {Header: ResourceHeader{Name: MustNewName("."), Type: TypeOPT, Class: 4096, TTL: 4261412864, Length: 0}, Body: &OPTResource{Options: []Option{{Code: 10, Data: []byte{1, 35, 69, 103, 137, 171, 205, 239}}}}}}}
if !reflect.DeepEqual(msg, largeTestMsg()) {
t.Error("Message.GoString lost information or largeTestMsg changed: msg != largeTestMsg()")
}
got := msg.GoString()
want := `dnsmessage.Message{Header: dnsmessage.Header{ID: 0, Response: true, OpCode: 0, Authoritative: true, Truncated: false, RecursionDesired: false, RecursionAvailable: false, RCode: dnsmessage.RCodeSuccess}, Questions: []dnsmessage.Question{dnsmessage.Question{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeA, Class: dnsmessage.ClassINET}}, Answers: []dnsmessage.Resource{dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeA, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.AResource{A: [4]byte{127, 0, 0, 1}}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeA, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.AResource{A: [4]byte{127, 0, 0, 2}}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeAAAA, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.AAAAResource{AAAA: [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeCNAME, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.CNAMEResource{CNAME: dnsmessage.MustNewName("alias.example.com.")}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeSOA, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.SOAResource{NS: dnsmessage.MustNewName("ns1.example.com."), MBox: dnsmessage.MustNewName("mb.example.com."), Serial: 1, Refresh: 2, Retry: 3, Expire: 4, MinTTL: 5}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypePTR, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.PTRResource{PTR: dnsmessage.MustNewName("ptr.example.com.")}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeMX, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.MXResource{Pref: 7, MX: dnsmessage.MustNewName("mx.example.com.")}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeSRV, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.SRVResource{Priority: 8, Weight: 9, Port: 11, Target: dnsmessage.MustNewName("srv.example.com.")}}}, Authorities: []dnsmessage.Resource{dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeNS, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.NSResource{NS: dnsmessage.MustNewName("ns1.example.com.")}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeNS, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.NSResource{NS: dnsmessage.MustNewName("ns2.example.com.")}}}, Additionals: []dnsmessage.Resource{dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeTXT, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.TXTResource{TXT: []string{"So Long\x2c and Thanks for All the Fish"}}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("foo.bar.example.com."), Type: dnsmessage.TypeTXT, Class: dnsmessage.ClassINET, TTL: 0, Length: 0}, Body: &dnsmessage.TXTResource{TXT: []string{"Hamster Huey and the Gooey Kablooie"}}}, dnsmessage.Resource{Header: dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName("."), Type: dnsmessage.TypeOPT, Class: 4096, TTL: 4261412864, Length: 0}, Body: &dnsmessage.OPTResource{Options: []dnsmessage.Option{dnsmessage.Option{Code: 10, Data: []byte{1, 35, 69, 103, 137, 171, 205, 239}}}}}}}`
if got != want {
t.Errorf("got msg1.GoString() = %s\nwant = %s", got, want)
}
}
func benchmarkParsingSetup() ([]byte, error) {
name := MustNewName("foo.bar.example.com.")
msg := Message{
Header: Header{Response: true, Authoritative: true},
Questions: []Question{
{
Name: name,
Type: TypeA,
Class: ClassINET,
},
},
Answers: []Resource{
{
ResourceHeader{
Name: name,
Class: ClassINET,
},
&AResource{[4]byte{}},
},
{
ResourceHeader{
Name: name,
Class: ClassINET,
},
&AAAAResource{[16]byte{}},
},
{
ResourceHeader{
Name: name,
Class: ClassINET,
},
&CNAMEResource{name},
},
{
ResourceHeader{
Name: name,
Class: ClassINET,
},
&NSResource{name},
},
},
}
buf, err := msg.Pack()
if err != nil {
return nil, fmt.Errorf("Message.Pack() = %v", err)
}
return buf, nil
}
func benchmarkParsing(tb testing.TB, buf []byte) {
var p Parser
if _, err := p.Start(buf); err != nil {
tb.Fatal("Parser.Start(non-nil) =", err)
}
for {
_, err := p.Question()
if err == ErrSectionDone {
break
}
if err != nil {
tb.Fatal("Parser.Question() =", err)
}
}
for {
h, err := p.AnswerHeader()
if err == ErrSectionDone {
break
}
if err != nil {
tb.Fatal("Parser.AnswerHeader() =", err)
}
switch h.Type {
case TypeA:
if _, err := p.AResource(); err != nil {
tb.Fatal("Parser.AResource() =", err)
}
case TypeAAAA:
if _, err := p.AAAAResource(); err != nil {
tb.Fatal("Parser.AAAAResource() =", err)
}
case TypeCNAME:
if _, err := p.CNAMEResource(); err != nil {
tb.Fatal("Parser.CNAMEResource() =", err)
}
case TypeNS:
if _, err := p.NSResource(); err != nil {
tb.Fatal("Parser.NSResource() =", err)
}
case TypeOPT:
if _, err := p.OPTResource(); err != nil {
tb.Fatal("Parser.OPTResource() =", err)
}
default:
tb.Fatalf("got unknown type: %T", h)
}
}
}
func BenchmarkParsing(b *testing.B) {
buf, err := benchmarkParsingSetup()
if err != nil {
b.Fatal(err)
}
b.ReportAllocs()
for i := 0; i < b.N; i++ {
benchmarkParsing(b, buf)
}
}
func TestParsingAllocs(t *testing.T) {
buf, err := benchmarkParsingSetup()
if err != nil {
t.Fatal(err)
}
if allocs := testing.AllocsPerRun(100, func() { benchmarkParsing(t, buf) }); allocs > 0.5 {
t.Errorf("allocations during parsing: got = %f, want ~0", allocs)
}
}
func benchmarkBuildingSetup() (Name, []byte) {
name := MustNewName("foo.bar.example.com.")
buf := make([]byte, 0, packStartingCap)
return name, buf
}
func benchmarkBuilding(tb testing.TB, name Name, buf []byte) {
bld := NewBuilder(buf, Header{Response: true, Authoritative: true})
if err := bld.StartQuestions(); err != nil {
tb.Fatal("Builder.StartQuestions() =", err)
}
q := Question{
Name: name,
Type: TypeA,
Class: ClassINET,
}
if err := bld.Question(q); err != nil {
tb.Fatalf("Builder.Question(%+v) = %v", q, err)
}
hdr := ResourceHeader{
Name: name,
Class: ClassINET,
}
if err := bld.StartAnswers(); err != nil {
tb.Fatal("Builder.StartQuestions() =", err)
}
ar := AResource{[4]byte{}}
if err := bld.AResource(hdr, ar); err != nil {
tb.Fatalf("Builder.AResource(%+v, %+v) = %v", hdr, ar, err)
}
aaar := AAAAResource{[16]byte{}}
if err := bld.AAAAResource(hdr, aaar); err != nil {
tb.Fatalf("Builder.AAAAResource(%+v, %+v) = %v", hdr, aaar, err)
}
cnr := CNAMEResource{name}
if err := bld.CNAMEResource(hdr, cnr); err != nil {
tb.Fatalf("Builder.CNAMEResource(%+v, %+v) = %v", hdr, cnr, err)
}
nsr := NSResource{name}
if err := bld.NSResource(hdr, nsr); err != nil {
tb.Fatalf("Builder.NSResource(%+v, %+v) = %v", hdr, nsr, err)
}
extrc := 0xfe0 | RCodeNotImplemented
if err := (&hdr).SetEDNS0(4096, extrc, true); err != nil {
tb.Fatalf("ResourceHeader.SetEDNS0(4096, %#x, true) = %v", extrc, err)
}
optr := OPTResource{}
if err := bld.OPTResource(hdr, optr); err != nil {
tb.Fatalf("Builder.OPTResource(%+v, %+v) = %v", hdr, optr, err)
}
if _, err := bld.Finish(); err != nil {
tb.Fatal("Builder.Finish() =", err)
}
}
func BenchmarkBuilding(b *testing.B) {
name, buf := benchmarkBuildingSetup()
b.ReportAllocs()
for i := 0; i < b.N; i++ {
benchmarkBuilding(b, name, buf)
}
}
func TestBuildingAllocs(t *testing.T) {
name, buf := benchmarkBuildingSetup()
if allocs := testing.AllocsPerRun(100, func() { benchmarkBuilding(t, name, buf) }); allocs > 0.5 {
t.Errorf("allocations during building: got = %f, want ~0", allocs)
}
}
func smallTestMsg() Message {
name := MustNewName("example.com.")
return Message{
Header: Header{Response: true, Authoritative: true},
Questions: []Question{
{
Name: name,
Type: TypeA,
Class: ClassINET,
},
},
Answers: []Resource{
{
ResourceHeader{
Name: name,
Type: TypeA,
Class: ClassINET,
},
&AResource{[4]byte{127, 0, 0, 1}},
},
},
Authorities: []Resource{
{
ResourceHeader{
Name: name,
Type: TypeA,
Class: ClassINET,
},
&AResource{[4]byte{127, 0, 0, 1}},
},
},
Additionals: []Resource{
{
ResourceHeader{
Name: name,
Type: TypeA,
Class: ClassINET,
},
&AResource{[4]byte{127, 0, 0, 1}},
},
},
}
}
func BenchmarkPack(b *testing.B) {
msg := largeTestMsg()
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := msg.Pack(); err != nil {
b.Fatal("Message.Pack() =", err)
}
}
}
func BenchmarkAppendPack(b *testing.B) {
msg := largeTestMsg()
buf := make([]byte, 0, packStartingCap)
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := msg.AppendPack(buf[:0]); err != nil {
b.Fatal("Message.AppendPack() = ", err)
}
}
}
func largeTestMsg() Message {
name := MustNewName("foo.bar.example.com.")
return Message{
Header: Header{Response: true, Authoritative: true},
Questions: []Question{
{
Name: name,
Type: TypeA,
Class: ClassINET,
},
},
Answers: []Resource{
{
ResourceHeader{
Name: name,
Type: TypeA,
Class: ClassINET,
},
&AResource{[4]byte{127, 0, 0, 1}},
},
{
ResourceHeader{
Name: name,
Type: TypeA,
Class: ClassINET,
},
&AResource{[4]byte{127, 0, 0, 2}},
},
{
ResourceHeader{
Name: name,
Type: TypeAAAA,
Class: ClassINET,
},
&AAAAResource{[16]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}},
},
{
ResourceHeader{
Name: name,
Type: TypeCNAME,
Class: ClassINET,
},
&CNAMEResource{MustNewName("alias.example.com.")},
},
{
ResourceHeader{
Name: name,
Type: TypeSOA,
Class: ClassINET,
},
&SOAResource{
NS: MustNewName("ns1.example.com."),
MBox: MustNewName("mb.example.com."),
Serial: 1,
Refresh: 2,
Retry: 3,
Expire: 4,
MinTTL: 5,
},
},
{
ResourceHeader{
Name: name,
Type: TypePTR,
Class: ClassINET,
},
&PTRResource{MustNewName("ptr.example.com.")},
},
{
ResourceHeader{
Name: name,
Type: TypeMX,
Class: ClassINET,
},
&MXResource{
7,
MustNewName("mx.example.com."),
},
},
{
ResourceHeader{
Name: name,
Type: TypeSRV,
Class: ClassINET,
},
&SRVResource{
8,
9,
11,
MustNewName("srv.example.com."),
},
},
},
Authorities: []Resource{
{
ResourceHeader{
Name: name,
Type: TypeNS,
Class: ClassINET,
},
&NSResource{MustNewName("ns1.example.com.")},
},
{
ResourceHeader{
Name: name,
Type: TypeNS,
Class: ClassINET,
},
&NSResource{MustNewName("ns2.example.com.")},
},
},
Additionals: []Resource{
{
ResourceHeader{
Name: name,
Type: TypeTXT,
Class: ClassINET,
},
&TXTResource{[]string{"So Long, and Thanks for All the Fish"}},
},
{
ResourceHeader{
Name: name,
Type: TypeTXT,
Class: ClassINET,
},
&TXTResource{[]string{"Hamster Huey and the Gooey Kablooie"}},
},
{
mustEDNS0ResourceHeader(4096, 0xfe0|RCodeSuccess, false),
&OPTResource{
Options: []Option{
{
Code: 10, // see RFC 7873
Data: []byte{0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef},
},
},
},
},
},
}
}
