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builder_test.go
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builder_test.go
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package dnsmsg
import (
"bytes"
"encoding/binary"
"fmt"
"math"
"net/netip"
"reflect"
"testing"
)
func BenchmarkBuilderAppendNameSameName(b *testing.B) {
buf := make([]byte, headerLen, 512)
b.ResetTimer()
for i := 0; i < b.N; i++ {
buf := buf
b := nameBuilderState{}
rawName := MustParseName("www.example.com")
for i := 0; i < 31; i++ {
buf, _ = b.appendName(buf, math.MaxInt, 0, rawName.asSlice(), true)
}
}
}
func BenchmarkBuilderAppendNameAllPointsToFirstName(b *testing.B) {
buf := make([]byte, headerLen, 512)
b.ResetTimer()
for i := 0; i < b.N; i++ {
buf := buf
b := nameBuilderState{}
raw1 := MustParseName("www.example.com")
raw2 := MustParseName("example.com")
raw3 := MustParseName("com")
buf, _ = b.appendName(buf, math.MaxInt, 0, raw1.asSlice(), true)
for i := 0; i < 10; i++ {
buf, _ = b.appendName(buf, math.MaxInt, 0, raw1.asSlice(), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, raw2.asSlice(), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, raw3.asSlice(), true)
}
}
}
func BenchmarkBuilderAppendNameAllDifferentNamesCompressable(b *testing.B) {
buf := make([]byte, headerLen, 512)
b.ResetTimer()
nb := nameBuilderState{}
for i := 0; i < b.N; i++ {
names := []Name{
MustParseName("com"),
MustParseName("example.com"),
MustParseName("www.example.com"),
MustParseName("dfd.www.example.com"),
MustParseName("aa.dfd.www.example.com"),
MustParseName("zz.aa.dfd.www.example.com"),
MustParseName("cc.zz.aa.dfd.www.example.com"),
MustParseName("aa.cc.zz.aa.dfd.www.example.com"),
}
buf := buf
nb.reset()
buf, _ = nb.appendName(buf, math.MaxInt, 0, names[0].asSlice(), true)
buf, _ = nb.appendName(buf, math.MaxInt, 0, names[1].asSlice(), true)
buf, _ = nb.appendName(buf, math.MaxInt, 0, names[2].asSlice(), true)
buf, _ = nb.appendName(buf, math.MaxInt, 0, names[3].asSlice(), true)
buf, _ = nb.appendName(buf, math.MaxInt, 0, names[4].asSlice(), true)
buf, _ = nb.appendName(buf, math.MaxInt, 0, names[5].asSlice(), true)
buf, _ = nb.appendName(buf, math.MaxInt, 0, names[6].asSlice(), true)
buf, _ = nb.appendName(buf, math.MaxInt, 0, names[7].asSlice(), true)
}
}
func BenchmarkBuilderAppendNameAllDifferentNamesCompressable16Names(b *testing.B) {
names := make([]string, 16)
for i := range names {
if i == 0 {
names[i] = "com"
continue
}
names[i] = "aaaa" + "." + names[i-1]
}
buf := make([]byte, headerLen, 512)
builder := nameBuilderState{}
b.ResetTimer()
for i := 0; i < b.N; i++ {
builder.reset()
buf := buf
for _, v := range names {
n := MustParseName(v)
buf, _ = builder.appendName(buf, math.MaxInt, 0, n.asSlice(), true)
}
}
}
func nameAsSlice(s string) []byte {
n := MustParseName(s)
return n.asSlice()
}
func TestAppendName(t *testing.T) {
cases := []struct {
name string
build func() []byte
expect []byte
}{
{
name: "one name",
build: func() []byte {
b := nameBuilderState{}
buf, _ := b.appendName(make([]byte, headerLen), math.MaxInt, 0, nameAsSlice("example.com."), true)
return buf
},
expect: append(
make([]byte, headerLen),
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
),
},
{
name: "four same names",
build: func() []byte {
b := nameBuilderState{}
buf, _ := b.appendName(make([]byte, headerLen), math.MaxInt, 0, nameAsSlice("example.com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("example.com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("example.com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("example.com."), true)
return buf
},
expect: append(
make([]byte, headerLen),
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
0xC0, 12,
0xC0, 12,
0xC0, 12,
),
},
{
name: "three compressable names",
build: func() []byte {
b := nameBuilderState{}
buf, _ := b.appendName(make([]byte, headerLen), math.MaxInt, 0, nameAsSlice("com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("example.com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("www.example.com."), true)
return buf
},
expect: append(
make([]byte, headerLen),
3, 'c', 'o', 'm', 0,
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 0xC0, 12,
3, 'w', 'w', 'w', 0xC0, 17,
),
},
{
name: "first root name followed by three compressable names",
build: func() []byte {
b := nameBuilderState{}
buf, _ := b.appendName(make([]byte, headerLen), math.MaxInt, 0, nameAsSlice("."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("example.com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("www.example.com."), true)
return buf
},
expect: append(
make([]byte, headerLen),
0,
3, 'c', 'o', 'm', 0,
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 0xC0, 13,
3, 'w', 'w', 'w', 0xC0, 18,
),
},
{
name: "compress=false",
build: func() []byte {
b := nameBuilderState{}
buf, _ := b.appendName(make([]byte, headerLen), math.MaxInt, 0, nameAsSlice("com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("example.com."), false)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("www.example.com."), true)
return buf
},
expect: append(
make([]byte, headerLen),
3, 'c', 'o', 'm', 0,
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
3, 'w', 'w', 'w', 0xC0, 17,
),
},
{
name: "maxBufSize on first name",
build: func() []byte {
b := nameBuilderState{}
buf, err := b.appendName(make([]byte, headerLen), 30, 0, nameAsSlice("example.com."), true)
if err != nil {
// TODO: don't panic here.
panic(err)
}
buf, err = b.appendName(buf, 30, 0, nameAsSlice("example.com."), true)
if err != nil {
panic(err)
}
buf, err = b.appendName(buf, 30, 0, nameAsSlice("example.com."), true)
if err != nil {
panic(err)
}
buf, err = b.appendName(buf, 30, 0, nameAsSlice("example.com."), true)
if err != ErrTruncated {
panic(err)
}
return buf
},
expect: append(
make([]byte, headerLen),
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
0xC0, 12,
0xC0, 12,
),
},
{
name: "maxBufSize",
build: func() []byte {
b := nameBuilderState{}
buf, err := b.appendName(make([]byte, headerLen), 30, 0, nameAsSlice("example.com."), true)
if err != nil {
// TODO: don't panic here.
panic(err)
}
buf, err = b.appendName(buf, 30, 0, nameAsSlice("example.com."), true)
if err != nil {
panic(err)
}
buf, err = b.appendName(buf, 30, 0, nameAsSlice("www.example.com."), true)
if err != ErrTruncated {
panic(err)
}
buf, err = b.appendName(buf, 128, 0, nameAsSlice("www.example.com."), true)
if err != nil {
panic(err)
}
return buf
},
expect: append(
make([]byte, headerLen),
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
0xC0, 12,
3, 'w', 'w', 'w', 0xC0, 12,
),
},
{
name: "maxBufSize entire not compressed second name",
build: func() []byte {
b := nameBuilderState{}
buf, err := b.appendName(make([]byte, headerLen), 30, 0, nameAsSlice("example.com."), true)
if err != nil {
// TODO: don't panic here.
panic(err)
}
n := nameAsSlice("example.net.")
buf, err = b.appendName(buf, len(buf)+len(n)-1, 0, n, true)
if err != ErrTruncated {
panic(err)
}
buf, err = b.appendName(buf, 128, 0, nameAsSlice("www.example.net"), true)
if err != nil {
panic(err)
}
buf, err = b.appendName(buf, 128, 0, n, true)
if err != nil {
panic(err)
}
return buf
},
expect: append(
make([]byte, headerLen),
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
3, 'w', 'w', 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'n', 'e', 't', 0,
0xC0, 29,
),
},
{
name: "first name, removeNamesFromCompressionMap",
build: func() []byte {
b := nameBuilderState{}
buf, _ := b.appendName(make([]byte, headerLen), math.MaxInt, 0, nameAsSlice("com."), true)
b.removeNamesFromCompressionMap(0, headerLen)
buf, _ = b.appendName(buf[:headerLen], math.MaxInt, 0, nameAsSlice("com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("example.com."), false)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("www.example.com."), true)
return buf
},
expect: append(
make([]byte, headerLen),
3, 'c', 'o', 'm', 0,
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
3, 'w', 'w', 'w', 0xC0, 17,
),
},
{
name: "multiple names, removeNamesFromCompressionMap, with fake name",
build: func() []byte {
b := nameBuilderState{}
buf, _ := b.appendName(make([]byte, headerLen), math.MaxInt, 0, nameAsSlice("smtp.example.net."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("www.example.com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("www.example.com."), true)
b.removeNamesFromCompressionMap(0, headerLen)
buf, _ = b.appendName(buf[:headerLen], math.MaxInt, 0, nameAsSlice("smtp.example.net."), true)
buf = append(buf, 3, 'w', 'w', 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("www.example.com."), true)
return buf
},
expect: append(
make([]byte, headerLen),
4, 's', 'm', 't', 'p', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'n', 'e', 't', 0,
3, 'w', 'w', 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
3, 'w', 'w', 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
),
},
{
name: "after first name, removeNamesFromCompressionMap",
build: func() []byte {
b := nameBuilderState{}
buf, _ := b.appendName(make([]byte, headerLen), math.MaxInt, 0, nameAsSlice("com."), true)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("example.com."), false)
offset := len(buf)
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("www.example.com."), true)
b.removeNamesFromCompressionMap(0, offset)
buf = buf[:offset]
buf, _ = b.appendName(buf, math.MaxInt, 0, nameAsSlice("www.example.com."), true)
return buf
},
expect: append(
make([]byte, headerLen),
3, 'c', 'o', 'm', 0,
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
3, 'w', 'w', 'w', 0xC0, 17,
),
},
{
name: "removeNamesFromCompressionMap with headerStartOffset",
build: func() []byte {
b := nameBuilderState{}
headerStartOffset := 4
buf := make([]byte, headerStartOffset+headerLen)
buf, _ = b.appendName(buf, math.MaxInt, headerStartOffset, nameAsSlice("com."), true)
buf, _ = b.appendName(buf, math.MaxInt, headerStartOffset, nameAsSlice("example.com."), false)
offset := len(buf)
buf, _ = b.appendName(buf, math.MaxInt, headerStartOffset, nameAsSlice("w.example.com."), true)
b.removeNamesFromCompressionMap(headerStartOffset, offset)
buf = buf[:offset]
buf = append(buf, 1, 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0)
buf, _ = b.appendName(buf, math.MaxInt, headerStartOffset, nameAsSlice("w.example.com."), true)
return buf
},
expect: append(
make([]byte, 4+headerLen),
3, 'c', 'o', 'm', 0,
7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
1, 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0,
1, 'w', 0xC0, 17,
),
},
}
for _, tt := range cases {
buf := tt.build()
if !bytes.Equal(buf, tt.expect) {
t.Fatalf("%v:\nexpected: %v\ngot: %v", tt.name, tt.expect, buf)
}
}
}
func testAppendCompressed(buf []byte, headerStartOffset, maxBufSize int, compression map[string]uint16, name []byte, compress bool) ([]byte, error) {
if len(buf) < headerLen {
panic("invalid use of testAppendCompressed")
}
compressFirstName := true
// The nameBuilderState has an optimization (only for the first name),
// that as a side effect allows compressing not only on label length boundry.
defer func(bufStartLength int) {
if compressFirstName && bufStartLength-headerStartOffset == headerLen {
for i := 0; i < len(name)-1; i++ {
compression[string(name[i:])] = uint16(bufStartLength + i - headerStartOffset)
}
}
}(len(buf))
for i := 0; name[i] != 0; i += int(name[i]) + 1 {
ptr, ok := compression[string(name[i:])]
if compress && ok {
if len(buf)+i+2 > maxBufSize {
for j := 0; j < i; j += int(name[j]) + 1 {
delete(compression, string(name[j:]))
}
compressFirstName = false
return buf, ErrTruncated
}
buf = append(buf, name[:i]...)
return appendUint16(buf, ptr|0xC000), nil
}
if !ok && (len(buf)+i-headerStartOffset) <= maxPtr {
compression[string(name[i:])] = uint16(len(buf) + i - headerStartOffset)
}
}
if len(buf)+len(name) > maxBufSize {
for i := 0; name[i] != 0; i += int(name[i]) + 1 {
delete(compression, string(name[i:]))
}
compressFirstName = false
return buf, ErrTruncated
}
return append(buf, name...), nil
}
func testRemoveLastlyCompressedName(msg []byte, compression map[string]uint16, headerStartOffset int, nameOffset int, name []byte) {
nameOffset -= headerStartOffset
if nameOffset == headerLen {
for i := 0; i < len(name)-1; i++ {
ptr, ok := compression[string(name[i:])]
if ok && int(ptr) >= nameOffset {
delete(compression, string(name[i:]))
}
}
if len(compression) != 0 {
panic("len(compression) != 0")
}
} else {
for i := 0; name[i] != 0; i += int(name[i]) + 1 {
ptr, ok := compression[string(name[i:])]
if ok && int(ptr) >= nameOffset {
delete(compression, string(name[i:]))
}
}
}
}
func FuzzAppendName(f *testing.F) {
f.Fuzz(func(t *testing.T, rand []byte) {
type testName struct {
name string
incMaxBufLen uint16
removeLastNamesCount uint16
compress bool
}
r := fuzzRand{t, rand}
var names []testName
for r.bool() {
names = append(names, testName{
name: string(r.arbitraryAmountOfBytes()),
incMaxBufLen: r.uint16(),
removeLastNamesCount: r.uint16(),
compress: r.bool(),
})
}
headerStartOffset := int(r.uint16())
for _, name := range names {
nn, err := ParseName(name.name)
if err != nil {
return
}
n := nn.asSlice()
if debugFuzz {
encoding := ""
for i := 0; i < len(n); i += int(n[i]) + 1 {
if i != 0 {
encoding += "\n"
}
encoding += fmt.Sprintf("%v %v", n[i], n[i+1:i+1+int(n[i])])
}
t.Logf(
"\nname %#v:\nincMaxBufLen: %v\nremoveLastNamesCount: %v\ncompress: %v\nencoding:\n%v",
name.name, name.incMaxBufLen, name.removeLastNamesCount, name.compress, encoding,
)
}
}
if debugFuzz {
t.Logf("headerStartOffset: %v", headerStartOffset)
}
var (
expect = make([]byte, headerStartOffset+headerLen, headerStartOffset+1024)
maxBufSize = len(expect)
compression = make(map[string]uint16)
)
var nameOffsets []int
var appendedNames []string
if debugFuzz {
t.Logf("appending name to expect slice, len(expect) = %v", len(expect))
}
for i, name := range names {
maxBufSize += int(name.incMaxBufLen)
if debugFuzz {
t.Logf("%v: name: %#v", i, name.name)
t.Logf("%v: len(expect) = %v, maxBufSize: %v", i, len(expect), maxBufSize)
}
var err error
offset := len(expect)
expect, err = testAppendCompressed(expect, headerStartOffset, maxBufSize, compression, nameAsSlice(name.name), name.compress)
if debugFuzz {
t.Logf("%v: offset: %v, buf[headerStartOffset:]: %v, err: %v", i, offset, expect[headerStartOffset:], err)
}
if err != nil && len(expect) != offset {
t.Fatal("buf size changed")
}
for _, ptr := range compression {
if int(ptr) >= len(expect)-headerStartOffset {
t.Fatalf("stale entry found in compression map with ptr: %v", ptr)
}
}
if len(expect) > maxBufSize {
t.Fatalf("len(expect) = %v, len(expect) > maxBufSize", len(expect))
}
if err == nil {
nameOffsets = append(nameOffsets, offset)
appendedNames = append(appendedNames, name.name)
}
removeLastNamesCount := int(name.removeLastNamesCount)
if removeLastNamesCount > len(nameOffsets) {
removeLastNamesCount = len(nameOffsets)
}
if debugFuzz {
t.Logf("%v: removeLastNamesCount: %v", i, removeLastNamesCount)
}
removeOffsets := nameOffsets[len(nameOffsets)-removeLastNamesCount:]
removeNames := appendedNames[len(appendedNames)-removeLastNamesCount:]
nameOffsets = nameOffsets[:len(nameOffsets)-removeLastNamesCount]
appendedNames = appendedNames[:len(appendedNames)-removeLastNamesCount]
for j := len(removeOffsets) - 1; j >= 0; j-- {
offset := removeOffsets[j]
name := removeNames[j]
if debugFuzz {
t.Logf("%v: removing last name: %#v at offset: %v", i, name, offset)
}
testRemoveLastlyCompressedName(expect, compression, headerStartOffset, offset, nameAsSlice(name))
expect = expect[:offset]
if debugFuzz && j != 0 {
t.Logf("%v: buf[headerStartOffset:]: %v", i, expect[headerStartOffset:])
}
for _, ptr := range compression {
if int(ptr) >= len(expect) {
t.Fatalf("stale entry found in compression map with ptr: %v", ptr)
}
}
}
if debugFuzz {
t.Logf("%v: buf[headerStartOffset:]: %v", i, expect[headerStartOffset:])
t.Log()
}
}
p, _, _ := Parse(expect[headerStartOffset:])
for p.curOffset != len(p.msg) {
expectName := appendedNames[0]
appendedNames = appendedNames[1:]
expectedNameOffset := nameOffsets[0] - headerStartOffset
nameOffsets = nameOffsets[1:]
var name Name
offset, err := name.unpack(p.msg, p.curOffset)
if err != nil {
t.Fatalf("failed to unpack name at offset: %v: %v", p.curOffset, err)
}
expect := MustParseName(expectName)
if !bytes.Equal(name.asSlice(), expect.asSlice()) {
t.Fatalf("name at offset: %v, is not euqal to: %#v", p.curOffset, expectName)
}
if expectedNameOffset != p.curOffset {
t.Fatalf("name at offset: %v, was expected to be at: %v offset", p.curOffset, expectedNameOffset)
}
p.curOffset += int(offset)
}
got := make([]byte, headerStartOffset+headerLen, headerStartOffset+1024)
b := nameBuilderState{}
nameOffsets = nil
appendedNames = nil
maxBufSize = len(got)
if debugFuzz {
t.Logf("appending name to got slice, len(got) = %v", len(got))
}
for i, name := range names {
maxBufSize += int(name.incMaxBufLen)
if debugFuzz {
t.Logf("%v: name: %#v", i, name.name)
t.Logf("%v: len(got) = %v, maxBufSize: %v", i, len(got), maxBufSize)
}
var err error
offset := len(got)
got, err = b.appendName(got, maxBufSize, headerStartOffset, nameAsSlice(name.name), name.compress)
if debugFuzz {
t.Logf("%v: offset: %v, buf[headerStartOffset:]: %v, err: %v", i, offset, got[headerStartOffset:], err)
}
if err != nil && len(got) != offset {
t.Fatal("buf size changed")
}
if err == nil {
nameOffsets = append(nameOffsets, offset)
appendedNames = append(appendedNames, name.name)
}
removeLastNamesCount := int(name.removeLastNamesCount)
if removeLastNamesCount > len(nameOffsets) {
removeLastNamesCount = len(nameOffsets)
}
if debugFuzz {
t.Logf("%v: removeLastNamesCount: %v", i, removeLastNamesCount)
}
if len(nameOffsets) > 0 && removeLastNamesCount > 0 {
removeOffset := nameOffsets[len(nameOffsets)-removeLastNamesCount]
removeNames := appendedNames[len(appendedNames)-removeLastNamesCount:]
nameOffsets = nameOffsets[:len(nameOffsets)-removeLastNamesCount]
appendedNames = appendedNames[:len(appendedNames)-removeLastNamesCount]
if debugFuzz {
t.Logf("removing names: %#v at starting offset: %v", removeNames, removeOffset)
}
b.removeNamesFromCompressionMap(headerStartOffset, removeOffset)
got = got[:removeOffset]
}
if debugFuzz {
t.Logf("%v: buf[headerStartOffset:]: %v", i, got[headerStartOffset:])
t.Log()
}
}
if !bytes.Equal(got, expect) {
t.Fatalf(
"failed while appending names: %#v\n\tgot[headerStartOffset:]: %v\n\texpected[headerStartOffset:]: %v",
names, got[headerStartOffset:], expect[headerStartOffset:],
)
}
})
}
func TestBuilder(t *testing.T) {
id := uint16(34581)
var f Flags
f.SetRCode(RCodeSuccess)
f.SetOpCode(OpCodeQuery)
f.SetBit(BitRD, true)
f.SetBit(BitRA, true)
f.SetBit(BitAD, true)
f.SetResponse()
expectHeader := Header{
ID: id,
Flags: f,
}
startLength := 128
b := StartBuilder(make([]byte, startLength, 1024), id, f)
testAfterAppend := func(name string) {
switch name {
case "Questions":
expectHeader.QDCount++
case "Answers":
expectHeader.ANCount++
case "Authorities":
expectHeader.NSCount++
case "Additionals":
expectHeader.ARCount++
default:
panic("unknown section: " + name)
}
if hdr := b.Header(); hdr != expectHeader {
t.Fatalf("%v section, unexpected header: %#v, want: %#v", name, hdr, expectHeader)
}
length := b.Length()
msg := b.Bytes()
if len(msg)-startLength != length {
t.Fatalf("%v section, b.Length() = %v, want: %v", name, length, len(msg)-startLength)
}
_, hdr, err := Parse(msg[startLength:])
if err != nil {
t.Fatalf("%v, section, Parse(msg) returned error: %v", name, err)
}
if hdr != expectHeader {
t.Fatalf("%v section, Parse(msg) unexpected header: %#v, want: %#v", name, hdr, expectHeader)
}
expectHeader.ID += uint16(b.Length())
b.SetID(expectHeader.ID)
expectHeader.Flags += Flags(len(msg))
b.SetFlags(expectHeader.Flags)
}
err := b.Question(Question{
Name: MustParseName("example.com"),
Type: TypeA,
Class: ClassIN,
})
if err != nil {
t.Fatalf("b.Question() unexpected error: %v", err)
}
testAfterAppend("Questions")
rhdr := ResourceHeader{
Name: MustParseName("example.com"),
Class: ClassIN,
TTL: 3600,
}
var (
resourceA = ResourceA{A: [4]byte{192, 0, 2, 1}}
resourceAAAA = ResourceAAAA{AAAA: netip.MustParseAddr("2001:db8::1").As16()}
resourceNS = ResourceNS{NS: MustParseName("ns1.example.com")}
resourceSOA = ResourceSOA{
NS: MustParseName("ns1.example.com"),
Mbox: MustParseName("admin.example.com"),
Serial: 2022010199,
Refresh: 3948793,
Retry: 34383744,
Expire: 1223999999,
Minimum: 123456789,
}
resourcePTR = ResourcePTR{PTR: MustParseName("1.2.0.192.in-addr.arpa")}
resourceTXT = ResourceTXT{
TXT: [][]byte{
bytes.Repeat([]byte("a"), 209),
bytes.Repeat([]byte("b"), 105),
bytes.Repeat([]byte("z"), 123),
},
}
rawResourceTXT = RawResourceTXT{
TXT: func() []byte {
var raw []byte
for _, str := range resourceTXT.TXT {
raw = append(raw, uint8(len(str)))
raw = append(raw, str...)
}
return raw
}(),
}
resourceCNAME = ResourceCNAME{CNAME: MustParseName("www.example.com")}
resourceMX = ResourceMX{Pref: 54831, MX: MustParseName("smtp.example.com")}
resourceOPT = ResourceOPT{Options: []EDNS0Option{
&EDNS0ClientSubnet{Family: AddressFamilyIPv4, SourcePrefixLength: 2, ScopePrefixLength: 3, Address: []byte{192, 0, 2, 1}},
&EDNS0Cookie{
ClientCookie: [8]byte{21, 200, 93, 34, 5, 219, 17, 28},
ServerCookie: [32]byte{1, 2, 3, 4, 5, 6, 7, 99, 234, 139, 99, 119},
ServerCookieAdditionalLength: 12,
},
&EDNS0ExtendedDNSError{InfoCode: 1, ExtraText: []byte("some error Text")},
}}
)
sectionNames := []string{"Answers", "Authorities", "Additionals"}
for i, nextSection := range []func(){b.StartAnswers, b.StartAuthorities, b.StartAdditionals} {
sectionName := sectionNames[i]
nextSection()
rhdr.TTL = 32383739
if err := b.ResourceA(rhdr, resourceA); err != nil {
t.Fatalf("%v section, b.ResourceA() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
rhdr.TTL = 3600
if err := b.ResourceAAAA(rhdr, resourceAAAA); err != nil {
t.Fatalf("%v section, b.ResourceAAAA() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
if err := b.ResourceNS(rhdr, resourceNS); err != nil {
t.Fatalf("%v section, b.ResourceNS() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
if err := b.ResourceSOA(rhdr, resourceSOA); err != nil {
t.Fatalf("%v section, b.ResourceSOA() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
if err := b.ResourcePTR(rhdr, resourcePTR); err != nil {
t.Fatalf("%v section, b.ResourcePTR() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
if err := b.ResourceTXT(rhdr, resourceTXT); err != nil {
t.Fatalf("%v section, b.ResourceTXT() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
if err := b.RawResourceTXT(rhdr, rawResourceTXT); err != nil {
t.Fatalf("%v section, b.RawResourceTXT() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
if err := b.ResourceCNAME(rhdr, resourceCNAME); err != nil {
t.Fatalf("%v section, b.ResourceCNAME() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
if err := b.ResourceMX(rhdr, resourceMX); err != nil {
t.Fatalf("%v section, b.ResourceMX() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
if err := b.ResourceOPT(rhdr, resourceOPT); err != nil {
t.Fatalf("%v section, b.ResourceMX() unexpected error: %v", sectionName, err)
}
testAfterAppend(sectionName)
}
msg := b.Bytes()
if !bytes.Equal(msg[:startLength], make([]byte, startLength)) {
t.Fatal("builder modified msg[:startLength]")
}
p, hdr, err := Parse(msg[startLength:])
if err != nil {
t.Fatalf("Parse(): unexpected error: %v", err)
}
if hdr != expectHeader {
t.Fatalf("Parse() unexpected header: %#v, want: %#v", hdr, expectHeader)
}
q, err := p.Question()
if err != nil {
t.Fatalf("p.Question() unexpected error: %v", err)
}
n := MustParseName("example.com.")
if !q.Name.Equal(&n) {
t.Errorf(`q.Name = %v, q.Name.Equal("example.com") = false, want: true`, q.Name.String())
}
if q.Type != TypeA {
t.Errorf(`q.Type = %v, want: %v`, q.Type, TypeA)
}
if q.Class != ClassIN {
t.Errorf(`q.Class = %v, want: %v`, q.Class, ClassIN)
}
parseResourceHeader := func(curSection string, qType Type, class Class, ttl uint32) {
rhdr, err := p.ResourceHeader()
if err != nil {
t.Fatalf("p.ResourceHeader() unexpected error: %v", err)
}
if !rhdr.Name.Equal(&q.Name) {
t.Errorf("rhdr.Name = %v, rhdr.Name.Equal(&q.Name) = false, want: true", rhdr.Name.String())
}
n := MustParseName("example.com.")
if !rhdr.Name.Equal(&n) {
t.Errorf(`rhdr.Name = %v, rhdr.Name.Equal(MustNewName("example.com")) = false, want: true`, rhdr.Name.String())
}
if rhdr.Type != qType {
t.Errorf(`rhdr.Type = %v, want: %v`, rhdr.Type, qType)
}
if rhdr.Class != class {
t.Errorf(`rhdr.Class = %v, want: %v`, rhdr.Class, class)
}
if rhdr.TTL != ttl {
t.Errorf(`rhdr.TTL = %v, want: %v`, rhdr.TTL, ttl)
}
}
sectionNames = []string{"Questions", "Answers", "Authorities", "Additionals"}
for i, nextSection := range []func() error{p.StartAnswers, p.StartAuthorities, p.StartAdditionals} {
curSectionName := sectionNames[i+1]
if err := nextSection(); err != nil {
t.Fatalf("%v section, p.Start%v(): unexpected error: %v", sectionNames[i], curSectionName, err)
}
parseResourceHeader(curSectionName, TypeA, ClassIN, 32383739)
resA, err := p.ResourceA()
if err != nil {
t.Fatalf("%v section, p.ResourceA(): unexpected error: %v", curSectionName, err)
}
equalRData(t, "p.ResourceA()", resourceA, resA)
parseResourceHeader(curSectionName, TypeAAAA, ClassIN, 3600)
resAAAA, err := p.ResourceAAAA()
if err != nil {
t.Fatalf("%v section, p.ResourceAAAA(): unexpected error: %v", curSectionName, err)
}
equalRData(t, "p.ResourceAAAA()", resourceAAAA, resAAAA)
parseResourceHeader(curSectionName, TypeNS, ClassIN, 3600)
resNS, err := p.ResourceNS()
if err != nil {
t.Fatalf("%v section, p.ResourceNS(): unexpected error: %v", curSectionName, err)
}
equalRData(t, "p.ResourceNS()", resourceNS, resNS)
parseResourceHeader(curSectionName, TypeSOA, ClassIN, 3600)
resSOA, err := p.ResourceSOA()
if err != nil {
t.Fatalf("%v section, p.ResourceSOA(): unexpected error: %v", curSectionName, err)
}
equalRData(t, "p.ResourceSOA()", resourceSOA, resSOA)
parseResourceHeader(curSectionName, TypePTR, ClassIN, 3600)
resPTR, err := p.ResourcePTR()
if err != nil {
t.Fatalf("%v section, p.ResourcePTR(): unexpected error: %v", curSectionName, err)
}
equalRData(t, "p.ResourcePTR()", resourcePTR, resPTR)
parseResourceHeader(curSectionName, TypeTXT, ClassIN, 3600)
resRawTXT, err := p.RawResourceTXT()
if err != nil {
t.Fatalf("%v section, p.RawResourceTXT(): unexpected error: %v", curSectionName, err)
}
equalRData(t, "p.RawResourceTXT() 1", rawResourceTXT, resRawTXT)
parseResourceHeader(curSectionName, TypeTXT, ClassIN, 3600)
resTXT, err := p.RawResourceTXT()
if err != nil {
t.Fatalf("%v section, p.RawResourceTXT(): unexpected error: %v", curSectionName, err)
}
equalRData(t, "p.RawResourceTXT() 2", rawResourceTXT, resTXT)
parseResourceHeader(curSectionName, TypeCNAME, ClassIN, 3600)
resCNAME, err := p.ResourceCNAME()
if err != nil {
t.Fatalf("%v section, p.ResourceCNAME(): unexpected error: %v", curSectionName, err)
}
equalRData(t, "p.ResourceCNAME()", resourceCNAME, resCNAME)
parseResourceHeader(curSectionName, TypeMX, ClassIN, 3600)
resMX, err := p.ResourceMX()
if err != nil {
t.Fatalf("%v section, p.ResourceMX(): unexpected error: %v", curSectionName, err)
}
equalRData(t, "p.ResourceMX()", resourceMX, resMX)
parseResourceHeader(curSectionName, TypeOPT, ClassIN, 3600)
resOPT, err := p.ResourceOPT()
if err != nil {
t.Fatalf("%v section, p.ResourceOPT(): unexpected error: %v", curSectionName, err)
}
if len(resOPT.Options) != len(resourceOPT.Options) {
t.Fatalf("%v section, p.ResourceOPT() = %#v, want: %#v", curSectionName, resOPT, resourceOPT)
}
for i := 0; i < len(resOPT.Options); i++ {
equalRData(t, fmt.Sprintf("p.ResourceOPT().Options[%v]", i), resourceOPT.Options[i], resOPT.Options[i])
}
}
if err := p.End(); err != nil {
t.Fatalf("p.End() unexpected error: %v", err)
}
}
func equalRData(t *testing.T, name string, r1, r2 any) {
r1val := reflect.ValueOf(r1)
r2val := reflect.ValueOf(r2)
if r1val.Kind() == reflect.Pointer {
r1val = r1val.Elem()
r2val = r2val.Elem()