commit 2c2a1c508469fa11a817bb17b60ed28bb8da4fa2 · seiso.moe/magna

+89 -23

domain_test.go

···

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       )

     

       8
        
       

     

       9
        
       func TestDecodeDomain(t *testing.T) {

     

       10
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       	buf := []byte{

     

       11
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       		0x03, 0x63, 0x6f, 0x6d, 0x00,

     

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       12
        
       	}

     

       13
        
       

     

       14
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       	domain, offset, err := decode_domain(buf, 0)

     

       15
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       	assert.Equal(t, "com", domain)

     

       16
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       	assert.Equal(t, 5, offset)

     

       17
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       	assert.NoError(t, err)

     

       18
       -
       }

     

       19
        
       

     

       20
       -
       func TestDecodeDomainWithCompression(t *testing.T) {

     

       21
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       	buf := []byte{

     

       22
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       		0x03, 0x63, 0x6f, 0x6d, 0x00, 0x01, 0x63, 0xC0, 0x00,

     

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       23
        
       	}

     

       24
       -
       

     

       25
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       	domain, offset, err := decode_domain(buf, 5)

     

       26
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       	assert.Equal(t, "c.com", domain)

     

       27
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       	assert.Equal(t, 9, offset)

     

       28
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       	assert.NoError(t, err)

     

       29
        
       }

     

       30
        
       

     

       31
       -
       func TestDecodeDomainWithCompressionLoop(t *testing.T) {

     

       32
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       	buf := []byte{

     

       33
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       		0x03, 0x63, 0x6f, 0x6d, 0xC0, 0x00,

     

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       34
        
       	}

     

       35
        
       

     

       36
       -
       	domain, offset, err := decode_domain(buf, 0)

     

       37
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       	assert.Equal(t, "", domain)

     

       38
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       	assert.Equal(t, 6, offset)

     

       39
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       	assert.Error(t, err)

     

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       40
        
       }

     

       41
        
       

     

       42
        
       func FuzzDecodeDomain(f *testing.F) {

     
···

       52
        
       		},

     

       53
        
       	}

     

       54
        
       	for _, tc := range testcases {

     

       55
       -
       		f.Add(tc) // Use f.Add to provide a seed corpus

     

       56
        
       	}

     

       57
        
       	f.Fuzz(func(t *testing.T, msg []byte) {

     

       58
        
       		decode_domain(msg, 0)

···

       7
        
       )

     

       8
        
       

     

       9
        
       func TestDecodeDomain(t *testing.T) {

     

       10
       +
       	tests := []struct {

     

       11
       +
       		name           string

     

       12
       +
       		offset         int

     

       13
       +
       		input          []byte

     

       14
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       		expectedDomain string

     

       15
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       		expectedOffset int

     

       16
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       		expectedError  error

     

       17
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       	}{

     

       18
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       		{

     

       19
       +
       			name:           "Simple domain",

     

       20
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       			input:          []byte{3, 'w', 'w', 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0},

     

       21
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       			expectedDomain: "www.example.com",

     

       22
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       			expectedOffset: 17,

     

       23
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       			expectedError:  nil,

     

       24
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       		},

     

       25
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       		{

     

       26
       +
       			name:           "Domain with compression",

     

       27
       +
       			offset:         17,

     

       28
       +
       			input:          []byte{3, 'w', 'w', 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0, 3, 'f', 'o', 'o', 0xC0, 0},

     

       29
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       			expectedDomain: "foo.www.example.com",

     

       30
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       			expectedOffset: 23,

     

       31
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       			expectedError:  nil,

     

       32
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       		},

     

       33
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       		{

     

       34
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       			name:           "Invalid label length",

     

       35
       +
       			input:          []byte{64, 'x'},

     

       36
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       			expectedDomain: "",

     

       37
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       			expectedOffset: 2,

     

       38
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       			expectedError:  &InvalidLabelError{Length: 64},

     

       39
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       		},

     

       40
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       		{

     

       41
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       			name:           "Compression loop",

     

       42
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       			input:          []byte{0xC0, 0, 0xC0, 0},

     

       43
       +
       			expectedDomain: "",

     

       44
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       			expectedOffset: 4,

     

       45
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       			expectedError:  &DomainCompressionError{},

     

       46
       +
       		},

     

       47
       +
       		{

     

       48
       +
       			name:           "Truncated input",

     

       49
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       			input:          []byte{3, 'w', 'w'},

     

       50
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       			expectedDomain: "",

     

       51
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       			expectedOffset: 3,

     

       52
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       			expectedError:  &BufferOverflowError{Length: 3, Offset: 4},

     

       53
       +
       		},

     

       54
        
       	}

     

       55
        
       

     

       56
       +
       	for _, tt := range tests {

     

       57
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       		t.Run(tt.name, func(t *testing.T) {

     

       58
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       			domain, offset, err := decode_domain(tt.input, tt.offset)

     

       0
        
       
     

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       59
        
       

     

       60
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       			t.Log(tt.name)

     

       61
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       			assert.Equal(t, tt.expectedError, err)

     

       62
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       			assert.Equal(t, tt.expectedDomain, domain)

     

       63
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       			assert.Equal(t, tt.expectedOffset, offset)

     

       64
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       		})

     

       65
        
       	}

     

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       66
        
       }

     

       67
        
       

     

       68
       +
       func TestEncodeDomain(t *testing.T) {

     

       69
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       	tests := []struct {

     

       70
       +
       		name       string

     

       71
       +
       		input      string

     

       72
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       		offsets    map[string]uint16

     

       73
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       		expected   []byte

     

       74
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       		newOffsets map[string]uint16

     

       75
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       	}{

     

       76
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       		{

     

       77
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       			name:       "Simple domain",

     

       78
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       			input:      "example.com",

     

       79
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       			offsets:    make(map[string]uint16),

     

       80
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       			expected:   []byte{7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0},

     

       81
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       			newOffsets: map[string]uint16{"example.com": 0, "com": 8},

     

       82
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       		},

     

       83
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       		{

     

       84
       +
       			name:       "Domain with existing offset",

     

       85
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       			input:      "test.example.com",

     

       86
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       			offsets:    map[string]uint16{"example.com": 10},

     

       87
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       			expected:   []byte{4, 't', 'e', 's', 't', 0xC0, 0x0A},

     

       88
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       			newOffsets: map[string]uint16{"test.example.com": 0, "example.com": 10},

     

       89
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       		},

     

       90
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       		{

     

       91
       +
       			name:       "Multiple subdomains",

     

       92
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       			input:      "a.b.c.d",

     

       93
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       			offsets:    make(map[string]uint16),

     

       94
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       			expected:   []byte{1, 'a', 1, 'b', 1, 'c', 1, 'd', 0},

     

       95
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       			newOffsets: map[string]uint16{"a.b.c.d": 0, "b.c.d": 2, "c.d": 4, "d": 6},

     

       96
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       		},

     

       97
        
       	}

     

       98
        
       

     

       99
       +
       	for _, tt := range tests {

     

       100
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       		t.Run(tt.name, func(t *testing.T) {

     

       101
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       			result := encode_domain([]byte{}, tt.input, &tt.offsets)

     

       102
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       			assert.Equal(t, tt.expected, result, "Encoded domain does not match expected output")

     

       103
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       			assert.Equal(t, tt.newOffsets, tt.offsets, "Offsets map does not match expected state")

     

       104
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       		})

     

       105
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       	}

     

       106
        
       }

     

       107
        
       

     

       108
        
       func FuzzDecodeDomain(f *testing.F) {

     
···

       118
        
       		},

     

       119
        
       	}

     

       120
        
       	for _, tc := range testcases {

     

       121
       +
       		f.Add(tc)

     

       122
        
       	}

     

       123
        
       	f.Fuzz(func(t *testing.T, msg []byte) {

     

       124
        
       		decode_domain(msg, 0)

+71

errors_test.go

···

       1
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       package magna

     

       2
       +
       

     

       3
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       import (

     

       4
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       	"testing"

     

       5
       +
       

     

       6
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       	"github.com/stretchr/testify/assert"

     

       7
       +
       )

     

       8
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       9
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       func TestBufferOverflowError(t *testing.T) {

     

       10
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       	tests := []struct {

     

       11
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       		name     string

     

       12
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       		length   int

     

       13
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       		offset   int

     

       14
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       		expected string

     

       15
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       	}{

     

       16
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       		{"basic overflow", 10, 15, "magna: offset 15 is past the buffer length 10"},

     

       17
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       		{"zero length", 0, 5, "magna: offset 5 is past the buffer length 0"},

     

       18
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       		{"negative offset", 10, -1, "magna: offset -1 is past the buffer length 10"},

     

       19
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       	}

     

       20
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       21
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       	for _, tt := range tests {

     

       22
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       		t.Run(tt.name, func(t *testing.T) {

     

       23
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       			err := &BufferOverflowError{Length: tt.length, Offset: tt.offset}

     

       24
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       			assert.Equal(t, tt.expected, err.Error())

     

       25
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       		})

     

       26
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       	}

     

       27
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       }

     

       28
       +
       

     

       29
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       func TestInvalidLabelError(t *testing.T) {

     

       30
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       	tests := []struct {

     

       31
       +
       		name     string

     

       32
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       		length   int

     

       33
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       		expected string

     

       34
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       	}{

     

       35
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       		{"zero length", 0, "magna: received invalid label length 0"},

     

       36
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       		{"negative length", -1, "magna: received invalid label length -1"},

     

       37
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       		{"large length", 1000, "magna: received invalid label length 1000"},

     

       38
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       	}

     

       39
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       40
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       	for _, tt := range tests {

     

       41
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       		t.Run(tt.name, func(t *testing.T) {

     

       42
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       			err := &InvalidLabelError{Length: tt.length}

     

       43
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       			assert.Equal(t, tt.expected, err.Error())

     

       44
       +
       		})

     

       45
       +
       	}

     

       46
       +
       }

     

       47
       +
       

     

       48
       +
       func TestDomainCompressionError(t *testing.T) {

     

       49
       +
       	err := &DomainCompressionError{}

     

       50
       +
       	expected := "magna: loop detected in domain compression"

     

       51
       +
       	assert.Equal(t, expected, err.Error())

     

       52
       +
       }

     

       53
       +
       

     

       54
       +
       func TestMagnaError(t *testing.T) {

     

       55
       +
       	tests := []struct {

     

       56
       +
       		name     string

     

       57
       +
       		message  string

     

       58
       +
       		expected string

     

       59
       +
       	}{

     

       60
       +
       		{"empty message", "", "magna: "},

     

       61
       +
       		{"basic message", "test error", "magna: test error"},

     

       62
       +
       		{"message with punctuation", "error: invalid input!", "magna: error: invalid input!"},

     

       63
       +
       	}

     

       64
       +
       

     

       65
       +
       	for _, tt := range tests {

     

       66
       +
       		t.Run(tt.name, func(t *testing.T) {

     

       67
       +
       			err := &MagnaError{Message: tt.message}

     

       68
       +
       			assert.Equal(t, tt.expected, err.Error())

     

       69
       +
       		})

     

       70
       +
       	}

     

       71
       +
       }

+348 -49

header_test.go

···

       1
        
       package magna

     

       2
        
       

     

       3
        
       import (

     

       0
        
       
     

       4
        
       	"testing"

     

       5
        
       

     

       6
        
       	"github.com/stretchr/testify/assert"

     

       7
        
       )

     

       8
        
       

     

       9
        
       func TestHeaderDecode(t *testing.T) {

     

       10
       -
       	bytes := []byte{

     

       11
       -
       		0x01, 0x02, // ID

     

       12
       -
       		0xaa, 0xaa, // QR, Opcode, AA, TC, RD, RA, Z, RCODE

     

       13
       -
       		0x00, 0x01, // QDCOUNT

     

       14
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       		0x00, 0x02, // ANCOUNT

     

       15
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       		0x00, 0x03, // NSCOUNT

     

       16
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       		0x00, 0x04, // ARCOUNT

     

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       17
        
       	}

     

       18
        
       

     

       19
       -
       	var header Header

     

       20
       -
       	offset, err := header.Decode(bytes, 0)

     

       21
       -
       	if err != nil {

     

       22
       -
       		t.Errorf("error should be nil\n")

     

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       23
        
       	}

     

       0
        
       
     

       24
        
       

     

       25
       -
       	if offset != 12 {

     

       26
       -
       		t.Errorf("offset should be 12 not %v\n", offset)

     

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       27
        
       	}

     

       28
        
       

     

       29
       -
       	assert.Equal(t, header.ID, uint16(258))

     

       30
       -
       	assert.Equal(t, header.QR, true)

     

       31
       -
       	assert.Equal(t, header.OPCode, OPCode(5))

     

       32
       -
       	assert.Equal(t, header.AA, false)

     

       33
       -
       	assert.Equal(t, header.TC, true)

     

       34
       -
       	assert.Equal(t, header.RD, false)

     

       35
       -
       	assert.Equal(t, header.RA, true)

     

       36
       -
       	assert.Equal(t, header.Z, uint8(0b010))

     

       37
       -
       	assert.Equal(t, header.RCode, RCode(0b1010))

     

       38
       -
       	assert.Equal(t, header.QDCount, uint16(1))

     

       39
       -
       	assert.Equal(t, header.ANCount, uint16(2))

     

       40
       -
       	assert.Equal(t, header.NSCount, uint16(3))

     

       41
       -
       	assert.Equal(t, header.ARCount, uint16(4))

     

       0
        
       
     

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       42
        
       }

     

       43
        
       

     

       44
        
       func TestHeaderEncode(t *testing.T) {

     

       45
       -
       	bytes := []byte{

     

       46
       -
       		0x01, 0x02, // ID

     

       47
       -
       		0xaa, 0xaa, // QR, Opcode, AA, TC, RD, RA, Z, RCODE

     

       48
       -
       		0x00, 0x01, // QDCOUNT

     

       49
       -
       		0x00, 0x02, // ANCOUNT

     

       50
       -
       		0x00, 0x03, // NSCOUNT

     

       51
       -
       		0x00, 0x04, // ARCOUNT

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       52
        
       	}

     

       0
        
       
     

       53
        
       

     

       54
       -
       	var header Header

     

       55
       -
       	_, err := header.Decode(bytes, 0)

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       56
        
       	assert.NoError(t, err)

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       57
        
       

     

       58
       -
       	actual := header.Encode()

     

       59
       -
       	assert.Equal(t, bytes, actual)

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       60
        
       }

     

       61
        
       

     

       62
        
       func FuzzDecodeHeader(f *testing.F) {

     

       63
        
       	testcases := [][]byte{

     

       64
       -
       		{

     

       65
       -
       			0x01, 0x02,

     

       66
       -
       			0xaa, 0xaa,

     

       67
       -
       			0x00, 0x01,

     

       68
       -
       			0x00, 0x02,

     

       69
       -
       			0x00, 0x03,

     

       70
       -
       			0x00, 0x04,

     

       71
       -
       		},

     

       72
        
       	}

     

       0
        
       
     

       73
        
       	for _, tc := range testcases {

     

       74
       -
       		f.Add(tc) // Use f.Add to provide a seed corpus

     

       75
        
       	}

     

       76
       -
       	var header Header

     

       77
       -
       	f.Fuzz(func(t *testing.T, msg []byte) {

     

       78
       -
       		header.Decode(msg, 0)

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       79
        
       	})

     

       80
        
       }

···

       1
        
       package magna

     

       2
        
       

     

       3
        
       import (

     

       4
       +
       	"encoding/binary"

     

       5
        
       	"testing"

     

       6
        
       

     

       7
        
       	"github.com/stretchr/testify/assert"

     

       8
        
       )

     

       9
        
       

     

       10
        
       func TestHeaderDecode(t *testing.T) {

     

       11
       +
       	tests := []struct {

     

       12
       +
       		name           string

     

       13
       +
       		input          []byte

     

       14
       +
       		expectedHeader Header

     

       15
       +
       		expectedOffset int

     

       16
       +
       		expectedErr    error

     

       17
       +
       	}{

     

       18
       +
       		{

     

       19
       +
       			name:  "Valid header",

     

       20
       +
       			input: []byte{0x12, 0x34, 0x81, 0x80, 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04},

     

       21
       +
       			expectedHeader: Header{

     

       22
       +
       				ID:      0x1234,

     

       23
       +
       				QR:      true,

     

       24
       +
       				OPCode:  OPCode(0),

     

       25
       +
       				AA:      false,

     

       26
       +
       				TC:      false,

     

       27
       +
       				RD:      true,

     

       28
       +
       				RA:      true,

     

       29
       +
       				Z:       0,

     

       30
       +
       				RCode:   RCode(0),

     

       31
       +
       				QDCount: 1,

     

       32
       +
       				ANCount: 2,

     

       33
       +
       				NSCount: 3,

     

       34
       +
       				ARCount: 4,

     

       35
       +
       			},

     

       36
       +
       			expectedOffset: 12,

     

       37
       +
       			expectedErr:    nil,

     

       38
       +
       		},

     

       39
       +
       		{

     

       40
       +
       			name:           "Insufficient buffer length",

     

       41
       +
       			input:          []byte{0x12, 0x34, 0x81},

     

       42
       +
       			expectedHeader: Header{},

     

       43
       +
       			expectedOffset: 3,

     

       44
       +
       			expectedErr:    &BufferOverflowError{Length: 3, Offset: 3},

     

       45
       +
       		},

     

       46
       +
       		{

     

       47
       +
       			name:           "Invalid ID",

     

       48
       +
       			input:          []byte{0x12},

     

       49
       +
       			expectedHeader: Header{},

     

       50
       +
       			expectedOffset: 1,

     

       51
       +
       			expectedErr:    &BufferOverflowError{Length: 1, Offset: 1},

     

       52
       +
       		},

     

       53
       +
       		{

     

       54
       +
       			name:           "Missing QDCount",

     

       55
       +
       			input:          []byte{0x12, 0x34, 0x81, 0x80, 0x00},

     

       56
       +
       			expectedHeader: Header{},

     

       57
       +
       			expectedOffset: 5,

     

       58
       +
       			expectedErr:    &BufferOverflowError{},

     

       59
       +
       		},

     

       60
       +
       		{

     

       61
       +
       			name:           "Missing ANCount",

     

       62
       +
       			input:          []byte{0x12, 0x34, 0x81, 0x80, 0x00, 0x01},

     

       63
       +
       			expectedHeader: Header{},

     

       64
       +
       			expectedOffset: 6,

     

       65
       +
       			expectedErr:    &BufferOverflowError{},

     

       66
       +
       		},

     

       67
       +
       		{

     

       68
       +
       			name:           "Missing NSCount",

     

       69
       +
       			input:          []byte{0x12, 0x34, 0x81, 0x80, 0x00, 0x01, 0x00, 0x02},

     

       70
       +
       			expectedHeader: Header{},

     

       71
       +
       			expectedOffset: 8,

     

       72
       +
       			expectedErr:    &BufferOverflowError{},

     

       73
       +
       		},

     

       74
       +
       		{

     

       75
       +
       			name:           "Missing ARCount",

     

       76
       +
       			input:          []byte{0x12, 0x34, 0x81, 0x80, 0x00, 0x01, 0x00, 0x02, 0x00, 0x03},

     

       77
       +
       			expectedHeader: Header{},

     

       78
       +
       			expectedOffset: 10,

     

       79
       +
       			expectedErr:    &BufferOverflowError{},

     

       80
       +
       		},

     

       81
        
       	}

     

       82
        
       

     

       83
       +
       	for _, tt := range tests {

     

       84
       +
       		t.Run(tt.name, func(t *testing.T) {

     

       85
       +
       			h := &Header{}

     

       86
       +
       			offset, err := h.Decode(tt.input, 0)

     

       87
       +
       

     

       88
       +
       			if tt.expectedErr != nil {

     

       89
       +
       				assert.Error(t, err)

     

       90
       +
       				assert.IsType(t, tt.expectedErr, err)

     

       91
       +
       			} else {

     

       92
       +
       				assert.NoError(t, err)

     

       93
       +
       				assert.Equal(t, tt.expectedHeader, *h)

     

       94
       +
       			}

     

       95
       +
       

     

       96
       +
       			assert.Equal(t, tt.expectedOffset, offset)

     

       97
       +
       		})

     

       98
        
       	}

     

       99
       +
       }

     

       100
        
       

     

       101
       +
       func TestHeaderDecodeFlags(t *testing.T) {

     

       102
       +
       	tests := []struct {

     

       103
       +
       		name     string

     

       104
       +
       		flags    uint16

     

       105
       +
       		expected Header

     

       106
       +
       	}{

     

       107
       +
       		{

     

       108
       +
       			name:  "All flags set",

     

       109
       +
       			flags: 0xFFFF,

     

       110
       +
       			expected: Header{

     

       111
       +
       				QR:     true,

     

       112
       +
       				OPCode: OPCode(15),

     

       113
       +
       				AA:     true,

     

       114
       +
       				TC:     true,

     

       115
       +
       				RD:     true,

     

       116
       +
       				RA:     true,

     

       117
       +
       				Z:      7,

     

       118
       +
       				RCode:  RCode(15),

     

       119
       +
       			},

     

       120
       +
       		},

     

       121
       +
       		{

     

       122
       +
       			name:  "No flags set",

     

       123
       +
       			flags: 0x0000,

     

       124
       +
       			expected: Header{

     

       125
       +
       				QR:     false,

     

       126
       +
       				OPCode: OPCode(0),

     

       127
       +
       				AA:     false,

     

       128
       +
       				TC:     false,

     

       129
       +
       				RD:     false,

     

       130
       +
       				RA:     false,

     

       131
       +
       				Z:      0,

     

       132
       +
       				RCode:  RCode(0),

     

       133
       +
       			},

     

       134
       +
       		},

     

       135
       +
       		{

     

       136
       +
       			name:  "Mixed flags",

     

       137
       +
       			flags: 0x8510,

     

       138
       +
       			expected: Header{

     

       139
       +
       				QR:     true,

     

       140
       +
       				OPCode: OPCode(0),

     

       141
       +
       				AA:     true,

     

       142
       +
       				TC:     false,

     

       143
       +
       				RD:     true,

     

       144
       +
       				RA:     false,

     

       145
       +
       				Z:      1,

     

       146
       +
       				RCode:  RCode(0),

     

       147
       +
       			},

     

       148
       +
       		},

     

       149
        
       	}

     

       150
        
       

     

       151
       +
       	for _, tt := range tests {

     

       152
       +
       		t.Run(tt.name, func(t *testing.T) {

     

       153
       +
       			input := []byte{

     

       154
       +
       				0x00, 0x00,

     

       155
       +
       				byte(tt.flags >> 8), byte(tt.flags),

     

       156
       +
       				0x00, 0x00,

     

       157
       +
       				0x00, 0x00,

     

       158
       +
       				0x00, 0x00,

     

       159
       +
       				0x00, 0x00,

     

       160
       +
       			}

     

       161
       +
       

     

       162
       +
       			h := &Header{}

     

       163
       +
       			_, err := h.Decode(input, 0)

     

       164
       +
       

     

       165
       +
       			assert.NoError(t, err)

     

       166
       +
       			assert.Equal(t, tt.expected.QR, h.QR)

     

       167
       +
       			assert.Equal(t, tt.expected.OPCode, h.OPCode)

     

       168
       +
       			assert.Equal(t, tt.expected.AA, h.AA)

     

       169
       +
       			assert.Equal(t, tt.expected.TC, h.TC)

     

       170
       +
       			assert.Equal(t, tt.expected.RD, h.RD)

     

       171
       +
       			assert.Equal(t, tt.expected.RA, h.RA)

     

       172
       +
       			assert.Equal(t, tt.expected.Z, h.Z)

     

       173
       +
       			assert.Equal(t, tt.expected.RCode, h.RCode)

     

       174
       +
       		})

     

       175
       +
       	}

     

       176
        
       }

     

       177
        
       

     

       178
        
       func TestHeaderEncode(t *testing.T) {

     

       179
       +
       	tests := []struct {

     

       180
       +
       		name     string

     

       181
       +
       		header   Header

     

       182
       +
       		expected []byte

     

       183
       +
       	}{

     

       184
       +
       		{

     

       185
       +
       			name: "All fields set",

     

       186
       +
       			header: Header{

     

       187
       +
       				ID:      0x1234,

     

       188
       +
       				QR:      true,

     

       189
       +
       				OPCode:  OPCode(1),

     

       190
       +
       				AA:      true,

     

       191
       +
       				TC:      true,

     

       192
       +
       				RD:      true,

     

       193
       +
       				RA:      true,

     

       194
       +
       				Z:       5,

     

       195
       +
       				RCode:   RCode(3),

     

       196
       +
       				QDCount: 1,

     

       197
       +
       				ANCount: 2,

     

       198
       +
       				NSCount: 3,

     

       199
       +
       				ARCount: 4,

     

       200
       +
       			},

     

       201
       +
       			expected: []byte{

     

       202
       +
       				0x12, 0x34,

     

       203
       +
       				0x8f, 0xd3,

     

       204
       +
       				0x00, 0x01,

     

       205
       +
       				0x00, 0x02,

     

       206
       +
       				0x00, 0x03,

     

       207
       +
       				0x00, 0x04,

     

       208
       +
       			},

     

       209
       +
       		},

     

       210
       +
       		{

     

       211
       +
       			name: "No flags set",

     

       212
       +
       			header: Header{

     

       213
       +
       				ID:      0x5678,

     

       214
       +
       				QR:      false,

     

       215
       +
       				OPCode:  OPCode(0),

     

       216
       +
       				AA:      false,

     

       217
       +
       				TC:      false,

     

       218
       +
       				RD:      false,

     

       219
       +
       				RA:      false,

     

       220
       +
       				Z:       0,

     

       221
       +
       				RCode:   RCode(0),

     

       222
       +
       				QDCount: 5,

     

       223
       +
       				ANCount: 6,

     

       224
       +
       				NSCount: 7,

     

       225
       +
       				ARCount: 8,

     

       226
       +
       			},

     

       227
       +
       			expected: []byte{

     

       228
       +
       				0x56, 0x78,

     

       229
       +
       				0x00, 0x00,

     

       230
       +
       				0x00, 0x05,

     

       231
       +
       				0x00, 0x06,

     

       232
       +
       				0x00, 0x07,

     

       233
       +
       				0x00, 0x08,

     

       234
       +
       			},

     

       235
       +
       		},

     

       236
       +
       		{

     

       237
       +
       			name: "Mixed flags",

     

       238
       +
       			header: Header{

     

       239
       +
       				ID:      0x9abc,

     

       240
       +
       				QR:      true,

     

       241
       +
       				OPCode:  OPCode(2),

     

       242
       +
       				AA:      false,

     

       243
       +
       				TC:      true,

     

       244
       +
       				RD:      false,

     

       245
       +
       				RA:      true,

     

       246
       +
       				Z:       3,

     

       247
       +
       				RCode:   RCode(4),

     

       248
       +
       				QDCount: 9,

     

       249
       +
       				ANCount: 10,

     

       250
       +
       				NSCount: 11,

     

       251
       +
       				ARCount: 12,

     

       252
       +
       			},

     

       253
       +
       			expected: []byte{

     

       254
       +
       				0x9a, 0xbc,

     

       255
       +
       				0x92, 0xb4,

     

       256
       +
       				0x00, 0x09,

     

       257
       +
       				0x00, 0x0a,

     

       258
       +
       				0x00, 0x0b,

     

       259
       +
       				0x00, 0x0c,

     

       260
       +
       			},

     

       261
       +
       		},

     

       262
       +
       	}

     

       263
       +
       

     

       264
       +
       	for _, tt := range tests {

     

       265
       +
       		t.Run(tt.name, func(t *testing.T) {

     

       266
       +
       			encoded := tt.header.Encode()

     

       267
       +
       			assert.Equal(t, tt.expected, encoded)

     

       268
       +
       		})

     

       269
        
       	}

     

       270
       +
       }

     

       271
        
       

     

       272
       +
       func TestHeaderEncodeDecodeRoundTrip(t *testing.T) {

     

       273
       +
       	originalHeader := Header{

     

       274
       +
       		ID:      0xdcba,

     

       275
       +
       		QR:      true,

     

       276
       +
       		OPCode:  OPCode(3),

     

       277
       +
       		AA:      true,

     

       278
       +
       		TC:      false,

     

       279
       +
       		RD:      true,

     

       280
       +
       		RA:      false,

     

       281
       +
       		Z:       6,

     

       282
       +
       		RCode:   RCode(2),

     

       283
       +
       		QDCount: 13,

     

       284
       +
       		ANCount: 14,

     

       285
       +
       		NSCount: 15,

     

       286
       +
       		ARCount: 16,

     

       287
       +
       	}

     

       288
       +
       

     

       289
       +
       	encoded := originalHeader.Encode()

     

       290
       +
       

     

       291
       +
       	decodedHeader := &Header{}

     

       292
       +
       	offset, err := decodedHeader.Decode(encoded, 0)

     

       293
       +
       

     

       294
        
       	assert.NoError(t, err)

     

       295
       +
       	assert.Equal(t, len(encoded), offset)

     

       296
       +
       	assert.Equal(t, originalHeader, *decodedHeader)

     

       297
       +
       }

     

       298
        
       

     

       299
       +
       func TestHeaderEncodeFlagCombinations(t *testing.T) {

     

       300
       +
       	testCases := []struct {

     

       301
       +
       		name     string

     

       302
       +
       		header   Header

     

       303
       +
       		expected uint16

     

       304
       +
       	}{

     

       305
       +
       		{"QR flag", Header{QR: true}, 0x8000},

     

       306
       +
       		{"OPCode", Header{OPCode: OPCode(5)}, 0x2800},

     

       307
       +
       		{"AA flag", Header{AA: true}, 0x0400},

     

       308
       +
       		{"TC flag", Header{TC: true}, 0x0200},

     

       309
       +
       		{"RD flag", Header{RD: true}, 0x0100},

     

       310
       +
       		{"RA flag", Header{RA: true}, 0x0080},

     

       311
       +
       		{"Z value", Header{Z: 5}, 0x0050},

     

       312
       +
       		{"RCode", Header{RCode: RCode(7)}, 0x0007},

     

       313
       +
       		{"All flags set", Header{QR: true, OPCode: OPCode(15), AA: true, TC: true, RD: true, RA: true, Z: 7, RCode: RCode(15)}, 0xffff},

     

       314
       +
       	}

     

       315
       +
       

     

       316
       +
       	for _, tc := range testCases {

     

       317
       +
       		t.Run(tc.name, func(t *testing.T) {

     

       318
       +
       			encoded := tc.header.Encode()

     

       319
       +
       			flags := binary.BigEndian.Uint16(encoded[2:4])

     

       320
       +
       			assert.Equal(t, tc.expected, flags)

     

       321
       +
       		})

     

       322
       +
       	}

     

       323
        
       }

     

       324
        
       

     

       325
        
       func FuzzDecodeHeader(f *testing.F) {

     

       326
        
       	testcases := [][]byte{

     

       327
       +
       		{0x12, 0x34, 0x81, 0x80, 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04},

     

       328
       +
       		{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},

     

       329
       +
       		{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       330
        
       	}

     

       331
       +
       

     

       332
        
       	for _, tc := range testcases {

     

       333
       +
       		f.Add(tc)

     

       334
        
       	}

     

       335
       +
       

     

       336
       +
       	f.Fuzz(func(t *testing.T, data []byte) {

     

       337
       +
       		// limit to only 12 bytes

     

       338
       +
       		if len(data) > 12 {

     

       339
       +
       			data = data[0:12]

     

       340
       +
       		}

     

       341
       +
       

     

       342
       +
       		h := &Header{}

     

       343
       +
       		offset, err := h.Decode(data, 0)

     

       344
       +
       		if err != nil {

     

       345
       +
       			switch err.(type) {

     

       346
       +
       			case *BufferOverflowError, *InvalidLabelError:

     

       347
       +
       				// these are expected error types

     

       348
       +
       			default:

     

       349
       +
       				t.Errorf("unexpected error type: %T", err)

     

       350
       +
       			}

     

       351
       +
       			return

     

       352
       +
       		}

     

       353
       +
       

     

       354
       +
       		if offset != len(data) {

     

       355
       +
       			t.Errorf("offset (%d) does not match data length (%d)", offset, len(data))

     

       356
       +
       		}

     

       357
       +
       

     

       358
       +
       		if h.OPCode > 15 {

     

       359
       +
       			t.Errorf("invalid OPCode: %d", h.OPCode)

     

       360
       +
       		}

     

       361
       +
       

     

       362
       +
       		if h.Z > 7 {

     

       363
       +
       			t.Errorf("invalid Z value: %d", h.Z)

     

       364
       +
       		}

     

       365
       +
       

     

       366
       +
       		if h.RCode > 15 {

     

       367
       +
       			t.Errorf("invalid RCode: %d", h.RCode)

     

       368
       +
       		}

     

       369
       +
       

     

       370
       +
       		encoded := h.Encode()

     

       371
       +
       		if len(encoded) != len(data) {

     

       372
       +
       			t.Errorf("encoded length (%d) does not match input length (%d)", len(encoded), len(data))

     

       373
       +
       

     

       374
       +
       			for i := 0; i < len(data); i++ {

     

       375
       +
       				t.Errorf("mismatch at position: %d: encoded %02x, input: %02x", i, encoded[i], data[i])

     

       376
       +
       			}

     

       377
       +
       		}

     

       378
        
       	})

     

       379
        
       }

+49

message.go

···

       1
        
       package magna

     

       2
        
       

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       3
        
       // Decode decodes a DNS packet.

     

       4
        
       func (m *Message) Decode(buf []byte) (err error) {

     

       5
        
       	offset, err := m.Header.Decode(buf, 0)

     
···

       74
        
       

     

       75
        
       	return bytes

     

       76
        
       }

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0

···

       1
        
       package magna

     

       2
        
       

     

       3
       +
       import (

     

       4
       +
       	"math/rand"

     

       5
       +
       )

     

       6
       +
       

     

       7
        
       // Decode decodes a DNS packet.

     

       8
        
       func (m *Message) Decode(buf []byte) (err error) {

     

       9
        
       	offset, err := m.Header.Decode(buf, 0)

     
···

       78
        
       

     

       79
        
       	return bytes

     

       80
        
       }

     

       81
       +
       

     

       82
       +
       func CreateRequest(op OPCode, rd bool) *Message {

     

       83
       +
       	return &Message{

     

       84
       +
       		Header: Header{

     

       85
       +
       			ID:      uint16(rand.Intn(65534) + 1),

     

       86
       +
       			QR:      false,

     

       87
       +
       			OPCode:  op,

     

       88
       +
       			AA:      false,

     

       89
       +
       			TC:      false,

     

       90
       +
       			RD:      rd,

     

       91
       +
       			RA:      false,

     

       92
       +
       			Z:       0,

     

       93
       +
       			RCode:   NOERROR,

     

       94
       +
       			QDCount: 0,

     

       95
       +
       			ARCount: 0,

     

       96
       +
       			NSCount: 0,

     

       97
       +
       			ANCount: 0,

     

       98
       +
       		},

     

       99
       +
       		Question:   make([]Question, 0),

     

       100
       +
       		Answer:     make([]ResourceRecord, 0),

     

       101
       +
       		Additional: make([]ResourceRecord, 0),

     

       102
       +
       		Authority:  make([]ResourceRecord, 0),

     

       103
       +
       	}

     

       104
       +
       }

     

       105
       +
       

     

       106
       +
       func (m *Message) CreateReply(req *Message) *Message {

     

       107
       +
       	m.Header.ID = req.Header.ID

     

       108
       +
       	m.Header.QR = true

     

       109
       +
       	m.Header.OPCode = req.Header.OPCode

     

       110
       +
       

     

       111
       +
       	return m

     

       112
       +
       }

     

       113
       +
       

     

       114
       +
       func (m *Message) AddQuestion(q Question) *Message {

     

       115
       +
       	m.Header.QDCount += 1

     

       116
       +
       	m.Question = append(m.Question, q)

     

       117
       +
       

     

       118
       +
       	return m

     

       119
       +
       }

     

       120
       +
       

     

       121
       +
       func (m *Message) SetRCode(rc RCode) *Message {

     

       122
       +
       	m.Header.RCode = rc

     

       123
       +
       

     

       124
       +
       	return m

     

       125
       +
       }

+105 -176

message_test.go

···

       1
        
       package magna

     

       2
        
       

     

       3
        
       import (

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       4
        
       	"testing"

     

       5
        
       

     

       6
        
       	"github.com/stretchr/testify/assert"

     

       7
        
       )

     

       8
        
       

     

       9
        
       func TestMessageDecode(t *testing.T) {

     

       10
       -
       	bytes := []byte{

     

       11
       -
       		0x8e, 0x19, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x04, 0x6e, 0x65,

     

       12
       -
       		0x77, 0x73, 0x0b, 0x79, 0x63, 0x6f, 0x6d, 0x62, 0x69, 0x6e, 0x61, 0x74, 0x6f, 0x72, 0x03,

     

       13
       -
       		0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01, 0xc0, 0x0c, 0x00, 0x01, 0x00, 0x01, 0x00,

     

       14
       -
       		0x00, 0x00, 0x01, 0x00, 0x04, 0xd1, 0xd8, 0xe6, 0xcf,

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       15
        
       	}

     

       16
        
       

     

       17
       -
       	var msg Message

     

       18
       -
       	msg.Decode(bytes)

     

       19
       -
       	assert.Equal(t, uint16(0x8e19), msg.Header.ID)

     

       20
       -
       	assert.Equal(t, true, msg.Header.QR)

     

       21
       -
       	assert.Equal(t, OPCode(0), msg.Header.OPCode)

     

       22
       -
       	assert.Equal(t, false, msg.Header.AA)

     

       23
       -
       	assert.Equal(t, false, msg.Header.TC)

     

       24
       -
       	assert.Equal(t, true, msg.Header.RD)

     

       25
       -
       	assert.Equal(t, true, msg.Header.RA)

     

       26
       -
       	assert.Equal(t, uint8(0), msg.Header.Z)

     

       27
       -
       	assert.Equal(t, RCode(0), msg.Header.RCode)

     

       28
       -
       	assert.Equal(t, uint16(1), msg.Header.QDCount)

     

       29
       -
       	assert.Equal(t, uint16(1), msg.Header.ANCount)

     

       30
       -
       	assert.Equal(t, uint16(0), msg.Header.NSCount)

     

       31
       -
       	assert.Equal(t, uint16(0), msg.Header.ARCount)

     

       32
        
       

     

       33
       -
       	assert.Equal(t, 1, len(msg.Question))

     

       34
       -
       

     

       35
       -
       	question := msg.Question[0]

     

       36
       -
       	assert.Equal(t, "news.ycombinator.com", question.QName)

     

       37
       -
       	assert.Equal(t, DNSType(1), question.QType)

     

       38
       -
       	assert.Equal(t, DNSClass(1), question.QClass)

     

       39
       -
       

     

       40
       -
       	assert.Equal(t, 1, len(msg.Answer))

     

       41
       -
       	answer := msg.Answer[0]

     

       42
       -
       	assert.Equal(t, answer.Name, "news.ycombinator.com")

     

       43
       -
       	assert.Equal(t, DNSType(1), answer.RType)

     

       44
       -
       	assert.Equal(t, DNSClass(1), answer.RClass)

     

       45
       -
       	assert.Equal(t, uint32(1), answer.TTL)

     

       46
       -
       	assert.Equal(t, uint16(4), answer.RDLength)

     

       47
       -
       }

     

       48
       -
       

     

       49
       -
       func TestMessageDecodeWithU14Offset(t *testing.T) {

     

       50
       -
       	bytes := []byte{

     

       51
       -
       		0x0e, 0xc3, 0x80, 0x00, 0x00, 0x01, 0x00, 0x00,

     

       52
       -
       		0x00, 0x0d, 0x00, 0x0e, 0x06, 0x6e, 0x73, 0x2d,

     

       53
       -
       		0x33, 0x37, 0x32, 0x09, 0x61, 0x77, 0x73, 0x64,

     

       54
       -
       		0x6e, 0x73, 0x2d, 0x34, 0x36, 0x03, 0x63, 0x6f,

     

       55
       -
       		0x6d, 0x00, 0x00, 0x01, 0x00, 0x01, 0xc0, 0x1d,

     

       56
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       57
       -
       		0x00, 0x14, 0x01, 0x61, 0x0c, 0x67, 0x74, 0x6c,

     

       58
       -
       		0x64, 0x2d, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72,

     

       59
       -
       		0x73, 0x03, 0x6e, 0x65, 0x74, 0x00, 0xc0, 0x1d,

     

       60
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       61
       -
       		0x00, 0x04, 0x01, 0x62, 0xc0, 0x34, 0xc0, 0x1d,

     

       62
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       63
       -
       		0x00, 0x04, 0x01, 0x63, 0xc0, 0x34, 0xc0, 0x1d,

     

       64
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       65
       -
       		0x00, 0x04, 0x01, 0x64, 0xc0, 0x34, 0xc0, 0x1d,

     

       66
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       67
       -
       		0x00, 0x04, 0x01, 0x65, 0xc0, 0x34, 0xc0, 0x1d,

     

       68
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       69
       -
       		0x00, 0x04, 0x01, 0x66, 0xc0, 0x34, 0xc0, 0x1d,

     

       70
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       71
       -
       		0x00, 0x04, 0x01, 0x67, 0xc0, 0x34, 0xc0, 0x1d,

     

       72
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       73
       -
       		0x00, 0x04, 0x01, 0x68, 0xc0, 0x34, 0xc0, 0x1d,

     

       74
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       75
       -
       		0x00, 0x04, 0x01, 0x69, 0xc0, 0x34, 0xc0, 0x1d,

     

       76
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       77
       -
       		0x00, 0x04, 0x01, 0x6a, 0xc0, 0x34, 0xc0, 0x1d,

     

       78
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       79
       -
       		0x00, 0x04, 0x01, 0x6b, 0xc0, 0x34, 0xc0, 0x1d,

     

       80
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       81
       -
       		0x00, 0x04, 0x01, 0x6c, 0xc0, 0x34, 0xc0, 0x1d,

     

       82
       -
       		0x00, 0x02, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       83
       -
       		0x00, 0x04, 0x01, 0x6d, 0xc0, 0x34, 0xc0, 0x32,

     

       84
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       85
       -
       		0x00, 0x04, 0xc0, 0x05, 0x06, 0x1e, 0xc0, 0x52,

     

       86
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       87
       -
       		0x00, 0x04, 0xc0, 0x21, 0x0e, 0x1e, 0xc0, 0x62,

     

       88
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       89
       -
       		0x00, 0x04, 0xc0, 0x1a, 0x5c, 0x1e, 0xc0, 0x72,

     

       90
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       91
       -
       		0x00, 0x04, 0xc0, 0x1f, 0x50, 0x1e, 0xc0, 0x82,

     

       92
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       93
       -
       		0x00, 0x04, 0xc0, 0x0c, 0x5e, 0x1e, 0xc0, 0x92,

     

       94
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       95
       -
       		0x00, 0x04, 0xc0, 0x23, 0x33, 0x1e, 0xc0, 0xa2,

     

       96
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       97
       -
       		0x00, 0x04, 0xc0, 0x2a, 0x5d, 0x1e, 0xc0, 0xb2,

     

       98
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       99
       -
       		0x00, 0x04, 0xc0, 0x36, 0x70, 0x1e, 0xc0, 0xc2,

     

       100
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       101
       -
       		0x00, 0x04, 0xc0, 0x2b, 0xac, 0x1e, 0xc0, 0xd2,

     

       102
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       103
       -
       		0x00, 0x04, 0xc0, 0x30, 0x4f, 0x1e, 0xc0, 0xe2,

     

       104
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       105
       -
       		0x00, 0x04, 0xc0, 0x34, 0xb2, 0x1e, 0xc0, 0xf2,

     

       106
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       107
       -
       		0x00, 0x04, 0xc0, 0x29, 0xa2, 0x1e, 0xc1, 0x02,

     

       108
       -
       		0x00, 0x01, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       109
       -
       		0x00, 0x04, 0xc0, 0x37, 0x53, 0x1e, 0xc0, 0x32,

     

       110
       -
       		0x00, 0x1c, 0x00, 0x01, 0x00, 0x02, 0xa3, 0x00,

     

       111
       -
       		0x00, 0x10, 0x20, 0x01, 0x05, 0x03, 0xa8, 0x3e,

     

       112
       -
       		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,

     

       113
       -
       		0x00, 0x30,

     

       114
        
       	}

     

       115
       -
       

     

       116
       -
       	var msg Message

     

       117
       -
       	_ = msg.Decode(bytes)

     

       118
       -
       	// assert_no_error(t, err)

     

       119
       -
       

     

       120
       -
       	// Header Section

     

       121
       -
       	assert.Equal(t, uint16(0x0ec3), msg.Header.ID)

     

       122
       -
       	assert.Equal(t, true, msg.Header.QR)

     

       123
       -
       	assert.Equal(t, QUERY, msg.Header.OPCode)

     

       124
       -
       	assert.Equal(t, false, msg.Header.AA)

     

       125
       -
       	assert.Equal(t, false, msg.Header.TC)

     

       126
       -
       	assert.Equal(t, false, msg.Header.RD)

     

       127
       -
       	assert.Equal(t, false, msg.Header.RA)

     

       128
       -
       	assert.Equal(t, uint8(0), msg.Header.Z)

     

       129
       -
       	assert.Equal(t, NOERROR, msg.Header.RCode)

     

       130
       -
       	assert.Equal(t, uint16(1), msg.Header.QDCount)

     

       131
       -
       	assert.Equal(t, uint16(0), msg.Header.ANCount)

     

       132
       -
       	assert.Equal(t, uint16(13), msg.Header.NSCount)

     

       133
       -
       	assert.Equal(t, uint16(14), msg.Header.ARCount)

     

       134
       -
       

     

       135
       -
       	// Query Section

     

       136
       -
       	assert.Equal(t, 1, len(msg.Question))

     

       137
       -
       	question := msg.Question[0]

     

       138
       -
       	assert.Equal(t, "ns-372.awsdns-46.com", question.QName)

     

       139
       -
       	assert.Equal(t, AType, question.QType)

     

       140
       -
       	assert.Equal(t, IN, question.QClass)

     

       141
       -
       

     

       142
       -
       	assert.Equal(t, 13, len(msg.Authority))

     

       143
       -
       	assert.Equal(t, 14, len(msg.Additional))

     

       144
       -
       }

     

       145
       -
       

     

       146
       -
       func TestMessageEncode(t *testing.T) {

     

       147
       -
       	bytes := []byte{

     

       148
       -
       		0x8e, 0x19, 0x81, 0x80, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x04, 0x6e, 0x65,

     

       149
       -
       		0x77, 0x73, 0x0b, 0x79, 0x63, 0x6f, 0x6d, 0x62, 0x69, 0x6e, 0x61, 0x74, 0x6f, 0x72, 0x03,

     

       150
       -
       		0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01, 0xc0, 0x0c, 0x00, 0x01, 0x00, 0x01, 0x00,

     

       151
       -
       		0x00, 0x00, 0x01, 0x00, 0x04, 0xd1, 0xd8, 0xe6, 0xcf,

     

       152
       -
       	}

     

       153
       -
       

     

       154
       -
       	var msg Message

     

       155
       -
       	err := msg.Decode(bytes)

     

       156
       -
       	assert.NoError(t, err)

     

       157
       -
       

     

       158
       -
       	actual := msg.Encode()

     

       159
       -
       	assert.Equal(t, bytes, actual)

     

       160
       -
       }

     

       161
       -
       

     

       162
       -
       func TestMessageEncode2(t *testing.T) {

     

       163
       -
       	bytes := []byte{

     

       164
       -
       		0xfc, 0xa9, 0x81, 0x80, 0x00, 0x01, 0x00, 0x05,

     

       165
       -
       		0x00, 0x00, 0x00, 0x00, 0x03, 0x6f, 0x6c, 0x64,

     

       166
       -
       		0x06, 0x72, 0x65, 0x64, 0x64, 0x69, 0x74, 0x03,

     

       167
       -
       		0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01,

     

       168
       -
       		0xc0, 0x0c, 0x00, 0x05, 0x00, 0x01, 0x00, 0x00,

     

       169
       -
       		0x2a, 0x17, 0x00, 0x17, 0x06, 0x72, 0x65, 0x64,

     

       170
       -
       		0x64, 0x69, 0x74, 0x03, 0x6d, 0x61, 0x70, 0x06,

     

       171
       -
       		0x66, 0x61, 0x73, 0x74, 0x6c, 0x79, 0x03, 0x6e,

     

       172
       -
       		0x65, 0x74, 0x00, 0xc0, 0x2c, 0x00, 0x01, 0x00,

     

       173
       -
       		0x01, 0x00, 0x00, 0x00, 0x23, 0x00, 0x04, 0x97,

     

       174
       -
       		0x65, 0x01, 0x8c, 0xc0, 0x2c, 0x00, 0x01, 0x00,

     

       175
       -
       		0x01, 0x00, 0x00, 0x00, 0x23, 0x00, 0x04, 0x97,

     

       176
       -
       		0x65, 0xc1, 0x8c, 0xc0, 0x2c, 0x00, 0x01, 0x00,

     

       177
       -
       		0x01, 0x00, 0x00, 0x00, 0x23, 0x00, 0x04, 0x97,

     

       178
       -
       		0x65, 0x41, 0x8c, 0xc0, 0x2c, 0x00, 0x01, 0x00,

     

       179
       -
       		0x01, 0x00, 0x00, 0x00, 0x23, 0x00, 0x04, 0x97,

     

       180
       -
       		0x65, 0x81, 0x8c,

     

       181
       -
       	}

     

       182
       -
       

     

       183
       -
       	var msg Message

     

       184
       -
       	err := msg.Decode(bytes)

     

       185
       -
       	assert.NoError(t, err)

     

       186
       -
       

     

       187
       -
       	actual := msg.Encode()

     

       188
       -
       	assert.Equal(t, bytes, actual)

     

       189
        
       }

     

       190
        
       

     

       191
        
       func FuzzDecodeMessage(f *testing.F) {

     
···

       198
        
       		},

     

       199
        
       	}

     

       200
        
       	for _, tc := range testcases {

     

       201
       -
       		f.Add(tc) // Use f.Add to provide a seed corpus

     

       202
        
       	}

     

       203
        
       	f.Fuzz(func(t *testing.T, msg []byte) {

     

       204
        
       		var m Message

···

       1
        
       package magna

     

       2
        
       

     

       3
        
       import (

     

       4
       +
       	"bytes"

     

       5
       +
       	"encoding/binary"

     

       6
       +
       	"net"

     

       7
        
       	"testing"

     

       8
        
       

     

       9
        
       	"github.com/stretchr/testify/assert"

     

       10
        
       )

     

       11
        
       

     

       12
        
       func TestMessageDecode(t *testing.T) {

     

       13
       +
       	tests := []struct {

     

       14
       +
       		name     string

     

       15
       +
       		input    []byte

     

       16
       +
       		expected Message

     

       17
       +
       		wantErr  bool

     

       18
       +
       	}{

     

       19
       +
       		{

     

       20
       +
       			name: "Valid DNS message with one question",

     

       21
       +
       			input: func() []byte {

     

       22
       +
       				buf := new(bytes.Buffer)

     

       23
       +
       				binary.Write(buf, binary.BigEndian, uint16(1234))

     

       24
       +
       				binary.Write(buf, binary.BigEndian, uint16(0x0100))

     

       25
       +
       				binary.Write(buf, binary.BigEndian, uint16(1))

     

       26
       +
       				binary.Write(buf, binary.BigEndian, uint16(0))

     

       27
       +
       				binary.Write(buf, binary.BigEndian, uint16(0))

     

       28
       +
       				binary.Write(buf, binary.BigEndian, uint16(0))

     

       29
       +
       				buf.Write([]byte{3, 'w', 'w', 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0})

     

       30
       +
       				binary.Write(buf, binary.BigEndian, uint16(1))

     

       31
       +
       				binary.Write(buf, binary.BigEndian, uint16(1))

     

       32
       +
       				return buf.Bytes()

     

       33
       +
       			}(),

     

       34
       +
       			expected: Message{

     

       35
       +
       				Header: Header{

     

       36
       +
       					ID:      1234,

     

       37
       +
       					QR:      false,

     

       38
       +
       					RD:      true,

     

       39
       +
       					OPCode:  0,

     

       40
       +
       					QDCount: 1,

     

       41
       +
       				},

     

       42
       +
       				Question: []Question{

     

       43
       +
       					{

     

       44
       +
       						QName:  "www.example.com",

     

       45
       +
       						QType:  1,

     

       46
       +
       						QClass: 1,

     

       47
       +
       					},

     

       48
       +
       				},

     

       49
       +
       			},

     

       50
       +
       			wantErr: false,

     

       51
       +
       		},

     

       52
       +
       		{

     

       53
       +
       			name: "Valid DNS message with one answer",

     

       54
       +
       			input: func() []byte {

     

       55
       +
       				buf := new(bytes.Buffer)

     

       56
       +
       				binary.Write(buf, binary.BigEndian, uint16(5678))

     

       57
       +
       				binary.Write(buf, binary.BigEndian, uint16(0x8180))

     

       58
       +
       				binary.Write(buf, binary.BigEndian, uint16(0))

     

       59
       +
       				binary.Write(buf, binary.BigEndian, uint16(1))

     

       60
       +
       				binary.Write(buf, binary.BigEndian, uint16(0))

     

       61
       +
       				binary.Write(buf, binary.BigEndian, uint16(0))

     

       62
       +
       				buf.Write([]byte{3, 'w', 'w', 'w', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0})

     

       63
       +
       				binary.Write(buf, binary.BigEndian, uint16(1))

     

       64
       +
       				binary.Write(buf, binary.BigEndian, uint16(1))

     

       65
       +
       				binary.Write(buf, binary.BigEndian, uint32(3600))

     

       66
       +
       				binary.Write(buf, binary.BigEndian, uint16(4))

     

       67
       +
       				binary.Write(buf, binary.BigEndian, uint32(0x0A000001))

     

       68
       +
       				return buf.Bytes()

     

       69
       +
       			}(),

     

       70
       +
       			expected: Message{

     

       71
       +
       				Header: Header{

     

       72
       +
       					ID:      5678,

     

       73
       +
       					QR:      true,

     

       74
       +
       					OPCode:  0,

     

       75
       +
       					AA:      false,

     

       76
       +
       					RD:      true,

     

       77
       +
       					RA:      true,

     

       78
       +
       					RCode:   0,

     

       79
       +
       					ANCount: 1,

     

       80
       +
       				},

     

       81
       +
       				Answer: []ResourceRecord{

     

       82
       +
       					{

     

       83
       +
       						Name:     "www.example.com",

     

       84
       +
       						RType:    1,

     

       85
       +
       						RClass:   1,

     

       86
       +
       						TTL:      3600,

     

       87
       +
       						RDLength: 4,

     

       88
       +
       						RData:    &A{net.IP([]byte{10, 0, 0, 1})},

     

       89
       +
       					},

     

       90
       +
       				},

     

       91
       +
       			},

     

       92
       +
       			wantErr: false,

     

       93
       +
       		},

     

       94
       +
       		{

     

       95
       +
       			name:    "Invalid input - empty buffer",

     

       96
       +
       			input:   []byte{},

     

       97
       +
       			wantErr: true,

     

       98
       +
       		},

     

       99
        
       	}

     

       100
        
       

     

       101
       +
       	for _, tt := range tests {

     

       102
       +
       		t.Run(tt.name, func(t *testing.T) {

     

       103
       +
       			m := &Message{}

     

       104
       +
       			err := m.Decode(tt.input)

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       105
        
       

     

       106
       +
       			if tt.wantErr {

     

       107
       +
       				assert.Error(t, err)

     

       108
       +
       			} else {

     

       109
       +
       				assert.NoError(t, err)

     

       110
       +
       				assert.Equal(t, tt.expected.Header, m.Header)

     

       111
       +
       				assert.Equal(t, tt.expected.Question, m.Question)

     

       112
       +
       				assert.Equal(t, tt.expected.Answer, m.Answer)

     

       113
       +
       				assert.Equal(t, tt.expected.Authority, m.Authority)

     

       114
       +
       				assert.Equal(t, tt.expected.Additional, m.Additional)

     

       115
       +
       			}

     

       116
       +
       		})

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       117
        
       	}

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       118
        
       }

     

       119
        
       

     

       120
        
       func FuzzDecodeMessage(f *testing.F) {

     
···

       127
        
       		},

     

       128
        
       	}

     

       129
        
       	for _, tc := range testcases {

     

       130
       +
       		f.Add(tc)

     

       131
        
       	}

     

       132
        
       	f.Fuzz(func(t *testing.T, msg []byte) {

     

       133
        
       		var m Message

+240

question_test.go

···

       1
       +
       package magna

     

       2
       +
       

     

       3
       +
       import (

     

       4
       +
       	"testing"

     

       5
       +
       

     

       6
       +
       	"github.com/stretchr/testify/assert"

     

       7
       +
       )

     

       8
       +
       

     

       9
       +
       func TestQuestionDecode(t *testing.T) {

     

       10
       +
       	tests := []struct {

     

       11
       +
       		name           string

     

       12
       +
       		input          []byte

     

       13
       +
       		expectedOffset int

     

       14
       +
       		expected       Question

     

       15
       +
       		expectedErr    error

     

       16
       +
       	}{

     

       17
       +
       		{

     

       18
       +
       			name:           "Valid question - example.com A IN",

     

       19
       +
       			input:          []byte{7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0, 0, 1, 0, 1},

     

       20
       +
       			expectedOffset: 17,

     

       21
       +
       			expected: Question{

     

       22
       +
       				QName:  "example.com",

     

       23
       +
       				QType:  DNSType(1),

     

       24
       +
       				QClass: DNSClass(1),

     

       25
       +
       			},

     

       26
       +
       			expectedErr: nil,

     

       27
       +
       		},

     

       28
       +
       		{

     

       29
       +
       			name:           "Valid question - example.com MX CH",

     

       30
       +
       			input:          []byte{7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0, 0, 15, 0, 3},

     

       31
       +
       			expectedOffset: 17,

     

       32
       +
       			expected: Question{

     

       33
       +
       				QName:  "example.com",

     

       34
       +
       				QType:  DNSType(15),

     

       35
       +
       				QClass: DNSClass(3),

     

       36
       +
       			},

     

       37
       +
       			expectedErr: nil,

     

       38
       +
       		},

     

       39
       +
       		{

     

       40
       +
       			name:           "Invalid domain name",

     

       41
       +
       			input:          []byte{255, 'i', 'n', 'v', 'a', 'l', 'i', 'd', 0, 0, 1, 0, 1},

     

       42
       +
       			expectedOffset: 13,

     

       43
       +
       			expected:       Question{},

     

       44
       +
       			expectedErr:    &BufferOverflowError{},

     

       45
       +
       		},

     

       46
       +
       		{

     

       47
       +
       			name:           "Insufficient buffer for QType",

     

       48
       +
       			input:          []byte{7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0, 0},

     

       49
       +
       			expectedOffset: 14,

     

       50
       +
       			expected:       Question{QName: "example.com"},

     

       51
       +
       			expectedErr:    &BufferOverflowError{},

     

       52
       +
       		},

     

       53
       +
       		{

     

       54
       +
       			name:           "Insufficient buffer for QClass",

     

       55
       +
       			input:          []byte{7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0, 0, 1, 0},

     

       56
       +
       			expectedOffset: 16,

     

       57
       +
       			expected:       Question{QName: "example.com", QType: DNSType(1)},

     

       58
       +
       			expectedErr:    &BufferOverflowError{},

     

       59
       +
       		},

     

       60
       +
       	}

     

       61
       +
       

     

       62
       +
       	for _, tt := range tests {

     

       63
       +
       		t.Run(tt.name, func(t *testing.T) {

     

       64
       +
       			q := &Question{}

     

       65
       +
       			offset, err := q.Decode(tt.input, 0)

     

       66
       +
       

     

       67
       +
       			assert.Equal(t, tt.expectedOffset, offset)

     

       68
       +
       

     

       69
       +
       			if tt.expectedErr != nil {

     

       70
       +
       				assert.Error(t, err)

     

       71
       +
       				assert.IsType(t, tt.expectedErr, err)

     

       72
       +
       			} else {

     

       73
       +
       				assert.NoError(t, err)

     

       74
       +
       				assert.Equal(t, tt.expected, *q)

     

       75
       +
       			}

     

       76
       +
       		})

     

       77
       +
       	}

     

       78
       +
       }

     

       79
       +
       

     

       80
       +
       func TestQuestionEncode(t *testing.T) {

     

       81
       +
       	tests := []struct {

     

       82
       +
       		name     string

     

       83
       +
       		question Question

     

       84
       +
       		offsets  map[string]uint16

     

       85
       +
       		expected []byte

     

       86
       +
       	}{

     

       87
       +
       		{

     

       88
       +
       			name: "Simple domain - example.com A IN",

     

       89
       +
       			question: Question{

     

       90
       +
       				QName:  "example.com",

     

       91
       +
       				QType:  DNSType(1),

     

       92
       +
       				QClass: DNSClass(1),

     

       93
       +
       			},

     

       94
       +
       			offsets:  make(map[string]uint16),

     

       95
       +
       			expected: []byte{7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0, 0, 1, 0, 1},

     

       96
       +
       		},

     

       97
       +
       		{

     

       98
       +
       			name: "Subdomain - subdomain.example.com AAAA IN",

     

       99
       +
       			question: Question{

     

       100
       +
       				QName:  "subdomain.example.com",

     

       101
       +
       				QType:  DNSType(28),

     

       102
       +
       				QClass: DNSClass(1),

     

       103
       +
       			},

     

       104
       +
       			offsets:  make(map[string]uint16),

     

       105
       +
       			expected: []byte{9, 's', 'u', 'b', 'd', 'o', 'm', 'a', 'i', 'n', 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0, 0, 28, 0, 1},

     

       106
       +
       		},

     

       107
       +
       		{

     

       108
       +
       			name: "Different class - example.com MX CH",

     

       109
       +
       			question: Question{

     

       110
       +
       				QName:  "example.com",

     

       111
       +
       				QType:  DNSType(15),

     

       112
       +
       				QClass: DNSClass(3),

     

       113
       +
       			},

     

       114
       +
       			offsets:  make(map[string]uint16),

     

       115
       +
       			expected: []byte{7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0, 0, 15, 0, 3},

     

       116
       +
       		},

     

       117
       +
       		{

     

       118
       +
       			name: "Domain compression - example.com after subdomain.example.com",

     

       119
       +
       			question: Question{

     

       120
       +
       				QName:  "example.com",

     

       121
       +
       				QType:  DNSType(1),

     

       122
       +
       				QClass: DNSClass(1),

     

       123
       +
       			},

     

       124
       +
       			offsets: map[string]uint16{

     

       125
       +
       				"com":         22,

     

       126
       +
       				"example.com": 19,

     

       127
       +
       			},

     

       128
       +
       			expected: []byte{0xC0, 0x13, 0x00, 0x01, 0x00, 0x01},

     

       129
       +
       		},

     

       130
       +
       	}

     

       131
       +
       

     

       132
       +
       	for _, tt := range tests {

     

       133
       +
       		t.Run(tt.name, func(t *testing.T) {

     

       134
       +
       			result := tt.question.Encode(nil, &tt.offsets)

     

       135
       +
       			assert.Equal(t, tt.expected, result)

     

       136
       +
       

     

       137
       +
       			if len(tt.offsets) == 0 {

     

       138
       +
       				expectedOffsets := map[string]uint16{

     

       139
       +
       					tt.question.QName: 0,

     

       140
       +
       				}

     

       141
       +
       				for i := 0; i < len(tt.question.QName); i++ {

     

       142
       +
       					if tt.question.QName[i] == '.' {

     

       143
       +
       						expectedOffsets[tt.question.QName[i+1:]] = uint16(i + 1)

     

       144
       +
       					}

     

       145
       +
       				}

     

       146
       +
       				assert.Equal(t, expectedOffsets, tt.offsets)

     

       147
       +
       			}

     

       148
       +
       		})

     

       149
       +
       	}

     

       150
       +
       }

     

       151
       +
       

     

       152
       +
       func TestQuestionEncodeDecodeRoundTrip(t *testing.T) {

     

       153
       +
       	tests := []struct {

     

       154
       +
       		name     string

     

       155
       +
       		question Question

     

       156
       +
       	}{

     

       157
       +
       		{

     

       158
       +
       			name: "Simple domain - example.com A IN",

     

       159
       +
       			question: Question{

     

       160
       +
       				QName:  "example.com",

     

       161
       +
       				QType:  DNSType(1),

     

       162
       +
       				QClass: DNSClass(1),

     

       163
       +
       			},

     

       164
       +
       		},

     

       165
       +
       		{

     

       166
       +
       			name: "Subdomain - subdomain.example.com AAAA IN",

     

       167
       +
       			question: Question{

     

       168
       +
       				QName:  "subdomain.example.com",

     

       169
       +
       				QType:  DNSType(28),

     

       170
       +
       				QClass: DNSClass(1),

     

       171
       +
       			},

     

       172
       +
       		},

     

       173
       +
       		{

     

       174
       +
       			name: "Different class - example.com MX CH",

     

       175
       +
       			question: Question{

     

       176
       +
       				QName:  "example.com",

     

       177
       +
       				QType:  DNSType(15),

     

       178
       +
       				QClass: DNSClass(3),

     

       179
       +
       			},

     

       180
       +
       		},

     

       181
       +
       	}

     

       182
       +
       

     

       183
       +
       	for _, tt := range tests {

     

       184
       +
       		t.Run(tt.name, func(t *testing.T) {

     

       185
       +
       			offsets := make(map[string]uint16)

     

       186
       +
       			encoded := tt.question.Encode(nil, &offsets)

     

       187
       +
       

     

       188
       +
       			decodedQuestion := &Question{}

     

       189
       +
       			_, err := decodedQuestion.Decode(encoded, 0)

     

       190
       +
       

     

       191
       +
       			assert.NoError(t, err)

     

       192
       +
       			assert.Equal(t, tt.question, *decodedQuestion)

     

       193
       +
       		})

     

       194
       +
       	}

     

       195
       +
       }

     

       196
       +
       

     

       197
       +
       func TestQuestionEncodeWithExistingBuffer(t *testing.T) {

     

       198
       +
       	question := Question{

     

       199
       +
       		QName:  "example.com",

     

       200
       +
       		QType:  DNSType(1),

     

       201
       +
       		QClass: DNSClass(1),

     

       202
       +
       	}

     

       203
       +
       

     

       204
       +
       	existingBuffer := []byte{0xFF, 0xFF, 0xFF, 0xFF}

     

       205
       +
       	offsets := make(map[string]uint16)

     

       206
       +
       

     

       207
       +
       	result := question.Encode(existingBuffer, &offsets)

     

       208
       +
       

     

       209
       +
       	expected := append(

     

       210
       +
       		existingBuffer,

     

       211
       +
       		[]byte{7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 3, 'c', 'o', 'm', 0, 0, 1, 0, 1}...,

     

       212
       +
       	)

     

       213
       +
       

     

       214
       +
       	assert.Equal(t, expected, result)

     

       215
       +
       }

     

       216
       +
       

     

       217
       +
       func TestQuestionEncodeLongDomainName(t *testing.T) {

     

       218
       +
       	longLabel := make([]byte, 63)

     

       219
       +
       	for i := range longLabel {

     

       220
       +
       		longLabel[i] = 'a'

     

       221
       +
       	}

     

       222
       +
       	longDomainName := string(longLabel) + "." + string(longLabel) + "." + string(longLabel) + "." + string(longLabel[:61])

     

       223
       +
       

     

       224
       +
       	question := Question{

     

       225
       +
       		QName:  longDomainName,

     

       226
       +
       		QType:  DNSType(1),

     

       227
       +
       		QClass: DNSClass(1),

     

       228
       +
       	}

     

       229
       +
       

     

       230
       +
       	offsets := make(map[string]uint16)

     

       231
       +
       	encoded := question.Encode(nil, &offsets)

     

       232
       +
       

     

       233
       +
       	assert.Equal(t, 259, len(encoded))

     

       234
       +
       

     

       235
       +
       	decodedQuestion := &Question{}

     

       236
       +
       	_, err := decodedQuestion.Decode(encoded, 0)

     

       237
       +
       

     

       238
       +
       	assert.NoError(t, err)

     

       239
       +
       	assert.Equal(t, question, *decodedQuestion)

     

       240
       +
       }