Fix dohpath parsing/stringify (#1366)
* dohpath escaped in String(), and parsed such values * Update the test for dohpath with escaping * Fix cut & paste error with svcdohpath error
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@ -1654,6 +1654,7 @@ func TestParseSVCB(t *testing.T) {
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`example.com. SVCB 16 foo.example.org. alpn=f\\\092oo\092,bar,h2`: `example.com. 3600 IN SVCB 16 foo.example.org. alpn="f\\\092oo\\\044bar,h2"`,
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// From draft-ietf-add-ddr-06
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`_dns.example.net. SVCB 1 example.net. alpn=h2 dohpath=/dns-query{?dns}`: `_dns.example.net. 3600 IN SVCB 1 example.net. alpn="h2" dohpath="/dns-query{?dns}"`,
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`_dns.example.net. SVCB 1 example.net. alpn=h2 dohpath=/dns\045query{\?dns}`: `_dns.example.net. 3600 IN SVCB 1 example.net. alpn="h2" dohpath="/dns-query{?dns}"`,
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}
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for s, o := range svcbs {
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rr, err := NewRR(s)
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106
svcb.go
106
svcb.go
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@ -4,6 +4,7 @@ import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"net"
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"sort"
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"strconv"
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@ -789,7 +790,7 @@ type SVCBDoHPath struct {
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}
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func (*SVCBDoHPath) Key() SVCBKey { return SVCB_DOHPATH }
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func (s *SVCBDoHPath) String() string { return s.Template }
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func (s *SVCBDoHPath) String() string { return svcbParamToStr([]byte(s.Template)) }
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func (s *SVCBDoHPath) len() int { return len(s.Template) }
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func (s *SVCBDoHPath) pack() ([]byte, error) { return []byte(s.Template), nil }
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@ -799,7 +800,11 @@ func (s *SVCBDoHPath) unpack(b []byte) error {
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}
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func (s *SVCBDoHPath) parse(b string) error {
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s.Template = b
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template, err := svcbParseParam(b)
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if err != nil {
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return fmt.Errorf("dns: svcbdohpath: %w", err)
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}
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s.Template = string(template)
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return nil
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}
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@ -825,6 +830,7 @@ type SVCBLocal struct {
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}
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func (s *SVCBLocal) Key() SVCBKey { return s.KeyCode }
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func (s *SVCBLocal) String() string { return svcbParamToStr(s.Data) }
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func (s *SVCBLocal) pack() ([]byte, error) { return append([]byte(nil), s.Data...), nil }
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func (s *SVCBLocal) len() int { return len(s.Data) }
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@ -833,50 +839,10 @@ func (s *SVCBLocal) unpack(b []byte) error {
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return nil
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}
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func (s *SVCBLocal) String() string {
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var str strings.Builder
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str.Grow(4 * len(s.Data))
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for _, e := range s.Data {
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if ' ' <= e && e <= '~' {
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switch e {
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case '"', ';', ' ', '\\':
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str.WriteByte('\\')
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str.WriteByte(e)
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default:
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str.WriteByte(e)
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}
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} else {
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str.WriteString(escapeByte(e))
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}
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}
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return str.String()
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}
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func (s *SVCBLocal) parse(b string) error {
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data := make([]byte, 0, len(b))
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for i := 0; i < len(b); {
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if b[i] != '\\' {
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data = append(data, b[i])
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i++
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continue
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}
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if i+1 == len(b) {
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return errors.New("dns: svcblocal: svcb private/experimental key escape unterminated")
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}
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if isDigit(b[i+1]) {
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if i+3 < len(b) && isDigit(b[i+2]) && isDigit(b[i+3]) {
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a, err := strconv.ParseUint(b[i+1:i+4], 10, 8)
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if err == nil {
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i += 4
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data = append(data, byte(a))
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continue
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}
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}
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return errors.New("dns: svcblocal: svcb private/experimental key bad escaped octet")
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} else {
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data = append(data, b[i+1])
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i += 2
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}
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data, err := svcbParseParam(b)
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if err != nil {
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return fmt.Errorf("dns: svcblocal: svcb private/experimental key %w", err)
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}
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s.Data = data
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return nil
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@ -917,3 +883,53 @@ func areSVCBPairArraysEqual(a []SVCBKeyValue, b []SVCBKeyValue) bool {
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}
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return true
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}
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// svcbParamStr converts the value of an SVCB parameter into a DNS presentation-format string.
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func svcbParamToStr(s []byte) string {
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var str strings.Builder
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str.Grow(4 * len(s))
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for _, e := range s {
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if ' ' <= e && e <= '~' {
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switch e {
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case '"', ';', ' ', '\\':
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str.WriteByte('\\')
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str.WriteByte(e)
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default:
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str.WriteByte(e)
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}
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} else {
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str.WriteString(escapeByte(e))
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}
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}
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return str.String()
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}
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// svcbParseParam parses a DNS presentation-format string into an SVCB parameter value.
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func svcbParseParam(b string) ([]byte, error) {
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data := make([]byte, 0, len(b))
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for i := 0; i < len(b); {
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if b[i] != '\\' {
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data = append(data, b[i])
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i++
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continue
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}
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if i+1 == len(b) {
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return nil, errors.New("escape unterminated")
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}
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if isDigit(b[i+1]) {
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if i+3 < len(b) && isDigit(b[i+2]) && isDigit(b[i+3]) {
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a, err := strconv.ParseUint(b[i+1:i+4], 10, 8)
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if err == nil {
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i += 4
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data = append(data, byte(a))
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continue
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}
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}
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return nil, errors.New("bad escaped octet")
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} else {
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data = append(data, b[i+1])
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i += 2
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}
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}
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return data, nil
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}
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