mirror of
https://github.com/DNSCrypt/dnscrypt-proxy.git
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Bump miekg/dns
This commit is contained in:
Frank Denis
parent
9c8c327703
commit
c367a82ac0
75 changed files with 3243 additions and 253 deletions
250
vendor/github.com/miekg/dns/svcb.go
generated
vendored
250
vendor/github.com/miekg/dns/svcb.go
generated
vendored
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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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@ -22,6 +23,7 @@ const (
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SVCB_IPV4HINT
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SVCB_ECHCONFIG
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SVCB_IPV6HINT
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SVCB_DOHPATH // draft-ietf-add-svcb-dns-02 Section 9
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svcb_RESERVED SVCBKey = 65535
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)
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@ -34,6 +36,7 @@ var svcbKeyToStringMap = map[SVCBKey]string{
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SVCB_IPV4HINT: "ipv4hint",
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SVCB_ECHCONFIG: "ech",
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SVCB_IPV6HINT: "ipv6hint",
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SVCB_DOHPATH: "dohpath",
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}
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var svcbStringToKeyMap = reverseSVCBKeyMap(svcbKeyToStringMap)
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@ -196,6 +199,8 @@ func makeSVCBKeyValue(key SVCBKey) SVCBKeyValue {
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return new(SVCBECHConfig)
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case SVCB_IPV6HINT:
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return new(SVCBIPv6Hint)
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case SVCB_DOHPATH:
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return new(SVCBDoHPath)
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case svcb_RESERVED:
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return nil
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default:
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@ -206,6 +211,10 @@ func makeSVCBKeyValue(key SVCBKey) SVCBKeyValue {
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}
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// SVCB RR. See RFC xxxx (https://tools.ietf.org/html/draft-ietf-dnsop-svcb-https-08).
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//
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// NOTE: The HTTPS/SVCB RFCs are in the draft stage.
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// The API, including constants and types related to SVCBKeyValues, may
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// change in future versions in accordance with the latest drafts.
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type SVCB struct {
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Hdr RR_Header
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Priority uint16 // If zero, Value must be empty or discarded by the user of this library
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@ -215,6 +224,10 @@ type SVCB struct {
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// HTTPS RR. Everything valid for SVCB applies to HTTPS as well.
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// Except that the HTTPS record is intended for use with the HTTP and HTTPS protocols.
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//
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// NOTE: The HTTPS/SVCB RFCs are in the draft stage.
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// The API, including constants and types related to SVCBKeyValues, may
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// change in future versions in accordance with the latest drafts.
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type HTTPS struct {
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SVCB
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}
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@ -330,13 +343,57 @@ func (s *SVCBMandatory) copy() SVCBKeyValue {
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// h.Hdr = dns.RR_Header{Name: ".", Rrtype: dns.TypeHTTPS, Class: dns.ClassINET}
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// e := new(dns.SVCBAlpn)
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// e.Alpn = []string{"h2", "http/1.1"}
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// h.Value = append(o.Value, e)
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// h.Value = append(h.Value, e)
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type SVCBAlpn struct {
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Alpn []string
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}
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func (*SVCBAlpn) Key() SVCBKey { return SVCB_ALPN }
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func (s *SVCBAlpn) String() string { return strings.Join(s.Alpn, ",") }
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func (*SVCBAlpn) Key() SVCBKey { return SVCB_ALPN }
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func (s *SVCBAlpn) String() string {
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// An ALPN value is a comma-separated list of values, each of which can be
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// an arbitrary binary value. In order to allow parsing, the comma and
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// backslash characters are themselves excaped.
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//
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// However, this escaping is done in addition to the normal escaping which
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// happens in zone files, meaning that these values must be
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// double-escaped. This looks terrible, so if you see a never-ending
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// sequence of backslash in a zone file this may be why.
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//
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// https://datatracker.ietf.org/doc/html/draft-ietf-dnsop-svcb-https-08#appendix-A.1
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var str strings.Builder
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for i, alpn := range s.Alpn {
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// 4*len(alpn) is the worst case where we escape every character in the alpn as \123, plus 1 byte for the ',' separating the alpn from others
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str.Grow(4*len(alpn) + 1)
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if i > 0 {
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str.WriteByte(',')
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}
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for j := 0; j < len(alpn); j++ {
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e := alpn[j]
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if ' ' > e || e > '~' {
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str.WriteString(escapeByte(e))
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continue
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}
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switch e {
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// We escape a few characters which may confuse humans or parsers.
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case '"', ';', ' ':
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str.WriteByte('\\')
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str.WriteByte(e)
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// The comma and backslash characters themselves must be
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// doubly-escaped. We use `\\` for the first backslash and
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// the escaped numeric value for the other value. We especially
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// don't want a comma in the output.
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case ',':
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str.WriteString(`\\\044`)
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case '\\':
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str.WriteString(`\\\092`)
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default:
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str.WriteByte(e)
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}
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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 *SVCBAlpn) pack() ([]byte, error) {
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// Liberally estimate the size of an alpn as 10 octets
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@ -371,7 +428,47 @@ func (s *SVCBAlpn) unpack(b []byte) error {
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}
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func (s *SVCBAlpn) parse(b string) error {
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s.Alpn = strings.Split(b, ",")
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if len(b) == 0 {
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s.Alpn = []string{}
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return nil
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}
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alpn := []string{}
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a := []byte{}
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for p := 0; p < len(b); {
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c, q := nextByte(b, p)
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if q == 0 {
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return errors.New("dns: svcbalpn: unterminated escape")
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}
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p += q
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// If we find a comma, we have finished reading an alpn.
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if c == ',' {
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if len(a) == 0 {
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return errors.New("dns: svcbalpn: empty protocol identifier")
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}
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alpn = append(alpn, string(a))
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a = []byte{}
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continue
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}
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// If it's a backslash, we need to handle a comma-separated list.
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if c == '\\' {
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dc, dq := nextByte(b, p)
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if dq == 0 {
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return errors.New("dns: svcbalpn: unterminated escape decoding comma-separated list")
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}
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if dc != '\\' && dc != ',' {
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return errors.New("dns: svcbalpn: bad escaped character decoding comma-separated list")
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}
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p += dq
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c = dc
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}
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a = append(a, c)
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}
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// Add the final alpn.
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if len(a) == 0 {
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return errors.New("dns: svcbalpn: last protocol identifier empty")
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}
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s.Alpn = append(alpn, string(a))
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return nil
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}
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@ -669,6 +766,54 @@ func (s *SVCBIPv6Hint) copy() SVCBKeyValue {
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}
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}
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// SVCBDoHPath pair is used to indicate the URI template that the
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// clients may use to construct a DNS over HTTPS URI.
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//
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// See RFC xxxx (https://datatracker.ietf.org/doc/html/draft-ietf-add-svcb-dns-02)
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// and RFC yyyy (https://datatracker.ietf.org/doc/html/draft-ietf-add-ddr-06).
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//
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// A basic example of using the dohpath option together with the alpn
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// option to indicate support for DNS over HTTPS on a certain path:
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//
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// s := new(dns.SVCB)
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// s.Hdr = dns.RR_Header{Name: ".", Rrtype: dns.TypeSVCB, Class: dns.ClassINET}
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// e := new(dns.SVCBAlpn)
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// e.Alpn = []string{"h2", "h3"}
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// p := new(dns.SVCBDoHPath)
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// p.Template = "/dns-query{?dns}"
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// s.Value = append(s.Value, e, p)
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//
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// The parsing currently doesn't validate that Template is a valid
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// RFC 6570 URI template.
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type SVCBDoHPath struct {
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Template string
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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 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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func (s *SVCBDoHPath) unpack(b []byte) error {
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s.Template = string(b)
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return nil
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}
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func (s *SVCBDoHPath) parse(b string) error {
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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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func (s *SVCBDoHPath) copy() SVCBKeyValue {
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return &SVCBDoHPath{
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Template: s.Template,
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}
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}
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// SVCBLocal pair is intended for experimental/private use. The key is recommended
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// to be in the range [SVCB_PRIVATE_LOWER, SVCB_PRIVATE_UPPER].
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// Basic use pattern for creating a keyNNNNN option:
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@ -685,6 +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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@ -693,50 +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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@ -777,3 +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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