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Diffstat (limited to 'vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/msg_helpers.go')
-rw-r--r--vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/msg_helpers.go633
1 files changed, 0 insertions, 633 deletions
diff --git a/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/msg_helpers.go b/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/msg_helpers.go
deleted file mode 100644
index 615274ab0..000000000
--- a/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/msg_helpers.go
+++ /dev/null
@@ -1,633 +0,0 @@
-package dns
-
-import (
- "encoding/base32"
- "encoding/base64"
- "encoding/binary"
- "encoding/hex"
- "net"
- "strconv"
-)
-
-// helper functions called from the generated zmsg.go
-
-// These function are named after the tag to help pack/unpack, if there is no tag it is the name
-// of the type they pack/unpack (string, int, etc). We prefix all with unpackData or packData, so packDataA or
-// packDataDomainName.
-
-func unpackDataA(msg []byte, off int) (net.IP, int, error) {
- if off+net.IPv4len > len(msg) {
- return nil, len(msg), &Error{err: "overflow unpacking a"}
- }
- a := append(make(net.IP, 0, net.IPv4len), msg[off:off+net.IPv4len]...)
- off += net.IPv4len
- return a, off, nil
-}
-
-func packDataA(a net.IP, msg []byte, off int) (int, error) {
- // It must be a slice of 4, even if it is 16, we encode only the first 4
- if off+net.IPv4len > len(msg) {
- return len(msg), &Error{err: "overflow packing a"}
- }
- switch len(a) {
- case net.IPv4len, net.IPv6len:
- copy(msg[off:], a.To4())
- off += net.IPv4len
- case 0:
- // Allowed, for dynamic updates.
- default:
- return len(msg), &Error{err: "overflow packing a"}
- }
- return off, nil
-}
-
-func unpackDataAAAA(msg []byte, off int) (net.IP, int, error) {
- if off+net.IPv6len > len(msg) {
- return nil, len(msg), &Error{err: "overflow unpacking aaaa"}
- }
- aaaa := append(make(net.IP, 0, net.IPv6len), msg[off:off+net.IPv6len]...)
- off += net.IPv6len
- return aaaa, off, nil
-}
-
-func packDataAAAA(aaaa net.IP, msg []byte, off int) (int, error) {
- if off+net.IPv6len > len(msg) {
- return len(msg), &Error{err: "overflow packing aaaa"}
- }
-
- switch len(aaaa) {
- case net.IPv6len:
- copy(msg[off:], aaaa)
- off += net.IPv6len
- case 0:
- // Allowed, dynamic updates.
- default:
- return len(msg), &Error{err: "overflow packing aaaa"}
- }
- return off, nil
-}
-
-// unpackHeader unpacks an RR header, returning the offset to the end of the header and a
-// re-sliced msg according to the expected length of the RR.
-func unpackHeader(msg []byte, off int) (rr RR_Header, off1 int, truncmsg []byte, err error) {
- hdr := RR_Header{}
- if off == len(msg) {
- return hdr, off, msg, nil
- }
-
- hdr.Name, off, err = UnpackDomainName(msg, off)
- if err != nil {
- return hdr, len(msg), msg, err
- }
- hdr.Rrtype, off, err = unpackUint16(msg, off)
- if err != nil {
- return hdr, len(msg), msg, err
- }
- hdr.Class, off, err = unpackUint16(msg, off)
- if err != nil {
- return hdr, len(msg), msg, err
- }
- hdr.Ttl, off, err = unpackUint32(msg, off)
- if err != nil {
- return hdr, len(msg), msg, err
- }
- hdr.Rdlength, off, err = unpackUint16(msg, off)
- if err != nil {
- return hdr, len(msg), msg, err
- }
- msg, err = truncateMsgFromRdlength(msg, off, hdr.Rdlength)
- return hdr, off, msg, nil
-}
-
-// pack packs an RR header, returning the offset to the end of the header.
-// See PackDomainName for documentation about the compression.
-func (hdr RR_Header) pack(msg []byte, off int, compression map[string]int, compress bool) (off1 int, err error) {
- if off == len(msg) {
- return off, nil
- }
-
- off, err = PackDomainName(hdr.Name, msg, off, compression, compress)
- if err != nil {
- return len(msg), err
- }
- off, err = packUint16(hdr.Rrtype, msg, off)
- if err != nil {
- return len(msg), err
- }
- off, err = packUint16(hdr.Class, msg, off)
- if err != nil {
- return len(msg), err
- }
- off, err = packUint32(hdr.Ttl, msg, off)
- if err != nil {
- return len(msg), err
- }
- off, err = packUint16(hdr.Rdlength, msg, off)
- if err != nil {
- return len(msg), err
- }
- return off, nil
-}
-
-// helper helper functions.
-
-// truncateMsgFromRdLength truncates msg to match the expected length of the RR.
-// Returns an error if msg is smaller than the expected size.
-func truncateMsgFromRdlength(msg []byte, off int, rdlength uint16) (truncmsg []byte, err error) {
- lenrd := off + int(rdlength)
- if lenrd > len(msg) {
- return msg, &Error{err: "overflowing header size"}
- }
- return msg[:lenrd], nil
-}
-
-func fromBase32(s []byte) (buf []byte, err error) {
- for i, b := range s {
- if b >= 'a' && b <= 'z' {
- s[i] = b - 32
- }
- }
- buflen := base32.HexEncoding.DecodedLen(len(s))
- buf = make([]byte, buflen)
- n, err := base32.HexEncoding.Decode(buf, s)
- buf = buf[:n]
- return
-}
-
-func toBase32(b []byte) string { return base32.HexEncoding.EncodeToString(b) }
-
-func fromBase64(s []byte) (buf []byte, err error) {
- buflen := base64.StdEncoding.DecodedLen(len(s))
- buf = make([]byte, buflen)
- n, err := base64.StdEncoding.Decode(buf, s)
- buf = buf[:n]
- return
-}
-
-func toBase64(b []byte) string { return base64.StdEncoding.EncodeToString(b) }
-
-// dynamicUpdate returns true if the Rdlength is zero.
-func noRdata(h RR_Header) bool { return h.Rdlength == 0 }
-
-func unpackUint8(msg []byte, off int) (i uint8, off1 int, err error) {
- if off+1 > len(msg) {
- return 0, len(msg), &Error{err: "overflow unpacking uint8"}
- }
- return uint8(msg[off]), off + 1, nil
-}
-
-func packUint8(i uint8, msg []byte, off int) (off1 int, err error) {
- if off+1 > len(msg) {
- return len(msg), &Error{err: "overflow packing uint8"}
- }
- msg[off] = byte(i)
- return off + 1, nil
-}
-
-func unpackUint16(msg []byte, off int) (i uint16, off1 int, err error) {
- if off+2 > len(msg) {
- return 0, len(msg), &Error{err: "overflow unpacking uint16"}
- }
- return binary.BigEndian.Uint16(msg[off:]), off + 2, nil
-}
-
-func packUint16(i uint16, msg []byte, off int) (off1 int, err error) {
- if off+2 > len(msg) {
- return len(msg), &Error{err: "overflow packing uint16"}
- }
- binary.BigEndian.PutUint16(msg[off:], i)
- return off + 2, nil
-}
-
-func unpackUint32(msg []byte, off int) (i uint32, off1 int, err error) {
- if off+4 > len(msg) {
- return 0, len(msg), &Error{err: "overflow unpacking uint32"}
- }
- return binary.BigEndian.Uint32(msg[off:]), off + 4, nil
-}
-
-func packUint32(i uint32, msg []byte, off int) (off1 int, err error) {
- if off+4 > len(msg) {
- return len(msg), &Error{err: "overflow packing uint32"}
- }
- binary.BigEndian.PutUint32(msg[off:], i)
- return off + 4, nil
-}
-
-func unpackUint48(msg []byte, off int) (i uint64, off1 int, err error) {
- if off+6 > len(msg) {
- return 0, len(msg), &Error{err: "overflow unpacking uint64 as uint48"}
- }
- // Used in TSIG where the last 48 bits are occupied, so for now, assume a uint48 (6 bytes)
- i = (uint64(uint64(msg[off])<<40 | uint64(msg[off+1])<<32 | uint64(msg[off+2])<<24 | uint64(msg[off+3])<<16 |
- uint64(msg[off+4])<<8 | uint64(msg[off+5])))
- off += 6
- return i, off, nil
-}
-
-func packUint48(i uint64, msg []byte, off int) (off1 int, err error) {
- if off+6 > len(msg) {
- return len(msg), &Error{err: "overflow packing uint64 as uint48"}
- }
- msg[off] = byte(i >> 40)
- msg[off+1] = byte(i >> 32)
- msg[off+2] = byte(i >> 24)
- msg[off+3] = byte(i >> 16)
- msg[off+4] = byte(i >> 8)
- msg[off+5] = byte(i)
- off += 6
- return off, nil
-}
-
-func unpackUint64(msg []byte, off int) (i uint64, off1 int, err error) {
- if off+8 > len(msg) {
- return 0, len(msg), &Error{err: "overflow unpacking uint64"}
- }
- return binary.BigEndian.Uint64(msg[off:]), off + 8, nil
-}
-
-func packUint64(i uint64, msg []byte, off int) (off1 int, err error) {
- if off+8 > len(msg) {
- return len(msg), &Error{err: "overflow packing uint64"}
- }
- binary.BigEndian.PutUint64(msg[off:], i)
- off += 8
- return off, nil
-}
-
-func unpackString(msg []byte, off int) (string, int, error) {
- if off+1 > len(msg) {
- return "", off, &Error{err: "overflow unpacking txt"}
- }
- l := int(msg[off])
- if off+l+1 > len(msg) {
- return "", off, &Error{err: "overflow unpacking txt"}
- }
- s := make([]byte, 0, l)
- for _, b := range msg[off+1 : off+1+l] {
- switch b {
- case '"', '\\':
- s = append(s, '\\', b)
- default:
- if b < 32 || b > 127 { // unprintable
- var buf [3]byte
- bufs := strconv.AppendInt(buf[:0], int64(b), 10)
- s = append(s, '\\')
- for i := 0; i < 3-len(bufs); i++ {
- s = append(s, '0')
- }
- for _, r := range bufs {
- s = append(s, r)
- }
- } else {
- s = append(s, b)
- }
- }
- }
- off += 1 + l
- return string(s), off, nil
-}
-
-func packString(s string, msg []byte, off int) (int, error) {
- txtTmp := make([]byte, 256*4+1)
- off, err := packTxtString(s, msg, off, txtTmp)
- if err != nil {
- return len(msg), err
- }
- return off, nil
-}
-
-func unpackStringBase32(msg []byte, off, end int) (string, int, error) {
- if end > len(msg) {
- return "", len(msg), &Error{err: "overflow unpacking base32"}
- }
- s := toBase32(msg[off:end])
- return s, end, nil
-}
-
-func packStringBase32(s string, msg []byte, off int) (int, error) {
- b32, err := fromBase32([]byte(s))
- if err != nil {
- return len(msg), err
- }
- if off+len(b32) > len(msg) {
- return len(msg), &Error{err: "overflow packing base32"}
- }
- copy(msg[off:off+len(b32)], b32)
- off += len(b32)
- return off, nil
-}
-
-func unpackStringBase64(msg []byte, off, end int) (string, int, error) {
- // Rest of the RR is base64 encoded value, so we don't need an explicit length
- // to be set. Thus far all RR's that have base64 encoded fields have those as their
- // last one. What we do need is the end of the RR!
- if end > len(msg) {
- return "", len(msg), &Error{err: "overflow unpacking base64"}
- }
- s := toBase64(msg[off:end])
- return s, end, nil
-}
-
-func packStringBase64(s string, msg []byte, off int) (int, error) {
- b64, err := fromBase64([]byte(s))
- if err != nil {
- return len(msg), err
- }
- if off+len(b64) > len(msg) {
- return len(msg), &Error{err: "overflow packing base64"}
- }
- copy(msg[off:off+len(b64)], b64)
- off += len(b64)
- return off, nil
-}
-
-func unpackStringHex(msg []byte, off, end int) (string, int, error) {
- // Rest of the RR is hex encoded value, so we don't need an explicit length
- // to be set. NSEC and TSIG have hex fields with a length field.
- // What we do need is the end of the RR!
- if end > len(msg) {
- return "", len(msg), &Error{err: "overflow unpacking hex"}
- }
-
- s := hex.EncodeToString(msg[off:end])
- return s, end, nil
-}
-
-func packStringHex(s string, msg []byte, off int) (int, error) {
- h, err := hex.DecodeString(s)
- if err != nil {
- return len(msg), err
- }
- if off+(len(h)) > len(msg) {
- return len(msg), &Error{err: "overflow packing hex"}
- }
- copy(msg[off:off+len(h)], h)
- off += len(h)
- return off, nil
-}
-
-func unpackStringTxt(msg []byte, off int) ([]string, int, error) {
- txt, off, err := unpackTxt(msg, off)
- if err != nil {
- return nil, len(msg), err
- }
- return txt, off, nil
-}
-
-func packStringTxt(s []string, msg []byte, off int) (int, error) {
- txtTmp := make([]byte, 256*4+1) // If the whole string consists out of \DDD we need this many.
- off, err := packTxt(s, msg, off, txtTmp)
- if err != nil {
- return len(msg), err
- }
- return off, nil
-}
-
-func unpackDataOpt(msg []byte, off int) ([]EDNS0, int, error) {
- var edns []EDNS0
-Option:
- code := uint16(0)
- if off+4 > len(msg) {
- return nil, len(msg), &Error{err: "overflow unpacking opt"}
- }
- code = binary.BigEndian.Uint16(msg[off:])
- off += 2
- optlen := binary.BigEndian.Uint16(msg[off:])
- off += 2
- if off+int(optlen) > len(msg) {
- return nil, len(msg), &Error{err: "overflow unpacking opt"}
- }
- switch code {
- case EDNS0NSID:
- e := new(EDNS0_NSID)
- if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
- return nil, len(msg), err
- }
- edns = append(edns, e)
- off += int(optlen)
- case EDNS0SUBNET, EDNS0SUBNETDRAFT:
- e := new(EDNS0_SUBNET)
- if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
- return nil, len(msg), err
- }
- edns = append(edns, e)
- off += int(optlen)
- if code == EDNS0SUBNETDRAFT {
- e.DraftOption = true
- }
- case EDNS0COOKIE:
- e := new(EDNS0_COOKIE)
- if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
- return nil, len(msg), err
- }
- edns = append(edns, e)
- off += int(optlen)
- case EDNS0UL:
- e := new(EDNS0_UL)
- if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
- return nil, len(msg), err
- }
- edns = append(edns, e)
- off += int(optlen)
- case EDNS0LLQ:
- e := new(EDNS0_LLQ)
- if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
- return nil, len(msg), err
- }
- edns = append(edns, e)
- off += int(optlen)
- case EDNS0DAU:
- e := new(EDNS0_DAU)
- if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
- return nil, len(msg), err
- }
- edns = append(edns, e)
- off += int(optlen)
- case EDNS0DHU:
- e := new(EDNS0_DHU)
- if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
- return nil, len(msg), err
- }
- edns = append(edns, e)
- off += int(optlen)
- case EDNS0N3U:
- e := new(EDNS0_N3U)
- if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
- return nil, len(msg), err
- }
- edns = append(edns, e)
- off += int(optlen)
- default:
- e := new(EDNS0_LOCAL)
- e.Code = code
- if err := e.unpack(msg[off : off+int(optlen)]); err != nil {
- return nil, len(msg), err
- }
- edns = append(edns, e)
- off += int(optlen)
- }
-
- if off < len(msg) {
- goto Option
- }
-
- return edns, off, nil
-}
-
-func packDataOpt(options []EDNS0, msg []byte, off int) (int, error) {
- for _, el := range options {
- b, err := el.pack()
- if err != nil || off+3 > len(msg) {
- return len(msg), &Error{err: "overflow packing opt"}
- }
- binary.BigEndian.PutUint16(msg[off:], el.Option()) // Option code
- binary.BigEndian.PutUint16(msg[off+2:], uint16(len(b))) // Length
- off += 4
- if off+len(b) > len(msg) {
- copy(msg[off:], b)
- off = len(msg)
- continue
- }
- // Actual data
- copy(msg[off:off+len(b)], b)
- off += len(b)
- }
- return off, nil
-}
-
-func unpackStringOctet(msg []byte, off int) (string, int, error) {
- s := string(msg[off:])
- return s, len(msg), nil
-}
-
-func packStringOctet(s string, msg []byte, off int) (int, error) {
- txtTmp := make([]byte, 256*4+1)
- off, err := packOctetString(s, msg, off, txtTmp)
- if err != nil {
- return len(msg), err
- }
- return off, nil
-}
-
-func unpackDataNsec(msg []byte, off int) ([]uint16, int, error) {
- var nsec []uint16
- length, window, lastwindow := 0, 0, -1
- for off < len(msg) {
- if off+2 > len(msg) {
- return nsec, len(msg), &Error{err: "overflow unpacking nsecx"}
- }
- window = int(msg[off])
- length = int(msg[off+1])
- off += 2
- if window <= lastwindow {
- // RFC 4034: Blocks are present in the NSEC RR RDATA in
- // increasing numerical order.
- return nsec, len(msg), &Error{err: "out of order NSEC block"}
- }
- if length == 0 {
- // RFC 4034: Blocks with no types present MUST NOT be included.
- return nsec, len(msg), &Error{err: "empty NSEC block"}
- }
- if length > 32 {
- return nsec, len(msg), &Error{err: "NSEC block too long"}
- }
- if off+length > len(msg) {
- return nsec, len(msg), &Error{err: "overflowing NSEC block"}
- }
-
- // Walk the bytes in the window and extract the type bits
- for j := 0; j < length; j++ {
- b := msg[off+j]
- // Check the bits one by one, and set the type
- if b&0x80 == 0x80 {
- nsec = append(nsec, uint16(window*256+j*8+0))
- }
- if b&0x40 == 0x40 {
- nsec = append(nsec, uint16(window*256+j*8+1))
- }
- if b&0x20 == 0x20 {
- nsec = append(nsec, uint16(window*256+j*8+2))
- }
- if b&0x10 == 0x10 {
- nsec = append(nsec, uint16(window*256+j*8+3))
- }
- if b&0x8 == 0x8 {
- nsec = append(nsec, uint16(window*256+j*8+4))
- }
- if b&0x4 == 0x4 {
- nsec = append(nsec, uint16(window*256+j*8+5))
- }
- if b&0x2 == 0x2 {
- nsec = append(nsec, uint16(window*256+j*8+6))
- }
- if b&0x1 == 0x1 {
- nsec = append(nsec, uint16(window*256+j*8+7))
- }
- }
- off += length
- lastwindow = window
- }
- return nsec, off, nil
-}
-
-func packDataNsec(bitmap []uint16, msg []byte, off int) (int, error) {
- if len(bitmap) == 0 {
- return off, nil
- }
- var lastwindow, lastlength uint16
- for j := 0; j < len(bitmap); j++ {
- t := bitmap[j]
- window := t / 256
- length := (t-window*256)/8 + 1
- if window > lastwindow && lastlength != 0 { // New window, jump to the new offset
- off += int(lastlength) + 2
- lastlength = 0
- }
- if window < lastwindow || length < lastlength {
- return len(msg), &Error{err: "nsec bits out of order"}
- }
- if off+2+int(length) > len(msg) {
- return len(msg), &Error{err: "overflow packing nsec"}
- }
- // Setting the window #
- msg[off] = byte(window)
- // Setting the octets length
- msg[off+1] = byte(length)
- // Setting the bit value for the type in the right octet
- msg[off+1+int(length)] |= byte(1 << (7 - (t % 8)))
- lastwindow, lastlength = window, length
- }
- off += int(lastlength) + 2
- return off, nil
-}
-
-func unpackDataDomainNames(msg []byte, off, end int) ([]string, int, error) {
- var (
- servers []string
- s string
- err error
- )
- if end > len(msg) {
- return nil, len(msg), &Error{err: "overflow unpacking domain names"}
- }
- for off < end {
- s, off, err = UnpackDomainName(msg, off)
- if err != nil {
- return servers, len(msg), err
- }
- servers = append(servers, s)
- }
- return servers, off, nil
-}
-
-func packDataDomainNames(names []string, msg []byte, off int, compression map[string]int, compress bool) (int, error) {
- var err error
- for j := 0; j < len(names); j++ {
- off, err = PackDomainName(names[j], msg, off, compression, false && compress)
- if err != nil {
- return len(msg), err
- }
- }
- return off, nil
-}
generated by cgit v1.2.3-1-g7c22 (git 2.25.1) at 2024-05-20 13:37:45 +0000