diff options
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.go | 633 |
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 -} |