You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

422 lines
8.2 KiB
Go

package mysql
import (
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/sha256"
"encoding/binary"
"fmt"
"io"
mrand "math/rand"
"runtime"
"strings"
"time"
"github.com/Masterminds/semver"
"github.com/pingcap/errors"
"github.com/siddontang/go/hack"
)
func Pstack() string {
buf := make([]byte, 1024)
n := runtime.Stack(buf, false)
return string(buf[0:n])
}
func CalcPassword(scramble, password []byte) []byte {
if len(password) == 0 {
return nil
}
// stage1Hash = SHA1(password)
crypt := sha1.New()
crypt.Write(password)
stage1 := crypt.Sum(nil)
// scrambleHash = SHA1(scramble + SHA1(stage1Hash))
// inner Hash
crypt.Reset()
crypt.Write(stage1)
hash := crypt.Sum(nil)
// outer Hash
crypt.Reset()
crypt.Write(scramble)
crypt.Write(hash)
scramble = crypt.Sum(nil)
// token = scrambleHash XOR stage1Hash
for i := range scramble {
scramble[i] ^= stage1[i]
}
return scramble
}
// CalcCachingSha2Password: Hash password using MySQL 8+ method (SHA256)
func CalcCachingSha2Password(scramble []byte, password string) []byte {
if len(password) == 0 {
return nil
}
// XOR(SHA256(password), SHA256(SHA256(SHA256(password)), scramble))
crypt := sha256.New()
crypt.Write([]byte(password))
message1 := crypt.Sum(nil)
crypt.Reset()
crypt.Write(message1)
message1Hash := crypt.Sum(nil)
crypt.Reset()
crypt.Write(message1Hash)
crypt.Write(scramble)
message2 := crypt.Sum(nil)
for i := range message1 {
message1[i] ^= message2[i]
}
return message1
}
func EncryptPassword(password string, seed []byte, pub *rsa.PublicKey) ([]byte, error) {
plain := make([]byte, len(password)+1)
copy(plain, password)
for i := range plain {
j := i % len(seed)
plain[i] ^= seed[j]
}
sha1v := sha1.New()
return rsa.EncryptOAEP(sha1v, rand.Reader, pub, plain, nil)
}
// AppendLengthEncodedInteger: encodes a uint64 value and appends it to the given bytes slice
func AppendLengthEncodedInteger(b []byte, n uint64) []byte {
switch {
case n <= 250:
return append(b, byte(n))
case n <= 0xffff:
return append(b, 0xfc, byte(n), byte(n>>8))
case n <= 0xffffff:
return append(b, 0xfd, byte(n), byte(n>>8), byte(n>>16))
}
return append(b, 0xfe, byte(n), byte(n>>8), byte(n>>16), byte(n>>24),
byte(n>>32), byte(n>>40), byte(n>>48), byte(n>>56))
}
func RandomBuf(size int) []byte {
buf := make([]byte, size)
mrand.Seed(time.Now().UTC().UnixNano())
min, max := 30, 127
for i := 0; i < size; i++ {
buf[i] = byte(min + mrand.Intn(max-min))
}
return buf
}
// FixedLengthInt: little endian
func FixedLengthInt(buf []byte) uint64 {
var num uint64 = 0
for i, b := range buf {
num |= uint64(b) << (uint(i) * 8)
}
return num
}
// BFixedLengthInt: big endian
func BFixedLengthInt(buf []byte) uint64 {
var num uint64 = 0
for i, b := range buf {
num |= uint64(b) << (uint(len(buf)-i-1) * 8)
}
return num
}
func LengthEncodedInt(b []byte) (num uint64, isNull bool, n int) {
if len(b) == 0 {
return 0, true, 0
}
switch b[0] {
// 251: NULL
case 0xfb:
return 0, true, 1
// 252: value of following 2
case 0xfc:
return uint64(b[1]) | uint64(b[2])<<8, false, 3
// 253: value of following 3
case 0xfd:
return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16, false, 4
// 254: value of following 8
case 0xfe:
return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16 |
uint64(b[4])<<24 | uint64(b[5])<<32 | uint64(b[6])<<40 |
uint64(b[7])<<48 | uint64(b[8])<<56,
false, 9
}
// 0-250: value of first byte
return uint64(b[0]), false, 1
}
func PutLengthEncodedInt(n uint64) []byte {
switch {
case n <= 250:
return []byte{byte(n)}
case n <= 0xffff:
return []byte{0xfc, byte(n), byte(n >> 8)}
case n <= 0xffffff:
return []byte{0xfd, byte(n), byte(n >> 8), byte(n >> 16)}
case n <= 0xffffffffffffffff:
return []byte{0xfe, byte(n), byte(n >> 8), byte(n >> 16), byte(n >> 24),
byte(n >> 32), byte(n >> 40), byte(n >> 48), byte(n >> 56)}
}
return nil
}
// LengthEncodedString returns the string read as a bytes slice, whether the value is NULL,
// the number of bytes read and an error, in case the string is longer than
// the input slice
func LengthEncodedString(b []byte) ([]byte, bool, int, error) {
// Get length
num, isNull, n := LengthEncodedInt(b)
if num < 1 {
return b[n:n], isNull, n, nil
}
n += int(num)
// Check data length
if len(b) >= n {
return b[n-int(num) : n : n], false, n, nil
}
return nil, false, n, io.EOF
}
func SkipLengthEncodedString(b []byte) (int, error) {
// Get length
num, _, n := LengthEncodedInt(b)
if num < 1 {
return n, nil
}
n += int(num)
// Check data length
if len(b) >= n {
return n, nil
}
return n, io.EOF
}
func PutLengthEncodedString(b []byte) []byte {
data := make([]byte, 0, len(b)+9)
data = append(data, PutLengthEncodedInt(uint64(len(b)))...)
data = append(data, b...)
return data
}
func Uint16ToBytes(n uint16) []byte {
return []byte{
byte(n),
byte(n >> 8),
}
}
func Uint32ToBytes(n uint32) []byte {
return []byte{
byte(n),
byte(n >> 8),
byte(n >> 16),
byte(n >> 24),
}
}
func Uint64ToBytes(n uint64) []byte {
return []byte{
byte(n),
byte(n >> 8),
byte(n >> 16),
byte(n >> 24),
byte(n >> 32),
byte(n >> 40),
byte(n >> 48),
byte(n >> 56),
}
}
func FormatBinaryDate(n int, data []byte) ([]byte, error) {
switch n {
case 0:
return []byte("0000-00-00"), nil
case 4:
return []byte(fmt.Sprintf("%04d-%02d-%02d",
binary.LittleEndian.Uint16(data[:2]),
data[2],
data[3])), nil
default:
return nil, errors.Errorf("invalid date packet length %d", n)
}
}
func FormatBinaryDateTime(n int, data []byte) ([]byte, error) {
switch n {
case 0:
return []byte("0000-00-00 00:00:00"), nil
case 4:
return []byte(fmt.Sprintf("%04d-%02d-%02d 00:00:00",
binary.LittleEndian.Uint16(data[:2]),
data[2],
data[3])), nil
case 7:
return []byte(fmt.Sprintf(
"%04d-%02d-%02d %02d:%02d:%02d",
binary.LittleEndian.Uint16(data[:2]),
data[2],
data[3],
data[4],
data[5],
data[6])), nil
case 11:
return []byte(fmt.Sprintf(
"%04d-%02d-%02d %02d:%02d:%02d.%06d",
binary.LittleEndian.Uint16(data[:2]),
data[2],
data[3],
data[4],
data[5],
data[6],
binary.LittleEndian.Uint32(data[7:11]))), nil
default:
return nil, errors.Errorf("invalid datetime packet length %d", n)
}
}
func FormatBinaryTime(n int, data []byte) ([]byte, error) {
if n == 0 {
return []byte("0000-00-00"), nil
}
var sign byte
if data[0] == 1 {
sign = byte('-')
}
switch n {
case 8:
return []byte(fmt.Sprintf(
"%c%02d:%02d:%02d",
sign,
uint16(data[1])*24+uint16(data[5]),
data[6],
data[7],
)), nil
case 12:
return []byte(fmt.Sprintf(
"%c%02d:%02d:%02d.%06d",
sign,
uint16(data[1])*24+uint16(data[5]),
data[6],
data[7],
binary.LittleEndian.Uint32(data[8:12]),
)), nil
default:
return nil, errors.Errorf("invalid time packet length %d", n)
}
}
var (
DONTESCAPE = byte(255)
EncodeMap [256]byte
)
// Escape: only support utf-8
func Escape(sql string) string {
dest := make([]byte, 0, 2*len(sql))
for _, w := range hack.Slice(sql) {
if c := EncodeMap[w]; c == DONTESCAPE {
dest = append(dest, w)
} else {
dest = append(dest, '\\', c)
}
}
return string(dest)
}
func GetNetProto(addr string) string {
if strings.Contains(addr, "/") {
return "unix"
} else {
return "tcp"
}
}
// ErrorEqual returns a boolean indicating whether err1 is equal to err2.
func ErrorEqual(err1, err2 error) bool {
e1 := errors.Cause(err1)
e2 := errors.Cause(err2)
if e1 == e2 {
return true
}
if e1 == nil || e2 == nil {
return e1 == e2
}
return e1.Error() == e2.Error()
}
func CompareServerVersions(a, b string) (int, error) {
var (
aVer, bVer *semver.Version
err error
)
if aVer, err = semver.NewVersion(a); err != nil {
return 0, fmt.Errorf("cannot parse %q as semver: %w", a, err)
}
if bVer, err = semver.NewVersion(b); err != nil {
return 0, fmt.Errorf("cannot parse %q as semver: %w", b, err)
}
return aVer.Compare(bVer), nil
}
var encodeRef = map[byte]byte{
'\x00': '0',
'\'': '\'',
'"': '"',
'\b': 'b',
'\n': 'n',
'\r': 'r',
'\t': 't',
26: 'Z', // ctl-Z
'\\': '\\',
}
func init() {
for i := range EncodeMap {
EncodeMap[i] = DONTESCAPE
}
for i := range EncodeMap {
if to, ok := encodeRef[byte(i)]; ok {
EncodeMap[byte(i)] = to
}
}
}