mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-09-10 22:14:23 -04:00
117 lines
2.4 KiB
Go
117 lines
2.4 KiB
Go
package io
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import (
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"hash"
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"hash/fnv"
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"io"
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"v2ray.com/core/common/alloc"
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"v2ray.com/core/common/errors"
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"v2ray.com/core/common/serial"
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)
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// Private: Visible for testing.
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type Validator struct {
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actualAuth hash.Hash32
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expectedAuth uint32
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}
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func NewValidator(expectedAuth uint32) *Validator {
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return &Validator{
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actualAuth: fnv.New32a(),
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expectedAuth: expectedAuth,
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}
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}
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func (v *Validator) Consume(b []byte) {
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v.actualAuth.Write(b)
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}
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func (v *Validator) Validate() bool {
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return v.actualAuth.Sum32() == v.expectedAuth
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}
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type AuthChunkReader struct {
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reader io.Reader
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last *alloc.Buffer
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chunkLength int
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validator *Validator
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}
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func NewAuthChunkReader(reader io.Reader) *AuthChunkReader {
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return &AuthChunkReader{
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reader: reader,
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chunkLength: -1,
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}
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}
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func (v *AuthChunkReader) Read() (*alloc.Buffer, error) {
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var buffer *alloc.Buffer
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if v.last != nil {
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buffer = v.last
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v.last = nil
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} else {
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buffer = alloc.NewBuffer().Clear()
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}
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if v.chunkLength == -1 {
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for buffer.Len() < 6 {
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_, err := buffer.FillFrom(v.reader)
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if err != nil {
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buffer.Release()
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return nil, io.ErrUnexpectedEOF
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}
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}
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length := serial.BytesToUint16(buffer.Value[:2])
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v.chunkLength = int(length) - 4
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v.validator = NewValidator(serial.BytesToUint32(buffer.Value[2:6]))
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buffer.SliceFrom(6)
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if buffer.Len() < v.chunkLength && v.chunkLength <= 2048 {
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_, err := buffer.FillFrom(v.reader)
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if err != nil {
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buffer.Release()
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return nil, io.ErrUnexpectedEOF
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}
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}
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} else if buffer.Len() < v.chunkLength {
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_, err := buffer.FillFrom(v.reader)
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if err != nil {
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buffer.Release()
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return nil, io.ErrUnexpectedEOF
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}
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}
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if v.chunkLength == 0 {
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buffer.Release()
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return nil, io.EOF
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}
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if buffer.Len() < v.chunkLength {
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v.validator.Consume(buffer.Value)
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v.chunkLength -= buffer.Len()
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} else {
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v.validator.Consume(buffer.Value[:v.chunkLength])
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if !v.validator.Validate() {
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buffer.Release()
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return nil, errors.New("VMess|AuthChunkReader: Invalid auth.")
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}
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leftLength := buffer.Len() - v.chunkLength
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if leftLength > 0 {
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v.last = alloc.NewBuffer().Clear()
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v.last.Append(buffer.Value[v.chunkLength:])
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buffer.Slice(0, v.chunkLength)
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}
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v.chunkLength = -1
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v.validator = nil
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}
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return buffer, nil
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}
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func (v *AuthChunkReader) Release() {
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v.reader = nil
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v.last.Release()
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v.last = nil
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v.validator = nil
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}
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