mirror of https://github.com/v2ray/v2ray-core
123 lines
2.9 KiB
Go
123 lines
2.9 KiB
Go
package io // import "github.com/v2ray/v2ray-core/common/io"
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import (
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"io"
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"github.com/v2ray/v2ray-core/common/alloc"
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"github.com/v2ray/v2ray-core/common/crypto"
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"github.com/v2ray/v2ray-core/common/serial"
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"github.com/v2ray/v2ray-core/transport"
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)
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// ReadFrom reads from a reader and put all content to a buffer.
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// If buffer is nil, ReadFrom creates a new normal buffer.
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func ReadFrom(reader io.Reader, buffer *alloc.Buffer) (*alloc.Buffer, error) {
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if buffer == nil {
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buffer = alloc.NewBuffer()
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}
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nBytes, err := reader.Read(buffer.Value)
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buffer.Slice(0, nBytes)
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return buffer, err
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}
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type Reader interface {
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Read() (*alloc.Buffer, error)
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}
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type AdaptiveReader struct {
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reader io.Reader
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allocate func() *alloc.Buffer
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isLarge bool
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}
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func NewAdaptiveReader(reader io.Reader) *AdaptiveReader {
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return &AdaptiveReader{
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reader: reader,
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allocate: alloc.NewBuffer,
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isLarge: false,
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}
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}
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func (this *AdaptiveReader) Read() (*alloc.Buffer, error) {
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buffer, err := ReadFrom(this.reader, this.allocate())
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if buffer.IsFull() && !this.isLarge {
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this.allocate = alloc.NewLargeBuffer
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this.isLarge = true
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} else if !buffer.IsFull() {
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this.allocate = alloc.NewBuffer
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this.isLarge = false
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}
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if err != nil {
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alloc.Release(buffer)
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return nil, err
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}
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return buffer, nil
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}
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type ChunkReader struct {
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reader io.Reader
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}
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func NewChunkReader(reader io.Reader) *ChunkReader {
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return &ChunkReader{
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reader: reader,
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}
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}
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func (this *ChunkReader) Read() (*alloc.Buffer, error) {
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buffer := alloc.NewLargeBuffer()
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if _, err := io.ReadFull(this.reader, buffer.Value[:2]); err != nil {
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alloc.Release(buffer)
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return nil, err
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}
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length := serial.BytesLiteral(buffer.Value[:2]).Uint16Value()
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if _, err := io.ReadFull(this.reader, buffer.Value[:length]); err != nil {
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alloc.Release(buffer)
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return nil, err
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}
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buffer.Slice(0, int(length))
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return buffer, nil
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}
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type AuthenticationReader struct {
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reader Reader
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authenticator crypto.Authenticator
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authBeforePayload bool
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}
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func NewAuthenticationReader(reader Reader, auth crypto.Authenticator, authBeforePayload bool) *AuthenticationReader {
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return &AuthenticationReader{
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reader: reader,
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authenticator: auth,
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authBeforePayload: authBeforePayload,
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}
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}
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func (this *AuthenticationReader) Read() (*alloc.Buffer, error) {
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buffer, err := this.reader.Read()
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if err != nil {
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alloc.Release(buffer)
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return nil, err
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}
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authSize := this.authenticator.AuthSize()
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var authBytes, payloadBytes []byte
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if this.authBeforePayload {
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authBytes = buffer.Value[:authSize]
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payloadBytes = buffer.Value[authSize:]
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} else {
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payloadBytes = buffer.Value[:authSize]
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authBytes = buffer.Value[authSize:]
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}
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actualAuthBytes := this.authenticator.Authenticate(nil, payloadBytes)
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if !serial.BytesLiteral(authBytes).Equals(serial.BytesLiteral(actualAuthBytes)) {
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alloc.Release(buffer)
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return nil, transport.CorruptedPacket
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}
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buffer.Value = payloadBytes
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return buffer, nil
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}
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