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websocket.go
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websocket.go
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package vmess
import (
"bytes"
"context"
"crypto/tls"
"encoding/base64"
"encoding/binary"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"time"
"github.com/qauzy/aiat/common/buf"
N "github.com/qauzy/aiat/common/net"
tlsC "github.com/qauzy/aiat/component/tls"
"github.com/gorilla/websocket"
"github.com/zhangyunhao116/fastrand"
)
type websocketConn struct {
conn *websocket.Conn
reader io.Reader
remoteAddr net.Addr
rawWriter N.ExtendedWriter
// https://godoc.org/github.com/gorilla/websocket#hdr-Concurrency
rMux sync.Mutex
wMux sync.Mutex
}
type websocketWithEarlyDataConn struct {
net.Conn
wsWriter N.ExtendedWriter
underlay net.Conn
closed bool
dialed chan bool
cancel context.CancelFunc
ctx context.Context
config *WebsocketConfig
}
type WebsocketConfig struct {
Host string
Port string
Path string
Headers http.Header
TLS bool
TLSConfig *tls.Config
MaxEarlyData int
EarlyDataHeaderName string
ClientFingerprint string
}
// Read implements net.Conn.Read()
func (wsc *websocketConn) Read(b []byte) (int, error) {
wsc.rMux.Lock()
defer wsc.rMux.Unlock()
for {
reader, err := wsc.getReader()
if err != nil {
return 0, err
}
nBytes, err := reader.Read(b)
if err == io.EOF {
wsc.reader = nil
continue
}
return nBytes, err
}
}
// Write implements io.Writer.
func (wsc *websocketConn) Write(b []byte) (int, error) {
wsc.wMux.Lock()
defer wsc.wMux.Unlock()
if err := wsc.conn.WriteMessage(websocket.BinaryMessage, b); err != nil {
return 0, err
}
return len(b), nil
}
func (wsc *websocketConn) WriteBuffer(buffer *buf.Buffer) error {
var payloadBitLength int
dataLen := buffer.Len()
data := buffer.Bytes()
if dataLen < 126 {
payloadBitLength = 1
} else if dataLen < 65536 {
payloadBitLength = 3
} else {
payloadBitLength = 9
}
var headerLen int
headerLen += 1 // FIN / RSV / OPCODE
headerLen += payloadBitLength
headerLen += 4 // MASK KEY
header := buffer.ExtendHeader(headerLen)
_ = header[2] // bounds check hint to compiler
header[0] = websocket.BinaryMessage | 1<<7
header[1] = 1 << 7
if dataLen < 126 {
header[1] |= byte(dataLen)
} else if dataLen < 65536 {
header[1] |= 126
binary.BigEndian.PutUint16(header[2:], uint16(dataLen))
} else {
header[1] |= 127
binary.BigEndian.PutUint64(header[2:], uint64(dataLen))
}
maskKey := fastrand.Uint32()
binary.LittleEndian.PutUint32(header[1+payloadBitLength:], maskKey)
N.MaskWebSocket(maskKey, data)
wsc.wMux.Lock()
defer wsc.wMux.Unlock()
return wsc.rawWriter.WriteBuffer(buffer)
}
func (wsc *websocketConn) FrontHeadroom() int {
return 14
}
func (wsc *websocketConn) Upstream() any {
return wsc.conn.UnderlyingConn()
}
func (wsc *websocketConn) Close() error {
var e []string
if err := wsc.conn.WriteControl(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""), time.Now().Add(time.Second*5)); err != nil {
e = append(e, err.Error())
}
if err := wsc.conn.Close(); err != nil {
e = append(e, err.Error())
}
if len(e) > 0 {
return fmt.Errorf("failed to close connection: %s", strings.Join(e, ","))
}
return nil
}
func (wsc *websocketConn) getReader() (io.Reader, error) {
if wsc.reader != nil {
return wsc.reader, nil
}
_, reader, err := wsc.conn.NextReader()
if err != nil {
return nil, err
}
wsc.reader = reader
return reader, nil
}
func (wsc *websocketConn) LocalAddr() net.Addr {
return wsc.conn.LocalAddr()
}
func (wsc *websocketConn) RemoteAddr() net.Addr {
return wsc.remoteAddr
}
func (wsc *websocketConn) SetDeadline(t time.Time) error {
if err := wsc.SetReadDeadline(t); err != nil {
return err
}
return wsc.SetWriteDeadline(t)
}
func (wsc *websocketConn) SetReadDeadline(t time.Time) error {
return wsc.conn.SetReadDeadline(t)
}
func (wsc *websocketConn) SetWriteDeadline(t time.Time) error {
return wsc.conn.SetWriteDeadline(t)
}
func (wsedc *websocketWithEarlyDataConn) Dial(earlyData []byte) error {
base64DataBuf := &bytes.Buffer{}
base64EarlyDataEncoder := base64.NewEncoder(base64.RawURLEncoding, base64DataBuf)
earlyDataBuf := bytes.NewBuffer(earlyData)
if _, err := base64EarlyDataEncoder.Write(earlyDataBuf.Next(wsedc.config.MaxEarlyData)); err != nil {
return fmt.Errorf("failed to encode early data: %w", err)
}
if errc := base64EarlyDataEncoder.Close(); errc != nil {
return fmt.Errorf("failed to encode early data tail: %w", errc)
}
var err error
if wsedc.Conn, err = streamWebsocketConn(wsedc.ctx, wsedc.underlay, wsedc.config, base64DataBuf); err != nil {
wsedc.Close()
return fmt.Errorf("failed to dial WebSocket: %w", err)
}
wsedc.dialed <- true
wsedc.wsWriter = N.NewExtendedWriter(wsedc.Conn)
if earlyDataBuf.Len() != 0 {
_, err = wsedc.Conn.Write(earlyDataBuf.Bytes())
}
return err
}
func (wsedc *websocketWithEarlyDataConn) Write(b []byte) (int, error) {
if wsedc.closed {
return 0, io.ErrClosedPipe
}
if wsedc.Conn == nil {
if err := wsedc.Dial(b); err != nil {
return 0, err
}
return len(b), nil
}
return wsedc.Conn.Write(b)
}
func (wsedc *websocketWithEarlyDataConn) WriteBuffer(buffer *buf.Buffer) error {
if wsedc.closed {
return io.ErrClosedPipe
}
if wsedc.Conn == nil {
if err := wsedc.Dial(buffer.Bytes()); err != nil {
return err
}
return nil
}
return wsedc.wsWriter.WriteBuffer(buffer)
}
func (wsedc *websocketWithEarlyDataConn) Read(b []byte) (int, error) {
if wsedc.closed {
return 0, io.ErrClosedPipe
}
if wsedc.Conn == nil {
select {
case <-wsedc.ctx.Done():
return 0, io.ErrUnexpectedEOF
case <-wsedc.dialed:
}
}
return wsedc.Conn.Read(b)
}
func (wsedc *websocketWithEarlyDataConn) Close() error {
wsedc.closed = true
wsedc.cancel()
if wsedc.Conn == nil {
return nil
}
return wsedc.Conn.Close()
}
func (wsedc *websocketWithEarlyDataConn) LocalAddr() net.Addr {
if wsedc.Conn == nil {
return wsedc.underlay.LocalAddr()
}
return wsedc.Conn.LocalAddr()
}
func (wsedc *websocketWithEarlyDataConn) RemoteAddr() net.Addr {
if wsedc.Conn == nil {
return wsedc.underlay.RemoteAddr()
}
return wsedc.Conn.RemoteAddr()
}
func (wsedc *websocketWithEarlyDataConn) SetDeadline(t time.Time) error {
if err := wsedc.SetReadDeadline(t); err != nil {
return err
}
return wsedc.SetWriteDeadline(t)
}
func (wsedc *websocketWithEarlyDataConn) SetReadDeadline(t time.Time) error {
if wsedc.Conn == nil {
return nil
}
return wsedc.Conn.SetReadDeadline(t)
}
func (wsedc *websocketWithEarlyDataConn) SetWriteDeadline(t time.Time) error {
if wsedc.Conn == nil {
return nil
}
return wsedc.Conn.SetWriteDeadline(t)
}
func (wsedc *websocketWithEarlyDataConn) FrontHeadroom() int {
return 14
}
func (wsedc *websocketWithEarlyDataConn) Upstream() any {
return wsedc.underlay
}
//func (wsedc *websocketWithEarlyDataConn) LazyHeadroom() bool {
// return wsedc.Conn == nil
//}
//
//func (wsedc *websocketWithEarlyDataConn) Upstream() any {
// if wsedc.Conn == nil { // ensure return a nil interface not an interface with nil value
// return nil
// }
// return wsedc.Conn
//}
func (wsedc *websocketWithEarlyDataConn) NeedHandshake() bool {
return wsedc.Conn == nil
}
func streamWebsocketWithEarlyDataConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
ctx, cancel := context.WithCancel(context.Background())
conn = &websocketWithEarlyDataConn{
dialed: make(chan bool, 1),
cancel: cancel,
ctx: ctx,
underlay: conn,
config: c,
}
// websocketWithEarlyDataConn can't correct handle Deadline
// it will not apply the already set Deadline after Dial()
// so call N.NewDeadlineConn to add a safe wrapper
return N.NewDeadlineConn(conn), nil
}
func streamWebsocketConn(ctx context.Context, conn net.Conn, c *WebsocketConfig, earlyData *bytes.Buffer) (net.Conn, error) {
dialer := &websocket.Dialer{
NetDial: func(network, addr string) (net.Conn, error) {
return conn, nil
},
ReadBufferSize: 4 * 1024,
WriteBufferSize: 4 * 1024,
HandshakeTimeout: time.Second * 8,
}
scheme := "ws"
if c.TLS {
scheme = "wss"
dialer.TLSClientConfig = c.TLSConfig
if len(c.ClientFingerprint) != 0 {
if fingerprint, exists := tlsC.GetFingerprint(c.ClientFingerprint); exists {
dialer.NetDialTLSContext = func(_ context.Context, _, addr string) (net.Conn, error) {
utlsConn := tlsC.UClient(conn, c.TLSConfig, fingerprint)
if err := utlsConn.(*tlsC.UConn).WebsocketHandshake(); err != nil {
return nil, fmt.Errorf("parse url %s error: %w", c.Path, err)
}
return utlsConn, nil
}
}
}
}
u, err := url.Parse(c.Path)
if err != nil {
return nil, fmt.Errorf("parse url %s error: %w", c.Path, err)
}
uri := url.URL{
Scheme: scheme,
Host: net.JoinHostPort(c.Host, c.Port),
Path: u.Path,
RawQuery: u.RawQuery,
}
headers := http.Header{}
if c.Headers != nil {
for k := range c.Headers {
headers.Add(k, c.Headers.Get(k))
}
}
if earlyData != nil {
if c.EarlyDataHeaderName == "" {
uri.Path += earlyData.String()
} else {
headers.Set(c.EarlyDataHeaderName, earlyData.String())
}
}
wsConn, resp, err := dialer.DialContext(ctx, uri.String(), headers)
if err != nil {
reason := err
if resp != nil {
reason = errors.New(resp.Status)
}
return nil, fmt.Errorf("dial %s error: %w", uri.Host, reason)
}
conn = &websocketConn{
conn: wsConn,
rawWriter: N.NewExtendedWriter(wsConn.UnderlyingConn()),
remoteAddr: conn.RemoteAddr(),
}
// websocketConn can't correct handle ReadDeadline
// gorilla/websocket will cache the os.ErrDeadlineExceeded from conn.Read()
// it will cause read fail and event panic in *websocket.Conn.NextReader()
// so call N.NewDeadlineConn to add a safe wrapper
return N.NewDeadlineConn(conn), nil
}
func StreamWebsocketConn(ctx context.Context, conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
if u, err := url.Parse(c.Path); err == nil {
if q := u.Query(); q.Get("ed") != "" {
if ed, err := strconv.Atoi(q.Get("ed")); err == nil {
c.MaxEarlyData = ed
c.EarlyDataHeaderName = "Sec-WebSocket-Protocol"
q.Del("ed")
u.RawQuery = q.Encode()
c.Path = u.String()
}
}
}
if c.MaxEarlyData > 0 {
return streamWebsocketWithEarlyDataConn(conn, c)
}
return streamWebsocketConn(ctx, conn, c, nil)
}