forked from ShangjinTang/clash-core
/
websocket.go
319 lines (275 loc) · 6.96 KB
/
websocket.go
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package vmess
import (
"bytes"
"context"
"crypto/tls"
"encoding/base64"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"time"
"github.com/gorilla/websocket"
)
type websocketConn struct {
conn *websocket.Conn
reader io.Reader
remoteAddr net.Addr
// https://godoc.org/github.com/gorilla/websocket#hdr-Concurrency
rMux sync.Mutex
wMux sync.Mutex
}
type websocketWithEarlyDataConn struct {
net.Conn
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
}
// 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) Close() error {
var errors []string
if err := wsc.conn.WriteControl(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""), time.Now().Add(time.Second*5)); err != nil {
errors = append(errors, err.Error())
}
if err := wsc.conn.Close(); err != nil {
errors = append(errors, err.Error())
}
if len(errors) > 0 {
return fmt.Errorf("failed to close connection: %s", strings.Join(errors, ","))
}
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 errors.New("failed to encode early data: " + err.Error())
}
if errc := base64EarlyDataEncoder.Close(); errc != nil {
return errors.New("failed to encode early data tail: " + errc.Error())
}
var err error
if wsedc.Conn, err = streamWebsocketConn(wsedc.underlay, wsedc.config, base64DataBuf); err != nil {
wsedc.Close()
return errors.New("failed to dial WebSocket: " + err.Error())
}
wsedc.dialed <- true
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) 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 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,
}
return conn, nil
}
func streamWebsocketConn(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
}
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.Dial(uri.String(), headers)
if err != nil {
reason := err.Error()
if resp != nil {
reason = resp.Status
}
return nil, fmt.Errorf("dial %s error: %s", uri.Host, reason)
}
return &websocketConn{
conn: wsConn,
remoteAddr: conn.RemoteAddr(),
}, nil
}
func StreamWebsocketConn(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(conn, c, nil)
}