Xray-core/transport/internet/websocket/dialer.go

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Go
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package websocket
import (
"bytes"
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"context"
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_ "embed"
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"encoding/base64"
"io"
gonet "net"
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"net/http"
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"time"
"github.com/gorilla/websocket"
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"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/platform"
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"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/uuid"
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"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/stat"
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"github.com/xtls/xray-core/transport/internet/tls"
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)
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//go:embed dialer.html
var webpage []byte
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var conns chan *websocket.Conn
func init() {
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addr := platform.NewEnvFlag(platform.BrowserDialerAddress).GetValue(func() string { return "" })
if addr != "" {
token := uuid.New()
csrfToken := token.String()
webpage = bytes.ReplaceAll(webpage, []byte("csrfToken"), []byte(csrfToken))
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conns = make(chan *websocket.Conn, 256)
go http.ListenAndServe(addr, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path == "/websocket" {
if r.URL.Query().Get("token") == csrfToken {
if conn, err := upgrader.Upgrade(w, r, nil); err == nil {
conns <- conn
} else {
newError("Browser dialer http upgrade unexpected error").AtError().WriteToLog()
}
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}
} else {
w.Write(webpage)
}
}))
}
}
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// Dial dials a WebSocket connection to the given destination.
func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (stat.Connection, error) {
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newError("creating connection to ", dest).WriteToLog(session.ExportIDToError(ctx))
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var conn net.Conn
if streamSettings.ProtocolSettings.(*Config).Ed > 0 {
ctx, cancel := context.WithCancel(ctx)
conn = &delayDialConn{
dialed: make(chan bool, 1),
cancel: cancel,
ctx: ctx,
dest: dest,
streamSettings: streamSettings,
}
} else {
var err error
if conn, err = dialWebSocket(ctx, dest, streamSettings, nil); err != nil {
return nil, newError("failed to dial WebSocket").Base(err)
}
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}
return stat.Connection(conn), nil
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}
func init() {
common.Must(internet.RegisterTransportDialer(protocolName, Dial))
}
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func dialWebSocket(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig, ed []byte) (net.Conn, error) {
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wsSettings := streamSettings.ProtocolSettings.(*Config)
dialer := &websocket.Dialer{
NetDial: func(network, addr string) (net.Conn, error) {
return internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
},
ReadBufferSize: 4 * 1024,
WriteBufferSize: 4 * 1024,
HandshakeTimeout: time.Second * 8,
}
protocol := "ws"
if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
protocol = "wss"
tlsConfig := config.GetTLSConfig(tls.WithDestination(dest), tls.WithNextProto("http/1.1"))
dialer.TLSClientConfig = tlsConfig
if fingerprint := tls.GetFingerprint(config.Fingerprint); fingerprint != nil {
dialer.NetDialTLSContext = func(_ context.Context, _, addr string) (gonet.Conn, error) {
// Like the NetDial in the dialer
pconn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
if err != nil {
newError("failed to dial to " + addr).Base(err).AtError().WriteToLog()
return nil, err
}
// TLS and apply the handshake
cn := tls.UClient(pconn, tlsConfig, fingerprint).(*tls.UConn)
if err := cn.WebsocketHandshakeContext(ctx); err != nil {
newError("failed to dial to " + addr).Base(err).AtError().WriteToLog()
return nil, err
}
if !tlsConfig.InsecureSkipVerify {
if err := cn.VerifyHostname(tlsConfig.ServerName); err != nil {
newError("failed to dial to " + addr).Base(err).AtError().WriteToLog()
return nil, err
}
}
return cn, nil
}
}
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}
host := dest.NetAddr()
if (protocol == "ws" && dest.Port == 80) || (protocol == "wss" && dest.Port == 443) {
host = dest.Address.String()
}
uri := protocol + "://" + host + wsSettings.GetNormalizedPath()
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if conns != nil {
data := []byte(uri)
if ed != nil {
data = append(data, " "+base64.RawURLEncoding.EncodeToString(ed)...)
}
var conn *websocket.Conn
for {
conn = <-conns
if conn.WriteMessage(websocket.TextMessage, data) != nil {
conn.Close()
} else {
break
}
}
if _, p, err := conn.ReadMessage(); err != nil {
conn.Close()
return nil, err
} else if s := string(p); s != "ok" {
conn.Close()
return nil, newError(s)
}
return newConnection(conn, conn.RemoteAddr(), nil), nil
}
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header := wsSettings.GetRequestHeader()
if ed != nil {
// RawURLEncoding is support by both V2Ray/V2Fly and XRay.
header.Set("Sec-WebSocket-Protocol", base64.RawURLEncoding.EncodeToString(ed))
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}
conn, resp, err := dialer.DialContext(ctx, uri, header)
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if err != nil {
var reason string
if resp != nil {
reason = resp.Status
}
return nil, newError("failed to dial to (", uri, "): ", reason).Base(err)
}
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return newConnection(conn, conn.RemoteAddr(), nil), nil
}
type delayDialConn struct {
net.Conn
closed bool
dialed chan bool
cancel context.CancelFunc
ctx context.Context
dest net.Destination
streamSettings *internet.MemoryStreamConfig
}
func (d *delayDialConn) Write(b []byte) (int, error) {
if d.closed {
return 0, io.ErrClosedPipe
}
if d.Conn == nil {
ed := b
if len(ed) > int(d.streamSettings.ProtocolSettings.(*Config).Ed) {
ed = nil
}
var err error
if d.Conn, err = dialWebSocket(d.ctx, d.dest, d.streamSettings, ed); err != nil {
d.Close()
return 0, newError("failed to dial WebSocket").Base(err)
}
d.dialed <- true
if ed != nil {
return len(ed), nil
}
}
return d.Conn.Write(b)
}
func (d *delayDialConn) Read(b []byte) (int, error) {
if d.closed {
return 0, io.ErrClosedPipe
}
if d.Conn == nil {
select {
case <-d.ctx.Done():
return 0, io.ErrUnexpectedEOF
case <-d.dialed:
}
}
return d.Conn.Read(b)
}
func (d *delayDialConn) Close() error {
d.closed = true
d.cancel()
if d.Conn == nil {
return nil
}
return d.Conn.Close()
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}