chore: Remove legacy XTLS support (#645)

* chore: Remove legacy XTLS support

* chore: Rename function

transport/vless/conn.go

@@ -3,7 +3,6 @@ package vless
 import (
 	"encoding/binary"
 	"errors"
-	"fmt"
 	"io"
 	"net"
 	"sync"
@@ -13,7 +12,6 @@ import (
 	"github.com/Dreamacro/clash/transport/vless/vision"
 
 	"github.com/gofrs/uuid/v5"
-	xtls "github.com/xtls/go"
 	"google.golang.org/protobuf/proto"
 )
 
@@ -201,25 +199,6 @@ func newConn(conn net.Conn, client *Client, dst *DstAddr) (net.Conn, error) {
 
 	if client.Addons != nil {
 		switch client.Addons.Flow {
-		case XRO, XRD, XRS:
-			if !dst.UDP {
-				if xtlsConn, ok := conn.(*xtls.Conn); ok {
-					xtlsConn.RPRX = true
-					xtlsConn.SHOW = client.XTLSShow
-					xtlsConn.MARK = "XTLS"
-					if client.Addons.Flow == XRS {
-						client.Addons.Flow = XRD
-					}
-
-					if client.Addons.Flow == XRD {
-						xtlsConn.DirectMode = true
-					}
-					c.addons = client.Addons
-				} else {
-					return nil, fmt.Errorf("failed to use %s, maybe \"security\" is not \"xtls\"", client.Addons.Flow)
-				}
-			}
-
 		case XRV:
 			visionConn, err := vision.NewConn(c, c.id)
 			if err != nil {

transport/vless/vless.go

@@ -42,9 +42,8 @@ type DstAddr struct {
 
 // Client is vless connection generator
 type Client struct {
-	uuid     *uuid.UUID
-	Addons   *Addons
-	XTLSShow bool
+	uuid   *uuid.UUID
+	Addons *Addons
 }
 
 // StreamConn return a Conn with net.Conn and DstAddr
@@ -53,15 +52,14 @@ func (c *Client) StreamConn(conn net.Conn, dst *DstAddr) (net.Conn, error) {
 }
 
 // NewClient return Client instance
-func NewClient(uuidStr string, addons *Addons, xtlsShow bool) (*Client, error) {
+func NewClient(uuidStr string, addons *Addons) (*Client, error) {
 	uid, err := utils.UUIDMap(uuidStr)
 	if err != nil {
 		return nil, err
 	}
 
 	return &Client{
-		uuid:     &uid,
-		Addons:   addons,
-		XTLSShow: xtlsShow,
+		uuid:   &uid,
+		Addons: addons,
 	}, nil
 }

transport/vless/xtls.go

@@ -1,37 +0,0 @@
-package vless
-
-import (
-	"context"
-	"net"
-
-	tlsC "github.com/Dreamacro/clash/component/tls"
-	xtls "github.com/xtls/go"
-)
-
-type XTLSConfig struct {
-	Host           string
-	SkipCertVerify bool
-	Fingerprint    string
-	NextProtos     []string
-}
-
-func StreamXTLSConn(ctx context.Context, conn net.Conn, cfg *XTLSConfig) (net.Conn, error) {
-	xtlsConfig := &xtls.Config{
-		ServerName:         cfg.Host,
-		InsecureSkipVerify: cfg.SkipCertVerify,
-		NextProtos:         cfg.NextProtos,
-	}
-	if len(cfg.Fingerprint) == 0 {
-		xtlsConfig = tlsC.GetGlobalXTLSConfig(xtlsConfig)
-	} else {
-		var err error
-		if xtlsConfig, err = tlsC.GetSpecifiedFingerprintXTLSConfig(xtlsConfig, cfg.Fingerprint); err != nil {
-			return nil, err
-		}
-	}
-
-	xtlsConn := xtls.Client(conn, xtlsConfig)
-
-	err := xtlsConn.HandshakeContext(ctx)
-	return xtlsConn, err
-}