package outbound import ( "context" "crypto/tls" "errors" "fmt" "net" "strconv" "github.com/Dreamacro/clash/common/structure" "github.com/Dreamacro/clash/component/dialer" C "github.com/Dreamacro/clash/constant" obfs "github.com/Dreamacro/clash/transport/simple-obfs" shadowtls "github.com/Dreamacro/clash/transport/sing-shadowtls" "github.com/Dreamacro/clash/transport/socks5" v2rayObfs "github.com/Dreamacro/clash/transport/v2ray-plugin" shadowsocks "github.com/metacubex/sing-shadowsocks" "github.com/metacubex/sing-shadowsocks/shadowimpl" "github.com/sagernet/sing/common/bufio" M "github.com/sagernet/sing/common/metadata" "github.com/sagernet/sing/common/uot" ) type ShadowSocks struct { *Base method shadowsocks.Method option *ShadowSocksOption // obfs obfsMode string obfsOption *simpleObfsOption v2rayOption *v2rayObfs.Option shadowTLSOption *shadowtls.ShadowTLSOption tlsConfig *tls.Config } type ShadowSocksOption struct { BasicOption Name string `proxy:"name"` Server string `proxy:"server"` Port int `proxy:"port"` Password string `proxy:"password"` Cipher string `proxy:"cipher"` UDP bool `proxy:"udp,omitempty"` Plugin string `proxy:"plugin,omitempty"` PluginOpts map[string]any `proxy:"plugin-opts,omitempty"` UDPOverTCP bool `proxy:"udp-over-tcp,omitempty"` } type simpleObfsOption struct { Mode string `obfs:"mode,omitempty"` Host string `obfs:"host,omitempty"` } type v2rayObfsOption struct { Mode string `obfs:"mode"` Host string `obfs:"host,omitempty"` Path string `obfs:"path,omitempty"` TLS bool `obfs:"tls,omitempty"` Fingerprint string `obfs:"fingerprint,omitempty"` Headers map[string]string `obfs:"headers,omitempty"` SkipCertVerify bool `obfs:"skip-cert-verify,omitempty"` Mux bool `obfs:"mux,omitempty"` } type shadowTLSOption struct { Password string `obfs:"password"` Host string `obfs:"host"` Fingerprint string `obfs:"fingerprint,omitempty"` ClientFingerprint string `obfs:"client-fingerprint,omitempty"` SkipCertVerify bool `obfs:"skip-cert-verify,omitempty"` Version int `obfs:"version,omitempty"` } // StreamConn implements C.ProxyAdapter func (ss *ShadowSocks) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) { switch ss.obfsMode { case shadowtls.Mode: // fix tls handshake not timeout ctx, cancel := context.WithTimeout(context.Background(), C.DefaultTLSTimeout) defer cancel() var err error c, err = shadowtls.NewShadowTLS(ctx, c, ss.shadowTLSOption) if err != nil { return nil, err } } return ss.streamConn(c, metadata) } func (ss *ShadowSocks) streamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) { switch ss.obfsMode { case "tls": c = obfs.NewTLSObfs(c, ss.obfsOption.Host) case "http": _, port, _ := net.SplitHostPort(ss.addr) c = obfs.NewHTTPObfs(c, ss.obfsOption.Host, port) case "websocket": var err error c, err = v2rayObfs.NewV2rayObfs(c, ss.v2rayOption) if err != nil { return nil, fmt.Errorf("%s connect error: %w", ss.addr, err) } } if metadata.NetWork == C.UDP && ss.option.UDPOverTCP { return ss.method.DialConn(c, M.ParseSocksaddr(uot.UOTMagicAddress+":443")) } return ss.method.DialConn(c, M.ParseSocksaddr(metadata.RemoteAddress())) } // DialContext implements C.ProxyAdapter func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.Conn, err error) { return ss.DialContextWithDialer(ctx, dialer.NewDialer(ss.Base.DialOptions(opts...)...), metadata) } // DialContextWithDialer implements C.ProxyAdapter func (ss *ShadowSocks) DialContextWithDialer(ctx context.Context, dialer C.Dialer, metadata *C.Metadata) (_ C.Conn, err error) { c, err := dialer.DialContext(ctx, "tcp", ss.addr) if err != nil { return nil, fmt.Errorf("%s connect error: %w", ss.addr, err) } tcpKeepAlive(c) defer func(c net.Conn) { safeConnClose(c, err) }(c) switch ss.obfsMode { case shadowtls.Mode: c, err = shadowtls.NewShadowTLS(ctx, c, ss.shadowTLSOption) if err != nil { return nil, err } } c, err = ss.streamConn(c, metadata) return NewConn(c, ss), err } // ListenPacketContext implements C.ProxyAdapter func (ss *ShadowSocks) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.PacketConn, error) { return ss.ListenPacketWithDialer(ctx, dialer.NewDialer(ss.Base.DialOptions(opts...)...), metadata) } // ListenPacketWithDialer implements C.ProxyAdapter func (ss *ShadowSocks) ListenPacketWithDialer(ctx context.Context, dialer C.Dialer, metadata *C.Metadata) (_ C.PacketConn, err error) { if ss.option.UDPOverTCP { tcpConn, err := ss.DialContextWithDialer(ctx, dialer, metadata) if err != nil { return nil, err } return newPacketConn(uot.NewClientConn(tcpConn), ss), nil } addr, err := resolveUDPAddrWithPrefer(ctx, "udp", ss.addr, ss.prefer) if err != nil { return nil, err } pc, err := dialer.ListenPacket(ctx, "udp", "", addr.AddrPort()) if err != nil { return nil, err } pc = ss.method.DialPacketConn(&bufio.BindPacketConn{PacketConn: pc, Addr: addr}) return newPacketConn(pc, ss), nil } // SupportWithDialer implements C.ProxyAdapter func (ss *ShadowSocks) SupportWithDialer() bool { return true } // ListenPacketOnStreamConn implements C.ProxyAdapter func (ss *ShadowSocks) ListenPacketOnStreamConn(c net.Conn, metadata *C.Metadata) (_ C.PacketConn, err error) { if ss.option.UDPOverTCP { return newPacketConn(uot.NewClientConn(c), ss), nil } return nil, errors.New("no support") } // SupportUOT implements C.ProxyAdapter func (ss *ShadowSocks) SupportUOT() bool { return ss.option.UDPOverTCP } func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) { addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port)) method, err := shadowimpl.FetchMethod(option.Cipher, option.Password) if err != nil { return nil, fmt.Errorf("ss %s initialize error: %w", addr, err) } var v2rayOption *v2rayObfs.Option var obfsOption *simpleObfsOption var shadowTLSOpt *shadowtls.ShadowTLSOption var tlsConfig *tls.Config obfsMode := "" decoder := structure.NewDecoder(structure.Option{TagName: "obfs", WeaklyTypedInput: true}) if option.Plugin == "obfs" { opts := simpleObfsOption{Host: "bing.com"} if err := decoder.Decode(option.PluginOpts, &opts); err != nil { return nil, fmt.Errorf("ss %s initialize obfs error: %w", addr, err) } if opts.Mode != "tls" && opts.Mode != "http" { return nil, fmt.Errorf("ss %s obfs mode error: %s", addr, opts.Mode) } obfsMode = opts.Mode obfsOption = &opts } else if option.Plugin == "v2ray-plugin" { opts := v2rayObfsOption{Host: "bing.com", Mux: true} if err := decoder.Decode(option.PluginOpts, &opts); err != nil { return nil, fmt.Errorf("ss %s initialize v2ray-plugin error: %w", addr, err) } if opts.Mode != "websocket" { return nil, fmt.Errorf("ss %s obfs mode error: %s", addr, opts.Mode) } obfsMode = opts.Mode v2rayOption = &v2rayObfs.Option{ Host: opts.Host, Path: opts.Path, Headers: opts.Headers, Mux: opts.Mux, } if opts.TLS { v2rayOption.TLS = true v2rayOption.SkipCertVerify = opts.SkipCertVerify } } else if option.Plugin == shadowtls.Mode { obfsMode = shadowtls.Mode opt := &shadowTLSOption{ Version: 2, } if err := decoder.Decode(option.PluginOpts, opt); err != nil { return nil, fmt.Errorf("ss %s initialize shadow-tls-plugin error: %w", addr, err) } shadowTLSOpt = &shadowtls.ShadowTLSOption{ Password: opt.Password, Host: opt.Host, Fingerprint: opt.Fingerprint, ClientFingerprint: opt.ClientFingerprint, SkipCertVerify: opt.SkipCertVerify, Version: opt.Version, } } return &ShadowSocks{ Base: &Base{ name: option.Name, addr: addr, tp: C.Shadowsocks, udp: option.UDP, iface: option.Interface, rmark: option.RoutingMark, prefer: C.NewDNSPrefer(option.IPVersion), }, method: method, option: &option, obfsMode: obfsMode, v2rayOption: v2rayOption, obfsOption: obfsOption, shadowTLSOption: shadowTLSOpt, tlsConfig: tlsConfig, }, nil } type ssPacketConn struct { net.PacketConn rAddr net.Addr } func (spc *ssPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) { packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b) if err != nil { return } return spc.PacketConn.WriteTo(packet[3:], spc.rAddr) } func (spc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) { n, _, e := spc.PacketConn.ReadFrom(b) if e != nil { return 0, nil, e } addr := socks5.SplitAddr(b[:n]) if addr == nil { return 0, nil, errors.New("parse addr error") } udpAddr := addr.UDPAddr() if udpAddr == nil { return 0, nil, errors.New("parse addr error") } copy(b, b[len(addr):]) return n - len(addr), udpAddr, e }