package outbound import ( "context" "crypto/tls" "fmt" "net" "net/http" "strconv" N "github.com/Dreamacro/clash/common/net" "github.com/Dreamacro/clash/component/ca" "github.com/Dreamacro/clash/component/dialer" "github.com/Dreamacro/clash/component/proxydialer" tlsC "github.com/Dreamacro/clash/component/tls" C "github.com/Dreamacro/clash/constant" "github.com/Dreamacro/clash/transport/gun" "github.com/Dreamacro/clash/transport/trojan" ) type Trojan struct { *Base instance *trojan.Trojan option *TrojanOption // for gun mux gunTLSConfig *tls.Config gunConfig *gun.Config transport *gun.TransportWrap realityConfig *tlsC.RealityConfig } type TrojanOption struct { BasicOption Name string `proxy:"name"` Server string `proxy:"server"` Port int `proxy:"port"` Password string `proxy:"password"` ALPN []string `proxy:"alpn,omitempty"` SNI string `proxy:"sni,omitempty"` SkipCertVerify bool `proxy:"skip-cert-verify,omitempty"` Fingerprint string `proxy:"fingerprint,omitempty"` UDP bool `proxy:"udp,omitempty"` Network string `proxy:"network,omitempty"` RealityOpts RealityOptions `proxy:"reality-opts,omitempty"` GrpcOpts GrpcOptions `proxy:"grpc-opts,omitempty"` WSOpts WSOptions `proxy:"ws-opts,omitempty"` ClientFingerprint string `proxy:"client-fingerprint,omitempty"` } func (t *Trojan) plainStream(ctx context.Context, c net.Conn) (net.Conn, error) { if t.option.Network == "ws" { host, port, _ := net.SplitHostPort(t.addr) wsOpts := &trojan.WebsocketOption{ Host: host, Port: port, Path: t.option.WSOpts.Path, V2rayHttpUpgrade: t.option.WSOpts.V2rayHttpUpgrade, } if t.option.SNI != "" { wsOpts.Host = t.option.SNI } if len(t.option.WSOpts.Headers) != 0 { header := http.Header{} for key, value := range t.option.WSOpts.Headers { header.Add(key, value) } wsOpts.Headers = header } return t.instance.StreamWebsocketConn(ctx, c, wsOpts) } return t.instance.StreamConn(ctx, c) } // StreamConnContext implements C.ProxyAdapter func (t *Trojan) StreamConnContext(ctx context.Context, c net.Conn, metadata *C.Metadata) (net.Conn, error) { var err error if tlsC.HaveGlobalFingerprint() && len(t.option.ClientFingerprint) == 0 { t.option.ClientFingerprint = tlsC.GetGlobalFingerprint() } if t.transport != nil { c, err = gun.StreamGunWithConn(c, t.gunTLSConfig, t.gunConfig, t.realityConfig) } else { c, err = t.plainStream(ctx, c) } if err != nil { return nil, fmt.Errorf("%s connect error: %w", t.addr, err) } if metadata.NetWork == C.UDP { err = t.instance.WriteHeader(c, trojan.CommandUDP, serializesSocksAddr(metadata)) return c, err } err = t.instance.WriteHeader(c, trojan.CommandTCP, serializesSocksAddr(metadata)) return c, err } // DialContext implements C.ProxyAdapter func (t *Trojan) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.Conn, err error) { // gun transport if t.transport != nil && len(opts) == 0 { c, err := gun.StreamGunWithTransport(t.transport, t.gunConfig) if err != nil { return nil, err } if err = t.instance.WriteHeader(c, trojan.CommandTCP, serializesSocksAddr(metadata)); err != nil { c.Close() return nil, err } return NewConn(c, t), nil } return t.DialContextWithDialer(ctx, dialer.NewDialer(t.Base.DialOptions(opts...)...), metadata) } // DialContextWithDialer implements C.ProxyAdapter func (t *Trojan) DialContextWithDialer(ctx context.Context, dialer C.Dialer, metadata *C.Metadata) (_ C.Conn, err error) { if len(t.option.DialerProxy) > 0 { dialer, err = proxydialer.NewByName(t.option.DialerProxy, dialer) if err != nil { return nil, err } } c, err := dialer.DialContext(ctx, "tcp", t.addr) if err != nil { return nil, fmt.Errorf("%s connect error: %w", t.addr, err) } N.TCPKeepAlive(c) defer func(c net.Conn) { safeConnClose(c, err) }(c) c, err = t.StreamConnContext(ctx, c, metadata) if err != nil { return nil, err } return NewConn(c, t), err } // ListenPacketContext implements C.ProxyAdapter func (t *Trojan) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.PacketConn, err error) { var c net.Conn // grpc transport if t.transport != nil && len(opts) == 0 { c, err = gun.StreamGunWithTransport(t.transport, t.gunConfig) if err != nil { return nil, fmt.Errorf("%s connect error: %w", t.addr, err) } defer func(c net.Conn) { safeConnClose(c, err) }(c) err = t.instance.WriteHeader(c, trojan.CommandUDP, serializesSocksAddr(metadata)) if err != nil { return nil, err } pc := t.instance.PacketConn(c) return newPacketConn(pc, t), err } return t.ListenPacketWithDialer(ctx, dialer.NewDialer(t.Base.DialOptions(opts...)...), metadata) } // ListenPacketWithDialer implements C.ProxyAdapter func (t *Trojan) ListenPacketWithDialer(ctx context.Context, dialer C.Dialer, metadata *C.Metadata) (_ C.PacketConn, err error) { if len(t.option.DialerProxy) > 0 { dialer, err = proxydialer.NewByName(t.option.DialerProxy, dialer) if err != nil { return nil, err } } c, err := dialer.DialContext(ctx, "tcp", t.addr) if err != nil { return nil, fmt.Errorf("%s connect error: %w", t.addr, err) } defer func(c net.Conn) { safeConnClose(c, err) }(c) N.TCPKeepAlive(c) c, err = t.plainStream(ctx, c) if err != nil { return nil, fmt.Errorf("%s connect error: %w", t.addr, err) } err = t.instance.WriteHeader(c, trojan.CommandUDP, serializesSocksAddr(metadata)) if err != nil { return nil, err } pc := t.instance.PacketConn(c) return newPacketConn(pc, t), err } // SupportWithDialer implements C.ProxyAdapter func (t *Trojan) SupportWithDialer() C.NetWork { return C.ALLNet } // ListenPacketOnStreamConn implements C.ProxyAdapter func (t *Trojan) ListenPacketOnStreamConn(c net.Conn, metadata *C.Metadata) (_ C.PacketConn, err error) { pc := t.instance.PacketConn(c) return newPacketConn(pc, t), err } // SupportUOT implements C.ProxyAdapter func (t *Trojan) SupportUOT() bool { return true } func NewTrojan(option TrojanOption) (*Trojan, error) { addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port)) tOption := &trojan.Option{ Password: option.Password, ALPN: option.ALPN, ServerName: option.Server, SkipCertVerify: option.SkipCertVerify, Fingerprint: option.Fingerprint, ClientFingerprint: option.ClientFingerprint, } if option.SNI != "" { tOption.ServerName = option.SNI } t := &Trojan{ Base: &Base{ name: option.Name, addr: addr, tp: C.Trojan, udp: option.UDP, tfo: option.TFO, mpTcp: option.MPTCP, iface: option.Interface, rmark: option.RoutingMark, prefer: C.NewDNSPrefer(option.IPVersion), }, instance: trojan.New(tOption), option: &option, } var err error t.realityConfig, err = option.RealityOpts.Parse() if err != nil { return nil, err } tOption.Reality = t.realityConfig if option.Network == "grpc" { dialFn := func(network, addr string) (net.Conn, error) { var err error var cDialer C.Dialer = dialer.NewDialer(t.Base.DialOptions()...) if len(t.option.DialerProxy) > 0 { cDialer, err = proxydialer.NewByName(t.option.DialerProxy, cDialer) if err != nil { return nil, err } } c, err := cDialer.DialContext(context.Background(), "tcp", t.addr) if err != nil { return nil, fmt.Errorf("%s connect error: %s", t.addr, err.Error()) } N.TCPKeepAlive(c) return c, nil } tlsConfig := &tls.Config{ NextProtos: option.ALPN, MinVersion: tls.VersionTLS12, InsecureSkipVerify: tOption.SkipCertVerify, ServerName: tOption.ServerName, } var err error tlsConfig, err = ca.GetSpecifiedFingerprintTLSConfig(tlsConfig, option.Fingerprint) if err != nil { return nil, err } t.transport = gun.NewHTTP2Client(dialFn, tlsConfig, tOption.ClientFingerprint, t.realityConfig) t.gunTLSConfig = tlsConfig t.gunConfig = &gun.Config{ ServiceName: option.GrpcOpts.GrpcServiceName, Host: tOption.ServerName, } } return t, nil }