package outbound import ( "context" "crypto/tls" "fmt" "net" "net/http" "strconv" "github.com/Dreamacro/clash/component/dialer" C "github.com/Dreamacro/clash/constant" "github.com/Dreamacro/clash/transport/gun" "github.com/Dreamacro/clash/transport/trojan" "golang.org/x/net/http2" ) type Trojan struct { *Base instance *trojan.Trojan option *TrojanOption // for gun mux gunTLSConfig *tls.Config gunConfig *gun.Config transport *http2.Transport } 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"` UDP bool `proxy:"udp,omitempty"` Network string `proxy:"network,omitempty"` GrpcOpts GrpcOptions `proxy:"grpc-opts,omitempty"` WSOpts WSOptions `proxy:"ws-opts,omitempty"` } func (t *Trojan) plainStream(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, } 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(c, wsOpts) } return t.instance.StreamConn(c) } // StreamConn implements C.ProxyAdapter func (t *Trojan) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) { var err error if t.transport != nil { c, err = gun.StreamGunWithConn(c, t.gunTLSConfig, t.gunConfig) } else { c, err = t.plainStream(c) } if err != nil { return nil, fmt.Errorf("%s connect error: %w", t.addr, 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 } c, err := dialer.DialContext(ctx, "tcp", t.addr, t.Base.DialOptions(opts...)...) if err != nil { return nil, fmt.Errorf("%s connect error: %w", t.addr, err) } tcpKeepAlive(c) defer safeConnClose(c, err) c, err = t.StreamConn(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 safeConnClose(c, err) } else { c, err = dialer.DialContext(ctx, "tcp", t.addr, t.Base.DialOptions(opts...)...) if err != nil { return nil, fmt.Errorf("%s connect error: %w", t.addr, err) } defer safeConnClose(c, err) tcpKeepAlive(c) c, err = t.plainStream(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 } 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, } if option.SNI != "" { tOption.ServerName = option.SNI } t := &Trojan{ Base: &Base{ name: option.Name, addr: addr, tp: C.Trojan, udp: option.UDP, iface: option.Interface, rmark: option.RoutingMark, }, instance: trojan.New(tOption), option: &option, } if option.Network == "grpc" { dialFn := func(network, addr string) (net.Conn, error) { c, err := dialer.DialContext(context.Background(), "tcp", t.addr, t.Base.DialOptions()...) if err != nil { return nil, fmt.Errorf("%s connect error: %s", t.addr, err.Error()) } tcpKeepAlive(c) return c, nil } tlsConfig := &tls.Config{ NextProtos: option.ALPN, MinVersion: tls.VersionTLS12, InsecureSkipVerify: tOption.SkipCertVerify, ServerName: tOption.ServerName, } t.transport = gun.NewHTTP2Client(dialFn, tlsConfig) t.gunTLSConfig = tlsConfig t.gunConfig = &gun.Config{ ServiceName: option.GrpcOpts.GrpcServiceName, Host: tOption.ServerName, } } return t, nil }