package http import ( "context" gotls "crypto/tls" "net/http" "net/url" "sync" "github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common/buf" "github.com/xtls/xray-core/common/net" "github.com/xtls/xray-core/common/net/cnc" "github.com/xtls/xray-core/common/session" "github.com/xtls/xray-core/transport/internet" "github.com/xtls/xray-core/transport/internet/tls" "github.com/xtls/xray-core/transport/pipe" "golang.org/x/net/http2" ) type dialerConf struct { net.Destination *internet.SocketConfig } var ( globalDialerMap map[dialerConf]*http.Client globalDialerAccess sync.Mutex ) func getHTTPClient(ctx context.Context, dest net.Destination, tlsSettings *tls.Config, sockopt *internet.SocketConfig) (*http.Client, error) { globalDialerAccess.Lock() defer globalDialerAccess.Unlock() if globalDialerMap == nil { globalDialerMap = make(map[dialerConf]*http.Client) } if client, found := globalDialerMap[dialerConf{dest, sockopt}]; found { return client, nil } transport := &http2.Transport{ DialTLS: func(network string, addr string, tlsConfig *gotls.Config) (net.Conn, error) { rawHost, rawPort, err := net.SplitHostPort(addr) if err != nil { return nil, err } if len(rawPort) == 0 { rawPort = "443" } port, err := net.PortFromString(rawPort) if err != nil { return nil, err } address := net.ParseAddress(rawHost) dctx := context.Background() dctx = session.ContextWithID(dctx, session.IDFromContext(ctx)) dctx = session.ContextWithOutbound(dctx, session.OutboundFromContext(ctx)) pconn, err := internet.DialSystem(dctx, net.TCPDestination(address, port), sockopt) if err != nil { newError("failed to dial to " + addr).Base(err).AtError().WriteToLog() return nil, err } cn := gotls.Client(pconn, tlsConfig) if err := cn.Handshake(); 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 } } state := cn.ConnectionState() if p := state.NegotiatedProtocol; p != http2.NextProtoTLS { return nil, newError("http2: unexpected ALPN protocol " + p + "; want q" + http2.NextProtoTLS).AtError() } if !state.NegotiatedProtocolIsMutual { return nil, newError("http2: could not negotiate protocol mutually").AtError() } return cn, nil }, TLSClientConfig: tlsSettings.GetTLSConfig(tls.WithDestination(dest)), } client := &http.Client{ Transport: transport, } globalDialerMap[dialerConf{dest, sockopt}] = client return client, nil } // Dial dials a new TCP connection to the given destination. func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (internet.Connection, error) { httpSettings := streamSettings.ProtocolSettings.(*Config) tlsConfig := tls.ConfigFromStreamSettings(streamSettings) if tlsConfig == nil { return nil, newError("TLS must be enabled for http transport.").AtWarning() } client, err := getHTTPClient(ctx, dest, tlsConfig, streamSettings.SocketSettings) if err != nil { return nil, err } opts := pipe.OptionsFromContext(ctx) preader, pwriter := pipe.New(opts...) breader := &buf.BufferedReader{Reader: preader} request := &http.Request{ Method: "PUT", Host: httpSettings.getRandomHost(), Body: breader, URL: &url.URL{ Scheme: "https", Host: dest.NetAddr(), Path: httpSettings.getNormalizedPath(), }, Proto: "HTTP/2", ProtoMajor: 2, ProtoMinor: 0, Header: make(http.Header), } // Disable any compression method from server. request.Header.Set("Accept-Encoding", "identity") response, err := client.Do(request) if err != nil { return nil, newError("failed to dial to ", dest).Base(err).AtWarning() } if response.StatusCode != 200 { return nil, newError("unexpected status", response.StatusCode).AtWarning() } bwriter := buf.NewBufferedWriter(pwriter) common.Must(bwriter.SetBuffered(false)) return cnc.NewConnection( cnc.ConnectionOutput(response.Body), cnc.ConnectionInput(bwriter), cnc.ConnectionOnClose(common.ChainedClosable{breader, bwriter, response.Body}), ), nil } func init() { common.Must(internet.RegisterTransportDialer(protocolName, Dial)) }