transport: add httpupgrade

transport/internet/httpupgrade/dialer.go

@@ -0,0 +1,87 @@
+package httpupgrade
+
+import (
+	"bufio"
+	"context"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/stat"
+	"github.com/xtls/xray-core/transport/internet/tls"
+)
+
+func dialhttpUpgrade(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (net.Conn, error) {
+	transportConfiguration := streamSettings.ProtocolSettings.(*Config)
+
+	pconn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
+	if err != nil {
+		newError("failed to dial to ", dest).Base(err).AtError().WriteToLog()
+		return nil, err
+	}
+
+	var conn net.Conn
+	var requestURL url.URL
+	if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
+		tlsConfig := config.GetTLSConfig(tls.WithDestination(dest), tls.WithNextProto("http/1.1"))
+		if fingerprint := tls.GetFingerprint(config.Fingerprint); fingerprint != nil {
+			conn = tls.UClient(pconn, tlsConfig, fingerprint)
+			if err := conn.(*tls.UConn).WebsocketHandshakeContext(ctx); err != nil {
+				return nil, err
+			}
+		} else {
+			conn = tls.Client(pconn, tlsConfig)
+		}
+
+		requestURL.Scheme = "https"
+	} else {
+		requestURL.Scheme = "http"
+	}
+
+	requestURL.Host = dest.NetAddr()
+	requestURL.Path = transportConfiguration.GetNormalizedPath()
+	req := &http.Request{
+		Method: http.MethodGet,
+		URL:    &requestURL,
+		Host:   transportConfiguration.Host,
+		Header: make(http.Header),
+	}
+	req.Header.Set("Connection", "upgrade")
+	req.Header.Set("Upgrade", "websocket")
+
+	err = req.Write(conn)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO The bufio usage here is unreliable
+	resp, err := http.ReadResponse(bufio.NewReader(conn), req) // nolint:bodyclose
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.Status == "101 Switching Protocols" &&
+		strings.ToLower(resp.Header.Get("Upgrade")) == "websocket" &&
+		strings.ToLower(resp.Header.Get("Connection")) == "upgrade" {
+		return conn, nil
+	}
+	return nil, newError("unrecognized reply")
+}
+
+func dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (stat.Connection, error) {
+	newError("creating connection to ", dest).WriteToLog(session.ExportIDToError(ctx))
+
+	conn, err := dialhttpUpgrade(ctx, dest, streamSettings)
+	if err != nil {
+		return nil, newError("failed to dial request to ", dest).Base(err)
+	}
+	return stat.Connection(conn), nil
+}
+
+func init() {
+	common.Must(internet.RegisterTransportDialer(protocolName, dial))
+}