package websocket import ( "context" "crypto/tls" "net/http" "strconv" "sync" "time" "github.com/gorilla/websocket" "v2ray.com/core/common" "v2ray.com/core/common/net" http_proto "v2ray.com/core/common/protocol/http" "v2ray.com/core/transport/internet" v2tls "v2ray.com/core/transport/internet/tls" ) type requestHandler struct { path string ln *Listener } var upgrader = &websocket.Upgrader{ ReadBufferSize: 4 * 1024, WriteBufferSize: 4 * 1024, HandshakeTimeout: time.Second * 8, } func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) { if request.URL.Path != h.path { writer.WriteHeader(http.StatusNotFound) return } conn, err := upgrader.Upgrade(writer, request, nil) if err != nil { newError("failed to convert to WebSocket connection").Base(err).WriteToLog() return } forwardedAddrs := http_proto.ParseXForwardedFor(request.Header) remoteAddr := conn.RemoteAddr() if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().Either(net.AddressFamilyIPv4, net.AddressFamilyIPv6) { remoteAddr.(*net.TCPAddr).IP = forwardedAddrs[0].IP() } h.ln.addConn(newConnection(conn, remoteAddr)) } type Listener struct { sync.Mutex listener net.Listener tlsConfig *tls.Config config *Config addConn internet.ConnHandler } func ListenWS(ctx context.Context, address net.Address, port net.Port, addConn internet.ConnHandler) (internet.Listener, error) { networkSettings := internet.TransportSettingsFromContext(ctx) wsSettings := networkSettings.(*Config) l := &Listener{ config: wsSettings, addConn: addConn, } if config := v2tls.ConfigFromContext(ctx); config != nil { l.tlsConfig = config.GetTLSConfig() } err := l.listenws(address, port) return l, err } func (ln *Listener) listenws(address net.Address, port net.Port) error { netAddr := address.String() + ":" + strconv.Itoa(int(port.Value())) var listener net.Listener if ln.tlsConfig == nil { l, err := net.Listen("tcp", netAddr) if err != nil { return newError("failed to listen TCP ", netAddr).Base(err) } listener = l } else { l, err := tls.Listen("tcp", netAddr, ln.tlsConfig) if err != nil { return newError("failed to listen TLS ", netAddr).Base(err) } listener = l } ln.listener = listener go func() { err := http.Serve(listener, &requestHandler{ path: ln.config.GetNormalizedPath(), ln: ln, }) if err != nil { newError("failed to serve http for WebSocket").Base(err).AtWarning().WriteToLog() } }() return nil } // Addr implements net.Listener.Addr(). func (ln *Listener) Addr() net.Addr { return ln.listener.Addr() } // Close implements net.Listener.Close(). func (ln *Listener) Close() error { return ln.listener.Close() } func init() { common.Must(internet.RegisterTransportListener(internet.TransportProtocol_WebSocket, ListenWS)) }