package websocket import ( "context" "crypto/tls" "net/http" "sync" "time" "v2ray.com/core/common" "v2ray.com/core/common/net" http_proto "v2ray.com/core/common/protocol/http" "v2ray.com/core/common/session" "v2ray.com/core/external/github.com/gorilla/websocket" "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 * 4, } 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().IsIP() { remoteAddr.(*net.TCPAddr).IP = forwardedAddrs[0].IP() } h.ln.addConn(newConnection(conn, remoteAddr)) } type Listener struct { sync.Mutex server http.Server listener net.Listener config *Config addConn internet.ConnHandler } func ListenWS(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, addConn internet.ConnHandler) (internet.Listener, error) { wsSettings := streamSettings.ProtocolSettings.(*Config) var tlsConfig *tls.Config if config := v2tls.ConfigFromStreamSettings(streamSettings); config != nil { tlsConfig = config.GetTLSConfig() } listener, err := listenTCP(ctx, address, port, tlsConfig, streamSettings.SocketSettings) if err != nil { return nil, err } l := &Listener{ config: wsSettings, addConn: addConn, listener: listener, } l.server = http.Server{ Handler: &requestHandler{ path: wsSettings.GetNormalizedPath(), ln: l, }, ReadHeaderTimeout: time.Second * 4, MaxHeaderBytes: 2048, } go func() { if err := l.server.Serve(l.listener); err != nil { newError("failed to serve http for WebSocket").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx)) } }() return l, err } func listenTCP(ctx context.Context, address net.Address, port net.Port, tlsConfig *tls.Config, sockopt *internet.SocketConfig) (net.Listener, error) { listener, err := internet.ListenSystem(ctx, &net.TCPAddr{ IP: address.IP(), Port: int(port), }, sockopt) if err != nil { return nil, newError("failed to listen TCP on", address, ":", port).Base(err) } if tlsConfig != nil { return tls.NewListener(listener, tlsConfig), nil } return listener, 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(protocolName, ListenWS)) }