package http import ( "bufio" "context" "encoding/base64" "io" "net/http" "strconv" "strings" "time" "v2ray.com/core" "v2ray.com/core/common" "v2ray.com/core/common/buf" "v2ray.com/core/common/errors" "v2ray.com/core/common/log" "v2ray.com/core/common/net" http_proto "v2ray.com/core/common/protocol/http" "v2ray.com/core/common/session" "v2ray.com/core/common/signal" "v2ray.com/core/common/task" "v2ray.com/core/transport/internet" "v2ray.com/core/transport/pipe" ) // Server is an HTTP proxy server. type Server struct { config *ServerConfig v *core.Instance } // NewServer creates a new HTTP inbound handler. func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) { s := &Server{ config: config, v: core.MustFromContext(ctx), } return s, nil } func (s *Server) policy() core.Policy { config := s.config p := s.v.PolicyManager().ForLevel(config.UserLevel) if config.Timeout > 0 && config.UserLevel == 0 { p.Timeouts.ConnectionIdle = time.Duration(config.Timeout) * time.Second } return p } func (*Server) Network() net.NetworkList { return net.NetworkList{ Network: []net.Network{net.Network_TCP}, } } func parseHost(rawHost string, defaultPort net.Port) (net.Destination, error) { port := defaultPort host, rawPort, err := net.SplitHostPort(rawHost) if err != nil { if addrError, ok := err.(*net.AddrError); ok && strings.Contains(addrError.Err, "missing port") { host = rawHost } else { return net.Destination{}, err } } else if len(rawPort) > 0 { intPort, err := strconv.Atoi(rawPort) if err != nil { return net.Destination{}, err } port = net.Port(intPort) } return net.TCPDestination(net.ParseAddress(host), port), nil } func isTimeout(err error) bool { nerr, ok := errors.Cause(err).(net.Error) return ok && nerr.Timeout() } func parseBasicAuth(auth string) (username, password string, ok bool) { const prefix = "Basic " if !strings.HasPrefix(auth, prefix) { return } c, err := base64.StdEncoding.DecodeString(auth[len(prefix):]) if err != nil { return } cs := string(c) s := strings.IndexByte(cs, ':') if s < 0 { return } return cs[:s], cs[s+1:], true } type readerOnly struct { io.Reader } func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher core.Dispatcher) error { reader := bufio.NewReaderSize(readerOnly{conn}, buf.Size) Start: if err := conn.SetReadDeadline(time.Now().Add(s.policy().Timeouts.Handshake)); err != nil { newError("failed to set read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx)) } request, err := http.ReadRequest(reader) if err != nil { trace := newError("failed to read http request").Base(err) if errors.Cause(err) != io.EOF && !isTimeout(errors.Cause(err)) { trace.AtWarning() // nolint: errcheck } return trace } if len(s.config.Accounts) > 0 { user, pass, ok := parseBasicAuth(request.Header.Get("Proxy-Authorization")) if !ok || !s.config.HasAccount(user, pass) { return common.Error2(conn.Write([]byte("HTTP/1.1 407 Proxy Authentication Required\r\nProxy-Authenticate: Basic realm=\"proxy\"\r\n\r\n"))) } } newError("request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]").WriteToLog(session.ExportIDToError(ctx)) if err := conn.SetReadDeadline(time.Time{}); err != nil { newError("failed to clear read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx)) } defaultPort := net.Port(80) if strings.ToLower(request.URL.Scheme) == "https" { defaultPort = net.Port(443) } host := request.Host if len(host) == 0 { host = request.URL.Host } dest, err := parseHost(host, defaultPort) if err != nil { return newError("malformed proxy host: ", host).AtWarning().Base(err) } log.Record(&log.AccessMessage{ From: conn.RemoteAddr(), To: request.URL, Status: log.AccessAccepted, }) if strings.ToUpper(request.Method) == "CONNECT" { return s.handleConnect(ctx, request, reader, conn, dest, dispatcher) } keepAlive := (strings.TrimSpace(strings.ToLower(request.Header.Get("Proxy-Connection"))) == "keep-alive") err = s.handlePlainHTTP(ctx, request, conn, dest, dispatcher) if err == errWaitAnother { if keepAlive { goto Start } err = nil } return err } func (s *Server) handleConnect(ctx context.Context, request *http.Request, reader *bufio.Reader, conn internet.Connection, dest net.Destination, dispatcher core.Dispatcher) error { _, err := conn.Write([]byte("HTTP/1.1 200 Connection established\r\n\r\n")) if err != nil { return newError("failed to write back OK response").Base(err) } plcy := s.policy() ctx, cancel := context.WithCancel(ctx) timer := signal.CancelAfterInactivity(ctx, cancel, plcy.Timeouts.ConnectionIdle) ctx = core.ContextWithBufferPolicy(ctx, plcy.Buffer) link, err := dispatcher.Dispatch(ctx, dest) if err != nil { return err } if reader.Buffered() > 0 { payload, err := buf.ReadSizeToMultiBuffer(reader, int32(reader.Buffered())) if err != nil { return err } if err := link.Writer.WriteMultiBuffer(payload); err != nil { return err } reader = nil } requestDone := func() error { defer timer.SetTimeout(s.policy().Timeouts.DownlinkOnly) v2reader := buf.NewReader(conn) return buf.Copy(v2reader, link.Writer, buf.UpdateActivity(timer)) } responseDone := func() error { defer timer.SetTimeout(s.policy().Timeouts.UplinkOnly) v2writer := buf.NewWriter(conn) if err := buf.Copy(link.Reader, v2writer, buf.UpdateActivity(timer)); err != nil { return err } return nil } var closeWriter = task.Single(requestDone, task.OnSuccess(task.Close(link.Writer))) if err := task.Run(task.WithContext(ctx), task.Parallel(closeWriter, responseDone))(); err != nil { pipe.CloseError(link.Reader) pipe.CloseError(link.Writer) return newError("connection ends").Base(err) } return nil } var errWaitAnother = newError("keep alive") func (s *Server) handlePlainHTTP(ctx context.Context, request *http.Request, writer io.Writer, dest net.Destination, dispatcher core.Dispatcher) error { if !s.config.AllowTransparent && len(request.URL.Host) <= 0 { // RFC 2068 (HTTP/1.1) requires URL to be absolute URL in HTTP proxy. response := &http.Response{ Status: "Bad Request", StatusCode: 400, Proto: "HTTP/1.1", ProtoMajor: 1, ProtoMinor: 1, Header: http.Header(make(map[string][]string)), Body: nil, ContentLength: 0, Close: true, } response.Header.Set("Proxy-Connection", "close") response.Header.Set("Connection", "close") return response.Write(writer) } if len(request.URL.Host) > 0 { request.Host = request.URL.Host } http_proto.RemoveHopByHopHeaders(request.Header) // Prevent UA from being set to golang's default ones if len(request.Header.Get("User-Agent")) == 0 { request.Header.Set("User-Agent", "") } link, err := dispatcher.Dispatch(ctx, dest) if err != nil { return err } // Plain HTTP request is not a stream. The request always finishes before response. Hense request has to be closed later. defer common.Close(link.Writer) // nolint: errcheck var result error = errWaitAnother requestDone := func() error { request.Header.Set("Connection", "close") requestWriter := buf.NewBufferedWriter(link.Writer) common.Must(requestWriter.SetBuffered(false)) if err := request.Write(requestWriter); err != nil { return newError("failed to write whole request").Base(err).AtWarning() } return nil } responseDone := func() error { responseReader := bufio.NewReaderSize(&buf.BufferedReader{Reader: link.Reader}, buf.Size) response, err := http.ReadResponse(responseReader, request) if err == nil { http_proto.RemoveHopByHopHeaders(response.Header) if response.ContentLength >= 0 { response.Header.Set("Proxy-Connection", "keep-alive") response.Header.Set("Connection", "keep-alive") response.Header.Set("Keep-Alive", "timeout=4") response.Close = false } else { response.Close = true result = nil } } else { newError("failed to read response from ", request.Host).Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx)) response = &http.Response{ Status: "Service Unavailable", StatusCode: 503, Proto: "HTTP/1.1", ProtoMajor: 1, ProtoMinor: 1, Header: http.Header(make(map[string][]string)), Body: nil, ContentLength: 0, Close: true, } response.Header.Set("Connection", "close") response.Header.Set("Proxy-Connection", "close") } if err := response.Write(writer); err != nil { return newError("failed to write response").Base(err).AtWarning() } return nil } if err := task.Run(task.WithContext(ctx), task.Parallel(requestDone, responseDone))(); err != nil { pipe.CloseError(link.Reader) pipe.CloseError(link.Writer) return newError("connection ends").Base(err) } return result } func init() { common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { return NewServer(ctx, config.(*ServerConfig)) })) }