package http import ( "bufio" "context" "io" "net/http" "runtime" "strconv" "strings" "time" "v2ray.com/core/app" "v2ray.com/core/app/dispatcher" "v2ray.com/core/app/log" "v2ray.com/core/common" "v2ray.com/core/common/buf" "v2ray.com/core/common/errors" "v2ray.com/core/common/net" "v2ray.com/core/common/signal" "v2ray.com/core/transport/internet" ) // Server is a HTTP proxy server. type Server struct { config *ServerConfig } // NewServer creates a new HTTP inbound handler. func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) { space := app.SpaceFromContext(ctx) if space == nil { return nil, newError("no space in context.") } s := &Server{ config: config, } return s, nil } 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 { 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 := err.(net.Error) return ok && nerr.Timeout() } func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher dispatcher.Interface) error { reader := bufio.NewReaderSize(conn, 2048) Start: conn.SetReadDeadline(time.Now().Add(time.Second * 16)) 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() } return trace } log.Trace(newError("request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]")) conn.SetReadDeadline(time.Time{}) 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.Access(conn.RemoteAddr(), request.URL, 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, reader, 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 io.Reader, writer io.Writer, dest net.Destination, dispatcher dispatcher.Interface) error { _, err := writer.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) } timeout := time.Second * time.Duration(s.config.Timeout) if timeout == 0 { timeout = time.Minute * 2 } ctx, timer := signal.CancelAfterInactivity(ctx, timeout) ray, err := dispatcher.Dispatch(ctx, dest) if err != nil { return err } requestDone := signal.ExecuteAsync(func() error { defer ray.InboundInput().Close() v2reader := buf.NewReader(reader) if err := buf.Copy(v2reader, ray.InboundInput(), buf.UpdateActivity(timer)); err != nil { return err } return nil }) responseDone := signal.ExecuteAsync(func() error { v2writer := buf.NewWriter(writer) if err := buf.Copy(ray.InboundOutput(), v2writer, buf.UpdateActivity(timer)); err != nil { return err } return nil }) if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil { ray.InboundInput().CloseError() ray.InboundOutput().CloseError() return newError("connection ends").Base(err) } runtime.KeepAlive(timer) return nil } // @VisibleForTesting func StripHopByHopHeaders(header http.Header) { // Strip hop-by-hop header basaed on RFC: // http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1 // https://www.mnot.net/blog/2011/07/11/what_proxies_must_do header.Del("Proxy-Connection") header.Del("Proxy-Authenticate") header.Del("Proxy-Authorization") header.Del("TE") header.Del("Trailers") header.Del("Transfer-Encoding") header.Del("Upgrade") connections := header.Get("Connection") header.Del("Connection") if len(connections) == 0 { return } for _, h := range strings.Split(connections, ",") { header.Del(strings.TrimSpace(h)) } } var errWaitAnother = newError("keep alive") func (s *Server) handlePlainHTTP(ctx context.Context, request *http.Request, reader io.Reader, writer io.Writer, dest net.Destination, dispatcher dispatcher.Interface) error { if len(request.URL.Host) <= 0 { 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) } request.Host = request.URL.Host StripHopByHopHeaders(request.Header) ray, err := dispatcher.Dispatch(ctx, dest) if err != nil { return err } input := ray.InboundInput() output := ray.InboundOutput() defer input.Close() var result error = errWaitAnother requestDone := signal.ExecuteAsync(func() error { request.Header.Set("Connection", "close") requestWriter := buf.ToBytesWriter(ray.InboundInput()) if err := request.Write(requestWriter); err != nil { return err } return nil }) responseDone := signal.ExecuteAsync(func() error { responseReader := bufio.NewReaderSize(buf.ToBytesReader(ray.InboundOutput()), 2048) response, err := http.ReadResponse(responseReader, request) if err == nil { StripHopByHopHeaders(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 { log.Trace(newError("failed to read response from ", request.Host).Base(err).AtWarning()) 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) } return nil }) if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil { input.CloseError() output.CloseError() 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)) })) }