Example #1
0
func NewClient(conn *ssh.Client, readLimitBytesPerSecond, writeLimitBytesPerSecond int64, opts ...func(*sftp.Client) error) (*sftp.Client, error) {
	s, err := conn.NewSession()
	if err != nil {
		return nil, err
	}
	if err := s.RequestSubsystem("sftp"); err != nil {
		return nil, err
	}
	pw, err := s.StdinPipe()
	if err != nil {
		return nil, err
	}
	pr, err := s.StdoutPipe()
	if err != nil {
		return nil, err
	}

	if readLimitBytesPerSecond > 0 {
		pr = flowrate.NewReader(pr, readLimitBytesPerSecond)
	}
	if writeLimitBytesPerSecond > 0 {
		pw = flowrate.NewWriter(pw, writeLimitBytesPerSecond)
	}
	return sftp.NewClientPipe(pr, pw, opts...)
}
Example #2
0
func (w *Worker) doRead(filename string) error {
	file, err := w.fs.Open(filename)
	if err != nil {
		return err
	}

	flow := flowrate.NewReader(file, -1)
	for {
		_, err := copyN(ioutil.Discard, flow, w.c.BlockSize)
		if err != nil {
			if err == io.EOF {
				break
			}

			return err
		}
	}

	flow.Close()
	w.RStatus.Add(NewStatus(flow.Status()))

	return nil
}
Example #3
0
// tryUpgrade returns true if the request was handled.
func (h *UpgradeAwareProxyHandler) tryUpgrade(w http.ResponseWriter, req *http.Request) bool {
	if !httpstream.IsUpgradeRequest(req) {
		return false
	}

	backendConn, err := proxy.DialURL(h.Location, h.Transport)
	if err != nil {
		h.Responder.Error(err)
		return true
	}
	defer backendConn.Close()

	requestHijackedConn, _, err := w.(http.Hijacker).Hijack()
	if err != nil {
		h.Responder.Error(err)
		return true
	}
	defer requestHijackedConn.Close()

	newReq, err := http.NewRequest(req.Method, h.Location.String(), req.Body)
	if err != nil {
		h.Responder.Error(err)
		return true
	}
	newReq.Header = req.Header

	if err = newReq.Write(backendConn); err != nil {
		h.Responder.Error(err)
		return true
	}

	wg := &sync.WaitGroup{}
	wg.Add(2)

	go func() {
		var writer io.WriteCloser
		if h.MaxBytesPerSec > 0 {
			writer = flowrate.NewWriter(backendConn, h.MaxBytesPerSec)
		} else {
			writer = backendConn
		}
		_, err := io.Copy(writer, requestHijackedConn)
		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
			glog.Errorf("Error proxying data from client to backend: %v", err)
		}
		wg.Done()
	}()

	go func() {
		var reader io.ReadCloser
		if h.MaxBytesPerSec > 0 {
			reader = flowrate.NewReader(backendConn, h.MaxBytesPerSec)
		} else {
			reader = backendConn
		}
		_, err := io.Copy(requestHijackedConn, reader)
		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
			glog.Errorf("Error proxying data from backend to client: %v", err)
		}
		wg.Done()
	}()

	wg.Wait()
	return true
}
Example #4
0
// tryUpgrade returns true if the request was handled.
func (h *UpgradeAwareProxyHandler) tryUpgrade(w http.ResponseWriter, req *http.Request) bool {
	if !httpstream.IsUpgradeRequest(req) {
		return false
	}

	var (
		backendConn net.Conn
		rawResponse []byte
		err         error
	)
	if h.InterceptRedirects && utilconfig.DefaultFeatureGate.StreamingProxyRedirects() {
		backendConn, rawResponse, err = h.connectBackendWithRedirects(req)
	} else {
		backendConn, err = h.connectBackend(req.Method, h.Location, req.Header, req.Body)
	}
	if err != nil {
		h.Responder.Error(err)
		return true
	}
	defer backendConn.Close()

	// Once the connection is hijacked, the ErrorResponder will no longer work, so
	// hijacking should be the last step in the upgrade.
	requestHijacker, ok := w.(http.Hijacker)
	if !ok {
		h.Responder.Error(fmt.Errorf("request connection cannot be hijacked: %T", w))
		return true
	}
	requestHijackedConn, _, err := requestHijacker.Hijack()
	if err != nil {
		h.Responder.Error(fmt.Errorf("error hijacking request connection: %v", err))
		return true
	}
	defer requestHijackedConn.Close()

	// Forward raw response bytes back to client.
	if len(rawResponse) > 0 {
		if _, err = requestHijackedConn.Write(rawResponse); err != nil {
			utilruntime.HandleError(fmt.Errorf("Error proxying response from backend to client: %v", err))
		}
	}

	// Proxy the connection.
	wg := &sync.WaitGroup{}
	wg.Add(2)

	go func() {
		var writer io.WriteCloser
		if h.MaxBytesPerSec > 0 {
			writer = flowrate.NewWriter(backendConn, h.MaxBytesPerSec)
		} else {
			writer = backendConn
		}
		_, err := io.Copy(writer, requestHijackedConn)
		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
			glog.Errorf("Error proxying data from client to backend: %v", err)
		}
		wg.Done()
	}()

	go func() {
		var reader io.ReadCloser
		if h.MaxBytesPerSec > 0 {
			reader = flowrate.NewReader(backendConn, h.MaxBytesPerSec)
		} else {
			reader = backendConn
		}
		_, err := io.Copy(requestHijackedConn, reader)
		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
			glog.Errorf("Error proxying data from backend to client: %v", err)
		}
		wg.Done()
	}()

	wg.Wait()
	return true
}