package client import ( "crypto/tls" "fmt" "io" "net" "net/http" "net/http/httputil" "os" "runtime" "strings" "github.com/docker/docker/api" "github.com/docker/docker/dockerversion" "github.com/docker/docker/pkg/term" "github.com/docker/docker/utils" ) func (cli *DockerCli) dial() (net.Conn, error) { if cli.tlsConfig != nil && cli.proto != "unix" { return tls.Dial(cli.proto, cli.addr, cli.tlsConfig) } return net.Dial(cli.proto, cli.addr) } func (cli *DockerCli) hijack(method, path string, setRawTerminal bool, in io.ReadCloser, stdout, stderr io.Writer, started chan io.Closer) error { defer func() { if started != nil { close(started) } }() req, err := http.NewRequest(method, fmt.Sprintf("/v%s%s", api.APIVERSION, path), nil) if err != nil { return err } req.Header.Set("User-Agent", "Docker-Client/"+dockerversion.VERSION) req.Header.Set("Content-Type", "plain/text") req.Host = cli.addr dial, err := cli.dial() if err != nil { if strings.Contains(err.Error(), "connection refused") { return fmt.Errorf("Cannot connect to the Docker daemon. Is 'docker -d' running on this host?") } return err } clientconn := httputil.NewClientConn(dial, nil) defer clientconn.Close() // Server hijacks the connection, error 'connection closed' expected clientconn.Do(req) rwc, br := clientconn.Hijack() defer rwc.Close() if started != nil { started <- rwc } var receiveStdout chan error var oldState *term.State if in != nil && setRawTerminal && cli.isTerminal && os.Getenv("NORAW") == "" { oldState, err = term.SetRawTerminal(cli.terminalFd) if err != nil { return err } defer term.RestoreTerminal(cli.terminalFd, oldState) } if stdout != nil || stderr != nil { receiveStdout = utils.Go(func() (err error) { defer func() { if in != nil { if setRawTerminal && cli.isTerminal { term.RestoreTerminal(cli.terminalFd, oldState) } // For some reason this Close call blocks on darwin.. // As the client exists right after, simply discard the close // until we find a better solution. if runtime.GOOS != "darwin" { in.Close() } } }() // When TTY is ON, use regular copy if setRawTerminal && stdout != nil { _, err = io.Copy(stdout, br) } else { _, err = utils.StdCopy(stdout, stderr, br) } utils.Debugf("[hijack] End of stdout") return err }) } sendStdin := utils.Go(func() error { if in != nil { io.Copy(rwc, in) utils.Debugf("[hijack] End of stdin") } if tcpc, ok := rwc.(*net.TCPConn); ok { if err := tcpc.CloseWrite(); err != nil { utils.Debugf("Couldn't send EOF: %s\n", err) } } else if unixc, ok := rwc.(*net.UnixConn); ok { if err := unixc.CloseWrite(); err != nil { utils.Debugf("Couldn't send EOF: %s\n", err) } } // Discard errors due to pipe interruption return nil }) if stdout != nil || stderr != nil { if err := <-receiveStdout; err != nil { utils.Debugf("Error receiveStdout: %s", err) return err } } if !cli.isTerminal { if err := <-sendStdin; err != nil { utils.Debugf("Error sendStdin: %s", err) return err } } return nil }