package main import ( "bufio" "bytes" "context" "fmt" "io" "net" "net/http" "net/http/httputil" "strings" "time" "github.com/docker/docker/api/types" "github.com/docker/docker/client" "github.com/docker/docker/internal/test/request" "github.com/docker/docker/pkg/stdcopy" "github.com/go-check/check" "github.com/pkg/errors" "golang.org/x/net/websocket" "gotest.tools/assert" is "gotest.tools/assert/cmp" ) func (s *DockerSuite) TestGetContainersAttachWebsocket(c *check.C) { testRequires(c, DaemonIsLinux) out, _ := dockerCmd(c, "run", "-dit", "busybox", "cat") rwc, err := request.SockConn(time.Duration(10*time.Second), request.DaemonHost()) assert.NilError(c, err) cleanedContainerID := strings.TrimSpace(out) config, err := websocket.NewConfig( "/containers/"+cleanedContainerID+"/attach/ws?stream=1&stdin=1&stdout=1&stderr=1", "http://localhost", ) assert.NilError(c, err) ws, err := websocket.NewClient(config, rwc) assert.NilError(c, err) defer ws.Close() expected := []byte("hello") actual := make([]byte, len(expected)) outChan := make(chan error) go func() { _, err := io.ReadFull(ws, actual) outChan <- err close(outChan) }() inChan := make(chan error) go func() { _, err := ws.Write(expected) inChan <- err close(inChan) }() select { case err := <-inChan: assert.NilError(c, err) case <-time.After(5 * time.Second): c.Fatal("Timeout writing to ws") } select { case err := <-outChan: assert.NilError(c, err) case <-time.After(5 * time.Second): c.Fatal("Timeout reading from ws") } assert.Assert(c, is.DeepEqual(actual, expected), "Websocket didn't return the expected data") } // regression gh14320 func (s *DockerSuite) TestPostContainersAttachContainerNotFound(c *check.C) { resp, _, err := request.Post("/containers/doesnotexist/attach") assert.NilError(c, err) // connection will shutdown, err should be "persistent connection closed" assert.Equal(c, resp.StatusCode, http.StatusNotFound) content, err := request.ReadBody(resp.Body) assert.NilError(c, err) expected := "No such container: doesnotexist\r\n" assert.Equal(c, string(content), expected) } func (s *DockerSuite) TestGetContainersWsAttachContainerNotFound(c *check.C) { res, body, err := request.Get("/containers/doesnotexist/attach/ws") assert.Equal(c, res.StatusCode, http.StatusNotFound) assert.NilError(c, err) b, err := request.ReadBody(body) assert.NilError(c, err) expected := "No such container: doesnotexist" assert.Assert(c, strings.Contains(getErrorMessage(c, b), expected)) } func (s *DockerSuite) TestPostContainersAttach(c *check.C) { testRequires(c, DaemonIsLinux) expectSuccess := func(conn net.Conn, br *bufio.Reader, stream string, tty bool) { defer conn.Close() expected := []byte("success") _, err := conn.Write(expected) assert.NilError(c, err) conn.SetReadDeadline(time.Now().Add(time.Second)) lenHeader := 0 if !tty { lenHeader = 8 } actual := make([]byte, len(expected)+lenHeader) _, err = io.ReadFull(br, actual) assert.NilError(c, err) if !tty { fdMap := map[string]byte{ "stdin": 0, "stdout": 1, "stderr": 2, } assert.Equal(c, actual[0], fdMap[stream]) } assert.Assert(c, is.DeepEqual(actual[lenHeader:], expected), "Attach didn't return the expected data from %s", stream) } expectTimeout := func(conn net.Conn, br *bufio.Reader, stream string) { defer conn.Close() _, err := conn.Write([]byte{'t'}) assert.NilError(c, err) conn.SetReadDeadline(time.Now().Add(time.Second)) actual := make([]byte, 1) _, err = io.ReadFull(br, actual) opErr, ok := err.(*net.OpError) assert.Assert(c, ok, "Error is expected to be *net.OpError, got %v", err) assert.Assert(c, opErr.Timeout(), "Read from %s is expected to timeout", stream) } // Create a container that only emits stdout. cid, _ := dockerCmd(c, "run", "-di", "busybox", "cat") cid = strings.TrimSpace(cid) // Attach to the container's stdout stream. conn, br, err := sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stdout=1", nil, "text/plain", request.DaemonHost()) assert.NilError(c, err) // Check if the data from stdout can be received. expectSuccess(conn, br, "stdout", false) // Attach to the container's stderr stream. conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stderr=1", nil, "text/plain", request.DaemonHost()) assert.NilError(c, err) // Since the container only emits stdout, attaching to stderr should return nothing. expectTimeout(conn, br, "stdout") // Test the similar functions of the stderr stream. cid, _ = dockerCmd(c, "run", "-di", "busybox", "/bin/sh", "-c", "cat >&2") cid = strings.TrimSpace(cid) conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stderr=1", nil, "text/plain", request.DaemonHost()) assert.NilError(c, err) expectSuccess(conn, br, "stderr", false) conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stdout=1", nil, "text/plain", request.DaemonHost()) assert.NilError(c, err) expectTimeout(conn, br, "stderr") // Test with tty. cid, _ = dockerCmd(c, "run", "-dit", "busybox", "/bin/sh", "-c", "cat >&2") cid = strings.TrimSpace(cid) // Attach to stdout only. conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stdout=1", nil, "text/plain", request.DaemonHost()) assert.NilError(c, err) expectSuccess(conn, br, "stdout", true) // Attach without stdout stream. conn, br, err = sockRequestHijack("POST", "/containers/"+cid+"/attach?stream=1&stdin=1&stderr=1", nil, "text/plain", request.DaemonHost()) assert.NilError(c, err) // Nothing should be received because both the stdout and stderr of the container will be // sent to the client as stdout when tty is enabled. expectTimeout(conn, br, "stdout") // Test the client API client, err := client.NewClientWithOpts(client.FromEnv) assert.NilError(c, err) defer client.Close() cid, _ = dockerCmd(c, "run", "-di", "busybox", "/bin/sh", "-c", "echo hello; cat") cid = strings.TrimSpace(cid) // Make sure we don't see "hello" if Logs is false attachOpts := types.ContainerAttachOptions{ Stream: true, Stdin: true, Stdout: true, Stderr: true, Logs: false, } resp, err := client.ContainerAttach(context.Background(), cid, attachOpts) assert.NilError(c, err) expectSuccess(resp.Conn, resp.Reader, "stdout", false) // Make sure we do see "hello" if Logs is true attachOpts.Logs = true resp, err = client.ContainerAttach(context.Background(), cid, attachOpts) assert.NilError(c, err) defer resp.Conn.Close() resp.Conn.SetReadDeadline(time.Now().Add(time.Second)) _, err = resp.Conn.Write([]byte("success")) assert.NilError(c, err) var outBuf, errBuf bytes.Buffer _, err = stdcopy.StdCopy(&outBuf, &errBuf, resp.Reader) if err != nil && errors.Cause(err).(net.Error).Timeout() { // ignore the timeout error as it is expected err = nil } assert.NilError(c, err) assert.Equal(c, errBuf.String(), "") assert.Equal(c, outBuf.String(), "hello\nsuccess") } // SockRequestHijack creates a connection to specified host (with method, contenttype, …) and returns a hijacked connection // and the output as a `bufio.Reader` func sockRequestHijack(method, endpoint string, data io.Reader, ct string, daemon string, modifiers ...func(*http.Request)) (net.Conn, *bufio.Reader, error) { req, client, err := newRequestClient(method, endpoint, data, ct, daemon, modifiers...) if err != nil { return nil, nil, err } client.Do(req) conn, br := client.Hijack() return conn, br, nil } // FIXME(vdemeester) httputil.ClientConn is deprecated, use http.Client instead (closer to actual client) // Deprecated: Use New instead of NewRequestClient // Deprecated: use request.Do (or Get, Delete, Post) instead func newRequestClient(method, endpoint string, data io.Reader, ct, daemon string, modifiers ...func(*http.Request)) (*http.Request, *httputil.ClientConn, error) { c, err := request.SockConn(time.Duration(10*time.Second), daemon) if err != nil { return nil, nil, fmt.Errorf("could not dial docker daemon: %v", err) } client := httputil.NewClientConn(c, nil) req, err := http.NewRequest(method, endpoint, data) if err != nil { client.Close() return nil, nil, fmt.Errorf("could not create new request: %v", err) } for _, opt := range modifiers { opt(req) } if ct != "" { req.Header.Set("Content-Type", ct) } return req, client, nil }