package libpod import ( "bufio" "encoding/binary" "fmt" "io" "net/http" "os" "os/exec" "path/filepath" "sort" "strings" "time" "github.com/containers/common/pkg/config" "github.com/containers/podman/v2/libpod/define" "github.com/containers/podman/v2/utils" "github.com/cri-o/ocicni/pkg/ocicni" "github.com/fsnotify/fsnotify" spec "github.com/opencontainers/runtime-spec/specs-go" "github.com/opencontainers/selinux/go-selinux/label" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) // Runtime API constants const ( unknownPackage = "Unknown" ) // FuncTimer helps measure the execution time of a function // For debug purposes, do not leave in code // used like defer FuncTimer("foo") func FuncTimer(funcName string) { elapsed := time.Since(time.Now()) fmt.Printf("%s executed in %d ms\n", funcName, elapsed) } // MountExists returns true if dest exists in the list of mounts func MountExists(specMounts []spec.Mount, dest string) bool { for _, m := range specMounts { if m.Destination == dest { return true } } return false } // WaitForFile waits until a file has been created or the given timeout has occurred func WaitForFile(path string, chWait chan error, timeout time.Duration) (bool, error) { var inotifyEvents chan fsnotify.Event watcher, err := fsnotify.NewWatcher() if err == nil { if err := watcher.Add(filepath.Dir(path)); err == nil { inotifyEvents = watcher.Events } defer watcher.Close() } var timeoutChan <-chan time.Time if timeout != 0 { timeoutChan = time.After(timeout) } for { select { case e := <-chWait: return true, e case <-inotifyEvents: _, err := os.Stat(path) if err == nil { return false, nil } if !os.IsNotExist(err) { return false, err } case <-time.After(25 * time.Millisecond): // Check periodically for the file existence. It is needed // if the inotify watcher could not have been created. It is // also useful when using inotify as if for any reasons we missed // a notification, we won't hang the process. _, err := os.Stat(path) if err == nil { return false, nil } if !os.IsNotExist(err) { return false, err } case <-timeoutChan: return false, errors.Wrapf(define.ErrInternal, "timed out waiting for file %s", path) } } } type byDestination []spec.Mount func (m byDestination) Len() int { return len(m) } func (m byDestination) Less(i, j int) bool { return m.parts(i) < m.parts(j) } func (m byDestination) Swap(i, j int) { m[i], m[j] = m[j], m[i] } func (m byDestination) parts(i int) int { return strings.Count(filepath.Clean(m[i].Destination), string(os.PathSeparator)) } func sortMounts(m []spec.Mount) []spec.Mount { sort.Sort(byDestination(m)) return m } func validPodNSOption(p *Pod, ctrPod string) error { if p == nil { return errors.Wrapf(define.ErrInvalidArg, "pod passed in was nil. Container may not be associated with a pod") } if ctrPod == "" { return errors.Wrapf(define.ErrInvalidArg, "container is not a member of any pod") } if ctrPod != p.ID() { return errors.Wrapf(define.ErrInvalidArg, "pod passed in is not the pod the container is associated with") } return nil } // JSONDeepCopy performs a deep copy by performing a JSON encode/decode of the // given structures. From and To should be identically typed structs. func JSONDeepCopy(from, to interface{}) error { tmp, err := json.Marshal(from) if err != nil { return err } return json.Unmarshal(tmp, to) } func queryPackageVersion(cmdArg ...string) string { output := unknownPackage if 1 < len(cmdArg) { cmd := exec.Command(cmdArg[0], cmdArg[1:]...) if outp, err := cmd.Output(); err == nil { output = string(outp) } } return strings.Trim(output, "\n") } func equeryVersion(path string) string { return queryPackageVersion("/usr/bin/equery", "b", path) } func pacmanVersion(path string) string { return queryPackageVersion("/usr/bin/pacman", "-Qo", path) } func dpkgVersion(path string) string { return queryPackageVersion("/usr/bin/dpkg", "-S", path) } func rpmVersion(path string) string { return queryPackageVersion("/usr/bin/rpm", "-q", "-f", path) } func packageVersion(program string) string { if out := rpmVersion(program); out != unknownPackage { return out } if out := dpkgVersion(program); out != unknownPackage { return out } if out := pacmanVersion(program); out != unknownPackage { return out } return equeryVersion(program) } func programVersion(mountProgram string) (string, error) { output, err := utils.ExecCmd(mountProgram, "--version") if err != nil { return "", err } return strings.TrimSuffix(output, "\n"), nil } // DefaultSeccompPath returns the path to the default seccomp.json file // if it exists, first it checks OverrideSeccomp and then default. // If neither exist function returns "" func DefaultSeccompPath() (string, error) { _, err := os.Stat(config.SeccompOverridePath) if err == nil { return config.SeccompOverridePath, nil } if !os.IsNotExist(err) { return "", err } if _, err := os.Stat(config.SeccompDefaultPath); err != nil { if !os.IsNotExist(err) { return "", err } return "", nil } return config.SeccompDefaultPath, nil } // CheckDependencyContainer verifies the given container can be used as a // dependency of another container. // Both the dependency to check and the container that will be using the // dependency must be passed in. // It is assumed that ctr is locked, and depCtr is unlocked. func checkDependencyContainer(depCtr, ctr *Container) error { state, err := depCtr.State() if err != nil { return errors.Wrapf(err, "error accessing dependency container %s state", depCtr.ID()) } if state == define.ContainerStateRemoving { return errors.Wrapf(define.ErrCtrStateInvalid, "cannot use container %s as a dependency as it is being removed", depCtr.ID()) } if depCtr.ID() == ctr.ID() { return errors.Wrapf(define.ErrInvalidArg, "must specify another container") } if ctr.config.Pod != "" && depCtr.PodID() != ctr.config.Pod { return errors.Wrapf(define.ErrInvalidArg, "container has joined pod %s and dependency container %s is not a member of the pod", ctr.config.Pod, depCtr.ID()) } return nil } // hijackWriteError writes an error to a hijacked HTTP session. func hijackWriteError(toWrite error, cid string, terminal bool, httpBuf *bufio.ReadWriter) { if toWrite != nil { errString := []byte(fmt.Sprintf("Error: %v\n", toWrite)) if !terminal { // We need a header. header := makeHTTPAttachHeader(2, uint32(len(errString))) if _, err := httpBuf.Write(header); err != nil { logrus.Errorf("Error writing header for container %s attach connection error: %v", cid, err) } } if _, err := httpBuf.Write(errString); err != nil { logrus.Errorf("Error writing error to container %s HTTP attach connection: %v", cid, err) } if err := httpBuf.Flush(); err != nil { logrus.Errorf("Error flushing HTTP buffer for container %s HTTP attach connection: %v", cid, err) } } } // hijackWriteErrorAndClose writes an error to a hijacked HTTP session and // closes it. Intended to HTTPAttach function. // If error is nil, it will not be written; we'll only close the connection. func hijackWriteErrorAndClose(toWrite error, cid string, terminal bool, httpCon io.Closer, httpBuf *bufio.ReadWriter) { hijackWriteError(toWrite, cid, terminal, httpBuf) if err := httpCon.Close(); err != nil { logrus.Errorf("Error closing container %s HTTP attach connection: %v", cid, err) } } // makeHTTPAttachHeader makes an 8-byte HTTP header for a buffer of the given // length and stream. Accepts an integer indicating which stream we are sending // to (STDIN = 0, STDOUT = 1, STDERR = 2). func makeHTTPAttachHeader(stream byte, length uint32) []byte { header := make([]byte, 8) header[0] = stream binary.BigEndian.PutUint32(header[4:], length) return header } // writeHijackHeader writes a header appropriate for the type of HTTP Hijack // that occurred in a hijacked HTTP connection used for attach. func writeHijackHeader(r *http.Request, conn io.Writer) { // AttachHeader is the literal header sent for upgraded/hijacked connections for // attach, sourced from Docker at: // https://raw.githubusercontent.com/moby/moby/b95fad8e51bd064be4f4e58a996924f343846c85/api/server/router/container/container_routes.go // Using literally to ensure compatibility with existing clients. c := r.Header.Get("Connection") proto := r.Header.Get("Upgrade") if len(proto) == 0 || !strings.EqualFold(c, "Upgrade") { // OK - can't upgrade if not requested or protocol is not specified fmt.Fprintf(conn, "HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n\r\n") } else { // Upgraded fmt.Fprintf(conn, "HTTP/1.1 101 UPGRADED\r\nContent-Type: application/vnd.docker.raw-stream\r\nConnection: Upgrade\r\nUpgrade: %s\r\n\r\n", proto) } } // Convert OCICNI port bindings into Inspect-formatted port bindings. func makeInspectPortBindings(bindings []ocicni.PortMapping) map[string][]define.InspectHostPort { portBindings := make(map[string][]define.InspectHostPort) for _, port := range bindings { key := fmt.Sprintf("%d/%s", port.ContainerPort, port.Protocol) hostPorts := portBindings[key] if hostPorts == nil { hostPorts = []define.InspectHostPort{} } hostPorts = append(hostPorts, define.InspectHostPort{ HostIP: port.HostIP, HostPort: fmt.Sprintf("%d", port.HostPort), }) portBindings[key] = hostPorts } return portBindings } // Write a given string to a new file at a given path. // Will error if a file with the given name already exists. // Will be chown'd to the UID/GID provided and have the provided SELinux label // set. func writeStringToPath(path, contents, mountLabel string, uid, gid int) error { f, err := os.Create(path) if err != nil { return errors.Wrapf(err, "unable to create %s", path) } defer f.Close() if err := f.Chown(uid, gid); err != nil { return err } if _, err := f.WriteString(contents); err != nil { return errors.Wrapf(err, "unable to write %s", path) } // Relabel runDirResolv for the container if err := label.Relabel(path, mountLabel, false); err != nil { return err } return nil }