mirror of
https://github.com/containers/podman
synced 2024-10-21 09:45:32 +00:00
347 lines
10 KiB
Go
347 lines
10 KiB
Go
// +build linux
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package libpod
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import (
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"bytes"
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"context"
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"io"
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"path/filepath"
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"runtime"
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cnitypes "github.com/containernetworking/cni/pkg/types/current"
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"github.com/containernetworking/plugins/pkg/ns"
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"github.com/containers/podman/v2/libpod/define"
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"github.com/containers/podman/v2/libpod/image"
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"github.com/containers/podman/v2/pkg/env"
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"github.com/containers/podman/v2/pkg/util"
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"github.com/containers/storage/pkg/lockfile"
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"github.com/hashicorp/go-multierror"
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spec "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/opencontainers/runtime-tools/generate"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// Built from ../contrib/rootless-cni-infra.
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var rootlessCNIInfraImage = map[string]string{
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"amd64": "quay.io/libpod/rootless-cni-infra@sha256:304742d5d221211df4ec672807a5842ff11e3729c50bc424ea0cea858f69d7b7", // 3-amd64
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}
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const (
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rootlessCNIInfraContainerNamespace = "podman-system"
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rootlessCNIInfraContainerName = "rootless-cni-infra"
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)
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// AllocRootlessCNI allocates a CNI netns inside the rootless CNI infra container.
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// Locks "rootless-cni-infra.lck".
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//
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// When the infra container is not running, it is created.
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//
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// AllocRootlessCNI does not lock c. c should be already locked.
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func AllocRootlessCNI(ctx context.Context, c *Container) (ns.NetNS, []*cnitypes.Result, error) {
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networks, _, err := c.networks()
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if err != nil {
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return nil, nil, err
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}
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if len(networks) == 0 {
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return nil, nil, errors.New("rootless CNI networking requires that the container has joined at least one CNI network")
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}
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l, err := getRootlessCNIInfraLock(c.runtime)
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if err != nil {
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return nil, nil, err
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}
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l.Lock()
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defer l.Unlock()
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infra, err := ensureRootlessCNIInfraContainerRunning(ctx, c.runtime)
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if err != nil {
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return nil, nil, err
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}
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k8sPodName := getCNIPodName(c) // passed to CNI as K8S_POD_NAME
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cniResults := make([]*cnitypes.Result, len(networks))
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for i, nw := range networks {
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cniRes, err := rootlessCNIInfraCallAlloc(infra, c.ID(), nw, k8sPodName)
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if err != nil {
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return nil, nil, err
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}
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cniResults[i] = cniRes
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}
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nsObj, err := rootlessCNIInfraGetNS(infra, c.ID())
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if err != nil {
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return nil, nil, err
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}
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logrus.Debugf("rootless CNI: container %q will join %q", c.ID(), nsObj.Path())
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return nsObj, cniResults, nil
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}
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// DeallocRootlessCNI deallocates a CNI netns inside the rootless CNI infra container.
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// Locks "rootless-cni-infra.lck".
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//
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// When the infra container is no longer needed, it is removed.
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//
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// DeallocRootlessCNI does not lock c. c should be already locked.
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func DeallocRootlessCNI(ctx context.Context, c *Container) error {
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networks, _, err := c.networks()
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if err != nil {
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return err
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}
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if len(networks) == 0 {
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return errors.New("rootless CNI networking requires that the container has joined at least one CNI network")
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}
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l, err := getRootlessCNIInfraLock(c.runtime)
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if err != nil {
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return err
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}
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l.Lock()
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defer l.Unlock()
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infra, _ := getRootlessCNIInfraContainer(c.runtime)
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if infra == nil {
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return nil
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}
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var errs *multierror.Error
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for _, nw := range networks {
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err := rootlessCNIInfraCallDealloc(infra, c.ID(), nw)
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if err != nil {
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errs = multierror.Append(errs, err)
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}
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}
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if isIdle, err := rootlessCNIInfraIsIdle(infra); isIdle || err != nil {
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if err != nil {
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logrus.Warn(err)
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}
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logrus.Debugf("rootless CNI: removing infra container %q", infra.ID())
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if err := c.runtime.removeContainer(ctx, infra, true, false, true); err != nil {
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return err
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}
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logrus.Debugf("rootless CNI: removed infra container %q", infra.ID())
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}
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return errs.ErrorOrNil()
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}
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func getRootlessCNIInfraLock(r *Runtime) (lockfile.Locker, error) {
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fname := filepath.Join(r.config.Engine.TmpDir, "rootless-cni-infra.lck")
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return lockfile.GetLockfile(fname)
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}
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// getCNIPodName return the pod name (hostname) used by CNI and the dnsname plugin.
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// If we are in the pod network namespace use the pod name otherwise the container name
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func getCNIPodName(c *Container) string {
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if c.config.NetMode.IsPod() || c.IsInfra() {
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pod, err := c.runtime.GetPod(c.PodID())
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if err == nil {
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return pod.Name()
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}
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}
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return c.Name()
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}
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func rootlessCNIInfraCallAlloc(infra *Container, id, nw, k8sPodName string) (*cnitypes.Result, error) {
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logrus.Debugf("rootless CNI: alloc %q, %q, %q", id, nw, k8sPodName)
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var err error
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_, err = rootlessCNIInfraExec(infra, "alloc", id, nw, k8sPodName)
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if err != nil {
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return nil, err
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}
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cniResStr, err := rootlessCNIInfraExec(infra, "print-cni-result", id, nw)
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if err != nil {
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return nil, err
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}
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var cniRes cnitypes.Result
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if err := json.Unmarshal([]byte(cniResStr), &cniRes); err != nil {
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return nil, errors.Wrapf(err, "unmarshaling as cnitypes.Result: %q", cniResStr)
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}
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return &cniRes, nil
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}
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func rootlessCNIInfraCallDealloc(infra *Container, id, nw string) error {
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logrus.Debugf("rootless CNI: dealloc %q, %q", id, nw)
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_, err := rootlessCNIInfraExec(infra, "dealloc", id, nw)
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return err
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}
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func rootlessCNIInfraIsIdle(infra *Container) (bool, error) {
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type isIdle struct {
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Idle bool `json:"idle"`
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}
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resStr, err := rootlessCNIInfraExec(infra, "is-idle")
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if err != nil {
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return false, err
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}
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var res isIdle
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if err := json.Unmarshal([]byte(resStr), &res); err != nil {
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return false, errors.Wrapf(err, "unmarshaling as isIdle: %q", resStr)
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}
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return res.Idle, nil
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}
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func rootlessCNIInfraGetNS(infra *Container, id string) (ns.NetNS, error) {
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type printNetnsPath struct {
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Path string `json:"path"`
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}
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resStr, err := rootlessCNIInfraExec(infra, "print-netns-path", id)
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if err != nil {
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return nil, err
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}
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var res printNetnsPath
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if err := json.Unmarshal([]byte(resStr), &res); err != nil {
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return nil, errors.Wrapf(err, "unmarshaling as printNetnsPath: %q", resStr)
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}
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nsObj, err := ns.GetNS(res.Path)
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if err != nil {
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return nil, err
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}
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return nsObj, nil
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}
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func getRootlessCNIInfraContainer(r *Runtime) (*Container, error) {
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containers, err := r.GetContainersWithoutLock(func(c *Container) bool {
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return c.Namespace() == rootlessCNIInfraContainerNamespace &&
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c.Name() == rootlessCNIInfraContainerName
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})
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if err != nil {
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return nil, err
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}
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if len(containers) == 0 {
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return nil, nil
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}
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return containers[0], nil
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}
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func ensureRootlessCNIInfraContainerRunning(ctx context.Context, r *Runtime) (*Container, error) {
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c, err := getRootlessCNIInfraContainer(r)
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if err != nil {
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return nil, err
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}
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if c == nil {
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return startRootlessCNIInfraContainer(ctx, r)
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}
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st, err := c.ContainerState()
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if err != nil {
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return nil, err
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}
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if st.State == define.ContainerStateRunning {
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logrus.Debugf("rootless CNI: infra container %q is already running", c.ID())
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return c, nil
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}
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logrus.Debugf("rootless CNI: infra container %q is %q, being started", c.ID(), st.State)
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if err := c.initAndStart(ctx); err != nil {
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return nil, err
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}
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logrus.Debugf("rootless CNI: infra container %q is running", c.ID())
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return c, nil
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}
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func startRootlessCNIInfraContainer(ctx context.Context, r *Runtime) (*Container, error) {
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imageName, ok := rootlessCNIInfraImage[runtime.GOARCH]
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if !ok {
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return nil, errors.Errorf("cannot find rootless-podman-network-sandbox image for %s", runtime.GOARCH)
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}
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logrus.Debugf("rootless CNI: ensuring image %q to exist", imageName)
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newImage, err := r.ImageRuntime().New(ctx, imageName, "", "", nil, nil,
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image.SigningOptions{}, nil, util.PullImageMissing)
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if err != nil {
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return nil, err
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}
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logrus.Debugf("rootless CNI: image %q is ready", imageName)
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g, err := generate.New("linux")
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if err != nil {
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return nil, err
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}
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g.SetupPrivileged(true)
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// Set --pid=host for ease of propagating "/proc/PID/ns/net" string
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if err := g.RemoveLinuxNamespace(string(spec.PIDNamespace)); err != nil {
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return nil, err
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}
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g.RemoveMount("/proc")
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procMount := spec.Mount{
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Destination: "/proc",
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Type: "bind",
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Source: "/proc",
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Options: []string{"rbind", "nosuid", "noexec", "nodev"},
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}
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g.AddMount(procMount)
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// Mount CNI networks
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etcCNINetD := spec.Mount{
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Destination: "/etc/cni/net.d",
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Type: "bind",
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Source: r.config.Network.NetworkConfigDir,
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Options: []string{"ro", "bind"},
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}
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g.AddMount(etcCNINetD)
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inspectData, err := newImage.Inspect(ctx)
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if err != nil {
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return nil, err
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}
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imageEnv, err := env.ParseSlice(inspectData.Config.Env)
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if err != nil {
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return nil, err
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}
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for k, v := range imageEnv {
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g.AddProcessEnv(k, v)
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}
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if len(inspectData.Config.Cmd) == 0 {
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return nil, errors.Errorf("rootless CNI infra image %q has no command specified", imageName)
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}
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g.SetProcessArgs(inspectData.Config.Cmd)
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var options []CtrCreateOption
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options = append(options, WithRootFSFromImage(newImage.ID(), imageName, imageName))
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options = append(options, WithCtrNamespace(rootlessCNIInfraContainerNamespace))
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options = append(options, WithName(rootlessCNIInfraContainerName))
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options = append(options, WithPrivileged(true))
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options = append(options, WithSecLabels([]string{"disable"}))
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options = append(options, WithRestartPolicy("always"))
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options = append(options, WithNetNS(nil, false, "slirp4netns", nil))
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c, err := r.NewContainer(ctx, g.Config, options...)
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if err != nil {
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return nil, err
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}
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logrus.Debugf("rootless CNI infra container %q is created, now being started", c.ID())
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if err := c.initAndStart(ctx); err != nil {
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return nil, err
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}
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logrus.Debugf("rootless CNI: infra container %q is running", c.ID())
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return c, nil
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}
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func rootlessCNIInfraExec(c *Container, args ...string) (string, error) {
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cmd := "rootless-cni-infra"
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var (
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outB bytes.Buffer
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errB bytes.Buffer
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streams define.AttachStreams
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config ExecConfig
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)
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streams.OutputStream = &nopWriteCloser{Writer: &outB}
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streams.ErrorStream = &nopWriteCloser{Writer: &errB}
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streams.AttachOutput = true
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streams.AttachError = true
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config.Command = append([]string{cmd}, args...)
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config.Privileged = true
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logrus.Debugf("rootlessCNIInfraExec: c.ID()=%s, config=%+v, streams=%v, begin",
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c.ID(), config, streams)
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code, err := c.Exec(&config, &streams, nil)
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logrus.Debugf("rootlessCNIInfraExec: c.ID()=%s, config=%+v, streams=%v, end (code=%d, err=%v)",
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c.ID(), config, streams, code, err)
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if err != nil {
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return "", err
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}
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if code != 0 {
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return "", errors.Errorf("command %s %v in container %s failed with status %d, stdout=%q, stderr=%q",
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cmd, args, c.ID(), code, outB.String(), errB.String())
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}
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return outB.String(), nil
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}
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type nopWriteCloser struct {
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io.Writer
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}
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func (nwc *nopWriteCloser) Close() error {
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return nil
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}
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