373 lines
11 KiB
Go
373 lines
11 KiB
Go
// +build linux
|
|
|
|
package libpod
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"io"
|
|
"path/filepath"
|
|
"runtime"
|
|
|
|
cnitypes "github.com/containernetworking/cni/pkg/types/current"
|
|
"github.com/containernetworking/plugins/pkg/ns"
|
|
"github.com/containers/podman/v3/libpod/define"
|
|
"github.com/containers/podman/v3/libpod/image"
|
|
"github.com/containers/podman/v3/pkg/env"
|
|
"github.com/containers/podman/v3/pkg/util"
|
|
"github.com/containers/storage/pkg/lockfile"
|
|
"github.com/hashicorp/go-multierror"
|
|
spec "github.com/opencontainers/runtime-spec/specs-go"
|
|
"github.com/opencontainers/runtime-tools/generate"
|
|
"github.com/pkg/errors"
|
|
"github.com/sirupsen/logrus"
|
|
)
|
|
|
|
// Built from ../contrib/rootless-cni-infra.
|
|
var rootlessCNIInfraImage = map[string]string{
|
|
"amd64": "quay.io/libpod/rootless-cni-infra@sha256:adf352454666f7ce9ca3e1098448b5ee18f89c4516471ec99447ec9ece917f36", // 5-amd64
|
|
}
|
|
|
|
const (
|
|
rootlessCNIInfraContainerNamespace = "podman-system"
|
|
rootlessCNIInfraContainerName = "rootless-cni-infra"
|
|
)
|
|
|
|
// AllocRootlessCNI allocates a CNI netns inside the rootless CNI infra container.
|
|
// Locks "rootless-cni-infra.lck".
|
|
//
|
|
// When the infra container is not running, it is created.
|
|
//
|
|
// AllocRootlessCNI does not lock c. c should be already locked.
|
|
func AllocRootlessCNI(ctx context.Context, c *Container) (ns.NetNS, []*cnitypes.Result, error) {
|
|
networks, _, err := c.networks()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if len(networks) == 0 {
|
|
return nil, nil, errors.New("rootless CNI networking requires that the container has joined at least one CNI network")
|
|
}
|
|
l, err := getRootlessCNIInfraLock(c.runtime)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
l.Lock()
|
|
defer l.Unlock()
|
|
infra, err := ensureRootlessCNIInfraContainerRunning(ctx, c.runtime)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
k8sPodName := getCNIPodName(c) // passed to CNI as K8S_POD_NAME
|
|
ip := ""
|
|
if c.config.StaticIP != nil {
|
|
ip = c.config.StaticIP.String()
|
|
}
|
|
mac := ""
|
|
if c.config.StaticMAC != nil {
|
|
mac = c.config.StaticMAC.String()
|
|
}
|
|
aliases, err := c.runtime.state.GetAllNetworkAliases(c)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
capArgs := ""
|
|
// add network aliases json encoded as capabilityArgs for cni
|
|
if len(aliases) > 0 {
|
|
capabilityArgs := make(map[string]interface{})
|
|
capabilityArgs["aliases"] = aliases
|
|
b, err := json.Marshal(capabilityArgs)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
capArgs = string(b)
|
|
}
|
|
|
|
cniResults := make([]*cnitypes.Result, len(networks))
|
|
for i, nw := range networks {
|
|
cniRes, err := rootlessCNIInfraCallAlloc(infra, c.ID(), nw, k8sPodName, ip, mac, capArgs)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
cniResults[i] = cniRes
|
|
}
|
|
nsObj, err := rootlessCNIInfraGetNS(infra, c.ID())
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
logrus.Debugf("rootless CNI: container %q will join %q", c.ID(), nsObj.Path())
|
|
return nsObj, cniResults, nil
|
|
}
|
|
|
|
// DeallocRootlessCNI deallocates a CNI netns inside the rootless CNI infra container.
|
|
// Locks "rootless-cni-infra.lck".
|
|
//
|
|
// When the infra container is no longer needed, it is removed.
|
|
//
|
|
// DeallocRootlessCNI does not lock c. c should be already locked.
|
|
func DeallocRootlessCNI(ctx context.Context, c *Container) error {
|
|
networks, _, err := c.networks()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(networks) == 0 {
|
|
return errors.New("rootless CNI networking requires that the container has joined at least one CNI network")
|
|
}
|
|
l, err := getRootlessCNIInfraLock(c.runtime)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
l.Lock()
|
|
defer l.Unlock()
|
|
infra, _ := getRootlessCNIInfraContainer(c.runtime)
|
|
if infra == nil {
|
|
return nil
|
|
}
|
|
var errs *multierror.Error
|
|
for _, nw := range networks {
|
|
err := rootlessCNIInfraCallDealloc(infra, c.ID(), nw)
|
|
if err != nil {
|
|
errs = multierror.Append(errs, err)
|
|
}
|
|
}
|
|
if isIdle, err := rootlessCNIInfraIsIdle(infra); isIdle || err != nil {
|
|
if err != nil {
|
|
logrus.Warn(err)
|
|
}
|
|
logrus.Debugf("rootless CNI: removing infra container %q", infra.ID())
|
|
infra.lock.Lock()
|
|
defer infra.lock.Unlock()
|
|
if err := c.runtime.removeContainer(ctx, infra, true, false, true); err != nil {
|
|
return err
|
|
}
|
|
logrus.Debugf("rootless CNI: removed infra container %q", infra.ID())
|
|
}
|
|
return errs.ErrorOrNil()
|
|
}
|
|
|
|
func getRootlessCNIInfraLock(r *Runtime) (lockfile.Locker, error) {
|
|
fname := filepath.Join(r.config.Engine.TmpDir, "rootless-cni-infra.lck")
|
|
return lockfile.GetLockfile(fname)
|
|
}
|
|
|
|
// getCNIPodName return the pod name (hostname) used by CNI and the dnsname plugin.
|
|
// If we are in the pod network namespace use the pod name otherwise the container name
|
|
func getCNIPodName(c *Container) string {
|
|
if c.config.NetMode.IsPod() || c.IsInfra() {
|
|
pod, err := c.runtime.GetPod(c.PodID())
|
|
if err == nil {
|
|
return pod.Name()
|
|
}
|
|
}
|
|
return c.Name()
|
|
}
|
|
|
|
func rootlessCNIInfraCallAlloc(infra *Container, id, nw, k8sPodName, ip, mac, capArgs string) (*cnitypes.Result, error) {
|
|
logrus.Debugf("rootless CNI: alloc %q, %q, %q, %q, %q, %q", id, nw, k8sPodName, ip, mac, capArgs)
|
|
var err error
|
|
|
|
_, err = rootlessCNIInfraExec(infra, "alloc", id, nw, k8sPodName, ip, mac, capArgs)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
cniResStr, err := rootlessCNIInfraExec(infra, "print-cni-result", id, nw)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var cniRes cnitypes.Result
|
|
if err := json.Unmarshal([]byte(cniResStr), &cniRes); err != nil {
|
|
return nil, errors.Wrapf(err, "unmarshaling as cnitypes.Result: %q", cniResStr)
|
|
}
|
|
return &cniRes, nil
|
|
}
|
|
|
|
func rootlessCNIInfraCallDealloc(infra *Container, id, nw string) error {
|
|
logrus.Debugf("rootless CNI: dealloc %q, %q", id, nw)
|
|
_, err := rootlessCNIInfraExec(infra, "dealloc", id, nw)
|
|
return err
|
|
}
|
|
|
|
func rootlessCNIInfraIsIdle(infra *Container) (bool, error) {
|
|
type isIdle struct {
|
|
Idle bool `json:"idle"`
|
|
}
|
|
resStr, err := rootlessCNIInfraExec(infra, "is-idle")
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
var res isIdle
|
|
if err := json.Unmarshal([]byte(resStr), &res); err != nil {
|
|
return false, errors.Wrapf(err, "unmarshaling as isIdle: %q", resStr)
|
|
}
|
|
return res.Idle, nil
|
|
}
|
|
|
|
func rootlessCNIInfraGetNS(infra *Container, id string) (ns.NetNS, error) {
|
|
type printNetnsPath struct {
|
|
Path string `json:"path"`
|
|
}
|
|
resStr, err := rootlessCNIInfraExec(infra, "print-netns-path", id)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var res printNetnsPath
|
|
if err := json.Unmarshal([]byte(resStr), &res); err != nil {
|
|
return nil, errors.Wrapf(err, "unmarshaling as printNetnsPath: %q", resStr)
|
|
}
|
|
nsObj, err := ns.GetNS(res.Path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return nsObj, nil
|
|
}
|
|
|
|
func getRootlessCNIInfraContainer(r *Runtime) (*Container, error) {
|
|
containers, err := r.GetContainersWithoutLock(func(c *Container) bool {
|
|
return c.Namespace() == rootlessCNIInfraContainerNamespace &&
|
|
c.Name() == rootlessCNIInfraContainerName
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(containers) == 0 {
|
|
return nil, nil
|
|
}
|
|
return containers[0], nil
|
|
}
|
|
|
|
func ensureRootlessCNIInfraContainerRunning(ctx context.Context, r *Runtime) (*Container, error) {
|
|
c, err := getRootlessCNIInfraContainer(r)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if c == nil {
|
|
return startRootlessCNIInfraContainer(ctx, r)
|
|
}
|
|
st, err := c.ContainerState()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if st.State == define.ContainerStateRunning {
|
|
logrus.Debugf("rootless CNI: infra container %q is already running", c.ID())
|
|
return c, nil
|
|
}
|
|
logrus.Debugf("rootless CNI: infra container %q is %q, being started", c.ID(), st.State)
|
|
if err := c.initAndStart(ctx); err != nil {
|
|
return nil, err
|
|
}
|
|
logrus.Debugf("rootless CNI: infra container %q is running", c.ID())
|
|
return c, nil
|
|
}
|
|
|
|
func startRootlessCNIInfraContainer(ctx context.Context, r *Runtime) (*Container, error) {
|
|
imageName, ok := rootlessCNIInfraImage[runtime.GOARCH]
|
|
if !ok {
|
|
return nil, errors.Errorf("cannot find rootless-podman-network-sandbox image for %s", runtime.GOARCH)
|
|
}
|
|
logrus.Debugf("rootless CNI: ensuring image %q to exist", imageName)
|
|
newImage, err := r.ImageRuntime().New(ctx, imageName, "", "", nil, nil,
|
|
image.SigningOptions{}, nil, util.PullImageMissing, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
logrus.Debugf("rootless CNI: image %q is ready", imageName)
|
|
|
|
g, err := generate.New("linux")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
g.SetupPrivileged(true)
|
|
// Set --pid=host for ease of propagating "/proc/PID/ns/net" string
|
|
if err := g.RemoveLinuxNamespace(string(spec.PIDNamespace)); err != nil {
|
|
return nil, err
|
|
}
|
|
g.RemoveMount("/proc")
|
|
procMount := spec.Mount{
|
|
Destination: "/proc",
|
|
Type: "bind",
|
|
Source: "/proc",
|
|
Options: []string{"rbind", "nosuid", "noexec", "nodev"},
|
|
}
|
|
g.AddMount(procMount)
|
|
// Mount CNI networks
|
|
etcCNINetD := spec.Mount{
|
|
Destination: "/etc/cni/net.d",
|
|
Type: "bind",
|
|
Source: r.config.Network.NetworkConfigDir,
|
|
Options: []string{"ro", "bind"},
|
|
}
|
|
g.AddMount(etcCNINetD)
|
|
|
|
inspectData, err := newImage.Inspect(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
imageEnv, err := env.ParseSlice(inspectData.Config.Env)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for k, v := range imageEnv {
|
|
g.AddProcessEnv(k, v)
|
|
}
|
|
if len(inspectData.Config.Cmd) == 0 {
|
|
return nil, errors.Errorf("rootless CNI infra image %q has no command specified", imageName)
|
|
}
|
|
g.SetProcessArgs(inspectData.Config.Cmd)
|
|
|
|
var options []CtrCreateOption
|
|
options = append(options, WithRootFSFromImage(newImage.ID(), imageName, imageName))
|
|
options = append(options, WithCtrNamespace(rootlessCNIInfraContainerNamespace))
|
|
options = append(options, WithName(rootlessCNIInfraContainerName))
|
|
options = append(options, WithPrivileged(true))
|
|
options = append(options, WithSecLabels([]string{"disable"}))
|
|
options = append(options, WithRestartPolicy("always"))
|
|
options = append(options, WithNetNS(nil, false, "slirp4netns", nil))
|
|
c, err := r.NewContainer(ctx, g.Config, options...)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
logrus.Debugf("rootless CNI infra container %q is created, now being started", c.ID())
|
|
if err := c.initAndStart(ctx); err != nil {
|
|
return nil, err
|
|
}
|
|
logrus.Debugf("rootless CNI: infra container %q is running", c.ID())
|
|
|
|
return c, nil
|
|
}
|
|
|
|
func rootlessCNIInfraExec(c *Container, args ...string) (string, error) {
|
|
cmd := "rootless-cni-infra"
|
|
var (
|
|
outB bytes.Buffer
|
|
errB bytes.Buffer
|
|
streams define.AttachStreams
|
|
config ExecConfig
|
|
)
|
|
streams.OutputStream = &nopWriteCloser{Writer: &outB}
|
|
streams.ErrorStream = &nopWriteCloser{Writer: &errB}
|
|
streams.AttachOutput = true
|
|
streams.AttachError = true
|
|
config.Command = append([]string{cmd}, args...)
|
|
config.Privileged = true
|
|
logrus.Debugf("rootlessCNIInfraExec: c.ID()=%s, config=%+v, streams=%v, begin",
|
|
c.ID(), config, streams)
|
|
code, err := c.Exec(&config, &streams, nil)
|
|
logrus.Debugf("rootlessCNIInfraExec: c.ID()=%s, config=%+v, streams=%v, end (code=%d, err=%v)",
|
|
c.ID(), config, streams, code, err)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
if code != 0 {
|
|
return "", errors.Errorf("command %s %v in container %s failed with status %d, stdout=%q, stderr=%q",
|
|
cmd, args, c.ID(), code, outB.String(), errB.String())
|
|
}
|
|
return outB.String(), nil
|
|
}
|
|
|
|
type nopWriteCloser struct {
|
|
io.Writer
|
|
}
|
|
|
|
func (nwc *nopWriteCloser) Close() error {
|
|
return nil
|
|
}
|