/
utils.go
281 lines (249 loc) · 6.84 KB
/
utils.go
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package server
import (
"fmt"
"io"
"os"
"strings"
"time"
"github.com/cri-o/cri-o/lib/sandbox"
"github.com/cri-o/cri-o/server/metrics"
"github.com/cri-o/ocicni/pkg/ocicni"
units "github.com/docker/go-units"
v1 "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/opencontainers/runtime-tools/validate"
"github.com/pkg/errors"
"github.com/syndtr/gocapability/capability"
pb "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
"k8s.io/kubernetes/pkg/kubelet/types"
)
const (
// According to http://man7.org/linux/man-pages/man5/resolv.conf.5.html:
// "The search list is currently limited to six domains with a total of 256 characters."
maxDNSSearches = 6
maxLabelSize = 4096
)
func copyFile(src, dest string) error {
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dest)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, in)
return err
}
func removeFile(path string) error {
if _, err := os.Stat(path); err == nil {
if err := os.Remove(path); err != nil {
return err
}
}
return nil
}
func parseDNSOptions(servers, searches, options []string, path string) error {
nServers := len(servers)
nSearches := len(searches)
nOptions := len(options)
if nServers == 0 && nSearches == 0 && nOptions == 0 {
return copyFile("/etc/resolv.conf", path)
}
if nSearches > maxDNSSearches {
return fmt.Errorf("DNSOption.Searches has more than 6 domains")
}
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
if nSearches > 0 {
data := fmt.Sprintf("search %s\n", strings.Join(searches, " "))
_, err = f.Write([]byte(data))
if err != nil {
return err
}
}
if nServers > 0 {
data := fmt.Sprintf("nameserver %s\n", strings.Join(servers, "\nnameserver "))
_, err = f.Write([]byte(data))
if err != nil {
return err
}
}
if nOptions > 0 {
data := fmt.Sprintf("options %s\n", strings.Join(options, " "))
_, err = f.Write([]byte(data))
if err != nil {
return err
}
}
return nil
}
func newPodNetwork(sb *sandbox.Sandbox) ocicni.PodNetwork {
return ocicni.PodNetwork{
Name: sb.KubeName(),
Namespace: sb.Namespace(),
Networks: make([]ocicni.NetAttachment, 0),
ID: sb.ID(),
NetNS: sb.NetNsPath(),
}
}
// inStringSlice checks whether a string is inside a string slice.
// Comparison is case insensitive.
func inStringSlice(ss []string, str string) bool {
for _, s := range ss {
if strings.EqualFold(s, str) {
return true
}
}
return false
}
// getOCICapabilitiesList returns a list of all available capabilities.
func getOCICapabilitiesList() []string {
caps := make([]string, 0, len(capability.List()))
for _, cap := range capability.List() {
if cap > validate.LastCap() {
continue
}
caps = append(caps, "CAP_"+strings.ToUpper(cap.String()))
}
return caps
}
func recordOperation(operation string, start time.Time) {
metrics.CRIOOperations.WithLabelValues(operation).Inc()
metrics.CRIOOperationsLatency.WithLabelValues(operation).Observe(metrics.SinceInMicroseconds(start))
}
// recordError records error for metric if an error occurred.
func recordError(operation string, err error) {
if err != nil {
// TODO(runcom): handle timeout from ctx as well
metrics.CRIOOperationsErrors.WithLabelValues(operation).Inc()
}
}
func validateLabels(labels map[string]string) error {
for k, v := range labels {
if (len(k) + len(v)) > maxLabelSize {
if len(k) > 10 {
k = k[:10]
}
return fmt.Errorf("label key and value greater than maximum size (%d bytes), key: %s", maxLabelSize, k)
}
}
return nil
}
func mergeEnvs(imageConfig *v1.Image, kubeEnvs []*pb.KeyValue) []string {
envs := []string{}
if kubeEnvs == nil && imageConfig != nil {
envs = imageConfig.Config.Env
} else {
for _, item := range kubeEnvs {
if item.GetKey() == "" {
continue
}
envs = append(envs, item.GetKey()+"="+item.GetValue())
}
if imageConfig != nil {
for _, imageEnv := range imageConfig.Config.Env {
var found bool
parts := strings.SplitN(imageEnv, "=", 2)
if len(parts) != 2 {
continue
}
imageEnvKey := parts[0]
if imageEnvKey == "" {
continue
}
for _, kubeEnv := range envs {
kubeEnvKey := strings.SplitN(kubeEnv, "=", 2)[0]
if kubeEnvKey == "" {
continue
}
if imageEnvKey == kubeEnvKey {
found = true
break
}
}
if !found {
envs = append(envs, imageEnv)
}
}
}
}
return envs
}
// Namespace represents a kernel namespace name.
type Namespace string
const (
// IpcNamespace is the Linux IPC namespace
IpcNamespace = Namespace("ipc")
// NetNamespace is the network namespace
NetNamespace = Namespace("net")
// UnknownNamespace is the zero value if no namespace is known
UnknownNamespace = Namespace("")
)
var namespaces = map[string]Namespace{
"kernel.sem": IpcNamespace,
}
var prefixNamespaces = map[string]Namespace{
"kernel.shm": IpcNamespace,
"kernel.msg": IpcNamespace,
"fs.mqueue.": IpcNamespace,
"net.": NetNamespace,
}
// validateSysctl checks that a sysctl is whitelisted because it is known
// to be namespaced by the Linux kernel.
// The parameters hostNet and hostIPC are used to forbid sysctls for pod sharing the
// respective namespaces with the host. This check is only used on sysctls defined by
// the user in the crio.conf file.
func validateSysctl(sysctl string, hostNet, hostIPC bool) error {
nsErrorFmt := "%q not allowed with host %s enabled"
if ns, found := namespaces[sysctl]; found {
if ns == IpcNamespace && hostIPC {
return errors.Errorf(nsErrorFmt, sysctl, ns)
}
if ns == NetNamespace && hostNet {
return errors.Errorf(nsErrorFmt, sysctl, ns)
}
return nil
}
for p, ns := range prefixNamespaces {
if strings.HasPrefix(sysctl, p) {
if ns == IpcNamespace && hostIPC {
return errors.Errorf(nsErrorFmt, sysctl, ns)
}
if ns == NetNamespace && hostNet {
return errors.Errorf(nsErrorFmt, sysctl, ns)
}
return nil
}
}
return errors.Errorf("%q not whitelisted", sysctl)
}
type ulimit struct {
name string
hard uint64
soft uint64
}
func getUlimitsFromConfig(config Config) ([]ulimit, error) {
ulimits := make([]ulimit, 0, len(config.RuntimeConfig.DefaultUlimits))
for _, u := range config.RuntimeConfig.DefaultUlimits {
ul, err := units.ParseUlimit(u)
if err != nil {
return nil, err
}
rl, err := ul.GetRlimit()
if err != nil {
return nil, err
}
// This sucks, but it's the runtime-tools interface
ulimits = append(ulimits, ulimit{name: "RLIMIT_" + strings.ToUpper(ul.Name), hard: rl.Hard, soft: rl.Soft})
}
return ulimits, nil
}
// Translate container labels to a description of the container
func translateLabelsToDescription(labels map[string]string) string {
return fmt.Sprintf("%s/%s/%s", labels[types.KubernetesPodNamespaceLabel], labels[types.KubernetesPodNameLabel], labels[types.KubernetesContainerNameLabel])
}