mirror of
https://github.com/kubeshark/kubeshark.git
synced 2025-06-02 21:21:02 +00:00
456 lines
16 KiB
Go
456 lines
16 KiB
Go
package cmd
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import (
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"context"
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"errors"
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"fmt"
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"log"
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"regexp"
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"strings"
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"time"
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"github.com/kubeshark/kubeshark/internal/connect"
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"github.com/kubeshark/kubeshark/resources"
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"github.com/kubeshark/kubeshark/utils"
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core "k8s.io/api/core/v1"
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k8serrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"github.com/kubeshark/kubeshark/cmd/goUtils"
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"github.com/kubeshark/kubeshark/config"
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"github.com/kubeshark/kubeshark/config/configStructs"
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"github.com/kubeshark/kubeshark/errormessage"
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"github.com/kubeshark/kubeshark/kubernetes"
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"github.com/kubeshark/worker/api"
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"github.com/kubeshark/worker/models"
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)
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const cleanupTimeout = time.Minute
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type tapState struct {
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startTime time.Time
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targetNamespaces []string
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kubesharkServiceAccountExists bool
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}
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var state tapState
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var connector *connect.Connector
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var hubPodReady bool
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var frontPodReady bool
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var proxyDone bool
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func RunKubesharkTap() {
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state.startTime = time.Now()
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connector = connect.NewConnector(kubernetes.GetLocalhostOnPort(config.Config.Hub.PortForward.SrcPort), connect.DefaultRetries, connect.DefaultTimeout)
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kubernetesProvider, err := getKubernetesProviderForCli()
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if err != nil {
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return
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel() // cancel will be called when this function exits
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state.targetNamespaces = getNamespaces(kubernetesProvider)
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kubesharkAgentConfig := getTapKubesharkAgentConfig()
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serializedKubesharkConfig, err := getSerializedKubesharkAgentConfig(kubesharkAgentConfig)
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if err != nil {
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log.Printf(utils.Error, fmt.Sprintf("Error serializing kubeshark config: %v", errormessage.FormatError(err)))
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return
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}
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if config.Config.IsNsRestrictedMode() {
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if len(state.targetNamespaces) != 1 || !utils.Contains(state.targetNamespaces, config.Config.KubesharkResourcesNamespace) {
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log.Printf("Not supported mode. Kubeshark can't resolve IPs in other namespaces when running in namespace restricted mode.\n"+
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"You can use the same namespace for --%s and --%s", configStructs.NamespacesTapName, config.KubesharkResourcesNamespaceConfigName)
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return
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}
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}
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var namespacesStr string
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if !utils.Contains(state.targetNamespaces, kubernetes.K8sAllNamespaces) {
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namespacesStr = fmt.Sprintf("namespaces \"%s\"", strings.Join(state.targetNamespaces, "\", \""))
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} else {
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namespacesStr = "all namespaces"
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}
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log.Printf("Tapping pods in %s", namespacesStr)
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if err := printTappedPodsPreview(ctx, kubernetesProvider, state.targetNamespaces); err != nil {
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log.Printf(utils.Error, fmt.Sprintf("Error listing pods: %v", errormessage.FormatError(err)))
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}
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if config.Config.Tap.DryRun {
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return
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}
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log.Printf("Waiting for Kubeshark Agent to start...")
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if state.kubesharkServiceAccountExists, err = resources.CreateTapKubesharkResources(ctx, kubernetesProvider, serializedKubesharkConfig, config.Config.IsNsRestrictedMode(), config.Config.KubesharkResourcesNamespace, config.Config.AgentImage, config.Config.Tap.MaxEntriesDBSizeBytes(), config.Config.Tap.HubResources, config.Config.ImagePullPolicy(), config.Config.LogLevel(), config.Config.Tap.Profiler); err != nil {
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var statusError *k8serrors.StatusError
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if errors.As(err, &statusError) && (statusError.ErrStatus.Reason == metav1.StatusReasonAlreadyExists) {
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log.Print("Kubeshark is already running in this namespace, change the `kubeshark-resources-namespace` configuration or run `kubeshark clean` to remove the currently running Kubeshark instance")
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} else {
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defer resources.CleanUpKubesharkResources(ctx, cancel, kubernetesProvider, config.Config.IsNsRestrictedMode(), config.Config.KubesharkResourcesNamespace)
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log.Printf(utils.Error, fmt.Sprintf("Error creating resources: %v", errormessage.FormatError(err)))
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}
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return
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}
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defer finishTapExecution(kubernetesProvider)
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go goUtils.HandleExcWrapper(watchHubEvents, ctx, kubernetesProvider, cancel)
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go goUtils.HandleExcWrapper(watchHubPod, ctx, kubernetesProvider, cancel)
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go goUtils.HandleExcWrapper(watchFrontPod, ctx, kubernetesProvider, cancel)
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// block until exit signal or error
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utils.WaitForFinish(ctx, cancel)
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}
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func finishTapExecution(kubernetesProvider *kubernetes.Provider) {
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finishKubesharkExecution(kubernetesProvider, config.Config.IsNsRestrictedMode(), config.Config.KubesharkResourcesNamespace)
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}
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func getTapKubesharkAgentConfig() *models.Config {
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kubesharkAgentConfig := models.Config{
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MaxDBSizeBytes: config.Config.Tap.MaxEntriesDBSizeBytes(),
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InsertionFilter: config.Config.Tap.GetInsertionFilter(),
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AgentImage: config.Config.AgentImage,
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PullPolicy: config.Config.ImagePullPolicyStr,
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LogLevel: config.Config.LogLevel(),
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TapperResources: config.Config.Tap.TapperResources,
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KubesharkResourcesNamespace: config.Config.KubesharkResourcesNamespace,
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AgentDatabasePath: models.DataDirPath,
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ServiceMap: config.Config.ServiceMap,
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OAS: config.Config.OAS,
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}
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return &kubesharkAgentConfig
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}
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/*
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this function is a bit problematic as it might be detached from the actual pods the Kubeshark Hub will tap.
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The alternative would be to wait for Hub to be ready and then query it for the pods it listens to, this has
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the arguably worse drawback of taking a relatively very long time before the user sees which pods are targeted, if any.
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*/
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func printTappedPodsPreview(ctx context.Context, kubernetesProvider *kubernetes.Provider, namespaces []string) error {
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if matchingPods, err := kubernetesProvider.ListAllRunningPodsMatchingRegex(ctx, config.Config.Tap.PodRegex(), namespaces); err != nil {
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return err
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} else {
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if len(matchingPods) == 0 {
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printNoPodsFoundSuggestion(namespaces)
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}
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for _, tappedPod := range matchingPods {
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log.Printf(utils.Green, fmt.Sprintf("+%s", tappedPod.Name))
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}
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return nil
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}
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}
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func startTapperSyncer(ctx context.Context, cancel context.CancelFunc, provider *kubernetes.Provider, targetNamespaces []string, startTime time.Time) error {
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tapperSyncer, err := kubernetes.CreateAndStartKubesharkTapperSyncer(ctx, provider, kubernetes.TapperSyncerConfig{
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TargetNamespaces: targetNamespaces,
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PodFilterRegex: *config.Config.Tap.PodRegex(),
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KubesharkResourcesNamespace: config.Config.KubesharkResourcesNamespace,
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AgentImage: config.Config.AgentImage,
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TapperResources: config.Config.Tap.TapperResources,
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ImagePullPolicy: config.Config.ImagePullPolicy(),
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LogLevel: config.Config.LogLevel(),
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KubesharkApiFilteringOptions: api.TrafficFilteringOptions{
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IgnoredUserAgents: config.Config.Tap.IgnoredUserAgents,
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},
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KubesharkServiceAccountExists: state.kubesharkServiceAccountExists,
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ServiceMesh: config.Config.Tap.ServiceMesh,
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Tls: config.Config.Tap.Tls,
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MaxLiveStreams: config.Config.Tap.MaxLiveStreams,
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}, startTime)
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if err != nil {
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return err
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}
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go func() {
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for {
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select {
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case syncerErr, ok := <-tapperSyncer.ErrorOut:
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if !ok {
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log.Print("kubesharkTapperSyncer err channel closed, ending listener loop")
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return
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}
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log.Printf(utils.Error, getErrorDisplayTextForK8sTapManagerError(syncerErr))
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cancel()
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case _, ok := <-tapperSyncer.TapPodChangesOut:
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if !ok {
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log.Print("kubesharkTapperSyncer pod changes channel closed, ending listener loop")
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return
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}
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if err := connector.ReportTappedPods(tapperSyncer.CurrentlyTappedPods); err != nil {
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log.Printf("[Error] failed update tapped pods %v", err)
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}
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case tapperStatus, ok := <-tapperSyncer.TapperStatusChangedOut:
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if !ok {
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log.Print("kubesharkTapperSyncer tapper status changed channel closed, ending listener loop")
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return
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}
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if err := connector.ReportTapperStatus(tapperStatus); err != nil {
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log.Printf("[Error] failed update tapper status %v", err)
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}
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case <-ctx.Done():
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log.Print("kubesharkTapperSyncer event listener loop exiting due to context done")
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return
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}
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}
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}()
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return nil
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}
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func printNoPodsFoundSuggestion(targetNamespaces []string) {
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var suggestionStr string
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if !utils.Contains(targetNamespaces, kubernetes.K8sAllNamespaces) {
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suggestionStr = ". You can also try selecting a different namespace with -n or tap all namespaces with -A"
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}
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log.Printf(utils.Warning, fmt.Sprintf("Did not find any currently running pods that match the regex argument, kubeshark will automatically tap matching pods if any are created later%s", suggestionStr))
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}
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func getErrorDisplayTextForK8sTapManagerError(err kubernetes.K8sTapManagerError) string {
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switch err.TapManagerReason {
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case kubernetes.TapManagerPodListError:
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return fmt.Sprintf("Failed to update currently tapped pods: %v", err.OriginalError)
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case kubernetes.TapManagerPodWatchError:
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return fmt.Sprintf("Error occured in k8s pod watch: %v", err.OriginalError)
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case kubernetes.TapManagerTapperUpdateError:
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return fmt.Sprintf("Error updating tappers: %v", err.OriginalError)
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default:
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return fmt.Sprintf("Unknown error occured in k8s tap manager: %v", err.OriginalError)
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}
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}
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func watchHubPod(ctx context.Context, kubernetesProvider *kubernetes.Provider, cancel context.CancelFunc) {
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podExactRegex := regexp.MustCompile(fmt.Sprintf("^%s$", kubernetes.HubPodName))
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podWatchHelper := kubernetes.NewPodWatchHelper(kubernetesProvider, podExactRegex)
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eventChan, errorChan := kubernetes.FilteredWatch(ctx, podWatchHelper, []string{config.Config.KubesharkResourcesNamespace}, podWatchHelper)
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isPodReady := false
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hubTimeoutSec := config.GetIntEnvConfig(config.HubTimeoutSec, 120)
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timeAfter := time.After(time.Duration(hubTimeoutSec) * time.Second)
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for {
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select {
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case wEvent, ok := <-eventChan:
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if !ok {
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eventChan = nil
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continue
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}
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switch wEvent.Type {
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case kubernetes.EventAdded:
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log.Printf("Watching Hub pod loop, added")
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case kubernetes.EventDeleted:
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log.Printf("%s removed", kubernetes.HubPodName)
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cancel()
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return
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case kubernetes.EventModified:
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modifiedPod, err := wEvent.ToPod()
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if err != nil {
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log.Printf(utils.Error, err)
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cancel()
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continue
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}
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log.Printf("Watching Hub pod loop, modified: %v, containers statuses: %v", modifiedPod.Status.Phase, modifiedPod.Status.ContainerStatuses)
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if modifiedPod.Status.Phase == core.PodRunning && !isPodReady {
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isPodReady = true
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hubPodReady = true
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postHubStarted(ctx, kubernetesProvider, cancel)
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}
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if !proxyDone && hubPodReady && frontPodReady {
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proxyDone = true
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postFrontStarted(ctx, kubernetesProvider, cancel)
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}
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case kubernetes.EventBookmark:
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break
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case kubernetes.EventError:
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break
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}
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case err, ok := <-errorChan:
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if !ok {
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errorChan = nil
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continue
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}
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log.Printf("[ERROR] Agent creation, watching %v namespace, error: %v", config.Config.KubesharkResourcesNamespace, err)
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cancel()
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case <-timeAfter:
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if !isPodReady {
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log.Printf(utils.Error, "Kubeshark Hub was not ready in time")
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cancel()
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}
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case <-ctx.Done():
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log.Printf("Watching Hub pod loop, ctx done")
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return
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}
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}
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}
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func watchFrontPod(ctx context.Context, kubernetesProvider *kubernetes.Provider, cancel context.CancelFunc) {
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podExactRegex := regexp.MustCompile(fmt.Sprintf("^%s$", kubernetes.FrontPodName))
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podWatchHelper := kubernetes.NewPodWatchHelper(kubernetesProvider, podExactRegex)
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eventChan, errorChan := kubernetes.FilteredWatch(ctx, podWatchHelper, []string{config.Config.KubesharkResourcesNamespace}, podWatchHelper)
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isPodReady := false
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hubTimeoutSec := config.GetIntEnvConfig(config.HubTimeoutSec, 120)
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timeAfter := time.After(time.Duration(hubTimeoutSec) * time.Second)
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for {
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select {
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case wEvent, ok := <-eventChan:
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if !ok {
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eventChan = nil
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continue
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}
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switch wEvent.Type {
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case kubernetes.EventAdded:
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log.Printf("Watching Hub pod loop, added")
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case kubernetes.EventDeleted:
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log.Printf("%s removed", kubernetes.FrontPodName)
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cancel()
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return
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case kubernetes.EventModified:
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modifiedPod, err := wEvent.ToPod()
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if err != nil {
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log.Printf(utils.Error, err)
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cancel()
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continue
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}
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log.Printf("Watching Hub pod loop, modified: %v, containers statuses: %v", modifiedPod.Status.Phase, modifiedPod.Status.ContainerStatuses)
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if modifiedPod.Status.Phase == core.PodRunning && !isPodReady {
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isPodReady = true
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frontPodReady = true
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}
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if !proxyDone && hubPodReady && frontPodReady {
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proxyDone = true
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postFrontStarted(ctx, kubernetesProvider, cancel)
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}
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case kubernetes.EventBookmark:
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break
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case kubernetes.EventError:
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break
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}
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case err, ok := <-errorChan:
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if !ok {
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errorChan = nil
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continue
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}
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log.Printf("[ERROR] Agent creation, watching %v namespace, error: %v", config.Config.KubesharkResourcesNamespace, err)
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cancel()
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case <-timeAfter:
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if !isPodReady {
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log.Printf(utils.Error, "Kubeshark Hub was not ready in time")
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cancel()
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}
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case <-ctx.Done():
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log.Printf("Watching Hub pod loop, ctx done")
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return
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}
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}
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}
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func watchHubEvents(ctx context.Context, kubernetesProvider *kubernetes.Provider, cancel context.CancelFunc) {
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podExactRegex := regexp.MustCompile(fmt.Sprintf("^%s", kubernetes.HubPodName))
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eventWatchHelper := kubernetes.NewEventWatchHelper(kubernetesProvider, podExactRegex, "pod")
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eventChan, errorChan := kubernetes.FilteredWatch(ctx, eventWatchHelper, []string{config.Config.KubesharkResourcesNamespace}, eventWatchHelper)
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for {
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select {
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case wEvent, ok := <-eventChan:
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if !ok {
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eventChan = nil
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continue
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}
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event, err := wEvent.ToEvent()
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if err != nil {
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log.Printf("[ERROR] parsing Kubeshark resource event: %+v", err)
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continue
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}
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if state.startTime.After(event.CreationTimestamp.Time) {
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continue
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}
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log.Printf(
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"Watching Hub events loop, event %s, time: %v, resource: %s (%s), reason: %s, note: %s",
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event.Name,
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event.CreationTimestamp.Time,
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event.Regarding.Name,
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event.Regarding.Kind,
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event.Reason,
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event.Note,
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)
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switch event.Reason {
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case "FailedScheduling", "Failed":
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log.Printf(utils.Error, fmt.Sprintf("Kubeshark Hub status: %s - %s", event.Reason, event.Note))
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cancel()
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}
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case err, ok := <-errorChan:
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if !ok {
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errorChan = nil
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continue
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}
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log.Printf("[Error] Watching Hub events loop, error: %+v", err)
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case <-ctx.Done():
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log.Printf("Watching Hub events loop, ctx done")
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return
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}
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}
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}
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func postHubStarted(ctx context.Context, kubernetesProvider *kubernetes.Provider, cancel context.CancelFunc) {
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startProxyReportErrorIfAny(kubernetesProvider, ctx, cancel, kubernetes.HubServiceName, config.Config.Hub.PortForward.SrcPort, config.Config.Hub.PortForward.DstPort, "/echo")
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if err := startTapperSyncer(ctx, cancel, kubernetesProvider, state.targetNamespaces, state.startTime); err != nil {
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log.Printf(utils.Error, fmt.Sprintf("Error starting kubeshark tapper syncer: %v", errormessage.FormatError(err)))
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cancel()
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}
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url := kubernetes.GetLocalhostOnPort(config.Config.Hub.PortForward.SrcPort)
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log.Printf("Hub is available at %s", url)
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}
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func postFrontStarted(ctx context.Context, kubernetesProvider *kubernetes.Provider, cancel context.CancelFunc) {
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startProxyReportErrorIfAny(kubernetesProvider, ctx, cancel, kubernetes.FrontServiceName, config.Config.Front.PortForward.SrcPort, config.Config.Front.PortForward.DstPort, "")
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url := kubernetes.GetLocalhostOnPort(config.Config.Front.PortForward.SrcPort)
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log.Printf("Kubeshark is available at %s", url)
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if !config.Config.HeadlessMode {
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utils.OpenBrowser(url)
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}
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}
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func getNamespaces(kubernetesProvider *kubernetes.Provider) []string {
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if config.Config.Tap.AllNamespaces {
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return []string{kubernetes.K8sAllNamespaces}
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} else if len(config.Config.Tap.Namespaces) > 0 {
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return utils.Unique(config.Config.Tap.Namespaces)
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} else {
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currentNamespace, err := kubernetesProvider.CurrentNamespace()
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if err != nil {
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log.Fatalf(utils.Red, fmt.Sprintf("error getting current namespace: %+v", err))
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}
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return []string{currentNamespace}
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}
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}
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