Initial: added code for CLI-tool

Signed-off-by: Dagfinrud, Daniel Risnes <daniel.dagfinrud@altibox.no>

cmd/root.go

@@ -0,0 +1,29 @@
+package cmd
+
+import (
+ "fmt"
+ "os"
+
+ "github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+ Use: "netfetch",
+ Short: "Netfetch is a CLI tool for scanning Kubernetes network traffic",
+ Long: `Netfetch scans Kubernetes namespaces to identify network traffic 
+ between pods.`,
+ // Uncomment the following line if your bare application
+ // has an action associated with it:
+ // Run: func(cmd *cobra.Command, args []string) { },
+}
+
+func Execute() {
+ if err := rootCmd.Execute(); err != nil {
+ fmt.Fprintln(os.Stderr, err)
+ os.Exit(1)
+ }
+}
+
+func init() {
+ // Here you will define your flags and configuration settings.
+}

cmd/scan.go

@@ -0,0 +1,28 @@
+package cmd
+
+import (
+ "fmt"
+ "netfetch/k8s"
+
+ "github.com/spf13/cobra"
+)
+
+var namespace string
+
+var scanCmd = &cobra.Command{
+ Use: "scan",
+ Short: "Scan a Kubernetes namespace",
+ Long: `Scan a specified Kubernetes namespace for pod-to-pod network traffic.`,
+ Run: func(cmd *cobra.Command, args []string) {
+ if namespace == "" {
+ fmt.Println("Please specify a namespace")
+ return
+ }
+ k8s.ScanNamespace(namespace)
+ },
+}
+
+func init() {
+ rootCmd.AddCommand(scanCmd)
+ scanCmd.Flags().StringVarP(&namespace, "namespace", "n", "", "Specify the namespace to scan")
+}

go.mod

@@ -0,0 +1,51 @@
+module github.com/deggja/netfetch
+
+go 1.21
+
+require (
+ github.com/spf13/cobra v1.8.0
+ k8s.io/apimachinery v0.28.4
+ k8s.io/client-go v0.28.4
+)
+
+require (
+ github.com/davecgh/go-spew v1.1.1 // indirect
+ github.com/emicklei/go-restful/v3 v3.9.0 // indirect
+ github.com/go-logr/logr v1.2.4 // indirect
+ github.com/go-openapi/jsonpointer v0.19.6 // indirect
+ github.com/go-openapi/jsonreference v0.20.2 // indirect
+ github.com/go-openapi/swag v0.22.3 // indirect
+ github.com/gogo/protobuf v1.3.2 // indirect
+ github.com/golang/protobuf v1.5.3 // indirect
+ github.com/google/gnostic-models v0.6.8 // indirect
+ github.com/google/go-cmp v0.5.9 // indirect
+ github.com/google/gofuzz v1.2.0 // indirect
+ github.com/google/uuid v1.3.0 // indirect
+ github.com/imdario/mergo v0.3.6 // indirect
+ github.com/inconshreveable/mousetrap v1.1.0 // indirect
+ github.com/josharian/intern v1.0.0 // indirect
+ github.com/json-iterator/go v1.1.12 // indirect
+ github.com/mailru/easyjson v0.7.7 // indirect
+ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+ github.com/modern-go/reflect2 v1.0.2 // indirect
+ github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+ github.com/spf13/pflag v1.0.5 // indirect
+ golang.org/x/net v0.17.0 // indirect
+ golang.org/x/oauth2 v0.8.0 // indirect
+ golang.org/x/sys v0.13.0 // indirect
+ golang.org/x/term v0.13.0 // indirect
+ golang.org/x/text v0.13.0 // indirect
+ golang.org/x/time v0.3.0 // indirect
+ google.golang.org/appengine v1.6.7 // indirect
+ google.golang.org/protobuf v1.31.0 // indirect
+ gopkg.in/inf.v0 v0.9.1 // indirect
+ gopkg.in/yaml.v2 v2.4.0 // indirect
+ gopkg.in/yaml.v3 v3.0.1 // indirect
+ k8s.io/api v0.28.4 // indirect
+ k8s.io/klog/v2 v2.100.1 // indirect
+ k8s.io/kube-openapi v0.0.0-20230717233707-2695361300d9 // indirect
+ k8s.io/utils v0.0.0-20230406110748-d93618cff8a2 // indirect
+ sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+ sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
+ sigs.k8s.io/yaml v1.3.0 // indirect
+)

go.sum

@@ -0,0 +1,154 @@
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k8s/scanner.go

@@ -0,0 +1,37 @@
+package k8s
+
+import (
+ "context"
+ "fmt"
+ "path/filepath"
+
+ metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+ "k8s.io/client-go/kubernetes"
+ "k8s.io/client-go/tools/clientcmd"
+ "k8s.io/client-go/util/homedir"
+)
+
+func ScanNamespace(namespace string) {
+ kubeconfig := filepath.Join(homedir.HomeDir(), ".kube", "config")
+ config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
+ if err != nil {
+ fmt.Printf("Error building kubeconfig: %s\n", err)
+ return
+ }
+
+ clientset, err := kubernetes.NewForConfig(config)
+ if err != nil {
+ fmt.Printf("Error creating Kubernetes client: %s\n", err)
+ return
+ }
+
+ pods, err := clientset.CoreV1().Pods(namespace).List(context.TODO(), metav1.ListOptions{})
+ if err != nil {
+ fmt.Printf("Error listing pods: %s\n", err)
+ return
+ }
+
+ for _, pod := range pods.Items {
+ fmt.Printf("Name: %s, Namespace: %s\n", pod.Name, pod.Namespace)
+ }
+}

main.go

@@ -0,0 +1,9 @@
+package main
+
+import (
+ "netfetch/cmd"
+)
+
+func main() {
+ cmd.Execute()
+}