feat(cli): Add --backend flag to specify packet capture backend (#206)

cmd/options.go

@@ -58,6 +58,7 @@ type Options struct {
 	dontConvertAddr int
 	verbose         int
 	quiet           bool
+	backend         string
 
 	containerId   string
 	containerName string
@@ -167,6 +168,13 @@ func prepareOptions(opts *Options, rawArgs []string, args []string) {
 			opts.enhancedContext |= types.EnhancedContextPod
 		}
 	}
+
+	switch types.NetHookBackend(opts.backend) {
+	case types.NetHookBackendTc:
+	default:
+		opts.backend = string(types.NetHookBackendTc)
+	}
+
 }
 
 func getPodNameFilter(raw string) (name, ns string) {

cmd/root.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"context"
 	"fmt"
+	"github.com/mozillazg/ptcpdump/internal/types"
 	"os"
 	"os/signal"
 	"strings"
@@ -130,6 +131,9 @@ func init() {
 	rootCmd.Flags().StringSliceVar(&opts.enhancedContexts, "context",
 		[]string{contextProcess, contextParentProc, contextContainer, contextPod},
 		"Specify which context information to include in the output")
+	rootCmd.Flags().StringVar(&opts.backend, "backend", string(types.NetHookBackendTc),
+		"Specify the backend to use for capturing packets. "+
+			fmt.Sprintf("Possible values are %q", types.NetHookBackendTc))
 
 	silenceKlog()
 }

internal/types/backend.go

@@ -0,0 +1,7 @@
+package types
+
+type NetHookBackend string
+
+const (
+	NetHookBackendTc NetHookBackend = "tc"
+)