new: added -eval command

caplets/beef-active.cap

@@ -1,4 +1,7 @@
-set arp.spoof.targets 192.168.1.53
+# targeting the whole subnet by default, to make it selective:
+#
+#   sudo ./bettercap-ng -caplet caplets/beef-active.cap -eval "set arp.spoof.targets 192.168.1.64"
+
 # inject beef hook
 set http.proxy.script caplets/beef-inject.js
 # keep reading arp table for network mapping

core/options.go

@@ -8,6 +8,7 @@ type Options struct {
 	Debug         *bool
 	Silent        *bool
 	NoHistory     *bool
+	Commands      *string
 }
 
 func ParseOptions() (Options, error) {
@@ -17,6 +18,7 @@ func ParseOptions() (Options, error) {
 		Debug:         flag.Bool("debug", false, "Print debug messages."),
 		Silent:        flag.Bool("silent", false, "Suppress all logs which are not errors."),
 		NoHistory:     flag.Bool("no-history", false, "Disable history file."),
+		Commands:      flag.String("eval", "", "Run a command, used to set variables via command line."),
 	}
 
 	flag.Parse()

main.go

@@ -34,6 +34,12 @@ func main() {
 
 	defer sess.Close()
 
+	if *sess.Options.Commands != "" {
+		if err = sess.Run(*sess.Options.Commands); err != nil {
+			log.Fatal(err)
+		}
+	}
+
 	if *sess.Options.Caplet != "" {
 		if err = sess.RunCaplet(*sess.Options.Caplet); err != nil {
 			log.Fatal(err)