[client] Add block lan access flag for routers (#3171)

client/cmd/root.go

@@ -38,6 +38,7 @@ const (
 	extraIFaceBlackListFlag = "extra-iface-blacklist"
 	dnsRouteIntervalFlag    = "dns-router-interval"
 	systemInfoFlag          = "system-info"
+	blockLANAccessFlag      = "block-lan-access"
 )
 
 var (
@@ -73,6 +74,7 @@ var (
 	anonymizeFlag           bool
 	debugSystemInfoFlag     bool
 	dnsRouteInterval        time.Duration
+	blockLANAccess          bool
 
 	rootCmd = &cobra.Command{
 		Use:          "netbird",

client/cmd/up.go

@@ -48,6 +48,7 @@ func init() {
 	)
 	upCmd.PersistentFlags().StringSliceVar(&extraIFaceBlackList, extraIFaceBlackListFlag, nil, "Extra list of default interfaces to ignore for listening")
 	upCmd.PersistentFlags().DurationVar(&dnsRouteInterval, dnsRouteIntervalFlag, time.Minute, "DNS route update interval")
+	upCmd.PersistentFlags().BoolVar(&blockLANAccess, blockLANAccessFlag, false, "Block access to local networks (LAN) when using this peer as a router or exit node")
 }
 
 func upFunc(cmd *cobra.Command, args []string) error {
@@ -160,6 +161,10 @@ func runInForegroundMode(ctx context.Context, cmd *cobra.Command) error {
 		ic.DisableFirewall = &disableFirewall
 	}
 
+	if cmd.Flag(blockLANAccessFlag).Changed {
+		ic.BlockLANAccess = &blockLANAccess
+	}
+
 	providedSetupKey, err := getSetupKey()
 	if err != nil {
 		return err
@@ -290,6 +295,10 @@ func runInDaemonMode(ctx context.Context, cmd *cobra.Command) error {
 		loginRequest.DisableFirewall = &disableFirewall
 	}
 
+	if cmd.Flag(blockLANAccessFlag).Changed {
+		loginRequest.BlockLanAccess = &blockLANAccess
+	}
+
 	var loginErr error
 
 	var loginResp *proto.LoginResponse