FIREWALL_DEBUG variable, refers to #190, #194

internal/routing/mutate.go

@@ -16,6 +16,9 @@ func (r *routing) AddRouteVia(ctx context.Context, subnet net.IPNet, defaultGate
 	} else if exists {
 		return nil
 	}
+	if r.debug {
+		fmt.Printf("ip route add %s via %s dev %s\n", subnetStr, defaultGateway, defaultInterface)
+	}
 	output, err := r.commander.Run(ctx, "ip", "route", "add", subnetStr, "via", defaultGateway.String(), "dev", defaultInterface)
 	if err != nil {
 		return fmt.Errorf("cannot add route for %s via %s %s %s: %s: %w", subnetStr, defaultGateway, "dev", defaultInterface, output, err)
@@ -32,6 +35,9 @@ func (r *routing) DeleteRouteVia(ctx context.Context, subnet net.IPNet) (err err
 	} else if !exists { // thanks to @npawelek https://github.com/npawelek
 		return nil
 	}
+	if r.debug {
+		fmt.Printf("ip route del %s\n", subnetStr)
+	}
 	output, err := r.commander.Run(ctx, "ip", "route", "del", subnetStr)
 	if err != nil {
 		return fmt.Errorf("cannot delete route for %s: %s: %w", subnetStr, output, err)

internal/routing/routing.go

@@ -15,12 +15,14 @@ type Routing interface {
 	DefaultRoute() (defaultInterface string, defaultGateway net.IP, err error)
 	LocalSubnet() (defaultSubnet net.IPNet, err error)
 	VPNGatewayIP(defaultInterface string) (ip net.IP, err error)
+	SetDebug()
 }
 
 type routing struct {
 	commander   command.Commander
 	logger      logging.Logger
 	fileManager files.FileManager
+	debug       bool
 }
 
 // NewConfigurator creates a new Configurator instance
@@ -31,3 +33,7 @@ func NewRouting(logger logging.Logger, fileManager files.FileManager) Routing {
 		fileManager: fileManager,
 	}
 }
+
+func (c *routing) SetDebug() {
+	c.debug = true
+}