Cleanup route handling (#542)

* mikrotik: allow to set DNS, wip: handle routes in wg-controller

* replace old route handling for local controller

* cleanup route handling for local backend

* implement route handling for mikrotik controller

internal/config/backend.go

@@ -13,6 +13,7 @@ type Backend struct {
 	// Local Backend-specific configuration
 
 	IgnoredLocalInterfaces []string `yaml:"ignored_local_interfaces"` // A list of interface names that should be ignored by this backend (e.g., "wg0")
+	LocalResolvconfPrefix  string   `yaml:"local_resolvconf_prefix"`  // The prefix to use for interface names when passing them to resolvconf.
 
 	// External Backend-specific configuration
 

internal/config/config.go

@@ -134,6 +134,9 @@ func defaultConfig() *Config {
 
 	cfg.Backend = Backend{
 		Default: LocalBackendName, // local backend is the default (using wgcrtl)
+		// Most resolconf implementations use "tun." as a prefix for interface names.
+		// But systemd's implementation uses no prefix, for example.
+		LocalResolvconfPrefix: "tun.",
 	}
 
 	cfg.Web = WebConfig{