Struct CallbackRouter

wgengine/router/callback.go:16–37

CallbackRouter is an implementation of both Router and dns.OSConfigurator. When either network or DNS settings are changed, SetBoth is called with both configs. Mainly used as a shim for OSes that want to set both network and DNS configuration simultaneously (Mac, iOS, Android).

// Mainly used as a shim for OSes that want to set both network and
// DNS configuration simultaneously (Mac, iOS, Android).
type CallbackRouter struct {
	SetBoth  func(rcfg *Config, dcfg *dns.OSConfig) error
	SplitDNS bool

	// GetBaseConfigFunc optionally specifies a function to return the current DNS
	// config in response to GetBaseConfig.
	//
	// If nil, reading the current config isn't supported and GetBaseConfig()
	// will return ErrGetBaseConfigNotSupported.
	GetBaseConfigFunc func() (dns.OSConfig, error)

	// InitialMTU is the MTU the tun should be initialized with.
	// Zero means don't change the MTU from the default. This MTU
	// is applied only once, shortly after the TUN is created, and
	// ignored thereafter.
	InitialMTU uint32

	mu        sync.Mutex    // protects all the following
	didSetMTU bool          // if we set the MTU already
	rcfg      *Config       // last applied router config
	dcfg      *dns.OSConfig // last applied DNS config
}

// Up implements Router.
func (r *CallbackRouter) Up() error {