pkg net, method (*DNSError) Unwrap() error #63116
pkg net, method (*TCPConn) SetKeepAliveConfig(KeepAliveConfig) error #62254
pkg net, type DNSError struct, UnwrapErr error #63116
pkg net, type Dialer struct, KeepAliveConfig KeepAliveConfig #62254
pkg net, type KeepAliveConfig struct #62254
pkg net, type KeepAliveConfig struct, Count int #62254
pkg net, type KeepAliveConfig struct, Enable bool #62254

func SupportsRawSocket() bool {
	stackOnce.Do(probeStack)
	return rawSocketSess
}

// TestableNetwork reports whether network is testable on the current
// platform configuration.
//
// See func Dial of the standard library for the supported networks.
func TestableNetwork(network string) bool {
	ss := strings.Split(network, ":")
	switch ss[0] {
	case "ip+nopriv":
		// This is an internal network name for testing on the

	for _, ans := range rx.FindAllStringSubmatch(r, -1) {
		ptr = append(ptr, absDomainName(ans[1]))
	}
	return
}

func localIP() (ip IP, err error) {
	conn, err := Dial("udp", "golang.org:80")
	if err != nil {
		return nil, err
	}
	defer conn.Close()

	localAddr := conn.LocalAddr().(*UDPAddr)

	return localAddr.IP, nil