{Type: v1.NodeInternalIP, Address: "3.3.3.3"},
			},
			wantDNSNames: []string{"hostname-1", "hostname-2", "hostname-3"},
			wantIPs:      []net.IP{netutils.ParseIPSloppy("1.1.1.1"), netutils.ParseIPSloppy("2.2.2.2"), netutils.ParseIPSloppy("3.3.3.3")},
		},
		{
			name: "handle IP and DNS hostnames",
			addresses: []v1.NodeAddress{
				{Type: v1.NodeHostName, Address: "hostname"},

		_, serviceCIDR, err = netutils.ParseCIDRSloppy(nodeIPAMConfig.ServiceCIDR)
		if err != nil {
			klog.ErrorS(err, "Unsuccessful parsing of service CIDR", "CIDR", nodeIPAMConfig.ServiceCIDR)
		}
	}

	if len(strings.TrimSpace(nodeIPAMConfig.SecondaryServiceCIDR)) != 0 {
		_, secondaryServiceCIDR, err = netutils.ParseCIDRSloppy(nodeIPAMConfig.SecondaryServiceCIDR)
		if err != nil {

			// IPs" etc because we won't have gotten this far with an invalid
			// config like that.
			name:              "Dual-stack cloud, with dual-stack nodeIPs",
			nodeIP:            netutils.ParseIPSloppy("2600:1f14:1d4:d101::ba3d"),
			secondaryNodeIP:   netutils.ParseIPSloppy("10.1.1.2"),
			cloudProviderType: cloudProviderExternal,
			nodeAddresses: []v1.NodeAddress{
				{Type: v1.NodeInternalIP, Address: "10.1.1.1"},

*/

package util

import (
	"net"

	"k8s.io/klog/v2"
	netutils "k8s.io/utils/net"
)

// IPPart returns just the IP part of an IP or IP:port or endpoint string. If the IP
// part is an IPv6 address enclosed in brackets (e.g. "[fd00:1::5]:9999"),
// then the brackets are stripped as well.
func IPPart(s string) string {
	if ip := netutils.ParseIPSloppy(s); ip != nil {
		// IP address without port
		return s
	}

	address, _ := netip.AddrFromSlice(bytes)
	return address
}

// Convert netutils.IPFamily to v1.IPFamily
// TODO: consolidate helpers
// copied from pkg/proxy/util/utils.go
func convertToV1IPFamily(ipFamily netutils.IPFamily) v1.IPFamily {
	switch ipFamily {
	case netutils.IPv4:
		return v1.IPv4Protocol
	case netutils.IPv6:
		return v1.IPv6Protocol
	}

	return v1.IPFamilyUnknown

		serviceIPRange, _, err := controlplaneapiserver.ServiceIPRange(extra.PrimaryServiceClusterIPRange)
		if err != nil {
			return []error{fmt.Errorf("error determining service IP ranges: %w", err)}
		}
		if netutils.IsIPv4CIDR(&serviceIPRange) != netutils.IsIPv4(generic.AdvertiseAddress) {
			return []error{fmt.Errorf("service IP family %q must match public address family %q", extra.PrimaryServiceClusterIPRange.String(), generic.AdvertiseAddress.String())}
		}

						Port:     80,
						Protocol: "TCP",
					}: {
						Address:   netutils.ParseIPSloppy("10.20.30.41"),
						Protocol:  "TCP",
						Port:      uint16(80),
						Scheduler: "rr",
					},
					{
						IP:       "100.101.102.103",
						Port:     3001,
						Protocol: "TCP",
					}: {
						Address:   netutils.ParseIPSloppy("100.101.102.103"),
						Protocol:  "TCP",
						Port:      uint16(3001),

		if (family == v1.IPv4Protocol) == netutils.IsIPv4CIDRString(str) {
			npa.cidrStrings = append(npa.cidrStrings, str)
		}
	}
	if len(npa.cidrStrings) == 0 {
		if family == v1.IPv4Protocol {
			npa.cidrStrings = []string{IPv4ZeroCIDR}
		} else {
			npa.cidrStrings = []string{IPv6ZeroCIDR}
		}
	}

	// Now parse
	for _, str := range npa.cidrStrings {
		_, cidr, _ := netutils.ParseCIDRSloppy(str)

	"k8s.io/kubernetes/pkg/controlplane/apiserver/options"
	generatedopenapi "k8s.io/kubernetes/pkg/generated/openapi"
	netutils "k8s.io/utils/net"
)

func TestBuildGenericConfig(t *testing.T) {
	opts := options.NewOptions()
	s := (&apiserveroptions.SecureServingOptions{
		BindAddress: netutils.ParseIPSloppy("127.0.0.1"),
	}).WithLoopback()
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {

			rawNodeIPs: []net.IP{
				netutils.ParseIPSloppy("90.90.90.90"),
				netutils.ParseIPSloppy("2001:db8::2"),
			},
			bindAddress:    "::",
			expectedFamily: v1.IPv4Protocol,
			expectedIPv4:   "90.90.90.90",
			expectedIPv6:   "2001:db8::2",
		},
		{
			name: "Dual stack, primary IPv6",
			rawNodeIPs: []net.IP{
				netutils.ParseIPSloppy("2001:db8::2"),