}

// CheckIPFamilyTypeForFirstIPs checks the ip family type for the first ip addresses
func CheckIPFamilyTypeForFirstIPs(ipAddrs []string) (IPFamilyType, error) {
	if len(ipAddrs) == 0 {
		return UNKNOWN, errors.New("the ipAddr slice is empty")
	}

	netIP, err := netip.ParseAddr(ipAddrs[0])
	if err != nil {
		return UNKNOWN, err
	}
	if netIP.Is6() && !netIP.IsLinkLocalUnicast() {
		return IPv6, nil
	}

	"net"
	"net/netip"
	"testing"
)

var tesrLocalIPAddrs = func(ips []netip.Addr) ([]net.Addr, error) {
	var IPAddrs []net.Addr
	for i := 0; i < len(ips); i++ {
		var ipAddr net.Addr
		ipNetAddr := &net.IPNet{IP: net.ParseIP(ips[i].String())}
		ipAddr = ipNetAddr
		IPAddrs = append(IPAddrs, ipAddr)
	}
	return IPAddrs, nil
}

func TestGetLocalIP(t *testing.T) {
	tests := []struct {
		name     string

				isIPv6 = unwrapAddr.Is6()
				ipAddrs = append(ipAddrs, unwrapAddr)
				if !dualStack {
					return unwrapAddr, isIPv6, nil
				}
				if isIPv6 {
					break
				}
			}
		}
	}

	if len(ipAddrs) > 0 {
		return ipAddrs[0], isIPv6, nil
	}

	return netip.Addr{}, isIPv6, fmt.Errorf("no valid local IP address found")

	// to be explicit
	v4, v6 := false, false
	// Obtain all the IPs from the node
	ipAddrs, ok := network.GetPrivateIPs(context.Background())
	if !ok {
		return []string{ip}
	}
	for _, ip := range ipAddrs {
		addr, err := netip.ParseAddr(ip)
		if err != nil {
			// Should not happen
			continue
		}
		if addr.Is4() {
			v4 = true
		} else {

			var ip net.IP
			switch v := addr.(type) {
			case *net.IPNet:
				ip = v.IP
			case *net.IPAddr:
				ip = v.IP
			default:
				continue
			}

			// handling ipv4 wrapping in ipv6
			ipAddr, okay := netip.AddrFromSlice(ip)
			if !okay {
				continue
			}
			unwrapAddr := ipAddr.Unmap()

	return strings.HasSuffix(strings.ToLower(s), strings.ToLower(suffix))
}

func lookupLocalhost(ctx context.Context, fn func(context.Context, string, string) ([]IPAddr, error), network, host string) ([]IPAddr, error) {
	switch host {
	case "localhost":
		return []IPAddr{
			{IP: IPv4(127, 0, 0, 1)},
			{IP: IPv6loopback},
		}, nil
	default:
		return fn(ctx, network, host)
	}
}

)

func (c *IPConn) readFrom(b []byte) (int, *IPAddr, error) {
	return 0, nil, syscall.EPLAN9
}

func (c *IPConn) readMsg(b, oob []byte) (n, oobn, flags int, addr *IPAddr, err error) {
	return 0, 0, 0, nil, syscall.EPLAN9
}

func (c *IPConn) writeTo(b []byte, addr *IPAddr) (int, error) {
	return 0, syscall.EPLAN9
}

func (c *IPConn) writeMsg(b, oob []byte, addr *IPAddr) (n, oobn int, err error) {
	return 0, 0, syscall.EPLAN9

	}
	return syscall.AF_INET6
}

func (a *IPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
	if a == nil {
		return nil, nil
	}
	return ipToSockaddr(family, a.IP, 0, a.Zone)
}

func (a *IPAddr) toLocal(net string) sockaddr {
	return &IPAddr{loopbackIP(net), a.Zone}
}

func (c *IPConn) readFrom(b []byte) (int, *IPAddr, error) {
	// TODO(cw,rsc): consider using readv if we know the family

import (
	"reflect"
	"testing"
)

var testInetaddr = func(ip IPAddr) Addr { return &TCPAddr{IP: ip.IP, Port: 5682, Zone: ip.Zone} }

var addrListTests = []struct {
	filter    func(IPAddr) bool
	ips       []IPAddr
	inetaddr  func(IPAddr) Addr
	first     Addr
	primaries addrList
	fallbacks addrList
	err       error
}{
	{
		nil,
		[]IPAddr{
			{IP: IPv4(127, 0, 0, 1)},
			{IP: IPv6loopback},
		},

	litAddrOrName string
	addr          *IPAddr
	err           error
}

var resolveIPAddrTests = []resolveIPAddrTest{
	{"ip", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},
	{"ip4", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},
	{"ip4:icmp", "127.0.0.1", &IPAddr{IP: IPv4(127, 0, 0, 1)}, nil},

	{"ip", "::1", &IPAddr{IP: ParseIP("::1")}, nil},
	{"ip6", "::1", &IPAddr{IP: ParseIP("::1")}, nil},