logger.FatalIf(err, "Unable to get IP addresses of this host")

	for _, interf := range ifs {
		addrs, err := interf.Addrs()
		if err != nil {
			continue
		}
		if runtime.GOOS == "windows" && interf.Flags&net.FlagUp == 0 {
			continue
		}

		for _, addr := range addrs {
			var ip net.IP
			switch v := addr.(type) {
			case *net.IPNet:
				ip = v.IP
			case *net.IPAddr:
				ip = v.IP
			}

				}
			}
			if !found {
				return fmt.Errorf("unexpected address for endpoint %d: %v", i, addr)
			}
		}
	}
	return nil
}

func getLbEndpointAddrs(ep *endpointv3.LocalityLbEndpoints) []string {
	addrs := make([]string, 0)
	for _, lbEp := range ep.LbEndpoints {
		addrs = append(addrs, util.GetEndpointHost(lbEp))
	}
	return addrs

		want6 = bytealg.CountString(addr, '[') > 0
	}
	if want6 {
		return addrs.first(isNotIPv4)
	}
	return addrs.first(isIPv4)
}

// first returns the first address which satisfies strategy, or if
// none do, then the first address of any kind.
func (addrs addrList) first(strategy func(Addr) bool) Addr {
	for _, addr := range addrs {
		if strategy(addr) {
			return addr
		}
	}

func IPv4Unspecified() Addr { return AddrFrom4([4]byte{}) }

// AddrFrom4 returns the address of the IPv4 address given by the bytes in addr.
func AddrFrom4(addr [4]byte) Addr {
	return Addr{
		addr: uint128{0, 0xffff00000000 | uint64(addr[0])<<24 | uint64(addr[1])<<16 | uint64(addr[2])<<8 | uint64(addr[3])},
		z:    z4,
	}
}

// AddrFrom16 returns the IPv6 address given by the bytes in addr.

	for {
		var addr0, addr1 uintptr
		tp0, addr0 = tp0.next(addr + size)
		tp1, addr1 = tp1.next(addr + size)
		if addr0 != addr1 {
			failed = true
			break
		}
		if addr0 == 0 {
			break
		}
	}
	if failed {
		tp0 := s.typePointersOfType(typ, addr)
		tp1 := s.typePointersOf(addr, size)
		print("runtime: addr=", hex(addr), " size=", size, "\n")
		print("runtime: type=", toRType(typ).string(), "\n")

	}
	_ = *addr // if nil, fault before taking the lock
	var r uint64
	addrLock(addr).lock()
	r = *addr
	addrLock(addr).unlock()
	return r
}

//go:nosplit
func goStore64(addr *uint64, v uint64) {
	if uintptr(unsafe.Pointer(addr))&7 != 0 {
		*(*int)(nil) = 0 // crash on unaligned uint64
	}
	_ = *addr // if nil, fault before taking the lock
	addrLock(addr).lock()
	*addr = v
	addrLock(addr).unlock()
}

func FlushFileBuffers(handle Handle) (err error) {
	r1, _, e1 := syscall.Syscall(procFlushFileBuffers.Addr(), 1, uintptr(handle), 0, 0)
	if r1 == 0 {
		err = errnoErr(e1)
	}
	return
}

func FlushViewOfFile(addr uintptr, length uintptr) (err error) {
	r1, _, e1 := syscall.Syscall(procFlushViewOfFile.Addr(), 2, uintptr(addr), uintptr(length), 0)
	if r1 == 0 {
		err = errnoErr(e1)
	}
	return
}

			continue
		}
		have := make([]string, 0)
		addrs, err := ifi.Addrs()
		if err != nil {
			t.Fatal(err)
		}
		for _, addr := range addrs {
			switch addr := addr.(type) {
			case *IPNet:
				if addr.IP.To4() != nil {
					have = append(have, addr.String())
				}
				if addr.IP.To16() != nil && addr.IP.To4() == nil {
					// netsh does not output netmask for ipv6, so ignore ipv6 mask

			cidrs: []string{},
			itfAddrsPairs: []InterfaceAddrsPair{
				{
					itf:   net.Interface{Index: 0, MTU: 0, Name: "eth0", HardwareAddr: nil, Flags: 0},
					addrs: []net.Addr{&net.IPNet{IP: netutils.ParseIPSloppy("2001:db8::1"), Mask: net.CIDRMask(64, 128)}},
				},
				{
					itf:   net.Interface{Index: 1, MTU: 0, Name: "lo", HardwareAddr: nil, Flags: 0},

func TCPAddrFromAddrPort(addr netip.AddrPort) *TCPAddr {
	return &TCPAddr{
		IP:   addr.Addr().AsSlice(),
		Zone: addr.Addr().Zone(),
		Port: int(addr.Port()),
	}
}

// TCPConn is an implementation of the [Conn] interface for TCP network
// connections.
type TCPConn struct {
	conn
}

// KeepAliveConfig contains TCP keep-alive options.
//