No private ipv4 address found

1

No private IPv4 address found

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func advertiseAddrFunc(opts LoadOpts, advertiseAddr *net.IPAddr) (string, func() ([]*net.IPAddr, error)) {
	switch {
	case ipaddr.IsAnyV4(advertiseAddr):
		fn := opts.getPrivateIPv4
		if fn == nil {
			fn = ipaddr.GetPrivateIPv4
		}
		return "private IPv4", fn

	case ipaddr.IsAnyV6(advertiseAddr):
		fn := opts.getPublicIPv6
		if fn == nil {
			fn = ipaddr.GetPublicIPv6
		}
		return "public IPv6", fn

	default:
		panic("unsupported net.IPAddr Type")
	}
}

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// GetPrivateIPv4 returns the list of private network IPv4 addresses on
// all active interfaces.
func GetPrivateIPv4() ([]*net.IPAddr, error) {
	addresses, err := activeInterfaceAddresses()
	if err != nil {
		return nil, fmt.Errorf("Failed to get interface addresses: %v", err)
	}

	var addrs []*net.IPAddr
	for _, rawAddr := range addresses {
		var ip net.IP
		switch addr := rawAddr.(type) {
		case *net.IPAddr:
			ip = addr.IP
		case *net.IPNet:
			ip = addr.IP
		default:
			continue
		}
		if ip.To4() == nil {
			continue
		}
		if !isPrivate(ip) {
			continue
		}
		addrs = append(addrs, &net.IPAddr{IP: ip})
	}
	return addrs, nil
}

// Returns addresses from interfaces that is up
func activeInterfaceAddresses() ([]net.Addr, error) {
	var upAddrs []net.Addr
	var loAddrs []net.Addr

	interfaces, err := net.Interfaces()
	if err != nil {
		return nil, fmt.Errorf("Failed to get interfaces: %v", err)
	}

	for _, iface := range interfaces {
		// Require interface to be up
		if iface.Flags&net.FlagUp == 0 {
			continue
		}

		addresses, err := iface.Addrs()
		if err != nil {
			return nil, fmt.Errorf("Failed to get interface addresses: %v", err)
		}

		if iface.Flags&net.FlagLoopback != 0 {
			loAddrs = append(loAddrs, addresses...)
			continue
		}

		upAddrs = append(upAddrs, addresses...)
	}

	if len(upAddrs) == 0 {
		return loAddrs, nil
	}

	return upAddrs, nil
}

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// Interfaces returns a list of the system's network interfaces.
func Interfaces() ([]Interface, error) {
	ift, err := interfaceTable(0)
	if err != nil {
		return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
	}
	if len(ift) != 0 {
		zoneCache.update(ift, false)
	}
	return ift, nil
}

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// If the ifindex is zero, interfaceTable returns mappings of all
// network interfaces. Otherwise it returns a mapping of a specific
// interface.
func interfaceTable(ifindex int) ([]Interface, error) {
	tab, err := syscall.NetlinkRIB(syscall.RTM_GETLINK, syscall.AF_UNSPEC)
	if err != nil {
		return nil, os.NewSyscallError("netlinkrib", err)
	}
	msgs, err := syscall.ParseNetlinkMessage(tab)
	if err != nil {
		return nil, os.NewSyscallError("parsenetlinkmessage", err)
	}
	var ift []Interface
loop:
	for _, m := range msgs {
		switch m.Header.Type {
		case syscall.NLMSG_DONE:
			break loop
		case syscall.RTM_NEWLINK:
			ifim := (*syscall.IfInfomsg)(unsafe.Pointer(&m.Data[0]))
			if ifindex == 0 || ifindex == int(ifim.Index) {
				attrs, err := syscall.ParseNetlinkRouteAttr(&m)
				if err != nil {
					return nil, os.NewSyscallError("parsenetlinkrouteattr", err)
				}
				ift = append(ift, *newLink(ifim, attrs))
				if ifindex == int(ifim.Index) {
					break loop
				}
			}
		}
	}
	return ift, nil
}

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// GetPrivateIPv4 returns the list of private network IPv4 addresses on
// all active interfaces.
func GetPrivateIPv4() ([]*net.IPAddr, error) {
	addresses, err := activeInterfaceAddresses()
	if err != nil {
		return nil, fmt.Errorf("Failed to get interface addresses: %v", err)
	}

	var addrs []*net.IPAddr
	for _, rawAddr := range addresses {
		var ip net.IP
		switch addr := rawAddr.(type) {
		case *net.IPAddr:
			ip = addr.IP
		case *net.IPNet:
			ip = addr.IP
		default:
			continue
		}
		if ip.To4() == nil {
			continue
		}
		if !isPrivate(ip) { //判断是否是
			continue
		}
		addrs = append(addrs, &net.IPAddr{IP: ip})
	}
	return addrs, nil
}

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func isPrivate(ip net.IP) bool {
	for _, priv := range privateBlocks {
		if priv.Contains(ip) {
			return true
		}
	}
	return false
}

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var privateBlocks = []*net.IPNet{
	parseCIDR("10.0.0.0/8"),     // RFC 1918 IPv4 private network address
	parseCIDR("100.64.0.0/10"),  // RFC 6598 IPv4 shared address space
	parseCIDR("127.0.0.0/8"),    // RFC 1122 IPv4 loopback address
	parseCIDR("169.254.0.0/16"), // RFC 3927 IPv4 link local address
	parseCIDR("172.16.0.0/12"),  // RFC 1918 IPv4 private network address
	parseCIDR("192.0.0.0/24"),   // RFC 6890 IPv4 IANA address
	parseCIDR("192.0.2.0/24"),   // RFC 5737 IPv4 documentation address
	parseCIDR("192.168.0.0/16"), // RFC 1918 IPv4 private network address
	parseCIDR("::1/128"),        // RFC 1884 IPv6 loopback address
	parseCIDR("fe80::/10"),      // RFC 4291 IPv6 link local addresses
	parseCIDR("fc00::/7"),       // RFC 4193 IPv6 unique local addresses
	parseCIDR("fec0::/10"),      // RFC 1884 IPv6 site-local addresses
	parseCIDR("2001:db8::/32"),  // RFC 3849 IPv6 documentation address
}