72 lines
1.3 KiB
Go
72 lines
1.3 KiB
Go
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package diag
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import (
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"fmt"
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"net"
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)
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type ra6 struct {
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children []Node
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ifname string
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}
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func (d *ra6) String() string {
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return "ra6/" + d.ifname
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}
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func (d *ra6) Then(t Node) Node {
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d.children = append(d.children, t)
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return d
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}
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func (d *ra6) Children() []Node {
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return d.children
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}
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func isEUI64(ip net.IP) bool {
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if ip.To16() == nil {
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return false
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}
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ip = ip.To16()
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return ip[11] == 0xff && ip[12] == 0xfe
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}
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func (d *ra6) Evaluate() (string, error) {
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iface, err := net.InterfaceByName(d.ifname)
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if err != nil {
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return "", err
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}
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addrs, err := iface.Addrs()
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if err != nil {
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return "", err
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}
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var first string
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for _, addr := range addrs {
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ipnet, ok := addr.(*net.IPNet)
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if !ok {
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continue
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}
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if ones, _ := ipnet.Mask.Size(); ones != 64 {
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continue
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}
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if !global.Contains(ipnet.IP) {
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continue // skip local IPv6 addresses
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}
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if !isEUI64(ipnet.IP) {
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continue // skip non-autoconf addresses (e.g. DHCPv6 temporary IP)
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}
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first = ipnet.String()
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}
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if first == "" {
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return "", fmt.Errorf("no SLAAC address found")
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}
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return first, nil
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}
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// RouterAdvertisments returns a Node which succeeds if the specified interface
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// obtained at least one address from IPv6 router advertisments.
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func RouterAdvertisments(ifname string) Node {
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return &ra6{ifname: ifname}
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}
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