func MultiaddrsFromServiceEntry(en *mdns.ServiceEntry) [][]byte {
var addrs []ma.Multiaddr
// Parse IP addresses
addr, err := manet.FromIP(en.AddrV4)
if err == nil {
addrs = append(addrs, addr)
}
addr, err = manet.FromIP(en.AddrV6)
if err == nil {
addrs = append(addrs, addr)
}
var bytes [][]byte
for _, addr := range addrs {
// Append port
prt, err := ma.NewMultiaddr(fmt.Sprintf("/tcp/%d", en.Port))
if err != nil {
continue
}
addr = addr.Encapsulate(prt)
bytes = append(bytes, addr.Bytes())
}
return bytes
}
func (m *mapping) ExternalAddr() (ma.Multiaddr, error) {
if time.Now().Sub(m.cacheTime) < CacheTime {
return m.cached, nil
}
if m.ExternalPort() == 0 { // dont even try right now.
return nil, ErrNoMapping
}
ip, err := m.nat.nat.GetExternalAddress()
if err != nil {
return nil, err
}
ipmaddr, err := manet.FromIP(ip)
if err != nil {
return nil, fmt.Errorf("error parsing ip")
}
// call m.ExternalPort again, as mapping may have changed under our feet. (tocttou)
extport := m.ExternalPort()
if extport == 0 {
return nil, ErrNoMapping
}
tcp, err := ma.NewMultiaddr(fmt.Sprintf("/%s/%d", m.Protocol(), extport))
if err != nil {
return nil, err
}
maddr2 := ipmaddr.Encapsulate(tcp)
m.cached = maddr2
m.cacheTime = time.Now()
return maddr2, nil
}
