func (d *Discoverer) startLocalIPv6Multicasts(localMCAddr string) {
intfs, err := net.Interfaces()
if err != nil {
if debug {
l.Debugln("discover: interfaces:", err)
}
l.Infoln("Local discovery over IPv6 unavailable")
return
}
v6Intfs := 0
for _, intf := range intfs {
// Interface flags seem to always be 0 on Windows
if runtime.GOOS != "windows" && (intf.Flags&net.FlagUp == 0 || intf.Flags&net.FlagMulticast == 0) {
continue
}
mb, err := beacon.NewMulticast(localMCAddr, intf.Name)
if err != nil {
if debug {
l.Debugln("discover: Start local v6:", err)
}
continue
}
d.beacons = append(d.beacons, mb)
go d.recvAnnouncements(mb)
v6Intfs++
}
if v6Intfs == 0 {
l.Infoln("Local discovery over IPv6 unavailable")
}
}
func (d *Discoverer) StartLocal(localPort int, localMCAddr string) {
if localPort > 0 {
bb, err := beacon.NewBroadcast(localPort)
if err != nil {
if debug {
l.Debugln(err)
}
l.Infoln("Local discovery over IPv4 unavailable")
} else {
d.broadcastBeacon = bb
go d.recvAnnouncements(bb)
}
}
if len(localMCAddr) > 0 {
mb, err := beacon.NewMulticast(localMCAddr)
if err != nil {
if debug {
l.Debugln(err)
}
l.Infoln("Local discovery over IPv6 unavailable")
} else {
d.multicastBeacon = mb
go d.recvAnnouncements(mb)
}
}
if d.broadcastBeacon == nil && d.multicastBeacon == nil {
l.Warnln("Local discovery unavailable")
} else {
d.localBcastTick = time.Tick(d.localBcastIntv)
d.forcedBcastTick = make(chan time.Time)
go d.sendLocalAnnouncements()
}
}