// sends fake discovery announcements once every second
func send(bc beacon.Interface) {
ann := discover.Announce{
Magic: discover.AnnouncementMagic,
This: discover.Device{
ID: myID,
Addresses: []discover.Address{
{URL: "tcp://fake.example.com:12345"},
},
},
}
bs, _ := ann.MarshalXDR()
for {
bc.Send(bs)
time.Sleep(time.Second)
}
}
func (s *querysrv) handleQuery(conn *net.UDPConn, addr *net.UDPAddr, buf []byte) error {
var pkt discover.Query
err := pkt.UnmarshalXDR(buf)
if err != nil {
return err
}
var id protocol.DeviceID
copy(id[:], pkt.DeviceID)
addrs, err := s.getAddresses(id)
if err != nil {
return err
}
relays, err := s.getRelays(id)
if err != nil {
return err
}
if len(addrs) > 0 {
ann := discover.Announce{
Magic: discover.AnnouncementMagic,
This: discover.Device{
ID: pkt.DeviceID,
Addresses: addrs,
Relays: relays,
},
}
tb, err := ann.MarshalXDR()
if err != nil {
return fmt.Errorf("QueryV2 response marshal: %v", err)
}
_, err = conn.WriteToUDP(tb, addr)
if err != nil {
return fmt.Errorf("QueryV2 response write: %v", err)
}
globalStats.Answer()
}
return nil
}
func handleQueryV2(db *leveldb.DB, conn *net.UDPConn, addr *net.UDPAddr, buf []byte) error {
var pkt discover.Query
err := pkt.UnmarshalXDR(buf)
if err != nil {
return err
}
if debug {
log.Printf("<- %v %#v", addr, pkt)
}
var id protocol.DeviceID
if len(pkt.DeviceID) == 32 {
// Raw node ID
copy(id[:], pkt.DeviceID)
} else {
err = id.UnmarshalText(pkt.DeviceID)
if err != nil {
return err
}
}
lock.Lock()
queries++
lock.Unlock()
addrs := get(db, id)
now := time.Now().Unix()
if len(addrs) > 0 {
ann := discover.Announce{
Magic: discover.AnnouncementMagic,
This: discover.Device{
ID: pkt.DeviceID,
},
}
for _, addr := range addrs {
if now-addr.seen > cacheLimitSeconds {
continue
}
ann.This.Addresses = append(ann.This.Addresses, discover.Address{IP: addr.ip, Port: addr.port})
}
if debug {
log.Printf("-> %v %#v", addr, pkt)
}
if len(ann.This.Addresses) == 0 {
return nil
}
tb, err := ann.MarshalXDR()
if err != nil {
log.Println("QueryV2 response marshal:", err)
return nil
}
_, err = conn.WriteToUDP(tb, addr)
if err != nil {
log.Println("QueryV2 response write:", err)
return nil
}
lock.Lock()
answered++
lock.Unlock()
}
return nil
}