// Fetch a given number of best (most recenty seen) peers.
// Set unconnected to true to only get those that we are not connected to.
func GetBestPeers(limit uint, unconnected bool) (res manyPeers) {
if proxyPeer != nil {
if !unconnected || !ConnectionActive(proxyPeer) {
return manyPeers{proxyPeer}
}
return manyPeers{}
}
peerdb_mutex.Lock()
tmp := make(manyPeers, 0)
PeerDB.Browse(func(k qdb.KeyType, v []byte) uint32 {
ad := NewPeer(v)
if ad.Banned == 0 && utils.ValidIp4(ad.Ip4[:]) && !common.IsIPBlocked(ad.Ip4[:]) {
if !unconnected || !ConnectionActive(ad) {
tmp = append(tmp, ad)
}
}
return 0
})
peerdb_mutex.Unlock()
// Copy the top rows to the result buffer
if len(tmp) > 0 {
sort.Sort(tmp)
if uint(len(tmp)) < limit {
limit = uint(len(tmp))
}
res = make(manyPeers, limit)
copy(res, tmp[:limit])
}
return
}
// Parese network's "addr" message
func ParseAddr(pl []byte) {
b := bytes.NewBuffer(pl)
cnt, _ := btc.ReadVLen(b)
for i := 0; i < int(cnt); i++ {
var buf [30]byte
n, e := b.Read(buf[:])
if n != len(buf) || e != nil {
common.CountSafe("AddrError")
//println("ParseAddr:", n, e)
break
}
a := NewPeer(buf[:])
if !utils.ValidIp4(a.Ip4[:]) {
common.CountSafe("AddrInvalid")
} else if time.Unix(int64(a.Time), 0).Before(time.Now().Add(time.Minute)) {
if time.Now().Before(time.Unix(int64(a.Time), 0).Add(ExpirePeerAfter)) {
k := qdb.KeyType(a.UniqID())
v := PeerDB.Get(k)
if v != nil {
a.Banned = NewPeer(v[:]).Banned
}
PeerDB.Put(k, a.Bytes())
} else {
common.CountSafe("AddrStale")
}
} else {
common.CountSafe("AddrInFuture")
}
}
}
func main() {
var dir string
if len(os.Args) > 1 {
dir = os.Args[1]
} else {
dir = utils.BitcoinHome() + "gocoin" + string(os.PathSeparator) + "btcnet" + string(os.PathSeparator) + "peers3"
}
db, er := qdb.NewDB(dir, true)
if er != nil {
println(er.Error())
os.Exit(1)
}
println(db.Count(), "peers in databse", dir)
if db.Count() == 0 {
return
}
tmp := make(manyPeers, db.Count())
cnt := 0
db.Browse(func(k qdb.KeyType, v []byte) uint32 {
np := utils.NewPeer(v)
if !utils.ValidIp4(np.Ip4[:]) {
return 0
}
if cnt < len(tmp) {
tmp[cnt] = np
cnt++
}
return 0
})
sort.Sort(tmp[:cnt])
for cnt = 0; cnt < len(tmp) && cnt < 25; cnt++ {
ad := tmp[cnt]
fmt.Printf("%3d) %16s %5d - seen %5d min ago\n", cnt+1,
fmt.Sprintf("%d.%d.%d.%d", ad.Ip4[0], ad.Ip4[1], ad.Ip4[2], ad.Ip4[3]),
ad.Port, (time.Now().Unix()-int64(ad.Time))/60)
}
}
func (c *OneConnection) HandleVersion(pl []byte) error {
if len(pl) >= 80 /*Up to, includiong, the nonce */ {
c.Mutex.Lock()
c.Node.Version = binary.LittleEndian.Uint32(pl[0:4])
if bytes.Equal(pl[72:80], nonce[:]) {
c.Mutex.Unlock()
return errors.New("Connecting to ourselves")
}
if c.Node.Version < MIN_PROTO_VERSION {
c.Mutex.Unlock()
return errors.New("Client version too low")
}
c.Node.Services = binary.LittleEndian.Uint64(pl[4:12])
c.Node.Timestamp = binary.LittleEndian.Uint64(pl[12:20])
c.Mutex.Unlock()
if utils.ValidIp4(pl[40:44]) {
ExternalIpMutex.Lock()
c.Node.ReportedIp4 = binary.BigEndian.Uint32(pl[40:44])
ExternalIp4[c.Node.ReportedIp4] = [2]uint{ExternalIp4[c.Node.ReportedIp4][0] + 1, uint(time.Now().Unix())}
ExternalIpMutex.Unlock()
}
if len(pl) >= 86 {
c.Mutex.Lock()
le, of := btc.VLen(pl[80:])
of += 80
c.Node.Agent = string(pl[of : of+le])
of += le
if len(pl) >= of+4 {
c.Node.Height = binary.LittleEndian.Uint32(pl[of : of+4])
of += 4
if len(pl) > of && pl[of] == 0 {
c.Node.DoNotRelayTxs = true
}
}
c.Mutex.Unlock()
}
} else {
return errors.New("common.Version message too short")
}
c.SendRawMsg("verack", []byte{})
return nil
}