func ExpirePeers() {
peerdb_mutex.Lock()
var delcnt uint32
now := time.Now()
todel := make([]qdb.KeyType, PeerDB.Count())
PeerDB.Browse(func(k qdb.KeyType, v []byte) uint32 {
ptim := binary.LittleEndian.Uint32(v[0:4])
if now.After(time.Unix(int64(ptim), 0).Add(ExpirePeerAfter)) {
todel[delcnt] = k // we cannot call Del() from here
delcnt++
}
return 0
})
if delcnt > 0 {
common.CountSafeAdd("PeersExpired", uint64(delcnt))
for delcnt > 0 {
delcnt--
PeerDB.Del(todel[delcnt])
}
common.CountSafe("PeerDefragsDone")
PeerDB.Defrag()
} else {
common.CountSafe("PeerDefragsNone")
}
peerdb_mutex.Unlock()
}
func (c *OneConnection) SendRawMsg(cmd string, pl []byte) (e error) {
c.Mutex.Lock()
if c.Send.Buf != nil {
// Before adding more data to the buffer, check the limit
if len(c.Send.Buf) > MaxSendBufferSize {
c.Mutex.Unlock()
if common.DebugLevel > 0 {
println(c.PeerAddr.Ip(), "Peer Send Buffer Overflow")
}
c.Disconnect()
common.CountSafe("PeerSendOverflow")
return errors.New("Send buffer overflow")
}
} else {
c.Send.LastSent = time.Now()
}
common.CountSafe("sent_" + cmd)
common.CountSafeAdd("sbts_"+cmd, uint64(len(pl)))
sbuf := make([]byte, 24+len(pl))
c.LastCmdSent = cmd
c.LastBtsSent = uint32(len(pl))
binary.LittleEndian.PutUint32(sbuf[0:4], common.Version)
copy(sbuf[0:4], common.Magic[:])
copy(sbuf[4:16], cmd)
binary.LittleEndian.PutUint32(sbuf[16:20], uint32(len(pl)))
sh := btc.Sha2Sum(pl[:])
copy(sbuf[20:24], sh[:4])
copy(sbuf[24:], pl)
c.Send.Buf = append(c.Send.Buf, sbuf...)
if common.DebugLevel < 0 {
fmt.Println(cmd, len(c.Send.Buf), "->", c.PeerAddr.Ip())
}
c.Mutex.Unlock()
//println(len(c.Send.Buf), "queued for seding to", c.PeerAddr.Ip())
return
}
func (c *OneConnection) SendRawMsg(cmd string, pl []byte) (e error) {
c.Mutex.Lock()
if !c.broken {
// we never allow the buffer to be totally full because then producer would be equal consumer
if bytes_left := SendBufSize - c.BytesToSent(); bytes_left <= len(pl)+24 {
c.Mutex.Unlock()
/*println(c.PeerAddr.Ip(), c.Node.Version, c.Node.Agent, "Peer Send Buffer Overflow @",
cmd, bytes_left, len(pl)+24, c.SendBufProd, c.SendBufCons, c.BytesToSent())*/
c.Disconnect()
common.CountSafe("PeerSendOverflow")
return errors.New("Send buffer overflow")
}
c.counters["sent_"+cmd]++
c.counters["sbts_"+cmd] += uint64(len(pl))
common.CountSafe("sent_" + cmd)
common.CountSafeAdd("sbts_"+cmd, uint64(len(pl)))
var sbuf [24]byte
c.X.LastCmdSent = cmd
c.X.LastBtsSent = uint32(len(pl))
binary.LittleEndian.PutUint32(sbuf[0:4], common.Version)
copy(sbuf[0:4], common.Magic[:])
copy(sbuf[4:16], cmd)
binary.LittleEndian.PutUint32(sbuf[16:20], uint32(len(pl)))
sh := btc.Sha2Sum(pl[:])
copy(sbuf[20:24], sh[:4])
c.append_to_send_buffer(sbuf[:])
c.append_to_send_buffer(pl)
if x := c.BytesToSent(); x > c.X.MaxSentBufSize {
c.X.MaxSentBufSize = x
}
}
c.Mutex.Unlock()
return
}
// Process that handles communication with a single peer
func (c *OneConnection) Run() {
c.SendVersion()
c.Mutex.Lock()
c.LastDataGot = time.Now()
c.NextBlocksAsk = time.Now() // ask for blocks ASAP
c.NextGetAddr = time.Now() // do getaddr ~10 seconds from now
c.NextPing = time.Now().Add(5 * time.Second) // do first ping ~5 seconds from now
c.Mutex.Unlock()
for !c.IsBroken() {
c.Mutex.Lock()
c.LoopCnt++
c.Mutex.Unlock()
cmd := c.FetchMessage()
if c.IsBroken() {
break
}
// Timeout ping in progress
if c.PingInProgress != nil && time.Now().After(c.LastPingSent.Add(PingTimeout)) {
if common.DebugLevel > 0 {
println(c.PeerAddr.Ip(), "ping timeout")
}
common.CountSafe("PingTimeout")
c.HandlePong() // this will set LastPingSent to nil
}
if cmd == nil {
c.Tick()
continue
}
c.Mutex.Lock()
c.LastDataGot = time.Now()
c.LastCmdRcvd = cmd.cmd
c.LastBtsRcvd = uint32(len(cmd.pl))
c.Mutex.Unlock()
c.PeerAddr.Alive()
if common.DebugLevel < 0 {
fmt.Println(c.PeerAddr.Ip(), "->", cmd.cmd, len(cmd.pl))
}
if c.Send.Buf != nil && len(c.Send.Buf) > SendBufSizeHoldOn {
common.CountSafe("hold_" + cmd.cmd)
common.CountSafeAdd("hbts_"+cmd.cmd, uint64(len(cmd.pl)))
continue
}
common.CountSafe("rcvd_" + cmd.cmd)
common.CountSafeAdd("rbts_"+cmd.cmd, uint64(len(cmd.pl)))
switch cmd.cmd {
case "version":
er := c.HandleVersion(cmd.pl)
if er != nil {
println("version:", er.Error())
c.Disconnect()
}
case "verack":
c.VerackReceived = true
if common.CFG.Net.ListenTCP {
c.SendOwnAddr()
}
case "inv":
c.ProcessInv(cmd.pl)
case "tx":
if common.CFG.TXPool.Enabled {
c.ParseTxNet(cmd.pl)
}
case "addr":
ParseAddr(cmd.pl)
case "block": //block received
netBlockReceived(c, cmd.pl)
case "getblocks":
c.GetBlocks(cmd.pl)
case "getdata":
c.ProcessGetData(cmd.pl)
case "getaddr":
c.SendAddr()
case "alert":
c.HandleAlert(cmd.pl)
case "ping":
re := make([]byte, len(cmd.pl))
copy(re, cmd.pl)
c.SendRawMsg("pong", re)
case "pong":
if c.PingInProgress == nil {
common.CountSafe("PongUnexpected")
} else if bytes.Equal(cmd.pl, c.PingInProgress) {
c.HandlePong()
} else {
common.CountSafe("PongMismatch")
}
case "getheaders":
c.GetHeaders(cmd.pl)
case "notfound":
common.CountSafe("NotFound")
default:
if common.DebugLevel > 0 {
println(cmd.cmd, "from", c.PeerAddr.Ip())
}
}
}
c.Mutex.Lock()
ban := c.banit
c.Mutex.Unlock()
if ban {
c.PeerAddr.Ban()
common.CountSafe("PeersBanned")
} else if c.Incoming {
HammeringMutex.Lock()
RecentlyDisconencted[c.PeerAddr.NetAddr.Ip4] = time.Now()
HammeringMutex.Unlock()
}
if common.DebugLevel > 0 {
println("Disconnected from", c.PeerAddr.Ip())
}
c.NetConn.Close()
}
// Process that handles communication with a single peer
func (c *OneConnection) Run() {
c.SendVersion()
c.Mutex.Lock()
now := time.Now()
c.X.LastDataGot = now
c.nextMaintanence = now.Add(time.Minute)
c.LastPingSent = now.Add(5*time.Second - common.PingPeerEvery) // do first ping ~5 seconds from now
c.Mutex.Unlock()
for !c.IsBroken() {
if c.IsBroken() {
break
}
if c.SendPendingData() {
continue // Do now read the socket if we have pending data to send
}
cmd := c.FetchMessage()
if cmd == nil {
c.Tick()
continue
}
if c.X.VerackReceived {
c.PeerAddr.Alive()
}
c.Mutex.Lock()
c.counters["rcvd_"+cmd.cmd]++
c.counters["rbts_"+cmd.cmd] += uint64(len(cmd.pl))
c.X.LastDataGot = time.Now()
c.X.LastCmdRcvd = cmd.cmd
c.X.LastBtsRcvd = uint32(len(cmd.pl))
c.Mutex.Unlock()
if common.DebugLevel < 0 {
fmt.Println(c.PeerAddr.Ip(), "->", cmd.cmd, len(cmd.pl))
}
common.CountSafe("rcvd_" + cmd.cmd)
common.CountSafeAdd("rbts_"+cmd.cmd, uint64(len(cmd.pl)))
switch cmd.cmd {
case "version":
er := c.HandleVersion(cmd.pl)
if er != nil {
println("version msg error:", er.Error())
c.Disconnect()
break
}
if c.Node.DoNotRelayTxs {
c.DoS("SPV")
break
}
if c.Node.Version >= 70012 {
c.SendRawMsg("sendheaders", nil)
if c.Node.Version >= 70013 {
if common.CFG.TXPool.FeePerByte != 0 {
var pl [8]byte
binary.LittleEndian.PutUint64(pl[:], 1000*common.CFG.TXPool.FeePerByte)
c.SendRawMsg("feefilter", pl[:])
}
if c.Node.Version >= 70014 {
if (c.Node.Services & SERVICE_SEGWIT) == 0 {
// if the node does not support segwit, request compact blocks
// only if we have not achieved he segwit enforcement moment
if common.BlockChain.Consensus.Enforce_SEGWIT == 0 ||
common.Last.BlockHeight() < common.BlockChain.Consensus.Enforce_SEGWIT {
c.SendRawMsg("sendcmpct", []byte{0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
}
} else {
c.SendRawMsg("sendcmpct", []byte{0x01, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00})
}
}
}
}
case "verack":
c.X.VerackReceived = true
c.PeerAddr.Services = c.Node.Services
c.PeerAddr.Save()
if common.IsListenTCP() {
c.SendOwnAddr()
}
case "inv":
c.ProcessInv(cmd.pl)
case "tx":
if common.CFG.TXPool.Enabled {
c.ParseTxNet(cmd.pl)
}
case "addr":
c.ParseAddr(cmd.pl)
case "block": //block received
netBlockReceived(c, cmd.pl)
case "getblocks":
c.GetBlocks(cmd.pl)
case "getdata":
c.ProcessGetData(cmd.pl)
case "getaddr":
if !c.X.GetAddrDone {
c.SendAddr()
c.X.GetAddrDone = true
} else {
c.Mutex.Lock()
c.counters["SecondGetAddr"]++
c.Mutex.Unlock()
if c.Misbehave("SecondGetAddr", 1000/20) {
break
}
}
case "ping":
re := make([]byte, len(cmd.pl))
copy(re, cmd.pl)
c.SendRawMsg("pong", re)
case "pong":
if c.PingInProgress == nil {
common.CountSafe("PongUnexpected")
} else if bytes.Equal(cmd.pl, c.PingInProgress) {
c.HandlePong()
} else {
common.CountSafe("PongMismatch")
}
case "getheaders":
c.GetHeaders(cmd.pl)
case "notfound":
common.CountSafe("NotFound")
case "headers":
if c.HandleHeaders(cmd.pl) > 0 {
c.sendGetHeaders()
}
case "sendheaders":
c.Node.SendHeaders = true
case "feefilter":
if len(cmd.pl) >= 8 {
c.X.MinFeeSPKB = int64(binary.LittleEndian.Uint64(cmd.pl[:8]))
//println(c.PeerAddr.Ip(), c.Node.Agent, "feefilter", c.X.MinFeeSPKB)
}
case "sendcmpct":
if len(cmd.pl) >= 9 {
version := binary.LittleEndian.Uint64(cmd.pl[1:9])
if version > c.Node.SendCmpctVer {
//println(c.ConnID, "sendcmpct", cmd.pl[0])
c.Node.SendCmpctVer = version
c.Node.HighBandwidth = cmd.pl[0] == 1
} else {
c.Mutex.Lock()
c.counters[fmt.Sprint("SendCmpctV", version)]++
c.Mutex.Unlock()
}
} else {
println(c.ConnID, c.PeerAddr.Ip(), c.Node.Agent, "sendcmpct", hex.EncodeToString(cmd.pl))
}
case "cmpctblock":
c.ProcessCmpctBlock(cmd.pl)
case "getblocktxn":
c.ProcessGetBlockTxn(cmd.pl)
//println(c.ConnID, c.PeerAddr.Ip(), c.Node.Agent, "getblocktxn", hex.EncodeToString(cmd.pl))
case "blocktxn":
c.ProcessBlockTxn(cmd.pl)
//println(c.ConnID, c.PeerAddr.Ip(), c.Node.Agent, "blocktxn", hex.EncodeToString(cmd.pl))
default:
if common.DebugLevel > 0 {
println(cmd.cmd, "from", c.PeerAddr.Ip())
}
}
}
c.Mutex.Lock()
MutexRcv.Lock()
for k, _ := range c.GetBlockInProgress {
if rec, ok := BlocksToGet[k]; ok {
rec.InProgress--
} else {
//println("ERROR! Block", bip.hash.String(), "in progress, but not in BlocksToGet")
}
}
MutexRcv.Unlock()
ban := c.banit
c.Mutex.Unlock()
if ban {
c.PeerAddr.Ban()
common.CountSafe("PeersBanned")
} else if c.X.Incomming {
HammeringMutex.Lock()
RecentlyDisconencted[c.PeerAddr.NetAddr.Ip4] = time.Now()
HammeringMutex.Unlock()
}
if common.DebugLevel != 0 {
println("Disconnected from", c.PeerAddr.Ip())
}
c.Conn.Close()
}