12 "github.com/cespare/xxhash"
22 "github.com/anacrolix/chansync"
23 "github.com/anacrolix/chansync/events"
24 "github.com/anacrolix/dht/v2"
25 "github.com/anacrolix/dht/v2/krpc"
26 . "github.com/anacrolix/generics"
27 g "github.com/anacrolix/generics"
28 "github.com/anacrolix/log"
29 "github.com/anacrolix/missinggo/perf"
30 "github.com/anacrolix/missinggo/v2"
31 "github.com/anacrolix/missinggo/v2/bitmap"
32 "github.com/anacrolix/missinggo/v2/pproffd"
33 "github.com/anacrolix/sync"
34 "github.com/davecgh/go-spew/spew"
35 "github.com/dustin/go-humanize"
36 gbtree "github.com/google/btree"
37 "github.com/pion/datachannel"
39 "github.com/anacrolix/torrent/bencode"
40 "github.com/anacrolix/torrent/internal/check"
41 "github.com/anacrolix/torrent/internal/limiter"
42 "github.com/anacrolix/torrent/iplist"
43 "github.com/anacrolix/torrent/metainfo"
44 "github.com/anacrolix/torrent/mse"
45 pp "github.com/anacrolix/torrent/peer_protocol"
46 utHolepunch "github.com/anacrolix/torrent/peer_protocol/ut-holepunch"
47 request_strategy "github.com/anacrolix/torrent/request-strategy"
48 "github.com/anacrolix/torrent/storage"
49 "github.com/anacrolix/torrent/tracker"
50 "github.com/anacrolix/torrent/types/infohash"
51 "github.com/anacrolix/torrent/webtorrent"
54 // Clients contain zero or more Torrents. A Client manages a blocklist, the
55 // TCP/UDP protocol ports, and DHT as desired.
57 // An aggregate of stats over all connections. First in struct to ensure 64-bit alignment of
63 closed chansync.SetOnce
69 defaultStorage *storage.Client
73 dhtServers []DhtServer
74 ipBlockList iplist.Ranger
76 // Set of addresses that have our client ID. This intentionally will
77 // include ourselves if we end up trying to connect to our own address
78 // through legitimate channels.
79 dopplegangerAddrs map[string]struct{}
80 badPeerIPs map[netip.Addr]struct{}
81 torrents map[InfoHash]*Torrent
82 pieceRequestOrder map[interface{}]*request_strategy.PieceRequestOrder
84 acceptLimiter map[ipStr]int
87 websocketTrackers websocketTrackers
89 activeAnnounceLimiter limiter.Instance
90 httpClient *http.Client
92 clientHolepunchAddrSets
97 func (cl *Client) BadPeerIPs() (ips []string) {
99 ips = cl.badPeerIPsLocked()
104 func (cl *Client) badPeerIPsLocked() (ips []string) {
105 ips = make([]string, len(cl.badPeerIPs))
107 for k := range cl.badPeerIPs {
114 func (cl *Client) PeerID() PeerID {
118 // Returns the port number for the first listener that has one. No longer assumes that all port
119 // numbers are the same, due to support for custom listeners. Returns zero if no port number is
121 func (cl *Client) LocalPort() (port int) {
122 for i := 0; i < len(cl.listeners); i += 1 {
123 if port = addrPortOrZero(cl.listeners[i].Addr()); port != 0 {
130 func writeDhtServerStatus(w io.Writer, s DhtServer) {
131 dhtStats := s.Stats()
132 fmt.Fprintf(w, " ID: %x\n", s.ID())
133 spew.Fdump(w, dhtStats)
136 // Writes out a human readable status of the client, such as for writing to a
138 func (cl *Client) WriteStatus(_w io.Writer) {
141 w := bufio.NewWriter(_w)
143 fmt.Fprintf(w, "Listen port: %d\n", cl.LocalPort())
144 fmt.Fprintf(w, "Peer ID: %+q\n", cl.PeerID())
145 fmt.Fprintf(w, "Extension bits: %v\n", cl.config.Extensions)
146 fmt.Fprintf(w, "Announce key: %x\n", cl.announceKey())
147 fmt.Fprintf(w, "Banned IPs: %d\n", len(cl.badPeerIPsLocked()))
148 cl.eachDhtServer(func(s DhtServer) {
149 fmt.Fprintf(w, "%s DHT server at %s:\n", s.Addr().Network(), s.Addr().String())
150 writeDhtServerStatus(w, s)
152 dumpStats(w, cl.statsLocked())
153 torrentsSlice := cl.torrentsAsSlice()
154 fmt.Fprintf(w, "# Torrents: %d\n", len(torrentsSlice))
156 sort.Slice(torrentsSlice, func(l, r int) bool {
157 return torrentsSlice[l].infoHash.AsString() < torrentsSlice[r].infoHash.AsString()
159 for _, t := range torrentsSlice {
161 fmt.Fprint(w, "<unknown name>")
163 fmt.Fprint(w, t.name())
169 "%f%% of %d bytes (%s)",
170 100*(1-float64(t.bytesMissingLocked())/float64(t.info.TotalLength())),
172 humanize.Bytes(uint64(t.length())))
174 w.WriteString("<missing metainfo>")
182 func (cl *Client) initLogger() {
183 logger := cl.config.Logger
188 logger = logger.FilterLevel(log.Debug)
190 cl.logger = logger.WithValues(cl)
193 func (cl *Client) announceKey() int32 {
194 return int32(binary.BigEndian.Uint32(cl.peerID[16:20]))
197 // Initializes a bare minimum Client. *Client and *ClientConfig must not be nil.
198 func (cl *Client) init(cfg *ClientConfig) {
200 g.MakeMap(&cl.dopplegangerAddrs)
201 cl.torrents = make(map[metainfo.Hash]*Torrent)
202 cl.activeAnnounceLimiter.SlotsPerKey = 2
203 cl.event.L = cl.locker()
204 cl.ipBlockList = cfg.IPBlocklist
205 cl.httpClient = &http.Client{
206 Transport: cfg.WebTransport,
208 if cl.httpClient.Transport == nil {
209 cl.httpClient.Transport = &http.Transport{
210 Proxy: cfg.HTTPProxy,
211 DialContext: cfg.HTTPDialContext,
212 // I think this value was observed from some webseeds. It seems reasonable to extend it
213 // to other uses of HTTP from the client.
219 func NewClient(cfg *ClientConfig) (cl *Client, err error) {
221 cfg = NewDefaultClientConfig()
227 go cl.acceptLimitClearer()
236 storageImpl := cfg.DefaultStorage
237 if storageImpl == nil {
238 // We'd use mmap by default but HFS+ doesn't support sparse files.
239 storageImplCloser := storage.NewFile(cfg.DataDir)
240 cl.onClose = append(cl.onClose, func() {
241 if err := storageImplCloser.Close(); err != nil {
242 cl.logger.Printf("error closing default storage: %s", err)
245 storageImpl = storageImplCloser
247 cl.defaultStorage = storage.NewClient(storageImpl)
249 if cfg.PeerID != "" {
250 missinggo.CopyExact(&cl.peerID, cfg.PeerID)
252 o := copy(cl.peerID[:], cfg.Bep20)
253 _, err = rand.Read(cl.peerID[o:])
255 panic("error generating peer id")
259 builtinListenNetworks := cl.listenNetworks()
260 sockets, err := listenAll(
261 builtinListenNetworks,
262 cl.config.ListenHost,
263 cl.config.ListenPort,
270 if len(sockets) == 0 && len(builtinListenNetworks) != 0 {
271 err = fmt.Errorf("no sockets created for networks %v", builtinListenNetworks)
278 for _, _s := range sockets {
279 s := _s // Go is fucking retarded.
280 cl.onClose = append(cl.onClose, func() { go s.Close() })
281 if peerNetworkEnabled(parseNetworkString(s.Addr().Network()), cl.config) {
282 cl.dialers = append(cl.dialers, s)
283 cl.listeners = append(cl.listeners, s)
284 if cl.config.AcceptPeerConnections {
285 go cl.acceptConnections(s)
292 for _, s := range sockets {
293 if pc, ok := s.(net.PacketConn); ok {
294 ds, err := cl.NewAnacrolixDhtServer(pc)
298 cl.dhtServers = append(cl.dhtServers, AnacrolixDhtServerWrapper{ds})
299 cl.onClose = append(cl.onClose, func() { ds.Close() })
304 cl.websocketTrackers = websocketTrackers{
307 GetAnnounceRequest: func(event tracker.AnnounceEvent, infoHash [20]byte) (tracker.AnnounceRequest, error) {
310 t, ok := cl.torrents[infoHash]
312 return tracker.AnnounceRequest{}, errors.New("torrent not tracked by client")
314 return t.announceRequest(event), nil
316 Proxy: cl.config.HTTPProxy,
317 WebsocketTrackerHttpHeader: cl.config.WebsocketTrackerHttpHeader,
318 ICEServers: cl.config.ICEServers,
319 DialContext: cl.config.TrackerDialContext,
320 OnConn: func(dc datachannel.ReadWriteCloser, dcc webtorrent.DataChannelContext) {
323 t, ok := cl.torrents[dcc.InfoHash]
325 cl.logger.WithDefaultLevel(log.Warning).Printf(
326 "got webrtc conn for unloaded torrent with infohash %x",
332 go t.onWebRtcConn(dc, dcc)
339 func (cl *Client) AddDhtServer(d DhtServer) {
340 cl.dhtServers = append(cl.dhtServers, d)
343 // Adds a Dialer for outgoing connections. All Dialers are used when attempting to connect to a
344 // given address for any Torrent.
345 func (cl *Client) AddDialer(d Dialer) {
348 cl.dialers = append(cl.dialers, d)
349 for _, t := range cl.torrents {
354 func (cl *Client) Listeners() []Listener {
358 // Registers a Listener, and starts Accepting on it. You must Close Listeners provided this way
360 func (cl *Client) AddListener(l Listener) {
361 cl.listeners = append(cl.listeners, l)
362 if cl.config.AcceptPeerConnections {
363 go cl.acceptConnections(l)
367 func (cl *Client) firewallCallback(net.Addr) bool {
369 block := !cl.wantConns() || !cl.config.AcceptPeerConnections
372 torrent.Add("connections firewalled", 1)
374 torrent.Add("connections not firewalled", 1)
379 func (cl *Client) listenOnNetwork(n network) bool {
380 if n.Ipv4 && cl.config.DisableIPv4 {
383 if n.Ipv6 && cl.config.DisableIPv6 {
386 if n.Tcp && cl.config.DisableTCP {
389 if n.Udp && cl.config.DisableUTP && cl.config.NoDHT {
395 func (cl *Client) listenNetworks() (ns []network) {
396 for _, n := range allPeerNetworks {
397 if cl.listenOnNetwork(n) {
404 // Creates an anacrolix/dht Server, as would be done internally in NewClient, for the given conn.
405 func (cl *Client) NewAnacrolixDhtServer(conn net.PacketConn) (s *dht.Server, err error) {
406 logger := cl.logger.WithNames("dht", conn.LocalAddr().String())
407 cfg := dht.ServerConfig{
408 IPBlocklist: cl.ipBlockList,
410 OnAnnouncePeer: cl.onDHTAnnouncePeer,
411 PublicIP: func() net.IP {
412 if connIsIpv6(conn) && cl.config.PublicIp6 != nil {
413 return cl.config.PublicIp6
415 return cl.config.PublicIp4
417 StartingNodes: cl.config.DhtStartingNodes(conn.LocalAddr().Network()),
418 OnQuery: cl.config.DHTOnQuery,
421 if f := cl.config.ConfigureAnacrolixDhtServer; f != nil {
424 s, err = dht.NewServer(&cfg)
426 go s.TableMaintainer()
431 func (cl *Client) Closed() events.Done {
432 return cl.closed.Done()
435 func (cl *Client) eachDhtServer(f func(DhtServer)) {
436 for _, ds := range cl.dhtServers {
441 // Stops the client. All connections to peers are closed and all activity will come to a halt.
442 func (cl *Client) Close() (errs []error) {
443 var closeGroup sync.WaitGroup // For concurrent cleanup to complete before returning
445 for _, t := range cl.torrents {
446 err := t.close(&closeGroup)
448 errs = append(errs, err)
451 for i := range cl.onClose {
452 cl.onClose[len(cl.onClose)-1-i]()
457 closeGroup.Wait() // defer is LIFO. We want to Wait() after cl.unlock()
461 func (cl *Client) ipBlockRange(ip net.IP) (r iplist.Range, blocked bool) {
462 if cl.ipBlockList == nil {
465 return cl.ipBlockList.Lookup(ip)
468 func (cl *Client) ipIsBlocked(ip net.IP) bool {
469 _, blocked := cl.ipBlockRange(ip)
473 func (cl *Client) wantConns() bool {
474 if cl.config.AlwaysWantConns {
477 for _, t := range cl.torrents {
478 if t.wantIncomingConns() {
485 // TODO: Apply filters for non-standard networks, particularly rate-limiting.
486 func (cl *Client) rejectAccepted(conn net.Conn) error {
488 return errors.New("don't want conns right now")
490 ra := conn.RemoteAddr()
491 if rip := addrIpOrNil(ra); rip != nil {
492 if cl.config.DisableIPv4Peers && rip.To4() != nil {
493 return errors.New("ipv4 peers disabled")
495 if cl.config.DisableIPv4 && len(rip) == net.IPv4len {
496 return errors.New("ipv4 disabled")
498 if cl.config.DisableIPv6 && len(rip) == net.IPv6len && rip.To4() == nil {
499 return errors.New("ipv6 disabled")
501 if cl.rateLimitAccept(rip) {
502 return errors.New("source IP accepted rate limited")
504 if cl.badPeerIPPort(rip, missinggo.AddrPort(ra)) {
505 return errors.New("bad source addr")
511 func (cl *Client) acceptConnections(l Listener) {
513 conn, err := l.Accept()
514 torrent.Add("client listener accepts", 1)
516 holepunchAddr, holepunchErr := addrPortFromPeerRemoteAddr(conn.RemoteAddr())
517 if holepunchErr == nil {
519 if g.MapContains(cl.undialableWithoutHolepunch, holepunchAddr) {
520 setAdd(&cl.accepted, holepunchAddr)
523 cl.undialableWithoutHolepunchDialedAfterHolepunchConnect,
526 setAdd(&cl.probablyOnlyConnectedDueToHolepunch, holepunchAddr)
531 conn = pproffd.WrapNetConn(conn)
533 closed := cl.closed.IsSet()
535 if !closed && conn != nil {
536 reject = cl.rejectAccepted(conn)
546 log.Fmsg("error accepting connection: %s", err).LogLevel(log.Debug, cl.logger)
551 torrent.Add("rejected accepted connections", 1)
552 cl.logger.LazyLog(log.Debug, func() log.Msg {
553 return log.Fmsg("rejecting accepted conn: %v", reject)
557 go cl.incomingConnection(conn)
559 cl.logger.LazyLog(log.Debug, func() log.Msg {
560 return log.Fmsg("accepted %q connection at %q from %q",
566 torrent.Add(fmt.Sprintf("accepted conn remote IP len=%d", len(addrIpOrNil(conn.RemoteAddr()))), 1)
567 torrent.Add(fmt.Sprintf("accepted conn network=%s", conn.RemoteAddr().Network()), 1)
568 torrent.Add(fmt.Sprintf("accepted on %s listener", l.Addr().Network()), 1)
573 // Creates the PeerConn.connString for a regular net.Conn PeerConn.
574 func regularNetConnPeerConnConnString(nc net.Conn) string {
575 return fmt.Sprintf("%s-%s", nc.LocalAddr(), nc.RemoteAddr())
578 func (cl *Client) incomingConnection(nc net.Conn) {
580 if tc, ok := nc.(*net.TCPConn); ok {
583 remoteAddr, _ := tryIpPortFromNetAddr(nc.RemoteAddr())
584 c := cl.newConnection(
588 remoteAddr: nc.RemoteAddr(),
589 localPublicAddr: cl.publicAddr(remoteAddr.IP),
590 network: nc.RemoteAddr().Network(),
591 connString: regularNetConnPeerConnConnString(nc),
598 c.Discovery = PeerSourceIncoming
599 cl.runReceivedConn(c)
602 // Returns a handle to the given torrent, if it's present in the client.
603 func (cl *Client) Torrent(ih metainfo.Hash) (t *Torrent, ok bool) {
606 t, ok = cl.torrents[ih]
610 func (cl *Client) torrent(ih metainfo.Hash) *Torrent {
611 return cl.torrents[ih]
614 type DialResult struct {
619 func countDialResult(err error) {
621 torrent.Add("successful dials", 1)
623 torrent.Add("unsuccessful dials", 1)
627 func reducedDialTimeout(minDialTimeout, max time.Duration, halfOpenLimit, pendingPeers int) (ret time.Duration) {
628 ret = max / time.Duration((pendingPeers+halfOpenLimit)/halfOpenLimit)
629 if ret < minDialTimeout {
635 // Returns whether an address is known to connect to a client with our own ID.
636 func (cl *Client) dopplegangerAddr(addr string) bool {
637 _, ok := cl.dopplegangerAddrs[addr]
641 // Returns a connection over UTP or TCP, whichever is first to connect.
642 func (cl *Client) dialFirst(ctx context.Context, addr string) (res DialResult) {
643 return DialFirst(ctx, addr, cl.dialers)
646 // Returns a connection over UTP or TCP, whichever is first to connect.
647 func DialFirst(ctx context.Context, addr string, dialers []Dialer) (res DialResult) {
651 defer pool.startDrainer()
652 for _, _s := range dialers {
655 return pool.getFirst()
658 func dialFromSocket(ctx context.Context, s Dialer, addr string) net.Conn {
659 c, err := s.Dial(ctx, addr)
661 log.Levelf(log.Debug, "error dialing %q: %v", addr, err)
663 // This is a bit optimistic, but it looks non-trivial to thread this through the proxy code. Set
664 // it now in case we close the connection forthwith. Note this is also done in the TCP dialer
665 // code to increase the chance it's done.
666 if tc, ok := c.(*net.TCPConn); ok {
673 func (cl *Client) noLongerHalfOpen(t *Torrent, addr string, attemptKey outgoingConnAttemptKey) {
674 path := t.getHalfOpenPath(addr, attemptKey)
676 panic("should exist")
680 if cl.numHalfOpen < 0 {
681 panic("should not be possible")
683 for _, t := range cl.torrents {
688 func (cl *Client) countHalfOpenFromTorrents() (count int) {
689 for _, t := range cl.torrents {
690 count += t.numHalfOpenAttempts()
695 // Performs initiator handshakes and returns a connection. Returns nil *PeerConn if no connection
696 // for valid reasons.
697 func (cl *Client) initiateProtocolHandshakes(
702 newConnOpts newConnectionOpts,
704 c *PeerConn, err error,
706 c = cl.newConnection(nc, newConnOpts)
707 c.headerEncrypted = encryptHeader
708 ctx, cancel := context.WithTimeout(ctx, cl.config.HandshakesTimeout)
710 dl, ok := ctx.Deadline()
714 err = nc.SetDeadline(dl)
718 err = cl.initiateHandshakes(c, t)
722 func doProtocolHandshakeOnDialResult(
724 obfuscatedHeader bool,
728 c *PeerConn, err error,
732 addrIpPort, _ := tryIpPortFromNetAddr(addr)
733 c, err = cl.initiateProtocolHandshakes(
734 context.Background(), nc, t, obfuscatedHeader,
738 // It would be possible to retrieve a public IP from the dialer used here?
739 localPublicAddr: cl.publicAddr(addrIpPort.IP),
740 network: dr.Dialer.DialerNetwork(),
741 connString: regularNetConnPeerConnConnString(nc),
749 // Returns nil connection and nil error if no connection could be established for valid reasons.
750 func (cl *Client) dialAndCompleteHandshake(opts outgoingConnOpts) (c *PeerConn, err error) {
751 // It would be better if dial rate limiting could be tested when considering to open connections
752 // instead. Doing it here means if the limit is low, and the half-open limit is high, we could
753 // end up with lots of outgoing connection attempts pending that were initiated on stale data.
755 dialReservation := cl.config.DialRateLimiter.Reserve()
756 if !opts.receivedHolepunchConnect {
757 if !dialReservation.OK() {
758 err = errors.New("can't make dial limit reservation")
761 time.Sleep(dialReservation.Delay())
764 torrent.Add("establish outgoing connection", 1)
765 addr := opts.peerInfo.Addr
766 dialPool := dialPool{
767 resCh: make(chan DialResult),
770 defer dialPool.startDrainer()
771 dialTimeout := opts.t.getDialTimeoutUnlocked()
773 ctx, cancel := context.WithTimeout(context.Background(), dialTimeout)
775 for _, d := range cl.dialers {
779 holepunchAddr, holepunchAddrErr := addrPortFromPeerRemoteAddr(addr)
780 headerObfuscationPolicy := opts.HeaderObfuscationPolicy
781 obfuscatedHeaderFirst := headerObfuscationPolicy.Preferred
782 firstDialResult := dialPool.getFirst()
783 if firstDialResult.Conn == nil {
784 // No dialers worked. Try to initiate a holepunching rendezvous.
785 if holepunchAddrErr == nil {
787 if !opts.receivedHolepunchConnect {
788 g.MakeMapIfNilAndSet(&cl.undialableWithoutHolepunch, holepunchAddr, struct{}{})
790 if !opts.skipHolepunchRendezvous {
791 opts.t.trySendHolepunchRendezvous(holepunchAddr)
795 err = fmt.Errorf("all initial dials failed")
798 if opts.receivedHolepunchConnect && holepunchAddrErr == nil {
800 if g.MapContains(cl.undialableWithoutHolepunch, holepunchAddr) {
801 g.MakeMapIfNilAndSet(&cl.dialableOnlyAfterHolepunch, holepunchAddr, struct{}{})
803 g.MakeMapIfNil(&cl.dialedSuccessfullyAfterHolepunchConnect)
804 g.MapInsert(cl.dialedSuccessfullyAfterHolepunchConnect, holepunchAddr, struct{}{})
807 c, err = doProtocolHandshakeOnDialResult(
809 obfuscatedHeaderFirst,
814 torrent.Add("initiated conn with preferred header obfuscation", 1)
819 "error doing protocol handshake with header obfuscation %v",
820 obfuscatedHeaderFirst,
822 firstDialResult.Conn.Close()
823 // We should have just tried with the preferred header obfuscation. If it was required, there's nothing else to try.
824 if headerObfuscationPolicy.RequirePreferred {
827 // Reuse the dialer that returned already but failed to handshake.
829 ctx, cancel := context.WithTimeout(context.Background(), dialTimeout)
831 dialPool.add(ctx, firstDialResult.Dialer)
833 secondDialResult := dialPool.getFirst()
834 if secondDialResult.Conn == nil {
837 c, err = doProtocolHandshakeOnDialResult(
839 !obfuscatedHeaderFirst,
844 torrent.Add("initiated conn with fallback header obfuscation", 1)
849 "error doing protocol handshake with header obfuscation %v",
850 !obfuscatedHeaderFirst,
852 secondDialResult.Conn.Close()
856 type outgoingConnOpts struct {
859 // Don't attempt to connect unless a connect message is received after initiating a rendezvous.
860 requireRendezvous bool
861 // Don't send rendezvous requests to eligible relays.
862 skipHolepunchRendezvous bool
863 // Outgoing connection attempt is in response to holepunch connect message.
864 receivedHolepunchConnect bool
865 HeaderObfuscationPolicy HeaderObfuscationPolicy
868 // Called to dial out and run a connection. The addr we're given is already
869 // considered half-open.
870 func (cl *Client) outgoingConnection(
871 opts outgoingConnOpts,
872 attemptKey outgoingConnAttemptKey,
874 c, err := cl.dialAndCompleteHandshake(opts)
876 c.conn.SetWriteDeadline(time.Time{})
880 // Don't release lock between here and addPeerConn, unless it's for failure.
881 cl.noLongerHalfOpen(opts.t, opts.peerInfo.Addr.String(), attemptKey)
886 "error establishing outgoing connection to %v: %v",
894 c.Discovery = opts.peerInfo.Source
895 c.trusted = opts.peerInfo.Trusted
896 opts.t.runHandshookConnLoggingErr(c)
899 // The port number for incoming peer connections. 0 if the client isn't listening.
900 func (cl *Client) incomingPeerPort() int {
901 return cl.LocalPort()
904 func (cl *Client) initiateHandshakes(c *PeerConn, t *Torrent) error {
905 if c.headerEncrypted {
908 rw, c.cryptoMethod, err = mse.InitiateHandshake(
915 cl.config.CryptoProvides,
919 return fmt.Errorf("header obfuscation handshake: %w", err)
922 ih, err := cl.connBtHandshake(c, &t.infoHash)
924 return fmt.Errorf("bittorrent protocol handshake: %w", err)
926 if ih != t.infoHash {
927 return errors.New("bittorrent protocol handshake: peer infohash didn't match")
932 // Calls f with any secret keys. Note that it takes the Client lock, and so must be used from code
933 // that won't also try to take the lock. This saves us copying all the infohashes everytime.
934 func (cl *Client) forSkeys(f func([]byte) bool) {
937 if false { // Emulate the bug from #114
939 for ih := range cl.torrents {
943 for range cl.torrents {
950 for ih := range cl.torrents {
957 func (cl *Client) handshakeReceiverSecretKeys() mse.SecretKeyIter {
958 if ret := cl.config.Callbacks.ReceiveEncryptedHandshakeSkeys; ret != nil {
964 // Do encryption and bittorrent handshakes as receiver.
965 func (cl *Client) receiveHandshakes(c *PeerConn) (t *Torrent, err error) {
966 defer perf.ScopeTimerErr(&err)()
968 rw, c.headerEncrypted, c.cryptoMethod, err = handleEncryption(c.rw(), cl.handshakeReceiverSecretKeys(), cl.config.HeaderObfuscationPolicy, cl.config.CryptoSelector)
970 if err == nil || err == mse.ErrNoSecretKeyMatch {
971 if c.headerEncrypted {
972 torrent.Add("handshakes received encrypted", 1)
974 torrent.Add("handshakes received unencrypted", 1)
977 torrent.Add("handshakes received with error while handling encryption", 1)
980 if err == mse.ErrNoSecretKeyMatch {
985 if cl.config.HeaderObfuscationPolicy.RequirePreferred && c.headerEncrypted != cl.config.HeaderObfuscationPolicy.Preferred {
986 err = errors.New("connection does not have required header obfuscation")
989 ih, err := cl.connBtHandshake(c, nil)
991 return nil, fmt.Errorf("during bt handshake: %w", err)
999 var successfulPeerWireProtocolHandshakePeerReservedBytes expvar.Map
1003 "successful_peer_wire_protocol_handshake_peer_reserved_bytes",
1004 &successfulPeerWireProtocolHandshakePeerReservedBytes)
1007 func (cl *Client) connBtHandshake(c *PeerConn, ih *metainfo.Hash) (ret metainfo.Hash, err error) {
1008 res, err := pp.Handshake(c.rw(), ih, cl.peerID, cl.config.Extensions)
1012 successfulPeerWireProtocolHandshakePeerReservedBytes.Add(
1013 hex.EncodeToString(res.PeerExtensionBits[:]), 1)
1015 c.PeerExtensionBytes = res.PeerExtensionBits
1016 c.PeerID = res.PeerID
1017 c.completedHandshake = time.Now()
1018 if cb := cl.config.Callbacks.CompletedHandshake; cb != nil {
1024 func (cl *Client) runReceivedConn(c *PeerConn) {
1025 err := c.conn.SetDeadline(time.Now().Add(cl.config.HandshakesTimeout))
1029 t, err := cl.receiveHandshakes(c)
1031 cl.logger.LazyLog(log.Debug, func() log.Msg {
1033 "error receiving handshakes on %v: %s", c, err,
1035 "network", c.Network,
1038 torrent.Add("error receiving handshake", 1)
1040 cl.onBadAccept(c.RemoteAddr)
1045 torrent.Add("received handshake for unloaded torrent", 1)
1046 cl.logger.LazyLog(log.Debug, func() log.Msg {
1047 return log.Fmsg("received handshake for unloaded torrent")
1050 cl.onBadAccept(c.RemoteAddr)
1054 torrent.Add("received handshake for loaded torrent", 1)
1055 c.conn.SetWriteDeadline(time.Time{})
1058 t.runHandshookConnLoggingErr(c)
1061 // Client lock must be held before entering this.
1062 func (t *Torrent) runHandshookConn(pc *PeerConn) error {
1065 for i, b := range cl.config.MinPeerExtensions {
1066 if pc.PeerExtensionBytes[i]&b != b {
1067 return fmt.Errorf("peer did not meet minimum peer extensions: %x", pc.PeerExtensionBytes[:])
1070 if pc.PeerID == cl.peerID {
1073 addr := pc.RemoteAddr.String()
1074 cl.dopplegangerAddrs[addr] = struct{}{}
1076 // Because the remote address is not necessarily the same as its client's torrent listen
1077 // address, we won't record the remote address as a doppleganger. Instead, the initiator
1078 // can record *us* as the doppleganger.
1080 t.logger.Levelf(log.Debug, "local and remote peer ids are the same")
1083 pc.r = deadlineReader{pc.conn, pc.r}
1084 completedHandshakeConnectionFlags.Add(pc.connectionFlags(), 1)
1085 if connIsIpv6(pc.conn) {
1086 torrent.Add("completed handshake over ipv6", 1)
1088 if err := t.addPeerConn(pc); err != nil {
1089 return fmt.Errorf("adding connection: %w", err)
1091 defer t.dropConnection(pc)
1092 pc.startMessageWriter()
1093 pc.sendInitialMessages()
1094 pc.initUpdateRequestsTimer()
1095 err := pc.mainReadLoop()
1097 return fmt.Errorf("main read loop: %w", err)
1102 func (p *Peer) initUpdateRequestsTimer() {
1104 if p.updateRequestsTimer != nil {
1105 panic(p.updateRequestsTimer)
1108 if enableUpdateRequestsTimer {
1109 p.updateRequestsTimer = time.AfterFunc(math.MaxInt64, p.updateRequestsTimerFunc)
1113 const peerUpdateRequestsTimerReason = "updateRequestsTimer"
1115 func (c *Peer) updateRequestsTimerFunc() {
1117 defer c.locker().Unlock()
1118 if c.closed.IsSet() {
1121 if c.isLowOnRequests() {
1122 // If there are no outstanding requests, then a request update should have already run.
1125 if d := time.Since(c.lastRequestUpdate); d < updateRequestsTimerDuration {
1126 // These should be benign, Timer.Stop doesn't guarantee that its function won't run if it's
1127 // already been fired.
1128 torrent.Add("spurious timer requests updates", 1)
1131 c.updateRequests(peerUpdateRequestsTimerReason)
1134 // Maximum pending requests we allow peers to send us. If peer requests are buffered on read, this
1135 // instructs the amount of memory that might be used to cache pending writes. Assuming 512KiB
1136 // (1<<19) cached for sending, for 16KiB (1<<14) chunks.
1137 const localClientReqq = 1024
1139 // See the order given in Transmission's tr_peerMsgsNew.
1140 func (pc *PeerConn) sendInitialMessages() {
1143 if pc.PeerExtensionBytes.SupportsExtended() && cl.config.Extensions.SupportsExtended() {
1144 pc.write(pp.Message{
1146 ExtendedID: pp.HandshakeExtendedID,
1147 ExtendedPayload: func() []byte {
1148 msg := pp.ExtendedHandshakeMessage{
1149 M: map[pp.ExtensionName]pp.ExtensionNumber{
1150 pp.ExtensionNameMetadata: metadataExtendedId,
1151 utHolepunch.ExtensionName: utHolepunchExtendedId,
1153 V: cl.config.ExtendedHandshakeClientVersion,
1154 Reqq: localClientReqq,
1155 YourIp: pp.CompactIp(pc.remoteIp()),
1156 Encryption: cl.config.HeaderObfuscationPolicy.Preferred || !cl.config.HeaderObfuscationPolicy.RequirePreferred,
1157 Port: cl.incomingPeerPort(),
1158 MetadataSize: t.metadataSize(),
1159 // TODO: We can figure these out specific to the socket used.
1160 Ipv4: pp.CompactIp(cl.config.PublicIp4.To4()),
1161 Ipv6: cl.config.PublicIp6.To16(),
1163 if !cl.config.DisablePEX {
1164 msg.M[pp.ExtensionNamePex] = pexExtendedId
1166 return bencode.MustMarshal(msg)
1171 if pc.fastEnabled() {
1172 if t.haveAllPieces() {
1173 pc.write(pp.Message{Type: pp.HaveAll})
1174 pc.sentHaves.AddRange(0, bitmap.BitRange(pc.t.NumPieces()))
1176 } else if !t.haveAnyPieces() {
1177 pc.write(pp.Message{Type: pp.HaveNone})
1178 pc.sentHaves.Clear()
1184 if pc.PeerExtensionBytes.SupportsDHT() && cl.config.Extensions.SupportsDHT() && cl.haveDhtServer() {
1185 pc.write(pp.Message{
1192 func (cl *Client) dhtPort() (ret uint16) {
1193 if len(cl.dhtServers) == 0 {
1196 return uint16(missinggo.AddrPort(cl.dhtServers[len(cl.dhtServers)-1].Addr()))
1199 func (cl *Client) haveDhtServer() bool {
1200 return len(cl.dhtServers) > 0
1203 // Process incoming ut_metadata message.
1204 func (cl *Client) gotMetadataExtensionMsg(payload []byte, t *Torrent, c *PeerConn) error {
1205 var d pp.ExtendedMetadataRequestMsg
1206 err := bencode.Unmarshal(payload, &d)
1207 if _, ok := err.(bencode.ErrUnusedTrailingBytes); ok {
1208 } else if err != nil {
1209 return fmt.Errorf("error unmarshalling bencode: %s", err)
1213 case pp.DataMetadataExtensionMsgType:
1214 c.allStats(add(1, func(cs *ConnStats) *Count { return &cs.MetadataChunksRead }))
1215 if !c.requestedMetadataPiece(piece) {
1216 return fmt.Errorf("got unexpected piece %d", piece)
1218 c.metadataRequests[piece] = false
1219 begin := len(payload) - d.PieceSize()
1220 if begin < 0 || begin >= len(payload) {
1221 return fmt.Errorf("data has bad offset in payload: %d", begin)
1223 t.saveMetadataPiece(piece, payload[begin:])
1224 c.lastUsefulChunkReceived = time.Now()
1225 err = t.maybeCompleteMetadata()
1227 // Log this at the Torrent-level, as we don't partition metadata by Peer yet, so we
1228 // don't know who to blame. TODO: Also errors can be returned here that aren't related
1229 // to verifying metadata, which should be fixed. This should be tagged with metadata, so
1230 // log consumers can filter for this message.
1231 t.logger.WithDefaultLevel(log.Warning).Printf("error completing metadata: %v", err)
1234 case pp.RequestMetadataExtensionMsgType:
1235 if !t.haveMetadataPiece(piece) {
1236 c.write(t.newMetadataExtensionMessage(c, pp.RejectMetadataExtensionMsgType, d.Piece, nil))
1239 start := (1 << 14) * piece
1240 c.logger.WithDefaultLevel(log.Debug).Printf("sending metadata piece %d", piece)
1241 c.write(t.newMetadataExtensionMessage(c, pp.DataMetadataExtensionMsgType, piece, t.metadataBytes[start:start+t.metadataPieceSize(piece)]))
1243 case pp.RejectMetadataExtensionMsgType:
1246 return errors.New("unknown msg_type value")
1250 func (cl *Client) badPeerAddr(addr PeerRemoteAddr) bool {
1251 if ipa, ok := tryIpPortFromNetAddr(addr); ok {
1252 return cl.badPeerIPPort(ipa.IP, ipa.Port)
1257 // Returns whether the IP address and port are considered "bad".
1258 func (cl *Client) badPeerIPPort(ip net.IP, port int) bool {
1259 if port == 0 || ip == nil {
1262 if cl.dopplegangerAddr(net.JoinHostPort(ip.String(), strconv.FormatInt(int64(port), 10))) {
1265 if _, ok := cl.ipBlockRange(ip); ok {
1268 ipAddr, ok := netip.AddrFromSlice(ip)
1272 if _, ok := cl.badPeerIPs[ipAddr]; ok {
1278 // Return a Torrent ready for insertion into a Client.
1279 func (cl *Client) newTorrent(ih metainfo.Hash, specStorage storage.ClientImpl) (t *Torrent) {
1280 return cl.newTorrentOpt(AddTorrentOpts{
1282 Storage: specStorage,
1286 // Return a Torrent ready for insertion into a Client.
1287 func (cl *Client) newTorrentOpt(opts AddTorrentOpts) (t *Torrent) {
1288 // use provided storage, if provided
1289 storageClient := cl.defaultStorage
1290 if opts.Storage != nil {
1291 storageClient = storage.NewClient(opts.Storage)
1296 infoHash: opts.InfoHash,
1297 peers: prioritizedPeers{
1299 getPrio: func(p PeerInfo) peerPriority {
1301 return bep40PriorityIgnoreError(cl.publicAddr(ipPort.IP), ipPort)
1304 conns: make(map[*PeerConn]struct{}, 2*cl.config.EstablishedConnsPerTorrent),
1306 storageOpener: storageClient,
1307 maxEstablishedConns: cl.config.EstablishedConnsPerTorrent,
1309 metadataChanged: sync.Cond{
1312 webSeeds: make(map[string]*Peer),
1313 gotMetainfoC: make(chan struct{}),
1317 t.smartBanCache.Hash = func(b []byte) uint64 {
1323 t.smartBanCache.Init()
1324 t.networkingEnabled.Set()
1325 t.logger = cl.logger.WithDefaultLevel(log.Debug)
1326 t.sourcesLogger = t.logger.WithNames("sources")
1327 if opts.ChunkSize == 0 {
1328 opts.ChunkSize = defaultChunkSize
1330 t.setChunkSize(opts.ChunkSize)
1334 // A file-like handle to some torrent data resource.
1335 type Handle interface {
1342 func (cl *Client) AddTorrentInfoHash(infoHash metainfo.Hash) (t *Torrent, new bool) {
1343 return cl.AddTorrentInfoHashWithStorage(infoHash, nil)
1346 // Adds a torrent by InfoHash with a custom Storage implementation.
1347 // If the torrent already exists then this Storage is ignored and the
1348 // existing torrent returned with `new` set to `false`
1349 func (cl *Client) AddTorrentInfoHashWithStorage(infoHash metainfo.Hash, specStorage storage.ClientImpl) (t *Torrent, new bool) {
1352 t, ok := cl.torrents[infoHash]
1358 t = cl.newTorrent(infoHash, specStorage)
1359 cl.eachDhtServer(func(s DhtServer) {
1360 if cl.config.PeriodicallyAnnounceTorrentsToDht {
1361 go t.dhtAnnouncer(s)
1364 cl.torrents[infoHash] = t
1365 cl.clearAcceptLimits()
1366 t.updateWantPeersEvent()
1367 // Tickle Client.waitAccept, new torrent may want conns.
1368 cl.event.Broadcast()
1372 // Adds a torrent by InfoHash with a custom Storage implementation. If the torrent already exists
1373 // then this Storage is ignored and the existing torrent returned with `new` set to `false`.
1374 func (cl *Client) AddTorrentOpt(opts AddTorrentOpts) (t *Torrent, new bool) {
1375 infoHash := opts.InfoHash
1378 t, ok := cl.torrents[infoHash]
1384 t = cl.newTorrentOpt(opts)
1385 cl.eachDhtServer(func(s DhtServer) {
1386 if cl.config.PeriodicallyAnnounceTorrentsToDht {
1387 go t.dhtAnnouncer(s)
1390 cl.torrents[infoHash] = t
1391 t.setInfoBytesLocked(opts.InfoBytes)
1392 cl.clearAcceptLimits()
1393 t.updateWantPeersEvent()
1394 // Tickle Client.waitAccept, new torrent may want conns.
1395 cl.event.Broadcast()
1399 type AddTorrentOpts struct {
1401 Storage storage.ClientImpl
1402 ChunkSize pp.Integer
1406 // Add or merge a torrent spec. Returns new if the torrent wasn't already in the client. See also
1407 // Torrent.MergeSpec.
1408 func (cl *Client) AddTorrentSpec(spec *TorrentSpec) (t *Torrent, new bool, err error) {
1409 t, new = cl.AddTorrentOpt(AddTorrentOpts{
1410 InfoHash: spec.InfoHash,
1411 Storage: spec.Storage,
1412 ChunkSize: spec.ChunkSize,
1416 // ChunkSize was already applied by adding a new Torrent, and MergeSpec disallows changing
1418 modSpec.ChunkSize = 0
1420 err = t.MergeSpec(&modSpec)
1421 if err != nil && new {
1427 // The trackers will be merged with the existing ones. If the Info isn't yet known, it will be set.
1428 // spec.DisallowDataDownload/Upload will be read and applied
1429 // The display name is replaced if the new spec provides one. Note that any `Storage` is ignored.
1430 func (t *Torrent) MergeSpec(spec *TorrentSpec) error {
1431 if spec.DisplayName != "" {
1432 t.SetDisplayName(spec.DisplayName)
1434 if spec.InfoBytes != nil {
1435 err := t.SetInfoBytes(spec.InfoBytes)
1441 cl.AddDhtNodes(spec.DhtNodes)
1442 t.UseSources(spec.Sources)
1445 t.initialPieceCheckDisabled = spec.DisableInitialPieceCheck
1446 for _, url := range spec.Webseeds {
1449 for _, peerAddr := range spec.PeerAddrs {
1451 Addr: StringAddr(peerAddr),
1452 Source: PeerSourceDirect,
1456 if spec.ChunkSize != 0 {
1457 panic("chunk size cannot be changed for existing Torrent")
1459 t.addTrackers(spec.Trackers)
1461 t.dataDownloadDisallowed.SetBool(spec.DisallowDataDownload)
1462 t.dataUploadDisallowed = spec.DisallowDataUpload
1466 func (cl *Client) dropTorrent(infoHash metainfo.Hash, wg *sync.WaitGroup) (err error) {
1467 t, ok := cl.torrents[infoHash]
1469 err = fmt.Errorf("no such torrent")
1473 delete(cl.torrents, infoHash)
1477 func (cl *Client) allTorrentsCompleted() bool {
1478 for _, t := range cl.torrents {
1482 if !t.haveAllPieces() {
1489 // Returns true when all torrents are completely downloaded and false if the
1490 // client is stopped before that.
1491 func (cl *Client) WaitAll() bool {
1494 for !cl.allTorrentsCompleted() {
1495 if cl.closed.IsSet() {
1503 // Returns handles to all the torrents loaded in the Client.
1504 func (cl *Client) Torrents() []*Torrent {
1507 return cl.torrentsAsSlice()
1510 func (cl *Client) torrentsAsSlice() (ret []*Torrent) {
1511 for _, t := range cl.torrents {
1512 ret = append(ret, t)
1517 func (cl *Client) AddMagnet(uri string) (T *Torrent, err error) {
1518 spec, err := TorrentSpecFromMagnetUri(uri)
1522 T, _, err = cl.AddTorrentSpec(spec)
1526 func (cl *Client) AddTorrent(mi *metainfo.MetaInfo) (T *Torrent, err error) {
1527 ts, err := TorrentSpecFromMetaInfoErr(mi)
1531 T, _, err = cl.AddTorrentSpec(ts)
1535 func (cl *Client) AddTorrentFromFile(filename string) (T *Torrent, err error) {
1536 mi, err := metainfo.LoadFromFile(filename)
1540 return cl.AddTorrent(mi)
1543 func (cl *Client) DhtServers() []DhtServer {
1544 return cl.dhtServers
1547 func (cl *Client) AddDhtNodes(nodes []string) {
1548 for _, n := range nodes {
1549 hmp := missinggo.SplitHostMaybePort(n)
1550 ip := net.ParseIP(hmp.Host)
1552 cl.logger.Printf("won't add DHT node with bad IP: %q", hmp.Host)
1555 ni := krpc.NodeInfo{
1556 Addr: krpc.NodeAddr{
1561 cl.eachDhtServer(func(s DhtServer) {
1567 func (cl *Client) banPeerIP(ip net.IP) {
1568 // We can't take this from string, because it will lose netip's v4on6. net.ParseIP parses v4
1569 // addresses directly to v4on6, which doesn't compare equal with v4.
1570 ipAddr, ok := netip.AddrFromSlice(ip)
1574 g.MakeMapIfNilAndSet(&cl.badPeerIPs, ipAddr, struct{}{})
1575 for _, t := range cl.torrents {
1576 t.iterPeers(func(p *Peer) {
1577 if p.remoteIp().Equal(ip) {
1578 t.logger.Levelf(log.Warning, "dropping peer %v with banned ip %v", p, ip)
1579 // Should this be a close?
1586 type newConnectionOpts struct {
1588 remoteAddr PeerRemoteAddr
1589 localPublicAddr peerLocalPublicAddr
1594 func (cl *Client) newConnection(nc net.Conn, opts newConnectionOpts) (c *PeerConn) {
1595 if opts.network == "" {
1596 panic(opts.remoteAddr)
1600 outgoing: opts.outgoing,
1603 PeerMaxRequests: 250,
1605 RemoteAddr: opts.remoteAddr,
1606 localPublicAddr: opts.localPublicAddr,
1607 Network: opts.network,
1608 callbacks: &cl.config.Callbacks,
1610 connString: opts.connString,
1613 c.peerRequestDataAllocLimiter.Max = cl.config.MaxAllocPeerRequestDataPerConn
1614 c.initRequestState()
1615 // TODO: Need to be much more explicit about this, including allowing non-IP bannable addresses.
1616 if opts.remoteAddr != nil {
1617 netipAddrPort, err := netip.ParseAddrPort(opts.remoteAddr.String())
1619 c.bannableAddr = Some(netipAddrPort.Addr())
1623 c.logger = cl.logger.WithDefaultLevel(log.Warning)
1624 c.logger = c.logger.WithContextText(fmt.Sprintf("%T %p", c, c))
1625 c.setRW(connStatsReadWriter{nc, c})
1626 c.r = &rateLimitedReader{
1627 l: cl.config.DownloadRateLimiter,
1632 "inited with remoteAddr %v network %v outgoing %t",
1633 opts.remoteAddr, opts.network, opts.outgoing,
1635 for _, f := range cl.config.Callbacks.NewPeer {
1641 func (cl *Client) onDHTAnnouncePeer(ih metainfo.Hash, ip net.IP, port int, portOk bool) {
1648 t.addPeers([]PeerInfo{{
1649 Addr: ipPortAddr{ip, port},
1650 Source: PeerSourceDhtAnnouncePeer,
1654 func firstNotNil(ips ...net.IP) net.IP {
1655 for _, ip := range ips {
1663 func (cl *Client) eachListener(f func(Listener) bool) {
1664 for _, s := range cl.listeners {
1671 func (cl *Client) findListener(f func(Listener) bool) (ret Listener) {
1672 for i := 0; i < len(cl.listeners); i += 1 {
1673 if ret = cl.listeners[i]; f(ret) {
1680 func (cl *Client) publicIp(peer net.IP) net.IP {
1681 // TODO: Use BEP 10 to determine how peers are seeing us.
1682 if peer.To4() != nil {
1684 cl.config.PublicIp4,
1685 cl.findListenerIp(func(ip net.IP) bool { return ip.To4() != nil }),
1690 cl.config.PublicIp6,
1691 cl.findListenerIp(func(ip net.IP) bool { return ip.To4() == nil }),
1695 func (cl *Client) findListenerIp(f func(net.IP) bool) net.IP {
1696 l := cl.findListener(
1697 func(l Listener) bool {
1698 return f(addrIpOrNil(l.Addr()))
1704 return addrIpOrNil(l.Addr())
1707 // Our IP as a peer should see it.
1708 func (cl *Client) publicAddr(peer net.IP) IpPort {
1709 return IpPort{IP: cl.publicIp(peer), Port: uint16(cl.incomingPeerPort())}
1712 // ListenAddrs addresses currently being listened to.
1713 func (cl *Client) ListenAddrs() (ret []net.Addr) {
1715 ret = make([]net.Addr, len(cl.listeners))
1716 for i := 0; i < len(cl.listeners); i += 1 {
1717 ret[i] = cl.listeners[i].Addr()
1723 func (cl *Client) PublicIPs() (ips []net.IP) {
1724 if ip := cl.config.PublicIp4; ip != nil {
1725 ips = append(ips, ip)
1727 if ip := cl.config.PublicIp6; ip != nil {
1728 ips = append(ips, ip)
1733 func (cl *Client) onBadAccept(addr PeerRemoteAddr) {
1734 ipa, ok := tryIpPortFromNetAddr(addr)
1738 ip := maskIpForAcceptLimiting(ipa.IP)
1739 if cl.acceptLimiter == nil {
1740 cl.acceptLimiter = make(map[ipStr]int)
1742 cl.acceptLimiter[ipStr(ip.String())]++
1745 func maskIpForAcceptLimiting(ip net.IP) net.IP {
1746 if ip4 := ip.To4(); ip4 != nil {
1747 return ip4.Mask(net.CIDRMask(24, 32))
1752 func (cl *Client) clearAcceptLimits() {
1753 cl.acceptLimiter = nil
1756 func (cl *Client) acceptLimitClearer() {
1759 case <-cl.closed.Done():
1761 case <-time.After(15 * time.Minute):
1763 cl.clearAcceptLimits()
1769 func (cl *Client) rateLimitAccept(ip net.IP) bool {
1770 if cl.config.DisableAcceptRateLimiting {
1773 return cl.acceptLimiter[ipStr(maskIpForAcceptLimiting(ip).String())] > 0
1776 func (cl *Client) rLock() {
1780 func (cl *Client) rUnlock() {
1784 func (cl *Client) lock() {
1788 func (cl *Client) unlock() {
1792 func (cl *Client) locker() *lockWithDeferreds {
1796 func (cl *Client) String() string {
1797 return fmt.Sprintf("<%[1]T %[1]p>", cl)
1800 // Returns connection-level aggregate connStats at the Client level. See the comment on
1801 // TorrentStats.ConnStats.
1802 func (cl *Client) ConnStats() ConnStats {
1803 return cl.connStats.Copy()
1806 func (cl *Client) Stats() ClientStats {
1809 return cl.statsLocked()