22 "github.com/anacrolix/torrent/internal/panicif"
24 "github.com/anacrolix/chansync"
25 "github.com/anacrolix/chansync/events"
26 "github.com/anacrolix/dht/v2"
27 "github.com/anacrolix/dht/v2/krpc"
28 . "github.com/anacrolix/generics"
29 g "github.com/anacrolix/generics"
30 "github.com/anacrolix/log"
31 "github.com/anacrolix/missinggo/perf"
32 "github.com/anacrolix/missinggo/v2"
33 "github.com/anacrolix/missinggo/v2/bitmap"
34 "github.com/anacrolix/missinggo/v2/pproffd"
35 "github.com/anacrolix/sync"
36 "github.com/davecgh/go-spew/spew"
37 "github.com/dustin/go-humanize"
38 gbtree "github.com/google/btree"
39 "github.com/pion/datachannel"
40 "golang.org/x/time/rate"
42 "github.com/anacrolix/torrent/bencode"
43 "github.com/anacrolix/torrent/internal/check"
44 "github.com/anacrolix/torrent/internal/limiter"
45 "github.com/anacrolix/torrent/iplist"
46 "github.com/anacrolix/torrent/metainfo"
47 "github.com/anacrolix/torrent/mse"
48 pp "github.com/anacrolix/torrent/peer_protocol"
49 utHolepunch "github.com/anacrolix/torrent/peer_protocol/ut-holepunch"
50 request_strategy "github.com/anacrolix/torrent/request-strategy"
51 "github.com/anacrolix/torrent/storage"
52 "github.com/anacrolix/torrent/tracker"
53 "github.com/anacrolix/torrent/types/infohash"
54 "github.com/anacrolix/torrent/webtorrent"
57 // Clients contain zero or more Torrents. A Client manages a blocklist, the
58 // TCP/UDP protocol ports, and DHT as desired.
60 // An aggregate of stats over all connections. First in struct to ensure 64-bit alignment of
66 closed chansync.SetOnce
72 defaultStorage *storage.Client
76 dhtServers []DhtServer
77 ipBlockList iplist.Ranger
79 // Set of addresses that have our client ID. This intentionally will
80 // include ourselves if we end up trying to connect to our own address
81 // through legitimate channels.
82 dopplegangerAddrs map[string]struct{}
83 badPeerIPs map[netip.Addr]struct{}
84 torrents map[InfoHash]*Torrent
85 pieceRequestOrder map[interface{}]*request_strategy.PieceRequestOrder
87 acceptLimiter map[ipStr]int
88 dialRateLimiter *rate.Limiter
91 websocketTrackers websocketTrackers
93 activeAnnounceLimiter limiter.Instance
94 httpClient *http.Client
96 undialableWithoutHolepunch map[netip.AddrPort]struct{}
97 undialableWithoutHolepunchDialAttemptedAfterHolepunchConnect map[netip.AddrPort]struct{}
98 dialableOnlyAfterHolepunch map[netip.AddrPort]struct{}
103 func (cl *Client) BadPeerIPs() (ips []string) {
105 ips = cl.badPeerIPsLocked()
110 func (cl *Client) badPeerIPsLocked() (ips []string) {
111 ips = make([]string, len(cl.badPeerIPs))
113 for k := range cl.badPeerIPs {
120 func (cl *Client) PeerID() PeerID {
124 // Returns the port number for the first listener that has one. No longer assumes that all port
125 // numbers are the same, due to support for custom listeners. Returns zero if no port number is
127 func (cl *Client) LocalPort() (port int) {
128 for i := 0; i < len(cl.listeners); i += 1 {
129 if port = addrPortOrZero(cl.listeners[i].Addr()); port != 0 {
136 func writeDhtServerStatus(w io.Writer, s DhtServer) {
137 dhtStats := s.Stats()
138 fmt.Fprintf(w, " ID: %x\n", s.ID())
139 spew.Fdump(w, dhtStats)
142 // Writes out a human readable status of the client, such as for writing to a
144 func (cl *Client) WriteStatus(_w io.Writer) {
147 w := bufio.NewWriter(_w)
149 fmt.Fprintf(w, "Listen port: %d\n", cl.LocalPort())
150 fmt.Fprintf(w, "Peer ID: %+q\n", cl.PeerID())
151 fmt.Fprintf(w, "Extension bits: %v\n", cl.config.Extensions)
152 fmt.Fprintf(w, "Announce key: %x\n", cl.announceKey())
153 fmt.Fprintf(w, "Banned IPs: %d\n", len(cl.badPeerIPsLocked()))
154 cl.eachDhtServer(func(s DhtServer) {
155 fmt.Fprintf(w, "%s DHT server at %s:\n", s.Addr().Network(), s.Addr().String())
156 writeDhtServerStatus(w, s)
158 dumpStats(w, cl.statsLocked())
159 torrentsSlice := cl.torrentsAsSlice()
160 fmt.Fprintf(w, "# Torrents: %d\n", len(torrentsSlice))
162 sort.Slice(torrentsSlice, func(l, r int) bool {
163 return torrentsSlice[l].infoHash.AsString() < torrentsSlice[r].infoHash.AsString()
165 for _, t := range torrentsSlice {
167 fmt.Fprint(w, "<unknown name>")
169 fmt.Fprint(w, t.name())
175 "%f%% of %d bytes (%s)",
176 100*(1-float64(t.bytesMissingLocked())/float64(t.info.TotalLength())),
178 humanize.Bytes(uint64(t.length())))
180 w.WriteString("<missing metainfo>")
188 func (cl *Client) initLogger() {
189 logger := cl.config.Logger
194 logger = logger.FilterLevel(log.Debug)
196 cl.logger = logger.WithValues(cl)
199 func (cl *Client) announceKey() int32 {
200 return int32(binary.BigEndian.Uint32(cl.peerID[16:20]))
203 // Initializes a bare minimum Client. *Client and *ClientConfig must not be nil.
204 func (cl *Client) init(cfg *ClientConfig) {
206 g.MakeMap(&cl.dopplegangerAddrs)
207 cl.torrents = make(map[metainfo.Hash]*Torrent)
208 cl.dialRateLimiter = rate.NewLimiter(10, 10)
209 cl.activeAnnounceLimiter.SlotsPerKey = 2
210 cl.event.L = cl.locker()
211 cl.ipBlockList = cfg.IPBlocklist
212 cl.httpClient = &http.Client{
213 Transport: &http.Transport{
214 Proxy: cfg.HTTPProxy,
215 DialContext: cfg.HTTPDialContext,
216 // I think this value was observed from some webseeds. It seems reasonable to extend it
217 // to other uses of HTTP from the client.
223 func NewClient(cfg *ClientConfig) (cl *Client, err error) {
225 cfg = NewDefaultClientConfig()
231 go cl.acceptLimitClearer()
240 storageImpl := cfg.DefaultStorage
241 if storageImpl == nil {
242 // We'd use mmap by default but HFS+ doesn't support sparse files.
243 storageImplCloser := storage.NewFile(cfg.DataDir)
244 cl.onClose = append(cl.onClose, func() {
245 if err := storageImplCloser.Close(); err != nil {
246 cl.logger.Printf("error closing default storage: %s", err)
249 storageImpl = storageImplCloser
251 cl.defaultStorage = storage.NewClient(storageImpl)
253 if cfg.PeerID != "" {
254 missinggo.CopyExact(&cl.peerID, cfg.PeerID)
256 o := copy(cl.peerID[:], cfg.Bep20)
257 _, err = rand.Read(cl.peerID[o:])
259 panic("error generating peer id")
263 sockets, err := listenAll(cl.listenNetworks(), cl.config.ListenHost, cl.config.ListenPort, cl.firewallCallback, cl.logger)
271 for _, _s := range sockets {
272 s := _s // Go is fucking retarded.
273 cl.onClose = append(cl.onClose, func() { go s.Close() })
274 if peerNetworkEnabled(parseNetworkString(s.Addr().Network()), cl.config) {
275 cl.dialers = append(cl.dialers, s)
276 cl.listeners = append(cl.listeners, s)
277 if cl.config.AcceptPeerConnections {
278 go cl.acceptConnections(s)
285 for _, s := range sockets {
286 if pc, ok := s.(net.PacketConn); ok {
287 ds, err := cl.NewAnacrolixDhtServer(pc)
291 cl.dhtServers = append(cl.dhtServers, AnacrolixDhtServerWrapper{ds})
292 cl.onClose = append(cl.onClose, func() { ds.Close() })
297 cl.websocketTrackers = websocketTrackers{
300 GetAnnounceRequest: func(event tracker.AnnounceEvent, infoHash [20]byte) (tracker.AnnounceRequest, error) {
303 t, ok := cl.torrents[infoHash]
305 return tracker.AnnounceRequest{}, errors.New("torrent not tracked by client")
307 return t.announceRequest(event), nil
309 Proxy: cl.config.HTTPProxy,
310 WebsocketTrackerHttpHeader: cl.config.WebsocketTrackerHttpHeader,
311 DialContext: cl.config.TrackerDialContext,
312 OnConn: func(dc datachannel.ReadWriteCloser, dcc webtorrent.DataChannelContext) {
315 t, ok := cl.torrents[dcc.InfoHash]
317 cl.logger.WithDefaultLevel(log.Warning).Printf(
318 "got webrtc conn for unloaded torrent with infohash %x",
324 go t.onWebRtcConn(dc, dcc)
331 func (cl *Client) AddDhtServer(d DhtServer) {
332 cl.dhtServers = append(cl.dhtServers, d)
335 // Adds a Dialer for outgoing connections. All Dialers are used when attempting to connect to a
336 // given address for any Torrent.
337 func (cl *Client) AddDialer(d Dialer) {
340 cl.dialers = append(cl.dialers, d)
341 for _, t := range cl.torrents {
346 func (cl *Client) Listeners() []Listener {
350 // Registers a Listener, and starts Accepting on it. You must Close Listeners provided this way
352 func (cl *Client) AddListener(l Listener) {
353 cl.listeners = append(cl.listeners, l)
354 if cl.config.AcceptPeerConnections {
355 go cl.acceptConnections(l)
359 func (cl *Client) firewallCallback(net.Addr) bool {
361 block := !cl.wantConns() || !cl.config.AcceptPeerConnections
364 torrent.Add("connections firewalled", 1)
366 torrent.Add("connections not firewalled", 1)
371 func (cl *Client) listenOnNetwork(n network) bool {
372 if n.Ipv4 && cl.config.DisableIPv4 {
375 if n.Ipv6 && cl.config.DisableIPv6 {
378 if n.Tcp && cl.config.DisableTCP {
381 if n.Udp && cl.config.DisableUTP && cl.config.NoDHT {
387 func (cl *Client) listenNetworks() (ns []network) {
388 for _, n := range allPeerNetworks {
389 if cl.listenOnNetwork(n) {
396 // Creates an anacrolix/dht Server, as would be done internally in NewClient, for the given conn.
397 func (cl *Client) NewAnacrolixDhtServer(conn net.PacketConn) (s *dht.Server, err error) {
398 logger := cl.logger.WithNames("dht", conn.LocalAddr().String())
399 cfg := dht.ServerConfig{
400 IPBlocklist: cl.ipBlockList,
402 OnAnnouncePeer: cl.onDHTAnnouncePeer,
403 PublicIP: func() net.IP {
404 if connIsIpv6(conn) && cl.config.PublicIp6 != nil {
405 return cl.config.PublicIp6
407 return cl.config.PublicIp4
409 StartingNodes: cl.config.DhtStartingNodes(conn.LocalAddr().Network()),
410 OnQuery: cl.config.DHTOnQuery,
413 if f := cl.config.ConfigureAnacrolixDhtServer; f != nil {
416 s, err = dht.NewServer(&cfg)
418 go s.TableMaintainer()
423 func (cl *Client) Closed() events.Done {
424 return cl.closed.Done()
427 func (cl *Client) eachDhtServer(f func(DhtServer)) {
428 for _, ds := range cl.dhtServers {
433 // Stops the client. All connections to peers are closed and all activity will come to a halt.
434 func (cl *Client) Close() (errs []error) {
435 var closeGroup sync.WaitGroup // For concurrent cleanup to complete before returning
437 for _, t := range cl.torrents {
438 err := t.close(&closeGroup)
440 errs = append(errs, err)
443 for i := range cl.onClose {
444 cl.onClose[len(cl.onClose)-1-i]()
449 closeGroup.Wait() // defer is LIFO. We want to Wait() after cl.unlock()
453 func (cl *Client) ipBlockRange(ip net.IP) (r iplist.Range, blocked bool) {
454 if cl.ipBlockList == nil {
457 return cl.ipBlockList.Lookup(ip)
460 func (cl *Client) ipIsBlocked(ip net.IP) bool {
461 _, blocked := cl.ipBlockRange(ip)
465 func (cl *Client) wantConns() bool {
466 if cl.config.AlwaysWantConns {
469 for _, t := range cl.torrents {
470 if t.wantIncomingConns() {
477 // TODO: Apply filters for non-standard networks, particularly rate-limiting.
478 func (cl *Client) rejectAccepted(conn net.Conn) error {
480 return errors.New("don't want conns right now")
482 ra := conn.RemoteAddr()
483 if rip := addrIpOrNil(ra); rip != nil {
484 if cl.config.DisableIPv4Peers && rip.To4() != nil {
485 return errors.New("ipv4 peers disabled")
487 if cl.config.DisableIPv4 && len(rip) == net.IPv4len {
488 return errors.New("ipv4 disabled")
490 if cl.config.DisableIPv6 && len(rip) == net.IPv6len && rip.To4() == nil {
491 return errors.New("ipv6 disabled")
493 if cl.rateLimitAccept(rip) {
494 return errors.New("source IP accepted rate limited")
496 if cl.badPeerIPPort(rip, missinggo.AddrPort(ra)) {
497 return errors.New("bad source addr")
503 func (cl *Client) acceptConnections(l Listener) {
505 conn, err := l.Accept()
506 torrent.Add("client listener accepts", 1)
507 conn = pproffd.WrapNetConn(conn)
509 closed := cl.closed.IsSet()
511 if !closed && conn != nil {
512 reject = cl.rejectAccepted(conn)
522 log.Fmsg("error accepting connection: %s", err).LogLevel(log.Debug, cl.logger)
527 torrent.Add("rejected accepted connections", 1)
528 cl.logger.LazyLog(log.Debug, func() log.Msg {
529 return log.Fmsg("rejecting accepted conn: %v", reject)
533 go cl.incomingConnection(conn)
535 cl.logger.LazyLog(log.Debug, func() log.Msg {
536 return log.Fmsg("accepted %q connection at %q from %q",
542 torrent.Add(fmt.Sprintf("accepted conn remote IP len=%d", len(addrIpOrNil(conn.RemoteAddr()))), 1)
543 torrent.Add(fmt.Sprintf("accepted conn network=%s", conn.RemoteAddr().Network()), 1)
544 torrent.Add(fmt.Sprintf("accepted on %s listener", l.Addr().Network()), 1)
549 // Creates the PeerConn.connString for a regular net.Conn PeerConn.
550 func regularNetConnPeerConnConnString(nc net.Conn) string {
551 return fmt.Sprintf("%s-%s", nc.LocalAddr(), nc.RemoteAddr())
554 func (cl *Client) incomingConnection(nc net.Conn) {
556 if tc, ok := nc.(*net.TCPConn); ok {
559 remoteAddr, _ := tryIpPortFromNetAddr(nc.RemoteAddr())
560 c := cl.newConnection(
564 remoteAddr: nc.RemoteAddr(),
565 localPublicAddr: cl.publicAddr(remoteAddr.IP),
566 network: nc.RemoteAddr().Network(),
567 connString: regularNetConnPeerConnConnString(nc),
574 c.Discovery = PeerSourceIncoming
575 cl.runReceivedConn(c)
578 // Returns a handle to the given torrent, if it's present in the client.
579 func (cl *Client) Torrent(ih metainfo.Hash) (t *Torrent, ok bool) {
582 t, ok = cl.torrents[ih]
586 func (cl *Client) torrent(ih metainfo.Hash) *Torrent {
587 return cl.torrents[ih]
590 type DialResult struct {
595 func countDialResult(err error) {
597 torrent.Add("successful dials", 1)
599 torrent.Add("unsuccessful dials", 1)
603 func reducedDialTimeout(minDialTimeout, max time.Duration, halfOpenLimit, pendingPeers int) (ret time.Duration) {
604 ret = max / time.Duration((pendingPeers+halfOpenLimit)/halfOpenLimit)
605 if ret < minDialTimeout {
611 // Returns whether an address is known to connect to a client with our own ID.
612 func (cl *Client) dopplegangerAddr(addr string) bool {
613 _, ok := cl.dopplegangerAddrs[addr]
617 // Returns a connection over UTP or TCP, whichever is first to connect.
618 func (cl *Client) dialFirst(ctx context.Context, addr string) (res DialResult) {
619 return DialFirst(ctx, addr, cl.dialers)
622 // Returns a connection over UTP or TCP, whichever is first to connect.
623 func DialFirst(ctx context.Context, addr string, dialers []Dialer) (res DialResult) {
625 t := perf.NewTimer(perf.CallerName(0))
628 t.Mark(fmt.Sprintf("returned no conn (context: %v)", ctx.Err()))
630 t.Mark("returned conn over " + res.Dialer.DialerNetwork())
634 ctx, cancel := context.WithCancel(ctx)
635 // As soon as we return one connection, cancel the others.
638 resCh := make(chan DialResult, left)
639 for _, _s := range dialers {
644 dialFromSocket(ctx, s, addr),
649 // Wait for a successful connection.
651 defer perf.ScopeTimer()()
652 for ; left > 0 && res.Conn == nil; left-- {
656 // There are still uncompleted dials.
658 for ; left > 0; left-- {
659 conn := (<-resCh).Conn
666 go torrent.Add(fmt.Sprintf("network dialed first: %s", res.Conn.RemoteAddr().Network()), 1)
671 func dialFromSocket(ctx context.Context, s Dialer, addr string) net.Conn {
672 c, err := s.Dial(ctx, addr)
674 log.Levelf(log.Debug, "error dialing %q: %v", addr, err)
676 // This is a bit optimistic, but it looks non-trivial to thread this through the proxy code. Set
677 // it now in case we close the connection forthwith. Note this is also done in the TCP dialer
678 // code to increase the chance it's done.
679 if tc, ok := c.(*net.TCPConn); ok {
686 func (cl *Client) noLongerHalfOpen(t *Torrent, addr string, attemptKey outgoingConnAttemptKey) {
687 path := t.getHalfOpenPath(addr, attemptKey)
689 panic("should exist")
693 if cl.numHalfOpen < 0 {
694 panic("should not be possible")
696 for _, t := range cl.torrents {
701 func (cl *Client) countHalfOpenFromTorrents() (count int) {
702 for _, t := range cl.torrents {
703 count += t.numHalfOpenAttempts()
708 // Performs initiator handshakes and returns a connection. Returns nil *PeerConn if no connection
709 // for valid reasons.
710 func (cl *Client) initiateProtocolHandshakes(
715 newConnOpts newConnectionOpts,
717 c *PeerConn, err error,
719 c = cl.newConnection(nc, newConnOpts)
720 c.headerEncrypted = encryptHeader
721 ctx, cancel := context.WithTimeout(ctx, cl.config.HandshakesTimeout)
723 dl, ok := ctx.Deadline()
727 err = nc.SetDeadline(dl)
731 err = cl.initiateHandshakes(c, t)
735 func (cl *Client) waitForRendezvousConnect(ctx context.Context, rz *utHolepunchRendezvous) error {
738 case rz.gotConnect.IsSet():
740 case len(rz.relays) == 0:
741 return errors.New("all relays failed")
742 case ctx.Err() != nil:
743 return context.Cause(ctx)
745 relayCond := rz.relayCond.Signaled()
748 case <-rz.gotConnect.Done():
756 // Returns nil connection and nil error if no connection could be established for valid reasons.
757 func (cl *Client) initiateRendezvousConnect(
758 t *Torrent, holepunchAddr netip.AddrPort,
759 ) (ok bool, err error) {
762 rz, err := t.startHolepunchRendezvous(holepunchAddr)
770 ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
772 err = cl.waitForRendezvousConnect(ctx, rz)
773 delete(t.utHolepunchRendezvous, holepunchAddr)
775 err = fmt.Errorf("waiting for rendezvous connect signal: %w", err)
780 // Returns nil connection and nil error if no connection could be established for valid reasons.
781 func (cl *Client) establishOutgoingConnEx(
782 opts outgoingConnOpts,
783 obfuscatedHeader bool,
785 _ *PeerConn, err error,
789 holepunchAddr, err := addrPortFromPeerRemoteAddr(addr)
790 var sentRendezvous bool
792 if !opts.skipHolepunchRendezvous {
793 sentRendezvous, err = cl.initiateRendezvousConnect(t, holepunchAddr)
795 err = fmt.Errorf("initiating rendezvous connect: %w", err)
799 gotHolepunchConnect := (err == nil && sentRendezvous) || opts.receivedHolepunchConnect
800 if opts.requireRendezvous && !sentRendezvous {
806 dialCtx, cancel := context.WithTimeout(context.Background(), func() time.Duration {
809 return t.dialTimeout()
812 dr := cl.dialFirst(dialCtx, addr.String())
815 if gotHolepunchConnect && g.MapContains(cl.undialableWithoutHolepunch, holepunchAddr) {
816 g.MakeMapIfNilAndSet(
817 &cl.undialableWithoutHolepunchDialAttemptedAfterHolepunchConnect,
824 if !sentRendezvous && !gotHolepunchConnect {
826 g.MakeMapIfNilAndSet(&cl.undialableWithoutHolepunch, holepunchAddr, struct{}{})
829 if dialCtx.Err() != nil {
830 return nil, fmt.Errorf("dialing: %w", dialCtx.Err())
832 return nil, errors.New("dial failed")
834 if gotHolepunchConnect {
835 panicif.False(holepunchAddr.IsValid())
837 if g.MapContains(cl.undialableWithoutHolepunchDialAttemptedAfterHolepunchConnect, holepunchAddr) {
838 g.MakeMapIfNilAndSet(
839 &cl.dialableOnlyAfterHolepunch,
846 addrIpPort, _ := tryIpPortFromNetAddr(addr)
847 c, err := cl.initiateProtocolHandshakes(
848 context.Background(), nc, t, obfuscatedHeader,
852 // It would be possible to retrieve a public IP from the dialer used here?
853 localPublicAddr: cl.publicAddr(addrIpPort.IP),
854 network: dr.Dialer.DialerNetwork(),
855 connString: regularNetConnPeerConnConnString(nc),
863 // Returns nil connection and nil error if no connection could be established
864 // for valid reasons.
865 func (cl *Client) establishOutgoingConn(opts outgoingConnOpts) (c *PeerConn, err error) {
866 torrent.Add("establish outgoing connection", 1)
867 obfuscatedHeaderFirst := cl.config.HeaderObfuscationPolicy.Preferred
868 c, err = cl.establishOutgoingConnEx(opts, obfuscatedHeaderFirst)
870 torrent.Add("initiated conn with preferred header obfuscation", 1)
873 // cl.logger.Printf("error establishing connection to %s (obfuscatedHeader=%t): %v", addr, obfuscatedHeaderFirst, err)
874 if cl.config.HeaderObfuscationPolicy.RequirePreferred {
875 // We should have just tried with the preferred header obfuscation. If it was required,
876 // there's nothing else to try.
879 // Try again with encryption if we didn't earlier, or without if we did.
880 c, err = cl.establishOutgoingConnEx(opts, !obfuscatedHeaderFirst)
882 torrent.Add("initiated conn with fallback header obfuscation", 1)
884 // cl.logger.Printf("error establishing fallback connection to %v: %v", addr, err)
888 type outgoingConnOpts struct {
891 // Don't attempt to connect unless a connect message is received after initiating a rendezvous.
892 requireRendezvous bool
893 // Don't send rendezvous requests to eligible relays.
894 skipHolepunchRendezvous bool
895 // Outgoing connection attempt is in response to holepunch connect message.
896 receivedHolepunchConnect bool
899 // Called to dial out and run a connection. The addr we're given is already
900 // considered half-open.
901 func (cl *Client) outgoingConnection(
902 opts outgoingConnOpts,
905 attemptKey outgoingConnAttemptKey,
907 cl.dialRateLimiter.Wait(context.Background())
908 c, err := cl.establishOutgoingConn(opts)
910 c.conn.SetWriteDeadline(time.Time{})
914 // Don't release lock between here and addPeerConn, unless it's for
916 cl.noLongerHalfOpen(opts.t, opts.addr.String(), attemptKey)
919 cl.logger.Levelf(log.Debug, "error establishing outgoing connection to %v: %v", opts.addr, err)
926 opts.t.runHandshookConnLoggingErr(c)
929 // The port number for incoming peer connections. 0 if the client isn't listening.
930 func (cl *Client) incomingPeerPort() int {
931 return cl.LocalPort()
934 func (cl *Client) initiateHandshakes(c *PeerConn, t *Torrent) error {
935 if c.headerEncrypted {
938 rw, c.cryptoMethod, err = mse.InitiateHandshake(
945 cl.config.CryptoProvides,
949 return fmt.Errorf("header obfuscation handshake: %w", err)
952 ih, err := cl.connBtHandshake(c, &t.infoHash)
954 return fmt.Errorf("bittorrent protocol handshake: %w", err)
956 if ih != t.infoHash {
957 return errors.New("bittorrent protocol handshake: peer infohash didn't match")
962 // Calls f with any secret keys. Note that it takes the Client lock, and so must be used from code
963 // that won't also try to take the lock. This saves us copying all the infohashes everytime.
964 func (cl *Client) forSkeys(f func([]byte) bool) {
967 if false { // Emulate the bug from #114
969 for ih := range cl.torrents {
973 for range cl.torrents {
980 for ih := range cl.torrents {
987 func (cl *Client) handshakeReceiverSecretKeys() mse.SecretKeyIter {
988 if ret := cl.config.Callbacks.ReceiveEncryptedHandshakeSkeys; ret != nil {
994 // Do encryption and bittorrent handshakes as receiver.
995 func (cl *Client) receiveHandshakes(c *PeerConn) (t *Torrent, err error) {
996 defer perf.ScopeTimerErr(&err)()
998 rw, c.headerEncrypted, c.cryptoMethod, err = handleEncryption(c.rw(), cl.handshakeReceiverSecretKeys(), cl.config.HeaderObfuscationPolicy, cl.config.CryptoSelector)
1000 if err == nil || err == mse.ErrNoSecretKeyMatch {
1001 if c.headerEncrypted {
1002 torrent.Add("handshakes received encrypted", 1)
1004 torrent.Add("handshakes received unencrypted", 1)
1007 torrent.Add("handshakes received with error while handling encryption", 1)
1010 if err == mse.ErrNoSecretKeyMatch {
1015 if cl.config.HeaderObfuscationPolicy.RequirePreferred && c.headerEncrypted != cl.config.HeaderObfuscationPolicy.Preferred {
1016 err = errors.New("connection does not have required header obfuscation")
1019 ih, err := cl.connBtHandshake(c, nil)
1021 return nil, fmt.Errorf("during bt handshake: %w", err)
1029 var successfulPeerWireProtocolHandshakePeerReservedBytes expvar.Map
1033 "successful_peer_wire_protocol_handshake_peer_reserved_bytes",
1034 &successfulPeerWireProtocolHandshakePeerReservedBytes)
1037 func (cl *Client) connBtHandshake(c *PeerConn, ih *metainfo.Hash) (ret metainfo.Hash, err error) {
1038 res, err := pp.Handshake(c.rw(), ih, cl.peerID, cl.config.Extensions)
1042 successfulPeerWireProtocolHandshakePeerReservedBytes.Add(
1043 hex.EncodeToString(res.PeerExtensionBits[:]), 1)
1045 c.PeerExtensionBytes = res.PeerExtensionBits
1046 c.PeerID = res.PeerID
1047 c.completedHandshake = time.Now()
1048 if cb := cl.config.Callbacks.CompletedHandshake; cb != nil {
1054 func (cl *Client) runReceivedConn(c *PeerConn) {
1055 err := c.conn.SetDeadline(time.Now().Add(cl.config.HandshakesTimeout))
1059 t, err := cl.receiveHandshakes(c)
1061 cl.logger.LazyLog(log.Debug, func() log.Msg {
1063 "error receiving handshakes on %v: %s", c, err,
1065 "network", c.Network,
1068 torrent.Add("error receiving handshake", 1)
1070 cl.onBadAccept(c.RemoteAddr)
1075 torrent.Add("received handshake for unloaded torrent", 1)
1076 cl.logger.LazyLog(log.Debug, func() log.Msg {
1077 return log.Fmsg("received handshake for unloaded torrent")
1080 cl.onBadAccept(c.RemoteAddr)
1084 torrent.Add("received handshake for loaded torrent", 1)
1085 c.conn.SetWriteDeadline(time.Time{})
1088 t.runHandshookConnLoggingErr(c)
1091 // Client lock must be held before entering this.
1092 func (cl *Client) runHandshookConn(c *PeerConn, t *Torrent) error {
1094 for i, b := range cl.config.MinPeerExtensions {
1095 if c.PeerExtensionBytes[i]&b != b {
1096 return fmt.Errorf("peer did not meet minimum peer extensions: %x", c.PeerExtensionBytes[:])
1099 if c.PeerID == cl.peerID {
1102 addr := c.RemoteAddr.String()
1103 cl.dopplegangerAddrs[addr] = struct{}{}
1105 // Because the remote address is not necessarily the same as its client's torrent listen
1106 // address, we won't record the remote address as a doppleganger. Instead, the initiator
1107 // can record *us* as the doppleganger.
1109 t.logger.Levelf(log.Debug, "local and remote peer ids are the same")
1112 c.r = deadlineReader{c.conn, c.r}
1113 completedHandshakeConnectionFlags.Add(c.connectionFlags(), 1)
1114 if connIsIpv6(c.conn) {
1115 torrent.Add("completed handshake over ipv6", 1)
1117 if err := t.addPeerConn(c); err != nil {
1118 return fmt.Errorf("adding connection: %w", err)
1120 defer t.dropConnection(c)
1121 c.startMessageWriter()
1122 cl.sendInitialMessages(c, t)
1123 c.initUpdateRequestsTimer()
1124 err := c.mainReadLoop()
1126 return fmt.Errorf("main read loop: %w", err)
1131 func (p *Peer) initUpdateRequestsTimer() {
1133 if p.updateRequestsTimer != nil {
1134 panic(p.updateRequestsTimer)
1137 if enableUpdateRequestsTimer {
1138 p.updateRequestsTimer = time.AfterFunc(math.MaxInt64, p.updateRequestsTimerFunc)
1142 const peerUpdateRequestsTimerReason = "updateRequestsTimer"
1144 func (c *Peer) updateRequestsTimerFunc() {
1146 defer c.locker().Unlock()
1147 if c.closed.IsSet() {
1150 if c.isLowOnRequests() {
1151 // If there are no outstanding requests, then a request update should have already run.
1154 if d := time.Since(c.lastRequestUpdate); d < updateRequestsTimerDuration {
1155 // These should be benign, Timer.Stop doesn't guarantee that its function won't run if it's
1156 // already been fired.
1157 torrent.Add("spurious timer requests updates", 1)
1160 c.updateRequests(peerUpdateRequestsTimerReason)
1163 // Maximum pending requests we allow peers to send us. If peer requests are buffered on read, this
1164 // instructs the amount of memory that might be used to cache pending writes. Assuming 512KiB
1165 // (1<<19) cached for sending, for 16KiB (1<<14) chunks.
1166 const localClientReqq = 1024
1168 // See the order given in Transmission's tr_peerMsgsNew.
1169 func (cl *Client) sendInitialMessages(conn *PeerConn, torrent *Torrent) {
1170 if conn.PeerExtensionBytes.SupportsExtended() && cl.config.Extensions.SupportsExtended() {
1171 conn.write(pp.Message{
1173 ExtendedID: pp.HandshakeExtendedID,
1174 ExtendedPayload: func() []byte {
1175 msg := pp.ExtendedHandshakeMessage{
1176 M: map[pp.ExtensionName]pp.ExtensionNumber{
1177 pp.ExtensionNameMetadata: metadataExtendedId,
1178 utHolepunch.ExtensionName: utHolepunchExtendedId,
1180 V: cl.config.ExtendedHandshakeClientVersion,
1181 Reqq: localClientReqq,
1182 YourIp: pp.CompactIp(conn.remoteIp()),
1183 Encryption: cl.config.HeaderObfuscationPolicy.Preferred || !cl.config.HeaderObfuscationPolicy.RequirePreferred,
1184 Port: cl.incomingPeerPort(),
1185 MetadataSize: torrent.metadataSize(),
1186 // TODO: We can figure these out specific to the socket used.
1187 Ipv4: pp.CompactIp(cl.config.PublicIp4.To4()),
1188 Ipv6: cl.config.PublicIp6.To16(),
1190 if !cl.config.DisablePEX {
1191 msg.M[pp.ExtensionNamePex] = pexExtendedId
1193 return bencode.MustMarshal(msg)
1198 if conn.fastEnabled() {
1199 if torrent.haveAllPieces() {
1200 conn.write(pp.Message{Type: pp.HaveAll})
1201 conn.sentHaves.AddRange(0, bitmap.BitRange(conn.t.NumPieces()))
1203 } else if !torrent.haveAnyPieces() {
1204 conn.write(pp.Message{Type: pp.HaveNone})
1205 conn.sentHaves.Clear()
1211 if conn.PeerExtensionBytes.SupportsDHT() && cl.config.Extensions.SupportsDHT() && cl.haveDhtServer() {
1212 conn.write(pp.Message{
1219 func (cl *Client) dhtPort() (ret uint16) {
1220 if len(cl.dhtServers) == 0 {
1223 return uint16(missinggo.AddrPort(cl.dhtServers[len(cl.dhtServers)-1].Addr()))
1226 func (cl *Client) haveDhtServer() bool {
1227 return len(cl.dhtServers) > 0
1230 // Process incoming ut_metadata message.
1231 func (cl *Client) gotMetadataExtensionMsg(payload []byte, t *Torrent, c *PeerConn) error {
1232 var d pp.ExtendedMetadataRequestMsg
1233 err := bencode.Unmarshal(payload, &d)
1234 if _, ok := err.(bencode.ErrUnusedTrailingBytes); ok {
1235 } else if err != nil {
1236 return fmt.Errorf("error unmarshalling bencode: %s", err)
1240 case pp.DataMetadataExtensionMsgType:
1241 c.allStats(add(1, func(cs *ConnStats) *Count { return &cs.MetadataChunksRead }))
1242 if !c.requestedMetadataPiece(piece) {
1243 return fmt.Errorf("got unexpected piece %d", piece)
1245 c.metadataRequests[piece] = false
1246 begin := len(payload) - d.PieceSize()
1247 if begin < 0 || begin >= len(payload) {
1248 return fmt.Errorf("data has bad offset in payload: %d", begin)
1250 t.saveMetadataPiece(piece, payload[begin:])
1251 c.lastUsefulChunkReceived = time.Now()
1252 err = t.maybeCompleteMetadata()
1254 // Log this at the Torrent-level, as we don't partition metadata by Peer yet, so we
1255 // don't know who to blame. TODO: Also errors can be returned here that aren't related
1256 // to verifying metadata, which should be fixed. This should be tagged with metadata, so
1257 // log consumers can filter for this message.
1258 t.logger.WithDefaultLevel(log.Warning).Printf("error completing metadata: %v", err)
1261 case pp.RequestMetadataExtensionMsgType:
1262 if !t.haveMetadataPiece(piece) {
1263 c.write(t.newMetadataExtensionMessage(c, pp.RejectMetadataExtensionMsgType, d.Piece, nil))
1266 start := (1 << 14) * piece
1267 c.logger.WithDefaultLevel(log.Debug).Printf("sending metadata piece %d", piece)
1268 c.write(t.newMetadataExtensionMessage(c, pp.DataMetadataExtensionMsgType, piece, t.metadataBytes[start:start+t.metadataPieceSize(piece)]))
1270 case pp.RejectMetadataExtensionMsgType:
1273 return errors.New("unknown msg_type value")
1277 func (cl *Client) badPeerAddr(addr PeerRemoteAddr) bool {
1278 if ipa, ok := tryIpPortFromNetAddr(addr); ok {
1279 return cl.badPeerIPPort(ipa.IP, ipa.Port)
1284 // Returns whether the IP address and port are considered "bad".
1285 func (cl *Client) badPeerIPPort(ip net.IP, port int) bool {
1286 if port == 0 || ip == nil {
1289 if cl.dopplegangerAddr(net.JoinHostPort(ip.String(), strconv.FormatInt(int64(port), 10))) {
1292 if _, ok := cl.ipBlockRange(ip); ok {
1295 ipAddr, ok := netip.AddrFromSlice(ip)
1299 if _, ok := cl.badPeerIPs[ipAddr]; ok {
1305 // Return a Torrent ready for insertion into a Client.
1306 func (cl *Client) newTorrent(ih metainfo.Hash, specStorage storage.ClientImpl) (t *Torrent) {
1307 return cl.newTorrentOpt(AddTorrentOpts{
1309 Storage: specStorage,
1313 // Return a Torrent ready for insertion into a Client.
1314 func (cl *Client) newTorrentOpt(opts AddTorrentOpts) (t *Torrent) {
1315 // use provided storage, if provided
1316 storageClient := cl.defaultStorage
1317 if opts.Storage != nil {
1318 storageClient = storage.NewClient(opts.Storage)
1323 infoHash: opts.InfoHash,
1324 peers: prioritizedPeers{
1326 getPrio: func(p PeerInfo) peerPriority {
1328 return bep40PriorityIgnoreError(cl.publicAddr(ipPort.IP), ipPort)
1331 conns: make(map[*PeerConn]struct{}, 2*cl.config.EstablishedConnsPerTorrent),
1333 storageOpener: storageClient,
1334 maxEstablishedConns: cl.config.EstablishedConnsPerTorrent,
1336 metadataChanged: sync.Cond{
1339 webSeeds: make(map[string]*Peer),
1340 gotMetainfoC: make(chan struct{}),
1342 t.smartBanCache.Hash = sha1.Sum
1343 t.smartBanCache.Init()
1344 t.networkingEnabled.Set()
1345 t.logger = cl.logger.WithContextValue(t).WithNames("torrent", t.infoHash.HexString()).WithDefaultLevel(log.Debug)
1346 t.sourcesLogger = t.logger.WithNames("sources")
1347 if opts.ChunkSize == 0 {
1348 opts.ChunkSize = defaultChunkSize
1350 t.setChunkSize(opts.ChunkSize)
1354 // A file-like handle to some torrent data resource.
1355 type Handle interface {
1362 func (cl *Client) AddTorrentInfoHash(infoHash metainfo.Hash) (t *Torrent, new bool) {
1363 return cl.AddTorrentInfoHashWithStorage(infoHash, nil)
1366 // Adds a torrent by InfoHash with a custom Storage implementation.
1367 // If the torrent already exists then this Storage is ignored and the
1368 // existing torrent returned with `new` set to `false`
1369 func (cl *Client) AddTorrentInfoHashWithStorage(infoHash metainfo.Hash, specStorage storage.ClientImpl) (t *Torrent, new bool) {
1372 t, ok := cl.torrents[infoHash]
1378 t = cl.newTorrent(infoHash, specStorage)
1379 cl.eachDhtServer(func(s DhtServer) {
1380 if cl.config.PeriodicallyAnnounceTorrentsToDht {
1381 go t.dhtAnnouncer(s)
1384 cl.torrents[infoHash] = t
1385 cl.clearAcceptLimits()
1386 t.updateWantPeersEvent()
1387 // Tickle Client.waitAccept, new torrent may want conns.
1388 cl.event.Broadcast()
1392 // Adds a torrent by InfoHash with a custom Storage implementation. If the torrent already exists
1393 // then this Storage is ignored and the existing torrent returned with `new` set to `false`.
1394 func (cl *Client) AddTorrentOpt(opts AddTorrentOpts) (t *Torrent, new bool) {
1395 infoHash := opts.InfoHash
1398 t, ok := cl.torrents[infoHash]
1404 t = cl.newTorrentOpt(opts)
1405 cl.eachDhtServer(func(s DhtServer) {
1406 if cl.config.PeriodicallyAnnounceTorrentsToDht {
1407 go t.dhtAnnouncer(s)
1410 cl.torrents[infoHash] = t
1411 t.setInfoBytesLocked(opts.InfoBytes)
1412 cl.clearAcceptLimits()
1413 t.updateWantPeersEvent()
1414 // Tickle Client.waitAccept, new torrent may want conns.
1415 cl.event.Broadcast()
1419 type AddTorrentOpts struct {
1421 Storage storage.ClientImpl
1422 ChunkSize pp.Integer
1426 // Add or merge a torrent spec. Returns new if the torrent wasn't already in the client. See also
1427 // Torrent.MergeSpec.
1428 func (cl *Client) AddTorrentSpec(spec *TorrentSpec) (t *Torrent, new bool, err error) {
1429 t, new = cl.AddTorrentOpt(AddTorrentOpts{
1430 InfoHash: spec.InfoHash,
1431 Storage: spec.Storage,
1432 ChunkSize: spec.ChunkSize,
1436 // ChunkSize was already applied by adding a new Torrent, and MergeSpec disallows changing
1438 modSpec.ChunkSize = 0
1440 err = t.MergeSpec(&modSpec)
1441 if err != nil && new {
1447 // The trackers will be merged with the existing ones. If the Info isn't yet known, it will be set.
1448 // spec.DisallowDataDownload/Upload will be read and applied
1449 // The display name is replaced if the new spec provides one. Note that any `Storage` is ignored.
1450 func (t *Torrent) MergeSpec(spec *TorrentSpec) error {
1451 if spec.DisplayName != "" {
1452 t.SetDisplayName(spec.DisplayName)
1454 if spec.InfoBytes != nil {
1455 err := t.SetInfoBytes(spec.InfoBytes)
1461 cl.AddDhtNodes(spec.DhtNodes)
1462 t.UseSources(spec.Sources)
1465 t.initialPieceCheckDisabled = spec.DisableInitialPieceCheck
1466 for _, url := range spec.Webseeds {
1469 for _, peerAddr := range spec.PeerAddrs {
1471 Addr: StringAddr(peerAddr),
1472 Source: PeerSourceDirect,
1476 if spec.ChunkSize != 0 {
1477 panic("chunk size cannot be changed for existing Torrent")
1479 t.addTrackers(spec.Trackers)
1481 t.dataDownloadDisallowed.SetBool(spec.DisallowDataDownload)
1482 t.dataUploadDisallowed = spec.DisallowDataUpload
1486 func (cl *Client) dropTorrent(infoHash metainfo.Hash, wg *sync.WaitGroup) (err error) {
1487 t, ok := cl.torrents[infoHash]
1489 err = fmt.Errorf("no such torrent")
1493 delete(cl.torrents, infoHash)
1497 func (cl *Client) allTorrentsCompleted() bool {
1498 for _, t := range cl.torrents {
1502 if !t.haveAllPieces() {
1509 // Returns true when all torrents are completely downloaded and false if the
1510 // client is stopped before that.
1511 func (cl *Client) WaitAll() bool {
1514 for !cl.allTorrentsCompleted() {
1515 if cl.closed.IsSet() {
1523 // Returns handles to all the torrents loaded in the Client.
1524 func (cl *Client) Torrents() []*Torrent {
1527 return cl.torrentsAsSlice()
1530 func (cl *Client) torrentsAsSlice() (ret []*Torrent) {
1531 for _, t := range cl.torrents {
1532 ret = append(ret, t)
1537 func (cl *Client) AddMagnet(uri string) (T *Torrent, err error) {
1538 spec, err := TorrentSpecFromMagnetUri(uri)
1542 T, _, err = cl.AddTorrentSpec(spec)
1546 func (cl *Client) AddTorrent(mi *metainfo.MetaInfo) (T *Torrent, err error) {
1547 ts, err := TorrentSpecFromMetaInfoErr(mi)
1551 T, _, err = cl.AddTorrentSpec(ts)
1555 func (cl *Client) AddTorrentFromFile(filename string) (T *Torrent, err error) {
1556 mi, err := metainfo.LoadFromFile(filename)
1560 return cl.AddTorrent(mi)
1563 func (cl *Client) DhtServers() []DhtServer {
1564 return cl.dhtServers
1567 func (cl *Client) AddDhtNodes(nodes []string) {
1568 for _, n := range nodes {
1569 hmp := missinggo.SplitHostMaybePort(n)
1570 ip := net.ParseIP(hmp.Host)
1572 cl.logger.Printf("won't add DHT node with bad IP: %q", hmp.Host)
1575 ni := krpc.NodeInfo{
1576 Addr: krpc.NodeAddr{
1581 cl.eachDhtServer(func(s DhtServer) {
1587 func (cl *Client) banPeerIP(ip net.IP) {
1588 // We can't take this from string, because it will lose netip's v4on6. net.ParseIP parses v4
1589 // addresses directly to v4on6, which doesn't compare equal with v4.
1590 ipAddr, ok := netip.AddrFromSlice(ip)
1594 g.MakeMapIfNilAndSet(&cl.badPeerIPs, ipAddr, struct{}{})
1595 for _, t := range cl.torrents {
1596 t.iterPeers(func(p *Peer) {
1597 if p.remoteIp().Equal(ip) {
1598 t.logger.Levelf(log.Warning, "dropping peer %v with banned ip %v", p, ip)
1599 // Should this be a close?
1606 type newConnectionOpts struct {
1608 remoteAddr PeerRemoteAddr
1609 localPublicAddr peerLocalPublicAddr
1614 func (cl *Client) newConnection(nc net.Conn, opts newConnectionOpts) (c *PeerConn) {
1615 if opts.network == "" {
1616 panic(opts.remoteAddr)
1620 outgoing: opts.outgoing,
1623 PeerMaxRequests: 250,
1625 RemoteAddr: opts.remoteAddr,
1626 localPublicAddr: opts.localPublicAddr,
1627 Network: opts.network,
1628 callbacks: &cl.config.Callbacks,
1630 connString: opts.connString,
1633 c.peerRequestDataAllocLimiter.Max = cl.config.MaxAllocPeerRequestDataPerConn
1634 c.initRequestState()
1635 // TODO: Need to be much more explicit about this, including allowing non-IP bannable addresses.
1636 if opts.remoteAddr != nil {
1637 netipAddrPort, err := netip.ParseAddrPort(opts.remoteAddr.String())
1639 c.bannableAddr = Some(netipAddrPort.Addr())
1643 c.logger = cl.logger.WithDefaultLevel(log.Warning)
1644 c.setRW(connStatsReadWriter{nc, c})
1645 c.r = &rateLimitedReader{
1646 l: cl.config.DownloadRateLimiter,
1651 "new PeerConn %p [Client %p remoteAddr %v network %v outgoing %t]",
1652 c, cl, opts.remoteAddr, opts.network, opts.outgoing,
1654 for _, f := range cl.config.Callbacks.NewPeer {
1660 func (cl *Client) onDHTAnnouncePeer(ih metainfo.Hash, ip net.IP, port int, portOk bool) {
1667 t.addPeers([]PeerInfo{{
1668 Addr: ipPortAddr{ip, port},
1669 Source: PeerSourceDhtAnnouncePeer,
1673 func firstNotNil(ips ...net.IP) net.IP {
1674 for _, ip := range ips {
1682 func (cl *Client) eachListener(f func(Listener) bool) {
1683 for _, s := range cl.listeners {
1690 func (cl *Client) findListener(f func(Listener) bool) (ret Listener) {
1691 for i := 0; i < len(cl.listeners); i += 1 {
1692 if ret = cl.listeners[i]; f(ret) {
1699 func (cl *Client) publicIp(peer net.IP) net.IP {
1700 // TODO: Use BEP 10 to determine how peers are seeing us.
1701 if peer.To4() != nil {
1703 cl.config.PublicIp4,
1704 cl.findListenerIp(func(ip net.IP) bool { return ip.To4() != nil }),
1709 cl.config.PublicIp6,
1710 cl.findListenerIp(func(ip net.IP) bool { return ip.To4() == nil }),
1714 func (cl *Client) findListenerIp(f func(net.IP) bool) net.IP {
1715 l := cl.findListener(
1716 func(l Listener) bool {
1717 return f(addrIpOrNil(l.Addr()))
1723 return addrIpOrNil(l.Addr())
1726 // Our IP as a peer should see it.
1727 func (cl *Client) publicAddr(peer net.IP) IpPort {
1728 return IpPort{IP: cl.publicIp(peer), Port: uint16(cl.incomingPeerPort())}
1731 // ListenAddrs addresses currently being listened to.
1732 func (cl *Client) ListenAddrs() (ret []net.Addr) {
1734 ret = make([]net.Addr, len(cl.listeners))
1735 for i := 0; i < len(cl.listeners); i += 1 {
1736 ret[i] = cl.listeners[i].Addr()
1742 func (cl *Client) PublicIPs() (ips []net.IP) {
1743 if ip := cl.config.PublicIp4; ip != nil {
1744 ips = append(ips, ip)
1746 if ip := cl.config.PublicIp6; ip != nil {
1747 ips = append(ips, ip)
1752 func (cl *Client) onBadAccept(addr PeerRemoteAddr) {
1753 ipa, ok := tryIpPortFromNetAddr(addr)
1757 ip := maskIpForAcceptLimiting(ipa.IP)
1758 if cl.acceptLimiter == nil {
1759 cl.acceptLimiter = make(map[ipStr]int)
1761 cl.acceptLimiter[ipStr(ip.String())]++
1764 func maskIpForAcceptLimiting(ip net.IP) net.IP {
1765 if ip4 := ip.To4(); ip4 != nil {
1766 return ip4.Mask(net.CIDRMask(24, 32))
1771 func (cl *Client) clearAcceptLimits() {
1772 cl.acceptLimiter = nil
1775 func (cl *Client) acceptLimitClearer() {
1778 case <-cl.closed.Done():
1780 case <-time.After(15 * time.Minute):
1782 cl.clearAcceptLimits()
1788 func (cl *Client) rateLimitAccept(ip net.IP) bool {
1789 if cl.config.DisableAcceptRateLimiting {
1792 return cl.acceptLimiter[ipStr(maskIpForAcceptLimiting(ip).String())] > 0
1795 func (cl *Client) rLock() {
1799 func (cl *Client) rUnlock() {
1803 func (cl *Client) lock() {
1807 func (cl *Client) unlock() {
1811 func (cl *Client) locker() *lockWithDeferreds {
1815 func (cl *Client) String() string {
1816 return fmt.Sprintf("<%[1]T %[1]p>", cl)
1819 // Returns connection-level aggregate connStats at the Client level. See the comment on
1820 // TorrentStats.ConnStats.
1821 func (cl *Client) ConnStats() ConnStats {
1822 return cl.connStats.Copy()
1825 func (cl *Client) Stats() ClientStats {
1828 return cl.statsLocked()
1831 func (cl *Client) statsLocked() (stats ClientStats) {
1832 stats.ConnStats = cl.connStats.Copy()
1833 stats.ActiveHalfOpenAttempts = cl.numHalfOpen
1834 stats.NumPeersUndialableWithoutHolepunchDialedAfterHolepunchConnect =
1835 len(cl.undialableWithoutHolepunchDialAttemptedAfterHolepunchConnect)
1836 stats.NumPeersDialableOnlyAfterHolepunch =
1837 len(cl.dialableOnlyAfterHolepunch)