21 "github.com/anacrolix/chansync"
22 "github.com/anacrolix/chansync/events"
23 "github.com/anacrolix/dht/v2"
24 "github.com/anacrolix/dht/v2/krpc"
25 . "github.com/anacrolix/generics"
26 g "github.com/anacrolix/generics"
27 "github.com/anacrolix/log"
28 "github.com/anacrolix/missinggo/perf"
29 "github.com/anacrolix/missinggo/v2"
30 "github.com/anacrolix/missinggo/v2/bitmap"
31 "github.com/anacrolix/missinggo/v2/pproffd"
32 "github.com/anacrolix/sync"
33 "github.com/cespare/xxhash"
34 "github.com/davecgh/go-spew/spew"
35 "github.com/dustin/go-humanize"
36 gbtree "github.com/google/btree"
37 "github.com/pion/datachannel"
38 "github.com/pion/webrtc/v3"
40 "github.com/anacrolix/torrent/bencode"
41 "github.com/anacrolix/torrent/internal/check"
42 "github.com/anacrolix/torrent/internal/limiter"
43 "github.com/anacrolix/torrent/iplist"
44 "github.com/anacrolix/torrent/metainfo"
45 "github.com/anacrolix/torrent/mse"
46 pp "github.com/anacrolix/torrent/peer_protocol"
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 infohash_v2 "github.com/anacrolix/torrent/types/infohash-v2"
52 "github.com/anacrolix/torrent/webtorrent"
55 // Clients contain zero or more Torrents. A Client manages a blocklist, the
56 // TCP/UDP protocol ports, and DHT as desired.
58 // An aggregate of stats over all connections. First in struct to ensure 64-bit alignment of
64 closed chansync.SetOnce
70 defaultStorage *storage.Client
74 dhtServers []DhtServer
75 ipBlockList iplist.Ranger
77 // Set of addresses that have our client ID. This intentionally will
78 // include ourselves if we end up trying to connect to our own address
79 // through legitimate channels.
80 dopplegangerAddrs map[string]struct{}
81 badPeerIPs map[netip.Addr]struct{}
83 torrents map[*Torrent]struct{}
84 // All Torrents by their short infohashes (v1 if valid, and truncated v2 if valid). Unless the
85 // info has been obtained, there's no knowing if an infohash belongs to v1 or v2.
86 torrentsByShortHash map[InfoHash]*Torrent
88 pieceRequestOrder map[interface{}]*request_strategy.PieceRequestOrder
90 acceptLimiter map[ipStr]int
93 websocketTrackers websocketTrackers
95 activeAnnounceLimiter limiter.Instance
96 httpClient *http.Client
98 clientHolepunchAddrSets
100 defaultLocalLtepProtocolMap LocalLtepProtocolMap
105 func (cl *Client) BadPeerIPs() (ips []string) {
107 ips = cl.badPeerIPsLocked()
112 func (cl *Client) badPeerIPsLocked() (ips []string) {
113 ips = make([]string, len(cl.badPeerIPs))
115 for k := range cl.badPeerIPs {
122 func (cl *Client) PeerID() PeerID {
126 // Returns the port number for the first listener that has one. No longer assumes that all port
127 // numbers are the same, due to support for custom listeners. Returns zero if no port number is
129 func (cl *Client) LocalPort() (port int) {
130 for i := 0; i < len(cl.listeners); i += 1 {
131 if port = addrPortOrZero(cl.listeners[i].Addr()); port != 0 {
138 func writeDhtServerStatus(w io.Writer, s DhtServer) {
139 dhtStats := s.Stats()
140 fmt.Fprintf(w, " ID: %x\n", s.ID())
141 spew.Fdump(w, dhtStats)
144 // Writes out a human readable status of the client, such as for writing to a
146 func (cl *Client) WriteStatus(_w io.Writer) {
149 w := bufio.NewWriter(_w)
151 fmt.Fprintf(w, "Listen port: %d\n", cl.LocalPort())
152 fmt.Fprintf(w, "Peer ID: %+q\n", cl.PeerID())
153 fmt.Fprintf(w, "Extension bits: %v\n", cl.config.Extensions)
154 fmt.Fprintf(w, "Announce key: %x\n", cl.announceKey())
155 fmt.Fprintf(w, "Banned IPs: %d\n", len(cl.badPeerIPsLocked()))
156 cl.eachDhtServer(func(s DhtServer) {
157 fmt.Fprintf(w, "%s DHT server at %s:\n", s.Addr().Network(), s.Addr().String())
158 writeDhtServerStatus(w, s)
160 dumpStats(w, cl.statsLocked())
161 torrentsSlice := cl.torrentsAsSlice()
162 fmt.Fprintf(w, "# Torrents: %d\n", len(torrentsSlice))
164 sort.Slice(torrentsSlice, func(l, r int) bool {
165 return torrentsSlice[l].canonicalShortInfohash().AsString() < torrentsSlice[r].canonicalShortInfohash().AsString()
167 for _, t := range torrentsSlice {
169 fmt.Fprint(w, "<unknown name>")
171 fmt.Fprint(w, t.name())
177 "%f%% of %d bytes (%s)",
178 100*(1-float64(t.bytesMissingLocked())/float64(t.info.TotalLength())),
180 humanize.Bytes(uint64(t.length())))
182 w.WriteString("<missing metainfo>")
190 func (cl *Client) initLogger() {
191 logger := cl.config.Logger
196 logger = logger.WithFilterLevel(log.Debug)
198 cl.logger = logger.WithValues(cl)
201 func (cl *Client) announceKey() int32 {
202 return int32(binary.BigEndian.Uint32(cl.peerID[16:20]))
205 // Initializes a bare minimum Client. *Client and *ClientConfig must not be nil.
206 func (cl *Client) init(cfg *ClientConfig) {
208 g.MakeMap(&cl.dopplegangerAddrs)
209 g.MakeMap(&cl.torrentsByShortHash)
210 g.MakeMap(&cl.torrents)
211 cl.torrentsByShortHash = make(map[metainfo.Hash]*Torrent)
212 cl.activeAnnounceLimiter.SlotsPerKey = 2
213 cl.event.L = cl.locker()
214 cl.ipBlockList = cfg.IPBlocklist
215 cl.httpClient = &http.Client{
216 Transport: cfg.WebTransport,
218 if cl.httpClient.Transport == nil {
219 cl.httpClient.Transport = &http.Transport{
220 Proxy: cfg.HTTPProxy,
221 DialContext: cfg.HTTPDialContext,
222 // I think this value was observed from some webseeds. It seems reasonable to extend it
223 // to other uses of HTTP from the client.
227 cl.defaultLocalLtepProtocolMap = makeBuiltinLtepProtocols(!cfg.DisablePEX)
230 func NewClient(cfg *ClientConfig) (cl *Client, err error) {
232 cfg = NewDefaultClientConfig()
237 go cl.acceptLimitClearer()
246 storageImpl := cfg.DefaultStorage
247 if storageImpl == nil {
248 // We'd use mmap by default but HFS+ doesn't support sparse files.
249 storageImplCloser := storage.NewFile(cfg.DataDir)
250 cl.onClose = append(cl.onClose, func() {
251 if err := storageImplCloser.Close(); err != nil {
252 cl.logger.Printf("error closing default storage: %s", err)
255 storageImpl = storageImplCloser
257 cl.defaultStorage = storage.NewClient(storageImpl)
259 if cfg.PeerID != "" {
260 missinggo.CopyExact(&cl.peerID, cfg.PeerID)
262 o := copy(cl.peerID[:], cfg.Bep20)
263 _, err = rand.Read(cl.peerID[o:])
265 panic("error generating peer id")
269 builtinListenNetworks := cl.listenNetworks()
270 sockets, err := listenAll(
271 builtinListenNetworks,
272 cl.config.ListenHost,
273 cl.config.ListenPort,
280 if len(sockets) == 0 && len(builtinListenNetworks) != 0 {
281 err = fmt.Errorf("no sockets created for networks %v", builtinListenNetworks)
288 for _, _s := range sockets {
289 s := _s // Go is fucking retarded.
290 cl.onClose = append(cl.onClose, func() { go s.Close() })
291 if peerNetworkEnabled(parseNetworkString(s.Addr().Network()), cl.config) {
292 cl.dialers = append(cl.dialers, s)
293 cl.listeners = append(cl.listeners, s)
294 if cl.config.AcceptPeerConnections {
295 go cl.acceptConnections(s)
302 for _, s := range sockets {
303 if pc, ok := s.(net.PacketConn); ok {
304 ds, err := cl.NewAnacrolixDhtServer(pc)
308 cl.dhtServers = append(cl.dhtServers, AnacrolixDhtServerWrapper{ds})
309 cl.onClose = append(cl.onClose, func() { ds.Close() })
314 cl.websocketTrackers = websocketTrackers{
317 GetAnnounceRequest: func(
318 event tracker.AnnounceEvent, infoHash [20]byte,
320 tracker.AnnounceRequest, error,
324 t, ok := cl.torrentsByShortHash[infoHash]
326 return tracker.AnnounceRequest{}, errors.New("torrent not tracked by client")
328 return t.announceRequest(event, infoHash), nil
330 Proxy: cl.config.HTTPProxy,
331 WebsocketTrackerHttpHeader: cl.config.WebsocketTrackerHttpHeader,
332 ICEServers: cl.ICEServers(),
333 DialContext: cl.config.TrackerDialContext,
334 OnConn: func(dc datachannel.ReadWriteCloser, dcc webtorrent.DataChannelContext) {
337 t, ok := cl.torrentsByShortHash[dcc.InfoHash]
339 cl.logger.WithDefaultLevel(log.Warning).Printf(
340 "got webrtc conn for unloaded torrent with infohash %x",
346 go t.onWebRtcConn(dc, dcc)
353 func (cl *Client) AddDhtServer(d DhtServer) {
354 cl.dhtServers = append(cl.dhtServers, d)
357 // Adds a Dialer for outgoing connections. All Dialers are used when attempting to connect to a
358 // given address for any Torrent.
359 func (cl *Client) AddDialer(d Dialer) {
362 cl.dialers = append(cl.dialers, d)
363 for t := range cl.torrents {
368 func (cl *Client) Listeners() []Listener {
372 // Registers a Listener, and starts Accepting on it. You must Close Listeners provided this way
374 func (cl *Client) AddListener(l Listener) {
375 cl.listeners = append(cl.listeners, l)
376 if cl.config.AcceptPeerConnections {
377 go cl.acceptConnections(l)
381 func (cl *Client) firewallCallback(net.Addr) bool {
383 block := !cl.wantConns() || !cl.config.AcceptPeerConnections
386 torrent.Add("connections firewalled", 1)
388 torrent.Add("connections not firewalled", 1)
393 func (cl *Client) listenOnNetwork(n network) bool {
394 if n.Ipv4 && cl.config.DisableIPv4 {
397 if n.Ipv6 && cl.config.DisableIPv6 {
400 if n.Tcp && cl.config.DisableTCP {
403 if n.Udp && cl.config.DisableUTP && cl.config.NoDHT {
409 func (cl *Client) listenNetworks() (ns []network) {
410 for _, n := range allPeerNetworks {
411 if cl.listenOnNetwork(n) {
418 // Creates an anacrolix/dht Server, as would be done internally in NewClient, for the given conn.
419 func (cl *Client) NewAnacrolixDhtServer(conn net.PacketConn) (s *dht.Server, err error) {
420 logger := cl.logger.WithNames("dht", conn.LocalAddr().String())
421 cfg := dht.ServerConfig{
422 IPBlocklist: cl.ipBlockList,
424 OnAnnouncePeer: cl.onDHTAnnouncePeer,
425 PublicIP: func() net.IP {
426 if connIsIpv6(conn) && cl.config.PublicIp6 != nil {
427 return cl.config.PublicIp6
429 return cl.config.PublicIp4
431 StartingNodes: cl.config.DhtStartingNodes(conn.LocalAddr().Network()),
432 OnQuery: cl.config.DHTOnQuery,
435 if f := cl.config.ConfigureAnacrolixDhtServer; f != nil {
438 s, err = dht.NewServer(&cfg)
440 go s.TableMaintainer()
445 func (cl *Client) Closed() events.Done {
446 return cl.closed.Done()
449 func (cl *Client) eachDhtServer(f func(DhtServer)) {
450 for _, ds := range cl.dhtServers {
455 // Stops the client. All connections to peers are closed and all activity will come to a halt.
456 func (cl *Client) Close() (errs []error) {
457 var closeGroup sync.WaitGroup // For concurrent cleanup to complete before returning
459 for t := range cl.torrents {
460 err := t.close(&closeGroup)
462 errs = append(errs, err)
465 for i := range cl.onClose {
466 cl.onClose[len(cl.onClose)-1-i]()
471 closeGroup.Wait() // defer is LIFO. We want to Wait() after cl.unlock()
475 func (cl *Client) ipBlockRange(ip net.IP) (r iplist.Range, blocked bool) {
476 if cl.ipBlockList == nil {
479 return cl.ipBlockList.Lookup(ip)
482 func (cl *Client) ipIsBlocked(ip net.IP) bool {
483 _, blocked := cl.ipBlockRange(ip)
487 func (cl *Client) wantConns() bool {
488 if cl.config.AlwaysWantConns {
491 for t := range cl.torrents {
492 if t.wantIncomingConns() {
499 // TODO: Apply filters for non-standard networks, particularly rate-limiting.
500 func (cl *Client) rejectAccepted(conn net.Conn) error {
502 return errors.New("don't want conns right now")
504 ra := conn.RemoteAddr()
505 if rip := addrIpOrNil(ra); rip != nil {
506 if cl.config.DisableIPv4Peers && rip.To4() != nil {
507 return errors.New("ipv4 peers disabled")
509 if cl.config.DisableIPv4 && len(rip) == net.IPv4len {
510 return errors.New("ipv4 disabled")
512 if cl.config.DisableIPv6 && len(rip) == net.IPv6len && rip.To4() == nil {
513 return errors.New("ipv6 disabled")
515 if cl.rateLimitAccept(rip) {
516 return errors.New("source IP accepted rate limited")
518 if cl.badPeerIPPort(rip, missinggo.AddrPort(ra)) {
519 return errors.New("bad source addr")
525 func (cl *Client) acceptConnections(l Listener) {
527 conn, err := l.Accept()
528 torrent.Add("client listener accepts", 1)
530 holepunchAddr, holepunchErr := addrPortFromPeerRemoteAddr(conn.RemoteAddr())
531 if holepunchErr == nil {
533 if g.MapContains(cl.undialableWithoutHolepunch, holepunchAddr) {
534 setAdd(&cl.accepted, holepunchAddr)
537 cl.undialableWithoutHolepunchDialedAfterHolepunchConnect,
540 setAdd(&cl.probablyOnlyConnectedDueToHolepunch, holepunchAddr)
545 conn = pproffd.WrapNetConn(conn)
547 closed := cl.closed.IsSet()
549 if !closed && conn != nil {
550 reject = cl.rejectAccepted(conn)
560 log.Fmsg("error accepting connection: %s", err).LogLevel(log.Debug, cl.logger)
565 torrent.Add("rejected accepted connections", 1)
566 cl.logger.LazyLog(log.Debug, func() log.Msg {
567 return log.Fmsg("rejecting accepted conn: %v", reject)
571 go cl.incomingConnection(conn)
573 cl.logger.LazyLog(log.Debug, func() log.Msg {
574 return log.Fmsg("accepted %q connection at %q from %q",
580 torrent.Add(fmt.Sprintf("accepted conn remote IP len=%d", len(addrIpOrNil(conn.RemoteAddr()))), 1)
581 torrent.Add(fmt.Sprintf("accepted conn network=%s", conn.RemoteAddr().Network()), 1)
582 torrent.Add(fmt.Sprintf("accepted on %s listener", l.Addr().Network()), 1)
587 // Creates the PeerConn.connString for a regular net.Conn PeerConn.
588 func regularNetConnPeerConnConnString(nc net.Conn) string {
589 return fmt.Sprintf("%s-%s", nc.LocalAddr(), nc.RemoteAddr())
592 func (cl *Client) incomingConnection(nc net.Conn) {
594 if tc, ok := nc.(*net.TCPConn); ok {
597 remoteAddr, _ := tryIpPortFromNetAddr(nc.RemoteAddr())
598 c := cl.newConnection(
602 remoteAddr: nc.RemoteAddr(),
603 localPublicAddr: cl.publicAddr(remoteAddr.IP),
604 network: nc.RemoteAddr().Network(),
605 connString: regularNetConnPeerConnConnString(nc),
607 c.Discovery = PeerSourceIncoming
608 cl.runReceivedConn(c)
615 // Returns a handle to the given torrent, if it's present in the client.
616 func (cl *Client) Torrent(ih metainfo.Hash) (t *Torrent, ok bool) {
619 t, ok = cl.torrentsByShortHash[ih]
623 type DialResult struct {
628 func countDialResult(err error) {
630 torrent.Add("successful dials", 1)
632 torrent.Add("unsuccessful dials", 1)
636 func reducedDialTimeout(minDialTimeout, max time.Duration, halfOpenLimit, pendingPeers int) (ret time.Duration) {
637 ret = max / time.Duration((pendingPeers+halfOpenLimit)/halfOpenLimit)
638 if ret < minDialTimeout {
644 // Returns whether an address is known to connect to a client with our own ID.
645 func (cl *Client) dopplegangerAddr(addr string) bool {
646 _, ok := cl.dopplegangerAddrs[addr]
650 // Returns a connection over UTP or TCP, whichever is first to connect.
651 func (cl *Client) dialFirst(ctx context.Context, addr string) (res DialResult) {
652 return DialFirst(ctx, addr, cl.dialers)
655 // Returns a connection over UTP or TCP, whichever is first to connect.
656 func DialFirst(ctx context.Context, addr string, dialers []Dialer) (res DialResult) {
660 defer pool.startDrainer()
661 for _, _s := range dialers {
664 return pool.getFirst()
667 func dialFromSocket(ctx context.Context, s Dialer, addr string) net.Conn {
668 c, err := s.Dial(ctx, addr)
670 log.ContextLogger(ctx).Levelf(log.Debug, "error dialing %q: %v", addr, err)
672 // This is a bit optimistic, but it looks non-trivial to thread this through the proxy code. Set
673 // it now in case we close the connection forthwith. Note this is also done in the TCP dialer
674 // code to increase the chance it's done.
675 if tc, ok := c.(*net.TCPConn); ok {
682 func (cl *Client) noLongerHalfOpen(t *Torrent, addr string, attemptKey outgoingConnAttemptKey) {
683 path := t.getHalfOpenPath(addr, attemptKey)
685 panic("should exist")
689 if cl.numHalfOpen < 0 {
690 panic("should not be possible")
692 for t := range cl.torrents {
697 func (cl *Client) countHalfOpenFromTorrents() (count int) {
698 for t := range cl.torrents {
699 count += t.numHalfOpenAttempts()
704 // Performs initiator handshakes and returns a connection. Returns nil *PeerConn if no connection
705 // for valid reasons.
706 func (cl *Client) initiateProtocolHandshakes(
711 newConnOpts newConnectionOpts,
713 c *PeerConn, err error,
715 c = cl.newConnection(nc, newConnOpts)
716 c.headerEncrypted = encryptHeader
717 ctx, cancel := context.WithTimeout(ctx, cl.config.HandshakesTimeout)
719 dl, ok := ctx.Deadline()
723 err = nc.SetDeadline(dl)
727 err = cl.initiateHandshakes(c, t)
731 func doProtocolHandshakeOnDialResult(
733 obfuscatedHeader bool,
737 c *PeerConn, err error,
741 addrIpPort, _ := tryIpPortFromNetAddr(addr)
742 c, err = cl.initiateProtocolHandshakes(
743 context.Background(), nc, t, obfuscatedHeader,
747 // It would be possible to retrieve a public IP from the dialer used here?
748 localPublicAddr: cl.publicAddr(addrIpPort.IP),
749 network: dr.Dialer.DialerNetwork(),
750 connString: regularNetConnPeerConnConnString(nc),
758 // Returns nil connection and nil error if no connection could be established for valid reasons.
759 func (cl *Client) dialAndCompleteHandshake(opts outgoingConnOpts) (c *PeerConn, err error) {
760 // It would be better if dial rate limiting could be tested when considering to open connections
761 // instead. Doing it here means if the limit is low, and the half-open limit is high, we could
762 // end up with lots of outgoing connection attempts pending that were initiated on stale data.
764 dialReservation := cl.config.DialRateLimiter.Reserve()
765 if !opts.receivedHolepunchConnect {
766 if !dialReservation.OK() {
767 err = errors.New("can't make dial limit reservation")
770 time.Sleep(dialReservation.Delay())
773 torrent.Add("establish outgoing connection", 1)
774 addr := opts.peerInfo.Addr
775 dialPool := dialPool{
776 resCh: make(chan DialResult),
779 defer dialPool.startDrainer()
780 dialTimeout := opts.t.getDialTimeoutUnlocked()
782 ctx, cancel := context.WithTimeout(context.Background(), dialTimeout)
784 for _, d := range cl.dialers {
788 holepunchAddr, holepunchAddrErr := addrPortFromPeerRemoteAddr(addr)
789 headerObfuscationPolicy := opts.HeaderObfuscationPolicy
790 obfuscatedHeaderFirst := headerObfuscationPolicy.Preferred
791 firstDialResult := dialPool.getFirst()
792 if firstDialResult.Conn == nil {
793 // No dialers worked. Try to initiate a holepunching rendezvous.
794 if holepunchAddrErr == nil {
796 if !opts.receivedHolepunchConnect {
797 g.MakeMapIfNilAndSet(&cl.undialableWithoutHolepunch, holepunchAddr, struct{}{})
799 if !opts.skipHolepunchRendezvous {
800 opts.t.trySendHolepunchRendezvous(holepunchAddr)
804 err = fmt.Errorf("all initial dials failed")
807 if opts.receivedHolepunchConnect && holepunchAddrErr == nil {
809 if g.MapContains(cl.undialableWithoutHolepunch, holepunchAddr) {
810 g.MakeMapIfNilAndSet(&cl.dialableOnlyAfterHolepunch, holepunchAddr, struct{}{})
812 g.MakeMapIfNil(&cl.dialedSuccessfullyAfterHolepunchConnect)
813 g.MapInsert(cl.dialedSuccessfullyAfterHolepunchConnect, holepunchAddr, struct{}{})
816 c, err = doProtocolHandshakeOnDialResult(
818 obfuscatedHeaderFirst,
823 torrent.Add("initiated conn with preferred header obfuscation", 1)
828 "error doing protocol handshake with header obfuscation %v",
829 obfuscatedHeaderFirst,
831 firstDialResult.Conn.Close()
832 // We should have just tried with the preferred header obfuscation. If it was required, there's nothing else to try.
833 if headerObfuscationPolicy.RequirePreferred {
836 // Reuse the dialer that returned already but failed to handshake.
838 ctx, cancel := context.WithTimeout(context.Background(), dialTimeout)
840 dialPool.add(ctx, firstDialResult.Dialer)
842 secondDialResult := dialPool.getFirst()
843 if secondDialResult.Conn == nil {
846 c, err = doProtocolHandshakeOnDialResult(
848 !obfuscatedHeaderFirst,
853 torrent.Add("initiated conn with fallback header obfuscation", 1)
858 "error doing protocol handshake with header obfuscation %v",
859 !obfuscatedHeaderFirst,
861 secondDialResult.Conn.Close()
865 type outgoingConnOpts struct {
868 // Don't attempt to connect unless a connect message is received after initiating a rendezvous.
869 requireRendezvous bool
870 // Don't send rendezvous requests to eligible relays.
871 skipHolepunchRendezvous bool
872 // Outgoing connection attempt is in response to holepunch connect message.
873 receivedHolepunchConnect bool
874 HeaderObfuscationPolicy HeaderObfuscationPolicy
877 // Called to dial out and run a connection. The addr we're given is already
878 // considered half-open.
879 func (cl *Client) outgoingConnection(
880 opts outgoingConnOpts,
881 attemptKey outgoingConnAttemptKey,
883 c, err := cl.dialAndCompleteHandshake(opts)
885 c.conn.SetWriteDeadline(time.Time{})
889 // Don't release lock between here and addPeerConn, unless it's for failure.
890 cl.noLongerHalfOpen(opts.t, opts.peerInfo.Addr.String(), attemptKey)
895 "error establishing outgoing connection to %v: %v",
903 c.Discovery = opts.peerInfo.Source
904 c.trusted = opts.peerInfo.Trusted
905 opts.t.runHandshookConnLoggingErr(c)
908 // The port number for incoming peer connections. 0 if the client isn't listening.
909 func (cl *Client) incomingPeerPort() int {
910 return cl.LocalPort()
913 func (cl *Client) initiateHandshakes(c *PeerConn, t *Torrent) (err error) {
914 if c.headerEncrypted {
916 rw, c.cryptoMethod, err = mse.InitiateHandshake(
921 t.canonicalShortInfohash().Bytes(),
923 cl.config.CryptoProvides,
927 return fmt.Errorf("header obfuscation handshake: %w", err)
930 localReservedBits := cl.config.Extensions
931 handshakeIh := *t.canonicalShortInfohash()
932 // If we're sending the v1 infohash, and we know the v2 infohash, set the v2 upgrade bit. This
933 // means the peer can send the v2 infohash in the handshake to upgrade the connection.
934 localReservedBits.SetBit(pp.ExtensionBitV2Upgrade, g.Some(handshakeIh) == t.infoHash && t.infoHashV2.Ok)
935 ih, err := cl.connBtHandshake(c, &handshakeIh, localReservedBits)
937 return fmt.Errorf("bittorrent protocol handshake: %w", err)
939 if g.Some(ih) == t.infoHash {
942 if t.infoHashV2.Ok && *t.infoHashV2.Value.ToShort() == ih {
943 torrent.Add("initiated handshakes upgraded to v2", 1)
947 err = errors.New("bittorrent protocol handshake: peer infohash didn't match")
951 // Calls f with any secret keys. Note that it takes the Client lock, and so must be used from code
952 // that won't also try to take the lock. This saves us copying all the infohashes everytime.
953 func (cl *Client) forSkeys(f func([]byte) bool) {
956 if false { // Emulate the bug from #114
958 for ih := range cl.torrentsByShortHash {
962 for range cl.torrentsByShortHash {
969 for ih := range cl.torrentsByShortHash {
976 func (cl *Client) handshakeReceiverSecretKeys() mse.SecretKeyIter {
977 if ret := cl.config.Callbacks.ReceiveEncryptedHandshakeSkeys; ret != nil {
983 // Do encryption and bittorrent handshakes as receiver.
984 func (cl *Client) receiveHandshakes(c *PeerConn) (t *Torrent, err error) {
985 defer perf.ScopeTimerErr(&err)()
987 rw, c.headerEncrypted, c.cryptoMethod, err = handleEncryption(
989 cl.handshakeReceiverSecretKeys(),
990 cl.config.HeaderObfuscationPolicy,
991 cl.config.CryptoSelector,
994 if err == nil || err == mse.ErrNoSecretKeyMatch {
995 if c.headerEncrypted {
996 torrent.Add("handshakes received encrypted", 1)
998 torrent.Add("handshakes received unencrypted", 1)
1001 torrent.Add("handshakes received with error while handling encryption", 1)
1004 if err == mse.ErrNoSecretKeyMatch {
1009 if cl.config.HeaderObfuscationPolicy.RequirePreferred && c.headerEncrypted != cl.config.HeaderObfuscationPolicy.Preferred {
1010 err = errors.New("connection does not have required header obfuscation")
1013 ih, err := cl.connBtHandshake(c, nil, cl.config.Extensions)
1015 return nil, fmt.Errorf("during bt handshake: %w", err)
1019 t = cl.torrentsByShortHash[ih]
1020 if t != nil && t.infoHashV2.Ok && *t.infoHashV2.Value.ToShort() == ih {
1021 torrent.Add("v2 handshakes received", 1)
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, reservedBits PeerExtensionBits) (ret metainfo.Hash, err error) {
1038 res, err := pp.Handshake(c.rw(), ih, cl.peerID, reservedBits)
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 (t *Torrent) runHandshookConn(pc *PeerConn) error {
1095 for i, b := range cl.config.MinPeerExtensions {
1096 if pc.PeerExtensionBytes[i]&b != b {
1097 return fmt.Errorf("peer did not meet minimum peer extensions: %x", pc.PeerExtensionBytes[:])
1100 if pc.PeerID == cl.peerID {
1103 addr := pc.RemoteAddr.String()
1104 cl.dopplegangerAddrs[addr] = struct{}{}
1106 // Because the remote address is not necessarily the same as its client's torrent listen
1107 // address, we won't record the remote address as a doppleganger. Instead, the initiator
1108 // can record *us* as the doppleganger.
1110 t.logger.Levelf(log.Debug, "local and remote peer ids are the same")
1113 pc.r = deadlineReader{pc.conn, pc.r}
1114 completedHandshakeConnectionFlags.Add(pc.connectionFlags(), 1)
1115 if connIsIpv6(pc.conn) {
1116 torrent.Add("completed handshake over ipv6", 1)
1118 if err := t.addPeerConn(pc); err != nil {
1119 return fmt.Errorf("adding connection: %w", err)
1121 defer t.dropConnection(pc)
1122 pc.addBuiltinLtepProtocols(!cl.config.DisablePEX)
1123 for _, cb := range pc.callbacks.PeerConnAdded {
1126 pc.startMessageWriter()
1127 pc.sendInitialMessages()
1128 pc.initUpdateRequestsTimer()
1129 err := pc.mainReadLoop()
1131 return fmt.Errorf("main read loop: %w", err)
1136 func (p *Peer) initUpdateRequestsTimer() {
1138 if p.updateRequestsTimer != nil {
1139 panic(p.updateRequestsTimer)
1142 if enableUpdateRequestsTimer {
1143 p.updateRequestsTimer = time.AfterFunc(math.MaxInt64, p.updateRequestsTimerFunc)
1147 const peerUpdateRequestsTimerReason = "updateRequestsTimer"
1149 func (c *Peer) updateRequestsTimerFunc() {
1151 defer c.locker().Unlock()
1152 if c.closed.IsSet() {
1155 if c.isLowOnRequests() {
1156 // If there are no outstanding requests, then a request update should have already run.
1159 if d := time.Since(c.lastRequestUpdate); d < updateRequestsTimerDuration {
1160 // These should be benign, Timer.Stop doesn't guarantee that its function won't run if it's
1161 // already been fired.
1162 torrent.Add("spurious timer requests updates", 1)
1165 c.updateRequests(peerUpdateRequestsTimerReason)
1168 // Maximum pending requests we allow peers to send us. If peer requests are buffered on read, this
1169 // instructs the amount of memory that might be used to cache pending writes. Assuming 512KiB
1170 // (1<<19) cached for sending, for 16KiB (1<<14) chunks.
1171 const localClientReqq = 1024
1173 // See the order given in Transmission's tr_peerMsgsNew.
1174 func (pc *PeerConn) sendInitialMessages() {
1177 if pc.PeerExtensionBytes.SupportsExtended() && cl.config.Extensions.SupportsExtended() {
1178 pc.write(pp.Message{
1180 ExtendedID: pp.HandshakeExtendedID,
1181 ExtendedPayload: func() []byte {
1182 msg := pp.ExtendedHandshakeMessage{
1183 V: cl.config.ExtendedHandshakeClientVersion,
1184 Reqq: localClientReqq,
1185 YourIp: pp.CompactIp(pc.remoteIp()),
1186 Encryption: cl.config.HeaderObfuscationPolicy.Preferred || !cl.config.HeaderObfuscationPolicy.RequirePreferred,
1187 Port: cl.incomingPeerPort(),
1188 MetadataSize: t.metadataSize(),
1189 // TODO: We can figure these out specific to the socket used.
1190 Ipv4: pp.CompactIp(cl.config.PublicIp4.To4()),
1191 Ipv6: cl.config.PublicIp6.To16(),
1193 msg.M = pc.LocalLtepProtocolMap.toSupportedExtensionDict()
1194 return bencode.MustMarshal(msg)
1199 if pc.fastEnabled() {
1200 if t.haveAllPieces() {
1201 pc.write(pp.Message{Type: pp.HaveAll})
1202 pc.sentHaves.AddRange(0, bitmap.BitRange(pc.t.NumPieces()))
1204 } else if !t.haveAnyPieces() {
1205 pc.write(pp.Message{Type: pp.HaveNone})
1206 pc.sentHaves.Clear()
1212 if pc.PeerExtensionBytes.SupportsDHT() && cl.config.Extensions.SupportsDHT() && cl.haveDhtServer() {
1213 pc.write(pp.Message{
1220 func (cl *Client) dhtPort() (ret uint16) {
1221 if len(cl.dhtServers) == 0 {
1224 return uint16(missinggo.AddrPort(cl.dhtServers[len(cl.dhtServers)-1].Addr()))
1227 func (cl *Client) haveDhtServer() bool {
1228 return len(cl.dhtServers) > 0
1231 // Process incoming ut_metadata message.
1232 func (cl *Client) gotMetadataExtensionMsg(payload []byte, t *Torrent, c *PeerConn) error {
1233 var d pp.ExtendedMetadataRequestMsg
1234 err := bencode.Unmarshal(payload, &d)
1235 if _, ok := err.(bencode.ErrUnusedTrailingBytes); ok {
1236 } else if err != nil {
1237 return fmt.Errorf("error unmarshalling bencode: %s", err)
1241 case pp.DataMetadataExtensionMsgType:
1242 c.allStats(add(1, func(cs *ConnStats) *Count { return &cs.MetadataChunksRead }))
1243 if !c.requestedMetadataPiece(piece) {
1244 return fmt.Errorf("got unexpected piece %d", piece)
1246 c.metadataRequests[piece] = false
1247 begin := len(payload) - d.PieceSize()
1248 if begin < 0 || begin >= len(payload) {
1249 return fmt.Errorf("data has bad offset in payload: %d", begin)
1251 t.saveMetadataPiece(piece, payload[begin:])
1252 c.lastUsefulChunkReceived = time.Now()
1253 err = t.maybeCompleteMetadata()
1255 // Log this at the Torrent-level, as we don't partition metadata by Peer yet, so we
1256 // don't know who to blame. TODO: Also errors can be returned here that aren't related
1257 // to verifying metadata, which should be fixed. This should be tagged with metadata, so
1258 // log consumers can filter for this message.
1259 t.logger.WithDefaultLevel(log.Warning).Printf("error completing metadata: %v", err)
1262 case pp.RequestMetadataExtensionMsgType:
1263 if !t.haveMetadataPiece(piece) {
1264 c.write(t.newMetadataExtensionMessage(c, pp.RejectMetadataExtensionMsgType, d.Piece, nil))
1267 start := (1 << 14) * piece
1268 c.protocolLogger.WithDefaultLevel(log.Debug).Printf("sending metadata piece %d", piece)
1269 c.write(t.newMetadataExtensionMessage(c, pp.DataMetadataExtensionMsgType, piece, t.metadataBytes[start:start+t.metadataPieceSize(piece)]))
1271 case pp.RejectMetadataExtensionMsgType:
1274 return errors.New("unknown msg_type value")
1278 func (cl *Client) badPeerAddr(addr PeerRemoteAddr) bool {
1279 if ipa, ok := tryIpPortFromNetAddr(addr); ok {
1280 return cl.badPeerIPPort(ipa.IP, ipa.Port)
1285 // Returns whether the IP address and port are considered "bad".
1286 func (cl *Client) badPeerIPPort(ip net.IP, port int) bool {
1287 if port == 0 || ip == nil {
1290 if cl.dopplegangerAddr(net.JoinHostPort(ip.String(), strconv.FormatInt(int64(port), 10))) {
1293 if _, ok := cl.ipBlockRange(ip); ok {
1296 ipAddr, ok := netip.AddrFromSlice(ip)
1300 if _, ok := cl.badPeerIPs[ipAddr]; ok {
1306 // Return a Torrent ready for insertion into a Client.
1307 func (cl *Client) newTorrent(ih metainfo.Hash, specStorage storage.ClientImpl) (t *Torrent) {
1308 return cl.newTorrentOpt(AddTorrentOpts{
1310 Storage: specStorage,
1314 // Return a Torrent ready for insertion into a Client.
1315 func (cl *Client) newTorrentOpt(opts AddTorrentOpts) (t *Torrent) {
1316 var v1InfoHash g.Option[infohash.T]
1317 if !opts.InfoHash.IsZero() {
1318 v1InfoHash.Set(opts.InfoHash)
1320 if !v1InfoHash.Ok && !opts.InfoHashV2.Ok {
1321 panic("v1 infohash must be nonzero or v2 infohash must be set")
1323 // use provided storage, if provided
1324 storageClient := cl.defaultStorage
1325 if opts.Storage != nil {
1326 storageClient = storage.NewClient(opts.Storage)
1331 infoHash: v1InfoHash,
1332 infoHashV2: opts.InfoHashV2,
1333 peers: prioritizedPeers{
1335 getPrio: func(p PeerInfo) peerPriority {
1337 return bep40PriorityIgnoreError(cl.publicAddr(ipPort.IP), ipPort)
1340 conns: make(map[*PeerConn]struct{}, 2*cl.config.EstablishedConnsPerTorrent),
1342 storageOpener: storageClient,
1343 maxEstablishedConns: cl.config.EstablishedConnsPerTorrent,
1345 metadataChanged: sync.Cond{
1348 webSeeds: make(map[string]*Peer),
1349 gotMetainfoC: make(chan struct{}),
1353 t.smartBanCache.Hash = func(b []byte) uint64 {
1359 t.smartBanCache.Init()
1360 t.networkingEnabled.Set()
1361 t.logger = cl.logger.WithDefaultLevel(log.Debug)
1362 t.sourcesLogger = t.logger.WithNames("sources")
1363 if opts.ChunkSize == 0 {
1364 opts.ChunkSize = defaultChunkSize
1366 t.setChunkSize(opts.ChunkSize)
1370 // A file-like handle to some torrent data resource.
1371 type Handle interface {
1378 func (cl *Client) AddTorrentInfoHash(infoHash metainfo.Hash) (t *Torrent, new bool) {
1379 return cl.AddTorrentInfoHashWithStorage(infoHash, nil)
1382 // Deprecated. Adds a torrent by InfoHash with a custom Storage implementation.
1383 // If the torrent already exists then this Storage is ignored and the
1384 // existing torrent returned with `new` set to `false`
1385 func (cl *Client) AddTorrentInfoHashWithStorage(
1386 infoHash metainfo.Hash,
1387 specStorage storage.ClientImpl,
1388 ) (t *Torrent, new bool) {
1391 t, ok := cl.torrentsByShortHash[infoHash]
1397 t = cl.newTorrent(infoHash, specStorage)
1398 cl.eachDhtServer(func(s DhtServer) {
1399 if cl.config.PeriodicallyAnnounceTorrentsToDht {
1400 go t.dhtAnnouncer(s)
1403 cl.torrentsByShortHash[infoHash] = t
1404 cl.torrents[t] = struct{}{}
1405 cl.clearAcceptLimits()
1406 t.updateWantPeersEvent()
1407 // Tickle Client.waitAccept, new torrent may want conns.
1408 cl.event.Broadcast()
1412 // Adds a torrent by InfoHash with a custom Storage implementation. If the torrent already exists
1413 // then this Storage is ignored and the existing torrent returned with `new` set to `false`.
1414 func (cl *Client) AddTorrentOpt(opts AddTorrentOpts) (t *Torrent, new bool) {
1415 infoHash := opts.InfoHash
1418 t, ok := cl.torrentsByShortHash[infoHash]
1422 if opts.InfoHashV2.Ok {
1423 t, ok = cl.torrentsByShortHash[*opts.InfoHashV2.Value.ToShort()]
1430 t = cl.newTorrentOpt(opts)
1431 cl.eachDhtServer(func(s DhtServer) {
1432 if cl.config.PeriodicallyAnnounceTorrentsToDht {
1433 go t.dhtAnnouncer(s)
1436 cl.torrentsByShortHash[infoHash] = t
1437 cl.torrents[t] = struct{}{}
1438 t.setInfoBytesLocked(opts.InfoBytes)
1439 cl.clearAcceptLimits()
1440 t.updateWantPeersEvent()
1441 // Tickle Client.waitAccept, new torrent may want conns.
1442 cl.event.Broadcast()
1446 type AddTorrentOpts struct {
1448 InfoHashV2 g.Option[infohash_v2.T]
1449 Storage storage.ClientImpl
1450 ChunkSize pp.Integer
1454 // Add or merge a torrent spec. Returns new if the torrent wasn't already in the client. See also
1455 // Torrent.MergeSpec.
1456 func (cl *Client) AddTorrentSpec(spec *TorrentSpec) (t *Torrent, new bool, err error) {
1457 t, new = cl.AddTorrentOpt(AddTorrentOpts{
1458 InfoHash: spec.InfoHash,
1459 InfoHashV2: spec.InfoHashV2,
1460 Storage: spec.Storage,
1461 ChunkSize: spec.ChunkSize,
1465 // ChunkSize was already applied by adding a new Torrent, and MergeSpec disallows changing
1467 modSpec.ChunkSize = 0
1469 err = t.MergeSpec(&modSpec)
1470 if err != nil && new {
1476 // The trackers will be merged with the existing ones. If the Info isn't yet known, it will be set.
1477 // spec.DisallowDataDownload/Upload will be read and applied
1478 // The display name is replaced if the new spec provides one. Note that any `Storage` is ignored.
1479 func (t *Torrent) MergeSpec(spec *TorrentSpec) error {
1480 if spec.DisplayName != "" {
1481 t.SetDisplayName(spec.DisplayName)
1483 if spec.InfoBytes != nil {
1484 err := t.SetInfoBytes(spec.InfoBytes)
1490 cl.AddDhtNodes(spec.DhtNodes)
1491 t.UseSources(spec.Sources)
1494 t.initialPieceCheckDisabled = spec.DisableInitialPieceCheck
1495 for _, url := range spec.Webseeds {
1498 for _, peerAddr := range spec.PeerAddrs {
1500 Addr: StringAddr(peerAddr),
1501 Source: PeerSourceDirect,
1505 if spec.ChunkSize != 0 {
1506 panic("chunk size cannot be changed for existing Torrent")
1508 t.addTrackers(spec.Trackers)
1510 t.dataDownloadDisallowed.SetBool(spec.DisallowDataDownload)
1511 t.dataUploadDisallowed = spec.DisallowDataUpload
1512 return errors.Join(t.addPieceLayersLocked(spec.PieceLayers)...)
1515 func (cl *Client) dropTorrent(t *Torrent, wg *sync.WaitGroup) (err error) {
1516 t.eachShortInfohash(func(short [20]byte) {
1517 delete(cl.torrentsByShortHash, short)
1520 delete(cl.torrents, t)
1524 func (cl *Client) allTorrentsCompleted() bool {
1525 for t := range cl.torrents {
1529 if !t.haveAllPieces() {
1536 // Returns true when all torrents are completely downloaded and false if the
1537 // client is stopped before that.
1538 func (cl *Client) WaitAll() bool {
1541 for !cl.allTorrentsCompleted() {
1542 if cl.closed.IsSet() {
1550 // Returns handles to all the torrents loaded in the Client.
1551 func (cl *Client) Torrents() []*Torrent {
1554 return cl.torrentsAsSlice()
1557 func (cl *Client) torrentsAsSlice() (ret []*Torrent) {
1558 for t := range cl.torrents {
1559 ret = append(ret, t)
1564 func (cl *Client) AddMagnet(uri string) (T *Torrent, err error) {
1565 spec, err := TorrentSpecFromMagnetUri(uri)
1569 T, _, err = cl.AddTorrentSpec(spec)
1573 func (cl *Client) AddTorrent(mi *metainfo.MetaInfo) (T *Torrent, err error) {
1574 ts, err := TorrentSpecFromMetaInfoErr(mi)
1578 T, _, err = cl.AddTorrentSpec(ts)
1582 func (cl *Client) AddTorrentFromFile(filename string) (T *Torrent, err error) {
1583 mi, err := metainfo.LoadFromFile(filename)
1587 return cl.AddTorrent(mi)
1590 func (cl *Client) DhtServers() []DhtServer {
1591 return cl.dhtServers
1594 func (cl *Client) AddDhtNodes(nodes []string) {
1595 for _, n := range nodes {
1596 hmp := missinggo.SplitHostMaybePort(n)
1597 ip := net.ParseIP(hmp.Host)
1599 cl.logger.Printf("won't add DHT node with bad IP: %q", hmp.Host)
1602 ni := krpc.NodeInfo{
1603 Addr: krpc.NodeAddr{
1608 cl.eachDhtServer(func(s DhtServer) {
1614 func (cl *Client) banPeerIP(ip net.IP) {
1615 // We can't take this from string, because it will lose netip's v4on6. net.ParseIP parses v4
1616 // addresses directly to v4on6, which doesn't compare equal with v4.
1617 ipAddr, ok := netip.AddrFromSlice(ip)
1621 g.MakeMapIfNilAndSet(&cl.badPeerIPs, ipAddr, struct{}{})
1622 for t := range cl.torrents {
1623 t.iterPeers(func(p *Peer) {
1624 if p.remoteIp().Equal(ip) {
1625 t.logger.Levelf(log.Warning, "dropping peer %v with banned ip %v", p, ip)
1626 // Should this be a close?
1633 type newConnectionOpts struct {
1635 remoteAddr PeerRemoteAddr
1636 localPublicAddr peerLocalPublicAddr
1641 func (cl *Client) newConnection(nc net.Conn, opts newConnectionOpts) (c *PeerConn) {
1642 if opts.network == "" {
1643 panic(opts.remoteAddr)
1647 outgoing: opts.outgoing,
1650 PeerMaxRequests: 250,
1652 RemoteAddr: opts.remoteAddr,
1653 localPublicAddr: opts.localPublicAddr,
1654 Network: opts.network,
1655 callbacks: &cl.config.Callbacks,
1657 connString: opts.connString,
1660 c.peerRequestDataAllocLimiter.Max = cl.config.MaxAllocPeerRequestDataPerConn
1661 c.initRequestState()
1662 // TODO: Need to be much more explicit about this, including allowing non-IP bannable addresses.
1663 if opts.remoteAddr != nil {
1664 netipAddrPort, err := netip.ParseAddrPort(opts.remoteAddr.String())
1666 c.bannableAddr = Some(netipAddrPort.Addr())
1670 c.logger = cl.logger.WithDefaultLevel(log.Warning).WithContextText(fmt.Sprintf("%T %p", c, c))
1671 c.protocolLogger = c.logger.WithNames(protocolLoggingName)
1672 c.setRW(connStatsReadWriter{nc, c})
1673 c.r = &rateLimitedReader{
1674 l: cl.config.DownloadRateLimiter,
1679 "inited with remoteAddr %v network %v outgoing %t",
1680 opts.remoteAddr, opts.network, opts.outgoing,
1682 for _, f := range cl.config.Callbacks.NewPeer {
1688 func (cl *Client) onDHTAnnouncePeer(ih metainfo.Hash, ip net.IP, port int, portOk bool) {
1691 t := cl.torrentsByShortHash[ih]
1695 t.addPeers([]PeerInfo{{
1696 Addr: ipPortAddr{ip, port},
1697 Source: PeerSourceDhtAnnouncePeer,
1701 func firstNotNil(ips ...net.IP) net.IP {
1702 for _, ip := range ips {
1710 func (cl *Client) eachListener(f func(Listener) bool) {
1711 for _, s := range cl.listeners {
1718 func (cl *Client) findListener(f func(Listener) bool) (ret Listener) {
1719 for i := 0; i < len(cl.listeners); i += 1 {
1720 if ret = cl.listeners[i]; f(ret) {
1727 func (cl *Client) publicIp(peer net.IP) net.IP {
1728 // TODO: Use BEP 10 to determine how peers are seeing us.
1729 if peer.To4() != nil {
1731 cl.config.PublicIp4,
1732 cl.findListenerIp(func(ip net.IP) bool { return ip.To4() != nil }),
1737 cl.config.PublicIp6,
1738 cl.findListenerIp(func(ip net.IP) bool { return ip.To4() == nil }),
1742 func (cl *Client) findListenerIp(f func(net.IP) bool) net.IP {
1743 l := cl.findListener(
1744 func(l Listener) bool {
1745 return f(addrIpOrNil(l.Addr()))
1751 return addrIpOrNil(l.Addr())
1754 // Our IP as a peer should see it.
1755 func (cl *Client) publicAddr(peer net.IP) IpPort {
1756 return IpPort{IP: cl.publicIp(peer), Port: uint16(cl.incomingPeerPort())}
1759 // ListenAddrs addresses currently being listened to.
1760 func (cl *Client) ListenAddrs() (ret []net.Addr) {
1762 ret = make([]net.Addr, len(cl.listeners))
1763 for i := 0; i < len(cl.listeners); i += 1 {
1764 ret[i] = cl.listeners[i].Addr()
1770 func (cl *Client) PublicIPs() (ips []net.IP) {
1771 if ip := cl.config.PublicIp4; ip != nil {
1772 ips = append(ips, ip)
1774 if ip := cl.config.PublicIp6; ip != nil {
1775 ips = append(ips, ip)
1780 func (cl *Client) onBadAccept(addr PeerRemoteAddr) {
1781 ipa, ok := tryIpPortFromNetAddr(addr)
1785 ip := maskIpForAcceptLimiting(ipa.IP)
1786 if cl.acceptLimiter == nil {
1787 cl.acceptLimiter = make(map[ipStr]int)
1789 cl.acceptLimiter[ipStr(ip.String())]++
1792 func maskIpForAcceptLimiting(ip net.IP) net.IP {
1793 if ip4 := ip.To4(); ip4 != nil {
1794 return ip4.Mask(net.CIDRMask(24, 32))
1799 func (cl *Client) clearAcceptLimits() {
1800 cl.acceptLimiter = nil
1803 func (cl *Client) acceptLimitClearer() {
1806 case <-cl.closed.Done():
1808 case <-time.After(15 * time.Minute):
1810 cl.clearAcceptLimits()
1816 func (cl *Client) rateLimitAccept(ip net.IP) bool {
1817 if cl.config.DisableAcceptRateLimiting {
1820 return cl.acceptLimiter[ipStr(maskIpForAcceptLimiting(ip).String())] > 0
1823 func (cl *Client) rLock() {
1827 func (cl *Client) rUnlock() {
1831 func (cl *Client) lock() {
1835 func (cl *Client) unlock() {
1839 func (cl *Client) locker() *lockWithDeferreds {
1843 func (cl *Client) String() string {
1844 return fmt.Sprintf("<%[1]T %[1]p>", cl)
1847 func (cl *Client) ICEServers() []webrtc.ICEServer {
1848 var ICEServers []webrtc.ICEServer
1849 if cl.config.ICEServerList != nil {
1850 ICEServers = cl.config.ICEServerList
1851 } else if cl.config.ICEServers != nil {
1852 ICEServers = []webrtc.ICEServer{{URLs: cl.config.ICEServers}}
1857 // Returns connection-level aggregate connStats at the Client level. See the comment on
1858 // TorrentStats.ConnStats.
1859 func (cl *Client) ConnStats() ConnStats {
1860 return cl.connStats.Copy()
1863 func (cl *Client) Stats() ClientStats {
1866 return cl.statsLocked()