9 "github.com/anacrolix/dht/v2"
10 "github.com/anacrolix/dht/v2/krpc"
11 "github.com/anacrolix/log"
12 "github.com/anacrolix/missinggo"
13 "github.com/anacrolix/missinggo/expect"
14 "github.com/anacrolix/missinggo/v2/conntrack"
15 "golang.org/x/time/rate"
17 "github.com/anacrolix/torrent/iplist"
18 "github.com/anacrolix/torrent/mse"
19 "github.com/anacrolix/torrent/storage"
22 // Probably not safe to modify this after it's given to a Client.
23 type ClientConfig struct {
24 // Store torrent file data in this directory unless .DefaultStorage is
26 DataDir string `long:"data-dir" description:"directory to store downloaded torrent data"`
27 // The address to listen for new uTP and TCP BitTorrent protocol connections. DHT shares a UDP
28 // socket with uTP unless configured otherwise.
29 ListenHost func(network string) string
31 NoDefaultPortForwarding bool
33 // Don't announce to trackers. This only leaves DHT to discover peers.
34 DisableTrackers bool `long:"disable-trackers"`
35 DisablePEX bool `long:"disable-pex"`
37 // Don't create a DHT.
38 NoDHT bool `long:"disable-dht"`
39 DhtStartingNodes func(network string) dht.StartingNodesGetter
40 // Never send chunks to peers.
41 NoUpload bool `long:"no-upload"`
42 // Disable uploading even when it isn't fair.
43 DisableAggressiveUpload bool `long:"disable-aggressive-upload"`
44 // Upload even after there's nothing in it for us. By default uploading is
45 // not altruistic, we'll only upload to encourage the peer to reciprocate.
46 Seed bool `long:"seed"`
47 // Only applies to chunks uploaded to peers, to maintain responsiveness
48 // communicating local Client state to peers. Each limiter token
49 // represents one byte. The Limiter's burst must be large enough to fit a
50 // whole chunk, which is usually 16 KiB (see TorrentSpec.ChunkSize).
51 UploadRateLimiter *rate.Limiter
52 // Rate limits all reads from connections to peers. Each limiter token
53 // represents one byte. The Limiter's burst must be bigger than the
54 // largest Read performed on a the underlying rate-limiting io.Reader
55 // minus one. This is likely to be the larger of the main read loop buffer
56 // (~4096), and the requested chunk size (~16KiB, see
57 // TorrentSpec.ChunkSize).
58 DownloadRateLimiter *rate.Limiter
60 // User-provided Client peer ID. If not present, one is generated automatically.
62 // For the bittorrent protocol.
64 // For the bittorrent protocol.
65 DisableTCP bool `long:"disable-tcp"`
66 // Called to instantiate storage for each added torrent. Builtin backends
67 // are in the storage package. If not set, the "file" implementation is
68 // used (and Closed when the Client is Closed).
69 DefaultStorage storage.ClientImpl
71 HeaderObfuscationPolicy HeaderObfuscationPolicy
72 // The crypto methods to offer when initiating connections with header obfuscation.
73 CryptoProvides mse.CryptoMethod
74 // Chooses the crypto method to use when receiving connections with header obfuscation.
75 CryptoSelector mse.CryptoSelector
77 IPBlocklist iplist.Ranger
78 DisableIPv6 bool `long:"disable-ipv6"`
81 // Perform logging and any other behaviour that will help debug.
82 Debug bool `help:"enable debugging"`
85 // Defines proxy for HTTP requests, such as for trackers. It's commonly set from the result of
86 // "net/http".ProxyURL(HTTPProxy).
87 HTTPProxy func(*http.Request) (*url.URL, error)
88 // HTTPUserAgent changes default UserAgent for HTTP requests
90 // Updated occasionally to when there's been some changes to client
91 // behaviour in case other clients are assuming anything of us. See also
93 ExtendedHandshakeClientVersion string
94 // Peer ID client identifier prefix. We'll update this occasionally to
95 // reflect changes to client behaviour that other clients may depend on.
96 // Also see `extendedHandshakeClientVersion`.
99 // Peer dial timeout to use when there are limited peers.
100 NominalDialTimeout time.Duration
101 // Minimum peer dial timeout to use (even if we have lots of peers).
102 MinDialTimeout time.Duration
103 EstablishedConnsPerTorrent int
104 HalfOpenConnsPerTorrent int
105 // Maximum number of peer addresses in reserve.
106 TorrentPeersHighWater int
107 // Minumum number of peers before effort is made to obtain more peers.
108 TorrentPeersLowWater int
110 // Limit how long handshake can take. This is to reduce the lingering
111 // impact of a few bad apples. 4s loses 1% of successful handshakes that
112 // are obtained with 60s timeout, and 5% of unsuccessful handshakes.
113 HandshakesTimeout time.Duration
115 // The IP addresses as our peers should see them. May differ from the
116 // local interfaces due to NAT or other network configurations.
120 DisableAcceptRateLimiting bool
121 // Don't add connections that have the same peer ID as an existing
122 // connection for a given Torrent.
123 DropDuplicatePeerIds bool
125 ConnTracker *conntrack.Instance
128 DHTOnQuery func(query *krpc.Msg, source net.Addr) (propagate bool)
130 DefaultRequestStrategy RequestStrategyMaker
132 Extensions PeerExtensionBits
135 func (cfg *ClientConfig) SetListenAddr(addr string) *ClientConfig {
136 host, port, err := missinggo.ParseHostPort(addr)
138 cfg.ListenHost = func(string) string { return host }
139 cfg.ListenPort = port
143 func NewDefaultClientConfig() *ClientConfig {
145 HTTPUserAgent: "Go-Torrent/1.0",
146 ExtendedHandshakeClientVersion: "go.torrent dev 20181121",
148 UpnpID: "anacrolix/torrent",
149 NominalDialTimeout: 20 * time.Second,
150 MinDialTimeout: 3 * time.Second,
151 EstablishedConnsPerTorrent: 50,
152 HalfOpenConnsPerTorrent: 25,
153 TorrentPeersHighWater: 500,
154 TorrentPeersLowWater: 50,
155 HandshakesTimeout: 4 * time.Second,
156 DhtStartingNodes: func(network string) dht.StartingNodesGetter {
157 return func() ([]dht.Addr, error) { return dht.GlobalBootstrapAddrs(network) }
159 ListenHost: func(string) string { return "" },
160 UploadRateLimiter: unlimited,
161 DownloadRateLimiter: unlimited,
162 ConnTracker: conntrack.NewInstance(),
163 DisableAcceptRateLimiting: true,
164 HeaderObfuscationPolicy: HeaderObfuscationPolicy{
166 RequirePreferred: false,
168 CryptoSelector: mse.DefaultCryptoSelector,
169 CryptoProvides: mse.AllSupportedCrypto,
173 DefaultRequestStrategy: RequestStrategyDuplicateRequestTimeout(5 * time.Second),
175 Extensions: defaultPeerExtensionBytes(),
177 //cc.ConnTracker.SetNoMaxEntries()
178 //cc.ConnTracker.Timeout = func(conntrack.Entry) time.Duration { return 0 }
182 type HeaderObfuscationPolicy struct {
183 RequirePreferred bool // Whether the value of Preferred is a strict requirement.
184 Preferred bool // Whether header obfuscation is preferred.