package torrent import ( "net" "net/http" "net/url" "time" "github.com/anacrolix/dht/v2" "github.com/anacrolix/dht/v2/krpc" "github.com/anacrolix/log" "github.com/anacrolix/missinggo/v2" "github.com/anacrolix/torrent/version" "golang.org/x/time/rate" "github.com/anacrolix/torrent/iplist" "github.com/anacrolix/torrent/mse" "github.com/anacrolix/torrent/storage" ) // Probably not safe to modify this after it's given to a Client. type ClientConfig struct { // Store torrent file data in this directory unless .DefaultStorage is // specified. DataDir string `long:"data-dir" description:"directory to store downloaded torrent data"` // The address to listen for new uTP and TCP BitTorrent protocol connections. DHT shares a UDP // socket with uTP unless configured otherwise. ListenHost func(network string) string ListenPort int NoDefaultPortForwarding bool UpnpID string // Don't announce to trackers. This only leaves DHT to discover peers. DisableTrackers bool `long:"disable-trackers"` DisablePEX bool `long:"disable-pex"` // Don't create a DHT. NoDHT bool `long:"disable-dht"` DhtStartingNodes func(network string) dht.StartingNodesGetter // Called for each anacrolix/dht Server created for the Client. ConfigureAnacrolixDhtServer func(*dht.ServerConfig) PeriodicallyAnnounceTorrentsToDht bool // Never send chunks to peers. NoUpload bool `long:"no-upload"` // Disable uploading even when it isn't fair. DisableAggressiveUpload bool `long:"disable-aggressive-upload"` // Upload even after there's nothing in it for us. By default uploading is // not altruistic, we'll only upload to encourage the peer to reciprocate. Seed bool `long:"seed"` // Only applies to chunks uploaded to peers, to maintain responsiveness // communicating local Client state to peers. Each limiter token // represents one byte. The Limiter's burst must be large enough to fit a // whole chunk, which is usually 16 KiB (see TorrentSpec.ChunkSize). UploadRateLimiter *rate.Limiter // Rate limits all reads from connections to peers. Each limiter token // represents one byte. The Limiter's burst must be bigger than the // largest Read performed on a the underlying rate-limiting io.Reader // minus one. This is likely to be the larger of the main read loop buffer // (~4096), and the requested chunk size (~16KiB, see // TorrentSpec.ChunkSize). DownloadRateLimiter *rate.Limiter // Maximum unverified bytes across all torrents. Not used if zero. MaxUnverifiedBytes int64 // User-provided Client peer ID. If not present, one is generated automatically. PeerID string // For the bittorrent protocol. DisableUTP bool // For the bittorrent protocol. DisableTCP bool `long:"disable-tcp"` // Called to instantiate storage for each added torrent. Builtin backends // are in the storage package. If not set, the "file" implementation is // used (and Closed when the Client is Closed). DefaultStorage storage.ClientImpl HeaderObfuscationPolicy HeaderObfuscationPolicy // The crypto methods to offer when initiating connections with header obfuscation. CryptoProvides mse.CryptoMethod // Chooses the crypto method to use when receiving connections with header obfuscation. CryptoSelector mse.CryptoSelector IPBlocklist iplist.Ranger DisableIPv6 bool `long:"disable-ipv6"` DisableIPv4 bool DisableIPv4Peers bool // Perform logging and any other behaviour that will help debug. Debug bool `help:"enable debugging"` Logger log.Logger // Defines proxy for HTTP requests, such as for trackers. It's commonly set from the result of // "net/http".ProxyURL(HTTPProxy). HTTPProxy func(*http.Request) (*url.URL, error) // Takes a tracker's hostname and requests DNS A and AAAA records. // Used in case DNS lookups require a special setup (i.e., dns-over-https) LookupTrackerIp func(*url.URL) ([]net.IP, error) // HTTPUserAgent changes default UserAgent for HTTP requests HTTPUserAgent string // Updated occasionally to when there's been some changes to client // behaviour in case other clients are assuming anything of us. See also // `bep20`. ExtendedHandshakeClientVersion string // Peer ID client identifier prefix. We'll update this occasionally to // reflect changes to client behaviour that other clients may depend on. // Also see `extendedHandshakeClientVersion`. Bep20 string // Peer dial timeout to use when there are limited peers. NominalDialTimeout time.Duration // Minimum peer dial timeout to use (even if we have lots of peers). MinDialTimeout time.Duration EstablishedConnsPerTorrent int HalfOpenConnsPerTorrent int TotalHalfOpenConns int // Maximum number of peer addresses in reserve. TorrentPeersHighWater int // Minumum number of peers before effort is made to obtain more peers. TorrentPeersLowWater int // Limit how long handshake can take. This is to reduce the lingering // impact of a few bad apples. 4s loses 1% of successful handshakes that // are obtained with 60s timeout, and 5% of unsuccessful handshakes. HandshakesTimeout time.Duration // How long between writes before sending a keep alive message on a peer connection that we want // to maintain. KeepAliveTimeout time.Duration // The IP addresses as our peers should see them. May differ from the // local interfaces due to NAT or other network configurations. PublicIp4 net.IP PublicIp6 net.IP // Accept rate limiting affects excessive connection attempts from IPs that fail during // handshakes or request torrents that we don't have. DisableAcceptRateLimiting bool // Don't add connections that have the same peer ID as an existing // connection for a given Torrent. DropDuplicatePeerIds bool // Drop peers that are complete if we are also complete and have no use for the peer. This is a // bit of a special case, since a peer could also be useless if they're just not interested, or // we don't intend to obtain all of a torrent's data. DropMutuallyCompletePeers bool // Whether to accept peer connections at all. AcceptPeerConnections bool // Whether a Client should want conns without delegating to any attached Torrents. This is // useful when torrents might be added dynmically in callbacks for example. AlwaysWantConns bool // OnQuery hook func DHTOnQuery func(query *krpc.Msg, source net.Addr) (propagate bool) Extensions PeerExtensionBits // Bits that peers must have set to proceed past handshakes. MinPeerExtensions PeerExtensionBits DisableWebtorrent bool DisableWebseeds bool Callbacks Callbacks } func (cfg *ClientConfig) SetListenAddr(addr string) *ClientConfig { host, port, err := missinggo.ParseHostPort(addr) if err != nil { panic(err) } cfg.ListenHost = func(string) string { return host } cfg.ListenPort = port return cfg } func NewDefaultClientConfig() *ClientConfig { cc := &ClientConfig{ HTTPUserAgent: version.DefaultHttpUserAgent, ExtendedHandshakeClientVersion: version.DefaultExtendedHandshakeClientVersion, Bep20: version.DefaultBep20Prefix, UpnpID: version.DefaultUpnpId, NominalDialTimeout: 20 * time.Second, MinDialTimeout: 3 * time.Second, EstablishedConnsPerTorrent: 50, HalfOpenConnsPerTorrent: 25, TotalHalfOpenConns: 100, TorrentPeersHighWater: 500, TorrentPeersLowWater: 50, HandshakesTimeout: 4 * time.Second, KeepAliveTimeout: time.Minute, DhtStartingNodes: func(network string) dht.StartingNodesGetter { return func() ([]dht.Addr, error) { return dht.GlobalBootstrapAddrs(network) } }, PeriodicallyAnnounceTorrentsToDht: true, ListenHost: func(string) string { return "" }, UploadRateLimiter: unlimited, DownloadRateLimiter: unlimited, DisableAcceptRateLimiting: true, DropMutuallyCompletePeers: true, HeaderObfuscationPolicy: HeaderObfuscationPolicy{ Preferred: true, RequirePreferred: false, }, CryptoSelector: mse.DefaultCryptoSelector, CryptoProvides: mse.AllSupportedCrypto, ListenPort: 42069, Extensions: defaultPeerExtensionBytes(), AcceptPeerConnections: true, } // cc.ConnTracker.SetNoMaxEntries() // cc.ConnTracker.Timeout = func(conntrack.Entry) time.Duration { return 0 } return cc } type HeaderObfuscationPolicy struct { RequirePreferred bool // Whether the value of Preferred is a strict requirement. Preferred bool // Whether header obfuscation is preferred. }