package torrent import ( "crypto/tls" "net" "net/http" "time" "golang.org/x/time/rate" "github.com/anacrolix/dht" "github.com/anacrolix/missinggo" "github.com/anacrolix/missinggo/expect" "github.com/anacrolix/torrent/iplist" "github.com/anacrolix/torrent/storage" ) var DefaultHTTPClient = &http.Client{ Timeout: time.Second * 15, Transport: &http.Transport{ Dial: (&net.Dialer{ Timeout: 15 * time.Second, }).Dial, TLSHandshakeTimeout: 15 * time.Second, TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, }, } var DefaultHTTPUserAgent = "Go-Torrent/1.0" // Override Client defaults. type Config 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 // 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 dht.StartingNodesGetter // 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 upload slightly more than we download from each // peer. 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 // 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. DefaultStorage storage.ClientImpl EncryptionPolicy 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"` // HTTP client used to query the tracker endpoint. Default is DefaultHTTPClient HTTP *http.Client // HTTPUserAgent changes default UserAgent for HTTP requests HTTPUserAgent string `long:"http-user-agent"` // 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 // default "go.torrent dev 20150624" // 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 // default "-GT0001-" NominalDialTimeout time.Duration // default time.Second * 30 MinDialTimeout time.Duration // default 5 * time.Second EstablishedConnsPerTorrent int // default 80 HalfOpenConnsPerTorrent int // default 80 TorrentPeersHighWater int // default 200 TorrentPeersLowWater int // default 50 // 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 // default 20 * time.Second PublicIp4 net.IP PublicIp6 net.IP } func (cfg *Config) SetListenAddr(addr string) *Config { host, port, err := missinggo.ParseHostPort(addr) expect.Nil(err) cfg.ListenHost = func(string) string { return host } cfg.ListenPort = port return cfg } func (cfg *Config) setDefaults() { if cfg.HTTP == nil { cfg.HTTP = DefaultHTTPClient } if cfg.HTTPUserAgent == "" { cfg.HTTPUserAgent = DefaultHTTPUserAgent } if cfg.ExtendedHandshakeClientVersion == "" { cfg.ExtendedHandshakeClientVersion = "go.torrent dev 20150624" } if cfg.Bep20 == "" { cfg.Bep20 = "-GT0001-" } if cfg.NominalDialTimeout == 0 { cfg.NominalDialTimeout = 30 * time.Second } if cfg.MinDialTimeout == 0 { cfg.MinDialTimeout = 5 * time.Second } if cfg.EstablishedConnsPerTorrent == 0 { cfg.EstablishedConnsPerTorrent = 50 } if cfg.HalfOpenConnsPerTorrent == 0 { cfg.HalfOpenConnsPerTorrent = (cfg.EstablishedConnsPerTorrent + 1) / 2 } if cfg.TorrentPeersHighWater == 0 { // Memory and freshness are the concern here. cfg.TorrentPeersHighWater = 500 } if cfg.TorrentPeersLowWater == 0 { cfg.TorrentPeersLowWater = 2 * cfg.HalfOpenConnsPerTorrent } if cfg.HandshakesTimeout == 0 { cfg.HandshakesTimeout = 20 * time.Second } if cfg.DhtStartingNodes == nil { cfg.DhtStartingNodes = dht.GlobalBootstrapAddrs } if cfg.ListenHost == nil { cfg.ListenHost = func(string) string { return "" } } } type EncryptionPolicy struct { DisableEncryption bool ForceEncryption bool // Don't allow unobfuscated connections. PreferNoEncryption bool }