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btserver.go
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btserver.go
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package torr
import (
"context"
"fmt"
"log"
"net"
"sync"
"github.com/anacrolix/publicip"
"github.com/anacrolix/torrent"
"github.com/anacrolix/torrent/metainfo"
"github.com/Terisback/TorrServer/server/settings"
"github.com/Terisback/TorrServer/server/torr/storage/torrstor"
"github.com/Terisback/TorrServer/server/torr/utils"
"github.com/Terisback/TorrServer/server/version"
)
type BTServer struct {
config *torrent.ClientConfig
client *torrent.Client
storage *torrstor.Storage
torrents map[metainfo.Hash]*Torrent
mu sync.Mutex
}
var privateIPBlocks []*net.IPNet
func init() {
for _, cidr := range []string{
"127.0.0.0/8", // IPv4 loopback
"10.0.0.0/8", // RFC1918
"172.16.0.0/12", // RFC1918
"192.168.0.0/16", // RFC1918
"169.254.0.0/16", // RFC3927 link-local
"::1/128", // IPv6 loopback
"fe80::/10", // IPv6 link-local
"fc00::/7", // IPv6 unique local addr
} {
_, block, err := net.ParseCIDR(cidr)
if err != nil {
panic(fmt.Errorf("parse error on %q: %v", cidr, err))
}
privateIPBlocks = append(privateIPBlocks, block)
}
}
func NewBTS() *BTServer {
bts := new(BTServer)
bts.torrents = make(map[metainfo.Hash]*Torrent)
return bts
}
func (bt *BTServer) Connect() error {
bt.mu.Lock()
defer bt.mu.Unlock()
var err error
bt.configure(context.TODO())
bt.client, err = torrent.NewClient(bt.config)
bt.torrents = make(map[metainfo.Hash]*Torrent)
InitApiHelper(bt)
return err
}
func (bt *BTServer) Disconnect() {
bt.mu.Lock()
defer bt.mu.Unlock()
if bt.client != nil {
bt.client.Close()
bt.client = nil
utils.FreeOSMemGC()
}
}
func (bt *BTServer) configure(ctx context.Context) {
blocklist, _ := utils.ReadBlockedIP()
bt.config = torrent.NewDefaultClientConfig()
bt.storage = torrstor.NewStorage(settings.BTsets.CacheSize)
bt.config.DefaultStorage = bt.storage
userAgent := "qBittorrent/4.3.9"
peerID := "-qB4390-"
upnpID := "TorrServer/" + version.Version
cliVers := userAgent
bt.config.Debug = settings.BTsets.EnableDebug
bt.config.DisableIPv6 = !settings.BTsets.EnableIPv6
bt.config.DisableTCP = settings.BTsets.DisableTCP
bt.config.DisableUTP = settings.BTsets.DisableUTP
// https://github.com/anacrolix/torrent/issues/703
// bt.config.DisableWebtorrent = true // NE
// bt.config.DisableWebseeds = false // NE
bt.config.NoDefaultPortForwarding = settings.BTsets.DisableUPNP
bt.config.NoDHT = settings.BTsets.DisableDHT
bt.config.DisablePEX = settings.BTsets.DisablePEX
bt.config.NoUpload = settings.BTsets.DisableUpload
bt.config.IPBlocklist = blocklist
bt.config.Bep20 = peerID
bt.config.PeerID = utils.PeerIDRandom(peerID)
bt.config.UpnpID = upnpID
bt.config.HTTPUserAgent = userAgent
bt.config.ExtendedHandshakeClientVersion = cliVers
bt.config.EstablishedConnsPerTorrent = settings.BTsets.ConnectionsLimit
bt.config.TotalHalfOpenConns = 500
// Encryption/Obfuscation
bt.config.EncryptionPolicy = torrent.EncryptionPolicy{ // OE
ForceEncryption: settings.BTsets.ForceEncrypt, // OE
} // OE
// bt.config.HeaderObfuscationPolicy = torrent.HeaderObfuscationPolicy{ // NE
// RequirePreferred: settings.BTsets.ForceEncrypt, // NE
// Preferred: true, // NE
// } // NE
if settings.BTsets.DownloadRateLimit > 0 {
bt.config.DownloadRateLimiter = utils.Limit(settings.BTsets.DownloadRateLimit * 1024)
}
if settings.BTsets.UploadRateLimit > 0 {
bt.config.UploadRateLimiter = utils.Limit(settings.BTsets.UploadRateLimit * 1024)
}
if settings.TorAddr != "" {
log.Println("Set listen addr", settings.TorAddr)
bt.config.SetListenAddr(settings.TorAddr)
} else {
if settings.BTsets.PeersListenPort > 0 {
log.Println("Set listen port", settings.BTsets.PeersListenPort)
bt.config.ListenPort = settings.BTsets.PeersListenPort
} else {
log.Println("Set listen port to random autoselect (0)")
bt.config.ListenPort = 0
}
}
log.Println("Client config:", settings.BTsets)
var err error
// set public IPv4
if settings.PubIPv4 != "" {
if ip4 := net.ParseIP(settings.PubIPv4); ip4.To4() != nil && !isPrivateIP(ip4) {
bt.config.PublicIp4 = ip4
}
}
if bt.config.PublicIp4 == nil {
bt.config.PublicIp4, err = publicip.Get4(ctx)
if err != nil {
log.Printf("error getting public ipv4 address: %v", err)
}
}
if bt.config.PublicIp4 != nil {
log.Println("PublicIp4:", bt.config.PublicIp4)
}
// set public IPv6
if settings.PubIPv6 != "" {
if ip6 := net.ParseIP(settings.PubIPv6); ip6.To16() != nil && ip6.To4() == nil && !isPrivateIP(ip6) {
bt.config.PublicIp6 = ip6
}
}
if bt.config.PublicIp6 == nil && settings.BTsets.EnableIPv6 {
bt.config.PublicIp6, err = publicip.Get6(ctx)
if err != nil {
log.Printf("error getting public ipv6 address: %v", err)
}
}
if bt.config.PublicIp6 != nil {
log.Println("PublicIp6:", bt.config.PublicIp6)
}
}
func (bt *BTServer) GetTorrent(hash torrent.InfoHash) *Torrent {
if torr, ok := bt.torrents[hash]; ok {
return torr
}
return nil
}
func (bt *BTServer) ListTorrents() map[metainfo.Hash]*Torrent {
list := make(map[metainfo.Hash]*Torrent)
for k, v := range bt.torrents {
list[k] = v
}
return list
}
func (bt *BTServer) RemoveTorrent(hash torrent.InfoHash) bool {
if torr, ok := bt.torrents[hash]; ok {
return torr.Close()
}
return false
}
func isPrivateIP(ip net.IP) bool {
if ip.IsLoopback() || ip.IsPrivate() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
return true
}
for _, block := range privateIPBlocks {
if block.Contains(ip) {
return true
}
}
return false
}
func getPublicIp4() net.IP {
ifaces, err := net.Interfaces()
if err != nil {
log.Println("Error get public IPv4")
return nil
}
for _, i := range ifaces {
addrs, _ := i.Addrs()
if i.Flags&net.FlagUp == net.FlagUp {
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if !isPrivateIP(ip) && ip.To4() != nil {
return ip
}
}
}
}
return nil
}
func getPublicIp6() net.IP {
ifaces, err := net.Interfaces()
if err != nil {
log.Println("Error get public IPv6")
return nil
}
for _, i := range ifaces {
addrs, _ := i.Addrs()
if i.Flags&net.FlagUp == net.FlagUp {
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if !isPrivateIP(ip) && ip.To16() != nil && ip.To4() == nil {
return ip
}
}
}
}
return nil
}