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torsniff.go
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torsniff.go
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package main
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"net"
"os"
"path"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/marksamman/bencode"
"github.com/mitchellh/go-homedir"
"github.com/spf13/cobra"
"go.etcd.io/etcd/pkg/fileutil"
)
const (
directory = "torrents"
)
type tfile struct {
name string
length int64
}
func (t *tfile) String() string {
return fmt.Sprintf("name: %s\n, size: %d\n", t.name, t.length)
}
type torrent struct {
infohashHex string
name string
length int64
files []*tfile
}
func (t *torrent) String() string {
return fmt.Sprintf(
"link: %s\nname: %s\nsize: %d\nfile: %d\n",
fmt.Sprintf("magnet:?xt=urn:btih:%s", t.infohashHex),
t.name,
t.length,
len(t.files),
)
}
func parseTorrent(meta []byte, infohashHex string) (*torrent, error) {
dict, err := bencode.Decode(bytes.NewBuffer(meta))
if err != nil {
return nil, err
}
t := &torrent{infohashHex: infohashHex}
if name, ok := dict["name.utf-8"].(string); ok {
t.name = name
} else if name, ok := dict["name"].(string); ok {
t.name = name
}
if length, ok := dict["length"].(int64); ok {
t.length = length
}
var totalSize int64
var extractFiles = func(file map[string]interface{}) {
var filename string
var filelength int64
if inter, ok := file["path.utf-8"].([]interface{}); ok {
name := make([]string, len(inter))
for i, v := range inter {
name[i] = fmt.Sprint(v)
}
filename = strings.Join(name, "/")
} else if inter, ok := file["path"].([]interface{}); ok {
name := make([]string, len(inter))
for i, v := range inter {
name[i] = fmt.Sprint(v)
}
filename = strings.Join(name, "/")
}
if length, ok := file["length"].(int64); ok {
filelength = length
totalSize += filelength
}
t.files = append(t.files, &tfile{name: filename, length: filelength})
}
if files, ok := dict["files"].([]interface{}); ok {
for _, file := range files {
if f, ok := file.(map[string]interface{}); ok {
extractFiles(f)
}
}
}
if t.length == 0 {
t.length = totalSize
}
if len(t.files) == 0 {
t.files = append(t.files, &tfile{name: t.name, length: t.length})
}
return t, nil
}
type torsniff struct {
laddr string
maxFriends int
maxPeers int
secret string
timeout time.Duration
blacklist *blackList
dir string
}
func (t *torsniff) run() error {
tokens := make(chan struct{}, t.maxPeers)
dht, err := newDHT(t.laddr, t.maxFriends)
if err != nil {
return err
}
dht.run()
log.Println("running, it may take a few minutes...")
for {
select {
case <-dht.announcements.wait():
for {
if ac := dht.announcements.get(); ac != nil {
tokens <- struct{}{}
go t.work(ac, tokens)
continue
}
break
}
case <-dht.die:
return dht.errDie
}
}
}
func (t *torsniff) work(ac *announcement, tokens chan struct{}) {
defer func() {
<-tokens
}()
if t.isTorrentExist(ac.infohashHex) {
return
}
peerAddr := ac.peer.String()
if t.blacklist.has(peerAddr) {
return
}
wire := newMetaWire(string(ac.infohash), peerAddr, t.timeout)
defer wire.free()
meta, err := wire.fetch()
if err != nil {
t.blacklist.add(peerAddr)
return
}
if err := t.saveTorrent(ac.infohashHex, meta); err != nil {
return
}
torrent, err := parseTorrent(meta, ac.infohashHex)
if err != nil {
return
}
log.Println(torrent)
}
func (t *torsniff) isTorrentExist(infohashHex string) bool {
name, _ := t.torrentPath(infohashHex)
_, err := os.Stat(name)
if os.IsNotExist(err) {
return false
}
return err == nil
}
func (t *torsniff) saveTorrent(infohashHex string, data []byte) error {
name, dir := t.torrentPath(infohashHex)
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
d, err := bencode.Decode(bytes.NewBuffer(data))
if err != nil {
return err
}
f, err := fileutil.TryLockFile(name, os.O_WRONLY|os.O_CREATE, 0755)
if err != nil {
return err
}
defer f.Close()
_, err = f.Write(bencode.Encode(map[string]interface{}{
"info": d,
}))
if err != nil {
return err
}
return nil
}
func (t *torsniff) torrentPath(infohashHex string) (name string, dir string) {
dir = path.Join(t.dir, infohashHex[:2], infohashHex[len(infohashHex)-2:])
name = path.Join(dir, infohashHex+".torrent")
return
}
func main() {
log.SetFlags(0)
var addr string
var port uint16
var peers int
var timeout time.Duration
var dir string
var verbose bool
var friends int
home, err := homedir.Dir()
userHome := path.Join(home, directory)
root := &cobra.Command{
Use: "torsniff",
Short: "torsniff - A sniffer that sniffs torrents from BitTorrent network.",
SilenceUsage: true,
}
root.RunE = func(cmd *cobra.Command, args []string) error {
if dir == userHome && err != nil {
return err
}
absDir, err := filepath.Abs(dir)
if err != nil {
return err
}
log.SetOutput(ioutil.Discard)
if verbose {
log.SetOutput(os.Stdout)
}
p := &torsniff{
laddr: net.JoinHostPort(addr, strconv.Itoa(int(port))),
timeout: timeout,
maxFriends: friends,
maxPeers: peers,
secret: string(randBytes(20)),
dir: absDir,
blacklist: newBlackList(5*time.Minute, 50000),
}
return p.run()
}
root.Flags().StringVarP(&addr, "addr", "a", "", "listen on given address (default all, ipv4 and ipv6)")
root.Flags().Uint16VarP(&port, "port", "p", 6881, "listen on given port")
root.Flags().IntVarP(&friends, "friends", "f", 500, "max fiends to make with per second")
root.Flags().IntVarP(&peers, "peers", "e", 400, "max peers to connect to download torrents")
root.Flags().DurationVarP(&timeout, "timeout", "t", 10*time.Second, "max time allowed for downloading torrents")
root.Flags().StringVarP(&dir, "dir", "d", userHome, "the directory to store the torrents")
root.Flags().BoolVarP(&verbose, "verbose", "v", true, "run in verbose mode")
if err := root.Execute(); err != nil {
fmt.Println(fmt.Errorf("could not start: %s", err))
}
}