164 lines
3.3 KiB
Go
164 lines
3.3 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"io"
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"log"
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"net"
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"os"
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"os/signal"
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_ "github.com/anacrolix/envpprof"
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"github.com/anacrolix/torrent/dht"
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)
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var (
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tableFileName = flag.String("tableFile", "", "name of file for storing node info")
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serveAddr = flag.String("serveAddr", ":0", "local UDP address")
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infoHash = flag.String("infoHash", "", "torrent infohash")
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once = flag.Bool("once", false, "only do one scrape iteration")
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s *dht.Server
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quitting = make(chan struct{})
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)
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func loadTable() error {
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if *tableFileName == "" {
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return nil
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}
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f, err := os.Open(*tableFileName)
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if os.IsNotExist(err) {
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return nil
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}
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if err != nil {
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return fmt.Errorf("error opening table file: %s", err)
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}
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defer f.Close()
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added := 0
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for {
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b := make([]byte, dht.CompactIPv4NodeInfoLen)
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_, err := io.ReadFull(f, b)
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if err == io.EOF {
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break
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}
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if err != nil {
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return fmt.Errorf("error reading table file: %s", err)
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}
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var ni dht.NodeInfo
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err = ni.UnmarshalCompactIPv4(b)
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if err != nil {
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return fmt.Errorf("error unmarshaling compact node info: %s", err)
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}
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s.AddNode(ni)
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added++
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}
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log.Printf("loaded %d nodes from table file", added)
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return nil
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}
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func init() {
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log.SetFlags(log.LstdFlags | log.Lshortfile)
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flag.Parse()
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switch len(*infoHash) {
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case 20:
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case 40:
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_, err := fmt.Sscanf(*infoHash, "%x", infoHash)
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if err != nil {
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log.Fatal(err)
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}
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default:
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log.Fatal("require 20 byte infohash")
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}
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var err error
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s, err = dht.NewServer(&dht.ServerConfig{
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Addr: *serveAddr,
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})
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if err != nil {
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log.Fatal(err)
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}
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err = loadTable()
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if err != nil {
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log.Fatalf("error loading table: %s", err)
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}
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log.Printf("dht server on %s, ID is %x", s.Addr(), s.ID())
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setupSignals()
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}
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func saveTable() error {
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goodNodes := s.Nodes()
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if *tableFileName == "" {
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if len(goodNodes) != 0 {
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log.Print("good nodes were discarded because you didn't specify a table file")
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}
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return nil
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}
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f, err := os.OpenFile(*tableFileName, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
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if err != nil {
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return fmt.Errorf("error opening table file: %s", err)
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}
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defer f.Close()
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for _, nodeInfo := range goodNodes {
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var b [dht.CompactIPv4NodeInfoLen]byte
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err := nodeInfo.PutCompact(b[:])
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if err != nil {
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return fmt.Errorf("error compacting node info: %s", err)
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}
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_, err = f.Write(b[:])
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if err != nil {
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return fmt.Errorf("error writing compact node info: %s", err)
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}
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}
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log.Printf("saved %d nodes to table file", len(goodNodes))
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return nil
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}
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func setupSignals() {
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ch := make(chan os.Signal)
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signal.Notify(ch, os.Interrupt)
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go func() {
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<-ch
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close(quitting)
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}()
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}
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func main() {
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seen := make(map[string]struct{})
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getPeers:
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for {
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ps, err := s.Announce(*infoHash, 0, false)
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if err != nil {
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log.Fatal(err)
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}
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values:
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for {
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select {
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case v, ok := <-ps.Peers:
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if !ok {
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break values
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}
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log.Printf("received %d peers from %x", len(v.Peers), v.NodeInfo.ID)
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for _, p := range v.Peers {
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if _, ok := seen[p.String()]; ok {
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continue
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}
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seen[p.String()] = struct{}{}
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fmt.Println((&net.UDPAddr{
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IP: p.IP[:],
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Port: int(p.Port),
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}).String())
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}
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case <-quitting:
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break getPeers
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}
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}
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if *once {
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break
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}
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}
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if err := saveTable(); err != nil {
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log.Printf("error saving node table: %s", err)
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}
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}
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