86 lines
1.8 KiB
Go
86 lines
1.8 KiB
Go
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/sha1"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"os"
|
|
"path/filepath"
|
|
|
|
"github.com/anacrolix/tagflag"
|
|
"github.com/edsrzf/mmap-go"
|
|
|
|
"github.com/anacrolix/torrent/metainfo"
|
|
"github.com/anacrolix/torrent/mmap_span"
|
|
)
|
|
|
|
func mmapFile(name string) (mm mmap.MMap, err error) {
|
|
f, err := os.Open(name)
|
|
if err != nil {
|
|
return
|
|
}
|
|
defer f.Close()
|
|
fi, err := f.Stat()
|
|
if err != nil {
|
|
return
|
|
}
|
|
if fi.Size() == 0 {
|
|
return
|
|
}
|
|
return mmap.MapRegion(f, -1, mmap.RDONLY, mmap.COPY, 0)
|
|
}
|
|
|
|
func verifyTorrent(info *metainfo.Info, root string) error {
|
|
span := new(mmap_span.MMapSpan)
|
|
for _, file := range info.UpvertedFiles() {
|
|
filename := filepath.Join(append([]string{root, info.Name}, file.Path...)...)
|
|
mm, err := mmapFile(filename)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if int64(len(mm)) != file.Length {
|
|
return fmt.Errorf("file %q has wrong length", filename)
|
|
}
|
|
span.Append(mm)
|
|
}
|
|
span.InitIndex()
|
|
for i, numPieces := 0, info.NumPieces(); i < numPieces; i += 1 {
|
|
p := info.Piece(i)
|
|
hash := sha1.New()
|
|
_, err := io.Copy(hash, io.NewSectionReader(span, p.Offset(), p.Length()))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
good := bytes.Equal(hash.Sum(nil), p.Hash().Bytes())
|
|
if !good {
|
|
return fmt.Errorf("hash mismatch at piece %d", i)
|
|
}
|
|
fmt.Printf("%d: %v: %v\n", i, p.Hash(), good)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
log.SetFlags(log.Flags() | log.Lshortfile)
|
|
var flags = struct {
|
|
DataDir string
|
|
tagflag.StartPos
|
|
TorrentFile string
|
|
}{}
|
|
tagflag.Parse(&flags)
|
|
metaInfo, err := metainfo.LoadFromFile(flags.TorrentFile)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
info, err := metaInfo.UnmarshalInfo()
|
|
if err != nil {
|
|
log.Fatalf("error unmarshalling info: %s", err)
|
|
}
|
|
err = verifyTorrent(&info, flags.DataDir)
|
|
if err != nil {
|
|
log.Fatalf("torrent failed verification: %s", err)
|
|
}
|
|
}
|