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