87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
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package nfs
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import (
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"bytes"
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"context"
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"os"
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"github.com/willscott/go-nfs-client/nfs/xdr"
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)
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func lookupSuccessResponse(ctx context.Context, handle []byte, entPath, dirPath []string, fs Filesystem) ([]byte, error) {
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writer := bytes.NewBuffer([]byte{})
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if err := xdr.Write(writer, uint32(NFSStatusOk)); err != nil {
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return nil, err
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}
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if err := xdr.Write(writer, handle); err != nil {
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return nil, err
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}
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if err := WritePostOpAttrs(writer, tryStat(ctx, fs, entPath)); err != nil {
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return nil, err
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}
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if err := WritePostOpAttrs(writer, tryStat(ctx, fs, dirPath)); err != nil {
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return nil, err
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}
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return writer.Bytes(), nil
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}
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func onLookup(ctx context.Context, w *response, userHandle Handler) error {
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w.errorFmt = opAttrErrorFormatter
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obj := DirOpArg{}
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err := xdr.Read(w.req.Body, &obj)
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if err != nil {
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return &NFSStatusError{NFSStatusInval, err}
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}
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fs, p, err := userHandle.FromHandle(obj.Handle)
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if err != nil {
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return &NFSStatusError{NFSStatusStale, err}
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}
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dirInfo, err := fs.Lstat(ctx, fs.Join(p...))
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if err != nil || !dirInfo.IsDir() {
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return &NFSStatusError{NFSStatusNotDir, err}
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}
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// Special cases for "." and ".."
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if bytes.Equal(obj.Filename, []byte(".")) {
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resp, err := lookupSuccessResponse(ctx, obj.Handle, p, p, fs)
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if err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := w.Write(resp); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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return nil
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}
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if bytes.Equal(obj.Filename, []byte("..")) {
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if len(p) == 0 {
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return &NFSStatusError{NFSStatusAccess, os.ErrPermission}
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}
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pPath := p[0 : len(p)-1]
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pHandle := userHandle.ToHandle(fs, pPath)
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resp, err := lookupSuccessResponse(ctx, pHandle, pPath, p, fs)
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if err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := w.Write(resp); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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return nil
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}
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reqPath := append(p, string(obj.Filename))
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if _, err = fs.Lstat(ctx, fs.Join(reqPath...)); err != nil {
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return &NFSStatusError{NFSStatusNoEnt, os.ErrNotExist}
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}
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newHandle := userHandle.ToHandle(fs, reqPath)
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resp, err := lookupSuccessResponse(ctx, newHandle, reqPath, p, fs)
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if err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := w.Write(resp); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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return nil
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}
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