Пример #1
0
func (*Ufs) Walk(req *srv.Req) {
	fid := req.Fid.Aux.(*Fid)
	tc := req.Tc

	err := fid.stat()
	if err != nil {
		req.RespondError(err)
		return
	}

	if req.Newfid.Aux == nil {
		req.Newfid.Aux = new(Fid)
	}

	nfid := req.Newfid.Aux.(*Fid)
	wqids := make([]p.Qid, len(tc.Wname))
	path := fid.path
	i := 0
	for ; i < len(tc.Wname); i++ {
		p := path + "/" + tc.Wname[i]
		st, err := os.Lstat(p)
		if err != nil {
			if i == 0 {
				req.RespondError(Enoent)
				return
			}

			break
		}

		wqids[i] = *dir2Qid(st)
		path = p
	}

	nfid.path = path
	req.RespondRwalk(wqids[0:i])
}
Пример #2
0
// BUG(mbucc) does not fully implement spec when fid = newfid.
// From http://plan9.bell-labs.com/magic/man2html/5/walk:
//	If newfid is the same as fid, the above discussion applies, with the
//	obvious difference that if the walk changes the state of newfid, it
//	also changes the state of fid; and if newfid is unaffected, then fid
//	is also unaffected.
//
func (u *VuFs) Walk(req *srv.Req) {
	fid := req.Fid.Aux.(*Fid)
	tc := req.Tc

	_, err := os.Stat(fid.path)
	if err != nil {
		req.RespondError(toError(err))
		return
	}

	if req.Newfid.Aux == nil {
		req.Newfid.Aux = new(Fid)
	}

	newfid := req.Newfid.Aux.(*Fid)
	wqids := make([]p.Qid, len(tc.Wname))
	path := fid.path
	i := 0

	// Ensure execute permission on the walk root.
	st, err := os.Stat(path)
	if err != nil {
		req.RespondError(srv.Enoent)
		return
	}
	f, err := dir2Dir(path, st, req.Conn.Srv.Upool)
	if err != nil {
		req.RespondError(toError(err))
		return
	}
	if !CheckPerm(f, req.Fid.User, p.DMEXEC) {
		req.RespondError(srv.Eperm)
		return
	}

	for ; i < len(tc.Wname); i++ {

		var newpath string

		// Don't allow client to dotdot out of the file system root.
		if tc.Wname[i] == ".." {
			if path == u.Root {
				continue
			} else {
				newpath = path[:strings.LastIndex(path, "/")]
				if newpath == u.Root {
					continue
				}
			}
		} else {
			newpath = path + "/" + tc.Wname[i]
		}

		st, err := os.Stat(newpath)
		if err != nil {
			if i == 0 {
				req.RespondError(srv.Enoent)
				return
			}

			break
		}

		wqids[i] = *dir2Qid(st)

		if (wqids[i].Type & p.QTDIR) > 0 {
			f, err := dir2Dir(newpath, st, req.Conn.Srv.Upool)
			if err != nil {
				req.RespondError(toError(err))
				return
			}
			if !CheckPerm(f, req.Fid.User, p.DMEXEC) {
				req.RespondError(srv.Eperm)
				return
			}
		}

		path = newpath
	}

	newfid.path = path
	req.RespondRwalk(wqids[0:i])
}