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])
}
// 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])
}