/* This is a courtesy callback from npfs to let us know that
* the fid we are parasitically attached to is being destroyed.
*/
void
diod_fiddestroy (Npfid *fid)
{
Fid *f = fid->aux;
_fidfree (f);
fid->aux = NULL;
}
/* Tattach - attach a new user (fid->user) to aname.
* diod_auth.c::diod_checkauth first authenticates/authorizes user
*/
Npfcall*
diod_attach (Npfid *fid, Npfid *afid, Npstr *aname)
{
Npfcall* ret = NULL;
Fid *f = NULL;
Npqid qid;
struct stat sb;
if (aname->len == 0 || *aname->str != '/') {
np_uerror (EPERM);
goto error;
}
if (!(f = _fidalloc ()) || !(f->path = np_strdup (aname))) {
np_uerror (ENOMEM);
goto error;
}
if (diod_conf_opt_runasuid ()) {
if (fid->user->uid != diod_conf_get_runasuid ()) {
np_uerror (EPERM);
goto error;
}
}
if (!diod_match_exports (f->path, fid->conn, fid->user, &f->xflags))
goto error;
if (stat (f->path, &sb) < 0) { /* OK to follow symbolic links */
np_uerror (errno);
goto error;
}
if (!S_ISDIR (sb.st_mode)) {
np_uerror (ENOTDIR);
goto error;
}
_ustat2qid (&sb, &qid);
if ((ret = np_create_rattach (&qid)) == NULL) {
np_uerror (ENOMEM);
goto error;
}
fid->aux = f;
np_fid_incref (fid);
return ret;
error:
errn (np_rerror (), "diod_attach %s@%s:%.*s", fid->user->uname,
np_conn_get_client_id (fid->conn), aname->len, aname->str);
if (f)
_fidfree (f);
return NULL;
}
/* Twalk - walk a file path
* Called from fcall.c::np_walk () to clone the fid.
* On error, call np_uerror () and return 0.
*/
int
diod_clone (Npfid *fid, Npfid *newfid)
{
Fid *f = fid->aux;
Fid *nf = NULL;
if (!(nf = _fidalloc ()) || !(nf->path = strdup (f->path))) {
np_uerror (ENOMEM);
goto error;
}
nf->xflags = f->xflags;
newfid->aux = nf;
return 1;
error:
errn (np_rerror (), "diod_clone %s@%s:%s",
fid->user->uname, np_conn_get_client_id (fid->conn), f->path);
if (nf)
_fidfree (nf);
return 0;
}
