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/*
Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by Michael I. Bushnell. */
#include "priv.h"
#include "fsys_S.h"
#include "fsys_reply_U.h"
#include <assert.h>
#include <fcntl.h>
#include <string.h>
kern_return_t
trivfs_S_fsys_getroot (struct trivfs_control *cntl,
mach_port_t reply_port,
mach_msg_type_name_t reply_port_type,
mach_port_t dotdot,
uid_t *uids, u_int nuids,
uid_t *gids, u_int ngids,
int flags,
retry_type *do_retry,
char *retry_name,
mach_port_t *newpt,
mach_msg_type_name_t *newpttype)
{
int perms;
error_t err = 0;
mach_port_t new_realnode;
struct trivfs_protid *cred;
struct iouser *user;
struct idvec *uvec, *gvec;
if (!cntl)
return EOPNOTSUPP;
if (trivfs_getroot_hook)
{
err = (*trivfs_getroot_hook) (cntl, reply_port, reply_port_type, dotdot,
uids, nuids, gids, ngids, flags,
do_retry, retry_name, newpt, newpttype);
if (err != EAGAIN)
return err;
}
if ((flags & (O_READ|O_WRITE|O_EXEC) & trivfs_allow_open)
!= (flags & (O_READ|O_WRITE|O_EXEC)))
return EOPNOTSUPP;
/* O_CREAT and O_EXCL are not meaningful here; O_NOLINK and O_NOTRANS
will only be useful when trivfs supports translators (which it doesn't
now). */
flags &= O_HURD;
flags &= ~(O_CREAT|O_EXCL|O_NOLINK|O_NOTRANS);
err = io_restrict_auth (cntl->underlying,
&new_realnode, uids, nuids, gids, ngids);
if (err)
return err;
file_check_access (new_realnode, &perms);
if ((flags & (O_READ|O_WRITE|O_EXEC) & perms)
!= (flags & (O_READ|O_WRITE|O_EXEC)))
err = EACCES;
uvec = make_idvec ();
gvec = make_idvec ();
idvec_set_ids (uvec, uids, nuids);
idvec_set_ids (gvec, gids, ngids);
user = iohelp_create_iouser (uvec, gvec);
if (!err && trivfs_check_open_hook)
err = (*trivfs_check_open_hook) (cntl, user, flags);
if (!err)
err = trivfs_open (cntl, user, flags, new_realnode, &cred);
if (err)
{
mach_port_deallocate (mach_task_self (), new_realnode);
iohelp_free_iouser (user);
}
else
{
*do_retry = FS_RETRY_NORMAL;
*retry_name = '\0';
*newpt = ports_get_right (cred);
*newpttype = MACH_MSG_TYPE_MAKE_SEND;
ports_port_deref (cred);
mach_port_deallocate (mach_task_self (), dotdot);
}
return err;
}
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