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/*
Copyright (C) 1993,94,95,96,97,98,2002 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 <hurd/fsys.h>
#include <fcntl.h>
/* Implement fsys_getroot as described in <hurd/fsys.defs>. */
kern_return_t
diskfs_S_fsys_getroot (struct diskfs_control *pt,
mach_port_t reply,
mach_msg_type_name_t replytype,
mach_port_t dotdot,
uid_t *uids,
size_t nuids,
uid_t *gids,
size_t ngids,
int flags,
retry_type *retry,
char *retryname,
file_t *returned_port,
mach_msg_type_name_t *returned_port_poly)
{
error_t err = 0;
mode_t type;
struct protid *newpi;
struct peropen *newpo;
struct iouser user;
struct peropen peropen_context =
{
root_parent: dotdot,
shadow_root_parent: MACH_PORT_NULL,
shadow_root: _diskfs_chroot_directory ? diskfs_root_node : NULL, /* XXX */
path: NULL,
};
if (!pt
|| pt->pi.class != diskfs_control_class)
return EOPNOTSUPP;
flags &= O_HURD;
user.uids = make_idvec ();
user.gids = make_idvec ();
idvec_set_ids (user.uids, uids, nuids);
idvec_set_ids (user.gids, gids, ngids);
#define drop_idvec() idvec_free (user.gids); idvec_free (user.uids)
pthread_rwlock_rdlock (&diskfs_fsys_lock);
pthread_mutex_lock (&diskfs_root_node->lock);
/* This code is similar (but not the same as) the code in
dir-lookup.c that does the same thing. Perhaps a way should
be found to share the logic. */
type = diskfs_root_node->dn_stat.st_mode & S_IFMT;
if (((diskfs_root_node->dn_stat.st_mode & S_IPTRANS)
|| fshelp_translated (&diskfs_root_node->transbox))
&& !(flags & O_NOTRANS))
{
err = fshelp_fetch_root (&diskfs_root_node->transbox,
&peropen_context, dotdot, &user, flags,
_diskfs_translator_callback1,
_diskfs_translator_callback2,
retry, retryname, returned_port);
if (err != ENOENT)
{
pthread_mutex_unlock (&diskfs_root_node->lock);
pthread_rwlock_unlock (&diskfs_fsys_lock);
drop_idvec ();
if (!err)
*returned_port_poly = MACH_MSG_TYPE_MOVE_SEND;
return err;
}
/* ENOENT means the translator was removed in the interim. */
err = 0;
}
if (type == S_IFLNK && !(flags & (O_NOLINK | O_NOTRANS)))
{
/* Handle symlink interpretation */
char pathbuf[diskfs_root_node->dn_stat.st_size + 1];
size_t amt;
if (diskfs_read_symlink_hook)
err = (*diskfs_read_symlink_hook) (diskfs_root_node, pathbuf);
if (!diskfs_read_symlink_hook || err == EINVAL)
err = diskfs_node_rdwr (diskfs_root_node, pathbuf, 0,
diskfs_root_node->dn_stat.st_size, 0,
0, &amt);
pathbuf[amt] = '\0';
pthread_mutex_unlock (&diskfs_root_node->lock);
pthread_rwlock_unlock (&diskfs_fsys_lock);
if (err)
{
drop_idvec ();
return err;
}
if (pathbuf[0] == '/')
{
*retry = FS_RETRY_MAGICAL;
*returned_port = MACH_PORT_NULL;
*returned_port_poly = MACH_MSG_TYPE_COPY_SEND;
strcpy (retryname, pathbuf);
mach_port_deallocate (mach_task_self (), dotdot);
drop_idvec ();
return 0;
}
else
{
*retry = FS_RETRY_REAUTH;
*returned_port = dotdot;
*returned_port_poly = MACH_MSG_TYPE_MOVE_SEND;
strcpy (retryname, pathbuf);
drop_idvec ();
return 0;
}
}
if ((type == S_IFSOCK || type == S_IFBLK
|| type == S_IFCHR || type == S_IFIFO)
&& (flags & (O_READ|O_WRITE|O_EXEC)))
err = EOPNOTSUPP;
if (!err && (flags & O_READ))
err = fshelp_access (&diskfs_root_node->dn_stat, S_IREAD, &user);
if (!err && (flags & O_EXEC))
err = fshelp_access (&diskfs_root_node->dn_stat, S_IEXEC, &user);
if (!err && (flags & (O_WRITE)))
{
if (type == S_IFDIR)
err = EISDIR;
else if (diskfs_check_readonly ())
err = EROFS;
else
err = fshelp_access (&diskfs_root_node->dn_stat,
S_IWRITE, &user);
}
if (err)
{
pthread_mutex_unlock (&diskfs_root_node->lock);
pthread_rwlock_unlock (&diskfs_fsys_lock);
drop_idvec ();
return err;
}
if ((flags & O_NOATIME)
&& (fshelp_isowner (&diskfs_root_node->dn_stat, &user)
== EPERM))
flags &= ~O_NOATIME;
flags &= ~OPENONLY_STATE_MODES;
err = diskfs_make_peropen (diskfs_root_node, flags,
&peropen_context, &newpo);
if (! err)
{
err = diskfs_create_protid (newpo, &user, &newpi);
if (err)
diskfs_release_peropen (newpo);
}
if (! err)
{
mach_port_deallocate (mach_task_self (), dotdot);
*retry = FS_RETRY_NORMAL;
*retryname = '\0';
*returned_port = ports_get_right (newpi);
*returned_port_poly = MACH_MSG_TYPE_MAKE_SEND;
ports_port_deref (newpi);
}
pthread_mutex_unlock (&diskfs_root_node->lock);
pthread_rwlock_unlock (&diskfs_fsys_lock);
drop_idvec ();
return err;
}
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