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/*
Copyright (C) 1996 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG.
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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include "netfs.h"
#include <hurd/paths.h>
#include <hurd/fsys.h>
error_t
netfs_S_file_set_translator (struct protid *user,
int passive_flags, int active_flags,
int killtrans_flags, char *passive,
mach_msg_type_number_t passivelen,
mach_port_t active)
{
struct node *np;
error_t err = 0;
uid_t *uids, *gids;
int nuids, ngids;
int i;
mach_port_t control;
if (!user)
return EOPNOTSUPP;
if (!(passive_flags & FS_TRANS_SET) && !(active_flags & FS_TRANS_SET))
return 0;
if (passive && passive[passivelen - 1])
return EINVAL;
np = user->po->np;
mutex_lock (&np->lock);
if (active_flags & FS_TRANS_SET)
{
/* Validate--user must be owner */
netfs_interpret_credential (user->credential, &uids, &nuids,
&gids, &ngids);
err = netfs_validate_stat (np, user->credential);
if (err)
goto out;
for (i = 0; i < nuids; i++)
if (uids[i] == 0 || uids[i] == np->nn_stat.st_uid)
break;
if (i == nuids)
{
mutex_unlock (&np->lock);
return EBUSY;
}
err = fshelp_fetch_control (&np->transbox, &control);
if (err)
goto out;
if (control != MACH_PORT_NULL
&& (active_flags & FS_TRANS_EXCL) == 0)
{
mutex_unlock (&np->lock);
err = fsys_goaway (control, killtrans_flags);
if (err && err != MIG_SERVER_DIED && err != MACH_SEND_INVALID_DEST)
return err;
err = 0;
mutex_lock (&np->lock);
}
}
if ((passive_flags & FS_TRANS_SET)
&& (passive_flags & FS_TRANS_EXCL))
{
err = netfs_validate_stat (np, user->credential);
if (!err && np->istranslated)
err = EBUSY;
if (err)
goto out;
}
if (active_flags & FS_TRANS_SET)
{
err = fshelp_set_active (&np->transbox, active,
active_flags & FS_TRANS_EXCL);
if (err)
goto out;
}
if (passive_flags & FS_TRANS_SET)
{
mode_t newmode = 0;
if (!(passive_flags & FS_TRANS_FORCE))
{
/* Short circuited translators */
if (!strcmp (passive, _HURD_SYMLINK))
newmode = S_IFLNK;
else if (!(strcmp (passive, _HURD_CHRDEV)))
newmode = S_IFCHR;
else if (!strcmp (passive, _HURD_BLKDEV))
newmode = S_IFBLK;
else if (!strcmp (passive, _HURD_FIFO))
newmode = S_IFIFO;
else if (!strcmp (passive, _HURD_IFSOCK))
newmode = S_IFSOCK;
}
switch (newmode)
{
int major, minor;
char *arg;
case S_IFBLK:
case S_IFCHR:
/* Find the device number from the arguments
of the translator. */
arg = passive + strlen (passive) + 1;
assert (arg <= passive + passivelen);
if (arg == passive + passivelen)
{
mutex_unlock (&np->lock);
return EINVAL;
}
major = strtol (arg, 0, 0);
arg = arg + strlen (arg) + 1;
assert (arg < passive + passivelen);
if (arg == passive + passivelen)
{
mutex_unlock (&np->lock);
return EINVAL;
}
minor = strtol (arg, 0, 0);
err = netfs_attempt_mkdev (user->credential, np,
newmode, major, minor);
if (err == EOPNOTSUPP)
goto fallback;
break;
case S_IFLNK:
arg = passive + strlen (passive) + 1;
assert (arg <= passive + passivelen);
if (arg == passive + passivelen)
{
mutex_unlock (&np->lock);
return EINVAL;
}
err = netfs_attempt_mksymlink (user->credential, np, arg);
if (err == EOPNOTSUPP)
goto fallback;
break;
default:
err = netfs_validate_stat (np, user->credential);
if (!err)
err = netfs_attempt_chmod (user->credential, np,
((np->nn_stat.st_mode & ~S_IFMT)
| newmode));
if (err == EOPNOTSUPP)
goto fallback;
break;
case 0:
fallback:
err = netfs_set_translator (user->credential, np,
passive, passivelen);
break;
}
}
out:
mutex_unlock (&np->lock);
return err;
}
|
