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/*
Copyright (C) 1994, 1995, 1996 Free Software Foundation
This program 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.
This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include "io_S.h"
/* Tell if the array LIST (of size N) contains a member equal to QUERY. */
static inline int
listmember (int *list, int query, int n)
{
int i;
for (i = 0; i < n; i++)
if (list[i] == query)
return 1;
return 0;
}
/* Implement io_restrict_auth as described in <hurd/io.defs>. */
kern_return_t
diskfs_S_io_restrict_auth (struct protid *cred,
mach_port_t *newport,
mach_msg_type_name_t *newportpoly,
uid_t *uids,
u_int nuids,
gid_t *gids,
u_int ngids)
{
error_t err;
struct idvec *uvec, *gvec;
struct protid *newpi;
int i;
if (!cred)
return EOPNOTSUPP;
uvec = make_idvec ();
gvec = make_idvec ();
if (idvec_contains (cred->user->uids, 0))
{
/* CRED has root access, and so may use any ids. */
idvec_set_ids (uvec, uids, nuids);
idvec_set_ids (gvec, gids, ngids);
}
else
{
/* Otherwise, use any of the requested ids that CRED already has. */
for (i = 0; i < cred->user->uids->num; i++)
if (listmember (uids, cred->user->uids->ids[i], nuids))
idvec_add (uvec, cred->user->uids->ids[i]);
for (i = 0; i < cred->user->gids->num; i++)
if (listmember (gids, cred->user->gids->ids[i], ngids))
idvec_add (gvec, cred->user->gids->ids[i]);
}
mutex_lock (&cred->po->np->lock);
err = diskfs_create_protid (cred->po, iohelp_create_iouser (uvec, gvec),
&newpi);
if (! err)
{
*newport = ports_get_right (newpi);
*newportpoly = MACH_MSG_TYPE_MAKE_SEND;
ports_port_deref (newpi);
}
mutex_unlock (&cred->po->np->lock);
return err;
}
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