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/*
Copyright (C) 1995 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 "io_S.h"
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;
}
error_t
netfs_S_io_restrict_auth (struct protid *user,
mach_port_t *newport,
mach_msg_type_name_t *newporttype,
uid_t *uids,
mach_msg_type_number_t nuids,
gid_t *gids,
mach_msg_type_number_t ngids)
{
uid_t *newuids, *newgids, *olduids, *oldgids;
int i, newnuids, newngids, oldnuids, oldngids;
struct protid *newpi;
if (!user)
return EOPNOTSUPP;
mutex_lock (&user->po->np->lock);
netfs_interpret_credential (user->credential, &olduids, &oldnuids,
&oldgids, &oldngids);
newuids = alloca (sizeof (uid_t) * oldnuids);
newgids = alloca (sizeof (gid_t) * oldngids);
for (i = newnuids = 0; i < oldnuids; i++)
if (listmember (uids, olduids[i], nuids))
newuids[newnuids++] = olduids[i];
for (i = newngids = 0; i < oldngids; i++)
if (listmember (gids, oldgids[i], ngids))
newgids[newngids++] = oldgids[i];
newpi = netfs_make_protid (user->po,
netfs_make_credential (newuids, newnuids,
newgids, newngids));
*newport = ports_get_right (newpi);
mutex_unlock (&user->po->np->lock);
*newporttype = MACH_MSG_TYPE_MAKE_SEND;
ports_port_deref (newpi);
return 0;
}
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