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/* Credential manipulation for NFS client
Copyright (C) 1995, 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 <hurd/netfs.h>
#include <string.h>
#include "nfs.h"
/* This lock must always be held when manipulating the reference count
on credential structures. */
static spin_lock_t cred_refcnt_lock = SPIN_LOCK_INITIALIZER;
/* Interpret CRED, returning newly malloced storage describing the
user identification references in UIDS, NUIDS, GIDS, and NGIDS.
See <hurd/libnetfs.h> for details. */
void
netfs_interpret_credential (struct netcred *cred, uid_t **uids,
int *nuids, uid_t **gids, int *ngids)
{
/* Who says C isn't APL? */
bcopy (cred->uids, *uids = malloc ((*nuids = cred->nuids) * sizeof (uid_t)),
cred->nuids * sizeof (uid_t));
bcopy (cred->gids, *gids = malloc ((*ngids = cred->ngids) * sizeof (uid_t)),
cred->ngids * sizeof (uid_t));
}
/* Return a new reference to CRED. See <hurd/libnetfs.h> for details. */
struct netcred *
netfs_copy_credential (struct netcred *cred)
{
spin_lock (&cred_refcnt_lock);
cred->refcnt++;
spin_unlock (&cred_refcnt_lock);
return cred;
}
/* Drop a reference to CRED. See <hurd/libnetfs.h> for details. */
void
netfs_drop_credential (struct netcred *cred)
{
spin_lock (&cred_refcnt_lock);
cred->refcnt--;
if (!cred->refcnt)
{
spin_unlock (&cred_refcnt_lock);
free (cred);
}
else
spin_unlock (&cred_refcnt_lock);
}
/* Make and return a new credential referring to the user identified
by UIDS, NUIDS, GIDS, and NGIDS. See <hurd/libnetfs.h> for
details. */
struct netcred *
netfs_make_credential (uid_t *uids,
int nuids,
uid_t *gids,
int ngids)
{
struct netcred *cred;
cred = malloc (sizeof (struct netcred)
+ nuids * sizeof (uid_t)
+ ngids * sizeof (uid_t));
cred->uids = (void *) cred + sizeof (struct netcred);
cred->gids = (void *) cred->uids + nuids * sizeof (uid_t);
cred->nuids = nuids;
cred->ngids = ngids;
cred->refcnt = 1;
bcopy (uids, cred->uids, nuids + sizeof (uid_t));
bcopy (gids, cred->gids, ngids + sizeof (uid_t));
return cred;
}
/* Return nonzero iff CRED contains user id UID. */
int
cred_has_uid (struct netcred *cred, uid_t uid)
{
int i;
for (i = 0; i < cred->nuids; i++)
if (cred->uids[i] == uid)
return 1;
return 0;
}
/* Return nonzero iff CRED contains group id GID. */
int
cred_has_gid (struct netcred *cred, gid_t gid)
{
int i;
for (i = 0; i < cred->ngids; i++)
if (cred->gids[i] == gid)
return 1;
return 0;
}
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