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/* Frob user and group ids
Copyright (C) 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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 <stdlib.h>
#include <string.h>
#include "idvec.h"
#include "ugids.h"
/* Return a new ugids structure, or 0 if an allocation error occurs. */
struct ugids *
make_ugids ()
{
struct ugids *u = malloc (sizeof (struct ugids));
if (u)
memset (u, 0, sizeof *u);
return u;
}
/* Add a new uid to UGIDS. If AVAIL is true, it's added to the avail uids
instead of the effective ones. */
error_t
ugids_add_uid (struct ugids *ugids, uid_t uid, int avail)
{
return idvec_add_new (avail ? &ugids->avail_uids : &ugids->eff_uids, uid);
}
/* Add a new gid to UGIDS. If AVAIL is true, it's added to the avail gids
instead of the effective ones. */
error_t
ugids_add_gid (struct ugids *ugids, gid_t gid, int avail)
{
error_t err =
idvec_add_new (avail ? &ugids->avail_gids : &ugids->eff_gids, gid);
if (! err)
/* Since this gid is now explicit, remove it from the appropriate implied
set. */
idvec_remove (avail ? &ugids->imp_avail_gids : &ugids->imp_eff_gids,
0, gid);
return err;
}
/* Add UID to UGIDS, plus any gids to which that user belongs. If AVAIL is
true, they are added to the avail gids instead of the effective ones. */
error_t
ugids_add_user (struct ugids *ugids, uid_t uid, int avail)
{
error_t err;
struct idvec imp_gids = IDVEC_INIT;
uid_t uids_ids[] = { uid };
struct idvec uids = { uids_ids, 1 };
struct idvec *gids = avail ? &ugids->avail_gids : &ugids->eff_gids;
idvec_merge_implied_gids (&imp_gids, &uids);
/* Now remove any gids we already know about from IMP_GIDS. For gids
that weren't in the appropriate implied set before, this will
ensure that they remain out after we merge IMP_GIDS into it, and
ones that *were*, they will remain so. */
idvec_subtract (&imp_gids, gids);
/* Try to add UID. */
err = idvec_add_new (avail ? &ugids->avail_uids : &ugids->eff_uids, uid);
if (! err)
/* Now that we've added UID, we can add appropriate implied gids.
[If this fails, UGIDS will be an inconsistent state, but things
are probably fucked anyhow] */
err =
idvec_merge (avail ? &ugids->avail_gids : &ugids->eff_gids,
&imp_gids);
if (! err)
err = idvec_merge ((avail
? &ugids->imp_avail_gids
: &ugids->imp_eff_gids),
&imp_gids);
idvec_fini (&imp_gids);
return err;
}
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