1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/* 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 "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)
bzero (u, 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 appropiate 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, the 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;
err = idvec_merge_implied_gids (&imp_gids, &uids);
if (! err)
{
/* Now remove any gids we already know about from IMP_GIDS. For gids
that weren't in the appropiate 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;
}
|
