1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <cutils/multiuser.h>
18 #include <private/android_filesystem_config.h>
19
multiuser_get_user_id(uid_t uid)20 userid_t multiuser_get_user_id(uid_t uid) {
21 return uid / AID_USER_OFFSET;
22 }
23
multiuser_get_app_id(uid_t uid)24 appid_t multiuser_get_app_id(uid_t uid) {
25 return uid % AID_USER_OFFSET;
26 }
27
multiuser_get_uid(userid_t user_id,appid_t app_id)28 uid_t multiuser_get_uid(userid_t user_id, appid_t app_id) {
29 return (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET);
30 }
31
multiuser_get_cache_gid(userid_t user_id,appid_t app_id)32 gid_t multiuser_get_cache_gid(userid_t user_id, appid_t app_id) {
33 if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
34 return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_CACHE_GID_START);
35 } else {
36 return -1;
37 }
38 }
39
multiuser_get_ext_gid(userid_t user_id,appid_t app_id)40 gid_t multiuser_get_ext_gid(userid_t user_id, appid_t app_id) {
41 if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
42 return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_EXT_GID_START);
43 } else {
44 return -1;
45 }
46 }
47
multiuser_get_ext_cache_gid(userid_t user_id,appid_t app_id)48 gid_t multiuser_get_ext_cache_gid(userid_t user_id, appid_t app_id) {
49 if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
50 return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_EXT_CACHE_GID_START);
51 } else {
52 return -1;
53 }
54 }
55
multiuser_get_shared_gid(userid_t,appid_t app_id)56 gid_t multiuser_get_shared_gid(userid_t, appid_t app_id) {
57 if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
58 return (app_id - AID_APP_START) + AID_SHARED_GID_START;
59 } else if (app_id >= AID_ROOT && app_id <= AID_APP_START) {
60 return app_id;
61 } else {
62 return -1;
63 }
64 }
65
multiuser_get_shared_app_gid(uid_t uid)66 gid_t multiuser_get_shared_app_gid(uid_t uid) {
67 return multiuser_get_shared_gid(multiuser_get_user_id(uid), multiuser_get_app_id(uid));
68 }
69