1 /*
2 * Copyright (C) 2014, The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <grp.h>
30 #include <pwd.h>
31 #include <stdio.h>
32 #include <sys/types.h>
33
uid_from_user(const char * name,uid_t * uid)34 int uid_from_user(const char* name, uid_t* uid) {
35 struct passwd* pw = getpwnam(name);
36 if (pw == NULL) {
37 return -1;
38 }
39 *uid = pw->pw_uid;
40 return 0;
41 }
42
group_from_gid(gid_t gid,int noname)43 char* group_from_gid(gid_t gid, int noname) {
44 struct group* g = getgrgid(gid);
45 if (g == NULL) {
46 static char buf[32];
47 snprintf(buf, sizeof(buf), "%lu", (long) gid);
48 return noname ? NULL : buf;
49 }
50 return g->gr_name;
51 }
52
user_from_uid(uid_t uid,int noname)53 char* user_from_uid(uid_t uid, int noname) {
54 struct passwd* pw = getpwuid(uid);
55 if (pw == NULL) {
56 static char buf[32];
57 snprintf(buf, sizeof(buf), "%lu", (long) uid);
58 return noname ? NULL : buf;
59 }
60 return pw->pw_name;
61 }
62