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
34int 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
43char* 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
53char* 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