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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