1 /* vi: set sw=4 ts=4: */
3 * password utility routines.
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
12 #define assert(x) ((void)0)
15 * if bufsize is > 0 char *buffer cannot be set to NULL.
16 * If idname is not NULL it is written on the static
17 * allocated buffer (and a pointer to it is returned).
18 * if idname is NULL, id as string is written to the static
19 * allocated buffer and NULL is returned.
20 * if bufsize is = 0 char *buffer can be set to NULL.
21 * If idname exists a pointer to it is returned,
22 * else NULL is returned.
23 * if bufsize is < 0 char *buffer can be set to NULL.
24 * If idname exists a pointer to it is returned,
25 * else an error message is printed and the program exits.
28 /* internal function for bb_getpwuid and bb_getgrgid */
29 static char* bb_getug(char *buffer, char *idname, long id, int bufsize, char prefix)
32 assert(buffer != NULL);
34 return safe_strncpy(buffer, idname, bufsize);
36 snprintf(buffer, bufsize, "%ld", id);
37 } else if (bufsize < 0 && !idname) {
38 bb_error_msg_and_die("unknown %cid %ld", prefix, id);
43 /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
46 * if bufsize is > 0 char *group cannot be set to NULL.
47 * On success groupname is written on static allocated buffer
48 * group (and a pointer to it is returned).
49 * On failure gid as string is written to static allocated
50 * buffer group and NULL is returned.
51 * if bufsize is = 0 char *group can be set to NULL.
52 * On success groupname is returned.
53 * On failure NULL is returned.
54 * if bufsize is < 0 char *group can be set to NULL.
55 * On success groupname is returned.
56 * On failure an error message is printed and
60 /* gets a groupname given a gid */
61 char* bb_getgrgid(char *group, long gid, int bufsize)
63 struct group *mygroup = getgrgid(gid);
65 return bb_getug(group,
66 mygroup ? mygroup->gr_name : (char *)mygroup,
70 /* returns a gid given a group name */
71 long xgroup2gid(const char *name)
73 struct group *mygroup;
75 mygroup = getgrnam(name);
77 bb_error_msg_and_die("unknown group name: %s", name);
79 return mygroup->gr_gid;
82 /* returns a uid given a username */
83 long xuname2uid(const char *name)
85 struct passwd *myuser;
87 myuser = getpwnam(name);
89 bb_error_msg_and_die("unknown user name: %s", name);
91 return myuser->pw_uid;
94 /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
97 * if bufsize is > 0 char *name cannot be set to NULL.
98 * On success username is written on the static allocated
99 * buffer name (and a pointer to it is returned).
100 * On failure uid as string is written to the static
101 * allocated buffer name and NULL is returned.
102 * if bufsize is = 0 char *name can be set to NULL.
103 * On success username is returned.
104 * On failure NULL is returned.
105 * if bufsize is < 0 char *name can be set to NULL
106 * On success username is returned.
107 * On failure an error message is printed and
111 /* gets a username given a uid */
112 char* bb_getpwuid(char *name, long uid, int bufsize)
114 struct passwd *myuser = getpwuid(uid);
116 return bb_getug(name, myuser ? myuser->pw_name : (char *)myuser,
120 unsigned long get_ug_id(const char *s,
121 long (*xname2id)(const char *))
125 r = bb_strtoul(s, NULL, 10);