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.
16 * if bufsize is > 0 char *buffer cannot be set to NULL.
17 * If idname is not NULL it is written on the static
18 * allocated buffer (and a pointer to it is returned).
19 * if idname is NULL, id as string is written to the static
20 * allocated buffer and NULL is returned.
21 * if bufsize is = 0 char *buffer can be set to NULL.
22 * If idname exists a pointer to it is returned,
23 * else NULL is returned.
24 * if bufsize is < 0 char *buffer can be set to NULL.
25 * If idname exists a pointer to it is returned,
26 * else an error message is printed and the program exits.
29 /* internal function for bb_getpwuid and bb_getgrgid */
30 static char * bb_getug(char *buffer, char *idname, long id, int bufsize, char prefix)
35 return safe_strncpy(buffer, idname, bufsize);
37 snprintf(buffer, bufsize, "%ld", id);
38 } else if (bufsize < 0 && !idname) {
39 bb_error_msg_and_die("unknown %cid %ld", prefix, id);
44 /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
47 * if bufsize is > 0 char *group cannot be set to NULL.
48 * On success groupname is written on static allocated buffer
49 * group (and a pointer to it is returned).
50 * On failure gid as string is written to static allocated
51 * buffer group and NULL is returned.
52 * if bufsize is = 0 char *group can be set to NULL.
53 * On success groupname is returned.
54 * On failure NULL is returned.
55 * if bufsize is < 0 char *group can be set to NULL.
56 * On success groupname is returned.
57 * On failure an error message is printed and
61 /* gets a groupname given a gid */
62 char * bb_getgrgid(char *group, long gid, int bufsize)
64 struct group *mygroup = getgrgid(gid);
66 return bb_getug(group, (mygroup) ?
67 mygroup->gr_name : (char *)mygroup, gid, bufsize, 'g');
70 /* returns a gid given a group name */
71 long bb_xgetgrnam(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 bb_xgetpwnam(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 (*__bb_getxxnam)(const char *))
125 r = bb_strtoul(s, NULL, 10);
127 r = __bb_getxxnam(s);