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)
14 /* internal function for bb_getpwuid and bb_getgrgid */
15 /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
18 * bufsize > 0: If idname is not NULL it is copied to buffer,
19 * and buffer is returned. Else id as string is written
20 * to buffer, and NULL is returned.
22 * bufsize == 0: idname is returned.
24 * bufsize < 0: If idname is not NULL it is returned.
25 * Else an error message is printed and the program exits.
27 static char* bb_getug(char *buffer, int bufsize, char *idname, long id, char prefix)
30 assert(buffer != NULL);
32 return safe_strncpy(buffer, idname, bufsize);
34 snprintf(buffer, bufsize, "%ld", id);
35 } else if (bufsize < 0 && !idname) {
36 bb_error_msg_and_die("unknown %cid %ld", prefix, id);
41 /* bb_getpwuid, bb_getgrgid:
42 * bb_getXXXid(buf, bufsz, id) - copy user/group name or id
43 * as a string to buf, return user/group name or NULL
44 * bb_getXXXid(NULL, 0, id) - return user/group name or NULL
45 * bb_getXXXid(NULL, -1, id) - return user/group name or exit
47 /* gets a username given a uid */
48 char* bb_getpwuid(char *name, int bufsize, long uid)
50 struct passwd *myuser = getpwuid(uid);
52 return bb_getug(name, bufsize,
53 (myuser ? myuser->pw_name : (char*)myuser),
56 /* gets a groupname given a gid */
57 char* bb_getgrgid(char *group, int bufsize, long gid)
59 struct group *mygroup = getgrgid(gid);
61 return bb_getug(group, bufsize,
62 (mygroup ? mygroup->gr_name : (char*)mygroup),
66 /* returns a gid given a group name */
67 long xgroup2gid(const char *name)
69 struct group *mygroup;
71 mygroup = getgrnam(name);
73 bb_error_msg_and_die("unknown group name: %s", name);
75 return mygroup->gr_gid;
78 /* returns a uid given a username */
79 long xuname2uid(const char *name)
81 struct passwd *myuser;
83 myuser = getpwnam(name);
85 bb_error_msg_and_die("unknown user name: %s", name);
87 return myuser->pw_uid;
90 unsigned long get_ug_id(const char *s,
91 long (*xname2id)(const char *))
95 r = bb_strtoul(s, NULL, 10);