busybox/libbb/bb_pwd.c

/* vi: set sw=4 ts=4: */
/*
 * password utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include "libbb.h"

#define assert(x) ((void)0)

/* internal function for bb_getpwuid and bb_getgrgid */
/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
 * flexible:
 *
 * bufsize > 0:      If idname is not NULL it is copied to buffer,
 *                   and buffer is returned. Else id as string is written
 *                   to buffer, and NULL is returned.
 *
 * bufsize == 0:     idname is returned.
 *
 * bufsize < 0:      If idname is not NULL it is returned.
 *                   Else an error message is printed and the program exits.
 */
static char* bb_getug(char *buffer, int bufsize, char *idname, long id, char prefix)
{
	if (bufsize > 0) {
		assert(buffer != NULL);
		if (idname) {
			return safe_strncpy(buffer, idname, bufsize);
		}
		snprintf(buffer, bufsize, "%ld", id);
	} else if (bufsize < 0 && !idname) {
		bb_error_msg_and_die("unknown %cid %ld", prefix, id);
	}
	return idname;
}

/* bb_getpwuid, bb_getgrgid:
 * bb_getXXXid(buf, bufsz, id) - copy user/group name or id
 *               as a string to buf, return user/group name or NULL
 * bb_getXXXid(NULL, 0, id) - return user/group name or NULL
 * bb_getXXXid(NULL, -1, id) - return user/group name or exit
 */
/* gets a username given a uid */
char* FAST_FUNC bb_getpwuid(char *name, int bufsize, long uid)
{
	struct passwd *myuser = getpwuid(uid);

	return bb_getug(name, bufsize,
			(myuser ? myuser->pw_name : (char*)myuser),
			uid, 'u');
}
/* gets a groupname given a gid */
char* FAST_FUNC bb_getgrgid(char *group, int bufsize, long gid)
{
	struct group *mygroup = getgrgid(gid);

	return bb_getug(group, bufsize,
			(mygroup ? mygroup->gr_name : (char*)mygroup),
			gid, 'g');
}

/* returns a gid given a group name */
long FAST_FUNC xgroup2gid(const char *name)
{
	struct group *mygroup;

	mygroup = getgrnam(name);
	if (mygroup == NULL)
		bb_error_msg_and_die("unknown group name: %s", name);

	return mygroup->gr_gid;
}

/* returns a uid given a username */
long FAST_FUNC xuname2uid(const char *name)
{
	struct passwd *myuser;

	myuser = getpwnam(name);
	if (myuser == NULL)
		bb_error_msg_and_die("unknown user %s", name);

	return myuser->pw_uid;
}

unsigned long FAST_FUNC get_ug_id(const char *s,
		long FAST_FUNC (*xname2id)(const char *))
{
	unsigned long r;

	r = bb_strtoul(s, NULL, 10);
	if (errno)
		return xname2id(s);
	return r;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* password utility routines.
4	*
5	* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6	*
7	* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
8	*/
9
10	#include "libbb.h"
11
12	#define assert(x) ((void)0)
13
14	/* internal function for bb_getpwuid and bb_getgrgid */
15	/* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
16	* flexible:
17	*
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.
21	*
22	* bufsize == 0: idname is returned.
23	*
24	* bufsize < 0: If idname is not NULL it is returned.
25	* Else an error message is printed and the program exits.
26	*/
27	static char* bb_getug(char buffer, int bufsize, char idname, long id, char prefix)
28	{
29	if (bufsize > 0) {
30	assert(buffer != NULL);
31	if (idname) {
32	return safe_strncpy(buffer, idname, bufsize);
33	}
34	snprintf(buffer, bufsize, "%ld", id);
35	} else if (bufsize < 0 && !idname) {
36	bb_error_msg_and_die("unknown %cid %ld", prefix, id);
37	}
38	return idname;
39	}
40
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
46	*/
47	/* gets a username given a uid */
48	char* FAST_FUNC bb_getpwuid(char *name, int bufsize, long uid)
49	{
50	struct passwd *myuser = getpwuid(uid);
51
52	return bb_getug(name, bufsize,
53	(myuser ? myuser->pw_name : (char*)myuser),
54	uid, 'u');
55	}
56	/* gets a groupname given a gid */
57	char* FAST_FUNC bb_getgrgid(char *group, int bufsize, long gid)
58	{
59	struct group *mygroup = getgrgid(gid);
60
61	return bb_getug(group, bufsize,
62	(mygroup ? mygroup->gr_name : (char*)mygroup),
63	gid, 'g');
64	}
65
66	/* returns a gid given a group name */
67	long FAST_FUNC xgroup2gid(const char *name)
68	{
69	struct group *mygroup;
70
71	mygroup = getgrnam(name);
72	if (mygroup == NULL)
73	bb_error_msg_and_die("unknown group name: %s", name);
74
75	return mygroup->gr_gid;
76	}
77
78	/* returns a uid given a username */
79	long FAST_FUNC xuname2uid(const char *name)
80	{
81	struct passwd *myuser;
82
83	myuser = getpwnam(name);
84	if (myuser == NULL)
85	bb_error_msg_and_die("unknown user %s", name);
86
87	return myuser->pw_uid;
88	}
89
90	unsigned long FAST_FUNC get_ug_id(const char *s,
91	long FAST_FUNC (xname2id)(const char ))
92	{
93	unsigned long r;
94
95	r = bb_strtoul(s, NULL, 10);
96	if (errno)
97	return xname2id(s);
98	return r;
99	}