1/*-
2 * Copyright (c) 1999-2001, 2008 Robert N. M. Watson
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 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26/*
27 * Support functionality for the POSIX.1e ACL interface
28 * These calls are intended only to be called within the library.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: releng/10.3/lib/libc/posix1e/acl_id_to_name.c 209147 2010-06-14 02:26:13Z kientzle $");
33
34#include <sys/types.h>
35#include "namespace.h"
36#include <sys/acl.h>
37#include "un-namespace.h"
38#include <errno.h>
39#include <grp.h>
40#include <pwd.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <assert.h>
45
46#include "acl_support.h"
47
48/*
49 * Given a uid/gid, return a username/groupname for the text form of an ACL.
50 * Note that we truncate user and group names, rather than error out, as
51 * this is consistent with other tools manipulating user and group names.
52 * XXX NOT THREAD SAFE, RELIES ON GETPWUID, GETGRGID
53 * XXX USES *PW* AND *GR* WHICH ARE STATEFUL AND THEREFORE THIS ROUTINE
54 * MAY HAVE SIDE-EFFECTS
55 */
56int
57_posix1e_acl_id_to_name(acl_tag_t tag, uid_t id, ssize_t buf_len, char *buf,
58    int flags)
59{
60	struct group	*g;
61	struct passwd	*p;
62	int	i;
63
64	switch(tag) {
65	case ACL_USER:
66		if (flags & ACL_TEXT_NUMERIC_IDS)
67			p = NULL;
68		else
69			p = getpwuid(id);
70		if (!p)
71			i = snprintf(buf, buf_len, "%d", id);
72		else
73			i = snprintf(buf, buf_len, "%s", p->pw_name);
74
75		if (i < 0) {
76			errno = ENOMEM;
77			return (-1);
78		}
79		return (0);
80
81	case ACL_GROUP:
82		if (flags & ACL_TEXT_NUMERIC_IDS)
83			g = NULL;
84		else
85			g = getgrgid(id);
86		if (g == NULL)
87			i = snprintf(buf, buf_len, "%d", id);
88		else
89			i = snprintf(buf, buf_len, "%s", g->gr_name);
90
91		if (i < 0) {
92			errno = ENOMEM;
93			return (-1);
94		}
95		return (0);
96
97	default:
98		return (EINVAL);
99	}
100}
101