1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2003 Networks Associates Technology, Inc.
5 * All rights reserved.
6 *
7 * This software was developed for the FreeBSD Project by
8 * Jacques A. Vidrine, Safeport Network Services, and Network
9 * Associates Laboratories, the Security Research Division of Network
10 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
11 * ("CBOSS"), as part of the DARPA CHATS research program.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * Compatibility shims for the GNU C Library-style nsswitch interface.
35 */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39#include "namespace.h"
40#include <sys/param.h>
41#include <errno.h>
42#include <nss.h>
43#include <pthread.h>
44#include <pthread_np.h>
45#include "un-namespace.h"
46#include "libc_private.h"
47
48
49struct group;
50struct passwd;
51
52static int	terminator;
53
54#define DECLARE_TERMINATOR(x)					\
55static pthread_key_t	 _term_key_##x;				\
56static void							\
57_term_create_##x(void)						\
58{								\
59	(void)_pthread_key_create(&_term_key_##x, NULL);	\
60}								\
61static void		*_term_main_##x;			\
62static pthread_once_t	 _term_once_##x = PTHREAD_ONCE_INIT
63
64#define SET_TERMINATOR(x, y)						\
65do {									\
66	if (!__isthreaded || _pthread_main_np())			\
67		_term_main_##x = (y);					\
68	else {								\
69		(void)_pthread_once(&_term_once_##x, _term_create_##x);	\
70		(void)_pthread_setspecific(_term_key_##x, y);		\
71	}								\
72} while (0)
73
74#define CHECK_TERMINATOR(x)					\
75(!__isthreaded || _pthread_main_np() ?				\
76    (_term_main_##x) :						\
77    ((void)_pthread_once(&_term_once_##x, _term_create_##x),	\
78    _pthread_getspecific(_term_key_##x)))
79
80
81
82DECLARE_TERMINATOR(group);
83
84int __nss_compat_getgrnam_r(void *retval, void *mdata, va_list ap);
85int __nss_compat_getgrgid_r(void *retval, void *mdata, va_list ap);
86int __nss_compat_getgrent_r(void *retval, void *mdata, va_list ap);
87int __nss_compat_setgrent(void *retval, void *mdata, va_list ap);
88int __nss_compat_endgrent(void *retval, void *mdata, va_list ap);
89int __nss_compat_getpwnam_r(void *retval, void *mdata, va_list ap);
90int __nss_compat_getpwuid_r(void *retval, void *mdata, va_list ap);
91int __nss_compat_getpwent_r(void *retval, void *mdata, va_list ap);
92int __nss_compat_setpwent(void *retval, void *mdata, va_list ap);
93int __nss_compat_endpwent(void *retval, void *mdata, va_list ap);
94
95int
96__nss_compat_getgrnam_r(void *retval, void *mdata, va_list ap)
97{
98	int (*fn)(const char *, struct group *, char *, size_t, int *);
99	const char	*name;
100	struct group	*grp;
101	char		*buffer;
102	int		*errnop, ns_status;
103	size_t		 bufsize;
104	enum nss_status	 nss_status;
105
106	fn = mdata;
107	name = va_arg(ap, const char *);
108	grp = va_arg(ap, struct group *);
109	buffer = va_arg(ap, char *);
110	bufsize = va_arg(ap, size_t);
111	errnop = va_arg(ap, int *);
112	nss_status = fn(name, grp, buffer, bufsize, errnop);
113	ns_status = __nss_compat_result(nss_status, *errnop);
114	if (ns_status == NS_SUCCESS)
115		*(struct group **)retval = grp;
116	return (ns_status);
117}
118
119
120int
121__nss_compat_getgrgid_r(void *retval, void *mdata, va_list ap)
122{
123	int (*fn)(gid_t, struct group *, char *, size_t, int *);
124	gid_t		 gid;
125	struct group	*grp;
126	char		*buffer;
127	int		*errnop, ns_status;
128	size_t		 bufsize;
129	enum nss_status	 nss_status;
130
131	fn = mdata;
132	gid = va_arg(ap, gid_t);
133	grp = va_arg(ap, struct group *);
134	buffer = va_arg(ap, char *);
135	bufsize = va_arg(ap, size_t);
136	errnop = va_arg(ap, int *);
137	nss_status = fn(gid, grp, buffer, bufsize, errnop);
138	ns_status = __nss_compat_result(nss_status, *errnop);
139	if (ns_status == NS_SUCCESS)
140		*(struct group **)retval = grp;
141	return (ns_status);
142}
143
144
145int
146__nss_compat_getgrent_r(void *retval, void *mdata, va_list ap)
147{
148	int (*fn)(struct group *, char *, size_t, int *);
149	struct group	*grp;
150	char		*buffer;
151	int		*errnop, ns_status;
152	size_t		 bufsize;
153	enum nss_status	 nss_status;
154
155	if (CHECK_TERMINATOR(group))
156		return (NS_NOTFOUND);
157	fn = mdata;
158	grp = va_arg(ap, struct group *);
159	buffer = va_arg(ap, char *);
160	bufsize = va_arg(ap, size_t);
161	errnop = va_arg(ap, int *);
162	nss_status = fn(grp, buffer, bufsize, errnop);
163	ns_status = __nss_compat_result(nss_status, *errnop);
164	if (ns_status == NS_SUCCESS)
165		*(struct group **)retval = grp;
166	else if (ns_status != NS_RETURN)
167		SET_TERMINATOR(group, &terminator);
168	return (ns_status);
169}
170
171
172int
173__nss_compat_setgrent(void *retval, void *mdata, va_list ap)
174{
175
176	SET_TERMINATOR(group, NULL);
177	((int (*)(void))mdata)();
178	return (NS_UNAVAIL);
179}
180
181
182int
183__nss_compat_endgrent(void *retval, void *mdata, va_list ap)
184{
185
186	SET_TERMINATOR(group, NULL);
187	((int (*)(void))mdata)();
188	return (NS_UNAVAIL);
189}
190
191
192
193DECLARE_TERMINATOR(passwd);
194
195
196int
197__nss_compat_getpwnam_r(void *retval, void *mdata, va_list ap)
198{
199	int (*fn)(const char *, struct passwd *, char *, size_t, int *);
200	const char	*name;
201	struct passwd	*pwd;
202	char		*buffer;
203	int		*errnop, ns_status;
204	size_t		 bufsize;
205	enum nss_status	 nss_status;
206
207	fn = mdata;
208	name = va_arg(ap, const char *);
209	pwd = va_arg(ap, struct passwd *);
210	buffer = va_arg(ap, char *);
211	bufsize = va_arg(ap, size_t);
212	errnop = va_arg(ap, int *);
213	nss_status = fn(name, pwd, buffer, bufsize, errnop);
214	ns_status = __nss_compat_result(nss_status, *errnop);
215	if (ns_status == NS_SUCCESS)
216		*(struct passwd **)retval = pwd;
217	return (ns_status);
218}
219
220
221int
222__nss_compat_getpwuid_r(void *retval, void *mdata, va_list ap)
223{
224	int (*fn)(uid_t, struct passwd *, char *, size_t, int *);
225	uid_t		 uid;
226	struct passwd	*pwd;
227	char		*buffer;
228	int		*errnop, ns_status;
229	size_t		 bufsize;
230	enum nss_status	 nss_status;
231
232	fn = mdata;
233	uid = va_arg(ap, uid_t);
234	pwd = va_arg(ap, struct passwd *);
235	buffer = va_arg(ap, char *);
236	bufsize = va_arg(ap, size_t);
237	errnop = va_arg(ap, int *);
238	nss_status = fn(uid, pwd, buffer, bufsize, errnop);
239	ns_status = __nss_compat_result(nss_status, *errnop);
240	if (ns_status == NS_SUCCESS)
241		*(struct passwd **)retval = pwd;
242	return (ns_status);
243}
244
245
246int
247__nss_compat_getpwent_r(void *retval, void *mdata, va_list ap)
248{
249	int (*fn)(struct passwd *, char *, size_t, int *);
250	struct passwd	*pwd;
251	char		*buffer;
252	int		*errnop, ns_status;
253	size_t		 bufsize;
254	enum nss_status	 nss_status;
255
256	if (CHECK_TERMINATOR(passwd))
257		return (NS_NOTFOUND);
258	fn = mdata;
259	pwd = va_arg(ap, struct passwd *);
260	buffer = va_arg(ap, char *);
261	bufsize = va_arg(ap, size_t);
262	errnop = va_arg(ap, int *);
263	nss_status = fn(pwd, buffer, bufsize, errnop);
264	ns_status = __nss_compat_result(nss_status, *errnop);
265	if (ns_status == NS_SUCCESS)
266		*(struct passwd **)retval = pwd;
267	else if (ns_status != NS_RETURN)
268		SET_TERMINATOR(passwd, &terminator);
269	return (ns_status);
270}
271
272
273int
274__nss_compat_setpwent(void *retval, void *mdata, va_list ap)
275{
276
277	SET_TERMINATOR(passwd, NULL);
278	((int (*)(void))mdata)();
279	return (NS_UNAVAIL);
280}
281
282
283int
284__nss_compat_endpwent(void *retval, void *mdata, va_list ap)
285{
286
287	SET_TERMINATOR(passwd, NULL);
288	((int (*)(void))mdata)();
289	return (NS_UNAVAIL);
290}
291