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