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
82
83int
84__nss_compat_getgrnam_r(void *retval, void *mdata, va_list ap)
85{
86	int (*fn)(const char *, struct group *, char *, size_t, int *);
87	const char	*name;
88	struct group	*grp;
89	char		*buffer;
90	int		*errnop;
91	size_t		 bufsize;
92	enum nss_status	 status;
93
94	fn = mdata;
95	name = va_arg(ap, const char *);
96	grp = va_arg(ap, struct group *);
97	buffer = va_arg(ap, char *);
98	bufsize = va_arg(ap, size_t);
99	errnop = va_arg(ap, int *);
100	status = fn(name, grp, buffer, bufsize, errnop);
101	status = __nss_compat_result(status, *errnop);
102	if (status == NS_SUCCESS)
103		*(struct group **)retval = grp;
104	return (status);
105}
106
107
108int
109__nss_compat_getgrgid_r(void *retval, void *mdata, va_list ap)
110{
111	int (*fn)(gid_t, struct group *, char *, size_t, int *);
112	gid_t		 gid;
113	struct group	*grp;
114	char		*buffer;
115	int		*errnop;
116	size_t		 bufsize;
117	enum nss_status	 status;
118
119	fn = mdata;
120	gid = va_arg(ap, gid_t);
121	grp = va_arg(ap, struct group *);
122	buffer = va_arg(ap, char *);
123	bufsize = va_arg(ap, size_t);
124	errnop = va_arg(ap, int *);
125	status = fn(gid, grp, buffer, bufsize, errnop);
126	status = __nss_compat_result(status, *errnop);
127	if (status == NS_SUCCESS)
128		*(struct group **)retval = grp;
129	return (status);
130}
131
132
133int
134__nss_compat_getgrent_r(void *retval, void *mdata, va_list ap)
135{
136	int (*fn)(struct group *, char *, size_t, int *);
137	struct group	*grp;
138	char		*buffer;
139	int		*errnop;
140	size_t		 bufsize;
141	enum nss_status	 status;
142
143	if (CHECK_TERMINATOR(group))
144		return (NS_NOTFOUND);
145	fn = mdata;
146	grp = va_arg(ap, struct group *);
147	buffer = va_arg(ap, char *);
148	bufsize = va_arg(ap, size_t);
149	errnop = va_arg(ap, int *);
150	status = fn(grp, buffer, bufsize, errnop);
151	status = __nss_compat_result(status, *errnop);
152	if (status == NS_SUCCESS)
153		*(struct group **)retval = grp;
154	else if (status != NS_RETURN)
155		SET_TERMINATOR(group, &terminator);
156	return (status);
157}
158
159
160int
161__nss_compat_setgrent(void *retval, void *mdata, va_list ap)
162{
163
164	SET_TERMINATOR(group, NULL);
165	((int (*)(void))mdata)();
166	return (NS_UNAVAIL);
167}
168
169
170int
171__nss_compat_endgrent(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
180
181DECLARE_TERMINATOR(passwd);
182
183
184int
185__nss_compat_getpwnam_r(void *retval, void *mdata, va_list ap)
186{
187	int (*fn)(const char *, struct passwd *, char *, size_t, int *);
188	const char	*name;
189	struct passwd	*pwd;
190	char		*buffer;
191	int		*errnop;
192	size_t		 bufsize;
193	enum nss_status	 status;
194
195	fn = mdata;
196	name = va_arg(ap, const char *);
197	pwd = va_arg(ap, struct passwd *);
198	buffer = va_arg(ap, char *);
199	bufsize = va_arg(ap, size_t);
200	errnop = va_arg(ap, int *);
201	status = fn(name, pwd, buffer, bufsize, errnop);
202	status = __nss_compat_result(status, *errnop);
203	if (status == NS_SUCCESS)
204		*(struct passwd **)retval = pwd;
205	return (status);
206}
207
208
209int
210__nss_compat_getpwuid_r(void *retval, void *mdata, va_list ap)
211{
212	int (*fn)(uid_t, struct passwd *, char *, size_t, int *);
213	uid_t		 uid;
214	struct passwd	*pwd;
215	char		*buffer;
216	int		*errnop;
217	size_t		 bufsize;
218	enum nss_status	 status;
219
220	fn = mdata;
221	uid = va_arg(ap, uid_t);
222	pwd = va_arg(ap, struct passwd *);
223	buffer = va_arg(ap, char *);
224	bufsize = va_arg(ap, size_t);
225	errnop = va_arg(ap, int *);
226	status = fn(uid, pwd, buffer, bufsize, errnop);
227	status = __nss_compat_result(status, *errnop);
228	if (status == NS_SUCCESS)
229		*(struct passwd **)retval = pwd;
230	return (status);
231}
232
233
234int
235__nss_compat_getpwent_r(void *retval, void *mdata, va_list ap)
236{
237	int (*fn)(struct passwd *, char *, size_t, int *);
238	struct passwd	*pwd;
239	char		*buffer;
240	int		*errnop;
241	size_t		 bufsize;
242	enum nss_status	 status;
243
244	if (CHECK_TERMINATOR(passwd))
245		return (NS_NOTFOUND);
246	fn = mdata;
247	pwd = va_arg(ap, struct passwd *);
248	buffer = va_arg(ap, char *);
249	bufsize = va_arg(ap, size_t);
250	errnop = va_arg(ap, int *);
251	status = fn(pwd, buffer, bufsize, errnop);
252	status = __nss_compat_result(status, *errnop);
253	if (status == NS_SUCCESS)
254		*(struct passwd **)retval = pwd;
255	else if (status != NS_RETURN)
256		SET_TERMINATOR(passwd, &terminator);
257	return (status);
258}
259
260
261int
262__nss_compat_setpwent(void *retval, void *mdata, va_list ap)
263{
264
265	SET_TERMINATOR(passwd, NULL);
266	((int (*)(void))mdata)();
267	return (NS_UNAVAIL);
268}
269
270
271int
272__nss_compat_endpwent(void *retval, void *mdata, va_list ap)
273{
274
275	SET_TERMINATOR(passwd, NULL);
276	((int (*)(void))mdata)();
277	return (NS_UNAVAIL);
278}
279