1/*-
2 * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
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
28#include <sys/param.h>
29
30#include <assert.h>
31#include <grp.h>
32#include <nsswitch.h>
33#include <stdlib.h>
34#include <string.h>
35
36#include "../debug.h"
37#include "group.h"
38
39static int group_marshal_func(struct group *, char *, size_t *);
40static int group_lookup_func(const char *, size_t, char **, size_t *);
41static void *group_mp_init_func(void);
42static int group_mp_lookup_func(char **, size_t *, void *);
43static void group_mp_destroy_func(void *);
44
45static int
46group_marshal_func(struct group *grp, char *buffer, size_t *buffer_size)
47{
48	struct group new_grp;
49	size_t desired_size, size, mem_size;
50	char *p, **mem;
51
52	TRACE_IN(group_marshal_func);
53	desired_size = ALIGNBYTES + sizeof(struct group) + sizeof(char *);
54
55	if (grp->gr_name != NULL)
56		desired_size += strlen(grp->gr_name) + 1;
57	if (grp->gr_passwd != NULL)
58		desired_size += strlen(grp->gr_passwd) + 1;
59
60	if (grp->gr_mem != NULL) {
61		mem_size = 0;
62		for (mem = grp->gr_mem; *mem; ++mem) {
63			desired_size += strlen(*mem) + 1;
64			++mem_size;
65		}
66
67		desired_size += ALIGNBYTES + (mem_size + 1) * sizeof(char *);
68	}
69
70	if ((desired_size > *buffer_size) || (buffer == NULL)) {
71		*buffer_size = desired_size;
72		TRACE_OUT(group_marshal_func);
73		return (NS_RETURN);
74	}
75
76	memcpy(&new_grp, grp, sizeof(struct group));
77	memset(buffer, 0, desired_size);
78
79	*buffer_size = desired_size;
80	p = buffer + sizeof(struct group) + sizeof(char *);
81	memcpy(buffer + sizeof(struct group), &p, sizeof(char *));
82	p = (char *)ALIGN(p);
83
84	if (new_grp.gr_name != NULL) {
85		size = strlen(new_grp.gr_name);
86		memcpy(p, new_grp.gr_name, size);
87		new_grp.gr_name = p;
88		p += size + 1;
89	}
90
91	if (new_grp.gr_passwd != NULL) {
92		size = strlen(new_grp.gr_passwd);
93		memcpy(p, new_grp.gr_passwd, size);
94		new_grp.gr_passwd = p;
95		p += size + 1;
96	}
97
98	if (new_grp.gr_mem != NULL) {
99		p = (char *)ALIGN(p);
100		memcpy(p, new_grp.gr_mem, sizeof(char *) * mem_size);
101		new_grp.gr_mem = (char **)p;
102		p += sizeof(char *) * (mem_size + 1);
103
104		for (mem = new_grp.gr_mem; *mem; ++mem) {
105			size = strlen(*mem);
106			memcpy(p, *mem, size);
107			*mem = p;
108			p += size + 1;
109		}
110	}
111
112	memcpy(buffer, &new_grp, sizeof(struct group));
113	TRACE_OUT(group_marshal_func);
114	return (NS_SUCCESS);
115}
116
117static int
118group_lookup_func(const char *key, size_t key_size, char **buffer,
119	size_t *buffer_size)
120{
121	enum nss_lookup_type lookup_type;
122	char	*name;
123	size_t	size;
124	gid_t	gid;
125
126	struct group *result;
127
128	TRACE_IN(group_lookup_func);
129	assert(buffer != NULL);
130	assert(buffer_size != NULL);
131
132	if (key_size < sizeof(enum nss_lookup_type)) {
133		TRACE_OUT(group_lookup_func);
134		return (NS_UNAVAIL);
135	}
136	memcpy(&lookup_type, key, sizeof(enum nss_lookup_type));
137
138	switch (lookup_type) {
139	case nss_lt_name:
140		size = key_size - sizeof(enum nss_lookup_type)	+ 1;
141		name = calloc(1, size);
142		assert(name != NULL);
143		memcpy(name, key + sizeof(enum nss_lookup_type), size - 1);
144		break;
145	case nss_lt_id:
146		if (key_size < sizeof(enum nss_lookup_type) +
147			sizeof(gid_t)) {
148			TRACE_OUT(passwd_lookup_func);
149			return (NS_UNAVAIL);
150		}
151
152		memcpy(&gid, key + sizeof(enum nss_lookup_type), sizeof(gid_t));
153		break;
154	default:
155		TRACE_OUT(group_lookup_func);
156		return (NS_UNAVAIL);
157	}
158
159	switch (lookup_type) {
160	case nss_lt_name:
161		TRACE_STR(name);
162		result = getgrnam(name);
163		free(name);
164		break;
165	case nss_lt_id:
166		result = getgrgid(gid);
167		break;
168	default:
169		/* SHOULD NOT BE REACHED */
170		break;
171	}
172
173	if (result != NULL) {
174		group_marshal_func(result, NULL, buffer_size);
175		*buffer = malloc(*buffer_size);
176		assert(*buffer != NULL);
177		group_marshal_func(result, *buffer, buffer_size);
178	}
179
180	TRACE_OUT(group_lookup_func);
181	return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
182}
183
184static void *
185group_mp_init_func(void)
186{
187	TRACE_IN(group_mp_init_func);
188	setgrent();
189	TRACE_OUT(group_mp_init_func);
190
191	return (NULL);
192}
193
194static int
195group_mp_lookup_func(char **buffer, size_t *buffer_size, void *mdata)
196{
197	struct group *result;
198
199	TRACE_IN(group_mp_lookup_func);
200	result = getgrent();
201	if (result != NULL) {
202		group_marshal_func(result, NULL, buffer_size);
203		*buffer = malloc(*buffer_size);
204		assert(*buffer != NULL);
205		group_marshal_func(result, *buffer, buffer_size);
206	}
207
208	TRACE_OUT(group_mp_lookup_func);
209	return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
210}
211
212static void
213group_mp_destroy_func(void *mdata)
214{
215	TRACE_IN(group_mp_destroy_func);
216	TRACE_OUT(group_mp_destroy_func);
217}
218
219struct agent *
220init_group_agent(void)
221{
222	struct common_agent	*retval;
223
224	TRACE_IN(init_group_agent);
225	retval = calloc(1, sizeof(*retval));
226	assert(retval != NULL);
227
228	retval->parent.name = strdup("group");
229	assert(retval->parent.name != NULL);
230
231	retval->parent.type = COMMON_AGENT;
232	retval->lookup_func = group_lookup_func;
233
234	TRACE_OUT(init_group_agent);
235	return ((struct agent *)retval);
236}
237
238struct agent *
239init_group_mp_agent(void)
240{
241	struct multipart_agent	*retval;
242
243	TRACE_IN(init_group_mp_agent);
244	retval = calloc(1,
245		sizeof(*retval));
246	assert(retval != NULL);
247
248	retval->parent.name = strdup("group");
249	retval->parent.type = MULTIPART_AGENT;
250	retval->mp_init_func = group_mp_init_func;
251	retval->mp_lookup_func = group_mp_lookup_func;
252	retval->mp_destroy_func = group_mp_destroy_func;
253	assert(retval->parent.name != NULL);
254
255	TRACE_OUT(init_group_mp_agent);
256	return ((struct agent *)retval);
257}
258