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[FreeBSD/releng/7.2.git] / usr.sbin / nscd / agents / services.c
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/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/types.h>
33 #include <assert.h>
34 #include <nsswitch.h>
35 #include <netdb.h>
36 #include <string.h>
37 #include <stdlib.h>
38 #include "../debug.h"
39 #include "services.h"
40
41 static int services_marshal_func(struct servent *, char *, size_t *);
42 static int services_lookup_func(const char *, size_t, char **, size_t *);
43 static void *services_mp_init_func();
44 static int services_mp_lookup_func(char **, size_t *, void *);
45 static void services_mp_destroy_func(void *);
46
47 static int
48 services_marshal_func(struct servent *serv, char *buffer, size_t *buffer_size)
49 {
50         struct servent  new_serv;
51         size_t  desired_size;
52         char    **alias;
53         char    *p;
54         size_t  size;
55         size_t  aliases_size;
56
57         TRACE_IN(services_marshal_func);
58         desired_size = ALIGNBYTES + sizeof(struct servent) + sizeof(char *);
59         if (serv->s_name != NULL)
60                 desired_size += strlen(serv->s_name) + 1;
61         if (serv->s_proto != NULL)
62                 desired_size += strlen(serv->s_proto) + 1;
63
64         aliases_size = 0;
65         if (serv->s_aliases != NULL) {
66                 for (alias = serv->s_aliases; *alias; ++alias) {
67                         desired_size += strlen(*alias) + 1;
68                         ++aliases_size;
69                 }
70
71                 desired_size += ALIGNBYTES + sizeof(char *) *
72                     (aliases_size + 1);
73         }
74
75         if ((*buffer_size < desired_size) || (buffer == NULL)) {
76                 *buffer_size = desired_size;
77                 TRACE_OUT(services_marshal_func);
78                 return (NS_RETURN);
79         }
80
81         memcpy(&new_serv, serv, sizeof(struct servent));
82         memset(buffer, 0, desired_size);
83
84         *buffer_size = desired_size;
85         p = buffer + sizeof(struct servent) + sizeof(char *);
86         memcpy(buffer + sizeof(struct servent), &p, sizeof(char *));
87         p = (char *)ALIGN(p);
88
89         if (new_serv.s_name != NULL) {
90                 size = strlen(new_serv.s_name);
91                 memcpy(p, new_serv.s_name, size);
92                 new_serv.s_name = p;
93                 p += size + 1;
94         }
95
96         if (new_serv.s_proto != NULL) {
97                 size = strlen(new_serv.s_proto);
98                 memcpy(p, new_serv.s_proto, size);
99                 new_serv.s_proto = p;
100                 p += size + 1;
101         }
102
103         if (new_serv.s_aliases != NULL) {
104                 p = (char *)ALIGN(p);
105                 memcpy(p, new_serv.s_aliases, sizeof(char *) * aliases_size);
106                 new_serv.s_aliases = (char **)p;
107                 p += sizeof(char *) * (aliases_size + 1);
108
109                 for (alias = new_serv.s_aliases; *alias; ++alias) {
110                         size = strlen(*alias);
111                         memcpy(p, *alias, size);
112                         *alias = p;
113                         p += size + 1;
114                 }
115         }
116
117         memcpy(buffer, &new_serv, sizeof(struct servent));
118         TRACE_OUT(services_marshal_func);
119         return (NS_SUCCESS);
120 }
121
122 static int
123 services_lookup_func(const char *key, size_t key_size, char **buffer,
124         size_t *buffer_size)
125 {
126         enum nss_lookup_type lookup_type;
127         char    *name = NULL;
128         char    *proto = NULL;
129         size_t  size, size2;
130         int     port;
131
132         struct servent *result;
133
134         TRACE_IN(services_lookup_func);
135
136         assert(buffer != NULL);
137         assert(buffer_size != NULL);
138
139         if (key_size < sizeof(enum nss_lookup_type)) {
140                 TRACE_OUT(passwd_lookup_func);
141                 return (NS_UNAVAIL);
142         }
143         memcpy(&lookup_type, key, sizeof(enum nss_lookup_type));
144
145         switch (lookup_type) {
146         case nss_lt_name:
147                 size = key_size - sizeof(enum nss_lookup_type);
148                 name = (char *)calloc(1, size + 1);
149                 assert(name != NULL);
150                 memcpy(name, key + sizeof(enum nss_lookup_type), size);
151
152                 size2 = strlen(name) + 1;
153
154                 if (size2 < size)
155                         proto = name + size2;
156                 else
157                         proto = NULL;
158                 break;
159         case nss_lt_id:
160                 if (key_size < sizeof(enum nss_lookup_type) +
161                         sizeof(int)) {
162                         TRACE_OUT(passwd_lookup_func);
163                         return (NS_UNAVAIL);
164                 }
165
166                 memcpy(&port, key + sizeof(enum nss_lookup_type),
167                         sizeof(int));
168
169                 size = key_size - sizeof(enum nss_lookup_type) - sizeof(int);
170                 if (size > 0) {
171                         proto = (char *)calloc(1, size + 1);
172                         assert(proto != NULL);
173                         memcpy(proto, key + sizeof(enum nss_lookup_type) +
174                                 sizeof(int), size);
175                 }
176                 break;
177         default:
178                 TRACE_OUT(passwd_lookup_func);
179                 return (NS_UNAVAIL);
180         }
181
182         switch (lookup_type) {
183         case nss_lt_name:
184                 result = getservbyname(name, proto);
185                 free(name);
186                 break;
187         case nss_lt_id:
188                 result = getservbyport(port, proto);
189                 free(proto);
190                 break;
191         default:
192                 /* SHOULD NOT BE REACHED */
193                 break;
194         }
195
196         if (result != NULL) {
197                 services_marshal_func(result, NULL, buffer_size);
198                 *buffer = (char *)malloc(*buffer_size);
199                 assert(*buffer != NULL);
200                 services_marshal_func(result, *buffer, buffer_size);
201         }
202
203         TRACE_OUT(services_lookup_func);
204         return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
205 }
206
207 static void *
208 services_mp_init_func()
209 {
210         TRACE_IN(services_mp_init_func);
211         setservent(0);
212         TRACE_OUT(services_mp_init_func);
213
214         return (NULL);
215 }
216
217 static int
218 services_mp_lookup_func(char **buffer, size_t *buffer_size, void *mdata)
219 {
220         struct servent *result;
221
222         TRACE_IN(services_mp_lookup_func);
223         result = getservent();
224         if (result != NULL) {
225                 services_marshal_func(result, NULL, buffer_size);
226                 *buffer = (char *)malloc(*buffer_size);
227                 assert(*buffer != NULL);
228                 services_marshal_func(result, *buffer, buffer_size);
229         }
230
231         TRACE_OUT(services_mp_lookup_func);
232         return (result == NULL ? NS_NOTFOUND : NS_SUCCESS);
233 }
234
235 static void
236 services_mp_destroy_func(void *mdata)
237 {
238         TRACE_IN(services_mp_destroy_func);
239         TRACE_OUT(services_mp_destroy_func);
240 }
241
242 struct agent *
243 init_services_agent()
244 {
245         struct common_agent     *retval;
246         TRACE_IN(init_services_agent);
247
248         retval = (struct common_agent *)calloc(1, sizeof(struct common_agent));
249         assert(retval != NULL);
250
251         retval->parent.name = strdup("services");
252         assert(retval->parent.name != NULL);
253
254         retval->parent.type = COMMON_AGENT;
255         retval->lookup_func = services_lookup_func;
256
257         TRACE_OUT(init_services_agent);
258         return ((struct agent *)retval);
259 }
260
261 struct agent *
262 init_services_mp_agent()
263 {
264         struct multipart_agent  *retval;
265
266         TRACE_IN(init_services_mp_agent);
267         retval = (struct multipart_agent *)calloc(1,
268                 sizeof(struct multipart_agent));
269         assert(retval != NULL);
270
271         retval->parent.name = strdup("services");
272         retval->parent.type = MULTIPART_AGENT;
273         retval->mp_init_func = services_mp_init_func;
274         retval->mp_lookup_func = services_mp_lookup_func;
275         retval->mp_destroy_func = services_mp_destroy_func;
276         assert(retval->parent.name != NULL);
277
278         TRACE_OUT(init_services_mp_agent);
279         return ((struct agent *)retval);
280 }