child-rekey: Don't change state to INSTALLED if it was already REKEYING
[strongswan.git] / src / libstrongswan / credentials / cred_encoding.c
1 /*
2 * Copyright (C) 2009 Martin Willi
3 * Hochschule fuer Technik Rapperswil
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 */
15
16 #include "cred_encoding.h"
17
18 #include <stdint.h>
19
20 #include <collections/linked_list.h>
21 #include <collections/hashtable.h>
22 #include <threading/rwlock.h>
23
24 typedef struct private_cred_encoding_t private_cred_encoding_t;
25
26 /**
27 * Private data of an cred_encoding_t object.
28 */
29 struct private_cred_encoding_t {
30
31 /**
32 * Public cred_encoding_t interface.
33 */
34 cred_encoding_t public;
35
36 /**
37 * cached encodings, a table for each encoding_type_t, containing chunk_t*
38 */
39 hashtable_t *cache[CRED_ENCODING_MAX];
40
41 /**
42 * Registered encoding fuctions, cred_encoder_t
43 */
44 linked_list_t *encoders;
45
46 /**
47 * lock to access cache/encoders
48 */
49 rwlock_t *lock;
50 };
51
52 /**
53 * See header.
54 */
55 bool cred_encoding_args(va_list args, ...)
56 {
57 va_list parts, copy;
58 bool failed = FALSE;
59
60 va_start(parts, args);
61
62 while (!failed)
63 {
64 cred_encoding_part_t current, target;
65 chunk_t *out, data;
66
67 /* get the part we are looking for */
68 target = va_arg(parts, cred_encoding_part_t);
69 if (target == CRED_PART_END)
70 {
71 break;
72 }
73 out = va_arg(parts, chunk_t*);
74
75 va_copy(copy, args);
76 while (!failed)
77 {
78 current = va_arg(copy, cred_encoding_part_t);
79 if (current == CRED_PART_END)
80 {
81 failed = TRUE;
82 break;
83 }
84 data = va_arg(copy, chunk_t);
85 if (current == target)
86 {
87 *out = data;
88 break;
89 }
90 }
91 va_end(copy);
92 }
93 va_end(parts);
94 return !failed;
95 }
96
97 METHOD(cred_encoding_t, get_cache, bool,
98 private_cred_encoding_t *this, cred_encoding_type_t type, void *cache,
99 chunk_t *encoding)
100 {
101 chunk_t *chunk;
102
103 if (type >= CRED_ENCODING_MAX || (int)type < 0)
104 {
105 return FALSE;
106 }
107 this->lock->read_lock(this->lock);
108 chunk = this->cache[type]->get(this->cache[type], cache);
109 if (chunk)
110 {
111 *encoding = *chunk;
112 }
113 this->lock->unlock(this->lock);
114 return !!chunk;
115 }
116
117 /**
118 * Implementation of cred_encoding_t.encode
119 */
120 static bool encode(private_cred_encoding_t *this, cred_encoding_type_t type,
121 void *cache, chunk_t *encoding, ...)
122 {
123 enumerator_t *enumerator;
124 va_list args, copy;
125 cred_encoder_t encode;
126 bool success = FALSE;
127 chunk_t *chunk;
128
129 if (type >= CRED_ENCODING_MAX || (int)type < 0)
130 {
131 return FALSE;
132 }
133 this->lock->read_lock(this->lock);
134 if (cache)
135 {
136 chunk = this->cache[type]->get(this->cache[type], cache);
137 if (chunk)
138 {
139 *encoding = *chunk;
140 this->lock->unlock(this->lock);
141 return TRUE;
142 }
143 }
144 va_start(args, encoding);
145 enumerator = this->encoders->create_enumerator(this->encoders);
146 while (enumerator->enumerate(enumerator, &encode))
147 {
148 va_copy(copy, args);
149 success = encode(type, encoding, copy);
150 va_end(copy);
151 if (success)
152 {
153 break;
154 }
155 }
156 enumerator->destroy(enumerator);
157 this->lock->unlock(this->lock);
158 va_end(args);
159
160 if (success && cache)
161 {
162 chunk = malloc_thing(chunk_t);
163 *chunk = *encoding;
164 this->lock->write_lock(this->lock);
165 chunk = this->cache[type]->put(this->cache[type], cache, chunk);
166 this->lock->unlock(this->lock);
167 if (chunk)
168 {
169 free(chunk->ptr);
170 free(chunk);
171 }
172 }
173 return success;
174 }
175
176 METHOD(cred_encoding_t, cache, void,
177 private_cred_encoding_t *this, cred_encoding_type_t type, void *cache,
178 chunk_t encoding)
179 {
180 chunk_t *chunk;
181
182 if (type >= CRED_ENCODING_MAX || (int)type < 0)
183 {
184 return free(encoding.ptr);
185 }
186 chunk = malloc_thing(chunk_t);
187 *chunk = encoding;
188 this->lock->write_lock(this->lock);
189 chunk = this->cache[type]->put(this->cache[type], cache, chunk);
190 this->lock->unlock(this->lock);
191 /* free an encoding already associated to the cache */
192 if (chunk)
193 {
194 free(chunk->ptr);
195 free(chunk);
196 }
197 }
198
199 METHOD(cred_encoding_t, clear_cache, void,
200 private_cred_encoding_t *this, void *cache)
201 {
202 cred_encoding_type_t type;
203 chunk_t *chunk;
204
205 this->lock->write_lock(this->lock);
206 for (type = 0; type < CRED_ENCODING_MAX; type++)
207 {
208 chunk = this->cache[type]->remove(this->cache[type], cache);
209 if (chunk)
210 {
211 chunk_free(chunk);
212 free(chunk);
213 }
214 }
215 this->lock->unlock(this->lock);
216 }
217
218 METHOD(cred_encoding_t, add_encoder, void,
219 private_cred_encoding_t *this, cred_encoder_t encoder)
220 {
221 this->lock->write_lock(this->lock);
222 this->encoders->insert_last(this->encoders, encoder);
223 this->lock->unlock(this->lock);
224 }
225
226 METHOD(cred_encoding_t, remove_encoder, void,
227 private_cred_encoding_t *this, cred_encoder_t encoder)
228 {
229 this->lock->write_lock(this->lock);
230 this->encoders->remove(this->encoders, encoder, NULL);
231 this->lock->unlock(this->lock);
232 }
233
234 METHOD(cred_encoding_t, destroy, void,
235 private_cred_encoding_t *this)
236 {
237 cred_encoding_type_t type;
238
239 for (type = 0; type < CRED_ENCODING_MAX; type++)
240 {
241 /* We explicitly do not free remaining encodings. All creds should
242 * have gone now, and they are responsible for cleaning out their
243 * cache entries. Not flushing here allows the leak detective to
244 * complain if a credential did not flush cached encodings. */
245 this->cache[type]->destroy(this->cache[type]);
246 }
247 this->encoders->destroy(this->encoders);
248 this->lock->destroy(this->lock);
249 free(this);
250 }
251
252 /**
253 * See header
254 */
255 cred_encoding_t *cred_encoding_create()
256 {
257 private_cred_encoding_t *this;
258 cred_encoding_type_t type;
259
260 INIT(this,
261 .public = {
262 .encode = (bool(*)(cred_encoding_t*, cred_encoding_type_t type, void *cache, chunk_t *encoding, ...))encode,
263 .get_cache = _get_cache,
264 .cache = _cache,
265 .clear_cache = _clear_cache,
266 .add_encoder = _add_encoder,
267 .remove_encoder = _remove_encoder,
268 .destroy = _destroy,
269 },
270 .encoders = linked_list_create(),
271 .lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
272 );
273
274 for (type = 0; type < CRED_ENCODING_MAX; type++)
275 {
276 this->cache[type] = hashtable_create(hashtable_hash_ptr,
277 hashtable_equals_ptr, 8);
278 }
279
280 return &this->public;
281 }
282