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Diffstat (limited to 'src/abd/plugin_gnsrecord_abd.c')
-rw-r--r-- | src/abd/plugin_gnsrecord_abd.c | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/src/abd/plugin_gnsrecord_abd.c b/src/abd/plugin_gnsrecord_abd.c new file mode 100644 index 000000000..811878627 --- /dev/null +++ b/src/abd/plugin_gnsrecord_abd.c | |||
@@ -0,0 +1,349 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet | ||
3 | Copyright (C) 2013 GNUnet e.V. | ||
4 | |||
5 | GNUnet is free software: you can redistribute it and/or modify it | ||
6 | under the terms of the GNU Affero General Public License as published | ||
7 | by the Free Software Foundation, either version 3 of the License, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | GNUnet is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Affero General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Affero General Public License | ||
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
17 | |||
18 | SPDX-License-Identifier: AGPL3.0-or-later | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file abd/plugin_gnsrecord_abd.c | ||
23 | * @brief gnsrecord plugin to provide the API for ABD records | ||
24 | * @author Martin Schanzenbach | ||
25 | */ | ||
26 | #include "platform.h" | ||
27 | |||
28 | #include "gnunet_util_lib.h" | ||
29 | |||
30 | #include "delegate_misc.h" | ||
31 | #include "abd_serialization.h" | ||
32 | #include "gnunet_abd_service.h" | ||
33 | #include "gnunet_gnsrecord_lib.h" | ||
34 | #include "gnunet_gnsrecord_plugin.h" | ||
35 | #include "gnunet_signatures.h" | ||
36 | /** | ||
37 | * Convert the 'value' of a record to a string. | ||
38 | * | ||
39 | * @param cls closure, unused | ||
40 | * @param type type of the record | ||
41 | * @param data value in binary encoding | ||
42 | * @param data_size number of bytes in @a data | ||
43 | * @return NULL on error, otherwise human-readable representation of the value | ||
44 | */ | ||
45 | static char * | ||
46 | abd_value_to_string (void *cls, | ||
47 | uint32_t type, | ||
48 | const void *data, | ||
49 | size_t data_size) | ||
50 | { | ||
51 | const char *cdata; | ||
52 | |||
53 | switch (type) | ||
54 | { | ||
55 | case GNUNET_GNSRECORD_TYPE_ATTRIBUTE: | ||
56 | { | ||
57 | struct GNUNET_ABD_DelegationRecord sets; | ||
58 | char *attr_str; | ||
59 | char *subject_pkey; | ||
60 | char *tmp_str; | ||
61 | int i; | ||
62 | if (data_size < sizeof (struct GNUNET_ABD_DelegationRecord)) | ||
63 | return NULL; /* malformed */ | ||
64 | |||
65 | GNUNET_memcpy (&sets, data, sizeof (sets)); | ||
66 | cdata = data; | ||
67 | |||
68 | struct GNUNET_ABD_DelegationSet set[ntohl (sets.set_count)]; | ||
69 | if (GNUNET_OK != | ||
70 | GNUNET_ABD_delegation_set_deserialize (GNUNET_ntohll ( | ||
71 | sets.data_size), | ||
72 | &cdata[sizeof (sets)], | ||
73 | ntohl (sets.set_count), | ||
74 | set)) | ||
75 | return NULL; | ||
76 | |||
77 | for (i = 0; i < ntohl (sets.set_count); i++) | ||
78 | { | ||
79 | subject_pkey = | ||
80 | GNUNET_CRYPTO_ecdsa_public_key_to_string (&set[i].subject_key); | ||
81 | |||
82 | if (0 == set[i].subject_attribute_len) | ||
83 | { | ||
84 | if (0 == i) | ||
85 | { | ||
86 | GNUNET_asprintf (&attr_str, "%s", subject_pkey); | ||
87 | } | ||
88 | else | ||
89 | { | ||
90 | GNUNET_asprintf (&tmp_str, "%s,%s", attr_str, subject_pkey); | ||
91 | GNUNET_free (attr_str); | ||
92 | attr_str = tmp_str; | ||
93 | } | ||
94 | } | ||
95 | else | ||
96 | { | ||
97 | if (0 == i) | ||
98 | { | ||
99 | GNUNET_asprintf (&attr_str, | ||
100 | "%s %s", | ||
101 | subject_pkey, | ||
102 | set[i].subject_attribute); | ||
103 | } | ||
104 | else | ||
105 | { | ||
106 | GNUNET_asprintf (&tmp_str, | ||
107 | "%s,%s %s", | ||
108 | attr_str, | ||
109 | subject_pkey, | ||
110 | set[i].subject_attribute); | ||
111 | GNUNET_free (attr_str); | ||
112 | attr_str = tmp_str; | ||
113 | } | ||
114 | } | ||
115 | GNUNET_free (subject_pkey); | ||
116 | } | ||
117 | return attr_str; | ||
118 | } | ||
119 | case GNUNET_GNSRECORD_TYPE_DELEGATE: | ||
120 | { | ||
121 | struct GNUNET_ABD_Delegate *cred; | ||
122 | char *cred_str; | ||
123 | |||
124 | cred = GNUNET_ABD_delegate_deserialize (data, data_size); | ||
125 | cred_str = GNUNET_ABD_delegate_to_string (cred); | ||
126 | GNUNET_free (cred); | ||
127 | return cred_str; | ||
128 | } | ||
129 | default: | ||
130 | return NULL; | ||
131 | } | ||
132 | } | ||
133 | |||
134 | |||
135 | /** | ||
136 | * Convert human-readable version of a 'value' of a record to the binary | ||
137 | * representation. | ||
138 | * | ||
139 | * @param cls closure, unused | ||
140 | * @param type type of the record | ||
141 | * @param s human-readable string | ||
142 | * @param data set to value in binary encoding (will be allocated) | ||
143 | * @param data_size set to number of bytes in @a data | ||
144 | * @return #GNUNET_OK on success | ||
145 | */ | ||
146 | static int | ||
147 | abd_string_to_value (void *cls, | ||
148 | uint32_t type, | ||
149 | const char *s, | ||
150 | void **data, | ||
151 | size_t *data_size) | ||
152 | { | ||
153 | if (NULL == s) | ||
154 | return GNUNET_SYSERR; | ||
155 | switch (type) | ||
156 | { | ||
157 | case GNUNET_GNSRECORD_TYPE_ATTRIBUTE: | ||
158 | { | ||
159 | struct GNUNET_ABD_DelegationRecord *sets; | ||
160 | char attr_str[253 + 1]; | ||
161 | char subject_pkey[52 + 1]; | ||
162 | char *token; | ||
163 | char *tmp_str; | ||
164 | int matches = 0; | ||
165 | int entries; | ||
166 | size_t tmp_data_size; | ||
167 | int i; | ||
168 | |||
169 | tmp_str = GNUNET_strdup (s); | ||
170 | token = strtok (tmp_str, ","); | ||
171 | entries = 0; | ||
172 | tmp_data_size = 0; | ||
173 | *data_size = sizeof (struct GNUNET_ABD_DelegationRecord); | ||
174 | while (NULL != token) | ||
175 | { | ||
176 | // also fills the variables subject_pley and attr_str if "regex"-like match | ||
177 | matches = SSCANF (token, "%s %s", subject_pkey, attr_str); | ||
178 | |||
179 | if (0 == matches) | ||
180 | { | ||
181 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
182 | _ ("Unable to parse ATTR record string `%s'\n"), | ||
183 | s); | ||
184 | GNUNET_free (tmp_str); | ||
185 | return GNUNET_SYSERR; | ||
186 | } | ||
187 | |||
188 | entries++; | ||
189 | token = strtok (NULL, ","); | ||
190 | } | ||
191 | GNUNET_free (tmp_str); | ||
192 | |||
193 | tmp_str = GNUNET_strdup (s); | ||
194 | token = strtok (tmp_str, ","); | ||
195 | if (NULL == token) | ||
196 | { | ||
197 | GNUNET_free (tmp_str); | ||
198 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Malformed string %s\n", s); | ||
199 | return GNUNET_SYSERR; | ||
200 | } | ||
201 | |||
202 | struct GNUNET_ABD_DelegationSet set[entries]; | ||
203 | // sets memory to be 0, starting at *set for the size of struct * entries | ||
204 | memset (set, 0, sizeof (struct GNUNET_ABD_DelegationSet) * entries); | ||
205 | for (i = 0; i < entries; i++) | ||
206 | { | ||
207 | matches = SSCANF (token, "%s %s", subject_pkey, attr_str); | ||
208 | |||
209 | // sets the public key for the set entry | ||
210 | GNUNET_CRYPTO_ecdsa_public_key_from_string (subject_pkey, | ||
211 | strlen (subject_pkey), | ||
212 | &set[i].subject_key); | ||
213 | |||
214 | // If not just key, also set subject attribute (Not A.a <- B but A.a <- B.b) | ||
215 | if (2 == matches) | ||
216 | { | ||
217 | set[i].subject_attribute_len = strlen (attr_str) + 1; | ||
218 | set[i].subject_attribute = GNUNET_strdup (attr_str); | ||
219 | } | ||
220 | // If more entries, then token string can take the next entry (separated by ',') by calling strtok again | ||
221 | token = strtok (NULL, ","); | ||
222 | } | ||
223 | tmp_data_size = GNUNET_ABD_delegation_set_get_size (entries, set); | ||
224 | |||
225 | if (-1 == tmp_data_size) | ||
226 | { | ||
227 | GNUNET_free (tmp_str); | ||
228 | return GNUNET_SYSERR; | ||
229 | } | ||
230 | *data_size += tmp_data_size; | ||
231 | *data = sets = GNUNET_malloc (*data_size); | ||
232 | GNUNET_ABD_delegation_set_serialize (entries, | ||
233 | set, | ||
234 | tmp_data_size, | ||
235 | (char *) &sets[1]); | ||
236 | for (i = 0; i < entries; i++) | ||
237 | { | ||
238 | if (0 != set[i].subject_attribute_len) | ||
239 | GNUNET_free ((char *) set[i].subject_attribute); | ||
240 | } | ||
241 | sets->set_count = htonl (entries); | ||
242 | sets->data_size = GNUNET_htonll (tmp_data_size); | ||
243 | |||
244 | GNUNET_free (tmp_str); | ||
245 | return GNUNET_OK; | ||
246 | } | ||
247 | case GNUNET_GNSRECORD_TYPE_DELEGATE: | ||
248 | { | ||
249 | struct GNUNET_ABD_Delegate *cred; | ||
250 | cred = GNUNET_ABD_delegate_from_string (s); | ||
251 | |||
252 | *data_size = GNUNET_ABD_delegate_serialize (cred, (char **) data); | ||
253 | |||
254 | return GNUNET_OK; | ||
255 | } | ||
256 | default: | ||
257 | return GNUNET_SYSERR; | ||
258 | } | ||
259 | } | ||
260 | |||
261 | |||
262 | /** | ||
263 | * Mapping of record type numbers to human-readable | ||
264 | * record type names. | ||
265 | */ | ||
266 | static struct | ||
267 | { | ||
268 | const char *name; | ||
269 | uint32_t number; | ||
270 | } name_map[] = {{"ATTR", GNUNET_GNSRECORD_TYPE_ATTRIBUTE}, | ||
271 | {"DEL", GNUNET_GNSRECORD_TYPE_DELEGATE}, | ||
272 | {NULL, UINT32_MAX}}; | ||
273 | |||
274 | |||
275 | /** | ||
276 | * Convert a type name (i.e. "AAAA") to the corresponding number. | ||
277 | * | ||
278 | * @param cls closure, unused | ||
279 | * @param gns_typename name to convert | ||
280 | * @return corresponding number, UINT32_MAX on error | ||
281 | */ | ||
282 | static uint32_t | ||
283 | abd_typename_to_number (void *cls, const char *gns_typename) | ||
284 | { | ||
285 | unsigned int i; | ||
286 | |||
287 | i = 0; | ||
288 | while ((name_map[i].name != NULL) && | ||
289 | (0 != strcasecmp (gns_typename, name_map[i].name))) | ||
290 | i++; | ||
291 | return name_map[i].number; | ||
292 | } | ||
293 | |||
294 | |||
295 | /** | ||
296 | * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A") | ||
297 | * | ||
298 | * @param cls closure, unused | ||
299 | * @param type number of a type to convert | ||
300 | * @return corresponding typestring, NULL on error | ||
301 | */ | ||
302 | static const char * | ||
303 | abd_number_to_typename (void *cls, uint32_t type) | ||
304 | { | ||
305 | unsigned int i; | ||
306 | |||
307 | i = 0; | ||
308 | while ((name_map[i].name != NULL) && (type != name_map[i].number)) | ||
309 | i++; | ||
310 | return name_map[i].name; | ||
311 | } | ||
312 | |||
313 | |||
314 | /** | ||
315 | * Entry point for the plugin. | ||
316 | * | ||
317 | * @param cls NULL | ||
318 | * @return the exported block API | ||
319 | */ | ||
320 | void * | ||
321 | libgnunet_plugin_gnsrecord_abd_init (void *cls) | ||
322 | { | ||
323 | struct GNUNET_GNSRECORD_PluginFunctions *api; | ||
324 | |||
325 | api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions); | ||
326 | api->value_to_string = &abd_value_to_string; | ||
327 | api->string_to_value = &abd_string_to_value; | ||
328 | api->typename_to_number = &abd_typename_to_number; | ||
329 | api->number_to_typename = &abd_number_to_typename; | ||
330 | return api; | ||
331 | } | ||
332 | |||
333 | |||
334 | /** | ||
335 | * Exit point from the plugin. | ||
336 | * | ||
337 | * @param cls the return value from #libgnunet_plugin_block_test_init | ||
338 | * @return NULL | ||
339 | */ | ||
340 | void * | ||
341 | libgnunet_plugin_gnsrecord_abd_done (void *cls) | ||
342 | { | ||
343 | struct GNUNET_GNSRECORD_PluginFunctions *api = cls; | ||
344 | |||
345 | GNUNET_free (api); | ||
346 | return NULL; | ||
347 | } | ||
348 | |||
349 | /* end of plugin_gnsrecord_abd.c */ | ||