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-rw-r--r--src/abd/plugin_gnsrecord_abd.c353
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diff --git a/src/abd/plugin_gnsrecord_abd.c b/src/abd/plugin_gnsrecord_abd.c
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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 */
45static char *
46abd_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 */
146static int
147abd_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 {
240 GNUNET_free_nz ((char *) set[i].subject_attribute);
241 set[i].subject_attribute = NULL;
242 }
243 }
244 sets->set_count = htonl (entries);
245 sets->data_size = GNUNET_htonll (tmp_data_size);
246
247 GNUNET_free (tmp_str);
248 return GNUNET_OK;
249 }
250 case GNUNET_GNSRECORD_TYPE_DELEGATE:
251 {
252 struct GNUNET_ABD_Delegate *cred;
253 cred = GNUNET_ABD_delegate_from_string (s);
254
255 *data_size = GNUNET_ABD_delegate_serialize (cred, (char **) data);
256
257 return GNUNET_OK;
258 }
259 default:
260 return GNUNET_SYSERR;
261 }
262}
263
264
265/**
266 * Mapping of record type numbers to human-readable
267 * record type names.
268 */
269static struct
270{
271 const char *name;
272 uint32_t number;
273} name_map[] = {{"ATTR", GNUNET_GNSRECORD_TYPE_ATTRIBUTE},
274 {"DEL", GNUNET_GNSRECORD_TYPE_DELEGATE},
275 {NULL, UINT32_MAX}};
276
277
278/**
279 * Convert a type name (e.g. "AAAA") to the corresponding number.
280 *
281 * @param cls closure, unused
282 * @param gns_typename name to convert
283 * @return corresponding number, UINT32_MAX on error
284 */
285static uint32_t
286abd_typename_to_number (void *cls, const char *gns_typename)
287{
288 unsigned int i;
289
290 i = 0;
291 while ((name_map[i].name != NULL) &&
292 (0 != strcasecmp (gns_typename, name_map[i].name)))
293 i++;
294 return name_map[i].number;
295}
296
297
298/**
299 * Convert a type number to the corresponding type string (e.g. 1 to "A")
300 *
301 * @param cls closure, unused
302 * @param type number of a type to convert
303 * @return corresponding typestring, NULL on error
304 */
305static const char *
306abd_number_to_typename (void *cls, uint32_t type)
307{
308 unsigned int i;
309
310 i = 0;
311 while ((name_map[i].name != NULL) && (type != name_map[i].number))
312 i++;
313 return name_map[i].name;
314}
315
316
317/**
318 * Entry point for the plugin.
319 *
320 * @param cls NULL
321 * @return the exported block API
322 */
323void *
324libgnunet_plugin_gnsrecord_abd_init (void *cls)
325{
326 struct GNUNET_GNSRECORD_PluginFunctions *api;
327
328 api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
329 api->value_to_string = &abd_value_to_string;
330 api->string_to_value = &abd_string_to_value;
331 api->typename_to_number = &abd_typename_to_number;
332 api->number_to_typename = &abd_number_to_typename;
333 return api;
334}
335
336
337/**
338 * Exit point from the plugin.
339 *
340 * @param cls the return value from #libgnunet_plugin_block_test_init
341 * @return NULL
342 */
343void *
344libgnunet_plugin_gnsrecord_abd_done (void *cls)
345{
346 struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
347
348 GNUNET_free (api);
349 return NULL;
350}
351
352
353/* end of plugin_gnsrecord_abd.c */
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