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-rw-r--r--src/gns/plugin_gnsrecord_gns.c432
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diff --git a/src/gns/plugin_gnsrecord_gns.c b/src/gns/plugin_gnsrecord_gns.c
deleted file mode 100644
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--- a/src/gns/plugin_gnsrecord_gns.c
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1/*
2 This file is part of GNUnet
3 Copyright (C) 2013, 2014, 2016 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 gns/plugin_gnsrecord_gns.c
23 * @brief gnsrecord plugin to provide the API for fundamental GNS records
24 * This includes the VPN record because GNS resolution
25 * is expected to understand VPN records and (if needed)
26 * map the result to A/AAAA.
27 * @author Christian Grothoff
28 */
29#include "platform.h"
30#include "gnunet_util_lib.h"
31#include "gnunet_gnsrecord_lib.h"
32#include "gnunet_dnsparser_lib.h"
33#include "gnunet_gnsrecord_plugin.h"
34#include <inttypes.h>
35
36
37/**
38 * Convert the 'value' of a record to a string.
39 *
40 * @param cls closure, unused
41 * @param type type of the record
42 * @param data value in binary encoding
43 * @param data_size number of bytes in @a data
44 * @return NULL on error, otherwise human-readable representation of the value
45 */
46static char *
47gns_value_to_string (void *cls,
48 uint32_t type,
49 const void *data,
50 size_t data_size)
51{
52 const char *cdata;
53 struct GNUNET_IDENTITY_PublicKey pk;
54
55 switch (type)
56 {
57 case GNUNET_GNSRECORD_TYPE_PKEY:
58 case GNUNET_GNSRECORD_TYPE_EDKEY:
59 if (GNUNET_OK !=
60 GNUNET_GNSRECORD_identity_from_data (data,
61 data_size,
62 type,
63 &pk))
64 return NULL;
65 return GNUNET_IDENTITY_public_key_to_string (&pk);
66
67 case GNUNET_GNSRECORD_TYPE_NICK:
68 case GNUNET_GNSRECORD_TYPE_REDIRECT:
69 case GNUNET_GNSRECORD_TYPE_LEHO:
70 return GNUNET_strndup (data, data_size);
71
72 case GNUNET_GNSRECORD_TYPE_GNS2DNS: {
73 char *ns;
74 char *ip;
75 size_t off;
76 char *nstr;
77
78 off = 0;
79 ns = GNUNET_DNSPARSER_parse_name (data, data_size, &off);
80 if (NULL == ns)
81 {
82 GNUNET_break_op (0);
83 GNUNET_free (ns);
84 return NULL;
85 }
86 /* DNS server IP/name must be UTF-8 */
87 ip = GNUNET_strdup (&((const char*) data)[off]);
88 GNUNET_asprintf (&nstr, "%s@%s", ns, ip);
89 GNUNET_free (ns);
90 GNUNET_free (ip);
91 return nstr;
92 }
93
94 case GNUNET_GNSRECORD_TYPE_VPN: {
95 struct GNUNET_TUN_GnsVpnRecord vpn;
96 char *vpn_str;
97
98 cdata = data;
99 if ((data_size <= sizeof(vpn)) || ('\0' != cdata[data_size - 1]))
100 return NULL; /* malformed */
101 /* need to memcpy for alignment */
102 GNUNET_memcpy (&vpn, data, sizeof(vpn));
103 GNUNET_asprintf (&vpn_str,
104 "%u %s %s",
105 (unsigned int) ntohs (vpn.proto),
106 (const char *) GNUNET_i2s_full (&vpn.peer),
107 (const char *) &cdata[sizeof(vpn)]);
108 return vpn_str;
109 }
110
111 case GNUNET_GNSRECORD_TYPE_BOX: {
112 struct GNUNET_GNSRECORD_BoxRecord box;
113 uint32_t rt;
114 char *box_str;
115 char *ival;
116
117 cdata = data;
118 if (data_size < sizeof(struct GNUNET_GNSRECORD_BoxRecord))
119 return NULL; /* malformed */
120 GNUNET_memcpy (&box, data, sizeof(box));
121 rt = ntohl (box.record_type);
122 ival = GNUNET_GNSRECORD_value_to_string (rt,
123 &cdata[sizeof(box)],
124 data_size - sizeof(box));
125 if (NULL == ival)
126 return NULL; /* malformed */
127 GNUNET_asprintf (&box_str,
128 "%u %u %u %s",
129 (unsigned int) ntohs (box.protocol),
130 (unsigned int) ntohs (box.service),
131 (unsigned int) rt,
132 ival);
133 GNUNET_free (ival);
134 return box_str;
135 }
136 case GNUNET_GNSRECORD_TYPE_TOMBSTONE: {
137 return GNUNET_strdup (_ (
138 "This is a memento of an older block for internal maintenance."));
139 }
140 default:
141 return NULL;
142 }
143}
144
145
146/**
147 * Convert human-readable version of a 'value' of a record to the binary
148 * representation.
149 *
150 * @param cls closure, unused
151 * @param type type of the record
152 * @param s human-readable string
153 * @param data set to value in binary encoding (will be allocated)
154 * @param data_size set to number of bytes in @a data
155 * @return #GNUNET_OK on success
156 */
157static int
158gns_string_to_value (void *cls,
159 uint32_t type,
160 const char *s,
161 void **data,
162 size_t *data_size)
163{
164 struct GNUNET_IDENTITY_PublicKey pk;
165 uint32_t record_type;
166
167 if (NULL == s)
168 return GNUNET_SYSERR;
169 switch (type)
170 {
171 case GNUNET_GNSRECORD_TYPE_PKEY:
172 case GNUNET_GNSRECORD_TYPE_EDKEY:
173 if (GNUNET_OK !=
174 GNUNET_IDENTITY_public_key_from_string (s, &pk))
175 {
176 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
177 _ ("Unable to parse zone key record `%s'\n"),
178 s);
179 return GNUNET_SYSERR;
180 }
181 *data_size = GNUNET_IDENTITY_key_get_length (&pk);
182 if (GNUNET_OK !=
183 GNUNET_GNSRECORD_data_from_identity (&pk,
184 (char **) data,
185 data_size,
186 &record_type))
187 return GNUNET_SYSERR;
188 if (record_type != type)
189 {
190 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
191 _ ("Record type does not match parsed record type\n"));
192 return GNUNET_SYSERR;
193 }
194 return GNUNET_OK;
195
196 case GNUNET_GNSRECORD_TYPE_NICK:
197 case GNUNET_GNSRECORD_TYPE_REDIRECT:
198 case GNUNET_GNSRECORD_TYPE_LEHO:
199 *data = GNUNET_strdup (s);
200 *data_size = strlen (s);
201 return GNUNET_OK;
202
203 case GNUNET_GNSRECORD_TYPE_GNS2DNS: {
204 char nsbuf[514];
205 char *cpy;
206 char *at;
207 size_t off;
208
209 cpy = GNUNET_strdup (s);
210 at = strchr (cpy, '@');
211 if (NULL == at)
212 {
213 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
214 _ ("Unable to parse GNS2DNS record `%s'\n"),
215 s);
216 GNUNET_free (cpy);
217 return GNUNET_SYSERR;
218 }
219 *at = '\0';
220 at++;
221
222 off = 0;
223 if (GNUNET_OK !=
224 GNUNET_DNSPARSER_builder_add_name (nsbuf,
225 sizeof(nsbuf),
226 &off,
227 cpy))
228 {
229 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
230 _ (
231 "Failed to serialize GNS2DNS record with value `%s': Not a DNS name.\n"),
232 s);
233 GNUNET_free (cpy);
234 return GNUNET_SYSERR;
235 }
236 /* The DNS server location/name is in UTF-8 */
237 GNUNET_memcpy (&nsbuf[off], at, strlen (at) + 1);
238 off += strlen (at) + 1;
239 GNUNET_free (cpy);
240 *data_size = off;
241 *data = GNUNET_malloc (off);
242 GNUNET_memcpy (*data, nsbuf, off);
243 return GNUNET_OK;
244 }
245
246 case GNUNET_GNSRECORD_TYPE_VPN: {
247 struct GNUNET_TUN_GnsVpnRecord *vpn;
248 char s_peer[103 + 1];
249 char s_serv[253 + 1];
250 unsigned int proto;
251
252 if (3 != sscanf (s, "%u %103s %253s", &proto, s_peer, s_serv))
253 {
254 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
255 _ ("Unable to parse VPN record string `%s'\n"),
256 s);
257 return GNUNET_SYSERR;
258 }
259 *data_size = sizeof(struct GNUNET_TUN_GnsVpnRecord) + strlen (s_serv) + 1;
260 *data = vpn = GNUNET_malloc (*data_size);
261 if (GNUNET_OK !=
262 GNUNET_CRYPTO_eddsa_public_key_from_string ((char *) s_peer,
263 strlen (s_peer),
264 &vpn->peer.public_key))
265 {
266 GNUNET_free (vpn);
267 *data_size = 0;
268 return GNUNET_SYSERR;
269 }
270 vpn->proto = htons ((uint16_t) proto);
271 strcpy ((char *) &vpn[1], s_serv);
272 return GNUNET_OK;
273 }
274
275 case GNUNET_GNSRECORD_TYPE_BOX: {
276 struct GNUNET_GNSRECORD_BoxRecord *box;
277 size_t rest;
278 unsigned int protocol;
279 unsigned int service;
280 unsigned int record_type;
281 void *bval;
282 size_t bval_size;
283
284 if (3 != sscanf (s, "%u %u %u ", &protocol, &service, &record_type))
285 {
286 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
287 _ ("Unable to parse BOX record string `%s'\n"),
288 s);
289 return GNUNET_SYSERR;
290 }
291 rest = snprintf (NULL, 0, "%u %u %u ", protocol, service, record_type);
292 if (GNUNET_OK != GNUNET_GNSRECORD_string_to_value (record_type,
293 &s[rest],
294 &bval,
295 &bval_size))
296 return GNUNET_SYSERR;
297 *data_size = sizeof(struct GNUNET_GNSRECORD_BoxRecord) + bval_size;
298 *data = box = GNUNET_malloc (*data_size);
299 box->protocol = htons (protocol);
300 box->service = htons (service);
301 box->record_type = htonl (record_type);
302 GNUNET_memcpy (&box[1], bval, bval_size);
303 GNUNET_free (bval);
304 return GNUNET_OK;
305 }
306 case GNUNET_GNSRECORD_TYPE_TOMBSTONE: {
307 *data_size = 0;
308 *data = NULL;
309 return GNUNET_OK;
310 }
311
312 default:
313 return GNUNET_SYSERR;
314 }
315}
316
317
318/**
319 * Mapping of record type numbers to human-readable
320 * record type names.
321 */
322static struct
323{
324 const char *name;
325 uint32_t number;
326} gns_name_map[] = {
327 { "PKEY", GNUNET_GNSRECORD_TYPE_PKEY },
328 { "EDKEY", GNUNET_GNSRECORD_TYPE_EDKEY },
329 { "NICK", GNUNET_GNSRECORD_TYPE_NICK },
330 { "LEHO", GNUNET_GNSRECORD_TYPE_LEHO },
331 { "VPN", GNUNET_GNSRECORD_TYPE_VPN },
332 { "GNS2DNS", GNUNET_GNSRECORD_TYPE_GNS2DNS },
333 { "BOX", GNUNET_GNSRECORD_TYPE_BOX },
334 { "REDIRECT", GNUNET_GNSRECORD_TYPE_REDIRECT },
335 /* Tombstones should never be added manually
336 * so this makes sense, kind of */
337 { "\u271E", GNUNET_GNSRECORD_TYPE_TOMBSTONE },
338 { NULL, UINT32_MAX }
339};
340
341
342/**
343 * Convert a type name (e.g. "AAAA") to the corresponding number.
344 *
345 * @param cls closure, unused
346 * @param gns_typename name to convert
347 * @return corresponding number, UINT32_MAX on error
348 */
349static uint32_t
350gns_typename_to_number (void *cls,
351 const char *gns_typename)
352{
353 unsigned int i;
354
355 i = 0;
356 while ((NULL != gns_name_map[i].name) &&
357 (0 != strcasecmp (gns_typename, gns_name_map[i].name)))
358 i++;
359 return gns_name_map[i].number;
360}
361
362
363/**
364 * Convert a type number to the corresponding type string (e.g. 1 to "A")
365 *
366 * @param cls closure, unused
367 * @param type number of a type to convert
368 * @return corresponding typestring, NULL on error
369 */
370static const char *
371gns_number_to_typename (void *cls,
372 uint32_t type)
373{
374 unsigned int i;
375
376 i = 0;
377 while ( (NULL != gns_name_map[i].name) &&
378 (type != gns_name_map[i].number) )
379 i++;
380 return gns_name_map[i].name;
381}
382
383
384static enum GNUNET_GenericReturnValue
385gns_is_critical (void *cls, uint32_t type)
386{
387 return ((type == GNUNET_GNSRECORD_TYPE_PKEY) ||
388 (type == GNUNET_GNSRECORD_TYPE_EDKEY) ||
389 (type == GNUNET_GNSRECORD_TYPE_GNS2DNS) ||
390 (type == GNUNET_GNSRECORD_TYPE_REDIRECT) ?
391 GNUNET_YES : GNUNET_NO);
392}
393
394
395/**
396 * Entry point for the plugin.
397 *
398 * @param cls NULL
399 * @return the exported block API
400 */
401void *
402libgnunet_plugin_gnsrecord_gns_init (void *cls)
403{
404 struct GNUNET_GNSRECORD_PluginFunctions *api;
405
406 api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
407 api->value_to_string = &gns_value_to_string;
408 api->string_to_value = &gns_string_to_value;
409 api->typename_to_number = &gns_typename_to_number;
410 api->number_to_typename = &gns_number_to_typename;
411 api->is_critical = &gns_is_critical;
412 return api;
413}
414
415
416/**
417 * Exit point from the plugin.
418 *
419 * @param cls the return value from #libgnunet_plugin_block_test_init()
420 * @return NULL
421 */
422void *
423libgnunet_plugin_gnsrecord_gns_done (void *cls)
424{
425 struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
426
427 GNUNET_free (api);
428 return NULL;
429}
430
431
432/* end of plugin_gnsrecord_gns.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-18 13:17:27 +0000