2 This file is part of GNUnet
3 Copyright (C) 2013, 2014, 2016 GNUnet e.V.
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.
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.
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/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
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
30 #include "gnunet_util_lib.h"
31 #include "gnunet_gnsrecord_lib.h"
32 #include "gnunet_dnsparser_lib.h"
33 #include "gnunet_gnsrecord_plugin.h"
38 * Convert the 'value' of a record to a string.
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
47 gns_value_to_string (void *cls,
56 case GNUNET_GNSRECORD_TYPE_PKEY:
57 if (data_size != sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey))
59 return GNUNET_CRYPTO_ecdsa_public_key_to_string (data);
61 case GNUNET_GNSRECORD_TYPE_NICK:
62 return GNUNET_strndup (data, data_size);
64 case GNUNET_GNSRECORD_TYPE_LEHO:
65 return GNUNET_strndup (data, data_size);
67 case GNUNET_GNSRECORD_TYPE_GNS2DNS: {
74 ns = GNUNET_DNSPARSER_parse_name (data, data_size, &off);
78 GNUNET_free_non_null (ns);
81 /* DNS server IP/name must be UTF-8 */
82 ip = GNUNET_strdup (&((const char*) data)[off]);
83 GNUNET_asprintf (&nstr, "%s@%s", ns, ip);
84 GNUNET_free_non_null (ns);
85 GNUNET_free_non_null (ip);
89 case GNUNET_GNSRECORD_TYPE_VPN: {
90 struct GNUNET_TUN_GnsVpnRecord vpn;
94 if ((data_size <= sizeof(vpn)) || ('\0' != cdata[data_size - 1]))
95 return NULL; /* malformed */
96 /* need to memcpy for alignment */
97 GNUNET_memcpy (&vpn, data, sizeof(vpn));
98 GNUNET_asprintf (&vpn_str,
100 (unsigned int) ntohs (vpn.proto),
101 (const char *) GNUNET_i2s_full (&vpn.peer),
102 (const char *) &cdata[sizeof(vpn)]);
106 case GNUNET_GNSRECORD_TYPE_BOX: {
107 struct GNUNET_GNSRECORD_BoxRecord box;
113 if (data_size < sizeof(struct GNUNET_GNSRECORD_BoxRecord))
114 return NULL; /* malformed */
115 GNUNET_memcpy (&box, data, sizeof(box));
116 rt = ntohl (box.record_type);
117 ival = GNUNET_GNSRECORD_value_to_string (rt,
119 data_size - sizeof(box));
121 return NULL; /* malformed */
122 GNUNET_asprintf (&box_str,
124 (unsigned int) ntohs (box.protocol),
125 (unsigned int) ntohs (box.service),
139 * Convert human-readable version of a 'value' of a record to the binary
142 * @param cls closure, unused
143 * @param type type of the record
144 * @param s human-readable string
145 * @param data set to value in binary encoding (will be allocated)
146 * @param data_size set to number of bytes in @a data
147 * @return #GNUNET_OK on success
150 gns_string_to_value (void *cls,
156 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
159 return GNUNET_SYSERR;
162 case GNUNET_GNSRECORD_TYPE_PKEY:
164 GNUNET_CRYPTO_ecdsa_public_key_from_string (s, strlen (s), &pkey))
166 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
167 _ ("Unable to parse PKEY record `%s'\n"),
169 return GNUNET_SYSERR;
171 *data = GNUNET_new (struct GNUNET_CRYPTO_EcdsaPublicKey);
172 GNUNET_memcpy (*data, &pkey, sizeof(pkey));
173 *data_size = sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey);
176 case GNUNET_GNSRECORD_TYPE_NICK:
177 *data = GNUNET_strdup (s);
178 *data_size = strlen (s);
181 case GNUNET_GNSRECORD_TYPE_LEHO:
182 *data = GNUNET_strdup (s);
183 *data_size = strlen (s);
186 case GNUNET_GNSRECORD_TYPE_GNS2DNS: {
192 cpy = GNUNET_strdup (s);
193 at = strchr (cpy, '@');
196 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
197 _ ("Unable to parse GNS2DNS record `%s'\n"),
200 return GNUNET_SYSERR;
206 if (GNUNET_OK != GNUNET_DNSPARSER_builder_add_name (nsbuf,
211 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
213 "Failed to serialize GNS2DNS record with value `%s': Not a DNS name.\n"),
216 return GNUNET_SYSERR;
218 /* The DNS server location/name is in UTF-8 */
219 GNUNET_memcpy (&nsbuf[off], at, strlen (at) + 1);
220 off += strlen (at) + 1;
223 *data = GNUNET_malloc (off);
224 GNUNET_memcpy (*data, nsbuf, off);
228 case GNUNET_GNSRECORD_TYPE_VPN: {
229 struct GNUNET_TUN_GnsVpnRecord *vpn;
230 char s_peer[103 + 1];
231 char s_serv[253 + 1];
234 if (3 != sscanf (s, "%u %103s %253s", &proto, s_peer, s_serv))
236 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
237 _ ("Unable to parse VPN record string `%s'\n"),
239 return GNUNET_SYSERR;
241 *data_size = sizeof(struct GNUNET_TUN_GnsVpnRecord) + strlen (s_serv) + 1;
242 *data = vpn = GNUNET_malloc (*data_size);
244 GNUNET_CRYPTO_eddsa_public_key_from_string ((char *) s_peer,
246 &vpn->peer.public_key))
250 return GNUNET_SYSERR;
252 vpn->proto = htons ((uint16_t) proto);
253 strcpy ((char *) &vpn[1], s_serv);
257 case GNUNET_GNSRECORD_TYPE_BOX: {
258 struct GNUNET_GNSRECORD_BoxRecord *box;
260 unsigned int protocol;
261 unsigned int service;
262 unsigned int record_type;
266 if (3 != sscanf (s, "%u %u %u ", &protocol, &service, &record_type))
268 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
269 _ ("Unable to parse BOX record string `%s'\n"),
271 return GNUNET_SYSERR;
273 rest = snprintf (NULL, 0, "%u %u %u ", protocol, service, record_type);
274 if (GNUNET_OK != GNUNET_GNSRECORD_string_to_value (record_type,
278 return GNUNET_SYSERR;
279 *data_size = sizeof(struct GNUNET_GNSRECORD_BoxRecord) + bval_size;
280 *data = box = GNUNET_malloc (*data_size);
281 box->protocol = htons (protocol);
282 box->service = htons (service);
283 box->record_type = htonl (record_type);
284 GNUNET_memcpy (&box[1], bval, bval_size);
290 return GNUNET_SYSERR;
296 * Mapping of record type numbers to human-readable
303 } gns_name_map[] = { { "PKEY", GNUNET_GNSRECORD_TYPE_PKEY },
304 { "NICK", GNUNET_GNSRECORD_TYPE_NICK },
305 { "LEHO", GNUNET_GNSRECORD_TYPE_LEHO },
306 { "VPN", GNUNET_GNSRECORD_TYPE_VPN },
307 { "GNS2DNS", GNUNET_GNSRECORD_TYPE_GNS2DNS },
308 { "BOX", GNUNET_GNSRECORD_TYPE_BOX },
309 { NULL, UINT32_MAX } };
313 * Convert a type name (i.e. "AAAA") to the corresponding number.
315 * @param cls closure, unused
316 * @param gns_typename name to convert
317 * @return corresponding number, UINT32_MAX on error
320 gns_typename_to_number (void *cls, const char *gns_typename)
325 while ((NULL != gns_name_map[i].name) &&
326 (0 != strcasecmp (gns_typename, gns_name_map[i].name)))
328 return gns_name_map[i].number;
333 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
335 * @param cls closure, unused
336 * @param type number of a type to convert
337 * @return corresponding typestring, NULL on error
340 gns_number_to_typename (void *cls, uint32_t type)
345 while ((NULL != gns_name_map[i].name) && (type != gns_name_map[i].number))
347 return gns_name_map[i].name;
352 * Entry point for the plugin.
355 * @return the exported block API
358 libgnunet_plugin_gnsrecord_gns_init (void *cls)
360 struct GNUNET_GNSRECORD_PluginFunctions *api;
362 api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
363 api->value_to_string = &gns_value_to_string;
364 api->string_to_value = &gns_string_to_value;
365 api->typename_to_number = &gns_typename_to_number;
366 api->number_to_typename = &gns_number_to_typename;
372 * Exit point from the plugin.
374 * @param cls the return value from #libgnunet_plugin_block_test_init()
378 libgnunet_plugin_gnsrecord_gns_done (void *cls)
380 struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
387 /* end of plugin_gnsrecord_gns.c */