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.
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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 #ifndef LSD001 //DNS server IP/name must be UTF-8
82 ip = GNUNET_strdup((char*) &data[off]);
84 // Must be IP or DNS name
85 ip = GNUNET_DNSPARSER_parse_name (data, data_size, &off);
86 if ((NULL == ip) || (off != data_size))
89 GNUNET_free_non_null (ns);
90 GNUNET_free_non_null (ip);
94 GNUNET_asprintf (&nstr, "%s@%s", ns, ip);
95 GNUNET_free_non_null (ns);
96 GNUNET_free_non_null (ip);
100 case GNUNET_GNSRECORD_TYPE_VPN: {
101 struct GNUNET_TUN_GnsVpnRecord vpn;
105 if ((data_size <= sizeof(vpn)) || ('\0' != cdata[data_size - 1]))
106 return NULL; /* malformed */
107 /* need to memcpy for alignment */
108 GNUNET_memcpy (&vpn, data, sizeof(vpn));
109 GNUNET_asprintf (&vpn_str,
111 (unsigned int) ntohs (vpn.proto),
112 (const char *) GNUNET_i2s_full (&vpn.peer),
113 (const char *) &cdata[sizeof(vpn)]);
117 case GNUNET_GNSRECORD_TYPE_BOX: {
118 struct GNUNET_GNSRECORD_BoxRecord box;
124 if (data_size < sizeof(struct GNUNET_GNSRECORD_BoxRecord))
125 return NULL; /* malformed */
126 GNUNET_memcpy (&box, data, sizeof(box));
127 rt = ntohl (box.record_type);
128 ival = GNUNET_GNSRECORD_value_to_string (rt,
130 data_size - sizeof(box));
132 return NULL; /* malformed */
133 GNUNET_asprintf (&box_str,
135 (unsigned int) ntohs (box.protocol),
136 (unsigned int) ntohs (box.service),
150 * Convert human-readable version of a 'value' of a record to the binary
153 * @param cls closure, unused
154 * @param type type of the record
155 * @param s human-readable string
156 * @param data set to value in binary encoding (will be allocated)
157 * @param data_size set to number of bytes in @a data
158 * @return #GNUNET_OK on success
161 gns_string_to_value (void *cls,
167 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
170 return GNUNET_SYSERR;
173 case GNUNET_GNSRECORD_TYPE_PKEY:
175 GNUNET_CRYPTO_ecdsa_public_key_from_string (s, strlen (s), &pkey))
177 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
178 _ ("Unable to parse PKEY record `%s'\n"),
180 return GNUNET_SYSERR;
182 *data = GNUNET_new (struct GNUNET_CRYPTO_EcdsaPublicKey);
183 GNUNET_memcpy (*data, &pkey, sizeof(pkey));
184 *data_size = sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey);
187 case GNUNET_GNSRECORD_TYPE_NICK:
188 *data = GNUNET_strdup (s);
189 *data_size = strlen (s);
192 case GNUNET_GNSRECORD_TYPE_LEHO:
193 *data = GNUNET_strdup (s);
194 *data_size = strlen (s);
197 case GNUNET_GNSRECORD_TYPE_GNS2DNS: {
203 cpy = GNUNET_strdup (s);
204 at = strchr (cpy, '@');
207 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
208 _ ("Unable to parse GNS2DNS record `%s'\n"),
211 return GNUNET_SYSERR;
217 if (GNUNET_OK != GNUNET_DNSPARSER_builder_add_name (nsbuf,
222 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
224 "Failed to serialize GNS2DNS record with value `%s': Not a DNS name.\n"),
227 return GNUNET_SYSERR;
229 #ifndef LSD001 //The DNS server location/name is in UTF-8
230 GNUNET_memcpy (&nsbuf[off], at, strlen (at) + 1);
231 off += strlen (at) + 1;
234 GNUNET_DNSPARSER_builder_add_name (nsbuf, sizeof(nsbuf), &off, at))
236 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
238 "Failed to serialize GNS2DNS record with value `%s': Not a DNS name\n"),
241 return GNUNET_SYSERR;
246 *data = GNUNET_malloc (off);
247 GNUNET_memcpy (*data, nsbuf, off);
251 case GNUNET_GNSRECORD_TYPE_VPN: {
252 struct GNUNET_TUN_GnsVpnRecord *vpn;
253 char s_peer[103 + 1];
254 char s_serv[253 + 1];
257 if (3 != sscanf (s, "%u %103s %253s", &proto, s_peer, s_serv))
259 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
260 _ ("Unable to parse VPN record string `%s'\n"),
262 return GNUNET_SYSERR;
264 *data_size = sizeof(struct GNUNET_TUN_GnsVpnRecord) + strlen (s_serv) + 1;
265 *data = vpn = GNUNET_malloc (*data_size);
267 GNUNET_CRYPTO_eddsa_public_key_from_string ((char *) s_peer,
269 &vpn->peer.public_key))
273 return GNUNET_SYSERR;
275 vpn->proto = htons ((uint16_t) proto);
276 strcpy ((char *) &vpn[1], s_serv);
280 case GNUNET_GNSRECORD_TYPE_BOX: {
281 struct GNUNET_GNSRECORD_BoxRecord *box;
283 unsigned int protocol;
284 unsigned int service;
285 unsigned int record_type;
289 if (3 != sscanf (s, "%u %u %u ", &protocol, &service, &record_type))
291 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
292 _ ("Unable to parse BOX record string `%s'\n"),
294 return GNUNET_SYSERR;
296 rest = snprintf (NULL, 0, "%u %u %u ", protocol, service, record_type);
297 if (GNUNET_OK != GNUNET_GNSRECORD_string_to_value (record_type,
301 return GNUNET_SYSERR;
302 *data_size = sizeof(struct GNUNET_GNSRECORD_BoxRecord) + bval_size;
303 *data = box = GNUNET_malloc (*data_size);
304 box->protocol = htons (protocol);
305 box->service = htons (service);
306 box->record_type = htonl (record_type);
307 GNUNET_memcpy (&box[1], bval, bval_size);
313 return GNUNET_SYSERR;
319 * Mapping of record type numbers to human-readable
326 } gns_name_map[] = { { "PKEY", GNUNET_GNSRECORD_TYPE_PKEY },
327 { "NICK", GNUNET_GNSRECORD_TYPE_NICK },
328 { "LEHO", GNUNET_GNSRECORD_TYPE_LEHO },
329 { "VPN", GNUNET_GNSRECORD_TYPE_VPN },
330 { "GNS2DNS", GNUNET_GNSRECORD_TYPE_GNS2DNS },
331 { "BOX", GNUNET_GNSRECORD_TYPE_BOX },
332 { NULL, UINT32_MAX } };
336 * Convert a type name (i.e. "AAAA") to the corresponding number.
338 * @param cls closure, unused
339 * @param gns_typename name to convert
340 * @return corresponding number, UINT32_MAX on error
343 gns_typename_to_number (void *cls, const char *gns_typename)
348 while ((NULL != gns_name_map[i].name) &&
349 (0 != strcasecmp (gns_typename, gns_name_map[i].name)))
351 return gns_name_map[i].number;
356 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
358 * @param cls closure, unused
359 * @param type number of a type to convert
360 * @return corresponding typestring, NULL on error
363 gns_number_to_typename (void *cls, uint32_t type)
368 while ((NULL != gns_name_map[i].name) && (type != gns_name_map[i].number))
370 return gns_name_map[i].name;
375 * Entry point for the plugin.
378 * @return the exported block API
381 libgnunet_plugin_gnsrecord_gns_init (void *cls)
383 struct GNUNET_GNSRECORD_PluginFunctions *api;
385 api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
386 api->value_to_string = &gns_value_to_string;
387 api->string_to_value = &gns_string_to_value;
388 api->typename_to_number = &gns_typename_to_number;
389 api->number_to_typename = &gns_number_to_typename;
395 * Exit point from the plugin.
397 * @param cls the return value from #libgnunet_plugin_block_test_init()
401 libgnunet_plugin_gnsrecord_gns_done (void *cls)
403 struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
410 /* end of plugin_gnsrecord_gns.c */