2 This file is part of GNUnet
3 (C) 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 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 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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
31 #include "gnunet_util_lib.h"
32 #include "gnunet_gnsrecord_lib.h"
33 #include "gnunet_dnsparser_lib.h"
34 #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);
60 case GNUNET_GNSRECORD_TYPE_NICK:
61 return GNUNET_strndup (data, data_size);
62 case GNUNET_GNSRECORD_TYPE_LEHO:
63 return GNUNET_strndup (data, data_size);
64 case GNUNET_GNSRECORD_TYPE_GNS2DNS:
72 ns = GNUNET_DNSPARSER_parse_name (data,
75 ip = GNUNET_DNSPARSER_parse_name (data,
83 GNUNET_free_non_null (ns);
84 GNUNET_free_non_null (ip);
87 GNUNET_asprintf (&nstr,
91 GNUNET_free_non_null (ns);
92 GNUNET_free_non_null (ip);
95 case GNUNET_GNSRECORD_TYPE_VPN:
97 const struct GNUNET_TUN_GnsVpnRecord *vpn;
101 if ( (data_size <= sizeof (struct GNUNET_TUN_GnsVpnRecord)) ||
102 ('\0' != cdata[data_size - 1]) )
103 return NULL; /* malformed */
105 GNUNET_asprintf (&vpn_str,
107 (unsigned int) ntohs (vpn->proto),
108 (const char*) GNUNET_i2s_full (&vpn->peer),
109 (const char*) &vpn[1]);
112 case GNUNET_GNSRECORD_TYPE_BOX:
114 const struct GNUNET_GNSRECORD_BoxRecord *box;
119 if (data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
120 return NULL; /* malformed */
122 rt = ntohl (box->record_type);
123 ival = GNUNET_GNSRECORD_value_to_string (rt,
125 data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord));
127 return NULL; /* malformed */
128 GNUNET_asprintf (&box_str,
130 (unsigned int) ntohs (box->protocol),
131 (unsigned int) ntohs (box->service),
144 * Convert human-readable version of a 'value' of a record to the binary
147 * @param cls closure, unused
148 * @param type type of the record
149 * @param s human-readable string
150 * @param data set to value in binary encoding (will be allocated)
151 * @param data_size set to number of bytes in @a data
152 * @return #GNUNET_OK on success
155 gns_string_to_value (void *cls,
161 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
164 return GNUNET_SYSERR;
168 case GNUNET_GNSRECORD_TYPE_PKEY:
170 GNUNET_CRYPTO_ecdsa_public_key_from_string (s, strlen (s), &pkey))
172 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
173 _("Unable to parse PKEY record `%s'\n"),
175 return GNUNET_SYSERR;
177 *data = GNUNET_new (struct GNUNET_CRYPTO_EcdsaPublicKey);
178 memcpy (*data, &pkey, sizeof (pkey));
179 *data_size = sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey);
182 case GNUNET_GNSRECORD_TYPE_NICK:
183 *data = GNUNET_strdup (s);
184 *data_size = strlen (s);
186 case GNUNET_GNSRECORD_TYPE_LEHO:
187 *data = GNUNET_strdup (s);
188 *data_size = strlen (s);
190 case GNUNET_GNSRECORD_TYPE_GNS2DNS:
197 cpy = GNUNET_strdup (s);
198 at = strchr (cpy, '@');
201 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
202 _("Unable to parse GNS2DNS record `%s'\n"),
205 return GNUNET_SYSERR;
212 GNUNET_DNSPARSER_builder_add_name (nsbuf,
217 GNUNET_DNSPARSER_builder_add_name (nsbuf,
222 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
223 _("Failed to serialize GNS2DNS record with value `%s'\n"),
226 return GNUNET_SYSERR;
230 *data = GNUNET_malloc (off);
231 memcpy (*data, nsbuf, off);
234 case GNUNET_GNSRECORD_TYPE_VPN:
236 struct GNUNET_TUN_GnsVpnRecord *vpn;
237 char s_peer[103 + 1];
238 char s_serv[253 + 1];
243 &proto, s_peer, s_serv))
245 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
246 _("Unable to parse VPN record string `%s'\n"),
248 return GNUNET_SYSERR;
250 *data_size = sizeof (struct GNUNET_TUN_GnsVpnRecord) + strlen (s_serv) + 1;
251 *data = vpn = GNUNET_malloc (*data_size);
252 if (GNUNET_OK != GNUNET_CRYPTO_eddsa_public_key_from_string ((char*) s_peer,
254 &vpn->peer.public_key))
258 return GNUNET_SYSERR;
260 vpn->proto = htons ((uint16_t) proto);
261 strcpy ((char*)&vpn[1], s_serv);
264 case GNUNET_GNSRECORD_TYPE_BOX:
266 struct GNUNET_GNSRECORD_BoxRecord *box;
267 size_t slen = strlen (s) + 1;
269 unsigned int protocol;
270 unsigned int service;
271 unsigned int record_type;
282 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
283 _("Unable to parse BOX record string `%s'\n"),
285 return GNUNET_SYSERR;
288 GNUNET_GNSRECORD_string_to_value (record_type,
292 return GNUNET_SYSERR;
293 *data_size = sizeof (struct GNUNET_GNSRECORD_BoxRecord) + bval_size;
294 *data = box = GNUNET_malloc (*data_size);
295 box->protocol = htons (protocol);
296 box->service = htons (service);
297 box->record_type = htonl (record_type);
305 return GNUNET_SYSERR;
311 * Mapping of record type numbers to human-readable
318 { "PKEY", GNUNET_GNSRECORD_TYPE_PKEY },
319 { "NICK", GNUNET_GNSRECORD_TYPE_NICK },
320 { "LEHO", GNUNET_GNSRECORD_TYPE_LEHO },
321 { "VPN", GNUNET_GNSRECORD_TYPE_VPN },
322 { "GNS2DNS", GNUNET_GNSRECORD_TYPE_GNS2DNS },
323 { "BOX", GNUNET_GNSRECORD_TYPE_BOX },
329 * Convert a type name (i.e. "AAAA") to the corresponding number.
331 * @param cls closure, unused
332 * @param gns_typename name to convert
333 * @return corresponding number, UINT32_MAX on error
336 gns_typename_to_number (void *cls,
337 const char *gns_typename)
342 while ( (gns_name_map[i].name != NULL) &&
343 (0 != strcasecmp (gns_typename, gns_name_map[i].name)) )
345 return gns_name_map[i].number;
350 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
352 * @param cls closure, unused
353 * @param type number of a type to convert
354 * @return corresponding typestring, NULL on error
357 gns_number_to_typename (void *cls,
363 while ( (gns_name_map[i].name != NULL) &&
364 (type != gns_name_map[i].number) )
366 return gns_name_map[i].name;
371 * Entry point for the plugin.
374 * @return the exported block API
377 libgnunet_plugin_gnsrecord_gns_init (void *cls)
379 struct GNUNET_GNSRECORD_PluginFunctions *api;
381 api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
382 api->value_to_string = &gns_value_to_string;
383 api->string_to_value = &gns_string_to_value;
384 api->typename_to_number = &gns_typename_to_number;
385 api->number_to_typename = &gns_number_to_typename;
391 * Exit point from the plugin.
393 * @param cls the return value from #libgnunet_plugin_block_test_init
397 libgnunet_plugin_gnsrecord_gns_done (void *cls)
399 struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
405 /* end of plugin_gnsrecord_gns.c */