2 This file is part of GNUnet
3 (C) 2013, 2014 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
30 #include "gnunet_util_lib.h"
31 #include "gnunet_gnsrecord_lib.h"
32 #include "gnunet_dnsparser_lib.h"
33 #include "gnunet_gnsrecord_plugin.h"
37 * Convert the 'value' of a record to a string.
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
46 gns_value_to_string (void *cls,
55 case GNUNET_GNSRECORD_TYPE_PKEY:
56 if (data_size != sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey))
58 return GNUNET_CRYPTO_ecdsa_public_key_to_string (data);
59 case GNUNET_GNSRECORD_TYPE_NICK:
60 return GNUNET_strndup (data, data_size);
61 case GNUNET_GNSRECORD_TYPE_LEHO:
62 return GNUNET_strndup (data, data_size);
63 case GNUNET_GNSRECORD_TYPE_GNS2DNS:
71 ns = GNUNET_DNSPARSER_parse_name (data,
74 ip = GNUNET_DNSPARSER_parse_name (data,
82 GNUNET_free_non_null (ns);
83 GNUNET_free_non_null (ip);
86 GNUNET_asprintf (&nstr,
90 GNUNET_free_non_null (ns);
91 GNUNET_free_non_null (ip);
94 case GNUNET_GNSRECORD_TYPE_VPN:
96 const struct GNUNET_TUN_GnsVpnRecord *vpn;
100 if ( (data_size <= sizeof (struct GNUNET_TUN_GnsVpnRecord)) ||
101 ('\0' != cdata[data_size - 1]) )
102 return NULL; /* malformed */
104 GNUNET_asprintf (&vpn_str,
106 (unsigned int) ntohs (vpn->proto),
107 (const char*) GNUNET_i2s_full (&vpn->peer),
108 (const char*) &vpn[1]);
111 case GNUNET_GNSRECORD_TYPE_BOX:
113 const struct GNUNET_GNSRECORD_BoxRecord *box;
118 if (data_size < sizeof (struct GNUNET_GNSRECORD_BoxRecord))
119 return NULL; /* malformed */
121 rt = ntohl (box->record_type);
122 ival = GNUNET_GNSRECORD_value_to_string (rt,
124 data_size - sizeof (struct GNUNET_GNSRECORD_BoxRecord));
126 return NULL; /* malformed */
127 GNUNET_asprintf (&box_str,
129 (unsigned int) ntohs (box->protocol),
130 (unsigned int) ntohs (box->service),
143 * Convert human-readable version of a 'value' of a record to the binary
146 * @param cls closure, unused
147 * @param type type of the record
148 * @param s human-readable string
149 * @param data set to value in binary encoding (will be allocated)
150 * @param data_size set to number of bytes in @a data
151 * @return #GNUNET_OK on success
154 gns_string_to_value (void *cls,
160 struct GNUNET_CRYPTO_EcdsaPublicKey pkey;
163 return GNUNET_SYSERR;
167 case GNUNET_GNSRECORD_TYPE_PKEY:
169 GNUNET_CRYPTO_ecdsa_public_key_from_string (s, strlen (s), &pkey))
171 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
172 _("Unable to parse PKEY record `%s'\n"),
174 return GNUNET_SYSERR;
176 *data = GNUNET_new (struct GNUNET_CRYPTO_EcdsaPublicKey);
177 memcpy (*data, &pkey, sizeof (pkey));
178 *data_size = sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey);
181 case GNUNET_GNSRECORD_TYPE_NICK:
182 *data = GNUNET_strdup (s);
183 *data_size = strlen (s);
185 case GNUNET_GNSRECORD_TYPE_LEHO:
186 *data = GNUNET_strdup (s);
187 *data_size = strlen (s);
189 case GNUNET_GNSRECORD_TYPE_GNS2DNS:
196 cpy = GNUNET_strdup (s);
197 at = strchr (cpy, '@');
200 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
201 _("Unable to parse GNS2DNS record `%s'\n"),
204 return GNUNET_SYSERR;
211 GNUNET_DNSPARSER_builder_add_name (nsbuf,
216 GNUNET_DNSPARSER_builder_add_name (nsbuf,
221 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
222 _("Failed to serialize GNS2DNS record with value `%s'\n"),
225 return GNUNET_SYSERR;
229 *data = GNUNET_malloc (off);
230 memcpy (*data, nsbuf, off);
233 case GNUNET_GNSRECORD_TYPE_VPN:
235 struct GNUNET_TUN_GnsVpnRecord *vpn;
236 char s_peer[103 + 1];
237 char s_serv[253 + 1];
242 &proto, s_peer, s_serv))
244 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
245 _("Unable to parse VPN record string `%s'\n"),
247 return GNUNET_SYSERR;
249 *data_size = sizeof (struct GNUNET_TUN_GnsVpnRecord) + strlen (s_serv) + 1;
250 *data = vpn = GNUNET_malloc (*data_size);
251 if (GNUNET_OK != GNUNET_CRYPTO_eddsa_public_key_from_string ((char*) s_peer,
253 &vpn->peer.public_key))
257 return GNUNET_SYSERR;
259 vpn->proto = htons ((uint16_t) proto);
260 strcpy ((char*)&vpn[1], s_serv);
263 case GNUNET_GNSRECORD_TYPE_BOX:
265 struct GNUNET_GNSRECORD_BoxRecord *box;
266 size_t slen = strlen (s) + 1;
268 unsigned int protocol;
269 unsigned int service;
270 unsigned int record_type;
281 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
282 _("Unable to parse BOX record string `%s'\n"),
284 return GNUNET_SYSERR;
287 GNUNET_GNSRECORD_string_to_value (record_type,
291 return GNUNET_SYSERR;
292 *data_size = sizeof (struct GNUNET_GNSRECORD_BoxRecord) + bval_size;
293 *data = box = GNUNET_malloc (*data_size);
294 box->protocol = htons (protocol);
295 box->service = htons (service);
296 box->record_type = htonl (record_type);
304 return GNUNET_SYSERR;
310 * Mapping of record type numbers to human-readable
317 { "PKEY", GNUNET_GNSRECORD_TYPE_PKEY },
318 { "NICK", GNUNET_GNSRECORD_TYPE_NICK },
319 { "LEHO", GNUNET_GNSRECORD_TYPE_LEHO },
320 { "VPN", GNUNET_GNSRECORD_TYPE_VPN },
321 { "GNS2DNS", GNUNET_GNSRECORD_TYPE_GNS2DNS },
322 { "BOX", GNUNET_GNSRECORD_TYPE_BOX },
328 * Convert a type name (i.e. "AAAA") to the corresponding number.
330 * @param cls closure, unused
331 * @param gns_typename name to convert
332 * @return corresponding number, UINT32_MAX on error
335 gns_typename_to_number (void *cls,
336 const char *gns_typename)
341 while ( (gns_name_map[i].name != NULL) &&
342 (0 != strcasecmp (gns_typename, gns_name_map[i].name)) )
344 return gns_name_map[i].number;
349 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
351 * @param cls closure, unused
352 * @param type number of a type to convert
353 * @return corresponding typestring, NULL on error
356 gns_number_to_typename (void *cls,
362 while ( (gns_name_map[i].name != NULL) &&
363 (type != gns_name_map[i].number) )
365 return gns_name_map[i].name;
370 * Entry point for the plugin.
373 * @return the exported block API
376 libgnunet_plugin_gnsrecord_gns_init (void *cls)
378 struct GNUNET_GNSRECORD_PluginFunctions *api;
380 api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
381 api->value_to_string = &gns_value_to_string;
382 api->string_to_value = &gns_string_to_value;
383 api->typename_to_number = &gns_typename_to_number;
384 api->number_to_typename = &gns_number_to_typename;
390 * Exit point from the plugin.
392 * @param cls the return value from #libgnunet_plugin_block_test_init()
396 libgnunet_plugin_gnsrecord_gns_done (void *cls)
398 struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
404 /* end of plugin_gnsrecord_gns.c */