2 This file is part of GNUnet.
3 Copyright (C) 2009-2013 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 gnsrecord/gnsrecord_serialization.c
23 * @brief API to serialize and deserialize GNS records
24 * @author Martin Schanzenbach
25 * @author Matthias Wachs
26 * @author Christian Grothoff
29 #include "gnunet_util_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_signatures.h"
32 #include "gnunet_arm_service.h"
33 #include "gnunet_gnsrecord_lib.h"
34 #include "gnunet_dnsparser_lib.h"
35 #include "gnunet_tun_lib.h"
38 #define LOG(kind,...) GNUNET_log_from (kind, "gnsrecord",__VA_ARGS__)
41 * Set to 1 to check that all records are well-formed (can be converted
42 * to string) during serialization/deserialization.
44 #define DEBUG_GNSRECORDS 0
46 GNUNET_NETWORK_STRUCT_BEGIN
50 * Internal format of a record in the serialized form.
56 * Expiration time for the DNS record; relative or absolute depends
57 * on @e flags, network byte order.
59 uint64_t expiration_time GNUNET_PACKED;
62 * Number of bytes in 'data', network byte order.
64 uint32_t data_size GNUNET_PACKED;
67 * Type of the GNS/DNS record, network byte order.
69 uint32_t record_type GNUNET_PACKED;
72 * Flags for the record, network byte order.
74 uint32_t flags GNUNET_PACKED;
78 GNUNET_NETWORK_STRUCT_END
82 * Calculate how many bytes we will need to serialize the given
85 * @param rd_count number of records in the rd array
86 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
87 * @return the required size to serialize, -1 on error
90 GNUNET_GNSRECORD_records_get_size (unsigned int rd_count,
91 const struct GNUNET_GNSRECORD_Data *rd)
98 ret = sizeof (struct NetworkRecord) * rd_count;
99 for (unsigned int i=0;i<rd_count;i++)
101 if ((ret + rd[i].data_size) < ret)
106 ret += rd[i].data_size;
111 str = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
129 if (GNUNET_GNSRECORD_TYPE_PKEY == rd->record_type)
132 * Efficiently round up to the next
133 * power of 2 for padding
134 * https://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
143 return (ssize_t) ret;
148 * Serialize the given records to the given destination buffer.
150 * @param rd_count number of records in the rd array
151 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
152 * @param dest_size size of the destination array
153 * @param dest where to write the result
154 * @return the size of serialized records, -1 if records do not fit
157 GNUNET_GNSRECORD_records_serialize (unsigned int rd_count,
158 const struct GNUNET_GNSRECORD_Data *rd,
162 struct NetworkRecord rec;
166 for (unsigned int i=0;i<rd_count;i++)
168 LOG (GNUNET_ERROR_TYPE_DEBUG,
169 "Serializing record %u with flags %d and expiration time %llu\n",
172 (unsigned long long) rd[i].expiration_time);
173 rec.expiration_time = GNUNET_htonll (rd[i].expiration_time);
174 rec.data_size = htonl ((uint32_t) rd[i].data_size);
175 rec.record_type = htonl (rd[i].record_type);
176 rec.flags = htonl (rd[i].flags);
177 if ( (off + sizeof (rec) > dest_size) ||
178 (off + sizeof (rec) < off) )
183 GNUNET_memcpy (&dest[off],
187 if ( (off + rd[i].data_size > dest_size) ||
188 (off + rd[i].data_size < off) )
193 GNUNET_memcpy (&dest[off],
196 off += rd[i].data_size;
201 str = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
221 * Deserialize the given records to the given destination.
223 * @param len size of the serialized record data
224 * @param src the serialized record data
225 * @param rd_count number of records in the rd array
226 * @param dest where to put the data
227 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
230 GNUNET_GNSRECORD_records_deserialize (size_t len,
232 unsigned int rd_count,
233 struct GNUNET_GNSRECORD_Data *dest)
235 struct NetworkRecord rec;
239 for (unsigned int i=0;i<rd_count;i++)
241 if ( (off + sizeof (rec) > len) ||
242 (off + sizeof (rec) < off) )
245 return GNUNET_SYSERR;
250 dest[i].expiration_time = GNUNET_ntohll (rec.expiration_time);
251 dest[i].data_size = ntohl ((uint32_t) rec.data_size);
252 dest[i].record_type = ntohl (rec.record_type);
253 dest[i].flags = ntohl (rec.flags);
255 if ( (off + dest[i].data_size > len) ||
256 (off + dest[i].data_size < off) )
259 return GNUNET_SYSERR;
261 dest[i].data = &src[off];
262 off += dest[i].data_size;
263 #if GNUNET_EXTRA_LOGGING
267 str = GNUNET_GNSRECORD_value_to_string (dest[i].record_type,
273 return GNUNET_SYSERR;
278 LOG (GNUNET_ERROR_TYPE_DEBUG,
279 "Deserialized record %u with flags %d and expiration time %llu\n",
282 (unsigned long long) dest[i].expiration_time);
288 /* end of gnsrecord_serialization.c */