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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.
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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/>.
20 * @file gnsrecord/gnsrecord_serialization.c
21 * @brief API to serialize and deserialize GNS records
22 * @author Martin Schanzenbach
23 * @author Matthias Wachs
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_constants.h"
29 #include "gnunet_signatures.h"
30 #include "gnunet_arm_service.h"
31 #include "gnunet_gnsrecord_lib.h"
32 #include "gnunet_dnsparser_lib.h"
33 #include "gnunet_tun_lib.h"
36 #define LOG(kind,...) GNUNET_log_from (kind, "gnsrecord",__VA_ARGS__)
39 * Set to 1 to check that all records are well-formed (can be converted
40 * to string) during serialization/deserialization.
42 #define DEBUG_GNSRECORDS 0
44 GNUNET_NETWORK_STRUCT_BEGIN
48 * Internal format of a record in the serialized form.
54 * Expiration time for the DNS record; relative or absolute depends
55 * on @e flags, network byte order.
57 uint64_t expiration_time GNUNET_PACKED;
60 * Number of bytes in 'data', network byte order.
62 uint32_t data_size GNUNET_PACKED;
65 * Type of the GNS/DNS record, network byte order.
67 uint32_t record_type GNUNET_PACKED;
70 * Flags for the record, network byte order.
72 uint32_t flags GNUNET_PACKED;
76 GNUNET_NETWORK_STRUCT_END
80 * Calculate how many bytes we will need to serialize the given
83 * @param rd_count number of records in the rd array
84 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
85 * @return the required size to serialize, -1 on error
88 GNUNET_GNSRECORD_records_get_size (unsigned int rd_count,
89 const struct GNUNET_GNSRECORD_Data *rd)
96 ret = sizeof (struct NetworkRecord) * rd_count;
97 for (unsigned int i=0;i<rd_count;i++)
99 if ((ret + rd[i].data_size) < ret)
104 ret += rd[i].data_size;
109 str = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
127 if (GNUNET_GNSRECORD_TYPE_PKEY == rd->record_type)
130 * Efficiently round up to the next
131 * power of 2 for padding
132 * https://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
141 return (ssize_t) ret;
146 * Serialize the given records to the given destination buffer.
148 * @param rd_count number of records in the rd array
149 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
150 * @param dest_size size of the destination array
151 * @param dest where to write the result
152 * @return the size of serialized records, -1 if records do not fit
155 GNUNET_GNSRECORD_records_serialize (unsigned int rd_count,
156 const struct GNUNET_GNSRECORD_Data *rd,
160 struct NetworkRecord rec;
164 for (unsigned int i=0;i<rd_count;i++)
166 LOG (GNUNET_ERROR_TYPE_DEBUG,
167 "Serializing record %u with flags %d and expiration time %llu\n",
170 (unsigned long long) rd[i].expiration_time);
171 rec.expiration_time = GNUNET_htonll (rd[i].expiration_time);
172 rec.data_size = htonl ((uint32_t) rd[i].data_size);
173 rec.record_type = htonl (rd[i].record_type);
174 rec.flags = htonl (rd[i].flags);
175 if ( (off + sizeof (rec) > dest_size) ||
176 (off + sizeof (rec) < off) )
181 GNUNET_memcpy (&dest[off],
185 if ( (off + rd[i].data_size > dest_size) ||
186 (off + rd[i].data_size < off) )
191 GNUNET_memcpy (&dest[off],
194 off += rd[i].data_size;
199 str = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
219 * Deserialize the given records to the given destination.
221 * @param len size of the serialized record data
222 * @param src the serialized record data
223 * @param rd_count number of records in the rd array
224 * @param dest where to put the data
225 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
228 GNUNET_GNSRECORD_records_deserialize (size_t len,
230 unsigned int rd_count,
231 struct GNUNET_GNSRECORD_Data *dest)
233 struct NetworkRecord rec;
237 for (unsigned int i=0;i<rd_count;i++)
239 if ( (off + sizeof (rec) > len) ||
240 (off + sizeof (rec) < off) )
243 return GNUNET_SYSERR;
248 dest[i].expiration_time = GNUNET_ntohll (rec.expiration_time);
249 dest[i].data_size = ntohl ((uint32_t) rec.data_size);
250 dest[i].record_type = ntohl (rec.record_type);
251 dest[i].flags = ntohl (rec.flags);
253 if ( (off + dest[i].data_size > len) ||
254 (off + dest[i].data_size < off) )
257 return GNUNET_SYSERR;
259 dest[i].data = &src[off];
260 off += dest[i].data_size;
261 #if GNUNET_EXTRA_LOGGING
265 str = GNUNET_GNSRECORD_value_to_string (dest[i].record_type,
271 return GNUNET_SYSERR;
276 LOG (GNUNET_ERROR_TYPE_DEBUG,
277 "Deserialized record %u with flags %d and expiration time %llu\n",
280 (unsigned long long) dest[i].expiration_time);
286 /* end of gnsrecord_serialization.c */